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 /* 1055 * Ask the sd driver to issue START STOP UNIT on runtime suspend 1056 * and resume and shutdown only. For system level suspend/resume, 1057 * devices power state is handled directly by libata EH. 1058 * Given that disks are always spun up on system resume, also 1059 * make sure that the sd driver forces runtime suspended disks 1060 * to be resumed to correctly reflect the power state of the 1061 * device. 1062 */ 1063 sdev->manage_runtime_start_stop = 1; 1064 sdev->manage_shutdown = 1; 1065 sdev->force_runtime_start_on_system_start = 1; 1066 } 1067 1068 /* 1069 * ata_pio_sectors() expects buffer for each sector to not cross 1070 * page boundary. Enforce it by requiring buffers to be sector 1071 * aligned, which works iff sector_size is not larger than 1072 * PAGE_SIZE. ATAPI devices also need the alignment as 1073 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1074 */ 1075 if (sdev->sector_size > PAGE_SIZE) 1076 ata_dev_warn(dev, 1077 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1078 sdev->sector_size); 1079 1080 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1081 1082 if (dev->flags & ATA_DFLAG_AN) 1083 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1084 1085 if (ata_ncq_supported(dev)) 1086 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1087 depth = min(ATA_MAX_QUEUE, depth); 1088 scsi_change_queue_depth(sdev, depth); 1089 1090 if (dev->flags & ATA_DFLAG_TRUSTED) 1091 sdev->security_supported = 1; 1092 1093 dev->sdev = sdev; 1094 return 0; 1095 } 1096 1097 /** 1098 * ata_scsi_slave_alloc - Early setup of SCSI device 1099 * @sdev: SCSI device to examine 1100 * 1101 * This is called from scsi_alloc_sdev() when the scsi device 1102 * associated with an ATA device is scanned on a port. 1103 * 1104 * LOCKING: 1105 * Defined by SCSI layer. We don't really care. 1106 */ 1107 1108 int ata_scsi_slave_alloc(struct scsi_device *sdev) 1109 { 1110 struct ata_port *ap = ata_shost_to_port(sdev->host); 1111 struct device_link *link; 1112 1113 ata_scsi_sdev_config(sdev); 1114 1115 /* 1116 * Create a link from the ata_port device to the scsi device to ensure 1117 * that PM does suspend/resume in the correct order: the scsi device is 1118 * consumer (child) and the ata port the supplier (parent). 1119 */ 1120 link = device_link_add(&sdev->sdev_gendev, &ap->tdev, 1121 DL_FLAG_STATELESS | 1122 DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE); 1123 if (!link) { 1124 ata_port_err(ap, "Failed to create link to scsi device %s\n", 1125 dev_name(&sdev->sdev_gendev)); 1126 return -ENODEV; 1127 } 1128 1129 return 0; 1130 } 1131 EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc); 1132 1133 /** 1134 * ata_scsi_slave_config - Set SCSI device attributes 1135 * @sdev: SCSI device to examine 1136 * 1137 * This is called before we actually start reading 1138 * and writing to the device, to configure certain 1139 * SCSI mid-layer behaviors. 1140 * 1141 * LOCKING: 1142 * Defined by SCSI layer. We don't really care. 1143 */ 1144 1145 int ata_scsi_slave_config(struct scsi_device *sdev) 1146 { 1147 struct ata_port *ap = ata_shost_to_port(sdev->host); 1148 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1149 1150 if (dev) 1151 return ata_scsi_dev_config(sdev, dev); 1152 1153 return 0; 1154 } 1155 EXPORT_SYMBOL_GPL(ata_scsi_slave_config); 1156 1157 /** 1158 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1159 * @sdev: SCSI device to be destroyed 1160 * 1161 * @sdev is about to be destroyed for hot/warm unplugging. If 1162 * this unplugging was initiated by libata as indicated by NULL 1163 * dev->sdev, this function doesn't have to do anything. 1164 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1165 * Clear dev->sdev, schedule the device for ATA detach and invoke 1166 * EH. 1167 * 1168 * LOCKING: 1169 * Defined by SCSI layer. We don't really care. 1170 */ 1171 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1172 { 1173 struct ata_port *ap = ata_shost_to_port(sdev->host); 1174 unsigned long flags; 1175 struct ata_device *dev; 1176 1177 device_link_remove(&sdev->sdev_gendev, &ap->tdev); 1178 1179 spin_lock_irqsave(ap->lock, flags); 1180 dev = __ata_scsi_find_dev(ap, sdev); 1181 if (dev && dev->sdev) { 1182 /* SCSI device already in CANCEL state, no need to offline it */ 1183 dev->sdev = NULL; 1184 dev->flags |= ATA_DFLAG_DETACH; 1185 ata_port_schedule_eh(ap); 1186 } 1187 spin_unlock_irqrestore(ap->lock, flags); 1188 1189 kfree(sdev->dma_drain_buf); 1190 } 1191 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy); 1192 1193 /** 1194 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1195 * @qc: Storage for translated ATA taskfile 1196 * 1197 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1198 * (to start). Perhaps these commands should be preceded by 1199 * CHECK POWER MODE to see what power mode the device is already in. 1200 * [See SAT revision 5 at www.t10.org] 1201 * 1202 * LOCKING: 1203 * spin_lock_irqsave(host lock) 1204 * 1205 * RETURNS: 1206 * Zero on success, non-zero on error. 1207 */ 1208 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1209 { 1210 struct scsi_cmnd *scmd = qc->scsicmd; 1211 const u8 *cdb = scmd->cmnd; 1212 u16 fp; 1213 u8 bp = 0xff; 1214 1215 if (scmd->cmd_len < 5) { 1216 fp = 4; 1217 goto invalid_fld; 1218 } 1219 1220 /* LOEJ bit set not supported */ 1221 if (cdb[4] & 0x2) { 1222 fp = 4; 1223 bp = 1; 1224 goto invalid_fld; 1225 } 1226 1227 /* Power conditions not supported */ 1228 if (((cdb[4] >> 4) & 0xf) != 0) { 1229 fp = 4; 1230 bp = 3; 1231 goto invalid_fld; 1232 } 1233 1234 /* Ignore IMMED bit (cdb[1] & 0x1), violates sat-r05 */ 1235 if (!ata_dev_power_init_tf(qc->dev, &qc->tf, cdb[4] & 0x1)) { 1236 ata_scsi_set_sense(qc->dev, scmd, ABORTED_COMMAND, 0, 0); 1237 return 1; 1238 } 1239 1240 /* 1241 * Standby and Idle condition timers could be implemented but that 1242 * would require libata to implement the Power condition mode page 1243 * and allow the user to change it. Changing mode pages requires 1244 * MODE SELECT to be implemented. 1245 */ 1246 1247 return 0; 1248 1249 invalid_fld: 1250 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 1251 return 1; 1252 } 1253 1254 /** 1255 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1256 * @qc: Storage for translated ATA taskfile 1257 * 1258 * Sets up an ATA taskfile to issue FLUSH CACHE or 1259 * FLUSH CACHE EXT. 1260 * 1261 * LOCKING: 1262 * spin_lock_irqsave(host lock) 1263 * 1264 * RETURNS: 1265 * Zero on success, non-zero on error. 1266 */ 1267 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1268 { 1269 struct ata_taskfile *tf = &qc->tf; 1270 1271 tf->flags |= ATA_TFLAG_DEVICE; 1272 tf->protocol = ATA_PROT_NODATA; 1273 1274 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1275 tf->command = ATA_CMD_FLUSH_EXT; 1276 else 1277 tf->command = ATA_CMD_FLUSH; 1278 1279 /* flush is critical for IO integrity, consider it an IO command */ 1280 qc->flags |= ATA_QCFLAG_IO; 1281 1282 return 0; 1283 } 1284 1285 /** 1286 * scsi_6_lba_len - Get LBA and transfer length 1287 * @cdb: SCSI command to translate 1288 * 1289 * Calculate LBA and transfer length for 6-byte commands. 1290 * 1291 * RETURNS: 1292 * @plba: the LBA 1293 * @plen: the transfer length 1294 */ 1295 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1296 { 1297 u64 lba = 0; 1298 u32 len; 1299 1300 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1301 lba |= ((u64)cdb[2]) << 8; 1302 lba |= ((u64)cdb[3]); 1303 1304 len = cdb[4]; 1305 1306 *plba = lba; 1307 *plen = len; 1308 } 1309 1310 /** 1311 * scsi_10_lba_len - Get LBA and transfer length 1312 * @cdb: SCSI command to translate 1313 * 1314 * Calculate LBA and transfer length for 10-byte commands. 1315 * 1316 * RETURNS: 1317 * @plba: the LBA 1318 * @plen: the transfer length 1319 */ 1320 static inline void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1321 { 1322 *plba = get_unaligned_be32(&cdb[2]); 1323 *plen = get_unaligned_be16(&cdb[7]); 1324 } 1325 1326 /** 1327 * scsi_16_lba_len - Get LBA and transfer length 1328 * @cdb: SCSI command to translate 1329 * 1330 * Calculate LBA and transfer length for 16-byte commands. 1331 * 1332 * RETURNS: 1333 * @plba: the LBA 1334 * @plen: the transfer length 1335 */ 1336 static inline void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1337 { 1338 *plba = get_unaligned_be64(&cdb[2]); 1339 *plen = get_unaligned_be32(&cdb[10]); 1340 } 1341 1342 /** 1343 * scsi_dld - Get duration limit descriptor index 1344 * @cdb: SCSI command to translate 1345 * 1346 * Returns the dld bits indicating the index of a command duration limit 1347 * descriptor. 1348 */ 1349 static inline int scsi_dld(const u8 *cdb) 1350 { 1351 return ((cdb[1] & 0x01) << 2) | ((cdb[14] >> 6) & 0x03); 1352 } 1353 1354 /** 1355 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1356 * @qc: Storage for translated ATA taskfile 1357 * 1358 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1359 * 1360 * LOCKING: 1361 * spin_lock_irqsave(host lock) 1362 * 1363 * RETURNS: 1364 * Zero on success, non-zero on error. 1365 */ 1366 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1367 { 1368 struct scsi_cmnd *scmd = qc->scsicmd; 1369 struct ata_taskfile *tf = &qc->tf; 1370 struct ata_device *dev = qc->dev; 1371 u64 dev_sectors = qc->dev->n_sectors; 1372 const u8 *cdb = scmd->cmnd; 1373 u64 block; 1374 u32 n_block; 1375 u16 fp; 1376 1377 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1378 tf->protocol = ATA_PROT_NODATA; 1379 1380 switch (cdb[0]) { 1381 case VERIFY: 1382 if (scmd->cmd_len < 10) { 1383 fp = 9; 1384 goto invalid_fld; 1385 } 1386 scsi_10_lba_len(cdb, &block, &n_block); 1387 break; 1388 case VERIFY_16: 1389 if (scmd->cmd_len < 16) { 1390 fp = 15; 1391 goto invalid_fld; 1392 } 1393 scsi_16_lba_len(cdb, &block, &n_block); 1394 break; 1395 default: 1396 fp = 0; 1397 goto invalid_fld; 1398 } 1399 1400 if (!n_block) 1401 goto nothing_to_do; 1402 if (block >= dev_sectors) 1403 goto out_of_range; 1404 if ((block + n_block) > dev_sectors) 1405 goto out_of_range; 1406 1407 if (dev->flags & ATA_DFLAG_LBA) { 1408 tf->flags |= ATA_TFLAG_LBA; 1409 1410 if (lba_28_ok(block, n_block)) { 1411 /* use LBA28 */ 1412 tf->command = ATA_CMD_VERIFY; 1413 tf->device |= (block >> 24) & 0xf; 1414 } else if (lba_48_ok(block, n_block)) { 1415 if (!(dev->flags & ATA_DFLAG_LBA48)) 1416 goto out_of_range; 1417 1418 /* use LBA48 */ 1419 tf->flags |= ATA_TFLAG_LBA48; 1420 tf->command = ATA_CMD_VERIFY_EXT; 1421 1422 tf->hob_nsect = (n_block >> 8) & 0xff; 1423 1424 tf->hob_lbah = (block >> 40) & 0xff; 1425 tf->hob_lbam = (block >> 32) & 0xff; 1426 tf->hob_lbal = (block >> 24) & 0xff; 1427 } else 1428 /* request too large even for LBA48 */ 1429 goto out_of_range; 1430 1431 tf->nsect = n_block & 0xff; 1432 1433 tf->lbah = (block >> 16) & 0xff; 1434 tf->lbam = (block >> 8) & 0xff; 1435 tf->lbal = block & 0xff; 1436 1437 tf->device |= ATA_LBA; 1438 } else { 1439 /* CHS */ 1440 u32 sect, head, cyl, track; 1441 1442 if (!lba_28_ok(block, n_block)) 1443 goto out_of_range; 1444 1445 /* Convert LBA to CHS */ 1446 track = (u32)block / dev->sectors; 1447 cyl = track / dev->heads; 1448 head = track % dev->heads; 1449 sect = (u32)block % dev->sectors + 1; 1450 1451 /* Check whether the converted CHS can fit. 1452 Cylinder: 0-65535 1453 Head: 0-15 1454 Sector: 1-255*/ 1455 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1456 goto out_of_range; 1457 1458 tf->command = ATA_CMD_VERIFY; 1459 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1460 tf->lbal = sect; 1461 tf->lbam = cyl; 1462 tf->lbah = cyl >> 8; 1463 tf->device |= head; 1464 } 1465 1466 return 0; 1467 1468 invalid_fld: 1469 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1470 return 1; 1471 1472 out_of_range: 1473 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1474 /* "Logical Block Address out of range" */ 1475 return 1; 1476 1477 nothing_to_do: 1478 scmd->result = SAM_STAT_GOOD; 1479 return 1; 1480 } 1481 1482 static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks) 1483 { 1484 struct request *rq = scsi_cmd_to_rq(scmd); 1485 u32 req_blocks; 1486 1487 if (!blk_rq_is_passthrough(rq)) 1488 return true; 1489 1490 req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size; 1491 if (n_blocks > req_blocks) 1492 return false; 1493 1494 return true; 1495 } 1496 1497 /** 1498 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1499 * @qc: Storage for translated ATA taskfile 1500 * 1501 * Converts any of six SCSI read/write commands into the 1502 * ATA counterpart, including starting sector (LBA), 1503 * sector count, and taking into account the device's LBA48 1504 * support. 1505 * 1506 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1507 * %WRITE_16 are currently supported. 1508 * 1509 * LOCKING: 1510 * spin_lock_irqsave(host lock) 1511 * 1512 * RETURNS: 1513 * Zero on success, non-zero on error. 