1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * libata-scsi.c - helper library for ATA 4 * 5 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 6 * Copyright 2003-2004 Jeff Garzik 7 * 8 * libata documentation is available via 'make {ps|pdf}docs', 9 * as Documentation/driver-api/libata.rst 10 * 11 * Hardware documentation available from 12 * - http://www.t10.org/ 13 * - http://www.t13.org/ 14 */ 15 16 #include <linux/compat.h> 17 #include <linux/slab.h> 18 #include <linux/kernel.h> 19 #include <linux/blkdev.h> 20 #include <linux/spinlock.h> 21 #include <linux/export.h> 22 #include <scsi/scsi.h> 23 #include <scsi/scsi_host.h> 24 #include <scsi/scsi_cmnd.h> 25 #include <scsi/scsi_eh.h> 26 #include <scsi/scsi_device.h> 27 #include <scsi/scsi_tcq.h> 28 #include <scsi/scsi_transport.h> 29 #include <linux/libata.h> 30 #include <linux/hdreg.h> 31 #include <linux/uaccess.h> 32 #include <linux/suspend.h> 33 #include <asm/unaligned.h> 34 #include <linux/ioprio.h> 35 #include <linux/of.h> 36 37 #include "libata.h" 38 #include "libata-transport.h" 39 40 #define ATA_SCSI_RBUF_SIZE 576 41 42 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 43 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 44 45 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 46 47 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 48 const struct scsi_device *scsidev); 49 50 #define RW_RECOVERY_MPAGE 0x1 51 #define RW_RECOVERY_MPAGE_LEN 12 52 #define CACHE_MPAGE 0x8 53 #define CACHE_MPAGE_LEN 20 54 #define CONTROL_MPAGE 0xa 55 #define CONTROL_MPAGE_LEN 12 56 #define ALL_MPAGES 0x3f 57 #define ALL_SUB_MPAGES 0xff 58 59 60 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 61 RW_RECOVERY_MPAGE, 62 RW_RECOVERY_MPAGE_LEN - 2, 63 (1 << 7), /* AWRE */ 64 0, /* read retry count */ 65 0, 0, 0, 0, 66 0, /* write retry count */ 67 0, 0, 0 68 }; 69 70 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 71 CACHE_MPAGE, 72 CACHE_MPAGE_LEN - 2, 73 0, /* contains WCE, needs to be 0 for logic */ 74 0, 0, 0, 0, 0, 0, 0, 0, 0, 75 0, /* contains DRA, needs to be 0 for logic */ 76 0, 0, 0, 0, 0, 0, 0 77 }; 78 79 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 80 CONTROL_MPAGE, 81 CONTROL_MPAGE_LEN - 2, 82 2, /* DSENSE=0, GLTSD=1 */ 83 0, /* [QAM+QERR may be 1, see 05-359r1] */ 84 0, 0, 0, 0, 0xff, 0xff, 85 0, 30 /* extended self test time, see 05-359r1 */ 86 }; 87 88 static ssize_t ata_scsi_park_show(struct device *device, 89 struct device_attribute *attr, char *buf) 90 { 91 struct scsi_device *sdev = to_scsi_device(device); 92 struct ata_port *ap; 93 struct ata_link *link; 94 struct ata_device *dev; 95 unsigned long now; 96 unsigned int msecs; 97 int rc = 0; 98 99 ap = ata_shost_to_port(sdev->host); 100 101 spin_lock_irq(ap->lock); 102 dev = ata_scsi_find_dev(ap, sdev); 103 if (!dev) { 104 rc = -ENODEV; 105 goto unlock; 106 } 107 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 108 rc = -EOPNOTSUPP; 109 goto unlock; 110 } 111 112 link = dev->link; 113 now = jiffies; 114 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 115 link->eh_context.unloaded_mask & (1 << dev->devno) && 116 time_after(dev->unpark_deadline, now)) 117 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 118 else 119 msecs = 0; 120 121 unlock: 122 spin_unlock_irq(ap->lock); 123 124 return rc ? rc : sysfs_emit(buf, "%u\n", msecs); 125 } 126 127 static ssize_t ata_scsi_park_store(struct device *device, 128 struct device_attribute *attr, 129 const char *buf, size_t len) 130 { 131 struct scsi_device *sdev = to_scsi_device(device); 132 struct ata_port *ap; 133 struct ata_device *dev; 134 long int input; 135 unsigned long flags; 136 int rc; 137 138 rc = kstrtol(buf, 10, &input); 139 if (rc) 140 return rc; 141 if (input < -2) 142 return -EINVAL; 143 if (input > ATA_TMOUT_MAX_PARK) { 144 rc = -EOVERFLOW; 145 input = ATA_TMOUT_MAX_PARK; 146 } 147 148 ap = ata_shost_to_port(sdev->host); 149 150 spin_lock_irqsave(ap->lock, flags); 151 dev = ata_scsi_find_dev(ap, sdev); 152 if (unlikely(!dev)) { 153 rc = -ENODEV; 154 goto unlock; 155 } 156 if (dev->class != ATA_DEV_ATA && 157 dev->class != ATA_DEV_ZAC) { 158 rc = -EOPNOTSUPP; 159 goto unlock; 160 } 161 162 if (input >= 0) { 163 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 164 rc = -EOPNOTSUPP; 165 goto unlock; 166 } 167 168 dev->unpark_deadline = ata_deadline(jiffies, input); 169 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 170 ata_port_schedule_eh(ap); 171 complete(&ap->park_req_pending); 172 } else { 173 switch (input) { 174 case -1: 175 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 176 break; 177 case -2: 178 dev->flags |= ATA_DFLAG_NO_UNLOAD; 179 break; 180 } 181 } 182 unlock: 183 spin_unlock_irqrestore(ap->lock, flags); 184 185 return rc ? rc : len; 186 } 187 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 188 ata_scsi_park_show, ata_scsi_park_store); 189 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 190 191 bool ata_scsi_sense_is_valid(u8 sk, u8 asc, u8 ascq) 192 { 193 /* 194 * If sk == NO_SENSE, and asc + ascq == NO ADDITIONAL SENSE INFORMATION, 195 * then there is no sense data to add. 196 */ 197 if (sk == 0 && asc == 0 && ascq == 0) 198 return false; 199 200 /* If sk > COMPLETED, sense data is bogus. */ 201 if (sk > COMPLETED) 202 return false; 203 204 return true; 205 } 206 207 void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd, 208 u8 sk, u8 asc, u8 ascq) 209 { 210 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 211 212 if (!cmd) 213 return; 214 215 scsi_build_sense(cmd, d_sense, sk, asc, ascq); 216 } 217 218 void ata_scsi_set_sense_information(struct ata_device *dev, 219 struct scsi_cmnd *cmd, 220 const struct ata_taskfile *tf) 221 { 222 u64 information; 223 224 if (!cmd) 225 return; 226 227 information = ata_tf_read_block(tf, dev); 228 if (information == U64_MAX) 229 return; 230 231 scsi_set_sense_information(cmd->sense_buffer, 232 SCSI_SENSE_BUFFERSIZE, information); 233 } 234 235 static void ata_scsi_set_invalid_field(struct ata_device *dev, 236 struct scsi_cmnd *cmd, u16 field, u8 bit) 237 { 238 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0); 239 /* "Invalid field in CDB" */ 240 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 241 field, bit, 1); 242 } 243 244 static void ata_scsi_set_invalid_parameter(struct ata_device *dev, 245 struct scsi_cmnd *cmd, u16 field) 246 { 247 /* "Invalid field in parameter list" */ 248 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0); 249 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 250 field, 0xff, 0); 251 } 252 253 static struct attribute *ata_common_sdev_attrs[] = { 254 &dev_attr_unload_heads.attr, 255 NULL 256 }; 257 258 static const struct attribute_group ata_common_sdev_attr_group = { 259 .attrs = ata_common_sdev_attrs 260 }; 261 262 const struct attribute_group *ata_common_sdev_groups[] = { 263 &ata_common_sdev_attr_group, 264 NULL 265 }; 266 EXPORT_SYMBOL_GPL(ata_common_sdev_groups); 267 268 /** 269 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 270 * @sdev: SCSI device for which BIOS geometry is to be determined 271 * @bdev: block device associated with @sdev 272 * @capacity: capacity of SCSI device 273 * @geom: location to which geometry will be output 274 * 275 * Generic bios head/sector/cylinder calculator 276 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 277 * mapping. Some situations may arise where the disk is not 278 * bootable if this is not used. 279 * 280 * LOCKING: 281 * Defined by the SCSI layer. We don't really care. 282 * 283 * RETURNS: 284 * Zero. 285 */ 286 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 287 sector_t capacity, int geom[]) 288 { 289 geom[0] = 255; 290 geom[1] = 63; 291 sector_div(capacity, 255*63); 292 geom[2] = capacity; 293 294 return 0; 295 } 296 EXPORT_SYMBOL_GPL(ata_std_bios_param); 297 298 /** 299 * ata_scsi_unlock_native_capacity - unlock native capacity 300 * @sdev: SCSI device to adjust device capacity for 301 * 302 * This function is called if a partition on @sdev extends beyond 303 * the end of the device. It requests EH to unlock HPA. 304 * 305 * LOCKING: 306 * Defined by the SCSI layer. Might sleep. 307 */ 308 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 309 { 310 struct ata_port *ap = ata_shost_to_port(sdev->host); 311 struct ata_device *dev; 312 unsigned long flags; 313 314 spin_lock_irqsave(ap->lock, flags); 315 316 dev = ata_scsi_find_dev(ap, sdev); 317 if (dev && dev->n_sectors < dev->n_native_sectors) { 318 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 319 dev->link->eh_info.action |= ATA_EH_RESET; 320 ata_port_schedule_eh(ap); 321 } 322 323 spin_unlock_irqrestore(ap->lock, flags); 324 ata_port_wait_eh(ap); 325 } 326 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity); 327 328 /** 329 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 330 * @ap: target port 331 * @sdev: SCSI device to get identify data for 332 * @arg: User buffer area for identify data 333 * 334 * LOCKING: 335 * Defined by the SCSI layer. We don't really care. 336 * 337 * RETURNS: 338 * Zero on success, negative errno on error. 339 */ 340 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 341 void __user *arg) 342 { 343 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 344 u16 __user *dst = arg; 345 char buf[40]; 346 347 if (!dev) 348 return -ENOMSG; 349 350 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 351 return -EFAULT; 352 353 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 354 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 355 return -EFAULT; 356 357 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 358 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 359 return -EFAULT; 360 361 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 362 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 363 return -EFAULT; 364 365 return 0; 366 } 367 368 /** 369 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 370 * @scsidev: Device to which we are issuing command 371 * @arg: User provided data for issuing command 372 * 373 * LOCKING: 374 * Defined by the SCSI layer. We don't really care. 375 * 376 * RETURNS: 377 * Zero on success, negative errno on error. 378 */ 379 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 380 { 381 int rc = 0; 382 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 383 u8 scsi_cmd[MAX_COMMAND_SIZE]; 384 u8 args[4], *argbuf = NULL; 385 int argsize = 0; 386 struct scsi_sense_hdr sshdr; 387 const struct scsi_exec_args exec_args = { 388 .sshdr = &sshdr, 389 .sense = sensebuf, 390 .sense_len = sizeof(sensebuf), 391 }; 392 int cmd_result; 393 394 if (arg == NULL) 395 return -EINVAL; 396 397 if (copy_from_user(args, arg, sizeof(args))) 398 return -EFAULT; 399 400 memset(sensebuf, 0, sizeof(sensebuf)); 401 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 402 403 if (args[3]) { 404 argsize = ATA_SECT_SIZE * args[3]; 405 argbuf = kmalloc(argsize, GFP_KERNEL); 406 if (argbuf == NULL) { 407 rc = -ENOMEM; 408 goto error; 409 } 410 411 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 412 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 413 block count in sector count field */ 414 } else { 415 scsi_cmd[1] = (3 << 1); /* Non-data */ 416 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 417 } 418 419 scsi_cmd[0] = ATA_16; 420 421 scsi_cmd[4] = args[2]; 422 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 423 scsi_cmd[6] = args[3]; 424 scsi_cmd[8] = args[1]; 425 scsi_cmd[10] = ATA_SMART_LBAM_PASS; 426 scsi_cmd[12] = ATA_SMART_LBAH_PASS; 427 } else { 428 scsi_cmd[6] = args[1]; 429 } 430 scsi_cmd[14] = args[0]; 431 432 /* Good values for timeout and retries? Values below 433 from scsi_ioctl_send_command() for default case... */ 434 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, argbuf, 435 argsize, 10 * HZ, 5, &exec_args); 436 if (cmd_result < 0) { 437 rc = cmd_result; 438 goto error; 439 } 440 if (scsi_sense_valid(&sshdr)) {/* sense data available */ 441 u8 *desc = sensebuf + 8; 442 443 /* If we set cc then ATA pass-through will cause a 444 * check condition even if no error. Filter that. */ 445 if (scsi_status_is_check_condition(cmd_result)) { 446 if (sshdr.sense_key == RECOVERED_ERROR && 447 sshdr.asc == 0 && sshdr.ascq == 0x1d) 448 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 449 } 450 451 /* Send userspace a few ATA registers (same as drivers/ide) */ 452 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 453 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 454 args[0] = desc[13]; /* status */ 455 args[1] = desc[3]; /* error */ 456 args[2] = desc[5]; /* sector count (0:7) */ 457 if (copy_to_user(arg, args, sizeof(args))) 458 rc = -EFAULT; 459 } 460 } 461 462 463 if (cmd_result) { 464 rc = -EIO; 465 goto error; 466 } 467 468 if ((argbuf) 469 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 470 rc = -EFAULT; 471 error: 472 kfree(argbuf); 473 return rc; 474 } 475 476 /** 477 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 478 * @scsidev: Device to which we are issuing command 479 * @arg: User provided data for issuing command 480 * 481 * LOCKING: 482 * Defined by the SCSI layer. We don't really care. 483 * 484 * RETURNS: 485 * Zero on success, negative errno on error. 486 */ 487 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 488 { 489 int rc = 0; 490 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 491 u8 scsi_cmd[MAX_COMMAND_SIZE]; 492 u8 args[7]; 493 struct scsi_sense_hdr sshdr; 494 int cmd_result; 495 const struct scsi_exec_args exec_args = { 496 .sshdr = &sshdr, 497 .sense = sensebuf, 498 .sense_len = sizeof(sensebuf), 499 }; 500 501 if (arg == NULL) 502 return -EINVAL; 503 504 if (copy_from_user(args, arg, sizeof(args))) 505 return -EFAULT; 506 507 memset(sensebuf, 0, sizeof(sensebuf)); 508 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 509 scsi_cmd[0] = ATA_16; 510 scsi_cmd[1] = (3 << 1); /* Non-data */ 511 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 512 scsi_cmd[4] = args[1]; 513 scsi_cmd[6] = args[2]; 514 scsi_cmd[8] = args[3]; 515 scsi_cmd[10] = args[4]; 516 scsi_cmd[12] = args[5]; 517 scsi_cmd[13] = args[6] & 0x4f; 518 scsi_cmd[14] = args[0]; 519 520 /* Good values for timeout and retries? Values below 521 from scsi_ioctl_send_command() for default case... */ 522 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, NULL, 523 0, 10 * HZ, 5, &exec_args); 524 if (cmd_result < 0) { 525 rc = cmd_result; 526 goto error; 527 } 528 if (scsi_sense_valid(&sshdr)) {/* sense data available */ 529 u8 *desc = sensebuf + 8; 530 531 /* If we set cc then ATA pass-through will cause a 532 * check condition even if no error. Filter that. */ 533 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 534 if (sshdr.sense_key == RECOVERED_ERROR && 535 sshdr.asc == 0 && sshdr.ascq == 0x1d) 536 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 537 } 538 539 /* Send userspace ATA registers */ 540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 541 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 542 args[0] = desc[13]; /* status */ 543 args[1] = desc[3]; /* error */ 544 args[2] = desc[5]; /* sector count (0:7) */ 545 args[3] = desc[7]; /* lbal */ 546 args[4] = desc[9]; /* lbam */ 547 args[5] = desc[11]; /* lbah */ 548 args[6] = desc[12]; /* select */ 549 if (copy_to_user(arg, args, sizeof(args))) 550 rc = -EFAULT; 551 } 552 } 553 554 if (cmd_result) { 555 rc = -EIO; 556 goto error; 557 } 558 559 error: 560 return rc; 561 } 562 563 static bool ata_ioc32(struct ata_port *ap) 564 { 565 if (ap->flags & ATA_FLAG_PIO_DMA) 566 return true; 567 if (ap->pflags & ATA_PFLAG_PIO32) 568 return true; 569 return false; 570 } 571 572 /* 573 * This handles both native and compat commands, so anything added 574 * here must have a compatible argument, or check in_compat_syscall() 575 */ 576 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 577 unsigned int cmd, void __user *arg) 578 { 579 unsigned long val; 580 int rc = -EINVAL; 581 unsigned long flags; 582 583 switch (cmd) { 584 case HDIO_GET_32BIT: 585 spin_lock_irqsave(ap->lock, flags); 586 val = ata_ioc32(ap); 587 spin_unlock_irqrestore(ap->lock, flags); 588 #ifdef CONFIG_COMPAT 589 if (in_compat_syscall()) 590 return put_user(val, (compat_ulong_t __user *)arg); 591 #endif 592 return put_user(val, (unsigned long __user *)arg); 593 594 case HDIO_SET_32BIT: 595 val = (unsigned long) arg; 596 rc = 0; 597 spin_lock_irqsave(ap->lock, flags); 598 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 599 if (val) 600 ap->pflags |= ATA_PFLAG_PIO32; 601 else 602 ap->pflags &= ~ATA_PFLAG_PIO32; 603 } else { 604 if (val != ata_ioc32(ap)) 605 rc = -EINVAL; 606 } 607 spin_unlock_irqrestore(ap->lock, flags); 608 return rc; 609 610 case HDIO_GET_IDENTITY: 611 return ata_get_identity(ap, scsidev, arg); 612 613 case HDIO_DRIVE_CMD: 614 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 615 return -EACCES; 616 return ata_cmd_ioctl(scsidev, arg); 617 618 case HDIO_DRIVE_TASK: 619 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 620 return -EACCES; 621 return ata_task_ioctl(scsidev, arg); 622 623 default: 624 rc = -ENOTTY; 625 break; 626 } 627 628 return rc; 629 } 630 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 631 632 int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd, 633 void __user *arg) 634 { 635 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 636 scsidev, cmd, arg); 637 } 638 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 639 640 /** 641 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 642 * @dev: ATA device to which the new command is attached 643 * @cmd: SCSI command that originated this ATA command 644 * 645 * Obtain a reference to an unused ata_queued_cmd structure, 646 * which is the basic libata structure representing a single 647 * ATA command sent to the hardware. 