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
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* published by the Free Software Foundation; either version 2 of the
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* 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
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* 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
ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
117
if (!link->sactive) {
118
qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
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link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
121
if (unlikely(link->eh_info.err_mask))
122
qc->flags |= ATA_QCFLAG_FAILED;
125
dev->sata_dev.sstatus = resp->sstatus;
126
dev->sata_dev.serror = resp->serror;
127
dev->sata_dev.scontrol = resp->scontrol;
129
ac = sas_to_ata_err(stat);
131
SAS_DPRINTK("%s: SAS error %x\n", __func__,
133
/* We saw a SAS error. Send a vague error. */
134
if (!link->sactive) {
137
link->eh_info.err_mask |= AC_ERR_DEV;
138
qc->flags |= ATA_QCFLAG_FAILED;
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dev->sata_dev.tf.feature = 0x04; /* status err */
142
dev->sata_dev.tf.command = ATA_ERR;
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qc->lldd_task = NULL;
148
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
150
spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
153
* If the sas_task has an ata qc, a scsi_cmnd and the aborted
154
* flag is set, then we must have come in via the libsas EH
155
* functions. When we exit this function, we need to put the
156
* scsi_cmnd on the list of finished errors. The ata_qc_complete
157
* call cleans up the libata side of things but we're protected
158
* from the scsi_cmnd going away because the scsi_cmnd is owned
159
* by the EH, making libata's call to scsi_done a NOP.
161
spin_lock_irqsave(&task->task_state_lock, flags);
162
if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
163
scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
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spin_unlock_irqrestore(&task->task_state_lock, flags);
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list_del_init(&task->list);
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static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
174
struct sas_task *task;
175
struct domain_device *dev = qc->ap->private_data;
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struct sas_ha_struct *sas_ha = dev->port->ha;
177
struct Scsi_Host *host = sas_ha->core.shost;
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struct sas_internal *i = to_sas_internal(host->transportt);
179
struct scatterlist *sg;
180
unsigned int xfer = 0;
183
/* If the device fell off, no sense in issuing commands */
185
return AC_ERR_SYSTEM;
187
task = sas_alloc_task(GFP_ATOMIC);
189
return AC_ERR_SYSTEM;
191
task->task_proto = SAS_PROTOCOL_STP;
192
task->task_done = sas_ata_task_done;
194
if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
195
qc->tf.command == ATA_CMD_FPDMA_READ) {
196
/* Need to zero out the tag libata assigned us */
200
ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
201
task->uldd_task = qc;
202
if (ata_is_atapi(qc->tf.protocol)) {
203
memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
204
task->total_xfer_len = qc->nbytes;
205
task->num_scatter = qc->n_elem;
207
for_each_sg(qc->sg, sg, qc->n_elem, si)
210
task->total_xfer_len = xfer;
211
task->num_scatter = si;
214
task->data_dir = qc->dma_dir;
215
task->scatter = qc->sg;
216
task->ata_task.retry_count = 1;
217
task->task_state_flags = SAS_TASK_STATE_PENDING;
218
qc->lldd_task = task;
220
switch (qc->tf.protocol) {
222
task->ata_task.use_ncq = 1;
226
task->ata_task.dma_xfer = 1;
231
ASSIGN_SAS_TASK(qc->scsicmd, task);
233
if (sas_ha->lldd_max_execute_num < 2)
234
res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
236
res = sas_queue_up(task);
240
SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
243
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
245
return AC_ERR_SYSTEM;
251
static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
253
struct domain_device *dev = qc->ap->private_data;
255
memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
259
static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
260
unsigned long deadline)
262
struct ata_port *ap = link->ap;
263
struct domain_device *dev = ap->private_data;
264
struct sas_internal *i =
265
to_sas_internal(dev->port->ha->core.shost->transportt);
266
int res = TMF_RESP_FUNC_FAILED;
269
if (i->dft->lldd_I_T_nexus_reset)
270
res = i->dft->lldd_I_T_nexus_reset(dev);
272
if (res != TMF_RESP_FUNC_COMPLETE) {
273
SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
277
switch (dev->sata_dev.command_set) {
278
case ATA_COMMAND_SET:
279
SAS_DPRINTK("%s: Found ATA device.\n", __func__);
280
*class = ATA_DEV_ATA;
282
case ATAPI_COMMAND_SET:
283
SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
284
*class = ATA_DEV_ATAPI;
287
SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
289
dev->sata_dev.command_set);
290
*class = ATA_DEV_UNKNOWN;
294
ap->cbl = ATA_CBL_SATA;
298
static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
299
unsigned long deadline)
301
struct ata_port *ap = link->ap;
302
struct domain_device *dev = ap->private_data;
303
struct sas_internal *i =
304
to_sas_internal(dev->port->ha->core.shost->transportt);
305
int res = TMF_RESP_FUNC_FAILED;
308
if (i->dft->lldd_ata_soft_reset)
309
res = i->dft->lldd_ata_soft_reset(dev);
311
if (res != TMF_RESP_FUNC_COMPLETE) {
312
SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
316
switch (dev->sata_dev.command_set) {
317
case ATA_COMMAND_SET:
318
SAS_DPRINTK("%s: Found ATA device.\n", __func__);
319
*class = ATA_DEV_ATA;
321
case ATAPI_COMMAND_SET:
322
SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
323
*class = ATA_DEV_ATAPI;
326
SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
327
__func__, dev->sata_dev.command_set);
328
*class = ATA_DEV_UNKNOWN;
332
ap->cbl = ATA_CBL_SATA;
336
static void sas_ata_post_internal(struct ata_queued_cmd *qc)
338
if (qc->flags & ATA_QCFLAG_FAILED)
339
qc->err_mask |= AC_ERR_OTHER;
343
* Find the sas_task and kill it. By this point,
344
* libata has decided to kill the qc, so we needn't
345
* bother with sas_ata_task_done. But we still
346
* ought to abort the task.
