1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Tejun Heo <tj@kernel.org> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/driver-api/libata.rst 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <linux/export.h> 41 #include <scsi/scsi.h> 42 #include <scsi/scsi_host.h> 43 #include <scsi/scsi_cmnd.h> 44 #include <scsi/scsi_eh.h> 45 #include <scsi/scsi_device.h> 46 #include <scsi/scsi_tcq.h> 47 #include <scsi/scsi_transport.h> 48 #include <linux/libata.h> 49 #include <linux/hdreg.h> 50 #include <linux/uaccess.h> 51 #include <linux/suspend.h> 52 #include <asm/unaligned.h> 53 #include <linux/ioprio.h> 54 55 #include "libata.h" 56 #include "libata-transport.h" 57 58 #define ATA_SCSI_RBUF_SIZE 4096 59 60 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 61 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 62 63 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 64 65 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 66 const struct scsi_device *scsidev); 67 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 68 const struct scsi_device *scsidev); 69 70 #define RW_RECOVERY_MPAGE 0x1 71 #define RW_RECOVERY_MPAGE_LEN 12 72 #define CACHE_MPAGE 0x8 73 #define CACHE_MPAGE_LEN 20 74 #define CONTROL_MPAGE 0xa 75 #define CONTROL_MPAGE_LEN 12 76 #define ALL_MPAGES 0x3f 77 #define ALL_SUB_MPAGES 0xff 78 79 80 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 81 RW_RECOVERY_MPAGE, 82 RW_RECOVERY_MPAGE_LEN - 2, 83 (1 << 7), /* AWRE */ 84 0, /* read retry count */ 85 0, 0, 0, 0, 86 0, /* write retry count */ 87 0, 0, 0 88 }; 89 90 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 91 CACHE_MPAGE, 92 CACHE_MPAGE_LEN - 2, 93 0, /* contains WCE, needs to be 0 for logic */ 94 0, 0, 0, 0, 0, 0, 0, 0, 0, 95 0, /* contains DRA, needs to be 0 for logic */ 96 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 100 CONTROL_MPAGE, 101 CONTROL_MPAGE_LEN - 2, 102 2, /* DSENSE=0, GLTSD=1 */ 103 0, /* [QAM+QERR may be 1, see 05-359r1] */ 104 0, 0, 0, 0, 0xff, 0xff, 105 0, 30 /* extended self test time, see 05-359r1 */ 106 }; 107 108 static const char *ata_lpm_policy_names[] = { 109 [ATA_LPM_UNKNOWN] = "max_performance", 110 [ATA_LPM_MAX_POWER] = "max_performance", 111 [ATA_LPM_MED_POWER] = "medium_power", 112 [ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm", 113 [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial", 114 [ATA_LPM_MIN_POWER] = "min_power", 115 }; 116 117 static ssize_t ata_scsi_lpm_store(struct device *device, 118 struct device_attribute *attr, 119 const char *buf, size_t count) 120 { 121 struct Scsi_Host *shost = class_to_shost(device); 122 struct ata_port *ap = ata_shost_to_port(shost); 123 struct ata_link *link; 124 struct ata_device *dev; 125 enum ata_lpm_policy policy; 126 unsigned long flags; 127 128 /* UNKNOWN is internal state, iterate from MAX_POWER */ 129 for (policy = ATA_LPM_MAX_POWER; 130 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 131 const char *name = ata_lpm_policy_names[policy]; 132 133 if (strncmp(name, buf, strlen(name)) == 0) 134 break; 135 } 136 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 137 return -EINVAL; 138 139 spin_lock_irqsave(ap->lock, flags); 140 141 ata_for_each_link(link, ap, EDGE) { 142 ata_for_each_dev(dev, &ap->link, ENABLED) { 143 if (dev->horkage & ATA_HORKAGE_NOLPM) { 144 count = -EOPNOTSUPP; 145 goto out_unlock; 146 } 147 } 148 } 149 150 ap->target_lpm_policy = policy; 151 ata_port_schedule_eh(ap); 152 out_unlock: 153 spin_unlock_irqrestore(ap->lock, flags); 154 return count; 155 } 156 157 static ssize_t ata_scsi_lpm_show(struct device *dev, 158 struct device_attribute *attr, char *buf) 159 { 160 struct Scsi_Host *shost = class_to_shost(dev); 161 struct ata_port *ap = ata_shost_to_port(shost); 162 163 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 164 return -EINVAL; 165 166 return snprintf(buf, PAGE_SIZE, "%s\n", 167 ata_lpm_policy_names[ap->target_lpm_policy]); 168 } 169 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 170 ata_scsi_lpm_show, ata_scsi_lpm_store); 171 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 172 173 static ssize_t ata_scsi_park_show(struct device *device, 174 struct device_attribute *attr, char *buf) 175 { 176 struct scsi_device *sdev = to_scsi_device(device); 177 struct ata_port *ap; 178 struct ata_link *link; 179 struct ata_device *dev; 180 unsigned long now; 181 unsigned int uninitialized_var(msecs); 182 int rc = 0; 183 184 ap = ata_shost_to_port(sdev->host); 185 186 spin_lock_irq(ap->lock); 187 dev = ata_scsi_find_dev(ap, sdev); 188 if (!dev) { 189 rc = -ENODEV; 190 goto unlock; 191 } 192 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 193 rc = -EOPNOTSUPP; 194 goto unlock; 195 } 196 197 link = dev->link; 198 now = jiffies; 199 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 200 link->eh_context.unloaded_mask & (1 << dev->devno) && 201 time_after(dev->unpark_deadline, now)) 202 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 203 else 204 msecs = 0; 205 206 unlock: 207 spin_unlock_irq(ap->lock); 208 209 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 210 } 211 212 static ssize_t ata_scsi_park_store(struct device *device, 213 struct device_attribute *attr, 214 const char *buf, size_t len) 215 { 216 struct scsi_device *sdev = to_scsi_device(device); 217 struct ata_port *ap; 218 struct ata_device *dev; 219 long int input; 220 unsigned long flags; 221 int rc; 222 223 rc = kstrtol(buf, 10, &input); 224 if (rc) 225 return rc; 226 if (input < -2) 227 return -EINVAL; 228 if (input > ATA_TMOUT_MAX_PARK) { 229 rc = -EOVERFLOW; 230 input = ATA_TMOUT_MAX_PARK; 231 } 232 233 ap = ata_shost_to_port(sdev->host); 234 235 spin_lock_irqsave(ap->lock, flags); 236 dev = ata_scsi_find_dev(ap, sdev); 237 if (unlikely(!dev)) { 238 rc = -ENODEV; 239 goto unlock; 240 } 241 if (dev->class != ATA_DEV_ATA && 242 dev->class != ATA_DEV_ZAC) { 243 rc = -EOPNOTSUPP; 244 goto unlock; 245 } 246 247 if (input >= 0) { 248 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 249 rc = -EOPNOTSUPP; 250 goto unlock; 251 } 252 253 dev->unpark_deadline = ata_deadline(jiffies, input); 254 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 255 ata_port_schedule_eh(ap); 256 complete(&ap->park_req_pending); 257 } else { 258 switch (input) { 259 case -1: 260 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 261 break; 262 case -2: 263 dev->flags |= ATA_DFLAG_NO_UNLOAD; 264 break; 265 } 266 } 267 unlock: 268 spin_unlock_irqrestore(ap->lock, flags); 269 270 return rc ? rc : len; 271 } 272 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 273 ata_scsi_park_show, ata_scsi_park_store); 274 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 275 276 static ssize_t ata_ncq_prio_enable_show(struct device *device, 277 struct device_attribute *attr, 278 char *buf) 279 { 280 struct scsi_device *sdev = to_scsi_device(device); 281 struct ata_port *ap; 282 struct ata_device *dev; 283 bool ncq_prio_enable; 284 int rc = 0; 285 286 ap = ata_shost_to_port(sdev->host); 287 288 spin_lock_irq(ap->lock); 289 dev = ata_scsi_find_dev(ap, sdev); 290 if (!dev) { 291 rc = -ENODEV; 292 goto unlock; 293 } 294 295 ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE; 296 297 unlock: 298 spin_unlock_irq(ap->lock); 299 300 return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable); 301 } 302 303 static ssize_t ata_ncq_prio_enable_store(struct device *device, 304 struct device_attribute *attr, 305 const char *buf, size_t len) 306 { 307 struct scsi_device *sdev = to_scsi_device(device); 308 struct ata_port *ap; 309 struct ata_device *dev; 310 long int input; 311 int rc; 312 313 rc = kstrtol(buf, 10, &input); 314 if (rc) 315 return rc; 316 if ((input < 0) || (input > 1)) 317 return -EINVAL; 318 319 ap = ata_shost_to_port(sdev->host); 320 dev = ata_scsi_find_dev(ap, sdev); 321 if (unlikely(!dev)) 322 return -ENODEV; 323 324 spin_lock_irq(ap->lock); 325 if (input) 326 dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE; 327 else 328 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE; 329 330 dev->link->eh_info.action |= ATA_EH_REVALIDATE; 331 dev->link->eh_info.flags |= ATA_EHI_QUIET; 332 ata_port_schedule_eh(ap); 333 spin_unlock_irq(ap->lock); 334 335 ata_port_wait_eh(ap); 336 337 if (input) { 338 spin_lock_irq(ap->lock); 339 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) { 340 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE; 341 rc = -EIO; 342 } 343 spin_unlock_irq(ap->lock); 344 } 345 346 return rc ? rc : len; 347 } 348 349 DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR, 350 ata_ncq_prio_enable_show, ata_ncq_prio_enable_store); 351 EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable); 352 353 void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd, 354 u8 sk, u8 asc, u8 ascq) 355 { 356 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 357 358 if (!cmd) 359 return; 360 361 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 362 363 scsi_build_sense_buffer(d_sense, cmd->sense_buffer, sk, asc, ascq); 364 } 365 366 void ata_scsi_set_sense_information(struct ata_device *dev, 367 struct scsi_cmnd *cmd, 368 const struct ata_taskfile *tf) 369 { 370 u64 information; 371 372 if (!cmd) 373 return; 374 375 information = ata_tf_read_block(tf, dev); 376 if (information == U64_MAX) 377 return; 378 379 scsi_set_sense_information(cmd->sense_buffer, 380 SCSI_SENSE_BUFFERSIZE, information); 381 } 382 383 static void ata_scsi_set_invalid_field(struct ata_device *dev, 384 struct scsi_cmnd *cmd, u16 field, u8 bit) 385 { 386 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0); 387 /* "Invalid field in CDB" */ 388 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 389 field, bit, 1); 390 } 391 392 static void ata_scsi_set_invalid_parameter(struct ata_device *dev, 393 struct scsi_cmnd *cmd, u16 field) 394 { 395 /* "Invalid field in parameter list" */ 396 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0); 397 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, 398 field, 0xff, 0); 399 } 400 401 static ssize_t 402 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 403 const char *buf, size_t count) 404 { 405 struct Scsi_Host *shost = class_to_shost(dev); 406 struct ata_port *ap = ata_shost_to_port(shost); 407 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 408 return ap->ops->em_store(ap, buf, count); 409 return -EINVAL; 410 } 411 412 static ssize_t 413 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 414 char *buf) 415 { 416 struct Scsi_Host *shost = class_to_shost(dev); 417 struct ata_port *ap = ata_shost_to_port(shost); 418 419 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 420 return ap->ops->em_show(ap, buf); 421 return -EINVAL; 422 } 423 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 424 ata_scsi_em_message_show, ata_scsi_em_message_store); 425 EXPORT_SYMBOL_GPL(dev_attr_em_message); 426 427 static ssize_t 428 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 429 char *buf) 430 { 431 struct Scsi_Host *shost = class_to_shost(dev); 432 struct ata_port *ap = ata_shost_to_port(shost); 433 434 return snprintf(buf, 23, "%d\n", ap->em_message_type); 435 } 436 DEVICE_ATTR(em_message_type, S_IRUGO, 437 ata_scsi_em_message_type_show, NULL); 438 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 439 440 static ssize_t 441 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 442 char *buf) 443 { 444 struct scsi_device *sdev = to_scsi_device(dev); 445 struct ata_port *ap = ata_shost_to_port(sdev->host); 446 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 447 448 if (atadev && ap->ops->sw_activity_show && 449 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 450 return ap->ops->sw_activity_show(atadev, buf); 451 return -EINVAL; 452 } 453 454 static ssize_t 455 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 456 const char *buf, size_t count) 457 { 458 struct scsi_device *sdev = to_scsi_device(dev); 459 struct ata_port *ap = ata_shost_to_port(sdev->host); 460 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 461 enum sw_activity val; 462 int rc; 463 464 if (atadev && ap->ops->sw_activity_store && 465 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 466 val = simple_strtoul(buf, NULL, 0); 467 switch (val) { 468 case OFF: case BLINK_ON: case BLINK_OFF: 469 rc = ap->ops->sw_activity_store(atadev, val); 470 if (!rc) 471 return count; 472 else 473 return rc; 474 } 475 } 476 return -EINVAL; 477 } 478 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 479 ata_scsi_activity_store); 480 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 481 482 struct device_attribute *ata_common_sdev_attrs[] = { 483 &dev_attr_unload_heads, 484 &dev_attr_ncq_prio_enable, 485 NULL 486 }; 487 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 488 489 /** 490 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 491 * @sdev: SCSI device for which BIOS geometry is to be determined 492 * @bdev: block device associated with @sdev 493 * @capacity: capacity of SCSI device 494 * @geom: location to which geometry will be output 495 * 496 * Generic bios head/sector/cylinder calculator 497 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 498 * mapping. Some situations may arise where the disk is not 499 * bootable if this is not used. 500 * 501 * LOCKING: 502 * Defined by the SCSI layer. We don't really care. 503 * 504 * RETURNS: 505 * Zero. 506 */ 507 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 508 sector_t capacity, int geom[]) 509 { 510 geom[0] = 255; 511 geom[1] = 63; 512 sector_div(capacity, 255*63); 513 geom[2] = capacity; 514 515 return 0; 516 } 517 518 /** 519 * ata_scsi_unlock_native_capacity - unlock native capacity 520 * @sdev: SCSI device to adjust device capacity for 521 * 522 * This function is called if a partition on @sdev extends beyond 523 * the end of the device. It requests EH to unlock HPA. 524 * 525 * LOCKING: 526 * Defined by the SCSI layer. Might sleep. 527 */ 528 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 529 { 530 struct ata_port *ap = ata_shost_to_port(sdev->host); 531 struct ata_device *dev; 532 unsigned long flags; 533 534 spin_lock_irqsave(ap->lock, flags); 535 536 dev = ata_scsi_find_dev(ap, sdev); 537 if (dev && dev->n_sectors < dev->n_native_sectors) { 538 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 539 dev->link->eh_info.action |= ATA_EH_RESET; 540 ata_port_schedule_eh(ap); 541 } 542 543 spin_unlock_irqrestore(ap->lock, flags); 544 ata_port_wait_eh(ap); 545 } 546 547 /** 548 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 549 * @ap: target port 550 * @sdev: SCSI device to get identify data for 551 * @arg: User buffer area for identify data 552 * 553 * LOCKING: 554 * Defined by the SCSI layer. We don't really care. 555 * 556 * RETURNS: 557 * Zero on success, negative errno on error. 558 */ 559 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 560 void __user *arg) 561 { 562 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 563 u16 __user *dst = arg; 564 char buf[40]; 565 566 if (!dev) 567 return -ENOMSG; 568 569 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 570 return -EFAULT; 571 572 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 573 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 574 return -EFAULT; 575 576 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 577 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 578 return -EFAULT; 579 580 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 581 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 582 return -EFAULT; 583 584 return 0; 585 } 586 587 /** 588 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 589 * @scsidev: Device to which we are issuing command 590 * @arg: User provided data for issuing command 591 * 592 * LOCKING: 593 * Defined by the SCSI layer. We don't really care. 594 * 595 * RETURNS: 596 * Zero on success, negative errno on error. 597 */ 598 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 599 { 600 int rc = 0; 601 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 602 u8 scsi_cmd[MAX_COMMAND_SIZE]; 603 u8 args[4], *argbuf = NULL; 604 int argsize = 0; 605 enum dma_data_direction data_dir; 606 struct scsi_sense_hdr sshdr; 607 int cmd_result; 608 609 if (arg == NULL) 610 return -EINVAL; 611 612 if (copy_from_user(args, arg, sizeof(args))) 613 return -EFAULT; 614 615 memset(sensebuf, 0, sizeof(sensebuf)); 616 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 617 618 if (args[3]) { 619 argsize = ATA_SECT_SIZE * args[3]; 620 argbuf = kmalloc(argsize, GFP_KERNEL); 621 if (argbuf == NULL) { 622 rc = -ENOMEM; 623 goto error; 624 } 625 626 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 627 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 628 block count in sector count field */ 629 data_dir = DMA_FROM_DEVICE; 630 } else { 631 scsi_cmd[1] = (3 << 1); /* Non-data */ 632 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 633 data_dir = DMA_NONE; 634 } 635 636 scsi_cmd[0] = ATA_16; 637 638 scsi_cmd[4] = args[2]; 639 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 640 scsi_cmd[6] = args[3]; 641 scsi_cmd[8] = args[1]; 642 scsi_cmd[10] = 0x4f; 643 scsi_cmd[12] = 0xc2; 644 } else { 645 scsi_cmd[6] = args[1]; 646 } 647 scsi_cmd[14] = args[0]; 648 649 /* Good values for timeout and retries? Values below 650 from scsi_ioctl_send_command() for default case... */ 651 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 652 sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL); 653 654 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 655 u8 *desc = sensebuf + 8; 656 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 657 658 /* If we set cc then ATA pass-through will cause a 659 * check condition even if no error. Filter that. */ 660 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 661 if (sshdr.sense_key == RECOVERED_ERROR && 662 sshdr.asc == 0 && sshdr.ascq == 0x1d) 663 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 664 } 665 666 /* Send userspace a few ATA registers (same as drivers/ide) */ 667 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 668 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 669 args[0] = desc[13]; /* status */ 670 args[1] = desc[3]; /* error */ 671 args[2] = desc[5]; /* sector count (0:7) */ 672 if (copy_to_user(arg, args, sizeof(args))) 673 rc = -EFAULT; 674 } 675 } 676 677 678 if (cmd_result) { 679 rc = -EIO; 680 goto error; 681 } 682 683 if ((argbuf) 684 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 685 rc = -EFAULT; 686 error: 687 kfree(argbuf); 688 return rc; 689 } 690 691 /** 692 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 693 * @scsidev: Device to which we are issuing command 694 * @arg: User provided data for issuing command 695 * 696 * LOCKING: 697 * Defined by the SCSI layer. We don't really care. 698 * 699 * RETURNS: 700 * Zero on success, negative errno on error. 