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 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 274 { 275 if (!cmd) 276 return; 277 278 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 279 280 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 281 } 282 283 void ata_scsi_set_sense_information(struct scsi_cmnd *cmd, 284 const struct ata_taskfile *tf) 285 { 286 u64 information; 287 288 if (!cmd) 289 return; 290 291 information = ata_tf_read_block(tf, NULL); 292 scsi_set_sense_information(cmd->sense_buffer, information); 293 } 294 295 static ssize_t 296 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 297 const char *buf, size_t count) 298 { 299 struct Scsi_Host *shost = class_to_shost(dev); 300 struct ata_port *ap = ata_shost_to_port(shost); 301 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 302 return ap->ops->em_store(ap, buf, count); 303 return -EINVAL; 304 } 305 306 static ssize_t 307 ata_scsi_em_message_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 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 314 return ap->ops->em_show(ap, buf); 315 return -EINVAL; 316 } 317 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 318 ata_scsi_em_message_show, ata_scsi_em_message_store); 319 EXPORT_SYMBOL_GPL(dev_attr_em_message); 320 321 static ssize_t 322 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 323 char *buf) 324 { 325 struct Scsi_Host *shost = class_to_shost(dev); 326 struct ata_port *ap = ata_shost_to_port(shost); 327 328 return snprintf(buf, 23, "%d\n", ap->em_message_type); 329 } 330 DEVICE_ATTR(em_message_type, S_IRUGO, 331 ata_scsi_em_message_type_show, NULL); 332 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 333 334 static ssize_t 335 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 336 char *buf) 337 { 338 struct scsi_device *sdev = to_scsi_device(dev); 339 struct ata_port *ap = ata_shost_to_port(sdev->host); 340 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 341 342 if (atadev && ap->ops->sw_activity_show && 343 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 344 return ap->ops->sw_activity_show(atadev, buf); 345 return -EINVAL; 346 } 347 348 static ssize_t 349 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 350 const char *buf, size_t count) 351 { 352 struct scsi_device *sdev = to_scsi_device(dev); 353 struct ata_port *ap = ata_shost_to_port(sdev->host); 354 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 355 enum sw_activity val; 356 int rc; 357 358 if (atadev && ap->ops->sw_activity_store && 359 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 360 val = simple_strtoul(buf, NULL, 0); 361 switch (val) { 362 case OFF: case BLINK_ON: case BLINK_OFF: 363 rc = ap->ops->sw_activity_store(atadev, val); 364 if (!rc) 365 return count; 366 else 367 return rc; 368 } 369 } 370 return -EINVAL; 371 } 372 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 373 ata_scsi_activity_store); 374 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 375 376 struct device_attribute *ata_common_sdev_attrs[] = { 377 &dev_attr_unload_heads, 378 NULL 379 }; 380 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 381 382 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 383 { 384 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 385 /* "Invalid field in cbd" */ 386 cmd->scsi_done(cmd); 387 } 388 389 /** 390 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 391 * @sdev: SCSI device for which BIOS geometry is to be determined 392 * @bdev: block device associated with @sdev 393 * @capacity: capacity of SCSI device 394 * @geom: location to which geometry will be output 395 * 396 * Generic bios head/sector/cylinder calculator 397 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 398 * mapping. Some situations may arise where the disk is not 399 * bootable if this is not used. 400 * 401 * LOCKING: 402 * Defined by the SCSI layer. We don't really care. 403 * 404 * RETURNS: 405 * Zero. 406 */ 407 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 408 sector_t capacity, int geom[]) 409 { 410 geom[0] = 255; 411 geom[1] = 63; 412 sector_div(capacity, 255*63); 413 geom[2] = capacity; 414 415 return 0; 416 } 417 418 /** 419 * ata_scsi_unlock_native_capacity - unlock native capacity 420 * @sdev: SCSI device to adjust device capacity for 421 * 422 * This function is called if a partition on @sdev extends beyond 423 * the end of the device. It requests EH to unlock HPA. 424 * 425 * LOCKING: 426 * Defined by the SCSI layer. Might sleep. 427 */ 428 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 429 { 430 struct ata_port *ap = ata_shost_to_port(sdev->host); 431 struct ata_device *dev; 432 unsigned long flags; 433 434 spin_lock_irqsave(ap->lock, flags); 435 436 dev = ata_scsi_find_dev(ap, sdev); 437 if (dev && dev->n_sectors < dev->n_native_sectors) { 438 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 439 dev->link->eh_info.action |= ATA_EH_RESET; 440 ata_port_schedule_eh(ap); 441 } 442 443 spin_unlock_irqrestore(ap->lock, flags); 444 ata_port_wait_eh(ap); 445 } 446 447 /** 448 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 449 * @ap: target port 450 * @sdev: SCSI device to get identify data for 451 * @arg: User buffer area for identify data 452 * 453 * LOCKING: 454 * Defined by the SCSI layer. We don't really care. 455 * 456 * RETURNS: 457 * Zero on success, negative errno on error. 458 */ 459 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 460 void __user *arg) 461 { 462 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 463 u16 __user *dst = arg; 464 char buf[40]; 465 466 if (!dev) 467 return -ENOMSG; 468 469 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 470 return -EFAULT; 471 472 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 473 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 474 return -EFAULT; 475 476 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 477 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 478 return -EFAULT; 479 480 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 481 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 482 return -EFAULT; 483 484 return 0; 485 } 486 487 /** 488 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 489 * @scsidev: Device to which we are issuing command 490 * @arg: User provided data for issuing command 491 * 492 * LOCKING: 493 * Defined by the SCSI layer. We don't really care. 494 * 495 * RETURNS: 496 * Zero on success, negative errno on error. 497 */ 498 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 499 { 500 int rc = 0; 501 u8 scsi_cmd[MAX_COMMAND_SIZE]; 502 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 503 int argsize = 0; 504 enum dma_data_direction data_dir; 505 int cmd_result; 506 507 if (arg == NULL) 508 return -EINVAL; 509 510 if (copy_from_user(args, arg, sizeof(args))) 511 return -EFAULT; 512 513 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 514 if (!sensebuf) 515 return -ENOMEM; 516 517 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 518 519 if (args[3]) { 520 argsize = ATA_SECT_SIZE * args[3]; 521 argbuf = kmalloc(argsize, GFP_KERNEL); 522 if (argbuf == NULL) { 523 rc = -ENOMEM; 524 goto error; 525 } 526 527 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 528 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 529 block count in sector count field */ 530 data_dir = DMA_FROM_DEVICE; 531 } else { 532 scsi_cmd[1] = (3 << 1); /* Non-data */ 533 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 534 data_dir = DMA_NONE; 535 } 536 537 scsi_cmd[0] = ATA_16; 538 539 scsi_cmd[4] = args[2]; 540 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 541 scsi_cmd[6] = args[3]; 542 scsi_cmd[8] = args[1]; 543 scsi_cmd[10] = 0x4f; 544 scsi_cmd[12] = 0xc2; 545 } else { 546 scsi_cmd[6] = args[1]; 547 } 548 scsi_cmd[14] = args[0]; 549 550 /* Good values for timeout and retries? Values below 551 from scsi_ioctl_send_command() for default case... */ 552 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 553 sensebuf, (10*HZ), 5, 0, NULL); 554 555 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 556 u8 *desc = sensebuf + 8; 557 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 558 559 /* If we set cc then ATA pass-through will cause a 560 * check condition even if no error. Filter that. */ 561 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 562 struct scsi_sense_hdr sshdr; 563 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 564 &sshdr); 565 if (sshdr.sense_key == RECOVERED_ERROR && 566 sshdr.asc == 0 && sshdr.ascq == 0x1d) 567 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 568 } 569 570 /* Send userspace a few ATA registers (same as drivers/ide) */ 571 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 572 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 573 args[0] = desc[13]; /* status */ 574 args[1] = desc[3]; /* error */ 575 args[2] = desc[5]; /* sector count (0:7) */ 576 if (copy_to_user(arg, args, sizeof(args))) 577 rc = -EFAULT; 578 } 579 } 580 581 582 if (cmd_result) { 583 rc = -EIO; 584 goto error; 585 } 586 587 if ((argbuf) 588 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 589 rc = -EFAULT; 590 error: 591 kfree(sensebuf); 592 kfree(argbuf); 593 return rc; 594 } 595 596 /** 597 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 598 * @scsidev: Device to which we are issuing command 599 * @arg: User provided data for issuing command 600 * 601 * LOCKING: 602 * Defined by the SCSI layer. We don't really care. 603 * 604 * RETURNS: 605 * Zero on success, negative errno on error. 606 */ 607 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 608 { 609 int rc = 0; 610 u8 scsi_cmd[MAX_COMMAND_SIZE]; 611 u8 args[7], *sensebuf = NULL; 612 int cmd_result; 613 614 if (arg == NULL) 615 return -EINVAL; 616 617 if (copy_from_user(args, arg, sizeof(args))) 618 return -EFAULT; 619 620 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 621 if (!sensebuf) 622 return -ENOMEM; 623 624 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 625 scsi_cmd[0] = ATA_16; 626 scsi_cmd[1] = (3 << 1); /* Non-data */ 627 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 628 scsi_cmd[4] = args[1]; 629 scsi_cmd[6] = args[2]; 630 scsi_cmd[8] = args[3]; 631 scsi_cmd[10] = args[4]; 632 scsi_cmd[12] = args[5]; 633 scsi_cmd[13] = args[6] & 0x4f; 634 scsi_cmd[14] = args[0]; 635 636 /* Good values for timeout and retries? Values below 637 from scsi_ioctl_send_command() for default case... */ 638 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 639 sensebuf, (10*HZ), 5, 0, NULL); 640 641 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 642 u8 *desc = sensebuf + 8; 643 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 644 645 /* If we set cc then ATA pass-through will cause a 646 * check condition even if no error. Filter that. */ 647 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 648 struct scsi_sense_hdr sshdr; 649 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 650 &sshdr); 651 if (sshdr.sense_key == RECOVERED_ERROR && 652 sshdr.asc == 0 && sshdr.ascq == 0x1d) 653 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 654 } 655 656 /* Send userspace ATA registers */ 657 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 658 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 659 args[0] = desc[13]; /* status */ 660 args[1] = desc[3]; /* error */ 661 args[2] = desc[5]; /* sector count (0:7) */ 662 args[3] = desc[7]; /* lbal */ 663 args[4] = desc[9]; /* lbam */ 664 args[5] = desc[11]; /* lbah */ 665 args[6] = desc[12]; /* select */ 666 if (copy_to_user(arg, args, sizeof(args))) 667 rc = -EFAULT; 668 } 669 } 670 671 if (cmd_result) { 672 rc = -EIO; 673 goto error; 674 } 675 676 error: 677 kfree(sensebuf); 678 return rc; 679 } 680 681 static int ata_ioc32(struct ata_port *ap) 682 { 683 if (ap->flags & ATA_FLAG_PIO_DMA) 684 return 1; 685 if (ap->pflags & ATA_PFLAG_PIO32) 686 return 1; 687 return 0; 688 } 689 690 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 691 int cmd, void __user *arg) 692 { 693 int val = -EINVAL, rc = -EINVAL; 694 unsigned long flags; 695 696 switch (cmd) { 697 case ATA_IOC_GET_IO32: 698 spin_lock_irqsave(ap->lock, flags); 699 val = ata_ioc32(ap); 700 spin_unlock_irqrestore(ap->lock, flags); 701 if (copy_to_user(arg, &val, 1)) 702 return -EFAULT; 703 return 0; 704 705 case ATA_IOC_SET_IO32: 706 val = (unsigned long) arg; 707 rc = 0; 708 spin_lock_irqsave(ap->lock, flags); 709 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 710 if (val) 711 ap->pflags |= ATA_PFLAG_PIO32; 712 else 713 ap->pflags &= ~ATA_PFLAG_PIO32; 714 } else { 715 if (val != ata_ioc32(ap)) 716 rc = -EINVAL; 717 } 718 spin_unlock_irqrestore(ap->lock, flags); 719 return rc; 720 721 case HDIO_GET_IDENTITY: 722 return ata_get_identity(ap, scsidev, arg); 723 724 case HDIO_DRIVE_CMD: 725 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 726 return -EACCES; 727 return ata_cmd_ioctl(scsidev, arg); 728 729 case HDIO_DRIVE_TASK: 730 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 731 return -EACCES; 732 return ata_task_ioctl(scsidev, arg); 733 734 default: 735 rc = -ENOTTY; 736 break; 737 } 738 739 return rc; 740 } 741 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 742 743 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 744 { 745 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 746 scsidev, cmd, arg); 747 } 748 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 749 750 /** 751 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 752 * @dev: ATA device to which the new command is attached 753 * @cmd: SCSI command that originated this ATA command 754 * 755 * Obtain a reference to an unused ata_queued_cmd structure, 756 * which is the basic libata structure representing a single 757 * ATA command sent to the hardware. 758 * 759 * If a command was available, fill in the SCSI-specific 760 * portions of the structure with information on the 761 * current command. 762 * 763 * LOCKING: 764 * spin_lock_irqsave(host lock) 765 * 766 * RETURNS: 767 * Command allocated, or %NULL if none available. 