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 2048 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 #define CDL_T2A_SUB_MPAGE 0x07 59 #define CDL_T2B_SUB_MPAGE 0x08 60 #define CDL_T2_SUB_MPAGE_LEN 232 61 #define ATA_FEATURE_SUB_MPAGE 0xf2 62 #define ATA_FEATURE_SUB_MPAGE_LEN 16 63 64 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 65 RW_RECOVERY_MPAGE, 66 RW_RECOVERY_MPAGE_LEN - 2, 67 (1 << 7), /* AWRE */ 68 0, /* read retry count */ 69 0, 0, 0, 0, 70 0, /* write retry count */ 71 0, 0, 0 72 }; 73 74 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 75 CACHE_MPAGE, 76 CACHE_MPAGE_LEN - 2, 77 0, /* contains WCE, needs to be 0 for logic */ 78 0, 0, 0, 0, 0, 0, 0, 0, 0, 79 0, /* contains DRA, needs to be 0 for logic */ 80 0, 0, 0, 0, 0, 0, 0 81 }; 82 83 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 84 CONTROL_MPAGE, 85 CONTROL_MPAGE_LEN - 2, 86 2, /* DSENSE=0, GLTSD=1 */ 87 0, /* [QAM+QERR may be 1, see 05-359r1] */ 88 0, 0, 0, 0, 0xff, 0xff, 89 0, 30 /* extended self test time, see 05-359r1 */ 90 }; 91 92 static ssize_t ata_scsi_park_show(struct device *device, 93 struct device_attribute *attr, char *buf) 94 { 95 struct scsi_device *sdev = to_scsi_device(device); 96 struct ata_port *ap; 97 struct ata_link *link; 98 struct ata_device *dev; 99 unsigned long now; 100 unsigned int msecs; 101 int rc = 0; 102 103 ap = ata_shost_to_port(sdev->host); 104 105 spin_lock_irq(ap->lock); 106 dev = ata_scsi_find_dev(ap, sdev); 107 if (!dev) { 108 rc = -ENODEV; 109 goto unlock; 110 } 111 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 112 rc = -EOPNOTSUPP; 113 goto unlock; 114 } 115 116 link = dev->link; 117 now = jiffies; 118 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 119 link->eh_context.unloaded_mask & (1 << dev->devno) && 120 time_after(dev->unpark_deadline, now)) 121 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 122 else 123 msecs = 0; 124 125 unlock: 126 spin_unlock_irq(ap->lock); 127 128 return rc ? rc : sysfs_emit(buf, "%u\n", msecs); 129 } 130 131 static ssize_t ata_scsi_park_store(struct device *device, 132 struct device_attribute *attr, 133 const char *buf, size_t len) 134 { 135 struct scsi_device *sdev = to_scsi_device(device); 136 struct ata_port *ap; 137 struct ata_device *dev; 138 int input; 139 unsigned long flags; 140 int rc; 141 142 rc = kstrtoint(buf, 10, &input); 143 if (rc) 144 return rc; 145 if (input < -2) 146 return -EINVAL; 147 if (input > ATA_TMOUT_MAX_PARK) { 148 rc = -EOVERFLOW; 149 input = ATA_TMOUT_MAX_PARK; 150 } 151 152 ap = ata_shost_to_port(sdev->host); 153 154 spin_lock_irqsave(ap->lock, flags); 155 dev = ata_scsi_find_dev(ap, sdev); 156 if (unlikely(!dev)) { 157 rc = -ENODEV; 158 goto unlock; 159 } 160 if (dev->class != ATA_DEV_ATA && 161 dev->class != ATA_DEV_ZAC) { 162 rc = -EOPNOTSUPP; 163 goto unlock; 164 } 165 166 if (input >= 0) { 167 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 168 rc = -EOPNOTSUPP; 169 goto unlock; 170 } 171 172 dev->unpark_deadline = ata_deadline(jiffies, input); 173 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 174 ata_port_schedule_eh(ap); 175 complete(&ap->park_req_pending); 176 } else { 177 switch (input) { 178 case -1: 179 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 180 break; 181 case -2: 182 dev->flags |= ATA_DFLAG_NO_UNLOAD; 183 break; 184 } 185 } 186 unlock: 187 spin_unlock_irqrestore(ap->lock, flags); 188 189 return rc ? rc : len; 190 } 191 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 192 ata_scsi_park_show, ata_scsi_park_store); 193 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 194 195 bool ata_scsi_sense_is_valid(u8 sk, u8 asc, u8 ascq) 196 { 197 /* 198 * If sk == NO_SENSE, and asc + ascq == NO ADDITIONAL SENSE INFORMATION, 199 * then there is no sense data to add. 200 */ 201 if (sk == 0 && asc == 0 && ascq == 0) 202 return false; 203 204 /* If sk > COMPLETED, sense data is bogus. */ 205 if (sk > COMPLETED) 206 return false; 207 208 return true; 209 } 210 211 void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd, 212 u8 sk, u8 asc, u8 ascq) 213 { 214 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 215 216 scsi_build_sense(cmd, d_sense, sk, asc, ascq); 217 } 218 219 void ata_scsi_set_sense_information(struct ata_device *dev, 220 struct scsi_cmnd *cmd, 221 const struct ata_taskfile *tf) 222 { 223 u64 information; 224 225 information = ata_tf_read_block(tf, dev); 226 if (information == U64_MAX) 227 return; 228 229 scsi_set_sense_information(cmd->sense_buffer, 230 SCSI_SENSE_BUFFERSIZE, information); 231 } 232 233 static void ata_scsi_set_invalid_field(struct ata_device *dev, 234 struct scsi_cmnd *cmd, u16 field, u8 bit) 235 { 236 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0); 237 /* "Invalid field in CDB" */ 238 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 239 field, bit, 1); 240 } 241 242 static void ata_scsi_set_invalid_parameter(struct ata_device *dev, 243 struct scsi_cmnd *cmd, u16 field) 244 { 245 /* "Invalid field in parameter list" */ 246 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0); 247 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 248 field, 0xff, 0); 249 } 250 251 static struct attribute *ata_common_sdev_attrs[] = { 252 &dev_attr_unload_heads.attr, 253 NULL 254 }; 255 256 static const struct attribute_group ata_common_sdev_attr_group = { 257 .attrs = ata_common_sdev_attrs 258 }; 259 260 const struct attribute_group *ata_common_sdev_groups[] = { 261 &ata_common_sdev_attr_group, 262 NULL 263 }; 264 EXPORT_SYMBOL_GPL(ata_common_sdev_groups); 265 266 /** 267 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 268 * @sdev: SCSI device for which BIOS geometry is to be determined 269 * @bdev: block device associated with @sdev 270 * @capacity: capacity of SCSI device 271 * @geom: location to which geometry will be output 272 * 273 * Generic bios head/sector/cylinder calculator 274 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 275 * mapping. Some situations may arise where the disk is not 276 * bootable if this is not used. 277 * 278 * LOCKING: 279 * Defined by the SCSI layer. We don't really care. 280 * 281 * RETURNS: 282 * Zero. 283 */ 284 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 285 sector_t capacity, int geom[]) 286 { 287 geom[0] = 255; 288 geom[1] = 63; 289 sector_div(capacity, 255*63); 290 geom[2] = capacity; 291 292 return 0; 293 } 294 EXPORT_SYMBOL_GPL(ata_std_bios_param); 295 296 /** 297 * ata_scsi_unlock_native_capacity - unlock native capacity 298 * @sdev: SCSI device to adjust device capacity for 299 * 300 * This function is called if a partition on @sdev extends beyond 301 * the end of the device. It requests EH to unlock HPA. 302 * 303 * LOCKING: 304 * Defined by the SCSI layer. Might sleep. 305 */ 306 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 307 { 308 struct ata_port *ap = ata_shost_to_port(sdev->host); 309 struct ata_device *dev; 310 unsigned long flags; 311 312 spin_lock_irqsave(ap->lock, flags); 313 314 dev = ata_scsi_find_dev(ap, sdev); 315 if (dev && dev->n_sectors < dev->n_native_sectors) { 316 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 317 dev->link->eh_info.action |= ATA_EH_RESET; 318 ata_port_schedule_eh(ap); 319 } 320 321 spin_unlock_irqrestore(ap->lock, flags); 322 ata_port_wait_eh(ap); 323 } 324 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity); 325 326 /** 327 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 328 * @ap: target port 329 * @sdev: SCSI device to get identify data for 330 * @arg: User buffer area for identify data 331 * 332 * LOCKING: 333 * Defined by the SCSI layer. We don't really care. 334 * 335 * RETURNS: 336 * Zero on success, negative errno on error. 337 */ 338 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 339 void __user *arg) 340 { 341 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 342 u16 __user *dst = arg; 343 char buf[40]; 344 345 if (!dev) 346 return -ENOMSG; 347 348 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 349 return -EFAULT; 350 351 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 352 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 353 return -EFAULT; 354 355 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 356 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 357 return -EFAULT; 358 359 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 360 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 361 return -EFAULT; 362 363 return 0; 364 } 365 366 /** 367 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 368 * @scsidev: Device to which we are issuing command 369 * @arg: User provided data for issuing command 370 * 371 * LOCKING: 372 * Defined by the SCSI layer. We don't really care. 373 * 374 * RETURNS: 375 * Zero on success, negative errno on error. 376 */ 377 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 378 { 379 int rc = 0; 380 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 381 u8 scsi_cmd[MAX_COMMAND_SIZE]; 382 u8 args[4], *argbuf = NULL; 383 int argsize = 0; 384 struct scsi_sense_hdr sshdr; 385 const struct scsi_exec_args exec_args = { 386 .sshdr = &sshdr, 387 .sense = sensebuf, 388 .sense_len = sizeof(sensebuf), 389 }; 390 int cmd_result; 391 392 if (arg == NULL) 393 return -EINVAL; 394 395 if (copy_from_user(args, arg, sizeof(args))) 396 return -EFAULT; 397 398 memset(sensebuf, 0, sizeof(sensebuf)); 399 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 400 401 if (args[3]) { 402 argsize = ATA_SECT_SIZE * args[3]; 403 argbuf = kmalloc(argsize, GFP_KERNEL); 404 if (argbuf == NULL) { 405 rc = -ENOMEM; 406 goto error; 407 } 408 409 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 410 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 411 block count in sector count field */ 412 } else { 413 scsi_cmd[1] = (3 << 1); /* Non-data */ 414 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 415 } 416 417 scsi_cmd[0] = ATA_16; 418 419 scsi_cmd[4] = args[2]; 420 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 421 scsi_cmd[6] = args[3]; 422 scsi_cmd[8] = args[1]; 423 scsi_cmd[10] = ATA_SMART_LBAM_PASS; 424 scsi_cmd[12] = ATA_SMART_LBAH_PASS; 425 } else { 426 scsi_cmd[6] = args[1]; 427 } 428 scsi_cmd[14] = args[0]; 429 430 /* Good values for timeout and retries? Values below 431 from scsi_ioctl_send_command() for default case... */ 432 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, argbuf, 433 argsize, 10 * HZ, 5, &exec_args); 434 if (cmd_result < 0) { 435 rc = cmd_result; 436 goto error; 437 } 438 if (scsi_sense_valid(&sshdr)) {/* sense data available */ 439 u8 *desc = sensebuf + 8; 440 441 /* If we set cc then ATA pass-through will cause a 442 * check condition even if no error. Filter that. */ 443 if (scsi_status_is_check_condition(cmd_result)) { 444 if (sshdr.sense_key == RECOVERED_ERROR && 445 sshdr.asc == 0 && sshdr.ascq == 0x1d) 446 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 447 } 448 449 /* Send userspace a few ATA registers (same as drivers/ide) */ 450 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 451 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 452 args[0] = desc[13]; /* status */ 453 args[1] = desc[3]; /* error */ 454 args[2] = desc[5]; /* sector count (0:7) */ 455 if (copy_to_user(arg, args, sizeof(args))) 456 rc = -EFAULT; 457 } 458 } 459 460 461 if (cmd_result) { 462 rc = -EIO; 463 goto error; 464 } 465 466 if ((argbuf) 467 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 468 rc = -EFAULT; 469 error: 470 kfree(argbuf); 471 return rc; 472 } 473 474 /** 475 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 476 * @scsidev: Device to which we are issuing command 477 * @arg: User provided data for issuing command 478 * 479 * LOCKING: 480 * Defined by the SCSI layer. We don't really care. 481 * 482 * RETURNS: 483 * Zero on success, negative errno on error. 484 */ 485 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 486 { 487 int rc = 0; 488 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 489 u8 scsi_cmd[MAX_COMMAND_SIZE]; 490 u8 args[7]; 491 struct scsi_sense_hdr sshdr; 492 int cmd_result; 493 const struct scsi_exec_args exec_args = { 494 .sshdr = &sshdr, 495 .sense = sensebuf, 496 .sense_len = sizeof(sensebuf), 497 }; 498 499 if (arg == NULL) 500 return -EINVAL; 501 502 if (copy_from_user(args, arg, sizeof(args))) 503 return -EFAULT; 504 505 memset(sensebuf, 0, sizeof(sensebuf)); 506 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 507 scsi_cmd[0] = ATA_16; 508 scsi_cmd[1] = (3 << 1); /* Non-data */ 509 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 510 scsi_cmd[4] = args[1]; 511 scsi_cmd[6] = args[2]; 512 scsi_cmd[8] = args[3]; 513 scsi_cmd[10] = args[4]; 514 scsi_cmd[12] = args[5]; 515 scsi_cmd[13] = args[6] & 0x4f; 516 scsi_cmd[14] = args[0]; 517 518 /* Good values for timeout and retries? Values below 519 from scsi_ioctl_send_command() for default case... */ 520 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, NULL, 521 0, 10 * HZ, 5, &exec_args); 522 if (cmd_result < 0) { 523 rc = cmd_result; 524 goto error; 525 } 526 if (scsi_sense_valid(&sshdr)) {/* sense data available */ 527 u8 *desc = sensebuf + 8; 528 529 /* If we set cc then ATA pass-through will cause a 530 * check condition even if no error. Filter that. */ 531 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 532 if (sshdr.sense_key == RECOVERED_ERROR && 533 sshdr.asc == 0 && sshdr.ascq == 0x1d) 534 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 535 } 536 537 /* Send userspace ATA registers */ 538 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 539 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 540 args[0] = desc[13]; /* status */ 541 args[1] = desc[3]; /* error */ 542 args[2] = desc[5]; /* sector count (0:7) */ 543 args[3] = desc[7]; /* lbal */ 544 args[4] = desc[9]; /* lbam */ 545 args[5] = desc[11]; /* lbah */ 546 args[6] = desc[12]; /* select */ 547 if (copy_to_user(arg, args, sizeof(args))) 548 rc = -EFAULT; 549 } 550 } 551 552 if (cmd_result) { 553 rc = -EIO; 554 goto error; 555 } 556 557 error: 558 return rc; 559 } 560 561 static bool ata_ioc32(struct ata_port *ap) 562 { 563 if (ap->flags & ATA_FLAG_PIO_DMA) 564 return true; 565 if (ap->pflags & ATA_PFLAG_PIO32) 566 return true; 567 return false; 568 } 569 570 /* 571 * This handles both native and compat commands, so anything added 572 * here must have a compatible argument, or check in_compat_syscall() 573 */ 574 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 575 unsigned int cmd, void __user *arg) 576 { 577 unsigned long val; 578 int rc = -EINVAL; 579 unsigned long flags; 580 581 switch (cmd) { 582 case HDIO_GET_32BIT: 583 spin_lock_irqsave(ap->lock, flags); 584 val = ata_ioc32(ap); 585 spin_unlock_irqrestore(ap->lock, flags); 586 #ifdef CONFIG_COMPAT 587 if (in_compat_syscall()) 588 return put_user(val, (compat_ulong_t __user *)arg); 589 #endif 590 return put_user(val, (unsigned long __user *)arg); 591 592 case HDIO_SET_32BIT: 593 val = (unsigned long) arg; 594 rc = 0; 595 spin_lock_irqsave(ap->lock, flags); 596 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 597 if (val) 598 ap->pflags |= ATA_PFLAG_PIO32; 599 else 600 ap->pflags &= ~ATA_PFLAG_PIO32; 601 } else { 602 if (val != ata_ioc32(ap)) 603 rc = -EINVAL; 604 } 605 spin_unlock_irqrestore(ap->lock, flags); 606 return rc; 607 608 case HDIO_GET_IDENTITY: 609 return ata_get_identity(ap, scsidev, arg); 610 611 case HDIO_DRIVE_CMD: 612 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 613 return -EACCES; 614 return ata_cmd_ioctl(scsidev, arg); 615 616 case HDIO_DRIVE_TASK: 617 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 618 return -EACCES; 619 return ata_task_ioctl(scsidev, arg); 620 621 default: 622 rc = -ENOTTY; 623 break; 624 } 625 626 return rc; 627 } 628 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 629 630 int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd, 631 void __user *arg) 632 { 633 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 634 scsidev, cmd, arg); 635 } 636 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 637 638 /** 639 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 640 * @dev: ATA device to which the new command is attached 641 * @cmd: SCSI command that originated this ATA command 642 * 643 * Obtain a reference to an unused ata_queued_cmd structure, 644 * which is the basic libata structure representing a single 645 * ATA command sent to the hardware. 646 * 647 * If a command was available, fill in the SCSI-specific 648 * portions of the structure with information on the 649 * current command. 650 * 651 * LOCKING: 652 * spin_lock_irqsave(host lock) 653 * 654 * RETURNS: 655 * Command allocated, or %NULL if none available. 