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8c496b56556ce232cbbe2dc1832b8cafbf2d1fbc
[deliverable/linux.git] / drivers / scsi / libsas / sas_ata.c
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 SAM_CHECK_COND:
75 case SAS_OPEN_TO:
76 case SAS_OPEN_REJECT:
77 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
78 __func__, ts->stat);
79 return AC_ERR_OTHER;
80
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
103 if (!qc)
104 goto qc_already_gone;
105
106 dev = qc->ap->private_data;
107 sas_ha = dev->port->ha;
108
109 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
110 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_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);
118 if (ac) {
119 SAS_DPRINTK("%s: SAS error %x\n", __func__,
120 stat->stat);
121 /* We saw a SAS error. Send a vague error. */
122 qc->err_mask = ac;
123 dev->sata_dev.tf.feature = 0x04; /* status err */
124 dev->sata_dev.tf.command = ATA_ERR;
125 }
126 }
127
128 qc->lldd_task = NULL;
129 if (qc->scsicmd)
130 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
131 ata_qc_complete(qc);
132 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
133
134 /*
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.
142 */
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);
147
148 qc_already_gone:
149 list_del_init(&task->list);
150 sas_free_task(task);
151 }
152
153 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
154 {
155 int res;
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;
163 unsigned int si;
164
165 task = sas_alloc_task(GFP_ATOMIC);
166 if (!task)
167 return AC_ERR_SYSTEM;
168 task->dev = dev;
169 task->task_proto = SAS_PROTOCOL_STP;
170 task->task_done = sas_ata_task_done;
171
172 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
173 qc->tf.command == ATA_CMD_FPDMA_READ) {
174 /* Need to zero out the tag libata assigned us */
175 qc->tf.nsect = 0;
176 }
177
178 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
179 task->uldd_task = qc;
180 if (ata_is_atapi(qc->tf.protocol)) {
181 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
182 task->total_xfer_len = qc->nbytes;
183 task->num_scatter = qc->n_elem;
184 } else {
185 for_each_sg(qc->sg, sg, qc->n_elem, si)
186 xfer += sg->length;
187
188 task->total_xfer_len = xfer;
189 task->num_scatter = si;
190 }
191
192 task->data_dir = qc->dma_dir;
193 task->scatter = qc->sg;
194 task->ata_task.retry_count = 1;
195 task->task_state_flags = SAS_TASK_STATE_PENDING;
196 qc->lldd_task = task;
197
198 switch (qc->tf.protocol) {
199 case ATA_PROT_NCQ:
200 task->ata_task.use_ncq = 1;
201 /* fall through */
202 case ATAPI_PROT_DMA:
203 case ATA_PROT_DMA:
204 task->ata_task.dma_xfer = 1;
205 break;
206 }
207
208 if (qc->scsicmd)
209 ASSIGN_SAS_TASK(qc->scsicmd, task);
210
211 if (sas_ha->lldd_max_execute_num < 2)
212 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
213 else
214 res = sas_queue_up(task);
215
216 /* Examine */
217 if (res) {
218 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
219
220 if (qc->scsicmd)
221 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
222 sas_free_task(task);
223 return AC_ERR_SYSTEM;
224 }
225
226 return 0;
227 }
228
229 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
230 {
231 struct domain_device *dev = qc->ap->private_data;
232
233 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
234 return true;
235 }
236
237 static void sas_ata_phy_reset(struct ata_port *ap)
238 {
239 struct domain_device *dev = ap->private_data;
240 struct sas_internal *i =
241 to_sas_internal(dev->port->ha->core.shost->transportt);
242 int res = TMF_RESP_FUNC_FAILED;
243
244 if (i->dft->lldd_I_T_nexus_reset)
245 res = i->dft->lldd_I_T_nexus_reset(dev);
246
247 if (res != TMF_RESP_FUNC_COMPLETE)
248 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
249
250 switch (dev->sata_dev.command_set) {
251 case ATA_COMMAND_SET:
252 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
253 ap->link.device[0].class = ATA_DEV_ATA;
254 break;
255 case ATAPI_COMMAND_SET:
256 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
257 ap->link.device[0].class = ATA_DEV_ATAPI;
258 break;
259 default:
260 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
261 __func__,
262 dev->sata_dev.command_set);
263 ap->link.device[0].class = ATA_DEV_UNKNOWN;
264 break;
265 }
266
267 ap->cbl = ATA_CBL_SATA;
268 }
269
270 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
271 {
272 if (qc->flags & ATA_QCFLAG_FAILED)
273 qc->err_mask |= AC_ERR_OTHER;
274
275 if (qc->err_mask) {
276 /*
277 * Find the sas_task and kill it. By this point,
278 * libata has decided to kill the qc, so we needn't
279 * bother with sas_ata_task_done. But we still
280 * ought to abort the task.
