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SCSI host lock push-down
[linux-2.6-block.git] / drivers / scsi / libsas / sas_scsi_host.c
CommitLineData
2908d778
JB		 1/*
2 * Serial Attached SCSI (SAS) class SCSI Host glue.
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 */
25
d7a54e30 26#include <linux/kthread.h>
45e6cdf4
DW		 27#include <linux/firmware.h>
28#include <linux/ctype.h>
d7a54e30 29
2908d778
JB		 30#include "sas_internal.h"
31
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_tcq.h>
35#include <scsi/scsi.h>
f456393e 36#include <scsi/scsi_eh.h>
2908d778
JB		 37#include <scsi/scsi_transport.h>
38#include <scsi/scsi_transport_sas.h>
338ec570 39#include <scsi/sas_ata.h>
2908d778 40#include "../scsi_sas_internal.h"
79a5eb60 41#include "../scsi_transport_api.h"
ad689233 42#include "../scsi_priv.h"
2908d778
JB		 43
44#include <linux/err.h>
45#include <linux/blkdev.h>
83144186 46#include <linux/freezer.h>
5a0e3ad6 47#include <linux/gfp.h>
2908d778 48#include <linux/scatterlist.h>
fa1c1e8f 49#include <linux/libata.h>
2908d778
JB		 50
51/* ---------- SCSI Host glue ---------- */
52
2908d778
JB		 53static void sas_scsi_task_done(struct sas_task *task)
54{
55 struct task_status_struct *ts = &task->task_status;
56 struct scsi_cmnd *sc = task->uldd_task;
2908d778
JB		 57 int hs = 0, stat = 0;
58
a8e14fec
JB		 59 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
60 /* Aborted tasks will be completed by the error handler */
61 SAS_DPRINTK("task done but aborted\n");
62 return;
63 }
64
2908d778
JB		 65 if (unlikely(!sc)) {
66 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
67 list_del_init(&task->list);
68 sas_free_task(task);
69 return;
70 }
71
72 if (ts->resp == SAS_TASK_UNDELIVERED) {
73 /* transport error */
74 hs = DID_NO_CONNECT;
75 } else { /* ts->resp == SAS_TASK_COMPLETE */
76 /* task delivered, what happened afterwards? */
77 switch (ts->stat) {
78 case SAS_DEV_NO_RESPONSE:
79 case SAS_INTERRUPTED:
80 case SAS_PHY_DOWN:
81 case SAS_NAK_R_ERR:
82 case SAS_OPEN_TO:
83 hs = DID_NO_CONNECT;
84 break;
85 case SAS_DATA_UNDERRUN:
c13e5566
FT		 86 scsi_set_resid(sc, ts->residual);
87 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
2908d778
JB		 88 hs = DID_ERROR;
89 break;
90 case SAS_DATA_OVERRUN:
91 hs = DID_ERROR;
92 break;
93 case SAS_QUEUE_FULL:
94 hs = DID_SOFT_ERROR; /* retry */
95 break;
96 case SAS_DEVICE_UNKNOWN:
97 hs = DID_BAD_TARGET;
98 break;
99 case SAS_SG_ERR:
100 hs = DID_PARITY;
101 break;
102 case SAS_OPEN_REJECT:
103 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
104 hs = DID_SOFT_ERROR; /* retry */
105 else
106 hs = DID_ERROR;
107 break;
108 case SAS_PROTO_RESPONSE:
109 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
110 "task; please report this\n",
111 task->dev->port->ha->sas_ha_name);
112 break;
113 case SAS_ABORTED_TASK:
114 hs = DID_ABORT;
115 break;
df64d3ca 116 case SAM_STAT_CHECK_CONDITION:
2908d778 117 memcpy(sc->sense_buffer, ts->buf,
cc75e8ab 118 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
df64d3ca 119 stat = SAM_STAT_CHECK_CONDITION;
2908d778
JB		 120 break;
121 default:
122 stat = ts->stat;
123 break;
124 }
125 }
126 ASSIGN_SAS_TASK(sc, NULL);
127 sc->result = (hs << 16) | stat;
128 list_del_init(&task->list);
129 sas_free_task(task);
a8e14fec 130 sc->scsi_done(sc);
2908d778
JB		 131}
132
2908d778
JB		 133static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
134 struct domain_device *dev,
3cc27547 135 gfp_t gfp_flags)
2908d778
JB		 136{
137 struct sas_task *task = sas_alloc_task(gfp_flags);
138 struct scsi_lun lun;
139
140 if (!task)
141 return NULL;
142
2908d778
JB		 143 task->uldd_task = cmd;
144 ASSIGN_SAS_TASK(cmd, task);
145
146 task->dev = dev;
147 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
148
149 task->ssp_task.retry_count = 1;
150 int_to_scsilun(cmd->device->lun, &lun);
151 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
9cbbdca4 152 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
2908d778
JB		 153 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
154
c13e5566
FT		 155 task->scatter = scsi_sglist(cmd);
156 task->num_scatter = scsi_sg_count(cmd);
157 task->total_xfer_len = scsi_bufflen(cmd);
2908d778
JB		 158 task->data_dir = cmd->sc_data_direction;
159
160 task->task_done = sas_scsi_task_done;
161
162 return task;
163}
164
338ec570 165int sas_queue_up(struct sas_task *task)
2908d778
JB		 166{
167 struct sas_ha_struct *sas_ha = task->dev->port->ha;
168 struct scsi_core *core = &sas_ha->core;
169 unsigned long flags;
170 LIST_HEAD(list);
171
172 spin_lock_irqsave(&core->task_queue_lock, flags);
173 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
174 spin_unlock_irqrestore(&core->task_queue_lock, flags);
175 return -SAS_QUEUE_FULL;
176 }
177 list_add_tail(&task->list, &core->task_queue);
178 core->task_queue_size += 1;
179 spin_unlock_irqrestore(&core->task_queue_lock, flags);
d7a54e30 180 wake_up_process(core->queue_thread);
2908d778
JB		 181
182 return 0;
183}
184
185/**
186 * sas_queuecommand -- Enqueue a command for processing
187 * @parameters: See SCSI Core documentation
188 *
189 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
190 * call us without holding an IRQ spinlock...
