sas_scsi_host.c 28 KB

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  1. /*
  2. * Serial Attached SCSI (SAS) class SCSI Host glue.
  3. *
  4. * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
  5. * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
  6. *
  7. * This file is licensed under GPLv2.
  8. *
  9. * This program is free software; you can redistribute it and/or
  10. * modify it under the terms of the GNU General Public License as
  11. * published by the Free Software Foundation; either version 2 of the
  12. * License, or (at your option) any later version.
  13. *
  14. * This program is distributed in the hope that it will be useful, but
  15. * WITHOUT ANY WARRANTY; without even the implied warranty of
  16. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17. * General Public License for more details.
  18. *
  19. * You should have received a copy of the GNU General Public License
  20. * along with this program; if not, write to the Free Software
  21. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22. * USA
  23. *
  24. */
  25. #include <linux/kthread.h>
  26. #include <linux/firmware.h>
  27. #include <linux/export.h>
  28. #include <linux/ctype.h>
  29. #include "sas_internal.h"
  30. #include <scsi/scsi_host.h>
  31. #include <scsi/scsi_device.h>
  32. #include <scsi/scsi_tcq.h>
  33. #include <scsi/scsi.h>
  34. #include <scsi/scsi_eh.h>
  35. #include <scsi/scsi_transport.h>
  36. #include <scsi/scsi_transport_sas.h>
  37. #include <scsi/sas_ata.h>
  38. #include "../scsi_sas_internal.h"
  39. #include "../scsi_transport_api.h"
  40. #include "../scsi_priv.h"
  41. #include <linux/err.h>
  42. #include <linux/blkdev.h>
  43. #include <linux/freezer.h>
  44. #include <linux/gfp.h>
  45. #include <linux/scatterlist.h>
  46. #include <linux/libata.h>
  47. /* ---------- SCSI Host glue ---------- */
  48. static void sas_scsi_task_done(struct sas_task *task)
  49. {
  50. struct task_status_struct *ts = &task->task_status;
  51. struct scsi_cmnd *sc = task->uldd_task;
  52. int hs = 0, stat = 0;
  53. if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  54. /* Aborted tasks will be completed by the error handler */
  55. SAS_DPRINTK("task done but aborted\n");
  56. return;
  57. }
  58. if (unlikely(!sc)) {
  59. SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  60. list_del_init(&task->list);
  61. sas_free_task(task);
  62. return;
  63. }
  64. if (ts->resp == SAS_TASK_UNDELIVERED) {
  65. /* transport error */
  66. hs = DID_NO_CONNECT;
  67. } else { /* ts->resp == SAS_TASK_COMPLETE */
  68. /* task delivered, what happened afterwards? */
  69. switch (ts->stat) {
  70. case SAS_DEV_NO_RESPONSE:
  71. case SAS_INTERRUPTED:
  72. case SAS_PHY_DOWN:
  73. case SAS_NAK_R_ERR:
  74. case SAS_OPEN_TO:
  75. hs = DID_NO_CONNECT;
  76. break;
  77. case SAS_DATA_UNDERRUN:
  78. scsi_set_resid(sc, ts->residual);
  79. if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  80. hs = DID_ERROR;
  81. break;
  82. case SAS_DATA_OVERRUN:
  83. hs = DID_ERROR;
  84. break;
  85. case SAS_QUEUE_FULL:
  86. hs = DID_SOFT_ERROR; /* retry */
  87. break;
  88. case SAS_DEVICE_UNKNOWN:
  89. hs = DID_BAD_TARGET;
  90. break;
  91. case SAS_SG_ERR:
  92. hs = DID_PARITY;
  93. break;
  94. case SAS_OPEN_REJECT:
  95. if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  96. hs = DID_SOFT_ERROR; /* retry */
  97. else
  98. hs = DID_ERROR;
  99. break;
  100. case SAS_PROTO_RESPONSE:
  101. SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
  102. "task; please report this\n",
  103. task->dev->port->ha->sas_ha_name);
  104. break;
  105. case SAS_ABORTED_TASK:
  106. hs = DID_ABORT;
  107. break;
  108. case SAM_STAT_CHECK_CONDITION:
  109. memcpy(sc->sense_buffer, ts->buf,
  110. min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
  111. stat = SAM_STAT_CHECK_CONDITION;
  112. break;
  113. default:
  114. stat = ts->stat;
  115. break;
  116. }
  117. }
  118. ASSIGN_SAS_TASK(sc, NULL);
  119. sc->result = (hs << 16) | stat;
  120. list_del_init(&task->list);
  121. sas_free_task(task);
  122. sc->scsi_done(sc);
