1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/blkdev.h> 38 #include <linux/spinlock.h> 39 #include <scsi/scsi.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_cmnd.h> 42 #include <scsi/scsi_eh.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_tcq.h> 45 #include <scsi/scsi_transport.h> 46 #include <linux/libata.h> 47 #include <linux/hdreg.h> 48 #include <linux/uaccess.h> 49 #include <linux/suspend.h> 50 51 #include "libata.h" 52 53 #define SECTOR_SIZE 512 54 #define ATA_SCSI_RBUF_SIZE 4096 55 56 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 57 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 58 59 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 60 61 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 62 const struct scsi_device *scsidev); 63 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 64 const struct scsi_device *scsidev); 65 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 66 unsigned int id, unsigned int lun); 67 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 /* 108 * libata transport template. libata doesn't do real transport stuff. 109 * It just needs the eh_timed_out hook. 110 */ 111 static struct scsi_transport_template ata_scsi_transport_template = { 112 .eh_strategy_handler = ata_scsi_error, 113 .eh_timed_out = ata_scsi_timed_out, 114 .user_scan = ata_scsi_user_scan, 115 }; 116 117 118 static const struct { 119 enum link_pm value; 120 const char *name; 121 } link_pm_policy[] = { 122 { NOT_AVAILABLE, "max_performance" }, 123 { MIN_POWER, "min_power" }, 124 { MAX_PERFORMANCE, "max_performance" }, 125 { MEDIUM_POWER, "medium_power" }, 126 }; 127 128 static const char *ata_scsi_lpm_get(enum link_pm policy) 129 { 130 int i; 131 132 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++) 133 if (link_pm_policy[i].value == policy) 134 return link_pm_policy[i].name; 135 136 return NULL; 137 } 138 139 static ssize_t ata_scsi_lpm_put(struct device *dev, 140 struct device_attribute *attr, 141 const char *buf, size_t count) 142 { 143 struct Scsi_Host *shost = class_to_shost(dev); 144 struct ata_port *ap = ata_shost_to_port(shost); 145 enum link_pm policy = 0; 146 int i; 147 148 /* 149 * we are skipping array location 0 on purpose - this 150 * is because a value of NOT_AVAILABLE is displayed 151 * to the user as max_performance, but when the user 152 * writes "max_performance", they actually want the 153 * value to match MAX_PERFORMANCE. 154 */ 155 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) { 156 const int len = strlen(link_pm_policy[i].name); 157 if (strncmp(link_pm_policy[i].name, buf, len) == 0 && 158 buf[len] == '\n') { 159 policy = link_pm_policy[i].value; 160 break; 161 } 162 } 163 if (!policy) 164 return -EINVAL; 165 166 ata_lpm_schedule(ap, policy); 167 return count; 168 } 169 170 static ssize_t 171 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf) 172 { 173 struct Scsi_Host *shost = class_to_shost(dev); 174 struct ata_port *ap = ata_shost_to_port(shost); 175 const char *policy = 176 ata_scsi_lpm_get(ap->pm_policy); 177 178 if (!policy) 179 return -EINVAL; 180 181 return snprintf(buf, 23, "%s\n", policy); 182 } 183 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 184 ata_scsi_lpm_show, ata_scsi_lpm_put); 185 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 186 187 static ssize_t ata_scsi_park_show(struct device *device, 188 struct device_attribute *attr, char *buf) 189 { 190 struct scsi_device *sdev = to_scsi_device(device); 191 struct ata_port *ap; 192 struct ata_link *link; 193 struct ata_device *dev; 194 unsigned long flags, now; 195 unsigned int uninitialized_var(msecs); 196 int rc = 0; 197 198 ap = ata_shost_to_port(sdev->host); 199 200 spin_lock_irqsave(ap->lock, flags); 201 dev = ata_scsi_find_dev(ap, sdev); 202 if (!dev) { 203 rc = -ENODEV; 204 goto unlock; 205 } 206 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 207 rc = -EOPNOTSUPP; 208 goto unlock; 209 } 210 211 link = dev->link; 212 now = jiffies; 213 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 214 link->eh_context.unloaded_mask & (1 << dev->devno) && 215 time_after(dev->unpark_deadline, now)) 216 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 217 else 218 msecs = 0; 219 220 unlock: 221 spin_unlock_irq(ap->lock); 222 223 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 224 } 225 226 static ssize_t ata_scsi_park_store(struct device *device, 227 struct device_attribute *attr, 228 const char *buf, size_t len) 229 { 230 struct scsi_device *sdev = to_scsi_device(device); 231 struct ata_port *ap; 232 struct ata_device *dev; 233 long int input; 234 unsigned long flags; 235 int rc; 236 237 rc = strict_strtol(buf, 10, &input); 238 if (rc || input < -2) 239 return -EINVAL; 240 if (input > ATA_TMOUT_MAX_PARK) { 241 rc = -EOVERFLOW; 242 input = ATA_TMOUT_MAX_PARK; 243 } 244 245 ap = ata_shost_to_port(sdev->host); 246 247 spin_lock_irqsave(ap->lock, flags); 248 dev = ata_scsi_find_dev(ap, sdev); 249 if (unlikely(!dev)) { 250 rc = -ENODEV; 251 goto unlock; 252 } 253 if (dev->class != ATA_DEV_ATA) { 254 rc = -EOPNOTSUPP; 255 goto unlock; 256 } 257 258 if (input >= 0) { 259 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 260 rc = -EOPNOTSUPP; 261 goto unlock; 262 } 263 264 dev->unpark_deadline = ata_deadline(jiffies, input); 265 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 266 ata_port_schedule_eh(ap); 267 complete(&ap->park_req_pending); 268 } else { 269 switch (input) { 270 case -1: 271 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 272 break; 273 case -2: 274 dev->flags |= ATA_DFLAG_NO_UNLOAD; 275 break; 276 } 277 } 278 unlock: 279 spin_unlock_irqrestore(ap->lock, flags); 280 281 return rc ? rc : len; 282 } 283 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 284 ata_scsi_park_show, ata_scsi_park_store); 285 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 286 287 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 288 { 289 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 290 291 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 292 } 293 294 static ssize_t 295 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 296 const char *buf, size_t count) 297 { 298 struct Scsi_Host *shost = class_to_shost(dev); 299 struct ata_port *ap = ata_shost_to_port(shost); 300 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 301 return ap->ops->em_store(ap, buf, count); 302 return -EINVAL; 303 } 304 305 static ssize_t 306 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 307 char *buf) 308 { 309 struct Scsi_Host *shost = class_to_shost(dev); 310 struct ata_port *ap = ata_shost_to_port(shost); 311 312 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 313 return ap->ops->em_show(ap, buf); 314 return -EINVAL; 315 } 316 DEVICE_ATTR(em_message, S_IRUGO | S_IWUGO, 317 ata_scsi_em_message_show, ata_scsi_em_message_store); 318 EXPORT_SYMBOL_GPL(dev_attr_em_message); 319 320 static ssize_t 321 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 322 char *buf) 323 { 324 struct Scsi_Host *shost = class_to_shost(dev); 325 struct ata_port *ap = ata_shost_to_port(shost); 326 327 return snprintf(buf, 23, "%d\n", ap->em_message_type); 328 } 329 DEVICE_ATTR(em_message_type, S_IRUGO, 330 ata_scsi_em_message_type_show, NULL); 331 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 332 333 static ssize_t 334 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 341 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY)) 342 return ap->ops->sw_activity_show(atadev, buf); 343 return -EINVAL; 344 } 345 346 static ssize_t 347 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 348 const char *buf, size_t count) 349 { 350 struct scsi_device *sdev = to_scsi_device(dev); 351 struct ata_port *ap = ata_shost_to_port(sdev->host); 352 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 353 enum sw_activity val; 354 int rc; 355 356 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 357 val = simple_strtoul(buf, NULL, 0); 358 switch (val) { 359 case OFF: case BLINK_ON: case BLINK_OFF: 360 rc = ap->ops->sw_activity_store(atadev, val); 361 if (!rc) 362 return count; 363 else 364 return rc; 365 } 366 } 367 return -EINVAL; 368 } 369 DEVICE_ATTR(sw_activity, S_IWUGO | S_IRUGO, ata_scsi_activity_show, 370 ata_scsi_activity_store); 371 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 372 373 struct device_attribute *ata_common_sdev_attrs[] = { 374 &dev_attr_unload_heads, 375 NULL 376 }; 377 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 378 379 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 380 void (*done)(struct scsi_cmnd *)) 381 { 382 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 383 /* "Invalid field in cbd" */ 384 done(cmd); 385 } 386 387 /** 388 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 389 * @sdev: SCSI device for which BIOS geometry is to be determined 390 * @bdev: block device associated with @sdev 391 * @capacity: capacity of SCSI device 392 * @geom: location to which geometry will be output 393 * 394 * Generic bios head/sector/cylinder calculator 395 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 396 * mapping. Some situations may arise where the disk is not 397 * bootable if this is not used. 398 * 399 * LOCKING: 400 * Defined by the SCSI layer. We don't really care. 401 * 402 * RETURNS: 403 * Zero. 404 */ 405 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 406 sector_t capacity, int geom[]) 407 { 408 geom[0] = 255; 409 geom[1] = 63; 410 sector_div(capacity, 255*63); 411 geom[2] = capacity; 412 413 return 0; 414 } 415 416 /** 417 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 418 * @ap: target port 419 * @sdev: SCSI device to get identify data for 420 * @arg: User buffer area for identify data 421 * 422 * LOCKING: 423 * Defined by the SCSI layer. We don't really care. 424 * 425 * RETURNS: 426 * Zero on success, negative errno on error. 427 */ 428 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 429 void __user *arg) 430 { 431 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 432 u16 __user *dst = arg; 433 char buf[40]; 434 435 if (!dev) 436 return -ENOMSG; 437 438 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 439 return -EFAULT; 440 441 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 442 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 443 return -EFAULT; 444 445 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 446 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 447 return -EFAULT; 448 449 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 450 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 451 return -EFAULT; 452 453 return 0; 454 } 455 456 /** 457 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 458 * @scsidev: Device to which we are issuing command 459 * @arg: User provided data for issuing command 460 * 461 * LOCKING: 462 * Defined by the SCSI layer. We don't really care. 463 * 464 * RETURNS: 465 * Zero on success, negative errno on error. 466 */ 467 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 468 { 469 int rc = 0; 470 u8 scsi_cmd[MAX_COMMAND_SIZE]; 471 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 472 int argsize = 0; 473 enum dma_data_direction data_dir; 474 int cmd_result; 475 476 if (arg == NULL) 477 return -EINVAL; 478 479 if (copy_from_user(args, arg, sizeof(args))) 480 return -EFAULT; 481 482 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 483 if (!sensebuf) 484 return -ENOMEM; 485 486 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 487 488 if (args[3]) { 489 argsize = SECTOR_SIZE * args[3]; 490 argbuf = kmalloc(argsize, GFP_KERNEL); 491 if (argbuf == NULL) { 492 rc = -ENOMEM; 493 goto error; 494 } 495 496 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 497 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 498 block count in sector count field */ 499 data_dir = DMA_FROM_DEVICE; 500 } else { 501 scsi_cmd[1] = (3 << 1); /* Non-data */ 502 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 503 data_dir = DMA_NONE; 504 } 505 506 scsi_cmd[0] = ATA_16; 507 508 scsi_cmd[4] = args[2]; 509 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 510 scsi_cmd[6] = args[3]; 511 scsi_cmd[8] = args[1]; 512 scsi_cmd[10] = 0x4f; 513 scsi_cmd[12] = 0xc2; 514 } else { 515 scsi_cmd[6] = args[1]; 516 } 517 scsi_cmd[14] = args[0]; 518 519 /* Good values for timeout and retries? Values below 520 from scsi_ioctl_send_command() for default case... */ 521 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 522 sensebuf, (10*HZ), 5, 0, NULL); 523 524 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 525 u8 *desc = sensebuf + 8; 526 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 527 528 /* If we set cc then ATA pass-through will cause a 529 * check condition even if no error. Filter that. */ 530 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 531 struct scsi_sense_hdr sshdr; 532 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 533 &sshdr); 534 if (sshdr.sense_key == 0 && 535 sshdr.asc == 0 && sshdr.ascq == 0) 536 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 537 } 538 539 /* Send userspace a few ATA registers (same as drivers/ide) */ 540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 541 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 542 args[0] = desc[13]; /* status */ 543 args[1] = desc[3]; /* error */ 544 args[2] = desc[5]; /* sector count (0:7) */ 545 if (copy_to_user(arg, args, sizeof(args))) 546 rc = -EFAULT; 547 } 548 } 549 550 551 if (cmd_result) { 552 rc = -EIO; 553 goto error; 554 } 555 556 if ((argbuf) 557 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 558 rc = -EFAULT; 559 error: 560 kfree(sensebuf); 561 kfree(argbuf); 562 return rc; 563 } 564 565 /** 566 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 567 * @scsidev: Device to which we are issuing command 568 * @arg: User provided data for issuing command 569 * 570 * LOCKING: 571 * Defined by the SCSI layer. We don't really care. 572 * 573 * RETURNS: 574 * Zero on success, negative errno on error. 