1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 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/kernel.h> 37 #include <linux/blkdev.h> 38 #include <linux/spinlock.h> 39 #include <scsi/scsi.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_cmnd.h> 42 #include <scsi/scsi_eh.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_tcq.h> 45 #include <scsi/scsi_transport.h> 46 #include <linux/libata.h> 47 #include <linux/hdreg.h> 48 #include <linux/uaccess.h> 49 #include <linux/suspend.h> 50 #include <asm/unaligned.h> 51 52 #include "libata.h" 53 54 #define SECTOR_SIZE 512 55 #define ATA_SCSI_RBUF_SIZE 4096 56 57 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 58 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 59 60 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 61 62 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 63 const struct scsi_device *scsidev); 64 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 67 unsigned int id, unsigned int lun); 68 69 70 #define RW_RECOVERY_MPAGE 0x1 71 #define RW_RECOVERY_MPAGE_LEN 12 72 #define CACHE_MPAGE 0x8 73 #define CACHE_MPAGE_LEN 20 74 #define CONTROL_MPAGE 0xa 75 #define CONTROL_MPAGE_LEN 12 76 #define ALL_MPAGES 0x3f 77 #define ALL_SUB_MPAGES 0xff 78 79 80 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 81 RW_RECOVERY_MPAGE, 82 RW_RECOVERY_MPAGE_LEN - 2, 83 (1 << 7), /* AWRE */ 84 0, /* read retry count */ 85 0, 0, 0, 0, 86 0, /* write retry count */ 87 0, 0, 0 88 }; 89 90 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 91 CACHE_MPAGE, 92 CACHE_MPAGE_LEN - 2, 93 0, /* contains WCE, needs to be 0 for logic */ 94 0, 0, 0, 0, 0, 0, 0, 0, 0, 95 0, /* contains DRA, needs to be 0 for logic */ 96 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 100 CONTROL_MPAGE, 101 CONTROL_MPAGE_LEN - 2, 102 2, /* DSENSE=0, GLTSD=1 */ 103 0, /* [QAM+QERR may be 1, see 05-359r1] */ 104 0, 0, 0, 0, 0xff, 0xff, 105 0, 30 /* extended self test time, see 05-359r1 */ 106 }; 107 108 /* 109 * libata transport template. libata doesn't do real transport stuff. 110 * It just needs the eh_timed_out hook. 111 */ 112 static struct scsi_transport_template ata_scsi_transport_template = { 113 .eh_strategy_handler = ata_scsi_error, 114 .eh_timed_out = ata_scsi_timed_out, 115 .user_scan = ata_scsi_user_scan, 116 }; 117 118 119 static const struct { 120 enum link_pm value; 121 const char *name; 122 } link_pm_policy[] = { 123 { NOT_AVAILABLE, "max_performance" }, 124 { MIN_POWER, "min_power" }, 125 { MAX_PERFORMANCE, "max_performance" }, 126 { MEDIUM_POWER, "medium_power" }, 127 }; 128 129 static const char *ata_scsi_lpm_get(enum link_pm policy) 130 { 131 int i; 132 133 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++) 134 if (link_pm_policy[i].value == policy) 135 return link_pm_policy[i].name; 136 137 return NULL; 138 } 139 140 static ssize_t ata_scsi_lpm_put(struct device *dev, 141 struct device_attribute *attr, 142 const char *buf, size_t count) 143 { 144 struct Scsi_Host *shost = class_to_shost(dev); 145 struct ata_port *ap = ata_shost_to_port(shost); 146 enum link_pm policy = 0; 147 int i; 148 149 /* 150 * we are skipping array location 0 on purpose - this 151 * is because a value of NOT_AVAILABLE is displayed 152 * to the user as max_performance, but when the user 153 * writes "max_performance", they actually want the 154 * value to match MAX_PERFORMANCE. 155 */ 156 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) { 157 const int len = strlen(link_pm_policy[i].name); 158 if (strncmp(link_pm_policy[i].name, buf, len) == 0) { 159 policy = link_pm_policy[i].value; 160 break; 161 } 162 } 163 if (!policy) 164 return -EINVAL; 165 166 ata_lpm_schedule(ap, policy); 167 return count; 168 } 169 170 static ssize_t 171 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf) 172 { 173 struct Scsi_Host *shost = class_to_shost(dev); 174 struct ata_port *ap = ata_shost_to_port(shost); 175 const char *policy = 176 ata_scsi_lpm_get(ap->pm_policy); 177 178 if (!policy) 179 return -EINVAL; 180 181 return snprintf(buf, 23, "%s\n", policy); 182 } 183 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 184 ata_scsi_lpm_show, ata_scsi_lpm_put); 185 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 186 187 static ssize_t ata_scsi_park_show(struct device *device, 188 struct device_attribute *attr, char *buf) 189 { 190 struct scsi_device *sdev = to_scsi_device(device); 191 struct ata_port *ap; 192 struct ata_link *link; 193 struct ata_device *dev; 194 unsigned long flags, now; 195 unsigned int uninitialized_var(msecs); 196 int rc = 0; 197 198 ap = ata_shost_to_port(sdev->host); 199 200 spin_lock_irqsave(ap->lock, flags); 201 dev = ata_scsi_find_dev(ap, sdev); 202 if (!dev) { 203 rc = -ENODEV; 204 goto unlock; 205 } 206 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 207 rc = -EOPNOTSUPP; 208 goto unlock; 209 } 210 211 link = dev->link; 212 now = jiffies; 213 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 214 link->eh_context.unloaded_mask & (1 << dev->devno) && 215 time_after(dev->unpark_deadline, now)) 216 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 217 else 218 msecs = 0; 219 220 unlock: 221 spin_unlock_irq(ap->lock); 222 223 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 224 } 225 226 static ssize_t ata_scsi_park_store(struct device *device, 227 struct device_attribute *attr, 228 const char *buf, size_t len) 229 { 230 struct scsi_device *sdev = to_scsi_device(device); 231 struct ata_port *ap; 232 struct ata_device *dev; 233 long int input; 234 unsigned long flags; 235 int rc; 236 237 rc = strict_strtol(buf, 10, &input); 238 if (rc || input < -2) 239 return -EINVAL; 240 if (input > ATA_TMOUT_MAX_PARK) { 241 rc = -EOVERFLOW; 242 input = ATA_TMOUT_MAX_PARK; 243 } 244 245 ap = ata_shost_to_port(sdev->host); 246 247 spin_lock_irqsave(ap->lock, flags); 248 dev = ata_scsi_find_dev(ap, sdev); 249 if (unlikely(!dev)) { 250 rc = -ENODEV; 251 goto unlock; 252 } 253 if (dev->class != ATA_DEV_ATA) { 254 rc = -EOPNOTSUPP; 255 goto unlock; 256 } 257 258 if (input >= 0) { 259 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 260 rc = -EOPNOTSUPP; 261 goto unlock; 262 } 263 264 dev->unpark_deadline = ata_deadline(jiffies, input); 265 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 266 ata_port_schedule_eh(ap); 267 complete(&ap->park_req_pending); 268 } else { 269 switch (input) { 270 case -1: 271 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 272 break; 273 case -2: 274 dev->flags |= ATA_DFLAG_NO_UNLOAD; 275 break; 276 } 277 } 278 unlock: 279 spin_unlock_irqrestore(ap->lock, flags); 280 281 return rc ? rc : len; 282 } 283 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 284 ata_scsi_park_show, ata_scsi_park_store); 285 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 286 287 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 288 { 289 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 290 291 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 292 } 293 294 static ssize_t 295 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 296 const char *buf, size_t count) 297 { 298 struct Scsi_Host *shost = class_to_shost(dev); 299 struct ata_port *ap = ata_shost_to_port(shost); 300 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 301 return ap->ops->em_store(ap, buf, count); 302 return -EINVAL; 303 } 304 305 static ssize_t 306 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 307 char *buf) 308 { 309 struct Scsi_Host *shost = class_to_shost(dev); 310 struct ata_port *ap = ata_shost_to_port(shost); 311 312 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 313 return ap->ops->em_show(ap, buf); 314 return -EINVAL; 315 } 316 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 317 ata_scsi_em_message_show, ata_scsi_em_message_store); 318 EXPORT_SYMBOL_GPL(dev_attr_em_message); 319 320 static ssize_t 321 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 322 char *buf) 323 { 324 struct Scsi_Host *shost = class_to_shost(dev); 325 struct ata_port *ap = ata_shost_to_port(shost); 326 327 return snprintf(buf, 23, "%d\n", ap->em_message_type); 328 } 329 DEVICE_ATTR(em_message_type, S_IRUGO, 330 ata_scsi_em_message_type_show, NULL); 331 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 332 333 static ssize_t 334 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 341 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY)) 342 return ap->ops->sw_activity_show(atadev, buf); 343 return -EINVAL; 344 } 345 346 static ssize_t 347 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 348 const char *buf, size_t count) 349 { 350 struct scsi_device *sdev = to_scsi_device(dev); 351 struct ata_port *ap = ata_shost_to_port(sdev->host); 352 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 353 enum sw_activity val; 354 int rc; 355 356 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 357 val = simple_strtoul(buf, NULL, 0); 358 switch (val) { 359 case OFF: case BLINK_ON: case BLINK_OFF: 360 rc = ap->ops->sw_activity_store(atadev, val); 361 if (!rc) 362 return count; 363 else 364 return rc; 365 } 366 } 367 return -EINVAL; 368 } 369 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 370 ata_scsi_activity_store); 371 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 372 373 struct device_attribute *ata_common_sdev_attrs[] = { 374 &dev_attr_unload_heads, 375 NULL 376 }; 377 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 378 379 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 380 void (*done)(struct scsi_cmnd *)) 381 { 382 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 383 /* "Invalid field in cbd" */ 384 done(cmd); 385 } 386 387 /** 388 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 389 * @sdev: SCSI device for which BIOS geometry is to be determined 390 * @bdev: block device associated with @sdev 391 * @capacity: capacity of SCSI device 392 * @geom: location to which geometry will be output 393 * 394 * Generic bios head/sector/cylinder calculator 395 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 396 * mapping. Some situations may arise where the disk is not 397 * bootable if this is not used. 398 * 399 * LOCKING: 400 * Defined by the SCSI layer. We don't really care. 401 * 402 * RETURNS: 403 * Zero. 404 */ 405 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 406 sector_t capacity, int geom[]) 407 { 408 geom[0] = 255; 409 geom[1] = 63; 410 sector_div(capacity, 255*63); 411 geom[2] = capacity; 412 413 return 0; 414 } 415 416 /** 417 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 418 * @ap: target port 419 * @sdev: SCSI device to get identify data for 420 * @arg: User buffer area for identify data 421 * 422 * LOCKING: 423 * Defined by the SCSI layer. We don't really care. 424 * 425 * RETURNS: 426 * Zero on success, negative errno on error. 427 */ 428 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 429 void __user *arg) 430 { 431 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 432 u16 __user *dst = arg; 433 char buf[40]; 434 435 if (!dev) 436 return -ENOMSG; 437 438 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 439 return -EFAULT; 440 441 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 442 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 443 return -EFAULT; 444 445 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 446 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 447 return -EFAULT; 448 449 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 450 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 451 return -EFAULT; 452 453 return 0; 454 } 455 456 /** 457 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 458 * @scsidev: Device to which we are issuing command 459 * @arg: User provided data for issuing command 460 * 461 * LOCKING: 462 * Defined by the SCSI layer. We don't really care. 463 * 464 * RETURNS: 465 * Zero on success, negative errno on error. 