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 51 #include "libata.h" 52 53 #define SECTOR_SIZE 512 54 #define ATA_SCSI_RBUF_SIZE 4096 55 56 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 57 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 58 59 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 60 61 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 62 const struct scsi_device *scsidev); 63 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 64 const struct scsi_device *scsidev); 65 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 66 unsigned int id, unsigned int lun); 67 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 /* 108 * libata transport template. libata doesn't do real transport stuff. 109 * It just needs the eh_timed_out hook. 110 */ 111 static struct scsi_transport_template ata_scsi_transport_template = { 112 .eh_strategy_handler = ata_scsi_error, 113 .eh_timed_out = ata_scsi_timed_out, 114 .user_scan = ata_scsi_user_scan, 115 }; 116 117 118 static const struct { 119 enum link_pm value; 120 const char *name; 121 } link_pm_policy[] = { 122 { NOT_AVAILABLE, "max_performance" }, 123 { MIN_POWER, "min_power" }, 124 { MAX_PERFORMANCE, "max_performance" }, 125 { MEDIUM_POWER, "medium_power" }, 126 }; 127 128 static const char *ata_scsi_lpm_get(enum link_pm policy) 129 { 130 int i; 131 132 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++) 133 if (link_pm_policy[i].value == policy) 134 return link_pm_policy[i].name; 135 136 return NULL; 137 } 138 139 static ssize_t ata_scsi_lpm_put(struct device *dev, 140 struct device_attribute *attr, 141 const char *buf, size_t count) 142 { 143 struct Scsi_Host *shost = class_to_shost(dev); 144 struct ata_port *ap = ata_shost_to_port(shost); 145 enum link_pm policy = 0; 146 int i; 147 148 /* 149 * we are skipping array location 0 on purpose - this 150 * is because a value of NOT_AVAILABLE is displayed 151 * to the user as max_performance, but when the user 152 * writes "max_performance", they actually want the 153 * value to match MAX_PERFORMANCE. 154 */ 155 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) { 156 const int len = strlen(link_pm_policy[i].name); 157 if (strncmp(link_pm_policy[i].name, buf, len) == 0 && 158 buf[len] == '\n') { 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_IWUGO, 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_IWUGO | 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 (!rq->data_len || (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 if (ata_id_is_ssd(dev->id)) 1123 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, 1124 sdev->request_queue); 1125 1126 /* ATA devices must be sector aligned */ 1127 blk_queue_update_dma_alignment(sdev->request_queue, 1128 ATA_SECT_SIZE - 1); 1129 sdev->manage_start_stop = 1; 1130 } 1131 1132 if (dev->flags & ATA_DFLAG_AN) 1133 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1134 1135 if (dev->flags & ATA_DFLAG_NCQ) { 1136 int depth; 1137 1138 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1139 depth = min(ATA_MAX_QUEUE - 1, depth); 1140 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1141 } 1142 1143 return 0; 1144 } 1145 1146 /** 1147 * ata_scsi_slave_config - Set SCSI device attributes 1148 * @sdev: SCSI device to examine 1149 * 1150 * This is called before we actually start reading 1151 * and writing to the device, to configure certain 1152 * SCSI mid-layer behaviors. 1153 * 1154 * LOCKING: 1155 * Defined by SCSI layer. We don't really care. 1156 */ 1157 1158 int ata_scsi_slave_config(struct scsi_device *sdev) 1159 { 1160 struct ata_port *ap = ata_shost_to_port(sdev->host); 1161 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1162 int rc = 0; 1163 1164 ata_scsi_sdev_config(sdev); 1165 1166 if (dev) 1167 rc = ata_scsi_dev_config(sdev, dev); 1168 1169 return rc; 1170 } 1171 1172 /** 1173 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1174 * @sdev: SCSI device to be destroyed 1175 * 1176 * @sdev is about to be destroyed for hot/warm unplugging. If 1177 * this unplugging was initiated by libata as indicated by NULL 1178 * dev->sdev, this function doesn't have to do anything. 1179 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1180 * Clear dev->sdev, schedule the device for ATA detach and invoke 1181 * EH. 1182 * 1183 * LOCKING: 1184 * Defined by SCSI layer. We don't really care. 1185 */ 1186 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1187 { 1188 struct ata_port *ap = ata_shost_to_port(sdev->host); 1189 struct request_queue *q = sdev->request_queue; 1190 unsigned long flags; 1191 struct ata_device *dev; 1192 1193 if (!ap->ops->error_handler) 1194 return; 1195 1196 spin_lock_irqsave(ap->lock, flags); 1197 dev = __ata_scsi_find_dev(ap, sdev); 1198 if (dev && dev->sdev) { 1199 /* SCSI device already in CANCEL state, no need to offline it */ 1200 dev->sdev = NULL; 1201 dev->flags |= ATA_DFLAG_DETACH; 1202 ata_port_schedule_eh(ap); 1203 } 1204 spin_unlock_irqrestore(ap->lock, flags); 1205 1206 kfree(q->dma_drain_buffer); 1207 q->dma_drain_buffer = NULL; 1208 q->dma_drain_size = 0; 1209 } 1210 1211 /** 1212 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1213 * @sdev: SCSI device to configure queue depth for 1214 * @queue_depth: new queue depth 1215 * 1216 * This is libata standard hostt->change_queue_depth callback. 1217 * SCSI will call into this callback when user tries to set queue 1218 * depth via sysfs. 1219 * 1220 * LOCKING: 1221 * SCSI layer (we don't care) 1222 * 1223 * RETURNS: 1224 * Newly configured queue depth. 1225 */ 1226 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1227 { 1228 struct ata_port *ap = ata_shost_to_port(sdev->host); 1229 struct ata_device *dev; 1230 unsigned long flags; 1231 1232 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1233 return sdev->queue_depth; 1234 1235 dev = ata_scsi_find_dev(ap, sdev); 1236 if (!dev || !ata_dev_enabled(dev)) 1237 return sdev->queue_depth; 1238 1239 /* NCQ enabled? */ 1240 spin_lock_irqsave(ap->lock, flags); 1241 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1242 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1243 dev->flags |= ATA_DFLAG_NCQ_OFF; 1244 queue_depth = 1; 1245 } 1246 spin_unlock_irqrestore(ap->lock, flags); 1247 1248 /* limit and apply queue depth */ 1249 queue_depth = min(queue_depth, sdev->host->can_queue); 1250 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1251 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1252 1253 if (sdev->queue_depth == queue_depth) 1254 return -EINVAL; 1255 1256 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1257 return queue_depth; 1258 } 1259 1260 /* XXX: for spindown warning */ 1261 static void ata_delayed_done_timerfn(unsigned long arg) 1262 { 1263 struct scsi_cmnd *scmd = (void *)arg; 1264 1265 scmd->scsi_done(scmd); 1266 } 1267 1268 /* XXX: for spindown warning */ 1269 static void ata_delayed_done(struct scsi_cmnd *scmd) 1270 { 1271 static struct timer_list timer; 1272 1273 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd); 1274 mod_timer(&timer, jiffies + 5 * HZ); 1275 } 1276 1277 /** 1278 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1279 * @qc: Storage for translated ATA taskfile 1280 * 1281 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1282 * (to start). Perhaps these commands should be preceded by 1283 * CHECK POWER MODE to see what power mode the device is already in. 1284 * [See SAT revision 5 at www.t10.org] 1285 * 1286 * LOCKING: 1287 * spin_lock_irqsave(host lock) 1288 * 1289 * RETURNS: 1290 * Zero on success, non-zero on error. 1291 */ 1292 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1293 { 1294 struct scsi_cmnd *scmd = qc->scsicmd; 1295 struct ata_taskfile *tf = &qc->tf; 1296 const u8 *cdb = scmd->cmnd; 1297 1298 if (scmd->cmd_len < 5) 1299 goto invalid_fld; 1300 1301 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1302 tf->protocol = ATA_PROT_NODATA; 1303 if (cdb[1] & 0x1) { 1304 ; /* ignore IMMED bit, violates sat-r05 */ 1305 } 1306 if (cdb[4] & 0x2) 1307 goto invalid_fld; /* LOEJ bit set not supported */ 1308 if (((cdb[4] >> 4) & 0xf) != 0) 1309 goto invalid_fld; /* power conditions not supported */ 1310 1311 if (cdb[4] & 0x1) { 1312 tf->nsect = 1; /* 1 sector, lba=0 */ 1313 1314 if (qc->dev->flags & ATA_DFLAG_LBA) { 1315 tf->flags |= ATA_TFLAG_LBA; 1316 1317 tf->lbah = 0x0; 1318 tf->lbam = 0x0; 1319 tf->lbal = 0x0; 1320 tf->device |= ATA_LBA; 1321 } else { 1322 /* CHS */ 1323 tf->lbal = 0x1; /* sect */ 1324 tf->lbam = 0x0; /* cyl low */ 1325 tf->lbah = 0x0; /* cyl high */ 1326 } 1327 1328 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1329 } else { 1330 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1331 * or S5) causing some drives to spin up and down again. 1332 */ 1333 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1334 system_state == SYSTEM_POWER_OFF) 1335 goto skip; 1336 1337 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1338 system_entering_hibernation()) 1339 goto skip; 1340 1341 /* XXX: This is for backward compatibility, will be 1342 * removed. Read Documentation/feature-removal-schedule.txt 1343 * for more info. 1344 */ 1345 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) && 1346 (system_state == SYSTEM_HALT || 1347 system_state == SYSTEM_POWER_OFF)) { 1348 static unsigned long warned; 1349 1350 if (!test_and_set_bit(0, &warned)) { 1351 ata_dev_printk(qc->dev, KERN_WARNING, 1352 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. " 1353 "UPDATE SHUTDOWN UTILITY\n"); 1354 ata_dev_printk(qc->dev, KERN_WARNING, 1355 "For more info, visit " 1356 "http://linux-ata.org/shutdown.html\n"); 1357 1358 /* ->scsi_done is not used, use it for 1359 * delayed completion. 