768 */ 769 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 770 struct scsi_cmnd *cmd) 771 { 772 struct ata_queued_cmd *qc; 773 774 qc = ata_qc_new_init(dev, cmd->request->tag); 775 if (qc) { 776 qc->scsicmd = cmd; 777 qc->scsidone = cmd->scsi_done; 778 779 qc->sg = scsi_sglist(cmd); 780 qc->n_elem = scsi_sg_count(cmd); 781 } else { 782 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 783 cmd->scsi_done(cmd); 784 } 785 786 return qc; 787 } 788 789 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 790 { 791 struct scsi_cmnd *scmd = qc->scsicmd; 792 793 qc->extrabytes = scmd->request->extra_len; 794 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 795 } 796 797 /** 798 * ata_dump_status - user friendly display of error info 799 * @id: id of the port in question 800 * @tf: ptr to filled out taskfile 801 * 802 * Decode and dump the ATA error/status registers for the user so 803 * that they have some idea what really happened at the non 804 * make-believe layer. 805 * 806 * LOCKING: 807 * inherited from caller 808 */ 809 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 810 { 811 u8 stat = tf->command, err = tf->feature; 812 813 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 814 if (stat & ATA_BUSY) { 815 printk("Busy }\n"); /* Data is not valid in this case */ 816 } else { 817 if (stat & ATA_DRDY) printk("DriveReady "); 818 if (stat & ATA_DF) printk("DeviceFault "); 819 if (stat & ATA_DSC) printk("SeekComplete "); 820 if (stat & ATA_DRQ) printk("DataRequest "); 821 if (stat & ATA_CORR) printk("CorrectedError "); 822 if (stat & ATA_SENSE) printk("Sense "); 823 if (stat & ATA_ERR) printk("Error "); 824 printk("}\n"); 825 826 if (err) { 827 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 828 if (err & ATA_ABORTED) printk("DriveStatusError "); 829 if (err & ATA_ICRC) { 830 if (err & ATA_ABORTED) 831 printk("BadCRC "); 832 else printk("Sector "); 833 } 834 if (err & ATA_UNC) printk("UncorrectableError "); 835 if (err & ATA_IDNF) printk("SectorIdNotFound "); 836 if (err & ATA_TRK0NF) printk("TrackZeroNotFound "); 837 if (err & ATA_AMNF) printk("AddrMarkNotFound "); 838 printk("}\n"); 839 } 840 } 841 } 842 843 /** 844 * ata_to_sense_error - convert ATA error to SCSI error 845 * @id: ATA device number 846 * @drv_stat: value contained in ATA status register 847 * @drv_err: value contained in ATA error register 848 * @sk: the sense key we'll fill out 849 * @asc: the additional sense code we'll fill out 850 * @ascq: the additional sense code qualifier we'll fill out 851 * @verbose: be verbose 852 * 853 * Converts an ATA error into a SCSI error. Fill out pointers to 854 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 855 * format sense blocks. 856 * 857 * LOCKING: 858 * spin_lock_irqsave(host lock) 859 */ 860 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 861 u8 *asc, u8 *ascq, int verbose) 862 { 863 int i; 864 865 /* Based on the 3ware driver translation table */ 866 static const unsigned char sense_table[][4] = { 867 /* BBD|ECC|ID|MAR */ 868 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 869 // Device busy Aborted command 870 /* BBD|ECC|ID */ 871 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 872 // Device busy Aborted command 873 /* ECC|MC|MARK */ 874 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 875 // Device fault Hardware error 876 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 877 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 878 // Data CRC error SCSI parity error 879 /* MC|ID|ABRT|TRK0|MARK */ 880 {0x37, NOT_READY, 0x04, 0x00}, 881 // Unit offline Not ready 882 /* MCR|MARK */ 883 {0x09, NOT_READY, 0x04, 0x00}, 884 // Unrecovered disk error Not ready 885 /* Bad address mark */ 886 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 887 // Address mark not found for data field 888 /* TRK0 - Track 0 not found */ 889 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 890 // Hardware error 891 /* Abort: 0x04 is not translated here, see below */ 892 /* Media change request */ 893 {0x08, NOT_READY, 0x04, 0x00}, 894 // FIXME: faking offline 895 /* SRV/IDNF - ID not found */ 896 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 897 // Logical address out of range 898 /* MC - Media Changed */ 899 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 900 // Not ready to ready change, medium may have changed 901 /* ECC - Uncorrectable ECC error */ 902 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 903 // Unrecovered read error 904 /* BBD - block marked bad */ 905 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 906 // Block marked bad Medium error, unrecovered read error 907 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 908 }; 909 static const unsigned char stat_table[][4] = { 910 /* Must be first because BUSY means no other bits valid */ 911 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 912 // Busy, fake parity for now 913 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 914 // Device ready, unaligned write command 915 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 916 // Device fault, internal target failure 917 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 918 // Timed out in xfer, fake parity for now 919 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 920 // Recovered ECC error Medium error, recovered 921 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 922 }; 923 924 /* 925 * Is this an error we can process/parse 926 */ 927 if (drv_stat & ATA_BUSY) { 928 drv_err = 0; /* Ignore the err bits, they're invalid */ 929 } 930 931 if (drv_err) { 932 /* Look for drv_err */ 933 for (i = 0; sense_table[i][0] != 0xFF; i++) { 934 /* Look for best matches first */ 935 if ((sense_table[i][0] & drv_err) == 936 sense_table[i][0]) { 937 *sk = sense_table[i][1]; 938 *asc = sense_table[i][2]; 939 *ascq = sense_table[i][3]; 940 goto translate_done; 941 } 942 } 943 } 944 945 /* 946 * Fall back to interpreting status bits. Note that if the drv_err 947 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 948 * is not descriptive enough. 949 */ 950 for (i = 0; stat_table[i][0] != 0xFF; i++) { 951 if (stat_table[i][0] & drv_stat) { 952 *sk = stat_table[i][1]; 953 *asc = stat_table[i][2]; 954 *ascq = stat_table[i][3]; 955 goto translate_done; 956 } 957 } 958 959 /* 960 * We need a sensible error return here, which is tricky, and one 961 * that won't cause people to do things like return a disk wrongly. 962 */ 963 *sk = ABORTED_COMMAND; 964 *asc = 0x00; 965 *ascq = 0x00; 966 967 translate_done: 968 if (verbose) 969 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 970 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 971 id, drv_stat, drv_err, *sk, *asc, *ascq); 972 return; 973 } 974 975 /* 976 * ata_gen_passthru_sense - Generate check condition sense block. 977 * @qc: Command that completed. 978 * 979 * This function is specific to the ATA descriptor format sense 980 * block specified for the ATA pass through commands. Regardless 981 * of whether the command errored or not, return a sense 982 * block. Copy all controller registers into the sense 983 * block. If there was no error, we get the request from an ATA 984 * passthrough command, so we use the following sense data: 985 * sk = RECOVERED ERROR 986 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 987 * 988 * 989 * LOCKING: 990 * None. 991 */ 992 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 993 { 994 struct scsi_cmnd *cmd = qc->scsicmd; 995 struct ata_taskfile *tf = &qc->result_tf; 996 unsigned char *sb = cmd->sense_buffer; 997 unsigned char *desc = sb + 8; 998 int verbose = qc->ap->ops->error_handler == NULL; 999 1000 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1001 1002 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1003 1004 /* 1005 * Use ata_to_sense_error() to map status register bits 1006 * onto sense key, asc & ascq. 1007 */ 1008 if (qc->err_mask || 1009 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1010 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1011 &sb[1], &sb[2], &sb[3], verbose); 1012 sb[1] &= 0x0f; 1013 } else { 1014 sb[1] = RECOVERED_ERROR; 1015 sb[2] = 0; 1016 sb[3] = 0x1D; 1017 } 1018 1019 /* 1020 * Sense data is current and format is descriptor. 1021 */ 1022 sb[0] = 0x72; 1023 1024 desc[0] = 0x09; 1025 1026 /* set length of additional sense data */ 1027 sb[7] = 14; 1028 desc[1] = 12; 1029 1030 /* 1031 * Copy registers into sense buffer. 1032 */ 1033 desc[2] = 0x00; 1034 desc[3] = tf->feature; /* == error reg */ 1035 desc[5] = tf->nsect; 1036 desc[7] = tf->lbal; 1037 desc[9] = tf->lbam; 1038 desc[11] = tf->lbah; 1039 desc[12] = tf->device; 1040 desc[13] = tf->command; /* == status reg */ 1041 1042 /* 1043 * Fill in Extend bit, and the high order bytes 1044 * if applicable. 1045 */ 1046 if (tf->flags & ATA_TFLAG_LBA48) { 1047 desc[2] |= 0x01; 1048 desc[4] = tf->hob_nsect; 1049 desc[6] = tf->hob_lbal; 1050 desc[8] = tf->hob_lbam; 1051 desc[10] = tf->hob_lbah; 1052 } 1053 } 1054 1055 /** 1056 * ata_gen_ata_sense - generate a SCSI fixed sense block 1057 * @qc: Command that we are erroring out 1058 * 1059 * Generate sense block for a failed ATA command @qc. Descriptor 1060 * format is used to accommodate LBA48 block address. 1061 * 1062 * LOCKING: 1063 * None. 1064 */ 1065 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1066 { 1067 struct ata_device *dev = qc->dev; 1068 struct scsi_cmnd *cmd = qc->scsicmd; 1069 struct ata_taskfile *tf = &qc->result_tf; 1070 unsigned char *sb = cmd->sense_buffer; 1071 unsigned char *desc = sb + 8; 1072 int verbose = qc->ap->ops->error_handler == NULL; 1073 u64 block; 1074 1075 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1076 1077 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1078 1079 /* sense data is current and format is descriptor */ 1080 sb[0] = 0x72; 1081 1082 /* Use ata_to_sense_error() to map status register bits 1083 * onto sense key, asc & ascq. 1084 */ 1085 if (qc->err_mask || 1086 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1087 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1088 &sb[1], &sb[2], &sb[3], verbose); 1089 sb[1] &= 0x0f; 1090 } 1091 1092 block = ata_tf_read_block(&qc->result_tf, dev); 1093 1094 /* information sense data descriptor */ 1095 sb[7] = 12; 1096 desc[0] = 0x00; 1097 desc[1] = 10; 1098 1099 desc[2] |= 0x80; /* valid */ 1100 desc[6] = block >> 40; 1101 desc[7] = block >> 32; 1102 desc[8] = block >> 24; 1103 desc[9] = block >> 16; 1104 desc[10] = block >> 8; 1105 desc[11] = block; 1106 } 1107 1108 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1109 { 1110 sdev->use_10_for_rw = 1; 1111 sdev->use_10_for_ms = 1; 1112 sdev->no_report_opcodes = 1; 1113 sdev->no_write_same = 1; 1114 1115 /* Schedule policy is determined by ->qc_defer() callback and 1116 * it needs to see every deferred qc. Set dev_blocked to 1 to 1117 * prevent SCSI midlayer from automatically deferring 1118 * requests. 1119 */ 1120 sdev->max_device_blocked = 1; 1121 } 1122 1123 /** 1124 * atapi_drain_needed - Check whether data transfer may overflow 1125 * @rq: request to be checked 1126 * 1127 * ATAPI commands which transfer variable length data to host 1128 * might overflow due to application error or hardare bug. This 1129 * function checks whether overflow should be drained and ignored 1130 * for @request. 1131 * 1132 * LOCKING: 1133 * None. 1134 * 1135 * RETURNS: 1136 * 1 if ; otherwise, 0. 1137 */ 1138 static int atapi_drain_needed(struct request *rq) 1139 { 1140 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1141 return 0; 1142 1143 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1144 return 0; 1145 1146 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1147 } 1148 1149 static int ata_scsi_dev_config(struct scsi_device *sdev, 1150 struct ata_device *dev) 1151 { 1152 struct request_queue *q = sdev->request_queue; 1153 1154 if (!ata_id_has_unload(dev->id)) 1155 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1156 1157 /* configure max sectors */ 1158 blk_queue_max_hw_sectors(q, dev->max_sectors); 1159 1160 if (dev->class == ATA_DEV_ATAPI) { 1161 void *buf; 1162 1163 sdev->sector_size = ATA_SECT_SIZE; 1164 1165 /* set DMA padding */ 1166 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1167 1168 /* configure draining */ 1169 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1170 if (!buf) { 1171 ata_dev_err(dev, "drain buffer allocation failed\n"); 1172 return -ENOMEM; 1173 } 1174 1175 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1176 } else { 1177 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1178 sdev->manage_start_stop = 1; 1179 } 1180 1181 /* 1182 * ata_pio_sectors() expects buffer for each sector to not cross 1183 * page boundary. Enforce it by requiring buffers to be sector 1184 * aligned, which works iff sector_size is not larger than 1185 * PAGE_SIZE. ATAPI devices also need the alignment as 1186 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1187 */ 1188 if (sdev->sector_size > PAGE_SIZE) 1189 ata_dev_warn(dev, 1190 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1191 sdev->sector_size); 1192 1193 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1194 1195 if (dev->flags & ATA_DFLAG_AN) 1196 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1197 1198 if (dev->flags & ATA_DFLAG_NCQ) { 1199 int depth; 1200 1201 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1202 depth = min(ATA_MAX_QUEUE - 1, depth); 1203 scsi_change_queue_depth(sdev, depth); 1204 } 1205 1206 blk_queue_flush_queueable(q, false); 1207 1208 dev->sdev = sdev; 1209 return 0; 1210 } 1211 1212 /** 1213 * ata_scsi_slave_config - Set SCSI device attributes 1214 * @sdev: SCSI device to examine 1215 * 1216 * This is called before we actually start reading 1217 * and writing to the device, to configure certain 1218 * SCSI mid-layer behaviors. 1219 * 1220 * LOCKING: 1221 * Defined by SCSI layer. We don't really care. 1222 */ 1223 1224 int ata_scsi_slave_config(struct scsi_device *sdev) 1225 { 1226 struct ata_port *ap = ata_shost_to_port(sdev->host); 1227 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1228 int rc = 0; 1229 1230 ata_scsi_sdev_config(sdev); 1231 1232 if (dev) 1233 rc = ata_scsi_dev_config(sdev, dev); 1234 1235 return rc; 1236 } 1237 1238 /** 1239 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1240 * @sdev: SCSI device to be destroyed 1241 * 1242 * @sdev is about to be destroyed for hot/warm unplugging. If 1243 * this unplugging was initiated by libata as indicated by NULL 1244 * dev->sdev, this function doesn't have to do anything. 