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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / s390 / scsi / zfcp_def.h
blob22649639230b25fc8a326ab0eb3938070a9fdb26
1 /*
2 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
4 *
5 * (C) Copyright IBM Corp. 2002, 2006
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #ifndef ZFCP_DEF_H
23 #define ZFCP_DEF_H
24
25 /*************************** INCLUDES *****************************************/
26
27 #include <linux/init.h>
28 #include <linux/moduleparam.h>
29 #include <linux/miscdevice.h>
30 #include <linux/major.h>
31 #include <linux/blkdev.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/mempool.h>
36 #include <linux/syscalls.h>
37 #include <linux/ioctl.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_tcq.h>
40 #include <scsi/scsi_cmnd.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_transport.h>
44 #include <scsi/scsi_transport_fc.h>
45 #include <asm/ccwdev.h>
46 #include <asm/qdio.h>
47 #include <asm/debug.h>
48 #include <asm/ebcdic.h>
49 #include "zfcp_fsf.h"
50
51
52 /********************* GENERAL DEFINES *********************************/
53
54 /* zfcp version number, it consists of major, minor, and patch-level number */
55 #define ZFCP_VERSION "4.8.0"
56
57 /**
58 * zfcp_sg_to_address - determine kernel address from struct scatterlist
59 * @list: struct scatterlist
60 * Return: kernel address
61 */
62 static inline void *
63 zfcp_sg_to_address(struct scatterlist *list)
64 {
65 return (void *) (page_address(list->page) + list->offset);
66 }
67
68 /**
69 * zfcp_address_to_sg - set up struct scatterlist from kernel address
70 * @address: kernel address
71 * @list: struct scatterlist
72 */
73 static inline void
74 zfcp_address_to_sg(void *address, struct scatterlist *list)
75 {
76 list->page = virt_to_page(address);
77 list->offset = ((unsigned long) address) & (PAGE_SIZE - 1);
78 }
79
80 #define REQUEST_LIST_SIZE 128
81
82 /********************* SCSI SPECIFIC DEFINES *********************************/
83 #define ZFCP_SCSI_ER_TIMEOUT (10*HZ)
84
85 /********************* CIO/QDIO SPECIFIC DEFINES *****************************/
86
87 /* Adapter Identification Parameters */
88 #define ZFCP_CONTROL_UNIT_TYPE 0x1731
89 #define ZFCP_CONTROL_UNIT_MODEL 0x03
90 #define ZFCP_DEVICE_TYPE 0x1732
91 #define ZFCP_DEVICE_MODEL 0x03
92 #define ZFCP_DEVICE_MODEL_PRIV 0x04
93
94 /* allow as many chained SBALs as are supported by hardware */
95 #define ZFCP_MAX_SBALS_PER_REQ FSF_MAX_SBALS_PER_REQ
96 #define ZFCP_MAX_SBALS_PER_CT_REQ FSF_MAX_SBALS_PER_REQ
97 #define ZFCP_MAX_SBALS_PER_ELS_REQ FSF_MAX_SBALS_PER_ELS_REQ
98
99 /* DMQ bug workaround: don't use last SBALE */
100 #define ZFCP_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
101
102 /* index of last SBALE (with respect to DMQ bug workaround) */
103 #define ZFCP_LAST_SBALE_PER_SBAL (ZFCP_MAX_SBALES_PER_SBAL - 1)
104
105 /* max. number of (data buffer) SBALEs in largest SBAL chain */
106 #define ZFCP_MAX_SBALES_PER_REQ \
107 (ZFCP_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
108 /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
109
110 #define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
111 /* max. number of (data buffer) SBALEs in largest SBAL chain
112 multiplied with number of sectors per 4k block */
113
114 /* FIXME(tune): free space should be one max. SBAL chain plus what? */
115 #define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
116 - (ZFCP_MAX_SBALS_PER_REQ + 4))
117
118 #define ZFCP_SBAL_TIMEOUT (5*HZ)
119
120 #define ZFCP_TYPE2_RECOVERY_TIME (8*HZ)
121
122 /* queue polling (values in microseconds) */
123 #define ZFCP_MAX_INPUT_THRESHOLD 5000 /* FIXME: tune */
124 #define ZFCP_MAX_OUTPUT_THRESHOLD 1000 /* FIXME: tune */
125 #define ZFCP_MIN_INPUT_THRESHOLD 1 /* ignored by QDIO layer */
126 #define ZFCP_MIN_OUTPUT_THRESHOLD 1 /* ignored by QDIO layer */
127
128 #define QDIO_SCSI_QFMT 1 /* 1 for FSF */
129
130 /********************* FSF SPECIFIC DEFINES *********************************/
131
132 #define ZFCP_ULP_INFO_VERSION 26
133 #define ZFCP_QTCB_VERSION FSF_QTCB_CURRENT_VERSION
134 /* ATTENTION: value must not be used by hardware */
135 #define FSF_QTCB_UNSOLICITED_STATUS 0x6305
136 #define ZFCP_STATUS_READ_FAILED_THRESHOLD 3
137 #define ZFCP_STATUS_READS_RECOM FSF_STATUS_READS_RECOM
138
139 /* Do 1st retry in 1 second, then double the timeout for each following retry */