648 * 649 * If a command was available, fill in the SCSI-specific 650 * portions of the structure with information on the 651 * current command. 652 * 653 * LOCKING: 654 * spin_lock_irqsave(host lock) 655 * 656 * RETURNS: 657 * Command allocated, or %NULL if none available. 658 */ 659 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 660 struct scsi_cmnd *cmd) 661 { 662 struct ata_port *ap = dev->link->ap; 663 struct ata_queued_cmd *qc; 664 int tag; 665 666 if (unlikely(ata_port_is_frozen(ap))) 667 goto fail; 668 669 if (ap->flags & ATA_FLAG_SAS_HOST) { 670 /* 671 * SAS hosts may queue > ATA_MAX_QUEUE commands so use 672 * unique per-device budget token as a tag. 673 */ 674 if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE)) 675 goto fail; 676 tag = cmd->budget_token; 677 } else { 678 tag = scsi_cmd_to_rq(cmd)->tag; 679 } 680 681 qc = __ata_qc_from_tag(ap, tag); 682 qc->tag = qc->hw_tag = tag; 683 qc->ap = ap; 684 qc->dev = dev; 685 686 ata_qc_reinit(qc); 687 688 qc->scsicmd = cmd; 689 qc->scsidone = scsi_done; 690 691 qc->sg = scsi_sglist(cmd); 692 qc->n_elem = scsi_sg_count(cmd); 693 694 if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET) 695 qc->flags |= ATA_QCFLAG_QUIET; 696 697 return qc; 698 699 fail: 700 set_host_byte(cmd, DID_OK); 701 set_status_byte(cmd, SAM_STAT_TASK_SET_FULL); 702 scsi_done(cmd); 703 return NULL; 704 } 705 706 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 707 { 708 struct scsi_cmnd *scmd = qc->scsicmd; 709 710 qc->extrabytes = scmd->extra_len; 711 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 712 } 713 714 /** 715 * ata_dump_status - user friendly display of error info 716 * @ap: the port in question 717 * @tf: ptr to filled out taskfile 718 * 719 * Decode and dump the ATA error/status registers for the user so 720 * that they have some idea what really happened at the non 721 * make-believe layer. 722 * 723 * LOCKING: 724 * inherited from caller 725 */ 726 static void ata_dump_status(struct ata_port *ap, struct ata_taskfile *tf) 727 { 728 u8 stat = tf->status, err = tf->error; 729 730 if (stat & ATA_BUSY) { 731 ata_port_warn(ap, "status=0x%02x {Busy} ", stat); 732 } else { 733 ata_port_warn(ap, "status=0x%02x { %s%s%s%s%s%s%s} ", stat, 734 stat & ATA_DRDY ? "DriveReady " : "", 735 stat & ATA_DF ? "DeviceFault " : "", 736 stat & ATA_DSC ? "SeekComplete " : "", 737 stat & ATA_DRQ ? "DataRequest " : "", 738 stat & ATA_CORR ? "CorrectedError " : "", 739 stat & ATA_SENSE ? "Sense " : "", 740 stat & ATA_ERR ? "Error " : ""); 741 if (err) 742 ata_port_warn(ap, "error=0x%02x {%s%s%s%s%s%s", err, 743 err & ATA_ABORTED ? 744 "DriveStatusError " : "", 745 err & ATA_ICRC ? 746 (err & ATA_ABORTED ? 747 "BadCRC " : "Sector ") : "", 748 err & ATA_UNC ? "UncorrectableError " : "", 749 err & ATA_IDNF ? "SectorIdNotFound " : "", 750 err & ATA_TRK0NF ? "TrackZeroNotFound " : "", 751 err & ATA_AMNF ? "AddrMarkNotFound " : ""); 752 } 753 } 754 755 /** 756 * ata_to_sense_error - convert ATA error to SCSI error 757 * @id: ATA device number 758 * @drv_stat: value contained in ATA status register 759 * @drv_err: value contained in ATA error register 760 * @sk: the sense key we'll fill out 761 * @asc: the additional sense code we'll fill out 762 * @ascq: the additional sense code qualifier we'll fill out 763 * @verbose: be verbose 764 * 765 * Converts an ATA error into a SCSI error. Fill out pointers to 766 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 767 * format sense blocks. 768 * 769 * LOCKING: 770 * spin_lock_irqsave(host lock) 771 */ 772 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 773 u8 *asc, u8 *ascq, int verbose) 774 { 775 int i; 776 777 /* Based on the 3ware driver translation table */ 778 static const unsigned char sense_table[][4] = { 779 /* BBD|ECC|ID|MAR */ 780 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 781 // Device busy Aborted command 782 /* BBD|ECC|ID */ 783 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 784 // Device busy Aborted command 785 /* ECC|MC|MARK */ 786 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 787 // Device fault Hardware error 788 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 789 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 790 // Data CRC error SCSI parity error 791 /* MC|ID|ABRT|TRK0|MARK */ 792 {0x37, NOT_READY, 0x04, 0x00}, 793 // Unit offline Not ready 794 /* MCR|MARK */ 795 {0x09, NOT_READY, 0x04, 0x00}, 796 // Unrecovered disk error Not ready 797 /* Bad address mark */ 798 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 799 // Address mark not found for data field 800 /* TRK0 - Track 0 not found */ 801 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 802 // Hardware error 803 /* Abort: 0x04 is not translated here, see below */ 804 /* Media change request */ 805 {0x08, NOT_READY, 0x04, 0x00}, 806 // FIXME: faking offline 807 /* SRV/IDNF - ID not found */ 808 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 809 // Logical address out of range 810 /* MC - Media Changed */ 811 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 812 // Not ready to ready change, medium may have changed 813 /* ECC - Uncorrectable ECC error */ 814 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 815 // Unrecovered read error 816 /* BBD - block marked bad */ 817 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 818 // Block marked bad Medium error, unrecovered read error 819 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 820 }; 821 static const unsigned char stat_table[][4] = { 822 /* Must be first because BUSY means no other bits valid */ 823 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 824 // Busy, fake parity for now 825 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 826 // Device ready, unaligned write command 827 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 828 // Device fault, internal target failure 829 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 830 // Timed out in xfer, fake parity for now 831 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 832 // Recovered ECC error Medium error, recovered 833 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 834 }; 835 836 /* 837 * Is this an error we can process/parse 838 */ 839 if (drv_stat & ATA_BUSY) { 840 drv_err = 0; /* Ignore the err bits, they're invalid */ 841 } 842 843 if (drv_err) { 844 /* Look for drv_err */ 845 for (i = 0; sense_table[i][0] != 0xFF; i++) { 846 /* Look for best matches first */ 847 if ((sense_table[i][0] & drv_err) == 848 sense_table[i][0]) { 849 *sk = sense_table[i][1]; 850 *asc = sense_table[i][2]; 851 *ascq = sense_table[i][3]; 852 goto translate_done; 853 } 854 } 855 } 856 857 /* 858 * Fall back to interpreting status bits. Note that if the drv_err 859 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 860 * is not descriptive enough. 861 */ 862 for (i = 0; stat_table[i][0] != 0xFF; i++) { 863 if (stat_table[i][0] & drv_stat) { 864 *sk = stat_table[i][1]; 865 *asc = stat_table[i][2]; 866 *ascq = stat_table[i][3]; 867 goto translate_done; 868 } 869 } 870 871 /* 872 * We need a sensible error return here, which is tricky, and one 873 * that won't cause people to do things like return a disk wrongly. 874 */ 875 *sk = ABORTED_COMMAND; 876 *asc = 0x00; 877 *ascq = 0x00; 878 879 translate_done: 880 if (verbose) 881 pr_err("ata%u: translated ATA stat/err 0x%02x/%02x to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 882 id, drv_stat, drv_err, *sk, *asc, *ascq); 883 return; 884 } 885 886 /* 887 * ata_gen_passthru_sense - Generate check condition sense block. 888 * @qc: Command that completed. 889 * 890 * This function is specific to the ATA descriptor format sense 891 * block specified for the ATA pass through commands. Regardless 892 * of whether the command errored or not, return a sense 893 * block. Copy all controller registers into the sense 894 * block. If there was no error, we get the request from an ATA 895 * passthrough command, so we use the following sense data: 896 * sk = RECOVERED ERROR 897 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 898 * 899 * 900 * LOCKING: 901 * None. 902 */ 903 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 904 { 905 struct scsi_cmnd *cmd = qc->scsicmd; 906 struct ata_taskfile *tf = &qc->result_tf; 907 unsigned char *sb = cmd->sense_buffer; 908 unsigned char *desc = sb + 8; 909 int verbose = qc->ap->ops->error_handler == NULL; 910 u8 sense_key, asc, ascq; 911 912 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 913 914 /* 915 * Use ata_to_sense_error() to map status register bits 916 * onto sense key, asc & ascq. 917 */ 918 if (qc->err_mask || 919 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 920 ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, 921 &sense_key, &asc, &ascq, verbose); 922 ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq); 923 } else { 924 /* 925 * ATA PASS-THROUGH INFORMATION AVAILABLE 926 * Always in descriptor format sense. 927 */ 928 scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D); 929 } 930 931 if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) { 932 u8 len; 933 934 /* descriptor format */ 935 len = sb[7]; 936 desc = (char *)scsi_sense_desc_find(sb, len + 8, 9); 937 if (!desc) { 938 if (SCSI_SENSE_BUFFERSIZE < len + 14) 939 return; 940 sb[7] = len + 14; 941 desc = sb + 8 + len; 942 } 943 desc[0] = 9; 944 desc[1] = 12; 945 /* 946 * Copy registers into sense buffer. 947 */ 948 desc[2] = 0x00; 949 desc[3] = tf->error; 950 desc[5] = tf->nsect; 951 desc[7] = tf->lbal; 952 desc[9] = tf->lbam; 953 desc[11] = tf->lbah; 954 desc[12] = tf->device; 955 desc[13] = tf->status; 956 957 /* 958 * Fill in Extend bit, and the high order bytes 959 * if applicable. 960 */ 961 if (tf->flags & ATA_TFLAG_LBA48) { 962 desc[2] |= 0x01; 963 desc[4] = tf->hob_nsect; 964 desc[6] = tf->hob_lbal; 965 desc[8] = tf->hob_lbam; 966 desc[10] = tf->hob_lbah; 967 } 968 } else { 969 /* Fixed sense format */ 970 desc[0] = tf->error; 971 desc[1] = tf->status; 972 desc[2] = tf->device; 973 desc[3] = tf->nsect; 974 desc[7] = 0; 975 if (tf->flags & ATA_TFLAG_LBA48) { 976 desc[8] |= 0x80; 977 if (tf->hob_nsect) 978 desc[8] |= 0x40; 979 if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah) 980 desc[8] |= 0x20; 981 } 982 desc[9] = tf->lbal; 983 desc[10] = tf->lbam; 984 desc[11] = tf->lbah; 985 } 986 } 987 988 /** 989 * ata_gen_ata_sense - generate a SCSI fixed sense block 990 * @qc: Command that we are erroring out 991 * 992 * Generate sense block for a failed ATA command @qc. Descriptor 993 * format is used to accommodate LBA48 block address. 994 * 995 * LOCKING: 996 * None. 997 */ 998 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 999 { 1000 struct ata_device *dev = qc->dev; 1001 struct scsi_cmnd *cmd = qc->scsicmd; 1002 struct ata_taskfile *tf = &qc->result_tf; 1003 unsigned char *sb = cmd->sense_buffer; 1004 int verbose = qc->ap->ops->error_handler == NULL; 1005 u64 block; 1006 u8 sense_key, asc, ascq; 1007 1008 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1009 1010 if (ata_dev_disabled(dev)) { 1011 /* Device disabled after error recovery */ 1012 /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */ 1013 ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21); 1014 return; 1015 } 1016 /* Use ata_to_sense_error() to map status register bits 1017 * onto sense key, asc & ascq. 1018 */ 1019 if (qc->err_mask || 1020 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1021 ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, 1022 &sense_key, &asc, &ascq, verbose); 1023 ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq); 1024 } else { 1025 /* Could not decode error */ 1026 ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n", 1027 tf->status, qc->err_mask); 1028 ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0); 1029 return; 1030 } 1031 1032 block = ata_tf_read_block(&qc->result_tf, dev); 1033 if (block == U64_MAX) 1034 return; 1035 1036 scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block); 1037 } 1038 1039 void ata_scsi_sdev_config(struct scsi_device *sdev) 1040 { 1041 sdev->use_10_for_rw = 1; 1042 sdev->use_10_for_ms = 1; 1043 sdev->no_write_same = 1; 1044 1045 /* Schedule policy is determined by ->qc_defer() callback and 1046 * it needs to see every deferred qc. Set dev_blocked to 1 to 1047 * prevent SCSI midlayer from automatically deferring 1048 * requests. 1049 */ 1050 sdev->max_device_blocked = 1; 1051 } 1052 1053 /** 1054 * ata_scsi_dma_need_drain - Check whether data transfer may overflow 1055 * @rq: request to be checked 1056 * 1057 * ATAPI commands which transfer variable length data to host 1058 * might overflow due to application error or hardware bug. This 1059 * function checks whether overflow should be drained and ignored 1060 * for @request. 1061 * 1062 * LOCKING: 1063 * None. 1064 * 1065 * RETURNS: 1066 * 1 if ; otherwise, 0. 1067 */ 1068 bool ata_scsi_dma_need_drain(struct request *rq) 1069 { 1070 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq); 1071 1072 return atapi_cmd_type(scmd->cmnd[0]) == ATAPI_MISC; 1073 } 1074 EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain); 1075 1076 int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) 1077 { 1078 struct request_queue *q = sdev->request_queue; 1079 int depth = 1; 1080 1081 if (!ata_id_has_unload(dev->id)) 1082 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1083 1084 /* configure max sectors */ 1085 dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors); 1086 blk_queue_max_hw_sectors(q, dev->max_sectors); 1087 1088 if (dev->class == ATA_DEV_ATAPI) { 1089 sdev->sector_size = ATA_SECT_SIZE; 1090 1091 /* set DMA padding */ 1092 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1093 1094 /* make room for appending the drain */ 1095 blk_queue_max_segments(q, queue_max_segments(q) - 1); 1096 1097 sdev->dma_drain_len = ATAPI_MAX_DRAIN; 1098 sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO); 1099 if (!sdev->dma_drain_buf) { 1100 ata_dev_err(dev, "drain buffer allocation failed\n"); 1101 return -ENOMEM; 1102 } 1103 } else { 1104 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1105 sdev->manage_start_stop = 1; 1106 } 1107 1108 /* 1109 * ata_pio_sectors() expects buffer for each sector to not cross 1110 * page boundary. Enforce it by requiring buffers to be sector 1111 * aligned, which works iff sector_size is not larger than 1112 * PAGE_SIZE. ATAPI devices also need the alignment as 1113 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1114 */ 1115 if (sdev->sector_size > PAGE_SIZE) 1116 ata_dev_warn(dev, 1117 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1118 sdev->sector_size); 1119 1120 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1121 1122 if (dev->flags & ATA_DFLAG_AN) 1123 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1124 1125 if (dev->flags & ATA_DFLAG_NCQ) 1126 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1127 depth = min(ATA_MAX_QUEUE, depth); 1128 scsi_change_queue_depth(sdev, depth); 1129 1130 if (dev->flags & ATA_DFLAG_TRUSTED) 1131 sdev->security_supported = 1; 1132 1133 dev->sdev = sdev; 1134 return 0; 1135 } 1136 1137 /** 1138 * ata_scsi_slave_config - Set SCSI device attributes 1139 * @sdev: SCSI device to examine 1140 * 1141 * This is called before we actually start reading 1142 * and writing to the device, to configure certain 1143 * SCSI mid-layer behaviors. 