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_IWUSR, 317 ata_scsi_em_message_show, ata_scsi_em_message_store); 318 EXPORT_SYMBOL_GPL(dev_attr_em_message); 319 320 static ssize_t 321 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 322 char *buf) 323 { 324 struct Scsi_Host *shost = class_to_shost(dev); 325 struct ata_port *ap = ata_shost_to_port(shost); 326 327 return snprintf(buf, 23, "%d\n", ap->em_message_type); 328 } 329 DEVICE_ATTR(em_message_type, S_IRUGO, 330 ata_scsi_em_message_type_show, NULL); 331 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 332 333 static ssize_t 334 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 341 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY)) 342 return ap->ops->sw_activity_show(atadev, buf); 343 return -EINVAL; 344 } 345 346 static ssize_t 347 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 348 const char *buf, size_t count) 349 { 350 struct scsi_device *sdev = to_scsi_device(dev); 351 struct ata_port *ap = ata_shost_to_port(sdev->host); 352 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 353 enum sw_activity val; 354 int rc; 355 356 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 357 val = simple_strtoul(buf, NULL, 0); 358 switch (val) { 359 case OFF: case BLINK_ON: case BLINK_OFF: 360 rc = ap->ops->sw_activity_store(atadev, val); 361 if (!rc) 362 return count; 363 else 364 return rc; 365 } 366 } 367 return -EINVAL; 368 } 369 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 370 ata_scsi_activity_store); 371 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 372 373 struct device_attribute *ata_common_sdev_attrs[] = { 374 &dev_attr_unload_heads, 375 NULL 376 }; 377 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 378 379 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 380 void (*done)(struct scsi_cmnd *)) 381 { 382 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 383 /* "Invalid field in cbd" */ 384 done(cmd); 385 } 386 387 /** 388 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 389 * @sdev: SCSI device for which BIOS geometry is to be determined 390 * @bdev: block device associated with @sdev 391 * @capacity: capacity of SCSI device 392 * @geom: location to which geometry will be output 393 * 394 * Generic bios head/sector/cylinder calculator 395 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 396 * mapping. Some situations may arise where the disk is not 397 * bootable if this is not used. 398 * 399 * LOCKING: 400 * Defined by the SCSI layer. We don't really care. 401 * 402 * RETURNS: 403 * Zero. 404 */ 405 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 406 sector_t capacity, int geom[]) 407 { 408 geom[0] = 255; 409 geom[1] = 63; 410 sector_div(capacity, 255*63); 411 geom[2] = capacity; 412 413 return 0; 414 } 415 416 /** 417 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 418 * @ap: target port 419 * @sdev: SCSI device to get identify data for 420 * @arg: User buffer area for identify data 421 * 422 * LOCKING: 423 * Defined by the SCSI layer. We don't really care. 424 * 425 * RETURNS: 426 * Zero on success, negative errno on error. 427 */ 428 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 429 void __user *arg) 430 { 431 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 432 u16 __user *dst = arg; 433 char buf[40]; 434 435 if (!dev) 436 return -ENOMSG; 437 438 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 439 return -EFAULT; 440 441 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 442 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 443 return -EFAULT; 444 445 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 446 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 447 return -EFAULT; 448 449 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 450 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 451 return -EFAULT; 452 453 return 0; 454 } 455 456 /** 457 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 458 * @scsidev: Device to which we are issuing command 459 * @arg: User provided data for issuing command 460 * 461 * LOCKING: 462 * Defined by the SCSI layer. We don't really care. 463 * 464 * RETURNS: 465 * Zero on success, negative errno on error. 466 */ 467 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 468 { 469 int rc = 0; 470 u8 scsi_cmd[MAX_COMMAND_SIZE]; 471 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 472 int argsize = 0; 473 enum dma_data_direction data_dir; 474 int cmd_result; 475 476 if (arg == NULL) 477 return -EINVAL; 478 479 if (copy_from_user(args, arg, sizeof(args))) 480 return -EFAULT; 481 482 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 483 if (!sensebuf) 484 return -ENOMEM; 485 486 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 487 488 if (args[3]) { 489 argsize = SECTOR_SIZE * args[3]; 490 argbuf = kmalloc(argsize, GFP_KERNEL); 491 if (argbuf == NULL) { 492 rc = -ENOMEM; 493 goto error; 494 } 495 496 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 497 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 498 block count in sector count field */ 499 data_dir = DMA_FROM_DEVICE; 500 } else { 501 scsi_cmd[1] = (3 << 1); /* Non-data */ 502 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 503 data_dir = DMA_NONE; 504 } 505 506 scsi_cmd[0] = ATA_16; 507 508 scsi_cmd[4] = args[2]; 509 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 510 scsi_cmd[6] = args[3]; 511 scsi_cmd[8] = args[1]; 512 scsi_cmd[10] = 0x4f; 513 scsi_cmd[12] = 0xc2; 514 } else { 515 scsi_cmd[6] = args[1]; 516 } 517 scsi_cmd[14] = args[0]; 518 519 /* Good values for timeout and retries? Values below 520 from scsi_ioctl_send_command() for default case... */ 521 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 522 sensebuf, (10*HZ), 5, 0, NULL); 523 524 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 525 u8 *desc = sensebuf + 8; 526 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 527 528 /* If we set cc then ATA pass-through will cause a 529 * check condition even if no error. Filter that. */ 530 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 531 struct scsi_sense_hdr sshdr; 532 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 533 &sshdr); 534 if (sshdr.sense_key == 0 && 535 sshdr.asc == 0 && sshdr.ascq == 0) 536 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 537 } 538 539 /* Send userspace a few ATA registers (same as drivers/ide) */ 540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 541 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 542 args[0] = desc[13]; /* status */ 543 args[1] = desc[3]; /* error */ 544 args[2] = desc[5]; /* sector count (0:7) */ 545 if (copy_to_user(arg, args, sizeof(args))) 546 rc = -EFAULT; 547 } 548 } 549 550 551 if (cmd_result) { 552 rc = -EIO; 553 goto error; 554 } 555 556 if ((argbuf) 557 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 558 rc = -EFAULT; 559 error: 560 kfree(sensebuf); 561 kfree(argbuf); 562 return rc; 563 } 564 565 /** 566 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 567 * @scsidev: Device to which we are issuing command 568 * @arg: User provided data for issuing command 569 * 570 * LOCKING: 571 * Defined by the SCSI layer. We don't really care. 572 * 573 * RETURNS: 574 * Zero on success, negative errno on error. 