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         unsigned int retries = SES_RETRIES;
  91         struct scsi_sense_hdr sshdr;
  92         const struct scsi_exec_args exec_args = {
  93                 .sshdr = &sshdr,
  94         };
  95
  96         do {
  97                 ret = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, bufflen,
  98                                        SES_TIMEOUT, 1, &exec_args);
  99         } while (ret > 0 && --retries && scsi_sense_valid(&sshdr) &&
 100                  (sshdr.sense_key == NOT_READY ||
 101                   (sshdr.sense_key == UNIT_ATTENTION && sshdr.asc == 0x29)));
 102
 103         if (unlikely(ret))
 104                 return ret;
 105
 106         recv_page_code = ((unsigned char *)buf)[0];
 107
 108         if (likely(recv_page_code == page_code))
 109                 return ret;
 110
 111         /* successful diagnostic but wrong page code.  This happens to some
 112          * USB devices, just print a message and pretend there was an error */
 113
 114         sdev_printk(KERN_ERR, sdev,
 115                     "Wrong diagnostic page; asked for %d got %u\n",
 116                     page_code, recv_page_code);
 117
 118         return -EINVAL;
 119 }
 120
 121 static int ses_send_diag(struct scsi_device *sdev, int page_code,
 122                          void *buf, int bufflen)
 123 {
 124         int result;
 125
 126         unsigned char cmd[] = {
 127                 SEND_DIAGNOSTIC,
 128                 0x10,           /* Set PF bit */
 129                 0,
 130                 bufflen >> 8,
 131                 bufflen & 0xff,
 132                 0
 133         };
 134         struct scsi_sense_hdr sshdr;
 135         unsigned int retries = SES_RETRIES;
 136         const struct scsi_exec_args exec_args = {
 137                 .sshdr = &sshdr,
 138         };
 139
 140         do {
 141                 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, buf,
 142                                           bufflen, SES_TIMEOUT, 1, &exec_args);
 143         } while (result > 0 && --retries && scsi_sense_valid(&sshdr) &&
 144                  (sshdr.sense_key == NOT_READY ||
 145                   (sshdr.sense_key == UNIT_ATTENTION && sshdr.asc == 0x29)));
 146
 147         if (result)
 148                 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
 149                             result);
 150         return result;
 151 }
 152
 153 static int ses_set_page2_descriptor(struct enclosure_device *edev,
 154                                       struct enclosure_component *ecomp,
 155                                       unsigned char *desc)
 156 {
 157         int i, j, count = 0, descriptor = ecomp->number;
 158         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 159         struct ses_device *ses_dev = edev->scratch;
 160         unsigned char *type_ptr = ses_dev->page1_types;
 161         unsigned char *desc_ptr = ses_dev->page2 + 8;
 162
 163         /* Clear everything */
 164         memset(desc_ptr, 0, ses_dev->page2_len - 8);
 165         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 166                 for (j = 0; j < type_ptr[1]; j++) {
 167                         desc_ptr += 4;
 168                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 169                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 170                                 continue;
 171                         if (count++ == descriptor) {
 172                                 memcpy(desc_ptr, desc, 4);
 173                                 /* set select */
 174                                 desc_ptr[0] |= 0x80;
 175                                 /* clear reserved, just in case */
 176                                 desc_ptr[0] &= 0xf0;
 177                         }
 178                 }
 179         }
 180
 181         return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
 182 }
 183
 184 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
 185                                       struct enclosure_component *ecomp)
 186 {
 187         int i, j, count = 0, descriptor = ecomp->number;
 188         struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
 189         struct ses_device *ses_dev = edev->scratch;
 190         unsigned char *type_ptr = ses_dev->page1_types;
 191         unsigned char *desc_ptr = ses_dev->page2 + 8;
 192
 193         if (ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len) < 0)
 194                 return NULL;
 195
 196         for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
 197                 for (j = 0; j < type_ptr[1]; j++) {
 198                         desc_ptr += 4;
 199                         if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
 200                             type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 201                                 continue;
 202                         if (count++ == descriptor)
 203                                 return desc_ptr;
 204                 }
 205         }
 206         return NULL;
 207 }
 208
 209 /* For device slot and array device slot elements, byte 3 bit 6
 210  * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