1144 * 1145 * LOCKING: 1146 * Defined by SCSI layer. We don't really care. 1147 */ 1148 1149 int ata_scsi_slave_config(struct scsi_device *sdev) 1150 { 1151 struct ata_port *ap = ata_shost_to_port(sdev->host); 1152 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1153 int rc = 0; 1154 1155 ata_scsi_sdev_config(sdev); 1156 1157 if (dev) 1158 rc = ata_scsi_dev_config(sdev, dev); 1159 1160 return rc; 1161 } 1162 EXPORT_SYMBOL_GPL(ata_scsi_slave_config); 1163 1164 /** 1165 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1166 * @sdev: SCSI device to be destroyed 1167 * 1168 * @sdev is about to be destroyed for hot/warm unplugging. If 1169 * this unplugging was initiated by libata as indicated by NULL 1170 * dev->sdev, this function doesn't have to do anything. 1171 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1172 * Clear dev->sdev, schedule the device for ATA detach and invoke 1173 * EH. 1174 * 1175 * LOCKING: 1176 * Defined by SCSI layer. We don't really care. 1177 */ 1178 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1179 { 1180 struct ata_port *ap = ata_shost_to_port(sdev->host); 1181 unsigned long flags; 1182 struct ata_device *dev; 1183 1184 if (!ap->ops->error_handler) 1185 return; 1186 1187 spin_lock_irqsave(ap->lock, flags); 1188 dev = __ata_scsi_find_dev(ap, sdev); 1189 if (dev && dev->sdev) { 1190 /* SCSI device already in CANCEL state, no need to offline it */ 1191 dev->sdev = NULL; 1192 dev->flags |= ATA_DFLAG_DETACH; 1193 ata_port_schedule_eh(ap); 1194 } 1195 spin_unlock_irqrestore(ap->lock, flags); 1196 1197 kfree(sdev->dma_drain_buf); 1198 } 1199 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy); 1200 1201 /** 1202 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1203 * @qc: Storage for translated ATA taskfile 1204 * 1205 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1206 * (to start). Perhaps these commands should be preceded by 1207 * CHECK POWER MODE to see what power mode the device is already in. 1208 * [See SAT revision 5 at www.t10.org] 1209 * 1210 * LOCKING: 1211 * spin_lock_irqsave(host lock) 1212 * 1213 * RETURNS: 1214 * Zero on success, non-zero on error. 1215 */ 1216 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1217 { 1218 struct scsi_cmnd *scmd = qc->scsicmd; 1219 struct ata_taskfile *tf = &qc->tf; 1220 const u8 *cdb = scmd->cmnd; 1221 u16 fp; 1222 u8 bp = 0xff; 1223 1224 if (scmd->cmd_len < 5) { 1225 fp = 4; 1226 goto invalid_fld; 1227 } 1228 1229 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1230 tf->protocol = ATA_PROT_NODATA; 1231 if (cdb[1] & 0x1) { 1232 ; /* ignore IMMED bit, violates sat-r05 */ 1233 } 1234 if (cdb[4] & 0x2) { 1235 fp = 4; 1236 bp = 1; 1237 goto invalid_fld; /* LOEJ bit set not supported */ 1238 } 1239 if (((cdb[4] >> 4) & 0xf) != 0) { 1240 fp = 4; 1241 bp = 3; 1242 goto invalid_fld; /* power conditions not supported */ 1243 } 1244 1245 if (cdb[4] & 0x1) { 1246 tf->nsect = 1; /* 1 sector, lba=0 */ 1247 1248 if (qc->dev->flags & ATA_DFLAG_LBA) { 1249 tf->flags |= ATA_TFLAG_LBA; 1250 1251 tf->lbah = 0x0; 1252 tf->lbam = 0x0; 1253 tf->lbal = 0x0; 1254 tf->device |= ATA_LBA; 1255 } else { 1256 /* CHS */ 1257 tf->lbal = 0x1; /* sect */ 1258 tf->lbam = 0x0; /* cyl low */ 1259 tf->lbah = 0x0; /* cyl high */ 1260 } 1261 1262 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1263 } else { 1264 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1265 * or S5) causing some drives to spin up and down again. 1266 */ 1267 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1268 system_state == SYSTEM_POWER_OFF) 1269 goto skip; 1270 1271 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1272 system_entering_hibernation()) 1273 goto skip; 1274 1275 /* Issue ATA STANDBY IMMEDIATE command */ 1276 tf->command = ATA_CMD_STANDBYNOW1; 1277 } 1278 1279 /* 1280 * Standby and Idle condition timers could be implemented but that 1281 * would require libata to implement the Power condition mode page 1282 * and allow the user to change it. Changing mode pages requires 1283 * MODE SELECT to be implemented. 1284 */ 1285 1286 return 0; 1287 1288 invalid_fld: 1289 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 1290 return 1; 1291 skip: 1292 scmd->result = SAM_STAT_GOOD; 1293 return 1; 1294 } 1295 1296 1297 /** 1298 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1299 * @qc: Storage for translated ATA taskfile 1300 * 1301 * Sets up an ATA taskfile to issue FLUSH CACHE or 1302 * FLUSH CACHE EXT. 1303 * 1304 * LOCKING: 1305 * spin_lock_irqsave(host lock) 1306 * 1307 * RETURNS: 1308 * Zero on success, non-zero on error. 1309 */ 1310 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1311 { 1312 struct ata_taskfile *tf = &qc->tf; 1313 1314 tf->flags |= ATA_TFLAG_DEVICE; 1315 tf->protocol = ATA_PROT_NODATA; 1316 1317 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1318 tf->command = ATA_CMD_FLUSH_EXT; 1319 else 1320 tf->command = ATA_CMD_FLUSH; 1321 1322 /* flush is critical for IO integrity, consider it an IO command */ 1323 qc->flags |= ATA_QCFLAG_IO; 1324 1325 return 0; 1326 } 1327 1328 /** 1329 * scsi_6_lba_len - Get LBA and transfer length 1330 * @cdb: SCSI command to translate 1331 * 1332 * Calculate LBA and transfer length for 6-byte commands. 1333 * 1334 * RETURNS: 1335 * @plba: the LBA 1336 * @plen: the transfer length 1337 */ 1338 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1339 { 1340 u64 lba = 0; 1341 u32 len; 1342 1343 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1344 lba |= ((u64)cdb[2]) << 8; 1345 lba |= ((u64)cdb[3]); 1346 1347 len = cdb[4]; 1348 1349 *plba = lba; 1350 *plen = len; 1351 } 1352 1353 /** 1354 * scsi_10_lba_len - Get LBA and transfer length 1355 * @cdb: SCSI command to translate 1356 * 1357 * Calculate LBA and transfer length for 10-byte commands. 1358 * 1359 * RETURNS: 1360 * @plba: the LBA 1361 * @plen: the transfer length 1362 */ 1363 static inline void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1364 { 1365 *plba = get_unaligned_be32(&cdb[2]); 1366 *plen = get_unaligned_be16(&cdb[7]); 1367 } 1368 1369 /** 1370 * scsi_16_lba_len - Get LBA and transfer length 1371 * @cdb: SCSI command to translate 1372 * 1373 * Calculate LBA and transfer length for 16-byte commands. 1374 * 1375 * RETURNS: 1376 * @plba: the LBA 1377 * @plen: the transfer length 1378 */ 1379 static inline void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1380 { 1381 *plba = get_unaligned_be64(&cdb[2]); 1382 *plen = get_unaligned_be32(&cdb[10]); 1383 } 1384 1385 /** 1386 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1387 * @qc: Storage for translated ATA taskfile 1388 * 1389 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1390 * 1391 * LOCKING: 1392 * spin_lock_irqsave(host lock) 1393 * 1394 * RETURNS: 1395 * Zero on success, non-zero on error. 1396 */ 1397 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1398 { 1399 struct scsi_cmnd *scmd = qc->scsicmd; 1400 struct ata_taskfile *tf = &qc->tf; 1401 struct ata_device *dev = qc->dev; 1402 u64 dev_sectors = qc->dev->n_sectors; 1403 const u8 *cdb = scmd->cmnd; 1404 u64 block; 1405 u32 n_block; 1406 u16 fp; 1407 1408 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1409 tf->protocol = ATA_PROT_NODATA; 1410 1411 switch (cdb[0]) { 1412 case VERIFY: 1413 if (scmd->cmd_len < 10) { 1414 fp = 9; 1415 goto invalid_fld; 1416 } 1417 scsi_10_lba_len(cdb, &block, &n_block); 1418 break; 1419 case VERIFY_16: 1420 if (scmd->cmd_len < 16) { 1421 fp = 15; 1422 goto invalid_fld; 1423 } 1424 scsi_16_lba_len(cdb, &block, &n_block); 1425 break; 1426 default: 1427 fp = 0; 1428 goto invalid_fld; 1429 } 1430 1431 if (!n_block) 1432 goto nothing_to_do; 1433 if (block >= dev_sectors) 1434 goto out_of_range; 1435 if ((block + n_block) > dev_sectors) 1436 goto out_of_range; 1437 1438 if (dev->flags & ATA_DFLAG_LBA) { 1439 tf->flags |= ATA_TFLAG_LBA; 1440 1441 if (lba_28_ok(block, n_block)) { 1442 /* use LBA28 */ 1443 tf->command = ATA_CMD_VERIFY; 1444 tf->device |= (block >> 24) & 0xf; 1445 } else if (lba_48_ok(block, n_block)) { 1446 if (!(dev->flags & ATA_DFLAG_LBA48)) 1447 goto out_of_range; 1448 1449 /* use LBA48 */ 1450 tf->flags |= ATA_TFLAG_LBA48; 1451 tf->command = ATA_CMD_VERIFY_EXT; 1452 1453 tf->hob_nsect = (n_block >> 8) & 0xff; 1454 1455 tf->hob_lbah = (block >> 40) & 0xff; 1456 tf->hob_lbam = (block >> 32) & 0xff; 1457 tf->hob_lbal = (block >> 24) & 0xff; 1458 } else 1459 /* request too large even for LBA48 */ 1460 goto out_of_range; 1461 1462 tf->nsect = n_block & 0xff; 1463 1464 tf->lbah = (block >> 16) & 0xff; 1465 tf->lbam = (block >> 8) & 0xff; 1466 tf->lbal = block & 0xff; 1467 1468 tf->device |= ATA_LBA; 1469 } else { 1470 /* CHS */ 1471 u32 sect, head, cyl, track; 1472 1473 if (!lba_28_ok(block, n_block)) 1474 goto out_of_range; 1475 1476 /* Convert LBA to CHS */ 1477 track = (u32)block / dev->sectors; 1478 cyl = track / dev->heads; 1479 head = track % dev->heads; 1480 sect = (u32)block % dev->sectors + 1; 1481 1482 /* Check whether the converted CHS can fit. 1483 Cylinder: 0-65535 1484 Head: 0-15 1485 Sector: 1-255*/ 1486 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1487 goto out_of_range; 1488 1489 tf->command = ATA_CMD_VERIFY; 1490 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1491 tf->lbal = sect; 1492 tf->lbam = cyl; 1493 tf->lbah = cyl >> 8; 1494 tf->device |= head; 1495 } 1496 1497 return 0; 1498 1499 invalid_fld: 1500 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1501 return 1; 1502 1503 out_of_range: 1504 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1505 /* "Logical Block Address out of range" */ 1506 return 1; 1507 1508 nothing_to_do: 1509 scmd->result = SAM_STAT_GOOD; 1510 return 1; 1511 } 1512 1513 static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks) 1514 { 1515 struct request *rq = scsi_cmd_to_rq(scmd); 1516 u32 req_blocks; 1517 1518 if (!blk_rq_is_passthrough(rq)) 1519 return true; 1520 1521 req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size; 1522 if (n_blocks > req_blocks) 1523 return false; 1524 1525 return true; 1526 } 1527 1528 /** 1529 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1530 * @qc: Storage for translated ATA taskfile 1531 * 1532 * Converts any of six SCSI read/write commands into the 1533 * ATA counterpart, including starting sector (LBA), 1534 * sector count, and taking into account the device's LBA48 1535 * support. 1536 * 1537 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1538 * %WRITE_16 are currently supported. 1539 * 1540 * LOCKING: 1541 * spin_lock_irqsave(host lock) 1542 * 1543 * RETURNS: 1544 * Zero on success, non-zero on error. 1545 */ 1546 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1547 { 1548 struct scsi_cmnd *scmd = qc->scsicmd; 1549 const u8 *cdb = scmd->cmnd; 1550 struct request *rq = scsi_cmd_to_rq(scmd); 1551 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq)); 1552 unsigned int tf_flags = 0; 1553 u64 block; 1554 u32 n_block; 1555 int rc; 1556 u16 fp = 0; 1557 1558 switch (cdb[0]) { 1559 case WRITE_6: 1560 case WRITE_10: 1561 case WRITE_16: 1562 tf_flags |= ATA_TFLAG_WRITE; 1563 break; 1564 } 1565 1566 /* Calculate the SCSI LBA, transfer length and FUA. */ 1567 switch (cdb[0]) { 1568 case READ_10: 1569 case WRITE_10: 1570 if (unlikely(scmd->cmd_len < 10)) { 1571 fp = 9; 1572 goto invalid_fld; 1573 } 1574 scsi_10_lba_len(cdb, &block, &n_block); 1575 if (cdb[1] & (1 << 3)) 1576 tf_flags |= ATA_TFLAG_FUA; 1577 if (!ata_check_nblocks(scmd, n_block)) 1578 goto invalid_fld; 1579 break; 1580 case READ_6: 1581 case WRITE_6: 1582 if (unlikely(scmd->cmd_len < 6)) { 1583 fp = 5; 1584 goto invalid_fld; 1585 } 1586 scsi_6_lba_len(cdb, &block, &n_block); 1587 1588 /* for 6-byte r/w commands, transfer length 0 1589 * means 256 blocks of data, not 0 block. 1590 */ 1591 if (!n_block) 1592 n_block = 256; 1593 if (!ata_check_nblocks(scmd, n_block)) 1594 goto invalid_fld; 1595 break; 1596 case READ_16: 1597 case WRITE_16: 1598 if (unlikely(scmd->cmd_len < 16)) { 1599 fp = 15; 1600 goto invalid_fld; 1601 } 1602 scsi_16_lba_len(cdb, &block, &n_block); 1603 if (cdb[1] & (1 << 3)) 1604 tf_flags |= ATA_TFLAG_FUA; 1605 if (!ata_check_nblocks(scmd, n_block)) 1606 goto invalid_fld; 1607 break; 1608 default: 1609 fp = 0; 1610 goto invalid_fld; 1611 } 1612 1613 /* Check and compose ATA command */ 1614 if (!n_block) 1615 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1616 * length 0 means transfer 0 block of data. 1617 * However, for ATA R/W commands, sector count 0 means 1618 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1619 * 1620 * WARNING: one or two older ATA drives treat 0 as 0... 1621 */ 1622 goto nothing_to_do; 1623 1624 qc->flags |= ATA_QCFLAG_IO; 1625 qc->nbytes = n_block * scmd->device->sector_size; 1626 1627 rc = ata_build_rw_tf(qc, block, n_block, tf_flags, class); 1628 if (likely(rc == 0)) 1629 return 0; 1630 1631 if (rc == -ERANGE) 1632 goto out_of_range; 1633 /* treat all other errors as -EINVAL, fall through */ 1634 invalid_fld: 1635 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1636 return 1; 1637 1638 out_of_range: 1639 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1640 /* "Logical Block Address out of range" */ 1641 return 1; 1642 1643 nothing_to_do: 1644 scmd->result = SAM_STAT_GOOD; 1645 return 1; 1646 } 1647 1648 static void ata_qc_done(struct ata_queued_cmd *qc) 1649 { 1650 struct scsi_cmnd *cmd = qc->scsicmd; 1651 void (*done)(struct scsi_cmnd *) = qc->scsidone; 1652 1653 ata_qc_free(qc); 1654 done(cmd); 1655 } 1656 1657 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1658 { 1659 struct ata_port *ap = qc->ap; 1660 struct scsi_cmnd *cmd = qc->scsicmd; 1661 u8 *cdb = cmd->cmnd; 1662 int need_sense = (qc->err_mask != 0) && 1663 !(qc->flags & ATA_QCFLAG_SENSE_VALID); 1664 1665 /* For ATA pass thru (SAT) commands, generate a sense block if 1666 * user mandated it or if there's an error. Note that if we 1667 * generate because the user forced us to [CK_COND =1], a check 1668 * condition is generated and the ATA register values are returned 1669 * whether the command completed successfully or not. If there 1670 * was no error, we use the following sense data: 1671 * sk = RECOVERED ERROR 1672 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1673 */ 1674 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1675 ((cdb[2] & 0x20) || need_sense)) 1676 ata_gen_passthru_sense(qc); 1677 else if (need_sense) 1678 ata_gen_ata_sense(qc); 1679 else 1680 /* Keep the SCSI ML and status byte, clear host byte. */ 1681 cmd->result &= 0x0000ffff; 1682 1683 if (need_sense && !ap->ops->error_handler) 1684 ata_dump_status(ap, &qc->result_tf); 1685 1686 ata_qc_done(qc); 1687 } 1688 1689 /** 1690 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1691 * @dev: ATA device to which the command is addressed 1692 * @cmd: SCSI command to execute 1693 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1694 * 1695 * Our ->queuecommand() function has decided that the SCSI 1696 * command issued can be directly translated into an ATA 1697 * command, rather than handled internally. 1698 * 1699 * This function sets up an ata_queued_cmd structure for the 1700 * SCSI command, and sends that ata_queued_cmd to the hardware. 1701 * 1702 * The xlat_func argument (actor) returns 0 if ready to execute 1703 * ATA command, else 1 to finish translation. If 1 is returned 1704 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1705 * to be set reflecting an error condition or clean (early) 1706 * termination. 1707 * 1708 * LOCKING: 1709 * spin_lock_irqsave(host lock) 1710 * 1711 * RETURNS: 1712 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1713 * needs to be deferred. 