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/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <scsi/scsi.h> 41 #include <scsi/scsi_host.h> 42 #include <scsi/scsi_cmnd.h> 43 #include <scsi/scsi_eh.h> 44 #include <scsi/scsi_device.h> 45 #include <scsi/scsi_tcq.h> 46 #include <scsi/scsi_transport.h> 47 #include <linux/libata.h> 48 #include <linux/hdreg.h> 49 #include <linux/uaccess.h> 50 #include <linux/suspend.h> 51 #include <asm/unaligned.h> 52 53 #include "libata.h" 54 55 #define SECTOR_SIZE 512 56 #define ATA_SCSI_RBUF_SIZE 4096 57 58 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 59 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 60 61 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 62 63 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 64 const struct scsi_device *scsidev); 65 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 66 const struct scsi_device *scsidev); 67 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 68 unsigned int id, unsigned int lun); 69 70 71 #define RW_RECOVERY_MPAGE 0x1 72 #define RW_RECOVERY_MPAGE_LEN 12 73 #define CACHE_MPAGE 0x8 74 #define CACHE_MPAGE_LEN 20 75 #define CONTROL_MPAGE 0xa 76 #define CONTROL_MPAGE_LEN 12 77 #define ALL_MPAGES 0x3f 78 #define ALL_SUB_MPAGES 0xff 79 80 81 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 82 RW_RECOVERY_MPAGE, 83 RW_RECOVERY_MPAGE_LEN - 2, 84 (1 << 7), /* AWRE */ 85 0, /* read retry count */ 86 0, 0, 0, 0, 87 0, /* write retry count */ 88 0, 0, 0 89 }; 90 91 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 92 CACHE_MPAGE, 93 CACHE_MPAGE_LEN - 2, 94 0, /* contains WCE, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0, 0, 0, 96 0, /* contains DRA, needs to be 0 for logic */ 97 0, 0, 0, 0, 0, 0, 0 98 }; 99 100 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 101 CONTROL_MPAGE, 102 CONTROL_MPAGE_LEN - 2, 103 2, /* DSENSE=0, GLTSD=1 */ 104 0, /* [QAM+QERR may be 1, see 05-359r1] */ 105 0, 0, 0, 0, 0xff, 0xff, 106 0, 30 /* extended self test time, see 05-359r1 */ 107 }; 108 109 /* 110 * libata transport template. libata doesn't do real transport stuff. 111 * It just needs the eh_timed_out hook. 112 */ 113 static struct scsi_transport_template ata_scsi_transport_template = { 114 .eh_strategy_handler = ata_scsi_error, 115 .eh_timed_out = ata_scsi_timed_out, 116 .user_scan = ata_scsi_user_scan, 117 }; 118 119 120 static const struct { 121 enum link_pm value; 122 const char *name; 123 } link_pm_policy[] = { 124 { NOT_AVAILABLE, "max_performance" }, 125 { MIN_POWER, "min_power" }, 126 { MAX_PERFORMANCE, "max_performance" }, 127 { MEDIUM_POWER, "medium_power" }, 128 }; 129 130 static const char *ata_scsi_lpm_get(enum link_pm policy) 131 { 132 int i; 133 134 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++) 135 if (link_pm_policy[i].value == policy) 136 return link_pm_policy[i].name; 137 138 return NULL; 139 } 140 141 static ssize_t ata_scsi_lpm_put(struct device *dev, 142 struct device_attribute *attr, 143 const char *buf, size_t count) 144 { 145 struct Scsi_Host *shost = class_to_shost(dev); 146 struct ata_port *ap = ata_shost_to_port(shost); 147 enum link_pm policy = 0; 148 int i; 149 150 /* 151 * we are skipping array location 0 on purpose - this 152 * is because a value of NOT_AVAILABLE is displayed 153 * to the user as max_performance, but when the user 154 * writes "max_performance", they actually want the 155 * value to match MAX_PERFORMANCE. 156 */ 157 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) { 158 const int len = strlen(link_pm_policy[i].name); 159 if (strncmp(link_pm_policy[i].name, buf, len) == 0) { 160 policy = link_pm_policy[i].value; 161 break; 162 } 163 } 164 if (!policy) 165 return -EINVAL; 166 167 ata_lpm_schedule(ap, policy); 168 return count; 169 } 170 171 static ssize_t 172 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf) 173 { 174 struct Scsi_Host *shost = class_to_shost(dev); 175 struct ata_port *ap = ata_shost_to_port(shost); 176 const char *policy = 177 ata_scsi_lpm_get(ap->pm_policy); 178 179 if (!policy) 180 return -EINVAL; 181 182 return snprintf(buf, 23, "%s\n", policy); 183 } 184 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 185 ata_scsi_lpm_show, ata_scsi_lpm_put); 186 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 187 188 static ssize_t ata_scsi_park_show(struct device *device, 189 struct device_attribute *attr, char *buf) 190 { 191 struct scsi_device *sdev = to_scsi_device(device); 192 struct ata_port *ap; 193 struct ata_link *link; 194 struct ata_device *dev; 195 unsigned long flags, now; 196 unsigned int uninitialized_var(msecs); 197 int rc = 0; 198 199 ap = ata_shost_to_port(sdev->host); 200 201 spin_lock_irqsave(ap->lock, flags); 202 dev = ata_scsi_find_dev(ap, sdev); 203 if (!dev) { 204 rc = -ENODEV; 205 goto unlock; 206 } 207 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 208 rc = -EOPNOTSUPP; 209 goto unlock; 210 } 211 212 link = dev->link; 213 now = jiffies; 214 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 215 link->eh_context.unloaded_mask & (1 << dev->devno) && 216 time_after(dev->unpark_deadline, now)) 217 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 218 else 219 msecs = 0; 220 221 unlock: 222 spin_unlock_irq(ap->lock); 223 224 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 225 } 226 227 static ssize_t ata_scsi_park_store(struct device *device, 228 struct device_attribute *attr, 229 const char *buf, size_t len) 230 { 231 struct scsi_device *sdev = to_scsi_device(device); 232 struct ata_port *ap; 233 struct ata_device *dev; 234 long int input; 235 unsigned long flags; 236 int rc; 237 238 rc = strict_strtol(buf, 10, &input); 239 if (rc || input < -2) 240 return -EINVAL; 241 if (input > ATA_TMOUT_MAX_PARK) { 242 rc = -EOVERFLOW; 243 input = ATA_TMOUT_MAX_PARK; 244 } 245 246 ap = ata_shost_to_port(sdev->host); 247 248 spin_lock_irqsave(ap->lock, flags); 249 dev = ata_scsi_find_dev(ap, sdev); 250 if (unlikely(!dev)) { 251 rc = -ENODEV; 252 goto unlock; 253 } 254 if (dev->class != ATA_DEV_ATA) { 255 rc = -EOPNOTSUPP; 256 goto unlock; 257 } 258 259 if (input >= 0) { 260 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 261 rc = -EOPNOTSUPP; 262 goto unlock; 263 } 264 265 dev->unpark_deadline = ata_deadline(jiffies, input); 266 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 267 ata_port_schedule_eh(ap); 268 complete(&ap->park_req_pending); 269 } else { 270 switch (input) { 271 case -1: 272 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 273 break; 274 case -2: 275 dev->flags |= ATA_DFLAG_NO_UNLOAD; 276 break; 277 } 278 } 279 unlock: 280 spin_unlock_irqrestore(ap->lock, flags); 281 282 return rc ? rc : len; 283 } 284 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 285 ata_scsi_park_show, ata_scsi_park_store); 286 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 287 288 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 289 { 290 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 291 292 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 293 } 294 295 static ssize_t 296 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 297 const char *buf, size_t count) 298 { 299 struct Scsi_Host *shost = class_to_shost(dev); 300 struct ata_port *ap = ata_shost_to_port(shost); 301 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 302 return ap->ops->em_store(ap, buf, count); 303 return -EINVAL; 304 } 305 306 static ssize_t 307 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct Scsi_Host *shost = class_to_shost(dev); 311 struct ata_port *ap = ata_shost_to_port(shost); 312 313 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 314 return ap->ops->em_show(ap, buf); 315 return -EINVAL; 316 } 317 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 318 ata_scsi_em_message_show, ata_scsi_em_message_store); 319 EXPORT_SYMBOL_GPL(dev_attr_em_message); 320 321 static ssize_t 322 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 323 char *buf) 324 { 325 struct Scsi_Host *shost = class_to_shost(dev); 326 struct ata_port *ap = ata_shost_to_port(shost); 327 328 return snprintf(buf, 23, "%d\n", ap->em_message_type); 329 } 330 DEVICE_ATTR(em_message_type, S_IRUGO, 331 ata_scsi_em_message_type_show, NULL); 332 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 333 334 static ssize_t 335 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 336 char *buf) 337 { 338 struct scsi_device *sdev = to_scsi_device(dev); 339 struct ata_port *ap = ata_shost_to_port(sdev->host); 340 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 341 342 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY)) 343 return ap->ops->sw_activity_show(atadev, buf); 344 return -EINVAL; 345 } 346 347 static ssize_t 348 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 349 const char *buf, size_t count) 350 { 351 struct scsi_device *sdev = to_scsi_device(dev); 352 struct ata_port *ap = ata_shost_to_port(sdev->host); 353 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 354 enum sw_activity val; 355 int rc; 356 357 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 358 val = simple_strtoul(buf, NULL, 0); 359 switch (val) { 360 case OFF: case BLINK_ON: case BLINK_OFF: 361 rc = ap->ops->sw_activity_store(atadev, val); 362 if (!rc) 363 return count; 364 else 365 return rc; 366 } 367 } 368 return -EINVAL; 369 } 370 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 371 ata_scsi_activity_store); 372 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 373 374 struct device_attribute *ata_common_sdev_attrs[] = { 375 &dev_attr_unload_heads, 376 NULL 377 }; 378 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 379 380 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 381 void (*done)(struct scsi_cmnd *)) 382 { 383 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 384 /* "Invalid field in cbd" */ 385 done(cmd); 386 } 387 388 /** 389 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 390 * @sdev: SCSI device for which BIOS geometry is to be determined 391 * @bdev: block device associated with @sdev 392 * @capacity: capacity of SCSI device 393 * @geom: location to which geometry will be output 394 * 395 * Generic bios head/sector/cylinder calculator 396 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 397 * mapping. Some situations may arise where the disk is not 398 * bootable if this is not used. 399 * 400 * LOCKING: 401 * Defined by the SCSI layer. We don't really care. 402 * 403 * RETURNS: 404 * Zero. 405 */ 406 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 407 sector_t capacity, int geom[]) 408 { 409 geom[0] = 255; 410 geom[1] = 63; 411 sector_div(capacity, 255*63); 412 geom[2] = capacity; 413 414 return 0; 415 } 416 417 /** 418 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 419 * @ap: target port 420 * @sdev: SCSI device to get identify data for 421 * @arg: User buffer area for identify data 422 * 423 * LOCKING: 424 * Defined by the SCSI layer. We don't really care. 425 * 426 * RETURNS: 427 * Zero on success, negative errno on error. 428 */ 429 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 430 void __user *arg) 431 { 432 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 433 u16 __user *dst = arg; 434 char buf[40]; 435 436 if (!dev) 437 return -ENOMSG; 438 439 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 440 return -EFAULT; 441 442 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 443 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 444 return -EFAULT; 445 446 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 447 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 448 return -EFAULT; 449 450 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 451 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 452 return -EFAULT; 453 454 return 0; 455 } 456 457 /** 458 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 459 * @scsidev: Device to which we are issuing command 460 * @arg: User provided data for issuing command 461 * 462 * LOCKING: 463 * Defined by the SCSI layer. We don't really care. 464 * 465 * RETURNS: 466 * Zero on success, negative errno on error. 