1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Tejun Heo <tj@kernel.org> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <linux/export.h> 41 #include <scsi/scsi.h> 42 #include <scsi/scsi_host.h> 43 #include <scsi/scsi_cmnd.h> 44 #include <scsi/scsi_eh.h> 45 #include <scsi/scsi_device.h> 46 #include <scsi/scsi_tcq.h> 47 #include <scsi/scsi_transport.h> 48 #include <linux/libata.h> 49 #include <linux/hdreg.h> 50 #include <linux/uaccess.h> 51 #include <linux/suspend.h> 52 #include <asm/unaligned.h> 53 54 #include "libata.h" 55 #include "libata-transport.h" 56 57 #define ATA_SCSI_RBUF_SIZE 4096 58 59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 61 62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 63 64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 67 const struct scsi_device *scsidev); 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 static const char *ata_lpm_policy_names[] = { 108 [ATA_LPM_UNKNOWN] = "max_performance", 109 [ATA_LPM_MAX_POWER] = "max_performance", 110 [ATA_LPM_MED_POWER] = "medium_power", 111 [ATA_LPM_MIN_POWER] = "min_power", 112 }; 113 114 static ssize_t ata_scsi_lpm_store(struct device *device, 115 struct device_attribute *attr, 116 const char *buf, size_t count) 117 { 118 struct Scsi_Host *shost = class_to_shost(device); 119 struct ata_port *ap = ata_shost_to_port(shost); 120 struct ata_link *link; 121 struct ata_device *dev; 122 enum ata_lpm_policy policy; 123 unsigned long flags; 124 125 /* UNKNOWN is internal state, iterate from MAX_POWER */ 126 for (policy = ATA_LPM_MAX_POWER; 127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 128 const char *name = ata_lpm_policy_names[policy]; 129 130 if (strncmp(name, buf, strlen(name)) == 0) 131 break; 132 } 133 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 134 return -EINVAL; 135 136 spin_lock_irqsave(ap->lock, flags); 137 138 ata_for_each_link(link, ap, EDGE) { 139 ata_for_each_dev(dev, &ap->link, ENABLED) { 140 if (dev->horkage & ATA_HORKAGE_NOLPM) { 141 count = -EOPNOTSUPP; 142 goto out_unlock; 143 } 144 } 145 } 146 147 ap->target_lpm_policy = policy; 148 ata_port_schedule_eh(ap); 149 out_unlock: 150 spin_unlock_irqrestore(ap->lock, flags); 151 return count; 152 } 153 154 static ssize_t ata_scsi_lpm_show(struct device *dev, 155 struct device_attribute *attr, char *buf) 156 { 157 struct Scsi_Host *shost = class_to_shost(dev); 158 struct ata_port *ap = ata_shost_to_port(shost); 159 160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 161 return -EINVAL; 162 163 return snprintf(buf, PAGE_SIZE, "%s\n", 164 ata_lpm_policy_names[ap->target_lpm_policy]); 165 } 166 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 167 ata_scsi_lpm_show, ata_scsi_lpm_store); 168 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 169 170 static ssize_t ata_scsi_park_show(struct device *device, 171 struct device_attribute *attr, char *buf) 172 { 173 struct scsi_device *sdev = to_scsi_device(device); 174 struct ata_port *ap; 175 struct ata_link *link; 176 struct ata_device *dev; 177 unsigned long flags, now; 178 unsigned int uninitialized_var(msecs); 179 int rc = 0; 180 181 ap = ata_shost_to_port(sdev->host); 182 183 spin_lock_irqsave(ap->lock, flags); 184 dev = ata_scsi_find_dev(ap, sdev); 185 if (!dev) { 186 rc = -ENODEV; 187 goto unlock; 188 } 189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 190 rc = -EOPNOTSUPP; 191 goto unlock; 192 } 193 194 link = dev->link; 195 now = jiffies; 196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 197 link->eh_context.unloaded_mask & (1 << dev->devno) && 198 time_after(dev->unpark_deadline, now)) 199 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 200 else 201 msecs = 0; 202 203 unlock: 204 spin_unlock_irq(ap->lock); 205 206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 207 } 208 209 static ssize_t ata_scsi_park_store(struct device *device, 210 struct device_attribute *attr, 211 const char *buf, size_t len) 212 { 213 struct scsi_device *sdev = to_scsi_device(device); 214 struct ata_port *ap; 215 struct ata_device *dev; 216 long int input; 217 unsigned long flags; 218 int rc; 219 220 rc = kstrtol(buf, 10, &input); 221 if (rc) 222 return rc; 223 if (input < -2) 224 return -EINVAL; 225 if (input > ATA_TMOUT_MAX_PARK) { 226 rc = -EOVERFLOW; 227 input = ATA_TMOUT_MAX_PARK; 228 } 229 230 ap = ata_shost_to_port(sdev->host); 231 232 spin_lock_irqsave(ap->lock, flags); 233 dev = ata_scsi_find_dev(ap, sdev); 234 if (unlikely(!dev)) { 235 rc = -ENODEV; 236 goto unlock; 237 } 238 if (dev->class != ATA_DEV_ATA) { 239 rc = -EOPNOTSUPP; 240 goto unlock; 241 } 242 243 if (input >= 0) { 244 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 245 rc = -EOPNOTSUPP; 246 goto unlock; 247 } 248 249 dev->unpark_deadline = ata_deadline(jiffies, input); 250 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 251 ata_port_schedule_eh(ap); 252 complete(&ap->park_req_pending); 253 } else { 254 switch (input) { 255 case -1: 256 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 257 break; 258 case -2: 259 dev->flags |= ATA_DFLAG_NO_UNLOAD; 260 break; 261 } 262 } 263 unlock: 264 spin_unlock_irqrestore(ap->lock, flags); 265 266 return rc ? rc : len; 267 } 268 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 269 ata_scsi_park_show, ata_scsi_park_store); 270 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 271 272 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 273 { 274 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 275 276 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 277 } 278 279 static ssize_t 280 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 281 const char *buf, size_t count) 282 { 283 struct Scsi_Host *shost = class_to_shost(dev); 284 struct ata_port *ap = ata_shost_to_port(shost); 285 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 286 return ap->ops->em_store(ap, buf, count); 287 return -EINVAL; 288 } 289 290 static ssize_t 291 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 292 char *buf) 293 { 294 struct Scsi_Host *shost = class_to_shost(dev); 295 struct ata_port *ap = ata_shost_to_port(shost); 296 297 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 298 return ap->ops->em_show(ap, buf); 299 return -EINVAL; 300 } 301 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 302 ata_scsi_em_message_show, ata_scsi_em_message_store); 303 EXPORT_SYMBOL_GPL(dev_attr_em_message); 304 305 static ssize_t 306 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 307 char *buf) 308 { 309 struct Scsi_Host *shost = class_to_shost(dev); 310 struct ata_port *ap = ata_shost_to_port(shost); 311 312 return snprintf(buf, 23, "%d\n", ap->em_message_type); 313 } 314 DEVICE_ATTR(em_message_type, S_IRUGO, 315 ata_scsi_em_message_type_show, NULL); 316 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 317 318 static ssize_t 319 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 320 char *buf) 321 { 322 struct scsi_device *sdev = to_scsi_device(dev); 323 struct ata_port *ap = ata_shost_to_port(sdev->host); 324 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 325 326 if (atadev && ap->ops->sw_activity_show && 327 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 328 return ap->ops->sw_activity_show(atadev, buf); 329 return -EINVAL; 330 } 331 332 static ssize_t 333 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 334 const char *buf, size_t count) 335 { 336 struct scsi_device *sdev = to_scsi_device(dev); 337 struct ata_port *ap = ata_shost_to_port(sdev->host); 338 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 339 enum sw_activity val; 340 int rc; 341 342 if (atadev && ap->ops->sw_activity_store && 343 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 344 val = simple_strtoul(buf, NULL, 0); 345 switch (val) { 346 case OFF: case BLINK_ON: case BLINK_OFF: 347 rc = ap->ops->sw_activity_store(atadev, val); 348 if (!rc) 349 return count; 350 else 351 return rc; 352 } 353 } 354 return -EINVAL; 355 } 356 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 357 ata_scsi_activity_store); 358 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 359 360 struct device_attribute *ata_common_sdev_attrs[] = { 361 &dev_attr_unload_heads, 362 NULL 363 }; 364 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 365 366 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 367 { 368 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 369 /* "Invalid field in cbd" */ 370 cmd->scsi_done(cmd); 371 } 372 373 /** 374 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 375 * @sdev: SCSI device for which BIOS geometry is to be determined 376 * @bdev: block device associated with @sdev 377 * @capacity: capacity of SCSI device 378 * @geom: location to which geometry will be output 379 * 380 * Generic bios head/sector/cylinder calculator 381 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 382 * mapping. Some situations may arise where the disk is not 383 * bootable if this is not used. 384 * 385 * LOCKING: 386 * Defined by the SCSI layer. We don't really care. 387 * 388 * RETURNS: 389 * Zero. 390 */ 391 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 392 sector_t capacity, int geom[]) 393 { 394 geom[0] = 255; 395 geom[1] = 63; 396 sector_div(capacity, 255*63); 397 geom[2] = capacity; 398 399 return 0; 400 } 401 402 /** 403 * ata_scsi_unlock_native_capacity - unlock native capacity 404 * @sdev: SCSI device to adjust device capacity for 405 * 406 * This function is called if a partition on @sdev extends beyond 407 * the end of the device. It requests EH to unlock HPA. 408 * 409 * LOCKING: 410 * Defined by the SCSI layer. Might sleep. 411 */ 412 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 413 { 414 struct ata_port *ap = ata_shost_to_port(sdev->host); 415 struct ata_device *dev; 416 unsigned long flags; 417 418 spin_lock_irqsave(ap->lock, flags); 419 420 dev = ata_scsi_find_dev(ap, sdev); 421 if (dev && dev->n_sectors < dev->n_native_sectors) { 422 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 423 dev->link->eh_info.action |= ATA_EH_RESET; 424 ata_port_schedule_eh(ap); 425 } 426 427 spin_unlock_irqrestore(ap->lock, flags); 428 ata_port_wait_eh(ap); 429 } 430 431 /** 432 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 433 * @ap: target port 434 * @sdev: SCSI device to get identify data for 435 * @arg: User buffer area for identify data 436 * 437 * LOCKING: 438 * Defined by the SCSI layer. We don't really care. 439 * 440 * RETURNS: 441 * Zero on success, negative errno on error. 442 */ 443 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 444 void __user *arg) 445 { 446 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 447 u16 __user *dst = arg; 448 char buf[40]; 449 450 if (!dev) 451 return -ENOMSG; 452 453 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 454 return -EFAULT; 455 456 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 457 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 458 return -EFAULT; 459 460 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 461 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 462 return -EFAULT; 463 464 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 465 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 466 return -EFAULT; 467 468 return 0; 469 } 470 471 /** 472 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 473 * @scsidev: Device to which we are issuing command 474 * @arg: User provided data for issuing command 475 * 476 * LOCKING: 477 * Defined by the SCSI layer. We don't really care. 478 * 479 * RETURNS: 480 * Zero on success, negative errno on error. 481 */ 482 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 483 { 484 int rc = 0; 485 u8 scsi_cmd[MAX_COMMAND_SIZE]; 486 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 487 int argsize = 0; 488 enum dma_data_direction data_dir; 489 int cmd_result; 490 491 if (arg == NULL) 492 return -EINVAL; 493 494 if (copy_from_user(args, arg, sizeof(args))) 495 return -EFAULT; 496 497 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 498 if (!sensebuf) 499 return -ENOMEM; 500 501 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 502 503 if (args[3]) { 504 argsize = ATA_SECT_SIZE * args[3]; 505 argbuf = kmalloc(argsize, GFP_KERNEL); 506 if (argbuf == NULL) { 507 rc = -ENOMEM; 508 goto error; 509 } 510 511 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 512 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 513 block count in sector count field */ 514 data_dir = DMA_FROM_DEVICE; 515 } else { 516 scsi_cmd[1] = (3 << 1); /* Non-data */ 517 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 518 data_dir = DMA_NONE; 519 } 520 521 scsi_cmd[0] = ATA_16; 522 523 scsi_cmd[4] = args[2]; 524 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 525 scsi_cmd[6] = args[3]; 526 scsi_cmd[8] = args[1]; 527 scsi_cmd[10] = 0x4f; 528 scsi_cmd[12] = 0xc2; 529 } else { 530 scsi_cmd[6] = args[1]; 531 } 532 scsi_cmd[14] = args[0]; 533 534 /* Good values for timeout and retries? Values below 535 from scsi_ioctl_send_command() for default case... */ 536 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 537 sensebuf, (10*HZ), 5, 0, NULL); 538 539 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 540 u8 *desc = sensebuf + 8; 541 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 542 543 /* If we set cc then ATA pass-through will cause a 544 * check condition even if no error. Filter that. */ 545 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 546 struct scsi_sense_hdr sshdr; 547 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 548 &sshdr); 549 if (sshdr.sense_key == RECOVERED_ERROR && 550 sshdr.asc == 0 && sshdr.ascq == 0x1d) 551 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 552 } 553 554 /* Send userspace a few ATA registers (same as drivers/ide) */ 555 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 556 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 557 args[0] = desc[13]; /* status */ 558 args[1] = desc[3]; /* error */ 559 args[2] = desc[5]; /* sector count (0:7) */ 560 if (copy_to_user(arg, args, sizeof(args))) 561 rc = -EFAULT; 562 } 563 } 564 565 566 if (cmd_result) { 567 rc = -EIO; 568 goto error; 569 } 570 571 if ((argbuf) 572 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 573 rc = -EFAULT; 574 error: 575 kfree(sensebuf); 576 kfree(argbuf); 577 return rc; 578 } 579 580 /** 581 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 582 * @scsidev: Device to which we are issuing command 583 * @arg: User provided data for issuing command 584 * 585 * LOCKING: 586 * Defined by the SCSI layer. We don't really care. 587 * 588 * RETURNS: 589 * Zero on success, negative errno on error. 