656 */ 657 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 658 struct scsi_cmnd *cmd) 659 { 660 struct ata_port *ap = dev->link->ap; 661 struct ata_queued_cmd *qc; 662 int tag; 663 664 if (unlikely(ata_port_is_frozen(ap))) 665 goto fail; 666 667 if (ap->flags & ATA_FLAG_SAS_HOST) { 668 /* 669 * SAS hosts may queue > ATA_MAX_QUEUE commands so use 670 * unique per-device budget token as a tag. 671 */ 672 if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE)) 673 goto fail; 674 tag = cmd->budget_token; 675 } else { 676 tag = scsi_cmd_to_rq(cmd)->tag; 677 } 678 679 qc = __ata_qc_from_tag(ap, tag); 680 qc->tag = qc->hw_tag = tag; 681 qc->ap = ap; 682 qc->dev = dev; 683 684 ata_qc_reinit(qc); 685 686 qc->scsicmd = cmd; 687 qc->scsidone = scsi_done; 688 689 qc->sg = scsi_sglist(cmd); 690 qc->n_elem = scsi_sg_count(cmd); 691 692 if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET) 693 qc->flags |= ATA_QCFLAG_QUIET; 694 695 return qc; 696 697 fail: 698 set_host_byte(cmd, DID_OK); 699 set_status_byte(cmd, SAM_STAT_TASK_SET_FULL); 700 scsi_done(cmd); 701 return NULL; 702 } 703 704 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 705 { 706 struct scsi_cmnd *scmd = qc->scsicmd; 707 708 qc->extrabytes = scmd->extra_len; 709 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 710 } 711 712 /** 713 * ata_to_sense_error - convert ATA error to SCSI error 714 * @id: ATA device number 715 * @drv_stat: value contained in ATA status register 716 * @drv_err: value contained in ATA error register 717 * @sk: the sense key we'll fill out 718 * @asc: the additional sense code we'll fill out 719 * @ascq: the additional sense code qualifier we'll fill out 720 * 721 * Converts an ATA error into a SCSI error. Fill out pointers to 722 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 723 * format sense blocks. 724 * 725 * LOCKING: 726 * spin_lock_irqsave(host lock) 727 */ 728 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 729 u8 *asc, u8 *ascq) 730 { 731 int i; 732 733 /* Based on the 3ware driver translation table */ 734 static const unsigned char sense_table[][4] = { 735 /* BBD|ECC|ID|MAR */ 736 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 737 // Device busy Aborted command 738 /* BBD|ECC|ID */ 739 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 740 // Device busy Aborted command 741 /* ECC|MC|MARK */ 742 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 743 // Device fault Hardware error 744 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 745 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 746 // Data CRC error SCSI parity error 747 /* MC|ID|ABRT|TRK0|MARK */ 748 {0x37, NOT_READY, 0x04, 0x00}, 749 // Unit offline Not ready 750 /* MCR|MARK */ 751 {0x09, NOT_READY, 0x04, 0x00}, 752 // Unrecovered disk error Not ready 753 /* Bad address mark */ 754 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 755 // Address mark not found for data field 756 /* TRK0 - Track 0 not found */ 757 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 758 // Hardware error 759 /* Abort: 0x04 is not translated here, see below */ 760 /* Media change request */ 761 {0x08, NOT_READY, 0x04, 0x00}, 762 // FIXME: faking offline 763 /* SRV/IDNF - ID not found */ 764 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 765 // Logical address out of range 766 /* MC - Media Changed */ 767 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 768 // Not ready to ready change, medium may have changed 769 /* ECC - Uncorrectable ECC error */ 770 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 771 // Unrecovered read error 772 /* BBD - block marked bad */ 773 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 774 // Block marked bad Medium error, unrecovered read error 775 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 776 }; 777 static const unsigned char stat_table[][4] = { 778 /* Must be first because BUSY means no other bits valid */ 779 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 780 // Busy, fake parity for now 781 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 782 // Device ready, unaligned write command 783 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 784 // Device fault, internal target failure 785 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 786 // Timed out in xfer, fake parity for now 787 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 788 // Recovered ECC error Medium error, recovered 789 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 790 }; 791 792 /* 793 * Is this an error we can process/parse 794 */ 795 if (drv_stat & ATA_BUSY) { 796 drv_err = 0; /* Ignore the err bits, they're invalid */ 797 } 798 799 if (drv_err) { 800 /* Look for drv_err */ 801 for (i = 0; sense_table[i][0] != 0xFF; i++) { 802 /* Look for best matches first */ 803 if ((sense_table[i][0] & drv_err) == 804 sense_table[i][0]) { 805 *sk = sense_table[i][1]; 806 *asc = sense_table[i][2]; 807 *ascq = sense_table[i][3]; 808 return; 809 } 810 } 811 } 812 813 /* 814 * Fall back to interpreting status bits. Note that if the drv_err 815 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 816 * is not descriptive enough. 817 */ 818 for (i = 0; stat_table[i][0] != 0xFF; i++) { 819 if (stat_table[i][0] & drv_stat) { 820 *sk = stat_table[i][1]; 821 *asc = stat_table[i][2]; 822 *ascq = stat_table[i][3]; 823 return; 824 } 825 } 826 827 /* 828 * We need a sensible error return here, which is tricky, and one 829 * that won't cause people to do things like return a disk wrongly. 830 */ 831 *sk = ABORTED_COMMAND; 832 *asc = 0x00; 833 *ascq = 0x00; 834 } 835 836 /* 837 * ata_gen_passthru_sense - Generate check condition sense block. 838 * @qc: Command that completed. 839 * 840 * This function is specific to the ATA descriptor format sense 841 * block specified for the ATA pass through commands. Regardless 842 * of whether the command errored or not, return a sense 843 * block. Copy all controller registers into the sense 844 * block. If there was no error, we get the request from an ATA 845 * passthrough command, so we use the following sense data: 846 * sk = RECOVERED ERROR 847 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 848 * 849 * 850 * LOCKING: 851 * None. 852 */ 853 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 854 { 855 struct scsi_cmnd *cmd = qc->scsicmd; 856 struct ata_taskfile *tf = &qc->result_tf; 857 unsigned char *sb = cmd->sense_buffer; 858 unsigned char *desc = sb + 8; 859 u8 sense_key, asc, ascq; 860 861 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 862 863 /* 864 * Use ata_to_sense_error() to map status register bits 865 * onto sense key, asc & ascq. 866 */ 867 if (qc->err_mask || 868 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 869 ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, 870 &sense_key, &asc, &ascq); 871 ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq); 872 } else { 873 /* 874 * ATA PASS-THROUGH INFORMATION AVAILABLE 875 * Always in descriptor format sense. 876 */ 877 scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D); 878 } 879 880 if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) { 881 u8 len; 882 883 /* descriptor format */ 884 len = sb[7]; 885 desc = (char *)scsi_sense_desc_find(sb, len + 8, 9); 886 if (!desc) { 887 if (SCSI_SENSE_BUFFERSIZE < len + 14) 888 return; 889 sb[7] = len + 14; 890 desc = sb + 8 + len; 891 } 892 desc[0] = 9; 893 desc[1] = 12; 894 /* 895 * Copy registers into sense buffer. 896 */ 897 desc[2] = 0x00; 898 desc[3] = tf->error; 899 desc[5] = tf->nsect; 900 desc[7] = tf->lbal; 901 desc[9] = tf->lbam; 902 desc[11] = tf->lbah; 903 desc[12] = tf->device; 904 desc[13] = tf->status; 905 906 /* 907 * Fill in Extend bit, and the high order bytes 908 * if applicable. 909 */ 910 if (tf->flags & ATA_TFLAG_LBA48) { 911 desc[2] |= 0x01; 912 desc[4] = tf->hob_nsect; 913 desc[6] = tf->hob_lbal; 914 desc[8] = tf->hob_lbam; 915 desc[10] = tf->hob_lbah; 916 } 917 } else { 918 /* Fixed sense format */ 919 desc[0] = tf->error; 920 desc[1] = tf->status; 921 desc[2] = tf->device; 922 desc[3] = tf->nsect; 923 desc[7] = 0; 924 if (tf->flags & ATA_TFLAG_LBA48) { 925 desc[8] |= 0x80; 926 if (tf->hob_nsect) 927 desc[8] |= 0x40; 928 if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah) 929 desc[8] |= 0x20; 930 } 931 desc[9] = tf->lbal; 932 desc[10] = tf->lbam; 933 desc[11] = tf->lbah; 934 } 935 } 936 937 /** 938 * ata_gen_ata_sense - generate a SCSI fixed sense block 939 * @qc: Command that we are erroring out 940 * 941 * Generate sense block for a failed ATA command @qc. Descriptor 942 * format is used to accommodate LBA48 block address. 943 * 944 * LOCKING: 945 * None. 946 */ 947 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 948 { 949 struct ata_device *dev = qc->dev; 950 struct scsi_cmnd *cmd = qc->scsicmd; 951 struct ata_taskfile *tf = &qc->result_tf; 952 unsigned char *sb = cmd->sense_buffer; 953 u64 block; 954 u8 sense_key, asc, ascq; 955 956 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 957 958 if (ata_dev_disabled(dev)) { 959 /* Device disabled after error recovery */ 960 /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */ 961 ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21); 962 return; 963 } 964 /* Use ata_to_sense_error() to map status register bits 965 * onto sense key, asc & ascq. 966 */ 967 if (qc->err_mask || 968 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 969 ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, 970 &sense_key, &asc, &ascq); 971 ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq); 972 } else { 973 /* Could not decode error */ 974 ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n", 975 tf->status, qc->err_mask); 976 ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0); 977 return; 978 } 979 980 block = ata_tf_read_block(&qc->result_tf, dev); 981 if (block == U64_MAX) 982 return; 983 984 scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block); 985 } 986 987 void ata_scsi_sdev_config(struct scsi_device *sdev) 988 { 989 sdev->use_10_for_rw = 1; 990 sdev->use_10_for_ms = 1; 991 sdev->no_write_same = 1; 992 993 /* Schedule policy is determined by ->qc_defer() callback and 994 * it needs to see every deferred qc. Set dev_blocked to 1 to 995 * prevent SCSI midlayer from automatically deferring 996 * requests. 997 */ 998 sdev->max_device_blocked = 1; 999 } 1000 1001 /** 1002 * ata_scsi_dma_need_drain - Check whether data transfer may overflow 1003 * @rq: request to be checked 1004 * 1005 * ATAPI commands which transfer variable length data to host 1006 * might overflow due to application error or hardware bug. This 1007 * function checks whether overflow should be drained and ignored 1008 * for @request. 1009 * 1010 * LOCKING: 1011 * None. 1012 * 1013 * RETURNS: 1014 * 1 if ; otherwise, 0. 1015 */ 1016 bool ata_scsi_dma_need_drain(struct request *rq) 1017 { 1018 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq); 1019 1020 return atapi_cmd_type(scmd->cmnd[0]) == ATAPI_MISC; 1021 } 1022 EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain); 1023 1024 int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) 1025 { 1026 struct request_queue *q = sdev->request_queue; 1027 int depth = 1; 1028 1029 if (!ata_id_has_unload(dev->id)) 1030 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1031 1032 /* configure max sectors */ 1033 dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors); 1034 blk_queue_max_hw_sectors(q, dev->max_sectors); 1035 1036 if (dev->class == ATA_DEV_ATAPI) { 1037 sdev->sector_size = ATA_SECT_SIZE; 1038 1039 /* set DMA padding */ 1040 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1041 1042 /* make room for appending the drain */ 1043 blk_queue_max_segments(q, queue_max_segments(q) - 1); 1044 1045 sdev->dma_drain_len = ATAPI_MAX_DRAIN; 1046 sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO); 1047 if (!sdev->dma_drain_buf) { 1048 ata_dev_err(dev, "drain buffer allocation failed\n"); 1049 return -ENOMEM; 1050 } 1051 } else { 1052 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1053 /* 1054 * Stop the drive on suspend but do not issue START STOP UNIT 1055 * on resume as this is not necessary and may fail: the device 1056 * will be woken up by ata_port_pm_resume() with a port reset 1057 * and device revalidation. 1058 */ 1059 sdev->manage_start_stop = 1; 1060 sdev->no_start_on_resume = 1; 1061 } 1062 1063 /* 1064 * ata_pio_sectors() expects buffer for each sector to not cross 1065 * page boundary. Enforce it by requiring buffers to be sector 1066 * aligned, which works iff sector_size is not larger than 1067 * PAGE_SIZE. ATAPI devices also need the alignment as 1068 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1069 */ 1070 if (sdev->sector_size > PAGE_SIZE) 1071 ata_dev_warn(dev, 1072 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1073 sdev->sector_size); 1074 1075 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1076 1077 if (dev->flags & ATA_DFLAG_AN) 1078 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1079 1080 if (ata_ncq_supported(dev)) 1081 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1082 depth = min(ATA_MAX_QUEUE, depth); 1083 scsi_change_queue_depth(sdev, depth); 1084 1085 if (dev->flags & ATA_DFLAG_TRUSTED) 1086 sdev->security_supported = 1; 1087 1088 dev->sdev = sdev; 1089 return 0; 1090 } 1091 1092 /** 1093 * ata_scsi_slave_config - Set SCSI device attributes 1094 * @sdev: SCSI device to examine 1095 * 1096 * This is called before we actually start reading 1097 * and writing to the device, to configure certain 1098 * SCSI mid-layer behaviors. 1099 * 1100 * LOCKING: 1101 * Defined by SCSI layer. We don't really care. 1102 */ 1103 1104 int ata_scsi_slave_config(struct scsi_device *sdev) 1105 { 1106 struct ata_port *ap = ata_shost_to_port(sdev->host); 1107 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1108 int rc = 0; 1109 1110 ata_scsi_sdev_config(sdev); 1111 1112 if (dev) 1113 rc = ata_scsi_dev_config(sdev, dev); 1114 1115 return rc; 1116 } 1117 EXPORT_SYMBOL_GPL(ata_scsi_slave_config); 1118 1119 /** 1120 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1121 * @sdev: SCSI device to be destroyed 1122 * 1123 * @sdev is about to be destroyed for hot/warm unplugging. If 1124 * this unplugging was initiated by libata as indicated by NULL 1125 * dev->sdev, this function doesn't have to do anything. 1126 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1127 * Clear dev->sdev, schedule the device for ATA detach and invoke 1128 * EH. 1129 * 1130 * LOCKING: 1131 * Defined by SCSI layer. We don't really care. 1132 */ 1133 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1134 { 1135 struct ata_port *ap = ata_shost_to_port(sdev->host); 1136 unsigned long flags; 1137 struct ata_device *dev; 1138 1139 spin_lock_irqsave(ap->lock, flags); 1140 dev = __ata_scsi_find_dev(ap, sdev); 1141 if (dev && dev->sdev) { 1142 /* SCSI device already in CANCEL state, no need to offline it */ 1143 dev->sdev = NULL; 1144 dev->flags |= ATA_DFLAG_DETACH; 1145 ata_port_schedule_eh(ap); 1146 } 1147 spin_unlock_irqrestore(ap->lock, flags); 1148 1149 kfree(sdev->dma_drain_buf); 1150 } 1151 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy); 1152 1153 /** 1154 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1155 * @qc: Storage for translated ATA taskfile 1156 * 1157 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1158 * (to start). Perhaps these commands should be preceded by 1159 * CHECK POWER MODE to see what power mode the device is already in. 1160 * [See SAT revision 5 at www.t10.org] 1161 * 1162 * LOCKING: 1163 * spin_lock_irqsave(host lock) 1164 * 1165 * RETURNS: 1166 * Zero on success, non-zero on error. 1167 */ 1168 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1169 { 1170 struct scsi_cmnd *scmd = qc->scsicmd; 1171 struct ata_taskfile *tf = &qc->tf; 1172 const u8 *cdb = scmd->cmnd; 1173 u16 fp; 1174 u8 bp = 0xff; 1175 1176 if (scmd->cmd_len < 5) { 1177 fp = 4; 1178 goto invalid_fld; 1179 } 1180 1181 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1182 tf->protocol = ATA_PROT_NODATA; 1183 if (cdb[1] & 0x1) { 1184 ; /* ignore IMMED bit, violates sat-r05 */ 1185 } 1186 if (cdb[4] & 0x2) { 1187 fp = 4; 1188 bp = 1; 1189 goto invalid_fld; /* LOEJ bit set not supported */ 1190 } 1191 if (((cdb[4] >> 4) & 0xf) != 0) { 1192 fp = 4; 1193 bp = 3; 1194 goto invalid_fld; /* power conditions not supported */ 1195 } 1196 1197 if (cdb[4] & 0x1) { 1198 tf->nsect = 1; /* 1 sector, lba=0 */ 1199 1200 if (qc->dev->flags & ATA_DFLAG_LBA) { 1201 tf->flags |= ATA_TFLAG_LBA; 1202 1203 tf->lbah = 0x0; 1204 tf->lbam = 0x0; 1205 tf->lbal = 0x0; 1206 tf->device |= ATA_LBA; 1207 } else { 1208 /* CHS */ 1209 tf->lbal = 0x1; /* sect */ 1210 tf->lbam = 0x0; /* cyl low */ 1211 tf->lbah = 0x0; /* cyl high */ 1212 } 1213 1214 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1215 } else { 1216 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1217 * or S5) causing some drives to spin up and down again. 