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drm/tests: hdmi: Fix memory leaks in drm_display_mode_from_cea_vic()
[drm/drm-misc.git] / drivers / scsi / ibmvscsi / ibmvfc.c
blobe66c3ef74267a5527b21e6e1d13efb91425b158e
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
4 *
5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
6 *
7 * Copyright (C) IBM Corporation, 2008
8 */
9
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/dmapool.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/kthread.h>
18 #include <linux/slab.h>
19 #include <linux/of.h>
20 #include <linux/pm.h>
21 #include <linux/stringify.h>
22 #include <linux/bsg-lib.h>
23 #include <asm/firmware.h>
24 #include <asm/irq.h>
25 #include <asm/vio.h>
26 #include <scsi/scsi.h>
27 #include <scsi/scsi_cmnd.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi_transport_fc.h>
32 #include <scsi/scsi_bsg_fc.h>
33 #include "ibmvfc.h"
34
35 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
36 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
37 static u64 max_lun = IBMVFC_MAX_LUN;
38 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
39 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
40 static u16 max_sectors = IBMVFC_MAX_SECTORS;
41 static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH;
42 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
43 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
44 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
45 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
46 static unsigned int mq_enabled = IBMVFC_MQ;
47 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
48 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
49 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
50 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
51
52 static LIST_HEAD(ibmvfc_head);
53 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
54 static struct scsi_transport_template *ibmvfc_transport_template;
55
56 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
57 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
58 MODULE_LICENSE("GPL");
59 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
60
61 module_param_named(mq, mq_enabled, uint, S_IRUGO);
62 MODULE_PARM_DESC(mq, "Enable multiqueue support. "
63 "[Default=" __stringify(IBMVFC_MQ) "]");
64 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
65 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
66 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
67 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
68 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
69 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
70 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
71 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
72 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
73 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
74 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
75 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
76
77 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
79 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
80 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
81 MODULE_PARM_DESC(default_timeout,
82 "Default timeout in seconds for initialization and EH commands. "
83 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
84 module_param_named(max_requests, max_requests, uint, S_IRUGO);
85 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
86 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
87 module_param_named(max_sectors, max_sectors, ushort, S_IRUGO);
88 MODULE_PARM_DESC(max_sectors, "Maximum sectors for this adapter. "
89 "[Default=" __stringify(IBMVFC_MAX_SECTORS) "]");
90 module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO);
91 MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. "
92 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]");
93 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
94 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
95 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
96 module_param_named(max_targets, max_targets, uint, S_IRUGO);
97 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
98 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
99 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
100 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
101 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
102 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
103 MODULE_PARM_DESC(debug, "Enable driver debug information. "
104 "[Default=" __stringify(IBMVFC_DEBUG) "]");
105 module_param_named(log_level, log_level, uint, 0);
106 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
107 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
108 module_param_named(cls3_error, cls3_error, uint, 0);
109 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
110 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
111
112 static const struct {
113 u16 status;
114 u16 error;
115 u8 result;
116 u8 retry;
117 int log;
118 char *name;
119 } cmd_status [] = {
120 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
121 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
122 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
123 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
124 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
125 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
126 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
127 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
128 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
129 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
130 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
131 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
132 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
133 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
134
135 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
136 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
137 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
138 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
139 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
140 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
141 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
142 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
143 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
144 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
145
146 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
147 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
148 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
149 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
150 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
151 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
152 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
153 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
154 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
155 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
156 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
157
158 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
159 { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
160 };
161
162 static void ibmvfc_npiv_login(struct ibmvfc_host *);
163 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
164 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
165 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
166 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
167 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
168 static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
169
170 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
171 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
172
173 static const char *unknown_error = "unknown error";
174
175 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
176 unsigned long length, unsigned long *cookie,
177 unsigned long *irq)
178 {
179 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
180 long rc;
181
182 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
183 *cookie = retbuf[0];
184 *irq = retbuf[1];
185
186 return rc;
187 }
188
189 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
190 {
191 u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
192
193 return (host_caps & cap_flags) ? 1 : 0;
194 }
195
196 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
197 struct ibmvfc_cmd *vfc_cmd)
198 {
199 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
200 return &vfc_cmd->v2.iu;
201 else
202 return &vfc_cmd->v1.iu;
203 }
204
205 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
206 struct ibmvfc_cmd *vfc_cmd)
207 {
208 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
209 return &vfc_cmd->v2.rsp;
210 else
211 return &vfc_cmd->v1.rsp;
212 }
213
214 #ifdef CONFIG_SCSI_IBMVFC_TRACE
215 /**
216 * ibmvfc_trc_start - Log a start trace entry
217 * @evt: ibmvfc event struct
218 *
219 **/
220 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
221 {
222 struct ibmvfc_host *vhost = evt->vhost;
223 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
224 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
225 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
226 struct ibmvfc_trace_entry *entry;
227 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
228
229 entry = &vhost->trace[index];
230 entry->evt = evt;
231 entry->time = jiffies;
232 entry->fmt = evt->crq.format;
233 entry->type = IBMVFC_TRC_START;
234
235 switch (entry->fmt) {
236 case IBMVFC_CMD_FORMAT:
237 entry->op_code = iu->cdb[0];
238 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
239 entry->lun = scsilun_to_int(&iu->lun);
240 entry->tmf_flags = iu->tmf_flags;
241 entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
242 break;
243 case IBMVFC_MAD_FORMAT:
244 entry->op_code = be32_to_cpu(mad->opcode);
245 break;
246 default:
247 break;
248 }
249 }
250
251 /**
252 * ibmvfc_trc_end - Log an end trace entry
253 * @evt: ibmvfc event struct
254 *
255 **/
256 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
257 {
258 struct ibmvfc_host *vhost = evt->vhost;
259 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
260 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
261 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
262 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
263 struct ibmvfc_trace_entry *entry;
264 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
265
266 entry = &vhost->trace[index];
267 entry->evt = evt;
268 entry->time = jiffies;
269 entry->fmt = evt->crq.format;
270 entry->type = IBMVFC_TRC_END;
271
272 switch (entry->fmt) {
273 case IBMVFC_CMD_FORMAT:
274 entry->op_code = iu->cdb[0];
275 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
276 entry->lun = scsilun_to_int(&iu->lun);
277 entry->tmf_flags = iu->tmf_flags;
278 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
279 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
280 entry->u.end.fcp_rsp_flags = rsp->flags;
281 entry->u.end.rsp_code = rsp->data.info.rsp_code;
282 entry->u.end.scsi_status = rsp->scsi_status;
283 break;
284 case IBMVFC_MAD_FORMAT:
285 entry->op_code = be32_to_cpu(mad->opcode);
286 entry->u.end.status = be16_to_cpu(mad->status);
287 break;
288 default:
289 break;
290
291 }
292 }
293
294 #else
295 #define ibmvfc_trc_start(evt) do { } while (0)
296 #define ibmvfc_trc_end(evt) do { } while (0)
297 #endif
298
299 /**
300 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
301 * @status: status / error class
302 * @error: error
303 *
304 * Return value:
305 * index into cmd_status / -EINVAL on failure
306 **/
307 static int ibmvfc_get_err_index(u16 status, u16 error)
308 {
309 int i;
310
311 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
312 if ((cmd_status[i].status & status) == cmd_status[i].status &&
313 cmd_status[i].error == error)
314 return i;
315
316 return -EINVAL;
317 }
318
319 /**
320 * ibmvfc_get_cmd_error - Find the error description for the fcp response
321 * @status: status / error class
322 * @error: error
323 *
324 * Return value:
325 * error description string
326 **/
327 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
328 {
329 int rc = ibmvfc_get_err_index(status, error);
330 if (rc >= 0)
331 return cmd_status[rc].name;
332 return unknown_error;
333 }
334
335 /**
336 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
337 * @vhost: ibmvfc host struct
338 * @vfc_cmd: ibmvfc command struct
339 *
340 * Return value:
341 * SCSI result value to return for completed command
342 **/
343 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
344 {
345 int err;
346 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
347 int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
348
349 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
350 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
351 rsp->data.info.rsp_code))
352 return DID_ERROR << 16;
353
354 err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
355 if (err >= 0)
356 return rsp->scsi_status | (cmd_status[err].result << 16);
357 return rsp->scsi_status | (DID_ERROR << 16);
358 }
359
360 /**
361 * ibmvfc_retry_cmd - Determine if error status is retryable
362 * @status: status / error class
363 * @error: error
364 *
365 * Return value:
366 * 1 if error should be retried / 0 if it should not
367 **/
368 static int ibmvfc_retry_cmd(u16 status, u16 error)
369 {
370 int rc = ibmvfc_get_err_index(status, error);
371
372 if (rc >= 0)
373 return cmd_status[rc].retry;
374 return 1;
375 }
376
377 static const char *unknown_fc_explain = "unknown fc explain";
378
379 static const struct {
380 u16 fc_explain;
381 char *name;
382 } ls_explain [] = {
383 { 0x00, "no additional explanation" },
384 { 0x01, "service parameter error - options" },
385 { 0x03, "service parameter error - initiator control" },
386 { 0x05, "service parameter error - recipient control" },
387 { 0x07, "service parameter error - received data field size" },
388 { 0x09, "service parameter error - concurrent seq" },
389 { 0x0B, "service parameter error - credit" },
390 { 0x0D, "invalid N_Port/F_Port_Name" },
391 { 0x0E, "invalid node/Fabric Name" },
392 { 0x0F, "invalid common service parameters" },
393 { 0x11, "invalid association header" },
394 { 0x13, "association header required" },
395 { 0x15, "invalid originator S_ID" },
396 { 0x17, "invalid OX_ID-RX-ID combination" },
397 { 0x19, "command (request) already in progress" },
398 { 0x1E, "N_Port Login requested" },
399 { 0x1F, "Invalid N_Port_ID" },
400 };
401
402 static const struct {
403 u16 fc_explain;
404 char *name;
405 } gs_explain [] = {
406 { 0x00, "no additional explanation" },
407 { 0x01, "port identifier not registered" },
408 { 0x02, "port name not registered" },
409 { 0x03, "node name not registered" },
410 { 0x04, "class of service not registered" },
411 { 0x06, "initial process associator not registered" },
412 { 0x07, "FC-4 TYPEs not registered" },
413 { 0x08, "symbolic port name not registered" },
414 { 0x09, "symbolic node name not registered" },
415 { 0x0A, "port type not registered" },
416 { 0xF0, "authorization exception" },
417 { 0xF1, "authentication exception" },
418 { 0xF2, "data base full" },
419 { 0xF3, "data base empty" },
420 { 0xF4, "processing request" },
421 { 0xF5, "unable to verify connection" },
422 { 0xF6, "devices not in a common zone" },
423 };
424
425 /**
426 * ibmvfc_get_ls_explain - Return the FC Explain description text
427 * @status: FC Explain status
428 *
429 * Returns:
430 * error string
431 **/
432 static const char *ibmvfc_get_ls_explain(u16 status)
433 {
434 int i;
435
436 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
437 if (ls_explain[i].fc_explain == status)
438 return ls_explain[i].name;
439
440 return unknown_fc_explain;
441 }
442
443 /**
444 * ibmvfc_get_gs_explain - Return the FC Explain description text
445 * @status: FC Explain status
446 *
447 * Returns:
448 * error string
449 **/
450 static const char *ibmvfc_get_gs_explain(u16 status)
451 {
452 int i;
453
454 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
455 if (gs_explain[i].fc_explain == status)
456 return gs_explain[i].name;
457
458 return unknown_fc_explain;
459 }
460
461 static const struct {
462 enum ibmvfc_fc_type fc_type;
463 char *name;
464 } fc_type [] = {
465 { IBMVFC_FABRIC_REJECT, "fabric reject" },
466 { IBMVFC_PORT_REJECT, "port reject" },
467 { IBMVFC_LS_REJECT, "ELS reject" },
468 { IBMVFC_FABRIC_BUSY, "fabric busy" },
469 { IBMVFC_PORT_BUSY, "port busy" },
470 { IBMVFC_BASIC_REJECT, "basic reject" },
471 };
472
473 static const char *unknown_fc_type = "unknown fc type";
474
475 /**
476 * ibmvfc_get_fc_type - Return the FC Type description text
477 * @status: FC Type error status
478 *
479 * Returns:
480 * error string
481 **/
482 static const char *ibmvfc_get_fc_type(u16 status)
483 {
484 int i;
485
486 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
487 if (fc_type[i].fc_type == status)
488 return fc_type[i].name;
489
490 return unknown_fc_type;
491 }
492
493 /**
494 * ibmvfc_set_tgt_action - Set the next init action for the target
495 * @tgt: ibmvfc target struct
496 * @action: action to perform
497 *
498 * Returns:
499 * 0 if action changed / non-zero if not changed
500 **/
501 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
502 enum ibmvfc_target_action action)
503 {
504 int rc = -EINVAL;
505
506 switch (tgt->action) {
507 case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
508 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
509 action == IBMVFC_TGT_ACTION_DEL_RPORT) {
510 tgt->action = action;
511 rc = 0;
512 }
513 break;
514 case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
515 if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
516 action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
517 tgt->action = action;
518 rc = 0;
519 }
520 break;
521 case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
522 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
523 tgt->action = action;
524 rc = 0;
525 }
526 break;
527 case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
528 if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
529 tgt->action = action;
530 rc = 0;
531 }
532 break;
533 case IBMVFC_TGT_ACTION_DEL_RPORT:
534 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
535 tgt->action = action;
536 rc = 0;
537 }
538 break;
539 case IBMVFC_TGT_ACTION_DELETED_RPORT:
540 break;
541 default:
542 tgt->action = action;
543 rc = 0;
544 break;
545 }
546
547 if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
548 tgt->add_rport = 0;
549
550 return rc;
551 }
552
553 /**
554 * ibmvfc_set_host_state - Set the state for the host
555 * @vhost: ibmvfc host struct
556 * @state: state to set host to
557 *
558 * Returns:
559 * 0 if state changed / non-zero if not changed
560 **/
561 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
562 enum ibmvfc_host_state state)
563 {
564 int rc = 0;
565
566 switch (vhost->state) {
567 case IBMVFC_HOST_OFFLINE:
568 rc = -EINVAL;
569 break;
570 default:
571 vhost->state = state;
572 break;
573 }
574
575 return rc;
576 }
577
578 /**
579 * ibmvfc_set_host_action - Set the next init action for the host
580 * @vhost: ibmvfc host struct
581 * @action: action to perform
582 *
583 **/
584 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
585 enum ibmvfc_host_action action)
586 {
587 switch (action) {
588 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
589 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
590 vhost->action = action;
591 break;
592 case IBMVFC_HOST_ACTION_LOGO_WAIT:
593 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
594 vhost->action = action;
595 break;
596 case IBMVFC_HOST_ACTION_INIT_WAIT:
597 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
598 vhost->action = action;
599 break;
600 case IBMVFC_HOST_ACTION_QUERY:
601 switch (vhost->action) {
602 case IBMVFC_HOST_ACTION_INIT_WAIT:
603 case IBMVFC_HOST_ACTION_NONE:
604 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
605 vhost->action = action;
606 break;
607 default:
608 break;
609 }
610 break;
611 case IBMVFC_HOST_ACTION_TGT_INIT:
612 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
613 vhost->action = action;
614 break;
615 case IBMVFC_HOST_ACTION_REENABLE:
616 case IBMVFC_HOST_ACTION_RESET:
617 vhost->action = action;
618 break;
619 case IBMVFC_HOST_ACTION_INIT:
620 case IBMVFC_HOST_ACTION_TGT_DEL:
621 case IBMVFC_HOST_ACTION_LOGO:
622 case IBMVFC_HOST_ACTION_QUERY_TGTS:
623 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
624 case IBMVFC_HOST_ACTION_NONE:
625 default:
626 switch (vhost->action) {
627 case IBMVFC_HOST_ACTION_RESET:
628 case IBMVFC_HOST_ACTION_REENABLE:
629 break;
630 default:
631 vhost->action = action;
632 break;
633 }
634 break;
635 }
636 }
637
638 /**
639 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
640 * @vhost: ibmvfc host struct
641 *
642 * Return value:
643 * nothing
644 **/
645 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
646 {
647 if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
648 vhost->state == IBMVFC_ACTIVE) {
649 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
650 scsi_block_requests(vhost->host);
651 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
652 }
653 } else
654 vhost->reinit = 1;
655
656 wake_up(&vhost->work_wait_q);
657 }
658
659 /**
660 * ibmvfc_del_tgt - Schedule cleanup and removal of the target
661 * @tgt: ibmvfc target struct
662 **/
663 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
664 {
665 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
666 tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
667 tgt->init_retries = 0;
668 }
669 wake_up(&tgt->vhost->work_wait_q);
670 }
671
672 /**
673 * ibmvfc_link_down - Handle a link down event from the adapter
674 * @vhost: ibmvfc host struct
675 * @state: ibmvfc host state to enter
676 *
677 **/
678 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
679 enum ibmvfc_host_state state)
680 {
681 struct ibmvfc_target *tgt;
682
683 ENTER;
684 scsi_block_requests(vhost->host);
685 list_for_each_entry(tgt, &vhost->targets, queue)
686 ibmvfc_del_tgt(tgt);
687 ibmvfc_set_host_state(vhost, state);
688 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
689 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
690 wake_up(&vhost->work_wait_q);
691 LEAVE;
692 }
693
694 /**
695 * ibmvfc_init_host - Start host initialization
696 * @vhost: ibmvfc host struct
697 *
698 * Return value:
699 * nothing
700 **/
701 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
702 {
703 struct ibmvfc_target *tgt;
704
705 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
706 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
707 dev_err(vhost->dev,
708 "Host initialization retries exceeded. Taking adapter offline\n");
709 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
710 return;
711 }
712 }
713
714 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
715 memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
716 vhost->async_crq.cur = 0;
717
718 list_for_each_entry(tgt, &vhost->targets, queue) {
719 if (vhost->client_migrated)
720 tgt->need_login = 1;
721 else
722 ibmvfc_del_tgt(tgt);
723 }
724
725 scsi_block_requests(vhost->host);
726 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
727 vhost->job_step = ibmvfc_npiv_login;
728 wake_up(&vhost->work_wait_q);
729 }
730 }
731
732 /**
733 * ibmvfc_send_crq - Send a CRQ
734 * @vhost: ibmvfc host struct
735 * @word1: the first 64 bits of the data
736 * @word2: the second 64 bits of the data
737 *
738 * Return value:
739 * 0 on success / other on failure
740 **/
741 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
742 {
743 struct vio_dev *vdev = to_vio_dev(vhost->dev);
744 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
745 }
746
747 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
748 u64 word2, u64 word3, u64 word4)
749 {
750 struct vio_dev *vdev = to_vio_dev(vhost->dev);
751
752 return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
753 word1, word2, word3, word4);
754 }
755
756 /**
757 * ibmvfc_send_crq_init - Send a CRQ init message
758 * @vhost: ibmvfc host struct
759 *
760 * Return value:
761 * 0 on success / other on failure
762 **/
763 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
764 {
765 ibmvfc_dbg(vhost, "Sending CRQ init\n");
766 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
767 }
768
769 /**
770 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
771 * @vhost: ibmvfc host struct
772 *
773 * Return value:
774 * 0 on success / other on failure
775 **/
776 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
777 {
778 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
779 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
780 }
781
782 /**
783 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
784 * @vhost: ibmvfc host who owns the event pool
785 * @queue: ibmvfc queue struct
786 *
787 * Returns zero on success.
788 **/
789 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
790 struct ibmvfc_queue *queue)
791 {
792 int i;
793 struct ibmvfc_event_pool *pool = &queue->evt_pool;
794
795 ENTER;
796 if (!queue->total_depth)
797 return 0;
798
799 pool->size = queue->total_depth;
800 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
801 if (!pool->events)
802 return -ENOMEM;
803
804 pool->iu_storage = dma_alloc_coherent(vhost->dev,
805 pool->size * sizeof(*pool->iu_storage),
806 &pool->iu_token, 0);
807
808 if (!pool->iu_storage) {
809 kfree(pool->events);
810 return -ENOMEM;
811 }
812
813 INIT_LIST_HEAD(&queue->sent);
814 INIT_LIST_HEAD(&queue->free);
815 queue->evt_free = queue->evt_depth;
816 queue->reserved_free = queue->reserved_depth;
817 spin_lock_init(&queue->l_lock);
818
819 for (i = 0; i < pool->size; ++i) {
820 struct ibmvfc_event *evt = &pool->events[i];
821
822 /*
823 * evt->active states
824 * 1 = in flight
825 * 0 = being completed
826 * -1 = free/freed
827 */
828 atomic_set(&evt->active, -1);
829 atomic_set(&evt->free, 1);
830 evt->crq.valid = 0x80;
831 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
832 evt->xfer_iu = pool->iu_storage + i;
833 evt->vhost = vhost;
834 evt->queue = queue;
835 evt->ext_list = NULL;
836 list_add_tail(&evt->queue_list, &queue->free);
837 }
838
839 LEAVE;
840 return 0;
841 }
842
843 /**
844 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
845 * @vhost: ibmvfc host who owns the event pool
846 * @queue: ibmvfc queue struct
847 *
848 **/
849 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
850 struct ibmvfc_queue *queue)
851 {
852 int i;
853 struct ibmvfc_event_pool *pool = &queue->evt_pool;
854
855 ENTER;
856 for (i = 0; i < pool->size; ++i) {
857 list_del(&pool->events[i].queue_list);
858 BUG_ON(atomic_read(&pool->events[i].free) != 1);
859 if (pool->events[i].ext_list)
860 dma_pool_free(vhost->sg_pool,
861 pool->events[i].ext_list,
862 pool->events[i].ext_list_token);
863 }
864
865 kfree(pool->events);
866 dma_free_coherent(vhost->dev,
867 pool->size * sizeof(*pool->iu_storage),
868 pool->iu_storage, pool->iu_token);
869 LEAVE;
870 }
871
872 /**
873 * ibmvfc_free_queue - Deallocate queue
874 * @vhost: ibmvfc host struct
875 * @queue: ibmvfc queue struct
876 *
877 * Unmaps dma and deallocates page for messages
878 **/
879 static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
880 struct ibmvfc_queue *queue)
881 {
882 struct device *dev = vhost->dev;
883
884 dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
885 free_page((unsigned long)queue->msgs.handle);
886 queue->msgs.handle = NULL;
887
888 ibmvfc_free_event_pool(vhost, queue);
889 }
890
891 /**
892 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
893 * @vhost: ibmvfc host struct
894 *
895 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
896 * the crq with the hypervisor.
