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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / scsi / libsas / sas_ata.c
blob0829b55c64d23c90cf70b025a566447eed8635f0
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 __FUNCTION__, 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", __FUNCTION__,
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 num = 0;
162 unsigned int xfer = 0;
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 (is_atapi_taskfile(&qc->tf)) {
180 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
181 task->total_xfer_len = qc->nbytes + qc->pad_len;
182 task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
183 } else {
184 ata_for_each_sg(sg, qc) {
185 num++;
186 xfer += sg->length;
187 }
188
189 task->total_xfer_len = xfer;
190 task->num_scatter = num;
191 }
192
193 task->data_dir = qc->dma_dir;
194 task->scatter = qc->__sg;
195 task->ata_task.retry_count = 1;
196 task->task_state_flags = SAS_TASK_STATE_PENDING;
197 qc->lldd_task = task;
198
199 switch (qc->tf.protocol) {
200 case ATA_PROT_NCQ:
201 task->ata_task.use_ncq = 1;
202 /* fall through */
203 case ATA_PROT_ATAPI_DMA:
204 case ATA_PROT_DMA:
205 task->ata_task.dma_xfer = 1;
206 break;
207 }
208
209 if (qc->scsicmd)
210 ASSIGN_SAS_TASK(qc->scsicmd, task);
211
212 if (sas_ha->lldd_max_execute_num < 2)
213 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
214 else
215 res = sas_queue_up(task);
216
217 /* Examine */
218 if (res) {
219 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
220
221 if (qc->scsicmd)
222 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
223 sas_free_task(task);
224 return AC_ERR_SYSTEM;
225 }
226
227 return 0;
228 }
229
230 static u8 sas_ata_check_status(struct ata_port *ap)
231 {
232 struct domain_device *dev = ap->private_data;
233 return dev->sata_dev.tf.command;
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 = 0;
242
243 if (i->dft->lldd_I_T_nexus_reset)
244 res = i->dft->lldd_I_T_nexus_reset(dev);
245
246 if (res)
247 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);
248
249 switch (dev->sata_dev.command_set) {
250 case ATA_COMMAND_SET:
251 SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
252 ap->link.device[0].class = ATA_DEV_ATA;
253 break;
254 case ATAPI_COMMAND_SET:
255 SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
256 ap->link.device[0].class = ATA_DEV_ATAPI;
257 break;
258 default:
259 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
260 __FUNCTION__,
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 void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
298 {
299 struct domain_device *dev = ap->private_data;
300 memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
301 }
302
303 static int sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
304 u32 val)
305 {
306 struct domain_device *dev = ap->private_data;
307
308 SAS_DPRINTK("STUB %s\n", __FUNCTION__);
309 switch (sc_reg_in) {
310 case SCR_STATUS:
311 dev->sata_dev.sstatus = val;
312 break;
313 case SCR_CONTROL:
314 dev->sata_dev.scontrol = val;
315 break;
316 case SCR_ERROR:
317 dev->sata_dev.serror = val;
318 break;
319 case SCR_ACTIVE:
320 dev->sata_dev.ap->link.sactive = val;
321 break;
322 default:
323 return -EINVAL;
324 }
325 return 0;
326 }
327
328 static int sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
329 u32 *val)
330 {
331 struct domain_device *dev = ap->private_data;
332
333 SAS_DPRINTK("STUB %s\n", __FUNCTION__);
334 switch (sc_reg_in) {
335 case SCR_STATUS:
336 *val = dev->sata_dev.sstatus;
337 return 0;
338 case SCR_CONTROL:
339 *val = dev->sata_dev.scontrol;
340 return 0;
341 case SCR_ERROR:
342 *val = dev->sata_dev.serror;
343 return 0;
344 case SCR_ACTIVE:
345 *val = dev->sata_dev.ap->link.sactive;
346 return 0;
347 default:
348 return -EINVAL;
349 }
350 }
351
352 static struct ata_port_operations sas_sata_ops = {
353 .check_status = sas_ata_check_status,
354 .check_altstatus = sas_ata_check_status,
355 .dev_select = ata_noop_dev_select,
356 .phy_reset = sas_ata_phy_reset,
357 .post_internal_cmd = sas_ata_post_internal,
358 .tf_read = sas_ata_tf_read,
359 .qc_prep = ata_noop_qc_prep,
360 .qc_issue = sas_ata_qc_issue,
361 .port_start = ata_sas_port_start,
362 .port_stop = ata_sas_port_stop,
363 .scr_read = sas_ata_scr_read,
364 .scr_write = sas_ata_scr_write
365 };
366
367 static struct ata_port_info sata_port_info = {
368 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
369 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
370 .pio_mask = 0x1f, /* PIO0-4 */
371 .mwdma_mask = 0x07, /* MWDMA0-2 */