191 */
f281233d 192static int sas_queuecommand_lck(struct scsi_cmnd *cmd,
2908d778 193 void (*scsi_done)(struct scsi_cmnd *))
8ee24023
DW		 194 __releases(host->host_lock)
195 __acquires(dev->sata_dev.ap->lock)
196 __releases(dev->sata_dev.ap->lock)
197 __acquires(host->host_lock)
2908d778
JB		 198{
199 int res = 0;
200 struct domain_device *dev = cmd_to_domain_dev(cmd);
201 struct Scsi_Host *host = cmd->device->host;
202 struct sas_internal *i = to_sas_internal(host->transportt);
203
204 spin_unlock_irq(host->host_lock);
205
206 {
207 struct sas_ha_struct *sas_ha = dev->port->ha;
208 struct sas_task *task;
209
fa1c1e8f 210 if (dev_is_sata(dev)) {
3eb7a51a
DW		 211 unsigned long flags;
212
213 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
fa1c1e8f
DW		 214 res = ata_sas_queuecmd(cmd, scsi_done,
215 dev->sata_dev.ap);
3eb7a51a 216 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
fa1c1e8f
DW		 217 goto out;
218 }
219
56dd2c06
DW		 220 /* If the device fell off, no sense in issuing commands */
221 if (dev->gone) {
222 cmd->result = DID_BAD_TARGET << 16;
223 scsi_done(cmd);
224 goto out;
225 }
226
2908d778
JB		 227 res = -ENOMEM;
228 task = sas_create_task(cmd, dev, GFP_ATOMIC);
229 if (!task)
230 goto out;
231
232 cmd->scsi_done = scsi_done;
233 /* Queue up, Direct Mode or Task Collector Mode. */
234 if (sas_ha->lldd_max_execute_num < 2)
235 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
236 else
237 res = sas_queue_up(task);
238
239 /* Examine */
240 if (res) {
241 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
242 ASSIGN_SAS_TASK(cmd, NULL);
243 sas_free_task(task);
244 if (res == -SAS_QUEUE_FULL) {
245 cmd->result = DID_SOFT_ERROR << 16; /* retry */
246 res = 0;
247 scsi_done(cmd);
248 }
249 goto out;
250 }
251 }
252out:
253 spin_lock_irq(host->host_lock);
254 return res;
255}
256
f281233d
JG		 257DEF_SCSI_QCMD(sas_queuecommand)
258
a8e14fec
JB		 259static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
260{
261 struct sas_task *task = TO_SAS_TASK(cmd);
262 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
263
264 /* remove the aborted task flag to allow the task to be
265 * completed now. At this point, we only get called following
266 * an actual abort of the task, so we should be guaranteed not
267 * to be racing with any completions from the LLD (hence we
268 * don't need the task state lock to clear the flag) */
269 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
270 /* Now call task_done. However, task will be free'd after
271 * this */
272 task->task_done(task);
273 /* now finish the command and move it on to the error
274 * handler done list, this also takes it off the
275 * error handler pending list */
276 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
277}
278
2908d778
JB		 279static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
280{
281 struct scsi_cmnd *cmd, *n;
282
283 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
63e4563b
JB		 284 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
285 cmd->device->lun == my_cmd->device->lun)
a8e14fec 286 sas_eh_finish_cmd(cmd);
2908d778
JB		 287 }
288}
289
290static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
291 struct domain_device *dev)
292{
293 struct scsi_cmnd *cmd, *n;
294
295 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
296 struct domain_device *x = cmd_to_domain_dev(cmd);
297
298 if (x == dev)
a8e14fec 299 sas_eh_finish_cmd(cmd);
2908d778
JB		 300 }
301}
302
303static void sas_scsi_clear_queue_port(struct list_head *error_q,
304 struct asd_sas_port *port)
305{
306 struct scsi_cmnd *cmd, *n;
307
308 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
309 struct domain_device *dev = cmd_to_domain_dev(cmd);
310 struct asd_sas_port *x = dev->port;
311
312 if (x == port)
a8e14fec 313 sas_eh_finish_cmd(cmd);
2908d778
JB		 314 }
315}
316
317enum task_disposition {
318 TASK_IS_DONE,
