tty/serial: atmel_serial: whitespace and braces modifications
[zen-stable.git] / drivers / scsi / ibmvscsi / ibmvscsi.c
blob3d391dc3f11fe7ce8272a85d92968a10cc329b26
1 /* ------------------------------------------------------------
2 * ibmvscsi.c
3 * (C) Copyright IBM Corporation 1994, 2004
4 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
5 * Santiago Leon (santil@us.ibm.com)
6 * Dave Boutcher (sleddog@us.ibm.com)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
23 * ------------------------------------------------------------
24 * Emulation of a SCSI host adapter for Virtual I/O devices
26 * This driver supports the SCSI adapter implemented by the IBM
27 * Power5 firmware. That SCSI adapter is not a physical adapter,
28 * but allows Linux SCSI peripheral drivers to directly
29 * access devices in another logical partition on the physical system.
31 * The virtual adapter(s) are present in the open firmware device
32 * tree just like real adapters.
34 * One of the capabilities provided on these systems is the ability
35 * to DMA between partitions. The architecture states that for VSCSI,
36 * the server side is allowed to DMA to and from the client. The client
37 * is never trusted to DMA to or from the server directly.
39 * Messages are sent between partitions on a "Command/Response Queue"
40 * (CRQ), which is just a buffer of 16 byte entries in the receiver's
41 * Senders cannot access the buffer directly, but send messages by
42 * making a hypervisor call and passing in the 16 bytes. The hypervisor
43 * puts the message in the next 16 byte space in round-robin fashion,
44 * turns on the high order bit of the message (the valid bit), and
45 * generates an interrupt to the receiver (if interrupts are turned on.)
46 * The receiver just turns off the valid bit when they have copied out
47 * the message.
49 * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
50 * (IU) (as defined in the T10 standard available at www.t10.org), gets
51 * a DMA address for the message, and sends it to the server as the
52 * payload of a CRQ message. The server DMAs the SRP IU and processes it,
53 * including doing any additional data transfers. When it is done, it
54 * DMAs the SRP response back to the same address as the request came from,
55 * and sends a CRQ message back to inform the client that the request has
56 * completed.
58 * Note that some of the underlying infrastructure is different between
59 * machines conforming to the "RS/6000 Platform Architecture" (RPA) and
60 * the older iSeries hypervisor models. To support both, some low level
61 * routines have been broken out into rpa_vscsi.c and iseries_vscsi.c.
62 * The Makefile should pick one, not two, not zero, of these.
64 * TODO: This is currently pretty tied to the IBM i/pSeries hypervisor
65 * interfaces. It would be really nice to abstract this above an RDMA
66 * layer.
69 #include <linux/module.h>
70 #include <linux/moduleparam.h>
71 #include <linux/dma-mapping.h>
72 #include <linux/delay.h>
73 #include <linux/slab.h>
74 #include <linux/of.h>
75 #include <linux/pm.h>
76 #include <linux/kthread.h>
77 #include <asm/firmware.h>
78 #include <asm/vio.h>
79 #include <scsi/scsi.h>
80 #include <scsi/scsi_cmnd.h>
81 #include <scsi/scsi_host.h>
82 #include <scsi/scsi_device.h>
83 #include <scsi/scsi_transport_srp.h>
84 #include "ibmvscsi.h"
86 /* The values below are somewhat arbitrary default values, but
87 * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
88 * Note that there are 3 bits of channel value, 6 bits of id, and
89 * 5 bits of LUN.
91 static int max_id = 64;
92 static int max_channel = 3;
93 static int init_timeout = 300;
94 static int login_timeout = 60;
95 static int info_timeout = 30;
96 static int abort_timeout = 60;
97 static int reset_timeout = 60;
98 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
99 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
100 static int fast_fail = 1;
101 static int client_reserve = 1;
103 static struct scsi_transport_template *ibmvscsi_transport_template;
105 #define IBMVSCSI_VERSION "1.5.9"
107 static struct ibmvscsi_ops *ibmvscsi_ops;
109 MODULE_DESCRIPTION("IBM Virtual SCSI");
110 MODULE_AUTHOR("Dave Boutcher");
111 MODULE_LICENSE("GPL");
112 MODULE_VERSION(IBMVSCSI_VERSION);
114 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
115 MODULE_PARM_DESC(max_id, "Largest ID value for each channel");
116 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(max_channel, "Largest channel value");
118 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
119 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
120 module_param_named(max_requests, max_requests, int, S_IRUGO);
121 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
122 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
123 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
124 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
125 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
127 /* ------------------------------------------------------------
128 * Routines for the event pool and event structs
131 * initialize_event_pool: - Allocates and initializes the event pool for a host
132 * @pool: event_pool to be initialized
133 * @size: Number of events in pool
134 * @hostdata: ibmvscsi_host_data who owns the event pool
136 * Returns zero on success.
138 static int initialize_event_pool(struct event_pool *pool,
139 int size, struct ibmvscsi_host_data *hostdata)
141 int i;
143 pool->size = size;
144 pool->next = 0;
145 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
146 if (!pool->events)
147 return -ENOMEM;
149 pool->iu_storage =
150 dma_alloc_coherent(hostdata->dev,
151 pool->size * sizeof(*pool->iu_storage),
152 &pool->iu_token, 0);
153 if (!pool->iu_storage) {
154 kfree(pool->events);
155 return -ENOMEM;
158 for (i = 0; i < pool->size; ++i) {
159 struct srp_event_struct *evt = &pool->events[i];
160 memset(&evt->crq, 0x00, sizeof(evt->crq));
161 atomic_set(&evt->free, 1);
162 evt->crq.valid = 0x80;
163 evt->crq.IU_length = sizeof(*evt->xfer_iu);
164 evt->crq.IU_data_ptr = pool->iu_token +
165 sizeof(*evt->xfer_iu) * i;
166 evt->xfer_iu = pool->iu_storage + i;
167 evt->hostdata = hostdata;
168 evt->ext_list = NULL;
169 evt->ext_list_token = 0;
172 return 0;
176 * release_event_pool: - Frees memory of an event pool of a host
177 * @pool: event_pool to be released
178 * @hostdata: ibmvscsi_host_data who owns the even pool
180 * Returns zero on success.
182 static void release_event_pool(struct event_pool *pool,
183 struct ibmvscsi_host_data *hostdata)
185 int i, in_use = 0;
186 for (i = 0; i < pool->size; ++i) {
187 if (atomic_read(&pool->events[i].free) != 1)
188 ++in_use;
189 if (pool->events[i].ext_list) {
190 dma_free_coherent(hostdata->dev,
191 SG_ALL * sizeof(struct srp_direct_buf),
192 pool->events[i].ext_list,
193 pool->events[i].ext_list_token);
196 if (in_use)
197 dev_warn(hostdata->dev, "releasing event pool with %d "
198 "events still in use?\n", in_use);
199 kfree(pool->events);
200 dma_free_coherent(hostdata->dev,
201 pool->size * sizeof(*pool->iu_storage),
202 pool->iu_storage, pool->iu_token);
206 * valid_event_struct: - Determines if event is valid.
207 * @pool: event_pool that contains the event
208 * @evt: srp_event_struct to be checked for validity
210 * Returns zero if event is invalid, one otherwise.
