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/DocBook/libata.* 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 54 #include "libata.h" 55 #include "libata-transport.h" 56 57 #define ATA_SCSI_RBUF_SIZE 4096 58 59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 61 62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 63 64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 67 const struct scsi_device *scsidev); 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 static const char *ata_lpm_policy_names[] = { 108 [ATA_LPM_UNKNOWN] = "max_performance", 109 [ATA_LPM_MAX_POWER] = "max_performance", 110 [ATA_LPM_MED_POWER] = "medium_power", 111 [ATA_LPM_MIN_POWER] = "min_power", 112 }; 113 114 static ssize_t ata_scsi_lpm_store(struct device *device, 115 struct device_attribute *attr, 116 const char *buf, size_t count) 117 { 118 struct Scsi_Host *shost = class_to_shost(device); 119 struct ata_port *ap = ata_shost_to_port(shost); 120 struct ata_link *link; 121 struct ata_device *dev; 122 enum ata_lpm_policy policy; 123 unsigned long flags; 124 125 /* UNKNOWN is internal state, iterate from MAX_POWER */ 126 for (policy = ATA_LPM_MAX_POWER; 127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 128 const char *name = ata_lpm_policy_names[policy]; 129 130 if (strncmp(name, buf, strlen(name)) == 0) 131 break; 132 } 133 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 134 return -EINVAL; 135 136 spin_lock_irqsave(ap->lock, flags); 137 138 ata_for_each_link(link, ap, EDGE) { 139 ata_for_each_dev(dev, &ap->link, ENABLED) { 140 if (dev->horkage & ATA_HORKAGE_NOLPM) { 141 count = -EOPNOTSUPP; 142 goto out_unlock; 143 } 144 } 145 } 146 147 ap->target_lpm_policy = policy; 148 ata_port_schedule_eh(ap); 149 out_unlock: 150 spin_unlock_irqrestore(ap->lock, flags); 151 return count; 152 } 153 154 static ssize_t ata_scsi_lpm_show(struct device *dev, 155 struct device_attribute *attr, char *buf) 156 { 157 struct Scsi_Host *shost = class_to_shost(dev); 158 struct ata_port *ap = ata_shost_to_port(shost); 159 160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 161 return -EINVAL; 162 163 return snprintf(buf, PAGE_SIZE, "%s\n", 164 ata_lpm_policy_names[ap->target_lpm_policy]); 165 } 166 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 167 ata_scsi_lpm_show, ata_scsi_lpm_store); 168 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 169 170 static ssize_t ata_scsi_park_show(struct device *device, 171 struct device_attribute *attr, char *buf) 172 { 173 struct scsi_device *sdev = to_scsi_device(device); 174 struct ata_port *ap; 175 struct ata_link *link; 176 struct ata_device *dev; 177 unsigned long flags, now; 178 unsigned int uninitialized_var(msecs); 179 int rc = 0; 180 181 ap = ata_shost_to_port(sdev->host); 182 183 spin_lock_irqsave(ap->lock, flags); 184 dev = ata_scsi_find_dev(ap, sdev); 185 if (!dev) { 186 rc = -ENODEV; 187 goto unlock; 188 } 189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 190 rc = -EOPNOTSUPP; 191 goto unlock; 192 } 193 194 link = dev->link; 195 now = jiffies; 196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 197 link->eh_context.unloaded_mask & (1 << dev->devno) && 198 time_after(dev->unpark_deadline, now)) 199 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 200 else 201 msecs = 0; 202 203 unlock: 204 spin_unlock_irq(ap->lock); 205 206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 207 } 208 209 static ssize_t ata_scsi_park_store(struct device *device, 210 struct device_attribute *attr, 211 const char *buf, size_t len) 212 { 213 struct scsi_device *sdev = to_scsi_device(device); 214 struct ata_port *ap; 215 struct ata_device *dev; 216 long int input; 217 unsigned long flags; 218 int rc; 219 220 rc = kstrtol(buf, 10, &input); 221 if (rc) 222 return rc; 223 if (input < -2) 224 return -EINVAL; 225 if (input > ATA_TMOUT_MAX_PARK) { 226 rc = -EOVERFLOW; 227 input = ATA_TMOUT_MAX_PARK; 228 } 229 230 ap = ata_shost_to_port(sdev->host); 231 232 spin_lock_irqsave(ap->lock, flags); 233 dev = ata_scsi_find_dev(ap, sdev); 234 if (unlikely(!dev)) { 235 rc = -ENODEV; 236 goto unlock; 237 } 238 if (dev->class != ATA_DEV_ATA && 239 dev->class != ATA_DEV_ZAC) { 240 rc = -EOPNOTSUPP; 241 goto unlock; 242 } 243 244 if (input >= 0) { 245 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 246 rc = -EOPNOTSUPP; 247 goto unlock; 248 } 249 250 dev->unpark_deadline = ata_deadline(jiffies, input); 251 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 252 ata_port_schedule_eh(ap); 253 complete(&ap->park_req_pending); 254 } else { 255 switch (input) { 256 case -1: 257 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 258 break; 259 case -2: 260 dev->flags |= ATA_DFLAG_NO_UNLOAD; 261 break; 262 } 263 } 264 unlock: 265 spin_unlock_irqrestore(ap->lock, flags); 266 267 return rc ? rc : len; 268 } 269 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 270 ata_scsi_park_show, ata_scsi_park_store); 271 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 272 273 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 274 { 275 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 276 277 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 278 } 279 280 static ssize_t 281 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 282 const char *buf, size_t count) 283 { 284 struct Scsi_Host *shost = class_to_shost(dev); 285 struct ata_port *ap = ata_shost_to_port(shost); 286 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 287 return ap->ops->em_store(ap, buf, count); 288 return -EINVAL; 289 } 290 291 static ssize_t 292 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 293 char *buf) 294 { 295 struct Scsi_Host *shost = class_to_shost(dev); 296 struct ata_port *ap = ata_shost_to_port(shost); 297 298 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 299 return ap->ops->em_show(ap, buf); 300 return -EINVAL; 301 } 302 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 303 ata_scsi_em_message_show, ata_scsi_em_message_store); 304 EXPORT_SYMBOL_GPL(dev_attr_em_message); 305 306 static ssize_t 307 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct Scsi_Host *shost = class_to_shost(dev); 311 struct ata_port *ap = ata_shost_to_port(shost); 312 313 return snprintf(buf, 23, "%d\n", ap->em_message_type); 314 } 315 DEVICE_ATTR(em_message_type, S_IRUGO, 316 ata_scsi_em_message_type_show, NULL); 317 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 318 319 static ssize_t 320 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 321 char *buf) 322 { 323 struct scsi_device *sdev = to_scsi_device(dev); 324 struct ata_port *ap = ata_shost_to_port(sdev->host); 325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 326 327 if (atadev && ap->ops->sw_activity_show && 328 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 329 return ap->ops->sw_activity_show(atadev, buf); 330 return -EINVAL; 331 } 332 333 static ssize_t 334 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 335 const char *buf, size_t count) 336 { 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 enum sw_activity val; 341 int rc; 342 343 if (atadev && ap->ops->sw_activity_store && 344 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 345 val = simple_strtoul(buf, NULL, 0); 346 switch (val) { 347 case OFF: case BLINK_ON: case BLINK_OFF: 348 rc = ap->ops->sw_activity_store(atadev, val); 349 if (!rc) 350 return count; 351 else 352 return rc; 353 } 354 } 355 return -EINVAL; 356 } 357 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 358 ata_scsi_activity_store); 359 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 360 361 struct device_attribute *ata_common_sdev_attrs[] = { 362 &dev_attr_unload_heads, 363 NULL 364 }; 365 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 366 367 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 368 { 369 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 370 /* "Invalid field in cbd" */ 371 cmd->scsi_done(cmd); 372 } 373 374 /** 375 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 376 * @sdev: SCSI device for which BIOS geometry is to be determined 377 * @bdev: block device associated with @sdev 378 * @capacity: capacity of SCSI device 379 * @geom: location to which geometry will be output 380 * 381 * Generic bios head/sector/cylinder calculator 382 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 383 * mapping. Some situations may arise where the disk is not 384 * bootable if this is not used. 385 * 386 * LOCKING: 387 * Defined by the SCSI layer. We don't really care. 388 * 389 * RETURNS: 390 * Zero. 391 */ 392 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 393 sector_t capacity, int geom[]) 394 { 395 geom[0] = 255; 396 geom[1] = 63; 397 sector_div(capacity, 255*63); 398 geom[2] = capacity; 399 400 return 0; 401 } 402 403 /** 404 * ata_scsi_unlock_native_capacity - unlock native capacity 405 * @sdev: SCSI device to adjust device capacity for 406 * 407 * This function is called if a partition on @sdev extends beyond 408 * the end of the device. It requests EH to unlock HPA. 409 * 410 * LOCKING: 411 * Defined by the SCSI layer. Might sleep. 412 */ 413 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 414 { 415 struct ata_port *ap = ata_shost_to_port(sdev->host); 416 struct ata_device *dev; 417 unsigned long flags; 418 419 spin_lock_irqsave(ap->lock, flags); 420 421 dev = ata_scsi_find_dev(ap, sdev); 422 if (dev && dev->n_sectors < dev->n_native_sectors) { 423 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 424 dev->link->eh_info.action |= ATA_EH_RESET; 425 ata_port_schedule_eh(ap); 426 } 427 428 spin_unlock_irqrestore(ap->lock, flags); 429 ata_port_wait_eh(ap); 430 } 431 432 /** 433 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 434 * @ap: target port 435 * @sdev: SCSI device to get identify data for 436 * @arg: User buffer area for identify data 437 * 438 * LOCKING: 439 * Defined by the SCSI layer. We don't really care. 440 * 441 * RETURNS: 442 * Zero on success, negative errno on error. 443 */ 444 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 445 void __user *arg) 446 { 447 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 448 u16 __user *dst = arg; 449 char buf[40]; 450 451 if (!dev) 452 return -ENOMSG; 453 454 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 455 return -EFAULT; 456 457 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 458 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 459 return -EFAULT; 460 461 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 462 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 463 return -EFAULT; 464 465 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 466 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 467 return -EFAULT; 468 469 return 0; 470 } 471 472 /** 473 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 474 * @scsidev: Device to which we are issuing command 475 * @arg: User provided data for issuing command 476 * 477 * LOCKING: 478 * Defined by the SCSI layer. We don't really care. 479 * 480 * RETURNS: 481 * Zero on success, negative errno on error. 482 */ 483 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 484 { 485 int rc = 0; 486 u8 scsi_cmd[MAX_COMMAND_SIZE]; 487 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 488 int argsize = 0; 489 enum dma_data_direction data_dir; 490 int cmd_result; 491 492 if (arg == NULL) 493 return -EINVAL; 494 495 if (copy_from_user(args, arg, sizeof(args))) 496 return -EFAULT; 497 498 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 499 if (!sensebuf) 500 return -ENOMEM; 501 502 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 503 504 if (args[3]) { 505 argsize = ATA_SECT_SIZE * args[3]; 506 argbuf = kmalloc(argsize, GFP_KERNEL); 507 if (argbuf == NULL) { 508 rc = -ENOMEM; 509 goto error; 510 } 511 512 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 513 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 514 block count in sector count field */ 515 data_dir = DMA_FROM_DEVICE; 516 } else { 517 scsi_cmd[1] = (3 << 1); /* Non-data */ 518 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 519 data_dir = DMA_NONE; 520 } 521 522 scsi_cmd[0] = ATA_16; 523 524 scsi_cmd[4] = args[2]; 525 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 526 scsi_cmd[6] = args[3]; 527 scsi_cmd[8] = args[1]; 528 scsi_cmd[10] = 0x4f; 529 scsi_cmd[12] = 0xc2; 530 } else { 531 scsi_cmd[6] = args[1]; 532 } 533 scsi_cmd[14] = args[0]; 534 535 /* Good values for timeout and retries? Values below 536 from scsi_ioctl_send_command() for default case... */ 537 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 538 sensebuf, (10*HZ), 5, 0, NULL); 539 540 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 541 u8 *desc = sensebuf + 8; 542 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 543 544 /* If we set cc then ATA pass-through will cause a 545 * check condition even if no error. Filter that. */ 546 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 547 struct scsi_sense_hdr sshdr; 548 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 549 &sshdr); 550 if (sshdr.sense_key == RECOVERED_ERROR && 551 sshdr.asc == 0 && sshdr.ascq == 0x1d) 552 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 553 } 554 555 /* Send userspace a few ATA registers (same as drivers/ide) */ 556 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 557 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 558 args[0] = desc[13]; /* status */ 559 args[1] = desc[3]; /* error */ 560 args[2] = desc[5]; /* sector count (0:7) */ 561 if (copy_to_user(arg, args, sizeof(args))) 562 rc = -EFAULT; 563 } 564 } 565 566 567 if (cmd_result) { 568 rc = -EIO; 569 goto error; 570 } 571 572 if ((argbuf) 573 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 574 rc = -EFAULT; 575 error: 576 kfree(sensebuf); 577 kfree(argbuf); 578 return rc; 579 } 580 581 /** 582 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 583 * @scsidev: Device to which we are issuing command 584 * @arg: User provided data for issuing command 585 * 586 * LOCKING: 587 * Defined by the SCSI layer. We don't really care. 588 * 589 * RETURNS: 590 * Zero on success, negative errno on error. 