575 */ 576 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 577 { 578 int rc = 0; 579 u8 scsi_cmd[MAX_COMMAND_SIZE]; 580 u8 args[7], *sensebuf = NULL; 581 int cmd_result; 582 583 if (arg == NULL) 584 return -EINVAL; 585 586 if (copy_from_user(args, arg, sizeof(args))) 587 return -EFAULT; 588 589 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 590 if (!sensebuf) 591 return -ENOMEM; 592 593 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 594 scsi_cmd[0] = ATA_16; 595 scsi_cmd[1] = (3 << 1); /* Non-data */ 596 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 597 scsi_cmd[4] = args[1]; 598 scsi_cmd[6] = args[2]; 599 scsi_cmd[8] = args[3]; 600 scsi_cmd[10] = args[4]; 601 scsi_cmd[12] = args[5]; 602 scsi_cmd[13] = args[6] & 0x4f; 603 scsi_cmd[14] = args[0]; 604 605 /* Good values for timeout and retries? Values below 606 from scsi_ioctl_send_command() for default case... */ 607 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 608 sensebuf, (10*HZ), 5, 0, NULL); 609 610 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 611 u8 *desc = sensebuf + 8; 612 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 613 614 /* If we set cc then ATA pass-through will cause a 615 * check condition even if no error. Filter that. */ 616 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 617 struct scsi_sense_hdr sshdr; 618 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 619 &sshdr); 620 if (sshdr.sense_key == 0 && 621 sshdr.asc == 0 && sshdr.ascq == 0) 622 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 623 } 624 625 /* Send userspace ATA registers */ 626 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 627 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 628 args[0] = desc[13]; /* status */ 629 args[1] = desc[3]; /* error */ 630 args[2] = desc[5]; /* sector count (0:7) */ 631 args[3] = desc[7]; /* lbal */ 632 args[4] = desc[9]; /* lbam */ 633 args[5] = desc[11]; /* lbah */ 634 args[6] = desc[12]; /* select */ 635 if (copy_to_user(arg, args, sizeof(args))) 636 rc = -EFAULT; 637 } 638 } 639 640 if (cmd_result) { 641 rc = -EIO; 642 goto error; 643 } 644 645 error: 646 kfree(sensebuf); 647 return rc; 648 } 649 650 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 651 int cmd, void __user *arg) 652 { 653 int val = -EINVAL, rc = -EINVAL; 654 655 switch (cmd) { 656 case ATA_IOC_GET_IO32: 657 val = 0; 658 if (copy_to_user(arg, &val, 1)) 659 return -EFAULT; 660 return 0; 661 662 case ATA_IOC_SET_IO32: 663 val = (unsigned long) arg; 664 if (val != 0) 665 return -EINVAL; 666 return 0; 667 668 case HDIO_GET_IDENTITY: 669 return ata_get_identity(ap, scsidev, arg); 670 671 case HDIO_DRIVE_CMD: 672 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 673 return -EACCES; 674 return ata_cmd_ioctl(scsidev, arg); 675 676 case HDIO_DRIVE_TASK: 677 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 678 return -EACCES; 679 return ata_task_ioctl(scsidev, arg); 680 681 default: 682 rc = -ENOTTY; 683 break; 684 } 685 686 return rc; 687 } 688 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 689 690 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 691 { 692 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 693 scsidev, cmd, arg); 694 } 695 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 696 697 /** 698 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 699 * @dev: ATA device to which the new command is attached 700 * @cmd: SCSI command that originated this ATA command 701 * @done: SCSI command completion function 702 * 703 * Obtain a reference to an unused ata_queued_cmd structure, 704 * which is the basic libata structure representing a single 705 * ATA command sent to the hardware. 706 * 707 * If a command was available, fill in the SCSI-specific 708 * portions of the structure with information on the 709 * current command. 710 * 711 * LOCKING: 712 * spin_lock_irqsave(host lock) 713 * 714 * RETURNS: 715 * Command allocated, or %NULL if none available. 716 */ 717 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 718 struct scsi_cmnd *cmd, 719 void (*done)(struct scsi_cmnd *)) 720 { 721 struct ata_queued_cmd *qc; 722 723 qc = ata_qc_new_init(dev); 724 if (qc) { 725 qc->scsicmd = cmd; 726 qc->scsidone = done; 727 728 qc->sg = scsi_sglist(cmd); 729 qc->n_elem = scsi_sg_count(cmd); 730 } else { 731 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 732 done(cmd); 733 } 734 735 return qc; 736 } 737 738 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 739 { 740 struct scsi_cmnd *scmd = qc->scsicmd; 741 742 qc->extrabytes = scmd->request->extra_len; 743 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 744 } 745 746 /** 747 * ata_dump_status - user friendly display of error info 748 * @id: id of the port in question 749 * @tf: ptr to filled out taskfile 750 * 751 * Decode and dump the ATA error/status registers for the user so 752 * that they have some idea what really happened at the non 753 * make-believe layer. 754 * 755 * LOCKING: 756 * inherited from caller 757 */ 758 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 759 { 760 u8 stat = tf->command, err = tf->feature; 761 762 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 763 if (stat & ATA_BUSY) { 764 printk("Busy }\n"); /* Data is not valid in this case */ 765 } else { 766 if (stat & 0x40) printk("DriveReady "); 767 if (stat & 0x20) printk("DeviceFault "); 768 if (stat & 0x10) printk("SeekComplete "); 769 if (stat & 0x08) printk("DataRequest "); 770 if (stat & 0x04) printk("CorrectedError "); 771 if (stat & 0x02) printk("Index "); 772 if (stat & 0x01) printk("Error "); 773 printk("}\n"); 774 775 if (err) { 776 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 777 if (err & 0x04) printk("DriveStatusError "); 778 if (err & 0x80) { 779 if (err & 0x04) printk("BadCRC "); 780 else printk("Sector "); 781 } 782 if (err & 0x40) printk("UncorrectableError "); 783 if (err & 0x10) printk("SectorIdNotFound "); 784 if (err & 0x02) printk("TrackZeroNotFound "); 785 if (err & 0x01) printk("AddrMarkNotFound "); 786 printk("}\n"); 787 } 788 } 789 } 790 791 /** 792 * ata_to_sense_error - convert ATA error to SCSI error 793 * @id: ATA device number 794 * @drv_stat: value contained in ATA status register 795 * @drv_err: value contained in ATA error register 796 * @sk: the sense key we'll fill out 797 * @asc: the additional sense code we'll fill out 798 * @ascq: the additional sense code qualifier we'll fill out 799 * @verbose: be verbose 800 * 801 * Converts an ATA error into a SCSI error. Fill out pointers to 802 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 803 * format sense blocks. 804 * 805 * LOCKING: 806 * spin_lock_irqsave(host lock) 807 */ 808 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 809 u8 *asc, u8 *ascq, int verbose) 810 { 811 int i; 812 813 /* Based on the 3ware driver translation table */ 814 static const unsigned char sense_table[][4] = { 815 /* BBD|ECC|ID|MAR */ 816 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 817 /* BBD|ECC|ID */ 818 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 819 /* ECC|MC|MARK */ 820 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 821 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 822 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 823 /* MC|ID|ABRT|TRK0|MARK */ 824 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 825 /* MCR|MARK */ 826 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 827 /* Bad address mark */ 828 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 829 /* TRK0 */ 830 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 831 /* Abort & !ICRC */ 832 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 833 /* Media change request */ 834 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 835 /* SRV */ 836 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 837 /* Media change */ 838 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 839 /* ECC */ 840 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 841 /* BBD - block marked bad */ 842 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 843 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 844 }; 845 static const unsigned char stat_table[][4] = { 846 /* Must be first because BUSY means no other bits valid */ 847 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 848 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 849 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 850 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 851 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 852 }; 853 854 /* 855 * Is this an error we can process/parse 856 */ 857 if (drv_stat & ATA_BUSY) { 858 drv_err = 0; /* Ignore the err bits, they're invalid */ 859 } 860 861 if (drv_err) { 862 /* Look for drv_err */ 863 for (i = 0; sense_table[i][0] != 0xFF; i++) { 864 /* Look for best matches first */ 865 if ((sense_table[i][0] & drv_err) == 866 sense_table[i][0]) { 867 *sk = sense_table[i][1]; 868 *asc = sense_table[i][2]; 869 *ascq = sense_table[i][3]; 870 goto translate_done; 871 } 872 } 873 /* No immediate match */ 874 if (verbose) 875 printk(KERN_WARNING "ata%u: no sense translation for " 876 "error 0x%02x\n", id, drv_err); 877 } 878 879 /* Fall back to interpreting status bits */ 880 for (i = 0; stat_table[i][0] != 0xFF; i++) { 881 if (stat_table[i][0] & drv_stat) { 882 *sk = stat_table[i][1]; 883 *asc = stat_table[i][2]; 884 *ascq = stat_table[i][3]; 885 goto translate_done; 886 } 887 } 888 /* No error? Undecoded? */ 889 if (verbose) 890 printk(KERN_WARNING "ata%u: no sense translation for " 891 "status: 0x%02x\n", id, drv_stat); 892 893 /* We need a sensible error return here, which is tricky, and one 894 that won't cause people to do things like return a disk wrongly */ 895 *sk = ABORTED_COMMAND; 896 *asc = 0x00; 897 *ascq = 0x00; 898 899 translate_done: 900 if (verbose) 901 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 902 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 903 id, drv_stat, drv_err, *sk, *asc, *ascq); 904 return; 905 } 906 907 /* 908 * ata_gen_passthru_sense - Generate check condition sense block. 909 * @qc: Command that completed. 910 * 911 * This function is specific to the ATA descriptor format sense 912 * block specified for the ATA pass through commands. Regardless 913 * of whether the command errored or not, return a sense 914 * block. Copy all controller registers into the sense 915 * block. Clear sense key, ASC & ASCQ if there is no error. 916 * 917 * LOCKING: 918 * None. 919 */ 920 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 921 { 922 struct scsi_cmnd *cmd = qc->scsicmd; 923 struct ata_taskfile *tf = &qc->result_tf; 924 unsigned char *sb = cmd->sense_buffer; 925 unsigned char *desc = sb + 8; 926 int verbose = qc->ap->ops->error_handler == NULL; 927 928 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 929 930 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 931 932 /* 933 * Use ata_to_sense_error() to map status register bits 934 * onto sense key, asc & ascq. 935 */ 936 if (qc->err_mask || 937 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 938 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 939 &sb[1], &sb[2], &sb[3], verbose); 940 sb[1] &= 0x0f; 941 } 942 943 /* 944 * Sense data is current and format is descriptor. 945 */ 946 sb[0] = 0x72; 947 948 desc[0] = 0x09; 949 950 /* set length of additional sense data */ 951 sb[7] = 14; 952 desc[1] = 12; 953 954 /* 955 * Copy registers into sense buffer. 956 */ 957 desc[2] = 0x00; 958 desc[3] = tf->feature; /* == error reg */ 959 desc[5] = tf->nsect; 960 desc[7] = tf->lbal; 961 desc[9] = tf->lbam; 962 desc[11] = tf->lbah; 963 desc[12] = tf->device; 964 desc[13] = tf->command; /* == status reg */ 965 966 /* 967 * Fill in Extend bit, and the high order bytes 968 * if applicable. 