sas_ata.c 22 KB

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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. #include <linux/scatterlist.h>
  24. #include <linux/slab.h>
  25. #include <scsi/sas_ata.h>
  26. #include "sas_internal.h"
  27. #include <scsi/scsi_host.h>
  28. #include <scsi/scsi_device.h>
  29. #include <scsi/scsi_tcq.h>
  30. #include <scsi/scsi.h>
  31. #include <scsi/scsi_transport.h>
  32. #include <scsi/scsi_transport_sas.h>
  33. #include "../scsi_sas_internal.h"
  34. #include "../scsi_transport_api.h"
  35. #include <scsi/scsi_eh.h>
  36. static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  37. {
  38. /* Cheesy attempt to translate SAS errors into ATA. Hah! */
  39. /* transport error */
  40. if (ts->resp == SAS_TASK_UNDELIVERED)
  41. return AC_ERR_ATA_BUS;
  42. /* ts->resp == SAS_TASK_COMPLETE */
  43. /* task delivered, what happened afterwards? */
  44. switch (ts->stat) {
  45. case SAS_DEV_NO_RESPONSE:
  46. return AC_ERR_TIMEOUT;
  47. case SAS_INTERRUPTED:
  48. case SAS_PHY_DOWN:
  49. case SAS_NAK_R_ERR:
  50. return AC_ERR_ATA_BUS;
  51. case SAS_DATA_UNDERRUN:
  52. /*
  53. * Some programs that use the taskfile interface
  54. * (smartctl in particular) can cause underrun
  55. * problems. Ignore these errors, perhaps at our
  56. * peril.
  57. */
  58. return 0;
  59. case SAS_DATA_OVERRUN:
  60. case SAS_QUEUE_FULL:
  61. case SAS_DEVICE_UNKNOWN:
  62. case SAS_SG_ERR:
  63. return AC_ERR_INVALID;
  64. case SAS_OPEN_TO:
  65. case SAS_OPEN_REJECT:
  66. SAS_DPRINTK("%s: Saw error %d. What to do?\n",
  67. __func__, ts->stat);
  68. return AC_ERR_OTHER;
  69. case SAM_STAT_CHECK_CONDITION:
  70. case SAS_ABORTED_TASK:
  71. return AC_ERR_DEV;
  72. case SAS_PROTO_RESPONSE:
  73. /* This means the ending_fis has the error
  74. * value; return 0 here to collect it */
  75. return 0;
  76. default:
  77. return 0;
  78. }
  79. }
  80. static void sas_ata_task_done(struct sas_task *task)
  81. {
  82. struct ata_queued_cmd *qc = task->uldd_task;
  83. struct domain_device *dev;
  84. struct task_status_struct *stat = &task->task_status;
  85. struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  86. struct sas_ha_struct *sas_ha;
  87. enum ata_completion_errors ac;
  88. unsigned long flags;
  89. if (!qc)
  90. goto qc_already_gone;
  91. dev = qc->ap->private_data;
  92. sas_ha = dev->port->ha;
  93. spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
  94. if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
  95. ((stat->stat == SAM_STAT_CHECK_CONDITION &&
  96. dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
  97. ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
  98. qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
  99. dev->sata_dev.sstatus = resp->sstatus;
  100. dev->sata_dev.serror = resp->serror;
  101. dev->sata_dev.scontrol = resp->scontrol;
  102. } else {
  103. ac = sas_to_ata_err(stat);
  104. if (ac) {
  105. SAS_DPRINTK("%s: SAS error %x\n", __func__,
  106. stat->stat);
  107. /* We saw a SAS error. Send a vague error. */
  108. qc->err_mask = ac;
  109. dev->sata_dev.tf.feature = 0x04; /* status err */
  110. dev->sata_dev.tf.command = ATA_ERR;
  111. }
  112. }
  113. qc->lldd_task = NULL;
  114. if (qc->scsicmd)
  115. ASSIGN_SAS_TASK(qc->scsicmd, NULL);
  116. ata_qc_complete(qc);
  117. spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
  118. /*
  119. * If the sas_task has an ata qc, a scsi_cmnd and the aborted
  120. * flag is set, then we must have come in via the libsas EH
  121. * functions. When we exit this function, we need to put the
  122. * scsi_cmnd on the list of finished errors. The ata_qc_complete
  123. * call cleans up the libata side of things but we're protected
  124. * from the scsi_cmnd going away because the scsi_cmnd is owned
  125. * by the EH, making libata's call to scsi_done a NOP.