591 */ 592 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 593 { 594 int rc = 0; 595 u8 scsi_cmd[MAX_COMMAND_SIZE]; 596 u8 args[7], *sensebuf = NULL; 597 int cmd_result; 598 599 if (arg == NULL) 600 return -EINVAL; 601 602 if (copy_from_user(args, arg, sizeof(args))) 603 return -EFAULT; 604 605 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 606 if (!sensebuf) 607 return -ENOMEM; 608 609 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 610 scsi_cmd[0] = ATA_16; 611 scsi_cmd[1] = (3 << 1); /* Non-data */ 612 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 613 scsi_cmd[4] = args[1]; 614 scsi_cmd[6] = args[2]; 615 scsi_cmd[8] = args[3]; 616 scsi_cmd[10] = args[4]; 617 scsi_cmd[12] = args[5]; 618 scsi_cmd[13] = args[6] & 0x4f; 619 scsi_cmd[14] = args[0]; 620 621 /* Good values for timeout and retries? Values below 622 from scsi_ioctl_send_command() for default case... */ 623 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 624 sensebuf, (10*HZ), 5, 0, NULL); 625 626 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 627 u8 *desc = sensebuf + 8; 628 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 629 630 /* If we set cc then ATA pass-through will cause a 631 * check condition even if no error. Filter that. */ 632 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 633 struct scsi_sense_hdr sshdr; 634 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 635 &sshdr); 636 if (sshdr.sense_key == RECOVERED_ERROR && 637 sshdr.asc == 0 && sshdr.ascq == 0x1d) 638 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 639 } 640 641 /* Send userspace ATA registers */ 642 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 643 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 644 args[0] = desc[13]; /* status */ 645 args[1] = desc[3]; /* error */ 646 args[2] = desc[5]; /* sector count (0:7) */ 647 args[3] = desc[7]; /* lbal */ 648 args[4] = desc[9]; /* lbam */ 649 args[5] = desc[11]; /* lbah */ 650 args[6] = desc[12]; /* select */ 651 if (copy_to_user(arg, args, sizeof(args))) 652 rc = -EFAULT; 653 } 654 } 655 656 if (cmd_result) { 657 rc = -EIO; 658 goto error; 659 } 660 661 error: 662 kfree(sensebuf); 663 return rc; 664 } 665 666 static int ata_ioc32(struct ata_port *ap) 667 { 668 if (ap->flags & ATA_FLAG_PIO_DMA) 669 return 1; 670 if (ap->pflags & ATA_PFLAG_PIO32) 671 return 1; 672 return 0; 673 } 674 675 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 676 int cmd, void __user *arg) 677 { 678 int val = -EINVAL, rc = -EINVAL; 679 unsigned long flags; 680 681 switch (cmd) { 682 case ATA_IOC_GET_IO32: 683 spin_lock_irqsave(ap->lock, flags); 684 val = ata_ioc32(ap); 685 spin_unlock_irqrestore(ap->lock, flags); 686 if (copy_to_user(arg, &val, 1)) 687 return -EFAULT; 688 return 0; 689 690 case ATA_IOC_SET_IO32: 691 val = (unsigned long) arg; 692 rc = 0; 693 spin_lock_irqsave(ap->lock, flags); 694 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 695 if (val) 696 ap->pflags |= ATA_PFLAG_PIO32; 697 else 698 ap->pflags &= ~ATA_PFLAG_PIO32; 699 } else { 700 if (val != ata_ioc32(ap)) 701 rc = -EINVAL; 702 } 703 spin_unlock_irqrestore(ap->lock, flags); 704 return rc; 705 706 case HDIO_GET_IDENTITY: 707 return ata_get_identity(ap, scsidev, arg); 708 709 case HDIO_DRIVE_CMD: 710 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 711 return -EACCES; 712 return ata_cmd_ioctl(scsidev, arg); 713 714 case HDIO_DRIVE_TASK: 715 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 716 return -EACCES; 717 return ata_task_ioctl(scsidev, arg); 718 719 default: 720 rc = -ENOTTY; 721 break; 722 } 723 724 return rc; 725 } 726 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 727 728 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 729 { 730 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 731 scsidev, cmd, arg); 732 } 733 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 734 735 /** 736 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 737 * @dev: ATA device to which the new command is attached 738 * @cmd: SCSI command that originated this ATA command 739 * 740 * Obtain a reference to an unused ata_queued_cmd structure, 741 * which is the basic libata structure representing a single 742 * ATA command sent to the hardware. 743 * 744 * If a command was available, fill in the SCSI-specific 745 * portions of the structure with information on the 746 * current command. 747 * 748 * LOCKING: 749 * spin_lock_irqsave(host lock) 750 * 751 * RETURNS: 752 * Command allocated, or %NULL if none available. 753 */ 754 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 755 struct scsi_cmnd *cmd) 756 { 757 struct ata_queued_cmd *qc; 758 759 qc = ata_qc_new_init(dev, cmd->request->tag); 760 if (qc) { 761 qc->scsicmd = cmd; 762 qc->scsidone = cmd->scsi_done; 763 764 qc->sg = scsi_sglist(cmd); 765 qc->n_elem = scsi_sg_count(cmd); 766 } else { 767 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 768 cmd->scsi_done(cmd); 769 } 770 771 return qc; 772 } 773 774 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 775 { 776 struct scsi_cmnd *scmd = qc->scsicmd; 777 778 qc->extrabytes = scmd->request->extra_len; 779 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 780 } 781 782 /** 783 * ata_dump_status - user friendly display of error info 784 * @id: id of the port in question 785 * @tf: ptr to filled out taskfile 786 * 787 * Decode and dump the ATA error/status registers for the user so 788 * that they have some idea what really happened at the non 789 * make-believe layer. 790 * 791 * LOCKING: 792 * inherited from caller 793 */ 794 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 795 { 796 u8 stat = tf->command, err = tf->feature; 797 798 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 799 if (stat & ATA_BUSY) { 800 printk("Busy }\n"); /* Data is not valid in this case */ 801 } else { 802 if (stat & ATA_DRDY) printk("DriveReady "); 803 if (stat & ATA_DF) printk("DeviceFault "); 804 if (stat & ATA_DSC) printk("SeekComplete "); 805 if (stat & ATA_DRQ) printk("DataRequest "); 806 if (stat & ATA_CORR) printk("CorrectedError "); 807 if (stat & ATA_SENSE) printk("Sense "); 808 if (stat & ATA_ERR) printk("Error "); 809 printk("}\n"); 810 811 if (err) { 812 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 813 if (err & ATA_ABORTED) printk("DriveStatusError "); 814 if (err & ATA_ICRC) { 815 if (err & ATA_ABORTED) 816 printk("BadCRC "); 817 else printk("Sector "); 818 } 819 if (err & ATA_UNC) printk("UncorrectableError "); 820 if (err & ATA_IDNF) printk("SectorIdNotFound "); 821 if (err & ATA_TRK0NF) printk("TrackZeroNotFound "); 822 if (err & ATA_AMNF) printk("AddrMarkNotFound "); 823 printk("}\n"); 824 } 825 } 826 } 827 828 /** 829 * ata_to_sense_error - convert ATA error to SCSI error 830 * @id: ATA device number 831 * @drv_stat: value contained in ATA status register 832 * @drv_err: value contained in ATA error register 833 * @sk: the sense key we'll fill out 834 * @asc: the additional sense code we'll fill out 835 * @ascq: the additional sense code qualifier we'll fill out 836 * @verbose: be verbose 837 * 838 * Converts an ATA error into a SCSI error. Fill out pointers to 839 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 840 * format sense blocks. 841 * 842 * LOCKING: 843 * spin_lock_irqsave(host lock) 844 */ 845 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 846 u8 *asc, u8 *ascq, int verbose) 847 { 848 int i; 849 850 /* Based on the 3ware driver translation table */ 851 static const unsigned char sense_table[][4] = { 852 /* BBD|ECC|ID|MAR */ 853 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 854 // Device busy Aborted command 855 /* BBD|ECC|ID */ 856 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 857 // Device busy Aborted command 858 /* ECC|MC|MARK */ 859 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 860 // Device fault Hardware error 861 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 862 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 863 // Data CRC error SCSI parity error 864 /* MC|ID|ABRT|TRK0|MARK */ 865 {0x37, NOT_READY, 0x04, 0x00}, 866 // Unit offline Not ready 867 /* MCR|MARK */ 868 {0x09, NOT_READY, 0x04, 0x00}, 869 // Unrecovered disk error Not ready 870 /* Bad address mark */ 871 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 872 // Address mark not found for data field 873 /* TRK0 - Track 0 not found */ 874 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 875 // Hardware error 876 /* Abort: 0x04 is not translated here, see below */ 877 /* Media change request */ 878 {0x08, NOT_READY, 0x04, 0x00}, 879 // FIXME: faking offline 880 /* SRV/IDNF - ID not found */ 881 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 882 // Logical address out of range 883 /* MC - Media Changed */ 884 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 885 // Not ready to ready change, medium may have changed 886 /* ECC - Uncorrectable ECC error */ 887 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 888 // Unrecovered read error 889 /* BBD - block marked bad */ 890 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 891 // Block marked bad Medium error, unrecovered read error 892 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 893 }; 894 static const unsigned char stat_table[][4] = { 895 /* Must be first because BUSY means no other bits valid */ 896 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 897 // Busy, fake parity for now 898 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 899 // Device ready, unaligned write command 900 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 901 // Device fault, internal target failure 902 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 903 // Timed out in xfer, fake parity for now 904 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 905 // Recovered ECC error Medium error, recovered 906 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 907 }; 908 909 /* 910 * Is this an error we can process/parse 911 */ 912 if (drv_stat & ATA_BUSY) { 913 drv_err = 0; /* Ignore the err bits, they're invalid */ 914 } 915 916 if (drv_err) { 917 /* Look for drv_err */ 918 for (i = 0; sense_table[i][0] != 0xFF; i++) { 919 /* Look for best matches first */ 920 if ((sense_table[i][0] & drv_err) == 921 sense_table[i][0]) { 922 *sk = sense_table[i][1]; 923 *asc = sense_table[i][2]; 924 *ascq = sense_table[i][3]; 925 goto translate_done; 926 } 927 } 928 } 929 930 /* 931 * Fall back to interpreting status bits. Note that if the drv_err 932 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 933 * is not descriptive enough. 934 */ 935 for (i = 0; stat_table[i][0] != 0xFF; i++) { 936 if (stat_table[i][0] & drv_stat) { 937 *sk = stat_table[i][1]; 938 *asc = stat_table[i][2]; 939 *ascq = stat_table[i][3]; 940 goto translate_done; 941 } 942 } 943 944 /* 945 * We need a sensible error return here, which is tricky, and one 946 * that won't cause people to do things like return a disk wrongly. 947 */ 948 *sk = ABORTED_COMMAND; 949 *asc = 0x00; 950 *ascq = 0x00; 951 952 translate_done: 953 if (verbose) 954 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 955 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 956 id, drv_stat, drv_err, *sk, *asc, *ascq); 957 return; 958 } 959 960 /* 961 * ata_gen_passthru_sense - Generate check condition sense block. 962 * @qc: Command that completed. 963 * 964 * This function is specific to the ATA descriptor format sense 965 * block specified for the ATA pass through commands. Regardless 966 * of whether the command errored or not, return a sense 967 * block. Copy all controller registers into the sense 968 * block. If there was no error, we get the request from an ATA 969 * passthrough command, so we use the following sense data: 970 * sk = RECOVERED ERROR 971 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 972 * 973 * 974 * LOCKING: 975 * None. 976 */ 977 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 978 { 979 struct scsi_cmnd *cmd = qc->scsicmd; 980 struct ata_taskfile *tf = &qc->result_tf; 981 unsigned char *sb = cmd->sense_buffer; 982 unsigned char *desc = sb + 8; 983 int verbose = qc->ap->ops->error_handler == NULL; 984 985 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 986 987 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 988 989 /* 990 * Use ata_to_sense_error() to map status register bits 991 * onto sense key, asc & ascq. 992 */ 993 if (qc->err_mask || 994 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 995 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 996 &sb[1], &sb[2], &sb[3], verbose); 997 sb[1] &= 0x0f; 998 } else { 999 sb[1] = RECOVERED_ERROR; 1000 sb[2] = 0; 1001 sb[3] = 0x1D; 1002 } 1003 1004 /* 1005 * Sense data is current and format is descriptor. 1006 */ 1007 sb[0] = 0x72; 1008 1009 desc[0] = 0x09; 1010 1011 /* set length of additional sense data */ 1012 sb[7] = 14; 1013 desc[1] = 12; 1014 1015 /* 1016 * Copy registers into sense buffer. 1017 */ 1018 desc[2] = 0x00; 1019 desc[3] = tf->feature; /* == error reg */ 1020 desc[5] = tf->nsect; 1021 desc[7] = tf->lbal; 1022 desc[9] = tf->lbam; 1023 desc[11] = tf->lbah; 1024 desc[12] = tf->device; 1025 desc[13] = tf->command; /* == status reg */ 1026 1027 /* 1028 * Fill in Extend bit, and the high order bytes 1029 * if applicable. 1030 */ 1031 if (tf->flags & ATA_TFLAG_LBA48) { 1032 desc[2] |= 0x01; 1033 desc[4] = tf->hob_nsect; 1034 desc[6] = tf->hob_lbal; 1035 desc[8] = tf->hob_lbam; 1036 desc[10] = tf->hob_lbah; 1037 } 1038 } 1039 1040 /** 1041 * ata_gen_ata_sense - generate a SCSI fixed sense block 1042 * @qc: Command that we are erroring out 1043 * 1044 * Generate sense block for a failed ATA command @qc. Descriptor 1045 * format is used to accommodate LBA48 block address. 1046 * 1047 * LOCKING: 1048 * None. 1049 */ 1050 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1051 { 1052 struct ata_device *dev = qc->dev; 1053 struct scsi_cmnd *cmd = qc->scsicmd; 1054 struct ata_taskfile *tf = &qc->result_tf; 1055 unsigned char *sb = cmd->sense_buffer; 1056 unsigned char *desc = sb + 8; 1057 int verbose = qc->ap->ops->error_handler == NULL; 1058 u64 block; 1059 1060 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1061 1062 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1063 1064 /* sense data is current and format is descriptor */ 1065 sb[0] = 0x72; 1066 1067 /* Use ata_to_sense_error() to map status register bits 1068 * onto sense key, asc & ascq. 1069 */ 1070 if (qc->err_mask || 1071 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1072 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1073 &sb[1], &sb[2], &sb[3], verbose); 1074 sb[1] &= 0x0f; 1075 } 1076 1077 block = ata_tf_read_block(&qc->result_tf, dev); 1078 1079 /* information sense data descriptor */ 1080 sb[7] = 12; 1081 desc[0] = 0x00; 1082 desc[1] = 10; 1083 1084 desc[2] |= 0x80; /* valid */ 1085 desc[6] = block >> 40; 1086 desc[7] = block >> 32; 1087 desc[8] = block >> 24; 1088 desc[9] = block >> 16; 1089 desc[10] = block >> 8; 1090 desc[11] = block; 1091 } 1092 1093 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1094 { 1095 sdev->use_10_for_rw = 1; 1096 sdev->use_10_for_ms = 1; 1097 sdev->no_report_opcodes = 1; 1098 sdev->no_write_same = 1; 1099 1100 /* Schedule policy is determined by ->qc_defer() callback and 1101 * it needs to see every deferred qc. Set dev_blocked to 1 to 1102 * prevent SCSI midlayer from automatically deferring 1103 * requests. 