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;
74 case SAM_STAT_CHECK_CONDITION:
77 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
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;
104 goto qc_already_gone;
106 dev = qc->ap->private_data;
107 sas_ha = dev->port->ha;
109 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
110 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD) {
111 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
112 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
113 dev->sata_dev.sstatus = resp->sstatus;
114 dev->sata_dev.serror = resp->serror;
115 dev->sata_dev.scontrol = resp->scontrol;
116 } else if (stat->stat != SAM_STAT_GOOD) {
117 ac = sas_to_ata_err(stat);
119 SAS_DPRINTK("%s: SAS error %x\n", __func__,
121 /* We saw a SAS error. Send a vague error. */
123 dev->sata_dev.tf.feature = 0x04; /* status err */
124 dev->sata_dev.tf.command = ATA_ERR;
128 qc->lldd_task = NULL;
130 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
132 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
135 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
136 * flag is set, then we must have come in via the libsas EH
137 * functions. When we exit this function, we need to put the
138 * scsi_cmnd on the list of finished errors. The ata_qc_complete
139 * call cleans up the libata side of things but we're protected
140 * from the scsi_cmnd going away because the scsi_cmnd is owned
141 * by the EH, making libata's call to scsi_done a NOP.
143 spin_lock_irqsave(&task->task_state_lock, flags);
144 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
145 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
146 spin_unlock_irqrestore(&task->task_state_lock, flags);
149 list_del_init(&task->list);
153 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156 struct sas_task *task;
157 struct domain_device *dev = qc->ap->private_data;
158 struct sas_ha_struct *sas_ha = dev->port->ha;
159 struct Scsi_Host *host = sas_ha->core.shost;
160 struct sas_internal *i = to_sas_internal(host->transportt);
161 struct scatterlist *sg;
162 unsigned int xfer = 0;
165 /* If the device fell off, no sense in issuing commands */
167 return AC_ERR_SYSTEM;
169 task = sas_alloc_task(GFP_ATOMIC);
171 return AC_ERR_SYSTEM;
173 task->task_proto = SAS_PROTOCOL_STP;
174 task->task_done = sas_ata_task_done;
176 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
177 qc->tf.command == ATA_CMD_FPDMA_READ) {
178 /* Need to zero out the tag libata assigned us */
182 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
183 task->uldd_task = qc;
184 if (ata_is_atapi(qc->tf.protocol)) {
185 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
186 task->total_xfer_len = qc->nbytes;
187 task->num_scatter = qc->n_elem;
189 for_each_sg(qc->sg, sg, qc->n_elem, si)
192 task->total_xfer_len = xfer;
193 task->num_scatter = si;
196 task->data_dir = qc->dma_dir;
197 task->scatter = qc->sg;
198 task->ata_task.retry_count = 1;
199 task->task_state_flags = SAS_TASK_STATE_PENDING;
200 qc->lldd_task = task;
202 switch (qc->tf.protocol) {
204 task->ata_task.use_ncq = 1;
208 task->ata_task.dma_xfer = 1;
213 ASSIGN_SAS_TASK(qc->scsicmd, task);
215 if (sas_ha->lldd_max_execute_num < 2)
216 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
218 res = sas_queue_up(task);
222 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
225 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
227 return AC_ERR_SYSTEM;
233 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
235 struct domain_device *dev = qc->ap->private_data;
237 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
241 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
242 unsigned long deadline)
244 struct ata_port *ap = link->ap;
245 struct domain_device *dev = ap->private_data;
246 struct sas_internal *i =
247 to_sas_internal(dev->port->ha->core.shost->transportt);
248 int res = TMF_RESP_FUNC_FAILED;
251 if (i->dft->lldd_I_T_nexus_reset)
252 res = i->dft->lldd_I_T_nexus_reset(dev);
254 if (res != TMF_RESP_FUNC_COMPLETE) {
255 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
259 switch (dev->sata_dev.command_set) {
260 case ATA_COMMAND_SET:
261 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
262 *class = ATA_DEV_ATA;
264 case ATAPI_COMMAND_SET:
265 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
266 *class = ATA_DEV_ATAPI;
269 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
271 dev->sata_dev.command_set);
272 *class = ATA_DEV_UNKNOWN;
276 ap->cbl = ATA_CBL_SATA;
280 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
282 if (qc->flags & ATA_QCFLAG_FAILED)
283 qc->err_mask |= AC_ERR_OTHER;
287 * Find the sas_task and kill it. By this point,
288 * libata has decided to kill the qc, so we needn't
289 * bother with sas_ata_task_done. But we still
290 * ought to abort the task.