  126. */
  127. spin_lock_irqsave(&task->task_state_lock, flags);
  128. if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
  129. scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
  130. spin_unlock_irqrestore(&task->task_state_lock, flags);
  131. qc_already_gone:
  132. list_del_init(&task->list);
  133. sas_free_task(task);
  134. }
  135. static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
  136. {
  137. int res;
  138. struct sas_task *task;
  139. struct domain_device *dev = qc->ap->private_data;
  140. struct sas_ha_struct *sas_ha = dev->port->ha;
  141. struct Scsi_Host *host = sas_ha->core.shost;
  142. struct sas_internal *i = to_sas_internal(host->transportt);
  143. struct scatterlist *sg;
  144. unsigned int xfer = 0;
  145. unsigned int si;
  146. /* If the device fell off, no sense in issuing commands */
  147. if (dev->gone)
  148. return AC_ERR_SYSTEM;
  149. task = sas_alloc_task(GFP_ATOMIC);
  150. if (!task)
  151. return AC_ERR_SYSTEM;
  152. task->dev = dev;
  153. task->task_proto = SAS_PROTOCOL_STP;
  154. task->task_done = sas_ata_task_done;
  155. if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
  156. qc->tf.command == ATA_CMD_FPDMA_READ) {
  157. /* Need to zero out the tag libata assigned us */
  158. qc->tf.nsect = 0;
  159. }
  160. ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
  161. task->uldd_task = qc;
  162. if (ata_is_atapi(qc->tf.protocol)) {
  163. memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
  164. task->total_xfer_len = qc->nbytes;
  165. task->num_scatter = qc->n_elem;
  166. } else {
  167. for_each_sg(qc->sg, sg, qc->n_elem, si)
  168. xfer += sg->length;
  169. task->total_xfer_len = xfer;
  170. task->num_scatter = si;
  171. }
  172. task->data_dir = qc->dma_dir;
  173. task->scatter = qc->sg;
  174. task->ata_task.retry_count = 1;
  175. task->task_state_flags = SAS_TASK_STATE_PENDING;
  176. qc->lldd_task = task;
  177. switch (qc->tf.protocol) {
  178. case ATA_PROT_NCQ:
  179. task->ata_task.use_ncq = 1;
  180. /* fall through */
  181. case ATAPI_PROT_DMA:
  182. case ATA_PROT_DMA:
  183. task->ata_task.dma_xfer = 1;
  184. break;
  185. }
  186. if (qc->scsicmd)
  187. ASSIGN_SAS_TASK(qc->scsicmd, task);
  188. if (sas_ha->lldd_max_execute_num < 2)
  189. res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
  190. else
  191. res = sas_queue_up(task);
  192. /* Examine */
  193. if (res) {
  194. SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
  195. if (qc->scsicmd)
  196. ASSIGN_SAS_TASK(qc->scsicmd, NULL);
  197. sas_free_task(task);
  198. return AC_ERR_SYSTEM;
  199. }
  200. return 0;
  201. }
  202. static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
  203. {
  204. struct domain_device *dev = qc->ap->private_data;
  205. memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
  206. return true;
  207. }
  208. static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
  209. unsigned long deadline)
  210. {
  211. struct ata_port *ap = link->ap;
  212. struct domain_device *dev = ap->private_data;
  213. struct sas_internal *i =
  214. to_sas_internal(dev->port->ha->core.shost->transportt);
  215. int res = TMF_RESP_FUNC_FAILED;
  216. int ret = 0;
  217. if (i->dft->lldd_I_T_nexus_reset)
  218. res = i->dft->lldd_I_T_nexus_reset(dev);
  219. if (res != TMF_RESP_FUNC_COMPLETE) {
  220. SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
  221. ret = -EAGAIN;
  222. }
  223. switch (dev->sata_dev.command_set) {
  224. case ATA_COMMAND_SET:
  225. SAS_DPRINTK("%s: Found ATA device.\n", __func__);
  226. *class = ATA_DEV_ATA;
  227. break;
  228. case ATAPI_COMMAND_SET:
  229. SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
  230. *class = ATA_DEV_ATAPI;
  231. break;
  232. default:
  233. SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
  234. __func__,
  235. dev->sata_dev.command_set);
  236. *class = ATA_DEV_UNKNOWN;
  237. break;
  238. }
  239. ap->cbl = ATA_CBL_SATA;
  240. return ret;
  241. }
  242. static void sas_ata_post_internal(struct ata_queued_cmd *qc)
  243. {
  244. if (qc->flags & ATA_QCFLAG_FAILED)
  245. qc->err_mask |= AC_ERR_OTHER;
  246. if (qc->err_mask) {
  247. /*
  248. * Find the sas_task and kill it. By this point,
  249. * libata has decided to kill the qc, so we needn't
  250. * bother with sas_ata_task_done. But we still
  251. * ought to abort the task.
