drivers/scsi/libsas/sas_init.c

   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
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/device.h>
  30 #include <linux/spinlock.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35
  36 #include "sas_internal.h"
  37
  38 #include "../scsi_sas_internal.h"
  39
  40 static struct kmem_cache *sas_task_cache;
  41
  42 struct sas_task *sas_alloc_task(gfp_t flags)
  43 {
  44         struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
  45
  46         if (task) {
  47                 INIT_LIST_HEAD(&task->list);
  48                 spin_lock_init(&task->task_state_lock);
  49                 task->task_state_flags = SAS_TASK_STATE_PENDING;
  50                 init_timer(&task->timer);
  51                 init_completion(&task->completion);
  52         }
  53
  54         return task;
  55 }
  56 EXPORT_SYMBOL_GPL(sas_alloc_task);
  57
  58 void sas_free_task(struct sas_task *task)
  59 {
  60         if (task) {
  61                 BUG_ON(!list_empty(&task->list));
  62                 kmem_cache_free(sas_task_cache, task);
  63         }
  64 }
  65 EXPORT_SYMBOL_GPL(sas_free_task);
  66
  67 /*------------ SAS addr hash -----------*/
  68 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
  69 {
  70         const u32 poly = 0x00DB2777;
  71         u32     r = 0;
  72         int     i;
  73
  74         for (i = 0; i < 8; i++) {
  75                 int b;
  76                 for (b = 7; b >= 0; b--) {
  77                         r <<= 1;
  78                         if ((1 << b) & sas_addr[i]) {
  79                                 if (!(r & 0x01000000))
  80                                         r ^= poly;
  81                         } else if (r & 0x01000000)
  82                                 r ^= poly;
  83                 }
  84         }
  85
  86         hashed[0] = (r >> 16) & 0xFF;
  87         hashed[1] = (r >> 8) & 0xFF ;
  88         hashed[2] = r & 0xFF;
  89 }
  90
  91
  92 /* ---------- HA events ---------- */
  93
  94 void sas_hae_reset(struct work_struct *work)
  95 {
  96         struct sas_ha_event *ev =
  97                 container_of(work, struct sas_ha_event, work);
  98         struct sas_ha_struct *ha = ev->ha;
  99
 100         sas_begin_event(HAE_RESET, &ha->event_lock,
 101                         &ha->pending);
 102 }
 103
 104 int sas_register_ha(struct sas_ha_struct *sas_ha)
 105 {
 106         int error = 0;
 107
 108         spin_lock_init(&sas_ha->phy_port_lock);
 109         sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
 110
 111         if (sas_ha->lldd_queue_size == 0)
 112                 sas_ha->lldd_queue_size = 1;
 113         else if (sas_ha->lldd_queue_size == -1)
 114                 sas_ha->lldd_queue_size = 128; /* Sanity */
 115
 116         sas_ha->state = SAS_HA_REGISTERED;
 117         spin_lock_init(&sas_ha->state_lock);
 118
 119         error = sas_register_phys(sas_ha);
 120         if (error) {
 121                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
 122                 return error;
 123         }
 124
 125         error = sas_register_ports(sas_ha);
 126         if (error) {
 127                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
 128                 goto Undo_phys;
 129         }
 130
 131         error = sas_init_events(sas_ha);
 132         if (error) {
 133                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
 134                 goto Undo_ports;
 135         }
 136
 137         if (sas_ha->lldd_max_execute_num > 1) {
 138                 error = sas_init_queue(sas_ha);
 139                 if (error) {
 140                         printk(KERN_NOTICE "couldn't start queue thread:%d, "
 141                                "running in direct mode\n", error);
 142                         sas_ha->lldd_max_execute_num = 1;
 143                 }
 144         }
 145
 146         INIT_LIST_HEAD(&sas_ha->eh_done_q);
 147
 148         return 0;
 149
 150 Undo_ports:
 151         sas_unregister_ports(sas_ha);
 152 Undo_phys:
 153
 154         return error;
 155 }
 156
 157 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 158 {
 159         unsigned long flags;
 160
 161         /* Set the state to unregistered to avoid further
 162          * events to be queued */
 163         spin_lock_irqsave(&sas_ha->state_lock, flags);
 164         sas_ha->state = SAS_HA_UNREGISTERED;
 165         spin_unlock_irqrestore(&sas_ha->state_lock, flags);
 166         scsi_flush_work(sas_ha->core.shost);
 167
 168         sas_unregister_ports(sas_ha);
 169
 170         if (sas_ha->lldd_max_execute_num > 1) {
 171                 sas_shutdown_queue(sas_ha);
 172                 sas_ha->lldd_max_execute_num = 1;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int sas_get_linkerrors(struct sas_phy *phy)
 179 {
 180         if (scsi_is_sas_phy_local(phy))
 181                 /* FIXME: we have no local phy stats
 182                  * gathering at this time */
 183                 return -EINVAL;
 184
 185         return sas_smp_get_phy_events(phy);
 186 }
 187
 188 int sas_phy_enable(struct sas_phy *phy, int enable)
 189 {
 190         int ret;
 191         enum phy_func command;
 192
 193         if (enable)
 194                 command = PHY_FUNC_LINK_RESET;
 195         else
 196                 command = PHY_FUNC_DISABLE;
 197
 198         if (scsi_is_sas_phy_local(phy)) {