466 */ 467 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 468 { 469 int rc = 0; 470 u8 scsi_cmd[MAX_COMMAND_SIZE]; 471 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 472 int argsize = 0; 473 enum dma_data_direction data_dir; 474 int cmd_result; 475 476 if (arg == NULL) 477 return -EINVAL; 478 479 if (copy_from_user(args, arg, sizeof(args))) 480 return -EFAULT; 481 482 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 483 if (!sensebuf) 484 return -ENOMEM; 485 486 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 487 488 if (args[3]) { 489 argsize = SECTOR_SIZE * args[3]; 490 argbuf = kmalloc(argsize, GFP_KERNEL); 491 if (argbuf == NULL) { 492 rc = -ENOMEM; 493 goto error; 494 } 495 496 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 497 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 498 block count in sector count field */ 499 data_dir = DMA_FROM_DEVICE; 500 } else { 501 scsi_cmd[1] = (3 << 1); /* Non-data */ 502 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 503 data_dir = DMA_NONE; 504 } 505 506 scsi_cmd[0] = ATA_16; 507 508 scsi_cmd[4] = args[2]; 509 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 510 scsi_cmd[6] = args[3]; 511 scsi_cmd[8] = args[1]; 512 scsi_cmd[10] = 0x4f; 513 scsi_cmd[12] = 0xc2; 514 } else { 515 scsi_cmd[6] = args[1]; 516 } 517 scsi_cmd[14] = args[0]; 518 519 /* Good values for timeout and retries? Values below 520 from scsi_ioctl_send_command() for default case... */ 521 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 522 sensebuf, (10*HZ), 5, 0, NULL); 523 524 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 525 u8 *desc = sensebuf + 8; 526 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 527 528 /* If we set cc then ATA pass-through will cause a 529 * check condition even if no error. Filter that. */ 530 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 531 struct scsi_sense_hdr sshdr; 532 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 533 &sshdr); 534 if (sshdr.sense_key == 0 && 535 sshdr.asc == 0 && sshdr.ascq == 0) 536 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 537 } 538 539 /* Send userspace a few ATA registers (same as drivers/ide) */ 540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 541 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 542 args[0] = desc[13]; /* status */ 543 args[1] = desc[3]; /* error */ 544 args[2] = desc[5]; /* sector count (0:7) */ 545 if (copy_to_user(arg, args, sizeof(args))) 546 rc = -EFAULT; 547 } 548 } 549 550 551 if (cmd_result) { 552 rc = -EIO; 553 goto error; 554 } 555 556 if ((argbuf) 557 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 558 rc = -EFAULT; 559 error: 560 kfree(sensebuf); 561 kfree(argbuf); 562 return rc; 563 } 564 565 /** 566 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 567 * @scsidev: Device to which we are issuing command 568 * @arg: User provided data for issuing command 569 * 570 * LOCKING: 571 * Defined by the SCSI layer. We don't really care. 572 * 573 * RETURNS: 574 * Zero on success, negative errno on error. 575 */ 576 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 577 { 578 int rc = 0; 579 u8 scsi_cmd[MAX_COMMAND_SIZE]; 580 u8 args[7], *sensebuf = NULL; 581 int cmd_result; 582 583 if (arg == NULL) 584 return -EINVAL; 585 586 if (copy_from_user(args, arg, sizeof(args))) 587 return -EFAULT; 588 589 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 590 if (!sensebuf) 591 return -ENOMEM; 592 593 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 594 scsi_cmd[0] = ATA_16; 595 scsi_cmd[1] = (3 << 1); /* Non-data */ 596 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 597 scsi_cmd[4] = args[1]; 598 scsi_cmd[6] = args[2]; 599 scsi_cmd[8] = args[3]; 600 scsi_cmd[10] = args[4]; 601 scsi_cmd[12] = args[5]; 602 scsi_cmd[13] = args[6] & 0x4f; 603 scsi_cmd[14] = args[0]; 604 605 /* Good values for timeout and retries? Values below 606 from scsi_ioctl_send_command() for default case... */ 607 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 608 sensebuf, (10*HZ), 5, 0, NULL); 609 610 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 611 u8 *desc = sensebuf + 8; 612 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 613 614 /* If we set cc then ATA pass-through will cause a 615 * check condition even if no error. Filter that. */ 616 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 617 struct scsi_sense_hdr sshdr; 618 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 619 &sshdr); 620 if (sshdr.sense_key == 0 && 621 sshdr.asc == 0 && sshdr.ascq == 0) 622 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 623 } 624 625 /* Send userspace ATA registers */ 626 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 627 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 628 args[0] = desc[13]; /* status */ 629 args[1] = desc[3]; /* error */ 630 args[2] = desc[5]; /* sector count (0:7) */ 631 args[3] = desc[7]; /* lbal */ 632 args[4] = desc[9]; /* lbam */ 633 args[5] = desc[11]; /* lbah */ 634 args[6] = desc[12]; /* select */ 635 if (copy_to_user(arg, args, sizeof(args))) 636 rc = -EFAULT; 637 } 638 } 639 640 if (cmd_result) { 641 rc = -EIO; 642 goto error; 643 } 644 645 error: 646 kfree(sensebuf); 647 return rc; 648 } 649 650 static int ata_ioc32(struct ata_port *ap) 651 { 652 if (ap->flags & ATA_FLAG_PIO_DMA) 653 return 1; 654 if (ap->pflags & ATA_PFLAG_PIO32) 655 return 1; 656 return 0; 657 } 658 659 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 660 int cmd, void __user *arg) 661 { 662 int val = -EINVAL, rc = -EINVAL; 663 unsigned long flags; 664 665 switch (cmd) { 666 case ATA_IOC_GET_IO32: 667 spin_lock_irqsave(ap->lock, flags); 668 val = ata_ioc32(ap); 669 spin_unlock_irqrestore(ap->lock, flags); 670 if (copy_to_user(arg, &val, 1)) 671 return -EFAULT; 672 return 0; 673 674 case ATA_IOC_SET_IO32: 675 val = (unsigned long) arg; 676 rc = 0; 677 spin_lock_irqsave(ap->lock, flags); 678 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 679 if (val) 680 ap->pflags |= ATA_PFLAG_PIO32; 681 else 682 ap->pflags &= ~ATA_PFLAG_PIO32; 683 } else { 684 if (val != ata_ioc32(ap)) 685 rc = -EINVAL; 686 } 687 spin_unlock_irqrestore(ap->lock, flags); 688 return rc; 689 690 case HDIO_GET_IDENTITY: 691 return ata_get_identity(ap, scsidev, arg); 692 693 case HDIO_DRIVE_CMD: 694 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 695 return -EACCES; 696 return ata_cmd_ioctl(scsidev, arg); 697 698 case HDIO_DRIVE_TASK: 699 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 700 return -EACCES; 701 return ata_task_ioctl(scsidev, arg); 702 703 default: 704 rc = -ENOTTY; 705 break; 706 } 707 708 return rc; 709 } 710 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 711 712 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 713 { 714 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 715 scsidev, cmd, arg); 716 } 717 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 718 719 /** 720 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 721 * @dev: ATA device to which the new command is attached 722 * @cmd: SCSI command that originated this ATA command 723 * @done: SCSI command completion function 724 * 725 * Obtain a reference to an unused ata_queued_cmd structure, 726 * which is the basic libata structure representing a single 727 * ATA command sent to the hardware. 728 * 729 * If a command was available, fill in the SCSI-specific 730 * portions of the structure with information on the 731 * current command. 732 * 733 * LOCKING: 734 * spin_lock_irqsave(host lock) 735 * 736 * RETURNS: 737 * Command allocated, or %NULL if none available. 738 */ 739 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 740 struct scsi_cmnd *cmd, 741 void (*done)(struct scsi_cmnd *)) 742 { 743 struct ata_queued_cmd *qc; 744 745 qc = ata_qc_new_init(dev); 746 if (qc) { 747 qc->scsicmd = cmd; 748 qc->scsidone = done; 749 750 qc->sg = scsi_sglist(cmd); 751 qc->n_elem = scsi_sg_count(cmd); 752 } else { 753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 754 done(cmd); 755 } 756 757 return qc; 758 } 759 760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 761 { 762 struct scsi_cmnd *scmd = qc->scsicmd; 763 764 qc->extrabytes = scmd->request->extra_len; 765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 766 } 767 768 /** 769 * ata_dump_status - user friendly display of error info 770 * @id: id of the port in question 771 * @tf: ptr to filled out taskfile 772 * 773 * Decode and dump the ATA error/status registers for the user so 774 * that they have some idea what really happened at the non 775 * make-believe layer. 776 * 777 * LOCKING: 778 * inherited from caller 779 */ 780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 781 { 782 u8 stat = tf->command, err = tf->feature; 783 784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 785 if (stat & ATA_BUSY) { 786 printk("Busy }\n"); /* Data is not valid in this case */ 787 } else { 788 if (stat & 0x40) printk("DriveReady "); 789 if (stat & 0x20) printk("DeviceFault "); 790 if (stat & 0x10) printk("SeekComplete "); 791 if (stat & 0x08) printk("DataRequest "); 792 if (stat & 0x04) printk("CorrectedError "); 793 if (stat & 0x02) printk("Index "); 794 if (stat & 0x01) printk("Error "); 795 printk("}\n"); 796 797 if (err) { 798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 799 if (err & 0x04) printk("DriveStatusError "); 800 if (err & 0x80) { 801 if (err & 0x04) printk("BadCRC "); 802 else printk("Sector "); 803 } 804 if (err & 0x40) printk("UncorrectableError "); 805 if (err & 0x10) printk("SectorIdNotFound "); 806 if (err & 0x02) printk("TrackZeroNotFound "); 807 if (err & 0x01) printk("AddrMarkNotFound "); 808 printk("}\n"); 809 } 810 } 811 } 812 813 /** 814 * ata_to_sense_error - convert ATA error to SCSI error 815 * @id: ATA device number 816 * @drv_stat: value contained in ATA status register 817 * @drv_err: value contained in ATA error register 818 * @sk: the sense key we'll fill out 819 * @asc: the additional sense code we'll fill out 820 * @ascq: the additional sense code qualifier we'll fill out 821 * @verbose: be verbose 822 * 823 * Converts an ATA error into a SCSI error. Fill out pointers to 824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 825 * format sense blocks. 826 * 827 * LOCKING: 828 * spin_lock_irqsave(host lock) 829 */ 830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 831 u8 *asc, u8 *ascq, int verbose) 832 { 833 int i; 834 835 /* Based on the 3ware driver translation table */ 836 static const unsigned char sense_table[][4] = { 837 /* BBD|ECC|ID|MAR */ 838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 839 /* BBD|ECC|ID */ 840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 841 /* ECC|MC|MARK */ 842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 845 /* MC|ID|ABRT|TRK0|MARK */ 846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 847 /* MCR|MARK */ 848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 849 /* Bad address mark */ 850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 851 /* TRK0 */ 852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 853 /* Abort & !ICRC */ 854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 855 /* Media change request */ 856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 857 /* SRV */ 858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 859 /* Media change */ 860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 861 /* ECC */ 862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 863 /* BBD - block marked bad */ 864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 866 }; 867 static const unsigned char stat_table[][4] = { 868 /* Must be first because BUSY means no other bits valid */ 869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 870 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 874 }; 875 876 /* 877 * Is this an error we can process/parse 878 */ 879 if (drv_stat & ATA_BUSY) { 880 drv_err = 0; /* Ignore the err bits, they're invalid */ 881 } 882 883 if (drv_err) { 884 /* Look for drv_err */ 885 for (i = 0; sense_table[i][0] != 0xFF; i++) { 886 /* Look for best matches first */ 887 if ((sense_table[i][0] & drv_err) == 888 sense_table[i][0]) { 889 *sk = sense_table[i][1]; 890 *asc = sense_table[i][2]; 891 *ascq = sense_table[i][3]; 892 goto translate_done; 893 } 894 } 895 /* No immediate match */ 896 if (verbose) 897 printk(KERN_WARNING "ata%u: no sense translation for " 898 "error 0x%02x\n", id, drv_err); 899 } 900 901 /* Fall back to interpreting status bits */ 902 for (i = 0; stat_table[i][0] != 0xFF; i++) { 903 if (stat_table[i][0] & drv_stat) { 904 *sk = stat_table[i][1]; 905 *asc = stat_table[i][2]; 906 *ascq = stat_table[i][3]; 907 goto translate_done; 908 } 909 } 910 /* No error? Undecoded? */ 911 if (verbose) 912 printk(KERN_WARNING "ata%u: no sense translation for " 913 "status: 0x%02x\n", id, drv_stat); 914 915 /* We need a sensible error return here, which is tricky, and one 916 that won't cause people to do things like return a disk wrongly */ 917 *sk = ABORTED_COMMAND; 918 *asc = 0x00; 919 *ascq = 0x00; 920 921 translate_done: 922 if (verbose) 923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 925 id, drv_stat, drv_err, *sk, *asc, *ascq); 926 return; 927 } 928 929 /* 930 * ata_gen_passthru_sense - Generate check condition sense block. 931 * @qc: Command that completed. 932 * 933 * This function is specific to the ATA descriptor format sense 934 * block specified for the ATA pass through commands. Regardless 935 * of whether the command errored or not, return a sense 936 * block. Copy all controller registers into the sense 937 * block. Clear sense key, ASC & ASCQ if there is no error. 938 * 939 * LOCKING: 940 * None. 941 */ 942 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 943 { 944 struct scsi_cmnd *cmd = qc->scsicmd; 945 struct ata_taskfile *tf = &qc->result_tf; 946 unsigned char *sb = cmd->sense_buffer; 947 unsigned char *desc = sb + 8; 948 int verbose = qc->ap->ops->error_handler == NULL; 949 950 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 951 952 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 953 954 /* 955 * Use ata_to_sense_error() to map status register bits 956 * onto sense key, asc & ascq. 957 */ 958 if (qc->err_mask || 959 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 960 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 961 &sb[1], &sb[2], &sb[3], verbose); 962 sb[1] &= 0x0f; 963 } 964 965 /* 966 * Sense data is current and format is descriptor. 967 */ 968 sb[0] = 0x72; 969 970 desc[0] = 0x09; 971 972 /* set length of additional sense data */ 973 sb[7] = 14; 974 desc[1] = 12; 975 976 /* 977 * Copy registers into sense buffer. 978 */ 979 desc[2] = 0x00; 980 desc[3] = tf->feature; /* == error reg */ 981 desc[5] = tf->nsect; 982 desc[7] = tf->lbal; 983 desc[9] = tf->lbam; 984 desc[11] = tf->lbah; 985 desc[12] = tf->device; 986 desc[13] = tf->command; /* == status reg */ 987 988 /* 989 * Fill in Extend bit, and the high order bytes 990 * if applicable. 