  252. */
  253. struct sas_task *task = qc->lldd_task;
  254. unsigned long flags;
  255. qc->lldd_task = NULL;
  256. if (task) {
  257. /* Should this be a AT(API) device reset? */
  258. spin_lock_irqsave(&task->task_state_lock, flags);
  259. task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
  260. spin_unlock_irqrestore(&task->task_state_lock, flags);
  261. task->uldd_task = NULL;
  262. __sas_task_abort(task);
  263. }
  264. }
  265. }
  266. static struct ata_port_operations sas_sata_ops = {
  267. .prereset = ata_std_prereset,
  268. .softreset = NULL,
  269. .hardreset = sas_ata_hard_reset,
  270. .postreset = ata_std_postreset,
  271. .error_handler = ata_std_error_handler,
  272. .post_internal_cmd = sas_ata_post_internal,
  273. .qc_defer = ata_std_qc_defer,
  274. .qc_prep = ata_noop_qc_prep,
  275. .qc_issue = sas_ata_qc_issue,
  276. .qc_fill_rtf = sas_ata_qc_fill_rtf,
  277. .port_start = ata_sas_port_start,
  278. .port_stop = ata_sas_port_stop,
  279. };
  280. static struct ata_port_info sata_port_info = {
  281. .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
  282. ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
  283. .pio_mask = 0x1f, /* PIO0-4 */
  284. .mwdma_mask = 0x07, /* MWDMA0-2 */
  285. .udma_mask = ATA_UDMA6,
  286. .port_ops = &sas_sata_ops
  287. };
  288. int sas_ata_init_host_and_port(struct domain_device *found_dev,
  289. struct scsi_target *starget)
  290. {
  291. struct Scsi_Host *shost = dev_to_shost(&starget->dev);
  292. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  293. struct ata_port *ap;
  294. ata_host_init(&found_dev->sata_dev.ata_host,
  295. ha->dev,
  296. sata_port_info.flags,
  297. &sas_sata_ops);
  298. ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
  299. &sata_port_info,
  300. shost);
  301. if (!ap) {
  302. SAS_DPRINTK("ata_sas_port_alloc failed.\n");
  303. return -ENODEV;
  304. }
  305. ap->private_data = found_dev;
  306. ap->cbl = ATA_CBL_SATA;
  307. ap->scsi_host = shost;
  308. found_dev->sata_dev.ap = ap;
  309. return 0;
  310. }
  311. void sas_ata_task_abort(struct sas_task *task)
  312. {
  313. struct ata_queued_cmd *qc = task->uldd_task;
  314. struct completion *waiting;
  315. /* Bounce SCSI-initiated commands to the SCSI EH */
  316. if (qc->scsicmd) {
  317. struct request_queue *q = qc->scsicmd->device->request_queue;
  318. unsigned long flags;
  319. spin_lock_irqsave(q->queue_lock, flags);
  320. blk_abort_request(qc->scsicmd->request);
  321. spin_unlock_irqrestore(q->queue_lock, flags);
  322. scsi_schedule_eh(qc->scsicmd->device->host);
  323. return;
  324. }
  325. /* Internal command, fake a timeout and complete. */
  326. qc->flags &= ~ATA_QCFLAG_ACTIVE;
  327. qc->flags |= ATA_QCFLAG_FAILED;
  328. qc->err_mask |= AC_ERR_TIMEOUT;
  329. waiting = qc->private_data;
  330. complete(waiting);
  331. }
  332. static void sas_task_timedout(unsigned long _task)
  333. {
  334. struct sas_task *task = (void *) _task;
  335. unsigned long flags;
  336. spin_lock_irqsave(&task->task_state_lock, flags);
  337. if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  338. task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  339. spin_unlock_irqrestore(&task->task_state_lock, flags);
  340. complete(&task->completion);
  341. }
  342. static void sas_disc_task_done(struct sas_task *task)
  343. {
  344. if (!del_timer(&task->timer))
  345. return;
  346. complete(&task->completion);
  347. }
  348. #define SAS_DEV_TIMEOUT 10
  349. /**
  350. * sas_execute_task -- Basic task processing for discovery
  351. * @task: the task to be executed
  352. * @buffer: pointer to buffer to do I/O
  353. * @size: size of @buffer
  354. * @dma_dir: DMA direction. DMA_xxx
  355. */
  356. static int sas_execute_task(struct sas_task *task, void *buffer, int size,
  357. enum dma_data_direction dma_dir)
  358. {
  359. int res = 0;
  360. struct scatterlist *scatter = NULL;
  361. struct task_status_struct *ts = &task->task_status;
  362. int num_scatter = 0;