 211  * code stands these bits are shifted 4 positions right so in
 212  * sysfs they will appear as bits 2 and 1 respectively. Strange. */
 213 static void ses_get_fault(struct enclosure_device *edev,
 214                           struct enclosure_component *ecomp)
 215 {
 216         unsigned char *desc;
 217
 218         if (!ses_page2_supported(edev)) {
 219                 ecomp->fault = 0;
 220                 return;
 221         }
 222         desc = ses_get_page2_descriptor(edev, ecomp);
 223         if (desc)
 224                 ecomp->fault = (desc[3] & 0x60) >> 4;
 225 }
 226
 227 static int ses_set_fault(struct enclosure_device *edev,
 228                           struct enclosure_component *ecomp,
 229                          enum enclosure_component_setting val)
 230 {
 231         unsigned char desc[4];
 232         unsigned char *desc_ptr;
 233
 234         if (!ses_page2_supported(edev))
 235                 return -EINVAL;
 236
 237         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 238
 239         if (!desc_ptr)
 240                 return -EIO;
 241
 242         init_device_slot_control(desc, ecomp, desc_ptr);
 243
 244         switch (val) {
 245         case ENCLOSURE_SETTING_DISABLED:
 246                 desc[3] &= 0xdf;
 247                 break;
 248         case ENCLOSURE_SETTING_ENABLED:
 249                 desc[3] |= 0x20;
 250                 break;
 251         default:
 252                 /* SES doesn't do the SGPIO blink settings */
 253                 return -EINVAL;
 254         }
 255
 256         return ses_set_page2_descriptor(edev, ecomp, desc);
 257 }
 258
 259 static void ses_get_status(struct enclosure_device *edev,
 260                            struct enclosure_component *ecomp)
 261 {
 262         unsigned char *desc;
 263
 264         if (!ses_page2_supported(edev)) {
 265                 ecomp->status = 0;
 266                 return;
 267         }
 268         desc = ses_get_page2_descriptor(edev, ecomp);
 269         if (desc)
 270                 ecomp->status = (desc[0] & 0x0f);
 271 }
 272
 273 static void ses_get_locate(struct enclosure_device *edev,
 274                            struct enclosure_component *ecomp)
 275 {
 276         unsigned char *desc;
 277
 278         if (!ses_page2_supported(edev)) {
 279                 ecomp->locate = 0;
 280                 return;
 281         }
 282         desc = ses_get_page2_descriptor(edev, ecomp);
 283         if (desc)
 284                 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
 285 }
 286
 287 static int ses_set_locate(struct enclosure_device *edev,
 288                           struct enclosure_component *ecomp,
 289                           enum enclosure_component_setting val)
 290 {
 291         unsigned char desc[4];
 292         unsigned char *desc_ptr;
 293
 294         if (!ses_page2_supported(edev))
 295                 return -EINVAL;
 296
 297         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 298
 299         if (!desc_ptr)
 300                 return -EIO;
 301
 302         init_device_slot_control(desc, ecomp, desc_ptr);
 303
 304         switch (val) {
 305         case ENCLOSURE_SETTING_DISABLED:
 306                 desc[2] &= 0xfd;
 307                 break;
 308         case ENCLOSURE_SETTING_ENABLED:
 309                 desc[2] |= 0x02;
 310                 break;
 311         default:
 312                 /* SES doesn't do the SGPIO blink settings */
 313                 return -EINVAL;
 314         }
 315         return ses_set_page2_descriptor(edev, ecomp, desc);
 316 }
 317
 318 static int ses_set_active(struct enclosure_device *edev,
 319                           struct enclosure_component *ecomp,
 320                           enum enclosure_component_setting val)
 321 {
 322         unsigned char desc[4];
 323         unsigned char *desc_ptr;
 324
 325         if (!ses_page2_supported(edev))
 326                 return -EINVAL;
 327
 328         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 329
 330         if (!desc_ptr)
 331                 return -EIO;
 332
 333         init_device_slot_control(desc, ecomp, desc_ptr);
 334
 335         switch (val) {
 336         case ENCLOSURE_SETTING_DISABLED:
 337                 desc[2] &= 0x7f;
 338                 ecomp->active = 0;
 339                 break;
 340         case ENCLOSURE_SETTING_ENABLED:
 341                 desc[2] |= 0x80;
 342                 ecomp->active = 1;
 343                 break;
 344         default:
 345                 /* SES doesn't do the SGPIO blink settings */
 346                 return -EINVAL;
 347         }
 348         return ses_set_page2_descriptor(edev, ecomp, desc);
 349 }
 350
 351 static int ses_show_id(struct enclosure_device *edev, char *buf)
 352 {
 353         struct ses_device *ses_dev = edev->scratch;
 354         unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
 355
 356         return sprintf(buf, "%#llx\n", id);
 357 }
 358
 359 static void ses_get_power_status(struct enclosure_device *edev,
 360                                  struct enclosure_component *ecomp)
 361 {
 362         unsigned char *desc;
 363
 364         if (!ses_page2_supported(edev)) {