319 TASK_IS_ABORTED,
320 TASK_IS_AT_LU,
321 TASK_IS_NOT_AT_LU,
02cd743b 322 TASK_ABORT_FAILED,
2908d778
JB		 323};
324
325static enum task_disposition sas_scsi_find_task(struct sas_task *task)
326{
327 struct sas_ha_struct *ha = task->dev->port->ha;
328 unsigned long flags;
329 int i, res;
330 struct sas_internal *si =
331 to_sas_internal(task->dev->port->ha->core.shost->transportt);
332
333 if (ha->lldd_max_execute_num > 1) {
334 struct scsi_core *core = &ha->core;
335 struct sas_task *t, *n;
336
337 spin_lock_irqsave(&core->task_queue_lock, flags);
338 list_for_each_entry_safe(t, n, &core->task_queue, list) {
339 if (task == t) {
340 list_del_init(&t->list);
341 spin_unlock_irqrestore(&core->task_queue_lock,
342 flags);
343 SAS_DPRINTK("%s: task 0x%p aborted from "
344 "task_queue\n",
cadbd4a5 345 __func__, task);
2908d778
JB		 346 return TASK_IS_ABORTED;
347 }
348 }
349 spin_unlock_irqrestore(&core->task_queue_lock, flags);
350 }
351
352 for (i = 0; i < 5; i++) {
cadbd4a5 353 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
2908d778
JB		 354 res = si->dft->lldd_abort_task(task);
355
356 spin_lock_irqsave(&task->task_state_lock, flags);
357 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
358 spin_unlock_irqrestore(&task->task_state_lock, flags);
cadbd4a5 359 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
2908d778
JB		 360 task);
361 return TASK_IS_DONE;
362 }
363 spin_unlock_irqrestore(&task->task_state_lock, flags);
364
365 if (res == TMF_RESP_FUNC_COMPLETE) {
366 SAS_DPRINTK("%s: task 0x%p is aborted\n",
cadbd4a5 367 __func__, task);
2908d778
JB		 368 return TASK_IS_ABORTED;
369 } else if (si->dft->lldd_query_task) {
370 SAS_DPRINTK("%s: querying task 0x%p\n",
cadbd4a5 371 __func__, task);
2908d778 372 res = si->dft->lldd_query_task(task);
02cd743b
DW		 373 switch (res) {
374 case TMF_RESP_FUNC_SUCC:
2908d778 375 SAS_DPRINTK("%s: task 0x%p at LU\n",
cadbd4a5 376 __func__, task);
2908d778 377 return TASK_IS_AT_LU;
02cd743b 378 case TMF_RESP_FUNC_COMPLETE:
2908d778 379 SAS_DPRINTK("%s: task 0x%p not at LU\n",
cadbd4a5 380 __func__, task);
2908d778 381 return TASK_IS_NOT_AT_LU;
02cd743b
DW		 382 case TMF_RESP_FUNC_FAILED:
383 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
cadbd4a5 384 __func__, task);
02cd743b
DW		 385 return TASK_ABORT_FAILED;
386 }
387
2908d778
JB		 388 }
389 }
390 return res;
391}
392
393static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
394{
395 int res = TMF_RESP_FUNC_FAILED;
396 struct scsi_lun lun;
397 struct sas_internal *i =
398 to_sas_internal(dev->port->ha->core.shost->transportt);
399
400 int_to_scsilun(cmd->device->lun, &lun);
401
402 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
403 SAS_ADDR(dev->sas_addr),
404 cmd->device->lun);
405
406 if (i->dft->lldd_abort_task_set)
407 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
408
409 if (res == TMF_RESP_FUNC_FAILED) {
410 if (i->dft->lldd_clear_task_set)
411 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
412 }
413
414 if (res == TMF_RESP_FUNC_FAILED) {
415 if (i->dft->lldd_lu_reset)
416 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
417 }
418
419 return res;
420}
421
422static int sas_recover_I_T(struct domain_device *dev)
423{
424 int res = TMF_RESP_FUNC_FAILED;
425 struct sas_internal *i =
426 to_sas_internal(dev->port->ha->core.shost->transportt);
427
428 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
429 SAS_ADDR(dev->sas_addr));
430
431 if (i->dft->lldd_I_T_nexus_reset)
432 res = i->dft->lldd_I_T_nexus_reset(dev);
433
434 return res;
435}
436
ad689233 437/* Find the sas_phy that's attached to this device */
5319578c 438struct sas_phy *sas_find_local_phy(struct domain_device *dev)
3ebf6922 439{
ad689233
DW		 440 struct domain_device *pdev = dev->parent;
441 struct ex_phy *exphy = NULL;
442 int i;
443
444 /* Directly attached device */
445 if (!pdev)
446 return dev->port->phy;
