2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 * Copyright (C) 2006 IBM Corporation
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * 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
24 #include <linux/scatterlist.h>
25 #include <linux/slab.h>
27 #include <scsi/sas_ata.h>
28 #include "sas_internal.h"
29 #include <scsi/scsi_host.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_tcq.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_sas.h>
35 #include "../scsi_sas_internal.h"
36 #include "../scsi_transport_api.h"
37 #include <scsi/scsi_eh.h>
39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
44 if (ts->resp == SAS_TASK_UNDELIVERED)
45 return AC_ERR_ATA_BUS;
47 /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
50 case SAS_DEV_NO_RESPONSE:
51 return AC_ERR_TIMEOUT;
56 return AC_ERR_ATA_BUS;
59 case SAS_DATA_UNDERRUN:
61 * Some programs that use the taskfile interface
62 * (smartctl in particular) can cause underrun
63 * problems. Ignore these errors, perhaps at our
68 case SAS_DATA_OVERRUN:
70 case SAS_DEVICE_UNKNOWN:
72 return AC_ERR_INVALID;
76 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
80 case SAM_STAT_CHECK_CONDITION:
81 case SAS_ABORTED_TASK:
84 case SAS_PROTO_RESPONSE:
85 /* This means the ending_fis has the error
86 * value; return 0 here to collect it */
93 static void sas_ata_task_done(struct sas_task *task)
95 struct ata_queued_cmd *qc = task->uldd_task;
96 struct domain_device *dev;
97 struct task_status_struct *stat = &task->task_status;
98 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
99 struct sas_ha_struct *sas_ha;
100 enum ata_completion_errors ac;
102 struct ata_link *link;
105 goto qc_already_gone;
107 dev = qc->ap->private_data;
108 sas_ha = dev->port->ha;
109 link = &dev->sata_dev.ap->link;
111 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
112 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
113 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
114 dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
115 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
117 if (!link->sactive) {
118 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
120 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
121 if (unlikely(link->eh_info.err_mask))
122 qc->flags |= ATA_QCFLAG_FAILED;
125 ac = sas_to_ata_err(stat);
127 SAS_DPRINTK("%s: SAS error %x\n", __func__,
129 /* We saw a SAS error. Send a vague error. */
130 if (!link->sactive) {
133 link->eh_info.err_mask |= AC_ERR_DEV;
134 qc->flags |= ATA_QCFLAG_FAILED;
137 dev->sata_dev.fis[3] = 0x04; /* status err */
138 dev->sata_dev.fis[2] = ATA_ERR;
142 qc->lldd_task = NULL;
144 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
146 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
149 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
150 * flag is set, then we must have come in via the libsas EH
151 * functions. When we exit this function, we need to put the
152 * scsi_cmnd on the list of finished errors. The ata_qc_complete
153 * call cleans up the libata side of things but we're protected
154 * from the scsi_cmnd going away because the scsi_cmnd is owned
155 * by the EH, making libata's call to scsi_done a NOP.