  123. }
  124. static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
  125. struct domain_device *dev,
  126. gfp_t gfp_flags)
  127. {
  128. struct sas_task *task = sas_alloc_task(gfp_flags);
  129. struct scsi_lun lun;
  130. if (!task)
  131. return NULL;
  132. task->uldd_task = cmd;
  133. ASSIGN_SAS_TASK(cmd, task);
  134. task->dev = dev;
  135. task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
  136. task->ssp_task.retry_count = 1;
  137. int_to_scsilun(cmd->device->lun, &lun);
  138. memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
  139. task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
  140. memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
  141. task->scatter = scsi_sglist(cmd);
  142. task->num_scatter = scsi_sg_count(cmd);
  143. task->total_xfer_len = scsi_bufflen(cmd);
  144. task->data_dir = cmd->sc_data_direction;
  145. task->task_done = sas_scsi_task_done;
  146. return task;
  147. }
  148. int sas_queue_up(struct sas_task *task)
  149. {
  150. struct sas_ha_struct *sas_ha = task->dev->port->ha;
  151. struct scsi_core *core = &sas_ha->core;
  152. unsigned long flags;
  153. LIST_HEAD(list);
  154. spin_lock_irqsave(&core->task_queue_lock, flags);
  155. if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
  156. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  157. return -SAS_QUEUE_FULL;
  158. }
  159. list_add_tail(&task->list, &core->task_queue);
  160. core->task_queue_size += 1;
  161. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  162. wake_up_process(core->queue_thread);
  163. return 0;
  164. }
  165. int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
  166. {
  167. struct sas_internal *i = to_sas_internal(host->transportt);
  168. struct domain_device *dev = cmd_to_domain_dev(cmd);
  169. struct sas_ha_struct *sas_ha = dev->port->ha;
  170. struct sas_task *task;
  171. int res = 0;
  172. /* If the device fell off, no sense in issuing commands */
  173. if (test_bit(SAS_DEV_GONE, &dev->state)) {
  174. cmd->result = DID_BAD_TARGET << 16;
  175. goto out_done;
  176. }
  177. if (dev_is_sata(dev)) {
  178. spin_lock_irq(dev->sata_dev.ap->lock);
  179. res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
  180. spin_unlock_irq(dev->sata_dev.ap->lock);
  181. return res;
  182. }
  183. task = sas_create_task(cmd, dev, GFP_ATOMIC);
  184. if (!task)
  185. return SCSI_MLQUEUE_HOST_BUSY;
  186. /* Queue up, Direct Mode or Task Collector Mode. */
  187. if (sas_ha->lldd_max_execute_num < 2)
  188. res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
  189. else
  190. res = sas_queue_up(task);
  191. if (res)
  192. goto out_free_task;
  193. return 0;
  194. out_free_task:
  195. SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
  196. ASSIGN_SAS_TASK(cmd, NULL);
  197. sas_free_task(task);
  198. if (res == -SAS_QUEUE_FULL)
  199. cmd->result = DID_SOFT_ERROR << 16; /* retry */
  200. else
  201. cmd->result = DID_ERROR << 16;
  202. out_done:
  203. cmd->scsi_done(cmd);
  204. return 0;
  205. }
  206. static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
  207. {
  208. struct sas_task *task = TO_SAS_TASK(cmd);
  209. struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
  210. /* remove the aborted task flag to allow the task to be
  211. * completed now. At this point, we only get called following
  212. * an actual abort of the task, so we should be guaranteed not
  213. * to be racing with any completions from the LLD (hence we
  214. * don't need the task state lock to clear the flag) */
  215. task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
  216. /* Now call task_done. However, task will be free'd after
  217. * this */
  218. task->task_done(task);
  219. /* now finish the command and move it on to the error
  220. * handler done list, this also takes it off the
  221. * error handler pending list */
  222. scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
  223. }
  224. static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
  225. {
  226. struct scsi_cmnd *cmd, *n;
