sas_discover.c 14 KB

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  1. /*
  2. * Serial Attached SCSI (SAS) Discover process
  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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22. *
  23. */
  24. #include <linux/scatterlist.h>
  25. #include <linux/slab.h>
  26. #include <scsi/scsi_host.h>
  27. #include <scsi/scsi_eh.h>
  28. #include "sas_internal.h"
  29. #include <scsi/scsi_transport.h>
  30. #include <scsi/scsi_transport_sas.h>
  31. #include <scsi/sas_ata.h>
  32. #include "../scsi_sas_internal.h"
  33. /* ---------- Basic task processing for discovery purposes ---------- */
  34. void sas_init_dev(struct domain_device *dev)
  35. {
  36. switch (dev->dev_type) {
  37. case SAS_END_DEV:
  38. break;
  39. case EDGE_DEV:
  40. case FANOUT_DEV:
  41. INIT_LIST_HEAD(&dev->ex_dev.children);
  42. mutex_init(&dev->ex_dev.cmd_mutex);
  43. break;
  44. case SATA_DEV:
  45. case SATA_PM:
  46. case SATA_PM_PORT:
  47. case SATA_PENDING:
  48. INIT_LIST_HEAD(&dev->sata_dev.children);
  49. break;
  50. default:
  51. break;
  52. }
  53. }
  54. /* ---------- Domain device discovery ---------- */
  55. /**
  56. * sas_get_port_device -- Discover devices which caused port creation
  57. * @port: pointer to struct sas_port of interest
  58. *
  59. * Devices directly attached to a HA port, have no parent. This is
  60. * how we know they are (domain) "root" devices. All other devices
  61. * do, and should have their "parent" pointer set appropriately as
  62. * soon as a child device is discovered.
  63. */
  64. static int sas_get_port_device(struct asd_sas_port *port)
  65. {
  66. struct asd_sas_phy *phy;
  67. struct sas_rphy *rphy;
  68. struct domain_device *dev;
  69. int rc = -ENODEV;
  70. dev = sas_alloc_device();
  71. if (!dev)
  72. return -ENOMEM;
  73. spin_lock_irq(&port->phy_list_lock);
  74. if (list_empty(&port->phy_list)) {
  75. spin_unlock_irq(&port->phy_list_lock);
  76. sas_put_device(dev);
  77. return -ENODEV;
  78. }
  79. phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
  80. spin_lock(&phy->frame_rcvd_lock);
  81. memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
  82. (size_t)phy->frame_rcvd_size));
  83. spin_unlock(&phy->frame_rcvd_lock);
  84. spin_unlock_irq(&port->phy_list_lock);
  85. if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
  86. struct dev_to_host_fis *fis =
  87. (struct dev_to_host_fis *) dev->frame_rcvd;
  88. if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
  89. fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
  90. && (fis->device & ~0x10) == 0)
  91. dev->dev_type = SATA_PM;
  92. else
  93. dev->dev_type = SATA_DEV;
  94. dev->tproto = SAS_PROTOCOL_SATA;
  95. } else {
  96. struct sas_identify_frame *id =
  97. (struct sas_identify_frame *) dev->frame_rcvd;
  98. dev->dev_type = id->dev_type;
  99. dev->iproto = id->initiator_bits;
  100. dev->tproto = id->target_bits;
  101. }
  102. sas_init_dev(dev);
  103. dev->port = port;
  104. switch (dev->dev_type) {
  105. case SATA_DEV:
  106. rc = sas_ata_init(dev);
  107. if (rc) {
  108. rphy = NULL;
  109. break;
  110. }
  111. /* fall through */
  112. case SAS_END_DEV:
  113. rphy = sas_end_device_alloc(port->port);
  114. break;
  115. case EDGE_DEV:
  116. rphy = sas_expander_alloc(port->port,
  117. SAS_EDGE_EXPANDER_DEVICE);
  118. break;
  119. case FANOUT_DEV:
  120. rphy = sas_expander_alloc(port->port,
  121. SAS_FANOUT_EXPANDER_DEVICE);
  122. break;
