drivers/scsi/ses.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SCSI Enclosure Services
   4  *
   5  * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/enclosure.h>
  12 #include <asm/unaligned.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_cmnd.h>
  16 #include <scsi/scsi_dbg.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_driver.h>
  19 #include <scsi/scsi_host.h>
  20
  21 #include <scsi/scsi_transport_sas.h>
  22
  23 struct ses_device {
  24         unsigned char *page1;
  25         unsigned char *page1_types;
  26         unsigned char *page2;
  27         unsigned char *page10;
  28         short page1_len;
  29         short page1_num_types;
  30         short page2_len;
  31         short page10_len;
  32 };
  33
  34 struct ses_component {
  35         u64 addr;
  36 };
  37
  38 static bool ses_page2_supported(struct enclosure_device *edev)
  39 {
  40         struct ses_device *ses_dev = edev->scratch;
  41
  42         return (ses_dev->page2 != NULL);
  43 }
  44
  45 static int ses_probe(struct device *dev)
  46 {
  47         struct scsi_device *sdev = to_scsi_device(dev);
  48         int err = -ENODEV;
  49
  50         if (sdev->type != TYPE_ENCLOSURE)
  51                 goto out;
  52
  53         err = 0;
  54         sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
  55
  56  out:
  57         return err;
  58 }
  59
  60 #define SES_TIMEOUT (30 * HZ)
  61 #define SES_RETRIES 3
  62
  63 static void init_device_slot_control(unsigned char *dest_desc,
  64                                      struct enclosure_component *ecomp,
  65                                      unsigned char *status)
  66 {
  67         memcpy(dest_desc, status, 4);
  68         dest_desc[0] = 0;
  69         /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
  70         if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
  71                 dest_desc[1] = 0;
  72         dest_desc[2] &= 0xde;
  73         dest_desc[3] &= 0x3c;
  74 }
  75
  76
  77 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
  78                          void *buf, int bufflen)
  79 {
  80         int ret;
  81         unsigned char cmd[] = {
  82                 RECEIVE_DIAGNOSTIC,
  83                 1,              /* Set PCV bit */
  84                 page_code,
  85                 bufflen >> 8,
  86                 bufflen & 0xff,
  87                 0
  88         };
  89         unsigned char recv_page_code;
  90
  91         ret =  scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
  92                                 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
  93         if (unlikely(ret))
  94                 return ret;
  95
  96         recv_page_code = ((unsigned char *)buf)[0];
  97
  98         if (likely(recv_page_code == page_code))
  99                 return ret;
 100
 101         /* successful diagnostic but wrong page code.  This happens to some
 102          * USB devices, just print a message and pretend there was an error */
 103
 104         sdev_printk(KERN_ERR, sdev,
 105                     "Wrong diagnostic page; asked for %d got %u\n",
 106                     page_code, recv_page_code);
 107
 108         return -EINVAL;
 109 }
 110
 111 static int ses_send_diag(struct scsi_device *sdev, int page_code,
 112                          void *buf, int bufflen)
 113 {
 114         u32 result;
 115
 116         unsigned char cmd[] = {
 117                 SEND_DIAGNOSTIC,
 118                 0x10,           /* Set PF bit */
 119                 0,
 120                 bufflen >> 8,
 121                 bufflen & 0xff,
 122                 0
 123         };
 124
 125         result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
 126                                   NULL, SES_TIMEOUT, SES_RETRIES, NULL);
 127         if (result)
 128                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
 129                             result);
 130         return result;
 131 }
 132
 133 static int ses_set_page2_descriptor(struct enclosure_device *edev,
 134                                       struct enclosure_component *ecomp,
 135                                       unsigned char *desc)
 136 {
 137         int i, j, count = 0, descriptor = ecomp->number;
 138         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 139         struct ses_device *ses_dev = edev->scratch;
 140         unsigned char *type_ptr = ses_dev->page1_types;
 141         unsigned char *desc_ptr = ses_dev->page2 + 8;
 142
 143         /* Clear everything */
 144         memset(desc_ptr, 0, ses_dev->page2_len - 8);
 145         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 146                 for (j = 0; j < type_ptr[1]; j++) {
 147                         desc_ptr += 4;
 148                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 149                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 150                                 continue;
 151                         if (count++ == descriptor) {
 152                                 memcpy(desc_ptr, desc, 4);
 153                                 /* set select */
 154                                 desc_ptr[0] |= 0x80;
 155                                 /* clear reserved, just in case */