969 */ 970 if (tf->flags & ATA_TFLAG_LBA48) { 971 desc[2] |= 0x01; 972 desc[4] = tf->hob_nsect; 973 desc[6] = tf->hob_lbal; 974 desc[8] = tf->hob_lbam; 975 desc[10] = tf->hob_lbah; 976 } 977 } 978 979 /** 980 * ata_gen_ata_sense - generate a SCSI fixed sense block 981 * @qc: Command that we are erroring out 982 * 983 * Generate sense block for a failed ATA command @qc. Descriptor 984 * format is used to accomodate LBA48 block address. 985 * 986 * LOCKING: 987 * None. 988 */ 989 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 990 { 991 struct ata_device *dev = qc->dev; 992 struct scsi_cmnd *cmd = qc->scsicmd; 993 struct ata_taskfile *tf = &qc->result_tf; 994 unsigned char *sb = cmd->sense_buffer; 995 unsigned char *desc = sb + 8; 996 int verbose = qc->ap->ops->error_handler == NULL; 997 u64 block; 998 999 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1000 1001 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1002 1003 /* sense data is current and format is descriptor */ 1004 sb[0] = 0x72; 1005 1006 /* Use ata_to_sense_error() to map status register bits 1007 * onto sense key, asc & ascq. 1008 */ 1009 if (qc->err_mask || 1010 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1011 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1012 &sb[1], &sb[2], &sb[3], verbose); 1013 sb[1] &= 0x0f; 1014 } 1015 1016 block = ata_tf_read_block(&qc->result_tf, dev); 1017 1018 /* information sense data descriptor */ 1019 sb[7] = 12; 1020 desc[0] = 0x00; 1021 desc[1] = 10; 1022 1023 desc[2] |= 0x80; /* valid */ 1024 desc[6] = block >> 40; 1025 desc[7] = block >> 32; 1026 desc[8] = block >> 24; 1027 desc[9] = block >> 16; 1028 desc[10] = block >> 8; 1029 desc[11] = block; 1030 } 1031 1032 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1033 { 1034 sdev->use_10_for_rw = 1; 1035 sdev->use_10_for_ms = 1; 1036 1037 /* Schedule policy is determined by ->qc_defer() callback and 1038 * it needs to see every deferred qc. Set dev_blocked to 1 to 1039 * prevent SCSI midlayer from automatically deferring 1040 * requests. 1041 */ 1042 sdev->max_device_blocked = 1; 1043 } 1044 1045 /** 1046 * atapi_drain_needed - Check whether data transfer may overflow 1047 * @rq: request to be checked 1048 * 1049 * ATAPI commands which transfer variable length data to host 1050 * might overflow due to application error or hardare bug. This 1051 * function checks whether overflow should be drained and ignored 1052 * for @request. 1053 * 1054 * LOCKING: 1055 * None. 1056 * 1057 * RETURNS: 1058 * 1 if ; otherwise, 0. 1059 */ 1060 static int atapi_drain_needed(struct request *rq) 1061 { 1062 if (likely(!blk_pc_request(rq))) 1063 return 0; 1064 1065 if (!rq->data_len || (rq->cmd_flags & REQ_RW)) 1066 return 0; 1067 1068 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1069 } 1070 1071 static int ata_scsi_dev_config(struct scsi_device *sdev, 1072 struct ata_device *dev) 1073 { 1074 if (!ata_id_has_unload(dev->id)) 1075 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1076 1077 /* configure max sectors */ 1078 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 1079 1080 if (dev->class == ATA_DEV_ATAPI) { 1081 struct request_queue *q = sdev->request_queue; 1082 void *buf; 1083 1084 /* set the min alignment and padding */ 1085 blk_queue_update_dma_alignment(sdev->request_queue, 1086 ATA_DMA_PAD_SZ - 1); 1087 blk_queue_update_dma_pad(sdev->request_queue, 1088 ATA_DMA_PAD_SZ - 1); 1089 1090 /* configure draining */ 1091 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1092 if (!buf) { 1093 ata_dev_printk(dev, KERN_ERR, 1094 "drain buffer allocation failed\n"); 1095 return -ENOMEM; 1096 } 1097 1098 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1099 } else { 1100 if (ata_id_is_ssd(dev->id)) 1101 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, 1102 sdev->request_queue); 1103 1104 /* ATA devices must be sector aligned */ 1105 blk_queue_update_dma_alignment(sdev->request_queue, 1106 ATA_SECT_SIZE - 1); 1107 sdev->manage_start_stop = 1; 1108 } 1109 1110 if (dev->flags & ATA_DFLAG_AN) 1111 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1112 1113 if (dev->flags & ATA_DFLAG_NCQ) { 1114 int depth; 1115 1116 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1117 depth = min(ATA_MAX_QUEUE - 1, depth); 1118 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1119 } 1120 1121 return 0; 1122 } 1123 1124 /** 1125 * ata_scsi_slave_config - Set SCSI device attributes 1126 * @sdev: SCSI device to examine 1127 * 1128 * This is called before we actually start reading 1129 * and writing to the device, to configure certain 1130 * SCSI mid-layer behaviors. 1131 * 1132 * LOCKING: 1133 * Defined by SCSI layer. We don't really care. 1134 */ 1135 1136 int ata_scsi_slave_config(struct scsi_device *sdev) 1137 { 1138 struct ata_port *ap = ata_shost_to_port(sdev->host); 1139 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1140 int rc = 0; 1141 1142 ata_scsi_sdev_config(sdev); 1143 1144 if (dev) 1145 rc = ata_scsi_dev_config(sdev, dev); 1146 1147 return rc; 1148 } 1149 1150 /** 1151 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1152 * @sdev: SCSI device to be destroyed 1153 * 1154 * @sdev is about to be destroyed for hot/warm unplugging. If 1155 * this unplugging was initiated by libata as indicated by NULL 1156 * dev->sdev, this function doesn't have to do anything. 1157 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1158 * Clear dev->sdev, schedule the device for ATA detach and invoke 1159 * EH. 1160 * 1161 * LOCKING: 1162 * Defined by SCSI layer. We don't really care. 1163 */ 1164 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1165 { 1166 struct ata_port *ap = ata_shost_to_port(sdev->host); 1167 struct request_queue *q = sdev->request_queue; 1168 unsigned long flags; 1169 struct ata_device *dev; 1170 1171 if (!ap->ops->error_handler) 1172 return; 1173 1174 spin_lock_irqsave(ap->lock, flags); 1175 dev = __ata_scsi_find_dev(ap, sdev); 1176 if (dev && dev->sdev) { 1177 /* SCSI device already in CANCEL state, no need to offline it */ 1178 dev->sdev = NULL; 1179 dev->flags |= ATA_DFLAG_DETACH; 1180 ata_port_schedule_eh(ap); 1181 } 1182 spin_unlock_irqrestore(ap->lock, flags); 1183 1184 kfree(q->dma_drain_buffer); 1185 q->dma_drain_buffer = NULL; 1186 q->dma_drain_size = 0; 1187 } 1188 1189 /** 1190 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1191 * @sdev: SCSI device to configure queue depth for 1192 * @queue_depth: new queue depth 1193 * 1194 * This is libata standard hostt->change_queue_depth callback. 1195 * SCSI will call into this callback when user tries to set queue 1196 * depth via sysfs. 1197 * 1198 * LOCKING: 1199 * SCSI layer (we don't care) 1200 * 1201 * RETURNS: 1202 * Newly configured queue depth. 1203 */ 1204 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1205 { 1206 struct ata_port *ap = ata_shost_to_port(sdev->host); 1207 struct ata_device *dev; 1208 unsigned long flags; 1209 1210 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1211 return sdev->queue_depth; 1212 1213 dev = ata_scsi_find_dev(ap, sdev); 1214 if (!dev || !ata_dev_enabled(dev)) 1215 return sdev->queue_depth; 1216 1217 /* NCQ enabled? */ 1218 spin_lock_irqsave(ap->lock, flags); 1219 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1220 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1221 dev->flags |= ATA_DFLAG_NCQ_OFF; 1222 queue_depth = 1; 1223 } 1224 spin_unlock_irqrestore(ap->lock, flags); 1225 1226 /* limit and apply queue depth */ 1227 queue_depth = min(queue_depth, sdev->host->can_queue); 1228 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1229 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1230 1231 if (sdev->queue_depth == queue_depth) 1232 return -EINVAL; 1233 1234 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1235 return queue_depth; 1236 } 1237 1238 /* XXX: for spindown warning */ 1239 static void ata_delayed_done_timerfn(unsigned long arg) 1240 { 1241 struct scsi_cmnd *scmd = (void *)arg; 1242 1243 scmd->scsi_done(scmd); 1244 } 1245 1246 /* XXX: for spindown warning */ 1247 static void ata_delayed_done(struct scsi_cmnd *scmd) 1248 { 1249 static struct timer_list timer; 1250 1251 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd); 1252 mod_timer(&timer, jiffies + 5 * HZ); 1253 } 1254 1255 /** 1256 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1257 * @qc: Storage for translated ATA taskfile 1258 * 1259 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1260 * (to start). Perhaps these commands should be preceded by 1261 * CHECK POWER MODE to see what power mode the device is already in. 1262 * [See SAT revision 5 at www.t10.org] 1263 * 1264 * LOCKING: 1265 * spin_lock_irqsave(host lock) 1266 * 1267 * RETURNS: 1268 * Zero on success, non-zero on error. 1269 */ 1270 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1271 { 1272 struct scsi_cmnd *scmd = qc->scsicmd; 1273 struct ata_taskfile *tf = &qc->tf; 1274 const u8 *cdb = scmd->cmnd; 1275 1276 if (scmd->cmd_len < 5) 1277 goto invalid_fld; 1278 1279 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1280 tf->protocol = ATA_PROT_NODATA; 1281 if (cdb[1] & 0x1) { 1282 ; /* ignore IMMED bit, violates sat-r05 */ 1283 } 1284 if (cdb[4] & 0x2) 1285 goto invalid_fld; /* LOEJ bit set not supported */ 1286 if (((cdb[4] >> 4) & 0xf) != 0) 1287 goto invalid_fld; /* power conditions not supported */ 1288 1289 if (cdb[4] & 0x1) { 1290 tf->nsect = 1; /* 1 sector, lba=0 */ 1291 1292 if (qc->dev->flags & ATA_DFLAG_LBA) { 1293 tf->flags |= ATA_TFLAG_LBA; 1294 1295 tf->lbah = 0x0; 1296 tf->lbam = 0x0; 1297 tf->lbal = 0x0; 1298 tf->device |= ATA_LBA; 1299 } else { 1300 /* CHS */ 1301 tf->lbal = 0x1; /* sect */ 1302 tf->lbam = 0x0; /* cyl low */ 1303 tf->lbah = 0x0; /* cyl high */ 1304 } 1305 1306 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1307 } else { 1308 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1309 * or S5) causing some drives to spin up and down again. 1310 */ 1311 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1312 system_state == SYSTEM_POWER_OFF) 1313 goto skip; 1314 1315 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1316 system_entering_hibernation()) 1317 goto skip; 1318 1319 /* XXX: This is for backward compatibility, will be 1320 * removed. Read Documentation/feature-removal-schedule.txt 1321 * for more info. 1322 */ 1323 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) && 1324 (system_state == SYSTEM_HALT || 1325 system_state == SYSTEM_POWER_OFF)) { 1326 static unsigned long warned; 1327 1328 if (!test_and_set_bit(0, &warned)) { 1329 ata_dev_printk(qc->dev, KERN_WARNING, 1330 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. " 1331 "UPDATE SHUTDOWN UTILITY\n"); 1332 ata_dev_printk(qc->dev, KERN_WARNING, 1333 "For more info, visit " 1334 "http://linux-ata.org/shutdown.html\n"); 1335 1336 /* ->scsi_done is not used, use it for 1337 * delayed completion. 1338 */ 1339 scmd->scsi_done = qc->scsidone; 1340 qc->scsidone = ata_delayed_done; 1341 } 1342 goto skip; 1343 } 1344 1345 /* Issue ATA STANDBY IMMEDIATE command */ 1346 tf->command = ATA_CMD_STANDBYNOW1; 1347 } 1348 1349 /* 1350 * Standby and Idle condition timers could be implemented but that 1351 * would require libata to implement the Power condition mode page 1352 * and allow the user to change it. Changing mode pages requires 1353 * MODE SELECT to be implemented. 1354 */ 1355 1356 return 0; 1357 1358 invalid_fld: 1359 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1360 /* "Invalid field in cbd" */ 1361 return 1; 1362 skip: 1363 scmd->result = SAM_STAT_GOOD; 1364 return 1; 1365 } 1366 1367 1368 /** 1369 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1370 * @qc: Storage for translated ATA taskfile 1371 * 1372 * Sets up an ATA taskfile to issue FLUSH CACHE or 1373 * FLUSH CACHE EXT. 1374 * 1375 * LOCKING: 1376 * spin_lock_irqsave(host lock) 1377 * 1378 * RETURNS: 1379 * Zero on success, non-zero on error. 1380 */ 1381 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1382 { 1383 struct ata_taskfile *tf = &qc->tf; 1384 1385 tf->flags |= ATA_TFLAG_DEVICE; 1386 tf->protocol = ATA_PROT_NODATA; 1387 1388 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1389 tf->command = ATA_CMD_FLUSH_EXT; 1390 else 1391 tf->command = ATA_CMD_FLUSH; 1392 1393 /* flush is critical for IO integrity, consider it an IO command */ 1394 qc->flags |= ATA_QCFLAG_IO; 1395 1396 return 0; 1397 } 1398 1399 /** 1400 * scsi_6_lba_len - Get LBA and transfer length 1401 * @cdb: SCSI command to translate 1402 * 1403 * Calculate LBA and transfer length for 6-byte commands. 1404 * 1405 * RETURNS: 1406 * @plba: the LBA 1407 * @plen: the transfer length 1408 */ 1409 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1410 { 1411 u64 lba = 0; 1412 u32 len; 1413 1414 VPRINTK("six-byte command\n"); 1415 1416 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1417 lba |= ((u64)cdb[2]) << 8; 1418 lba |= ((u64)cdb[3]); 1419 1420 len = cdb[4]; 1421 1422 *plba = lba; 1423 *plen = len; 1424 } 1425 1426 /** 1427 * scsi_10_lba_len - Get LBA and transfer length 1428 * @cdb: SCSI command to translate 1429 * 1430 * Calculate LBA and transfer length for 10-byte commands. 