1245 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1246 * Clear dev->sdev, schedule the device for ATA detach and invoke 1247 * EH. 1248 * 1249 * LOCKING: 1250 * Defined by SCSI layer. We don't really care. 1251 */ 1252 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1253 { 1254 struct ata_port *ap = ata_shost_to_port(sdev->host); 1255 struct request_queue *q = sdev->request_queue; 1256 unsigned long flags; 1257 struct ata_device *dev; 1258 1259 if (!ap->ops->error_handler) 1260 return; 1261 1262 spin_lock_irqsave(ap->lock, flags); 1263 dev = __ata_scsi_find_dev(ap, sdev); 1264 if (dev && dev->sdev) { 1265 /* SCSI device already in CANCEL state, no need to offline it */ 1266 dev->sdev = NULL; 1267 dev->flags |= ATA_DFLAG_DETACH; 1268 ata_port_schedule_eh(ap); 1269 } 1270 spin_unlock_irqrestore(ap->lock, flags); 1271 1272 kfree(q->dma_drain_buffer); 1273 q->dma_drain_buffer = NULL; 1274 q->dma_drain_size = 0; 1275 } 1276 1277 /** 1278 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1279 * @ap: ATA port to which the device change the queue depth 1280 * @sdev: SCSI device to configure queue depth for 1281 * @queue_depth: new queue depth 1282 * 1283 * libsas and libata have different approaches for associating a sdev to 1284 * its ata_port. 1285 * 1286 */ 1287 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1288 int queue_depth) 1289 { 1290 struct ata_device *dev; 1291 unsigned long flags; 1292 1293 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1294 return sdev->queue_depth; 1295 1296 dev = ata_scsi_find_dev(ap, sdev); 1297 if (!dev || !ata_dev_enabled(dev)) 1298 return sdev->queue_depth; 1299 1300 /* NCQ enabled? */ 1301 spin_lock_irqsave(ap->lock, flags); 1302 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1303 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1304 dev->flags |= ATA_DFLAG_NCQ_OFF; 1305 queue_depth = 1; 1306 } 1307 spin_unlock_irqrestore(ap->lock, flags); 1308 1309 /* limit and apply queue depth */ 1310 queue_depth = min(queue_depth, sdev->host->can_queue); 1311 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1312 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1313 1314 if (sdev->queue_depth == queue_depth) 1315 return -EINVAL; 1316 1317 return scsi_change_queue_depth(sdev, queue_depth); 1318 } 1319 1320 /** 1321 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1322 * @sdev: SCSI device to configure queue depth for 1323 * @queue_depth: new queue depth 1324 * 1325 * This is libata standard hostt->change_queue_depth callback. 1326 * SCSI will call into this callback when user tries to set queue 1327 * depth via sysfs. 1328 * 1329 * LOCKING: 1330 * SCSI layer (we don't care) 1331 * 1332 * RETURNS: 1333 * Newly configured queue depth. 1334 */ 1335 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1336 { 1337 struct ata_port *ap = ata_shost_to_port(sdev->host); 1338 1339 return __ata_change_queue_depth(ap, sdev, queue_depth); 1340 } 1341 1342 /** 1343 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1344 * @qc: Storage for translated ATA taskfile 1345 * 1346 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1347 * (to start). Perhaps these commands should be preceded by 1348 * CHECK POWER MODE to see what power mode the device is already in. 1349 * [See SAT revision 5 at www.t10.org] 1350 * 1351 * LOCKING: 1352 * spin_lock_irqsave(host lock) 1353 * 1354 * RETURNS: 1355 * Zero on success, non-zero on error. 1356 */ 1357 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1358 { 1359 struct scsi_cmnd *scmd = qc->scsicmd; 1360 struct ata_taskfile *tf = &qc->tf; 1361 const u8 *cdb = scmd->cmnd; 1362 1363 if (scmd->cmd_len < 5) 1364 goto invalid_fld; 1365 1366 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1367 tf->protocol = ATA_PROT_NODATA; 1368 if (cdb[1] & 0x1) { 1369 ; /* ignore IMMED bit, violates sat-r05 */ 1370 } 1371 if (cdb[4] & 0x2) 1372 goto invalid_fld; /* LOEJ bit set not supported */ 1373 if (((cdb[4] >> 4) & 0xf) != 0) 1374 goto invalid_fld; /* power conditions not supported */ 1375 1376 if (cdb[4] & 0x1) { 1377 tf->nsect = 1; /* 1 sector, lba=0 */ 1378 1379 if (qc->dev->flags & ATA_DFLAG_LBA) { 1380 tf->flags |= ATA_TFLAG_LBA; 1381 1382 tf->lbah = 0x0; 1383 tf->lbam = 0x0; 1384 tf->lbal = 0x0; 1385 tf->device |= ATA_LBA; 1386 } else { 1387 /* CHS */ 1388 tf->lbal = 0x1; /* sect */ 1389 tf->lbam = 0x0; /* cyl low */ 1390 tf->lbah = 0x0; /* cyl high */ 1391 } 1392 1393 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1394 } else { 1395 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1396 * or S5) causing some drives to spin up and down again. 1397 */ 1398 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1399 system_state == SYSTEM_POWER_OFF) 1400 goto skip; 1401 1402 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1403 system_entering_hibernation()) 1404 goto skip; 1405 1406 /* Issue ATA STANDBY IMMEDIATE command */ 1407 tf->command = ATA_CMD_STANDBYNOW1; 1408 } 1409 1410 /* 1411 * Standby and Idle condition timers could be implemented but that 1412 * would require libata to implement the Power condition mode page 1413 * and allow the user to change it. Changing mode pages requires 1414 * MODE SELECT to be implemented. 1415 */ 1416 1417 return 0; 1418 1419 invalid_fld: 1420 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1421 /* "Invalid field in cbd" */ 1422 return 1; 1423 skip: 1424 scmd->result = SAM_STAT_GOOD; 1425 return 1; 1426 } 1427 1428 1429 /** 1430 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1431 * @qc: Storage for translated ATA taskfile 1432 * 1433 * Sets up an ATA taskfile to issue FLUSH CACHE or 1434 * FLUSH CACHE EXT. 1435 * 1436 * LOCKING: 1437 * spin_lock_irqsave(host lock) 1438 * 1439 * RETURNS: 1440 * Zero on success, non-zero on error. 1441 */ 1442 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1443 { 1444 struct ata_taskfile *tf = &qc->tf; 1445 1446 tf->flags |= ATA_TFLAG_DEVICE; 1447 tf->protocol = ATA_PROT_NODATA; 1448 1449 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1450 tf->command = ATA_CMD_FLUSH_EXT; 1451 else 1452 tf->command = ATA_CMD_FLUSH; 1453 1454 /* flush is critical for IO integrity, consider it an IO command */ 1455 qc->flags |= ATA_QCFLAG_IO; 1456 1457 return 0; 1458 } 1459 1460 /** 1461 * scsi_6_lba_len - Get LBA and transfer length 1462 * @cdb: SCSI command to translate 1463 * 1464 * Calculate LBA and transfer length for 6-byte commands. 1465 * 1466 * RETURNS: 1467 * @plba: the LBA 1468 * @plen: the transfer length 1469 */ 1470 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1471 { 1472 u64 lba = 0; 1473 u32 len; 1474 1475 VPRINTK("six-byte command\n"); 1476 1477 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1478 lba |= ((u64)cdb[2]) << 8; 1479 lba |= ((u64)cdb[3]); 1480 1481 len = cdb[4]; 1482 1483 *plba = lba; 1484 *plen = len; 1485 } 1486 1487 /** 1488 * scsi_10_lba_len - Get LBA and transfer length 1489 * @cdb: SCSI command to translate 1490 * 1491 * Calculate LBA and transfer length for 10-byte commands. 1492 * 1493 * RETURNS: 1494 * @plba: the LBA 1495 * @plen: the transfer length 1496 */ 1497 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1498 { 1499 u64 lba = 0; 1500 u32 len = 0; 1501 1502 VPRINTK("ten-byte command\n"); 1503 1504 lba |= ((u64)cdb[2]) << 24; 1505 lba |= ((u64)cdb[3]) << 16; 1506 lba |= ((u64)cdb[4]) << 8; 1507 lba |= ((u64)cdb[5]); 1508 1509 len |= ((u32)cdb[7]) << 8; 1510 len |= ((u32)cdb[8]); 1511 1512 *plba = lba; 1513 *plen = len; 1514 } 1515 1516 /** 1517 * scsi_16_lba_len - Get LBA and transfer length 1518 * @cdb: SCSI command to translate 1519 * 1520 * Calculate LBA and transfer length for 16-byte commands. 1521 * 1522 * RETURNS: 1523 * @plba: the LBA 1524 * @plen: the transfer length 1525 */ 1526 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1527 { 1528 u64 lba = 0; 1529 u32 len = 0; 1530 1531 VPRINTK("sixteen-byte command\n"); 1532 1533 lba |= ((u64)cdb[2]) << 56; 1534 lba |= ((u64)cdb[3]) << 48; 1535 lba |= ((u64)cdb[4]) << 40; 1536 lba |= ((u64)cdb[5]) << 32; 1537 lba |= ((u64)cdb[6]) << 24; 1538 lba |= ((u64)cdb[7]) << 16; 1539 lba |= ((u64)cdb[8]) << 8; 1540 lba |= ((u64)cdb[9]); 1541 1542 len |= ((u32)cdb[10]) << 24; 1543 len |= ((u32)cdb[11]) << 16; 1544 len |= ((u32)cdb[12]) << 8; 1545 len |= ((u32)cdb[13]); 1546 1547 *plba = lba; 1548 *plen = len; 1549 } 1550 1551 /** 1552 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1553 * @qc: Storage for translated ATA taskfile 1554 * 1555 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1556 * 1557 * LOCKING: 1558 * spin_lock_irqsave(host lock) 1559 * 1560 * RETURNS: 1561 * Zero on success, non-zero on error. 1562 */ 1563 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1564 { 1565 struct scsi_cmnd *scmd = qc->scsicmd; 1566 struct ata_taskfile *tf = &qc->tf; 1567 struct ata_device *dev = qc->dev; 1568 u64 dev_sectors = qc->dev->n_sectors; 1569 const u8 *cdb = scmd->cmnd; 1570 u64 block; 1571 u32 n_block; 1572 1573 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1574 tf->protocol = ATA_PROT_NODATA; 1575 1576 if (cdb[0] == VERIFY) { 1577 if (scmd->cmd_len < 10) 1578 goto invalid_fld; 1579 scsi_10_lba_len(cdb, &block, &n_block); 1580 } else if (cdb[0] == VERIFY_16) { 1581 if (scmd->cmd_len < 16) 1582 goto invalid_fld; 1583 scsi_16_lba_len(cdb, &block, &n_block); 1584 } else 1585 goto invalid_fld; 1586 1587 if (!n_block) 1588 goto nothing_to_do; 1589 if (block >= dev_sectors) 1590 goto out_of_range; 1591 if ((block + n_block) > dev_sectors) 1592 goto out_of_range; 1593 1594 if (dev->flags & ATA_DFLAG_LBA) { 1595 tf->flags |= ATA_TFLAG_LBA; 1596 1597 if (lba_28_ok(block, n_block)) { 1598 /* use LBA28 */ 1599 tf->command = ATA_CMD_VERIFY; 1600 tf->device |= (block >> 24) & 0xf; 1601 } else if (lba_48_ok(block, n_block)) { 1602 if (!(dev->flags & ATA_DFLAG_LBA48)) 1603 goto out_of_range; 1604 1605 /* use LBA48 */ 1606 tf->flags |= ATA_TFLAG_LBA48; 1607 tf->command = ATA_CMD_VERIFY_EXT; 1608 1609 tf->hob_nsect = (n_block >> 8) & 0xff; 1610 1611 tf->hob_lbah = (block >> 40) & 0xff; 1612 tf->hob_lbam = (block >> 32) & 0xff; 1613 tf->hob_lbal = (block >> 24) & 0xff; 1614 } else 1615 /* request too large even for LBA48 */ 1616 goto out_of_range; 1617 1618 tf->nsect = n_block & 0xff; 1619 1620 tf->lbah = (block >> 16) & 0xff; 1621 tf->lbam = (block >> 8) & 0xff; 1622 tf->lbal = block & 0xff; 1623 1624 tf->device |= ATA_LBA; 1625 } else { 1626 /* CHS */ 1627 u32 sect, head, cyl, track; 1628 1629 if (!lba_28_ok(block, n_block)) 1630 goto out_of_range; 1631 1632 /* Convert LBA to CHS */ 1633 track = (u32)block / dev->sectors; 1634 cyl = track / dev->heads; 1635 head = track % dev->heads; 1636 sect = (u32)block % dev->sectors + 1; 1637 1638 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1639 (u32)block, track, cyl, head, sect); 1640 1641 /* Check whether the converted CHS can fit. 1642 Cylinder: 0-65535 1643 Head: 0-15 1644 Sector: 1-255*/ 1645 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1646 goto out_of_range; 1647 1648 tf->command = ATA_CMD_VERIFY; 1649 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1650 tf->lbal = sect; 1651 tf->lbam = cyl; 1652 tf->lbah = cyl >> 8; 1653 tf->device |= head; 1654 } 1655 1656 return 0; 1657 1658 invalid_fld: 1659 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1660 /* "Invalid field in cbd" */ 1661 return 1; 1662 1663 out_of_range: 1664 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1665 /* "Logical Block Address out of range" */ 1666 return 1; 1667 1668 nothing_to_do: 1669 scmd->result = SAM_STAT_GOOD; 1670 return 1; 1671 } 1672 1673 /** 1674 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1675 * @qc: Storage for translated ATA taskfile 1676 * 1677 * Converts any of six SCSI read/write commands into the 1678 * ATA counterpart, including starting sector (LBA), 1679 * sector count, and taking into account the device's LBA48 1680 * support. 1681 * 1682 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1683 * %WRITE_16 are currently supported. 1684 * 1685 * LOCKING: 1686 * spin_lock_irqsave(host lock) 1687 * 1688 * RETURNS: 1689 * Zero on success, non-zero on error. 1690 */ 1691 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1692 { 1693 struct scsi_cmnd *scmd = qc->scsicmd; 1694 const u8 *cdb = scmd->cmnd; 1695 unsigned int tf_flags = 0; 1696 u64 block; 1697 u32 n_block; 1698 int rc; 1699 1700 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1701 tf_flags |= ATA_TFLAG_WRITE; 1702 1703 /* Calculate the SCSI LBA, transfer length and FUA. */ 1704 switch (cdb[0]) { 1705 case READ_10: 1706 case WRITE_10: 1707 if (unlikely(scmd->cmd_len < 10)) 1708 goto invalid_fld; 1709 scsi_10_lba_len(cdb, &block, &n_block); 1710 if (cdb[1] & (1 << 3)) 1711 tf_flags |= ATA_TFLAG_FUA; 1712 break; 1713 case READ_6: 1714 case WRITE_6: 1715 if (unlikely(scmd->cmd_len < 6)) 1716 goto invalid_fld; 1717 scsi_6_lba_len(cdb, &block, &n_block); 1718 1719 /* for 6-byte r/w commands, transfer length 0 1720 * means 256 blocks of data, not 0 block. 1721 */ 1722 if (!n_block) 1723 n_block = 256; 1724 break; 1725 case READ_16: 1726 case WRITE_16: 1727 if (unlikely(scmd->cmd_len < 16)) 1728 goto invalid_fld; 1729 scsi_16_lba_len(cdb, &block, &n_block); 1730 if (cdb[1] & (1 << 3)) 1731 tf_flags |= ATA_TFLAG_FUA; 1732 break; 1733 default: 1734 DPRINTK("no-byte command\n"); 1735 goto invalid_fld; 1736 } 1737 1738 /* Check and compose ATA command */ 1739 if (!n_block) 1740 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1741 * length 0 means transfer 0 block of data. 1742 * However, for ATA R/W commands, sector count 0 means 1743 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1744 * 1745 * WARNING: one or two older ATA drives treat 0 as 0... 