1360 */ 1361 scmd->scsi_done = qc->scsidone; 1362 qc->scsidone = ata_delayed_done; 1363 } 1364 goto skip; 1365 } 1366 1367 /* Issue ATA STANDBY IMMEDIATE command */ 1368 tf->command = ATA_CMD_STANDBYNOW1; 1369 } 1370 1371 /* 1372 * Standby and Idle condition timers could be implemented but that 1373 * would require libata to implement the Power condition mode page 1374 * and allow the user to change it. Changing mode pages requires 1375 * MODE SELECT to be implemented. 1376 */ 1377 1378 return 0; 1379 1380 invalid_fld: 1381 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1382 /* "Invalid field in cbd" */ 1383 return 1; 1384 skip: 1385 scmd->result = SAM_STAT_GOOD; 1386 return 1; 1387 } 1388 1389 1390 /** 1391 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1392 * @qc: Storage for translated ATA taskfile 1393 * 1394 * Sets up an ATA taskfile to issue FLUSH CACHE or 1395 * FLUSH CACHE EXT. 1396 * 1397 * LOCKING: 1398 * spin_lock_irqsave(host lock) 1399 * 1400 * RETURNS: 1401 * Zero on success, non-zero on error. 1402 */ 1403 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1404 { 1405 struct ata_taskfile *tf = &qc->tf; 1406 1407 tf->flags |= ATA_TFLAG_DEVICE; 1408 tf->protocol = ATA_PROT_NODATA; 1409 1410 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1411 tf->command = ATA_CMD_FLUSH_EXT; 1412 else 1413 tf->command = ATA_CMD_FLUSH; 1414 1415 /* flush is critical for IO integrity, consider it an IO command */ 1416 qc->flags |= ATA_QCFLAG_IO; 1417 1418 return 0; 1419 } 1420 1421 /** 1422 * scsi_6_lba_len - Get LBA and transfer length 1423 * @cdb: SCSI command to translate 1424 * 1425 * Calculate LBA and transfer length for 6-byte commands. 1426 * 1427 * RETURNS: 1428 * @plba: the LBA 1429 * @plen: the transfer length 1430 */ 1431 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1432 { 1433 u64 lba = 0; 1434 u32 len; 1435 1436 VPRINTK("six-byte command\n"); 1437 1438 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1439 lba |= ((u64)cdb[2]) << 8; 1440 lba |= ((u64)cdb[3]); 1441 1442 len = cdb[4]; 1443 1444 *plba = lba; 1445 *plen = len; 1446 } 1447 1448 /** 1449 * scsi_10_lba_len - Get LBA and transfer length 1450 * @cdb: SCSI command to translate 1451 * 1452 * Calculate LBA and transfer length for 10-byte commands. 1453 * 1454 * RETURNS: 1455 * @plba: the LBA 1456 * @plen: the transfer length 1457 */ 1458 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1459 { 1460 u64 lba = 0; 1461 u32 len = 0; 1462 1463 VPRINTK("ten-byte command\n"); 1464 1465 lba |= ((u64)cdb[2]) << 24; 1466 lba |= ((u64)cdb[3]) << 16; 1467 lba |= ((u64)cdb[4]) << 8; 1468 lba |= ((u64)cdb[5]); 1469 1470 len |= ((u32)cdb[7]) << 8; 1471 len |= ((u32)cdb[8]); 1472 1473 *plba = lba; 1474 *plen = len; 1475 } 1476 1477 /** 1478 * scsi_16_lba_len - Get LBA and transfer length 1479 * @cdb: SCSI command to translate 1480 * 1481 * Calculate LBA and transfer length for 16-byte commands. 1482 * 1483 * RETURNS: 1484 * @plba: the LBA 1485 * @plen: the transfer length 1486 */ 1487 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1488 { 1489 u64 lba = 0; 1490 u32 len = 0; 1491 1492 VPRINTK("sixteen-byte command\n"); 1493 1494 lba |= ((u64)cdb[2]) << 56; 1495 lba |= ((u64)cdb[3]) << 48; 1496 lba |= ((u64)cdb[4]) << 40; 1497 lba |= ((u64)cdb[5]) << 32; 1498 lba |= ((u64)cdb[6]) << 24; 1499 lba |= ((u64)cdb[7]) << 16; 1500 lba |= ((u64)cdb[8]) << 8; 1501 lba |= ((u64)cdb[9]); 1502 1503 len |= ((u32)cdb[10]) << 24; 1504 len |= ((u32)cdb[11]) << 16; 1505 len |= ((u32)cdb[12]) << 8; 1506 len |= ((u32)cdb[13]); 1507 1508 *plba = lba; 1509 *plen = len; 1510 } 1511 1512 /** 1513 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1514 * @qc: Storage for translated ATA taskfile 1515 * 1516 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1517 * 1518 * LOCKING: 1519 * spin_lock_irqsave(host lock) 1520 * 1521 * RETURNS: 1522 * Zero on success, non-zero on error. 1523 */ 1524 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1525 { 1526 struct scsi_cmnd *scmd = qc->scsicmd; 1527 struct ata_taskfile *tf = &qc->tf; 1528 struct ata_device *dev = qc->dev; 1529 u64 dev_sectors = qc->dev->n_sectors; 1530 const u8 *cdb = scmd->cmnd; 1531 u64 block; 1532 u32 n_block; 1533 1534 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1535 tf->protocol = ATA_PROT_NODATA; 1536 1537 if (cdb[0] == VERIFY) { 1538 if (scmd->cmd_len < 10) 1539 goto invalid_fld; 1540 scsi_10_lba_len(cdb, &block, &n_block); 1541 } else if (cdb[0] == VERIFY_16) { 1542 if (scmd->cmd_len < 16) 1543 goto invalid_fld; 1544 scsi_16_lba_len(cdb, &block, &n_block); 1545 } else 1546 goto invalid_fld; 1547 1548 if (!n_block) 1549 goto nothing_to_do; 1550 if (block >= dev_sectors) 1551 goto out_of_range; 1552 if ((block + n_block) > dev_sectors) 1553 goto out_of_range; 1554 1555 if (dev->flags & ATA_DFLAG_LBA) { 1556 tf->flags |= ATA_TFLAG_LBA; 1557 1558 if (lba_28_ok(block, n_block)) { 1559 /* use LBA28 */ 1560 tf->command = ATA_CMD_VERIFY; 1561 tf->device |= (block >> 24) & 0xf; 1562 } else if (lba_48_ok(block, n_block)) { 1563 if (!(dev->flags & ATA_DFLAG_LBA48)) 1564 goto out_of_range; 1565 1566 /* use LBA48 */ 1567 tf->flags |= ATA_TFLAG_LBA48; 1568 tf->command = ATA_CMD_VERIFY_EXT; 1569 1570 tf->hob_nsect = (n_block >> 8) & 0xff; 1571 1572 tf->hob_lbah = (block >> 40) & 0xff; 1573 tf->hob_lbam = (block >> 32) & 0xff; 1574 tf->hob_lbal = (block >> 24) & 0xff; 1575 } else 1576 /* request too large even for LBA48 */ 1577 goto out_of_range; 1578 1579 tf->nsect = n_block & 0xff; 1580 1581 tf->lbah = (block >> 16) & 0xff; 1582 tf->lbam = (block >> 8) & 0xff; 1583 tf->lbal = block & 0xff; 1584 1585 tf->device |= ATA_LBA; 1586 } else { 1587 /* CHS */ 1588 u32 sect, head, cyl, track; 1589 1590 if (!lba_28_ok(block, n_block)) 1591 goto out_of_range; 1592 1593 /* Convert LBA to CHS */ 1594 track = (u32)block / dev->sectors; 1595 cyl = track / dev->heads; 1596 head = track % dev->heads; 1597 sect = (u32)block % dev->sectors + 1; 1598 1599 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1600 (u32)block, track, cyl, head, sect); 1601 1602 /* Check whether the converted CHS can fit. 1603 Cylinder: 0-65535 1604 Head: 0-15 1605 Sector: 1-255*/ 1606 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1607 goto out_of_range; 1608 1609 tf->command = ATA_CMD_VERIFY; 1610 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1611 tf->lbal = sect; 1612 tf->lbam = cyl; 1613 tf->lbah = cyl >> 8; 1614 tf->device |= head; 1615 } 1616 1617 return 0; 1618 1619 invalid_fld: 1620 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1621 /* "Invalid field in cbd" */ 1622 return 1; 1623 1624 out_of_range: 1625 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1626 /* "Logical Block Address out of range" */ 1627 return 1; 1628 1629 nothing_to_do: 1630 scmd->result = SAM_STAT_GOOD; 1631 return 1; 1632 } 1633 1634 /** 1635 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1636 * @qc: Storage for translated ATA taskfile 1637 * 1638 * Converts any of six SCSI read/write commands into the 1639 * ATA counterpart, including starting sector (LBA), 1640 * sector count, and taking into account the device's LBA48 1641 * support. 1642 * 1643 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1644 * %WRITE_16 are currently supported. 1645 * 1646 * LOCKING: 1647 * spin_lock_irqsave(host lock) 1648 * 1649 * RETURNS: 1650 * Zero on success, non-zero on error. 1651 */ 1652 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1653 { 1654 struct scsi_cmnd *scmd = qc->scsicmd; 1655 const u8 *cdb = scmd->cmnd; 1656 unsigned int tf_flags = 0; 1657 u64 block; 1658 u32 n_block; 1659 int rc; 1660 1661 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1662 tf_flags |= ATA_TFLAG_WRITE; 1663 1664 /* Calculate the SCSI LBA, transfer length and FUA. */ 1665 switch (cdb[0]) { 1666 case READ_10: 1667 case WRITE_10: 1668 if (unlikely(scmd->cmd_len < 10)) 1669 goto invalid_fld; 1670 scsi_10_lba_len(cdb, &block, &n_block); 1671 if (unlikely(cdb[1] & (1 << 3))) 1672 tf_flags |= ATA_TFLAG_FUA; 1673 break; 1674 case READ_6: 1675 case WRITE_6: 1676 if (unlikely(scmd->cmd_len < 6)) 1677 goto invalid_fld; 1678 scsi_6_lba_len(cdb, &block, &n_block); 1679 1680 /* for 6-byte r/w commands, transfer length 0 1681 * means 256 blocks of data, not 0 block. 1682 */ 1683 if (!n_block) 1684 n_block = 256; 1685 break; 1686 case READ_16: 1687 case WRITE_16: 1688 if (unlikely(scmd->cmd_len < 16)) 1689 goto invalid_fld; 1690 scsi_16_lba_len(cdb, &block, &n_block); 1691 if (unlikely(cdb[1] & (1 << 3))) 1692 tf_flags |= ATA_TFLAG_FUA; 1693 break; 1694 default: 1695 DPRINTK("no-byte command\n"); 1696 goto invalid_fld; 1697 } 1698 1699 /* Check and compose ATA command */ 1700 if (!n_block) 1701 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1702 * length 0 means transfer 0 block of data. 1703 * However, for ATA R/W commands, sector count 0 means 1704 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1705 * 1706 * WARNING: one or two older ATA drives treat 0 as 0... 