1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/blkdev.h> 38 #include <linux/spinlock.h> 39 #include <scsi/scsi.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_cmnd.h> 42 #include <scsi/scsi_eh.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_tcq.h> 45 #include <scsi/scsi_transport.h> 46 #include <linux/libata.h> 47 #include <linux/hdreg.h> 48 #include <linux/uaccess.h> 49 #include <linux/suspend.h> 50 51 #include "libata.h" 52 53 #define SECTOR_SIZE 512 54 #define ATA_SCSI_RBUF_SIZE 4096 55 56 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 57 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 58 59 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 60 61 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 62 const struct scsi_device *scsidev); 63 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 64 const struct scsi_device *scsidev); 65 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 66 unsigned int id, unsigned int lun); 67 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 /* 108 * libata transport template. libata doesn't do real transport stuff. 109 * It just needs the eh_timed_out hook. 110 */ 111 static struct scsi_transport_template ata_scsi_transport_template = { 112 .eh_strategy_handler = ata_scsi_error, 113 .eh_timed_out = ata_scsi_timed_out, 114 .user_scan = ata_scsi_user_scan, 115 }; 116 117 118 static const struct { 119 enum link_pm value; 120 const char *name; 121 } link_pm_policy[] = { 122 { NOT_AVAILABLE, "max_performance" }, 123 { MIN_POWER, "min_power" }, 124 { MAX_PERFORMANCE, "max_performance" }, 125 { MEDIUM_POWER, "medium_power" }, 126 }; 127 128 static const char *ata_scsi_lpm_get(enum link_pm policy) 129 { 130 int i; 131 132 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++) 133 if (link_pm_policy[i].value == policy) 134 return link_pm_policy[i].name; 135 136 return NULL; 137 } 138 139 static ssize_t ata_scsi_lpm_put(struct device *dev, 140 struct device_attribute *attr, 141 const char *buf, size_t count) 142 { 143 struct Scsi_Host *shost = class_to_shost(dev); 144 struct ata_port *ap = ata_shost_to_port(shost); 145 enum link_pm policy = 0; 146 int i; 147 148 /* 149 * we are skipping array location 0 on purpose - this 150 * is because a value of NOT_AVAILABLE is displayed 151 * to the user as max_performance, but when the user 152 * writes "max_performance", they actually want the 153 * value to match MAX_PERFORMANCE. 154 */ 155 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) { 156 const int len = strlen(link_pm_policy[i].name); 157 if (strncmp(link_pm_policy[i].name, buf, len) == 0 && 158 buf[len] == '\n') { 159 policy = link_pm_policy[i].value; 160 break; 161 } 162 } 163 if (!policy) 164 return -EINVAL; 165 166 ata_lpm_schedule(ap, policy); 167 return count; 168 } 169 170 static ssize_t 171 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf) 172 { 173 struct Scsi_Host *shost = class_to_shost(dev); 174 struct ata_port *ap = ata_shost_to_port(shost); 175 const char *policy = 176 ata_scsi_lpm_get(ap->pm_policy); 177 178 if (!policy) 179 return -EINVAL; 180 181 return snprintf(buf, 23, "%s\n", policy); 182 } 183 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 184 ata_scsi_lpm_show, ata_scsi_lpm_put); 185 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 186 187 static ssize_t ata_scsi_park_show(struct device *device, 188 struct device_attribute *attr, char *buf) 189 { 190 struct scsi_device *sdev = to_scsi_device(device); 191 struct ata_port *ap; 192 struct ata_link *link; 193 struct ata_device *dev; 194 unsigned long flags, now; 195 unsigned int uninitialized_var(msecs); 196 int rc = 0; 197 198 ap = ata_shost_to_port(sdev->host); 199 200 spin_lock_irqsave(ap->lock, flags); 201 dev = ata_scsi_find_dev(ap, sdev); 202 if (!dev) { 203 rc = -ENODEV; 204 goto unlock; 205 } 206 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 207 rc = -EOPNOTSUPP; 208 goto unlock; 209 } 210 211 link = dev->link; 212 now = jiffies; 213 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 214 link->eh_context.unloaded_mask & (1 << dev->devno) && 215 time_after(dev->unpark_deadline, now)) 216 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 217 else 218 msecs = 0; 219 220 unlock: 221 spin_unlock_irq(ap->lock); 222 223 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 224 } 225 226 static ssize_t ata_scsi_park_store(struct device *device, 227 struct device_attribute *attr, 228 const char *buf, size_t len) 229 { 230 struct scsi_device *sdev = to_scsi_device(device); 231 struct ata_port *ap; 232 struct ata_device *dev; 233 long int input; 234 unsigned long flags; 235 int rc; 236 237 rc = strict_strtol(buf, 10, &input); 238 if (rc || input < -2) 239 return -EINVAL; 240 if (input > ATA_TMOUT_MAX_PARK) { 241 rc = -EOVERFLOW; 242 input = ATA_TMOUT_MAX_PARK; 243 } 244 245 ap = ata_shost_to_port(sdev->host); 246 247 spin_lock_irqsave(ap->lock, flags); 248 dev = ata_scsi_find_dev(ap, sdev); 249 if (unlikely(!dev)) { 250 rc = -ENODEV; 251 goto unlock; 252 } 253 if (dev->class != ATA_DEV_ATA) { 254 rc = -EOPNOTSUPP; 255 goto unlock; 256 } 257 258 if (input >= 0) { 259 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 260 rc = -EOPNOTSUPP; 261 goto unlock; 262 } 263 264 dev->unpark_deadline = ata_deadline(jiffies, input); 265 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 266 ata_port_schedule_eh(ap); 267 complete(&ap->park_req_pending); 268 } else { 269 switch (input) { 270 case -1: 271 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 272 break; 273 case -2: 274 dev->flags |= ATA_DFLAG_NO_UNLOAD; 275 break; 276 } 277 } 278 unlock: 279 spin_unlock_irqrestore(ap->lock, flags); 280 281 return rc ? rc : len; 282 } 283 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 284 ata_scsi_park_show, ata_scsi_park_store); 285 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 286 287 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 288 { 289 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 290 291 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 292 } 293 294 static ssize_t 295 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 296 const char *buf, size_t count) 297 { 298 struct Scsi_Host *shost = class_to_shost(dev); 299 struct ata_port *ap = ata_shost_to_port(shost); 300 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 301 return ap->ops->em_store(ap, buf, count); 302 return -EINVAL; 303 } 304 305 static ssize_t 306 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 307 char *buf) 308 { 309 struct Scsi_Host *shost = class_to_shost(dev); 310 struct ata_port *ap = ata_shost_to_port(shost); 311 312 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 313 return ap->ops->em_show(ap, buf); 314 return -EINVAL; 315 } 316 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 317 ata_scsi_em_message_show, ata_scsi_em_message_store); 318 EXPORT_SYMBOL_GPL(dev_attr_em_message); 319 320 static ssize_t 321 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 322 char *buf) 323 { 324 struct Scsi_Host *shost = class_to_shost(dev); 325 struct ata_port *ap = ata_shost_to_port(shost); 326 327 return snprintf(buf, 23, "%d\n", ap->em_message_type); 328 } 329 DEVICE_ATTR(em_message_type, S_IRUGO, 330 ata_scsi_em_message_type_show, NULL); 331 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 332 333 static ssize_t 334 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 335 char *buf) 336 { 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 341 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY)) 342 return ap->ops->sw_activity_show(atadev, buf); 343 return -EINVAL; 344 } 345 346 static ssize_t 347 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 348 const char *buf, size_t count) 349 { 350 struct scsi_device *sdev = to_scsi_device(dev); 351 struct ata_port *ap = ata_shost_to_port(sdev->host); 352 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 353 enum sw_activity val; 354 int rc; 355 356 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 357 val = simple_strtoul(buf, NULL, 0); 358 switch (val) { 359 case OFF: case BLINK_ON: case BLINK_OFF: 360 rc = ap->ops->sw_activity_store(atadev, val); 361 if (!rc) 362 return count; 363 else 364 return rc; 365 } 366 } 367 return -EINVAL; 368 } 369 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 370 ata_scsi_activity_store); 371 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 372 373 struct device_attribute *ata_common_sdev_attrs[] = { 374 &dev_attr_unload_heads, 375 NULL 376 }; 377 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 378 379 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 380 void (*done)(struct scsi_cmnd *)) 381 { 382 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 383 /* "Invalid field in cbd" */ 384 done(cmd); 385 } 386 387 /** 388 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 389 * @sdev: SCSI device for which BIOS geometry is to be determined 390 * @bdev: block device associated with @sdev 391 * @capacity: capacity of SCSI device 392 * @geom: location to which geometry will be output 393 * 394 * Generic bios head/sector/cylinder calculator 395 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 396 * mapping. Some situations may arise where the disk is not 397 * bootable if this is not used. 398 * 399 * LOCKING: 400 * Defined by the SCSI layer. We don't really care. 401 * 402 * RETURNS: 403 * Zero. 404 */ 405 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 406 sector_t capacity, int geom[]) 407 { 408 geom[0] = 255; 409 geom[1] = 63; 410 sector_div(capacity, 255*63); 411 geom[2] = capacity; 412 413 return 0; 414 } 415 416 /** 417 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 418 * @ap: target port 419 * @sdev: SCSI device to get identify data for 420 * @arg: User buffer area for identify data 421 * 422 * LOCKING: 423 * Defined by the SCSI layer. We don't really care. 424 * 425 * RETURNS: 426 * Zero on success, negative errno on error. 427 */ 428 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 429 void __user *arg) 430 { 431 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 432 u16 __user *dst = arg; 433 char buf[40]; 434 435 if (!dev) 436 return -ENOMSG; 437 438 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 439 return -EFAULT; 440 441 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 442 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 443 return -EFAULT; 444 445 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 446 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 447 return -EFAULT; 448 449 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 450 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 451 return -EFAULT; 452 453 return 0; 454 } 455 456 /** 457 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 458 * @scsidev: Device to which we are issuing command 459 * @arg: User provided data for issuing command 460 * 461 * LOCKING: 462 * Defined by the SCSI layer. We don't really care. 463 * 464 * RETURNS: 465 * Zero on success, negative errno on error. 466 */ 467 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 468 { 469 int rc = 0; 470 u8 scsi_cmd[MAX_COMMAND_SIZE]; 471 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 472 int argsize = 0; 473 enum dma_data_direction data_dir; 474 int cmd_result; 475 476 if (arg == NULL) 477 return -EINVAL; 478 479 if (copy_from_user(args, arg, sizeof(args))) 480 return -EFAULT; 481 482 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 483 if (!sensebuf) 484 return -ENOMEM; 485 486 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 487 488 if (args[3]) { 489 argsize = SECTOR_SIZE * args[3]; 490 argbuf = kmalloc(argsize, GFP_KERNEL); 491 if (argbuf == NULL) { 492 rc = -ENOMEM; 493 goto error; 494 } 495 496 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 497 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 498 block count in sector count field */ 499 data_dir = DMA_FROM_DEVICE; 500 } else { 501 scsi_cmd[1] = (3 << 1); /* Non-data */ 502 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 503 data_dir = DMA_NONE; 504 } 505 506 scsi_cmd[0] = ATA_16; 507 508 scsi_cmd[4] = args[2]; 509 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 510 scsi_cmd[6] = args[3]; 511 scsi_cmd[8] = args[1]; 512 scsi_cmd[10] = 0x4f; 513 scsi_cmd[12] = 0xc2; 514 } else { 515 scsi_cmd[6] = args[1]; 516 } 517 scsi_cmd[14] = args[0]; 518 519 /* Good values for timeout and retries? Values below 520 from scsi_ioctl_send_command() for default case... */ 521 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 522 sensebuf, (10*HZ), 5, 0, NULL); 523 524 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 525 u8 *desc = sensebuf + 8; 526 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 527 528 /* If we set cc then ATA pass-through will cause a 529 * check condition even if no error. Filter that. */ 530 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 531 struct scsi_sense_hdr sshdr; 532 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 533 &sshdr); 534 if (sshdr.sense_key == 0 && 535 sshdr.asc == 0 && sshdr.ascq == 0) 536 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 537 } 538 539 /* Send userspace a few ATA registers (same as drivers/ide) */ 540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 541 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 542 args[0] = desc[13]; /* status */ 543 args[1] = desc[3]; /* error */ 544 args[2] = desc[5]; /* sector count (0:7) */ 545 if (copy_to_user(arg, args, sizeof(args))) 546 rc = -EFAULT; 547 } 548 } 549 550 551 if (cmd_result) { 552 rc = -EIO; 553 goto error; 554 } 555 556 if ((argbuf) 557 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 558 rc = -EFAULT; 559 error: 560 kfree(sensebuf); 561 kfree(argbuf); 562 return rc; 563 } 564 565 /** 566 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 567 * @scsidev: Device to which we are issuing command 568 * @arg: User provided data for issuing command 569 * 570 * LOCKING: 571 * Defined by the SCSI layer. We don't really care. 572 * 573 * RETURNS: 574 * Zero on success, negative errno on error. 