1104 */ 1105 sdev->max_device_blocked = 1; 1106 } 1107 1108 /** 1109 * atapi_drain_needed - Check whether data transfer may overflow 1110 * @rq: request to be checked 1111 * 1112 * ATAPI commands which transfer variable length data to host 1113 * might overflow due to application error or hardare bug. This 1114 * function checks whether overflow should be drained and ignored 1115 * for @request. 1116 * 1117 * LOCKING: 1118 * None. 1119 * 1120 * RETURNS: 1121 * 1 if ; otherwise, 0. 1122 */ 1123 static int atapi_drain_needed(struct request *rq) 1124 { 1125 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1126 return 0; 1127 1128 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1129 return 0; 1130 1131 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1132 } 1133 1134 static int ata_scsi_dev_config(struct scsi_device *sdev, 1135 struct ata_device *dev) 1136 { 1137 struct request_queue *q = sdev->request_queue; 1138 1139 if (!ata_id_has_unload(dev->id)) 1140 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1141 1142 /* configure max sectors */ 1143 blk_queue_max_hw_sectors(q, dev->max_sectors); 1144 1145 if (dev->class == ATA_DEV_ATAPI) { 1146 void *buf; 1147 1148 sdev->sector_size = ATA_SECT_SIZE; 1149 1150 /* set DMA padding */ 1151 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1152 1153 /* configure draining */ 1154 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1155 if (!buf) { 1156 ata_dev_err(dev, "drain buffer allocation failed\n"); 1157 return -ENOMEM; 1158 } 1159 1160 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1161 } else { 1162 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1163 sdev->manage_start_stop = 1; 1164 } 1165 1166 /* 1167 * ata_pio_sectors() expects buffer for each sector to not cross 1168 * page boundary. Enforce it by requiring buffers to be sector 1169 * aligned, which works iff sector_size is not larger than 1170 * PAGE_SIZE. ATAPI devices also need the alignment as 1171 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1172 */ 1173 if (sdev->sector_size > PAGE_SIZE) 1174 ata_dev_warn(dev, 1175 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1176 sdev->sector_size); 1177 1178 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1179 1180 if (dev->flags & ATA_DFLAG_AN) 1181 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1182 1183 if (dev->flags & ATA_DFLAG_NCQ) { 1184 int depth; 1185 1186 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1187 depth = min(ATA_MAX_QUEUE - 1, depth); 1188 scsi_change_queue_depth(sdev, depth); 1189 } 1190 1191 blk_queue_flush_queueable(q, false); 1192 1193 dev->sdev = sdev; 1194 return 0; 1195 } 1196 1197 /** 1198 * ata_scsi_slave_config - Set SCSI device attributes 1199 * @sdev: SCSI device to examine 1200 * 1201 * This is called before we actually start reading 1202 * and writing to the device, to configure certain 1203 * SCSI mid-layer behaviors. 1204 * 1205 * LOCKING: 1206 * Defined by SCSI layer. We don't really care. 1207 */ 1208 1209 int ata_scsi_slave_config(struct scsi_device *sdev) 1210 { 1211 struct ata_port *ap = ata_shost_to_port(sdev->host); 1212 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1213 int rc = 0; 1214 1215 ata_scsi_sdev_config(sdev); 1216 1217 if (dev) 1218 rc = ata_scsi_dev_config(sdev, dev); 1219 1220 return rc; 1221 } 1222 1223 /** 1224 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1225 * @sdev: SCSI device to be destroyed 1226 * 1227 * @sdev is about to be destroyed for hot/warm unplugging. If 1228 * this unplugging was initiated by libata as indicated by NULL 1229 * dev->sdev, this function doesn't have to do anything. 1230 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1231 * Clear dev->sdev, schedule the device for ATA detach and invoke 1232 * EH. 1233 * 1234 * LOCKING: 1235 * Defined by SCSI layer. We don't really care. 1236 */ 1237 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1238 { 1239 struct ata_port *ap = ata_shost_to_port(sdev->host); 1240 struct request_queue *q = sdev->request_queue; 1241 unsigned long flags; 1242 struct ata_device *dev; 1243 1244 if (!ap->ops->error_handler) 1245 return; 1246 1247 spin_lock_irqsave(ap->lock, flags); 1248 dev = __ata_scsi_find_dev(ap, sdev); 1249 if (dev && dev->sdev) { 1250 /* SCSI device already in CANCEL state, no need to offline it */ 1251 dev->sdev = NULL; 1252 dev->flags |= ATA_DFLAG_DETACH; 1253 ata_port_schedule_eh(ap); 1254 } 1255 spin_unlock_irqrestore(ap->lock, flags); 1256 1257 kfree(q->dma_drain_buffer); 1258 q->dma_drain_buffer = NULL; 1259 q->dma_drain_size = 0; 1260 } 1261 1262 /** 1263 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1264 * @ap: ATA port to which the device change the queue depth 1265 * @sdev: SCSI device to configure queue depth for 1266 * @queue_depth: new queue depth 1267 * 1268 * libsas and libata have different approaches for associating a sdev to 1269 * its ata_port. 1270 * 1271 */ 1272 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1273 int queue_depth) 1274 { 1275 struct ata_device *dev; 1276 unsigned long flags; 1277 1278 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1279 return sdev->queue_depth; 1280 1281 dev = ata_scsi_find_dev(ap, sdev); 1282 if (!dev || !ata_dev_enabled(dev)) 1283 return sdev->queue_depth; 1284 1285 /* NCQ enabled? */ 1286 spin_lock_irqsave(ap->lock, flags); 1287 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1288 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1289 dev->flags |= ATA_DFLAG_NCQ_OFF; 1290 queue_depth = 1; 1291 } 1292 spin_unlock_irqrestore(ap->lock, flags); 1293 1294 /* limit and apply queue depth */ 1295 queue_depth = min(queue_depth, sdev->host->can_queue); 1296 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1297 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1298 1299 if (sdev->queue_depth == queue_depth) 1300 return -EINVAL; 1301 1302 return scsi_change_queue_depth(sdev, queue_depth); 1303 } 1304 1305 /** 1306 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1307 * @sdev: SCSI device to configure queue depth for 1308 * @queue_depth: new queue depth 1309 * 1310 * This is libata standard hostt->change_queue_depth callback. 1311 * SCSI will call into this callback when user tries to set queue 1312 * depth via sysfs. 1313 * 1314 * LOCKING: 1315 * SCSI layer (we don't care) 1316 * 1317 * RETURNS: 1318 * Newly configured queue depth. 1319 */ 1320 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1321 { 1322 struct ata_port *ap = ata_shost_to_port(sdev->host); 1323 1324 return __ata_change_queue_depth(ap, sdev, queue_depth); 1325 } 1326 1327 /** 1328 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1329 * @qc: Storage for translated ATA taskfile 1330 * 1331 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1332 * (to start). Perhaps these commands should be preceded by 1333 * CHECK POWER MODE to see what power mode the device is already in. 1334 * [See SAT revision 5 at www.t10.org] 1335 * 1336 * LOCKING: 1337 * spin_lock_irqsave(host lock) 1338 * 1339 * RETURNS: 1340 * Zero on success, non-zero on error. 1341 */ 1342 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1343 { 1344 struct scsi_cmnd *scmd = qc->scsicmd; 1345 struct ata_taskfile *tf = &qc->tf; 1346 const u8 *cdb = scmd->cmnd; 1347 1348 if (scmd->cmd_len < 5) 1349 goto invalid_fld; 1350 1351 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1352 tf->protocol = ATA_PROT_NODATA; 1353 if (cdb[1] & 0x1) { 1354 ; /* ignore IMMED bit, violates sat-r05 */ 1355 } 1356 if (cdb[4] & 0x2) 1357 goto invalid_fld; /* LOEJ bit set not supported */ 1358 if (((cdb[4] >> 4) & 0xf) != 0) 1359 goto invalid_fld; /* power conditions not supported */ 1360 1361 if (cdb[4] & 0x1) { 1362 tf->nsect = 1; /* 1 sector, lba=0 */ 1363 1364 if (qc->dev->flags & ATA_DFLAG_LBA) { 1365 tf->flags |= ATA_TFLAG_LBA; 1366 1367 tf->lbah = 0x0; 1368 tf->lbam = 0x0; 1369 tf->lbal = 0x0; 1370 tf->device |= ATA_LBA; 1371 } else { 1372 /* CHS */ 1373 tf->lbal = 0x1; /* sect */ 1374 tf->lbam = 0x0; /* cyl low */ 1375 tf->lbah = 0x0; /* cyl high */ 1376 } 1377 1378 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1379 } else { 1380 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1381 * or S5) causing some drives to spin up and down again. 1382 */ 1383 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1384 system_state == SYSTEM_POWER_OFF) 1385 goto skip; 1386 1387 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1388 system_entering_hibernation()) 1389 goto skip; 1390 1391 /* Issue ATA STANDBY IMMEDIATE command */ 1392 tf->command = ATA_CMD_STANDBYNOW1; 1393 } 1394 1395 /* 1396 * Standby and Idle condition timers could be implemented but that 1397 * would require libata to implement the Power condition mode page 1398 * and allow the user to change it. Changing mode pages requires 1399 * MODE SELECT to be implemented. 1400 */ 1401 1402 return 0; 1403 1404 invalid_fld: 1405 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1406 /* "Invalid field in cbd" */ 1407 return 1; 1408 skip: 1409 scmd->result = SAM_STAT_GOOD; 1410 return 1; 1411 } 1412 1413 1414 /** 1415 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1416 * @qc: Storage for translated ATA taskfile 1417 * 1418 * Sets up an ATA taskfile to issue FLUSH CACHE or 1419 * FLUSH CACHE EXT. 1420 * 1421 * LOCKING: 1422 * spin_lock_irqsave(host lock) 1423 * 1424 * RETURNS: 1425 * Zero on success, non-zero on error. 1426 */ 1427 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1428 { 1429 struct ata_taskfile *tf = &qc->tf; 1430 1431 tf->flags |= ATA_TFLAG_DEVICE; 1432 tf->protocol = ATA_PROT_NODATA; 1433 1434 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1435 tf->command = ATA_CMD_FLUSH_EXT; 1436 else 1437 tf->command = ATA_CMD_FLUSH; 1438 1439 /* flush is critical for IO integrity, consider it an IO command */ 1440 qc->flags |= ATA_QCFLAG_IO; 1441 1442 return 0; 1443 } 1444 1445 /** 1446 * scsi_6_lba_len - Get LBA and transfer length 1447 * @cdb: SCSI command to translate 1448 * 1449 * Calculate LBA and transfer length for 6-byte commands. 1450 * 1451 * RETURNS: 1452 * @plba: the LBA 1453 * @plen: the transfer length 1454 */ 1455 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1456 { 1457 u64 lba = 0; 1458 u32 len; 1459 1460 VPRINTK("six-byte command\n"); 1461 1462 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1463 lba |= ((u64)cdb[2]) << 8; 1464 lba |= ((u64)cdb[3]); 1465 1466 len = cdb[4]; 1467 1468 *plba = lba; 1469 *plen = len; 1470 } 1471 1472 /** 1473 * scsi_10_lba_len - Get LBA and transfer length 1474 * @cdb: SCSI command to translate 1475 * 1476 * Calculate LBA and transfer length for 10-byte commands. 1477 * 1478 * RETURNS: 1479 * @plba: the LBA 1480 * @plen: the transfer length 1481 */ 1482 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1483 { 1484 u64 lba = 0; 1485 u32 len = 0; 1486 1487 VPRINTK("ten-byte command\n"); 1488 1489 lba |= ((u64)cdb[2]) << 24; 1490 lba |= ((u64)cdb[3]) << 16; 1491 lba |= ((u64)cdb[4]) << 8; 1492 lba |= ((u64)cdb[5]); 1493 1494 len |= ((u32)cdb[7]) << 8; 1495 len |= ((u32)cdb[8]); 1496 1497 *plba = lba; 1498 *plen = len; 1499 } 1500 1501 /** 1502 * scsi_16_lba_len - Get LBA and transfer length 1503 * @cdb: SCSI command to translate 1504 * 1505 * Calculate LBA and transfer length for 16-byte commands. 1506 * 1507 * RETURNS: 1508 * @plba: the LBA 1509 * @plen: the transfer length 1510 */ 1511 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1512 { 1513 u64 lba = 0; 1514 u32 len = 0; 1515 1516 VPRINTK("sixteen-byte command\n"); 1517 1518 lba |= ((u64)cdb[2]) << 56; 1519 lba |= ((u64)cdb[3]) << 48; 1520 lba |= ((u64)cdb[4]) << 40; 1521 lba |= ((u64)cdb[5]) << 32; 1522 lba |= ((u64)cdb[6]) << 24; 1523 lba |= ((u64)cdb[7]) << 16; 1524 lba |= ((u64)cdb[8]) << 8; 1525 lba |= ((u64)cdb[9]); 1526 1527 len |= ((u32)cdb[10]) << 24; 1528 len |= ((u32)cdb[11]) << 16; 1529 len |= ((u32)cdb[12]) << 8; 1530 len |= ((u32)cdb[13]); 1531 1532 *plba = lba; 1533 *plen = len; 1534 } 1535 1536 /** 1537 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1538 * @qc: Storage for translated ATA taskfile 1539 * 1540 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1541 * 1542 * LOCKING: 1543 * spin_lock_irqsave(host lock) 1544 * 1545 * RETURNS: 1546 * Zero on success, non-zero on error. 1547 */ 1548 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1549 { 1550 struct scsi_cmnd *scmd = qc->scsicmd; 1551 struct ata_taskfile *tf = &qc->tf; 1552 struct ata_device *dev = qc->dev; 1553 u64 dev_sectors = qc->dev->n_sectors; 1554 const u8 *cdb = scmd->cmnd; 1555 u64 block; 1556 u32 n_block; 1557 1558 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1559 tf->protocol = ATA_PROT_NODATA; 1560 1561 if (cdb[0] == VERIFY) { 1562 if (scmd->cmd_len < 10) 1563 goto invalid_fld; 1564 scsi_10_lba_len(cdb, &block, &n_block); 1565 } else if (cdb[0] == VERIFY_16) { 1566 if (scmd->cmd_len < 16) 1567 goto invalid_fld; 1568 scsi_16_lba_len(cdb, &block, &n_block); 1569 } else 1570 goto invalid_fld; 1571 1572 if (!n_block) 1573 goto nothing_to_do; 1574 if (block >= dev_sectors) 1575 goto out_of_range; 1576 if ((block + n_block) > dev_sectors) 1577 goto out_of_range; 1578 1579 if (dev->flags & ATA_DFLAG_LBA) { 1580 tf->flags |= ATA_TFLAG_LBA; 1581 1582 if (lba_28_ok(block, n_block)) { 1583 /* use LBA28 */ 1584 tf->command = ATA_CMD_VERIFY; 1585 tf->device |= (block >> 24) & 0xf; 1586 } else if (lba_48_ok(block, n_block)) { 1587 if (!(dev->flags & ATA_DFLAG_LBA48)) 1588 goto out_of_range; 1589 1590 /* use LBA48 */ 1591 tf->flags |= ATA_TFLAG_LBA48; 1592 tf->command = ATA_CMD_VERIFY_EXT; 1593 1594 tf->hob_nsect = (n_block >> 8) & 0xff; 1595 1596 tf->hob_lbah = (block >> 40) & 0xff; 1597 tf->hob_lbam = (block >> 32) & 0xff; 1598 tf->hob_lbal = (block >> 24) & 0xff; 1599 } else 1600 /* request too large even for LBA48 */ 1601 goto out_of_range; 1602 1603 tf->nsect = n_block & 0xff; 1604 1605 tf->lbah = (block >> 16) & 0xff; 1606 tf->lbam = (block >> 8) & 0xff; 1607 tf->lbal = block & 0xff; 1608 1609 tf->device |= ATA_LBA; 1610 } else { 1611 /* CHS */ 1612 u32 sect, head, cyl, track; 1613 1614 if (!lba_28_ok(block, n_block)) 1615 goto out_of_range; 1616 1617 /* Convert LBA to CHS */ 1618 track = (u32)block / dev->sectors; 1619 cyl = track / dev->heads; 1620 head = track % dev->heads; 1621 sect = (u32)block % dev->sectors + 1; 1622 1623 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1624 (u32)block, track, cyl, head, sect); 1625 1626 /* Check whether the converted CHS can fit. 1627 Cylinder: 0-65535 1628 Head: 0-15 1629 Sector: 1-255*/ 1630 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1631 goto out_of_range; 1632 1633 tf->command = ATA_CMD_VERIFY; 1634 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1635 tf->lbal = sect; 1636 tf->lbam = cyl; 1637 tf->lbah = cyl >> 8; 1638 tf->device |= head; 1639 } 1640 1641 return 0; 1642 1643 invalid_fld: 1644 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1645 /* "Invalid field in cbd" */ 1646 return 1; 1647 1648 out_of_range: 1649 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1650 /* "Logical Block Address out of range" */ 1651 return 1; 1652 1653 nothing_to_do: 1654 scmd->result = SAM_STAT_GOOD; 1655 return 1; 1656 } 1657 1658 /** 1659 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1660 * @qc: Storage for translated ATA taskfile 1661 * 1662 * Converts any of six SCSI read/write commands into the 1663 * ATA counterpart, including starting sector (LBA), 1664 * sector count, and taking into account the device's LBA48 1665 * support. 