701 */ 702 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 703 { 704 int rc = 0; 705 u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; 706 u8 scsi_cmd[MAX_COMMAND_SIZE]; 707 u8 args[7]; 708 struct scsi_sense_hdr sshdr; 709 int cmd_result; 710 711 if (arg == NULL) 712 return -EINVAL; 713 714 if (copy_from_user(args, arg, sizeof(args))) 715 return -EFAULT; 716 717 memset(sensebuf, 0, sizeof(sensebuf)); 718 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 719 scsi_cmd[0] = ATA_16; 720 scsi_cmd[1] = (3 << 1); /* Non-data */ 721 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 722 scsi_cmd[4] = args[1]; 723 scsi_cmd[6] = args[2]; 724 scsi_cmd[8] = args[3]; 725 scsi_cmd[10] = args[4]; 726 scsi_cmd[12] = args[5]; 727 scsi_cmd[13] = args[6] & 0x4f; 728 scsi_cmd[14] = args[0]; 729 730 /* Good values for timeout and retries? Values below 731 from scsi_ioctl_send_command() for default case... */ 732 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 733 sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL); 734 735 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 736 u8 *desc = sensebuf + 8; 737 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 738 739 /* If we set cc then ATA pass-through will cause a 740 * check condition even if no error. Filter that. */ 741 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 742 if (sshdr.sense_key == RECOVERED_ERROR && 743 sshdr.asc == 0 && sshdr.ascq == 0x1d) 744 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 745 } 746 747 /* Send userspace ATA registers */ 748 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 749 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 750 args[0] = desc[13]; /* status */ 751 args[1] = desc[3]; /* error */ 752 args[2] = desc[5]; /* sector count (0:7) */ 753 args[3] = desc[7]; /* lbal */ 754 args[4] = desc[9]; /* lbam */ 755 args[5] = desc[11]; /* lbah */ 756 args[6] = desc[12]; /* select */ 757 if (copy_to_user(arg, args, sizeof(args))) 758 rc = -EFAULT; 759 } 760 } 761 762 if (cmd_result) { 763 rc = -EIO; 764 goto error; 765 } 766 767 error: 768 return rc; 769 } 770 771 static int ata_ioc32(struct ata_port *ap) 772 { 773 if (ap->flags & ATA_FLAG_PIO_DMA) 774 return 1; 775 if (ap->pflags & ATA_PFLAG_PIO32) 776 return 1; 777 return 0; 778 } 779 780 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 781 int cmd, void __user *arg) 782 { 783 unsigned long val; 784 int rc = -EINVAL; 785 unsigned long flags; 786 787 switch (cmd) { 788 case HDIO_GET_32BIT: 789 spin_lock_irqsave(ap->lock, flags); 790 val = ata_ioc32(ap); 791 spin_unlock_irqrestore(ap->lock, flags); 792 return put_user(val, (unsigned long __user *)arg); 793 794 case HDIO_SET_32BIT: 795 val = (unsigned long) arg; 796 rc = 0; 797 spin_lock_irqsave(ap->lock, flags); 798 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 799 if (val) 800 ap->pflags |= ATA_PFLAG_PIO32; 801 else 802 ap->pflags &= ~ATA_PFLAG_PIO32; 803 } else { 804 if (val != ata_ioc32(ap)) 805 rc = -EINVAL; 806 } 807 spin_unlock_irqrestore(ap->lock, flags); 808 return rc; 809 810 case HDIO_GET_IDENTITY: 811 return ata_get_identity(ap, scsidev, arg); 812 813 case HDIO_DRIVE_CMD: 814 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 815 return -EACCES; 816 return ata_cmd_ioctl(scsidev, arg); 817 818 case HDIO_DRIVE_TASK: 819 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 820 return -EACCES; 821 return ata_task_ioctl(scsidev, arg); 822 823 default: 824 rc = -ENOTTY; 825 break; 826 } 827 828 return rc; 829 } 830 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 831 832 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 833 { 834 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 835 scsidev, cmd, arg); 836 } 837 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 838 839 /** 840 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 841 * @dev: ATA device to which the new command is attached 842 * @cmd: SCSI command that originated this ATA command 843 * 844 * Obtain a reference to an unused ata_queued_cmd structure, 845 * which is the basic libata structure representing a single 846 * ATA command sent to the hardware. 847 * 848 * If a command was available, fill in the SCSI-specific 849 * portions of the structure with information on the 850 * current command. 851 * 852 * LOCKING: 853 * spin_lock_irqsave(host lock) 854 * 855 * RETURNS: 856 * Command allocated, or %NULL if none available. 857 */ 858 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 859 struct scsi_cmnd *cmd) 860 { 861 struct ata_queued_cmd *qc; 862 863 qc = ata_qc_new_init(dev, cmd->request->tag); 864 if (qc) { 865 qc->scsicmd = cmd; 866 qc->scsidone = cmd->scsi_done; 867 868 qc->sg = scsi_sglist(cmd); 869 qc->n_elem = scsi_sg_count(cmd); 870 871 if (cmd->request->rq_flags & RQF_QUIET) 872 qc->flags |= ATA_QCFLAG_QUIET; 873 } else { 874 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 875 cmd->scsi_done(cmd); 876 } 877 878 return qc; 879 } 880 881 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 882 { 883 struct scsi_cmnd *scmd = qc->scsicmd; 884 885 qc->extrabytes = scmd->request->extra_len; 886 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 887 } 888 889 /** 890 * ata_dump_status - user friendly display of error info 891 * @id: id of the port in question 892 * @tf: ptr to filled out taskfile 893 * 894 * Decode and dump the ATA error/status registers for the user so 895 * that they have some idea what really happened at the non 896 * make-believe layer. 897 * 898 * LOCKING: 899 * inherited from caller 900 */ 901 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 902 { 903 u8 stat = tf->command, err = tf->feature; 904 905 pr_warn("ata%u: status=0x%02x { ", id, stat); 906 if (stat & ATA_BUSY) { 907 pr_cont("Busy }\n"); /* Data is not valid in this case */ 908 } else { 909 if (stat & ATA_DRDY) pr_cont("DriveReady "); 910 if (stat & ATA_DF) pr_cont("DeviceFault "); 911 if (stat & ATA_DSC) pr_cont("SeekComplete "); 912 if (stat & ATA_DRQ) pr_cont("DataRequest "); 913 if (stat & ATA_CORR) pr_cont("CorrectedError "); 914 if (stat & ATA_SENSE) pr_cont("Sense "); 915 if (stat & ATA_ERR) pr_cont("Error "); 916 pr_cont("}\n"); 917 918 if (err) { 919 pr_warn("ata%u: error=0x%02x { ", id, err); 920 if (err & ATA_ABORTED) pr_cont("DriveStatusError "); 921 if (err & ATA_ICRC) { 922 if (err & ATA_ABORTED) 923 pr_cont("BadCRC "); 924 else pr_cont("Sector "); 925 } 926 if (err & ATA_UNC) pr_cont("UncorrectableError "); 927 if (err & ATA_IDNF) pr_cont("SectorIdNotFound "); 928 if (err & ATA_TRK0NF) pr_cont("TrackZeroNotFound "); 929 if (err & ATA_AMNF) pr_cont("AddrMarkNotFound "); 930 pr_cont("}\n"); 931 } 932 } 933 } 934 935 /** 936 * ata_to_sense_error - convert ATA error to SCSI error 937 * @id: ATA device number 938 * @drv_stat: value contained in ATA status register 939 * @drv_err: value contained in ATA error register 940 * @sk: the sense key we'll fill out 941 * @asc: the additional sense code we'll fill out 942 * @ascq: the additional sense code qualifier we'll fill out 943 * @verbose: be verbose 944 * 945 * Converts an ATA error into a SCSI error. Fill out pointers to 946 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 947 * format sense blocks. 948 * 949 * LOCKING: 950 * spin_lock_irqsave(host lock) 951 */ 952 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 953 u8 *asc, u8 *ascq, int verbose) 954 { 955 int i; 956 957 /* Based on the 3ware driver translation table */ 958 static const unsigned char sense_table[][4] = { 959 /* BBD|ECC|ID|MAR */ 960 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 961 // Device busy Aborted command 962 /* BBD|ECC|ID */ 963 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 964 // Device busy Aborted command 965 /* ECC|MC|MARK */ 966 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 967 // Device fault Hardware error 968 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 969 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 970 // Data CRC error SCSI parity error 971 /* MC|ID|ABRT|TRK0|MARK */ 972 {0x37, NOT_READY, 0x04, 0x00}, 973 // Unit offline Not ready 974 /* MCR|MARK */ 975 {0x09, NOT_READY, 0x04, 0x00}, 976 // Unrecovered disk error Not ready 977 /* Bad address mark */ 978 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 979 // Address mark not found for data field 980 /* TRK0 - Track 0 not found */ 981 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 982 // Hardware error 983 /* Abort: 0x04 is not translated here, see below */ 984 /* Media change request */ 985 {0x08, NOT_READY, 0x04, 0x00}, 986 // FIXME: faking offline 987 /* SRV/IDNF - ID not found */ 988 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 989 // Logical address out of range 990 /* MC - Media Changed */ 991 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 992 // Not ready to ready change, medium may have changed 993 /* ECC - Uncorrectable ECC error */ 994 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 995 // Unrecovered read error 996 /* BBD - block marked bad */ 997 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 998 // Block marked bad Medium error, unrecovered read error 999 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 1000 }; 1001 static const unsigned char stat_table[][4] = { 1002 /* Must be first because BUSY means no other bits valid */ 1003 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 1004 // Busy, fake parity for now 1005 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 1006 // Device ready, unaligned write command 1007 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 1008 // Device fault, internal target failure 1009 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 1010 // Timed out in xfer, fake parity for now 1011 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 1012 // Recovered ECC error Medium error, recovered 1013 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 1014 }; 1015 1016 /* 1017 * Is this an error we can process/parse 1018 */ 1019 if (drv_stat & ATA_BUSY) { 1020 drv_err = 0; /* Ignore the err bits, they're invalid */ 1021 } 1022 1023 if (drv_err) { 1024 /* Look for drv_err */ 1025 for (i = 0; sense_table[i][0] != 0xFF; i++) { 1026 /* Look for best matches first */ 1027 if ((sense_table[i][0] & drv_err) == 1028 sense_table[i][0]) { 1029 *sk = sense_table[i][1]; 1030 *asc = sense_table[i][2]; 1031 *ascq = sense_table[i][3]; 1032 goto translate_done; 1033 } 1034 } 1035 } 1036 1037 /* 1038 * Fall back to interpreting status bits. Note that if the drv_err 1039 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 1040 * is not descriptive enough. 1041 */ 1042 for (i = 0; stat_table[i][0] != 0xFF; i++) { 1043 if (stat_table[i][0] & drv_stat) { 1044 *sk = stat_table[i][1]; 1045 *asc = stat_table[i][2]; 1046 *ascq = stat_table[i][3]; 1047 goto translate_done; 1048 } 1049 } 1050 1051 /* 1052 * We need a sensible error return here, which is tricky, and one 1053 * that won't cause people to do things like return a disk wrongly. 1054 */ 1055 *sk = ABORTED_COMMAND; 1056 *asc = 0x00; 1057 *ascq = 0x00; 1058 1059 translate_done: 1060 if (verbose) 1061 pr_err("ata%u: translated ATA stat/err 0x%02x/%02x to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 1062 id, drv_stat, drv_err, *sk, *asc, *ascq); 1063 return; 1064 } 1065 1066 /* 1067 * ata_gen_passthru_sense - Generate check condition sense block. 1068 * @qc: Command that completed. 1069 * 1070 * This function is specific to the ATA descriptor format sense 1071 * block specified for the ATA pass through commands. Regardless 1072 * of whether the command errored or not, return a sense 1073 * block. Copy all controller registers into the sense 1074 * block. If there was no error, we get the request from an ATA 1075 * passthrough command, so we use the following sense data: 1076 * sk = RECOVERED ERROR 1077 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1078 * 1079 * 1080 * LOCKING: 1081 * None. 1082 */ 1083 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 1084 { 1085 struct scsi_cmnd *cmd = qc->scsicmd; 1086 struct ata_taskfile *tf = &qc->result_tf; 1087 unsigned char *sb = cmd->sense_buffer; 1088 unsigned char *desc = sb + 8; 1089 int verbose = qc->ap->ops->error_handler == NULL; 1090 u8 sense_key, asc, ascq; 1091 1092 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1093 1094 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1095 1096 /* 1097 * Use ata_to_sense_error() to map status register bits 1098 * onto sense key, asc & ascq. 1099 */ 1100 if (qc->err_mask || 1101 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1102 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1103 &sense_key, &asc, &ascq, verbose); 1104 ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq); 1105 } else { 1106 /* 1107 * ATA PASS-THROUGH INFORMATION AVAILABLE 1108 * Always in descriptor format sense. 1109 */ 1110 scsi_build_sense_buffer(1, cmd->sense_buffer, 1111 RECOVERED_ERROR, 0, 0x1D); 1112 } 1113 1114 if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) { 1115 u8 len; 1116 1117 /* descriptor format */ 1118 len = sb[7]; 1119 desc = (char *)scsi_sense_desc_find(sb, len + 8, 9); 1120 if (!desc) { 1121 if (SCSI_SENSE_BUFFERSIZE < len + 14) 1122 return; 1123 sb[7] = len + 14; 1124 desc = sb + 8 + len; 1125 } 1126 desc[0] = 9; 1127 desc[1] = 12; 1128 /* 1129 * Copy registers into sense buffer. 1130 */ 1131 desc[2] = 0x00; 1132 desc[3] = tf->feature; /* == error reg */ 1133 desc[5] = tf->nsect; 1134 desc[7] = tf->lbal; 1135 desc[9] = tf->lbam; 1136 desc[11] = tf->lbah; 1137 desc[12] = tf->device; 1138 desc[13] = tf->command; /* == status reg */ 1139 1140 /* 1141 * Fill in Extend bit, and the high order bytes 1142 * if applicable. 1143 */ 1144 if (tf->flags & ATA_TFLAG_LBA48) { 1145 desc[2] |= 0x01; 1146 desc[4] = tf->hob_nsect; 1147 desc[6] = tf->hob_lbal; 1148 desc[8] = tf->hob_lbam; 1149 desc[10] = tf->hob_lbah; 1150 } 1151 } else { 1152 /* Fixed sense format */ 1153 desc[0] = tf->feature; 1154 desc[1] = tf->command; /* status */ 1155 desc[2] = tf->device; 1156 desc[3] = tf->nsect; 1157 desc[7] = 0; 1158 if (tf->flags & ATA_TFLAG_LBA48) { 1159 desc[8] |= 0x80; 1160 if (tf->hob_nsect) 1161 desc[8] |= 0x40; 1162 if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah) 1163 desc[8] |= 0x20; 1164 } 1165 desc[9] = tf->lbal; 1166 desc[10] = tf->lbam; 1167 desc[11] = tf->lbah; 1168 } 1169 } 1170 1171 /** 1172 * ata_gen_ata_sense - generate a SCSI fixed sense block 1173 * @qc: Command that we are erroring out 1174 * 1175 * Generate sense block for a failed ATA command @qc. Descriptor 1176 * format is used to accommodate LBA48 block address. 1177 * 1178 * LOCKING: 1179 * None. 1180 */ 1181 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1182 { 1183 struct ata_device *dev = qc->dev; 1184 struct scsi_cmnd *cmd = qc->scsicmd; 1185 struct ata_taskfile *tf = &qc->result_tf; 1186 unsigned char *sb = cmd->sense_buffer; 1187 int verbose = qc->ap->ops->error_handler == NULL; 1188 u64 block; 1189 u8 sense_key, asc, ascq; 1190 1191 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1192 1193 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1194 1195 if (ata_dev_disabled(dev)) { 1196 /* Device disabled after error recovery */ 1197 /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */ 1198 ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21); 1199 return; 1200 } 1201 /* Use ata_to_sense_error() to map status register bits 1202 * onto sense key, asc & ascq. 1203 */ 1204 if (qc->err_mask || 1205 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1206 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1207 &sense_key, &asc, &ascq, verbose); 1208 ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq); 1209 } else { 1210 /* Could not decode error */ 1211 ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n", 1212 tf->command, qc->err_mask); 1213 ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0); 1214 return; 1215 } 1216 1217 block = ata_tf_read_block(&qc->result_tf, dev); 1218 if (block == U64_MAX) 1219 return; 1220 1221 scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block); 1222 } 1223 1224 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1225 { 1226 sdev->use_10_for_rw = 1; 1227 sdev->use_10_for_ms = 1; 1228 sdev->no_write_same = 1; 1229 1230 /* Schedule policy is determined by ->qc_defer() callback and 1231 * it needs to see every deferred qc. Set dev_blocked to 1 to 1232 * prevent SCSI midlayer from automatically deferring 1233 * requests. 1234 */ 1235 sdev->max_device_blocked = 1; 1236 } 1237 1238 /** 1239 * atapi_drain_needed - Check whether data transfer may overflow 1240 * @rq: request to be checked 1241 * 1242 * ATAPI commands which transfer variable length data to host 1243 * might overflow due to application error or hardware bug. This 1244 * function checks whether overflow should be drained and ignored 1245 * for @request. 1246 * 1247 * LOCKING: 1248 * None. 1249 * 1250 * RETURNS: 1251 * 1 if ; otherwise, 0. 