575 */ 576 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 577 { 578 int rc = 0; 579 u8 scsi_cmd[MAX_COMMAND_SIZE]; 580 u8 args[7], *sensebuf = NULL; 581 int cmd_result; 582 583 if (arg == NULL) 584 return -EINVAL; 585 586 if (copy_from_user(args, arg, sizeof(args))) 587 return -EFAULT; 588 589 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 590 if (!sensebuf) 591 return -ENOMEM; 592 593 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 594 scsi_cmd[0] = ATA_16; 595 scsi_cmd[1] = (3 << 1); /* Non-data */ 596 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 597 scsi_cmd[4] = args[1]; 598 scsi_cmd[6] = args[2]; 599 scsi_cmd[8] = args[3]; 600 scsi_cmd[10] = args[4]; 601 scsi_cmd[12] = args[5]; 602 scsi_cmd[13] = args[6] & 0x4f; 603 scsi_cmd[14] = args[0]; 604 605 /* Good values for timeout and retries? Values below 606 from scsi_ioctl_send_command() for default case... */ 607 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 608 sensebuf, (10*HZ), 5, 0, NULL); 609 610 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 611 u8 *desc = sensebuf + 8; 612 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 613 614 /* If we set cc then ATA pass-through will cause a 615 * check condition even if no error. Filter that. */ 616 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 617 struct scsi_sense_hdr sshdr; 618 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 619 &sshdr); 620 if (sshdr.sense_key == 0 && 621 sshdr.asc == 0 && sshdr.ascq == 0) 622 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 623 } 624 625 /* Send userspace ATA registers */ 626 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 627 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 628 args[0] = desc[13]; /* status */ 629 args[1] = desc[3]; /* error */ 630 args[2] = desc[5]; /* sector count (0:7) */ 631 args[3] = desc[7]; /* lbal */ 632 args[4] = desc[9]; /* lbam */ 633 args[5] = desc[11]; /* lbah */ 634 args[6] = desc[12]; /* select */ 635 if (copy_to_user(arg, args, sizeof(args))) 636 rc = -EFAULT; 637 } 638 } 639 640 if (cmd_result) { 641 rc = -EIO; 642 goto error; 643 } 644 645 error: 646 kfree(sensebuf); 647 return rc; 648 } 649 650 static int ata_ioc32(struct ata_port *ap) 651 { 652 if (ap->flags & ATA_FLAG_PIO_DMA) 653 return 1; 654 if (ap->pflags & ATA_PFLAG_PIO32) 655 return 1; 656 return 0; 657 } 658 659 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 660 int cmd, void __user *arg) 661 { 662 int val = -EINVAL, rc = -EINVAL; 663 unsigned long flags; 664 665 switch (cmd) { 666 case ATA_IOC_GET_IO32: 667 spin_lock_irqsave(ap->lock, flags); 668 val = ata_ioc32(ap); 669 spin_unlock_irqrestore(ap->lock, flags); 670 if (copy_to_user(arg, &val, 1)) 671 return -EFAULT; 672 return 0; 673 674 case ATA_IOC_SET_IO32: 675 val = (unsigned long) arg; 676 rc = 0; 677 spin_lock_irqsave(ap->lock, flags); 678 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 679 if (val) 680 ap->pflags |= ATA_PFLAG_PIO32; 681 else 682 ap->pflags &= ~ATA_PFLAG_PIO32; 683 } else { 684 if (val != ata_ioc32(ap)) 685 rc = -EINVAL; 686 } 687 spin_unlock_irqrestore(ap->lock, flags); 688 return rc; 689 690 case HDIO_GET_IDENTITY: 691 return ata_get_identity(ap, scsidev, arg); 692 693 case HDIO_DRIVE_CMD: 694 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 695 return -EACCES; 696 return ata_cmd_ioctl(scsidev, arg); 697 698 case HDIO_DRIVE_TASK: 699 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 700 return -EACCES; 701 return ata_task_ioctl(scsidev, arg); 702 703 default: 704 rc = -ENOTTY; 705 break; 706 } 707 708 return rc; 709 } 710 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 711 712 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 713 { 714 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 715 scsidev, cmd, arg); 716 } 717 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 718 719 /** 720 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 721 * @dev: ATA device to which the new command is attached 722 * @cmd: SCSI command that originated this ATA command 723 * @done: SCSI command completion function 724 * 725 * Obtain a reference to an unused ata_queued_cmd structure, 726 * which is the basic libata structure representing a single 727 * ATA command sent to the hardware. 728 * 729 * If a command was available, fill in the SCSI-specific 730 * portions of the structure with information on the 731 * current command. 732 * 733 * LOCKING: 734 * spin_lock_irqsave(host lock) 735 * 736 * RETURNS: 737 * Command allocated, or %NULL if none available. 738 */ 739 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 740 struct scsi_cmnd *cmd, 741 void (*done)(struct scsi_cmnd *)) 742 { 743 struct ata_queued_cmd *qc; 744 745 qc = ata_qc_new_init(dev); 746 if (qc) { 747 qc->scsicmd = cmd; 748 qc->scsidone = done; 749 750 qc->sg = scsi_sglist(cmd); 751 qc->n_elem = scsi_sg_count(cmd); 752 } else { 753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 754 done(cmd); 755 } 756 757 return qc; 758 } 759 760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 761 { 762 struct scsi_cmnd *scmd = qc->scsicmd; 763 764 qc->extrabytes = scmd->request->extra_len; 765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 766 } 767 768 /** 769 * ata_dump_status - user friendly display of error info 770 * @id: id of the port in question 771 * @tf: ptr to filled out taskfile 772 * 773 * Decode and dump the ATA error/status registers for the user so 774 * that they have some idea what really happened at the non 775 * make-believe layer. 776 * 777 * LOCKING: 778 * inherited from caller 779 */ 780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 781 { 782 u8 stat = tf->command, err = tf->feature; 783 784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 785 if (stat & ATA_BUSY) { 786 printk("Busy }\n"); /* Data is not valid in this case */ 787 } else { 788 if (stat & 0x40) printk("DriveReady "); 789 if (stat & 0x20) printk("DeviceFault "); 790 if (stat & 0x10) printk("SeekComplete "); 791 if (stat & 0x08) printk("DataRequest "); 792 if (stat & 0x04) printk("CorrectedError "); 793 if (stat & 0x02) printk("Index "); 794 if (stat & 0x01) printk("Error "); 795 printk("}\n"); 796 797 if (err) { 798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 799 if (err & 0x04) printk("DriveStatusError "); 800 if (err & 0x80) { 801 if (err & 0x04) printk("BadCRC "); 802 else printk("Sector "); 803 } 804 if (err & 0x40) printk("UncorrectableError "); 805 if (err & 0x10) printk("SectorIdNotFound "); 806 if (err & 0x02) printk("TrackZeroNotFound "); 807 if (err & 0x01) printk("AddrMarkNotFound "); 808 printk("}\n"); 809 } 810 } 811 } 812 813 /** 814 * ata_to_sense_error - convert ATA error to SCSI error 815 * @id: ATA device number 816 * @drv_stat: value contained in ATA status register 817 * @drv_err: value contained in ATA error register 818 * @sk: the sense key we'll fill out 819 * @asc: the additional sense code we'll fill out 820 * @ascq: the additional sense code qualifier we'll fill out 821 * @verbose: be verbose 822 * 823 * Converts an ATA error into a SCSI error. Fill out pointers to 824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 825 * format sense blocks. 826 * 827 * LOCKING: 828 * spin_lock_irqsave(host lock) 829 */ 830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 831 u8 *asc, u8 *ascq, int verbose) 832 { 833 int i; 834 835 /* Based on the 3ware driver translation table */ 836 static const unsigned char sense_table[][4] = { 837 /* BBD|ECC|ID|MAR */ 838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 839 /* BBD|ECC|ID */ 840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 841 /* ECC|MC|MARK */ 842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 845 /* MC|ID|ABRT|TRK0|MARK */ 846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 847 /* MCR|MARK */ 848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 849 /* Bad address mark */ 850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 851 /* TRK0 */ 852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 853 /* Abort & !ICRC */ 854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 855 /* Media change request */ 856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 857 /* SRV */ 858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 859 /* Media change */ 860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 861 /* ECC */ 862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 863 /* BBD - block marked bad */ 864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 866 }; 867 static const unsigned char stat_table[][4] = { 868 /* Must be first because BUSY means no other bits valid */ 869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 870 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 874 }; 875 876 /* 877 * Is this an error we can process/parse 878 */ 879 if (drv_stat & ATA_BUSY) { 880 drv_err = 0; /* Ignore the err bits, they're invalid */ 881 } 882 883 if (drv_err) { 884 /* Look for drv_err */ 885 for (i = 0; sense_table[i][0] != 0xFF; i++) { 886 /* Look for best matches first */ 887 if ((sense_table[i][0] & drv_err) == 888 sense_table[i][0]) { 889 *sk = sense_table[i][1]; 890 *asc = sense_table[i][2]; 891 *ascq = sense_table[i][3]; 892 goto translate_done; 893 } 894 } 895 /* No immediate match */ 896 if (verbose) 897 printk(KERN_WARNING "ata%u: no sense translation for " 898 "error 0x%02x\n", id, drv_err); 899 } 900 901 /* Fall back to interpreting status bits */ 902 for (i = 0; stat_table[i][0] != 0xFF; i++) { 903 if (stat_table[i][0] & drv_stat) { 904 *sk = stat_table[i][1]; 905 *asc = stat_table[i][2]; 906 *ascq = stat_table[i][3]; 907 goto translate_done; 908 } 909 } 910 /* No error? Undecoded? */ 911 if (verbose) 912 printk(KERN_WARNING "ata%u: no sense translation for " 913 "status: 0x%02x\n", id, drv_stat); 914 915 /* We need a sensible error return here, which is tricky, and one 916 that won't cause people to do things like return a disk wrongly */ 917 *sk = ABORTED_COMMAND; 918 *asc = 0x00; 919 *ascq = 0x00; 920 921 translate_done: 922 if (verbose) 923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 925 id, drv_stat, drv_err, *sk, *asc, *ascq); 926 return; 927 } 928 929 /* 930 * ata_gen_passthru_sense - Generate check condition sense block. 