| 1 | /* |
| 2 | * SCSI Enclosure Services |
| 3 | * |
| 4 | * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com> |
| 5 | * |
| 6 | **----------------------------------------------------------------------------- |
| 7 | ** |
| 8 | ** This program is free software; you can redistribute it and/or |
| 9 | ** modify it under the terms of the GNU General Public License |
| 10 | ** version 2 as published by the Free Software Foundation. |
| 11 | ** |
| 12 | ** This program is distributed in the hope that it will be useful, |
| 13 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | ** GNU General Public License for more details. |
| 16 | ** |
| 17 | ** You should have received a copy of the GNU General Public License |
| 18 | ** along with this program; if not, write to the Free Software |
| 19 | ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | ** |
| 21 | **----------------------------------------------------------------------------- |
| 22 | */ |
| 23 | |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/enclosure.h> |
| 28 | |
| 29 | #include <scsi/scsi.h> |
| 30 | #include <scsi/scsi_cmnd.h> |
| 31 | #include <scsi/scsi_dbg.h> |
| 32 | #include <scsi/scsi_device.h> |
| 33 | #include <scsi/scsi_driver.h> |
| 34 | #include <scsi/scsi_host.h> |
| 35 | |
| 36 | struct ses_device { |
| 37 | unsigned char *page1; |
| 38 | unsigned char *page1_types; |
| 39 | unsigned char *page2; |
| 40 | unsigned char *page10; |
| 41 | short page1_len; |
| 42 | short page1_num_types; |
| 43 | short page2_len; |
| 44 | short page10_len; |
| 45 | }; |
| 46 | |
| 47 | struct ses_component { |
| 48 | u64 addr; |
| 49 | unsigned char *desc; |
| 50 | }; |
| 51 | |
| 52 | static int ses_probe(struct device *dev) |
| 53 | { |
| 54 | struct scsi_device *sdev = to_scsi_device(dev); |
| 55 | int err = -ENODEV; |
| 56 | |
| 57 | if (sdev->type != TYPE_ENCLOSURE) |
| 58 | goto out; |
| 59 | |
| 60 | err = 0; |
| 61 | sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n"); |
| 62 | |
| 63 | out: |
| 64 | return err; |
| 65 | } |
| 66 | |
| 67 | #define SES_TIMEOUT (30 * HZ) |
| 68 | #define SES_RETRIES 3 |
| 69 | |
| 70 | static int ses_recv_diag(struct scsi_device *sdev, int page_code, |
| 71 | void *buf, int bufflen) |
| 72 | { |
| 73 | int ret; |
| 74 | unsigned char cmd[] = { |
| 75 | RECEIVE_DIAGNOSTIC, |
| 76 | 1, /* Set PCV bit */ |
| 77 | page_code, |
| 78 | bufflen >> 8, |
| 79 | bufflen & 0xff, |
| 80 | 0 |
| 81 | }; |
| 82 | unsigned char recv_page_code; |
| 83 | |
| 84 | ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen, |
| 85 | NULL, SES_TIMEOUT, SES_RETRIES, NULL); |
| 86 | if (unlikely(!ret)) |
| 87 | return ret; |
| 88 | |
| 89 | recv_page_code = ((unsigned char *)buf)[0]; |
| 90 | |
| 91 | if (likely(recv_page_code == page_code)) |
| 92 | return ret; |
| 93 | |
| 94 | /* successful diagnostic but wrong page code. This happens to some |
| 95 | * USB devices, just print a message and pretend there was an error */ |
| 96 | |
| 97 | sdev_printk(KERN_ERR, sdev, |
| 98 | "Wrong diagnostic page; asked for %d got %u\n", |
| 99 | page_code, recv_page_code); |
| 100 | |