897 **/
898 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
899 {
900 long rc = 0;
901 struct vio_dev *vdev = to_vio_dev(vhost->dev);
902 struct ibmvfc_queue *crq = &vhost->crq;
903
904 ibmvfc_dbg(vhost, "Releasing CRQ\n");
905 free_irq(vdev->irq, vhost);
906 tasklet_kill(&vhost->tasklet);
907 do {
908 if (rc)
909 msleep(100);
910 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
911 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
912
913 vhost->state = IBMVFC_NO_CRQ;
914 vhost->logged_in = 0;
915
916 ibmvfc_free_queue(vhost, crq);
917 }
918
919 /**
920 * ibmvfc_reenable_crq_queue - reenables the CRQ
921 * @vhost: ibmvfc host struct
922 *
923 * Return value:
924 * 0 on success / other on failure
925 **/
926 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
927 {
928 int rc = 0;
929 struct vio_dev *vdev = to_vio_dev(vhost->dev);
930 unsigned long flags;
931
932 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
933
934 /* Re-enable the CRQ */
935 do {
936 if (rc)
937 msleep(100);
938 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
939 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
940
941 if (rc)
942 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
943
944 spin_lock_irqsave(vhost->host->host_lock, flags);
945 spin_lock(vhost->crq.q_lock);
946 vhost->do_enquiry = 1;
947 vhost->using_channels = 0;
948 spin_unlock(vhost->crq.q_lock);
949 spin_unlock_irqrestore(vhost->host->host_lock, flags);
950
951 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
952
953 return rc;
954 }
955
956 /**
957 * ibmvfc_reset_crq - resets a crq after a failure
958 * @vhost: ibmvfc host struct
959 *
960 * Return value:
961 * 0 on success / other on failure
962 **/
963 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
964 {
965 int rc = 0;
966 unsigned long flags;
967 struct vio_dev *vdev = to_vio_dev(vhost->dev);
968 struct ibmvfc_queue *crq = &vhost->crq;
969
970 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
971
972 /* Close the CRQ */
973 do {
974 if (rc)
975 msleep(100);
976 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
977 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
978
979 spin_lock_irqsave(vhost->host->host_lock, flags);
980 spin_lock(vhost->crq.q_lock);
981 vhost->state = IBMVFC_NO_CRQ;
982 vhost->logged_in = 0;
983 vhost->do_enquiry = 1;
984 vhost->using_channels = 0;
985
986 /* Clean out the queue */
987 memset(crq->msgs.crq, 0, PAGE_SIZE);
988 crq->cur = 0;
989
990 /* And re-open it again */
991 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
992 crq->msg_token, PAGE_SIZE);
993
994 if (rc == H_CLOSED)
995 /* Adapter is good, but other end is not ready */
996 dev_warn(vhost->dev, "Partner adapter not ready\n");
997 else if (rc != 0)
998 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
999
1000 spin_unlock(vhost->crq.q_lock);
1001 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1002
1003 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
1004
1005 return rc;
1006 }
1007
1008 /**
1009 * ibmvfc_valid_event - Determines if event is valid.
1010 * @pool: event_pool that contains the event
1011 * @evt: ibmvfc event to be checked for validity
1012 *
1013 * Return value:
1014 * 1 if event is valid / 0 if event is not valid
1015 **/
1016 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1017 struct ibmvfc_event *evt)
1018 {
1019 int index = evt - pool->events;
1020 if (index < 0 || index >= pool->size) /* outside of bounds */
1021 return 0;
1022 if (evt != pool->events + index) /* unaligned */
1023 return 0;
1024 return 1;
1025 }
1026
1027 /**
1028 * ibmvfc_free_event - Free the specified event
1029 * @evt: ibmvfc_event to be freed
1030 *
1031 **/
1032 static void ibmvfc_free_event(struct ibmvfc_event *evt)
1033 {
1034 struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1035 unsigned long flags;
1036
1037 BUG_ON(!ibmvfc_valid_event(pool, evt));
1038 BUG_ON(atomic_inc_return(&evt->free) != 1);
1039 BUG_ON(atomic_dec_and_test(&evt->active));
1040
1041 spin_lock_irqsave(&evt->queue->l_lock, flags);
1042 list_add_tail(&evt->queue_list, &evt->queue->free);
1043 if (evt->reserved) {
1044 evt->reserved = 0;
1045 evt->queue->reserved_free++;
1046 } else {
1047 evt->queue->evt_free++;
1048 }
1049 if (evt->eh_comp)
1050 complete(evt->eh_comp);
1051 spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1052 }
1053
1054 /**
1055 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1056 * @evt: ibmvfc event struct
1057 *
1058 * This function does not setup any error status, that must be done
1059 * before this function gets called.
1060 **/
1061 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1062 {
1063 struct scsi_cmnd *cmnd = evt->cmnd;
1064
1065 if (cmnd) {
1066 scsi_dma_unmap(cmnd);
1067 scsi_done(cmnd);
1068 }
1069
1070 ibmvfc_free_event(evt);
1071 }
1072
1073 /**
1074 * ibmvfc_complete_purge - Complete failed command list
1075 * @purge_list: list head of failed commands
1076 *
1077 * This function runs completions on commands to fail as a result of a
1078 * host reset or platform migration.
1079 **/
1080 static void ibmvfc_complete_purge(struct list_head *purge_list)
1081 {
1082 struct ibmvfc_event *evt, *pos;
1083
1084 list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1085 list_del(&evt->queue_list);
1086 ibmvfc_trc_end(evt);
1087 evt->done(evt);
1088 }
1089 }
1090
1091 /**
1092 * ibmvfc_fail_request - Fail request with specified error code
1093 * @evt: ibmvfc event struct
1094 * @error_code: error code to fail request with
1095 *
1096 * Return value:
1097 * none
1098 **/
1099 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1100 {
1101 /*
1102 * Anything we are failing should still be active. Otherwise, it
1103 * implies we already got a response for the command and are doing
1104 * something bad like double completing it.
1105 */
1106 BUG_ON(!atomic_dec_and_test(&evt->active));
1107 if (evt->cmnd) {
1108 evt->cmnd->result = (error_code << 16);
1109 evt->done = ibmvfc_scsi_eh_done;
1110 } else
1111 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1112
1113 del_timer(&evt->timer);
1114 }
1115
1116 /**
1117 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1118 * @vhost: ibmvfc host struct
1119 * @error_code: error code to fail requests with
1120 *
1121 * Return value:
1122 * none
1123 **/
1124 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1125 {
1126 struct ibmvfc_event *evt, *pos;
1127 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1128 unsigned long flags;
1129 int hwqs = 0;
1130 int i;
1131
1132 if (vhost->using_channels)
1133 hwqs = vhost->scsi_scrqs.active_queues;
1134
1135 ibmvfc_dbg(vhost, "Purging all requests\n");
1136 spin_lock_irqsave(&vhost->crq.l_lock, flags);
1137 list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1138 ibmvfc_fail_request(evt, error_code);
1139 list_splice_init(&vhost->crq.sent, &vhost->purge);
1140 spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1141
1142 for (i = 0; i < hwqs; i++) {
1143 spin_lock_irqsave(queues[i].q_lock, flags);
1144 spin_lock(&queues[i].l_lock);
1145 list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1146 ibmvfc_fail_request(evt, error_code);
1147 list_splice_init(&queues[i].sent, &vhost->purge);
1148 spin_unlock(&queues[i].l_lock);
1149 spin_unlock_irqrestore(queues[i].q_lock, flags);
1150 }
1151 }
1152
1153 /**
1154 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1155 * @vhost: struct ibmvfc host to reset
1156 **/
1157 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1158 {
1159 ibmvfc_purge_requests(vhost, DID_ERROR);
1160 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1161 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1162 }
1163
1164 /**
1165 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1166 * @vhost: struct ibmvfc host to reset
1167 **/
1168 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1169 {
1170 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1171 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1172 scsi_block_requests(vhost->host);
1173 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1174 vhost->job_step = ibmvfc_npiv_logout;
1175 wake_up(&vhost->work_wait_q);
1176 } else
1177 ibmvfc_hard_reset_host(vhost);
1178 }
1179
1180 /**
1181 * ibmvfc_reset_host - Reset the connection to the server
1182 * @vhost: ibmvfc host struct
1183 **/
1184 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1185 {
1186 unsigned long flags;
1187
1188 spin_lock_irqsave(vhost->host->host_lock, flags);
1189 __ibmvfc_reset_host(vhost);
1190 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1191 }
1192
1193 /**
1194 * ibmvfc_retry_host_init - Retry host initialization if allowed
1195 * @vhost: ibmvfc host struct
1196 *
1197 * Returns: 1 if init will be retried / 0 if not
1198 *
1199 **/
1200 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1201 {
1202 int retry = 0;
1203
1204 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1205 vhost->delay_init = 1;
1206 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1207 dev_err(vhost->dev,
1208 "Host initialization retries exceeded. Taking adapter offline\n");
1209 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1210 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1211 __ibmvfc_reset_host(vhost);
1212 else {
1213 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1214 retry = 1;
1215 }
1216 }
1217
1218 wake_up(&vhost->work_wait_q);
1219 return retry;
1220 }
1221
1222 /**
1223 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1224 * @starget: scsi target struct
1225 *
1226 * Return value:
1227 * ibmvfc_target struct / NULL if not found
1228 **/
1229 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1230 {
1231 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1232 struct ibmvfc_host *vhost = shost_priv(shost);
1233 struct ibmvfc_target *tgt;
1234
1235 list_for_each_entry(tgt, &vhost->targets, queue)
1236 if (tgt->target_id == starget->id) {
1237 kref_get(&tgt->kref);
1238 return tgt;
1239 }
1240 return NULL;
1241 }
1242
1243 /**
1244 * ibmvfc_get_target - Find the specified scsi_target
1245 * @starget: scsi target struct
1246 *
1247 * Return value:
1248 * ibmvfc_target struct / NULL if not found
1249 **/
1250 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1251 {
1252 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1253 struct ibmvfc_target *tgt;
1254 unsigned long flags;
1255
1256 spin_lock_irqsave(shost->host_lock, flags);
1257 tgt = __ibmvfc_get_target(starget);
1258 spin_unlock_irqrestore(shost->host_lock, flags);
1259 return tgt;
1260 }
1261
1262 /**
1263 * ibmvfc_get_host_speed - Get host port speed
1264 * @shost: scsi host struct
1265 *
1266 * Return value:
1267 * none
1268 **/
1269 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1270 {
1271 struct ibmvfc_host *vhost = shost_priv(shost);
1272 unsigned long flags;
1273
1274 spin_lock_irqsave(shost->host_lock, flags);
1275 if (vhost->state == IBMVFC_ACTIVE) {
1276 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1277 case 1:
1278 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1279 break;
1280 case 2:
1281 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1282 break;
1283 case 4:
1284 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1285 break;
1286 case 8:
1287 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1288 break;
1289 case 10:
1290 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1291 break;
1292 case 16:
1293 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1294 break;
1295 default:
1296 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1297 be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1298 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1299 break;
1300 }
1301 } else
1302 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1303 spin_unlock_irqrestore(shost->host_lock, flags);
1304 }
1305
1306 /**
1307 * ibmvfc_get_host_port_state - Get host port state
1308 * @shost: scsi host struct
1309 *
1310 * Return value:
1311 * none
1312 **/
1313 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1314 {
1315 struct ibmvfc_host *vhost = shost_priv(shost);
1316 unsigned long flags;
1317
1318 spin_lock_irqsave(shost->host_lock, flags);
1319 switch (vhost->state) {
1320 case IBMVFC_INITIALIZING:
1321 case IBMVFC_ACTIVE:
1322 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1323 break;
1324 case IBMVFC_LINK_DOWN:
1325 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1326 break;
1327 case IBMVFC_LINK_DEAD:
1328 case IBMVFC_HOST_OFFLINE:
1329 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1330 break;
1331 case IBMVFC_HALTED:
1332 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1333 break;
1334 case IBMVFC_NO_CRQ:
1335 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1336 break;
1337 default:
1338 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1339 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1340 break;
1341 }
1342 spin_unlock_irqrestore(shost->host_lock, flags);
1343 }
1344
1345 /**
1346 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1347 * @rport: rport struct
1348 * @timeout: timeout value
1349 *
1350 * Return value:
1351 * none
1352 **/
1353 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1354 {
1355 if (timeout)
1356 rport->dev_loss_tmo = timeout;
1357 else
1358 rport->dev_loss_tmo = 1;
1359 }
1360
1361 /**
1362 * ibmvfc_release_tgt - Free memory allocated for a target
1363 * @kref: kref struct
1364 *
1365 **/
1366 static void ibmvfc_release_tgt(struct kref *kref)
1367 {
1368 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1369 kfree(tgt);
1370 }
1371
1372 /**
1373 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1374 * @starget: scsi target struct
1375 *
1376 * Return value:
1377 * none
1378 **/
1379 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1380 {
1381 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1382 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1383 if (tgt)
1384 kref_put(&tgt->kref, ibmvfc_release_tgt);
1385 }
1386
1387 /**
1388 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1389 * @starget: scsi target struct
1390 *
1391 * Return value:
1392 * none
1393 **/
1394 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1395 {
1396 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1397 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1398 if (tgt)
1399 kref_put(&tgt->kref, ibmvfc_release_tgt);
1400 }
1401
1402 /**
1403 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1404 * @starget: scsi target struct
1405 *
1406 * Return value:
1407 * none
1408 **/
1409 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1410 {
1411 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1412 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1413 if (tgt)
1414 kref_put(&tgt->kref, ibmvfc_release_tgt);
1415 }
1416
1417 /**
1418 * ibmvfc_wait_while_resetting - Wait while the host resets
1419 * @vhost: ibmvfc host struct
1420 *
1421 * Return value:
1422 * 0 on success / other on failure
1423 **/
1424 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1425 {
1426 long timeout = wait_event_timeout(vhost->init_wait_q,
1427 ((vhost->state == IBMVFC_ACTIVE ||
1428 vhost->state == IBMVFC_HOST_OFFLINE ||
1429 vhost->state == IBMVFC_LINK_DEAD) &&
1430 vhost->action == IBMVFC_HOST_ACTION_NONE),
1431 (init_timeout * HZ));
1432
1433 return timeout ? 0 : -EIO;
1434 }
1435
1436 /**
1437 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1438 * @shost: scsi host struct
1439 *
1440 * Return value:
1441 * 0 on success / other on failure
1442 **/
1443 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1444 {
1445 struct ibmvfc_host *vhost = shost_priv(shost);
1446
1447 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1448 ibmvfc_reset_host(vhost);
1449 return ibmvfc_wait_while_resetting(vhost);
1450 }
1451
1452 /**
1453 * ibmvfc_gather_partition_info - Gather info about the LPAR
1454 * @vhost: ibmvfc host struct
1455 *
1456 * Return value:
1457 * none
1458 **/
1459 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1460 {
1461 struct device_node *rootdn;
1462 const char *name;
1463 const unsigned int *num;
1464
1465 rootdn = of_find_node_by_path("/");
1466 if (!rootdn)
1467 return;
1468
1469 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1470 if (name)
1471 strscpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1472 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1473 if (num)
1474 vhost->partition_number = *num;
1475 of_node_put(rootdn);
1476 }
1477
1478 /**
1479 * ibmvfc_set_login_info - Setup info for NPIV login
1480 * @vhost: ibmvfc host struct
1481 *
1482 * Return value:
1483 * none
1484 **/
1485 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1486 {
1487 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1488 struct ibmvfc_queue *async_crq = &vhost->async_crq;
1489 struct device_node *of_node = vhost->dev->of_node;
1490 const char *location;
1491 u16 max_cmds;
1492
1493 max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
1494 if (mq_enabled)
1495 max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) *
1496 vhost->scsi_scrqs.desired_queues;
1497
1498 memset(login_info, 0, sizeof(*login_info));
1499
1500 login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1501 login_info->max_dma_len = cpu_to_be64(max_sectors << 9);
1502 login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1503 login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1504 login_info->partition_num = cpu_to_be32(vhost->partition_number);
1505 login_info->vfc_frame_version = cpu_to_be32(1);
1506 login_info->fcp_version = cpu_to_be16(3);
1507 login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1508 if (vhost->client_migrated)
1509 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1510
1511 login_info->max_cmds = cpu_to_be32(max_cmds);
1512 login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1513
1514 if (vhost->mq_enabled || vhost->using_channels)
1515 login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1516
1517 login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1518 login_info->async.len = cpu_to_be32(async_crq->size *
1519 sizeof(*async_crq->msgs.async));
1520 strscpy(login_info->partition_name, vhost->partition_name,
1521 sizeof(login_info->partition_name));
1522
1523 strscpy(login_info->device_name,
1524 dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name));
1525
1526 location = of_get_property(of_node, "ibm,loc-code", NULL);
1527 location = location ? location : dev_name(vhost->dev);
1528 strscpy(login_info->drc_name, location, sizeof(login_info->drc_name));
1529 }
1530
1531 /**
1532 * __ibmvfc_get_event - Gets the next free event in pool
1533 * @queue: ibmvfc queue struct
1534 * @reserved: event is for a reserved management command
1535 *
1536 * Returns a free event from the pool.
1537 **/
1538 static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved)
1539 {
1540 struct ibmvfc_event *evt = NULL;
1541 unsigned long flags;
1542
1543 spin_lock_irqsave(&queue->l_lock, flags);
1544 if (reserved && queue->reserved_free) {
1545 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1546 evt->reserved = 1;
1547 queue->reserved_free--;
1548 } else if (queue->evt_free) {
1549 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1550 queue->evt_free--;
1551 } else {
1552 goto out;
1553 }
1554
1555 atomic_set(&evt->free, 0);
1556 list_del(&evt->queue_list);
1557 out:
1558 spin_unlock_irqrestore(&queue->l_lock, flags);
1559 return evt;
1560 }
1561
1562 #define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0)
1563 #define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1)
1564
1565 /**
1566 * ibmvfc_locked_done - Calls evt completion with host_lock held
1567 * @evt: ibmvfc evt to complete
1568 *
1569 * All non-scsi command completion callbacks have the expectation that the
1570 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1571 * MAD evt with the host_lock.
1572 **/
1573 static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1574 {
1575 unsigned long flags;
1576
1577 spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1578 evt->_done(evt);
1579 spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1580 }
1581
1582 /**
1583 * ibmvfc_init_event - Initialize fields in an event struct that are always
1584 * required.
1585 * @evt: The event
1586 * @done: Routine to call when the event is responded to
1587 * @format: SRP or MAD format
1588 **/
1589 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1590 void (*done) (struct ibmvfc_event *), u8 format)
1591 {
1592 evt->cmnd = NULL;
1593 evt->sync_iu = NULL;
1594 evt->eh_comp = NULL;
1595 evt->crq.format = format;
1596 if (format == IBMVFC_CMD_FORMAT)
1597 evt->done = done;
1598 else {
1599 evt->_done = done;
1600 evt->done = ibmvfc_locked_done;
1601 }
1602 evt->hwq = 0;
1603 }
1604
1605 /**
1606 * ibmvfc_map_sg_list - Initialize scatterlist
1607 * @scmd: scsi command struct
1608 * @nseg: number of scatterlist segments
1609 * @md: memory descriptor list to initialize
1610 **/
1611 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1612 struct srp_direct_buf *md)
1613 {
1614 int i;
1615 struct scatterlist *sg;
1616
1617 scsi_for_each_sg(scmd, sg, nseg, i) {
1618 md[i].va = cpu_to_be64(sg_dma_address(sg));
1619 md[i].len = cpu_to_be32(sg_dma_len(sg));
1620 md[i].key = 0;
1621 }
1622 }
1623
1624 /**
1625 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1626 * @scmd: struct scsi_cmnd with the scatterlist
1627 * @evt: ibmvfc event struct
1628 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1629 * @dev: device for which to map dma memory
1630 *
1631 * Returns:
1632 * 0 on success / non-zero on failure
1633 **/
1634 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1635 struct ibmvfc_event *evt,
1636 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1637 {
1638
1639 int sg_mapped;
1640 struct srp_direct_buf *data = &vfc_cmd->ioba;
1641 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1642 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1643
1644 if (cls3_error)
1645 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1646
1647 sg_mapped = scsi_dma_map(scmd);
1648 if (!sg_mapped) {
1649 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1650 return 0;
1651 } else if (unlikely(sg_mapped < 0)) {
1652 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1653 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1654 return sg_mapped;
1655 }
1656
1657 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1658 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1659 iu->add_cdb_len |= IBMVFC_WRDATA;
1660 } else {
1661 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1662 iu->add_cdb_len |= IBMVFC_RDDATA;
1663 }
1664
1665 if (sg_mapped == 1) {
1666 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1667 return 0;
1668 }
1669
1670 vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1671
1672 if (!evt->ext_list) {
1673 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1674 &evt->ext_list_token);
1675
1676 if (!evt->ext_list) {
1677 scsi_dma_unmap(scmd);
1678 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1679 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1680 return -ENOMEM;
1681 }
1682 }
1683
1684 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1685
1686 data->va = cpu_to_be64(evt->ext_list_token);
1687 data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1688 data->key = 0;
1689 return 0;
1690 }
1691
1692 /**
1693 * ibmvfc_timeout - Internal command timeout handler
1694 * @t: struct ibmvfc_event that timed out
1695 *
1696 * Called when an internally generated command times out
1697 **/
1698 static void ibmvfc_timeout(struct timer_list *t)
1699 {
1700 struct ibmvfc_event *evt = from_timer(evt, t, timer);
1701 struct ibmvfc_host *vhost = evt->vhost;
1702 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1703 ibmvfc_reset_host(vhost);
1704 }
1705
1706 /**
1707 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1708 * @evt: event to be sent
1709 * @vhost: ibmvfc host struct
1710 * @timeout: timeout in seconds - 0 means do not time command
1711 *
1712 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1713 **/
1714 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1715 struct ibmvfc_host *vhost, unsigned long timeout)
1716 {
1717 __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1718 unsigned long flags;
1719 int rc;
1720
1721 /* Copy the IU into the transfer area */
1722 *evt->xfer_iu = evt->iu;
1723 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1724 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1725 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1726 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1727 else
1728 BUG();
1729
1730 timer_setup(&evt->timer, ibmvfc_timeout, 0);
1731
1732 if (timeout) {
1733 evt->timer.expires = jiffies + (timeout * HZ);
1734 add_timer(&evt->timer);
1735 }
1736
1737 spin_lock_irqsave(&evt->queue->l_lock, flags);
1738 list_add_tail(&evt->queue_list, &evt->queue->sent);
1739 atomic_set(&evt->active, 1);
1740
1741 mb();
1742
1743 if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1744 rc = ibmvfc_send_sub_crq(vhost,
1745 evt->queue->vios_cookie,
1746 be64_to_cpu(crq_as_u64[0]),
1747 be64_to_cpu(crq_as_u64[1]),
1748 0, 0);
1749 else
1750 rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1751 be64_to_cpu(crq_as_u64[1]));
1752
1753 if (rc) {
1754 atomic_set(&evt->active, 0);
1755 list_del(&evt->queue_list);
1756 spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1757 del_timer(&evt->timer);
1758
1759 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1760 * Firmware will send a CRQ with a transport event (0xFF) to
1761 * tell this client what has happened to the transport. This
1762 * will be handled in ibmvfc_handle_crq()
1763 */
1764 if (rc == H_CLOSED) {
1765 if (printk_ratelimit())
1766 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1767 if (evt->cmnd)
1768 scsi_dma_unmap(evt->cmnd);
1769 ibmvfc_free_event(evt);
1770 return SCSI_MLQUEUE_HOST_BUSY;
1771 }
1772
1773 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1774 if (evt->cmnd) {
1775 evt->cmnd->result = DID_ERROR << 16;
1776 evt->done = ibmvfc_scsi_eh_done;
1777 } else
1778 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1779
1780 evt->done(evt);
1781 } else {
1782 spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1783 ibmvfc_trc_start(evt);
1784 }
1785
1786 return 0;
1787 }
1788
1789 /**
1790 * ibmvfc_log_error - Log an error for the failed command if appropriate
1791 * @evt: ibmvfc event to log
1792 *
1793 **/
1794 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1795 {
1796 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1797 struct ibmvfc_host *vhost = evt->vhost;
1798 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1799 struct scsi_cmnd *cmnd = evt->cmnd;
1800 const char *err = unknown_error;
1801 int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1802 int logerr = 0;
1803 int rsp_code = 0;
1804
1805 if (index >= 0) {
1806 logerr = cmd_status[index].log;
1807 err = cmd_status[index].name;
1808 }
1809
1810 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1811 return;
1812
1813 if (rsp->flags & FCP_RSP_LEN_VALID)
1814 rsp_code = rsp->data.info.rsp_code;
1815
1816 scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1817 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1818 cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1819 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1820 }
1821
1822 /**
1823 * ibmvfc_relogin - Log back into the specified device
1824 * @sdev: scsi device struct
1825 *
1826 **/
1827 static void ibmvfc_relogin(struct scsi_device *sdev)
1828 {
1829 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1830 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1831 struct ibmvfc_target *tgt;
1832 unsigned long flags;
1833
1834 spin_lock_irqsave(vhost->host->host_lock, flags);
1835 list_for_each_entry(tgt, &vhost->targets, queue) {
1836 if (rport == tgt->rport) {
1837 ibmvfc_del_tgt(tgt);
1838 break;
1839 }
1840 }
1841
1842 ibmvfc_reinit_host(vhost);
1843 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1844 }
1845
1846 /**
1847 * ibmvfc_scsi_done - Handle responses from commands
1848 * @evt: ibmvfc event to be handled
1849 *
1850 * Used as a callback when sending scsi cmds.
