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/sas_ata.h>
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_transport.h>
  35 #include <scsi/scsi_transport_sas.h>
  36
  37 #include "sas_internal.h"
  38
  39 #include "../scsi_sas_internal.h"
  40
  41 static struct kmem_cache *sas_task_cache;
  42
  43 struct sas_task *sas_alloc_task(gfp_t flags)
  44 {
  45         struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
  46
  47         if (task) {
  48                 INIT_LIST_HEAD(&task->list);
  49                 spin_lock_init(&task->task_state_lock);
  50                 task->task_state_flags = SAS_TASK_STATE_PENDING;
  51                 init_timer(&task->timer);
  52                 init_completion(&task->completion);
  53         }
  54
  55         return task;
  56 }
  57 EXPORT_SYMBOL_GPL(sas_alloc_task);
  58
  59 void sas_free_task(struct sas_task *task)
  60 {
  61         if (task) {
  62                 BUG_ON(!list_empty(&task->list));
  63                 kmem_cache_free(sas_task_cache, task);
  64         }
  65 }
  66 EXPORT_SYMBOL_GPL(sas_free_task);
  67
  68 /*------------ SAS addr hash -----------*/
  69 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
  70 {
  71         const u32 poly = 0x00DB2777;
  72         u32     r = 0;
  73         int     i;
  74
  75         for (i = 0; i < 8; i++) {
  76                 int b;
  77                 for (b = 7; b >= 0; b--) {
  78                         r <<= 1;
  79                         if ((1 << b) & sas_addr[i]) {
  80                                 if (!(r & 0x01000000))
  81                                         r ^= poly;
  82                         } else if (r & 0x01000000)
  83                                 r ^= poly;
  84                 }
  85         }
  86
  87         hashed[0] = (r >> 16) & 0xFF;
  88         hashed[1] = (r >> 8) & 0xFF ;
  89         hashed[2] = r & 0xFF;
  90 }
  91
  92
  93 /* ---------- HA events ---------- */
  94
  95 void sas_hae_reset(struct work_struct *work)
  96 {
  97         struct sas_ha_event *ev =
  98                 container_of(work, struct sas_ha_event, work);
  99         struct sas_ha_struct *ha = ev->ha;
 100
 101         clear_bit(HAE_RESET, &ha->pending);
 102 }
 103
 104 int sas_register_ha(struct sas_ha_struct *sas_ha)
 105 {
 106         int error = 0;
 107
 108         mutex_init(&sas_ha->disco_mutex);
 109         spin_lock_init(&sas_ha->phy_port_lock);
 110         sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
 111
 112         if (sas_ha->lldd_queue_size == 0)
 113                 sas_ha->lldd_queue_size = 1;
 114         else if (sas_ha->lldd_queue_size == -1)
 115                 sas_ha->lldd_queue_size = 128; /* Sanity */
 116
 117         set_bit(SAS_HA_REGISTERED, &sas_ha->state);
 118         spin_lock_init(&sas_ha->state_lock);
 119         mutex_init(&sas_ha->drain_mutex);
 120         INIT_LIST_HEAD(&sas_ha->defer_q);
 121
 122         error = sas_register_phys(sas_ha);
 123         if (error) {
 124                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
 125                 return error;
 126         }
 127
 128         error = sas_register_ports(sas_ha);
 129         if (error) {
 130                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
 131                 goto Undo_phys;
 132         }
 133
 134         error = sas_init_events(sas_ha);
 135         if (error) {
 136                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
 137                 goto Undo_ports;
 138         }
 139
 140         if (sas_ha->lldd_max_execute_num > 1) {
 141                 error = sas_init_queue(sas_ha);
 142                 if (error) {
 143                         printk(KERN_NOTICE "couldn't start queue thread:%d, "
 144                                "running in direct mode\n", error);
 145                         sas_ha->lldd_max_execute_num = 1;
 146                 }
 147         }
 148
 149         INIT_LIST_HEAD(&sas_ha->eh_done_q);
 150         INIT_LIST_HEAD(&sas_ha->eh_ata_q);
 151
 152         return 0;
 153
 154 Undo_ports:
 155         sas_unregister_ports(sas_ha);
 156 Undo_phys:
 157
 158         return error;
 159 }
 160
 161 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 162 {
 163         unsigned long flags;
 164
 165         /* Set the state to unregistered to avoid further unchained
 166          * events to be queued
 167          */
 168         spin_lock_irqsave(&sas_ha->state_lock, flags);
 169         clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
 170         spin_unlock_irqrestore(&sas_ha->state_lock, flags);
 171         sas_drain_work(sas_ha);
 172
 173         sas_unregister_ports(sas_ha);
 174         sas_drain_work(sas_ha);
 175
 176         if (sas_ha->lldd_max_execute_num > 1) {
 177                 sas_shutdown_queue(sas_ha);
 178                 sas_ha->lldd_max_execute_num = 1;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int sas_get_linkerrors(struct sas_phy *phy)
 185 {