| 101 | return -EINVAL; |
| 102 | } |
| 103 | |
| 104 | static int ses_send_diag(struct scsi_device *sdev, int page_code, |
| 105 | void *buf, int bufflen) |
| 106 | { |
| 107 | u32 result; |
| 108 | |
| 109 | unsigned char cmd[] = { |
| 110 | SEND_DIAGNOSTIC, |
| 111 | 0x10, /* Set PF bit */ |
| 112 | 0, |
| 113 | bufflen >> 8, |
| 114 | bufflen & 0xff, |
| 115 | 0 |
| 116 | }; |
| 117 | |
| 118 | result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen, |
| 119 | NULL, SES_TIMEOUT, SES_RETRIES, NULL); |
| 120 | if (result) |
| 121 | sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n", |
| 122 | result); |
| 123 | return result; |
| 124 | } |
| 125 | |
| 126 | static int ses_set_page2_descriptor(struct enclosure_device *edev, |
| 127 | struct enclosure_component *ecomp, |
| 128 | unsigned char *desc) |
| 129 | { |
| 130 | int i, j, count = 0, descriptor = ecomp->number; |
| 131 | struct scsi_device *sdev = to_scsi_device(edev->edev.parent); |
| 132 | struct ses_device *ses_dev = edev->scratch; |
| 133 | unsigned char *type_ptr = ses_dev->page1_types; |
| 134 | unsigned char *desc_ptr = ses_dev->page2 + 8; |
| 135 | |
| 136 | /* Clear everything */ |
| 137 | memset(desc_ptr, 0, ses_dev->page2_len - 8); |
| 138 | for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) { |
| 139 | for (j = 0; j < type_ptr[1]; j++) { |
| 140 | desc_ptr += 4; |
| 141 | if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE && |
| 142 | type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE) |
| 143 | continue; |
| 144 | if (count++ == descriptor) { |
| 145 | memcpy(desc_ptr, desc, 4); |
| 146 | /* set select */ |
| 147 | desc_ptr[0] |= 0x80; |
| 148 | /* clear reserved, just in case */ |
| 149 | desc_ptr[0] &= 0xf0; |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len); |
| 155 | } |
| 156 | |
| 157 | static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev, |
| 158 | struct enclosure_component *ecomp) |
| 159 | { |
| 160 | int i, j, count = 0, descriptor = ecomp->number; |
| 161 | struct scsi_device *sdev = to_scsi_device(edev->edev.parent); |
| 162 | struct ses_device *ses_dev = edev->scratch; |
| 163 | unsigned char *type_ptr = ses_dev->page1_types; |
| 164 | unsigned char *desc_ptr = ses_dev->page2 + 8; |
| 165 | |
| 166 | ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len); |
| 167 | |
| 168 | for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) { |
| 169 | for (j = 0; j < type_ptr[1]; j++) { |
| 170 | desc_ptr += 4; |
| 171 | if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE && |
| 172 | type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE) |
| 173 | continue; |
| 174 | if (count++ == descriptor) |
| 175 | return desc_ptr; |
| 176 | } |
| 177 | } |
| 178 | return NULL; |
| 179 | } |
| 180 | |
| 181 | /* For device slot and array device slot elements, byte 3 bit 6 |
| 182 | * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this |
| 183 | * code stands these bits are shifted 4 positions right so in |
| 184 | * sysfs they will appear as bits 2 and 1 respectively. Strange. */ |
| 185 | static void ses_get_fault(struct enclosure_device *edev, |