1252 */ 1253 static int atapi_drain_needed(struct request *rq) 1254 { 1255 if (likely(!blk_rq_is_passthrough(rq))) 1256 return 0; 1257 1258 if (!blk_rq_bytes(rq) || op_is_write(req_op(rq))) 1259 return 0; 1260 1261 return atapi_cmd_type(scsi_req(rq)->cmd[0]) == ATAPI_MISC; 1262 } 1263 1264 static int ata_scsi_dev_config(struct scsi_device *sdev, 1265 struct ata_device *dev) 1266 { 1267 struct request_queue *q = sdev->request_queue; 1268 1269 if (!ata_id_has_unload(dev->id)) 1270 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1271 1272 /* configure max sectors */ 1273 blk_queue_max_hw_sectors(q, dev->max_sectors); 1274 1275 if (dev->class == ATA_DEV_ATAPI) { 1276 void *buf; 1277 1278 sdev->sector_size = ATA_SECT_SIZE; 1279 1280 /* set DMA padding */ 1281 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1282 1283 /* configure draining */ 1284 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1285 if (!buf) { 1286 ata_dev_err(dev, "drain buffer allocation failed\n"); 1287 return -ENOMEM; 1288 } 1289 1290 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1291 } else { 1292 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1293 sdev->manage_start_stop = 1; 1294 } 1295 1296 /* 1297 * ata_pio_sectors() expects buffer for each sector to not cross 1298 * page boundary. Enforce it by requiring buffers to be sector 1299 * aligned, which works iff sector_size is not larger than 1300 * PAGE_SIZE. ATAPI devices also need the alignment as 1301 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1302 */ 1303 if (sdev->sector_size > PAGE_SIZE) 1304 ata_dev_warn(dev, 1305 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1306 sdev->sector_size); 1307 1308 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1309 1310 if (dev->flags & ATA_DFLAG_AN) 1311 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1312 1313 if (dev->flags & ATA_DFLAG_NCQ) { 1314 int depth; 1315 1316 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1317 depth = min(ATA_MAX_QUEUE, depth); 1318 scsi_change_queue_depth(sdev, depth); 1319 } 1320 1321 blk_queue_flush_queueable(q, false); 1322 1323 if (dev->flags & ATA_DFLAG_TRUSTED) 1324 sdev->security_supported = 1; 1325 1326 dev->sdev = sdev; 1327 return 0; 1328 } 1329 1330 /** 1331 * ata_scsi_slave_config - Set SCSI device attributes 1332 * @sdev: SCSI device to examine 1333 * 1334 * This is called before we actually start reading 1335 * and writing to the device, to configure certain 1336 * SCSI mid-layer behaviors. 1337 * 1338 * LOCKING: 1339 * Defined by SCSI layer. We don't really care. 1340 */ 1341 1342 int ata_scsi_slave_config(struct scsi_device *sdev) 1343 { 1344 struct ata_port *ap = ata_shost_to_port(sdev->host); 1345 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1346 int rc = 0; 1347 1348 ata_scsi_sdev_config(sdev); 1349 1350 if (dev) 1351 rc = ata_scsi_dev_config(sdev, dev); 1352 1353 return rc; 1354 } 1355 1356 /** 1357 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1358 * @sdev: SCSI device to be destroyed 1359 * 1360 * @sdev is about to be destroyed for hot/warm unplugging. If 1361 * this unplugging was initiated by libata as indicated by NULL 1362 * dev->sdev, this function doesn't have to do anything. 1363 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1364 * Clear dev->sdev, schedule the device for ATA detach and invoke 1365 * EH. 1366 * 1367 * LOCKING: 1368 * Defined by SCSI layer. We don't really care. 1369 */ 1370 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1371 { 1372 struct ata_port *ap = ata_shost_to_port(sdev->host); 1373 struct request_queue *q = sdev->request_queue; 1374 unsigned long flags; 1375 struct ata_device *dev; 1376 1377 if (!ap->ops->error_handler) 1378 return; 1379 1380 spin_lock_irqsave(ap->lock, flags); 1381 dev = __ata_scsi_find_dev(ap, sdev); 1382 if (dev && dev->sdev) { 1383 /* SCSI device already in CANCEL state, no need to offline it */ 1384 dev->sdev = NULL; 1385 dev->flags |= ATA_DFLAG_DETACH; 1386 ata_port_schedule_eh(ap); 1387 } 1388 spin_unlock_irqrestore(ap->lock, flags); 1389 1390 kfree(q->dma_drain_buffer); 1391 q->dma_drain_buffer = NULL; 1392 q->dma_drain_size = 0; 1393 } 1394 1395 /** 1396 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1397 * @ap: ATA port to which the device change the queue depth 1398 * @sdev: SCSI device to configure queue depth for 1399 * @queue_depth: new queue depth 1400 * 1401 * libsas and libata have different approaches for associating a sdev to 1402 * its ata_port. 1403 * 1404 */ 1405 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1406 int queue_depth) 1407 { 1408 struct ata_device *dev; 1409 unsigned long flags; 1410 1411 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1412 return sdev->queue_depth; 1413 1414 dev = ata_scsi_find_dev(ap, sdev); 1415 if (!dev || !ata_dev_enabled(dev)) 1416 return sdev->queue_depth; 1417 1418 /* NCQ enabled? */ 1419 spin_lock_irqsave(ap->lock, flags); 1420 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1421 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1422 dev->flags |= ATA_DFLAG_NCQ_OFF; 1423 queue_depth = 1; 1424 } 1425 spin_unlock_irqrestore(ap->lock, flags); 1426 1427 /* limit and apply queue depth */ 1428 queue_depth = min(queue_depth, sdev->host->can_queue); 1429 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1430 queue_depth = min(queue_depth, ATA_MAX_QUEUE); 1431 1432 if (sdev->queue_depth == queue_depth) 1433 return -EINVAL; 1434 1435 return scsi_change_queue_depth(sdev, queue_depth); 1436 } 1437 1438 /** 1439 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1440 * @sdev: SCSI device to configure queue depth for 1441 * @queue_depth: new queue depth 1442 * 1443 * This is libata standard hostt->change_queue_depth callback. 1444 * SCSI will call into this callback when user tries to set queue 1445 * depth via sysfs. 1446 * 1447 * LOCKING: 1448 * SCSI layer (we don't care) 1449 * 1450 * RETURNS: 1451 * Newly configured queue depth. 1452 */ 1453 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1454 { 1455 struct ata_port *ap = ata_shost_to_port(sdev->host); 1456 1457 return __ata_change_queue_depth(ap, sdev, queue_depth); 1458 } 1459 1460 /** 1461 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1462 * @qc: Storage for translated ATA taskfile 1463 * 1464 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1465 * (to start). Perhaps these commands should be preceded by 1466 * CHECK POWER MODE to see what power mode the device is already in. 1467 * [See SAT revision 5 at www.t10.org] 1468 * 1469 * LOCKING: 1470 * spin_lock_irqsave(host lock) 1471 * 1472 * RETURNS: 1473 * Zero on success, non-zero on error. 1474 */ 1475 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1476 { 1477 struct scsi_cmnd *scmd = qc->scsicmd; 1478 struct ata_taskfile *tf = &qc->tf; 1479 const u8 *cdb = scmd->cmnd; 1480 u16 fp; 1481 u8 bp = 0xff; 1482 1483 if (scmd->cmd_len < 5) { 1484 fp = 4; 1485 goto invalid_fld; 1486 } 1487 1488 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1489 tf->protocol = ATA_PROT_NODATA; 1490 if (cdb[1] & 0x1) { 1491 ; /* ignore IMMED bit, violates sat-r05 */ 1492 } 1493 if (cdb[4] & 0x2) { 1494 fp = 4; 1495 bp = 1; 1496 goto invalid_fld; /* LOEJ bit set not supported */ 1497 } 1498 if (((cdb[4] >> 4) & 0xf) != 0) { 1499 fp = 4; 1500 bp = 3; 1501 goto invalid_fld; /* power conditions not supported */ 1502 } 1503 1504 if (cdb[4] & 0x1) { 1505 tf->nsect = 1; /* 1 sector, lba=0 */ 1506 1507 if (qc->dev->flags & ATA_DFLAG_LBA) { 1508 tf->flags |= ATA_TFLAG_LBA; 1509 1510 tf->lbah = 0x0; 1511 tf->lbam = 0x0; 1512 tf->lbal = 0x0; 1513 tf->device |= ATA_LBA; 1514 } else { 1515 /* CHS */ 1516 tf->lbal = 0x1; /* sect */ 1517 tf->lbam = 0x0; /* cyl low */ 1518 tf->lbah = 0x0; /* cyl high */ 1519 } 1520 1521 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1522 } else { 1523 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1524 * or S5) causing some drives to spin up and down again. 1525 */ 1526 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1527 system_state == SYSTEM_POWER_OFF) 1528 goto skip; 1529 1530 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1531 system_entering_hibernation()) 1532 goto skip; 1533 1534 /* Issue ATA STANDBY IMMEDIATE command */ 1535 tf->command = ATA_CMD_STANDBYNOW1; 1536 } 1537 1538 /* 1539 * Standby and Idle condition timers could be implemented but that 1540 * would require libata to implement the Power condition mode page 1541 * and allow the user to change it. Changing mode pages requires 1542 * MODE SELECT to be implemented. 1543 */ 1544 1545 return 0; 1546 1547 invalid_fld: 1548 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 1549 return 1; 1550 skip: 1551 scmd->result = SAM_STAT_GOOD; 1552 return 1; 1553 } 1554 1555 1556 /** 1557 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1558 * @qc: Storage for translated ATA taskfile 1559 * 1560 * Sets up an ATA taskfile to issue FLUSH CACHE or 1561 * FLUSH CACHE EXT. 1562 * 1563 * LOCKING: 1564 * spin_lock_irqsave(host lock) 1565 * 1566 * RETURNS: 1567 * Zero on success, non-zero on error. 1568 */ 1569 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1570 { 1571 struct ata_taskfile *tf = &qc->tf; 1572 1573 tf->flags |= ATA_TFLAG_DEVICE; 1574 tf->protocol = ATA_PROT_NODATA; 1575 1576 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1577 tf->command = ATA_CMD_FLUSH_EXT; 1578 else 1579 tf->command = ATA_CMD_FLUSH; 1580 1581 /* flush is critical for IO integrity, consider it an IO command */ 1582 qc->flags |= ATA_QCFLAG_IO; 1583 1584 return 0; 1585 } 1586 1587 /** 1588 * scsi_6_lba_len - Get LBA and transfer length 1589 * @cdb: SCSI command to translate 1590 * 1591 * Calculate LBA and transfer length for 6-byte commands. 1592 * 1593 * RETURNS: 1594 * @plba: the LBA 1595 * @plen: the transfer length 1596 */ 1597 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1598 { 1599 u64 lba = 0; 1600 u32 len; 1601 1602 VPRINTK("six-byte command\n"); 1603 1604 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1605 lba |= ((u64)cdb[2]) << 8; 1606 lba |= ((u64)cdb[3]); 1607 1608 len = cdb[4]; 1609 1610 *plba = lba; 1611 *plen = len; 1612 } 1613 1614 /** 1615 * scsi_10_lba_len - Get LBA and transfer length 1616 * @cdb: SCSI command to translate 1617 * 1618 * Calculate LBA and transfer length for 10-byte commands. 1619 * 1620 * RETURNS: 1621 * @plba: the LBA 1622 * @plen: the transfer length 1623 */ 1624 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1625 { 1626 u64 lba = 0; 1627 u32 len = 0; 1628 1629 VPRINTK("ten-byte command\n"); 1630 1631 lba |= ((u64)cdb[2]) << 24; 1632 lba |= ((u64)cdb[3]) << 16; 1633 lba |= ((u64)cdb[4]) << 8; 1634 lba |= ((u64)cdb[5]); 1635 1636 len |= ((u32)cdb[7]) << 8; 1637 len |= ((u32)cdb[8]); 1638 1639 *plba = lba; 1640 *plen = len; 1641 } 1642 1643 /** 1644 * scsi_16_lba_len - Get LBA and transfer length 1645 * @cdb: SCSI command to translate 1646 * 1647 * Calculate LBA and transfer length for 16-byte commands. 1648 * 1649 * RETURNS: 1650 * @plba: the LBA 1651 * @plen: the transfer length 1652 */ 1653 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1654 { 1655 u64 lba = 0; 1656 u32 len = 0; 1657 1658 VPRINTK("sixteen-byte command\n"); 1659 1660 lba |= ((u64)cdb[2]) << 56; 1661 lba |= ((u64)cdb[3]) << 48; 1662 lba |= ((u64)cdb[4]) << 40; 1663 lba |= ((u64)cdb[5]) << 32; 1664 lba |= ((u64)cdb[6]) << 24; 1665 lba |= ((u64)cdb[7]) << 16; 1666 lba |= ((u64)cdb[8]) << 8; 1667 lba |= ((u64)cdb[9]); 1668 1669 len |= ((u32)cdb[10]) << 24; 1670 len |= ((u32)cdb[11]) << 16; 1671 len |= ((u32)cdb[12]) << 8; 1672 len |= ((u32)cdb[13]); 1673 1674 *plba = lba; 1675 *plen = len; 1676 } 1677 1678 /** 1679 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1680 * @qc: Storage for translated ATA taskfile 1681 * 1682 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1683 * 1684 * LOCKING: 1685 * spin_lock_irqsave(host lock) 1686 * 1687 * RETURNS: 1688 * Zero on success, non-zero on error. 1689 */ 1690 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1691 { 1692 struct scsi_cmnd *scmd = qc->scsicmd; 1693 struct ata_taskfile *tf = &qc->tf; 1694 struct ata_device *dev = qc->dev; 1695 u64 dev_sectors = qc->dev->n_sectors; 1696 const u8 *cdb = scmd->cmnd; 1697 u64 block; 1698 u32 n_block; 1699 u16 fp; 1700 1701 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1702 tf->protocol = ATA_PROT_NODATA; 1703 1704 if (cdb[0] == VERIFY) { 1705 if (scmd->cmd_len < 10) { 1706 fp = 9; 1707 goto invalid_fld; 1708 } 1709 scsi_10_lba_len(cdb, &block, &n_block); 1710 } else if (cdb[0] == VERIFY_16) { 1711 if (scmd->cmd_len < 16) { 1712 fp = 15; 1713 goto invalid_fld; 1714 } 1715 scsi_16_lba_len(cdb, &block, &n_block); 1716 } else { 1717 fp = 0; 1718 goto invalid_fld; 1719 } 1720 1721 if (!n_block) 1722 goto nothing_to_do; 1723 if (block >= dev_sectors) 1724 goto out_of_range; 1725 if ((block + n_block) > dev_sectors) 1726 goto out_of_range; 1727 1728 if (dev->flags & ATA_DFLAG_LBA) { 1729 tf->flags |= ATA_TFLAG_LBA; 1730 1731 if (lba_28_ok(block, n_block)) { 1732 /* use LBA28 */ 1733 tf->command = ATA_CMD_VERIFY; 1734 tf->device |= (block >> 24) & 0xf; 1735 } else if (lba_48_ok(block, n_block)) { 1736 if (!(dev->flags & ATA_DFLAG_LBA48)) 1737 goto out_of_range; 1738 1739 /* use LBA48 */ 1740 tf->flags |= ATA_TFLAG_LBA48; 1741 tf->command = ATA_CMD_VERIFY_EXT; 1742 1743 tf->hob_nsect = (n_block >> 8) & 0xff; 1744 1745 tf->hob_lbah = (block >> 40) & 0xff; 1746 tf->hob_lbam = (block >> 32) & 0xff; 1747 tf->hob_lbal = (block >> 24) & 0xff; 1748 } else 1749 /* request too large even for LBA48 */ 1750 goto out_of_range; 1751 1752 tf->nsect = n_block & 0xff; 1753 1754 tf->lbah = (block >> 16) & 0xff; 1755 tf->lbam = (block >> 8) & 0xff; 1756 tf->lbal = block & 0xff; 1757 1758 tf->device |= ATA_LBA; 1759 } else { 1760 /* CHS */ 1761 u32 sect, head, cyl, track; 1762 1763 if (!lba_28_ok(block, n_block)) 1764 goto out_of_range; 1765 1766 /* Convert LBA to CHS */ 1767 track = (u32)block / dev->sectors; 1768 cyl = track / dev->heads; 1769 head = track % dev->heads; 1770 sect = (u32)block % dev->sectors + 1; 1771 1772 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1773 (u32)block, track, cyl, head, sect); 1774 1775 /* Check whether the converted CHS can fit. 1776 Cylinder: 0-65535 1777 Head: 0-15 1778 Sector: 1-255*/ 1779 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1780 goto out_of_range; 1781 1782 tf->command = ATA_CMD_VERIFY; 1783 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1784 tf->lbal = sect; 1785 tf->lbam = cyl; 1786 tf->lbah = cyl >> 8; 1787 tf->device |= head; 1788 } 1789 1790 return 0; 1791 1792 invalid_fld: 1793 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1794 return 1; 1795 1796 out_of_range: 1797 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1798 /* "Logical Block Address out of range" */ 1799 return 1; 1800 1801 nothing_to_do: 1802 scmd->result = SAM_STAT_GOOD; 1803 return 1; 1804 } 1805 1806 /** 1807 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1808 * @qc: Storage for translated ATA taskfile 1809 * 1810 * Converts any of six SCSI read/write commands into the 1811 * ATA counterpart, including starting sector (LBA), 1812 * sector count, and taking into account the device's LBA48 1813 * support. 1814 * 1815 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1816 * %WRITE_16 are currently supported. 1817 * 1818 * LOCKING: 1819 * spin_lock_irqsave(host lock) 1820 * 1821 * RETURNS: 1822 * Zero on success, non-zero on error. 1823 */ 1824 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1825 { 1826 struct scsi_cmnd *scmd = qc->scsicmd; 1827 const u8 *cdb = scmd->cmnd; 1828 struct request *rq = scmd->request; 1829 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq)); 1830 unsigned int tf_flags = 0; 1831 u64 block; 1832 u32 n_block; 1833 int rc; 1834 u16 fp = 0; 1835 1836 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1837 tf_flags |= ATA_TFLAG_WRITE; 1838 1839 /* Calculate the SCSI LBA, transfer length and FUA. */ 1840 switch (cdb[0]) { 1841 case READ_10: 1842 case WRITE_10: 1843 if (unlikely(scmd->cmd_len < 10)) { 1844 fp = 9; 1845 goto invalid_fld; 1846 } 1847 scsi_10_lba_len(cdb, &block, &n_block); 1848 if (cdb[1] & (1 << 3)) 1849 tf_flags |= ATA_TFLAG_FUA; 1850 break; 1851 case READ_6: 1852 case WRITE_6: 1853 if (unlikely(scmd->cmd_len < 6)) { 1854 fp = 5; 1855 goto invalid_fld; 1856 } 1857 scsi_6_lba_len(cdb, &block, &n_block); 1858 1859 /* for 6-byte r/w commands, transfer length 0 1860 * means 256 blocks of data, not 0 block. 1861 */ 1862 if (!n_block) 1863 n_block = 256; 1864 break; 1865 case READ_16: 1866 case WRITE_16: 1867 if (unlikely(scmd->cmd_len < 16)) { 1868 fp = 15; 1869 goto invalid_fld; 1870 } 1871 scsi_16_lba_len(cdb, &block, &n_block); 1872 if (cdb[1] & (1 << 3)) 1873 tf_flags |= ATA_TFLAG_FUA; 1874 break; 1875 default: 1876 DPRINTK("no-byte command\n"); 1877 fp = 0; 1878 goto invalid_fld; 1879 } 1880 1881 /* Check and compose ATA command */ 1882 if (!n_block) 1883 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1884 * length 0 means transfer 0 block of data. 1885 * However, for ATA R/W commands, sector count 0 means 1886 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1887 * 1888 * WARNING: one or two older ATA drives treat 0 as 0... 