157 spin_lock_irqsave(&task->task_state_lock, flags);
158 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
159 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
160 spin_unlock_irqrestore(&task->task_state_lock, flags);
163 list_del_init(&task->list);
167 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
170 struct sas_task *task;
171 struct domain_device *dev = qc->ap->private_data;
172 struct sas_ha_struct *sas_ha = dev->port->ha;
173 struct Scsi_Host *host = sas_ha->core.shost;
174 struct sas_internal *i = to_sas_internal(host->transportt);
175 struct scatterlist *sg;
176 unsigned int xfer = 0;
179 /* If the device fell off, no sense in issuing commands */
181 return AC_ERR_SYSTEM;
183 task = sas_alloc_task(GFP_ATOMIC);
185 return AC_ERR_SYSTEM;
187 task->task_proto = SAS_PROTOCOL_STP;
188 task->task_done = sas_ata_task_done;
190 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
191 qc->tf.command == ATA_CMD_FPDMA_READ) {
192 /* Need to zero out the tag libata assigned us */
196 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
197 task->uldd_task = qc;
198 if (ata_is_atapi(qc->tf.protocol)) {
199 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
200 task->total_xfer_len = qc->nbytes;
201 task->num_scatter = qc->n_elem;
203 for_each_sg(qc->sg, sg, qc->n_elem, si)
204 xfer += sg_dma_len(sg);
206 task->total_xfer_len = xfer;
207 task->num_scatter = si;
210 task->data_dir = qc->dma_dir;
211 task->scatter = qc->sg;
212 task->ata_task.retry_count = 1;
213 task->task_state_flags = SAS_TASK_STATE_PENDING;
214 qc->lldd_task = task;
216 switch (qc->tf.protocol) {
218 task->ata_task.use_ncq = 1;
222 task->ata_task.dma_xfer = 1;
227 ASSIGN_SAS_TASK(qc->scsicmd, task);
229 if (sas_ha->lldd_max_execute_num < 2)
230 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
232 res = sas_queue_up(task);
236 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
239 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
241 return AC_ERR_SYSTEM;
247 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
249 struct domain_device *dev = qc->ap->private_data;
251 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
255 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
256 unsigned long deadline)
258 struct ata_port *ap = link->ap;
259 struct domain_device *dev = ap->private_data;
260 struct sas_internal *i =
261 to_sas_internal(dev->port->ha->core.shost->transportt);
262 int res = TMF_RESP_FUNC_FAILED;
265 if (i->dft->lldd_I_T_nexus_reset)
266 res = i->dft->lldd_I_T_nexus_reset(dev);
268 if (res != TMF_RESP_FUNC_COMPLETE) {
269 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
273 switch (dev->sata_dev.command_set) {
274 case ATA_COMMAND_SET:
275 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
276 *class = ATA_DEV_ATA;
278 case ATAPI_COMMAND_SET:
279 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
280 *class = ATA_DEV_ATAPI;
283 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
285 dev->sata_dev.command_set);
286 *class = ATA_DEV_UNKNOWN;
290 ap->cbl = ATA_CBL_SATA;
294 static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
295 unsigned long deadline)
297 struct ata_port *ap = link->ap;
298 struct domain_device *dev = ap->private_data;
299 struct sas_internal *i =
300 to_sas_internal(dev->port->ha->core.shost->transportt);
301 int res = TMF_RESP_FUNC_FAILED;
304 if (i->dft->lldd_ata_soft_reset)
305 res = i->dft->lldd_ata_soft_reset(dev);
307 if (res != TMF_RESP_FUNC_COMPLETE) {
308 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
312 switch (dev->sata_dev.command_set) {
313 case ATA_COMMAND_SET:
314 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
315 *class = ATA_DEV_ATA;
317 case ATAPI_COMMAND_SET:
318 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
319 *class = ATA_DEV_ATAPI;
322 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
323 __func__, dev->sata_dev.command_set);
324 *class = ATA_DEV_UNKNOWN;
328 ap->cbl = ATA_CBL_SATA;
332 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
334 if (qc->flags & ATA_QCFLAG_FAILED)
335 qc->err_mask |= AC_ERR_OTHER;
339 * Find the sas_task and kill it. By this point,
340 * libata has decided to kill the qc, so we needn't
341 * bother with sas_ata_task_done. But we still
342 * ought to abort the task.