1218 */ 1219 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1220 system_state == SYSTEM_POWER_OFF) 1221 goto skip; 1222 1223 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1224 system_entering_hibernation()) 1225 goto skip; 1226 1227 /* Issue ATA STANDBY IMMEDIATE command */ 1228 tf->command = ATA_CMD_STANDBYNOW1; 1229 } 1230 1231 /* 1232 * Standby and Idle condition timers could be implemented but that 1233 * would require libata to implement the Power condition mode page 1234 * and allow the user to change it. Changing mode pages requires 1235 * MODE SELECT to be implemented. 1236 */ 1237 1238 return 0; 1239 1240 invalid_fld: 1241 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 1242 return 1; 1243 skip: 1244 scmd->result = SAM_STAT_GOOD; 1245 return 1; 1246 } 1247 1248 1249 /** 1250 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1251 * @qc: Storage for translated ATA taskfile 1252 * 1253 * Sets up an ATA taskfile to issue FLUSH CACHE or 1254 * FLUSH CACHE EXT. 1255 * 1256 * LOCKING: 1257 * spin_lock_irqsave(host lock) 1258 * 1259 * RETURNS: 1260 * Zero on success, non-zero on error. 1261 */ 1262 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1263 { 1264 struct ata_taskfile *tf = &qc->tf; 1265 1266 tf->flags |= ATA_TFLAG_DEVICE; 1267 tf->protocol = ATA_PROT_NODATA; 1268 1269 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1270 tf->command = ATA_CMD_FLUSH_EXT; 1271 else 1272 tf->command = ATA_CMD_FLUSH; 1273 1274 /* flush is critical for IO integrity, consider it an IO command */ 1275 qc->flags |= ATA_QCFLAG_IO; 1276 1277 return 0; 1278 } 1279 1280 /** 1281 * scsi_6_lba_len - Get LBA and transfer length 1282 * @cdb: SCSI command to translate 1283 * 1284 * Calculate LBA and transfer length for 6-byte commands. 1285 * 1286 * RETURNS: 1287 * @plba: the LBA 1288 * @plen: the transfer length 1289 */ 1290 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1291 { 1292 u64 lba = 0; 1293 u32 len; 1294 1295 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1296 lba |= ((u64)cdb[2]) << 8; 1297 lba |= ((u64)cdb[3]); 1298 1299 len = cdb[4]; 1300 1301 *plba = lba; 1302 *plen = len; 1303 } 1304 1305 /** 1306 * scsi_10_lba_len - Get LBA and transfer length 1307 * @cdb: SCSI command to translate 1308 * 1309 * Calculate LBA and transfer length for 10-byte commands. 1310 * 1311 * RETURNS: 1312 * @plba: the LBA 1313 * @plen: the transfer length 1314 */ 1315 static inline void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1316 { 1317 *plba = get_unaligned_be32(&cdb[2]); 1318 *plen = get_unaligned_be16(&cdb[7]); 1319 } 1320 1321 /** 1322 * scsi_16_lba_len - Get LBA and transfer length 1323 * @cdb: SCSI command to translate 1324 * 1325 * Calculate LBA and transfer length for 16-byte commands. 1326 * 1327 * RETURNS: 1328 * @plba: the LBA 1329 * @plen: the transfer length 1330 */ 1331 static inline void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1332 { 1333 *plba = get_unaligned_be64(&cdb[2]); 1334 *plen = get_unaligned_be32(&cdb[10]); 1335 } 1336 1337 /** 1338 * scsi_dld - Get duration limit descriptor index 1339 * @cdb: SCSI command to translate 1340 * 1341 * Returns the dld bits indicating the index of a command duration limit 1342 * descriptor. 1343 */ 1344 static inline int scsi_dld(const u8 *cdb) 1345 { 1346 return ((cdb[1] & 0x01) << 2) | ((cdb[14] >> 6) & 0x03); 1347 } 1348 1349 /** 1350 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1351 * @qc: Storage for translated ATA taskfile 1352 * 1353 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1354 * 1355 * LOCKING: 1356 * spin_lock_irqsave(host lock) 1357 * 1358 * RETURNS: 1359 * Zero on success, non-zero on error. 1360 */ 1361 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1362 { 1363 struct scsi_cmnd *scmd = qc->scsicmd; 1364 struct ata_taskfile *tf = &qc->tf; 1365 struct ata_device *dev = qc->dev; 1366 u64 dev_sectors = qc->dev->n_sectors; 1367 const u8 *cdb = scmd->cmnd; 1368 u64 block; 1369 u32 n_block; 1370 u16 fp; 1371 1372 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1373 tf->protocol = ATA_PROT_NODATA; 1374 1375 switch (cdb[0]) { 1376 case VERIFY: 1377 if (scmd->cmd_len < 10) { 1378 fp = 9; 1379 goto invalid_fld; 1380 } 1381 scsi_10_lba_len(cdb, &block, &n_block); 1382 break; 1383 case VERIFY_16: 1384 if (scmd->cmd_len < 16) { 1385 fp = 15; 1386 goto invalid_fld; 1387 } 1388 scsi_16_lba_len(cdb, &block, &n_block); 1389 break; 1390 default: 1391 fp = 0; 1392 goto invalid_fld; 1393 } 1394 1395 if (!n_block) 1396 goto nothing_to_do; 1397 if (block >= dev_sectors) 1398 goto out_of_range; 1399 if ((block + n_block) > dev_sectors) 1400 goto out_of_range; 1401 1402 if (dev->flags & ATA_DFLAG_LBA) { 1403 tf->flags |= ATA_TFLAG_LBA; 1404 1405 if (lba_28_ok(block, n_block)) { 1406 /* use LBA28 */ 1407 tf->command = ATA_CMD_VERIFY; 1408 tf->device |= (block >> 24) & 0xf; 1409 } else if (lba_48_ok(block, n_block)) { 1410 if (!(dev->flags & ATA_DFLAG_LBA48)) 1411 goto out_of_range; 1412 1413 /* use LBA48 */ 1414 tf->flags |= ATA_TFLAG_LBA48; 1415 tf->command = ATA_CMD_VERIFY_EXT; 1416 1417 tf->hob_nsect = (n_block >> 8) & 0xff; 1418 1419 tf->hob_lbah = (block >> 40) & 0xff; 1420 tf->hob_lbam = (block >> 32) & 0xff; 1421 tf->hob_lbal = (block >> 24) & 0xff; 1422 } else 1423 /* request too large even for LBA48 */ 1424 goto out_of_range; 1425 1426 tf->nsect = n_block & 0xff; 1427 1428 tf->lbah = (block >> 16) & 0xff; 1429 tf->lbam = (block >> 8) & 0xff; 1430 tf->lbal = block & 0xff; 1431 1432 tf->device |= ATA_LBA; 1433 } else { 1434 /* CHS */ 1435 u32 sect, head, cyl, track; 1436 1437 if (!lba_28_ok(block, n_block)) 1438 goto out_of_range; 1439 1440 /* Convert LBA to CHS */ 1441 track = (u32)block / dev->sectors; 1442 cyl = track / dev->heads; 1443 head = track % dev->heads; 1444 sect = (u32)block % dev->sectors + 1; 1445 1446 /* Check whether the converted CHS can fit. 1447 Cylinder: 0-65535 1448 Head: 0-15 1449 Sector: 1-255*/ 1450 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1451 goto out_of_range; 1452 1453 tf->command = ATA_CMD_VERIFY; 1454 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1455 tf->lbal = sect; 1456 tf->lbam = cyl; 1457 tf->lbah = cyl >> 8; 1458 tf->device |= head; 1459 } 1460 1461 return 0; 1462 1463 invalid_fld: 1464 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1465 return 1; 1466 1467 out_of_range: 1468 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1469 /* "Logical Block Address out of range" */ 1470 return 1; 1471 1472 nothing_to_do: 1473 scmd->result = SAM_STAT_GOOD; 1474 return 1; 1475 } 1476 1477 static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks) 1478 { 1479 struct request *rq = scsi_cmd_to_rq(scmd); 1480 u32 req_blocks; 1481 1482 if (!blk_rq_is_passthrough(rq)) 1483 return true; 1484 1485 req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size; 1486 if (n_blocks > req_blocks) 1487 return false; 1488 1489 return true; 1490 } 1491 1492 /** 1493 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1494 * @qc: Storage for translated ATA taskfile 1495 * 1496 * Converts any of six SCSI read/write commands into the 1497 * ATA counterpart, including starting sector (LBA), 1498 * sector count, and taking into account the device's LBA48 1499 * support. 1500 * 1501 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1502 * %WRITE_16 are currently supported. 1503 * 1504 * LOCKING: 1505 * spin_lock_irqsave(host lock) 1506 * 1507 * RETURNS: 1508 * Zero on success, non-zero on error. 1509 */ 1510 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1511 { 1512 struct scsi_cmnd *scmd = qc->scsicmd; 1513 const u8 *cdb = scmd->cmnd; 1514 struct request *rq = scsi_cmd_to_rq(scmd); 1515 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq)); 1516 unsigned int tf_flags = 0; 1517 int dld = 0; 1518 u64 block; 1519 u32 n_block; 1520 int rc; 1521 u16 fp = 0; 1522 1523 switch (cdb[0]) { 1524 case WRITE_6: 1525 case WRITE_10: 1526 case WRITE_16: 1527 tf_flags |= ATA_TFLAG_WRITE; 1528 break; 1529 } 1530 1531 /* Calculate the SCSI LBA, transfer length and FUA. */ 1532 switch (cdb[0]) { 1533 case READ_10: 1534 case WRITE_10: 1535 if (unlikely(scmd->cmd_len < 10)) { 1536 fp = 9; 1537 goto invalid_fld; 1538 } 1539 scsi_10_lba_len(cdb, &block, &n_block); 1540 if (cdb[1] & (1 << 3)) 1541 tf_flags |= ATA_TFLAG_FUA; 1542 if (!ata_check_nblocks(scmd, n_block)) 1543 goto invalid_fld; 1544 break; 1545 case READ_6: 1546 case WRITE_6: 1547 if (unlikely(scmd->cmd_len < 6)) { 1548 fp = 5; 1549 goto invalid_fld; 1550 } 1551 scsi_6_lba_len(cdb, &block, &n_block); 1552 1553 /* for 6-byte r/w commands, transfer length 0 1554 * means 256 blocks of data, not 0 block. 1555 */ 1556 if (!n_block) 1557 n_block = 256; 1558 if (!ata_check_nblocks(scmd, n_block)) 1559 goto invalid_fld; 1560 break; 1561 case READ_16: 1562 case WRITE_16: 1563 if (unlikely(scmd->cmd_len < 16)) { 1564 fp = 15; 1565 goto invalid_fld; 1566 } 1567 scsi_16_lba_len(cdb, &block, &n_block); 1568 dld = scsi_dld(cdb); 1569 if (cdb[1] & (1 << 3)) 1570 tf_flags |= ATA_TFLAG_FUA; 1571 if (!ata_check_nblocks(scmd, n_block)) 1572 goto invalid_fld; 1573 break; 1574 default: 1575 fp = 0; 1576 goto invalid_fld; 1577 } 1578 1579 /* Check and compose ATA command */ 1580 if (!n_block) 1581 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1582 * length 0 means transfer 0 block of data. 1583 * However, for ATA R/W commands, sector count 0 means 1584 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1585 * 1586 * WARNING: one or two older ATA drives treat 0 as 0... 1587 */ 1588 goto nothing_to_do; 1589 1590 qc->flags |= ATA_QCFLAG_IO; 1591 qc->nbytes = n_block * scmd->device->sector_size; 1592 1593 rc = ata_build_rw_tf(qc, block, n_block, tf_flags, dld, class); 1594 if (likely(rc == 0)) 1595 return 0; 1596 1597 if (rc == -ERANGE) 1598 goto out_of_range; 1599 /* treat all other errors as -EINVAL, fall through */ 1600 invalid_fld: 1601 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1602 return 1; 1603 1604 out_of_range: 1605 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1606 /* "Logical Block Address out of range" */ 1607 return 1; 1608 1609 nothing_to_do: 1610 scmd->result = SAM_STAT_GOOD; 1611 return 1; 1612 } 1613 1614 static void ata_qc_done(struct ata_queued_cmd *qc) 1615 { 1616 struct scsi_cmnd *cmd = qc->scsicmd; 1617 void (*done)(struct scsi_cmnd *) = qc->scsidone; 1618 1619 ata_qc_free(qc); 1620 done(cmd); 1621 } 1622 1623 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1624 { 1625 struct scsi_cmnd *cmd = qc->scsicmd; 1626 u8 *cdb = cmd->cmnd; 1627 int need_sense = (qc->err_mask != 0) && 1628 !(qc->flags & ATA_QCFLAG_SENSE_VALID); 1629 1630 /* For ATA pass thru (SAT) commands, generate a sense block if 1631 * user mandated it or if there's an error. Note that if we 1632 * generate because the user forced us to [CK_COND =1], a check 1633 * condition is generated and the ATA register values are returned 1634 * whether the command completed successfully or not. If there 1635 * was no error, we use the following sense data: 1636 * sk = RECOVERED ERROR 1637 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1638 */ 1639 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1640 ((cdb[2] & 0x20) || need_sense)) 1641 ata_gen_passthru_sense(qc); 1642 else if (need_sense) 1643 ata_gen_ata_sense(qc); 1644 else 1645 /* Keep the SCSI ML and status byte, clear host byte. */ 1646 cmd->result &= 0x0000ffff; 1647 1648 ata_qc_done(qc); 1649 } 1650 1651 /** 1652 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1653 * @dev: ATA device to which the command is addressed 1654 * @cmd: SCSI command to execute 1655 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1656 * 1657 * Our ->queuecommand() function has decided that the SCSI 1658 * command issued can be directly translated into an ATA 1659 * command, rather than handled internally. 1660 * 1661 * This function sets up an ata_queued_cmd structure for the 1662 * SCSI command, and sends that ata_queued_cmd to the hardware. 1663 * 1664 * The xlat_func argument (actor) returns 0 if ready to execute 1665 * ATA command, else 1 to finish translation. If 1 is returned 1666 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1667 * to be set reflecting an error condition or clean (early) 1668 * termination. 1669 * 1670 * LOCKING: 1671 * spin_lock_irqsave(host lock) 1672 * 1673 * RETURNS: 1674 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1675 * needs to be deferred. 1676 */ 1677 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1678 ata_xlat_func_t xlat_func) 1679 { 1680 struct ata_port *ap = dev->link->ap; 1681 struct ata_queued_cmd *qc; 1682 int rc; 1683 1684 qc = ata_scsi_qc_new(dev, cmd); 1685 if (!qc) 1686 goto err_mem; 1687 1688 /* data is present; dma-map it */ 1689 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1690 cmd->sc_data_direction == DMA_TO_DEVICE) { 1691 if (unlikely(scsi_bufflen(cmd) < 1)) { 1692 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1693 goto err_did; 1694 } 1695 1696 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1697 1698 qc->dma_dir = cmd->sc_data_direction; 1699 } 1700 1701 qc->complete_fn = ata_scsi_qc_complete; 1702 1703 if (xlat_func(qc)) 1704 goto early_finish; 1705 1706 if (ap->ops->qc_defer) { 1707 if ((rc = ap->ops->qc_defer(qc))) 1708 goto defer; 1709 } 1710 1711 /* select device, send command to hardware */ 1712 ata_qc_issue(qc); 1713 1714 return 0; 1715 1716 early_finish: 1717 ata_qc_free(qc); 1718 scsi_done(cmd); 1719 return 0; 1720 1721 err_did: 1722 ata_qc_free(qc); 1723 cmd->result = (DID_ERROR << 16); 1724 scsi_done(cmd); 1725 err_mem: 1726 return 0; 1727 1728 defer: 1729 ata_qc_free(qc); 1730 if (rc == ATA_DEFER_LINK) 1731 return SCSI_MLQUEUE_DEVICE_BUSY; 1732 else 1733 return SCSI_MLQUEUE_HOST_BUSY; 1734 } 1735 1736 struct ata_scsi_args { 1737 struct ata_device *dev; 1738 u16 *id; 1739 struct scsi_cmnd *cmd; 1740 }; 1741 1742 /** 1743 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1744 * @args: device IDENTIFY data / SCSI command of interest. 1745 * @actor: Callback hook for desired SCSI command simulator 1746 * 1747 * Takes care of the hard work of simulating a SCSI command... 1748 * Mapping the response buffer, calling the command's handler, 1749 * and handling the handler's return value. This return value 1750 * indicates whether the handler wishes the SCSI command to be 1751 * completed successfully (0), or not (in which case cmd->result 1752 * and sense buffer are assumed to be set). 1753 * 1754 * LOCKING: 1755 * spin_lock_irqsave(host lock) 1756 */ 1757 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1758 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1759 { 1760 unsigned int rc; 1761 struct scsi_cmnd *cmd = args->cmd; 1762 unsigned long flags; 1763 1764 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 1765 1766 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1767 rc = actor(args, ata_scsi_rbuf); 1768 if (rc == 0) 1769 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1770 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1771 1772 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 1773 1774 if (rc == 0) 1775 cmd->result = SAM_STAT_GOOD; 1776 } 1777 1778 /** 1779 * ata_scsiop_inq_std - Simulate INQUIRY command 1780 * @args: device IDENTIFY data / SCSI command of interest. 1781 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1782 * 1783 * Returns standard device identification data associated 1784 * with non-VPD INQUIRY command output. 1785 * 1786 * LOCKING: 1787 * spin_lock_irqsave(host lock) 1788 */ 1789 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1790 { 1791 static const u8 versions[] = { 1792 0x00, 1793 0x60, /* SAM-3 (no version claimed) */ 1794 1795 0x03, 1796 0x20, /* SBC-2 (no version claimed) */ 1797 1798 0x03, 1799 0x00 /* SPC-3 (no version claimed) */ 1800 }; 1801 static const u8 versions_zbc[] = { 1802 0x00, 1803 0xA0, /* SAM-5 (no version claimed) */ 1804 1805 0x06, 1806 0x00, /* SBC-4 (no version claimed) */ 1807 1808 0x05, 1809 0xC0, /* SPC-5 (no version claimed) */ 1810 1811 0x60, 1812 0x24, /* ZBC r05 */ 1813 }; 1814 1815 u8 hdr[] = { 1816 TYPE_DISK, 1817 0, 1818 0x5, /* claim SPC-3 version compatibility */ 1819 2, 1820 95 - 4, 1821 0, 1822 0, 1823 2 1824 }; 1825 1826 /* set scsi removable (RMB) bit per ata bit, or if the 1827 * AHCI port says it's external (Hotplug-capable, eSATA). 