1746 */ 1747 goto nothing_to_do; 1748 1749 qc->flags |= ATA_QCFLAG_IO; 1750 qc->nbytes = n_block * scmd->device->sector_size; 1751 1752 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1753 qc->tag); 1754 if (likely(rc == 0)) 1755 return 0; 1756 1757 if (rc == -ERANGE) 1758 goto out_of_range; 1759 /* treat all other errors as -EINVAL, fall through */ 1760 invalid_fld: 1761 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1762 /* "Invalid field in cbd" */ 1763 return 1; 1764 1765 out_of_range: 1766 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1767 /* "Logical Block Address out of range" */ 1768 return 1; 1769 1770 nothing_to_do: 1771 scmd->result = SAM_STAT_GOOD; 1772 return 1; 1773 } 1774 1775 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1776 { 1777 struct ata_port *ap = qc->ap; 1778 struct scsi_cmnd *cmd = qc->scsicmd; 1779 u8 *cdb = cmd->cmnd; 1780 int need_sense = (qc->err_mask != 0); 1781 1782 /* For ATA pass thru (SAT) commands, generate a sense block if 1783 * user mandated it or if there's an error. Note that if we 1784 * generate because the user forced us to [CK_COND =1], a check 1785 * condition is generated and the ATA register values are returned 1786 * whether the command completed successfully or not. If there 1787 * was no error, we use the following sense data: 1788 * sk = RECOVERED ERROR 1789 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1790 */ 1791 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1792 ((cdb[2] & 0x20) || need_sense)) { 1793 ata_gen_passthru_sense(qc); 1794 } else { 1795 if (qc->flags & ATA_QCFLAG_SENSE_VALID) { 1796 cmd->result = SAM_STAT_CHECK_CONDITION; 1797 } else if (!need_sense) { 1798 cmd->result = SAM_STAT_GOOD; 1799 } else { 1800 /* TODO: decide which descriptor format to use 1801 * for 48b LBA devices and call that here 1802 * instead of the fixed desc, which is only 1803 * good for smaller LBA (and maybe CHS?) 1804 * devices. 1805 */ 1806 ata_gen_ata_sense(qc); 1807 } 1808 } 1809 1810 if (need_sense && !ap->ops->error_handler) 1811 ata_dump_status(ap->print_id, &qc->result_tf); 1812 1813 qc->scsidone(cmd); 1814 1815 ata_qc_free(qc); 1816 } 1817 1818 /** 1819 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1820 * @dev: ATA device to which the command is addressed 1821 * @cmd: SCSI command to execute 1822 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1823 * 1824 * Our ->queuecommand() function has decided that the SCSI 1825 * command issued can be directly translated into an ATA 1826 * command, rather than handled internally. 1827 * 1828 * This function sets up an ata_queued_cmd structure for the 1829 * SCSI command, and sends that ata_queued_cmd to the hardware. 1830 * 1831 * The xlat_func argument (actor) returns 0 if ready to execute 1832 * ATA command, else 1 to finish translation. If 1 is returned 1833 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1834 * to be set reflecting an error condition or clean (early) 1835 * termination. 1836 * 1837 * LOCKING: 1838 * spin_lock_irqsave(host lock) 1839 * 1840 * RETURNS: 1841 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1842 * needs to be deferred. 1843 */ 1844 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1845 ata_xlat_func_t xlat_func) 1846 { 1847 struct ata_port *ap = dev->link->ap; 1848 struct ata_queued_cmd *qc; 1849 int rc; 1850 1851 VPRINTK("ENTER\n"); 1852 1853 qc = ata_scsi_qc_new(dev, cmd); 1854 if (!qc) 1855 goto err_mem; 1856 1857 /* data is present; dma-map it */ 1858 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1859 cmd->sc_data_direction == DMA_TO_DEVICE) { 1860 if (unlikely(scsi_bufflen(cmd) < 1)) { 1861 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1862 goto err_did; 1863 } 1864 1865 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1866 1867 qc->dma_dir = cmd->sc_data_direction; 1868 } 1869 1870 qc->complete_fn = ata_scsi_qc_complete; 1871 1872 if (xlat_func(qc)) 1873 goto early_finish; 1874 1875 if (ap->ops->qc_defer) { 1876 if ((rc = ap->ops->qc_defer(qc))) 1877 goto defer; 1878 } 1879 1880 /* select device, send command to hardware */ 1881 ata_qc_issue(qc); 1882 1883 VPRINTK("EXIT\n"); 1884 return 0; 1885 1886 early_finish: 1887 ata_qc_free(qc); 1888 cmd->scsi_done(cmd); 1889 DPRINTK("EXIT - early finish (good or error)\n"); 1890 return 0; 1891 1892 err_did: 1893 ata_qc_free(qc); 1894 cmd->result = (DID_ERROR << 16); 1895 cmd->scsi_done(cmd); 1896 err_mem: 1897 DPRINTK("EXIT - internal\n"); 1898 return 0; 1899 1900 defer: 1901 ata_qc_free(qc); 1902 DPRINTK("EXIT - defer\n"); 1903 if (rc == ATA_DEFER_LINK) 1904 return SCSI_MLQUEUE_DEVICE_BUSY; 1905 else 1906 return SCSI_MLQUEUE_HOST_BUSY; 1907 } 1908 1909 /** 1910 * ata_scsi_rbuf_get - Map response buffer. 1911 * @cmd: SCSI command containing buffer to be mapped. 1912 * @flags: unsigned long variable to store irq enable status 1913 * @copy_in: copy in from user buffer 1914 * 1915 * Prepare buffer for simulated SCSI commands. 1916 * 1917 * LOCKING: 1918 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1919 * 1920 * RETURNS: 1921 * Pointer to response buffer. 1922 */ 1923 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1924 unsigned long *flags) 1925 { 1926 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1927 1928 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1929 if (copy_in) 1930 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1931 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1932 return ata_scsi_rbuf; 1933 } 1934 1935 /** 1936 * ata_scsi_rbuf_put - Unmap response buffer. 1937 * @cmd: SCSI command containing buffer to be unmapped. 1938 * @copy_out: copy out result 1939 * @flags: @flags passed to ata_scsi_rbuf_get() 1940 * 1941 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1942 * @copy_back is true. 1943 * 1944 * LOCKING: 1945 * Unlocks ata_scsi_rbuf_lock. 1946 */ 1947 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1948 unsigned long *flags) 1949 { 1950 if (copy_out) 1951 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1952 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1953 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1954 } 1955 1956 /** 1957 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1958 * @args: device IDENTIFY data / SCSI command of interest. 1959 * @actor: Callback hook for desired SCSI command simulator 1960 * 1961 * Takes care of the hard work of simulating a SCSI command... 1962 * Mapping the response buffer, calling the command's handler, 1963 * and handling the handler's return value. This return value 1964 * indicates whether the handler wishes the SCSI command to be 1965 * completed successfully (0), or not (in which case cmd->result 1966 * and sense buffer are assumed to be set). 1967 * 1968 * LOCKING: 1969 * spin_lock_irqsave(host lock) 1970 */ 1971 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1972 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1973 { 1974 u8 *rbuf; 1975 unsigned int rc; 1976 struct scsi_cmnd *cmd = args->cmd; 1977 unsigned long flags; 1978 1979 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1980 rc = actor(args, rbuf); 1981 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1982 1983 if (rc == 0) 1984 cmd->result = SAM_STAT_GOOD; 1985 args->done(cmd); 1986 } 1987 1988 /** 1989 * ata_scsiop_inq_std - Simulate INQUIRY command 1990 * @args: device IDENTIFY data / SCSI command of interest. 1991 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1992 * 1993 * Returns standard device identification data associated 1994 * with non-VPD INQUIRY command output. 1995 * 1996 * LOCKING: 1997 * spin_lock_irqsave(host lock) 1998 */ 1999 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 2000 { 2001 const u8 versions[] = { 2002 0x00, 2003 0x60, /* SAM-3 (no version claimed) */ 2004 2005 0x03, 2006 0x20, /* SBC-2 (no version claimed) */ 2007 2008 0x02, 2009 0x60 /* SPC-3 (no version claimed) */ 2010 }; 2011 const u8 versions_zbc[] = { 2012 0x00, 2013 0xA0, /* SAM-5 (no version claimed) */ 2014 2015 0x04, 2016 0xC0, /* SBC-3 (no version claimed) */ 2017 2018 0x04, 2019 0x60, /* SPC-4 (no version claimed) */ 2020 2021 0x60, 2022 0x20, /* ZBC (no version claimed) */ 2023 }; 2024 2025 u8 hdr[] = { 2026 TYPE_DISK, 2027 0, 2028 0x5, /* claim SPC-3 version compatibility */ 2029 2, 2030 95 - 4 2031 }; 2032 2033 VPRINTK("ENTER\n"); 2034 2035 /* set scsi removable (RMB) bit per ata bit */ 2036 if (ata_id_removable(args->id)) 2037 hdr[1] |= (1 << 7); 2038 2039 if (args->dev->class == ATA_DEV_ZAC) { 2040 hdr[0] = TYPE_ZBC; 2041 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */ 2042 } 2043 2044 memcpy(rbuf, hdr, sizeof(hdr)); 2045 memcpy(&rbuf[8], "ATA ", 8); 2046 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 2047 2048 /* From SAT, use last 2 words from fw rev unless they are spaces */ 2049 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 2050 if (strncmp(&rbuf[32], " ", 4) == 0) 2051 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2052 2053 if (rbuf[32] == 0 || rbuf[32] == ' ') 2054 memcpy(&rbuf[32], "n/a ", 4); 2055 2056 if (args->dev->class == ATA_DEV_ZAC) 2057 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 2058 else 2059 memcpy(rbuf + 58, versions, sizeof(versions)); 2060 2061 return 0; 2062 } 2063 2064 /** 2065 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2066 * @args: device IDENTIFY data / SCSI command of interest. 2067 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2068 * 2069 * Returns list of inquiry VPD pages available. 2070 * 2071 * LOCKING: 2072 * spin_lock_irqsave(host lock) 2073 */ 2074 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2075 { 2076 const u8 pages[] = { 2077 0x00, /* page 0x00, this page */ 2078 0x80, /* page 0x80, unit serial no page */ 2079 0x83, /* page 0x83, device ident page */ 2080 0x89, /* page 0x89, ata info page */ 2081 0xb0, /* page 0xb0, block limits page */ 2082 0xb1, /* page 0xb1, block device characteristics page */ 2083 0xb2, /* page 0xb2, thin provisioning page */ 2084 }; 2085 2086 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2087 memcpy(rbuf + 4, pages, sizeof(pages)); 2088 return 0; 2089 } 2090 2091 /** 2092 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2093 * @args: device IDENTIFY data / SCSI command of interest. 2094 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2095 * 2096 * Returns ATA device serial number. 2097 * 2098 * LOCKING: 2099 * spin_lock_irqsave(host lock) 2100 */ 2101 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2102 { 2103 const u8 hdr[] = { 2104 0, 2105 0x80, /* this page code */ 2106 0, 2107 ATA_ID_SERNO_LEN, /* page len */ 2108 }; 2109 2110 memcpy(rbuf, hdr, sizeof(hdr)); 2111 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2112 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2113 return 0; 2114 } 2115 2116 /** 2117 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2118 * @args: device IDENTIFY data / SCSI command of interest. 2119 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2120 * 2121 * Yields two logical unit device identification designators: 2122 * - vendor specific ASCII containing the ATA serial number 2123 * - SAT defined "t10 vendor id based" containing ASCII vendor 2124 * name ("ATA "), model and serial numbers. 2125 * 2126 * LOCKING: 2127 * spin_lock_irqsave(host lock) 2128 */ 2129 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2130 { 2131 const int sat_model_serial_desc_len = 68; 2132 int num; 2133 2134 rbuf[1] = 0x83; /* this page code */ 2135 num = 4; 2136 2137 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2138 rbuf[num + 0] = 2; 2139 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2140 num += 4; 2141 ata_id_string(args->id, (unsigned char *) rbuf + num, 2142 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2143 num += ATA_ID_SERNO_LEN; 2144 2145 /* SAT defined lu model and serial numbers descriptor */ 2146 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2147 rbuf[num + 0] = 2; 2148 rbuf[num + 1] = 1; 2149 rbuf[num + 3] = sat_model_serial_desc_len; 2150 num += 4; 2151 memcpy(rbuf + num, "ATA ", 8); 2152 num += 8; 2153 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2154 ATA_ID_PROD_LEN); 2155 num += ATA_ID_PROD_LEN; 2156 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2157 ATA_ID_SERNO_LEN); 2158 num += ATA_ID_SERNO_LEN; 2159 2160 if (ata_id_has_wwn(args->id)) { 2161 /* SAT defined lu world wide name */ 2162 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2163 rbuf[num + 0] = 1; 2164 rbuf[num + 1] = 3; 2165 rbuf[num + 3] = ATA_ID_WWN_LEN; 2166 num += 4; 2167 ata_id_string(args->id, (unsigned char *) rbuf + num, 2168 ATA_ID_WWN, ATA_ID_WWN_LEN); 2169 num += ATA_ID_WWN_LEN; 2170 } 2171 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2172 return 0; 2173 } 2174 2175 /** 2176 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2177 * @args: device IDENTIFY data / SCSI command of interest. 2178 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2179 * 2180 * Yields SAT-specified ATA VPD page. 2181 * 2182 * LOCKING: 2183 * spin_lock_irqsave(host lock) 2184 */ 2185 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2186 { 2187 struct ata_taskfile tf; 2188 2189 memset(&tf, 0, sizeof(tf)); 2190 2191 rbuf[1] = 0x89; /* our page code */ 2192 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2193 rbuf[3] = (0x238 & 0xff); 2194 2195 memcpy(&rbuf[8], "linux ", 8); 2196 memcpy(&rbuf[16], "libata ", 16); 2197 memcpy(&rbuf[32], DRV_VERSION, 4); 2198 2199 /* we don't store the ATA device signature, so we fake it */ 2200 2201 tf.command = ATA_DRDY; /* really, this is Status reg */ 2202 tf.lbal = 0x1; 2203 tf.nsect = 0x1; 2204 2205 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2206 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2207 2208 rbuf[56] = ATA_CMD_ID_ATA; 2209 2210 memcpy(&rbuf[60], &args->id[0], 512); 2211 return 0; 2212 } 2213 2214 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2215 { 2216 u16 min_io_sectors; 2217 2218 rbuf[1] = 0xb0; 2219 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2220 2221 /* 2222 * Optimal transfer length granularity. 2223 * 2224 * This is always one physical block, but for disks with a smaller 2225 * logical than physical sector size we need to figure out what the 2226 * latter is. 2227 */ 2228 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2229 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2230 2231 /* 2232 * Optimal unmap granularity. 