212 static int valid_event_struct(struct event_pool *pool,
213 struct srp_event_struct *evt)
215 int index = evt - pool->events;
216 if (index < 0 || index >= pool->size) /* outside of bounds */
217 return 0;
218 if (evt != pool->events + index) /* unaligned */
219 return 0;
220 return 1;
224 * ibmvscsi_free-event_struct: - Changes status of event to "free"
225 * @pool: event_pool that contains the event
226 * @evt: srp_event_struct to be modified
229 static void free_event_struct(struct event_pool *pool,
230 struct srp_event_struct *evt)
232 if (!valid_event_struct(pool, evt)) {
233 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
234 "(not in pool %p)\n", evt, pool->events);
235 return;
237 if (atomic_inc_return(&evt->free) != 1) {
238 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
239 "which is not in use!\n", evt);
240 return;
245 * get_evt_struct: - Gets the next free event in pool
246 * @pool: event_pool that contains the events to be searched
248 * Returns the next event in "free" state, and NULL if none are free.
249 * Note that no synchronization is done here, we assume the host_lock
250 * will syncrhonze things.
252 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
254 int i;
255 int poolsize = pool->size;
256 int offset = pool->next;
258 for (i = 0; i < poolsize; i++) {
259 offset = (offset + 1) % poolsize;
260 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
261 pool->next = offset;
262 return &pool->events[offset];
266 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
267 return NULL;
271 * init_event_struct: Initialize fields in an event struct that are always
272 * required.
273 * @evt: The event
274 * @done: Routine to call when the event is responded to
275 * @format: SRP or MAD format
276 * @timeout: timeout value set in the CRQ
278 static void init_event_struct(struct srp_event_struct *evt_struct,
279 void (*done) (struct srp_event_struct *),
280 u8 format,
281 int timeout)
283 evt_struct->cmnd = NULL;
284 evt_struct->cmnd_done = NULL;
285 evt_struct->sync_srp = NULL;
286 evt_struct->crq.format = format;
287 evt_struct->crq.timeout = timeout;
288 evt_struct->done = done;
291 /* ------------------------------------------------------------
292 * Routines for receiving SCSI responses from the hosting partition
296 * set_srp_direction: Set the fields in the srp related to data
297 * direction and number of buffers based on the direction in
298 * the scsi_cmnd and the number of buffers
300 static void set_srp_direction(struct scsi_cmnd *cmd,
301 struct srp_cmd *srp_cmd,
302 int numbuf)
304 u8 fmt;
306 if (numbuf == 0)
307 return;
309 if (numbuf == 1)
310 fmt = SRP_DATA_DESC_DIRECT;
311 else {
312 fmt = SRP_DATA_DESC_INDIRECT;
313 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
315 if (cmd->sc_data_direction == DMA_TO_DEVICE)
316 srp_cmd->data_out_desc_cnt = numbuf;
317 else
318 srp_cmd->data_in_desc_cnt = numbuf;
321 if (cmd->sc_data_direction == DMA_TO_DEVICE)
322 srp_cmd->buf_fmt = fmt << 4;
323 else
324 srp_cmd->buf_fmt = fmt;
328 * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
329 * @cmd: srp_cmd whose additional_data member will be unmapped
330 * @dev: device for which the memory is mapped
333 static void unmap_cmd_data(struct srp_cmd *cmd,
334 struct srp_event_struct *evt_struct,
335 struct device *dev)
337 u8 out_fmt, in_fmt;
339 out_fmt = cmd->buf_fmt >> 4;
340 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
342 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
343 return;
345 if (evt_struct->cmnd)
346 scsi_dma_unmap(evt_struct->cmnd);
349 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
350 struct srp_direct_buf *md)
352 int i;
353 struct scatterlist *sg;
354 u64 total_length = 0;
356 scsi_for_each_sg(cmd, sg, nseg, i) {
357 struct srp_direct_buf *descr = md + i;
358 descr->va = sg_dma_address(sg);
359 descr->len = sg_dma_len(sg);
360 descr->key = 0;
361 total_length += sg_dma_len(sg);
363 return total_length;
367 * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
368 * @cmd: Scsi_Cmnd with the scatterlist
369 * @srp_cmd: srp_cmd that contains the memory descriptor
370 * @dev: device for which to map dma memory
372 * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
373 * Returns 1 on success.
375 static int map_sg_data(struct scsi_cmnd *cmd,
376 struct srp_event_struct *evt_struct,
377 struct srp_cmd *srp_cmd, struct device *dev)
380 int sg_mapped;
381 u64 total_length = 0;
382 struct srp_direct_buf *data =
383 (struct srp_direct_buf *) srp_cmd->add_data;
384 struct srp_indirect_buf *indirect =
385 (struct srp_indirect_buf *) data;
387 sg_mapped = scsi_dma_map(cmd);
388 if (!sg_mapped)
389 return 1;
390 else if (sg_mapped < 0)
391 return 0;
393 set_srp_direction(cmd, srp_cmd, sg_mapped);
395 /* special case; we can use a single direct descriptor */
396 if (sg_mapped == 1) {
397 map_sg_list(cmd, sg_mapped, data);
398 return 1;
401 indirect->table_desc.va = 0;
402 indirect->table_desc.len = sg_mapped * sizeof(struct srp_direct_buf);
403 indirect->table_desc.key = 0;
405 if (sg_mapped <= MAX_INDIRECT_BUFS) {
406 total_length = map_sg_list(cmd, sg_mapped,
407 &indirect->desc_list[0]);
408 indirect->len = total_length;
409 return 1;
412 /* get indirect table */
413 if (!evt_struct->ext_list) {
414 evt_struct->ext_list = (struct srp_direct_buf *)
415 dma_alloc_coherent(dev,
416 SG_ALL * sizeof(struct srp_direct_buf),
417 &evt_struct->ext_list_token, 0);
418 if (!evt_struct->ext_list) {
419 if (!firmware_has_feature(FW_FEATURE_CMO))
420 sdev_printk(KERN_ERR, cmd->device,
421 "Can't allocate memory "
422 "for indirect table\n");
423 scsi_dma_unmap(cmd);
424 return 0;
428 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
430 indirect->len = total_length;
431 indirect->table_desc.va = evt_struct->ext_list_token;
432 indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
433 memcpy(indirect->desc_list, evt_struct->ext_list,
434 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
435 return 1;
439 * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
440 * @cmd: struct scsi_cmnd with the memory to be mapped
441 * @srp_cmd: srp_cmd that contains the memory descriptor
442 * @dev: dma device for which to map dma memory
444 * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds
445 * Returns 1 on success.