1828 */ 1829 if (ata_id_removable(args->id) || 1830 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) 1831 hdr[1] |= (1 << 7); 1832 1833 if (args->dev->class == ATA_DEV_ZAC) { 1834 hdr[0] = TYPE_ZBC; 1835 hdr[2] = 0x7; /* claim SPC-5 version compatibility */ 1836 } 1837 1838 memcpy(rbuf, hdr, sizeof(hdr)); 1839 memcpy(&rbuf[8], "ATA ", 8); 1840 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1841 1842 /* From SAT, use last 2 words from fw rev unless they are spaces */ 1843 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 1844 if (strncmp(&rbuf[32], " ", 4) == 0) 1845 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1846 1847 if (rbuf[32] == 0 || rbuf[32] == ' ') 1848 memcpy(&rbuf[32], "n/a ", 4); 1849 1850 if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC) 1851 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 1852 else 1853 memcpy(rbuf + 58, versions, sizeof(versions)); 1854 1855 return 0; 1856 } 1857 1858 /** 1859 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1860 * @args: device IDENTIFY data / SCSI command of interest. 1861 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1862 * 1863 * Returns list of inquiry VPD pages available. 1864 * 1865 * LOCKING: 1866 * spin_lock_irqsave(host lock) 1867 */ 1868 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1869 { 1870 int i, num_pages = 0; 1871 static const u8 pages[] = { 1872 0x00, /* page 0x00, this page */ 1873 0x80, /* page 0x80, unit serial no page */ 1874 0x83, /* page 0x83, device ident page */ 1875 0x89, /* page 0x89, ata info page */ 1876 0xb0, /* page 0xb0, block limits page */ 1877 0xb1, /* page 0xb1, block device characteristics page */ 1878 0xb2, /* page 0xb2, thin provisioning page */ 1879 0xb6, /* page 0xb6, zoned block device characteristics */ 1880 0xb9, /* page 0xb9, concurrent positioning ranges */ 1881 }; 1882 1883 for (i = 0; i < sizeof(pages); i++) { 1884 if (pages[i] == 0xb6 && 1885 !(args->dev->flags & ATA_DFLAG_ZAC)) 1886 continue; 1887 rbuf[num_pages + 4] = pages[i]; 1888 num_pages++; 1889 } 1890 rbuf[3] = num_pages; /* number of supported VPD pages */ 1891 return 0; 1892 } 1893 1894 /** 1895 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1896 * @args: device IDENTIFY data / SCSI command of interest. 1897 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1898 * 1899 * Returns ATA device serial number. 1900 * 1901 * LOCKING: 1902 * spin_lock_irqsave(host lock) 1903 */ 1904 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1905 { 1906 static const u8 hdr[] = { 1907 0, 1908 0x80, /* this page code */ 1909 0, 1910 ATA_ID_SERNO_LEN, /* page len */ 1911 }; 1912 1913 memcpy(rbuf, hdr, sizeof(hdr)); 1914 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1915 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1916 return 0; 1917 } 1918 1919 /** 1920 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1921 * @args: device IDENTIFY data / SCSI command of interest. 1922 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1923 * 1924 * Yields two logical unit device identification designators: 1925 * - vendor specific ASCII containing the ATA serial number 1926 * - SAT defined "t10 vendor id based" containing ASCII vendor 1927 * name ("ATA "), model and serial numbers. 1928 * 1929 * LOCKING: 1930 * spin_lock_irqsave(host lock) 1931 */ 1932 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 1933 { 1934 const int sat_model_serial_desc_len = 68; 1935 int num; 1936 1937 rbuf[1] = 0x83; /* this page code */ 1938 num = 4; 1939 1940 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1941 rbuf[num + 0] = 2; 1942 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1943 num += 4; 1944 ata_id_string(args->id, (unsigned char *) rbuf + num, 1945 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1946 num += ATA_ID_SERNO_LEN; 1947 1948 /* SAT defined lu model and serial numbers descriptor */ 1949 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1950 rbuf[num + 0] = 2; 1951 rbuf[num + 1] = 1; 1952 rbuf[num + 3] = sat_model_serial_desc_len; 1953 num += 4; 1954 memcpy(rbuf + num, "ATA ", 8); 1955 num += 8; 1956 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 1957 ATA_ID_PROD_LEN); 1958 num += ATA_ID_PROD_LEN; 1959 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 1960 ATA_ID_SERNO_LEN); 1961 num += ATA_ID_SERNO_LEN; 1962 1963 if (ata_id_has_wwn(args->id)) { 1964 /* SAT defined lu world wide name */ 1965 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 1966 rbuf[num + 0] = 1; 1967 rbuf[num + 1] = 3; 1968 rbuf[num + 3] = ATA_ID_WWN_LEN; 1969 num += 4; 1970 ata_id_string(args->id, (unsigned char *) rbuf + num, 1971 ATA_ID_WWN, ATA_ID_WWN_LEN); 1972 num += ATA_ID_WWN_LEN; 1973 } 1974 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 1975 return 0; 1976 } 1977 1978 /** 1979 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 1980 * @args: device IDENTIFY data / SCSI command of interest. 1981 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1982 * 1983 * Yields SAT-specified ATA VPD page. 1984 * 1985 * LOCKING: 1986 * spin_lock_irqsave(host lock) 1987 */ 1988 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 1989 { 1990 rbuf[1] = 0x89; /* our page code */ 1991 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 1992 rbuf[3] = (0x238 & 0xff); 1993 1994 memcpy(&rbuf[8], "linux ", 8); 1995 memcpy(&rbuf[16], "libata ", 16); 1996 memcpy(&rbuf[32], DRV_VERSION, 4); 1997 1998 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 1999 rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */ 2000 /* TODO: PMP? */ 2001 2002 /* we don't store the ATA device signature, so we fake it */ 2003 rbuf[38] = ATA_DRDY; /* really, this is Status reg */ 2004 rbuf[40] = 0x1; 2005 rbuf[48] = 0x1; 2006 2007 rbuf[56] = ATA_CMD_ID_ATA; 2008 2009 memcpy(&rbuf[60], &args->id[0], 512); 2010 return 0; 2011 } 2012 2013 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2014 { 2015 struct ata_device *dev = args->dev; 2016 u16 min_io_sectors; 2017 2018 rbuf[1] = 0xb0; 2019 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2020 2021 /* 2022 * Optimal transfer length granularity. 2023 * 2024 * This is always one physical block, but for disks with a smaller 2025 * logical than physical sector size we need to figure out what the 2026 * latter is. 2027 */ 2028 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2029 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2030 2031 /* 2032 * Optimal unmap granularity. 2033 * 2034 * The ATA spec doesn't even know about a granularity or alignment 2035 * for the TRIM command. We can leave away most of the unmap related 2036 * VPD page entries, but we have specifify a granularity to signal 2037 * that we support some form of unmap - in thise case via WRITE SAME 2038 * with the unmap bit set. 2039 */ 2040 if (ata_id_has_trim(args->id)) { 2041 u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM; 2042 2043 if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M) 2044 max_blocks = 128 << (20 - SECTOR_SHIFT); 2045 2046 put_unaligned_be64(max_blocks, &rbuf[36]); 2047 put_unaligned_be32(1, &rbuf[28]); 2048 } 2049 2050 return 0; 2051 } 2052 2053 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2054 { 2055 int form_factor = ata_id_form_factor(args->id); 2056 int media_rotation_rate = ata_id_rotation_rate(args->id); 2057 u8 zoned = ata_id_zoned_cap(args->id); 2058 2059 rbuf[1] = 0xb1; 2060 rbuf[3] = 0x3c; 2061 rbuf[4] = media_rotation_rate >> 8; 2062 rbuf[5] = media_rotation_rate; 2063 rbuf[7] = form_factor; 2064 if (zoned) 2065 rbuf[8] = (zoned << 4); 2066 2067 return 0; 2068 } 2069 2070 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2071 { 2072 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2073 rbuf[1] = 0xb2; 2074 rbuf[3] = 0x4; 2075 rbuf[5] = 1 << 6; /* TPWS */ 2076 2077 return 0; 2078 } 2079 2080 static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) 2081 { 2082 /* 2083 * zbc-r05 SCSI Zoned Block device characteristics VPD page 2084 */ 2085 rbuf[1] = 0xb6; 2086 rbuf[3] = 0x3C; 2087 2088 /* 2089 * URSWRZ bit is only meaningful for host-managed ZAC drives 2090 */ 2091 if (args->dev->zac_zoned_cap & 1) 2092 rbuf[4] |= 1; 2093 put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]); 2094 put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]); 2095 put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]); 2096 2097 return 0; 2098 } 2099 2100 static unsigned int ata_scsiop_inq_b9(struct ata_scsi_args *args, u8 *rbuf) 2101 { 2102 struct ata_cpr_log *cpr_log = args->dev->cpr_log; 2103 u8 *desc = &rbuf[64]; 2104 int i; 2105 2106 /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */ 2107 rbuf[1] = 0xb9; 2108 put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]); 2109 2110 for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) { 2111 desc[0] = cpr_log->cpr[i].num; 2112 desc[1] = cpr_log->cpr[i].num_storage_elements; 2113 put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]); 2114 put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[16]); 2115 } 2116 2117 return 0; 2118 } 2119 2120 /** 2121 * modecpy - Prepare response for MODE SENSE 2122 * @dest: output buffer 2123 * @src: data being copied 2124 * @n: length of mode page 2125 * @changeable: whether changeable parameters are requested 2126 * 2127 * Generate a generic MODE SENSE page for either current or changeable 2128 * parameters. 2129 * 2130 * LOCKING: 2131 * None. 2132 */ 2133 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2134 { 2135 if (changeable) { 2136 memcpy(dest, src, 2); 2137 memset(dest + 2, 0, n - 2); 2138 } else { 2139 memcpy(dest, src, n); 2140 } 2141 } 2142 2143 /** 2144 * ata_msense_caching - Simulate MODE SENSE caching info page 2145 * @id: device IDENTIFY data 2146 * @buf: output buffer 2147 * @changeable: whether changeable parameters are requested 2148 * 2149 * Generate a caching info page, which conditionally indicates 2150 * write caching to the SCSI layer, depending on device 2151 * capabilities. 2152 * 2153 * LOCKING: 2154 * None. 2155 */ 2156 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2157 { 2158 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2159 if (changeable) { 2160 buf[2] |= (1 << 2); /* ata_mselect_caching() */ 2161 } else { 2162 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */ 2163 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */ 2164 } 2165 return sizeof(def_cache_mpage); 2166 } 2167 2168 /* 2169 * Simulate MODE SENSE control mode page, sub-page 0. 2170 */ 2171 static unsigned int ata_msense_control_spg0(struct ata_device *dev, u8 *buf, 2172 bool changeable) 2173 { 2174 modecpy(buf, def_control_mpage, 2175 sizeof(def_control_mpage), changeable); 2176 if (changeable) { 2177 /* ata_mselect_control() */ 2178 buf[2] |= (1 << 2); 2179 } else { 2180 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 2181 2182 /* descriptor format sense data */ 2183 buf[2] |= (d_sense << 2); 2184 } 2185 2186 return sizeof(def_control_mpage); 2187 } 2188 2189 /* 2190 * Translate an ATA duration limit in microseconds to a SCSI duration limit 2191 * using the t2cdlunits 0xa (10ms). Since the SCSI duration limits are 2-bytes 2192 * only, take care of overflows. 2193 */ 2194 static inline u16 ata_xlat_cdl_limit(u8 *buf) 2195 { 2196 u32 limit = get_unaligned_le32(buf); 2197 2198 return min_t(u32, limit / 10000, 65535); 2199 } 2200 2201 /* 2202 * Simulate MODE SENSE control mode page, sub-pages 07h and 08h 2203 * (command duration limits T2A and T2B mode pages). 2204 */ 2205 static unsigned int ata_msense_control_spgt2(struct ata_device *dev, u8 *buf, 2206 u8 spg) 2207 { 2208 u8 *b, *cdl = dev->cdl, *desc; 2209 u32 policy; 2210 int i; 2211 2212 /* 2213 * Fill the subpage. The first four bytes of the T2A/T2B mode pages 2214 * are a header. The PAGE LENGTH field is the size of the page 2215 * excluding the header. 2216 */ 2217 buf[0] = CONTROL_MPAGE; 2218 buf[1] = spg; 2219 put_unaligned_be16(CDL_T2_SUB_MPAGE_LEN - 4, &buf[2]); 2220 if (spg == CDL_T2A_SUB_MPAGE) { 2221 /* 2222 * Read descriptors map to the T2A page: 2223 * set perf_vs_duration_guidleine. 2224 */ 2225 buf[7] = (cdl[0] & 0x03) << 4; 2226 desc = cdl + 64; 2227 } else { 2228 /* Write descriptors map to the T2B page */ 2229 desc = cdl + 288; 2230 } 2231 2232 /* Fill the T2 page descriptors */ 2233 b = &buf[8]; 2234 policy = get_unaligned_le32(&cdl[0]); 2235 for (i = 0; i < 7; i++, b += 32, desc += 32) { 2236 /* t2cdlunits: fixed to 10ms */ 2237 b[0] = 0x0a; 2238 2239 /* Max inactive time and its policy */ 2240 put_unaligned_be16(ata_xlat_cdl_limit(&desc[8]), &b[2]); 2241 b[6] = ((policy >> 8) & 0x0f) << 4; 2242 2243 /* Max active time and its policy */ 2244 put_unaligned_be16(ata_xlat_cdl_limit(&desc[4]), &b[4]); 2245 b[6] |= (policy >> 4) & 0x0f; 2246 2247 /* Command duration guideline and its policy */ 2248 put_unaligned_be16(ata_xlat_cdl_limit(&desc[16]), &b[10]); 2249 b[14] = policy & 0x0f; 2250 } 2251 2252 return CDL_T2_SUB_MPAGE_LEN; 2253 } 2254 2255 /* 2256 * Simulate MODE SENSE control mode page, sub-page f2h 2257 * (ATA feature control mode page). 2258 */ 2259 static unsigned int ata_msense_control_ata_feature(struct ata_device *dev, 2260 u8 *buf) 2261 { 2262 /* PS=0, SPF=1 */ 2263 buf[0] = CONTROL_MPAGE | (1 << 6); 2264 buf[1] = ATA_FEATURE_SUB_MPAGE; 2265 2266 /* 2267 * The first four bytes of ATA Feature Control mode page are a header. 2268 * The PAGE LENGTH field is the size of the page excluding the header. 2269 */ 2270 put_unaligned_be16(ATA_FEATURE_SUB_MPAGE_LEN - 4, &buf[2]); 2271 2272 if (dev->flags & ATA_DFLAG_CDL) 2273 buf[4] = 0x02; /* Support T2A and T2B pages */ 2274 else 2275 buf[4] = 0; 2276 2277 return ATA_FEATURE_SUB_MPAGE_LEN; 2278 } 2279 2280 /** 2281 * ata_msense_control - Simulate MODE SENSE control mode page 2282 * @dev: ATA device of interest 2283 * @buf: output buffer 2284 * @spg: sub-page code 2285 * @changeable: whether changeable parameters are requested 2286 * 2287 * Generate a generic MODE SENSE control mode page. 2288 * 2289 * LOCKING: 2290 * None. 2291 */ 2292 static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf, 2293 u8 spg, bool changeable) 2294 { 2295 unsigned int n; 2296 2297 switch (spg) { 2298 case 0: 2299 return ata_msense_control_spg0(dev, buf, changeable); 2300 case CDL_T2A_SUB_MPAGE: 2301 case CDL_T2B_SUB_MPAGE: 2302 return ata_msense_control_spgt2(dev, buf, spg); 2303 case ATA_FEATURE_SUB_MPAGE: 2304 return ata_msense_control_ata_feature(dev, buf); 2305 case ALL_SUB_MPAGES: 2306 n = ata_msense_control_spg0(dev, buf, changeable); 2307 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE); 2308 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE); 2309 n += ata_msense_control_ata_feature(dev, buf + n); 2310 return n; 2311 default: 2312 return 0; 2313 } 2314 } 2315 2316 /** 2317 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2318 * @buf: output buffer 2319 * @changeable: whether changeable parameters are requested 2320 * 2321 * Generate a generic MODE SENSE r/w error recovery page. 2322 * 2323 * LOCKING: 2324 * None. 2325 */ 2326 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2327 { 2328 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2329 changeable); 2330 return sizeof(def_rw_recovery_mpage); 2331 } 2332 2333 /** 2334 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2335 * @args: device IDENTIFY data / SCSI command of interest. 2336 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2337 * 2338 * Simulate MODE SENSE commands. Assume this is invoked for direct 2339 * access devices (e.g. disks) only. There should be no block 2340 * descriptor for other device types. 2341 * 2342 * LOCKING: 2343 * spin_lock_irqsave(host lock) 2344 */ 2345 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2346 { 2347 struct ata_device *dev = args->dev; 2348 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2349 static const u8 sat_blk_desc[] = { 2350 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2351 0, 2352 0, 0x2, 0x0 /* block length: 512 bytes */ 2353 }; 2354 u8 pg, spg; 2355 unsigned int ebd, page_control, six_byte; 2356 u8 dpofua = 0, bp = 0xff; 2357 u16 fp; 2358 2359 six_byte = (scsicmd[0] == MODE_SENSE); 2360 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2361 /* 2362 * LLBA bit in msense(10) ignored (compliant) 2363 */ 2364 2365 page_control = scsicmd[2] >> 6; 2366 switch (page_control) { 2367 case 0: /* current */ 2368 case 1: /* changeable */ 2369 case 2: /* defaults */ 2370 break; /* supported */ 2371 case 3: /* saved */ 2372 goto saving_not_supp; 2373 default: 2374 fp = 2; 2375 bp = 6; 2376 goto invalid_fld; 2377 } 2378 2379 if (six_byte) 2380 p += 4 + (ebd ? 