140 #define ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP 100
141 #define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES 7
142
143 /* timeout value for "default timer" for fsf requests */
144 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
145
146 /*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
147
148 typedef unsigned long long wwn_t;
149 typedef unsigned long long fcp_lun_t;
150 /* data length field may be at variable position in FCP-2 FCP_CMND IU */
151 typedef unsigned int fcp_dl_t;
152
153 #define ZFCP_FC_SERVICE_CLASS_DEFAULT FSF_CLASS_3
154
155 /* timeout for name-server lookup (in seconds) */
156 #define ZFCP_NS_GID_PN_TIMEOUT 10
157
158 /* largest SCSI command we can process */
159 /* FCP-2 (FCP_CMND IU) allows up to (255-3+16) */
160 #define ZFCP_MAX_SCSI_CMND_LENGTH 255
161 /* maximum number of commands in LUN queue (tagged queueing) */
162 #define ZFCP_CMND_PER_LUN 32
163
164 /* task attribute values in FCP-2 FCP_CMND IU */
165 #define SIMPLE_Q 0
166 #define HEAD_OF_Q 1
167 #define ORDERED_Q 2
168 #define ACA_Q 4
169 #define UNTAGGED 5
170
171 /* task management flags in FCP-2 FCP_CMND IU */
172 #define FCP_CLEAR_ACA 0x40
173 #define FCP_TARGET_RESET 0x20
174 #define FCP_LOGICAL_UNIT_RESET 0x10
175 #define FCP_CLEAR_TASK_SET 0x04
176 #define FCP_ABORT_TASK_SET 0x02
177
178 #define FCP_CDB_LENGTH 16
179
180 #define ZFCP_DID_MASK 0x00FFFFFF
181
182 /* FCP(-2) FCP_CMND IU */
183 struct fcp_cmnd_iu {
184 fcp_lun_t fcp_lun; /* FCP logical unit number */
185 u8 crn; /* command reference number */
186 u8 reserved0:5; /* reserved */
187 u8 task_attribute:3; /* task attribute */
188 u8 task_management_flags; /* task management flags */
189 u8 add_fcp_cdb_length:6; /* additional FCP_CDB length */
190 u8 rddata:1; /* read data */
191 u8 wddata:1; /* write data */
192 u8 fcp_cdb[FCP_CDB_LENGTH];
193 } __attribute__((packed));
194
195 /* FCP(-2) FCP_RSP IU */
196 struct fcp_rsp_iu {
197 u8 reserved0[10];
198 union {
199 struct {
200 u8 reserved1:3;
201 u8 fcp_conf_req:1;
202 u8 fcp_resid_under:1;
203 u8 fcp_resid_over:1;
204 u8 fcp_sns_len_valid:1;
205 u8 fcp_rsp_len_valid:1;
206 } bits;
207 u8 value;
208 } validity;
209 u8 scsi_status;
210 u32 fcp_resid;
211 u32 fcp_sns_len;
212 u32 fcp_rsp_len;
213 } __attribute__((packed));
214
215
216 #define RSP_CODE_GOOD 0
217 #define RSP_CODE_LENGTH_MISMATCH 1
218 #define RSP_CODE_FIELD_INVALID 2
219 #define RSP_CODE_RO_MISMATCH 3
220 #define RSP_CODE_TASKMAN_UNSUPP 4
221 #define RSP_CODE_TASKMAN_FAILED 5
222
223 /* see fc-fs */
224 #define LS_RSCN 0x61040000
225 #define LS_LOGO 0x05000000
226 #define LS_PLOGI 0x03000000
227
228 struct fcp_rscn_head {
229 u8 command;
230 u8 page_length; /* always 0x04 */
231 u16 payload_len;
232 } __attribute__((packed));
233
234 struct fcp_rscn_element {
235 u8 reserved:2;
236 u8 event_qual:4;
237 u8 addr_format:2;
238 u32 nport_did:24;
239 } __attribute__((packed));
240
241 #define ZFCP_PORT_ADDRESS 0x0
242 #define ZFCP_AREA_ADDRESS 0x1
243 #define ZFCP_DOMAIN_ADDRESS 0x2
244 #define ZFCP_FABRIC_ADDRESS 0x3
245
246 #define ZFCP_PORTS_RANGE_PORT 0xFFFFFF
247 #define ZFCP_PORTS_RANGE_AREA 0xFFFF00
248 #define ZFCP_PORTS_RANGE_DOMAIN 0xFF0000
249 #define ZFCP_PORTS_RANGE_FABRIC 0x000000
250
251 #define ZFCP_NO_PORTS_PER_AREA 0x100
252 #define ZFCP_NO_PORTS_PER_DOMAIN 0x10000
253 #define ZFCP_NO_PORTS_PER_FABRIC 0x1000000
254
255 /* see fc-ph */
256 struct fcp_logo {
257 u32 command;
258 u32 nport_did;
259 wwn_t nport_wwpn;
260 } __attribute__((packed));
261
262 /*
263 * DBF stuff
264 */
265 #define ZFCP_DBF_TAG_SIZE 4
266
267 struct zfcp_dbf_dump {
268 u8 tag[ZFCP_DBF_TAG_SIZE];
269 u32 total_size; /* size of total dump data */
270 u32 offset; /* how much data has being already dumped */
271 u32 size; /* how much data comes with this record */
272 u8 data[]; /* dump data */
273 } __attribute__ ((packed));
274
275 /* FIXME: to be inflated when reworking the erp dbf */
276 struct zfcp_erp_dbf_record {
277 u8 dummy[16];
278 } __attribute__ ((packed));
279
280 struct zfcp_hba_dbf_record_response {
281 u32 fsf_command;
282 u64 fsf_reqid;
283 u32 fsf_seqno;
284 u64 fsf_issued;
285 u32 fsf_prot_status;
286 u32 fsf_status;
287 u8 fsf_prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
288 u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
289 u32 fsf_req_status;
290 u8 sbal_first;
291 u8 sbal_curr;
292 u8 sbal_last;
293 u8 pool;
294 u64 erp_action;
295 union {
296 struct {