348
struct sas_task *task = qc->lldd_task;
351
qc->lldd_task = NULL;
353
/* Should this be a AT(API) device reset? */
354
spin_lock_irqsave(&task->task_state_lock, flags);
355
task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
356
spin_unlock_irqrestore(&task->task_state_lock, flags);
358
task->uldd_task = NULL;
359
__sas_task_abort(task);
364
static struct ata_port_operations sas_sata_ops = {
365
.prereset = ata_std_prereset,
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.softreset = sas_ata_soft_reset,
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.hardreset = sas_ata_hard_reset,
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.postreset = ata_std_postreset,
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.error_handler = ata_std_error_handler,
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.post_internal_cmd = sas_ata_post_internal,
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.qc_defer = ata_std_qc_defer,
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.qc_prep = ata_noop_qc_prep,
373
.qc_issue = sas_ata_qc_issue,
374
.qc_fill_rtf = sas_ata_qc_fill_rtf,
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.port_start = ata_sas_port_start,
376
.port_stop = ata_sas_port_stop,
379
static struct ata_port_info sata_port_info = {
380
.flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
381
.pio_mask = ATA_PIO4,
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.mwdma_mask = ATA_MWDMA2,
383
.udma_mask = ATA_UDMA6,
384
.port_ops = &sas_sata_ops
387
int sas_ata_init_host_and_port(struct domain_device *found_dev,
388
struct scsi_target *starget)
390
struct Scsi_Host *shost = dev_to_shost(&starget->dev);
391
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
394
ata_host_init(&found_dev->sata_dev.ata_host,
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sata_port_info.flags,
398
ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
402
SAS_DPRINTK("ata_sas_port_alloc failed.\n");
406
ap->private_data = found_dev;
407
ap->cbl = ATA_CBL_SATA;
408
ap->scsi_host = shost;
409
found_dev->sata_dev.ap = ap;
414
void sas_ata_task_abort(struct sas_task *task)
416
struct ata_queued_cmd *qc = task->uldd_task;
417
struct completion *waiting;
419
/* Bounce SCSI-initiated commands to the SCSI EH */
421
struct request_queue *q = qc->scsicmd->device->request_queue;
424
spin_lock_irqsave(q->queue_lock, flags);
425
blk_abort_request(qc->scsicmd->request);
426
spin_unlock_irqrestore(q->queue_lock, flags);
427
scsi_schedule_eh(qc->scsicmd->device->host);
431
/* Internal command, fake a timeout and complete. */
432
qc->flags &= ~ATA_QCFLAG_ACTIVE;
433
qc->flags |= ATA_QCFLAG_FAILED;
434
qc->err_mask |= AC_ERR_TIMEOUT;
435
waiting = qc->private_data;
439
static void sas_task_timedout(unsigned long _task)
441
struct sas_task *task = (void *) _task;
444
spin_lock_irqsave(&task->task_state_lock, flags);
445
if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
446
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
447
spin_unlock_irqrestore(&task->task_state_lock, flags);
449
complete(&task->completion);
452
static void sas_disc_task_done(struct sas_task *task)
454
if (!del_timer(&task->timer))
456
complete(&task->completion);
459
#define SAS_DEV_TIMEOUT 10
462
* sas_execute_task -- Basic task processing for discovery
463
* @task: the task to be executed
464
* @buffer: pointer to buffer to do I/O
465
* @size: size of @buffer
466
* @dma_dir: DMA direction. DMA_xxx
468
static int sas_execute_task(struct sas_task *task, void *buffer, int size,
469
enum dma_data_direction dma_dir)
472
struct scatterlist *scatter = NULL;
473
struct task_status_struct *ts = &task->task_status;
476
struct sas_internal *i =
477
to_sas_internal(task->dev->port->ha->core.shost->transportt);
479
if (dma_dir != DMA_NONE) {
480
scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
484
sg_init_one(scatter, buffer, size);
488
task->task_proto = task->dev->tproto;
489
task->scatter = scatter;
490
task->num_scatter = num_scatter;
491
task->total_xfer_len = size;
492
task->data_dir = dma_dir;
493
task->task_done = sas_disc_task_done;
494
if (dma_dir != DMA_NONE &&
495
sas_protocol_ata(task->task_proto)) {
496
task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
502
for (retries = 0; retries < 5; retries++) {
503
task->task_state_flags = SAS_TASK_STATE_PENDING;
504
