1 /* 2 * Serial Attached SCSI (SAS) Discover process 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 22 * 23 */ 24 25 #include <linux/scatterlist.h> 26 #include <linux/slab.h> 27 #include <scsi/scsi_host.h> 28 #include <scsi/scsi_eh.h> 29 #include "sas_internal.h" 30 31 #include <scsi/scsi_transport.h> 32 #include <scsi/scsi_transport_sas.h> 33 #include "../scsi_sas_internal.h" 34 35 /* ---------- Basic task processing for discovery purposes ---------- */ 36 37 void sas_init_dev(struct domain_device *dev) 38 { 39 INIT_LIST_HEAD(&dev->siblings); 40 INIT_LIST_HEAD(&dev->dev_list_node); 41 switch (dev->dev_type) { 42 case SAS_END_DEV: 43 break; 44 case EDGE_DEV: 45 case FANOUT_DEV: 46 INIT_LIST_HEAD(&dev->ex_dev.children); 47 break; 48 case SATA_DEV: 49 case SATA_PM: 50 case SATA_PM_PORT: 51 INIT_LIST_HEAD(&dev->sata_dev.children); 52 break; 53 default: 54 break; 55 } 56 } 57 58 /* ---------- Domain device discovery ---------- */ 59 60 /** 61 * sas_get_port_device -- Discover devices which caused port creation 62 * @port: pointer to struct sas_port of interest 63 * 64 * Devices directly attached to a HA port, have no parent. This is 65 * how we know they are (domain) "root" devices. All other devices 66 * do, and should have their "parent" pointer set appropriately as 67 * soon as a child device is discovered. 68 */ 69 static int sas_get_port_device(struct asd_sas_port *port) 70 { 71 unsigned long flags; 72 struct asd_sas_phy *phy; 73 struct sas_rphy *rphy; 74 struct domain_device *dev; 75 76 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 77 if (!dev) 78 return -ENOMEM; 79 80 spin_lock_irqsave(&port->phy_list_lock, flags); 81 if (list_empty(&port->phy_list)) { 82 spin_unlock_irqrestore(&port->phy_list_lock, flags); 83 kfree(dev); 84 return -ENODEV; 85 } 86 phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el); 87 spin_lock(&phy->frame_rcvd_lock); 88 memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd), 89 (size_t)phy->frame_rcvd_size)); 90 spin_unlock(&phy->frame_rcvd_lock); 91 spin_unlock_irqrestore(&port->phy_list_lock, flags); 92 93 if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) { 94 struct dev_to_host_fis *fis = 95 (struct dev_to_host_fis *) dev->frame_rcvd; 96 if (fis->interrupt_reason == 1 && fis->lbal == 1 && 97 fis->byte_count_low==0x69 && fis->byte_count_high == 0x96 98 && (fis->device & ~0x10) == 0) 99 dev->dev_type = SATA_PM; 100 else 101 dev->dev_type = SATA_DEV; 102 dev->tproto = SAS_PROTOCOL_SATA; 103 } else { 104 struct sas_identify_frame *id = 105 (struct sas_identify_frame *) dev->frame_rcvd; 106 dev->dev_type = id->dev_type; 107 dev->iproto = id->initiator_bits; 108 dev->tproto = id->target_bits; 109 } 110 111 sas_init_dev(dev); 112 113 switch (dev->dev_type) { 114 case SAS_END_DEV: 115 case SATA_DEV: 116 rphy = sas_end_device_alloc(port->port); 117 break; 118 case EDGE_DEV: 119 rphy = sas_expander_alloc(port->port, 120 SAS_EDGE_EXPANDER_DEVICE); 121 break; 122 case FANOUT_DEV: 123 rphy = sas_expander_alloc(port->port, 124 SAS_FANOUT_EXPANDER_DEVICE); 125 break; 126 default: 127 printk("ERROR: Unidentified device type %d\n", dev->dev_type); 128 rphy = NULL; 129 break; 130 } 131 132 if (!rphy) { 133 kfree(dev); 134 return -ENODEV; 135 } 136 rphy->identify.phy_identifier = phy->phy->identify.phy_identifier; 137 memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE); 138 sas_fill_in_rphy(dev, rphy); 139 sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); 140 port->port_dev = dev; 141 dev->port = port; 142 dev->linkrate = port->linkrate; 143 dev->min_linkrate = port->linkrate; 144 dev->max_linkrate = port->linkrate; 145 dev->pathways = port->num_phys; 146 memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE); 147 memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE); 148 memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE); 149 port->disc.max_level = 0; 150 151 dev->rphy = rphy; 152 spin_lock_irq(&port->dev_list_lock); 153 list_add_tail(&dev->dev_list_node, &port->dev_list); 154 spin_unlock_irq(&port->dev_list_lock); 155 156 return 0; 157 } 158 159 /* ---------- Discover and Revalidate ---------- */ 160 161 int sas_notify_lldd_dev_found(struct domain_device *dev) 162 { 163 int res = 0; 164 struct sas_ha_struct *sas_ha = dev->port->ha; 165 struct Scsi_Host *shost = sas_ha->core.shost; 166 struct sas_internal *i = to_sas_internal(shost->transportt); 167 168 if (i->dft->lldd_dev_found) { 169 res = i->dft->lldd_dev_found(dev); 170 if (res) { 171 printk("sas: driver on pcidev %s cannot handle " 172 "device %llx, error:%d\n", 173 dev_name(sas_ha->dev), 174 SAS_ADDR(dev->sas_addr), res); 175 } 176 } 177 return res; 178 } 179 180 181 void sas_notify_lldd_dev_gone(struct domain_device *dev) 182 { 183 struct sas_ha_struct *sas_ha = dev->port->ha; 184 struct Scsi_Host *shost = sas_ha->core.shost; 185 struct sas_internal *i = to_sas_internal(shost->transportt); 186 187 if (i->dft->lldd_dev_gone) 188 i->dft->lldd_dev_gone(dev); 189 } 190 191 /* ---------- Common/dispatchers ---------- */ 192 193 194 /** 195 * sas_discover_end_dev -- discover an end device (SSP, etc) 196 * @end: pointer to domain device of interest 197 * 198 * See comment in sas_discover_sata(). 