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 kmem_cache_t *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         error = sas_register_phys(sas_ha);
  91         if (error) {
  92                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
  93                 return error;
  94         }
  95
  96         error = sas_register_ports(sas_ha);
  97         if (error) {
  98                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
  99                 goto Undo_phys;
 100         }
 101
 102         error = sas_init_events(sas_ha);
 103         if (error) {
 104                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
 105                 goto Undo_ports;
 106         }
 107
 108         if (sas_ha->lldd_max_execute_num > 1) {
 109                 error = sas_init_queue(sas_ha);
 110                 if (error) {
 111                         printk(KERN_NOTICE "couldn't start queue thread:%d, "
 112                                "running in direct mode\n", error);
 113                         sas_ha->lldd_max_execute_num = 1;
 114                 }
 115         }
 116
 117         return 0;
 118
 119 Undo_ports:
 120         sas_unregister_ports(sas_ha);
 121 Undo_phys:
 122
 123         return error;
 124 }
 125
 126 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 127 {
 128         if (sas_ha->lldd_max_execute_num > 1) {
 129                 sas_shutdown_queue(sas_ha);
 130         }
 131
 132         sas_unregister_ports(sas_ha);
 133
 134         return 0;
 135 }
 136
 137 static int sas_get_linkerrors(struct sas_phy *phy)
 138 {
 139         if (scsi_is_sas_phy_local(phy))
 140                 /* FIXME: we have no local phy stats
 141                  * gathering at this time */
 142                 return -EINVAL;
 143
 144         return sas_smp_get_phy_events(phy);
 145 }
 146
 147 static int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 148 {
 149         int ret;
 150         enum phy_func reset_type;
 151
 152         if (hard_reset)
 153                 reset_type = PHY_FUNC_HARD_RESET;
 154         else
 155                 reset_type = PHY_FUNC_LINK_RESET;
 156
 157         if (scsi_is_sas_phy_local(phy)) {
 158                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 159                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 160                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 161                 struct sas_internal *i =
 162                         to_sas_internal(sas_ha->core.shost->transportt);
 163
 164                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 165         } else {
 166                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 167                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 168                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 169         }
 170         return ret;
 171 }
 172
 173 static int sas_set_phy_speed(struct sas_phy *phy,
 174                              struct sas_phy_linkrates *rates)
 175 {
 176         int ret;
 177
 178         if ((rates->minimum_linkrate &&
 179              rates->minimum_linkrate > phy->maximum_linkrate) ||
 180             (rates->maximum_linkrate &&
 181              rates->maximum_linkrate < phy->minimum_linkrate))
 182                 return -EINVAL;
 183
 184         if (rates->minimum_linkrate &&
 185             rates->minimum_linkrate < phy->minimum_linkrate_hw)
 186                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
 187
 188         if (rates->maximum_linkrate &&
 189             rates->maximum_linkrate > phy->maximum_linkrate_hw)
 190                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
 191
 192         if (scsi_is_sas_phy_local(phy)) {
 193                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 194                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 195                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 196                 struct sas_internal *i =
 197                         to_sas_internal(sas_ha->core.shost->transportt);
 198
 199                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
 200                                                rates);
 201         } else {
 202                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 203                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 204                 ret = sas_smp_phy_control(ddev, phy->number,
 205                                           PHY_FUNC_LINK_RESET, rates);
 206
 207         }
 208
 209         return ret;
 210 }
 211
 212 static struct sas_function_template sft = {
 213         .phy_reset = sas_phy_reset,
 214         .set_phy_speed = sas_set_phy_speed,
 215         .get_linkerrors = sas_get_linkerrors,
 216 };
 217
 218 struct scsi_transport_template *
 219 sas_domain_attach_transport(struct sas_domain_function_template *dft)
 220 {
 221         struct scsi_transport_template *stt = sas_attach_transport(&sft);
 222         struct sas_internal *i;
 223
 224         if (!stt)
 225                 return stt;
 226
 227         i = to_sas_internal(stt);
 228         i->dft = dft;
 229         stt->create_work_queue = 1;
 230         stt->eh_timed_out = sas_scsi_timed_out;
 231         stt->eh_strategy_handler = sas_scsi_recover_host;
 232
 233         return stt;
 234 }
 235 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 236
 237
 238 void sas_domain_release_transport(struct scsi_transport_template *stt)
 239 {
 240         sas_release_transport(stt);
 241 }
 242 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 243
 244 /* ---------- SAS Class register/unregister ---------- */
 245
 246 static int __init sas_class_init(void)
 247 {
 248         sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
 249                                            0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 250         if (!sas_task_cache)
 251                 return -ENOMEM;
 252
 253         return 0;
 254 }
 255
 256 static void __exit sas_class_exit(void)
 257 {
 258         kmem_cache_destroy(sas_task_cache);
 259 }
 260
 261 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
 262 MODULE_DESCRIPTION("SAS Transport Layer");
 263 MODULE_LICENSE("GPL v2");
 264
 265 module_init(sas_class_init);
 266 module_exit(sas_class_exit);
 267
 268 EXPORT_SYMBOL_GPL(sas_register_ha);
 269 EXPORT_SYMBOL_GPL(sas_unregister_ha);