1707 */ 1708 goto nothing_to_do; 1709 1710 qc->flags |= ATA_QCFLAG_IO; 1711 qc->nbytes = n_block * ATA_SECT_SIZE; 1712 1713 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1714 qc->tag); 1715 if (likely(rc == 0)) 1716 return 0; 1717 1718 if (rc == -ERANGE) 1719 goto out_of_range; 1720 /* treat all other errors as -EINVAL, fall through */ 1721 invalid_fld: 1722 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1723 /* "Invalid field in cbd" */ 1724 return 1; 1725 1726 out_of_range: 1727 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1728 /* "Logical Block Address out of range" */ 1729 return 1; 1730 1731 nothing_to_do: 1732 scmd->result = SAM_STAT_GOOD; 1733 return 1; 1734 } 1735 1736 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1737 { 1738 struct ata_port *ap = qc->ap; 1739 struct scsi_cmnd *cmd = qc->scsicmd; 1740 u8 *cdb = cmd->cmnd; 1741 int need_sense = (qc->err_mask != 0); 1742 1743 /* For ATA pass thru (SAT) commands, generate a sense block if 1744 * user mandated it or if there's an error. Note that if we 1745 * generate because the user forced us to, a check condition 1746 * is generated and the ATA register values are returned 1747 * whether the command completed successfully or not. If there 1748 * was no error, SK, ASC and ASCQ will all be zero. 1749 */ 1750 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1751 ((cdb[2] & 0x20) || need_sense)) { 1752 ata_gen_passthru_sense(qc); 1753 } else { 1754 if (!need_sense) { 1755 cmd->result = SAM_STAT_GOOD; 1756 } else { 1757 /* TODO: decide which descriptor format to use 1758 * for 48b LBA devices and call that here 1759 * instead of the fixed desc, which is only 1760 * good for smaller LBA (and maybe CHS?) 1761 * devices. 1762 */ 1763 ata_gen_ata_sense(qc); 1764 } 1765 } 1766 1767 /* XXX: track spindown state for spindown skipping and warning */ 1768 if (unlikely(qc->tf.command == ATA_CMD_STANDBY || 1769 qc->tf.command == ATA_CMD_STANDBYNOW1)) 1770 qc->dev->flags |= ATA_DFLAG_SPUNDOWN; 1771 else if (likely(system_state != SYSTEM_HALT && 1772 system_state != SYSTEM_POWER_OFF)) 1773 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN; 1774 1775 if (need_sense && !ap->ops->error_handler) 1776 ata_dump_status(ap->print_id, &qc->result_tf); 1777 1778 qc->scsidone(cmd); 1779 1780 ata_qc_free(qc); 1781 } 1782 1783 /** 1784 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1785 * @dev: ATA device to which the command is addressed 1786 * @cmd: SCSI command to execute 1787 * @done: SCSI command completion function 1788 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1789 * 1790 * Our ->queuecommand() function has decided that the SCSI 1791 * command issued can be directly translated into an ATA 1792 * command, rather than handled internally. 1793 * 1794 * This function sets up an ata_queued_cmd structure for the 1795 * SCSI command, and sends that ata_queued_cmd to the hardware. 1796 * 1797 * The xlat_func argument (actor) returns 0 if ready to execute 1798 * ATA command, else 1 to finish translation. If 1 is returned 1799 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1800 * to be set reflecting an error condition or clean (early) 1801 * termination. 1802 * 1803 * LOCKING: 1804 * spin_lock_irqsave(host lock) 1805 * 1806 * RETURNS: 1807 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1808 * needs to be deferred. 1809 */ 1810 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1811 void (*done)(struct scsi_cmnd *), 1812 ata_xlat_func_t xlat_func) 1813 { 1814 struct ata_port *ap = dev->link->ap; 1815 struct ata_queued_cmd *qc; 1816 int rc; 1817 1818 VPRINTK("ENTER\n"); 1819 1820 qc = ata_scsi_qc_new(dev, cmd, done); 1821 if (!qc) 1822 goto err_mem; 1823 1824 /* data is present; dma-map it */ 1825 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1826 cmd->sc_data_direction == DMA_TO_DEVICE) { 1827 if (unlikely(scsi_bufflen(cmd) < 1)) { 1828 ata_dev_printk(dev, KERN_WARNING, 1829 "WARNING: zero len r/w req\n"); 1830 goto err_did; 1831 } 1832 1833 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1834 1835 qc->dma_dir = cmd->sc_data_direction; 1836 } 1837 1838 qc->complete_fn = ata_scsi_qc_complete; 1839 1840 if (xlat_func(qc)) 1841 goto early_finish; 1842 1843 if (ap->ops->qc_defer) { 1844 if ((rc = ap->ops->qc_defer(qc))) 1845 goto defer; 1846 } 1847 1848 /* select device, send command to hardware */ 1849 ata_qc_issue(qc); 1850 1851 VPRINTK("EXIT\n"); 1852 return 0; 1853 1854 early_finish: 1855 ata_qc_free(qc); 1856 qc->scsidone(cmd); 1857 DPRINTK("EXIT - early finish (good or error)\n"); 1858 return 0; 1859 1860 err_did: 1861 ata_qc_free(qc); 1862 cmd->result = (DID_ERROR << 16); 1863 qc->scsidone(cmd); 1864 err_mem: 1865 DPRINTK("EXIT - internal\n"); 1866 return 0; 1867 1868 defer: 1869 ata_qc_free(qc); 1870 DPRINTK("EXIT - defer\n"); 1871 if (rc == ATA_DEFER_LINK) 1872 return SCSI_MLQUEUE_DEVICE_BUSY; 1873 else 1874 return SCSI_MLQUEUE_HOST_BUSY; 1875 } 1876 1877 /** 1878 * ata_scsi_rbuf_get - Map response buffer. 1879 * @cmd: SCSI command containing buffer to be mapped. 1880 * @flags: unsigned long variable to store irq enable status 1881 * @copy_in: copy in from user buffer 1882 * 1883 * Prepare buffer for simulated SCSI commands. 1884 * 1885 * LOCKING: 1886 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1887 * 1888 * RETURNS: 1889 * Pointer to response buffer. 1890 */ 1891 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1892 unsigned long *flags) 1893 { 1894 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1895 1896 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1897 if (copy_in) 1898 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1899 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1900 return ata_scsi_rbuf; 1901 } 1902 1903 /** 1904 * ata_scsi_rbuf_put - Unmap response buffer. 1905 * @cmd: SCSI command containing buffer to be unmapped. 1906 * @copy_out: copy out result 1907 * @flags: @flags passed to ata_scsi_rbuf_get() 1908 * 1909 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1910 * @copy_back is true. 1911 * 1912 * LOCKING: 1913 * Unlocks ata_scsi_rbuf_lock. 1914 */ 1915 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1916 unsigned long *flags) 1917 { 1918 if (copy_out) 1919 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1920 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1921 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1922 } 1923 1924 /** 1925 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1926 * @args: device IDENTIFY data / SCSI command of interest. 1927 * @actor: Callback hook for desired SCSI command simulator 1928 * 1929 * Takes care of the hard work of simulating a SCSI command... 1930 * Mapping the response buffer, calling the command's handler, 1931 * and handling the handler's return value. This return value 1932 * indicates whether the handler wishes the SCSI command to be 1933 * completed successfully (0), or not (in which case cmd->result 1934 * and sense buffer are assumed to be set). 1935 * 1936 * LOCKING: 1937 * spin_lock_irqsave(host lock) 1938 */ 1939 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1940 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1941 { 1942 u8 *rbuf; 1943 unsigned int rc; 1944 struct scsi_cmnd *cmd = args->cmd; 1945 unsigned long flags; 1946 1947 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1948 rc = actor(args, rbuf); 1949 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1950 1951 if (rc == 0) 1952 cmd->result = SAM_STAT_GOOD; 1953 args->done(cmd); 1954 } 1955 1956 /** 1957 * ata_scsiop_inq_std - Simulate INQUIRY command 1958 * @args: device IDENTIFY data / SCSI command of interest. 1959 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1960 * 1961 * Returns standard device identification data associated 1962 * with non-VPD INQUIRY command output. 1963 * 1964 * LOCKING: 1965 * spin_lock_irqsave(host lock) 1966 */ 1967 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1968 { 1969 const u8 versions[] = { 1970 0x60, /* SAM-3 (no version claimed) */ 1971 1972 0x03, 1973 0x20, /* SBC-2 (no version claimed) */ 1974 1975 0x02, 1976 0x60 /* SPC-3 (no version claimed) */ 1977 }; 1978 u8 hdr[] = { 1979 TYPE_DISK, 1980 0, 1981 0x5, /* claim SPC-3 version compatibility */ 1982 2, 1983 95 - 4 1984 }; 1985 1986 VPRINTK("ENTER\n"); 1987 1988 /* set scsi removeable (RMB) bit per ata bit */ 1989 if (ata_id_removeable(args->id)) 1990 hdr[1] |= (1 << 7); 1991 1992 memcpy(rbuf, hdr, sizeof(hdr)); 1993 memcpy(&rbuf[8], "ATA ", 8); 1994 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1995 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1996 1997 if (rbuf[32] == 0 || rbuf[32] == ' ') 1998 memcpy(&rbuf[32], "n/a ", 4); 1999 2000 memcpy(rbuf + 59, versions, sizeof(versions)); 2001 2002 return 0; 2003 } 2004 2005 /** 2006 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2007 * @args: device IDENTIFY data / SCSI command of interest. 2008 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2009 * 2010 * Returns list of inquiry VPD pages available. 2011 * 2012 * LOCKING: 2013 * spin_lock_irqsave(host lock) 2014 */ 2015 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2016 { 2017 const u8 pages[] = { 2018 0x00, /* page 0x00, this page */ 2019 0x80, /* page 0x80, unit serial no page */ 2020 0x83, /* page 0x83, device ident page */ 2021 0x89, /* page 0x89, ata info page */ 2022 0xb1, /* page 0xb1, block device characteristics page */ 2023 }; 2024 2025 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2026 memcpy(rbuf + 4, pages, sizeof(pages)); 2027 return 0; 2028 } 2029 2030 /** 2031 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2032 * @args: device IDENTIFY data / SCSI command of interest. 2033 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2034 * 2035 * Returns ATA device serial number. 2036 * 2037 * LOCKING: 2038 * spin_lock_irqsave(host lock) 2039 */ 2040 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2041 { 2042 const u8 hdr[] = { 2043 0, 2044 0x80, /* this page code */ 2045 0, 2046 ATA_ID_SERNO_LEN, /* page len */ 2047 }; 2048 2049 memcpy(rbuf, hdr, sizeof(hdr)); 2050 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2051 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2052 return 0; 2053 } 2054 2055 /** 2056 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2057 * @args: device IDENTIFY data / SCSI command of interest. 