1431 * 1432 * RETURNS: 1433 * @plba: the LBA 1434 * @plen: the transfer length 1435 */ 1436 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1437 { 1438 u64 lba = 0; 1439 u32 len = 0; 1440 1441 VPRINTK("ten-byte command\n"); 1442 1443 lba |= ((u64)cdb[2]) << 24; 1444 lba |= ((u64)cdb[3]) << 16; 1445 lba |= ((u64)cdb[4]) << 8; 1446 lba |= ((u64)cdb[5]); 1447 1448 len |= ((u32)cdb[7]) << 8; 1449 len |= ((u32)cdb[8]); 1450 1451 *plba = lba; 1452 *plen = len; 1453 } 1454 1455 /** 1456 * scsi_16_lba_len - Get LBA and transfer length 1457 * @cdb: SCSI command to translate 1458 * 1459 * Calculate LBA and transfer length for 16-byte commands. 1460 * 1461 * RETURNS: 1462 * @plba: the LBA 1463 * @plen: the transfer length 1464 */ 1465 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1466 { 1467 u64 lba = 0; 1468 u32 len = 0; 1469 1470 VPRINTK("sixteen-byte command\n"); 1471 1472 lba |= ((u64)cdb[2]) << 56; 1473 lba |= ((u64)cdb[3]) << 48; 1474 lba |= ((u64)cdb[4]) << 40; 1475 lba |= ((u64)cdb[5]) << 32; 1476 lba |= ((u64)cdb[6]) << 24; 1477 lba |= ((u64)cdb[7]) << 16; 1478 lba |= ((u64)cdb[8]) << 8; 1479 lba |= ((u64)cdb[9]); 1480 1481 len |= ((u32)cdb[10]) << 24; 1482 len |= ((u32)cdb[11]) << 16; 1483 len |= ((u32)cdb[12]) << 8; 1484 len |= ((u32)cdb[13]); 1485 1486 *plba = lba; 1487 *plen = len; 1488 } 1489 1490 /** 1491 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1492 * @qc: Storage for translated ATA taskfile 1493 * 1494 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1495 * 1496 * LOCKING: 1497 * spin_lock_irqsave(host lock) 1498 * 1499 * RETURNS: 1500 * Zero on success, non-zero on error. 1501 */ 1502 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1503 { 1504 struct scsi_cmnd *scmd = qc->scsicmd; 1505 struct ata_taskfile *tf = &qc->tf; 1506 struct ata_device *dev = qc->dev; 1507 u64 dev_sectors = qc->dev->n_sectors; 1508 const u8 *cdb = scmd->cmnd; 1509 u64 block; 1510 u32 n_block; 1511 1512 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1513 tf->protocol = ATA_PROT_NODATA; 1514 1515 if (cdb[0] == VERIFY) { 1516 if (scmd->cmd_len < 10) 1517 goto invalid_fld; 1518 scsi_10_lba_len(cdb, &block, &n_block); 1519 } else if (cdb[0] == VERIFY_16) { 1520 if (scmd->cmd_len < 16) 1521 goto invalid_fld; 1522 scsi_16_lba_len(cdb, &block, &n_block); 1523 } else 1524 goto invalid_fld; 1525 1526 if (!n_block) 1527 goto nothing_to_do; 1528 if (block >= dev_sectors) 1529 goto out_of_range; 1530 if ((block + n_block) > dev_sectors) 1531 goto out_of_range; 1532 1533 if (dev->flags & ATA_DFLAG_LBA) { 1534 tf->flags |= ATA_TFLAG_LBA; 1535 1536 if (lba_28_ok(block, n_block)) { 1537 /* use LBA28 */ 1538 tf->command = ATA_CMD_VERIFY; 1539 tf->device |= (block >> 24) & 0xf; 1540 } else if (lba_48_ok(block, n_block)) { 1541 if (!(dev->flags & ATA_DFLAG_LBA48)) 1542 goto out_of_range; 1543 1544 /* use LBA48 */ 1545 tf->flags |= ATA_TFLAG_LBA48; 1546 tf->command = ATA_CMD_VERIFY_EXT; 1547 1548 tf->hob_nsect = (n_block >> 8) & 0xff; 1549 1550 tf->hob_lbah = (block >> 40) & 0xff; 1551 tf->hob_lbam = (block >> 32) & 0xff; 1552 tf->hob_lbal = (block >> 24) & 0xff; 1553 } else 1554 /* request too large even for LBA48 */ 1555 goto out_of_range; 1556 1557 tf->nsect = n_block & 0xff; 1558 1559 tf->lbah = (block >> 16) & 0xff; 1560 tf->lbam = (block >> 8) & 0xff; 1561 tf->lbal = block & 0xff; 1562 1563 tf->device |= ATA_LBA; 1564 } else { 1565 /* CHS */ 1566 u32 sect, head, cyl, track; 1567 1568 if (!lba_28_ok(block, n_block)) 1569 goto out_of_range; 1570 1571 /* Convert LBA to CHS */ 1572 track = (u32)block / dev->sectors; 1573 cyl = track / dev->heads; 1574 head = track % dev->heads; 1575 sect = (u32)block % dev->sectors + 1; 1576 1577 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1578 (u32)block, track, cyl, head, sect); 1579 1580 /* Check whether the converted CHS can fit. 1581 Cylinder: 0-65535 1582 Head: 0-15 1583 Sector: 1-255*/ 1584 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1585 goto out_of_range; 1586 1587 tf->command = ATA_CMD_VERIFY; 1588 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1589 tf->lbal = sect; 1590 tf->lbam = cyl; 1591 tf->lbah = cyl >> 8; 1592 tf->device |= head; 1593 } 1594 1595 return 0; 1596 1597 invalid_fld: 1598 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1599 /* "Invalid field in cbd" */ 1600 return 1; 1601 1602 out_of_range: 1603 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1604 /* "Logical Block Address out of range" */ 1605 return 1; 1606 1607 nothing_to_do: 1608 scmd->result = SAM_STAT_GOOD; 1609 return 1; 1610 } 1611 1612 /** 1613 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1614 * @qc: Storage for translated ATA taskfile 1615 * 1616 * Converts any of six SCSI read/write commands into the 1617 * ATA counterpart, including starting sector (LBA), 1618 * sector count, and taking into account the device's LBA48 1619 * support. 1620 * 1621 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1622 * %WRITE_16 are currently supported. 1623 * 1624 * LOCKING: 1625 * spin_lock_irqsave(host lock) 1626 * 1627 * RETURNS: 1628 * Zero on success, non-zero on error. 1629 */ 1630 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1631 { 1632 struct scsi_cmnd *scmd = qc->scsicmd; 1633 const u8 *cdb = scmd->cmnd; 1634 unsigned int tf_flags = 0; 1635 u64 block; 1636 u32 n_block; 1637 int rc; 1638 1639 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1640 tf_flags |= ATA_TFLAG_WRITE; 1641 1642 /* Calculate the SCSI LBA, transfer length and FUA. */ 1643 switch (cdb[0]) { 1644 case READ_10: 1645 case WRITE_10: 1646 if (unlikely(scmd->cmd_len < 10)) 1647 goto invalid_fld; 1648 scsi_10_lba_len(cdb, &block, &n_block); 1649 if (unlikely(cdb[1] & (1 << 3))) 1650 tf_flags |= ATA_TFLAG_FUA; 1651 break; 1652 case READ_6: 1653 case WRITE_6: 1654 if (unlikely(scmd->cmd_len < 6)) 1655 goto invalid_fld; 1656 scsi_6_lba_len(cdb, &block, &n_block); 1657 1658 /* for 6-byte r/w commands, transfer length 0 1659 * means 256 blocks of data, not 0 block. 1660 */ 1661 if (!n_block) 1662 n_block = 256; 1663 break; 1664 case READ_16: 1665 case WRITE_16: 1666 if (unlikely(scmd->cmd_len < 16)) 1667 goto invalid_fld; 1668 scsi_16_lba_len(cdb, &block, &n_block); 1669 if (unlikely(cdb[1] & (1 << 3))) 1670 tf_flags |= ATA_TFLAG_FUA; 1671 break; 1672 default: 1673 DPRINTK("no-byte command\n"); 1674 goto invalid_fld; 1675 } 1676 1677 /* Check and compose ATA command */ 1678 if (!n_block) 1679 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1680 * length 0 means transfer 0 block of data. 1681 * However, for ATA R/W commands, sector count 0 means 1682 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1683 * 1684 * WARNING: one or two older ATA drives treat 0 as 0... 1685 */ 1686 goto nothing_to_do; 1687 1688 qc->flags |= ATA_QCFLAG_IO; 1689 qc->nbytes = n_block * ATA_SECT_SIZE; 1690 1691 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1692 qc->tag); 1693 if (likely(rc == 0)) 1694 return 0; 1695 1696 if (rc == -ERANGE) 1697 goto out_of_range; 1698 /* treat all other errors as -EINVAL, fall through */ 1699 invalid_fld: 1700 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1701 /* "Invalid field in cbd" */ 1702 return 1; 1703 1704 out_of_range: 1705 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1706 /* "Logical Block Address out of range" */ 1707 return 1; 1708 1709 nothing_to_do: 1710 scmd->result = SAM_STAT_GOOD; 1711 return 1; 1712 } 1713 1714 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1715 { 1716 struct ata_port *ap = qc->ap; 1717 struct scsi_cmnd *cmd = qc->scsicmd; 1718 u8 *cdb = cmd->cmnd; 1719 int need_sense = (qc->err_mask != 0); 1720 1721 /* For ATA pass thru (SAT) commands, generate a sense block if 1722 * user mandated it or if there's an error. Note that if we 1723 * generate because the user forced us to, a check condition 1724 * is generated and the ATA register values are returned 1725 * whether the command completed successfully or not. If there 1726 * was no error, SK, ASC and ASCQ will all be zero. 1727 */ 1728 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1729 ((cdb[2] & 0x20) || need_sense)) { 1730 ata_gen_passthru_sense(qc); 1731 } else { 1732 if (!need_sense) { 1733 cmd->result = SAM_STAT_GOOD; 1734 } else { 1735 /* TODO: decide which descriptor format to use 1736 * for 48b LBA devices and call that here 1737 * instead of the fixed desc, which is only 1738 * good for smaller LBA (and maybe CHS?) 1739 * devices. 1740 */ 1741 ata_gen_ata_sense(qc); 1742 } 1743 } 1744 1745 /* XXX: track spindown state for spindown skipping and warning */ 1746 if (unlikely(qc->tf.command == ATA_CMD_STANDBY || 1747 qc->tf.command == ATA_CMD_STANDBYNOW1)) 1748 qc->dev->flags |= ATA_DFLAG_SPUNDOWN; 1749 else if (likely(system_state != SYSTEM_HALT && 1750 system_state != SYSTEM_POWER_OFF)) 1751 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN; 1752 1753 if (need_sense && !ap->ops->error_handler) 1754 ata_dump_status(ap->print_id, &qc->result_tf); 1755 1756 qc->scsidone(cmd); 1757 1758 ata_qc_free(qc); 1759 } 1760 1761 /** 1762 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1763 * @dev: ATA device to which the command is addressed 1764 * @cmd: SCSI command to execute 1765 * @done: SCSI command completion function 1766 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1767 * 1768 * Our ->queuecommand() function has decided that the SCSI 1769 * command issued can be directly translated into an ATA 1770 * command, rather than handled internally. 1771 * 1772 * This function sets up an ata_queued_cmd structure for the 1773 * SCSI command, and sends that ata_queued_cmd to the hardware. 1774 * 1775 * The xlat_func argument (actor) returns 0 if ready to execute 1776 * ATA command, else 1 to finish translation. If 1 is returned 1777 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1778 * to be set reflecting an error condition or clean (early) 1779 * termination. 1780 * 1781 * LOCKING: 1782 * spin_lock_irqsave(host lock) 1783 * 1784 * RETURNS: 1785 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1786 * needs to be deferred. 1787 */ 1788 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1789 void (*done)(struct scsi_cmnd *), 1790 ata_xlat_func_t xlat_func) 1791 { 1792 struct ata_port *ap = dev->link->ap; 1793 struct ata_queued_cmd *qc; 1794 int rc; 1795 1796 VPRINTK("ENTER\n"); 1797 1798 qc = ata_scsi_qc_new(dev, cmd, done); 1799 if (!qc) 1800 goto err_mem; 1801 1802 /* data is present; dma-map it */ 1803 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1804 cmd->sc_data_direction == DMA_TO_DEVICE) { 1805 if (unlikely(scsi_bufflen(cmd) < 1)) { 1806 ata_dev_printk(dev, KERN_WARNING, 1807 "WARNING: zero len r/w req\n"); 1808 goto err_did; 1809 } 1810 1811 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1812 1813 qc->dma_dir = cmd->sc_data_direction; 1814 } 1815 1816 qc->complete_fn = ata_scsi_qc_complete; 1817 1818 if (xlat_func(qc)) 1819 goto early_finish; 1820 1821 if (ap->ops->qc_defer) { 1822 if ((rc = ap->ops->qc_defer(qc))) 1823 goto defer; 1824 } 1825 1826 /* select device, send command to hardware */ 1827 ata_qc_issue(qc); 1828 1829 VPRINTK("EXIT\n"); 1830 return 0; 1831 1832 early_finish: 1833 ata_qc_free(qc); 1834 qc->scsidone(cmd); 1835 DPRINTK("EXIT - early finish (good or error)\n"); 1836 return 0; 1837 1838 err_did: 1839 ata_qc_free(qc); 1840 cmd->result = (DID_ERROR << 16); 1841 qc->scsidone(cmd); 1842 err_mem: 1843 DPRINTK("EXIT - internal\n"); 1844 return 0; 1845 1846 defer: 1847 ata_qc_free(qc); 1848 DPRINTK("EXIT - defer\n"); 1849 if (rc == ATA_DEFER_LINK) 1850 return SCSI_MLQUEUE_DEVICE_BUSY; 1851 else 1852 return SCSI_MLQUEUE_HOST_BUSY; 1853 } 1854 1855 /** 1856 * ata_scsi_rbuf_get - Map response buffer. 1857 * @cmd: SCSI command containing buffer to be mapped. 1858 * @flags: unsigned long variable to store irq enable status 1859 * @copy_in: copy in from user buffer 1860 * 1861 * Prepare buffer for simulated SCSI commands. 1862 * 1863 * LOCKING: 1864 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1865 * 1866 * RETURNS: 1867 * Pointer to response buffer. 1868 */ 1869 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1870 unsigned long *flags) 1871 { 1872 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1873 1874 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1875 if (copy_in) 1876 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1877 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1878 return ata_scsi_rbuf; 1879 } 1880 1881 /** 1882 * ata_scsi_rbuf_put - Unmap response buffer. 1883 * @cmd: SCSI command containing buffer to be unmapped. 1884 * @copy_out: copy out result 1885 * @flags: @flags passed to ata_scsi_rbuf_get() 1886 * 1887 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1888 * @copy_back is true. 1889 * 1890 * LOCKING: 1891 * Unlocks ata_scsi_rbuf_lock. 1892 */ 1893 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1894 unsigned long *flags) 1895 { 1896 if (copy_out) 1897 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1898 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1899 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1900 } 1901 1902 /** 1903 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1904 * @args: device IDENTIFY data / SCSI command of interest. 