991 */ 992 if (tf->flags & ATA_TFLAG_LBA48) { 993 desc[2] |= 0x01; 994 desc[4] = tf->hob_nsect; 995 desc[6] = tf->hob_lbal; 996 desc[8] = tf->hob_lbam; 997 desc[10] = tf->hob_lbah; 998 } 999 } 1000 1001 /** 1002 * ata_gen_ata_sense - generate a SCSI fixed sense block 1003 * @qc: Command that we are erroring out 1004 * 1005 * Generate sense block for a failed ATA command @qc. Descriptor 1006 * format is used to accomodate LBA48 block address. 1007 * 1008 * LOCKING: 1009 * None. 1010 */ 1011 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1012 { 1013 struct ata_device *dev = qc->dev; 1014 struct scsi_cmnd *cmd = qc->scsicmd; 1015 struct ata_taskfile *tf = &qc->result_tf; 1016 unsigned char *sb = cmd->sense_buffer; 1017 unsigned char *desc = sb + 8; 1018 int verbose = qc->ap->ops->error_handler == NULL; 1019 u64 block; 1020 1021 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1022 1023 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1024 1025 /* sense data is current and format is descriptor */ 1026 sb[0] = 0x72; 1027 1028 /* Use ata_to_sense_error() to map status register bits 1029 * onto sense key, asc & ascq. 1030 */ 1031 if (qc->err_mask || 1032 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1033 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1034 &sb[1], &sb[2], &sb[3], verbose); 1035 sb[1] &= 0x0f; 1036 } 1037 1038 block = ata_tf_read_block(&qc->result_tf, dev); 1039 1040 /* information sense data descriptor */ 1041 sb[7] = 12; 1042 desc[0] = 0x00; 1043 desc[1] = 10; 1044 1045 desc[2] |= 0x80; /* valid */ 1046 desc[6] = block >> 40; 1047 desc[7] = block >> 32; 1048 desc[8] = block >> 24; 1049 desc[9] = block >> 16; 1050 desc[10] = block >> 8; 1051 desc[11] = block; 1052 } 1053 1054 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1055 { 1056 sdev->use_10_for_rw = 1; 1057 sdev->use_10_for_ms = 1; 1058 1059 /* Schedule policy is determined by ->qc_defer() callback and 1060 * it needs to see every deferred qc. Set dev_blocked to 1 to 1061 * prevent SCSI midlayer from automatically deferring 1062 * requests. 1063 */ 1064 sdev->max_device_blocked = 1; 1065 } 1066 1067 /** 1068 * atapi_drain_needed - Check whether data transfer may overflow 1069 * @rq: request to be checked 1070 * 1071 * ATAPI commands which transfer variable length data to host 1072 * might overflow due to application error or hardare bug. This 1073 * function checks whether overflow should be drained and ignored 1074 * for @request. 1075 * 1076 * LOCKING: 1077 * None. 1078 * 1079 * RETURNS: 1080 * 1 if ; otherwise, 0. 1081 */ 1082 static int atapi_drain_needed(struct request *rq) 1083 { 1084 if (likely(!blk_pc_request(rq))) 1085 return 0; 1086 1087 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW)) 1088 return 0; 1089 1090 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1091 } 1092 1093 static int ata_scsi_dev_config(struct scsi_device *sdev, 1094 struct ata_device *dev) 1095 { 1096 if (!ata_id_has_unload(dev->id)) 1097 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1098 1099 /* configure max sectors */ 1100 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 1101 1102 if (dev->class == ATA_DEV_ATAPI) { 1103 struct request_queue *q = sdev->request_queue; 1104 void *buf; 1105 1106 /* set the min alignment and padding */ 1107 blk_queue_update_dma_alignment(sdev->request_queue, 1108 ATA_DMA_PAD_SZ - 1); 1109 blk_queue_update_dma_pad(sdev->request_queue, 1110 ATA_DMA_PAD_SZ - 1); 1111 1112 /* configure draining */ 1113 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1114 if (!buf) { 1115 ata_dev_printk(dev, KERN_ERR, 1116 "drain buffer allocation failed\n"); 1117 return -ENOMEM; 1118 } 1119 1120 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1121 } else { 1122 /* ATA devices must be sector aligned */ 1123 blk_queue_update_dma_alignment(sdev->request_queue, 1124 ATA_SECT_SIZE - 1); 1125 sdev->manage_start_stop = 1; 1126 } 1127 1128 if (dev->flags & ATA_DFLAG_AN) 1129 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1130 1131 if (dev->flags & ATA_DFLAG_NCQ) { 1132 int depth; 1133 1134 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1135 depth = min(ATA_MAX_QUEUE - 1, depth); 1136 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1137 } 1138 1139 return 0; 1140 } 1141 1142 /** 1143 * ata_scsi_slave_config - Set SCSI device attributes 1144 * @sdev: SCSI device to examine 1145 * 1146 * This is called before we actually start reading 1147 * and writing to the device, to configure certain 1148 * SCSI mid-layer behaviors. 1149 * 1150 * LOCKING: 1151 * Defined by SCSI layer. We don't really care. 1152 */ 1153 1154 int ata_scsi_slave_config(struct scsi_device *sdev) 1155 { 1156 struct ata_port *ap = ata_shost_to_port(sdev->host); 1157 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1158 int rc = 0; 1159 1160 ata_scsi_sdev_config(sdev); 1161 1162 if (dev) 1163 rc = ata_scsi_dev_config(sdev, dev); 1164 1165 return rc; 1166 } 1167 1168 /** 1169 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1170 * @sdev: SCSI device to be destroyed 1171 * 1172 * @sdev is about to be destroyed for hot/warm unplugging. If 1173 * this unplugging was initiated by libata as indicated by NULL 1174 * dev->sdev, this function doesn't have to do anything. 1175 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1176 * Clear dev->sdev, schedule the device for ATA detach and invoke 1177 * EH. 1178 * 1179 * LOCKING: 1180 * Defined by SCSI layer. We don't really care. 1181 */ 1182 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1183 { 1184 struct ata_port *ap = ata_shost_to_port(sdev->host); 1185 struct request_queue *q = sdev->request_queue; 1186 unsigned long flags; 1187 struct ata_device *dev; 1188 1189 if (!ap->ops->error_handler) 1190 return; 1191 1192 spin_lock_irqsave(ap->lock, flags); 1193 dev = __ata_scsi_find_dev(ap, sdev); 1194 if (dev && dev->sdev) { 1195 /* SCSI device already in CANCEL state, no need to offline it */ 1196 dev->sdev = NULL; 1197 dev->flags |= ATA_DFLAG_DETACH; 1198 ata_port_schedule_eh(ap); 1199 } 1200 spin_unlock_irqrestore(ap->lock, flags); 1201 1202 kfree(q->dma_drain_buffer); 1203 q->dma_drain_buffer = NULL; 1204 q->dma_drain_size = 0; 1205 } 1206 1207 /** 1208 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1209 * @sdev: SCSI device to configure queue depth for 1210 * @queue_depth: new queue depth 1211 * @reason: calling context 1212 * 1213 * This is libata standard hostt->change_queue_depth callback. 1214 * SCSI will call into this callback when user tries to set queue 1215 * depth via sysfs. 1216 * 1217 * LOCKING: 1218 * SCSI layer (we don't care) 1219 * 1220 * RETURNS: 1221 * Newly configured queue depth. 1222 */ 1223 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1224 int reason) 1225 { 1226 struct ata_port *ap = ata_shost_to_port(sdev->host); 1227 struct ata_device *dev; 1228 unsigned long flags; 1229 1230 if (reason != SCSI_QDEPTH_DEFAULT) 1231 return -EOPNOTSUPP; 1232 1233 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1234 return sdev->queue_depth; 1235 1236 dev = ata_scsi_find_dev(ap, sdev); 1237 if (!dev || !ata_dev_enabled(dev)) 1238 return sdev->queue_depth; 1239 1240 /* NCQ enabled? */ 1241 spin_lock_irqsave(ap->lock, flags); 1242 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1243 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1244 dev->flags |= ATA_DFLAG_NCQ_OFF; 1245 queue_depth = 1; 1246 } 1247 spin_unlock_irqrestore(ap->lock, flags); 1248 1249 /* limit and apply queue depth */ 1250 queue_depth = min(queue_depth, sdev->host->can_queue); 1251 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1252 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1253 1254 if (sdev->queue_depth == queue_depth) 1255 return -EINVAL; 1256 1257 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1258 return queue_depth; 1259 } 1260 1261 /** 1262 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1263 * @qc: Storage for translated ATA taskfile 1264 * 1265 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1266 * (to start). Perhaps these commands should be preceded by 1267 * CHECK POWER MODE to see what power mode the device is already in. 1268 * [See SAT revision 5 at www.t10.org] 1269 * 1270 * LOCKING: 1271 * spin_lock_irqsave(host lock) 1272 * 1273 * RETURNS: 1274 * Zero on success, non-zero on error. 1275 */ 1276 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1277 { 1278 struct scsi_cmnd *scmd = qc->scsicmd; 1279 struct ata_taskfile *tf = &qc->tf; 1280 const u8 *cdb = scmd->cmnd; 1281 1282 if (scmd->cmd_len < 5) 1283 goto invalid_fld; 1284 1285 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1286 tf->protocol = ATA_PROT_NODATA; 1287 if (cdb[1] & 0x1) { 1288 ; /* ignore IMMED bit, violates sat-r05 */ 1289 } 1290 if (cdb[4] & 0x2) 1291 goto invalid_fld; /* LOEJ bit set not supported */ 1292 if (((cdb[4] >> 4) & 0xf) != 0) 1293 goto invalid_fld; /* power conditions not supported */ 1294 1295 if (cdb[4] & 0x1) { 1296 tf->nsect = 1; /* 1 sector, lba=0 */ 1297 1298 if (qc->dev->flags & ATA_DFLAG_LBA) { 1299 tf->flags |= ATA_TFLAG_LBA; 1300 1301 tf->lbah = 0x0; 1302 tf->lbam = 0x0; 1303 tf->lbal = 0x0; 1304 tf->device |= ATA_LBA; 1305 } else { 1306 /* CHS */ 1307 tf->lbal = 0x1; /* sect */ 1308 tf->lbam = 0x0; /* cyl low */ 1309 tf->lbah = 0x0; /* cyl high */ 1310 } 1311 1312 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1313 } else { 1314 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1315 * or S5) causing some drives to spin up and down again. 1316 */ 1317 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1318 system_state == SYSTEM_POWER_OFF) 1319 goto skip; 1320 1321 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1322 system_entering_hibernation()) 1323 goto skip; 1324 1325 /* Issue ATA STANDBY IMMEDIATE command */ 1326 tf->command = ATA_CMD_STANDBYNOW1; 1327 } 1328 1329 /* 1330 * Standby and Idle condition timers could be implemented but that 1331 * would require libata to implement the Power condition mode page 1332 * and allow the user to change it. Changing mode pages requires 1333 * MODE SELECT to be implemented. 1334 */ 1335 1336 return 0; 1337 1338 invalid_fld: 1339 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1340 /* "Invalid field in cbd" */ 1341 return 1; 1342 skip: 1343 scmd->result = SAM_STAT_GOOD; 1344 return 1; 1345 } 1346 1347 1348 /** 1349 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1350 * @qc: Storage for translated ATA taskfile 1351 * 1352 * Sets up an ATA taskfile to issue FLUSH CACHE or 1353 * FLUSH CACHE EXT. 1354 * 1355 * LOCKING: 1356 * spin_lock_irqsave(host lock) 1357 * 1358 * RETURNS: 1359 * Zero on success, non-zero on error. 1360 */ 1361 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1362 { 1363 struct ata_taskfile *tf = &qc->tf; 1364 1365 tf->flags |= ATA_TFLAG_DEVICE; 1366 tf->protocol = ATA_PROT_NODATA; 1367 1368 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1369 tf->command = ATA_CMD_FLUSH_EXT; 1370 else 1371 tf->command = ATA_CMD_FLUSH; 1372 1373 /* flush is critical for IO integrity, consider it an IO command */ 1374 qc->flags |= ATA_QCFLAG_IO; 1375 1376 return 0; 1377 } 1378 1379 /** 1380 * scsi_6_lba_len - Get LBA and transfer length 1381 * @cdb: SCSI command to translate 1382 * 1383 * Calculate LBA and transfer length for 6-byte commands. 1384 * 1385 * RETURNS: 1386 * @plba: the LBA 1387 * @plen: the transfer length 1388 */ 1389 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1390 { 1391 u64 lba = 0; 1392 u32 len; 1393 1394 VPRINTK("six-byte command\n"); 1395 1396 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1397 lba |= ((u64)cdb[2]) << 8; 1398 lba |= ((u64)cdb[3]); 1399 1400 len = cdb[4]; 1401 1402 *plba = lba; 1403 *plen = len; 1404 } 1405 1406 /** 1407 * scsi_10_lba_len - Get LBA and transfer length 1408 * @cdb: SCSI command to translate 1409 * 1410 * Calculate LBA and transfer length for 10-byte commands. 1411 * 1412 * RETURNS: 1413 * @plba: the LBA 1414 * @plen: the transfer length 1415 */ 1416 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1417 { 1418 u64 lba = 0; 1419 u32 len = 0; 1420 1421 VPRINTK("ten-byte command\n"); 1422 1423 lba |= ((u64)cdb[2]) << 24; 1424 lba |= ((u64)cdb[3]) << 16; 1425 lba |= ((u64)cdb[4]) << 8; 1426 lba |= ((u64)cdb[5]); 1427 1428 len |= ((u32)cdb[7]) << 8; 1429 len |= ((u32)cdb[8]); 1430 1431 *plba = lba; 1432 *plen = len; 1433 } 1434 1435 /** 1436 * scsi_16_lba_len - Get LBA and transfer length 1437 * @cdb: SCSI command to translate 1438 * 1439 * Calculate LBA and transfer length for 16-byte commands. 1440 * 1441 * RETURNS: 1442 * @plba: the LBA 1443 * @plen: the transfer length 1444 */ 1445 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1446 { 1447 u64 lba = 0; 1448 u32 len = 0; 1449 1450 VPRINTK("sixteen-byte command\n"); 1451 1452 lba |= ((u64)cdb[2]) << 56; 1453 lba |= ((u64)cdb[3]) << 48; 1454 lba |= ((u64)cdb[4]) << 40; 1455 lba |= ((u64)cdb[5]) << 32; 1456 lba |= ((u64)cdb[6]) << 24; 1457 lba |= ((u64)cdb[7]) << 16; 1458 lba |= ((u64)cdb[8]) << 8; 1459 lba |= ((u64)cdb[9]); 1460 1461 len |= ((u32)cdb[10]) << 24; 1462 len |= ((u32)cdb[11]) << 16; 1463 len |= ((u32)cdb[12]) << 8; 1464 len |= ((u32)cdb[13]); 1465 1466 *plba = lba; 1467 *plen = len; 1468 } 1469 1470 /** 1471 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1472 * @qc: Storage for translated ATA taskfile 1473 * 1474 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1475 * 1476 * LOCKING: 1477 * spin_lock_irqsave(host lock) 1478 * 1479 * RETURNS: 1480 * Zero on success, non-zero on error. 