1666 * 1667 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1668 * %WRITE_16 are currently supported. 1669 * 1670 * LOCKING: 1671 * spin_lock_irqsave(host lock) 1672 * 1673 * RETURNS: 1674 * Zero on success, non-zero on error. 1675 */ 1676 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1677 { 1678 struct scsi_cmnd *scmd = qc->scsicmd; 1679 const u8 *cdb = scmd->cmnd; 1680 unsigned int tf_flags = 0; 1681 u64 block; 1682 u32 n_block; 1683 int rc; 1684 1685 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1686 tf_flags |= ATA_TFLAG_WRITE; 1687 1688 /* Calculate the SCSI LBA, transfer length and FUA. */ 1689 switch (cdb[0]) { 1690 case READ_10: 1691 case WRITE_10: 1692 if (unlikely(scmd->cmd_len < 10)) 1693 goto invalid_fld; 1694 scsi_10_lba_len(cdb, &block, &n_block); 1695 if (cdb[1] & (1 << 3)) 1696 tf_flags |= ATA_TFLAG_FUA; 1697 break; 1698 case READ_6: 1699 case WRITE_6: 1700 if (unlikely(scmd->cmd_len < 6)) 1701 goto invalid_fld; 1702 scsi_6_lba_len(cdb, &block, &n_block); 1703 1704 /* for 6-byte r/w commands, transfer length 0 1705 * means 256 blocks of data, not 0 block. 1706 */ 1707 if (!n_block) 1708 n_block = 256; 1709 break; 1710 case READ_16: 1711 case WRITE_16: 1712 if (unlikely(scmd->cmd_len < 16)) 1713 goto invalid_fld; 1714 scsi_16_lba_len(cdb, &block, &n_block); 1715 if (cdb[1] & (1 << 3)) 1716 tf_flags |= ATA_TFLAG_FUA; 1717 break; 1718 default: 1719 DPRINTK("no-byte command\n"); 1720 goto invalid_fld; 1721 } 1722 1723 /* Check and compose ATA command */ 1724 if (!n_block) 1725 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1726 * length 0 means transfer 0 block of data. 1727 * However, for ATA R/W commands, sector count 0 means 1728 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1729 * 1730 * WARNING: one or two older ATA drives treat 0 as 0... 1731 */ 1732 goto nothing_to_do; 1733 1734 qc->flags |= ATA_QCFLAG_IO; 1735 qc->nbytes = n_block * scmd->device->sector_size; 1736 1737 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1738 qc->tag); 1739 if (likely(rc == 0)) 1740 return 0; 1741 1742 if (rc == -ERANGE) 1743 goto out_of_range; 1744 /* treat all other errors as -EINVAL, fall through */ 1745 invalid_fld: 1746 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1747 /* "Invalid field in cbd" */ 1748 return 1; 1749 1750 out_of_range: 1751 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1752 /* "Logical Block Address out of range" */ 1753 return 1; 1754 1755 nothing_to_do: 1756 scmd->result = SAM_STAT_GOOD; 1757 return 1; 1758 } 1759 1760 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1761 { 1762 struct ata_port *ap = qc->ap; 1763 struct scsi_cmnd *cmd = qc->scsicmd; 1764 u8 *cdb = cmd->cmnd; 1765 int need_sense = (qc->err_mask != 0); 1766 1767 /* For ATA pass thru (SAT) commands, generate a sense block if 1768 * user mandated it or if there's an error. Note that if we 1769 * generate because the user forced us to [CK_COND =1], a check 1770 * condition is generated and the ATA register values are returned 1771 * whether the command completed successfully or not. If there 1772 * was no error, we use the following sense data: 1773 * sk = RECOVERED ERROR 1774 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1775 */ 1776 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1777 ((cdb[2] & 0x20) || need_sense)) { 1778 ata_gen_passthru_sense(qc); 1779 } else { 1780 if (!need_sense) { 1781 cmd->result = SAM_STAT_GOOD; 1782 } else { 1783 /* TODO: decide which descriptor format to use 1784 * for 48b LBA devices and call that here 1785 * instead of the fixed desc, which is only 1786 * good for smaller LBA (and maybe CHS?) 1787 * devices. 1788 */ 1789 ata_gen_ata_sense(qc); 1790 } 1791 } 1792 1793 if (need_sense && !ap->ops->error_handler) 1794 ata_dump_status(ap->print_id, &qc->result_tf); 1795 1796 qc->scsidone(cmd); 1797 1798 ata_qc_free(qc); 1799 } 1800 1801 /** 1802 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1803 * @dev: ATA device to which the command is addressed 1804 * @cmd: SCSI command to execute 1805 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1806 * 1807 * Our ->queuecommand() function has decided that the SCSI 1808 * command issued can be directly translated into an ATA 1809 * command, rather than handled internally. 1810 * 1811 * This function sets up an ata_queued_cmd structure for the 1812 * SCSI command, and sends that ata_queued_cmd to the hardware. 1813 * 1814 * The xlat_func argument (actor) returns 0 if ready to execute 1815 * ATA command, else 1 to finish translation. If 1 is returned 1816 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1817 * to be set reflecting an error condition or clean (early) 1818 * termination. 1819 * 1820 * LOCKING: 1821 * spin_lock_irqsave(host lock) 1822 * 1823 * RETURNS: 1824 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1825 * needs to be deferred. 1826 */ 1827 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1828 ata_xlat_func_t xlat_func) 1829 { 1830 struct ata_port *ap = dev->link->ap; 1831 struct ata_queued_cmd *qc; 1832 int rc; 1833 1834 VPRINTK("ENTER\n"); 1835 1836 qc = ata_scsi_qc_new(dev, cmd); 1837 if (!qc) 1838 goto err_mem; 1839 1840 /* data is present; dma-map it */ 1841 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1842 cmd->sc_data_direction == DMA_TO_DEVICE) { 1843 if (unlikely(scsi_bufflen(cmd) < 1)) { 1844 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1845 goto err_did; 1846 } 1847 1848 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1849 1850 qc->dma_dir = cmd->sc_data_direction; 1851 } 1852 1853 qc->complete_fn = ata_scsi_qc_complete; 1854 1855 if (xlat_func(qc)) 1856 goto early_finish; 1857 1858 if (ap->ops->qc_defer) { 1859 if ((rc = ap->ops->qc_defer(qc))) 1860 goto defer; 1861 } 1862 1863 /* select device, send command to hardware */ 1864 ata_qc_issue(qc); 1865 1866 VPRINTK("EXIT\n"); 1867 return 0; 1868 1869 early_finish: 1870 ata_qc_free(qc); 1871 cmd->scsi_done(cmd); 1872 DPRINTK("EXIT - early finish (good or error)\n"); 1873 return 0; 1874 1875 err_did: 1876 ata_qc_free(qc); 1877 cmd->result = (DID_ERROR << 16); 1878 cmd->scsi_done(cmd); 1879 err_mem: 1880 DPRINTK("EXIT - internal\n"); 1881 return 0; 1882 1883 defer: 1884 ata_qc_free(qc); 1885 DPRINTK("EXIT - defer\n"); 1886 if (rc == ATA_DEFER_LINK) 1887 return SCSI_MLQUEUE_DEVICE_BUSY; 1888 else 1889 return SCSI_MLQUEUE_HOST_BUSY; 1890 } 1891 1892 /** 1893 * ata_scsi_rbuf_get - Map response buffer. 1894 * @cmd: SCSI command containing buffer to be mapped. 1895 * @flags: unsigned long variable to store irq enable status 1896 * @copy_in: copy in from user buffer 1897 * 1898 * Prepare buffer for simulated SCSI commands. 1899 * 1900 * LOCKING: 1901 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1902 * 1903 * RETURNS: 1904 * Pointer to response buffer. 1905 */ 1906 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1907 unsigned long *flags) 1908 { 1909 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1910 1911 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1912 if (copy_in) 1913 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1914 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1915 return ata_scsi_rbuf; 1916 } 1917 1918 /** 1919 * ata_scsi_rbuf_put - Unmap response buffer. 1920 * @cmd: SCSI command containing buffer to be unmapped. 1921 * @copy_out: copy out result 1922 * @flags: @flags passed to ata_scsi_rbuf_get() 1923 * 1924 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1925 * @copy_back is true. 1926 * 1927 * LOCKING: 1928 * Unlocks ata_scsi_rbuf_lock. 1929 */ 1930 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1931 unsigned long *flags) 1932 { 1933 if (copy_out) 1934 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1935 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1936 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1937 } 1938 1939 /** 1940 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1941 * @args: device IDENTIFY data / SCSI command of interest. 1942 * @actor: Callback hook for desired SCSI command simulator 1943 * 1944 * Takes care of the hard work of simulating a SCSI command... 1945 * Mapping the response buffer, calling the command's handler, 1946 * and handling the handler's return value. This return value 1947 * indicates whether the handler wishes the SCSI command to be 1948 * completed successfully (0), or not (in which case cmd->result 1949 * and sense buffer are assumed to be set). 1950 * 1951 * LOCKING: 1952 * spin_lock_irqsave(host lock) 1953 */ 1954 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1955 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1956 { 1957 u8 *rbuf; 1958 unsigned int rc; 1959 struct scsi_cmnd *cmd = args->cmd; 1960 unsigned long flags; 1961 1962 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1963 rc = actor(args, rbuf); 1964 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1965 1966 if (rc == 0) 1967 cmd->result = SAM_STAT_GOOD; 1968 args->done(cmd); 1969 } 1970 1971 /** 1972 * ata_scsiop_inq_std - Simulate INQUIRY command 1973 * @args: device IDENTIFY data / SCSI command of interest. 1974 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1975 * 1976 * Returns standard device identification data associated 1977 * with non-VPD INQUIRY command output. 1978 * 1979 * LOCKING: 1980 * spin_lock_irqsave(host lock) 1981 */ 1982 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1983 { 1984 const u8 versions[] = { 1985 0x00, 1986 0x60, /* SAM-3 (no version claimed) */ 1987 1988 0x03, 1989 0x20, /* SBC-2 (no version claimed) */ 1990 1991 0x02, 1992 0x60 /* SPC-3 (no version claimed) */ 1993 }; 1994 const u8 versions_zbc[] = { 1995 0x00, 1996 0xA0, /* SAM-5 (no version claimed) */ 1997 1998 0x04, 1999 0xC0, /* SBC-3 (no version claimed) */ 2000 2001 0x04, 2002 0x60, /* SPC-4 (no version claimed) */ 2003 2004 0x60, 2005 0x20, /* ZBC (no version claimed) */ 2006 }; 2007 2008 u8 hdr[] = { 2009 TYPE_DISK, 2010 0, 2011 0x5, /* claim SPC-3 version compatibility */ 2012 2, 2013 95 - 4 2014 }; 2015 2016 VPRINTK("ENTER\n"); 2017 2018 /* set scsi removable (RMB) bit per ata bit */ 2019 if (ata_id_removable(args->id)) 2020 hdr[1] |= (1 << 7); 2021 2022 if (args->dev->class == ATA_DEV_ZAC) { 2023 hdr[0] = TYPE_ZBC; 2024 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */ 2025 } 2026 2027 memcpy(rbuf, hdr, sizeof(hdr)); 2028 memcpy(&rbuf[8], "ATA ", 8); 2029 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 2030 2031 /* From SAT, use last 2 words from fw rev unless they are spaces */ 2032 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 2033 if (strncmp(&rbuf[32], " ", 4) == 0) 2034 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2035 2036 if (rbuf[32] == 0 || rbuf[32] == ' ') 2037 memcpy(&rbuf[32], "n/a ", 4); 2038 2039 if (args->dev->class == ATA_DEV_ZAC) 2040 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 2041 else 2042 memcpy(rbuf + 58, versions, sizeof(versions)); 2043 2044 return 0; 2045 } 2046 2047 /** 2048 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2049 * @args: device IDENTIFY data / SCSI command of interest. 2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2051 * 2052 * Returns list of inquiry VPD pages available. 2053 * 2054 * LOCKING: 2055 * spin_lock_irqsave(host lock) 2056 */ 2057 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2058 { 2059 const u8 pages[] = { 2060 0x00, /* page 0x00, this page */ 2061 0x80, /* page 0x80, unit serial no page */ 2062 0x83, /* page 0x83, device ident page */ 2063 0x89, /* page 0x89, ata info page */ 2064 0xb0, /* page 0xb0, block limits page */ 2065 0xb1, /* page 0xb1, block device characteristics page */ 2066 0xb2, /* page 0xb2, thin provisioning page */ 2067 }; 2068 2069 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2070 memcpy(rbuf + 4, pages, sizeof(pages)); 2071 return 0; 2072 } 2073 2074 /** 2075 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2076 * @args: device IDENTIFY data / SCSI command of interest. 2077 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2078 * 2079 * Returns ATA device serial number. 2080 * 2081 * LOCKING: 2082 * spin_lock_irqsave(host lock) 2083 */ 2084 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2085 { 2086 const u8 hdr[] = { 2087 0, 2088 0x80, /* this page code */ 2089 0, 2090 ATA_ID_SERNO_LEN, /* page len */ 2091 }; 2092 2093 memcpy(rbuf, hdr, sizeof(hdr)); 2094 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2095 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2096 return 0; 2097 } 2098 2099 /** 2100 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2101 * @args: device IDENTIFY data / SCSI command of interest. 2102 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2103 * 2104 * Yields two logical unit device identification designators: 2105 * - vendor specific ASCII containing the ATA serial number 2106 * - SAT defined "t10 vendor id based" containing ASCII vendor 2107 * name ("ATA "), model and serial numbers. 2108 * 2109 * LOCKING: 2110 * spin_lock_irqsave(host lock) 2111 */ 2112 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2113 { 2114 const int sat_model_serial_desc_len = 68; 2115 int num; 2116 2117 rbuf[1] = 0x83; /* this page code */ 2118 num = 4; 2119 2120 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2121 rbuf[num + 0] = 2; 2122 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2123 num += 4; 2124 ata_id_string(args->id, (unsigned char *) rbuf + num, 2125 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2126 num += ATA_ID_SERNO_LEN; 2127 2128 /* SAT defined lu model and serial numbers descriptor */ 2129 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2130 rbuf[num + 0] = 2; 2131 rbuf[num + 1] = 1; 2132 rbuf[num + 3] = sat_model_serial_desc_len; 2133 num += 4; 2134 memcpy(rbuf + num, "ATA ", 8); 2135 num += 8; 2136 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2137 ATA_ID_PROD_LEN); 2138 num += ATA_ID_PROD_LEN; 2139 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2140 ATA_ID_SERNO_LEN); 2141 num += ATA_ID_SERNO_LEN; 2142 2143 if (ata_id_has_wwn(args->id)) { 2144 /* SAT defined lu world wide name */ 2145 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2146 rbuf[num + 0] = 1; 2147 rbuf[num + 1] = 3; 2148 rbuf[num + 3] = ATA_ID_WWN_LEN; 2149 num += 4; 2150 ata_id_string(args->id, (unsigned char *) rbuf + num, 2151 ATA_ID_WWN, ATA_ID_WWN_LEN); 2152 num += ATA_ID_WWN_LEN; 2153 } 2154 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2155 return 0; 2156 } 2157 2158 /** 2159 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2160 * @args: device IDENTIFY data / SCSI command of interest. 