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                 spin_lock_init(&task->task_state_lock);
  49                 task->task_state_flags = SAS_TASK_STATE_PENDING;
  50         }
  51
  52         return task;
  53 }
  54 EXPORT_SYMBOL_GPL(sas_alloc_task);
  55
  56 struct sas_task *sas_alloc_slow_task(gfp_t flags)
  57 {
  58         struct sas_task *task = sas_alloc_task(flags);
  59         struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
  60
  61         if (!task || !slow) {
  62                 if (task)
  63                         kmem_cache_free(sas_task_cache, task);
  64                 kfree(slow);
  65                 return NULL;
  66         }
  67
  68         task->slow_task = slow;
  69         init_timer(&slow->timer);
  70         init_completion(&slow->completion);
  71
  72         return task;
  73 }
  74 EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
  75
  76 void sas_free_task(struct sas_task *task)
  77 {
  78         if (task) {
  79                 kfree(task->slow_task);
  80                 kmem_cache_free(sas_task_cache, task);
  81         }
  82 }
  83 EXPORT_SYMBOL_GPL(sas_free_task);
  84
  85 /*------------ SAS addr hash -----------*/
  86 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
  87 {
  88         const u32 poly = 0x00DB2777;
  89         u32     r = 0;
  90         int     i;
  91
  92         for (i = 0; i < 8; i++) {
  93                 int b;
  94                 for (b = 7; b >= 0; b--) {
  95                         r <<= 1;
  96                         if ((1 << b) & sas_addr[i]) {
  97                                 if (!(r & 0x01000000))
  98                                         r ^= poly;
  99                         } else if (r & 0x01000000)
 100                                 r ^= poly;
 101                 }
 102         }
 103
 104         hashed[0] = (r >> 16) & 0xFF;
 105         hashed[1] = (r >> 8) & 0xFF ;
 106         hashed[2] = r & 0xFF;
 107 }
 108
 109
 110 /* ---------- HA events ---------- */
 111
 112 void sas_hae_reset(struct work_struct *work)
 113 {
 114         struct sas_ha_event *ev = to_sas_ha_event(work);
 115         struct sas_ha_struct *ha = ev->ha;
 116
 117         clear_bit(HAE_RESET, &ha->pending);
 118 }
 119
 120 int sas_register_ha(struct sas_ha_struct *sas_ha)
 121 {
 122         int error = 0;
 123
 124         mutex_init(&sas_ha->disco_mutex);
 125         spin_lock_init(&sas_ha->phy_port_lock);
 126         sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
 127
 128         set_bit(SAS_HA_REGISTERED, &sas_ha->state);
 129         spin_lock_init(&sas_ha->lock);
 130         mutex_init(&sas_ha->drain_mutex);
 131         init_waitqueue_head(&sas_ha->eh_wait_q);
 132         INIT_LIST_HEAD(&sas_ha->defer_q);
 133         INIT_LIST_HEAD(&sas_ha->eh_dev_q);
 134
 135         error = sas_register_phys(sas_ha);
 136         if (error) {
 137                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
 138                 return error;
 139         }
 140
 141         error = sas_register_ports(sas_ha);
 142         if (error) {
 143                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
 144                 goto Undo_phys;
 145         }
 146
 147         error = sas_init_events(sas_ha);
 148         if (error) {
 149                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
 150                 goto Undo_ports;
 151         }
 152
 153         INIT_LIST_HEAD(&sas_ha->eh_done_q);
 154         INIT_LIST_HEAD(&sas_ha->eh_ata_q);
 155
 156         return 0;
 157
 158 Undo_ports:
 159         sas_unregister_ports(sas_ha);
 160 Undo_phys:
 161
 162         return error;
 163 }
 164
 165 static void sas_disable_events(struct sas_ha_struct *sas_ha)
 166 {
 167         /* Set the state to unregistered to avoid further unchained
 168          * events to be queued, and flush any in-progress drainers
 169          */
 170         mutex_lock(&sas_ha->drain_mutex);
 171         spin_lock_irq(&sas_ha->lock);
 172         clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
 173         spin_unlock_irq(&sas_ha->lock);
 174         __sas_drain_work(sas_ha);
 175         mutex_unlock(&sas_ha->drain_mutex);
 176 }
 177
 178 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 179 {
 180         sas_disable_events(sas_ha);
 181         sas_unregister_ports(sas_ha);
 182
 183         /* flush unregistration work */
 184         mutex_lock(&sas_ha->drain_mutex);
 185         __sas_drain_work(sas_ha);
 186         mutex_unlock(&sas_ha->drain_mutex);
 187
 188         return 0;
 189 }
 190
 191 static int sas_get_linkerrors(struct sas_phy *phy)
 192 {
 193         if (scsi_is_sas_phy_local(phy)) {