590 */ 591 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 592 { 593 int rc = 0; 594 u8 scsi_cmd[MAX_COMMAND_SIZE]; 595 u8 args[7], *sensebuf = NULL; 596 int cmd_result; 597 598 if (arg == NULL) 599 return -EINVAL; 600 601 if (copy_from_user(args, arg, sizeof(args))) 602 return -EFAULT; 603 604 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 605 if (!sensebuf) 606 return -ENOMEM; 607 608 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 609 scsi_cmd[0] = ATA_16; 610 scsi_cmd[1] = (3 << 1); /* Non-data */ 611 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 612 scsi_cmd[4] = args[1]; 613 scsi_cmd[6] = args[2]; 614 scsi_cmd[8] = args[3]; 615 scsi_cmd[10] = args[4]; 616 scsi_cmd[12] = args[5]; 617 scsi_cmd[13] = args[6] & 0x4f; 618 scsi_cmd[14] = args[0]; 619 620 /* Good values for timeout and retries? Values below 621 from scsi_ioctl_send_command() for default case... */ 622 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 623 sensebuf, (10*HZ), 5, 0, NULL); 624 625 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 626 u8 *desc = sensebuf + 8; 627 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 628 629 /* If we set cc then ATA pass-through will cause a 630 * check condition even if no error. Filter that. */ 631 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 632 struct scsi_sense_hdr sshdr; 633 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 634 &sshdr); 635 if (sshdr.sense_key == RECOVERED_ERROR && 636 sshdr.asc == 0 && sshdr.ascq == 0x1d) 637 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 638 } 639 640 /* Send userspace ATA registers */ 641 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 642 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 643 args[0] = desc[13]; /* status */ 644 args[1] = desc[3]; /* error */ 645 args[2] = desc[5]; /* sector count (0:7) */ 646 args[3] = desc[7]; /* lbal */ 647 args[4] = desc[9]; /* lbam */ 648 args[5] = desc[11]; /* lbah */ 649 args[6] = desc[12]; /* select */ 650 if (copy_to_user(arg, args, sizeof(args))) 651 rc = -EFAULT; 652 } 653 } 654 655 if (cmd_result) { 656 rc = -EIO; 657 goto error; 658 } 659 660 error: 661 kfree(sensebuf); 662 return rc; 663 } 664 665 static int ata_ioc32(struct ata_port *ap) 666 { 667 if (ap->flags & ATA_FLAG_PIO_DMA) 668 return 1; 669 if (ap->pflags & ATA_PFLAG_PIO32) 670 return 1; 671 return 0; 672 } 673 674 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 675 int cmd, void __user *arg) 676 { 677 int val = -EINVAL, rc = -EINVAL; 678 unsigned long flags; 679 680 switch (cmd) { 681 case ATA_IOC_GET_IO32: 682 spin_lock_irqsave(ap->lock, flags); 683 val = ata_ioc32(ap); 684 spin_unlock_irqrestore(ap->lock, flags); 685 if (copy_to_user(arg, &val, 1)) 686 return -EFAULT; 687 return 0; 688 689 case ATA_IOC_SET_IO32: 690 val = (unsigned long) arg; 691 rc = 0; 692 spin_lock_irqsave(ap->lock, flags); 693 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 694 if (val) 695 ap->pflags |= ATA_PFLAG_PIO32; 696 else 697 ap->pflags &= ~ATA_PFLAG_PIO32; 698 } else { 699 if (val != ata_ioc32(ap)) 700 rc = -EINVAL; 701 } 702 spin_unlock_irqrestore(ap->lock, flags); 703 return rc; 704 705 case HDIO_GET_IDENTITY: 706 return ata_get_identity(ap, scsidev, arg); 707 708 case HDIO_DRIVE_CMD: 709 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 710 return -EACCES; 711 return ata_cmd_ioctl(scsidev, arg); 712 713 case HDIO_DRIVE_TASK: 714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 715 return -EACCES; 716 return ata_task_ioctl(scsidev, arg); 717 718 default: 719 rc = -ENOTTY; 720 break; 721 } 722 723 return rc; 724 } 725 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 726 727 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 728 { 729 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 730 scsidev, cmd, arg); 731 } 732 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 733 734 /** 735 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 736 * @dev: ATA device to which the new command is attached 737 * @cmd: SCSI command that originated this ATA command 738 * 739 * Obtain a reference to an unused ata_queued_cmd structure, 740 * which is the basic libata structure representing a single 741 * ATA command sent to the hardware. 742 * 743 * If a command was available, fill in the SCSI-specific 744 * portions of the structure with information on the 745 * current command. 746 * 747 * LOCKING: 748 * spin_lock_irqsave(host lock) 749 * 750 * RETURNS: 751 * Command allocated, or %NULL if none available. 752 */ 753 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 754 struct scsi_cmnd *cmd) 755 { 756 struct ata_queued_cmd *qc; 757 758 qc = ata_qc_new_init(dev); 759 if (qc) { 760 qc->scsicmd = cmd; 761 qc->scsidone = cmd->scsi_done; 762 763 qc->sg = scsi_sglist(cmd); 764 qc->n_elem = scsi_sg_count(cmd); 765 } else { 766 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 767 cmd->scsi_done(cmd); 768 } 769 770 return qc; 771 } 772 773 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 774 { 775 struct scsi_cmnd *scmd = qc->scsicmd; 776 777 qc->extrabytes = scmd->request->extra_len; 778 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 779 } 780 781 /** 782 * ata_dump_status - user friendly display of error info 783 * @id: id of the port in question 784 * @tf: ptr to filled out taskfile 785 * 786 * Decode and dump the ATA error/status registers for the user so 787 * that they have some idea what really happened at the non 788 * make-believe layer. 789 * 790 * LOCKING: 791 * inherited from caller 792 */ 793 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 794 { 795 u8 stat = tf->command, err = tf->feature; 796 797 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 798 if (stat & ATA_BUSY) { 799 printk("Busy }\n"); /* Data is not valid in this case */ 800 } else { 801 if (stat & 0x40) printk("DriveReady "); 802 if (stat & 0x20) printk("DeviceFault "); 803 if (stat & 0x10) printk("SeekComplete "); 804 if (stat & 0x08) printk("DataRequest "); 805 if (stat & 0x04) printk("CorrectedError "); 806 if (stat & 0x02) printk("Index "); 807 if (stat & 0x01) printk("Error "); 808 printk("}\n"); 809 810 if (err) { 811 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 812 if (err & 0x04) printk("DriveStatusError "); 813 if (err & 0x80) { 814 if (err & 0x04) printk("BadCRC "); 815 else printk("Sector "); 816 } 817 if (err & 0x40) printk("UncorrectableError "); 818 if (err & 0x10) printk("SectorIdNotFound "); 819 if (err & 0x02) printk("TrackZeroNotFound "); 820 if (err & 0x01) printk("AddrMarkNotFound "); 821 printk("}\n"); 822 } 823 } 824 } 825 826 /** 827 * ata_to_sense_error - convert ATA error to SCSI error 828 * @id: ATA device number 829 * @drv_stat: value contained in ATA status register 830 * @drv_err: value contained in ATA error register 831 * @sk: the sense key we'll fill out 832 * @asc: the additional sense code we'll fill out 833 * @ascq: the additional sense code qualifier we'll fill out 834 * @verbose: be verbose 835 * 836 * Converts an ATA error into a SCSI error. Fill out pointers to 837 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 838 * format sense blocks. 839 * 840 * LOCKING: 841 * spin_lock_irqsave(host lock) 842 */ 843 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 844 u8 *asc, u8 *ascq, int verbose) 845 { 846 int i; 847 848 /* Based on the 3ware driver translation table */ 849 static const unsigned char sense_table[][4] = { 850 /* BBD|ECC|ID|MAR */ 851 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 852 /* BBD|ECC|ID */ 853 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 854 /* ECC|MC|MARK */ 855 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 856 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 857 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 858 /* MC|ID|ABRT|TRK0|MARK */ 859 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 860 /* MCR|MARK */ 861 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 862 /* Bad address mark */ 863 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 864 /* TRK0 */ 865 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 866 /* Abort: 0x04 is not translated here, see below */ 867 /* Media change request */ 868 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 869 /* SRV/IDNF */ 870 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, // ID not found Logical address out of range 871 /* MC */ 872 {0x20, UNIT_ATTENTION, 0x28, 0x00}, // Media Changed Not ready to ready change, medium may have changed 873 /* ECC */ 874 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 875 /* BBD - block marked bad */ 876 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 877 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 878 }; 879 static const unsigned char stat_table[][4] = { 880 /* Must be first because BUSY means no other bits valid */ 881 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 882 {0x20, HARDWARE_ERROR, 0x44, 0x00}, // Device fault, internal target failure 883 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 884 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 885 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 886 }; 887 888 /* 889 * Is this an error we can process/parse 890 */ 891 if (drv_stat & ATA_BUSY) { 892 drv_err = 0; /* Ignore the err bits, they're invalid */ 893 } 894 895 if (drv_err) { 896 /* Look for drv_err */ 897 for (i = 0; sense_table[i][0] != 0xFF; i++) { 898 /* Look for best matches first */ 899 if ((sense_table[i][0] & drv_err) == 900 sense_table[i][0]) { 901 *sk = sense_table[i][1]; 902 *asc = sense_table[i][2]; 903 *ascq = sense_table[i][3]; 904 goto translate_done; 905 } 906 } 907 } 908 909 /* 910 * Fall back to interpreting status bits. Note that if the drv_err 911 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 912 * is not descriptive enough. 913 */ 914 for (i = 0; stat_table[i][0] != 0xFF; i++) { 915 if (stat_table[i][0] & drv_stat) { 916 *sk = stat_table[i][1]; 917 *asc = stat_table[i][2]; 918 *ascq = stat_table[i][3]; 919 goto translate_done; 920 } 921 } 922 923 /* 924 * We need a sensible error return here, which is tricky, and one 925 * that won't cause people to do things like return a disk wrongly. 926 */ 927 *sk = ABORTED_COMMAND; 928 *asc = 0x00; 929 *ascq = 0x00; 930 931 translate_done: 932 if (verbose) 933 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 934 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 935 id, drv_stat, drv_err, *sk, *asc, *ascq); 936 return; 937 } 938 939 /* 940 * ata_gen_passthru_sense - Generate check condition sense block. 941 * @qc: Command that completed. 942 * 943 * This function is specific to the ATA descriptor format sense 944 * block specified for the ATA pass through commands. Regardless 945 * of whether the command errored or not, return a sense 946 * block. Copy all controller registers into the sense 947 * block. If there was no error, we get the request from an ATA 948 * passthrough command, so we use the following sense data: 949 * sk = RECOVERED ERROR 950 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 951 * 952 * 953 * LOCKING: 954 * None. 955 */ 956 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 957 { 958 struct scsi_cmnd *cmd = qc->scsicmd; 959 struct ata_taskfile *tf = &qc->result_tf; 960 unsigned char *sb = cmd->sense_buffer; 961 unsigned char *desc = sb + 8; 962 int verbose = qc->ap->ops->error_handler == NULL; 963 964 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 965 966 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 967 968 /* 969 * Use ata_to_sense_error() to map status register bits 970 * onto sense key, asc & ascq. 971 */ 972 if (qc->err_mask || 973 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 974 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 975 &sb[1], &sb[2], &sb[3], verbose); 976 sb[1] &= 0x0f; 977 } else { 978 sb[1] = RECOVERED_ERROR; 979 sb[2] = 0; 980 sb[3] = 0x1D; 981 } 982 983 /* 984 * Sense data is current and format is descriptor. 985 */ 986 sb[0] = 0x72; 987 988 desc[0] = 0x09; 989 990 /* set length of additional sense data */ 991 sb[7] = 14; 992 desc[1] = 12; 993 994 /* 995 * Copy registers into sense buffer. 996 */ 997 desc[2] = 0x00; 998 desc[3] = tf->feature; /* == error reg */ 999 desc[5] = tf->nsect; 1000 desc[7] = tf->lbal; 1001 desc[9] = tf->lbam; 1002 desc[11] = tf->lbah; 1003 desc[12] = tf->device; 1004 desc[13] = tf->command; /* == status reg */ 1005 1006 /* 1007 * Fill in Extend bit, and the high order bytes 1008 * if applicable. 1009 */ 1010 if (tf->flags & ATA_TFLAG_LBA48) { 1011 desc[2] |= 0x01; 1012 desc[4] = tf->hob_nsect; 1013 desc[6] = tf->hob_lbal; 1014 desc[8] = tf->hob_lbam; 1015 desc[10] = tf->hob_lbah; 1016 } 1017 } 1018 1019 /** 1020 * ata_gen_ata_sense - generate a SCSI fixed sense block 1021 * @qc: Command that we are erroring out 1022 * 1023 * Generate sense block for a failed ATA command @qc. Descriptor 1024 * format is used to accommodate LBA48 block address. 1025 * 1026 * LOCKING: 1027 * None. 1028 */ 1029 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1030 { 1031 struct ata_device *dev = qc->dev; 1032 struct scsi_cmnd *cmd = qc->scsicmd; 1033 struct ata_taskfile *tf = &qc->result_tf; 1034 unsigned char *sb = cmd->sense_buffer; 1035 unsigned char *desc = sb + 8; 1036 int verbose = qc->ap->ops->error_handler == NULL; 1037 u64 block; 1038 1039 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1040 1041 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1042 1043 /* sense data is current and format is descriptor */ 1044 sb[0] = 0x72; 1045 1046 /* Use ata_to_sense_error() to map status register bits 1047 * onto sense key, asc & ascq. 1048 */ 1049 if (qc->err_mask || 1050 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1051 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1052 &sb[1], &sb[2], &sb[3], verbose); 1053 sb[1] &= 0x0f; 1054 } 1055 1056 block = ata_tf_read_block(&qc->result_tf, dev); 1057 1058 /* information sense data descriptor */ 1059 sb[7] = 12; 1060 desc[0] = 0x00; 1061 desc[1] = 10; 1062 1063 desc[2] |= 0x80; /* valid */ 1064 desc[6] = block >> 40; 1065 desc[7] = block >> 32; 1066 desc[8] = block >> 24; 1067 desc[9] = block >> 16; 1068 desc[10] = block >> 8; 1069 desc[11] = block; 1070 } 1071 1072 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1073 { 1074 sdev->use_10_for_rw = 1; 1075 sdev->use_10_for_ms = 1; 1076 sdev->no_report_opcodes = 1; 1077 sdev->no_write_same = 1; 1078 1079 /* Schedule policy is determined by ->qc_defer() callback and 1080 * it needs to see every deferred qc. Set dev_blocked to 1 to 1081 * prevent SCSI midlayer from automatically deferring 1082 * requests. 