init_completion(&task->completion);
506
task->timer.data = (unsigned long) task;
507
task->timer.function = sas_task_timedout;
508
task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
509
add_timer(&task->timer);
511
res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
513
del_timer(&task->timer);
514
SAS_DPRINTK("executing SAS discovery task failed:%d\n",
518
wait_for_completion(&task->completion);
520
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
522
SAS_DPRINTK("task aborted, flags:0x%x\n",
523
task->task_state_flags);
524
res2 = i->dft->lldd_abort_task(task);
525
SAS_DPRINTK("came back from abort task\n");
526
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
527
if (res2 == TMF_RESP_FUNC_COMPLETE)
528
continue; /* Retry the task */
533
if (task->task_status.stat == SAM_STAT_BUSY ||
534
task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
535
task->task_status.stat == SAS_QUEUE_FULL) {
536
SAS_DPRINTK("task: q busy, sleeping...\n");
537
schedule_timeout_interruptible(HZ);
538
} else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
539
struct scsi_sense_hdr shdr;
541
if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
543
SAS_DPRINTK("couldn't normalize sense\n");
546
if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
547
(shdr.sense_key == 2 && shdr.asc == 4 &&
549
SAS_DPRINTK("device %016llx LUN: %016llx "
550
"powering up or not ready yet, "
552
SAS_ADDR(task->dev->sas_addr),
553
SAS_ADDR(task->ssp_task.LUN));
555
schedule_timeout_interruptible(5*HZ);
556
} else if (shdr.sense_key == 1) {
559
} else if (shdr.sense_key == 5) {
562
SAS_DPRINTK("dev %016llx LUN: %016llx "
563
"sense key:0x%x ASC:0x%x ASCQ:0x%x"
565
SAS_ADDR(task->dev->sas_addr),
566
SAS_ADDR(task->ssp_task.LUN),
568
shdr.asc, shdr.ascq);
570
} else if (task->task_status.resp != SAS_TASK_COMPLETE ||
571
task->task_status.stat != SAM_STAT_GOOD) {
572
SAS_DPRINTK("task finished with resp:0x%x, "
574
task->task_status.resp,
575
task->task_status.stat);
583
if (dma_dir != DMA_NONE) {
584
if (sas_protocol_ata(task->task_proto))
585
dma_unmap_sg(task->dev->port->ha->dev,
586
task->scatter, task->num_scatter,
594
/* ---------- SATA ---------- */
596
static void sas_get_ata_command_set(struct domain_device *dev)
598
struct dev_to_host_fis *fis =
599
(struct dev_to_host_fis *) dev->frame_rcvd;
601
if ((fis->sector_count == 1 && /* ATA */
607
(fis->sector_count == 0 && /* CE-ATA (mATA) */
611
(fis->device & ~0x10) == 0))
613
dev->sata_dev.command_set = ATA_COMMAND_SET;
615
else if ((fis->interrupt_reason == 1 && /* ATAPI */
617
fis->byte_count_low == 0x14 &&
618
fis->byte_count_high == 0xEB &&
619
(fis->device & ~0x10) == 0))
621
dev->sata_dev.command_set = ATAPI_COMMAND_SET;
623
else if ((fis->sector_count == 1 && /* SEMB */
629
(fis->interrupt_reason == 1 && /* SATA PM */
631
fis->byte_count_low == 0x69 &&
632
fis->byte_count_high == 0x96 &&
633
(fis->device & ~0x10) == 0))
635
/* Treat it as a superset? */
636
dev->sata_dev.command_set = ATAPI_COMMAND_SET;
640
* sas_issue_ata_cmd -- Basic SATA command processing for discovery
641
* @dev: the device to send the command to
642
* @command: the command register
643
* @features: the features register
644
* @buffer: pointer to buffer to do I/O
645
* @size: size of @buffer
646
* @dma_dir: DMA direction. DMA_xxx
648
static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
649
u8 features, void *buffer, int size,
650
enum dma_data_direction dma_dir)
653
struct sas_task *task;
654
struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
658
task = sas_alloc_task(GFP_KERNEL);
664
task->ata_task.fis.fis_type = 0x27;
665
task->ata_task.fis.command = command;
666
task->ata_task.fis.features = features;
667
task->ata_task.fis.device = d2h_fis->device;
668
task->ata_task.retry_count = 1;
670
res = sas_execute_task(task, buffer, size, dma_dir);
677
#define ATA_IDENTIFY_DEV 0xEC
678
#define ATA_IDENTIFY_PACKET_DEV 0xA1
679
#define ATA_SET_FEATURES 0xEF
680
#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
683
* sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
684
* @dev: STP/SATA device of interest (ATA/ATAPI)
686
* The LLDD has already been notified of this device, so that we can
687
* send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
688
* PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
689
* performance for this device.