931 * @qc: Command that completed. 932 * 933 * This function is specific to the ATA descriptor format sense 934 * block specified for the ATA pass through commands. Regardless 935 * of whether the command errored or not, return a sense 936 * block. Copy all controller registers into the sense 937 * block. Clear sense key, ASC & ASCQ if there is no error. 938 * 939 * LOCKING: 940 * None. 941 */ 942 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 943 { 944 struct scsi_cmnd *cmd = qc->scsicmd; 945 struct ata_taskfile *tf = &qc->result_tf; 946 unsigned char *sb = cmd->sense_buffer; 947 unsigned char *desc = sb + 8; 948 int verbose = qc->ap->ops->error_handler == NULL; 949 950 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 951 952 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 953 954 /* 955 * Use ata_to_sense_error() to map status register bits 956 * onto sense key, asc & ascq. 957 */ 958 if (qc->err_mask || 959 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 960 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 961 &sb[1], &sb[2], &sb[3], verbose); 962 sb[1] &= 0x0f; 963 } 964 965 /* 966 * Sense data is current and format is descriptor. 967 */ 968 sb[0] = 0x72; 969 970 desc[0] = 0x09; 971 972 /* set length of additional sense data */ 973 sb[7] = 14; 974 desc[1] = 12; 975 976 /* 977 * Copy registers into sense buffer. 978 */ 979 desc[2] = 0x00; 980 desc[3] = tf->feature; /* == error reg */ 981 desc[5] = tf->nsect; 982 desc[7] = tf->lbal; 983 desc[9] = tf->lbam; 984 desc[11] = tf->lbah; 985 desc[12] = tf->device; 986 desc[13] = tf->command; /* == status reg */ 987 988 /* 989 * Fill in Extend bit, and the high order bytes 990 * if applicable. 991 */ 992 if (tf->flags & ATA_TFLAG_LBA48) { 993 desc[2] |= 0x01; 994 desc[4] = tf->hob_nsect; 995 desc[6] = tf->hob_lbal; 996 desc[8] = tf->hob_lbam; 997 desc[10] = tf->hob_lbah; 998 } 999 } 1000 1001 /** 1002 * ata_gen_ata_sense - generate a SCSI fixed sense block 1003 * @qc: Command that we are erroring out 1004 * 1005 * Generate sense block for a failed ATA command @qc. Descriptor 1006 * format is used to accomodate LBA48 block address. 1007 * 1008 * LOCKING: 1009 * None. 1010 */ 1011 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1012 { 1013 struct ata_device *dev = qc->dev; 1014 struct scsi_cmnd *cmd = qc->scsicmd; 1015 struct ata_taskfile *tf = &qc->result_tf; 1016 unsigned char *sb = cmd->sense_buffer; 1017 unsigned char *desc = sb + 8; 1018 int verbose = qc->ap->ops->error_handler == NULL; 1019 u64 block; 1020 1021 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1022 1023 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1024 1025 /* sense data is current and format is descriptor */ 1026 sb[0] = 0x72; 1027 1028 /* Use ata_to_sense_error() to map status register bits 1029 * onto sense key, asc & ascq. 1030 */ 1031 if (qc->err_mask || 1032 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1033 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1034 &sb[1], &sb[2], &sb[3], verbose); 1035 sb[1] &= 0x0f; 1036 } 1037 1038 block = ata_tf_read_block(&qc->result_tf, dev); 1039 1040 /* information sense data descriptor */ 1041 sb[7] = 12; 1042 desc[0] = 0x00; 1043 desc[1] = 10; 1044 1045 desc[2] |= 0x80; /* valid */ 1046 desc[6] = block >> 40; 1047 desc[7] = block >> 32; 1048 desc[8] = block >> 24; 1049 desc[9] = block >> 16; 1050 desc[10] = block >> 8; 1051 desc[11] = block; 1052 } 1053 1054 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1055 { 1056 sdev->use_10_for_rw = 1; 1057 sdev->use_10_for_ms = 1; 1058 1059 /* Schedule policy is determined by ->qc_defer() callback and 1060 * it needs to see every deferred qc. Set dev_blocked to 1 to 1061 * prevent SCSI midlayer from automatically deferring 1062 * requests. 1063 */ 1064 sdev->max_device_blocked = 1; 1065 } 1066 1067 /** 1068 * atapi_drain_needed - Check whether data transfer may overflow 1069 * @rq: request to be checked 1070 * 1071 * ATAPI commands which transfer variable length data to host 1072 * might overflow due to application error or hardare bug. This 1073 * function checks whether overflow should be drained and ignored 1074 * for @request. 1075 * 1076 * LOCKING: 1077 * None. 1078 * 1079 * RETURNS: 1080 * 1 if ; otherwise, 0. 1081 */ 1082 static int atapi_drain_needed(struct request *rq) 1083 { 1084 if (likely(!blk_pc_request(rq))) 1085 return 0; 1086 1087 if (!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 int form_factor = ata_id_form_factor(args->id); 2146 int media_rotation_rate = ata_id_rotation_rate(args->id); 2147 2148 rbuf[1] = 0xb1; 2149 rbuf[3] = 0x3c; 2150 rbuf[4] = media_rotation_rate >> 8; 2151 rbuf[5] = media_rotation_rate; 2152 rbuf[7] = form_factor; 2153 2154 return 0; 2155 } 2156 2157 /** 2158 * ata_scsiop_noop - Command handler that simply returns success. 2159 * @args: device IDENTIFY data / SCSI command of interest. 2160 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2161 * 2162 * No operation. Simply returns success to caller, to indicate 2163 * that the caller should successfully complete this SCSI command. 2164 * 2165 * LOCKING: 2166 * spin_lock_irqsave(host lock) 2167 */ 2168 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2169 { 2170 VPRINTK("ENTER\n"); 2171 return 0; 2172 } 2173 2174 /** 2175 * ata_msense_caching - Simulate MODE SENSE caching info page 2176 * @id: device IDENTIFY data 2177 * @buf: output buffer 2178 * 2179 * Generate a caching info page, which conditionally indicates 2180 * write caching to the SCSI layer, depending on device 2181 * capabilities. 2182 * 2183 * LOCKING: 2184 * None. 2185 */ 2186 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2187 { 2188 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2189 if (ata_id_wcache_enabled(id)) 2190 buf[2] |= (1 << 2); /* write cache enable */ 2191 if (!ata_id_rahead_enabled(id)) 2192 buf[12] |= (1 << 5); /* disable read ahead */ 2193 return sizeof(def_cache_mpage); 2194 } 2195 2196 /** 2197 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2198 * @buf: output buffer 2199 * 2200 * Generate a generic MODE SENSE control mode page. 2201 * 2202 * LOCKING: 2203 * None. 2204 */ 2205 static unsigned int ata_msense_ctl_mode(u8 *buf) 2206 { 2207 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2208 return sizeof(def_control_mpage); 2209 } 2210 2211 /** 2212 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2213 * @buf: output buffer 2214 * 2215 * Generate a generic MODE SENSE r/w error recovery page. 2216 * 2217 * LOCKING: 2218 * None. 2219 */ 2220 static unsigned int ata_msense_rw_recovery(u8 *buf) 2221 { 2222 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2223 return sizeof(def_rw_recovery_mpage); 2224 } 2225 2226 /* 2227 * We can turn this into a real blacklist if it's needed, for now just 2228 * blacklist any Maxtor BANC1G10 revision firmware 2229 */ 2230 static int ata_dev_supports_fua(u16 *id) 2231 { 2232 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2233 2234 if (!libata_fua) 2235 return 0; 2236 if (!ata_id_has_fua(id)) 2237 return 0; 2238 2239 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2240 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2241 2242 if (strcmp(model, "Maxtor")) 2243 return 1; 2244 if (strcmp(fw, "BANC1G10")) 2245 return 1; 2246 2247 return 0; /* blacklisted */ 2248 } 2249 2250 /** 2251 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2252 * @args: device IDENTIFY data / SCSI command of interest. 2253 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2254 * 2255 * Simulate MODE SENSE commands. Assume this is invoked for direct 2256 * access devices (e.g. disks) only. There should be no block 2257 * descriptor for other device types. 