467 */ 468 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 469 { 470 int rc = 0; 471 u8 scsi_cmd[MAX_COMMAND_SIZE]; 472 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 473 int argsize = 0; 474 enum dma_data_direction data_dir; 475 int cmd_result; 476 477 if (arg == NULL) 478 return -EINVAL; 479 480 if (copy_from_user(args, arg, sizeof(args))) 481 return -EFAULT; 482 483 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 484 if (!sensebuf) 485 return -ENOMEM; 486 487 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 488 489 if (args[3]) { 490 argsize = SECTOR_SIZE * args[3]; 491 argbuf = kmalloc(argsize, GFP_KERNEL); 492 if (argbuf == NULL) { 493 rc = -ENOMEM; 494 goto error; 495 } 496 497 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 498 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 499 block count in sector count field */ 500 data_dir = DMA_FROM_DEVICE; 501 } else { 502 scsi_cmd[1] = (3 << 1); /* Non-data */ 503 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 504 data_dir = DMA_NONE; 505 } 506 507 scsi_cmd[0] = ATA_16; 508 509 scsi_cmd[4] = args[2]; 510 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 511 scsi_cmd[6] = args[3]; 512 scsi_cmd[8] = args[1]; 513 scsi_cmd[10] = 0x4f; 514 scsi_cmd[12] = 0xc2; 515 } else { 516 scsi_cmd[6] = args[1]; 517 } 518 scsi_cmd[14] = args[0]; 519 520 /* Good values for timeout and retries? Values below 521 from scsi_ioctl_send_command() for default case... */ 522 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 523 sensebuf, (10*HZ), 5, 0, NULL); 524 525 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 526 u8 *desc = sensebuf + 8; 527 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 528 529 /* If we set cc then ATA pass-through will cause a 530 * check condition even if no error. Filter that. */ 531 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 532 struct scsi_sense_hdr sshdr; 533 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 534 &sshdr); 535 if (sshdr.sense_key == 0 && 536 sshdr.asc == 0 && sshdr.ascq == 0) 537 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 538 } 539 540 /* Send userspace a few ATA registers (same as drivers/ide) */ 541 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 542 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 543 args[0] = desc[13]; /* status */ 544 args[1] = desc[3]; /* error */ 545 args[2] = desc[5]; /* sector count (0:7) */ 546 if (copy_to_user(arg, args, sizeof(args))) 547 rc = -EFAULT; 548 } 549 } 550 551 552 if (cmd_result) { 553 rc = -EIO; 554 goto error; 555 } 556 557 if ((argbuf) 558 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 559 rc = -EFAULT; 560 error: 561 kfree(sensebuf); 562 kfree(argbuf); 563 return rc; 564 } 565 566 /** 567 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 568 * @scsidev: Device to which we are issuing command 569 * @arg: User provided data for issuing command 570 * 571 * LOCKING: 572 * Defined by the SCSI layer. We don't really care. 573 * 574 * RETURNS: 575 * Zero on success, negative errno on error. 576 */ 577 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 578 { 579 int rc = 0; 580 u8 scsi_cmd[MAX_COMMAND_SIZE]; 581 u8 args[7], *sensebuf = NULL; 582 int cmd_result; 583 584 if (arg == NULL) 585 return -EINVAL; 586 587 if (copy_from_user(args, arg, sizeof(args))) 588 return -EFAULT; 589 590 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 591 if (!sensebuf) 592 return -ENOMEM; 593 594 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 595 scsi_cmd[0] = ATA_16; 596 scsi_cmd[1] = (3 << 1); /* Non-data */ 597 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 598 scsi_cmd[4] = args[1]; 599 scsi_cmd[6] = args[2]; 600 scsi_cmd[8] = args[3]; 601 scsi_cmd[10] = args[4]; 602 scsi_cmd[12] = args[5]; 603 scsi_cmd[13] = args[6] & 0x4f; 604 scsi_cmd[14] = args[0]; 605 606 /* Good values for timeout and retries? Values below 607 from scsi_ioctl_send_command() for default case... */ 608 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 609 sensebuf, (10*HZ), 5, 0, NULL); 610 611 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 612 u8 *desc = sensebuf + 8; 613 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 614 615 /* If we set cc then ATA pass-through will cause a 616 * check condition even if no error. Filter that. */ 617 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 618 struct scsi_sense_hdr sshdr; 619 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 620 &sshdr); 621 if (sshdr.sense_key == 0 && 622 sshdr.asc == 0 && sshdr.ascq == 0) 623 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 624 } 625 626 /* Send userspace ATA registers */ 627 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 628 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 629 args[0] = desc[13]; /* status */ 630 args[1] = desc[3]; /* error */ 631 args[2] = desc[5]; /* sector count (0:7) */ 632 args[3] = desc[7]; /* lbal */ 633 args[4] = desc[9]; /* lbam */ 634 args[5] = desc[11]; /* lbah */ 635 args[6] = desc[12]; /* select */ 636 if (copy_to_user(arg, args, sizeof(args))) 637 rc = -EFAULT; 638 } 639 } 640 641 if (cmd_result) { 642 rc = -EIO; 643 goto error; 644 } 645 646 error: 647 kfree(sensebuf); 648 return rc; 649 } 650 651 static int ata_ioc32(struct ata_port *ap) 652 { 653 if (ap->flags & ATA_FLAG_PIO_DMA) 654 return 1; 655 if (ap->pflags & ATA_PFLAG_PIO32) 656 return 1; 657 return 0; 658 } 659 660 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 661 int cmd, void __user *arg) 662 { 663 int val = -EINVAL, rc = -EINVAL; 664 unsigned long flags; 665 666 switch (cmd) { 667 case ATA_IOC_GET_IO32: 668 spin_lock_irqsave(ap->lock, flags); 669 val = ata_ioc32(ap); 670 spin_unlock_irqrestore(ap->lock, flags); 671 if (copy_to_user(arg, &val, 1)) 672 return -EFAULT; 673 return 0; 674 675 case ATA_IOC_SET_IO32: 676 val = (unsigned long) arg; 677 rc = 0; 678 spin_lock_irqsave(ap->lock, flags); 679 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 680 if (val) 681 ap->pflags |= ATA_PFLAG_PIO32; 682 else 683 ap->pflags &= ~ATA_PFLAG_PIO32; 684 } else { 685 if (val != ata_ioc32(ap)) 686 rc = -EINVAL; 687 } 688 spin_unlock_irqrestore(ap->lock, flags); 689 return rc; 690 691 case HDIO_GET_IDENTITY: 692 return ata_get_identity(ap, scsidev, arg); 693 694 case HDIO_DRIVE_CMD: 695 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 696 return -EACCES; 697 return ata_cmd_ioctl(scsidev, arg); 698 699 case HDIO_DRIVE_TASK: 700 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 701 return -EACCES; 702 return ata_task_ioctl(scsidev, arg); 703 704 default: 705 rc = -ENOTTY; 706 break; 707 } 708 709 return rc; 710 } 711 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 712 713 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 714 { 715 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 716 scsidev, cmd, arg); 717 } 718 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 719 720 /** 721 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 722 * @dev: ATA device to which the new command is attached 723 * @cmd: SCSI command that originated this ATA command 724 * @done: SCSI command completion function 725 * 726 * Obtain a reference to an unused ata_queued_cmd structure, 727 * which is the basic libata structure representing a single 728 * ATA command sent to the hardware. 729 * 730 * If a command was available, fill in the SCSI-specific 731 * portions of the structure with information on the 732 * current command. 733 * 734 * LOCKING: 735 * spin_lock_irqsave(host lock) 736 * 737 * RETURNS: 738 * Command allocated, or %NULL if none available. 739 */ 740 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 741 struct scsi_cmnd *cmd, 742 void (*done)(struct scsi_cmnd *)) 743 { 744 struct ata_queued_cmd *qc; 745 746 qc = ata_qc_new_init(dev); 747 if (qc) { 748 qc->scsicmd = cmd; 749 qc->scsidone = done; 750 751 qc->sg = scsi_sglist(cmd); 752 qc->n_elem = scsi_sg_count(cmd); 753 } else { 754 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 755 done(cmd); 756 } 757 758 return qc; 759 } 760 761 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 762 { 763 struct scsi_cmnd *scmd = qc->scsicmd; 764 765 qc->extrabytes = scmd->request->extra_len; 766 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 767 } 768 769 /** 770 * ata_dump_status - user friendly display of error info 771 * @id: id of the port in question 772 * @tf: ptr to filled out taskfile 773 * 774 * Decode and dump the ATA error/status registers for the user so 775 * that they have some idea what really happened at the non 776 * make-believe layer. 777 * 778 * LOCKING: 779 * inherited from caller 780 */ 781 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 782 { 783 u8 stat = tf->command, err = tf->feature; 784 785 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 786 if (stat & ATA_BUSY) { 787 printk("Busy }\n"); /* Data is not valid in this case */ 788 } else { 789 if (stat & 0x40) printk("DriveReady "); 790 if (stat & 0x20) printk("DeviceFault "); 791 if (stat & 0x10) printk("SeekComplete "); 792 if (stat & 0x08) printk("DataRequest "); 793 if (stat & 0x04) printk("CorrectedError "); 794 if (stat & 0x02) printk("Index "); 795 if (stat & 0x01) printk("Error "); 796 printk("}\n"); 797 798 if (err) { 799 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 800 if (err & 0x04) printk("DriveStatusError "); 801 if (err & 0x80) { 802 if (err & 0x04) printk("BadCRC "); 803 else printk("Sector "); 804 } 805 if (err & 0x40) printk("UncorrectableError "); 806 if (err & 0x10) printk("SectorIdNotFound "); 807 if (err & 0x02) printk("TrackZeroNotFound "); 808 if (err & 0x01) printk("AddrMarkNotFound "); 809 printk("}\n"); 810 } 811 } 812 } 813 814 /** 815 * ata_to_sense_error - convert ATA error to SCSI error 816 * @id: ATA device number 817 * @drv_stat: value contained in ATA status register 818 * @drv_err: value contained in ATA error register 819 * @sk: the sense key we'll fill out 820 * @asc: the additional sense code we'll fill out 821 * @ascq: the additional sense code qualifier we'll fill out 822 * @verbose: be verbose 823 * 824 * Converts an ATA error into a SCSI error. Fill out pointers to 825 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 826 * format sense blocks. 827 * 828 * LOCKING: 829 * spin_lock_irqsave(host lock) 830 */ 831 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 832 u8 *asc, u8 *ascq, int verbose) 833 { 834 int i; 835 836 /* Based on the 3ware driver translation table */ 837 static const unsigned char sense_table[][4] = { 838 /* BBD|ECC|ID|MAR */ 839 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 840 /* BBD|ECC|ID */ 841 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 842 /* ECC|MC|MARK */ 843 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 844 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 845 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 846 /* MC|ID|ABRT|TRK0|MARK */ 847 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 848 /* MCR|MARK */ 849 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 850 /* Bad address mark */ 851 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 852 /* TRK0 */ 853 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 854 /* Abort & !ICRC */ 855 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 856 /* Media change request */ 857 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 858 /* SRV */ 859 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 860 /* Media change */ 861 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 862 /* ECC */ 863 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 864 /* BBD - block marked bad */ 865 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 866 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 867 }; 868 static const unsigned char stat_table[][4] = { 869 /* Must be first because BUSY means no other bits valid */ 870 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 871 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 872 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 873 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 874 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 875 }; 876 877 /* 878 * Is this an error we can process/parse 879 */ 880 if (drv_stat & ATA_BUSY) { 881 drv_err = 0; /* Ignore the err bits, they're invalid */ 882 } 883 884 if (drv_err) { 885 /* Look for drv_err */ 886 for (i = 0; sense_table[i][0] != 0xFF; i++) { 887 /* Look for best matches first */ 888 if ((sense_table[i][0] & drv_err) == 889 sense_table[i][0]) { 890 *sk = sense_table[i][1]; 891 *asc = sense_table[i][2]; 892 *ascq = sense_table[i][3]; 893 goto translate_done; 894 } 895 } 896 /* No immediate match */ 897 if (verbose) 898 printk(KERN_WARNING "ata%u: no sense translation for " 899 "error 0x%02x\n", id, drv_err); 900 } 901 902 /* Fall back to interpreting status bits */ 903 for (i = 0; stat_table[i][0] != 0xFF; i++) { 904 if (stat_table[i][0] & drv_stat) { 905 *sk = stat_table[i][1]; 906 *asc = stat_table[i][2]; 907 *ascq = stat_table[i][3]; 908 goto translate_done; 909 } 910 } 911 /* No error? Undecoded? */ 912 if (verbose) 913 printk(KERN_WARNING "ata%u: no sense translation for " 914 "status: 0x%02x\n", id, drv_stat); 915 916 /* We need a sensible error return here, which is tricky, and one 917 that won't cause people to do things like return a disk wrongly */ 918 *sk = ABORTED_COMMAND; 919 *asc = 0x00; 920 *ascq = 0x00; 921 922 translate_done: 923 if (verbose) 924 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 925 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 926 id, drv_stat, drv_err, *sk, *asc, *ascq); 927 return; 928 } 929 930 /* 931 * ata_gen_passthru_sense - Generate check condition sense block. 932 * @qc: Command that completed. 933 * 934 * This function is specific to the ATA descriptor format sense 935 * block specified for the ATA pass through commands. Regardless 936 * of whether the command errored or not, return a sense 937 * block. Copy all controller registers into the sense 938 * block. Clear sense key, ASC & ASCQ if there is no error. 939 * 940 * LOCKING: 941 * None. 942 */ 943 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 944 { 945 struct scsi_cmnd *cmd = qc->scsicmd; 946 struct ata_taskfile *tf = &qc->result_tf; 947 unsigned char *sb = cmd->sense_buffer; 948 unsigned char *desc = sb + 8; 949 int verbose = qc->ap->ops->error_handler == NULL; 950 951 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 952 953 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 954 955 /* 956 * Use ata_to_sense_error() to map status register bits 957 * onto sense key, asc & ascq. 958 */ 959 if (qc->err_mask || 960 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 961 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 962 &sb[1], &sb[2], &sb[3], verbose); 963 sb[1] &= 0x0f; 964 } 965 966 /* 967 * Sense data is current and format is descriptor. 