1514 */ 1515 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1516 { 1517 struct scsi_cmnd *scmd = qc->scsicmd; 1518 const u8 *cdb = scmd->cmnd; 1519 struct request *rq = scsi_cmd_to_rq(scmd); 1520 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq)); 1521 unsigned int tf_flags = 0; 1522 int dld = 0; 1523 u64 block; 1524 u32 n_block; 1525 int rc; 1526 u16 fp = 0; 1527 1528 switch (cdb[0]) { 1529 case WRITE_6: 1530 case WRITE_10: 1531 case WRITE_16: 1532 tf_flags |= ATA_TFLAG_WRITE; 1533 break; 1534 } 1535 1536 /* Calculate the SCSI LBA, transfer length and FUA. */ 1537 switch (cdb[0]) { 1538 case READ_10: 1539 case WRITE_10: 1540 if (unlikely(scmd->cmd_len < 10)) { 1541 fp = 9; 1542 goto invalid_fld; 1543 } 1544 scsi_10_lba_len(cdb, &block, &n_block); 1545 if (cdb[1] & (1 << 3)) 1546 tf_flags |= ATA_TFLAG_FUA; 1547 if (!ata_check_nblocks(scmd, n_block)) 1548 goto invalid_fld; 1549 break; 1550 case READ_6: 1551 case WRITE_6: 1552 if (unlikely(scmd->cmd_len < 6)) { 1553 fp = 5; 1554 goto invalid_fld; 1555 } 1556 scsi_6_lba_len(cdb, &block, &n_block); 1557 1558 /* for 6-byte r/w commands, transfer length 0 1559 * means 256 blocks of data, not 0 block. 1560 */ 1561 if (!n_block) 1562 n_block = 256; 1563 if (!ata_check_nblocks(scmd, n_block)) 1564 goto invalid_fld; 1565 break; 1566 case READ_16: 1567 case WRITE_16: 1568 if (unlikely(scmd->cmd_len < 16)) { 1569 fp = 15; 1570 goto invalid_fld; 1571 } 1572 scsi_16_lba_len(cdb, &block, &n_block); 1573 dld = scsi_dld(cdb); 1574 if (cdb[1] & (1 << 3)) 1575 tf_flags |= ATA_TFLAG_FUA; 1576 if (!ata_check_nblocks(scmd, n_block)) 1577 goto invalid_fld; 1578 break; 1579 default: 1580 fp = 0; 1581 goto invalid_fld; 1582 } 1583 1584 /* Check and compose ATA command */ 1585 if (!n_block) 1586 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1587 * length 0 means transfer 0 block of data. 1588 * However, for ATA R/W commands, sector count 0 means 1589 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1590 * 1591 * WARNING: one or two older ATA drives treat 0 as 0... 1592 */ 1593 goto nothing_to_do; 1594 1595 qc->flags |= ATA_QCFLAG_IO; 1596 qc->nbytes = n_block * scmd->device->sector_size; 1597 1598 rc = ata_build_rw_tf(qc, block, n_block, tf_flags, dld, class); 1599 if (likely(rc == 0)) 1600 return 0; 1601 1602 if (rc == -ERANGE) 1603 goto out_of_range; 1604 /* treat all other errors as -EINVAL, fall through */ 1605 invalid_fld: 1606 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1607 return 1; 1608 1609 out_of_range: 1610 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1611 /* "Logical Block Address out of range" */ 1612 return 1; 1613 1614 nothing_to_do: 1615 scmd->result = SAM_STAT_GOOD; 1616 return 1; 1617 } 1618 1619 static void ata_qc_done(struct ata_queued_cmd *qc) 1620 { 1621 struct scsi_cmnd *cmd = qc->scsicmd; 1622 void (*done)(struct scsi_cmnd *) = qc->scsidone; 1623 1624 ata_qc_free(qc); 1625 done(cmd); 1626 } 1627 1628 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1629 { 1630 struct scsi_cmnd *cmd = qc->scsicmd; 1631 u8 *cdb = cmd->cmnd; 1632 int need_sense = (qc->err_mask != 0) && 1633 !(qc->flags & ATA_QCFLAG_SENSE_VALID); 1634 1635 /* For ATA pass thru (SAT) commands, generate a sense block if 1636 * user mandated it or if there's an error. Note that if we 1637 * generate because the user forced us to [CK_COND =1], a check 1638 * condition is generated and the ATA register values are returned 1639 * whether the command completed successfully or not. If there 1640 * was no error, we use the following sense data: 1641 * sk = RECOVERED ERROR 1642 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1643 */ 1644 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1645 ((cdb[2] & 0x20) || need_sense)) 1646 ata_gen_passthru_sense(qc); 1647 else if (need_sense) 1648 ata_gen_ata_sense(qc); 1649 else 1650 /* Keep the SCSI ML and status byte, clear host byte. */ 1651 cmd->result &= 0x0000ffff; 1652 1653 ata_qc_done(qc); 1654 } 1655 1656 /** 1657 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1658 * @dev: ATA device to which the command is addressed 1659 * @cmd: SCSI command to execute 1660 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1661 * 1662 * Our ->queuecommand() function has decided that the SCSI 1663 * command issued can be directly translated into an ATA 1664 * command, rather than handled internally. 1665 * 1666 * This function sets up an ata_queued_cmd structure for the 1667 * SCSI command, and sends that ata_queued_cmd to the hardware. 1668 * 1669 * The xlat_func argument (actor) returns 0 if ready to execute 1670 * ATA command, else 1 to finish translation. If 1 is returned 1671 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1672 * to be set reflecting an error condition or clean (early) 1673 * termination. 1674 * 1675 * LOCKING: 1676 * spin_lock_irqsave(host lock) 1677 * 1678 * RETURNS: 1679 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1680 * needs to be deferred. 1681 */ 1682 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1683 ata_xlat_func_t xlat_func) 1684 { 1685 struct ata_port *ap = dev->link->ap; 1686 struct ata_queued_cmd *qc; 1687 int rc; 1688 1689 qc = ata_scsi_qc_new(dev, cmd); 1690 if (!qc) 1691 goto err_mem; 1692 1693 /* data is present; dma-map it */ 1694 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1695 cmd->sc_data_direction == DMA_TO_DEVICE) { 1696 if (unlikely(scsi_bufflen(cmd) < 1)) { 1697 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1698 goto err_did; 1699 } 1700 1701 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1702 1703 qc->dma_dir = cmd->sc_data_direction; 1704 } 1705 1706 qc->complete_fn = ata_scsi_qc_complete; 1707 1708 if (xlat_func(qc)) 1709 goto early_finish; 1710 1711 if (ap->ops->qc_defer) { 1712 if ((rc = ap->ops->qc_defer(qc))) 1713 goto defer; 1714 } 1715 1716 /* select device, send command to hardware */ 1717 ata_qc_issue(qc); 1718 1719 return 0; 1720 1721 early_finish: 1722 ata_qc_free(qc); 1723 scsi_done(cmd); 1724 return 0; 1725 1726 err_did: 1727 ata_qc_free(qc); 1728 cmd->result = (DID_ERROR << 16); 1729 scsi_done(cmd); 1730 err_mem: 1731 return 0; 1732 1733 defer: 1734 ata_qc_free(qc); 1735 if (rc == ATA_DEFER_LINK) 1736 return SCSI_MLQUEUE_DEVICE_BUSY; 1737 else 1738 return SCSI_MLQUEUE_HOST_BUSY; 1739 } 1740 1741 struct ata_scsi_args { 1742 struct ata_device *dev; 1743 u16 *id; 1744 struct scsi_cmnd *cmd; 1745 }; 1746 1747 /** 1748 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1749 * @args: device IDENTIFY data / SCSI command of interest. 1750 * @actor: Callback hook for desired SCSI command simulator 1751 * 1752 * Takes care of the hard work of simulating a SCSI command... 1753 * Mapping the response buffer, calling the command's handler, 1754 * and handling the handler's return value. This return value 1755 * indicates whether the handler wishes the SCSI command to be 1756 * completed successfully (0), or not (in which case cmd->result 1757 * and sense buffer are assumed to be set). 1758 * 1759 * LOCKING: 1760 * spin_lock_irqsave(host lock) 1761 */ 1762 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1763 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1764 { 1765 unsigned int rc; 1766 struct scsi_cmnd *cmd = args->cmd; 1767 unsigned long flags; 1768 1769 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 1770 1771 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1772 rc = actor(args, ata_scsi_rbuf); 1773 if (rc == 0) 1774 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1775 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1776 1777 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 1778 1779 if (rc == 0) 1780 cmd->result = SAM_STAT_GOOD; 1781 } 1782 1783 /** 1784 * ata_scsiop_inq_std - Simulate INQUIRY command 1785 * @args: device IDENTIFY data / SCSI command of interest. 1786 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1787 * 1788 * Returns standard device identification data associated 1789 * with non-VPD INQUIRY command output. 1790 * 1791 * LOCKING: 1792 * spin_lock_irqsave(host lock) 1793 */ 1794 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1795 { 1796 static const u8 versions[] = { 1797 0x00, 1798 0x60, /* SAM-3 (no version claimed) */ 1799 1800 0x03, 1801 0x20, /* SBC-2 (no version claimed) */ 1802 1803 0x03, 1804 0x00 /* SPC-3 (no version claimed) */ 1805 }; 1806 static const u8 versions_zbc[] = { 1807 0x00, 1808 0xA0, /* SAM-5 (no version claimed) */ 1809 1810 0x06, 1811 0x00, /* SBC-4 (no version claimed) */ 1812 1813 0x05, 1814 0xC0, /* SPC-5 (no version claimed) */ 1815 1816 0x60, 1817 0x24, /* ZBC r05 */ 1818 }; 1819 1820 u8 hdr[] = { 1821 TYPE_DISK, 1822 0, 1823 0x5, /* claim SPC-3 version compatibility */ 1824 2, 1825 95 - 4, 1826 0, 1827 0, 1828 2 1829 }; 1830 1831 /* set scsi removable (RMB) bit per ata bit, or if the 1832 * AHCI port says it's external (Hotplug-capable, eSATA). 1833 */ 1834 if (ata_id_removable(args->id) || 1835 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) 1836 hdr[1] |= (1 << 7); 1837 1838 if (args->dev->class == ATA_DEV_ZAC) { 1839 hdr[0] = TYPE_ZBC; 1840 hdr[2] = 0x7; /* claim SPC-5 version compatibility */ 1841 } 1842 1843 if (args->dev->flags & ATA_DFLAG_CDL) 1844 hdr[2] = 0xd; /* claim SPC-6 version compatibility */ 1845 1846 memcpy(rbuf, hdr, sizeof(hdr)); 1847 memcpy(&rbuf[8], "ATA ", 8); 1848 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1849 1850 /* From SAT, use last 2 words from fw rev unless they are spaces */ 1851 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 1852 if (strncmp(&rbuf[32], " ", 4) == 0) 1853 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1854 1855 if (rbuf[32] == 0 || rbuf[32] == ' ') 1856 memcpy(&rbuf[32], "n/a ", 4); 1857 1858 if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC) 1859 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 1860 else 1861 memcpy(rbuf + 58, versions, sizeof(versions)); 1862 1863 return 0; 1864 } 1865 1866 /** 1867 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1868 * @args: device IDENTIFY data / SCSI command of interest. 1869 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1870 * 1871 * Returns list of inquiry VPD pages available. 1872 * 1873 * LOCKING: 1874 * spin_lock_irqsave(host lock) 1875 */ 1876 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1877 { 1878 int i, num_pages = 0; 1879 static const u8 pages[] = { 1880 0x00, /* page 0x00, this page */ 1881 0x80, /* page 0x80, unit serial no page */ 1882 0x83, /* page 0x83, device ident page */ 1883 0x89, /* page 0x89, ata info page */ 1884 0xb0, /* page 0xb0, block limits page */ 1885 0xb1, /* page 0xb1, block device characteristics page */ 1886 0xb2, /* page 0xb2, thin provisioning page */ 1887 0xb6, /* page 0xb6, zoned block device characteristics */ 1888 0xb9, /* page 0xb9, concurrent positioning ranges */ 1889 }; 1890 1891 for (i = 0; i < sizeof(pages); i++) { 1892 if (pages[i] == 0xb6 && 1893 !(args->dev->flags & ATA_DFLAG_ZAC)) 1894 continue; 1895 rbuf[num_pages + 4] = pages[i]; 1896 num_pages++; 1897 } 1898 rbuf[3] = num_pages; /* number of supported VPD pages */ 1899 return 0; 1900 } 1901 1902 /** 1903 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1904 * @args: device IDENTIFY data / SCSI command of interest. 1905 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1906 * 1907 * Returns ATA device serial number. 1908 * 1909 * LOCKING: 1910 * spin_lock_irqsave(host lock) 1911 */ 1912 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1913 { 1914 static const u8 hdr[] = { 1915 0, 1916 0x80, /* this page code */ 1917 0, 1918 ATA_ID_SERNO_LEN, /* page len */ 1919 }; 1920 1921 memcpy(rbuf, hdr, sizeof(hdr)); 1922 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1923 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1924 return 0; 1925 } 1926 1927 /** 1928 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1929 * @args: device IDENTIFY data / SCSI command of interest. 1930 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1931 * 1932 * Yields two logical unit device identification designators: 1933 * - vendor specific ASCII containing the ATA serial number 1934 * - SAT defined "t10 vendor id based" containing ASCII vendor 1935 * name ("ATA "), model and serial numbers. 1936 * 1937 * LOCKING: 1938 * spin_lock_irqsave(host lock) 1939 */ 1940 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 1941 { 1942 const int sat_model_serial_desc_len = 68; 1943 int num; 1944 1945 rbuf[1] = 0x83; /* this page code */ 1946 num = 4; 1947 1948 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1949 rbuf[num + 0] = 2; 1950 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1951 num += 4; 1952 ata_id_string(args->id, (unsigned char *) rbuf + num, 1953 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1954 num += ATA_ID_SERNO_LEN; 1955 1956 /* SAT defined lu model and serial numbers descriptor */ 1957 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1958 rbuf[num + 0] = 2; 1959 rbuf[num + 1] = 1; 1960 rbuf[num + 3] = sat_model_serial_desc_len; 1961 num += 4; 1962 memcpy(rbuf + num, "ATA ", 8); 1963 num += 8; 1964 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 1965 ATA_ID_PROD_LEN); 1966 num += ATA_ID_PROD_LEN; 1967 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 1968 ATA_ID_SERNO_LEN); 1969 num += ATA_ID_SERNO_LEN; 1970 1971 if (ata_id_has_wwn(args->id)) { 1972 /* SAT defined lu world wide name */ 1973 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 1974 rbuf[num + 0] = 1; 1975 rbuf[num + 1] = 3; 1976 rbuf[num + 3] = ATA_ID_WWN_LEN; 1977 num += 4; 1978 ata_id_string(args->id, (unsigned char *) rbuf + num, 1979 ATA_ID_WWN, ATA_ID_WWN_LEN); 1980 num += ATA_ID_WWN_LEN; 1981 } 1982 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 1983 return 0; 1984 } 1985 1986 /** 1987 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 1988 * @args: device IDENTIFY data / SCSI command of interest. 