1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <linux/export.h> 41 #include <scsi/scsi.h> 42 #include <scsi/scsi_host.h> 43 #include <scsi/scsi_cmnd.h> 44 #include <scsi/scsi_eh.h> 45 #include <scsi/scsi_device.h> 46 #include <scsi/scsi_tcq.h> 47 #include <scsi/scsi_transport.h> 48 #include <linux/libata.h> 49 #include <linux/hdreg.h> 50 #include <linux/uaccess.h> 51 #include <linux/suspend.h> 52 #include <asm/unaligned.h> 53 54 #include "libata.h" 55 #include "libata-transport.h" 56 57 #define ATA_SCSI_RBUF_SIZE 4096 58 59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 61 62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 63 64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 67 const struct scsi_device *scsidev); 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 static const char *ata_lpm_policy_names[] = { 108 [ATA_LPM_UNKNOWN] = "max_performance", 109 [ATA_LPM_MAX_POWER] = "max_performance", 110 [ATA_LPM_MED_POWER] = "medium_power", 111 [ATA_LPM_MIN_POWER] = "min_power", 112 }; 113 114 static ssize_t ata_scsi_lpm_store(struct device *dev, 115 struct device_attribute *attr, 116 const char *buf, size_t count) 117 { 118 struct Scsi_Host *shost = class_to_shost(dev); 119 struct ata_port *ap = ata_shost_to_port(shost); 120 enum ata_lpm_policy policy; 121 unsigned long flags; 122 123 /* UNKNOWN is internal state, iterate from MAX_POWER */ 124 for (policy = ATA_LPM_MAX_POWER; 125 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 126 const char *name = ata_lpm_policy_names[policy]; 127 128 if (strncmp(name, buf, strlen(name)) == 0) 129 break; 130 } 131 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 132 return -EINVAL; 133 134 spin_lock_irqsave(ap->lock, flags); 135 ap->target_lpm_policy = policy; 136 ata_port_schedule_eh(ap); 137 spin_unlock_irqrestore(ap->lock, flags); 138 139 return count; 140 } 141 142 static ssize_t ata_scsi_lpm_show(struct device *dev, 143 struct device_attribute *attr, char *buf) 144 { 145 struct Scsi_Host *shost = class_to_shost(dev); 146 struct ata_port *ap = ata_shost_to_port(shost); 147 148 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 149 return -EINVAL; 150 151 return snprintf(buf, PAGE_SIZE, "%s\n", 152 ata_lpm_policy_names[ap->target_lpm_policy]); 153 } 154 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 155 ata_scsi_lpm_show, ata_scsi_lpm_store); 156 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 157 158 static ssize_t ata_scsi_park_show(struct device *device, 159 struct device_attribute *attr, char *buf) 160 { 161 struct scsi_device *sdev = to_scsi_device(device); 162 struct ata_port *ap; 163 struct ata_link *link; 164 struct ata_device *dev; 165 unsigned long flags, now; 166 unsigned int uninitialized_var(msecs); 167 int rc = 0; 168 169 ap = ata_shost_to_port(sdev->host); 170 171 spin_lock_irqsave(ap->lock, flags); 172 dev = ata_scsi_find_dev(ap, sdev); 173 if (!dev) { 174 rc = -ENODEV; 175 goto unlock; 176 } 177 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 178 rc = -EOPNOTSUPP; 179 goto unlock; 180 } 181 182 link = dev->link; 183 now = jiffies; 184 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 185 link->eh_context.unloaded_mask & (1 << dev->devno) && 186 time_after(dev->unpark_deadline, now)) 187 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 188 else 189 msecs = 0; 190 191 unlock: 192 spin_unlock_irq(ap->lock); 193 194 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 195 } 196 197 static ssize_t ata_scsi_park_store(struct device *device, 198 struct device_attribute *attr, 199 const char *buf, size_t len) 200 { 201 struct scsi_device *sdev = to_scsi_device(device); 202 struct ata_port *ap; 203 struct ata_device *dev; 204 long int input; 205 unsigned long flags; 206 int rc; 207 208 rc = strict_strtol(buf, 10, &input); 209 if (rc || input < -2) 210 return -EINVAL; 211 if (input > ATA_TMOUT_MAX_PARK) { 212 rc = -EOVERFLOW; 213 input = ATA_TMOUT_MAX_PARK; 214 } 215 216 ap = ata_shost_to_port(sdev->host); 217 218 spin_lock_irqsave(ap->lock, flags); 219 dev = ata_scsi_find_dev(ap, sdev); 220 if (unlikely(!dev)) { 221 rc = -ENODEV; 222 goto unlock; 223 } 224 if (dev->class != ATA_DEV_ATA) { 225 rc = -EOPNOTSUPP; 226 goto unlock; 227 } 228 229 if (input >= 0) { 230 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 231 rc = -EOPNOTSUPP; 232 goto unlock; 233 } 234 235 dev->unpark_deadline = ata_deadline(jiffies, input); 236 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 237 ata_port_schedule_eh(ap); 238 complete(&ap->park_req_pending); 239 } else { 240 switch (input) { 241 case -1: 242 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 243 break; 244 case -2: 245 dev->flags |= ATA_DFLAG_NO_UNLOAD; 246 break; 247 } 248 } 249 unlock: 250 spin_unlock_irqrestore(ap->lock, flags); 251 252 return rc ? rc : len; 253 } 254 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 255 ata_scsi_park_show, ata_scsi_park_store); 256 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 257 258 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 259 { 260 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 261 262 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 263 } 264 265 static ssize_t 266 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 267 const char *buf, size_t count) 268 { 269 struct Scsi_Host *shost = class_to_shost(dev); 270 struct ata_port *ap = ata_shost_to_port(shost); 271 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 272 return ap->ops->em_store(ap, buf, count); 273 return -EINVAL; 274 } 275 276 static ssize_t 277 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 278 char *buf) 279 { 280 struct Scsi_Host *shost = class_to_shost(dev); 281 struct ata_port *ap = ata_shost_to_port(shost); 282 283 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 284 return ap->ops->em_show(ap, buf); 285 return -EINVAL; 286 } 287 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 288 ata_scsi_em_message_show, ata_scsi_em_message_store); 289 EXPORT_SYMBOL_GPL(dev_attr_em_message); 290 291 static ssize_t 292 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 293 char *buf) 294 { 295 struct Scsi_Host *shost = class_to_shost(dev); 296 struct ata_port *ap = ata_shost_to_port(shost); 297 298 return snprintf(buf, 23, "%d\n", ap->em_message_type); 299 } 300 DEVICE_ATTR(em_message_type, S_IRUGO, 301 ata_scsi_em_message_type_show, NULL); 302 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 303 304 static ssize_t 305 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 306 char *buf) 307 { 308 struct scsi_device *sdev = to_scsi_device(dev); 309 struct ata_port *ap = ata_shost_to_port(sdev->host); 310 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 311 312 if (atadev && ap->ops->sw_activity_show && 313 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 314 return ap->ops->sw_activity_show(atadev, buf); 315 return -EINVAL; 316 } 317 318 static ssize_t 319 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 320 const char *buf, size_t count) 321 { 322 struct scsi_device *sdev = to_scsi_device(dev); 323 struct ata_port *ap = ata_shost_to_port(sdev->host); 324 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 325 enum sw_activity val; 326 int rc; 327 328 if (atadev && ap->ops->sw_activity_store && 329 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 330 val = simple_strtoul(buf, NULL, 0); 331 switch (val) { 332 case OFF: case BLINK_ON: case BLINK_OFF: 333 rc = ap->ops->sw_activity_store(atadev, val); 334 if (!rc) 335 return count; 336 else 337 return rc; 338 } 339 } 340 return -EINVAL; 341 } 342 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 343 ata_scsi_activity_store); 344 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 345 346 struct device_attribute *ata_common_sdev_attrs[] = { 347 &dev_attr_unload_heads, 348 NULL 349 }; 350 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 351 352 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 353 { 354 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 355 /* "Invalid field in cbd" */ 356 cmd->scsi_done(cmd); 357 } 358 359 /** 360 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 361 * @sdev: SCSI device for which BIOS geometry is to be determined 362 * @bdev: block device associated with @sdev 363 * @capacity: capacity of SCSI device 364 * @geom: location to which geometry will be output 365 * 366 * Generic bios head/sector/cylinder calculator 367 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 368 * mapping. Some situations may arise where the disk is not 369 * bootable if this is not used. 370 * 371 * LOCKING: 372 * Defined by the SCSI layer. We don't really care. 373 * 374 * RETURNS: 375 * Zero. 376 */ 377 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 378 sector_t capacity, int geom[]) 379 { 380 geom[0] = 255; 381 geom[1] = 63; 382 sector_div(capacity, 255*63); 383 geom[2] = capacity; 384 385 return 0; 386 } 387 388 /** 389 * ata_scsi_unlock_native_capacity - unlock native capacity 390 * @sdev: SCSI device to adjust device capacity for 391 * 392 * This function is called if a partition on @sdev extends beyond 393 * the end of the device. It requests EH to unlock HPA. 394 * 395 * LOCKING: 396 * Defined by the SCSI layer. Might sleep. 