 199                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 200                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 201                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 202                 struct sas_internal *i =
 203                         to_sas_internal(sas_ha->core.shost->transportt);
 204
 205                 if (!enable) {
 206                         sas_phy_disconnected(asd_phy);
 207                         sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
 208                 }
 209                 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
 210         } else {
 211                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 212                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 213                 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
 214         }
 215         return ret;
 216 }
 217
 218 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 219 {
 220         int ret;
 221         enum phy_func reset_type;
 222
 223         if (hard_reset)
 224                 reset_type = PHY_FUNC_HARD_RESET;
 225         else
 226                 reset_type = PHY_FUNC_LINK_RESET;
 227
 228         if (scsi_is_sas_phy_local(phy)) {
 229                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 230                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 231                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 232                 struct sas_internal *i =
 233                         to_sas_internal(sas_ha->core.shost->transportt);
 234
 235                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 236         } else {
 237                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 238                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 239                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 240         }
 241         return ret;
 242 }
 243
 244 int sas_set_phy_speed(struct sas_phy *phy,
 245                       struct sas_phy_linkrates *rates)
 246 {
 247         int ret;
 248
 249         if ((rates->minimum_linkrate &&
 250              rates->minimum_linkrate > phy->maximum_linkrate) ||
 251             (rates->maximum_linkrate &&
 252              rates->maximum_linkrate < phy->minimum_linkrate))
 253                 return -EINVAL;
 254
 255         if (rates->minimum_linkrate &&
 256             rates->minimum_linkrate < phy->minimum_linkrate_hw)
 257                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
 258
 259         if (rates->maximum_linkrate &&
 260             rates->maximum_linkrate > phy->maximum_linkrate_hw)
 261                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
 262
 263         if (scsi_is_sas_phy_local(phy)) {
 264                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 265                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 266                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 267                 struct sas_internal *i =
 268                         to_sas_internal(sas_ha->core.shost->transportt);
 269
 270                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
 271                                                rates);
 272         } else {
 273                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 274                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 275                 ret = sas_smp_phy_control(ddev, phy->number,
 276                                           PHY_FUNC_LINK_RESET, rates);
 277
 278         }
 279
 280         return ret;
 281 }
 282
 283 static struct sas_function_template sft = {
 284         .phy_enable = sas_phy_enable,
 285         .phy_reset = sas_phy_reset,
 286         .set_phy_speed = sas_set_phy_speed,
 287         .get_linkerrors = sas_get_linkerrors,
 288         .smp_handler = sas_smp_handler,
 289 };
 290
 291 struct scsi_transport_template *
 292 sas_domain_attach_transport(struct sas_domain_function_template *dft)
 293 {
 294         struct scsi_transport_template *stt = sas_attach_transport(&sft);
 295         struct sas_internal *i;
 296
 297         if (!stt)
 298                 return stt;
 299
 300         i = to_sas_internal(stt);
 301         i->dft = dft;
 302         stt->create_work_queue = 1;
 303         stt->eh_timed_out = sas_scsi_timed_out;
 304         stt->eh_strategy_handler = sas_scsi_recover_host;
 305
 306         return stt;
 307 }
 308 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 309
 310
 311 void sas_domain_release_transport(struct scsi_transport_template *stt)
 312 {
 313         sas_release_transport(stt);
 314 }
 315 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 316
 317 /* ---------- SAS Class register/unregister ---------- */
 318
 319 static int __init sas_class_init(void)
 320 {
 321         sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
 322         if (!sas_task_cache)
 323                 return -ENOMEM;
 324
 325         return 0;
 326 }
 327
 328 static void __exit sas_class_exit(void)
 329 {
 330         kmem_cache_destroy(sas_task_cache);
 331 }
 332
 333 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
 334 MODULE_DESCRIPTION("SAS Transport Layer");
 335 MODULE_LICENSE("GPL v2");
 336
 337 module_init(sas_class_init);
 338 module_exit(sas_class_exit);
 339
 340 EXPORT_SYMBOL_GPL(sas_register_ha);
 341 EXPORT_SYMBOL_GPL(sas_unregister_ha);