344 struct sas_task *task = qc->lldd_task;
347 qc->lldd_task = NULL;
349 /* Should this be a AT(API) device reset? */
350 spin_lock_irqsave(&task->task_state_lock, flags);
351 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
352 spin_unlock_irqrestore(&task->task_state_lock, flags);
354 task->uldd_task = NULL;
355 __sas_task_abort(task);
360 static struct ata_port_operations sas_sata_ops = {
361 .prereset = ata_std_prereset,
362 .softreset = sas_ata_soft_reset,
363 .hardreset = sas_ata_hard_reset,
364 .postreset = ata_std_postreset,
365 .error_handler = ata_std_error_handler,
366 .post_internal_cmd = sas_ata_post_internal,
367 .qc_defer = ata_std_qc_defer,
368 .qc_prep = ata_noop_qc_prep,
369 .qc_issue = sas_ata_qc_issue,
370 .qc_fill_rtf = sas_ata_qc_fill_rtf,
371 .port_start = ata_sas_port_start,
372 .port_stop = ata_sas_port_stop,
375 static struct ata_port_info sata_port_info = {
376 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
377 .pio_mask = ATA_PIO4,
378 .mwdma_mask = ATA_MWDMA2,
379 .udma_mask = ATA_UDMA6,
380 .port_ops = &sas_sata_ops
383 int sas_ata_init_host_and_port(struct domain_device *found_dev,
384 struct scsi_target *starget)
386 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
387 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
390 ata_host_init(&found_dev->sata_dev.ata_host,
392 sata_port_info.flags,
394 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
398 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
402 ap->private_data = found_dev;
403 ap->cbl = ATA_CBL_SATA;
404 ap->scsi_host = shost;
405 found_dev->sata_dev.ap = ap;
410 void sas_ata_task_abort(struct sas_task *task)
412 struct ata_queued_cmd *qc = task->uldd_task;
413 struct completion *waiting;
415 /* Bounce SCSI-initiated commands to the SCSI EH */
417 struct request_queue *q = qc->scsicmd->device->request_queue;
420 spin_lock_irqsave(q->queue_lock, flags);
421 blk_abort_request(qc->scsicmd->request);
422 spin_unlock_irqrestore(q->queue_lock, flags);
423 scsi_schedule_eh(qc->scsicmd->device->host);
427 /* Internal command, fake a timeout and complete. */
428 qc->flags &= ~ATA_QCFLAG_ACTIVE;
429 qc->flags |= ATA_QCFLAG_FAILED;
430 qc->err_mask |= AC_ERR_TIMEOUT;
431 waiting = qc->private_data;
435 static void sas_task_timedout(unsigned long _task)
437 struct sas_task *task = (void *) _task;
440 spin_lock_irqsave(&task->task_state_lock, flags);
441 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
442 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
443 spin_unlock_irqrestore(&task->task_state_lock, flags);
445 complete(&task->completion);
448 static void sas_disc_task_done(struct sas_task *task)
450 if (!del_timer(&task->timer))
452 complete(&task->completion);
455 #define SAS_DEV_TIMEOUT 10
458 * sas_execute_task -- Basic task processing for discovery
459 * @task: the task to be executed
460 * @buffer: pointer to buffer to do I/O
461 * @size: size of @buffer
462 * @dma_dir: DMA direction. DMA_xxx
464 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
465 enum dma_data_direction dma_dir)
468 struct scatterlist *scatter = NULL;
469 struct task_status_struct *ts = &task->task_status;
472 struct sas_internal *i =
473 to_sas_internal(task->dev->port->ha->core.shost->transportt);
475 if (dma_dir != DMA_NONE) {
476 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
480 sg_init_one(scatter, buffer, size);
484 task->task_proto = task->dev->tproto;
485 task->scatter = scatter;
486 task->num_scatter = num_scatter;
487 task->total_xfer_len = size;
488 task->data_dir = dma_dir;
489 task->task_done = sas_disc_task_done;
490 if (dma_dir != DMA_NONE &&
491 sas_protocol_ata(task->task_proto)) {
492 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
498 for (retries = 0; retries < 5; retries++) {
499 task->task_state_flags = SAS_TASK_STATE_PENDING;
500 init_completion(&task->completion);
502 task->timer.data = (unsigned long) task;
503 task->timer.function = sas_task_timedout;
504 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
505 add_timer(&task->timer);
507 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
