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 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 INIT_LIST_HEAD(&sas_ha->eh_done_q); 118 119 return 0; 120 121 Undo_ports: 122 sas_unregister_ports(sas_ha); 123 Undo_phys: 124 125 return error; 126 } 127 128 int sas_unregister_ha(struct sas_ha_struct *sas_ha) 129 { 130 if (sas_ha->lldd_max_execute_num > 1) { 131 sas_shutdown_queue(sas_ha); 132 } 133 134 sas_unregister_ports(sas_ha); 135 136 return 0; 137 } 138 139 static int sas_get_linkerrors(struct sas_phy *phy) 140 { 141 if (scsi_is_sas_phy_local(phy)) 142 /* FIXME: we have no local phy stats 143 * gathering at this time */ 144 return -EINVAL; 145 146 return sas_smp_get_phy_events(phy); 147 } 148 149 int sas_phy_enable(struct sas_phy *phy, int enable) 150 { 151 int ret; 152 enum phy_func command; 153 154 if (enable) 155 command = PHY_FUNC_LINK_RESET; 156 else 157 command = PHY_FUNC_DISABLE; 158 159 if (scsi_is_sas_phy_local(phy)) { 160 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 161 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 162 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 163 struct sas_internal *i = 164 to_sas_internal(sas_ha->core.shost->transportt); 165 166 if (!enable) { 167 sas_phy_disconnected(asd_phy); 168 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL); 169 } 170 ret = i->dft->lldd_control_phy(asd_phy, command, NULL); 171 } else { 172 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 173 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 174 ret = sas_smp_phy_control(ddev, phy->number, command, NULL); 175 } 176 return ret; 177 } 178 179 int sas_phy_reset(struct sas_phy *phy, int hard_reset) 180 { 181 int ret; 182 enum phy_func reset_type; 183 184 if (hard_reset) 185 reset_type = PHY_FUNC_HARD_RESET; 186 else 187 reset_type = PHY_FUNC_LINK_RESET; 188 189 if (scsi_is_sas_phy_local(phy)) { 190 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 191 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 192 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 193 struct sas_internal *i = 194 to_sas_internal(sas_ha->core.shost->transportt); 195 196 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 197 } else { 198 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 199 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 200 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 201 } 202 return ret; 203 } 204 205 int sas_set_phy_speed(struct sas_phy *phy, 206 struct sas_phy_linkrates *rates) 207 { 208 int ret; 209 210 if ((rates->minimum_linkrate && 211 rates->minimum_linkrate > phy->maximum_linkrate) || 212 (rates->maximum_linkrate && 213 rates->maximum_linkrate < phy->minimum_linkrate)) 214 return -EINVAL; 215 216 if (rates->minimum_linkrate && 217 rates->minimum_linkrate < phy->minimum_linkrate_hw) 218 rates->minimum_linkrate = phy->minimum_linkrate_hw; 219 220 if (rates->maximum_linkrate && 221 rates->maximum_linkrate > phy->maximum_linkrate_hw) 222 rates->maximum_linkrate = phy->maximum_linkrate_hw; 223 224 if (scsi_is_sas_phy_local(phy)) { 225 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 226 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 227 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 228 struct sas_internal *i = 229 to_sas_internal(sas_ha->core.shost->transportt); 230 231 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, 232 rates); 233 } else { 234 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 235 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 236 ret = sas_smp_phy_control(ddev, phy->number, 237 PHY_FUNC_LINK_RESET, rates); 238 239 } 240 241 return ret; 242 } 243 244 static struct sas_function_template sft = { 245 .phy_enable = sas_phy_enable, 246 .phy_reset = sas_phy_reset, 247 .set_phy_speed = sas_set_phy_speed, 248 .get_linkerrors = sas_get_linkerrors, 249 }; 250 251 struct scsi_transport_template * 252 sas_domain_attach_transport(struct sas_domain_function_template *dft) 253 { 254 struct scsi_transport_template *stt = sas_attach_transport(&sft); 255 struct sas_internal *i; 256 257 if (!stt) 258 return stt; 259 260 i = to_sas_internal(stt); 261 i->dft = dft; 262 stt->create_work_queue = 1; 263 stt->eh_timed_out = sas_scsi_timed_out; 264 stt->eh_strategy_handler = sas_scsi_recover_host; 265 266 return stt; 267 } 268 EXPORT_SYMBOL_GPL(sas_domain_attach_transport); 269 270 271 void sas_domain_release_transport(struct scsi_transport_template *stt) 272 { 273 sas_release_transport(stt); 274 } 275 EXPORT_SYMBOL_GPL(sas_domain_release_transport); 276 277 /* ---------- SAS Class register/unregister ---------- */ 278 279 static int __init sas_class_init(void) 280 { 281 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), 282 0, SLAB_HWCACHE_ALIGN, NULL, NULL); 283 if (!sas_task_cache) 284 return -ENOMEM; 285 286 return 0; 287 } 288 289 static void __exit sas_class_exit(void) 290 { 291 kmem_cache_destroy(sas_task_cache); 292 } 293 294 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); 295 MODULE_DESCRIPTION("SAS Transport Layer"); 296 MODULE_LICENSE("GPL v2"); 297 298 module_init(sas_class_init); 299 module_exit(sas_class_exit); 300 301 EXPORT_SYMBOL_GPL(sas_register_ha); 302 EXPORT_SYMBOL_GPL(sas_unregister_ha); 303