297 u64 scsi_cmnd;
298 u64 scsi_serial;
299 } send_fcp;
300 struct {
301 u64 wwpn;
302 u32 d_id;
303 u32 port_handle;
304 } port;
305 struct {
306 u64 wwpn;
307 u64 fcp_lun;
308 u32 port_handle;
309 u32 lun_handle;
310 } unit;
311 struct {
312 u32 d_id;
313 u8 ls_code;
314 } send_els;
315 } data;
316 } __attribute__ ((packed));
317
318 struct zfcp_hba_dbf_record_status {
319 u8 failed;
320 u32 status_type;
321 u32 status_subtype;
322 struct fsf_queue_designator
323 queue_designator;
324 u32 payload_size;
325 #define ZFCP_DBF_UNSOL_PAYLOAD 80
326 #define ZFCP_DBF_UNSOL_PAYLOAD_SENSE_DATA_AVAIL 32
327 #define ZFCP_DBF_UNSOL_PAYLOAD_BIT_ERROR_THRESHOLD 56
328 #define ZFCP_DBF_UNSOL_PAYLOAD_FEATURE_UPDATE_ALERT 2 * sizeof(u32)
329 u8 payload[ZFCP_DBF_UNSOL_PAYLOAD];
330 } __attribute__ ((packed));
331
332 struct zfcp_hba_dbf_record_qdio {
333 u32 status;
334 u32 qdio_error;
335 u32 siga_error;
336 u8 sbal_index;
337 u8 sbal_count;
338 } __attribute__ ((packed));
339
340 struct zfcp_hba_dbf_record {
341 u8 tag[ZFCP_DBF_TAG_SIZE];
342 u8 tag2[ZFCP_DBF_TAG_SIZE];
343 union {
344 struct zfcp_hba_dbf_record_response response;
345 struct zfcp_hba_dbf_record_status status;
346 struct zfcp_hba_dbf_record_qdio qdio;
347 } type;
348 } __attribute__ ((packed));
349
350 struct zfcp_san_dbf_record_ct {
351 union {
352 struct {
353 u16 cmd_req_code;
354 u8 revision;
355 u8 gs_type;
356 u8 gs_subtype;
357 u8 options;
358 u16 max_res_size;
359 } request;
360 struct {
361 u16 cmd_rsp_code;
362 u8 revision;
363 u8 reason_code;
364 u8 reason_code_expl;
365 u8 vendor_unique;
366 } response;
367 } type;
368 u32 payload_size;
369 #define ZFCP_DBF_CT_PAYLOAD 24
370 u8 payload[ZFCP_DBF_CT_PAYLOAD];
371 } __attribute__ ((packed));
372
373 struct zfcp_san_dbf_record_els {
374 u8 ls_code;
375 u32 payload_size;
376 #define ZFCP_DBF_ELS_PAYLOAD 32
377 #define ZFCP_DBF_ELS_MAX_PAYLOAD 1024
378 u8 payload[ZFCP_DBF_ELS_PAYLOAD];
379 } __attribute__ ((packed));
380
381 struct zfcp_san_dbf_record {
382 u8 tag[ZFCP_DBF_TAG_SIZE];
383 u64 fsf_reqid;
384 u32 fsf_seqno;
385 u32 s_id;
386 u32 d_id;
387 union {
388 struct zfcp_san_dbf_record_ct ct;
389 struct zfcp_san_dbf_record_els els;
390 } type;
391 } __attribute__ ((packed));
392
393 struct zfcp_scsi_dbf_record {
394 u8 tag[ZFCP_DBF_TAG_SIZE];
395 u8 tag2[ZFCP_DBF_TAG_SIZE];
396 u32 scsi_id;
397 u32 scsi_lun;
398 u32 scsi_result;
399 u64 scsi_cmnd;
400 u64 scsi_serial;
401 #define ZFCP_DBF_SCSI_OPCODE 16
402 u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
403 u8 scsi_retries;
404 u8 scsi_allowed;
405 u64 fsf_reqid;
406 u32 fsf_seqno;
407 u64 fsf_issued;
408 union {
409 u64 old_fsf_reqid;
410 struct {
411 u8 rsp_validity;
412 u8 rsp_scsi_status;
413 u32 rsp_resid;
414 u8 rsp_code;
415 #define ZFCP_DBF_SCSI_FCP_SNS_INFO 16
416 #define ZFCP_DBF_SCSI_MAX_FCP_SNS_INFO 256
417 u32 sns_info_len;
418 u8 sns_info[ZFCP_DBF_SCSI_FCP_SNS_INFO];
419 } fcp;
420 } type;
421 } __attribute__ ((packed));
422
423 /*
424 * FC-FS stuff
425 */
426 #define R_A_TOV 10 /* seconds */
427 #define ZFCP_ELS_TIMEOUT (2 * R_A_TOV)
428
429 #define ZFCP_LS_RLS 0x0f
430 #define ZFCP_LS_ADISC 0x52
431 #define ZFCP_LS_RPS 0x56
432 #define ZFCP_LS_RSCN 0x61
433 #define ZFCP_LS_RNID 0x78
434
435 struct zfcp_ls_rjt_par {
436 u8 action;
437 u8 reason_code;
438 u8 reason_expl;
439 u8 vendor_unique;
440 } __attribute__ ((packed));
441
442 struct zfcp_ls_adisc {
443 u8 code;
444 u8 field[3];
445 u32 hard_nport_id;
446 u64 wwpn;
447 u64 wwnn;
448 u32 nport_id;
449 } __attribute__ ((packed));
450
451 struct zfcp_ls_adisc_acc {
452 u8 code;
453 u8 field[3];
454 u32 hard_nport_id;
455 u64 wwpn;
456 u64 wwnn;
457 u32 nport_id;
458 } __attribute__ ((packed));
459
460 struct zfcp_rc_entry {
461 u8 code;
462 const char *description;
463 };
464
465 /*
466 * FC-GS-2 stuff
467 */
468 #define ZFCP_CT_REVISION 0x01
469 #define ZFCP_CT_DIRECTORY_SERVICE 0xFC
470 #define ZFCP_CT_NAME_SERVER 0x02
471 #define ZFCP_CT_SYNCHRONOUS 0x00
472 #define ZFCP_CT_GID_PN 0x0121
473 #define ZFCP_CT_MAX_SIZE 0x1020
474 #define ZFCP_CT_ACCEPT 0x8002
475 #define ZFCP_CT_REJECT 0x8001
476
477 /*
478 * FC-GS-4 stuff
479 */
480 #define ZFCP_CT_TIMEOUT (3 * R_A_TOV)
481
482 /******************** LOGGING MACROS AND DEFINES *****************************/
483
484 /*
485 * Logging may be applied on certain kinds of driver operations
486 * independently. Additionally, different log-levels are supported for
487 * each of these areas.
