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[SCSI] libsas: Remove PCI dependencies
[linux-2.6/zen-sources.git] / drivers / scsi / libsas / sas_ata.c
blob5e573efcf0a70f90232ac916aa8897f85c5f713b
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->device[0].class = ATA_DEV_ATA;
253 break;
254 case ATAPI_COMMAND_SET:
255 SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
256 ap->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->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->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->sactive;
346 return 0;
347 default:
348 return -EINVAL;
349 }
350 }
351
352 static struct ata_port_operations sas_sata_ops = {
353 .port_disable = ata_port_disable,
354 .check_status = sas_ata_check_status,
355 .check_altstatus = sas_ata_check_status,
356 .dev_select = ata_noop_dev_select,
357 .phy_reset = sas_ata_phy_reset,
358 .post_internal_cmd = sas_ata_post_internal,
359 .tf_read = sas_ata_tf_read,
360 .qc_prep = ata_noop_qc_prep,
361 .qc_issue = sas_ata_qc_issue,
362 .port_start = ata_sas_port_start,
363 .port_stop = ata_sas_port_stop,
364 .scr_read = sas_ata_scr_read,
365 .scr_write = sas_ata_scr_write
366 };
367
368 static struct ata_port_info sata_port_info = {
369 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
370 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
371 .pio_mask = 0x1f, /* PIO0-4 */
372 .mwdma_mask = 0x07, /* MWDMA0-2 */
373 .udma_mask = ATA_UDMA6,
374 .port_ops = &sas_sata_ops
375 };
376
377 int sas_ata_init_host_and_port(struct domain_device *found_dev,
378 struct scsi_target *starget)
379 {
380 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
381 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
382 struct ata_port *ap;
383
384 ata_host_init(&found_dev->sata_dev.ata_host,
385 ha->dev,
386 sata_port_info.flags,
387 &sas_sata_ops);
388 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
389 &sata_port_info,
390 shost);
391 if (!ap) {
392 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
393 return -ENODEV;
394 }
395
396 ap->private_data = found_dev;
397 ap->cbl = ATA_CBL_SATA;
398 ap->scsi_host = shost;
399 found_dev->sata_dev.ap = ap;
400
401 return 0;
402 }
403
404 void sas_ata_task_abort(struct sas_task *task)
405 {
406 struct ata_queued_cmd *qc = task->uldd_task;
407 struct completion *waiting;
408
409 /* Bounce SCSI-initiated commands to the SCSI EH */
410 if (qc->scsicmd) {
411 scsi_req_abort_cmd(qc->scsicmd);
412 scsi_schedule_eh(qc->scsicmd->device->host);
413 return;
414 }
415
416 /* Internal command, fake a timeout and complete. */
417 qc->flags &= ~ATA_QCFLAG_ACTIVE;
418 qc->flags |= ATA_QCFLAG_FAILED;
419 qc->err_mask |= AC_ERR_TIMEOUT;
420 waiting = qc->private_data;
421 complete(waiting);
422 }
423
424 static void sas_task_timedout(unsigned long _task)
425 {
426 struct sas_task *task = (void *) _task;
427 unsigned long flags;
428
429 spin_lock_irqsave(&task->task_state_lock, flags);
430 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
431 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
432 spin_unlock_irqrestore(&task->task_state_lock, flags);
433
434 complete(&task->completion);
435 }
436
437 static void sas_disc_task_done(struct sas_task *task)
438 {
439 if (!del_timer(&task->timer))
440 return;
441 complete(&task->completion);
442 }
443
444 #define SAS_DEV_TIMEOUT 10
445
446 /**
447 * sas_execute_task -- Basic task processing for discovery
448 * @task: the task to be executed
449 * @buffer: pointer to buffer to do I/O
450 * @size: size of @buffer
451 * @dma_dir: DMA direction. DMA_xxx
452 */
453 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
454 enum dma_data_direction dma_dir)
455 {
456 int res = 0;
457 struct scatterlist *scatter = NULL;
458 struct task_status_struct *ts = &task->task_status;
459 int num_scatter = 0;
460 int retries = 0;
461 struct sas_internal *i =
462 to_sas_internal(task->dev->port->ha->core.shost->transportt);
463
464 if (dma_dir != DMA_NONE) {
465 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
466 if (!scatter)
467 goto out;
468
469 sg_init_one(scatter, buffer, size);
470 num_scatter = 1;
471 }
472
473 task->task_proto = task->dev->tproto;
474 task->scatter = scatter;
475 task->num_scatter = num_scatter;
