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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
39static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
40{
41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
42
43 /* transport error */
44 if (ts->resp == SAS_TASK_UNDELIVERED)
45 return AC_ERR_ATA_BUS;
46
47 /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
49 switch (ts->stat) {
50 case SAS_DEV_NO_RESPONSE:
51 return AC_ERR_TIMEOUT;
52
53 case SAS_INTERRUPTED:
54 case SAS_PHY_DOWN:
55 case SAS_NAK_R_ERR:
56 return AC_ERR_ATA_BUS;
57
58
59 case SAS_DATA_UNDERRUN:
60 /*
61 * Some programs that use the taskfile interface
62 * (smartctl in particular) can cause underrun
63 * problems. Ignore these errors, perhaps at our
64 * peril.
65 */
66 return 0;
67
68 case SAS_DATA_OVERRUN:
69 case SAS_QUEUE_FULL:
70 case SAS_DEVICE_UNKNOWN:
71 case SAS_SG_ERR:
72 return AC_ERR_INVALID;
73
74 case SAS_OPEN_TO:
75 case SAS_OPEN_REJECT:
76 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
77 __func__, ts->stat);
78 return AC_ERR_OTHER;
79
80 case SAM_STAT_CHECK_CONDITION:
81 case SAS_ABORTED_TASK:
82 return AC_ERR_DEV;
83
84 case SAS_PROTO_RESPONSE:
85 /* This means the ending_fis has the error
86 * value; return 0 here to collect it */
87 return 0;
88 default:
89 return 0;
90 }
91}
92
93static void sas_ata_task_done(struct sas_task *task)
94{
95 struct ata_queued_cmd *qc = task->uldd_task;
96 struct domain_device *dev;
97 struct task_status_struct *stat = &task->task_status;
98 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
99 struct sas_ha_struct *sas_ha;
100 enum ata_completion_errors ac;
101 unsigned long flags;
102 struct ata_link *link;
103
104 if (!qc)
105 goto qc_already_gone;
106
107 dev = qc->ap->private_data;
108 sas_ha = dev->port->ha;
109 link = &dev->sata_dev.ap->link;
110
111 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
112 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
113 ((stat->stat == SAM_STAT_CHECK_CONDITION &&
114 dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
115 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
116
117 if (!link->sactive) {
118 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
119 } else {
120 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
121 if (unlikely(link->eh_info.err_mask))
122 qc->flags |= ATA_QCFLAG_FAILED;
123 }
124
125 dev->sata_dev.sstatus = resp->sstatus;
126 dev->sata_dev.serror = resp->serror;
127 dev->sata_dev.scontrol = resp->scontrol;
128 } else {
129 ac = sas_to_ata_err(stat);
130 if (ac) {
131 SAS_DPRINTK("%s: SAS error %x\n", __func__,
132 stat->stat);
133 /* We saw a SAS error. Send a vague error. */
134 if (!link->sactive) {
135 qc->err_mask = ac;
136 } else {
137 link->eh_info.err_mask |= AC_ERR_DEV;
138 qc->flags |= ATA_QCFLAG_FAILED;
139 }
140
141 dev->sata_dev.tf.feature = 0x04; /* status err */
142 dev->sata_dev.tf.command = ATA_ERR;
143 }
144 }
145
146 qc->lldd_task = NULL;
147 if (qc->scsicmd)
148 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
149 ata_qc_complete(qc);
150 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
151
152 /*
153 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
154 * flag is set, then we must have come in via the libsas EH
155 * functions. When we exit this function, we need to put the
156 * scsi_cmnd on the list of finished errors. The ata_qc_complete
157 * call cleans up the libata side of things but we're protected
158 * from the scsi_cmnd going away because the scsi_cmnd is owned
159 * by the EH, making libata's call to scsi_done a NOP.
160 */
161 spin_lock_irqsave(&task->task_state_lock, flags);
162 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
163 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
164 spin_unlock_irqrestore(&task->task_state_lock, flags);
165
166qc_already_gone:
167 list_del_init(&task->list);
168 sas_free_task(task);
169}
170
171static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
172{
173 int res;
174 struct sas_task *task;
175 struct domain_device *dev = qc->ap->private_data;
176 struct sas_ha_struct *sas_ha = dev->port->ha;
177 struct Scsi_Host *host = sas_ha->core.shost;
178 struct sas_internal *i = to_sas_internal(host->transportt);
179 struct scatterlist *sg;
180 unsigned int xfer = 0;
181 unsigned int si;
182
183 /* If the device fell off, no sense in issuing commands */
184 if (dev->gone)
185 return AC_ERR_SYSTEM;
186
187 task = sas_alloc_task(GFP_ATOMIC);
188 if (!task)
189 return AC_ERR_SYSTEM;
190 task->dev = dev;
191 task->task_proto = SAS_PROTOCOL_STP;
192 task->task_done = sas_ata_task_done;
193
194 if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
195 qc->tf.command == ATA_CMD_FPDMA_READ) {
196 /* Need to zero out the tag libata assigned us */
197 qc->tf.nsect = 0;
198 }
199
200 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
201 task->uldd_task = qc;
202 if (ata_is_atapi(qc->tf.protocol)) {
203 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
204 task->total_xfer_len = qc->nbytes;
205 task->num_scatter = qc->n_elem;
206 } else {
207 for_each_sg(qc->sg, sg, qc->n_elem, si)
208 xfer += sg->length;
209
210 task->total_xfer_len = xfer;
211 task->num_scatter = si;
212 }
213
214 task->data_dir = qc->dma_dir;
215 task->scatter = qc->sg;
216 task->ata_task.retry_count = 1;
217 task->task_state_flags = SAS_TASK_STATE_PENDING;
218 qc->lldd_task = task;
219
220 switch (qc->tf.protocol) {
221 case ATA_PROT_NCQ:
222 task->ata_task.use_ncq = 1;
223 /* fall through */
224 case ATAPI_PROT_DMA:
225 case ATA_PROT_DMA:
226 task->ata_task.dma_xfer = 1;
227 break;
228 }
229
230 if (qc->scsicmd)
231 ASSIGN_SAS_TASK(qc->scsicmd, task);
232
233 if (sas_ha->lldd_max_execute_num < 2)
234 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
235 else
236 res = sas_queue_up(task);
237
238 /* Examine */
239 if (res) {
240 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
241
242 if (qc->scsicmd)
243 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
244 sas_free_task(task);
245 return AC_ERR_SYSTEM;
246 }
247
248 return 0;
249}
250
251static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
252{
253 struct domain_device *dev = qc->ap->private_data;
254
255 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
256 return true;
257}
258
259static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
260 unsigned long deadline)
261{
262 struct ata_port *ap = link->ap;
263 struct domain_device *dev = ap->private_data;
264 struct sas_internal *i =
265 to_sas_internal(dev->port->ha->core.shost->transportt);
266 int res = TMF_RESP_FUNC_FAILED;
267 int ret = 0;
268
269 if (i->dft->lldd_I_T_nexus_reset)
270 res = i->dft->lldd_I_T_nexus_reset(dev);
271
272 if (res != TMF_RESP_FUNC_COMPLETE) {
273 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
274 ret = -EAGAIN;
275 }
276
277 switch (dev->sata_dev.command_set) {
278 case ATA_COMMAND_SET:
279 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
280 *class = ATA_DEV_ATA;
281 break;
282 case ATAPI_COMMAND_SET:
283 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
284 *class = ATA_DEV_ATAPI;
285 break;
286 default:
287 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
288 __func__,
289 dev->sata_dev.command_set);
290 *class = ATA_DEV_UNKNOWN;
291 break;
292 }
293
294 ap->cbl = ATA_CBL_SATA;
295 return ret;
296}
297
298static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
299 unsigned long deadline)
300{
301 struct ata_port *ap = link->ap;
302 struct domain_device *dev = ap->private_data;
303 struct sas_internal *i =
304 to_sas_internal(dev->port->ha->core.shost->transportt);
305 int res = TMF_RESP_FUNC_FAILED;
306 int ret = 0;
307
308 if (i->dft->lldd_ata_soft_reset)
309 res = i->dft->lldd_ata_soft_reset(dev);
310
311 if (res != TMF_RESP_FUNC_COMPLETE) {
312 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
313 ret = -EAGAIN;
314 }
315
316 switch (dev->sata_dev.command_set) {
317 case ATA_COMMAND_SET:
318 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
319 *class = ATA_DEV_ATA;
320 break;
321 case ATAPI_COMMAND_SET:
322 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
323 *class = ATA_DEV_ATAPI;
324 break;
325 default:
326 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
327 __func__, dev->sata_dev.command_set);
328 *class = ATA_DEV_UNKNOWN;
329 break;
330 }
331
332 ap->cbl = ATA_CBL_SATA;
333 return ret;
334}
335
336static void sas_ata_post_internal(struct ata_queued_cmd *qc)
337{
338 if (qc->flags & ATA_QCFLAG_FAILED)
339 qc->err_mask |= AC_ERR_OTHER;
340
341 if (qc->err_mask) {
342 /*
343 * Find the sas_task and kill it. By this point,
344 * libata has decided to kill the qc, so we needn't
345 * bother with sas_ata_task_done. But we still
346 * ought to abort the task.