1851 **/
1852 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1853 {
1854 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1855 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1856 struct scsi_cmnd *cmnd = evt->cmnd;
1857 u32 rsp_len = 0;
1858 u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1859
1860 if (cmnd) {
1861 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1862 scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1863 else if (rsp->flags & FCP_RESID_UNDER)
1864 scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1865 else
1866 scsi_set_resid(cmnd, 0);
1867
1868 if (vfc_cmd->status) {
1869 cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1870
1871 if (rsp->flags & FCP_RSP_LEN_VALID)
1872 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1873 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1874 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1875 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1876 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1877 if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1878 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1879 ibmvfc_relogin(cmnd->device);
1880
1881 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1882 cmnd->result = (DID_ERROR << 16);
1883
1884 ibmvfc_log_error(evt);
1885 }
1886
1887 if (!cmnd->result &&
1888 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1889 cmnd->result = (DID_ERROR << 16);
1890
1891 scsi_dma_unmap(cmnd);
1892 scsi_done(cmnd);
1893 }
1894
1895 ibmvfc_free_event(evt);
1896 }
1897
1898 /**
1899 * ibmvfc_host_chkready - Check if the host can accept commands
1900 * @vhost: struct ibmvfc host
1901 *
1902 * Returns:
1903 * 1 if host can accept command / 0 if not
1904 **/
1905 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1906 {
1907 int result = 0;
1908
1909 switch (vhost->state) {
1910 case IBMVFC_LINK_DEAD:
1911 case IBMVFC_HOST_OFFLINE:
1912 result = DID_NO_CONNECT << 16;
1913 break;
1914 case IBMVFC_NO_CRQ:
1915 case IBMVFC_INITIALIZING:
1916 case IBMVFC_HALTED:
1917 case IBMVFC_LINK_DOWN:
1918 result = DID_REQUEUE << 16;
1919 break;
1920 case IBMVFC_ACTIVE:
1921 result = 0;
1922 break;
1923 }
1924
1925 return result;
1926 }
1927
1928 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1929 {
1930 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1931 struct ibmvfc_host *vhost = evt->vhost;
1932 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1933 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1934 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1935 size_t offset;
1936
1937 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1938 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1939 offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1940 vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1941 } else
1942 offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1943 vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1944 vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1945 vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1946 vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1947 vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1948 vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1949 vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1950 int_to_scsilun(sdev->lun, &iu->lun);
1951
1952 return vfc_cmd;
1953 }
1954
1955 /**
1956 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1957 * @shost: scsi host struct
1958 * @cmnd: struct scsi_cmnd to be executed
1959 *
1960 * Returns:
1961 * 0 on success / other on failure
1962 **/
1963 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1964 {
1965 struct ibmvfc_host *vhost = shost_priv(shost);
1966 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1967 struct ibmvfc_cmd *vfc_cmd;
1968 struct ibmvfc_fcp_cmd_iu *iu;
1969 struct ibmvfc_event *evt;
1970 u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1971 u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1972 u16 scsi_channel;
1973 int rc;
1974
1975 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1976 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1977 cmnd->result = rc;
1978 scsi_done(cmnd);
1979 return 0;
1980 }
1981
1982 cmnd->result = (DID_OK << 16);
1983 if (vhost->using_channels) {
1984 scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1985 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1986 if (!evt)
1987 return SCSI_MLQUEUE_HOST_BUSY;
1988
1989 evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1990 } else {
1991 evt = ibmvfc_get_event(&vhost->crq);
1992 if (!evt)
1993 return SCSI_MLQUEUE_HOST_BUSY;
1994 }
1995
1996 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1997 evt->cmnd = cmnd;
1998
1999 vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
2000 iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
2001
2002 iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
2003 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
2004
2005 if (cmnd->flags & SCMD_TAGGED) {
2006 vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2007 iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2008 }
2009
2010 vfc_cmd->correlation = cpu_to_be64((u64)evt);
2011
2012 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2013 return ibmvfc_send_event(evt, vhost, 0);
2014
2015 ibmvfc_free_event(evt);
2016 if (rc == -ENOMEM)
2017 return SCSI_MLQUEUE_HOST_BUSY;
2018
2019 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2020 scmd_printk(KERN_ERR, cmnd,
2021 "Failed to map DMA buffer for command. rc=%d\n", rc);
2022
2023 cmnd->result = DID_ERROR << 16;
2024 scsi_done(cmnd);
2025 return 0;
2026 }
2027
2028 /**
2029 * ibmvfc_sync_completion - Signal that a synchronous command has completed
2030 * @evt: ibmvfc event struct
2031 *
2032 **/
2033 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2034 {
2035 /* copy the response back */
2036 if (evt->sync_iu)
2037 *evt->sync_iu = *evt->xfer_iu;
2038
2039 complete(&evt->comp);
2040 }
2041
2042 /**
2043 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2044 * @evt: struct ibmvfc_event
2045 *
2046 **/
2047 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2048 {
2049 struct ibmvfc_host *vhost = evt->vhost;
2050
2051 ibmvfc_free_event(evt);
2052 vhost->aborting_passthru = 0;
2053 dev_info(vhost->dev, "Passthru command cancelled\n");
2054 }
2055
2056 /**
2057 * ibmvfc_bsg_timeout - Handle a BSG timeout
2058 * @job: struct bsg_job that timed out
2059 *
2060 * Returns:
2061 * 0 on success / other on failure
2062 **/
2063 static int ibmvfc_bsg_timeout(struct bsg_job *job)
2064 {
2065 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2066 unsigned long port_id = (unsigned long)job->dd_data;
2067 struct ibmvfc_event *evt;
2068 struct ibmvfc_tmf *tmf;
2069 unsigned long flags;
2070 int rc;
2071
2072 ENTER;
2073 spin_lock_irqsave(vhost->host->host_lock, flags);
2074 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2075 __ibmvfc_reset_host(vhost);
2076 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2077 return 0;
2078 }
2079
2080 vhost->aborting_passthru = 1;
2081 evt = ibmvfc_get_reserved_event(&vhost->crq);
2082 if (!evt) {
2083 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2084 return -ENOMEM;
2085 }
2086
2087 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2088
2089 tmf = &evt->iu.tmf;
2090 memset(tmf, 0, sizeof(*tmf));
2091 tmf->common.version = cpu_to_be32(1);
2092 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2093 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2094 tmf->scsi_id = cpu_to_be64(port_id);
2095 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2096 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2097 rc = ibmvfc_send_event(evt, vhost, default_timeout);
2098
2099 if (rc != 0) {
2100 vhost->aborting_passthru = 0;
2101 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2102 rc = -EIO;
2103 } else
2104 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2105 port_id);
2106
2107 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2108
2109 LEAVE;
2110 return rc;
2111 }
2112
2113 /**
2114 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2115 * @vhost: struct ibmvfc_host to send command
2116 * @port_id: port ID to send command
2117 *
2118 * Returns:
2119 * 0 on success / other on failure
2120 **/
2121 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2122 {
2123 struct ibmvfc_port_login *plogi;
2124 struct ibmvfc_target *tgt;
2125 struct ibmvfc_event *evt;
2126 union ibmvfc_iu rsp_iu;
2127 unsigned long flags;
2128 int rc = 0, issue_login = 1;
2129
2130 ENTER;
2131 spin_lock_irqsave(vhost->host->host_lock, flags);
2132 list_for_each_entry(tgt, &vhost->targets, queue) {
2133 if (tgt->scsi_id == port_id) {
2134 issue_login = 0;
2135 break;
2136 }
2137 }
2138
2139 if (!issue_login)
2140 goto unlock_out;
2141 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2142 goto unlock_out;
2143
2144 evt = ibmvfc_get_reserved_event(&vhost->crq);
2145 if (!evt) {
2146 rc = -ENOMEM;
2147 goto unlock_out;
2148 }
2149 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2150 plogi = &evt->iu.plogi;
2151 memset(plogi, 0, sizeof(*plogi));
2152 plogi->common.version = cpu_to_be32(1);
2153 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2154 plogi->common.length = cpu_to_be16(sizeof(*plogi));
2155 plogi->scsi_id = cpu_to_be64(port_id);
2156 evt->sync_iu = &rsp_iu;
2157 init_completion(&evt->comp);
2158
2159 rc = ibmvfc_send_event(evt, vhost, default_timeout);
2160 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2161
2162 if (rc)
2163 return -EIO;
2164
2165 wait_for_completion(&evt->comp);
2166
2167 if (rsp_iu.plogi.common.status)
2168 rc = -EIO;
2169
2170 spin_lock_irqsave(vhost->host->host_lock, flags);
2171 ibmvfc_free_event(evt);
2172 unlock_out:
2173 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2174 LEAVE;
2175 return rc;
2176 }
2177
2178 /**
2179 * ibmvfc_bsg_request - Handle a BSG request
2180 * @job: struct bsg_job to be executed
2181 *
2182 * Returns:
2183 * 0 on success / other on failure
2184 **/
2185 static int ibmvfc_bsg_request(struct bsg_job *job)
2186 {
2187 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2188 struct fc_rport *rport = fc_bsg_to_rport(job);
2189 struct ibmvfc_passthru_mad *mad;
2190 struct ibmvfc_event *evt;
2191 union ibmvfc_iu rsp_iu;
2192 unsigned long flags, port_id = -1;
2193 struct fc_bsg_request *bsg_request = job->request;
2194 struct fc_bsg_reply *bsg_reply = job->reply;
2195 unsigned int code = bsg_request->msgcode;
2196 int rc = 0, req_seg, rsp_seg, issue_login = 0;
2197 u32 fc_flags, rsp_len;
2198
2199 ENTER;
2200 bsg_reply->reply_payload_rcv_len = 0;
2201 if (rport)
2202 port_id = rport->port_id;
2203
2204 switch (code) {
2205 case FC_BSG_HST_ELS_NOLOGIN:
2206 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2207 (bsg_request->rqst_data.h_els.port_id[1] << 8) |
2208 bsg_request->rqst_data.h_els.port_id[2];
2209 fallthrough;
2210 case FC_BSG_RPT_ELS:
2211 fc_flags = IBMVFC_FC_ELS;
2212 break;
2213 case FC_BSG_HST_CT:
2214 issue_login = 1;
2215 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2216 (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2217 bsg_request->rqst_data.h_ct.port_id[2];
2218 fallthrough;
2219 case FC_BSG_RPT_CT:
2220 fc_flags = IBMVFC_FC_CT_IU;
2221 break;
2222 default:
2223 return -ENOTSUPP;
2224 }
2225
2226 if (port_id == -1)
2227 return -EINVAL;
2228 if (!mutex_trylock(&vhost->passthru_mutex))
2229 return -EBUSY;
2230
2231 job->dd_data = (void *)port_id;
2232 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2233 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2234
2235 if (!req_seg) {
2236 mutex_unlock(&vhost->passthru_mutex);
2237 return -ENOMEM;
2238 }
2239
2240 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2241 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2242
2243 if (!rsp_seg) {
2244 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2245 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2246 mutex_unlock(&vhost->passthru_mutex);
2247 return -ENOMEM;
2248 }
2249
2250 if (req_seg > 1 || rsp_seg > 1) {
2251 rc = -EINVAL;
2252 goto out;
2253 }
2254
2255 if (issue_login)
2256 rc = ibmvfc_bsg_plogi(vhost, port_id);
2257
2258 spin_lock_irqsave(vhost->host->host_lock, flags);
2259
2260 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2261 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2262 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2263 goto out;
2264 }
2265
2266 evt = ibmvfc_get_reserved_event(&vhost->crq);
2267 if (!evt) {
2268 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2269 rc = -ENOMEM;
2270 goto out;
2271 }
2272 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2273 mad = &evt->iu.passthru;
2274
2275 memset(mad, 0, sizeof(*mad));
2276 mad->common.version = cpu_to_be32(1);
2277 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2278 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2279
2280 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2281 offsetof(struct ibmvfc_passthru_mad, iu));
2282 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2283
2284 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2285 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2286 mad->iu.flags = cpu_to_be32(fc_flags);
2287 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2288
2289 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2290 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2291 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2292 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2293 mad->iu.scsi_id = cpu_to_be64(port_id);
2294 mad->iu.tag = cpu_to_be64((u64)evt);
2295 rsp_len = be32_to_cpu(mad->iu.rsp.len);
2296
2297 evt->sync_iu = &rsp_iu;
2298 init_completion(&evt->comp);
2299 rc = ibmvfc_send_event(evt, vhost, 0);
2300 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2301
2302 if (rc) {
2303 rc = -EIO;
2304 goto out;
2305 }
2306
2307 wait_for_completion(&evt->comp);
2308
2309 if (rsp_iu.passthru.common.status)
2310 rc = -EIO;
2311 else
2312 bsg_reply->reply_payload_rcv_len = rsp_len;
2313
2314 spin_lock_irqsave(vhost->host->host_lock, flags);
2315 ibmvfc_free_event(evt);
2316 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2317 bsg_reply->result = rc;
2318 bsg_job_done(job, bsg_reply->result,
2319 bsg_reply->reply_payload_rcv_len);
2320 rc = 0;
2321 out:
2322 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2323 job->request_payload.sg_cnt, DMA_TO_DEVICE);
2324 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2325 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2326 mutex_unlock(&vhost->passthru_mutex);
2327 LEAVE;
2328 return rc;
2329 }
2330
2331 /**
2332 * ibmvfc_reset_device - Reset the device with the specified reset type
2333 * @sdev: scsi device to reset
2334 * @type: reset type
2335 * @desc: reset type description for log messages
2336 *
2337 * Returns:
2338 * 0 on success / other on failure
2339 **/
2340 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2341 {
2342 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2343 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2344 struct ibmvfc_cmd *tmf;
2345 struct ibmvfc_event *evt = NULL;
2346 union ibmvfc_iu rsp_iu;
2347 struct ibmvfc_fcp_cmd_iu *iu;
2348 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2349 int rsp_rc = -EBUSY;
2350 unsigned long flags;
2351 int rsp_code = 0;
2352
2353 spin_lock_irqsave(vhost->host->host_lock, flags);
2354 if (vhost->state == IBMVFC_ACTIVE) {
2355 if (vhost->using_channels)
2356 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2357 else
2358 evt = ibmvfc_get_event(&vhost->crq);
2359
2360 if (!evt) {
2361 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2362 return -ENOMEM;
2363 }
2364
2365 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2366 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2367 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2368
2369 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2370 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2371 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2372 iu->tmf_flags = type;
2373 evt->sync_iu = &rsp_iu;
2374
2375 init_completion(&evt->comp);
2376 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2377 }
2378 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2379
2380 if (rsp_rc != 0) {
2381 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2382 desc, rsp_rc);
2383 return -EIO;
2384 }
2385
2386 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2387 wait_for_completion(&evt->comp);
2388
2389 if (rsp_iu.cmd.status)
2390 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2391
2392 if (rsp_code) {
2393 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2394 rsp_code = fc_rsp->data.info.rsp_code;
2395
2396 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2397 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2398 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2399 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2400 fc_rsp->scsi_status);
2401 rsp_rc = -EIO;
2402 } else
2403 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2404
2405 spin_lock_irqsave(vhost->host->host_lock, flags);
2406 ibmvfc_free_event(evt);
2407 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2408 return rsp_rc;
2409 }
2410
2411 /**
2412 * ibmvfc_match_rport - Match function for specified remote port
2413 * @evt: ibmvfc event struct
2414 * @rport: device to match
2415 *
2416 * Returns:
2417 * 1 if event matches rport / 0 if event does not match rport
2418 **/
2419 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2420 {
2421 struct fc_rport *cmd_rport;
2422
2423 if (evt->cmnd) {
2424 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2425 if (cmd_rport == rport)
2426 return 1;
2427 }
2428 return 0;
2429 }
2430
2431 /**
2432 * ibmvfc_match_target - Match function for specified target
2433 * @evt: ibmvfc event struct
2434 * @device: device to match (starget)
2435 *
2436 * Returns:
2437 * 1 if event matches starget / 0 if event does not match starget
2438 **/
2439 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2440 {
2441 if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2442 return 1;
2443 return 0;
2444 }
2445
2446 /**
2447 * ibmvfc_match_lun - Match function for specified LUN
2448 * @evt: ibmvfc event struct
2449 * @device: device to match (sdev)
2450 *
2451 * Returns:
2452 * 1 if event matches sdev / 0 if event does not match sdev
2453 **/
2454 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2455 {
2456 if (evt->cmnd && evt->cmnd->device == device)
2457 return 1;
2458 return 0;
2459 }
2460
2461 /**
2462 * ibmvfc_event_is_free - Check if event is free or not
2463 * @evt: ibmvfc event struct
2464 *
2465 * Returns:
2466 * true / false
2467 **/
2468 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2469 {
2470 struct ibmvfc_event *loop_evt;
2471
2472 list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2473 if (loop_evt == evt)
2474 return true;
2475
2476 return false;
2477 }
2478
2479 /**
2480 * ibmvfc_wait_for_ops - Wait for ops to complete
2481 * @vhost: ibmvfc host struct
2482 * @device: device to match (starget or sdev)
2483 * @match: match function
2484 *
2485 * Returns:
2486 * SUCCESS / FAILED
2487 **/
2488 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2489 int (*match) (struct ibmvfc_event *, void *))
2490 {
2491 struct ibmvfc_event *evt;
2492 DECLARE_COMPLETION_ONSTACK(comp);
2493 int wait, i, q_index, q_size;
2494 unsigned long flags;
2495 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2496 struct ibmvfc_queue *queues;
2497
2498 ENTER;
2499 if (vhost->mq_enabled && vhost->using_channels) {
2500 queues = vhost->scsi_scrqs.scrqs;
2501 q_size = vhost->scsi_scrqs.active_queues;
2502 } else {
2503 queues = &vhost->crq;
2504 q_size = 1;
2505 }
2506
2507 do {
2508 wait = 0;
2509 spin_lock_irqsave(vhost->host->host_lock, flags);
2510 for (q_index = 0; q_index < q_size; q_index++) {
2511 spin_lock(&queues[q_index].l_lock);
2512 for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2513 evt = &queues[q_index].evt_pool.events[i];
2514 if (!ibmvfc_event_is_free(evt)) {
2515 if (match(evt, device)) {
2516 evt->eh_comp = &comp;
2517 wait++;
2518 }
2519 }
2520 }
2521 spin_unlock(&queues[q_index].l_lock);
2522 }
2523 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2524
2525 if (wait) {
2526 timeout = wait_for_completion_timeout(&comp, timeout);
2527
2528 if (!timeout) {
2529 wait = 0;
2530 spin_lock_irqsave(vhost->host->host_lock, flags);
2531 for (q_index = 0; q_index < q_size; q_index++) {
2532 spin_lock(&queues[q_index].l_lock);
2533 for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2534 evt = &queues[q_index].evt_pool.events[i];
2535 if (!ibmvfc_event_is_free(evt)) {
2536 if (match(evt, device)) {
2537 evt->eh_comp = NULL;
2538 wait++;
2539 }
2540 }
2541 }
2542 spin_unlock(&queues[q_index].l_lock);
2543 }
2544 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2545 if (wait)
2546 dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2547 LEAVE;
2548 return wait ? FAILED : SUCCESS;
2549 }
2550 }
2551 } while (wait);
2552
2553 LEAVE;
2554 return SUCCESS;
2555 }
2556
2557 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2558 struct scsi_device *sdev,
2559 int type)
2560 {
2561 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2562 struct scsi_target *starget = scsi_target(sdev);
2563 struct fc_rport *rport = starget_to_rport(starget);
2564 struct ibmvfc_event *evt;
2565 struct ibmvfc_tmf *tmf;
2566
2567 evt = ibmvfc_get_reserved_event(queue);
2568 if (!evt)
2569 return NULL;
2570 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2571
2572 tmf = &evt->iu.tmf;
2573 memset(tmf, 0, sizeof(*tmf));
2574 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2575 tmf->common.version = cpu_to_be32(2);
2576 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2577 } else {
2578 tmf->common.version = cpu_to_be32(1);
2579 }
2580 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2581 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2582 tmf->scsi_id = cpu_to_be64(rport->port_id);
2583 int_to_scsilun(sdev->lun, &tmf->lun);
2584 if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2585 type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2586 if (vhost->state == IBMVFC_ACTIVE)
2587 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2588 else
2589 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2590 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2591 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2592
2593 init_completion(&evt->comp);
2594
2595 return evt;
2596 }
2597
2598 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2599 {
2600 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2601 struct ibmvfc_event *evt, *found_evt, *temp;
2602 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2603 unsigned long flags;
2604 int num_hwq, i;
2605 int fail = 0;
2606 LIST_HEAD(cancelq);
2607 u16 status;
2608
2609 ENTER;
2610 spin_lock_irqsave(vhost->host->host_lock, flags);
2611 num_hwq = vhost->scsi_scrqs.active_queues;
2612 for (i = 0; i < num_hwq; i++) {
2613 spin_lock(queues[i].q_lock);
2614 spin_lock(&queues[i].l_lock);
2615 found_evt = NULL;
2616 list_for_each_entry(evt, &queues[i].sent, queue_list) {
2617 if (evt->cmnd && evt->cmnd->device == sdev) {
2618 found_evt = evt;
2619 break;
2620 }
2621 }
2622 spin_unlock(&queues[i].l_lock);
2623
2624 if (found_evt && vhost->logged_in) {
2625 evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2626 if (!evt) {
2627 spin_unlock(queues[i].q_lock);
2628 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2629 return -ENOMEM;
2630 }
2631 evt->sync_iu = &queues[i].cancel_rsp;
2632 ibmvfc_send_event(evt, vhost, default_timeout);
2633 list_add_tail(&evt->cancel, &cancelq);
2634 }
2635
2636 spin_unlock(queues[i].q_lock);
2637 }
2638 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2639
2640 if (list_empty(&cancelq)) {
2641 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2642 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2643 return 0;
2644 }
2645
2646 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2647
2648 list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2649 wait_for_completion(&evt->comp);
2650 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2651 list_del(&evt->cancel);
2652 ibmvfc_free_event(evt);
2653
2654 if (status != IBMVFC_MAD_SUCCESS) {
2655 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2656 switch (status) {
2657 case IBMVFC_MAD_DRIVER_FAILED:
2658 case IBMVFC_MAD_CRQ_ERROR:
2659 /* Host adapter most likely going through reset, return success to
2660 * the caller will wait for the command being cancelled to get returned
2661 */
2662 break;
2663 default:
2664 fail = 1;
2665 break;
2666 }
2667 }
2668 }
2669
2670 if (fail)
2671 return -EIO;
2672
2673 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2674 LEAVE;
2675 return 0;
2676 }
2677
2678 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2679 {
2680 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2681 struct ibmvfc_event *evt, *found_evt;
2682 union ibmvfc_iu rsp;
2683 int rsp_rc = -EBUSY;
2684 unsigned long flags;
2685 u16 status;
2686
2687 ENTER;
2688 found_evt = NULL;
2689 spin_lock_irqsave(vhost->host->host_lock, flags);
2690 spin_lock(&vhost->crq.l_lock);
2691 list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2692 if (evt->cmnd && evt->cmnd->device == sdev) {
2693 found_evt = evt;
2694 break;
2695 }
2696 }
2697 spin_unlock(&vhost->crq.l_lock);
2698
2699 if (!found_evt) {
2700 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2701 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2702 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2703 return 0;
2704 }
2705
2706 if (vhost->logged_in) {
2707 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2708 evt->sync_iu = &rsp;
2709 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2710 }
2711
2712 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2713
2714 if (rsp_rc != 0) {
2715 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2716 /* If failure is received, the host adapter is most likely going
2717 through reset, return success so the caller will wait for the command
2718 being cancelled to get returned */
2719 return 0;
2720 }
2721
2722 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2723
2724 wait_for_completion(&evt->comp);
2725 status = be16_to_cpu(rsp.mad_common.status);
2726 spin_lock_irqsave(vhost->host->host_lock, flags);
2727 ibmvfc_free_event(evt);
2728 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2729
2730 if (status != IBMVFC_MAD_SUCCESS) {
2731 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2732 switch (status) {
2733 case IBMVFC_MAD_DRIVER_FAILED:
2734 case IBMVFC_MAD_CRQ_ERROR:
2735 /* Host adapter most likely going through reset, return success to
2736 the caller will wait for the command being cancelled to get returned */
2737 return 0;
2738 default:
2739 return -EIO;
2740 };
2741 }
2742
2743 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2744 return 0;
2745 }
2746
2747 /**
2748 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2749 * @sdev: scsi device to cancel commands
2750 * @type: type of error recovery being performed
2751 *
2752 * This sends a cancel to the VIOS for the specified device. This does
2753 * NOT send any abort to the actual device. That must be done separately.