968 */ 969 sb[0] = 0x72; 970 971 desc[0] = 0x09; 972 973 /* set length of additional sense data */ 974 sb[7] = 14; 975 desc[1] = 12; 976 977 /* 978 * Copy registers into sense buffer. 979 */ 980 desc[2] = 0x00; 981 desc[3] = tf->feature; /* == error reg */ 982 desc[5] = tf->nsect; 983 desc[7] = tf->lbal; 984 desc[9] = tf->lbam; 985 desc[11] = tf->lbah; 986 desc[12] = tf->device; 987 desc[13] = tf->command; /* == status reg */ 988 989 /* 990 * Fill in Extend bit, and the high order bytes 991 * if applicable. 992 */ 993 if (tf->flags & ATA_TFLAG_LBA48) { 994 desc[2] |= 0x01; 995 desc[4] = tf->hob_nsect; 996 desc[6] = tf->hob_lbal; 997 desc[8] = tf->hob_lbam; 998 desc[10] = tf->hob_lbah; 999 } 1000 } 1001 1002 /** 1003 * ata_gen_ata_sense - generate a SCSI fixed sense block 1004 * @qc: Command that we are erroring out 1005 * 1006 * Generate sense block for a failed ATA command @qc. Descriptor 1007 * format is used to accomodate LBA48 block address. 1008 * 1009 * LOCKING: 1010 * None. 1011 */ 1012 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1013 { 1014 struct ata_device *dev = qc->dev; 1015 struct scsi_cmnd *cmd = qc->scsicmd; 1016 struct ata_taskfile *tf = &qc->result_tf; 1017 unsigned char *sb = cmd->sense_buffer; 1018 unsigned char *desc = sb + 8; 1019 int verbose = qc->ap->ops->error_handler == NULL; 1020 u64 block; 1021 1022 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1023 1024 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1025 1026 /* sense data is current and format is descriptor */ 1027 sb[0] = 0x72; 1028 1029 /* Use ata_to_sense_error() to map status register bits 1030 * onto sense key, asc & ascq. 1031 */ 1032 if (qc->err_mask || 1033 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1034 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1035 &sb[1], &sb[2], &sb[3], verbose); 1036 sb[1] &= 0x0f; 1037 } 1038 1039 block = ata_tf_read_block(&qc->result_tf, dev); 1040 1041 /* information sense data descriptor */ 1042 sb[7] = 12; 1043 desc[0] = 0x00; 1044 desc[1] = 10; 1045 1046 desc[2] |= 0x80; /* valid */ 1047 desc[6] = block >> 40; 1048 desc[7] = block >> 32; 1049 desc[8] = block >> 24; 1050 desc[9] = block >> 16; 1051 desc[10] = block >> 8; 1052 desc[11] = block; 1053 } 1054 1055 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1056 { 1057 sdev->use_10_for_rw = 1; 1058 sdev->use_10_for_ms = 1; 1059 1060 /* Schedule policy is determined by ->qc_defer() callback and 1061 * it needs to see every deferred qc. Set dev_blocked to 1 to 1062 * prevent SCSI midlayer from automatically deferring 1063 * requests. 1064 */ 1065 sdev->max_device_blocked = 1; 1066 } 1067 1068 /** 1069 * atapi_drain_needed - Check whether data transfer may overflow 1070 * @rq: request to be checked 1071 * 1072 * ATAPI commands which transfer variable length data to host 1073 * might overflow due to application error or hardare bug. This 1074 * function checks whether overflow should be drained and ignored 1075 * for @request. 1076 * 1077 * LOCKING: 1078 * None. 1079 * 1080 * RETURNS: 1081 * 1 if ; otherwise, 0. 1082 */ 1083 static int atapi_drain_needed(struct request *rq) 1084 { 1085 if (likely(!blk_pc_request(rq))) 1086 return 0; 1087 1088 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW)) 1089 return 0; 1090 1091 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1092 } 1093 1094 static int ata_scsi_dev_config(struct scsi_device *sdev, 1095 struct ata_device *dev) 1096 { 1097 if (!ata_id_has_unload(dev->id)) 1098 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1099 1100 /* configure max sectors */ 1101 blk_queue_max_hw_sectors(sdev->request_queue, dev->max_sectors); 1102 1103 if (dev->class == ATA_DEV_ATAPI) { 1104 struct request_queue *q = sdev->request_queue; 1105 void *buf; 1106 1107 /* set the min alignment and padding */ 1108 blk_queue_update_dma_alignment(sdev->request_queue, 1109 ATA_DMA_PAD_SZ - 1); 1110 blk_queue_update_dma_pad(sdev->request_queue, 1111 ATA_DMA_PAD_SZ - 1); 1112 1113 /* configure draining */ 1114 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1115 if (!buf) { 1116 ata_dev_printk(dev, KERN_ERR, 1117 "drain buffer allocation failed\n"); 1118 return -ENOMEM; 1119 } 1120 1121 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1122 } else { 1123 /* ATA devices must be sector aligned */ 1124 blk_queue_update_dma_alignment(sdev->request_queue, 1125 ATA_SECT_SIZE - 1); 1126 sdev->manage_start_stop = 1; 1127 } 1128 1129 if (dev->flags & ATA_DFLAG_AN) 1130 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1131 1132 if (dev->flags & ATA_DFLAG_NCQ) { 1133 int depth; 1134 1135 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1136 depth = min(ATA_MAX_QUEUE - 1, depth); 1137 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1138 } 1139 1140 return 0; 1141 } 1142 1143 /** 1144 * ata_scsi_slave_config - Set SCSI device attributes 1145 * @sdev: SCSI device to examine 1146 * 1147 * This is called before we actually start reading 1148 * and writing to the device, to configure certain 1149 * SCSI mid-layer behaviors. 1150 * 1151 * LOCKING: 1152 * Defined by SCSI layer. We don't really care. 1153 */ 1154 1155 int ata_scsi_slave_config(struct scsi_device *sdev) 1156 { 1157 struct ata_port *ap = ata_shost_to_port(sdev->host); 1158 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1159 int rc = 0; 1160 1161 ata_scsi_sdev_config(sdev); 1162 1163 if (dev) 1164 rc = ata_scsi_dev_config(sdev, dev); 1165 1166 return rc; 1167 } 1168 1169 /** 1170 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1171 * @sdev: SCSI device to be destroyed 1172 * 1173 * @sdev is about to be destroyed for hot/warm unplugging. If 1174 * this unplugging was initiated by libata as indicated by NULL 1175 * dev->sdev, this function doesn't have to do anything. 1176 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1177 * Clear dev->sdev, schedule the device for ATA detach and invoke 1178 * EH. 1179 * 1180 * LOCKING: 1181 * Defined by SCSI layer. We don't really care. 1182 */ 1183 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1184 { 1185 struct ata_port *ap = ata_shost_to_port(sdev->host); 1186 struct request_queue *q = sdev->request_queue; 1187 unsigned long flags; 1188 struct ata_device *dev; 1189 1190 if (!ap->ops->error_handler) 1191 return; 1192 1193 spin_lock_irqsave(ap->lock, flags); 1194 dev = __ata_scsi_find_dev(ap, sdev); 1195 if (dev && dev->sdev) { 1196 /* SCSI device already in CANCEL state, no need to offline it */ 1197 dev->sdev = NULL; 1198 dev->flags |= ATA_DFLAG_DETACH; 1199 ata_port_schedule_eh(ap); 1200 } 1201 spin_unlock_irqrestore(ap->lock, flags); 1202 1203 kfree(q->dma_drain_buffer); 1204 q->dma_drain_buffer = NULL; 1205 q->dma_drain_size = 0; 1206 } 1207 1208 /** 1209 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1210 * @sdev: SCSI device to configure queue depth for 1211 * @queue_depth: new queue depth 1212 * @reason: calling context 1213 * 1214 * This is libata standard hostt->change_queue_depth callback. 1215 * SCSI will call into this callback when user tries to set queue 1216 * depth via sysfs. 1217 * 1218 * LOCKING: 1219 * SCSI layer (we don't care) 1220 * 1221 * RETURNS: 1222 * Newly configured queue depth. 1223 */ 1224 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1225 int reason) 1226 { 1227 struct ata_port *ap = ata_shost_to_port(sdev->host); 1228 struct ata_device *dev; 1229 unsigned long flags; 1230 1231 if (reason != SCSI_QDEPTH_DEFAULT) 1232 return -EOPNOTSUPP; 1233 1234 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1235 return sdev->queue_depth; 1236 1237 dev = ata_scsi_find_dev(ap, sdev); 1238 if (!dev || !ata_dev_enabled(dev)) 1239 return sdev->queue_depth; 1240 1241 /* NCQ enabled? */ 1242 spin_lock_irqsave(ap->lock, flags); 1243 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1244 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1245 dev->flags |= ATA_DFLAG_NCQ_OFF; 1246 queue_depth = 1; 1247 } 1248 spin_unlock_irqrestore(ap->lock, flags); 1249 1250 /* limit and apply queue depth */ 1251 queue_depth = min(queue_depth, sdev->host->can_queue); 1252 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1253 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1254 1255 if (sdev->queue_depth == queue_depth) 1256 return -EINVAL; 1257 1258 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1259 return queue_depth; 1260 } 1261 1262 /** 1263 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1264 * @qc: Storage for translated ATA taskfile 1265 * 1266 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1267 * (to start). Perhaps these commands should be preceded by 1268 * CHECK POWER MODE to see what power mode the device is already in. 1269 * [See SAT revision 5 at www.t10.org] 1270 * 1271 * LOCKING: 1272 * spin_lock_irqsave(host lock) 1273 * 1274 * RETURNS: 1275 * Zero on success, non-zero on error. 1276 */ 1277 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1278 { 1279 struct scsi_cmnd *scmd = qc->scsicmd; 1280 struct ata_taskfile *tf = &qc->tf; 1281 const u8 *cdb = scmd->cmnd; 1282 1283 if (scmd->cmd_len < 5) 1284 goto invalid_fld; 1285 1286 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1287 tf->protocol = ATA_PROT_NODATA; 1288 if (cdb[1] & 0x1) { 1289 ; /* ignore IMMED bit, violates sat-r05 */ 1290 } 1291 if (cdb[4] & 0x2) 1292 goto invalid_fld; /* LOEJ bit set not supported */ 1293 if (((cdb[4] >> 4) & 0xf) != 0) 1294 goto invalid_fld; /* power conditions not supported */ 1295 1296 if (cdb[4] & 0x1) { 1297 tf->nsect = 1; /* 1 sector, lba=0 */ 1298 1299 if (qc->dev->flags & ATA_DFLAG_LBA) { 1300 tf->flags |= ATA_TFLAG_LBA; 1301 1302 tf->lbah = 0x0; 1303 tf->lbam = 0x0; 1304 tf->lbal = 0x0; 1305 tf->device |= ATA_LBA; 1306 } else { 1307 /* CHS */ 1308 tf->lbal = 0x1; /* sect */ 1309 tf->lbam = 0x0; /* cyl low */ 1310 tf->lbah = 0x0; /* cyl high */ 1311 } 1312 1313 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1314 } else { 1315 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1316 * or S5) causing some drives to spin up and down again. 1317 */ 1318 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1319 system_state == SYSTEM_POWER_OFF) 1320 goto skip; 1321 1322 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1323 system_entering_hibernation()) 1324 goto skip; 1325 1326 /* Issue ATA STANDBY IMMEDIATE command */ 1327 tf->command = ATA_CMD_STANDBYNOW1; 1328 } 1329 1330 /* 1331 * Standby and Idle condition timers could be implemented but that 1332 * would require libata to implement the Power condition mode page 1333 * and allow the user to change it. Changing mode pages requires 1334 * MODE SELECT to be implemented. 1335 */ 1336 1337 return 0; 1338 1339 invalid_fld: 1340 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1341 /* "Invalid field in cbd" */ 1342 return 1; 1343 skip: 1344 scmd->result = SAM_STAT_GOOD; 1345 return 1; 1346 } 1347 1348 1349 /** 1350 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1351 * @qc: Storage for translated ATA taskfile 1352 * 1353 * Sets up an ATA taskfile to issue FLUSH CACHE or 1354 * FLUSH CACHE EXT. 1355 * 1356 * LOCKING: 1357 * spin_lock_irqsave(host lock) 1358 * 1359 * RETURNS: 1360 * Zero on success, non-zero on error. 1361 */ 1362 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1363 { 1364 struct ata_taskfile *tf = &qc->tf; 1365 1366 tf->flags |= ATA_TFLAG_DEVICE; 1367 tf->protocol = ATA_PROT_NODATA; 1368 1369 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1370 tf->command = ATA_CMD_FLUSH_EXT; 1371 else 1372 tf->command = ATA_CMD_FLUSH; 1373 1374 /* flush is critical for IO integrity, consider it an IO command */ 1375 qc->flags |= ATA_QCFLAG_IO; 1376 1377 return 0; 1378 } 1379 1380 /** 1381 * scsi_6_lba_len - Get LBA and transfer length 1382 * @cdb: SCSI command to translate 1383 * 1384 * Calculate LBA and transfer length for 6-byte commands. 1385 * 1386 * RETURNS: 1387 * @plba: the LBA 1388 * @plen: the transfer length 1389 */ 1390 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1391 { 1392 u64 lba = 0; 1393 u32 len; 1394 1395 VPRINTK("six-byte command\n"); 1396 1397 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1398 lba |= ((u64)cdb[2]) << 8; 1399 lba |= ((u64)cdb[3]); 1400 1401 len = cdb[4]; 1402 1403 *plba = lba; 1404 *plen = len; 1405 } 1406 1407 /** 1408 * scsi_10_lba_len - Get LBA and transfer length 1409 * @cdb: SCSI command to translate 1410 * 1411 * Calculate LBA and transfer length for 10-byte commands. 1412 * 1413 * RETURNS: 1414 * @plba: the LBA 1415 * @plen: the transfer length 1416 */ 1417 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1418 { 1419 u64 lba = 0; 1420 u32 len = 0; 1421 1422 VPRINTK("ten-byte command\n"); 1423 1424 lba |= ((u64)cdb[2]) << 24; 1425 lba |= ((u64)cdb[3]) << 16; 1426 lba |= ((u64)cdb[4]) << 8; 1427 lba |= ((u64)cdb[5]); 1428 1429 len |= ((u32)cdb[7]) << 8; 1430 len |= ((u32)cdb[8]); 1431 1432 *plba = lba; 1433 *plen = len; 1434 } 1435 1436 /** 1437 * scsi_16_lba_len - Get LBA and transfer length 1438 * @cdb: SCSI command to translate 1439 * 1440 * Calculate LBA and transfer length for 16-byte commands. 