397 */ 398 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 399 { 400 struct ata_port *ap = ata_shost_to_port(sdev->host); 401 struct ata_device *dev; 402 unsigned long flags; 403 404 spin_lock_irqsave(ap->lock, flags); 405 406 dev = ata_scsi_find_dev(ap, sdev); 407 if (dev && dev->n_sectors < dev->n_native_sectors) { 408 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 409 dev->link->eh_info.action |= ATA_EH_RESET; 410 ata_port_schedule_eh(ap); 411 } 412 413 spin_unlock_irqrestore(ap->lock, flags); 414 ata_port_wait_eh(ap); 415 } 416 417 /** 418 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 419 * @ap: target port 420 * @sdev: SCSI device to get identify data for 421 * @arg: User buffer area for identify data 422 * 423 * LOCKING: 424 * Defined by the SCSI layer. We don't really care. 425 * 426 * RETURNS: 427 * Zero on success, negative errno on error. 428 */ 429 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 430 void __user *arg) 431 { 432 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 433 u16 __user *dst = arg; 434 char buf[40]; 435 436 if (!dev) 437 return -ENOMSG; 438 439 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 440 return -EFAULT; 441 442 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 443 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 444 return -EFAULT; 445 446 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 447 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 448 return -EFAULT; 449 450 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 451 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 452 return -EFAULT; 453 454 return 0; 455 } 456 457 /** 458 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 459 * @scsidev: Device to which we are issuing command 460 * @arg: User provided data for issuing command 461 * 462 * LOCKING: 463 * Defined by the SCSI layer. We don't really care. 464 * 465 * RETURNS: 466 * Zero on success, negative errno on error. 467 */ 468 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 469 { 470 int rc = 0; 471 u8 scsi_cmd[MAX_COMMAND_SIZE]; 472 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 473 int argsize = 0; 474 enum dma_data_direction data_dir; 475 int cmd_result; 476 477 if (arg == NULL) 478 return -EINVAL; 479 480 if (copy_from_user(args, arg, sizeof(args))) 481 return -EFAULT; 482 483 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 484 if (!sensebuf) 485 return -ENOMEM; 486 487 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 488 489 if (args[3]) { 490 argsize = ATA_SECT_SIZE * args[3]; 491 argbuf = kmalloc(argsize, GFP_KERNEL); 492 if (argbuf == NULL) { 493 rc = -ENOMEM; 494 goto error; 495 } 496 497 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 498 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 499 block count in sector count field */ 500 data_dir = DMA_FROM_DEVICE; 501 } else { 502 scsi_cmd[1] = (3 << 1); /* Non-data */ 503 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 504 data_dir = DMA_NONE; 505 } 506 507 scsi_cmd[0] = ATA_16; 508 509 scsi_cmd[4] = args[2]; 510 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 511 scsi_cmd[6] = args[3]; 512 scsi_cmd[8] = args[1]; 513 scsi_cmd[10] = 0x4f; 514 scsi_cmd[12] = 0xc2; 515 } else { 516 scsi_cmd[6] = args[1]; 517 } 518 scsi_cmd[14] = args[0]; 519 520 /* Good values for timeout and retries? Values below 521 from scsi_ioctl_send_command() for default case... */ 522 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 523 sensebuf, (10*HZ), 5, 0, NULL); 524 525 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 526 u8 *desc = sensebuf + 8; 527 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 528 529 /* If we set cc then ATA pass-through will cause a 530 * check condition even if no error. Filter that. */ 531 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 532 struct scsi_sense_hdr sshdr; 533 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 534 &sshdr); 535 if (sshdr.sense_key == 0 && 536 sshdr.asc == 0 && sshdr.ascq == 0) 537 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 538 } 539 540 /* Send userspace a few ATA registers (same as drivers/ide) */ 541 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 542 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 543 args[0] = desc[13]; /* status */ 544 args[1] = desc[3]; /* error */ 545 args[2] = desc[5]; /* sector count (0:7) */ 546 if (copy_to_user(arg, args, sizeof(args))) 547 rc = -EFAULT; 548 } 549 } 550 551 552 if (cmd_result) { 553 rc = -EIO; 554 goto error; 555 } 556 557 if ((argbuf) 558 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 559 rc = -EFAULT; 560 error: 561 kfree(sensebuf); 562 kfree(argbuf); 563 return rc; 564 } 565 566 /** 567 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 568 * @scsidev: Device to which we are issuing command 569 * @arg: User provided data for issuing command 570 * 571 * LOCKING: 572 * Defined by the SCSI layer. We don't really care. 573 * 574 * RETURNS: 575 * Zero on success, negative errno on error. 576 */ 577 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 578 { 579 int rc = 0; 580 u8 scsi_cmd[MAX_COMMAND_SIZE]; 581 u8 args[7], *sensebuf = NULL; 582 int cmd_result; 583 584 if (arg == NULL) 585 return -EINVAL; 586 587 if (copy_from_user(args, arg, sizeof(args))) 588 return -EFAULT; 589 590 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 591 if (!sensebuf) 592 return -ENOMEM; 593 594 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 595 scsi_cmd[0] = ATA_16; 596 scsi_cmd[1] = (3 << 1); /* Non-data */ 597 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 598 scsi_cmd[4] = args[1]; 599 scsi_cmd[6] = args[2]; 600 scsi_cmd[8] = args[3]; 601 scsi_cmd[10] = args[4]; 602 scsi_cmd[12] = args[5]; 603 scsi_cmd[13] = args[6] & 0x4f; 604 scsi_cmd[14] = args[0]; 605 606 /* Good values for timeout and retries? Values below 607 from scsi_ioctl_send_command() for default case... */ 608 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 609 sensebuf, (10*HZ), 5, 0, NULL); 610 611 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 612 u8 *desc = sensebuf + 8; 613 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 614 615 /* If we set cc then ATA pass-through will cause a 616 * check condition even if no error. Filter that. */ 617 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 618 struct scsi_sense_hdr sshdr; 619 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 620 &sshdr); 621 if (sshdr.sense_key == 0 && 622 sshdr.asc == 0 && sshdr.ascq == 0) 623 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 624 } 625 626 /* Send userspace ATA registers */ 627 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 628 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 629 args[0] = desc[13]; /* status */ 630 args[1] = desc[3]; /* error */ 631 args[2] = desc[5]; /* sector count (0:7) */ 632 args[3] = desc[7]; /* lbal */ 633 args[4] = desc[9]; /* lbam */ 634 args[5] = desc[11]; /* lbah */ 635 args[6] = desc[12]; /* select */ 636 if (copy_to_user(arg, args, sizeof(args))) 637 rc = -EFAULT; 638 } 639 } 640 641 if (cmd_result) { 642 rc = -EIO; 643 goto error; 644 } 645 646 error: 647 kfree(sensebuf); 648 return rc; 649 } 650 651 static int ata_ioc32(struct ata_port *ap) 652 { 653 if (ap->flags & ATA_FLAG_PIO_DMA) 654 return 1; 655 if (ap->pflags & ATA_PFLAG_PIO32) 656 return 1; 657 return 0; 658 } 659 660 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 661 int cmd, void __user *arg) 662 { 663 int val = -EINVAL, rc = -EINVAL; 664 unsigned long flags; 665 666 switch (cmd) { 667 case ATA_IOC_GET_IO32: 668 spin_lock_irqsave(ap->lock, flags); 669 val = ata_ioc32(ap); 670 spin_unlock_irqrestore(ap->lock, flags); 671 if (copy_to_user(arg, &val, 1)) 672 return -EFAULT; 673 return 0; 674 675 case ATA_IOC_SET_IO32: 676 val = (unsigned long) arg; 677 rc = 0; 678 spin_lock_irqsave(ap->lock, flags); 679 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 680 if (val) 681 ap->pflags |= ATA_PFLAG_PIO32; 682 else 683 ap->pflags &= ~ATA_PFLAG_PIO32; 684 } else { 685 if (val != ata_ioc32(ap)) 686 rc = -EINVAL; 687 } 688 spin_unlock_irqrestore(ap->lock, flags); 689 return rc; 690 691 case HDIO_GET_IDENTITY: 692 return ata_get_identity(ap, scsidev, arg); 693 694 case HDIO_DRIVE_CMD: 695 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 696 return -EACCES; 697 return ata_cmd_ioctl(scsidev, arg); 698 699 case HDIO_DRIVE_TASK: 700 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 701 return -EACCES; 702 return ata_task_ioctl(scsidev, arg); 703 704 default: 705 rc = -ENOTTY; 706 break; 707 } 708 709 return rc; 710 } 711 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 712 713 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 714 { 715 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 716 scsidev, cmd, arg); 717 } 718 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 719 720 /** 721 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 722 * @dev: ATA device to which the new command is attached 723 * @cmd: SCSI command that originated this ATA command 724 * 725 * Obtain a reference to an unused ata_queued_cmd structure, 726 * which is the basic libata structure representing a single 727 * ATA command sent to the hardware. 