3ebf6922 447
ad689233
DW		 448 /* Otherwise look in the expander */
449 for (i = 0; i < pdev->ex_dev.num_phys; i++)
450 if (!memcmp(dev->sas_addr,
451 pdev->ex_dev.ex_phy[i].attached_sas_addr,
452 SAS_ADDR_SIZE)) {
453 exphy = &pdev->ex_dev.ex_phy[i];
454 break;
455 }
3ebf6922 456
ad689233
DW		 457 BUG_ON(!exphy);
458 return exphy->phy;
3ebf6922 459}
5319578c 460EXPORT_SYMBOL_GPL(sas_find_local_phy);
3ebf6922 461
a9344e68 462/* Attempt to send a LUN reset message to a device */
ad689233 463int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
a9344e68
DW		 464{
465 struct domain_device *dev = cmd_to_domain_dev(cmd);
466 struct sas_internal *i =
467 to_sas_internal(dev->port->ha->core.shost->transportt);
468 struct scsi_lun lun;
469 int res;
470
471 int_to_scsilun(cmd->device->lun, &lun);
472
473 if (!i->dft->lldd_lu_reset)
474 return FAILED;
475
476 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
477 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
478 return SUCCESS;
479
480 return FAILED;
481}
482
483/* Attempt to send a phy (bus) reset */
484int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
ad689233
DW		 485{
486 struct domain_device *dev = cmd_to_domain_dev(cmd);
5319578c 487 struct sas_phy *phy = sas_find_local_phy(dev);
ad689233
DW		 488 int res;
489
490 res = sas_phy_reset(phy, 1);
491 if (res)
a9344e68 492 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
af5ca3f4 493 kobject_name(&phy->dev.kobj),
ad689233
DW		 494 res);
495 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
496 return SUCCESS;
497
498 return FAILED;
499}
500
501/* Try to reset a device */
8de3ef25 502static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
ad689233 503{
a9344e68 504 int res;
8de3ef25 505 struct Scsi_Host *shost = cmd->device->host;
a9344e68 506
ad689233 507 if (!shost->hostt->eh_device_reset_handler)
a9344e68
DW		 508 goto try_bus_reset;
509
510 res = shost->hostt->eh_device_reset_handler(cmd);
511 if (res == SUCCESS)
512 return res;
ad689233 513
a9344e68
DW		 514try_bus_reset:
515 if (shost->hostt->eh_bus_reset_handler)
516 return shost->hostt->eh_bus_reset_handler(cmd);
517
518 return FAILED;
ad689233
DW		 519}
520
521static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
522 struct list_head *work_q,
523 struct list_head *done_q)
2908d778 524{
2908d778
JB		 525 struct scsi_cmnd *cmd, *n;
526 enum task_disposition res = TASK_IS_DONE;
3ebf6922 527 int tmf_resp, need_reset;
2908d778 528 struct sas_internal *i = to_sas_internal(shost->transportt);
ad689233
DW		 529 unsigned long flags;
530 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
2908d778 531
2908d778 532Again:
ad689233 533 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
2908d778
JB		 534 struct sas_task *task = TO_SAS_TASK(cmd);
535
ad689233 536 if (!task)
f456393e 537 continue;
ad689233
DW		 538
539 list_del_init(&cmd->eh_entry);
3ebf6922
DW		 540
541 spin_lock_irqsave(&task->task_state_lock, flags);
542 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
3ebf6922
DW		 543 spin_unlock_irqrestore(&task->task_state_lock, flags);
544
8de3ef25
JB		 545 if (need_reset) {
546 SAS_DPRINTK("%s: task 0x%p requests reset\n",
cadbd4a5 547 __func__, task);
8de3ef25
JB		 548 goto reset;
549 }
550
2908d778 551 SAS_DPRINTK("trying to find task 0x%p\n", task);
2908d778
JB		 552 res = sas_scsi_find_task(task);
553
554 cmd->eh_eflags = 0;
2908d778
JB		 555
556 switch (res) {
557 case TASK_IS_DONE:
cadbd4a5 558 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
2908d778 559 task);
a8e14fec 560 sas_eh_finish_cmd(cmd);
2908d778
JB		 561 continue;
562 case TASK_IS_ABORTED:
563 SAS_DPRINTK("%s: task 0x%p is aborted\n",
cadbd4a5 564 __func__, task);
a8e14fec 565 sas_eh_finish_cmd(cmd);
2908d778
JB		 566 continue;
567 case TASK_IS_AT_LU:
568 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
8de3ef25 569 reset:
2908d778