1889 */ 1890 goto nothing_to_do; 1891 1892 qc->flags |= ATA_QCFLAG_IO; 1893 qc->nbytes = n_block * scmd->device->sector_size; 1894 1895 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1896 qc->hw_tag, class); 1897 1898 if (likely(rc == 0)) 1899 return 0; 1900 1901 if (rc == -ERANGE) 1902 goto out_of_range; 1903 /* treat all other errors as -EINVAL, fall through */ 1904 invalid_fld: 1905 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 1906 return 1; 1907 1908 out_of_range: 1909 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1910 /* "Logical Block Address out of range" */ 1911 return 1; 1912 1913 nothing_to_do: 1914 scmd->result = SAM_STAT_GOOD; 1915 return 1; 1916 } 1917 1918 static void ata_qc_done(struct ata_queued_cmd *qc) 1919 { 1920 struct scsi_cmnd *cmd = qc->scsicmd; 1921 void (*done)(struct scsi_cmnd *) = qc->scsidone; 1922 1923 ata_qc_free(qc); 1924 done(cmd); 1925 } 1926 1927 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1928 { 1929 struct ata_port *ap = qc->ap; 1930 struct scsi_cmnd *cmd = qc->scsicmd; 1931 u8 *cdb = cmd->cmnd; 1932 int need_sense = (qc->err_mask != 0); 1933 1934 /* For ATA pass thru (SAT) commands, generate a sense block if 1935 * user mandated it or if there's an error. Note that if we 1936 * generate because the user forced us to [CK_COND =1], a check 1937 * condition is generated and the ATA register values are returned 1938 * whether the command completed successfully or not. If there 1939 * was no error, we use the following sense data: 1940 * sk = RECOVERED ERROR 1941 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1942 */ 1943 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1944 ((cdb[2] & 0x20) || need_sense)) 1945 ata_gen_passthru_sense(qc); 1946 else if (qc->flags & ATA_QCFLAG_SENSE_VALID) 1947 cmd->result = SAM_STAT_CHECK_CONDITION; 1948 else if (need_sense) 1949 ata_gen_ata_sense(qc); 1950 else 1951 cmd->result = SAM_STAT_GOOD; 1952 1953 if (need_sense && !ap->ops->error_handler) 1954 ata_dump_status(ap->print_id, &qc->result_tf); 1955 1956 ata_qc_done(qc); 1957 } 1958 1959 /** 1960 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1961 * @dev: ATA device to which the command is addressed 1962 * @cmd: SCSI command to execute 1963 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1964 * 1965 * Our ->queuecommand() function has decided that the SCSI 1966 * command issued can be directly translated into an ATA 1967 * command, rather than handled internally. 1968 * 1969 * This function sets up an ata_queued_cmd structure for the 1970 * SCSI command, and sends that ata_queued_cmd to the hardware. 1971 * 1972 * The xlat_func argument (actor) returns 0 if ready to execute 1973 * ATA command, else 1 to finish translation. If 1 is returned 1974 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1975 * to be set reflecting an error condition or clean (early) 1976 * termination. 1977 * 1978 * LOCKING: 1979 * spin_lock_irqsave(host lock) 1980 * 1981 * RETURNS: 1982 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1983 * needs to be deferred. 1984 */ 1985 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1986 ata_xlat_func_t xlat_func) 1987 { 1988 struct ata_port *ap = dev->link->ap; 1989 struct ata_queued_cmd *qc; 1990 int rc; 1991 1992 VPRINTK("ENTER\n"); 1993 1994 qc = ata_scsi_qc_new(dev, cmd); 1995 if (!qc) 1996 goto err_mem; 1997 1998 /* data is present; dma-map it */ 1999 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 2000 cmd->sc_data_direction == DMA_TO_DEVICE) { 2001 if (unlikely(scsi_bufflen(cmd) < 1)) { 2002 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 2003 goto err_did; 2004 } 2005 2006 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 2007 2008 qc->dma_dir = cmd->sc_data_direction; 2009 } 2010 2011 qc->complete_fn = ata_scsi_qc_complete; 2012 2013 if (xlat_func(qc)) 2014 goto early_finish; 2015 2016 if (ap->ops->qc_defer) { 2017 if ((rc = ap->ops->qc_defer(qc))) 2018 goto defer; 2019 } 2020 2021 /* select device, send command to hardware */ 2022 ata_qc_issue(qc); 2023 2024 VPRINTK("EXIT\n"); 2025 return 0; 2026 2027 early_finish: 2028 ata_qc_free(qc); 2029 cmd->scsi_done(cmd); 2030 DPRINTK("EXIT - early finish (good or error)\n"); 2031 return 0; 2032 2033 err_did: 2034 ata_qc_free(qc); 2035 cmd->result = (DID_ERROR << 16); 2036 cmd->scsi_done(cmd); 2037 err_mem: 2038 DPRINTK("EXIT - internal\n"); 2039 return 0; 2040 2041 defer: 2042 ata_qc_free(qc); 2043 DPRINTK("EXIT - defer\n"); 2044 if (rc == ATA_DEFER_LINK) 2045 return SCSI_MLQUEUE_DEVICE_BUSY; 2046 else 2047 return SCSI_MLQUEUE_HOST_BUSY; 2048 } 2049 2050 struct ata_scsi_args { 2051 struct ata_device *dev; 2052 u16 *id; 2053 struct scsi_cmnd *cmd; 2054 }; 2055 2056 /** 2057 * ata_scsi_rbuf_get - Map response buffer. 2058 * @cmd: SCSI command containing buffer to be mapped. 2059 * @flags: unsigned long variable to store irq enable status 2060 * @copy_in: copy in from user buffer 2061 * 2062 * Prepare buffer for simulated SCSI commands. 2063 * 2064 * LOCKING: 2065 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 2066 * 2067 * RETURNS: 2068 * Pointer to response buffer. 2069 */ 2070 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 2071 unsigned long *flags) 2072 { 2073 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 2074 2075 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 2076 if (copy_in) 2077 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 2078 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 2079 return ata_scsi_rbuf; 2080 } 2081 2082 /** 2083 * ata_scsi_rbuf_put - Unmap response buffer. 2084 * @cmd: SCSI command containing buffer to be unmapped. 2085 * @copy_out: copy out result 2086 * @flags: @flags passed to ata_scsi_rbuf_get() 2087 * 2088 * Returns rbuf buffer. The result is copied to @cmd's buffer if 2089 * @copy_back is true. 2090 * 2091 * LOCKING: 2092 * Unlocks ata_scsi_rbuf_lock. 2093 */ 2094 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 2095 unsigned long *flags) 2096 { 2097 if (copy_out) 2098 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 2099 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 2100 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 2101 } 2102 2103 /** 2104 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 2105 * @args: device IDENTIFY data / SCSI command of interest. 2106 * @actor: Callback hook for desired SCSI command simulator 2107 * 2108 * Takes care of the hard work of simulating a SCSI command... 2109 * Mapping the response buffer, calling the command's handler, 2110 * and handling the handler's return value. This return value 2111 * indicates whether the handler wishes the SCSI command to be 2112 * completed successfully (0), or not (in which case cmd->result 2113 * and sense buffer are assumed to be set). 2114 * 2115 * LOCKING: 2116 * spin_lock_irqsave(host lock) 2117 */ 2118 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 2119 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 2120 { 2121 u8 *rbuf; 2122 unsigned int rc; 2123 struct scsi_cmnd *cmd = args->cmd; 2124 unsigned long flags; 2125 2126 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 2127 rc = actor(args, rbuf); 2128 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 2129 2130 if (rc == 0) 2131 cmd->result = SAM_STAT_GOOD; 2132 } 2133 2134 /** 2135 * ata_scsiop_inq_std - Simulate INQUIRY command 2136 * @args: device IDENTIFY data / SCSI command of interest. 2137 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2138 * 2139 * Returns standard device identification data associated 2140 * with non-VPD INQUIRY command output. 2141 * 2142 * LOCKING: 2143 * spin_lock_irqsave(host lock) 2144 */ 2145 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 2146 { 2147 static const u8 versions[] = { 2148 0x00, 2149 0x60, /* SAM-3 (no version claimed) */ 2150 2151 0x03, 2152 0x20, /* SBC-2 (no version claimed) */ 2153 2154 0x03, 2155 0x00 /* SPC-3 (no version claimed) */ 2156 }; 2157 static const u8 versions_zbc[] = { 2158 0x00, 2159 0xA0, /* SAM-5 (no version claimed) */ 2160 2161 0x06, 2162 0x00, /* SBC-4 (no version claimed) */ 2163 2164 0x05, 2165 0xC0, /* SPC-5 (no version claimed) */ 2166 2167 0x60, 2168 0x24, /* ZBC r05 */ 2169 }; 2170 2171 u8 hdr[] = { 2172 TYPE_DISK, 2173 0, 2174 0x5, /* claim SPC-3 version compatibility */ 2175 2, 2176 95 - 4, 2177 0, 2178 0, 2179 2 2180 }; 2181 2182 VPRINTK("ENTER\n"); 2183 2184 /* set scsi removable (RMB) bit per ata bit, or if the 2185 * AHCI port says it's external (Hotplug-capable, eSATA). 2186 */ 2187 if (ata_id_removable(args->id) || 2188 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) 2189 hdr[1] |= (1 << 7); 2190 2191 if (args->dev->class == ATA_DEV_ZAC) { 2192 hdr[0] = TYPE_ZBC; 2193 hdr[2] = 0x7; /* claim SPC-5 version compatibility */ 2194 } 2195 2196 memcpy(rbuf, hdr, sizeof(hdr)); 2197 memcpy(&rbuf[8], "ATA ", 8); 2198 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 2199 2200 /* From SAT, use last 2 words from fw rev unless they are spaces */ 2201 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 2202 if (strncmp(&rbuf[32], " ", 4) == 0) 2203 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2204 2205 if (rbuf[32] == 0 || rbuf[32] == ' ') 2206 memcpy(&rbuf[32], "n/a ", 4); 2207 2208 if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC) 2209 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 2210 else 2211 memcpy(rbuf + 58, versions, sizeof(versions)); 2212 2213 return 0; 2214 } 2215 2216 /** 2217 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2218 * @args: device IDENTIFY data / SCSI command of interest. 2219 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2220 * 2221 * Returns list of inquiry VPD pages available. 2222 * 2223 * LOCKING: 2224 * spin_lock_irqsave(host lock) 2225 */ 2226 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2227 { 2228 int num_pages; 2229 static const u8 pages[] = { 2230 0x00, /* page 0x00, this page */ 2231 0x80, /* page 0x80, unit serial no page */ 2232 0x83, /* page 0x83, device ident page */ 2233 0x89, /* page 0x89, ata info page */ 2234 0xb0, /* page 0xb0, block limits page */ 2235 0xb1, /* page 0xb1, block device characteristics page */ 2236 0xb2, /* page 0xb2, thin provisioning page */ 2237 0xb6, /* page 0xb6, zoned block device characteristics */ 2238 }; 2239 2240 num_pages = sizeof(pages); 2241 if (!(args->dev->flags & ATA_DFLAG_ZAC)) 2242 num_pages--; 2243 rbuf[3] = num_pages; /* number of supported VPD pages */ 2244 memcpy(rbuf + 4, pages, num_pages); 2245 return 0; 2246 } 2247 2248 /** 2249 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2250 * @args: device IDENTIFY data / SCSI command of interest. 2251 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2252 * 2253 * Returns ATA device serial number. 2254 * 2255 * LOCKING: 2256 * spin_lock_irqsave(host lock) 2257 */ 2258 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2259 { 2260 static const u8 hdr[] = { 2261 0, 2262 0x80, /* this page code */ 2263 0, 2264 ATA_ID_SERNO_LEN, /* page len */ 2265 }; 2266 2267 memcpy(rbuf, hdr, sizeof(hdr)); 2268 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2269 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2270 return 0; 2271 } 2272 2273 /** 2274 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2275 * @args: device IDENTIFY data / SCSI command of interest. 2276 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2277 * 2278 * Yields two logical unit device identification designators: 2279 * - vendor specific ASCII containing the ATA serial number 2280 * - SAT defined "t10 vendor id based" containing ASCII vendor 2281 * name ("ATA "), model and serial numbers. 2282 * 2283 * LOCKING: 2284 * spin_lock_irqsave(host lock) 2285 */ 2286 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2287 { 2288 const int sat_model_serial_desc_len = 68; 2289 int num; 2290 2291 rbuf[1] = 0x83; /* this page code */ 2292 num = 4; 2293 2294 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2295 rbuf[num + 0] = 2; 2296 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2297 num += 4; 2298 ata_id_string(args->id, (unsigned char *) rbuf + num, 2299 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2300 num += ATA_ID_SERNO_LEN; 2301 2302 /* SAT defined lu model and serial numbers descriptor */ 2303 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2304 rbuf[num + 0] = 2; 2305 rbuf[num + 1] = 1; 2306 rbuf[num + 3] = sat_model_serial_desc_len; 2307 num += 4; 2308 memcpy(rbuf + num, "ATA ", 8); 2309 num += 8; 2310 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2311 ATA_ID_PROD_LEN); 2312 num += ATA_ID_PROD_LEN; 2313 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2314 ATA_ID_SERNO_LEN); 2315 num += ATA_ID_SERNO_LEN; 2316 2317 if (ata_id_has_wwn(args->id)) { 2318 /* SAT defined lu world wide name */ 2319 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2320 rbuf[num + 0] = 1; 2321 rbuf[num + 1] = 3; 2322 rbuf[num + 3] = ATA_ID_WWN_LEN; 2323 num += 4; 2324 ata_id_string(args->id, (unsigned char *) rbuf + num, 2325 ATA_ID_WWN, ATA_ID_WWN_LEN); 2326 num += ATA_ID_WWN_LEN; 2327 } 2328 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2329 return 0; 2330 } 2331 2332 /** 2333 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2334 * @args: device IDENTIFY data / SCSI command of interest. 2335 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2336 * 2337 * Yields SAT-specified ATA VPD page. 2338 * 2339 * LOCKING: 2340 * spin_lock_irqsave(host lock) 2341 */ 2342 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2343 { 2344 struct ata_taskfile tf; 2345 2346 memset(&tf, 0, sizeof(tf)); 2347 2348 rbuf[1] = 0x89; /* our page code */ 2349 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2350 rbuf[3] = (0x238 & 0xff); 2351 2352 memcpy(&rbuf[8], "linux ", 8); 2353 memcpy(&rbuf[16], "libata ", 16); 2354 memcpy(&rbuf[32], DRV_VERSION, 4); 2355 2356 /* we don't store the ATA device signature, so we fake it */ 2357 2358 tf.command = ATA_DRDY; /* really, this is Status reg */ 2359 tf.lbal = 0x1; 2360 tf.nsect = 0x1; 2361 2362 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2363 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2364 2365 rbuf[56] = ATA_CMD_ID_ATA; 2366 2367 memcpy(&rbuf[60], &args->id[0], 512); 2368 return 0; 2369 } 2370 2371 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2372 { 2373 u16 min_io_sectors; 2374 2375 rbuf[1] = 0xb0; 2376 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2377 2378 /* 2379 * Optimal transfer length granularity. 2380 * 2381 * This is always one physical block, but for disks with a smaller 2382 * logical than physical sector size we need to figure out what the 2383 * latter is. 2384 */ 2385 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2386 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2387 2388 /* 2389 * Optimal unmap granularity. 2390 * 2391 * The ATA spec doesn't even know about a granularity or alignment 2392 * for the TRIM command. We can leave away most of the unmap related 2393 * VPD page entries, but we have specifify a granularity to signal 2394 * that we support some form of unmap - in thise case via WRITE SAME 2395 * with the unmap bit set. 2396 */ 2397 if (ata_id_has_trim(args->id)) { 2398 put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM, &rbuf[36]); 2399 put_unaligned_be32(1, &rbuf[28]); 2400 } 2401 2402 return 0; 2403 } 2404 2405 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2406 { 2407 int form_factor = ata_id_form_factor(args->id); 2408 int media_rotation_rate = ata_id_rotation_rate(args->id); 2409 u8 zoned = ata_id_zoned_cap(args->id); 2410 2411 rbuf[1] = 0xb1; 2412 rbuf[3] = 0x3c; 2413 rbuf[4] = media_rotation_rate >> 8; 2414 rbuf[5] = media_rotation_rate; 2415 rbuf[7] = form_factor; 2416 if (zoned) 2417 rbuf[8] = (zoned << 4); 2418 2419 return 0; 2420 } 2421 2422 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2423 { 2424 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2425 rbuf[1] = 0xb2; 2426 rbuf[3] = 0x4; 2427 rbuf[5] = 1 << 6; /* TPWS */ 2428 2429 return 0; 2430 } 2431 2432 static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) 2433 { 2434 /* 2435 * zbc-r05 SCSI Zoned Block device characteristics VPD page 2436 */ 2437 rbuf[1] = 0xb6; 2438 rbuf[3] = 0x3C; 2439 2440 /* 2441 * URSWRZ bit is only meaningful for host-managed ZAC drives 2442 */ 2443 if (args->dev->zac_zoned_cap & 1) 2444 rbuf[4] |= 1; 2445 put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]); 2446 put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]); 2447 put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]); 2448 2449 return 0; 2450 } 2451 2452 /** 2453 * modecpy - Prepare response for MODE SENSE 2454 * @dest: output buffer 2455 * @src: data being copied 2456 * @n: length of mode page 2457 * @changeable: whether changeable parameters are requested 2458 * 2459 * Generate a generic MODE SENSE page for either current or changeable 2460 * parameters. 2461 * 2462 * LOCKING: 2463 * None. 2464 */ 2465 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2466 { 2467 if (changeable) { 2468 memcpy(dest, src, 2); 2469 memset(dest + 2, 0, n - 2); 2470 } else { 2471 memcpy(dest, src, n); 2472 } 2473 } 2474 2475 /** 2476 * ata_msense_caching - Simulate MODE SENSE caching info page 2477 * @id: device IDENTIFY data 2478 * @buf: output buffer 2479 * @changeable: whether changeable parameters are requested 2480 * 2481 * Generate a caching info page, which conditionally indicates 2482 * write caching to the SCSI layer, depending on device 2483 * capabilities. 2484 * 2485 * LOCKING: 2486 * None. 2487 */ 2488 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2489 { 2490 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2491 if (changeable) { 2492 buf[2] |= (1 << 2); /* ata_mselect_caching() */ 2493 } else { 2494 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */ 2495 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */ 2496 } 2497 return sizeof(def_cache_mpage); 2498 } 2499 2500 /** 2501 * ata_msense_control - Simulate MODE SENSE control mode page 2502 * @dev: ATA device of interest 2503 * @buf: output buffer 2504 * @changeable: whether changeable parameters are requested 2505 * 2506 * Generate a generic MODE SENSE control mode page. 2507 * 2508 * LOCKING: 2509 * None. 2510 */ 2511 static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf, 2512 bool changeable) 2513 { 2514 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2515 if (changeable) { 2516 buf[2] |= (1 << 2); /* ata_mselect_control() */ 2517 } else { 2518 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); 2519 2520 buf[2] |= (d_sense << 2); /* descriptor format sense data */ 2521 } 2522 return sizeof(def_control_mpage); 2523 } 2524 2525 /** 2526 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2527 * @buf: output buffer 2528 * @changeable: whether changeable parameters are requested 2529 * 2530 * Generate a generic MODE SENSE r/w error recovery page. 2531 * 2532 * LOCKING: 2533 * None. 2534 */ 2535 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2536 { 2537 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2538 changeable); 2539 return sizeof(def_rw_recovery_mpage); 2540 } 2541 2542 /* 2543 * We can turn this into a real blacklist if it's needed, for now just 2544 * blacklist any Maxtor BANC1G10 revision firmware 2545 */ 2546 static int ata_dev_supports_fua(u16 *id) 2547 { 2548 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2549 2550 if (!libata_fua) 2551 return 0; 2552 if (!ata_id_has_fua(id)) 2553 return 0; 2554 2555 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2556 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2557 2558 if (strcmp(model, "Maxtor")) 2559 return 1; 2560 if (strcmp(fw, "BANC1G10")) 2561 return 1; 2562 2563 return 0; /* blacklisted */ 2564 } 2565 2566 /** 2567 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2568 * @args: device IDENTIFY data / SCSI command of interest. 