728 * 729 * If a command was available, fill in the SCSI-specific 730 * portions of the structure with information on the 731 * current command. 732 * 733 * LOCKING: 734 * spin_lock_irqsave(host lock) 735 * 736 * RETURNS: 737 * Command allocated, or %NULL if none available. 738 */ 739 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 740 struct scsi_cmnd *cmd) 741 { 742 struct ata_queued_cmd *qc; 743 744 qc = ata_qc_new_init(dev); 745 if (qc) { 746 qc->scsicmd = cmd; 747 qc->scsidone = cmd->scsi_done; 748 749 qc->sg = scsi_sglist(cmd); 750 qc->n_elem = scsi_sg_count(cmd); 751 } else { 752 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 753 cmd->scsi_done(cmd); 754 } 755 756 return qc; 757 } 758 759 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 760 { 761 struct scsi_cmnd *scmd = qc->scsicmd; 762 763 qc->extrabytes = scmd->request->extra_len; 764 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 765 } 766 767 /** 768 * ata_dump_status - user friendly display of error info 769 * @id: id of the port in question 770 * @tf: ptr to filled out taskfile 771 * 772 * Decode and dump the ATA error/status registers for the user so 773 * that they have some idea what really happened at the non 774 * make-believe layer. 775 * 776 * LOCKING: 777 * inherited from caller 778 */ 779 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 780 { 781 u8 stat = tf->command, err = tf->feature; 782 783 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 784 if (stat & ATA_BUSY) { 785 printk("Busy }\n"); /* Data is not valid in this case */ 786 } else { 787 if (stat & 0x40) printk("DriveReady "); 788 if (stat & 0x20) printk("DeviceFault "); 789 if (stat & 0x10) printk("SeekComplete "); 790 if (stat & 0x08) printk("DataRequest "); 791 if (stat & 0x04) printk("CorrectedError "); 792 if (stat & 0x02) printk("Index "); 793 if (stat & 0x01) printk("Error "); 794 printk("}\n"); 795 796 if (err) { 797 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 798 if (err & 0x04) printk("DriveStatusError "); 799 if (err & 0x80) { 800 if (err & 0x04) printk("BadCRC "); 801 else printk("Sector "); 802 } 803 if (err & 0x40) printk("UncorrectableError "); 804 if (err & 0x10) printk("SectorIdNotFound "); 805 if (err & 0x02) printk("TrackZeroNotFound "); 806 if (err & 0x01) printk("AddrMarkNotFound "); 807 printk("}\n"); 808 } 809 } 810 } 811 812 /** 813 * ata_to_sense_error - convert ATA error to SCSI error 814 * @id: ATA device number 815 * @drv_stat: value contained in ATA status register 816 * @drv_err: value contained in ATA error register 817 * @sk: the sense key we'll fill out 818 * @asc: the additional sense code we'll fill out 819 * @ascq: the additional sense code qualifier we'll fill out 820 * @verbose: be verbose 821 * 822 * Converts an ATA error into a SCSI error. Fill out pointers to 823 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 824 * format sense blocks. 825 * 826 * LOCKING: 827 * spin_lock_irqsave(host lock) 828 */ 829 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 830 u8 *asc, u8 *ascq, int verbose) 831 { 832 int i; 833 834 /* Based on the 3ware driver translation table */ 835 static const unsigned char sense_table[][4] = { 836 /* BBD|ECC|ID|MAR */ 837 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 838 /* BBD|ECC|ID */ 839 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 840 /* ECC|MC|MARK */ 841 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 842 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 843 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 844 /* MC|ID|ABRT|TRK0|MARK */ 845 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 846 /* MCR|MARK */ 847 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 848 /* Bad address mark */ 849 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 850 /* TRK0 */ 851 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 852 /* Abort & !ICRC */ 853 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 854 /* Media change request */ 855 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 856 /* SRV */ 857 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 858 /* Media change */ 859 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 860 /* ECC */ 861 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 862 /* BBD - block marked bad */ 863 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 864 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 865 }; 866 static const unsigned char stat_table[][4] = { 867 /* Must be first because BUSY means no other bits valid */ 868 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 869 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 870 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 871 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 872 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 873 }; 874 875 /* 876 * Is this an error we can process/parse 877 */ 878 if (drv_stat & ATA_BUSY) { 879 drv_err = 0; /* Ignore the err bits, they're invalid */ 880 } 881 882 if (drv_err) { 883 /* Look for drv_err */ 884 for (i = 0; sense_table[i][0] != 0xFF; i++) { 885 /* Look for best matches first */ 886 if ((sense_table[i][0] & drv_err) == 887 sense_table[i][0]) { 888 *sk = sense_table[i][1]; 889 *asc = sense_table[i][2]; 890 *ascq = sense_table[i][3]; 891 goto translate_done; 892 } 893 } 894 /* No immediate match */ 895 if (verbose) 896 printk(KERN_WARNING "ata%u: no sense translation for " 897 "error 0x%02x\n", id, drv_err); 898 } 899 900 /* Fall back to interpreting status bits */ 901 for (i = 0; stat_table[i][0] != 0xFF; i++) { 902 if (stat_table[i][0] & drv_stat) { 903 *sk = stat_table[i][1]; 904 *asc = stat_table[i][2]; 905 *ascq = stat_table[i][3]; 906 goto translate_done; 907 } 908 } 909 /* No error? Undecoded? */ 910 if (verbose) 911 printk(KERN_WARNING "ata%u: no sense translation for " 912 "status: 0x%02x\n", id, drv_stat); 913 914 /* We need a sensible error return here, which is tricky, and one 915 that won't cause people to do things like return a disk wrongly */ 916 *sk = ABORTED_COMMAND; 917 *asc = 0x00; 918 *ascq = 0x00; 919 920 translate_done: 921 if (verbose) 922 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 923 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 924 id, drv_stat, drv_err, *sk, *asc, *ascq); 925 return; 926 } 927 928 /* 929 * ata_gen_passthru_sense - Generate check condition sense block. 930 * @qc: Command that completed. 931 * 932 * This function is specific to the ATA descriptor format sense 933 * block specified for the ATA pass through commands. Regardless 934 * of whether the command errored or not, return a sense 935 * block. Copy all controller registers into the sense 936 * block. Clear sense key, ASC & ASCQ if there is no error. 937 * 938 * LOCKING: 939 * None. 940 */ 941 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 942 { 943 struct scsi_cmnd *cmd = qc->scsicmd; 944 struct ata_taskfile *tf = &qc->result_tf; 945 unsigned char *sb = cmd->sense_buffer; 946 unsigned char *desc = sb + 8; 947 int verbose = qc->ap->ops->error_handler == NULL; 948 949 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 950 951 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 952 953 /* 954 * Use ata_to_sense_error() to map status register bits 955 * onto sense key, asc & ascq. 956 */ 957 if (qc->err_mask || 958 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 959 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 960 &sb[1], &sb[2], &sb[3], verbose); 961 sb[1] &= 0x0f; 962 } 963 964 /* 965 * Sense data is current and format is descriptor. 