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 37void 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 */ 69static 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 161int 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 181void 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 */ 200int 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 214out_err: 215 sas_notify_lldd_dev_gone(dev); 216out_err2: 217 return res; 218} 219 220/* ---------- Device registration and unregistration ---------- */ 221 222static inline void sas_unregister_common_dev(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 list_del_init(&dev->dev_list_node); 230} 231 232void sas_unregister_dev(struct domain_device *dev) 233{ 234 if (dev->rphy) { 235 sas_remove_children(&dev->rphy->dev); 236 sas_rphy_delete(dev->rphy); 237 dev->rphy = NULL; 238 } 239 if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) { 240 /* remove the phys and ports, everything else should be gone */ 241 kfree(dev->ex_dev.ex_phy); 242 dev->ex_dev.ex_phy = NULL; 243 } 244 sas_unregister_common_dev(dev); 245} 246 247void sas_unregister_domain_devices(struct asd_sas_port *port) 248{ 249 struct domain_device *dev, *n; 250 251 list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node) 252 sas_unregister_dev(dev); 253 254 port->port->rphy = NULL; 255 256} 257 258/* ---------- Discovery and Revalidation ---------- */ 259 260/** 261 * sas_discover_domain -- discover the domain 262 * @port: port to the domain of interest 263 * 264 * NOTE: this process _must_ quit (return) as soon as any connection 265 * errors are encountered. Connection recovery is done elsewhere. 266 * Discover process only interrogates devices in order to discover the 267 * domain. 268 */ 269static void sas_discover_domain(struct work_struct *work) 270{ 271 struct domain_device *dev; 272 int error = 0; 273 struct sas_discovery_event *ev = 274 container_of(work, struct sas_discovery_event, work); 275 struct asd_sas_port *port = ev->port; 276 277 sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock, 278 &port->disc.pending); 279 280 if (port->port_dev) 281 return; 282 283 error = sas_get_port_device(port); 284 if (error) 285 return; 286 dev = port->port_dev; 287 288 SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id, 289 task_pid_nr(current)); 290 291 switch (dev->dev_type) { 292 case SAS_END_DEV: 293 error = sas_discover_end_dev(dev); 294 break; 295 case EDGE_DEV: 296 case FANOUT_DEV: 297 error = sas_discover_root_expander(dev); 298 break; 299 case SATA_DEV: 300 case SATA_PM: 301#ifdef CONFIG_SCSI_SAS_ATA 302 error = sas_discover_sata(dev); 303 break; 304#else 305 SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n"); 306 /* Fall through */ 307#endif 308 default: 309 error = -ENXIO; 310 SAS_DPRINTK("unhandled device %d\n", dev->dev_type); 311 break; 312 } 313 314 if (error) { 315 sas_rphy_free(dev->rphy); 316 dev->rphy = NULL; 317 318 spin_lock_irq(&port->dev_list_lock); 319 list_del_init(&dev->dev_list_node); 320 spin_unlock_irq(&port->dev_list_lock); 321 322 kfree(dev); /* not kobject_register-ed yet */ 323 port->port_dev = NULL; 324 } 325 326 SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, 327 task_pid_nr(current), error); 328} 329 330static void sas_revalidate_domain(struct work_struct *work) 331{ 332 int res = 0; 333 struct sas_discovery_event *ev = 334 container_of(work, struct sas_discovery_event, work); 335 struct asd_sas_port *port = ev->port; 336 337 sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock, 338 &port->disc.pending); 339 340 SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, 341 task_pid_nr(current)); 342 if (port->port_dev) 343 res = sas_ex_revalidate_domain(port->port_dev); 344 345 SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", 346 port->id, task_pid_nr(current), res); 347} 348 349/* ---------- Events ---------- */ 350 351int sas_discover_event(struct asd_sas_port *port, enum discover_event ev) 352{ 353 struct sas_discovery *disc; 354 355 if (!port) 356 return 0; 357 disc = &port->disc; 358 359 BUG_ON(ev >= DISC_NUM_EVENTS); 360 361 sas_queue_event(ev, &disc->disc_event_lock, &disc->pending, 362 &disc->disc_work[ev].work, port->ha); 363 364 return 0; 365} 366 367/** 368 * sas_init_disc -- initialize the discovery struct in the port 369 * @port: pointer to struct port 370 * 371 * Called when the ports are being initialized. 372 */ 373void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port) 374{ 375 int i; 376 377 static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = { 378 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain, 379 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain, 380 }; 381 382 spin_lock_init(&disc->disc_event_lock); 383 disc->pending = 0; 384 for (i = 0; i < DISC_NUM_EVENTS; i++) { 385 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]); 386 disc->disc_work[i].port = port; 387 } 388} 389