2569 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2570 * 2571 * Simulate MODE SENSE commands. Assume this is invoked for direct 2572 * access devices (e.g. disks) only. There should be no block 2573 * descriptor for other device types. 2574 * 2575 * LOCKING: 2576 * spin_lock_irqsave(host lock) 2577 */ 2578 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2579 { 2580 struct ata_device *dev = args->dev; 2581 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2582 static const u8 sat_blk_desc[] = { 2583 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2584 0, 2585 0, 0x2, 0x0 /* block length: 512 bytes */ 2586 }; 2587 u8 pg, spg; 2588 unsigned int ebd, page_control, six_byte; 2589 u8 dpofua, bp = 0xff; 2590 u16 fp; 2591 2592 VPRINTK("ENTER\n"); 2593 2594 six_byte = (scsicmd[0] == MODE_SENSE); 2595 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2596 /* 2597 * LLBA bit in msense(10) ignored (compliant) 2598 */ 2599 2600 page_control = scsicmd[2] >> 6; 2601 switch (page_control) { 2602 case 0: /* current */ 2603 case 1: /* changeable */ 2604 case 2: /* defaults */ 2605 break; /* supported */ 2606 case 3: /* saved */ 2607 goto saving_not_supp; 2608 default: 2609 fp = 2; 2610 bp = 6; 2611 goto invalid_fld; 2612 } 2613 2614 if (six_byte) 2615 p += 4 + (ebd ? 8 : 0); 2616 else 2617 p += 8 + (ebd ? 8 : 0); 2618 2619 pg = scsicmd[2] & 0x3f; 2620 spg = scsicmd[3]; 2621 /* 2622 * No mode subpages supported (yet) but asking for _all_ 2623 * subpages may be valid 2624 */ 2625 if (spg && (spg != ALL_SUB_MPAGES)) { 2626 fp = 3; 2627 goto invalid_fld; 2628 } 2629 2630 switch(pg) { 2631 case RW_RECOVERY_MPAGE: 2632 p += ata_msense_rw_recovery(p, page_control == 1); 2633 break; 2634 2635 case CACHE_MPAGE: 2636 p += ata_msense_caching(args->id, p, page_control == 1); 2637 break; 2638 2639 case CONTROL_MPAGE: 2640 p += ata_msense_control(args->dev, p, page_control == 1); 2641 break; 2642 2643 case ALL_MPAGES: 2644 p += ata_msense_rw_recovery(p, page_control == 1); 2645 p += ata_msense_caching(args->id, p, page_control == 1); 2646 p += ata_msense_control(args->dev, p, page_control == 1); 2647 break; 2648 2649 default: /* invalid page code */ 2650 fp = 2; 2651 goto invalid_fld; 2652 } 2653 2654 dpofua = 0; 2655 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2656 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2657 dpofua = 1 << 4; 2658 2659 if (six_byte) { 2660 rbuf[0] = p - rbuf - 1; 2661 rbuf[2] |= dpofua; 2662 if (ebd) { 2663 rbuf[3] = sizeof(sat_blk_desc); 2664 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2665 } 2666 } else { 2667 unsigned int output_len = p - rbuf - 2; 2668 2669 rbuf[0] = output_len >> 8; 2670 rbuf[1] = output_len; 2671 rbuf[3] |= dpofua; 2672 if (ebd) { 2673 rbuf[7] = sizeof(sat_blk_desc); 2674 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2675 } 2676 } 2677 return 0; 2678 2679 invalid_fld: 2680 ata_scsi_set_invalid_field(dev, args->cmd, fp, bp); 2681 return 1; 2682 2683 saving_not_supp: 2684 ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2685 /* "Saving parameters not supported" */ 2686 return 1; 2687 } 2688 2689 /** 2690 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2691 * @args: device IDENTIFY data / SCSI command of interest. 2692 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2693 * 2694 * Simulate READ CAPACITY commands. 2695 * 2696 * LOCKING: 2697 * None. 2698 */ 2699 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2700 { 2701 struct ata_device *dev = args->dev; 2702 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2703 u32 sector_size; /* physical sector size in bytes */ 2704 u8 log2_per_phys; 2705 u16 lowest_aligned; 2706 2707 sector_size = ata_id_logical_sector_size(dev->id); 2708 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2709 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2710 2711 VPRINTK("ENTER\n"); 2712 2713 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2714 if (last_lba >= 0xffffffffULL) 2715 last_lba = 0xffffffff; 2716 2717 /* sector count, 32-bit */ 2718 rbuf[0] = last_lba >> (8 * 3); 2719 rbuf[1] = last_lba >> (8 * 2); 2720 rbuf[2] = last_lba >> (8 * 1); 2721 rbuf[3] = last_lba; 2722 2723 /* sector size */ 2724 rbuf[4] = sector_size >> (8 * 3); 2725 rbuf[5] = sector_size >> (8 * 2); 2726 rbuf[6] = sector_size >> (8 * 1); 2727 rbuf[7] = sector_size; 2728 } else { 2729 /* sector count, 64-bit */ 2730 rbuf[0] = last_lba >> (8 * 7); 2731 rbuf[1] = last_lba >> (8 * 6); 2732 rbuf[2] = last_lba >> (8 * 5); 2733 rbuf[3] = last_lba >> (8 * 4); 2734 rbuf[4] = last_lba >> (8 * 3); 2735 rbuf[5] = last_lba >> (8 * 2); 2736 rbuf[6] = last_lba >> (8 * 1); 2737 rbuf[7] = last_lba; 2738 2739 /* sector size */ 2740 rbuf[ 8] = sector_size >> (8 * 3); 2741 rbuf[ 9] = sector_size >> (8 * 2); 2742 rbuf[10] = sector_size >> (8 * 1); 2743 rbuf[11] = sector_size; 2744 2745 rbuf[12] = 0; 2746 rbuf[13] = log2_per_phys; 2747 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2748 rbuf[15] = lowest_aligned; 2749 2750 if (ata_id_has_trim(args->id) && 2751 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2752 rbuf[14] |= 0x80; /* LBPME */ 2753 2754 if (ata_id_has_zero_after_trim(args->id) && 2755 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2756 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2757 rbuf[14] |= 0x40; /* LBPRZ */ 2758 } 2759 } 2760 if (ata_id_zoned_cap(args->id) || 2761 args->dev->class == ATA_DEV_ZAC) 2762 rbuf[12] = (1 << 4); /* RC_BASIS */ 2763 } 2764 return 0; 2765 } 2766 2767 /** 2768 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2769 * @args: device IDENTIFY data / SCSI command of interest. 2770 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2771 * 2772 * Simulate REPORT LUNS command. 2773 * 2774 * LOCKING: 2775 * spin_lock_irqsave(host lock) 2776 */ 2777 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2778 { 2779 VPRINTK("ENTER\n"); 2780 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2781 2782 return 0; 2783 } 2784 2785 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2786 { 2787 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2788 /* FIXME: not quite right; we don't want the 2789 * translation of taskfile registers into 2790 * a sense descriptors, since that's only 2791 * correct for ATA, not ATAPI 2792 */ 2793 ata_gen_passthru_sense(qc); 2794 } 2795 2796 ata_qc_done(qc); 2797 } 2798 2799 /* is it pointless to prefer PIO for "safety reasons"? */ 2800 static inline int ata_pio_use_silly(struct ata_port *ap) 2801 { 2802 return (ap->flags & ATA_FLAG_PIO_DMA); 2803 } 2804 2805 static void atapi_request_sense(struct ata_queued_cmd *qc) 2806 { 2807 struct ata_port *ap = qc->ap; 2808 struct scsi_cmnd *cmd = qc->scsicmd; 2809 2810 DPRINTK("ATAPI request sense\n"); 2811 2812 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2813 2814 #ifdef CONFIG_ATA_SFF 2815 if (ap->ops->sff_tf_read) 2816 ap->ops->sff_tf_read(ap, &qc->tf); 2817 #endif 2818 2819 /* fill these in, for the case where they are -not- overwritten */ 2820 cmd->sense_buffer[0] = 0x70; 2821 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2822 2823 ata_qc_reinit(qc); 2824 2825 /* setup sg table and init transfer direction */ 2826 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2827 ata_sg_init(qc, &qc->sgent, 1); 2828 qc->dma_dir = DMA_FROM_DEVICE; 2829 2830 memset(&qc->cdb, 0, qc->dev->cdb_len); 2831 qc->cdb[0] = REQUEST_SENSE; 2832 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2833 2834 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2835 qc->tf.command = ATA_CMD_PACKET; 2836 2837 if (ata_pio_use_silly(ap)) { 2838 qc->tf.protocol = ATAPI_PROT_DMA; 2839 qc->tf.feature |= ATAPI_PKT_DMA; 2840 } else { 2841 qc->tf.protocol = ATAPI_PROT_PIO; 2842 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2843 qc->tf.lbah = 0; 2844 } 2845 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2846 2847 qc->complete_fn = atapi_sense_complete; 2848 2849 ata_qc_issue(qc); 2850 2851 DPRINTK("EXIT\n"); 2852 } 2853 2854 /* 2855 * ATAPI devices typically report zero for their SCSI version, and sometimes 2856 * deviate from the spec WRT response data format. If SCSI version is 2857 * reported as zero like normal, then we make the following fixups: 2858 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a 2859 * modern device. 2860 * 2) Ensure response data format / ATAPI information are always correct. 2861 */ 2862 static void atapi_fixup_inquiry(struct scsi_cmnd *cmd) 2863 { 2864 u8 buf[4]; 2865 2866 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2867 if (buf[2] == 0) { 2868 buf[2] = 0x5; 2869 buf[3] = 0x32; 2870 } 2871 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); 2872 } 2873 2874 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2875 { 2876 struct scsi_cmnd *cmd = qc->scsicmd; 2877 unsigned int err_mask = qc->err_mask; 2878 2879 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2880 2881 /* handle completion from new EH */ 2882 if (unlikely(qc->ap->ops->error_handler && 2883 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2884 2885 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2886 /* FIXME: not quite right; we don't want the 2887 * translation of taskfile registers into a 2888 * sense descriptors, since that's only 2889 * correct for ATA, not ATAPI 2890 */ 2891 ata_gen_passthru_sense(qc); 2892 } 2893 2894 /* SCSI EH automatically locks door if sdev->locked is 2895 * set. Sometimes door lock request continues to 2896 * fail, for example, when no media is present. This 2897 * creates a loop - SCSI EH issues door lock which 2898 * fails and gets invoked again to acquire sense data 2899 * for the failed command. 2900 * 2901 * If door lock fails, always clear sdev->locked to 2902 * avoid this infinite loop. 2903 * 2904 * This may happen before SCSI scan is complete. Make 2905 * sure qc->dev->sdev isn't NULL before dereferencing. 2906 */ 2907 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2908 qc->dev->sdev->locked = 0; 2909 2910 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2911 ata_qc_done(qc); 2912 return; 2913 } 2914 2915 /* successful completion or old EH failure path */ 2916 if (unlikely(err_mask & AC_ERR_DEV)) { 2917 cmd->result = SAM_STAT_CHECK_CONDITION; 2918 atapi_request_sense(qc); 2919 return; 2920 } else if (unlikely(err_mask)) { 2921 /* FIXME: not quite right; we don't want the 2922 * translation of taskfile registers into 2923 * a sense descriptors, since that's only 2924 * correct for ATA, not ATAPI 2925 */ 2926 ata_gen_passthru_sense(qc); 2927 } else { 2928 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0) 2929 atapi_fixup_inquiry(cmd); 2930 cmd->result = SAM_STAT_GOOD; 2931 } 2932 2933 ata_qc_done(qc); 2934 } 2935 /** 2936 * atapi_xlat - Initialize PACKET taskfile 2937 * @qc: command structure to be initialized 2938 * 2939 * LOCKING: 2940 * spin_lock_irqsave(host lock) 2941 * 2942 * RETURNS: 2943 * Zero on success, non-zero on failure. 2944 */ 2945 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2946 { 2947 struct scsi_cmnd *scmd = qc->scsicmd; 2948 struct ata_device *dev = qc->dev; 2949 int nodata = (scmd->sc_data_direction == DMA_NONE); 2950 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2951 unsigned int nbytes; 2952 2953 memset(qc->cdb, 0, dev->cdb_len); 2954 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2955 2956 qc->complete_fn = atapi_qc_complete; 2957 2958 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2959 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2960 qc->tf.flags |= ATA_TFLAG_WRITE; 2961 DPRINTK("direction: write\n"); 2962 } 2963 2964 qc->tf.command = ATA_CMD_PACKET; 2965 ata_qc_set_pc_nbytes(qc); 2966 2967 /* check whether ATAPI DMA is safe */ 2968 if (!nodata && !using_pio && atapi_check_dma(qc)) 2969 using_pio = 1; 2970 2971 /* Some controller variants snoop this value for Packet 2972 * transfers to do state machine and FIFO management. Thus we 2973 * want to set it properly, and for DMA where it is 2974 * effectively meaningless. 2975 */ 2976 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2977 2978 /* Most ATAPI devices which honor transfer chunk size don't 2979 * behave according to the spec when odd chunk size which 2980 * matches the transfer length is specified. If the number of 2981 * bytes to transfer is 2n+1. According to the spec, what 2982 * should happen is to indicate that 2n+1 is going to be 2983 * transferred and transfer 2n+2 bytes where the last byte is 2984 * padding. 2985 * 2986 * In practice, this doesn't happen. ATAPI devices first 2987 * indicate and transfer 2n bytes and then indicate and 2988 * transfer 2 bytes where the last byte is padding. 2989 * 2990 * This inconsistency confuses several controllers which 2991 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2992 * These controllers use actual number of transferred bytes to 2993 * update DMA poitner and transfer of 4n+2 bytes make those 2994 * controller push DMA pointer by 4n+4 bytes because SATA data 2995 * FISes are aligned to 4 bytes. This causes data corruption 2996 * and buffer overrun. 2997 * 2998 * Always setting nbytes to even number solves this problem 2999 * because then ATAPI devices don't have to split data at 2n 3000 * boundaries. 3001 */ 3002 if (nbytes & 0x1) 3003 nbytes++; 3004 3005 qc->tf.lbam = (nbytes & 0xFF); 3006 qc->tf.lbah = (nbytes >> 8); 3007 3008 if (nodata) 3009 qc->tf.protocol = ATAPI_PROT_NODATA; 3010 else if (using_pio) 3011 qc->tf.protocol = ATAPI_PROT_PIO; 3012 else { 3013 /* DMA data xfer */ 3014 qc->tf.protocol = ATAPI_PROT_DMA; 3015 qc->tf.feature |= ATAPI_PKT_DMA; 3016 3017 if ((dev->flags & ATA_DFLAG_DMADIR) && 3018 (scmd->sc_data_direction != DMA_TO_DEVICE)) 3019 /* some SATA bridges need us to indicate data xfer direction */ 3020 qc->tf.feature |= ATAPI_DMADIR; 3021 } 3022 3023 3024 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 3025 as ATAPI tape drives don't get this right otherwise */ 3026 return 0; 3027 } 3028 3029 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 3030 { 3031 if (!sata_pmp_attached(ap)) { 3032 if (likely(devno >= 0 && 3033 devno < ata_link_max_devices(&ap->link))) 3034 return &ap->link.device[devno]; 3035 } else { 3036 if (likely(devno >= 0 && 3037 devno < ap->nr_pmp_links)) 3038 return &ap->pmp_link[devno].device[0]; 3039 } 3040 3041 return NULL; 3042 } 3043 3044 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 3045 const struct scsi_device *scsidev) 3046 { 3047 int devno; 3048 3049 /* skip commands not addressed to targets we simulate */ 3050 if (!sata_pmp_attached(ap)) { 3051 if (unlikely(scsidev->channel || scsidev->lun)) 3052 return NULL; 3053 devno = scsidev->id; 3054 } else { 3055 if (unlikely(scsidev->id || scsidev->lun)) 3056 return NULL; 3057 devno = scsidev->channel; 3058 } 3059 3060 return ata_find_dev(ap, devno); 3061 } 3062 3063 /** 3064 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 3065 * @ap: ATA port to which the device is attached 3066 * @scsidev: SCSI device from which we derive the ATA device 3067 * 3068 * Given various information provided in struct scsi_cmnd, 3069 * map that onto an ATA bus, and using that mapping 3070 * determine which ata_device is associated with the 3071 * SCSI command to be sent. 3072 * 3073 * LOCKING: 3074 * spin_lock_irqsave(host lock) 3075 * 3076 * RETURNS: 3077 * Associated ATA device, or %NULL if not found. 3078 */ 3079 static struct ata_device * 3080 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 3081 { 3082 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 3083 3084 if (unlikely(!dev || !ata_dev_enabled(dev))) 3085 return NULL; 3086 3087 return dev; 3088 } 3089 3090 /* 3091 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 3092 * @byte1: Byte 1 from pass-thru CDB. 3093 * 3094 * RETURNS: 3095 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 3096 */ 3097 static u8 3098 ata_scsi_map_proto(u8 byte1) 3099 { 3100 switch((byte1 & 0x1e) >> 1) { 3101 case 3: /* Non-data */ 3102 return ATA_PROT_NODATA; 3103 3104 case 6: /* DMA */ 3105 case 10: /* UDMA Data-in */ 3106 case 11: /* UDMA Data-Out */ 3107 return ATA_PROT_DMA; 3108 3109 case 4: /* PIO Data-in */ 3110 case 5: /* PIO Data-out */ 3111 return ATA_PROT_PIO; 3112 3113 case 12: /* FPDMA */ 3114 return ATA_PROT_NCQ; 3115 3116 case 0: /* Hard Reset */ 3117 case 1: /* SRST */ 3118 case 8: /* Device Diagnostic */ 3119 case 9: /* Device Reset */ 3120 case 7: /* DMA Queued */ 3121 case 15: /* Return Response Info */ 3122 default: /* Reserved */ 3123 break; 3124 } 3125 3126 return ATA_PROT_UNKNOWN; 3127 } 3128 3129 /** 3130 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 3131 * @qc: command structure to be initialized 3132 * 3133 * Handles either 12, 16, or 32-byte versions of the CDB. 3134 * 3135 * RETURNS: 3136 * Zero on success, non-zero on failure. 3137 */ 3138 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 3139 { 3140 struct ata_taskfile *tf = &(qc->tf); 3141 struct scsi_cmnd *scmd = qc->scsicmd; 3142 struct ata_device *dev = qc->dev; 3143 const u8 *cdb = scmd->cmnd; 3144 u16 fp; 3145 u16 cdb_offset = 0; 3146 3147 /* 7Fh variable length cmd means a ata pass-thru(32) */ 3148 if (cdb[0] == VARIABLE_LENGTH_CMD) 3149 cdb_offset = 9; 3150 3151 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]); 3152 if (tf->protocol == ATA_PROT_UNKNOWN) { 3153 fp = 1; 3154 goto invalid_fld; 3155 } 3156 3157 if (ata_is_ncq(tf->protocol) && (cdb[2 + cdb_offset] & 0x3) == 0) 3158 tf->protocol = ATA_PROT_NCQ_NODATA; 3159 3160 /* enable LBA */ 3161 tf->flags |= ATA_TFLAG_LBA; 3162 3163 /* 3164 * 12 and 16 byte CDBs use different offsets to 3165 * provide the various register values. 