281 */
282 struct sas_task *task = qc->lldd_task;
283 unsigned long flags;
284
285 qc->lldd_task = NULL;
286 if (task) {
287 /* Should this be a AT(API) device reset? */
288 spin_lock_irqsave(&task->task_state_lock, flags);
289 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
290 spin_unlock_irqrestore(&task->task_state_lock, flags);
291
292 task->uldd_task = NULL;
293 __sas_task_abort(task);
294 }
295 }
296 }
297
298 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
299 u32 val)
300 {
301 struct domain_device *dev = link->ap->private_data;
302
303 SAS_DPRINTK("STUB %s\n", __func__);
304 switch (sc_reg_in) {
305 case SCR_STATUS:
306 dev->sata_dev.sstatus = val;
307 break;
308 case SCR_CONTROL:
309 dev->sata_dev.scontrol = val;
310 break;
311 case SCR_ERROR:
312 dev->sata_dev.serror = val;
313 break;
314 case SCR_ACTIVE:
315 dev->sata_dev.ap->link.sactive = val;
316 break;
317 default:
318 return -EINVAL;
319 }
320 return 0;
321 }
322
323 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
324 u32 *val)
325 {
326 struct domain_device *dev = link->ap->private_data;
327
328 SAS_DPRINTK("STUB %s\n", __func__);
329 switch (sc_reg_in) {
330 case SCR_STATUS:
331 *val = dev->sata_dev.sstatus;
332 return 0;
333 case SCR_CONTROL:
334 *val = dev->sata_dev.scontrol;
335 return 0;
336 case SCR_ERROR:
337 *val = dev->sata_dev.serror;
338 return 0;
339 case SCR_ACTIVE:
340 *val = dev->sata_dev.ap->link.sactive;
341 return 0;
342 default:
343 return -EINVAL;
344 }
345 }
346
347 static struct ata_port_operations sas_sata_ops = {
348 .phy_reset = sas_ata_phy_reset,
349 .post_internal_cmd = sas_ata_post_internal,
350 .qc_prep = ata_noop_qc_prep,
351 .qc_issue = sas_ata_qc_issue,
352 .qc_fill_rtf = sas_ata_qc_fill_rtf,
353 .port_start = ata_sas_port_start,
354 .port_stop = ata_sas_port_stop,
355 .scr_read = sas_ata_scr_read,
356 .scr_write = sas_ata_scr_write
357 };
358
359 static struct ata_port_info sata_port_info = {
360 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
361 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
362 .pio_mask = 0x1f, /* PIO0-4 */
363 .mwdma_mask = 0x07, /* MWDMA0-2 */
364 .udma_mask = ATA_UDMA6,
365 .port_ops = &sas_sata_ops
366 };
367
368 int sas_ata_init_host_and_port(struct domain_device *found_dev,
369 struct scsi_target *starget)
370 {
371 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
372 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
373 struct ata_port *ap;
374
375 ata_host_init(&found_dev->sata_dev.ata_host,
376 ha->dev,
377 sata_port_info.flags,
378 &sas_sata_ops);
379 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
380 &sata_port_info,
381 shost);
382 if (!ap) {
383 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
384 return -ENODEV;
385 }
386
387 ap->private_data = found_dev;
388 ap->cbl = ATA_CBL_SATA;
389 ap->scsi_host = shost;
390 found_dev->sata_dev.ap = ap;
391
392 return 0;
393 }
394
395 void sas_ata_task_abort(struct sas_task *task)
396 {
397 struct ata_queued_cmd *qc = task->uldd_task;
398 struct completion *waiting;
399
400 /* Bounce SCSI-initiated commands to the SCSI EH */
401 if (qc->scsicmd) {
402 struct request_queue *q = qc->scsicmd->device->request_queue;
403 unsigned long flags;
404
405 spin_lock_irqsave(q->queue_lock, flags);
406 blk_abort_request(qc->scsicmd->request);
407 spin_unlock_irqrestore(q->queue_lock, flags);
408 scsi_schedule_eh(qc->scsicmd->device->host);
409 return;
410 }
411
412 /* Internal command, fake a timeout and complete. */
413 qc->flags &= ~ATA_QCFLAG_ACTIVE;
414 qc->flags |= ATA_QCFLAG_FAILED;
415 qc->err_mask |= AC_ERR_TIMEOUT;
416 waiting = qc->private_data;
417 complete(waiting);