  227. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  228. if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
  229. cmd->device->lun == my_cmd->device->lun)
  230. sas_eh_finish_cmd(cmd);
  231. }
  232. }
  233. static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
  234. struct domain_device *dev)
  235. {
  236. struct scsi_cmnd *cmd, *n;
  237. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  238. struct domain_device *x = cmd_to_domain_dev(cmd);
  239. if (x == dev)
  240. sas_eh_finish_cmd(cmd);
  241. }
  242. }
  243. static void sas_scsi_clear_queue_port(struct list_head *error_q,
  244. struct asd_sas_port *port)
  245. {
  246. struct scsi_cmnd *cmd, *n;
  247. list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
  248. struct domain_device *dev = cmd_to_domain_dev(cmd);
  249. struct asd_sas_port *x = dev->port;
  250. if (x == port)
  251. sas_eh_finish_cmd(cmd);
  252. }
  253. }
  254. enum task_disposition {
  255. TASK_IS_DONE,
  256. TASK_IS_ABORTED,
  257. TASK_IS_AT_LU,
  258. TASK_IS_NOT_AT_LU,
  259. TASK_ABORT_FAILED,
  260. };
  261. static enum task_disposition sas_scsi_find_task(struct sas_task *task)
  262. {
  263. struct sas_ha_struct *ha = task->dev->port->ha;
  264. unsigned long flags;
  265. int i, res;
  266. struct sas_internal *si =
  267. to_sas_internal(task->dev->port->ha->core.shost->transportt);
  268. if (ha->lldd_max_execute_num > 1) {
  269. struct scsi_core *core = &ha->core;
  270. struct sas_task *t, *n;
  271. spin_lock_irqsave(&core->task_queue_lock, flags);
  272. list_for_each_entry_safe(t, n, &core->task_queue, list) {
  273. if (task == t) {
  274. list_del_init(&t->list);
  275. spin_unlock_irqrestore(&core->task_queue_lock,
  276. flags);
  277. SAS_DPRINTK("%s: task 0x%p aborted from "
  278. "task_queue\n",
  279. __func__, task);
  280. return TASK_IS_ABORTED;
  281. }
  282. }
  283. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  284. }
  285. for (i = 0; i < 5; i++) {
  286. SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
  287. res = si->dft->lldd_abort_task(task);
  288. spin_lock_irqsave(&task->task_state_lock, flags);
  289. if (task->task_state_flags & SAS_TASK_STATE_DONE) {
  290. spin_unlock_irqrestore(&task->task_state_lock, flags);
  291. SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
  292. task);
  293. return TASK_IS_DONE;
  294. }
  295. spin_unlock_irqrestore(&task->task_state_lock, flags);
  296. if (res == TMF_RESP_FUNC_COMPLETE) {
  297. SAS_DPRINTK("%s: task 0x%p is aborted\n",
  298. __func__, task);
  299. return TASK_IS_ABORTED;
  300. } else if (si->dft->lldd_query_task) {
  301. SAS_DPRINTK("%s: querying task 0x%p\n",
  302. __func__, task);
  303. res = si->dft->lldd_query_task(task);
  304. switch (res) {
  305. case TMF_RESP_FUNC_SUCC:
  306. SAS_DPRINTK("%s: task 0x%p at LU\n",
  307. __func__, task);
  308. return TASK_IS_AT_LU;
  309. case TMF_RESP_FUNC_COMPLETE:
  310. SAS_DPRINTK("%s: task 0x%p not at LU\n",
  311. __func__, task);
  312. return TASK_IS_NOT_AT_LU;
  313. case TMF_RESP_FUNC_FAILED:
  314. SAS_DPRINTK("%s: task 0x%p failed to abort\n",
  315. __func__, task);
  316. return TASK_ABORT_FAILED;
  317. }
  318. }
  319. }
  320. return res;
  321. }
  322. static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
  323. {
  324. int res = TMF_RESP_FUNC_FAILED;
  325. struct scsi_lun lun;
  326. struct sas_internal *i =
  327. to_sas_internal(dev->port->ha->core.shost->transportt);
  328. int_to_scsilun(cmd->device->lun, &lun);
  329. SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
  330. SAS_ADDR(dev->sas_addr),
  331. cmd->device->lun);
  332. if (i->dft->lldd_abort_task_set)
  333. res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
  334. if (res == TMF_RESP_FUNC_FAILED) {
  335. if (i->dft->lldd_clear_task_set)
  336. res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
  337. }
  338. if (res == TMF_RESP_FUNC_FAILED) {
  339. if (i->dft->lldd_lu_reset)
  340. res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
  341. }
  342. return res;
  343. }
  344. static int sas_recover_I_T(struct domain_device *dev)
  345. {