1481 */ 1482 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1483 { 1484 struct scsi_cmnd *scmd = qc->scsicmd; 1485 struct ata_taskfile *tf = &qc->tf; 1486 struct ata_device *dev = qc->dev; 1487 u64 dev_sectors = qc->dev->n_sectors; 1488 const u8 *cdb = scmd->cmnd; 1489 u64 block; 1490 u32 n_block; 1491 1492 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1493 tf->protocol = ATA_PROT_NODATA; 1494 1495 if (cdb[0] == VERIFY) { 1496 if (scmd->cmd_len < 10) 1497 goto invalid_fld; 1498 scsi_10_lba_len(cdb, &block, &n_block); 1499 } else if (cdb[0] == VERIFY_16) { 1500 if (scmd->cmd_len < 16) 1501 goto invalid_fld; 1502 scsi_16_lba_len(cdb, &block, &n_block); 1503 } else 1504 goto invalid_fld; 1505 1506 if (!n_block) 1507 goto nothing_to_do; 1508 if (block >= dev_sectors) 1509 goto out_of_range; 1510 if ((block + n_block) > dev_sectors) 1511 goto out_of_range; 1512 1513 if (dev->flags & ATA_DFLAG_LBA) { 1514 tf->flags |= ATA_TFLAG_LBA; 1515 1516 if (lba_28_ok(block, n_block)) { 1517 /* use LBA28 */ 1518 tf->command = ATA_CMD_VERIFY; 1519 tf->device |= (block >> 24) & 0xf; 1520 } else if (lba_48_ok(block, n_block)) { 1521 if (!(dev->flags & ATA_DFLAG_LBA48)) 1522 goto out_of_range; 1523 1524 /* use LBA48 */ 1525 tf->flags |= ATA_TFLAG_LBA48; 1526 tf->command = ATA_CMD_VERIFY_EXT; 1527 1528 tf->hob_nsect = (n_block >> 8) & 0xff; 1529 1530 tf->hob_lbah = (block >> 40) & 0xff; 1531 tf->hob_lbam = (block >> 32) & 0xff; 1532 tf->hob_lbal = (block >> 24) & 0xff; 1533 } else 1534 /* request too large even for LBA48 */ 1535 goto out_of_range; 1536 1537 tf->nsect = n_block & 0xff; 1538 1539 tf->lbah = (block >> 16) & 0xff; 1540 tf->lbam = (block >> 8) & 0xff; 1541 tf->lbal = block & 0xff; 1542 1543 tf->device |= ATA_LBA; 1544 } else { 1545 /* CHS */ 1546 u32 sect, head, cyl, track; 1547 1548 if (!lba_28_ok(block, n_block)) 1549 goto out_of_range; 1550 1551 /* Convert LBA to CHS */ 1552 track = (u32)block / dev->sectors; 1553 cyl = track / dev->heads; 1554 head = track % dev->heads; 1555 sect = (u32)block % dev->sectors + 1; 1556 1557 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1558 (u32)block, track, cyl, head, sect); 1559 1560 /* Check whether the converted CHS can fit. 1561 Cylinder: 0-65535 1562 Head: 0-15 1563 Sector: 1-255*/ 1564 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1565 goto out_of_range; 1566 1567 tf->command = ATA_CMD_VERIFY; 1568 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1569 tf->lbal = sect; 1570 tf->lbam = cyl; 1571 tf->lbah = cyl >> 8; 1572 tf->device |= head; 1573 } 1574 1575 return 0; 1576 1577 invalid_fld: 1578 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1579 /* "Invalid field in cbd" */ 1580 return 1; 1581 1582 out_of_range: 1583 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1584 /* "Logical Block Address out of range" */ 1585 return 1; 1586 1587 nothing_to_do: 1588 scmd->result = SAM_STAT_GOOD; 1589 return 1; 1590 } 1591 1592 /** 1593 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1594 * @qc: Storage for translated ATA taskfile 1595 * 1596 * Converts any of six SCSI read/write commands into the 1597 * ATA counterpart, including starting sector (LBA), 1598 * sector count, and taking into account the device's LBA48 1599 * support. 1600 * 1601 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1602 * %WRITE_16 are currently supported. 1603 * 1604 * LOCKING: 1605 * spin_lock_irqsave(host lock) 1606 * 1607 * RETURNS: 1608 * Zero on success, non-zero on error. 1609 */ 1610 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1611 { 1612 struct scsi_cmnd *scmd = qc->scsicmd; 1613 const u8 *cdb = scmd->cmnd; 1614 unsigned int tf_flags = 0; 1615 u64 block; 1616 u32 n_block; 1617 int rc; 1618 1619 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1620 tf_flags |= ATA_TFLAG_WRITE; 1621 1622 /* Calculate the SCSI LBA, transfer length and FUA. */ 1623 switch (cdb[0]) { 1624 case READ_10: 1625 case WRITE_10: 1626 if (unlikely(scmd->cmd_len < 10)) 1627 goto invalid_fld; 1628 scsi_10_lba_len(cdb, &block, &n_block); 1629 if (unlikely(cdb[1] & (1 << 3))) 1630 tf_flags |= ATA_TFLAG_FUA; 1631 break; 1632 case READ_6: 1633 case WRITE_6: 1634 if (unlikely(scmd->cmd_len < 6)) 1635 goto invalid_fld; 1636 scsi_6_lba_len(cdb, &block, &n_block); 1637 1638 /* for 6-byte r/w commands, transfer length 0 1639 * means 256 blocks of data, not 0 block. 1640 */ 1641 if (!n_block) 1642 n_block = 256; 1643 break; 1644 case READ_16: 1645 case WRITE_16: 1646 if (unlikely(scmd->cmd_len < 16)) 1647 goto invalid_fld; 1648 scsi_16_lba_len(cdb, &block, &n_block); 1649 if (unlikely(cdb[1] & (1 << 3))) 1650 tf_flags |= ATA_TFLAG_FUA; 1651 break; 1652 default: 1653 DPRINTK("no-byte command\n"); 1654 goto invalid_fld; 1655 } 1656 1657 /* Check and compose ATA command */ 1658 if (!n_block) 1659 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1660 * length 0 means transfer 0 block of data. 1661 * However, for ATA R/W commands, sector count 0 means 1662 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1663 * 1664 * WARNING: one or two older ATA drives treat 0 as 0... 1665 */ 1666 goto nothing_to_do; 1667 1668 qc->flags |= ATA_QCFLAG_IO; 1669 qc->nbytes = n_block * ATA_SECT_SIZE; 1670 1671 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1672 qc->tag); 1673 if (likely(rc == 0)) 1674 return 0; 1675 1676 if (rc == -ERANGE) 1677 goto out_of_range; 1678 /* treat all other errors as -EINVAL, fall through */ 1679 invalid_fld: 1680 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1681 /* "Invalid field in cbd" */ 1682 return 1; 1683 1684 out_of_range: 1685 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1686 /* "Logical Block Address out of range" */ 1687 return 1; 1688 1689 nothing_to_do: 1690 scmd->result = SAM_STAT_GOOD; 1691 return 1; 1692 } 1693 1694 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1695 { 1696 struct ata_port *ap = qc->ap; 1697 struct scsi_cmnd *cmd = qc->scsicmd; 1698 u8 *cdb = cmd->cmnd; 1699 int need_sense = (qc->err_mask != 0); 1700 1701 /* For ATA pass thru (SAT) commands, generate a sense block if 1702 * user mandated it or if there's an error. Note that if we 1703 * generate because the user forced us to, a check condition 1704 * is generated and the ATA register values are returned 1705 * whether the command completed successfully or not. If there 1706 * was no error, SK, ASC and ASCQ will all be zero. 1707 */ 1708 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1709 ((cdb[2] & 0x20) || need_sense)) { 1710 ata_gen_passthru_sense(qc); 1711 } else { 1712 if (!need_sense) { 1713 cmd->result = SAM_STAT_GOOD; 1714 } else { 1715 /* TODO: decide which descriptor format to use 1716 * for 48b LBA devices and call that here 1717 * instead of the fixed desc, which is only 1718 * good for smaller LBA (and maybe CHS?) 1719 * devices. 1720 */ 1721 ata_gen_ata_sense(qc); 1722 } 1723 } 1724 1725 if (need_sense && !ap->ops->error_handler) 1726 ata_dump_status(ap->print_id, &qc->result_tf); 1727 1728 qc->scsidone(cmd); 1729 1730 ata_qc_free(qc); 1731 } 1732 1733 /** 1734 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1735 * @dev: ATA device to which the command is addressed 1736 * @cmd: SCSI command to execute 1737 * @done: SCSI command completion function 1738 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1739 * 1740 * Our ->queuecommand() function has decided that the SCSI 1741 * command issued can be directly translated into an ATA 1742 * command, rather than handled internally. 1743 * 1744 * This function sets up an ata_queued_cmd structure for the 1745 * SCSI command, and sends that ata_queued_cmd to the hardware. 1746 * 1747 * The xlat_func argument (actor) returns 0 if ready to execute 1748 * ATA command, else 1 to finish translation. If 1 is returned 1749 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1750 * to be set reflecting an error condition or clean (early) 1751 * termination. 1752 * 1753 * LOCKING: 1754 * spin_lock_irqsave(host lock) 1755 * 1756 * RETURNS: 1757 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1758 * needs to be deferred. 1759 */ 1760 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1761 void (*done)(struct scsi_cmnd *), 1762 ata_xlat_func_t xlat_func) 1763 { 1764 struct ata_port *ap = dev->link->ap; 1765 struct ata_queued_cmd *qc; 1766 int rc; 1767 1768 VPRINTK("ENTER\n"); 1769 1770 qc = ata_scsi_qc_new(dev, cmd, done); 1771 if (!qc) 1772 goto err_mem; 1773 1774 /* data is present; dma-map it */ 1775 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1776 cmd->sc_data_direction == DMA_TO_DEVICE) { 1777 if (unlikely(scsi_bufflen(cmd) < 1)) { 1778 ata_dev_printk(dev, KERN_WARNING, 1779 "WARNING: zero len r/w req\n"); 1780 goto err_did; 1781 } 1782 1783 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1784 1785 qc->dma_dir = cmd->sc_data_direction; 1786 } 1787 1788 qc->complete_fn = ata_scsi_qc_complete; 1789 1790 if (xlat_func(qc)) 1791 goto early_finish; 1792 1793 if (ap->ops->qc_defer) { 1794 if ((rc = ap->ops->qc_defer(qc))) 1795 goto defer; 1796 } 1797 1798 /* select device, send command to hardware */ 1799 ata_qc_issue(qc); 1800 1801 VPRINTK("EXIT\n"); 1802 return 0; 1803 1804 early_finish: 1805 ata_qc_free(qc); 1806 qc->scsidone(cmd); 1807 DPRINTK("EXIT - early finish (good or error)\n"); 1808 return 0; 1809 1810 err_did: 1811 ata_qc_free(qc); 1812 cmd->result = (DID_ERROR << 16); 1813 qc->scsidone(cmd); 1814 err_mem: 1815 DPRINTK("EXIT - internal\n"); 1816 return 0; 1817 1818 defer: 1819 ata_qc_free(qc); 1820 DPRINTK("EXIT - defer\n"); 1821 if (rc == ATA_DEFER_LINK) 1822 return SCSI_MLQUEUE_DEVICE_BUSY; 1823 else 1824 return SCSI_MLQUEUE_HOST_BUSY; 1825 } 1826 1827 /** 1828 * ata_scsi_rbuf_get - Map response buffer. 1829 * @cmd: SCSI command containing buffer to be mapped. 1830 * @flags: unsigned long variable to store irq enable status 1831 * @copy_in: copy in from user buffer 1832 * 1833 * Prepare buffer for simulated SCSI commands. 1834 * 1835 * LOCKING: 1836 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1837 * 1838 * RETURNS: 1839 * Pointer to response buffer. 1840 */ 1841 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1842 unsigned long *flags) 1843 { 1844 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1845 1846 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1847 if (copy_in) 1848 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1849 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1850 return ata_scsi_rbuf; 1851 } 1852 1853 /** 1854 * ata_scsi_rbuf_put - Unmap response buffer. 1855 * @cmd: SCSI command containing buffer to be unmapped. 1856 * @copy_out: copy out result 1857 * @flags: @flags passed to ata_scsi_rbuf_get() 1858 * 1859 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1860 * @copy_back is true. 1861 * 1862 * LOCKING: 1863 * Unlocks ata_scsi_rbuf_lock. 1864 */ 1865 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1866 unsigned long *flags) 1867 { 1868 if (copy_out) 1869 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1870 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1871 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1872 } 1873 1874 /** 1875 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1876 * @args: device IDENTIFY data / SCSI command of interest. 1877 * @actor: Callback hook for desired SCSI command simulator 1878 * 1879 * Takes care of the hard work of simulating a SCSI command... 1880 * Mapping the response buffer, calling the command's handler, 1881 * and handling the handler's return value. This return value 1882 * indicates whether the handler wishes the SCSI command to be 1883 * completed successfully (0), or not (in which case cmd->result 1884 * and sense buffer are assumed to be set). 1885 * 1886 * LOCKING: 1887 * spin_lock_irqsave(host lock) 1888 */ 1889 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1890 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1891 { 1892 u8 *rbuf; 1893 unsigned int rc; 1894 struct scsi_cmnd *cmd = args->cmd; 1895 unsigned long flags; 1896 1897 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1898 rc = actor(args, rbuf); 1899 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1900 1901 if (rc == 0) 1902 cmd->result = SAM_STAT_GOOD; 1903 args->done(cmd); 1904 } 1905 1906 /** 1907 * ata_scsiop_inq_std - Simulate INQUIRY command 1908 * @args: device IDENTIFY data / SCSI command of interest. 1909 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1910 * 1911 * Returns standard device identification data associated 1912 * with non-VPD INQUIRY command output. 