| 186 | struct enclosure_component *ecomp) |
| 187 | { |
| 188 | unsigned char *desc; |
| 189 | |
| 190 | desc = ses_get_page2_descriptor(edev, ecomp); |
| 191 | if (desc) |
| 192 | ecomp->fault = (desc[3] & 0x60) >> 4; |
| 193 | } |
| 194 | |
| 195 | static int ses_set_fault(struct enclosure_device *edev, |
| 196 | struct enclosure_component *ecomp, |
| 197 | enum enclosure_component_setting val) |
| 198 | { |
| 199 | unsigned char desc[4] = {0 }; |
| 200 | |
| 201 | switch (val) { |
| 202 | case ENCLOSURE_SETTING_DISABLED: |
| 203 | /* zero is disabled */ |
| 204 | break; |
| 205 | case ENCLOSURE_SETTING_ENABLED: |
| 206 | desc[3] = 0x20; |
| 207 | break; |
| 208 | default: |
| 209 | /* SES doesn't do the SGPIO blink settings */ |
| 210 | return -EINVAL; |
| 211 | } |
| 212 | |
| 213 | return ses_set_page2_descriptor(edev, ecomp, desc); |
| 214 | } |
| 215 | |
| 216 | static void ses_get_status(struct enclosure_device *edev, |
| 217 | struct enclosure_component *ecomp) |
| 218 | { |
| 219 | unsigned char *desc; |
| 220 | |
| 221 | desc = ses_get_page2_descriptor(edev, ecomp); |
| 222 | if (desc) |
| 223 | ecomp->status = (desc[0] & 0x0f); |
| 224 | } |
| 225 | |
| 226 | static void ses_get_locate(struct enclosure_device *edev, |
| 227 | struct enclosure_component *ecomp) |
| 228 | { |
| 229 | unsigned char *desc; |
| 230 | |
| 231 | desc = ses_get_page2_descriptor(edev, ecomp); |
| 232 | if (desc) |
| 233 | ecomp->locate = (desc[2] & 0x02) ? 1 : 0; |
| 234 | } |
| 235 | |
| 236 | static int ses_set_locate(struct enclosure_device *edev, |
| 237 | struct enclosure_component *ecomp, |
| 238 | enum enclosure_component_setting val) |
| 239 | { |
| 240 | unsigned char desc[4] = {0 }; |
| 241 | |
| 242 | switch (val) { |
| 243 | case ENCLOSURE_SETTING_DISABLED: |
| 244 | /* zero is disabled */ |
| 245 | break; |
| 246 | case ENCLOSURE_SETTING_ENABLED: |
| 247 | desc[2] = 0x02; |
| 248 | break; |
| 249 | default: |
| 250 | /* SES doesn't do the SGPIO blink settings */ |
| 251 | return -EINVAL; |
| 252 | } |
| 253 | return ses_set_page2_descriptor(edev, ecomp, desc); |
| 254 | } |
| 255 | |
| 256 | static int ses_set_active(struct enclosure_device *edev, |
| 257 | struct enclosure_component *ecomp, |
| 258 | enum enclosure_component_setting val) |
| 259 | { |
| 260 | unsigned char desc[4] = {0 }; |
| 261 | |
| 262 | switch (val) { |
| 263 | case ENCLOSURE_SETTING_DISABLED: |
| 264 | /* zero is disabled */ |
| 265 | ecomp->active = 0; |
| 266 | break; |
| 267 | case ENCLOSURE_SETTING_ENABLED: |
| 268 | desc[2] = 0x80; |
| 269 | ecomp->active = 1; |
| 270 | break; |
| 271 | default: |
| 272 | /* SES doesn't do the SGPIO blink settings */ |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | return ses_set_page2_descriptor(edev, ecomp, desc); |
| 276 | } |
| 277 | |
| 278 | static struct enclosure_component_callbacks ses_enclosure_callbacks = { |
| 279 | .get_fault = ses_get_fault, |
| 280 | .set_fault = ses_set_fault, |
| 281 | .get_status = ses_get_status, |
| 282 | .get_locate = ses_get_locate, |
| 283 | .set_locate = ses_set_locate, |
| 284 | .set_active = ses_set_active, |