966 */ 967 sb[0] = 0x72; 968 969 desc[0] = 0x09; 970 971 /* set length of additional sense data */ 972 sb[7] = 14; 973 desc[1] = 12; 974 975 /* 976 * Copy registers into sense buffer. 977 */ 978 desc[2] = 0x00; 979 desc[3] = tf->feature; /* == error reg */ 980 desc[5] = tf->nsect; 981 desc[7] = tf->lbal; 982 desc[9] = tf->lbam; 983 desc[11] = tf->lbah; 984 desc[12] = tf->device; 985 desc[13] = tf->command; /* == status reg */ 986 987 /* 988 * Fill in Extend bit, and the high order bytes 989 * if applicable. 990 */ 991 if (tf->flags & ATA_TFLAG_LBA48) { 992 desc[2] |= 0x01; 993 desc[4] = tf->hob_nsect; 994 desc[6] = tf->hob_lbal; 995 desc[8] = tf->hob_lbam; 996 desc[10] = tf->hob_lbah; 997 } 998 } 999 1000 /** 1001 * ata_gen_ata_sense - generate a SCSI fixed sense block 1002 * @qc: Command that we are erroring out 1003 * 1004 * Generate sense block for a failed ATA command @qc. Descriptor 1005 * format is used to accommodate LBA48 block address. 1006 * 1007 * LOCKING: 1008 * None. 1009 */ 1010 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1011 { 1012 struct ata_device *dev = qc->dev; 1013 struct scsi_cmnd *cmd = qc->scsicmd; 1014 struct ata_taskfile *tf = &qc->result_tf; 1015 unsigned char *sb = cmd->sense_buffer; 1016 unsigned char *desc = sb + 8; 1017 int verbose = qc->ap->ops->error_handler == NULL; 1018 u64 block; 1019 1020 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1021 1022 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1023 1024 /* sense data is current and format is descriptor */ 1025 sb[0] = 0x72; 1026 1027 /* Use ata_to_sense_error() to map status register bits 1028 * onto sense key, asc & ascq. 1029 */ 1030 if (qc->err_mask || 1031 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1032 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1033 &sb[1], &sb[2], &sb[3], verbose); 1034 sb[1] &= 0x0f; 1035 } 1036 1037 block = ata_tf_read_block(&qc->result_tf, dev); 1038 1039 /* information sense data descriptor */ 1040 sb[7] = 12; 1041 desc[0] = 0x00; 1042 desc[1] = 10; 1043 1044 desc[2] |= 0x80; /* valid */ 1045 desc[6] = block >> 40; 1046 desc[7] = block >> 32; 1047 desc[8] = block >> 24; 1048 desc[9] = block >> 16; 1049 desc[10] = block >> 8; 1050 desc[11] = block; 1051 } 1052 1053 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1054 { 1055 sdev->use_10_for_rw = 1; 1056 sdev->use_10_for_ms = 1; 1057 sdev->no_report_opcodes = 1; 1058 sdev->no_write_same = 1; 1059 1060 /* Schedule policy is determined by ->qc_defer() callback and 1061 * it needs to see every deferred qc. Set dev_blocked to 1 to 1062 * prevent SCSI midlayer from automatically deferring 1063 * requests. 1064 */ 1065 sdev->max_device_blocked = 1; 1066 } 1067 1068 /** 1069 * atapi_drain_needed - Check whether data transfer may overflow 1070 * @rq: request to be checked 1071 * 1072 * ATAPI commands which transfer variable length data to host 1073 * might overflow due to application error or hardare bug. This 1074 * function checks whether overflow should be drained and ignored 1075 * for @request. 1076 * 1077 * LOCKING: 1078 * None. 1079 * 1080 * RETURNS: 1081 * 1 if ; otherwise, 0. 1082 */ 1083 static int atapi_drain_needed(struct request *rq) 1084 { 1085 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1086 return 0; 1087 1088 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1089 return 0; 1090 1091 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1092 } 1093 1094 static int ata_scsi_dev_config(struct scsi_device *sdev, 1095 struct ata_device *dev) 1096 { 1097 struct request_queue *q = sdev->request_queue; 1098 1099 if (!ata_id_has_unload(dev->id)) 1100 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1101 1102 /* configure max sectors */ 1103 blk_queue_max_hw_sectors(q, dev->max_sectors); 1104 1105 if (dev->class == ATA_DEV_ATAPI) { 1106 void *buf; 1107 1108 sdev->sector_size = ATA_SECT_SIZE; 1109 1110 /* set DMA padding */ 1111 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1112 1113 /* configure draining */ 1114 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1115 if (!buf) { 1116 ata_dev_err(dev, "drain buffer allocation failed\n"); 1117 return -ENOMEM; 1118 } 1119 1120 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1121 } else { 1122 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1123 sdev->manage_start_stop = 1; 1124 } 1125 1126 /* 1127 * ata_pio_sectors() expects buffer for each sector to not cross 1128 * page boundary. Enforce it by requiring buffers to be sector 1129 * aligned, which works iff sector_size is not larger than 1130 * PAGE_SIZE. ATAPI devices also need the alignment as 1131 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1132 */ 1133 if (sdev->sector_size > PAGE_SIZE) 1134 ata_dev_warn(dev, 1135 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1136 sdev->sector_size); 1137 1138 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1139 1140 if (dev->flags & ATA_DFLAG_AN) 1141 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1142 1143 if (dev->flags & ATA_DFLAG_NCQ) { 1144 int depth; 1145 1146 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1147 depth = min(ATA_MAX_QUEUE - 1, depth); 1148 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1149 } 1150 1151 blk_queue_flush_queueable(q, false); 1152 1153 dev->sdev = sdev; 1154 return 0; 1155 } 1156 1157 /** 1158 * ata_scsi_slave_config - Set SCSI device attributes 1159 * @sdev: SCSI device to examine 1160 * 1161 * This is called before we actually start reading 1162 * and writing to the device, to configure certain 1163 * SCSI mid-layer behaviors. 1164 * 1165 * LOCKING: 1166 * Defined by SCSI layer. We don't really care. 1167 */ 1168 1169 int ata_scsi_slave_config(struct scsi_device *sdev) 1170 { 1171 struct ata_port *ap = ata_shost_to_port(sdev->host); 1172 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1173 int rc = 0; 1174 1175 ata_scsi_sdev_config(sdev); 1176 1177 if (dev) 1178 rc = ata_scsi_dev_config(sdev, dev); 1179 1180 return rc; 1181 } 1182 1183 /** 1184 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1185 * @sdev: SCSI device to be destroyed 1186 * 1187 * @sdev is about to be destroyed for hot/warm unplugging. If 1188 * this unplugging was initiated by libata as indicated by NULL 1189 * dev->sdev, this function doesn't have to do anything. 1190 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1191 * Clear dev->sdev, schedule the device for ATA detach and invoke 1192 * EH. 1193 * 1194 * LOCKING: 1195 * Defined by SCSI layer. We don't really care. 1196 */ 1197 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1198 { 1199 struct ata_port *ap = ata_shost_to_port(sdev->host); 1200 struct request_queue *q = sdev->request_queue; 1201 unsigned long flags; 1202 struct ata_device *dev; 1203 1204 if (!ap->ops->error_handler) 1205 return; 1206 1207 spin_lock_irqsave(ap->lock, flags); 1208 dev = __ata_scsi_find_dev(ap, sdev); 1209 if (dev && dev->sdev) { 1210 /* SCSI device already in CANCEL state, no need to offline it */ 1211 dev->sdev = NULL; 1212 dev->flags |= ATA_DFLAG_DETACH; 1213 ata_port_schedule_eh(ap); 1214 } 1215 spin_unlock_irqrestore(ap->lock, flags); 1216 1217 kfree(q->dma_drain_buffer); 1218 q->dma_drain_buffer = NULL; 1219 q->dma_drain_size = 0; 1220 } 1221 1222 /** 1223 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1224 * @ap: ATA port to which the device change the queue depth 1225 * @sdev: SCSI device to configure queue depth for 1226 * @queue_depth: new queue depth 1227 * @reason: calling context 1228 * 1229 * libsas and libata have different approaches for associating a sdev to 1230 * its ata_port. 1231 * 1232 */ 1233 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1234 int queue_depth, int reason) 1235 { 1236 struct ata_device *dev; 1237 unsigned long flags; 1238 1239 if (reason != SCSI_QDEPTH_DEFAULT) 1240 return -EOPNOTSUPP; 1241 1242 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1243 return sdev->queue_depth; 1244 1245 dev = ata_scsi_find_dev(ap, sdev); 1246 if (!dev || !ata_dev_enabled(dev)) 1247 return sdev->queue_depth; 1248 1249 /* NCQ enabled? */ 1250 spin_lock_irqsave(ap->lock, flags); 1251 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1252 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1253 dev->flags |= ATA_DFLAG_NCQ_OFF; 1254 queue_depth = 1; 1255 } 1256 spin_unlock_irqrestore(ap->lock, flags); 1257 1258 /* limit and apply queue depth */ 1259 queue_depth = min(queue_depth, sdev->host->can_queue); 1260 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1261 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1262 1263 if (sdev->queue_depth == queue_depth) 1264 return -EINVAL; 1265 1266 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1267 return queue_depth; 1268 } 1269 1270 /** 1271 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1272 * @sdev: SCSI device to configure queue depth for 1273 * @queue_depth: new queue depth 1274 * @reason: calling context 1275 * 1276 * This is libata standard hostt->change_queue_depth callback. 