1441 * 1442 * RETURNS: 1443 * @plba: the LBA 1444 * @plen: the transfer length 1445 */ 1446 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1447 { 1448 u64 lba = 0; 1449 u32 len = 0; 1450 1451 VPRINTK("sixteen-byte command\n"); 1452 1453 lba |= ((u64)cdb[2]) << 56; 1454 lba |= ((u64)cdb[3]) << 48; 1455 lba |= ((u64)cdb[4]) << 40; 1456 lba |= ((u64)cdb[5]) << 32; 1457 lba |= ((u64)cdb[6]) << 24; 1458 lba |= ((u64)cdb[7]) << 16; 1459 lba |= ((u64)cdb[8]) << 8; 1460 lba |= ((u64)cdb[9]); 1461 1462 len |= ((u32)cdb[10]) << 24; 1463 len |= ((u32)cdb[11]) << 16; 1464 len |= ((u32)cdb[12]) << 8; 1465 len |= ((u32)cdb[13]); 1466 1467 *plba = lba; 1468 *plen = len; 1469 } 1470 1471 /** 1472 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1473 * @qc: Storage for translated ATA taskfile 1474 * 1475 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1476 * 1477 * LOCKING: 1478 * spin_lock_irqsave(host lock) 1479 * 1480 * RETURNS: 1481 * Zero on success, non-zero on error. 1482 */ 1483 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1484 { 1485 struct scsi_cmnd *scmd = qc->scsicmd; 1486 struct ata_taskfile *tf = &qc->tf; 1487 struct ata_device *dev = qc->dev; 1488 u64 dev_sectors = qc->dev->n_sectors; 1489 const u8 *cdb = scmd->cmnd; 1490 u64 block; 1491 u32 n_block; 1492 1493 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1494 tf->protocol = ATA_PROT_NODATA; 1495 1496 if (cdb[0] == VERIFY) { 1497 if (scmd->cmd_len < 10) 1498 goto invalid_fld; 1499 scsi_10_lba_len(cdb, &block, &n_block); 1500 } else if (cdb[0] == VERIFY_16) { 1501 if (scmd->cmd_len < 16) 1502 goto invalid_fld; 1503 scsi_16_lba_len(cdb, &block, &n_block); 1504 } else 1505 goto invalid_fld; 1506 1507 if (!n_block) 1508 goto nothing_to_do; 1509 if (block >= dev_sectors) 1510 goto out_of_range; 1511 if ((block + n_block) > dev_sectors) 1512 goto out_of_range; 1513 1514 if (dev->flags & ATA_DFLAG_LBA) { 1515 tf->flags |= ATA_TFLAG_LBA; 1516 1517 if (lba_28_ok(block, n_block)) { 1518 /* use LBA28 */ 1519 tf->command = ATA_CMD_VERIFY; 1520 tf->device |= (block >> 24) & 0xf; 1521 } else if (lba_48_ok(block, n_block)) { 1522 if (!(dev->flags & ATA_DFLAG_LBA48)) 1523 goto out_of_range; 1524 1525 /* use LBA48 */ 1526 tf->flags |= ATA_TFLAG_LBA48; 1527 tf->command = ATA_CMD_VERIFY_EXT; 1528 1529 tf->hob_nsect = (n_block >> 8) & 0xff; 1530 1531 tf->hob_lbah = (block >> 40) & 0xff; 1532 tf->hob_lbam = (block >> 32) & 0xff; 1533 tf->hob_lbal = (block >> 24) & 0xff; 1534 } else 1535 /* request too large even for LBA48 */ 1536 goto out_of_range; 1537 1538 tf->nsect = n_block & 0xff; 1539 1540 tf->lbah = (block >> 16) & 0xff; 1541 tf->lbam = (block >> 8) & 0xff; 1542 tf->lbal = block & 0xff; 1543 1544 tf->device |= ATA_LBA; 1545 } else { 1546 /* CHS */ 1547 u32 sect, head, cyl, track; 1548 1549 if (!lba_28_ok(block, n_block)) 1550 goto out_of_range; 1551 1552 /* Convert LBA to CHS */ 1553 track = (u32)block / dev->sectors; 1554 cyl = track / dev->heads; 1555 head = track % dev->heads; 1556 sect = (u32)block % dev->sectors + 1; 1557 1558 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1559 (u32)block, track, cyl, head, sect); 1560 1561 /* Check whether the converted CHS can fit. 1562 Cylinder: 0-65535 1563 Head: 0-15 1564 Sector: 1-255*/ 1565 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1566 goto out_of_range; 1567 1568 tf->command = ATA_CMD_VERIFY; 1569 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1570 tf->lbal = sect; 1571 tf->lbam = cyl; 1572 tf->lbah = cyl >> 8; 1573 tf->device |= head; 1574 } 1575 1576 return 0; 1577 1578 invalid_fld: 1579 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1580 /* "Invalid field in cbd" */ 1581 return 1; 1582 1583 out_of_range: 1584 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1585 /* "Logical Block Address out of range" */ 1586 return 1; 1587 1588 nothing_to_do: 1589 scmd->result = SAM_STAT_GOOD; 1590 return 1; 1591 } 1592 1593 /** 1594 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1595 * @qc: Storage for translated ATA taskfile 1596 * 1597 * Converts any of six SCSI read/write commands into the 1598 * ATA counterpart, including starting sector (LBA), 1599 * sector count, and taking into account the device's LBA48 1600 * support. 1601 * 1602 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1603 * %WRITE_16 are currently supported. 1604 * 1605 * LOCKING: 1606 * spin_lock_irqsave(host lock) 1607 * 1608 * RETURNS: 1609 * Zero on success, non-zero on error. 1610 */ 1611 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1612 { 1613 struct scsi_cmnd *scmd = qc->scsicmd; 1614 const u8 *cdb = scmd->cmnd; 1615 unsigned int tf_flags = 0; 1616 u64 block; 1617 u32 n_block; 1618 int rc; 1619 1620 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1621 tf_flags |= ATA_TFLAG_WRITE; 1622 1623 /* Calculate the SCSI LBA, transfer length and FUA. */ 1624 switch (cdb[0]) { 1625 case READ_10: 1626 case WRITE_10: 1627 if (unlikely(scmd->cmd_len < 10)) 1628 goto invalid_fld; 1629 scsi_10_lba_len(cdb, &block, &n_block); 1630 if (unlikely(cdb[1] & (1 << 3))) 1631 tf_flags |= ATA_TFLAG_FUA; 1632 break; 1633 case READ_6: 1634 case WRITE_6: 1635 if (unlikely(scmd->cmd_len < 6)) 1636 goto invalid_fld; 1637 scsi_6_lba_len(cdb, &block, &n_block); 1638 1639 /* for 6-byte r/w commands, transfer length 0 1640 * means 256 blocks of data, not 0 block. 1641 */ 1642 if (!n_block) 1643 n_block = 256; 1644 break; 1645 case READ_16: 1646 case WRITE_16: 1647 if (unlikely(scmd->cmd_len < 16)) 1648 goto invalid_fld; 1649 scsi_16_lba_len(cdb, &block, &n_block); 1650 if (unlikely(cdb[1] & (1 << 3))) 1651 tf_flags |= ATA_TFLAG_FUA; 1652 break; 1653 default: 1654 DPRINTK("no-byte command\n"); 1655 goto invalid_fld; 1656 } 1657 1658 /* Check and compose ATA command */ 1659 if (!n_block) 1660 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1661 * length 0 means transfer 0 block of data. 1662 * However, for ATA R/W commands, sector count 0 means 1663 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1664 * 1665 * WARNING: one or two older ATA drives treat 0 as 0... 1666 */ 1667 goto nothing_to_do; 1668 1669 qc->flags |= ATA_QCFLAG_IO; 1670 qc->nbytes = n_block * ATA_SECT_SIZE; 1671 1672 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1673 qc->tag); 1674 if (likely(rc == 0)) 1675 return 0; 1676 1677 if (rc == -ERANGE) 1678 goto out_of_range; 1679 /* treat all other errors as -EINVAL, fall through */ 1680 invalid_fld: 1681 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1682 /* "Invalid field in cbd" */ 1683 return 1; 1684 1685 out_of_range: 1686 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1687 /* "Logical Block Address out of range" */ 1688 return 1; 1689 1690 nothing_to_do: 1691 scmd->result = SAM_STAT_GOOD; 1692 return 1; 1693 } 1694 1695 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1696 { 1697 struct ata_port *ap = qc->ap; 1698 struct scsi_cmnd *cmd = qc->scsicmd; 1699 u8 *cdb = cmd->cmnd; 1700 int need_sense = (qc->err_mask != 0); 1701 1702 /* For ATA pass thru (SAT) commands, generate a sense block if 1703 * user mandated it or if there's an error. Note that if we 1704 * generate because the user forced us to, a check condition 1705 * is generated and the ATA register values are returned 1706 * whether the command completed successfully or not. If there 1707 * was no error, SK, ASC and ASCQ will all be zero. 1708 */ 1709 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1710 ((cdb[2] & 0x20) || need_sense)) { 1711 ata_gen_passthru_sense(qc); 1712 } else { 1713 if (!need_sense) { 1714 cmd->result = SAM_STAT_GOOD; 1715 } else { 1716 /* TODO: decide which descriptor format to use 1717 * for 48b LBA devices and call that here 1718 * instead of the fixed desc, which is only 1719 * good for smaller LBA (and maybe CHS?) 1720 * devices. 1721 */ 1722 ata_gen_ata_sense(qc); 1723 } 1724 } 1725 1726 if (need_sense && !ap->ops->error_handler) 1727 ata_dump_status(ap->print_id, &qc->result_tf); 1728 1729 qc->scsidone(cmd); 1730 1731 ata_qc_free(qc); 1732 } 1733 1734 /** 1735 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1736 * @dev: ATA device to which the command is addressed 1737 * @cmd: SCSI command to execute 1738 * @done: SCSI command completion function 1739 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1740 * 1741 * Our ->queuecommand() function has decided that the SCSI 1742 * command issued can be directly translated into an ATA 1743 * command, rather than handled internally. 1744 * 1745 * This function sets up an ata_queued_cmd structure for the 1746 * SCSI command, and sends that ata_queued_cmd to the hardware. 1747 * 1748 * The xlat_func argument (actor) returns 0 if ready to execute 1749 * ATA command, else 1 to finish translation. If 1 is returned 1750 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1751 * to be set reflecting an error condition or clean (early) 1752 * termination. 1753 * 1754 * LOCKING: 1755 * spin_lock_irqsave(host lock) 1756 * 1757 * RETURNS: 1758 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1759 * needs to be deferred. 1760 */ 1761 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1762 void (*done)(struct scsi_cmnd *), 1763 ata_xlat_func_t xlat_func) 1764 { 1765 struct ata_port *ap = dev->link->ap; 1766 struct ata_queued_cmd *qc; 1767 int rc; 1768 1769 VPRINTK("ENTER\n"); 1770 1771 qc = ata_scsi_qc_new(dev, cmd, done); 1772 if (!qc) 1773 goto err_mem; 1774 1775 /* data is present; dma-map it */ 1776 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1777 cmd->sc_data_direction == DMA_TO_DEVICE) { 1778 if (unlikely(scsi_bufflen(cmd) < 1)) { 1779 ata_dev_printk(dev, KERN_WARNING, 1780 "WARNING: zero len r/w req\n"); 1781 goto err_did; 1782 } 1783 1784 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1785 1786 qc->dma_dir = cmd->sc_data_direction; 1787 } 1788 1789 qc->complete_fn = ata_scsi_qc_complete; 1790 1791 if (xlat_func(qc)) 1792 goto early_finish; 1793 1794 if (ap->ops->qc_defer) { 1795 if ((rc = ap->ops->qc_defer(qc))) 1796 goto defer; 1797 } 1798 1799 /* select device, send command to hardware */ 1800 ata_qc_issue(qc); 1801 1802 VPRINTK("EXIT\n"); 1803 return 0; 1804 1805 early_finish: 1806 ata_qc_free(qc); 1807 qc->scsidone(cmd); 1808 DPRINTK("EXIT - early finish (good or error)\n"); 1809 return 0; 1810 1811 err_did: 1812 ata_qc_free(qc); 1813 cmd->result = (DID_ERROR << 16); 1814 qc->scsidone(cmd); 1815 err_mem: 1816 DPRINTK("EXIT - internal\n"); 1817 return 0; 1818 1819 defer: 1820 ata_qc_free(qc); 1821 DPRINTK("EXIT - defer\n"); 1822 if (rc == ATA_DEFER_LINK) 1823 return SCSI_MLQUEUE_DEVICE_BUSY; 1824 else 1825 return SCSI_MLQUEUE_HOST_BUSY; 1826 } 1827 1828 /** 1829 * ata_scsi_rbuf_get - Map response buffer. 1830 * @cmd: SCSI command containing buffer to be mapped. 1831 * @flags: unsigned long variable to store irq enable status 1832 * @copy_in: copy in from user buffer 1833 * 1834 * Prepare buffer for simulated SCSI commands. 1835 * 1836 * LOCKING: 1837 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1838 * 1839 * RETURNS: 1840 * Pointer to response buffer. 1841 */ 1842 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1843 unsigned long *flags) 1844 { 1845 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1846 1847 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1848 if (copy_in) 1849 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1850 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1851 return ata_scsi_rbuf; 1852 } 1853 1854 /** 1855 * ata_scsi_rbuf_put - Unmap response buffer. 1856 * @cmd: SCSI command containing buffer to be unmapped. 1857 * @copy_out: copy out result 1858 * @flags: @flags passed to ata_scsi_rbuf_get() 1859 * 1860 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1861 * @copy_back is true. 1862 * 1863 * LOCKING: 1864 * Unlocks ata_scsi_rbuf_lock. 1865 */ 1866 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1867 unsigned long *flags) 1868 { 1869 if (copy_out) 1870 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1871 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1872 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1873 } 1874 1875 /** 1876 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1877 * @args: device IDENTIFY data / SCSI command of interest. 1878 * @actor: Callback hook for desired SCSI command simulator 1879 * 1880 * Takes care of the hard work of simulating a SCSI command... 1881 * Mapping the response buffer, calling the command's handler, 1882 * and handling the handler's return value. This return value 1883 * indicates whether the handler wishes the SCSI command to be 1884 * completed successfully (0), or not (in which case cmd->result 1885 * and sense buffer are assumed to be set). 1886 * 1887 * LOCKING: 1888 * spin_lock_irqsave(host lock) 1889 */ 1890 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1891 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1892 { 1893 u8 *rbuf; 1894 unsigned int rc; 1895 struct scsi_cmnd *cmd = args->cmd; 1896 unsigned long flags; 1897 1898 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1899 rc = actor(args, rbuf); 1900 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1901 1902 if (rc == 0) 1903 cmd->result = SAM_STAT_GOOD; 1904 args->done(cmd); 1905 } 1906 1907 /** 1908 * ata_scsiop_inq_std - Simulate INQUIRY command 1909 * @args: device IDENTIFY data / SCSI command of interest. 1910 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1911 * 1912 * Returns standard device identification data associated 1913 * with non-VPD INQUIRY command output. 