418 }
419
420 static void sas_task_timedout(unsigned long _task)
421 {
422 struct sas_task *task = (void *) _task;
423 unsigned long flags;
424
425 spin_lock_irqsave(&task->task_state_lock, flags);
426 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
427 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
428 spin_unlock_irqrestore(&task->task_state_lock, flags);
429
430 complete(&task->completion);
431 }
432
433 static void sas_disc_task_done(struct sas_task *task)
434 {
435 if (!del_timer(&task->timer))
436 return;
437 complete(&task->completion);
438 }
439
440 #define SAS_DEV_TIMEOUT 10
441
442 /**
443 * sas_execute_task -- Basic task processing for discovery
444 * @task: the task to be executed
445 * @buffer: pointer to buffer to do I/O
446 * @size: size of @buffer
447 * @dma_dir: DMA direction. DMA_xxx
448 */
449 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
450 enum dma_data_direction dma_dir)
451 {
452 int res = 0;
453 struct scatterlist *scatter = NULL;
454 struct task_status_struct *ts = &task->task_status;
455 int num_scatter = 0;
456 int retries = 0;
457 struct sas_internal *i =
458 to_sas_internal(task->dev->port->ha->core.shost->transportt);
459
460 if (dma_dir != DMA_NONE) {
461 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
462 if (!scatter)
463 goto out;
464
465 sg_init_one(scatter, buffer, size);
466 num_scatter = 1;
467 }
468
469 task->task_proto = task->dev->tproto;
470 task->scatter = scatter;
471 task->num_scatter = num_scatter;
472 task->total_xfer_len = size;
473 task->data_dir = dma_dir;
474 task->task_done = sas_disc_task_done;
475 if (dma_dir != DMA_NONE &&
476 sas_protocol_ata(task->task_proto)) {
477 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
478 task->scatter,
479 task->num_scatter,
480 task->data_dir);
481 }
482
483 for (retries = 0; retries < 5; retries++) {
484 task->task_state_flags = SAS_TASK_STATE_PENDING;
485 init_completion(&task->completion);
486
487 task->timer.data = (unsigned long) task;
488 task->timer.function = sas_task_timedout;
489 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
490 add_timer(&task->timer);
491
492 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
493 if (res) {
494 del_timer(&task->timer);
495 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
496 res);
497 goto ex_err;
498 }
499 wait_for_completion(&task->completion);
500 res = -ECOMM;
501 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
502 int res2;
503 SAS_DPRINTK("task aborted, flags:0x%x\n",
504 task->task_state_flags);
505 res2 = i->dft->lldd_abort_task(task);
506 SAS_DPRINTK("came back from abort task\n");
507 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
508 if (res2 == TMF_RESP_FUNC_COMPLETE)
509 continue; /* Retry the task */
510 else
511 goto ex_err;
512 }
513 }
514 if (task->task_status.stat == SAM_BUSY ||
515 task->task_status.stat == SAM_TASK_SET_FULL ||
516 task->task_status.stat == SAS_QUEUE_FULL) {
517 SAS_DPRINTK("task: q busy, sleeping...\n");
518 schedule_timeout_interruptible(HZ);
519 } else if (task->task_status.stat == SAM_CHECK_COND) {
520 struct scsi_sense_hdr shdr;
521
522 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
523 &shdr)) {
524 SAS_DPRINTK("couldn't normalize sense\n");
525 continue;
526 }
527 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
528 (shdr.sense_key == 2 && shdr.asc == 4 &&
529 shdr.ascq == 1)) {
530 SAS_DPRINTK("device %016llx LUN: %016llx "
531 "powering up or not ready yet, "
532 "sleeping...\n",
533 SAS_ADDR(task->dev->sas_addr),
534 SAS_ADDR(task->ssp_task.LUN));
535
536 schedule_timeout_interruptible(5*HZ);
537 } else if (shdr.sense_key == 1) {