372 .udma_mask = ATA_UDMA6,
373 .port_ops = &sas_sata_ops
374 };
375
376 int sas_ata_init_host_and_port(struct domain_device *found_dev,
377 struct scsi_target *starget)
378 {
379 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
380 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
381 struct ata_port *ap;
382
383 ata_host_init(&found_dev->sata_dev.ata_host,
384 ha->dev,
385 sata_port_info.flags,
386 &sas_sata_ops);
387 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
388 &sata_port_info,
389 shost);
390 if (!ap) {
391 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
392 return -ENODEV;
393 }
394
395 ap->private_data = found_dev;
396 ap->cbl = ATA_CBL_SATA;
397 ap->scsi_host = shost;
398 found_dev->sata_dev.ap = ap;
399
400 return 0;
401 }
402
403 void sas_ata_task_abort(struct sas_task *task)
404 {
405 struct ata_queued_cmd *qc = task->uldd_task;
406 struct completion *waiting;
407
408 /* Bounce SCSI-initiated commands to the SCSI EH */
409 if (qc->scsicmd) {
410 scsi_req_abort_cmd(qc->scsicmd);
411 scsi_schedule_eh(qc->scsicmd->device->host);
412 return;
413 }
414
415 /* Internal command, fake a timeout and complete. */
416 qc->flags &= ~ATA_QCFLAG_ACTIVE;
417 qc->flags |= ATA_QCFLAG_FAILED;
418 qc->err_mask |= AC_ERR_TIMEOUT;
419 waiting = qc->private_data;
420 complete(waiting);
421 }
422
423 static void sas_task_timedout(unsigned long _task)
424 {
425 struct sas_task *task = (void *) _task;
426 unsigned long flags;
427
428 spin_lock_irqsave(&task->task_state_lock, flags);
429 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
430 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
431 spin_unlock_irqrestore(&task->task_state_lock, flags);
432
433 complete(&task->completion);
434 }
435
436 static void sas_disc_task_done(struct sas_task *task)
437 {
438 if (!del_timer(&task->timer))
439 return;
440 complete(&task->completion);
441 }
442
443 #define SAS_DEV_TIMEOUT 10
444
445 /**
446 * sas_execute_task -- Basic task processing for discovery
447 * @task: the task to be executed
448 * @buffer: pointer to buffer to do I/O
449 * @size: size of @buffer
450 * @dma_dir: DMA direction. DMA_xxx
451 */
452 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
453 enum dma_data_direction dma_dir)
454 {
455 int res = 0;
456 struct scatterlist *scatter = NULL;
457 struct task_status_struct *ts = &task->task_status;
458 int num_scatter = 0;
459 int retries = 0;
460 struct sas_internal *i =
461 to_sas_internal(task->dev->port->ha->core.shost->transportt);
462
463 if (dma_dir != DMA_NONE) {
464 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
465 if (!scatter)
466 goto out;
467
468 sg_init_one(scatter, buffer, size);
469 num_scatter = 1;
470 }
471
472 task->task_proto = task->dev->tproto;
473 task->scatter = scatter;
474 task->num_scatter = num_scatter;
475 task->total_xfer_len = size;
476 task->data_dir = dma_dir;
477 task->task_done = sas_disc_task_done;
478 if (dma_dir != DMA_NONE &&
479 sas_protocol_ata(task->task_proto)) {
480 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
481 task->scatter,
482 task->num_scatter,
483 task->data_dir);
484 }
485
486 for (retries = 0; retries < 5; retries++) {
487 task->task_state_flags = SAS_TASK_STATE_PENDING;
488 init_completion(&task->completion);
489
490 task->timer.data = (unsigned long) task;
491 task->timer.function = sas_task_timedout;
492 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
493 add_timer(&task->timer);
494
495 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
496 if (res) {
497 del_timer(&task->timer);
498 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
499 res);
500 goto ex_err;
501 }
502 wait_for_completion(&task->completion);
503 res = -ETASK;
504 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
505 int res2;
506 SAS_DPRINTK("task aborted, flags:0x%x\n",
507 task->task_state_flags);
508 res2 = i->dft->lldd_abort_task(task);
509 SAS_DPRINTK("came back from abort task\n");
510 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
511 if (res2 == TMF_RESP_FUNC_COMPLETE)
512 continue; /* Retry the task */
513 else
514 goto ex_err;
515 }
516 }
517 if (task->task_status.stat == SAM_BUSY ||
518 task->task_status.stat == SAM_TASK_SET_FULL ||
519 task->task_status.stat == SAS_QUEUE_FULL) {
520 SAS_DPRINTK("task: q busy, sleeping...\n");
521 schedule_timeout_interruptible(HZ);
522 } else if (task->task_status.stat == SAM_CHECK_COND) {
523 struct scsi_sense_hdr shdr;
524
525 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
526 &shdr)) {
527 SAS_DPRINTK("couldn't normalize sense\n");
