drivers/scsi/libsas/sas_discover.c

   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 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
 232 void 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
 247 void 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  */
 269 static 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
 330 static 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
 351 int 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  */
 373 void 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 }