| 285 | }; |
| 286 | |
| 287 | struct ses_host_edev { |
| 288 | struct Scsi_Host *shost; |
| 289 | struct enclosure_device *edev; |
| 290 | }; |
| 291 | |
| 292 | #if 0 |
| 293 | int ses_match_host(struct enclosure_device *edev, void *data) |
| 294 | { |
| 295 | struct ses_host_edev *sed = data; |
| 296 | struct scsi_device *sdev; |
| 297 | |
| 298 | if (!scsi_is_sdev_device(edev->edev.parent)) |
| 299 | return 0; |
| 300 | |
| 301 | sdev = to_scsi_device(edev->edev.parent); |
| 302 | |
| 303 | if (sdev->host != sed->shost) |
| 304 | return 0; |
| 305 | |
| 306 | sed->edev = edev; |
| 307 | return 1; |
| 308 | } |
| 309 | #endif /* 0 */ |
| 310 | |
| 311 | static void ses_process_descriptor(struct enclosure_component *ecomp, |
| 312 | unsigned char *desc) |
| 313 | { |
| 314 | int eip = desc[0] & 0x10; |
| 315 | int invalid = desc[0] & 0x80; |
| 316 | enum scsi_protocol proto = desc[0] & 0x0f; |
| 317 | u64 addr = 0; |
| 318 | struct ses_component *scomp = ecomp->scratch; |
| 319 | unsigned char *d; |
| 320 | |
| 321 | scomp->desc = desc; |
| 322 | |
| 323 | if (invalid) |
| 324 | return; |
| 325 | |
| 326 | switch (proto) { |
| 327 | case SCSI_PROTOCOL_SAS: |
| 328 | if (eip) |
| 329 | d = desc + 8; |
| 330 | else |
| 331 | d = desc + 4; |
| 332 | /* only take the phy0 addr */ |
| 333 | addr = (u64)d[12] << 56 | |
| 334 | (u64)d[13] << 48 | |
| 335 | (u64)d[14] << 40 | |
| 336 | (u64)d[15] << 32 | |
| 337 | (u64)d[16] << 24 | |
| 338 | (u64)d[17] << 16 | |
| 339 | (u64)d[18] << 8 | |
| 340 | (u64)d[19]; |
| 341 | break; |
| 342 | default: |
| 343 | /* FIXME: Need to add more protocols than just SAS */ |
| 344 | break; |
| 345 | } |
| 346 | scomp->addr = addr; |
| 347 | } |
| 348 | |
| 349 | struct efd { |
| 350 | u64 addr; |
| 351 | struct device *dev; |
| 352 | }; |
| 353 | |
| 354 | static int ses_enclosure_find_by_addr(struct enclosure_device *edev, |
| 355 | void *data) |
| 356 | { |
| 357 | struct efd *efd = data; |
| 358 | int i; |
| 359 | struct ses_component *scomp; |
| 360 | |
| 361 | if (!edev->component[0].scratch) |
| 362 | return 0; |
| 363 | |
| 364 | for (i = 0; i < edev->components; i++) { |
| 365 | scomp = edev->component[i].scratch; |
| 366 | if (scomp->addr != efd->addr) |
| 367 | continue; |
| 368 | |
| 369 | enclosure_add_device(edev, i, efd->dev); |
| 370 | return 1; |
| 371 | } |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | #define INIT_ALLOC_SIZE 32 |
| 376 | |
| 377 | static void ses_enclosure_data_process(struct enclosure_device *edev, |
| 378 | struct scsi_device *sdev, |
| 379 | int create) |
| 380 | { |
| 381 | u32 result; |
| 382 | unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL; |
| 383 | int i, j, page7_len, len, components; |
| 384 | struct ses_device *ses_dev = edev->scratch; |
| 385 | int types = ses_dev->page1_num_types; |
| 386 | unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL); |
| 387 | |
| 388 | if (!hdr_buf) |
| 389 | goto simple_populate; |
| 390 | |
| 391 | /* re-read page 10 */ |
| 392 | if (ses_dev->page10) |
| 393 | ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len); |