488 */
489
490 #define ZFCP_NAME "zfcp"
491
492 /* independent log areas */
493 #define ZFCP_LOG_AREA_OTHER 0
494 #define ZFCP_LOG_AREA_SCSI 1
495 #define ZFCP_LOG_AREA_FSF 2
496 #define ZFCP_LOG_AREA_CONFIG 3
497 #define ZFCP_LOG_AREA_CIO 4
498 #define ZFCP_LOG_AREA_QDIO 5
499 #define ZFCP_LOG_AREA_ERP 6
500 #define ZFCP_LOG_AREA_FC 7
501
502 /* log level values*/
503 #define ZFCP_LOG_LEVEL_NORMAL 0
504 #define ZFCP_LOG_LEVEL_INFO 1
505 #define ZFCP_LOG_LEVEL_DEBUG 2
506 #define ZFCP_LOG_LEVEL_TRACE 3
507
508 /*
509 * this allows removal of logging code by the preprocessor
510 * (the most detailed log level still to be compiled in is specified,
511 * higher log levels are removed)
512 */
513 #define ZFCP_LOG_LEVEL_LIMIT ZFCP_LOG_LEVEL_TRACE
514
515 /* get "loglevel" nibble assignment */
516 #define ZFCP_GET_LOG_VALUE(zfcp_lognibble) \
517 ((atomic_read(&zfcp_data.loglevel) >> (zfcp_lognibble<<2)) & 0xF)
518
519 /* set "loglevel" nibble */
520 #define ZFCP_SET_LOG_NIBBLE(value, zfcp_lognibble) \
521 (value << (zfcp_lognibble << 2))
522
523 /* all log-level defaults are combined to generate initial log-level */
524 #define ZFCP_LOG_LEVEL_DEFAULTS \
525 (ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_OTHER) | \
526 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_SCSI) | \
527 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FSF) | \
528 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CONFIG) | \
529 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CIO) | \
530 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_QDIO) | \
531 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_ERP) | \
532 ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FC))
533
534 /* check whether we have the right level for logging */
535 #define ZFCP_LOG_CHECK(level) \
536 ((ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA)) >= level)
537
538 /* logging routine for zfcp */
539 #define _ZFCP_LOG(fmt, args...) \
540 printk(KERN_ERR ZFCP_NAME": %s(%d): " fmt, __FUNCTION__, \
541 __LINE__ , ##args)
542
543 #define ZFCP_LOG(level, fmt, args...) \
544 do { \
545 if (ZFCP_LOG_CHECK(level)) \
546 _ZFCP_LOG(fmt, ##args); \
547 } while (0)
548
549 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_NORMAL
550 # define ZFCP_LOG_NORMAL(fmt, args...) do { } while (0)
551 #else
552 # define ZFCP_LOG_NORMAL(fmt, args...) \
553 do { \
554 if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_NORMAL)) \
555 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
556 } while (0)
557 #endif
558
559 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_INFO
560 # define ZFCP_LOG_INFO(fmt, args...) do { } while (0)
561 #else
562 # define ZFCP_LOG_INFO(fmt, args...) \
563 do { \
564 if (ZFCP_LOG_CHECK(ZFCP_LOG_LEVEL_INFO)) \
565 printk(KERN_ERR ZFCP_NAME": " fmt, ##args); \
566 } while (0)
567 #endif
568
569 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_DEBUG
570 # define ZFCP_LOG_DEBUG(fmt, args...) do { } while (0)
571 #else
572 # define ZFCP_LOG_DEBUG(fmt, args...) \
573 ZFCP_LOG(ZFCP_LOG_LEVEL_DEBUG, fmt , ##args)
574 #endif
575
576 #if ZFCP_LOG_LEVEL_LIMIT < ZFCP_LOG_LEVEL_TRACE
577 # define ZFCP_LOG_TRACE(fmt, args...) do { } while (0)
578 #else
579 # define ZFCP_LOG_TRACE(fmt, args...) \
580 ZFCP_LOG(ZFCP_LOG_LEVEL_TRACE, fmt , ##args)
581 #endif
582
583 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
584
585 /*
586 * Note, the leftmost status byte is common among adapter, port
587 * and unit
588 */
589 #define ZFCP_COMMON_FLAGS 0xfff00000
590
591 /* common status bits */
592 #define ZFCP_STATUS_COMMON_REMOVE 0x80000000
593 #define ZFCP_STATUS_COMMON_RUNNING 0x40000000
594 #define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
595 #define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
596 #define ZFCP_STATUS_COMMON_OPENING 0x08000000
597 #define ZFCP_STATUS_COMMON_OPEN 0x04000000
598 #define ZFCP_STATUS_COMMON_CLOSING 0x02000000
599 #define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
600 #define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
601 #define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
602
603 /* adapter status */
604 #define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
605 #define ZFCP_STATUS_ADAPTER_REGISTERED 0x00000004
606 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
607 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
608 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP 0x00000020
609 #define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL 0x00000080
610 #define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
611 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
612 #define ZFCP_STATUS_ADAPTER_XPORT_OK 0x00000800
613
614 /* FC-PH/FC-GS well-known address identifiers for generic services */
615 #define ZFCP_DID_MANAGEMENT_SERVICE 0xFFFFFA
616 #define ZFCP_DID_TIME_SERVICE 0xFFFFFB
617 #define ZFCP_DID_DIRECTORY_SERVICE 0xFFFFFC
618 #define ZFCP_DID_ALIAS_SERVICE 0xFFFFF8
619 #define ZFCP_DID_KEY_DISTRIBUTION_SERVICE 0xFFFFF7
620
621 /* remote port status */