447 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
448 struct srp_event_struct *evt_struct,
449 struct srp_cmd *srp_cmd, struct device *dev)
451 switch (cmd->sc_data_direction) {
452 case DMA_FROM_DEVICE:
453 case DMA_TO_DEVICE:
454 break;
455 case DMA_NONE:
456 return 1;
457 case DMA_BIDIRECTIONAL:
458 sdev_printk(KERN_ERR, cmd->device,
459 "Can't map DMA_BIDIRECTIONAL to read/write\n");
460 return 0;
461 default:
462 sdev_printk(KERN_ERR, cmd->device,
463 "Unknown data direction 0x%02x; can't map!\n",
464 cmd->sc_data_direction);
465 return 0;
468 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
472 * purge_requests: Our virtual adapter just shut down. purge any sent requests
473 * @hostdata: the adapter
475 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
477 struct srp_event_struct *evt;
478 unsigned long flags;
480 spin_lock_irqsave(hostdata->host->host_lock, flags);
481 while (!list_empty(&hostdata->sent)) {
482 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
483 list_del(&evt->list);
484 del_timer(&evt->timer);
486 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
487 if (evt->cmnd) {
488 evt->cmnd->result = (error_code << 16);
489 unmap_cmd_data(&evt->iu.srp.cmd, evt,
490 evt->hostdata->dev);
491 if (evt->cmnd_done)
492 evt->cmnd_done(evt->cmnd);
493 } else if (evt->done)
494 evt->done(evt);
495 free_event_struct(&evt->hostdata->pool, evt);
496 spin_lock_irqsave(hostdata->host->host_lock, flags);
498 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
502 * ibmvscsi_reset_host - Reset the connection to the server
503 * @hostdata: struct ibmvscsi_host_data to reset
505 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
507 scsi_block_requests(hostdata->host);
508 atomic_set(&hostdata->request_limit, 0);
510 purge_requests(hostdata, DID_ERROR);
511 hostdata->reset_crq = 1;
512 wake_up(&hostdata->work_wait_q);
516 * ibmvscsi_timeout - Internal command timeout handler
517 * @evt_struct: struct srp_event_struct that timed out
519 * Called when an internally generated command times out
521 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
523 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
525 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
526 evt_struct->iu.srp.cmd.opcode);
528 ibmvscsi_reset_host(hostdata);
532 /* ------------------------------------------------------------
533 * Routines for sending and receiving SRPs
536 * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
537 * @evt_struct: evt_struct to be sent
538 * @hostdata: ibmvscsi_host_data of host
539 * @timeout: timeout in seconds - 0 means do not time command
541 * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
542 * Note that this routine assumes that host_lock is held for synchronization
544 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
545 struct ibmvscsi_host_data *hostdata,
546 unsigned long timeout)
548 u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
549 int request_status = 0;
550 int rc;
551 int srp_req = 0;
553 /* If we have exhausted our request limit, just fail this request,
554 * unless it is for a reset or abort.
555 * Note that there are rare cases involving driver generated requests
556 * (such as task management requests) that the mid layer may think we
557 * can handle more requests (can_queue) when we actually can't
559 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
560 srp_req = 1;
561 request_status =
562 atomic_dec_if_positive(&hostdata->request_limit);
563 /* If request limit was -1 when we started, it is now even
564 * less than that
566 if (request_status < -1)
567 goto send_error;
568 /* Otherwise, we may have run out of requests. */
569 /* If request limit was 0 when we started the adapter is in the
570 * process of performing a login with the server adapter, or
571 * we may have run out of requests.
573 else if (request_status == -1 &&
574 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
575 goto send_busy;
576 /* Abort and reset calls should make it through.
577 * Nothing except abort and reset should use the last two
578 * slots unless we had two or less to begin with.
580 else if (request_status < 2 &&
581 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
582 /* In the case that we have less than two requests
583 * available, check the server limit as a combination
584 * of the request limit and the number of requests
585 * in-flight (the size of the send list). If the
586 * server limit is greater than 2, return busy so
587 * that the last two are reserved for reset and abort.
589 int server_limit = request_status;
590 struct srp_event_struct *tmp_evt;
592 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
593 server_limit++;
596 if (server_limit > 2)
597 goto send_busy;
601 /* Copy the IU into the transfer area */
602 *evt_struct->xfer_iu = evt_struct->iu;
603 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
605 /* Add this to the sent list. We need to do this
606 * before we actually send
607 * in case it comes back REALLY fast
609 list_add_tail(&evt_struct->list, &hostdata->sent);
611 init_timer(&evt_struct->timer);
612 if (timeout) {
613 evt_struct->timer.data = (unsigned long) evt_struct;
614 evt_struct->timer.expires = jiffies + (timeout * HZ);
615 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
616 add_timer(&evt_struct->timer);
619 if ((rc =
620 ibmvscsi_ops->send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
621 list_del(&evt_struct->list);
622 del_timer(&evt_struct->timer);
624 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
625 * Firmware will send a CRQ with a transport event (0xFF) to
626 * tell this client what has happened to the transport. This
627 * will be handled in ibmvscsi_handle_crq()
629 if (rc == H_CLOSED) {
630 dev_warn(hostdata->dev, "send warning. "
631 "Receive queue closed, will retry.\n");
632 goto send_busy;
634 dev_err(hostdata->dev, "send error %d\n", rc);
635 if (srp_req)
636 atomic_inc(&hostdata->request_limit);
637 goto send_error;
640 return 0;
642 send_busy:
643 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
645 free_event_struct(&hostdata->pool, evt_struct);
646 if (srp_req && request_status != -1)
647 atomic_inc(&hostdata->request_limit);
648 return SCSI_MLQUEUE_HOST_BUSY;
650 send_error:
651 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
653 if (evt_struct->cmnd != NULL) {
654 evt_struct->cmnd->result = DID_ERROR << 16;
655 evt_struct->cmnd_done(evt_struct->cmnd);
656 } else if (evt_struct->done)
657 evt_struct->done(evt_struct);
659 free_event_struct(&hostdata->pool, evt_struct);
660 return 0;
664 * handle_cmd_rsp: - Handle responses from commands
665 * @evt_struct: srp_event_struct to be handled
667 * Used as a callback by when sending scsi cmds.
668 * Gets called by ibmvscsi_handle_crq()
670 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
672 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
673 struct scsi_cmnd *cmnd = evt_struct->cmnd;
675 if (unlikely(rsp->opcode != SRP_RSP)) {
676 if (printk_ratelimit())
677 dev_warn(evt_struct->hostdata->dev,
678 "bad SRP RSP type %d\n", rsp->opcode);
681 if (cmnd) {
682 cmnd->result |= rsp->status;
683 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
684 memcpy(cmnd->sense_buffer,
685 rsp->data,
686 rsp->sense_data_len);
687 unmap_cmd_data(&evt_struct->iu.srp.cmd,
688 evt_struct,
689 evt_struct->hostdata->dev);
691 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
692 scsi_set_resid(cmnd, rsp->data_out_res_cnt);
693 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
694 scsi_set_resid(cmnd, rsp->data_in_res_cnt);
697 if (evt_struct->cmnd_done)
698 evt_struct->cmnd_done(cmnd);
702 * lun_from_dev: - Returns the lun of the scsi device
703 * @dev: struct scsi_device
706 static inline u16 lun_from_dev(struct scsi_device *dev)
708 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
712 * ibmvscsi_queue: - The queuecommand function of the scsi template
713 * @cmd: struct scsi_cmnd to be executed
714 * @done: Callback function to be called when cmd is completed
716 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
717 void (*done) (struct scsi_cmnd *))
719 struct srp_cmd *srp_cmd;
720 struct srp_event_struct *evt_struct;
721 struct srp_indirect_buf *indirect;
722 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
723 u16 lun = lun_from_dev(cmnd->device);
724 u8 out_fmt, in_fmt;
726 cmnd->result = (DID_OK << 16);
727 evt_struct = get_event_struct(&hostdata->pool);
728 if (!evt_struct)
729 return SCSI_MLQUEUE_HOST_BUSY;
731 /* Set up the actual SRP IU */
732 srp_cmd = &evt_struct->iu.srp.cmd;
733 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
734 srp_cmd->opcode = SRP_CMD;
735 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
736 srp_cmd->lun = ((u64) lun) << 48;
738 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
739 if (!firmware_has_feature(FW_FEATURE_CMO))
740 sdev_printk(KERN_ERR, cmnd->device,
741 "couldn't convert cmd to srp_cmd\n");
742 free_event_struct(&hostdata->pool, evt_struct);
743 return SCSI_MLQUEUE_HOST_BUSY;
746 init_event_struct(evt_struct,
747 handle_cmd_rsp,
748 VIOSRP_SRP_FORMAT,
749 cmnd->request->timeout/HZ);
751 evt_struct->cmnd = cmnd;
752 evt_struct->cmnd_done = done;
754 /* Fix up dma address of the buffer itself */
755 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
756 out_fmt = srp_cmd->buf_fmt >> 4;
757 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
758 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
759 out_fmt == SRP_DATA_DESC_INDIRECT) &&
760 indirect->table_desc.va == 0) {
761 indirect->table_desc.va = evt_struct->crq.IU_data_ptr +
762 offsetof(struct srp_cmd, add_data) +
763 offsetof(struct srp_indirect_buf, desc_list);
766 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
769 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
771 /* ------------------------------------------------------------
772 * Routines for driver initialization
776 * map_persist_bufs: - Pre-map persistent data for adapter logins
777 * @hostdata: ibmvscsi_host_data of host
779 * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
780 * Return 1 on error, 0 on success.