347 */
348 struct sas_task *task = qc->lldd_task;
349 unsigned long flags;
350
351 qc->lldd_task = NULL;
352 if (task) {
353 /* Should this be a AT(API) device reset? */
354 spin_lock_irqsave(&task->task_state_lock, flags);
355 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
356 spin_unlock_irqrestore(&task->task_state_lock, flags);
357
358 task->uldd_task = NULL;
359 __sas_task_abort(task);
360 }
361 }
362}
363
364static struct ata_port_operations sas_sata_ops = {
365 .prereset = ata_std_prereset,
366 .softreset = sas_ata_soft_reset,
367 .hardreset = sas_ata_hard_reset,
368 .postreset = ata_std_postreset,
369 .error_handler = ata_std_error_handler,
370 .post_internal_cmd = sas_ata_post_internal,
371 .qc_defer = ata_std_qc_defer,
372 .qc_prep = ata_noop_qc_prep,
373 .qc_issue = sas_ata_qc_issue,
374 .qc_fill_rtf = sas_ata_qc_fill_rtf,
375 .port_start = ata_sas_port_start,
376 .port_stop = ata_sas_port_stop,
377};
378
379static struct ata_port_info sata_port_info = {
380 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
381 .pio_mask = ATA_PIO4,
382 .mwdma_mask = ATA_MWDMA2,
383 .udma_mask = ATA_UDMA6,
384 .port_ops = &sas_sata_ops
385};
386
387int sas_ata_init_host_and_port(struct domain_device *found_dev,
388 struct scsi_target *starget)
389{
390 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
391 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
392 struct ata_port *ap;
393
394 ata_host_init(&found_dev->sata_dev.ata_host,
395 ha->dev,
396 sata_port_info.flags,
397 &sas_sata_ops);
398 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
399 &sata_port_info,
400 shost);
401 if (!ap) {
402 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
403 return -ENODEV;
404 }
405
406 ap->private_data = found_dev;
407 ap->cbl = ATA_CBL_SATA;
408 ap->scsi_host = shost;
409 found_dev->sata_dev.ap = ap;
410
411 return 0;
412}
413
414void sas_ata_task_abort(struct sas_task *task)
415{
416 struct ata_queued_cmd *qc = task->uldd_task;
417 struct completion *waiting;
418
419 /* Bounce SCSI-initiated commands to the SCSI EH */
420 if (qc->scsicmd) {
421 struct request_queue *q = qc->scsicmd->device->request_queue;
422 unsigned long flags;
423
424 spin_lock_irqsave(q->queue_lock, flags);
425 blk_abort_request(qc->scsicmd->request);
426 spin_unlock_irqrestore(q->queue_lock, flags);
427 scsi_schedule_eh(qc->scsicmd->device->host);
428 return;
429 }
430
431 /* Internal command, fake a timeout and complete. */
432 qc->flags &= ~ATA_QCFLAG_ACTIVE;
433 qc->flags |= ATA_QCFLAG_FAILED;
434 qc->err_mask |= AC_ERR_TIMEOUT;
435 waiting = qc->private_data;
436 complete(waiting);
437}
438
439static void sas_task_timedout(unsigned long _task)
440{
441 struct sas_task *task = (void *) _task;
442 unsigned long flags;
443
444 spin_lock_irqsave(&task->task_state_lock, flags);
445 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
446 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
447 spin_unlock_irqrestore(&task->task_state_lock, flags);
448
449 complete(&task->completion);
450}
451
452static void sas_disc_task_done(struct sas_task *task)
453{
454 if (!del_timer(&task->timer))
455 return;
456 complete(&task->completion);
457}
458
459#define SAS_DEV_TIMEOUT 10
460
461/**
462 * sas_execute_task -- Basic task processing for discovery
463 * @task: the task to be executed
464 * @buffer: pointer to buffer to do I/O
465 * @size: size of @buffer
466 * @dma_dir: DMA direction. DMA_xxx
467 */
468static int sas_execute_task(struct sas_task *task, void *buffer, int size,
469 enum dma_data_direction dma_dir)
470{
471 int res = 0;
472 struct scatterlist *scatter = NULL;
473 struct task_status_struct *ts = &task->task_status;
474 int num_scatter = 0;
475 int retries = 0;
476 struct sas_internal *i =
477 to_sas_internal(task->dev->port->ha->core.shost->transportt);
478
479 if (dma_dir != DMA_NONE) {
480 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
481 if (!scatter)
482 goto out;
483
484 sg_init_one(scatter, buffer, size);
485 num_scatter = 1;
486 }
487
488 task->task_proto = task->dev->tproto;
489 task->scatter = scatter;
490 task->num_scatter = num_scatter;
491 task->total_xfer_len = size;
492 task->data_dir = dma_dir;
493 task->task_done = sas_disc_task_done;
494 if (dma_dir != DMA_NONE &&
495 sas_protocol_ata(task->task_proto)) {
496 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
497 task->scatter,
498 task->num_scatter,
499 task->data_dir);
500 }
501
502 for (retries = 0; retries < 5; retries++) {
503 task->task_state_flags = SAS_TASK_STATE_PENDING;
504 init_completion(&task->completion);
505
506 task->timer.data = (unsigned long) task;
507 task->timer.function = sas_task_timedout;
508 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
509 add_timer(&task->timer);
510
511 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
512 if (res) {
513 del_timer(&task->timer);
514 SAS_DPRINTK("executing SAS discovery task failed:%d\n",
515 res);
516 goto ex_err;
517 }
518 wait_for_completion(&task->completion);
519 res = -ECOMM;
520 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
521 int res2;
522 SAS_DPRINTK("task aborted, flags:0x%x\n",
523 task->task_state_flags);
524 res2 = i->dft->lldd_abort_task(task);
525 SAS_DPRINTK("came back from abort task\n");
526 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
527 if (res2 == TMF_RESP_FUNC_COMPLETE)
528 continue; /* Retry the task */
529 else
530 goto ex_err;
531 }
532 }
533 if (task->task_status.stat == SAM_STAT_BUSY ||
534 task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
535 task->task_status.stat == SAS_QUEUE_FULL) {
