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 INIT_LIST_HEAD(&sas_ha->eh_done_q); 116 117 return 0; 118 119 Undo_ports: 120 sas_unregister_ports(sas_ha); 121 Undo_phys: 122 123 return error; 124 } 125 126 int sas_unregister_ha(struct sas_ha_struct *sas_ha) 127 { 128 if (sas_ha->lldd_max_execute_num > 1) { 129 sas_shutdown_queue(sas_ha); 130 } 131 132 sas_unregister_ports(sas_ha); 133 134 return 0; 135 } 136 137 static int sas_get_linkerrors(struct sas_phy *phy) 138 { 139 if (scsi_is_sas_phy_local(phy)) 140 /* FIXME: we have no local phy stats 141 * gathering at this time */ 142 return -EINVAL; 143 144 return sas_smp_get_phy_events(phy); 145 } 146 147 int sas_phy_reset(struct sas_phy *phy, int hard_reset) 148 { 149 int ret; 150 enum phy_func reset_type; 151 152 if (hard_reset) 153 reset_type = PHY_FUNC_HARD_RESET; 154 else 155 reset_type = PHY_FUNC_LINK_RESET; 156 157 if (scsi_is_sas_phy_local(phy)) { 158 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 159 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 160 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 161 struct sas_internal *i = 162 to_sas_internal(sas_ha->core.shost->transportt); 163 164 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 165 } else { 166 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 167 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 168 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 169 } 170 return ret; 171 } 172 173 static int sas_set_phy_speed(struct sas_phy *phy, 174 struct sas_phy_linkrates *rates) 175 { 176 int ret; 177 178 if ((rates->minimum_linkrate && 179 rates->minimum_linkrate > phy->maximum_linkrate) || 180 (rates->maximum_linkrate && 181 rates->maximum_linkrate < phy->minimum_linkrate)) 182 return -EINVAL; 183 184 if (rates->minimum_linkrate && 185 rates->minimum_linkrate < phy->minimum_linkrate_hw) 186 rates->minimum_linkrate = phy->minimum_linkrate_hw; 187 188 if (rates->maximum_linkrate && 189 rates->maximum_linkrate > phy->maximum_linkrate_hw) 190 rates->maximum_linkrate = phy->maximum_linkrate_hw; 191 192 if (scsi_is_sas_phy_local(phy)) { 193 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 194 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 195 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 196 struct sas_internal *i = 197 to_sas_internal(sas_ha->core.shost->transportt); 198 199 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, 200 rates); 201 } else { 202 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 203 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 204 ret = sas_smp_phy_control(ddev, phy->number, 205 PHY_FUNC_LINK_RESET, rates); 206 207 } 208 209 return ret; 210 } 211 212 static struct sas_function_template sft = { 213 .phy_reset = sas_phy_reset, 214 .set_phy_speed = sas_set_phy_speed, 215 .get_linkerrors = sas_get_linkerrors, 216 }; 217 218 struct scsi_transport_template * 219 sas_domain_attach_transport(struct sas_domain_function_template *dft) 220 { 221 struct scsi_transport_template *stt = sas_attach_transport(&sft); 222 struct sas_internal *i; 223 224 if (!stt) 225 return stt; 226 227 i = to_sas_internal(stt); 228 i->dft = dft; 229 stt->create_work_queue = 1; 230 stt->eh_timed_out = sas_scsi_timed_out; 231 stt->eh_strategy_handler = sas_scsi_recover_host; 232 233 return stt; 234 } 235 EXPORT_SYMBOL_GPL(sas_domain_attach_transport); 236 237 238 void sas_domain_release_transport(struct scsi_transport_template *stt) 239 { 240 sas_release_transport(stt); 241 } 242 EXPORT_SYMBOL_GPL(sas_domain_release_transport); 243 244 /* ---------- SAS Class register/unregister ---------- */ 245 246 static int __init sas_class_init(void) 247 { 248 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task), 249 0, SLAB_HWCACHE_ALIGN, NULL, NULL); 250 if (!sas_task_cache) 251 return -ENOMEM; 252 253 return 0; 254 } 255 256 static void __exit sas_class_exit(void) 257 { 258 kmem_cache_destroy(sas_task_cache); 259 } 260 261 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); 262 MODULE_DESCRIPTION("SAS Transport Layer"); 263 MODULE_LICENSE("GPL v2"); 264 265 module_init(sas_class_init); 266 module_exit(sas_class_exit); 267 268 EXPORT_SYMBOL_GPL(sas_register_ha); 269 EXPORT_SYMBOL_GPL(sas_unregister_ha); 270