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