  363. int retries = 0;
  364. struct sas_internal *i =
  365. to_sas_internal(task->dev->port->ha->core.shost->transportt);
  366. if (dma_dir != DMA_NONE) {
  367. scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
  368. if (!scatter)
  369. goto out;
  370. sg_init_one(scatter, buffer, size);
  371. num_scatter = 1;
  372. }
  373. task->task_proto = task->dev->tproto;
  374. task->scatter = scatter;
  375. task->num_scatter = num_scatter;
  376. task->total_xfer_len = size;
  377. task->data_dir = dma_dir;
  378. task->task_done = sas_disc_task_done;
  379. if (dma_dir != DMA_NONE &&
  380. sas_protocol_ata(task->task_proto)) {
  381. task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
  382. task->scatter,
  383. task->num_scatter,
  384. task->data_dir);
  385. }
  386. for (retries = 0; retries < 5; retries++) {
  387. task->task_state_flags = SAS_TASK_STATE_PENDING;
  388. init_completion(&task->completion);
  389. task->timer.data = (unsigned long) task;
  390. task->timer.function = sas_task_timedout;
  391. task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
  392. add_timer(&task->timer);
  393. res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  394. if (res) {
  395. del_timer(&task->timer);
  396. SAS_DPRINTK("executing SAS discovery task failed:%d\n",
  397. res);
  398. goto ex_err;
  399. }
  400. wait_for_completion(&task->completion);
  401. res = -ECOMM;
  402. if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
  403. int res2;
  404. SAS_DPRINTK("task aborted, flags:0x%x\n",
  405. task->task_state_flags);
  406. res2 = i->dft->lldd_abort_task(task);
  407. SAS_DPRINTK("came back from abort task\n");
  408. if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
  409. if (res2 == TMF_RESP_FUNC_COMPLETE)
  410. continue; /* Retry the task */
  411. else
  412. goto ex_err;
  413. }
  414. }
  415. if (task->task_status.stat == SAM_STAT_BUSY ||
  416. task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
  417. task->task_status.stat == SAS_QUEUE_FULL) {
  418. SAS_DPRINTK("task: q busy, sleeping...\n");
  419. schedule_timeout_interruptible(HZ);
  420. } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
  421. struct scsi_sense_hdr shdr;
  422. if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
  423. &shdr)) {
  424. SAS_DPRINTK("couldn't normalize sense\n");
  425. continue;
  426. }
  427. if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
  428. (shdr.sense_key == 2 && shdr.asc == 4 &&
  429. shdr.ascq == 1)) {
  430. SAS_DPRINTK("device %016llx LUN: %016llx "
  431. "powering up or not ready yet, "
  432. "sleeping...\n",
  433. SAS_ADDR(task->dev->sas_addr),
  434. SAS_ADDR(task->ssp_task.LUN));
  435. schedule_timeout_interruptible(5*HZ);
  436. } else if (shdr.sense_key == 1) {
  437. res = 0;
  438. break;
  439. } else if (shdr.sense_key == 5) {
  440. break;
  441. } else {
  442. SAS_DPRINTK("dev %016llx LUN: %016llx "
  443. "sense key:0x%x ASC:0x%x ASCQ:0x%x"
  444. "\n",
  445. SAS_ADDR(task->dev->sas_addr),
  446. SAS_ADDR(task->ssp_task.LUN),
  447. shdr.sense_key,
  448. shdr.asc, shdr.ascq);
  449. }
  450. } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
  451. task->task_status.stat != SAM_STAT_GOOD) {
  452. SAS_DPRINTK("task finished with resp:0x%x, "
  453. "stat:0x%x\n",
  454. task->task_status.resp,
  455. task->task_status.stat);
  456. goto ex_err;
  457. } else {
  458. res = 0;
  459. break;
  460. }
  461. }
  462. ex_err:
  463. if (dma_dir != DMA_NONE) {
  464. if (sas_protocol_ata(task->task_proto))
  465. dma_unmap_sg(task->dev->port->ha->dev,
  466. task->scatter, task->num_scatter,
  467. task->data_dir);
  468. kfree(scatter);
  469. }
  470. out:
  471. return res;
  472. }
  473. /* ---------- SATA ---------- */
  474. static void sas_get_ata_command_set(struct domain_device *dev)
  475. {
  476. struct dev_to_host_fis *fis =
  477. (struct dev_to_host_fis *) dev->frame_rcvd;
  478. if ((fis->sector_count == 1 && /* ATA */
  479. fis->lbal == 1 &&
  480. fis->lbam == 0 &&