1083 */ 1084 sdev->max_device_blocked = 1; 1085 } 1086 1087 /** 1088 * atapi_drain_needed - Check whether data transfer may overflow 1089 * @rq: request to be checked 1090 * 1091 * ATAPI commands which transfer variable length data to host 1092 * might overflow due to application error or hardare bug. This 1093 * function checks whether overflow should be drained and ignored 1094 * for @request. 1095 * 1096 * LOCKING: 1097 * None. 1098 * 1099 * RETURNS: 1100 * 1 if ; otherwise, 0. 1101 */ 1102 static int atapi_drain_needed(struct request *rq) 1103 { 1104 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1105 return 0; 1106 1107 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1108 return 0; 1109 1110 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1111 } 1112 1113 static int ata_scsi_dev_config(struct scsi_device *sdev, 1114 struct ata_device *dev) 1115 { 1116 struct request_queue *q = sdev->request_queue; 1117 1118 if (!ata_id_has_unload(dev->id)) 1119 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1120 1121 /* configure max sectors */ 1122 blk_queue_max_hw_sectors(q, dev->max_sectors); 1123 1124 if (dev->class == ATA_DEV_ATAPI) { 1125 void *buf; 1126 1127 sdev->sector_size = ATA_SECT_SIZE; 1128 1129 /* set DMA padding */ 1130 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1131 1132 /* configure draining */ 1133 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1134 if (!buf) { 1135 ata_dev_err(dev, "drain buffer allocation failed\n"); 1136 return -ENOMEM; 1137 } 1138 1139 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1140 } else { 1141 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1142 sdev->manage_start_stop = 1; 1143 } 1144 1145 /* 1146 * ata_pio_sectors() expects buffer for each sector to not cross 1147 * page boundary. Enforce it by requiring buffers to be sector 1148 * aligned, which works iff sector_size is not larger than 1149 * PAGE_SIZE. ATAPI devices also need the alignment as 1150 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1151 */ 1152 if (sdev->sector_size > PAGE_SIZE) 1153 ata_dev_warn(dev, 1154 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1155 sdev->sector_size); 1156 1157 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1158 1159 if (dev->flags & ATA_DFLAG_AN) 1160 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1161 1162 if (dev->flags & ATA_DFLAG_NCQ) { 1163 int depth; 1164 1165 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1166 depth = min(ATA_MAX_QUEUE - 1, depth); 1167 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1168 } 1169 1170 blk_queue_flush_queueable(q, false); 1171 1172 dev->sdev = sdev; 1173 return 0; 1174 } 1175 1176 /** 1177 * ata_scsi_slave_config - Set SCSI device attributes 1178 * @sdev: SCSI device to examine 1179 * 1180 * This is called before we actually start reading 1181 * and writing to the device, to configure certain 1182 * SCSI mid-layer behaviors. 1183 * 1184 * LOCKING: 1185 * Defined by SCSI layer. We don't really care. 1186 */ 1187 1188 int ata_scsi_slave_config(struct scsi_device *sdev) 1189 { 1190 struct ata_port *ap = ata_shost_to_port(sdev->host); 1191 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1192 int rc = 0; 1193 1194 ata_scsi_sdev_config(sdev); 1195 1196 if (dev) 1197 rc = ata_scsi_dev_config(sdev, dev); 1198 1199 return rc; 1200 } 1201 1202 /** 1203 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1204 * @sdev: SCSI device to be destroyed 1205 * 1206 * @sdev is about to be destroyed for hot/warm unplugging. If 1207 * this unplugging was initiated by libata as indicated by NULL 1208 * dev->sdev, this function doesn't have to do anything. 1209 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1210 * Clear dev->sdev, schedule the device for ATA detach and invoke 1211 * EH. 1212 * 1213 * LOCKING: 1214 * Defined by SCSI layer. We don't really care. 1215 */ 1216 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1217 { 1218 struct ata_port *ap = ata_shost_to_port(sdev->host); 1219 struct request_queue *q = sdev->request_queue; 1220 unsigned long flags; 1221 struct ata_device *dev; 1222 1223 if (!ap->ops->error_handler) 1224 return; 1225 1226 spin_lock_irqsave(ap->lock, flags); 1227 dev = __ata_scsi_find_dev(ap, sdev); 1228 if (dev && dev->sdev) { 1229 /* SCSI device already in CANCEL state, no need to offline it */ 1230 dev->sdev = NULL; 1231 dev->flags |= ATA_DFLAG_DETACH; 1232 ata_port_schedule_eh(ap); 1233 } 1234 spin_unlock_irqrestore(ap->lock, flags); 1235 1236 kfree(q->dma_drain_buffer); 1237 q->dma_drain_buffer = NULL; 1238 q->dma_drain_size = 0; 1239 } 1240 1241 /** 1242 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1243 * @ap: ATA port to which the device change the queue depth 1244 * @sdev: SCSI device to configure queue depth for 1245 * @queue_depth: new queue depth 1246 * @reason: calling context 1247 * 1248 * libsas and libata have different approaches for associating a sdev to 1249 * its ata_port. 1250 * 1251 */ 1252 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1253 int queue_depth, int reason) 1254 { 1255 struct ata_device *dev; 1256 unsigned long flags; 1257 1258 if (reason != SCSI_QDEPTH_DEFAULT) 1259 return -EOPNOTSUPP; 1260 1261 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1262 return sdev->queue_depth; 1263 1264 dev = ata_scsi_find_dev(ap, sdev); 1265 if (!dev || !ata_dev_enabled(dev)) 1266 return sdev->queue_depth; 1267 1268 /* NCQ enabled? */ 1269 spin_lock_irqsave(ap->lock, flags); 1270 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1271 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1272 dev->flags |= ATA_DFLAG_NCQ_OFF; 1273 queue_depth = 1; 1274 } 1275 spin_unlock_irqrestore(ap->lock, flags); 1276 1277 /* limit and apply queue depth */ 1278 queue_depth = min(queue_depth, sdev->host->can_queue); 1279 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1280 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1281 1282 if (sdev->queue_depth == queue_depth) 1283 return -EINVAL; 1284 1285 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1286 return queue_depth; 1287 } 1288 1289 /** 1290 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1291 * @sdev: SCSI device to configure queue depth for 1292 * @queue_depth: new queue depth 1293 * @reason: calling context 1294 * 1295 * This is libata standard hostt->change_queue_depth callback. 1296 * SCSI will call into this callback when user tries to set queue 1297 * depth via sysfs. 1298 * 1299 * LOCKING: 1300 * SCSI layer (we don't care) 1301 * 1302 * RETURNS: 1303 * Newly configured queue depth. 1304 */ 1305 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1306 int reason) 1307 { 1308 struct ata_port *ap = ata_shost_to_port(sdev->host); 1309 1310 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1311 } 1312 1313 /** 1314 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1315 * @qc: Storage for translated ATA taskfile 1316 * 1317 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1318 * (to start). Perhaps these commands should be preceded by 1319 * CHECK POWER MODE to see what power mode the device is already in. 1320 * [See SAT revision 5 at www.t10.org] 1321 * 1322 * LOCKING: 1323 * spin_lock_irqsave(host lock) 1324 * 1325 * RETURNS: 1326 * Zero on success, non-zero on error. 1327 */ 1328 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1329 { 1330 struct scsi_cmnd *scmd = qc->scsicmd; 1331 struct ata_taskfile *tf = &qc->tf; 1332 const u8 *cdb = scmd->cmnd; 1333 1334 if (scmd->cmd_len < 5) 1335 goto invalid_fld; 1336 1337 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1338 tf->protocol = ATA_PROT_NODATA; 1339 if (cdb[1] & 0x1) { 1340 ; /* ignore IMMED bit, violates sat-r05 */ 1341 } 1342 if (cdb[4] & 0x2) 1343 goto invalid_fld; /* LOEJ bit set not supported */ 1344 if (((cdb[4] >> 4) & 0xf) != 0) 1345 goto invalid_fld; /* power conditions not supported */ 1346 1347 if (cdb[4] & 0x1) { 1348 tf->nsect = 1; /* 1 sector, lba=0 */ 1349 1350 if (qc->dev->flags & ATA_DFLAG_LBA) { 1351 tf->flags |= ATA_TFLAG_LBA; 1352 1353 tf->lbah = 0x0; 1354 tf->lbam = 0x0; 1355 tf->lbal = 0x0; 1356 tf->device |= ATA_LBA; 1357 } else { 1358 /* CHS */ 1359 tf->lbal = 0x1; /* sect */ 1360 tf->lbam = 0x0; /* cyl low */ 1361 tf->lbah = 0x0; /* cyl high */ 1362 } 1363 1364 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1365 } else { 1366 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1367 * or S5) causing some drives to spin up and down again. 1368 */ 1369 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1370 system_state == SYSTEM_POWER_OFF) 1371 goto skip; 1372 1373 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1374 system_entering_hibernation()) 1375 goto skip; 1376 1377 /* Issue ATA STANDBY IMMEDIATE command */ 1378 tf->command = ATA_CMD_STANDBYNOW1; 1379 } 1380 1381 /* 1382 * Standby and Idle condition timers could be implemented but that 1383 * would require libata to implement the Power condition mode page 1384 * and allow the user to change it. Changing mode pages requires 1385 * MODE SELECT to be implemented. 1386 */ 1387 1388 return 0; 1389 1390 invalid_fld: 1391 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1392 /* "Invalid field in cbd" */ 1393 return 1; 1394 skip: 1395 scmd->result = SAM_STAT_GOOD; 1396 return 1; 1397 } 1398 1399 1400 /** 1401 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1402 * @qc: Storage for translated ATA taskfile 1403 * 1404 * Sets up an ATA taskfile to issue FLUSH CACHE or 1405 * FLUSH CACHE EXT. 1406 * 1407 * LOCKING: 1408 * spin_lock_irqsave(host lock) 1409 * 1410 * RETURNS: 1411 * Zero on success, non-zero on error. 1412 */ 1413 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1414 { 1415 struct ata_taskfile *tf = &qc->tf; 1416 1417 tf->flags |= ATA_TFLAG_DEVICE; 1418 tf->protocol = ATA_PROT_NODATA; 1419 1420 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1421 tf->command = ATA_CMD_FLUSH_EXT; 1422 else 1423 tf->command = ATA_CMD_FLUSH; 1424 1425 /* flush is critical for IO integrity, consider it an IO command */ 1426 qc->flags |= ATA_QCFLAG_IO; 1427 1428 return 0; 1429 } 1430 1431 /** 1432 * scsi_6_lba_len - Get LBA and transfer length 1433 * @cdb: SCSI command to translate 1434 * 1435 * Calculate LBA and transfer length for 6-byte commands. 1436 * 1437 * RETURNS: 1438 * @plba: the LBA 1439 * @plen: the transfer length 1440 */ 1441 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1442 { 1443 u64 lba = 0; 1444 u32 len; 1445 1446 VPRINTK("six-byte command\n"); 1447 1448 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1449 lba |= ((u64)cdb[2]) << 8; 1450 lba |= ((u64)cdb[3]); 1451 1452 len = cdb[4]; 1453 1454 *plba = lba; 1455 *plen = len; 1456 } 1457 1458 /** 1459 * scsi_10_lba_len - Get LBA and transfer length 1460 * @cdb: SCSI command to translate 1461 * 1462 * Calculate LBA and transfer length for 10-byte commands. 1463 * 1464 * RETURNS: 1465 * @plba: the LBA 1466 * @plen: the transfer length 1467 */ 1468 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1469 { 1470 u64 lba = 0; 1471 u32 len = 0; 1472 1473 VPRINTK("ten-byte command\n"); 1474 1475 lba |= ((u64)cdb[2]) << 24; 1476 lba |= ((u64)cdb[3]) << 16; 1477 lba |= ((u64)cdb[4]) << 8; 1478 lba |= ((u64)cdb[5]); 1479 1480 len |= ((u32)cdb[7]) << 8; 1481 len |= ((u32)cdb[8]); 1482 1483 *plba = lba; 1484 *plen = len; 1485 } 1486 1487 /** 1488 * scsi_16_lba_len - Get LBA and transfer length 1489 * @cdb: SCSI command to translate 1490 * 1491 * Calculate LBA and transfer length for 16-byte commands. 1492 * 1493 * RETURNS: 1494 * @plba: the LBA 1495 * @plen: the transfer length 1496 */ 1497 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1498 { 1499 u64 lba = 0; 1500 u32 len = 0; 1501 1502 VPRINTK("sixteen-byte command\n"); 1503 1504 lba |= ((u64)cdb[2]) << 56; 1505 lba |= ((u64)cdb[3]) << 48; 1506 lba |= ((u64)cdb[4]) << 40; 1507 lba |= ((u64)cdb[5]) << 32; 1508 lba |= ((u64)cdb[6]) << 24; 1509 lba |= ((u64)cdb[7]) << 16; 1510 lba |= ((u64)cdb[8]) << 8; 1511 lba |= ((u64)cdb[9]); 1512 1513 len |= ((u32)cdb[10]) << 24; 1514 len |= ((u32)cdb[11]) << 16; 1515 len |= ((u32)cdb[12]) << 8; 1516 len |= ((u32)cdb[13]); 1517 1518 *plba = lba; 1519 *plen = len; 1520 } 1521 1522 /** 1523 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1524 * @qc: Storage for translated ATA taskfile 1525 * 1526 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1527 * 1528 * LOCKING: 1529 * spin_lock_irqsave(host lock) 1530 * 1531 * RETURNS: 1532 * Zero on success, non-zero on error. 1533 */ 1534 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1535 { 1536 struct scsi_cmnd *scmd = qc->scsicmd; 1537 struct ata_taskfile *tf = &qc->tf; 1538 struct ata_device *dev = qc->dev; 1539 u64 dev_sectors = qc->dev->n_sectors; 1540 const u8 *cdb = scmd->cmnd; 1541 u64 block; 1542 u32 n_block; 1543 1544 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1545 tf->protocol = ATA_PROT_NODATA; 1546 1547 if (cdb[0] == VERIFY) { 1548 if (scmd->cmd_len < 10) 1549 goto invalid_fld; 1550 scsi_10_lba_len(cdb, &block, &n_block); 1551 } else if (cdb[0] == VERIFY_16) { 1552 if (scmd->cmd_len < 16) 1553 goto invalid_fld; 1554 scsi_16_lba_len(cdb, &block, &n_block); 1555 } else 1556 goto invalid_fld; 1557 1558 if (!n_block) 1559 goto nothing_to_do; 1560 if (block >= dev_sectors) 1561 goto out_of_range; 1562 if ((block + n_block) > dev_sectors) 1563 goto out_of_range; 1564 1565 if (dev->flags & ATA_DFLAG_LBA) { 1566 tf->flags |= ATA_TFLAG_LBA; 1567 1568 if (lba_28_ok(block, n_block)) { 1569 /* use LBA28 */ 1570 tf->command = ATA_CMD_VERIFY; 1571 tf->device |= (block >> 24) & 0xf; 1572 } else if (lba_48_ok(block, n_block)) { 1573 if (!(dev->flags & ATA_DFLAG_LBA48)) 1574 goto out_of_range; 1575 1576 /* use LBA48 */ 1577 tf->flags |= ATA_TFLAG_LBA48; 1578 tf->command = ATA_CMD_VERIFY_EXT; 1579 1580 tf->hob_nsect = (n_block >> 8) & 0xff; 1581 1582 tf->hob_lbah = (block >> 40) & 0xff; 1583 tf->hob_lbam = (block >> 32) & 0xff; 1584 tf->hob_lbal = (block >> 24) & 0xff; 1585 } else 1586 /* request too large even for LBA48 */ 1587 goto out_of_range; 1588 1589 tf->nsect = n_block & 0xff; 1590 1591 tf->lbah = (block >> 16) & 0xff; 1592 tf->lbam = (block >> 8) & 0xff; 1593 tf->lbal = block & 0xff; 1594 1595 tf->device |= ATA_LBA; 1596 } else { 1597 /* CHS */ 1598 u32 sect, head, cyl, track; 1599 1600 if (!lba_28_ok(block, n_block)) 1601 goto out_of_range; 1602 1603 /* Convert LBA to CHS */ 1604 track = (u32)block / dev->sectors; 1605 cyl = track / dev->heads; 1606 head = track % dev->heads; 1607 sect = (u32)block % dev->sectors + 1; 1608 1609 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1610 (u32)block, track, cyl, head, sect); 1611 1612 /* Check whether the converted CHS can fit. 1613 Cylinder: 0-65535 1614 Head: 0-15 1615 Sector: 1-255*/ 1616 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1617 goto out_of_range; 1618 1619 tf->command = ATA_CMD_VERIFY; 1620 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1621 tf->lbal = sect; 1622 tf->lbam = cyl; 1623 tf->lbah = cyl >> 8; 1624 tf->device |= head; 1625 } 1626 1627 return 0; 1628 1629 invalid_fld: 1630 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1631 /* "Invalid field in cbd" */ 1632 return 1; 1633 1634 out_of_range: 1635 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1636 /* "Logical Block Address out of range" */ 1637 return 1; 1638 1639 nothing_to_do: 1640 scmd->result = SAM_STAT_GOOD; 1641 return 1; 1642 } 1643 1644 /** 1645 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1646 * @qc: Storage for translated ATA taskfile 1647 * 1648 * Converts any of six SCSI read/write commands into the 1649 * ATA counterpart, including starting sector (LBA), 1650 * sector count, and taking into account the device's LBA48 1651 * support. 