JB		 570 tmf_resp = sas_recover_lu(task->dev, cmd);
571 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
572 SAS_DPRINTK("dev %016llx LU %x is "
573 "recovered\n",
574 SAS_ADDR(task->dev),
575 cmd->device->lun);
a8e14fec 576 sas_eh_finish_cmd(cmd);
ad689233 577 sas_scsi_clear_queue_lu(work_q, cmd);
2908d778
JB		 578 goto Again;
579 }
580 /* fallthrough */
581 case TASK_IS_NOT_AT_LU:
02cd743b 582 case TASK_ABORT_FAILED:
2908d778
JB		 583 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
584 task);
585 tmf_resp = sas_recover_I_T(task->dev);
586 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
8de3ef25 587 struct domain_device *dev = task->dev;
2908d778
JB		 588 SAS_DPRINTK("I_T %016llx recovered\n",
589 SAS_ADDR(task->dev->sas_addr));
a8e14fec 590 sas_eh_finish_cmd(cmd);
8de3ef25 591 sas_scsi_clear_queue_I_T(work_q, dev);
2908d778
JB		 592 goto Again;
593 }
594 /* Hammer time :-) */
8de3ef25 595 try_to_reset_cmd_device(cmd);
2908d778
JB		 596 if (i->dft->lldd_clear_nexus_port) {
597 struct asd_sas_port *port = task->dev->port;
598 SAS_DPRINTK("clearing nexus for port:%d\n",
599 port->id);
600 res = i->dft->lldd_clear_nexus_port(port);
601 if (res == TMF_RESP_FUNC_COMPLETE) {
602 SAS_DPRINTK("clear nexus port:%d "
603 "succeeded\n", port->id);
a8e14fec 604 sas_eh_finish_cmd(cmd);
ad689233 605 sas_scsi_clear_queue_port(work_q,
2908d778
JB		 606 port);
607 goto Again;
608 }
609 }
610 if (i->dft->lldd_clear_nexus_ha) {
611 SAS_DPRINTK("clear nexus ha\n");
612 res = i->dft->lldd_clear_nexus_ha(ha);
613 if (res == TMF_RESP_FUNC_COMPLETE) {
614 SAS_DPRINTK("clear nexus ha "
615 "succeeded\n");
a8e14fec 616 sas_eh_finish_cmd(cmd);
a8e14fec 617 goto clear_q;
2908d778
JB		 618 }
619 }
620 /* If we are here -- this means that no amount
621 * of effort could recover from errors. Quite
622 * possibly the HA just disappeared.
623 */
624 SAS_DPRINTK("error from device %llx, LUN %x "
625 "couldn't be recovered in any way\n",
626 SAS_ADDR(task->dev->sas_addr),
627 cmd->device->lun);
628
a8e14fec 629 sas_eh_finish_cmd(cmd);
2908d778
JB		 630 goto clear_q;
631 }
632 }
ad689233 633 return list_empty(work_q);
2908d778 634clear_q:
cadbd4a5 635 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
a8e14fec
JB		 636 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
637 sas_eh_finish_cmd(cmd);
638
ad689233
DW		 639 return list_empty(work_q);
640}
641
642void sas_scsi_recover_host(struct Scsi_Host *shost)
643{
644 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
645 unsigned long flags;
646 LIST_HEAD(eh_work_q);
647
648 spin_lock_irqsave(shost->host_lock, flags);
649 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
650 spin_unlock_irqrestore(shost->host_lock, flags);
651
cadbd4a5 652 SAS_DPRINTK("Enter %s\n", __func__);
ad689233
DW		 653 /*
654 * Deal with commands that still have SAS tasks (i.e. they didn't
655 * complete via the normal sas_task completion mechanism)
656 */
657 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
658 goto out;
659
660 /*
661 * Now deal with SCSI commands that completed ok but have a an error
662 * code (and hopefully sense data) attached. This is roughly what
663 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
664 * command we see here has no sas_task and is thus unknown to the HA.
665 */
666 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
667 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
668
669out:
670 scsi_eh_flush_done_q(&ha->eh_done_q);
cadbd4a5 671 SAS_DPRINTK("--- Exit %s\n", __func__);
ad689233 672 return;
2908d778
JB		 673}
674
242f9dcb 675enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
2908d778
JB		 676{
677 struct sas_task *task = TO_SAS_TASK(cmd);
678 unsigned long flags;
679
680 if (!task) {
242f9dcb 681 cmd->request->timeout /= 2;
6d4dcd4d 682 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
242f9dcb
JA		 683 cmd, task, (cmd->request->timeout ?