2258 * 2259 * LOCKING: 2260 * spin_lock_irqsave(host lock) 2261 */ 2262 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2263 { 2264 struct ata_device *dev = args->dev; 2265 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2266 const u8 sat_blk_desc[] = { 2267 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2268 0, 2269 0, 0x2, 0x0 /* block length: 512 bytes */ 2270 }; 2271 u8 pg, spg; 2272 unsigned int ebd, page_control, six_byte; 2273 u8 dpofua; 2274 2275 VPRINTK("ENTER\n"); 2276 2277 six_byte = (scsicmd[0] == MODE_SENSE); 2278 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2279 /* 2280 * LLBA bit in msense(10) ignored (compliant) 2281 */ 2282 2283 page_control = scsicmd[2] >> 6; 2284 switch (page_control) { 2285 case 0: /* current */ 2286 break; /* supported */ 2287 case 3: /* saved */ 2288 goto saving_not_supp; 2289 case 1: /* changeable */ 2290 case 2: /* defaults */ 2291 default: 2292 goto invalid_fld; 2293 } 2294 2295 if (six_byte) 2296 p += 4 + (ebd ? 8 : 0); 2297 else 2298 p += 8 + (ebd ? 8 : 0); 2299 2300 pg = scsicmd[2] & 0x3f; 2301 spg = scsicmd[3]; 2302 /* 2303 * No mode subpages supported (yet) but asking for _all_ 2304 * subpages may be valid 2305 */ 2306 if (spg && (spg != ALL_SUB_MPAGES)) 2307 goto invalid_fld; 2308 2309 switch(pg) { 2310 case RW_RECOVERY_MPAGE: 2311 p += ata_msense_rw_recovery(p); 2312 break; 2313 2314 case CACHE_MPAGE: 2315 p += ata_msense_caching(args->id, p); 2316 break; 2317 2318 case CONTROL_MPAGE: 2319 p += ata_msense_ctl_mode(p); 2320 break; 2321 2322 case ALL_MPAGES: 2323 p += ata_msense_rw_recovery(p); 2324 p += ata_msense_caching(args->id, p); 2325 p += ata_msense_ctl_mode(p); 2326 break; 2327 2328 default: /* invalid page code */ 2329 goto invalid_fld; 2330 } 2331 2332 dpofua = 0; 2333 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2334 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2335 dpofua = 1 << 4; 2336 2337 if (six_byte) { 2338 rbuf[0] = p - rbuf - 1; 2339 rbuf[2] |= dpofua; 2340 if (ebd) { 2341 rbuf[3] = sizeof(sat_blk_desc); 2342 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2343 } 2344 } else { 2345 unsigned int output_len = p - rbuf - 2; 2346 2347 rbuf[0] = output_len >> 8; 2348 rbuf[1] = output_len; 2349 rbuf[3] |= dpofua; 2350 if (ebd) { 2351 rbuf[7] = sizeof(sat_blk_desc); 2352 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2353 } 2354 } 2355 return 0; 2356 2357 invalid_fld: 2358 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2359 /* "Invalid field in cbd" */ 2360 return 1; 2361 2362 saving_not_supp: 2363 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2364 /* "Saving parameters not supported" */ 2365 return 1; 2366 } 2367 2368 /** 2369 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2370 * @args: device IDENTIFY data / SCSI command of interest. 2371 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2372 * 2373 * Simulate READ CAPACITY commands. 2374 * 2375 * LOCKING: 2376 * None. 2377 */ 2378 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2379 { 2380 struct ata_device *dev = args->dev; 2381 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2382 u8 log_per_phys = 0; 2383 u16 lowest_aligned = 0; 2384 u16 word_106 = dev->id[106]; 2385 u16 word_209 = dev->id[209]; 2386 2387 if ((word_106 & 0xc000) == 0x4000) { 2388 /* Number and offset of logical sectors per physical sector */ 2389 if (word_106 & (1 << 13)) 2390 log_per_phys = word_106 & 0xf; 2391 if ((word_209 & 0xc000) == 0x4000) { 2392 u16 first = dev->id[209] & 0x3fff; 2393 if (first > 0) 2394 lowest_aligned = (1 << log_per_phys) - first; 2395 } 2396 } 2397 2398 VPRINTK("ENTER\n"); 2399 2400 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2401 if (last_lba >= 0xffffffffULL) 2402 last_lba = 0xffffffff; 2403 2404 /* sector count, 32-bit */ 2405 rbuf[0] = last_lba >> (8 * 3); 2406 rbuf[1] = last_lba >> (8 * 2); 2407 rbuf[2] = last_lba >> (8 * 1); 2408 rbuf[3] = last_lba; 2409 2410 /* sector size */ 2411 rbuf[6] = ATA_SECT_SIZE >> 8; 2412 rbuf[7] = ATA_SECT_SIZE & 0xff; 2413 } else { 2414 /* sector count, 64-bit */ 2415 rbuf[0] = last_lba >> (8 * 7); 2416 rbuf[1] = last_lba >> (8 * 6); 2417 rbuf[2] = last_lba >> (8 * 5); 2418 rbuf[3] = last_lba >> (8 * 4); 2419 rbuf[4] = last_lba >> (8 * 3); 2420 rbuf[5] = last_lba >> (8 * 2); 2421 rbuf[6] = last_lba >> (8 * 1); 2422 rbuf[7] = last_lba; 2423 2424 /* sector size */ 2425 rbuf[10] = ATA_SECT_SIZE >> 8; 2426 rbuf[11] = ATA_SECT_SIZE & 0xff; 2427 2428 rbuf[12] = 0; 2429 rbuf[13] = log_per_phys; 2430 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2431 rbuf[15] = lowest_aligned; 2432 } 2433 2434 return 0; 2435 } 2436 2437 /** 2438 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2439 * @args: device IDENTIFY data / SCSI command of interest. 2440 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2441 * 2442 * Simulate REPORT LUNS command. 2443 * 2444 * LOCKING: 2445 * spin_lock_irqsave(host lock) 2446 */ 2447 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2448 { 2449 VPRINTK("ENTER\n"); 2450 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2451 2452 return 0; 2453 } 2454 2455 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2456 { 2457 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2458 /* FIXME: not quite right; we don't want the 2459 * translation of taskfile registers into 2460 * a sense descriptors, since that's only 2461 * correct for ATA, not ATAPI 2462 */ 2463 ata_gen_passthru_sense(qc); 2464 } 2465 2466 qc->scsidone(qc->scsicmd); 2467 ata_qc_free(qc); 2468 } 2469 2470 /* is it pointless to prefer PIO for "safety reasons"? */ 2471 static inline int ata_pio_use_silly(struct ata_port *ap) 2472 { 2473 return (ap->flags & ATA_FLAG_PIO_DMA); 2474 } 2475 2476 static void atapi_request_sense(struct ata_queued_cmd *qc) 2477 { 2478 struct ata_port *ap = qc->ap; 2479 struct scsi_cmnd *cmd = qc->scsicmd; 2480 2481 DPRINTK("ATAPI request sense\n"); 2482 2483 /* FIXME: is this needed? */ 2484 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2485 2486 #ifdef CONFIG_ATA_SFF 2487 if (ap->ops->sff_tf_read) 2488 ap->ops->sff_tf_read(ap, &qc->tf); 2489 #endif 2490 2491 /* fill these in, for the case where they are -not- overwritten */ 2492 cmd->sense_buffer[0] = 0x70; 2493 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2494 2495 ata_qc_reinit(qc); 2496 2497 /* setup sg table and init transfer direction */ 2498 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2499 ata_sg_init(qc, &qc->sgent, 1); 2500 qc->dma_dir = DMA_FROM_DEVICE; 2501 2502 memset(&qc->cdb, 0, qc->dev->cdb_len); 2503 qc->cdb[0] = REQUEST_SENSE; 2504 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2505 2506 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2507 qc->tf.command = ATA_CMD_PACKET; 2508 2509 if (ata_pio_use_silly(ap)) { 2510 qc->tf.protocol = ATAPI_PROT_DMA; 2511 qc->tf.feature |= ATAPI_PKT_DMA; 2512 } else { 2513 qc->tf.protocol = ATAPI_PROT_PIO; 2514 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2515 qc->tf.lbah = 0; 2516 } 2517 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2518 2519 qc->complete_fn = atapi_sense_complete; 2520 2521 ata_qc_issue(qc); 2522 2523 DPRINTK("EXIT\n"); 2524 } 2525 2526 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2527 { 2528 struct scsi_cmnd *cmd = qc->scsicmd; 2529 unsigned int err_mask = qc->err_mask; 2530 2531 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2532 2533 /* handle completion from new EH */ 2534 if (unlikely(qc->ap->ops->error_handler && 2535 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2536 2537 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2538 /* FIXME: not quite right; we don't want the 2539 * translation of taskfile registers into a 2540 * sense descriptors, since that's only 2541 * correct for ATA, not ATAPI 2542 */ 2543 ata_gen_passthru_sense(qc); 2544 } 2545 2546 /* SCSI EH automatically locks door if sdev->locked is 2547 * set. Sometimes door lock request continues to 2548 * fail, for example, when no media is present. This 2549 * creates a loop - SCSI EH issues door lock which 2550 * fails and gets invoked again to acquire sense data 2551 * for the failed command. 