1989 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1990 * 1991 * Yields SAT-specified ATA VPD page. 1992 * 1993 * LOCKING: 1994 * spin_lock_irqsave(host lock) 1995 */ 1996 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 1997 { 1998 rbuf[1] = 0x89; /* our page code */ 1999 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2000 rbuf[3] = (0x238 & 0xff); 2001 2002 memcpy(&rbuf[8], "linux ", 8); 2003 memcpy(&rbuf[16], "libata ", 16); 2004 memcpy(&rbuf[32], DRV_VERSION, 4); 2005 2006 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2007 rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */ 2008 /* TODO: PMP? */ 2009 2010 /* we don't store the ATA device signature, so we fake it */ 2011 rbuf[38] = ATA_DRDY; /* really, this is Status reg */ 2012 rbuf[40] = 0x1; 2013 rbuf[48] = 0x1; 2014 2015 rbuf[56] = ATA_CMD_ID_ATA; 2016 2017 memcpy(&rbuf[60], &args->id[0], 512); 2018 return 0; 2019 } 2020 2021 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2022 { 2023 struct ata_device *dev = args->dev; 2024 u16 min_io_sectors; 2025 2026 rbuf[1] = 0xb0; 2027 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2028 2029 /* 2030 * Optimal transfer length granularity. 2031 * 2032 * This is always one physical block, but for disks with a smaller 2033 * logical than physical sector size we need to figure out what the 2034 * latter is. 2035 */ 2036 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2037 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2038 2039 /* 2040 * Optimal unmap granularity. 2041 * 2042 * The ATA spec doesn't even know about a granularity or alignment 2043 * for the TRIM command. We can leave away most of the unmap related 2044 * VPD page entries, but we have specifify a granularity to signal 2045 * that we support some form of unmap - in thise case via WRITE SAME 2046 * with the unmap bit set. 2047 */ 2048 if (ata_id_has_trim(args->id)) { 2049 u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM; 2050 2051 if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M) 2052 max_blocks = 128 << (20 - SECTOR_SHIFT); 2053 2054 put_unaligned_be64(max_blocks, &rbuf[36]); 2055 put_unaligned_be32(1, &rbuf[28]); 2056 } 2057 2058 return 0; 2059 } 2060 2061 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2062 { 2063 int form_factor = ata_id_form_factor(args->id); 2064 int media_rotation_rate = ata_id_rotation_rate(args->id); 2065 u8 zoned = ata_id_zoned_cap(args->id); 2066 2067 rbuf[1] = 0xb1; 2068 rbuf[3] = 0x3c; 2069 rbuf[4] = media_rotation_rate >> 8; 2070 rbuf[5] = media_rotation_rate; 2071 rbuf[7] = form_factor; 2072 if (zoned) 2073 rbuf[8] = (zoned << 4); 2074 2075 return 0; 2076 } 2077 2078 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2079 { 2080 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2081 rbuf[1] = 0xb2; 2082 rbuf[3] = 0x4; 2083 rbuf[5] = 1 << 6; /* TPWS */ 2084 2085 return 0; 2086 } 2087 2088 static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) 2089 { 2090 /* 2091 * zbc-r05 SCSI Zoned Block device characteristics VPD page 2092 */ 2093 rbuf[1] = 0xb6; 2094 rbuf[3] = 0x3C; 2095 2096 /* 2097 * URSWRZ bit is only meaningful for host-managed ZAC drives 2098 */ 2099 if (args->dev->zac_zoned_cap & 1) 2100 rbuf[4] |= 1; 2101 put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]); 2102 put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]); 2103 put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]); 2104 2105 return 0; 2106 } 2107 2108 static unsigned int ata_scsiop_inq_b9(struct ata_scsi_args *args, u8 *rbuf) 2109 { 2110 struct ata_cpr_log *cpr_log = args->dev->cpr_log; 2111 u8 *desc = &rbuf[64]; 2112 int i; 2113 2114 /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */ 2115 rbuf[1] = 0xb9; 2116 put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]); 2117 2118 for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) { 2119 desc[0] = cpr_log->cpr[i].num; 2120 desc[1] = cpr_log->cpr[i].num_storage_elements; 2121 put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]); 2122 put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[16]); 2123 } 2124 2125 return 0; 2126 } 2127 2128 /** 2129 * modecpy - Prepare response for MODE SENSE 2130 * @dest: output buffer 2131 * @src: data being copied 2132 * @n: length of mode page 2133 * @changeable: whether changeable parameters are requested 2134 * 2135 * Generate a generic MODE SENSE page for either current or changeable 2136 * parameters. 2137 * 2138 * LOCKING: 2139 * None. 2140 */ 2141 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2142 { 2143 if (changeable) { 2144 memcpy(dest, src, 2); 2145 memset(dest + 2, 0, n - 2); 2146 } else { 2147 memcpy(dest, src, n); 2148 } 2149 } 2150 2151 /** 2152 * ata_msense_caching - Simulate MODE SENSE caching info page 2153 * @id: device IDENTIFY data 2154 * @buf: output buffer 2155 * @changeable: whether changeable parameters are requested 2156 * 2157 * Generate a caching info page, which conditionally indicates 2158 * write caching to the SCSI layer, depending on device 2159 * capabilities. 2160 * 2161 * LOCKING: 2162 * None. 2163 */ 2164 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2165 { 2166 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2167 if (changeable) { 2168 buf[2] |= (1 << 2); /* ata_mselect_caching() */ 2169 } else { 2170 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */ 2171 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */ 2172 } 2173 return sizeof(def_cache_mpage); 2174 } 2175 2176 /* 2177 * Simulate MODE SENSE control mode page, sub-page 0. 2178 */ 2179 static unsigned int ata_msense_control_spg0(struct ata_device *dev, u8 *buf, 2180 bool changeable) 2181 { 2182 modecpy(buf, def_control_mpage, 2183 sizeof(def_control_mpage), changeable); 2184 if (changeable) { 2185 /* ata_mselect_control() */ 2186 buf[2] |= (1 << 2); 2187 } else { 2188 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 2189 2190 /* descriptor format sense data */ 2191 buf[2] |= (d_sense << 2); 2192 } 2193 2194 return sizeof(def_control_mpage); 2195 } 2196 2197 /* 2198 * Translate an ATA duration limit in microseconds to a SCSI duration limit 2199 * using the t2cdlunits 0xa (10ms). Since the SCSI duration limits are 2-bytes 2200 * only, take care of overflows. 2201 */ 2202 static inline u16 ata_xlat_cdl_limit(u8 *buf) 2203 { 2204 u32 limit = get_unaligned_le32(buf); 2205 2206 return min_t(u32, limit / 10000, 65535); 2207 } 2208 2209 /* 2210 * Simulate MODE SENSE control mode page, sub-pages 07h and 08h 2211 * (command duration limits T2A and T2B mode pages). 2212 */ 2213 static unsigned int ata_msense_control_spgt2(struct ata_device *dev, u8 *buf, 2214 u8 spg) 2215 { 2216 u8 *b, *cdl = dev->cdl, *desc; 2217 u32 policy; 2218 int i; 2219 2220 /* 2221 * Fill the subpage. The first four bytes of the T2A/T2B mode pages 2222 * are a header. The PAGE LENGTH field is the size of the page 2223 * excluding the header. 2224 */ 2225 buf[0] = CONTROL_MPAGE; 2226 buf[1] = spg; 2227 put_unaligned_be16(CDL_T2_SUB_MPAGE_LEN - 4, &buf[2]); 2228 if (spg == CDL_T2A_SUB_MPAGE) { 2229 /* 2230 * Read descriptors map to the T2A page: 2231 * set perf_vs_duration_guidleine. 2232 */ 2233 buf[7] = (cdl[0] & 0x03) << 4; 2234 desc = cdl + 64; 2235 } else { 2236 /* Write descriptors map to the T2B page */ 2237 desc = cdl + 288; 2238 } 2239 2240 /* Fill the T2 page descriptors */ 2241 b = &buf[8]; 2242 policy = get_unaligned_le32(&cdl[0]); 2243 for (i = 0; i < 7; i++, b += 32, desc += 32) { 2244 /* t2cdlunits: fixed to 10ms */ 2245 b[0] = 0x0a; 2246 2247 /* Max inactive time and its policy */ 2248 put_unaligned_be16(ata_xlat_cdl_limit(&desc[8]), &b[2]); 2249 b[6] = ((policy >> 8) & 0x0f) << 4; 2250 2251 /* Max active time and its policy */ 2252 put_unaligned_be16(ata_xlat_cdl_limit(&desc[4]), &b[4]); 2253 b[6] |= (policy >> 4) & 0x0f; 2254 2255 /* Command duration guideline and its policy */ 2256 put_unaligned_be16(ata_xlat_cdl_limit(&desc[16]), &b[10]); 2257 b[14] = policy & 0x0f; 2258 } 2259 2260 return CDL_T2_SUB_MPAGE_LEN; 2261 } 2262 2263 /* 2264 * Simulate MODE SENSE control mode page, sub-page f2h 2265 * (ATA feature control mode page). 2266 */ 2267 static unsigned int ata_msense_control_ata_feature(struct ata_device *dev, 2268 u8 *buf) 2269 { 2270 /* PS=0, SPF=1 */ 2271 buf[0] = CONTROL_MPAGE | (1 << 6); 2272 buf[1] = ATA_FEATURE_SUB_MPAGE; 2273 2274 /* 2275 * The first four bytes of ATA Feature Control mode page are a header. 2276 * The PAGE LENGTH field is the size of the page excluding the header. 2277 */ 2278 put_unaligned_be16(ATA_FEATURE_SUB_MPAGE_LEN - 4, &buf[2]); 2279 2280 if (dev->flags & ATA_DFLAG_CDL) 2281 buf[4] = 0x02; /* Support T2A and T2B pages */ 2282 else 2283 buf[4] = 0; 2284 2285 return ATA_FEATURE_SUB_MPAGE_LEN; 2286 } 2287 2288 /** 2289 * ata_msense_control - Simulate MODE SENSE control mode page 2290 * @dev: ATA device of interest 2291 * @buf: output buffer 2292 * @spg: sub-page code 2293 * @changeable: whether changeable parameters are requested 2294 * 2295 * Generate a generic MODE SENSE control mode page. 2296 * 2297 * LOCKING: 2298 * None. 2299 */ 2300 static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf, 2301 u8 spg, bool changeable) 2302 { 2303 unsigned int n; 2304 2305 switch (spg) { 2306 case 0: 2307 return ata_msense_control_spg0(dev, buf, changeable); 2308 case CDL_T2A_SUB_MPAGE: 2309 case CDL_T2B_SUB_MPAGE: 2310 return ata_msense_control_spgt2(dev, buf, spg); 2311 case ATA_FEATURE_SUB_MPAGE: 2312 return ata_msense_control_ata_feature(dev, buf); 2313 case ALL_SUB_MPAGES: 2314 n = ata_msense_control_spg0(dev, buf, changeable); 2315 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE); 2316 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE); 2317 n += ata_msense_control_ata_feature(dev, buf + n); 2318 return n; 2319 default: 2320 return 0; 2321 } 2322 } 2323 2324 /** 2325 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2326 * @buf: output buffer 2327 * @changeable: whether changeable parameters are requested 2328 * 2329 * Generate a generic MODE SENSE r/w error recovery page. 2330 * 2331 * LOCKING: 2332 * None. 2333 */ 2334 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2335 { 2336 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2337 changeable); 2338 return sizeof(def_rw_recovery_mpage); 2339 } 2340 2341 /** 2342 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2343 * @args: device IDENTIFY data / SCSI command of interest. 2344 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2345 * 2346 * Simulate MODE SENSE commands. Assume this is invoked for direct 2347 * access devices (e.g. disks) only. There should be no block 2348 * descriptor for other device types. 2349 * 2350 * LOCKING: 2351 * spin_lock_irqsave(host lock) 2352 */ 2353 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2354 { 2355 struct ata_device *dev = args->dev; 2356 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2357 static const u8 sat_blk_desc[] = { 2358 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2359 0, 2360 0, 0x2, 0x0 /* block length: 512 bytes */ 2361 }; 2362 u8 pg, spg; 2363 unsigned int ebd, page_control, six_byte; 2364 u8 dpofua = 0, bp = 0xff; 2365 u16 fp; 2366 2367 six_byte = (scsicmd[0] == MODE_SENSE); 2368 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2369 /* 2370 * LLBA bit in msense(10) ignored (compliant) 2371 */ 2372 2373 page_control = scsicmd[2] >> 6; 2374 switch (page_control) { 2375 case 0: /* current */ 2376 case 1: /* changeable */ 2377 case 2: /* defaults */ 2378 break; /* supported */ 2379 case 3: /* saved */ 2380 goto saving_not_supp; 2381 default: 2382 fp = 2; 2383 bp = 6; 2384 goto invalid_fld; 2385 } 2386 2387 if (six_byte) 2388 p += 4 + (ebd ? 8 : 0); 2389 else 2390 p += 8 + (ebd ? 