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