538 res = 0;
539 break;
540 } else if (shdr.sense_key == 5) {
541 break;
542 } else {
543 SAS_DPRINTK("dev %016llx LUN: %016llx "
544 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
545 "\n",
546 SAS_ADDR(task->dev->sas_addr),
547 SAS_ADDR(task->ssp_task.LUN),
548 shdr.sense_key,
549 shdr.asc, shdr.ascq);
550 }
551 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
552 task->task_status.stat != SAM_GOOD) {
553 SAS_DPRINTK("task finished with resp:0x%x, "
554 "stat:0x%x\n",
555 task->task_status.resp,
556 task->task_status.stat);
557 goto ex_err;
558 } else {
559 res = 0;
560 break;
561 }
562 }
563 ex_err:
564 if (dma_dir != DMA_NONE) {
565 if (sas_protocol_ata(task->task_proto))
566 dma_unmap_sg(task->dev->port->ha->dev,
567 task->scatter, task->num_scatter,
568 task->data_dir);
569 kfree(scatter);
570 }
571 out:
572 return res;
573 }
574
575 /* ---------- SATA ---------- */
576
577 static void sas_get_ata_command_set(struct domain_device *dev)
578 {
579 struct dev_to_host_fis *fis =
580 (struct dev_to_host_fis *) dev->frame_rcvd;
581
582 if ((fis->sector_count == 1 && /* ATA */
583 fis->lbal == 1 &&
584 fis->lbam == 0 &&
585 fis->lbah == 0 &&
586 fis->device == 0)
587 ||
588 (fis->sector_count == 0 && /* CE-ATA (mATA) */
589 fis->lbal == 0 &&
590 fis->lbam == 0xCE &&
591 fis->lbah == 0xAA &&
592 (fis->device & ~0x10) == 0))
593
594 dev->sata_dev.command_set = ATA_COMMAND_SET;
595
596 else if ((fis->interrupt_reason == 1 && /* ATAPI */
597 fis->lbal == 1 &&
598 fis->byte_count_low == 0x14 &&
599 fis->byte_count_high == 0xEB &&
600 (fis->device & ~0x10) == 0))
601
602 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
603
604 else if ((fis->sector_count == 1 && /* SEMB */
605 fis->lbal == 1 &&
606 fis->lbam == 0x3C &&
607 fis->lbah == 0xC3 &&
608 fis->device == 0)
609 ||
610 (fis->interrupt_reason == 1 && /* SATA PM */
611 fis->lbal == 1 &&
612 fis->byte_count_low == 0x69 &&
613 fis->byte_count_high == 0x96 &&
614 (fis->device & ~0x10) == 0))
615
616 /* Treat it as a superset? */
617 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
618 }
619
620 /**
621 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
622 * @dev: the device to send the command to
623 * @command: the command register
624 * @features: the features register
625 * @buffer: pointer to buffer to do I/O
626 * @size: size of @buffer
627 * @dma_dir: DMA direction. DMA_xxx
628 */
629 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
630 u8 features, void *buffer, int size,
631 enum dma_data_direction dma_dir)
632 {
633 int res = 0;
634 struct sas_task *task;
635 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
636 &dev->frame_rcvd[0];
637
638 res = -ENOMEM;
639 task = sas_alloc_task(GFP_KERNEL);
640 if (!task)
641 goto out;
642
643 task->dev = dev;
644
645 task->ata_task.fis.fis_type = 0x27;
646 task->ata_task.fis.command = command;
647 task->ata_task.fis.features = features;
648 task->ata_task.fis.device = d2h_fis->device;
649 task->ata_task.retry_count = 1;
650
651 res = sas_execute_task(task, buffer, size, dma_dir);
652
653 sas_free_task(task);
654 out:
655 return res;
656 }
657
658 #define ATA_IDENTIFY_DEV 0xEC
659 #define ATA_IDENTIFY_PACKET_DEV 0xA1
660 #define ATA_SET_FEATURES 0xEF
661 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
662
663 /**
664 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
665 * @dev: STP/SATA device of interest (ATA/ATAPI)
666 *
667 * The LLDD has already been notified of this device, so that we can
668 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
669 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
670 * performance for this device.