2754 *
2755 * Returns:
2756 * 0 on success / other on failure
2757 **/
2758 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2759 {
2760 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2761
2762 if (vhost->mq_enabled && vhost->using_channels)
2763 return ibmvfc_cancel_all_mq(sdev, type);
2764 else
2765 return ibmvfc_cancel_all_sq(sdev, type);
2766 }
2767
2768 /**
2769 * ibmvfc_match_key - Match function for specified cancel key
2770 * @evt: ibmvfc event struct
2771 * @key: cancel key to match
2772 *
2773 * Returns:
2774 * 1 if event matches key / 0 if event does not match key
2775 **/
2776 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2777 {
2778 unsigned long cancel_key = (unsigned long)key;
2779
2780 if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2781 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2782 return 1;
2783 return 0;
2784 }
2785
2786 /**
2787 * ibmvfc_match_evt - Match function for specified event
2788 * @evt: ibmvfc event struct
2789 * @match: event to match
2790 *
2791 * Returns:
2792 * 1 if event matches key / 0 if event does not match key
2793 **/
2794 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2795 {
2796 if (evt == match)
2797 return 1;
2798 return 0;
2799 }
2800
2801 /**
2802 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2803 * @sdev: scsi device to abort commands
2804 *
2805 * This sends an Abort Task Set to the VIOS for the specified device. This does
2806 * NOT send any cancel to the VIOS. That must be done separately.
2807 *
2808 * Returns:
2809 * 0 on success / other on failure
2810 **/
2811 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2812 {
2813 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2814 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2815 struct ibmvfc_cmd *tmf;
2816 struct ibmvfc_event *evt, *found_evt;
2817 union ibmvfc_iu rsp_iu;
2818 struct ibmvfc_fcp_cmd_iu *iu;
2819 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2820 int rc, rsp_rc = -EBUSY;
2821 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2822 int rsp_code = 0;
2823
2824 found_evt = NULL;
2825 spin_lock_irqsave(vhost->host->host_lock, flags);
2826 spin_lock(&vhost->crq.l_lock);
2827 list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2828 if (evt->cmnd && evt->cmnd->device == sdev) {
2829 found_evt = evt;
2830 break;
2831 }
2832 }
2833 spin_unlock(&vhost->crq.l_lock);
2834
2835 if (!found_evt) {
2836 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2837 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2838 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2839 return 0;
2840 }
2841
2842 if (vhost->state == IBMVFC_ACTIVE) {
2843 evt = ibmvfc_get_event(&vhost->crq);
2844 if (!evt) {
2845 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2846 return -ENOMEM;
2847 }
2848 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2849 tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2850 iu = ibmvfc_get_fcp_iu(vhost, tmf);
2851
2852 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2853 tmf->target_wwpn = cpu_to_be64(rport->port_name);
2854 iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2855 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2856 evt->sync_iu = &rsp_iu;
2857
2858 tmf->correlation = cpu_to_be64((u64)evt);
2859
2860 init_completion(&evt->comp);
2861 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2862 }
2863
2864 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2865
2866 if (rsp_rc != 0) {
2867 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2868 return -EIO;
2869 }
2870
2871 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2872 timeout = wait_for_completion_timeout(&evt->comp, timeout);
2873
2874 if (!timeout) {
2875 rc = ibmvfc_cancel_all(sdev, 0);
2876 if (!rc) {
2877 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2878 if (rc == SUCCESS)
2879 rc = 0;
2880 }
2881
2882 if (rc) {
2883 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2884 ibmvfc_reset_host(vhost);
2885 rsp_rc = -EIO;
2886 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2887
2888 if (rc == SUCCESS)
2889 rsp_rc = 0;
2890
2891 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2892 if (rc != SUCCESS) {
2893 spin_lock_irqsave(vhost->host->host_lock, flags);
2894 ibmvfc_hard_reset_host(vhost);
2895 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2896 rsp_rc = 0;
2897 }
2898
2899 goto out;
2900 }
2901 }
2902
2903 if (rsp_iu.cmd.status)
2904 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2905
2906 if (rsp_code) {
2907 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2908 rsp_code = fc_rsp->data.info.rsp_code;
2909
2910 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2911 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2912 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2913 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2914 fc_rsp->scsi_status);
2915 rsp_rc = -EIO;
2916 } else
2917 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2918
2919 out:
2920 spin_lock_irqsave(vhost->host->host_lock, flags);
2921 ibmvfc_free_event(evt);
2922 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2923 return rsp_rc;
2924 }
2925
2926 /**
2927 * ibmvfc_eh_abort_handler - Abort a command
2928 * @cmd: scsi command to abort
2929 *
2930 * Returns:
2931 * SUCCESS / FAST_IO_FAIL / FAILED
2932 **/
2933 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2934 {
2935 struct scsi_device *sdev = cmd->device;
2936 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2937 int cancel_rc, block_rc;
2938 int rc = FAILED;
2939
2940 ENTER;
2941 block_rc = fc_block_scsi_eh(cmd);
2942 ibmvfc_wait_while_resetting(vhost);
2943 if (block_rc != FAST_IO_FAIL) {
2944 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2945 ibmvfc_abort_task_set(sdev);
2946 } else
2947 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2948
2949 if (!cancel_rc)
2950 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2951
2952 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2953 rc = FAST_IO_FAIL;
2954
2955 LEAVE;
2956 return rc;
2957 }
2958
2959 /**
2960 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2961 * @cmd: scsi command struct
2962 *
2963 * Returns:
2964 * SUCCESS / FAST_IO_FAIL / FAILED
2965 **/
2966 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2967 {
2968 struct scsi_device *sdev = cmd->device;
2969 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2970 int cancel_rc, block_rc, reset_rc = 0;
2971 int rc = FAILED;
2972
2973 ENTER;
2974 block_rc = fc_block_scsi_eh(cmd);
2975 ibmvfc_wait_while_resetting(vhost);
2976 if (block_rc != FAST_IO_FAIL) {
2977 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2978 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2979 } else
2980 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2981
2982 if (!cancel_rc && !reset_rc)
2983 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2984
2985 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2986 rc = FAST_IO_FAIL;
2987
2988 LEAVE;
2989 return rc;
2990 }
2991
2992 /**
2993 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2994 * @sdev: scsi device struct
2995 * @data: return code
2996 *
2997 **/
2998 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2999 {
3000 unsigned long *rc = data;
3001 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3002 }
3003
3004 /**
3005 * ibmvfc_eh_target_reset_handler - Reset the target
3006 * @cmd: scsi command struct
3007 *
3008 * Returns:
3009 * SUCCESS / FAST_IO_FAIL / FAILED
3010 **/
3011 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3012 {
3013 struct scsi_target *starget = scsi_target(cmd->device);
3014 struct fc_rport *rport = starget_to_rport(starget);
3015 struct Scsi_Host *shost = rport_to_shost(rport);
3016 struct ibmvfc_host *vhost = shost_priv(shost);
3017 int block_rc;
3018 int reset_rc = 0;
3019 int rc = FAILED;
3020 unsigned long cancel_rc = 0;
3021 bool tgt_reset = false;
3022
3023 ENTER;
3024 block_rc = fc_block_rport(rport);
3025 ibmvfc_wait_while_resetting(vhost);
3026 if (block_rc != FAST_IO_FAIL) {
3027 struct scsi_device *sdev;
3028
3029 shost_for_each_device(sdev, shost) {
3030 if ((sdev->channel != starget->channel) ||
3031 (sdev->id != starget->id))
3032 continue;
3033
3034 cancel_rc |= ibmvfc_cancel_all(sdev,
3035 IBMVFC_TMF_TGT_RESET);
3036 if (!tgt_reset) {
3037 reset_rc = ibmvfc_reset_device(sdev,
3038 IBMVFC_TARGET_RESET, "target");
3039 tgt_reset = true;
3040 }
3041 }
3042 } else
3043 starget_for_each_device(starget, &cancel_rc,
3044 ibmvfc_dev_cancel_all_noreset);
3045
3046 if (!cancel_rc && !reset_rc)
3047 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
3048
3049 if (block_rc == FAST_IO_FAIL && rc != FAILED)
3050 rc = FAST_IO_FAIL;
3051
3052 LEAVE;
3053 return rc;
3054 }
3055
3056 /**
3057 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
3058 * @cmd: struct scsi_cmnd having problems
3059 *
3060 **/
3061 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3062 {
3063 int rc;
3064 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
3065
3066 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3067 rc = ibmvfc_issue_fc_host_lip(vhost->host);
3068
3069 return rc ? FAILED : SUCCESS;
3070 }
3071
3072 /**
3073 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3074 * @rport: rport struct
3075 *
3076 * Return value:
3077 * none
3078 **/
3079 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3080 {
3081 struct Scsi_Host *shost = rport_to_shost(rport);
3082 struct ibmvfc_host *vhost = shost_priv(shost);
3083 struct fc_rport *dev_rport;
3084 struct scsi_device *sdev;
3085 struct ibmvfc_target *tgt;
3086 unsigned long rc, flags;
3087 unsigned int found;
3088
3089 ENTER;
3090 shost_for_each_device(sdev, shost) {
3091 dev_rport = starget_to_rport(scsi_target(sdev));
3092 if (dev_rport != rport)
3093 continue;
3094 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3095 }
3096
3097 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3098
3099 if (rc == FAILED)
3100 ibmvfc_issue_fc_host_lip(shost);
3101
3102 spin_lock_irqsave(shost->host_lock, flags);
3103 found = 0;
3104 list_for_each_entry(tgt, &vhost->targets, queue) {
3105 if (tgt->scsi_id == rport->port_id) {
3106 found++;
3107 break;
3108 }
3109 }
3110
3111 if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3112 /*
3113 * If we get here, that means we previously attempted to send
3114 * an implicit logout to the target but it failed, most likely
3115 * due to I/O being pending, so we need to send it again
3116 */
3117 ibmvfc_del_tgt(tgt);
3118 ibmvfc_reinit_host(vhost);
3119 }
3120
3121 spin_unlock_irqrestore(shost->host_lock, flags);
3122 LEAVE;
3123 }
3124
3125 static const struct ibmvfc_async_desc ae_desc [] = {
3126 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3127 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3128 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3129 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3130 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3131 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
3132 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
3133 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
3134 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
3135 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
3136 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
3137 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
3138 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3139 };
3140
3141 static const struct ibmvfc_async_desc unknown_ae = {
3142 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3143 };
3144
3145 /**
3146 * ibmvfc_get_ae_desc - Get text description for async event
3147 * @ae: async event
3148 *
3149 **/
3150 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3151 {
3152 int i;
3153
3154 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3155 if (ae_desc[i].ae == ae)
3156 return &ae_desc[i];
3157
3158 return &unknown_ae;
3159 }
3160
3161 static const struct {
3162 enum ibmvfc_ae_link_state state;
3163 const char *desc;
3164 } link_desc [] = {
3165 { IBMVFC_AE_LS_LINK_UP, " link up" },
3166 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
3167 { IBMVFC_AE_LS_LINK_DOWN, " link down" },
3168 { IBMVFC_AE_LS_LINK_DEAD, " link dead" },
3169 };
3170
3171 /**
3172 * ibmvfc_get_link_state - Get text description for link state
3173 * @state: link state
3174 *
3175 **/
3176 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3177 {
3178 int i;
3179
3180 for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3181 if (link_desc[i].state == state)
3182 return link_desc[i].desc;
3183
3184 return "";
3185 }
3186
3187 /**
3188 * ibmvfc_handle_async - Handle an async event from the adapter
3189 * @crq: crq to process
3190 * @vhost: ibmvfc host struct
3191 *
3192 **/
3193 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3194 struct ibmvfc_host *vhost)
3195 {
3196 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3197 struct ibmvfc_target *tgt;
3198
3199 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3200 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3201 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3202 ibmvfc_get_link_state(crq->link_state));
3203
3204 switch (be64_to_cpu(crq->event)) {
3205 case IBMVFC_AE_RESUME:
3206 switch (crq->link_state) {
3207 case IBMVFC_AE_LS_LINK_DOWN:
3208 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3209 break;
3210 case IBMVFC_AE_LS_LINK_DEAD:
3211 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3212 break;
3213 case IBMVFC_AE_LS_LINK_UP:
3214 case IBMVFC_AE_LS_LINK_BOUNCED:
3215 default:
3216 vhost->events_to_log |= IBMVFC_AE_LINKUP;
3217 vhost->delay_init = 1;
3218 __ibmvfc_reset_host(vhost);
3219 break;
3220 }
3221
3222 break;
3223 case IBMVFC_AE_LINK_UP:
3224 vhost->events_to_log |= IBMVFC_AE_LINKUP;
3225 vhost->delay_init = 1;
3226 __ibmvfc_reset_host(vhost);
3227 break;
3228 case IBMVFC_AE_SCN_FABRIC:
3229 case IBMVFC_AE_SCN_DOMAIN:
3230 vhost->events_to_log |= IBMVFC_AE_RSCN;
3231 if (vhost->state < IBMVFC_HALTED) {
3232 vhost->delay_init = 1;
3233 __ibmvfc_reset_host(vhost);
3234 }
3235 break;
3236 case IBMVFC_AE_SCN_NPORT:
3237 case IBMVFC_AE_SCN_GROUP:
3238 vhost->events_to_log |= IBMVFC_AE_RSCN;
3239 ibmvfc_reinit_host(vhost);
3240 break;
3241 case IBMVFC_AE_ELS_LOGO:
3242 case IBMVFC_AE_ELS_PRLO:
3243 case IBMVFC_AE_ELS_PLOGI:
3244 list_for_each_entry(tgt, &vhost->targets, queue) {
3245 if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3246 break;
3247 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3248 continue;
3249 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3250 continue;
3251 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3252 continue;
3253 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3254 tgt->logo_rcvd = 1;
3255 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3256 ibmvfc_del_tgt(tgt);
3257 ibmvfc_reinit_host(vhost);
3258 }
3259 }
3260 break;
3261 case IBMVFC_AE_LINK_DOWN:
3262 case IBMVFC_AE_ADAPTER_FAILED:
3263 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3264 break;
3265 case IBMVFC_AE_LINK_DEAD:
3266 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3267 break;
3268 case IBMVFC_AE_HALT:
3269 ibmvfc_link_down(vhost, IBMVFC_HALTED);
3270 break;
3271 default:
3272 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3273 break;
3274 }
3275 }
3276
3277 /**
3278 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3279 * @crq: Command/Response queue
3280 * @vhost: ibmvfc host struct
3281 * @evt_doneq: Event done queue
3282 *
3283 **/
3284 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3285 struct list_head *evt_doneq)
3286 {
3287 long rc;
3288 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3289
3290 switch (crq->valid) {
3291 case IBMVFC_CRQ_INIT_RSP:
3292 switch (crq->format) {
3293 case IBMVFC_CRQ_INIT:
3294 dev_info(vhost->dev, "Partner initialized\n");
3295 /* Send back a response */
3296 rc = ibmvfc_send_crq_init_complete(vhost);
3297 if (rc == 0)
3298 ibmvfc_init_host(vhost);
3299 else
3300 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3301 break;
3302 case IBMVFC_CRQ_INIT_COMPLETE:
3303 dev_info(vhost->dev, "Partner initialization complete\n");
3304 ibmvfc_init_host(vhost);
3305 break;
3306 default:
3307 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3308 }
3309 return;
3310 case IBMVFC_CRQ_XPORT_EVENT:
3311 vhost->state = IBMVFC_NO_CRQ;
3312 vhost->logged_in = 0;
3313 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3314 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3315 /* We need to re-setup the interpartition connection */
3316 dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3317 vhost->client_migrated = 1;
3318
3319 scsi_block_requests(vhost->host);
3320 ibmvfc_purge_requests(vhost, DID_REQUEUE);
3321 ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN);
3322 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3323 wake_up(&vhost->work_wait_q);
3324 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3325 dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3326 ibmvfc_purge_requests(vhost, DID_ERROR);
3327 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3328 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3329 } else {
3330 dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3331 }
3332 return;
3333 case IBMVFC_CRQ_CMD_RSP:
3334 break;
3335 default:
3336 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3337 return;
3338 }
3339
3340 if (crq->format == IBMVFC_ASYNC_EVENT)
3341 return;
3342
3343 /* The only kind of payload CRQs we should get are responses to
3344 * things we send. Make sure this response is to something we
3345 * actually sent
3346 */
3347 if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3348 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3349 crq->ioba);
3350 return;
3351 }
3352
3353 if (unlikely(atomic_dec_if_positive(&evt->active))) {
3354 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3355 crq->ioba);
3356 return;
3357 }
3358
3359 spin_lock(&evt->queue->l_lock);
3360 list_move_tail(&evt->queue_list, evt_doneq);
3361 spin_unlock(&evt->queue->l_lock);
3362 }
3363
3364 /**
3365 * ibmvfc_scan_finished - Check if the device scan is done.
3366 * @shost: scsi host struct
3367 * @time: current elapsed time
3368 *
3369 * Returns:
3370 * 0 if scan is not done / 1 if scan is done
3371 **/
3372 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3373 {
3374 unsigned long flags;
3375 struct ibmvfc_host *vhost = shost_priv(shost);
3376 int done = 0;
3377
3378 spin_lock_irqsave(shost->host_lock, flags);
3379 if (!vhost->scan_timeout)
3380 done = 1;
3381 else if (time >= (vhost->scan_timeout * HZ)) {
3382 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3383 "continuing initialization\n", vhost->scan_timeout);
3384 done = 1;
3385 }
3386
3387 if (vhost->scan_complete) {
3388 vhost->scan_timeout = init_timeout;
3389 done = 1;
3390 }
3391 spin_unlock_irqrestore(shost->host_lock, flags);
3392 return done;
3393 }
3394
3395 /**
3396 * ibmvfc_slave_alloc - Setup the device's task set value
3397 * @sdev: struct scsi_device device to configure
3398 *
3399 * Set the device's task set value so that error handling works as
3400 * expected.
3401 *
3402 * Returns:
3403 * 0 on success / -ENXIO if device does not exist
3404 **/
3405 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3406 {
3407 struct Scsi_Host *shost = sdev->host;
3408 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3409 struct ibmvfc_host *vhost = shost_priv(shost);
3410 unsigned long flags = 0;
3411
3412 if (!rport || fc_remote_port_chkready(rport))
3413 return -ENXIO;
3414
3415 spin_lock_irqsave(shost->host_lock, flags);
3416 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3417 spin_unlock_irqrestore(shost->host_lock, flags);
3418 return 0;
3419 }
3420
3421 /**
3422 * ibmvfc_target_alloc - Setup the target's task set value
3423 * @starget: struct scsi_target
3424 *
3425 * Set the target's task set value so that error handling works as
3426 * expected.
