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