684 "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
685 if (!cmd->request->timeout)
686 return BLK_EH_NOT_HANDLED;
687 return BLK_EH_RESET_TIMER;
2908d778
JB		 688 }
689
690 spin_lock_irqsave(&task->task_state_lock, flags);
396819fb 691 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
2908d778
JB		 692 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
693 spin_unlock_irqrestore(&task->task_state_lock, flags);
242f9dcb
JA		 694 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
695 "BLK_EH_HANDLED\n", cmd, task);
696 return BLK_EH_HANDLED;
2908d778 697 }
b218a0d8
DW		 698 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
699 spin_unlock_irqrestore(&task->task_state_lock, flags);
700 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
242f9dcb 701 "BLK_EH_RESET_TIMER\n",
b218a0d8 702 cmd, task);
242f9dcb 703 return BLK_EH_RESET_TIMER;
b218a0d8 704 }
2908d778
JB		 705 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
706 spin_unlock_irqrestore(&task->task_state_lock, flags);
707
242f9dcb 708 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
2908d778
JB		 709 cmd, task);
710
242f9dcb 711 return BLK_EH_NOT_HANDLED;
2908d778
JB		 712}
713
fa1c1e8f
DW		 714int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
715{
716 struct domain_device *dev = sdev_to_domain_dev(sdev);
717
718 if (dev_is_sata(dev))
94be9a58 719 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
fa1c1e8f
DW		 720
721 return -EINVAL;
722}
723
2908d778
JB		 724struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
725{
726 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
727 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
728 struct domain_device *found_dev = NULL;
729 int i;
980fa2f9 730 unsigned long flags;
2908d778 731
980fa2f9 732 spin_lock_irqsave(&ha->phy_port_lock, flags);
2908d778
JB		 733 for (i = 0; i < ha->num_phys; i++) {
734 struct asd_sas_port *port = ha->sas_port[i];
735 struct domain_device *dev;
736
737 spin_lock(&port->dev_list_lock);
738 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
739 if (rphy == dev->rphy) {
740 found_dev = dev;
741 spin_unlock(&port->dev_list_lock);
742 goto found;
743 }
744 }
745 spin_unlock(&port->dev_list_lock);
746 }
747 found:
980fa2f9 748 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
2908d778
JB		 749
750 return found_dev;
751}
752
753static inline struct domain_device *sas_find_target(struct scsi_target *starget)
754{
755 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
756
757 return sas_find_dev_by_rphy(rphy);
758}
759
760int sas_target_alloc(struct scsi_target *starget)
761{
762 struct domain_device *found_dev = sas_find_target(starget);
338ec570 763 int res;
2908d778
JB		 764
765 if (!found_dev)
766 return -ENODEV;
767
fa1c1e8f 768 if (dev_is_sata(found_dev)) {
338ec570
DW		 769 res = sas_ata_init_host_and_port(found_dev, starget);
770 if (res)
771 return res;
fa1c1e8f
DW		 772 }
773
2908d778
JB		 774 starget->hostdata = found_dev;
775 return 0;
776}
777
778#define SAS_DEF_QD 32
779#define SAS_MAX_QD 64
780
781int sas_slave_configure(struct scsi_device *scsi_dev)
782{
783 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
784 struct sas_ha_struct *sas_ha;
785
786 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
787
fa1c1e8f
DW		 788 if (dev_is_sata(dev)) {
789 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
790 return 0;
791 }
792
2908d778
JB		 793 sas_ha = dev->port->ha;
794
795 sas_read_port_mode_page(scsi_dev);
796
797 if (scsi_dev->tagged_supported) {
798 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
799 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
800 } else {
801 SAS_DPRINTK("device %llx, LUN %x doesn't support "
802 "TCQ\n", SAS_ADDR(dev->sas_addr),
803 scsi_dev->lun);
804 scsi_dev->tagged_supported = 0;
805 scsi_set_tag_type(scsi_dev, 0);
806 scsi_deactivate_tcq(scsi_dev, 1);
807 }
808
f27708fc
DW		 809 scsi_dev->allow_restart = 1;
810
2908d778
JB		 811 return 0;
812}
813
814void sas_slave_destroy(struct scsi_device *scsi_dev)
815{
fa1c1e8f
DW		 816 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
817
818 if (dev_is_sata(dev))
3e4ec344 819 dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
2908d778
JB		 820}
821
e881a172
MC		 822int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
823 int reason)
2908d778
JB		 824{
825 int res = min(new_depth, SAS_MAX_QD);
826
e881a172