2058 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2059 * 2060 * Yields two logical unit device identification designators: 2061 * - vendor specific ASCII containing the ATA serial number 2062 * - SAT defined "t10 vendor id based" containing ASCII vendor 2063 * name ("ATA "), model and serial numbers. 2064 * 2065 * LOCKING: 2066 * spin_lock_irqsave(host lock) 2067 */ 2068 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2069 { 2070 const int sat_model_serial_desc_len = 68; 2071 int num; 2072 2073 rbuf[1] = 0x83; /* this page code */ 2074 num = 4; 2075 2076 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2077 rbuf[num + 0] = 2; 2078 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2079 num += 4; 2080 ata_id_string(args->id, (unsigned char *) rbuf + num, 2081 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2082 num += ATA_ID_SERNO_LEN; 2083 2084 /* SAT defined lu model and serial numbers descriptor */ 2085 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2086 rbuf[num + 0] = 2; 2087 rbuf[num + 1] = 1; 2088 rbuf[num + 3] = sat_model_serial_desc_len; 2089 num += 4; 2090 memcpy(rbuf + num, "ATA ", 8); 2091 num += 8; 2092 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2093 ATA_ID_PROD_LEN); 2094 num += ATA_ID_PROD_LEN; 2095 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2096 ATA_ID_SERNO_LEN); 2097 num += ATA_ID_SERNO_LEN; 2098 2099 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2100 return 0; 2101 } 2102 2103 /** 2104 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2105 * @args: device IDENTIFY data / SCSI command of interest. 2106 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2107 * 2108 * Yields SAT-specified ATA VPD page. 2109 * 2110 * LOCKING: 2111 * spin_lock_irqsave(host lock) 2112 */ 2113 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2114 { 2115 struct ata_taskfile tf; 2116 2117 memset(&tf, 0, sizeof(tf)); 2118 2119 rbuf[1] = 0x89; /* our page code */ 2120 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2121 rbuf[3] = (0x238 & 0xff); 2122 2123 memcpy(&rbuf[8], "linux ", 8); 2124 memcpy(&rbuf[16], "libata ", 16); 2125 memcpy(&rbuf[32], DRV_VERSION, 4); 2126 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2127 2128 /* we don't store the ATA device signature, so we fake it */ 2129 2130 tf.command = ATA_DRDY; /* really, this is Status reg */ 2131 tf.lbal = 0x1; 2132 tf.nsect = 0x1; 2133 2134 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2135 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2136 2137 rbuf[56] = ATA_CMD_ID_ATA; 2138 2139 memcpy(&rbuf[60], &args->id[0], 512); 2140 return 0; 2141 } 2142 2143 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2144 { 2145 rbuf[1] = 0xb1; 2146 rbuf[3] = 0x3c; 2147 if (ata_id_major_version(args->id) > 7) { 2148 rbuf[4] = args->id[217] >> 8; 2149 rbuf[5] = args->id[217]; 2150 rbuf[7] = args->id[168] & 0xf; 2151 } 2152 2153 return 0; 2154 } 2155 2156 /** 2157 * ata_scsiop_noop - Command handler that simply returns success. 2158 * @args: device IDENTIFY data / SCSI command of interest. 2159 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2160 * 2161 * No operation. Simply returns success to caller, to indicate 2162 * that the caller should successfully complete this SCSI command. 2163 * 2164 * LOCKING: 2165 * spin_lock_irqsave(host lock) 2166 */ 2167 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2168 { 2169 VPRINTK("ENTER\n"); 2170 return 0; 2171 } 2172 2173 /** 2174 * ata_msense_caching - Simulate MODE SENSE caching info page 2175 * @id: device IDENTIFY data 2176 * @buf: output buffer 2177 * 2178 * Generate a caching info page, which conditionally indicates 2179 * write caching to the SCSI layer, depending on device 2180 * capabilities. 2181 * 2182 * LOCKING: 2183 * None. 2184 */ 2185 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2186 { 2187 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2188 if (ata_id_wcache_enabled(id)) 2189 buf[2] |= (1 << 2); /* write cache enable */ 2190 if (!ata_id_rahead_enabled(id)) 2191 buf[12] |= (1 << 5); /* disable read ahead */ 2192 return sizeof(def_cache_mpage); 2193 } 2194 2195 /** 2196 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2197 * @buf: output buffer 2198 * 2199 * Generate a generic MODE SENSE control mode page. 2200 * 2201 * LOCKING: 2202 * None. 2203 */ 2204 static unsigned int ata_msense_ctl_mode(u8 *buf) 2205 { 2206 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2207 return sizeof(def_control_mpage); 2208 } 2209 2210 /** 2211 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2212 * @buf: output buffer 2213 * 2214 * Generate a generic MODE SENSE r/w error recovery page. 2215 * 2216 * LOCKING: 2217 * None. 2218 */ 2219 static unsigned int ata_msense_rw_recovery(u8 *buf) 2220 { 2221 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2222 return sizeof(def_rw_recovery_mpage); 2223 } 2224 2225 /* 2226 * We can turn this into a real blacklist if it's needed, for now just 2227 * blacklist any Maxtor BANC1G10 revision firmware 2228 */ 2229 static int ata_dev_supports_fua(u16 *id) 2230 { 2231 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2232 2233 if (!libata_fua) 2234 return 0; 2235 if (!ata_id_has_fua(id)) 2236 return 0; 2237 2238 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2239 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2240 2241 if (strcmp(model, "Maxtor")) 2242 return 1; 2243 if (strcmp(fw, "BANC1G10")) 2244 return 1; 2245 2246 return 0; /* blacklisted */ 2247 } 2248 2249 /** 2250 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2251 * @args: device IDENTIFY data / SCSI command of interest. 2252 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2253 * 2254 * Simulate MODE SENSE commands. Assume this is invoked for direct 2255 * access devices (e.g. disks) only. There should be no block 2256 * descriptor for other device types. 2257 * 2258 * LOCKING: 2259 * spin_lock_irqsave(host lock) 2260 */ 2261 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2262 { 2263 struct ata_device *dev = args->dev; 2264 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2265 const u8 sat_blk_desc[] = { 2266 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2267 0, 2268 0, 0x2, 0x0 /* block length: 512 bytes */ 2269 }; 2270 u8 pg, spg; 2271 unsigned int ebd, page_control, six_byte; 2272 u8 dpofua; 2273 2274 VPRINTK("ENTER\n"); 2275 2276 six_byte = (scsicmd[0] == MODE_SENSE); 2277 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2278 /* 2279 * LLBA bit in msense(10) ignored (compliant) 2280 */ 2281 2282 page_control = scsicmd[2] >> 6; 2283 switch (page_control) { 2284 case 0: /* current */ 2285 break; /* supported */ 2286 case 3: /* saved */ 2287 goto saving_not_supp; 2288 case 1: /* changeable */ 2289 case 2: /* defaults */ 2290 default: 2291 goto invalid_fld; 2292 } 2293 2294 if (six_byte) 2295 p += 4 + (ebd ? 8 : 0); 2296 else 2297 p += 8 + (ebd ? 8 : 0); 2298 2299 pg = scsicmd[2] & 0x3f; 2300 spg = scsicmd[3]; 2301 /* 2302 * No mode subpages supported (yet) but asking for _all_ 2303 * subpages may be valid 2304 */ 2305 if (spg && (spg != ALL_SUB_MPAGES)) 2306 goto invalid_fld; 2307 2308 switch(pg) { 2309 case RW_RECOVERY_MPAGE: 2310 p += ata_msense_rw_recovery(p); 2311 break; 2312 2313 case CACHE_MPAGE: 2314 p += ata_msense_caching(args->id, p); 2315 break; 2316 2317 case CONTROL_MPAGE: 2318 p += ata_msense_ctl_mode(p); 2319 break; 2320 2321 case ALL_MPAGES: 2322 p += ata_msense_rw_recovery(p); 2323 p += ata_msense_caching(args->id, p); 2324 p += ata_msense_ctl_mode(p); 2325 break; 2326 2327 default: /* invalid page code */ 2328 goto invalid_fld; 2329 } 2330 2331 dpofua = 0; 2332 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2333 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2334 dpofua = 1 << 4; 2335 2336 if (six_byte) { 2337 rbuf[0] = p - rbuf - 1; 2338 rbuf[2] |= dpofua; 2339 if (ebd) { 2340 rbuf[3] = sizeof(sat_blk_desc); 2341 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2342 } 2343 } else { 2344 unsigned int output_len = p - rbuf - 2; 2345 2346 rbuf[0] = output_len >> 8; 2347 rbuf[1] = output_len; 2348 rbuf[3] |= dpofua; 2349 if (ebd) { 2350 rbuf[7] = sizeof(sat_blk_desc); 2351 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2352 } 2353 } 2354 return 0; 2355 2356 invalid_fld: 2357 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2358 /* "Invalid field in cbd" */ 2359 return 1; 2360 2361 saving_not_supp: 2362 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2363 /* "Saving parameters not supported" */ 2364 return 1; 2365 } 2366 2367 /** 2368 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2369 * @args: device IDENTIFY data / SCSI command of interest. 2370 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2371 * 2372 * Simulate READ CAPACITY commands. 