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); 318