622 #define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
623 #define ZFCP_STATUS_PORT_DID_DID 0x00000002
624 #define ZFCP_STATUS_PORT_PHYS_CLOSING 0x00000004
625 #define ZFCP_STATUS_PORT_NO_WWPN 0x00000008
626 #define ZFCP_STATUS_PORT_NO_SCSI_ID 0x00000010
627 #define ZFCP_STATUS_PORT_INVALID_WWPN 0x00000020
628
629 /* for ports with well known addresses */
630 #define ZFCP_STATUS_PORT_WKA \
631 (ZFCP_STATUS_PORT_NO_WWPN | \
632 ZFCP_STATUS_PORT_NO_SCSI_ID)
633
634 /* logical unit status */
635 #define ZFCP_STATUS_UNIT_NOTSUPPUNITRESET 0x00000001
636 #define ZFCP_STATUS_UNIT_TEMPORARY 0x00000002
637 #define ZFCP_STATUS_UNIT_SHARED 0x00000004
638 #define ZFCP_STATUS_UNIT_READONLY 0x00000008
639 #define ZFCP_STATUS_UNIT_REGISTERED 0x00000010
640 #define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING 0x00000020
641
642 /* FSF request status (this does not have a common part) */
643 #define ZFCP_STATUS_FSFREQ_NOT_INIT 0x00000000
644 #define ZFCP_STATUS_FSFREQ_POOL 0x00000001
645 #define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT 0x00000002
646 #define ZFCP_STATUS_FSFREQ_COMPLETED 0x00000004
647 #define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
648 #define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
649 #define ZFCP_STATUS_FSFREQ_ABORTING 0x00000020
650 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
651 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
652 #define ZFCP_STATUS_FSFREQ_ABORTED 0x00000100
653 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
654 #define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP 0x00000400
655 #define ZFCP_STATUS_FSFREQ_RETRY 0x00000800
656 #define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
657
658 /*********************** ERROR RECOVERY PROCEDURE DEFINES ********************/
659
660 #define ZFCP_MAX_ERPS 3
661
662 #define ZFCP_ERP_FSFREQ_TIMEOUT (30 * HZ)
663 #define ZFCP_ERP_MEMWAIT_TIMEOUT HZ
664
665 #define ZFCP_STATUS_ERP_TIMEDOUT 0x10000000
666 #define ZFCP_STATUS_ERP_CLOSE_ONLY 0x01000000
667 #define ZFCP_STATUS_ERP_DISMISSING 0x00100000
668 #define ZFCP_STATUS_ERP_DISMISSED 0x00200000
669 #define ZFCP_STATUS_ERP_LOWMEM 0x00400000
670
671 #define ZFCP_ERP_STEP_UNINITIALIZED 0x00000000
672 #define ZFCP_ERP_STEP_FSF_XCONFIG 0x00000001
673 #define ZFCP_ERP_STEP_PHYS_PORT_CLOSING 0x00000010
674 #define ZFCP_ERP_STEP_PORT_CLOSING 0x00000100
675 #define ZFCP_ERP_STEP_NAMESERVER_OPEN 0x00000200
676 #define ZFCP_ERP_STEP_NAMESERVER_LOOKUP 0x00000400
677 #define ZFCP_ERP_STEP_PORT_OPENING 0x00000800
678 #define ZFCP_ERP_STEP_UNIT_CLOSING 0x00001000
679 #define ZFCP_ERP_STEP_UNIT_OPENING 0x00002000
680
681 /* Ordered by escalation level (necessary for proper erp-code operation) */
682 #define ZFCP_ERP_ACTION_REOPEN_ADAPTER 0x4
683 #define ZFCP_ERP_ACTION_REOPEN_PORT_FORCED 0x3
684 #define ZFCP_ERP_ACTION_REOPEN_PORT 0x2
685 #define ZFCP_ERP_ACTION_REOPEN_UNIT 0x1
686
687 #define ZFCP_ERP_ACTION_RUNNING 0x1
688 #define ZFCP_ERP_ACTION_READY 0x2
689
690 #define ZFCP_ERP_SUCCEEDED 0x0
691 #define ZFCP_ERP_FAILED 0x1
692 #define ZFCP_ERP_CONTINUES 0x2
693 #define ZFCP_ERP_EXIT 0x3
694 #define ZFCP_ERP_DISMISSED 0x4
695 #define ZFCP_ERP_NOMEM 0x5
696
697
698 /******************** CFDC SPECIFIC STUFF *****************************/
699
700 /* Firewall data channel sense data record */
701 struct zfcp_cfdc_sense_data {
702 u32 signature; /* Request signature */
703 u32 devno; /* FCP adapter device number */
704 u32 command; /* Command code */
705 u32 fsf_status; /* FSF request status and status qualifier */
706 u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
707 u8 payloads[256]; /* Access conflicts list */
708 u8 control_file[0]; /* Access control table */
709 };
710
711 #define ZFCP_CFDC_SIGNATURE 0xCFDCACDF
712
713 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
714 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
715 #define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
716 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
717 #define ZFCP_CFDC_CMND_UPLOAD 0x00010002
718
719 #define ZFCP_CFDC_DOWNLOAD 0x00000001
720 #define ZFCP_CFDC_UPLOAD 0x00000002
721 #define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
722
723 #define ZFCP_CFDC_DEV_NAME "zfcp_cfdc"
724 #define ZFCP_CFDC_DEV_MAJOR MISC_MAJOR
725 #define ZFCP_CFDC_DEV_MINOR MISC_DYNAMIC_MINOR
726
727 #define ZFCP_CFDC_MAX_CONTROL_FILE_SIZE 127 * 1024
728
729 /************************* STRUCTURE DEFINITIONS *****************************/
730
731 struct zfcp_fsf_req;
732
733 /* holds various memory pools of an adapter */
734 struct zfcp_adapter_mempool {
735 mempool_t *fsf_req_erp;
736 mempool_t *fsf_req_scsi;
737 mempool_t *fsf_req_abort;
738 mempool_t *fsf_req_status_read;
739 mempool_t *data_status_read;
740 mempool_t *data_gid_pn;
741 };
742
743 /*
744 * header for CT_IU
745 */
746 struct ct_hdr {
747 u8 revision; // 0x01
748 u8 in_id[3]; // 0x00
749 u8 gs_type; // 0xFC Directory Service
750 u8 gs_subtype; // 0x02 Name Server
751 u8 options; // 0x00 single bidirectional exchange
752 u8 reserved0;