536 SAS_DPRINTK("task: q busy, sleeping...\n");
537 schedule_timeout_interruptible(HZ);
538 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
539 struct scsi_sense_hdr shdr;
540
541 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
542 &shdr)) {
543 SAS_DPRINTK("couldn't normalize sense\n");
544 continue;
545 }
546 if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
547 (shdr.sense_key == 2 && shdr.asc == 4 &&
548 shdr.ascq == 1)) {
549 SAS_DPRINTK("device %016llx LUN: %016llx "
550 "powering up or not ready yet, "
551 "sleeping...\n",
552 SAS_ADDR(task->dev->sas_addr),
553 SAS_ADDR(task->ssp_task.LUN));
554
555 schedule_timeout_interruptible(5*HZ);
556 } else if (shdr.sense_key == 1) {
557 res = 0;
558 break;
559 } else if (shdr.sense_key == 5) {
560 break;
561 } else {
562 SAS_DPRINTK("dev %016llx LUN: %016llx "
563 "sense key:0x%x ASC:0x%x ASCQ:0x%x"
564 "\n",
565 SAS_ADDR(task->dev->sas_addr),
566 SAS_ADDR(task->ssp_task.LUN),
567 shdr.sense_key,
568 shdr.asc, shdr.ascq);
569 }
570 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
571 task->task_status.stat != SAM_STAT_GOOD) {
572 SAS_DPRINTK("task finished with resp:0x%x, "
573 "stat:0x%x\n",
574 task->task_status.resp,
575 task->task_status.stat);
576 goto ex_err;
577 } else {
578 res = 0;
579 break;
580 }
581 }
582ex_err:
583 if (dma_dir != DMA_NONE) {
584 if (sas_protocol_ata(task->task_proto))
585 dma_unmap_sg(task->dev->port->ha->dev,
586 task->scatter, task->num_scatter,
587 task->data_dir);
588 kfree(scatter);
589 }
590out:
591 return res;
592}
593
594/* ---------- SATA ---------- */
595
596static void sas_get_ata_command_set(struct domain_device *dev)
597{
598 struct dev_to_host_fis *fis =
599 (struct dev_to_host_fis *) dev->frame_rcvd;
600
601 if ((fis->sector_count == 1 && /* ATA */
602 fis->lbal == 1 &&
603 fis->lbam == 0 &&
604 fis->lbah == 0 &&
605 fis->device == 0)
606 ||
607 (fis->sector_count == 0 && /* CE-ATA (mATA) */
608 fis->lbal == 0 &&
609 fis->lbam == 0xCE &&
610 fis->lbah == 0xAA &&
611 (fis->device & ~0x10) == 0))
612
613 dev->sata_dev.command_set = ATA_COMMAND_SET;
614
615 else if ((fis->interrupt_reason == 1 && /* ATAPI */
616 fis->lbal == 1 &&
617 fis->byte_count_low == 0x14 &&
618 fis->byte_count_high == 0xEB &&
619 (fis->device & ~0x10) == 0))
620
621 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
622
623 else if ((fis->sector_count == 1 && /* SEMB */
624 fis->lbal == 1 &&
625 fis->lbam == 0x3C &&
626 fis->lbah == 0xC3 &&
627 fis->device == 0)
628 ||
629 (fis->interrupt_reason == 1 && /* SATA PM */
630 fis->lbal == 1 &&
631 fis->byte_count_low == 0x69 &&
632 fis->byte_count_high == 0x96 &&
633 (fis->device & ~0x10) == 0))
634
635 /* Treat it as a superset? */
636 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
637}
638
639/**
640 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
641 * @dev: the device to send the command to
642 * @command: the command register
643 * @features: the features register
644 * @buffer: pointer to buffer to do I/O
645 * @size: size of @buffer
646 * @dma_dir: DMA direction. DMA_xxx
647 */
648static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
649 u8 features, void *buffer, int size,
650 enum dma_data_direction dma_dir)
651{
652 int res = 0;
653 struct sas_task *task;
654 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
655 &dev->frame_rcvd[0];
656
657 res = -ENOMEM;
658 task = sas_alloc_task(GFP_KERNEL);
659 if (!task)
660 goto out;
661
662 task->dev = dev;
663
664 task->ata_task.fis.fis_type = 0x27;
665 task->ata_task.fis.command = command;
666 task->ata_task.fis.features = features;
667 task->ata_task.fis.device = d2h_fis->device;
668 task->ata_task.retry_count = 1;
669
670 res = sas_execute_task(task, buffer, size, dma_dir);
671
672 sas_free_task(task);
673out:
674 return res;
675}
676
677#define ATA_IDENTIFY_DEV 0xEC
678#define ATA_IDENTIFY_PACKET_DEV 0xA1
679#define ATA_SET_FEATURES 0xEF
680#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
681
682/**
683 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
684 * @dev: STP/SATA device of interest (ATA/ATAPI)
685 *
686 * The LLDD has already been notified of this device, so that we can
687 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
688 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
689 * performance for this device.
690 */
691static int sas_discover_sata_dev(struct domain_device *dev)
692{
693 int res;
694 __le16 *identify_x;
695 u8 command;
696
697 identify_x = kzalloc(512, GFP_KERNEL);
698 if (!identify_x)
699 return -ENOMEM;
700
701 if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
702 dev->sata_dev.identify_device = identify_x;
703 command = ATA_IDENTIFY_DEV;
704 } else {
705 dev->sata_dev.identify_packet_device = identify_x;
706 command = ATA_IDENTIFY_PACKET_DEV;
707 }
708
709 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
710 DMA_FROM_DEVICE);
711 if (res)
712 goto out_err;
713
714 /* lives on the media? */
715 if (le16_to_cpu(identify_x[0]) & 4) {
716 /* incomplete response */
717 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
718 "dev %llx\n", SAS_ADDR(dev->sas_addr));
719 if (!(identify_x[83] & cpu_to_le16(1<<6)))
720 goto cont1;
721 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
722 ATA_FEATURE_PUP_STBY_SPIN_UP,
723 NULL, 0, DMA_NONE);
724 if (res)
725 goto cont1;
726
727 schedule_timeout_interruptible(5*HZ); /* More time? */
728 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
729 DMA_FROM_DEVICE);
730 if (res)
731 goto out_err;
732 }
733cont1:
734 /* XXX Hint: register this SATA device with SATL.