3166 */ 3167 if (cdb[0] == ATA_16) { 3168 /* 3169 * 16-byte CDB - may contain extended commands. 3170 * 3171 * If that is the case, copy the upper byte register values. 3172 */ 3173 if (cdb[1] & 0x01) { 3174 tf->hob_feature = cdb[3]; 3175 tf->hob_nsect = cdb[5]; 3176 tf->hob_lbal = cdb[7]; 3177 tf->hob_lbam = cdb[9]; 3178 tf->hob_lbah = cdb[11]; 3179 tf->flags |= ATA_TFLAG_LBA48; 3180 } else 3181 tf->flags &= ~ATA_TFLAG_LBA48; 3182 3183 /* 3184 * Always copy low byte, device and command registers. 3185 */ 3186 tf->feature = cdb[4]; 3187 tf->nsect = cdb[6]; 3188 tf->lbal = cdb[8]; 3189 tf->lbam = cdb[10]; 3190 tf->lbah = cdb[12]; 3191 tf->device = cdb[13]; 3192 tf->command = cdb[14]; 3193 } else if (cdb[0] == ATA_12) { 3194 /* 3195 * 12-byte CDB - incapable of extended commands. 3196 */ 3197 tf->flags &= ~ATA_TFLAG_LBA48; 3198 3199 tf->feature = cdb[3]; 3200 tf->nsect = cdb[4]; 3201 tf->lbal = cdb[5]; 3202 tf->lbam = cdb[6]; 3203 tf->lbah = cdb[7]; 3204 tf->device = cdb[8]; 3205 tf->command = cdb[9]; 3206 } else { 3207 /* 3208 * 32-byte CDB - may contain extended command fields. 3209 * 3210 * If that is the case, copy the upper byte register values. 3211 */ 3212 if (cdb[10] & 0x01) { 3213 tf->hob_feature = cdb[20]; 3214 tf->hob_nsect = cdb[22]; 3215 tf->hob_lbal = cdb[16]; 3216 tf->hob_lbam = cdb[15]; 3217 tf->hob_lbah = cdb[14]; 3218 tf->flags |= ATA_TFLAG_LBA48; 3219 } else 3220 tf->flags &= ~ATA_TFLAG_LBA48; 3221 3222 tf->feature = cdb[21]; 3223 tf->nsect = cdb[23]; 3224 tf->lbal = cdb[19]; 3225 tf->lbam = cdb[18]; 3226 tf->lbah = cdb[17]; 3227 tf->device = cdb[24]; 3228 tf->command = cdb[25]; 3229 tf->auxiliary = get_unaligned_be32(&cdb[28]); 3230 } 3231 3232 /* For NCQ commands copy the tag value */ 3233 if (ata_is_ncq(tf->protocol)) 3234 tf->nsect = qc->hw_tag << 3; 3235 3236 /* enforce correct master/slave bit */ 3237 tf->device = dev->devno ? 3238 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 3239 3240 switch (tf->command) { 3241 /* READ/WRITE LONG use a non-standard sect_size */ 3242 case ATA_CMD_READ_LONG: 3243 case ATA_CMD_READ_LONG_ONCE: 3244 case ATA_CMD_WRITE_LONG: 3245 case ATA_CMD_WRITE_LONG_ONCE: 3246 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) { 3247 fp = 1; 3248 goto invalid_fld; 3249 } 3250 qc->sect_size = scsi_bufflen(scmd); 3251 break; 3252 3253 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 3254 case ATA_CMD_CFA_WRITE_NE: 3255 case ATA_CMD_CFA_TRANS_SECT: 3256 case ATA_CMD_CFA_WRITE_MULT_NE: 3257 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 3258 case ATA_CMD_READ: 3259 case ATA_CMD_READ_EXT: 3260 case ATA_CMD_READ_QUEUED: 3261 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 3262 case ATA_CMD_FPDMA_READ: 3263 case ATA_CMD_READ_MULTI: 3264 case ATA_CMD_READ_MULTI_EXT: 3265 case ATA_CMD_PIO_READ: 3266 case ATA_CMD_PIO_READ_EXT: 3267 case ATA_CMD_READ_STREAM_DMA_EXT: 3268 case ATA_CMD_READ_STREAM_EXT: 3269 case ATA_CMD_VERIFY: 3270 case ATA_CMD_VERIFY_EXT: 3271 case ATA_CMD_WRITE: 3272 case ATA_CMD_WRITE_EXT: 3273 case ATA_CMD_WRITE_FUA_EXT: 3274 case ATA_CMD_WRITE_QUEUED: 3275 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 3276 case ATA_CMD_FPDMA_WRITE: 3277 case ATA_CMD_WRITE_MULTI: 3278 case ATA_CMD_WRITE_MULTI_EXT: 3279 case ATA_CMD_WRITE_MULTI_FUA_EXT: 3280 case ATA_CMD_PIO_WRITE: 3281 case ATA_CMD_PIO_WRITE_EXT: 3282 case ATA_CMD_WRITE_STREAM_DMA_EXT: 3283 case ATA_CMD_WRITE_STREAM_EXT: 3284 qc->sect_size = scmd->device->sector_size; 3285 break; 3286 3287 /* Everything else uses 512 byte "sectors" */ 3288 default: 3289 qc->sect_size = ATA_SECT_SIZE; 3290 } 3291 3292 /* 3293 * Set flags so that all registers will be written, pass on 3294 * write indication (used for PIO/DMA setup), result TF is 3295 * copied back and we don't whine too much about its failure. 3296 */ 3297 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3298 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3299 tf->flags |= ATA_TFLAG_WRITE; 3300 3301 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3302 3303 /* 3304 * Set transfer length. 3305 * 3306 * TODO: find out if we need to do more here to 3307 * cover scatter/gather case. 3308 */ 3309 ata_qc_set_pc_nbytes(qc); 3310 3311 /* We may not issue DMA commands if no DMA mode is set */ 3312 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) { 3313 fp = 1; 3314 goto invalid_fld; 3315 } 3316 3317 /* We may not issue NCQ commands to devices not supporting NCQ */ 3318 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) { 3319 fp = 1; 3320 goto invalid_fld; 3321 } 3322 3323 /* sanity check for pio multi commands */ 3324 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) { 3325 fp = 1; 3326 goto invalid_fld; 3327 } 3328 3329 if (is_multi_taskfile(tf)) { 3330 unsigned int multi_count = 1 << (cdb[1] >> 5); 3331 3332 /* compare the passed through multi_count 3333 * with the cached multi_count of libata 3334 */ 3335 if (multi_count != dev->multi_count) 3336 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3337 multi_count); 3338 } 3339 3340 /* 3341 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3342 * SET_FEATURES - XFER MODE must be preceded/succeeded 3343 * by an update to hardware-specific registers for each 3344 * controller (i.e. the reason for ->set_piomode(), 3345 * ->set_dmamode(), and ->post_set_mode() hooks). 3346 */ 3347 if (tf->command == ATA_CMD_SET_FEATURES && 3348 tf->feature == SETFEATURES_XFER) { 3349 fp = (cdb[0] == ATA_16) ? 4 : 3; 3350 goto invalid_fld; 3351 } 3352 3353 /* 3354 * Filter TPM commands by default. These provide an 3355 * essentially uncontrolled encrypted "back door" between 3356 * applications and the disk. Set libata.allow_tpm=1 if you 3357 * have a real reason for wanting to use them. This ensures 3358 * that installed software cannot easily mess stuff up without 3359 * user intent. DVR type users will probably ship with this enabled 3360 * for movie content management. 3361 * 3362 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3363 * for this and should do in future but that it is not sufficient as 3364 * DCS is an optional feature set. Thus we also do the software filter 3365 * so that we comply with the TC consortium stated goal that the user 3366 * can turn off TC features of their system. 3367 */ 3368 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) { 3369 fp = (cdb[0] == ATA_16) ? 14 : 9; 3370 goto invalid_fld; 3371 } 3372 3373 return 0; 3374 3375 invalid_fld: 3376 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff); 3377 return 1; 3378 } 3379 3380 /** 3381 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim 3382 * @cmd: SCSI command being translated 3383 * @trmax: Maximum number of entries that will fit in sector_size bytes. 3384 * @sector: Starting sector 3385 * @count: Total Range of request in logical sectors 3386 * 3387 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted 3388 * descriptor. 3389 * 3390 * Upto 64 entries of the format: 3391 * 63:48 Range Length 3392 * 47:0 LBA 3393 * 3394 * Range Length of 0 is ignored. 3395 * LBA's should be sorted order and not overlap. 3396 * 3397 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET 3398 * 3399 * Return: Number of bytes copied into sglist. 3400 */ 3401 static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax, 3402 u64 sector, u32 count) 3403 { 3404 struct scsi_device *sdp = cmd->device; 3405 size_t len = sdp->sector_size; 3406 size_t r; 3407 __le64 *buf; 3408 u32 i = 0; 3409 unsigned long flags; 3410 3411 WARN_ON(len > ATA_SCSI_RBUF_SIZE); 3412 3413 if (len > ATA_SCSI_RBUF_SIZE) 3414 len = ATA_SCSI_RBUF_SIZE; 3415 3416 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); 3417 buf = ((void *)ata_scsi_rbuf); 3418 memset(buf, 0, len); 3419 while (i < trmax) { 3420 u64 entry = sector | 3421 ((u64)(count > 0xffff ? 0xffff : count) << 48); 3422 buf[i++] = __cpu_to_le64(entry); 3423 if (count <= 0xffff) 3424 break; 3425 count -= 0xffff; 3426 sector += 0xffff; 3427 } 3428 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len); 3429 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); 3430 3431 return r; 3432 } 3433 3434 /** 3435 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same 3436 * @qc: Command to be translated 3437 * 3438 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or 3439 * an SCT Write Same command. 3440 * Based on WRITE SAME has the UNMAP flag: 3441 * 3442 * - When set translate to DSM TRIM 3443 * - When clear translate to SCT Write Same 3444 */ 3445 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3446 { 3447 struct ata_taskfile *tf = &qc->tf; 3448 struct scsi_cmnd *scmd = qc->scsicmd; 3449 struct scsi_device *sdp = scmd->device; 3450 size_t len = sdp->sector_size; 3451 struct ata_device *dev = qc->dev; 3452 const u8 *cdb = scmd->cmnd; 3453 u64 block; 3454 u32 n_block; 3455 const u32 trmax = len >> 3; 3456 u32 size; 3457 u16 fp; 3458 u8 bp = 0xff; 3459 u8 unmap = cdb[1] & 0x8; 3460 3461 /* we may not issue DMA commands if no DMA mode is set */ 3462 if (unlikely(!dev->dma_mode)) 3463 goto invalid_opcode; 3464 3465 /* 3466 * We only allow sending this command through the block layer, 3467 * as it modifies the DATA OUT buffer, which would corrupt user 3468 * memory for SG_IO commands. 3469 */ 3470 if (unlikely(blk_rq_is_passthrough(scmd->request))) 3471 goto invalid_opcode; 3472 3473 if (unlikely(scmd->cmd_len < 16)) { 3474 fp = 15; 3475 goto invalid_fld; 3476 } 3477 scsi_16_lba_len(cdb, &block, &n_block); 3478 3479 if (!unmap || 3480 (dev->horkage & ATA_HORKAGE_NOTRIM) || 3481 !ata_id_has_trim(dev->id)) { 3482 fp = 1; 3483 bp = 3; 3484 goto invalid_fld; 3485 } 3486 /* If the request is too large the cmd is invalid */ 3487 if (n_block > 0xffff * trmax) { 3488 fp = 2; 3489 goto invalid_fld; 3490 } 3491 3492 /* 3493 * WRITE SAME always has a sector sized buffer as payload, this 3494 * should never be a multiple entry S/G list. 3495 */ 3496 if (!scsi_sg_count(scmd)) 3497 goto invalid_param_len; 3498 3499 /* 3500 * size must match sector size in bytes 3501 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count) 3502 * is defined as number of 512 byte blocks to be transferred. 3503 */ 3504 3505 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); 3506 if (size != len) 3507 goto invalid_param_len; 3508 3509 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3510 /* Newer devices support queued TRIM commands */ 3511 tf->protocol = ATA_PROT_NCQ; 3512 tf->command = ATA_CMD_FPDMA_SEND; 3513 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3514 tf->nsect = qc->hw_tag << 3; 3515 tf->hob_feature = (size / 512) >> 8; 3516 tf->feature = size / 512; 3517 3518 tf->auxiliary = 1; 3519 } else { 3520 tf->protocol = ATA_PROT_DMA; 3521 tf->hob_feature = 0; 3522 tf->feature = ATA_DSM_TRIM; 3523 tf->hob_nsect = (size / 512) >> 8; 3524 tf->nsect = size / 512; 3525 tf->command = ATA_CMD_DSM; 3526 } 3527 3528 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3529 ATA_TFLAG_WRITE; 3530 3531 ata_qc_set_pc_nbytes(qc); 3532 3533 return 0; 3534 3535 invalid_fld: 3536 ata_scsi_set_invalid_field(dev, scmd, fp, bp); 3537 return 1; 3538 invalid_param_len: 3539 /* "Parameter list length error" */ 3540 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3541 return 1; 3542 invalid_opcode: 3543 /* "Invalid command operation code" */ 3544 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0); 3545 return 1; 3546 } 3547 3548 /** 3549 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN 3550 * @args: device MAINTENANCE_IN data / SCSI command of interest. 3551 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 3552 * 3553 * Yields a subset to satisfy scsi_report_opcode() 3554 * 3555 * LOCKING: 3556 * spin_lock_irqsave(host lock) 3557 */ 3558 static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf) 3559 { 3560 struct ata_device *dev = args->dev; 3561 u8 *cdb = args->cmd->cmnd; 3562 u8 supported = 0; 3563 unsigned int err = 0; 3564 3565 if (cdb[2] != 1) { 3566 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]); 3567 err = 2; 3568 goto out; 3569 } 3570 switch (cdb[3]) { 3571 case INQUIRY: 3572 case MODE_SENSE: 3573 case MODE_SENSE_10: 3574 case READ_CAPACITY: 3575 case SERVICE_ACTION_IN_16: 3576 case REPORT_LUNS: 3577 case REQUEST_SENSE: 3578 case SYNCHRONIZE_CACHE: 3579 case REZERO_UNIT: 3580 case SEEK_6: 3581 case SEEK_10: 3582 case TEST_UNIT_READY: 3583 case SEND_DIAGNOSTIC: 3584 case MAINTENANCE_IN: 3585 case READ_6: 3586 case READ_10: 3587 case READ_16: 3588 case WRITE_6: 3589 case WRITE_10: 3590 case WRITE_16: 3591 case ATA_12: 3592 case ATA_16: 3593 case VERIFY: 3594 case VERIFY_16: 3595 case MODE_SELECT: 3596 case MODE_SELECT_10: 3597 case START_STOP: 3598 supported = 3; 3599 break; 3600 case ZBC_IN: 3601 case ZBC_OUT: 3602 if (ata_id_zoned_cap(dev->id) || 3603 dev->class == ATA_DEV_ZAC) 3604 supported = 3; 3605 break; 3606 case SECURITY_PROTOCOL_IN: 3607 case SECURITY_PROTOCOL_OUT: 3608 if (dev->flags & ATA_DFLAG_TRUSTED) 3609 supported = 3; 3610 break; 3611 default: 3612 break; 3613 } 3614 out: 3615 rbuf[1] = supported; /* supported */ 3616 return err; 3617 } 3618 3619 /** 3620 * ata_scsi_report_zones_complete - convert ATA output 3621 * @qc: command structure returning the data 3622 * 3623 * Convert T-13 little-endian field representation into 3624 * T-10 big-endian field representation. 3625 * What a mess. 3626 */ 3627 static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc) 3628 { 3629 struct scsi_cmnd *scmd = qc->scsicmd; 3630 struct sg_mapping_iter miter; 3631 unsigned long flags; 3632 unsigned int bytes = 0; 3633 3634 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd), 3635 SG_MITER_TO_SG | SG_MITER_ATOMIC); 3636 3637 local_irq_save(flags); 3638 while (sg_miter_next(&miter)) { 3639 unsigned int offset = 0; 3640 3641 if (bytes == 0) { 3642 char *hdr; 3643 u32 list_length; 3644 u64 max_lba, opt_lba; 3645 u16 same; 3646 3647 /* Swizzle header */ 3648 hdr = miter.addr; 3649 list_length = get_unaligned_le32(&hdr[0]); 3650 same = get_unaligned_le16(&hdr[4]); 3651 max_lba = get_unaligned_le64(&hdr[8]); 3652 opt_lba = get_unaligned_le64(&hdr[16]); 3653 put_unaligned_be32(list_length, &hdr[0]); 3654 hdr[4] = same & 0xf; 3655 put_unaligned_be64(max_lba, &hdr[8]); 3656 put_unaligned_be64(opt_lba, &hdr[16]); 3657 offset += 64; 3658 bytes += 64; 3659 } 3660 while (offset < miter.length) { 3661 char *rec; 3662 u8 cond, type, non_seq, reset; 3663 u64 size, start, wp; 3664 3665 /* Swizzle zone descriptor */ 3666 rec = miter.addr + offset; 3667 type = rec[0] & 0xf; 3668 cond = (rec[1] >> 4) & 0xf; 3669 non_seq = (rec[1] & 2); 3670 reset = (rec[1] & 1); 3671 size = get_unaligned_le64(&rec[8]); 3672 start = get_unaligned_le64(&rec[16]); 3673 wp = get_unaligned_le64(&rec[24]); 3674 rec[0] = type; 3675 rec[1] = (cond << 4) | non_seq | reset; 3676 put_unaligned_be64(size, &rec[8]); 3677 put_unaligned_be64(start, &rec[16]); 3678 put_unaligned_be64(wp, &rec[24]); 3679 WARN_ON(offset + 64 > miter.length); 3680 offset += 64; 3681 bytes += 64; 3682 } 3683 } 3684 sg_miter_stop(&miter); 3685 local_irq_restore(flags); 3686 3687 ata_scsi_qc_complete(qc); 3688 } 3689 3690 static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc) 3691 { 3692 struct ata_taskfile *tf = &qc->tf; 3693 struct scsi_cmnd *scmd = qc->scsicmd; 3694 const u8 *cdb = scmd->cmnd; 3695 u16 sect, fp = (u16)-1; 3696 u8 sa, options, bp = 0xff; 3697 u64 block; 3698 u32 n_block; 3699 3700 if (unlikely(scmd->cmd_len < 16)) { 3701 ata_dev_warn(qc->dev, "invalid cdb length %d\n", 3702 scmd->cmd_len); 3703 fp = 15; 3704 goto invalid_fld; 3705 } 3706 scsi_16_lba_len(cdb, &block, &n_block); 3707 if (n_block != scsi_bufflen(scmd)) { 3708 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n", 3709 n_block, scsi_bufflen(scmd)); 3710 goto invalid_param_len; 3711 } 3712 sa = cdb[1] & 0x1f; 3713 if (sa != ZI_REPORT_ZONES) { 3714 ata_dev_warn(qc->dev, "invalid service action %d\n", sa); 3715 fp = 1; 3716 goto invalid_fld; 3717 } 3718 /* 3719 * ZAC allows only for transfers in 512 byte blocks, 3720 * and uses a 16 bit value for the transfer count. 3721 */ 3722 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) { 3723 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block); 3724 goto invalid_param_len; 3725 } 3726 sect = n_block / 512; 3727 options = cdb[14] & 0xbf; 3728 3729 if (ata_ncq_enabled(qc->dev) && 3730 ata_fpdma_zac_mgmt_in_supported(qc->dev)) { 3731 tf->protocol = ATA_PROT_NCQ; 3732 tf->command = ATA_CMD_FPDMA_RECV; 3733 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f; 3734 tf->nsect = qc->hw_tag << 3; 3735 tf->feature = sect & 0xff; 3736 tf->hob_feature = (sect >> 8) & 0xff; 3737 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8); 3738 } else { 3739 tf->command = ATA_CMD_ZAC_MGMT_IN; 3740 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES; 3741 tf->protocol = ATA_PROT_DMA; 3742 tf->hob_feature = options; 3743 tf->hob_nsect = (sect >> 8) & 0xff; 3744 tf->nsect = sect & 0xff; 3745 } 3746 tf->device = ATA_LBA; 3747 tf->lbah = (block >> 16) & 0xff; 3748 tf->lbam = (block >> 8) & 0xff; 3749 tf->lbal = block & 0xff; 3750 tf->hob_lbah = (block >> 40) & 0xff; 3751 tf->hob_lbam = (block >> 32) & 0xff; 3752 tf->hob_lbal = (block >> 24) & 0xff; 3753 3754 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3755 qc->flags |= ATA_QCFLAG_RESULT_TF; 3756 3757 ata_qc_set_pc_nbytes(qc); 3758 3759 qc->complete_fn = ata_scsi_report_zones_complete; 3760 3761 return 0; 3762 3763 invalid_fld: 3764 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 3765 return 1; 3766 3767 invalid_param_len: 3768 /* "Parameter list length error" */ 3769 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3770 return 1; 3771 } 3772 3773 static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc) 3774 { 3775 struct ata_taskfile *tf = &qc->tf; 3776 struct scsi_cmnd *scmd = qc->scsicmd; 3777 struct ata_device *dev = qc->dev; 3778 const u8 *cdb = scmd->cmnd; 3779 u8 all, sa; 3780 u64 block; 3781 u32 n_block; 3782 u16 fp = (u16)-1; 3783 3784 if (unlikely(scmd->cmd_len < 16)) { 3785 fp = 15; 3786 goto invalid_fld; 3787 } 3788 3789 sa = cdb[1] & 0x1f; 3790 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) && 3791 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) { 3792 fp = 1; 3793 goto invalid_fld; 3794 } 3795 3796 scsi_16_lba_len(cdb, &block, &n_block); 3797 if (n_block) { 3798 /* 3799 * ZAC MANAGEMENT OUT doesn't define any length 3800 */ 3801 goto invalid_param_len; 3802 } 3803 3804 all = cdb[14] & 0x1; 3805 if (all) { 3806 /* 3807 * Ignore the block address (zone ID) as defined by ZBC. 3808 */ 3809 block = 0; 3810 } else if (block >= dev->n_sectors) { 3811 /* 3812 * Block must be a valid zone ID (a zone start LBA). 