 156                                 desc_ptr[0] &= 0xf0;
 157                         }
 158                 }
 159         }
 160
 161         return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 162 }
 163
 164 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 165                                       struct enclosure_component *ecomp)
 166 {
 167         int i, j, count = 0, descriptor = ecomp->number;
 168         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 169         struct ses_device *ses_dev = edev->scratch;
 170         unsigned char *type_ptr = ses_dev->page1_types;
 171         unsigned char *desc_ptr = ses_dev->page2 + 8;
 172
 173         if (ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len) < 0)
 174                 return NULL;
 175
 176         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 177                 for (j = 0; j < type_ptr[1]; j++) {
 178                         desc_ptr += 4;
 179                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 180                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 181                                 continue;
 182                         if (count++ == descriptor)
 183                                 return desc_ptr;
 184                 }
 185         }
 186         return NULL;
 187 }
 188
 189 /* For device slot and array device slot elements, byte 3 bit 6
 190  * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
 191  * code stands these bits are shifted 4 positions right so in
 192  * sysfs they will appear as bits 2 and 1 respectively. Strange. */
 193 static void ses_get_fault(struct enclosure_device *edev,
 194                           struct enclosure_component *ecomp)
 195 {
 196         unsigned char *desc;
 197
 198         if (!ses_page2_supported(edev)) {
 199                 ecomp->fault = 0;
 200                 return;
 201         }
 202         desc = ses_get_page2_descriptor(edev, ecomp);
 203         if (desc)
 204                 ecomp->fault = (desc[3] & 0x60) >> 4;
 205 }
 206
 207 static int ses_set_fault(struct enclosure_device *edev,
 208                           struct enclosure_component *ecomp,
 209                          enum enclosure_component_setting val)
 210 {
 211         unsigned char desc[4];
 212         unsigned char *desc_ptr;
 213
 214         if (!ses_page2_supported(edev))
 215                 return -EINVAL;
 216
 217         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 218
 219         if (!desc_ptr)
 220                 return -EIO;
 221
 222         init_device_slot_control(desc, ecomp, desc_ptr);
 223
 224         switch (val) {
 225         case ENCLOSURE_SETTING_DISABLED:
 226                 desc[3] &= 0xdf;
 227                 break;
 228         case ENCLOSURE_SETTING_ENABLED:
 229                 desc[3] |= 0x20;
 230                 break;
 231         default:
 232                 /* SES doesn't do the SGPIO blink settings */
 233                 return -EINVAL;
 234         }
 235
 236         return ses_set_page2_descriptor(edev, ecomp, desc);
 237 }
 238
 239 static void ses_get_status(struct enclosure_device *edev,
 240                            struct enclosure_component *ecomp)
 241 {
 242         unsigned char *desc;
 243
 244         if (!ses_page2_supported(edev)) {
 245                 ecomp->status = 0;
 246                 return;
 247         }
 248         desc = ses_get_page2_descriptor(edev, ecomp);
 249         if (desc)
 250                 ecomp->status = (desc[0] & 0x0f);
 251 }
 252
 253 static void ses_get_locate(struct enclosure_device *edev,
 254                            struct enclosure_component *ecomp)
 255 {
 256         unsigned char *desc;
 257
 258         if (!ses_page2_supported(edev)) {
 259                 ecomp->locate = 0;
 260                 return;
 261         }
 262         desc = ses_get_page2_descriptor(edev, ecomp);
 263         if (desc)
 264                 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
 265 }
 266
 267 static int ses_set_locate(struct enclosure_device *edev,
 268                           struct enclosure_component *ecomp,
 269                           enum enclosure_component_setting val)
 270 {
 271         unsigned char desc[4];
 272         unsigned char *desc_ptr;
 273
 274         if (!ses_page2_supported(edev))
 275                 return -EINVAL;
 276
 277         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 278
 279         if (!desc_ptr)
 280                 return -EIO;
 281
 282         init_device_slot_control(desc, ecomp, desc_ptr);
 283
 284         switch (val) {
 285         case ENCLOSURE_SETTING_DISABLED:
 286                 desc[2] &= 0xfd;
 287                 break;
 288         case ENCLOSURE_SETTING_ENABLED:
 289                 desc[2] |= 0x02;
 290                 break;
 291         default:
 292                 /* SES doesn't do the SGPIO blink settings */
 293                 return -EINVAL;
 294         }
 295         return ses_set_page2_descriptor(edev, ecomp, desc);
 296 }
 297
 298 static int ses_set_active(struct enclosure_device *edev,
 299                           struct enclosure_component *ecomp,
 300                           enum enclosure_component_setting val)