1652 * 1653 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1654 * %WRITE_16 are currently supported. 1655 * 1656 * LOCKING: 1657 * spin_lock_irqsave(host lock) 1658 * 1659 * RETURNS: 1660 * Zero on success, non-zero on error. 1661 */ 1662 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1663 { 1664 struct scsi_cmnd *scmd = qc->scsicmd; 1665 const u8 *cdb = scmd->cmnd; 1666 unsigned int tf_flags = 0; 1667 u64 block; 1668 u32 n_block; 1669 int rc; 1670 1671 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1672 tf_flags |= ATA_TFLAG_WRITE; 1673 1674 /* Calculate the SCSI LBA, transfer length and FUA. */ 1675 switch (cdb[0]) { 1676 case READ_10: 1677 case WRITE_10: 1678 if (unlikely(scmd->cmd_len < 10)) 1679 goto invalid_fld; 1680 scsi_10_lba_len(cdb, &block, &n_block); 1681 if (cdb[1] & (1 << 3)) 1682 tf_flags |= ATA_TFLAG_FUA; 1683 break; 1684 case READ_6: 1685 case WRITE_6: 1686 if (unlikely(scmd->cmd_len < 6)) 1687 goto invalid_fld; 1688 scsi_6_lba_len(cdb, &block, &n_block); 1689 1690 /* for 6-byte r/w commands, transfer length 0 1691 * means 256 blocks of data, not 0 block. 1692 */ 1693 if (!n_block) 1694 n_block = 256; 1695 break; 1696 case READ_16: 1697 case WRITE_16: 1698 if (unlikely(scmd->cmd_len < 16)) 1699 goto invalid_fld; 1700 scsi_16_lba_len(cdb, &block, &n_block); 1701 if (cdb[1] & (1 << 3)) 1702 tf_flags |= ATA_TFLAG_FUA; 1703 break; 1704 default: 1705 DPRINTK("no-byte command\n"); 1706 goto invalid_fld; 1707 } 1708 1709 /* Check and compose ATA command */ 1710 if (!n_block) 1711 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1712 * length 0 means transfer 0 block of data. 1713 * However, for ATA R/W commands, sector count 0 means 1714 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1715 * 1716 * WARNING: one or two older ATA drives treat 0 as 0... 1717 */ 1718 goto nothing_to_do; 1719 1720 qc->flags |= ATA_QCFLAG_IO; 1721 qc->nbytes = n_block * scmd->device->sector_size; 1722 1723 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1724 qc->tag); 1725 if (likely(rc == 0)) 1726 return 0; 1727 1728 if (rc == -ERANGE) 1729 goto out_of_range; 1730 /* treat all other errors as -EINVAL, fall through */ 1731 invalid_fld: 1732 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1733 /* "Invalid field in cbd" */ 1734 return 1; 1735 1736 out_of_range: 1737 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1738 /* "Logical Block Address out of range" */ 1739 return 1; 1740 1741 nothing_to_do: 1742 scmd->result = SAM_STAT_GOOD; 1743 return 1; 1744 } 1745 1746 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1747 { 1748 struct ata_port *ap = qc->ap; 1749 struct scsi_cmnd *cmd = qc->scsicmd; 1750 u8 *cdb = cmd->cmnd; 1751 int need_sense = (qc->err_mask != 0); 1752 1753 /* For ATA pass thru (SAT) commands, generate a sense block if 1754 * user mandated it or if there's an error. Note that if we 1755 * generate because the user forced us to [CK_COND =1], a check 1756 * condition is generated and the ATA register values are returned 1757 * whether the command completed successfully or not. If there 1758 * was no error, we use the following sense data: 1759 * sk = RECOVERED ERROR 1760 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1761 */ 1762 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1763 ((cdb[2] & 0x20) || need_sense)) { 1764 ata_gen_passthru_sense(qc); 1765 } else { 1766 if (!need_sense) { 1767 cmd->result = SAM_STAT_GOOD; 1768 } else { 1769 /* TODO: decide which descriptor format to use 1770 * for 48b LBA devices and call that here 1771 * instead of the fixed desc, which is only 1772 * good for smaller LBA (and maybe CHS?) 1773 * devices. 1774 */ 1775 ata_gen_ata_sense(qc); 1776 } 1777 } 1778 1779 if (need_sense && !ap->ops->error_handler) 1780 ata_dump_status(ap->print_id, &qc->result_tf); 1781 1782 qc->scsidone(cmd); 1783 1784 ata_qc_free(qc); 1785 } 1786 1787 /** 1788 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1789 * @dev: ATA device to which the command is addressed 1790 * @cmd: SCSI command to execute 1791 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1792 * 1793 * Our ->queuecommand() function has decided that the SCSI 1794 * command issued can be directly translated into an ATA 1795 * command, rather than handled internally. 1796 * 1797 * This function sets up an ata_queued_cmd structure for the 1798 * SCSI command, and sends that ata_queued_cmd to the hardware. 1799 * 1800 * The xlat_func argument (actor) returns 0 if ready to execute 1801 * ATA command, else 1 to finish translation. If 1 is returned 1802 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1803 * to be set reflecting an error condition or clean (early) 1804 * termination. 1805 * 1806 * LOCKING: 1807 * spin_lock_irqsave(host lock) 1808 * 1809 * RETURNS: 1810 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1811 * needs to be deferred. 1812 */ 1813 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1814 ata_xlat_func_t xlat_func) 1815 { 1816 struct ata_port *ap = dev->link->ap; 1817 struct ata_queued_cmd *qc; 1818 int rc; 1819 1820 VPRINTK("ENTER\n"); 1821 1822 qc = ata_scsi_qc_new(dev, cmd); 1823 if (!qc) 1824 goto err_mem; 1825 1826 /* data is present; dma-map it */ 1827 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1828 cmd->sc_data_direction == DMA_TO_DEVICE) { 1829 if (unlikely(scsi_bufflen(cmd) < 1)) { 1830 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1831 goto err_did; 1832 } 1833 1834 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1835 1836 qc->dma_dir = cmd->sc_data_direction; 1837 } 1838 1839 qc->complete_fn = ata_scsi_qc_complete; 1840 1841 if (xlat_func(qc)) 1842 goto early_finish; 1843 1844 if (ap->ops->qc_defer) { 1845 if ((rc = ap->ops->qc_defer(qc))) 1846 goto defer; 1847 } 1848 1849 /* select device, send command to hardware */ 1850 ata_qc_issue(qc); 1851 1852 VPRINTK("EXIT\n"); 1853 return 0; 1854 1855 early_finish: 1856 ata_qc_free(qc); 1857 cmd->scsi_done(cmd); 1858 DPRINTK("EXIT - early finish (good or error)\n"); 1859 return 0; 1860 1861 err_did: 1862 ata_qc_free(qc); 1863 cmd->result = (DID_ERROR << 16); 1864 cmd->scsi_done(cmd); 1865 err_mem: 1866 DPRINTK("EXIT - internal\n"); 1867 return 0; 1868 1869 defer: 1870 ata_qc_free(qc); 1871 DPRINTK("EXIT - defer\n"); 1872 if (rc == ATA_DEFER_LINK) 1873 return SCSI_MLQUEUE_DEVICE_BUSY; 1874 else 1875 return SCSI_MLQUEUE_HOST_BUSY; 1876 } 1877 1878 /** 1879 * ata_scsi_rbuf_get - Map response buffer. 1880 * @cmd: SCSI command containing buffer to be mapped. 1881 * @flags: unsigned long variable to store irq enable status 1882 * @copy_in: copy in from user buffer 1883 * 1884 * Prepare buffer for simulated SCSI commands. 1885 * 1886 * LOCKING: 1887 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1888 * 1889 * RETURNS: 1890 * Pointer to response buffer. 1891 */ 1892 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1893 unsigned long *flags) 1894 { 1895 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1896 1897 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1898 if (copy_in) 1899 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1900 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1901 return ata_scsi_rbuf; 1902 } 1903 1904 /** 1905 * ata_scsi_rbuf_put - Unmap response buffer. 1906 * @cmd: SCSI command containing buffer to be unmapped. 1907 * @copy_out: copy out result 1908 * @flags: @flags passed to ata_scsi_rbuf_get() 1909 * 1910 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1911 * @copy_back is true. 1912 * 1913 * LOCKING: 1914 * Unlocks ata_scsi_rbuf_lock. 1915 */ 1916 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1917 unsigned long *flags) 1918 { 1919 if (copy_out) 1920 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1921 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1922 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1923 } 1924 1925 /** 1926 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1927 * @args: device IDENTIFY data / SCSI command of interest. 1928 * @actor: Callback hook for desired SCSI command simulator 1929 * 1930 * Takes care of the hard work of simulating a SCSI command... 1931 * Mapping the response buffer, calling the command's handler, 1932 * and handling the handler's return value. This return value 1933 * indicates whether the handler wishes the SCSI command to be 1934 * completed successfully (0), or not (in which case cmd->result 1935 * and sense buffer are assumed to be set). 1936 * 1937 * LOCKING: 1938 * spin_lock_irqsave(host lock) 1939 */ 1940 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1941 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1942 { 1943 u8 *rbuf; 1944 unsigned int rc; 1945 struct scsi_cmnd *cmd = args->cmd; 1946 unsigned long flags; 1947 1948 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1949 rc = actor(args, rbuf); 1950 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1951 1952 if (rc == 0) 1953 cmd->result = SAM_STAT_GOOD; 1954 args->done(cmd); 1955 } 1956 1957 /** 1958 * ata_scsiop_inq_std - Simulate INQUIRY command 1959 * @args: device IDENTIFY data / SCSI command of interest. 1960 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1961 * 1962 * Returns standard device identification data associated 1963 * with non-VPD INQUIRY command output. 1964 * 1965 * LOCKING: 1966 * spin_lock_irqsave(host lock) 1967 */ 1968 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1969 { 1970 const u8 versions[] = { 1971 0x60, /* SAM-3 (no version claimed) */ 1972 1973 0x03, 1974 0x20, /* SBC-2 (no version claimed) */ 1975 1976 0x02, 1977 0x60 /* SPC-3 (no version claimed) */ 1978 }; 1979 u8 hdr[] = { 1980 TYPE_DISK, 1981 0, 1982 0x5, /* claim SPC-3 version compatibility */ 1983 2, 1984 95 - 4 1985 }; 1986 1987 VPRINTK("ENTER\n"); 1988 1989 /* set scsi removeable (RMB) bit per ata bit */ 1990 if (ata_id_removeable(args->id)) 1991 hdr[1] |= (1 << 7); 1992 1993 memcpy(rbuf, hdr, sizeof(hdr)); 1994 memcpy(&rbuf[8], "ATA ", 8); 1995 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1996 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1997 1998 if (rbuf[32] == 0 || rbuf[32] == ' ') 1999 memcpy(&rbuf[32], "n/a ", 4); 2000 2001 memcpy(rbuf + 59, versions, sizeof(versions)); 2002 2003 return 0; 2004 } 2005 2006 /** 2007 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2008 * @args: device IDENTIFY data / SCSI command of interest. 2009 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2010 * 2011 * Returns list of inquiry VPD pages available. 2012 * 2013 * LOCKING: 2014 * spin_lock_irqsave(host lock) 2015 */ 2016 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2017 { 2018 const u8 pages[] = { 2019 0x00, /* page 0x00, this page */ 2020 0x80, /* page 0x80, unit serial no page */ 2021 0x83, /* page 0x83, device ident page */ 2022 0x89, /* page 0x89, ata info page */ 2023 0xb0, /* page 0xb0, block limits page */ 2024 0xb1, /* page 0xb1, block device characteristics page */ 2025 0xb2, /* page 0xb2, thin provisioning page */ 2026 }; 2027 2028 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2029 memcpy(rbuf + 4, pages, sizeof(pages)); 2030 return 0; 2031 } 2032 2033 /** 2034 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2035 * @args: device IDENTIFY data / SCSI command of interest. 2036 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2037 * 2038 * Returns ATA device serial number. 2039 * 2040 * LOCKING: 2041 * spin_lock_irqsave(host lock) 2042 */ 2043 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2044 { 2045 const u8 hdr[] = { 2046 0, 2047 0x80, /* this page code */ 2048 0, 2049 ATA_ID_SERNO_LEN, /* page len */ 2050 }; 2051 2052 memcpy(rbuf, hdr, sizeof(hdr)); 2053 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2054 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2055 return 0; 2056 } 2057 2058 /** 2059 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2060 * @args: device IDENTIFY data / SCSI command of interest. 2061 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2062 * 2063 * Yields two logical unit device identification designators: 2064 * - vendor specific ASCII containing the ATA serial number 2065 * - SAT defined "t10 vendor id based" containing ASCII vendor 2066 * name ("ATA "), model and serial numbers. 2067 * 2068 * LOCKING: 2069 * spin_lock_irqsave(host lock) 2070 */ 2071 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2072 { 2073 const int sat_model_serial_desc_len = 68; 2074 int num; 2075 2076 rbuf[1] = 0x83; /* this page code */ 2077 num = 4; 2078 2079 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2080 rbuf[num + 0] = 2; 2081 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2082 num += 4; 2083 ata_id_string(args->id, (unsigned char *) rbuf + num, 2084 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2085 num += ATA_ID_SERNO_LEN; 2086 2087 /* SAT defined lu model and serial numbers descriptor */ 2088 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2089 rbuf[num + 0] = 2; 2090 rbuf[num + 1] = 1; 2091 rbuf[num + 3] = sat_model_serial_desc_len; 2092 num += 4; 2093 memcpy(rbuf + num, "ATA ", 8); 2094 num += 8; 2095 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2096 ATA_ID_PROD_LEN); 2097 num += ATA_ID_PROD_LEN; 2098 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2099 ATA_ID_SERNO_LEN); 2100 num += ATA_ID_SERNO_LEN; 2101 2102 if (ata_id_has_wwn(args->id)) { 2103 /* SAT defined lu world wide name */ 2104 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2105 rbuf[num + 0] = 1; 2106 rbuf[num + 1] = 3; 2107 rbuf[num + 3] = ATA_ID_WWN_LEN; 2108 num += 4; 2109 ata_id_string(args->id, (unsigned char *) rbuf + num, 2110 ATA_ID_WWN, ATA_ID_WWN_LEN); 2111 num += ATA_ID_WWN_LEN; 2112 } 2113 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2114 return 0; 2115 } 2116 2117 /** 2118 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2119 * @args: device IDENTIFY data / SCSI command of interest. 