  123. default:
  124. printk("ERROR: Unidentified device type %d\n", dev->dev_type);
  125. rphy = NULL;
  126. break;
  127. }
  128. if (!rphy) {
  129. sas_put_device(dev);
  130. return rc;
  131. }
  132. rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
  133. memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
  134. sas_fill_in_rphy(dev, rphy);
  135. sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
  136. port->port_dev = dev;
  137. dev->linkrate = port->linkrate;
  138. dev->min_linkrate = port->linkrate;
  139. dev->max_linkrate = port->linkrate;
  140. dev->pathways = port->num_phys;
  141. memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
  142. memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
  143. memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
  144. port->disc.max_level = 0;
  145. sas_device_set_phy(dev, port->port);
  146. dev->rphy = rphy;
  147. get_device(&dev->rphy->dev);
  148. if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEV)
  149. list_add_tail(&dev->disco_list_node, &port->disco_list);
  150. else {
  151. spin_lock_irq(&port->dev_list_lock);
  152. list_add_tail(&dev->dev_list_node, &port->dev_list);
  153. spin_unlock_irq(&port->dev_list_lock);
  154. }
  155. spin_lock_irq(&port->phy_list_lock);
  156. list_for_each_entry(phy, &port->phy_list, port_phy_el)
  157. sas_phy_set_target(phy, dev);
  158. spin_unlock_irq(&port->phy_list_lock);
  159. return 0;
  160. }
  161. /* ---------- Discover and Revalidate ---------- */
  162. int sas_notify_lldd_dev_found(struct domain_device *dev)
  163. {
  164. int res = 0;
  165. struct sas_ha_struct *sas_ha = dev->port->ha;
  166. struct Scsi_Host *shost = sas_ha->core.shost;
  167. struct sas_internal *i = to_sas_internal(shost->transportt);
  168. if (i->dft->lldd_dev_found) {
  169. res = i->dft->lldd_dev_found(dev);
  170. if (res) {
  171. printk("sas: driver on pcidev %s cannot handle "
  172. "device %llx, error:%d\n",
  173. dev_name(sas_ha->dev),
  174. SAS_ADDR(dev->sas_addr), res);
  175. }
  176. kref_get(&dev->kref);
  177. }
  178. return res;
  179. }
  180. void sas_notify_lldd_dev_gone(struct domain_device *dev)
  181. {
  182. struct sas_ha_struct *sas_ha = dev->port->ha;
  183. struct Scsi_Host *shost = sas_ha->core.shost;
  184. struct sas_internal *i = to_sas_internal(shost->transportt);
  185. if (i->dft->lldd_dev_gone) {
  186. i->dft->lldd_dev_gone(dev);
  187. sas_put_device(dev);
  188. }
  189. }
  190. static void sas_probe_devices(struct work_struct *work)
  191. {
  192. struct domain_device *dev, *n;
  193. struct sas_discovery_event *ev = to_sas_discovery_event(work);
  194. struct asd_sas_port *port = ev->port;
  195. clear_bit(DISCE_PROBE, &port->disc.pending);
  196. /* devices must be domain members before link recovery and probe */
  197. list_for_each_entry(dev, &port->disco_list, disco_list_node) {
  198. spin_lock_irq(&port->dev_list_lock);
  199. list_add_tail(&dev->dev_list_node, &port->dev_list);
  200. spin_unlock_irq(&port->dev_list_lock);
  201. }
  202. sas_probe_sata(port);
  203. list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
  204. int err;
  205. err = sas_rphy_add(dev->rphy);
  206. if (err)
  207. sas_fail_probe(dev, __func__, err);
  208. else
  209. list_del_init(&dev->disco_list_node);
  210. }
  211. }
  212. /**
  213. * sas_discover_end_dev -- discover an end device (SSP, etc)
  214. * @end: pointer to domain device of interest
  215. *
  216. * See comment in sas_discover_sata().