MC		 827 if (reason != SCSI_QDEPTH_DEFAULT)
828 return -EOPNOTSUPP;
829
2908d778
JB		 830 if (scsi_dev->tagged_supported)
831 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
832 res);
833 else {
834 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
835 sas_printk("device %llx LUN %x queue depth changed to 1\n",
836 SAS_ADDR(dev->sas_addr),
837 scsi_dev->lun);
838 scsi_adjust_queue_depth(scsi_dev, 0, 1);
839 res = 1;
840 }
841
842 return res;
843}
844
845int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
846{
847 if (!scsi_dev->tagged_supported)
848 return 0;
849
850 scsi_deactivate_tcq(scsi_dev, 1);
851
852 scsi_set_tag_type(scsi_dev, qt);
853 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
854
855 return qt;
856}
857
858int sas_bios_param(struct scsi_device *scsi_dev,
859 struct block_device *bdev,
860 sector_t capacity, int *hsc)
861{
862 hsc[0] = 255;
863 hsc[1] = 63;
864 sector_div(capacity, 255*63);
865 hsc[2] = capacity;
866
867 return 0;
868}
869
870/* ---------- Task Collector Thread implementation ---------- */
871
872static void sas_queue(struct sas_ha_struct *sas_ha)
873{
874 struct scsi_core *core = &sas_ha->core;
875 unsigned long flags;
876 LIST_HEAD(q);
877 int can_queue;
878 int res;
879 struct sas_internal *i = to_sas_internal(core->shost->transportt);
880
881 spin_lock_irqsave(&core->task_queue_lock, flags);
d7a54e30 882 while (!kthread_should_stop() &&
2908d778
JB		 883 !list_empty(&core->task_queue)) {
884
885 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
886 if (can_queue >= 0) {
887 can_queue = core->task_queue_size;
888 list_splice_init(&core->task_queue, &q);
889 } else {
890 struct list_head *a, *n;
891
892 can_queue = sas_ha->lldd_queue_size;
893 list_for_each_safe(a, n, &core->task_queue) {
894 list_move_tail(a, &q);
895 if (--can_queue == 0)
896 break;
897 }
898 can_queue = sas_ha->lldd_queue_size;
899 }
900 core->task_queue_size -= can_queue;
901 spin_unlock_irqrestore(&core->task_queue_lock, flags);
902 {
903 struct sas_task *task = list_entry(q.next,
904 struct sas_task,
905 list);
906 list_del_init(&q);
907 res = i->dft->lldd_execute_task(task, can_queue,
908 GFP_KERNEL);
909 if (unlikely(res))
910 __list_add(&q, task->list.prev, &task->list);
911 }
912 spin_lock_irqsave(&core->task_queue_lock, flags);
913 if (res) {
914 list_splice_init(&q, &core->task_queue); /*at head*/
915 core->task_queue_size += can_queue;
916 }
917 }
918 spin_unlock_irqrestore(&core->task_queue_lock, flags);
919}
920
2908d778
JB		 921/**
922 * sas_queue_thread -- The Task Collector thread
923 * @_sas_ha: pointer to struct sas_ha
924 */
925static int sas_queue_thread(void *_sas_ha)
926{
927 struct sas_ha_struct *sas_ha = _sas_ha;
2908d778 928
2908d778 929 while (1) {
d7a54e30
CH		 930 set_current_state(TASK_INTERRUPTIBLE);
931 schedule();
2908d778 932 sas_queue(sas_ha);
d7a54e30 933 if (kthread_should_stop())
2908d778
JB		 934 break;
935 }
936
2908d778
JB		 937 return 0;
938}
939
940int sas_init_queue(struct sas_ha_struct *sas_ha)
941{
2908d778
JB		 942 struct scsi_core *core = &sas_ha->core;
943
944 spin_lock_init(&core->task_queue_lock);
945 core->task_queue_size = 0;
946 INIT_LIST_HEAD(&core->task_queue);
2908d778 947
d7a54e30
CH		 948 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
949 "sas_queue_%d", core->shost->host_no);
950 if (IS_ERR(core->queue_thread))
951 return PTR_ERR(core->queue_thread);
952 return 0;
2908d778
JB		 953}
954
955void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
956{
957 unsigned long flags;
958 struct scsi_core *core = &sas_ha->core;
959 struct sas_task *task, *n;
960
d7a54e30 961 kthread_stop(core->queue_thread);
2908d778
JB		 962
963 if (!list_empty(&core->task_queue))
964 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
965 SAS_ADDR(sas_ha->sas_addr));
966
967 spin_lock_irqsave(&core->task_queue_lock, flags);
968 list_for_each_entry_safe(task, n, &core->task_queue, list) {
969 struct scsi_cmnd *cmd = task->uldd_task;
970
971 list_del_init(&task->list);
972
973 ASSIGN_SAS_TASK(cmd, NULL);
974 sas_free_task(task);
975 cmd->result = DID_ABORT << 16;
976 cmd->scsi_done(cmd);
977 }
978 spin_unlock_irqrestore(&core->task_queue_lock, flags);
979}
980
396819fb
DW		 981/*
982 * Call the LLDD task abort routine directly. This function is intended for
983 * use by upper layers that need to tell the LLDD to abort a task.