782 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
785 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
786 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
788 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
789 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
790 return 1;
793 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
794 &hostdata->madapter_info,
795 sizeof(hostdata->madapter_info),
796 DMA_BIDIRECTIONAL);
797 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
798 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
799 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
800 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
801 return 1;
804 return 0;
808 * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
809 * @hostdata: ibmvscsi_host_data of host
811 * Unmap the capabilities and adapter info DMA buffers
813 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
815 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
816 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
818 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
819 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
823 * login_rsp: - Handle response to SRP login request
824 * @evt_struct: srp_event_struct with the response
826 * Used as a "done" callback by when sending srp_login. Gets called
827 * by ibmvscsi_handle_crq()
829 static void login_rsp(struct srp_event_struct *evt_struct)
831 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
832 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
833 case SRP_LOGIN_RSP: /* it worked! */
834 break;
835 case SRP_LOGIN_REJ: /* refused! */
836 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
837 evt_struct->xfer_iu->srp.login_rej.reason);
838 /* Login failed. */
839 atomic_set(&hostdata->request_limit, -1);
840 return;
841 default:
842 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
843 evt_struct->xfer_iu->srp.login_rsp.opcode);
844 /* Login failed. */
845 atomic_set(&hostdata->request_limit, -1);
846 return;
849 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
850 hostdata->client_migrated = 0;
852 /* Now we know what the real request-limit is.
853 * This value is set rather than added to request_limit because
854 * request_limit could have been set to -1 by this client.
856 atomic_set(&hostdata->request_limit,
857 evt_struct->xfer_iu->srp.login_rsp.req_lim_delta);
859 /* If we had any pending I/Os, kick them */
860 scsi_unblock_requests(hostdata->host);
864 * send_srp_login: - Sends the srp login
865 * @hostdata: ibmvscsi_host_data of host
867 * Returns zero if successful.
869 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
871 int rc;
872 unsigned long flags;
873 struct srp_login_req *login;
874 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
876 BUG_ON(!evt_struct);
877 init_event_struct(evt_struct, login_rsp,
878 VIOSRP_SRP_FORMAT, login_timeout);
880 login = &evt_struct->iu.srp.login_req;
881 memset(login, 0, sizeof(*login));
882 login->opcode = SRP_LOGIN_REQ;
883 login->req_it_iu_len = sizeof(union srp_iu);
884 login->req_buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
886 spin_lock_irqsave(hostdata->host->host_lock, flags);
887 /* Start out with a request limit of 0, since this is negotiated in
888 * the login request we are just sending and login requests always
889 * get sent by the driver regardless of request_limit.
891 atomic_set(&hostdata->request_limit, 0);
893 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
894 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
895 dev_info(hostdata->dev, "sent SRP login\n");
896 return rc;
900 * capabilities_rsp: - Handle response to MAD adapter capabilities request
901 * @evt_struct: srp_event_struct with the response
903 * Used as a "done" callback by when sending adapter_info.
905 static void capabilities_rsp(struct srp_event_struct *evt_struct)
907 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
909 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
910 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
911 evt_struct->xfer_iu->mad.capabilities.common.status);
912 } else {
913 if (hostdata->caps.migration.common.server_support != SERVER_SUPPORTS_CAP)
914 dev_info(hostdata->dev, "Partition migration not supported\n");
916 if (client_reserve) {
917 if (hostdata->caps.reserve.common.server_support ==
918 SERVER_SUPPORTS_CAP)
919 dev_info(hostdata->dev, "Client reserve enabled\n");
920 else
921 dev_info(hostdata->dev, "Client reserve not supported\n");
925 send_srp_login(hostdata);
929 * send_mad_capabilities: - Sends the mad capabilities request
930 * and stores the result so it can be retrieved with
931 * @hostdata: ibmvscsi_host_data of host
933 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
935 struct viosrp_capabilities *req;
936 struct srp_event_struct *evt_struct;
937 unsigned long flags;
938 struct device_node *of_node = hostdata->dev->of_node;
939 const char *location;
941 evt_struct = get_event_struct(&hostdata->pool);
942 BUG_ON(!evt_struct);
944 init_event_struct(evt_struct, capabilities_rsp,
945 VIOSRP_MAD_FORMAT, info_timeout);
947 req = &evt_struct->iu.mad.capabilities;
948 memset(req, 0, sizeof(*req));
950 hostdata->caps.flags = CAP_LIST_SUPPORTED;
951 if (hostdata->client_migrated)
952 hostdata->caps.flags |= CLIENT_MIGRATED;
954 strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
955 sizeof(hostdata->caps.name));
956 hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
958 location = of_get_property(of_node, "ibm,loc-code", NULL);
959 location = location ? location : dev_name(hostdata->dev);
960 strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
961 hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
963 req->common.type = VIOSRP_CAPABILITIES_TYPE;
964 req->buffer = hostdata->caps_addr;
966 hostdata->caps.migration.common.cap_type = MIGRATION_CAPABILITIES;
967 hostdata->caps.migration.common.length = sizeof(hostdata->caps.migration);
968 hostdata->caps.migration.common.server_support = SERVER_SUPPORTS_CAP;
969 hostdata->caps.migration.ecl = 1;
971 if (client_reserve) {
972 hostdata->caps.reserve.common.cap_type = RESERVATION_CAPABILITIES;
973 hostdata->caps.reserve.common.length = sizeof(hostdata->caps.reserve);
974 hostdata->caps.reserve.common.server_support = SERVER_SUPPORTS_CAP;
975 hostdata->caps.reserve.type = CLIENT_RESERVE_SCSI_2;
976 req->common.length = sizeof(hostdata->caps);
977 } else
978 req->common.length = sizeof(hostdata->caps) - sizeof(hostdata->caps.reserve);
980 spin_lock_irqsave(hostdata->host->host_lock, flags);
981 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
982 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
983 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
987 * fast_fail_rsp: - Handle response to MAD enable fast fail
988 * @evt_struct: srp_event_struct with the response
990 * Used as a "done" callback by when sending enable fast fail. Gets called
991 * by ibmvscsi_handle_crq()
993 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
995 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
996 u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
998 if (status == VIOSRP_MAD_NOT_SUPPORTED)
999 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1000 else if (status == VIOSRP_MAD_FAILED)
1001 dev_err(hostdata->dev, "fast_fail request failed\n");
1002 else if (status != VIOSRP_MAD_SUCCESS)
1003 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1005 send_mad_capabilities(hostdata);
1009 * init_host - Start host initialization
1010 * @hostdata: ibmvscsi_host_data of host
1012 * Returns zero if successful.