  217. */
  218. int sas_discover_end_dev(struct domain_device *dev)
  219. {
  220. int res;
  221. res = sas_notify_lldd_dev_found(dev);
  222. if (res)
  223. return res;
  224. sas_discover_event(dev->port, DISCE_PROBE);
  225. return 0;
  226. }
  227. /* ---------- Device registration and unregistration ---------- */
  228. void sas_free_device(struct kref *kref)
  229. {
  230. struct domain_device *dev = container_of(kref, typeof(*dev), kref);
  231. put_device(&dev->rphy->dev);
  232. dev->rphy = NULL;
  233. if (dev->parent)
  234. sas_put_device(dev->parent);
  235. sas_port_put_phy(dev->phy);
  236. dev->phy = NULL;
  237. /* remove the phys and ports, everything else should be gone */
  238. if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
  239. kfree(dev->ex_dev.ex_phy);
  240. if (dev_is_sata(dev) && dev->sata_dev.ap) {
  241. ata_sas_port_destroy(dev->sata_dev.ap);
  242. dev->sata_dev.ap = NULL;
  243. }
  244. kfree(dev);
  245. }
  246. static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
  247. {
  248. sas_notify_lldd_dev_gone(dev);
  249. if (!dev->parent)
  250. dev->port->port_dev = NULL;
  251. else
  252. list_del_init(&dev->siblings);
  253. spin_lock_irq(&port->dev_list_lock);
  254. list_del_init(&dev->dev_list_node);
  255. if (dev_is_sata(dev))
  256. sas_ata_end_eh(dev->sata_dev.ap);
  257. spin_unlock_irq(&port->dev_list_lock);
  258. sas_put_device(dev);
  259. }
  260. static void sas_destruct_devices(struct work_struct *work)
  261. {
  262. struct domain_device *dev, *n;
  263. struct sas_discovery_event *ev = to_sas_discovery_event(work);
  264. struct asd_sas_port *port = ev->port;
  265. clear_bit(DISCE_DESTRUCT, &port->disc.pending);
  266. list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
  267. list_del_init(&dev->disco_list_node);
  268. sas_remove_children(&dev->rphy->dev);
  269. sas_rphy_delete(dev->rphy);
  270. sas_unregister_common_dev(port, dev);
  271. }
  272. }
  273. void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
  274. {
  275. if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
  276. !list_empty(&dev->disco_list_node)) {
  277. /* this rphy never saw sas_rphy_add */
  278. list_del_init(&dev->disco_list_node);
  279. sas_rphy_free(dev->rphy);
  280. sas_unregister_common_dev(port, dev);
  281. return;
  282. }
  283. if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
  284. sas_rphy_unlink(dev->rphy);
  285. list_move_tail(&dev->disco_list_node, &port->destroy_list);
  286. sas_discover_event(dev->port, DISCE_DESTRUCT);
  287. }
  288. }
  289. void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
  290. {
  291. struct domain_device *dev, *n;
  292. list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
  293. if (gone)
  294. set_bit(SAS_DEV_GONE, &dev->state);
  295. sas_unregister_dev(port, dev);
  296. }
  297. list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
  298. sas_unregister_dev(port, dev);
  299. port->port->rphy = NULL;
  300. }
  301. void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
  302. {
  303. struct sas_ha_struct *ha;
  304. struct sas_phy *new_phy;
  305. if (!dev)
  306. return;
  307. ha = dev->port->ha;
  308. new_phy = sas_port_get_phy(port);
  309. /* pin and record last seen phy */
  310. spin_lock_irq(&ha->phy_port_lock);
  311. if (new_phy) {
  312. sas_port_put_phy(dev->phy);
  313. dev->phy = new_phy;
  314. }
  315. spin_unlock_irq(&ha->phy_port_lock);
  316. }
  317. /* ---------- Discovery and Revalidation ---------- */
  318. /**
  319. * sas_discover_domain -- discover the domain
  320. * @port: port to the domain of interest
  321. *
  322. * NOTE: this process _must_ quit (return) as soon as any connection
  323. * errors are encountered. Connection recovery is done elsewhere.
  324. * Discover process only interrogates devices in order to discover the
  325. * domain.
