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