| 394 | /* Page 7 for the descriptors is optional */ |
| 395 | result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE); |
| 396 | if (result) |
| 397 | goto simple_populate; |
| 398 | |
| 399 | page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4; |
| 400 | /* add 1 for trailing '\0' we'll use */ |
| 401 | buf = kzalloc(len + 1, GFP_KERNEL); |
| 402 | if (!buf) |
| 403 | goto simple_populate; |
| 404 | result = ses_recv_diag(sdev, 7, buf, len); |
| 405 | if (result) { |
| 406 | simple_populate: |
| 407 | kfree(buf); |
| 408 | buf = NULL; |
| 409 | desc_ptr = NULL; |
| 410 | len = 0; |
| 411 | page7_len = 0; |
| 412 | } else { |
| 413 | desc_ptr = buf + 8; |
| 414 | len = (desc_ptr[2] << 8) + desc_ptr[3]; |
| 415 | /* skip past overall descriptor */ |
| 416 | desc_ptr += len + 4; |
| 417 | } |
| 418 | if (ses_dev->page10) |
| 419 | addl_desc_ptr = ses_dev->page10 + 8; |
| 420 | type_ptr = ses_dev->page1_types; |
| 421 | components = 0; |
| 422 | for (i = 0; i < types; i++, type_ptr += 4) { |
| 423 | for (j = 0; j < type_ptr[1]; j++) { |
| 424 | char *name = NULL; |
| 425 | struct enclosure_component *ecomp; |
| 426 | |
| 427 | if (desc_ptr) { |
| 428 | if (desc_ptr >= buf + page7_len) { |
| 429 | desc_ptr = NULL; |
| 430 | } else { |
| 431 | len = (desc_ptr[2] << 8) + desc_ptr[3]; |
| 432 | desc_ptr += 4; |
| 433 | /* Add trailing zero - pushes into |
| 434 | * reserved space */ |
| 435 | desc_ptr[len] = '\0'; |
| 436 | name = desc_ptr; |
| 437 | } |
| 438 | } |
| 439 | if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE || |
| 440 | type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) { |
| 441 | |
| 442 | if (create) |
| 443 | ecomp = enclosure_component_register(edev, |
| 444 | components++, |
| 445 | type_ptr[0], |
| 446 | name); |
| 447 | else |
| 448 | ecomp = &edev->component[components++]; |
| 449 | |
| 450 | if (!IS_ERR(ecomp) && addl_desc_ptr) |
| 451 | ses_process_descriptor(ecomp, |
| 452 | addl_desc_ptr); |
| 453 | } |
| 454 | if (desc_ptr) |
| 455 | desc_ptr += len; |
| 456 | |
| 457 | if (addl_desc_ptr && |
| 458 | /* only find additional descriptions for specific devices */ |
| 459 | (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE || |
| 460 | type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE || |
| 461 | type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER || |
| 462 | /* these elements are optional */ |
| 463 | type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT || |
| 464 | type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT || |
| 465 | type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS)) |
| 466 | addl_desc_ptr += addl_desc_ptr[1] + 2; |
| 467 | |
| 468 | } |
| 469 | } |
| 470 | kfree(buf); |
| 471 | kfree(hdr_buf); |
| 472 | } |
| 473 | |
| 474 | static void ses_match_to_enclosure(struct enclosure_device *edev, |
| 475 | struct scsi_device *sdev) |
| 476 | { |
| 477 | unsigned char *buf; |
| 478 | unsigned char *desc; |
| 479 | unsigned int vpd_len; |
| 480 | struct efd efd = { |
| 481 | .addr = 0, |
| 482 | }; |
| 483 | |
| 484 | buf = kmalloc(INIT_ALLOC_SIZE, GFP_KERNEL); |