 194                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 195                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 196                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 197                 struct sas_internal *i =
 198                         to_sas_internal(sas_ha->core.shost->transportt);
 199
 200                 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
 201         }
 202
 203         return sas_smp_get_phy_events(phy);
 204 }
 205
 206 int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
 207 {
 208         struct domain_device *dev = NULL;
 209
 210         /* try to route user requested link resets through libata */
 211         if (asd_phy->port)
 212                 dev = asd_phy->port->port_dev;
 213
 214         /* validate that dev has been probed */
 215         if (dev)
 216                 dev = sas_find_dev_by_rphy(dev->rphy);
 217
 218         if (dev && dev_is_sata(dev)) {
 219                 sas_ata_schedule_reset(dev);
 220                 sas_ata_wait_eh(dev);
 221                 return 0;
 222         }
 223
 224         return -ENODEV;
 225 }
 226
 227 /**
 228  * transport_sas_phy_reset - reset a phy and permit libata to manage the link
 229  *
 230  * phy reset request via sysfs in host workqueue context so we know we
 231  * can block on eh and safely traverse the domain_device topology
 232  */
 233 static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
 234 {
 235         enum phy_func reset_type;
 236
 237         if (hard_reset)
 238                 reset_type = PHY_FUNC_HARD_RESET;
 239         else
 240                 reset_type = PHY_FUNC_LINK_RESET;
 241
 242         if (scsi_is_sas_phy_local(phy)) {
 243                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 244                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 245                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 246                 struct sas_internal *i =
 247                         to_sas_internal(sas_ha->core.shost->transportt);
 248
 249                 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
 250                         return 0;
 251                 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 252         } else {
 253                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 254                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 255                 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
 256
 257                 if (ata_dev && !hard_reset) {
 258                         sas_ata_schedule_reset(ata_dev);
 259                         sas_ata_wait_eh(ata_dev);
 260                         return 0;
 261                 } else
 262                         return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 263         }
 264 }
 265
 266 static int sas_phy_enable(struct sas_phy *phy, int enable)
 267 {
 268         int ret;
 269         enum phy_func cmd;
 270
 271         if (enable)
 272                 cmd = PHY_FUNC_LINK_RESET;
 273         else
 274                 cmd = PHY_FUNC_DISABLE;
 275
 276         if (scsi_is_sas_phy_local(phy)) {
 277                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 278                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 279                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 280                 struct sas_internal *i =
 281                         to_sas_internal(sas_ha->core.shost->transportt);
 282
 283                 if (enable)
 284                         ret = transport_sas_phy_reset(phy, 0);
 285                 else
 286                         ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
 287         } else {
 288                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 289                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 290
 291                 if (enable)
 292                         ret = transport_sas_phy_reset(phy, 0);
 293                 else
 294                         ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
 295         }
 296         return ret;
 297 }
 298
 299 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 300 {
 301         int ret;
 302         enum phy_func reset_type;
 303
 304         if (!phy->enabled)
 305                 return -ENODEV;
 306
 307         if (hard_reset)
 308                 reset_type = PHY_FUNC_HARD_RESET;
 309         else
 310                 reset_type = PHY_FUNC_LINK_RESET;
 311
 312         if (scsi_is_sas_phy_local(phy)) {
 313                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 314                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 315                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 316                 struct sas_internal *i =
 317                         to_sas_internal(sas_ha->core.shost->transportt);