1913 * 1914 * LOCKING: 1915 * spin_lock_irqsave(host lock) 1916 */ 1917 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1918 { 1919 const u8 versions[] = { 1920 0x60, /* SAM-3 (no version claimed) */ 1921 1922 0x03, 1923 0x20, /* SBC-2 (no version claimed) */ 1924 1925 0x02, 1926 0x60 /* SPC-3 (no version claimed) */ 1927 }; 1928 u8 hdr[] = { 1929 TYPE_DISK, 1930 0, 1931 0x5, /* claim SPC-3 version compatibility */ 1932 2, 1933 95 - 4 1934 }; 1935 1936 VPRINTK("ENTER\n"); 1937 1938 /* set scsi removeable (RMB) bit per ata bit */ 1939 if (ata_id_removeable(args->id)) 1940 hdr[1] |= (1 << 7); 1941 1942 memcpy(rbuf, hdr, sizeof(hdr)); 1943 memcpy(&rbuf[8], "ATA ", 8); 1944 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1945 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1946 1947 if (rbuf[32] == 0 || rbuf[32] == ' ') 1948 memcpy(&rbuf[32], "n/a ", 4); 1949 1950 memcpy(rbuf + 59, versions, sizeof(versions)); 1951 1952 return 0; 1953 } 1954 1955 /** 1956 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1957 * @args: device IDENTIFY data / SCSI command of interest. 1958 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1959 * 1960 * Returns list of inquiry VPD pages available. 1961 * 1962 * LOCKING: 1963 * spin_lock_irqsave(host lock) 1964 */ 1965 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1966 { 1967 const u8 pages[] = { 1968 0x00, /* page 0x00, this page */ 1969 0x80, /* page 0x80, unit serial no page */ 1970 0x83, /* page 0x83, device ident page */ 1971 0x89, /* page 0x89, ata info page */ 1972 0xb0, /* page 0xb0, block limits page */ 1973 0xb1, /* page 0xb1, block device characteristics page */ 1974 }; 1975 1976 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1977 memcpy(rbuf + 4, pages, sizeof(pages)); 1978 return 0; 1979 } 1980 1981 /** 1982 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1983 * @args: device IDENTIFY data / SCSI command of interest. 1984 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1985 * 1986 * Returns ATA device serial number. 1987 * 1988 * LOCKING: 1989 * spin_lock_irqsave(host lock) 1990 */ 1991 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1992 { 1993 const u8 hdr[] = { 1994 0, 1995 0x80, /* this page code */ 1996 0, 1997 ATA_ID_SERNO_LEN, /* page len */ 1998 }; 1999 2000 memcpy(rbuf, hdr, sizeof(hdr)); 2001 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2002 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2003 return 0; 2004 } 2005 2006 /** 2007 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2008 * @args: device IDENTIFY data / SCSI command of interest. 2009 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2010 * 2011 * Yields two logical unit device identification designators: 2012 * - vendor specific ASCII containing the ATA serial number 2013 * - SAT defined "t10 vendor id based" containing ASCII vendor 2014 * name ("ATA "), model and serial numbers. 2015 * 2016 * LOCKING: 2017 * spin_lock_irqsave(host lock) 2018 */ 2019 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2020 { 2021 const int sat_model_serial_desc_len = 68; 2022 int num; 2023 2024 rbuf[1] = 0x83; /* this page code */ 2025 num = 4; 2026 2027 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2028 rbuf[num + 0] = 2; 2029 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2030 num += 4; 2031 ata_id_string(args->id, (unsigned char *) rbuf + num, 2032 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2033 num += ATA_ID_SERNO_LEN; 2034 2035 /* SAT defined lu model and serial numbers descriptor */ 2036 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2037 rbuf[num + 0] = 2; 2038 rbuf[num + 1] = 1; 2039 rbuf[num + 3] = sat_model_serial_desc_len; 2040 num += 4; 2041 memcpy(rbuf + num, "ATA ", 8); 2042 num += 8; 2043 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2044 ATA_ID_PROD_LEN); 2045 num += ATA_ID_PROD_LEN; 2046 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2047 ATA_ID_SERNO_LEN); 2048 num += ATA_ID_SERNO_LEN; 2049 2050 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2051 return 0; 2052 } 2053 2054 /** 2055 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2056 * @args: device IDENTIFY data / SCSI command of interest. 2057 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2058 * 2059 * Yields SAT-specified ATA VPD page. 2060 * 2061 * LOCKING: 2062 * spin_lock_irqsave(host lock) 2063 */ 2064 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2065 { 2066 struct ata_taskfile tf; 2067 2068 memset(&tf, 0, sizeof(tf)); 2069 2070 rbuf[1] = 0x89; /* our page code */ 2071 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2072 rbuf[3] = (0x238 & 0xff); 2073 2074 memcpy(&rbuf[8], "linux ", 8); 2075 memcpy(&rbuf[16], "libata ", 16); 2076 memcpy(&rbuf[32], DRV_VERSION, 4); 2077 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2078 2079 /* we don't store the ATA device signature, so we fake it */ 2080 2081 tf.command = ATA_DRDY; /* really, this is Status reg */ 2082 tf.lbal = 0x1; 2083 tf.nsect = 0x1; 2084 2085 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2086 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2087 2088 rbuf[56] = ATA_CMD_ID_ATA; 2089 2090 memcpy(&rbuf[60], &args->id[0], 512); 2091 return 0; 2092 } 2093 2094 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2095 { 2096 u32 min_io_sectors; 2097 2098 rbuf[1] = 0xb0; 2099 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2100 2101 /* 2102 * Optimal transfer length granularity. 2103 * 2104 * This is always one physical block, but for disks with a smaller 2105 * logical than physical sector size we need to figure out what the 2106 * latter is. 2107 */ 2108 if (ata_id_has_large_logical_sectors(args->id)) 2109 min_io_sectors = ata_id_logical_per_physical_sectors(args->id); 2110 else 2111 min_io_sectors = 1; 2112 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2113 2114 /* 2115 * Optimal unmap granularity. 2116 * 2117 * The ATA spec doesn't even know about a granularity or alignment 2118 * for the TRIM command. We can leave away most of the unmap related 2119 * VPD page entries, but we have specifify a granularity to signal 2120 * that we support some form of unmap - in thise case via WRITE SAME 2121 * with the unmap bit set. 2122 */ 2123 if (ata_id_has_trim(args->id)) { 2124 put_unaligned_be32(65535 * 512 / 8, &rbuf[20]); 2125 put_unaligned_be32(1, &rbuf[28]); 2126 } 2127 2128 return 0; 2129 } 2130 2131 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2132 { 2133 int form_factor = ata_id_form_factor(args->id); 2134 int media_rotation_rate = ata_id_rotation_rate(args->id); 2135 2136 rbuf[1] = 0xb1; 2137 rbuf[3] = 0x3c; 2138 rbuf[4] = media_rotation_rate >> 8; 2139 rbuf[5] = media_rotation_rate; 2140 rbuf[7] = form_factor; 2141 2142 return 0; 2143 } 2144 2145 /** 2146 * ata_scsiop_noop - Command handler that simply returns success. 2147 * @args: device IDENTIFY data / SCSI command of interest. 2148 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2149 * 2150 * No operation. Simply returns success to caller, to indicate 2151 * that the caller should successfully complete this SCSI command. 2152 * 2153 * LOCKING: 2154 * spin_lock_irqsave(host lock) 2155 */ 2156 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2157 { 2158 VPRINTK("ENTER\n"); 2159 return 0; 2160 } 2161 2162 /** 2163 * ata_msense_caching - Simulate MODE SENSE caching info page 2164 * @id: device IDENTIFY data 2165 * @buf: output buffer 2166 * 2167 * Generate a caching info page, which conditionally indicates 2168 * write caching to the SCSI layer, depending on device 2169 * capabilities. 2170 * 2171 * LOCKING: 2172 * None. 2173 */ 2174 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2175 { 2176 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2177 if (ata_id_wcache_enabled(id)) 2178 buf[2] |= (1 << 2); /* write cache enable */ 2179 if (!ata_id_rahead_enabled(id)) 2180 buf[12] |= (1 << 5); /* disable read ahead */ 2181 return sizeof(def_cache_mpage); 2182 } 2183 2184 /** 2185 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2186 * @buf: output buffer 2187 * 2188 * Generate a generic MODE SENSE control mode page. 2189 * 2190 * LOCKING: 2191 * None. 2192 */ 2193 static unsigned int ata_msense_ctl_mode(u8 *buf) 2194 { 2195 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2196 return sizeof(def_control_mpage); 2197 } 2198 2199 /** 2200 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2201 * @buf: output buffer 2202 * 2203 * Generate a generic MODE SENSE r/w error recovery page. 2204 * 2205 * LOCKING: 2206 * None. 2207 */ 2208 static unsigned int ata_msense_rw_recovery(u8 *buf) 2209 { 2210 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2211 return sizeof(def_rw_recovery_mpage); 2212 } 2213 2214 /* 2215 * We can turn this into a real blacklist if it's needed, for now just 2216 * blacklist any Maxtor BANC1G10 revision firmware 2217 */ 2218 static int ata_dev_supports_fua(u16 *id) 2219 { 2220 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2221 2222 if (!libata_fua) 2223 return 0; 2224 if (!ata_id_has_fua(id)) 2225 return 0; 2226 2227 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2228 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2229 2230 if (strcmp(model, "Maxtor")) 2231 return 1; 2232 if (strcmp(fw, "BANC1G10")) 2233 return 1; 2234 2235 return 0; /* blacklisted */ 2236 } 2237 2238 /** 2239 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2240 * @args: device IDENTIFY data / SCSI command of interest. 2241 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2242 * 2243 * Simulate MODE SENSE commands. Assume this is invoked for direct 2244 * access devices (e.g. disks) only. There should be no block 2245 * descriptor for other device types. 2246 * 2247 * LOCKING: 2248 * spin_lock_irqsave(host lock) 2249 */ 2250 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2251 { 2252 struct ata_device *dev = args->dev; 2253 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2254 const u8 sat_blk_desc[] = { 2255 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2256 0, 2257 0, 0x2, 0x0 /* block length: 512 bytes */ 2258 }; 2259 u8 pg, spg; 2260 unsigned int ebd, page_control, six_byte; 2261 u8 dpofua; 2262 2263 VPRINTK("ENTER\n"); 2264 2265 six_byte = (scsicmd[0] == MODE_SENSE); 2266 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2267 /* 2268 * LLBA bit in msense(10) ignored (compliant) 2269 */ 2270 2271 page_control = scsicmd[2] >> 6; 2272 switch (page_control) { 2273 case 0: /* current */ 2274 break; /* supported */ 2275 case 3: /* saved */ 2276 goto saving_not_supp; 2277 case 1: /* changeable */ 2278 case 2: /* defaults */ 2279 default: 2280 goto invalid_fld; 2281 } 2282 2283 if (six_byte) 2284 p += 4 + (ebd ? 8 : 0); 2285 else 2286 p += 8 + (ebd ? 8 : 0); 2287 2288 pg = scsicmd[2] & 0x3f; 2289 spg = scsicmd[3]; 2290 /* 2291 * No mode subpages supported (yet) but asking for _all_ 2292 * subpages may be valid 2293 */ 2294 if (spg && (spg != ALL_SUB_MPAGES)) 2295 goto invalid_fld; 2296 2297 switch(pg) { 2298 case RW_RECOVERY_MPAGE: 2299 p += ata_msense_rw_recovery(p); 2300 break; 2301 2302 case CACHE_MPAGE: 2303 p += ata_msense_caching(args->id, p); 2304 break; 2305 2306 case CONTROL_MPAGE: 2307 p += ata_msense_ctl_mode(p); 2308 break; 2309 2310 case ALL_MPAGES: 2311 p += ata_msense_rw_recovery(p); 2312 p += ata_msense_caching(args->id, p); 2313 p += ata_msense_ctl_mode(p); 2314 break; 2315 2316 default: /* invalid page code */ 2317 goto invalid_fld; 2318 } 2319 2320 dpofua = 0; 2321 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2322 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2323 dpofua = 1 << 4; 2324 2325 if (six_byte) { 2326 rbuf[0] = p - rbuf - 1; 2327 rbuf[2] |= dpofua; 2328 if (ebd) { 2329 rbuf[3] = sizeof(sat_blk_desc); 2330 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2331 } 2332 } else { 2333 unsigned int output_len = p - rbuf - 2; 2334 2335 rbuf[0] = output_len >> 8; 2336 rbuf[1] = output_len; 2337 rbuf[3] |= dpofua; 2338 if (ebd) { 2339 rbuf[7] = sizeof(sat_blk_desc); 2340 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2341 } 2342 } 2343 return 0; 2344 2345 invalid_fld: 2346 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2347 /* "Invalid field in cbd" */ 2348 return 1; 2349 2350 saving_not_supp: 2351 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2352 /* "Saving parameters not supported" */ 2353 return 1; 2354 } 2355 2356 /** 2357 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2358 * @args: device IDENTIFY data / SCSI command of interest. 2359 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2360 * 2361 * Simulate READ CAPACITY commands. 2362 * 2363 * LOCKING: 2364 * None. 2365 */ 2366 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2367 { 2368 struct ata_device *dev = args->dev; 2369 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2370 u8 log_per_phys = 0; 2371 u16 lowest_aligned = 0; 2372 u16 word_106 = dev->id[106]; 2373 u16 word_209 = dev->id[209]; 2374 2375 if ((word_106 & 0xc000) == 0x4000) { 2376 /* Number and offset of logical sectors per physical sector */ 2377 if (word_106 & (1 << 13)) 2378 log_per_phys = word_106 & 0xf; 2379 if ((word_209 & 0xc000) == 0x4000) { 2380 u16 first = dev->id[209] & 0x3fff; 2381 if (first > 0) 2382 lowest_aligned = (1 << log_per_phys) - first; 2383 } 2384 } 2385 2386 VPRINTK("ENTER\n"); 2387 2388 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2389 if (last_lba >= 0xffffffffULL) 2390 last_lba = 0xffffffff; 2391 2392 /* sector count, 32-bit */ 2393 rbuf[0] = last_lba >> (8 * 3); 2394 rbuf[1] = last_lba >> (8 * 2); 2395 rbuf[2] = last_lba >> (8 * 1); 2396 rbuf[3] = last_lba; 2397 2398 /* sector size */ 2399 rbuf[6] = ATA_SECT_SIZE >> 8; 2400 rbuf[7] = ATA_SECT_SIZE & 0xff; 2401 } else { 2402 /* sector count, 64-bit */ 2403 rbuf[0] = last_lba >> (8 * 7); 2404 rbuf[1] = last_lba >> (8 * 6); 2405 rbuf[2] = last_lba >> (8 * 5); 2406 rbuf[3] = last_lba >> (8 * 4); 2407 rbuf[4] = last_lba >> (8 * 3); 2408 rbuf[5] = last_lba >> (8 * 2); 2409 rbuf[6] = last_lba >> (8 * 1); 2410 rbuf[7] = last_lba; 2411 2412 /* sector size */ 2413 rbuf[10] = ATA_SECT_SIZE >> 8; 2414 rbuf[11] = ATA_SECT_SIZE & 0xff; 2415 2416 rbuf[12] = 0; 2417 rbuf[13] = log_per_phys; 2418 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2419 rbuf[15] = lowest_aligned; 2420 2421 if (ata_id_has_trim(args->id)) { 2422 rbuf[14] |= 0x80; /* TPE */ 2423 2424 if (ata_id_has_zero_after_trim(args->id)) 2425 rbuf[14] |= 0x40; /* TPRZ */ 2426 } 2427 } 2428 2429 return 0; 2430 } 2431 2432 /** 2433 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2434 * @args: device IDENTIFY data / SCSI command of interest. 