2120 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2121 * 2122 * Yields SAT-specified ATA VPD page. 2123 * 2124 * LOCKING: 2125 * spin_lock_irqsave(host lock) 2126 */ 2127 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2128 { 2129 struct ata_taskfile tf; 2130 2131 memset(&tf, 0, sizeof(tf)); 2132 2133 rbuf[1] = 0x89; /* our page code */ 2134 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2135 rbuf[3] = (0x238 & 0xff); 2136 2137 memcpy(&rbuf[8], "linux ", 8); 2138 memcpy(&rbuf[16], "libata ", 16); 2139 memcpy(&rbuf[32], DRV_VERSION, 4); 2140 2141 /* we don't store the ATA device signature, so we fake it */ 2142 2143 tf.command = ATA_DRDY; /* really, this is Status reg */ 2144 tf.lbal = 0x1; 2145 tf.nsect = 0x1; 2146 2147 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2148 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2149 2150 rbuf[56] = ATA_CMD_ID_ATA; 2151 2152 memcpy(&rbuf[60], &args->id[0], 512); 2153 return 0; 2154 } 2155 2156 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2157 { 2158 u16 min_io_sectors; 2159 2160 rbuf[1] = 0xb0; 2161 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2162 2163 /* 2164 * Optimal transfer length granularity. 2165 * 2166 * This is always one physical block, but for disks with a smaller 2167 * logical than physical sector size we need to figure out what the 2168 * latter is. 2169 */ 2170 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2171 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2172 2173 /* 2174 * Optimal unmap granularity. 2175 * 2176 * The ATA spec doesn't even know about a granularity or alignment 2177 * for the TRIM command. We can leave away most of the unmap related 2178 * VPD page entries, but we have specifify a granularity to signal 2179 * that we support some form of unmap - in thise case via WRITE SAME 2180 * with the unmap bit set. 2181 */ 2182 if (ata_id_has_trim(args->id)) { 2183 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2184 put_unaligned_be32(1, &rbuf[28]); 2185 } 2186 2187 return 0; 2188 } 2189 2190 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2191 { 2192 int form_factor = ata_id_form_factor(args->id); 2193 int media_rotation_rate = ata_id_rotation_rate(args->id); 2194 2195 rbuf[1] = 0xb1; 2196 rbuf[3] = 0x3c; 2197 rbuf[4] = media_rotation_rate >> 8; 2198 rbuf[5] = media_rotation_rate; 2199 rbuf[7] = form_factor; 2200 2201 return 0; 2202 } 2203 2204 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2205 { 2206 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2207 rbuf[1] = 0xb2; 2208 rbuf[3] = 0x4; 2209 rbuf[5] = 1 << 6; /* TPWS */ 2210 2211 return 0; 2212 } 2213 2214 /** 2215 * ata_scsiop_noop - Command handler that simply returns success. 2216 * @args: device IDENTIFY data / SCSI command of interest. 2217 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2218 * 2219 * No operation. Simply returns success to caller, to indicate 2220 * that the caller should successfully complete this SCSI command. 2221 * 2222 * LOCKING: 2223 * spin_lock_irqsave(host lock) 2224 */ 2225 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2226 { 2227 VPRINTK("ENTER\n"); 2228 return 0; 2229 } 2230 2231 /** 2232 * modecpy - Prepare response for MODE SENSE 2233 * @dest: output buffer 2234 * @src: data being copied 2235 * @n: length of mode page 2236 * @changeable: whether changeable parameters are requested 2237 * 2238 * Generate a generic MODE SENSE page for either current or changeable 2239 * parameters. 2240 * 2241 * LOCKING: 2242 * None. 2243 */ 2244 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2245 { 2246 if (changeable) { 2247 memcpy(dest, src, 2); 2248 memset(dest + 2, 0, n - 2); 2249 } else { 2250 memcpy(dest, src, n); 2251 } 2252 } 2253 2254 /** 2255 * ata_msense_caching - Simulate MODE SENSE caching info page 2256 * @id: device IDENTIFY data 2257 * @buf: output buffer 2258 * @changeable: whether changeable parameters are requested 2259 * 2260 * Generate a caching info page, which conditionally indicates 2261 * write caching to the SCSI layer, depending on device 2262 * capabilities. 2263 * 2264 * LOCKING: 2265 * None. 2266 */ 2267 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2268 { 2269 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2270 if (changeable || ata_id_wcache_enabled(id)) 2271 buf[2] |= (1 << 2); /* write cache enable */ 2272 if (!changeable && !ata_id_rahead_enabled(id)) 2273 buf[12] |= (1 << 5); /* disable read ahead */ 2274 return sizeof(def_cache_mpage); 2275 } 2276 2277 /** 2278 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2279 * @buf: output buffer 2280 * @changeable: whether changeable parameters are requested 2281 * 2282 * Generate a generic MODE SENSE control mode page. 2283 * 2284 * LOCKING: 2285 * None. 2286 */ 2287 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2288 { 2289 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2290 return sizeof(def_control_mpage); 2291 } 2292 2293 /** 2294 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2295 * @buf: output buffer 2296 * @changeable: whether changeable parameters are requested 2297 * 2298 * Generate a generic MODE SENSE r/w error recovery page. 2299 * 2300 * LOCKING: 2301 * None. 2302 */ 2303 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2304 { 2305 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2306 changeable); 2307 return sizeof(def_rw_recovery_mpage); 2308 } 2309 2310 /* 2311 * We can turn this into a real blacklist if it's needed, for now just 2312 * blacklist any Maxtor BANC1G10 revision firmware 2313 */ 2314 static int ata_dev_supports_fua(u16 *id) 2315 { 2316 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2317 2318 if (!libata_fua) 2319 return 0; 2320 if (!ata_id_has_fua(id)) 2321 return 0; 2322 2323 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2324 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2325 2326 if (strcmp(model, "Maxtor")) 2327 return 1; 2328 if (strcmp(fw, "BANC1G10")) 2329 return 1; 2330 2331 return 0; /* blacklisted */ 2332 } 2333 2334 /** 2335 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2336 * @args: device IDENTIFY data / SCSI command of interest. 2337 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2338 * 2339 * Simulate MODE SENSE commands. Assume this is invoked for direct 2340 * access devices (e.g. disks) only. There should be no block 2341 * descriptor for other device types. 2342 * 2343 * LOCKING: 2344 * spin_lock_irqsave(host lock) 2345 */ 2346 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2347 { 2348 struct ata_device *dev = args->dev; 2349 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2350 const u8 sat_blk_desc[] = { 2351 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2352 0, 2353 0, 0x2, 0x0 /* block length: 512 bytes */ 2354 }; 2355 u8 pg, spg; 2356 unsigned int ebd, page_control, six_byte; 2357 u8 dpofua; 2358 2359 VPRINTK("ENTER\n"); 2360 2361 six_byte = (scsicmd[0] == MODE_SENSE); 2362 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2363 /* 2364 * LLBA bit in msense(10) ignored (compliant) 2365 */ 2366 2367 page_control = scsicmd[2] >> 6; 2368 switch (page_control) { 2369 case 0: /* current */ 2370 case 1: /* changeable */ 2371 case 2: /* defaults */ 2372 break; /* supported */ 2373 case 3: /* saved */ 2374 goto saving_not_supp; 2375 default: 2376 goto invalid_fld; 2377 } 2378 2379 if (six_byte) 2380 p += 4 + (ebd ? 8 : 0); 2381 else 2382 p += 8 + (ebd ? 8 : 0); 2383 2384 pg = scsicmd[2] & 0x3f; 2385 spg = scsicmd[3]; 2386 /* 2387 * No mode subpages supported (yet) but asking for _all_ 2388 * subpages may be valid 2389 */ 2390 if (spg && (spg != ALL_SUB_MPAGES)) 2391 goto invalid_fld; 2392 2393 switch(pg) { 2394 case RW_RECOVERY_MPAGE: 2395 p += ata_msense_rw_recovery(p, page_control == 1); 2396 break; 2397 2398 case CACHE_MPAGE: 2399 p += ata_msense_caching(args->id, p, page_control == 1); 2400 break; 2401 2402 case CONTROL_MPAGE: 2403 p += ata_msense_ctl_mode(p, page_control == 1); 2404 break; 2405 2406 case ALL_MPAGES: 2407 p += ata_msense_rw_recovery(p, page_control == 1); 2408 p += ata_msense_caching(args->id, p, page_control == 1); 2409 p += ata_msense_ctl_mode(p, page_control == 1); 2410 break; 2411 2412 default: /* invalid page code */ 2413 goto invalid_fld; 2414 } 2415 2416 dpofua = 0; 2417 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2418 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2419 dpofua = 1 << 4; 2420 2421 if (six_byte) { 2422 rbuf[0] = p - rbuf - 1; 2423 rbuf[2] |= dpofua; 2424 if (ebd) { 2425 rbuf[3] = sizeof(sat_blk_desc); 2426 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2427 } 2428 } else { 2429 unsigned int output_len = p - rbuf - 2; 2430 2431 rbuf[0] = output_len >> 8; 2432 rbuf[1] = output_len; 2433 rbuf[3] |= dpofua; 2434 if (ebd) { 2435 rbuf[7] = sizeof(sat_blk_desc); 2436 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2437 } 2438 } 2439 return 0; 2440 2441 invalid_fld: 2442 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2443 /* "Invalid field in cbd" */ 2444 return 1; 2445 2446 saving_not_supp: 2447 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2448 /* "Saving parameters not supported" */ 2449 return 1; 2450 } 2451 2452 /** 2453 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2454 * @args: device IDENTIFY data / SCSI command of interest. 2455 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2456 * 2457 * Simulate READ CAPACITY commands. 2458 * 2459 * LOCKING: 2460 * None. 2461 */ 2462 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2463 { 2464 struct ata_device *dev = args->dev; 2465 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2466 u32 sector_size; /* physical sector size in bytes */ 2467 u8 log2_per_phys; 2468 u16 lowest_aligned; 2469 2470 sector_size = ata_id_logical_sector_size(dev->id); 2471 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2472 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2473 2474 VPRINTK("ENTER\n"); 2475 2476 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2477 if (last_lba >= 0xffffffffULL) 2478 last_lba = 0xffffffff; 2479 2480 /* sector count, 32-bit */ 2481 rbuf[0] = last_lba >> (8 * 3); 2482 rbuf[1] = last_lba >> (8 * 2); 2483 rbuf[2] = last_lba >> (8 * 1); 2484 rbuf[3] = last_lba; 2485 2486 /* sector size */ 2487 rbuf[4] = sector_size >> (8 * 3); 2488 rbuf[5] = sector_size >> (8 * 2); 2489 rbuf[6] = sector_size >> (8 * 1); 2490 rbuf[7] = sector_size; 2491 } else { 2492 /* sector count, 64-bit */ 2493 rbuf[0] = last_lba >> (8 * 7); 2494 rbuf[1] = last_lba >> (8 * 6); 2495 rbuf[2] = last_lba >> (8 * 5); 2496 rbuf[3] = last_lba >> (8 * 4); 2497 rbuf[4] = last_lba >> (8 * 3); 2498 rbuf[5] = last_lba >> (8 * 2); 2499 rbuf[6] = last_lba >> (8 * 1); 2500 rbuf[7] = last_lba; 2501 2502 /* sector size */ 2503 rbuf[ 8] = sector_size >> (8 * 3); 2504 rbuf[ 9] = sector_size >> (8 * 2); 2505 rbuf[10] = sector_size >> (8 * 1); 2506 rbuf[11] = sector_size; 2507 2508 rbuf[12] = 0; 2509 rbuf[13] = log2_per_phys; 2510 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2511 rbuf[15] = lowest_aligned; 2512 2513 if (ata_id_has_trim(args->id)) { 2514 rbuf[14] |= 0x80; /* TPE */ 2515 2516 if (ata_id_has_zero_after_trim(args->id)) 2517 rbuf[14] |= 0x40; /* TPRZ */ 2518 } 2519 } 2520 2521 return 0; 2522 } 2523 2524 /** 2525 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2526 * @args: device IDENTIFY data / SCSI command of interest. 2527 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2528 * 2529 * Simulate REPORT LUNS command. 2530 * 2531 * LOCKING: 2532 * spin_lock_irqsave(host lock) 2533 */ 2534 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2535 { 2536 VPRINTK("ENTER\n"); 2537 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2538 2539 return 0; 2540 } 2541 2542 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2543 { 2544 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2545 /* FIXME: not quite right; we don't want the 2546 * translation of taskfile registers into 2547 * a sense descriptors, since that's only 2548 * correct for ATA, not ATAPI 2549 */ 2550 ata_gen_passthru_sense(qc); 2551 } 2552 2553 qc->scsidone(qc->scsicmd); 2554 ata_qc_free(qc); 2555 } 2556 2557 /* is it pointless to prefer PIO for "safety reasons"? */ 2558 static inline int ata_pio_use_silly(struct ata_port *ap) 2559 { 2560 return (ap->flags & ATA_FLAG_PIO_DMA); 2561 } 2562 2563 static void atapi_request_sense(struct ata_queued_cmd *qc) 2564 { 2565 struct ata_port *ap = qc->ap; 2566 struct scsi_cmnd *cmd = qc->scsicmd; 2567 2568 DPRINTK("ATAPI request sense\n"); 2569 2570 /* FIXME: is this needed? */ 2571 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2572 2573 #ifdef CONFIG_ATA_SFF 2574 if (ap->ops->sff_tf_read) 2575 ap->ops->sff_tf_read(ap, &qc->tf); 2576 #endif 2577 2578 /* fill these in, for the case where they are -not- overwritten */ 2579 cmd->sense_buffer[0] = 0x70; 2580 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2581 2582 ata_qc_reinit(qc); 2583 2584 /* setup sg table and init transfer direction */ 2585 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2586 ata_sg_init(qc, &qc->sgent, 1); 2587 qc->dma_dir = DMA_FROM_DEVICE; 2588 2589 memset(&qc->cdb, 0, qc->dev->cdb_len); 2590 qc->cdb[0] = REQUEST_SENSE; 2591 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2592 2593 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2594 qc->tf.command = ATA_CMD_PACKET; 2595 2596 if (ata_pio_use_silly(ap)) { 2597 qc->tf.protocol = ATAPI_PROT_DMA; 2598 qc->tf.feature |= ATAPI_PKT_DMA; 2599 } else { 2600 qc->tf.protocol = ATAPI_PROT_PIO; 2601 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2602 qc->tf.lbah = 0; 2603 } 2604 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2605 2606 qc->complete_fn = atapi_sense_complete; 2607 2608 ata_qc_issue(qc); 2609 2610 DPRINTK("EXIT\n"); 2611 } 2612 2613 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2614 { 2615 struct scsi_cmnd *cmd = qc->scsicmd; 2616 unsigned int err_mask = qc->err_mask; 2617 2618 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2619 2620 /* handle completion from new EH */ 2621 if (unlikely(qc->ap->ops->error_handler && 2622 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2623 2624 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2625 /* FIXME: not quite right; we don't want the 2626 * translation of taskfile registers into a 2627 * sense descriptors, since that's only 2628 * correct for ATA, not ATAPI 2629 */ 2630 ata_gen_passthru_sense(qc); 2631 } 2632 2633 /* SCSI EH automatically locks door if sdev->locked is 2634 * set. Sometimes door lock request continues to 2635 * fail, for example, when no media is present. This 2636 * creates a loop - SCSI EH issues door lock which 2637 * fails and gets invoked again to acquire sense data 2638 * for the failed command. 