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OMAP3: PM: Prevented DVFS state switches when enabling off-mode
[linux-ginger.git] / drivers / scsi / libsas / sas_ata.c
blobe15501170698a19957d22f92c6fbc2e3e89ac0c6
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
26 #include <scsi/sas_ata.h>
27 #include "sas_internal.h"
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_sas.h>
34 #include "../scsi_sas_internal.h"
35 #include "../scsi_transport_api.h"
36 #include <scsi/scsi_eh.h>
37
38 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
39 {
40 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
41
42 /* transport error */
43 if (ts->resp == SAS_TASK_UNDELIVERED)
44 return AC_ERR_ATA_BUS;
45
46 /* ts->resp == SAS_TASK_COMPLETE */
47 /* task delivered, what happened afterwards? */
48 switch (ts->stat) {
49 case SAS_DEV_NO_RESPONSE:
50 return AC_ERR_TIMEOUT;
51
52 case SAS_INTERRUPTED:
53 case SAS_PHY_DOWN:
54 case SAS_NAK_R_ERR:
55 return AC_ERR_ATA_BUS;
56
57
58 case SAS_DATA_UNDERRUN:
59 /*
60 * Some programs that use the taskfile interface
61 * (smartctl in particular) can cause underrun
62 * problems. Ignore these errors, perhaps at our
63 * peril.
64 */
65 return 0;
66
67 case SAS_DATA_OVERRUN:
68 case SAS_QUEUE_FULL:
69 case SAS_DEVICE_UNKNOWN:
70 case SAS_SG_ERR:
71 return AC_ERR_INVALID;
72
73 case SAM_CHECK_COND:
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 SAS_ABORTED_TASK:
81 return AC_ERR_DEV;
82
83 case SAS_PROTO_RESPONSE:
84 /* This means the ending_fis has the error
85 * value; return 0 here to collect it */
86 return 0;
87 default:
88 return 0;
89 }
90 }
91
92 static void sas_ata_task_done(struct sas_task *task)
93 {
94 struct ata_queued_cmd *qc = task->uldd_task;
95 struct domain_device *dev;
96 struct task_status_struct *stat = &task->task_status;
97 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
98 struct sas_ha_struct *sas_ha;
99 enum ata_completion_errors ac;
100 unsigned long flags;
101
102 if (!qc)
103 goto qc_already_gone;
104
105 dev = qc->ap->private_data;
106 sas_ha = dev->port->ha;
107
108 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
109 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
110 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
111 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
112 dev->sata_dev.sstatus = resp->sstatus;
113 dev->sata_dev.serror = resp->serror;
114 dev->sata_dev.scontrol = resp->scontrol;
115 } else if (stat->stat != SAM_STAT_GOOD) {
116 ac = sas_to_ata_err(stat);
117 if (ac) {
118 SAS_DPRINTK("%s: SAS error %x\n", __func__,
119 stat->stat);
120 /* We saw a SAS error. Send a vague error. */
121 qc->err_mask = ac;
122 dev->sata_dev.tf.feature = 0x04; /* status err */
123 dev->sata_dev.tf.command = ATA_ERR;
124 }
125 }
126
127 qc->lldd_task = NULL;
128 if (qc->scsicmd)
129 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
130 ata_qc_complete(qc);
131 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
132
133 /*
134 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
135 * flag is set, then we must have come in via the libsas EH
136 * functions. When we exit this function, we need to put the
137 * scsi_cmnd on the list of finished errors. The ata_qc_complete
138 * call cleans up the libata side of things but we're protected
139 * from the scsi_cmnd going away because the scsi_cmnd is owned
140 * by the EH, making libata's call to scsi_done a NOP.