 365                 ecomp->power_status = 0;
 366                 return;
 367         }
 368
 369         desc = ses_get_page2_descriptor(edev, ecomp);
 370         if (desc)
 371                 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
 372 }
 373
 374 static int ses_set_power_status(struct enclosure_device *edev,
 375                                 struct enclosure_component *ecomp,
 376                                 int val)
 377 {
 378         unsigned char desc[4];
 379         unsigned char *desc_ptr;
 380
 381         if (!ses_page2_supported(edev))
 382                 return -EINVAL;
 383
 384         desc_ptr = ses_get_page2_descriptor(edev, ecomp);
 385
 386         if (!desc_ptr)
 387                 return -EIO;
 388
 389         init_device_slot_control(desc, ecomp, desc_ptr);
 390
 391         switch (val) {
 392         /* power = 1 is device_off = 0 and vice versa */
 393         case 0:
 394                 desc[3] |= 0x10;
 395                 break;
 396         case 1:
 397                 desc[3] &= 0xef;
 398                 break;
 399         default:
 400                 return -EINVAL;
 401         }
 402         ecomp->power_status = val;
 403         return ses_set_page2_descriptor(edev, ecomp, desc);
 404 }
 405
 406 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
 407         .get_fault              = ses_get_fault,
 408         .set_fault              = ses_set_fault,
 409         .get_status             = ses_get_status,
 410         .get_locate             = ses_get_locate,
 411         .set_locate             = ses_set_locate,
 412         .get_power_status       = ses_get_power_status,
 413         .set_power_status       = ses_set_power_status,
 414         .set_active             = ses_set_active,
 415         .show_id                = ses_show_id,
 416 };
 417
 418 struct ses_host_edev {
 419         struct Scsi_Host *shost;
 420         struct enclosure_device *edev;
 421 };
 422
 423 #if 0
 424 int ses_match_host(struct enclosure_device *edev, void *data)
 425 {
 426         struct ses_host_edev *sed = data;
 427         struct scsi_device *sdev;
 428
 429         if (!scsi_is_sdev_device(edev->edev.parent))
 430                 return 0;
 431
 432         sdev = to_scsi_device(edev->edev.parent);
 433
 434         if (sdev->host != sed->shost)
 435                 return 0;
 436
 437         sed->edev = edev;
 438         return 1;
 439 }
 440 #endif  /*  0  */
 441
 442 static int ses_process_descriptor(struct enclosure_component *ecomp,
 443                                    unsigned char *desc, int max_desc_len)
 444 {
 445         int eip = desc[0] & 0x10;
 446         int invalid = desc[0] & 0x80;
 447         enum scsi_protocol proto = desc[0] & 0x0f;
 448         u64 addr = 0;
 449         int slot = -1;
 450         struct ses_component *scomp = ecomp->scratch;
 451         unsigned char *d;
 452
 453         if (invalid)
 454                 return 0;
 455
 456         switch (proto) {
 457         case SCSI_PROTOCOL_FCP:
 458                 if (eip) {
 459                         if (max_desc_len <= 7)
 460                                 return 1;
 461                         d = desc + 4;
 462                         slot = d[3];
 463                 }
 464                 break;
 465         case SCSI_PROTOCOL_SAS:
 466
 467                 if (eip) {
 468                         if (max_desc_len <= 27)
 469                                 return 1;
 470                         d = desc + 4;
 471                         slot = d[3];
 472                         d = desc + 8;
 473                 } else {
 474                         if (max_desc_len <= 23)
 475                                 return 1;
 476                         d = desc + 4;
 477                 }
 478
 479
 480                 /* only take the phy0 addr */
 481                 addr = (u64)d[12] << 56 |
 482                         (u64)d[13] << 48 |
 483                         (u64)d[14] << 40 |
 484                         (u64)d[15] << 32 |
 485                         (u64)d[16] << 24 |
 486                         (u64)d[17] << 16 |
 487                         (u64)d[18] << 8 |
 488                         (u64)d[19];
 489                 break;
 490         default:
 491                 /* FIXME: Need to add more protocols than just SAS */
 492                 break;
 493         }
 494         ecomp->slot = slot;
 495         scomp->addr = addr;
 496
 497         return 0;
 498 }
 499
 500 struct efd {
 501         u64 addr;
 502         struct device *dev;
 503 };
 504
 505 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
 506                                       void *data)
 507 {
 508         struct efd *efd = data;
 509         int i;
 510         struct ses_component *scomp;
 511
 512         for (i = 0; i < edev->components; i++) {
 513                 scomp = edev->component[i].scratch;
 514                 if (scomp->addr != efd->addr)
 515                         continue;
 516
 517                 if (enclosure_add_device(edev, i, efd->dev) == 0)
 518                         kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
 519                 return 1;
 520         }