2639 * 2640 * If door lock fails, always clear sdev->locked to 2641 * avoid this infinite loop. 2642 * 2643 * This may happen before SCSI scan is complete. Make 2644 * sure qc->dev->sdev isn't NULL before dereferencing. 2645 */ 2646 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2647 qc->dev->sdev->locked = 0; 2648 2649 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2650 qc->scsidone(cmd); 2651 ata_qc_free(qc); 2652 return; 2653 } 2654 2655 /* successful completion or old EH failure path */ 2656 if (unlikely(err_mask & AC_ERR_DEV)) { 2657 cmd->result = SAM_STAT_CHECK_CONDITION; 2658 atapi_request_sense(qc); 2659 return; 2660 } else if (unlikely(err_mask)) { 2661 /* FIXME: not quite right; we don't want the 2662 * translation of taskfile registers into 2663 * a sense descriptors, since that's only 2664 * correct for ATA, not ATAPI 2665 */ 2666 ata_gen_passthru_sense(qc); 2667 } else { 2668 u8 *scsicmd = cmd->cmnd; 2669 2670 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2671 unsigned long flags; 2672 u8 *buf; 2673 2674 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2675 2676 /* ATAPI devices typically report zero for their SCSI version, 2677 * and sometimes deviate from the spec WRT response data 2678 * format. If SCSI version is reported as zero like normal, 2679 * then we make the following fixups: 1) Fake MMC-5 version, 2680 * to indicate to the Linux scsi midlayer this is a modern 2681 * device. 2) Ensure response data format / ATAPI information 2682 * are always correct. 2683 */ 2684 if (buf[2] == 0) { 2685 buf[2] = 0x5; 2686 buf[3] = 0x32; 2687 } 2688 2689 ata_scsi_rbuf_put(cmd, true, &flags); 2690 } 2691 2692 cmd->result = SAM_STAT_GOOD; 2693 } 2694 2695 qc->scsidone(cmd); 2696 ata_qc_free(qc); 2697 } 2698 /** 2699 * atapi_xlat - Initialize PACKET taskfile 2700 * @qc: command structure to be initialized 2701 * 2702 * LOCKING: 2703 * spin_lock_irqsave(host lock) 2704 * 2705 * RETURNS: 2706 * Zero on success, non-zero on failure. 2707 */ 2708 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2709 { 2710 struct scsi_cmnd *scmd = qc->scsicmd; 2711 struct ata_device *dev = qc->dev; 2712 int nodata = (scmd->sc_data_direction == DMA_NONE); 2713 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2714 unsigned int nbytes; 2715 2716 memset(qc->cdb, 0, dev->cdb_len); 2717 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2718 2719 qc->complete_fn = atapi_qc_complete; 2720 2721 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2722 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2723 qc->tf.flags |= ATA_TFLAG_WRITE; 2724 DPRINTK("direction: write\n"); 2725 } 2726 2727 qc->tf.command = ATA_CMD_PACKET; 2728 ata_qc_set_pc_nbytes(qc); 2729 2730 /* check whether ATAPI DMA is safe */ 2731 if (!nodata && !using_pio && atapi_check_dma(qc)) 2732 using_pio = 1; 2733 2734 /* Some controller variants snoop this value for Packet 2735 * transfers to do state machine and FIFO management. Thus we 2736 * want to set it properly, and for DMA where it is 2737 * effectively meaningless. 2738 */ 2739 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2740 2741 /* Most ATAPI devices which honor transfer chunk size don't 2742 * behave according to the spec when odd chunk size which 2743 * matches the transfer length is specified. If the number of 2744 * bytes to transfer is 2n+1. According to the spec, what 2745 * should happen is to indicate that 2n+1 is going to be 2746 * transferred and transfer 2n+2 bytes where the last byte is 2747 * padding. 2748 * 2749 * In practice, this doesn't happen. ATAPI devices first 2750 * indicate and transfer 2n bytes and then indicate and 2751 * transfer 2 bytes where the last byte is padding. 2752 * 2753 * This inconsistency confuses several controllers which 2754 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2755 * These controllers use actual number of transferred bytes to 2756 * update DMA poitner and transfer of 4n+2 bytes make those 2757 * controller push DMA pointer by 4n+4 bytes because SATA data 2758 * FISes are aligned to 4 bytes. This causes data corruption 2759 * and buffer overrun. 2760 * 2761 * Always setting nbytes to even number solves this problem 2762 * because then ATAPI devices don't have to split data at 2n 2763 * boundaries. 2764 */ 2765 if (nbytes & 0x1) 2766 nbytes++; 2767 2768 qc->tf.lbam = (nbytes & 0xFF); 2769 qc->tf.lbah = (nbytes >> 8); 2770 2771 if (nodata) 2772 qc->tf.protocol = ATAPI_PROT_NODATA; 2773 else if (using_pio) 2774 qc->tf.protocol = ATAPI_PROT_PIO; 2775 else { 2776 /* DMA data xfer */ 2777 qc->tf.protocol = ATAPI_PROT_DMA; 2778 qc->tf.feature |= ATAPI_PKT_DMA; 2779 2780 if ((dev->flags & ATA_DFLAG_DMADIR) && 2781 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2782 /* some SATA bridges need us to indicate data xfer direction */ 2783 qc->tf.feature |= ATAPI_DMADIR; 2784 } 2785 2786 2787 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2788 as ATAPI tape drives don't get this right otherwise */ 2789 return 0; 2790 } 2791 2792 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2793 { 2794 if (!sata_pmp_attached(ap)) { 2795 if (likely(devno < ata_link_max_devices(&ap->link))) 2796 return &ap->link.device[devno]; 2797 } else { 2798 if (likely(devno < ap->nr_pmp_links)) 2799 return &ap->pmp_link[devno].device[0]; 2800 } 2801 2802 return NULL; 2803 } 2804 2805 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2806 const struct scsi_device *scsidev) 2807 { 2808 int devno; 2809 2810 /* skip commands not addressed to targets we simulate */ 2811 if (!sata_pmp_attached(ap)) { 2812 if (unlikely(scsidev->channel || scsidev->lun)) 2813 return NULL; 2814 devno = scsidev->id; 2815 } else { 2816 if (unlikely(scsidev->id || scsidev->lun)) 2817 return NULL; 2818 devno = scsidev->channel; 2819 } 2820 2821 return ata_find_dev(ap, devno); 2822 } 2823 2824 /** 2825 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2826 * @ap: ATA port to which the device is attached 2827 * @scsidev: SCSI device from which we derive the ATA device 2828 * 2829 * Given various information provided in struct scsi_cmnd, 2830 * map that onto an ATA bus, and using that mapping 2831 * determine which ata_device is associated with the 2832 * SCSI command to be sent. 2833 * 2834 * LOCKING: 2835 * spin_lock_irqsave(host lock) 2836 * 2837 * RETURNS: 2838 * Associated ATA device, or %NULL if not found. 2839 */ 2840 static struct ata_device * 2841 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2842 { 2843 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2844 2845 if (unlikely(!dev || !ata_dev_enabled(dev))) 2846 return NULL; 2847 2848 return dev; 2849 } 2850 2851 /* 2852 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2853 * @byte1: Byte 1 from pass-thru CDB. 2854 * 2855 * RETURNS: 2856 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2857 */ 2858 static u8 2859 ata_scsi_map_proto(u8 byte1) 2860 { 2861 switch((byte1 & 0x1e) >> 1) { 2862 case 3: /* Non-data */ 2863 return ATA_PROT_NODATA; 2864 2865 case 6: /* DMA */ 2866 case 10: /* UDMA Data-in */ 2867 case 11: /* UDMA Data-Out */ 2868 return ATA_PROT_DMA; 2869 2870 case 4: /* PIO Data-in */ 2871 case 5: /* PIO Data-out */ 2872 return ATA_PROT_PIO; 2873 2874 case 0: /* Hard Reset */ 2875 case 1: /* SRST */ 2876 case 8: /* Device Diagnostic */ 2877 case 9: /* Device Reset */ 2878 case 7: /* DMA Queued */ 2879 case 12: /* FPDMA */ 2880 case 15: /* Return Response Info */ 2881 default: /* Reserved */ 2882 break; 2883 } 2884 2885 return ATA_PROT_UNKNOWN; 2886 } 2887 2888 /** 2889 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2890 * @qc: command structure to be initialized 2891 * 2892 * Handles either 12 or 16-byte versions of the CDB. 2893 * 2894 * RETURNS: 2895 * Zero on success, non-zero on failure. 2896 */ 2897 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2898 { 2899 struct ata_taskfile *tf = &(qc->tf); 2900 struct scsi_cmnd *scmd = qc->scsicmd; 2901 struct ata_device *dev = qc->dev; 2902 const u8 *cdb = scmd->cmnd; 2903 2904 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2905 goto invalid_fld; 2906 2907 /* 2908 * 12 and 16 byte CDBs use different offsets to 2909 * provide the various register values. 2910 */ 2911 if (cdb[0] == ATA_16) { 2912 /* 2913 * 16-byte CDB - may contain extended commands. 2914 * 2915 * If that is the case, copy the upper byte register values. 2916 */ 2917 if (cdb[1] & 0x01) { 2918 tf->hob_feature = cdb[3]; 2919 tf->hob_nsect = cdb[5]; 2920 tf->hob_lbal = cdb[7]; 2921 tf->hob_lbam = cdb[9]; 2922 tf->hob_lbah = cdb[11]; 2923 tf->flags |= ATA_TFLAG_LBA48; 2924 } else 2925 tf->flags &= ~ATA_TFLAG_LBA48; 2926 2927 /* 2928 * Always copy low byte, device and command registers. 2929 */ 2930 tf->feature = cdb[4]; 2931 tf->nsect = cdb[6]; 2932 tf->lbal = cdb[8]; 2933 tf->lbam = cdb[10]; 2934 tf->lbah = cdb[12]; 2935 tf->device = cdb[13]; 2936 tf->command = cdb[14]; 2937 } else { 2938 /* 2939 * 12-byte CDB - incapable of extended commands. 2940 */ 2941 tf->flags &= ~ATA_TFLAG_LBA48; 2942 2943 tf->feature = cdb[3]; 2944 tf->nsect = cdb[4]; 2945 tf->lbal = cdb[5]; 2946 tf->lbam = cdb[6]; 2947 tf->lbah = cdb[7]; 2948 tf->device = cdb[8]; 2949 tf->command = cdb[9]; 2950 } 2951 2952 /* enforce correct master/slave bit */ 2953 tf->device = dev->devno ? 2954 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2955 2956 switch (tf->command) { 2957 /* READ/WRITE LONG use a non-standard sect_size */ 2958 case ATA_CMD_READ_LONG: 2959 case ATA_CMD_READ_LONG_ONCE: 2960 case ATA_CMD_WRITE_LONG: 2961 case ATA_CMD_WRITE_LONG_ONCE: 2962 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2963 goto invalid_fld; 2964 qc->sect_size = scsi_bufflen(scmd); 2965 break; 2966 2967 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2968 case ATA_CMD_CFA_WRITE_NE: 2969 case ATA_CMD_CFA_TRANS_SECT: 2970 case ATA_CMD_CFA_WRITE_MULT_NE: 2971 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2972 case ATA_CMD_READ: 2973 case ATA_CMD_READ_EXT: 2974 case ATA_CMD_READ_QUEUED: 2975 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2976 case ATA_CMD_FPDMA_READ: 2977 case ATA_CMD_READ_MULTI: 2978 case ATA_CMD_READ_MULTI_EXT: 2979 case ATA_CMD_PIO_READ: 2980 case ATA_CMD_PIO_READ_EXT: 2981 case ATA_CMD_READ_STREAM_DMA_EXT: 2982 case ATA_CMD_READ_STREAM_EXT: 2983 case ATA_CMD_VERIFY: 2984 case ATA_CMD_VERIFY_EXT: 2985 case ATA_CMD_WRITE: 2986 case ATA_CMD_WRITE_EXT: 2987 case ATA_CMD_WRITE_FUA_EXT: 2988 case ATA_CMD_WRITE_QUEUED: 2989 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2990 case ATA_CMD_FPDMA_WRITE: 2991 case ATA_CMD_WRITE_MULTI: 2992 case ATA_CMD_WRITE_MULTI_EXT: 2993 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2994 case ATA_CMD_PIO_WRITE: 2995 case ATA_CMD_PIO_WRITE_EXT: 2996 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2997 case ATA_CMD_WRITE_STREAM_EXT: 2998 qc->sect_size = scmd->device->sector_size; 2999 break; 3000 3001 /* Everything else uses 512 byte "sectors" */ 3002 default: 3003 qc->sect_size = ATA_SECT_SIZE; 3004 } 3005 3006 /* 3007 * Set flags so that all registers will be written, pass on 3008 * write indication (used for PIO/DMA setup), result TF is 3009 * copied back and we don't whine too much about its failure. 3010 */ 3011 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3012 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3013 tf->flags |= ATA_TFLAG_WRITE; 3014 3015 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3016 3017 /* 3018 * Set transfer length. 3019 * 3020 * TODO: find out if we need to do more here to 3021 * cover scatter/gather case. 3022 */ 3023 ata_qc_set_pc_nbytes(qc); 3024 3025 /* We may not issue DMA commands if no DMA mode is set */ 3026 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3027 goto invalid_fld; 3028 3029 /* sanity check for pio multi commands */ 3030 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3031 goto invalid_fld; 3032 3033 if (is_multi_taskfile(tf)) { 3034 unsigned int multi_count = 1 << (cdb[1] >> 5); 3035 3036 /* compare the passed through multi_count 3037 * with the cached multi_count of libata 3038 */ 3039 if (multi_count != dev->multi_count) 3040 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3041 multi_count); 3042 } 3043 3044 /* 3045 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3046 * SET_FEATURES - XFER MODE must be preceded/succeeded 3047 * by an update to hardware-specific registers for each 3048 * controller (i.e. the reason for ->set_piomode(), 3049 * ->set_dmamode(), and ->post_set_mode() hooks). 3050 */ 3051 if (tf->command == ATA_CMD_SET_FEATURES && 3052 tf->feature == SETFEATURES_XFER) 3053 goto invalid_fld; 3054 3055 /* 3056 * Filter TPM commands by default. These provide an 3057 * essentially uncontrolled encrypted "back door" between 3058 * applications and the disk. Set libata.allow_tpm=1 if you 3059 * have a real reason for wanting to use them. This ensures 3060 * that installed software cannot easily mess stuff up without 3061 * user intent. DVR type users will probably ship with this enabled 3062 * for movie content management. 3063 * 3064 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3065 * for this and should do in future but that it is not sufficient as 3066 * DCS is an optional feature set. Thus we also do the software filter 3067 * so that we comply with the TC consortium stated goal that the user 3068 * can turn off TC features of their system. 3069 */ 3070 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3071 goto invalid_fld; 3072 3073 return 0; 3074 3075 invalid_fld: 3076 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3077 /* "Invalid field in cdb" */ 3078 return 1; 3079 } 3080 3081 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3082 { 3083 struct ata_taskfile *tf = &qc->tf; 3084 struct scsi_cmnd *scmd = qc->scsicmd; 3085 struct ata_device *dev = qc->dev; 3086 const u8 *cdb = scmd->cmnd; 3087 u64 block; 3088 u32 n_block; 3089 u32 size; 3090 void *buf; 3091 3092 /* we may not issue DMA commands if no DMA mode is set */ 3093 if (unlikely(!dev->dma_mode)) 3094 goto invalid_fld; 3095 3096 if (unlikely(scmd->cmd_len < 16)) 3097 goto invalid_fld; 3098 scsi_16_lba_len(cdb, &block, &n_block); 3099 3100 /* for now we only support WRITE SAME with the unmap bit set */ 3101 if (unlikely(!