8 : 0); 2381 else 2382 p += 8 + (ebd ? 8 : 0); 2383 2384 pg = scsicmd[2] & 0x3f; 2385 spg = scsicmd[3]; 2386 2387 /* 2388 * Supported subpages: all subpages and sub-pages 07h, 08h and f2h of 2389 * the control page. 2390 */ 2391 if (spg) { 2392 switch (spg) { 2393 case ALL_SUB_MPAGES: 2394 break; 2395 case CDL_T2A_SUB_MPAGE: 2396 case CDL_T2B_SUB_MPAGE: 2397 case ATA_FEATURE_SUB_MPAGE: 2398 if (dev->flags & ATA_DFLAG_CDL && pg == CONTROL_MPAGE) 2399 break; 2400 fallthrough; 2401 default: 2402 fp = 3; 2403 goto invalid_fld; 2404 } 2405 } 2406 2407 switch(pg) { 2408 case RW_RECOVERY_MPAGE: 2409 p += ata_msense_rw_recovery(p, page_control == 1); 2410 break; 2411 2412 case CACHE_MPAGE: 2413 p += ata_msense_caching(args->id, p, page_control == 1); 2414 break; 2415 2416 case CONTROL_MPAGE: 2417 p += ata_msense_control(args->dev, p, spg, page_control == 1); 2418 break; 2419 2420 case ALL_MPAGES: 2421 p += ata_msense_rw_recovery(p, page_control == 1); 2422 p += ata_msense_caching(args->id, p, page_control == 1); 2423 p += ata_msense_control(args->dev, p, spg, page_control == 1); 2424 break; 2425 2426 default: /* invalid page code */ 2427 fp = 2; 2428 goto invalid_fld; 2429 } 2430 2431 if (dev->flags & ATA_DFLAG_FUA) 2432 dpofua = 1 << 4; 2433 2434 if (six_byte) { 2435 rbuf[0] = p - rbuf - 1; 2436 rbuf[2] |= dpofua; 2437 if (ebd) { 2438 rbuf[3] = sizeof(sat_blk_desc); 2439 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2440 } 2441 } else { 2442 put_unaligned_be16(p - rbuf - 2, &rbuf[0]); 2443 rbuf[3] |= dpofua; 2444 if (ebd) { 2445 rbuf[7] = sizeof(sat_blk_desc); 2446 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2447 } 2448 } 2449 return 0; 2450 2451 invalid_fld: 2452 ata_scsi_set_invalid_field(dev, args->cmd, fp, bp); 2453 return 1; 2454 2455 saving_not_supp: 2456 ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2457 /* "Saving parameters not supported" */ 2458 return 1; 2459 } 2460 2461 /** 2462 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2463 * @args: device IDENTIFY data / SCSI command of interest. 2464 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2465 * 2466 * Simulate READ CAPACITY commands. 2467 * 2468 * LOCKING: 2469 * None. 2470 */ 2471 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2472 { 2473 struct ata_device *dev = args->dev; 2474 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2475 u32 sector_size; /* physical sector size in bytes */ 2476 u8 log2_per_phys; 2477 u16 lowest_aligned; 2478 2479 sector_size = ata_id_logical_sector_size(dev->id); 2480 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2481 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2482 2483 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2484 if (last_lba >= 0xffffffffULL) 2485 last_lba = 0xffffffff; 2486 2487 /* sector count, 32-bit */ 2488 rbuf[0] = last_lba >> (8 * 3); 2489 rbuf[1] = last_lba >> (8 * 2); 2490 rbuf[2] = last_lba >> (8 * 1); 2491 rbuf[3] = last_lba; 2492 2493 /* sector size */ 2494 rbuf[4] = sector_size >> (8 * 3); 2495 rbuf[5] = sector_size >> (8 * 2); 2496 rbuf[6] = sector_size >> (8 * 1); 2497 rbuf[7] = sector_size; 2498 } else { 2499 /* sector count, 64-bit */ 2500 rbuf[0] = last_lba >> (8 * 7); 2501 rbuf[1] = last_lba >> (8 * 6); 2502 rbuf[2] = last_lba >> (8 * 5); 2503 rbuf[3] = last_lba >> (8 * 4); 2504 rbuf[4] = last_lba >> (8 * 3); 2505 rbuf[5] = last_lba >> (8 * 2); 2506 rbuf[6] = last_lba >> (8 * 1); 2507 rbuf[7] = last_lba; 2508 2509 /* sector size */ 2510 rbuf[ 8] = sector_size >> (8 * 3); 2511 rbuf[ 9] = sector_size >> (8 * 2); 2512 rbuf[10] = sector_size >> (8 * 1); 2513 rbuf[11] = sector_size; 2514 2515 rbuf[12] = 0; 2516 rbuf[13] = log2_per_phys; 2517 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2518 rbuf[15] = lowest_aligned; 2519 2520 if (ata_id_has_trim(args->id) && 2521 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2522 rbuf[14] |= 0x80; /* LBPME */ 2523 2524 if (ata_id_has_zero_after_trim(args->id) && 2525 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2526 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2527 rbuf[14] |= 0x40; /* LBPRZ */ 2528 } 2529 } 2530 if (ata_id_zoned_cap(args->id) || 2531 args->dev->class == ATA_DEV_ZAC) 2532 rbuf[12] = (1 << 4); /* RC_BASIS */ 2533 } 2534 return 0; 2535 } 2536 2537 /** 2538 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2539 * @args: device IDENTIFY data / SCSI command of interest. 2540 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2541 * 2542 * Simulate REPORT LUNS command. 2543 * 2544 * LOCKING: 2545 * spin_lock_irqsave(host lock) 2546 */ 2547 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2548 { 2549 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2550 2551 return 0; 2552 } 2553 2554 /* 2555 * ATAPI devices typically report zero for their SCSI version, and sometimes 2556 * deviate from the spec WRT response data format. If SCSI version is 2557 * reported as zero like normal, then we make the following fixups: 2558 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a 2559 * modern device. 2560 * 2) Ensure response data format / ATAPI information are always correct. 2561 */ 2562 static void atapi_fixup_inquiry(struct scsi_cmnd *cmd) 2563 { 2564 u8 buf[4]; 2565 2566 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2567 if (buf[2] == 0) { 2568 buf[2] = 0x5; 2569 buf[3] = 0x32; 2570 } 2571 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2572 } 2573 2574 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2575 { 2576 struct scsi_cmnd *cmd = qc->scsicmd; 2577 unsigned int err_mask = qc->err_mask; 2578 2579 /* handle completion from EH */ 2580 if (unlikely(err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2581 2582 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2583 /* FIXME: not quite right; we don't want the 2584 * translation of taskfile registers into a 2585 * sense descriptors, since that's only 2586 * correct for ATA, not ATAPI 2587 */ 2588 ata_gen_passthru_sense(qc); 2589 } 2590 2591 /* SCSI EH automatically locks door if sdev->locked is 2592 * set. Sometimes door lock request continues to 2593 * fail, for example, when no media is present. This 2594 * creates a loop - SCSI EH issues door lock which 2595 * fails and gets invoked again to acquire sense data 2596 * for the failed command. 2597 * 2598 * If door lock fails, always clear sdev->locked to 2599 * avoid this infinite loop. 2600 * 2601 * This may happen before SCSI scan is complete. Make 2602 * sure qc->dev->sdev isn't NULL before dereferencing. 2603 */ 2604 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2605 qc->dev->sdev->locked = 0; 2606 2607 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2608 ata_qc_done(qc); 2609 return; 2610 } 2611 2612 /* successful completion path */ 2613 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0) 2614 atapi_fixup_inquiry(cmd); 2615 cmd->result = SAM_STAT_GOOD; 2616 2617 ata_qc_done(qc); 2618 } 2619 /** 2620 * atapi_xlat - Initialize PACKET taskfile 2621 * @qc: command structure to be initialized 2622 * 2623 * LOCKING: 2624 * spin_lock_irqsave(host lock) 2625 * 2626 * RETURNS: 2627 * Zero on success, non-zero on failure. 2628 */ 2629 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2630 { 2631 struct scsi_cmnd *scmd = qc->scsicmd; 2632 struct ata_device *dev = qc->dev; 2633 int nodata = (scmd->sc_data_direction == DMA_NONE); 2634 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2635 unsigned int nbytes; 2636 2637 memset(qc->cdb, 0, dev->cdb_len); 2638 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2639 2640 qc->complete_fn = atapi_qc_complete; 2641 2642 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2643 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2644 qc->tf.flags |= ATA_TFLAG_WRITE; 2645 } 2646 2647 qc->tf.command = ATA_CMD_PACKET; 2648 ata_qc_set_pc_nbytes(qc); 2649 2650 /* check whether ATAPI DMA is safe */ 2651 if (!nodata && !using_pio && atapi_check_dma(qc)) 2652 using_pio = 1; 2653 2654 /* Some controller variants snoop this value for Packet 2655 * transfers to do state machine and FIFO management. Thus we 2656 * want to set it properly, and for DMA where it is 2657 * effectively meaningless. 2658 */ 2659 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2660 2661 /* Most ATAPI devices which honor transfer chunk size don't 2662 * behave according to the spec when odd chunk size which 2663 * matches the transfer length is specified. If the number of 2664 * bytes to transfer is 2n+1. According to the spec, what 2665 * should happen is to indicate that 2n+1 is going to be 2666 * transferred and transfer 2n+2 bytes where the last byte is 2667 * padding. 2668 * 2669 * In practice, this doesn't happen. ATAPI devices first 2670 * indicate and transfer 2n bytes and then indicate and 2671 * transfer 2 bytes where the last byte is padding. 2672 * 2673 * This inconsistency confuses several controllers which 2674 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2675 * These controllers use actual number of transferred bytes to 2676 * update DMA pointer and transfer of 4n+2 bytes make those 2677 * controller push DMA pointer by 4n+4 bytes because SATA data 2678 * FISes are aligned to 4 bytes. This causes data corruption 2679 * and buffer overrun. 2680 * 2681 * Always setting nbytes to even number solves this problem 2682 * because then ATAPI devices don't have to split data at 2n 2683 * boundaries. 2684 */ 2685 if (nbytes & 0x1) 2686 nbytes++; 2687 2688 qc->tf.lbam = (nbytes & 0xFF); 2689 qc->tf.lbah = (nbytes >> 8); 2690 2691 if (nodata) 2692 qc->tf.protocol = ATAPI_PROT_NODATA; 2693 else if (using_pio) 2694 qc->tf.protocol = ATAPI_PROT_PIO; 2695 else { 2696 /* DMA data xfer */ 2697 qc->tf.protocol = ATAPI_PROT_DMA; 2698 qc->tf.feature |= ATAPI_PKT_DMA; 2699 2700 if ((dev->flags & ATA_DFLAG_DMADIR) && 2701 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2702 /* some SATA bridges need us to indicate data xfer direction */ 2703 qc->tf.feature |= ATAPI_DMADIR; 2704 } 2705 2706 2707 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2708 as ATAPI tape drives don't get this right otherwise */ 2709 return 0; 2710 } 2711 2712 static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno) 2713 { 2714 /* 2715 * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case), 2716 * or 2 (IDE master + slave case). However, the former case includes 2717 * libsas hosted devices which are numbered per scsi host, leading 2718 * to devno potentially being larger than 0 but with each struct 2719 * ata_device having its own struct ata_port and struct ata_link. 2720 * To accommodate these, ignore devno and always use device number 0. 2721 */ 2722 if (likely(!sata_pmp_attached(ap))) { 2723 int link_max_devices = ata_link_max_devices(&ap->link); 2724 2725 if (link_max_devices == 1) 2726 return &ap->link.device[0]; 2727 2728 if (devno < link_max_devices) 2729 return &ap->link.device[devno]; 2730 2731 return NULL; 2732 } 2733 2734 /* 2735 * For PMP-attached devices, the device number corresponds to C 2736 * (channel) of SCSI [H:C:I:L], indicating the port pmp link 2737 * for the device. 2738 */ 2739 if (devno < ap->nr_pmp_links) 2740 return &ap->pmp_link[devno].device[0]; 2741 2742 return NULL; 2743 } 2744 2745 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2746 const struct scsi_device *scsidev) 2747 { 2748 int devno; 2749 2750 /* skip commands not addressed to targets we simulate */ 2751 if (!sata_pmp_attached(ap)) { 2752 if (unlikely(scsidev->channel || scsidev->lun)) 2753 return NULL; 2754 devno = scsidev->id; 2755 } else { 2756 if (unlikely(scsidev->id || scsidev->lun)) 2757 return NULL; 2758 devno = scsidev->channel; 2759 } 2760 2761 return ata_find_dev(ap, devno); 2762 } 2763 2764 /** 2765 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2766 * @ap: ATA port to which the device is attached 2767 * @scsidev: SCSI device from which we derive the ATA device 2768 * 2769 * Given various information provided in struct scsi_cmnd, 2770 * map that onto an ATA bus, and using that mapping 2771 * determine which ata_device is associated with the 2772 * SCSI command to be sent. 2773 * 2774 * LOCKING: 2775 * spin_lock_irqsave(host lock) 2776 * 2777 * RETURNS: 2778 * Associated ATA device, or %NULL if not found. 2779 */ 2780 struct ata_device * 2781 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2782 { 2783 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2784 2785 if (unlikely(!dev || !ata_dev_enabled(dev))) 2786 return NULL; 2787 2788 return dev; 2789 } 2790 2791 /* 2792 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2793 * @byte1: Byte 1 from pass-thru CDB. 2794 * 2795 * RETURNS: 2796 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2797 */ 2798 static u8 2799 ata_scsi_map_proto(u8 byte1) 2800 { 2801 switch((byte1 & 0x1e) >> 1) { 2802 case 3: /* Non-data */ 2803 return ATA_PROT_NODATA; 2804 2805 case 6: /* DMA */ 2806 case 10: /* UDMA Data-in */ 2807 case 11: /* UDMA Data-Out */ 2808 return ATA_PROT_DMA; 2809 2810 case 4: /* PIO Data-in */ 2811 case 5: /* PIO Data-out */ 2812 return ATA_PROT_PIO; 2813 2814 case 12: /* FPDMA */ 2815 return ATA_PROT_NCQ; 2816 2817 case 0: /* Hard Reset */ 2818 case 1: /* SRST */ 2819 case 8: /* Device Diagnostic */ 2820 case 9: /* Device Reset */ 2821 case 7: /* DMA Queued */ 2822 case 15: /* Return Response Info */ 2823 default: /* Reserved */ 2824 break; 2825 } 2826 2827 return ATA_PROT_UNKNOWN; 2828 } 2829 2830 /** 2831 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2832 * @qc: command structure to be initialized 2833 * 2834 * Handles either 12, 16, or 32-byte versions of the CDB. 2835 * 2836 * RETURNS: 2837 * Zero on success, non-zero on failure. 2838 */ 2839 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2840 { 2841 struct ata_taskfile *tf = &(qc->tf); 2842 struct scsi_cmnd *scmd = qc->scsicmd; 2843 struct ata_device *dev = qc->dev; 2844 const u8 *cdb = scmd->cmnd; 2845 u16 fp; 2846 u16 cdb_offset = 0; 2847 2848 /* 7Fh variable length cmd means a ata pass-thru(32) */ 2849 if (cdb[0] == VARIABLE_LENGTH_CMD) 2850 cdb_offset = 9; 2851 2852 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]); 2853 if (tf->protocol == ATA_PROT_UNKNOWN) { 2854 fp = 1; 2855 goto invalid_fld; 2856 } 2857 2858 if ((cdb[2 + cdb_offset] & 0x3) == 0) { 2859 /* 2860 * When T_LENGTH is zero (No data is transferred), dir should 2861 * be DMA_NONE. 2862 */ 2863 if (scmd->sc_data_direction != DMA_NONE) { 2864 fp = 2 + cdb_offset; 2865 goto invalid_fld; 2866 } 2867 2868 if (ata_is_ncq(tf->protocol)) 2869 tf->protocol = ATA_PROT_NCQ_NODATA; 2870 } 2871 2872 /* enable LBA */ 2873 tf->flags |= ATA_TFLAG_LBA; 2874 2875 /* 2876 * 12 and 16 byte CDBs use different offsets to 2877 * provide the various register values. 2878 */ 2879 switch (cdb[0]) { 2880 case ATA_16: 2881 /* 2882 * 16-byte CDB - may contain extended commands. 2883 * 2884 * If that is the case, copy the upper byte register values. 2885 */ 2886 if (cdb[1] & 0x01) { 2887 tf->hob_feature = cdb[3]; 2888 tf->hob_nsect = cdb[5]; 2889 tf->hob_lbal = cdb[7]; 2890 tf->hob_lbam = cdb[9]; 2891 tf->hob_lbah = cdb[11]; 2892 tf->flags |= ATA_TFLAG_LBA48; 2893 } else 2894 tf->flags &= ~ATA_TFLAG_LBA48; 2895 2896 /* 2897 * Always copy low byte, device and command registers. 2898 */ 2899 tf->feature = cdb[4]; 2900 tf->nsect = cdb[6]; 2901 tf->lbal = cdb[8]; 2902 tf->lbam = cdb[10]; 2903 tf->lbah = cdb[12]; 2904 tf->device = cdb[13]; 2905 tf->command = cdb[14]; 2906 break; 2907 case ATA_12: 2908 /* 2909 * 12-byte CDB - incapable of extended commands. 2910 */ 2911 tf->flags &= ~ATA_TFLAG_LBA48; 2912 2913 tf->feature = cdb[3]; 2914 tf->nsect = cdb[4]; 2915 tf->lbal = cdb[5]; 2916 tf->lbam = cdb[6]; 2917 tf->lbah = cdb[7]; 2918 tf->device = cdb[8]; 2919 tf->command = cdb[9]; 2920 break; 2921 default: 2922 /* 2923 * 32-byte CDB - may contain extended command fields. 2924 * 2925 * If that is the case, copy the upper byte register values. 2926 */ 2927 if (cdb[10] & 0x01) { 2928 tf->hob_feature = cdb[20]; 2929 tf->hob_nsect = cdb[22]; 2930 tf->hob_lbal = cdb[16]; 2931 tf->hob_lbam = cdb[15]; 2932 tf->hob_lbah = cdb[14]; 2933 tf->flags |= ATA_TFLAG_LBA48; 2934 } else 2935 tf->flags &= ~ATA_TFLAG_LBA48; 2936 2937 tf->feature = cdb[21]; 2938 tf->nsect = cdb[23]; 2939 tf->lbal = cdb[19]; 2940 tf->lbam = cdb[18]; 2941 tf->lbah = cdb[17]; 2942 tf->device = cdb[24]; 2943 tf->command = cdb[25]; 2944 tf->auxiliary = get_unaligned_be32(&cdb[28]); 2945 break; 2946 } 2947 2948 /* For NCQ commands copy the tag value */ 2949 if (ata_is_ncq(tf->protocol)) 2950 tf->nsect = qc->hw_tag << 3; 2951 2952 /* enforce correct master/slave bit */ 2953 tf->device = dev->devno ? 