141 */
142 spin_lock_irqsave(&task->task_state_lock, flags);
143 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
144 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
145 spin_unlock_irqrestore(&task->task_state_lock, flags);
146
147 qc_already_gone:
148 list_del_init(&task->list);
149 sas_free_task(task);
150 }
151
152 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
153 {
154 int res;
155 struct sas_task *task;
156 struct domain_device *dev = qc->ap->private_data;
157 struct sas_ha_struct *sas_ha = dev->port->ha;
158 struct Scsi_Host *host = sas_ha->core.shost;
159 struct sas_internal *i = to_sas_internal(host->transportt);
160 struct scatterlist *sg;
161 unsigned int xfer = 0;
162 unsigned int si;
163
164 task = sas_alloc_task(GFP_ATOMIC);
165 if (!task)
166 return AC_ERR_SYSTEM;
167 task->dev = dev;
168 task->task_proto = SAS_PROTOCOL_STP;
169 task->task_done = sas_ata_task_done;
170
171 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
172 qc->tf.command == ATA_CMD_FPDMA_READ) {
173 /* Need to zero out the tag libata assigned us */
174 qc->tf.nsect = 0;
175 }
176
177 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
178 task->uldd_task = qc;
179 if (ata_is_atapi(qc->tf.protocol)) {
180 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
181 task->total_xfer_len = qc->nbytes;
182 task->num_scatter = qc->n_elem;
183 } else {
184 for_each_sg(qc->sg, sg, qc->n_elem, si)
185 xfer += sg->length;
186
187 task->total_xfer_len = xfer;
188 task->num_scatter = si;
189 }
190
191 task->data_dir = qc->dma_dir;
192 task->scatter = qc->sg;
193 task->ata_task.retry_count = 1;
194 task->task_state_flags = SAS_TASK_STATE_PENDING;
195 qc->lldd_task = task;
196
197 switch (qc->tf.protocol) {
198 case ATA_PROT_NCQ:
199 task->ata_task.use_ncq = 1;
200 /* fall through */
201 case ATAPI_PROT_DMA:
202 case ATA_PROT_DMA:
203 task->ata_task.dma_xfer = 1;
204 break;
205 }
206
207 if (qc->scsicmd)
208 ASSIGN_SAS_TASK(qc->scsicmd, task);
209
210 if (sas_ha->lldd_max_execute_num < 2)
211 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
212 else
213 res = sas_queue_up(task);
214
215 /* Examine */
216 if (res) {
217 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
218
219 if (qc->scsicmd)
220 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
221 sas_free_task(task);
222 return AC_ERR_SYSTEM;
223 }
224
225 return 0;
226 }
227
228 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
229 {
230 struct domain_device *dev = qc->ap->private_data;
231
232 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
233 return true;
234 }
235
236 static void sas_ata_phy_reset(struct ata_port *ap)
237 {
238 struct domain_device *dev = ap->private_data;
239 struct sas_internal *i =
240 to_sas_internal(dev->port->ha->core.shost->transportt);
241 int res = TMF_RESP_FUNC_FAILED;
242
243 if (i->dft->lldd_I_T_nexus_reset)
244 res = i->dft->lldd_I_T_nexus_reset(dev);
245
246 if (res != TMF_RESP_FUNC_COMPLETE)
247 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
248
249 switch (dev->sata_dev.command_set) {
250 case ATA_COMMAND_SET:
251 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
252 ap->link.device[0].class = ATA_DEV_ATA;
253 break;
254 case ATAPI_COMMAND_SET:
255 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
256 ap->link.device[0].class = ATA_DEV_ATAPI;
257 break;
258 default:
259 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
260 __func__,
261 dev->sata_dev.command_set);
262 ap->link.device[0].class = ATA_DEV_UNKNOWN;
263 break;
264 }
265
266 ap->cbl = ATA_CBL_SATA;
267 }
268
269 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
270 {
271 if (qc->flags & ATA_QCFLAG_FAILED)
272 qc->err_mask |= AC_ERR_OTHER;
273
274 if (qc->err_mask) {
275 /*
276 * Find the sas_task and kill it. By this point,
277 * libata has decided to kill the qc, so we needn't
278 * bother with sas_ata_task_done. But we still
279 * ought to abort the task.