753 u16 cmd_rsp_code; // 0x0121 GID_PN, or 0x0100 GA_NXT
754 u16 max_res_size; // <= (4096 - 16) / 4
755 u8 reserved1;
756 u8 reason_code;
757 u8 reason_code_expl;
758 u8 vendor_unique;
759 } __attribute__ ((packed));
760
761 /* nameserver request CT_IU -- for requests where
762 * a port name is required */
763 struct ct_iu_gid_pn_req {
764 struct ct_hdr header;
765 wwn_t wwpn;
766 } __attribute__ ((packed));
767
768 /* FS_ACC IU and data unit for GID_PN nameserver request */
769 struct ct_iu_gid_pn_resp {
770 struct ct_hdr header;
771 u32 d_id;
772 } __attribute__ ((packed));
773
774 typedef void (*zfcp_send_ct_handler_t)(unsigned long);
775
776 /**
777 * struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
778 * @port: port where the request is sent to
779 * @req: scatter-gather list for request
780 * @resp: scatter-gather list for response
781 * @req_count: number of elements in request scatter-gather list
782 * @resp_count: number of elements in response scatter-gather list
783 * @handler: handler function (called for response to the request)
784 * @handler_data: data passed to handler function
785 * @pool: pointer to memory pool for ct request structure
786 * @timeout: FSF timeout for this request
787 * @completion: completion for synchronization purposes
788 * @status: used to pass error status to calling function
789 */
790 struct zfcp_send_ct {
791 struct zfcp_port *port;
792 struct scatterlist *req;
793 struct scatterlist *resp;
794 unsigned int req_count;
795 unsigned int resp_count;
796 zfcp_send_ct_handler_t handler;
797 unsigned long handler_data;
798 mempool_t *pool;
799 int timeout;
800 struct completion *completion;
801 int status;
802 };
803
804 /* used for name server requests in error recovery */
805 struct zfcp_gid_pn_data {
806 struct zfcp_send_ct ct;
807 struct scatterlist req;
808 struct scatterlist resp;
809 struct ct_iu_gid_pn_req ct_iu_req;
810 struct ct_iu_gid_pn_resp ct_iu_resp;
811 struct zfcp_port *port;
812 };
813
814 typedef void (*zfcp_send_els_handler_t)(unsigned long);
815
816 /**
817 * struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
818 * @adapter: adapter where request is sent from
819 * @port: port where ELS is destinated (port reference count has to be increased)
820 * @d_id: destiniation id of port where request is sent to
821 * @req: scatter-gather list for request
822 * @resp: scatter-gather list for response
823 * @req_count: number of elements in request scatter-gather list
824 * @resp_count: number of elements in response scatter-gather list
825 * @handler: handler function (called for response to the request)
826 * @handler_data: data passed to handler function
827 * @completion: completion for synchronization purposes
828 * @ls_code: hex code of ELS command
829 * @status: used to pass error status to calling function
830 */
831 struct zfcp_send_els {
832 struct zfcp_adapter *adapter;
833 struct zfcp_port *port;
834 u32 d_id;
835 struct scatterlist *req;
836 struct scatterlist *resp;
837 unsigned int req_count;
838 unsigned int resp_count;
839 zfcp_send_els_handler_t handler;
840 unsigned long handler_data;
841 struct completion *completion;
842 int ls_code;
843 int status;
844 };
845
846 struct zfcp_qdio_queue {
847 struct qdio_buffer *buffer[QDIO_MAX_BUFFERS_PER_Q]; /* SBALs */
848 u8 free_index; /* index of next free bfr
849 in queue (free_count>0) */
850 atomic_t free_count; /* number of free buffers
851 in queue */
852 rwlock_t queue_lock; /* lock for operations on queue */
853 int distance_from_int; /* SBALs used since PCI indication
854 was last set */
855 };
856
857 struct zfcp_erp_action {
858 struct list_head list;
859 int action; /* requested action code */
860 struct zfcp_adapter *adapter; /* device which should be recovered */
861 struct zfcp_port *port;
862 struct zfcp_unit *unit;
863 volatile u32 status; /* recovery status */
864 u32 step; /* active step of this erp action */
865 struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
866 for this action */
867 struct timer_list timer;
868 };
869
870
871 struct zfcp_adapter {
872 struct list_head list; /* list of adapters */
873 atomic_t refcount; /* reference count */
874 wait_queue_head_t remove_wq; /* can be used to wait for
875 refcount drop to zero */
876 wwn_t peer_wwnn; /* P2P peer WWNN */
877 wwn_t peer_wwpn; /* P2P peer WWPN */
878 u32 peer_d_id; /* P2P peer D_ID */
879 struct ccw_device *ccw_device; /* S/390 ccw device */
880 u32 hydra_version; /* Hydra version */
881 u32 fsf_lic_version;
882 u32 adapter_features; /* FCP channel features */
883 u32 connection_features; /* host connection features */
884 u32 hardware_version; /* of FCP channel */
885 struct Scsi_Host *scsi_host; /* Pointer to mid-layer */
886 struct list_head port_list_head; /* remote port list */
887 struct list_head port_remove_lh; /* head of ports to be
888 removed */
889 u32 ports; /* number of remote ports */
890 atomic_t reqs_active; /* # active FSF reqs */
891 unsigned long req_no; /* unique FSF req number */
892 struct list_head *req_list; /* list of pending reqs */
893 spinlock_t req_list_lock; /* request list lock */