2161 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2162 * 2163 * Yields SAT-specified ATA VPD page. 2164 * 2165 * LOCKING: 2166 * spin_lock_irqsave(host lock) 2167 */ 2168 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2169 { 2170 struct ata_taskfile tf; 2171 2172 memset(&tf, 0, sizeof(tf)); 2173 2174 rbuf[1] = 0x89; /* our page code */ 2175 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2176 rbuf[3] = (0x238 & 0xff); 2177 2178 memcpy(&rbuf[8], "linux ", 8); 2179 memcpy(&rbuf[16], "libata ", 16); 2180 memcpy(&rbuf[32], DRV_VERSION, 4); 2181 2182 /* we don't store the ATA device signature, so we fake it */ 2183 2184 tf.command = ATA_DRDY; /* really, this is Status reg */ 2185 tf.lbal = 0x1; 2186 tf.nsect = 0x1; 2187 2188 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2189 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2190 2191 rbuf[56] = ATA_CMD_ID_ATA; 2192 2193 memcpy(&rbuf[60], &args->id[0], 512); 2194 return 0; 2195 } 2196 2197 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2198 { 2199 u16 min_io_sectors; 2200 2201 rbuf[1] = 0xb0; 2202 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2203 2204 /* 2205 * Optimal transfer length granularity. 2206 * 2207 * This is always one physical block, but for disks with a smaller 2208 * logical than physical sector size we need to figure out what the 2209 * latter is. 2210 */ 2211 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2212 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2213 2214 /* 2215 * Optimal unmap granularity. 2216 * 2217 * The ATA spec doesn't even know about a granularity or alignment 2218 * for the TRIM command. We can leave away most of the unmap related 2219 * VPD page entries, but we have specifify a granularity to signal 2220 * that we support some form of unmap - in thise case via WRITE SAME 2221 * with the unmap bit set. 2222 */ 2223 if (ata_id_has_trim(args->id)) { 2224 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2225 put_unaligned_be32(1, &rbuf[28]); 2226 } 2227 2228 return 0; 2229 } 2230 2231 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2232 { 2233 int form_factor = ata_id_form_factor(args->id); 2234 int media_rotation_rate = ata_id_rotation_rate(args->id); 2235 2236 rbuf[1] = 0xb1; 2237 rbuf[3] = 0x3c; 2238 rbuf[4] = media_rotation_rate >> 8; 2239 rbuf[5] = media_rotation_rate; 2240 rbuf[7] = form_factor; 2241 2242 return 0; 2243 } 2244 2245 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2246 { 2247 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2248 rbuf[1] = 0xb2; 2249 rbuf[3] = 0x4; 2250 rbuf[5] = 1 << 6; /* TPWS */ 2251 2252 return 0; 2253 } 2254 2255 /** 2256 * ata_scsiop_noop - Command handler that simply returns success. 2257 * @args: device IDENTIFY data / SCSI command of interest. 2258 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2259 * 2260 * No operation. Simply returns success to caller, to indicate 2261 * that the caller should successfully complete this SCSI command. 2262 * 2263 * LOCKING: 2264 * spin_lock_irqsave(host lock) 2265 */ 2266 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2267 { 2268 VPRINTK("ENTER\n"); 2269 return 0; 2270 } 2271 2272 /** 2273 * modecpy - Prepare response for MODE SENSE 2274 * @dest: output buffer 2275 * @src: data being copied 2276 * @n: length of mode page 2277 * @changeable: whether changeable parameters are requested 2278 * 2279 * Generate a generic MODE SENSE page for either current or changeable 2280 * parameters. 2281 * 2282 * LOCKING: 2283 * None. 2284 */ 2285 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2286 { 2287 if (changeable) { 2288 memcpy(dest, src, 2); 2289 memset(dest + 2, 0, n - 2); 2290 } else { 2291 memcpy(dest, src, n); 2292 } 2293 } 2294 2295 /** 2296 * ata_msense_caching - Simulate MODE SENSE caching info page 2297 * @id: device IDENTIFY data 2298 * @buf: output buffer 2299 * @changeable: whether changeable parameters are requested 2300 * 2301 * Generate a caching info page, which conditionally indicates 2302 * write caching to the SCSI layer, depending on device 2303 * capabilities. 2304 * 2305 * LOCKING: 2306 * None. 2307 */ 2308 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2309 { 2310 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2311 if (changeable || ata_id_wcache_enabled(id)) 2312 buf[2] |= (1 << 2); /* write cache enable */ 2313 if (!changeable && !ata_id_rahead_enabled(id)) 2314 buf[12] |= (1 << 5); /* disable read ahead */ 2315 return sizeof(def_cache_mpage); 2316 } 2317 2318 /** 2319 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2320 * @buf: output buffer 2321 * @changeable: whether changeable parameters are requested 2322 * 2323 * Generate a generic MODE SENSE control mode page. 2324 * 2325 * LOCKING: 2326 * None. 2327 */ 2328 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2329 { 2330 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2331 return sizeof(def_control_mpage); 2332 } 2333 2334 /** 2335 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2336 * @buf: output buffer 2337 * @changeable: whether changeable parameters are requested 2338 * 2339 * Generate a generic MODE SENSE r/w error recovery page. 2340 * 2341 * LOCKING: 2342 * None. 2343 */ 2344 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2345 { 2346 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2347 changeable); 2348 return sizeof(def_rw_recovery_mpage); 2349 } 2350 2351 /* 2352 * We can turn this into a real blacklist if it's needed, for now just 2353 * blacklist any Maxtor BANC1G10 revision firmware 2354 */ 2355 static int ata_dev_supports_fua(u16 *id) 2356 { 2357 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2358 2359 if (!libata_fua) 2360 return 0; 2361 if (!ata_id_has_fua(id)) 2362 return 0; 2363 2364 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2365 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2366 2367 if (strcmp(model, "Maxtor")) 2368 return 1; 2369 if (strcmp(fw, "BANC1G10")) 2370 return 1; 2371 2372 return 0; /* blacklisted */ 2373 } 2374 2375 /** 2376 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2377 * @args: device IDENTIFY data / SCSI command of interest. 2378 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2379 * 2380 * Simulate MODE SENSE commands. Assume this is invoked for direct 2381 * access devices (e.g. disks) only. There should be no block 2382 * descriptor for other device types. 2383 * 2384 * LOCKING: 2385 * spin_lock_irqsave(host lock) 2386 */ 2387 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2388 { 2389 struct ata_device *dev = args->dev; 2390 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2391 const u8 sat_blk_desc[] = { 2392 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2393 0, 2394 0, 0x2, 0x0 /* block length: 512 bytes */ 2395 }; 2396 u8 pg, spg; 2397 unsigned int ebd, page_control, six_byte; 2398 u8 dpofua; 2399 2400 VPRINTK("ENTER\n"); 2401 2402 six_byte = (scsicmd[0] == MODE_SENSE); 2403 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2404 /* 2405 * LLBA bit in msense(10) ignored (compliant) 2406 */ 2407 2408 page_control = scsicmd[2] >> 6; 2409 switch (page_control) { 2410 case 0: /* current */ 2411 case 1: /* changeable */ 2412 case 2: /* defaults */ 2413 break; /* supported */ 2414 case 3: /* saved */ 2415 goto saving_not_supp; 2416 default: 2417 goto invalid_fld; 2418 } 2419 2420 if (six_byte) 2421 p += 4 + (ebd ? 8 : 0); 2422 else 2423 p += 8 + (ebd ? 8 : 0); 2424 2425 pg = scsicmd[2] & 0x3f; 2426 spg = scsicmd[3]; 2427 /* 2428 * No mode subpages supported (yet) but asking for _all_ 2429 * subpages may be valid 2430 */ 2431 if (spg && (spg != ALL_SUB_MPAGES)) 2432 goto invalid_fld; 2433 2434 switch(pg) { 2435 case RW_RECOVERY_MPAGE: 2436 p += ata_msense_rw_recovery(p, page_control == 1); 2437 break; 2438 2439 case CACHE_MPAGE: 2440 p += ata_msense_caching(args->id, p, page_control == 1); 2441 break; 2442 2443 case CONTROL_MPAGE: 2444 p += ata_msense_ctl_mode(p, page_control == 1); 2445 break; 2446 2447 case ALL_MPAGES: 2448 p += ata_msense_rw_recovery(p, page_control == 1); 2449 p += ata_msense_caching(args->id, p, page_control == 1); 2450 p += ata_msense_ctl_mode(p, page_control == 1); 2451 break; 2452 2453 default: /* invalid page code */ 2454 goto invalid_fld; 2455 } 2456 2457 dpofua = 0; 2458 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2459 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2460 dpofua = 1 << 4; 2461 2462 if (six_byte) { 2463 rbuf[0] = p - rbuf - 1; 2464 rbuf[2] |= dpofua; 2465 if (ebd) { 2466 rbuf[3] = sizeof(sat_blk_desc); 2467 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2468 } 2469 } else { 2470 unsigned int output_len = p - rbuf - 2; 2471 2472 rbuf[0] = output_len >> 8; 2473 rbuf[1] = output_len; 2474 rbuf[3] |= dpofua; 2475 if (ebd) { 2476 rbuf[7] = sizeof(sat_blk_desc); 2477 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2478 } 2479 } 2480 return 0; 2481 2482 invalid_fld: 2483 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2484 /* "Invalid field in cbd" */ 2485 return 1; 2486 2487 saving_not_supp: 2488 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2489 /* "Saving parameters not supported" */ 2490 return 1; 2491 } 2492 2493 /** 2494 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2495 * @args: device IDENTIFY data / SCSI command of interest. 2496 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2497 * 2498 * Simulate READ CAPACITY commands. 2499 * 2500 * LOCKING: 2501 * None. 2502 */ 2503 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2504 { 2505 struct ata_device *dev = args->dev; 2506 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2507 u32 sector_size; /* physical sector size in bytes */ 2508 u8 log2_per_phys; 2509 u16 lowest_aligned; 2510 2511 sector_size = ata_id_logical_sector_size(dev->id); 2512 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2513 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2514 2515 VPRINTK("ENTER\n"); 2516 2517 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2518 if (last_lba >= 0xffffffffULL) 2519 last_lba = 0xffffffff; 2520 2521 /* sector count, 32-bit */ 2522 rbuf[0] = last_lba >> (8 * 3); 2523 rbuf[1] = last_lba >> (8 * 2); 2524 rbuf[2] = last_lba >> (8 * 1); 2525 rbuf[3] = last_lba; 2526 2527 /* sector size */ 2528 rbuf[4] = sector_size >> (8 * 3); 2529 rbuf[5] = sector_size >> (8 * 2); 2530 rbuf[6] = sector_size >> (8 * 1); 2531 rbuf[7] = sector_size; 2532 } else { 2533 /* sector count, 64-bit */ 2534 rbuf[0] = last_lba >> (8 * 7); 2535 rbuf[1] = last_lba >> (8 * 6); 2536 rbuf[2] = last_lba >> (8 * 5); 2537 rbuf[3] = last_lba >> (8 * 4); 2538 rbuf[4] = last_lba >> (8 * 3); 2539 rbuf[5] = last_lba >> (8 * 2); 2540 rbuf[6] = last_lba >> (8 * 1); 2541 rbuf[7] = last_lba; 2542 2543 /* sector size */ 2544 rbuf[ 8] = sector_size >> (8 * 3); 2545 rbuf[ 9] = sector_size >> (8 * 2); 2546 rbuf[10] = sector_size >> (8 * 1); 2547 rbuf[11] = sector_size; 2548 2549 rbuf[12] = 0; 2550 rbuf[13] = log2_per_phys; 2551 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2552 rbuf[15] = lowest_aligned; 2553 2554 if (ata_id_has_trim(args->id) && 2555 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2556 rbuf[14] |= 0x80; /* LBPME */ 2557 2558 if (ata_id_has_zero_after_trim(args->id) && 2559 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2560 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2561 rbuf[14] |= 0x40; /* LBPRZ */ 2562 } 2563 } 2564 } 2565 return 0; 2566 } 2567 2568 /** 2569 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2570 * @args: device IDENTIFY data / SCSI command of interest. 2571 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2572 * 2573 * Simulate REPORT LUNS command. 2574 * 2575 * LOCKING: 2576 * spin_lock_irqsave(host lock) 2577 */ 2578 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2579 { 2580 VPRINTK("ENTER\n"); 2581 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2582 2583 return 0; 2584 } 2585 2586 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2587 { 2588 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2589 /* FIXME: not quite right; we don't want the 2590 * translation of taskfile registers into 2591 * a sense descriptors, since that's only 2592 * correct for ATA, not ATAPI 2593 */ 2594 ata_gen_passthru_sense(qc); 2595 } 2596 2597 qc->scsidone(qc->scsicmd); 2598 ata_qc_free(qc); 2599 } 2600 2601 /* is it pointless to prefer PIO for "safety reasons"? */ 2602 static inline int ata_pio_use_silly(struct ata_port *ap) 2603 { 2604 return (ap->flags & ATA_FLAG_PIO_DMA); 2605 } 2606 2607 static void atapi_request_sense(struct ata_queued_cmd *qc) 2608 { 2609 struct ata_port *ap = qc->ap; 2610 struct scsi_cmnd *cmd = qc->scsicmd; 2611 2612 DPRINTK("ATAPI request sense\n"); 2613 2614 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2615 2616 #ifdef CONFIG_ATA_SFF 2617 if (ap->ops->sff_tf_read) 2618 ap->ops->sff_tf_read(ap, &qc->tf); 2619 #endif 2620 2621 /* fill these in, for the case where they are -not- overwritten */ 2622 cmd->sense_buffer[0] = 0x70; 2623 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2624 2625 ata_qc_reinit(qc); 2626 2627 /* setup sg table and init transfer direction */ 2628 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2629 ata_sg_init(qc, &qc->sgent, 1); 2630 qc->dma_dir = DMA_FROM_DEVICE; 2631 2632 memset(&qc->cdb, 0, qc->dev->cdb_len); 2633 qc->cdb[0] = REQUEST_SENSE; 2634 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2635 2636 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2637 qc->tf.command = ATA_CMD_PACKET; 2638 2639 if (ata_pio_use_silly(ap)) { 2640 qc->tf.protocol = ATAPI_PROT_DMA; 2641 qc->tf.feature |= ATAPI_PKT_DMA; 2642 } else { 2643 qc->tf.protocol = ATAPI_PROT_PIO; 2644 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2645 qc->tf.lbah = 0; 2646 } 2647 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2648 2649 qc->complete_fn = atapi_sense_complete; 2650 2651 ata_qc_issue(qc); 2652 2653 DPRINTK("EXIT\n"); 2654 } 2655 2656 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2657 { 2658 struct scsi_cmnd *cmd = qc->scsicmd; 2659 unsigned int err_mask = qc->err_mask; 2660 2661 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2662 2663 /* handle completion from new EH */ 2664 if (unlikely(qc->ap->ops->error_handler && 2665 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2666 2667 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2668 /* FIXME: not quite right; we don't want the 2669 * translation of taskfile registers into a 2670 * sense descriptors, since that's only 2671 * correct for ATA, not ATAPI 2672 */ 2673 ata_gen_passthru_sense(qc); 2674 } 2675 2676 /* SCSI EH automatically locks door if sdev->locked is 2677 * set. Sometimes door lock request continues to 2678 * fail, for example, when no media is present. This 2679 * creates a loop - SCSI EH issues door lock which 2680 * fails and gets invoked again to acquire sense data 2681 * for the failed command. 