280 */
281 struct sas_task *task = qc->lldd_task;
282 unsigned long flags;
283
284 qc->lldd_task = NULL;
285 if (task) {
286 /* Should this be a AT(API) device reset? */
287 spin_lock_irqsave(&task->task_state_lock, flags);
288 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
289 spin_unlock_irqrestore(&task->task_state_lock, flags);
290
291 task->uldd_task = NULL;
292 __sas_task_abort(task);
293 }
294 }
295 }
296
297 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
298 u32 val)
299 {
300 struct domain_device *dev = link->ap->private_data;
301
302 SAS_DPRINTK("STUB %s\n", __func__);
303 switch (sc_reg_in) {
304 case SCR_STATUS:
305 dev->sata_dev.sstatus = val;
306 break;
307 case SCR_CONTROL:
308 dev->sata_dev.scontrol = val;
309 break;
310 case SCR_ERROR:
311 dev->sata_dev.serror = val;
312 break;
313 case SCR_ACTIVE:
314 dev->sata_dev.ap->link.sactive = val;
315 break;
316 default:
317 return -EINVAL;
318 }
319 return 0;
320 }
321
322 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
323 u32 *val)
324 {
325 struct domain_device *dev = link->ap->private_data;
326
327 SAS_DPRINTK("STUB %s\n", __func__);
328 switch (sc_reg_in) {
329 case SCR_STATUS:
330 *val = dev->sata_dev.sstatus;
331 return 0;
332 case SCR_CONTROL:
333 *val = dev->sata_dev.scontrol;
334 return 0;
335 case SCR_ERROR:
336 *val = dev->sata_dev.serror;
337 return 0;
338 case SCR_ACTIVE:
339 *val = dev->sata_dev.ap->link.sactive;
340 return 0;
341 default:
342 return -EINVAL;
343 }
344 }
345
346 static struct ata_port_operations sas_sata_ops = {
347 .phy_reset = sas_ata_phy_reset,
348 .post_internal_cmd = sas_ata_post_internal,
349 .qc_prep = ata_noop_qc_prep,
350 .qc_issue = sas_ata_qc_issue,
351 .qc_fill_rtf = sas_ata_qc_fill_rtf,
352 .port_start = ata_sas_port_start,
353 .port_stop = ata_sas_port_stop,
354 .scr_read = sas_ata_scr_read,
355 .scr_write = sas_ata_scr_write
356 };
357
358 static struct ata_port_info sata_port_info = {
359 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
360 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
361 .pio_mask = 0x1f, /* PIO0-4 */
362 .mwdma_mask = 0x07, /* MWDMA0-2 */
363 .udma_mask = ATA_UDMA6,
364 .port_ops = &sas_sata_ops
365 };
366
367 int sas_ata_init_host_and_port(struct domain_device *found_dev,
368 struct scsi_target *starget)
369 {
370 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
371 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
372 struct ata_port *ap;
373
374 ata_host_init(&found_dev->sata_dev.ata_host,
375 ha->dev,
376 sata_port_info.flags,
377 &sas_sata_ops);
378 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
379 &sata_port_info,
380 shost);
381 if (!ap) {
382 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
383 return -ENODEV;
384 }
385
386 ap->private_data = found_dev;
387 ap->cbl = ATA_CBL_SATA;
388 ap->scsi_host = shost;
389 found_dev->sata_dev.ap = ap;
390
391 return 0;
392 }
393
394 void sas_ata_task_abort(struct sas_task *task)
395 {
396 struct ata_queued_cmd *qc = task->uldd_task;
397 struct completion *waiting;
398
399 /* Bounce SCSI-initiated commands to the SCSI EH */
400 if (qc->scsicmd) {
401 blk_abort_request(qc->scsicmd->request);
402 scsi_schedule_eh(qc->scsicmd->device->host);
403 return;
404 }
405
406 /* Internal command, fake a timeout and complete. */
407 qc->flags &= ~ATA_QCFLAG_ACTIVE;
408 qc->flags |= ATA_QCFLAG_FAILED;
409 qc->err_mask |= AC_ERR_TIMEOUT;
410 waiting = qc->private_data;
411 complete(waiting);
412 }
413
414 static void sas_task_timedout(unsigned long _task)
415 {
416 struct sas_task *task = (void *) _task;