1277 * SCSI will call into this callback when user tries to set queue 1278 * depth via sysfs. 1279 * 1280 * LOCKING: 1281 * SCSI layer (we don't care) 1282 * 1283 * RETURNS: 1284 * Newly configured queue depth. 1285 */ 1286 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1287 int reason) 1288 { 1289 struct ata_port *ap = ata_shost_to_port(sdev->host); 1290 1291 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1292 } 1293 1294 /** 1295 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1296 * @qc: Storage for translated ATA taskfile 1297 * 1298 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1299 * (to start). Perhaps these commands should be preceded by 1300 * CHECK POWER MODE to see what power mode the device is already in. 1301 * [See SAT revision 5 at www.t10.org] 1302 * 1303 * LOCKING: 1304 * spin_lock_irqsave(host lock) 1305 * 1306 * RETURNS: 1307 * Zero on success, non-zero on error. 1308 */ 1309 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1310 { 1311 struct scsi_cmnd *scmd = qc->scsicmd; 1312 struct ata_taskfile *tf = &qc->tf; 1313 const u8 *cdb = scmd->cmnd; 1314 1315 if (scmd->cmd_len < 5) 1316 goto invalid_fld; 1317 1318 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1319 tf->protocol = ATA_PROT_NODATA; 1320 if (cdb[1] & 0x1) { 1321 ; /* ignore IMMED bit, violates sat-r05 */ 1322 } 1323 if (cdb[4] & 0x2) 1324 goto invalid_fld; /* LOEJ bit set not supported */ 1325 if (((cdb[4] >> 4) & 0xf) != 0) 1326 goto invalid_fld; /* power conditions not supported */ 1327 1328 if (cdb[4] & 0x1) { 1329 tf->nsect = 1; /* 1 sector, lba=0 */ 1330 1331 if (qc->dev->flags & ATA_DFLAG_LBA) { 1332 tf->flags |= ATA_TFLAG_LBA; 1333 1334 tf->lbah = 0x0; 1335 tf->lbam = 0x0; 1336 tf->lbal = 0x0; 1337 tf->device |= ATA_LBA; 1338 } else { 1339 /* CHS */ 1340 tf->lbal = 0x1; /* sect */ 1341 tf->lbam = 0x0; /* cyl low */ 1342 tf->lbah = 0x0; /* cyl high */ 1343 } 1344 1345 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1346 } else { 1347 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1348 * or S5) causing some drives to spin up and down again. 1349 */ 1350 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1351 system_state == SYSTEM_POWER_OFF) 1352 goto skip; 1353 1354 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1355 system_entering_hibernation()) 1356 goto skip; 1357 1358 /* Issue ATA STANDBY IMMEDIATE command */ 1359 tf->command = ATA_CMD_STANDBYNOW1; 1360 } 1361 1362 /* 1363 * Standby and Idle condition timers could be implemented but that 1364 * would require libata to implement the Power condition mode page 1365 * and allow the user to change it. Changing mode pages requires 1366 * MODE SELECT to be implemented. 1367 */ 1368 1369 return 0; 1370 1371 invalid_fld: 1372 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1373 /* "Invalid field in cbd" */ 1374 return 1; 1375 skip: 1376 scmd->result = SAM_STAT_GOOD; 1377 return 1; 1378 } 1379 1380 1381 /** 1382 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1383 * @qc: Storage for translated ATA taskfile 1384 * 1385 * Sets up an ATA taskfile to issue FLUSH CACHE or 1386 * FLUSH CACHE EXT. 1387 * 1388 * LOCKING: 1389 * spin_lock_irqsave(host lock) 1390 * 1391 * RETURNS: 1392 * Zero on success, non-zero on error. 1393 */ 1394 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1395 { 1396 struct ata_taskfile *tf = &qc->tf; 1397 1398 tf->flags |= ATA_TFLAG_DEVICE; 1399 tf->protocol = ATA_PROT_NODATA; 1400 1401 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1402 tf->command = ATA_CMD_FLUSH_EXT; 1403 else 1404 tf->command = ATA_CMD_FLUSH; 1405 1406 /* flush is critical for IO integrity, consider it an IO command */ 1407 qc->flags |= ATA_QCFLAG_IO; 1408 1409 return 0; 1410 } 1411 1412 /** 1413 * scsi_6_lba_len - Get LBA and transfer length 1414 * @cdb: SCSI command to translate 1415 * 1416 * Calculate LBA and transfer length for 6-byte commands. 1417 * 1418 * RETURNS: 1419 * @plba: the LBA 1420 * @plen: the transfer length 1421 */ 1422 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1423 { 1424 u64 lba = 0; 1425 u32 len; 1426 1427 VPRINTK("six-byte command\n"); 1428 1429 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1430 lba |= ((u64)cdb[2]) << 8; 1431 lba |= ((u64)cdb[3]); 1432 1433 len = cdb[4]; 1434 1435 *plba = lba; 1436 *plen = len; 1437 } 1438 1439 /** 1440 * scsi_10_lba_len - Get LBA and transfer length 1441 * @cdb: SCSI command to translate 1442 * 1443 * Calculate LBA and transfer length for 10-byte commands. 1444 * 1445 * RETURNS: 1446 * @plba: the LBA 1447 * @plen: the transfer length 1448 */ 1449 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1450 { 1451 u64 lba = 0; 1452 u32 len = 0; 1453 1454 VPRINTK("ten-byte command\n"); 1455 1456 lba |= ((u64)cdb[2]) << 24; 1457 lba |= ((u64)cdb[3]) << 16; 1458 lba |= ((u64)cdb[4]) << 8; 1459 lba |= ((u64)cdb[5]); 1460 1461 len |= ((u32)cdb[7]) << 8; 1462 len |= ((u32)cdb[8]); 1463 1464 *plba = lba; 1465 *plen = len; 1466 } 1467 1468 /** 1469 * scsi_16_lba_len - Get LBA and transfer length 1470 * @cdb: SCSI command to translate 1471 * 1472 * Calculate LBA and transfer length for 16-byte commands. 1473 * 1474 * RETURNS: 1475 * @plba: the LBA 1476 * @plen: the transfer length 1477 */ 1478 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1479 { 1480 u64 lba = 0; 1481 u32 len = 0; 1482 1483 VPRINTK("sixteen-byte command\n"); 1484 1485 lba |= ((u64)cdb[2]) << 56; 1486 lba |= ((u64)cdb[3]) << 48; 1487 lba |= ((u64)cdb[4]) << 40; 1488 lba |= ((u64)cdb[5]) << 32; 1489 lba |= ((u64)cdb[6]) << 24; 1490 lba |= ((u64)cdb[7]) << 16; 1491 lba |= ((u64)cdb[8]) << 8; 1492 lba |= ((u64)cdb[9]); 1493 1494 len |= ((u32)cdb[10]) << 24; 1495 len |= ((u32)cdb[11]) << 16; 1496 len |= ((u32)cdb[12]) << 8; 1497 len |= ((u32)cdb[13]); 1498 1499 *plba = lba; 1500 *plen = len; 1501 } 1502 1503 /** 1504 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1505 * @qc: Storage for translated ATA taskfile 1506 * 1507 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1508 * 1509 * LOCKING: 1510 * spin_lock_irqsave(host lock) 1511 * 1512 * RETURNS: 1513 * Zero on success, non-zero on error. 1514 */ 1515 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1516 { 1517 struct scsi_cmnd *scmd = qc->scsicmd; 1518 struct ata_taskfile *tf = &qc->tf; 1519 struct ata_device *dev = qc->dev; 1520 u64 dev_sectors = qc->dev->n_sectors; 1521 const u8 *cdb = scmd->cmnd; 1522 u64 block; 1523 u32 n_block; 1524 1525 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1526 tf->protocol = ATA_PROT_NODATA; 1527 1528 if (cdb[0] == VERIFY) { 1529 if (scmd->cmd_len < 10) 1530 goto invalid_fld; 1531 scsi_10_lba_len(cdb, &block, &n_block); 1532 } else if (cdb[0] == VERIFY_16) { 1533 if (scmd->cmd_len < 16) 1534 goto invalid_fld; 1535 scsi_16_lba_len(cdb, &block, &n_block); 1536 } else 1537 goto invalid_fld; 1538 1539 if (!n_block) 1540 goto nothing_to_do; 1541 if (block >= dev_sectors) 1542 goto out_of_range; 1543 if ((block + n_block) > dev_sectors) 1544 goto out_of_range; 1545 1546 if (dev->flags & ATA_DFLAG_LBA) { 1547 tf->flags |= ATA_TFLAG_LBA; 1548 1549 if (lba_28_ok(block, n_block)) { 1550 /* use LBA28 */ 1551 tf->command = ATA_CMD_VERIFY; 1552 tf->device |= (block >> 24) & 0xf; 1553 } else if (lba_48_ok(block, n_block)) { 1554 if (!