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