8 : 0); 2391 2392 pg = scsicmd[2] & 0x3f; 2393 spg = scsicmd[3]; 2394 2395 /* 2396 * Supported subpages: all subpages and sub-pages 07h, 08h and f2h of 2397 * the control page. 2398 */ 2399 if (spg) { 2400 switch (spg) { 2401 case ALL_SUB_MPAGES: 2402 break; 2403 case CDL_T2A_SUB_MPAGE: 2404 case CDL_T2B_SUB_MPAGE: 2405 case ATA_FEATURE_SUB_MPAGE: 2406 if (dev->flags & ATA_DFLAG_CDL && pg == CONTROL_MPAGE) 2407 break; 2408 fallthrough; 2409 default: 2410 fp = 3; 2411 goto invalid_fld; 2412 } 2413 } 2414 2415 switch(pg) { 2416 case RW_RECOVERY_MPAGE: 2417 p += ata_msense_rw_recovery(p, page_control == 1); 2418 break; 2419 2420 case CACHE_MPAGE: 2421 p += ata_msense_caching(args->id, p, page_control == 1); 2422 break; 2423 2424 case CONTROL_MPAGE: 2425 p += ata_msense_control(args->dev, p, spg, page_control == 1); 2426 break; 2427 2428 case ALL_MPAGES: 2429 p += ata_msense_rw_recovery(p, page_control == 1); 2430 p += ata_msense_caching(args->id, p, page_control == 1); 2431 p += ata_msense_control(args->dev, p, spg, page_control == 1); 2432 break; 2433 2434 default: /* invalid page code */ 2435 fp = 2; 2436 goto invalid_fld; 2437 } 2438 2439 if (dev->flags & ATA_DFLAG_FUA) 2440 dpofua = 1 << 4; 2441 2442 if (six_byte) { 2443 rbuf[0] = p - rbuf - 1; 2444 rbuf[2] |= dpofua; 2445 if (ebd) { 2446 rbuf[3] = sizeof(sat_blk_desc); 2447 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2448 } 2449 } else { 2450 put_unaligned_be16(p - rbuf - 2, &rbuf[0]); 2451 rbuf[3] |= dpofua; 2452 if (ebd) { 2453 rbuf[7] = sizeof(sat_blk_desc); 2454 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2455 } 2456 } 2457 return 0; 2458 2459 invalid_fld: 2460 ata_scsi_set_invalid_field(dev, args->cmd, fp, bp); 2461 return 1; 2462 2463 saving_not_supp: 2464 ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2465 /* "Saving parameters not supported" */ 2466 return 1; 2467 } 2468 2469 /** 2470 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2471 * @args: device IDENTIFY data / SCSI command of interest. 2472 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2473 * 2474 * Simulate READ CAPACITY commands. 2475 * 2476 * LOCKING: 2477 * None. 2478 */ 2479 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2480 { 2481 struct ata_device *dev = args->dev; 2482 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2483 u32 sector_size; /* physical sector size in bytes */ 2484 u8 log2_per_phys; 2485 u16 lowest_aligned; 2486 2487 sector_size = ata_id_logical_sector_size(dev->id); 2488 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2489 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2490 2491 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2492 if (last_lba >= 0xffffffffULL) 2493 last_lba = 0xffffffff; 2494 2495 /* sector count, 32-bit */ 2496 rbuf[0] = last_lba >> (8 * 3); 2497 rbuf[1] = last_lba >> (8 * 2); 2498 rbuf[2] = last_lba >> (8 * 1); 2499 rbuf[3] = last_lba; 2500 2501 /* sector size */ 2502 rbuf[4] = sector_size >> (8 * 3); 2503 rbuf[5] = sector_size >> (8 * 2); 2504 rbuf[6] = sector_size >> (8 * 1); 2505 rbuf[7] = sector_size; 2506 } else { 2507 /* sector count, 64-bit */ 2508 rbuf[0] = last_lba >> (8 * 7); 2509 rbuf[1] = last_lba >> (8 * 6); 2510 rbuf[2] = last_lba >> (8 * 5); 2511 rbuf[3] = last_lba >> (8 * 4); 2512 rbuf[4] = last_lba >> (8 * 3); 2513 rbuf[5] = last_lba >> (8 * 2); 2514 rbuf[6] = last_lba >> (8 * 1); 2515 rbuf[7] = last_lba; 2516 2517 /* sector size */ 2518 rbuf[ 8] = sector_size >> (8 * 3); 2519 rbuf[ 9] = sector_size >> (8 * 2); 2520 rbuf[10] = sector_size >> (8 * 1); 2521 rbuf[11] = sector_size; 2522 2523 rbuf[12] = 0; 2524 rbuf[13] = log2_per_phys; 2525 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2526 rbuf[15] = lowest_aligned; 2527 2528 if (ata_id_has_trim(args->id) && 2529 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2530 rbuf[14] |= 0x80; /* LBPME */ 2531 2532 if (ata_id_has_zero_after_trim(args->id) && 2533 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2534 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2535 rbuf[14] |= 0x40; /* LBPRZ */ 2536 } 2537 } 2538 if (ata_id_zoned_cap(args->id) || 2539 args->dev->class == ATA_DEV_ZAC) 2540 rbuf[12] = (1 << 4); /* RC_BASIS */ 2541 } 2542 return 0; 2543 } 2544 2545 /** 2546 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2547 * @args: device IDENTIFY data / SCSI command of interest. 2548 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2549 * 2550 * Simulate REPORT LUNS command. 2551 * 2552 * LOCKING: 2553 * spin_lock_irqsave(host lock) 2554 */ 2555 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2556 { 2557 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2558 2559 return 0; 2560 } 2561 2562 /* 2563 * ATAPI devices typically report zero for their SCSI version, and sometimes 2564 * deviate from the spec WRT response data format. If SCSI version is 2565 * reported as zero like normal, then we make the following fixups: 2566 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a 2567 * modern device. 2568 * 2) Ensure response data format / ATAPI information are always correct. 2569 */ 2570 static void atapi_fixup_inquiry(struct scsi_cmnd *cmd) 2571 { 2572 u8 buf[4]; 2573 2574 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2575 if (buf[2] == 0) { 2576 buf[2] = 0x5; 2577 buf[3] = 0x32; 2578 } 2579 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2580 } 2581 2582 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2583 { 2584 struct scsi_cmnd *cmd = qc->scsicmd; 2585 unsigned int err_mask = qc->err_mask; 2586 2587 /* handle completion from EH */ 2588 if (unlikely(err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2589 2590 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2591 /* FIXME: not quite right; we don't want the 2592 * translation of taskfile registers into a 2593 * sense descriptors, since that's only 2594 * correct for ATA, not ATAPI 2595 */ 2596 ata_gen_passthru_sense(qc); 2597 } 2598 2599 /* SCSI EH automatically locks door if sdev->locked is 2600 * set. Sometimes door lock request continues to 2601 * fail, for example, when no media is present. This 2602 * creates a loop - SCSI EH issues door lock which 2603 * fails and gets invoked again to acquire sense data 2604 * for the failed command. 2605 * 2606 * If door lock fails, always clear sdev->locked to 2607 * avoid this infinite loop. 2608 * 2609 * This may happen before SCSI scan is complete. Make 2610 * sure qc->dev->sdev isn't NULL before dereferencing. 2611 */ 2612 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2613 qc->dev->sdev->locked = 0; 2614 2615 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2616 ata_qc_done(qc); 2617 return; 2618 } 2619 2620 /* successful completion path */ 2621 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0) 2622 atapi_fixup_inquiry(cmd); 2623 cmd->result = SAM_STAT_GOOD; 2624 2625 ata_qc_done(qc); 2626 } 2627 /** 2628 * atapi_xlat - Initialize PACKET taskfile 2629 * @qc: command structure to be initialized 2630 * 2631 * LOCKING: 2632 * spin_lock_irqsave(host lock) 2633 * 2634 * RETURNS: 2635 * Zero on success, non-zero on failure. 2636 */ 2637 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2638 { 2639 struct scsi_cmnd *scmd = qc->scsicmd; 2640 struct ata_device *dev = qc->dev; 2641 int nodata = (scmd->sc_data_direction == DMA_NONE); 2642 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2643 unsigned int nbytes; 2644 2645 memset(qc->cdb, 0, dev->cdb_len); 2646 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2647 2648 qc->complete_fn = atapi_qc_complete; 2649 2650 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2651 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2652 qc->tf.flags |= ATA_TFLAG_WRITE; 2653 } 2654 2655 qc->tf.command = ATA_CMD_PACKET; 2656 ata_qc_set_pc_nbytes(qc); 2657 2658 /* check whether ATAPI DMA is safe */ 2659 if (!nodata && !using_pio && atapi_check_dma(qc)) 2660 using_pio = 1; 2661 2662 /* Some controller variants snoop this value for Packet 2663 * transfers to do state machine and FIFO management. Thus we 2664 * want to set it properly, and for DMA where it is 2665 * effectively meaningless. 2666 */ 2667 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2668 2669 /* Most ATAPI devices which honor transfer chunk size don't 2670 * behave according to the spec when odd chunk size which 2671 * matches the transfer length is specified. If the number of 2672 * bytes to transfer is 2n+1. According to the spec, what 2673 * should happen is to indicate that 2n+1 is going to be 2674 * transferred and transfer 2n+2 bytes where the last byte is 2675 * padding. 2676 * 2677 * In practice, this doesn't happen. ATAPI devices first 2678 * indicate and transfer 2n bytes and then indicate and 2679 * transfer 2 bytes where the last byte is padding. 2680 * 2681 * This inconsistency confuses several controllers which 2682 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2683 * These controllers use actual number of transferred bytes to 2684 * update DMA pointer and transfer of 4n+2 bytes make those 2685 * controller push DMA pointer by 4n+4 bytes because SATA data 2686 * FISes are aligned to 4 bytes. This causes data corruption 2687 * and buffer overrun. 2688 * 2689 * Always setting nbytes to even number solves this problem 2690 * because then ATAPI devices don't have to split data at 2n 2691 * boundaries. 2692 */ 2693 if (nbytes & 0x1) 2694 nbytes++; 2695 2696 qc->tf.lbam = (nbytes & 0xFF); 2697 qc->tf.lbah = (nbytes >> 8); 2698 2699 if (nodata) 2700 qc->tf.protocol = ATAPI_PROT_NODATA; 2701 else if (using_pio) 2702 qc->tf.protocol = ATAPI_PROT_PIO; 2703 else { 2704 /* DMA data xfer */ 2705 qc->tf.protocol = ATAPI_PROT_DMA; 2706 qc->tf.feature |= ATAPI_PKT_DMA; 2707 2708 if ((dev->flags & ATA_DFLAG_DMADIR) && 2709 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2710 /* some SATA bridges need us to indicate data xfer direction */ 2711 qc->tf.feature |= ATAPI_DMADIR; 2712 } 2713 2714 2715 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2716 as ATAPI tape drives don't get this right otherwise */ 2717 return 0; 2718 } 2719 2720 static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno) 2721 { 2722 /* 2723 * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case), 2724 * or 2 (IDE master + slave case). However, the former case includes 2725 * libsas hosted devices which are numbered per scsi host, leading 2726 * to devno potentially being larger than 0 but with each struct 2727 * ata_device having its own struct ata_port and struct ata_link. 2728 * To accommodate these, ignore devno and always use device number 0. 2729 */ 2730 if (likely(!sata_pmp_attached(ap))) { 2731 int link_max_devices = ata_link_max_devices(&ap->link); 2732 2733 if (link_max_devices == 1) 2734 return &ap->link.device[0]; 2735 2736 if (devno < link_max_devices) 2737 return &ap->link.device[devno]; 2738 2739 return NULL; 2740 } 2741 2742 /* 2743 * For PMP-attached devices, the device number corresponds to C 2744 * (channel) of SCSI [H:C:I:L], indicating the port pmp link 2745 * for the device. 2746 */ 2747 if (devno < ap->nr_pmp_links) 2748 return &ap->pmp_link[devno].device[0]; 2749 2750 return NULL; 2751 } 2752 2753 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2754 const struct scsi_device *scsidev) 2755 { 2756 int devno; 2757 2758 /* skip commands not addressed to targets we simulate */ 2759 if (!sata_pmp_attached(ap)) { 2760 if (unlikely(scsidev->channel || scsidev->lun)) 2761 return NULL; 2762 devno = scsidev->id; 2763 } else { 2764 if (unlikely(scsidev->id || scsidev->lun)) 2765 return NULL; 2766 devno = scsidev->channel; 2767 } 2768 2769 return ata_find_dev(ap, devno); 2770 } 2771 2772 /** 2773 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2774 * @ap: ATA port to which the device is attached 2775 * @scsidev: SCSI device from which we derive the ATA device 2776 * 2777 * Given various information provided in struct scsi_cmnd, 2778 * map that onto an ATA bus, and using that mapping 2779 * determine which ata_device is associated with the 2780 * SCSI command to be sent. 2781 * 2782 * LOCKING: 2783 * spin_lock_irqsave(host lock) 2784 * 2785 * RETURNS: 2786 * Associated ATA device, or %NULL if not found. 2787 */ 2788 struct ata_device * 2789 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2790 { 2791 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2792 2793 if (unlikely(!dev || !ata_dev_enabled(dev))) 2794 return NULL; 2795 2796 return dev; 2797 } 2798 2799 /* 2800 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2801 * @byte1: Byte 1 from pass-thru CDB. 2802 * 2803 * RETURNS: 2804 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2805 */ 2806 static u8 2807 ata_scsi_map_proto(u8 byte1) 2808 { 2809 switch((byte1 & 0x1e) >> 1) { 2810 case 3: /* Non-data */ 2811 return ATA_PROT_NODATA; 2812 2813 case 6: /* DMA */ 2814 case 10: /* UDMA Data-in */ 2815 case 11: /* UDMA Data-Out */ 2816 return ATA_PROT_DMA; 2817 2818 case 4: /* PIO Data-in */ 2819 case 5: /* PIO Data-out */ 2820 return ATA_PROT_PIO; 2821 2822 case 12: /* FPDMA */ 2823 return ATA_PROT_NCQ; 2824 2825 case 0: /* Hard Reset */ 2826 case 1: /* SRST */ 2827 case 8: /* Device Diagnostic */ 2828 case 9: /* Device Reset */ 2829 case 7: /* DMA Queued */ 2830 case 15: /* Return Response Info */ 2831 default: /* Reserved */ 2832 break; 2833 } 2834 2835 return ATA_PROT_UNKNOWN; 2836 } 2837 2838 /** 2839 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2840 * @qc: command structure to be initialized 2841 * 2842 * Handles either 12, 16, or 32-byte versions of the CDB. 2843 * 2844 * RETURNS: 2845 * Zero on success, non-zero on failure. 