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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / scsi / libsas / sas_ata.c
blobdb9238f2ecb8b7596dda9c2d4132000af0910bd7
1 /*
2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
3 *
4 * Copyright (C) 2006 IBM Corporation
5 *
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
7 *
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.
12 *
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.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
21 * USA
22 */
23
24 #include <linux/scatterlist.h>
25 #include <linux/slab.h>
26
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>
38
39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
40 {
41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
42
43 /* transport error */
44 if (ts->resp == SAS_TASK_UNDELIVERED)
45 return AC_ERR_ATA_BUS;
46
47 /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
49 switch (ts->stat) {
50 case SAS_DEV_NO_RESPONSE:
51 return AC_ERR_TIMEOUT;
52
53 case SAS_INTERRUPTED:
54 case SAS_PHY_DOWN:
55 case SAS_NAK_R_ERR:
56 return AC_ERR_ATA_BUS;
57
58
59 case SAS_DATA_UNDERRUN:
60 /*
61 * Some programs that use the taskfile interface
62 * (smartctl in particular) can cause underrun
63 * problems. Ignore these errors, perhaps at our
64 * peril.
65 */
66 return 0;
67
68 case SAS_DATA_OVERRUN:
69 case SAS_QUEUE_FULL:
70 case SAS_DEVICE_UNKNOWN:
71 case SAS_SG_ERR:
72 return AC_ERR_INVALID;
73
74 case SAS_OPEN_TO:
75 case SAS_OPEN_REJECT:
76 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
77 __func__, ts->stat);
78 return AC_ERR_OTHER;
79
80 case SAM_STAT_CHECK_CONDITION:
81 case SAS_ABORTED_TASK:
82 return AC_ERR_DEV;
83
84 case SAS_PROTO_RESPONSE:
85 /* This means the ending_fis has the error
86 * value; return 0 here to collect it */
87 return 0;
88 default:
89 return 0;
90 }
91 }
92
93 static void sas_ata_task_done(struct sas_task *task)
94 {
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;
101 unsigned long flags;
102 struct ata_link *link;
103
104 if (!qc)
105 goto qc_already_gone;
106
107 dev = qc->ap->private_data;
108 sas_ha = dev->port->ha;
109 link = &dev->sata_dev.ap->link;
110
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);
116
117 if (!link->sactive) {
118 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
119 } else {
120 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;
123 }
124
125 dev->sata_dev.sstatus = resp->sstatus;
126 dev->sata_dev.serror = resp->serror;
127 dev->sata_dev.scontrol = resp->scontrol;
128 } else {
129 ac = sas_to_ata_err(stat);
130 if (ac) {
131 SAS_DPRINTK("%s: SAS error %x\n", __func__,
132 stat->stat);
133 /* We saw a SAS error. Send a vague error. */
134 if (!link->sactive) {
135 qc->err_mask = ac;
136 } else {
137 link->eh_info.err_mask |= AC_ERR_DEV;
138 qc->flags |= ATA_QCFLAG_FAILED;
139 }
140
141 dev->sata_dev.tf.feature = 0x04; /* status err */
142 dev->sata_dev.tf.command = ATA_ERR;
143 }
144 }
145
146 qc->lldd_task = NULL;
147 if (qc->scsicmd)
148 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
149 ata_qc_complete(qc);
150 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
151
152 /*
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.