  481. fis->lbah == 0 &&
  482. fis->device == 0)
  483. ||
  484. (fis->sector_count == 0 && /* CE-ATA (mATA) */
  485. fis->lbal == 0 &&
  486. fis->lbam == 0xCE &&
  487. fis->lbah == 0xAA &&
  488. (fis->device & ~0x10) == 0))
  489. dev->sata_dev.command_set = ATA_COMMAND_SET;
  490. else if ((fis->interrupt_reason == 1 && /* ATAPI */
  491. fis->lbal == 1 &&
  492. fis->byte_count_low == 0x14 &&
  493. fis->byte_count_high == 0xEB &&
  494. (fis->device & ~0x10) == 0))
  495. dev->sata_dev.command_set = ATAPI_COMMAND_SET;
  496. else if ((fis->sector_count == 1 && /* SEMB */
  497. fis->lbal == 1 &&
  498. fis->lbam == 0x3C &&
  499. fis->lbah == 0xC3 &&
  500. fis->device == 0)
  501. ||
  502. (fis->interrupt_reason == 1 && /* SATA PM */
  503. fis->lbal == 1 &&
  504. fis->byte_count_low == 0x69 &&
  505. fis->byte_count_high == 0x96 &&
  506. (fis->device & ~0x10) == 0))
  507. /* Treat it as a superset? */
  508. dev->sata_dev.command_set = ATAPI_COMMAND_SET;
  509. }
  510. /**
  511. * sas_issue_ata_cmd -- Basic SATA command processing for discovery
  512. * @dev: the device to send the command to
  513. * @command: the command register
  514. * @features: the features register
  515. * @buffer: pointer to buffer to do I/O
  516. * @size: size of @buffer
  517. * @dma_dir: DMA direction. DMA_xxx
  518. */
  519. static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
  520. u8 features, void *buffer, int size,
  521. enum dma_data_direction dma_dir)
  522. {
  523. int res = 0;
  524. struct sas_task *task;
  525. struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
  526. &dev->frame_rcvd[0];
  527. res = -ENOMEM;
  528. task = sas_alloc_task(GFP_KERNEL);
  529. if (!task)
  530. goto out;
  531. task->dev = dev;
  532. task->ata_task.fis.fis_type = 0x27;
  533. task->ata_task.fis.command = command;
  534. task->ata_task.fis.features = features;
  535. task->ata_task.fis.device = d2h_fis->device;
  536. task->ata_task.retry_count = 1;
  537. res = sas_execute_task(task, buffer, size, dma_dir);
  538. sas_free_task(task);
  539. out:
  540. return res;
  541. }
  542. #define ATA_IDENTIFY_DEV 0xEC
  543. #define ATA_IDENTIFY_PACKET_DEV 0xA1
  544. #define ATA_SET_FEATURES 0xEF
  545. #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
  546. /**
  547. * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
  548. * @dev: STP/SATA device of interest (ATA/ATAPI)
  549. *
  550. * The LLDD has already been notified of this device, so that we can
  551. * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY
  552. * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
  553. * performance for this device.
  554. */
  555. static int sas_discover_sata_dev(struct domain_device *dev)
  556. {
  557. int res;
  558. __le16 *identify_x;
  559. u8 command;
  560. identify_x = kzalloc(512, GFP_KERNEL);
  561. if (!identify_x)
  562. return -ENOMEM;
  563. if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
  564. dev->sata_dev.identify_device = identify_x;
  565. command = ATA_IDENTIFY_DEV;
  566. } else {
  567. dev->sata_dev.identify_packet_device = identify_x;
  568. command = ATA_IDENTIFY_PACKET_DEV;
  569. }
  570. res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
  571. DMA_FROM_DEVICE);
  572. if (res)
  573. goto out_err;
  574. /* lives on the media? */
  575. if (le16_to_cpu(identify_x[0]) & 4) {
  576. /* incomplete response */
  577. SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
  578. "dev %llx\n", SAS_ADDR(dev->sas_addr));
  579. if (!(identify_x[83] & cpu_to_le16(1<<6)))
  580. goto cont1;
  581. res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
  582. ATA_FEATURE_PUP_STBY_SPIN_UP,
  583. NULL, 0, DMA_NONE);
  584. if (res)
  585. goto cont1;
  586. schedule_timeout_interruptible(5*HZ); /* More time? */
  587. res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
  588. DMA_FROM_DEVICE);
  589. if (res)
  590. goto out_err;
  591. }
  592. cont1:
  593. /* XXX Hint: register this SATA device with SATL.