 318
 319                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 320         } else {
 321                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 322                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 323                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 324         }
 325         return ret;
 326 }
 327
 328 int sas_set_phy_speed(struct sas_phy *phy,
 329                       struct sas_phy_linkrates *rates)
 330 {
 331         int ret;
 332
 333         if ((rates->minimum_linkrate &&
 334              rates->minimum_linkrate > phy->maximum_linkrate) ||
 335             (rates->maximum_linkrate &&
 336              rates->maximum_linkrate < phy->minimum_linkrate))
 337                 return -EINVAL;
 338
 339         if (rates->minimum_linkrate &&
 340             rates->minimum_linkrate < phy->minimum_linkrate_hw)
 341                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
 342
 343         if (rates->maximum_linkrate &&
 344             rates->maximum_linkrate > phy->maximum_linkrate_hw)
 345                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
 346
 347         if (scsi_is_sas_phy_local(phy)) {
 348                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 349                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 350                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 351                 struct sas_internal *i =
 352                         to_sas_internal(sas_ha->core.shost->transportt);
 353
 354                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
 355                                                rates);
 356         } else {
 357                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 358                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 359                 ret = sas_smp_phy_control(ddev, phy->number,
 360                                           PHY_FUNC_LINK_RESET, rates);
 361
 362         }
 363
 364         return ret;
 365 }
 366
 367 void sas_prep_resume_ha(struct sas_ha_struct *ha)
 368 {
 369         int i;
 370
 371         set_bit(SAS_HA_REGISTERED, &ha->state);
 372
 373         /* clear out any stale link events/data from the suspension path */
 374         for (i = 0; i < ha->num_phys; i++) {
 375                 struct asd_sas_phy *phy = ha->sas_phy[i];
 376
 377                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 378                 phy->port_events_pending = 0;
 379                 phy->phy_events_pending = 0;
 380                 phy->frame_rcvd_size = 0;
 381         }
 382 }
 383 EXPORT_SYMBOL(sas_prep_resume_ha);
 384
 385 static int phys_suspended(struct sas_ha_struct *ha)
 386 {
 387         int i, rc = 0;
 388
 389         for (i = 0; i < ha->num_phys; i++) {
 390                 struct asd_sas_phy *phy = ha->sas_phy[i];
 391
 392                 if (phy->suspended)
 393                         rc++;
 394         }
 395
 396         return rc;
 397 }
 398
 399 void sas_resume_ha(struct sas_ha_struct *ha)
 400 {
 401         const unsigned long tmo = msecs_to_jiffies(25000);
 402         int i;
 403
 404         /* deform ports on phys that did not resume
 405          * at this point we may be racing the phy coming back (as posted
 406          * by the lldd).  So we post the event and once we are in the
 407          * libsas context check that the phy remains suspended before
 408          * tearing it down.
 409          */
 410         i = phys_suspended(ha);
 411         if (i)
 412                 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
 413                          i, i > 1 ? "s" : "");
 414         wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
 415         for (i = 0; i < ha->num_phys; i++) {
 416                 struct asd_sas_phy *phy = ha->sas_phy[i];
 417
 418                 if (phy->suspended) {
 419                         dev_warn(&phy->phy->dev, "resume timeout\n");
 420                         sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
 421                 }
 422         }
 423
 424         /* all phys are back up or timed out, turn on i/o so we can
 425          * flush out disks that did not return
 426          */
 427         scsi_unblock_requests(ha->core.shost);
 428         sas_drain_work(ha);
 429 }
 430 EXPORT_SYMBOL(sas_resume_ha);
 431
 432 void sas_suspend_ha(struct sas_ha_struct *ha)
 433 {
 434         int i;
 435
 436         sas_disable_events(ha);
 437         scsi_block_requests(ha->core.shost);
 438         for (i = 0; i < ha->num_phys; i++) {
 439                 struct asd_sas_port *port = ha->sas_port[i];
 440
 441                 sas_discover_event(port, DISCE_SUSPEND);
 442         }
 443
 444         /* flush suspend events while unregistered */