160 */
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);
164 spin_unlock_irqrestore(&task->task_state_lock, flags);
165
166 qc_already_gone:
167 list_del_init(&task->list);
168 sas_free_task(task);
169 }
170
171 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
172 {
173 int res;
174 struct sas_task *task;
175 struct domain_device *dev = qc->ap->private_data;
176 struct sas_ha_struct *sas_ha = dev->port->ha;
177 struct Scsi_Host *host = sas_ha->core.shost;
178 struct sas_internal *i = to_sas_internal(host->transportt);
179 struct scatterlist *sg;
180 unsigned int xfer = 0;
181 unsigned int si;
182
183 /* If the device fell off, no sense in issuing commands */
184 if (dev->gone)
185 return AC_ERR_SYSTEM;
186
187 task = sas_alloc_task(GFP_ATOMIC);
188 if (!task)
189 return AC_ERR_SYSTEM;
190 task->dev = dev;
191 task->task_proto = SAS_PROTOCOL_STP;
192 task->task_done = sas_ata_task_done;
193
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 */
197 qc->tf.nsect = 0;
198 }
199
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;
206 } else {
207 for_each_sg(qc->sg, sg, qc->n_elem, si)
208 xfer += sg->length;
209
210 task->total_xfer_len = xfer;
211 task->num_scatter = si;
212 }
213
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;
219
220 switch (qc->tf.protocol) {
221 case ATA_PROT_NCQ:
222 task->ata_task.use_ncq = 1;
223 /* fall through */
224 case ATAPI_PROT_DMA:
225 case ATA_PROT_DMA:
226 task->ata_task.dma_xfer = 1;
227 break;
228 }
229
230 if (qc->scsicmd)
231 ASSIGN_SAS_TASK(qc->scsicmd, task);
232
233 if (sas_ha->lldd_max_execute_num < 2)
234 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
235 else
236 res = sas_queue_up(task);
237
238 /* Examine */
239 if (res) {
240 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
241
242 if (qc->scsicmd)
243 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
244 sas_free_task(task);
245 return AC_ERR_SYSTEM;
246 }
247
248 return 0;
249 }
250
251 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
252 {
253 struct domain_device *dev = qc->ap->private_data;
254
255 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
256 return true;
257 }
258
259 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
260 unsigned long deadline)
261 {
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;
267 int ret = 0;
268
269 if (i->dft->lldd_I_T_nexus_reset)
270 res = i->dft->lldd_I_T_nexus_reset(dev);
271
272 if (res != TMF_RESP_FUNC_COMPLETE) {
273 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
274 ret = -EAGAIN;
275 }
276
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;
281 break;
282 case ATAPI_COMMAND_SET:
283 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
284 *class = ATA_DEV_ATAPI;
285 break;
286 default:
287 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
288 __func__,
289 dev->sata_dev.command_set);
290 *class = ATA_DEV_UNKNOWN;
291 break;
292 }
293
294 ap->cbl = ATA_CBL_SATA;
295 return ret;
296 }
297
298 static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
299 unsigned long deadline)
300 {
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;
306 int ret = 0;
307
308 if (i->dft->lldd_ata_soft_reset)
309 res = i->dft->lldd_ata_soft_reset(dev);
310
311 if (res != TMF_RESP_FUNC_COMPLETE) {
312 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
313 ret = -EAGAIN;
314 }
315
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;
320 break;
321 case ATAPI_COMMAND_SET:
322 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
323 *class = ATA_DEV_ATAPI;
324 break;
325 default:
326 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
327 __func__, dev->sata_dev.command_set);
328 *class = ATA_DEV_UNKNOWN;
329 break;
330 }
331
332 ap->cbl = ATA_CBL_SATA;
333 return ret;
334 }
335
336 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
337 {
338 if (qc->flags & ATA_QCFLAG_FAILED)
339 qc->err_mask |= AC_ERR_OTHER;
340
341 if (qc->err_mask) {
342 /*
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.
347 */
348 struct sas_task *task = qc->lldd_task;
349 unsigned long flags;
350
351 qc->lldd_task = NULL;
352 if (task) {
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);
357
358 task->uldd_task = NULL;
359 __sas_task_abort(task);
360 }
361 }
362 }
363
364 static struct ata_port_operations sas_sata_ops = {
365 .prereset = ata_std_prereset,
366 .softreset = sas_ata_soft_reset,
367 .hardreset = sas_ata_hard_reset,
368 .postreset = ata_std_postreset,
369 .error_handler = ata_std_error_handler,
370 .post_internal_cmd = sas_ata_post_internal,
371 .qc_defer = ata_std_qc_defer,
372 .qc_prep = ata_noop_qc_prep,
373 .qc_issue = sas_ata_qc_issue,
374 .qc_fill_rtf = sas_ata_qc_fill_rtf,
375 .port_start = ata_sas_port_start,
376 .port_stop = ata_sas_port_stop,
377 };
378
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,
382 .mwdma_mask = ATA_MWDMA2,
383 .udma_mask = ATA_UDMA6,
384 .port_ops = &sas_sata_ops
385 };
386
387 int sas_ata_init_host_and_port(struct domain_device *found_dev,
388 struct scsi_target *starget)
389 {
390 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
391 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
392 struct ata_port *ap;
393
394 ata_host_init(&found_dev->sata_dev.ata_host,
395 ha->dev,
396 sata_port_info.flags,
397 &sas_sata_ops);
398 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
399 &sata_port_info,
400 shost);
401 if (!ap) {
402 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
403 return -ENODEV;
404 }
405
406 ap->private_data = found_dev;
407 ap->cbl = ATA_CBL_SATA;
408 ap->scsi_host = shost;
409 found_dev->sata_dev.ap = ap;
410