417 unsigned long flags;
418
419 spin_lock_irqsave(&task->task_state_lock, flags);
420 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
421 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
422 spin_unlock_irqrestore(&task->task_state_lock, flags);
423
424 complete(&task->completion);
425 }
426
427 static void sas_disc_task_done(struct sas_task *task)
428 {
429 if (!del_timer(&task->timer))
430 return;
431 complete(&task->completion);
432 }
433
434 #define SAS_DEV_TIMEOUT 10
435
436 /**
437 * sas_execute_task -- Basic task processing for discovery
438 * @task: the task to be executed
439 * @buffer: pointer to buffer to do I/O
440 * @size: size of @buffer
441 * @dma_dir: DMA direction. DMA_xxx
442 */
443 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
444 enum dma_data_direction dma_dir)
445 {
446 int res = 0;
447 struct scatterlist *scatter = NULL;
448 struct task_status_struct *ts = &task->task_status;
449 int num_scatter = 0;
450 int retries = 0;
451 struct sas_internal *i =
452 to_sas_internal(task->dev->port->ha->core.shost->transportt);
453
454 if (dma_dir != DMA_NONE) {
455 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
456 if (!scatter)
457 goto out;
458
459 sg_init_one(scatter, buffer, size);
460 num_scatter = 1;
461 }
462
463 task->task_proto = task->dev->tproto;
464 task->scatter = scatter;
465 task->num_scatter = num_scatter;
466 task->total_xfer_len = size;
467 task->data_dir = dma_dir;
468 task->task_done = sas_disc_task_done;
469 if (dma_dir != DMA_NONE &&
470 sas_protocol_ata(task->task_proto)) {
471 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
472 task->scatter,
473 task->num_scatter,
474 task->data_dir);
475 }
476
477 for (retries = 0; retries < 5; retries++) {
478 task->task_state_flags = SAS_TASK_STATE_PENDING;
479 init_completion(&task->completion);
480
481 task->timer.data = (unsigned long) task;
482 task->timer.function = sas_task_timedout;
483 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
484 add_timer(&task->timer);
485
486 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
487 if (res) {
488 del_timer(&task->timer);
489 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
490 res);
491 goto ex_err;
492 }
493 wait_for_completion(&task->completion);
494 res = -ECOMM;
495 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
496 int res2;
497 SAS_DPRINTK("task aborted, flags:0x%x\n",
498 task->task_state_flags);
499 res2 = i->dft->lldd_abort_task(task);
500 SAS_DPRINTK("came back from abort task\n");
501 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
502 if (res2 == TMF_RESP_FUNC_COMPLETE)
503 continue; /* Retry the task */
504 else
505 goto ex_err;
506 }
507 }
508 if (task->task_status.stat == SAM_BUSY ||
509 task->task_status.stat == SAM_TASK_SET_FULL ||
510 task->task_status.stat == SAS_QUEUE_FULL) {
511 SAS_DPRINTK("task: q busy, sleeping...\n");
512 schedule_timeout_interruptible(HZ);
513 } else if (task->task_status.stat == SAM_CHECK_COND) {
514 struct scsi_sense_hdr shdr;
515
516 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
517 &shdr)) {
518 SAS_DPRINTK("couldn't normalize sense\n");
519 continue;
520 }
521 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
522 (shdr.sense_key == 2 && shdr.asc == 4 &&
523 shdr.ascq == 1)) {
524 SAS_DPRINTK("device %016llx LUN: %016llx "
525 "powering up or not ready yet, "
526 "sleeping...\n",
527 SAS_ADDR(task->dev->sas_addr),
528 SAS_ADDR(task->ssp_task.LUN));
529
530 schedule_timeout_interruptible(5*HZ);
531 } else if (shdr.sense_key == 1) {
532 res = 0;
533 break;
534 } else if (shdr.sense_key == 5) {
