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_reset(struct sas_phy *phy, int hard_reset) 150 { 151 int ret; 152 enum phy_func reset_type; 153 154 if (hard_reset) 155 reset_type = PHY_FUNC_HARD_RESET; 156 else 157 reset_type = PHY_FUNC_LINK_RESET; 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 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 167 } else { 168 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 169 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 170 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 171 } 172 return ret; 173 } 174 175 static int sas_set_phy_speed(struct sas_phy *phy, 176 struct sas_phy_linkrates *rates) 177 { 178 int ret; 179 180 if ((rates->minimum_linkrate && 181 rates->minimum_linkrate > phy->maximum_linkrate) || 182 (rates->maximum_linkrate && 183 rates->maximum_linkrate < phy->minimum_linkrate)) 184 return -EINVAL; 185 186 if (rates->minimum_linkrate && 187 rates->minimum_linkrate < phy->minimum_linkrate_hw) 188 rates->minimum_linkrate = phy->minimum_linkrate_hw; 189 190 if (rates->maximum_linkrate && 191 rates->maximum_linkrate > phy->maximum_linkrate_hw) 192 rates->maximum_linkrate = phy->maximum_linkrate_hw; 193 194 if (scsi_is_sas_phy_local(phy)) { 195 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 196 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 197 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 198 struct sas_internal *i = 199 to_sas_internal(sas_ha->core.shost->transportt); 200 201 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, 202 rates); 203 } else { 204 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 205 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 206 ret = sas_smp_phy_control(ddev, phy->number, 207 PHY_FUNC_LINK_RESET, rates); 208 209 } 210 211 return ret; 212 } 213 214 static struct sas_function_template sft = { 215 .phy_reset = sas_phy_reset, 216 .set_phy_speed = sas_set_phy_speed, 217 .get_linkerrors = sas_get_linkerrors, 218 }; 219 220 struct scsi_transport_template * 221 sas_domain_attach_transport(struct sas_domain_function_template *dft) 222 { 223 struct scsi_transport_template *stt = sas_attach_transport(&sft); 224 struct sas_internal *i; 225 226 if (!stt) 227 return stt; 228 229 i = to_sas_internal(stt); 230 i->dft = dft; 231 stt->create_work_queue = 1; 232 stt->eh_timed_out = sas_scsi_timed_out; 233 stt->eh_strategy_handler = sas_scsi_recover_host; 234 235 return stt; 236 } 237 EXPORT_SYMBOL_GPL(sas_domain_attach_transport); 238 239 240 void sas_domain_release_transport(struct scsi_transport_template *stt) 241 { 242 sas_release_transport(stt); 243 } 244 EXPORT_SYMBOL_GPL(sas_domain_release_transport); 245 246 /* ---------- SAS Class register/unregister ---------- */ 247 248 static int __init sas_class_init(void) 249 { 250 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), 251 0, SLAB_HWCACHE_ALIGN, NULL, NULL); 252 if (!sas_task_cache) 253 return -ENOMEM; 254 255 return 0; 256 } 257 258 static void __exit sas_class_exit(void) 259 { 260 kmem_cache_destroy(sas_task_cache); 261 } 262 263 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); 264 MODULE_DESCRIPTION("SAS Transport Layer"); 265 MODULE_LICENSE("GPL v2"); 266 267 module_init(sas_class_init); 268 module_exit(sas_class_exit); 269 270 EXPORT_SYMBOL_GPL(sas_register_ha); 271 EXPORT_SYMBOL_GPL(sas_unregister_ha); 272