  346. int res = TMF_RESP_FUNC_FAILED;
  347. struct sas_internal *i =
  348. to_sas_internal(dev->port->ha->core.shost->transportt);
  349. SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
  350. SAS_ADDR(dev->sas_addr));
  351. if (i->dft->lldd_I_T_nexus_reset)
  352. res = i->dft->lldd_I_T_nexus_reset(dev);
  353. return res;
  354. }
  355. /* Find the sas_phy that's attached to this device */
  356. struct sas_phy *sas_find_local_phy(struct domain_device *dev)
  357. {
  358. struct domain_device *pdev = dev->parent;
  359. struct ex_phy *exphy = NULL;
  360. int i;
  361. /* Directly attached device */
  362. if (!pdev)
  363. return dev->port->phy;
  364. /* Otherwise look in the expander */
  365. for (i = 0; i < pdev->ex_dev.num_phys; i++)
  366. if (!memcmp(dev->sas_addr,
  367. pdev->ex_dev.ex_phy[i].attached_sas_addr,
  368. SAS_ADDR_SIZE)) {
  369. exphy = &pdev->ex_dev.ex_phy[i];
  370. break;
  371. }
  372. BUG_ON(!exphy);
  373. return exphy->phy;
  374. }
  375. EXPORT_SYMBOL_GPL(sas_find_local_phy);
  376. /* Attempt to send a LUN reset message to a device */
  377. int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
  378. {
  379. struct domain_device *dev = cmd_to_domain_dev(cmd);
  380. struct sas_internal *i =
  381. to_sas_internal(dev->port->ha->core.shost->transportt);
  382. struct scsi_lun lun;
  383. int res;
  384. int_to_scsilun(cmd->device->lun, &lun);
  385. if (!i->dft->lldd_lu_reset)
  386. return FAILED;
  387. res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
  388. if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
  389. return SUCCESS;
  390. return FAILED;
  391. }
  392. /* Attempt to send a phy (bus) reset */
  393. int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
  394. {
  395. struct domain_device *dev = cmd_to_domain_dev(cmd);
  396. struct sas_phy *phy = sas_find_local_phy(dev);
  397. int res;
  398. res = sas_phy_reset(phy, 1);
  399. if (res)
  400. SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
  401. kobject_name(&phy->dev.kobj),
  402. res);
  403. if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
  404. return SUCCESS;
  405. return FAILED;
  406. }
  407. /* Try to reset a device */
  408. static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
  409. {
  410. int res;
  411. struct Scsi_Host *shost = cmd->device->host;
  412. if (!shost->hostt->eh_device_reset_handler)
  413. goto try_bus_reset;
  414. res = shost->hostt->eh_device_reset_handler(cmd);
  415. if (res == SUCCESS)
  416. return res;
  417. try_bus_reset:
  418. if (shost->hostt->eh_bus_reset_handler)
  419. return shost->hostt->eh_bus_reset_handler(cmd);
  420. return FAILED;
  421. }
  422. static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
  423. struct list_head *work_q,
  424. struct list_head *done_q)
  425. {
  426. struct scsi_cmnd *cmd, *n;
  427. enum task_disposition res = TASK_IS_DONE;
  428. int tmf_resp, need_reset;
  429. struct sas_internal *i = to_sas_internal(shost->transportt);
  430. unsigned long flags;
  431. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  432. Again:
  433. list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
  434. struct sas_task *task = TO_SAS_TASK(cmd);
  435. if (!task)
  436. continue;
  437. list_del_init(&cmd->eh_entry);
  438. spin_lock_irqsave(&task->task_state_lock, flags);
  439. need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
  440. spin_unlock_irqrestore(&task->task_state_lock, flags);
  441. if (need_reset) {
  442. SAS_DPRINTK("%s: task 0x%p requests reset\n",
  443. __func__, task);
  444. goto reset;
  445. }
  446. SAS_DPRINTK("trying to find task 0x%p\n", task);
  447. res = sas_scsi_find_task(task);
  448. cmd->eh_eflags = 0;
  449. switch (res) {
  450. case TASK_IS_DONE:
  451. SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
  452. task);
  453. sas_eh_finish_cmd(cmd);
  454. continue;
  455. case TASK_IS_ABORTED:
  456. SAS_DPRINTK("%s: task 0x%p is aborted\n",
  457. __func__, task);
  458. sas_eh_finish_cmd(cmd);
  459. continue;
  460. case TASK_IS_AT_LU:
  461. SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