1914 * 1915 * LOCKING: 1916 * spin_lock_irqsave(host lock) 1917 */ 1918 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1919 { 1920 const u8 versions[] = { 1921 0x60, /* SAM-3 (no version claimed) */ 1922 1923 0x03, 1924 0x20, /* SBC-2 (no version claimed) */ 1925 1926 0x02, 1927 0x60 /* SPC-3 (no version claimed) */ 1928 }; 1929 u8 hdr[] = { 1930 TYPE_DISK, 1931 0, 1932 0x5, /* claim SPC-3 version compatibility */ 1933 2, 1934 95 - 4 1935 }; 1936 1937 VPRINTK("ENTER\n"); 1938 1939 /* set scsi removeable (RMB) bit per ata bit */ 1940 if (ata_id_removeable(args->id)) 1941 hdr[1] |= (1 << 7); 1942 1943 memcpy(rbuf, hdr, sizeof(hdr)); 1944 memcpy(&rbuf[8], "ATA ", 8); 1945 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1946 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1947 1948 if (rbuf[32] == 0 || rbuf[32] == ' ') 1949 memcpy(&rbuf[32], "n/a ", 4); 1950 1951 memcpy(rbuf + 59, versions, sizeof(versions)); 1952 1953 return 0; 1954 } 1955 1956 /** 1957 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1958 * @args: device IDENTIFY data / SCSI command of interest. 1959 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1960 * 1961 * Returns list of inquiry VPD pages available. 1962 * 1963 * LOCKING: 1964 * spin_lock_irqsave(host lock) 1965 */ 1966 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1967 { 1968 const u8 pages[] = { 1969 0x00, /* page 0x00, this page */ 1970 0x80, /* page 0x80, unit serial no page */ 1971 0x83, /* page 0x83, device ident page */ 1972 0x89, /* page 0x89, ata info page */ 1973 0xb0, /* page 0xb0, block limits page */ 1974 0xb1, /* page 0xb1, block device characteristics page */ 1975 }; 1976 1977 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1978 memcpy(rbuf + 4, pages, sizeof(pages)); 1979 return 0; 1980 } 1981 1982 /** 1983 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1984 * @args: device IDENTIFY data / SCSI command of interest. 1985 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1986 * 1987 * Returns ATA device serial number. 1988 * 1989 * LOCKING: 1990 * spin_lock_irqsave(host lock) 1991 */ 1992 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 1993 { 1994 const u8 hdr[] = { 1995 0, 1996 0x80, /* this page code */ 1997 0, 1998 ATA_ID_SERNO_LEN, /* page len */ 1999 }; 2000 2001 memcpy(rbuf, hdr, sizeof(hdr)); 2002 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2003 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2004 return 0; 2005 } 2006 2007 /** 2008 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2009 * @args: device IDENTIFY data / SCSI command of interest. 2010 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2011 * 2012 * Yields two logical unit device identification designators: 2013 * - vendor specific ASCII containing the ATA serial number 2014 * - SAT defined "t10 vendor id based" containing ASCII vendor 2015 * name ("ATA "), model and serial numbers. 2016 * 2017 * LOCKING: 2018 * spin_lock_irqsave(host lock) 2019 */ 2020 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2021 { 2022 const int sat_model_serial_desc_len = 68; 2023 int num; 2024 2025 rbuf[1] = 0x83; /* this page code */ 2026 num = 4; 2027 2028 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2029 rbuf[num + 0] = 2; 2030 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2031 num += 4; 2032 ata_id_string(args->id, (unsigned char *) rbuf + num, 2033 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2034 num += ATA_ID_SERNO_LEN; 2035 2036 /* SAT defined lu model and serial numbers descriptor */ 2037 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2038 rbuf[num + 0] = 2; 2039 rbuf[num + 1] = 1; 2040 rbuf[num + 3] = sat_model_serial_desc_len; 2041 num += 4; 2042 memcpy(rbuf + num, "ATA ", 8); 2043 num += 8; 2044 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2045 ATA_ID_PROD_LEN); 2046 num += ATA_ID_PROD_LEN; 2047 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2048 ATA_ID_SERNO_LEN); 2049 num += ATA_ID_SERNO_LEN; 2050 2051 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2052 return 0; 2053 } 2054 2055 /** 2056 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2057 * @args: device IDENTIFY data / SCSI command of interest. 2058 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2059 * 2060 * Yields SAT-specified ATA VPD page. 2061 * 2062 * LOCKING: 2063 * spin_lock_irqsave(host lock) 2064 */ 2065 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2066 { 2067 struct ata_taskfile tf; 2068 2069 memset(&tf, 0, sizeof(tf)); 2070 2071 rbuf[1] = 0x89; /* our page code */ 2072 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2073 rbuf[3] = (0x238 & 0xff); 2074 2075 memcpy(&rbuf[8], "linux ", 8); 2076 memcpy(&rbuf[16], "libata ", 16); 2077 memcpy(&rbuf[32], DRV_VERSION, 4); 2078 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2079 2080 /* we don't store the ATA device signature, so we fake it */ 2081 2082 tf.command = ATA_DRDY; /* really, this is Status reg */ 2083 tf.lbal = 0x1; 2084 tf.nsect = 0x1; 2085 2086 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2087 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2088 2089 rbuf[56] = ATA_CMD_ID_ATA; 2090 2091 memcpy(&rbuf[60], &args->id[0], 512); 2092 return 0; 2093 } 2094 2095 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2096 { 2097 u32 min_io_sectors; 2098 2099 rbuf[1] = 0xb0; 2100 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2101 2102 /* 2103 * Optimal transfer length granularity. 2104 * 2105 * This is always one physical block, but for disks with a smaller 2106 * logical than physical sector size we need to figure out what the 2107 * latter is. 2108 */ 2109 if (ata_id_has_large_logical_sectors(args->id)) 2110 min_io_sectors = ata_id_logical_per_physical_sectors(args->id); 2111 else 2112 min_io_sectors = 1; 2113 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2114 2115 /* 2116 * Optimal unmap granularity. 2117 * 2118 * The ATA spec doesn't even know about a granularity or alignment 2119 * for the TRIM command. We can leave away most of the unmap related 2120 * VPD page entries, but we have specifify a granularity to signal 2121 * that we support some form of unmap - in thise case via WRITE SAME 2122 * with the unmap bit set. 2123 */ 2124 if (ata_id_has_trim(args->id)) { 2125 put_unaligned_be32(65535 * 512 / 8, &rbuf[20]); 2126 put_unaligned_be32(1, &rbuf[28]); 2127 } 2128 2129 return 0; 2130 } 2131 2132 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2133 { 2134 int form_factor = ata_id_form_factor(args->id); 2135 int media_rotation_rate = ata_id_rotation_rate(args->id); 2136 2137 rbuf[1] = 0xb1; 2138 rbuf[3] = 0x3c; 2139 rbuf[4] = media_rotation_rate >> 8; 2140 rbuf[5] = media_rotation_rate; 2141 rbuf[7] = form_factor; 2142 2143 return 0; 2144 } 2145 2146 /** 2147 * ata_scsiop_noop - Command handler that simply returns success. 2148 * @args: device IDENTIFY data / SCSI command of interest. 2149 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2150 * 2151 * No operation. Simply returns success to caller, to indicate 2152 * that the caller should successfully complete this SCSI command. 2153 * 2154 * LOCKING: 2155 * spin_lock_irqsave(host lock) 2156 */ 2157 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2158 { 2159 VPRINTK("ENTER\n"); 2160 return 0; 2161 } 2162 2163 /** 2164 * ata_msense_caching - Simulate MODE SENSE caching info page 2165 * @id: device IDENTIFY data 2166 * @buf: output buffer 2167 * 2168 * Generate a caching info page, which conditionally indicates 2169 * write caching to the SCSI layer, depending on device 2170 * capabilities. 2171 * 2172 * LOCKING: 2173 * None. 2174 */ 2175 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2176 { 2177 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2178 if (ata_id_wcache_enabled(id)) 2179 buf[2] |= (1 << 2); /* write cache enable */ 2180 if (!ata_id_rahead_enabled(id)) 2181 buf[12] |= (1 << 5); /* disable read ahead */ 2182 return sizeof(def_cache_mpage); 2183 } 2184 2185 /** 2186 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2187 * @buf: output buffer 2188 * 2189 * Generate a generic MODE SENSE control mode page. 2190 * 2191 * LOCKING: 2192 * None. 2193 */ 2194 static unsigned int ata_msense_ctl_mode(u8 *buf) 2195 { 2196 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2197 return sizeof(def_control_mpage); 2198 } 2199 2200 /** 2201 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2202 * @buf: output buffer 2203 * 2204 * Generate a generic MODE SENSE r/w error recovery page. 2205 * 2206 * LOCKING: 2207 * None. 2208 */ 2209 static unsigned int ata_msense_rw_recovery(u8 *buf) 2210 { 2211 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2212 return sizeof(def_rw_recovery_mpage); 2213 } 2214 2215 /* 2216 * We can turn this into a real blacklist if it's needed, for now just 2217 * blacklist any Maxtor BANC1G10 revision firmware 2218 */ 2219 static int ata_dev_supports_fua(u16 *id) 2220 { 2221 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2222 2223 if (!libata_fua) 2224 return 0; 2225 if (!ata_id_has_fua(id)) 2226 return 0; 2227 2228 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2229 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2230 2231 if (strcmp(model, "Maxtor")) 2232 return 1; 2233 if (strcmp(fw, "BANC1G10")) 2234 return 1; 2235 2236 return 0; /* blacklisted */ 2237 } 2238 2239 /** 2240 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2241 * @args: device IDENTIFY data / SCSI command of interest. 2242 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2243 * 2244 * Simulate MODE SENSE commands. Assume this is invoked for direct 2245 * access devices (e.g. disks) only. There should be no block 2246 * descriptor for other device types. 2247 * 2248 * LOCKING: 2249 * spin_lock_irqsave(host lock) 2250 */ 2251 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2252 { 2253 struct ata_device *dev = args->dev; 2254 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2255 const u8 sat_blk_desc[] = { 2256 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2257 0, 2258 0, 0x2, 0x0 /* block length: 512 bytes */ 2259 }; 2260 u8 pg, spg; 2261 unsigned int ebd, page_control, six_byte; 2262 u8 dpofua; 2263 2264 VPRINTK("ENTER\n"); 2265 2266 six_byte = (scsicmd[0] == MODE_SENSE); 2267 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2268 /* 2269 * LLBA bit in msense(10) ignored (compliant) 2270 */ 2271 2272 page_control = scsicmd[2] >> 6; 2273 switch (page_control) { 2274 case 0: /* current */ 2275 break; /* supported */ 2276 case 3: /* saved */ 2277 goto saving_not_supp; 2278 case 1: /* changeable */ 2279 case 2: /* defaults */ 2280 default: 2281 goto invalid_fld; 2282 } 2283 2284 if (six_byte) 2285 p += 4 + (ebd ? 8 : 0); 2286 else 2287 p += 8 + (ebd ? 8 : 0); 2288 2289 pg = scsicmd[2] & 0x3f; 2290 spg = scsicmd[3]; 2291 /* 2292 * No mode subpages supported (yet) but asking for _all_ 2293 * subpages may be valid 2294 */ 2295 if (spg && (spg != ALL_SUB_MPAGES)) 2296 goto invalid_fld; 2297 2298 switch(pg) { 2299 case RW_RECOVERY_MPAGE: 2300 p += ata_msense_rw_recovery(p); 2301 break; 2302 2303 case CACHE_MPAGE: 2304 p += ata_msense_caching(args->id, p); 2305 break; 2306 2307 case CONTROL_MPAGE: 2308 p += ata_msense_ctl_mode(p); 2309 break; 2310 2311 case ALL_MPAGES: 2312 p += ata_msense_rw_recovery(p); 2313 p += ata_msense_caching(args->id, p); 2314 p += ata_msense_ctl_mode(p); 2315 break; 2316 2317 default: /* invalid page code */ 2318 goto invalid_fld; 2319 } 2320 2321 dpofua = 0; 2322 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2323 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2324 dpofua = 1 << 4; 2325 2326 if (six_byte) { 2327 rbuf[0] = p - rbuf - 1; 2328 rbuf[2] |= dpofua; 2329 if (ebd) { 2330 rbuf[3] = sizeof(sat_blk_desc); 2331 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2332 } 2333 } else { 2334 unsigned int output_len = p - rbuf - 2; 2335 2336 rbuf[0] = output_len >> 8; 2337 rbuf[1] = output_len; 2338 rbuf[3] |= dpofua; 2339 if (ebd) { 2340 rbuf[7] = sizeof(sat_blk_desc); 2341 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2342 } 2343 } 2344 return 0; 2345 2346 invalid_fld: 2347 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2348 /* "Invalid field in cbd" */ 2349 return 1; 2350 2351 saving_not_supp: 2352 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2353 /* "Saving parameters not supported" */ 2354 return 1; 2355 } 2356 2357 /** 2358 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2359 * @args: device IDENTIFY data / SCSI command of interest. 2360 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2361 * 2362 * Simulate READ CAPACITY commands. 