2373 * 2374 * LOCKING: 2375 * None. 2376 */ 2377 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2378 { 2379 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */ 2380 2381 VPRINTK("ENTER\n"); 2382 2383 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2384 if (last_lba >= 0xffffffffULL) 2385 last_lba = 0xffffffff; 2386 2387 /* sector count, 32-bit */ 2388 rbuf[0] = last_lba >> (8 * 3); 2389 rbuf[1] = last_lba >> (8 * 2); 2390 rbuf[2] = last_lba >> (8 * 1); 2391 rbuf[3] = last_lba; 2392 2393 /* sector size */ 2394 rbuf[6] = ATA_SECT_SIZE >> 8; 2395 rbuf[7] = ATA_SECT_SIZE & 0xff; 2396 } else { 2397 /* sector count, 64-bit */ 2398 rbuf[0] = last_lba >> (8 * 7); 2399 rbuf[1] = last_lba >> (8 * 6); 2400 rbuf[2] = last_lba >> (8 * 5); 2401 rbuf[3] = last_lba >> (8 * 4); 2402 rbuf[4] = last_lba >> (8 * 3); 2403 rbuf[5] = last_lba >> (8 * 2); 2404 rbuf[6] = last_lba >> (8 * 1); 2405 rbuf[7] = last_lba; 2406 2407 /* sector size */ 2408 rbuf[10] = ATA_SECT_SIZE >> 8; 2409 rbuf[11] = ATA_SECT_SIZE & 0xff; 2410 } 2411 2412 return 0; 2413 } 2414 2415 /** 2416 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2417 * @args: device IDENTIFY data / SCSI command of interest. 2418 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2419 * 2420 * Simulate REPORT LUNS command. 2421 * 2422 * LOCKING: 2423 * spin_lock_irqsave(host lock) 2424 */ 2425 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2426 { 2427 VPRINTK("ENTER\n"); 2428 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2429 2430 return 0; 2431 } 2432 2433 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2434 { 2435 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2436 /* FIXME: not quite right; we don't want the 2437 * translation of taskfile registers into 2438 * a sense descriptors, since that's only 2439 * correct for ATA, not ATAPI 2440 */ 2441 ata_gen_passthru_sense(qc); 2442 } 2443 2444 qc->scsidone(qc->scsicmd); 2445 ata_qc_free(qc); 2446 } 2447 2448 /* is it pointless to prefer PIO for "safety reasons"? */ 2449 static inline int ata_pio_use_silly(struct ata_port *ap) 2450 { 2451 return (ap->flags & ATA_FLAG_PIO_DMA); 2452 } 2453 2454 static void atapi_request_sense(struct ata_queued_cmd *qc) 2455 { 2456 struct ata_port *ap = qc->ap; 2457 struct scsi_cmnd *cmd = qc->scsicmd; 2458 2459 DPRINTK("ATAPI request sense\n"); 2460 2461 /* FIXME: is this needed? */ 2462 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2463 2464 #ifdef CONFIG_ATA_SFF 2465 if (ap->ops->sff_tf_read) 2466 ap->ops->sff_tf_read(ap, &qc->tf); 2467 #endif 2468 2469 /* fill these in, for the case where they are -not- overwritten */ 2470 cmd->sense_buffer[0] = 0x70; 2471 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2472 2473 ata_qc_reinit(qc); 2474 2475 /* setup sg table and init transfer direction */ 2476 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2477 ata_sg_init(qc, &qc->sgent, 1); 2478 qc->dma_dir = DMA_FROM_DEVICE; 2479 2480 memset(&qc->cdb, 0, qc->dev->cdb_len); 2481 qc->cdb[0] = REQUEST_SENSE; 2482 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2483 2484 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2485 qc->tf.command = ATA_CMD_PACKET; 2486 2487 if (ata_pio_use_silly(ap)) { 2488 qc->tf.protocol = ATAPI_PROT_DMA; 2489 qc->tf.feature |= ATAPI_PKT_DMA; 2490 } else { 2491 qc->tf.protocol = ATAPI_PROT_PIO; 2492 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2493 qc->tf.lbah = 0; 2494 } 2495 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2496 2497 qc->complete_fn = atapi_sense_complete; 2498 2499 ata_qc_issue(qc); 2500 2501 DPRINTK("EXIT\n"); 2502 } 2503 2504 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2505 { 2506 struct scsi_cmnd *cmd = qc->scsicmd; 2507 unsigned int err_mask = qc->err_mask; 2508 2509 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2510 2511 /* handle completion from new EH */ 2512 if (unlikely(qc->ap->ops->error_handler && 2513 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2514 2515 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2516 /* FIXME: not quite right; we don't want the 2517 * translation of taskfile registers into a 2518 * sense descriptors, since that's only 2519 * correct for ATA, not ATAPI 2520 */ 2521 ata_gen_passthru_sense(qc); 2522 } 2523 2524 /* SCSI EH automatically locks door if sdev->locked is 2525 * set. Sometimes door lock request continues to 2526 * fail, for example, when no media is present. This 2527 * creates a loop - SCSI EH issues door lock which 2528 * fails and gets invoked again to acquire sense data 2529 * for the failed command. 2530 * 2531 * If door lock fails, always clear sdev->locked to 2532 * avoid this infinite loop. 2533 */ 2534 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2535 qc->dev->sdev->locked = 0; 2536 2537 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2538 qc->scsidone(cmd); 2539 ata_qc_free(qc); 2540 return; 2541 } 2542 2543 /* successful completion or old EH failure path */ 2544 if (unlikely(err_mask & AC_ERR_DEV)) { 2545 cmd->result = SAM_STAT_CHECK_CONDITION; 2546 atapi_request_sense(qc); 2547 return; 2548 } else if (unlikely(err_mask)) { 2549 /* FIXME: not quite right; we don't want the 2550 * translation of taskfile registers into 2551 * a sense descriptors, since that's only 2552 * correct for ATA, not ATAPI 2553 */ 2554 ata_gen_passthru_sense(qc); 2555 } else { 2556 u8 *scsicmd = cmd->cmnd; 2557 2558 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2559 unsigned long flags; 2560 u8 *buf; 2561 2562 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2563 2564 /* ATAPI devices typically report zero for their SCSI version, 2565 * and sometimes deviate from the spec WRT response data 2566 * format. If SCSI version is reported as zero like normal, 2567 * then we make the following fixups: 1) Fake MMC-5 version, 2568 * to indicate to the Linux scsi midlayer this is a modern 2569 * device. 2) Ensure response data format / ATAPI information 2570 * are always correct. 2571 */ 2572 if (buf[2] == 0) { 2573 buf[2] = 0x5; 2574 buf[3] = 0x32; 2575 } 2576 2577 ata_scsi_rbuf_put(cmd, true, &flags); 2578 } 2579 2580 cmd->result = SAM_STAT_GOOD; 2581 } 2582 2583 qc->scsidone(cmd); 2584 ata_qc_free(qc); 2585 } 2586 /** 2587 * atapi_xlat - Initialize PACKET taskfile 2588 * @qc: command structure to be initialized 2589 * 2590 * LOCKING: 2591 * spin_lock_irqsave(host lock) 2592 * 2593 * RETURNS: 2594 * Zero on success, non-zero on failure. 2595 */ 2596 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2597 { 2598 struct scsi_cmnd *scmd = qc->scsicmd; 2599 struct ata_device *dev = qc->dev; 2600 int nodata = (scmd->sc_data_direction == DMA_NONE); 2601 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2602 unsigned int nbytes; 2603 2604 memset(qc->cdb, 0, dev->cdb_len); 2605 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2606 2607 qc->complete_fn = atapi_qc_complete; 2608 2609 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2610 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2611 qc->tf.flags |= ATA_TFLAG_WRITE; 2612 DPRINTK("direction: write\n"); 2613 } 2614 2615 qc->tf.command = ATA_CMD_PACKET; 2616 ata_qc_set_pc_nbytes(qc); 2617 2618 /* check whether ATAPI DMA is safe */ 2619 if (!nodata && !using_pio && atapi_check_dma(qc)) 2620 using_pio = 1; 2621 2622 /* Some controller variants snoop this value for Packet 2623 * transfers to do state machine and FIFO management. Thus we 2624 * want to set it properly, and for DMA where it is 2625 * effectively meaningless. 2626 */ 2627 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2628 2629 /* Most ATAPI devices which honor transfer chunk size don't 2630 * behave according to the spec when odd chunk size which 2631 * matches the transfer length is specified. If the number of 2632 * bytes to transfer is 2n+1. According to the spec, what 2633 * should happen is to indicate that 2n+1 is going to be 2634 * transferred and transfer 2n+2 bytes where the last byte is 2635 * padding. 2636 * 2637 * In practice, this doesn't happen. ATAPI devices first 2638 * indicate and transfer 2n bytes and then indicate and 2639 * transfer 2 bytes where the last byte is padding. 2640 * 2641 * This inconsistency confuses several controllers which 2642 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2643 * These controllers use actual number of transferred bytes to 2644 * update DMA poitner and transfer of 4n+2 bytes make those 2645 * controller push DMA pointer by 4n+4 bytes because SATA data 2646 * FISes are aligned to 4 bytes. This causes data corruption 2647 * and buffer overrun. 2648 * 2649 * Always setting nbytes to even number solves this problem 2650 * because then ATAPI devices don't have to split data at 2n 2651 * boundaries. 2652 */ 2653 if (nbytes & 0x1) 2654 nbytes++; 2655 2656 qc->tf.lbam = (nbytes & 0xFF); 2657 qc->tf.lbah = (nbytes >> 8); 2658 2659 if (nodata) 2660 qc->tf.protocol = ATAPI_PROT_NODATA; 2661 else if (using_pio) 2662 qc->tf.protocol = ATAPI_PROT_PIO; 2663 else { 2664 /* DMA data xfer */ 2665 qc->tf.protocol = ATAPI_PROT_DMA; 2666 qc->tf.feature |= ATAPI_PKT_DMA; 2667 2668 if ((dev->flags & ATA_DFLAG_DMADIR) && 2669 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2670 /* some SATA bridges need us to indicate data xfer direction */ 2671 qc->tf.feature |= ATAPI_DMADIR; 2672 } 2673 2674 2675 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2676 as ATAPI tape drives don't get this right otherwise */ 2677 return 0; 2678 } 2679 2680 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2681 { 2682 if (!sata_pmp_attached(ap)) { 2683 if (likely(devno < ata_link_max_devices(&ap->link))) 2684 return &ap->link.device[devno]; 2685 } else { 2686 if (likely(devno < ap->nr_pmp_links)) 2687 return &ap->pmp_link[devno].device[0]; 2688 } 2689 2690 return NULL; 2691 } 2692 2693 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2694 const struct scsi_device *scsidev) 2695 { 2696 int devno; 2697 2698 /* skip commands not addressed to targets we simulate */ 2699 if (!sata_pmp_attached(ap)) { 2700 if (unlikely(scsidev->channel || scsidev->lun)) 2701 return NULL; 2702 devno = scsidev->id; 2703 } else { 2704 if (unlikely(scsidev->id || scsidev->lun)) 2705 return NULL; 2706 devno = scsidev->channel; 2707 } 2708 2709 return ata_find_dev(ap, devno); 2710 } 2711 2712 /** 2713 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2714 * @ap: ATA port to which the device is attached 2715 * @scsidev: SCSI device from which we derive the ATA device 2716 * 2717 * Given various information provided in struct scsi_cmnd, 2718 * map that onto an ATA bus, and using that mapping 2719 * determine which ata_device is associated with the 2720 * SCSI command to be sent. 2721 * 2722 * LOCKING: 2723 * spin_lock_irqsave(host lock) 2724 * 2725 * RETURNS: 2726 * Associated ATA device, or %NULL if not found. 