735 When this returns, dev->sata_dev->lu is alive and
736 present.
737 sas_satl_register_dev(dev);
738 */
739
740 sas_fill_in_rphy(dev, dev->rphy);
741
742 return 0;
743out_err:
744 dev->sata_dev.identify_packet_device = NULL;
745 dev->sata_dev.identify_device = NULL;
746 kfree(identify_x);
747 return res;
748}
749
750static int sas_discover_sata_pm(struct domain_device *dev)
751{
752 return -ENODEV;
753}
754
755/**
756 * sas_discover_sata -- discover an STP/SATA domain device
757 * @dev: pointer to struct domain_device of interest
758 *
759 * First we notify the LLDD of this device, so we can send frames to
760 * it. Then depending on the type of device we call the appropriate
761 * discover functions. Once device discover is done, we notify the
762 * LLDD so that it can fine-tune its parameters for the device, by
763 * removing it and then adding it. That is, the second time around,
764 * the driver would have certain fields, that it is looking at, set.
765 * Finally we initialize the kobj so that the device can be added to
766 * the system at registration time. Devices directly attached to a HA
767 * port, have no parents. All other devices do, and should have their
768 * "parent" pointer set appropriately before calling this function.
769 */
770int sas_discover_sata(struct domain_device *dev)
771{
772 int res;
773
774 sas_get_ata_command_set(dev);
775
776 res = sas_notify_lldd_dev_found(dev);
777 if (res)
778 return res;
779
780 switch (dev->dev_type) {
781 case SATA_DEV:
782 res = sas_discover_sata_dev(dev);
783 break;
784 case SATA_PM:
785 res = sas_discover_sata_pm(dev);
786 break;
787 default:
788 break;
789 }
790 sas_notify_lldd_dev_gone(dev);
791 if (!res) {
792 sas_notify_lldd_dev_found(dev);
793 res = sas_rphy_add(dev->rphy);
794 }
795
796 return res;
797}
798
799void sas_ata_strategy_handler(struct Scsi_Host *shost)
800{
801 struct scsi_device *sdev;
802
803 shost_for_each_device(sdev, shost) {
804 struct domain_device *ddev = sdev_to_domain_dev(sdev);
805 struct ata_port *ap = ddev->sata_dev.ap;
806
807 if (!dev_is_sata(ddev))
808 continue;
809
810 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
811 ata_scsi_port_error_handler(shost, ap);
812 }
813}
814
815int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
816 enum blk_eh_timer_return *rtn)
817{
818 struct domain_device *ddev = cmd_to_domain_dev(cmd);
819
820 if (!dev_is_sata(ddev) || task)
821 return 0;
822
823 /* we're a sata device with no task, so this must be a libata
824 * eh timeout. Ideally should hook into libata timeout
825 * handling, but there's no point, it just wants to activate
826 * the eh thread */
827 *rtn = BLK_EH_NOT_HANDLED;
828 return 1;
829}
830
831int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
832 struct list_head *done_q)
833{
834 int rtn = 0;
835 struct scsi_cmnd *cmd, *n;
836 struct ata_port *ap;
837
838 do {
839 LIST_HEAD(sata_q);
840
841 ap = NULL;
842
843 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
844 struct domain_device *ddev = cmd_to_domain_dev(cmd);
845
846 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
847 continue;
848 if (ap && ap != ddev->sata_dev.ap)
849 continue;
850 ap = ddev->sata_dev.ap;
851 rtn = 1;
852 list_move(&cmd->eh_entry, &sata_q);
853 }
854
855 if (!list_empty(&sata_q)) {
856 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
857 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
858 /*
859 * ata's error handler may leave the cmd on the list
860 * so make sure they don't remain on a stack list
861 * about to go out of scope.
862 *
863 * This looks strange, since the commands are
864 * now part of no list, but the next error
865 * action will be ata_port_error_handler()
866 * which takes no list and sweeps them up
867 * anyway from the ata tag array.
868 */
869 while (!list_empty(&sata_q))
870 list_del_init(sata_q.next);
871 }
872 } while (ap);
873
874 return rtn;
875}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 *
5 * Copyright (C) 2006 IBM Corporation
6 *
7 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
8 */
9
10#include <linux/scatterlist.h>
11#include <linux/slab.h>
12#include <linux/async.h>
13#include <linux/export.h>
14
15#include <scsi/sas_ata.h>
16#include "sas_internal.h"
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_transport.h>
22#include <scsi/scsi_transport_sas.h>
23#include "scsi_sas_internal.h"
24#include "scsi_transport_api.h"
25#include <scsi/scsi_eh.h>
26
27static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
28{
29 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
30
31 /* transport error */
32 if (ts->resp == SAS_TASK_UNDELIVERED)
33 return AC_ERR_ATA_BUS;
34
35 /* ts->resp == SAS_TASK_COMPLETE */
36 /* task delivered, what happened afterwards? */
37 switch (ts->stat) {
38 case SAS_DEV_NO_RESPONSE:
39 return AC_ERR_TIMEOUT;
40 case SAS_INTERRUPTED:
41 case SAS_PHY_DOWN:
42 case SAS_NAK_R_ERR:
43 return AC_ERR_ATA_BUS;
44 case SAS_DATA_UNDERRUN:
45 /*
46 * Some programs that use the taskfile interface
47 * (smartctl in particular) can cause underrun
48 * problems. Ignore these errors, perhaps at our
49 * peril.