535 break;
536 } else {
537 SAS_DPRINTK("dev %016llx LUN: %016llx "
538 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
539 "\n",
540 SAS_ADDR(task->dev->sas_addr),
541 SAS_ADDR(task->ssp_task.LUN),
542 shdr.sense_key,
543 shdr.asc, shdr.ascq);
544 }
545 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
546 task->task_status.stat != SAM_GOOD) {
547 SAS_DPRINTK("task finished with resp:0x%x, "
548 "stat:0x%x\n",
549 task->task_status.resp,
550 task->task_status.stat);
551 goto ex_err;
552 } else {
553 res = 0;
554 break;
555 }
556 }
557 ex_err:
558 if (dma_dir != DMA_NONE) {
559 if (sas_protocol_ata(task->task_proto))
560 dma_unmap_sg(task->dev->port->ha->dev,
561 task->scatter, task->num_scatter,
562 task->data_dir);
563 kfree(scatter);
564 }
565 out:
566 return res;
567 }
568
569 /* ---------- SATA ---------- */
570
571 static void sas_get_ata_command_set(struct domain_device *dev)
572 {
573 struct dev_to_host_fis *fis =
574 (struct dev_to_host_fis *) dev->frame_rcvd;
575
576 if ((fis->sector_count == 1 && /* ATA */
577 fis->lbal == 1 &&
578 fis->lbam == 0 &&
579 fis->lbah == 0 &&
580 fis->device == 0)
581 ||
582 (fis->sector_count == 0 && /* CE-ATA (mATA) */
583 fis->lbal == 0 &&
584 fis->lbam == 0xCE &&
585 fis->lbah == 0xAA &&
586 (fis->device & ~0x10) == 0))
587
588 dev->sata_dev.command_set = ATA_COMMAND_SET;
589
590 else if ((fis->interrupt_reason == 1 && /* ATAPI */
591 fis->lbal == 1 &&
592 fis->byte_count_low == 0x14 &&
593 fis->byte_count_high == 0xEB &&
594 (fis->device & ~0x10) == 0))
595
596 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
597
598 else if ((fis->sector_count == 1 && /* SEMB */
599 fis->lbal == 1 &&
600 fis->lbam == 0x3C &&
601 fis->lbah == 0xC3 &&
602 fis->device == 0)
603 ||
604 (fis->interrupt_reason == 1 && /* SATA PM */
605 fis->lbal == 1 &&
606 fis->byte_count_low == 0x69 &&
607 fis->byte_count_high == 0x96 &&
608 (fis->device & ~0x10) == 0))
609
610 /* Treat it as a superset? */
611 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
612 }
613
614 /**
615 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
616 * @dev: the device to send the command to
617 * @command: the command register
618 * @features: the features register
619 * @buffer: pointer to buffer to do I/O
620 * @size: size of @buffer
621 * @dma_dir: DMA direction. DMA_xxx
622 */
623 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
624 u8 features, void *buffer, int size,
625 enum dma_data_direction dma_dir)
626 {
627 int res = 0;
628 struct sas_task *task;
629 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
630 &dev->frame_rcvd[0];
631
632 res = -ENOMEM;
633 task = sas_alloc_task(GFP_KERNEL);
634 if (!task)
635 goto out;
636
637 task->dev = dev;
638
639 task->ata_task.fis.fis_type = 0x27;
640 task->ata_task.fis.command = command;
641 task->ata_task.fis.features = features;
642 task->ata_task.fis.device = d2h_fis->device;
643 task->ata_task.retry_count = 1;
644
645 res = sas_execute_task(task, buffer, size, dma_dir);
646
647 sas_free_task(task);
648 out:
649 return res;
650 }
651
652 #define ATA_IDENTIFY_DEV 0xEC
653 #define ATA_IDENTIFY_PACKET_DEV 0xA1
654 #define ATA_SET_FEATURES 0xEF
655 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
656
657 /**
658 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
659 * @dev: STP/SATA device of interest (ATA/ATAPI)
660 *
661 * The LLDD has already been notified of this device, so that we can
662 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
663 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
664 * performance for this device.