  462. reset:
  463. tmf_resp = sas_recover_lu(task->dev, cmd);
  464. if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
  465. SAS_DPRINTK("dev %016llx LU %x is "
  466. "recovered\n",
  467. SAS_ADDR(task->dev),
  468. cmd->device->lun);
  469. sas_eh_finish_cmd(cmd);
  470. sas_scsi_clear_queue_lu(work_q, cmd);
  471. goto Again;
  472. }
  473. /* fallthrough */
  474. case TASK_IS_NOT_AT_LU:
  475. case TASK_ABORT_FAILED:
  476. SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
  477. task);
  478. tmf_resp = sas_recover_I_T(task->dev);
  479. if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
  480. struct domain_device *dev = task->dev;
  481. SAS_DPRINTK("I_T %016llx recovered\n",
  482. SAS_ADDR(task->dev->sas_addr));
  483. sas_eh_finish_cmd(cmd);
  484. sas_scsi_clear_queue_I_T(work_q, dev);
  485. goto Again;
  486. }
  487. /* Hammer time :-) */
  488. try_to_reset_cmd_device(cmd);
  489. if (i->dft->lldd_clear_nexus_port) {
  490. struct asd_sas_port *port = task->dev->port;
  491. SAS_DPRINTK("clearing nexus for port:%d\n",
  492. port->id);
  493. res = i->dft->lldd_clear_nexus_port(port);
  494. if (res == TMF_RESP_FUNC_COMPLETE) {
  495. SAS_DPRINTK("clear nexus port:%d "
  496. "succeeded\n", port->id);
  497. sas_eh_finish_cmd(cmd);
  498. sas_scsi_clear_queue_port(work_q,
  499. port);
  500. goto Again;
  501. }
  502. }
  503. if (i->dft->lldd_clear_nexus_ha) {
  504. SAS_DPRINTK("clear nexus ha\n");
  505. res = i->dft->lldd_clear_nexus_ha(ha);
  506. if (res == TMF_RESP_FUNC_COMPLETE) {
  507. SAS_DPRINTK("clear nexus ha "
  508. "succeeded\n");
  509. sas_eh_finish_cmd(cmd);
  510. goto clear_q;
  511. }
  512. }
  513. /* If we are here -- this means that no amount
  514. * of effort could recover from errors. Quite
  515. * possibly the HA just disappeared.
  516. */
  517. SAS_DPRINTK("error from device %llx, LUN %x "
  518. "couldn't be recovered in any way\n",
  519. SAS_ADDR(task->dev->sas_addr),
  520. cmd->device->lun);
  521. sas_eh_finish_cmd(cmd);
  522. goto clear_q;
  523. }
  524. }
  525. return list_empty(work_q);
  526. clear_q:
  527. SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
  528. list_for_each_entry_safe(cmd, n, work_q, eh_entry)
  529. sas_eh_finish_cmd(cmd);
  530. return list_empty(work_q);
  531. }
  532. void sas_scsi_recover_host(struct Scsi_Host *shost)
  533. {
  534. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  535. unsigned long flags;
  536. LIST_HEAD(eh_work_q);
  537. spin_lock_irqsave(shost->host_lock, flags);
  538. list_splice_init(&shost->eh_cmd_q, &eh_work_q);
  539. shost->host_eh_scheduled = 0;
  540. spin_unlock_irqrestore(shost->host_lock, flags);
  541. SAS_DPRINTK("Enter %s\n", __func__);
  542. /*
  543. * Deal with commands that still have SAS tasks (i.e. they didn't
  544. * complete via the normal sas_task completion mechanism)
  545. */
  546. if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
  547. goto out;
  548. /*
  549. * Now deal with SCSI commands that completed ok but have a an error
  550. * code (and hopefully sense data) attached. This is roughly what
  551. * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
  552. * command we see here has no sas_task and is thus unknown to the HA.
  553. */
  554. if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
  555. if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
  556. scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
  557. out:
  558. /* now link into libata eh --- if we have any ata devices */
  559. sas_ata_strategy_handler(shost);
  560. scsi_eh_flush_done_q(&ha->eh_done_q);
  561. SAS_DPRINTK("--- Exit %s\n", __func__);
  562. return;
  563. }
  564. enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
  565. {
  566. struct sas_task *task = TO_SAS_TASK(cmd);
  567. unsigned long flags;
  568. enum blk_eh_timer_return rtn;
  569. if (sas_ata_timed_out(cmd, task, &rtn))
  570. return rtn;
  571. if (!task) {
  572. cmd->request->timeout /= 2;
  573. SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
  574. cmd, task, (cmd->request->timeout ?