1714 */ 1715 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1716 ata_xlat_func_t xlat_func) 1717 { 1718 struct ata_port *ap = dev->link->ap; 1719 struct ata_queued_cmd *qc; 1720 int rc; 1721 1722 qc = ata_scsi_qc_new(dev, cmd); 1723 if (!qc) 1724 goto err_mem; 1725 1726 /* data is present; dma-map it */ 1727 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1728 cmd->sc_data_direction == DMA_TO_DEVICE) { 1729 if (unlikely(scsi_bufflen(cmd) < 1)) { 1730 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1731 goto err_did; 1732 } 1733 1734 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1735 1736 qc->dma_dir = cmd->sc_data_direction; 1737 } 1738 1739 qc->complete_fn = ata_scsi_qc_complete; 1740 1741 if (xlat_func(qc)) 1742 goto early_finish; 1743 1744 if (ap->ops->qc_defer) { 1745 if ((rc = ap->ops->qc_defer(qc))) 1746 goto defer; 1747 } 1748 1749 /* select device, send command to hardware */ 1750 ata_qc_issue(qc); 1751 1752 return 0; 1753 1754 early_finish: 1755 ata_qc_free(qc); 1756 scsi_done(cmd); 1757 return 0; 1758 1759 err_did: 1760 ata_qc_free(qc); 1761 cmd->result = (DID_ERROR << 16); 1762 scsi_done(cmd); 1763 err_mem: 1764 return 0; 1765 1766 defer: 1767 ata_qc_free(qc); 1768 if (rc == ATA_DEFER_LINK) 1769 return SCSI_MLQUEUE_DEVICE_BUSY; 1770 else 1771 return SCSI_MLQUEUE_HOST_BUSY; 1772 } 1773 1774 struct ata_scsi_args { 1775 struct ata_device *dev; 1776 u16 *id; 1777 struct scsi_cmnd *cmd; 1778 }; 1779 1780 /** 1781 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1782 * @args: device IDENTIFY data / SCSI command of interest. 1783 * @actor: Callback hook for desired SCSI command simulator 1784 * 1785 * Takes care of the hard work of simulating a SCSI command... 1786 * Mapping the response buffer, calling the command's handler, 1787 * and handling the handler's return value. This return value 1788 * indicates whether the handler wishes the SCSI command to be 1789 * completed successfully (0), or not (in which case cmd->result 1790 * and sense buffer are assumed to be set). 1791 * 1792 * LOCKING: 1793 * spin_lock_irqsave(host lock) 1794 */ 1795 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1796 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1797 { 1798 unsigned int rc; 1799 struct scsi_cmnd *cmd = args->cmd; 1800 unsigned long flags; 1801 1802 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 1803 1804 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1805 rc = actor(args, ata_scsi_rbuf); 1806 if (rc == 0) 1807 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1808 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1809 1810 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 1811 1812 if (rc == 0) 1813 cmd->result = SAM_STAT_GOOD; 1814 } 1815 1816 /** 1817 * ata_scsiop_inq_std - Simulate INQUIRY command 1818 * @args: device IDENTIFY data / SCSI command of interest. 1819 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1820 * 1821 * Returns standard device identification data associated 1822 * with non-VPD INQUIRY command output. 1823 * 1824 * LOCKING: 1825 * spin_lock_irqsave(host lock) 1826 */ 1827 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1828 { 1829 static const u8 versions[] = { 1830 0x00, 1831 0x60, /* SAM-3 (no version claimed) */ 1832 1833 0x03, 1834 0x20, /* SBC-2 (no version claimed) */ 1835 1836 0x03, 1837 0x00 /* SPC-3 (no version claimed) */ 1838 }; 1839 static const u8 versions_zbc[] = { 1840 0x00, 1841 0xA0, /* SAM-5 (no version claimed) */ 1842 1843 0x06, 1844 0x00, /* SBC-4 (no version claimed) */ 1845 1846 0x05, 1847 0xC0, /* SPC-5 (no version claimed) */ 1848 1849 0x60, 1850 0x24, /* ZBC r05 */ 1851 }; 1852 1853 u8 hdr[] = { 1854 TYPE_DISK, 1855 0, 1856 0x5, /* claim SPC-3 version compatibility */ 1857 2, 1858 95 - 4, 1859 0, 1860 0, 1861 2 1862 }; 1863 1864 /* set scsi removable (RMB) bit per ata bit, or if the 1865 * AHCI port says it's external (Hotplug-capable, eSATA). 1866 */ 1867 if (ata_id_removable(args->id) || 1868 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) 1869 hdr[1] |= (1 << 7); 1870 1871 if (args->dev->class == ATA_DEV_ZAC) { 1872 hdr[0] = TYPE_ZBC; 1873 hdr[2] = 0x7; /* claim SPC-5 version compatibility */ 1874 } 1875 1876 memcpy(rbuf, hdr, sizeof(hdr)); 1877 memcpy(&rbuf[8], "ATA ", 8); 1878 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1879 1880 /* From SAT, use last 2 words from fw rev unless they are spaces */ 1881 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 1882 if (strncmp(&rbuf[32], " ", 4) == 0) 1883 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1884 1885 if (rbuf[32] == 0 || rbuf[32] == ' ') 1886 memcpy(&rbuf[32], "n/a ", 4); 1887 1888 if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC) 1889 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 1890 else 1891 memcpy(rbuf + 58, versions, sizeof(versions)); 1892 1893 return 0; 1894 } 1895 1896 /** 1897 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1898 * @args: device IDENTIFY data / SCSI command of interest. 1899 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1900 * 1901 * Returns list of inquiry VPD pages available. 1902 * 1903 * LOCKING: 1904 * spin_lock_irqsave(host lock) 1905 */ 1906 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1907 { 1908 int i, num_pages = 0; 1909 static const u8 pages[] = { 1910 0x00, /* page 0x00, this page */ 1911 0x80, /* page 0x80, unit serial no page */ 1912 0x83, /* page 0x83, device ident page */ 1913 0x89, /* page 0x89, ata info page */ 1914 0xb0, /* page 0xb0, block limits page */ 1915 0xb1, /* page 0xb1, block device characteristics page */ 1916 0xb2, /* page 0xb2, thin provisioning page */ 1917 0xb6, /* page 0xb6, zoned block device characteristics */ 1918 0xb9, /* page 0xb9, concurrent positioning ranges */ 1919 }; 1920 1921 for (i = 0; i < sizeof(pages); i++) { 1922 if (pages[i] == 0xb6 && 1923 !(args->dev->flags & ATA_DFLAG_ZAC)) 1924 continue; 1925 rbuf[num_pages + 4] = pages[i]; 1926 num_pages++; 1927 } 1928 rbuf[3] = num_pages; /* number of supported VPD pages */ 1929 return 0; 1930 } 1931 1932 /** 1933 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1934 * @args: device IDENTIFY data / SCSI command of interest. 1935 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1936 * 1937 * Returns ATA device serial number. 1938 * 1939 * LOCKING: 1940 * spin_lock_irqsave(host lock) 1941 */ 1942 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1943 { 1944 static const u8 hdr[] = { 1945 0, 1946 0x80, /* this page code */ 1947 0, 1948 ATA_ID_SERNO_LEN, /* page len */ 1949 }; 1950 1951 memcpy(rbuf, hdr, sizeof(hdr)); 1952 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1953 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1954 return 0; 1955 } 1956 1957 /** 1958 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1959 * @args: device IDENTIFY data / SCSI command of interest. 1960 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1961 * 1962 * Yields two logical unit device identification designators: 1963 * - vendor specific ASCII containing the ATA serial number 1964 * - SAT defined "t10 vendor id based" containing ASCII vendor 1965 * name ("ATA "), model and serial numbers. 1966 * 1967 * LOCKING: 1968 * spin_lock_irqsave(host lock) 1969 */ 1970 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 1971 { 1972 const int sat_model_serial_desc_len = 68; 1973 int num; 1974 1975 rbuf[1] = 0x83; /* this page code */ 1976 num = 4; 1977 1978 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1979 rbuf[num + 0] = 2; 1980 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1981 num += 4; 1982 ata_id_string(args->id, (unsigned char *) rbuf + num, 1983 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1984 num += ATA_ID_SERNO_LEN; 1985 1986 /* SAT defined lu model and serial numbers descriptor */ 1987 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1988 rbuf[num + 0] = 2; 1989 rbuf[num + 1] = 1; 1990 rbuf[num + 3] = sat_model_serial_desc_len; 1991 num += 4; 1992 memcpy(rbuf + num, "ATA ", 8); 1993 num += 8; 1994 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 1995 ATA_ID_PROD_LEN); 1996 num += ATA_ID_PROD_LEN; 1997 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 1998 ATA_ID_SERNO_LEN); 1999 num += ATA_ID_SERNO_LEN; 2000 2001 if (ata_id_has_wwn(args->id)) { 2002 /* SAT defined lu world wide name */ 2003 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2004 rbuf[num + 0] = 1; 2005 rbuf[num + 1] = 3; 2006 rbuf[num + 3] = ATA_ID_WWN_LEN; 2007 num += 4; 2008 ata_id_string(args->id, (unsigned char *) rbuf + num, 2009 ATA_ID_WWN, ATA_ID_WWN_LEN); 2010 num += ATA_ID_WWN_LEN; 2011 } 2012 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2013 return 0; 2014 } 2015 2016 /** 2017 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2018 * @args: device IDENTIFY data / SCSI command of interest. 2019 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2020 * 2021 * Yields SAT-specified ATA VPD page. 2022 * 2023 * LOCKING: 2024 * spin_lock_irqsave(host lock) 2025 */ 2026 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2027 { 2028 rbuf[1] = 0x89; /* our page code */ 2029 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2030 rbuf[3] = (0x238 & 0xff); 2031 2032 memcpy(&rbuf[8], "linux ", 8); 2033 memcpy(&rbuf[16], "libata ", 16); 2034 memcpy(&rbuf[32], DRV_VERSION, 4); 2035 2036 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2037 rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */ 2038 /* TODO: PMP? */ 2039 2040 /* we don't store the ATA device signature, so we fake it */ 2041 rbuf[38] = ATA_DRDY; /* really, this is Status reg */ 2042 rbuf[40] = 0x1; 2043 rbuf[48] = 0x1; 2044 2045 rbuf[56] = ATA_CMD_ID_ATA; 2046 2047 memcpy(&rbuf[60], &args->id[0], 512); 2048 return 0; 2049 } 2050 2051 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2052 { 2053 struct ata_device *dev = args->dev; 2054 u16 min_io_sectors; 2055 2056 rbuf[1] = 0xb0; 2057 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2058 2059 /* 2060 * Optimal transfer length granularity. 2061 * 2062 * This is always one physical block, but for disks with a smaller 2063 * logical than physical sector size we need to figure out what the 2064 * latter is. 2065 */ 2066 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2067 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2068 2069 /* 2070 * Optimal unmap granularity. 2071 * 2072 * The ATA spec doesn't even know about a granularity or alignment 2073 * for the TRIM command. We can leave away most of the unmap related 2074 * VPD page entries, but we have specifify a granularity to signal 2075 * that we support some form of unmap - in thise case via WRITE SAME 2076 * with the unmap bit set. 2077 */ 2078 if (ata_id_has_trim(args->id)) { 2079 u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM; 2080 2081 if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M) 2082 max_blocks = 128 << (20 - SECTOR_SHIFT); 2083 2084 put_unaligned_be64(max_blocks, &rbuf[36]); 2085 put_unaligned_be32(1, &rbuf[28]); 2086 } 2087 2088 return 0; 2089 } 2090 2091 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2092 { 2093 int form_factor = ata_id_form_factor(args->id); 2094 int media_rotation_rate = ata_id_rotation_rate(args->id); 2095 u8 zoned = ata_id_zoned_cap(args->id); 2096 2097 rbuf[1] = 0xb1; 2098 rbuf[3] = 0x3c; 2099 rbuf[4] = media_rotation_rate >> 8; 2100 rbuf[5] = media_rotation_rate; 2101 rbuf[7] = form_factor; 2102 if (zoned) 2103 rbuf[8] = (zoned << 4); 2104 2105 return 0; 2106 } 2107 2108 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2109 { 2110 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2111 rbuf[1] = 0xb2; 2112 rbuf[3] = 0x4; 2113 rbuf[5] = 1 << 6; /* TPWS */ 2114 2115 return 0; 2116 } 2117 2118 static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) 2119 { 2120 /* 2121 * zbc-r05 SCSI Zoned Block device characteristics VPD page 2122 */ 2123 rbuf[1] = 0xb6; 2124 rbuf[3] = 0x3C; 2125 2126 /* 2127 * URSWRZ bit is only meaningful for host-managed ZAC drives 2128 */ 2129 if (args->dev->zac_zoned_cap & 1) 2130 rbuf[4] |= 1; 2131 put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]); 2132 put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]); 2133 put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]); 2134 2135 return 0; 2136 } 2137 2138 static unsigned int ata_scsiop_inq_b9(struct ata_scsi_args *args, u8 *rbuf) 2139 { 2140 struct ata_cpr_log *cpr_log = args->dev->cpr_log; 2141 u8 *desc = &rbuf[64]; 2142 int i; 2143 2144 /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */ 2145 rbuf[1] = 0xb9; 2146 put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]); 2147 2148 for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) { 2149 desc[0] = cpr_log->cpr[i].num; 2150 desc[1] = cpr_log->cpr[i].num_storage_elements; 2151 put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]); 2152 put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[16]); 2153 } 2154 2155 return 0; 2156 } 2157 2158 /** 2159 * modecpy - Prepare response for MODE SENSE 2160 * @dest: output buffer 2161 * @src: data being copied 2162 * @n: length of mode page 2163 * @changeable: whether changeable parameters are requested 2164 * 2165 * Generate a generic MODE SENSE page for either current or changeable 2166 * parameters. 2167 * 2168 * LOCKING: 2169 * None. 2170 */ 2171 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2172 { 2173 if (changeable) { 2174 memcpy(dest, src, 2); 2175 memset(dest + 2, 0, n - 2); 2176 } else { 2177 memcpy(dest, src, n); 2178 } 2179 } 2180 2181 /** 2182 * ata_msense_caching - Simulate MODE SENSE caching info page 2183 * @id: device IDENTIFY data 2184 * @buf: output buffer 2185 * @changeable: whether changeable parameters are requested 2186 * 2187 * Generate a caching info page, which conditionally indicates 2188 * write caching to the SCSI layer, depending on device 2189 * capabilities. 2190 * 2191 * LOCKING: 2192 * None. 2193 */ 2194 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2195 { 2196 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2197 if (changeable) { 2198 buf[2] |= (1 << 2); /* ata_mselect_caching() */ 2199 } else { 2200 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */ 2201 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */ 2202 } 2203 return sizeof(def_cache_mpage); 2204 } 2205 2206 /** 2207 * ata_msense_control - Simulate MODE SENSE control mode page 2208 * @dev: ATA device of interest 2209 * @buf: output buffer 2210 * @changeable: whether changeable parameters are requested 2211 * 2212 * Generate a generic MODE SENSE control mode page. 2213 * 2214 * LOCKING: 2215 * None. 2216 */ 2217 static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf, 2218 bool changeable) 2219 { 2220 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2221 if (changeable) { 2222 buf[2] |= (1 << 2); /* ata_mselect_control() */ 2223 } else { 2224 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 2225 2226 buf[2] |= (d_sense << 2); /* descriptor format sense data */ 2227 } 2228 return sizeof(def_control_mpage); 2229 } 2230 2231 /** 2232 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2233 * @buf: output buffer 2234 * @changeable: whether changeable parameters are requested 2235 * 2236 * Generate a generic MODE SENSE r/w error recovery page. 2237 * 2238 * LOCKING: 2239 * None. 2240 */ 2241 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2242 { 2243 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2244 changeable); 2245 return sizeof(def_rw_recovery_mpage); 2246 } 2247 2248 /** 2249 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2250 * @args: device IDENTIFY data / SCSI command of interest. 2251 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2252 * 2253 * Simulate MODE SENSE commands. Assume this is invoked for direct 2254 * access devices (e.g. disks) only. There should be no block 2255 * descriptor for other device types. 2256 * 2257 * LOCKING: 2258 * spin_lock_irqsave(host lock) 2259 */ 2260 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2261 { 2262 struct ata_device *dev = args->dev; 2263 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2264 static const u8 sat_blk_desc[] = { 2265 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2266 0, 2267 0, 0x2, 0x0 /* block length: 512 bytes */ 2268 }; 2269 u8 pg, spg; 2270 unsigned int ebd, page_control, six_byte; 2271 u8 dpofua = 0, bp = 0xff; 2272 u16 fp; 2273 2274 six_byte = (scsicmd[0] == MODE_SENSE); 2275 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2276 /* 2277 * LLBA bit in msense(10) ignored (compliant) 2278 */ 2279 2280 page_control = scsicmd[2] >> 6; 2281 switch (page_control) { 2282 case 0: /* current */ 2283 case 1: /* changeable */ 2284 case 2: /* defaults */ 2285 break; /* supported */ 2286 case 3: /* saved */ 2287 goto saving_not_supp; 2288 default: 2289 fp = 2; 2290 bp = 6; 2291 goto invalid_fld; 2292 } 2293 2294 if (six_byte) 2295 p += 4 + (ebd ? 8 : 0); 2296 else 2297 p += 8 + (ebd ? 