3427 *
3428 * Returns:
3429 * 0 on success / -ENXIO if device does not exist
3430 **/
3431 static int ibmvfc_target_alloc(struct scsi_target *starget)
3432 {
3433 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3434 struct ibmvfc_host *vhost = shost_priv(shost);
3435 unsigned long flags = 0;
3436
3437 spin_lock_irqsave(shost->host_lock, flags);
3438 starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3439 spin_unlock_irqrestore(shost->host_lock, flags);
3440 return 0;
3441 }
3442
3443 /**
3444 * ibmvfc_slave_configure - Configure the device
3445 * @sdev: struct scsi_device device to configure
3446 *
3447 * Enable allow_restart for a device if it is a disk. Adjust the
3448 * queue_depth here also.
3449 *
3450 * Returns:
3451 * 0
3452 **/
3453 static int ibmvfc_slave_configure(struct scsi_device *sdev)
3454 {
3455 struct Scsi_Host *shost = sdev->host;
3456 unsigned long flags = 0;
3457
3458 spin_lock_irqsave(shost->host_lock, flags);
3459 if (sdev->type == TYPE_DISK) {
3460 sdev->allow_restart = 1;
3461 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3462 }
3463 spin_unlock_irqrestore(shost->host_lock, flags);
3464 return 0;
3465 }
3466
3467 /**
3468 * ibmvfc_change_queue_depth - Change the device's queue depth
3469 * @sdev: scsi device struct
3470 * @qdepth: depth to set
3471 *
3472 * Return value:
3473 * actual depth set
3474 **/
3475 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3476 {
3477 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3478 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3479
3480 return scsi_change_queue_depth(sdev, qdepth);
3481 }
3482
3483 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3484 struct device_attribute *attr, char *buf)
3485 {
3486 struct Scsi_Host *shost = class_to_shost(dev);
3487 struct ibmvfc_host *vhost = shost_priv(shost);
3488
3489 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name);
3490 }
3491
3492 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3493 struct device_attribute *attr, char *buf)
3494 {
3495 struct Scsi_Host *shost = class_to_shost(dev);
3496 struct ibmvfc_host *vhost = shost_priv(shost);
3497
3498 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name);
3499 }
3500
3501 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3502 struct device_attribute *attr, char *buf)
3503 {
3504 struct Scsi_Host *shost = class_to_shost(dev);
3505 struct ibmvfc_host *vhost = shost_priv(shost);
3506
3507 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code);
3508 }
3509
3510 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3511 struct device_attribute *attr, char *buf)
3512 {
3513 struct Scsi_Host *shost = class_to_shost(dev);
3514 struct ibmvfc_host *vhost = shost_priv(shost);
3515
3516 return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name);
3517 }
3518
3519 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3520 struct device_attribute *attr, char *buf)
3521 {
3522 struct Scsi_Host *shost = class_to_shost(dev);
3523 struct ibmvfc_host *vhost = shost_priv(shost);
3524 return sysfs_emit(buf, "%d\n",
3525 be32_to_cpu(vhost->login_buf->resp.version));
3526 }
3527
3528 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3529 struct device_attribute *attr, char *buf)
3530 {
3531 struct Scsi_Host *shost = class_to_shost(dev);
3532 struct ibmvfc_host *vhost = shost_priv(shost);
3533 return sysfs_emit(buf, "%llx\n",
3534 be64_to_cpu(vhost->login_buf->resp.capabilities));
3535 }
3536
3537 /**
3538 * ibmvfc_show_log_level - Show the adapter's error logging level
3539 * @dev: class device struct
3540 * @attr: unused
3541 * @buf: buffer
3542 *
3543 * Return value:
3544 * number of bytes printed to buffer
3545 **/
3546 static ssize_t ibmvfc_show_log_level(struct device *dev,
3547 struct device_attribute *attr, char *buf)
3548 {
3549 struct Scsi_Host *shost = class_to_shost(dev);
3550 struct ibmvfc_host *vhost = shost_priv(shost);
3551 unsigned long flags = 0;
3552 int len;
3553
3554 spin_lock_irqsave(shost->host_lock, flags);
3555 len = sysfs_emit(buf, "%d\n", vhost->log_level);
3556 spin_unlock_irqrestore(shost->host_lock, flags);
3557 return len;
3558 }
3559
3560 /**
3561 * ibmvfc_store_log_level - Change the adapter's error logging level
3562 * @dev: class device struct
3563 * @attr: unused
3564 * @buf: buffer
3565 * @count: buffer size
3566 *
3567 * Return value:
3568 * number of bytes printed to buffer
3569 **/
3570 static ssize_t ibmvfc_store_log_level(struct device *dev,
3571 struct device_attribute *attr,
3572 const char *buf, size_t count)
3573 {
3574 struct Scsi_Host *shost = class_to_shost(dev);
3575 struct ibmvfc_host *vhost = shost_priv(shost);
3576 unsigned long flags = 0;
3577
3578 spin_lock_irqsave(shost->host_lock, flags);
3579 vhost->log_level = simple_strtoul(buf, NULL, 10);
3580 spin_unlock_irqrestore(shost->host_lock, flags);
3581 return strlen(buf);
3582 }
3583
3584 static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3585 struct device_attribute *attr, char *buf)
3586 {
3587 struct Scsi_Host *shost = class_to_shost(dev);
3588 struct ibmvfc_host *vhost = shost_priv(shost);
3589 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3590 unsigned long flags = 0;
3591 int len;
3592
3593 spin_lock_irqsave(shost->host_lock, flags);
3594 len = sysfs_emit(buf, "%d\n", scsi->desired_queues);
3595 spin_unlock_irqrestore(shost->host_lock, flags);
3596 return len;
3597 }
3598
3599 static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3600 struct device_attribute *attr,
3601 const char *buf, size_t count)
3602 {
3603 struct Scsi_Host *shost = class_to_shost(dev);
3604 struct ibmvfc_host *vhost = shost_priv(shost);
3605 struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3606 unsigned long flags = 0;
3607 unsigned int channels;
3608
3609 spin_lock_irqsave(shost->host_lock, flags);
3610 channels = simple_strtoul(buf, NULL, 10);
3611 scsi->desired_queues = min(channels, shost->nr_hw_queues);
3612 ibmvfc_hard_reset_host(vhost);
3613 spin_unlock_irqrestore(shost->host_lock, flags);
3614 return strlen(buf);
3615 }
3616
3617 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3618 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3619 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3620 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3621 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3622 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3623 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3624 ibmvfc_show_log_level, ibmvfc_store_log_level);
3625 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3626 ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3627
3628 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3629 /**
3630 * ibmvfc_read_trace - Dump the adapter trace
3631 * @filp: open sysfs file
3632 * @kobj: kobject struct
3633 * @bin_attr: bin_attribute struct
3634 * @buf: buffer
3635 * @off: offset
3636 * @count: buffer size
3637 *
3638 * Return value:
3639 * number of bytes printed to buffer
3640 **/
3641 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3642 struct bin_attribute *bin_attr,
3643 char *buf, loff_t off, size_t count)
3644 {
3645 struct device *dev = kobj_to_dev(kobj);
3646 struct Scsi_Host *shost = class_to_shost(dev);
3647 struct ibmvfc_host *vhost = shost_priv(shost);
3648 unsigned long flags = 0;
3649 int size = IBMVFC_TRACE_SIZE;
3650 char *src = (char *)vhost->trace;
3651
3652 if (off > size)
3653 return 0;
3654 if (off + count > size) {
3655 size -= off;
3656 count = size;
3657 }
3658
3659 spin_lock_irqsave(shost->host_lock, flags);
3660 memcpy(buf, &src[off], count);
3661 spin_unlock_irqrestore(shost->host_lock, flags);
3662 return count;
3663 }
3664
3665 static struct bin_attribute ibmvfc_trace_attr = {
3666 .attr = {
3667 .name = "trace",
3668 .mode = S_IRUGO,
3669 },
3670 .size = 0,
3671 .read = ibmvfc_read_trace,
3672 };
3673 #endif
3674
3675 static struct attribute *ibmvfc_host_attrs[] = {
3676 &dev_attr_partition_name.attr,
3677 &dev_attr_device_name.attr,
3678 &dev_attr_port_loc_code.attr,
3679 &dev_attr_drc_name.attr,
3680 &dev_attr_npiv_version.attr,
3681 &dev_attr_capabilities.attr,
3682 &dev_attr_log_level.attr,
3683 &dev_attr_nr_scsi_channels.attr,
3684 NULL
3685 };
3686
3687 ATTRIBUTE_GROUPS(ibmvfc_host);
3688
3689 static const struct scsi_host_template driver_template = {
3690 .module = THIS_MODULE,
3691 .name = "IBM POWER Virtual FC Adapter",
3692 .proc_name = IBMVFC_NAME,
3693 .queuecommand = ibmvfc_queuecommand,
3694 .eh_timed_out = fc_eh_timed_out,
3695 .eh_abort_handler = ibmvfc_eh_abort_handler,
3696 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3697 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3698 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3699 .slave_alloc = ibmvfc_slave_alloc,
3700 .slave_configure = ibmvfc_slave_configure,
3701 .target_alloc = ibmvfc_target_alloc,
3702 .scan_finished = ibmvfc_scan_finished,
3703 .change_queue_depth = ibmvfc_change_queue_depth,
3704 .cmd_per_lun = 16,
3705 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3706 .this_id = -1,
3707 .sg_tablesize = SG_ALL,
3708 .max_sectors = IBMVFC_MAX_SECTORS,
3709 .shost_groups = ibmvfc_host_groups,
3710 .track_queue_depth = 1,
3711 };
3712
3713 /**
3714 * ibmvfc_next_async_crq - Returns the next entry in async queue
3715 * @vhost: ibmvfc host struct
3716 *
3717 * Returns:
3718 * Pointer to next entry in queue / NULL if empty
3719 **/
3720 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3721 {
3722 struct ibmvfc_queue *async_crq = &vhost->async_crq;
3723 struct ibmvfc_async_crq *crq;
3724
3725 crq = &async_crq->msgs.async[async_crq->cur];
3726 if (crq->valid & 0x80) {
3727 if (++async_crq->cur == async_crq->size)
3728 async_crq->cur = 0;
3729 rmb();
3730 } else
3731 crq = NULL;
3732
3733 return crq;
3734 }
3735
3736 /**
3737 * ibmvfc_next_crq - Returns the next entry in message queue
3738 * @vhost: ibmvfc host struct
3739 *
3740 * Returns:
3741 * Pointer to next entry in queue / NULL if empty
3742 **/
3743 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3744 {
3745 struct ibmvfc_queue *queue = &vhost->crq;
3746 struct ibmvfc_crq *crq;
3747
3748 crq = &queue->msgs.crq[queue->cur];
3749 if (crq->valid & 0x80) {
3750 if (++queue->cur == queue->size)
3751 queue->cur = 0;
3752 rmb();
3753 } else
3754 crq = NULL;
3755
3756 return crq;
3757 }
3758
3759 /**
3760 * ibmvfc_interrupt - Interrupt handler
3761 * @irq: number of irq to handle, not used
3762 * @dev_instance: ibmvfc_host that received interrupt
3763 *
3764 * Returns:
3765 * IRQ_HANDLED
3766 **/
3767 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3768 {
3769 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3770 unsigned long flags;
3771
3772 spin_lock_irqsave(vhost->host->host_lock, flags);
3773 vio_disable_interrupts(to_vio_dev(vhost->dev));
3774 tasklet_schedule(&vhost->tasklet);
3775 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3776 return IRQ_HANDLED;
3777 }
3778
3779 /**
3780 * ibmvfc_tasklet - Interrupt handler tasklet
3781 * @data: ibmvfc host struct
3782 *
3783 * Returns:
3784 * Nothing
3785 **/
3786 static void ibmvfc_tasklet(void *data)
3787 {
3788 struct ibmvfc_host *vhost = data;
3789 struct vio_dev *vdev = to_vio_dev(vhost->dev);
3790 struct ibmvfc_crq *crq;
3791 struct ibmvfc_async_crq *async;
3792 struct ibmvfc_event *evt, *temp;
3793 unsigned long flags;
3794 int done = 0;
3795 LIST_HEAD(evt_doneq);
3796
3797 spin_lock_irqsave(vhost->host->host_lock, flags);
3798 spin_lock(vhost->crq.q_lock);
3799 while (!done) {
3800 /* Pull all the valid messages off the async CRQ */
3801 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3802 ibmvfc_handle_async(async, vhost);
3803 async->valid = 0;
3804 wmb();
3805 }
3806
3807 /* Pull all the valid messages off the CRQ */
3808 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3809 ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3810 crq->valid = 0;
3811 wmb();
3812 }
3813
3814 vio_enable_interrupts(vdev);
3815 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3816 vio_disable_interrupts(vdev);
3817 ibmvfc_handle_async(async, vhost);
3818 async->valid = 0;
3819 wmb();
3820 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3821 vio_disable_interrupts(vdev);
3822 ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3823 crq->valid = 0;
3824 wmb();
3825 } else
3826 done = 1;
3827 }
3828
3829 spin_unlock(vhost->crq.q_lock);
3830 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3831
3832 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3833 del_timer(&evt->timer);
3834 list_del(&evt->queue_list);
3835 ibmvfc_trc_end(evt);
3836 evt->done(evt);
3837 }
3838 }
3839
3840 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3841 {
3842 struct device *dev = scrq->vhost->dev;
3843 struct vio_dev *vdev = to_vio_dev(dev);
3844 unsigned long rc;
3845 int irq_action = H_ENABLE_VIO_INTERRUPT;
3846
3847 if (!enable)
3848 irq_action = H_DISABLE_VIO_INTERRUPT;
3849
3850 rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3851 scrq->hw_irq, 0, 0);
3852
3853 if (rc)
3854 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3855 enable ? "enable" : "disable", scrq->hwq_id, rc);
3856
3857 return rc;
3858 }
3859
3860 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3861 struct list_head *evt_doneq)
3862 {
3863 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3864
3865 switch (crq->valid) {
3866 case IBMVFC_CRQ_CMD_RSP:
3867 break;
3868 case IBMVFC_CRQ_XPORT_EVENT:
3869 return;
3870 default:
3871 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3872 return;
3873 }
3874
3875 /* The only kind of payload CRQs we should get are responses to
3876 * things we send. Make sure this response is to something we
3877 * actually sent
3878 */
3879 if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3880 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3881 crq->ioba);
3882 return;
3883 }
3884
3885 if (unlikely(atomic_dec_if_positive(&evt->active))) {
3886 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3887 crq->ioba);
3888 return;
3889 }
3890
3891 spin_lock(&evt->queue->l_lock);
3892 list_move_tail(&evt->queue_list, evt_doneq);
3893 spin_unlock(&evt->queue->l_lock);
3894 }
3895
3896 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3897 {
3898 struct ibmvfc_crq *crq;
3899
3900 crq = &scrq->msgs.scrq[scrq->cur].crq;
3901 if (crq->valid & 0x80) {
3902 if (++scrq->cur == scrq->size)
3903 scrq->cur = 0;
3904 rmb();
3905 } else
3906 crq = NULL;
3907
3908 return crq;
3909 }
3910
3911 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3912 {
3913 struct ibmvfc_crq *crq;
3914 struct ibmvfc_event *evt, *temp;
3915 unsigned long flags;
3916 int done = 0;
3917 LIST_HEAD(evt_doneq);
3918
3919 spin_lock_irqsave(scrq->q_lock, flags);
3920 while (!done) {
3921 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3922 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3923 crq->valid = 0;
3924 wmb();
3925 }
3926
3927 ibmvfc_toggle_scrq_irq(scrq, 1);
3928 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3929 ibmvfc_toggle_scrq_irq(scrq, 0);
3930 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3931 crq->valid = 0;
3932 wmb();
3933 } else
3934 done = 1;
3935 }
3936 spin_unlock_irqrestore(scrq->q_lock, flags);
3937
3938 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3939 del_timer(&evt->timer);
3940 list_del(&evt->queue_list);
3941 ibmvfc_trc_end(evt);
3942 evt->done(evt);
3943 }
3944 }
3945
3946 static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3947 {
3948 struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3949
3950 ibmvfc_toggle_scrq_irq(scrq, 0);
3951 ibmvfc_drain_sub_crq(scrq);
3952
3953 return IRQ_HANDLED;
3954 }
3955
3956 /**
3957 * ibmvfc_init_tgt - Set the next init job step for the target
3958 * @tgt: ibmvfc target struct
3959 * @job_step: job step to perform
3960 *
3961 **/
3962 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3963 void (*job_step) (struct ibmvfc_target *))
3964 {
3965 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3966 tgt->job_step = job_step;
3967 wake_up(&tgt->vhost->work_wait_q);
3968 }
3969
3970 /**
3971 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3972 * @tgt: ibmvfc target struct
3973 * @job_step: initialization job step
3974 *
3975 * Returns: 1 if step will be retried / 0 if not
3976 *
3977 **/
3978 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3979 void (*job_step) (struct ibmvfc_target *))
3980 {
3981 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3982 ibmvfc_del_tgt(tgt);
3983 wake_up(&tgt->vhost->work_wait_q);
3984 return 0;
3985 } else
3986 ibmvfc_init_tgt(tgt, job_step);
3987 return 1;
3988 }
3989
3990 /* Defined in FC-LS */
3991 static const struct {
3992 int code;
3993 int retry;
3994 int logged_in;
3995 } prli_rsp [] = {
3996 { 0, 1, 0 },
3997 { 1, 0, 1 },
3998 { 2, 1, 0 },
3999 { 3, 1, 0 },
4000 { 4, 0, 0 },
4001 { 5, 0, 0 },
4002 { 6, 0, 1 },
4003 { 7, 0, 0 },
4004 { 8, 1, 0 },
4005 };
4006
4007 /**
4008 * ibmvfc_get_prli_rsp - Find PRLI response index
4009 * @flags: PRLI response flags
4010 *
4011 **/
4012 static int ibmvfc_get_prli_rsp(u16 flags)
4013 {
4014 int i;
4015 int code = (flags & 0x0f00) >> 8;
4016
4017 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4018 if (prli_rsp[i].code == code)
4019 return i;
4020
4021 return 0;
4022 }
4023
4024 /**
4025 * ibmvfc_tgt_prli_done - Completion handler for Process Login
4026 * @evt: ibmvfc event struct
4027 *
4028 **/
4029 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4030 {
4031 struct ibmvfc_target *tgt = evt->tgt;
4032 struct ibmvfc_host *vhost = evt->vhost;
4033 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4034 struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4035 u32 status = be16_to_cpu(rsp->common.status);
4036 int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4037
4038 vhost->discovery_threads--;
4039 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4040 switch (status) {
4041 case IBMVFC_MAD_SUCCESS:
4042 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4043 parms->type, parms->flags, parms->service_parms);
4044
4045 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4046 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4047 if (prli_rsp[index].logged_in) {
4048 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4049 tgt->need_login = 0;
4050 tgt->ids.roles = 0;
4051 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4052 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4053 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4054 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4055 tgt->add_rport = 1;
4056 } else
4057 ibmvfc_del_tgt(tgt);
4058 } else if (prli_rsp[index].retry)
4059 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4060 else
4061 ibmvfc_del_tgt(tgt);
4062 } else
4063 ibmvfc_del_tgt(tgt);
4064 break;
4065 case IBMVFC_MAD_DRIVER_FAILED:
4066 break;
4067 case IBMVFC_MAD_CRQ_ERROR:
4068 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4069 break;
4070 case IBMVFC_MAD_FAILED:
4071 default:
4072 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4073 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4074 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4075 else if (tgt->logo_rcvd)
4076 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4077 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4078 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4079 else
4080 ibmvfc_del_tgt(tgt);
4081
4082 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4083 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4084 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4085 break;
4086 }
4087
4088 kref_put(&tgt->kref, ibmvfc_release_tgt);
4089 ibmvfc_free_event(evt);
4090 wake_up(&vhost->work_wait_q);
4091 }
4092
4093 /**
4094 * ibmvfc_tgt_send_prli - Send a process login
4095 * @tgt: ibmvfc target struct
4096 *
4097 **/
4098 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4099 {
4100 struct ibmvfc_process_login *prli;
4101 struct ibmvfc_host *vhost = tgt->vhost;
4102 struct ibmvfc_event *evt;
4103
4104 if (vhost->discovery_threads >= disc_threads)
4105 return;
4106
4107 kref_get(&tgt->kref);
4108 evt = ibmvfc_get_reserved_event(&vhost->crq);
4109 if (!evt) {
4110 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4111 kref_put(&tgt->kref, ibmvfc_release_tgt);
4112 __ibmvfc_reset_host(vhost);
4113 return;
4114 }
4115 vhost->discovery_threads++;
4116 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4117 evt->tgt = tgt;
4118 prli = &evt->iu.prli;
4119 memset(prli, 0, sizeof(*prli));
4120 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4121 prli->common.version = cpu_to_be32(2);
4122 prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4123 } else {
4124 prli->common.version = cpu_to_be32(1);
4125 }
4126 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4127 prli->common.length = cpu_to_be16(sizeof(*prli));
4128 prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4129
4130 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4131 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4132 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4133 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4134
4135 if (cls3_error)
4136 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4137
4138 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4139 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4140 vhost->discovery_threads--;
4141 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4142 kref_put(&tgt->kref, ibmvfc_release_tgt);
4143 } else
4144 tgt_dbg(tgt, "Sent process login\n");
4145 }
4146
4147 /**
4148 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4149 * @evt: ibmvfc event struct
4150 *
4151 **/
4152 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4153 {
4154 struct ibmvfc_target *tgt = evt->tgt;
4155 struct ibmvfc_host *vhost = evt->vhost;
4156 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4157 u32 status = be16_to_cpu(rsp->common.status);
4158 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4159
4160 vhost->discovery_threads--;
4161 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4162 switch (status) {
4163 case IBMVFC_MAD_SUCCESS:
4164 tgt_dbg(tgt, "Port Login succeeded\n");
4165 if (tgt->ids.port_name &&
4166 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4167 vhost->reinit = 1;
4168 tgt_dbg(tgt, "Port re-init required\n");
4169 break;
4170 }
4171 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4172 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4173 tgt->ids.port_id = tgt->scsi_id;
4174 memcpy(&tgt->service_parms, &rsp->service_parms,
4175 sizeof(tgt->service_parms));
4176 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4177 sizeof(tgt->service_parms_change));
4178 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4179 break;
4180 case IBMVFC_MAD_DRIVER_FAILED:
4181 break;
4182 case IBMVFC_MAD_CRQ_ERROR:
4183 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4184 break;
4185 case IBMVFC_MAD_FAILED:
4186 default:
4187 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4188 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4189 else
4190 ibmvfc_del_tgt(tgt);
4191
4192 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4193 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4194 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4195 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4196 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4197 break;
4198 }
4199
4200 kref_put(&tgt->kref, ibmvfc_release_tgt);
4201 ibmvfc_free_event(evt);
4202 wake_up(&vhost->work_wait_q);
4203 }
4204
4205 /**
4206 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4207 * @tgt: ibmvfc target struct
4208 *
4209 **/
4210 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4211 {
4212 struct ibmvfc_port_login *plogi;
4213 struct ibmvfc_host *vhost = tgt->vhost;
4214 struct ibmvfc_event *evt;
4215
4216 if (vhost->discovery_threads >= disc_threads)
4217 return;
4218
4219 kref_get(&tgt->kref);
4220 tgt->logo_rcvd = 0;
4221 evt = ibmvfc_get_reserved_event(&vhost->crq);
4222 if (!evt) {
4223 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4224 kref_put(&tgt->kref, ibmvfc_release_tgt);
4225 __ibmvfc_reset_host(vhost);
4226 return;
4227 }
4228 vhost->discovery_threads++;
4229 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4230 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4231 evt->tgt = tgt;
4232 plogi = &evt->iu.plogi;
4233 memset(plogi, 0, sizeof(*plogi));
4234 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4235 plogi->common.version = cpu_to_be32(2);
4236 plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4237 } else {
4238 plogi->common.version = cpu_to_be32(1);
4239 }
4240 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4241 plogi->common.length = cpu_to_be16(sizeof(*plogi));
4242 plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4243
4244 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4245 vhost->discovery_threads--;
4246 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4247 kref_put(&tgt->kref, ibmvfc_release_tgt);
4248 } else
4249 tgt_dbg(tgt, "Sent port login\n");
4250 }
4251
4252 /**
4253 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4254 * @evt: ibmvfc event struct
4255 *
4256 **/
4257 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4258 {
4259 struct ibmvfc_target *tgt = evt->tgt;
4260 struct ibmvfc_host *vhost = evt->vhost;
4261 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4262 u32 status = be16_to_cpu(rsp->common.status);
4263
4264 vhost->discovery_threads--;
4265 ibmvfc_free_event(evt);
4266 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4267
4268 switch (status) {
4269 case IBMVFC_MAD_SUCCESS:
4270 tgt_dbg(tgt, "Implicit Logout succeeded\n");
4271 break;
4272 case IBMVFC_MAD_DRIVER_FAILED:
4273 kref_put(&tgt->kref, ibmvfc_release_tgt);
4274 wake_up(&vhost->work_wait_q);
4275 return;
4276 case IBMVFC_MAD_FAILED:
4277 default:
4278 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4279 break;
4280 }
4281
4282 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4283 kref_put(&tgt->kref, ibmvfc_release_tgt);
4284 wake_up(&vhost->work_wait_q);
4285 }
4286
4287 /**
4288 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4289 * @tgt: ibmvfc target struct
4290 * @done: Routine to call when the event is responded to
4291 *
4292 * Returns:
4293 * Allocated and initialized ibmvfc_event struct
4294 **/
4295 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4296 void (*done) (struct ibmvfc_event *))
4297 {
4298 struct ibmvfc_implicit_logout *mad;
4299 struct ibmvfc_host *vhost = tgt->vhost;
4300 struct ibmvfc_event *evt;
4301
4302 kref_get(&tgt->kref);
4303 evt = ibmvfc_get_reserved_event(&vhost->crq);
4304 if (!evt)
4305 return NULL;
4306 ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4307 evt->tgt = tgt;
4308 mad = &evt->iu.implicit_logout;
4309 memset(mad, 0, sizeof(*mad));
4310 mad->common.version = cpu_to_be32(1);
4311 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4312 mad->common.length = cpu_to_be16(sizeof(*mad));
4313 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4314 return evt;
4315 }
4316
4317 /**
4318 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4319 * @tgt: ibmvfc target struct
4320 *
4321 **/
4322 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4323 {
4324 struct ibmvfc_host *vhost = tgt->vhost;
4325 struct ibmvfc_event *evt;
4326
4327 if (vhost->discovery_threads >= disc_threads)
4328 return;
4329
4330 vhost->discovery_threads++;
4331 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4332 ibmvfc_tgt_implicit_logout_done);
4333 if (!evt) {
4334 vhost->discovery_threads--;
4335 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4336 kref_put(&tgt->kref, ibmvfc_release_tgt);
4337 __ibmvfc_reset_host(vhost);
4338 return;
4339 }
4340
4341 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4342 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4343 vhost->discovery_threads--;
4344 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4345 kref_put(&tgt->kref, ibmvfc_release_tgt);
4346 } else
4347 tgt_dbg(tgt, "Sent Implicit Logout\n");
4348 }
4349
4350 /**
4351 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4352 * @evt: ibmvfc event struct
4353 *
4354 **/
4355 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4356 {
4357 struct ibmvfc_target *tgt = evt->tgt;
4358 struct ibmvfc_host *vhost = evt->vhost;
4359 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4360 u32 status = be16_to_cpu(mad->common.status);
4361
4362 vhost->discovery_threads--;
4363 ibmvfc_free_event(evt);
4364
4365 /*
4366 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4367 * driver in which case we need to free up all the targets. If we are
4368 * not unloading, we will still go through a hard reset to get out of
4369 * offline state, so there is no need to track the old targets in that
4370 * case.