2552 * 2553 * If door lock fails, always clear sdev->locked to 2554 * avoid this infinite loop. 2555 */ 2556 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2557 qc->dev->sdev->locked = 0; 2558 2559 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2560 qc->scsidone(cmd); 2561 ata_qc_free(qc); 2562 return; 2563 } 2564 2565 /* successful completion or old EH failure path */ 2566 if (unlikely(err_mask & AC_ERR_DEV)) { 2567 cmd->result = SAM_STAT_CHECK_CONDITION; 2568 atapi_request_sense(qc); 2569 return; 2570 } else if (unlikely(err_mask)) { 2571 /* FIXME: not quite right; we don't want the 2572 * translation of taskfile registers into 2573 * a sense descriptors, since that's only 2574 * correct for ATA, not ATAPI 2575 */ 2576 ata_gen_passthru_sense(qc); 2577 } else { 2578 u8 *scsicmd = cmd->cmnd; 2579 2580 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2581 unsigned long flags; 2582 u8 *buf; 2583 2584 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2585 2586 /* ATAPI devices typically report zero for their SCSI version, 2587 * and sometimes deviate from the spec WRT response data 2588 * format. If SCSI version is reported as zero like normal, 2589 * then we make the following fixups: 1) Fake MMC-5 version, 2590 * to indicate to the Linux scsi midlayer this is a modern 2591 * device. 2) Ensure response data format / ATAPI information 2592 * are always correct. 2593 */ 2594 if (buf[2] == 0) { 2595 buf[2] = 0x5; 2596 buf[3] = 0x32; 2597 } 2598 2599 ata_scsi_rbuf_put(cmd, true, &flags); 2600 } 2601 2602 cmd->result = SAM_STAT_GOOD; 2603 } 2604 2605 qc->scsidone(cmd); 2606 ata_qc_free(qc); 2607 } 2608 /** 2609 * atapi_xlat - Initialize PACKET taskfile 2610 * @qc: command structure to be initialized 2611 * 2612 * LOCKING: 2613 * spin_lock_irqsave(host lock) 2614 * 2615 * RETURNS: 2616 * Zero on success, non-zero on failure. 2617 */ 2618 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2619 { 2620 struct scsi_cmnd *scmd = qc->scsicmd; 2621 struct ata_device *dev = qc->dev; 2622 int nodata = (scmd->sc_data_direction == DMA_NONE); 2623 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2624 unsigned int nbytes; 2625 2626 memset(qc->cdb, 0, dev->cdb_len); 2627 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2628 2629 qc->complete_fn = atapi_qc_complete; 2630 2631 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2632 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2633 qc->tf.flags |= ATA_TFLAG_WRITE; 2634 DPRINTK("direction: write\n"); 2635 } 2636 2637 qc->tf.command = ATA_CMD_PACKET; 2638 ata_qc_set_pc_nbytes(qc); 2639 2640 /* check whether ATAPI DMA is safe */ 2641 if (!nodata && !using_pio && atapi_check_dma(qc)) 2642 using_pio = 1; 2643 2644 /* Some controller variants snoop this value for Packet 2645 * transfers to do state machine and FIFO management. Thus we 2646 * want to set it properly, and for DMA where it is 2647 * effectively meaningless. 2648 */ 2649 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2650 2651 /* Most ATAPI devices which honor transfer chunk size don't 2652 * behave according to the spec when odd chunk size which 2653 * matches the transfer length is specified. If the number of 2654 * bytes to transfer is 2n+1. According to the spec, what 2655 * should happen is to indicate that 2n+1 is going to be 2656 * transferred and transfer 2n+2 bytes where the last byte is 2657 * padding. 2658 * 2659 * In practice, this doesn't happen. ATAPI devices first 2660 * indicate and transfer 2n bytes and then indicate and 2661 * transfer 2 bytes where the last byte is padding. 2662 * 2663 * This inconsistency confuses several controllers which 2664 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2665 * These controllers use actual number of transferred bytes to 2666 * update DMA poitner and transfer of 4n+2 bytes make those 2667 * controller push DMA pointer by 4n+4 bytes because SATA data 2668 * FISes are aligned to 4 bytes. This causes data corruption 2669 * and buffer overrun. 2670 * 2671 * Always setting nbytes to even number solves this problem 2672 * because then ATAPI devices don't have to split data at 2n 2673 * boundaries. 2674 */ 2675 if (nbytes & 0x1) 2676 nbytes++; 2677 2678 qc->tf.lbam = (nbytes & 0xFF); 2679 qc->tf.lbah = (nbytes >> 8); 2680 2681 if (nodata) 2682 qc->tf.protocol = ATAPI_PROT_NODATA; 2683 else if (using_pio) 2684 qc->tf.protocol = ATAPI_PROT_PIO; 2685 else { 2686 /* DMA data xfer */ 2687 qc->tf.protocol = ATAPI_PROT_DMA; 2688 qc->tf.feature |= ATAPI_PKT_DMA; 2689 2690 if ((dev->flags & ATA_DFLAG_DMADIR) && 2691 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2692 /* some SATA bridges need us to indicate data xfer direction */ 2693 qc->tf.feature |= ATAPI_DMADIR; 2694 } 2695 2696 2697 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2698 as ATAPI tape drives don't get this right otherwise */ 2699 return 0; 2700 } 2701 2702 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2703 { 2704 if (!sata_pmp_attached(ap)) { 2705 if (likely(devno < ata_link_max_devices(&ap->link))) 2706 return &ap->link.device[devno]; 2707 } else { 2708 if (likely(devno < ap->nr_pmp_links)) 2709 return &ap->pmp_link[devno].device[0]; 2710 } 2711 2712 return NULL; 2713 } 2714 2715 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2716 const struct scsi_device *scsidev) 2717 { 2718 int devno; 2719 2720 /* skip commands not addressed to targets we simulate */ 2721 if (!sata_pmp_attached(ap)) { 2722 if (unlikely(scsidev->channel || scsidev->lun)) 2723 return NULL; 2724 devno = scsidev->id; 2725 } else { 2726 if (unlikely(scsidev->id || scsidev->lun)) 2727 return NULL; 2728 devno = scsidev->channel; 2729 } 2730 2731 return ata_find_dev(ap, devno); 2732 } 2733 2734 /** 2735 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2736 * @ap: ATA port to which the device is attached 2737 * @scsidev: SCSI device from which we derive the ATA device 2738 * 2739 * Given various information provided in struct scsi_cmnd, 2740 * map that onto an ATA bus, and using that mapping 2741 * determine which ata_device is associated with the 2742 * SCSI command to be sent. 2743 * 2744 * LOCKING: 2745 * spin_lock_irqsave(host lock) 2746 * 2747 * RETURNS: 2748 * Associated ATA device, or %NULL if not found. 2749 */ 2750 static struct ata_device * 2751 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2752 { 2753 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2754 2755 if (unlikely(!dev || !ata_dev_enabled(dev))) 2756 return NULL; 2757 2758 return dev; 2759 } 2760 2761 /* 2762 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2763 * @byte1: Byte 1 from pass-thru CDB. 2764 * 2765 * RETURNS: 2766 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2767 */ 2768 static u8 2769 ata_scsi_map_proto(u8 byte1) 2770 { 2771 switch((byte1 & 0x1e) >> 1) { 2772 case 3: /* Non-data */ 2773 return ATA_PROT_NODATA; 2774 2775 case 6: /* DMA */ 2776 case 10: /* UDMA Data-in */ 2777 case 11: /* UDMA Data-Out */ 2778 return ATA_PROT_DMA; 2779 2780 case 4: /* PIO Data-in */ 2781 case 5: /* PIO Data-out */ 2782 return ATA_PROT_PIO; 2783 2784 case 0: /* Hard Reset */ 2785 case 1: /* SRST */ 2786 case 8: /* Device Diagnostic */ 2787 case 9: /* Device Reset */ 2788 case 7: /* DMA Queued */ 2789 case 12: /* FPDMA */ 2790 case 15: /* Return Response Info */ 2791 default: /* Reserved */ 2792 break; 2793 } 2794 2795 return ATA_PROT_UNKNOWN; 2796 } 2797 2798 /** 2799 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2800 * @qc: command structure to be initialized 2801 * 2802 * Handles either 12 or 16-byte versions of the CDB. 2803 * 2804 * RETURNS: 2805 * Zero on success, non-zero on failure. 2806 */ 2807 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2808 { 2809 struct ata_taskfile *tf = &(qc->tf); 2810 struct scsi_cmnd *scmd = qc->scsicmd; 2811 struct ata_device *dev = qc->dev; 2812 const u8 *cdb = scmd->cmnd; 2813 2814 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2815 goto invalid_fld; 2816 2817 /* 2818 * Filter TPM commands by default. These provide an 2819 * essentially uncontrolled encrypted "back door" between 2820 * applications and the disk. Set libata.allow_tpm=1 if you 2821 * have a real reason for wanting to use them. This ensures 2822 * that installed software cannot easily mess stuff up without 2823 * user intent. DVR type users will probably ship with this enabled 2824 * for movie content management. 2825 * 2826 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2827 * for this and should do in future but that it is not sufficient as 2828 * DCS is an optional feature set. Thus we also do the software filter 2829 * so that we comply with the TC consortium stated goal that the user 2830 * can turn off TC features of their system. 2831 */ 2832 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2833 goto invalid_fld; 2834 2835 /* We may not issue DMA commands if no DMA mode is set */ 2836 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2837 goto invalid_fld; 2838 2839 /* 2840 * 12 and 16 byte CDBs use different offsets to 2841 * provide the various register values. 