2233 * 2234 * The ATA spec doesn't even know about a granularity or alignment 2235 * for the TRIM command. We can leave away most of the unmap related 2236 * VPD page entries, but we have specifify a granularity to signal 2237 * that we support some form of unmap - in thise case via WRITE SAME 2238 * with the unmap bit set. 2239 */ 2240 if (ata_id_has_trim(args->id)) { 2241 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2242 put_unaligned_be32(1, &rbuf[28]); 2243 } 2244 2245 return 0; 2246 } 2247 2248 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2249 { 2250 int form_factor = ata_id_form_factor(args->id); 2251 int media_rotation_rate = ata_id_rotation_rate(args->id); 2252 2253 rbuf[1] = 0xb1; 2254 rbuf[3] = 0x3c; 2255 rbuf[4] = media_rotation_rate >> 8; 2256 rbuf[5] = media_rotation_rate; 2257 rbuf[7] = form_factor; 2258 2259 return 0; 2260 } 2261 2262 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2263 { 2264 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2265 rbuf[1] = 0xb2; 2266 rbuf[3] = 0x4; 2267 rbuf[5] = 1 << 6; /* TPWS */ 2268 2269 return 0; 2270 } 2271 2272 /** 2273 * ata_scsiop_noop - Command handler that simply returns success. 2274 * @args: device IDENTIFY data / SCSI command of interest. 2275 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2276 * 2277 * No operation. Simply returns success to caller, to indicate 2278 * that the caller should successfully complete this SCSI command. 2279 * 2280 * LOCKING: 2281 * spin_lock_irqsave(host lock) 2282 */ 2283 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2284 { 2285 VPRINTK("ENTER\n"); 2286 return 0; 2287 } 2288 2289 /** 2290 * modecpy - Prepare response for MODE SENSE 2291 * @dest: output buffer 2292 * @src: data being copied 2293 * @n: length of mode page 2294 * @changeable: whether changeable parameters are requested 2295 * 2296 * Generate a generic MODE SENSE page for either current or changeable 2297 * parameters. 2298 * 2299 * LOCKING: 2300 * None. 2301 */ 2302 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2303 { 2304 if (changeable) { 2305 memcpy(dest, src, 2); 2306 memset(dest + 2, 0, n - 2); 2307 } else { 2308 memcpy(dest, src, n); 2309 } 2310 } 2311 2312 /** 2313 * ata_msense_caching - Simulate MODE SENSE caching info page 2314 * @id: device IDENTIFY data 2315 * @buf: output buffer 2316 * @changeable: whether changeable parameters are requested 2317 * 2318 * Generate a caching info page, which conditionally indicates 2319 * write caching to the SCSI layer, depending on device 2320 * capabilities. 2321 * 2322 * LOCKING: 2323 * None. 2324 */ 2325 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2326 { 2327 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2328 if (changeable || ata_id_wcache_enabled(id)) 2329 buf[2] |= (1 << 2); /* write cache enable */ 2330 if (!changeable && !ata_id_rahead_enabled(id)) 2331 buf[12] |= (1 << 5); /* disable read ahead */ 2332 return sizeof(def_cache_mpage); 2333 } 2334 2335 /** 2336 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2337 * @buf: output buffer 2338 * @changeable: whether changeable parameters are requested 2339 * 2340 * Generate a generic MODE SENSE control mode page. 2341 * 2342 * LOCKING: 2343 * None. 2344 */ 2345 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2346 { 2347 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2348 return sizeof(def_control_mpage); 2349 } 2350 2351 /** 2352 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2353 * @buf: output buffer 2354 * @changeable: whether changeable parameters are requested 2355 * 2356 * Generate a generic MODE SENSE r/w error recovery page. 2357 * 2358 * LOCKING: 2359 * None. 2360 */ 2361 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2362 { 2363 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2364 changeable); 2365 return sizeof(def_rw_recovery_mpage); 2366 } 2367 2368 /* 2369 * We can turn this into a real blacklist if it's needed, for now just 2370 * blacklist any Maxtor BANC1G10 revision firmware 2371 */ 2372 static int ata_dev_supports_fua(u16 *id) 2373 { 2374 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2375 2376 if (!libata_fua) 2377 return 0; 2378 if (!ata_id_has_fua(id)) 2379 return 0; 2380 2381 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2382 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2383 2384 if (strcmp(model, "Maxtor")) 2385 return 1; 2386 if (strcmp(fw, "BANC1G10")) 2387 return 1; 2388 2389 return 0; /* blacklisted */ 2390 } 2391 2392 /** 2393 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2394 * @args: device IDENTIFY data / SCSI command of interest. 2395 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2396 * 2397 * Simulate MODE SENSE commands. Assume this is invoked for direct 2398 * access devices (e.g. disks) only. There should be no block 2399 * descriptor for other device types. 2400 * 2401 * LOCKING: 2402 * spin_lock_irqsave(host lock) 2403 */ 2404 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2405 { 2406 struct ata_device *dev = args->dev; 2407 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2408 const u8 sat_blk_desc[] = { 2409 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2410 0, 2411 0, 0x2, 0x0 /* block length: 512 bytes */ 2412 }; 2413 u8 pg, spg; 2414 unsigned int ebd, page_control, six_byte; 2415 u8 dpofua; 2416 2417 VPRINTK("ENTER\n"); 2418 2419 six_byte = (scsicmd[0] == MODE_SENSE); 2420 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2421 /* 2422 * LLBA bit in msense(10) ignored (compliant) 2423 */ 2424 2425 page_control = scsicmd[2] >> 6; 2426 switch (page_control) { 2427 case 0: /* current */ 2428 case 1: /* changeable */ 2429 case 2: /* defaults */ 2430 break; /* supported */ 2431 case 3: /* saved */ 2432 goto saving_not_supp; 2433 default: 2434 goto invalid_fld; 2435 } 2436 2437 if (six_byte) 2438 p += 4 + (ebd ? 8 : 0); 2439 else 2440 p += 8 + (ebd ? 8 : 0); 2441 2442 pg = scsicmd[2] & 0x3f; 2443 spg = scsicmd[3]; 2444 /* 2445 * No mode subpages supported (yet) but asking for _all_ 2446 * subpages may be valid 2447 */ 2448 if (spg && (spg != ALL_SUB_MPAGES)) 2449 goto invalid_fld; 2450 2451 switch(pg) { 2452 case RW_RECOVERY_MPAGE: 2453 p += ata_msense_rw_recovery(p, page_control == 1); 2454 break; 2455 2456 case CACHE_MPAGE: 2457 p += ata_msense_caching(args->id, p, page_control == 1); 2458 break; 2459 2460 case CONTROL_MPAGE: 2461 p += ata_msense_ctl_mode(p, page_control == 1); 2462 break; 2463 2464 case ALL_MPAGES: 2465 p += ata_msense_rw_recovery(p, page_control == 1); 2466 p += ata_msense_caching(args->id, p, page_control == 1); 2467 p += ata_msense_ctl_mode(p, page_control == 1); 2468 break; 2469 2470 default: /* invalid page code */ 2471 goto invalid_fld; 2472 } 2473 2474 dpofua = 0; 2475 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2476 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2477 dpofua = 1 << 4; 2478 2479 if (six_byte) { 2480 rbuf[0] = p - rbuf - 1; 2481 rbuf[2] |= dpofua; 2482 if (ebd) { 2483 rbuf[3] = sizeof(sat_blk_desc); 2484 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2485 } 2486 } else { 2487 unsigned int output_len = p - rbuf - 2; 2488 2489 rbuf[0] = output_len >> 8; 2490 rbuf[1] = output_len; 2491 rbuf[3] |= dpofua; 2492 if (ebd) { 2493 rbuf[7] = sizeof(sat_blk_desc); 2494 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2495 } 2496 } 2497 return 0; 2498 2499 invalid_fld: 2500 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2501 /* "Invalid field in cbd" */ 2502 return 1; 2503 2504 saving_not_supp: 2505 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2506 /* "Saving parameters not supported" */ 2507 return 1; 2508 } 2509 2510 /** 2511 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2512 * @args: device IDENTIFY data / SCSI command of interest. 2513 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2514 * 2515 * Simulate READ CAPACITY commands. 2516 * 2517 * LOCKING: 2518 * None. 2519 */ 2520 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2521 { 2522 struct ata_device *dev = args->dev; 2523 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2524 u32 sector_size; /* physical sector size in bytes */ 2525 u8 log2_per_phys; 2526 u16 lowest_aligned; 2527 2528 sector_size = ata_id_logical_sector_size(dev->id); 2529 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2530 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2531 2532 VPRINTK("ENTER\n"); 2533 2534 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2535 if (last_lba >= 0xffffffffULL) 2536 last_lba = 0xffffffff; 2537 2538 /* sector count, 32-bit */ 2539 rbuf[0] = last_lba >> (8 * 3); 2540 rbuf[1] = last_lba >> (8 * 2); 2541 rbuf[2] = last_lba >> (8 * 1); 2542 rbuf[3] = last_lba; 2543 2544 /* sector size */ 2545 rbuf[4] = sector_size >> (8 * 3); 2546 rbuf[5] = sector_size >> (8 * 2); 2547 rbuf[6] = sector_size >> (8 * 1); 2548 rbuf[7] = sector_size; 2549 } else { 2550 /* sector count, 64-bit */ 2551 rbuf[0] = last_lba >> (8 * 7); 2552 rbuf[1] = last_lba >> (8 * 6); 2553 rbuf[2] = last_lba >> (8 * 5); 2554 rbuf[3] = last_lba >> (8 * 4); 2555 rbuf[4] = last_lba >> (8 * 3); 2556 rbuf[5] = last_lba >> (8 * 2); 2557 rbuf[6] = last_lba >> (8 * 1); 2558 rbuf[7] = last_lba; 2559 2560 /* sector size */ 2561 rbuf[ 8] = sector_size >> (8 * 3); 2562 rbuf[ 9] = sector_size >> (8 * 2); 2563 rbuf[10] = sector_size >> (8 * 1); 2564 rbuf[11] = sector_size; 2565 2566 rbuf[12] = 0; 2567 rbuf[13] = log2_per_phys; 2568 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2569 rbuf[15] = lowest_aligned; 2570 2571 if (ata_id_has_trim(args->id)) { 2572 rbuf[14] |= 0x80; /* LBPME */ 2573 2574 if (ata_id_has_zero_after_trim(args->id) && 2575 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2576 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2577 rbuf[14] |= 0x40; /* LBPRZ */ 2578 } 2579 } 2580 } 2581 return 0; 2582 } 2583 2584 /** 2585 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2586 * @args: device IDENTIFY data / SCSI command of interest. 2587 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2588 * 2589 * Simulate REPORT LUNS command. 2590 * 2591 * LOCKING: 2592 * spin_lock_irqsave(host lock) 2593 */ 2594 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2595 { 2596 VPRINTK("ENTER\n"); 2597 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2598 2599 return 0; 2600 } 2601 2602 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2603 { 2604 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2605 /* FIXME: not quite right; we don't want the 2606 * translation of taskfile registers into 2607 * a sense descriptors, since that's only 2608 * correct for ATA, not ATAPI 2609 */ 2610 ata_gen_passthru_sense(qc); 2611 } 2612 2613 qc->scsidone(qc->scsicmd); 2614 ata_qc_free(qc); 2615 } 2616 2617 /* is it pointless to prefer PIO for "safety reasons"? */ 2618 static inline int ata_pio_use_silly(struct ata_port *ap) 2619 { 2620 return (ap->flags & ATA_FLAG_PIO_DMA); 2621 } 2622 2623 static void atapi_request_sense(struct ata_queued_cmd *qc) 2624 { 2625 struct ata_port *ap = qc->ap; 2626 struct scsi_cmnd *cmd = qc->scsicmd; 2627 2628 DPRINTK("ATAPI request sense\n"); 2629 2630 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2631 2632 #ifdef CONFIG_ATA_SFF 2633 if (ap->ops->sff_tf_read) 2634 ap->ops->sff_tf_read(ap, &qc->tf); 2635 #endif 2636 2637 /* fill these in, for the case where they are -not- overwritten */ 2638 cmd->sense_buffer[0] = 0x70; 2639 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2640 2641 ata_qc_reinit(qc); 2642 2643 /* setup sg table and init transfer direction */ 2644 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2645 ata_sg_init(qc, &qc->sgent, 1); 2646 qc->dma_dir = DMA_FROM_DEVICE; 2647 2648 memset(&qc->cdb, 0, qc->dev->cdb_len); 2649 qc->cdb[0] = REQUEST_SENSE; 2650 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2651 2652 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2653 qc->tf.command = ATA_CMD_PACKET; 2654 2655 if (ata_pio_use_silly(ap)) { 2656 qc->tf.protocol = ATAPI_PROT_DMA; 2657 qc->tf.feature |= ATAPI_PKT_DMA; 2658 } else { 2659 qc->tf.protocol = ATAPI_PROT_PIO; 2660 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2661 qc->tf.lbah = 0; 2662 } 2663 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2664 2665 qc->complete_fn = atapi_sense_complete; 2666 2667 ata_qc_issue(qc); 2668 2669 DPRINTK("EXIT\n"); 2670 } 2671 2672 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2673 { 2674 struct scsi_cmnd *cmd = qc->scsicmd; 2675 unsigned int err_mask = qc->err_mask; 2676 2677 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2678 2679 /* handle completion from new EH */ 2680 if (unlikely(qc->ap->ops->error_handler && 2681 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2682 2683 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2684 /* FIXME: not quite right; we don't want the 2685 * translation of taskfile registers into a 2686 * sense descriptors, since that's only 2687 * correct for ATA, not ATAPI 2688 */ 2689 ata_gen_passthru_sense(qc); 2690 } 2691 2692 /* SCSI EH automatically locks door if sdev->locked is 2693 * set. Sometimes door lock request continues to 2694 * fail, for example, when no media is present. This 2695 * creates a loop - SCSI EH issues door lock which 2696 * fails and gets invoked again to acquire sense data 2697 * for the failed command. 2698 * 2699 * If door lock fails, always clear sdev->locked to 2700 * avoid this infinite loop. 2701 * 2702 * This may happen before SCSI scan is complete. Make 2703 * sure qc->dev->sdev isn't NULL before dereferencing. 2704 */ 2705 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2706 qc->dev->sdev->locked = 0; 2707 2708 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2709 qc->scsidone(cmd); 2710 ata_qc_free(qc); 2711 return; 2712 } 2713 2714 /* successful completion or old EH failure path */ 2715 if (unlikely(err_mask & AC_ERR_DEV)) { 2716 cmd->result = SAM_STAT_CHECK_CONDITION; 2717 atapi_request_sense(qc); 2718 return; 2719 } else if (unlikely(err_mask)) { 2720 /* FIXME: not quite right; we don't want the 2721 * translation of taskfile registers into 2722 * a sense descriptors, since that's only 2723 * correct for ATA, not ATAPI 2724 */ 2725 ata_gen_passthru_sense(qc); 2726 } else { 2727 u8 *scsicmd = cmd->cmnd; 2728 2729 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2730 unsigned long flags; 2731 u8 *buf; 2732 2733 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2734 2735 /* ATAPI devices typically report zero for their SCSI version, 2736 * and sometimes deviate from the spec WRT response data 2737 * format. If SCSI version is reported as zero like normal, 2738 * then we make the following fixups: 1) Fake MMC-5 version, 2739 * to indicate to the Linux scsi midlayer this is a modern 2740 * device. 