  575. "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
  576. if (!cmd->request->timeout)
  577. return BLK_EH_NOT_HANDLED;
  578. return BLK_EH_RESET_TIMER;
  579. }
  580. spin_lock_irqsave(&task->task_state_lock, flags);
  581. BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
  582. if (task->task_state_flags & SAS_TASK_STATE_DONE) {
  583. spin_unlock_irqrestore(&task->task_state_lock, flags);
  584. SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
  585. "BLK_EH_HANDLED\n", cmd, task);
  586. return BLK_EH_HANDLED;
  587. }
  588. if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
  589. spin_unlock_irqrestore(&task->task_state_lock, flags);
  590. SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
  591. "BLK_EH_RESET_TIMER\n",
  592. cmd, task);
  593. return BLK_EH_RESET_TIMER;
  594. }
  595. task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  596. spin_unlock_irqrestore(&task->task_state_lock, flags);
  597. SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
  598. cmd, task);
  599. return BLK_EH_NOT_HANDLED;
  600. }
  601. int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
  602. {
  603. struct domain_device *dev = sdev_to_domain_dev(sdev);
  604. if (dev_is_sata(dev))
  605. return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
  606. return -EINVAL;
  607. }
  608. struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
  609. {
  610. struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
  611. struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
  612. struct domain_device *found_dev = NULL;
  613. int i;
  614. unsigned long flags;
  615. spin_lock_irqsave(&ha->phy_port_lock, flags);
  616. for (i = 0; i < ha->num_phys; i++) {
  617. struct asd_sas_port *port = ha->sas_port[i];
  618. struct domain_device *dev;
  619. spin_lock(&port->dev_list_lock);
  620. list_for_each_entry(dev, &port->dev_list, dev_list_node) {
  621. if (rphy == dev->rphy) {
  622. found_dev = dev;
  623. spin_unlock(&port->dev_list_lock);
  624. goto found;
  625. }
  626. }
  627. spin_unlock(&port->dev_list_lock);
  628. }
  629. found:
  630. spin_unlock_irqrestore(&ha->phy_port_lock, flags);
  631. return found_dev;
  632. }
  633. int sas_target_alloc(struct scsi_target *starget)
  634. {
  635. struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
  636. struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
  637. int res;
  638. if (!found_dev)
  639. return -ENODEV;
  640. if (dev_is_sata(found_dev)) {
  641. res = sas_ata_init_host_and_port(found_dev, starget);
  642. if (res)
  643. return res;
  644. }
  645. kref_get(&found_dev->kref);
  646. starget->hostdata = found_dev;
  647. return 0;
  648. }
  649. #define SAS_DEF_QD 256
  650. int sas_slave_configure(struct scsi_device *scsi_dev)
  651. {
  652. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  653. struct sas_ha_struct *sas_ha;
  654. BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
  655. if (dev_is_sata(dev)) {
  656. ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
  657. return 0;
  658. }
  659. sas_ha = dev->port->ha;
  660. sas_read_port_mode_page(scsi_dev);
  661. if (scsi_dev->tagged_supported) {
  662. scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
  663. scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
  664. } else {
  665. SAS_DPRINTK("device %llx, LUN %x doesn't support "
  666. "TCQ\n", SAS_ADDR(dev->sas_addr),
  667. scsi_dev->lun);
  668. scsi_dev->tagged_supported = 0;
  669. scsi_set_tag_type(scsi_dev, 0);
  670. scsi_deactivate_tcq(scsi_dev, 1);
  671. }
  672. scsi_dev->allow_restart = 1;
  673. return 0;
  674. }
  675. int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
  676. {
  677. struct domain_device *dev = sdev_to_domain_dev(sdev);
  678. if (dev_is_sata(dev))
  679. return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
  680. reason);
  681. switch (reason) {
  682. case SCSI_QDEPTH_DEFAULT:
  683. case SCSI_QDEPTH_RAMP_UP:
  684. if (!sdev->tagged_supported)
  685. depth = 1;
  686. scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  687. break;
  688. case SCSI_QDEPTH_QFULL:
  689. scsi_track_queue_full(sdev, depth);