411 return 0;
412 }
413
414 void sas_ata_task_abort(struct sas_task *task)
415 {
416 struct ata_queued_cmd *qc = task->uldd_task;
417 struct completion *waiting;
418
419 /* Bounce SCSI-initiated commands to the SCSI EH */
420 if (qc->scsicmd) {
421 struct request_queue *q = qc->scsicmd->device->request_queue;
422 unsigned long flags;
423
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);
428 return;
429 }
430
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;
436 complete(waiting);
437 }
438
439 static void sas_task_timedout(unsigned long _task)
440 {
441 struct sas_task *task = (void *) _task;
442 unsigned long flags;
443
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);
448
449 complete(&task->completion);
450 }
451
452 static void sas_disc_task_done(struct sas_task *task)
453 {
454 if (!del_timer(&task->timer))
455 return;
456 complete(&task->completion);
457 }
458
459 #define SAS_DEV_TIMEOUT 10
460
461 /**
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
467 */
468 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
469 enum dma_data_direction dma_dir)
470 {
471 int res = 0;
472 struct scatterlist *scatter = NULL;
473 struct task_status_struct *ts = &task->task_status;
474 int num_scatter = 0;
475 int retries = 0;
476 struct sas_internal *i =
477 to_sas_internal(task->dev->port->ha->core.shost->transportt);
478
479 if (dma_dir != DMA_NONE) {
480 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
481 if (!scatter)
482 goto out;
483
484 sg_init_one(scatter, buffer, size);
485 num_scatter = 1;
486 }
487
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,
497 task->scatter,
498 task->num_scatter,
499 task->data_dir);
500 }
501
502 for (retries = 0; retries < 5; retries++) {
503 task->task_state_flags = SAS_TASK_STATE_PENDING;
504 init_completion(&task->completion);
505
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);
510
511 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
512 if (res) {
513 del_timer(&task->timer);
514 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
515 res);
516 goto ex_err;
517 }
518 wait_for_completion(&task->completion);
519 res = -ECOMM;
520 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
521 int res2;
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 */
529 else
530 goto ex_err;
531 }
532 }
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;
540
541 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
542 &shdr)) {
543 SAS_DPRINTK("couldn't normalize sense\n");
544 continue;
545 }
546 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
547 (shdr.sense_key == 2 && shdr.asc == 4 &&
548 shdr.ascq == 1)) {
549 SAS_DPRINTK("device %016llx LUN: %016llx "
550 "powering up or not ready yet, "
551 "sleeping...\n",
552 SAS_ADDR(task->dev->sas_addr),
553 SAS_ADDR(task->ssp_task.LUN));
554
555 schedule_timeout_interruptible(5*HZ);
556 } else if (shdr.sense_key == 1) {
557 res = 0;
558 break;
559 } else if (shdr.sense_key == 5) {
560 break;
561 } else {
562 SAS_DPRINTK("dev %016llx LUN: %016llx "
563 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
564 "\n",
565 SAS_ADDR(task->dev->sas_addr),
566 SAS_ADDR(task->ssp_task.LUN),
567 shdr.sense_key,
568 shdr.asc, shdr.ascq);
569 }
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, "
573 "stat:0x%x\n",
574 task->task_status.resp,
575 task->task_status.stat);
576 goto ex_err;
577 } else {
578 res = 0;
579 break;
580 }
581 }
582 ex_err:
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,
587 task->data_dir);
588 kfree(scatter);
589 }
590 out:
591 return res;
592 }
593
594 /* ---------- SATA ---------- */
595
596 static void sas_get_ata_command_set(struct domain_device *dev)
597 {
598 struct dev_to_host_fis *fis =
599 (struct dev_to_host_fis *) dev->frame_rcvd;
600
601 if ((fis->sector_count == 1 && /* ATA */
602 fis->lbal == 1 &&
603 fis->lbam == 0 &&
604 fis->lbah == 0 &&
605 fis->device == 0)
606 ||
607 (fis->sector_count == 0 && /* CE-ATA (mATA) */
608 fis->lbal == 0 &&
609 fis->lbam == 0xCE &&
610 fis->lbah == 0xAA &&
611 (fis->device & ~0x10) == 0))
612
613 dev->sata_dev.command_set = ATA_COMMAND_SET;
614
615 else if ((fis->interrupt_reason == 1 && /* ATAPI */
616 fis->lbal == 1 &&
617 fis->byte_count_low == 0x14 &&
618 fis->byte_count_high == 0xEB &&
619 (fis->device & ~0x10) == 0))
620
621 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
622
623 else if ((fis->sector_count == 1 && /* SEMB */
624 fis->lbal == 1 &&
625 fis->lbam == 0x3C &&
626 fis->lbah == 0xC3 &&
627 fis->device == 0)
628 ||
629 (fis->interrupt_reason == 1 && /* SATA PM */
630 fis->lbal == 1 &&
631 fis->byte_count_low == 0x69 &&
632 fis->byte_count_high == 0x96 &&
633 (fis->device & ~0x10) == 0))
634
635 /* Treat it as a superset? */
636 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
637 }
638
639 /**
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
647 */
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)
651 {
652 int res = 0;
653 struct sas_task *task;
654 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
655 &dev->frame_rcvd[0];
656
657 res = -ENOMEM;
658 task = sas_alloc_task(GFP_KERNEL);
659 if (!task)
660 goto out;
661
662 task->dev = dev;
663
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;
669
670 res = sas_execute_task(task, buffer, size, dma_dir);
671
672 sas_free_task(task);
673 out:
674 return res;
675 }
676
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
681
682 /**
683 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
684 * @dev: STP/SATA device of interest (ATA/ATAPI)
685 *
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.