2435 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2436 * 2437 * Simulate REPORT LUNS command. 2438 * 2439 * LOCKING: 2440 * spin_lock_irqsave(host lock) 2441 */ 2442 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2443 { 2444 VPRINTK("ENTER\n"); 2445 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2446 2447 return 0; 2448 } 2449 2450 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2451 { 2452 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2453 /* FIXME: not quite right; we don't want the 2454 * translation of taskfile registers into 2455 * a sense descriptors, since that's only 2456 * correct for ATA, not ATAPI 2457 */ 2458 ata_gen_passthru_sense(qc); 2459 } 2460 2461 qc->scsidone(qc->scsicmd); 2462 ata_qc_free(qc); 2463 } 2464 2465 /* is it pointless to prefer PIO for "safety reasons"? */ 2466 static inline int ata_pio_use_silly(struct ata_port *ap) 2467 { 2468 return (ap->flags & ATA_FLAG_PIO_DMA); 2469 } 2470 2471 static void atapi_request_sense(struct ata_queued_cmd *qc) 2472 { 2473 struct ata_port *ap = qc->ap; 2474 struct scsi_cmnd *cmd = qc->scsicmd; 2475 2476 DPRINTK("ATAPI request sense\n"); 2477 2478 /* FIXME: is this needed? */ 2479 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2480 2481 #ifdef CONFIG_ATA_SFF 2482 if (ap->ops->sff_tf_read) 2483 ap->ops->sff_tf_read(ap, &qc->tf); 2484 #endif 2485 2486 /* fill these in, for the case where they are -not- overwritten */ 2487 cmd->sense_buffer[0] = 0x70; 2488 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2489 2490 ata_qc_reinit(qc); 2491 2492 /* setup sg table and init transfer direction */ 2493 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2494 ata_sg_init(qc, &qc->sgent, 1); 2495 qc->dma_dir = DMA_FROM_DEVICE; 2496 2497 memset(&qc->cdb, 0, qc->dev->cdb_len); 2498 qc->cdb[0] = REQUEST_SENSE; 2499 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2500 2501 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2502 qc->tf.command = ATA_CMD_PACKET; 2503 2504 if (ata_pio_use_silly(ap)) { 2505 qc->tf.protocol = ATAPI_PROT_DMA; 2506 qc->tf.feature |= ATAPI_PKT_DMA; 2507 } else { 2508 qc->tf.protocol = ATAPI_PROT_PIO; 2509 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2510 qc->tf.lbah = 0; 2511 } 2512 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2513 2514 qc->complete_fn = atapi_sense_complete; 2515 2516 ata_qc_issue(qc); 2517 2518 DPRINTK("EXIT\n"); 2519 } 2520 2521 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2522 { 2523 struct scsi_cmnd *cmd = qc->scsicmd; 2524 unsigned int err_mask = qc->err_mask; 2525 2526 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2527 2528 /* handle completion from new EH */ 2529 if (unlikely(qc->ap->ops->error_handler && 2530 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2531 2532 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2533 /* FIXME: not quite right; we don't want the 2534 * translation of taskfile registers into a 2535 * sense descriptors, since that's only 2536 * correct for ATA, not ATAPI 2537 */ 2538 ata_gen_passthru_sense(qc); 2539 } 2540 2541 /* SCSI EH automatically locks door if sdev->locked is 2542 * set. Sometimes door lock request continues to 2543 * fail, for example, when no media is present. This 2544 * creates a loop - SCSI EH issues door lock which 2545 * fails and gets invoked again to acquire sense data 2546 * for the failed command. 2547 * 2548 * If door lock fails, always clear sdev->locked to 2549 * avoid this infinite loop. 2550 */ 2551 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2552 qc->dev->sdev->locked = 0; 2553 2554 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2555 qc->scsidone(cmd); 2556 ata_qc_free(qc); 2557 return; 2558 } 2559 2560 /* successful completion or old EH failure path */ 2561 if (unlikely(err_mask & AC_ERR_DEV)) { 2562 cmd->result = SAM_STAT_CHECK_CONDITION; 2563 atapi_request_sense(qc); 2564 return; 2565 } else if (unlikely(err_mask)) { 2566 /* FIXME: not quite right; we don't want the 2567 * translation of taskfile registers into 2568 * a sense descriptors, since that's only 2569 * correct for ATA, not ATAPI 2570 */ 2571 ata_gen_passthru_sense(qc); 2572 } else { 2573 u8 *scsicmd = cmd->cmnd; 2574 2575 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2576 unsigned long flags; 2577 u8 *buf; 2578 2579 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2580 2581 /* ATAPI devices typically report zero for their SCSI version, 2582 * and sometimes deviate from the spec WRT response data 2583 * format. If SCSI version is reported as zero like normal, 2584 * then we make the following fixups: 1) Fake MMC-5 version, 2585 * to indicate to the Linux scsi midlayer this is a modern 2586 * device. 2) Ensure response data format / ATAPI information 2587 * are always correct. 2588 */ 2589 if (buf[2] == 0) { 2590 buf[2] = 0x5; 2591 buf[3] = 0x32; 2592 } 2593 2594 ata_scsi_rbuf_put(cmd, true, &flags); 2595 } 2596 2597 cmd->result = SAM_STAT_GOOD; 2598 } 2599 2600 qc->scsidone(cmd); 2601 ata_qc_free(qc); 2602 } 2603 /** 2604 * atapi_xlat - Initialize PACKET taskfile 2605 * @qc: command structure to be initialized 2606 * 2607 * LOCKING: 2608 * spin_lock_irqsave(host lock) 2609 * 2610 * RETURNS: 2611 * Zero on success, non-zero on failure. 2612 */ 2613 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2614 { 2615 struct scsi_cmnd *scmd = qc->scsicmd; 2616 struct ata_device *dev = qc->dev; 2617 int nodata = (scmd->sc_data_direction == DMA_NONE); 2618 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2619 unsigned int nbytes; 2620 2621 memset(qc->cdb, 0, dev->cdb_len); 2622 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2623 2624 qc->complete_fn = atapi_qc_complete; 2625 2626 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2627 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2628 qc->tf.flags |= ATA_TFLAG_WRITE; 2629 DPRINTK("direction: write\n"); 2630 } 2631 2632 qc->tf.command = ATA_CMD_PACKET; 2633 ata_qc_set_pc_nbytes(qc); 2634 2635 /* check whether ATAPI DMA is safe */ 2636 if (!nodata && !using_pio && atapi_check_dma(qc)) 2637 using_pio = 1; 2638 2639 /* Some controller variants snoop this value for Packet 2640 * transfers to do state machine and FIFO management. Thus we 2641 * want to set it properly, and for DMA where it is 2642 * effectively meaningless. 2643 */ 2644 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2645 2646 /* Most ATAPI devices which honor transfer chunk size don't 2647 * behave according to the spec when odd chunk size which 2648 * matches the transfer length is specified. If the number of 2649 * bytes to transfer is 2n+1. According to the spec, what 2650 * should happen is to indicate that 2n+1 is going to be 2651 * transferred and transfer 2n+2 bytes where the last byte is 2652 * padding. 2653 * 2654 * In practice, this doesn't happen. ATAPI devices first 2655 * indicate and transfer 2n bytes and then indicate and 2656 * transfer 2 bytes where the last byte is padding. 2657 * 2658 * This inconsistency confuses several controllers which 2659 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2660 * These controllers use actual number of transferred bytes to 2661 * update DMA poitner and transfer of 4n+2 bytes make those 2662 * controller push DMA pointer by 4n+4 bytes because SATA data 2663 * FISes are aligned to 4 bytes. This causes data corruption 2664 * and buffer overrun. 2665 * 2666 * Always setting nbytes to even number solves this problem 2667 * because then ATAPI devices don't have to split data at 2n 2668 * boundaries. 2669 */ 2670 if (nbytes & 0x1) 2671 nbytes++; 2672 2673 qc->tf.lbam = (nbytes & 0xFF); 2674 qc->tf.lbah = (nbytes >> 8); 2675 2676 if (nodata) 2677 qc->tf.protocol = ATAPI_PROT_NODATA; 2678 else if (using_pio) 2679 qc->tf.protocol = ATAPI_PROT_PIO; 2680 else { 2681 /* DMA data xfer */ 2682 qc->tf.protocol = ATAPI_PROT_DMA; 2683 qc->tf.feature |= ATAPI_PKT_DMA; 2684 2685 if ((dev->flags & ATA_DFLAG_DMADIR) && 2686 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2687 /* some SATA bridges need us to indicate data xfer direction */ 2688 qc->tf.feature |= ATAPI_DMADIR; 2689 } 2690 2691 2692 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2693 as ATAPI tape drives don't get this right otherwise */ 2694 return 0; 2695 } 2696 2697 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2698 { 2699 if (!sata_pmp_attached(ap)) { 2700 if (likely(devno < ata_link_max_devices(&ap->link))) 2701 return &ap->link.device[devno]; 2702 } else { 2703 if (likely(devno < ap->nr_pmp_links)) 2704 return &ap->pmp_link[devno].device[0]; 2705 } 2706 2707 return NULL; 2708 } 2709 2710 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2711 const struct scsi_device *scsidev) 2712 { 2713 int devno; 2714 2715 /* skip commands not addressed to targets we simulate */ 2716 if (!sata_pmp_attached(ap)) { 2717 if (unlikely(scsidev->channel || scsidev->lun)) 2718 return NULL; 2719 devno = scsidev->id; 2720 } else { 2721 if (unlikely(scsidev->id || scsidev->lun)) 2722 return NULL; 2723 devno = scsidev->channel; 2724 } 2725 2726 return ata_find_dev(ap, devno); 2727 } 2728 2729 /** 2730 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2731 * @ap: ATA port to which the device is attached 2732 * @scsidev: SCSI device from which we derive the ATA device 2733 * 2734 * Given various information provided in struct scsi_cmnd, 2735 * map that onto an ATA bus, and using that mapping 2736 * determine which ata_device is associated with the 2737 * SCSI command to be sent. 2738 * 2739 * LOCKING: 2740 * spin_lock_irqsave(host lock) 2741 * 2742 * RETURNS: 2743 * Associated ATA device, or %NULL if not found. 2744 */ 2745 static struct ata_device * 2746 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2747 { 2748 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2749 2750 if (unlikely(!dev || !ata_dev_enabled(dev))) 2751 return NULL; 2752 2753 return dev; 2754 } 2755 2756 /* 2757 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2758 * @byte1: Byte 1 from pass-thru CDB. 2759 * 2760 * RETURNS: 2761 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2762 */ 2763 static u8 2764 ata_scsi_map_proto(u8 byte1) 2765 { 2766 switch((byte1 & 0x1e) >> 1) { 2767 case 3: /* Non-data */ 2768 return ATA_PROT_NODATA; 2769 2770 case 6: /* DMA */ 2771 case 10: /* UDMA Data-in */ 2772 case 11: /* UDMA Data-Out */ 2773 return ATA_PROT_DMA; 2774 2775 case 4: /* PIO Data-in */ 2776 case 5: /* PIO Data-out */ 2777 return ATA_PROT_PIO; 2778 2779 case 0: /* Hard Reset */ 2780 case 1: /* SRST */ 2781 case 8: /* Device Diagnostic */ 2782 case 9: /* Device Reset */ 2783 case 7: /* DMA Queued */ 2784 case 12: /* FPDMA */ 2785 case 15: /* Return Response Info */ 2786 default: /* Reserved */ 2787 break; 2788 } 2789 2790 return ATA_PROT_UNKNOWN; 2791 } 2792 2793 /** 2794 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2795 * @qc: command structure to be initialized 2796 * 2797 * Handles either 12 or 16-byte versions of the CDB. 2798 * 2799 * RETURNS: 2800 * Zero on success, non-zero on failure. 2801 */ 2802 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2803 { 2804 struct ata_taskfile *tf = &(qc->tf); 2805 struct scsi_cmnd *scmd = qc->scsicmd; 2806 struct ata_device *dev = qc->dev; 2807 const u8 *cdb = scmd->cmnd; 2808 2809 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2810 goto invalid_fld; 2811 2812 /* 2813 * 12 and 16 byte CDBs use different offsets to 2814 * provide the various register values. 2815 */ 2816 if (cdb[0] == ATA_16) { 2817 /* 2818 * 16-byte CDB - may contain extended commands. 2819 * 2820 * If that is the case, copy the upper byte register values. 2821 */ 2822 if (cdb[1] & 0x01) { 2823 tf->hob_feature = cdb[3]; 2824 tf->hob_nsect = cdb[5]; 2825 tf->hob_lbal = cdb[7]; 2826 tf->hob_lbam = cdb[9]; 2827 tf->hob_lbah = cdb[11]; 2828 tf->flags |= ATA_TFLAG_LBA48; 2829 } else 2830 tf->flags &= ~ATA_TFLAG_LBA48; 2831 2832 /* 2833 * Always copy low byte, device and command registers. 2834 */ 2835 tf->feature = cdb[4]; 2836 tf->nsect = cdb[6]; 2837 tf->lbal = cdb[8]; 2838 tf->lbam = cdb[10]; 2839 tf->lbah = cdb[12]; 2840 tf->device = cdb[13]; 2841 tf->command = cdb[14]; 2842 } else { 2843 /* 2844 * 12-byte CDB - incapable of extended commands. 2845 */ 2846 tf->flags &= ~ATA_TFLAG_LBA48; 2847 2848 tf->feature = cdb[3]; 2849 tf->nsect = cdb[4]; 2850 tf->lbal = cdb[5]; 2851 tf->lbam = cdb[6]; 2852 tf->lbah = cdb[7]; 2853 tf->device = cdb[8]; 2854 tf->command = cdb[9]; 2855 } 2856 2857 /* enforce correct master/slave bit */ 2858 tf->device = dev->devno ? 