(dev->flags & ATA_DFLAG_LBA48)) 1555 goto out_of_range; 1556 1557 /* use LBA48 */ 1558 tf->flags |= ATA_TFLAG_LBA48; 1559 tf->command = ATA_CMD_VERIFY_EXT; 1560 1561 tf->hob_nsect = (n_block >> 8) & 0xff; 1562 1563 tf->hob_lbah = (block >> 40) & 0xff; 1564 tf->hob_lbam = (block >> 32) & 0xff; 1565 tf->hob_lbal = (block >> 24) & 0xff; 1566 } else 1567 /* request too large even for LBA48 */ 1568 goto out_of_range; 1569 1570 tf->nsect = n_block & 0xff; 1571 1572 tf->lbah = (block >> 16) & 0xff; 1573 tf->lbam = (block >> 8) & 0xff; 1574 tf->lbal = block & 0xff; 1575 1576 tf->device |= ATA_LBA; 1577 } else { 1578 /* CHS */ 1579 u32 sect, head, cyl, track; 1580 1581 if (!lba_28_ok(block, n_block)) 1582 goto out_of_range; 1583 1584 /* Convert LBA to CHS */ 1585 track = (u32)block / dev->sectors; 1586 cyl = track / dev->heads; 1587 head = track % dev->heads; 1588 sect = (u32)block % dev->sectors + 1; 1589 1590 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1591 (u32)block, track, cyl, head, sect); 1592 1593 /* Check whether the converted CHS can fit. 1594 Cylinder: 0-65535 1595 Head: 0-15 1596 Sector: 1-255*/ 1597 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1598 goto out_of_range; 1599 1600 tf->command = ATA_CMD_VERIFY; 1601 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1602 tf->lbal = sect; 1603 tf->lbam = cyl; 1604 tf->lbah = cyl >> 8; 1605 tf->device |= head; 1606 } 1607 1608 return 0; 1609 1610 invalid_fld: 1611 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1612 /* "Invalid field in cbd" */ 1613 return 1; 1614 1615 out_of_range: 1616 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1617 /* "Logical Block Address out of range" */ 1618 return 1; 1619 1620 nothing_to_do: 1621 scmd->result = SAM_STAT_GOOD; 1622 return 1; 1623 } 1624 1625 /** 1626 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1627 * @qc: Storage for translated ATA taskfile 1628 * 1629 * Converts any of six SCSI read/write commands into the 1630 * ATA counterpart, including starting sector (LBA), 1631 * sector count, and taking into account the device's LBA48 1632 * support. 1633 * 1634 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1635 * %WRITE_16 are currently supported. 1636 * 1637 * LOCKING: 1638 * spin_lock_irqsave(host lock) 1639 * 1640 * RETURNS: 1641 * Zero on success, non-zero on error. 1642 */ 1643 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1644 { 1645 struct scsi_cmnd *scmd = qc->scsicmd; 1646 const u8 *cdb = scmd->cmnd; 1647 unsigned int tf_flags = 0; 1648 u64 block; 1649 u32 n_block; 1650 int rc; 1651 1652 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1653 tf_flags |= ATA_TFLAG_WRITE; 1654 1655 /* Calculate the SCSI LBA, transfer length and FUA. */ 1656 switch (cdb[0]) { 1657 case READ_10: 1658 case WRITE_10: 1659 if (unlikely(scmd->cmd_len < 10)) 1660 goto invalid_fld; 1661 scsi_10_lba_len(cdb, &block, &n_block); 1662 if (cdb[1] & (1 << 3)) 1663 tf_flags |= ATA_TFLAG_FUA; 1664 break; 1665 case READ_6: 1666 case WRITE_6: 1667 if (unlikely(scmd->cmd_len < 6)) 1668 goto invalid_fld; 1669 scsi_6_lba_len(cdb, &block, &n_block); 1670 1671 /* for 6-byte r/w commands, transfer length 0 1672 * means 256 blocks of data, not 0 block. 1673 */ 1674 if (!n_block) 1675 n_block = 256; 1676 break; 1677 case READ_16: 1678 case WRITE_16: 1679 if (unlikely(scmd->cmd_len < 16)) 1680 goto invalid_fld; 1681 scsi_16_lba_len(cdb, &block, &n_block); 1682 if (cdb[1] & (1 << 3)) 1683 tf_flags |= ATA_TFLAG_FUA; 1684 break; 1685 default: 1686 DPRINTK("no-byte command\n"); 1687 goto invalid_fld; 1688 } 1689 1690 /* Check and compose ATA command */ 1691 if (!n_block) 1692 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1693 * length 0 means transfer 0 block of data. 1694 * However, for ATA R/W commands, sector count 0 means 1695 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1696 * 1697 * WARNING: one or two older ATA drives treat 0 as 0... 1698 */ 1699 goto nothing_to_do; 1700 1701 qc->flags |= ATA_QCFLAG_IO; 1702 qc->nbytes = n_block * scmd->device->sector_size; 1703 1704 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1705 qc->tag); 1706 if (likely(rc == 0)) 1707 return 0; 1708 1709 if (rc == -ERANGE) 1710 goto out_of_range; 1711 /* treat all other errors as -EINVAL, fall through */ 1712 invalid_fld: 1713 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1714 /* "Invalid field in cbd" */ 1715 return 1; 1716 1717 out_of_range: 1718 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1719 /* "Logical Block Address out of range" */ 1720 return 1; 1721 1722 nothing_to_do: 1723 scmd->result = SAM_STAT_GOOD; 1724 return 1; 1725 } 1726 1727 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1728 { 1729 struct ata_port *ap = qc->ap; 1730 struct scsi_cmnd *cmd = qc->scsicmd; 1731 u8 *cdb = cmd->cmnd; 1732 int need_sense = (qc->err_mask != 0); 1733 1734 /* For ATA pass thru (SAT) commands, generate a sense block if 1735 * user mandated it or if there's an error. Note that if we 1736 * generate because the user forced us to, a check condition 1737 * is generated and the ATA register values are returned 1738 * whether the command completed successfully or not. If there 1739 * was no error, SK, ASC and ASCQ will all be zero. 1740 */ 1741 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1742 ((cdb[2] & 0x20) || need_sense)) { 1743 ata_gen_passthru_sense(qc); 1744 } else { 1745 if (!need_sense) { 1746 cmd->result = SAM_STAT_GOOD; 1747 } else { 1748 /* TODO: decide which descriptor format to use 1749 * for 48b LBA devices and call that here 1750 * instead of the fixed desc, which is only 1751 * good for smaller LBA (and maybe CHS?) 1752 * devices. 1753 */ 1754 ata_gen_ata_sense(qc); 1755 } 1756 } 1757 1758 if (need_sense && !ap->ops->error_handler) 1759 ata_dump_status(ap->print_id, &qc->result_tf); 1760 1761 qc->scsidone(cmd); 1762 1763 ata_qc_free(qc); 1764 } 1765 1766 /** 1767 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1768 * @dev: ATA device to which the command is addressed 1769 * @cmd: SCSI command to execute 1770 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1771 * 1772 * Our ->queuecommand() function has decided that the SCSI 1773 * command issued can be directly translated into an ATA 1774 * command, rather than handled internally. 1775 * 1776 * This function sets up an ata_queued_cmd structure for the 1777 * SCSI command, and sends that ata_queued_cmd to the hardware. 1778 * 1779 * The xlat_func argument (actor) returns 0 if ready to execute 1780 * ATA command, else 1 to finish translation. If 1 is returned 1781 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1782 * to be set reflecting an error condition or clean (early) 1783 * termination. 1784 * 1785 * LOCKING: 1786 * spin_lock_irqsave(host lock) 1787 * 1788 * RETURNS: 1789 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1790 * needs to be deferred. 1791 */ 1792 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1793 ata_xlat_func_t xlat_func) 1794 { 1795 struct ata_port *ap = dev->link->ap; 1796 struct ata_queued_cmd *qc; 1797 int rc; 1798 1799 VPRINTK("ENTER\n"); 1800 1801 qc = ata_scsi_qc_new(dev, cmd); 1802 if (!qc) 1803 goto err_mem; 1804 1805 /* data is present; dma-map it */ 1806 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1807 cmd->sc_data_direction == DMA_TO_DEVICE) { 1808 if (unlikely(scsi_bufflen(cmd) < 1)) { 1809 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1810 goto err_did; 1811 } 1812 1813 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1814 1815 qc->dma_dir = cmd->sc_data_direction; 1816 } 1817 1818 qc->complete_fn = ata_scsi_qc_complete; 1819 1820 if (xlat_func(qc)) 1821 goto early_finish; 1822 1823 if (ap->ops->qc_defer) { 1824 if ((rc = ap->ops->qc_defer(qc))) 1825 goto defer; 1826 } 1827 1828 /* select device, send command to hardware */ 1829 ata_qc_issue(qc); 1830 1831 VPRINTK("EXIT\n"); 1832 return 0; 1833 1834 early_finish: 1835 ata_qc_free(qc); 1836 cmd->scsi_done(cmd); 1837 DPRINTK("EXIT - early finish (good or error)\n"); 1838 return 0; 1839 1840 err_did: 1841 ata_qc_free(qc); 1842 cmd->result = (DID_ERROR << 16); 1843 cmd->scsi_done(cmd); 1844 err_mem: 1845 DPRINTK("EXIT - internal\n"); 1846 return 0; 1847 1848 defer: 1849 ata_qc_free(qc); 1850 DPRINTK("EXIT - defer\n"); 1851 if (rc == ATA_DEFER_LINK) 1852 return SCSI_MLQUEUE_DEVICE_BUSY; 1853 else 1854 return SCSI_MLQUEUE_HOST_BUSY; 1855 } 1856 1857 /** 1858 * ata_scsi_rbuf_get - Map response buffer. 1859 * @cmd: SCSI command containing buffer to be mapped. 1860 * @flags: unsigned long variable to store irq enable status 1861 * @copy_in: copy in from user buffer 1862 * 1863 * Prepare buffer for simulated SCSI commands. 1864 * 1865 * LOCKING: 1866 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1867 * 1868 * RETURNS: 1869 * Pointer to response buffer. 1870 */ 1871 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1872 unsigned long *flags) 1873 { 1874 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1875 1876 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1877 if (copy_in) 1878 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1879 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1880 return ata_scsi_rbuf; 1881 } 1882 1883 /** 1884 * ata_scsi_rbuf_put - Unmap response buffer. 