575 */ 576 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 577 { 578 int rc = 0; 579 u8 scsi_cmd[MAX_COMMAND_SIZE]; 580 u8 args[7], *sensebuf = NULL; 581 int cmd_result; 582 583 if (arg == NULL) 584 return -EINVAL; 585 586 if (copy_from_user(args, arg, sizeof(args))) 587 return -EFAULT; 588 589 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 590 if (!sensebuf) 591 return -ENOMEM; 592 593 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 594 scsi_cmd[0] = ATA_16; 595 scsi_cmd[1] = (3 << 1); /* Non-data */ 596 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 597 scsi_cmd[4] = args[1]; 598 scsi_cmd[6] = args[2]; 599 scsi_cmd[8] = args[3]; 600 scsi_cmd[10] = args[4]; 601 scsi_cmd[12] = args[5]; 602 scsi_cmd[13] = args[6] & 0x4f; 603 scsi_cmd[14] = args[0]; 604 605 /* Good values for timeout and retries? Values below 606 from scsi_ioctl_send_command() for default case... */ 607 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 608 sensebuf, (10*HZ), 5, 0, NULL); 609 610 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 611 u8 *desc = sensebuf + 8; 612 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 613 614 /* If we set cc then ATA pass-through will cause a 615 * check condition even if no error. Filter that. */ 616 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 617 struct scsi_sense_hdr sshdr; 618 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 619 &sshdr); 620 if (sshdr.sense_key == 0 && 621 sshdr.asc == 0 && sshdr.ascq == 0) 622 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 623 } 624 625 /* Send userspace ATA registers */ 626 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 627 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 628 args[0] = desc[13]; /* status */ 629 args[1] = desc[3]; /* error */ 630 args[2] = desc[5]; /* sector count (0:7) */ 631 args[3] = desc[7]; /* lbal */ 632 args[4] = desc[9]; /* lbam */ 633 args[5] = desc[11]; /* lbah */ 634 args[6] = desc[12]; /* select */ 635 if (copy_to_user(arg, args, sizeof(args))) 636 rc = -EFAULT; 637 } 638 } 639 640 if (cmd_result) { 641 rc = -EIO; 642 goto error; 643 } 644 645 error: 646 kfree(sensebuf); 647 return rc; 648 } 649 650 static int ata_ioc32(struct ata_port *ap) 651 { 652 if (ap->flags & ATA_FLAG_PIO_DMA) 653 return 1; 654 if (ap->pflags & ATA_PFLAG_PIO32) 655 return 1; 656 return 0; 657 } 658 659 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 660 int cmd, void __user *arg) 661 { 662 int val = -EINVAL, rc = -EINVAL; 663 unsigned long flags; 664 665 switch (cmd) { 666 case ATA_IOC_GET_IO32: 667 spin_lock_irqsave(ap->lock, flags); 668 val = ata_ioc32(ap); 669 spin_unlock_irqrestore(ap->lock, flags); 670 if (copy_to_user(arg, &val, 1)) 671 return -EFAULT; 672 return 0; 673 674 case ATA_IOC_SET_IO32: 675 val = (unsigned long) arg; 676 rc = 0; 677 spin_lock_irqsave(ap->lock, flags); 678 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 679 if (val) 680 ap->pflags |= ATA_PFLAG_PIO32; 681 else 682 ap->pflags &= ~ATA_PFLAG_PIO32; 683 } else { 684 if (val != ata_ioc32(ap)) 685 rc = -EINVAL; 686 } 687 spin_unlock_irqrestore(ap->lock, flags); 688 return rc; 689 690 case HDIO_GET_IDENTITY: 691 return ata_get_identity(ap, scsidev, arg); 692 693 case HDIO_DRIVE_CMD: 694 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 695 return -EACCES; 696 return ata_cmd_ioctl(scsidev, arg); 697 698 case HDIO_DRIVE_TASK: 699 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 700 return -EACCES; 701 return ata_task_ioctl(scsidev, arg); 702 703 default: 704 rc = -ENOTTY; 705 break; 706 } 707 708 return rc; 709 } 710 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 711 712 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 713 { 714 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 715 scsidev, cmd, arg); 716 } 717 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 718 719 /** 720 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 721 * @dev: ATA device to which the new command is attached 722 * @cmd: SCSI command that originated this ATA command 723 * @done: SCSI command completion function 724 * 725 * Obtain a reference to an unused ata_queued_cmd structure, 726 * which is the basic libata structure representing a single 727 * ATA command sent to the hardware. 728 * 729 * If a command was available, fill in the SCSI-specific 730 * portions of the structure with information on the 731 * current command. 732 * 733 * LOCKING: 734 * spin_lock_irqsave(host lock) 735 * 736 * RETURNS: 737 * Command allocated, or %NULL if none available. 738 */ 739 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 740 struct scsi_cmnd *cmd, 741 void (*done)(struct scsi_cmnd *)) 742 { 743 struct ata_queued_cmd *qc; 744 745 qc = ata_qc_new_init(dev); 746 if (qc) { 747 qc->scsicmd = cmd; 748 qc->scsidone = done; 749 750 qc->sg = scsi_sglist(cmd); 751 qc->n_elem = scsi_sg_count(cmd); 752 } else { 753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 754 done(cmd); 755 } 756 757 return qc; 758 } 759 760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 761 { 762 struct scsi_cmnd *scmd = qc->scsicmd; 763 764 qc->extrabytes = scmd->request->extra_len; 765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 766 } 767 768 /** 769 * ata_dump_status - user friendly display of error info 770 * @id: id of the port in question 771 * @tf: ptr to filled out taskfile 772 * 773 * Decode and dump the ATA error/status registers for the user so 774 * that they have some idea what really happened at the non 775 * make-believe layer. 776 * 777 * LOCKING: 778 * inherited from caller 779 */ 780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 781 { 782 u8 stat = tf->command, err = tf->feature; 783 784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 785 if (stat & ATA_BUSY) { 786 printk("Busy }\n"); /* Data is not valid in this case */ 787 } else { 788 if (stat & 0x40) printk("DriveReady "); 789 if (stat & 0x20) printk("DeviceFault "); 790 if (stat & 0x10) printk("SeekComplete "); 791 if (stat & 0x08) printk("DataRequest "); 792 if (stat & 0x04) printk("CorrectedError "); 793 if (stat & 0x02) printk("Index "); 794 if (stat & 0x01) printk("Error "); 795 printk("}\n"); 796 797 if (err) { 798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 799 if (err & 0x04) printk("DriveStatusError "); 800 if (err & 0x80) { 801 if (err & 0x04) printk("BadCRC "); 802 else printk("Sector "); 803 } 804 if (err & 0x40) printk("UncorrectableError "); 805 if (err & 0x10) printk("SectorIdNotFound "); 806 if (err & 0x02) printk("TrackZeroNotFound "); 807 if (err & 0x01) printk("AddrMarkNotFound "); 808 printk("}\n"); 809 } 810 } 811 } 812 813 /** 814 * ata_to_sense_error - convert ATA error to SCSI error 815 * @id: ATA device number 816 * @drv_stat: value contained in ATA status register 817 * @drv_err: value contained in ATA error register 818 * @sk: the sense key we'll fill out 819 * @asc: the additional sense code we'll fill out 820 * @ascq: the additional sense code qualifier we'll fill out 821 * @verbose: be verbose 822 * 823 * Converts an ATA error into a SCSI error. Fill out pointers to 824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 825 * format sense blocks. 826 * 827 * LOCKING: 828 * spin_lock_irqsave(host lock) 829 */ 830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 831 u8 *asc, u8 *ascq, int verbose) 832 { 833 int i; 834 835 /* Based on the 3ware driver translation table */ 836 static const unsigned char sense_table[][4] = { 837 /* BBD|ECC|ID|MAR */ 838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 839 /* BBD|ECC|ID */ 840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 841 /* ECC|MC|MARK */ 842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 845 /* MC|ID|ABRT|TRK0|MARK */ 846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 847 /* MCR|MARK */ 848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 849 /* Bad address mark */ 850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 851 /* TRK0 */ 852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 853 /* Abort & !ICRC */ 854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 855 /* Media change request */ 856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 857 /* SRV */ 858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 859 /* Media change */ 860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 861 /* ECC */ 862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 863 /* BBD - block marked bad */ 864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 866 }; 867 static const unsigned char stat_table[][4] = { 868 /* Must be first because BUSY means no other bits valid */ 869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 870 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 874 }; 875 876 /* 877 * Is this an error we can process/parse 878 */ 879 if (drv_stat & ATA_BUSY) { 880 drv_err = 0; /* Ignore the err bits, they're invalid */ 881 } 882 883 if (drv_err) { 884 /* Look for drv_err */ 885 for (i = 0; sense_table[i][0] != 0xFF; i++) { 886 /* Look for best matches first */ 887 if ((sense_table[i][0] & drv_err) == 888 sense_table[i][0]) { 889 *sk = sense_table[i][1]; 890 *asc = sense_table[i][2]; 891 *ascq = sense_table[i][3]; 892 goto translate_done; 893 } 894 } 895 /* No immediate match */ 896 if (verbose) 897 printk(KERN_WARNING "ata%u: no sense translation for " 898 "error 0x%02x\n", id, drv_err); 899 } 900 901 /* Fall back to interpreting status bits */ 902 for (i = 0; stat_table[i][0] != 0xFF; i++) { 903 if (stat_table[i][0] & drv_stat) { 904 *sk = stat_table[i][1]; 905 *asc = stat_table[i][2]; 906 *ascq = stat_table[i][3]; 907 goto translate_done; 908 } 909 } 910 /* No error? Undecoded? */ 911 if (verbose) 912 printk(KERN_WARNING "ata%u: no sense translation for " 913 "status: 0x%02x\n", id, drv_stat); 914 915 /* We need a sensible error return here, which is tricky, and one 916 that won't cause people to do things like return a disk wrongly */ 917 *sk = ABORTED_COMMAND; 918 *asc = 0x00; 919 *ascq = 0x00; 920 921 translate_done: 922 if (verbose) 923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 925 id, drv_stat, drv_err, *sk, *asc, *ascq); 926 return; 927 } 928 929 /* 930 * ata_gen_passthru_sense - Generate check condition sense block. 931 * @qc: Command that completed. 932 * 933 * This function is specific to the ATA descriptor format sense 934 * block specified for the ATA pass through commands. Regardless 935 * of whether the command errored or not, return a sense 936 * block. Copy all controller registers into the sense 937 * block. Clear sense key, ASC & ASCQ if there is no error. 938 * 939 * LOCKING: 940 * None. 941 */ 942 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 943 { 944 struct scsi_cmnd *cmd = qc->scsicmd; 945 struct ata_taskfile *tf = &qc->result_tf; 946 unsigned char *sb = cmd->sense_buffer; 947 unsigned char *desc = sb + 8; 948 int verbose = qc->ap->ops->error_handler == NULL; 949 950 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 951 952 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 953 954 /* 955 * Use ata_to_sense_error() to map status register bits 956 * onto sense key, asc & ascq. 957 */ 958 if (qc->err_mask || 959 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 960 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 961 &sb[1], &sb[2], &sb[3], verbose); 962 sb[1] &= 0x0f; 963 } 964 965 /* 966 * Sense data is current and format is descriptor. 967 */ 968 sb[0] = 0x72; 969 970 desc[0] = 0x09; 971 972 /* set length of additional sense data */ 973 sb[7] = 14; 974 desc[1] = 12; 975 976 /* 977 * Copy registers into sense buffer. 