  690. break;
  691. default:
  692. return -EOPNOTSUPP;
  693. }
  694. return depth;
  695. }
  696. int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
  697. {
  698. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  699. if (dev_is_sata(dev))
  700. return -EINVAL;
  701. if (!scsi_dev->tagged_supported)
  702. return 0;
  703. scsi_deactivate_tcq(scsi_dev, 1);
  704. scsi_set_tag_type(scsi_dev, qt);
  705. scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
  706. return qt;
  707. }
  708. int sas_bios_param(struct scsi_device *scsi_dev,
  709. struct block_device *bdev,
  710. sector_t capacity, int *hsc)
  711. {
  712. hsc[0] = 255;
  713. hsc[1] = 63;
  714. sector_div(capacity, 255*63);
  715. hsc[2] = capacity;
  716. return 0;
  717. }
  718. /* ---------- Task Collector Thread implementation ---------- */
  719. static void sas_queue(struct sas_ha_struct *sas_ha)
  720. {
  721. struct scsi_core *core = &sas_ha->core;
  722. unsigned long flags;
  723. LIST_HEAD(q);
  724. int can_queue;
  725. int res;
  726. struct sas_internal *i = to_sas_internal(core->shost->transportt);
  727. spin_lock_irqsave(&core->task_queue_lock, flags);
  728. while (!kthread_should_stop() &&
  729. !list_empty(&core->task_queue)) {
  730. can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
  731. if (can_queue >= 0) {
  732. can_queue = core->task_queue_size;
  733. list_splice_init(&core->task_queue, &q);
  734. } else {
  735. struct list_head *a, *n;
  736. can_queue = sas_ha->lldd_queue_size;
  737. list_for_each_safe(a, n, &core->task_queue) {
  738. list_move_tail(a, &q);
  739. if (--can_queue == 0)
  740. break;
  741. }
  742. can_queue = sas_ha->lldd_queue_size;
  743. }
  744. core->task_queue_size -= can_queue;
  745. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  746. {
  747. struct sas_task *task = list_entry(q.next,
  748. struct sas_task,
  749. list);
  750. list_del_init(&q);
  751. res = i->dft->lldd_execute_task(task, can_queue,
  752. GFP_KERNEL);
  753. if (unlikely(res))
  754. __list_add(&q, task->list.prev, &task->list);
  755. }
  756. spin_lock_irqsave(&core->task_queue_lock, flags);
  757. if (res) {
  758. list_splice_init(&q, &core->task_queue); /*at head*/
  759. core->task_queue_size += can_queue;
  760. }
  761. }
  762. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  763. }
  764. /**
  765. * sas_queue_thread -- The Task Collector thread
  766. * @_sas_ha: pointer to struct sas_ha
  767. */
  768. static int sas_queue_thread(void *_sas_ha)
  769. {
  770. struct sas_ha_struct *sas_ha = _sas_ha;
  771. while (1) {
  772. set_current_state(TASK_INTERRUPTIBLE);
  773. schedule();
  774. sas_queue(sas_ha);
  775. if (kthread_should_stop())
  776. break;
  777. }
  778. return 0;
  779. }
  780. int sas_init_queue(struct sas_ha_struct *sas_ha)
  781. {
  782. struct scsi_core *core = &sas_ha->core;
  783. spin_lock_init(&core->task_queue_lock);
  784. core->task_queue_size = 0;
  785. INIT_LIST_HEAD(&core->task_queue);
  786. core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
  787. "sas_queue_%d", core->shost->host_no);
  788. if (IS_ERR(core->queue_thread))
  789. return PTR_ERR(core->queue_thread);
  790. return 0;
  791. }
  792. void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
  793. {
  794. unsigned long flags;
  795. struct scsi_core *core = &sas_ha->core;
  796. struct sas_task *task, *n;
  797. kthread_stop(core->queue_thread);
  798. if (!list_empty(&core->task_queue))
  799. SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
  800. SAS_ADDR(sas_ha->sas_addr));
  801. spin_lock_irqsave(&core->task_queue_lock, flags);
  802. list_for_each_entry_safe(task, n, &core->task_queue, list) {
  803. struct scsi_cmnd *cmd = task->uldd_task;
  804. list_del_init(&task->list);
  805. ASSIGN_SAS_TASK(cmd, NULL);
  806. sas_free_task(task);
  807. cmd->result = DID_ABORT << 16;
  808. cmd->scsi_done(cmd);
  809. }
  810. spin_unlock_irqrestore(&core->task_queue_lock, flags);
  811. }
  812. /*
  813. * Call the LLDD task abort routine directly. This function is intended for
  814. * use by upper layers that need to tell the LLDD to abort a task.