671 */
672 static int sas_discover_sata_dev(struct domain_device *dev)
673 {
674 int res;
675 __le16 *identify_x;
676 u8 command;
677
678 identify_x = kzalloc(512, GFP_KERNEL);
679 if (!identify_x)
680 return -ENOMEM;
681
682 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
683 dev->sata_dev.identify_device = identify_x;
684 command = ATA_IDENTIFY_DEV;
685 } else {
686 dev->sata_dev.identify_packet_device = identify_x;
687 command = ATA_IDENTIFY_PACKET_DEV;
688 }
689
690 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
691 DMA_FROM_DEVICE);
692 if (res)
693 goto out_err;
694
695 /* lives on the media? */
696 if (le16_to_cpu(identify_x[0]) & 4) {
697 /* incomplete response */
698 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
699 "dev %llx\n", SAS_ADDR(dev->sas_addr));
700 if (!(identify_x[83] & cpu_to_le16(1<<6)))
701 goto cont1;
702 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
703 ATA_FEATURE_PUP_STBY_SPIN_UP,
704 NULL, 0, DMA_NONE);
705 if (res)
706 goto cont1;
707
708 schedule_timeout_interruptible(5*HZ); /* More time? */
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 cont1:
715 /* XXX Hint: register this SATA device with SATL.
716 When this returns, dev->sata_dev->lu is alive and
717 present.
718 sas_satl_register_dev(dev);
719 */
720
721 sas_fill_in_rphy(dev, dev->rphy);
722
723 return 0;
724 out_err:
725 dev->sata_dev.identify_packet_device = NULL;
726 dev->sata_dev.identify_device = NULL;
727 kfree(identify_x);
728 return res;
729 }
730
731 static int sas_discover_sata_pm(struct domain_device *dev)
732 {
733 return -ENODEV;
734 }
735
736 /**
737 * sas_discover_sata -- discover an STP/SATA domain device
738 * @dev: pointer to struct domain_device of interest
739 *
740 * First we notify the LLDD of this device, so we can send frames to
741 * it. Then depending on the type of device we call the appropriate
742 * discover functions. Once device discover is done, we notify the
743 * LLDD so that it can fine-tune its parameters for the device, by
744 * removing it and then adding it. That is, the second time around,
745 * the driver would have certain fields, that it is looking at, set.
746 * Finally we initialize the kobj so that the device can be added to
747 * the system at registration time. Devices directly attached to a HA
748 * port, have no parents. All other devices do, and should have their
749 * "parent" pointer set appropriately before calling this function.
750 */
751 int sas_discover_sata(struct domain_device *dev)
752 {
753 int res;
754
755 sas_get_ata_command_set(dev);
756
757 res = sas_notify_lldd_dev_found(dev);
758 if (res)
759 return res;
760
761 switch (dev->dev_type) {
762 case SATA_DEV:
763 res = sas_discover_sata_dev(dev);
764 break;
765 case SATA_PM:
766 res = sas_discover_sata_pm(dev);
767 break;
768 default:
769 break;
770 }
771 sas_notify_lldd_dev_gone(dev);
772 if (!res) {
773 sas_notify_lldd_dev_found(dev);
774 res = sas_rphy_add(dev->rphy);
775 }
776
777 return res;
778 }
Linux kernel - Deliverables
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