(cdb[1] & 0x8))) 3102 goto invalid_fld; 3103 3104 /* 3105 * WRITE SAME always has a sector sized buffer as payload, this 3106 * should never be a multiple entry S/G list. 3107 */ 3108 if (!scsi_sg_count(scmd)) 3109 goto invalid_fld; 3110 3111 buf = page_address(sg_page(scsi_sglist(scmd))); 3112 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3113 3114 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3115 /* Newer devices support queued TRIM commands */ 3116 tf->protocol = ATA_PROT_NCQ; 3117 tf->command = ATA_CMD_FPDMA_SEND; 3118 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3119 tf->nsect = qc->tag << 3; 3120 tf->hob_feature = (size / 512) >> 8; 3121 tf->feature = size / 512; 3122 3123 tf->auxiliary = 1; 3124 } else { 3125 tf->protocol = ATA_PROT_DMA; 3126 tf->hob_feature = 0; 3127 tf->feature = ATA_DSM_TRIM; 3128 tf->hob_nsect = (size / 512) >> 8; 3129 tf->nsect = size / 512; 3130 tf->command = ATA_CMD_DSM; 3131 } 3132 3133 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3134 ATA_TFLAG_WRITE; 3135 3136 ata_qc_set_pc_nbytes(qc); 3137 3138 return 0; 3139 3140 invalid_fld: 3141 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3142 /* "Invalid field in cdb" */ 3143 return 1; 3144 } 3145 3146 /** 3147 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3148 * @qc: Storage for translated ATA taskfile 3149 * @buf: input buffer 3150 * @len: number of valid bytes in the input buffer 3151 * 3152 * Prepare a taskfile to modify caching information for the device. 3153 * 3154 * LOCKING: 3155 * None. 3156 */ 3157 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3158 const u8 *buf, int len) 3159 { 3160 struct ata_taskfile *tf = &qc->tf; 3161 struct ata_device *dev = qc->dev; 3162 char mpage[CACHE_MPAGE_LEN]; 3163 u8 wce; 3164 3165 /* 3166 * The first two bytes of def_cache_mpage are a header, so offsets 3167 * in mpage are off by 2 compared to buf. Same for len. 3168 */ 3169 3170 if (len != CACHE_MPAGE_LEN - 2) 3171 return -EINVAL; 3172 3173 wce = buf[0] & (1 << 2); 3174 3175 /* 3176 * Check that read-only bits are not modified. 3177 */ 3178 ata_msense_caching(dev->id, mpage, false); 3179 mpage[2] &= ~(1 << 2); 3180 mpage[2] |= wce; 3181 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3182 return -EINVAL; 3183 3184 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3185 tf->protocol = ATA_PROT_NODATA; 3186 tf->nsect = 0; 3187 tf->command = ATA_CMD_SET_FEATURES; 3188 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3189 return 0; 3190 } 3191 3192 /** 3193 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3194 * @qc: Storage for translated ATA taskfile 3195 * 3196 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3197 * Assume this is invoked for direct access devices (e.g. disks) only. 3198 * There should be no block descriptor for other device types. 3199 * 3200 * LOCKING: 3201 * spin_lock_irqsave(host lock) 3202 */ 3203 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3204 { 3205 struct scsi_cmnd *scmd = qc->scsicmd; 3206 const u8 *cdb = scmd->cmnd; 3207 const u8 *p; 3208 u8 pg, spg; 3209 unsigned six_byte, pg_len, hdr_len, bd_len; 3210 int len; 3211 3212 VPRINTK("ENTER\n"); 3213 3214 six_byte = (cdb[0] == MODE_SELECT); 3215 if (six_byte) { 3216 if (scmd->cmd_len < 5) 3217 goto invalid_fld; 3218 3219 len = cdb[4]; 3220 hdr_len = 4; 3221 } else { 3222 if (scmd->cmd_len < 9) 3223 goto invalid_fld; 3224 3225 len = (cdb[7] << 8) + cdb[8]; 3226 hdr_len = 8; 3227 } 3228 3229 /* We only support PF=1, SP=0. */ 3230 if ((cdb[1] & 0x11) != 0x10) 3231 goto invalid_fld; 3232 3233 /* Test early for possible overrun. */ 3234 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3235 goto invalid_param_len; 3236 3237 p = page_address(sg_page(scsi_sglist(scmd))); 3238 3239 /* Move past header and block descriptors. */ 3240 if (len < hdr_len) 3241 goto invalid_param_len; 3242 3243 if (six_byte) 3244 bd_len = p[3]; 3245 else 3246 bd_len = (p[6] << 8) + p[7]; 3247 3248 len -= hdr_len; 3249 p += hdr_len; 3250 if (len < bd_len) 3251 goto invalid_param_len; 3252 if (bd_len != 0 && bd_len != 8) 3253 goto invalid_param; 3254 3255 len -= bd_len; 3256 p += bd_len; 3257 if (len == 0) 3258 goto skip; 3259 3260 /* Parse both possible formats for the mode page headers. */ 3261 pg = p[0] & 0x3f; 3262 if (p[0] & 0x40) { 3263 if (len < 4) 3264 goto invalid_param_len; 3265 3266 spg = p[1]; 3267 pg_len = (p[2] << 8) | p[3]; 3268 p += 4; 3269 len -= 4; 3270 } else { 3271 if (len < 2) 3272 goto invalid_param_len; 3273 3274 spg = 0; 3275 pg_len = p[1]; 3276 p += 2; 3277 len -= 2; 3278 } 3279 3280 /* 3281 * No mode subpages supported (yet) but asking for _all_ 3282 * subpages may be valid 3283 */ 3284 if (spg && (spg != ALL_SUB_MPAGES)) 3285 goto invalid_param; 3286 if (pg_len > len) 3287 goto invalid_param_len; 3288 3289 switch (pg) { 3290 case CACHE_MPAGE: 3291 if (ata_mselect_caching(qc, p, pg_len) < 0) 3292 goto invalid_param; 3293 break; 3294 3295 default: /* invalid page code */ 3296 goto invalid_param; 3297 } 3298 3299 /* 3300 * Only one page has changeable data, so we only support setting one 3301 * page at a time. 3302 */ 3303 if (len > pg_len) 3304 goto invalid_param; 3305 3306 return 0; 3307 3308 invalid_fld: 3309 /* "Invalid field in CDB" */ 3310 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3311 return 1; 3312 3313 invalid_param: 3314 /* "Invalid field in parameter list" */ 3315 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3316 return 1; 3317 3318 invalid_param_len: 3319 /* "Parameter list length error" */ 3320 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3321 return 1; 3322 3323 skip: 3324 scmd->result = SAM_STAT_GOOD; 3325 return 1; 3326 } 3327 3328 /** 3329 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3330 * @dev: ATA device 3331 * @cmd: SCSI command opcode to consider 3332 * 3333 * Look up the SCSI command given, and determine whether the 3334 * SCSI command is to be translated or simulated. 3335 * 3336 * RETURNS: 3337 * Pointer to translation function if possible, %NULL if not. 3338 */ 3339 3340 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3341 { 3342 switch (cmd) { 3343 case READ_6: 3344 case READ_10: 3345 case READ_16: 3346 3347 case WRITE_6: 3348 case WRITE_10: 3349 case WRITE_16: 3350 return ata_scsi_rw_xlat; 3351 3352 case WRITE_SAME_16: 3353 return ata_scsi_write_same_xlat; 3354 3355 case SYNCHRONIZE_CACHE: 3356 if (ata_try_flush_cache(dev)) 3357 return ata_scsi_flush_xlat; 3358 break; 3359 3360 case VERIFY: 3361 case VERIFY_16: 3362 return ata_scsi_verify_xlat; 3363 3364 case ATA_12: 3365 case ATA_16: 3366 return ata_scsi_pass_thru; 3367 3368 case MODE_SELECT: 3369 case MODE_SELECT_10: 3370 return ata_scsi_mode_select_xlat; 3371 break; 3372 3373 case START_STOP: 3374 return ata_scsi_start_stop_xlat; 3375 } 3376 3377 return NULL; 3378 } 3379 3380 /** 3381 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3382 * @ap: ATA port to which the command was being sent 3383 * @cmd: SCSI command to dump 3384 * 3385 * Prints the contents of a SCSI command via printk(). 3386 */ 3387 3388 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3389 struct scsi_cmnd *cmd) 3390 { 3391 #ifdef ATA_DEBUG 3392 struct scsi_device *scsidev = cmd->device; 3393 u8 *scsicmd = cmd->cmnd; 3394 3395 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3396 ap->print_id, 3397 scsidev->channel, scsidev->id, scsidev->lun, 3398 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3399 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3400 scsicmd[8]); 3401 #endif 3402 } 3403 3404 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3405 struct ata_device *dev) 3406 { 3407 u8 scsi_op = scmd->cmnd[0]; 3408 ata_xlat_func_t xlat_func; 3409 int rc = 0; 3410 3411 if (dev->class == ATA_DEV_ATA) { 3412 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3413 goto bad_cdb_len; 3414 3415 xlat_func = ata_get_xlat_func(dev, scsi_op); 3416 } else { 3417 if (unlikely(!scmd->cmd_len)) 3418 goto bad_cdb_len; 3419 3420 xlat_func = NULL; 3421 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3422 /* relay SCSI command to ATAPI device */ 3423 int len = COMMAND_SIZE(scsi_op); 3424 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3425 goto bad_cdb_len; 3426 3427 xlat_func = atapi_xlat; 3428 } else { 3429 /* ATA_16 passthru, treat as an ATA command */ 3430 if (unlikely(scmd->cmd_len > 16)) 3431 goto bad_cdb_len; 3432 3433 xlat_func = ata_get_xlat_func(dev, scsi_op); 3434 } 3435 } 3436 3437 if (xlat_func) 3438 rc = ata_scsi_translate(dev, scmd, xlat_func); 3439 else 3440 ata_scsi_simulate(dev, scmd); 3441 3442 return rc; 3443 3444 bad_cdb_len: 3445 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3446 scmd->cmd_len, scsi_op, dev->cdb_len); 3447 scmd->result = DID_ERROR << 16; 3448 scmd->scsi_done(scmd); 3449 return 0; 3450 } 3451 3452 /** 3453 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3454 * @shost: SCSI host of command to be sent 3455 * @cmd: SCSI command to be sent 3456 * 3457 * In some cases, this function translates SCSI commands into 3458 * ATA taskfiles, and queues the taskfiles to be sent to 3459 * hardware. In other cases, this function simulates a 3460 * SCSI device by evaluating and responding to certain 3461 * SCSI commands. This creates the overall effect of 3462 * ATA and ATAPI devices appearing as SCSI devices. 3463 * 3464 * LOCKING: 3465 * ATA host lock 3466 * 3467 * RETURNS: 3468 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3469 * 0 otherwise. 3470 */ 3471 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3472 { 3473 struct ata_port *ap; 3474 struct ata_device *dev; 3475 struct scsi_device *scsidev = cmd->device; 3476 int rc = 0; 3477 unsigned long irq_flags; 3478 3479 ap = ata_shost_to_port(shost); 3480 3481 spin_lock_irqsave(ap->lock, irq_flags); 3482 3483 ata_scsi_dump_cdb(ap, cmd); 3484 3485 dev = ata_scsi_find_dev(ap, scsidev); 3486 if (likely(dev)) 3487 rc = __ata_scsi_queuecmd(cmd, dev); 3488 else { 3489 cmd->result = (DID_BAD_TARGET << 16); 3490 cmd->scsi_done(cmd); 3491 } 3492 3493 spin_unlock_irqrestore(ap->lock, irq_flags); 3494 3495 return rc; 3496 } 3497 3498 /** 3499 * ata_scsi_simulate - simulate SCSI command on ATA device 3500 * @dev: the target device 3501 * @cmd: SCSI command being sent to device. 3502 * 3503 * Interprets and directly executes a select list of SCSI commands 3504 * that can be handled internally. 3505 * 3506 * LOCKING: 3507 * spin_lock_irqsave(host lock) 3508 */ 3509 3510 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3511 { 3512 struct ata_scsi_args args; 3513 const u8 *scsicmd = cmd->cmnd; 3514 u8 tmp8; 3515 3516 args.dev = dev; 3517 args.id = dev->id; 3518 args.cmd = cmd; 3519 args.done = cmd->scsi_done; 3520 3521 switch(scsicmd[0]) { 3522 /* TODO: worth improving? */ 3523 case FORMAT_UNIT: 3524 ata_scsi_invalid_field(cmd); 3525 break; 3526 3527 case INQUIRY: 3528 if (scsicmd[1] & 2) /* is CmdDt set? */ 3529 ata_scsi_invalid_field(cmd); 3530 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3531 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3532 else switch (scsicmd[2]) { 3533 case 0x00: 3534 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3535 break; 3536 case 0x80: 3537 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3538 break; 3539 case 0x83: 3540 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3541 break; 3542 case 0x89: 3543 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3544 break; 3545 case 0xb0: 3546 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3547 break; 3548 case 0xb1: 3549 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3550 break; 3551 case 0xb2: 3552 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3553 break; 3554 default: 3555 ata_scsi_invalid_field(cmd); 3556 break; 3557 } 3558 break; 3559 3560 case MODE_SENSE: 3561 case MODE_SENSE_10: 3562 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3563 break; 3564 3565 case READ_CAPACITY: 3566 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3567 break; 3568 3569 case SERVICE_ACTION_IN: 3570 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3571 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3572 else 3573 ata_scsi_invalid_field(cmd); 3574 break; 3575 3576 case REPORT_LUNS: 3577 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3578 break; 3579 3580 case REQUEST_SENSE: 3581 ata_scsi_set_sense(cmd, 0, 0, 0); 3582 cmd->result = (DRIVER_SENSE << 24); 3583 cmd->scsi_done(cmd); 3584 break; 3585 3586 /* if we reach this, then writeback caching is disabled, 3587 * turning this into a no-op. 3588 */ 3589 case SYNCHRONIZE_CACHE: 3590 /* fall through */ 3591 3592 /* no-op's, complete with success */ 3593 case REZERO_UNIT: 3594 case SEEK_6: 3595 case SEEK_10: 3596 case TEST_UNIT_READY: 3597 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3598 break; 3599 3600 case SEND_DIAGNOSTIC: 3601 tmp8 = scsicmd[1] & ~(1 << 3); 3602 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3603 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3604 else 3605 ata_scsi_invalid_field(cmd); 3606 break; 3607 3608 /* all other commands */ 3609 default: 3610 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3611 /* "Invalid command operation code" */ 3612 cmd->scsi_done(cmd); 3613 break; 3614 } 3615 } 3616 3617 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3618 { 3619 int i, rc; 3620 3621 for (i = 0; i < host->n_ports; i++) { 3622 struct ata_port *ap = host->ports[i]; 3623 struct Scsi_Host *shost; 3624 3625 rc = -ENOMEM; 3626 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3627 if (!shost) 3628 goto err_alloc; 3629 3630 shost->eh_noresume = 1; 3631 *(struct ata_port **)&shost->hostdata[0] = ap; 3632 ap->scsi_host = shost; 3633 3634 shost->transportt = ata_scsi_transport_template; 3635 shost->unique_id = ap->print_id; 3636 shost->max_id = 16; 3637 shost->max_lun = 1; 3638 shost->max_channel = 1; 3639 shost->max_cmd_len = 16; 3640 shost->no_write_same = 1; 3641 3642 /* Schedule policy is determined by ->qc_defer() 3643 * callback and it needs to see every deferred qc. 3644 * Set host_blocked to 1 to prevent SCSI midlayer from 3645 * automatically deferring requests. 