1905 * @actor: Callback hook for desired SCSI command simulator 1906 * 1907 * Takes care of the hard work of simulating a SCSI command... 1908 * Mapping the response buffer, calling the command's handler, 1909 * and handling the handler's return value. This return value 1910 * indicates whether the handler wishes the SCSI command to be 1911 * completed successfully (0), or not (in which case cmd->result 1912 * and sense buffer are assumed to be set). 1913 * 1914 * LOCKING: 1915 * spin_lock_irqsave(host lock) 1916 */ 1917 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1918 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1919 { 1920 u8 *rbuf; 1921 unsigned int rc; 1922 struct scsi_cmnd *cmd = args->cmd; 1923 unsigned long flags; 1924 1925 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1926 rc = actor(args, rbuf); 1927 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1928 1929 if (rc == 0) 1930 cmd->result = SAM_STAT_GOOD; 1931 args->done(cmd); 1932 } 1933 1934 /** 1935 * ata_scsiop_inq_std - Simulate INQUIRY command 1936 * @args: device IDENTIFY data / SCSI command of interest. 1937 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1938 * 1939 * Returns standard device identification data associated 1940 * with non-VPD INQUIRY command output. 1941 * 1942 * LOCKING: 1943 * spin_lock_irqsave(host lock) 1944 */ 1945 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1946 { 1947 const u8 versions[] = { 1948 0x60, /* SAM-3 (no version claimed) */ 1949 1950 0x03, 1951 0x20, /* SBC-2 (no version claimed) */ 1952 1953 0x02, 1954 0x60 /* SPC-3 (no version claimed) */ 1955 }; 1956 u8 hdr[] = { 1957 TYPE_DISK, 1958 0, 1959 0x5, /* claim SPC-3 version compatibility */ 1960 2, 1961 95 - 4 1962 }; 1963 1964 VPRINTK("ENTER\n"); 1965 1966 /* set scsi removeable (RMB) bit per ata bit */ 1967 if (ata_id_removeable(args->id)) 1968 hdr[1] |= (1 << 7); 1969 1970 memcpy(rbuf, hdr, sizeof(hdr)); 1971 memcpy(&rbuf[8], "ATA ", 8); 1972 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1973 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1974 1975 if (rbuf[32] == 0 || rbuf[32] == ' ') 1976 memcpy(&rbuf[32], "n/a ", 4); 1977 1978 memcpy(rbuf + 59, versions, sizeof(versions)); 1979 1980 return 0; 1981 } 1982 1983 /** 1984 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1985 * @args: device IDENTIFY data / SCSI command of interest. 1986 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1987 * 1988 * Returns list of inquiry VPD pages available. 1989 * 1990 * LOCKING: 1991 * spin_lock_irqsave(host lock) 1992 */ 1993 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1994 { 1995 const u8 pages[] = { 1996 0x00, /* page 0x00, this page */ 1997 0x80, /* page 0x80, unit serial no page */ 1998 0x83, /* page 0x83, device ident page */ 1999 0x89, /* page 0x89, ata info page */ 2000 0xb1, /* page 0xb1, block device characteristics page */ 2001 }; 2002 2003 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2004 memcpy(rbuf + 4, pages, sizeof(pages)); 2005 return 0; 2006 } 2007 2008 /** 2009 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2010 * @args: device IDENTIFY data / SCSI command of interest. 2011 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2012 * 2013 * Returns ATA device serial number. 2014 * 2015 * LOCKING: 2016 * spin_lock_irqsave(host lock) 2017 */ 2018 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2019 { 2020 const u8 hdr[] = { 2021 0, 2022 0x80, /* this page code */ 2023 0, 2024 ATA_ID_SERNO_LEN, /* page len */ 2025 }; 2026 2027 memcpy(rbuf, hdr, sizeof(hdr)); 2028 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2029 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2030 return 0; 2031 } 2032 2033 /** 2034 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2035 * @args: device IDENTIFY data / SCSI command of interest. 2036 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2037 * 2038 * Yields two logical unit device identification designators: 2039 * - vendor specific ASCII containing the ATA serial number 2040 * - SAT defined "t10 vendor id based" containing ASCII vendor 2041 * name ("ATA "), model and serial numbers. 2042 * 2043 * LOCKING: 2044 * spin_lock_irqsave(host lock) 2045 */ 2046 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2047 { 2048 const int sat_model_serial_desc_len = 68; 2049 int num; 2050 2051 rbuf[1] = 0x83; /* this page code */ 2052 num = 4; 2053 2054 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2055 rbuf[num + 0] = 2; 2056 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2057 num += 4; 2058 ata_id_string(args->id, (unsigned char *) rbuf + num, 2059 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2060 num += ATA_ID_SERNO_LEN; 2061 2062 /* SAT defined lu model and serial numbers descriptor */ 2063 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2064 rbuf[num + 0] = 2; 2065 rbuf[num + 1] = 1; 2066 rbuf[num + 3] = sat_model_serial_desc_len; 2067 num += 4; 2068 memcpy(rbuf + num, "ATA ", 8); 2069 num += 8; 2070 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2071 ATA_ID_PROD_LEN); 2072 num += ATA_ID_PROD_LEN; 2073 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2074 ATA_ID_SERNO_LEN); 2075 num += ATA_ID_SERNO_LEN; 2076 2077 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2078 return 0; 2079 } 2080 2081 /** 2082 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2083 * @args: device IDENTIFY data / SCSI command of interest. 2084 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2085 * 2086 * Yields SAT-specified ATA VPD page. 2087 * 2088 * LOCKING: 2089 * spin_lock_irqsave(host lock) 2090 */ 2091 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2092 { 2093 struct ata_taskfile tf; 2094 2095 memset(&tf, 0, sizeof(tf)); 2096 2097 rbuf[1] = 0x89; /* our page code */ 2098 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2099 rbuf[3] = (0x238 & 0xff); 2100 2101 memcpy(&rbuf[8], "linux ", 8); 2102 memcpy(&rbuf[16], "libata ", 16); 2103 memcpy(&rbuf[32], DRV_VERSION, 4); 2104 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2105 2106 /* we don't store the ATA device signature, so we fake it */ 2107 2108 tf.command = ATA_DRDY; /* really, this is Status reg */ 2109 tf.lbal = 0x1; 2110 tf.nsect = 0x1; 2111 2112 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2113 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2114 2115 rbuf[56] = ATA_CMD_ID_ATA; 2116 2117 memcpy(&rbuf[60], &args->id[0], 512); 2118 return 0; 2119 } 2120 2121 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2122 { 2123 rbuf[1] = 0xb1; 2124 rbuf[3] = 0x3c; 2125 if (ata_id_major_version(args->id) > 7) { 2126 rbuf[4] = args->id[217] >> 8; 2127 rbuf[5] = args->id[217]; 2128 rbuf[7] = args->id[168] & 0xf; 2129 } 2130 2131 return 0; 2132 } 2133 2134 /** 2135 * ata_scsiop_noop - Command handler that simply returns success. 2136 * @args: device IDENTIFY data / SCSI command of interest. 2137 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2138 * 2139 * No operation. Simply returns success to caller, to indicate 2140 * that the caller should successfully complete this SCSI command. 2141 * 2142 * LOCKING: 2143 * spin_lock_irqsave(host lock) 2144 */ 2145 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2146 { 2147 VPRINTK("ENTER\n"); 2148 return 0; 2149 } 2150 2151 /** 2152 * ata_msense_caching - Simulate MODE SENSE caching info page 2153 * @id: device IDENTIFY data 2154 * @buf: output buffer 2155 * 2156 * Generate a caching info page, which conditionally indicates 2157 * write caching to the SCSI layer, depending on device 2158 * capabilities. 2159 * 2160 * LOCKING: 2161 * None. 2162 */ 2163 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2164 { 2165 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2166 if (ata_id_wcache_enabled(id)) 2167 buf[2] |= (1 << 2); /* write cache enable */ 2168 if (!ata_id_rahead_enabled(id)) 2169 buf[12] |= (1 << 5); /* disable read ahead */ 2170 return sizeof(def_cache_mpage); 2171 } 2172 2173 /** 2174 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2175 * @buf: output buffer 2176 * 2177 * Generate a generic MODE SENSE control mode page. 2178 * 2179 * LOCKING: 2180 * None. 2181 */ 2182 static unsigned int ata_msense_ctl_mode(u8 *buf) 2183 { 2184 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2185 return sizeof(def_control_mpage); 2186 } 2187 2188 /** 2189 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2190 * @buf: output buffer 2191 * 2192 * Generate a generic MODE SENSE r/w error recovery page. 2193 * 2194 * LOCKING: 2195 * None. 2196 */ 2197 static unsigned int ata_msense_rw_recovery(u8 *buf) 2198 { 2199 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2200 return sizeof(def_rw_recovery_mpage); 2201 } 2202 2203 /* 2204 * We can turn this into a real blacklist if it's needed, for now just 2205 * blacklist any Maxtor BANC1G10 revision firmware 2206 */ 2207 static int ata_dev_supports_fua(u16 *id) 2208 { 2209 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2210 2211 if (!libata_fua) 2212 return 0; 2213 if (!ata_id_has_fua(id)) 2214 return 0; 2215 2216 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2217 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2218 2219 if (strcmp(model, "Maxtor")) 2220 return 1; 2221 if (strcmp(fw, "BANC1G10")) 2222 return 1; 2223 2224 return 0; /* blacklisted */ 2225 } 2226 2227 /** 2228 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2229 * @args: device IDENTIFY data / SCSI command of interest. 2230 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2231 * 2232 * Simulate MODE SENSE commands. Assume this is invoked for direct 2233 * access devices (e.g. disks) only. There should be no block 2234 * descriptor for other device types. 2235 * 2236 * LOCKING: 2237 * spin_lock_irqsave(host lock) 2238 */ 2239 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2240 { 2241 struct ata_device *dev = args->dev; 2242 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2243 const u8 sat_blk_desc[] = { 2244 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2245 0, 2246 0, 0x2, 0x0 /* block length: 512 bytes */ 2247 }; 2248 u8 pg, spg; 2249 unsigned int ebd, page_control, six_byte; 2250 u8 dpofua; 2251 2252 VPRINTK("ENTER\n"); 2253 2254 six_byte = (scsicmd[0] == MODE_SENSE); 2255 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2256 /* 2257 * LLBA bit in msense(10) ignored (compliant) 2258 */ 2259 2260 page_control = scsicmd[2] >> 6; 2261 switch (page_control) { 2262 case 0: /* current */ 2263 break; /* supported */ 2264 case 3: /* saved */ 2265 goto saving_not_supp; 2266 case 1: /* changeable */ 2267 case 2: /* defaults */ 2268 default: 2269 goto invalid_fld; 2270 } 2271 2272 if (six_byte) 2273 p += 4 + (ebd ? 8 : 0); 2274 else 2275 p += 8 + (ebd ? 8 : 0); 2276 2277 pg = scsicmd[2] & 0x3f; 2278 spg = scsicmd[3]; 2279 /* 2280 * No mode subpages supported (yet) but asking for _all_ 2281 * subpages may be valid 2282 */ 2283 if (spg && (spg != ALL_SUB_MPAGES)) 2284 goto invalid_fld; 2285 2286 switch(pg) { 2287 case RW_RECOVERY_MPAGE: 2288 p += ata_msense_rw_recovery(p); 2289 break; 2290 2291 case CACHE_MPAGE: 2292 p += ata_msense_caching(args->id, p); 2293 break; 2294 2295 case CONTROL_MPAGE: 2296 p += ata_msense_ctl_mode(p); 2297 break; 2298 2299 case ALL_MPAGES: 2300 p += ata_msense_rw_recovery(p); 2301 p += ata_msense_caching(args->id, p); 2302 p += ata_msense_ctl_mode(p); 2303 break; 2304 2305 default: /* invalid page code */ 2306 goto invalid_fld; 2307 } 2308 2309 dpofua = 0; 2310 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2311 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2312 dpofua = 1 << 4; 2313 2314 if (six_byte) { 2315 rbuf[0] = p - rbuf - 1; 2316 rbuf[2] |= dpofua; 2317 if (ebd) { 2318 rbuf[3] = sizeof(sat_blk_desc); 2319 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2320 } 2321 } else { 2322 unsigned int output_len = p - rbuf - 2; 2323 2324 rbuf[0] = output_len >> 8; 2325 rbuf[1] = output_len; 2326 rbuf[3] |= dpofua; 2327 if (ebd) { 2328 rbuf[7] = sizeof(sat_blk_desc); 2329 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2330 } 2331 } 2332 return 0; 2333 2334 invalid_fld: 2335 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2336 /* "Invalid field in cbd" */ 2337 return 1; 2338 2339 saving_not_supp: 2340 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2341 /* "Saving parameters not supported" */ 2342 return 1; 2343 } 2344 2345 /** 2346 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2347 * @args: device IDENTIFY data / SCSI command of interest. 2348 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2349 * 2350 * Simulate READ CAPACITY commands. 