 521         return 0;
 522 }
 523
 524 #define INIT_ALLOC_SIZE 32
 525
 526 static void ses_enclosure_data_process(struct enclosure_device *edev,
 527                                        struct scsi_device *sdev,
 528                                        int create)
 529 {
 530         u32 result;
 531         unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
 532         int i, j, page7_len, len, components;
 533         struct ses_device *ses_dev = edev->scratch;
 534         int types = ses_dev->page1_num_types;
 535         unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 536
 537         if (!hdr_buf)
 538                 goto simple_populate;
 539
 540         /* re-read page 10 */
 541         if (ses_dev->page10)
 542                 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
 543         /* Page 7 for the descriptors is optional */
 544         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
 545         if (result)
 546                 goto simple_populate;
 547
 548         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 549         /* add 1 for trailing '\0' we'll use */
 550         buf = kzalloc(len + 1, GFP_KERNEL);
 551         if (!buf)
 552                 goto simple_populate;
 553         result = ses_recv_diag(sdev, 7, buf, len);
 554         if (result) {
 555  simple_populate:
 556                 kfree(buf);
 557                 buf = NULL;
 558                 desc_ptr = NULL;
 559                 len = 0;
 560                 page7_len = 0;
 561         } else {
 562                 desc_ptr = buf + 8;
 563                 len = (desc_ptr[2] << 8) + desc_ptr[3];
 564                 /* skip past overall descriptor */
 565                 desc_ptr += len + 4;
 566         }
 567         if (ses_dev->page10 && ses_dev->page10_len > 9)
 568                 addl_desc_ptr = ses_dev->page10 + 8;
 569         type_ptr = ses_dev->page1_types;
 570         components = 0;
 571         for (i = 0; i < types; i++, type_ptr += 4) {
 572                 for (j = 0; j < type_ptr[1]; j++) {
 573                         char *name = NULL;
 574                         struct enclosure_component *ecomp;
 575                         int max_desc_len;
 576
 577                         if (desc_ptr) {
 578                                 if (desc_ptr + 3 >= buf + page7_len) {
 579                                         desc_ptr = NULL;
 580                                 } else {
 581                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
 582                                         desc_ptr += 4;
 583                                         if (desc_ptr + len > buf + page7_len)
 584                                                 desc_ptr = NULL;
 585                                         else {
 586                                                 /* Add trailing zero - pushes into
 587                                                  * reserved space */
 588                                                 desc_ptr[len] = '\0';
 589                                                 name = desc_ptr;
 590                                         }
 591                                 }
 592                         }
 593                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 594                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
 595
 596                                 if (create)
 597                                         ecomp = enclosure_component_alloc(
 598                                                 edev,
 599                                                 components++,
 600                                                 type_ptr[0],
 601                                                 name);
 602                                 else if (components < edev->components)
 603                                         ecomp = &edev->component[components++];
 604                                 else
 605                                         ecomp = ERR_PTR(-EINVAL);
 606
 607                                 if (!IS_ERR(ecomp)) {
 608                                         if (addl_desc_ptr) {
 609                                                 max_desc_len = ses_dev->page10_len -
 610                                                     (addl_desc_ptr - ses_dev->page10);
 611                                                 if (ses_process_descriptor(ecomp,
 612                                                     addl_desc_ptr,
 613                                                     max_desc_len))
 614                                                         addl_desc_ptr = NULL;
 615                                         }
 616                                         if (create)
 617                                                 enclosure_component_register(
 618                                                         ecomp);
 619                                 }
 620                         }
 621                         if (desc_ptr)
 622                                 desc_ptr += len;
 623
 624                         if (addl_desc_ptr &&
 625                             /* only find additional descriptions for specific devices */