2842 */ 2843 if (cdb[0] == ATA_16) { 2844 /* 2845 * 16-byte CDB - may contain extended commands. 2846 * 2847 * If that is the case, copy the upper byte register values. 2848 */ 2849 if (cdb[1] & 0x01) { 2850 tf->hob_feature = cdb[3]; 2851 tf->hob_nsect = cdb[5]; 2852 tf->hob_lbal = cdb[7]; 2853 tf->hob_lbam = cdb[9]; 2854 tf->hob_lbah = cdb[11]; 2855 tf->flags |= ATA_TFLAG_LBA48; 2856 } else 2857 tf->flags &= ~ATA_TFLAG_LBA48; 2858 2859 /* 2860 * Always copy low byte, device and command registers. 2861 */ 2862 tf->feature = cdb[4]; 2863 tf->nsect = cdb[6]; 2864 tf->lbal = cdb[8]; 2865 tf->lbam = cdb[10]; 2866 tf->lbah = cdb[12]; 2867 tf->device = cdb[13]; 2868 tf->command = cdb[14]; 2869 } else { 2870 /* 2871 * 12-byte CDB - incapable of extended commands. 2872 */ 2873 tf->flags &= ~ATA_TFLAG_LBA48; 2874 2875 tf->feature = cdb[3]; 2876 tf->nsect = cdb[4]; 2877 tf->lbal = cdb[5]; 2878 tf->lbam = cdb[6]; 2879 tf->lbah = cdb[7]; 2880 tf->device = cdb[8]; 2881 tf->command = cdb[9]; 2882 } 2883 2884 /* enforce correct master/slave bit */ 2885 tf->device = dev->devno ? 2886 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2887 2888 /* sanity check for pio multi commands */ 2889 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2890 goto invalid_fld; 2891 2892 if (is_multi_taskfile(tf)) { 2893 unsigned int multi_count = 1 << (cdb[1] >> 5); 2894 2895 /* compare the passed through multi_count 2896 * with the cached multi_count of libata 2897 */ 2898 if (multi_count != dev->multi_count) 2899 ata_dev_printk(dev, KERN_WARNING, 2900 "invalid multi_count %u ignored\n", 2901 multi_count); 2902 } 2903 2904 /* READ/WRITE LONG use a non-standard sect_size */ 2905 qc->sect_size = ATA_SECT_SIZE; 2906 switch (tf->command) { 2907 case ATA_CMD_READ_LONG: 2908 case ATA_CMD_READ_LONG_ONCE: 2909 case ATA_CMD_WRITE_LONG: 2910 case ATA_CMD_WRITE_LONG_ONCE: 2911 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2912 goto invalid_fld; 2913 qc->sect_size = scsi_bufflen(scmd); 2914 } 2915 2916 /* 2917 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2918 * SET_FEATURES - XFER MODE must be preceded/succeeded 2919 * by an update to hardware-specific registers for each 2920 * controller (i.e. the reason for ->set_piomode(), 2921 * ->set_dmamode(), and ->post_set_mode() hooks). 2922 */ 2923 if ((tf->command == ATA_CMD_SET_FEATURES) 2924 && (tf->feature == SETFEATURES_XFER)) 2925 goto invalid_fld; 2926 2927 /* 2928 * Set flags so that all registers will be written, 2929 * and pass on write indication (used for PIO/DMA 2930 * setup.) 2931 */ 2932 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2933 2934 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2935 tf->flags |= ATA_TFLAG_WRITE; 2936 2937 /* 2938 * Set transfer length. 2939 * 2940 * TODO: find out if we need to do more here to 2941 * cover scatter/gather case. 2942 */ 2943 ata_qc_set_pc_nbytes(qc); 2944 2945 /* request result TF and be quiet about device error */ 2946 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2947 2948 return 0; 2949 2950 invalid_fld: 2951 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2952 /* "Invalid field in cdb" */ 2953 return 1; 2954 } 2955 2956 /** 2957 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2958 * @dev: ATA device 2959 * @cmd: SCSI command opcode to consider 2960 * 2961 * Look up the SCSI command given, and determine whether the 2962 * SCSI command is to be translated or simulated. 2963 * 2964 * RETURNS: 2965 * Pointer to translation function if possible, %NULL if not. 2966 */ 2967 2968 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2969 { 2970 switch (cmd) { 2971 case READ_6: 2972 case READ_10: 2973 case READ_16: 2974 2975 case WRITE_6: 2976 case WRITE_10: 2977 case WRITE_16: 2978 return ata_scsi_rw_xlat; 2979 2980 case SYNCHRONIZE_CACHE: 2981 if (ata_try_flush_cache(dev)) 2982 return ata_scsi_flush_xlat; 2983 break; 2984 2985 case VERIFY: 2986 case VERIFY_16: 2987 return ata_scsi_verify_xlat; 2988 2989 case ATA_12: 2990 case ATA_16: 2991 return ata_scsi_pass_thru; 2992 2993 case START_STOP: 2994 return ata_scsi_start_stop_xlat; 2995 } 2996 2997 return NULL; 2998 } 2999 3000 /** 3001 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3002 * @ap: ATA port to which the command was being sent 3003 * @cmd: SCSI command to dump 3004 * 3005 * Prints the contents of a SCSI command via printk(). 3006 */ 3007 3008 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3009 struct scsi_cmnd *cmd) 3010 { 3011 #ifdef ATA_DEBUG 3012 struct scsi_device *scsidev = cmd->device; 3013 u8 *scsicmd = cmd->cmnd; 3014 3015 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3016 ap->print_id, 3017 scsidev->channel, scsidev->id, scsidev->lun, 3018 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3019 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3020 scsicmd[8]); 3021 #endif 3022 } 3023 3024 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3025 void (*done)(struct scsi_cmnd *), 3026 struct ata_device *dev) 3027 { 3028 u8 scsi_op = scmd->cmnd[0]; 3029 ata_xlat_func_t xlat_func; 3030 int rc = 0; 3031 3032 if (dev->class == ATA_DEV_ATA) { 3033 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3034 goto bad_cdb_len; 3035 3036 xlat_func = ata_get_xlat_func(dev, scsi_op); 3037 } else { 3038 if (unlikely(!scmd->cmd_len)) 3039 goto bad_cdb_len; 3040 3041 xlat_func = NULL; 3042 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3043 /* relay SCSI command to ATAPI device */ 3044 int len = COMMAND_SIZE(scsi_op); 3045 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3046 goto bad_cdb_len; 3047 3048 xlat_func = atapi_xlat; 3049 } else { 3050 /* ATA_16 passthru, treat as an ATA command */ 3051 if (unlikely(scmd->cmd_len > 16)) 3052 goto bad_cdb_len; 3053 3054 xlat_func = ata_get_xlat_func(dev, scsi_op); 3055 } 3056 } 3057 3058 if (xlat_func) 3059 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3060 else 3061 ata_scsi_simulate(dev, scmd, done); 3062 3063 return rc; 3064 3065 bad_cdb_len: 3066 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3067 scmd->cmd_len, scsi_op, dev->cdb_len); 3068 scmd->result = DID_ERROR << 16; 3069 done(scmd); 3070 return 0; 3071 } 3072 3073 /** 3074 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3075 * @cmd: SCSI command to be sent 3076 * @done: Completion function, called when command is complete 3077 * 3078 * In some cases, this function translates SCSI commands into 3079 * ATA taskfiles, and queues the taskfiles to be sent to 3080 * hardware. In other cases, this function simulates a 3081 * SCSI device by evaluating and responding to certain 3082 * SCSI commands. This creates the overall effect of 3083 * ATA and ATAPI devices appearing as SCSI devices. 3084 * 3085 * LOCKING: 3086 * Releases scsi-layer-held lock, and obtains host lock. 3087 * 3088 * RETURNS: 3089 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3090 * 0 otherwise. 3091 */ 3092 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3093 { 3094 struct ata_port *ap; 3095 struct ata_device *dev; 3096 struct scsi_device *scsidev = cmd->device; 3097 struct Scsi_Host *shost = scsidev->host; 3098 int rc = 0; 3099 3100 ap = ata_shost_to_port(shost); 3101 3102 spin_unlock(shost->host_lock); 3103 spin_lock(ap->lock); 3104 3105 ata_scsi_dump_cdb(ap, cmd); 3106 3107 dev = ata_scsi_find_dev(ap, scsidev); 3108 if (likely(dev)) 3109 rc = __ata_scsi_queuecmd(cmd, done, dev); 3110 else { 3111 cmd->result = (DID_BAD_TARGET << 16); 3112 done(cmd); 3113 } 3114 3115 spin_unlock(ap->lock); 3116 spin_lock(shost->host_lock); 3117 return rc; 3118 } 3119 3120 /** 3121 * ata_scsi_simulate - simulate SCSI command on ATA device 3122 * @dev: the target device 3123 * @cmd: SCSI command being sent to device. 3124 * @done: SCSI command completion function. 3125 * 3126 * Interprets and directly executes a select list of SCSI commands 3127 * that can be handled internally. 