2682 * 2683 * If door lock fails, always clear sdev->locked to 2684 * avoid this infinite loop. 2685 * 2686 * This may happen before SCSI scan is complete. Make 2687 * sure qc->dev->sdev isn't NULL before dereferencing. 2688 */ 2689 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2690 qc->dev->sdev->locked = 0; 2691 2692 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2693 qc->scsidone(cmd); 2694 ata_qc_free(qc); 2695 return; 2696 } 2697 2698 /* successful completion or old EH failure path */ 2699 if (unlikely(err_mask & AC_ERR_DEV)) { 2700 cmd->result = SAM_STAT_CHECK_CONDITION; 2701 atapi_request_sense(qc); 2702 return; 2703 } else if (unlikely(err_mask)) { 2704 /* FIXME: not quite right; we don't want the 2705 * translation of taskfile registers into 2706 * a sense descriptors, since that's only 2707 * correct for ATA, not ATAPI 2708 */ 2709 ata_gen_passthru_sense(qc); 2710 } else { 2711 u8 *scsicmd = cmd->cmnd; 2712 2713 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2714 unsigned long flags; 2715 u8 *buf; 2716 2717 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2718 2719 /* ATAPI devices typically report zero for their SCSI version, 2720 * and sometimes deviate from the spec WRT response data 2721 * format. If SCSI version is reported as zero like normal, 2722 * then we make the following fixups: 1) Fake MMC-5 version, 2723 * to indicate to the Linux scsi midlayer this is a modern 2724 * device. 2) Ensure response data format / ATAPI information 2725 * are always correct. 2726 */ 2727 if (buf[2] == 0) { 2728 buf[2] = 0x5; 2729 buf[3] = 0x32; 2730 } 2731 2732 ata_scsi_rbuf_put(cmd, true, &flags); 2733 } 2734 2735 cmd->result = SAM_STAT_GOOD; 2736 } 2737 2738 qc->scsidone(cmd); 2739 ata_qc_free(qc); 2740 } 2741 /** 2742 * atapi_xlat - Initialize PACKET taskfile 2743 * @qc: command structure to be initialized 2744 * 2745 * LOCKING: 2746 * spin_lock_irqsave(host lock) 2747 * 2748 * RETURNS: 2749 * Zero on success, non-zero on failure. 2750 */ 2751 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2752 { 2753 struct scsi_cmnd *scmd = qc->scsicmd; 2754 struct ata_device *dev = qc->dev; 2755 int nodata = (scmd->sc_data_direction == DMA_NONE); 2756 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2757 unsigned int nbytes; 2758 2759 memset(qc->cdb, 0, dev->cdb_len); 2760 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2761 2762 qc->complete_fn = atapi_qc_complete; 2763 2764 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2765 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2766 qc->tf.flags |= ATA_TFLAG_WRITE; 2767 DPRINTK("direction: write\n"); 2768 } 2769 2770 qc->tf.command = ATA_CMD_PACKET; 2771 ata_qc_set_pc_nbytes(qc); 2772 2773 /* check whether ATAPI DMA is safe */ 2774 if (!nodata && !using_pio && atapi_check_dma(qc)) 2775 using_pio = 1; 2776 2777 /* Some controller variants snoop this value for Packet 2778 * transfers to do state machine and FIFO management. Thus we 2779 * want to set it properly, and for DMA where it is 2780 * effectively meaningless. 2781 */ 2782 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2783 2784 /* Most ATAPI devices which honor transfer chunk size don't 2785 * behave according to the spec when odd chunk size which 2786 * matches the transfer length is specified. If the number of 2787 * bytes to transfer is 2n+1. According to the spec, what 2788 * should happen is to indicate that 2n+1 is going to be 2789 * transferred and transfer 2n+2 bytes where the last byte is 2790 * padding. 2791 * 2792 * In practice, this doesn't happen. ATAPI devices first 2793 * indicate and transfer 2n bytes and then indicate and 2794 * transfer 2 bytes where the last byte is padding. 2795 * 2796 * This inconsistency confuses several controllers which 2797 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2798 * These controllers use actual number of transferred bytes to 2799 * update DMA poitner and transfer of 4n+2 bytes make those 2800 * controller push DMA pointer by 4n+4 bytes because SATA data 2801 * FISes are aligned to 4 bytes. This causes data corruption 2802 * and buffer overrun. 2803 * 2804 * Always setting nbytes to even number solves this problem 2805 * because then ATAPI devices don't have to split data at 2n 2806 * boundaries. 2807 */ 2808 if (nbytes & 0x1) 2809 nbytes++; 2810 2811 qc->tf.lbam = (nbytes & 0xFF); 2812 qc->tf.lbah = (nbytes >> 8); 2813 2814 if (nodata) 2815 qc->tf.protocol = ATAPI_PROT_NODATA; 2816 else if (using_pio) 2817 qc->tf.protocol = ATAPI_PROT_PIO; 2818 else { 2819 /* DMA data xfer */ 2820 qc->tf.protocol = ATAPI_PROT_DMA; 2821 qc->tf.feature |= ATAPI_PKT_DMA; 2822 2823 if ((dev->flags & ATA_DFLAG_DMADIR) && 2824 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2825 /* some SATA bridges need us to indicate data xfer direction */ 2826 qc->tf.feature |= ATAPI_DMADIR; 2827 } 2828 2829 2830 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2831 as ATAPI tape drives don't get this right otherwise */ 2832 return 0; 2833 } 2834 2835 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2836 { 2837 if (!sata_pmp_attached(ap)) { 2838 if (likely(devno < ata_link_max_devices(&ap->link))) 2839 return &ap->link.device[devno]; 2840 } else { 2841 if (likely(devno < ap->nr_pmp_links)) 2842 return &ap->pmp_link[devno].device[0]; 2843 } 2844 2845 return NULL; 2846 } 2847 2848 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2849 const struct scsi_device *scsidev) 2850 { 2851 int devno; 2852 2853 /* skip commands not addressed to targets we simulate */ 2854 if (!sata_pmp_attached(ap)) { 2855 if (unlikely(scsidev->channel || scsidev->lun)) 2856 return NULL; 2857 devno = scsidev->id; 2858 } else { 2859 if (unlikely(scsidev->id || scsidev->lun)) 2860 return NULL; 2861 devno = scsidev->channel; 2862 } 2863 2864 return ata_find_dev(ap, devno); 2865 } 2866 2867 /** 2868 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2869 * @ap: ATA port to which the device is attached 2870 * @scsidev: SCSI device from which we derive the ATA device 2871 * 2872 * Given various information provided in struct scsi_cmnd, 2873 * map that onto an ATA bus, and using that mapping 2874 * determine which ata_device is associated with the 2875 * SCSI command to be sent. 2876 * 2877 * LOCKING: 2878 * spin_lock_irqsave(host lock) 2879 * 2880 * RETURNS: 2881 * Associated ATA device, or %NULL if not found. 2882 */ 2883 static struct ata_device * 2884 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2885 { 2886 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2887 2888 if (unlikely(!dev || !ata_dev_enabled(dev))) 2889 return NULL; 2890 2891 return dev; 2892 } 2893 2894 /* 2895 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2896 * @byte1: Byte 1 from pass-thru CDB. 2897 * 2898 * RETURNS: 2899 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2900 */ 2901 static u8 2902 ata_scsi_map_proto(u8 byte1) 2903 { 2904 switch((byte1 & 0x1e) >> 1) { 2905 case 3: /* Non-data */ 2906 return ATA_PROT_NODATA; 2907 2908 case 6: /* DMA */ 2909 case 10: /* UDMA Data-in */ 2910 case 11: /* UDMA Data-Out */ 2911 return ATA_PROT_DMA; 2912 2913 case 4: /* PIO Data-in */ 2914 case 5: /* PIO Data-out */ 2915 return ATA_PROT_PIO; 2916 2917 case 0: /* Hard Reset */ 2918 case 1: /* SRST */ 2919 case 8: /* Device Diagnostic */ 2920 case 9: /* Device Reset */ 2921 case 7: /* DMA Queued */ 2922 case 12: /* FPDMA */ 2923 case 15: /* Return Response Info */ 2924 default: /* Reserved */ 2925 break; 2926 } 2927 2928 return ATA_PROT_UNKNOWN; 2929 } 2930 2931 /** 2932 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2933 * @qc: command structure to be initialized 2934 * 2935 * Handles either 12 or 16-byte versions of the CDB. 2936 * 2937 * RETURNS: 2938 * Zero on success, non-zero on failure. 2939 */ 2940 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2941 { 2942 struct ata_taskfile *tf = &(qc->tf); 2943 struct scsi_cmnd *scmd = qc->scsicmd; 2944 struct ata_device *dev = qc->dev; 2945 const u8 *cdb = scmd->cmnd; 2946 2947 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2948 goto invalid_fld; 2949 2950 /* 2951 * 12 and 16 byte CDBs use different offsets to 2952 * provide the various register values. 2953 */ 2954 if (cdb[0] == ATA_16) { 2955 /* 2956 * 16-byte CDB - may contain extended commands. 2957 * 2958 * If that is the case, copy the upper byte register values. 2959 */ 2960 if (cdb[1] & 0x01) { 2961 tf->hob_feature = cdb[3]; 2962 tf->hob_nsect = cdb[5]; 2963 tf->hob_lbal = cdb[7]; 2964 tf->hob_lbam = cdb[9]; 2965 tf->hob_lbah = cdb[11]; 2966 tf->flags |= ATA_TFLAG_LBA48; 2967 } else 2968 tf->flags &= ~ATA_TFLAG_LBA48; 2969 2970 /* 2971 * Always copy low byte, device and command registers. 2972 */ 2973 tf->feature = cdb[4]; 2974 tf->nsect = cdb[6]; 2975 tf->lbal = cdb[8]; 2976 tf->lbam = cdb[10]; 2977 tf->lbah = cdb[12]; 2978 tf->device = cdb[13]; 2979 tf->command = cdb[14]; 2980 } else { 2981 /* 2982 * 12-byte CDB - incapable of extended commands. 2983 */ 2984 tf->flags &= ~ATA_TFLAG_LBA48; 2985 2986 tf->feature = cdb[3]; 2987 tf->nsect = cdb[4]; 2988 tf->lbal = cdb[5]; 2989 tf->lbam = cdb[6]; 2990 tf->lbah = cdb[7]; 2991 tf->device = cdb[8]; 2992 tf->command = cdb[9]; 2993 } 2994 2995 /* enforce correct master/slave bit */ 2996 tf->device = dev->devno ? 2997 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2998 2999 switch (tf->command) { 3000 /* READ/WRITE LONG use a non-standard sect_size */ 3001 case ATA_CMD_READ_LONG: 3002 case ATA_CMD_READ_LONG_ONCE: 3003 case ATA_CMD_WRITE_LONG: 3004 case ATA_CMD_WRITE_LONG_ONCE: 3005 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 3006 goto invalid_fld; 3007 qc->sect_size = scsi_bufflen(scmd); 3008 break; 3009 3010 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 3011 case ATA_CMD_CFA_WRITE_NE: 3012 case ATA_CMD_CFA_TRANS_SECT: 3013 case ATA_CMD_CFA_WRITE_MULT_NE: 3014 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 3015 case ATA_CMD_READ: 3016 case ATA_CMD_READ_EXT: 3017 case ATA_CMD_READ_QUEUED: 3018 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 3019 case ATA_CMD_FPDMA_READ: 3020 case ATA_CMD_READ_MULTI: 3021 case ATA_CMD_READ_MULTI_EXT: 3022 case ATA_CMD_PIO_READ: 3023 case ATA_CMD_PIO_READ_EXT: 3024 case ATA_CMD_READ_STREAM_DMA_EXT: 3025 case ATA_CMD_READ_STREAM_EXT: 3026 case ATA_CMD_VERIFY: 3027 case ATA_CMD_VERIFY_EXT: 3028 case ATA_CMD_WRITE: 3029 case ATA_CMD_WRITE_EXT: 3030 case ATA_CMD_WRITE_FUA_EXT: 3031 case ATA_CMD_WRITE_QUEUED: 3032 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 3033 case ATA_CMD_FPDMA_WRITE: 3034 case ATA_CMD_WRITE_MULTI: 3035 case ATA_CMD_WRITE_MULTI_EXT: 3036 case ATA_CMD_WRITE_MULTI_FUA_EXT: 3037 case ATA_CMD_PIO_WRITE: 3038 case ATA_CMD_PIO_WRITE_EXT: 3039 case ATA_CMD_WRITE_STREAM_DMA_EXT: 3040 case ATA_CMD_WRITE_STREAM_EXT: 3041 qc->sect_size = scmd->device->sector_size; 3042 break; 3043 3044 /* Everything else uses 512 byte "sectors" */ 3045 default: 3046 qc->sect_size = ATA_SECT_SIZE; 3047 } 3048 3049 /* 3050 * Set flags so that all registers will be written, pass on 3051 * write indication (used for PIO/DMA setup), result TF is 3052 * copied back and we don't whine too much about its failure. 3053 */ 3054 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3055 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3056 tf->flags |= ATA_TFLAG_WRITE; 3057 3058 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3059 3060 /* 3061 * Set transfer length. 3062 * 3063 * TODO: find out if we need to do more here to 3064 * cover scatter/gather case. 3065 */ 3066 ata_qc_set_pc_nbytes(qc); 3067 3068 /* We may not issue DMA commands if no DMA mode is set */ 3069 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3070 goto invalid_fld; 3071 3072 /* sanity check for pio multi commands */ 3073 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3074 goto invalid_fld; 3075 3076 if (is_multi_taskfile(tf)) { 3077 unsigned int multi_count = 1 << (cdb[1] >> 5); 3078 3079 /* compare the passed through multi_count 3080 * with the cached multi_count of libata 3081 */ 3082 if (multi_count != dev->multi_count) 3083 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3084 multi_count); 3085 } 3086 3087 /* 3088 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3089 * SET_FEATURES - XFER MODE must be preceded/succeeded 3090 * by an update to hardware-specific registers for each 3091 * controller (i.e. the reason for ->set_piomode(), 3092 * ->set_dmamode(), and ->post_set_mode() hooks). 3093 */ 3094 if (tf->command == ATA_CMD_SET_FEATURES && 3095 tf->feature == SETFEATURES_XFER) 3096 goto invalid_fld; 3097 3098 /* 3099 * Filter TPM commands by default. These provide an 3100 * essentially uncontrolled encrypted "back door" between 3101 * applications and the disk. Set libata.allow_tpm=1 if you 3102 * have a real reason for wanting to use them. This ensures 3103 * that installed software cannot easily mess stuff up without 3104 * user intent. DVR type users will probably ship with this enabled 3105 * for movie content management. 3106 * 3107 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3108 * for this and should do in future but that it is not sufficient as 3109 * DCS is an optional feature set. Thus we also do the software filter 3110 * so that we comply with the TC consortium stated goal that the user 3111 * can turn off TC features of their system. 3112 */ 3113 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3114 goto invalid_fld; 3115 3116 return 0; 3117 3118 invalid_fld: 3119 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3120 /* "Invalid field in cdb" */ 3121 return 1; 3122 } 3123 3124 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3125 { 3126 struct ata_taskfile *tf = &qc->tf; 3127 struct scsi_cmnd *scmd = qc->scsicmd; 3128 struct ata_device *dev = qc->dev; 3129 const u8 *cdb = scmd->cmnd; 3130 u64 block; 3131 u32 n_block; 3132 u32 size; 3133 void *buf; 3134 3135 /* we may not issue DMA commands if no DMA mode is set */ 3136 if (unlikely(!dev->dma_mode)) 3137 goto invalid_fld; 3138 3139 if (unlikely(scmd->cmd_len < 16)) 3140 goto invalid_fld; 3141 scsi_16_lba_len(cdb, &block, &n_block); 3142 3143 /* for now we only support WRITE SAME with the unmap bit set */ 3144 if (unlikely(!