2954 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2955 2956 switch (tf->command) { 2957 /* READ/WRITE LONG use a non-standard sect_size */ 2958 case ATA_CMD_READ_LONG: 2959 case ATA_CMD_READ_LONG_ONCE: 2960 case ATA_CMD_WRITE_LONG: 2961 case ATA_CMD_WRITE_LONG_ONCE: 2962 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) { 2963 fp = 1; 2964 goto invalid_fld; 2965 } 2966 qc->sect_size = scsi_bufflen(scmd); 2967 break; 2968 2969 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2970 case ATA_CMD_CFA_WRITE_NE: 2971 case ATA_CMD_CFA_TRANS_SECT: 2972 case ATA_CMD_CFA_WRITE_MULT_NE: 2973 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2974 case ATA_CMD_READ: 2975 case ATA_CMD_READ_EXT: 2976 case ATA_CMD_READ_QUEUED: 2977 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2978 case ATA_CMD_FPDMA_READ: 2979 case ATA_CMD_READ_MULTI: 2980 case ATA_CMD_READ_MULTI_EXT: 2981 case ATA_CMD_PIO_READ: 2982 case ATA_CMD_PIO_READ_EXT: 2983 case ATA_CMD_READ_STREAM_DMA_EXT: 2984 case ATA_CMD_READ_STREAM_EXT: 2985 case ATA_CMD_VERIFY: 2986 case ATA_CMD_VERIFY_EXT: 2987 case ATA_CMD_WRITE: 2988 case ATA_CMD_WRITE_EXT: 2989 case ATA_CMD_WRITE_FUA_EXT: 2990 case ATA_CMD_WRITE_QUEUED: 2991 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2992 case ATA_CMD_FPDMA_WRITE: 2993 case ATA_CMD_WRITE_MULTI: 2994 case ATA_CMD_WRITE_MULTI_EXT: 2995 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2996 case ATA_CMD_PIO_WRITE: 2997 case ATA_CMD_PIO_WRITE_EXT: 2998 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2999 case ATA_CMD_WRITE_STREAM_EXT: 3000 qc->sect_size = scmd->device->sector_size; 3001 break; 3002 3003 /* Everything else uses 512 byte "sectors" */ 3004 default: 3005 qc->sect_size = ATA_SECT_SIZE; 3006 } 3007 3008 /* 3009 * Set flags so that all registers will be written, pass on 3010 * write indication (used for PIO/DMA setup), result TF is 3011 * copied back and we don't whine too much about its failure. 3012 */ 3013 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3014 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3015 tf->flags |= ATA_TFLAG_WRITE; 3016 3017 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3018 3019 /* 3020 * Set transfer length. 3021 * 3022 * TODO: find out if we need to do more here to 3023 * cover scatter/gather case. 3024 */ 3025 ata_qc_set_pc_nbytes(qc); 3026 3027 /* We may not issue DMA commands if no DMA mode is set */ 3028 if (tf->protocol == ATA_PROT_DMA && !ata_dma_enabled(dev)) { 3029 fp = 1; 3030 goto invalid_fld; 3031 } 3032 3033 /* We may not issue NCQ commands to devices not supporting NCQ */ 3034 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) { 3035 fp = 1; 3036 goto invalid_fld; 3037 } 3038 3039 /* sanity check for pio multi commands */ 3040 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) { 3041 fp = 1; 3042 goto invalid_fld; 3043 } 3044 3045 if (is_multi_taskfile(tf)) { 3046 unsigned int multi_count = 1 << (cdb[1] >> 5); 3047 3048 /* compare the passed through multi_count 3049 * with the cached multi_count of libata 3050 */ 3051 if (multi_count != dev->multi_count) 3052 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3053 multi_count); 3054 } 3055 3056 /* 3057 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3058 * SET_FEATURES - XFER MODE must be preceded/succeeded 3059 * by an update to hardware-specific registers for each 3060 * controller (i.e. the reason for ->set_piomode(), 3061 * ->set_dmamode(), and ->post_set_mode() hooks). 3062 */ 3063 if (tf->command == ATA_CMD_SET_FEATURES && 3064 tf->feature == SETFEATURES_XFER) { 3065 fp = (cdb[0] == ATA_16) ? 4 : 3; 3066 goto invalid_fld; 3067 } 3068 3069 /* 3070 * Filter TPM commands by default. These provide an 3071 * essentially uncontrolled encrypted "back door" between 3072 * applications and the disk. Set libata.allow_tpm=1 if you 3073 * have a real reason for wanting to use them. This ensures 3074 * that installed software cannot easily mess stuff up without 3075 * user intent. DVR type users will probably ship with this enabled 3076 * for movie content management. 3077 * 3078 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3079 * for this and should do in future but that it is not sufficient as 3080 * DCS is an optional feature set. Thus we also do the software filter 3081 * so that we comply with the TC consortium stated goal that the user 3082 * can turn off TC features of their system. 3083 */ 3084 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) { 3085 fp = (cdb[0] == ATA_16) ? 14 : 9; 3086 goto invalid_fld; 3087 } 3088 3089 return 0; 3090 3091 invalid_fld: 3092 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff); 3093 return 1; 3094 } 3095 3096 /** 3097 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim 3098 * @cmd: SCSI command being translated 3099 * @trmax: Maximum number of entries that will fit in sector_size bytes. 3100 * @sector: Starting sector 3101 * @count: Total Range of request in logical sectors 3102 * 3103 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted 3104 * descriptor. 3105 * 3106 * Upto 64 entries of the format: 3107 * 63:48 Range Length 3108 * 47:0 LBA 3109 * 3110 * Range Length of 0 is ignored. 3111 * LBA's should be sorted order and not overlap. 3112 * 3113 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET 3114 * 3115 * Return: Number of bytes copied into sglist. 3116 */ 3117 static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax, 3118 u64 sector, u32 count) 3119 { 3120 struct scsi_device *sdp = cmd->device; 3121 size_t len = sdp->sector_size; 3122 size_t r; 3123 __le64 *buf; 3124 u32 i = 0; 3125 unsigned long flags; 3126 3127 WARN_ON(len > ATA_SCSI_RBUF_SIZE); 3128 3129 if (len > ATA_SCSI_RBUF_SIZE) 3130 len = ATA_SCSI_RBUF_SIZE; 3131 3132 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 3133 buf = ((void *)ata_scsi_rbuf); 3134 memset(buf, 0, len); 3135 while (i < trmax) { 3136 u64 entry = sector | 3137 ((u64)(count > 0xffff ? 0xffff : count) << 48); 3138 buf[i++] = __cpu_to_le64(entry); 3139 if (count <= 0xffff) 3140 break; 3141 count -= 0xffff; 3142 sector += 0xffff; 3143 } 3144 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len); 3145 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 3146 3147 return r; 3148 } 3149 3150 /** 3151 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same 3152 * @qc: Command to be translated 3153 * 3154 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or 3155 * an SCT Write Same command. 3156 * Based on WRITE SAME has the UNMAP flag: 3157 * 3158 * - When set translate to DSM TRIM 3159 * - When clear translate to SCT Write Same 3160 */ 3161 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3162 { 3163 struct ata_taskfile *tf = &qc->tf; 3164 struct scsi_cmnd *scmd = qc->scsicmd; 3165 struct scsi_device *sdp = scmd->device; 3166 size_t len = sdp->sector_size; 3167 struct ata_device *dev = qc->dev; 3168 const u8 *cdb = scmd->cmnd; 3169 u64 block; 3170 u32 n_block; 3171 const u32 trmax = len >> 3; 3172 u32 size; 3173 u16 fp; 3174 u8 bp = 0xff; 3175 u8 unmap = cdb[1] & 0x8; 3176 3177 /* we may not issue DMA commands if no DMA mode is set */ 3178 if (unlikely(!ata_dma_enabled(dev))) 3179 goto invalid_opcode; 3180 3181 /* 3182 * We only allow sending this command through the block layer, 3183 * as it modifies the DATA OUT buffer, which would corrupt user 3184 * memory for SG_IO commands. 3185 */ 3186 if (unlikely(blk_rq_is_passthrough(scsi_cmd_to_rq(scmd)))) 3187 goto invalid_opcode; 3188 3189 if (unlikely(scmd->cmd_len < 16)) { 3190 fp = 15; 3191 goto invalid_fld; 3192 } 3193 scsi_16_lba_len(cdb, &block, &n_block); 3194 3195 if (!unmap || 3196 (dev->horkage & ATA_HORKAGE_NOTRIM) || 3197 !ata_id_has_trim(dev->id)) { 3198 fp = 1; 3199 bp = 3; 3200 goto invalid_fld; 3201 } 3202 /* If the request is too large the cmd is invalid */ 3203 if (n_block > 0xffff * trmax) { 3204 fp = 2; 3205 goto invalid_fld; 3206 } 3207 3208 /* 3209 * WRITE SAME always has a sector sized buffer as payload, this 3210 * should never be a multiple entry S/G list. 3211 */ 3212 if (!scsi_sg_count(scmd)) 3213 goto invalid_param_len; 3214 3215 /* 3216 * size must match sector size in bytes 3217 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count) 3218 * is defined as number of 512 byte blocks to be transferred. 3219 */ 3220 3221 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); 3222 if (size != len) 3223 goto invalid_param_len; 3224 3225 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3226 /* Newer devices support queued TRIM commands */ 3227 tf->protocol = ATA_PROT_NCQ; 3228 tf->command = ATA_CMD_FPDMA_SEND; 3229 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3230 tf->nsect = qc->hw_tag << 3; 3231 tf->hob_feature = (size / 512) >> 8; 3232 tf->feature = size / 512; 3233 3234 tf->auxiliary = 1; 3235 } else { 3236 tf->protocol = ATA_PROT_DMA; 3237 tf->hob_feature = 0; 3238 tf->feature = ATA_DSM_TRIM; 3239 tf->hob_nsect = (size / 512) >> 8; 3240 tf->nsect = size / 512; 3241 tf->command = ATA_CMD_DSM; 3242 } 3243 3244 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3245 ATA_TFLAG_WRITE; 3246 3247 ata_qc_set_pc_nbytes(qc); 3248 3249 return 0; 3250 3251 invalid_fld: 3252 ata_scsi_set_invalid_field(dev, scmd, fp, bp); 3253 return 1; 3254 invalid_param_len: 3255 /* "Parameter list length error" */ 3256 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3257 return 1; 3258 invalid_opcode: 3259 /* "Invalid command operation code" */ 3260 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0); 3261 return 1; 3262 } 3263 3264 /** 3265 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN 3266 * @args: device MAINTENANCE_IN data / SCSI command of interest. 3267 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 3268 * 3269 * Yields a subset to satisfy scsi_report_opcode() 3270 * 3271 * LOCKING: 3272 * spin_lock_irqsave(host lock) 3273 */ 3274 static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf) 3275 { 3276 struct ata_device *dev = args->dev; 3277 u8 *cdb = args->cmd->cmnd; 3278 u8 supported = 0, cdlp = 0, rwcdlp = 0; 3279 unsigned int err = 0; 3280 3281 if (cdb[2] != 1 && cdb[2] != 3) { 3282 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]); 3283 err = 2; 3284 goto out; 3285 } 3286 3287 switch (cdb[3]) { 3288 case INQUIRY: 3289 case MODE_SENSE: 3290 case MODE_SENSE_10: 3291 case READ_CAPACITY: 3292 case SERVICE_ACTION_IN_16: 3293 case REPORT_LUNS: 3294 case REQUEST_SENSE: 3295 case SYNCHRONIZE_CACHE: 3296 case SYNCHRONIZE_CACHE_16: 3297 case REZERO_UNIT: 3298 case SEEK_6: 3299 case SEEK_10: 3300 case TEST_UNIT_READY: 3301 case SEND_DIAGNOSTIC: 3302 case MAINTENANCE_IN: 3303 case READ_6: 3304 case READ_10: 3305 case WRITE_6: 3306 case WRITE_10: 3307 case ATA_12: 3308 case ATA_16: 3309 case VERIFY: 3310 case VERIFY_16: 3311 case MODE_SELECT: 3312 case MODE_SELECT_10: 3313 case START_STOP: 3314 supported = 3; 3315 break; 3316 case READ_16: 3317 supported = 3; 3318 if (dev->flags & ATA_DFLAG_CDL) { 3319 /* 3320 * CDL read descriptors map to the T2A page, that is, 3321 * rwcdlp = 0x01 and cdlp = 0x01 3322 */ 3323 rwcdlp = 0x01; 3324 cdlp = 0x01 << 3; 3325 } 3326 break; 3327 case WRITE_16: 3328 supported = 3; 3329 if (dev->flags & ATA_DFLAG_CDL) { 3330 /* 3331 * CDL write descriptors map to the T2B page, that is, 3332 * rwcdlp = 0x01 and cdlp = 0x02 3333 */ 3334 rwcdlp = 0x01; 3335 cdlp = 0x02 << 3; 3336 } 3337 break; 3338 case ZBC_IN: 3339 case ZBC_OUT: 3340 if (ata_id_zoned_cap(dev->id) || 3341 dev->class == ATA_DEV_ZAC) 3342 supported = 3; 3343 break; 3344 case SECURITY_PROTOCOL_IN: 3345 case SECURITY_PROTOCOL_OUT: 3346 if (dev->flags & ATA_DFLAG_TRUSTED) 3347 supported = 3; 3348 break; 3349 default: 3350 break; 3351 } 3352 out: 3353 /* One command format */ 3354 rbuf[0] = rwcdlp; 3355 rbuf[1] = cdlp | supported; 3356 return err; 3357 } 3358 3359 /** 3360 * ata_scsi_report_zones_complete - convert ATA output 3361 * @qc: command structure returning the data 3362 * 3363 * Convert T-13 little-endian field representation into 3364 * T-10 big-endian field representation. 3365 * What a mess. 3366 */ 3367 static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc) 3368 { 3369 struct scsi_cmnd *scmd = qc->scsicmd; 3370 struct sg_mapping_iter miter; 3371 unsigned long flags; 3372 unsigned int bytes = 0; 3373 3374 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd), 3375 SG_MITER_TO_SG | SG_MITER_ATOMIC); 3376 3377 local_irq_save(flags); 3378 while (sg_miter_next(&miter)) { 3379 unsigned int offset = 0; 3380 3381 if (bytes == 0) { 3382 char *hdr; 3383 u32 list_length; 3384 u64 max_lba, opt_lba; 3385 u16 same; 3386 3387 /* Swizzle header */ 3388 hdr = miter.addr; 3389 list_length = get_unaligned_le32(&hdr[0]); 3390 same = get_unaligned_le16(&hdr[4]); 3391 max_lba = get_unaligned_le64(&hdr[8]); 3392 opt_lba = get_unaligned_le64(&hdr[16]); 3393 put_unaligned_be32(list_length, &hdr[0]); 3394 hdr[4] = same & 0xf; 3395 put_unaligned_be64(max_lba, &hdr[8]); 3396 put_unaligned_be64(opt_lba, &hdr[16]); 3397 offset += 64; 3398 bytes += 64; 3399 } 3400 while (offset < miter.length) { 3401 char *rec; 3402 u8 cond, type, non_seq, reset; 3403 u64 size, start, wp; 3404 3405 /* Swizzle zone descriptor */ 3406 rec = miter.addr + offset; 3407 type = rec[0] & 0xf; 3408 cond = (rec[1] >> 4) & 0xf; 3409 non_seq = (rec[1] & 2); 3410 reset = (rec[1] & 1); 3411 size = get_unaligned_le64(&rec[8]); 3412 start = get_unaligned_le64(&rec[16]); 3413 wp = get_unaligned_le64(&rec[24]); 3414 rec[0] = type; 3415 rec[1] = (cond << 4) | non_seq | reset; 3416 put_unaligned_be64(size, &rec[8]); 3417 put_unaligned_be64(start, &rec[16]); 3418 put_unaligned_be64(wp, &rec[24]); 3419 WARN_ON(offset + 64 > miter.length); 3420 offset += 64; 3421 bytes += 64; 3422 } 3423 } 3424 sg_miter_stop(&miter); 3425 local_irq_restore(flags); 3426 3427 ata_scsi_qc_complete(qc); 3428 } 3429 3430 static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc) 3431 { 3432 struct ata_taskfile *tf = &qc->tf; 3433 struct scsi_cmnd *scmd = qc->scsicmd; 3434 const u8 *cdb = scmd->cmnd; 3435 u16 sect, fp = (u16)-1; 3436 u8 sa, options, bp = 0xff; 3437 u64 block; 3438 u32 n_block; 3439 3440 if (unlikely(scmd->cmd_len < 16)) { 3441 ata_dev_warn(qc->dev, "invalid cdb length %d\n", 3442 scmd->cmd_len); 3443 fp = 15; 3444 goto invalid_fld; 3445 } 3446 scsi_16_lba_len(cdb, &block, &n_block); 3447 if (n_block != scsi_bufflen(scmd)) { 3448 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n", 3449 n_block, scsi_bufflen(scmd)); 3450 goto invalid_param_len; 3451 } 3452 sa = cdb[1] & 0x1f; 3453 if (sa != ZI_REPORT_ZONES) { 3454 ata_dev_warn(qc->dev, "invalid service action %d\n", sa); 3455 fp = 1; 3456 goto invalid_fld; 3457 } 3458 /* 3459 * ZAC allows only for transfers in 512 byte blocks, 3460 * and uses a 16 bit value for the transfer count. 3461 */ 3462 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) { 3463 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block); 3464 goto invalid_param_len; 3465 } 3466 sect = n_block / 512; 3467 options = cdb[14] & 0xbf; 3468 3469 if (ata_ncq_enabled(qc->dev) && 3470 ata_fpdma_zac_mgmt_in_supported(qc->dev)) { 3471 tf->protocol = ATA_PROT_NCQ; 3472 tf->command = ATA_CMD_FPDMA_RECV; 3473 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f; 3474 tf->nsect = qc->hw_tag << 3; 3475 tf->feature = sect & 0xff; 3476 tf->hob_feature = (sect >> 8) & 0xff; 3477 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8); 3478 } else { 3479 tf->command = ATA_CMD_ZAC_MGMT_IN; 3480 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES; 3481 tf->protocol = ATA_PROT_DMA; 3482 tf->hob_feature = options; 3483 tf->hob_nsect = (sect >> 8) & 0xff; 3484 tf->nsect = sect & 0xff; 3485 } 3486 tf->device = ATA_LBA; 3487 tf->lbah = (block >> 16) & 0xff; 3488 tf->lbam = (block >> 8) & 0xff; 3489 tf->lbal = block & 0xff; 3490 tf->hob_lbah = (block >> 40) & 0xff; 3491 tf->hob_lbam = (block >> 32) & 0xff; 3492 tf->hob_lbal = (block >> 24) & 0xff; 3493 3494 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3495 qc->flags |= ATA_QCFLAG_RESULT_TF; 3496 3497 ata_qc_set_pc_nbytes(qc); 3498 3499 qc->complete_fn = ata_scsi_report_zones_complete; 3500 3501 return 0; 3502 3503 invalid_fld: 3504 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3505 return 1; 3506 3507 invalid_param_len: 3508 /* "Parameter list length error" */ 3509 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3510 return 1; 3511 } 3512 3513 static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc) 3514 { 3515 struct ata_taskfile *tf = &qc->tf; 3516 struct scsi_cmnd *scmd = qc->scsicmd; 3517 struct ata_device *dev = qc->dev; 3518 const u8 *cdb = scmd->cmnd; 3519 u8 all, sa; 3520 u64 block; 3521 u32 n_block; 3522 u16 fp = (u16)-1; 3523 3524 if (unlikely(scmd->cmd_len < 16)) { 3525 fp = 15; 3526 goto invalid_fld; 3527 } 3528 3529 sa = cdb[1] & 0x1f; 3530 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) && 3531 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) { 3532 fp = 1; 3533 goto invalid_fld; 3534 } 3535 3536 scsi_16_lba_len(cdb, &block, &n_block); 3537 if (n_block) { 3538 /* 3539 * ZAC MANAGEMENT OUT doesn't define any length 3540 */ 3541 goto invalid_param_len; 3542 } 3543 3544 all = cdb[14] & 0x1; 3545 if (all) { 3546 /* 3547 * Ignore the block address (zone ID) as defined by ZBC. 3548 */ 3549 block = 0; 3550 } else if (block >= dev->n_sectors) { 3551 /* 3552 * Block must be a valid zone ID (a zone start LBA). 