978 */ 979 desc[2] = 0x00; 980 desc[3] = tf->feature; /* == error reg */ 981 desc[5] = tf->nsect; 982 desc[7] = tf->lbal; 983 desc[9] = tf->lbam; 984 desc[11] = tf->lbah; 985 desc[12] = tf->device; 986 desc[13] = tf->command; /* == status reg */ 987 988 /* 989 * Fill in Extend bit, and the high order bytes 990 * if applicable. 991 */ 992 if (tf->flags & ATA_TFLAG_LBA48) { 993 desc[2] |= 0x01; 994 desc[4] = tf->hob_nsect; 995 desc[6] = tf->hob_lbal; 996 desc[8] = tf->hob_lbam; 997 desc[10] = tf->hob_lbah; 998 } 999 } 1000 1001 /** 1002 * ata_gen_ata_sense - generate a SCSI fixed sense block 1003 * @qc: Command that we are erroring out 1004 * 1005 * Generate sense block for a failed ATA command @qc. Descriptor 1006 * format is used to accomodate LBA48 block address. 1007 * 1008 * LOCKING: 1009 * None. 1010 */ 1011 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1012 { 1013 struct ata_device *dev = qc->dev; 1014 struct scsi_cmnd *cmd = qc->scsicmd; 1015 struct ata_taskfile *tf = &qc->result_tf; 1016 unsigned char *sb = cmd->sense_buffer; 1017 unsigned char *desc = sb + 8; 1018 int verbose = qc->ap->ops->error_handler == NULL; 1019 u64 block; 1020 1021 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1022 1023 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1024 1025 /* sense data is current and format is descriptor */ 1026 sb[0] = 0x72; 1027 1028 /* Use ata_to_sense_error() to map status register bits 1029 * onto sense key, asc & ascq. 1030 */ 1031 if (qc->err_mask || 1032 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1033 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1034 &sb[1], &sb[2], &sb[3], verbose); 1035 sb[1] &= 0x0f; 1036 } 1037 1038 block = ata_tf_read_block(&qc->result_tf, dev); 1039 1040 /* information sense data descriptor */ 1041 sb[7] = 12; 1042 desc[0] = 0x00; 1043 desc[1] = 10; 1044 1045 desc[2] |= 0x80; /* valid */ 1046 desc[6] = block >> 40; 1047 desc[7] = block >> 32; 1048 desc[8] = block >> 24; 1049 desc[9] = block >> 16; 1050 desc[10] = block >> 8; 1051 desc[11] = block; 1052 } 1053 1054 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1055 { 1056 sdev->use_10_for_rw = 1; 1057 sdev->use_10_for_ms = 1; 1058 1059 /* Schedule policy is determined by ->qc_defer() callback and 1060 * it needs to see every deferred qc. Set dev_blocked to 1 to 1061 * prevent SCSI midlayer from automatically deferring 1062 * requests. 1063 */ 1064 sdev->max_device_blocked = 1; 1065 } 1066 1067 /** 1068 * atapi_drain_needed - Check whether data transfer may overflow 1069 * @rq: request to be checked 1070 * 1071 * ATAPI commands which transfer variable length data to host 1072 * might overflow due to application error or hardare bug. This 1073 * function checks whether overflow should be drained and ignored 1074 * for @request. 1075 * 1076 * LOCKING: 1077 * None. 1078 * 1079 * RETURNS: 1080 * 1 if ; otherwise, 0. 1081 */ 1082 static int atapi_drain_needed(struct request *rq) 1083 { 1084 if (likely(!blk_pc_request(rq))) 1085 return 0; 1086 1087 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW)) 1088 return 0; 1089 1090 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1091 } 1092 1093 static int ata_scsi_dev_config(struct scsi_device *sdev, 1094 struct ata_device *dev) 1095 { 1096 if (!ata_id_has_unload(dev->id)) 1097 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1098 1099 /* configure max sectors */ 1100 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 1101 1102 if (dev->class == ATA_DEV_ATAPI) { 1103 struct request_queue *q = sdev->request_queue; 1104 void *buf; 1105 1106 /* set the min alignment and padding */ 1107 blk_queue_update_dma_alignment(sdev->request_queue, 1108 ATA_DMA_PAD_SZ - 1); 1109 blk_queue_update_dma_pad(sdev->request_queue, 1110 ATA_DMA_PAD_SZ - 1); 1111 1112 /* configure draining */ 1113 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1114 if (!buf) { 1115 ata_dev_printk(dev, KERN_ERR, 1116 "drain buffer allocation failed\n"); 1117 return -ENOMEM; 1118 } 1119 1120 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1121 } else { 1122 /* ATA devices must be sector aligned */ 1123 blk_queue_update_dma_alignment(sdev->request_queue, 1124 ATA_SECT_SIZE - 1); 1125 sdev->manage_start_stop = 1; 1126 } 1127 1128 if (dev->flags & ATA_DFLAG_AN) 1129 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1130 1131 if (dev->flags & ATA_DFLAG_NCQ) { 1132 int depth; 1133 1134 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1135 depth = min(ATA_MAX_QUEUE - 1, depth); 1136 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1137 } 1138 1139 return 0; 1140 } 1141 1142 /** 1143 * ata_scsi_slave_config - Set SCSI device attributes 1144 * @sdev: SCSI device to examine 1145 * 1146 * This is called before we actually start reading 1147 * and writing to the device, to configure certain 1148 * SCSI mid-layer behaviors. 1149 * 1150 * LOCKING: 1151 * Defined by SCSI layer. We don't really care. 1152 */ 1153 1154 int ata_scsi_slave_config(struct scsi_device *sdev) 1155 { 1156 struct ata_port *ap = ata_shost_to_port(sdev->host); 1157 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1158 int rc = 0; 1159 1160 ata_scsi_sdev_config(sdev); 1161 1162 if (dev) 1163 rc = ata_scsi_dev_config(sdev, dev); 1164 1165 return rc; 1166 } 1167 1168 /** 1169 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1170 * @sdev: SCSI device to be destroyed 1171 * 1172 * @sdev is about to be destroyed for hot/warm unplugging. If 1173 * this unplugging was initiated by libata as indicated by NULL 1174 * dev->sdev, this function doesn't have to do anything. 1175 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1176 * Clear dev->sdev, schedule the device for ATA detach and invoke 1177 * EH. 1178 * 1179 * LOCKING: 1180 * Defined by SCSI layer. We don't really care. 1181 */ 1182 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1183 { 1184 struct ata_port *ap = ata_shost_to_port(sdev->host); 1185 struct request_queue *q = sdev->request_queue; 1186 unsigned long flags; 1187 struct ata_device *dev; 1188 1189 if (!ap->ops->error_handler) 1190 return; 1191 1192 spin_lock_irqsave(ap->lock, flags); 1193 dev = __ata_scsi_find_dev(ap, sdev); 1194 if (dev && dev->sdev) { 1195 /* SCSI device already in CANCEL state, no need to offline it */ 1196 dev->sdev = NULL; 1197 dev->flags |= ATA_DFLAG_DETACH; 1198 ata_port_schedule_eh(ap); 1199 } 1200 spin_unlock_irqrestore(ap->lock, flags); 1201 1202 kfree(q->dma_drain_buffer); 1203 q->dma_drain_buffer = NULL; 1204 q->dma_drain_size = 0; 1205 } 1206 1207 /** 1208 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1209 * @sdev: SCSI device to configure queue depth for 1210 * @queue_depth: new queue depth 1211 * 1212 * This is libata standard hostt->change_queue_depth callback. 1213 * SCSI will call into this callback when user tries to set queue 1214 * depth via sysfs. 1215 * 1216 * LOCKING: 1217 * SCSI layer (we don't care) 1218 * 1219 * RETURNS: 1220 * Newly configured queue depth. 1221 */ 1222 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1223 { 1224 struct ata_port *ap = ata_shost_to_port(sdev->host); 1225 struct ata_device *dev; 1226 unsigned long flags; 1227 1228 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1229 return sdev->queue_depth; 1230 1231 dev = ata_scsi_find_dev(ap, sdev); 1232 if (!dev || !ata_dev_enabled(dev)) 1233 return sdev->queue_depth; 1234 1235 /* NCQ enabled? */ 1236 spin_lock_irqsave(ap->lock, flags); 1237 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1238 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1239 dev->flags |= ATA_DFLAG_NCQ_OFF; 1240 queue_depth = 1; 1241 } 1242 spin_unlock_irqrestore(ap->lock, flags); 1243 1244 /* limit and apply queue depth */ 1245 queue_depth = min(queue_depth, sdev->host->can_queue); 1246 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1247 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1248 1249 if (sdev->queue_depth == queue_depth) 1250 return -EINVAL; 1251 1252 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1253 return queue_depth; 1254 } 1255 1256 /** 1257 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1258 * @qc: Storage for translated ATA taskfile 1259 * 1260 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1261 * (to start). Perhaps these commands should be preceded by 1262 * CHECK POWER MODE to see what power mode the device is already in. 1263 * [See SAT revision 5 at www.t10.org] 1264 * 1265 * LOCKING: 1266 * spin_lock_irqsave(host lock) 1267 * 1268 * RETURNS: 1269 * Zero on success, non-zero on error. 1270 */ 1271 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1272 { 1273 struct scsi_cmnd *scmd = qc->scsicmd; 1274 struct ata_taskfile *tf = &qc->tf; 1275 const u8 *cdb = scmd->cmnd; 1276 1277 if (scmd->cmd_len < 5) 1278 goto invalid_fld; 1279 1280 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1281 tf->protocol = ATA_PROT_NODATA; 1282 if (cdb[1] & 0x1) { 1283 ; /* ignore IMMED bit, violates sat-r05 */ 1284 } 1285 if (cdb[4] & 0x2) 1286 goto invalid_fld; /* LOEJ bit set not supported */ 1287 if (((cdb[4] >> 4) & 0xf) != 0) 1288 goto invalid_fld; /* power conditions not supported */ 1289 1290 if (cdb[4] & 0x1) { 1291 tf->nsect = 1; /* 1 sector, lba=0 */ 1292 1293 if (qc->dev->flags & ATA_DFLAG_LBA) { 1294 tf->flags |= ATA_TFLAG_LBA; 1295 1296 tf->lbah = 0x0; 1297 tf->lbam = 0x0; 1298 tf->lbal = 0x0; 1299 tf->device |= ATA_LBA; 1300 } else { 1301 /* CHS */ 1302 tf->lbal = 0x1; /* sect */ 1303 tf->lbam = 0x0; /* cyl low */ 1304 tf->lbah = 0x0; /* cyl high */ 1305 } 1306 1307 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1308 } else { 1309 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1310 * or S5) causing some drives to spin up and down again. 1311 */ 1312 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1313 system_state == SYSTEM_POWER_OFF) 1314 goto skip; 1315 1316 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1317 system_entering_hibernation()) 1318 goto skip; 1319 1320 /* Issue ATA STANDBY IMMEDIATE command */ 1321 tf->command = ATA_CMD_STANDBYNOW1; 1322 } 1323 1324 /* 1325 * Standby and Idle condition timers could be implemented but that 1326 * would require libata to implement the Power condition mode page 1327 * and allow the user to change it. Changing mode pages requires 1328 * MODE SELECT to be implemented. 1329 */ 1330 1331 return 0; 1332 1333 invalid_fld: 1334 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1335 /* "Invalid field in cbd" */ 1336 return 1; 1337 skip: 1338 scmd->result = SAM_STAT_GOOD; 1339 return 1; 1340 } 1341 1342 1343 /** 1344 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1345 * @qc: Storage for translated ATA taskfile 1346 * 1347 * Sets up an ATA taskfile to issue FLUSH CACHE or 1348 * FLUSH CACHE EXT. 1349 * 1350 * LOCKING: 1351 * spin_lock_irqsave(host lock) 1352 * 1353 * RETURNS: 1354 * Zero on success, non-zero on error. 1355 */ 1356 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1357 { 1358 struct ata_taskfile *tf = &qc->tf; 1359 1360 tf->flags |= ATA_TFLAG_DEVICE; 1361 tf->protocol = ATA_PROT_NODATA; 1362 1363 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1364 tf->command = ATA_CMD_FLUSH_EXT; 1365 else 1366 tf->command = ATA_CMD_FLUSH; 1367 1368 /* flush is critical for IO integrity, consider it an IO command */ 1369 qc->flags |= ATA_QCFLAG_IO; 1370 1371 return 0; 1372 } 1373 1374 /** 1375 * scsi_6_lba_len - Get LBA and transfer length 1376 * @cdb: SCSI command to translate 1377 * 1378 * Calculate LBA and transfer length for 6-byte commands. 1379 * 1380 * RETURNS: 1381 * @plba: the LBA 1382 * @plen: the transfer length 1383 */ 1384 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1385 { 1386 u64 lba = 0; 1387 u32 len; 1388 1389 VPRINTK("six-byte command\n"); 1390 1391 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1392 lba |= ((u64)cdb[2]) << 8; 1393 lba |= ((u64)cdb[3]); 1394 1395 len = cdb[4]; 1396 1397 *plba = lba; 1398 *plen = len; 1399 } 1400 1401 /** 1402 * scsi_10_lba_len - Get LBA and transfer length 1403 * @cdb: SCSI command to translate 1404 * 1405 * Calculate LBA and transfer length for 10-byte commands. 1406 * 1407 * RETURNS: 1408 * @plba: the LBA 1409 * @plen: the transfer length 1410 */ 1411 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1412 { 1413 u64 lba = 0; 1414 u32 len = 0; 1415 1416 VPRINTK("ten-byte command\n"); 1417 1418 lba |= ((u64)cdb[2]) << 24; 1419 lba |= ((u64)cdb[3]) << 16; 1420 lba |= ((u64)cdb[4]) << 8; 1421 lba |= ((u64)cdb[5]); 1422 1423 len |= ((u32)cdb[7]) << 8; 1424 len |= ((u32)cdb[8]); 1425 1426 *plba = lba; 1427 *plen = len; 1428 } 1429 1430 /** 1431 * scsi_16_lba_len - Get LBA and transfer length 1432 * @cdb: SCSI command to translate 1433 * 1434 * Calculate LBA and transfer length for 16-byte commands. 