528 continue;
529 }
530 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
531 (shdr.sense_key == 2 && shdr.asc == 4 &&
532 shdr.ascq == 1)) {
533 SAS_DPRINTK("device %016llx LUN: %016llx "
534 "powering up or not ready yet, "
535 "sleeping...\n",
536 SAS_ADDR(task->dev->sas_addr),
537 SAS_ADDR(task->ssp_task.LUN));
538
539 schedule_timeout_interruptible(5*HZ);
540 } else if (shdr.sense_key == 1) {
541 res = 0;
542 break;
543 } else if (shdr.sense_key == 5) {
544 break;
545 } else {
546 SAS_DPRINTK("dev %016llx LUN: %016llx "
547 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
548 "\n",
549 SAS_ADDR(task->dev->sas_addr),
550 SAS_ADDR(task->ssp_task.LUN),
551 shdr.sense_key,
552 shdr.asc, shdr.ascq);
553 }
554 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
555 task->task_status.stat != SAM_GOOD) {
556 SAS_DPRINTK("task finished with resp:0x%x, "
557 "stat:0x%x\n",
558 task->task_status.resp,
559 task->task_status.stat);
560 goto ex_err;
561 } else {
562 res = 0;
563 break;
564 }
565 }
566 ex_err:
567 if (dma_dir != DMA_NONE) {
568 if (sas_protocol_ata(task->task_proto))
569 dma_unmap_sg(task->dev->port->ha->dev,
570 task->scatter, task->num_scatter,
571 task->data_dir);
572 kfree(scatter);
573 }
574 out:
575 return res;
576 }
577
578 /* ---------- SATA ---------- */
579
580 static void sas_get_ata_command_set(struct domain_device *dev)
581 {
582 struct dev_to_host_fis *fis =
583 (struct dev_to_host_fis *) dev->frame_rcvd;
584
585 if ((fis->sector_count == 1 && /* ATA */
586 fis->lbal == 1 &&
587 fis->lbam == 0 &&
588 fis->lbah == 0 &&
589 fis->device == 0)
590 ||
591 (fis->sector_count == 0 && /* CE-ATA (mATA) */
592 fis->lbal == 0 &&
593 fis->lbam == 0xCE &&
594 fis->lbah == 0xAA &&
595 (fis->device & ~0x10) == 0))
596
597 dev->sata_dev.command_set = ATA_COMMAND_SET;
598
599 else if ((fis->interrupt_reason == 1 && /* ATAPI */
600 fis->lbal == 1 &&
601 fis->byte_count_low == 0x14 &&
602 fis->byte_count_high == 0xEB &&
603 (fis->device & ~0x10) == 0))
604
605 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
606
607 else if ((fis->sector_count == 1 && /* SEMB */
608 fis->lbal == 1 &&
609 fis->lbam == 0x3C &&
610 fis->lbah == 0xC3 &&
611 fis->device == 0)
612 ||
613 (fis->interrupt_reason == 1 && /* SATA PM */
614 fis->lbal == 1 &&
615 fis->byte_count_low == 0x69 &&
616 fis->byte_count_high == 0x96 &&
617 (fis->device & ~0x10) == 0))
618
619 /* Treat it as a superset? */
620 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
621 }
622
623 /**
624 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
625 * @dev: the device to send the command to
626 * @command: the command register
627 * @features: the features register
628 * @buffer: pointer to buffer to do I/O
629 * @size: size of @buffer
630 * @dma_dir: DMA direction. DMA_xxx
631 */
632 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
633 u8 features, void *buffer, int size,
634 enum dma_data_direction dma_dir)
635 {
636 int res = 0;
637 struct sas_task *task;
638 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
639 &dev->frame_rcvd[0];
640
641 res = -ENOMEM;
642 task = sas_alloc_task(GFP_KERNEL);
643 if (!task)
644 goto out;
645
646 task->dev = dev;
647
648 task->ata_task.fis.fis_type = 0x27;
649 task->ata_task.fis.command = command;
650 task->ata_task.fis.features = features;
651 task->ata_task.fis.device = d2h_fis->device;
652 task->ata_task.retry_count = 1;
653
654 res = sas_execute_task(task, buffer, size, dma_dir);
655
656 sas_free_task(task);
657 out:
658 return res;
659 }
660
661 static void sas_sata_propagate_sas_addr(struct domain_device *dev)
662 {
663 unsigned long flags;
664 struct asd_sas_port *port = dev->port;
665 struct asd_sas_phy *phy;
666
667 BUG_ON(dev->parent);
668
669 memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
670 spin_lock_irqsave(&port->phy_list_lock, flags);
671 list_for_each_entry(phy, &port->phy_list, port_phy_el)
672 memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
673 spin_unlock_irqrestore(&port->phy_list_lock, flags);
674 }
675
676 #define ATA_IDENTIFY_DEV 0xEC
677 #define ATA_IDENTIFY_PACKET_DEV 0xA1
678 #define ATA_SET_FEATURES 0xEF
679 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
680
681 /**
682 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
683 * @dev: STP/SATA device of interest (ATA/ATAPI)
684 *
685 * The LLDD has already been notified of this device, so that we can
686 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
687 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
688 * performance for this device.