1885 * @cmd: SCSI command containing buffer to be unmapped. 1886 * @copy_out: copy out result 1887 * @flags: @flags passed to ata_scsi_rbuf_get() 1888 * 1889 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1890 * @copy_back is true. 1891 * 1892 * LOCKING: 1893 * Unlocks ata_scsi_rbuf_lock. 1894 */ 1895 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1896 unsigned long *flags) 1897 { 1898 if (copy_out) 1899 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1900 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1901 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1902 } 1903 1904 /** 1905 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1906 * @args: device IDENTIFY data / SCSI command of interest. 1907 * @actor: Callback hook for desired SCSI command simulator 1908 * 1909 * Takes care of the hard work of simulating a SCSI command... 1910 * Mapping the response buffer, calling the command's handler, 1911 * and handling the handler's return value. This return value 1912 * indicates whether the handler wishes the SCSI command to be 1913 * completed successfully (0), or not (in which case cmd->result 1914 * and sense buffer are assumed to be set). 1915 * 1916 * LOCKING: 1917 * spin_lock_irqsave(host lock) 1918 */ 1919 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1920 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1921 { 1922 u8 *rbuf; 1923 unsigned int rc; 1924 struct scsi_cmnd *cmd = args->cmd; 1925 unsigned long flags; 1926 1927 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1928 rc = actor(args, rbuf); 1929 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1930 1931 if (rc == 0) 1932 cmd->result = SAM_STAT_GOOD; 1933 args->done(cmd); 1934 } 1935 1936 /** 1937 * ata_scsiop_inq_std - Simulate INQUIRY command 1938 * @args: device IDENTIFY data / SCSI command of interest. 1939 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1940 * 1941 * Returns standard device identification data associated 1942 * with non-VPD INQUIRY command output. 1943 * 1944 * LOCKING: 1945 * spin_lock_irqsave(host lock) 1946 */ 1947 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1948 { 1949 const u8 versions[] = { 1950 0x60, /* SAM-3 (no version claimed) */ 1951 1952 0x03, 1953 0x20, /* SBC-2 (no version claimed) */ 1954 1955 0x02, 1956 0x60 /* SPC-3 (no version claimed) */ 1957 }; 1958 u8 hdr[] = { 1959 TYPE_DISK, 1960 0, 1961 0x5, /* claim SPC-3 version compatibility */ 1962 2, 1963 95 - 4 1964 }; 1965 1966 VPRINTK("ENTER\n"); 1967 1968 /* set scsi removeable (RMB) bit per ata bit */ 1969 if (ata_id_removeable(args->id)) 1970 hdr[1] |= (1 << 7); 1971 1972 memcpy(rbuf, hdr, sizeof(hdr)); 1973 memcpy(&rbuf[8], "ATA ", 8); 1974 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1975 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1976 1977 if (rbuf[32] == 0 || rbuf[32] == ' ') 1978 memcpy(&rbuf[32], "n/a ", 4); 1979 1980 memcpy(rbuf + 59, versions, sizeof(versions)); 1981 1982 return 0; 1983 } 1984 1985 /** 1986 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1987 * @args: device IDENTIFY data / SCSI command of interest. 1988 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1989 * 1990 * Returns list of inquiry VPD pages available. 1991 * 1992 * LOCKING: 1993 * spin_lock_irqsave(host lock) 1994 */ 1995 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1996 { 1997 const u8 pages[] = { 1998 0x00, /* page 0x00, this page */ 1999 0x80, /* page 0x80, unit serial no page */ 2000 0x83, /* page 0x83, device ident page */ 2001 0x89, /* page 0x89, ata info page */ 2002 0xb0, /* page 0xb0, block limits page */ 2003 0xb1, /* page 0xb1, block device characteristics page */ 2004 0xb2, /* page 0xb2, thin provisioning page */ 2005 }; 2006 2007 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2008 memcpy(rbuf + 4, pages, sizeof(pages)); 2009 return 0; 2010 } 2011 2012 /** 2013 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2014 * @args: device IDENTIFY data / SCSI command of interest. 2015 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2016 * 2017 * Returns ATA device serial number. 2018 * 2019 * LOCKING: 2020 * spin_lock_irqsave(host lock) 2021 */ 2022 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2023 { 2024 const u8 hdr[] = { 2025 0, 2026 0x80, /* this page code */ 2027 0, 2028 ATA_ID_SERNO_LEN, /* page len */ 2029 }; 2030 2031 memcpy(rbuf, hdr, sizeof(hdr)); 2032 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2033 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2034 return 0; 2035 } 2036 2037 /** 2038 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2039 * @args: device IDENTIFY data / SCSI command of interest. 2040 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2041 * 2042 * Yields two logical unit device identification designators: 2043 * - vendor specific ASCII containing the ATA serial number 2044 * - SAT defined "t10 vendor id based" containing ASCII vendor 2045 * name ("ATA "), model and serial numbers. 2046 * 2047 * LOCKING: 2048 * spin_lock_irqsave(host lock) 2049 */ 2050 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2051 { 2052 const int sat_model_serial_desc_len = 68; 2053 int num; 2054 2055 rbuf[1] = 0x83; /* this page code */ 2056 num = 4; 2057 2058 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2059 rbuf[num + 0] = 2; 2060 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2061 num += 4; 2062 ata_id_string(args->id, (unsigned char *) rbuf + num, 2063 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2064 num += ATA_ID_SERNO_LEN; 2065 2066 /* SAT defined lu model and serial numbers descriptor */ 2067 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2068 rbuf[num + 0] = 2; 2069 rbuf[num + 1] = 1; 2070 rbuf[num + 3] = sat_model_serial_desc_len; 2071 num += 4; 2072 memcpy(rbuf + num, "ATA ", 8); 2073 num += 8; 2074 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2075 ATA_ID_PROD_LEN); 2076 num += ATA_ID_PROD_LEN; 2077 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2078 ATA_ID_SERNO_LEN); 2079 num += ATA_ID_SERNO_LEN; 2080 2081 if (ata_id_has_wwn(args->id)) { 2082 /* SAT defined lu world wide name */ 2083 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2084 rbuf[num + 0] = 1; 2085 rbuf[num + 1] = 3; 2086 rbuf[num + 3] = ATA_ID_WWN_LEN; 2087 num += 4; 2088 ata_id_string(args->id, (unsigned char *) rbuf + num, 2089 ATA_ID_WWN, ATA_ID_WWN_LEN); 2090 num += ATA_ID_WWN_LEN; 2091 } 2092 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2093 return 0; 2094 } 2095 2096 /** 2097 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2098 * @args: device IDENTIFY data / SCSI command of interest. 2099 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2100 * 2101 * Yields SAT-specified ATA VPD page. 2102 * 2103 * LOCKING: 2104 * spin_lock_irqsave(host lock) 2105 */ 2106 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2107 { 2108 struct ata_taskfile tf; 2109 2110 memset(&tf, 0, sizeof(tf)); 2111 2112 rbuf[1] = 0x89; /* our page code */ 2113 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2114 rbuf[3] = (0x238 & 0xff); 2115 2116 memcpy(&rbuf[8], "linux ", 8); 2117 memcpy(&rbuf[16], "libata ", 16); 2118 memcpy(&rbuf[32], DRV_VERSION, 4); 2119 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2120 2121 /* we don't store the ATA device signature, so we fake it */ 2122 2123 tf.command = ATA_DRDY; /* really, this is Status reg */ 2124 tf.lbal = 0x1; 2125 tf.nsect = 0x1; 2126 2127 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2128 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2129 2130 rbuf[56] = ATA_CMD_ID_ATA; 2131 2132 memcpy(&rbuf[60], &args->id[0], 512); 2133 return 0; 2134 } 2135 2136 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2137 { 2138 u16 min_io_sectors; 2139 2140 rbuf[1] = 0xb0; 2141 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2142 2143 /* 2144 * Optimal transfer length granularity. 2145 * 2146 * This is always one physical block, but for disks with a smaller 2147 * logical than physical sector size we need to figure out what the 2148 * latter is. 2149 */ 2150 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2151 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2152 2153 /* 2154 * Optimal unmap granularity. 