1435 * 1436 * RETURNS: 1437 * @plba: the LBA 1438 * @plen: the transfer length 1439 */ 1440 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1441 { 1442 u64 lba = 0; 1443 u32 len = 0; 1444 1445 VPRINTK("sixteen-byte command\n"); 1446 1447 lba |= ((u64)cdb[2]) << 56; 1448 lba |= ((u64)cdb[3]) << 48; 1449 lba |= ((u64)cdb[4]) << 40; 1450 lba |= ((u64)cdb[5]) << 32; 1451 lba |= ((u64)cdb[6]) << 24; 1452 lba |= ((u64)cdb[7]) << 16; 1453 lba |= ((u64)cdb[8]) << 8; 1454 lba |= ((u64)cdb[9]); 1455 1456 len |= ((u32)cdb[10]) << 24; 1457 len |= ((u32)cdb[11]) << 16; 1458 len |= ((u32)cdb[12]) << 8; 1459 len |= ((u32)cdb[13]); 1460 1461 *plba = lba; 1462 *plen = len; 1463 } 1464 1465 /** 1466 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1467 * @qc: Storage for translated ATA taskfile 1468 * 1469 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1470 * 1471 * LOCKING: 1472 * spin_lock_irqsave(host lock) 1473 * 1474 * RETURNS: 1475 * Zero on success, non-zero on error. 1476 */ 1477 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1478 { 1479 struct scsi_cmnd *scmd = qc->scsicmd; 1480 struct ata_taskfile *tf = &qc->tf; 1481 struct ata_device *dev = qc->dev; 1482 u64 dev_sectors = qc->dev->n_sectors; 1483 const u8 *cdb = scmd->cmnd; 1484 u64 block; 1485 u32 n_block; 1486 1487 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1488 tf->protocol = ATA_PROT_NODATA; 1489 1490 if (cdb[0] == VERIFY) { 1491 if (scmd->cmd_len < 10) 1492 goto invalid_fld; 1493 scsi_10_lba_len(cdb, &block, &n_block); 1494 } else if (cdb[0] == VERIFY_16) { 1495 if (scmd->cmd_len < 16) 1496 goto invalid_fld; 1497 scsi_16_lba_len(cdb, &block, &n_block); 1498 } else 1499 goto invalid_fld; 1500 1501 if (!n_block) 1502 goto nothing_to_do; 1503 if (block >= dev_sectors) 1504 goto out_of_range; 1505 if ((block + n_block) > dev_sectors) 1506 goto out_of_range; 1507 1508 if (dev->flags & ATA_DFLAG_LBA) { 1509 tf->flags |= ATA_TFLAG_LBA; 1510 1511 if (lba_28_ok(block, n_block)) { 1512 /* use LBA28 */ 1513 tf->command = ATA_CMD_VERIFY; 1514 tf->device |= (block >> 24) & 0xf; 1515 } else if (lba_48_ok(block, n_block)) { 1516 if (!(dev->flags & ATA_DFLAG_LBA48)) 1517 goto out_of_range; 1518 1519 /* use LBA48 */ 1520 tf->flags |= ATA_TFLAG_LBA48; 1521 tf->command = ATA_CMD_VERIFY_EXT; 1522 1523 tf->hob_nsect = (n_block >> 8) & 0xff; 1524 1525 tf->hob_lbah = (block >> 40) & 0xff; 1526 tf->hob_lbam = (block >> 32) & 0xff; 1527 tf->hob_lbal = (block >> 24) & 0xff; 1528 } else 1529 /* request too large even for LBA48 */ 1530 goto out_of_range; 1531 1532 tf->nsect = n_block & 0xff; 1533 1534 tf->lbah = (block >> 16) & 0xff; 1535 tf->lbam = (block >> 8) & 0xff; 1536 tf->lbal = block & 0xff; 1537 1538 tf->device |= ATA_LBA; 1539 } else { 1540 /* CHS */ 1541 u32 sect, head, cyl, track; 1542 1543 if (!lba_28_ok(block, n_block)) 1544 goto out_of_range; 1545 1546 /* Convert LBA to CHS */ 1547 track = (u32)block / dev->sectors; 1548 cyl = track / dev->heads; 1549 head = track % dev->heads; 1550 sect = (u32)block % dev->sectors + 1; 1551 1552 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1553 (u32)block, track, cyl, head, sect); 1554 1555 /* Check whether the converted CHS can fit. 1556 Cylinder: 0-65535 1557 Head: 0-15 1558 Sector: 1-255*/ 1559 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1560 goto out_of_range; 1561 1562 tf->command = ATA_CMD_VERIFY; 1563 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1564 tf->lbal = sect; 1565 tf->lbam = cyl; 1566 tf->lbah = cyl >> 8; 1567 tf->device |= head; 1568 } 1569 1570 return 0; 1571 1572 invalid_fld: 1573 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1574 /* "Invalid field in cbd" */ 1575 return 1; 1576 1577 out_of_range: 1578 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1579 /* "Logical Block Address out of range" */ 1580 return 1; 1581 1582 nothing_to_do: 1583 scmd->result = SAM_STAT_GOOD; 1584 return 1; 1585 } 1586 1587 /** 1588 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1589 * @qc: Storage for translated ATA taskfile 1590 * 1591 * Converts any of six SCSI read/write commands into the 1592 * ATA counterpart, including starting sector (LBA), 1593 * sector count, and taking into account the device's LBA48 1594 * support. 1595 * 1596 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1597 * %WRITE_16 are currently supported. 1598 * 1599 * LOCKING: 1600 * spin_lock_irqsave(host lock) 1601 * 1602 * RETURNS: 1603 * Zero on success, non-zero on error. 1604 */ 1605 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1606 { 1607 struct scsi_cmnd *scmd = qc->scsicmd; 1608 const u8 *cdb = scmd->cmnd; 1609 unsigned int tf_flags = 0; 1610 u64 block; 1611 u32 n_block; 1612 int rc; 1613 1614 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1615 tf_flags |= ATA_TFLAG_WRITE; 1616 1617 /* Calculate the SCSI LBA, transfer length and FUA. */ 1618 switch (cdb[0]) { 1619 case READ_10: 1620 case WRITE_10: 1621 if (unlikely(scmd->cmd_len < 10)) 1622 goto invalid_fld; 1623 scsi_10_lba_len(cdb, &block, &n_block); 1624 if (unlikely(cdb[1] & (1 << 3))) 1625 tf_flags |= ATA_TFLAG_FUA; 1626 break; 1627 case READ_6: 1628 case WRITE_6: 1629 if (unlikely(scmd->cmd_len < 6)) 1630 goto invalid_fld; 1631 scsi_6_lba_len(cdb, &block, &n_block); 1632 1633 /* for 6-byte r/w commands, transfer length 0 1634 * means 256 blocks of data, not 0 block. 1635 */ 1636 if (!n_block) 1637 n_block = 256; 1638 break; 1639 case READ_16: 1640 case WRITE_16: 1641 if (unlikely(scmd->cmd_len < 16)) 1642 goto invalid_fld; 1643 scsi_16_lba_len(cdb, &block, &n_block); 1644 if (unlikely(cdb[1] & (1 << 3))) 1645 tf_flags |= ATA_TFLAG_FUA; 1646 break; 1647 default: 1648 DPRINTK("no-byte command\n"); 1649 goto invalid_fld; 1650 } 1651 1652 /* Check and compose ATA command */ 1653 if (!n_block) 1654 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1655 * length 0 means transfer 0 block of data. 1656 * However, for ATA R/W commands, sector count 0 means 1657 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1658 * 1659 * WARNING: one or two older ATA drives treat 0 as 0... 1660 */ 1661 goto nothing_to_do; 1662 1663 qc->flags |= ATA_QCFLAG_IO; 1664 qc->nbytes = n_block * ATA_SECT_SIZE; 1665 1666 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1667 qc->tag); 1668 if (likely(rc == 0)) 1669 return 0; 1670 1671 if (rc == -ERANGE) 1672 goto out_of_range; 1673 /* treat all other errors as -EINVAL, fall through */ 1674 invalid_fld: 1675 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1676 /* "Invalid field in cbd" */ 1677 return 1; 1678 1679 out_of_range: 1680 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1681 /* "Logical Block Address out of range" */ 1682 return 1; 1683 1684 nothing_to_do: 1685 scmd->result = SAM_STAT_GOOD; 1686 return 1; 1687 } 1688 1689 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1690 { 1691 struct ata_port *ap = qc->ap; 1692 struct scsi_cmnd *cmd = qc->scsicmd; 1693 u8 *cdb = cmd->cmnd; 1694 int need_sense = (qc->err_mask != 0); 1695 1696 /* For ATA pass thru (SAT) commands, generate a sense block if 1697 * user mandated it or if there's an error. Note that if we 1698 * generate because the user forced us to, a check condition 1699 * is generated and the ATA register values are returned 1700 * whether the command completed successfully or not. If there 1701 * was no error, SK, ASC and ASCQ will all be zero. 1702 */ 1703 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1704 ((cdb[2] & 0x20) || need_sense)) { 1705 ata_gen_passthru_sense(qc); 1706 } else { 1707 if (!need_sense) { 1708 cmd->result = SAM_STAT_GOOD; 1709 } else { 1710 /* TODO: decide which descriptor format to use 1711 * for 48b LBA devices and call that here 1712 * instead of the fixed desc, which is only 1713 * good for smaller LBA (and maybe CHS?) 1714 * devices. 1715 */ 1716 ata_gen_ata_sense(qc); 1717 } 1718 } 1719 1720 if (need_sense && !ap->ops->error_handler) 1721 ata_dump_status(ap->print_id, &qc->result_tf); 1722 1723 qc->scsidone(cmd); 1724 1725 ata_qc_free(qc); 1726 } 1727 1728 /** 1729 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1730 * @dev: ATA device to which the command is addressed 1731 * @cmd: SCSI command to execute 1732 * @done: SCSI command completion function 1733 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1734 * 1735 * Our ->queuecommand() function has decided that the SCSI 1736 * command issued can be directly translated into an ATA 1737 * command, rather than handled internally. 1738 * 1739 * This function sets up an ata_queued_cmd structure for the 1740 * SCSI command, and sends that ata_queued_cmd to the hardware. 1741 * 1742 * The xlat_func argument (actor) returns 0 if ready to execute 1743 * ATA command, else 1 to finish translation. If 1 is returned 1744 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1745 * to be set reflecting an error condition or clean (early) 1746 * termination. 1747 * 1748 * LOCKING: 1749 * spin_lock_irqsave(host lock) 1750 * 1751 * RETURNS: 1752 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1753 * needs to be deferred. 1754 */ 1755 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1756 void (*done)(struct scsi_cmnd *), 1757 ata_xlat_func_t xlat_func) 1758 { 1759 struct ata_port *ap = dev->link->ap; 1760 struct ata_queued_cmd *qc; 1761 int rc; 1762 1763 VPRINTK("ENTER\n"); 1764 1765 qc = ata_scsi_qc_new(dev, cmd, done); 1766 if (!qc) 1767 goto err_mem; 1768 1769 /* data is present; dma-map it */ 1770 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1771 cmd->sc_data_direction == DMA_TO_DEVICE) { 1772 if (unlikely(scsi_bufflen(cmd) < 1)) { 1773 ata_dev_printk(dev, KERN_WARNING, 1774 "WARNING: zero len r/w req\n"); 1775 goto err_did; 1776 } 1777 1778 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1779 1780 qc->dma_dir = cmd->sc_data_direction; 1781 } 1782 1783 qc->complete_fn = ata_scsi_qc_complete; 1784 1785 if (xlat_func(qc)) 1786 goto early_finish; 1787 1788 if (ap->ops->qc_defer) { 1789 if ((rc = ap->ops->qc_defer(qc))) 1790 goto defer; 1791 } 1792 1793 /* select device, send command to hardware */ 1794 ata_qc_issue(qc); 1795 1796 VPRINTK("EXIT\n"); 1797 return 0; 1798 1799 early_finish: 1800 ata_qc_free(qc); 1801 qc->scsidone(cmd); 1802 DPRINTK("EXIT - early finish (good or error)\n"); 1803 return 0; 1804 1805 err_did: 1806 ata_qc_free(qc); 1807 cmd->result = (DID_ERROR << 16); 1808 qc->scsidone(cmd); 1809 err_mem: 1810 DPRINTK("EXIT - internal\n"); 1811 return 0; 1812 1813 defer: 1814 ata_qc_free(qc); 1815 DPRINTK("EXIT - defer\n"); 1816 if (rc == ATA_DEFER_LINK) 1817 return SCSI_MLQUEUE_DEVICE_BUSY; 1818 else 1819 return SCSI_MLQUEUE_HOST_BUSY; 1820 } 1821 1822 /** 1823 * ata_scsi_rbuf_get - Map response buffer. 1824 * @cmd: SCSI command containing buffer to be mapped. 1825 * @flags: unsigned long variable to store irq enable status 1826 * @copy_in: copy in from user buffer 1827 * 1828 * Prepare buffer for simulated SCSI commands. 1829 * 1830 * LOCKING: 1831 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1832 * 1833 * RETURNS: 1834 * Pointer to response buffer. 1835 */ 1836 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1837 unsigned long *flags) 1838 { 1839 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1840 1841 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1842 if (copy_in) 1843 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1844 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1845 return ata_scsi_rbuf; 1846 } 1847 1848 /** 1849 * ata_scsi_rbuf_put - Unmap response buffer. 1850 * @cmd: SCSI command containing buffer to be unmapped. 1851 * @copy_out: copy out result 1852 * @flags: @flags passed to ata_scsi_rbuf_get() 1853 * 1854 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1855 * @copy_back is true. 1856 * 1857 * LOCKING: 1858 * Unlocks ata_scsi_rbuf_lock. 1859 */ 1860 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1861 unsigned long *flags) 1862 { 1863 if (copy_out) 1864 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1865 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1866 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1867 } 1868 1869 /** 1870 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1871 * @args: device IDENTIFY data / SCSI command of interest. 1872 * @actor: Callback hook for desired SCSI command simulator 1873 * 1874 * Takes care of the hard work of simulating a SCSI command... 1875 * Mapping the response buffer, calling the command's handler, 1876 * and handling the handler's return value. This return value 1877 * indicates whether the handler wishes the SCSI command to be 1878 * completed successfully (0), or not (in which case cmd->result 1879 * and sense buffer are assumed to be set). 1880 * 1881 * LOCKING: 1882 * spin_lock_irqsave(host lock) 1883 */ 1884 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1885 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1886 { 1887 u8 *rbuf; 1888 unsigned int rc; 1889 struct scsi_cmnd *cmd = args->cmd; 1890 unsigned long flags; 1891 1892 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1893 rc = actor(args, rbuf); 1894 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1895 1896 if (rc == 0) 1897 cmd->result = SAM_STAT_GOOD; 1898 args->done(cmd); 1899 } 1900 1901 /** 1902 * ata_scsiop_inq_std - Simulate INQUIRY command 1903 * @args: device IDENTIFY data / SCSI command of interest. 