1014 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1016 int rc;
1017 unsigned long flags;
1018 struct viosrp_fast_fail *fast_fail_mad;
1019 struct srp_event_struct *evt_struct;
1021 if (!fast_fail) {
1022 send_mad_capabilities(hostdata);
1023 return 0;
1026 evt_struct = get_event_struct(&hostdata->pool);
1027 BUG_ON(!evt_struct);
1029 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1031 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1032 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1033 fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
1034 fast_fail_mad->common.length = sizeof(*fast_fail_mad);
1036 spin_lock_irqsave(hostdata->host->host_lock, flags);
1037 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1038 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1039 return rc;
1043 * adapter_info_rsp: - Handle response to MAD adapter info request
1044 * @evt_struct: srp_event_struct with the response
1046 * Used as a "done" callback by when sending adapter_info. Gets called
1047 * by ibmvscsi_handle_crq()
1049 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1051 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1053 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1054 dev_err(hostdata->dev, "error %d getting adapter info\n",
1055 evt_struct->xfer_iu->mad.adapter_info.common.status);
1056 } else {
1057 dev_info(hostdata->dev, "host srp version: %s, "
1058 "host partition %s (%d), OS %d, max io %u\n",
1059 hostdata->madapter_info.srp_version,
1060 hostdata->madapter_info.partition_name,
1061 hostdata->madapter_info.partition_number,
1062 hostdata->madapter_info.os_type,
1063 hostdata->madapter_info.port_max_txu[0]);
1065 if (hostdata->madapter_info.port_max_txu[0])
1066 hostdata->host->max_sectors =
1067 hostdata->madapter_info.port_max_txu[0] >> 9;
1069 if (hostdata->madapter_info.os_type == 3 &&
1070 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1071 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1072 hostdata->madapter_info.srp_version);
1073 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1074 MAX_INDIRECT_BUFS);
1075 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1078 if (hostdata->madapter_info.os_type == 3) {
1079 enable_fast_fail(hostdata);
1080 return;
1084 send_srp_login(hostdata);
1088 * send_mad_adapter_info: - Sends the mad adapter info request
1089 * and stores the result so it can be retrieved with
1090 * sysfs. We COULD consider causing a failure if the
1091 * returned SRP version doesn't match ours.
1092 * @hostdata: ibmvscsi_host_data of host
1094 * Returns zero if successful.
1096 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1098 struct viosrp_adapter_info *req;
1099 struct srp_event_struct *evt_struct;
1100 unsigned long flags;
1102 evt_struct = get_event_struct(&hostdata->pool);
1103 BUG_ON(!evt_struct);
1105 init_event_struct(evt_struct,
1106 adapter_info_rsp,
1107 VIOSRP_MAD_FORMAT,
1108 info_timeout);
1110 req = &evt_struct->iu.mad.adapter_info;
1111 memset(req, 0x00, sizeof(*req));
1113 req->common.type = VIOSRP_ADAPTER_INFO_TYPE;
1114 req->common.length = sizeof(hostdata->madapter_info);
1115 req->buffer = hostdata->adapter_info_addr;
1117 spin_lock_irqsave(hostdata->host->host_lock, flags);
1118 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1119 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1120 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1124 * init_adapter: Start virtual adapter initialization sequence
1127 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1129 send_mad_adapter_info(hostdata);
1133 * sync_completion: Signal that a synchronous command has completed
1134 * Note that after returning from this call, the evt_struct is freed.
1135 * the caller waiting on this completion shouldn't touch the evt_struct
1136 * again.
1138 static void sync_completion(struct srp_event_struct *evt_struct)
1140 /* copy the response back */
1141 if (evt_struct->sync_srp)
1142 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1144 complete(&evt_struct->comp);
1148 * ibmvscsi_abort: Abort a command...from scsi host template
1149 * send this over to the server and wait synchronously for the response
1151 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1153 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1154 struct srp_tsk_mgmt *tsk_mgmt;
1155 struct srp_event_struct *evt;
1156 struct srp_event_struct *tmp_evt, *found_evt;
1157 union viosrp_iu srp_rsp;
1158 int rsp_rc;
1159 unsigned long flags;
1160 u16 lun = lun_from_dev(cmd->device);
1161 unsigned long wait_switch = 0;
1163 /* First, find this command in our sent list so we can figure
1164 * out the correct tag
1166 spin_lock_irqsave(hostdata->host->host_lock, flags);
1167 wait_switch = jiffies + (init_timeout * HZ);
1168 do {
1169 found_evt = NULL;
1170 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1171 if (tmp_evt->cmnd == cmd) {
1172 found_evt = tmp_evt;
1173 break;
1177 if (!found_evt) {
1178 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1179 return SUCCESS;
1182 evt = get_event_struct(&hostdata->pool);
1183 if (evt == NULL) {
1184 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1185 sdev_printk(KERN_ERR, cmd->device,
1186 "failed to allocate abort event\n");
1187 return FAILED;
1190 init_event_struct(evt,
1191 sync_completion,
1192 VIOSRP_SRP_FORMAT,
1193 abort_timeout);
1195 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1197 /* Set up an abort SRP command */
1198 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1199 tsk_mgmt->opcode = SRP_TSK_MGMT;
1200 tsk_mgmt->lun = ((u64) lun) << 48;
1201 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1202 tsk_mgmt->task_tag = (u64) found_evt;
1204 evt->sync_srp = &srp_rsp;
1206 init_completion(&evt->comp);
1207 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1209 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1210 break;
1212 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1213 msleep(10);
1214 spin_lock_irqsave(hostdata->host->host_lock, flags);
1215 } while (time_before(jiffies, wait_switch));
1217 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1219 if (rsp_rc != 0) {
1220 sdev_printk(KERN_ERR, cmd->device,
1221 "failed to send abort() event. rc=%d\n", rsp_rc);
1222 return FAILED;
1225 sdev_printk(KERN_INFO, cmd->device,
1226 "aborting command. lun 0x%llx, tag 0x%llx\n",
1227 (((u64) lun) << 48), (u64) found_evt);
1229 wait_for_completion(&evt->comp);
1231 /* make sure we got a good response */
1232 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1233 if (printk_ratelimit())
1234 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1235 srp_rsp.srp.rsp.opcode);
1236 return FAILED;
1239 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1240 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1241 else
1242 rsp_rc = srp_rsp.srp.rsp.status;
1244 if (rsp_rc) {
1245 if (printk_ratelimit())
1246 sdev_printk(KERN_WARNING, cmd->device,
1247 "abort code %d for task tag 0x%llx\n",
1248 rsp_rc, tsk_mgmt->task_tag);
1249 return FAILED;
1252 /* Because we dropped the spinlock above, it's possible
1253 * The event is no longer in our list. Make sure it didn't
1254 * complete while we were aborting
1256 spin_lock_irqsave(hostdata->host->host_lock, flags);
1257 found_evt = NULL;
1258 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1259 if (tmp_evt->cmnd == cmd) {
1260 found_evt = tmp_evt;
1261 break;
1265 if (found_evt == NULL) {
1266 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1267 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1268 tsk_mgmt->task_tag);
1269 return SUCCESS;
1272 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1273 tsk_mgmt->task_tag);
1275 cmd->result = (DID_ABORT << 16);
1276 list_del(&found_evt->list);
1277 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1278 found_evt->hostdata->dev);
1279 free_event_struct(&found_evt->hostdata->pool, found_evt);
1280 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1281 atomic_inc(&hostdata->request_limit);
1282 return SUCCESS;
1286 * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host
1287 * template send this over to the server and wait synchronously for the
1288 * response
1290 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1292 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1293 struct srp_tsk_mgmt *tsk_mgmt;
1294 struct srp_event_struct *evt;
1295 struct srp_event_struct *tmp_evt, *pos;
1296 union viosrp_iu srp_rsp;
1297 int rsp_rc;