199 */ 200 int sas_discover_end_dev(struct domain_device *dev) 201 { 202 int res; 203 204 res = sas_notify_lldd_dev_found(dev); 205 if (res) 206 goto out_err2; 207 208 res = sas_rphy_add(dev->rphy); 209 if (res) 210 goto out_err; 211 212 return 0; 213 214 out_err: 215 sas_notify_lldd_dev_gone(dev); 216 out_err2: 217 return res; 218 } 219 220 /* ---------- Device registration and unregistration ---------- */ 221 222 static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev) 223 { 224 sas_notify_lldd_dev_gone(dev); 225 if (!dev->parent) 226 dev->port->port_dev = NULL; 227 else 228 list_del_init(&dev->siblings); 229 230 spin_lock_irq(&port->dev_list_lock); 231 list_del_init(&dev->dev_list_node); 232 spin_unlock_irq(&port->dev_list_lock); 233 } 234 235 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev) 236 { 237 if (dev->rphy) { 238 sas_remove_children(&dev->rphy->dev); 239 sas_rphy_delete(dev->rphy); 240 dev->rphy = NULL; 241 } 242 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) { 243 /* remove the phys and ports, everything else should be gone */ 244 kfree(dev->ex_dev.ex_phy); 245 dev->ex_dev.ex_phy = NULL; 246 } 247 sas_unregister_common_dev(port, dev); 248 } 249 250 void sas_unregister_domain_devices(struct asd_sas_port *port) 251 { 252 struct domain_device *dev, *n; 253 254 list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) 255 sas_unregister_dev(port, dev); 256 257 port->port->rphy = NULL; 258 259 } 260 261 /* ---------- Discovery and Revalidation ---------- */ 262 263 /** 264 * sas_discover_domain -- discover the domain 265 * @port: port to the domain of interest 266 * 267 * NOTE: this process _must_ quit (return) as soon as any connection 268 * errors are encountered. Connection recovery is done elsewhere. 269 * Discover process only interrogates devices in order to discover the 270 * domain. 271 */ 272 static void sas_discover_domain(struct work_struct *work) 273 { 274 struct domain_device *dev; 275 int error = 0; 276 struct sas_discovery_event *ev = 277 container_of(work, struct sas_discovery_event, work); 278 struct asd_sas_port *port = ev->port; 279 280 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock, 281 &port->disc.pending); 282 283 if (port->port_dev) 284 return; 285 286 error = sas_get_port_device(port); 287 if (error) 288 return; 289 dev = port->port_dev; 290 291 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id, 292 task_pid_nr(current)); 293 294 switch (dev->dev_type) { 295 case SAS_END_DEV: 296 error = sas_discover_end_dev(dev); 297 break; 298 case EDGE_DEV: 299 case FANOUT_DEV: 300 error = sas_discover_root_expander(dev); 301 break; 302 case SATA_DEV: 303 case SATA_PM: 304 #ifdef CONFIG_SCSI_SAS_ATA 305 error = sas_discover_sata(dev); 306 break; 307 #else 308 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n"); 309 /* Fall through */ 310 #endif 311 default: 312 error = -ENXIO; 313 SAS_DPRINTK("unhandled device %d\n", dev->dev_type); 314 break; 315 } 316 317 if (error) { 318 sas_rphy_free(dev->rphy); 319 dev->rphy = NULL; 320 321 spin_lock_irq(&port->dev_list_lock); 322 list_del_init(&dev->dev_list_node); 323 spin_unlock_irq(&port->dev_list_lock); 324 325 kfree(dev); /* not kobject_register-ed yet */ 326 port->port_dev = NULL; 327 } 328 329 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, 330 task_pid_nr(current), error); 331 } 332 333 static void sas_revalidate_domain(struct work_struct *work) 334 { 335 int res = 0; 336 struct sas_discovery_event *ev = 337 container_of(work, struct sas_discovery_event, work); 338 struct asd_sas_port *port = ev->port; 339 340 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock, 341 &port->disc.pending); 342 343 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, 344 task_pid_nr(current)); 345 if (port->port_dev) 346 res = sas_ex_revalidate_domain(port->port_dev); 347 348 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", 349 port->id, task_pid_nr(current), res); 350 } 351 352 /* ---------- Events ---------- */ 353 354 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev) 355 { 356 struct sas_discovery *disc; 357 358 if (!port) 359 return 0; 360 disc = &port->disc; 361 362 BUG_ON(ev >= DISC_NUM_EVENTS); 363 364 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending, 365 &disc->disc_work[ev].work, port->ha); 366 367 return 0; 368 } 369 370 /** 371 * sas_init_disc -- initialize the discovery struct in the port 372 * @port: pointer to struct port 373 * 374 * Called when the ports are being initialized. 375 */ 376 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port) 377 { 378 int i; 379 380 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = { 381 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain, 382 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain, 383 }; 384 385 spin_lock_init(&disc->disc_event_lock); 386 disc->pending = 0; 387 for (i = 0; i < DISC_NUM_EVENTS; i++) { 388 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]); 389 disc->disc_work[i].port = port; 390 } 391 } 392