2) Ensure response data format / ATAPI information 2741 * are always correct. 2742 */ 2743 if (buf[2] == 0) { 2744 buf[2] = 0x5; 2745 buf[3] = 0x32; 2746 } 2747 2748 ata_scsi_rbuf_put(cmd, true, &flags); 2749 } 2750 2751 cmd->result = SAM_STAT_GOOD; 2752 } 2753 2754 qc->scsidone(cmd); 2755 ata_qc_free(qc); 2756 } 2757 /** 2758 * atapi_xlat - Initialize PACKET taskfile 2759 * @qc: command structure to be initialized 2760 * 2761 * LOCKING: 2762 * spin_lock_irqsave(host lock) 2763 * 2764 * RETURNS: 2765 * Zero on success, non-zero on failure. 2766 */ 2767 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2768 { 2769 struct scsi_cmnd *scmd = qc->scsicmd; 2770 struct ata_device *dev = qc->dev; 2771 int nodata = (scmd->sc_data_direction == DMA_NONE); 2772 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2773 unsigned int nbytes; 2774 2775 memset(qc->cdb, 0, dev->cdb_len); 2776 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2777 2778 qc->complete_fn = atapi_qc_complete; 2779 2780 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2781 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2782 qc->tf.flags |= ATA_TFLAG_WRITE; 2783 DPRINTK("direction: write\n"); 2784 } 2785 2786 qc->tf.command = ATA_CMD_PACKET; 2787 ata_qc_set_pc_nbytes(qc); 2788 2789 /* check whether ATAPI DMA is safe */ 2790 if (!nodata && !using_pio && atapi_check_dma(qc)) 2791 using_pio = 1; 2792 2793 /* Some controller variants snoop this value for Packet 2794 * transfers to do state machine and FIFO management. Thus we 2795 * want to set it properly, and for DMA where it is 2796 * effectively meaningless. 2797 */ 2798 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2799 2800 /* Most ATAPI devices which honor transfer chunk size don't 2801 * behave according to the spec when odd chunk size which 2802 * matches the transfer length is specified. If the number of 2803 * bytes to transfer is 2n+1. According to the spec, what 2804 * should happen is to indicate that 2n+1 is going to be 2805 * transferred and transfer 2n+2 bytes where the last byte is 2806 * padding. 2807 * 2808 * In practice, this doesn't happen. ATAPI devices first 2809 * indicate and transfer 2n bytes and then indicate and 2810 * transfer 2 bytes where the last byte is padding. 2811 * 2812 * This inconsistency confuses several controllers which 2813 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2814 * These controllers use actual number of transferred bytes to 2815 * update DMA poitner and transfer of 4n+2 bytes make those 2816 * controller push DMA pointer by 4n+4 bytes because SATA data 2817 * FISes are aligned to 4 bytes. This causes data corruption 2818 * and buffer overrun. 2819 * 2820 * Always setting nbytes to even number solves this problem 2821 * because then ATAPI devices don't have to split data at 2n 2822 * boundaries. 2823 */ 2824 if (nbytes & 0x1) 2825 nbytes++; 2826 2827 qc->tf.lbam = (nbytes & 0xFF); 2828 qc->tf.lbah = (nbytes >> 8); 2829 2830 if (nodata) 2831 qc->tf.protocol = ATAPI_PROT_NODATA; 2832 else if (using_pio) 2833 qc->tf.protocol = ATAPI_PROT_PIO; 2834 else { 2835 /* DMA data xfer */ 2836 qc->tf.protocol = ATAPI_PROT_DMA; 2837 qc->tf.feature |= ATAPI_PKT_DMA; 2838 2839 if ((dev->flags & ATA_DFLAG_DMADIR) && 2840 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2841 /* some SATA bridges need us to indicate data xfer direction */ 2842 qc->tf.feature |= ATAPI_DMADIR; 2843 } 2844 2845 2846 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2847 as ATAPI tape drives don't get this right otherwise */ 2848 return 0; 2849 } 2850 2851 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2852 { 2853 if (!sata_pmp_attached(ap)) { 2854 if (likely(devno < ata_link_max_devices(&ap->link))) 2855 return &ap->link.device[devno]; 2856 } else { 2857 if (likely(devno < ap->nr_pmp_links)) 2858 return &ap->pmp_link[devno].device[0]; 2859 } 2860 2861 return NULL; 2862 } 2863 2864 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2865 const struct scsi_device *scsidev) 2866 { 2867 int devno; 2868 2869 /* skip commands not addressed to targets we simulate */ 2870 if (!sata_pmp_attached(ap)) { 2871 if (unlikely(scsidev->channel || scsidev->lun)) 2872 return NULL; 2873 devno = scsidev->id; 2874 } else { 2875 if (unlikely(scsidev->id || scsidev->lun)) 2876 return NULL; 2877 devno = scsidev->channel; 2878 } 2879 2880 return ata_find_dev(ap, devno); 2881 } 2882 2883 /** 2884 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2885 * @ap: ATA port to which the device is attached 2886 * @scsidev: SCSI device from which we derive the ATA device 2887 * 2888 * Given various information provided in struct scsi_cmnd, 2889 * map that onto an ATA bus, and using that mapping 2890 * determine which ata_device is associated with the 2891 * SCSI command to be sent. 2892 * 2893 * LOCKING: 2894 * spin_lock_irqsave(host lock) 2895 * 2896 * RETURNS: 2897 * Associated ATA device, or %NULL if not found. 2898 */ 2899 static struct ata_device * 2900 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2901 { 2902 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2903 2904 if (unlikely(!dev || !ata_dev_enabled(dev))) 2905 return NULL; 2906 2907 return dev; 2908 } 2909 2910 /* 2911 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2912 * @byte1: Byte 1 from pass-thru CDB. 2913 * 2914 * RETURNS: 2915 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2916 */ 2917 static u8 2918 ata_scsi_map_proto(u8 byte1) 2919 { 2920 switch((byte1 & 0x1e) >> 1) { 2921 case 3: /* Non-data */ 2922 return ATA_PROT_NODATA; 2923 2924 case 6: /* DMA */ 2925 case 10: /* UDMA Data-in */ 2926 case 11: /* UDMA Data-Out */ 2927 return ATA_PROT_DMA; 2928 2929 case 4: /* PIO Data-in */ 2930 case 5: /* PIO Data-out */ 2931 return ATA_PROT_PIO; 2932 2933 case 0: /* Hard Reset */ 2934 case 1: /* SRST */ 2935 case 8: /* Device Diagnostic */ 2936 case 9: /* Device Reset */ 2937 case 7: /* DMA Queued */ 2938 case 12: /* FPDMA */ 2939 case 15: /* Return Response Info */ 2940 default: /* Reserved */ 2941 break; 2942 } 2943 2944 return ATA_PROT_UNKNOWN; 2945 } 2946 2947 /** 2948 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2949 * @qc: command structure to be initialized 2950 * 2951 * Handles either 12 or 16-byte versions of the CDB. 2952 * 2953 * RETURNS: 2954 * Zero on success, non-zero on failure. 2955 */ 2956 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2957 { 2958 struct ata_taskfile *tf = &(qc->tf); 2959 struct scsi_cmnd *scmd = qc->scsicmd; 2960 struct ata_device *dev = qc->dev; 2961 const u8 *cdb = scmd->cmnd; 2962 2963 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2964 goto invalid_fld; 2965 2966 /* 2967 * 12 and 16 byte CDBs use different offsets to 2968 * provide the various register values. 2969 */ 2970 if (cdb[0] == ATA_16) { 2971 /* 2972 * 16-byte CDB - may contain extended commands. 2973 * 2974 * If that is the case, copy the upper byte register values. 2975 */ 2976 if (cdb[1] & 0x01) { 2977 tf->hob_feature = cdb[3]; 2978 tf->hob_nsect = cdb[5]; 2979 tf->hob_lbal = cdb[7]; 2980 tf->hob_lbam = cdb[9]; 2981 tf->hob_lbah = cdb[11]; 2982 tf->flags |= ATA_TFLAG_LBA48; 2983 } else 2984 tf->flags &= ~ATA_TFLAG_LBA48; 2985 2986 /* 2987 * Always copy low byte, device and command registers. 2988 */ 2989 tf->feature = cdb[4]; 2990 tf->nsect = cdb[6]; 2991 tf->lbal = cdb[8]; 2992 tf->lbam = cdb[10]; 2993 tf->lbah = cdb[12]; 2994 tf->device = cdb[13]; 2995 tf->command = cdb[14]; 2996 } else { 2997 /* 2998 * 12-byte CDB - incapable of extended commands. 2999 */ 3000 tf->flags &= ~ATA_TFLAG_LBA48; 3001 3002 tf->feature = cdb[3]; 3003 tf->nsect = cdb[4]; 3004 tf->lbal = cdb[5]; 3005 tf->lbam = cdb[6]; 3006 tf->lbah = cdb[7]; 3007 tf->device = cdb[8]; 3008 tf->command = cdb[9]; 3009 } 3010 3011 /* enforce correct master/slave bit */ 3012 tf->device = dev->devno ? 3013 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 3014 3015 switch (tf->command) { 3016 /* READ/WRITE LONG use a non-standard sect_size */ 3017 case ATA_CMD_READ_LONG: 3018 case ATA_CMD_READ_LONG_ONCE: 3019 case ATA_CMD_WRITE_LONG: 3020 case ATA_CMD_WRITE_LONG_ONCE: 3021 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 3022 goto invalid_fld; 3023 qc->sect_size = scsi_bufflen(scmd); 3024 break; 3025 3026 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 3027 case ATA_CMD_CFA_WRITE_NE: 3028 case ATA_CMD_CFA_TRANS_SECT: 3029 case ATA_CMD_CFA_WRITE_MULT_NE: 3030 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 3031 case ATA_CMD_READ: 3032 case ATA_CMD_READ_EXT: 3033 case ATA_CMD_READ_QUEUED: 3034 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 3035 case ATA_CMD_FPDMA_READ: 3036 case ATA_CMD_READ_MULTI: 3037 case ATA_CMD_READ_MULTI_EXT: 3038 case ATA_CMD_PIO_READ: 3039 case ATA_CMD_PIO_READ_EXT: 3040 case ATA_CMD_READ_STREAM_DMA_EXT: 3041 case ATA_CMD_READ_STREAM_EXT: 3042 case ATA_CMD_VERIFY: 3043 case ATA_CMD_VERIFY_EXT: 3044 case ATA_CMD_WRITE: 3045 case ATA_CMD_WRITE_EXT: 3046 case ATA_CMD_WRITE_FUA_EXT: 3047 case ATA_CMD_WRITE_QUEUED: 3048 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 3049 case ATA_CMD_FPDMA_WRITE: 3050 case ATA_CMD_WRITE_MULTI: 3051 case ATA_CMD_WRITE_MULTI_EXT: 3052 case ATA_CMD_WRITE_MULTI_FUA_EXT: 3053 case ATA_CMD_PIO_WRITE: 3054 case ATA_CMD_PIO_WRITE_EXT: 3055 case ATA_CMD_WRITE_STREAM_DMA_EXT: 3056 case ATA_CMD_WRITE_STREAM_EXT: 3057 qc->sect_size = scmd->device->sector_size; 3058 break; 3059 3060 /* Everything else uses 512 byte "sectors" */ 3061 default: 3062 qc->sect_size = ATA_SECT_SIZE; 3063 } 3064 3065 /* 3066 * Set flags so that all registers will be written, pass on 3067 * write indication (used for PIO/DMA setup), result TF is 3068 * copied back and we don't whine too much about its failure. 3069 */ 3070 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3071 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3072 tf->flags |= ATA_TFLAG_WRITE; 3073 3074 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3075 3076 /* 3077 * Set transfer length. 3078 * 3079 * TODO: find out if we need to do more here to 3080 * cover scatter/gather case. 3081 */ 3082 ata_qc_set_pc_nbytes(qc); 3083 3084 /* We may not issue DMA commands if no DMA mode is set */ 3085 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3086 goto invalid_fld; 3087 3088 /* sanity check for pio multi commands */ 3089 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3090 goto invalid_fld; 3091 3092 if (is_multi_taskfile(tf)) { 3093 unsigned int multi_count = 1 << (cdb[1] >> 5); 3094 3095 /* compare the passed through multi_count 3096 * with the cached multi_count of libata 3097 */ 3098 if (multi_count != dev->multi_count) 3099 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3100 multi_count); 3101 } 3102 3103 /* 3104 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3105 * SET_FEATURES - XFER MODE must be preceded/succeeded 3106 * by an update to hardware-specific registers for each 3107 * controller (i.e. the reason for ->set_piomode(), 3108 * ->set_dmamode(), and ->post_set_mode() hooks). 3109 */ 3110 if (tf->command == ATA_CMD_SET_FEATURES && 3111 tf->feature == SETFEATURES_XFER) 3112 goto invalid_fld; 3113 3114 /* 3115 * Filter TPM commands by default. These provide an 3116 * essentially uncontrolled encrypted "back door" between 3117 * applications and the disk. Set libata.allow_tpm=1 if you 3118 * have a real reason for wanting to use them. This ensures 3119 * that installed software cannot easily mess stuff up without 3120 * user intent. DVR type users will probably ship with this enabled 3121 * for movie content management. 3122 * 3123 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3124 * for this and should do in future but that it is not sufficient as 3125 * DCS is an optional feature set. Thus we also do the software filter 3126 * so that we comply with the TC consortium stated goal that the user 3127 * can turn off TC features of their system. 3128 */ 3129 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3130 goto invalid_fld; 3131 3132 return 0; 3133 3134 invalid_fld: 3135 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3136 /* "Invalid field in cdb" */ 3137 return 1; 3138 } 3139 3140 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3141 { 3142 struct ata_taskfile *tf = &qc->tf; 3143 struct scsi_cmnd *scmd = qc->scsicmd; 3144 struct ata_device *dev = qc->dev; 3145 const u8 *cdb = scmd->cmnd; 3146 u64 block; 3147 u32 n_block; 3148 u32 size; 3149 void *buf; 3150 3151 /* we may not issue DMA commands if no DMA mode is set */ 3152 if (unlikely(!dev->dma_mode)) 3153 goto invalid_fld; 3154 3155 if (unlikely(scmd->cmd_len < 16)) 3156 goto invalid_fld; 3157 scsi_16_lba_len(cdb, &block, &n_block); 3158 3159 /* for now we only support WRITE SAME with the unmap bit set */ 3160 if (unlikely(!(cdb[1] & 0x8))) 3161 goto invalid_fld; 3162 3163 /* 3164 * WRITE SAME always has a sector sized buffer as payload, this 3165 * should never be a multiple entry S/G list. 3166 */ 3167 if (!scsi_sg_count(scmd)) 3168 goto invalid_fld; 3169 3170 buf = page_address(sg_page(scsi_sglist(scmd))); 3171 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3172 3173 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3174 /* Newer devices support queued TRIM commands */ 3175 tf->protocol = ATA_PROT_NCQ; 3176 tf->command = ATA_CMD_FPDMA_SEND; 3177 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3178 tf->nsect = qc->tag << 3; 3179 tf->hob_feature = (size / 512) >> 8; 3180 tf->feature = size / 512; 3181 3182 tf->auxiliary = 1; 3183 } else { 3184 tf->protocol = ATA_PROT_DMA; 3185 tf->hob_feature = 0; 3186 tf->feature = ATA_DSM_TRIM; 3187 tf->hob_nsect = (size / 512) >> 8; 3188 tf->nsect = size / 512; 3189 tf->command = ATA_CMD_DSM; 3190 } 3191 3192 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3193 ATA_TFLAG_WRITE; 3194 3195 ata_qc_set_pc_nbytes(qc); 3196 3197 return 0; 3198 3199 invalid_fld: 3200 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3201 /* "Invalid field in cdb" */ 3202 return 1; 3203 } 3204 3205 /** 3206 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3207 * @qc: Storage for translated ATA taskfile 3208 * @buf: input buffer 3209 * @len: number of valid bytes in the input buffer 3210 * 3211 * Prepare a taskfile to modify caching information for the device. 