 301 {
 302         unsigned char desc[4];
 303         unsigned char *desc_ptr;
 304
 305         if (!ses_page2_supported(edev))
 306                 return -EINVAL;
 307
 308         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 309
 310         if (!desc_ptr)
 311                 return -EIO;
 312
 313         init_device_slot_control(desc, ecomp, desc_ptr);
 314
 315         switch (val) {
 316         case ENCLOSURE_SETTING_DISABLED:
 317                 desc[2] &= 0x7f;
 318                 ecomp->active = 0;
 319                 break;
 320         case ENCLOSURE_SETTING_ENABLED:
 321                 desc[2] |= 0x80;
 322                 ecomp->active = 1;
 323                 break;
 324         default:
 325                 /* SES doesn't do the SGPIO blink settings */
 326                 return -EINVAL;
 327         }
 328         return ses_set_page2_descriptor(edev, ecomp, desc);
 329 }
 330
 331 static int ses_show_id(struct enclosure_device *edev, char *buf)
 332 {
 333         struct ses_device *ses_dev = edev->scratch;
 334         unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
 335
 336         return sprintf(buf, "%#llx\n", id);
 337 }
 338
 339 static void ses_get_power_status(struct enclosure_device *edev,
 340                                  struct enclosure_component *ecomp)
 341 {
 342         unsigned char *desc;
 343
 344         if (!ses_page2_supported(edev)) {
 345                 ecomp->power_status = 0;
 346                 return;
 347         }
 348
 349         desc = ses_get_page2_descriptor(edev, ecomp);
 350         if (desc)
 351                 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
 352 }
 353
 354 static int ses_set_power_status(struct enclosure_device *edev,
 355                                 struct enclosure_component *ecomp,
 356                                 int val)
 357 {
 358         unsigned char desc[4];
 359         unsigned char *desc_ptr;
 360
 361         if (!ses_page2_supported(edev))
 362                 return -EINVAL;
 363
 364         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 365
 366         if (!desc_ptr)
 367                 return -EIO;
 368
 369         init_device_slot_control(desc, ecomp, desc_ptr);
 370
 371         switch (val) {
 372         /* power = 1 is device_off = 0 and vice versa */
 373         case 0:
 374                 desc[3] |= 0x10;
 375                 break;
 376         case 1:
 377                 desc[3] &= 0xef;
 378                 break;
 379         default:
 380                 return -EINVAL;
 381         }
 382         ecomp->power_status = val;
 383         return ses_set_page2_descriptor(edev, ecomp, desc);
 384 }
 385
 386 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
 387         .get_fault              = ses_get_fault,
 388         .set_fault              = ses_set_fault,
 389         .get_status             = ses_get_status,
 390         .get_locate             = ses_get_locate,
 391         .set_locate             = ses_set_locate,
 392         .get_power_status       = ses_get_power_status,
 393         .set_power_status       = ses_set_power_status,
 394         .set_active             = ses_set_active,
 395         .show_id                = ses_show_id,
 396 };
 397
 398 struct ses_host_edev {
 399         struct Scsi_Host *shost;
 400         struct enclosure_device *edev;
 401 };
 402
 403 #if 0
 404 int ses_match_host(struct enclosure_device *edev, void *data)
 405 {
 406         struct ses_host_edev *sed = data;
 407         struct scsi_device *sdev;
 408
 409         if (!scsi_is_sdev_device(edev->edev.parent))
 410                 return 0;
 411
 412         sdev = to_scsi_device(edev->edev.parent);
 413
 414         if (sdev->host != sed->shost)
 415                 return 0;
 416
 417         sed->edev = edev;
 418         return 1;
 419 }
 420 #endif  /*  0  */
 421
 422 static void ses_process_descriptor(struct enclosure_component *ecomp,
 423                                    unsigned char *desc)
 424 {
 425         int eip = desc[0] & 0x10;
 426         int invalid = desc[0] & 0x80;
 427         enum scsi_protocol proto = desc[0] & 0x0f;
 428         u64 addr = 0;
 429         int slot = -1;
 430         struct ses_component *scomp = ecomp->scratch;
 431         unsigned char *d;
 432
 433         if (invalid)
 434                 return;
 435
 436         switch (proto) {
 437         case SCSI_PROTOCOL_FCP:
 438                 if (eip) {
 439                         d = desc + 4;
 440                         slot = d[3];
 441                 }
 442                 break;
 443         case SCSI_PROTOCOL_SAS:
 444                 if (eip) {
 445                         d = desc + 4;
 446                         slot = d[3];
 447                         d = desc + 8;
 448                 } else
 449                         d = desc + 4;
 450                 /* only take the phy0 addr */
 451                 addr = (u64)d[12] << 56 |
 452                         (u64)d[13] << 48 |
 453                         (u64)d[14] << 40 |
 454                         (u64)d[15] << 32 |
 455                         (u64)d[16] << 24 |
 456                         (u64)d[17] << 16 |