894 struct zfcp_qdio_queue request_queue; /* request queue */
895 u32 fsf_req_seq_no; /* FSF cmnd seq number */
896 wait_queue_head_t request_wq; /* can be used to wait for
897 more avaliable SBALs */
898 struct zfcp_qdio_queue response_queue; /* response queue */
899 rwlock_t abort_lock; /* Protects against SCSI
900 stack abort/command
901 completion races */
902 u16 status_read_failed; /* # failed status reads */
903 atomic_t status; /* status of this adapter */
904 struct list_head erp_ready_head; /* error recovery for this
905 adapter/devices */
906 struct list_head erp_running_head;
907 rwlock_t erp_lock;
908 struct semaphore erp_ready_sem;
909 wait_queue_head_t erp_thread_wqh;
910 wait_queue_head_t erp_done_wqh;
911 struct zfcp_erp_action erp_action; /* pending error recovery */
912 atomic_t erp_counter;
913 u32 erp_total_count; /* total nr of enqueued erp
914 actions */
915 u32 erp_low_mem_count; /* nr of erp actions waiting
916 for memory */
917 struct zfcp_port *nameserver_port; /* adapter's nameserver */
918 debug_info_t *erp_dbf;
919 debug_info_t *hba_dbf;
920 debug_info_t *san_dbf; /* debug feature areas */
921 debug_info_t *scsi_dbf;
922 spinlock_t erp_dbf_lock;
923 spinlock_t hba_dbf_lock;
924 spinlock_t san_dbf_lock;
925 spinlock_t scsi_dbf_lock;
926 struct zfcp_erp_dbf_record erp_dbf_buf;
927 struct zfcp_hba_dbf_record hba_dbf_buf;
928 struct zfcp_san_dbf_record san_dbf_buf;
929 struct zfcp_scsi_dbf_record scsi_dbf_buf;
930 struct zfcp_adapter_mempool pool; /* Adapter memory pools */
931 struct qdio_initialize qdio_init_data; /* for qdio_establish */
932 struct device generic_services; /* directory for WKA ports */
933 struct fc_host_statistics *fc_stats;
934 struct fsf_qtcb_bottom_port *stats_reset_data;
935 unsigned long stats_reset;
936 };
937
938 /*
939 * the struct device sysfs_device must be at the beginning of this structure.
940 * pointer to struct device is used to free port structure in release function
941 * of the device. don't change!
942 */
943 struct zfcp_port {
944 struct device sysfs_device; /* sysfs device */
945 struct fc_rport *rport; /* rport of fc transport class */
946 struct list_head list; /* list of remote ports */
947 atomic_t refcount; /* reference count */
948 wait_queue_head_t remove_wq; /* can be used to wait for
949 refcount drop to zero */
950 struct zfcp_adapter *adapter; /* adapter used to access port */
951 struct list_head unit_list_head; /* head of logical unit list */
952 struct list_head unit_remove_lh; /* head of luns to be removed
953 list */
954 u32 units; /* # of logical units in list */
955 atomic_t status; /* status of this remote port */
956 wwn_t wwnn; /* WWNN if known */
957 wwn_t wwpn; /* WWPN */
958 u32 d_id; /* D_ID */
959 u32 handle; /* handle assigned by FSF */
960 struct zfcp_erp_action erp_action; /* pending error recovery */
961 atomic_t erp_counter;
962 u32 maxframe_size;
963 u32 supported_classes;
964 };
965
966 /* the struct device sysfs_device must be at the beginning of this structure.
967 * pointer to struct device is used to free unit structure in release function
968 * of the device. don't change!
969 */
970 struct zfcp_unit {
971 struct device sysfs_device; /* sysfs device */
972 struct list_head list; /* list of logical units */
973 atomic_t refcount; /* reference count */
974 wait_queue_head_t remove_wq; /* can be used to wait for
975 refcount drop to zero */
976 struct zfcp_port *port; /* remote port of unit */
977 atomic_t status; /* status of this logical unit */
978 unsigned int scsi_lun; /* own SCSI LUN */
979 fcp_lun_t fcp_lun; /* own FCP_LUN */
980 u32 handle; /* handle assigned by FSF */
981 struct scsi_device *device; /* scsi device struct pointer */
982 struct zfcp_erp_action erp_action; /* pending error recovery */
983 atomic_t erp_counter;
984 wait_queue_head_t scsi_scan_wq; /* can be used to wait until
985 all scsi_scan_target
986 requests have been
987 completed. */
988 };
989
990 /* FSF request */
991 struct zfcp_fsf_req {
992 struct list_head list; /* list of FSF requests */
993 unsigned long req_id; /* unique request ID */
994 struct zfcp_adapter *adapter; /* adapter request belongs to */
995 u8 sbal_number; /* nr of SBALs free for use */
996 u8 sbal_first; /* first SBAL for this request */
997 u8 sbal_last; /* last possible SBAL for
998 this reuest */
999 u8 sbal_curr; /* current SBAL during creation
1000 of request */
1001 u8 sbale_curr; /* current SBALE during creation
1002 of request */
1003 wait_queue_head_t completion_wq; /* can be used by a routine
1004 to wait for completion */
1005 volatile u32 status; /* status of this request */
1006 u32 fsf_command; /* FSF Command copy */
1007 struct fsf_qtcb *qtcb; /* address of associated QTCB */
1008 u32 seq_no; /* Sequence number of request */
1009 unsigned long data; /* private data of request */
1010 struct timer_list timer; /* used for erp or scsi er */
1011 struct zfcp_erp_action *erp_action; /* used if this request is
1012 issued on behalf of erp */
1013 mempool_t *pool; /* used if request was alloacted