3813 */ 3814 fp = 2; 3815 goto invalid_fld; 3816 } 3817 3818 if (ata_ncq_enabled(qc->dev) && 3819 ata_fpdma_zac_mgmt_out_supported(qc->dev)) { 3820 tf->protocol = ATA_PROT_NCQ_NODATA; 3821 tf->command = ATA_CMD_NCQ_NON_DATA; 3822 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT; 3823 tf->nsect = qc->hw_tag << 3; 3824 tf->auxiliary = sa | ((u16)all << 8); 3825 } else { 3826 tf->protocol = ATA_PROT_NODATA; 3827 tf->command = ATA_CMD_ZAC_MGMT_OUT; 3828 tf->feature = sa; 3829 tf->hob_feature = all; 3830 } 3831 tf->lbah = (block >> 16) & 0xff; 3832 tf->lbam = (block >> 8) & 0xff; 3833 tf->lbal = block & 0xff; 3834 tf->hob_lbah = (block >> 40) & 0xff; 3835 tf->hob_lbam = (block >> 32) & 0xff; 3836 tf->hob_lbal = (block >> 24) & 0xff; 3837 tf->device = ATA_LBA; 3838 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 3839 3840 return 0; 3841 3842 invalid_fld: 3843 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); 3844 return 1; 3845 invalid_param_len: 3846 /* "Parameter list length error" */ 3847 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3848 return 1; 3849 } 3850 3851 /** 3852 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3853 * @qc: Storage for translated ATA taskfile 3854 * @buf: input buffer 3855 * @len: number of valid bytes in the input buffer 3856 * @fp: out parameter for the failed field on error 3857 * 3858 * Prepare a taskfile to modify caching information for the device. 3859 * 3860 * LOCKING: 3861 * None. 3862 */ 3863 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3864 const u8 *buf, int len, u16 *fp) 3865 { 3866 struct ata_taskfile *tf = &qc->tf; 3867 struct ata_device *dev = qc->dev; 3868 u8 mpage[CACHE_MPAGE_LEN]; 3869 u8 wce; 3870 int i; 3871 3872 /* 3873 * The first two bytes of def_cache_mpage are a header, so offsets 3874 * in mpage are off by 2 compared to buf. Same for len. 3875 */ 3876 3877 if (len != CACHE_MPAGE_LEN - 2) { 3878 if (len < CACHE_MPAGE_LEN - 2) 3879 *fp = len; 3880 else 3881 *fp = CACHE_MPAGE_LEN - 2; 3882 return -EINVAL; 3883 } 3884 3885 wce = buf[0] & (1 << 2); 3886 3887 /* 3888 * Check that read-only bits are not modified. 3889 */ 3890 ata_msense_caching(dev->id, mpage, false); 3891 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) { 3892 if (i == 0) 3893 continue; 3894 if (mpage[i + 2] != buf[i]) { 3895 *fp = i; 3896 return -EINVAL; 3897 } 3898 } 3899 3900 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3901 tf->protocol = ATA_PROT_NODATA; 3902 tf->nsect = 0; 3903 tf->command = ATA_CMD_SET_FEATURES; 3904 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3905 return 0; 3906 } 3907 3908 /** 3909 * ata_mselect_control - Simulate MODE SELECT for control page 3910 * @qc: Storage for translated ATA taskfile 3911 * @buf: input buffer 3912 * @len: number of valid bytes in the input buffer 3913 * @fp: out parameter for the failed field on error 3914 * 3915 * Prepare a taskfile to modify caching information for the device. 3916 * 3917 * LOCKING: 3918 * None. 3919 */ 3920 static int ata_mselect_control(struct ata_queued_cmd *qc, 3921 const u8 *buf, int len, u16 *fp) 3922 { 3923 struct ata_device *dev = qc->dev; 3924 u8 mpage[CONTROL_MPAGE_LEN]; 3925 u8 d_sense; 3926 int i; 3927 3928 /* 3929 * The first two bytes of def_control_mpage are a header, so offsets 3930 * in mpage are off by 2 compared to buf. Same for len. 3931 */ 3932 3933 if (len != CONTROL_MPAGE_LEN - 2) { 3934 if (len < CONTROL_MPAGE_LEN - 2) 3935 *fp = len; 3936 else 3937 *fp = CONTROL_MPAGE_LEN - 2; 3938 return -EINVAL; 3939 } 3940 3941 d_sense = buf[0] & (1 << 2); 3942 3943 /* 3944 * Check that read-only bits are not modified. 3945 */ 3946 ata_msense_control(dev, mpage, false); 3947 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) { 3948 if (i == 0) 3949 continue; 3950 if (mpage[2 + i] != buf[i]) { 3951 *fp = i; 3952 return -EINVAL; 3953 } 3954 } 3955 if (d_sense & (1 << 2)) 3956 dev->flags |= ATA_DFLAG_D_SENSE; 3957 else 3958 dev->flags &= ~ATA_DFLAG_D_SENSE; 3959 return 0; 3960 } 3961 3962 /** 3963 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands 3964 * @qc: Storage for translated ATA taskfile 3965 * 3966 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3967 * Assume this is invoked for direct access devices (e.g. disks) only. 3968 * There should be no block descriptor for other device types. 3969 * 3970 * LOCKING: 3971 * spin_lock_irqsave(host lock) 3972 */ 3973 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3974 { 3975 struct scsi_cmnd *scmd = qc->scsicmd; 3976 const u8 *cdb = scmd->cmnd; 3977 const u8 *p; 3978 u8 pg, spg; 3979 unsigned six_byte, pg_len, hdr_len, bd_len; 3980 int len; 3981 u16 fp = (u16)-1; 3982 u8 bp = 0xff; 3983 3984 VPRINTK("ENTER\n"); 3985 3986 six_byte = (cdb[0] == MODE_SELECT); 3987 if (six_byte) { 3988 if (scmd->cmd_len < 5) { 3989 fp = 4; 3990 goto invalid_fld; 3991 } 3992 3993 len = cdb[4]; 3994 hdr_len = 4; 3995 } else { 3996 if (scmd->cmd_len < 9) { 3997 fp = 8; 3998 goto invalid_fld; 3999 } 4000 4001 len = (cdb[7] << 8) + cdb[8]; 4002 hdr_len = 8; 4003 } 4004 4005 /* We only support PF=1, SP=0. */ 4006 if ((cdb[1] & 0x11) != 0x10) { 4007 fp = 1; 4008 bp = (cdb[1] & 0x01) ? 1 : 5; 4009 goto invalid_fld; 4010 } 4011 4012 /* Test early for possible overrun. */ 4013 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 4014 goto invalid_param_len; 4015 4016 p = page_address(sg_page(scsi_sglist(scmd))); 4017 4018 /* Move past header and block descriptors. */ 4019 if (len < hdr_len) 4020 goto invalid_param_len; 4021 4022 if (six_byte) 4023 bd_len = p[3]; 4024 else 4025 bd_len = (p[6] << 8) + p[7]; 4026 4027 len -= hdr_len; 4028 p += hdr_len; 4029 if (len < bd_len) 4030 goto invalid_param_len; 4031 if (bd_len != 0 && bd_len != 8) { 4032 fp = (six_byte) ? 3 : 6; 4033 fp += bd_len + hdr_len; 4034 goto invalid_param; 4035 } 4036 4037 len -= bd_len; 4038 p += bd_len; 4039 if (len == 0) 4040 goto skip; 4041 4042 /* Parse both possible formats for the mode page headers. */ 4043 pg = p[0] & 0x3f; 4044 if (p[0] & 0x40) { 4045 if (len < 4) 4046 goto invalid_param_len; 4047 4048 spg = p[1]; 4049 pg_len = (p[2] << 8) | p[3]; 4050 p += 4; 4051 len -= 4; 4052 } else { 4053 if (len < 2) 4054 goto invalid_param_len; 4055 4056 spg = 0; 4057 pg_len = p[1]; 4058 p += 2; 4059 len -= 2; 4060 } 4061 4062 /* 4063 * No mode subpages supported (yet) but asking for _all_ 4064 * subpages may be valid 4065 */ 4066 if (spg && (spg != ALL_SUB_MPAGES)) { 4067 fp = (p[0] & 0x40) ? 1 : 0; 4068 fp += hdr_len + bd_len; 4069 goto invalid_param; 4070 } 4071 if (pg_len > len) 4072 goto invalid_param_len; 4073 4074 switch (pg) { 4075 case CACHE_MPAGE: 4076 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) { 4077 fp += hdr_len + bd_len; 4078 goto invalid_param; 4079 } 4080 break; 4081 case CONTROL_MPAGE: 4082 if (ata_mselect_control(qc, p, pg_len, &fp) < 0) { 4083 fp += hdr_len + bd_len; 4084 goto invalid_param; 4085 } else { 4086 goto skip; /* No ATA command to send */ 4087 } 4088 break; 4089 default: /* invalid page code */ 4090 fp = bd_len + hdr_len; 4091 goto invalid_param; 4092 } 4093 4094 /* 4095 * Only one page has changeable data, so we only support setting one 4096 * page at a time. 4097 */ 4098 if (len > pg_len) 4099 goto invalid_param; 4100 4101 return 0; 4102 4103 invalid_fld: 4104 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); 4105 return 1; 4106 4107 invalid_param: 4108 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp); 4109 return 1; 4110 4111 invalid_param_len: 4112 /* "Parameter list length error" */ 4113 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 4114 return 1; 4115 4116 skip: 4117 scmd->result = SAM_STAT_GOOD; 4118 return 1; 4119 } 4120 4121 static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma) 4122 { 4123 if (len == 0) 4124 return ATA_CMD_TRUSTED_NONDATA; 4125 else if (send) 4126 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND; 4127 else 4128 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV; 4129 } 4130 4131 static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc) 4132 { 4133 struct scsi_cmnd *scmd = qc->scsicmd; 4134 const u8 *cdb = scmd->cmnd; 4135 struct ata_taskfile *tf = &qc->tf; 4136 u8 secp = cdb[1]; 4137 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT); 4138 u16 spsp = get_unaligned_be16(&cdb[2]); 4139 u32 len = get_unaligned_be32(&cdb[6]); 4140 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO); 4141 4142 /* 4143 * We don't support the ATA "security" protocol. 4144 */ 4145 if (secp == 0xef) { 4146 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0); 4147 return 1; 4148 } 4149 4150 if (cdb[4] & 7) { /* INC_512 */ 4151 if (len > 0xffff) { 4152 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 4153 return 1; 4154 } 4155 } else { 4156 if (len > 0x01fffe00) { 4157 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); 4158 return 1; 4159 } 4160 4161 /* convert to the sector-based ATA addressing */ 4162 len = (len + 511) / 512; 4163 } 4164 4165 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO; 4166 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA; 4167 if (send) 4168 tf->flags |= ATA_TFLAG_WRITE; 4169 tf->command = ata_scsi_trusted_op(len, send, dma); 4170 tf->feature = secp; 4171 tf->lbam = spsp & 0xff; 4172 tf->lbah = spsp >> 8; 4173 4174 if (len) { 4175 tf->nsect = len & 0xff; 4176 tf->lbal = len >> 8; 4177 } else { 4178 if (!send) 4179 tf->lbah = (1 << 7); 4180 } 4181 4182 ata_qc_set_pc_nbytes(qc); 4183 return 0; 4184 } 4185 4186 /** 4187 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler 4188 * @qc: Command to be translated 4189 * 4190 * Translate a SCSI variable length CDB to specified commands. 4191 * It checks a service action value in CDB to call corresponding handler. 4192 * 4193 * RETURNS: 4194 * Zero on success, non-zero on failure 4195 * 4196 */ 4197 static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc) 4198 { 4199 struct scsi_cmnd *scmd = qc->scsicmd; 4200 const u8 *cdb = scmd->cmnd; 4201 const u16 sa = get_unaligned_be16(&cdb[8]); 4202 4203 /* 4204 * if service action represents a ata pass-thru(32) command, 4205 * then pass it to ata_scsi_pass_thru handler. 4206 */ 4207 if (sa == ATA_32) 4208 return ata_scsi_pass_thru(qc); 4209 4210 /* unsupported service action */ 4211 return 1; 4212 } 4213 4214 /** 4215 * ata_get_xlat_func - check if SCSI to ATA translation is possible 4216 * @dev: ATA device 4217 * @cmd: SCSI command opcode to consider 4218 * 4219 * Look up the SCSI command given, and determine whether the 4220 * SCSI command is to be translated or simulated. 4221 * 4222 * RETURNS: 4223 * Pointer to translation function if possible, %NULL if not. 4224 */ 4225 4226 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 4227 { 4228 switch (cmd) { 4229 case READ_6: 4230 case READ_10: 4231 case READ_16: 4232 4233 case WRITE_6: 4234 case WRITE_10: 4235 case WRITE_16: 4236 return ata_scsi_rw_xlat; 4237 4238 case WRITE_SAME_16: 4239 return ata_scsi_write_same_xlat; 4240 4241 case SYNCHRONIZE_CACHE: 4242 if (ata_try_flush_cache(dev)) 4243 return ata_scsi_flush_xlat; 4244 break; 4245 4246 case VERIFY: 4247 case VERIFY_16: 4248 return ata_scsi_verify_xlat; 4249 4250 case ATA_12: 4251 case ATA_16: 4252 return ata_scsi_pass_thru; 4253 4254 case VARIABLE_LENGTH_CMD: 4255 return ata_scsi_var_len_cdb_xlat; 4256 4257 case MODE_SELECT: 4258 case MODE_SELECT_10: 4259 return ata_scsi_mode_select_xlat; 4260 break; 4261 4262 case ZBC_IN: 4263 return ata_scsi_zbc_in_xlat; 4264 4265 case ZBC_OUT: 4266 return ata_scsi_zbc_out_xlat; 4267 4268 case SECURITY_PROTOCOL_IN: 4269 case SECURITY_PROTOCOL_OUT: 4270 if (!(dev->flags & ATA_DFLAG_TRUSTED)) 4271 break; 4272 return ata_scsi_security_inout_xlat; 4273 4274 case START_STOP: 4275 return ata_scsi_start_stop_xlat; 4276 } 4277 4278 return NULL; 4279 } 4280 4281 /** 4282 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 4283 * @ap: ATA port to which the command was being sent 4284 * @cmd: SCSI command to dump 4285 * 4286 * Prints the contents of a SCSI command via printk(). 4287 */ 4288 4289 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 4290 struct scsi_cmnd *cmd) 4291 { 4292 #ifdef ATA_VERBOSE_DEBUG 4293 struct scsi_device *scsidev = cmd->device; 4294 4295 VPRINTK("CDB (%u:%d,%d,%lld) %9ph\n", 4296 ap->print_id, 4297 scsidev->channel, scsidev->id, scsidev->lun, 4298 cmd->cmnd); 4299 #endif 4300 } 4301 4302 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 4303 struct ata_device *dev) 4304 { 4305 u8 scsi_op = scmd->cmnd[0]; 4306 ata_xlat_func_t xlat_func; 4307 int rc = 0; 4308 4309 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 4310 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 4311 goto bad_cdb_len; 4312 4313 xlat_func = ata_get_xlat_func(dev, scsi_op); 4314 } else { 4315 if (unlikely(!scmd->cmd_len)) 4316 goto bad_cdb_len; 4317 4318 xlat_func = NULL; 4319 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 4320 /* relay SCSI command to ATAPI device */ 4321 int len = COMMAND_SIZE(scsi_op); 4322 if (unlikely(len > scmd->cmd_len || 4323 len > dev->cdb_len || 4324 scmd->cmd_len > ATAPI_CDB_LEN)) 4325 goto bad_cdb_len; 4326 4327 xlat_func = atapi_xlat; 4328 } else { 4329 /* ATA_16 passthru, treat as an ATA command */ 4330 if (unlikely(scmd->cmd_len > 16)) 4331 goto bad_cdb_len; 4332 4333 xlat_func = ata_get_xlat_func(dev, scsi_op); 4334 } 4335 } 4336 4337 if (xlat_func) 4338 rc = ata_scsi_translate(dev, scmd, xlat_func); 4339 else 4340 ata_scsi_simulate(dev, scmd); 4341 4342 return rc; 4343 4344 bad_cdb_len: 4345 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 4346 scmd->cmd_len, scsi_op, dev->cdb_len); 4347 scmd->result = DID_ERROR << 16; 4348 scmd->scsi_done(scmd); 4349 return 0; 4350 } 4351 4352 /** 4353 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 4354 * @shost: SCSI host of command to be sent 4355 * @cmd: SCSI command to be sent 4356 * 4357 * In some cases, this function translates SCSI commands into 4358 * ATA taskfiles, and queues the taskfiles to be sent to 4359 * hardware. In other cases, this function simulates a 4360 * SCSI device by evaluating and responding to certain 4361 * SCSI commands. This creates the overall effect of 4362 * ATA and ATAPI devices appearing as SCSI devices. 4363 * 4364 * LOCKING: 4365 * ATA host lock 4366 * 4367 * RETURNS: 4368 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4369 * 0 otherwise. 4370 */ 4371 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 4372 { 4373 struct ata_port *ap; 4374 struct ata_device *dev; 4375 struct scsi_device *scsidev = cmd->device; 4376 int rc = 0; 4377 unsigned long irq_flags; 4378 4379 ap = ata_shost_to_port(shost); 4380 4381 spin_lock_irqsave(ap->lock, irq_flags); 4382 4383 ata_scsi_dump_cdb(ap, cmd); 4384 4385 dev = ata_scsi_find_dev(ap, scsidev); 4386 if (likely(dev)) 4387 rc = __ata_scsi_queuecmd(cmd, dev); 4388 else { 4389 cmd->result = (DID_BAD_TARGET << 16); 4390 cmd->scsi_done(cmd); 4391 } 4392 4393 spin_unlock_irqrestore(ap->lock, irq_flags); 4394 4395 return rc; 4396 } 4397 4398 /** 4399 * ata_scsi_simulate - simulate SCSI command on ATA device 4400 * @dev: the target device 4401 * @cmd: SCSI command being sent to device. 4402 * 4403 * Interprets and directly executes a select list of SCSI commands 4404 * that can be handled internally. 