1298 unsigned long flags;
1299 u16 lun = lun_from_dev(cmd->device);
1300 unsigned long wait_switch = 0;
1302 spin_lock_irqsave(hostdata->host->host_lock, flags);
1303 wait_switch = jiffies + (init_timeout * HZ);
1304 do {
1305 evt = get_event_struct(&hostdata->pool);
1306 if (evt == NULL) {
1307 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1308 sdev_printk(KERN_ERR, cmd->device,
1309 "failed to allocate reset event\n");
1310 return FAILED;
1313 init_event_struct(evt,
1314 sync_completion,
1315 VIOSRP_SRP_FORMAT,
1316 reset_timeout);
1318 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1320 /* Set up a lun reset SRP command */
1321 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1322 tsk_mgmt->opcode = SRP_TSK_MGMT;
1323 tsk_mgmt->lun = ((u64) lun) << 48;
1324 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1326 evt->sync_srp = &srp_rsp;
1328 init_completion(&evt->comp);
1329 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1331 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1332 break;
1334 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1335 msleep(10);
1336 spin_lock_irqsave(hostdata->host->host_lock, flags);
1337 } while (time_before(jiffies, wait_switch));
1339 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1341 if (rsp_rc != 0) {
1342 sdev_printk(KERN_ERR, cmd->device,
1343 "failed to send reset event. rc=%d\n", rsp_rc);
1344 return FAILED;
1347 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1348 (((u64) lun) << 48));
1350 wait_for_completion(&evt->comp);
1352 /* make sure we got a good response */
1353 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1354 if (printk_ratelimit())
1355 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1356 srp_rsp.srp.rsp.opcode);
1357 return FAILED;
1360 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1361 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1362 else
1363 rsp_rc = srp_rsp.srp.rsp.status;
1365 if (rsp_rc) {
1366 if (printk_ratelimit())
1367 sdev_printk(KERN_WARNING, cmd->device,
1368 "reset code %d for task tag 0x%llx\n",
1369 rsp_rc, tsk_mgmt->task_tag);
1370 return FAILED;
1373 /* We need to find all commands for this LUN that have not yet been
1374 * responded to, and fail them with DID_RESET
1376 spin_lock_irqsave(hostdata->host->host_lock, flags);
1377 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1378 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1379 if (tmp_evt->cmnd)
1380 tmp_evt->cmnd->result = (DID_RESET << 16);
1381 list_del(&tmp_evt->list);
1382 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1383 tmp_evt->hostdata->dev);
1384 free_event_struct(&tmp_evt->hostdata->pool,
1385 tmp_evt);
1386 atomic_inc(&hostdata->request_limit);
1387 if (tmp_evt->cmnd_done)
1388 tmp_evt->cmnd_done(tmp_evt->cmnd);
1389 else if (tmp_evt->done)
1390 tmp_evt->done(tmp_evt);
1393 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1394 return SUCCESS;
1398 * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1399 * @cmd: struct scsi_cmnd having problems
1401 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1403 unsigned long wait_switch = 0;
1404 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1406 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1408 ibmvscsi_reset_host(hostdata);
1410 for (wait_switch = jiffies + (init_timeout * HZ);
1411 time_before(jiffies, wait_switch) &&
1412 atomic_read(&hostdata->request_limit) < 2;) {
1414 msleep(10);
1417 if (atomic_read(&hostdata->request_limit) <= 0)
1418 return FAILED;
1420 return SUCCESS;
1424 * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1425 * @crq: Command/Response queue
1426 * @hostdata: ibmvscsi_host_data of host
1429 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1430 struct ibmvscsi_host_data *hostdata)
1432 long rc;
1433 unsigned long flags;
1434 struct srp_event_struct *evt_struct =
1435 (struct srp_event_struct *)crq->IU_data_ptr;
1436 switch (crq->valid) {
1437 case 0xC0: /* initialization */
1438 switch (crq->format) {
1439 case 0x01: /* Initialization message */
1440 dev_info(hostdata->dev, "partner initialized\n");
1441 /* Send back a response */
1442 if ((rc = ibmvscsi_ops->send_crq(hostdata,
1443 0xC002000000000000LL, 0)) == 0) {
1444 /* Now login */
1445 init_adapter(hostdata);
1446 } else {
1447 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1450 break;
1451 case 0x02: /* Initialization response */
1452 dev_info(hostdata->dev, "partner initialization complete\n");
1454 /* Now login */
1455 init_adapter(hostdata);
1456 break;
1457 default:
1458 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1460 return;
1461 case 0xFF: /* Hypervisor telling us the connection is closed */
1462 scsi_block_requests(hostdata->host);
1463 atomic_set(&hostdata->request_limit, 0);
1464 if (crq->format == 0x06) {
1465 /* We need to re-setup the interpartition connection */
1466 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1467 hostdata->client_migrated = 1;
1468 hostdata->reenable_crq = 1;
1469 purge_requests(hostdata, DID_REQUEUE);
1470 wake_up(&hostdata->work_wait_q);
1471 } else {
1472 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1473 crq->format);
1474 ibmvscsi_reset_host(hostdata);
1476 return;
1477 case 0x80: /* real payload */
1478 break;
1479 default:
1480 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1481 crq->valid);
1482 return;
1485 /* The only kind of payload CRQs we should get are responses to
1486 * things we send. Make sure this response is to something we
1487 * actually sent
1489 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1490 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1491 (void *)crq->IU_data_ptr);
1492 return;
1495 if (atomic_read(&evt_struct->free)) {
1496 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1497 (void *)crq->IU_data_ptr);
1498 return;
1501 if (crq->format == VIOSRP_SRP_FORMAT)
1502 atomic_add(evt_struct->xfer_iu->srp.rsp.req_lim_delta,
1503 &hostdata->request_limit);
1505 del_timer(&evt_struct->timer);
1507 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1508 evt_struct->cmnd->result = DID_ERROR << 16;
1509 if (evt_struct->done)
1510 evt_struct->done(evt_struct);
1511 else
1512 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1515 * Lock the host_lock before messing with these structures, since we
1516 * are running in a task context
1518 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1519 list_del(&evt_struct->list);
1520 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1521 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1525 * ibmvscsi_get_host_config: Send the command to the server to get host
1526 * configuration data. The data is opaque to us.
1528 static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
1529 unsigned char *buffer, int length)
1531 struct viosrp_host_config *host_config;
1532 struct srp_event_struct *evt_struct;
1533 unsigned long flags;
1534 dma_addr_t addr;
1535 int rc;
1537 evt_struct = get_event_struct(&hostdata->pool);
1538 if (!evt_struct) {
1539 dev_err(hostdata->dev, "couldn't allocate event for HOST_CONFIG!\n");
1540 return -1;
1543 init_event_struct(evt_struct,
1544 sync_completion,
1545 VIOSRP_MAD_FORMAT,
1546 info_timeout);
1548 host_config = &evt_struct->iu.mad.host_config;
1550 /* Set up a lun reset SRP command */
1551 memset(host_config, 0x00, sizeof(*host_config));
1552 host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
1553 host_config->common.length = length;
1554 host_config->buffer = addr = dma_map_single(hostdata->dev, buffer,
1555 length,
1556 DMA_BIDIRECTIONAL);
1558 if (dma_mapping_error(hostdata->dev, host_config->buffer)) {
1559 if (!firmware_has_feature(FW_FEATURE_CMO))
1560 dev_err(hostdata->dev,
1561 "dma_mapping error getting host config\n");
1562 free_event_struct(&hostdata->pool, evt_struct);
1563 return -1;
1566 init_completion(&evt_struct->comp);
1567 spin_lock_irqsave(hostdata->host->host_lock, flags);
1568 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1569 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1570 if (rc == 0)
1571 wait_for_completion(&evt_struct->comp);
1572 dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);
1574 return rc;
1578 * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1579 * @sdev: struct scsi_device device to configure
1581 * Enable allow_restart for a device if it is a disk. Adjust the
1582 * queue_depth here also as is required by the documentation for
1583 * struct scsi_host_template.