509 del_timer(&task->timer);
510 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
514 wait_for_completion(&task->completion);
516 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
518 SAS_DPRINTK("task aborted, flags:0x%x\n",
519 task->task_state_flags);
520 res2 = i->dft->lldd_abort_task(task);
521 SAS_DPRINTK("came back from abort task\n");
522 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
523 if (res2 == TMF_RESP_FUNC_COMPLETE)
524 continue; /* Retry the task */
529 if (task->task_status.stat == SAM_STAT_BUSY ||
530 task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
531 task->task_status.stat == SAS_QUEUE_FULL) {
532 SAS_DPRINTK("task: q busy, sleeping...\n");
533 schedule_timeout_interruptible(HZ);
534 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
535 struct scsi_sense_hdr shdr;
537 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
539 SAS_DPRINTK("couldn't normalize sense\n");
542 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
543 (shdr.sense_key == 2 && shdr.asc == 4 &&
545 SAS_DPRINTK("device %016llx LUN: %016llx "
546 "powering up or not ready yet, "
548 SAS_ADDR(task->dev->sas_addr),
549 SAS_ADDR(task->ssp_task.LUN));
551 schedule_timeout_interruptible(5*HZ);
552 } else if (shdr.sense_key == 1) {
555 } else if (shdr.sense_key == 5) {
558 SAS_DPRINTK("dev %016llx LUN: %016llx "
559 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
561 SAS_ADDR(task->dev->sas_addr),
562 SAS_ADDR(task->ssp_task.LUN),
564 shdr.asc, shdr.ascq);
566 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
567 task->task_status.stat != SAM_STAT_GOOD) {
568 SAS_DPRINTK("task finished with resp:0x%x, "
570 task->task_status.resp,
571 task->task_status.stat);
579 if (dma_dir != DMA_NONE) {
580 if (sas_protocol_ata(task->task_proto))
581 dma_unmap_sg(task->dev->port->ha->dev,
582 task->scatter, task->num_scatter,
590 /* ---------- SATA ---------- */
592 static void sas_get_ata_command_set(struct domain_device *dev)
594 struct dev_to_host_fis *fis =
595 (struct dev_to_host_fis *) dev->frame_rcvd;
597 if ((fis->sector_count == 1 && /* ATA */
603 (fis->sector_count == 0 && /* CE-ATA (mATA) */
607 (fis->device & ~0x10) == 0))
609 dev->sata_dev.command_set = ATA_COMMAND_SET;
611 else if ((fis->interrupt_reason == 1 && /* ATAPI */
613 fis->byte_count_low == 0x14 &&
614 fis->byte_count_high == 0xEB &&
615 (fis->device & ~0x10) == 0))
617 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
619 else if ((fis->sector_count == 1 && /* SEMB */
625 (fis->interrupt_reason == 1 && /* SATA PM */
627 fis->byte_count_low == 0x69 &&
628 fis->byte_count_high == 0x96 &&
629 (fis->device & ~0x10) == 0))
631 /* Treat it as a superset? */
632 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
636 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
637 * @dev: the device to send the command to
638 * @command: the command register
639 * @features: the features register
640 * @buffer: pointer to buffer to do I/O
641 * @size: size of @buffer
642 * @dma_dir: DMA direction. DMA_xxx
644 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
645 u8 features, void *buffer, int size,
646 enum dma_data_direction dma_dir)
649 struct sas_task *task;
650 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
654 task = sas_alloc_task(GFP_KERNEL);
660 task->ata_task.fis.fis_type = 0x27;
661 task->ata_task.fis.command = command;
662 task->ata_task.fis.features = features;
663 task->ata_task.fis.device = d2h_fis->device;
664 task->ata_task.retry_count = 1;
666 res = sas_execute_task(task, buffer, size, dma_dir);
673 #define ATA_IDENTIFY_DEV 0xEC
674 #define ATA_IDENTIFY_PACKET_DEV 0xA1
675 #define ATA_SET_FEATURES 0xEF
676 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
679 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
680 * @dev: STP/SATA device of interest (ATA/ATAPI)
682 * The LLDD has already been notified of this device, so that we can
683 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
684 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
685 * performance for this device.