2727 */ 2728 static struct ata_device * 2729 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2730 { 2731 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2732 2733 if (unlikely(!dev || !ata_dev_enabled(dev))) 2734 return NULL; 2735 2736 return dev; 2737 } 2738 2739 /* 2740 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2741 * @byte1: Byte 1 from pass-thru CDB. 2742 * 2743 * RETURNS: 2744 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2745 */ 2746 static u8 2747 ata_scsi_map_proto(u8 byte1) 2748 { 2749 switch((byte1 & 0x1e) >> 1) { 2750 case 3: /* Non-data */ 2751 return ATA_PROT_NODATA; 2752 2753 case 6: /* DMA */ 2754 case 10: /* UDMA Data-in */ 2755 case 11: /* UDMA Data-Out */ 2756 return ATA_PROT_DMA; 2757 2758 case 4: /* PIO Data-in */ 2759 case 5: /* PIO Data-out */ 2760 return ATA_PROT_PIO; 2761 2762 case 0: /* Hard Reset */ 2763 case 1: /* SRST */ 2764 case 8: /* Device Diagnostic */ 2765 case 9: /* Device Reset */ 2766 case 7: /* DMA Queued */ 2767 case 12: /* FPDMA */ 2768 case 15: /* Return Response Info */ 2769 default: /* Reserved */ 2770 break; 2771 } 2772 2773 return ATA_PROT_UNKNOWN; 2774 } 2775 2776 /** 2777 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2778 * @qc: command structure to be initialized 2779 * 2780 * Handles either 12 or 16-byte versions of the CDB. 2781 * 2782 * RETURNS: 2783 * Zero on success, non-zero on failure. 2784 */ 2785 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2786 { 2787 struct ata_taskfile *tf = &(qc->tf); 2788 struct scsi_cmnd *scmd = qc->scsicmd; 2789 struct ata_device *dev = qc->dev; 2790 const u8 *cdb = scmd->cmnd; 2791 2792 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2793 goto invalid_fld; 2794 2795 /* 2796 * Filter TPM commands by default. These provide an 2797 * essentially uncontrolled encrypted "back door" between 2798 * applications and the disk. Set libata.allow_tpm=1 if you 2799 * have a real reason for wanting to use them. This ensures 2800 * that installed software cannot easily mess stuff up without 2801 * user intent. DVR type users will probably ship with this enabled 2802 * for movie content management. 2803 * 2804 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2805 * for this and should do in future but that it is not sufficient as 2806 * DCS is an optional feature set. Thus we also do the software filter 2807 * so that we comply with the TC consortium stated goal that the user 2808 * can turn off TC features of their system. 2809 */ 2810 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2811 goto invalid_fld; 2812 2813 /* We may not issue DMA commands if no DMA mode is set */ 2814 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2815 goto invalid_fld; 2816 2817 /* 2818 * 12 and 16 byte CDBs use different offsets to 2819 * provide the various register values. 2820 */ 2821 if (cdb[0] == ATA_16) { 2822 /* 2823 * 16-byte CDB - may contain extended commands. 2824 * 2825 * If that is the case, copy the upper byte register values. 2826 */ 2827 if (cdb[1] & 0x01) { 2828 tf->hob_feature = cdb[3]; 2829 tf->hob_nsect = cdb[5]; 2830 tf->hob_lbal = cdb[7]; 2831 tf->hob_lbam = cdb[9]; 2832 tf->hob_lbah = cdb[11]; 2833 tf->flags |= ATA_TFLAG_LBA48; 2834 } else 2835 tf->flags &= ~ATA_TFLAG_LBA48; 2836 2837 /* 2838 * Always copy low byte, device and command registers. 2839 */ 2840 tf->feature = cdb[4]; 2841 tf->nsect = cdb[6]; 2842 tf->lbal = cdb[8]; 2843 tf->lbam = cdb[10]; 2844 tf->lbah = cdb[12]; 2845 tf->device = cdb[13]; 2846 tf->command = cdb[14]; 2847 } else { 2848 /* 2849 * 12-byte CDB - incapable of extended commands. 2850 */ 2851 tf->flags &= ~ATA_TFLAG_LBA48; 2852 2853 tf->feature = cdb[3]; 2854 tf->nsect = cdb[4]; 2855 tf->lbal = cdb[5]; 2856 tf->lbam = cdb[6]; 2857 tf->lbah = cdb[7]; 2858 tf->device = cdb[8]; 2859 tf->command = cdb[9]; 2860 } 2861 2862 /* enforce correct master/slave bit */ 2863 tf->device = dev->devno ? 2864 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2865 2866 /* sanity check for pio multi commands */ 2867 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2868 goto invalid_fld; 2869 2870 if (is_multi_taskfile(tf)) { 2871 unsigned int multi_count = 1 << (cdb[1] >> 5); 2872 2873 /* compare the passed through multi_count 2874 * with the cached multi_count of libata 2875 */ 2876 if (multi_count != dev->multi_count) 2877 ata_dev_printk(dev, KERN_WARNING, 2878 "invalid multi_count %u ignored\n", 2879 multi_count); 2880 } 2881 2882 /* READ/WRITE LONG use a non-standard sect_size */ 2883 qc->sect_size = ATA_SECT_SIZE; 2884 switch (tf->command) { 2885 case ATA_CMD_READ_LONG: 2886 case ATA_CMD_READ_LONG_ONCE: 2887 case ATA_CMD_WRITE_LONG: 2888 case ATA_CMD_WRITE_LONG_ONCE: 2889 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2890 goto invalid_fld; 2891 qc->sect_size = scsi_bufflen(scmd); 2892 } 2893 2894 /* 2895 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2896 * SET_FEATURES - XFER MODE must be preceded/succeeded 2897 * by an update to hardware-specific registers for each 2898 * controller (i.e. the reason for ->set_piomode(), 2899 * ->set_dmamode(), and ->post_set_mode() hooks). 2900 */ 2901 if ((tf->command == ATA_CMD_SET_FEATURES) 2902 && (tf->feature == SETFEATURES_XFER)) 2903 goto invalid_fld; 2904 2905 /* 2906 * Set flags so that all registers will be written, 2907 * and pass on write indication (used for PIO/DMA 2908 * setup.) 2909 */ 2910 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2911 2912 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2913 tf->flags |= ATA_TFLAG_WRITE; 2914 2915 /* 2916 * Set transfer length. 2917 * 2918 * TODO: find out if we need to do more here to 2919 * cover scatter/gather case. 2920 */ 2921 ata_qc_set_pc_nbytes(qc); 2922 2923 /* request result TF and be quiet about device error */ 2924 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2925 2926 return 0; 2927 2928 invalid_fld: 2929 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2930 /* "Invalid field in cdb" */ 2931 return 1; 2932 } 2933 2934 /** 2935 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2936 * @dev: ATA device 2937 * @cmd: SCSI command opcode to consider 2938 * 2939 * Look up the SCSI command given, and determine whether the 2940 * SCSI command is to be translated or simulated. 2941 * 2942 * RETURNS: 2943 * Pointer to translation function if possible, %NULL if not. 2944 */ 2945 2946 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2947 { 2948 switch (cmd) { 2949 case READ_6: 2950 case READ_10: 2951 case READ_16: 2952 2953 case WRITE_6: 2954 case WRITE_10: 2955 case WRITE_16: 2956 return ata_scsi_rw_xlat; 2957 2958 case SYNCHRONIZE_CACHE: 2959 if (ata_try_flush_cache(dev)) 2960 return ata_scsi_flush_xlat; 2961 break; 2962 2963 case VERIFY: 2964 case VERIFY_16: 2965 return ata_scsi_verify_xlat; 2966 2967 case ATA_12: 2968 case ATA_16: 2969 return ata_scsi_pass_thru; 2970 2971 case START_STOP: 2972 return ata_scsi_start_stop_xlat; 2973 } 2974 2975 return NULL; 2976 } 2977 2978 /** 2979 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2980 * @ap: ATA port to which the command was being sent 2981 * @cmd: SCSI command to dump 2982 * 2983 * Prints the contents of a SCSI command via printk(). 2984 */ 2985 2986 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2987 struct scsi_cmnd *cmd) 2988 { 2989 #ifdef ATA_DEBUG 2990 struct scsi_device *scsidev = cmd->device; 2991 u8 *scsicmd = cmd->cmnd; 2992 2993 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2994 ap->print_id, 2995 scsidev->channel, scsidev->id, scsidev->lun, 2996 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2997 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2998 scsicmd[8]); 2999 #endif 3000 } 3001 3002 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3003 void (*done)(struct scsi_cmnd *), 3004 struct ata_device *dev) 3005 { 3006 u8 scsi_op = scmd->cmnd[0]; 3007 ata_xlat_func_t xlat_func; 3008 int rc = 0; 3009 3010 if (dev->class == ATA_DEV_ATA) { 3011 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3012 goto bad_cdb_len; 3013 3014 xlat_func = ata_get_xlat_func(dev, scsi_op); 3015 } else { 3016 if (unlikely(!scmd->cmd_len)) 3017 goto bad_cdb_len; 3018 3019 xlat_func = NULL; 3020 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3021 /* relay SCSI command to ATAPI device */ 3022 int len = COMMAND_SIZE(scsi_op); 3023 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3024 goto bad_cdb_len; 3025 3026 xlat_func = atapi_xlat; 3027 } else { 3028 /* ATA_16 passthru, treat as an ATA command */ 3029 if (unlikely(scmd->cmd_len > 16)) 3030 goto bad_cdb_len; 3031 3032 xlat_func = ata_get_xlat_func(dev, scsi_op); 3033 } 3034 } 3035 3036 if (xlat_func) 3037 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3038 else 3039 ata_scsi_simulate(dev, scmd, done); 3040 3041 return rc; 3042 3043 bad_cdb_len: 3044 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3045 scmd->cmd_len, scsi_op, dev->cdb_len); 3046 scmd->result = DID_ERROR << 16; 3047 done(scmd); 3048 return 0; 3049 } 3050 3051 /** 3052 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3053 * @cmd: SCSI command to be sent 3054 * @done: Completion function, called when command is complete 3055 * 3056 * In some cases, this function translates SCSI commands into 3057 * ATA taskfiles, and queues the taskfiles to be sent to 3058 * hardware. In other cases, this function simulates a 3059 * SCSI device by evaluating and responding to certain 3060 * SCSI commands. This creates the overall effect of 3061 * ATA and ATAPI devices appearing as SCSI devices. 