50 */
51 return 0;
52 case SAS_DATA_OVERRUN:
53 case SAS_QUEUE_FULL:
54 case SAS_DEVICE_UNKNOWN:
55 case SAS_OPEN_TO:
56 case SAS_OPEN_REJECT:
57 pr_warn("%s: Saw error %d. What to do?\n",
58 __func__, ts->stat);
59 return AC_ERR_OTHER;
60 case SAM_STAT_CHECK_CONDITION:
61 case SAS_ABORTED_TASK:
62 return AC_ERR_DEV;
63 case SAS_PROTO_RESPONSE:
64 /* This means the ending_fis has the error
65 * value; return 0 here to collect it
66 */
67 return 0;
68 default:
69 return 0;
70 }
71}
72
73static void sas_ata_task_done(struct sas_task *task)
74{
75 struct ata_queued_cmd *qc = task->uldd_task;
76 struct domain_device *dev = task->dev;
77 struct task_status_struct *stat = &task->task_status;
78 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
79 struct sas_ha_struct *sas_ha = dev->port->ha;
80 enum ata_completion_errors ac;
81 unsigned long flags;
82 struct ata_link *link;
83 struct ata_port *ap;
84
85 spin_lock_irqsave(&dev->done_lock, flags);
86 if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
87 task = NULL;
88 else if (qc && qc->scsicmd)
89 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
90 spin_unlock_irqrestore(&dev->done_lock, flags);
91
92 /* check if libsas-eh got to the task before us */
93 if (unlikely(!task))
94 return;
95
96 if (!qc)
97 goto qc_already_gone;
98
99 ap = qc->ap;
100 link = &ap->link;
101
102 spin_lock_irqsave(ap->lock, flags);
103 /* check if we lost the race with libata/sas_ata_post_internal() */
104 if (unlikely(ata_port_is_frozen(ap))) {
105 spin_unlock_irqrestore(ap->lock, flags);
106 if (qc->scsicmd)
107 goto qc_already_gone;
108 else {
109 /* if eh is not involved and the port is frozen then the
110 * ata internal abort process has taken responsibility
111 * for this sas_task
112 */
113 return;
114 }
115 }
116
117 if (stat->stat == SAS_PROTO_RESPONSE ||
118 stat->stat == SAS_SAM_STAT_GOOD ||
119 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
120 dev->sata_dev.class == ATA_DEV_ATAPI)) {
121 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
122
123 if (!link->sactive) {
124 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
125 } else {
126 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
127 if (unlikely(link->eh_info.err_mask))
128 qc->flags |= ATA_QCFLAG_EH;
129 }
130 } else {
131 ac = sas_to_ata_err(stat);
132 if (ac) {
133 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
134 /* We saw a SAS error. Send a vague error. */
135 if (!link->sactive) {
136 qc->err_mask = ac;
137 } else {
138 link->eh_info.err_mask |= AC_ERR_DEV;
139 qc->flags |= ATA_QCFLAG_EH;
140 }
141
142 dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
143 dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
144 }
145 }
146
147 qc->lldd_task = NULL;
148 ata_qc_complete(qc);
149 spin_unlock_irqrestore(ap->lock, flags);
150
151qc_already_gone:
152 sas_free_task(task);
153}
154
155static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
156 __must_hold(ap->lock)
157{
158 struct sas_task *task;
159 struct scatterlist *sg;
160 int ret = AC_ERR_SYSTEM;
161 unsigned int si, xfer = 0;
162 struct ata_port *ap = qc->ap;
163 struct domain_device *dev = ap->private_data;
164 struct sas_ha_struct *sas_ha = dev->port->ha;
165 struct Scsi_Host *host = sas_ha->shost;
166 struct sas_internal *i = to_sas_internal(host->transportt);
167
168 /* TODO: we should try to remove that unlock */
169 spin_unlock(ap->lock);
170
171 /* If the device fell off, no sense in issuing commands */
172 if (test_bit(SAS_DEV_GONE, &dev->state))
173 goto out;
174
175 task = sas_alloc_task(GFP_ATOMIC);
176 if (!task)
177 goto out;
178 task->dev = dev;
179 task->task_proto = SAS_PROTOCOL_STP;
180 task->task_done = sas_ata_task_done;
181
182 /* For NCQ commands, zero out the tag libata assigned us */
183 if (ata_is_ncq(qc->tf.protocol))
184 qc->tf.nsect = 0;
185
186 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
187 task->uldd_task = qc;
188 if (ata_is_atapi(qc->tf.protocol)) {
189 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
190 task->total_xfer_len = qc->nbytes;
191 task->num_scatter = qc->n_elem;
192 task->data_dir = qc->dma_dir;
193 } else if (!ata_is_data(qc->tf.protocol)) {
194 task->data_dir = DMA_NONE;
195 } else {
196 for_each_sg(qc->sg, sg, qc->n_elem, si)
197 xfer += sg_dma_len(sg);
198
199 task->total_xfer_len = xfer;
200 task->num_scatter = si;
201 task->data_dir = qc->dma_dir;
202 }
203 task->scatter = qc->sg;
204 qc->lldd_task = task;
205
206 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
207 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
208
209 if (qc->flags & ATA_QCFLAG_RESULT_TF)
210 task->ata_task.return_fis_on_success = 1;
211
212 if (qc->scsicmd)
213 ASSIGN_SAS_TASK(qc->scsicmd, task);
214
215 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
216 if (ret) {
217 pr_debug("lldd_execute_task returned: %d\n", ret);
218
219 if (qc->scsicmd)
220 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
221 sas_free_task(task);
222 qc->lldd_task = NULL;
223 ret = AC_ERR_SYSTEM;
224 }
225
226 out:
227 spin_lock(ap->lock);
228 return ret;
229}
230
231static void sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
232{
233 struct domain_device *dev = qc->ap->private_data;
234
235 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
236}
237
238static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
239{
240 return to_sas_internal(dev->port->ha->shost->transportt);
241}
242
243static int sas_get_ata_command_set(struct domain_device *dev)
244{
245 struct ata_taskfile tf;
246
247 if (dev->dev_type == SAS_SATA_PENDING)
248 return ATA_DEV_UNKNOWN;
249
250 ata_tf_from_fis(dev->frame_rcvd, &tf);
251
252 return ata_dev_classify(&tf);
253}
254
255int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
256{
257 if (phy->attached_tproto & SAS_PROTOCOL_STP)
258 dev->tproto = phy->attached_tproto;
259 if (phy->attached_sata_dev)
260 dev->tproto |= SAS_SATA_DEV;
261
262 if (phy->attached_dev_type == SAS_SATA_PENDING)
263 dev->dev_type = SAS_SATA_PENDING;
264 else {
265 int res;
266
267 dev->dev_type = SAS_SATA_DEV;
268 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
269 &dev->sata_dev.rps_resp);
270 if (res) {
271 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
272 SAS_ADDR(dev->parent->sas_addr),
273 phy->phy_id, res);
274 return res;
275 }
276 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
277 sizeof(struct dev_to_host_fis));
278 dev->sata_dev.class = sas_get_ata_command_set(dev);
279 }
280 return 0;
281}
282
283static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
284{
285 int res;
286
287 /* we weren't pending, so successfully end the reset sequence now */
288 if (dev->dev_type != SAS_SATA_PENDING)
289 return 1;
290
291 /* hmmm, if this succeeds do we need to repost the domain_device to the
292 * lldd so it can pick up new parameters?