4371 */
4372 if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4373 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4374 else
4375 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4376
4377 tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4378 kref_put(&tgt->kref, ibmvfc_release_tgt);
4379 wake_up(&vhost->work_wait_q);
4380 }
4381
4382 /**
4383 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4384 * @tgt: ibmvfc target struct
4385 *
4386 **/
4387 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4388 {
4389 struct ibmvfc_host *vhost = tgt->vhost;
4390 struct ibmvfc_event *evt;
4391
4392 if (!vhost->logged_in) {
4393 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4394 return;
4395 }
4396
4397 if (vhost->discovery_threads >= disc_threads)
4398 return;
4399
4400 vhost->discovery_threads++;
4401 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4402 ibmvfc_tgt_implicit_logout_and_del_done);
4403
4404 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4405 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4406 vhost->discovery_threads--;
4407 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4408 kref_put(&tgt->kref, ibmvfc_release_tgt);
4409 } else
4410 tgt_dbg(tgt, "Sent Implicit Logout\n");
4411 }
4412
4413 /**
4414 * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4415 * @evt: ibmvfc event struct
4416 *
4417 **/
4418 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4419 {
4420 struct ibmvfc_target *tgt = evt->tgt;
4421 struct ibmvfc_host *vhost = evt->vhost;
4422 struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4423 u32 status = be16_to_cpu(rsp->common.status);
4424 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4425
4426 vhost->discovery_threads--;
4427 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4428 switch (status) {
4429 case IBMVFC_MAD_SUCCESS:
4430 tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4431 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4432 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4433 tgt->scsi_id = tgt->new_scsi_id;
4434 tgt->ids.port_id = tgt->scsi_id;
4435 memcpy(&tgt->service_parms, &rsp->service_parms,
4436 sizeof(tgt->service_parms));
4437 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4438 sizeof(tgt->service_parms_change));
4439 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4440 break;
4441 case IBMVFC_MAD_DRIVER_FAILED:
4442 break;
4443 case IBMVFC_MAD_CRQ_ERROR:
4444 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4445 break;
4446 case IBMVFC_MAD_FAILED:
4447 default:
4448 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4449
4450 tgt_log(tgt, level,
4451 "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4452 tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4453 status);
4454 break;
4455 }
4456
4457 kref_put(&tgt->kref, ibmvfc_release_tgt);
4458 ibmvfc_free_event(evt);
4459 wake_up(&vhost->work_wait_q);
4460 }
4461
4462
4463 /**
4464 * ibmvfc_tgt_move_login - Initiate a move login for specified target
4465 * @tgt: ibmvfc target struct
4466 *
4467 **/
4468 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4469 {
4470 struct ibmvfc_host *vhost = tgt->vhost;
4471 struct ibmvfc_move_login *move;
4472 struct ibmvfc_event *evt;
4473
4474 if (vhost->discovery_threads >= disc_threads)
4475 return;
4476
4477 kref_get(&tgt->kref);
4478 evt = ibmvfc_get_reserved_event(&vhost->crq);
4479 if (!evt) {
4480 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4481 kref_put(&tgt->kref, ibmvfc_release_tgt);
4482 __ibmvfc_reset_host(vhost);
4483 return;
4484 }
4485 vhost->discovery_threads++;
4486 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4487 ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4488 evt->tgt = tgt;
4489 move = &evt->iu.move_login;
4490 memset(move, 0, sizeof(*move));
4491 move->common.version = cpu_to_be32(1);
4492 move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4493 move->common.length = cpu_to_be16(sizeof(*move));
4494
4495 move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4496 move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4497 move->wwpn = cpu_to_be64(tgt->wwpn);
4498 move->node_name = cpu_to_be64(tgt->ids.node_name);
4499
4500 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4501 vhost->discovery_threads--;
4502 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4503 kref_put(&tgt->kref, ibmvfc_release_tgt);
4504 } else
4505 tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4506 }
4507
4508 /**
4509 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4510 * @mad: ibmvfc passthru mad struct
4511 * @tgt: ibmvfc target struct
4512 *
4513 * Returns:
4514 * 1 if PLOGI needed / 0 if PLOGI not needed
4515 **/
4516 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4517 struct ibmvfc_target *tgt)
4518 {
4519 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4520 return 1;
4521 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4522 return 1;
4523 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4524 return 1;
4525 return 0;
4526 }
4527
4528 /**
4529 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4530 * @evt: ibmvfc event struct
4531 *
4532 **/
4533 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4534 {
4535 struct ibmvfc_target *tgt = evt->tgt;
4536 struct ibmvfc_host *vhost = evt->vhost;
4537 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4538 u32 status = be16_to_cpu(mad->common.status);
4539 u8 fc_reason, fc_explain;
4540
4541 vhost->discovery_threads--;
4542 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4543 del_timer(&tgt->timer);
4544
4545 switch (status) {
4546 case IBMVFC_MAD_SUCCESS:
4547 tgt_dbg(tgt, "ADISC succeeded\n");
4548 if (ibmvfc_adisc_needs_plogi(mad, tgt))
4549 ibmvfc_del_tgt(tgt);
4550 break;
4551 case IBMVFC_MAD_DRIVER_FAILED:
4552 break;
4553 case IBMVFC_MAD_FAILED:
4554 default:
4555 ibmvfc_del_tgt(tgt);
4556 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4557 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4558 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4559 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4560 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4561 ibmvfc_get_fc_type(fc_reason), fc_reason,
4562 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4563 break;
4564 }
4565
4566 kref_put(&tgt->kref, ibmvfc_release_tgt);
4567 ibmvfc_free_event(evt);
4568 wake_up(&vhost->work_wait_q);
4569 }
4570
4571 /**
4572 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4573 * @evt: ibmvfc event struct
4574 *
4575 **/
4576 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4577 {
4578 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4579
4580 memset(mad, 0, sizeof(*mad));
4581 mad->common.version = cpu_to_be32(1);
4582 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4583 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4584 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4585 offsetof(struct ibmvfc_passthru_mad, iu));
4586 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4587 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4588 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4589 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4590 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4591 offsetof(struct ibmvfc_passthru_fc_iu, payload));
4592 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4593 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4594 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4595 offsetof(struct ibmvfc_passthru_fc_iu, response));
4596 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4597 }
4598
4599 /**
4600 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4601 * @evt: ibmvfc event struct
4602 *
4603 * Just cleanup this event struct. Everything else is handled by
4604 * the ADISC completion handler. If the ADISC never actually comes
4605 * back, we still have the timer running on the ADISC event struct
4606 * which will fire and cause the CRQ to get reset.
4607 *
4608 **/
4609 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4610 {
4611 struct ibmvfc_host *vhost = evt->vhost;
4612 struct ibmvfc_target *tgt = evt->tgt;
4613
4614 tgt_dbg(tgt, "ADISC cancel complete\n");
4615 vhost->abort_threads--;
4616 ibmvfc_free_event(evt);
4617 kref_put(&tgt->kref, ibmvfc_release_tgt);
4618 wake_up(&vhost->work_wait_q);
4619 }
4620
4621 /**
4622 * ibmvfc_adisc_timeout - Handle an ADISC timeout
4623 * @t: ibmvfc target struct
4624 *
4625 * If an ADISC times out, send a cancel. If the cancel times
4626 * out, reset the CRQ. When the ADISC comes back as cancelled,
4627 * log back into the target.
4628 **/
4629 static void ibmvfc_adisc_timeout(struct timer_list *t)
4630 {
4631 struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4632 struct ibmvfc_host *vhost = tgt->vhost;
4633 struct ibmvfc_event *evt;
4634 struct ibmvfc_tmf *tmf;
4635 unsigned long flags;
4636 int rc;
4637
4638 tgt_dbg(tgt, "ADISC timeout\n");
4639 spin_lock_irqsave(vhost->host->host_lock, flags);
4640 if (vhost->abort_threads >= disc_threads ||
4641 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4642 vhost->state != IBMVFC_INITIALIZING ||
4643 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4644 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4645 return;
4646 }
4647
4648 vhost->abort_threads++;
4649 kref_get(&tgt->kref);
4650 evt = ibmvfc_get_reserved_event(&vhost->crq);
4651 if (!evt) {
4652 tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4653 vhost->abort_threads--;
4654 kref_put(&tgt->kref, ibmvfc_release_tgt);
4655 __ibmvfc_reset_host(vhost);
4656 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4657 return;
4658 }
4659 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4660
4661 evt->tgt = tgt;
4662 tmf = &evt->iu.tmf;
4663 memset(tmf, 0, sizeof(*tmf));
4664 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4665 tmf->common.version = cpu_to_be32(2);
4666 tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4667 } else {
4668 tmf->common.version = cpu_to_be32(1);
4669 }
4670 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4671 tmf->common.length = cpu_to_be16(sizeof(*tmf));
4672 tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4673 tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4674
4675 rc = ibmvfc_send_event(evt, vhost, default_timeout);
4676
4677 if (rc) {
4678 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4679 vhost->abort_threads--;
4680 kref_put(&tgt->kref, ibmvfc_release_tgt);
4681 __ibmvfc_reset_host(vhost);
4682 } else
4683 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4684 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4685 }
4686
4687 /**
4688 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4689 * @tgt: ibmvfc target struct
4690 *
4691 * When sending an ADISC we end up with two timers running. The
4692 * first timer is the timer in the ibmvfc target struct. If this
4693 * fires, we send a cancel to the target. The second timer is the
4694 * timer on the ibmvfc event for the ADISC, which is longer. If that
4695 * fires, it means the ADISC timed out and our attempt to cancel it
4696 * also failed, so we need to reset the CRQ.
4697 **/
4698 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4699 {
4700 struct ibmvfc_passthru_mad *mad;
4701 struct ibmvfc_host *vhost = tgt->vhost;
4702 struct ibmvfc_event *evt;
4703
4704 if (vhost->discovery_threads >= disc_threads)
4705 return;
4706
4707 kref_get(&tgt->kref);
4708 evt = ibmvfc_get_reserved_event(&vhost->crq);
4709 if (!evt) {
4710 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4711 kref_put(&tgt->kref, ibmvfc_release_tgt);
4712 __ibmvfc_reset_host(vhost);
4713 return;
4714 }
4715 vhost->discovery_threads++;
4716 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4717 evt->tgt = tgt;
4718
4719 ibmvfc_init_passthru(evt);
4720 mad = &evt->iu.passthru;
4721 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4722 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4723 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4724
4725 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4726 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4727 sizeof(vhost->login_buf->resp.port_name));
4728 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4729 sizeof(vhost->login_buf->resp.node_name));
4730 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4731
4732 if (timer_pending(&tgt->timer))
4733 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4734 else {
4735 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4736 add_timer(&tgt->timer);
4737 }
4738
4739 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4740 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4741 vhost->discovery_threads--;
4742 del_timer(&tgt->timer);
4743 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4744 kref_put(&tgt->kref, ibmvfc_release_tgt);
4745 } else
4746 tgt_dbg(tgt, "Sent ADISC\n");
4747 }
4748
4749 /**
4750 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4751 * @evt: ibmvfc event struct
4752 *
4753 **/
4754 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4755 {
4756 struct ibmvfc_target *tgt = evt->tgt;
4757 struct ibmvfc_host *vhost = evt->vhost;
4758 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4759 u32 status = be16_to_cpu(rsp->common.status);
4760 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4761
4762 vhost->discovery_threads--;
4763 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4764 switch (status) {
4765 case IBMVFC_MAD_SUCCESS:
4766 tgt_dbg(tgt, "Query Target succeeded\n");
4767 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4768 ibmvfc_del_tgt(tgt);
4769 else
4770 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4771 break;
4772 case IBMVFC_MAD_DRIVER_FAILED:
4773 break;
4774 case IBMVFC_MAD_CRQ_ERROR:
4775 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4776 break;
4777 case IBMVFC_MAD_FAILED:
4778 default:
4779 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4780 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4781 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4782 ibmvfc_del_tgt(tgt);
4783 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4784 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4785 else
4786 ibmvfc_del_tgt(tgt);
4787
4788 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4789 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4790 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4791 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4792 ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4793 status);
4794 break;
4795 }
4796
4797 kref_put(&tgt->kref, ibmvfc_release_tgt);
4798 ibmvfc_free_event(evt);
4799 wake_up(&vhost->work_wait_q);
4800 }
4801
4802 /**
4803 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4804 * @tgt: ibmvfc target struct
4805 *
4806 **/
4807 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4808 {
4809 struct ibmvfc_query_tgt *query_tgt;
4810 struct ibmvfc_host *vhost = tgt->vhost;
4811 struct ibmvfc_event *evt;
4812
4813 if (vhost->discovery_threads >= disc_threads)
4814 return;
4815
4816 kref_get(&tgt->kref);
4817 evt = ibmvfc_get_reserved_event(&vhost->crq);
4818 if (!evt) {
4819 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4820 kref_put(&tgt->kref, ibmvfc_release_tgt);
4821 __ibmvfc_reset_host(vhost);
4822 return;
4823 }
4824 vhost->discovery_threads++;
4825 evt->tgt = tgt;
4826 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4827 query_tgt = &evt->iu.query_tgt;
4828 memset(query_tgt, 0, sizeof(*query_tgt));
4829 query_tgt->common.version = cpu_to_be32(1);
4830 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4831 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4832 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4833
4834 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4835 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4836 vhost->discovery_threads--;
4837 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4838 kref_put(&tgt->kref, ibmvfc_release_tgt);
4839 } else
4840 tgt_dbg(tgt, "Sent Query Target\n");
4841 }
4842
4843 /**
4844 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4845 * @vhost: ibmvfc host struct
4846 * @target: Holds SCSI ID to allocate target forand the WWPN
4847 *
4848 * Returns:
4849 * 0 on success / other on failure
4850 **/
4851 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4852 struct ibmvfc_discover_targets_entry *target)
4853 {
4854 struct ibmvfc_target *stgt = NULL;
4855 struct ibmvfc_target *wtgt = NULL;
4856 struct ibmvfc_target *tgt;
4857 unsigned long flags;
4858 u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4859 u64 wwpn = be64_to_cpu(target->wwpn);
4860
4861 /* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4862 spin_lock_irqsave(vhost->host->host_lock, flags);
4863 list_for_each_entry(tgt, &vhost->targets, queue) {
4864 if (tgt->wwpn == wwpn) {
4865 wtgt = tgt;
4866 break;
4867 }
4868 }
4869
4870 list_for_each_entry(tgt, &vhost->targets, queue) {
4871 if (tgt->scsi_id == scsi_id) {
4872 stgt = tgt;
4873 break;
4874 }
4875 }
4876
4877 if (wtgt && !stgt) {
4878 /*
4879 * A WWPN target has moved and we still are tracking the old
4880 * SCSI ID. The only way we should be able to get here is if
4881 * we attempted to send an implicit logout for the old SCSI ID
4882 * and it failed for some reason, such as there being I/O
4883 * pending to the target. In this case, we will have already
4884 * deleted the rport from the FC transport so we do a move
4885 * login, which works even with I/O pending, however, if
4886 * there is still I/O pending, it will stay outstanding, so
4887 * we only do this if fast fail is disabled for the rport,
4888 * otherwise we let terminate_rport_io clean up the port
4889 * before we login at the new location.
4890 */
4891 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4892 if (wtgt->move_login) {
4893 /*
4894 * Do a move login here. The old target is no longer
4895 * known to the transport layer We don't use the
4896 * normal ibmvfc_set_tgt_action to set this, as we
4897 * don't normally want to allow this state change.