3062 * 3063 * LOCKING: 3064 * Releases scsi-layer-held lock, and obtains host lock. 3065 * 3066 * RETURNS: 3067 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3068 * 0 otherwise. 3069 */ 3070 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3071 { 3072 struct ata_port *ap; 3073 struct ata_device *dev; 3074 struct scsi_device *scsidev = cmd->device; 3075 struct Scsi_Host *shost = scsidev->host; 3076 int rc = 0; 3077 3078 ap = ata_shost_to_port(shost); 3079 3080 spin_unlock(shost->host_lock); 3081 spin_lock(ap->lock); 3082 3083 ata_scsi_dump_cdb(ap, cmd); 3084 3085 dev = ata_scsi_find_dev(ap, scsidev); 3086 if (likely(dev)) 3087 rc = __ata_scsi_queuecmd(cmd, done, dev); 3088 else { 3089 cmd->result = (DID_BAD_TARGET << 16); 3090 done(cmd); 3091 } 3092 3093 spin_unlock(ap->lock); 3094 spin_lock(shost->host_lock); 3095 return rc; 3096 } 3097 3098 /** 3099 * ata_scsi_simulate - simulate SCSI command on ATA device 3100 * @dev: the target device 3101 * @cmd: SCSI command being sent to device. 3102 * @done: SCSI command completion function. 3103 * 3104 * Interprets and directly executes a select list of SCSI commands 3105 * that can be handled internally. 3106 * 3107 * LOCKING: 3108 * spin_lock_irqsave(host lock) 3109 */ 3110 3111 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3112 void (*done)(struct scsi_cmnd *)) 3113 { 3114 struct ata_scsi_args args; 3115 const u8 *scsicmd = cmd->cmnd; 3116 u8 tmp8; 3117 3118 args.dev = dev; 3119 args.id = dev->id; 3120 args.cmd = cmd; 3121 args.done = done; 3122 3123 switch(scsicmd[0]) { 3124 /* TODO: worth improving? */ 3125 case FORMAT_UNIT: 3126 ata_scsi_invalid_field(cmd, done); 3127 break; 3128 3129 case INQUIRY: 3130 if (scsicmd[1] & 2) /* is CmdDt set? */ 3131 ata_scsi_invalid_field(cmd, done); 3132 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3133 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3134 else switch (scsicmd[2]) { 3135 case 0x00: 3136 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3137 break; 3138 case 0x80: 3139 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3140 break; 3141 case 0x83: 3142 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3143 break; 3144 case 0x89: 3145 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3146 break; 3147 case 0xb1: 3148 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3149 break; 3150 default: 3151 ata_scsi_invalid_field(cmd, done); 3152 break; 3153 } 3154 break; 3155 3156 case MODE_SENSE: 3157 case MODE_SENSE_10: 3158 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3159 break; 3160 3161 case MODE_SELECT: /* unconditionally return */ 3162 case MODE_SELECT_10: /* bad-field-in-cdb */ 3163 ata_scsi_invalid_field(cmd, done); 3164 break; 3165 3166 case READ_CAPACITY: 3167 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3168 break; 3169 3170 case SERVICE_ACTION_IN: 3171 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3172 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3173 else 3174 ata_scsi_invalid_field(cmd, done); 3175 break; 3176 3177 case REPORT_LUNS: 3178 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3179 break; 3180 3181 case REQUEST_SENSE: 3182 ata_scsi_set_sense(cmd, 0, 0, 0); 3183 cmd->result = (DRIVER_SENSE << 24); 3184 done(cmd); 3185 break; 3186 3187 /* if we reach this, then writeback caching is disabled, 3188 * turning this into a no-op. 3189 */ 3190 case SYNCHRONIZE_CACHE: 3191 /* fall through */ 3192 3193 /* no-op's, complete with success */ 3194 case REZERO_UNIT: 3195 case SEEK_6: 3196 case SEEK_10: 3197 case TEST_UNIT_READY: 3198 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3199 break; 3200 3201 case SEND_DIAGNOSTIC: 3202 tmp8 = scsicmd[1] & ~(1 << 3); 3203 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3204 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3205 else 3206 ata_scsi_invalid_field(cmd, done); 3207 break; 3208 3209 /* all other commands */ 3210 default: 3211 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3212 /* "Invalid command operation code" */ 3213 done(cmd); 3214 break; 3215 } 3216 } 3217 3218 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3219 { 3220 int i, rc; 3221 3222 for (i = 0; i < host->n_ports; i++) { 3223 struct ata_port *ap = host->ports[i]; 3224 struct Scsi_Host *shost; 3225 3226 rc = -ENOMEM; 3227 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3228 if (!shost) 3229 goto err_alloc; 3230 3231 *(struct ata_port **)&shost->hostdata[0] = ap; 3232 ap->scsi_host = shost; 3233 3234 shost->transportt = &ata_scsi_transport_template; 3235 shost->unique_id = ap->print_id; 3236 shost->max_id = 16; 3237 shost->max_lun = 1; 3238 shost->max_channel = 1; 3239 shost->max_cmd_len = 16; 3240 3241 /* Schedule policy is determined by ->qc_defer() 3242 * callback and it needs to see every deferred qc. 3243 * Set host_blocked to 1 to prevent SCSI midlayer from 3244 * automatically deferring requests. 3245 */ 3246 shost->max_host_blocked = 1; 3247 3248 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3249 if (rc) 3250 goto err_add; 3251 } 3252 3253 return 0; 3254 3255 err_add: 3256 scsi_host_put(host->ports[i]->scsi_host); 3257 err_alloc: 3258 while (--i >= 0) { 3259 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3260 3261 scsi_remove_host(shost); 3262 scsi_host_put(shost); 3263 } 3264 return rc; 3265 } 3266 3267 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3268 { 3269 int tries = 5; 3270 struct ata_device *last_failed_dev = NULL; 3271 struct ata_link *link; 3272 struct ata_device *dev; 3273 3274 if (ap->flags & ATA_FLAG_DISABLED) 3275 return; 3276 3277 repeat: 3278 ata_for_each_link(link, ap, EDGE) { 3279 ata_for_each_dev(dev, link, ENABLED) { 3280 struct scsi_device *sdev; 3281 int channel = 0, id = 0; 3282 3283 if (dev->sdev) 3284 continue; 3285 3286 if (ata_is_host_link(link)) 3287 id = dev->devno; 3288 else 3289 channel = link->pmp; 3290 3291 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3292 NULL); 3293 if (!IS_ERR(sdev)) { 3294 dev->sdev = sdev; 3295 scsi_device_put(sdev); 3296 } 3297 } 3298 } 3299 3300 /* If we scanned while EH was in progress or allocation 3301 * failure occurred, scan would have failed silently. Check 3302 * whether all devices are attached. 3303 */ 3304 ata_for_each_link(link, ap, EDGE) { 3305 ata_for_each_dev(dev, link, ENABLED) { 3306 if (!dev->sdev) 3307 goto exit_loop; 3308 } 3309 } 3310 exit_loop: 3311 if (!link) 3312 return; 3313 3314 /* we're missing some SCSI devices */ 3315 if (sync) { 3316 /* If caller requested synchrnous scan && we've made 3317 * any progress, sleep briefly and repeat. 3318 */ 3319 if (dev != last_failed_dev) { 3320 msleep(100); 3321 last_failed_dev = dev; 3322 goto repeat; 3323 } 3324 3325 /* We might be failing to detect boot device, give it 3326 * a few more chances. 3327 */ 3328 if (--tries) { 3329 msleep(100); 3330 goto repeat; 3331 } 3332 3333 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3334 "failed without making any progress,\n" 3335 " switching to async\n"); 3336 } 3337 3338 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3339 round_jiffies_relative(HZ)); 3340 } 3341 3342 /** 3343 * ata_scsi_offline_dev - offline attached SCSI device 3344 * @dev: ATA device to offline attached SCSI device for 3345 * 3346 * This function is called from ata_eh_hotplug() and responsible 3347 * for taking the SCSI device attached to @dev offline. This 3348 * function is called with host lock which protects dev->sdev 3349 * against clearing. 3350 * 3351 * LOCKING: 3352 * spin_lock_irqsave(host lock) 3353 * 3354 * RETURNS: 3355 * 1 if attached SCSI device exists, 0 otherwise. 3356 */ 3357 int ata_scsi_offline_dev(struct ata_device *dev) 3358 { 3359 if (dev->sdev) { 3360 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3361 return 1; 3362 } 3363 return 0; 3364 } 3365 3366 /** 3367 * ata_scsi_remove_dev - remove attached SCSI device 3368 * @dev: ATA device to remove attached SCSI device for 3369 * 3370 * This function is called from ata_eh_scsi_hotplug() and 3371 * responsible for removing the SCSI device attached to @dev. 3372 * 3373 * LOCKING: 3374 * Kernel thread context (may sleep). 3375 */ 3376 static void ata_scsi_remove_dev(struct ata_device *dev) 3377 { 3378 struct ata_port *ap = dev->link->ap; 3379 struct scsi_device *sdev; 3380 unsigned long flags; 3381 3382 /* Alas, we need to grab scan_mutex to ensure SCSI device 3383 * state doesn't change underneath us and thus 3384 * scsi_device_get() always succeeds. The mutex locking can 3385 * be removed if there is __scsi_device_get() interface which 3386 * increments reference counts regardless of device state. 3387 */ 3388 mutex_lock(&ap->scsi_host->scan_mutex); 3389 spin_lock_irqsave(ap->lock, flags); 3390 3391 /* clearing dev->sdev is protected by host lock */ 3392 sdev = dev->sdev; 3393 dev->sdev = NULL; 3394 3395 if (sdev) { 3396 /* If user initiated unplug races with us, sdev can go 3397 * away underneath us after the host lock and 3398 * scan_mutex are released. Hold onto it. 3399 */ 3400 if (scsi_device_get(sdev) == 0) { 3401 /* The following ensures the attached sdev is 3402 * offline on return from ata_scsi_offline_dev() 3403 * regardless it wins or loses the race 3404 * against this function. 