1585 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1587 struct Scsi_Host *shost = sdev->host;
1588 unsigned long lock_flags = 0;
1590 spin_lock_irqsave(shost->host_lock, lock_flags);
1591 if (sdev->type == TYPE_DISK) {
1592 sdev->allow_restart = 1;
1593 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1595 scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun);
1596 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1597 return 0;
1601 * ibmvscsi_change_queue_depth - Change the device's queue depth
1602 * @sdev: scsi device struct
1603 * @qdepth: depth to set
1604 * @reason: calling context
1606 * Return value:
1607 * actual depth set
1609 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth,
1610 int reason)
1612 if (reason != SCSI_QDEPTH_DEFAULT)
1613 return -EOPNOTSUPP;
1615 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1616 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1618 scsi_adjust_queue_depth(sdev, 0, qdepth);
1619 return sdev->queue_depth;
1622 /* ------------------------------------------------------------
1623 * sysfs attributes
1625 static ssize_t show_host_vhost_loc(struct device *dev,
1626 struct device_attribute *attr, char *buf)
1628 struct Scsi_Host *shost = class_to_shost(dev);
1629 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1630 int len;
1632 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1633 hostdata->caps.loc);
1634 return len;
1637 static struct device_attribute ibmvscsi_host_vhost_loc = {
1638 .attr = {
1639 .name = "vhost_loc",
1640 .mode = S_IRUGO,
1642 .show = show_host_vhost_loc,
1645 static ssize_t show_host_vhost_name(struct device *dev,
1646 struct device_attribute *attr, char *buf)
1648 struct Scsi_Host *shost = class_to_shost(dev);
1649 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1650 int len;
1652 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1653 hostdata->caps.name);
1654 return len;
1657 static struct device_attribute ibmvscsi_host_vhost_name = {
1658 .attr = {
1659 .name = "vhost_name",
1660 .mode = S_IRUGO,
1662 .show = show_host_vhost_name,
1665 static ssize_t show_host_srp_version(struct device *dev,
1666 struct device_attribute *attr, char *buf)
1668 struct Scsi_Host *shost = class_to_shost(dev);
1669 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1670 int len;
1672 len = snprintf(buf, PAGE_SIZE, "%s\n",
1673 hostdata->madapter_info.srp_version);
1674 return len;
1677 static struct device_attribute ibmvscsi_host_srp_version = {
1678 .attr = {
1679 .name = "srp_version",
1680 .mode = S_IRUGO,
1682 .show = show_host_srp_version,
1685 static ssize_t show_host_partition_name(struct device *dev,
1686 struct device_attribute *attr,
1687 char *buf)
1689 struct Scsi_Host *shost = class_to_shost(dev);
1690 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1691 int len;
1693 len = snprintf(buf, PAGE_SIZE, "%s\n",
1694 hostdata->madapter_info.partition_name);
1695 return len;
1698 static struct device_attribute ibmvscsi_host_partition_name = {
1699 .attr = {
1700 .name = "partition_name",
1701 .mode = S_IRUGO,
1703 .show = show_host_partition_name,
1706 static ssize_t show_host_partition_number(struct device *dev,
1707 struct device_attribute *attr,
1708 char *buf)
1710 struct Scsi_Host *shost = class_to_shost(dev);
1711 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1712 int len;
1714 len = snprintf(buf, PAGE_SIZE, "%d\n",
1715 hostdata->madapter_info.partition_number);
1716 return len;
1719 static struct device_attribute ibmvscsi_host_partition_number = {
1720 .attr = {
1721 .name = "partition_number",
1722 .mode = S_IRUGO,
1724 .show = show_host_partition_number,
1727 static ssize_t show_host_mad_version(struct device *dev,
1728 struct device_attribute *attr, char *buf)
1730 struct Scsi_Host *shost = class_to_shost(dev);
1731 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1732 int len;
1734 len = snprintf(buf, PAGE_SIZE, "%d\n",
1735 hostdata->madapter_info.mad_version);
1736 return len;
1739 static struct device_attribute ibmvscsi_host_mad_version = {
1740 .attr = {
1741 .name = "mad_version",
1742 .mode = S_IRUGO,
1744 .show = show_host_mad_version,
1747 static ssize_t show_host_os_type(struct device *dev,
1748 struct device_attribute *attr, char *buf)
1750 struct Scsi_Host *shost = class_to_shost(dev);
1751 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1752 int len;
1754 len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
1755 return len;
1758 static struct device_attribute ibmvscsi_host_os_type = {
1759 .attr = {
1760 .name = "os_type",
1761 .mode = S_IRUGO,
1763 .show = show_host_os_type,
1766 static ssize_t show_host_config(struct device *dev,
1767 struct device_attribute *attr, char *buf)
1769 struct Scsi_Host *shost = class_to_shost(dev);
1770 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1772 /* returns null-terminated host config data */
1773 if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
1774 return strlen(buf);
1775 else
1776 return 0;
1779 static struct device_attribute ibmvscsi_host_config = {
1780 .attr = {
1781 .name = "config",
1782 .mode = S_IRUGO,
1784 .show = show_host_config,
1787 static struct device_attribute *ibmvscsi_attrs[] = {
1788 &ibmvscsi_host_vhost_loc,
1789 &ibmvscsi_host_vhost_name,
1790 &ibmvscsi_host_srp_version,
1791 &ibmvscsi_host_partition_name,
1792 &ibmvscsi_host_partition_number,
1793 &ibmvscsi_host_mad_version,
1794 &ibmvscsi_host_os_type,
1795 &ibmvscsi_host_config,
1796 NULL
1799 /* ------------------------------------------------------------
1800 * SCSI driver registration
1802 static struct scsi_host_template driver_template = {
1803 .module = THIS_MODULE,
1804 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
1805 .proc_name = "ibmvscsi",
1806 .queuecommand = ibmvscsi_queuecommand,
1807 .eh_abort_handler = ibmvscsi_eh_abort_handler,
1808 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
1809 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
1810 .slave_configure = ibmvscsi_slave_configure,
1811 .change_queue_depth = ibmvscsi_change_queue_depth,
1812 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
1813 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
1814 .this_id = -1,
1815 .sg_tablesize = SG_ALL,
1816 .use_clustering = ENABLE_CLUSTERING,
1817 .shost_attrs = ibmvscsi_attrs,
1821 * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
1823 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1825 * Return value:
1826 * Number of bytes of IO data the driver will need to perform well.