2859 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2860 2861 /* READ/WRITE LONG use a non-standard sect_size */ 2862 qc->sect_size = ATA_SECT_SIZE; 2863 switch (tf->command) { 2864 case ATA_CMD_READ_LONG: 2865 case ATA_CMD_READ_LONG_ONCE: 2866 case ATA_CMD_WRITE_LONG: 2867 case ATA_CMD_WRITE_LONG_ONCE: 2868 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2869 goto invalid_fld; 2870 qc->sect_size = scsi_bufflen(scmd); 2871 } 2872 2873 /* 2874 * Set flags so that all registers will be written, pass on 2875 * write indication (used for PIO/DMA setup), result TF is 2876 * copied back and we don't whine too much about its failure. 2877 */ 2878 tf->flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2879 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2880 tf->flags |= ATA_TFLAG_WRITE; 2881 2882 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2883 2884 /* 2885 * Set transfer length. 2886 * 2887 * TODO: find out if we need to do more here to 2888 * cover scatter/gather case. 2889 */ 2890 ata_qc_set_pc_nbytes(qc); 2891 2892 /* We may not issue DMA commands if no DMA mode is set */ 2893 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2894 goto invalid_fld; 2895 2896 /* sanity check for pio multi commands */ 2897 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2898 goto invalid_fld; 2899 2900 if (is_multi_taskfile(tf)) { 2901 unsigned int multi_count = 1 << (cdb[1] >> 5); 2902 2903 /* compare the passed through multi_count 2904 * with the cached multi_count of libata 2905 */ 2906 if (multi_count != dev->multi_count) 2907 ata_dev_printk(dev, KERN_WARNING, 2908 "invalid multi_count %u ignored\n", 2909 multi_count); 2910 } 2911 2912 /* 2913 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2914 * SET_FEATURES - XFER MODE must be preceded/succeeded 2915 * by an update to hardware-specific registers for each 2916 * controller (i.e. the reason for ->set_piomode(), 2917 * ->set_dmamode(), and ->post_set_mode() hooks). 2918 */ 2919 if (tf->command == ATA_CMD_SET_FEATURES && 2920 tf->feature == SETFEATURES_XFER) 2921 goto invalid_fld; 2922 2923 /* 2924 * Filter TPM commands by default. These provide an 2925 * essentially uncontrolled encrypted "back door" between 2926 * applications and the disk. Set libata.allow_tpm=1 if you 2927 * have a real reason for wanting to use them. This ensures 2928 * that installed software cannot easily mess stuff up without 2929 * user intent. DVR type users will probably ship with this enabled 2930 * for movie content management. 2931 * 2932 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2933 * for this and should do in future but that it is not sufficient as 2934 * DCS is an optional feature set. Thus we also do the software filter 2935 * so that we comply with the TC consortium stated goal that the user 2936 * can turn off TC features of their system. 2937 */ 2938 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2939 goto invalid_fld; 2940 2941 return 0; 2942 2943 invalid_fld: 2944 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2945 /* "Invalid field in cdb" */ 2946 return 1; 2947 } 2948 2949 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 2950 { 2951 struct ata_taskfile *tf = &qc->tf; 2952 struct scsi_cmnd *scmd = qc->scsicmd; 2953 struct ata_device *dev = qc->dev; 2954 const u8 *cdb = scmd->cmnd; 2955 u64 block; 2956 u32 n_block; 2957 u32 size; 2958 void *buf; 2959 2960 /* we may not issue DMA commands if no DMA mode is set */ 2961 if (unlikely(!dev->dma_mode)) 2962 goto invalid_fld; 2963 2964 if (unlikely(scmd->cmd_len < 16)) 2965 goto invalid_fld; 2966 scsi_16_lba_len(cdb, &block, &n_block); 2967 2968 /* for now we only support WRITE SAME with the unmap bit set */ 2969 if (unlikely(!(cdb[1] & 0x8))) 2970 goto invalid_fld; 2971 2972 /* 2973 * WRITE SAME always has a sector sized buffer as payload, this 2974 * should never be a multiple entry S/G list. 2975 */ 2976 if (!scsi_sg_count(scmd)) 2977 goto invalid_fld; 2978 2979 buf = page_address(sg_page(scsi_sglist(scmd))); 2980 size = ata_set_lba_range_entries(buf, 512, block, n_block); 2981 2982 tf->protocol = ATA_PROT_DMA; 2983 tf->hob_feature = 0; 2984 tf->feature = ATA_DSM_TRIM; 2985 tf->hob_nsect = (size / 512) >> 8; 2986 tf->nsect = size / 512; 2987 tf->command = ATA_CMD_DSM; 2988 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 2989 ATA_TFLAG_WRITE; 2990 2991 ata_qc_set_pc_nbytes(qc); 2992 2993 return 0; 2994 2995 invalid_fld: 2996 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2997 /* "Invalid field in cdb" */ 2998 return 1; 2999 } 3000 3001 /** 3002 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3003 * @dev: ATA device 3004 * @cmd: SCSI command opcode to consider 3005 * 3006 * Look up the SCSI command given, and determine whether the 3007 * SCSI command is to be translated or simulated. 3008 * 3009 * RETURNS: 3010 * Pointer to translation function if possible, %NULL if not. 3011 */ 3012 3013 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3014 { 3015 switch (cmd) { 3016 case READ_6: 3017 case READ_10: 3018 case READ_16: 3019 3020 case WRITE_6: 3021 case WRITE_10: 3022 case WRITE_16: 3023 return ata_scsi_rw_xlat; 3024 3025 case WRITE_SAME_16: 3026 return ata_scsi_write_same_xlat; 3027 3028 case SYNCHRONIZE_CACHE: 3029 if (ata_try_flush_cache(dev)) 3030 return ata_scsi_flush_xlat; 3031 break; 3032 3033 case VERIFY: 3034 case VERIFY_16: 3035 return ata_scsi_verify_xlat; 3036 3037 case ATA_12: 3038 case ATA_16: 3039 return ata_scsi_pass_thru; 3040 3041 case START_STOP: 3042 return ata_scsi_start_stop_xlat; 3043 } 3044 3045 return NULL; 3046 } 3047 3048 /** 3049 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3050 * @ap: ATA port to which the command was being sent 3051 * @cmd: SCSI command to dump 3052 * 3053 * Prints the contents of a SCSI command via printk(). 3054 */ 3055 3056 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3057 struct scsi_cmnd *cmd) 3058 { 3059 #ifdef ATA_DEBUG 3060 struct scsi_device *scsidev = cmd->device; 3061 u8 *scsicmd = cmd->cmnd; 3062 3063 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3064 ap->print_id, 3065 scsidev->channel, scsidev->id, scsidev->lun, 3066 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3067 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3068 scsicmd[8]); 3069 #endif 3070 } 3071 3072 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3073 void (*done)(struct scsi_cmnd *), 3074 struct ata_device *dev) 3075 { 3076 u8 scsi_op = scmd->cmnd[0]; 3077 ata_xlat_func_t xlat_func; 3078 int rc = 0; 3079 3080 if (dev->class == ATA_DEV_ATA) { 3081 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3082 goto bad_cdb_len; 3083 3084 xlat_func = ata_get_xlat_func(dev, scsi_op); 3085 } else { 3086 if (unlikely(!scmd->cmd_len)) 3087 goto bad_cdb_len; 3088 3089 xlat_func = NULL; 3090 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3091 /* relay SCSI command to ATAPI device */ 3092 int len = COMMAND_SIZE(scsi_op); 3093 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3094 goto bad_cdb_len; 3095 3096 xlat_func = atapi_xlat; 3097 } else { 3098 /* ATA_16 passthru, treat as an ATA command */ 3099 if (unlikely(scmd->cmd_len > 16)) 3100 goto bad_cdb_len; 3101 3102 xlat_func = ata_get_xlat_func(dev, scsi_op); 3103 } 3104 } 3105 3106 if (xlat_func) 3107 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3108 else 3109 ata_scsi_simulate(dev, scmd, done); 3110 3111 return rc; 3112 3113 bad_cdb_len: 3114 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3115 scmd->cmd_len, scsi_op, dev->cdb_len); 3116 scmd->result = DID_ERROR << 16; 3117 done(scmd); 3118 return 0; 3119 } 3120 3121 /** 3122 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3123 * @cmd: SCSI command to be sent 3124 * @done: Completion function, called when command is complete 3125 * 3126 * In some cases, this function translates SCSI commands into 3127 * ATA taskfiles, and queues the taskfiles to be sent to 3128 * hardware. In other cases, this function simulates a 3129 * SCSI device by evaluating and responding to certain 3130 * SCSI commands. This creates the overall effect of 3131 * ATA and ATAPI devices appearing as SCSI devices. 3132 * 3133 * LOCKING: 3134 * Releases scsi-layer-held lock, and obtains host lock. 3135 * 3136 * RETURNS: 3137 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3138 * 0 otherwise. 3139 */ 3140 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3141 { 3142 struct ata_port *ap; 3143 struct ata_device *dev; 3144 struct scsi_device *scsidev = cmd->device; 3145 struct Scsi_Host *shost = scsidev->host; 3146 int rc = 0; 3147 3148 ap = ata_shost_to_port(shost); 3149 3150 spin_unlock(shost->host_lock); 3151 spin_lock(ap->lock); 3152 3153 ata_scsi_dump_cdb(ap, cmd); 3154 3155 dev = ata_scsi_find_dev(ap, scsidev); 3156 if (likely(dev)) 3157 rc = __ata_scsi_queuecmd(cmd, done, dev); 3158 else { 3159 cmd->result = (DID_BAD_TARGET << 16); 3160 done(cmd); 3161 } 3162 3163 spin_unlock(ap->lock); 3164 spin_lock(shost->host_lock); 3165 return rc; 3166 } 3167 3168 /** 3169 * ata_scsi_simulate - simulate SCSI command on ATA device 3170 * @dev: the target device 3171 * @cmd: SCSI command being sent to device. 3172 * @done: SCSI command completion function. 3173 * 3174 * Interprets and directly executes a select list of SCSI commands 3175 * that can be handled internally. 3176 * 3177 * LOCKING: 3178 * spin_lock_irqsave(host lock) 3179 */ 3180 3181 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3182 void (*done)(struct scsi_cmnd *)) 3183 { 3184 struct ata_scsi_args args; 3185 const u8 *scsicmd = cmd->cmnd; 3186 u8 tmp8; 3187 3188 args.dev = dev; 3189 args.id = dev->id; 3190 args.cmd = cmd; 3191 args.done = done; 3192 3193 switch(scsicmd[0]) { 3194 /* TODO: worth improving? */ 3195 case FORMAT_UNIT: 3196 ata_scsi_invalid_field(cmd, done); 3197 break; 3198 3199 case INQUIRY: 3200 if (scsicmd[1] & 2) /* is CmdDt set? */ 3201 ata_scsi_invalid_field(cmd, done); 3202 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3203 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3204 else switch (scsicmd[2]) { 3205 case 0x00: 3206 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3207 break; 3208 case 0x80: 3209 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3210 break; 3211 case 0x83: 3212 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3213 break; 3214 case 0x89: 3215 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3216 break; 3217 case 0xb0: 3218 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3219 break; 3220 case 0xb1: 3221 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3222 break; 3223 default: 3224 ata_scsi_invalid_field(cmd, done); 3225 break; 3226 } 3227 break; 3228 3229 case MODE_SENSE: 3230 case MODE_SENSE_10: 3231 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3232 break; 3233 3234 case MODE_SELECT: /* unconditionally return */ 3235 case MODE_SELECT_10: /* bad-field-in-cdb */ 3236 ata_scsi_invalid_field(cmd, done); 3237 break; 3238 3239 case READ_CAPACITY: 3240 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3241 break; 3242 3243 case SERVICE_ACTION_IN: 3244 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3245 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3246 else 3247 ata_scsi_invalid_field(cmd, done); 3248 break; 3249 3250 case REPORT_LUNS: 3251 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3252 break; 3253 3254 case REQUEST_SENSE: 3255 ata_scsi_set_sense(cmd, 0, 0, 0); 3256 cmd->result = (DRIVER_SENSE << 24); 3257 done(cmd); 3258 break; 3259 3260 /* if we reach this, then writeback caching is disabled, 3261 * turning this into a no-op. 3262 */ 3263 case SYNCHRONIZE_CACHE: 3264 /* fall through */ 3265 3266 /* no-op's, complete with success */ 3267 case REZERO_UNIT: 3268 case SEEK_6: 3269 case SEEK_10: 3270 case TEST_UNIT_READY: 3271 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3272 break; 3273 3274 case SEND_DIAGNOSTIC: 3275 tmp8 = scsicmd[1] & ~(1 << 3); 3276 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3277 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3278 else 3279 ata_scsi_invalid_field(cmd, done); 3280 break; 3281 3282 /* all other commands */ 3283 default: 3284 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3285 /* "Invalid command operation code" */ 3286 done(cmd); 3287 break; 3288 } 3289 } 3290 3291 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3292 { 3293 int i, rc; 3294 3295 for (i = 0; i < host->n_ports; i++) { 3296 struct ata_port *ap = host->ports[i]; 3297 struct Scsi_Host *shost; 3298 3299 rc = -ENOMEM; 3300 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3301 if (!shost) 3302 goto err_alloc; 3303 3304 *(struct ata_port **)&shost->hostdata[0] = ap; 3305 ap->scsi_host = shost; 3306 3307 shost->transportt = &ata_scsi_transport_template; 3308 shost->unique_id = ap->print_id; 3309 shost->max_id = 16; 3310 shost->max_lun = 1; 3311 shost->max_channel = 1; 3312 shost->max_cmd_len = 16; 3313 3314 /* Schedule policy is determined by ->qc_defer() 3315 * callback and it needs to see every deferred qc. 3316 * Set host_blocked to 1 to prevent SCSI midlayer from 3317 * automatically deferring requests. 