2351 * 2352 * LOCKING: 2353 * None. 2354 */ 2355 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2356 { 2357 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */ 2358 2359 VPRINTK("ENTER\n"); 2360 2361 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2362 if (last_lba >= 0xffffffffULL) 2363 last_lba = 0xffffffff; 2364 2365 /* sector count, 32-bit */ 2366 rbuf[0] = last_lba >> (8 * 3); 2367 rbuf[1] = last_lba >> (8 * 2); 2368 rbuf[2] = last_lba >> (8 * 1); 2369 rbuf[3] = last_lba; 2370 2371 /* sector size */ 2372 rbuf[6] = ATA_SECT_SIZE >> 8; 2373 rbuf[7] = ATA_SECT_SIZE & 0xff; 2374 } else { 2375 /* sector count, 64-bit */ 2376 rbuf[0] = last_lba >> (8 * 7); 2377 rbuf[1] = last_lba >> (8 * 6); 2378 rbuf[2] = last_lba >> (8 * 5); 2379 rbuf[3] = last_lba >> (8 * 4); 2380 rbuf[4] = last_lba >> (8 * 3); 2381 rbuf[5] = last_lba >> (8 * 2); 2382 rbuf[6] = last_lba >> (8 * 1); 2383 rbuf[7] = last_lba; 2384 2385 /* sector size */ 2386 rbuf[10] = ATA_SECT_SIZE >> 8; 2387 rbuf[11] = ATA_SECT_SIZE & 0xff; 2388 } 2389 2390 return 0; 2391 } 2392 2393 /** 2394 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2395 * @args: device IDENTIFY data / SCSI command of interest. 2396 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2397 * 2398 * Simulate REPORT LUNS command. 2399 * 2400 * LOCKING: 2401 * spin_lock_irqsave(host lock) 2402 */ 2403 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2404 { 2405 VPRINTK("ENTER\n"); 2406 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2407 2408 return 0; 2409 } 2410 2411 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2412 { 2413 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2414 /* FIXME: not quite right; we don't want the 2415 * translation of taskfile registers into 2416 * a sense descriptors, since that's only 2417 * correct for ATA, not ATAPI 2418 */ 2419 ata_gen_passthru_sense(qc); 2420 } 2421 2422 qc->scsidone(qc->scsicmd); 2423 ata_qc_free(qc); 2424 } 2425 2426 /* is it pointless to prefer PIO for "safety reasons"? */ 2427 static inline int ata_pio_use_silly(struct ata_port *ap) 2428 { 2429 return (ap->flags & ATA_FLAG_PIO_DMA); 2430 } 2431 2432 static void atapi_request_sense(struct ata_queued_cmd *qc) 2433 { 2434 struct ata_port *ap = qc->ap; 2435 struct scsi_cmnd *cmd = qc->scsicmd; 2436 2437 DPRINTK("ATAPI request sense\n"); 2438 2439 /* FIXME: is this needed? */ 2440 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2441 2442 #ifdef CONFIG_ATA_SFF 2443 if (ap->ops->sff_tf_read) 2444 ap->ops->sff_tf_read(ap, &qc->tf); 2445 #endif 2446 2447 /* fill these in, for the case where they are -not- overwritten */ 2448 cmd->sense_buffer[0] = 0x70; 2449 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2450 2451 ata_qc_reinit(qc); 2452 2453 /* setup sg table and init transfer direction */ 2454 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2455 ata_sg_init(qc, &qc->sgent, 1); 2456 qc->dma_dir = DMA_FROM_DEVICE; 2457 2458 memset(&qc->cdb, 0, qc->dev->cdb_len); 2459 qc->cdb[0] = REQUEST_SENSE; 2460 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2461 2462 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2463 qc->tf.command = ATA_CMD_PACKET; 2464 2465 if (ata_pio_use_silly(ap)) { 2466 qc->tf.protocol = ATAPI_PROT_DMA; 2467 qc->tf.feature |= ATAPI_PKT_DMA; 2468 } else { 2469 qc->tf.protocol = ATAPI_PROT_PIO; 2470 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2471 qc->tf.lbah = 0; 2472 } 2473 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2474 2475 qc->complete_fn = atapi_sense_complete; 2476 2477 ata_qc_issue(qc); 2478 2479 DPRINTK("EXIT\n"); 2480 } 2481 2482 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2483 { 2484 struct scsi_cmnd *cmd = qc->scsicmd; 2485 unsigned int err_mask = qc->err_mask; 2486 2487 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2488 2489 /* handle completion from new EH */ 2490 if (unlikely(qc->ap->ops->error_handler && 2491 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2492 2493 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2494 /* FIXME: not quite right; we don't want the 2495 * translation of taskfile registers into a 2496 * sense descriptors, since that's only 2497 * correct for ATA, not ATAPI 2498 */ 2499 ata_gen_passthru_sense(qc); 2500 } 2501 2502 /* SCSI EH automatically locks door if sdev->locked is 2503 * set. Sometimes door lock request continues to 2504 * fail, for example, when no media is present. This 2505 * creates a loop - SCSI EH issues door lock which 2506 * fails and gets invoked again to acquire sense data 2507 * for the failed command. 2508 * 2509 * If door lock fails, always clear sdev->locked to 2510 * avoid this infinite loop. 2511 */ 2512 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2513 qc->dev->sdev->locked = 0; 2514 2515 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2516 qc->scsidone(cmd); 2517 ata_qc_free(qc); 2518 return; 2519 } 2520 2521 /* successful completion or old EH failure path */ 2522 if (unlikely(err_mask & AC_ERR_DEV)) { 2523 cmd->result = SAM_STAT_CHECK_CONDITION; 2524 atapi_request_sense(qc); 2525 return; 2526 } else if (unlikely(err_mask)) { 2527 /* FIXME: not quite right; we don't want the 2528 * translation of taskfile registers into 2529 * a sense descriptors, since that's only 2530 * correct for ATA, not ATAPI 2531 */ 2532 ata_gen_passthru_sense(qc); 2533 } else { 2534 u8 *scsicmd = cmd->cmnd; 2535 2536 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2537 unsigned long flags; 2538 u8 *buf; 2539 2540 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2541 2542 /* ATAPI devices typically report zero for their SCSI version, 2543 * and sometimes deviate from the spec WRT response data 2544 * format. If SCSI version is reported as zero like normal, 2545 * then we make the following fixups: 1) Fake MMC-5 version, 2546 * to indicate to the Linux scsi midlayer this is a modern 2547 * device. 2) Ensure response data format / ATAPI information 2548 * are always correct. 2549 */ 2550 if (buf[2] == 0) { 2551 buf[2] = 0x5; 2552 buf[3] = 0x32; 2553 } 2554 2555 ata_scsi_rbuf_put(cmd, true, &flags); 2556 } 2557 2558 cmd->result = SAM_STAT_GOOD; 2559 } 2560 2561 qc->scsidone(cmd); 2562 ata_qc_free(qc); 2563 } 2564 /** 2565 * atapi_xlat - Initialize PACKET taskfile 2566 * @qc: command structure to be initialized 2567 * 2568 * LOCKING: 2569 * spin_lock_irqsave(host lock) 2570 * 2571 * RETURNS: 2572 * Zero on success, non-zero on failure. 2573 */ 2574 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2575 { 2576 struct scsi_cmnd *scmd = qc->scsicmd; 2577 struct ata_device *dev = qc->dev; 2578 int nodata = (scmd->sc_data_direction == DMA_NONE); 2579 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2580 unsigned int nbytes; 2581 2582 memset(qc->cdb, 0, dev->cdb_len); 2583 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2584 2585 qc->complete_fn = atapi_qc_complete; 2586 2587 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2588 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2589 qc->tf.flags |= ATA_TFLAG_WRITE; 2590 DPRINTK("direction: write\n"); 2591 } 2592 2593 qc->tf.command = ATA_CMD_PACKET; 2594 ata_qc_set_pc_nbytes(qc); 2595 2596 /* check whether ATAPI DMA is safe */ 2597 if (!nodata && !using_pio && atapi_check_dma(qc)) 2598 using_pio = 1; 2599 2600 /* Some controller variants snoop this value for Packet 2601 * transfers to do state machine and FIFO management. Thus we 2602 * want to set it properly, and for DMA where it is 2603 * effectively meaningless. 2604 */ 2605 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2606 2607 /* Most ATAPI devices which honor transfer chunk size don't 2608 * behave according to the spec when odd chunk size which 2609 * matches the transfer length is specified. If the number of 2610 * bytes to transfer is 2n+1. According to the spec, what 2611 * should happen is to indicate that 2n+1 is going to be 2612 * transferred and transfer 2n+2 bytes where the last byte is 2613 * padding. 2614 * 2615 * In practice, this doesn't happen. ATAPI devices first 2616 * indicate and transfer 2n bytes and then indicate and 2617 * transfer 2 bytes where the last byte is padding. 2618 * 2619 * This inconsistency confuses several controllers which 2620 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2621 * These controllers use actual number of transferred bytes to 2622 * update DMA poitner and transfer of 4n+2 bytes make those 2623 * controller push DMA pointer by 4n+4 bytes because SATA data 2624 * FISes are aligned to 4 bytes. This causes data corruption 2625 * and buffer overrun. 2626 * 2627 * Always setting nbytes to even number solves this problem 2628 * because then ATAPI devices don't have to split data at 2n 2629 * boundaries. 2630 */ 2631 if (nbytes & 0x1) 2632 nbytes++; 2633 2634 qc->tf.lbam = (nbytes & 0xFF); 2635 qc->tf.lbah = (nbytes >> 8); 2636 2637 if (nodata) 2638 qc->tf.protocol = ATAPI_PROT_NODATA; 2639 else if (using_pio) 2640 qc->tf.protocol = ATAPI_PROT_PIO; 2641 else { 2642 /* DMA data xfer */ 2643 qc->tf.protocol = ATAPI_PROT_DMA; 2644 qc->tf.feature |= ATAPI_PKT_DMA; 2645 2646 if ((dev->flags & ATA_DFLAG_DMADIR) && 2647 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2648 /* some SATA bridges need us to indicate data xfer direction */ 2649 qc->tf.feature |= ATAPI_DMADIR; 2650 } 2651 2652 2653 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2654 as ATAPI tape drives don't get this right otherwise */ 2655 return 0; 2656 } 2657 2658 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2659 { 2660 if (!sata_pmp_attached(ap)) { 2661 if (likely(devno < ata_link_max_devices(&ap->link))) 2662 return &ap->link.device[devno]; 2663 } else { 2664 if (likely(devno < ap->nr_pmp_links)) 2665 return &ap->pmp_link[devno].device[0]; 2666 } 2667 2668 return NULL; 2669 } 2670 2671 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2672 const struct scsi_device *scsidev) 2673 { 2674 int devno; 2675 2676 /* skip commands not addressed to targets we simulate */ 2677 if (!sata_pmp_attached(ap)) { 2678 if (unlikely(scsidev->channel || scsidev->lun)) 2679 return NULL; 2680 devno = scsidev->id; 2681 } else { 2682 if (unlikely(scsidev->id || scsidev->lun)) 2683 return NULL; 2684 devno = scsidev->channel; 2685 } 2686 2687 return ata_find_dev(ap, devno); 2688 } 2689 2690 /** 2691 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2692 * @ap: ATA port to which the device is attached 2693 * @scsidev: SCSI device from which we derive the ATA device 2694 * 2695 * Given various information provided in struct scsi_cmnd, 2696 * map that onto an ATA bus, and using that mapping 2697 * determine which ata_device is associated with the 2698 * SCSI command to be sent. 2699 * 2700 * LOCKING: 2701 * spin_lock_irqsave(host lock) 2702 * 2703 * RETURNS: 2704 * Associated ATA device, or %NULL if not found. 2705 */ 2706 static struct ata_device * 2707 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2708 { 2709 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2710 2711 if (unlikely(!dev || !ata_dev_enabled(dev))) 2712 return NULL; 2713 2714 return dev; 2715 } 2716 2717 /* 2718 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2719 * @byte1: Byte 1 from pass-thru CDB. 2720 * 2721 * RETURNS: 2722 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2723 */ 2724 static u8 2725 ata_scsi_map_proto(u8 byte1) 2726 { 2727 switch((byte1 & 0x1e) >> 1) { 2728 case 3: /* Non-data */ 2729 return ATA_PROT_NODATA; 2730 2731 case 6: /* DMA */ 2732 case 10: /* UDMA Data-in */ 2733 case 11: /* UDMA Data-Out */ 2734 return ATA_PROT_DMA; 2735 2736 case 4: /* PIO Data-in */ 2737 case 5: /* PIO Data-out */ 2738 return ATA_PROT_PIO; 2739 2740 case 0: /* Hard Reset */ 2741 case 1: /* SRST */ 2742 case 8: /* Device Diagnostic */ 2743 case 9: /* Device Reset */ 2744 case 7: /* DMA Queued */ 2745 case 12: /* FPDMA */ 2746 case 15: /* Return Response Info */ 2747 default: /* Reserved */ 2748 break; 2749 } 2750 2751 return ATA_PROT_UNKNOWN; 2752 } 2753 2754 /** 2755 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2756 * @qc: command structure to be initialized 2757 * 2758 * Handles either 12 or 16-byte versions of the CDB. 2759 * 2760 * RETURNS: 2761 * Zero on success, non-zero on failure. 2762 */ 2763 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2764 { 2765 struct ata_taskfile *tf = &(qc->tf); 2766 struct scsi_cmnd *scmd = qc->scsicmd; 2767 struct ata_device *dev = qc->dev; 2768 const u8 *cdb = scmd->cmnd; 2769 2770 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2771 goto invalid_fld; 2772 2773 /* 2774 * Filter TPM commands by default. These provide an 2775 * essentially uncontrolled encrypted "back door" between 2776 * applications and the disk. Set libata.allow_tpm=1 if you 2777 * have a real reason for wanting to use them. This ensures 2778 * that installed software cannot easily mess stuff up without 2779 * user intent. DVR type users will probably ship with this enabled 2780 * for movie content management. 