| 485 | if (!buf || scsi_get_vpd_page(sdev, 0x83, buf, INIT_ALLOC_SIZE)) |
| 486 | goto free; |
| 487 | |
| 488 | ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0); |
| 489 | |
| 490 | vpd_len = ((buf[2] << 8) | buf[3]) + 4; |
| 491 | kfree(buf); |
| 492 | buf = kmalloc(vpd_len, GFP_KERNEL); |
| 493 | if (!buf ||scsi_get_vpd_page(sdev, 0x83, buf, vpd_len)) |
| 494 | goto free; |
| 495 | |
| 496 | desc = buf + 4; |
| 497 | while (desc < buf + vpd_len) { |
| 498 | enum scsi_protocol proto = desc[0] >> 4; |
| 499 | u8 code_set = desc[0] & 0x0f; |
| 500 | u8 piv = desc[1] & 0x80; |
| 501 | u8 assoc = (desc[1] & 0x30) >> 4; |
| 502 | u8 type = desc[1] & 0x0f; |
| 503 | u8 len = desc[3]; |
| 504 | |
| 505 | if (piv && code_set == 1 && assoc == 1 |
| 506 | && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8) |
| 507 | efd.addr = (u64)desc[4] << 56 | |
| 508 | (u64)desc[5] << 48 | |
| 509 | (u64)desc[6] << 40 | |
| 510 | (u64)desc[7] << 32 | |
| 511 | (u64)desc[8] << 24 | |
| 512 | (u64)desc[9] << 16 | |
| 513 | (u64)desc[10] << 8 | |
| 514 | (u64)desc[11]; |
| 515 | |
| 516 | desc += len + 4; |
| 517 | } |
| 518 | if (!efd.addr) |
| 519 | goto free; |
| 520 | |
| 521 | efd.dev = &sdev->sdev_gendev; |
| 522 | |
| 523 | enclosure_for_each_device(ses_enclosure_find_by_addr, &efd); |
| 524 | free: |
| 525 | kfree(buf); |
| 526 | } |
| 527 | |
| 528 | static int ses_intf_add(struct device *cdev, |
| 529 | struct class_interface *intf) |
| 530 | { |
| 531 | struct scsi_device *sdev = to_scsi_device(cdev->parent); |
| 532 | struct scsi_device *tmp_sdev; |
| 533 | unsigned char *buf = NULL, *hdr_buf, *type_ptr; |
| 534 | struct ses_device *ses_dev; |
| 535 | u32 result; |
| 536 | int i, types, len, components = 0; |
| 537 | int err = -ENOMEM; |
| 538 | int num_enclosures; |
| 539 | struct enclosure_device *edev; |
| 540 | struct ses_component *scomp = NULL; |
| 541 | |
| 542 | if (!scsi_device_enclosure(sdev)) { |
| 543 | /* not an enclosure, but might be in one */ |
| 544 | struct enclosure_device *prev = NULL; |
| 545 | |
| 546 | while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) { |
| 547 | ses_match_to_enclosure(edev, sdev); |
| 548 | prev = edev; |
| 549 | } |
| 550 | return -ENODEV; |
| 551 | } |
| 552 | |
| 553 | /* TYPE_ENCLOSURE prints a message in probe */ |
| 554 | if (sdev->type != TYPE_ENCLOSURE) |
| 555 | sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n"); |
| 556 | |
| 557 | ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL); |
| 558 | hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL); |
| 559 | if (!hdr_buf || !ses_dev) |
| 560 | goto err_init_free; |
| 561 | |
| 562 | result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE); |
| 563 | if (result) |
| 564 | goto recv_failed; |
| 565 | |
| 566 | len = (hdr_buf[2] << 8) + hdr_buf[3] + 4; |
| 567 | buf = kzalloc(len, GFP_KERNEL); |
| 568 | if (!buf) |
| 569 | goto err_free; |
| 570 | |
| 571 | result = ses_recv_diag(sdev, 1, buf, len); |
| 572 | if (result) |
| 573 | goto recv_failed; |
| 574 | |
| 575 | types = 0; |
| 576 | |
| 577 | /* we always have one main enclosure and the rest are referred |