 186         if (scsi_is_sas_phy_local(phy)) {
 187                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 188                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 189                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 190                 struct sas_internal *i =
 191                         to_sas_internal(sas_ha->core.shost->transportt);
 192
 193                 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
 194         }
 195
 196         return sas_smp_get_phy_events(phy);
 197 }
 198
 199 /**
 200  * transport_sas_phy_reset - reset a phy and permit libata to manage the link
 201  *
 202  * phy reset request via sysfs in host workqueue context so we know we
 203  * can block on eh and safely traverse the domain_device topology
 204  */
 205 static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
 206 {
 207         int ret;
 208         enum phy_func reset_type;
 209
 210         if (hard_reset)
 211                 reset_type = PHY_FUNC_HARD_RESET;
 212         else
 213                 reset_type = PHY_FUNC_LINK_RESET;
 214
 215         if (scsi_is_sas_phy_local(phy)) {
 216                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 217                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 218                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 219                 struct sas_internal *i =
 220                         to_sas_internal(sas_ha->core.shost->transportt);
 221                 struct domain_device *dev = NULL;
 222
 223                 if (asd_phy->port)
 224                         dev = asd_phy->port->port_dev;
 225
 226                 /* validate that dev has been probed */
 227                 if (dev)
 228                         dev = sas_find_dev_by_rphy(dev->rphy);
 229
 230                 if (dev && dev_is_sata(dev) && !hard_reset) {
 231                         sas_ata_schedule_reset(dev);
 232                         sas_ata_wait_eh(dev);
 233                         ret = 0;
 234                 } else
 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                 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
 240
 241                 if (ata_dev && !hard_reset) {
 242                         sas_ata_schedule_reset(ata_dev);
 243                         sas_ata_wait_eh(ata_dev);
 244                         ret = 0;
 245                 } else
 246                         ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 247         }
 248
 249         return ret;
 250 }
 251
 252 int sas_phy_enable(struct sas_phy *phy, int enable)
 253 {
 254         int ret;
 255         enum phy_func command;
 256
 257         if (enable)
 258                 command = PHY_FUNC_LINK_RESET;
 259         else
 260                 command = PHY_FUNC_DISABLE;
 261
 262         if (scsi_is_sas_phy_local(phy)) {
 263                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 264                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 265                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 266                 struct sas_internal *i =
 267                         to_sas_internal(sas_ha->core.shost->transportt);
 268
 269                 if (!enable) {
 270                         sas_phy_disconnected(asd_phy);
 271                         sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
 272                 }
 273                 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
 274         } else {
 275                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 276                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 277                 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
 278         }
 279         return ret;
 280 }
 281
 282 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 283 {
 284         int ret;
 285         enum phy_func reset_type;
 286
 287         if (hard_reset)
 288                 reset_type = PHY_FUNC_HARD_RESET;
 289         else
 290                 reset_type = PHY_FUNC_LINK_RESET;
 291
 292         if (scsi_is_sas_phy_local(phy)) {
 293                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 294                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 295                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 296                 struct sas_internal *i =
 297                         to_sas_internal(sas_ha->core.shost->transportt);
 298
 299                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 300         } else {
 301                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 302                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 303                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 304         }
 305         return ret;
 306 }
 307
 308 int sas_set_phy_speed(struct sas_phy *phy,
 309                       struct sas_phy_linkrates *rates)
 310 {
 311         int ret;
 312
 313         if ((rates->minimum_linkrate &&