2363 * 2364 * LOCKING: 2365 * None. 2366 */ 2367 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2368 { 2369 struct ata_device *dev = args->dev; 2370 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2371 u8 log_per_phys = 0; 2372 u16 lowest_aligned = 0; 2373 u16 word_106 = dev->id[106]; 2374 u16 word_209 = dev->id[209]; 2375 2376 if ((word_106 & 0xc000) == 0x4000) { 2377 /* Number and offset of logical sectors per physical sector */ 2378 if (word_106 & (1 << 13)) 2379 log_per_phys = word_106 & 0xf; 2380 if ((word_209 & 0xc000) == 0x4000) { 2381 u16 first = dev->id[209] & 0x3fff; 2382 if (first > 0) 2383 lowest_aligned = (1 << log_per_phys) - first; 2384 } 2385 } 2386 2387 VPRINTK("ENTER\n"); 2388 2389 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2390 if (last_lba >= 0xffffffffULL) 2391 last_lba = 0xffffffff; 2392 2393 /* sector count, 32-bit */ 2394 rbuf[0] = last_lba >> (8 * 3); 2395 rbuf[1] = last_lba >> (8 * 2); 2396 rbuf[2] = last_lba >> (8 * 1); 2397 rbuf[3] = last_lba; 2398 2399 /* sector size */ 2400 rbuf[6] = ATA_SECT_SIZE >> 8; 2401 rbuf[7] = ATA_SECT_SIZE & 0xff; 2402 } else { 2403 /* sector count, 64-bit */ 2404 rbuf[0] = last_lba >> (8 * 7); 2405 rbuf[1] = last_lba >> (8 * 6); 2406 rbuf[2] = last_lba >> (8 * 5); 2407 rbuf[3] = last_lba >> (8 * 4); 2408 rbuf[4] = last_lba >> (8 * 3); 2409 rbuf[5] = last_lba >> (8 * 2); 2410 rbuf[6] = last_lba >> (8 * 1); 2411 rbuf[7] = last_lba; 2412 2413 /* sector size */ 2414 rbuf[10] = ATA_SECT_SIZE >> 8; 2415 rbuf[11] = ATA_SECT_SIZE & 0xff; 2416 2417 rbuf[12] = 0; 2418 rbuf[13] = log_per_phys; 2419 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2420 rbuf[15] = lowest_aligned; 2421 2422 if (ata_id_has_trim(args->id)) { 2423 rbuf[14] |= 0x80; /* TPE */ 2424 2425 if (ata_id_has_zero_after_trim(args->id)) 2426 rbuf[14] |= 0x40; /* TPRZ */ 2427 } 2428 } 2429 2430 return 0; 2431 } 2432 2433 /** 2434 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2435 * @args: device IDENTIFY data / SCSI command of interest. 2436 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2437 * 2438 * Simulate REPORT LUNS command. 2439 * 2440 * LOCKING: 2441 * spin_lock_irqsave(host lock) 2442 */ 2443 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2444 { 2445 VPRINTK("ENTER\n"); 2446 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2447 2448 return 0; 2449 } 2450 2451 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2452 { 2453 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2454 /* FIXME: not quite right; we don't want the 2455 * translation of taskfile registers into 2456 * a sense descriptors, since that's only 2457 * correct for ATA, not ATAPI 2458 */ 2459 ata_gen_passthru_sense(qc); 2460 } 2461 2462 qc->scsidone(qc->scsicmd); 2463 ata_qc_free(qc); 2464 } 2465 2466 /* is it pointless to prefer PIO for "safety reasons"? */ 2467 static inline int ata_pio_use_silly(struct ata_port *ap) 2468 { 2469 return (ap->flags & ATA_FLAG_PIO_DMA); 2470 } 2471 2472 static void atapi_request_sense(struct ata_queued_cmd *qc) 2473 { 2474 struct ata_port *ap = qc->ap; 2475 struct scsi_cmnd *cmd = qc->scsicmd; 2476 2477 DPRINTK("ATAPI request sense\n"); 2478 2479 /* FIXME: is this needed? */ 2480 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2481 2482 #ifdef CONFIG_ATA_SFF 2483 if (ap->ops->sff_tf_read) 2484 ap->ops->sff_tf_read(ap, &qc->tf); 2485 #endif 2486 2487 /* fill these in, for the case where they are -not- overwritten */ 2488 cmd->sense_buffer[0] = 0x70; 2489 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2490 2491 ata_qc_reinit(qc); 2492 2493 /* setup sg table and init transfer direction */ 2494 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2495 ata_sg_init(qc, &qc->sgent, 1); 2496 qc->dma_dir = DMA_FROM_DEVICE; 2497 2498 memset(&qc->cdb, 0, qc->dev->cdb_len); 2499 qc->cdb[0] = REQUEST_SENSE; 2500 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2501 2502 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2503 qc->tf.command = ATA_CMD_PACKET; 2504 2505 if (ata_pio_use_silly(ap)) { 2506 qc->tf.protocol = ATAPI_PROT_DMA; 2507 qc->tf.feature |= ATAPI_PKT_DMA; 2508 } else { 2509 qc->tf.protocol = ATAPI_PROT_PIO; 2510 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2511 qc->tf.lbah = 0; 2512 } 2513 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2514 2515 qc->complete_fn = atapi_sense_complete; 2516 2517 ata_qc_issue(qc); 2518 2519 DPRINTK("EXIT\n"); 2520 } 2521 2522 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2523 { 2524 struct scsi_cmnd *cmd = qc->scsicmd; 2525 unsigned int err_mask = qc->err_mask; 2526 2527 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2528 2529 /* handle completion from new EH */ 2530 if (unlikely(qc->ap->ops->error_handler && 2531 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2532 2533 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2534 /* FIXME: not quite right; we don't want the 2535 * translation of taskfile registers into a 2536 * sense descriptors, since that's only 2537 * correct for ATA, not ATAPI 2538 */ 2539 ata_gen_passthru_sense(qc); 2540 } 2541 2542 /* SCSI EH automatically locks door if sdev->locked is 2543 * set. Sometimes door lock request continues to 2544 * fail, for example, when no media is present. This 2545 * creates a loop - SCSI EH issues door lock which 2546 * fails and gets invoked again to acquire sense data 2547 * for the failed command. 2548 * 2549 * If door lock fails, always clear sdev->locked to 2550 * avoid this infinite loop. 2551 */ 2552 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2553 qc->dev->sdev->locked = 0; 2554 2555 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2556 qc->scsidone(cmd); 2557 ata_qc_free(qc); 2558 return; 2559 } 2560 2561 /* successful completion or old EH failure path */ 2562 if (unlikely(err_mask & AC_ERR_DEV)) { 2563 cmd->result = SAM_STAT_CHECK_CONDITION; 2564 atapi_request_sense(qc); 2565 return; 2566 } else if (unlikely(err_mask)) { 2567 /* FIXME: not quite right; we don't want the 2568 * translation of taskfile registers into 2569 * a sense descriptors, since that's only 2570 * correct for ATA, not ATAPI 2571 */ 2572 ata_gen_passthru_sense(qc); 2573 } else { 2574 u8 *scsicmd = cmd->cmnd; 2575 2576 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2577 unsigned long flags; 2578 u8 *buf; 2579 2580 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2581 2582 /* ATAPI devices typically report zero for their SCSI version, 2583 * and sometimes deviate from the spec WRT response data 2584 * format. If SCSI version is reported as zero like normal, 2585 * then we make the following fixups: 1) Fake MMC-5 version, 2586 * to indicate to the Linux scsi midlayer this is a modern 2587 * device. 2) Ensure response data format / ATAPI information 2588 * are always correct. 2589 */ 2590 if (buf[2] == 0) { 2591 buf[2] = 0x5; 2592 buf[3] = 0x32; 2593 } 2594 2595 ata_scsi_rbuf_put(cmd, true, &flags); 2596 } 2597 2598 cmd->result = SAM_STAT_GOOD; 2599 } 2600 2601 qc->scsidone(cmd); 2602 ata_qc_free(qc); 2603 } 2604 /** 2605 * atapi_xlat - Initialize PACKET taskfile 2606 * @qc: command structure to be initialized 2607 * 2608 * LOCKING: 2609 * spin_lock_irqsave(host lock) 2610 * 2611 * RETURNS: 2612 * Zero on success, non-zero on failure. 2613 */ 2614 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2615 { 2616 struct scsi_cmnd *scmd = qc->scsicmd; 2617 struct ata_device *dev = qc->dev; 2618 int nodata = (scmd->sc_data_direction == DMA_NONE); 2619 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2620 unsigned int nbytes; 2621 2622 memset(qc->cdb, 0, dev->cdb_len); 2623 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2624 2625 qc->complete_fn = atapi_qc_complete; 2626 2627 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2628 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2629 qc->tf.flags |= ATA_TFLAG_WRITE; 2630 DPRINTK("direction: write\n"); 2631 } 2632 2633 qc->tf.command = ATA_CMD_PACKET; 2634 ata_qc_set_pc_nbytes(qc); 2635 2636 /* check whether ATAPI DMA is safe */ 2637 if (!nodata && !using_pio && atapi_check_dma(qc)) 2638 using_pio = 1; 2639 2640 /* Some controller variants snoop this value for Packet 2641 * transfers to do state machine and FIFO management. Thus we 2642 * want to set it properly, and for DMA where it is 2643 * effectively meaningless. 2644 */ 2645 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2646 2647 /* Most ATAPI devices which honor transfer chunk size don't 2648 * behave according to the spec when odd chunk size which 2649 * matches the transfer length is specified. If the number of 2650 * bytes to transfer is 2n+1. According to the spec, what 2651 * should happen is to indicate that 2n+1 is going to be 2652 * transferred and transfer 2n+2 bytes where the last byte is 2653 * padding. 2654 * 2655 * In practice, this doesn't happen. ATAPI devices first 2656 * indicate and transfer 2n bytes and then indicate and 2657 * transfer 2 bytes where the last byte is padding. 2658 * 2659 * This inconsistency confuses several controllers which 2660 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2661 * These controllers use actual number of transferred bytes to 2662 * update DMA poitner and transfer of 4n+2 bytes make those 2663 * controller push DMA pointer by 4n+4 bytes because SATA data 2664 * FISes are aligned to 4 bytes. This causes data corruption 2665 * and buffer overrun. 2666 * 2667 * Always setting nbytes to even number solves this problem 2668 * because then ATAPI devices don't have to split data at 2n 2669 * boundaries. 2670 */ 2671 if (nbytes & 0x1) 2672 nbytes++; 2673 2674 qc->tf.lbam = (nbytes & 0xFF); 2675 qc->tf.lbah = (nbytes >> 8); 2676 2677 if (nodata) 2678 qc->tf.protocol = ATAPI_PROT_NODATA; 2679 else if (using_pio) 2680 qc->tf.protocol = ATAPI_PROT_PIO; 2681 else { 2682 /* DMA data xfer */ 2683 qc->tf.protocol = ATAPI_PROT_DMA; 2684 qc->tf.feature |= ATAPI_PKT_DMA; 2685 2686 if ((dev->flags & ATA_DFLAG_DMADIR) && 2687 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2688 /* some SATA bridges need us to indicate data xfer direction */ 2689 qc->tf.feature |= ATAPI_DMADIR; 2690 } 2691 2692 2693 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2694 as ATAPI tape drives don't get this right otherwise */ 2695 return 0; 2696 } 2697 2698 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2699 { 2700 if (!sata_pmp_attached(ap)) { 2701 if (likely(devno < ata_link_max_devices(&ap->link))) 2702 return &ap->link.device[devno]; 2703 } else { 2704 if (likely(devno < ap->nr_pmp_links)) 2705 return &ap->pmp_link[devno].device[0]; 2706 } 2707 2708 return NULL; 2709 } 2710 2711 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2712 const struct scsi_device *scsidev) 2713 { 2714 int devno; 2715 2716 /* skip commands not addressed to targets we simulate */ 2717 if (!sata_pmp_attached(ap)) { 2718 if (unlikely(scsidev->channel || scsidev->lun)) 2719 return NULL; 2720 devno = scsidev->id; 2721 } else { 2722 if (unlikely(scsidev->id || scsidev->lun)) 2723 return NULL; 2724 devno = scsidev->channel; 2725 } 2726 2727 return ata_find_dev(ap, devno); 2728 } 2729 2730 /** 2731 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2732 * @ap: ATA port to which the device is attached 2733 * @scsidev: SCSI device from which we derive the ATA device 2734 * 2735 * Given various information provided in struct scsi_cmnd, 2736 * map that onto an ATA bus, and using that mapping 2737 * determine which ata_device is associated with the 2738 * SCSI command to be sent. 2739 * 2740 * LOCKING: 2741 * spin_lock_irqsave(host lock) 2742 * 2743 * RETURNS: 2744 * Associated ATA device, or %NULL if not found. 2745 */ 2746 static struct ata_device * 2747 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2748 { 2749 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2750 2751 if (unlikely(!dev || !ata_dev_enabled(dev))) 2752 return NULL; 2753 2754 return dev; 2755 } 2756 2757 /* 2758 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2759 * @byte1: Byte 1 from pass-thru CDB. 2760 * 2761 * RETURNS: 2762 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2763 */ 2764 static u8 2765 ata_scsi_map_proto(u8 byte1) 2766 { 2767 switch((byte1 & 0x1e) >> 1) { 2768 case 3: /* Non-data */ 2769 return ATA_PROT_NODATA; 2770 2771 case 6: /* DMA */ 2772 case 10: /* UDMA Data-in */ 2773 case 11: /* UDMA Data-Out */ 2774 return ATA_PROT_DMA; 2775 2776 case 4: /* PIO Data-in */ 2777 case 5: /* PIO Data-out */ 2778 return ATA_PROT_PIO; 2779 2780 case 0: /* Hard Reset */ 2781 case 1: /* SRST */ 2782 case 8: /* Device Diagnostic */ 2783 case 9: /* Device Reset */ 2784 case 7: /* DMA Queued */ 2785 case 12: /* FPDMA */ 2786 case 15: /* Return Response Info */ 2787 default: /* Reserved */ 2788 break; 2789 } 2790 2791 return ATA_PROT_UNKNOWN; 2792 } 2793 2794 /** 2795 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2796 * @qc: command structure to be initialized 2797 * 2798 * Handles either 12 or 16-byte versions of the CDB. 2799 * 2800 * RETURNS: 2801 * Zero on success, non-zero on failure. 2802 */ 2803 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2804 { 2805 struct ata_taskfile *tf = &(qc->tf); 2806 struct scsi_cmnd *scmd = qc->scsicmd; 2807 struct ata_device *dev = qc->dev; 2808 const u8 *cdb = scmd->cmnd; 2809 2810 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2811 goto invalid_fld; 2812 2813 /* 2814 * 12 and 16 byte CDBs use different offsets to 2815 * provide the various register values. 2816 */ 2817 if (cdb[0] == ATA_16) { 2818 /* 2819 * 16-byte CDB - may contain extended commands. 2820 * 2821 * If that is the case, copy the upper byte register values. 2822 */ 2823 if (cdb[1] & 0x01) { 2824 tf->hob_feature = cdb[3]; 2825 tf->hob_nsect = cdb[5]; 2826 tf->hob_lbal = cdb[7]; 2827 tf->hob_lbam = cdb[9]; 2828 tf->hob_lbah = cdb[11]; 2829 tf->flags |= ATA_TFLAG_LBA48; 2830 } else 2831 tf->flags &= ~ATA_TFLAG_LBA48; 2832 2833 /* 2834 * Always copy low byte, device and command registers. 2835 */ 2836 tf->feature = cdb[4]; 2837 tf->nsect = cdb[6]; 2838 tf->lbal = cdb[8]; 2839 tf->lbam = cdb[10]; 2840 tf->lbah = cdb[12]; 2841 tf->device = cdb[13]; 2842 tf->command = cdb[14]; 2843 } else { 2844 /* 2845 * 12-byte CDB - incapable of extended commands. 2846 */ 2847 tf->flags &= ~ATA_TFLAG_LBA48; 2848 2849 tf->feature = cdb[3]; 2850 tf->nsect = cdb[4]; 2851 tf->lbal = cdb[5]; 2852 tf->lbam = cdb[6]; 2853 tf->lbah = cdb[7]; 2854 tf->device = cdb[8]; 2855 tf->command = cdb[9]; 2856 } 2857 2858 /* enforce correct master/slave bit */ 2859 tf->device = dev->devno ? 