| 578 | * to as secondary subenclosures */ |
| 579 | num_enclosures = buf[1] + 1; |
| 580 | |
| 581 | /* begin at the enclosure descriptor */ |
| 582 | type_ptr = buf + 8; |
| 583 | /* skip all the enclosure descriptors */ |
| 584 | for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) { |
| 585 | types += type_ptr[2]; |
| 586 | type_ptr += type_ptr[3] + 4; |
| 587 | } |
| 588 | |
| 589 | ses_dev->page1_types = type_ptr; |
| 590 | ses_dev->page1_num_types = types; |
| 591 | |
| 592 | for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) { |
| 593 | if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE || |
| 594 | type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) |
| 595 | components += type_ptr[1]; |
| 596 | } |
| 597 | ses_dev->page1 = buf; |
| 598 | ses_dev->page1_len = len; |
| 599 | buf = NULL; |
| 600 | |
| 601 | result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE); |
| 602 | if (result) |
| 603 | goto recv_failed; |
| 604 | |
| 605 | len = (hdr_buf[2] << 8) + hdr_buf[3] + 4; |
| 606 | buf = kzalloc(len, GFP_KERNEL); |
| 607 | if (!buf) |
| 608 | goto err_free; |
| 609 | |
| 610 | /* make sure getting page 2 actually works */ |
| 611 | result = ses_recv_diag(sdev, 2, buf, len); |
| 612 | if (result) |
| 613 | goto recv_failed; |
| 614 | ses_dev->page2 = buf; |
| 615 | ses_dev->page2_len = len; |
| 616 | buf = NULL; |
| 617 | |
| 618 | /* The additional information page --- allows us |
| 619 | * to match up the devices */ |
| 620 | result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE); |
| 621 | if (!result) { |
| 622 | |
| 623 | len = (hdr_buf[2] << 8) + hdr_buf[3] + 4; |
| 624 | buf = kzalloc(len, GFP_KERNEL); |
| 625 | if (!buf) |
| 626 | goto err_free; |
| 627 | |
| 628 | result = ses_recv_diag(sdev, 10, buf, len); |
| 629 | if (result) |
| 630 | goto recv_failed; |
| 631 | ses_dev->page10 = buf; |
| 632 | ses_dev->page10_len = len; |
| 633 | buf = NULL; |
| 634 | } |
| 635 | scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL); |
| 636 | if (!scomp) |
| 637 | goto err_free; |
| 638 | |
| 639 | edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev), |
| 640 | components, &ses_enclosure_callbacks); |
| 641 | if (IS_ERR(edev)) { |
| 642 | err = PTR_ERR(edev); |
| 643 | goto err_free; |
| 644 | } |
| 645 | |
| 646 | kfree(hdr_buf); |
| 647 | |
| 648 | edev->scratch = ses_dev; |
| 649 | for (i = 0; i < components; i++) |
| 650 | edev->component[i].scratch = scomp + i; |
| 651 | |
| 652 | ses_enclosure_data_process(edev, sdev, 1); |
| 653 | |
| 654 | /* see if there are any devices matching before |
| 655 | * we found the enclosure */ |
| 656 | shost_for_each_device(tmp_sdev, sdev->host) { |
| 657 | if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev)) |
| 658 | continue; |
| 659 | ses_match_to_enclosure(edev, tmp_sdev); |
| 660 | } |
| 661 | |
| 662 | return 0; |
| 663 | |
| 664 | recv_failed: |
| 665 | sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n", |
| 666 | result); |
| 667 | err = -ENODEV; |
| 668 | err_free: |
| 669 | kfree(buf); |
| 670 | kfree(scomp); |
| 671 | kfree(ses_dev->page10); |
| 672 | kfree(ses_dev->page2); |