 314              rates->minimum_linkrate > phy->maximum_linkrate) ||
 315             (rates->maximum_linkrate &&
 316              rates->maximum_linkrate < phy->minimum_linkrate))
 317                 return -EINVAL;
 318
 319         if (rates->minimum_linkrate &&
 320             rates->minimum_linkrate < phy->minimum_linkrate_hw)
 321                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
 322
 323         if (rates->maximum_linkrate &&
 324             rates->maximum_linkrate > phy->maximum_linkrate_hw)
 325                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
 326
 327         if (scsi_is_sas_phy_local(phy)) {
 328                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 329                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 330                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 331                 struct sas_internal *i =
 332                         to_sas_internal(sas_ha->core.shost->transportt);
 333
 334                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
 335                                                rates);
 336         } else {
 337                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 338                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 339                 ret = sas_smp_phy_control(ddev, phy->number,
 340                                           PHY_FUNC_LINK_RESET, rates);
 341
 342         }
 343
 344         return ret;
 345 }
 346
 347 static void sas_phy_release(struct sas_phy *phy)
 348 {
 349         kfree(phy->hostdata);
 350         phy->hostdata = NULL;
 351 }
 352
 353 static void phy_reset_work(struct work_struct *work)
 354 {
 355         struct sas_phy_data *d = container_of(work, typeof(*d), reset_work);
 356
 357         d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
 358 }
 359
 360 static int sas_phy_setup(struct sas_phy *phy)
 361 {
 362         struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
 363
 364         if (!d)
 365                 return -ENOMEM;
 366
 367         mutex_init(&d->event_lock);
 368         INIT_WORK(&d->reset_work, phy_reset_work);
 369         d->phy = phy;
 370         phy->hostdata = d;
 371
 372         return 0;
 373 }
 374
 375 static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
 376 {
 377         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 378         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 379         struct sas_phy_data *d = phy->hostdata;
 380         int rc;
 381
 382         if (!d)
 383                 return -ENOMEM;
 384
 385         /* libsas workqueue coordinates ata-eh reset with discovery */
 386         mutex_lock(&d->event_lock);
 387         d->reset_result = 0;
 388         d->hard_reset = hard_reset;
 389
 390         spin_lock_irq(&ha->state_lock);
 391         sas_queue_work(ha, &d->reset_work);
 392         spin_unlock_irq(&ha->state_lock);
 393
 394         rc = sas_drain_work(ha);
 395         if (rc == 0)
 396                 rc = d->reset_result;
 397         mutex_unlock(&d->event_lock);
 398
 399         return rc;
 400 }
 401
 402 static struct sas_function_template sft = {
 403         .phy_enable = sas_phy_enable,
 404         .phy_reset = queue_phy_reset,
 405         .phy_setup = sas_phy_setup,
 406         .phy_release = sas_phy_release,
 407         .set_phy_speed = sas_set_phy_speed,
 408         .get_linkerrors = sas_get_linkerrors,
 409         .smp_handler = sas_smp_handler,
 410 };
 411
 412 struct scsi_transport_template *
 413 sas_domain_attach_transport(struct sas_domain_function_template *dft)
 414 {
 415         struct scsi_transport_template *stt = sas_attach_transport(&sft);
 416         struct sas_internal *i;
 417
 418         if (!stt)
 419                 return stt;
 420
 421         i = to_sas_internal(stt);
 422         i->dft = dft;
 423         stt->create_work_queue = 1;
 424         stt->eh_timed_out = sas_scsi_timed_out;
 425         stt->eh_strategy_handler = sas_scsi_recover_host;
 426
 427         return stt;
 428 }
 429 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 430
 431
 432 void sas_domain_release_transport(struct scsi_transport_template *stt)
 433 {
 434         sas_release_transport(stt);
 435 }
 436 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 437
 438 /* ---------- SAS Class register/unregister ---------- */
 439
 440 static int __init sas_class_init(void)
 441 {
 442         sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
 443         if (!sas_task_cache)
 444                 return -ENOMEM;
 445
 446         return 0;
 447 }
 448
 449 static void __exit sas_class_exit(void)
 450 {
 451         kmem_cache_destroy(sas_task_cache);
 452 }
 453
 454 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
 455 MODULE_DESCRIPTION("SAS Transport Layer");
 456 MODULE_LICENSE("GPL v2");
 457
 458 module_init(sas_class_init);
 459 module_exit(sas_class_exit);
 460
 461 EXPORT_SYMBOL_GPL(sas_register_ha);
 462 EXPORT_SYMBOL_GPL(sas_unregister_ha);