 457                         (u64)d[18] << 8 |
 458                         (u64)d[19];
 459                 break;
 460         default:
 461                 /* FIXME: Need to add more protocols than just SAS */
 462                 break;
 463         }
 464         ecomp->slot = slot;
 465         scomp->addr = addr;
 466 }
 467
 468 struct efd {
 469         u64 addr;
 470         struct device *dev;
 471 };
 472
 473 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
 474                                       void *data)
 475 {
 476         struct efd *efd = data;
 477         int i;
 478         struct ses_component *scomp;
 479
 480         if (!edev->component[0].scratch)
 481                 return 0;
 482
 483         for (i = 0; i < edev->components; i++) {
 484                 scomp = edev->component[i].scratch;
 485                 if (scomp->addr != efd->addr)
 486                         continue;
 487
 488                 if (enclosure_add_device(edev, i, efd->dev) == 0)
 489                         kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
 490                 return 1;
 491         }
 492         return 0;
 493 }
 494
 495 #define INIT_ALLOC_SIZE 32
 496
 497 static void ses_enclosure_data_process(struct enclosure_device *edev,
 498                                        struct scsi_device *sdev,
 499                                        int create)
 500 {
 501         u32 result;
 502         unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
 503         int i, j, page7_len, len, components;
 504         struct ses_device *ses_dev = edev->scratch;
 505         int types = ses_dev->page1_num_types;
 506         unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 507
 508         if (!hdr_buf)
 509                 goto simple_populate;
 510
 511         /* re-read page 10 */
 512         if (ses_dev->page10)
 513                 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
 514         /* Page 7 for the descriptors is optional */
 515         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
 516         if (result)
 517                 goto simple_populate;
 518
 519         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 520         /* add 1 for trailing '\0' we'll use */
 521         buf = kzalloc(len + 1, GFP_KERNEL);
 522         if (!buf)
 523                 goto simple_populate;
 524         result = ses_recv_diag(sdev, 7, buf, len);
 525         if (result) {
 526  simple_populate:
 527                 kfree(buf);
 528                 buf = NULL;
 529                 desc_ptr = NULL;
 530                 len = 0;
 531                 page7_len = 0;
 532         } else {
 533                 desc_ptr = buf + 8;
 534                 len = (desc_ptr[2] << 8) + desc_ptr[3];
 535                 /* skip past overall descriptor */
 536                 desc_ptr += len + 4;
 537         }
 538         if (ses_dev->page10)
 539                 addl_desc_ptr = ses_dev->page10 + 8;
 540         type_ptr = ses_dev->page1_types;
 541         components = 0;
 542         for (i = 0; i < types; i++, type_ptr += 4) {
 543                 for (j = 0; j < type_ptr[1]; j++) {
 544                         char *name = NULL;
 545                         struct enclosure_component *ecomp;
 546
 547                         if (desc_ptr) {
 548                                 if (desc_ptr >= buf + page7_len) {
 549                                         desc_ptr = NULL;
 550                                 } else {
 551                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
 552                                         desc_ptr += 4;
 553                                         /* Add trailing zero - pushes into
 554                                          * reserved space */
 555                                         desc_ptr[len] = '\0';
 556                                         name = desc_ptr;
 557                                 }
 558                         }
 559                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 560                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
 561
 562                                 if (create)
 563                                         ecomp = enclosure_component_alloc(
 564                                                 edev,
 565                                                 components++,
 566                                                 type_ptr[0],
 567                                                 name);
 568                                 else
 569                                         ecomp = &edev->component[components++];
 570
 571                                 if (!IS_ERR(ecomp)) {
 572                                         if (addl_desc_ptr)
 573                                                 ses_process_descriptor(
 574                                                         ecomp,
 575                                                         addl_desc_ptr);
 576                                         if (create)
 577                                                 enclosure_component_register(
 578                                                         ecomp);
 579                                 }
 580                         }