2781 * 2782 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2783 * for this and should do in future but that it is not sufficient as 2784 * DCS is an optional feature set. Thus we also do the software filter 2785 * so that we comply with the TC consortium stated goal that the user 2786 * can turn off TC features of their system. 2787 */ 2788 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2789 goto invalid_fld; 2790 2791 /* We may not issue DMA commands if no DMA mode is set */ 2792 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2793 goto invalid_fld; 2794 2795 /* 2796 * 12 and 16 byte CDBs use different offsets to 2797 * provide the various register values. 2798 */ 2799 if (cdb[0] == ATA_16) { 2800 /* 2801 * 16-byte CDB - may contain extended commands. 2802 * 2803 * If that is the case, copy the upper byte register values. 2804 */ 2805 if (cdb[1] & 0x01) { 2806 tf->hob_feature = cdb[3]; 2807 tf->hob_nsect = cdb[5]; 2808 tf->hob_lbal = cdb[7]; 2809 tf->hob_lbam = cdb[9]; 2810 tf->hob_lbah = cdb[11]; 2811 tf->flags |= ATA_TFLAG_LBA48; 2812 } else 2813 tf->flags &= ~ATA_TFLAG_LBA48; 2814 2815 /* 2816 * Always copy low byte, device and command registers. 2817 */ 2818 tf->feature = cdb[4]; 2819 tf->nsect = cdb[6]; 2820 tf->lbal = cdb[8]; 2821 tf->lbam = cdb[10]; 2822 tf->lbah = cdb[12]; 2823 tf->device = cdb[13]; 2824 tf->command = cdb[14]; 2825 } else { 2826 /* 2827 * 12-byte CDB - incapable of extended commands. 2828 */ 2829 tf->flags &= ~ATA_TFLAG_LBA48; 2830 2831 tf->feature = cdb[3]; 2832 tf->nsect = cdb[4]; 2833 tf->lbal = cdb[5]; 2834 tf->lbam = cdb[6]; 2835 tf->lbah = cdb[7]; 2836 tf->device = cdb[8]; 2837 tf->command = cdb[9]; 2838 } 2839 2840 /* enforce correct master/slave bit */ 2841 tf->device = dev->devno ? 2842 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2843 2844 /* sanity check for pio multi commands */ 2845 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2846 goto invalid_fld; 2847 2848 if (is_multi_taskfile(tf)) { 2849 unsigned int multi_count = 1 << (cdb[1] >> 5); 2850 2851 /* compare the passed through multi_count 2852 * with the cached multi_count of libata 2853 */ 2854 if (multi_count != dev->multi_count) 2855 ata_dev_printk(dev, KERN_WARNING, 2856 "invalid multi_count %u ignored\n", 2857 multi_count); 2858 } 2859 2860 /* READ/WRITE LONG use a non-standard sect_size */ 2861 qc->sect_size = ATA_SECT_SIZE; 2862 switch (tf->command) { 2863 case ATA_CMD_READ_LONG: 2864 case ATA_CMD_READ_LONG_ONCE: 2865 case ATA_CMD_WRITE_LONG: 2866 case ATA_CMD_WRITE_LONG_ONCE: 2867 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2868 goto invalid_fld; 2869 qc->sect_size = scsi_bufflen(scmd); 2870 } 2871 2872 /* 2873 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2874 * SET_FEATURES - XFER MODE must be preceded/succeeded 2875 * by an update to hardware-specific registers for each 2876 * controller (i.e. the reason for ->set_piomode(), 2877 * ->set_dmamode(), and ->post_set_mode() hooks). 2878 */ 2879 if ((tf->command == ATA_CMD_SET_FEATURES) 2880 && (tf->feature == SETFEATURES_XFER)) 2881 goto invalid_fld; 2882 2883 /* 2884 * Set flags so that all registers will be written, 2885 * and pass on write indication (used for PIO/DMA 2886 * setup.) 2887 */ 2888 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2889 2890 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2891 tf->flags |= ATA_TFLAG_WRITE; 2892 2893 /* 2894 * Set transfer length. 2895 * 2896 * TODO: find out if we need to do more here to 2897 * cover scatter/gather case. 2898 */ 2899 ata_qc_set_pc_nbytes(qc); 2900 2901 /* request result TF and be quiet about device error */ 2902 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2903 2904 return 0; 2905 2906 invalid_fld: 2907 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2908 /* "Invalid field in cdb" */ 2909 return 1; 2910 } 2911 2912 /** 2913 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2914 * @dev: ATA device 2915 * @cmd: SCSI command opcode to consider 2916 * 2917 * Look up the SCSI command given, and determine whether the 2918 * SCSI command is to be translated or simulated. 2919 * 2920 * RETURNS: 2921 * Pointer to translation function if possible, %NULL if not. 2922 */ 2923 2924 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2925 { 2926 switch (cmd) { 2927 case READ_6: 2928 case READ_10: 2929 case READ_16: 2930 2931 case WRITE_6: 2932 case WRITE_10: 2933 case WRITE_16: 2934 return ata_scsi_rw_xlat; 2935 2936 case SYNCHRONIZE_CACHE: 2937 if (ata_try_flush_cache(dev)) 2938 return ata_scsi_flush_xlat; 2939 break; 2940 2941 case VERIFY: 2942 case VERIFY_16: 2943 return ata_scsi_verify_xlat; 2944 2945 case ATA_12: 2946 case ATA_16: 2947 return ata_scsi_pass_thru; 2948 2949 case START_STOP: 2950 return ata_scsi_start_stop_xlat; 2951 } 2952 2953 return NULL; 2954 } 2955 2956 /** 2957 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2958 * @ap: ATA port to which the command was being sent 2959 * @cmd: SCSI command to dump 2960 * 2961 * Prints the contents of a SCSI command via printk(). 2962 */ 2963 2964 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2965 struct scsi_cmnd *cmd) 2966 { 2967 #ifdef ATA_DEBUG 2968 struct scsi_device *scsidev = cmd->device; 2969 u8 *scsicmd = cmd->cmnd; 2970 2971 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2972 ap->print_id, 2973 scsidev->channel, scsidev->id, scsidev->lun, 2974 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2975 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2976 scsicmd[8]); 2977 #endif 2978 } 2979 2980 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 2981 void (*done)(struct scsi_cmnd *), 2982 struct ata_device *dev) 2983 { 2984 u8 scsi_op = scmd->cmnd[0]; 2985 ata_xlat_func_t xlat_func; 2986 int rc = 0; 2987 2988 if (dev->class == ATA_DEV_ATA) { 2989 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 2990 goto bad_cdb_len; 2991 2992 xlat_func = ata_get_xlat_func(dev, scsi_op); 2993 } else { 2994 if (unlikely(!scmd->cmd_len)) 2995 goto bad_cdb_len; 2996 2997 xlat_func = NULL; 2998 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 2999 /* relay SCSI command to ATAPI device */ 3000 int len = COMMAND_SIZE(scsi_op); 3001 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3002 goto bad_cdb_len; 3003 3004 xlat_func = atapi_xlat; 3005 } else { 3006 /* ATA_16 passthru, treat as an ATA command */ 3007 if (unlikely(scmd->cmd_len > 16)) 3008 goto bad_cdb_len; 3009 3010 xlat_func = ata_get_xlat_func(dev, scsi_op); 3011 } 3012 } 3013 3014 if (xlat_func) 3015 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3016 else 3017 ata_scsi_simulate(dev, scmd, done); 3018 3019 return rc; 3020 3021 bad_cdb_len: 3022 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3023 scmd->cmd_len, scsi_op, dev->cdb_len); 3024 scmd->result = DID_ERROR << 16; 3025 done(scmd); 3026 return 0; 3027 } 3028 3029 /** 3030 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3031 * @cmd: SCSI command to be sent 3032 * @done: Completion function, called when command is complete 3033 * 3034 * In some cases, this function translates SCSI commands into 3035 * ATA taskfiles, and queues the taskfiles to be sent to 3036 * hardware. In other cases, this function simulates a 3037 * SCSI device by evaluating and responding to certain 3038 * SCSI commands. This creates the overall effect of 3039 * ATA and ATAPI devices appearing as SCSI devices. 3040 * 3041 * LOCKING: 3042 * Releases scsi-layer-held lock, and obtains host lock. 3043 * 3044 * RETURNS: 3045 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3046 * 0 otherwise. 3047 */ 3048 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3049 { 3050 struct ata_port *ap; 3051 struct ata_device *dev; 3052 struct scsi_device *scsidev = cmd->device; 3053 struct Scsi_Host *shost = scsidev->host; 3054 int rc = 0; 3055 3056 ap = ata_shost_to_port(shost); 3057 3058 spin_unlock(shost->host_lock); 3059 spin_lock(ap->lock); 3060 3061 ata_scsi_dump_cdb(ap, cmd); 3062 3063 dev = ata_scsi_find_dev(ap, scsidev); 3064 if (likely(dev)) 3065 rc = __ata_scsi_queuecmd(cmd, done, dev); 3066 else { 3067 cmd->result = (DID_BAD_TARGET << 16); 3068 done(cmd); 3069 } 3070 3071 spin_unlock(ap->lock); 3072 spin_lock(shost->host_lock); 3073 return rc; 3074 } 3075 3076 /** 3077 * ata_scsi_simulate - simulate SCSI command on ATA device 3078 * @dev: the target device 3079 * @cmd: SCSI command being sent to device. 3080 * @done: SCSI command completion function. 3081 * 3082 * Interprets and directly executes a select list of SCSI commands 3083 * that can be handled internally. 3084 * 3085 * LOCKING: 3086 * spin_lock_irqsave(host lock) 3087 */ 3088 3089 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3090 void (*done)(struct scsi_cmnd *)) 3091 { 3092 struct ata_scsi_args args; 3093 const u8 *scsicmd = cmd->cmnd; 3094 u8 tmp8; 3095 3096 args.dev = dev; 3097 args.id = dev->id; 3098 args.cmd = cmd; 3099 args.done = done; 3100 3101 switch(scsicmd[0]) { 3102 /* TODO: worth improving? */ 3103 case FORMAT_UNIT: 3104 ata_scsi_invalid_field(cmd, done); 3105 break; 3106 3107 case INQUIRY: 3108 if (scsicmd[1] & 2) /* is CmdDt set? */ 3109 ata_scsi_invalid_field(cmd, done); 3110 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3111 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3112 else switch (scsicmd[2]) { 3113 case 0x00: 3114 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3115 break; 3116 case 0x80: 3117 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3118 break; 3119 case 0x83: 3120 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3121 break; 3122 case 0x89: 3123 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3124 break; 3125 case 0xb1: 3126 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3127 break; 3128 default: 3129 ata_scsi_invalid_field(cmd, done); 3130 break; 3131 } 3132 break; 3133 3134 case MODE_SENSE: 3135 case MODE_SENSE_10: 3136 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3137 break; 3138 3139 case MODE_SELECT: /* unconditionally return */ 3140 case MODE_SELECT_10: /* bad-field-in-cdb */ 3141 ata_scsi_invalid_field(cmd, done); 3142 break; 3143 3144 case READ_CAPACITY: 3145 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3146 break; 3147 3148 case SERVICE_ACTION_IN: 3149 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3150 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3151 else 3152 ata_scsi_invalid_field(cmd, done); 3153 break; 3154 3155 case REPORT_LUNS: 3156 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3157 break; 3158 3159 case REQUEST_SENSE: 3160 ata_scsi_set_sense(cmd, 0, 0, 0); 3161 cmd->result = (DRIVER_SENSE << 24); 3162 done(cmd); 3163 break; 3164 3165 /* if we reach this, then writeback caching is disabled, 3166 * turning this into a no-op. 3167 */ 3168 case SYNCHRONIZE_CACHE: 3169 /* fall through */ 3170 3171 /* no-op's, complete with success */ 3172 case REZERO_UNIT: 3173 case SEEK_6: 3174 case SEEK_10: 3175 case TEST_UNIT_READY: 3176 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3177 break; 3178 3179 case SEND_DIAGNOSTIC: 3180 tmp8 = scsicmd[1] & ~(1 << 3); 3181 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3182 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3183 else 3184 ata_scsi_invalid_field(cmd, done); 3185 break; 3186 3187 /* all other commands */ 3188 default: 3189 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3190 /* "Invalid command operation code" */ 3191 done(cmd); 3192 break; 3193 } 3194 } 3195 3196 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3197 { 3198 int i, rc; 3199 3200 for (i = 0; i < host->n_ports; i++) { 3201 struct ata_port *ap = host->ports[i]; 3202 struct Scsi_Host *shost; 3203 3204 rc = -ENOMEM; 3205 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3206 if (!shost) 3207 goto err_alloc; 3208 3209 *(struct ata_port **)&shost->hostdata[0] = ap; 3210 ap->scsi_host = shost; 3211 3212 shost->transportt = &ata_scsi_transport_template; 3213 shost->unique_id = ap->print_id; 3214 shost->max_id = 16; 3215 shost->max_lun = 1; 3216 shost->max_channel = 1; 3217 shost->max_cmd_len = 16; 3218 3219 /* Schedule policy is determined by ->qc_defer() 3220 * callback and it needs to see every deferred qc. 3221 * Set host_blocked to 1 to prevent SCSI midlayer from 3222 * automatically deferring requests. 3223 */ 3224 shost->max_host_blocked = 1; 3225 3226 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3227 if (rc) 3228 goto err_add; 3229 } 3230 3231 return 0; 3232 3233 err_add: 3234 scsi_host_put(host->ports[i]->scsi_host); 3235 err_alloc: 3236 while (--i >= 0) { 3237 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3238 3239 scsi_remove_host(shost); 3240 scsi_host_put(shost); 3241 } 3242 return rc; 3243 } 3244 3245 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3246 { 3247 int tries = 5; 3248 struct ata_device *last_failed_dev = NULL; 3249 struct ata_link *link; 3250 struct ata_device *dev; 3251 3252 if (ap->flags & ATA_FLAG_DISABLED) 3253 return; 3254 3255 repeat: 3256 ata_for_each_link(link, ap, EDGE) { 3257 ata_for_each_dev(dev, link, ENABLED) { 3258 struct scsi_device *sdev; 3259 int channel = 0, id = 0; 3260 3261 if (dev->sdev) 3262 continue; 3263 3264 if (ata_is_host_link(link)) 3265 id = dev->devno; 3266 else 3267 channel = link->pmp; 3268 3269 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3270 NULL); 3271 if (!IS_ERR(sdev)) { 3272 dev->sdev = sdev; 3273 scsi_device_put(sdev); 3274 } 3275 } 3276 } 3277 3278 /* If we scanned while EH was in progress or allocation 3279 * failure occurred, scan would have failed silently. Check 3280 * whether all devices are attached. 