 626                             (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 627                              type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
 628                              type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
 629                              /* these elements are optional */
 630                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
 631                              type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
 632                              type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS)) {
 633                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
 634                                 if (addl_desc_ptr + 1 >= ses_dev->page10 + ses_dev->page10_len)
 635                                         addl_desc_ptr = NULL;
 636                         }
 637                 }
 638         }
 639         kfree(buf);
 640         kfree(hdr_buf);
 641 }
 642
 643 static void ses_match_to_enclosure(struct enclosure_device *edev,
 644                                    struct scsi_device *sdev,
 645                                    int refresh)
 646 {
 647         struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
 648         struct efd efd = {
 649                 .addr = 0,
 650         };
 651
 652         if (refresh)
 653                 ses_enclosure_data_process(edev, edev_sdev, 0);
 654
 655         if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
 656                 efd.addr = sas_get_address(sdev);
 657
 658         if (efd.addr) {
 659                 efd.dev = &sdev->sdev_gendev;
 660
 661                 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
 662         }
 663 }
 664
 665 static int ses_intf_add(struct device *cdev)
 666 {
 667         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 668         struct scsi_device *tmp_sdev;
 669         unsigned char *buf = NULL, *hdr_buf, *type_ptr, page;
 670         struct ses_device *ses_dev;
 671         u32 result;
 672         int i, types, len, components = 0;
 673         int err = -ENOMEM;
 674         int num_enclosures;
 675         struct enclosure_device *edev;
 676         struct ses_component *scomp = NULL;
 677
 678         if (!scsi_device_enclosure(sdev)) {
 679                 /* not an enclosure, but might be in one */
 680                 struct enclosure_device *prev = NULL;
 681
 682                 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 683                         ses_match_to_enclosure(edev, sdev, 1);
 684                         prev = edev;
 685                 }
 686                 return -ENODEV;
 687         }
 688
 689         /* TYPE_ENCLOSURE prints a message in probe */
 690         if (sdev->type != TYPE_ENCLOSURE)
 691                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
 692
 693         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
 694         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
 695         if (!hdr_buf || !ses_dev)
 696                 goto err_init_free;
 697
 698         page = 1;
 699         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 700         if (result)
 701                 goto recv_failed;
 702
 703         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 704         buf = kzalloc(len, GFP_KERNEL);
 705         if (!buf)
 706                 goto err_free;
 707
 708         result = ses_recv_diag(sdev, page, buf, len);
 709         if (result)
 710                 goto recv_failed;
 711
 712         types = 0;
 713
 714         /* we always have one main enclosure and the rest are referred
 715          * to as secondary subenclosures */
 716         num_enclosures = buf[1] + 1;
 717
 718         /* begin at the enclosure descriptor */
 719         type_ptr = buf + 8;
 720         /* skip all the enclosure descriptors */
 721         for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
 722                 types += type_ptr[2];
 723                 type_ptr += type_ptr[3] + 4;
 724         }
 725
 726         ses_dev->page1_types = type_ptr;
 727         ses_dev->page1_num_types = types;
 728
 729         for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
 730                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
 731                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
 732                         components += type_ptr[1];
 733         }
 734
 735         ses_dev->page1 = buf;
 736         ses_dev->page1_len = len;
 737         buf = NULL;
 738
 739         page = 2;
 740         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 741         if (result)
 742                 goto page2_not_supported;
 743
 744         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 745         buf = kzalloc(len, GFP_KERNEL);
 746         if (!buf)
 747                 goto err_free;
 748
 749         /* make sure getting page 2 actually works */
 750         result = ses_recv_diag(sdev, 2, buf, len);
 751         if (result)
 752                 goto recv_failed;
 753         ses_dev->page2 = buf;
 754         ses_dev->page2_len = len;
 755         buf = NULL;
 756
 757         /* The additional information page --- allows us