 581                         if (desc_ptr)
 582                                 desc_ptr += len;
 583
 584                         if (addl_desc_ptr &&
 585                             /* only find additional descriptions for specific devices */
 586                             (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 587                              type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
 588                              type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
 589                              /* these elements are optional */
 590                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
 591                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
 592                              type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
 593                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
 594
 595                 }
 596         }
 597         kfree(buf);
 598         kfree(hdr_buf);
 599 }
 600
 601 static void ses_match_to_enclosure(struct enclosure_device *edev,
 602                                    struct scsi_device *sdev,
 603                                    int refresh)
 604 {
 605         struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
 606         struct efd efd = {
 607                 .addr = 0,
 608         };
 609
 610         if (refresh)
 611                 ses_enclosure_data_process(edev, edev_sdev, 0);
 612
 613         if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
 614                 efd.addr = sas_get_address(sdev);
 615
 616         if (efd.addr) {
 617                 efd.dev = &sdev->sdev_gendev;
 618
 619                 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
 620         }
 621 }
 622
 623 static int ses_intf_add(struct device *cdev,
 624                         struct class_interface *intf)
 625 {
 626         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 627         struct scsi_device *tmp_sdev;
 628         unsigned char *buf = NULL, *hdr_buf, *type_ptr, page;
 629         struct ses_device *ses_dev;
 630         u32 result;
 631         int i, types, len, components = 0;
 632         int err = -ENOMEM;
 633         int num_enclosures;
 634         struct enclosure_device *edev;
 635         struct ses_component *scomp = NULL;
 636
 637         if (!scsi_device_enclosure(sdev)) {
 638                 /* not an enclosure, but might be in one */
 639                 struct enclosure_device *prev = NULL;
 640
 641                 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 642                         ses_match_to_enclosure(edev, sdev, 1);
 643                         prev = edev;
 644                 }
 645                 return -ENODEV;
 646         }
 647
 648         /* TYPE_ENCLOSURE prints a message in probe */
 649         if (sdev->type != TYPE_ENCLOSURE)
 650                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
 651
 652         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
 653         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 654         if (!hdr_buf || !ses_dev)
 655                 goto err_init_free;
 656
 657         page = 1;
 658         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 659         if (result)
 660                 goto recv_failed;
 661
 662         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 663         buf = kzalloc(len, GFP_KERNEL);
 664         if (!buf)
 665                 goto err_free;
 666
 667         result = ses_recv_diag(sdev, page, buf, len);
 668         if (result)
 669                 goto recv_failed;
 670
 671         types = 0;
 672
 673         /* we always have one main enclosure and the rest are referred
 674          * to as secondary subenclosures */
 675         num_enclosures = buf[1] + 1;
 676
 677         /* begin at the enclosure descriptor */
 678         type_ptr = buf + 8;
 679         /* skip all the enclosure descriptors */
 680         for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
 681                 types += type_ptr[2];
 682                 type_ptr += type_ptr[3] + 4;
 683         }
 684
 685         ses_dev->page1_types = type_ptr;
 686         ses_dev->page1_num_types = types;
 687
 688         for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
 689                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 690                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 691                         components += type_ptr[1];
 692         }
 693         ses_dev->page1 = buf;
 694         ses_dev->page1_len = len;
 695         buf = NULL;
 696
 697         page = 2;
 698         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 699         if (result)
 700                 goto page2_not_supported;
 701
 702         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 703         buf = kzalloc(len, GFP_KERNEL);
 704         if (!buf)
 705                 goto err_free;
 706
 707         /* make sure getting page 2 actually works */
 708         result = ses_recv_diag(sdev, 2, buf, len);
 709         if (result)
 710                 goto recv_failed;
 711         ses_dev->page2 = buf;
 712         ses_dev->page2_len = len;
 713         buf = NULL;