292 struct sas_task *task = qc->lldd_task;
295 qc->lldd_task = NULL;
297 /* Should this be a AT(API) device reset? */
298 spin_lock_irqsave(&task->task_state_lock, flags);
299 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
300 spin_unlock_irqrestore(&task->task_state_lock, flags);
302 task->uldd_task = NULL;
303 __sas_task_abort(task);
308 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
311 struct domain_device *dev = link->ap->private_data;
313 SAS_DPRINTK("STUB %s\n", __func__);
316 dev->sata_dev.sstatus = val;
319 dev->sata_dev.scontrol = val;
322 dev->sata_dev.serror = val;
325 dev->sata_dev.ap->link.sactive = val;
333 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
336 struct domain_device *dev = link->ap->private_data;
338 SAS_DPRINTK("STUB %s\n", __func__);
341 *val = dev->sata_dev.sstatus;
344 *val = dev->sata_dev.scontrol;
347 *val = dev->sata_dev.serror;
350 *val = dev->sata_dev.ap->link.sactive;
357 static struct ata_port_operations sas_sata_ops = {
358 .prereset = ata_std_prereset,
360 .hardreset = sas_ata_hard_reset,
361 .postreset = ata_std_postreset,
362 .error_handler = ata_std_error_handler,
363 .post_internal_cmd = sas_ata_post_internal,
364 .qc_defer = ata_std_qc_defer,
365 .qc_prep = ata_noop_qc_prep,
366 .qc_issue = sas_ata_qc_issue,
367 .qc_fill_rtf = sas_ata_qc_fill_rtf,
368 .port_start = ata_sas_port_start,
369 .port_stop = ata_sas_port_stop,
370 .scr_read = sas_ata_scr_read,
371 .scr_write = sas_ata_scr_write
374 static struct ata_port_info sata_port_info = {
375 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
376 .pio_mask = ATA_PIO4,
377 .mwdma_mask = ATA_MWDMA2,
378 .udma_mask = ATA_UDMA6,
379 .port_ops = &sas_sata_ops
382 int sas_ata_init_host_and_port(struct domain_device *found_dev,
383 struct scsi_target *starget)
385 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
386 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
389 ata_host_init(&found_dev->sata_dev.ata_host,
391 sata_port_info.flags,
393 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
397 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
401 ap->private_data = found_dev;
402 ap->cbl = ATA_CBL_SATA;
403 ap->scsi_host = shost;
404 found_dev->sata_dev.ap = ap;
409 void sas_ata_task_abort(struct sas_task *task)
411 struct ata_queued_cmd *qc = task->uldd_task;
412 struct completion *waiting;
414 /* Bounce SCSI-initiated commands to the SCSI EH */
416 struct request_queue *q = qc->scsicmd->device->request_queue;
419 spin_lock_irqsave(q->queue_lock, flags);
420 blk_abort_request(qc->scsicmd->request);
421 spin_unlock_irqrestore(q->queue_lock, flags);
422 scsi_schedule_eh(qc->scsicmd->device->host);
426 /* Internal command, fake a timeout and complete. */
427 qc->flags &= ~ATA_QCFLAG_ACTIVE;
428 qc->flags |= ATA_QCFLAG_FAILED;
429 qc->err_mask |= AC_ERR_TIMEOUT;
430 waiting = qc->private_data;
434 static void sas_task_timedout(unsigned long _task)
436 struct sas_task *task = (void *) _task;
439 spin_lock_irqsave(&task->task_state_lock, flags);
440 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
441 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
442 spin_unlock_irqrestore(&task->task_state_lock, flags);
444 complete(&task->completion);
447 static void sas_disc_task_done(struct sas_task *task)
449 if (!del_timer(&task->timer))
451 complete(&task->completion);
454 #define SAS_DEV_TIMEOUT 10
457 * sas_execute_task -- Basic task processing for discovery
458 * @task: the task to be executed
459 * @buffer: pointer to buffer to do I/O
460 * @size: size of @buffer
461 * @dma_dir: DMA direction. DMA_xxx
463 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
464 enum dma_data_direction dma_dir)
467 struct scatterlist *scatter = NULL;
468 struct task_status_struct *ts = &task->task_status;
471 struct sas_internal *i =
472 to_sas_internal(task->dev->port->ha->core.shost->transportt);
474 if (dma_dir != DMA_NONE) {
475 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
479 sg_init_one(scatter, buffer, size);
483 task->task_proto = task->dev->tproto;
484 task->scatter = scatter;
485 task->num_scatter = num_scatter;
486 task->total_xfer_len = size;
487 task->data_dir = dma_dir;
488 task->task_done = sas_disc_task_done;
489 if (dma_dir != DMA_NONE &&
490 sas_protocol_ata(task->task_proto)) {
491 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
497 for (retries = 0; retries < 5; retries++) {