2846 */ 2847 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2848 { 2849 struct ata_taskfile *tf = &(qc->tf); 2850 struct scsi_cmnd *scmd = qc->scsicmd; 2851 struct ata_device *dev = qc->dev; 2852 const u8 *cdb = scmd->cmnd; 2853 u16 fp; 2854 u16 cdb_offset = 0; 2855 2856 /* 7Fh variable length cmd means a ata pass-thru(32) */ 2857 if (cdb[0] == VARIABLE_LENGTH_CMD) 2858 cdb_offset = 9; 2859 2860 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]); 2861 if (tf->protocol == ATA_PROT_UNKNOWN) { 2862 fp = 1; 2863 goto invalid_fld; 2864 } 2865 2866 if ((cdb[2 + cdb_offset] & 0x3) == 0) { 2867 /* 2868 * When T_LENGTH is zero (No data is transferred), dir should 2869 * be DMA_NONE. 2870 */ 2871 if (scmd->sc_data_direction != DMA_NONE) { 2872 fp = 2 + cdb_offset; 2873 goto invalid_fld; 2874 } 2875 2876 if (ata_is_ncq(tf->protocol)) 2877 tf->protocol = ATA_PROT_NCQ_NODATA; 2878 } 2879 2880 /* enable LBA */ 2881 tf->flags |= ATA_TFLAG_LBA; 2882 2883 /* 2884 * 12 and 16 byte CDBs use different offsets to 2885 * provide the various register values. 2886 */ 2887 switch (cdb[0]) { 2888 case ATA_16: 2889 /* 2890 * 16-byte CDB - may contain extended commands. 2891 * 2892 * If that is the case, copy the upper byte register values. 2893 */ 2894 if (cdb[1] & 0x01) { 2895 tf->hob_feature = cdb[3]; 2896 tf->hob_nsect = cdb[5]; 2897 tf->hob_lbal = cdb[7]; 2898 tf->hob_lbam = cdb[9]; 2899 tf->hob_lbah = cdb[11]; 2900 tf->flags |= ATA_TFLAG_LBA48; 2901 } else 2902 tf->flags &= ~ATA_TFLAG_LBA48; 2903 2904 /* 2905 * Always copy low byte, device and command registers. 2906 */ 2907 tf->feature = cdb[4]; 2908 tf->nsect = cdb[6]; 2909 tf->lbal = cdb[8]; 2910 tf->lbam = cdb[10]; 2911 tf->lbah = cdb[12]; 2912 tf->device = cdb[13]; 2913 tf->command = cdb[14]; 2914 break; 2915 case ATA_12: 2916 /* 2917 * 12-byte CDB - incapable of extended commands. 2918 */ 2919 tf->flags &= ~ATA_TFLAG_LBA48; 2920 2921 tf->feature = cdb[3]; 2922 tf->nsect = cdb[4]; 2923 tf->lbal = cdb[5]; 2924 tf->lbam = cdb[6]; 2925 tf->lbah = cdb[7]; 2926 tf->device = cdb[8]; 2927 tf->command = cdb[9]; 2928 break; 2929 default: 2930 /* 2931 * 32-byte CDB - may contain extended command fields. 2932 * 2933 * If that is the case, copy the upper byte register values. 2934 */ 2935 if (cdb[10] & 0x01) { 2936 tf->hob_feature = cdb[20]; 2937 tf->hob_nsect = cdb[22]; 2938 tf->hob_lbal = cdb[16]; 2939 tf->hob_lbam = cdb[15]; 2940 tf->hob_lbah = cdb[14]; 2941 tf->flags |= ATA_TFLAG_LBA48; 2942 } else 2943 tf->flags &= ~ATA_TFLAG_LBA48; 2944 2945 tf->feature = cdb[21]; 2946 tf->nsect = cdb[23]; 2947 tf->lbal = cdb[19]; 2948 tf->lbam = cdb[18]; 2949 tf->lbah = cdb[17]; 2950 tf->device = cdb[24]; 2951 tf->command = cdb[25]; 2952 tf->auxiliary = get_unaligned_be32(&cdb[28]); 2953 break; 2954 } 2955 2956 /* For NCQ commands copy the tag value */ 2957 if (ata_is_ncq(tf->protocol)) 2958 tf->nsect = qc->hw_tag << 3; 2959 2960 /* enforce correct master/slave bit */ 2961 tf->device = dev->devno ? 2962 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2963 2964 switch (tf->command) { 2965 /* READ/WRITE LONG use a non-standard sect_size */ 2966 case ATA_CMD_READ_LONG: 2967 case ATA_CMD_READ_LONG_ONCE: 2968 case ATA_CMD_WRITE_LONG: 2969 case ATA_CMD_WRITE_LONG_ONCE: 2970 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) { 2971 fp = 1; 2972 goto invalid_fld; 2973 } 2974 qc->sect_size = scsi_bufflen(scmd); 2975 break; 2976 2977 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2978 case ATA_CMD_CFA_WRITE_NE: 2979 case ATA_CMD_CFA_TRANS_SECT: 2980 case ATA_CMD_CFA_WRITE_MULT_NE: 2981 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2982 case ATA_CMD_READ: 2983 case ATA_CMD_READ_EXT: 2984 case ATA_CMD_READ_QUEUED: 2985 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2986 case ATA_CMD_FPDMA_READ: 2987 case ATA_CMD_READ_MULTI: 2988 case ATA_CMD_READ_MULTI_EXT: 2989 case ATA_CMD_PIO_READ: 2990 case ATA_CMD_PIO_READ_EXT: 2991 case ATA_CMD_READ_STREAM_DMA_EXT: 2992 case ATA_CMD_READ_STREAM_EXT: 2993 case ATA_CMD_VERIFY: 2994 case ATA_CMD_VERIFY_EXT: 2995 case ATA_CMD_WRITE: 2996 case ATA_CMD_WRITE_EXT: 2997 case ATA_CMD_WRITE_FUA_EXT: 2998 case ATA_CMD_WRITE_QUEUED: 2999 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 3000 case ATA_CMD_FPDMA_WRITE: 3001 case ATA_CMD_WRITE_MULTI: 3002 case ATA_CMD_WRITE_MULTI_EXT: 3003 case ATA_CMD_WRITE_MULTI_FUA_EXT: 3004 case ATA_CMD_PIO_WRITE: 3005 case ATA_CMD_PIO_WRITE_EXT: 3006 case ATA_CMD_WRITE_STREAM_DMA_EXT: 3007 case ATA_CMD_WRITE_STREAM_EXT: 3008 qc->sect_size = scmd->device->sector_size; 3009 break; 3010 3011 /* Everything else uses 512 byte "sectors" */ 3012 default: 3013 qc->sect_size = ATA_SECT_SIZE; 3014 } 3015 3016 /* 3017 * Set flags so that all registers will be written, pass on 3018 * write indication (used for PIO/DMA setup), result TF is 3019 * copied back and we don't whine too much about its failure. 3020 */ 3021 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3022 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3023 tf->flags |= ATA_TFLAG_WRITE; 3024 3025 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3026 3027 /* 3028 * Set transfer length. 3029 * 3030 * TODO: find out if we need to do more here to 3031 * cover scatter/gather case. 3032 */ 3033 ata_qc_set_pc_nbytes(qc); 3034 3035 /* We may not issue DMA commands if no DMA mode is set */ 3036 if (tf->protocol == ATA_PROT_DMA && !ata_dma_enabled(dev)) { 3037 fp = 1; 3038 goto invalid_fld; 3039 } 3040 3041 /* We may not issue NCQ commands to devices not supporting NCQ */ 3042 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) { 3043 fp = 1; 3044 goto invalid_fld; 3045 } 3046 3047 /* sanity check for pio multi commands */ 3048 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) { 3049 fp = 1; 3050 goto invalid_fld; 3051 } 3052 3053 if (is_multi_taskfile(tf)) { 3054 unsigned int multi_count = 1 << (cdb[1] >> 5); 3055 3056 /* compare the passed through multi_count 3057 * with the cached multi_count of libata 3058 */ 3059 if (multi_count != dev->multi_count) 3060 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3061 multi_count); 3062 } 3063 3064 /* 3065 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3066 * SET_FEATURES - XFER MODE must be preceded/succeeded 3067 * by an update to hardware-specific registers for each 3068 * controller (i.e. the reason for ->set_piomode(), 3069 * ->set_dmamode(), and ->post_set_mode() hooks). 3070 */ 3071 if (tf->command == ATA_CMD_SET_FEATURES && 3072 tf->feature == SETFEATURES_XFER) { 3073 fp = (cdb[0] == ATA_16) ? 4 : 3; 3074 goto invalid_fld; 3075 } 3076 3077 /* 3078 * Filter TPM commands by default. These provide an 3079 * essentially uncontrolled encrypted "back door" between 3080 * applications and the disk. Set libata.allow_tpm=1 if you 3081 * have a real reason for wanting to use them. This ensures 3082 * that installed software cannot easily mess stuff up without 3083 * user intent. DVR type users will probably ship with this enabled 3084 * for movie content management. 3085 * 3086 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3087 * for this and should do in future but that it is not sufficient as 3088 * DCS is an optional feature set. Thus we also do the software filter 3089 * so that we comply with the TC consortium stated goal that the user 3090 * can turn off TC features of their system. 3091 */ 3092 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) { 3093 fp = (cdb[0] == ATA_16) ? 14 : 9; 3094 goto invalid_fld; 3095 } 3096 3097 return 0; 3098 3099 invalid_fld: 3100 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff); 3101 return 1; 3102 } 3103 3104 /** 3105 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim 3106 * @cmd: SCSI command being translated 3107 * @trmax: Maximum number of entries that will fit in sector_size bytes. 3108 * @sector: Starting sector 3109 * @count: Total Range of request in logical sectors 3110 * 3111 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted 3112 * descriptor. 3113 * 3114 * Upto 64 entries of the format: 3115 * 63:48 Range Length 3116 * 47:0 LBA 3117 * 3118 * Range Length of 0 is ignored. 3119 * LBA's should be sorted order and not overlap. 3120 * 3121 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET 3122 * 3123 * Return: Number of bytes copied into sglist. 3124 */ 3125 static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax, 3126 u64 sector, u32 count) 3127 { 3128 struct scsi_device *sdp = cmd->device; 3129 size_t len = sdp->sector_size; 3130 size_t r; 3131 __le64 *buf; 3132 u32 i = 0; 3133 unsigned long flags; 3134 3135 WARN_ON(len > ATA_SCSI_RBUF_SIZE); 3136 3137 if (len > ATA_SCSI_RBUF_SIZE) 3138 len = ATA_SCSI_RBUF_SIZE; 3139 3140 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 3141 buf = ((void *)ata_scsi_rbuf); 3142 memset(buf, 0, len); 3143 while (i < trmax) { 3144 u64 entry = sector | 3145 ((u64)(count > 0xffff ? 0xffff : count) << 48); 3146 buf[i++] = __cpu_to_le64(entry); 3147 if (count <= 0xffff) 3148 break; 3149 count -= 0xffff; 3150 sector += 0xffff; 3151 } 3152 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len); 3153 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 3154 3155 return r; 3156 } 3157 3158 /** 3159 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same 3160 * @qc: Command to be translated 3161 * 3162 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or 3163 * an SCT Write Same command. 3164 * Based on WRITE SAME has the UNMAP flag: 3165 * 3166 * - When set translate to DSM TRIM 3167 * - When clear translate to SCT Write Same 3168 */ 3169 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3170 { 3171 struct ata_taskfile *tf = &qc->tf; 3172 struct scsi_cmnd *scmd = qc->scsicmd; 3173 struct scsi_device *sdp = scmd->device; 3174 size_t len = sdp->sector_size; 3175 struct ata_device *dev = qc->dev; 3176 const u8 *cdb = scmd->cmnd; 3177 u64 block; 3178 u32 n_block; 3179 const u32 trmax = len >> 3; 3180 u32 size; 3181 u16 fp; 3182 u8 bp = 0xff; 3183 u8 unmap = cdb[1] & 0x8; 3184 3185 /* we may not issue DMA commands if no DMA mode is set */ 3186 if (unlikely(!ata_dma_enabled(dev))) 3187 goto invalid_opcode; 3188 3189 /* 3190 * We only allow sending this command through the block layer, 3191 * as it modifies the DATA OUT buffer, which would corrupt user 3192 * memory for SG_IO commands. 3193 */ 3194 if (unlikely(blk_rq_is_passthrough(scsi_cmd_to_rq(scmd)))) 3195 goto invalid_opcode; 3196 3197 if (unlikely(scmd->cmd_len < 16)) { 3198 fp = 15; 3199 goto invalid_fld; 3200 } 3201 scsi_16_lba_len(cdb, &block, &n_block); 3202 3203 if (!unmap || 3204 (dev->horkage & ATA_HORKAGE_NOTRIM) || 3205 !ata_id_has_trim(dev->id)) { 3206 fp = 1; 3207 bp = 3; 3208 goto invalid_fld; 3209 } 3210 /* If the request is too large the cmd is invalid */ 3211 if (n_block > 0xffff * trmax) { 3212 fp = 2; 3213 goto invalid_fld; 3214 } 3215 3216 /* 3217 * WRITE SAME always has a sector sized buffer as payload, this 3218 * should never be a multiple entry S/G list. 3219 */ 3220 if (!scsi_sg_count(scmd)) 3221 goto invalid_param_len; 3222 3223 /* 3224 * size must match sector size in bytes 3225 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count) 3226 * is defined as number of 512 byte blocks to be transferred. 3227 */ 3228 3229 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); 3230 if (size != len) 3231 goto invalid_param_len; 3232 3233 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3234 /* Newer devices support queued TRIM commands */ 3235 tf->protocol = ATA_PROT_NCQ; 3236 tf->command = ATA_CMD_FPDMA_SEND; 3237 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3238 tf->nsect = qc->hw_tag << 3; 3239 tf->hob_feature = (size / 512) >> 8; 3240 tf->feature = size / 512; 3241 3242 tf->auxiliary = 1; 3243 } else { 3244 tf->protocol = ATA_PROT_DMA; 3245 tf->hob_feature = 0; 3246 tf->feature = ATA_DSM_TRIM; 3247 tf->hob_nsect = (size / 512) >> 8; 3248 tf->nsect = size / 512; 3249 tf->command = ATA_CMD_DSM; 3250 } 3251 3252 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3253 ATA_TFLAG_WRITE; 3254 3255 ata_qc_set_pc_nbytes(qc); 3256 3257 return 0; 3258 3259 invalid_fld: 3260 ata_scsi_set_invalid_field(dev, scmd, fp, bp); 3261 return 1; 3262 invalid_param_len: 3263 /* "Parameter list length error" */ 3264 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3265 return 1; 3266 invalid_opcode: 3267 /* "Invalid command operation code" */ 3268 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0); 3269 return 1; 3270 } 3271 3272 /** 3273 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN 3274 * @args: device MAINTENANCE_IN data / SCSI command of interest. 