1904 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1905 * 1906 * Returns standard device identification data associated 1907 * with non-VPD INQUIRY command output. 1908 * 1909 * LOCKING: 1910 * spin_lock_irqsave(host lock) 1911 */ 1912 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1913 { 1914 const u8 versions[] = { 1915 0x60, /* SAM-3 (no version claimed) */ 1916 1917 0x03, 1918 0x20, /* SBC-2 (no version claimed) */ 1919 1920 0x02, 1921 0x60 /* SPC-3 (no version claimed) */ 1922 }; 1923 u8 hdr[] = { 1924 TYPE_DISK, 1925 0, 1926 0x5, /* claim SPC-3 version compatibility */ 1927 2, 1928 95 - 4 1929 }; 1930 1931 VPRINTK("ENTER\n"); 1932 1933 /* set scsi removeable (RMB) bit per ata bit */ 1934 if (ata_id_removeable(args->id)) 1935 hdr[1] |= (1 << 7); 1936 1937 memcpy(rbuf, hdr, sizeof(hdr)); 1938 memcpy(&rbuf[8], "ATA ", 8); 1939 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1940 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1941 1942 if (rbuf[32] == 0 || rbuf[32] == ' ') 1943 memcpy(&rbuf[32], "n/a ", 4); 1944 1945 memcpy(rbuf + 59, versions, sizeof(versions)); 1946 1947 return 0; 1948 } 1949 1950 /** 1951 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1952 * @args: device IDENTIFY data / SCSI command of interest. 1953 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1954 * 1955 * Returns list of inquiry VPD pages available. 1956 * 1957 * LOCKING: 1958 * spin_lock_irqsave(host lock) 1959 */ 1960 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1961 { 1962 const u8 pages[] = { 1963 0x00, /* page 0x00, this page */ 1964 0x80, /* page 0x80, unit serial no page */ 1965 0x83, /* page 0x83, device ident page */ 1966 0x89, /* page 0x89, ata info page */ 1967 0xb1, /* page 0xb1, block device characteristics page */ 1968 }; 1969 1970 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1971 memcpy(rbuf + 4, pages, sizeof(pages)); 1972 return 0; 1973 } 1974 1975 /** 1976 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1977 * @args: device IDENTIFY data / SCSI command of interest. 1978 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1979 * 1980 * Returns ATA device serial number. 1981 * 1982 * LOCKING: 1983 * spin_lock_irqsave(host lock) 1984 */ 1985 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1986 { 1987 const u8 hdr[] = { 1988 0, 1989 0x80, /* this page code */ 1990 0, 1991 ATA_ID_SERNO_LEN, /* page len */ 1992 }; 1993 1994 memcpy(rbuf, hdr, sizeof(hdr)); 1995 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1996 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1997 return 0; 1998 } 1999 2000 /** 2001 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2002 * @args: device IDENTIFY data / SCSI command of interest. 2003 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2004 * 2005 * Yields two logical unit device identification designators: 2006 * - vendor specific ASCII containing the ATA serial number 2007 * - SAT defined "t10 vendor id based" containing ASCII vendor 2008 * name ("ATA "), model and serial numbers. 2009 * 2010 * LOCKING: 2011 * spin_lock_irqsave(host lock) 2012 */ 2013 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2014 { 2015 const int sat_model_serial_desc_len = 68; 2016 int num; 2017 2018 rbuf[1] = 0x83; /* this page code */ 2019 num = 4; 2020 2021 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2022 rbuf[num + 0] = 2; 2023 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2024 num += 4; 2025 ata_id_string(args->id, (unsigned char *) rbuf + num, 2026 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2027 num += ATA_ID_SERNO_LEN; 2028 2029 /* SAT defined lu model and serial numbers descriptor */ 2030 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2031 rbuf[num + 0] = 2; 2032 rbuf[num + 1] = 1; 2033 rbuf[num + 3] = sat_model_serial_desc_len; 2034 num += 4; 2035 memcpy(rbuf + num, "ATA ", 8); 2036 num += 8; 2037 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2038 ATA_ID_PROD_LEN); 2039 num += ATA_ID_PROD_LEN; 2040 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2041 ATA_ID_SERNO_LEN); 2042 num += ATA_ID_SERNO_LEN; 2043 2044 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2045 return 0; 2046 } 2047 2048 /** 2049 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2050 * @args: device IDENTIFY data / SCSI command of interest. 2051 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2052 * 2053 * Yields SAT-specified ATA VPD page. 2054 * 2055 * LOCKING: 2056 * spin_lock_irqsave(host lock) 2057 */ 2058 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2059 { 2060 struct ata_taskfile tf; 2061 2062 memset(&tf, 0, sizeof(tf)); 2063 2064 rbuf[1] = 0x89; /* our page code */ 2065 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2066 rbuf[3] = (0x238 & 0xff); 2067 2068 memcpy(&rbuf[8], "linux ", 8); 2069 memcpy(&rbuf[16], "libata ", 16); 2070 memcpy(&rbuf[32], DRV_VERSION, 4); 2071 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2072 2073 /* we don't store the ATA device signature, so we fake it */ 2074 2075 tf.command = ATA_DRDY; /* really, this is Status reg */ 2076 tf.lbal = 0x1; 2077 tf.nsect = 0x1; 2078 2079 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2080 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2081 2082 rbuf[56] = ATA_CMD_ID_ATA; 2083 2084 memcpy(&rbuf[60], &args->id[0], 512); 2085 return 0; 2086 } 2087 2088 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2089 { 2090 int form_factor = ata_id_form_factor(args->id); 2091 int media_rotation_rate = ata_id_rotation_rate(args->id); 2092 2093 rbuf[1] = 0xb1; 2094 rbuf[3] = 0x3c; 2095 rbuf[4] = media_rotation_rate >> 8; 2096 rbuf[5] = media_rotation_rate; 2097 rbuf[7] = form_factor; 2098 2099 return 0; 2100 } 2101 2102 /** 2103 * ata_scsiop_noop - Command handler that simply returns success. 2104 * @args: device IDENTIFY data / SCSI command of interest. 2105 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2106 * 2107 * No operation. Simply returns success to caller, to indicate 2108 * that the caller should successfully complete this SCSI command. 2109 * 2110 * LOCKING: 2111 * spin_lock_irqsave(host lock) 2112 */ 2113 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2114 { 2115 VPRINTK("ENTER\n"); 2116 return 0; 2117 } 2118 2119 /** 2120 * ata_msense_caching - Simulate MODE SENSE caching info page 2121 * @id: device IDENTIFY data 2122 * @buf: output buffer 2123 * 2124 * Generate a caching info page, which conditionally indicates 2125 * write caching to the SCSI layer, depending on device 2126 * capabilities. 2127 * 2128 * LOCKING: 2129 * None. 2130 */ 2131 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2132 { 2133 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2134 if (ata_id_wcache_enabled(id)) 2135 buf[2] |= (1 << 2); /* write cache enable */ 2136 if (!ata_id_rahead_enabled(id)) 2137 buf[12] |= (1 << 5); /* disable read ahead */ 2138 return sizeof(def_cache_mpage); 2139 } 2140 2141 /** 2142 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2143 * @buf: output buffer 2144 * 2145 * Generate a generic MODE SENSE control mode page. 2146 * 2147 * LOCKING: 2148 * None. 2149 */ 2150 static unsigned int ata_msense_ctl_mode(u8 *buf) 2151 { 2152 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2153 return sizeof(def_control_mpage); 2154 } 2155 2156 /** 2157 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2158 * @buf: output buffer 2159 * 2160 * Generate a generic MODE SENSE r/w error recovery page. 2161 * 2162 * LOCKING: 2163 * None. 2164 */ 2165 static unsigned int ata_msense_rw_recovery(u8 *buf) 2166 { 2167 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2168 return sizeof(def_rw_recovery_mpage); 2169 } 2170 2171 /* 2172 * We can turn this into a real blacklist if it's needed, for now just 2173 * blacklist any Maxtor BANC1G10 revision firmware 2174 */ 2175 static int ata_dev_supports_fua(u16 *id) 2176 { 2177 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2178 2179 if (!libata_fua) 2180 return 0; 2181 if (!ata_id_has_fua(id)) 2182 return 0; 2183 2184 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2185 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2186 2187 if (strcmp(model, "Maxtor")) 2188 return 1; 2189 if (strcmp(fw, "BANC1G10")) 2190 return 1; 2191 2192 return 0; /* blacklisted */ 2193 } 2194 2195 /** 2196 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2197 * @args: device IDENTIFY data / SCSI command of interest. 2198 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2199 * 2200 * Simulate MODE SENSE commands. Assume this is invoked for direct 2201 * access devices (e.g. disks) only. There should be no block 2202 * descriptor for other device types. 2203 * 2204 * LOCKING: 2205 * spin_lock_irqsave(host lock) 2206 */ 2207 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2208 { 2209 struct ata_device *dev = args->dev; 2210 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2211 const u8 sat_blk_desc[] = { 2212 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2213 0, 2214 0, 0x2, 0x0 /* block length: 512 bytes */ 2215 }; 2216 u8 pg, spg; 2217 unsigned int ebd, page_control, six_byte; 2218 u8 dpofua; 2219 2220 VPRINTK("ENTER\n"); 2221 2222 six_byte = (scsicmd[0] == MODE_SENSE); 2223 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2224 /* 2225 * LLBA bit in msense(10) ignored (compliant) 2226 */ 2227 2228 page_control = scsicmd[2] >> 6; 2229 switch (page_control) { 2230 case 0: /* current */ 2231 break; /* supported */ 2232 case 3: /* saved */ 2233 goto saving_not_supp; 2234 case 1: /* changeable */ 2235 case 2: /* defaults */ 2236 default: 2237 goto invalid_fld; 2238 } 2239 2240 if (six_byte) 2241 p += 4 + (ebd ? 8 : 0); 2242 else 2243 p += 8 + (ebd ? 8 : 0); 2244 2245 pg = scsicmd[2] & 0x3f; 2246 spg = scsicmd[3]; 2247 /* 2248 * No mode subpages supported (yet) but asking for _all_ 2249 * subpages may be valid 2250 */ 2251 if (spg && (spg != ALL_SUB_MPAGES)) 2252 goto invalid_fld; 2253 2254 switch(pg) { 2255 case RW_RECOVERY_MPAGE: 2256 p += ata_msense_rw_recovery(p); 2257 break; 2258 2259 case CACHE_MPAGE: 2260 p += ata_msense_caching(args->id, p); 2261 break; 2262 2263 case CONTROL_MPAGE: 2264 p += ata_msense_ctl_mode(p); 2265 break; 2266 2267 case ALL_MPAGES: 2268 p += ata_msense_rw_recovery(p); 2269 p += ata_msense_caching(args->id, p); 2270 p += ata_msense_ctl_mode(p); 2271 break; 2272 2273 default: /* invalid page code */ 2274 goto invalid_fld; 2275 } 2276 2277 dpofua = 0; 2278 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2279 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2280 dpofua = 1 << 4; 2281 2282 if (six_byte) { 2283 rbuf[0] = p - rbuf - 1; 2284 rbuf[2] |= dpofua; 2285 if (ebd) { 2286 rbuf[3] = sizeof(sat_blk_desc); 2287 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2288 } 2289 } else { 2290 unsigned int output_len = p - rbuf - 2; 2291 2292 rbuf[0] = output_len >> 8; 2293 rbuf[1] = output_len; 2294 rbuf[3] |= dpofua; 2295 if (ebd) { 2296 rbuf[7] = sizeof(sat_blk_desc); 2297 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2298 } 2299 } 2300 return 0; 2301 2302 invalid_fld: 2303 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2304 /* "Invalid field in cbd" */ 2305 return 1; 2306 2307 saving_not_supp: 2308 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2309 /* "Saving parameters not supported" */ 2310 return 1; 2311 } 2312 2313 /** 2314 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2315 * @args: device IDENTIFY data / SCSI command of interest. 2316 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2317 * 2318 * Simulate READ CAPACITY commands. 2319 * 2320 * LOCKING: 2321 * None. 2322 */ 2323 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2324 { 2325 struct ata_device *dev = args->dev; 2326 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2327 u8 log_per_phys = 0; 2328 u16 lowest_aligned = 0; 2329 u16 word_106 = dev->id[106]; 2330 u16 word_209 = dev->id[209]; 2331 2332 if ((word_106 & 0xc000) == 0x4000) { 2333 /* Number and offset of logical sectors per physical sector */ 2334 if (word_106 & (1 << 13)) 2335 log_per_phys = word_106 & 0xf; 2336 if ((word_209 & 0xc000) == 0x4000) { 2337 u16 first = dev->id[209] & 0x3fff; 2338 if (first > 0) 2339 lowest_aligned = (1 << log_per_phys) - first; 2340 } 2341 } 2342 2343 VPRINTK("ENTER\n"); 2344 2345 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2346 if (last_lba >= 0xffffffffULL) 2347 last_lba = 0xffffffff; 2348 2349 /* sector count, 32-bit */ 2350 rbuf[0] = last_lba >> (8 * 3); 2351 rbuf[1] = last_lba >> (8 * 2); 2352 rbuf[2] = last_lba >> (8 * 1); 2353 rbuf[3] = last_lba; 2354 2355 /* sector size */ 2356 rbuf[6] = ATA_SECT_SIZE >> 8; 2357 rbuf[7] = ATA_SECT_SIZE & 0xff; 2358 } else { 2359 /* sector count, 64-bit */ 2360 rbuf[0] = last_lba >> (8 * 7); 2361 rbuf[1] = last_lba >> (8 * 6); 2362 rbuf[2] = last_lba >> (8 * 5); 2363 rbuf[3] = last_lba >> (8 * 4); 2364 rbuf[4] = last_lba >> (8 * 3); 2365 rbuf[5] = last_lba >> (8 * 2); 2366 rbuf[6] = last_lba >> (8 * 1); 2367 rbuf[7] = last_lba; 2368 2369 /* sector size */ 2370 rbuf[10] = ATA_SECT_SIZE >> 8; 2371 rbuf[11] = ATA_SECT_SIZE & 0xff; 2372 2373 rbuf[12] = 0; 2374 rbuf[13] = log_per_phys; 2375 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2376 rbuf[15] = lowest_aligned; 2377 } 2378 2379 return 0; 2380 } 2381 2382 /** 2383 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2384 * @args: device IDENTIFY data / SCSI command of interest. 