498 task->task_state_flags = SAS_TASK_STATE_PENDING;
499 init_completion(&task->completion);
501 task->timer.data = (unsigned long) task;
502 task->timer.function = sas_task_timedout;
503 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
504 add_timer(&task->timer);
506 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
508 del_timer(&task->timer);
509 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
513 wait_for_completion(&task->completion);
515 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
517 SAS_DPRINTK("task aborted, flags:0x%x\n",
518 task->task_state_flags);
519 res2 = i->dft->lldd_abort_task(task);
520 SAS_DPRINTK("came back from abort task\n");
521 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
522 if (res2 == TMF_RESP_FUNC_COMPLETE)
523 continue; /* Retry the task */
528 if (task->task_status.stat == SAM_STAT_BUSY ||
529 task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
530 task->task_status.stat == SAS_QUEUE_FULL) {
531 SAS_DPRINTK("task: q busy, sleeping...\n");
532 schedule_timeout_interruptible(HZ);
533 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
534 struct scsi_sense_hdr shdr;
536 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
538 SAS_DPRINTK("couldn't normalize sense\n");
541 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
542 (shdr.sense_key == 2 && shdr.asc == 4 &&
544 SAS_DPRINTK("device %016llx LUN: %016llx "
545 "powering up or not ready yet, "
547 SAS_ADDR(task->dev->sas_addr),
548 SAS_ADDR(task->ssp_task.LUN));
550 schedule_timeout_interruptible(5*HZ);
551 } else if (shdr.sense_key == 1) {
554 } else if (shdr.sense_key == 5) {
557 SAS_DPRINTK("dev %016llx LUN: %016llx "
558 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
560 SAS_ADDR(task->dev->sas_addr),
561 SAS_ADDR(task->ssp_task.LUN),
563 shdr.asc, shdr.ascq);
565 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
566 task->task_status.stat != SAM_STAT_GOOD) {
567 SAS_DPRINTK("task finished with resp:0x%x, "
569 task->task_status.resp,
570 task->task_status.stat);
578 if (dma_dir != DMA_NONE) {
579 if (sas_protocol_ata(task->task_proto))
580 dma_unmap_sg(task->dev->port->ha->dev,
581 task->scatter, task->num_scatter,
589 /* ---------- SATA ---------- */
591 static void sas_get_ata_command_set(struct domain_device *dev)
593 struct dev_to_host_fis *fis =
594 (struct dev_to_host_fis *) dev->frame_rcvd;
596 if ((fis->sector_count == 1 && /* ATA */
602 (fis->sector_count == 0 && /* CE-ATA (mATA) */
606 (fis->device & ~0x10) == 0))
608 dev->sata_dev.command_set = ATA_COMMAND_SET;
610 else if ((fis->interrupt_reason == 1 && /* ATAPI */
612 fis->byte_count_low == 0x14 &&
613 fis->byte_count_high == 0xEB &&
614 (fis->device & ~0x10) == 0))
616 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
618 else if ((fis->sector_count == 1 && /* SEMB */
624 (fis->interrupt_reason == 1 && /* SATA PM */
626 fis->byte_count_low == 0x69 &&
627 fis->byte_count_high == 0x96 &&
628 (fis->device & ~0x10) == 0))
630 /* Treat it as a superset? */
631 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
635 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
636 * @dev: the device to send the command to
637 * @command: the command register
638 * @features: the features register
639 * @buffer: pointer to buffer to do I/O
640 * @size: size of @buffer
641 * @dma_dir: DMA direction. DMA_xxx
643 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
644 u8 features, void *buffer, int size,
645 enum dma_data_direction dma_dir)
648 struct sas_task *task;
649 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
653 task = sas_alloc_task(GFP_KERNEL);
659 task->ata_task.fis.fis_type = 0x27;
660 task->ata_task.fis.command = command;
661 task->ata_task.fis.features = features;
662 task->ata_task.fis.device = d2h_fis->device;
663 task->ata_task.retry_count = 1;
665 res = sas_execute_task(task, buffer, size, dma_dir);
672 #define ATA_IDENTIFY_DEV 0xEC
673 #define ATA_IDENTIFY_PACKET_DEV 0xA1
674 #define ATA_SET_FEATURES 0xEF
675 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
678 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
679 * @dev: STP/SATA device of interest (ATA/ATAPI)
681 * The LLDD has already been notified of this device, so that we can
682 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
683 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
684 * performance for this device.