293 */
294 res = sas_get_ata_info(dev, phy);
295 if (res)
296 return 0; /* retry */
297 else
298 return 1;
299}
300
301int smp_ata_check_ready_type(struct ata_link *link)
302{
303 struct domain_device *dev = link->ap->private_data;
304 struct sas_phy *phy = sas_get_local_phy(dev);
305 struct domain_device *ex_dev = dev->parent;
306 enum sas_device_type type = SAS_PHY_UNUSED;
307 u8 sas_addr[SAS_ADDR_SIZE];
308 int res;
309
310 res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
311 sas_put_local_phy(phy);
312 if (res)
313 return res;
314
315 switch (type) {
316 case SAS_SATA_PENDING:
317 return 0;
318 case SAS_END_DEVICE:
319 return 1;
320 default:
321 return -ENODEV;
322 }
323}
324EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
325
326static int smp_ata_check_ready(struct ata_link *link)
327{
328 int res;
329 struct ata_port *ap = link->ap;
330 struct domain_device *dev = ap->private_data;
331 struct domain_device *ex_dev = dev->parent;
332 struct sas_phy *phy = sas_get_local_phy(dev);
333 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
334
335 res = sas_ex_phy_discover(ex_dev, phy->number);
336 sas_put_local_phy(phy);
337
338 /* break the wait early if the expander is unreachable,
339 * otherwise keep polling
340 */
341 if (res == -ECOMM)
342 return res;
343 if (res != SMP_RESP_FUNC_ACC)
344 return 0;
345
346 switch (ex_phy->attached_dev_type) {
347 case SAS_SATA_PENDING:
348 return 0;
349 case SAS_END_DEVICE:
350 if (ex_phy->attached_sata_dev)
351 return sas_ata_clear_pending(dev, ex_phy);
352 fallthrough;
353 default:
354 return -ENODEV;
355 }
356}
357
358static int local_ata_check_ready(struct ata_link *link)
359{
360 struct ata_port *ap = link->ap;
361 struct domain_device *dev = ap->private_data;
362 struct sas_internal *i = dev_to_sas_internal(dev);
363
364 if (i->dft->lldd_ata_check_ready)
365 return i->dft->lldd_ata_check_ready(dev);
366 else {
367 /* lldd's that don't implement 'ready' checking get the
368 * old default behavior of not coordinating reset
369 * recovery with libata
370 */
371 return 1;
372 }
373}
374
375static int sas_ata_printk(const char *level, const struct domain_device *ddev,
376 const char *fmt, ...)
377{
378 struct ata_port *ap = ddev->sata_dev.ap;
379 struct device *dev = &ddev->rphy->dev;
380 struct va_format vaf;
381 va_list args;
382 int r;
383
384 va_start(args, fmt);
385
386 vaf.fmt = fmt;
387 vaf.va = &args;
388
389 r = printk("%s" SAS_FMT "ata%u: %s: %pV",
390 level, ap->print_id, dev_name(dev), &vaf);
391
392 va_end(args);
393
394 return r;
395}
396
397static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
398{
399 struct sata_device *sata_dev = &dev->sata_dev;
400 int (*check_ready)(struct ata_link *link);
401 struct ata_port *ap = sata_dev->ap;
402 struct ata_link *link = &ap->link;
403 struct sas_phy *phy;
404 int ret;
405
406 phy = sas_get_local_phy(dev);
407 if (scsi_is_sas_phy_local(phy))
408 check_ready = local_ata_check_ready;
409 else
410 check_ready = smp_ata_check_ready;
411 sas_put_local_phy(phy);
412
413 ret = ata_wait_after_reset(link, deadline, check_ready);
414 if (ret && ret != -EAGAIN)
415 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
416
417 return ret;
418}
419
420static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
421 unsigned long deadline)
422{
423 struct ata_port *ap = link->ap;
424 struct domain_device *dev = ap->private_data;
425 struct sas_internal *i = dev_to_sas_internal(dev);
426 int ret;
427
428 ret = i->dft->lldd_I_T_nexus_reset(dev);
429 if (ret == -ENODEV)
430 return ret;
431
432 if (ret != TMF_RESP_FUNC_COMPLETE)
433 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
434
435 ret = sas_ata_wait_after_reset(dev, deadline);
436
437 *class = dev->sata_dev.class;
438
439 ap->cbl = ATA_CBL_SATA;
440 return ret;
441}
442
443/*
444 * notify the lldd to forget the sas_task for this internal ata command
445 * that bypasses scsi-eh
446 */
447static void sas_ata_internal_abort(struct sas_task *task)
448{
449 struct sas_internal *si = dev_to_sas_internal(task->dev);
450 unsigned long flags;
451 int res;
452
453 spin_lock_irqsave(&task->task_state_lock, flags);
454 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
455 task->task_state_flags & SAS_TASK_STATE_DONE) {
456 spin_unlock_irqrestore(&task->task_state_lock, flags);
457 pr_debug("%s: Task %p already finished.\n", __func__, task);
458 goto out;
459 }
460 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
461 spin_unlock_irqrestore(&task->task_state_lock, flags);
462
463 res = si->dft->lldd_abort_task(task);
464
465 spin_lock_irqsave(&task->task_state_lock, flags);
466 if (task->task_state_flags & SAS_TASK_STATE_DONE ||
467 res == TMF_RESP_FUNC_COMPLETE) {
468 spin_unlock_irqrestore(&task->task_state_lock, flags);
469 goto out;
470 }
471
472 /* XXX we are not prepared to deal with ->lldd_abort_task()
473 * failures. TODO: lldds need to unconditionally forget about
474 * aborted ata tasks, otherwise we (likely) leak the sas task
475 * here
476 */
477 pr_warn("%s: Task %p leaked.\n", __func__, task);
478
479 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
480 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
481 spin_unlock_irqrestore(&task->task_state_lock, flags);
482
483 return;
484 out:
485 sas_free_task(task);
486}
487
488static void sas_ata_post_internal(struct ata_queued_cmd *qc)
489{
490 if (qc->flags & ATA_QCFLAG_EH)
491 qc->err_mask |= AC_ERR_OTHER;
492
493 if (qc->err_mask) {
494 /*
495 * Find the sas_task and kill it. By this point, libata
496 * has decided to kill the qc and has frozen the port.
497 * In this state sas_ata_task_done() will no longer free
498 * the sas_task, so we need to notify the lldd (via
499 * ->lldd_abort_task) that the task is dead and free it
500 * ourselves.