  326. */
  327. static void sas_discover_domain(struct work_struct *work)
  328. {
  329. struct domain_device *dev;
  330. int error = 0;
  331. struct sas_discovery_event *ev = to_sas_discovery_event(work);
  332. struct asd_sas_port *port = ev->port;
  333. clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
  334. if (port->port_dev)
  335. return;
  336. error = sas_get_port_device(port);
  337. if (error)
  338. return;
  339. dev = port->port_dev;
  340. SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
  341. task_pid_nr(current));
  342. switch (dev->dev_type) {
  343. case SAS_END_DEV:
  344. error = sas_discover_end_dev(dev);
  345. break;
  346. case EDGE_DEV:
  347. case FANOUT_DEV:
  348. error = sas_discover_root_expander(dev);
  349. break;
  350. case SATA_DEV:
  351. case SATA_PM:
  352. #ifdef CONFIG_SCSI_SAS_ATA
  353. error = sas_discover_sata(dev);
  354. break;
  355. #else
  356. SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
  357. /* Fall through */
  358. #endif
  359. default:
  360. error = -ENXIO;
  361. SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
  362. break;
  363. }
  364. if (error) {
  365. sas_rphy_free(dev->rphy);
  366. list_del_init(&dev->disco_list_node);
  367. spin_lock_irq(&port->dev_list_lock);
  368. list_del_init(&dev->dev_list_node);
  369. spin_unlock_irq(&port->dev_list_lock);
  370. sas_put_device(dev);
  371. port->port_dev = NULL;
  372. }
  373. SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
  374. task_pid_nr(current), error);
  375. }
  376. static void sas_revalidate_domain(struct work_struct *work)
  377. {
  378. int res = 0;
  379. struct sas_discovery_event *ev = to_sas_discovery_event(work);
  380. struct asd_sas_port *port = ev->port;
  381. struct sas_ha_struct *ha = port->ha;
  382. /* prevent revalidation from finding sata links in recovery */
  383. mutex_lock(&ha->disco_mutex);
  384. if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
  385. SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
  386. port->id, task_pid_nr(current));
  387. goto out;
  388. }
  389. clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
  390. SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
  391. task_pid_nr(current));
  392. if (port->port_dev)
  393. res = sas_ex_revalidate_domain(port->port_dev);
  394. SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
  395. port->id, task_pid_nr(current), res);
  396. out:
  397. mutex_unlock(&ha->disco_mutex);
  398. }
  399. /* ---------- Events ---------- */
  400. static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
  401. {
  402. /* chained work is not subject to SA_HA_DRAINING or
  403. * SAS_HA_REGISTERED, because it is either submitted in the
  404. * workqueue, or known to be submitted from a context that is
  405. * not racing against draining
  406. */
  407. scsi_queue_work(ha->core.shost, &sw->work);
  408. }
  409. static void sas_chain_event(int event, unsigned long *pending,
  410. struct sas_work *sw,
  411. struct sas_ha_struct *ha)
  412. {
  413. if (!test_and_set_bit(event, pending)) {
  414. unsigned long flags;
  415. spin_lock_irqsave(&ha->lock, flags);
  416. sas_chain_work(ha, sw);
  417. spin_unlock_irqrestore(&ha->lock, flags);
  418. }
  419. }
  420. int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
  421. {
  422. struct sas_discovery *disc;
  423. if (!port)
  424. return 0;
  425. disc = &port->disc;
  426. BUG_ON(ev >= DISC_NUM_EVENTS);
  427. sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
  428. return 0;
  429. }
  430. /**
  431. * sas_init_disc -- initialize the discovery struct in the port
  432. * @port: pointer to struct port
  433. *
  434. * Called when the ports are being initialized.
  435. */
  436. void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
  437. {
  438. int i;
  439. static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
  440. [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
  441. [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
  442. [DISCE_PROBE] = sas_probe_devices,
  443. [DISCE_DESTRUCT] = sas_destruct_devices,
  444. };
  445. disc->pending = 0;
  446. for (i = 0; i < DISC_NUM_EVENTS; i++) {
  447. INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
  448. disc->disc_work[i].port = port;
  449. }
  450. }