3275 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 3276 * 3277 * Yields a subset to satisfy scsi_report_opcode() 3278 * 3279 * LOCKING: 3280 * spin_lock_irqsave(host lock) 3281 */ 3282 static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf) 3283 { 3284 struct ata_device *dev = args->dev; 3285 u8 *cdb = args->cmd->cmnd; 3286 u8 supported = 0, cdlp = 0, rwcdlp = 0; 3287 unsigned int err = 0; 3288 3289 if (cdb[2] != 1 && cdb[2] != 3) { 3290 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]); 3291 err = 2; 3292 goto out; 3293 } 3294 3295 switch (cdb[3]) { 3296 case INQUIRY: 3297 case MODE_SENSE: 3298 case MODE_SENSE_10: 3299 case READ_CAPACITY: 3300 case SERVICE_ACTION_IN_16: 3301 case REPORT_LUNS: 3302 case REQUEST_SENSE: 3303 case SYNCHRONIZE_CACHE: 3304 case SYNCHRONIZE_CACHE_16: 3305 case REZERO_UNIT: 3306 case SEEK_6: 3307 case SEEK_10: 3308 case TEST_UNIT_READY: 3309 case SEND_DIAGNOSTIC: 3310 case MAINTENANCE_IN: 3311 case READ_6: 3312 case READ_10: 3313 case WRITE_6: 3314 case WRITE_10: 3315 case ATA_12: 3316 case ATA_16: 3317 case VERIFY: 3318 case VERIFY_16: 3319 case MODE_SELECT: 3320 case MODE_SELECT_10: 3321 case START_STOP: 3322 supported = 3; 3323 break; 3324 case READ_16: 3325 supported = 3; 3326 if (dev->flags & ATA_DFLAG_CDL) { 3327 /* 3328 * CDL read descriptors map to the T2A page, that is, 3329 * rwcdlp = 0x01 and cdlp = 0x01 3330 */ 3331 rwcdlp = 0x01; 3332 cdlp = 0x01 << 3; 3333 } 3334 break; 3335 case WRITE_16: 3336 supported = 3; 3337 if (dev->flags & ATA_DFLAG_CDL) { 3338 /* 3339 * CDL write descriptors map to the T2B page, that is, 3340 * rwcdlp = 0x01 and cdlp = 0x02 3341 */ 3342 rwcdlp = 0x01; 3343 cdlp = 0x02 << 3; 3344 } 3345 break; 3346 case ZBC_IN: 3347 case ZBC_OUT: 3348 if (ata_id_zoned_cap(dev->id) || 3349 dev->class == ATA_DEV_ZAC) 3350 supported = 3; 3351 break; 3352 case SECURITY_PROTOCOL_IN: 3353 case SECURITY_PROTOCOL_OUT: 3354 if (dev->flags & ATA_DFLAG_TRUSTED) 3355 supported = 3; 3356 break; 3357 default: 3358 break; 3359 } 3360 out: 3361 /* One command format */ 3362 rbuf[0] = rwcdlp; 3363 rbuf[1] = cdlp | supported; 3364 return err; 3365 } 3366 3367 /** 3368 * ata_scsi_report_zones_complete - convert ATA output 3369 * @qc: command structure returning the data 3370 * 3371 * Convert T-13 little-endian field representation into 3372 * T-10 big-endian field representation. 3373 * What a mess. 3374 */ 3375 static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc) 3376 { 3377 struct scsi_cmnd *scmd = qc->scsicmd; 3378 struct sg_mapping_iter miter; 3379 unsigned long flags; 3380 unsigned int bytes = 0; 3381 3382 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd), 3383 SG_MITER_TO_SG | SG_MITER_ATOMIC); 3384 3385 local_irq_save(flags); 3386 while (sg_miter_next(&miter)) { 3387 unsigned int offset = 0; 3388 3389 if (bytes == 0) { 3390 char *hdr; 3391 u32 list_length; 3392 u64 max_lba, opt_lba; 3393 u16 same; 3394 3395 /* Swizzle header */ 3396 hdr = miter.addr; 3397 list_length = get_unaligned_le32(&hdr[0]); 3398 same = get_unaligned_le16(&hdr[4]); 3399 max_lba = get_unaligned_le64(&hdr[8]); 3400 opt_lba = get_unaligned_le64(&hdr[16]); 3401 put_unaligned_be32(list_length, &hdr[0]); 3402 hdr[4] = same & 0xf; 3403 put_unaligned_be64(max_lba, &hdr[8]); 3404 put_unaligned_be64(opt_lba, &hdr[16]); 3405 offset += 64; 3406 bytes += 64; 3407 } 3408 while (offset < miter.length) { 3409 char *rec; 3410 u8 cond, type, non_seq, reset; 3411 u64 size, start, wp; 3412 3413 /* Swizzle zone descriptor */ 3414 rec = miter.addr + offset; 3415 type = rec[0] & 0xf; 3416 cond = (rec[1] >> 4) & 0xf; 3417 non_seq = (rec[1] & 2); 3418 reset = (rec[1] & 1); 3419 size = get_unaligned_le64(&rec[8]); 3420 start = get_unaligned_le64(&rec[16]); 3421 wp = get_unaligned_le64(&rec[24]); 3422 rec[0] = type; 3423 rec[1] = (cond << 4) | non_seq | reset; 3424 put_unaligned_be64(size, &rec[8]); 3425 put_unaligned_be64(start, &rec[16]); 3426 put_unaligned_be64(wp, &rec[24]); 3427 WARN_ON(offset + 64 > miter.length); 3428 offset += 64; 3429 bytes += 64; 3430 } 3431 } 3432 sg_miter_stop(&miter); 3433 local_irq_restore(flags); 3434 3435 ata_scsi_qc_complete(qc); 3436 } 3437 3438 static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc) 3439 { 3440 struct ata_taskfile *tf = &qc->tf; 3441 struct scsi_cmnd *scmd = qc->scsicmd; 3442 const u8 *cdb = scmd->cmnd; 3443 u16 sect, fp = (u16)-1; 3444 u8 sa, options, bp = 0xff; 3445 u64 block; 3446 u32 n_block; 3447 3448 if (unlikely(scmd->cmd_len < 16)) { 3449 ata_dev_warn(qc->dev, "invalid cdb length %d\n", 3450 scmd->cmd_len); 3451 fp = 15; 3452 goto invalid_fld; 3453 } 3454 scsi_16_lba_len(cdb, &block, &n_block); 3455 if (n_block != scsi_bufflen(scmd)) { 3456 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n", 3457 n_block, scsi_bufflen(scmd)); 3458 goto invalid_param_len; 3459 } 3460 sa = cdb[1] & 0x1f; 3461 if (sa != ZI_REPORT_ZONES) { 3462 ata_dev_warn(qc->dev, "invalid service action %d\n", sa); 3463 fp = 1; 3464 goto invalid_fld; 3465 } 3466 /* 3467 * ZAC allows only for transfers in 512 byte blocks, 3468 * and uses a 16 bit value for the transfer count. 3469 */ 3470 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) { 3471 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block); 3472 goto invalid_param_len; 3473 } 3474 sect = n_block / 512; 3475 options = cdb[14] & 0xbf; 3476 3477 if (ata_ncq_enabled(qc->dev) && 3478 ata_fpdma_zac_mgmt_in_supported(qc->dev)) { 3479 tf->protocol = ATA_PROT_NCQ; 3480 tf->command = ATA_CMD_FPDMA_RECV; 3481 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f; 3482 tf->nsect = qc->hw_tag << 3; 3483 tf->feature = sect & 0xff; 3484 tf->hob_feature = (sect >> 8) & 0xff; 3485 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8); 3486 } else { 3487 tf->command = ATA_CMD_ZAC_MGMT_IN; 3488 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES; 3489 tf->protocol = ATA_PROT_DMA; 3490 tf->hob_feature = options; 3491 tf->hob_nsect = (sect >> 8) & 0xff; 3492 tf->nsect = sect & 0xff; 3493 } 3494 tf->device = ATA_LBA; 3495 tf->lbah = (block >> 16) & 0xff; 3496 tf->lbam = (block >> 8) & 0xff; 3497 tf->lbal = block & 0xff; 3498 tf->hob_lbah = (block >> 40) & 0xff; 3499 tf->hob_lbam = (block >> 32) & 0xff; 3500 tf->hob_lbal = (block >> 24) & 0xff; 3501 3502 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3503 qc->flags |= ATA_QCFLAG_RESULT_TF; 3504 3505 ata_qc_set_pc_nbytes(qc); 3506 3507 qc->complete_fn = ata_scsi_report_zones_complete; 3508 3509 return 0; 3510 3511 invalid_fld: 3512 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3513 return 1; 3514 3515 invalid_param_len: 3516 /* "Parameter list length error" */ 3517 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3518 return 1; 3519 } 3520 3521 static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc) 3522 { 3523 struct ata_taskfile *tf = &qc->tf; 3524 struct scsi_cmnd *scmd = qc->scsicmd; 3525 struct ata_device *dev = qc->dev; 3526 const u8 *cdb = scmd->cmnd; 3527 u8 all, sa; 3528 u64 block; 3529 u32 n_block; 3530 u16 fp = (u16)-1; 3531 3532 if (unlikely(scmd->cmd_len < 16)) { 3533 fp = 15; 3534 goto invalid_fld; 3535 } 3536 3537 sa = cdb[1] & 0x1f; 3538 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) && 3539 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) { 3540 fp = 1; 3541 goto invalid_fld; 3542 } 3543 3544 scsi_16_lba_len(cdb, &block, &n_block); 3545 if (n_block) { 3546 /* 3547 * ZAC MANAGEMENT OUT doesn't define any length 3548 */ 3549 goto invalid_param_len; 3550 } 3551 3552 all = cdb[14] & 0x1; 3553 if (all) { 3554 /* 3555 * Ignore the block address (zone ID) as defined by ZBC. 3556 */ 3557 block = 0; 3558 } else if (block >= dev->n_sectors) { 3559 /* 3560 * Block must be a valid zone ID (a zone start LBA). 3561 */ 3562 fp = 2; 3563 goto invalid_fld; 3564 } 3565 3566 if (ata_ncq_enabled(qc->dev) && 3567 ata_fpdma_zac_mgmt_out_supported(qc->dev)) { 3568 tf->protocol = ATA_PROT_NCQ_NODATA; 3569 tf->command = ATA_CMD_NCQ_NON_DATA; 3570 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT; 3571 tf->nsect = qc->hw_tag << 3; 3572 tf->auxiliary = sa | ((u16)all << 8); 3573 } else { 3574 tf->protocol = ATA_PROT_NODATA; 3575 tf->command = ATA_CMD_ZAC_MGMT_OUT; 3576 tf->feature = sa; 3577 tf->hob_feature = all; 3578 } 3579 tf->lbah = (block >> 16) & 0xff; 3580 tf->lbam = (block >> 8) & 0xff; 3581 tf->lbal = block & 0xff; 3582 tf->hob_lbah = (block >> 40) & 0xff; 3583 tf->hob_lbam = (block >> 32) & 0xff; 3584 tf->hob_lbal = (block >> 24) & 0xff; 3585 tf->device = ATA_LBA; 3586 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3587 3588 return 0; 3589 3590 invalid_fld: 3591 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 3592 return 1; 3593 invalid_param_len: 3594 /* "Parameter list length error" */ 3595 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3596 return 1; 3597 } 3598 3599 /** 3600 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3601 * @qc: Storage for translated ATA taskfile 3602 * @buf: input buffer 3603 * @len: number of valid bytes in the input buffer 3604 * @fp: out parameter for the failed field on error 3605 * 3606 * Prepare a taskfile to modify caching information for the device. 3607 * 3608 * LOCKING: 3609 * None. 3610 */ 3611 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3612 const u8 *buf, int len, u16 *fp) 3613 { 3614 struct ata_taskfile *tf = &qc->tf; 3615 struct ata_device *dev = qc->dev; 3616 u8 mpage[CACHE_MPAGE_LEN]; 3617 u8 wce; 3618 int i; 3619 3620 /* 3621 * The first two bytes of def_cache_mpage are a header, so offsets 3622 * in mpage are off by 2 compared to buf. Same for len. 3623 */ 3624 3625 if (len != CACHE_MPAGE_LEN - 2) { 3626 *fp = min(len, CACHE_MPAGE_LEN - 2); 3627 return -EINVAL; 3628 } 3629 3630 wce = buf[0] & (1 << 2); 3631 3632 /* 3633 * Check that read-only bits are not modified. 3634 */ 3635 ata_msense_caching(dev->id, mpage, false); 3636 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) { 3637 if (i == 0) 3638 continue; 3639 if (mpage[i + 2] != buf[i]) { 3640 *fp = i; 3641 return -EINVAL; 3642 } 3643 } 3644 3645 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3646 tf->protocol = ATA_PROT_NODATA; 3647 tf->nsect = 0; 3648 tf->command = ATA_CMD_SET_FEATURES; 3649 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3650 return 0; 3651 } 3652 3653 /* 3654 * Simulate MODE SELECT control mode page, sub-page 0. 3655 */ 3656 static int ata_mselect_control_spg0(struct ata_queued_cmd *qc, 3657 const u8 *buf, int len, u16 *fp) 3658 { 3659 struct ata_device *dev = qc->dev; 3660 u8 mpage[CONTROL_MPAGE_LEN]; 3661 u8 d_sense; 3662 int i; 3663 3664 /* 3665 * The first two bytes of def_control_mpage are a header, so offsets 3666 * in mpage are off by 2 compared to buf. Same for len. 3667 */ 3668 3669 if (len != CONTROL_MPAGE_LEN - 2) { 3670 *fp = min(len, CONTROL_MPAGE_LEN - 2); 3671 return -EINVAL; 3672 } 3673 3674 d_sense = buf[0] & (1 << 2); 3675 3676 /* 3677 * Check that read-only bits are not modified. 3678 */ 3679 ata_msense_control_spg0(dev, mpage, false); 3680 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) { 3681 if (i == 0) 3682 continue; 3683 if (mpage[2 + i] != buf[i]) { 3684 *fp = i; 3685 return -EINVAL; 3686 } 3687 } 3688 if (d_sense & (1 << 2)) 3689 dev->flags |= ATA_DFLAG_D_SENSE; 3690 else 3691 dev->flags &= ~ATA_DFLAG_D_SENSE; 3692 return 0; 3693 } 3694 3695 /* 3696 * Translate MODE SELECT control mode page, sub-pages f2h (ATA feature mode 3697 * page) into a SET FEATURES command. 3698 */ 3699 static unsigned int ata_mselect_control_ata_feature(struct ata_queued_cmd *qc, 3700 const u8 *buf, int len, 3701 u16 *fp) 3702 { 3703 struct ata_device *dev = qc->dev; 3704 struct ata_taskfile *tf = &qc->tf; 3705 u8 cdl_action; 3706 3707 /* 3708 * The first four bytes of ATA Feature Control mode page are a header, 3709 * so offsets in mpage are off by 4 compared to buf. Same for len. 3710 */ 3711 if (len != ATA_FEATURE_SUB_MPAGE_LEN - 4) { 3712 *fp = min(len, ATA_FEATURE_SUB_MPAGE_LEN - 4); 3713 return -EINVAL; 3714 } 3715 3716 /* Check cdl_ctrl */ 3717 switch (buf[0] & 0x03) { 3718 case 0: 3719 /* Disable CDL */ 3720 cdl_action = 0; 3721 dev->flags &= ~ATA_DFLAG_CDL_ENABLED; 3722 break; 3723 case 0x02: 3724 /* Enable CDL T2A/T2B: NCQ priority must be disabled */ 3725 if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED) { 3726 ata_dev_err(dev, 3727 "NCQ priority must be disabled to enable CDL\n"); 3728 return -EINVAL; 3729 } 3730 cdl_action = 1; 3731 dev->flags |= ATA_DFLAG_CDL_ENABLED; 3732 break; 3733 default: 3734 *fp = 0; 3735 return -EINVAL; 3736 } 3737 3738 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3739 tf->protocol = ATA_PROT_NODATA; 3740 tf->command = ATA_CMD_SET_FEATURES; 3741 tf->feature = SETFEATURES_CDL; 3742 tf->nsect = cdl_action; 3743 3744 return 1; 3745 } 3746 3747 /** 3748 * ata_mselect_control - Simulate MODE SELECT for control page 3749 * @qc: Storage for translated ATA taskfile 3750 * @spg: target sub-page of the control page 3751 * @buf: input buffer 3752 * @len: number of valid bytes in the input buffer 3753 * @fp: out parameter for the failed field on error 3754 * 3755 * Prepare a taskfile to modify caching information for the device. 3756 * 3757 * LOCKING: 3758 * None. 3759 */ 3760 static int ata_mselect_control(struct ata_queued_cmd *qc, u8 spg, 3761 const u8 *buf, int len, u16 *fp) 3762 { 3763 switch (spg) { 3764 case 0: 3765 return ata_mselect_control_spg0(qc, buf, len, fp); 3766 case ATA_FEATURE_SUB_MPAGE: 3767 return ata_mselect_control_ata_feature(qc, buf, len, fp); 3768 default: 3769 return -EINVAL; 3770 } 3771 } 3772 3773 /** 3774 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands 3775 * @qc: Storage for translated ATA taskfile 3776 * 3777 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3778 * Assume this is invoked for direct access devices (e.g. disks) only. 3779 * There should be no block descriptor for other device types. 