  815. */
  816. int __sas_task_abort(struct sas_task *task)
  817. {
  818. struct sas_internal *si =
  819. to_sas_internal(task->dev->port->ha->core.shost->transportt);
  820. unsigned long flags;
  821. int res;
  822. spin_lock_irqsave(&task->task_state_lock, flags);
  823. if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
  824. task->task_state_flags & SAS_TASK_STATE_DONE) {
  825. spin_unlock_irqrestore(&task->task_state_lock, flags);
  826. SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
  827. task);
  828. return 0;
  829. }
  830. task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  831. spin_unlock_irqrestore(&task->task_state_lock, flags);
  832. if (!si->dft->lldd_abort_task)
  833. return -ENODEV;
  834. res = si->dft->lldd_abort_task(task);
  835. spin_lock_irqsave(&task->task_state_lock, flags);
  836. if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
  837. (res == TMF_RESP_FUNC_COMPLETE))
  838. {
  839. spin_unlock_irqrestore(&task->task_state_lock, flags);
  840. task->task_done(task);
  841. return 0;
  842. }
  843. if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  844. task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
  845. spin_unlock_irqrestore(&task->task_state_lock, flags);
  846. return -EAGAIN;
  847. }
  848. /*
  849. * Tell an upper layer that it needs to initiate an abort for a given task.
  850. * This should only ever be called by an LLDD.
  851. */
  852. void sas_task_abort(struct sas_task *task)
  853. {
  854. struct scsi_cmnd *sc = task->uldd_task;
  855. /* Escape for libsas internal commands */
  856. if (!sc) {
  857. if (!del_timer(&task->timer))
  858. return;
  859. task->timer.function(task->timer.data);
  860. return;
  861. }
  862. if (dev_is_sata(task->dev)) {
  863. sas_ata_task_abort(task);
  864. } else {
  865. struct request_queue *q = sc->device->request_queue;
  866. unsigned long flags;
  867. spin_lock_irqsave(q->queue_lock, flags);
  868. blk_abort_request(sc->request);
  869. spin_unlock_irqrestore(q->queue_lock, flags);
  870. scsi_schedule_eh(sc->device->host);
  871. }
  872. }
  873. int sas_slave_alloc(struct scsi_device *scsi_dev)
  874. {
  875. struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
  876. if (dev_is_sata(dev))
  877. return ata_sas_port_init(dev->sata_dev.ap);
  878. return 0;
  879. }
  880. void sas_target_destroy(struct scsi_target *starget)
  881. {
  882. struct domain_device *found_dev = starget->hostdata;
  883. if (!found_dev)
  884. return;
  885. if (dev_is_sata(found_dev))
  886. ata_sas_port_destroy(found_dev->sata_dev.ap);
  887. starget->hostdata = NULL;
  888. sas_put_device(found_dev);
  889. }
  890. static void sas_parse_addr(u8 *sas_addr, const char *p)
  891. {
  892. int i;
  893. for (i = 0; i < SAS_ADDR_SIZE; i++) {
  894. u8 h, l;
  895. if (!*p)
  896. break;
  897. h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
  898. p++;
  899. l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
  900. p++;
  901. sas_addr[i] = (h<<4) | l;
  902. }
  903. }
  904. #define SAS_STRING_ADDR_SIZE 16
  905. int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
  906. {
  907. int res;
  908. const struct firmware *fw;
  909. res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
  910. if (res)
  911. return res;
  912. if (fw->size < SAS_STRING_ADDR_SIZE) {
  913. res = -ENODEV;
  914. goto out;
  915. }
  916. sas_parse_addr(addr, fw->data);
  917. out:
  918. release_firmware(fw);
  919. return res;
  920. }
  921. EXPORT_SYMBOL_GPL(sas_request_addr);
  922. EXPORT_SYMBOL_GPL(sas_queuecommand);
  923. EXPORT_SYMBOL_GPL(sas_target_alloc);
  924. EXPORT_SYMBOL_GPL(sas_slave_configure);
  925. EXPORT_SYMBOL_GPL(sas_change_queue_depth);
  926. EXPORT_SYMBOL_GPL(sas_change_queue_type);
  927. EXPORT_SYMBOL_GPL(sas_bios_param);
  928. EXPORT_SYMBOL_GPL(__sas_task_abort);
  929. EXPORT_SYMBOL_GPL(sas_task_abort);
  930. EXPORT_SYMBOL_GPL(sas_phy_reset);
  931. EXPORT_SYMBOL_GPL(sas_phy_enable);
  932. EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
  933. EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
  934. EXPORT_SYMBOL_GPL(sas_slave_alloc);
  935. EXPORT_SYMBOL_GPL(sas_target_destroy);
  936. EXPORT_SYMBOL_GPL(sas_ioctl);