691
static int sas_discover_sata_dev(struct domain_device *dev)
697
identify_x = kzalloc(512, GFP_KERNEL);
701
if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
702
dev->sata_dev.identify_device = identify_x;
703
command = ATA_IDENTIFY_DEV;
705
dev->sata_dev.identify_packet_device = identify_x;
706
command = ATA_IDENTIFY_PACKET_DEV;
709
res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
714
/* lives on the media? */
715
if (le16_to_cpu(identify_x[0]) & 4) {
716
/* incomplete response */
717
SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
718
"dev %llx\n", SAS_ADDR(dev->sas_addr));
719
if (!(identify_x[83] & cpu_to_le16(1<<6)))
721
res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
722
ATA_FEATURE_PUP_STBY_SPIN_UP,
727
schedule_timeout_interruptible(5*HZ); /* More time? */
728
res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
734
/* XXX Hint: register this SATA device with SATL.
735
When this returns, dev->sata_dev->lu is alive and
737
sas_satl_register_dev(dev);
740
sas_fill_in_rphy(dev, dev->rphy);
744
dev->sata_dev.identify_packet_device = NULL;
745
dev->sata_dev.identify_device = NULL;
750
static int sas_discover_sata_pm(struct domain_device *dev)
756
* sas_discover_sata -- discover an STP/SATA domain device
757
* @dev: pointer to struct domain_device of interest
759
* First we notify the LLDD of this device, so we can send frames to
760
* it. Then depending on the type of device we call the appropriate
761
* discover functions. Once device discover is done, we notify the
762
* LLDD so that it can fine-tune its parameters for the device, by
763
* removing it and then adding it. That is, the second time around,
764
* the driver would have certain fields, that it is looking at, set.
765
* Finally we initialize the kobj so that the device can be added to
766
* the system at registration time. Devices directly attached to a HA
767
* port, have no parents. All other devices do, and should have their
768
* "parent" pointer set appropriately before calling this function.
770
int sas_discover_sata(struct domain_device *dev)
774
sas_get_ata_command_set(dev);
776
res = sas_notify_lldd_dev_found(dev);
780
switch (dev->dev_type) {
782
res = sas_discover_sata_dev(dev);
785
res = sas_discover_sata_pm(dev);
790
sas_notify_lldd_dev_gone(dev);
792
sas_notify_lldd_dev_found(dev);
793
res = sas_rphy_add(dev->rphy);
799
void sas_ata_strategy_handler(struct Scsi_Host *shost)
801
struct scsi_device *sdev;
803
shost_for_each_device(sdev, shost) {
804
struct domain_device *ddev = sdev_to_domain_dev(sdev);
805
struct ata_port *ap = ddev->sata_dev.ap;
807
if (!dev_is_sata(ddev))
810
ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
811
ata_scsi_port_error_handler(shost, ap);
815
int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
816
enum blk_eh_timer_return *rtn)
818
struct domain_device *ddev = cmd_to_domain_dev(cmd);
820
if (!dev_is_sata(ddev) || task)
823
/* we're a sata device with no task, so this must be a libata
824
* eh timeout. Ideally should hook into libata timeout
825
* handling, but there's no point, it just wants to activate
827
*rtn = BLK_EH_NOT_HANDLED;
831
int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
832
struct list_head *done_q)
835
struct scsi_cmnd *cmd, *n;
843
list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
844
struct domain_device *ddev = cmd_to_domain_dev(cmd);
846
if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
848
if (ap && ap != ddev->sata_dev.ap)
850
ap = ddev->sata_dev.ap;
852
list_move(&cmd->eh_entry, &sata_q);
855
if (!list_empty(&sata_q)) {
856
ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
857
ata_scsi_cmd_error_handler(shost, ap, &sata_q);
859
* ata's error handler may leave the cmd on the list
860
* so make sure they don't remain on a stack list
861
* about to go out of scope.
863
* This looks strange, since the commands are
864
* now part of no list, but the next error
865
* action will be ata_port_error_handler()
866
* which takes no list and sweeps them up
867
* anyway from the ata tag array.
869
while (!list_empty(&sata_q))
870
list_del_init(sata_q.next);