3780 * 3781 * LOCKING: 3782 * spin_lock_irqsave(host lock) 3783 */ 3784 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3785 { 3786 struct scsi_cmnd *scmd = qc->scsicmd; 3787 const u8 *cdb = scmd->cmnd; 3788 u8 pg, spg; 3789 unsigned six_byte, pg_len, hdr_len, bd_len; 3790 int len, ret; 3791 u16 fp = (u16)-1; 3792 u8 bp = 0xff; 3793 u8 buffer[64]; 3794 const u8 *p = buffer; 3795 3796 six_byte = (cdb[0] == MODE_SELECT); 3797 if (six_byte) { 3798 if (scmd->cmd_len < 5) { 3799 fp = 4; 3800 goto invalid_fld; 3801 } 3802 3803 len = cdb[4]; 3804 hdr_len = 4; 3805 } else { 3806 if (scmd->cmd_len < 9) { 3807 fp = 8; 3808 goto invalid_fld; 3809 } 3810 3811 len = get_unaligned_be16(&cdb[7]); 3812 hdr_len = 8; 3813 } 3814 3815 /* We only support PF=1, SP=0. */ 3816 if ((cdb[1] & 0x11) != 0x10) { 3817 fp = 1; 3818 bp = (cdb[1] & 0x01) ? 1 : 5; 3819 goto invalid_fld; 3820 } 3821 3822 /* Test early for possible overrun. */ 3823 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3824 goto invalid_param_len; 3825 3826 /* Move past header and block descriptors. */ 3827 if (len < hdr_len) 3828 goto invalid_param_len; 3829 3830 if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd), 3831 buffer, sizeof(buffer))) 3832 goto invalid_param_len; 3833 3834 if (six_byte) 3835 bd_len = p[3]; 3836 else 3837 bd_len = get_unaligned_be16(&p[6]); 3838 3839 len -= hdr_len; 3840 p += hdr_len; 3841 if (len < bd_len) 3842 goto invalid_param_len; 3843 if (bd_len != 0 && bd_len != 8) { 3844 fp = (six_byte) ? 3 : 6; 3845 fp += bd_len + hdr_len; 3846 goto invalid_param; 3847 } 3848 3849 len -= bd_len; 3850 p += bd_len; 3851 if (len == 0) 3852 goto skip; 3853 3854 /* Parse both possible formats for the mode page headers. */ 3855 pg = p[0] & 0x3f; 3856 if (p[0] & 0x40) { 3857 if (len < 4) 3858 goto invalid_param_len; 3859 3860 spg = p[1]; 3861 pg_len = get_unaligned_be16(&p[2]); 3862 p += 4; 3863 len -= 4; 3864 } else { 3865 if (len < 2) 3866 goto invalid_param_len; 3867 3868 spg = 0; 3869 pg_len = p[1]; 3870 p += 2; 3871 len -= 2; 3872 } 3873 3874 /* 3875 * Supported subpages: all subpages and ATA feature sub-page f2h of 3876 * the control page. 3877 */ 3878 if (spg) { 3879 switch (spg) { 3880 case ALL_SUB_MPAGES: 3881 /* All subpages is not supported for the control page */ 3882 if (pg == CONTROL_MPAGE) { 3883 fp = (p[0] & 0x40) ? 1 : 0; 3884 fp += hdr_len + bd_len; 3885 goto invalid_param; 3886 } 3887 break; 3888 case ATA_FEATURE_SUB_MPAGE: 3889 if (qc->dev->flags & ATA_DFLAG_CDL && 3890 pg == CONTROL_MPAGE) 3891 break; 3892 fallthrough; 3893 default: 3894 fp = (p[0] & 0x40) ? 1 : 0; 3895 fp += hdr_len + bd_len; 3896 goto invalid_param; 3897 } 3898 } 3899 if (pg_len > len) 3900 goto invalid_param_len; 3901 3902 switch (pg) { 3903 case CACHE_MPAGE: 3904 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) { 3905 fp += hdr_len + bd_len; 3906 goto invalid_param; 3907 } 3908 break; 3909 case CONTROL_MPAGE: 3910 ret = ata_mselect_control(qc, spg, p, pg_len, &fp); 3911 if (ret < 0) { 3912 fp += hdr_len + bd_len; 3913 goto invalid_param; 3914 } 3915 if (!ret) 3916 goto skip; /* No ATA command to send */ 3917 break; 3918 default: 3919 /* Invalid page code */ 3920 fp = bd_len + hdr_len; 3921 goto invalid_param; 3922 } 3923 3924 /* 3925 * Only one page has changeable data, so we only support setting one 3926 * page at a time. 3927 */ 3928 if (len > pg_len) 3929 goto invalid_param; 3930 3931 return 0; 3932 3933 invalid_fld: 3934 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3935 return 1; 3936 3937 invalid_param: 3938 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp); 3939 return 1; 3940 3941 invalid_param_len: 3942 /* "Parameter list length error" */ 3943 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3944 return 1; 3945 3946 skip: 3947 scmd->result = SAM_STAT_GOOD; 3948 return 1; 3949 } 3950 3951 static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma) 3952 { 3953 if (len == 0) 3954 return ATA_CMD_TRUSTED_NONDATA; 3955 else if (send) 3956 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND; 3957 else 3958 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV; 3959 } 3960 3961 static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc) 3962 { 3963 struct scsi_cmnd *scmd = qc->scsicmd; 3964 const u8 *cdb = scmd->cmnd; 3965 struct ata_taskfile *tf = &qc->tf; 3966 u8 secp = cdb[1]; 3967 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT); 3968 u16 spsp = get_unaligned_be16(&cdb[2]); 3969 u32 len = get_unaligned_be32(&cdb[6]); 3970 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO); 3971 3972 /* 3973 * We don't support the ATA "security" protocol. 3974 */ 3975 if (secp == 0xef) { 3976 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0); 3977 return 1; 3978 } 3979 3980 if (cdb[4] & 7) { /* INC_512 */ 3981 if (len > 0xffff) { 3982 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3983 return 1; 3984 } 3985 } else { 3986 if (len > 0x01fffe00) { 3987 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 3988 return 1; 3989 } 3990 3991 /* convert to the sector-based ATA addressing */ 3992 len = (len + 511) / 512; 3993 } 3994 3995 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO; 3996 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA; 3997 if (send) 3998 tf->flags |= ATA_TFLAG_WRITE; 3999 tf->command = ata_scsi_trusted_op(len, send, dma); 4000 tf->feature = secp; 4001 tf->lbam = spsp & 0xff; 4002 tf->lbah = spsp >> 8; 4003 4004 if (len) { 4005 tf->nsect = len & 0xff; 4006 tf->lbal = len >> 8; 4007 } else { 4008 if (!send) 4009 tf->lbah = (1 << 7); 4010 } 4011 4012 ata_qc_set_pc_nbytes(qc); 4013 return 0; 4014 } 4015 4016 /** 4017 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler 4018 * @qc: Command to be translated 4019 * 4020 * Translate a SCSI variable length CDB to specified commands. 4021 * It checks a service action value in CDB to call corresponding handler. 4022 * 4023 * RETURNS: 4024 * Zero on success, non-zero on failure 4025 * 4026 */ 4027 static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc) 4028 { 4029 struct scsi_cmnd *scmd = qc->scsicmd; 4030 const u8 *cdb = scmd->cmnd; 4031 const u16 sa = get_unaligned_be16(&cdb[8]); 4032 4033 /* 4034 * if service action represents a ata pass-thru(32) command, 4035 * then pass it to ata_scsi_pass_thru handler. 4036 */ 4037 if (sa == ATA_32) 4038 return ata_scsi_pass_thru(qc); 4039 4040 /* unsupported service action */ 4041 return 1; 4042 } 4043 4044 /** 4045 * ata_get_xlat_func - check if SCSI to ATA translation is possible 4046 * @dev: ATA device 4047 * @cmd: SCSI command opcode to consider 4048 * 4049 * Look up the SCSI command given, and determine whether the 4050 * SCSI command is to be translated or simulated. 4051 * 4052 * RETURNS: 4053 * Pointer to translation function if possible, %NULL if not. 4054 */ 4055 4056 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 4057 { 4058 switch (cmd) { 4059 case READ_6: 4060 case READ_10: 4061 case READ_16: 4062 4063 case WRITE_6: 4064 case WRITE_10: 4065 case WRITE_16: 4066 return ata_scsi_rw_xlat; 4067 4068 case WRITE_SAME_16: 4069 return ata_scsi_write_same_xlat; 4070 4071 case SYNCHRONIZE_CACHE: 4072 case SYNCHRONIZE_CACHE_16: 4073 if (ata_try_flush_cache(dev)) 4074 return ata_scsi_flush_xlat; 4075 break; 4076 4077 case VERIFY: 4078 case VERIFY_16: 4079 return ata_scsi_verify_xlat; 4080 4081 case ATA_12: 4082 case ATA_16: 4083 return ata_scsi_pass_thru; 4084 4085 case VARIABLE_LENGTH_CMD: 4086 return ata_scsi_var_len_cdb_xlat; 4087 4088 case MODE_SELECT: 4089 case MODE_SELECT_10: 4090 return ata_scsi_mode_select_xlat; 4091 4092 case ZBC_IN: 4093 return ata_scsi_zbc_in_xlat; 4094 4095 case ZBC_OUT: 4096 return ata_scsi_zbc_out_xlat; 4097 4098 case SECURITY_PROTOCOL_IN: 4099 case SECURITY_PROTOCOL_OUT: 4100 if (!(dev->flags & ATA_DFLAG_TRUSTED)) 4101 break; 4102 return ata_scsi_security_inout_xlat; 4103 4104 case START_STOP: 4105 return ata_scsi_start_stop_xlat; 4106 } 4107 4108 return NULL; 4109 } 4110 4111 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev) 4112 { 4113 struct ata_port *ap = dev->link->ap; 4114 u8 scsi_op = scmd->cmnd[0]; 4115 ata_xlat_func_t xlat_func; 4116 4117 /* 4118 * scsi_queue_rq() will defer commands if scsi_host_in_recovery(). 4119 * However, this check is done without holding the ap->lock (a libata 4120 * specific lock), so we can have received an error irq since then, 4121 * therefore we must check if EH is pending, while holding ap->lock. 4122 */ 4123 if (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) 4124 return SCSI_MLQUEUE_DEVICE_BUSY; 4125 4126 if (unlikely(!scmd->cmd_len)) 4127 goto bad_cdb_len; 4128 4129 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 4130 if (unlikely(scmd->cmd_len > dev->cdb_len)) 4131 goto bad_cdb_len; 4132 4133 xlat_func = ata_get_xlat_func(dev, scsi_op); 4134 } else if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 4135 /* relay SCSI command to ATAPI device */ 4136 int len = COMMAND_SIZE(scsi_op); 4137 4138 if (unlikely(len > scmd->cmd_len || 4139 len > dev->cdb_len || 4140 scmd->cmd_len > ATAPI_CDB_LEN)) 4141 goto bad_cdb_len; 4142 4143 xlat_func = atapi_xlat; 4144 } else { 4145 /* ATA_16 passthru, treat as an ATA command */ 4146 if (unlikely(scmd->cmd_len > 16)) 4147 goto bad_cdb_len; 4148 4149 xlat_func = ata_get_xlat_func(dev, scsi_op); 4150 } 4151 4152 if (xlat_func) 4153 return ata_scsi_translate(dev, scmd, xlat_func); 4154 4155 ata_scsi_simulate(dev, scmd); 4156 4157 return 0; 4158 4159 bad_cdb_len: 4160 scmd->result = DID_ERROR << 16; 4161 scsi_done(scmd); 4162 return 0; 4163 } 4164 4165 /** 4166 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 4167 * @shost: SCSI host of command to be sent 4168 * @cmd: SCSI command to be sent 4169 * 4170 * In some cases, this function translates SCSI commands into 4171 * ATA taskfiles, and queues the taskfiles to be sent to 4172 * hardware. In other cases, this function simulates a 4173 * SCSI device by evaluating and responding to certain 4174 * SCSI commands. This creates the overall effect of 4175 * ATA and ATAPI devices appearing as SCSI devices. 4176 * 4177 * LOCKING: 4178 * ATA host lock 4179 * 4180 * RETURNS: 4181 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4182 * 0 otherwise. 4183 */ 4184 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 4185 { 4186 struct ata_port *ap; 4187 struct ata_device *dev; 4188 struct scsi_device *scsidev = cmd->device; 4189 int rc = 0; 4190 unsigned long irq_flags; 4191 4192 ap = ata_shost_to_port(shost); 4193 4194 spin_lock_irqsave(ap->lock, irq_flags); 4195 4196 dev = ata_scsi_find_dev(ap, scsidev); 4197 if (likely(dev)) 4198 rc = __ata_scsi_queuecmd(cmd, dev); 4199 else { 4200 cmd->result = (DID_BAD_TARGET << 16); 4201 scsi_done(cmd); 4202 } 4203 4204 spin_unlock_irqrestore(ap->lock, irq_flags); 4205 4206 return rc; 4207 } 4208 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd); 4209 4210 /** 4211 * ata_scsi_simulate - simulate SCSI command on ATA device 4212 * @dev: the target device 4213 * @cmd: SCSI command being sent to device. 4214 * 4215 * Interprets and directly executes a select list of SCSI commands 4216 * that can be handled internally. 4217 * 4218 * LOCKING: 4219 * spin_lock_irqsave(host lock) 4220 */ 4221 4222 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 4223 { 4224 struct ata_scsi_args args; 4225 const u8 *scsicmd = cmd->cmnd; 4226 u8 tmp8; 4227 4228 args.dev = dev; 4229 args.id = dev->id; 4230 args.cmd = cmd; 4231 4232 switch(scsicmd[0]) { 4233 case INQUIRY: 4234 if (scsicmd[1] & 2) /* is CmdDt set? */ 4235 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4236 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 4237 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 4238 else switch (scsicmd[2]) { 4239 case 0x00: 4240 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 4241 break; 4242 case 0x80: 4243 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 4244 break; 4245 case 0x83: 4246 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 4247 break; 4248 case 0x89: 4249 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 4250 break; 4251 case 0xb0: 4252 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 4253 break; 4254 case 0xb1: 4255 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 4256 break; 4257 case 0xb2: 4258 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 4259 break; 4260 case 0xb6: 4261 if (dev->flags & ATA_DFLAG_ZAC) 4262 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6); 4263 else 4264 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4265 break; 4266 case 0xb9: 4267 if (dev->cpr_log) 4268 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b9); 4269 else 4270 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4271 break; 4272 default: 4273 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4274 break; 4275 } 4276 break; 4277 4278 case MODE_SENSE: 4279 case MODE_SENSE_10: 4280 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 4281 break; 4282 4283 case READ_CAPACITY: 4284 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4285 break; 4286 4287 case SERVICE_ACTION_IN_16: 4288 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 4289 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4290 