  594. When this returns, dev->sata_dev->lu is alive and
  595. present.
  596. sas_satl_register_dev(dev);
  597. */
  598. sas_fill_in_rphy(dev, dev->rphy);
  599. return 0;
  600. out_err:
  601. dev->sata_dev.identify_packet_device = NULL;
  602. dev->sata_dev.identify_device = NULL;
  603. kfree(identify_x);
  604. return res;
  605. }
  606. static int sas_discover_sata_pm(struct domain_device *dev)
  607. {
  608. return -ENODEV;
  609. }
  610. /**
  611. * sas_discover_sata -- discover an STP/SATA domain device
  612. * @dev: pointer to struct domain_device of interest
  613. *
  614. * First we notify the LLDD of this device, so we can send frames to
  615. * it. Then depending on the type of device we call the appropriate
  616. * discover functions. Once device discover is done, we notify the
  617. * LLDD so that it can fine-tune its parameters for the device, by
  618. * removing it and then adding it. That is, the second time around,
  619. * the driver would have certain fields, that it is looking at, set.
  620. * Finally we initialize the kobj so that the device can be added to
  621. * the system at registration time. Devices directly attached to a HA
  622. * port, have no parents. All other devices do, and should have their
  623. * "parent" pointer set appropriately before calling this function.
  624. */
  625. int sas_discover_sata(struct domain_device *dev)
  626. {
  627. int res;
  628. sas_get_ata_command_set(dev);
  629. res = sas_notify_lldd_dev_found(dev);
  630. if (res)
  631. return res;
  632. switch (dev->dev_type) {
  633. case SATA_DEV:
  634. res = sas_discover_sata_dev(dev);
  635. break;
  636. case SATA_PM:
  637. res = sas_discover_sata_pm(dev);
  638. break;
  639. default:
  640. break;
  641. }
  642. sas_notify_lldd_dev_gone(dev);
  643. if (!res) {
  644. sas_notify_lldd_dev_found(dev);
  645. res = sas_rphy_add(dev->rphy);
  646. }
  647. return res;
  648. }
  649. void sas_ata_strategy_handler(struct Scsi_Host *shost)
  650. {
  651. struct scsi_device *sdev;
  652. shost_for_each_device(sdev, shost) {
  653. struct domain_device *ddev = sdev_to_domain_dev(sdev);
  654. struct ata_port *ap = ddev->sata_dev.ap;
  655. if (!dev_is_sata(ddev))
  656. continue;
  657. ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
  658. ata_scsi_port_error_handler(shost, ap);
  659. }
  660. }
  661. int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
  662. enum blk_eh_timer_return *rtn)
  663. {
  664. struct domain_device *ddev = cmd_to_domain_dev(cmd);
  665. if (!dev_is_sata(ddev) || task)
  666. return 0;
  667. /* we're a sata device with no task, so this must be a libata
  668. * eh timeout. Ideally should hook into libata timeout
  669. * handling, but there's no point, it just wants to activate
  670. * the eh thread */
  671. *rtn = BLK_EH_NOT_HANDLED;
  672. return 1;
  673. }
  674. int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
  675. struct list_head *done_q)
  676. {
  677. int rtn = 0;
  678. struct scsi_cmnd *cmd, *n;
  679. struct ata_port *ap;
  680. do {
  681. LIST_HEAD(sata_q);
  682. ap = NULL;
  683. list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
  684. struct domain_device *ddev = cmd_to_domain_dev(cmd);
  685. if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
  686. continue;
  687. if (ap && ap != ddev->sata_dev.ap)
  688. continue;
  689. ap = ddev->sata_dev.ap;
  690. rtn = 1;
  691. list_move(&cmd->eh_entry, &sata_q);
  692. }
  693. if (!list_empty(&sata_q)) {
  694. ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
  695. ata_scsi_cmd_error_handler(shost, ap, &sata_q);
  696. }
  697. } while (ap);
  698. return rtn;
  699. }