3405 */ 3406 scsi_device_set_state(sdev, SDEV_OFFLINE); 3407 } else { 3408 WARN_ON(1); 3409 sdev = NULL; 3410 } 3411 } 3412 3413 spin_unlock_irqrestore(ap->lock, flags); 3414 mutex_unlock(&ap->scsi_host->scan_mutex); 3415 3416 if (sdev) { 3417 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3418 dev_name(&sdev->sdev_gendev)); 3419 3420 scsi_remove_device(sdev); 3421 scsi_device_put(sdev); 3422 } 3423 } 3424 3425 static void ata_scsi_handle_link_detach(struct ata_link *link) 3426 { 3427 struct ata_port *ap = link->ap; 3428 struct ata_device *dev; 3429 3430 ata_for_each_dev(dev, link, ALL) { 3431 unsigned long flags; 3432 3433 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3434 continue; 3435 3436 spin_lock_irqsave(ap->lock, flags); 3437 dev->flags &= ~ATA_DFLAG_DETACHED; 3438 spin_unlock_irqrestore(ap->lock, flags); 3439 3440 ata_scsi_remove_dev(dev); 3441 } 3442 } 3443 3444 /** 3445 * ata_scsi_media_change_notify - send media change event 3446 * @dev: Pointer to the disk device with media change event 3447 * 3448 * Tell the block layer to send a media change notification 3449 * event. 3450 * 3451 * LOCKING: 3452 * spin_lock_irqsave(host lock) 3453 */ 3454 void ata_scsi_media_change_notify(struct ata_device *dev) 3455 { 3456 if (dev->sdev) 3457 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3458 GFP_ATOMIC); 3459 } 3460 3461 /** 3462 * ata_scsi_hotplug - SCSI part of hotplug 3463 * @work: Pointer to ATA port to perform SCSI hotplug on 3464 * 3465 * Perform SCSI part of hotplug. It's executed from a separate 3466 * workqueue after EH completes. This is necessary because SCSI 3467 * hot plugging requires working EH and hot unplugging is 3468 * synchronized with hot plugging with a mutex. 3469 * 3470 * LOCKING: 3471 * Kernel thread context (may sleep). 3472 */ 3473 void ata_scsi_hotplug(struct work_struct *work) 3474 { 3475 struct ata_port *ap = 3476 container_of(work, struct ata_port, hotplug_task.work); 3477 int i; 3478 3479 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3480 DPRINTK("ENTER/EXIT - unloading\n"); 3481 return; 3482 } 3483 3484 DPRINTK("ENTER\n"); 3485 3486 /* Unplug detached devices. We cannot use link iterator here 3487 * because PMP links have to be scanned even if PMP is 3488 * currently not attached. Iterate manually. 3489 */ 3490 ata_scsi_handle_link_detach(&ap->link); 3491 if (ap->pmp_link) 3492 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3493 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3494 3495 /* scan for new ones */ 3496 ata_scsi_scan_host(ap, 0); 3497 3498 DPRINTK("EXIT\n"); 3499 } 3500 3501 /** 3502 * ata_scsi_user_scan - indication for user-initiated bus scan 3503 * @shost: SCSI host to scan 3504 * @channel: Channel to scan 3505 * @id: ID to scan 3506 * @lun: LUN to scan 3507 * 3508 * This function is called when user explicitly requests bus 3509 * scan. Set probe pending flag and invoke EH. 3510 * 3511 * LOCKING: 3512 * SCSI layer (we don't care) 3513 * 3514 * RETURNS: 3515 * Zero. 3516 */ 3517 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3518 unsigned int id, unsigned int lun) 3519 { 3520 struct ata_port *ap = ata_shost_to_port(shost); 3521 unsigned long flags; 3522 int devno, rc = 0; 3523 3524 if (!ap->ops->error_handler) 3525 return -EOPNOTSUPP; 3526 3527 if (lun != SCAN_WILD_CARD && lun) 3528 return -EINVAL; 3529 3530 if (!sata_pmp_attached(ap)) { 3531 if (channel != SCAN_WILD_CARD && channel) 3532 return -EINVAL; 3533 devno = id; 3534 } else { 3535 if (id != SCAN_WILD_CARD && id) 3536 return -EINVAL; 3537 devno = channel; 3538 } 3539 3540 spin_lock_irqsave(ap->lock, flags); 3541 3542 if (devno == SCAN_WILD_CARD) { 3543 struct ata_link *link; 3544 3545 ata_for_each_link(link, ap, EDGE) { 3546 struct ata_eh_info *ehi = &link->eh_info; 3547 ehi->probe_mask |= ATA_ALL_DEVICES; 3548 ehi->action |= ATA_EH_RESET; 3549 } 3550 } else { 3551 struct ata_device *dev = ata_find_dev(ap, devno); 3552 3553 if (dev) { 3554 struct ata_eh_info *ehi = &dev->link->eh_info; 3555 ehi->probe_mask |= 1 << dev->devno; 3556 ehi->action |= ATA_EH_RESET; 3557 } else 3558 rc = -EINVAL; 3559 } 3560 3561 if (rc == 0) { 3562 ata_port_schedule_eh(ap); 3563 spin_unlock_irqrestore(ap->lock, flags); 3564 ata_port_wait_eh(ap); 3565 } else 3566 spin_unlock_irqrestore(ap->lock, flags); 3567 3568 return rc; 3569 } 3570 3571 /** 3572 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3573 * @work: Pointer to ATA port to perform scsi_rescan_device() 3574 * 3575 * After ATA pass thru (SAT) commands are executed successfully, 3576 * libata need to propagate the changes to SCSI layer. This 3577 * function must be executed from ata_aux_wq such that sdev 3578 * attach/detach don't race with rescan. 3579 * 3580 * LOCKING: 3581 * Kernel thread context (may sleep). 3582 */ 3583 void ata_scsi_dev_rescan(struct work_struct *work) 3584 { 3585 struct ata_port *ap = 3586 container_of(work, struct ata_port, scsi_rescan_task); 3587 struct ata_link *link; 3588 struct ata_device *dev; 3589 unsigned long flags; 3590 3591 spin_lock_irqsave(ap->lock, flags); 3592 3593 ata_for_each_link(link, ap, EDGE) { 3594 ata_for_each_dev(dev, link, ENABLED) { 3595 struct scsi_device *sdev = dev->sdev; 3596 3597 if (!sdev) 3598 continue; 3599 if (scsi_device_get(sdev)) 3600 continue; 3601 3602 spin_unlock_irqrestore(ap->lock, flags); 3603 scsi_rescan_device(&(sdev->sdev_gendev)); 3604 scsi_device_put(sdev); 3605 spin_lock_irqsave(ap->lock, flags); 3606 } 3607 } 3608 3609 spin_unlock_irqrestore(ap->lock, flags); 3610 } 3611 3612 /** 3613 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3614 * @host: ATA host container for all SAS ports 3615 * @port_info: Information from low-level host driver 3616 * @shost: SCSI host that the scsi device is attached to 3617 * 3618 * LOCKING: 3619 * PCI/etc. bus probe sem. 3620 * 3621 * RETURNS: 3622 * ata_port pointer on success / NULL on failure. 3623 */ 3624 3625 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3626 struct ata_port_info *port_info, 3627 struct Scsi_Host *shost) 3628 { 3629 struct ata_port *ap; 3630 3631 ap = ata_port_alloc(host); 3632 if (!ap) 3633 return NULL; 3634 3635 ap->port_no = 0; 3636 ap->lock = shost->host_lock; 3637 ap->pio_mask = port_info->pio_mask; 3638 ap->mwdma_mask = port_info->mwdma_mask; 3639 ap->udma_mask = port_info->udma_mask; 3640 ap->flags |= port_info->flags; 3641 ap->ops = port_info->port_ops; 3642 ap->cbl = ATA_CBL_SATA; 3643 3644 return ap; 3645 } 3646 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3647 3648 /** 3649 * ata_sas_port_start - Set port up for dma. 3650 * @ap: Port to initialize 3651 * 3652 * Called just after data structures for each port are 3653 * initialized. 3654 * 3655 * May be used as the port_start() entry in ata_port_operations. 3656 * 3657 * LOCKING: 3658 * Inherited from caller. 3659 */ 3660 int ata_sas_port_start(struct ata_port *ap) 3661 { 3662 return 0; 3663 } 3664 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3665 3666 /** 3667 * ata_port_stop - Undo ata_sas_port_start() 3668 * @ap: Port to shut down 3669 * 3670 * May be used as the port_stop() entry in ata_port_operations. 3671 * 3672 * LOCKING: 3673 * Inherited from caller. 3674 */ 3675 3676 void ata_sas_port_stop(struct ata_port *ap) 3677 { 3678 } 3679 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3680 3681 /** 3682 * ata_sas_port_init - Initialize a SATA device 3683 * @ap: SATA port to initialize 3684 * 3685 * LOCKING: 3686 * PCI/etc. bus probe sem. 3687 * 3688 * RETURNS: 3689 * Zero on success, non-zero on error. 3690 */ 3691 3692 int ata_sas_port_init(struct ata_port *ap) 3693 { 3694 int rc = ap->ops->port_start(ap); 3695 3696 if (!rc) { 3697 ap->print_id = ata_print_id++; 3698 rc = ata_bus_probe(ap); 3699 } 3700 3701 return rc; 3702 } 3703 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3704 3705 /** 3706 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3707 * @ap: SATA port to destroy 3708 * 3709 */ 3710 3711 void ata_sas_port_destroy(struct ata_port *ap) 3712 { 3713 if (ap->ops->port_stop) 3714 ap->ops->port_stop(ap); 3715 kfree(ap); 3716 } 3717 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3718 3719 /** 3720 * ata_sas_slave_configure - Default slave_config routine for libata devices 3721 * @sdev: SCSI device to configure 3722 * @ap: ATA port to which SCSI device is attached 3723 * 3724 * RETURNS: 3725 * Zero. 3726 */ 3727 3728 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3729 { 3730 ata_scsi_sdev_config(sdev); 3731 ata_scsi_dev_config(sdev, ap->link.device); 3732 return 0; 3733 } 3734 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3735 3736 /** 3737 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3738 * @cmd: SCSI command to be sent 3739 * @done: Completion function, called when command is complete 3740 * @ap: ATA port to which the command is being sent 3741 * 3742 * RETURNS: 3743 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3744 * 0 otherwise. 3745 */ 3746 3747 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3748 struct ata_port *ap) 3749 { 3750 int rc = 0; 3751 3752 ata_scsi_dump_cdb(ap, cmd); 3753 3754 if (likely(ata_dev_enabled(ap->link.device))) 3755 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3756 else { 3757 cmd->result = (DID_BAD_TARGET << 16); 3758 done(cmd); 3759 } 3760 return rc; 3761 } 3762 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3763