sas_init.c 8.7 KB

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  1. /*
  2. * Serial Attached SCSI (SAS) Transport Layer initialization
  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/module.h>
  26. #include <linux/slab.h>
  27. #include <linux/init.h>
  28. #include <linux/device.h>
  29. #include <linux/spinlock.h>
  30. #include <scsi/scsi_host.h>
  31. #include <scsi/scsi_device.h>
  32. #include <scsi/scsi_transport.h>
  33. #include <scsi/scsi_transport_sas.h>
  34. #include "sas_internal.h"
  35. #include "../scsi_sas_internal.h"
  36. static struct kmem_cache *sas_task_cache;
  37. struct sas_task *sas_alloc_task(gfp_t flags)
  38. {
  39. struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
  40. if (task) {
  41. INIT_LIST_HEAD(&task->list);
  42. spin_lock_init(&task->task_state_lock);
  43. task->task_state_flags = SAS_TASK_STATE_PENDING;
  44. init_timer(&task->timer);
  45. init_completion(&task->completion);
  46. }
  47. return task;
  48. }
  49. EXPORT_SYMBOL_GPL(sas_alloc_task);
  50. void sas_free_task(struct sas_task *task)
  51. {
  52. if (task) {
  53. BUG_ON(!list_empty(&task->list));
  54. kmem_cache_free(sas_task_cache, task);
  55. }
  56. }
  57. EXPORT_SYMBOL_GPL(sas_free_task);
  58. /*------------ SAS addr hash -----------*/
  59. void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
  60. {
  61. const u32 poly = 0x00DB2777;
  62. u32 r = 0;
  63. int i;
  64. for (i = 0; i < 8; i++) {
  65. int b;
  66. for (b = 7; b >= 0; b--) {
  67. r <<= 1;
  68. if ((1 << b) & sas_addr[i]) {
  69. if (!(r & 0x01000000))
  70. r ^= poly;
  71. } else if (r & 0x01000000)
  72. r ^= poly;
  73. }
  74. }
  75. hashed[0] = (r >> 16) & 0xFF;
  76. hashed[1] = (r >> 8) & 0xFF ;
  77. hashed[2] = r & 0xFF;
  78. }
  79. /* ---------- HA events ---------- */
  80. void sas_hae_reset(struct work_struct *work)
  81. {
  82. struct sas_ha_event *ev =
  83. container_of(work, struct sas_ha_event, work);
  84. struct sas_ha_struct *ha = ev->ha;
  85. sas_begin_event(HAE_RESET, &ha->event_lock,
  86. &ha->pending);
  87. }
  88. int sas_register_ha(struct sas_ha_struct *sas_ha)
  89. {
  90. int error = 0;
  91. spin_lock_init(&sas_ha->phy_port_lock);
  92. sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
  93. if (sas_ha->lldd_queue_size == 0)
  94. sas_ha->lldd_queue_size = 1;
  95. else if (sas_ha->lldd_queue_size == -1)
  96. sas_ha->lldd_queue_size = 128; /* Sanity */
  97. sas_ha->state = SAS_HA_REGISTERED;
  98. spin_lock_init(&sas_ha->state_lock);
  99. error = sas_register_phys(sas_ha);
  100. if (error) {
  101. printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
  102. return error;
  103. }
  104. error = sas_register_ports(sas_ha);
  105. if (error) {
  106. printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
  107. goto Undo_phys;
  108. }
  109. error = sas_init_events(sas_ha);
  110. if (error) {
  111. printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
  112. goto Undo_ports;
  113. }
  114. if (sas_ha->lldd_max_execute_num > 1) {
  115. error = sas_init_queue(sas_ha);
  116. if (error) {
  117. printk(KERN_NOTICE "couldn't start queue thread:%d, "
  118. "running in direct mode\n", error);
  119. sas_ha->lldd_max_execute_num = 1;
  120. }
  121. }
  122. INIT_LIST_HEAD(&sas_ha->eh_done_q);
  123. return 0;
  124. Undo_ports:
  125. sas_unregister_ports(sas_ha);
  126. Undo_phys:
  127. return error;
  128. }
  129. int sas_unregister_ha(struct sas_ha_struct *sas_ha)
  130. {
  131. unsigned long flags;
  132. /* Set the state to unregistered to avoid further
  133. * events to be queued */
  134. spin_lock_irqsave(&sas_ha->state_lock, flags);
  135. sas_ha->state = SAS_HA_UNREGISTERED;
  136. spin_unlock_irqrestore(&sas_ha->state_lock, flags);
  137. scsi_flush_work(sas_ha->core.shost);
  138. sas_unregister_ports(sas_ha);
  139. if (sas_ha->lldd_max_execute_num > 1) {
  140. sas_shutdown_queue(sas_ha);
  141. sas_ha->lldd_max_execute_num = 1;
  142. }
  143. return 0;
  144. }
  145. static int sas_get_linkerrors(struct sas_phy *phy)
  146. {
  147. if (scsi_is_sas_phy_local(phy))
  148. /* FIXME: we have no local phy stats
  149. * gathering at this time */
  150. return -EINVAL;
  151. return sas_smp_get_phy_events(phy);
  152. }
  153. int sas_phy_enable(struct sas_phy *phy, int enable)
  154. {
  155. int ret;
  156. enum phy_func command;
  157. if (enable)
  158. command = PHY_FUNC_LINK_RESET;
  159. else
  160. command = PHY_FUNC_DISABLE;
  161. if (scsi_is_sas_phy_local(phy)) {
