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); 317