690 */
691 static int sas_discover_sata_dev(struct domain_device *dev)
692 {
693 int res;
694 __le16 *identify_x;
695 u8 command;
696
697 identify_x = kzalloc(512, GFP_KERNEL);
698 if (!identify_x)
699 return -ENOMEM;
700
701 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
702 dev->sata_dev.identify_device = identify_x;
703 command = ATA_IDENTIFY_DEV;
704 } else {
705 dev->sata_dev.identify_packet_device = identify_x;
706 command = ATA_IDENTIFY_PACKET_DEV;
707 }
708
709 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
710 DMA_FROM_DEVICE);
711 if (res)
712 goto out_err;
713
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)))
720 goto cont1;
721 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
722 ATA_FEATURE_PUP_STBY_SPIN_UP,
723 NULL, 0, DMA_NONE);
724 if (res)
725 goto cont1;
726
727 schedule_timeout_interruptible(5*HZ); /* More time? */
728 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
729 DMA_FROM_DEVICE);
730 if (res)
731 goto out_err;
732 }
733 cont1:
734 /* XXX Hint: register this SATA device with SATL.
735 When this returns, dev->sata_dev->lu is alive and
736 present.
737 sas_satl_register_dev(dev);
738 */
739
740 sas_fill_in_rphy(dev, dev->rphy);
741
742 return 0;
743 out_err:
744 dev->sata_dev.identify_packet_device = NULL;
745 dev->sata_dev.identify_device = NULL;
746 kfree(identify_x);
747 return res;
748 }
749
750 static int sas_discover_sata_pm(struct domain_device *dev)
751 {
752 return -ENODEV;
753 }
754
755 /**
756 * sas_discover_sata -- discover an STP/SATA domain device
757 * @dev: pointer to struct domain_device of interest
758 *
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.
769 */
770 int sas_discover_sata(struct domain_device *dev)
771 {
772 int res;
773
774 sas_get_ata_command_set(dev);
775
776 res = sas_notify_lldd_dev_found(dev);
777 if (res)
778 return res;
779
780 switch (dev->dev_type) {
781 case SATA_DEV:
782 res = sas_discover_sata_dev(dev);
783 break;
784 case SATA_PM:
785 res = sas_discover_sata_pm(dev);
786 break;
787 default:
788 break;
789 }
790 sas_notify_lldd_dev_gone(dev);
791 if (!res) {
792 sas_notify_lldd_dev_found(dev);
793 res = sas_rphy_add(dev->rphy);
794 }
795
796 return res;
797 }
798
799 void sas_ata_strategy_handler(struct Scsi_Host *shost)
800 {
801 struct scsi_device *sdev;
802
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;
806
807 if (!dev_is_sata(ddev))
808 continue;
809
810 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
811 ata_scsi_port_error_handler(shost, ap);
812 }
813 }
814
815 int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
816 enum blk_eh_timer_return *rtn)
817 {
818 struct domain_device *ddev = cmd_to_domain_dev(cmd);
819
820 if (!dev_is_sata(ddev) || task)
821 return 0;
822
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
826 * the eh thread */
827 *rtn = BLK_EH_NOT_HANDLED;
828 return 1;
829 }
830
831 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
832 struct list_head *done_q)
833 {
834 int rtn = 0;
835 struct scsi_cmnd *cmd, *n;
836 struct ata_port *ap;
837
838 do {
839 LIST_HEAD(sata_q);
840
841 ap = NULL;
842
843 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
844 struct domain_device *ddev = cmd_to_domain_dev(cmd);
845
846 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
847 continue;
848 if (ap && ap != ddev->sata_dev.ap)
849 continue;
850 ap = ddev->sata_dev.ap;
851 rtn = 1;
852 list_move(&cmd->eh_entry, &sata_q);
853 }
854
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);
858 /*
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.
862 *
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.
868 */
869 while (!list_empty(&sata_q))
870 list_del_init(sata_q.next);
871 }
872 } while (ap);
873
874 return rtn;
875 }