4898 */
4899 wtgt->new_scsi_id = scsi_id;
4900 wtgt->action = IBMVFC_TGT_ACTION_INIT;
4901 wtgt->init_retries = 0;
4902 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4903 }
4904 goto unlock_out;
4905 } else {
4906 tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4907 wtgt->action, wtgt->rport);
4908 }
4909 } else if (stgt) {
4910 if (tgt->need_login)
4911 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4912 goto unlock_out;
4913 }
4914 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4915
4916 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4917 memset(tgt, 0, sizeof(*tgt));
4918 tgt->scsi_id = scsi_id;
4919 tgt->wwpn = wwpn;
4920 tgt->vhost = vhost;
4921 tgt->need_login = 1;
4922 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4923 kref_init(&tgt->kref);
4924 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4925 spin_lock_irqsave(vhost->host->host_lock, flags);
4926 tgt->cancel_key = vhost->task_set++;
4927 list_add_tail(&tgt->queue, &vhost->targets);
4928
4929 unlock_out:
4930 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4931 return 0;
4932 }
4933
4934 /**
4935 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4936 * @vhost: ibmvfc host struct
4937 *
4938 * Returns:
4939 * 0 on success / other on failure
4940 **/
4941 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4942 {
4943 int i, rc;
4944
4945 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4946 rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]);
4947
4948 return rc;
4949 }
4950
4951 /**
4952 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4953 * @evt: ibmvfc event struct
4954 *
4955 **/
4956 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4957 {
4958 struct ibmvfc_host *vhost = evt->vhost;
4959 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4960 u32 mad_status = be16_to_cpu(rsp->common.status);
4961 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4962
4963 switch (mad_status) {
4964 case IBMVFC_MAD_SUCCESS:
4965 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4966 vhost->num_targets = be32_to_cpu(rsp->num_written);
4967 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4968 break;
4969 case IBMVFC_MAD_FAILED:
4970 level += ibmvfc_retry_host_init(vhost);
4971 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4972 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4973 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4974 break;
4975 case IBMVFC_MAD_DRIVER_FAILED:
4976 break;
4977 default:
4978 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4979 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4980 break;
4981 }
4982
4983 ibmvfc_free_event(evt);
4984 wake_up(&vhost->work_wait_q);
4985 }
4986
4987 /**
4988 * ibmvfc_discover_targets - Send Discover Targets MAD
4989 * @vhost: ibmvfc host struct
4990 *
4991 **/
4992 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4993 {
4994 struct ibmvfc_discover_targets *mad;
4995 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4996 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4997
4998 if (!evt) {
4999 ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
5000 ibmvfc_hard_reset_host(vhost);
5001 return;
5002 }
5003
5004 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
5005 mad = &evt->iu.discover_targets;
5006 memset(mad, 0, sizeof(*mad));
5007 mad->common.version = cpu_to_be32(1);
5008 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5009 mad->common.length = cpu_to_be16(sizeof(*mad));
5010 mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5011 mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5012 mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5013 mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5014 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5015
5016 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5017 ibmvfc_dbg(vhost, "Sent discover targets\n");
5018 else
5019 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5020 }
5021
5022 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5023 {
5024 struct ibmvfc_host *vhost = evt->vhost;
5025 struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5026 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5027 u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5028 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5029 int flags, active_queues, i;
5030
5031 ibmvfc_free_event(evt);
5032
5033 switch (mad_status) {
5034 case IBMVFC_MAD_SUCCESS:
5035 ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5036 flags = be32_to_cpu(setup->flags);
5037 vhost->do_enquiry = 0;
5038 active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5039 scrqs->active_queues = active_queues;
5040
5041 if (flags & IBMVFC_CHANNELS_CANCELED) {
5042 ibmvfc_dbg(vhost, "Channels Canceled\n");
5043 vhost->using_channels = 0;
5044 } else {
5045 if (active_queues)
5046 vhost->using_channels = 1;
5047 for (i = 0; i < active_queues; i++)
5048 scrqs->scrqs[i].vios_cookie =
5049 be64_to_cpu(setup->channel_handles[i]);
5050
5051 ibmvfc_dbg(vhost, "Using %u channels\n",
5052 vhost->scsi_scrqs.active_queues);
5053 }
5054 break;
5055 case IBMVFC_MAD_FAILED:
5056 level += ibmvfc_retry_host_init(vhost);
5057 ibmvfc_log(vhost, level, "Channel Setup failed\n");
5058 fallthrough;
5059 case IBMVFC_MAD_DRIVER_FAILED:
5060 return;
5061 default:
5062 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5063 mad_status);
5064 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5065 return;
5066 }
5067
5068 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5069 wake_up(&vhost->work_wait_q);
5070 }
5071
5072 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5073 {
5074 struct ibmvfc_channel_setup_mad *mad;
5075 struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5076 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5077 struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5078 unsigned int num_channels =
5079 min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5080 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5081 int i;
5082
5083 if (!evt) {
5084 ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5085 ibmvfc_hard_reset_host(vhost);
5086 return;
5087 }
5088
5089 memset(setup_buf, 0, sizeof(*setup_buf));
5090 if (num_channels == 0)
5091 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5092 else {
5093 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5094 for (i = 0; i < num_channels; i++)
5095 setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5096 }
5097
5098 ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
5099 mad = &evt->iu.channel_setup;
5100 memset(mad, 0, sizeof(*mad));
5101 mad->common.version = cpu_to_be32(1);
5102 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5103 mad->common.length = cpu_to_be16(sizeof(*mad));
5104 mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5105 mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5106
5107 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5108
5109 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5110 ibmvfc_dbg(vhost, "Sent channel setup\n");
5111 else
5112 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
5113 }
5114
5115 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5116 {
5117 struct ibmvfc_host *vhost = evt->vhost;
5118 struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5119 u32 mad_status = be16_to_cpu(rsp->common.status);
5120 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5121
5122 switch (mad_status) {
5123 case IBMVFC_MAD_SUCCESS:
5124 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5125 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5126 ibmvfc_free_event(evt);
5127 break;
5128 case IBMVFC_MAD_FAILED:
5129 level += ibmvfc_retry_host_init(vhost);
5130 ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5131 fallthrough;
5132 case IBMVFC_MAD_DRIVER_FAILED:
5133 ibmvfc_free_event(evt);
5134 return;
5135 default:
5136 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5137 mad_status);
5138 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5139 ibmvfc_free_event(evt);
5140 return;
5141 }
5142
5143 ibmvfc_channel_setup(vhost);
5144 }
5145
5146 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5147 {
5148 struct ibmvfc_channel_enquiry *mad;
5149 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5150 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5151
5152 if (!evt) {
5153 ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5154 ibmvfc_hard_reset_host(vhost);
5155 return;
5156 }
5157
5158 ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5159 mad = &evt->iu.channel_enquiry;
5160 memset(mad, 0, sizeof(*mad));
5161 mad->common.version = cpu_to_be32(1);
5162 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5163 mad->common.length = cpu_to_be16(sizeof(*mad));
5164
5165 if (mig_channels_only)
5166 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5167 if (mig_no_less_channels)
5168 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5169
5170 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5171
5172 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5173 ibmvfc_dbg(vhost, "Send channel enquiry\n");
5174 else
5175 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5176 }
5177
5178 /**
5179 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5180 * @evt: ibmvfc event struct
5181 *
5182 **/
5183 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5184 {
5185 struct ibmvfc_host *vhost = evt->vhost;
5186 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5187 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5188 unsigned int npiv_max_sectors;
5189 int level = IBMVFC_DEFAULT_LOG_LEVEL;
5190
5191 switch (mad_status) {
5192 case IBMVFC_MAD_SUCCESS:
5193 ibmvfc_free_event(evt);
5194 break;
5195 case IBMVFC_MAD_FAILED:
5196 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5197 level += ibmvfc_retry_host_init(vhost);
5198 else
5199 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5200 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5201 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5202 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5203 ibmvfc_free_event(evt);
5204 return;
5205 case IBMVFC_MAD_CRQ_ERROR:
5206 ibmvfc_retry_host_init(vhost);
5207 fallthrough;
5208 case IBMVFC_MAD_DRIVER_FAILED:
5209 ibmvfc_free_event(evt);
5210 return;
5211 default:
5212 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5213 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5214 ibmvfc_free_event(evt);
5215 return;
5216 }
5217
5218 vhost->client_migrated = 0;
5219
5220 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5221 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5222 rsp->flags);
5223 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5224 wake_up(&vhost->work_wait_q);
5225 return;
5226 }
5227
5228 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5229 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5230 rsp->max_cmds);
5231 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5232 wake_up(&vhost->work_wait_q);
5233 return;
5234 }
5235
5236 vhost->logged_in = 1;
5237 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors);
5238 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5239 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5240 rsp->drc_name, npiv_max_sectors);
5241
5242 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5243 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5244 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5245 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5246 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5247 fc_host_supported_classes(vhost->host) = 0;
5248 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5249 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5250 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5251 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5252 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5253 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5254 fc_host_maxframe_size(vhost->host) =
5255 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5256
5257 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5258 vhost->host->max_sectors = npiv_max_sectors;
5259
5260 if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5261 ibmvfc_channel_enquiry(vhost);
5262 } else {
5263 vhost->do_enquiry = 0;
5264 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5265 wake_up(&vhost->work_wait_q);
5266 }
5267 }
5268
5269 /**
5270 * ibmvfc_npiv_login - Sends NPIV login
5271 * @vhost: ibmvfc host struct
5272 *
5273 **/
5274 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5275 {
5276 struct ibmvfc_npiv_login_mad *mad;
5277 struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5278
5279 if (!evt) {
5280 ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5281 ibmvfc_hard_reset_host(vhost);
5282 return;
5283 }
5284
5285 ibmvfc_gather_partition_info(vhost);
5286 ibmvfc_set_login_info(vhost);
5287 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5288
5289 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5290 mad = &evt->iu.npiv_login;
5291 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5292 mad->common.version = cpu_to_be32(1);
5293 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5294 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5295 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5296 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5297
5298 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5299
5300 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5301 ibmvfc_dbg(vhost, "Sent NPIV login\n");
5302 else
5303 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5304 }
5305
5306 /**
5307 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5308 * @evt: ibmvfc event struct
5309 *
5310 **/
5311 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5312 {
5313 struct ibmvfc_host *vhost = evt->vhost;
5314 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5315
5316 ibmvfc_free_event(evt);
5317
5318 switch (mad_status) {
5319 case IBMVFC_MAD_SUCCESS:
5320 if (list_empty(&vhost->crq.sent) &&
5321 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5322 ibmvfc_init_host(vhost);
5323 return;
5324 }
5325 break;
5326 case IBMVFC_MAD_FAILED:
5327 case IBMVFC_MAD_NOT_SUPPORTED:
5328 case IBMVFC_MAD_CRQ_ERROR:
5329 case IBMVFC_MAD_DRIVER_FAILED:
5330 default:
5331 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5332 break;
5333 }
5334
5335 ibmvfc_hard_reset_host(vhost);
5336 }
5337
5338 /**
5339 * ibmvfc_npiv_logout - Issue an NPIV Logout
5340 * @vhost: ibmvfc host struct
5341 *
5342 **/
5343 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5344 {
5345 struct ibmvfc_npiv_logout_mad *mad;
5346 struct ibmvfc_event *evt;
5347
5348 evt = ibmvfc_get_reserved_event(&vhost->crq);
5349 if (!evt) {
5350 ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5351 ibmvfc_hard_reset_host(vhost);
5352 return;
5353 }
5354
5355 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5356
5357 mad = &evt->iu.npiv_logout;
5358 memset(mad, 0, sizeof(*mad));
5359 mad->common.version = cpu_to_be32(1);
5360 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5361 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5362
5363 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5364
5365 if (!ibmvfc_send_event(evt, vhost, default_timeout))
5366 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5367 else
5368 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5369 }
5370
5371 /**
5372 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5373 * @vhost: ibmvfc host struct
5374 *
5375 * Returns:
5376 * 1 if work to do / 0 if not
5377 **/
5378 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5379 {
5380 struct ibmvfc_target *tgt;
5381
5382 list_for_each_entry(tgt, &vhost->targets, queue) {
5383 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5384 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5385 return 1;
5386 }
5387
5388 return 0;
5389 }
5390
5391 /**
5392 * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5393 * @vhost: ibmvfc host struct
5394 *
5395 * Returns:
5396 * 1 if work to do / 0 if not
5397 **/
5398 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5399 {
5400 struct ibmvfc_target *tgt;
5401
5402 list_for_each_entry(tgt, &vhost->targets, queue) {
5403 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5404 tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5405 return 1;
5406 }
5407 return 0;
5408 }
5409
5410 /**
5411 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5412 * @vhost: ibmvfc host struct
5413 *
5414 * Returns:
5415 * 1 if work to do / 0 if not
5416 **/
5417 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5418 {
5419 struct ibmvfc_target *tgt;
5420
5421 if (kthread_should_stop())
5422 return 1;
5423 switch (vhost->action) {
5424 case IBMVFC_HOST_ACTION_NONE:
5425 case IBMVFC_HOST_ACTION_INIT_WAIT:
5426 case IBMVFC_HOST_ACTION_LOGO_WAIT:
5427 return 0;
5428 case IBMVFC_HOST_ACTION_TGT_INIT:
5429 case IBMVFC_HOST_ACTION_QUERY_TGTS:
5430 if (vhost->discovery_threads == disc_threads)
5431 return 0;
5432 list_for_each_entry(tgt, &vhost->targets, queue)
5433 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5434 return 1;
5435 list_for_each_entry(tgt, &vhost->targets, queue)
5436 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5437 return 0;
5438 return 1;
5439 case IBMVFC_HOST_ACTION_TGT_DEL:
5440 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5441 if (vhost->discovery_threads == disc_threads)
5442 return 0;
5443 list_for_each_entry(tgt, &vhost->targets, queue)
5444 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5445 return 1;
5446 list_for_each_entry(tgt, &vhost->targets, queue)
5447 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5448 return 0;
5449 return 1;
5450 case IBMVFC_HOST_ACTION_LOGO:
5451 case IBMVFC_HOST_ACTION_INIT:
5452 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5453 case IBMVFC_HOST_ACTION_QUERY:
5454 case IBMVFC_HOST_ACTION_RESET:
5455 case IBMVFC_HOST_ACTION_REENABLE:
5456 default:
5457 break;
5458 }
5459
5460 return 1;
5461 }
5462
5463 /**
5464 * ibmvfc_work_to_do - Is there task level work to do?
5465 * @vhost: ibmvfc host struct
5466 *
5467 * Returns:
5468 * 1 if work to do / 0 if not
5469 **/
5470 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5471 {
5472 unsigned long flags;
5473 int rc;
5474
5475 spin_lock_irqsave(vhost->host->host_lock, flags);
5476 rc = __ibmvfc_work_to_do(vhost);
5477 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5478 return rc;
5479 }
5480
5481 /**
5482 * ibmvfc_log_ae - Log async events if necessary
5483 * @vhost: ibmvfc host struct
5484 * @events: events to log
5485 *
5486 **/
5487 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5488 {
5489 if (events & IBMVFC_AE_RSCN)
5490 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5491 if ((events & IBMVFC_AE_LINKDOWN) &&
5492 vhost->state >= IBMVFC_HALTED)
5493 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5494 if ((events & IBMVFC_AE_LINKUP) &&
5495 vhost->state == IBMVFC_INITIALIZING)
5496 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5497 }
5498
5499 /**
5500 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5501 * @tgt: ibmvfc target struct
5502 *
5503 **/
5504 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5505 {
5506 struct ibmvfc_host *vhost = tgt->vhost;
5507 struct fc_rport *rport;
5508 unsigned long flags;
5509
5510 tgt_dbg(tgt, "Adding rport\n");
5511 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5512 spin_lock_irqsave(vhost->host->host_lock, flags);
5513
5514 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5515 tgt_dbg(tgt, "Deleting rport\n");
5516 list_del(&tgt->queue);
5517 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5518 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5519 fc_remote_port_delete(rport);
5520 del_timer_sync(&tgt->timer);
5521 kref_put(&tgt->kref, ibmvfc_release_tgt);
5522 return;
5523 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5524 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5525 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5526 tgt->rport = NULL;
5527 tgt->init_retries = 0;
5528 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5529 fc_remote_port_delete(rport);
5530 return;
5531 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5532 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5533 return;
5534 }
5535
5536 if (rport) {
5537 tgt_dbg(tgt, "rport add succeeded\n");
5538 tgt->rport = rport;
5539 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5540 rport->supported_classes = 0;
5541 tgt->target_id = rport->scsi_target_id;
5542 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5543 rport->supported_classes |= FC_COS_CLASS1;
5544 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5545 rport->supported_classes |= FC_COS_CLASS2;
5546 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5547 rport->supported_classes |= FC_COS_CLASS3;
5548 } else
5549 tgt_dbg(tgt, "rport add failed\n");
5550 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5551 }
5552
5553 /**
5554 * ibmvfc_do_work - Do task level work
5555 * @vhost: ibmvfc host struct
5556 *
5557 **/
5558 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5559 {
5560 struct ibmvfc_target *tgt;
5561 unsigned long flags;
5562 struct fc_rport *rport;
5563 LIST_HEAD(purge);
5564 int rc;
5565
5566 ibmvfc_log_ae(vhost, vhost->events_to_log);
5567 spin_lock_irqsave(vhost->host->host_lock, flags);
5568 vhost->events_to_log = 0;
5569 switch (vhost->action) {
5570 case IBMVFC_HOST_ACTION_NONE:
5571 case IBMVFC_HOST_ACTION_LOGO_WAIT:
5572 case IBMVFC_HOST_ACTION_INIT_WAIT:
5573 break;
5574 case IBMVFC_HOST_ACTION_RESET:
5575 list_splice_init(&vhost->purge, &purge);
5576 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5577 ibmvfc_complete_purge(&purge);
5578 rc = ibmvfc_reset_crq(vhost);
5579
5580 spin_lock_irqsave(vhost->host->host_lock, flags);
5581 if (!rc || rc == H_CLOSED)
5582 vio_enable_interrupts(to_vio_dev(vhost->dev));
5583 if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5584 /*
5585 * The only action we could have changed to would have
5586 * been reenable, in which case, we skip the rest of
5587 * this path and wait until we've done the re-enable
5588 * before sending the crq init.
5589 */
5590 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5591
5592 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5593 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5594 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5595 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5596 }
5597 }
5598 break;
5599 case IBMVFC_HOST_ACTION_REENABLE:
5600 list_splice_init(&vhost->purge, &purge);
5601 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5602 ibmvfc_complete_purge(&purge);
5603 rc = ibmvfc_reenable_crq_queue(vhost);
5604
5605 spin_lock_irqsave(vhost->host->host_lock, flags);
5606 if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5607 /*
5608 * The only action we could have changed to would have
5609 * been reset, in which case, we skip the rest of this
5610 * path and wait until we've done the reset before
5611 * sending the crq init.
5612 */
5613 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5614 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5615 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5616 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5617 }
5618 }
5619 break;
5620 case IBMVFC_HOST_ACTION_LOGO:
5621 vhost->job_step(vhost);
5622 break;
5623 case IBMVFC_HOST_ACTION_INIT:
5624 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5625 if (vhost->delay_init) {
5626 vhost->delay_init = 0;
5627 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5628 ssleep(15);
5629 return;
5630 } else
5631 vhost->job_step(vhost);
5632 break;
5633 case IBMVFC_HOST_ACTION_QUERY:
5634 list_for_each_entry(tgt, &vhost->targets, queue)
5635 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5636 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5637 break;
5638 case IBMVFC_HOST_ACTION_QUERY_TGTS:
5639 list_for_each_entry(tgt, &vhost->targets, queue) {
5640 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5641 tgt->job_step(tgt);
5642 break;
5643 }
5644 }
5645
5646 if (!ibmvfc_dev_init_to_do(vhost))
5647 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5648 break;
5649 case IBMVFC_HOST_ACTION_TGT_DEL:
5650 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5651 list_for_each_entry(tgt, &vhost->targets, queue) {
5652 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5653 tgt->job_step(tgt);
5654 break;
5655 }
5656 }
5657
5658 if (ibmvfc_dev_logo_to_do(vhost)) {
5659 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5660 return;
5661 }
5662
5663 list_for_each_entry(tgt, &vhost->targets, queue) {
5664 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5665 tgt_dbg(tgt, "Deleting rport\n");
5666 rport = tgt->rport;
5667 tgt->rport = NULL;
5668 list_del(&tgt->queue);
5669 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5670 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5671 if (rport)
5672 fc_remote_port_delete(rport);
5673 del_timer_sync(&tgt->timer);
5674 kref_put(&tgt->kref, ibmvfc_release_tgt);
5675 return;
5676 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5677 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5678 rport = tgt->rport;
5679 tgt->rport = NULL;
5680 tgt->init_retries = 0;
5681 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5682
5683 /*
5684 * If fast fail is enabled, we wait for it to fire and then clean up
5685 * the old port, since we expect the fast fail timer to clean up the
5686 * outstanding I/O faster than waiting for normal command timeouts.
5687 * However, if fast fail is disabled, any I/O outstanding to the
5688 * rport LUNs will stay outstanding indefinitely, since the EH handlers
5689 * won't get invoked for I/O's timing out. If this is a NPIV failover
5690 * scenario, the better alternative is to use the move login.
5691 */
5692 if (rport && rport->fast_io_fail_tmo == -1)
5693 tgt->move_login = 1;
5694 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5695 if (rport)
5696 fc_remote_port_delete(rport);
5697 return;
5698 }
5699 }
5700
5701 if (vhost->state == IBMVFC_INITIALIZING) {
5702 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5703 if (vhost->reinit) {
5704 vhost->reinit = 0;
5705 scsi_block_requests(vhost->host);
5706 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5707 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5708 } else {
5709 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5710 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5711 wake_up(&vhost->init_wait_q);
5712 schedule_work(&vhost->rport_add_work_q);
5713 vhost->init_retries = 0;
5714 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5715 scsi_unblock_requests(vhost->host);
5716 }
5717
5718 return;
5719 } else {
5720 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5721 vhost->job_step = ibmvfc_discover_targets;
5722 }
5723 } else {
5724 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5725 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5726 scsi_unblock_requests(vhost->host);
5727 wake_up(&vhost->init_wait_q);
5728 return;
5729 }
5730 break;
5731 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5732 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5733 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5734 ibmvfc_alloc_targets(vhost);
5735 spin_lock_irqsave(vhost->host->host_lock, flags);
5736 break;
5737 case IBMVFC_HOST_ACTION_TGT_INIT:
5738 list_for_each_entry(tgt, &vhost->targets, queue) {
5739 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5740 tgt->job_step(tgt);
5741 break;
5742 }
5743 }
5744
5745 if (!ibmvfc_dev_init_to_do(vhost))
5746 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5747 break;
5748 default:
5749 break;
5750 }
5751
5752 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5753 }
5754
5755 /**
5756 * ibmvfc_work - Do task level work
5757 * @data: ibmvfc host struct
5758 *
5759 * Returns:
5760 * zero
5761 **/
5762 static int ibmvfc_work(void *data)
5763 {
5764 struct ibmvfc_host *vhost = data;
5765 int rc;
5766
5767 set_user_nice(current, MIN_NICE);
5768
5769 while (1) {
5770 rc = wait_event_interruptible(vhost->work_wait_q,
5771 ibmvfc_work_to_do(vhost));
5772
5773 BUG_ON(rc);
5774
5775 if (kthread_should_stop())
5776 break;
5777
5778 ibmvfc_do_work(vhost);
5779 }
5780
5781 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5782 return 0;
5783 }
5784
5785 /**
5786 * ibmvfc_alloc_queue - Allocate queue
5787 * @vhost: ibmvfc host struct
5788 * @queue: ibmvfc queue to allocate
5789 * @fmt: queue format to allocate
5790 *
5791 * Returns:
5792 * 0 on success / non-zero on failure
5793 **/
5794 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5795 struct ibmvfc_queue *queue,
5796 enum ibmvfc_msg_fmt fmt)
5797 {
5798 struct device *dev = vhost->dev;
5799 size_t fmt_size;
5800
5801 ENTER;
5802 spin_lock_init(&queue->_lock);
5803 queue->q_lock = &queue->_lock;
5804
5805 switch (fmt) {
5806 case IBMVFC_CRQ_FMT:
5807 fmt_size = sizeof(*queue->msgs.crq);
5808 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5809 queue->evt_depth = scsi_qdepth;
5810 queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5811 break;
5812 case IBMVFC_ASYNC_FMT:
5813 fmt_size = sizeof(*queue->msgs.async);
5814 break;
5815 case IBMVFC_SUB_CRQ_FMT:
5816 fmt_size = sizeof(*queue->msgs.scrq);
5817 /* We need one extra event for Cancel Commands */
5818 queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5819 queue->evt_depth = scsi_qdepth;
5820 queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5821 break;
5822 default:
5823 dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5824 return -EINVAL;
5825 }
5826
5827 queue->fmt = fmt;
5828 if (ibmvfc_init_event_pool(vhost, queue)) {
5829 dev_err(dev, "Couldn't initialize event pool.\n");
5830 return -ENOMEM;
5831 }
5832
5833 queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5834 if (!queue->msgs.handle)
5835 return -ENOMEM;
5836
5837 queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5838 DMA_BIDIRECTIONAL);
5839
5840 if (dma_mapping_error(dev, queue->msg_token)) {
5841 free_page((unsigned long)queue->msgs.handle);
5842 queue->msgs.handle = NULL;
5843 return -ENOMEM;
5844 }
5845
5846 queue->cur = 0;
5847 queue->size = PAGE_SIZE / fmt_size;
5848
5849 queue->vhost = vhost;
5850 return 0;
5851 }
5852
5853 /**
5854 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5855 * @vhost: ibmvfc host struct
5856 *
5857 * Allocates a page for messages, maps it for dma, and registers
5858 * the crq with the hypervisor.