665 */
666 static int sas_discover_sata_dev(struct domain_device *dev)
667 {
668 int res;
669 __le16 *identify_x;
670 u8 command;
671
672 identify_x = kzalloc(512, GFP_KERNEL);
673 if (!identify_x)
674 return -ENOMEM;
675
676 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
677 dev->sata_dev.identify_device = identify_x;
678 command = ATA_IDENTIFY_DEV;
679 } else {
680 dev->sata_dev.identify_packet_device = identify_x;
681 command = ATA_IDENTIFY_PACKET_DEV;
682 }
683
684 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
685 DMA_FROM_DEVICE);
686 if (res)
687 goto out_err;
688
689 /* lives on the media? */
690 if (le16_to_cpu(identify_x[0]) & 4) {
691 /* incomplete response */
692 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
693 "dev %llx\n", SAS_ADDR(dev->sas_addr));
694 if (!(identify_x[83] & cpu_to_le16(1<<6)))
695 goto cont1;
696 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
697 ATA_FEATURE_PUP_STBY_SPIN_UP,
698 NULL, 0, DMA_NONE);
699 if (res)
700 goto cont1;
701
702 schedule_timeout_interruptible(5*HZ); /* More time? */
703 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
704 DMA_FROM_DEVICE);
705 if (res)
706 goto out_err;
707 }
708 cont1:
709 /* XXX Hint: register this SATA device with SATL.
710 When this returns, dev->sata_dev->lu is alive and
711 present.
712 sas_satl_register_dev(dev);
713 */
714
715 sas_fill_in_rphy(dev, dev->rphy);
716
717 return 0;
718 out_err:
719 dev->sata_dev.identify_packet_device = NULL;
720 dev->sata_dev.identify_device = NULL;
721 kfree(identify_x);
722 return res;
723 }
724
725 static int sas_discover_sata_pm(struct domain_device *dev)
726 {
727 return -ENODEV;
728 }
729
730 /**
731 * sas_discover_sata -- discover an STP/SATA domain device
732 * @dev: pointer to struct domain_device of interest
733 *
734 * First we notify the LLDD of this device, so we can send frames to
735 * it. Then depending on the type of device we call the appropriate
736 * discover functions. Once device discover is done, we notify the
737 * LLDD so that it can fine-tune its parameters for the device, by
738 * removing it and then adding it. That is, the second time around,
739 * the driver would have certain fields, that it is looking at, set.
740 * Finally we initialize the kobj so that the device can be added to
741 * the system at registration time. Devices directly attached to a HA
742 * port, have no parents. All other devices do, and should have their
743 * "parent" pointer set appropriately before calling this function.
744 */
745 int sas_discover_sata(struct domain_device *dev)
746 {
747 int res;
748
749 sas_get_ata_command_set(dev);
750
751 res = sas_notify_lldd_dev_found(dev);
752 if (res)
753 return res;
754
755 switch (dev->dev_type) {
756 case SATA_DEV:
757 res = sas_discover_sata_dev(dev);
758 break;
759 case SATA_PM:
760 res = sas_discover_sata_pm(dev);
761 break;
762 default:
763 break;
764 }
765 sas_notify_lldd_dev_gone(dev);
766 if (!res) {
767 sas_notify_lldd_dev_found(dev);
768 res = sas_rphy_add(dev->rphy);
769 }
770
771 return res;
772 }
Linux for Ginger Game Console