2860 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2861 2862 /* READ/WRITE LONG use a non-standard sect_size */ 2863 qc->sect_size = ATA_SECT_SIZE; 2864 switch (tf->command) { 2865 case ATA_CMD_READ_LONG: 2866 case ATA_CMD_READ_LONG_ONCE: 2867 case ATA_CMD_WRITE_LONG: 2868 case ATA_CMD_WRITE_LONG_ONCE: 2869 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2870 goto invalid_fld; 2871 qc->sect_size = scsi_bufflen(scmd); 2872 } 2873 2874 /* 2875 * Set flags so that all registers will be written, pass on 2876 * write indication (used for PIO/DMA setup), result TF is 2877 * copied back and we don't whine too much about its failure. 2878 */ 2879 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2880 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2881 tf->flags |= ATA_TFLAG_WRITE; 2882 2883 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2884 2885 /* 2886 * Set transfer length. 2887 * 2888 * TODO: find out if we need to do more here to 2889 * cover scatter/gather case. 2890 */ 2891 ata_qc_set_pc_nbytes(qc); 2892 2893 /* We may not issue DMA commands if no DMA mode is set */ 2894 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2895 goto invalid_fld; 2896 2897 /* sanity check for pio multi commands */ 2898 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2899 goto invalid_fld; 2900 2901 if (is_multi_taskfile(tf)) { 2902 unsigned int multi_count = 1 << (cdb[1] >> 5); 2903 2904 /* compare the passed through multi_count 2905 * with the cached multi_count of libata 2906 */ 2907 if (multi_count != dev->multi_count) 2908 ata_dev_printk(dev, KERN_WARNING, 2909 "invalid multi_count %u ignored\n", 2910 multi_count); 2911 } 2912 2913 /* 2914 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2915 * SET_FEATURES - XFER MODE must be preceded/succeeded 2916 * by an update to hardware-specific registers for each 2917 * controller (i.e. the reason for ->set_piomode(), 2918 * ->set_dmamode(), and ->post_set_mode() hooks). 2919 */ 2920 if (tf->command == ATA_CMD_SET_FEATURES && 2921 tf->feature == SETFEATURES_XFER) 2922 goto invalid_fld; 2923 2924 /* 2925 * Filter TPM commands by default. These provide an 2926 * essentially uncontrolled encrypted "back door" between 2927 * applications and the disk. Set libata.allow_tpm=1 if you 2928 * have a real reason for wanting to use them. This ensures 2929 * that installed software cannot easily mess stuff up without 2930 * user intent. DVR type users will probably ship with this enabled 2931 * for movie content management. 2932 * 2933 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2934 * for this and should do in future but that it is not sufficient as 2935 * DCS is an optional feature set. Thus we also do the software filter 2936 * so that we comply with the TC consortium stated goal that the user 2937 * can turn off TC features of their system. 2938 */ 2939 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 2940 goto invalid_fld; 2941 2942 return 0; 2943 2944 invalid_fld: 2945 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2946 /* "Invalid field in cdb" */ 2947 return 1; 2948 } 2949 2950 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 2951 { 2952 struct ata_taskfile *tf = &qc->tf; 2953 struct scsi_cmnd *scmd = qc->scsicmd; 2954 struct ata_device *dev = qc->dev; 2955 const u8 *cdb = scmd->cmnd; 2956 u64 block; 2957 u32 n_block; 2958 u32 size; 2959 void *buf; 2960 2961 /* we may not issue DMA commands if no DMA mode is set */ 2962 if (unlikely(!dev->dma_mode)) 2963 goto invalid_fld; 2964 2965 if (unlikely(scmd->cmd_len < 16)) 2966 goto invalid_fld; 2967 scsi_16_lba_len(cdb, &block, &n_block); 2968 2969 /* for now we only support WRITE SAME with the unmap bit set */ 2970 if (unlikely(!(cdb[1] & 0x8))) 2971 goto invalid_fld; 2972 2973 /* 2974 * WRITE SAME always has a sector sized buffer as payload, this 2975 * should never be a multiple entry S/G list. 2976 */ 2977 if (!scsi_sg_count(scmd)) 2978 goto invalid_fld; 2979 2980 buf = page_address(sg_page(scsi_sglist(scmd))); 2981 size = ata_set_lba_range_entries(buf, 512, block, n_block); 2982 2983 tf->protocol = ATA_PROT_DMA; 2984 tf->hob_feature = 0; 2985 tf->feature = ATA_DSM_TRIM; 2986 tf->hob_nsect = (size / 512) >> 8; 2987 tf->nsect = size / 512; 2988 tf->command = ATA_CMD_DSM; 2989 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 2990 ATA_TFLAG_WRITE; 2991 2992 ata_qc_set_pc_nbytes(qc); 2993 2994 return 0; 2995 2996 invalid_fld: 2997 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2998 /* "Invalid field in cdb" */ 2999 return 1; 3000 } 3001 3002 /** 3003 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3004 * @dev: ATA device 3005 * @cmd: SCSI command opcode to consider 3006 * 3007 * Look up the SCSI command given, and determine whether the 3008 * SCSI command is to be translated or simulated. 3009 * 3010 * RETURNS: 3011 * Pointer to translation function if possible, %NULL if not. 3012 */ 3013 3014 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3015 { 3016 switch (cmd) { 3017 case READ_6: 3018 case READ_10: 3019 case READ_16: 3020 3021 case WRITE_6: 3022 case WRITE_10: 3023 case WRITE_16: 3024 return ata_scsi_rw_xlat; 3025 3026 case WRITE_SAME_16: 3027 return ata_scsi_write_same_xlat; 3028 3029 case SYNCHRONIZE_CACHE: 3030 if (ata_try_flush_cache(dev)) 3031 return ata_scsi_flush_xlat; 3032 break; 3033 3034 case VERIFY: 3035 case VERIFY_16: 3036 return ata_scsi_verify_xlat; 3037 3038 case ATA_12: 3039 case ATA_16: 3040 return ata_scsi_pass_thru; 3041 3042 case START_STOP: 3043 return ata_scsi_start_stop_xlat; 3044 } 3045 3046 return NULL; 3047 } 3048 3049 /** 3050 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3051 * @ap: ATA port to which the command was being sent 3052 * @cmd: SCSI command to dump 3053 * 3054 * Prints the contents of a SCSI command via printk(). 3055 */ 3056 3057 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3058 struct scsi_cmnd *cmd) 3059 { 3060 #ifdef ATA_DEBUG 3061 struct scsi_device *scsidev = cmd->device; 3062 u8 *scsicmd = cmd->cmnd; 3063 3064 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3065 ap->print_id, 3066 scsidev->channel, scsidev->id, scsidev->lun, 3067 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3068 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3069 scsicmd[8]); 3070 #endif 3071 } 3072 3073 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3074 void (*done)(struct scsi_cmnd *), 3075 struct ata_device *dev) 3076 { 3077 u8 scsi_op = scmd->cmnd[0]; 3078 ata_xlat_func_t xlat_func; 3079 int rc = 0; 3080 3081 if (dev->class == ATA_DEV_ATA) { 3082 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3083 goto bad_cdb_len; 3084 3085 xlat_func = ata_get_xlat_func(dev, scsi_op); 3086 } else { 3087 if (unlikely(!scmd->cmd_len)) 3088 goto bad_cdb_len; 3089 3090 xlat_func = NULL; 3091 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3092 /* relay SCSI command to ATAPI device */ 3093 int len = COMMAND_SIZE(scsi_op); 3094 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3095 goto bad_cdb_len; 3096 3097 xlat_func = atapi_xlat; 3098 } else { 3099 /* ATA_16 passthru, treat as an ATA command */ 3100 if (unlikely(scmd->cmd_len > 16)) 3101 goto bad_cdb_len; 3102 3103 xlat_func = ata_get_xlat_func(dev, scsi_op); 3104 } 3105 } 3106 3107 if (xlat_func) 3108 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 3109 else 3110 ata_scsi_simulate(dev, scmd, done); 3111 3112 return rc; 3113 3114 bad_cdb_len: 3115 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3116 scmd->cmd_len, scsi_op, dev->cdb_len); 3117 scmd->result = DID_ERROR << 16; 3118 done(scmd); 3119 return 0; 3120 } 3121 3122 /** 3123 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3124 * @cmd: SCSI command to be sent 3125 * @done: Completion function, called when command is complete 3126 * 3127 * In some cases, this function translates SCSI commands into 3128 * ATA taskfiles, and queues the taskfiles to be sent to 3129 * hardware. In other cases, this function simulates a 3130 * SCSI device by evaluating and responding to certain 3131 * SCSI commands. This creates the overall effect of 3132 * ATA and ATAPI devices appearing as SCSI devices. 3133 * 3134 * LOCKING: 3135 * Releases scsi-layer-held lock, and obtains host lock. 3136 * 3137 * RETURNS: 3138 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3139 * 0 otherwise. 3140 */ 3141 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 3142 { 3143 struct ata_port *ap; 3144 struct ata_device *dev; 3145 struct scsi_device *scsidev = cmd->device; 3146 struct Scsi_Host *shost = scsidev->host; 3147 int rc = 0; 3148 3149 ap = ata_shost_to_port(shost); 3150 3151 spin_unlock(shost->host_lock); 3152 spin_lock(ap->lock); 3153 3154 ata_scsi_dump_cdb(ap, cmd); 3155 3156 dev = ata_scsi_find_dev(ap, scsidev); 3157 if (likely(dev)) 3158 rc = __ata_scsi_queuecmd(cmd, done, dev); 3159 else { 3160 cmd->result = (DID_BAD_TARGET << 16); 3161 done(cmd); 3162 } 3163 3164 spin_unlock(ap->lock); 3165 spin_lock(shost->host_lock); 3166 return rc; 3167 } 3168 3169 /** 3170 * ata_scsi_simulate - simulate SCSI command on ATA device 3171 * @dev: the target device 3172 * @cmd: SCSI command being sent to device. 3173 * @done: SCSI command completion function. 3174 * 3175 * Interprets and directly executes a select list of SCSI commands 3176 * that can be handled internally. 3177 * 3178 * LOCKING: 3179 * spin_lock_irqsave(host lock) 3180 */ 3181 3182 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 3183 void (*done)(struct scsi_cmnd *)) 3184 { 3185 struct ata_scsi_args args; 3186 const u8 *scsicmd = cmd->cmnd; 3187 u8 tmp8; 3188 3189 args.dev = dev; 3190 args.id = dev->id; 3191 args.cmd = cmd; 3192 args.done = done; 3193 3194 switch(scsicmd[0]) { 3195 /* TODO: worth improving? */ 3196 case FORMAT_UNIT: 3197 ata_scsi_invalid_field(cmd, done); 3198 break; 3199 3200 case INQUIRY: 3201 if (scsicmd[1] & 2) /* is CmdDt set? */ 3202 ata_scsi_invalid_field(cmd, done); 3203 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3204 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3205 else switch (scsicmd[2]) { 3206 case 0x00: 3207 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3208 break; 3209 case 0x80: 3210 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3211 break; 3212 case 0x83: 3213 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3214 break; 3215 case 0x89: 3216 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3217 break; 3218 case 0xb0: 3219 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3220 break; 3221 case 0xb1: 3222 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3223 break; 3224 default: 3225 ata_scsi_invalid_field(cmd, done); 3226 break; 3227 } 3228 break; 3229 3230 case MODE_SENSE: 3231 case MODE_SENSE_10: 3232 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3233 break; 3234 3235 case MODE_SELECT: /* unconditionally return */ 3236 case MODE_SELECT_10: /* bad-field-in-cdb */ 3237 ata_scsi_invalid_field(cmd, done); 3238 break; 3239 3240 case READ_CAPACITY: 3241 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3242 break; 3243 3244 case SERVICE_ACTION_IN: 3245 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3246 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3247 else 3248 ata_scsi_invalid_field(cmd, done); 3249 break; 3250 3251 case REPORT_LUNS: 3252 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3253 break; 3254 3255 case REQUEST_SENSE: 3256 ata_scsi_set_sense(cmd, 0, 0, 0); 3257 cmd->result = (DRIVER_SENSE << 24); 3258 done(cmd); 3259 break; 3260 3261 /* if we reach this, then writeback caching is disabled, 3262 * turning this into a no-op. 3263 */ 3264 case SYNCHRONIZE_CACHE: 3265 /* fall through */ 3266 3267 /* no-op's, complete with success */ 3268 case REZERO_UNIT: 3269 case SEEK_6: 3270 case SEEK_10: 3271 case TEST_UNIT_READY: 3272 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3273 break; 3274 3275 case SEND_DIAGNOSTIC: 3276 tmp8 = scsicmd[1] & ~(1 << 3); 3277 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3278 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3279 else 3280 ata_scsi_invalid_field(cmd, done); 3281 break; 3282 3283 /* all other commands */ 3284 default: 3285 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3286 /* "Invalid command operation code" */ 3287 done(cmd); 3288 break; 3289 } 3290 } 3291 3292 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3293 { 3294 int i, rc; 3295 3296 for (i = 0; i < host->n_ports; i++) { 3297 struct ata_port *ap = host->ports[i]; 3298 struct Scsi_Host *shost; 3299 3300 rc = -ENOMEM; 3301 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3302 if (!shost) 3303 goto err_alloc; 3304 3305 *(struct ata_port **)&shost->hostdata[0] = ap; 3306 ap->scsi_host = shost; 3307 3308 shost->transportt = &ata_scsi_transport_template; 3309 shost->unique_id = ap->print_id; 3310 shost->max_id = 16; 3311 shost->max_lun = 1; 3312 shost->max_channel = 1; 3313 shost->max_cmd_len = 16; 3314 3315 /* Schedule policy is determined by ->qc_defer() 3316 * callback and it needs to see every deferred qc. 3317 * Set host_blocked to 1 to prevent SCSI midlayer from 3318 * automatically deferring requests. 