5859 *
5860 * Return value:
5861 * zero on success / other on failure
5862 **/
5863 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5864 {
5865 int rc, retrc = -ENOMEM;
5866 struct device *dev = vhost->dev;
5867 struct vio_dev *vdev = to_vio_dev(dev);
5868 struct ibmvfc_queue *crq = &vhost->crq;
5869
5870 ENTER;
5871 if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5872 return -ENOMEM;
5873
5874 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5875 crq->msg_token, PAGE_SIZE);
5876
5877 if (rc == H_RESOURCE)
5878 /* maybe kexecing and resource is busy. try a reset */
5879 retrc = rc = ibmvfc_reset_crq(vhost);
5880
5881 if (rc == H_CLOSED)
5882 dev_warn(dev, "Partner adapter not ready\n");
5883 else if (rc) {
5884 dev_warn(dev, "Error %d opening adapter\n", rc);
5885 goto reg_crq_failed;
5886 }
5887
5888 retrc = 0;
5889
5890 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5891
5892 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5893 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5894 goto req_irq_failed;
5895 }
5896
5897 if ((rc = vio_enable_interrupts(vdev))) {
5898 dev_err(dev, "Error %d enabling interrupts\n", rc);
5899 goto req_irq_failed;
5900 }
5901
5902 LEAVE;
5903 return retrc;
5904
5905 req_irq_failed:
5906 tasklet_kill(&vhost->tasklet);
5907 do {
5908 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5909 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5910 reg_crq_failed:
5911 ibmvfc_free_queue(vhost, crq);
5912 return retrc;
5913 }
5914
5915 static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5916 struct ibmvfc_channels *channels,
5917 int index)
5918 {
5919 struct device *dev = vhost->dev;
5920 struct vio_dev *vdev = to_vio_dev(dev);
5921 struct ibmvfc_queue *scrq = &channels->scrqs[index];
5922 int rc = -ENOMEM;
5923
5924 ENTER;
5925
5926 rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5927 &scrq->cookie, &scrq->hw_irq);
5928
5929 /* H_CLOSED indicates successful register, but no CRQ partner */
5930 if (rc && rc != H_CLOSED) {
5931 dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5932 if (rc == H_PARAMETER)
5933 dev_warn_once(dev, "Firmware may not support MQ\n");
5934 goto reg_failed;
5935 }
5936
5937 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5938
5939 if (!scrq->irq) {
5940 rc = -EINVAL;
5941 dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5942 goto irq_failed;
5943 }
5944
5945 switch (channels->protocol) {
5946 case IBMVFC_PROTO_SCSI:
5947 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5948 vdev->unit_address, index);
5949 scrq->handler = ibmvfc_interrupt_mq;
5950 break;
5951 case IBMVFC_PROTO_NVME:
5952 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d",
5953 vdev->unit_address, index);
5954 scrq->handler = ibmvfc_interrupt_mq;
5955 break;
5956 default:
5957 dev_err(dev, "Unknown channel protocol (%d)\n",
5958 channels->protocol);
5959 goto irq_failed;
5960 }
5961
5962 rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq);
5963
5964 if (rc) {
5965 dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5966 irq_dispose_mapping(scrq->irq);
5967 goto irq_failed;
5968 }
5969
5970 scrq->hwq_id = index;
5971
5972 LEAVE;
5973 return 0;
5974
5975 irq_failed:
5976 do {
5977 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5978 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5979 reg_failed:
5980 LEAVE;
5981 return rc;
5982 }
5983
5984 static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5985 struct ibmvfc_channels *channels,
5986 int index)
5987 {
5988 struct device *dev = vhost->dev;
5989 struct vio_dev *vdev = to_vio_dev(dev);
5990 struct ibmvfc_queue *scrq = &channels->scrqs[index];
5991 long rc;
5992
5993 ENTER;
5994
5995 free_irq(scrq->irq, scrq);
5996 irq_dispose_mapping(scrq->irq);
5997 scrq->irq = 0;
5998
5999 do {
6000 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
6001 scrq->cookie);
6002 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6003
6004 if (rc)
6005 dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6006
6007 /* Clean out the queue */
6008 memset(scrq->msgs.crq, 0, PAGE_SIZE);
6009 scrq->cur = 0;
6010
6011 LEAVE;
6012 }
6013
6014 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6015 struct ibmvfc_channels *channels)
6016 {
6017 int i, j;
6018
6019 ENTER;
6020 if (!vhost->mq_enabled || !channels->scrqs)
6021 return;
6022
6023 for (i = 0; i < channels->max_queues; i++) {
6024 if (ibmvfc_register_channel(vhost, channels, i)) {
6025 for (j = i; j > 0; j--)
6026 ibmvfc_deregister_channel(vhost, channels, j - 1);
6027 vhost->do_enquiry = 0;
6028 return;
6029 }
6030 }
6031
6032 LEAVE;
6033 }
6034
6035 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6036 struct ibmvfc_channels *channels)
6037 {
6038 int i;
6039
6040 ENTER;
6041 if (!vhost->mq_enabled || !channels->scrqs)
6042 return;
6043
6044 for (i = 0; i < channels->max_queues; i++)
6045 ibmvfc_deregister_channel(vhost, channels, i);
6046
6047 LEAVE;
6048 }
6049
6050 static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6051 struct ibmvfc_channels *channels)
6052 {
6053 struct ibmvfc_queue *scrq;
6054 int i, j;
6055 int rc = 0;
6056
6057 channels->scrqs = kcalloc(channels->max_queues,
6058 sizeof(*channels->scrqs),
6059 GFP_KERNEL);
6060 if (!channels->scrqs)
6061 return -ENOMEM;
6062
6063 for (i = 0; i < channels->max_queues; i++) {
6064 scrq = &channels->scrqs[i];
6065 rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT);
6066 if (rc) {
6067 for (j = i; j > 0; j--) {
6068 scrq = &channels->scrqs[j - 1];
6069 ibmvfc_free_queue(vhost, scrq);
6070 }
6071 kfree(channels->scrqs);
6072 channels->scrqs = NULL;
6073 channels->active_queues = 0;
6074 return rc;
6075 }
6076 }
6077
6078 return rc;
6079 }
6080
6081 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6082 {
6083 ENTER;
6084 if (!vhost->mq_enabled)
6085 return;
6086
6087 if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) {
6088 vhost->do_enquiry = 0;
6089 vhost->mq_enabled = 0;
6090 return;
6091 }
6092
6093 ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
6094
6095 LEAVE;
6096 }
6097
6098 static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6099 struct ibmvfc_channels *channels)
6100 {
6101 struct ibmvfc_queue *scrq;
6102 int i;
6103
6104 if (channels->scrqs) {
6105 for (i = 0; i < channels->max_queues; i++) {
6106 scrq = &channels->scrqs[i];
6107 ibmvfc_free_queue(vhost, scrq);
6108 }
6109
6110 kfree(channels->scrqs);
6111 channels->scrqs = NULL;
6112 channels->active_queues = 0;
6113 }
6114 }
6115
6116 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6117 {
6118 ENTER;
6119 if (!vhost->scsi_scrqs.scrqs)
6120 return;
6121
6122 ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
6123
6124 ibmvfc_release_channels(vhost, &vhost->scsi_scrqs);
6125 LEAVE;
6126 }
6127
6128 static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6129 {
6130 dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf,
6131 channels->disc_buf_dma);
6132 }
6133
6134 /**
6135 * ibmvfc_free_mem - Free memory for vhost
6136 * @vhost: ibmvfc host struct
6137 *
6138 * Return value:
6139 * none
6140 **/
6141 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6142 {
6143 struct ibmvfc_queue *async_q = &vhost->async_crq;
6144
6145 ENTER;
6146 mempool_destroy(vhost->tgt_pool);
6147 kfree(vhost->trace);
6148 ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs);
6149 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
6150 vhost->login_buf, vhost->login_buf_dma);
6151 dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
6152 vhost->channel_setup_buf, vhost->channel_setup_dma);
6153 dma_pool_destroy(vhost->sg_pool);
6154 ibmvfc_free_queue(vhost, async_q);
6155 LEAVE;
6156 }
6157
6158 static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6159 {
6160 channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6161 channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz,
6162 &channels->disc_buf_dma, GFP_KERNEL);
6163
6164 if (!channels->disc_buf) {
6165 dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6166 (channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6167 return -ENOMEM;
6168 }
6169
6170 return 0;
6171 }
6172
6173 /**
6174 * ibmvfc_alloc_mem - Allocate memory for vhost
6175 * @vhost: ibmvfc host struct
6176 *
6177 * Return value:
6178 * 0 on success / non-zero on failure
6179 **/
6180 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6181 {
6182 struct ibmvfc_queue *async_q = &vhost->async_crq;
6183 struct device *dev = vhost->dev;
6184
6185 ENTER;
6186 if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
6187 dev_err(dev, "Couldn't allocate/map async queue.\n");
6188 goto nomem;
6189 }
6190
6191 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6192 SG_ALL * sizeof(struct srp_direct_buf),
6193 sizeof(struct srp_direct_buf), 0);
6194
6195 if (!vhost->sg_pool) {
6196 dev_err(dev, "Failed to allocate sg pool\n");
6197 goto unmap_async_crq;
6198 }
6199
6200 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
6201 &vhost->login_buf_dma, GFP_KERNEL);
6202
6203 if (!vhost->login_buf) {
6204 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6205 goto free_sg_pool;
6206 }
6207
6208 if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs))
6209 goto free_login_buffer;
6210
6211 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
6212 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
6213 atomic_set(&vhost->trace_index, -1);
6214
6215 if (!vhost->trace)
6216 goto free_scsi_disc_buffer;
6217
6218 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6219 sizeof(struct ibmvfc_target));
6220
6221 if (!vhost->tgt_pool) {
6222 dev_err(dev, "Couldn't allocate target memory pool\n");
6223 goto free_trace;
6224 }
6225
6226 vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6227 &vhost->channel_setup_dma,
6228 GFP_KERNEL);
6229
6230 if (!vhost->channel_setup_buf) {
6231 dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6232 goto free_tgt_pool;
6233 }
6234
6235 LEAVE;
6236 return 0;
6237
6238 free_tgt_pool:
6239 mempool_destroy(vhost->tgt_pool);
6240 free_trace:
6241 kfree(vhost->trace);
6242 free_scsi_disc_buffer:
6243 ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs);
6244 free_login_buffer:
6245 dma_free_coherent(dev, sizeof(*vhost->login_buf),
6246 vhost->login_buf, vhost->login_buf_dma);
6247 free_sg_pool:
6248 dma_pool_destroy(vhost->sg_pool);
6249 unmap_async_crq:
6250 ibmvfc_free_queue(vhost, async_q);
6251 nomem:
6252 LEAVE;
6253 return -ENOMEM;
6254 }
6255
6256 /**
6257 * ibmvfc_rport_add_thread - Worker thread for rport adds
6258 * @work: work struct
6259 *
6260 **/
6261 static void ibmvfc_rport_add_thread(struct work_struct *work)
6262 {
6263 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6264 rport_add_work_q);
6265 struct ibmvfc_target *tgt;
6266 struct fc_rport *rport;
6267 unsigned long flags;
6268 int did_work;
6269
6270 ENTER;
6271 spin_lock_irqsave(vhost->host->host_lock, flags);
6272 do {
6273 did_work = 0;
6274 if (vhost->state != IBMVFC_ACTIVE)
6275 break;
6276
6277 list_for_each_entry(tgt, &vhost->targets, queue) {
6278 if (tgt->add_rport) {
6279 did_work = 1;
6280 tgt->add_rport = 0;
6281 kref_get(&tgt->kref);
6282 rport = tgt->rport;
6283 if (!rport) {
6284 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6285 ibmvfc_tgt_add_rport(tgt);
6286 } else if (get_device(&rport->dev)) {
6287 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6288 tgt_dbg(tgt, "Setting rport roles\n");
6289 fc_remote_port_rolechg(rport, tgt->ids.roles);
6290 put_device(&rport->dev);
6291 } else {
6292 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6293 }
6294
6295 kref_put(&tgt->kref, ibmvfc_release_tgt);
6296 spin_lock_irqsave(vhost->host->host_lock, flags);
6297 break;
6298 }
6299 }
6300 } while(did_work);
6301
6302 if (vhost->state == IBMVFC_ACTIVE)
6303 vhost->scan_complete = 1;
6304 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6305 LEAVE;
6306 }
6307
6308 /**
6309 * ibmvfc_probe - Adapter hot plug add entry point
6310 * @vdev: vio device struct
6311 * @id: vio device id struct
6312 *
6313 * Return value:
6314 * 0 on success / non-zero on failure
6315 **/
6316 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6317 {
6318 struct ibmvfc_host *vhost;
6319 struct Scsi_Host *shost;
6320 struct device *dev = &vdev->dev;
6321 int rc = -ENOMEM;
6322 unsigned int online_cpus = num_online_cpus();
6323 unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6324
6325 ENTER;
6326 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6327 if (!shost) {
6328 dev_err(dev, "Couldn't allocate host data\n");
6329 goto out;
6330 }
6331
6332 shost->transportt = ibmvfc_transport_template;
6333 shost->can_queue = scsi_qdepth;
6334 shost->max_lun = max_lun;
6335 shost->max_id = max_targets;
6336 shost->max_sectors = max_sectors;
6337 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6338 shost->unique_id = shost->host_no;
6339 shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6340
6341 vhost = shost_priv(shost);
6342 INIT_LIST_HEAD(&vhost->targets);
6343 INIT_LIST_HEAD(&vhost->purge);
6344 sprintf(vhost->name, IBMVFC_NAME);
6345 vhost->host = shost;
6346 vhost->dev = dev;
6347 vhost->partition_number = -1;
6348 vhost->log_level = log_level;
6349 vhost->task_set = 1;
6350
6351 vhost->mq_enabled = mq_enabled;
6352 vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6353 vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6354 vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6355 vhost->using_channels = 0;
6356 vhost->do_enquiry = 1;
6357 vhost->scan_timeout = 0;
6358
6359 strcpy(vhost->partition_name, "UNKNOWN");
6360 init_waitqueue_head(&vhost->work_wait_q);
6361 init_waitqueue_head(&vhost->init_wait_q);
6362 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6363 mutex_init(&vhost->passthru_mutex);
6364
6365 if ((rc = ibmvfc_alloc_mem(vhost)))
6366 goto free_scsi_host;
6367
6368 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6369 shost->host_no);
6370
6371 if (IS_ERR(vhost->work_thread)) {
6372 dev_err(dev, "Couldn't create kernel thread: %ld\n",
6373 PTR_ERR(vhost->work_thread));
6374 rc = PTR_ERR(vhost->work_thread);
6375 goto free_host_mem;
6376 }
6377
6378 if ((rc = ibmvfc_init_crq(vhost))) {
6379 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6380 goto kill_kthread;
6381 }
6382
6383 if ((rc = scsi_add_host(shost, dev)))
6384 goto release_crq;
6385
6386 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6387
6388 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6389 &ibmvfc_trace_attr))) {
6390 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6391 goto remove_shost;
6392 }
6393
6394 ibmvfc_init_sub_crqs(vhost);
6395
6396 dev_set_drvdata(dev, vhost);
6397 spin_lock(&ibmvfc_driver_lock);
6398 list_add_tail(&vhost->queue, &ibmvfc_head);
6399 spin_unlock(&ibmvfc_driver_lock);
6400
6401 ibmvfc_send_crq_init(vhost);
6402 scsi_scan_host(shost);
6403 return 0;
6404
6405 remove_shost:
6406 scsi_remove_host(shost);
6407 release_crq:
6408 ibmvfc_release_crq_queue(vhost);
6409 kill_kthread:
6410 kthread_stop(vhost->work_thread);
6411 free_host_mem:
6412 ibmvfc_free_mem(vhost);
6413 free_scsi_host:
6414 scsi_host_put(shost);
6415 out:
6416 LEAVE;
6417 return rc;
6418 }
6419
6420 /**
6421 * ibmvfc_remove - Adapter hot plug remove entry point
6422 * @vdev: vio device struct
6423 *
6424 * Return value:
6425 * 0
6426 **/
6427 static void ibmvfc_remove(struct vio_dev *vdev)
6428 {
6429 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6430 LIST_HEAD(purge);
6431 unsigned long flags;
6432
6433 ENTER;
6434 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6435
6436 spin_lock_irqsave(vhost->host->host_lock, flags);
6437 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6438 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6439
6440 ibmvfc_wait_while_resetting(vhost);
6441 kthread_stop(vhost->work_thread);
6442 fc_remove_host(vhost->host);
6443 scsi_remove_host(vhost->host);
6444
6445 spin_lock_irqsave(vhost->host->host_lock, flags);
6446 ibmvfc_purge_requests(vhost, DID_ERROR);
6447 list_splice_init(&vhost->purge, &purge);
6448 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6449 ibmvfc_complete_purge(&purge);
6450 ibmvfc_release_sub_crqs(vhost);
6451 ibmvfc_release_crq_queue(vhost);
6452
6453 ibmvfc_free_mem(vhost);
6454 spin_lock(&ibmvfc_driver_lock);
6455 list_del(&vhost->queue);
6456 spin_unlock(&ibmvfc_driver_lock);
6457 scsi_host_put(vhost->host);
6458 LEAVE;
6459 }
6460
6461 /**
6462 * ibmvfc_resume - Resume from suspend
6463 * @dev: device struct
6464 *
6465 * We may have lost an interrupt across suspend/resume, so kick the
6466 * interrupt handler
6467 *
6468 */
6469 static int ibmvfc_resume(struct device *dev)
6470 {
6471 unsigned long flags;
6472 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6473 struct vio_dev *vdev = to_vio_dev(dev);
6474
6475 spin_lock_irqsave(vhost->host->host_lock, flags);
6476 vio_disable_interrupts(vdev);
6477 tasklet_schedule(&vhost->tasklet);
6478 spin_unlock_irqrestore(vhost->host->host_lock, flags);
6479 return 0;
6480 }
6481
6482 /**
6483 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6484 * @vdev: vio device struct
6485 *
6486 * Return value:
6487 * Number of bytes the driver will need to DMA map at the same time in
6488 * order to perform well.
6489 */
6490 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6491 {
6492 unsigned long pool_dma;
6493
6494 pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6495 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6496 }
6497
6498 static const struct vio_device_id ibmvfc_device_table[] = {
6499 {"fcp", "IBM,vfc-client"},
6500 { "", "" }
6501 };
6502 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6503
6504 static const struct dev_pm_ops ibmvfc_pm_ops = {
6505 .resume = ibmvfc_resume
6506 };
6507
6508 static struct vio_driver ibmvfc_driver = {
6509 .id_table = ibmvfc_device_table,
6510 .probe = ibmvfc_probe,
6511 .remove = ibmvfc_remove,
6512 .get_desired_dma = ibmvfc_get_desired_dma,
6513 .name = IBMVFC_NAME,
6514 .pm = &ibmvfc_pm_ops,
6515 };
6516
6517 static struct fc_function_template ibmvfc_transport_functions = {
6518 .show_host_fabric_name = 1,
6519 .show_host_node_name = 1,
6520 .show_host_port_name = 1,
6521 .show_host_supported_classes = 1,
6522 .show_host_port_type = 1,
6523 .show_host_port_id = 1,
6524 .show_host_maxframe_size = 1,
6525
6526 .get_host_port_state = ibmvfc_get_host_port_state,
6527 .show_host_port_state = 1,
6528
6529 .get_host_speed = ibmvfc_get_host_speed,
6530 .show_host_speed = 1,
6531
6532 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6533 .terminate_rport_io = ibmvfc_terminate_rport_io,
6534
6535 .show_rport_maxframe_size = 1,
6536 .show_rport_supported_classes = 1,
6537
6538 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6539 .show_rport_dev_loss_tmo = 1,
6540
6541 .get_starget_node_name = ibmvfc_get_starget_node_name,
6542 .show_starget_node_name = 1,
6543
6544 .get_starget_port_name = ibmvfc_get_starget_port_name,
6545 .show_starget_port_name = 1,
6546
6547 .get_starget_port_id = ibmvfc_get_starget_port_id,
6548 .show_starget_port_id = 1,
6549
6550 .max_bsg_segments = 1,
6551 .bsg_request = ibmvfc_bsg_request,
6552 .bsg_timeout = ibmvfc_bsg_timeout,
6553 };
6554
6555 /**
6556 * ibmvfc_module_init - Initialize the ibmvfc module
6557 *
6558 * Return value:
6559 * 0 on success / other on failure
6560 **/
6561 static int __init ibmvfc_module_init(void)
6562 {
6563 int min_max_sectors = PAGE_SIZE >> 9;
6564 int rc;
6565
6566 if (!firmware_has_feature(FW_FEATURE_VIO))
6567 return -ENODEV;
6568
6569 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6570 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6571
6572 /*
6573 * Range check the max_sectors module parameter. The upper bounds is
6574 * implicity checked since the parameter is a ushort.
6575 */
6576 if (max_sectors < min_max_sectors) {
6577 printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n",
6578 min_max_sectors);
6579 max_sectors = min_max_sectors;
6580 }
6581
6582 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6583 if (!ibmvfc_transport_template)
6584 return -ENOMEM;
6585
6586 rc = vio_register_driver(&ibmvfc_driver);
6587 if (rc)
6588 fc_release_transport(ibmvfc_transport_template);
6589 return rc;
6590 }
6591
6592 /**
6593 * ibmvfc_module_exit - Teardown the ibmvfc module
6594 *
6595 * Return value:
6596 * nothing
6597 **/
6598 static void __exit ibmvfc_module_exit(void)
6599 {
6600 vio_unregister_driver(&ibmvfc_driver);
6601 fc_release_transport(ibmvfc_transport_template);
6602 }
6603
6604 module_init(ibmvfc_module_init);
6605 module_exit(ibmvfc_module_exit);
Kernel DRM miscellaneous fixes and cross-tree changes