689 */
690 static int sas_discover_sata_dev(struct domain_device *dev)
691 {
692 int res;
693 __le16 *identify_x;
694 u8 command;
695
696 identify_x = kzalloc(512, GFP_KERNEL);
697 if (!identify_x)
698 return -ENOMEM;
699
700 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
701 dev->sata_dev.identify_device = identify_x;
702 command = ATA_IDENTIFY_DEV;
703 } else {
704 dev->sata_dev.identify_packet_device = identify_x;
705 command = ATA_IDENTIFY_PACKET_DEV;
706 }
707
708 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
709 DMA_FROM_DEVICE);
710 if (res)
711 goto out_err;
712
713 /* lives on the media? */
714 if (le16_to_cpu(identify_x[0]) & 4) {
715 /* incomplete response */
716 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
717 "dev %llx\n", SAS_ADDR(dev->sas_addr));
718 if (!le16_to_cpu(identify_x[83] & (1<<6)))
719 goto cont1;
720 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
721 ATA_FEATURE_PUP_STBY_SPIN_UP,
722 NULL, 0, DMA_NONE);
723 if (res)
724 goto cont1;
725
726 schedule_timeout_interruptible(5*HZ); /* More time? */
727 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
728 DMA_FROM_DEVICE);
729 if (res)
730 goto out_err;
731 }
732 cont1:
733 /* Get WWN */
734 if (dev->port->oob_mode != SATA_OOB_MODE) {
735 memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
736 SAS_ADDR_SIZE);
737 } else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
738 (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
739 == 0x5000) {
740 int i;
741
742 for (i = 0; i < 4; i++) {
743 dev->sas_addr[2*i] =
744 (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
745 dev->sas_addr[2*i+1] =
746 le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
747 }
748 }
749 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
750 if (!dev->parent)
751 sas_sata_propagate_sas_addr(dev);
752
753 /* XXX Hint: register this SATA device with SATL.
754 When this returns, dev->sata_dev->lu is alive and
755 present.
756 sas_satl_register_dev(dev);
757 */
758
759 sas_fill_in_rphy(dev, dev->rphy);
760
761 return 0;
762 out_err:
763 dev->sata_dev.identify_packet_device = NULL;
764 dev->sata_dev.identify_device = NULL;
765 kfree(identify_x);
766 return res;
767 }
768
769 static int sas_discover_sata_pm(struct domain_device *dev)
770 {
771 return -ENODEV;
772 }
773
774 /**
775 * sas_discover_sata -- discover an STP/SATA domain device
776 * @dev: pointer to struct domain_device of interest
777 *
778 * First we notify the LLDD of this device, so we can send frames to
779 * it. Then depending on the type of device we call the appropriate
780 * discover functions. Once device discover is done, we notify the
781 * LLDD so that it can fine-tune its parameters for the device, by
782 * removing it and then adding it. That is, the second time around,
783 * the driver would have certain fields, that it is looking at, set.
784 * Finally we initialize the kobj so that the device can be added to
785 * the system at registration time. Devices directly attached to a HA
786 * port, have no parents. All other devices do, and should have their
787 * "parent" pointer set appropriately before calling this function.
788 */
789 int sas_discover_sata(struct domain_device *dev)
790 {
791 int res;
792
793 sas_get_ata_command_set(dev);
794
795 res = sas_notify_lldd_dev_found(dev);
796 if (res)
797 return res;
798
799 switch (dev->dev_type) {
800 case SATA_DEV:
801 res = sas_discover_sata_dev(dev);
802 break;
803 case SATA_PM:
804 res = sas_discover_sata_pm(dev);
805 break;
806 default:
807 break;
808 }
809 sas_notify_lldd_dev_gone(dev);
810 if (!res) {
811 sas_notify_lldd_dev_found(dev);
812 res = sas_rphy_add(dev->rphy);
813 }
814
815 return res;
816 }
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