3281 */ 3282 ata_for_each_link(link, ap, EDGE) { 3283 ata_for_each_dev(dev, link, ENABLED) { 3284 if (!dev->sdev) 3285 goto exit_loop; 3286 } 3287 } 3288 exit_loop: 3289 if (!link) 3290 return; 3291 3292 /* we're missing some SCSI devices */ 3293 if (sync) { 3294 /* If caller requested synchrnous scan && we've made 3295 * any progress, sleep briefly and repeat. 3296 */ 3297 if (dev != last_failed_dev) { 3298 msleep(100); 3299 last_failed_dev = dev; 3300 goto repeat; 3301 } 3302 3303 /* We might be failing to detect boot device, give it 3304 * a few more chances. 3305 */ 3306 if (--tries) { 3307 msleep(100); 3308 goto repeat; 3309 } 3310 3311 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3312 "failed without making any progress,\n" 3313 " switching to async\n"); 3314 } 3315 3316 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3317 round_jiffies_relative(HZ)); 3318 } 3319 3320 /** 3321 * ata_scsi_offline_dev - offline attached SCSI device 3322 * @dev: ATA device to offline attached SCSI device for 3323 * 3324 * This function is called from ata_eh_hotplug() and responsible 3325 * for taking the SCSI device attached to @dev offline. This 3326 * function is called with host lock which protects dev->sdev 3327 * against clearing. 3328 * 3329 * LOCKING: 3330 * spin_lock_irqsave(host lock) 3331 * 3332 * RETURNS: 3333 * 1 if attached SCSI device exists, 0 otherwise. 3334 */ 3335 int ata_scsi_offline_dev(struct ata_device *dev) 3336 { 3337 if (dev->sdev) { 3338 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3339 return 1; 3340 } 3341 return 0; 3342 } 3343 3344 /** 3345 * ata_scsi_remove_dev - remove attached SCSI device 3346 * @dev: ATA device to remove attached SCSI device for 3347 * 3348 * This function is called from ata_eh_scsi_hotplug() and 3349 * responsible for removing the SCSI device attached to @dev. 3350 * 3351 * LOCKING: 3352 * Kernel thread context (may sleep). 3353 */ 3354 static void ata_scsi_remove_dev(struct ata_device *dev) 3355 { 3356 struct ata_port *ap = dev->link->ap; 3357 struct scsi_device *sdev; 3358 unsigned long flags; 3359 3360 /* Alas, we need to grab scan_mutex to ensure SCSI device 3361 * state doesn't change underneath us and thus 3362 * scsi_device_get() always succeeds. The mutex locking can 3363 * be removed if there is __scsi_device_get() interface which 3364 * increments reference counts regardless of device state. 3365 */ 3366 mutex_lock(&ap->scsi_host->scan_mutex); 3367 spin_lock_irqsave(ap->lock, flags); 3368 3369 /* clearing dev->sdev is protected by host lock */ 3370 sdev = dev->sdev; 3371 dev->sdev = NULL; 3372 3373 if (sdev) { 3374 /* If user initiated unplug races with us, sdev can go 3375 * away underneath us after the host lock and 3376 * scan_mutex are released. Hold onto it. 3377 */ 3378 if (scsi_device_get(sdev) == 0) { 3379 /* The following ensures the attached sdev is 3380 * offline on return from ata_scsi_offline_dev() 3381 * regardless it wins or loses the race 3382 * against this function. 3383 */ 3384 scsi_device_set_state(sdev, SDEV_OFFLINE); 3385 } else { 3386 WARN_ON(1); 3387 sdev = NULL; 3388 } 3389 } 3390 3391 spin_unlock_irqrestore(ap->lock, flags); 3392 mutex_unlock(&ap->scsi_host->scan_mutex); 3393 3394 if (sdev) { 3395 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3396 dev_name(&sdev->sdev_gendev)); 3397 3398 scsi_remove_device(sdev); 3399 scsi_device_put(sdev); 3400 } 3401 } 3402 3403 static void ata_scsi_handle_link_detach(struct ata_link *link) 3404 { 3405 struct ata_port *ap = link->ap; 3406 struct ata_device *dev; 3407 3408 ata_for_each_dev(dev, link, ALL) { 3409 unsigned long flags; 3410 3411 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3412 continue; 3413 3414 spin_lock_irqsave(ap->lock, flags); 3415 dev->flags &= ~ATA_DFLAG_DETACHED; 3416 spin_unlock_irqrestore(ap->lock, flags); 3417 3418 ata_scsi_remove_dev(dev); 3419 } 3420 } 3421 3422 /** 3423 * ata_scsi_media_change_notify - send media change event 3424 * @dev: Pointer to the disk device with media change event 3425 * 3426 * Tell the block layer to send a media change notification 3427 * event. 3428 * 3429 * LOCKING: 3430 * spin_lock_irqsave(host lock) 3431 */ 3432 void ata_scsi_media_change_notify(struct ata_device *dev) 3433 { 3434 if (dev->sdev) 3435 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3436 GFP_ATOMIC); 3437 } 3438 3439 /** 3440 * ata_scsi_hotplug - SCSI part of hotplug 3441 * @work: Pointer to ATA port to perform SCSI hotplug on 3442 * 3443 * Perform SCSI part of hotplug. It's executed from a separate 3444 * workqueue after EH completes. This is necessary because SCSI 3445 * hot plugging requires working EH and hot unplugging is 3446 * synchronized with hot plugging with a mutex. 3447 * 3448 * LOCKING: 3449 * Kernel thread context (may sleep). 3450 */ 3451 void ata_scsi_hotplug(struct work_struct *work) 3452 { 3453 struct ata_port *ap = 3454 container_of(work, struct ata_port, hotplug_task.work); 3455 int i; 3456 3457 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3458 DPRINTK("ENTER/EXIT - unloading\n"); 3459 return; 3460 } 3461 3462 DPRINTK("ENTER\n"); 3463 3464 /* Unplug detached devices. We cannot use link iterator here 3465 * because PMP links have to be scanned even if PMP is 3466 * currently not attached. Iterate manually. 3467 */ 3468 ata_scsi_handle_link_detach(&ap->link); 3469 if (ap->pmp_link) 3470 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3471 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3472 3473 /* scan for new ones */ 3474 ata_scsi_scan_host(ap, 0); 3475 3476 DPRINTK("EXIT\n"); 3477 } 3478 3479 /** 3480 * ata_scsi_user_scan - indication for user-initiated bus scan 3481 * @shost: SCSI host to scan 3482 * @channel: Channel to scan 3483 * @id: ID to scan 3484 * @lun: LUN to scan 3485 * 3486 * This function is called when user explicitly requests bus 3487 * scan. Set probe pending flag and invoke EH. 3488 * 3489 * LOCKING: 3490 * SCSI layer (we don't care) 3491 * 3492 * RETURNS: 3493 * Zero. 3494 */ 3495 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3496 unsigned int id, unsigned int lun) 3497 { 3498 struct ata_port *ap = ata_shost_to_port(shost); 3499 unsigned long flags; 3500 int devno, rc = 0; 3501 3502 if (!ap->ops->error_handler) 3503 return -EOPNOTSUPP; 3504 3505 if (lun != SCAN_WILD_CARD && lun) 3506 return -EINVAL; 3507 3508 if (!sata_pmp_attached(ap)) { 3509 if (channel != SCAN_WILD_CARD && channel) 3510 return -EINVAL; 3511 devno = id; 3512 } else { 3513 if (id != SCAN_WILD_CARD && id) 3514 return -EINVAL; 3515 devno = channel; 3516 } 3517 3518 spin_lock_irqsave(ap->lock, flags); 3519 3520 if (devno == SCAN_WILD_CARD) { 3521 struct ata_link *link; 3522 3523 ata_for_each_link(link, ap, EDGE) { 3524 struct ata_eh_info *ehi = &link->eh_info; 3525 ehi->probe_mask |= ATA_ALL_DEVICES; 3526 ehi->action |= ATA_EH_RESET; 3527 } 3528 } else { 3529 struct ata_device *dev = ata_find_dev(ap, devno); 3530 3531 if (dev) { 3532 struct ata_eh_info *ehi = &dev->link->eh_info; 3533 ehi->probe_mask |= 1 << dev->devno; 3534 ehi->action |= ATA_EH_RESET; 3535 } else 3536 rc = -EINVAL; 3537 } 3538 3539 if (rc == 0) { 3540 ata_port_schedule_eh(ap); 3541 spin_unlock_irqrestore(ap->lock, flags); 3542 ata_port_wait_eh(ap); 3543 } else 3544 spin_unlock_irqrestore(ap->lock, flags); 3545 3546 return rc; 3547 } 3548 3549 /** 3550 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3551 * @work: Pointer to ATA port to perform scsi_rescan_device() 3552 * 3553 * After ATA pass thru (SAT) commands are executed successfully, 3554 * libata need to propagate the changes to SCSI layer. This 3555 * function must be executed from ata_aux_wq such that sdev 3556 * attach/detach don't race with rescan. 3557 * 3558 * LOCKING: 3559 * Kernel thread context (may sleep). 3560 */ 3561 void ata_scsi_dev_rescan(struct work_struct *work) 3562 { 3563 struct ata_port *ap = 3564 container_of(work, struct ata_port, scsi_rescan_task); 3565 struct ata_link *link; 3566 struct ata_device *dev; 3567 unsigned long flags; 3568 3569 spin_lock_irqsave(ap->lock, flags); 3570 3571 ata_for_each_link(link, ap, EDGE) { 3572 ata_for_each_dev(dev, link, ENABLED) { 3573 struct scsi_device *sdev = dev->sdev; 3574 3575 if (!sdev) 3576 continue; 3577 if (scsi_device_get(sdev)) 3578 continue; 3579 3580 spin_unlock_irqrestore(ap->lock, flags); 3581 scsi_rescan_device(&(sdev->sdev_gendev)); 3582 scsi_device_put(sdev); 3583 spin_lock_irqsave(ap->lock, flags); 3584 } 3585 } 3586 3587 spin_unlock_irqrestore(ap->lock, flags); 3588 } 3589 3590 /** 3591 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3592 * @host: ATA host container for all SAS ports 3593 * @port_info: Information from low-level host driver 3594 * @shost: SCSI host that the scsi device is attached to 3595 * 3596 * LOCKING: 3597 * PCI/etc. bus probe sem. 3598 * 3599 * RETURNS: 3600 * ata_port pointer on success / NULL on failure. 3601 */ 3602 3603 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3604 struct ata_port_info *port_info, 3605 struct Scsi_Host *shost) 3606 { 3607 struct ata_port *ap; 3608 3609 ap = ata_port_alloc(host); 3610 if (!ap) 3611 return NULL; 3612 3613 ap->port_no = 0; 3614 ap->lock = shost->host_lock; 3615 ap->pio_mask = port_info->pio_mask; 3616 ap->mwdma_mask = port_info->mwdma_mask; 3617 ap->udma_mask = port_info->udma_mask; 3618 ap->flags |= port_info->flags; 3619 ap->ops = port_info->port_ops; 3620 ap->cbl = ATA_CBL_SATA; 3621 3622 return ap; 3623 } 3624 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3625 3626 /** 3627 * ata_sas_port_start - Set port up for dma. 3628 * @ap: Port to initialize 3629 * 3630 * Called just after data structures for each port are 3631 * initialized. 3632 * 3633 * May be used as the port_start() entry in ata_port_operations. 3634 * 3635 * LOCKING: 3636 * Inherited from caller. 3637 */ 3638 int ata_sas_port_start(struct ata_port *ap) 3639 { 3640 return 0; 3641 } 3642 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3643 3644 /** 3645 * ata_port_stop - Undo ata_sas_port_start() 3646 * @ap: Port to shut down 3647 * 3648 * May be used as the port_stop() entry in ata_port_operations. 3649 * 3650 * LOCKING: 3651 * Inherited from caller. 3652 */ 3653 3654 void ata_sas_port_stop(struct ata_port *ap) 3655 { 3656 } 3657 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3658 3659 /** 3660 * ata_sas_port_init - Initialize a SATA device 3661 * @ap: SATA port to initialize 3662 * 3663 * LOCKING: 3664 * PCI/etc. bus probe sem. 3665 * 3666 * RETURNS: 3667 * Zero on success, non-zero on error. 3668 */ 3669 3670 int ata_sas_port_init(struct ata_port *ap) 3671 { 3672 int rc = ap->ops->port_start(ap); 3673 3674 if (!rc) { 3675 ap->print_id = ata_print_id++; 3676 rc = ata_bus_probe(ap); 3677 } 3678 3679 return rc; 3680 } 3681 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3682 3683 /** 3684 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3685 * @ap: SATA port to destroy 3686 * 3687 */ 3688 3689 void ata_sas_port_destroy(struct ata_port *ap) 3690 { 3691 if (ap->ops->port_stop) 3692 ap->ops->port_stop(ap); 3693 kfree(ap); 3694 } 3695 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3696 3697 /** 3698 * ata_sas_slave_configure - Default slave_config routine for libata devices 3699 * @sdev: SCSI device to configure 3700 * @ap: ATA port to which SCSI device is attached 3701 * 3702 * RETURNS: 3703 * Zero. 3704 */ 3705 3706 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3707 { 3708 ata_scsi_sdev_config(sdev); 3709 ata_scsi_dev_config(sdev, ap->link.device); 3710 return 0; 3711 } 3712 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3713 3714 /** 3715 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3716 * @cmd: SCSI command to be sent 3717 * @done: Completion function, called when command is complete 3718 * @ap: ATA port to which the command is being sent 3719 * 3720 * RETURNS: 3721 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3722 * 0 otherwise. 3723 */ 3724 3725 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3726 struct ata_port *ap) 3727 { 3728 int rc = 0; 3729 3730 ata_scsi_dump_cdb(ap, cmd); 3731 3732 if (likely(ata_dev_enabled(ap->link.device))) 3733 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3734 else { 3735 cmd->result = (DID_BAD_TARGET << 16); 3736 done(cmd); 3737 } 3738 return rc; 3739 } 3740 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3741