| 673 | kfree(ses_dev->page1); |
| 674 | err_init_free: |
| 675 | kfree(ses_dev); |
| 676 | kfree(hdr_buf); |
| 677 | sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err); |
| 678 | return err; |
| 679 | } |
| 680 | |
| 681 | static int ses_remove(struct device *dev) |
| 682 | { |
| 683 | return 0; |
| 684 | } |
| 685 | |
| 686 | static void ses_intf_remove_component(struct scsi_device *sdev) |
| 687 | { |
| 688 | struct enclosure_device *edev, *prev = NULL; |
| 689 | |
| 690 | while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) { |
| 691 | prev = edev; |
| 692 | if (!enclosure_remove_device(edev, &sdev->sdev_gendev)) |
| 693 | break; |
| 694 | } |
| 695 | if (edev) |
| 696 | put_device(&edev->edev); |
| 697 | } |
| 698 | |
| 699 | static void ses_intf_remove_enclosure(struct scsi_device *sdev) |
| 700 | { |
| 701 | struct enclosure_device *edev; |
| 702 | struct ses_device *ses_dev; |
| 703 | |
| 704 | /* exact match to this enclosure */ |
| 705 | edev = enclosure_find(&sdev->sdev_gendev, NULL); |
| 706 | if (!edev) |
| 707 | return; |
| 708 | |
| 709 | ses_dev = edev->scratch; |
| 710 | edev->scratch = NULL; |
| 711 | |
| 712 | kfree(ses_dev->page10); |
| 713 | kfree(ses_dev->page1); |
| 714 | kfree(ses_dev->page2); |
| 715 | kfree(ses_dev); |
| 716 | |
| 717 | kfree(edev->component[0].scratch); |
| 718 | |
| 719 | put_device(&edev->edev); |
| 720 | enclosure_unregister(edev); |
| 721 | } |
| 722 | |
| 723 | static void ses_intf_remove(struct device *cdev, |
| 724 | struct class_interface *intf) |
| 725 | { |
| 726 | struct scsi_device *sdev = to_scsi_device(cdev->parent); |
| 727 | |
| 728 | if (!scsi_device_enclosure(sdev)) |
| 729 | ses_intf_remove_component(sdev); |
| 730 | else |
| 731 | ses_intf_remove_enclosure(sdev); |
| 732 | } |
| 733 | |
| 734 | static struct class_interface ses_interface = { |
| 735 | .add_dev = ses_intf_add, |
| 736 | .remove_dev = ses_intf_remove, |
| 737 | }; |
| 738 | |
| 739 | static struct scsi_driver ses_template = { |
| 740 | .owner = THIS_MODULE, |
| 741 | .gendrv = { |
| 742 | .name = "ses", |
| 743 | .probe = ses_probe, |
| 744 | .remove = ses_remove, |
| 745 | }, |
| 746 | }; |
| 747 | |
| 748 | static int __init ses_init(void) |
| 749 | { |
| 750 | int err; |
| 751 | |
| 752 | err = scsi_register_interface(&ses_interface); |
| 753 | if (err) |
| 754 | return err; |
| 755 | |
| 756 | err = scsi_register_driver(&ses_template.gendrv); |
| 757 | if (err) |
| 758 | goto out_unreg; |
| 759 | |
| 760 | return 0; |
| 761 | |
| 762 | out_unreg: |
| 763 | scsi_unregister_interface(&ses_interface); |
| 764 | return err; |
| 765 | } |
| 766 | |
| 767 | static void __exit ses_exit(void) |
| 768 | { |
| 769 | scsi_unregister_driver(&ses_template.gendrv); |
| 770 | scsi_unregister_interface(&ses_interface); |
| 771 | } |
| 772 | |
| 773 | module_init(ses_init); |
| 774 | module_exit(ses_exit); |
| 775 | |
| 776 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE); |
| 777 | |
| 778 | MODULE_AUTHOR("James Bottomley"); |
| 779 | MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver"); |
| 780 | MODULE_LICENSE("GPL v2"); |