2385 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2386 * 2387 * Simulate REPORT LUNS command. 2388 * 2389 * LOCKING: 2390 * spin_lock_irqsave(host lock) 2391 */ 2392 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2393 { 2394 VPRINTK("ENTER\n"); 2395 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2396 2397 return 0; 2398 } 2399 2400 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2401 { 2402 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2403 /* FIXME: not quite right; we don't want the 2404 * translation of taskfile registers into 2405 * a sense descriptors, since that's only 2406 * correct for ATA, not ATAPI 2407 */ 2408 ata_gen_passthru_sense(qc); 2409 } 2410 2411 qc->scsidone(qc->scsicmd); 2412 ata_qc_free(qc); 2413 } 2414 2415 /* is it pointless to prefer PIO for "safety reasons"? */ 2416 static inline int ata_pio_use_silly(struct ata_port *ap) 2417 { 2418 return (ap->flags & ATA_FLAG_PIO_DMA); 2419 } 2420 2421 static void atapi_request_sense(struct ata_queued_cmd *qc) 2422 { 2423 struct ata_port *ap = qc->ap; 2424 struct scsi_cmnd *cmd = qc->scsicmd; 2425 2426 DPRINTK("ATAPI request sense\n"); 2427 2428 /* FIXME: is this needed? */ 2429 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2430 2431 #ifdef CONFIG_ATA_SFF 2432 if (ap->ops->sff_tf_read) 2433 ap->ops->sff_tf_read(ap, &qc->tf); 2434 #endif 2435 2436 /* fill these in, for the case where they are -not- overwritten */ 2437 cmd->sense_buffer[0] = 0x70; 2438 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2439 2440 ata_qc_reinit(qc); 2441 2442 /* setup sg table and init transfer direction */ 2443 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2444 ata_sg_init(qc, &qc->sgent, 1); 2445 qc->dma_dir = DMA_FROM_DEVICE; 2446 2447 memset(&qc->cdb, 0, qc->dev->cdb_len); 2448 qc->cdb[0] = REQUEST_SENSE; 2449 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2450 2451 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2452 qc->tf.command = ATA_CMD_PACKET; 2453 2454 if (ata_pio_use_silly(ap)) { 2455 qc->tf.protocol = ATAPI_PROT_DMA; 2456 qc->tf.feature |= ATAPI_PKT_DMA; 2457 } else { 2458 qc->tf.protocol = ATAPI_PROT_PIO; 2459 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2460 qc->tf.lbah = 0; 2461 } 2462 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2463 2464 qc->complete_fn = atapi_sense_complete; 2465 2466 ata_qc_issue(qc); 2467 2468 DPRINTK("EXIT\n"); 2469 } 2470 2471 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2472 { 2473 struct scsi_cmnd *cmd = qc->scsicmd; 2474 unsigned int err_mask = qc->err_mask; 2475 2476 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2477 2478 /* handle completion from new EH */ 2479 if (unlikely(qc->ap->ops->error_handler && 2480 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2481 2482 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2483 /* FIXME: not quite right; we don't want the 2484 * translation of taskfile registers into a 2485 * sense descriptors, since that's only 2486 * correct for ATA, not ATAPI 2487 */ 2488 ata_gen_passthru_sense(qc); 2489 } 2490 2491 /* SCSI EH automatically locks door if sdev->locked is 2492 * set. Sometimes door lock request continues to 2493 * fail, for example, when no media is present. This 2494 * creates a loop - SCSI EH issues door lock which 2495 * fails and gets invoked again to acquire sense data 2496 * for the failed command. 2497 * 2498 * If door lock fails, always clear sdev->locked to 2499 * avoid this infinite loop. 2500 */ 2501 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2502 qc->dev->sdev->locked = 0; 2503 2504 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2505 qc->scsidone(cmd); 2506 ata_qc_free(qc); 2507 return; 2508 } 2509 2510 /* successful completion or old EH failure path */ 2511 if (unlikely(err_mask & AC_ERR_DEV)) { 2512 cmd->result = SAM_STAT_CHECK_CONDITION; 2513 atapi_request_sense(qc); 2514 return; 2515 } else if (unlikely(err_mask)) { 2516 /* FIXME: not quite right; we don't want the 2517 * translation of taskfile registers into 2518 * a sense descriptors, since that's only 2519 * correct for ATA, not ATAPI 2520 */ 2521 ata_gen_passthru_sense(qc); 2522 } else { 2523 u8 *scsicmd = cmd->cmnd; 2524 2525 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2526 unsigned long flags; 2527 u8 *buf; 2528 2529 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2530 2531 /* ATAPI devices typically report zero for their SCSI version, 2532 * and sometimes deviate from the spec WRT response data 2533 * format. If SCSI version is reported as zero like normal, 2534 * then we make the following fixups: 1) Fake MMC-5 version, 2535 * to indicate to the Linux scsi midlayer this is a modern 2536 * device. 2) Ensure response data format / ATAPI information 2537 * are always correct. 2538 */ 2539 if (buf[2] == 0) { 2540 buf[2] = 0x5; 2541 buf[3] = 0x32; 2542 } 2543 2544 ata_scsi_rbuf_put(cmd, true, &flags); 2545 } 2546 2547 cmd->result = SAM_STAT_GOOD; 2548 } 2549 2550 qc->scsidone(cmd); 2551 ata_qc_free(qc); 2552 } 2553 /** 2554 * atapi_xlat - Initialize PACKET taskfile 2555 * @qc: command structure to be initialized 2556 * 2557 * LOCKING: 2558 * spin_lock_irqsave(host lock) 2559 * 2560 * RETURNS: 2561 * Zero on success, non-zero on failure. 2562 */ 2563 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2564 { 2565 struct scsi_cmnd *scmd = qc->scsicmd; 2566 struct ata_device *dev = qc->dev; 2567 int nodata = (scmd->sc_data_direction == DMA_NONE); 2568 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2569 unsigned int nbytes; 2570 2571 memset(qc->cdb, 0, dev->cdb_len); 2572 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2573 2574 qc->complete_fn = atapi_qc_complete; 2575 2576 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2577 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2578 qc->tf.flags |= ATA_TFLAG_WRITE; 2579 DPRINTK("direction: write\n"); 2580 } 2581 2582 qc->tf.command = ATA_CMD_PACKET; 2583 ata_qc_set_pc_nbytes(qc); 2584 2585 /* check whether ATAPI DMA is safe */ 2586 if (!nodata && !using_pio && atapi_check_dma(qc)) 2587 using_pio = 1; 2588 2589 /* Some controller variants snoop this value for Packet 2590 * transfers to do state machine and FIFO management. Thus we 2591 * want to set it properly, and for DMA where it is 2592 * effectively meaningless. 2593 */ 2594 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2595 2596 /* Most ATAPI devices which honor transfer chunk size don't 2597 * behave according to the spec when odd chunk size which 2598 * matches the transfer length is specified. If the number of 2599 * bytes to transfer is 2n+1. According to the spec, what 2600 * should happen is to indicate that 2n+1 is going to be 2601 * transferred and transfer 2n+2 bytes where the last byte is 2602 * padding. 2603 * 2604 * In practice, this doesn't happen. ATAPI devices first 2605 * indicate and transfer 2n bytes and then indicate and 2606 * transfer 2 bytes where the last byte is padding. 2607 * 2608 * This inconsistency confuses several controllers which 2609 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2610 * These controllers use actual number of transferred bytes to 2611 * update DMA poitner and transfer of 4n+2 bytes make those 2612 * controller push DMA pointer by 4n+4 bytes because SATA data 2613 * FISes are aligned to 4 bytes. This causes data corruption 2614 * and buffer overrun. 2615 * 2616 * Always setting nbytes to even number solves this problem 2617 * because then ATAPI devices don't have to split data at 2n 2618 * boundaries. 2619 */ 2620 if (nbytes & 0x1) 2621 nbytes++; 2622 2623 qc->tf.lbam = (nbytes & 0xFF); 2624 qc->tf.lbah = (nbytes >> 8); 2625 2626 if (nodata) 2627 qc->tf.protocol = ATAPI_PROT_NODATA; 2628 else if (using_pio) 2629 qc->tf.protocol = ATAPI_PROT_PIO; 2630 else { 2631 /* DMA data xfer */ 2632 qc->tf.protocol = ATAPI_PROT_DMA; 2633 qc->tf.feature |= ATAPI_PKT_DMA; 2634 2635 if ((dev->flags & ATA_DFLAG_DMADIR) && 2636 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2637 /* some SATA bridges need us to indicate data xfer direction */ 2638 qc->tf.feature |= ATAPI_DMADIR; 2639 } 2640 2641 2642 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2643 as ATAPI tape drives don't get this right otherwise */ 2644 return 0; 2645 } 2646 2647 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2648 { 2649 if (!sata_pmp_attached(ap)) { 2650 if (likely(devno < ata_link_max_devices(&ap->link))) 2651 return &ap->link.device[devno]; 2652 } else { 2653 if (likely(devno < ap->nr_pmp_links)) 2654 return &ap->pmp_link[devno].device[0]; 2655 } 2656 2657 return NULL; 2658 } 2659 2660 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2661 const struct scsi_device *scsidev) 2662 { 2663 int devno; 2664 2665 /* skip commands not addressed to targets we simulate */ 2666 if (!sata_pmp_attached(ap)) { 2667 if (unlikely(scsidev->channel || scsidev->lun)) 2668 return NULL; 2669 devno = scsidev->id; 2670 } else { 2671 if (unlikely(scsidev->id || scsidev->lun)) 2672 return NULL; 2673 devno = scsidev->channel; 2674 } 2675 2676 return ata_find_dev(ap, devno); 2677 } 2678 2679 /** 2680 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2681 * @ap: ATA port to which the device is attached 2682 * @scsidev: SCSI device from which we derive the ATA device 2683 * 2684 * Given various information provided in struct scsi_cmnd, 2685 * map that onto an ATA bus, and using that mapping 2686 * determine which ata_device is associated with the 2687 * SCSI command to be sent. 2688 * 2689 * LOCKING: 2690 * spin_lock_irqsave(host lock) 2691 * 2692 * RETURNS: 2693 * Associated ATA device, or %NULL if not found. 2694 */ 2695 static struct ata_device * 2696 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2697 { 2698 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2699 2700 if (unlikely(!dev || !ata_dev_enabled(dev))) 2701 return NULL; 2702 2703 return dev; 2704 } 2705 2706 /* 2707 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2708 * @byte1: Byte 1 from pass-thru CDB. 2709 * 2710 * RETURNS: 2711 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2712 */ 2713 static u8 2714 ata_scsi_map_proto(u8 byte1) 2715 { 2716 switch((byte1 & 0x1e) >> 1) { 2717 case 3: /* Non-data */ 2718 return ATA_PROT_NODATA; 2719 2720 case 6: /* DMA */ 2721 case 10: /* UDMA Data-in */ 2722 case 11: /* UDMA Data-Out */ 2723 return ATA_PROT_DMA; 2724 2725 case 4: /* PIO Data-in */ 2726 case 5: /* PIO Data-out */ 2727 return ATA_PROT_PIO; 2728 2729 case 0: /* Hard Reset */ 2730 case 1: /* SRST */ 2731 case 8: /* Device Diagnostic */ 2732 case 9: /* Device Reset */ 2733 case 7: /* DMA Queued */ 2734 case 12: /* FPDMA */ 2735 case 15: /* Return Response Info */ 2736 default: /* Reserved */ 2737 break; 2738 } 2739 2740 return ATA_PROT_UNKNOWN; 2741 } 2742 2743 /** 2744 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2745 * @qc: command structure to be initialized 2746 * 2747 * Handles either 12 or 16-byte versions of the CDB. 2748 * 2749 * RETURNS: 2750 * Zero on success, non-zero on failure. 2751 */ 2752 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2753 { 2754 struct ata_taskfile *tf = &(qc->tf); 2755 struct scsi_cmnd *scmd = qc->scsicmd; 2756 struct ata_device *dev = qc->dev; 2757 const u8 *cdb = scmd->cmnd; 2758 2759 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2760 goto invalid_fld; 2761 2762 /* 2763 * 12 and 16 byte CDBs use different offsets to 2764 * provide the various register values. 2765 */ 2766 if (cdb[0] == ATA_16) { 2767 /* 2768 * 16-byte CDB - may contain extended commands. 2769 * 2770 * If that is the case, copy the upper byte register values. 2771 */ 2772 if (cdb[1] & 0x01) { 2773 tf->hob_feature = cdb[3]; 2774 tf->hob_nsect = cdb[5]; 2775 tf->hob_lbal = cdb[7]; 2776 tf->hob_lbam = cdb[9]; 2777 tf->hob_lbah = cdb[11]; 2778 tf->flags |= ATA_TFLAG_LBA48; 2779 } else 2780 tf->flags &= ~ATA_TFLAG_LBA48; 2781 2782 /* 2783 * Always copy low byte, device and command registers. 