  162. struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
  163. struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
  164. struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
  165. struct sas_internal *i =
  166. to_sas_internal(sas_ha->core.shost->transportt);
  167. if (!enable) {
  168. sas_phy_disconnected(asd_phy);
  169. sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
  170. }
  171. ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
  172. } else {
  173. struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
  174. struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
  175. ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
  176. }
  177. return ret;
  178. }
  179. int sas_phy_reset(struct sas_phy *phy, int hard_reset)
  180. {
  181. int ret;
  182. enum phy_func reset_type;
  183. if (hard_reset)
  184. reset_type = PHY_FUNC_HARD_RESET;
  185. else
  186. reset_type = PHY_FUNC_LINK_RESET;
  187. if (scsi_is_sas_phy_local(phy)) {
  188. struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
  189. struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
  190. struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
  191. struct sas_internal *i =
  192. to_sas_internal(sas_ha->core.shost->transportt);
  193. ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
  194. } else {
  195. struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
  196. struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
  197. ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
  198. }
  199. return ret;
  200. }
  201. int sas_set_phy_speed(struct sas_phy *phy,
  202. struct sas_phy_linkrates *rates)
  203. {
  204. int ret;
  205. if ((rates->minimum_linkrate &&
  206. rates->minimum_linkrate > phy->maximum_linkrate) ||
  207. (rates->maximum_linkrate &&
  208. rates->maximum_linkrate < phy->minimum_linkrate))
  209. return -EINVAL;
  210. if (rates->minimum_linkrate &&
  211. rates->minimum_linkrate < phy->minimum_linkrate_hw)
  212. rates->minimum_linkrate = phy->minimum_linkrate_hw;
  213. if (rates->maximum_linkrate &&
  214. rates->maximum_linkrate > phy->maximum_linkrate_hw)
  215. rates->maximum_linkrate = phy->maximum_linkrate_hw;
  216. if (scsi_is_sas_phy_local(phy)) {
  217. struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
  218. struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
  219. struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
  220. struct sas_internal *i =
  221. to_sas_internal(sas_ha->core.shost->transportt);
  222. ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
  223. rates);
  224. } else {
  225. struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
  226. struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
  227. ret = sas_smp_phy_control(ddev, phy->number,
  228. PHY_FUNC_LINK_RESET, rates);
  229. }
  230. return ret;
  231. }
  232. static struct sas_function_template sft = {
  233. .phy_enable = sas_phy_enable,
  234. .phy_reset = sas_phy_reset,
  235. .set_phy_speed = sas_set_phy_speed,
  236. .get_linkerrors = sas_get_linkerrors,
  237. .smp_handler = sas_smp_handler,
  238. };
  239. struct scsi_transport_template *
  240. sas_domain_attach_transport(struct sas_domain_function_template *dft)
  241. {
  242. struct scsi_transport_template *stt = sas_attach_transport(&sft);
  243. struct sas_internal *i;
  244. if (!stt)
  245. return stt;
  246. i = to_sas_internal(stt);
  247. i->dft = dft;
  248. stt->create_work_queue = 1;
  249. stt->eh_timed_out = sas_scsi_timed_out;
  250. stt->eh_strategy_handler = sas_scsi_recover_host;
  251. return stt;
  252. }
  253. EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
  254. void sas_domain_release_transport(struct scsi_transport_template *stt)
  255. {
  256. sas_release_transport(stt);
  257. }
  258. EXPORT_SYMBOL_GPL(sas_domain_release_transport);
  259. /* ---------- SAS Class register/unregister ---------- */
  260. static int __init sas_class_init(void)
  261. {
  262. sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
  263. if (!sas_task_cache)
  264. return -ENOMEM;
  265. return 0;
  266. }
  267. static void __exit sas_class_exit(void)
  268. {
  269. kmem_cache_destroy(sas_task_cache);
  270. }
  271. MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
  272. MODULE_DESCRIPTION("SAS Transport Layer");
  273. MODULE_LICENSE("GPL v2");
  274. module_init(sas_class_init);
  275. module_exit(sas_class_exit);
  276. EXPORT_SYMBOL_GPL(sas_register_ha);
  277. EXPORT_SYMBOL_GPL(sas_unregister_ha);