476 task->total_xfer_len = size;
477 task->data_dir = dma_dir;
478 task->task_done = sas_disc_task_done;
479 if (dma_dir != DMA_NONE &&
480 sas_protocol_ata(task->task_proto)) {
481 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
482 task->scatter,
483 task->num_scatter,
484 task->data_dir);
485 }
486
487 for (retries = 0; retries < 5; retries++) {
488 task->task_state_flags = SAS_TASK_STATE_PENDING;
489 init_completion(&task->completion);
490
491 task->timer.data = (unsigned long) task;
492 task->timer.function = sas_task_timedout;
493 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
494 add_timer(&task->timer);
495
496 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
497 if (res) {
498 del_timer(&task->timer);
499 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
500 res);
501 goto ex_err;
502 }
503 wait_for_completion(&task->completion);
504 res = -ETASK;
505 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
506 int res2;
507 SAS_DPRINTK("task aborted, flags:0x%x\n",
508 task->task_state_flags);
509 res2 = i->dft->lldd_abort_task(task);
510 SAS_DPRINTK("came back from abort task\n");
511 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
512 if (res2 == TMF_RESP_FUNC_COMPLETE)
513 continue; /* Retry the task */
514 else
515 goto ex_err;
516 }
517 }
518 if (task->task_status.stat == SAM_BUSY ||
519 task->task_status.stat == SAM_TASK_SET_FULL ||
520 task->task_status.stat == SAS_QUEUE_FULL) {
521 SAS_DPRINTK("task: q busy, sleeping...\n");
522 schedule_timeout_interruptible(HZ);
523 } else if (task->task_status.stat == SAM_CHECK_COND) {
524 struct scsi_sense_hdr shdr;
525
526 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
527 &shdr)) {
528 SAS_DPRINTK("couldn't normalize sense\n");
529 continue;
530 }
531 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
532 (shdr.sense_key == 2 && shdr.asc == 4 &&
533 shdr.ascq == 1)) {
534 SAS_DPRINTK("device %016llx LUN: %016llx "
535 "powering up or not ready yet, "
536 "sleeping...\n",
537 SAS_ADDR(task->dev->sas_addr),
538 SAS_ADDR(task->ssp_task.LUN));
539
540 schedule_timeout_interruptible(5*HZ);
541 } else if (shdr.sense_key == 1) {
542 res = 0;
543 break;
544 } else if (shdr.sense_key == 5) {
545 break;
546 } else {
547 SAS_DPRINTK("dev %016llx LUN: %016llx "
548 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
549 "\n",
550 SAS_ADDR(task->dev->sas_addr),
551 SAS_ADDR(task->ssp_task.LUN),
552 shdr.sense_key,
553 shdr.asc, shdr.ascq);
554 }
555 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
556 task->task_status.stat != SAM_GOOD) {
557 SAS_DPRINTK("task finished with resp:0x%x, "
558 "stat:0x%x\n",
559 task->task_status.resp,
560 task->task_status.stat);
561 goto ex_err;
562 } else {
563 res = 0;
564 break;
565 }
566 }
567 ex_err:
568 if (dma_dir != DMA_NONE) {
569 if (sas_protocol_ata(task->task_proto))
570 dma_unmap_sg(task->dev->port->ha->dev,
571 task->scatter, task->num_scatter,
572 task->data_dir);
573 kfree(scatter);
574 }
575 out:
576 return res;
577 }
578
579 /* ---------- SATA ---------- */
580
581 static void sas_get_ata_command_set(struct domain_device *dev)
582 {
583 struct dev_to_host_fis *fis =
584 (struct dev_to_host_fis *) dev->frame_rcvd;
585
586 if ((fis->sector_count == 1 && /* ATA */
587 fis->lbal == 1 &&
588 fis->lbam == 0 &&
589 fis->lbah == 0 &&
590 fis->device == 0)
591 ||
592 (fis->sector_count == 0 && /* CE-ATA (mATA) */
593 fis->lbal == 0 &&
594 fis->lbam == 0xCE &&
595 fis->lbah == 0xAA &&
596 (fis->device & ~0x10) == 0))
597
598 dev->sata_dev.command_set = ATA_COMMAND_SET;
599
600 else if ((fis->interrupt_reason == 1 && /* ATAPI */
601 fis->lbal == 1 &&
602 fis->byte_count_low == 0x14 &&
603 fis->byte_count_high == 0xEB &&
604 (fis->device & ~0x10) == 0))
605
606 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
607
608 else if ((fis->sector_count == 1 && /* SEMB */
609 fis->lbal == 1 &&
610 fis->lbam == 0x3C &&
611 fis->lbah == 0xC3 &&
612 fis->device == 0)
613 ||
614 (fis->interrupt_reason == 1 && /* SATA PM */
615 fis->lbal == 1 &&
616 fis->byte_count_low == 0x69 &&
617 fis->byte_count_high == 0x96 &&
618 (fis->device & ~0x10) == 0))
619
620 /* Treat it as a superset? */
621 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