501 */
502 struct sas_task *task = qc->lldd_task;
503
504 qc->lldd_task = NULL;
505 if (!task)
506 return;
507 task->uldd_task = NULL;
508 sas_ata_internal_abort(task);
509 }
510}
511
512
513static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
514{
515 struct domain_device *dev = ap->private_data;
516 struct sas_internal *i = dev_to_sas_internal(dev);
517
518 if (i->dft->lldd_ata_set_dmamode)
519 i->dft->lldd_ata_set_dmamode(dev);
520}
521
522static void sas_ata_sched_eh(struct ata_port *ap)
523{
524 struct domain_device *dev = ap->private_data;
525 struct sas_ha_struct *ha = dev->port->ha;
526 unsigned long flags;
527
528 spin_lock_irqsave(&ha->lock, flags);
529 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
530 ha->eh_active++;
531 ata_std_sched_eh(ap);
532 spin_unlock_irqrestore(&ha->lock, flags);
533}
534
535void sas_ata_end_eh(struct ata_port *ap)
536{
537 struct domain_device *dev = ap->private_data;
538 struct sas_ha_struct *ha = dev->port->ha;
539 unsigned long flags;
540
541 spin_lock_irqsave(&ha->lock, flags);
542 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
543 ha->eh_active--;
544 spin_unlock_irqrestore(&ha->lock, flags);
545}
546
547static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
548{
549 struct ata_port *ap = link->ap;
550 struct domain_device *dev = ap->private_data;
551 struct sas_phy *local_phy = sas_get_local_phy(dev);
552 int res = 0;
553
554 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
555 res = -ENOENT;
556 sas_put_local_phy(local_phy);
557
558 return res;
559}
560
561static struct ata_port_operations sas_sata_ops = {
562 .prereset = sas_ata_prereset,
563 .hardreset = sas_ata_hard_reset,
564 .error_handler = ata_std_error_handler,
565 .post_internal_cmd = sas_ata_post_internal,
566 .qc_defer = ata_std_qc_defer,
567 .qc_issue = sas_ata_qc_issue,
568 .qc_fill_rtf = sas_ata_qc_fill_rtf,
569 .set_dmamode = sas_ata_set_dmamode,
570 .sched_eh = sas_ata_sched_eh,
571 .end_eh = sas_ata_end_eh,
572};
573
574int sas_ata_init(struct domain_device *found_dev)
575{
576 struct sas_ha_struct *ha = found_dev->port->ha;
577 struct Scsi_Host *shost = ha->shost;
578 struct ata_host *ata_host;
579 struct ata_port *ap;
580 int rc;
581
582 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
583 if (!ata_host) {
584 pr_err("ata host alloc failed.\n");
585 return -ENOMEM;
586 }
587
588 ata_host_init(ata_host, ha->dev, &sas_sata_ops);
589
590 ap = ata_port_alloc(ata_host);
591 if (!ap) {
592 pr_err("ata_port_alloc failed.\n");
593 rc = -ENODEV;
594 goto free_host;
595 }
596
597 ap->port_no = 0;
598 ap->pio_mask = ATA_PIO4;
599 ap->mwdma_mask = ATA_MWDMA2;
600 ap->udma_mask = ATA_UDMA6;
601 ap->flags |= ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
602 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX;
603 ap->ops = &sas_sata_ops;
604 ap->private_data = found_dev;
605 ap->cbl = ATA_CBL_SATA;
606 ap->scsi_host = shost;
607
608 rc = ata_tport_add(ata_host->dev, ap);
609 if (rc)
610 goto free_port;
611
612 found_dev->sata_dev.ata_host = ata_host;
613 found_dev->sata_dev.ap = ap;
614
615 return 0;
616
617free_port:
618 ata_port_free(ap);
619free_host:
620 ata_host_put(ata_host);
621 return rc;
622}
623
624void sas_ata_task_abort(struct sas_task *task)
625{
626 struct ata_queued_cmd *qc = task->uldd_task;
627 struct completion *waiting;
628
629 /* Bounce SCSI-initiated commands to the SCSI EH */
630 if (qc->scsicmd) {
631 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
632 return;
633 }
634
635 /* Internal command, fake a timeout and complete. */
636 qc->flags &= ~ATA_QCFLAG_ACTIVE;
637 qc->flags |= ATA_QCFLAG_EH;
638 qc->err_mask |= AC_ERR_TIMEOUT;
639 waiting = qc->private_data;
640 complete(waiting);
641}
642
643void sas_probe_sata(struct asd_sas_port *port)
644{
645 struct domain_device *dev, *n;
646
647 mutex_lock(&port->ha->disco_mutex);
648 list_for_each_entry(dev, &port->disco_list, disco_list_node) {
649 if (!dev_is_sata(dev))
650 continue;
651
652 ata_port_probe(dev->sata_dev.ap);
653 }
654 mutex_unlock(&port->ha->disco_mutex);
655
656 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
657 if (!dev_is_sata(dev))
658 continue;
659
660 sas_ata_wait_eh(dev);
661
662 /* if libata could not bring the link up, don't surface
663 * the device
664 */
665 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
666 sas_fail_probe(dev, __func__, -ENODEV);
667 }
668
669}
670
671int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
672 struct domain_device *child, int phy_id)
673{
674 struct sas_rphy *rphy;
675 int ret;
676
677 if (child->linkrate > parent->min_linkrate) {
678 struct sas_phy *cphy = child->phy;
679 enum sas_linkrate min_prate = cphy->minimum_linkrate,
680 parent_min_lrate = parent->min_linkrate,
681 min_linkrate = (min_prate > parent_min_lrate) ?
682 parent_min_lrate : 0;
683 struct sas_phy_linkrates rates = {
684 .maximum_linkrate = parent->min_linkrate,
685 .minimum_linkrate = min_linkrate,
686 };
687
688 pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
689 SAS_ADDR(child->sas_addr), phy_id);
690 ret = sas_smp_phy_control(parent, phy_id,
691 PHY_FUNC_LINK_RESET, &rates);
692 if (ret) {
693 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
694 SAS_ADDR(child->sas_addr), phy_id, ret);
695 return ret;
696 }
697 pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
698 SAS_ADDR(child->sas_addr), phy_id);
699 child->linkrate = child->min_linkrate;
700 }
701 ret = sas_get_ata_info(child, phy);
702 if (ret)
703 return ret;
704
705 sas_init_dev(child);
706 ret = sas_ata_init(child);
707 if (ret)
708 return ret;
709
710 rphy = sas_end_device_alloc(phy->port);
711 if (!rphy)
712 return -ENOMEM;
713
714 rphy->identify.phy_identifier = phy_id;
715 child->rphy = rphy;
716 get_device(&rphy->dev);
717
718 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
719
720 ret = sas_discover_sata(child);
721 if (ret) {
722 pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
723 SAS_ADDR(child->sas_addr),
724 SAS_ADDR(parent->sas_addr), phy_id, ret);
725 sas_rphy_free(child->rphy);
726 list_del(&child->disco_list_node);
727 return ret;
728 }
729
730 return 0;
731}
732
733static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
734{
735 struct domain_device *dev, *n;
736
737 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
738 if (!dev_is_sata(dev))
739 continue;
740
741 sas_ata_wait_eh(dev);
742
743 /* if libata failed to power manage the device, tear it down */
744 if (ata_dev_disabled(sas_to_ata_dev(dev)))
745 sas_fail_probe(dev, func, -ENODEV);
746 }
747}
748
749void sas_suspend_sata(struct asd_sas_port *port)
750{
751 struct domain_device *dev;
752
753 mutex_lock(&port->ha->disco_mutex);
754 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
755 struct sata_device *sata;
756
757 if (!dev_is_sata(dev))
758 continue;
759
760 sata = &dev->sata_dev;
761 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
762 continue;
763
764 ata_sas_port_suspend(sata->ap);
765 }
766 mutex_unlock(&port->ha->disco_mutex);
767
768 sas_ata_flush_pm_eh(port, __func__);
769}
770
771void sas_resume_sata(struct asd_sas_port *port)
772{
773 struct domain_device *dev;
774
775 mutex_lock(&port->ha->disco_mutex);
776 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
777 struct sata_device *sata;
778
779 if (!dev_is_sata(dev))
780 continue;
781
782 sata = &dev->sata_dev;
783 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
784 continue;
785
786 ata_sas_port_resume(sata->ap);
787 }
788 mutex_unlock(&port->ha->disco_mutex);
789
790 sas_ata_flush_pm_eh(port, __func__);
791}
792
793/**
794 * sas_discover_sata - discover an STP/SATA domain device
795 * @dev: pointer to struct domain_device of interest
796 *
797 * Devices directly attached to a HA port, have no parents. All other
798 * devices do, and should have their "parent" pointer set appropriately
799 * before calling this function.