686 static int sas_discover_sata_dev(struct domain_device *dev)
692 identify_x = kzalloc(512, GFP_KERNEL);
696 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
697 dev->sata_dev.identify_device = identify_x;
698 command = ATA_IDENTIFY_DEV;
700 dev->sata_dev.identify_packet_device = identify_x;
701 command = ATA_IDENTIFY_PACKET_DEV;
704 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
709 /* lives on the media? */
710 if (le16_to_cpu(identify_x[0]) & 4) {
711 /* incomplete response */
712 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
713 "dev %llx\n", SAS_ADDR(dev->sas_addr));
714 if (!(identify_x[83] & cpu_to_le16(1<<6)))
716 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
717 ATA_FEATURE_PUP_STBY_SPIN_UP,
722 schedule_timeout_interruptible(5*HZ); /* More time? */
723 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
729 /* XXX Hint: register this SATA device with SATL.
730 When this returns, dev->sata_dev->lu is alive and
732 sas_satl_register_dev(dev);
735 sas_fill_in_rphy(dev, dev->rphy);
739 dev->sata_dev.identify_packet_device = NULL;
740 dev->sata_dev.identify_device = NULL;
745 static int sas_discover_sata_pm(struct domain_device *dev)
751 * sas_discover_sata -- discover an STP/SATA domain device
752 * @dev: pointer to struct domain_device of interest
754 * First we notify the LLDD of this device, so we can send frames to
755 * it. Then depending on the type of device we call the appropriate
756 * discover functions. Once device discover is done, we notify the
757 * LLDD so that it can fine-tune its parameters for the device, by
758 * removing it and then adding it. That is, the second time around,
759 * the driver would have certain fields, that it is looking at, set.
760 * Finally we initialize the kobj so that the device can be added to
761 * the system at registration time. Devices directly attached to a HA
762 * port, have no parents. All other devices do, and should have their
763 * "parent" pointer set appropriately before calling this function.
765 int sas_discover_sata(struct domain_device *dev)
769 sas_get_ata_command_set(dev);
771 res = sas_notify_lldd_dev_found(dev);
775 switch (dev->dev_type) {
777 res = sas_discover_sata_dev(dev);
780 res = sas_discover_sata_pm(dev);
785 sas_notify_lldd_dev_gone(dev);
787 sas_notify_lldd_dev_found(dev);
788 res = sas_rphy_add(dev->rphy);
794 void sas_ata_strategy_handler(struct Scsi_Host *shost)
796 struct scsi_device *sdev;
798 shost_for_each_device(sdev, shost) {
799 struct domain_device *ddev = sdev_to_domain_dev(sdev);
800 struct ata_port *ap = ddev->sata_dev.ap;
802 if (!dev_is_sata(ddev))
805 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
806 ata_scsi_port_error_handler(shost, ap);
810 int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
811 enum blk_eh_timer_return *rtn)
813 struct domain_device *ddev = cmd_to_domain_dev(cmd);
815 if (!dev_is_sata(ddev) || task)
818 /* we're a sata device with no task, so this must be a libata
819 * eh timeout. Ideally should hook into libata timeout
820 * handling, but there's no point, it just wants to activate
822 *rtn = BLK_EH_NOT_HANDLED;
826 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
827 struct list_head *done_q)
830 struct scsi_cmnd *cmd, *n;
838 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
839 struct domain_device *ddev = cmd_to_domain_dev(cmd);
841 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
843 if(ap && ap != ddev->sata_dev.ap)
845 ap = ddev->sata_dev.ap;
847 list_move(&cmd->eh_entry, &sata_q);
850 if (!list_empty(&sata_q)) {
851 ata_port_printk(ap, KERN_DEBUG,"sas eh calling libata cmd error handler\n");
852 ata_scsi_cmd_error_handler(shost, ap, &sata_q);