(cdb[1] & 0x8))) 3145 goto invalid_fld; 3146 3147 /* 3148 * WRITE SAME always has a sector sized buffer as payload, this 3149 * should never be a multiple entry S/G list. 3150 */ 3151 if (!scsi_sg_count(scmd)) 3152 goto invalid_fld; 3153 3154 buf = page_address(sg_page(scsi_sglist(scmd))); 3155 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3156 3157 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3158 /* Newer devices support queued TRIM commands */ 3159 tf->protocol = ATA_PROT_NCQ; 3160 tf->command = ATA_CMD_FPDMA_SEND; 3161 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3162 tf->nsect = qc->tag << 3; 3163 tf->hob_feature = (size / 512) >> 8; 3164 tf->feature = size / 512; 3165 3166 tf->auxiliary = 1; 3167 } else { 3168 tf->protocol = ATA_PROT_DMA; 3169 tf->hob_feature = 0; 3170 tf->feature = ATA_DSM_TRIM; 3171 tf->hob_nsect = (size / 512) >> 8; 3172 tf->nsect = size / 512; 3173 tf->command = ATA_CMD_DSM; 3174 } 3175 3176 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3177 ATA_TFLAG_WRITE; 3178 3179 ata_qc_set_pc_nbytes(qc); 3180 3181 return 0; 3182 3183 invalid_fld: 3184 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3185 /* "Invalid field in cdb" */ 3186 return 1; 3187 } 3188 3189 /** 3190 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3191 * @qc: Storage for translated ATA taskfile 3192 * @buf: input buffer 3193 * @len: number of valid bytes in the input buffer 3194 * 3195 * Prepare a taskfile to modify caching information for the device. 3196 * 3197 * LOCKING: 3198 * None. 3199 */ 3200 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3201 const u8 *buf, int len) 3202 { 3203 struct ata_taskfile *tf = &qc->tf; 3204 struct ata_device *dev = qc->dev; 3205 char mpage[CACHE_MPAGE_LEN]; 3206 u8 wce; 3207 3208 /* 3209 * The first two bytes of def_cache_mpage are a header, so offsets 3210 * in mpage are off by 2 compared to buf. Same for len. 3211 */ 3212 3213 if (len != CACHE_MPAGE_LEN - 2) 3214 return -EINVAL; 3215 3216 wce = buf[0] & (1 << 2); 3217 3218 /* 3219 * Check that read-only bits are not modified. 3220 */ 3221 ata_msense_caching(dev->id, mpage, false); 3222 mpage[2] &= ~(1 << 2); 3223 mpage[2] |= wce; 3224 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3225 return -EINVAL; 3226 3227 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3228 tf->protocol = ATA_PROT_NODATA; 3229 tf->nsect = 0; 3230 tf->command = ATA_CMD_SET_FEATURES; 3231 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3232 return 0; 3233 } 3234 3235 /** 3236 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3237 * @qc: Storage for translated ATA taskfile 3238 * 3239 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3240 * Assume this is invoked for direct access devices (e.g. disks) only. 3241 * There should be no block descriptor for other device types. 3242 * 3243 * LOCKING: 3244 * spin_lock_irqsave(host lock) 3245 */ 3246 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3247 { 3248 struct scsi_cmnd *scmd = qc->scsicmd; 3249 const u8 *cdb = scmd->cmnd; 3250 const u8 *p; 3251 u8 pg, spg; 3252 unsigned six_byte, pg_len, hdr_len, bd_len; 3253 int len; 3254 3255 VPRINTK("ENTER\n"); 3256 3257 six_byte = (cdb[0] == MODE_SELECT); 3258 if (six_byte) { 3259 if (scmd->cmd_len < 5) 3260 goto invalid_fld; 3261 3262 len = cdb[4]; 3263 hdr_len = 4; 3264 } else { 3265 if (scmd->cmd_len < 9) 3266 goto invalid_fld; 3267 3268 len = (cdb[7] << 8) + cdb[8]; 3269 hdr_len = 8; 3270 } 3271 3272 /* We only support PF=1, SP=0. */ 3273 if ((cdb[1] & 0x11) != 0x10) 3274 goto invalid_fld; 3275 3276 /* Test early for possible overrun. */ 3277 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3278 goto invalid_param_len; 3279 3280 p = page_address(sg_page(scsi_sglist(scmd))); 3281 3282 /* Move past header and block descriptors. */ 3283 if (len < hdr_len) 3284 goto invalid_param_len; 3285 3286 if (six_byte) 3287 bd_len = p[3]; 3288 else 3289 bd_len = (p[6] << 8) + p[7]; 3290 3291 len -= hdr_len; 3292 p += hdr_len; 3293 if (len < bd_len) 3294 goto invalid_param_len; 3295 if (bd_len != 0 && bd_len != 8) 3296 goto invalid_param; 3297 3298 len -= bd_len; 3299 p += bd_len; 3300 if (len == 0) 3301 goto skip; 3302 3303 /* Parse both possible formats for the mode page headers. */ 3304 pg = p[0] & 0x3f; 3305 if (p[0] & 0x40) { 3306 if (len < 4) 3307 goto invalid_param_len; 3308 3309 spg = p[1]; 3310 pg_len = (p[2] << 8) | p[3]; 3311 p += 4; 3312 len -= 4; 3313 } else { 3314 if (len < 2) 3315 goto invalid_param_len; 3316 3317 spg = 0; 3318 pg_len = p[1]; 3319 p += 2; 3320 len -= 2; 3321 } 3322 3323 /* 3324 * No mode subpages supported (yet) but asking for _all_ 3325 * subpages may be valid 3326 */ 3327 if (spg && (spg != ALL_SUB_MPAGES)) 3328 goto invalid_param; 3329 if (pg_len > len) 3330 goto invalid_param_len; 3331 3332 switch (pg) { 3333 case CACHE_MPAGE: 3334 if (ata_mselect_caching(qc, p, pg_len) < 0) 3335 goto invalid_param; 3336 break; 3337 3338 default: /* invalid page code */ 3339 goto invalid_param; 3340 } 3341 3342 /* 3343 * Only one page has changeable data, so we only support setting one 3344 * page at a time. 3345 */ 3346 if (len > pg_len) 3347 goto invalid_param; 3348 3349 return 0; 3350 3351 invalid_fld: 3352 /* "Invalid field in CDB" */ 3353 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3354 return 1; 3355 3356 invalid_param: 3357 /* "Invalid field in parameter list" */ 3358 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3359 return 1; 3360 3361 invalid_param_len: 3362 /* "Parameter list length error" */ 3363 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3364 return 1; 3365 3366 skip: 3367 scmd->result = SAM_STAT_GOOD; 3368 return 1; 3369 } 3370 3371 /** 3372 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3373 * @dev: ATA device 3374 * @cmd: SCSI command opcode to consider 3375 * 3376 * Look up the SCSI command given, and determine whether the 3377 * SCSI command is to be translated or simulated. 3378 * 3379 * RETURNS: 3380 * Pointer to translation function if possible, %NULL if not. 3381 */ 3382 3383 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3384 { 3385 switch (cmd) { 3386 case READ_6: 3387 case READ_10: 3388 case READ_16: 3389 3390 case WRITE_6: 3391 case WRITE_10: 3392 case WRITE_16: 3393 return ata_scsi_rw_xlat; 3394 3395 case WRITE_SAME_16: 3396 return ata_scsi_write_same_xlat; 3397 3398 case SYNCHRONIZE_CACHE: 3399 if (ata_try_flush_cache(dev)) 3400 return ata_scsi_flush_xlat; 3401 break; 3402 3403 case VERIFY: 3404 case VERIFY_16: 3405 return ata_scsi_verify_xlat; 3406 3407 case ATA_12: 3408 case ATA_16: 3409 return ata_scsi_pass_thru; 3410 3411 case MODE_SELECT: 3412 case MODE_SELECT_10: 3413 return ata_scsi_mode_select_xlat; 3414 break; 3415 3416 case START_STOP: 3417 return ata_scsi_start_stop_xlat; 3418 } 3419 3420 return NULL; 3421 } 3422 3423 /** 3424 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3425 * @ap: ATA port to which the command was being sent 3426 * @cmd: SCSI command to dump 3427 * 3428 * Prints the contents of a SCSI command via printk(). 3429 */ 3430 3431 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3432 struct scsi_cmnd *cmd) 3433 { 3434 #ifdef ATA_DEBUG 3435 struct scsi_device *scsidev = cmd->device; 3436 u8 *scsicmd = cmd->cmnd; 3437 3438 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3439 ap->print_id, 3440 scsidev->channel, scsidev->id, scsidev->lun, 3441 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3442 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3443 scsicmd[8]); 3444 #endif 3445 } 3446 3447 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3448 struct ata_device *dev) 3449 { 3450 u8 scsi_op = scmd->cmnd[0]; 3451 ata_xlat_func_t xlat_func; 3452 int rc = 0; 3453 3454 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 3455 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3456 goto bad_cdb_len; 3457 3458 xlat_func = ata_get_xlat_func(dev, scsi_op); 3459 } else { 3460 if (unlikely(!scmd->cmd_len)) 3461 goto bad_cdb_len; 3462 3463 xlat_func = NULL; 3464 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3465 /* relay SCSI command to ATAPI device */ 3466 int len = COMMAND_SIZE(scsi_op); 3467 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3468 goto bad_cdb_len; 3469 3470 xlat_func = atapi_xlat; 3471 } else { 3472 /* ATA_16 passthru, treat as an ATA command */ 3473 if (unlikely(scmd->cmd_len > 16)) 3474 goto bad_cdb_len; 3475 3476 xlat_func = ata_get_xlat_func(dev, scsi_op); 3477 } 3478 } 3479 3480 if (xlat_func) 3481 rc = ata_scsi_translate(dev, scmd, xlat_func); 3482 else 3483 ata_scsi_simulate(dev, scmd); 3484 3485 return rc; 3486 3487 bad_cdb_len: 3488 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3489 scmd->cmd_len, scsi_op, dev->cdb_len); 3490 scmd->result = DID_ERROR << 16; 3491 scmd->scsi_done(scmd); 3492 return 0; 3493 } 3494 3495 /** 3496 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3497 * @shost: SCSI host of command to be sent 3498 * @cmd: SCSI command to be sent 3499 * 3500 * In some cases, this function translates SCSI commands into 3501 * ATA taskfiles, and queues the taskfiles to be sent to 3502 * hardware. In other cases, this function simulates a 3503 * SCSI device by evaluating and responding to certain 3504 * SCSI commands. This creates the overall effect of 3505 * ATA and ATAPI devices appearing as SCSI devices. 3506 * 3507 * LOCKING: 3508 * ATA host lock 3509 * 3510 * RETURNS: 3511 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3512 * 0 otherwise. 3513 */ 3514 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3515 { 3516 struct ata_port *ap; 3517 struct ata_device *dev; 3518 struct scsi_device *scsidev = cmd->device; 3519 int rc = 0; 3520 unsigned long irq_flags; 3521 3522 ap = ata_shost_to_port(shost); 3523 3524 spin_lock_irqsave(ap->lock, irq_flags); 3525 3526 ata_scsi_dump_cdb(ap, cmd); 3527 3528 dev = ata_scsi_find_dev(ap, scsidev); 3529 if (likely(dev)) 3530 rc = __ata_scsi_queuecmd(cmd, dev); 3531 else { 3532 cmd->result = (DID_BAD_TARGET << 16); 3533 cmd->scsi_done(cmd); 3534 } 3535 3536 spin_unlock_irqrestore(ap->lock, irq_flags); 3537 3538 return rc; 3539 } 3540 3541 /** 3542 * ata_scsi_simulate - simulate SCSI command on ATA device 3543 * @dev: the target device 3544 * @cmd: SCSI command being sent to device. 3545 * 3546 * Interprets and directly executes a select list of SCSI commands 3547 * that can be handled internally. 3548 * 3549 * LOCKING: 3550 * spin_lock_irqsave(host lock) 3551 */ 3552 3553 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3554 { 3555 struct ata_scsi_args args; 3556 const u8 *scsicmd = cmd->cmnd; 3557 u8 tmp8; 3558 3559 args.dev = dev; 3560 args.id = dev->id; 3561 args.cmd = cmd; 3562 args.done = cmd->scsi_done; 3563 3564 switch(scsicmd[0]) { 3565 /* TODO: worth improving? */ 3566 case FORMAT_UNIT: 3567 ata_scsi_invalid_field(cmd); 3568 break; 3569 3570 case INQUIRY: 3571 if (scsicmd[1] & 2) /* is CmdDt set? */ 3572 ata_scsi_invalid_field(cmd); 3573 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3574 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3575 else switch (scsicmd[2]) { 3576 case 0x00: 3577 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3578 break; 3579 case 0x80: 3580 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3581 break; 3582 case 0x83: 3583 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3584 break; 3585 case 0x89: 3586 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3587 break; 3588 case 0xb0: 3589 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3590 break; 3591 case 0xb1: 3592 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3593 break; 3594 case 0xb2: 3595 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3596 break; 3597 default: 3598 ata_scsi_invalid_field(cmd); 3599 break; 3600 } 3601 break; 3602 3603 case MODE_SENSE: 3604 case MODE_SENSE_10: 3605 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3606 break; 3607 3608 case READ_CAPACITY: 3609 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3610 break; 3611 3612 case SERVICE_ACTION_IN_16: 3613 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3614 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3615 else 3616 ata_scsi_invalid_field(cmd); 3617 break; 3618 3619 case REPORT_LUNS: 3620 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3621 break; 3622 3623 case REQUEST_SENSE: 3624 ata_scsi_set_sense(cmd, 0, 0, 0); 3625 cmd->result = (DRIVER_SENSE << 24); 3626 cmd->scsi_done(cmd); 3627 break; 3628 3629 /* if we reach this, then writeback caching is disabled, 3630 * turning this into a no-op. 3631 */ 3632 case SYNCHRONIZE_CACHE: 3633 /* fall through */ 3634 3635 /* no-op's, complete with success */ 3636 case REZERO_UNIT: 3637 case SEEK_6: 3638 case SEEK_10: 3639 case TEST_UNIT_READY: 3640 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3641 break; 3642 3643 case SEND_DIAGNOSTIC: 3644 tmp8 = scsicmd[1] & ~(1 << 3); 3645 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3646 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3647 else 3648 ata_scsi_invalid_field(cmd); 3649 break; 3650 3651 /* all other commands */ 3652 default: 3653 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3654 /* "Invalid command operation code" */ 3655 cmd->scsi_done(cmd); 3656 break; 3657 } 3658 } 3659 3660 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3661 { 3662 int i, rc; 3663 3664 for (i = 0; i < host->n_ports; i++) { 3665 struct ata_port *ap = host->ports[i]; 3666 struct Scsi_Host *shost; 3667 3668 rc = -ENOMEM; 3669 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3670 if (!shost) 3671 goto err_alloc; 3672 3673 shost->eh_noresume = 1; 3674 *(struct ata_port **)&shost->hostdata[0] = ap; 3675 ap->scsi_host = shost; 3676 3677 shost->transportt = ata_scsi_transport_template; 3678 shost->unique_id = ap->print_id; 3679 shost->max_id = 16; 3680 shost->max_lun = 1; 3681 shost->max_channel = 1; 3682 shost->max_cmd_len = 16; 3683 shost->no_write_same = 1; 3684 3685 /* Schedule policy is determined by ->qc_defer() 3686 * callback and it needs to see every deferred qc. 3687 * Set host_blocked to 1 to prevent SCSI midlayer from 3688 * automatically deferring requests. 3689 */ 3690 shost->max_host_blocked = 1; 3691 3692 if (scsi_init_shared_tag_map(shost, host->n_tags)) 3693 goto err_add; 3694 3695 rc = scsi_add_host_with_dma(ap->scsi_host, 3696 &ap->tdev, ap->host->dev); 3697 if (rc) 3698 goto err_add; 3699 } 3700 3701 return 0; 3702 3703 err_add: 3704 scsi_host_put(host->ports[i]->scsi_host); 3705 err_alloc: 3706 while (--i >= 0) { 3707 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3708 3709 scsi_remove_host(shost); 3710 scsi_host_put(shost); 3711 } 3712 return rc; 3713 } 3714 3715 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3716 { 3717 int tries = 5; 3718 struct ata_device *last_failed_dev = NULL; 3719 struct ata_link *link; 3720 struct ata_device *dev; 3721 3722 repeat: 3723 ata_for_each_link(link, ap, EDGE) { 3724 ata_for_each_dev(dev, link, ENABLED) { 3725 struct scsi_device *sdev; 3726 int channel = 0, id = 0; 3727 3728 if (dev->sdev) 3729 continue; 3730 3731 if (ata_is_host_link(link)) 3732 id = dev->devno; 3733 else 3734 channel = link->pmp; 3735 3736 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3737 NULL); 3738 if (!IS_ERR(sdev)) { 3739 dev->sdev = sdev; 3740 scsi_device_put(sdev); 3741 } else { 3742 dev->sdev = NULL; 3743 } 3744 } 3745 } 3746 3747 /* If we scanned while EH was in progress or allocation 3748 * failure occurred, scan would have failed silently. Check 3749 * whether all devices are attached. 