800 */
801int sas_discover_sata(struct domain_device *dev)
802{
803 if (dev->dev_type == SAS_SATA_PM)
804 return -ENODEV;
805
806 dev->sata_dev.class = sas_get_ata_command_set(dev);
807 sas_fill_in_rphy(dev, dev->rphy);
808
809 return sas_notify_lldd_dev_found(dev);
810}
811
812static void async_sas_ata_eh(void *data, async_cookie_t cookie)
813{
814 struct domain_device *dev = data;
815 struct ata_port *ap = dev->sata_dev.ap;
816 struct sas_ha_struct *ha = dev->port->ha;
817
818 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
819 ata_scsi_port_error_handler(ha->shost, ap);
820 sas_put_device(dev);
821}
822
823void sas_ata_strategy_handler(struct Scsi_Host *shost)
824{
825 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
826 ASYNC_DOMAIN_EXCLUSIVE(async);
827 int i;
828
829 /* it's ok to defer revalidation events during ata eh, these
830 * disks are in one of three states:
831 * 1/ present for initial domain discovery, and these
832 * resets will cause bcn flutters
833 * 2/ hot removed, we'll discover that after eh fails
834 * 3/ hot added after initial discovery, lost the race, and need
835 * to catch the next train.
836 */
837 sas_disable_revalidation(sas_ha);
838
839 spin_lock_irq(&sas_ha->phy_port_lock);
840 for (i = 0; i < sas_ha->num_phys; i++) {
841 struct asd_sas_port *port = sas_ha->sas_port[i];
842 struct domain_device *dev;
843
844 spin_lock(&port->dev_list_lock);
845 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
846 if (!dev_is_sata(dev))
847 continue;
848
849 /* hold a reference over eh since we may be
850 * racing with final remove once all commands
851 * are completed
852 */
853 kref_get(&dev->kref);
854
855 async_schedule_domain(async_sas_ata_eh, dev, &async);
856 }
857 spin_unlock(&port->dev_list_lock);
858 }
859 spin_unlock_irq(&sas_ha->phy_port_lock);
860
861 async_synchronize_full_domain(&async);
862
863 sas_enable_revalidation(sas_ha);
864}
865
866void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
867{
868 struct scsi_cmnd *cmd, *n;
869 struct domain_device *eh_dev;
870
871 do {
872 LIST_HEAD(sata_q);
873 eh_dev = NULL;
874
875 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
876 struct domain_device *ddev = cmd_to_domain_dev(cmd);
877
878 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
879 continue;
880 if (eh_dev && eh_dev != ddev)
881 continue;
882 eh_dev = ddev;
883 list_move(&cmd->eh_entry, &sata_q);
884 }
885
886 if (!list_empty(&sata_q)) {
887 struct ata_port *ap = eh_dev->sata_dev.ap;
888
889 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
890 ata_scsi_cmd_error_handler(shost, ap, &sata_q);
891 /*
892 * ata's error handler may leave the cmd on the list
893 * so make sure they don't remain on a stack list
894 * about to go out of scope.
895 *
896 * This looks strange, since the commands are
897 * now part of no list, but the next error
898 * action will be ata_port_error_handler()
899 * which takes no list and sweeps them up
900 * anyway from the ata tag array.
901 */
902 while (!list_empty(&sata_q))
903 list_del_init(sata_q.next);
904 }
905 } while (eh_dev);
906}
907
908void sas_ata_schedule_reset(struct domain_device *dev)
909{
910 struct ata_eh_info *ehi;
911 struct ata_port *ap;
912 unsigned long flags;
913
914 if (!dev_is_sata(dev))
915 return;
916
917 ap = dev->sata_dev.ap;
918 ehi = &ap->link.eh_info;
919
920 spin_lock_irqsave(ap->lock, flags);
921 ehi->err_mask |= AC_ERR_TIMEOUT;
922 ehi->action |= ATA_EH_RESET;
923 ata_port_schedule_eh(ap);
924 spin_unlock_irqrestore(ap->lock, flags);
925}
926EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
927
928void sas_ata_wait_eh(struct domain_device *dev)
929{
930 struct ata_port *ap;
931
932 if (!dev_is_sata(dev))
933 return;
934
935 ap = dev->sata_dev.ap;
936 ata_port_wait_eh(ap);
937}
938
939void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
940{
941 struct ata_port *ap = device->sata_dev.ap;
942 struct ata_link *link = &ap->link;
943 unsigned long flags;
944
945 spin_lock_irqsave(ap->lock, flags);
946 device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
947 device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
948
949 link->eh_info.err_mask |= AC_ERR_DEV;
950 if (force_reset)
951 link->eh_info.action |= ATA_EH_RESET;
952 ata_link_abort(link);
953 spin_unlock_irqrestore(ap->lock, flags);
954}
955EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
956
957int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
958{
959 struct sas_tmf_task tmf_task = {};
960 return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
961 force_phy_id, &tmf_task);
962}
963EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
964
965static ssize_t sas_ncq_prio_supported_show(struct device *device,
966 struct device_attribute *attr,
967 char *buf)
968{
969 struct scsi_device *sdev = to_scsi_device(device);
970 struct domain_device *ddev = sdev_to_domain_dev(sdev);
971 bool supported;
972 int rc;
973
974 rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
975 if (rc)
976 return rc;
977
978 return sysfs_emit(buf, "%d\n", supported);
979}
980
981static struct device_attribute dev_attr_sas_ncq_prio_supported =
982 __ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
983
984static ssize_t sas_ncq_prio_enable_show(struct device *device,
985 struct device_attribute *attr,
986 char *buf)
987{
988 struct scsi_device *sdev = to_scsi_device(device);
989 struct domain_device *ddev = sdev_to_domain_dev(sdev);
990 bool enabled;
991 int rc;
992
993 rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
994 if (rc)
995 return rc;
996
997 return sysfs_emit(buf, "%d\n", enabled);
998}
999
1000static ssize_t sas_ncq_prio_enable_store(struct device *device,
1001 struct device_attribute *attr,
1002 const char *buf, size_t len)
1003{
1004 struct scsi_device *sdev = to_scsi_device(device);
1005 struct domain_device *ddev = sdev_to_domain_dev(sdev);
1006 bool enable;
1007 int rc;
1008
1009 rc = kstrtobool(buf, &enable);
1010 if (rc)
1011 return rc;
1012
1013 rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
1014 if (rc)
1015 return rc;
1016
1017 return len;
1018}
1019
1020static struct device_attribute dev_attr_sas_ncq_prio_enable =
1021 __ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
1022 sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
1023
1024static struct attribute *sas_ata_sdev_attrs[] = {
1025 &dev_attr_sas_ncq_prio_supported.attr,
1026 &dev_attr_sas_ncq_prio_enable.attr,
1027 NULL
1028};
1029
1030static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
1031 struct attribute *attr, int i)
1032{
1033 struct device *dev = kobj_to_dev(kobj);
1034 struct scsi_device *sdev = to_scsi_device(dev);
1035 struct domain_device *ddev = sdev_to_domain_dev(sdev);
1036
1037 if (!dev_is_sata(ddev))
1038 return 0;
1039
1040 return attr->mode;
1041}
1042
1043const struct attribute_group sas_ata_sdev_attr_group = {
1044 .attrs = sas_ata_sdev_attrs,
1045 .is_visible = sas_ata_attr_is_visible,
1046};
1047EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);