622 }
623
624 /**
625 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
626 * @dev: the device to send the command to
627 * @command: the command register
628 * @features: the features register
629 * @buffer: pointer to buffer to do I/O
630 * @size: size of @buffer
631 * @dma_dir: DMA direction. DMA_xxx
632 */
633 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
634 u8 features, void *buffer, int size,
635 enum dma_data_direction dma_dir)
636 {
637 int res = 0;
638 struct sas_task *task;
639 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
640 &dev->frame_rcvd[0];
641
642 res = -ENOMEM;
643 task = sas_alloc_task(GFP_KERNEL);
644 if (!task)
645 goto out;
646
647 task->dev = dev;
648
649 task->ata_task.fis.fis_type = 0x27;
650 task->ata_task.fis.command = command;
651 task->ata_task.fis.features = features;
652 task->ata_task.fis.device = d2h_fis->device;
653 task->ata_task.retry_count = 1;
654
655 res = sas_execute_task(task, buffer, size, dma_dir);
656
657 sas_free_task(task);
658 out:
659 return res;
660 }
661
662 static void sas_sata_propagate_sas_addr(struct domain_device *dev)
663 {
664 unsigned long flags;
665 struct asd_sas_port *port = dev->port;
666 struct asd_sas_phy *phy;
667
668 BUG_ON(dev->parent);
669
670 memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
671 spin_lock_irqsave(&port->phy_list_lock, flags);
672 list_for_each_entry(phy, &port->phy_list, port_phy_el)
673 memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
674 spin_unlock_irqrestore(&port->phy_list_lock, flags);
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 (!le16_to_cpu(identify_x[83] & (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 /* Get WWN */
735 if (dev->port->oob_mode != SATA_OOB_MODE) {
736 memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
737 SAS_ADDR_SIZE);
738 } else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
739 (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
740 == 0x5000) {
741 int i;
742
743 for (i = 0; i < 4; i++) {
744 dev->sas_addr[2*i] =
745 (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
746 dev->sas_addr[2*i+1] =
747 le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
748 }
749 }
750 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
751 if (!dev->parent)
752 sas_sata_propagate_sas_addr(dev);
753
754 /* XXX Hint: register this SATA device with SATL.
755 When this returns, dev->sata_dev->lu is alive and
756 present.
757 sas_satl_register_dev(dev);
758 */
759
760 sas_fill_in_rphy(dev, dev->rphy);
761
762 return 0;
763 out_err:
764 dev->sata_dev.identify_packet_device = NULL;
765 dev->sata_dev.identify_device = NULL;
766 kfree(identify_x);
767 return res;
768 }
769
770 static int sas_discover_sata_pm(struct domain_device *dev)
771 {
772 return -ENODEV;
773 }
774
775 /**
776 * sas_discover_sata -- discover an STP/SATA domain device
777 * @dev: pointer to struct domain_device of interest
778 *
779 * First we notify the LLDD of this device, so we can send frames to
780 * it. Then depending on the type of device we call the appropriate
781 * discover functions. Once device discover is done, we notify the
782 * LLDD so that it can fine-tune its parameters for the device, by
783 * removing it and then adding it. That is, the second time around,
784 * the driver would have certain fields, that it is looking at, set.
785 * Finally we initialize the kobj so that the device can be added to
786 * the system at registration time. Devices directly attached to a HA
787 * port, have no parents. All other devices do, and should have their
788 * "parent" pointer set appropriately before calling this function.
789 */
790 int sas_discover_sata(struct domain_device *dev)
791 {
792 int res;
793
794 sas_get_ata_command_set(dev);
795
796 res = sas_notify_lldd_dev_found(dev);
797 if (res)
798 return res;
799
800 switch (dev->dev_type) {
801 case SATA_DEV:
802 res = sas_discover_sata_dev(dev);
803 break;
804 case SATA_PM:
805 res = sas_discover_sata_pm(dev);
806 break;
807 default:
808 break;
809 }
810 sas_notify_lldd_dev_gone(dev);
811 if (!res) {
812 sas_notify_lldd_dev_found(dev);
813 res = sas_rphy_add(dev->rphy);
814 }
815
816 return res;
817 }
Stable & featurefull patchset based on Linus's git branch