 714
 715         /* The additional information page --- allows us
 716          * to match up the devices */
 717         page = 10;
 718         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 719         if (!result) {
 720
 721                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 722                 buf = kzalloc(len, GFP_KERNEL);
 723                 if (!buf)
 724                         goto err_free;
 725
 726                 result = ses_recv_diag(sdev, page, buf, len);
 727                 if (result)
 728                         goto recv_failed;
 729                 ses_dev->page10 = buf;
 730                 ses_dev->page10_len = len;
 731                 buf = NULL;
 732         }
 733 page2_not_supported:
 734         scomp = kcalloc(components, sizeof(struct ses_component), GFP_KERNEL);
 735         if (!scomp)
 736                 goto err_free;
 737
 738         edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
 739                                   components, &ses_enclosure_callbacks);
 740         if (IS_ERR(edev)) {
 741                 err = PTR_ERR(edev);
 742                 goto err_free;
 743         }
 744
 745         kfree(hdr_buf);
 746
 747         edev->scratch = ses_dev;
 748         for (i = 0; i < components; i++)
 749                 edev->component[i].scratch = scomp + i;
 750
 751         ses_enclosure_data_process(edev, sdev, 1);
 752
 753         /* see if there are any devices matching before
 754          * we found the enclosure */
 755         shost_for_each_device(tmp_sdev, sdev->host) {
 756                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
 757                         continue;
 758                 ses_match_to_enclosure(edev, tmp_sdev, 0);
 759         }
 760
 761         return 0;
 762
 763  recv_failed:
 764         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
 765                     page);
 766         err = -ENODEV;
 767  err_free:
 768         kfree(buf);
 769         kfree(scomp);
 770         kfree(ses_dev->page10);
 771         kfree(ses_dev->page2);
 772         kfree(ses_dev->page1);
 773  err_init_free:
 774         kfree(ses_dev);
 775         kfree(hdr_buf);
 776         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
 777         return err;
 778 }
 779
 780 static int ses_remove(struct device *dev)
 781 {
 782         return 0;
 783 }
 784
 785 static void ses_intf_remove_component(struct scsi_device *sdev)
 786 {
 787         struct enclosure_device *edev, *prev = NULL;
 788
 789         while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 790                 prev = edev;
 791                 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
 792                         break;
 793         }
 794         if (edev)
 795                 put_device(&edev->edev);
 796 }
 797
 798 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
 799 {
 800         struct enclosure_device *edev;
 801         struct ses_device *ses_dev;
 802
 803         /*  exact match to this enclosure */
 804         edev = enclosure_find(&sdev->sdev_gendev, NULL);
 805         if (!edev)
 806                 return;
 807
 808         ses_dev = edev->scratch;
 809         edev->scratch = NULL;
 810
 811         kfree(ses_dev->page10);
 812         kfree(ses_dev->page1);
 813         kfree(ses_dev->page2);
 814         kfree(ses_dev);
 815
 816         kfree(edev->component[0].scratch);
 817
 818         put_device(&edev->edev);
 819         enclosure_unregister(edev);
 820 }
 821
 822 static void ses_intf_remove(struct device *cdev,
 823                             struct class_interface *intf)
 824 {
 825         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 826
 827         if (!scsi_device_enclosure(sdev))
 828                 ses_intf_remove_component(sdev);
 829         else
 830                 ses_intf_remove_enclosure(sdev);
 831 }
 832
 833 static struct class_interface ses_interface = {
 834         .add_dev        = ses_intf_add,
 835         .remove_dev     = ses_intf_remove,
 836 };
 837
 838 static struct scsi_driver ses_template = {
 839         .gendrv = {
 840                 .name           = "ses",
 841                 .owner          = THIS_MODULE,
 842                 .probe          = ses_probe,
 843                 .remove         = ses_remove,
 844         },
 845 };
 846
 847 static int __init ses_init(void)
 848 {
 849         int err;
 850
 851         err = scsi_register_interface(&ses_interface);
 852         if (err)
 853                 return err;
 854
 855         err = scsi_register_driver(&ses_template.gendrv);
 856         if (err)
 857                 goto out_unreg;
 858
 859         return 0;
 860
 861  out_unreg:
 862         scsi_unregister_interface(&ses_interface);
 863         return err;
 864 }
 865
 866 static void __exit ses_exit(void)
 867 {
 868         scsi_unregister_driver(&ses_template.gendrv);
 869         scsi_unregister_interface(&ses_interface);
 870 }
 871
 872 module_init(ses_init);
 873 module_exit(ses_exit);
 874
 875 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
 876
 877 MODULE_AUTHOR("James Bottomley");
 878 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
 879 MODULE_LICENSE("GPL v2");