3212 * 3213 * LOCKING: 3214 * None. 3215 */ 3216 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3217 const u8 *buf, int len) 3218 { 3219 struct ata_taskfile *tf = &qc->tf; 3220 struct ata_device *dev = qc->dev; 3221 char mpage[CACHE_MPAGE_LEN]; 3222 u8 wce; 3223 3224 /* 3225 * The first two bytes of def_cache_mpage are a header, so offsets 3226 * in mpage are off by 2 compared to buf. Same for len. 3227 */ 3228 3229 if (len != CACHE_MPAGE_LEN - 2) 3230 return -EINVAL; 3231 3232 wce = buf[0] & (1 << 2); 3233 3234 /* 3235 * Check that read-only bits are not modified. 3236 */ 3237 ata_msense_caching(dev->id, mpage, false); 3238 mpage[2] &= ~(1 << 2); 3239 mpage[2] |= wce; 3240 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3241 return -EINVAL; 3242 3243 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3244 tf->protocol = ATA_PROT_NODATA; 3245 tf->nsect = 0; 3246 tf->command = ATA_CMD_SET_FEATURES; 3247 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3248 return 0; 3249 } 3250 3251 /** 3252 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3253 * @qc: Storage for translated ATA taskfile 3254 * 3255 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3256 * Assume this is invoked for direct access devices (e.g. disks) only. 3257 * There should be no block descriptor for other device types. 3258 * 3259 * LOCKING: 3260 * spin_lock_irqsave(host lock) 3261 */ 3262 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3263 { 3264 struct scsi_cmnd *scmd = qc->scsicmd; 3265 const u8 *cdb = scmd->cmnd; 3266 const u8 *p; 3267 u8 pg, spg; 3268 unsigned six_byte, pg_len, hdr_len, bd_len; 3269 int len; 3270 3271 VPRINTK("ENTER\n"); 3272 3273 six_byte = (cdb[0] == MODE_SELECT); 3274 if (six_byte) { 3275 if (scmd->cmd_len < 5) 3276 goto invalid_fld; 3277 3278 len = cdb[4]; 3279 hdr_len = 4; 3280 } else { 3281 if (scmd->cmd_len < 9) 3282 goto invalid_fld; 3283 3284 len = (cdb[7] << 8) + cdb[8]; 3285 hdr_len = 8; 3286 } 3287 3288 /* We only support PF=1, SP=0. */ 3289 if ((cdb[1] & 0x11) != 0x10) 3290 goto invalid_fld; 3291 3292 /* Test early for possible overrun. */ 3293 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3294 goto invalid_param_len; 3295 3296 p = page_address(sg_page(scsi_sglist(scmd))); 3297 3298 /* Move past header and block descriptors. */ 3299 if (len < hdr_len) 3300 goto invalid_param_len; 3301 3302 if (six_byte) 3303 bd_len = p[3]; 3304 else 3305 bd_len = (p[6] << 8) + p[7]; 3306 3307 len -= hdr_len; 3308 p += hdr_len; 3309 if (len < bd_len) 3310 goto invalid_param_len; 3311 if (bd_len != 0 && bd_len != 8) 3312 goto invalid_param; 3313 3314 len -= bd_len; 3315 p += bd_len; 3316 if (len == 0) 3317 goto skip; 3318 3319 /* Parse both possible formats for the mode page headers. */ 3320 pg = p[0] & 0x3f; 3321 if (p[0] & 0x40) { 3322 if (len < 4) 3323 goto invalid_param_len; 3324 3325 spg = p[1]; 3326 pg_len = (p[2] << 8) | p[3]; 3327 p += 4; 3328 len -= 4; 3329 } else { 3330 if (len < 2) 3331 goto invalid_param_len; 3332 3333 spg = 0; 3334 pg_len = p[1]; 3335 p += 2; 3336 len -= 2; 3337 } 3338 3339 /* 3340 * No mode subpages supported (yet) but asking for _all_ 3341 * subpages may be valid 3342 */ 3343 if (spg && (spg != ALL_SUB_MPAGES)) 3344 goto invalid_param; 3345 if (pg_len > len) 3346 goto invalid_param_len; 3347 3348 switch (pg) { 3349 case CACHE_MPAGE: 3350 if (ata_mselect_caching(qc, p, pg_len) < 0) 3351 goto invalid_param; 3352 break; 3353 3354 default: /* invalid page code */ 3355 goto invalid_param; 3356 } 3357 3358 /* 3359 * Only one page has changeable data, so we only support setting one 3360 * page at a time. 3361 */ 3362 if (len > pg_len) 3363 goto invalid_param; 3364 3365 return 0; 3366 3367 invalid_fld: 3368 /* "Invalid field in CDB" */ 3369 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3370 return 1; 3371 3372 invalid_param: 3373 /* "Invalid field in parameter list" */ 3374 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3375 return 1; 3376 3377 invalid_param_len: 3378 /* "Parameter list length error" */ 3379 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3380 return 1; 3381 3382 skip: 3383 scmd->result = SAM_STAT_GOOD; 3384 return 1; 3385 } 3386 3387 /** 3388 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3389 * @dev: ATA device 3390 * @cmd: SCSI command opcode to consider 3391 * 3392 * Look up the SCSI command given, and determine whether the 3393 * SCSI command is to be translated or simulated. 3394 * 3395 * RETURNS: 3396 * Pointer to translation function if possible, %NULL if not. 3397 */ 3398 3399 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3400 { 3401 switch (cmd) { 3402 case READ_6: 3403 case READ_10: 3404 case READ_16: 3405 3406 case WRITE_6: 3407 case WRITE_10: 3408 case WRITE_16: 3409 return ata_scsi_rw_xlat; 3410 3411 case WRITE_SAME_16: 3412 return ata_scsi_write_same_xlat; 3413 3414 case SYNCHRONIZE_CACHE: 3415 if (ata_try_flush_cache(dev)) 3416 return ata_scsi_flush_xlat; 3417 break; 3418 3419 case VERIFY: 3420 case VERIFY_16: 3421 return ata_scsi_verify_xlat; 3422 3423 case ATA_12: 3424 case ATA_16: 3425 return ata_scsi_pass_thru; 3426 3427 case MODE_SELECT: 3428 case MODE_SELECT_10: 3429 return ata_scsi_mode_select_xlat; 3430 break; 3431 3432 case START_STOP: 3433 return ata_scsi_start_stop_xlat; 3434 } 3435 3436 return NULL; 3437 } 3438 3439 /** 3440 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3441 * @ap: ATA port to which the command was being sent 3442 * @cmd: SCSI command to dump 3443 * 3444 * Prints the contents of a SCSI command via printk(). 3445 */ 3446 3447 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3448 struct scsi_cmnd *cmd) 3449 { 3450 #ifdef ATA_DEBUG 3451 struct scsi_device *scsidev = cmd->device; 3452 u8 *scsicmd = cmd->cmnd; 3453 3454 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3455 ap->print_id, 3456 scsidev->channel, scsidev->id, scsidev->lun, 3457 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3458 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3459 scsicmd[8]); 3460 #endif 3461 } 3462 3463 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3464 struct ata_device *dev) 3465 { 3466 u8 scsi_op = scmd->cmnd[0]; 3467 ata_xlat_func_t xlat_func; 3468 int rc = 0; 3469 3470 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 3471 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3472 goto bad_cdb_len; 3473 3474 xlat_func = ata_get_xlat_func(dev, scsi_op); 3475 } else { 3476 if (unlikely(!scmd->cmd_len)) 3477 goto bad_cdb_len; 3478 3479 xlat_func = NULL; 3480 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3481 /* relay SCSI command to ATAPI device */ 3482 int len = COMMAND_SIZE(scsi_op); 3483 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3484 goto bad_cdb_len; 3485 3486 xlat_func = atapi_xlat; 3487 } else { 3488 /* ATA_16 passthru, treat as an ATA command */ 3489 if (unlikely(scmd->cmd_len > 16)) 3490 goto bad_cdb_len; 3491 3492 xlat_func = ata_get_xlat_func(dev, scsi_op); 3493 } 3494 } 3495 3496 if (xlat_func) 3497 rc = ata_scsi_translate(dev, scmd, xlat_func); 3498 else 3499 ata_scsi_simulate(dev, scmd); 3500 3501 return rc; 3502 3503 bad_cdb_len: 3504 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3505 scmd->cmd_len, scsi_op, dev->cdb_len); 3506 scmd->result = DID_ERROR << 16; 3507 scmd->scsi_done(scmd); 3508 return 0; 3509 } 3510 3511 /** 3512 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3513 * @shost: SCSI host of command to be sent 3514 * @cmd: SCSI command to be sent 3515 * 3516 * In some cases, this function translates SCSI commands into 3517 * ATA taskfiles, and queues the taskfiles to be sent to 3518 * hardware. In other cases, this function simulates a 3519 * SCSI device by evaluating and responding to certain 3520 * SCSI commands. This creates the overall effect of 3521 * ATA and ATAPI devices appearing as SCSI devices. 3522 * 3523 * LOCKING: 3524 * ATA host lock 3525 * 3526 * RETURNS: 3527 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3528 * 0 otherwise. 3529 */ 3530 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3531 { 3532 struct ata_port *ap; 3533 struct ata_device *dev; 3534 struct scsi_device *scsidev = cmd->device; 3535 int rc = 0; 3536 unsigned long irq_flags; 3537 3538 ap = ata_shost_to_port(shost); 3539 3540 spin_lock_irqsave(ap->lock, irq_flags); 3541 3542 ata_scsi_dump_cdb(ap, cmd); 3543 3544 dev = ata_scsi_find_dev(ap, scsidev); 3545 if (likely(dev)) 3546 rc = __ata_scsi_queuecmd(cmd, dev); 3547 else { 3548 cmd->result = (DID_BAD_TARGET << 16); 3549 cmd->scsi_done(cmd); 3550 } 3551 3552 spin_unlock_irqrestore(ap->lock, irq_flags); 3553 3554 return rc; 3555 } 3556 3557 /** 3558 * ata_scsi_simulate - simulate SCSI command on ATA device 3559 * @dev: the target device 3560 * @cmd: SCSI command being sent to device. 3561 * 3562 * Interprets and directly executes a select list of SCSI commands 3563 * that can be handled internally. 3564 * 3565 * LOCKING: 3566 * spin_lock_irqsave(host lock) 3567 */ 3568 3569 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3570 { 3571 struct ata_scsi_args args; 3572 const u8 *scsicmd = cmd->cmnd; 3573 u8 tmp8; 3574 3575 args.dev = dev; 3576 args.id = dev->id; 3577 args.cmd = cmd; 3578 args.done = cmd->scsi_done; 3579 3580 switch(scsicmd[0]) { 3581 /* TODO: worth improving? */ 3582 case FORMAT_UNIT: 3583 ata_scsi_invalid_field(cmd); 3584 break; 3585 3586 case INQUIRY: 3587 if (scsicmd[1] & 2) /* is CmdDt set? */ 3588 ata_scsi_invalid_field(cmd); 3589 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3590 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3591 else switch (scsicmd[2]) { 3592 case 0x00: 3593 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3594 break; 3595 case 0x80: 3596 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3597 break; 3598 case 0x83: 3599 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3600 break; 3601 case 0x89: 3602 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3603 break; 3604 case 0xb0: 3605 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3606 break; 3607 case 0xb1: 3608 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3609 break; 3610 case 0xb2: 3611 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3612 break; 3613 default: 3614 ata_scsi_invalid_field(cmd); 3615 break; 3616 } 3617 break; 3618 3619 case MODE_SENSE: 3620 case MODE_SENSE_10: 3621 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3622 break; 3623 3624 case READ_CAPACITY: 3625 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3626 break; 3627 3628 case SERVICE_ACTION_IN_16: 3629 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3630 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3631 else 3632 ata_scsi_invalid_field(cmd); 3633 break; 3634 3635 case REPORT_LUNS: 3636 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3637 break; 3638 3639 case REQUEST_SENSE: 3640 ata_scsi_set_sense(cmd, 0, 0, 0); 3641 cmd->result = (DRIVER_SENSE << 24); 3642 cmd->scsi_done(cmd); 3643 break; 3644 3645 /* if we reach this, then writeback caching is disabled, 3646 * turning this into a no-op. 3647 */ 3648 case SYNCHRONIZE_CACHE: 3649 /* fall through */ 3650 3651 /* no-op's, complete with success */ 3652 case REZERO_UNIT: 3653 case SEEK_6: 3654 case SEEK_10: 3655 case TEST_UNIT_READY: 3656 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3657 break; 3658 3659 case SEND_DIAGNOSTIC: 3660 tmp8 = scsicmd[1] & ~(1 << 3); 3661 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3662 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3663 else 3664 ata_scsi_invalid_field(cmd); 3665 break; 3666 3667 /* all other commands */ 3668 default: 3669 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3670 /* "Invalid command operation code" */ 3671 cmd->scsi_done(cmd); 3672 break; 3673 } 3674 } 3675 3676 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3677 { 3678 int i, rc; 3679 3680 for (i = 0; i < host->n_ports; i++) { 3681 struct ata_port *ap = host->ports[i]; 3682 struct Scsi_Host *shost; 3683 3684 rc = -ENOMEM; 3685 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3686 if (!shost) 3687 goto err_alloc; 3688 3689 shost->eh_noresume = 1; 3690 *(struct ata_port **)&shost->hostdata[0] = ap; 3691 ap->scsi_host = shost; 3692 3693 shost->transportt = ata_scsi_transport_template; 3694 shost->unique_id = ap->print_id; 3695 shost->max_id = 16; 3696 shost->max_lun = 1; 3697 shost->max_channel = 1; 3698 shost->max_cmd_len = 16; 3699 shost->no_write_same = 1; 3700 3701 /* Schedule policy is determined by ->qc_defer() 3702 * callback and it needs to see every deferred qc. 3703 * Set host_blocked to 1 to prevent SCSI midlayer from 3704 * automatically deferring requests. 3705 */ 3706 shost->max_host_blocked = 1; 3707 3708 if (scsi_init_shared_tag_map(shost, host->n_tags)) 3709 goto err_add; 3710 3711 rc = scsi_add_host_with_dma(ap->scsi_host, 3712 &ap->tdev, ap->host->dev); 3713 if (rc) 3714 goto err_add; 3715 } 3716 3717 return 0; 3718 3719 err_add: 3720 scsi_host_put(host->ports[i]->scsi_host); 3721 err_alloc: 3722 while (--i >= 0) { 3723 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3724 3725 scsi_remove_host(shost); 3726 scsi_host_put(shost); 3727 } 3728 return rc; 3729 } 3730 3731 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3732 { 3733 int tries = 5; 3734 struct ata_device *last_failed_dev = NULL; 3735 struct ata_link *link; 3736 struct ata_device *dev; 3737 3738 repeat: 3739 ata_for_each_link(link, ap, EDGE) { 3740 ata_for_each_dev(dev, link, ENABLED) { 3741 struct scsi_device *sdev; 3742 int channel = 0, id = 0; 3743 3744 if (dev->sdev) 3745 continue; 3746 3747 if (ata_is_host_link(link)) 3748 id = dev->devno; 3749 else 3750 channel = link->pmp; 3751 3752 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3753 NULL); 3754 if (!IS_ERR(sdev)) { 3755 dev->sdev = sdev; 3756 scsi_device_put(sdev); 3757 } else { 3758 dev->sdev = NULL; 3759 } 3760 } 3761 } 3762 3763 /* If we scanned while EH was in progress or allocation 3764 * failure occurred, scan would have failed silently. Check 3765 * whether all devices are attached. 