3553 */ 3554 fp = 2; 3555 goto invalid_fld; 3556 } 3557 3558 if (ata_ncq_enabled(qc->dev) && 3559 ata_fpdma_zac_mgmt_out_supported(qc->dev)) { 3560 tf->protocol = ATA_PROT_NCQ_NODATA; 3561 tf->command = ATA_CMD_NCQ_NON_DATA; 3562 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT; 3563 tf->nsect = qc->hw_tag << 3; 3564 tf->auxiliary = sa | ((u16)all << 8); 3565 } else { 3566 tf->protocol = ATA_PROT_NODATA; 3567 tf->command = ATA_CMD_ZAC_MGMT_OUT; 3568 tf->feature = sa; 3569 tf->hob_feature = all; 3570 } 3571 tf->lbah = (block >> 16) & 0xff; 3572 tf->lbam = (block >> 8) & 0xff; 3573 tf->lbal = block & 0xff; 3574 tf->hob_lbah = (block >> 40) & 0xff; 3575 tf->hob_lbam = (block >> 32) & 0xff; 3576 tf->hob_lbal = (block >> 24) & 0xff; 3577 tf->device = ATA_LBA; 3578 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3579 3580 return 0; 3581 3582 invalid_fld: 3583 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 3584 return 1; 3585 invalid_param_len: 3586 /* "Parameter list length error" */ 3587 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3588 return 1; 3589 } 3590 3591 /** 3592 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3593 * @qc: Storage for translated ATA taskfile 3594 * @buf: input buffer 3595 * @len: number of valid bytes in the input buffer 3596 * @fp: out parameter for the failed field on error 3597 * 3598 * Prepare a taskfile to modify caching information for the device. 3599 * 3600 * LOCKING: 3601 * None. 3602 */ 3603 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3604 const u8 *buf, int len, u16 *fp) 3605 { 3606 struct ata_taskfile *tf = &qc->tf; 3607 struct ata_device *dev = qc->dev; 3608 u8 mpage[CACHE_MPAGE_LEN]; 3609 u8 wce; 3610 int i; 3611 3612 /* 3613 * The first two bytes of def_cache_mpage are a header, so offsets 3614 * in mpage are off by 2 compared to buf. Same for len. 3615 */ 3616 3617 if (len != CACHE_MPAGE_LEN - 2) { 3618 *fp = min(len, CACHE_MPAGE_LEN - 2); 3619 return -EINVAL; 3620 } 3621 3622 wce = buf[0] & (1 << 2); 3623 3624 /* 3625 * Check that read-only bits are not modified. 3626 */ 3627 ata_msense_caching(dev->id, mpage, false); 3628 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) { 3629 if (i == 0) 3630 continue; 3631 if (mpage[i + 2] != buf[i]) { 3632 *fp = i; 3633 return -EINVAL; 3634 } 3635 } 3636 3637 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3638 tf->protocol = ATA_PROT_NODATA; 3639 tf->nsect = 0; 3640 tf->command = ATA_CMD_SET_FEATURES; 3641 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3642 return 0; 3643 } 3644 3645 /* 3646 * Simulate MODE SELECT control mode page, sub-page 0. 3647 */ 3648 static int ata_mselect_control_spg0(struct ata_queued_cmd *qc, 3649 const u8 *buf, int len, u16 *fp) 3650 { 3651 struct ata_device *dev = qc->dev; 3652 u8 mpage[CONTROL_MPAGE_LEN]; 3653 u8 d_sense; 3654 int i; 3655 3656 /* 3657 * The first two bytes of def_control_mpage are a header, so offsets 3658 * in mpage are off by 2 compared to buf. Same for len. 3659 */ 3660 3661 if (len != CONTROL_MPAGE_LEN - 2) { 3662 *fp = min(len, CONTROL_MPAGE_LEN - 2); 3663 return -EINVAL; 3664 } 3665 3666 d_sense = buf[0] & (1 << 2); 3667 3668 /* 3669 * Check that read-only bits are not modified. 3670 */ 3671 ata_msense_control_spg0(dev, mpage, false); 3672 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) { 3673 if (i == 0) 3674 continue; 3675 if (mpage[2 + i] != buf[i]) { 3676 *fp = i; 3677 return -EINVAL; 3678 } 3679 } 3680 if (d_sense & (1 << 2)) 3681 dev->flags |= ATA_DFLAG_D_SENSE; 3682 else 3683 dev->flags &= ~ATA_DFLAG_D_SENSE; 3684 return 0; 3685 } 3686 3687 /* 3688 * Translate MODE SELECT control mode page, sub-pages f2h (ATA feature mode 3689 * page) into a SET FEATURES command. 3690 */ 3691 static unsigned int ata_mselect_control_ata_feature(struct ata_queued_cmd *qc, 3692 const u8 *buf, int len, 3693 u16 *fp) 3694 { 3695 struct ata_device *dev = qc->dev; 3696 struct ata_taskfile *tf = &qc->tf; 3697 u8 cdl_action; 3698 3699 /* 3700 * The first four bytes of ATA Feature Control mode page are a header, 3701 * so offsets in mpage are off by 4 compared to buf. Same for len. 3702 */ 3703 if (len != ATA_FEATURE_SUB_MPAGE_LEN - 4) { 3704 *fp = min(len, ATA_FEATURE_SUB_MPAGE_LEN - 4); 3705 return -EINVAL; 3706 } 3707 3708 /* Check cdl_ctrl */ 3709 switch (buf[0] & 0x03) { 3710 case 0: 3711 /* Disable CDL */ 3712 cdl_action = 0; 3713 dev->flags &= ~ATA_DFLAG_CDL_ENABLED; 3714 break; 3715 case 0x02: 3716 /* Enable CDL T2A/T2B: NCQ priority must be disabled */ 3717 if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED) { 3718 ata_dev_err(dev, 3719 "NCQ priority must be disabled to enable CDL\n"); 3720 return -EINVAL; 3721 } 3722 cdl_action = 1; 3723 dev->flags |= ATA_DFLAG_CDL_ENABLED; 3724 break; 3725 default: 3726 *fp = 0; 3727 return -EINVAL; 3728 } 3729 3730 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3731 tf->protocol = ATA_PROT_NODATA; 3732 tf->command = ATA_CMD_SET_FEATURES; 3733 tf->feature = SETFEATURES_CDL; 3734 tf->nsect = cdl_action; 3735 3736 return 1; 3737 } 3738 3739 /** 3740 * ata_mselect_control - Simulate MODE SELECT for control page 3741 * @qc: Storage for translated ATA taskfile 3742 * @spg: target sub-page of the control page 3743 * @buf: input buffer 3744 * @len: number of valid bytes in the input buffer 3745 * @fp: out parameter for the failed field on error 3746 * 3747 * Prepare a taskfile to modify caching information for the device. 3748 * 3749 * LOCKING: 3750 * None. 3751 */ 3752 static int ata_mselect_control(struct ata_queued_cmd *qc, u8 spg, 3753 const u8 *buf, int len, u16 *fp) 3754 { 3755 switch (spg) { 3756 case 0: 3757 return ata_mselect_control_spg0(qc, buf, len, fp); 3758 case ATA_FEATURE_SUB_MPAGE: 3759 return ata_mselect_control_ata_feature(qc, buf, len, fp); 3760 default: 3761 return -EINVAL; 3762 } 3763 } 3764 3765 /** 3766 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands 3767 * @qc: Storage for translated ATA taskfile 3768 * 3769 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3770 * Assume this is invoked for direct access devices (e.g. disks) only. 3771 * There should be no block descriptor for other device types. 3772 * 3773 * LOCKING: 3774 * spin_lock_irqsave(host lock) 3775 */ 3776 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3777 { 3778 struct scsi_cmnd *scmd = qc->scsicmd; 3779 const u8 *cdb = scmd->cmnd; 3780 u8 pg, spg; 3781 unsigned six_byte, pg_len, hdr_len, bd_len; 3782 int len, ret; 3783 u16 fp = (u16)-1; 3784 u8 bp = 0xff; 3785 u8 buffer[64]; 3786 const u8 *p = buffer; 3787 3788 six_byte = (cdb[0] == MODE_SELECT); 3789 if (six_byte) { 3790 if (scmd->cmd_len < 5) { 3791 fp = 4; 3792 goto invalid_fld; 3793 } 3794 3795 len = cdb[4]; 3796 hdr_len = 4; 3797 } else { 3798 if (scmd->cmd_len < 9) { 3799 fp = 8; 3800 goto invalid_fld; 3801 } 3802 3803 len = get_unaligned_be16(&cdb[7]); 3804 hdr_len = 8; 3805 } 3806 3807 /* We only support PF=1, SP=0. */ 3808 if ((cdb[1] & 0x11) != 0x10) { 3809 fp = 1; 3810 bp = (cdb[1] & 0x01) ? 1 : 5; 3811 goto invalid_fld; 3812 } 3813 3814 /* Test early for possible overrun. */ 3815 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3816 goto invalid_param_len; 3817 3818 /* Move past header and block descriptors. */ 3819 if (len < hdr_len) 3820 goto invalid_param_len; 3821 3822 if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd), 3823 buffer, sizeof(buffer))) 3824 goto invalid_param_len; 3825 3826 if (six_byte) 3827 bd_len = p[3]; 3828 else 3829 bd_len = get_unaligned_be16(&p[6]); 3830 3831 len -= hdr_len; 3832 p += hdr_len; 3833 if (len < bd_len) 3834 goto invalid_param_len; 3835 if (bd_len != 0 && bd_len != 8) { 3836 fp = (six_byte) ? 3 : 6; 3837 fp += bd_len + hdr_len; 3838 goto invalid_param; 3839 } 3840 3841 len -= bd_len; 3842 p += bd_len; 3843 if (len == 0) 3844 goto skip; 3845 3846 /* Parse both possible formats for the mode page headers. */ 3847 pg = p[0] & 0x3f; 3848 if (p[0] & 0x40) { 3849 if (len < 4) 3850 goto invalid_param_len; 3851 3852 spg = p[1]; 3853 pg_len = get_unaligned_be16(&p[2]); 3854 p += 4; 3855 len -= 4; 3856 } else { 3857 if (len < 2) 3858 goto invalid_param_len; 3859 3860 spg = 0; 3861 pg_len = p[1]; 3862 p += 2; 3863 len -= 2; 3864 } 3865 3866 /* 3867 * Supported subpages: all subpages and ATA feature sub-page f2h of 3868 * the control page. 3869 */ 3870 if (spg) { 3871 switch (spg) { 3872 case ALL_SUB_MPAGES: 3873 /* All subpages is not supported for the control page */ 3874 if (pg == CONTROL_MPAGE) { 3875 fp = (p[0] & 0x40) ? 1 : 0; 3876 fp += hdr_len + bd_len; 3877 goto invalid_param; 3878 } 3879 break; 3880 case ATA_FEATURE_SUB_MPAGE: 3881 if (qc->dev->flags & ATA_DFLAG_CDL && 3882 pg == CONTROL_MPAGE) 3883 break; 3884 fallthrough; 3885 default: 3886 fp = (p[0] & 0x40) ? 1 : 0; 3887 fp += hdr_len + bd_len; 3888 goto invalid_param; 3889 } 3890 } 3891 if (pg_len > len) 3892 goto invalid_param_len; 3893 3894 switch (pg) { 3895 case CACHE_MPAGE: 3896 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) { 3897 fp += hdr_len + bd_len; 3898 goto invalid_param; 3899 } 3900 break; 3901 case CONTROL_MPAGE: 3902 ret = ata_mselect_control(qc, spg, p, pg_len, &fp); 3903 if (ret < 0) { 3904 fp += hdr_len + bd_len; 3905 goto invalid_param; 3906 } 3907 if (!ret) 3908 goto skip; /* No ATA command to send */ 3909 break; 3910 default: 3911 /* Invalid page code */ 3912 fp = bd_len + hdr_len; 3913 goto invalid_param; 3914 } 3915 3916 /* 3917 * Only one page has changeable data, so we only support setting one 3918 * page at a time. 3919 */ 3920 if (len > pg_len) 3921 goto invalid_param; 3922 3923 return 0; 3924 3925 invalid_fld: 3926 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3927 return 1; 3928 3929 invalid_param: 3930 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp); 3931 return 1; 3932 3933 invalid_param_len: 3934 /* "Parameter list length error" */ 3935 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3936 return 1; 3937 3938 skip: 3939 scmd->result = SAM_STAT_GOOD; 3940 return 1; 3941 } 3942 3943 static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma) 3944 { 3945 if (len == 0) 3946 return ATA_CMD_TRUSTED_NONDATA; 3947 else if (send) 3948 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND; 3949 else 3950 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV; 3951 } 3952 3953 static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc) 3954 { 3955 struct scsi_cmnd *scmd = qc->scsicmd; 3956 const u8 *cdb = scmd->cmnd; 3957 struct ata_taskfile *tf = &qc->tf; 3958 u8 secp = cdb[1]; 3959 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT); 3960 u16 spsp = get_unaligned_be16(&cdb[2]); 3961 u32 len = get_unaligned_be32(&cdb[6]); 3962 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO); 3963 3964 /* 3965 * We don't support the ATA "security" protocol. 3966 */ 3967 if (secp == 0xef) { 3968 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0); 3969 return 1; 3970 } 3971 3972 if (cdb[4] & 7) { /* INC_512 */ 3973 if (len > 0xffff) { 3974 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3975 return 1; 3976 } 3977 } else { 3978 if (len > 0x01fffe00) { 3979 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3980 return 1; 3981 } 3982 3983 /* convert to the sector-based ATA addressing */ 3984 len = (len + 511) / 512; 3985 } 3986 3987 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO; 3988 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA; 3989 if (send) 3990 tf->flags |= ATA_TFLAG_WRITE; 3991 tf->command = ata_scsi_trusted_op(len, send, dma); 3992 tf->feature = secp; 3993 tf->lbam = spsp & 0xff; 3994 tf->lbah = spsp >> 8; 3995 3996 if (len) { 3997 tf->nsect = len & 0xff; 3998 tf->lbal = len >> 8; 3999 } else { 4000 if (!send) 4001 tf->lbah = (1 << 7); 4002 } 4003 4004 ata_qc_set_pc_nbytes(qc); 4005 return 0; 4006 } 4007 4008 /** 4009 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler 4010 * @qc: Command to be translated 4011 * 4012 * Translate a SCSI variable length CDB to specified commands. 4013 * It checks a service action value in CDB to call corresponding handler. 4014 * 4015 * RETURNS: 4016 * Zero on success, non-zero on failure 4017 * 4018 */ 4019 static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc) 4020 { 4021 struct scsi_cmnd *scmd = qc->scsicmd; 4022 const u8 *cdb = scmd->cmnd; 4023 const u16 sa = get_unaligned_be16(&cdb[8]); 4024 4025 /* 4026 * if service action represents a ata pass-thru(32) command, 4027 * then pass it to ata_scsi_pass_thru handler. 4028 */ 4029 if (sa == ATA_32) 4030 return ata_scsi_pass_thru(qc); 4031 4032 /* unsupported service action */ 4033 return 1; 4034 } 4035 4036 /** 4037 * ata_get_xlat_func - check if SCSI to ATA translation is possible 4038 * @dev: ATA device 4039 * @cmd: SCSI command opcode to consider 4040 * 4041 * Look up the SCSI command given, and determine whether the 4042 * SCSI command is to be translated or simulated. 4043 * 4044 * RETURNS: 4045 * Pointer to translation function if possible, %NULL if not. 4046 */ 4047 4048 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 4049 { 4050 switch (cmd) { 4051 case READ_6: 4052 case READ_10: 4053 case READ_16: 4054 4055 case WRITE_6: 4056 case WRITE_10: 4057 case WRITE_16: 4058 return ata_scsi_rw_xlat; 4059 4060 case WRITE_SAME_16: 4061 return ata_scsi_write_same_xlat; 4062 4063 case SYNCHRONIZE_CACHE: 4064 case SYNCHRONIZE_CACHE_16: 4065 if (ata_try_flush_cache(dev)) 4066 return ata_scsi_flush_xlat; 4067 break; 4068 4069 case VERIFY: 4070 case VERIFY_16: 4071 return ata_scsi_verify_xlat; 4072 4073 case ATA_12: 4074 case ATA_16: 4075 return ata_scsi_pass_thru; 4076 4077 case VARIABLE_LENGTH_CMD: 4078 return ata_scsi_var_len_cdb_xlat; 4079 4080 case MODE_SELECT: 4081 case MODE_SELECT_10: 4082 return ata_scsi_mode_select_xlat; 4083 4084 case ZBC_IN: 4085 return ata_scsi_zbc_in_xlat; 4086 4087 case ZBC_OUT: 4088 return ata_scsi_zbc_out_xlat; 4089 4090 case SECURITY_PROTOCOL_IN: 4091 case SECURITY_PROTOCOL_OUT: 4092 if (!(dev->flags & ATA_DFLAG_TRUSTED)) 4093 break; 4094 return ata_scsi_security_inout_xlat; 4095 4096 case START_STOP: 4097 return ata_scsi_start_stop_xlat; 4098 } 4099 4100 return NULL; 4101 } 4102 4103 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev) 4104 { 4105 struct ata_port *ap = dev->link->ap; 4106 u8 scsi_op = scmd->cmnd[0]; 4107 ata_xlat_func_t xlat_func; 4108 4109 /* 4110 * scsi_queue_rq() will defer commands if scsi_host_in_recovery(). 4111 * However, this check is done without holding the ap->lock (a libata 4112 * specific lock), so we can have received an error irq since then, 4113 * therefore we must check if EH is pending, while holding ap->lock. 4114 */ 4115 if (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) 4116 return SCSI_MLQUEUE_DEVICE_BUSY; 4117 4118 if (unlikely(!scmd->cmd_len)) 4119 goto bad_cdb_len; 4120 4121 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 4122 if (unlikely(scmd->cmd_len > dev->cdb_len)) 4123 goto bad_cdb_len; 4124 4125 xlat_func = ata_get_xlat_func(dev, scsi_op); 4126 } else if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 4127 /* relay SCSI command to ATAPI device */ 4128 int len = COMMAND_SIZE(scsi_op); 4129 4130 if (unlikely(len > scmd->cmd_len || 4131 len > dev->cdb_len || 4132 scmd->cmd_len > ATAPI_CDB_LEN)) 4133 goto bad_cdb_len; 4134 4135 xlat_func = atapi_xlat; 4136 } else { 4137 /* ATA_16 passthru, treat as an ATA command */ 4138 if (unlikely(scmd->cmd_len > 16)) 4139 goto bad_cdb_len; 4140 4141 xlat_func = ata_get_xlat_func(dev, scsi_op); 4142 } 4143 4144 if (xlat_func) 4145 return ata_scsi_translate(dev, scmd, xlat_func); 4146 4147 ata_scsi_simulate(dev, scmd); 4148 4149 return 0; 4150 4151 bad_cdb_len: 4152 scmd->result = DID_ERROR << 16; 4153 scsi_done(scmd); 4154 return 0; 4155 } 4156 4157 /** 4158 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 4159 * @shost: SCSI host of command to be sent 4160 * @cmd: SCSI command to be sent 4161 * 4162 * In some cases, this function translates SCSI commands into 4163 * ATA taskfiles, and queues the taskfiles to be sent to 4164 * hardware. In other cases, this function simulates a 4165 * SCSI device by evaluating and responding to certain 4166 * SCSI commands. This creates the overall effect of 4167 * ATA and ATAPI devices appearing as SCSI devices. 