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