8 : 0); 2298 2299 pg = scsicmd[2] & 0x3f; 2300 spg = scsicmd[3]; 2301 /* 2302 * No mode subpages supported (yet) but asking for _all_ 2303 * subpages may be valid 2304 */ 2305 if (spg && (spg != ALL_SUB_MPAGES)) { 2306 fp = 3; 2307 goto invalid_fld; 2308 } 2309 2310 switch(pg) { 2311 case RW_RECOVERY_MPAGE: 2312 p += ata_msense_rw_recovery(p, page_control == 1); 2313 break; 2314 2315 case CACHE_MPAGE: 2316 p += ata_msense_caching(args->id, p, page_control == 1); 2317 break; 2318 2319 case CONTROL_MPAGE: 2320 p += ata_msense_control(args->dev, p, page_control == 1); 2321 break; 2322 2323 case ALL_MPAGES: 2324 p += ata_msense_rw_recovery(p, page_control == 1); 2325 p += ata_msense_caching(args->id, p, page_control == 1); 2326 p += ata_msense_control(args->dev, p, page_control == 1); 2327 break; 2328 2329 default: /* invalid page code */ 2330 fp = 2; 2331 goto invalid_fld; 2332 } 2333 2334 if (dev->flags & ATA_DFLAG_FUA) 2335 dpofua = 1 << 4; 2336 2337 if (six_byte) { 2338 rbuf[0] = p - rbuf - 1; 2339 rbuf[2] |= dpofua; 2340 if (ebd) { 2341 rbuf[3] = sizeof(sat_blk_desc); 2342 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2343 } 2344 } else { 2345 unsigned int output_len = p - rbuf - 2; 2346 2347 rbuf[0] = output_len >> 8; 2348 rbuf[1] = output_len; 2349 rbuf[3] |= dpofua; 2350 if (ebd) { 2351 rbuf[7] = sizeof(sat_blk_desc); 2352 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2353 } 2354 } 2355 return 0; 2356 2357 invalid_fld: 2358 ata_scsi_set_invalid_field(dev, args->cmd, fp, bp); 2359 return 1; 2360 2361 saving_not_supp: 2362 ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2363 /* "Saving parameters not supported" */ 2364 return 1; 2365 } 2366 2367 /** 2368 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2369 * @args: device IDENTIFY data / SCSI command of interest. 2370 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2371 * 2372 * Simulate READ CAPACITY commands. 2373 * 2374 * LOCKING: 2375 * None. 2376 */ 2377 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2378 { 2379 struct ata_device *dev = args->dev; 2380 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2381 u32 sector_size; /* physical sector size in bytes */ 2382 u8 log2_per_phys; 2383 u16 lowest_aligned; 2384 2385 sector_size = ata_id_logical_sector_size(dev->id); 2386 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2387 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2388 2389 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2390 if (last_lba >= 0xffffffffULL) 2391 last_lba = 0xffffffff; 2392 2393 /* sector count, 32-bit */ 2394 rbuf[0] = last_lba >> (8 * 3); 2395 rbuf[1] = last_lba >> (8 * 2); 2396 rbuf[2] = last_lba >> (8 * 1); 2397 rbuf[3] = last_lba; 2398 2399 /* sector size */ 2400 rbuf[4] = sector_size >> (8 * 3); 2401 rbuf[5] = sector_size >> (8 * 2); 2402 rbuf[6] = sector_size >> (8 * 1); 2403 rbuf[7] = sector_size; 2404 } else { 2405 /* sector count, 64-bit */ 2406 rbuf[0] = last_lba >> (8 * 7); 2407 rbuf[1] = last_lba >> (8 * 6); 2408 rbuf[2] = last_lba >> (8 * 5); 2409 rbuf[3] = last_lba >> (8 * 4); 2410 rbuf[4] = last_lba >> (8 * 3); 2411 rbuf[5] = last_lba >> (8 * 2); 2412 rbuf[6] = last_lba >> (8 * 1); 2413 rbuf[7] = last_lba; 2414 2415 /* sector size */ 2416 rbuf[ 8] = sector_size >> (8 * 3); 2417 rbuf[ 9] = sector_size >> (8 * 2); 2418 rbuf[10] = sector_size >> (8 * 1); 2419 rbuf[11] = sector_size; 2420 2421 rbuf[12] = 0; 2422 rbuf[13] = log2_per_phys; 2423 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2424 rbuf[15] = lowest_aligned; 2425 2426 if (ata_id_has_trim(args->id) && 2427 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2428 rbuf[14] |= 0x80; /* LBPME */ 2429 2430 if (ata_id_has_zero_after_trim(args->id) && 2431 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2432 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2433 rbuf[14] |= 0x40; /* LBPRZ */ 2434 } 2435 } 2436 if (ata_id_zoned_cap(args->id) || 2437 args->dev->class == ATA_DEV_ZAC) 2438 rbuf[12] = (1 << 4); /* RC_BASIS */ 2439 } 2440 return 0; 2441 } 2442 2443 /** 2444 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2445 * @args: device IDENTIFY data / SCSI command of interest. 2446 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2447 * 2448 * Simulate REPORT LUNS command. 2449 * 2450 * LOCKING: 2451 * spin_lock_irqsave(host lock) 2452 */ 2453 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2454 { 2455 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2456 2457 return 0; 2458 } 2459 2460 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2461 { 2462 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2463 /* FIXME: not quite right; we don't want the 2464 * translation of taskfile registers into 2465 * a sense descriptors, since that's only 2466 * correct for ATA, not ATAPI 2467 */ 2468 ata_gen_passthru_sense(qc); 2469 } 2470 2471 ata_qc_done(qc); 2472 } 2473 2474 /* is it pointless to prefer PIO for "safety reasons"? */ 2475 static inline int ata_pio_use_silly(struct ata_port *ap) 2476 { 2477 return (ap->flags & ATA_FLAG_PIO_DMA); 2478 } 2479 2480 static void atapi_request_sense(struct ata_queued_cmd *qc) 2481 { 2482 struct ata_port *ap = qc->ap; 2483 struct scsi_cmnd *cmd = qc->scsicmd; 2484 2485 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2486 2487 #ifdef CONFIG_ATA_SFF 2488 if (ap->ops->sff_tf_read) 2489 ap->ops->sff_tf_read(ap, &qc->tf); 2490 #endif 2491 2492 /* fill these in, for the case where they are -not- overwritten */ 2493 cmd->sense_buffer[0] = 0x70; 2494 cmd->sense_buffer[2] = qc->tf.error >> 4; 2495 2496 ata_qc_reinit(qc); 2497 2498 /* setup sg table and init transfer direction */ 2499 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2500 ata_sg_init(qc, &qc->sgent, 1); 2501 qc->dma_dir = DMA_FROM_DEVICE; 2502 2503 memset(&qc->cdb, 0, qc->dev->cdb_len); 2504 qc->cdb[0] = REQUEST_SENSE; 2505 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2506 2507 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2508 qc->tf.command = ATA_CMD_PACKET; 2509 2510 if (ata_pio_use_silly(ap)) { 2511 qc->tf.protocol = ATAPI_PROT_DMA; 2512 qc->tf.feature |= ATAPI_PKT_DMA; 2513 } else { 2514 qc->tf.protocol = ATAPI_PROT_PIO; 2515 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2516 qc->tf.lbah = 0; 2517 } 2518 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2519 2520 qc->complete_fn = atapi_sense_complete; 2521 2522 ata_qc_issue(qc); 2523 } 2524 2525 /* 2526 * ATAPI devices typically report zero for their SCSI version, and sometimes 2527 * deviate from the spec WRT response data format. If SCSI version is 2528 * reported as zero like normal, then we make the following fixups: 2529 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a 2530 * modern device. 2531 * 2) Ensure response data format / ATAPI information are always correct. 2532 */ 2533 static void atapi_fixup_inquiry(struct scsi_cmnd *cmd) 2534 { 2535 u8 buf[4]; 2536 2537 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2538 if (buf[2] == 0) { 2539 buf[2] = 0x5; 2540 buf[3] = 0x32; 2541 } 2542 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2543 } 2544 2545 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2546 { 2547 struct scsi_cmnd *cmd = qc->scsicmd; 2548 unsigned int err_mask = qc->err_mask; 2549 2550 /* handle completion from new EH */ 2551 if (unlikely(qc->ap->ops->error_handler && 2552 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2553 2554 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2555 /* FIXME: not quite right; we don't want the 2556 * translation of taskfile registers into a 2557 * sense descriptors, since that's only 2558 * correct for ATA, not ATAPI 2559 */ 2560 ata_gen_passthru_sense(qc); 2561 } 2562 2563 /* SCSI EH automatically locks door if sdev->locked is 2564 * set. Sometimes door lock request continues to 2565 * fail, for example, when no media is present. This 2566 * creates a loop - SCSI EH issues door lock which 2567 * fails and gets invoked again to acquire sense data 2568 * for the failed command. 2569 * 2570 * If door lock fails, always clear sdev->locked to 2571 * avoid this infinite loop. 2572 * 2573 * This may happen before SCSI scan is complete. Make 2574 * sure qc->dev->sdev isn't NULL before dereferencing. 2575 */ 2576 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2577 qc->dev->sdev->locked = 0; 2578 2579 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2580 ata_qc_done(qc); 2581 return; 2582 } 2583 2584 /* successful completion or old EH failure path */ 2585 if (unlikely(err_mask & AC_ERR_DEV)) { 2586 cmd->result = SAM_STAT_CHECK_CONDITION; 2587 atapi_request_sense(qc); 2588 return; 2589 } else if (unlikely(err_mask)) { 2590 /* FIXME: not quite right; we don't want the 2591 * translation of taskfile registers into 2592 * a sense descriptors, since that's only 2593 * correct for ATA, not ATAPI 2594 */ 2595 ata_gen_passthru_sense(qc); 2596 } else { 2597 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0) 2598 atapi_fixup_inquiry(cmd); 2599 cmd->result = SAM_STAT_GOOD; 2600 } 2601 2602 ata_qc_done(qc); 2603 } 2604 /** 2605 * atapi_xlat - Initialize PACKET taskfile 2606 * @qc: command structure to be initialized 2607 * 2608 * LOCKING: 2609 * spin_lock_irqsave(host lock) 2610 * 2611 * RETURNS: 2612 * Zero on success, non-zero on failure. 2613 */ 2614 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2615 { 2616 struct scsi_cmnd *scmd = qc->scsicmd; 2617 struct ata_device *dev = qc->dev; 2618 int nodata = (scmd->sc_data_direction == DMA_NONE); 2619 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2620 unsigned int nbytes; 2621 2622 memset(qc->cdb, 0, dev->cdb_len); 2623 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2624 2625 qc->complete_fn = atapi_qc_complete; 2626 2627 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2628 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2629 qc->tf.flags |= ATA_TFLAG_WRITE; 2630 } 2631 2632 qc->tf.command = ATA_CMD_PACKET; 2633 ata_qc_set_pc_nbytes(qc); 2634 2635 /* check whether ATAPI DMA is safe */ 2636 if (!nodata && !using_pio && atapi_check_dma(qc)) 2637 using_pio = 1; 2638 2639 /* Some controller variants snoop this value for Packet 2640 * transfers to do state machine and FIFO management. Thus we 2641 * want to set it properly, and for DMA where it is 2642 * effectively meaningless. 2643 */ 2644 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2645 2646 /* Most ATAPI devices which honor transfer chunk size don't 2647 * behave according to the spec when odd chunk size which 2648 * matches the transfer length is specified. If the number of 2649 * bytes to transfer is 2n+1. According to the spec, what 2650 * should happen is to indicate that 2n+1 is going to be 2651 * transferred and transfer 2n+2 bytes where the last byte is 2652 * padding. 2653 * 2654 * In practice, this doesn't happen. ATAPI devices first 2655 * indicate and transfer 2n bytes and then indicate and 2656 * transfer 2 bytes where the last byte is padding. 2657 * 2658 * This inconsistency confuses several controllers which 2659 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2660 * These controllers use actual number of transferred bytes to 2661 * update DMA pointer and transfer of 4n+2 bytes make those 2662 * controller push DMA pointer by 4n+4 bytes because SATA data 2663 * FISes are aligned to 4 bytes. This causes data corruption 2664 * and buffer overrun. 2665 * 2666 * Always setting nbytes to even number solves this problem 2667 * because then ATAPI devices don't have to split data at 2n 2668 * boundaries. 2669 */ 2670 if (nbytes & 0x1) 2671 nbytes++; 2672 2673 qc->tf.lbam = (nbytes & 0xFF); 2674 qc->tf.lbah = (nbytes >> 8); 2675 2676 if (nodata) 2677 qc->tf.protocol = ATAPI_PROT_NODATA; 2678 else if (using_pio) 2679 qc->tf.protocol = ATAPI_PROT_PIO; 2680 else { 2681 /* DMA data xfer */ 2682 qc->tf.protocol = ATAPI_PROT_DMA; 2683 qc->tf.feature |= ATAPI_PKT_DMA; 2684 2685 if ((dev->flags & ATA_DFLAG_DMADIR) && 2686 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2687 /* some SATA bridges need us to indicate data xfer direction */ 2688 qc->tf.feature |= ATAPI_DMADIR; 2689 } 2690 2691 2692 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2693 as ATAPI tape drives don't get this right otherwise */ 2694 return 0; 2695 } 2696 2697 static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno) 2698 { 2699 /* 2700 * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case), 2701 * or 2 (IDE master + slave case). However, the former case includes 2702 * libsas hosted devices which are numbered per scsi host, leading 2703 * to devno potentially being larger than 0 but with each struct 2704 * ata_device having its own struct ata_port and struct ata_link. 2705 * To accommodate these, ignore devno and always use device number 0. 2706 */ 2707 if (likely(!sata_pmp_attached(ap))) { 2708 int link_max_devices = ata_link_max_devices(&ap->link); 2709 2710 if (link_max_devices == 1) 2711 return &ap->link.device[0]; 2712 2713 if (devno < link_max_devices) 2714 return &ap->link.device[devno]; 2715 2716 return NULL; 2717 } 2718 2719 /* 2720 * For PMP-attached devices, the device number corresponds to C 2721 * (channel) of SCSI [H:C:I:L], indicating the port pmp link 2722 * for the device. 2723 */ 2724 if (devno < ap->nr_pmp_links) 2725 return &ap->pmp_link[devno].device[0]; 2726 2727 return NULL; 2728 } 2729 2730 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2731 const struct scsi_device *scsidev) 2732 { 2733 int devno; 2734 2735 /* skip commands not addressed to targets we simulate */ 2736 if (!sata_pmp_attached(ap)) { 2737 if (unlikely(scsidev->channel || scsidev->lun)) 2738 return NULL; 2739 devno = scsidev->id; 2740 } else { 2741 if (unlikely(scsidev->id || scsidev->lun)) 2742 return NULL; 2743 devno = scsidev->channel; 2744 } 2745 2746 return ata_find_dev(ap, devno); 2747 } 2748 2749 /** 2750 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2751 * @ap: ATA port to which the device is attached 2752 * @scsidev: SCSI device from which we derive the ATA device 2753 * 2754 * Given various information provided in struct scsi_cmnd, 2755 * map that onto an ATA bus, and using that mapping 2756 * determine which ata_device is associated with the 2757 * SCSI command to be sent. 2758 * 2759 * LOCKING: 2760 * spin_lock_irqsave(host lock) 2761 * 2762 * RETURNS: 2763 * Associated ATA device, or %NULL if not found. 2764 */ 2765 struct ata_device * 2766 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2767 { 2768 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2769 2770 if (unlikely(!dev || !ata_dev_enabled(dev))) 2771 return NULL; 2772 2773 return dev; 2774 } 2775 2776 /* 2777 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2778 * @byte1: Byte 1 from pass-thru CDB. 2779 * 2780 * RETURNS: 2781 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2782 */ 2783 static u8 2784 ata_scsi_map_proto(u8 byte1) 2785 { 2786 switch((byte1 & 0x1e) >> 1) { 2787 case 3: /* Non-data */ 2788 return ATA_PROT_NODATA; 2789 2790 case 6: /* DMA */ 2791 case 10: /* UDMA Data-in */ 2792 case 11: /* UDMA Data-Out */ 2793 return ATA_PROT_DMA; 2794 2795 case 4: /* PIO Data-in */ 2796 case 5: /* PIO Data-out */ 2797 return ATA_PROT_PIO; 2798 2799 case 12: /* FPDMA */ 2800 return ATA_PROT_NCQ; 2801 2802 case 0: /* Hard Reset */ 2803 case 1: /* SRST */ 2804 case 8: /* Device Diagnostic */ 2805 case 9: /* Device Reset */ 2806 case 7: /* DMA Queued */ 2807 case 15: /* Return Response Info */ 2808 default: /* Reserved */ 2809 break; 2810 } 2811 2812 return ATA_PROT_UNKNOWN; 2813 } 2814 2815 /** 2816 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2817 * @qc: command structure to be initialized 2818 * 2819 * Handles either 12, 16, or 32-byte versions of the CDB. 2820 * 2821 * RETURNS: 2822 * Zero on success, non-zero on failure. 2823 */ 2824 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2825 { 2826 struct ata_taskfile *tf = &(qc->tf); 2827 struct scsi_cmnd *scmd = qc->scsicmd; 2828 struct ata_device *dev = qc->dev; 2829 const u8 *cdb = scmd->cmnd; 2830 u16 fp; 2831 u16 cdb_offset = 0; 2832 2833 /* 7Fh variable length cmd means a ata pass-thru(32) */ 2834 if (cdb[0] == VARIABLE_LENGTH_CMD) 2835 cdb_offset = 9; 2836 2837 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]); 2838 if (tf->protocol == ATA_PROT_UNKNOWN) { 2839 fp = 1; 2840 goto invalid_fld; 2841 } 2842 2843 if ((cdb[2 + cdb_offset] & 0x3) == 0) { 2844 /* 2845 * When T_LENGTH is zero (No data is transferred), dir should 2846 * be DMA_NONE. 2847 */ 2848 if (scmd->sc_data_direction != DMA_NONE) { 2849 fp = 2 + cdb_offset; 2850 goto invalid_fld; 2851 } 2852 2853 if (ata_is_ncq(tf->protocol)) 2854 tf->protocol = ATA_PROT_NCQ_NODATA; 2855 } 2856 2857 /* enable LBA */ 2858 tf->flags |= ATA_TFLAG_LBA; 2859 2860 /* 2861 * 12 and 16 byte CDBs use different offsets to 2862 * provide the various register values. 