4168 * 4169 * LOCKING: 4170 * ATA host lock 4171 * 4172 * RETURNS: 4173 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4174 * 0 otherwise. 4175 */ 4176 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 4177 { 4178 struct ata_port *ap; 4179 struct ata_device *dev; 4180 struct scsi_device *scsidev = cmd->device; 4181 int rc = 0; 4182 unsigned long irq_flags; 4183 4184 ap = ata_shost_to_port(shost); 4185 4186 spin_lock_irqsave(ap->lock, irq_flags); 4187 4188 dev = ata_scsi_find_dev(ap, scsidev); 4189 if (likely(dev)) 4190 rc = __ata_scsi_queuecmd(cmd, dev); 4191 else { 4192 cmd->result = (DID_BAD_TARGET << 16); 4193 scsi_done(cmd); 4194 } 4195 4196 spin_unlock_irqrestore(ap->lock, irq_flags); 4197 4198 return rc; 4199 } 4200 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd); 4201 4202 /** 4203 * ata_scsi_simulate - simulate SCSI command on ATA device 4204 * @dev: the target device 4205 * @cmd: SCSI command being sent to device. 4206 * 4207 * Interprets and directly executes a select list of SCSI commands 4208 * that can be handled internally. 4209 * 4210 * LOCKING: 4211 * spin_lock_irqsave(host lock) 4212 */ 4213 4214 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 4215 { 4216 struct ata_scsi_args args; 4217 const u8 *scsicmd = cmd->cmnd; 4218 u8 tmp8; 4219 4220 args.dev = dev; 4221 args.id = dev->id; 4222 args.cmd = cmd; 4223 4224 switch(scsicmd[0]) { 4225 case INQUIRY: 4226 if (scsicmd[1] & 2) /* is CmdDt set? */ 4227 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4228 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 4229 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 4230 else switch (scsicmd[2]) { 4231 case 0x00: 4232 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 4233 break; 4234 case 0x80: 4235 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 4236 break; 4237 case 0x83: 4238 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 4239 break; 4240 case 0x89: 4241 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 4242 break; 4243 case 0xb0: 4244 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 4245 break; 4246 case 0xb1: 4247 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 4248 break; 4249 case 0xb2: 4250 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 4251 break; 4252 case 0xb6: 4253 if (dev->flags & ATA_DFLAG_ZAC) 4254 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6); 4255 else 4256 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4257 break; 4258 case 0xb9: 4259 if (dev->cpr_log) 4260 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b9); 4261 else 4262 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4263 break; 4264 default: 4265 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4266 break; 4267 } 4268 break; 4269 4270 case MODE_SENSE: 4271 case MODE_SENSE_10: 4272 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 4273 break; 4274 4275 case READ_CAPACITY: 4276 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4277 break; 4278 4279 case SERVICE_ACTION_IN_16: 4280 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 4281 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4282 else 4283 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4284 break; 4285 4286 case REPORT_LUNS: 4287 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 4288 break; 4289 4290 case REQUEST_SENSE: 4291 ata_scsi_set_sense(dev, cmd, 0, 0, 0); 4292 break; 4293 4294 /* if we reach this, then writeback caching is disabled, 4295 * turning this into a no-op. 4296 */ 4297 case SYNCHRONIZE_CACHE: 4298 case SYNCHRONIZE_CACHE_16: 4299 fallthrough; 4300 4301 /* no-op's, complete with success */ 4302 case REZERO_UNIT: 4303 case SEEK_6: 4304 case SEEK_10: 4305 case TEST_UNIT_READY: 4306 break; 4307 4308 case SEND_DIAGNOSTIC: 4309 tmp8 = scsicmd[1] & ~(1 << 3); 4310 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4]) 4311 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4312 break; 4313 4314 case MAINTENANCE_IN: 4315 if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES) 4316 ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in); 4317 else 4318 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4319 break; 4320 4321 /* all other commands */ 4322 default: 4323 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0); 4324 /* "Invalid command operation code" */ 4325 break; 4326 } 4327 4328 scsi_done(cmd); 4329 } 4330 4331 int ata_scsi_add_hosts(struct ata_host *host, const struct scsi_host_template *sht) 4332 { 4333 int i, rc; 4334 4335 for (i = 0; i < host->n_ports; i++) { 4336 struct ata_port *ap = host->ports[i]; 4337 struct Scsi_Host *shost; 4338 4339 rc = -ENOMEM; 4340 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 4341 if (!shost) 4342 goto err_alloc; 4343 4344 shost->eh_noresume = 1; 4345 *(struct ata_port **)&shost->hostdata[0] = ap; 4346 ap->scsi_host = shost; 4347 4348 shost->transportt = ata_scsi_transport_template; 4349 shost->unique_id = ap->print_id; 4350 shost->max_id = 16; 4351 shost->max_lun = 1; 4352 shost->max_channel = 1; 4353 shost->max_cmd_len = 32; 4354 4355 /* Schedule policy is determined by ->qc_defer() 4356 * callback and it needs to see every deferred qc. 4357 * Set host_blocked to 1 to prevent SCSI midlayer from 4358 * automatically deferring requests. 4359 */ 4360 shost->max_host_blocked = 1; 4361 4362 rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev); 4363 if (rc) 4364 goto err_alloc; 4365 } 4366 4367 return 0; 4368 4369 err_alloc: 4370 while (--i >= 0) { 4371 struct Scsi_Host *shost = host->ports[i]->scsi_host; 4372 4373 /* scsi_host_put() is in ata_devres_release() */ 4374 scsi_remove_host(shost); 4375 } 4376 return rc; 4377 } 4378 4379 #ifdef CONFIG_OF 4380 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4381 { 4382 struct scsi_device *sdev = dev->sdev; 4383 struct device *d = ap->host->dev; 4384 struct device_node *np = d->of_node; 4385 struct device_node *child; 4386 4387 for_each_available_child_of_node(np, child) { 4388 int ret; 4389 u32 val; 4390 4391 ret = of_property_read_u32(child, "reg", &val); 4392 if (ret) 4393 continue; 4394 if (val == dev->devno) { 4395 dev_dbg(d, "found matching device node\n"); 4396 sdev->sdev_gendev.of_node = child; 4397 return; 4398 } 4399 } 4400 } 4401 #else 4402 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4403 { 4404 } 4405 #endif 4406 4407 void ata_scsi_scan_host(struct ata_port *ap, int sync) 4408 { 4409 int tries = 5; 4410 struct ata_device *last_failed_dev = NULL; 4411 struct ata_link *link; 4412 struct ata_device *dev; 4413 4414 repeat: 4415 ata_for_each_link(link, ap, EDGE) { 4416 ata_for_each_dev(dev, link, ENABLED) { 4417 struct scsi_device *sdev; 4418 int channel = 0, id = 0; 4419 4420 if (dev->sdev) 4421 continue; 4422 4423 if (ata_is_host_link(link)) 4424 id = dev->devno; 4425 else 4426 channel = link->pmp; 4427 4428 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 4429 NULL); 4430 if (!IS_ERR(sdev)) { 4431 dev->sdev = sdev; 4432 ata_scsi_assign_ofnode(dev, ap); 4433 scsi_device_put(sdev); 4434 } else { 4435 dev->sdev = NULL; 4436 } 4437 } 4438 } 4439 4440 /* If we scanned while EH was in progress or allocation 4441 * failure occurred, scan would have failed silently. Check 4442 * whether all devices are attached. 4443 */ 4444 ata_for_each_link(link, ap, EDGE) { 4445 ata_for_each_dev(dev, link, ENABLED) { 4446 if (!dev->sdev) 4447 goto exit_loop; 4448 } 4449 } 4450 exit_loop: 4451 if (!link) 4452 return; 4453 4454 /* we're missing some SCSI devices */ 4455 if (sync) { 4456 /* If caller requested synchrnous scan && we've made 4457 * any progress, sleep briefly and repeat. 4458 */ 4459 if (dev != last_failed_dev) { 4460 msleep(100); 4461 last_failed_dev = dev; 4462 goto repeat; 4463 } 4464 4465 /* We might be failing to detect boot device, give it 4466 * a few more chances. 4467 */ 4468 if (--tries) { 4469 msleep(100); 4470 goto repeat; 4471 } 4472 4473 ata_port_err(ap, 4474 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 4475 } 4476 4477 queue_delayed_work(system_long_wq, &ap->hotplug_task, 4478 round_jiffies_relative(HZ)); 4479 } 4480 4481 /** 4482 * ata_scsi_offline_dev - offline attached SCSI device 4483 * @dev: ATA device to offline attached SCSI device for 4484 * 4485 * This function is called from ata_eh_hotplug() and responsible 4486 * for taking the SCSI device attached to @dev offline. This 4487 * function is called with host lock which protects dev->sdev 4488 * against clearing. 4489 * 4490 * LOCKING: 4491 * spin_lock_irqsave(host lock) 4492 * 4493 * RETURNS: 4494 * 1 if attached SCSI device exists, 0 otherwise. 4495 */ 4496 int ata_scsi_offline_dev(struct ata_device *dev) 4497 { 4498 if (dev->sdev) { 4499 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 4500 return 1; 4501 } 4502 return 0; 4503 } 4504 4505 /** 4506 * ata_scsi_remove_dev - remove attached SCSI device 4507 * @dev: ATA device to remove attached SCSI device for 4508 * 4509 * This function is called from ata_eh_scsi_hotplug() and 4510 * responsible for removing the SCSI device attached to @dev. 4511 * 4512 * LOCKING: 4513 * Kernel thread context (may sleep). 4514 */ 4515 static void ata_scsi_remove_dev(struct ata_device *dev) 4516 { 4517 struct ata_port *ap = dev->link->ap; 4518 struct scsi_device *sdev; 4519 unsigned long flags; 4520 4521 /* Alas, we need to grab scan_mutex to ensure SCSI device 4522 * state doesn't change underneath us and thus 4523 * scsi_device_get() always succeeds. The mutex locking can 4524 * be removed if there is __scsi_device_get() interface which 4525 * increments reference counts regardless of device state. 4526 */ 4527 mutex_lock(&ap->scsi_host->scan_mutex); 4528 spin_lock_irqsave(ap->lock, flags); 4529 4530 /* clearing dev->sdev is protected by host lock */ 4531 sdev = dev->sdev; 4532 dev->sdev = NULL; 4533 4534 if (sdev) { 4535 /* If user initiated unplug races with us, sdev can go 4536 * away underneath us after the host lock and 4537 * scan_mutex are released. Hold onto it. 4538 */ 4539 if (scsi_device_get(sdev) == 0) { 4540 /* The following ensures the attached sdev is 4541 * offline on return from ata_scsi_offline_dev() 4542 * regardless it wins or loses the race 4543 * against this function. 4544 */ 4545 scsi_device_set_state(sdev, SDEV_OFFLINE); 4546 } else { 4547 WARN_ON(1); 4548 sdev = NULL; 4549 } 4550 } 4551 4552 spin_unlock_irqrestore(ap->lock, flags); 4553 mutex_unlock(&ap->scsi_host->scan_mutex); 4554 4555 if (sdev) { 4556 ata_dev_info(dev, "detaching (SCSI %s)\n", 4557 dev_name(&sdev->sdev_gendev)); 4558 4559 scsi_remove_device(sdev); 4560 scsi_device_put(sdev); 4561 } 4562 } 4563 4564 static void ata_scsi_handle_link_detach(struct ata_link *link) 4565 { 4566 struct ata_port *ap = link->ap; 4567 struct ata_device *dev; 4568 4569 ata_for_each_dev(dev, link, ALL) { 4570 unsigned long flags; 4571 4572 if (!(dev->flags & ATA_DFLAG_DETACHED)) 4573 continue; 4574 4575 spin_lock_irqsave(ap->lock, flags); 4576 dev->flags &= ~ATA_DFLAG_DETACHED; 4577 spin_unlock_irqrestore(ap->lock, flags); 4578 4579 if (zpodd_dev_enabled(dev)) 4580 zpodd_exit(dev); 4581 4582 ata_scsi_remove_dev(dev); 4583 } 4584 } 4585 4586 /** 4587 * ata_scsi_media_change_notify - send media change event 4588 * @dev: Pointer to the disk device with media change event 4589 * 4590 * Tell the block layer to send a media change notification 4591 * event. 4592 * 4593 * LOCKING: 4594 * spin_lock_irqsave(host lock) 4595 */ 4596 void ata_scsi_media_change_notify(struct ata_device *dev) 4597 { 4598 if (dev->sdev) 4599 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 4600 GFP_ATOMIC); 4601 } 4602 4603 /** 4604 * ata_scsi_hotplug - SCSI part of hotplug 4605 * @work: Pointer to ATA port to perform SCSI hotplug on 4606 * 4607 * Perform SCSI part of hotplug. It's executed from a separate 4608 * workqueue after EH completes. This is necessary because SCSI 4609 * hot plugging requires working EH and hot unplugging is 4610 * synchronized with hot plugging with a mutex. 4611 * 4612 * LOCKING: 4613 * Kernel thread context (may sleep). 4614 */ 4615 void ata_scsi_hotplug(struct work_struct *work) 4616 { 4617 struct ata_port *ap = 4618 container_of(work, struct ata_port, hotplug_task.work); 4619 int i; 4620 4621 if (ap->pflags & ATA_PFLAG_UNLOADING) 4622 return; 4623 4624 mutex_lock(&ap->scsi_scan_mutex); 4625 4626 /* Unplug detached devices. We cannot use link iterator here 4627 * because PMP links have to be scanned even if PMP is 4628 * currently not attached. Iterate manually. 4629 */ 4630 ata_scsi_handle_link_detach(&ap->link); 4631 if (ap->pmp_link) 4632 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 4633 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 4634 4635 /* scan for new ones */ 4636 ata_scsi_scan_host(ap, 0); 4637 4638 mutex_unlock(&ap->scsi_scan_mutex); 4639 } 4640 4641 /** 4642 * ata_scsi_user_scan - indication for user-initiated bus scan 4643 * @shost: SCSI host to scan 4644 * @channel: Channel to scan 4645 * @id: ID to scan 4646 * @lun: LUN to scan 4647 * 4648 * This function is called when user explicitly requests bus 4649 * scan. Set probe pending flag and invoke EH. 4650 * 4651 * LOCKING: 4652 * SCSI layer (we don't care) 4653 * 4654 * RETURNS: 4655 * Zero. 4656 */ 4657 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 4658 unsigned int id, u64 lun) 4659 { 4660 struct ata_port *ap = ata_shost_to_port(shost); 4661 unsigned long flags; 4662 int devno, rc = 0; 4663 4664 if (lun != SCAN_WILD_CARD && lun) 4665 return -EINVAL; 4666 4667 if (!sata_pmp_attached(ap)) { 4668 if (channel != SCAN_WILD_CARD && channel) 4669 return -EINVAL; 4670 devno = id; 4671 } else { 4672 if (id != SCAN_WILD_CARD && id) 4673 return -EINVAL; 4674 devno = channel; 4675 } 4676 4677 spin_lock_irqsave(ap->lock, flags); 4678 4679 if (devno == SCAN_WILD_CARD) { 4680 struct ata_link *link; 4681 4682 ata_for_each_link(link, ap, EDGE) { 4683 struct ata_eh_info *ehi = &link->eh_info; 4684 ehi->probe_mask |= ATA_ALL_DEVICES; 4685 ehi->action |= ATA_EH_RESET; 4686 } 4687 } else { 4688 struct ata_device *dev = ata_find_dev(ap, devno); 4689 4690 if (dev) { 4691 struct ata_eh_info *ehi = &dev->link->eh_info; 4692 ehi->probe_mask |= 1 << dev->devno; 4693 ehi->action |= ATA_EH_RESET; 4694 } else 4695 rc = -EINVAL; 4696 } 4697 4698 if (rc == 0) { 4699 ata_port_schedule_eh(ap); 4700 spin_unlock_irqrestore(ap->lock, flags); 4701 ata_port_wait_eh(ap); 4702 } else 4703 spin_unlock_irqrestore(ap->lock, flags); 4704 4705 return rc; 4706 } 4707 4708 /** 4709 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4710 * @work: Pointer to ATA port to perform scsi_rescan_device() 4711 * 4712 * After ATA pass thru (SAT) commands are executed successfully, 4713 * libata need to propagate the changes to SCSI layer. 4714 * 4715 * LOCKING: 4716 * Kernel thread context (may sleep). 4717 */ 4718 void ata_scsi_dev_rescan(struct work_struct *work) 4719 { 4720 struct ata_port *ap = 4721 container_of(work, struct ata_port, scsi_rescan_task.work); 4722 struct ata_link *link; 4723 struct ata_device *dev; 4724 unsigned long flags; 4725 bool delay_rescan = false; 4726 4727 mutex_lock(&ap->scsi_scan_mutex); 4728 spin_lock_irqsave(ap->lock, flags); 4729 4730 ata_for_each_link(link, ap, EDGE) { 4731 ata_for_each_dev(dev, link, ENABLED) { 4732 struct scsi_device *sdev = dev->sdev; 4733 4734 if (!sdev) 4735 continue; 4736 if (scsi_device_get(sdev)) 4737 continue; 4738 4739 /* 4740 * If the rescan work was scheduled because of a resume 4741 * event, the port is already fully resumed, but the 4742 * SCSI device may not yet be fully resumed. In such 4743 * case, executing scsi_rescan_device() may cause a 4744 * deadlock with the PM code on device_lock(). Prevent 4745 * this by giving up and retrying rescan after a short 4746 * delay. 4747 */ 4748 delay_rescan = sdev->sdev_gendev.power.is_suspended; 4749 if (delay_rescan) { 4750 scsi_device_put(sdev); 4751 break; 4752 } 4753 4754 spin_unlock_irqrestore(ap->lock, flags); 4755 scsi_rescan_device(sdev); 4756 scsi_device_put(sdev); 4757 spin_lock_irqsave(ap->lock, flags); 4758 } 4759 } 4760 4761 spin_unlock_irqrestore(ap->lock, flags); 4762 mutex_unlock(&ap->scsi_scan_mutex); 4763 4764 if (delay_rescan) 4765 schedule_delayed_work(&ap->scsi_rescan_task, 4766 msecs_to_jiffies(5)); 4767 } 4768