984 */
985int __sas_task_abort(struct sas_task *task)
79a5eb60 986{
79a5eb60
DW		 987 struct sas_internal *si =
988 to_sas_internal(task->dev->port->ha->core.shost->transportt);
989 unsigned long flags;
990 int res;
991
992 spin_lock_irqsave(&task->task_state_lock, flags);
396819fb
DW		 993 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
994 task->task_state_flags & SAS_TASK_STATE_DONE) {
79a5eb60 995 spin_unlock_irqrestore(&task->task_state_lock, flags);
cadbd4a5 996 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
79a5eb60
DW		 997 task);
998 return 0;
999 }
396819fb 1000 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
79a5eb60
DW		 1001 spin_unlock_irqrestore(&task->task_state_lock, flags);
1002
1003 if (!si->dft->lldd_abort_task)
1004 return -ENODEV;
1005
1006 res = si->dft->lldd_abort_task(task);
396819fb
DW		 1007
1008 spin_lock_irqsave(&task->task_state_lock, flags);
79a5eb60
DW		 1009 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1010 (res == TMF_RESP_FUNC_COMPLETE))
1011 {
396819fb
DW		 1012 spin_unlock_irqrestore(&task->task_state_lock, flags);
1013 task->task_done(task);
79a5eb60
DW		 1014 return 0;
1015 }
1016
79a5eb60
DW		 1017 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1018 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1019 spin_unlock_irqrestore(&task->task_state_lock, flags);
1020
1021 return -EAGAIN;
1022}
1023
396819fb
DW		 1024/*
1025 * Tell an upper layer that it needs to initiate an abort for a given task.
1026 * This should only ever be called by an LLDD.
1027 */
1028void sas_task_abort(struct sas_task *task)
79a5eb60 1029{
396819fb 1030 struct scsi_cmnd *sc = task->uldd_task;
79a5eb60 1031
396819fb
DW		 1032 /* Escape for libsas internal commands */
1033 if (!sc) {
1034 if (!del_timer(&task->timer))
79a5eb60 1035 return;
396819fb
DW		 1036 task->timer.function(task->timer.data);
1037 return;
1038 }
79a5eb60 1039
3a2755af
DW		 1040 if (dev_is_sata(task->dev)) {
1041 sas_ata_task_abort(task);
1b4d0d8e
JB		 1042 } else {
1043 struct request_queue *q = sc->device->request_queue;
1044 unsigned long flags;
3a2755af 1045
1b4d0d8e
JB		 1046 spin_lock_irqsave(q->queue_lock, flags);
1047 blk_abort_request(sc->request);
1048 spin_unlock_irqrestore(q->queue_lock, flags);
1049 scsi_schedule_eh(sc->device->host);
1050 }
79a5eb60
DW		 1051}
1052
fa1c1e8f
DW		 1053int sas_slave_alloc(struct scsi_device *scsi_dev)
1054{
1055 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1056
1057 if (dev_is_sata(dev))
1058 return ata_sas_port_init(dev->sata_dev.ap);
1059
1060 return 0;
1061}
1062
1063void sas_target_destroy(struct scsi_target *starget)
1064{
1065 struct domain_device *found_dev = sas_find_target(starget);
1066
1067 if (!found_dev)
1068 return;
1069
1070 if (dev_is_sata(found_dev))
1071 ata_sas_port_destroy(found_dev->sata_dev.ap);
1072
1073 return;
1074}
1075
45e6cdf4
DW		 1076static void sas_parse_addr(u8 *sas_addr, const char *p)
1077{
1078 int i;
1079 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1080 u8 h, l;
1081 if (!*p)
1082 break;
1083 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1084 p++;
1085 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1086 p++;
1087 sas_addr[i] = (h<<4) | l;
1088 }
1089}
1090
1091#define SAS_STRING_ADDR_SIZE 16
1092
1093int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1094{
1095 int res;
1096 const struct firmware *fw;
1097
1098 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1099 if (res)
1100 return res;
1101
1102 if (fw->size < SAS_STRING_ADDR_SIZE) {
1103 res = -ENODEV;
1104 goto out;
1105 }
1106
1107 sas_parse_addr(addr, fw->data);
1108
1109out:
1110 release_firmware(fw);
1111 return res;
1112}
1113EXPORT_SYMBOL_GPL(sas_request_addr);
1114
2908d778
JB		 1115EXPORT_SYMBOL_GPL(sas_queuecommand);
1116EXPORT_SYMBOL_GPL(sas_target_alloc);
1117EXPORT_SYMBOL_GPL(sas_slave_configure);
1118EXPORT_SYMBOL_GPL(sas_slave_destroy);
1119EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1120EXPORT_SYMBOL_GPL(sas_change_queue_type);
1121EXPORT_SYMBOL_GPL(sas_bios_param);
396819fb 1122EXPORT_SYMBOL_GPL(__sas_task_abort);
79a5eb60 1123EXPORT_SYMBOL_GPL(sas_task_abort);
dea22214 1124EXPORT_SYMBOL_GPL(sas_phy_reset);
acbf167d 1125EXPORT_SYMBOL_GPL(sas_phy_enable);
ad689233 1126EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
a9344e68 1127EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
fa1c1e8f
DW		 1128EXPORT_SYMBOL_GPL(sas_slave_alloc);
1129EXPORT_SYMBOL_GPL(sas_target_destroy);
1130EXPORT_SYMBOL_GPL(sas_ioctl);
Linux 6.x block layer and io_uring tree(s)