2863 */ 2864 switch (cdb[0]) { 2865 case ATA_16: 2866 /* 2867 * 16-byte CDB - may contain extended commands. 2868 * 2869 * If that is the case, copy the upper byte register values. 2870 */ 2871 if (cdb[1] & 0x01) { 2872 tf->hob_feature = cdb[3]; 2873 tf->hob_nsect = cdb[5]; 2874 tf->hob_lbal = cdb[7]; 2875 tf->hob_lbam = cdb[9]; 2876 tf->hob_lbah = cdb[11]; 2877 tf->flags |= ATA_TFLAG_LBA48; 2878 } else 2879 tf->flags &= ~ATA_TFLAG_LBA48; 2880 2881 /* 2882 * Always copy low byte, device and command registers. 2883 */ 2884 tf->feature = cdb[4]; 2885 tf->nsect = cdb[6]; 2886 tf->lbal = cdb[8]; 2887 tf->lbam = cdb[10]; 2888 tf->lbah = cdb[12]; 2889 tf->device = cdb[13]; 2890 tf->command = cdb[14]; 2891 break; 2892 case ATA_12: 2893 /* 2894 * 12-byte CDB - incapable of extended commands. 2895 */ 2896 tf->flags &= ~ATA_TFLAG_LBA48; 2897 2898 tf->feature = cdb[3]; 2899 tf->nsect = cdb[4]; 2900 tf->lbal = cdb[5]; 2901 tf->lbam = cdb[6]; 2902 tf->lbah = cdb[7]; 2903 tf->device = cdb[8]; 2904 tf->command = cdb[9]; 2905 break; 2906 default: 2907 /* 2908 * 32-byte CDB - may contain extended command fields. 2909 * 2910 * If that is the case, copy the upper byte register values. 2911 */ 2912 if (cdb[10] & 0x01) { 2913 tf->hob_feature = cdb[20]; 2914 tf->hob_nsect = cdb[22]; 2915 tf->hob_lbal = cdb[16]; 2916 tf->hob_lbam = cdb[15]; 2917 tf->hob_lbah = cdb[14]; 2918 tf->flags |= ATA_TFLAG_LBA48; 2919 } else 2920 tf->flags &= ~ATA_TFLAG_LBA48; 2921 2922 tf->feature = cdb[21]; 2923 tf->nsect = cdb[23]; 2924 tf->lbal = cdb[19]; 2925 tf->lbam = cdb[18]; 2926 tf->lbah = cdb[17]; 2927 tf->device = cdb[24]; 2928 tf->command = cdb[25]; 2929 tf->auxiliary = get_unaligned_be32(&cdb[28]); 2930 break; 2931 } 2932 2933 /* For NCQ commands copy the tag value */ 2934 if (ata_is_ncq(tf->protocol)) 2935 tf->nsect = qc->hw_tag << 3; 2936 2937 /* enforce correct master/slave bit */ 2938 tf->device = dev->devno ? 2939 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2940 2941 switch (tf->command) { 2942 /* READ/WRITE LONG use a non-standard sect_size */ 2943 case ATA_CMD_READ_LONG: 2944 case ATA_CMD_READ_LONG_ONCE: 2945 case ATA_CMD_WRITE_LONG: 2946 case ATA_CMD_WRITE_LONG_ONCE: 2947 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) { 2948 fp = 1; 2949 goto invalid_fld; 2950 } 2951 qc->sect_size = scsi_bufflen(scmd); 2952 break; 2953 2954 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2955 case ATA_CMD_CFA_WRITE_NE: 2956 case ATA_CMD_CFA_TRANS_SECT: 2957 case ATA_CMD_CFA_WRITE_MULT_NE: 2958 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2959 case ATA_CMD_READ: 2960 case ATA_CMD_READ_EXT: 2961 case ATA_CMD_READ_QUEUED: 2962 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2963 case ATA_CMD_FPDMA_READ: 2964 case ATA_CMD_READ_MULTI: 2965 case ATA_CMD_READ_MULTI_EXT: 2966 case ATA_CMD_PIO_READ: 2967 case ATA_CMD_PIO_READ_EXT: 2968 case ATA_CMD_READ_STREAM_DMA_EXT: 2969 case ATA_CMD_READ_STREAM_EXT: 2970 case ATA_CMD_VERIFY: 2971 case ATA_CMD_VERIFY_EXT: 2972 case ATA_CMD_WRITE: 2973 case ATA_CMD_WRITE_EXT: 2974 case ATA_CMD_WRITE_FUA_EXT: 2975 case ATA_CMD_WRITE_QUEUED: 2976 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2977 case ATA_CMD_FPDMA_WRITE: 2978 case ATA_CMD_WRITE_MULTI: 2979 case ATA_CMD_WRITE_MULTI_EXT: 2980 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2981 case ATA_CMD_PIO_WRITE: 2982 case ATA_CMD_PIO_WRITE_EXT: 2983 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2984 case ATA_CMD_WRITE_STREAM_EXT: 2985 qc->sect_size = scmd->device->sector_size; 2986 break; 2987 2988 /* Everything else uses 512 byte "sectors" */ 2989 default: 2990 qc->sect_size = ATA_SECT_SIZE; 2991 } 2992 2993 /* 2994 * Set flags so that all registers will be written, pass on 2995 * write indication (used for PIO/DMA setup), result TF is 2996 * copied back and we don't whine too much about its failure. 2997 */ 2998 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2999 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3000 tf->flags |= ATA_TFLAG_WRITE; 3001 3002 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3003 3004 /* 3005 * Set transfer length. 3006 * 3007 * TODO: find out if we need to do more here to 3008 * cover scatter/gather case. 3009 */ 3010 ata_qc_set_pc_nbytes(qc); 3011 3012 /* We may not issue DMA commands if no DMA mode is set */ 3013 if (tf->protocol == ATA_PROT_DMA && !ata_dma_enabled(dev)) { 3014 fp = 1; 3015 goto invalid_fld; 3016 } 3017 3018 /* We may not issue NCQ commands to devices not supporting NCQ */ 3019 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) { 3020 fp = 1; 3021 goto invalid_fld; 3022 } 3023 3024 /* sanity check for pio multi commands */ 3025 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) { 3026 fp = 1; 3027 goto invalid_fld; 3028 } 3029 3030 if (is_multi_taskfile(tf)) { 3031 unsigned int multi_count = 1 << (cdb[1] >> 5); 3032 3033 /* compare the passed through multi_count 3034 * with the cached multi_count of libata 3035 */ 3036 if (multi_count != dev->multi_count) 3037 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3038 multi_count); 3039 } 3040 3041 /* 3042 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3043 * SET_FEATURES - XFER MODE must be preceded/succeeded 3044 * by an update to hardware-specific registers for each 3045 * controller (i.e. the reason for ->set_piomode(), 3046 * ->set_dmamode(), and ->post_set_mode() hooks). 3047 */ 3048 if (tf->command == ATA_CMD_SET_FEATURES && 3049 tf->feature == SETFEATURES_XFER) { 3050 fp = (cdb[0] == ATA_16) ? 4 : 3; 3051 goto invalid_fld; 3052 } 3053 3054 /* 3055 * Filter TPM commands by default. These provide an 3056 * essentially uncontrolled encrypted "back door" between 3057 * applications and the disk. Set libata.allow_tpm=1 if you 3058 * have a real reason for wanting to use them. This ensures 3059 * that installed software cannot easily mess stuff up without 3060 * user intent. DVR type users will probably ship with this enabled 3061 * for movie content management. 3062 * 3063 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3064 * for this and should do in future but that it is not sufficient as 3065 * DCS is an optional feature set. Thus we also do the software filter 3066 * so that we comply with the TC consortium stated goal that the user 3067 * can turn off TC features of their system. 3068 */ 3069 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) { 3070 fp = (cdb[0] == ATA_16) ? 14 : 9; 3071 goto invalid_fld; 3072 } 3073 3074 return 0; 3075 3076 invalid_fld: 3077 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff); 3078 return 1; 3079 } 3080 3081 /** 3082 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim 3083 * @cmd: SCSI command being translated 3084 * @trmax: Maximum number of entries that will fit in sector_size bytes. 3085 * @sector: Starting sector 3086 * @count: Total Range of request in logical sectors 3087 * 3088 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted 3089 * descriptor. 3090 * 3091 * Upto 64 entries of the format: 3092 * 63:48 Range Length 3093 * 47:0 LBA 3094 * 3095 * Range Length of 0 is ignored. 3096 * LBA's should be sorted order and not overlap. 3097 * 3098 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET 3099 * 3100 * Return: Number of bytes copied into sglist. 3101 */ 3102 static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax, 3103 u64 sector, u32 count) 3104 { 3105 struct scsi_device *sdp = cmd->device; 3106 size_t len = sdp->sector_size; 3107 size_t r; 3108 __le64 *buf; 3109 u32 i = 0; 3110 unsigned long flags; 3111 3112 WARN_ON(len > ATA_SCSI_RBUF_SIZE); 3113 3114 if (len > ATA_SCSI_RBUF_SIZE) 3115 len = ATA_SCSI_RBUF_SIZE; 3116 3117 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 3118 buf = ((void *)ata_scsi_rbuf); 3119 memset(buf, 0, len); 3120 while (i < trmax) { 3121 u64 entry = sector | 3122 ((u64)(count > 0xffff ? 0xffff : count) << 48); 3123 buf[i++] = __cpu_to_le64(entry); 3124 if (count <= 0xffff) 3125 break; 3126 count -= 0xffff; 3127 sector += 0xffff; 3128 } 3129 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len); 3130 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 3131 3132 return r; 3133 } 3134 3135 /** 3136 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same 3137 * @qc: Command to be translated 3138 * 3139 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or 3140 * an SCT Write Same command. 3141 * Based on WRITE SAME has the UNMAP flag: 3142 * 3143 * - When set translate to DSM TRIM 3144 * - When clear translate to SCT Write Same 3145 */ 3146 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3147 { 3148 struct ata_taskfile *tf = &qc->tf; 3149 struct scsi_cmnd *scmd = qc->scsicmd; 3150 struct scsi_device *sdp = scmd->device; 3151 size_t len = sdp->sector_size; 3152 struct ata_device *dev = qc->dev; 3153 const u8 *cdb = scmd->cmnd; 3154 u64 block; 3155 u32 n_block; 3156 const u32 trmax = len >> 3; 3157 u32 size; 3158 u16 fp; 3159 u8 bp = 0xff; 3160 u8 unmap = cdb[1] & 0x8; 3161 3162 /* we may not issue DMA commands if no DMA mode is set */ 3163 if (unlikely(!ata_dma_enabled(dev))) 3164 goto invalid_opcode; 3165 3166 /* 3167 * We only allow sending this command through the block layer, 3168 * as it modifies the DATA OUT buffer, which would corrupt user 3169 * memory for SG_IO commands. 3170 */ 3171 if (unlikely(blk_rq_is_passthrough(scsi_cmd_to_rq(scmd)))) 3172 goto invalid_opcode; 3173 3174 if (unlikely(scmd->cmd_len < 16)) { 3175 fp = 15; 3176 goto invalid_fld; 3177 } 3178 scsi_16_lba_len(cdb, &block, &n_block); 3179 3180 if (!unmap || 3181 (dev->horkage & ATA_HORKAGE_NOTRIM) || 3182 !ata_id_has_trim(dev->id)) { 3183 fp = 1; 3184 bp = 3; 3185 goto invalid_fld; 3186 } 3187 /* If the request is too large the cmd is invalid */ 3188 if (n_block > 0xffff * trmax) { 3189 fp = 2; 3190 goto invalid_fld; 3191 } 3192 3193 /* 3194 * WRITE SAME always has a sector sized buffer as payload, this 3195 * should never be a multiple entry S/G list. 3196 */ 3197 if (!scsi_sg_count(scmd)) 3198 goto invalid_param_len; 3199 3200 /* 3201 * size must match sector size in bytes 3202 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count) 3203 * is defined as number of 512 byte blocks to be transferred. 3204 */ 3205 3206 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); 3207 if (size != len) 3208 goto invalid_param_len; 3209 3210 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3211 /* Newer devices support queued TRIM commands */ 3212 tf->protocol = ATA_PROT_NCQ; 3213 tf->command = ATA_CMD_FPDMA_SEND; 3214 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3215 tf->nsect = qc->hw_tag << 3; 3216 tf->hob_feature = (size / 512) >> 8; 3217 tf->feature = size / 512; 3218 3219 tf->auxiliary = 1; 3220 } else { 3221 tf->protocol = ATA_PROT_DMA; 3222 tf->hob_feature = 0; 3223 tf->feature = ATA_DSM_TRIM; 3224 tf->hob_nsect = (size / 512) >> 8; 3225 tf->nsect = size / 512; 3226 tf->command = ATA_CMD_DSM; 3227 } 3228 3229 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3230 ATA_TFLAG_WRITE; 3231 3232 ata_qc_set_pc_nbytes(qc); 3233 3234 return 0; 3235 3236 invalid_fld: 3237 ata_scsi_set_invalid_field(dev, scmd, fp, bp); 3238 return 1; 3239 invalid_param_len: 3240 /* "Parameter list length error" */ 3241 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3242 return 1; 3243 invalid_opcode: 3244 /* "Invalid command operation code" */ 3245 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0); 3246 return 1; 3247 } 3248 3249 /** 3250 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN 3251 * @args: device MAINTENANCE_IN data / SCSI command of interest. 3252 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 3253 * 3254 * Yields a subset to satisfy scsi_report_opcode() 3255 * 3256 * LOCKING: 3257 * spin_lock_irqsave(host lock) 3258 */ 3259 static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf) 3260 { 3261 struct ata_device *dev = args->dev; 3262 u8 *cdb = args->cmd->cmnd; 3263 u8 supported = 0; 3264 unsigned int err = 0; 3265 3266 if (cdb[2] != 1 && cdb[2] != 3) { 3267 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]); 3268 err = 2; 3269 goto out; 3270 } 3271 3272 switch (cdb[3]) { 3273 case INQUIRY: 3274 case MODE_SENSE: 3275 case MODE_SENSE_10: 3276 case READ_CAPACITY: 3277 case SERVICE_ACTION_IN_16: 3278 case REPORT_LUNS: 3279 case REQUEST_SENSE: 3280 case SYNCHRONIZE_CACHE: 3281 case SYNCHRONIZE_CACHE_16: 3282 case REZERO_UNIT: 3283 case SEEK_6: 3284 case SEEK_10: 3285 case TEST_UNIT_READY: 3286 case SEND_DIAGNOSTIC: 3287 case MAINTENANCE_IN: 3288 case READ_6: 3289 case READ_10: 3290 case READ_16: 3291 case WRITE_6: 3292 case WRITE_10: 3293 case WRITE_16: 3294 case ATA_12: 3295 case ATA_16: 3296 case VERIFY: 3297 case VERIFY_16: 3298 case MODE_SELECT: 3299 case MODE_SELECT_10: 3300 case START_STOP: 3301 supported = 3; 3302 break; 3303 case ZBC_IN: 3304 case ZBC_OUT: 3305 if (ata_id_zoned_cap(dev->id) || 3306 dev->class == ATA_DEV_ZAC) 3307 supported = 3; 3308 break; 3309 case SECURITY_PROTOCOL_IN: 3310 case SECURITY_PROTOCOL_OUT: 3311 if (dev->flags & ATA_DFLAG_TRUSTED) 3312 supported = 3; 3313 break; 3314 default: 3315 break; 3316 } 3317 out: 3318 rbuf[1] = supported; /* supported */ 3319 return err; 3320 } 3321 3322 /** 3323 * ata_scsi_report_zones_complete - convert ATA output 3324 * @qc: command structure returning the data 3325 * 3326 * Convert T-13 little-endian field representation into 3327 * T-10 big-endian field representation. 3328 * What a mess. 3329 */ 3330 static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc) 3331 { 3332 struct scsi_cmnd *scmd = qc->scsicmd; 3333 struct sg_mapping_iter miter; 3334 unsigned long flags; 3335 unsigned int bytes = 0; 3336 3337 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd), 3338 SG_MITER_TO_SG | SG_MITER_ATOMIC); 3339 3340 local_irq_save(flags); 3341 while (sg_miter_next(&miter)) { 3342 unsigned int offset = 0; 3343 3344 if (bytes == 0) { 3345 char *hdr; 3346 u32 list_length; 3347 u64 max_lba, opt_lba; 3348 u16 same; 3349 3350 /* Swizzle header */ 3351 hdr = miter.addr; 3352 list_length = get_unaligned_le32(&hdr[0]); 3353 same = get_unaligned_le16(&hdr[4]); 3354 max_lba = get_unaligned_le64(&hdr[8]); 3355 opt_lba = get_unaligned_le64(&hdr[16]); 3356 put_unaligned_be32(list_length, &hdr[0]); 3357 hdr[4] = same & 0xf; 3358 put_unaligned_be64(max_lba, &hdr[8]); 3359 put_unaligned_be64(opt_lba, &hdr[16]); 3360 offset += 64; 3361 bytes += 64; 3362 } 3363 while (offset < miter.length) { 3364 char *rec; 3365 u8 cond, type, non_seq, reset; 3366 u64 size, start, wp; 3367 3368 /* Swizzle zone descriptor */ 3369 rec = miter.addr + offset; 3370 type = rec[0] & 0xf; 3371 cond = (rec[1] >> 4) & 0xf; 3372 non_seq = (rec[1] & 2); 3373 reset = (rec[1] & 1); 3374 size = get_unaligned_le64(&rec[8]); 3375 start = get_unaligned_le64(&rec[16]); 3376 wp = get_unaligned_le64(&rec[24]); 3377 rec[0] = type; 3378 rec[1] = (cond << 4) | non_seq | reset; 3379 put_unaligned_be64(size, &rec[8]); 3380 put_unaligned_be64(start, &rec[16]); 3381 put_unaligned_be64(wp, &rec[24]); 3382 WARN_ON(offset + 64 > miter.length); 3383 offset += 64; 3384 bytes += 64; 3385 } 3386 } 3387 sg_miter_stop(&miter); 3388 local_irq_restore(flags); 3389 3390 ata_scsi_qc_complete(qc); 3391 } 3392 3393 static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc) 3394 { 3395 struct ata_taskfile *tf = &qc->tf; 3396 struct scsi_cmnd *scmd = qc->scsicmd; 3397 const u8 *cdb = scmd->cmnd; 3398 u16 sect, fp = (u16)-1; 3399 u8 sa, options, bp = 0xff; 3400 u64 block; 3401 u32 n_block; 3402 3403 if (unlikely(scmd->cmd_len < 16)) { 3404 ata_dev_warn(qc->dev, "invalid cdb length %d\n", 3405 scmd->cmd_len); 3406 fp = 15; 3407 goto invalid_fld; 3408 } 3409 scsi_16_lba_len(cdb, &block, &n_block); 3410 if (n_block != scsi_bufflen(scmd)) { 3411 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n", 3412 n_block, scsi_bufflen(scmd)); 3413 goto invalid_param_len; 3414 } 3415 sa = cdb[1] & 0x1f; 3416 if (sa != ZI_REPORT_ZONES) { 3417 ata_dev_warn(qc->dev, "invalid service action %d\n", sa); 3418 fp = 1; 3419 goto invalid_fld; 3420 } 3421 /* 3422 * ZAC allows only for transfers in 512 byte blocks, 3423 * and uses a 16 bit value for the transfer count. 