1828 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
1830 /* iu_storage data allocated in initialize_event_pool */
1831 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
1833 /* add io space for sg data */
1834 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
1835 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
1837 return desired_io;
1840 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
1842 int rc;
1843 char *action = "reset";
1845 if (hostdata->reset_crq) {
1846 smp_rmb();
1847 hostdata->reset_crq = 0;
1849 rc = ibmvscsi_ops->reset_crq_queue(&hostdata->queue, hostdata);
1850 if (!rc)
1851 rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1852 vio_enable_interrupts(to_vio_dev(hostdata->dev));
1853 } else if (hostdata->reenable_crq) {
1854 smp_rmb();
1855 action = "enable";
1856 rc = ibmvscsi_ops->reenable_crq_queue(&hostdata->queue, hostdata);
1857 hostdata->reenable_crq = 0;
1858 if (!rc)
1859 rc = ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0);
1860 } else
1861 return;
1863 if (rc) {
1864 atomic_set(&hostdata->request_limit, -1);
1865 dev_err(hostdata->dev, "error after %s\n", action);
1868 scsi_unblock_requests(hostdata->host);
1871 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
1873 if (kthread_should_stop())
1874 return 1;
1875 else if (hostdata->reset_crq) {
1876 smp_rmb();
1877 return 1;
1878 } else if (hostdata->reenable_crq) {
1879 smp_rmb();
1880 return 1;
1883 return 0;
1886 static int ibmvscsi_work(void *data)
1888 struct ibmvscsi_host_data *hostdata = data;
1889 int rc;
1891 set_user_nice(current, -20);
1893 while (1) {
1894 rc = wait_event_interruptible(hostdata->work_wait_q,
1895 ibmvscsi_work_to_do(hostdata));
1897 BUG_ON(rc);
1899 if (kthread_should_stop())
1900 break;
1902 ibmvscsi_do_work(hostdata);
1905 return 0;
1909 * Called by bus code for each adapter
1911 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1913 struct ibmvscsi_host_data *hostdata;
1914 struct Scsi_Host *host;
1915 struct device *dev = &vdev->dev;
1916 struct srp_rport_identifiers ids;
1917 struct srp_rport *rport;
1918 unsigned long wait_switch = 0;
1919 int rc;
1921 dev_set_drvdata(&vdev->dev, NULL);
1923 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
1924 if (!host) {
1925 dev_err(&vdev->dev, "couldn't allocate host data\n");
1926 goto scsi_host_alloc_failed;
1929 host->transportt = ibmvscsi_transport_template;
1930 hostdata = shost_priv(host);
1931 memset(hostdata, 0x00, sizeof(*hostdata));
1932 INIT_LIST_HEAD(&hostdata->sent);
1933 init_waitqueue_head(&hostdata->work_wait_q);
1934 hostdata->host = host;
1935 hostdata->dev = dev;
1936 atomic_set(&hostdata->request_limit, -1);
1937 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
1939 if (map_persist_bufs(hostdata)) {
1940 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
1941 goto persist_bufs_failed;
1944 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
1945 "ibmvscsi", host->host_no);
1947 if (IS_ERR(hostdata->work_thread)) {
1948 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
1949 PTR_ERR(hostdata->work_thread));
1950 goto init_crq_failed;
1953 rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events);
1954 if (rc != 0 && rc != H_RESOURCE) {
1955 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
1956 goto kill_kthread;
1958 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
1959 dev_err(&vdev->dev, "couldn't initialize event pool\n");
1960 goto init_pool_failed;
1963 host->max_lun = 8;
1964 host->max_id = max_id;
1965 host->max_channel = max_channel;
1966 host->max_cmd_len = 16;
1968 if (scsi_add_host(hostdata->host, hostdata->dev))
1969 goto add_host_failed;
1971 /* we don't have a proper target_port_id so let's use the fake one */
1972 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
1973 sizeof(ids.port_id));
1974 ids.roles = SRP_RPORT_ROLE_TARGET;
1975 rport = srp_rport_add(host, &ids);
1976 if (IS_ERR(rport))
1977 goto add_srp_port_failed;
1979 /* Try to send an initialization message. Note that this is allowed
1980 * to fail if the other end is not acive. In that case we don't
1981 * want to scan
1983 if (ibmvscsi_ops->send_crq(hostdata, 0xC001000000000000LL, 0) == 0
1984 || rc == H_RESOURCE) {
1986 * Wait around max init_timeout secs for the adapter to finish
1987 * initializing. When we are done initializing, we will have a
1988 * valid request_limit. We don't want Linux scanning before
1989 * we are ready.
1991 for (wait_switch = jiffies + (init_timeout * HZ);
1992 time_before(jiffies, wait_switch) &&
1993 atomic_read(&hostdata->request_limit) < 2;) {
1995 msleep(10);
1998 /* if we now have a valid request_limit, initiate a scan */
1999 if (atomic_read(&hostdata->request_limit) > 0)
2000 scsi_scan_host(host);
2003 dev_set_drvdata(&vdev->dev, hostdata);
2004 return 0;
2006 add_srp_port_failed:
2007 scsi_remove_host(hostdata->host);
2008 add_host_failed:
2009 release_event_pool(&hostdata->pool, hostdata);
2010 init_pool_failed:
2011 ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events);
2012 kill_kthread:
2013 kthread_stop(hostdata->work_thread);
2014 init_crq_failed:
2015 unmap_persist_bufs(hostdata);
2016 persist_bufs_failed:
2017 scsi_host_put(host);
2018 scsi_host_alloc_failed:
2019 return -1;
2022 static int ibmvscsi_remove(struct vio_dev *vdev)
2024 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2025 unmap_persist_bufs(hostdata);
2026 release_event_pool(&hostdata->pool, hostdata);
2027 ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata,
2028 max_events);
2030 kthread_stop(hostdata->work_thread);
2031 srp_remove_host(hostdata->host);
2032 scsi_remove_host(hostdata->host);
2033 scsi_host_put(hostdata->host);
2035 return 0;
2039 * ibmvscsi_resume: Resume from suspend
2040 * @dev: device struct
2042 * We may have lost an interrupt across suspend/resume, so kick the
2043 * interrupt handler
2045 static int ibmvscsi_resume(struct device *dev)
2047 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2048 return ibmvscsi_ops->resume(hostdata);
2052 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we
2053 * support.
2055 static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
2056 {"vscsi", "IBM,v-scsi"},
2057 { "", "" }
2059 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2061 static struct dev_pm_ops ibmvscsi_pm_ops = {
2062 .resume = ibmvscsi_resume
2065 static struct vio_driver ibmvscsi_driver = {
2066 .id_table = ibmvscsi_device_table,
2067 .probe = ibmvscsi_probe,
2068 .remove = ibmvscsi_remove,
2069 .get_desired_dma = ibmvscsi_get_desired_dma,
2070 .driver = {
2071 .name = "ibmvscsi",
2072 .owner = THIS_MODULE,
2073 .pm = &ibmvscsi_pm_ops,
2077 static struct srp_function_template ibmvscsi_transport_functions = {
2080 int __init ibmvscsi_module_init(void)
2082 int ret;
2084 /* Ensure we have two requests to do error recovery */
2085 driver_template.can_queue = max_requests;
2086 max_events = max_requests + 2;
2088 if (firmware_has_feature(FW_FEATURE_ISERIES))
2089 ibmvscsi_ops = &iseriesvscsi_ops;
2090 else if (firmware_has_feature(FW_FEATURE_VIO))
2091 ibmvscsi_ops = &rpavscsi_ops;
2092 else
2093 return -ENODEV;
2095 ibmvscsi_transport_template =
2096 srp_attach_transport(&ibmvscsi_transport_functions);
2097 if (!ibmvscsi_transport_template)
2098 return -ENOMEM;
2100 ret = vio_register_driver(&ibmvscsi_driver);
2101 if (ret)
2102 srp_release_transport(ibmvscsi_transport_template);
2103 return ret;
2106 void __exit ibmvscsi_module_exit(void)
2108 vio_unregister_driver(&ibmvscsi_driver);
2109 srp_release_transport(ibmvscsi_transport_template);
2112 module_init(ibmvscsi_module_init);
2113 module_exit(ibmvscsi_module_exit);