2784 */ 2785 tf->feature = cdb[4]; 2786 tf->nsect = cdb[6]; 2787 tf->lbal = cdb[8]; 2788 tf->lbam = cdb[10]; 2789 tf->lbah = cdb[12]; 2790 tf->device = cdb[13]; 2791 tf->command = cdb[14]; 2792 } else { 2793 /* 2794 * 12-byte CDB - incapable of extended commands. 2795 */ 2796 tf->flags &= ~ATA_TFLAG_LBA48; 2797 2798 tf->feature = cdb[3]; 2799 tf->nsect = cdb[4]; 2800 tf->lbal = cdb[5]; 2801 tf->lbam = cdb[6]; 2802 tf->lbah = cdb[7]; 2803 tf->device = cdb[8]; 2804 tf->command = cdb[9]; 2805 } 2806 2807 /* enforce correct master/slave bit */ 2808 tf->device = dev->devno ? 2809 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2810 2811 /* READ/WRITE LONG use a non-standard sect_size */ 2812 qc->sect_size = ATA_SECT_SIZE; 2813 switch (tf->command) { 2814 case ATA_CMD_READ_LONG: 2815 case ATA_CMD_READ_LONG_ONCE: 2816 case ATA_CMD_WRITE_LONG: 2817 case ATA_CMD_WRITE_LONG_ONCE: 2818 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2819 goto invalid_fld; 2820 qc->sect_size = scsi_bufflen(scmd); 2821 } 2822 2823 /* 2824 * Set flags so that all registers will be written, pass on 2825 * write indication (used for PIO/DMA setup), result TF is 2826 * copied back and we don't whine too much about its failure. 2827 */ 2828 tf->flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2829 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2830 tf->flags |= ATA_TFLAG_WRITE; 2831 2832 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2833 2834 /* 2835 * Set transfer length. 2836 * 2837 * TODO: find out if we need to do more here to 2838 * cover scatter/gather case. 2839 */ 2840 ata_qc_set_pc_nbytes(qc); 2841 2842 /* We may not issue DMA commands if no DMA mode is set */ 2843 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2844 goto invalid_fld; 2845 2846 /* sanity check for pio multi commands */ 2847 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2848 goto invalid_fld; 2849 2850 if (is_multi_taskfile(tf)) { 2851 unsigned int multi_count = 1 << (cdb[1] >> 5); 2852 2853 /* compare the passed through multi_count 2854 * with the cached multi_count of libata 2855 */ 2856 if (multi_count != dev->multi_count) 2857 ata_dev_printk(dev, KERN_WARNING, 2858 "invalid multi_count %u ignored\n", 2859 multi_count); 2860 } 2861 2862 /* 2863 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2864 * SET_FEATURES - XFER MODE must be preceded/succeeded 2865 * by an update to hardware-specific registers for each 2866 * controller (i.e. the reason for ->set_piomode(), 2867 * ->set_dmamode(), and ->post_set_mode() hooks). 2868 */ 2869 if (tf->command == ATA_CMD_SET_FEATURES && 2870 tf->feature == SETFEATURES_XFER) 2871 goto invalid_fld; 2872 2873 /* 2874 * Filter TPM commands by default. These provide an 2875 * essentially uncontrolled encrypted "back door" between 2876 * applications and the disk. Set libata.allow_tpm=1 if you 2877 * have a real reason for wanting to use them. This ensures 2878 * that installed software cannot easily mess stuff up without 2879 * user intent. DVR type users will probably ship with this enabled 2880 * for movie content management. 2881 * 2882 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2883 * for this and should do in future but that it is not sufficient as 2884 * DCS is an optional feature set. Thus we also do the software filter 2885 * so that we comply with the TC consortium stated goal that the user 2886 * can turn off TC features of their system. 2887 */ 2888 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2889 goto invalid_fld; 2890 2891 return 0; 2892 2893 invalid_fld: 2894 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2895 /* "Invalid field in cdb" */ 2896 return 1; 2897 } 2898 2899 /** 2900 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2901 * @dev: ATA device 2902 * @cmd: SCSI command opcode to consider 2903 * 2904 * Look up the SCSI command given, and determine whether the 2905 * SCSI command is to be translated or simulated. 2906 * 2907 * RETURNS: 2908 * Pointer to translation function if possible, %NULL if not. 2909 */ 2910 2911 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2912 { 2913 switch (cmd) { 2914 case READ_6: 2915 case READ_10: 2916 case READ_16: 2917 2918 case WRITE_6: 2919 case WRITE_10: 2920 case WRITE_16: 2921 return ata_scsi_rw_xlat; 2922 2923 case SYNCHRONIZE_CACHE: 2924 if (ata_try_flush_cache(dev)) 2925 return ata_scsi_flush_xlat; 2926 break; 2927 2928 case VERIFY: 2929 case VERIFY_16: 2930 return ata_scsi_verify_xlat; 2931 2932 case ATA_12: 2933 case ATA_16: 2934 return ata_scsi_pass_thru; 2935 2936 case START_STOP: 2937 return ata_scsi_start_stop_xlat; 2938 } 2939 2940 return NULL; 2941 } 2942 2943 /** 2944 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2945 * @ap: ATA port to which the command was being sent 2946 * @cmd: SCSI command to dump 2947 * 2948 * Prints the contents of a SCSI command via printk(). 2949 */ 2950 2951 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2952 struct scsi_cmnd *cmd) 2953 { 2954 #ifdef ATA_DEBUG 2955 struct scsi_device *scsidev = cmd->device; 2956 u8 *scsicmd = cmd->cmnd; 2957 2958 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2959 ap->print_id, 2960 scsidev->channel, scsidev->id, scsidev->lun, 2961 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2962 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2963 scsicmd[8]); 2964 #endif 2965 } 2966 2967 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 2968 void (*done)(struct scsi_cmnd *), 2969 struct ata_device *dev) 2970 { 2971 u8 scsi_op = scmd->cmnd[0]; 2972 ata_xlat_func_t xlat_func; 2973 int rc = 0; 2974 2975 if (dev->class == ATA_DEV_ATA) { 2976 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 2977 goto bad_cdb_len; 2978 2979 xlat_func = ata_get_xlat_func(dev, scsi_op); 2980 } else { 2981 if (unlikely(!scmd->cmd_len)) 2982 goto bad_cdb_len; 2983 2984 xlat_func = NULL; 2985 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 2986 /* relay SCSI command to ATAPI device */ 2987 int len = COMMAND_SIZE(scsi_op); 2988 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 2989 goto bad_cdb_len; 2990 2991 xlat_func = atapi_xlat; 2992 } else { 2993 /* ATA_16 passthru, treat as an ATA command */ 2994 if (unlikely(scmd->cmd_len > 16)) 2995 goto bad_cdb_len; 2996 2997 xlat_func = ata_get_xlat_func(dev, scsi_op); 2998 } 2999 } 3000 3001 if (xlat_func) 3002 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3003 else 3004 ata_scsi_simulate(dev, scmd, done); 3005 3006 return rc; 3007 3008 bad_cdb_len: 3009 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3010 scmd->cmd_len, scsi_op, dev->cdb_len); 3011 scmd->result = DID_ERROR << 16; 3012 done(scmd); 3013 return 0; 3014 } 3015 3016 /** 3017 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3018 * @cmd: SCSI command to be sent 3019 * @done: Completion function, called when command is complete 3020 * 3021 * In some cases, this function translates SCSI commands into 3022 * ATA taskfiles, and queues the taskfiles to be sent to 3023 * hardware. In other cases, this function simulates a 3024 * SCSI device by evaluating and responding to certain 3025 * SCSI commands. This creates the overall effect of 3026 * ATA and ATAPI devices appearing as SCSI devices. 3027 * 3028 * LOCKING: 3029 * Releases scsi-layer-held lock, and obtains host lock. 3030 * 3031 * RETURNS: 3032 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3033 * 0 otherwise. 3034 */ 3035 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3036 { 3037 struct ata_port *ap; 3038 struct ata_device *dev; 3039 struct scsi_device *scsidev = cmd->device; 3040 struct Scsi_Host *shost = scsidev->host; 3041 int rc = 0; 3042 3043 ap = ata_shost_to_port(shost); 3044 3045 spin_unlock(shost->host_lock); 3046 spin_lock(ap->lock); 3047 3048 ata_scsi_dump_cdb(ap, cmd); 3049 3050 dev = ata_scsi_find_dev(ap, scsidev); 3051 if (likely(dev)) 3052 rc = __ata_scsi_queuecmd(cmd, done, dev); 3053 else { 3054 cmd->result = (DID_BAD_TARGET << 16); 3055 done(cmd); 3056 } 3057 3058 spin_unlock(ap->lock); 3059 spin_lock(shost->host_lock); 3060 return rc; 3061 } 3062 3063 /** 3064 * ata_scsi_simulate - simulate SCSI command on ATA device 3065 * @dev: the target device 3066 * @cmd: SCSI command being sent to device. 3067 * @done: SCSI command completion function. 3068 * 3069 * Interprets and directly executes a select list of SCSI commands 3070 * that can be handled internally. 3071 * 3072 * LOCKING: 3073 * spin_lock_irqsave(host lock) 3074 */ 3075 3076 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3077 void (*done)(struct scsi_cmnd *)) 3078 { 3079 struct ata_scsi_args args; 3080 const u8 *scsicmd = cmd->cmnd; 3081 u8 tmp8; 3082 3083 args.dev = dev; 3084 args.id = dev->id; 3085 args.cmd = cmd; 3086 args.done = done; 3087 3088 switch(scsicmd[0]) { 3089 /* TODO: worth improving? */ 3090 case FORMAT_UNIT: 3091 ata_scsi_invalid_field(cmd, done); 3092 break; 3093 3094 case INQUIRY: 3095 if (scsicmd[1] & 2) /* is CmdDt set? */ 3096 ata_scsi_invalid_field(cmd, done); 3097 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3098 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3099 else switch (scsicmd[2]) { 3100 case 0x00: 3101 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3102 break; 3103 case 0x80: 3104 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3105 break; 3106 case 0x83: 3107 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3108 break; 3109 case 0x89: 3110 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3111 break; 3112 case 0xb1: 3113 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3114 break; 3115 default: 3116 ata_scsi_invalid_field(cmd, done); 3117 break; 3118 } 3119 break; 3120 3121 case MODE_SENSE: 3122 case MODE_SENSE_10: 3123 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3124 break; 3125 3126 case MODE_SELECT: /* unconditionally return */ 3127 case MODE_SELECT_10: /* bad-field-in-cdb */ 3128 ata_scsi_invalid_field(cmd, done); 3129 break; 3130 3131 case READ_CAPACITY: 3132 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3133 break; 3134 3135 case SERVICE_ACTION_IN: 3136 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3137 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3138 else 3139 ata_scsi_invalid_field(cmd, done); 3140 break; 3141 3142 case REPORT_LUNS: 3143 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3144 break; 3145 3146 case REQUEST_SENSE: 3147 ata_scsi_set_sense(cmd, 0, 0, 0); 3148 cmd->result = (DRIVER_SENSE << 24); 3149 done(cmd); 3150 break; 3151 3152 /* if we reach this, then writeback caching is disabled, 3153 * turning this into a no-op. 3154 */ 3155 case SYNCHRONIZE_CACHE: 3156 /* fall through */ 3157 3158 /* no-op's, complete with success */ 3159 case REZERO_UNIT: 3160 case SEEK_6: 3161 case SEEK_10: 3162 case TEST_UNIT_READY: 3163 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3164 break; 3165 3166 case SEND_DIAGNOSTIC: 3167 tmp8 = scsicmd[1] & ~(1 << 3); 3168 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3169 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3170 else 3171 ata_scsi_invalid_field(cmd, done); 3172 break; 3173 3174 /* all other commands */ 3175 default: 3176 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3177 /* "Invalid command operation code" */ 3178 done(cmd); 3179 break; 3180 } 3181 } 3182 3183 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3184 { 3185 int i, rc; 3186 3187 for (i = 0; i < host->n_ports; i++) { 3188 struct ata_port *ap = host->ports[i]; 3189 struct Scsi_Host *shost; 3190 3191 rc = -ENOMEM; 3192 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3193 if (!shost) 3194 goto err_alloc; 3195 3196 *(struct ata_port **)&shost->hostdata[0] = ap; 3197 ap->scsi_host = shost; 3198 3199 shost->transportt = &ata_scsi_transport_template; 3200 shost->unique_id = ap->print_id; 3201 shost->max_id = 16; 3202 shost->max_lun = 1; 3203 shost->max_channel = 1; 3204 shost->max_cmd_len = 16; 3205 3206 /* Schedule policy is determined by ->qc_defer() 3207 * callback and it needs to see every deferred qc. 3208 * Set host_blocked to 1 to prevent SCSI midlayer from 3209 * automatically deferring requests. 3210 */ 3211 shost->max_host_blocked = 1; 3212 3213 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3214 if (rc) 3215 goto err_add; 3216 } 3217 3218 return 0; 3219 3220 err_add: 3221 scsi_host_put(host->ports[i]->scsi_host); 3222 err_alloc: 3223 while (--i >= 0) { 3224 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3225 3226 scsi_remove_host(shost); 3227 scsi_host_put(shost); 3228 } 3229 return rc; 3230 } 3231 3232 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3233 { 3234 int tries = 5; 3235 struct ata_device *last_failed_dev = NULL; 3236 struct ata_link *link; 3237 struct ata_device *dev; 3238 3239 if (ap->flags & ATA_FLAG_DISABLED) 3240 return; 3241 3242 repeat: 3243 ata_for_each_link(link, ap, EDGE) { 3244 ata_for_each_dev(dev, link, ENABLED) { 3245 struct scsi_device *sdev; 3246 int channel = 0, id = 0; 3247 3248 if (dev->sdev) 3249 continue; 3250 3251 if (ata_is_host_link(link)) 3252 id = dev->devno; 3253 else 3254 channel = link->pmp; 3255 3256 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3257 NULL); 3258 if (!IS_ERR(sdev)) { 3259 dev->sdev = sdev; 3260 scsi_device_put(sdev); 3261 } 3262 } 3263 } 3264 3265 /* If we scanned while EH was in progress or allocation 3266 * failure occurred, scan would have failed silently. Check 3267 * whether all devices are attached. 