3128 * 3129 * LOCKING: 3130 * spin_lock_irqsave(host lock) 3131 */ 3132 3133 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3134 void (*done)(struct scsi_cmnd *)) 3135 { 3136 struct ata_scsi_args args; 3137 const u8 *scsicmd = cmd->cmnd; 3138 u8 tmp8; 3139 3140 args.dev = dev; 3141 args.id = dev->id; 3142 args.cmd = cmd; 3143 args.done = done; 3144 3145 switch(scsicmd[0]) { 3146 /* TODO: worth improving? */ 3147 case FORMAT_UNIT: 3148 ata_scsi_invalid_field(cmd, done); 3149 break; 3150 3151 case INQUIRY: 3152 if (scsicmd[1] & 2) /* is CmdDt set? */ 3153 ata_scsi_invalid_field(cmd, done); 3154 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3155 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3156 else switch (scsicmd[2]) { 3157 case 0x00: 3158 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3159 break; 3160 case 0x80: 3161 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3162 break; 3163 case 0x83: 3164 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3165 break; 3166 case 0x89: 3167 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3168 break; 3169 case 0xb1: 3170 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3171 break; 3172 default: 3173 ata_scsi_invalid_field(cmd, done); 3174 break; 3175 } 3176 break; 3177 3178 case MODE_SENSE: 3179 case MODE_SENSE_10: 3180 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3181 break; 3182 3183 case MODE_SELECT: /* unconditionally return */ 3184 case MODE_SELECT_10: /* bad-field-in-cdb */ 3185 ata_scsi_invalid_field(cmd, done); 3186 break; 3187 3188 case READ_CAPACITY: 3189 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3190 break; 3191 3192 case SERVICE_ACTION_IN: 3193 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3194 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3195 else 3196 ata_scsi_invalid_field(cmd, done); 3197 break; 3198 3199 case REPORT_LUNS: 3200 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3201 break; 3202 3203 case REQUEST_SENSE: 3204 ata_scsi_set_sense(cmd, 0, 0, 0); 3205 cmd->result = (DRIVER_SENSE << 24); 3206 done(cmd); 3207 break; 3208 3209 /* if we reach this, then writeback caching is disabled, 3210 * turning this into a no-op. 3211 */ 3212 case SYNCHRONIZE_CACHE: 3213 /* fall through */ 3214 3215 /* no-op's, complete with success */ 3216 case REZERO_UNIT: 3217 case SEEK_6: 3218 case SEEK_10: 3219 case TEST_UNIT_READY: 3220 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3221 break; 3222 3223 case SEND_DIAGNOSTIC: 3224 tmp8 = scsicmd[1] & ~(1 << 3); 3225 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3226 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3227 else 3228 ata_scsi_invalid_field(cmd, done); 3229 break; 3230 3231 /* all other commands */ 3232 default: 3233 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3234 /* "Invalid command operation code" */ 3235 done(cmd); 3236 break; 3237 } 3238 } 3239 3240 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3241 { 3242 int i, rc; 3243 3244 for (i = 0; i < host->n_ports; i++) { 3245 struct ata_port *ap = host->ports[i]; 3246 struct Scsi_Host *shost; 3247 3248 rc = -ENOMEM; 3249 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3250 if (!shost) 3251 goto err_alloc; 3252 3253 *(struct ata_port **)&shost->hostdata[0] = ap; 3254 ap->scsi_host = shost; 3255 3256 shost->transportt = &ata_scsi_transport_template; 3257 shost->unique_id = ap->print_id; 3258 shost->max_id = 16; 3259 shost->max_lun = 1; 3260 shost->max_channel = 1; 3261 shost->max_cmd_len = 16; 3262 3263 /* Schedule policy is determined by ->qc_defer() 3264 * callback and it needs to see every deferred qc. 3265 * Set host_blocked to 1 to prevent SCSI midlayer from 3266 * automatically deferring requests. 3267 */ 3268 shost->max_host_blocked = 1; 3269 3270 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3271 if (rc) 3272 goto err_add; 3273 } 3274 3275 return 0; 3276 3277 err_add: 3278 scsi_host_put(host->ports[i]->scsi_host); 3279 err_alloc: 3280 while (--i >= 0) { 3281 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3282 3283 scsi_remove_host(shost); 3284 scsi_host_put(shost); 3285 } 3286 return rc; 3287 } 3288 3289 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3290 { 3291 int tries = 5; 3292 struct ata_device *last_failed_dev = NULL; 3293 struct ata_link *link; 3294 struct ata_device *dev; 3295 3296 if (ap->flags & ATA_FLAG_DISABLED) 3297 return; 3298 3299 repeat: 3300 ata_for_each_link(link, ap, EDGE) { 3301 ata_for_each_dev(dev, link, ENABLED) { 3302 struct scsi_device *sdev; 3303 int channel = 0, id = 0; 3304 3305 if (dev->sdev) 3306 continue; 3307 3308 if (ata_is_host_link(link)) 3309 id = dev->devno; 3310 else 3311 channel = link->pmp; 3312 3313 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3314 NULL); 3315 if (!IS_ERR(sdev)) { 3316 dev->sdev = sdev; 3317 scsi_device_put(sdev); 3318 } 3319 } 3320 } 3321 3322 /* If we scanned while EH was in progress or allocation 3323 * failure occurred, scan would have failed silently. Check 3324 * whether all devices are attached. 3325 */ 3326 ata_for_each_link(link, ap, EDGE) { 3327 ata_for_each_dev(dev, link, ENABLED) { 3328 if (!dev->sdev) 3329 goto exit_loop; 3330 } 3331 } 3332 exit_loop: 3333 if (!link) 3334 return; 3335 3336 /* we're missing some SCSI devices */ 3337 if (sync) { 3338 /* If caller requested synchrnous scan && we've made 3339 * any progress, sleep briefly and repeat. 3340 */ 3341 if (dev != last_failed_dev) { 3342 msleep(100); 3343 last_failed_dev = dev; 3344 goto repeat; 3345 } 3346 3347 /* We might be failing to detect boot device, give it 3348 * a few more chances. 3349 */ 3350 if (--tries) { 3351 msleep(100); 3352 goto repeat; 3353 } 3354 3355 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3356 "failed without making any progress,\n" 3357 " switching to async\n"); 3358 } 3359 3360 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3361 round_jiffies_relative(HZ)); 3362 } 3363 3364 /** 3365 * ata_scsi_offline_dev - offline attached SCSI device 3366 * @dev: ATA device to offline attached SCSI device for 3367 * 3368 * This function is called from ata_eh_hotplug() and responsible 3369 * for taking the SCSI device attached to @dev offline. This 3370 * function is called with host lock which protects dev->sdev 3371 * against clearing. 3372 * 3373 * LOCKING: 3374 * spin_lock_irqsave(host lock) 3375 * 3376 * RETURNS: 3377 * 1 if attached SCSI device exists, 0 otherwise. 3378 */ 3379 int ata_scsi_offline_dev(struct ata_device *dev) 3380 { 3381 if (dev->sdev) { 3382 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3383 return 1; 3384 } 3385 return 0; 3386 } 3387 3388 /** 3389 * ata_scsi_remove_dev - remove attached SCSI device 3390 * @dev: ATA device to remove attached SCSI device for 3391 * 3392 * This function is called from ata_eh_scsi_hotplug() and 3393 * responsible for removing the SCSI device attached to @dev. 3394 * 3395 * LOCKING: 3396 * Kernel thread context (may sleep). 3397 */ 3398 static void ata_scsi_remove_dev(struct ata_device *dev) 3399 { 3400 struct ata_port *ap = dev->link->ap; 3401 struct scsi_device *sdev; 3402 unsigned long flags; 3403 3404 /* Alas, we need to grab scan_mutex to ensure SCSI device 3405 * state doesn't change underneath us and thus 3406 * scsi_device_get() always succeeds. The mutex locking can 3407 * be removed if there is __scsi_device_get() interface which 3408 * increments reference counts regardless of device state. 3409 */ 3410 mutex_lock(&ap->scsi_host->scan_mutex); 3411 spin_lock_irqsave(ap->lock, flags); 3412 3413 /* clearing dev->sdev is protected by host lock */ 3414 sdev = dev->sdev; 3415 dev->sdev = NULL; 3416 3417 if (sdev) { 3418 /* If user initiated unplug races with us, sdev can go 3419 * away underneath us after the host lock and 3420 * scan_mutex are released. Hold onto it. 3421 */ 3422 if (scsi_device_get(sdev) == 0) { 3423 /* The following ensures the attached sdev is 3424 * offline on return from ata_scsi_offline_dev() 3425 * regardless it wins or loses the race 3426 * against this function. 3427 */ 3428 scsi_device_set_state(sdev, SDEV_OFFLINE); 3429 } else { 3430 WARN_ON(1); 3431 sdev = NULL; 3432 } 3433 } 3434 3435 spin_unlock_irqrestore(ap->lock, flags); 3436 mutex_unlock(&ap->scsi_host->scan_mutex); 3437 3438 if (sdev) { 3439 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3440 dev_name(&sdev->sdev_gendev)); 3441 3442 scsi_remove_device(sdev); 3443 scsi_device_put(sdev); 3444 } 3445 } 3446 3447 static void ata_scsi_handle_link_detach(struct ata_link *link) 3448 { 3449 struct ata_port *ap = link->ap; 3450 struct ata_device *dev; 3451 3452 ata_for_each_dev(dev, link, ALL) { 3453 unsigned long flags; 3454 3455 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3456 continue; 3457 3458 spin_lock_irqsave(ap->lock, flags); 3459 dev->flags &= ~ATA_DFLAG_DETACHED; 3460 spin_unlock_irqrestore(ap->lock, flags); 3461 3462 ata_scsi_remove_dev(dev); 3463 } 3464 } 3465 3466 /** 3467 * ata_scsi_media_change_notify - send media change event 3468 * @dev: Pointer to the disk device with media change event 3469 * 3470 * Tell the block layer to send a media change notification 3471 * event. 