3766 */ 3767 ata_for_each_link(link, ap, EDGE) { 3768 ata_for_each_dev(dev, link, ENABLED) { 3769 if (!dev->sdev) 3770 goto exit_loop; 3771 } 3772 } 3773 exit_loop: 3774 if (!link) 3775 return; 3776 3777 /* we're missing some SCSI devices */ 3778 if (sync) { 3779 /* If caller requested synchrnous scan && we've made 3780 * any progress, sleep briefly and repeat. 3781 */ 3782 if (dev != last_failed_dev) { 3783 msleep(100); 3784 last_failed_dev = dev; 3785 goto repeat; 3786 } 3787 3788 /* We might be failing to detect boot device, give it 3789 * a few more chances. 3790 */ 3791 if (--tries) { 3792 msleep(100); 3793 goto repeat; 3794 } 3795 3796 ata_port_err(ap, 3797 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3798 } 3799 3800 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3801 round_jiffies_relative(HZ)); 3802 } 3803 3804 /** 3805 * ata_scsi_offline_dev - offline attached SCSI device 3806 * @dev: ATA device to offline attached SCSI device for 3807 * 3808 * This function is called from ata_eh_hotplug() and responsible 3809 * for taking the SCSI device attached to @dev offline. This 3810 * function is called with host lock which protects dev->sdev 3811 * against clearing. 3812 * 3813 * LOCKING: 3814 * spin_lock_irqsave(host lock) 3815 * 3816 * RETURNS: 3817 * 1 if attached SCSI device exists, 0 otherwise. 3818 */ 3819 int ata_scsi_offline_dev(struct ata_device *dev) 3820 { 3821 if (dev->sdev) { 3822 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3823 return 1; 3824 } 3825 return 0; 3826 } 3827 3828 /** 3829 * ata_scsi_remove_dev - remove attached SCSI device 3830 * @dev: ATA device to remove attached SCSI device for 3831 * 3832 * This function is called from ata_eh_scsi_hotplug() and 3833 * responsible for removing the SCSI device attached to @dev. 3834 * 3835 * LOCKING: 3836 * Kernel thread context (may sleep). 3837 */ 3838 static void ata_scsi_remove_dev(struct ata_device *dev) 3839 { 3840 struct ata_port *ap = dev->link->ap; 3841 struct scsi_device *sdev; 3842 unsigned long flags; 3843 3844 /* Alas, we need to grab scan_mutex to ensure SCSI device 3845 * state doesn't change underneath us and thus 3846 * scsi_device_get() always succeeds. The mutex locking can 3847 * be removed if there is __scsi_device_get() interface which 3848 * increments reference counts regardless of device state. 3849 */ 3850 mutex_lock(&ap->scsi_host->scan_mutex); 3851 spin_lock_irqsave(ap->lock, flags); 3852 3853 /* clearing dev->sdev is protected by host lock */ 3854 sdev = dev->sdev; 3855 dev->sdev = NULL; 3856 3857 if (sdev) { 3858 /* If user initiated unplug races with us, sdev can go 3859 * away underneath us after the host lock and 3860 * scan_mutex are released. Hold onto it. 3861 */ 3862 if (scsi_device_get(sdev) == 0) { 3863 /* The following ensures the attached sdev is 3864 * offline on return from ata_scsi_offline_dev() 3865 * regardless it wins or loses the race 3866 * against this function. 3867 */ 3868 scsi_device_set_state(sdev, SDEV_OFFLINE); 3869 } else { 3870 WARN_ON(1); 3871 sdev = NULL; 3872 } 3873 } 3874 3875 spin_unlock_irqrestore(ap->lock, flags); 3876 mutex_unlock(&ap->scsi_host->scan_mutex); 3877 3878 if (sdev) { 3879 ata_dev_info(dev, "detaching (SCSI %s)\n", 3880 dev_name(&sdev->sdev_gendev)); 3881 3882 scsi_remove_device(sdev); 3883 scsi_device_put(sdev); 3884 } 3885 } 3886 3887 static void ata_scsi_handle_link_detach(struct ata_link *link) 3888 { 3889 struct ata_port *ap = link->ap; 3890 struct ata_device *dev; 3891 3892 ata_for_each_dev(dev, link, ALL) { 3893 unsigned long flags; 3894 3895 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3896 continue; 3897 3898 spin_lock_irqsave(ap->lock, flags); 3899 dev->flags &= ~ATA_DFLAG_DETACHED; 3900 spin_unlock_irqrestore(ap->lock, flags); 3901 3902 if (zpodd_dev_enabled(dev)) 3903 zpodd_exit(dev); 3904 3905 ata_scsi_remove_dev(dev); 3906 } 3907 } 3908 3909 /** 3910 * ata_scsi_media_change_notify - send media change event 3911 * @dev: Pointer to the disk device with media change event 3912 * 3913 * Tell the block layer to send a media change notification 3914 * event. 3915 * 3916 * LOCKING: 3917 * spin_lock_irqsave(host lock) 3918 */ 3919 void ata_scsi_media_change_notify(struct ata_device *dev) 3920 { 3921 if (dev->sdev) 3922 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3923 GFP_ATOMIC); 3924 } 3925 3926 /** 3927 * ata_scsi_hotplug - SCSI part of hotplug 3928 * @work: Pointer to ATA port to perform SCSI hotplug on 3929 * 3930 * Perform SCSI part of hotplug. It's executed from a separate 3931 * workqueue after EH completes. This is necessary because SCSI 3932 * hot plugging requires working EH and hot unplugging is 3933 * synchronized with hot plugging with a mutex. 3934 * 3935 * LOCKING: 3936 * Kernel thread context (may sleep). 3937 */ 3938 void ata_scsi_hotplug(struct work_struct *work) 3939 { 3940 struct ata_port *ap = 3941 container_of(work, struct ata_port, hotplug_task.work); 3942 int i; 3943 3944 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3945 DPRINTK("ENTER/EXIT - unloading\n"); 3946 return; 3947 } 3948 3949 /* 3950 * XXX - UGLY HACK 3951 * 3952 * The block layer suspend/resume path is fundamentally broken due 3953 * to freezable kthreads and workqueue and may deadlock if a block 3954 * device gets removed while resume is in progress. I don't know 3955 * what the solution is short of removing freezable kthreads and 3956 * workqueues altogether. 3957 * 3958 * The following is an ugly hack to avoid kicking off device 3959 * removal while freezer is active. This is a joke but does avoid 3960 * this particular deadlock scenario. 3961 * 3962 * https://bugzilla.kernel.org/show_bug.cgi?id=62801 3963 * http://marc.info/?l=linux-kernel&m=138695698516487 3964 */ 3965 #ifdef CONFIG_FREEZER 3966 while (pm_freezing) 3967 msleep(10); 3968 #endif 3969 3970 DPRINTK("ENTER\n"); 3971 mutex_lock(&ap->scsi_scan_mutex); 3972 3973 /* Unplug detached devices. We cannot use link iterator here 3974 * because PMP links have to be scanned even if PMP is 3975 * currently not attached. Iterate manually. 3976 */ 3977 ata_scsi_handle_link_detach(&ap->link); 3978 if (ap->pmp_link) 3979 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3980 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3981 3982 /* scan for new ones */ 3983 ata_scsi_scan_host(ap, 0); 3984 3985 mutex_unlock(&ap->scsi_scan_mutex); 3986 DPRINTK("EXIT\n"); 3987 } 3988 3989 /** 3990 * ata_scsi_user_scan - indication for user-initiated bus scan 3991 * @shost: SCSI host to scan 3992 * @channel: Channel to scan 3993 * @id: ID to scan 3994 * @lun: LUN to scan 3995 * 3996 * This function is called when user explicitly requests bus 3997 * scan. Set probe pending flag and invoke EH. 3998 * 3999 * LOCKING: 4000 * SCSI layer (we don't care) 4001 * 4002 * RETURNS: 4003 * Zero. 4004 */ 4005 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 4006 unsigned int id, u64 lun) 4007 { 4008 struct ata_port *ap = ata_shost_to_port(shost); 4009 unsigned long flags; 4010 int devno, rc = 0; 4011 4012 if (!ap->ops->error_handler) 4013 return -EOPNOTSUPP; 4014 4015 if (lun != SCAN_WILD_CARD && lun) 4016 return -EINVAL; 4017 4018 if (!sata_pmp_attached(ap)) { 4019 if (channel != SCAN_WILD_CARD && channel) 4020 return -EINVAL; 4021 devno = id; 4022 } else { 4023 if (id != SCAN_WILD_CARD && id) 4024 return -EINVAL; 4025 devno = channel; 4026 } 4027 4028 spin_lock_irqsave(ap->lock, flags); 4029 4030 if (devno == SCAN_WILD_CARD) { 4031 struct ata_link *link; 4032 4033 ata_for_each_link(link, ap, EDGE) { 4034 struct ata_eh_info *ehi = &link->eh_info; 4035 ehi->probe_mask |= ATA_ALL_DEVICES; 4036 ehi->action |= ATA_EH_RESET; 4037 } 4038 } else { 4039 struct ata_device *dev = ata_find_dev(ap, devno); 4040 4041 if (dev) { 4042 struct ata_eh_info *ehi = &dev->link->eh_info; 4043 ehi->probe_mask |= 1 << dev->devno; 4044 ehi->action |= ATA_EH_RESET; 4045 } else 4046 rc = -EINVAL; 4047 } 4048 4049 if (rc == 0) { 4050 ata_port_schedule_eh(ap); 4051 spin_unlock_irqrestore(ap->lock, flags); 4052 ata_port_wait_eh(ap); 4053 } else 4054 spin_unlock_irqrestore(ap->lock, flags); 4055 4056 return rc; 4057 } 4058 4059 /** 4060 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4061 * @work: Pointer to ATA port to perform scsi_rescan_device() 4062 * 4063 * After ATA pass thru (SAT) commands are executed successfully, 4064 * libata need to propagate the changes to SCSI layer. 4065 * 4066 * LOCKING: 4067 * Kernel thread context (may sleep). 4068 */ 4069 void ata_scsi_dev_rescan(struct work_struct *work) 4070 { 4071 struct ata_port *ap = 4072 container_of(work, struct ata_port, scsi_rescan_task); 4073 struct ata_link *link; 4074 struct ata_device *dev; 4075 unsigned long flags; 4076 4077 mutex_lock(&ap->scsi_scan_mutex); 4078 spin_lock_irqsave(ap->lock, flags); 4079 4080 ata_for_each_link(link, ap, EDGE) { 4081 ata_for_each_dev(dev, link, ENABLED) { 4082 struct scsi_device *sdev = dev->sdev; 4083 4084 if (!sdev) 4085 continue; 4086 if (scsi_device_get(sdev)) 4087 continue; 4088 4089 spin_unlock_irqrestore(ap->lock, flags); 4090 scsi_rescan_device(&(sdev->sdev_gendev)); 4091 scsi_device_put(sdev); 4092 spin_lock_irqsave(ap->lock, flags); 4093 } 4094 } 4095 4096 spin_unlock_irqrestore(ap->lock, flags); 4097 mutex_unlock(&ap->scsi_scan_mutex); 4098 } 4099 4100 /** 4101 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4102 * @host: ATA host container for all SAS ports 4103 * @port_info: Information from low-level host driver 4104 * @shost: SCSI host that the scsi device is attached to 4105 * 4106 * LOCKING: 4107 * PCI/etc. bus probe sem. 4108 * 4109 * RETURNS: 4110 * ata_port pointer on success / NULL on failure. 4111 */ 4112 4113 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4114 struct ata_port_info *port_info, 4115 struct Scsi_Host *shost) 4116 { 4117 struct ata_port *ap; 4118 4119 ap = ata_port_alloc(host); 4120 if (!ap) 4121 return NULL; 4122 4123 ap->port_no = 0; 4124 ap->lock = &host->lock; 4125 ap->pio_mask = port_info->pio_mask; 4126 ap->mwdma_mask = port_info->mwdma_mask; 4127 ap->udma_mask = port_info->udma_mask; 4128 ap->flags |= port_info->flags; 4129 ap->ops = port_info->port_ops; 4130 ap->cbl = ATA_CBL_SATA; 4131 4132 return ap; 4133 } 4134 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4135 4136 /** 4137 * ata_sas_port_start - Set port up for dma. 4138 * @ap: Port to initialize 4139 * 4140 * Called just after data structures for each port are 4141 * initialized. 4142 * 4143 * May be used as the port_start() entry in ata_port_operations. 4144 * 4145 * LOCKING: 4146 * Inherited from caller. 4147 */ 4148 int ata_sas_port_start(struct ata_port *ap) 4149 { 4150 /* 4151 * the port is marked as frozen at allocation time, but if we don't 4152 * have new eh, we won't thaw it 4153 */ 4154 if (!ap->ops->error_handler) 4155 ap->pflags &= ~ATA_PFLAG_FROZEN; 4156 return 0; 4157 } 4158 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4159 4160 /** 4161 * ata_port_stop - Undo ata_sas_port_start() 4162 * @ap: Port to shut down 4163 * 4164 * May be used as the port_stop() entry in ata_port_operations. 4165 * 4166 * LOCKING: 4167 * Inherited from caller. 4168 */ 4169 4170 void ata_sas_port_stop(struct ata_port *ap) 4171 { 4172 } 4173 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4174 4175 /** 4176 * ata_sas_async_probe - simply schedule probing and return 4177 * @ap: Port to probe 4178 * 4179 * For batch scheduling of probe for sas attached ata devices, assumes 4180 * the port has already been through ata_sas_port_init() 4181 */ 4182 void ata_sas_async_probe(struct ata_port *ap) 4183 { 4184 __ata_port_probe(ap); 4185 } 4186 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4187 4188 int ata_sas_sync_probe(struct ata_port *ap) 4189 { 4190 return ata_port_probe(ap); 4191 } 4192 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4193 4194 4195 /** 4196 * ata_sas_port_init - Initialize a SATA device 4197 * @ap: SATA port to initialize 4198 * 4199 * LOCKING: 4200 * PCI/etc. bus probe sem. 4201 * 4202 * RETURNS: 4203 * Zero on success, non-zero on error. 4204 */ 4205 4206 int ata_sas_port_init(struct ata_port *ap) 4207 { 4208 int rc = ap->ops->port_start(ap); 4209 4210 if (rc) 4211 return rc; 4212 ap->print_id = atomic_inc_return(&ata_print_id); 4213 return 0; 4214 } 4215 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4216 4217 /** 4218 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4219 * @ap: SATA port to destroy 4220 * 4221 */ 4222 4223 void ata_sas_port_destroy(struct ata_port *ap) 4224 { 4225 if (ap->ops->port_stop) 4226 ap->ops->port_stop(ap); 4227 kfree(ap); 4228 } 4229 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4230 4231 /** 4232 * ata_sas_slave_configure - Default slave_config routine for libata devices 4233 * @sdev: SCSI device to configure 4234 * @ap: ATA port to which SCSI device is attached 4235 * 4236 * RETURNS: 4237 * Zero. 4238 */ 4239 4240 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4241 { 4242 ata_scsi_sdev_config(sdev); 4243 ata_scsi_dev_config(sdev, ap->link.device); 4244 return 0; 4245 } 4246 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4247 4248 /** 4249 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4250 * @cmd: SCSI command to be sent 4251 * @ap: ATA port to which the command is being sent 4252 * 4253 * RETURNS: 4254 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4255 * 0 otherwise. 4256 */ 4257 4258 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4259 { 4260 int rc = 0; 4261 4262 ata_scsi_dump_cdb(ap, cmd); 4263 4264 if (likely(ata_dev_enabled(ap->link.device))) 4265 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4266 else { 4267 cmd->result = (DID_BAD_TARGET << 16); 4268 cmd->scsi_done(cmd); 4269 } 4270 return rc; 4271 } 4272 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4273 4274 int ata_sas_allocate_tag(struct ata_port *ap) 4275 { 4276 unsigned int max_queue = ap->host->n_tags; 4277 unsigned int i, tag; 4278 4279 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { 4280 tag = tag < max_queue ? tag : 0; 4281 4282 /* the last tag is reserved for internal command. */ 4283 if (tag == ATA_TAG_INTERNAL) 4284 continue; 4285 4286 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { 4287 ap->sas_last_tag = tag; 4288 return tag; 4289 } 4290 } 4291 return -1; 4292 } 4293 4294 void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) 4295 { 4296 clear_bit(tag, &ap->sas_tag_allocated); 4297 } 4298