 758          * to match up the devices */
 759         page = 10;
 760         result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
 761         if (!result) {
 762
 763                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
 764                 buf = kzalloc(len, GFP_KERNEL);
 765                 if (!buf)
 766                         goto err_free;
 767
 768                 result = ses_recv_diag(sdev, page, buf, len);
 769                 if (result)
 770                         goto recv_failed;
 771                 ses_dev->page10 = buf;
 772                 ses_dev->page10_len = len;
 773                 buf = NULL;
 774         }
 775 page2_not_supported:
 776         if (components > 0) {
 777                 scomp = kcalloc(components, sizeof(struct ses_component), GFP_KERNEL);
 778                 if (!scomp)
 779                         goto err_free;
 780         }
 781
 782         edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
 783                                   components, &ses_enclosure_callbacks);
 784         if (IS_ERR(edev)) {
 785                 err = PTR_ERR(edev);
 786                 goto err_free;
 787         }
 788
 789         kfree(hdr_buf);
 790
 791         edev->scratch = ses_dev;
 792         for (i = 0; i < components; i++)
 793                 edev->component[i].scratch = scomp + i;
 794
 795         ses_enclosure_data_process(edev, sdev, 1);
 796
 797         /* see if there are any devices matching before
 798          * we found the enclosure */
 799         shost_for_each_device(tmp_sdev, sdev->host) {
 800                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
 801                         continue;
 802                 ses_match_to_enclosure(edev, tmp_sdev, 0);
 803         }
 804
 805         return 0;
 806
 807  recv_failed:
 808         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
 809                     page);
 810         err = -ENODEV;
 811  err_free:
 812         kfree(buf);
 813         kfree(scomp);
 814         kfree(ses_dev->page10);
 815         kfree(ses_dev->page2);
 816         kfree(ses_dev->page1);
 817  err_init_free:
 818         kfree(ses_dev);
 819         kfree(hdr_buf);
 820         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
 821         return err;
 822 }
 823
 824 static int ses_remove(struct device *dev)
 825 {
 826         return 0;
 827 }
 828
 829 static void ses_intf_remove_component(struct scsi_device *sdev)
 830 {
 831         struct enclosure_device *edev, *prev = NULL;
 832
 833         while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
 834                 prev = edev;
 835                 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
 836                         break;
 837         }
 838         if (edev)
 839                 put_device(&edev->edev);
 840 }
 841
 842 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
 843 {
 844         struct enclosure_device *edev;
 845         struct ses_device *ses_dev;
 846
 847         /*  exact match to this enclosure */
 848         edev = enclosure_find(&sdev->sdev_gendev, NULL);
 849         if (!edev)
 850                 return;
 851
 852         ses_dev = edev->scratch;
 853         edev->scratch = NULL;
 854
 855         kfree(ses_dev->page10);
 856         kfree(ses_dev->page1);
 857         kfree(ses_dev->page2);
 858         kfree(ses_dev);
 859
 860         if (edev->components)
 861                 kfree(edev->component[0].scratch);
 862
 863         put_device(&edev->edev);
 864         enclosure_unregister(edev);
 865 }
 866
 867 static void ses_intf_remove(struct device *cdev)
 868 {
 869         struct scsi_device *sdev = to_scsi_device(cdev->parent);
 870
 871         if (!scsi_device_enclosure(sdev))
 872                 ses_intf_remove_component(sdev);
 873         else
 874                 ses_intf_remove_enclosure(sdev);
 875 }
 876
 877 static struct class_interface ses_interface = {
 878         .add_dev        = ses_intf_add,
 879         .remove_dev     = ses_intf_remove,
 880 };
 881
 882 static struct scsi_driver ses_template = {
 883         .gendrv = {
 884                 .name           = "ses",
 885                 .owner          = THIS_MODULE,
 886                 .probe          = ses_probe,
 887                 .remove         = ses_remove,
 888         },
 889 };
 890
 891 static int __init ses_init(void)
 892 {
 893         int err;
 894
 895         err = scsi_register_interface(&ses_interface);
 896         if (err)
 897                 return err;
 898
 899         err = scsi_register_driver(&ses_template.gendrv);
 900         if (err)
 901                 goto out_unreg;
 902
 903         return 0;
 904
 905  out_unreg:
 906         scsi_unregister_interface(&ses_interface);
 907         return err;
 908 }
 909
 910 static void __exit ses_exit(void)
 911 {
 912         scsi_unregister_driver(&ses_template.gendrv);
 913         scsi_unregister_interface(&ses_interface);
 914 }
 915
 916 module_init(ses_init);
 917 module_exit(ses_exit);
 918
 919 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
 920
 921 MODULE_AUTHOR("James Bottomley");
 922 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
 923 MODULE_LICENSE("GPL v2");