4405 * 4406 * LOCKING: 4407 * spin_lock_irqsave(host lock) 4408 */ 4409 4410 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 4411 { 4412 struct ata_scsi_args args; 4413 const u8 *scsicmd = cmd->cmnd; 4414 u8 tmp8; 4415 4416 args.dev = dev; 4417 args.id = dev->id; 4418 args.cmd = cmd; 4419 4420 switch(scsicmd[0]) { 4421 case INQUIRY: 4422 if (scsicmd[1] & 2) /* is CmdDt set? */ 4423 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4424 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 4425 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 4426 else switch (scsicmd[2]) { 4427 case 0x00: 4428 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 4429 break; 4430 case 0x80: 4431 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 4432 break; 4433 case 0x83: 4434 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 4435 break; 4436 case 0x89: 4437 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 4438 break; 4439 case 0xb0: 4440 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 4441 break; 4442 case 0xb1: 4443 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 4444 break; 4445 case 0xb2: 4446 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 4447 break; 4448 case 0xb6: 4449 if (dev->flags & ATA_DFLAG_ZAC) { 4450 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6); 4451 break; 4452 } 4453 /* Fallthrough */ 4454 default: 4455 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff); 4456 break; 4457 } 4458 break; 4459 4460 case MODE_SENSE: 4461 case MODE_SENSE_10: 4462 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 4463 break; 4464 4465 case READ_CAPACITY: 4466 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4467 break; 4468 4469 case SERVICE_ACTION_IN_16: 4470 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 4471 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 4472 else 4473 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4474 break; 4475 4476 case REPORT_LUNS: 4477 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 4478 break; 4479 4480 case REQUEST_SENSE: 4481 ata_scsi_set_sense(dev, cmd, 0, 0, 0); 4482 cmd->result = (DRIVER_SENSE << 24); 4483 break; 4484 4485 /* if we reach this, then writeback caching is disabled, 4486 * turning this into a no-op. 4487 */ 4488 case SYNCHRONIZE_CACHE: 4489 /* fall through */ 4490 4491 /* no-op's, complete with success */ 4492 case REZERO_UNIT: 4493 case SEEK_6: 4494 case SEEK_10: 4495 case TEST_UNIT_READY: 4496 break; 4497 4498 case SEND_DIAGNOSTIC: 4499 tmp8 = scsicmd[1] & ~(1 << 3); 4500 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4]) 4501 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4502 break; 4503 4504 case MAINTENANCE_IN: 4505 if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES) 4506 ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in); 4507 else 4508 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff); 4509 break; 4510 4511 /* all other commands */ 4512 default: 4513 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0); 4514 /* "Invalid command operation code" */ 4515 break; 4516 } 4517 4518 cmd->scsi_done(cmd); 4519 } 4520 4521 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 4522 { 4523 int i, rc; 4524 4525 for (i = 0; i < host->n_ports; i++) { 4526 struct ata_port *ap = host->ports[i]; 4527 struct Scsi_Host *shost; 4528 4529 rc = -ENOMEM; 4530 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 4531 if (!shost) 4532 goto err_alloc; 4533 4534 shost->eh_noresume = 1; 4535 *(struct ata_port **)&shost->hostdata[0] = ap; 4536 ap->scsi_host = shost; 4537 4538 shost->transportt = ata_scsi_transport_template; 4539 shost->unique_id = ap->print_id; 4540 shost->max_id = 16; 4541 shost->max_lun = 1; 4542 shost->max_channel = 1; 4543 shost->max_cmd_len = 32; 4544 4545 /* Schedule policy is determined by ->qc_defer() 4546 * callback and it needs to see every deferred qc. 4547 * Set host_blocked to 1 to prevent SCSI midlayer from 4548 * automatically deferring requests. 4549 */ 4550 shost->max_host_blocked = 1; 4551 4552 rc = scsi_add_host_with_dma(ap->scsi_host, 4553 &ap->tdev, ap->host->dev); 4554 if (rc) 4555 goto err_add; 4556 } 4557 4558 return 0; 4559 4560 err_add: 4561 scsi_host_put(host->ports[i]->scsi_host); 4562 err_alloc: 4563 while (--i >= 0) { 4564 struct Scsi_Host *shost = host->ports[i]->scsi_host; 4565 4566 scsi_remove_host(shost); 4567 scsi_host_put(shost); 4568 } 4569 return rc; 4570 } 4571 4572 void ata_scsi_scan_host(struct ata_port *ap, int sync) 4573 { 4574 int tries = 5; 4575 struct ata_device *last_failed_dev = NULL; 4576 struct ata_link *link; 4577 struct ata_device *dev; 4578 4579 repeat: 4580 ata_for_each_link(link, ap, EDGE) { 4581 ata_for_each_dev(dev, link, ENABLED) { 4582 struct scsi_device *sdev; 4583 int channel = 0, id = 0; 4584 4585 if (dev->sdev) 4586 continue; 4587 4588 if (ata_is_host_link(link)) 4589 id = dev->devno; 4590 else 4591 channel = link->pmp; 4592 4593 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 4594 NULL); 4595 if (!IS_ERR(sdev)) { 4596 dev->sdev = sdev; 4597 scsi_device_put(sdev); 4598 } else { 4599 dev->sdev = NULL; 4600 } 4601 } 4602 } 4603 4604 /* If we scanned while EH was in progress or allocation 4605 * failure occurred, scan would have failed silently. Check 4606 * whether all devices are attached. 4607 */ 4608 ata_for_each_link(link, ap, EDGE) { 4609 ata_for_each_dev(dev, link, ENABLED) { 4610 if (!dev->sdev) 4611 goto exit_loop; 4612 } 4613 } 4614 exit_loop: 4615 if (!link) 4616 return; 4617 4618 /* we're missing some SCSI devices */ 4619 if (sync) { 4620 /* If caller requested synchrnous scan && we've made 4621 * any progress, sleep briefly and repeat. 4622 */ 4623 if (dev != last_failed_dev) { 4624 msleep(100); 4625 last_failed_dev = dev; 4626 goto repeat; 4627 } 4628 4629 /* We might be failing to detect boot device, give it 4630 * a few more chances. 4631 */ 4632 if (--tries) { 4633 msleep(100); 4634 goto repeat; 4635 } 4636 4637 ata_port_err(ap, 4638 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 4639 } 4640 4641 queue_delayed_work(system_long_wq, &ap->hotplug_task, 4642 round_jiffies_relative(HZ)); 4643 } 4644 4645 /** 4646 * ata_scsi_offline_dev - offline attached SCSI device 4647 * @dev: ATA device to offline attached SCSI device for 4648 * 4649 * This function is called from ata_eh_hotplug() and responsible 4650 * for taking the SCSI device attached to @dev offline. This 4651 * function is called with host lock which protects dev->sdev 4652 * against clearing. 4653 * 4654 * LOCKING: 4655 * spin_lock_irqsave(host lock) 4656 * 4657 * RETURNS: 4658 * 1 if attached SCSI device exists, 0 otherwise. 4659 */ 4660 int ata_scsi_offline_dev(struct ata_device *dev) 4661 { 4662 if (dev->sdev) { 4663 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 4664 return 1; 4665 } 4666 return 0; 4667 } 4668 4669 /** 4670 * ata_scsi_remove_dev - remove attached SCSI device 4671 * @dev: ATA device to remove attached SCSI device for 4672 * 4673 * This function is called from ata_eh_scsi_hotplug() and 4674 * responsible for removing the SCSI device attached to @dev. 4675 * 4676 * LOCKING: 4677 * Kernel thread context (may sleep). 4678 */ 4679 static void ata_scsi_remove_dev(struct ata_device *dev) 4680 { 4681 struct ata_port *ap = dev->link->ap; 4682 struct scsi_device *sdev; 4683 unsigned long flags; 4684 4685 /* Alas, we need to grab scan_mutex to ensure SCSI device 4686 * state doesn't change underneath us and thus 4687 * scsi_device_get() always succeeds. The mutex locking can 4688 * be removed if there is __scsi_device_get() interface which 4689 * increments reference counts regardless of device state. 4690 */ 4691 mutex_lock(&ap->scsi_host->scan_mutex); 4692 spin_lock_irqsave(ap->lock, flags); 4693 4694 /* clearing dev->sdev is protected by host lock */ 4695 sdev = dev->sdev; 4696 dev->sdev = NULL; 4697 4698 if (sdev) { 4699 /* If user initiated unplug races with us, sdev can go 4700 * away underneath us after the host lock and 4701 * scan_mutex are released. Hold onto it. 4702 */ 4703 if (scsi_device_get(sdev) == 0) { 4704 /* The following ensures the attached sdev is 4705 * offline on return from ata_scsi_offline_dev() 4706 * regardless it wins or loses the race 4707 * against this function. 4708 */ 4709 scsi_device_set_state(sdev, SDEV_OFFLINE); 4710 } else { 4711 WARN_ON(1); 4712 sdev = NULL; 4713 } 4714 } 4715 4716 spin_unlock_irqrestore(ap->lock, flags); 4717 mutex_unlock(&ap->scsi_host->scan_mutex); 4718 4719 if (sdev) { 4720 ata_dev_info(dev, "detaching (SCSI %s)\n", 4721 dev_name(&sdev->sdev_gendev)); 4722 4723 scsi_remove_device(sdev); 4724 scsi_device_put(sdev); 4725 } 4726 } 4727 4728 static void ata_scsi_handle_link_detach(struct ata_link *link) 4729 { 4730 struct ata_port *ap = link->ap; 4731 struct ata_device *dev; 4732 4733 ata_for_each_dev(dev, link, ALL) { 4734 unsigned long flags; 4735 4736 if (!(dev->flags & ATA_DFLAG_DETACHED)) 4737 continue; 4738 4739 spin_lock_irqsave(ap->lock, flags); 4740 dev->flags &= ~ATA_DFLAG_DETACHED; 4741 spin_unlock_irqrestore(ap->lock, flags); 4742 4743 if (zpodd_dev_enabled(dev)) 4744 zpodd_exit(dev); 4745 4746 ata_scsi_remove_dev(dev); 4747 } 4748 } 4749 4750 /** 4751 * ata_scsi_media_change_notify - send media change event 4752 * @dev: Pointer to the disk device with media change event 4753 * 4754 * Tell the block layer to send a media change notification 4755 * event. 4756 * 4757 * LOCKING: 4758 * spin_lock_irqsave(host lock) 4759 */ 4760 void ata_scsi_media_change_notify(struct ata_device *dev) 4761 { 4762 if (dev->sdev) 4763 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 4764 GFP_ATOMIC); 4765 } 4766 4767 /** 4768 * ata_scsi_hotplug - SCSI part of hotplug 4769 * @work: Pointer to ATA port to perform SCSI hotplug on 4770 * 4771 * Perform SCSI part of hotplug. It's executed from a separate 4772 * workqueue after EH completes. This is necessary because SCSI 4773 * hot plugging requires working EH and hot unplugging is 4774 * synchronized with hot plugging with a mutex. 4775 * 4776 * LOCKING: 4777 * Kernel thread context (may sleep). 4778 */ 4779 void ata_scsi_hotplug(struct work_struct *work) 4780 { 4781 struct ata_port *ap = 4782 container_of(work, struct ata_port, hotplug_task.work); 4783 int i; 4784 4785 if (ap->pflags & ATA_PFLAG_UNLOADING) { 4786 DPRINTK("ENTER/EXIT - unloading\n"); 4787 return; 4788 } 4789 4790 /* 4791 * XXX - UGLY HACK 4792 * 4793 * The block layer suspend/resume path is fundamentally broken due 4794 * to freezable kthreads and workqueue and may deadlock if a block 4795 * device gets removed while resume is in progress. I don't know 4796 * what the solution is short of removing freezable kthreads and 4797 * workqueues altogether. 4798 * 4799 * The following is an ugly hack to avoid kicking off device 4800 * removal while freezer is active. This is a joke but does avoid 4801 * this particular deadlock scenario. 4802 * 4803 * https://bugzilla.kernel.org/show_bug.cgi?id=62801 4804 * http://marc.info/?l=linux-kernel&m=138695698516487 4805 */ 4806 #ifdef CONFIG_FREEZER 4807 while (pm_freezing) 4808 msleep(10); 4809 #endif 4810 4811 DPRINTK("ENTER\n"); 4812 mutex_lock(&ap->scsi_scan_mutex); 4813 4814 /* Unplug detached devices. We cannot use link iterator here 4815 * because PMP links have to be scanned even if PMP is 4816 * currently not attached. Iterate manually. 4817 */ 4818 ata_scsi_handle_link_detach(&ap->link); 4819 if (ap->pmp_link) 4820 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 4821 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 4822 4823 /* scan for new ones */ 4824 ata_scsi_scan_host(ap, 0); 4825 4826 mutex_unlock(&ap->scsi_scan_mutex); 4827 DPRINTK("EXIT\n"); 4828 } 4829 4830 /** 4831 * ata_scsi_user_scan - indication for user-initiated bus scan 4832 * @shost: SCSI host to scan 4833 * @channel: Channel to scan 4834 * @id: ID to scan 4835 * @lun: LUN to scan 4836 * 4837 * This function is called when user explicitly requests bus 4838 * scan. Set probe pending flag and invoke EH. 4839 * 4840 * LOCKING: 4841 * SCSI layer (we don't care) 4842 * 4843 * RETURNS: 4844 * Zero. 4845 */ 4846 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 4847 unsigned int id, u64 lun) 4848 { 4849 struct ata_port *ap = ata_shost_to_port(shost); 4850 unsigned long flags; 4851 int devno, rc = 0; 4852 4853 if (!ap->ops->error_handler) 4854 return -EOPNOTSUPP; 4855 4856 if (lun != SCAN_WILD_CARD && lun) 4857 return -EINVAL; 4858 4859 if (!sata_pmp_attached(ap)) { 4860 if (channel != SCAN_WILD_CARD && channel) 4861 return -EINVAL; 4862 devno = id; 4863 } else { 4864 if (id != SCAN_WILD_CARD && id) 4865 return -EINVAL; 4866 devno = channel; 4867 } 4868 4869 spin_lock_irqsave(ap->lock, flags); 4870 4871 if (devno == SCAN_WILD_CARD) { 4872 struct ata_link *link; 4873 4874 ata_for_each_link(link, ap, EDGE) { 4875 struct ata_eh_info *ehi = &link->eh_info; 4876 ehi->probe_mask |= ATA_ALL_DEVICES; 4877 ehi->action |= ATA_EH_RESET; 4878 } 4879 } else { 4880 struct ata_device *dev = ata_find_dev(ap, devno); 4881 4882 if (dev) { 4883 struct ata_eh_info *ehi = &dev->link->eh_info; 4884 ehi->probe_mask |= 1 << dev->devno; 4885 ehi->action |= ATA_EH_RESET; 4886 } else 4887 rc = -EINVAL; 4888 } 4889 4890 if (rc == 0) { 4891 ata_port_schedule_eh(ap); 4892 spin_unlock_irqrestore(ap->lock, flags); 4893 ata_port_wait_eh(ap); 4894 } else 4895 spin_unlock_irqrestore(ap->lock, flags); 4896 4897 return rc; 4898 } 4899 4900 /** 4901 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4902 * @work: Pointer to ATA port to perform scsi_rescan_device() 4903 * 4904 * After ATA pass thru (SAT) commands are executed successfully, 4905 * libata need to propagate the changes to SCSI layer. 4906 * 4907 * LOCKING: 4908 * Kernel thread context (may sleep). 4909 */ 4910 void ata_scsi_dev_rescan(struct work_struct *work) 4911 { 4912 struct ata_port *ap = 4913 container_of(work, struct ata_port, scsi_rescan_task); 4914 struct ata_link *link; 4915 struct ata_device *dev; 4916 unsigned long flags; 4917 4918 mutex_lock(&ap->scsi_scan_mutex); 4919 spin_lock_irqsave(ap->lock, flags); 4920 4921 ata_for_each_link(link, ap, EDGE) { 4922 ata_for_each_dev(dev, link, ENABLED) { 4923 struct scsi_device *sdev = dev->sdev; 4924 4925 if (!sdev) 4926 continue; 4927 if (scsi_device_get(sdev)) 4928 continue; 4929 4930 spin_unlock_irqrestore(ap->lock, flags); 4931 scsi_rescan_device(&(sdev->sdev_gendev)); 4932 scsi_device_put(sdev); 4933 spin_lock_irqsave(ap->lock, flags); 4934 } 4935 } 4936 4937 spin_unlock_irqrestore(ap->lock, flags); 4938 mutex_unlock(&ap->scsi_scan_mutex); 4939 } 4940 4941 /** 4942 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4943 * @host: ATA host container for all SAS ports 4944 * @port_info: Information from low-level host driver 4945 * @shost: SCSI host that the scsi device is attached to 4946 * 4947 * LOCKING: 4948 * PCI/etc. bus probe sem. 4949 * 4950 * RETURNS: 4951 * ata_port pointer on success / NULL on failure. 4952 */ 4953 4954 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4955 struct ata_port_info *port_info, 4956 struct Scsi_Host *shost) 4957 { 4958 struct ata_port *ap; 4959 4960 ap = ata_port_alloc(host); 4961 if (!ap) 4962 return NULL; 4963 4964 ap->port_no = 0; 4965 ap->lock = &host->lock; 4966 ap->pio_mask = port_info->pio_mask; 4967 ap->mwdma_mask = port_info->mwdma_mask; 4968 ap->udma_mask = port_info->udma_mask; 4969 ap->flags |= port_info->flags; 4970 ap->ops = port_info->port_ops; 4971 ap->cbl = ATA_CBL_SATA; 4972 4973 return ap; 4974 } 4975 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4976 4977 /** 4978 * ata_sas_port_start - Set port up for dma. 4979 * @ap: Port to initialize 4980 * 4981 * Called just after data structures for each port are 4982 * initialized. 4983 * 4984 * May be used as the port_start() entry in ata_port_operations. 4985 * 4986 * LOCKING: 4987 * Inherited from caller. 4988 */ 4989 int ata_sas_port_start(struct ata_port *ap) 4990 { 4991 /* 4992 * the port is marked as frozen at allocation time, but if we don't 4993 * have new eh, we won't thaw it 4994 */ 4995 if (!ap->ops->error_handler) 4996 ap->pflags &= ~ATA_PFLAG_FROZEN; 4997 return 0; 4998 } 4999 EXPORT_SYMBOL_GPL(ata_sas_port_start); 5000 5001 /** 5002 * ata_port_stop - Undo ata_sas_port_start() 5003 * @ap: Port to shut down 5004 * 5005 * May be used as the port_stop() entry in ata_port_operations. 5006 * 5007 * LOCKING: 5008 * Inherited from caller. 5009 */ 5010 5011 void ata_sas_port_stop(struct ata_port *ap) 5012 { 5013 } 5014 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 5015 5016 /** 5017 * ata_sas_async_probe - simply schedule probing and return 5018 * @ap: Port to probe 5019 * 5020 * For batch scheduling of probe for sas attached ata devices, assumes 5021 * the port has already been through ata_sas_port_init() 5022 */ 5023 void ata_sas_async_probe(struct ata_port *ap) 5024 { 5025 __ata_port_probe(ap); 5026 } 5027 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 5028 5029 int ata_sas_sync_probe(struct ata_port *ap) 5030 { 5031 return ata_port_probe(ap); 5032 } 5033 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 5034 5035 5036 /** 5037 * ata_sas_port_init - Initialize a SATA device 5038 * @ap: SATA port to initialize 5039 * 5040 * LOCKING: 5041 * PCI/etc. bus probe sem. 5042 * 5043 * RETURNS: 5044 * Zero on success, non-zero on error. 5045 */ 5046 5047 int ata_sas_port_init(struct ata_port *ap) 5048 { 5049 int rc = ap->ops->port_start(ap); 5050 5051 if (rc) 5052 return rc; 5053 ap->print_id = atomic_inc_return(&ata_print_id); 5054 return 0; 5055 } 5056 EXPORT_SYMBOL_GPL(ata_sas_port_init); 5057 5058 int ata_sas_tport_add(struct device *parent, struct ata_port *ap) 5059 { 5060 return ata_tport_add(parent, ap); 5061 } 5062 EXPORT_SYMBOL_GPL(ata_sas_tport_add); 5063 5064 void ata_sas_tport_delete(struct ata_port *ap) 5065 { 5066 ata_tport_delete(ap); 5067 } 5068 EXPORT_SYMBOL_GPL(ata_sas_tport_delete); 5069 5070 /** 5071 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 5072 * @ap: SATA port to destroy 5073 * 5074 */ 5075 5076 void ata_sas_port_destroy(struct ata_port *ap) 5077 { 5078 if (ap->ops->port_stop) 5079 ap->ops->port_stop(ap); 5080 kfree(ap); 5081 } 5082 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 5083 5084 /** 5085 * ata_sas_slave_configure - Default slave_config routine for libata devices 5086 * @sdev: SCSI device to configure 5087 * @ap: ATA port to which SCSI device is attached 5088 * 5089 * RETURNS: 5090 * Zero. 5091 */ 5092 5093 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 5094 { 5095 ata_scsi_sdev_config(sdev); 5096 ata_scsi_dev_config(sdev, ap->link.device); 5097 return 0; 5098 } 5099 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 5100 5101 /** 5102 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 5103 * @cmd: SCSI command to be sent 5104 * @ap: ATA port to which the command is being sent 5105 * 5106 * RETURNS: 5107 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 5108 * 0 otherwise. 5109 */ 5110 5111 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 5112 { 5113 int rc = 0; 5114 5115 ata_scsi_dump_cdb(ap, cmd); 5116 5117 if (likely(ata_dev_enabled(ap->link.device))) 5118 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 5119 else { 5120 cmd->result = (DID_BAD_TARGET << 16); 5121 cmd->scsi_done(cmd); 5122 } 5123 return rc; 5124 } 5125 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 5126 5127 int ata_sas_allocate_tag(struct ata_port *ap) 5128 { 5129 unsigned int max_queue = ap->host->n_tags; 5130 unsigned int i, tag; 5131 5132 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { 5133 tag = tag < max_queue ? tag : 0; 5134 5135 /* the last tag is reserved for internal command. */ 5136 if (ata_tag_internal(tag)) 5137 continue; 5138 5139 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { 5140 ap->sas_last_tag = tag; 5141 return tag; 5142 } 5143 } 5144 return -1; 5145 } 5146 5147 void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) 5148 { 5149 clear_bit(tag, &ap->sas_tag_allocated); 5150 } 5151