687 static int sas_discover_sata_dev(struct domain_device *dev)
693 identify_x = kzalloc(512, GFP_KERNEL);
697 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
698 dev->sata_dev.identify_device = identify_x;
699 command = ATA_IDENTIFY_DEV;
701 dev->sata_dev.identify_packet_device = identify_x;
702 command = ATA_IDENTIFY_PACKET_DEV;
705 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
710 /* lives on the media? */
711 if (le16_to_cpu(identify_x[0]) & 4) {
712 /* incomplete response */
713 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
714 "dev %llx\n", SAS_ADDR(dev->sas_addr));
715 if (!(identify_x[83] & cpu_to_le16(1<<6)))
717 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
718 ATA_FEATURE_PUP_STBY_SPIN_UP,
723 schedule_timeout_interruptible(5*HZ); /* More time? */
724 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
730 /* XXX Hint: register this SATA device with SATL.
731 When this returns, dev->sata_dev->lu is alive and
733 sas_satl_register_dev(dev);
736 sas_fill_in_rphy(dev, dev->rphy);
740 dev->sata_dev.identify_packet_device = NULL;
741 dev->sata_dev.identify_device = NULL;
746 static int sas_discover_sata_pm(struct domain_device *dev)
752 * sas_discover_sata -- discover an STP/SATA domain device
753 * @dev: pointer to struct domain_device of interest
755 * First we notify the LLDD of this device, so we can send frames to
756 * it. Then depending on the type of device we call the appropriate
757 * discover functions. Once device discover is done, we notify the
758 * LLDD so that it can fine-tune its parameters for the device, by
759 * removing it and then adding it. That is, the second time around,
760 * the driver would have certain fields, that it is looking at, set.
761 * Finally we initialize the kobj so that the device can be added to
762 * the system at registration time. Devices directly attached to a HA
763 * port, have no parents. All other devices do, and should have their
764 * "parent" pointer set appropriately before calling this function.
766 int sas_discover_sata(struct domain_device *dev)
770 sas_get_ata_command_set(dev);
772 res = sas_notify_lldd_dev_found(dev);
776 switch (dev->dev_type) {
778 res = sas_discover_sata_dev(dev);
781 res = sas_discover_sata_pm(dev);
786 sas_notify_lldd_dev_gone(dev);
788 sas_notify_lldd_dev_found(dev);
789 res = sas_rphy_add(dev->rphy);
795 void sas_ata_strategy_handler(struct Scsi_Host *shost)
797 struct scsi_device *sdev;
799 shost_for_each_device(sdev, shost) {
800 struct domain_device *ddev = sdev_to_domain_dev(sdev);
801 struct ata_port *ap = ddev->sata_dev.ap;
803 if (!dev_is_sata(ddev))
806 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
807 ata_scsi_port_error_handler(shost, ap);
811 int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
812 enum blk_eh_timer_return *rtn)
814 struct domain_device *ddev = cmd_to_domain_dev(cmd);
816 if (!dev_is_sata(ddev) || task)
819 /* we're a sata device with no task, so this must be a libata
820 * eh timeout. Ideally should hook into libata timeout
821 * handling, but there's no point, it just wants to activate
823 *rtn = BLK_EH_NOT_HANDLED;
827 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
828 struct list_head *done_q)
831 struct scsi_cmnd *cmd, *n;
839 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
840 struct domain_device *ddev = cmd_to_domain_dev(cmd);
842 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
844 if (ap && ap != ddev->sata_dev.ap)
846 ap = ddev->sata_dev.ap;
848 list_move(&cmd->eh_entry, &sata_q);
851 if (!list_empty(&sata_q)) {
852 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
853 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
855 * ata's error handler may leave the cmd on the list
856 * so make sure they don't remain on a stack list
857 * about to go out of scope.
859 * This looks strange, since the commands are
860 * now part of no list, but the next error
861 * action will be ata_port_error_handler()
862 * which takes no list and sweeps them up
863 * anyway from the ata tag array.
865 while (!list_empty(&sata_q))
866 list_del_init(sata_q.next);