3424 */ 3425 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) { 3426 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block); 3427 goto invalid_param_len; 3428 } 3429 sect = n_block / 512; 3430 options = cdb[14] & 0xbf; 3431 3432 if (ata_ncq_enabled(qc->dev) && 3433 ata_fpdma_zac_mgmt_in_supported(qc->dev)) { 3434 tf->protocol = ATA_PROT_NCQ; 3435 tf->command = ATA_CMD_FPDMA_RECV; 3436 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f; 3437 tf->nsect = qc->hw_tag << 3; 3438 tf->feature = sect & 0xff; 3439 tf->hob_feature = (sect >> 8) & 0xff; 3440 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8); 3441 } else { 3442 tf->command = ATA_CMD_ZAC_MGMT_IN; 3443 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES; 3444 tf->protocol = ATA_PROT_DMA; 3445 tf->hob_feature = options; 3446 tf->hob_nsect = (sect >> 8) & 0xff; 3447 tf->nsect = sect & 0xff; 3448 } 3449 tf->device = ATA_LBA; 3450 tf->lbah = (block >> 16) & 0xff; 3451 tf->lbam = (block >> 8) & 0xff; 3452 tf->lbal = block & 0xff; 3453 tf->hob_lbah = (block >> 40) & 0xff; 3454 tf->hob_lbam = (block >> 32) & 0xff; 3455 tf->hob_lbal = (block >> 24) & 0xff; 3456 3457 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3458 qc->flags |= ATA_QCFLAG_RESULT_TF; 3459 3460 ata_qc_set_pc_nbytes(qc); 3461 3462 qc->complete_fn = ata_scsi_report_zones_complete; 3463 3464 return 0; 3465 3466 invalid_fld: 3467 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3468 return 1; 3469 3470 invalid_param_len: 3471 /* "Parameter list length error" */ 3472 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3473 return 1; 3474 } 3475 3476 static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc) 3477 { 3478 struct ata_taskfile *tf = &qc->tf; 3479 struct scsi_cmnd *scmd = qc->scsicmd; 3480 struct ata_device *dev = qc->dev; 3481 const u8 *cdb = scmd->cmnd; 3482 u8 all, sa; 3483 u64 block; 3484 u32 n_block; 3485 u16 fp = (u16)-1; 3486 3487 if (unlikely(scmd->cmd_len < 16)) { 3488 fp = 15; 3489 goto invalid_fld; 3490 } 3491 3492 sa = cdb[1] & 0x1f; 3493 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) && 3494 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) { 3495 fp = 1; 3496 goto invalid_fld; 3497 } 3498 3499 scsi_16_lba_len(cdb, &block, &n_block); 3500 if (n_block) { 3501 /* 3502 * ZAC MANAGEMENT OUT doesn't define any length 3503 */ 3504 goto invalid_param_len; 3505 } 3506 3507 all = cdb[14] & 0x1; 3508 if (all) { 3509 /* 3510 * Ignore the block address (zone ID) as defined by ZBC. 3511 */ 3512 block = 0; 3513 } else if (block >= dev->n_sectors) { 3514 /* 3515 * Block must be a valid zone ID (a zone start LBA). 3516 */ 3517 fp = 2; 3518 goto invalid_fld; 3519 } 3520 3521 if (ata_ncq_enabled(qc->dev) && 3522 ata_fpdma_zac_mgmt_out_supported(qc->dev)) { 3523 tf->protocol = ATA_PROT_NCQ_NODATA; 3524 tf->command = ATA_CMD_NCQ_NON_DATA; 3525 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT; 3526 tf->nsect = qc->hw_tag << 3; 3527 tf->auxiliary = sa | ((u16)all << 8); 3528 } else { 3529 tf->protocol = ATA_PROT_NODATA; 3530 tf->command = ATA_CMD_ZAC_MGMT_OUT; 3531 tf->feature = sa; 3532 tf->hob_feature = all; 3533 } 3534 tf->lbah = (block >> 16) & 0xff; 3535 tf->lbam = (block >> 8) & 0xff; 3536 tf->lbal = block & 0xff; 3537 tf->hob_lbah = (block >> 40) & 0xff; 3538 tf->hob_lbam = (block >> 32) & 0xff; 3539 tf->hob_lbal = (block >> 24) & 0xff; 3540 tf->device = ATA_LBA; 3541 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3542 3543 return 0; 3544 3545 invalid_fld: 3546 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 3547 return 1; 3548 invalid_param_len: 3549 /* "Parameter list length error" */ 3550 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3551 return 1; 3552 } 3553 3554 /** 3555 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3556 * @qc: Storage for translated ATA taskfile 3557 * @buf: input buffer 3558 * @len: number of valid bytes in the input buffer 3559 * @fp: out parameter for the failed field on error 3560 * 3561 * Prepare a taskfile to modify caching information for the device. 3562 * 3563 * LOCKING: 3564 * None. 3565 */ 3566 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3567 const u8 *buf, int len, u16 *fp) 3568 { 3569 struct ata_taskfile *tf = &qc->tf; 3570 struct ata_device *dev = qc->dev; 3571 u8 mpage[CACHE_MPAGE_LEN]; 3572 u8 wce; 3573 int i; 3574 3575 /* 3576 * The first two bytes of def_cache_mpage are a header, so offsets 3577 * in mpage are off by 2 compared to buf. Same for len. 3578 */ 3579 3580 if (len != CACHE_MPAGE_LEN - 2) { 3581 *fp = min(len, CACHE_MPAGE_LEN - 2); 3582 return -EINVAL; 3583 } 3584 3585 wce = buf[0] & (1 << 2); 3586 3587 /* 3588 * Check that read-only bits are not modified. 3589 */ 3590 ata_msense_caching(dev->id, mpage, false); 3591 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) { 3592 if (i == 0) 3593 continue; 3594 if (mpage[i + 2] != buf[i]) { 3595 *fp = i; 3596 return -EINVAL; 3597 } 3598 } 3599 3600 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3601 tf->protocol = ATA_PROT_NODATA; 3602 tf->nsect = 0; 3603 tf->command = ATA_CMD_SET_FEATURES; 3604 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3605 return 0; 3606 } 3607 3608 /** 3609 * ata_mselect_control - Simulate MODE SELECT for control page 3610 * @qc: Storage for translated ATA taskfile 3611 * @buf: input buffer 3612 * @len: number of valid bytes in the input buffer 3613 * @fp: out parameter for the failed field on error 3614 * 3615 * Prepare a taskfile to modify caching information for the device. 3616 * 3617 * LOCKING: 3618 * None. 3619 */ 3620 static int ata_mselect_control(struct ata_queued_cmd *qc, 3621 const u8 *buf, int len, u16 *fp) 3622 { 3623 struct ata_device *dev = qc->dev; 3624 u8 mpage[CONTROL_MPAGE_LEN]; 3625 u8 d_sense; 3626 int i; 3627 3628 /* 3629 * The first two bytes of def_control_mpage are a header, so offsets 3630 * in mpage are off by 2 compared to buf. Same for len. 3631 */ 3632 3633 if (len != CONTROL_MPAGE_LEN - 2) { 3634 *fp = min(len, CONTROL_MPAGE_LEN - 2); 3635 return -EINVAL; 3636 } 3637 3638 d_sense = buf[0] & (1 << 2); 3639 3640 /* 3641 * Check that read-only bits are not modified. 3642 */ 3643 ata_msense_control(dev, mpage, false); 3644 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) { 3645 if (i == 0) 3646 continue; 3647 if (mpage[2 + i] != buf[i]) { 3648 *fp = i; 3649 return -EINVAL; 3650 } 3651 } 3652 if (d_sense & (1 << 2)) 3653 dev->flags |= ATA_DFLAG_D_SENSE; 3654 else 3655 dev->flags &= ~ATA_DFLAG_D_SENSE; 3656 return 0; 3657 } 3658 3659 /** 3660 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands 3661 * @qc: Storage for translated ATA taskfile 3662 * 3663 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3664 * Assume this is invoked for direct access devices (e.g. disks) only. 3665 * There should be no block descriptor for other device types. 3666 * 3667 * LOCKING: 3668 * spin_lock_irqsave(host lock) 3669 */ 3670 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3671 { 3672 struct scsi_cmnd *scmd = qc->scsicmd; 3673 const u8 *cdb = scmd->cmnd; 3674 u8 pg, spg; 3675 unsigned six_byte, pg_len, hdr_len, bd_len; 3676 int len; 3677 u16 fp = (u16)-1; 3678 u8 bp = 0xff; 3679 u8 buffer[64]; 3680 const u8 *p = buffer; 3681 3682 six_byte = (cdb[0] == MODE_SELECT); 3683 if (six_byte) { 3684 if (scmd->cmd_len < 5) { 3685 fp = 4; 3686 goto invalid_fld; 3687 } 3688 3689 len = cdb[4]; 3690 hdr_len = 4; 3691 } else { 3692 if (scmd->cmd_len < 9) { 3693 fp = 8; 3694 goto invalid_fld; 3695 } 3696 3697 len = get_unaligned_be16(&cdb[7]); 3698 hdr_len = 8; 3699 } 3700 3701 /* We only support PF=1, SP=0. */ 3702 if ((cdb[1] & 0x11) != 0x10) { 3703 fp = 1; 3704 bp = (cdb[1] & 0x01) ? 1 : 5; 3705 goto invalid_fld; 3706 } 3707 3708 /* Test early for possible overrun. */ 3709 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3710 goto invalid_param_len; 3711 3712 /* Move past header and block descriptors. */ 3713 if (len < hdr_len) 3714 goto invalid_param_len; 3715 3716 if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd), 3717 buffer, sizeof(buffer))) 3718 goto invalid_param_len; 3719 3720 if (six_byte) 3721 bd_len = p[3]; 3722 else 3723 bd_len = get_unaligned_be16(&p[6]); 3724 3725 len -= hdr_len; 3726 p += hdr_len; 3727 if (len < bd_len) 3728 goto invalid_param_len; 3729 if (bd_len != 0 && bd_len != 8) { 3730 fp = (six_byte) ? 3 : 6; 3731 fp += bd_len + hdr_len; 3732 goto invalid_param; 3733 } 3734 3735 len -= bd_len; 3736 p += bd_len; 3737 if (len == 0) 3738 goto skip; 3739 3740 /* Parse both possible formats for the mode page headers. */ 3741 pg = p[0] & 0x3f; 3742 if (p[0] & 0x40) { 3743 if (len < 4) 3744 goto invalid_param_len; 3745 3746 spg = p[1]; 3747 pg_len = get_unaligned_be16(&p[2]); 3748 p += 4; 3749 len -= 4; 3750 } else { 3751 if (len < 2) 3752 goto invalid_param_len; 3753 3754 spg = 0; 3755 pg_len = p[1]; 3756 p += 2; 3757 len -= 2; 3758 } 3759 3760 /* 3761 * No mode subpages supported (yet) but asking for _all_ 3762 * subpages may be valid 3763 */ 3764 if (spg && (spg != ALL_SUB_MPAGES)) { 3765 fp = (p[0] & 0x40) ? 1 : 0; 3766 fp += hdr_len + bd_len; 3767 goto invalid_param; 3768 } 3769 if (pg_len > len) 3770 goto invalid_param_len; 3771 3772 switch (pg) { 3773 case CACHE_MPAGE: 3774 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) { 3775 fp += hdr_len + bd_len; 3776 goto invalid_param; 3777 } 3778 break; 3779 case CONTROL_MPAGE: 3780 if (ata_mselect_control(qc, p, pg_len, &fp) < 0) { 3781 fp += hdr_len + bd_len; 3782 goto invalid_param; 3783 } else { 3784 goto skip; /* No ATA command to send */ 3785 } 3786 break; 3787 default: /* invalid page code */ 3788 fp = bd_len + hdr_len; 3789 goto invalid_param; 3790 } 3791 3792 /* 3793 * Only one page has changeable data, so we only support setting one 3794 * page at a time. 3795 */ 3796 if (len > pg_len) 3797 goto invalid_param; 3798 3799 return 0; 3800 3801 invalid_fld: 3802 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3803 return 1; 3804 3805 invalid_param: 3806 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp); 3807 return 1; 3808 3809 invalid_param_len: 3810 /* "Parameter list length error" */ 3811 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3812 return 1; 3813 3814 skip: 3815 scmd->result = SAM_STAT_GOOD; 3816 return 1; 3817 } 3818 3819 static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma) 3820 { 3821 if (len == 0) 3822 return ATA_CMD_TRUSTED_NONDATA; 3823 else if (send) 3824 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND; 3825 else 3826 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV; 3827 } 3828 3829 static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc) 3830 { 3831 struct scsi_cmnd *scmd = qc->scsicmd; 3832 const u8 *cdb = scmd->cmnd; 3833 struct ata_taskfile *tf = &qc->tf; 3834 u8 secp = cdb[1]; 3835 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT); 3836 u16 spsp = get_unaligned_be16(&cdb[2]); 3837 u32 len = get_unaligned_be32(&cdb[6]); 3838 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO); 3839 3840 /* 3841 * We don't support the ATA "security" protocol. 3842 */ 3843 if (secp == 0xef) { 3844 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0); 3845 return 1; 3846 } 3847 3848 if (cdb[4] & 7) { /* INC_512 */ 3849 if (len > 0xffff) { 3850 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3851 return 1; 3852 } 3853 } else { 3854 if (len > 0x01fffe00) { 3855 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3856 return 1; 3857 } 3858 3859 /* convert to the sector-based ATA addressing */ 3860 len = (len + 511) / 512; 3861 } 3862 3863 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO; 3864 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA; 3865 if (send) 3866 tf->flags |= ATA_TFLAG_WRITE; 3867 tf->command = ata_scsi_trusted_op(len, send, dma); 3868 tf->feature = secp; 3869 tf->lbam = spsp & 0xff; 3870 tf->lbah = spsp >> 8; 3871 3872 if (len) { 3873 tf->nsect = len & 0xff; 3874 tf->lbal = len >> 8; 3875 } else { 3876 if (!send) 3877 tf->lbah = (1 << 7); 3878 } 3879 3880 ata_qc_set_pc_nbytes(qc); 3881 return 0; 3882 } 3883 3884 /** 3885 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler 3886 * @qc: Command to be translated 3887 * 3888 * Translate a SCSI variable length CDB to specified commands. 3889 * It checks a service action value in CDB to call corresponding handler. 3890 * 3891 * RETURNS: 3892 * Zero on success, non-zero on failure 3893 * 3894 */ 3895 static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc) 3896 { 3897 struct scsi_cmnd *scmd = qc->scsicmd; 3898 const u8 *cdb = scmd->cmnd; 3899 const u16 sa = get_unaligned_be16(&cdb[8]); 3900 3901 /* 3902 * if service action represents a ata pass-thru(32) command, 3903 * then pass it to ata_scsi_pass_thru handler. 3904 */ 3905 if (sa == ATA_32) 3906 return ata_scsi_pass_thru(qc); 3907 3908 /* unsupported service action */ 3909 return 1; 3910 } 3911 3912 /** 3913 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3914 * @dev: ATA device 3915 * @cmd: SCSI command opcode to consider 3916 * 3917 * Look up the SCSI command given, and determine whether the 3918 * SCSI command is to be translated or simulated. 3919 * 3920 * RETURNS: 3921 * Pointer to translation function if possible, %NULL if not. 3922 */ 3923 3924 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3925 { 3926 switch (cmd) { 3927 case READ_6: 3928 case READ_10: 3929 case READ_16: 3930 3931 case WRITE_6: 3932 case WRITE_10: 3933 case WRITE_16: 3934 return ata_scsi_rw_xlat; 3935 3936 case WRITE_SAME_16: 3937 return ata_scsi_write_same_xlat; 3938 3939 case SYNCHRONIZE_CACHE: 3940 case SYNCHRONIZE_CACHE_16: 3941 if (ata_try_flush_cache(dev)) 3942 return ata_scsi_flush_xlat; 3943 break; 3944 3945 case VERIFY: 3946 case VERIFY_16: 3947 return ata_scsi_verify_xlat; 3948 3949 case ATA_12: 3950 case ATA_16: 3951 return ata_scsi_pass_thru; 3952 3953 case VARIABLE_LENGTH_CMD: 3954 return ata_scsi_var_len_cdb_xlat; 3955 3956 case MODE_SELECT: 3957 case MODE_SELECT_10: 3958 return ata_scsi_mode_select_xlat; 3959 3960 case ZBC_IN: 3961 return ata_scsi_zbc_in_xlat; 3962 3963 case ZBC_OUT: 3964 return ata_scsi_zbc_out_xlat; 3965 3966 case SECURITY_PROTOCOL_IN: 3967 case SECURITY_PROTOCOL_OUT: 3968 if (!(dev->flags & ATA_DFLAG_TRUSTED)) 3969 break; 3970 return ata_scsi_security_inout_xlat; 3971 3972 case START_STOP: 3973 return ata_scsi_start_stop_xlat; 3974 } 3975 3976 return NULL; 3977 } 3978 3979 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev) 3980 { 3981 struct ata_port *ap = dev->link->ap; 3982 u8 scsi_op = scmd->cmnd[0]; 3983 ata_xlat_func_t xlat_func; 3984 3985 /* 3986 * scsi_queue_rq() will defer commands if scsi_host_in_recovery(). 3987 * However, this check is done without holding the ap->lock (a libata 3988 * specific lock), so we can have received an error irq since then, 3989 * therefore we must check if EH is pending, while holding ap->lock. 3990 */ 3991 if (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) 3992 return SCSI_MLQUEUE_DEVICE_BUSY; 3993 3994 if (unlikely(!scmd->cmd_len)) 3995 goto bad_cdb_len; 3996 3997 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 3998 if (unlikely(scmd->cmd_len > dev->cdb_len)) 3999 goto bad_cdb_len; 4000 4001 xlat_func = ata_get_xlat_func(dev, scsi_op); 4002 } else if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 4003 /* relay SCSI command to ATAPI device */ 4004 int len = COMMAND_SIZE(scsi_op); 4005 4006 if (unlikely(len > scmd->cmd_len || 4007 len > dev->cdb_len || 4008 scmd->cmd_len > ATAPI_CDB_LEN)) 4009 goto bad_cdb_len; 4010 4011 xlat_func = atapi_xlat; 4012 } else { 4013 /* ATA_16 passthru, treat as an ATA command */ 4014 if (unlikely(scmd->cmd_len > 16)) 4015 goto bad_cdb_len; 4016 4017 xlat_func = ata_get_xlat_func(dev, scsi_op); 4018 } 4019 4020 if (xlat_func) 4021 return ata_scsi_translate(dev, scmd, xlat_func); 4022 4023 ata_scsi_simulate(dev, scmd); 4024 4025 return 0; 4026 4027 bad_cdb_len: 4028 scmd->result = DID_ERROR << 16; 4029 scsi_done(scmd); 4030 return 0; 4031 } 4032 4033 /** 4034 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 4035 * @shost: SCSI host of command to be sent 4036 * @cmd: SCSI command to be sent 4037 * 4038 * In some cases, this function translates SCSI commands into 4039 * ATA taskfiles, and queues the taskfiles to be sent to 4040 * hardware. In other cases, this function simulates a 4041 * SCSI device by evaluating and responding to certain 4042 * SCSI commands. This creates the overall effect of 4043 * ATA and ATAPI devices appearing as SCSI devices. 