3268 */ 3269 ata_for_each_link(link, ap, EDGE) { 3270 ata_for_each_dev(dev, link, ENABLED) { 3271 if (!dev->sdev) 3272 goto exit_loop; 3273 } 3274 } 3275 exit_loop: 3276 if (!link) 3277 return; 3278 3279 /* we're missing some SCSI devices */ 3280 if (sync) { 3281 /* If caller requested synchrnous scan && we've made 3282 * any progress, sleep briefly and repeat. 3283 */ 3284 if (dev != last_failed_dev) { 3285 msleep(100); 3286 last_failed_dev = dev; 3287 goto repeat; 3288 } 3289 3290 /* We might be failing to detect boot device, give it 3291 * a few more chances. 3292 */ 3293 if (--tries) { 3294 msleep(100); 3295 goto repeat; 3296 } 3297 3298 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3299 "failed without making any progress,\n" 3300 " switching to async\n"); 3301 } 3302 3303 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3304 round_jiffies_relative(HZ)); 3305 } 3306 3307 /** 3308 * ata_scsi_offline_dev - offline attached SCSI device 3309 * @dev: ATA device to offline attached SCSI device for 3310 * 3311 * This function is called from ata_eh_hotplug() and responsible 3312 * for taking the SCSI device attached to @dev offline. This 3313 * function is called with host lock which protects dev->sdev 3314 * against clearing. 3315 * 3316 * LOCKING: 3317 * spin_lock_irqsave(host lock) 3318 * 3319 * RETURNS: 3320 * 1 if attached SCSI device exists, 0 otherwise. 3321 */ 3322 int ata_scsi_offline_dev(struct ata_device *dev) 3323 { 3324 if (dev->sdev) { 3325 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3326 return 1; 3327 } 3328 return 0; 3329 } 3330 3331 /** 3332 * ata_scsi_remove_dev - remove attached SCSI device 3333 * @dev: ATA device to remove attached SCSI device for 3334 * 3335 * This function is called from ata_eh_scsi_hotplug() and 3336 * responsible for removing the SCSI device attached to @dev. 3337 * 3338 * LOCKING: 3339 * Kernel thread context (may sleep). 3340 */ 3341 static void ata_scsi_remove_dev(struct ata_device *dev) 3342 { 3343 struct ata_port *ap = dev->link->ap; 3344 struct scsi_device *sdev; 3345 unsigned long flags; 3346 3347 /* Alas, we need to grab scan_mutex to ensure SCSI device 3348 * state doesn't change underneath us and thus 3349 * scsi_device_get() always succeeds. The mutex locking can 3350 * be removed if there is __scsi_device_get() interface which 3351 * increments reference counts regardless of device state. 3352 */ 3353 mutex_lock(&ap->scsi_host->scan_mutex); 3354 spin_lock_irqsave(ap->lock, flags); 3355 3356 /* clearing dev->sdev is protected by host lock */ 3357 sdev = dev->sdev; 3358 dev->sdev = NULL; 3359 3360 if (sdev) { 3361 /* If user initiated unplug races with us, sdev can go 3362 * away underneath us after the host lock and 3363 * scan_mutex are released. Hold onto it. 3364 */ 3365 if (scsi_device_get(sdev) == 0) { 3366 /* The following ensures the attached sdev is 3367 * offline on return from ata_scsi_offline_dev() 3368 * regardless it wins or loses the race 3369 * against this function. 3370 */ 3371 scsi_device_set_state(sdev, SDEV_OFFLINE); 3372 } else { 3373 WARN_ON(1); 3374 sdev = NULL; 3375 } 3376 } 3377 3378 spin_unlock_irqrestore(ap->lock, flags); 3379 mutex_unlock(&ap->scsi_host->scan_mutex); 3380 3381 if (sdev) { 3382 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3383 dev_name(&sdev->sdev_gendev)); 3384 3385 scsi_remove_device(sdev); 3386 scsi_device_put(sdev); 3387 } 3388 } 3389 3390 static void ata_scsi_handle_link_detach(struct ata_link *link) 3391 { 3392 struct ata_port *ap = link->ap; 3393 struct ata_device *dev; 3394 3395 ata_for_each_dev(dev, link, ALL) { 3396 unsigned long flags; 3397 3398 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3399 continue; 3400 3401 spin_lock_irqsave(ap->lock, flags); 3402 dev->flags &= ~ATA_DFLAG_DETACHED; 3403 spin_unlock_irqrestore(ap->lock, flags); 3404 3405 ata_scsi_remove_dev(dev); 3406 } 3407 } 3408 3409 /** 3410 * ata_scsi_media_change_notify - send media change event 3411 * @dev: Pointer to the disk device with media change event 3412 * 3413 * Tell the block layer to send a media change notification 3414 * event. 3415 * 3416 * LOCKING: 3417 * spin_lock_irqsave(host lock) 3418 */ 3419 void ata_scsi_media_change_notify(struct ata_device *dev) 3420 { 3421 if (dev->sdev) 3422 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3423 GFP_ATOMIC); 3424 } 3425 3426 /** 3427 * ata_scsi_hotplug - SCSI part of hotplug 3428 * @work: Pointer to ATA port to perform SCSI hotplug on 3429 * 3430 * Perform SCSI part of hotplug. It's executed from a separate 3431 * workqueue after EH completes. This is necessary because SCSI 3432 * hot plugging requires working EH and hot unplugging is 3433 * synchronized with hot plugging with a mutex. 3434 * 3435 * LOCKING: 3436 * Kernel thread context (may sleep). 3437 */ 3438 void ata_scsi_hotplug(struct work_struct *work) 3439 { 3440 struct ata_port *ap = 3441 container_of(work, struct ata_port, hotplug_task.work); 3442 int i; 3443 3444 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3445 DPRINTK("ENTER/EXIT - unloading\n"); 3446 return; 3447 } 3448 3449 DPRINTK("ENTER\n"); 3450 3451 /* Unplug detached devices. We cannot use link iterator here 3452 * because PMP links have to be scanned even if PMP is 3453 * currently not attached. Iterate manually. 3454 */ 3455 ata_scsi_handle_link_detach(&ap->link); 3456 if (ap->pmp_link) 3457 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3458 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3459 3460 /* scan for new ones */ 3461 ata_scsi_scan_host(ap, 0); 3462 3463 DPRINTK("EXIT\n"); 3464 } 3465 3466 /** 3467 * ata_scsi_user_scan - indication for user-initiated bus scan 3468 * @shost: SCSI host to scan 3469 * @channel: Channel to scan 3470 * @id: ID to scan 3471 * @lun: LUN to scan 3472 * 3473 * This function is called when user explicitly requests bus 3474 * scan. Set probe pending flag and invoke EH. 3475 * 3476 * LOCKING: 3477 * SCSI layer (we don't care) 3478 * 3479 * RETURNS: 3480 * Zero. 3481 */ 3482 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3483 unsigned int id, unsigned int lun) 3484 { 3485 struct ata_port *ap = ata_shost_to_port(shost); 3486 unsigned long flags; 3487 int devno, rc = 0; 3488 3489 if (!ap->ops->error_handler) 3490 return -EOPNOTSUPP; 3491 3492 if (lun != SCAN_WILD_CARD && lun) 3493 return -EINVAL; 3494 3495 if (!sata_pmp_attached(ap)) { 3496 if (channel != SCAN_WILD_CARD && channel) 3497 return -EINVAL; 3498 devno = id; 3499 } else { 3500 if (id != SCAN_WILD_CARD && id) 3501 return -EINVAL; 3502 devno = channel; 3503 } 3504 3505 spin_lock_irqsave(ap->lock, flags); 3506 3507 if (devno == SCAN_WILD_CARD) { 3508 struct ata_link *link; 3509 3510 ata_for_each_link(link, ap, EDGE) { 3511 struct ata_eh_info *ehi = &link->eh_info; 3512 ehi->probe_mask |= ATA_ALL_DEVICES; 3513 ehi->action |= ATA_EH_RESET; 3514 } 3515 } else { 3516 struct ata_device *dev = ata_find_dev(ap, devno); 3517 3518 if (dev) { 3519 struct ata_eh_info *ehi = &dev->link->eh_info; 3520 ehi->probe_mask |= 1 << dev->devno; 3521 ehi->action |= ATA_EH_RESET; 3522 } else 3523 rc = -EINVAL; 3524 } 3525 3526 if (rc == 0) { 3527 ata_port_schedule_eh(ap); 3528 spin_unlock_irqrestore(ap->lock, flags); 3529 ata_port_wait_eh(ap); 3530 } else 3531 spin_unlock_irqrestore(ap->lock, flags); 3532 3533 return rc; 3534 } 3535 3536 /** 3537 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3538 * @work: Pointer to ATA port to perform scsi_rescan_device() 3539 * 3540 * After ATA pass thru (SAT) commands are executed successfully, 3541 * libata need to propagate the changes to SCSI layer. This 3542 * function must be executed from ata_aux_wq such that sdev 3543 * attach/detach don't race with rescan. 3544 * 3545 * LOCKING: 3546 * Kernel thread context (may sleep). 3547 */ 3548 void ata_scsi_dev_rescan(struct work_struct *work) 3549 { 3550 struct ata_port *ap = 3551 container_of(work, struct ata_port, scsi_rescan_task); 3552 struct ata_link *link; 3553 struct ata_device *dev; 3554 unsigned long flags; 3555 3556 spin_lock_irqsave(ap->lock, flags); 3557 3558 ata_for_each_link(link, ap, EDGE) { 3559 ata_for_each_dev(dev, link, ENABLED) { 3560 struct scsi_device *sdev = dev->sdev; 3561 3562 if (!sdev) 3563 continue; 3564 if (scsi_device_get(sdev)) 3565 continue; 3566 3567 spin_unlock_irqrestore(ap->lock, flags); 3568 scsi_rescan_device(&(sdev->sdev_gendev)); 3569 scsi_device_put(sdev); 3570 spin_lock_irqsave(ap->lock, flags); 3571 } 3572 } 3573 3574 spin_unlock_irqrestore(ap->lock, flags); 3575 } 3576 3577 /** 3578 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3579 * @host: ATA host container for all SAS ports 3580 * @port_info: Information from low-level host driver 3581 * @shost: SCSI host that the scsi device is attached to 3582 * 3583 * LOCKING: 3584 * PCI/etc. bus probe sem. 3585 * 3586 * RETURNS: 3587 * ata_port pointer on success / NULL on failure. 3588 */ 3589 3590 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3591 struct ata_port_info *port_info, 3592 struct Scsi_Host *shost) 3593 { 3594 struct ata_port *ap; 3595 3596 ap = ata_port_alloc(host); 3597 if (!ap) 3598 return NULL; 3599 3600 ap->port_no = 0; 3601 ap->lock = shost->host_lock; 3602 ap->pio_mask = port_info->pio_mask; 3603 ap->mwdma_mask = port_info->mwdma_mask; 3604 ap->udma_mask = port_info->udma_mask; 3605 ap->flags |= port_info->flags; 3606 ap->ops = port_info->port_ops; 3607 ap->cbl = ATA_CBL_SATA; 3608 3609 return ap; 3610 } 3611 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3612 3613 /** 3614 * ata_sas_port_start - Set port up for dma. 3615 * @ap: Port to initialize 3616 * 3617 * Called just after data structures for each port are 3618 * initialized. 3619 * 3620 * May be used as the port_start() entry in ata_port_operations. 3621 * 3622 * LOCKING: 3623 * Inherited from caller. 3624 */ 3625 int ata_sas_port_start(struct ata_port *ap) 3626 { 3627 return 0; 3628 } 3629 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3630 3631 /** 3632 * ata_port_stop - Undo ata_sas_port_start() 3633 * @ap: Port to shut down 3634 * 3635 * May be used as the port_stop() entry in ata_port_operations. 3636 * 3637 * LOCKING: 3638 * Inherited from caller. 3639 */ 3640 3641 void ata_sas_port_stop(struct ata_port *ap) 3642 { 3643 } 3644 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3645 3646 /** 3647 * ata_sas_port_init - Initialize a SATA device 3648 * @ap: SATA port to initialize 3649 * 3650 * LOCKING: 3651 * PCI/etc. bus probe sem. 3652 * 3653 * RETURNS: 3654 * Zero on success, non-zero on error. 3655 */ 3656 3657 int ata_sas_port_init(struct ata_port *ap) 3658 { 3659 int rc = ap->ops->port_start(ap); 3660 3661 if (!rc) { 3662 ap->print_id = ata_print_id++; 3663 rc = ata_bus_probe(ap); 3664 } 3665 3666 return rc; 3667 } 3668 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3669 3670 /** 3671 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3672 * @ap: SATA port to destroy 3673 * 3674 */ 3675 3676 void ata_sas_port_destroy(struct ata_port *ap) 3677 { 3678 if (ap->ops->port_stop) 3679 ap->ops->port_stop(ap); 3680 kfree(ap); 3681 } 3682 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3683 3684 /** 3685 * ata_sas_slave_configure - Default slave_config routine for libata devices 3686 * @sdev: SCSI device to configure 3687 * @ap: ATA port to which SCSI device is attached 3688 * 3689 * RETURNS: 3690 * Zero. 3691 */ 3692 3693 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3694 { 3695 ata_scsi_sdev_config(sdev); 3696 ata_scsi_dev_config(sdev, ap->link.device); 3697 return 0; 3698 } 3699 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3700 3701 /** 3702 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3703 * @cmd: SCSI command to be sent 3704 * @done: Completion function, called when command is complete 3705 * @ap: ATA port to which the command is being sent 3706 * 3707 * RETURNS: 3708 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3709 * 0 otherwise. 3710 */ 3711 3712 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3713 struct ata_port *ap) 3714 { 3715 int rc = 0; 3716 3717 ata_scsi_dump_cdb(ap, cmd); 3718 3719 if (likely(ata_dev_enabled(ap->link.device))) 3720 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3721 else { 3722 cmd->result = (DID_BAD_TARGET << 16); 3723 done(cmd); 3724 } 3725 return rc; 3726 } 3727 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3728