3750 */ 3751 ata_for_each_link(link, ap, EDGE) { 3752 ata_for_each_dev(dev, link, ENABLED) { 3753 if (!dev->sdev) 3754 goto exit_loop; 3755 } 3756 } 3757 exit_loop: 3758 if (!link) 3759 return; 3760 3761 /* we're missing some SCSI devices */ 3762 if (sync) { 3763 /* If caller requested synchrnous scan && we've made 3764 * any progress, sleep briefly and repeat. 3765 */ 3766 if (dev != last_failed_dev) { 3767 msleep(100); 3768 last_failed_dev = dev; 3769 goto repeat; 3770 } 3771 3772 /* We might be failing to detect boot device, give it 3773 * a few more chances. 3774 */ 3775 if (--tries) { 3776 msleep(100); 3777 goto repeat; 3778 } 3779 3780 ata_port_err(ap, 3781 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3782 } 3783 3784 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3785 round_jiffies_relative(HZ)); 3786 } 3787 3788 /** 3789 * ata_scsi_offline_dev - offline attached SCSI device 3790 * @dev: ATA device to offline attached SCSI device for 3791 * 3792 * This function is called from ata_eh_hotplug() and responsible 3793 * for taking the SCSI device attached to @dev offline. This 3794 * function is called with host lock which protects dev->sdev 3795 * against clearing. 3796 * 3797 * LOCKING: 3798 * spin_lock_irqsave(host lock) 3799 * 3800 * RETURNS: 3801 * 1 if attached SCSI device exists, 0 otherwise. 3802 */ 3803 int ata_scsi_offline_dev(struct ata_device *dev) 3804 { 3805 if (dev->sdev) { 3806 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3807 return 1; 3808 } 3809 return 0; 3810 } 3811 3812 /** 3813 * ata_scsi_remove_dev - remove attached SCSI device 3814 * @dev: ATA device to remove attached SCSI device for 3815 * 3816 * This function is called from ata_eh_scsi_hotplug() and 3817 * responsible for removing the SCSI device attached to @dev. 3818 * 3819 * LOCKING: 3820 * Kernel thread context (may sleep). 3821 */ 3822 static void ata_scsi_remove_dev(struct ata_device *dev) 3823 { 3824 struct ata_port *ap = dev->link->ap; 3825 struct scsi_device *sdev; 3826 unsigned long flags; 3827 3828 /* Alas, we need to grab scan_mutex to ensure SCSI device 3829 * state doesn't change underneath us and thus 3830 * scsi_device_get() always succeeds. The mutex locking can 3831 * be removed if there is __scsi_device_get() interface which 3832 * increments reference counts regardless of device state. 3833 */ 3834 mutex_lock(&ap->scsi_host->scan_mutex); 3835 spin_lock_irqsave(ap->lock, flags); 3836 3837 /* clearing dev->sdev is protected by host lock */ 3838 sdev = dev->sdev; 3839 dev->sdev = NULL; 3840 3841 if (sdev) { 3842 /* If user initiated unplug races with us, sdev can go 3843 * away underneath us after the host lock and 3844 * scan_mutex are released. Hold onto it. 3845 */ 3846 if (scsi_device_get(sdev) == 0) { 3847 /* The following ensures the attached sdev is 3848 * offline on return from ata_scsi_offline_dev() 3849 * regardless it wins or loses the race 3850 * against this function. 3851 */ 3852 scsi_device_set_state(sdev, SDEV_OFFLINE); 3853 } else { 3854 WARN_ON(1); 3855 sdev = NULL; 3856 } 3857 } 3858 3859 spin_unlock_irqrestore(ap->lock, flags); 3860 mutex_unlock(&ap->scsi_host->scan_mutex); 3861 3862 if (sdev) { 3863 ata_dev_info(dev, "detaching (SCSI %s)\n", 3864 dev_name(&sdev->sdev_gendev)); 3865 3866 scsi_remove_device(sdev); 3867 scsi_device_put(sdev); 3868 } 3869 } 3870 3871 static void ata_scsi_handle_link_detach(struct ata_link *link) 3872 { 3873 struct ata_port *ap = link->ap; 3874 struct ata_device *dev; 3875 3876 ata_for_each_dev(dev, link, ALL) { 3877 unsigned long flags; 3878 3879 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3880 continue; 3881 3882 spin_lock_irqsave(ap->lock, flags); 3883 dev->flags &= ~ATA_DFLAG_DETACHED; 3884 spin_unlock_irqrestore(ap->lock, flags); 3885 3886 if (zpodd_dev_enabled(dev)) 3887 zpodd_exit(dev); 3888 3889 ata_scsi_remove_dev(dev); 3890 } 3891 } 3892 3893 /** 3894 * ata_scsi_media_change_notify - send media change event 3895 * @dev: Pointer to the disk device with media change event 3896 * 3897 * Tell the block layer to send a media change notification 3898 * event. 3899 * 3900 * LOCKING: 3901 * spin_lock_irqsave(host lock) 3902 */ 3903 void ata_scsi_media_change_notify(struct ata_device *dev) 3904 { 3905 if (dev->sdev) 3906 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3907 GFP_ATOMIC); 3908 } 3909 3910 /** 3911 * ata_scsi_hotplug - SCSI part of hotplug 3912 * @work: Pointer to ATA port to perform SCSI hotplug on 3913 * 3914 * Perform SCSI part of hotplug. It's executed from a separate 3915 * workqueue after EH completes. This is necessary because SCSI 3916 * hot plugging requires working EH and hot unplugging is 3917 * synchronized with hot plugging with a mutex. 3918 * 3919 * LOCKING: 3920 * Kernel thread context (may sleep). 3921 */ 3922 void ata_scsi_hotplug(struct work_struct *work) 3923 { 3924 struct ata_port *ap = 3925 container_of(work, struct ata_port, hotplug_task.work); 3926 int i; 3927 3928 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3929 DPRINTK("ENTER/EXIT - unloading\n"); 3930 return; 3931 } 3932 3933 /* 3934 * XXX - UGLY HACK 3935 * 3936 * The block layer suspend/resume path is fundamentally broken due 3937 * to freezable kthreads and workqueue and may deadlock if a block 3938 * device gets removed while resume is in progress. I don't know 3939 * what the solution is short of removing freezable kthreads and 3940 * workqueues altogether. 3941 * 3942 * The following is an ugly hack to avoid kicking off device 3943 * removal while freezer is active. This is a joke but does avoid 3944 * this particular deadlock scenario. 3945 * 3946 * https://bugzilla.kernel.org/show_bug.cgi?id=62801 3947 * http://marc.info/?l=linux-kernel&m=138695698516487 3948 */ 3949 #ifdef CONFIG_FREEZER 3950 while (pm_freezing) 3951 msleep(10); 3952 #endif 3953 3954 DPRINTK("ENTER\n"); 3955 mutex_lock(&ap->scsi_scan_mutex); 3956 3957 /* Unplug detached devices. We cannot use link iterator here 3958 * because PMP links have to be scanned even if PMP is 3959 * currently not attached. Iterate manually. 3960 */ 3961 ata_scsi_handle_link_detach(&ap->link); 3962 if (ap->pmp_link) 3963 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3964 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3965 3966 /* scan for new ones */ 3967 ata_scsi_scan_host(ap, 0); 3968 3969 mutex_unlock(&ap->scsi_scan_mutex); 3970 DPRINTK("EXIT\n"); 3971 } 3972 3973 /** 3974 * ata_scsi_user_scan - indication for user-initiated bus scan 3975 * @shost: SCSI host to scan 3976 * @channel: Channel to scan 3977 * @id: ID to scan 3978 * @lun: LUN to scan 3979 * 3980 * This function is called when user explicitly requests bus 3981 * scan. Set probe pending flag and invoke EH. 3982 * 3983 * LOCKING: 3984 * SCSI layer (we don't care) 3985 * 3986 * RETURNS: 3987 * Zero. 3988 */ 3989 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3990 unsigned int id, u64 lun) 3991 { 3992 struct ata_port *ap = ata_shost_to_port(shost); 3993 unsigned long flags; 3994 int devno, rc = 0; 3995 3996 if (!ap->ops->error_handler) 3997 return -EOPNOTSUPP; 3998 3999 if (lun != SCAN_WILD_CARD && lun) 4000 return -EINVAL; 4001 4002 if (!sata_pmp_attached(ap)) { 4003 if (channel != SCAN_WILD_CARD && channel) 4004 return -EINVAL; 4005 devno = id; 4006 } else { 4007 if (id != SCAN_WILD_CARD && id) 4008 return -EINVAL; 4009 devno = channel; 4010 } 4011 4012 spin_lock_irqsave(ap->lock, flags); 4013 4014 if (devno == SCAN_WILD_CARD) { 4015 struct ata_link *link; 4016 4017 ata_for_each_link(link, ap, EDGE) { 4018 struct ata_eh_info *ehi = &link->eh_info; 4019 ehi->probe_mask |= ATA_ALL_DEVICES; 4020 ehi->action |= ATA_EH_RESET; 4021 } 4022 } else { 4023 struct ata_device *dev = ata_find_dev(ap, devno); 4024 4025 if (dev) { 4026 struct ata_eh_info *ehi = &dev->link->eh_info; 4027 ehi->probe_mask |= 1 << dev->devno; 4028 ehi->action |= ATA_EH_RESET; 4029 } else 4030 rc = -EINVAL; 4031 } 4032 4033 if (rc == 0) { 4034 ata_port_schedule_eh(ap); 4035 spin_unlock_irqrestore(ap->lock, flags); 4036 ata_port_wait_eh(ap); 4037 } else 4038 spin_unlock_irqrestore(ap->lock, flags); 4039 4040 return rc; 4041 } 4042 4043 /** 4044 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4045 * @work: Pointer to ATA port to perform scsi_rescan_device() 4046 * 4047 * After ATA pass thru (SAT) commands are executed successfully, 4048 * libata need to propagate the changes to SCSI layer. 4049 * 4050 * LOCKING: 4051 * Kernel thread context (may sleep). 4052 */ 4053 void ata_scsi_dev_rescan(struct work_struct *work) 4054 { 4055 struct ata_port *ap = 4056 container_of(work, struct ata_port, scsi_rescan_task); 4057 struct ata_link *link; 4058 struct ata_device *dev; 4059 unsigned long flags; 4060 4061 mutex_lock(&ap->scsi_scan_mutex); 4062 spin_lock_irqsave(ap->lock, flags); 4063 4064 ata_for_each_link(link, ap, EDGE) { 4065 ata_for_each_dev(dev, link, ENABLED) { 4066 struct scsi_device *sdev = dev->sdev; 4067 4068 if (!sdev) 4069 continue; 4070 if (scsi_device_get(sdev)) 4071 continue; 4072 4073 spin_unlock_irqrestore(ap->lock, flags); 4074 scsi_rescan_device(&(sdev->sdev_gendev)); 4075 scsi_device_put(sdev); 4076 spin_lock_irqsave(ap->lock, flags); 4077 } 4078 } 4079 4080 spin_unlock_irqrestore(ap->lock, flags); 4081 mutex_unlock(&ap->scsi_scan_mutex); 4082 } 4083 4084 /** 4085 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4086 * @host: ATA host container for all SAS ports 4087 * @port_info: Information from low-level host driver 4088 * @shost: SCSI host that the scsi device is attached to 4089 * 4090 * LOCKING: 4091 * PCI/etc. bus probe sem. 4092 * 4093 * RETURNS: 4094 * ata_port pointer on success / NULL on failure. 4095 */ 4096 4097 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4098 struct ata_port_info *port_info, 4099 struct Scsi_Host *shost) 4100 { 4101 struct ata_port *ap; 4102 4103 ap = ata_port_alloc(host); 4104 if (!ap) 4105 return NULL; 4106 4107 ap->port_no = 0; 4108 ap->lock = &host->lock; 4109 ap->pio_mask = port_info->pio_mask; 4110 ap->mwdma_mask = port_info->mwdma_mask; 4111 ap->udma_mask = port_info->udma_mask; 4112 ap->flags |= port_info->flags; 4113 ap->ops = port_info->port_ops; 4114 ap->cbl = ATA_CBL_SATA; 4115 4116 return ap; 4117 } 4118 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4119 4120 /** 4121 * ata_sas_port_start - Set port up for dma. 4122 * @ap: Port to initialize 4123 * 4124 * Called just after data structures for each port are 4125 * initialized. 4126 * 4127 * May be used as the port_start() entry in ata_port_operations. 4128 * 4129 * LOCKING: 4130 * Inherited from caller. 4131 */ 4132 int ata_sas_port_start(struct ata_port *ap) 4133 { 4134 /* 4135 * the port is marked as frozen at allocation time, but if we don't 4136 * have new eh, we won't thaw it 4137 */ 4138 if (!ap->ops->error_handler) 4139 ap->pflags &= ~ATA_PFLAG_FROZEN; 4140 return 0; 4141 } 4142 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4143 4144 /** 4145 * ata_port_stop - Undo ata_sas_port_start() 4146 * @ap: Port to shut down 4147 * 4148 * May be used as the port_stop() entry in ata_port_operations. 4149 * 4150 * LOCKING: 4151 * Inherited from caller. 4152 */ 4153 4154 void ata_sas_port_stop(struct ata_port *ap) 4155 { 4156 } 4157 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4158 4159 /** 4160 * ata_sas_async_probe - simply schedule probing and return 4161 * @ap: Port to probe 4162 * 4163 * For batch scheduling of probe for sas attached ata devices, assumes 4164 * the port has already been through ata_sas_port_init() 4165 */ 4166 void ata_sas_async_probe(struct ata_port *ap) 4167 { 4168 __ata_port_probe(ap); 4169 } 4170 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4171 4172 int ata_sas_sync_probe(struct ata_port *ap) 4173 { 4174 return ata_port_probe(ap); 4175 } 4176 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4177 4178 4179 /** 4180 * ata_sas_port_init - Initialize a SATA device 4181 * @ap: SATA port to initialize 4182 * 4183 * LOCKING: 4184 * PCI/etc. bus probe sem. 4185 * 4186 * RETURNS: 4187 * Zero on success, non-zero on error. 4188 */ 4189 4190 int ata_sas_port_init(struct ata_port *ap) 4191 { 4192 int rc = ap->ops->port_start(ap); 4193 4194 if (rc) 4195 return rc; 4196 ap->print_id = atomic_inc_return(&ata_print_id); 4197 return 0; 4198 } 4199 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4200 4201 /** 4202 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4203 * @ap: SATA port to destroy 4204 * 4205 */ 4206 4207 void ata_sas_port_destroy(struct ata_port *ap) 4208 { 4209 if (ap->ops->port_stop) 4210 ap->ops->port_stop(ap); 4211 kfree(ap); 4212 } 4213 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4214 4215 /** 4216 * ata_sas_slave_configure - Default slave_config routine for libata devices 4217 * @sdev: SCSI device to configure 4218 * @ap: ATA port to which SCSI device is attached 4219 * 4220 * RETURNS: 4221 * Zero. 4222 */ 4223 4224 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4225 { 4226 ata_scsi_sdev_config(sdev); 4227 ata_scsi_dev_config(sdev, ap->link.device); 4228 return 0; 4229 } 4230 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4231 4232 /** 4233 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4234 * @cmd: SCSI command to be sent 4235 * @ap: ATA port to which the command is being sent 4236 * 4237 * RETURNS: 4238 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4239 * 0 otherwise. 4240 */ 4241 4242 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4243 { 4244 int rc = 0; 4245 4246 ata_scsi_dump_cdb(ap, cmd); 4247 4248 if (likely(ata_dev_enabled(ap->link.device))) 4249 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4250 else { 4251 cmd->result = (DID_BAD_TARGET << 16); 4252 cmd->scsi_done(cmd); 4253 } 4254 return rc; 4255 } 4256 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4257 4258 int ata_sas_allocate_tag(struct ata_port *ap) 4259 { 4260 unsigned int max_queue = ap->host->n_tags; 4261 unsigned int i, tag; 4262 4263 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { 4264 tag = tag < max_queue ? tag : 0; 4265 4266 /* the last tag is reserved for internal command. */ 4267 if (tag == ATA_TAG_INTERNAL) 4268 continue; 4269 4270 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { 4271 ap->sas_last_tag = tag; 4272 return tag; 4273 } 4274 } 4275 return -1; 4276 } 4277 4278 void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) 4279 { 4280 clear_bit(tag, &ap->sas_tag_allocated); 4281 } 4282