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(void *data)
  69 {
  70         struct sas_ha_struct *ha = data;
  71
  72         sas_begin_event(HAE_RESET, &ha->event_lock,
  73                         &ha->pending);
  74 }
  75
  76 int sas_register_ha(struct sas_ha_struct *sas_ha)
  77 {
  78         int error = 0;
  79
  80         spin_lock_init(&sas_ha->phy_port_lock);
  81         sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
  82
  83         if (sas_ha->lldd_queue_size == 0)
  84                 sas_ha->lldd_queue_size = 1;
  85         else if (sas_ha->lldd_queue_size == -1)
  86                 sas_ha->lldd_queue_size = 128; /* Sanity */
  87
  88         error = sas_register_phys(sas_ha);
  89         if (error) {
  90                 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
  91                 return error;
  92         }
  93
  94         error = sas_register_ports(sas_ha);
  95         if (error) {
  96                 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
  97                 goto Undo_phys;
  98         }
  99
 100         error = sas_init_events(sas_ha);
 101         if (error) {
 102                 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
 103                 goto Undo_ports;
 104         }
 105
 106         if (sas_ha->lldd_max_execute_num > 1) {
 107                 error = sas_init_queue(sas_ha);
 108                 if (error) {
 109                         printk(KERN_NOTICE "couldn't start queue thread:%d, "
 110                                "running in direct mode\n", error);
 111                         sas_ha->lldd_max_execute_num = 1;
 112                 }
 113         }
 114
 115         return 0;
 116
 117 Undo_ports:
 118         sas_unregister_ports(sas_ha);
 119 Undo_phys:
 120
 121         return error;
 122 }
 123
 124 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 125 {
 126         if (sas_ha->lldd_max_execute_num > 1) {
 127                 sas_shutdown_queue(sas_ha);
 128         }
 129
 130         sas_unregister_ports(sas_ha);
 131
 132         return 0;
 133 }
 134
 135 static int sas_get_linkerrors(struct sas_phy *phy)
 136 {
 137         if (scsi_is_sas_phy_local(phy))
 138                 /* FIXME: we have no local phy stats
 139                  * gathering at this time */
 140                 return -EINVAL;
 141
 142         return sas_smp_get_phy_events(phy);
 143 }
 144
 145 static int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 146 {
 147         int ret;
 148         enum phy_func reset_type;
 149
 150         if (hard_reset)
 151                 reset_type = PHY_FUNC_HARD_RESET;
 152         else
 153                 reset_type = PHY_FUNC_LINK_RESET;
 154
 155         if (scsi_is_sas_phy_local(phy)) {
 156                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 157                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 158                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 159                 struct sas_internal *i =
 160                         to_sas_internal(sas_ha->core.shost->transportt);
 161
 162                 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
 163         } else {
 164                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 165                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 166                 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
 167         }
 168         return ret;
 169 }
 170
 171 static int sas_set_phy_speed(struct sas_phy *phy,
 172                              struct sas_phy_linkrates *rates)
 173 {
 174         int ret;
 175
 176         if ((rates->minimum_linkrate &&
 177              rates->minimum_linkrate > phy->maximum_linkrate) ||
 178             (rates->maximum_linkrate &&
 179              rates->maximum_linkrate < phy->minimum_linkrate))
 180                 return -EINVAL;
 181
 182         if (rates->minimum_linkrate &&
 183             rates->minimum_linkrate < phy->minimum_linkrate_hw)
 184                 rates->minimum_linkrate = phy->minimum_linkrate_hw;
 185
 186         if (rates->maximum_linkrate &&
 187             rates->maximum_linkrate > phy->maximum_linkrate_hw)
 188                 rates->maximum_linkrate = phy->maximum_linkrate_hw;
 189
 190         if (scsi_is_sas_phy_local(phy)) {
 191                 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 192                 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 193                 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
 194                 struct sas_internal *i =
 195                         to_sas_internal(sas_ha->core.shost->transportt);
 196
 197                 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
 198                                                rates);
 199         } else {
 200                 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 201                 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
 202                 ret = sas_smp_phy_control(ddev, phy->number,
 203                                           PHY_FUNC_LINK_RESET, rates);
 204
 205         }
 206
 207         return ret;
 208 }
 209
 210 static struct sas_function_template sft = {
 211         .phy_reset = sas_phy_reset,
 212         .set_phy_speed = sas_set_phy_speed,
 213         .get_linkerrors = sas_get_linkerrors,
 214 };
 215
 216 struct scsi_transport_template *
 217 sas_domain_attach_transport(struct sas_domain_function_template *dft)
 218 {
 219         struct scsi_transport_template *stt = sas_attach_transport(&sft);
 220         struct sas_internal *i;
 221
 222         if (!stt)
 223                 return stt;
 224
 225         i = to_sas_internal(stt);
 226         i->dft = dft;
 227         stt->create_work_queue = 1;
 228         stt->eh_timed_out = sas_scsi_timed_out;
 229         stt->eh_strategy_handler = sas_scsi_recover_host;
 230
 231         return stt;
 232 }
 233 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
 234
 235
 236 void sas_domain_release_transport(struct scsi_transport_template *stt)
 237 {
 238         sas_release_transport(stt);
 239 }
 240 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 241
 242 /* ---------- SAS Class register/unregister ---------- */
 243
 244 static int __init sas_class_init(void)
 245 {
 246         sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
 247                                            0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 248         if (!sas_task_cache)
 249                 return -ENOMEM;
 250
 251         return 0;
 252 }
 253
 254 static void __exit sas_class_exit(void)
 255 {
 256         kmem_cache_destroy(sas_task_cache);
 257 }
 258
 259 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
 260 MODULE_DESCRIPTION("SAS Transport Layer");
 261 MODULE_LICENSE("GPL v2");
 262
 263 module_init(sas_class_init);
 264 module_exit(sas_class_exit);
 265
 266 EXPORT_SYMBOL_GPL(sas_register_ha);
 267 EXPORT_SYMBOL_GPL(sas_unregister_ha);