3472 * 3473 * LOCKING: 3474 * spin_lock_irqsave(host lock) 3475 */ 3476 void ata_scsi_media_change_notify(struct ata_device *dev) 3477 { 3478 if (dev->sdev) 3479 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3480 GFP_ATOMIC); 3481 } 3482 3483 /** 3484 * ata_scsi_hotplug - SCSI part of hotplug 3485 * @work: Pointer to ATA port to perform SCSI hotplug on 3486 * 3487 * Perform SCSI part of hotplug. It's executed from a separate 3488 * workqueue after EH completes. This is necessary because SCSI 3489 * hot plugging requires working EH and hot unplugging is 3490 * synchronized with hot plugging with a mutex. 3491 * 3492 * LOCKING: 3493 * Kernel thread context (may sleep). 3494 */ 3495 void ata_scsi_hotplug(struct work_struct *work) 3496 { 3497 struct ata_port *ap = 3498 container_of(work, struct ata_port, hotplug_task.work); 3499 int i; 3500 3501 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3502 DPRINTK("ENTER/EXIT - unloading\n"); 3503 return; 3504 } 3505 3506 DPRINTK("ENTER\n"); 3507 3508 /* Unplug detached devices. We cannot use link iterator here 3509 * because PMP links have to be scanned even if PMP is 3510 * currently not attached. Iterate manually. 3511 */ 3512 ata_scsi_handle_link_detach(&ap->link); 3513 if (ap->pmp_link) 3514 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3515 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3516 3517 /* scan for new ones */ 3518 ata_scsi_scan_host(ap, 0); 3519 3520 DPRINTK("EXIT\n"); 3521 } 3522 3523 /** 3524 * ata_scsi_user_scan - indication for user-initiated bus scan 3525 * @shost: SCSI host to scan 3526 * @channel: Channel to scan 3527 * @id: ID to scan 3528 * @lun: LUN to scan 3529 * 3530 * This function is called when user explicitly requests bus 3531 * scan. Set probe pending flag and invoke EH. 3532 * 3533 * LOCKING: 3534 * SCSI layer (we don't care) 3535 * 3536 * RETURNS: 3537 * Zero. 3538 */ 3539 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3540 unsigned int id, unsigned int lun) 3541 { 3542 struct ata_port *ap = ata_shost_to_port(shost); 3543 unsigned long flags; 3544 int devno, rc = 0; 3545 3546 if (!ap->ops->error_handler) 3547 return -EOPNOTSUPP; 3548 3549 if (lun != SCAN_WILD_CARD && lun) 3550 return -EINVAL; 3551 3552 if (!sata_pmp_attached(ap)) { 3553 if (channel != SCAN_WILD_CARD && channel) 3554 return -EINVAL; 3555 devno = id; 3556 } else { 3557 if (id != SCAN_WILD_CARD && id) 3558 return -EINVAL; 3559 devno = channel; 3560 } 3561 3562 spin_lock_irqsave(ap->lock, flags); 3563 3564 if (devno == SCAN_WILD_CARD) { 3565 struct ata_link *link; 3566 3567 ata_for_each_link(link, ap, EDGE) { 3568 struct ata_eh_info *ehi = &link->eh_info; 3569 ehi->probe_mask |= ATA_ALL_DEVICES; 3570 ehi->action |= ATA_EH_RESET; 3571 } 3572 } else { 3573 struct ata_device *dev = ata_find_dev(ap, devno); 3574 3575 if (dev) { 3576 struct ata_eh_info *ehi = &dev->link->eh_info; 3577 ehi->probe_mask |= 1 << dev->devno; 3578 ehi->action |= ATA_EH_RESET; 3579 } else 3580 rc = -EINVAL; 3581 } 3582 3583 if (rc == 0) { 3584 ata_port_schedule_eh(ap); 3585 spin_unlock_irqrestore(ap->lock, flags); 3586 ata_port_wait_eh(ap); 3587 } else 3588 spin_unlock_irqrestore(ap->lock, flags); 3589 3590 return rc; 3591 } 3592 3593 /** 3594 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3595 * @work: Pointer to ATA port to perform scsi_rescan_device() 3596 * 3597 * After ATA pass thru (SAT) commands are executed successfully, 3598 * libata need to propagate the changes to SCSI layer. This 3599 * function must be executed from ata_aux_wq such that sdev 3600 * attach/detach don't race with rescan. 3601 * 3602 * LOCKING: 3603 * Kernel thread context (may sleep). 3604 */ 3605 void ata_scsi_dev_rescan(struct work_struct *work) 3606 { 3607 struct ata_port *ap = 3608 container_of(work, struct ata_port, scsi_rescan_task); 3609 struct ata_link *link; 3610 struct ata_device *dev; 3611 unsigned long flags; 3612 3613 spin_lock_irqsave(ap->lock, flags); 3614 3615 ata_for_each_link(link, ap, EDGE) { 3616 ata_for_each_dev(dev, link, ENABLED) { 3617 struct scsi_device *sdev = dev->sdev; 3618 3619 if (!sdev) 3620 continue; 3621 if (scsi_device_get(sdev)) 3622 continue; 3623 3624 spin_unlock_irqrestore(ap->lock, flags); 3625 scsi_rescan_device(&(sdev->sdev_gendev)); 3626 scsi_device_put(sdev); 3627 spin_lock_irqsave(ap->lock, flags); 3628 } 3629 } 3630 3631 spin_unlock_irqrestore(ap->lock, flags); 3632 } 3633 3634 /** 3635 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3636 * @host: ATA host container for all SAS ports 3637 * @port_info: Information from low-level host driver 3638 * @shost: SCSI host that the scsi device is attached to 3639 * 3640 * LOCKING: 3641 * PCI/etc. bus probe sem. 3642 * 3643 * RETURNS: 3644 * ata_port pointer on success / NULL on failure. 3645 */ 3646 3647 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3648 struct ata_port_info *port_info, 3649 struct Scsi_Host *shost) 3650 { 3651 struct ata_port *ap; 3652 3653 ap = ata_port_alloc(host); 3654 if (!ap) 3655 return NULL; 3656 3657 ap->port_no = 0; 3658 ap->lock = shost->host_lock; 3659 ap->pio_mask = port_info->pio_mask; 3660 ap->mwdma_mask = port_info->mwdma_mask; 3661 ap->udma_mask = port_info->udma_mask; 3662 ap->flags |= port_info->flags; 3663 ap->ops = port_info->port_ops; 3664 ap->cbl = ATA_CBL_SATA; 3665 3666 return ap; 3667 } 3668 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3669 3670 /** 3671 * ata_sas_port_start - Set port up for dma. 3672 * @ap: Port to initialize 3673 * 3674 * Called just after data structures for each port are 3675 * initialized. 3676 * 3677 * May be used as the port_start() entry in ata_port_operations. 3678 * 3679 * LOCKING: 3680 * Inherited from caller. 3681 */ 3682 int ata_sas_port_start(struct ata_port *ap) 3683 { 3684 return 0; 3685 } 3686 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3687 3688 /** 3689 * ata_port_stop - Undo ata_sas_port_start() 3690 * @ap: Port to shut down 3691 * 3692 * May be used as the port_stop() entry in ata_port_operations. 3693 * 3694 * LOCKING: 3695 * Inherited from caller. 3696 */ 3697 3698 void ata_sas_port_stop(struct ata_port *ap) 3699 { 3700 } 3701 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3702 3703 /** 3704 * ata_sas_port_init - Initialize a SATA device 3705 * @ap: SATA port to initialize 3706 * 3707 * LOCKING: 3708 * PCI/etc. bus probe sem. 3709 * 3710 * RETURNS: 3711 * Zero on success, non-zero on error. 3712 */ 3713 3714 int ata_sas_port_init(struct ata_port *ap) 3715 { 3716 int rc = ap->ops->port_start(ap); 3717 3718 if (!rc) { 3719 ap->print_id = ata_print_id++; 3720 rc = ata_bus_probe(ap); 3721 } 3722 3723 return rc; 3724 } 3725 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3726 3727 /** 3728 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3729 * @ap: SATA port to destroy 3730 * 3731 */ 3732 3733 void ata_sas_port_destroy(struct ata_port *ap) 3734 { 3735 if (ap->ops->port_stop) 3736 ap->ops->port_stop(ap); 3737 kfree(ap); 3738 } 3739 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3740 3741 /** 3742 * ata_sas_slave_configure - Default slave_config routine for libata devices 3743 * @sdev: SCSI device to configure 3744 * @ap: ATA port to which SCSI device is attached 3745 * 3746 * RETURNS: 3747 * Zero. 3748 */ 3749 3750 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3751 { 3752 ata_scsi_sdev_config(sdev); 3753 ata_scsi_dev_config(sdev, ap->link.device); 3754 return 0; 3755 } 3756 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3757 3758 /** 3759 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3760 * @cmd: SCSI command to be sent 3761 * @done: Completion function, called when command is complete 3762 * @ap: ATA port to which the command is being sent 3763 * 3764 * RETURNS: 3765 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3766 * 0 otherwise. 3767 */ 3768 3769 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3770 struct ata_port *ap) 3771 { 3772 int rc = 0; 3773 3774 ata_scsi_dump_cdb(ap, cmd); 3775 3776 if (likely(ata_dev_enabled(ap->link.device))) 3777 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3778 else { 3779 cmd->result = (DID_BAD_TARGET << 16); 3780 done(cmd); 3781 } 3782 return rc; 3783 } 3784 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3785