1014 from emergency pool */
1015 unsigned long long issued; /* request sent time (STCK) */
1016 struct zfcp_unit *unit;
1017 };
1018
1019 typedef void zfcp_fsf_req_handler_t(struct zfcp_fsf_req*);
1020
1021 /* driver data */
1022 struct zfcp_data {
1023 struct scsi_host_template scsi_host_template;
1024 struct scsi_transport_template *scsi_transport_template;
1025 atomic_t status; /* Module status flags */
1026 struct list_head adapter_list_head; /* head of adapter list */
1027 struct list_head adapter_remove_lh; /* head of adapters to be
1028 removed */
1029 u32 adapters; /* # of adapters in list */
1030 rwlock_t config_lock; /* serialises changes
1031 to adapter/port/unit
1032 lists */
1033 struct semaphore config_sema; /* serialises configuration
1034 changes */
1035 atomic_t loglevel; /* current loglevel */
1036 char init_busid[BUS_ID_SIZE];
1037 wwn_t init_wwpn;
1038 fcp_lun_t init_fcp_lun;
1039 char *driver_version;
1040 struct kmem_cache *fsf_req_qtcb_cache;
1041 struct kmem_cache *sr_buffer_cache;
1042 struct kmem_cache *gid_pn_cache;
1043 };
1044
1045 /**
1046 * struct zfcp_sg_list - struct describing a scatter-gather list
1047 * @sg: pointer to array of (struct scatterlist)
1048 * @count: number of elements in scatter-gather list
1049 */
1050 struct zfcp_sg_list {
1051 struct scatterlist *sg;
1052 unsigned int count;
1053 };
1054
1055 /* number of elements for various memory pools */
1056 #define ZFCP_POOL_FSF_REQ_ERP_NR 1
1057 #define ZFCP_POOL_FSF_REQ_SCSI_NR 1
1058 #define ZFCP_POOL_FSF_REQ_ABORT_NR 1
1059 #define ZFCP_POOL_STATUS_READ_NR ZFCP_STATUS_READS_RECOM
1060 #define ZFCP_POOL_DATA_GID_PN_NR 1
1061
1062 /* struct used by memory pools for fsf_requests */
1063 struct zfcp_fsf_req_qtcb {
1064 struct zfcp_fsf_req fsf_req;
1065 struct fsf_qtcb qtcb;
1066 };
1067
1068 /********************** ZFCP SPECIFIC DEFINES ********************************/
1069
1070 #define ZFCP_REQ_AUTO_CLEANUP 0x00000002
1071 #define ZFCP_WAIT_FOR_SBAL 0x00000004
1072 #define ZFCP_REQ_NO_QTCB 0x00000008
1073
1074 #define ZFCP_SET 0x00000100
1075 #define ZFCP_CLEAR 0x00000200
1076
1077 #ifndef atomic_test_mask
1078 #define atomic_test_mask(mask, target) \
1079 ((atomic_read(target) & mask) == mask)
1080 #endif
1081
1082 extern void _zfcp_hex_dump(char *, int);
1083 #define ZFCP_HEX_DUMP(level, addr, count) \
1084 if (ZFCP_LOG_CHECK(level)) { \
1085 _zfcp_hex_dump(addr, count); \
1086 }
1087
1088 #define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
1089 #define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
1090 #define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))
1091
1092 /*
1093 * Helper functions for request ID management.
1094 */
1095 static inline int zfcp_reqlist_hash(unsigned long req_id)
1096 {
1097 return req_id % REQUEST_LIST_SIZE;
1098 }
1099
1100 static inline void zfcp_reqlist_add(struct zfcp_adapter *adapter,
1101 struct zfcp_fsf_req *fsf_req)
1102 {
1103 unsigned int idx;
1104
1105 idx = zfcp_reqlist_hash(fsf_req->req_id);
1106 list_add_tail(&fsf_req->list, &adapter->req_list[idx]);
1107 }
1108
1109 static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
1110 struct zfcp_fsf_req *fsf_req)
1111 {
1112 list_del(&fsf_req->list);
1113 }
1114
1115 static inline struct zfcp_fsf_req *
1116 zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
1117 {
1118 struct zfcp_fsf_req *request;
1119 unsigned int idx;
1120
1121 idx = zfcp_reqlist_hash(req_id);
1122 list_for_each_entry(request, &adapter->req_list[idx], list)
1123 if (request->req_id == req_id)
1124 return request;
1125 return NULL;
1126 }
1127
1128 /*
1129 * functions needed for reference/usage counting
1130 */
1131
1132 static inline void
1133 zfcp_unit_get(struct zfcp_unit *unit)
1134 {
1135 atomic_inc(&unit->refcount);
1136 }
1137
1138 static inline void
1139 zfcp_unit_put(struct zfcp_unit *unit)
1140 {
1141 if (atomic_dec_return(&unit->refcount) == 0)
1142 wake_up(&unit->remove_wq);
1143 }
1144
1145 static inline void
1146 zfcp_unit_wait(struct zfcp_unit *unit)
1147 {
1148 wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
1149 }
1150
1151 static inline void
1152 zfcp_port_get(struct zfcp_port *port)
1153 {
1154 atomic_inc(&port->refcount);
1155 }
1156
1157 static inline void
1158 zfcp_port_put(struct zfcp_port *port)
1159 {
1160 if (atomic_dec_return(&port->refcount) == 0)
1161 wake_up(&port->remove_wq);
1162 }
1163
1164 static inline void
1165 zfcp_port_wait(struct zfcp_port *port)
1166 {
1167 wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
1168 }
1169
1170 static inline void
1171 zfcp_adapter_get(struct zfcp_adapter *adapter)
1172 {
1173 atomic_inc(&adapter->refcount);
1174 }
1175
1176 static inline void
1177 zfcp_adapter_put(struct zfcp_adapter *adapter)
1178 {
1179 if (atomic_dec_return(&adapter->refcount) == 0)
1180 wake_up(&adapter->remove_wq);
1181 }
1182
1183 static inline void
1184 zfcp_adapter_wait(struct zfcp_adapter *adapter)
1185 {
1186 wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
1187 }
1188
1189 #endif /* ZFCP_DEF_H */
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