3646 */ 3647 shost->max_host_blocked = 1; 3648 3649 rc = scsi_add_host_with_dma(ap->scsi_host, 3650 &ap->tdev, ap->host->dev); 3651 if (rc) 3652 goto err_add; 3653 } 3654 3655 return 0; 3656 3657 err_add: 3658 scsi_host_put(host->ports[i]->scsi_host); 3659 err_alloc: 3660 while (--i >= 0) { 3661 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3662 3663 scsi_remove_host(shost); 3664 scsi_host_put(shost); 3665 } 3666 return rc; 3667 } 3668 3669 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3670 { 3671 int tries = 5; 3672 struct ata_device *last_failed_dev = NULL; 3673 struct ata_link *link; 3674 struct ata_device *dev; 3675 3676 repeat: 3677 ata_for_each_link(link, ap, EDGE) { 3678 ata_for_each_dev(dev, link, ENABLED) { 3679 struct scsi_device *sdev; 3680 int channel = 0, id = 0; 3681 3682 if (dev->sdev) 3683 continue; 3684 3685 if (ata_is_host_link(link)) 3686 id = dev->devno; 3687 else 3688 channel = link->pmp; 3689 3690 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3691 NULL); 3692 if (!IS_ERR(sdev)) { 3693 dev->sdev = sdev; 3694 scsi_device_put(sdev); 3695 } else { 3696 dev->sdev = NULL; 3697 } 3698 } 3699 } 3700 3701 /* If we scanned while EH was in progress or allocation 3702 * failure occurred, scan would have failed silently. Check 3703 * whether all devices are attached. 3704 */ 3705 ata_for_each_link(link, ap, EDGE) { 3706 ata_for_each_dev(dev, link, ENABLED) { 3707 if (!dev->sdev) 3708 goto exit_loop; 3709 } 3710 } 3711 exit_loop: 3712 if (!link) 3713 return; 3714 3715 /* we're missing some SCSI devices */ 3716 if (sync) { 3717 /* If caller requested synchrnous scan && we've made 3718 * any progress, sleep briefly and repeat. 3719 */ 3720 if (dev != last_failed_dev) { 3721 msleep(100); 3722 last_failed_dev = dev; 3723 goto repeat; 3724 } 3725 3726 /* We might be failing to detect boot device, give it 3727 * a few more chances. 3728 */ 3729 if (--tries) { 3730 msleep(100); 3731 goto repeat; 3732 } 3733 3734 ata_port_err(ap, 3735 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3736 } 3737 3738 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3739 round_jiffies_relative(HZ)); 3740 } 3741 3742 /** 3743 * ata_scsi_offline_dev - offline attached SCSI device 3744 * @dev: ATA device to offline attached SCSI device for 3745 * 3746 * This function is called from ata_eh_hotplug() and responsible 3747 * for taking the SCSI device attached to @dev offline. This 3748 * function is called with host lock which protects dev->sdev 3749 * against clearing. 3750 * 3751 * LOCKING: 3752 * spin_lock_irqsave(host lock) 3753 * 3754 * RETURNS: 3755 * 1 if attached SCSI device exists, 0 otherwise. 3756 */ 3757 int ata_scsi_offline_dev(struct ata_device *dev) 3758 { 3759 if (dev->sdev) { 3760 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3761 return 1; 3762 } 3763 return 0; 3764 } 3765 3766 /** 3767 * ata_scsi_remove_dev - remove attached SCSI device 3768 * @dev: ATA device to remove attached SCSI device for 3769 * 3770 * This function is called from ata_eh_scsi_hotplug() and 3771 * responsible for removing the SCSI device attached to @dev. 3772 * 3773 * LOCKING: 3774 * Kernel thread context (may sleep). 3775 */ 3776 static void ata_scsi_remove_dev(struct ata_device *dev) 3777 { 3778 struct ata_port *ap = dev->link->ap; 3779 struct scsi_device *sdev; 3780 unsigned long flags; 3781 3782 /* Alas, we need to grab scan_mutex to ensure SCSI device 3783 * state doesn't change underneath us and thus 3784 * scsi_device_get() always succeeds. The mutex locking can 3785 * be removed if there is __scsi_device_get() interface which 3786 * increments reference counts regardless of device state. 3787 */ 3788 mutex_lock(&ap->scsi_host->scan_mutex); 3789 spin_lock_irqsave(ap->lock, flags); 3790 3791 /* clearing dev->sdev is protected by host lock */ 3792 sdev = dev->sdev; 3793 dev->sdev = NULL; 3794 3795 if (sdev) { 3796 /* If user initiated unplug races with us, sdev can go 3797 * away underneath us after the host lock and 3798 * scan_mutex are released. Hold onto it. 3799 */ 3800 if (scsi_device_get(sdev) == 0) { 3801 /* The following ensures the attached sdev is 3802 * offline on return from ata_scsi_offline_dev() 3803 * regardless it wins or loses the race 3804 * against this function. 3805 */ 3806 scsi_device_set_state(sdev, SDEV_OFFLINE); 3807 } else { 3808 WARN_ON(1); 3809 sdev = NULL; 3810 } 3811 } 3812 3813 spin_unlock_irqrestore(ap->lock, flags); 3814 mutex_unlock(&ap->scsi_host->scan_mutex); 3815 3816 if (sdev) { 3817 ata_dev_info(dev, "detaching (SCSI %s)\n", 3818 dev_name(&sdev->sdev_gendev)); 3819 3820 scsi_remove_device(sdev); 3821 scsi_device_put(sdev); 3822 } 3823 } 3824 3825 static void ata_scsi_handle_link_detach(struct ata_link *link) 3826 { 3827 struct ata_port *ap = link->ap; 3828 struct ata_device *dev; 3829 3830 ata_for_each_dev(dev, link, ALL) { 3831 unsigned long flags; 3832 3833 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3834 continue; 3835 3836 spin_lock_irqsave(ap->lock, flags); 3837 dev->flags &= ~ATA_DFLAG_DETACHED; 3838 spin_unlock_irqrestore(ap->lock, flags); 3839 3840 if (zpodd_dev_enabled(dev)) 3841 zpodd_exit(dev); 3842 3843 ata_scsi_remove_dev(dev); 3844 } 3845 } 3846 3847 /** 3848 * ata_scsi_media_change_notify - send media change event 3849 * @dev: Pointer to the disk device with media change event 3850 * 3851 * Tell the block layer to send a media change notification 3852 * event. 3853 * 3854 * LOCKING: 3855 * spin_lock_irqsave(host lock) 3856 */ 3857 void ata_scsi_media_change_notify(struct ata_device *dev) 3858 { 3859 if (dev->sdev) 3860 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3861 GFP_ATOMIC); 3862 } 3863 3864 /** 3865 * ata_scsi_hotplug - SCSI part of hotplug 3866 * @work: Pointer to ATA port to perform SCSI hotplug on 3867 * 3868 * Perform SCSI part of hotplug. It's executed from a separate 3869 * workqueue after EH completes. This is necessary because SCSI 3870 * hot plugging requires working EH and hot unplugging is 3871 * synchronized with hot plugging with a mutex. 3872 * 3873 * LOCKING: 3874 * Kernel thread context (may sleep). 3875 */ 3876 void ata_scsi_hotplug(struct work_struct *work) 3877 { 3878 struct ata_port *ap = 3879 container_of(work, struct ata_port, hotplug_task.work); 3880 int i; 3881 3882 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3883 DPRINTK("ENTER/EXIT - unloading\n"); 3884 return; 3885 } 3886 3887 /* 3888 * XXX - UGLY HACK 3889 * 3890 * The block layer suspend/resume path is fundamentally broken due 3891 * to freezable kthreads and workqueue and may deadlock if a block 3892 * device gets removed while resume is in progress. I don't know 3893 * what the solution is short of removing freezable kthreads and 3894 * workqueues altogether. 3895 * 3896 * The following is an ugly hack to avoid kicking off device 3897 * removal while freezer is active. This is a joke but does avoid 3898 * this particular deadlock scenario. 3899 * 3900 * https://bugzilla.kernel.org/show_bug.cgi?id=62801 3901 * http://marc.info/?l=linux-kernel&m=138695698516487 3902 */ 3903 #ifdef CONFIG_FREEZER 3904 while (pm_freezing) 3905 msleep(10); 3906 #endif 3907 3908 DPRINTK("ENTER\n"); 3909 mutex_lock(&ap->scsi_scan_mutex); 3910 3911 /* Unplug detached devices. We cannot use link iterator here 3912 * because PMP links have to be scanned even if PMP is 3913 * currently not attached. Iterate manually. 3914 */ 3915 ata_scsi_handle_link_detach(&ap->link); 3916 if (ap->pmp_link) 3917 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3918 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3919 3920 /* scan for new ones */ 3921 ata_scsi_scan_host(ap, 0); 3922 3923 mutex_unlock(&ap->scsi_scan_mutex); 3924 DPRINTK("EXIT\n"); 3925 } 3926 3927 /** 3928 * ata_scsi_user_scan - indication for user-initiated bus scan 3929 * @shost: SCSI host to scan 3930 * @channel: Channel to scan 3931 * @id: ID to scan 3932 * @lun: LUN to scan 3933 * 3934 * This function is called when user explicitly requests bus 3935 * scan. Set probe pending flag and invoke EH. 3936 * 3937 * LOCKING: 3938 * SCSI layer (we don't care) 3939 * 3940 * RETURNS: 3941 * Zero. 3942 */ 3943 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3944 unsigned int id, unsigned int lun) 3945 { 3946 struct ata_port *ap = ata_shost_to_port(shost); 3947 unsigned long flags; 3948 int devno, rc = 0; 3949 3950 if (!ap->ops->error_handler) 3951 return -EOPNOTSUPP; 3952 3953 if (lun != SCAN_WILD_CARD && lun) 3954 return -EINVAL; 3955 3956 if (!sata_pmp_attached(ap)) { 3957 if (channel != SCAN_WILD_CARD && channel) 3958 return -EINVAL; 3959 devno = id; 3960 } else { 3961 if (id != SCAN_WILD_CARD && id) 3962 return -EINVAL; 3963 devno = channel; 3964 } 3965 3966 spin_lock_irqsave(ap->lock, flags); 3967 3968 if (devno == SCAN_WILD_CARD) { 3969 struct ata_link *link; 3970 3971 ata_for_each_link(link, ap, EDGE) { 3972 struct ata_eh_info *ehi = &link->eh_info; 3973 ehi->probe_mask |= ATA_ALL_DEVICES; 3974 ehi->action |= ATA_EH_RESET; 3975 } 3976 } else { 3977 struct ata_device *dev = ata_find_dev(ap, devno); 3978 3979 if (dev) { 3980 struct ata_eh_info *ehi = &dev->link->eh_info; 3981 ehi->probe_mask |= 1 << dev->devno; 3982 ehi->action |= ATA_EH_RESET; 3983 } else 3984 rc = -EINVAL; 3985 } 3986 3987 if (rc == 0) { 3988 ata_port_schedule_eh(ap); 3989 spin_unlock_irqrestore(ap->lock, flags); 3990 ata_port_wait_eh(ap); 3991 } else 3992 spin_unlock_irqrestore(ap->lock, flags); 3993 3994 return rc; 3995 } 3996 3997 /** 3998 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3999 * @work: Pointer to ATA port to perform scsi_rescan_device() 4000 * 4001 * After ATA pass thru (SAT) commands are executed successfully, 4002 * libata need to propagate the changes to SCSI layer. 4003 * 4004 * LOCKING: 4005 * Kernel thread context (may sleep). 4006 */ 4007 void ata_scsi_dev_rescan(struct work_struct *work) 4008 { 4009 struct ata_port *ap = 4010 container_of(work, struct ata_port, scsi_rescan_task); 4011 struct ata_link *link; 4012 struct ata_device *dev; 4013 unsigned long flags; 4014 4015 mutex_lock(&ap->scsi_scan_mutex); 4016 spin_lock_irqsave(ap->lock, flags); 4017 4018 ata_for_each_link(link, ap, EDGE) { 4019 ata_for_each_dev(dev, link, ENABLED) { 4020 struct scsi_device *sdev = dev->sdev; 4021 4022 if (!sdev) 4023 continue; 4024 if (scsi_device_get(sdev)) 4025 continue; 4026 4027 spin_unlock_irqrestore(ap->lock, flags); 4028 scsi_rescan_device(&(sdev->sdev_gendev)); 4029 scsi_device_put(sdev); 4030 spin_lock_irqsave(ap->lock, flags); 4031 } 4032 } 4033 4034 spin_unlock_irqrestore(ap->lock, flags); 4035 mutex_unlock(&ap->scsi_scan_mutex); 4036 } 4037 4038 /** 4039 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4040 * @host: ATA host container for all SAS ports 4041 * @port_info: Information from low-level host driver 4042 * @shost: SCSI host that the scsi device is attached to 4043 * 4044 * LOCKING: 4045 * PCI/etc. bus probe sem. 4046 * 4047 * RETURNS: 4048 * ata_port pointer on success / NULL on failure. 4049 */ 4050 4051 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4052 struct ata_port_info *port_info, 4053 struct Scsi_Host *shost) 4054 { 4055 struct ata_port *ap; 4056 4057 ap = ata_port_alloc(host); 4058 if (!ap) 4059 return NULL; 4060 4061 ap->port_no = 0; 4062 ap->lock = &host->lock; 4063 ap->pio_mask = port_info->pio_mask; 4064 ap->mwdma_mask = port_info->mwdma_mask; 4065 ap->udma_mask = port_info->udma_mask; 4066 ap->flags |= port_info->flags; 4067 ap->ops = port_info->port_ops; 4068 ap->cbl = ATA_CBL_SATA; 4069 4070 return ap; 4071 } 4072 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4073 4074 /** 4075 * ata_sas_port_start - Set port up for dma. 4076 * @ap: Port to initialize 4077 * 4078 * Called just after data structures for each port are 4079 * initialized. 4080 * 4081 * May be used as the port_start() entry in ata_port_operations. 4082 * 4083 * LOCKING: 4084 * Inherited from caller. 4085 */ 4086 int ata_sas_port_start(struct ata_port *ap) 4087 { 4088 /* 4089 * the port is marked as frozen at allocation time, but if we don't 4090 * have new eh, we won't thaw it 4091 */ 4092 if (!ap->ops->error_handler) 4093 ap->pflags &= ~ATA_PFLAG_FROZEN; 4094 return 0; 4095 } 4096 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4097 4098 /** 4099 * ata_port_stop - Undo ata_sas_port_start() 4100 * @ap: Port to shut down 4101 * 4102 * May be used as the port_stop() entry in ata_port_operations. 4103 * 4104 * LOCKING: 4105 * Inherited from caller. 4106 */ 4107 4108 void ata_sas_port_stop(struct ata_port *ap) 4109 { 4110 } 4111 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4112 4113 /** 4114 * ata_sas_async_probe - simply schedule probing and return 4115 * @ap: Port to probe 4116 * 4117 * For batch scheduling of probe for sas attached ata devices, assumes 4118 * the port has already been through ata_sas_port_init() 4119 */ 4120 void ata_sas_async_probe(struct ata_port *ap) 4121 { 4122 __ata_port_probe(ap); 4123 } 4124 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4125 4126 int ata_sas_sync_probe(struct ata_port *ap) 4127 { 4128 return ata_port_probe(ap); 4129 } 4130 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4131 4132 4133 /** 4134 * ata_sas_port_init - Initialize a SATA device 4135 * @ap: SATA port to initialize 4136 * 4137 * LOCKING: 4138 * PCI/etc. bus probe sem. 4139 * 4140 * RETURNS: 4141 * Zero on success, non-zero on error. 4142 */ 4143 4144 int ata_sas_port_init(struct ata_port *ap) 4145 { 4146 int rc = ap->ops->port_start(ap); 4147 4148 if (rc) 4149 return rc; 4150 ap->print_id = atomic_inc_return(&ata_print_id); 4151 return 0; 4152 } 4153 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4154 4155 /** 4156 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4157 * @ap: SATA port to destroy 4158 * 4159 */ 4160 4161 void ata_sas_port_destroy(struct ata_port *ap) 4162 { 4163 if (ap->ops->port_stop) 4164 ap->ops->port_stop(ap); 4165 kfree(ap); 4166 } 4167 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4168 4169 /** 4170 * ata_sas_slave_configure - Default slave_config routine for libata devices 4171 * @sdev: SCSI device to configure 4172 * @ap: ATA port to which SCSI device is attached 4173 * 4174 * RETURNS: 4175 * Zero. 4176 */ 4177 4178 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4179 { 4180 ata_scsi_sdev_config(sdev); 4181 ata_scsi_dev_config(sdev, ap->link.device); 4182 return 0; 4183 } 4184 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4185 4186 /** 4187 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4188 * @cmd: SCSI command to be sent 4189 * @ap: ATA port to which the command is being sent 4190 * 4191 * RETURNS: 4192 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4193 * 0 otherwise. 4194 */ 4195 4196 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4197 { 4198 int rc = 0; 4199 4200 ata_scsi_dump_cdb(ap, cmd); 4201 4202 if (likely(ata_dev_enabled(ap->link.device))) 4203 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4204 else { 4205 cmd->result = (DID_BAD_TARGET << 16); 4206 cmd->scsi_done(cmd); 4207 } 4208 return rc; 4209 } 4210 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4211