3318 */ 3319 shost->max_host_blocked = 1; 3320 3321 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3322 if (rc) 3323 goto err_add; 3324 } 3325 3326 return 0; 3327 3328 err_add: 3329 scsi_host_put(host->ports[i]->scsi_host); 3330 err_alloc: 3331 while (--i >= 0) { 3332 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3333 3334 scsi_remove_host(shost); 3335 scsi_host_put(shost); 3336 } 3337 return rc; 3338 } 3339 3340 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3341 { 3342 int tries = 5; 3343 struct ata_device *last_failed_dev = NULL; 3344 struct ata_link *link; 3345 struct ata_device *dev; 3346 3347 if (ap->flags & ATA_FLAG_DISABLED) 3348 return; 3349 3350 repeat: 3351 ata_for_each_link(link, ap, EDGE) { 3352 ata_for_each_dev(dev, link, ENABLED) { 3353 struct scsi_device *sdev; 3354 int channel = 0, id = 0; 3355 3356 if (dev->sdev) 3357 continue; 3358 3359 if (ata_is_host_link(link)) 3360 id = dev->devno; 3361 else 3362 channel = link->pmp; 3363 3364 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3365 NULL); 3366 if (!IS_ERR(sdev)) { 3367 dev->sdev = sdev; 3368 scsi_device_put(sdev); 3369 } 3370 } 3371 } 3372 3373 /* If we scanned while EH was in progress or allocation 3374 * failure occurred, scan would have failed silently. Check 3375 * whether all devices are attached. 3376 */ 3377 ata_for_each_link(link, ap, EDGE) { 3378 ata_for_each_dev(dev, link, ENABLED) { 3379 if (!dev->sdev) 3380 goto exit_loop; 3381 } 3382 } 3383 exit_loop: 3384 if (!link) 3385 return; 3386 3387 /* we're missing some SCSI devices */ 3388 if (sync) { 3389 /* If caller requested synchrnous scan && we've made 3390 * any progress, sleep briefly and repeat. 3391 */ 3392 if (dev != last_failed_dev) { 3393 msleep(100); 3394 last_failed_dev = dev; 3395 goto repeat; 3396 } 3397 3398 /* We might be failing to detect boot device, give it 3399 * a few more chances. 3400 */ 3401 if (--tries) { 3402 msleep(100); 3403 goto repeat; 3404 } 3405 3406 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3407 "failed without making any progress,\n" 3408 " switching to async\n"); 3409 } 3410 3411 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3412 round_jiffies_relative(HZ)); 3413 } 3414 3415 /** 3416 * ata_scsi_offline_dev - offline attached SCSI device 3417 * @dev: ATA device to offline attached SCSI device for 3418 * 3419 * This function is called from ata_eh_hotplug() and responsible 3420 * for taking the SCSI device attached to @dev offline. This 3421 * function is called with host lock which protects dev->sdev 3422 * against clearing. 3423 * 3424 * LOCKING: 3425 * spin_lock_irqsave(host lock) 3426 * 3427 * RETURNS: 3428 * 1 if attached SCSI device exists, 0 otherwise. 3429 */ 3430 int ata_scsi_offline_dev(struct ata_device *dev) 3431 { 3432 if (dev->sdev) { 3433 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3434 return 1; 3435 } 3436 return 0; 3437 } 3438 3439 /** 3440 * ata_scsi_remove_dev - remove attached SCSI device 3441 * @dev: ATA device to remove attached SCSI device for 3442 * 3443 * This function is called from ata_eh_scsi_hotplug() and 3444 * responsible for removing the SCSI device attached to @dev. 3445 * 3446 * LOCKING: 3447 * Kernel thread context (may sleep). 3448 */ 3449 static void ata_scsi_remove_dev(struct ata_device *dev) 3450 { 3451 struct ata_port *ap = dev->link->ap; 3452 struct scsi_device *sdev; 3453 unsigned long flags; 3454 3455 /* Alas, we need to grab scan_mutex to ensure SCSI device 3456 * state doesn't change underneath us and thus 3457 * scsi_device_get() always succeeds. The mutex locking can 3458 * be removed if there is __scsi_device_get() interface which 3459 * increments reference counts regardless of device state. 3460 */ 3461 mutex_lock(&ap->scsi_host->scan_mutex); 3462 spin_lock_irqsave(ap->lock, flags); 3463 3464 /* clearing dev->sdev is protected by host lock */ 3465 sdev = dev->sdev; 3466 dev->sdev = NULL; 3467 3468 if (sdev) { 3469 /* If user initiated unplug races with us, sdev can go 3470 * away underneath us after the host lock and 3471 * scan_mutex are released. Hold onto it. 3472 */ 3473 if (scsi_device_get(sdev) == 0) { 3474 /* The following ensures the attached sdev is 3475 * offline on return from ata_scsi_offline_dev() 3476 * regardless it wins or loses the race 3477 * against this function. 3478 */ 3479 scsi_device_set_state(sdev, SDEV_OFFLINE); 3480 } else { 3481 WARN_ON(1); 3482 sdev = NULL; 3483 } 3484 } 3485 3486 spin_unlock_irqrestore(ap->lock, flags); 3487 mutex_unlock(&ap->scsi_host->scan_mutex); 3488 3489 if (sdev) { 3490 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3491 dev_name(&sdev->sdev_gendev)); 3492 3493 scsi_remove_device(sdev); 3494 scsi_device_put(sdev); 3495 } 3496 } 3497 3498 static void ata_scsi_handle_link_detach(struct ata_link *link) 3499 { 3500 struct ata_port *ap = link->ap; 3501 struct ata_device *dev; 3502 3503 ata_for_each_dev(dev, link, ALL) { 3504 unsigned long flags; 3505 3506 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3507 continue; 3508 3509 spin_lock_irqsave(ap->lock, flags); 3510 dev->flags &= ~ATA_DFLAG_DETACHED; 3511 spin_unlock_irqrestore(ap->lock, flags); 3512 3513 ata_scsi_remove_dev(dev); 3514 } 3515 } 3516 3517 /** 3518 * ata_scsi_media_change_notify - send media change event 3519 * @dev: Pointer to the disk device with media change event 3520 * 3521 * Tell the block layer to send a media change notification 3522 * event. 3523 * 3524 * LOCKING: 3525 * spin_lock_irqsave(host lock) 3526 */ 3527 void ata_scsi_media_change_notify(struct ata_device *dev) 3528 { 3529 if (dev->sdev) 3530 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3531 GFP_ATOMIC); 3532 } 3533 3534 /** 3535 * ata_scsi_hotplug - SCSI part of hotplug 3536 * @work: Pointer to ATA port to perform SCSI hotplug on 3537 * 3538 * Perform SCSI part of hotplug. It's executed from a separate 3539 * workqueue after EH completes. This is necessary because SCSI 3540 * hot plugging requires working EH and hot unplugging is 3541 * synchronized with hot plugging with a mutex. 3542 * 3543 * LOCKING: 3544 * Kernel thread context (may sleep). 3545 */ 3546 void ata_scsi_hotplug(struct work_struct *work) 3547 { 3548 struct ata_port *ap = 3549 container_of(work, struct ata_port, hotplug_task.work); 3550 int i; 3551 3552 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3553 DPRINTK("ENTER/EXIT - unloading\n"); 3554 return; 3555 } 3556 3557 DPRINTK("ENTER\n"); 3558 3559 /* Unplug detached devices. We cannot use link iterator here 3560 * because PMP links have to be scanned even if PMP is 3561 * currently not attached. Iterate manually. 3562 */ 3563 ata_scsi_handle_link_detach(&ap->link); 3564 if (ap->pmp_link) 3565 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3566 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3567 3568 /* scan for new ones */ 3569 ata_scsi_scan_host(ap, 0); 3570 3571 DPRINTK("EXIT\n"); 3572 } 3573 3574 /** 3575 * ata_scsi_user_scan - indication for user-initiated bus scan 3576 * @shost: SCSI host to scan 3577 * @channel: Channel to scan 3578 * @id: ID to scan 3579 * @lun: LUN to scan 3580 * 3581 * This function is called when user explicitly requests bus 3582 * scan. Set probe pending flag and invoke EH. 3583 * 3584 * LOCKING: 3585 * SCSI layer (we don't care) 3586 * 3587 * RETURNS: 3588 * Zero. 3589 */ 3590 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3591 unsigned int id, unsigned int lun) 3592 { 3593 struct ata_port *ap = ata_shost_to_port(shost); 3594 unsigned long flags; 3595 int devno, rc = 0; 3596 3597 if (!ap->ops->error_handler) 3598 return -EOPNOTSUPP; 3599 3600 if (lun != SCAN_WILD_CARD && lun) 3601 return -EINVAL; 3602 3603 if (!sata_pmp_attached(ap)) { 3604 if (channel != SCAN_WILD_CARD && channel) 3605 return -EINVAL; 3606 devno = id; 3607 } else { 3608 if (id != SCAN_WILD_CARD && id) 3609 return -EINVAL; 3610 devno = channel; 3611 } 3612 3613 spin_lock_irqsave(ap->lock, flags); 3614 3615 if (devno == SCAN_WILD_CARD) { 3616 struct ata_link *link; 3617 3618 ata_for_each_link(link, ap, EDGE) { 3619 struct ata_eh_info *ehi = &link->eh_info; 3620 ehi->probe_mask |= ATA_ALL_DEVICES; 3621 ehi->action |= ATA_EH_RESET; 3622 } 3623 } else { 3624 struct ata_device *dev = ata_find_dev(ap, devno); 3625 3626 if (dev) { 3627 struct ata_eh_info *ehi = &dev->link->eh_info; 3628 ehi->probe_mask |= 1 << dev->devno; 3629 ehi->action |= ATA_EH_RESET; 3630 } else 3631 rc = -EINVAL; 3632 } 3633 3634 if (rc == 0) { 3635 ata_port_schedule_eh(ap); 3636 spin_unlock_irqrestore(ap->lock, flags); 3637 ata_port_wait_eh(ap); 3638 } else 3639 spin_unlock_irqrestore(ap->lock, flags); 3640 3641 return rc; 3642 } 3643 3644 /** 3645 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3646 * @work: Pointer to ATA port to perform scsi_rescan_device() 3647 * 3648 * After ATA pass thru (SAT) commands are executed successfully, 3649 * libata need to propagate the changes to SCSI layer. This 3650 * function must be executed from ata_aux_wq such that sdev 3651 * attach/detach don't race with rescan. 3652 * 3653 * LOCKING: 3654 * Kernel thread context (may sleep). 3655 */ 3656 void ata_scsi_dev_rescan(struct work_struct *work) 3657 { 3658 struct ata_port *ap = 3659 container_of(work, struct ata_port, scsi_rescan_task); 3660 struct ata_link *link; 3661 struct ata_device *dev; 3662 unsigned long flags; 3663 3664 spin_lock_irqsave(ap->lock, flags); 3665 3666 ata_for_each_link(link, ap, EDGE) { 3667 ata_for_each_dev(dev, link, ENABLED) { 3668 struct scsi_device *sdev = dev->sdev; 3669 3670 if (!sdev) 3671 continue; 3672 if (scsi_device_get(sdev)) 3673 continue; 3674 3675 spin_unlock_irqrestore(ap->lock, flags); 3676 scsi_rescan_device(&(sdev->sdev_gendev)); 3677 scsi_device_put(sdev); 3678 spin_lock_irqsave(ap->lock, flags); 3679 } 3680 } 3681 3682 spin_unlock_irqrestore(ap->lock, flags); 3683 } 3684 3685 /** 3686 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3687 * @host: ATA host container for all SAS ports 3688 * @port_info: Information from low-level host driver 3689 * @shost: SCSI host that the scsi device is attached to 3690 * 3691 * LOCKING: 3692 * PCI/etc. bus probe sem. 3693 * 3694 * RETURNS: 3695 * ata_port pointer on success / NULL on failure. 3696 */ 3697 3698 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3699 struct ata_port_info *port_info, 3700 struct Scsi_Host *shost) 3701 { 3702 struct ata_port *ap; 3703 3704 ap = ata_port_alloc(host); 3705 if (!ap) 3706 return NULL; 3707 3708 ap->port_no = 0; 3709 ap->lock = shost->host_lock; 3710 ap->pio_mask = port_info->pio_mask; 3711 ap->mwdma_mask = port_info->mwdma_mask; 3712 ap->udma_mask = port_info->udma_mask; 3713 ap->flags |= port_info->flags; 3714 ap->ops = port_info->port_ops; 3715 ap->cbl = ATA_CBL_SATA; 3716 3717 return ap; 3718 } 3719 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3720 3721 /** 3722 * ata_sas_port_start - Set port up for dma. 3723 * @ap: Port to initialize 3724 * 3725 * Called just after data structures for each port are 3726 * initialized. 3727 * 3728 * May be used as the port_start() entry in ata_port_operations. 3729 * 3730 * LOCKING: 3731 * Inherited from caller. 3732 */ 3733 int ata_sas_port_start(struct ata_port *ap) 3734 { 3735 return 0; 3736 } 3737 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3738 3739 /** 3740 * ata_port_stop - Undo ata_sas_port_start() 3741 * @ap: Port to shut down 3742 * 3743 * May be used as the port_stop() entry in ata_port_operations. 3744 * 3745 * LOCKING: 3746 * Inherited from caller. 3747 */ 3748 3749 void ata_sas_port_stop(struct ata_port *ap) 3750 { 3751 } 3752 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3753 3754 /** 3755 * ata_sas_port_init - Initialize a SATA device 3756 * @ap: SATA port to initialize 3757 * 3758 * LOCKING: 3759 * PCI/etc. bus probe sem. 3760 * 3761 * RETURNS: 3762 * Zero on success, non-zero on error. 3763 */ 3764 3765 int ata_sas_port_init(struct ata_port *ap) 3766 { 3767 int rc = ap->ops->port_start(ap); 3768 3769 if (!rc) { 3770 ap->print_id = ata_print_id++; 3771 rc = ata_bus_probe(ap); 3772 } 3773 3774 return rc; 3775 } 3776 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3777 3778 /** 3779 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3780 * @ap: SATA port to destroy 3781 * 3782 */ 3783 3784 void ata_sas_port_destroy(struct ata_port *ap) 3785 { 3786 if (ap->ops->port_stop) 3787 ap->ops->port_stop(ap); 3788 kfree(ap); 3789 } 3790 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3791 3792 /** 3793 * ata_sas_slave_configure - Default slave_config routine for libata devices 3794 * @sdev: SCSI device to configure 3795 * @ap: ATA port to which SCSI device is attached 3796 * 3797 * RETURNS: 3798 * Zero. 3799 */ 3800 3801 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3802 { 3803 ata_scsi_sdev_config(sdev); 3804 ata_scsi_dev_config(sdev, ap->link.device); 3805 return 0; 3806 } 3807 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3808 3809 /** 3810 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3811 * @cmd: SCSI command to be sent 3812 * @done: Completion function, called when command is complete 3813 * @ap: ATA port to which the command is being sent 3814 * 3815 * RETURNS: 3816 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3817 * 0 otherwise. 3818 */ 3819 3820 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3821 struct ata_port *ap) 3822 { 3823 int rc = 0; 3824 3825 ata_scsi_dump_cdb(ap, cmd); 3826 3827 if (likely(ata_dev_enabled(ap->link.device))) 3828 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3829 else { 3830 cmd->result = (DID_BAD_TARGET << 16); 3831 done(cmd); 3832 } 3833 return rc; 3834 } 3835 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3836