 445         mutex_lock(&ha->drain_mutex);
 446         __sas_drain_work(ha);
 447         mutex_unlock(&ha->drain_mutex);
 448 }
 449 EXPORT_SYMBOL(sas_suspend_ha);
 450
 451 static void sas_phy_release(struct sas_phy *phy)
 452 {
 453         kfree(phy->hostdata);
 454         phy->hostdata = NULL;
 455 }
 456
 457 static void phy_reset_work(struct work_struct *work)
 458 {
 459         struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
 460
 461         d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
 462 }
 463
 464 static void phy_enable_work(struct work_struct *work)
 465 {
 466         struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
 467
 468         d->enable_result = sas_phy_enable(d->phy, d->enable);
 469 }
 470
 471 static int sas_phy_setup(struct sas_phy *phy)
 472 {
 473         struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
 474
 475         if (!d)
 476                 return -ENOMEM;
 477
 478         mutex_init(&d->event_lock);
 479         INIT_SAS_WORK(&d->reset_work, phy_reset_work);
 480         INIT_SAS_WORK(&d->enable_work, phy_enable_work);
 481         d->phy = phy;
 482         phy->hostdata = d;
 483
 484         return 0;
 485 }
 486
 487 static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
 488 {
 489         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 490         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 491         struct sas_phy_data *d = phy->hostdata;
 492         int rc;
 493
 494         if (!d)
 495                 return -ENOMEM;
 496
 497         /* libsas workqueue coordinates ata-eh reset with discovery */
 498         mutex_lock(&d->event_lock);
 499         d->reset_result = 0;
 500         d->hard_reset = hard_reset;
 501
 502         spin_lock_irq(&ha->lock);
 503         sas_queue_work(ha, &d->reset_work);
 504         spin_unlock_irq(&ha->lock);
 505
 506         rc = sas_drain_work(ha);
 507         if (rc == 0)
 508                 rc = d->reset_result;
 509         mutex_unlock(&d->event_lock);
 510
 511         return rc;
 512 }
 513
 514 static int queue_phy_enable(struct sas_phy *phy, int enable)
 515 {
 516         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 517         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 518         struct sas_phy_data *d = phy->hostdata;
 519         int rc;
 520
 521         if (!d)
 522                 return -ENOMEM;
 523
 524         /* libsas workqueue coordinates ata-eh reset with discovery */
 525         mutex_lock(&d->event_lock);
 526         d->enable_result = 0;
 527         d->enable = enable;
 528
 529         spin_lock_irq(&ha->lock);
 530         sas_queue_work(ha, &d->enable_work);
 531         spin_unlock_irq(&ha->lock);
 532
 533         rc = sas_drain_work(ha);
 534         if (rc == 0)
 535                 rc = d->enable_result;
 536         mutex_unlock(&d->event_lock);
 537
 538         return rc;
 539 }
 540
 541 static struct sas_function_template sft = {
 542         .phy_enable = queue_phy_enable,
 543         .phy_reset = queue_phy_reset,
 544         .phy_setup = sas_phy_setup,
 545         .phy_release = sas_phy_release,
 546         .set_phy_speed = sas_set_phy_speed,
 547         .get_linkerrors = sas_get_linkerrors,
 548         .smp_handler = sas_smp_handler,
 549 };
 550
 551 struct scsi_transport_template *
 552 sas_domain_attach_transport(struct sas_domain_function_template *dft)
 553 {
 554         struct scsi_transport_template *stt = sas_attach_transport(&sft);
 555         struct sas_internal *i;
 556
 557         if (!stt)
 558                 return stt;
 559
 560         i = to_sas_internal(stt);
 561         i->dft = dft;
 562         stt->create_work_queue = 1;
 563         stt->eh_strategy_handler = sas_scsi_recover_host;
 564
 565         return stt;
 566 }
 567 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 568
 569
 570 void sas_domain_release_transport(struct scsi_transport_template *stt)
 571 {
 572         sas_release_transport(stt);
 573 }
 574 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 575
 576 /* ---------- SAS Class register/unregister ---------- */
 577
 578 static int __init sas_class_init(void)
 579 {
 580         sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
 581         if (!sas_task_cache)
 582                 return -ENOMEM;
 583
 584         return 0;
 585 }
 586
 587 static void __exit sas_class_exit(void)
 588 {
 589         kmem_cache_destroy(sas_task_cache);
 590 }
 591
 592 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
 593 MODULE_DESCRIPTION("SAS Transport Layer");
 594 MODULE_LICENSE("GPL v2");
 595
 596 module_init(sas_class_init);
 597 module_exit(sas_class_exit);
 598
 599 EXPORT_SYMBOL_GPL(sas_register_ha);
 600 EXPORT_SYMBOL_GPL(sas_unregister_ha);