3319 */ 3320 shost->max_host_blocked = 1; 3321 3322 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3323 if (rc) 3324 goto err_add; 3325 } 3326 3327 return 0; 3328 3329 err_add: 3330 scsi_host_put(host->ports[i]->scsi_host); 3331 err_alloc: 3332 while (--i >= 0) { 3333 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3334 3335 scsi_remove_host(shost); 3336 scsi_host_put(shost); 3337 } 3338 return rc; 3339 } 3340 3341 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3342 { 3343 int tries = 5; 3344 struct ata_device *last_failed_dev = NULL; 3345 struct ata_link *link; 3346 struct ata_device *dev; 3347 3348 repeat: 3349 ata_for_each_link(link, ap, EDGE) { 3350 ata_for_each_dev(dev, link, ENABLED) { 3351 struct scsi_device *sdev; 3352 int channel = 0, id = 0; 3353 3354 if (dev->sdev) 3355 continue; 3356 3357 if (ata_is_host_link(link)) 3358 id = dev->devno; 3359 else 3360 channel = link->pmp; 3361 3362 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3363 NULL); 3364 if (!IS_ERR(sdev)) { 3365 dev->sdev = sdev; 3366 scsi_device_put(sdev); 3367 } 3368 } 3369 } 3370 3371 /* If we scanned while EH was in progress or allocation 3372 * failure occurred, scan would have failed silently. Check 3373 * whether all devices are attached. 3374 */ 3375 ata_for_each_link(link, ap, EDGE) { 3376 ata_for_each_dev(dev, link, ENABLED) { 3377 if (!dev->sdev) 3378 goto exit_loop; 3379 } 3380 } 3381 exit_loop: 3382 if (!link) 3383 return; 3384 3385 /* we're missing some SCSI devices */ 3386 if (sync) { 3387 /* If caller requested synchrnous scan && we've made 3388 * any progress, sleep briefly and repeat. 3389 */ 3390 if (dev != last_failed_dev) { 3391 msleep(100); 3392 last_failed_dev = dev; 3393 goto repeat; 3394 } 3395 3396 /* We might be failing to detect boot device, give it 3397 * a few more chances. 3398 */ 3399 if (--tries) { 3400 msleep(100); 3401 goto repeat; 3402 } 3403 3404 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan " 3405 "failed without making any progress,\n" 3406 " switching to async\n"); 3407 } 3408 3409 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3410 round_jiffies_relative(HZ)); 3411 } 3412 3413 /** 3414 * ata_scsi_offline_dev - offline attached SCSI device 3415 * @dev: ATA device to offline attached SCSI device for 3416 * 3417 * This function is called from ata_eh_hotplug() and responsible 3418 * for taking the SCSI device attached to @dev offline. This 3419 * function is called with host lock which protects dev->sdev 3420 * against clearing. 3421 * 3422 * LOCKING: 3423 * spin_lock_irqsave(host lock) 3424 * 3425 * RETURNS: 3426 * 1 if attached SCSI device exists, 0 otherwise. 3427 */ 3428 int ata_scsi_offline_dev(struct ata_device *dev) 3429 { 3430 if (dev->sdev) { 3431 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3432 return 1; 3433 } 3434 return 0; 3435 } 3436 3437 /** 3438 * ata_scsi_remove_dev - remove attached SCSI device 3439 * @dev: ATA device to remove attached SCSI device for 3440 * 3441 * This function is called from ata_eh_scsi_hotplug() and 3442 * responsible for removing the SCSI device attached to @dev. 3443 * 3444 * LOCKING: 3445 * Kernel thread context (may sleep). 3446 */ 3447 static void ata_scsi_remove_dev(struct ata_device *dev) 3448 { 3449 struct ata_port *ap = dev->link->ap; 3450 struct scsi_device *sdev; 3451 unsigned long flags; 3452 3453 /* Alas, we need to grab scan_mutex to ensure SCSI device 3454 * state doesn't change underneath us and thus 3455 * scsi_device_get() always succeeds. The mutex locking can 3456 * be removed if there is __scsi_device_get() interface which 3457 * increments reference counts regardless of device state. 3458 */ 3459 mutex_lock(&ap->scsi_host->scan_mutex); 3460 spin_lock_irqsave(ap->lock, flags); 3461 3462 /* clearing dev->sdev is protected by host lock */ 3463 sdev = dev->sdev; 3464 dev->sdev = NULL; 3465 3466 if (sdev) { 3467 /* If user initiated unplug races with us, sdev can go 3468 * away underneath us after the host lock and 3469 * scan_mutex are released. Hold onto it. 3470 */ 3471 if (scsi_device_get(sdev) == 0) { 3472 /* The following ensures the attached sdev is 3473 * offline on return from ata_scsi_offline_dev() 3474 * regardless it wins or loses the race 3475 * against this function. 3476 */ 3477 scsi_device_set_state(sdev, SDEV_OFFLINE); 3478 } else { 3479 WARN_ON(1); 3480 sdev = NULL; 3481 } 3482 } 3483 3484 spin_unlock_irqrestore(ap->lock, flags); 3485 mutex_unlock(&ap->scsi_host->scan_mutex); 3486 3487 if (sdev) { 3488 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3489 dev_name(&sdev->sdev_gendev)); 3490 3491 scsi_remove_device(sdev); 3492 scsi_device_put(sdev); 3493 } 3494 } 3495 3496 static void ata_scsi_handle_link_detach(struct ata_link *link) 3497 { 3498 struct ata_port *ap = link->ap; 3499 struct ata_device *dev; 3500 3501 ata_for_each_dev(dev, link, ALL) { 3502 unsigned long flags; 3503 3504 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3505 continue; 3506 3507 spin_lock_irqsave(ap->lock, flags); 3508 dev->flags &= ~ATA_DFLAG_DETACHED; 3509 spin_unlock_irqrestore(ap->lock, flags); 3510 3511 ata_scsi_remove_dev(dev); 3512 } 3513 } 3514 3515 /** 3516 * ata_scsi_media_change_notify - send media change event 3517 * @dev: Pointer to the disk device with media change event 3518 * 3519 * Tell the block layer to send a media change notification 3520 * event. 3521 * 3522 * LOCKING: 3523 * spin_lock_irqsave(host lock) 3524 */ 3525 void ata_scsi_media_change_notify(struct ata_device *dev) 3526 { 3527 if (dev->sdev) 3528 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3529 GFP_ATOMIC); 3530 } 3531 3532 /** 3533 * ata_scsi_hotplug - SCSI part of hotplug 3534 * @work: Pointer to ATA port to perform SCSI hotplug on 3535 * 3536 * Perform SCSI part of hotplug. It's executed from a separate 3537 * workqueue after EH completes. This is necessary because SCSI 3538 * hot plugging requires working EH and hot unplugging is 3539 * synchronized with hot plugging with a mutex. 3540 * 3541 * LOCKING: 3542 * Kernel thread context (may sleep). 3543 */ 3544 void ata_scsi_hotplug(struct work_struct *work) 3545 { 3546 struct ata_port *ap = 3547 container_of(work, struct ata_port, hotplug_task.work); 3548 int i; 3549 3550 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3551 DPRINTK("ENTER/EXIT - unloading\n"); 3552 return; 3553 } 3554 3555 DPRINTK("ENTER\n"); 3556 3557 /* Unplug detached devices. We cannot use link iterator here 3558 * because PMP links have to be scanned even if PMP is 3559 * currently not attached. Iterate manually. 3560 */ 3561 ata_scsi_handle_link_detach(&ap->link); 3562 if (ap->pmp_link) 3563 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3564 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3565 3566 /* scan for new ones */ 3567 ata_scsi_scan_host(ap, 0); 3568 3569 DPRINTK("EXIT\n"); 3570 } 3571 3572 /** 3573 * ata_scsi_user_scan - indication for user-initiated bus scan 3574 * @shost: SCSI host to scan 3575 * @channel: Channel to scan 3576 * @id: ID to scan 3577 * @lun: LUN to scan 3578 * 3579 * This function is called when user explicitly requests bus 3580 * scan. Set probe pending flag and invoke EH. 3581 * 3582 * LOCKING: 3583 * SCSI layer (we don't care) 3584 * 3585 * RETURNS: 3586 * Zero. 3587 */ 3588 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3589 unsigned int id, unsigned int lun) 3590 { 3591 struct ata_port *ap = ata_shost_to_port(shost); 3592 unsigned long flags; 3593 int devno, rc = 0; 3594 3595 if (!ap->ops->error_handler) 3596 return -EOPNOTSUPP; 3597 3598 if (lun != SCAN_WILD_CARD && lun) 3599 return -EINVAL; 3600 3601 if (!sata_pmp_attached(ap)) { 3602 if (channel != SCAN_WILD_CARD && channel) 3603 return -EINVAL; 3604 devno = id; 3605 } else { 3606 if (id != SCAN_WILD_CARD && id) 3607 return -EINVAL; 3608 devno = channel; 3609 } 3610 3611 spin_lock_irqsave(ap->lock, flags); 3612 3613 if (devno == SCAN_WILD_CARD) { 3614 struct ata_link *link; 3615 3616 ata_for_each_link(link, ap, EDGE) { 3617 struct ata_eh_info *ehi = &link->eh_info; 3618 ehi->probe_mask |= ATA_ALL_DEVICES; 3619 ehi->action |= ATA_EH_RESET; 3620 } 3621 } else { 3622 struct ata_device *dev = ata_find_dev(ap, devno); 3623 3624 if (dev) { 3625 struct ata_eh_info *ehi = &dev->link->eh_info; 3626 ehi->probe_mask |= 1 << dev->devno; 3627 ehi->action |= ATA_EH_RESET; 3628 } else 3629 rc = -EINVAL; 3630 } 3631 3632 if (rc == 0) { 3633 ata_port_schedule_eh(ap); 3634 spin_unlock_irqrestore(ap->lock, flags); 3635 ata_port_wait_eh(ap); 3636 } else 3637 spin_unlock_irqrestore(ap->lock, flags); 3638 3639 return rc; 3640 } 3641 3642 /** 3643 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3644 * @work: Pointer to ATA port to perform scsi_rescan_device() 3645 * 3646 * After ATA pass thru (SAT) commands are executed successfully, 3647 * libata need to propagate the changes to SCSI layer. This 3648 * function must be executed from ata_aux_wq such that sdev 3649 * attach/detach don't race with rescan. 3650 * 3651 * LOCKING: 3652 * Kernel thread context (may sleep). 3653 */ 3654 void ata_scsi_dev_rescan(struct work_struct *work) 3655 { 3656 struct ata_port *ap = 3657 container_of(work, struct ata_port, scsi_rescan_task); 3658 struct ata_link *link; 3659 struct ata_device *dev; 3660 unsigned long flags; 3661 3662 spin_lock_irqsave(ap->lock, flags); 3663 3664 ata_for_each_link(link, ap, EDGE) { 3665 ata_for_each_dev(dev, link, ENABLED) { 3666 struct scsi_device *sdev = dev->sdev; 3667 3668 if (!sdev) 3669 continue; 3670 if (scsi_device_get(sdev)) 3671 continue; 3672 3673 spin_unlock_irqrestore(ap->lock, flags); 3674 scsi_rescan_device(&(sdev->sdev_gendev)); 3675 scsi_device_put(sdev); 3676 spin_lock_irqsave(ap->lock, flags); 3677 } 3678 } 3679 3680 spin_unlock_irqrestore(ap->lock, flags); 3681 } 3682 3683 /** 3684 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3685 * @host: ATA host container for all SAS ports 3686 * @port_info: Information from low-level host driver 3687 * @shost: SCSI host that the scsi device is attached to 3688 * 3689 * LOCKING: 3690 * PCI/etc. bus probe sem. 3691 * 3692 * RETURNS: 3693 * ata_port pointer on success / NULL on failure. 3694 */ 3695 3696 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3697 struct ata_port_info *port_info, 3698 struct Scsi_Host *shost) 3699 { 3700 struct ata_port *ap; 3701 3702 ap = ata_port_alloc(host); 3703 if (!ap) 3704 return NULL; 3705 3706 ap->port_no = 0; 3707 ap->lock = shost->host_lock; 3708 ap->pio_mask = port_info->pio_mask; 3709 ap->mwdma_mask = port_info->mwdma_mask; 3710 ap->udma_mask = port_info->udma_mask; 3711 ap->flags |= port_info->flags; 3712 ap->ops = port_info->port_ops; 3713 ap->cbl = ATA_CBL_SATA; 3714 3715 return ap; 3716 } 3717 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3718 3719 /** 3720 * ata_sas_port_start - Set port up for dma. 3721 * @ap: Port to initialize 3722 * 3723 * Called just after data structures for each port are 3724 * initialized. 3725 * 3726 * May be used as the port_start() entry in ata_port_operations. 3727 * 3728 * LOCKING: 3729 * Inherited from caller. 3730 */ 3731 int ata_sas_port_start(struct ata_port *ap) 3732 { 3733 return 0; 3734 } 3735 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3736 3737 /** 3738 * ata_port_stop - Undo ata_sas_port_start() 3739 * @ap: Port to shut down 3740 * 3741 * May be used as the port_stop() entry in ata_port_operations. 3742 * 3743 * LOCKING: 3744 * Inherited from caller. 3745 */ 3746 3747 void ata_sas_port_stop(struct ata_port *ap) 3748 { 3749 } 3750 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3751 3752 /** 3753 * ata_sas_port_init - Initialize a SATA device 3754 * @ap: SATA port to initialize 3755 * 3756 * LOCKING: 3757 * PCI/etc. bus probe sem. 3758 * 3759 * RETURNS: 3760 * Zero on success, non-zero on error. 3761 */ 3762 3763 int ata_sas_port_init(struct ata_port *ap) 3764 { 3765 int rc = ap->ops->port_start(ap); 3766 3767 if (!rc) { 3768 ap->print_id = ata_print_id++; 3769 rc = ata_bus_probe(ap); 3770 } 3771 3772 return rc; 3773 } 3774 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3775 3776 /** 3777 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3778 * @ap: SATA port to destroy 3779 * 3780 */ 3781 3782 void ata_sas_port_destroy(struct ata_port *ap) 3783 { 3784 if (ap->ops->port_stop) 3785 ap->ops->port_stop(ap); 3786 kfree(ap); 3787 } 3788 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3789 3790 /** 3791 * ata_sas_slave_configure - Default slave_config routine for libata devices 3792 * @sdev: SCSI device to configure 3793 * @ap: ATA port to which SCSI device is attached 3794 * 3795 * RETURNS: 3796 * Zero. 3797 */ 3798 3799 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3800 { 3801 ata_scsi_sdev_config(sdev); 3802 ata_scsi_dev_config(sdev, ap->link.device); 3803 return 0; 3804 } 3805 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3806 3807 /** 3808 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3809 * @cmd: SCSI command to be sent 3810 * @done: Completion function, called when command is complete 3811 * @ap: ATA port to which the command is being sent 3812 * 3813 * RETURNS: 3814 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3815 * 0 otherwise. 3816 */ 3817 3818 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3819 struct ata_port *ap) 3820 { 3821 int rc = 0; 3822 3823 ata_scsi_dump_cdb(ap, cmd); 3824 3825 if (likely(ata_dev_enabled(ap->link.device))) 3826 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device); 3827 else { 3828 cmd->result = (DID_BAD_TARGET << 16); 3829 done(cmd); 3830 } 3831 return rc; 3832 } 3833 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3834