else 4291 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4292 break; 4293 4294 case REPORT_LUNS: 4295 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 4296 break; 4297 4298 case REQUEST_SENSE: 4299 ata_scsi_set_sense(dev, cmd, 0, 0, 0); 4300 break; 4301 4302 /* if we reach this, then writeback caching is disabled, 4303 * turning this into a no-op. 4304 */ 4305 case SYNCHRONIZE_CACHE: 4306 case SYNCHRONIZE_CACHE_16: 4307 fallthrough; 4308 4309 /* no-op's, complete with success */ 4310 case REZERO_UNIT: 4311 case SEEK_6: 4312 case SEEK_10: 4313 case TEST_UNIT_READY: 4314 break; 4315 4316 case SEND_DIAGNOSTIC: 4317 tmp8 = scsicmd[1] & ~(1 << 3); 4318 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4]) 4319 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4320 break; 4321 4322 case MAINTENANCE_IN: 4323 if ((scsicmd[1] & 0x1f) == MI_REPORT_SUPPORTED_OPERATION_CODES) 4324 ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in); 4325 else 4326 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4327 break; 4328 4329 /* all other commands */ 4330 default: 4331 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0); 4332 /* "Invalid command operation code" */ 4333 break; 4334 } 4335 4336 scsi_done(cmd); 4337 } 4338 4339 int ata_scsi_add_hosts(struct ata_host *host, const struct scsi_host_template *sht) 4340 { 4341 int i, rc; 4342 4343 for (i = 0; i < host->n_ports; i++) { 4344 struct ata_port *ap = host->ports[i]; 4345 struct Scsi_Host *shost; 4346 4347 rc = -ENOMEM; 4348 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 4349 if (!shost) 4350 goto err_alloc; 4351 4352 shost->eh_noresume = 1; 4353 *(struct ata_port **)&shost->hostdata[0] = ap; 4354 ap->scsi_host = shost; 4355 4356 shost->transportt = ata_scsi_transport_template; 4357 shost->unique_id = ap->print_id; 4358 shost->max_id = 16; 4359 shost->max_lun = 1; 4360 shost->max_channel = 1; 4361 shost->max_cmd_len = 32; 4362 4363 /* Schedule policy is determined by ->qc_defer() 4364 * callback and it needs to see every deferred qc. 4365 * Set host_blocked to 1 to prevent SCSI midlayer from 4366 * automatically deferring requests. 4367 */ 4368 shost->max_host_blocked = 1; 4369 4370 rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev); 4371 if (rc) 4372 goto err_alloc; 4373 } 4374 4375 return 0; 4376 4377 err_alloc: 4378 while (--i >= 0) { 4379 struct Scsi_Host *shost = host->ports[i]->scsi_host; 4380 4381 /* scsi_host_put() is in ata_devres_release() */ 4382 scsi_remove_host(shost); 4383 } 4384 return rc; 4385 } 4386 4387 #ifdef CONFIG_OF 4388 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4389 { 4390 struct scsi_device *sdev = dev->sdev; 4391 struct device *d = ap->host->dev; 4392 struct device_node *np = d->of_node; 4393 struct device_node *child; 4394 4395 for_each_available_child_of_node(np, child) { 4396 int ret; 4397 u32 val; 4398 4399 ret = of_property_read_u32(child, "reg", &val); 4400 if (ret) 4401 continue; 4402 if (val == dev->devno) { 4403 dev_dbg(d, "found matching device node\n"); 4404 sdev->sdev_gendev.of_node = child; 4405 return; 4406 } 4407 } 4408 } 4409 #else 4410 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) 4411 { 4412 } 4413 #endif 4414 4415 void ata_scsi_scan_host(struct ata_port *ap, int sync) 4416 { 4417 int tries = 5; 4418 struct ata_device *last_failed_dev = NULL; 4419 struct ata_link *link; 4420 struct ata_device *dev; 4421 4422 repeat: 4423 ata_for_each_link(link, ap, EDGE) { 4424 ata_for_each_dev(dev, link, ENABLED) { 4425 struct scsi_device *sdev; 4426 int channel = 0, id = 0; 4427 4428 if (dev->sdev) 4429 continue; 4430 4431 if (ata_is_host_link(link)) 4432 id = dev->devno; 4433 else 4434 channel = link->pmp; 4435 4436 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 4437 NULL); 4438 if (!IS_ERR(sdev)) { 4439 dev->sdev = sdev; 4440 ata_scsi_assign_ofnode(dev, ap); 4441 scsi_device_put(sdev); 4442 } else { 4443 dev->sdev = NULL; 4444 } 4445 } 4446 } 4447 4448 /* If we scanned while EH was in progress or allocation 4449 * failure occurred, scan would have failed silently. Check 4450 * whether all devices are attached. 4451 */ 4452 ata_for_each_link(link, ap, EDGE) { 4453 ata_for_each_dev(dev, link, ENABLED) { 4454 if (!dev->sdev) 4455 goto exit_loop; 4456 } 4457 } 4458 exit_loop: 4459 if (!link) 4460 return; 4461 4462 /* we're missing some SCSI devices */ 4463 if (sync) { 4464 /* If caller requested synchrnous scan && we've made 4465 * any progress, sleep briefly and repeat. 4466 */ 4467 if (dev != last_failed_dev) { 4468 msleep(100); 4469 last_failed_dev = dev; 4470 goto repeat; 4471 } 4472 4473 /* We might be failing to detect boot device, give it 4474 * a few more chances. 4475 */ 4476 if (--tries) { 4477 msleep(100); 4478 goto repeat; 4479 } 4480 4481 ata_port_err(ap, 4482 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 4483 } 4484 4485 queue_delayed_work(system_long_wq, &ap->hotplug_task, 4486 round_jiffies_relative(HZ)); 4487 } 4488 4489 /** 4490 * ata_scsi_offline_dev - offline attached SCSI device 4491 * @dev: ATA device to offline attached SCSI device for 4492 * 4493 * This function is called from ata_eh_hotplug() and responsible 4494 * for taking the SCSI device attached to @dev offline. This 4495 * function is called with host lock which protects dev->sdev 4496 * against clearing. 4497 * 4498 * LOCKING: 4499 * spin_lock_irqsave(host lock) 4500 * 4501 * RETURNS: 4502 * 1 if attached SCSI device exists, 0 otherwise. 4503 */ 4504 int ata_scsi_offline_dev(struct ata_device *dev) 4505 { 4506 if (dev->sdev) { 4507 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 4508 return 1; 4509 } 4510 return 0; 4511 } 4512 4513 /** 4514 * ata_scsi_remove_dev - remove attached SCSI device 4515 * @dev: ATA device to remove attached SCSI device for 4516 * 4517 * This function is called from ata_eh_scsi_hotplug() and 4518 * responsible for removing the SCSI device attached to @dev. 4519 * 4520 * LOCKING: 4521 * Kernel thread context (may sleep). 4522 */ 4523 static void ata_scsi_remove_dev(struct ata_device *dev) 4524 { 4525 struct ata_port *ap = dev->link->ap; 4526 struct scsi_device *sdev; 4527 unsigned long flags; 4528 4529 /* Alas, we need to grab scan_mutex to ensure SCSI device 4530 * state doesn't change underneath us and thus 4531 * scsi_device_get() always succeeds. The mutex locking can 4532 * be removed if there is __scsi_device_get() interface which 4533 * increments reference counts regardless of device state. 4534 */ 4535 mutex_lock(&ap->scsi_host->scan_mutex); 4536 spin_lock_irqsave(ap->lock, flags); 4537 4538 /* clearing dev->sdev is protected by host lock */ 4539 sdev = dev->sdev; 4540 dev->sdev = NULL; 4541 4542 if (sdev) { 4543 /* If user initiated unplug races with us, sdev can go 4544 * away underneath us after the host lock and 4545 * scan_mutex are released. Hold onto it. 4546 */ 4547 if (scsi_device_get(sdev) == 0) { 4548 /* The following ensures the attached sdev is 4549 * offline on return from ata_scsi_offline_dev() 4550 * regardless it wins or loses the race 4551 * against this function. 4552 */ 4553 scsi_device_set_state(sdev, SDEV_OFFLINE); 4554 } else { 4555 WARN_ON(1); 4556 sdev = NULL; 4557 } 4558 } 4559 4560 spin_unlock_irqrestore(ap->lock, flags); 4561 mutex_unlock(&ap->scsi_host->scan_mutex); 4562 4563 if (sdev) { 4564 ata_dev_info(dev, "detaching (SCSI %s)\n", 4565 dev_name(&sdev->sdev_gendev)); 4566 4567 scsi_remove_device(sdev); 4568 scsi_device_put(sdev); 4569 } 4570 } 4571 4572 static void ata_scsi_handle_link_detach(struct ata_link *link) 4573 { 4574 struct ata_port *ap = link->ap; 4575 struct ata_device *dev; 4576 4577 ata_for_each_dev(dev, link, ALL) { 4578 unsigned long flags; 4579 4580 if (!(dev->flags & ATA_DFLAG_DETACHED)) 4581 continue; 4582 4583 spin_lock_irqsave(ap->lock, flags); 4584 dev->flags &= ~ATA_DFLAG_DETACHED; 4585 spin_unlock_irqrestore(ap->lock, flags); 4586 4587 if (zpodd_dev_enabled(dev)) 4588 zpodd_exit(dev); 4589 4590 ata_scsi_remove_dev(dev); 4591 } 4592 } 4593 4594 /** 4595 * ata_scsi_media_change_notify - send media change event 4596 * @dev: Pointer to the disk device with media change event 4597 * 4598 * Tell the block layer to send a media change notification 4599 * event. 4600 * 4601 * LOCKING: 4602 * spin_lock_irqsave(host lock) 4603 */ 4604 void ata_scsi_media_change_notify(struct ata_device *dev) 4605 { 4606 if (dev->sdev) 4607 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 4608 GFP_ATOMIC); 4609 } 4610 4611 /** 4612 * ata_scsi_hotplug - SCSI part of hotplug 4613 * @work: Pointer to ATA port to perform SCSI hotplug on 4614 * 4615 * Perform SCSI part of hotplug. It's executed from a separate 4616 * workqueue after EH completes. This is necessary because SCSI 4617 * hot plugging requires working EH and hot unplugging is 4618 * synchronized with hot plugging with a mutex. 4619 * 4620 * LOCKING: 4621 * Kernel thread context (may sleep). 4622 */ 4623 void ata_scsi_hotplug(struct work_struct *work) 4624 { 4625 struct ata_port *ap = 4626 container_of(work, struct ata_port, hotplug_task.work); 4627 int i; 4628 4629 if (ap->pflags & ATA_PFLAG_UNLOADING) 4630 return; 4631 4632 mutex_lock(&ap->scsi_scan_mutex); 4633 4634 /* Unplug detached devices. We cannot use link iterator here 4635 * because PMP links have to be scanned even if PMP is 4636 * currently not attached. Iterate manually. 4637 */ 4638 ata_scsi_handle_link_detach(&ap->link); 4639 if (ap->pmp_link) 4640 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 4641 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 4642 4643 /* scan for new ones */ 4644 ata_scsi_scan_host(ap, 0); 4645 4646 mutex_unlock(&ap->scsi_scan_mutex); 4647 } 4648 4649 /** 4650 * ata_scsi_user_scan - indication for user-initiated bus scan 4651 * @shost: SCSI host to scan 4652 * @channel: Channel to scan 4653 * @id: ID to scan 4654 * @lun: LUN to scan 4655 * 4656 * This function is called when user explicitly requests bus 4657 * scan. Set probe pending flag and invoke EH. 4658 * 4659 * LOCKING: 4660 * SCSI layer (we don't care) 4661 * 4662 * RETURNS: 4663 * Zero. 4664 */ 4665 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 4666 unsigned int id, u64 lun) 4667 { 4668 struct ata_port *ap = ata_shost_to_port(shost); 4669 unsigned long flags; 4670 int devno, rc = 0; 4671 4672 if (lun != SCAN_WILD_CARD && lun) 4673 return -EINVAL; 4674 4675 if (!sata_pmp_attached(ap)) { 4676 if (channel != SCAN_WILD_CARD && channel) 4677 return -EINVAL; 4678 devno = id; 4679 } else { 4680 if (id != SCAN_WILD_CARD && id) 4681 return -EINVAL; 4682 devno = channel; 4683 } 4684 4685 spin_lock_irqsave(ap->lock, flags); 4686 4687 if (devno == SCAN_WILD_CARD) { 4688 struct ata_link *link; 4689 4690 ata_for_each_link(link, ap, EDGE) { 4691 struct ata_eh_info *ehi = &link->eh_info; 4692 ehi->probe_mask |= ATA_ALL_DEVICES; 4693 ehi->action |= ATA_EH_RESET; 4694 } 4695 } else { 4696 struct ata_device *dev = ata_find_dev(ap, devno); 4697 4698 if (dev) { 4699 struct ata_eh_info *ehi = &dev->link->eh_info; 4700 ehi->probe_mask |= 1 << dev->devno; 4701 ehi->action |= ATA_EH_RESET; 4702 } else 4703 rc = -EINVAL; 4704 } 4705 4706 if (rc == 0) { 4707 ata_port_schedule_eh(ap); 4708 spin_unlock_irqrestore(ap->lock, flags); 4709 ata_port_wait_eh(ap); 4710 } else 4711 spin_unlock_irqrestore(ap->lock, flags); 4712 4713 return rc; 4714 } 4715 4716 /** 4717 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4718 * @work: Pointer to ATA port to perform scsi_rescan_device() 4719 * 4720 * After ATA pass thru (SAT) commands are executed successfully, 4721 * libata need to propagate the changes to SCSI layer. 4722 * 4723 * LOCKING: 4724 * Kernel thread context (may sleep). 4725 */ 4726 void ata_scsi_dev_rescan(struct work_struct *work) 4727 { 4728 struct ata_port *ap = 4729 container_of(work, struct ata_port, scsi_rescan_task.work); 4730 struct ata_link *link; 4731 struct ata_device *dev; 4732 unsigned long flags; 4733 bool do_resume; 4734 int ret = 0; 4735 4736 mutex_lock(&ap->scsi_scan_mutex); 4737 spin_lock_irqsave(ap->lock, flags); 4738 4739 ata_for_each_link(link, ap, EDGE) { 4740 ata_for_each_dev(dev, link, ENABLED) { 4741 struct scsi_device *sdev = dev->sdev; 4742 4743 /* 4744 * If the port was suspended before this was scheduled, 4745 * bail out. 4746 */ 4747 if (ap->pflags & ATA_PFLAG_SUSPENDED) 4748 goto unlock; 4749 4750 if (!sdev) 4751 continue; 4752 if (scsi_device_get(sdev)) 4753 continue; 4754 4755 do_resume = dev->flags & ATA_DFLAG_RESUMING; 4756 4757 spin_unlock_irqrestore(ap->lock, flags); 4758 if (do_resume) { 4759 ret = scsi_resume_device(sdev); 4760 if (ret == -EWOULDBLOCK) 4761 goto unlock; 4762 dev->flags &= ~ATA_DFLAG_RESUMING; 4763 } 4764 ret = scsi_rescan_device(sdev); 4765 scsi_device_put(sdev); 4766 spin_lock_irqsave(ap->lock, flags); 4767 4768 if (ret) 4769 goto unlock; 4770 } 4771 } 4772 4773 unlock: 4774 spin_unlock_irqrestore(ap->lock, flags); 4775 mutex_unlock(&ap->scsi_scan_mutex); 4776 4777 /* Reschedule with a delay if scsi_rescan_device() returned an error */ 4778 if (ret) 4779 schedule_delayed_work(&ap->scsi_rescan_task, 4780 msecs_to_jiffies(5)); 4781 } 4782