4044 * 4045 * LOCKING: 4046 * ATA host lock 4047 * 4048 * RETURNS: 4049 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4050 * 0 otherwise. 4051 */ 4052 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 4053 { 4054 struct ata_port *ap; 4055 struct ata_device *dev; 4056 struct scsi_device *scsidev = cmd->device; 4057 int rc = 0; 4058 unsigned long irq_flags; 4059 4060 ap = ata_shost_to_port(shost); 4061 4062 spin_lock_irqsave(ap->lock, irq_flags); 4063 4064 dev = ata_scsi_find_dev(ap, scsidev); 4065 if (likely(dev)) 4066 rc = __ata_scsi_queuecmd(cmd, dev); 4067 else { 4068 cmd->result = (DID_BAD_TARGET << 16); 4069 scsi_done(cmd); 4070 } 4071 4072 spin_unlock_irqrestore(ap->lock, irq_flags); 4073 4074 return rc; 4075 } 4076 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd); 4077 4078 /** 4079 * ata_scsi_simulate - simulate SCSI command on ATA device 4080 * @dev: the target device 4081 * @cmd: SCSI command being sent to device. 4082 * 4083 * Interprets and directly executes a select list of SCSI commands 4084 * that can be handled internally. 4085 * 4086 * LOCKING: 4087 * spin_lock_irqsave(host lock) 4088 */ 4089 4090 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 4091 { 4092 struct ata_scsi_args args; 4093 const u8 *scsicmd = cmd->cmnd; 4094 u8 tmp8; 4095 4096 args.dev = dev; 4097 args.id = dev->id; 4098 args.cmd = cmd; 4099 4100 switch(scsicmd[0]) { 4101 case INQUIRY: 4102 if (scsicmd[1] & 2) /* is CmdDt set? */ 4103 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4104 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 4105 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 4106 else switch (scsicmd[2]) { 4107 case 0x00: 4108 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 4109 break; 4110 case 0x80: 4111 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 4112 break; 4113 case 0x83: 4114 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 4115 break; 4116 case 0x89: 4117 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 4118 break; 4119 case 0xb0: 4120 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 4121 break; 4122 case 0xb1: 4123 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 4124 break; 4125 case 0xb2: 4126 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 4127 break; 4128 case 0xb6: 4129 if (dev->flags & ATA_DFLAG_ZAC) 4130 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6); 4131 else 4132 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4133 break; 4134 case 0xb9: 4135 if (dev->cpr_log) 4136 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b9); 4137 else 4138 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4139 break; 4140 default: 4141 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4142 break; 4143 } 4144 break; 4145 4146 case MODE_SENSE: 4147 case MODE_SENSE_10: 4148 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 4149 break; 4150 4151 case READ_CAPACITY: 4152 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4153 break; 4154 4155 case SERVICE_ACTION_IN_16: 4156 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 4157 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4158 else 4159 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4160 break; 4161 4162 case REPORT_LUNS: 4163 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 4164 break; 4165 4166 case REQUEST_SENSE: 4167 ata_scsi_set_sense(dev, cmd, 0, 0, 0); 4168 break; 4169 4170 /* if we reach this, then writeback caching is disabled, 4171 * turning this into a no-op. 4172 */ 4173 case SYNCHRONIZE_CACHE: 4174 case SYNCHRONIZE_CACHE_16: 4175 fallthrough; 4176 4177 /* no-op's, complete with success */ 4178 case REZERO_UNIT: 4179 case SEEK_6: 4180 case SEEK_10: 4181 case TEST_UNIT_READY: 4182 break; 4183 4184 case SEND_DIAGNOSTIC: 4185 tmp8 = scsicmd[1] & ~(1 << 3); 4186 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4]) 4187 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4188 break; 4189 4190 case MAINTENANCE_IN: 4191 if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES) 4192 ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in); 4193 else 4194 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4195 break; 4196 4197 /* all other commands */ 4198 default: 4199 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0); 4200 /* "Invalid command operation code" */ 4201 break; 4202 } 4203 4204 scsi_done(cmd); 4205 } 4206 4207 int ata_scsi_add_hosts(struct ata_host *host, const struct scsi_host_template *sht) 4208 { 4209 int i, rc; 4210 4211 for (i = 0; i < host->n_ports; i++) { 4212 struct ata_port *ap = host->ports[i]; 4213 struct Scsi_Host *shost; 4214 4215 rc = -ENOMEM; 4216 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 4217 if (!shost) 4218 goto err_alloc; 4219 4220 shost->eh_noresume = 1; 4221 *(struct ata_port **)&shost->hostdata[0] = ap; 4222 ap->scsi_host = shost; 4223 4224 shost->transportt = ata_scsi_transport_template; 4225 shost->unique_id = ap->print_id; 4226 shost->max_id = 16; 4227 shost->max_lun = 1; 4228 shost->max_channel = 1; 4229 shost->max_cmd_len = 32; 4230 4231 /* Schedule policy is determined by ->qc_defer() 4232 * callback and it needs to see every deferred qc. 4233 * Set host_blocked to 1 to prevent SCSI midlayer from 4234 * automatically deferring requests. 4235 */ 4236 shost->max_host_blocked = 1; 4237 4238 rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev); 4239 if (rc) 4240 goto err_alloc; 4241 } 4242 4243 return 0; 4244 4245 err_alloc: 4246 while (--i >= 0) { 4247 struct Scsi_Host *shost = host->ports[i]->scsi_host; 4248 4249 /* scsi_host_put() is in ata_devres_release() */ 4250 scsi_remove_host(shost); 4251 } 4252 return rc; 4253 } 4254 4255 #ifdef CONFIG_OF 4256 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4257 { 4258 struct scsi_device *sdev = dev->sdev; 4259 struct device *d = ap->host->dev; 4260 struct device_node *np = d->of_node; 4261 struct device_node *child; 4262 4263 for_each_available_child_of_node(np, child) { 4264 int ret; 4265 u32 val; 4266 4267 ret = of_property_read_u32(child, "reg", &val); 4268 if (ret) 4269 continue; 4270 if (val == dev->devno) { 4271 dev_dbg(d, "found matching device node\n"); 4272 sdev->sdev_gendev.of_node = child; 4273 return; 4274 } 4275 } 4276 } 4277 #else 4278 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4279 { 4280 } 4281 #endif 4282 4283 void ata_scsi_scan_host(struct ata_port *ap, int sync) 4284 { 4285 int tries = 5; 4286 struct ata_device *last_failed_dev = NULL; 4287 struct ata_link *link; 4288 struct ata_device *dev; 4289 4290 repeat: 4291 ata_for_each_link(link, ap, EDGE) { 4292 ata_for_each_dev(dev, link, ENABLED) { 4293 struct scsi_device *sdev; 4294 int channel = 0, id = 0; 4295 4296 if (dev->sdev) 4297 continue; 4298 4299 if (ata_is_host_link(link)) 4300 id = dev->devno; 4301 else 4302 channel = link->pmp; 4303 4304 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 4305 NULL); 4306 if (!IS_ERR(sdev)) { 4307 dev->sdev = sdev; 4308 ata_scsi_assign_ofnode(dev, ap); 4309 scsi_device_put(sdev); 4310 } else { 4311 dev->sdev = NULL; 4312 } 4313 } 4314 } 4315 4316 /* If we scanned while EH was in progress or allocation 4317 * failure occurred, scan would have failed silently. Check 4318 * whether all devices are attached. 4319 */ 4320 ata_for_each_link(link, ap, EDGE) { 4321 ata_for_each_dev(dev, link, ENABLED) { 4322 if (!dev->sdev) 4323 goto exit_loop; 4324 } 4325 } 4326 exit_loop: 4327 if (!link) 4328 return; 4329 4330 /* we're missing some SCSI devices */ 4331 if (sync) { 4332 /* If caller requested synchrnous scan && we've made 4333 * any progress, sleep briefly and repeat. 4334 */ 4335 if (dev != last_failed_dev) { 4336 msleep(100); 4337 last_failed_dev = dev; 4338 goto repeat; 4339 } 4340 4341 /* We might be failing to detect boot device, give it 4342 * a few more chances. 4343 */ 4344 if (--tries) { 4345 msleep(100); 4346 goto repeat; 4347 } 4348 4349 ata_port_err(ap, 4350 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 4351 } 4352 4353 queue_delayed_work(system_long_wq, &ap->hotplug_task, 4354 round_jiffies_relative(HZ)); 4355 } 4356 4357 /** 4358 * ata_scsi_offline_dev - offline attached SCSI device 4359 * @dev: ATA device to offline attached SCSI device for 4360 * 4361 * This function is called from ata_eh_hotplug() and responsible 4362 * for taking the SCSI device attached to @dev offline. This 4363 * function is called with host lock which protects dev->sdev 4364 * against clearing. 4365 * 4366 * LOCKING: 4367 * spin_lock_irqsave(host lock) 4368 * 4369 * RETURNS: 4370 * 1 if attached SCSI device exists, 0 otherwise. 4371 */ 4372 int ata_scsi_offline_dev(struct ata_device *dev) 4373 { 4374 if (dev->sdev) { 4375 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 4376 return 1; 4377 } 4378 return 0; 4379 } 4380 4381 /** 4382 * ata_scsi_remove_dev - remove attached SCSI device 4383 * @dev: ATA device to remove attached SCSI device for 4384 * 4385 * This function is called from ata_eh_scsi_hotplug() and 4386 * responsible for removing the SCSI device attached to @dev. 4387 * 4388 * LOCKING: 4389 * Kernel thread context (may sleep). 4390 */ 4391 static void ata_scsi_remove_dev(struct ata_device *dev) 4392 { 4393 struct ata_port *ap = dev->link->ap; 4394 struct scsi_device *sdev; 4395 unsigned long flags; 4396 4397 /* Alas, we need to grab scan_mutex to ensure SCSI device 4398 * state doesn't change underneath us and thus 4399 * scsi_device_get() always succeeds. The mutex locking can 4400 * be removed if there is __scsi_device_get() interface which 4401 * increments reference counts regardless of device state. 4402 */ 4403 mutex_lock(&ap->scsi_host->scan_mutex); 4404 spin_lock_irqsave(ap->lock, flags); 4405 4406 /* clearing dev->sdev is protected by host lock */ 4407 sdev = dev->sdev; 4408 dev->sdev = NULL; 4409 4410 if (sdev) { 4411 /* If user initiated unplug races with us, sdev can go 4412 * away underneath us after the host lock and 4413 * scan_mutex are released. Hold onto it. 4414 */ 4415 if (scsi_device_get(sdev) == 0) { 4416 /* The following ensures the attached sdev is 4417 * offline on return from ata_scsi_offline_dev() 4418 * regardless it wins or loses the race 4419 * against this function. 4420 */ 4421 scsi_device_set_state(sdev, SDEV_OFFLINE); 4422 } else { 4423 WARN_ON(1); 4424 sdev = NULL; 4425 } 4426 } 4427 4428 spin_unlock_irqrestore(ap->lock, flags); 4429 mutex_unlock(&ap->scsi_host->scan_mutex); 4430 4431 if (sdev) { 4432 ata_dev_info(dev, "detaching (SCSI %s)\n", 4433 dev_name(&sdev->sdev_gendev)); 4434 4435 scsi_remove_device(sdev); 4436 scsi_device_put(sdev); 4437 } 4438 } 4439 4440 static void ata_scsi_handle_link_detach(struct ata_link *link) 4441 { 4442 struct ata_port *ap = link->ap; 4443 struct ata_device *dev; 4444 4445 ata_for_each_dev(dev, link, ALL) { 4446 unsigned long flags; 4447 4448 if (!(dev->flags & ATA_DFLAG_DETACHED)) 4449 continue; 4450 4451 spin_lock_irqsave(ap->lock, flags); 4452 dev->flags &= ~ATA_DFLAG_DETACHED; 4453 spin_unlock_irqrestore(ap->lock, flags); 4454 4455 if (zpodd_dev_enabled(dev)) 4456 zpodd_exit(dev); 4457 4458 ata_scsi_remove_dev(dev); 4459 } 4460 } 4461 4462 /** 4463 * ata_scsi_media_change_notify - send media change event 4464 * @dev: Pointer to the disk device with media change event 4465 * 4466 * Tell the block layer to send a media change notification 4467 * event. 4468 * 4469 * LOCKING: 4470 * spin_lock_irqsave(host lock) 4471 */ 4472 void ata_scsi_media_change_notify(struct ata_device *dev) 4473 { 4474 if (dev->sdev) 4475 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 4476 GFP_ATOMIC); 4477 } 4478 4479 /** 4480 * ata_scsi_hotplug - SCSI part of hotplug 4481 * @work: Pointer to ATA port to perform SCSI hotplug on 4482 * 4483 * Perform SCSI part of hotplug. It's executed from a separate 4484 * workqueue after EH completes. This is necessary because SCSI 4485 * hot plugging requires working EH and hot unplugging is 4486 * synchronized with hot plugging with a mutex. 4487 * 4488 * LOCKING: 4489 * Kernel thread context (may sleep). 4490 */ 4491 void ata_scsi_hotplug(struct work_struct *work) 4492 { 4493 struct ata_port *ap = 4494 container_of(work, struct ata_port, hotplug_task.work); 4495 int i; 4496 4497 if (ap->pflags & ATA_PFLAG_UNLOADING) 4498 return; 4499 4500 mutex_lock(&ap->scsi_scan_mutex); 4501 4502 /* Unplug detached devices. We cannot use link iterator here 4503 * because PMP links have to be scanned even if PMP is 4504 * currently not attached. Iterate manually. 4505 */ 4506 ata_scsi_handle_link_detach(&ap->link); 4507 if (ap->pmp_link) 4508 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 4509 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 4510 4511 /* scan for new ones */ 4512 ata_scsi_scan_host(ap, 0); 4513 4514 mutex_unlock(&ap->scsi_scan_mutex); 4515 } 4516 4517 /** 4518 * ata_scsi_user_scan - indication for user-initiated bus scan 4519 * @shost: SCSI host to scan 4520 * @channel: Channel to scan 4521 * @id: ID to scan 4522 * @lun: LUN to scan 4523 * 4524 * This function is called when user explicitly requests bus 4525 * scan. Set probe pending flag and invoke EH. 4526 * 4527 * LOCKING: 4528 * SCSI layer (we don't care) 4529 * 4530 * RETURNS: 4531 * Zero. 4532 */ 4533 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 4534 unsigned int id, u64 lun) 4535 { 4536 struct ata_port *ap = ata_shost_to_port(shost); 4537 unsigned long flags; 4538 int devno, rc = 0; 4539 4540 if (!ap->ops->error_handler) 4541 return -EOPNOTSUPP; 4542 4543 if (lun != SCAN_WILD_CARD && lun) 4544 return -EINVAL; 4545 4546 if (!sata_pmp_attached(ap)) { 4547 if (channel != SCAN_WILD_CARD && channel) 4548 return -EINVAL; 4549 devno = id; 4550 } else { 4551 if (id != SCAN_WILD_CARD && id) 4552 return -EINVAL; 4553 devno = channel; 4554 } 4555 4556 spin_lock_irqsave(ap->lock, flags); 4557 4558 if (devno == SCAN_WILD_CARD) { 4559 struct ata_link *link; 4560 4561 ata_for_each_link(link, ap, EDGE) { 4562 struct ata_eh_info *ehi = &link->eh_info; 4563 ehi->probe_mask |= ATA_ALL_DEVICES; 4564 ehi->action |= ATA_EH_RESET; 4565 } 4566 } else { 4567 struct ata_device *dev = ata_find_dev(ap, devno); 4568 4569 if (dev) { 4570 struct ata_eh_info *ehi = &dev->link->eh_info; 4571 ehi->probe_mask |= 1 << dev->devno; 4572 ehi->action |= ATA_EH_RESET; 4573 } else 4574 rc = -EINVAL; 4575 } 4576 4577 if (rc == 0) { 4578 ata_port_schedule_eh(ap); 4579 spin_unlock_irqrestore(ap->lock, flags); 4580 ata_port_wait_eh(ap); 4581 } else 4582 spin_unlock_irqrestore(ap->lock, flags); 4583 4584 return rc; 4585 } 4586 4587 /** 4588 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4589 * @work: Pointer to ATA port to perform scsi_rescan_device() 4590 * 4591 * After ATA pass thru (SAT) commands are executed successfully, 4592 * libata need to propagate the changes to SCSI layer. 4593 * 4594 * LOCKING: 4595 * Kernel thread context (may sleep). 4596 */ 4597 void ata_scsi_dev_rescan(struct work_struct *work) 4598 { 4599 struct ata_port *ap = 4600 container_of(work, struct ata_port, scsi_rescan_task.work); 4601 struct ata_link *link; 4602 struct ata_device *dev; 4603 unsigned long flags; 4604 bool delay_rescan = false; 4605 4606 mutex_lock(&ap->scsi_scan_mutex); 4607 spin_lock_irqsave(ap->lock, flags); 4608 4609 ata_for_each_link(link, ap, EDGE) { 4610 ata_for_each_dev(dev, link, ENABLED) { 4611 struct scsi_device *sdev = dev->sdev; 4612 4613 if (!sdev) 4614 continue; 4615 if (scsi_device_get(sdev)) 4616 continue; 4617 4618 /* 4619 * If the rescan work was scheduled because of a resume 4620 * event, the port is already fully resumed, but the 4621 * SCSI device may not yet be fully resumed. In such 4622 * case, executing scsi_rescan_device() may cause a 4623 * deadlock with the PM code on device_lock(). Prevent 4624 * this by giving up and retrying rescan after a short 4625 * delay. 4626 */ 4627 delay_rescan = sdev->sdev_gendev.power.is_suspended; 4628 if (delay_rescan) { 4629 scsi_device_put(sdev); 4630 break; 4631 } 4632 4633 spin_unlock_irqrestore(ap->lock, flags); 4634 scsi_rescan_device(&(sdev->sdev_gendev)); 4635 scsi_device_put(sdev); 4636 spin_lock_irqsave(ap->lock, flags); 4637 } 4638 } 4639 4640 spin_unlock_irqrestore(ap->lock, flags); 4641 mutex_unlock(&ap->scsi_scan_mutex); 4642 4643 if (delay_rescan) 4644 schedule_delayed_work(&ap->scsi_rescan_task, 4645 msecs_to_jiffies(5)); 4646 } 4647