2155 * 2156 * The ATA spec doesn't even know about a granularity or alignment 2157 * for the TRIM command. We can leave away most of the unmap related 2158 * VPD page entries, but we have specifify a granularity to signal 2159 * that we support some form of unmap - in thise case via WRITE SAME 2160 * with the unmap bit set. 2161 */ 2162 if (ata_id_has_trim(args->id)) { 2163 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2164 put_unaligned_be32(1, &rbuf[28]); 2165 } 2166 2167 return 0; 2168 } 2169 2170 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2171 { 2172 int form_factor = ata_id_form_factor(args->id); 2173 int media_rotation_rate = ata_id_rotation_rate(args->id); 2174 2175 rbuf[1] = 0xb1; 2176 rbuf[3] = 0x3c; 2177 rbuf[4] = media_rotation_rate >> 8; 2178 rbuf[5] = media_rotation_rate; 2179 rbuf[7] = form_factor; 2180 2181 return 0; 2182 } 2183 2184 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2185 { 2186 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2187 rbuf[1] = 0xb2; 2188 rbuf[3] = 0x4; 2189 rbuf[5] = 1 << 6; /* TPWS */ 2190 2191 return 0; 2192 } 2193 2194 /** 2195 * ata_scsiop_noop - Command handler that simply returns success. 2196 * @args: device IDENTIFY data / SCSI command of interest. 2197 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2198 * 2199 * No operation. Simply returns success to caller, to indicate 2200 * that the caller should successfully complete this SCSI command. 2201 * 2202 * LOCKING: 2203 * spin_lock_irqsave(host lock) 2204 */ 2205 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2206 { 2207 VPRINTK("ENTER\n"); 2208 return 0; 2209 } 2210 2211 /** 2212 * modecpy - Prepare response for MODE SENSE 2213 * @dest: output buffer 2214 * @src: data being copied 2215 * @n: length of mode page 2216 * @changeable: whether changeable parameters are requested 2217 * 2218 * Generate a generic MODE SENSE page for either current or changeable 2219 * parameters. 2220 * 2221 * LOCKING: 2222 * None. 2223 */ 2224 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2225 { 2226 if (changeable) { 2227 memcpy(dest, src, 2); 2228 memset(dest + 2, 0, n - 2); 2229 } else { 2230 memcpy(dest, src, n); 2231 } 2232 } 2233 2234 /** 2235 * ata_msense_caching - Simulate MODE SENSE caching info page 2236 * @id: device IDENTIFY data 2237 * @buf: output buffer 2238 * @changeable: whether changeable parameters are requested 2239 * 2240 * Generate a caching info page, which conditionally indicates 2241 * write caching to the SCSI layer, depending on device 2242 * capabilities. 2243 * 2244 * LOCKING: 2245 * None. 2246 */ 2247 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2248 { 2249 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2250 if (changeable || ata_id_wcache_enabled(id)) 2251 buf[2] |= (1 << 2); /* write cache enable */ 2252 if (!changeable && !ata_id_rahead_enabled(id)) 2253 buf[12] |= (1 << 5); /* disable read ahead */ 2254 return sizeof(def_cache_mpage); 2255 } 2256 2257 /** 2258 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2259 * @buf: output buffer 2260 * @changeable: whether changeable parameters are requested 2261 * 2262 * Generate a generic MODE SENSE control mode page. 2263 * 2264 * LOCKING: 2265 * None. 2266 */ 2267 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2268 { 2269 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2270 return sizeof(def_control_mpage); 2271 } 2272 2273 /** 2274 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2275 * @buf: output buffer 2276 * @changeable: whether changeable parameters are requested 2277 * 2278 * Generate a generic MODE SENSE r/w error recovery page. 2279 * 2280 * LOCKING: 2281 * None. 2282 */ 2283 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2284 { 2285 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2286 changeable); 2287 return sizeof(def_rw_recovery_mpage); 2288 } 2289 2290 /* 2291 * We can turn this into a real blacklist if it's needed, for now just 2292 * blacklist any Maxtor BANC1G10 revision firmware 2293 */ 2294 static int ata_dev_supports_fua(u16 *id) 2295 { 2296 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2297 2298 if (!libata_fua) 2299 return 0; 2300 if (!ata_id_has_fua(id)) 2301 return 0; 2302 2303 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2304 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2305 2306 if (strcmp(model, "Maxtor")) 2307 return 1; 2308 if (strcmp(fw, "BANC1G10")) 2309 return 1; 2310 2311 return 0; /* blacklisted */ 2312 } 2313 2314 /** 2315 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2316 * @args: device IDENTIFY data / SCSI command of interest. 2317 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2318 * 2319 * Simulate MODE SENSE commands. Assume this is invoked for direct 2320 * access devices (e.g. disks) only. There should be no block 2321 * descriptor for other device types. 2322 * 2323 * LOCKING: 2324 * spin_lock_irqsave(host lock) 2325 */ 2326 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2327 { 2328 struct ata_device *dev = args->dev; 2329 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2330 const u8 sat_blk_desc[] = { 2331 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2332 0, 2333 0, 0x2, 0x0 /* block length: 512 bytes */ 2334 }; 2335 u8 pg, spg; 2336 unsigned int ebd, page_control, six_byte; 2337 u8 dpofua; 2338 2339 VPRINTK("ENTER\n"); 2340 2341 six_byte = (scsicmd[0] == MODE_SENSE); 2342 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2343 /* 2344 * LLBA bit in msense(10) ignored (compliant) 2345 */ 2346 2347 page_control = scsicmd[2] >> 6; 2348 switch (page_control) { 2349 case 0: /* current */ 2350 case 1: /* changeable */ 2351 case 2: /* defaults */ 2352 break; /* supported */ 2353 case 3: /* saved */ 2354 goto saving_not_supp; 2355 default: 2356 goto invalid_fld; 2357 } 2358 2359 if (six_byte) 2360 p += 4 + (ebd ? 8 : 0); 2361 else 2362 p += 8 + (ebd ? 8 : 0); 2363 2364 pg = scsicmd[2] & 0x3f; 2365 spg = scsicmd[3]; 2366 /* 2367 * No mode subpages supported (yet) but asking for _all_ 2368 * subpages may be valid 2369 */ 2370 if (spg && (spg != ALL_SUB_MPAGES)) 2371 goto invalid_fld; 2372 2373 switch(pg) { 2374 case RW_RECOVERY_MPAGE: 2375 p += ata_msense_rw_recovery(p, page_control == 1); 2376 break; 2377 2378 case CACHE_MPAGE: 2379 p += ata_msense_caching(args->id, p, page_control == 1); 2380 break; 2381 2382 case CONTROL_MPAGE: 2383 p += ata_msense_ctl_mode(p, page_control == 1); 2384 break; 2385 2386 case ALL_MPAGES: 2387 p += ata_msense_rw_recovery(p, page_control == 1); 2388 p += ata_msense_caching(args->id, p, page_control == 1); 2389 p += ata_msense_ctl_mode(p, page_control == 1); 2390 break; 2391 2392 default: /* invalid page code */ 2393 goto invalid_fld; 2394 } 2395 2396 dpofua = 0; 2397 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2398 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2399 dpofua = 1 << 4; 2400 2401 if (six_byte) { 2402 rbuf[0] = p - rbuf - 1; 2403 rbuf[2] |= dpofua; 2404 if (ebd) { 2405 rbuf[3] = sizeof(sat_blk_desc); 2406 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2407 } 2408 } else { 2409 unsigned int output_len = p - rbuf - 2; 2410 2411 rbuf[0] = output_len >> 8; 2412 rbuf[1] = output_len; 2413 rbuf[3] |= dpofua; 2414 if (ebd) { 2415 rbuf[7] = sizeof(sat_blk_desc); 2416 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2417 } 2418 } 2419 return 0; 2420 2421 invalid_fld: 2422 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2423 /* "Invalid field in cbd" */ 2424 return 1; 2425 2426 saving_not_supp: 2427 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2428 /* "Saving parameters not supported" */ 2429 return 1; 2430 } 2431 2432 /** 2433 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2434 * @args: device IDENTIFY data / SCSI command of interest. 2435 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2436 * 2437 * Simulate READ CAPACITY commands. 2438 * 2439 * LOCKING: 2440 * None. 2441 */ 2442 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2443 { 2444 struct ata_device *dev = args->dev; 2445 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2446 u32 sector_size; /* physical sector size in bytes */ 2447 u8 log2_per_phys; 2448 u16 lowest_aligned; 2449 2450 sector_size = ata_id_logical_sector_size(dev->id); 2451 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2452 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2453 2454 VPRINTK("ENTER\n"); 2455 2456 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2457 if (last_lba >= 0xffffffffULL) 2458 last_lba = 0xffffffff; 2459 2460 /* sector count, 32-bit */ 2461 rbuf[0] = last_lba >> (8 * 3); 2462 rbuf[1] = last_lba >> (8 * 2); 2463 rbuf[2] = last_lba >> (8 * 1); 2464 rbuf[3] = last_lba; 2465 2466 /* sector size */ 2467 rbuf[4] = sector_size >> (8 * 3); 2468 rbuf[5] = sector_size >> (8 * 2); 2469 rbuf[6] = sector_size >> (8 * 1); 2470 rbuf[7] = sector_size; 2471 } else { 2472 /* sector count, 64-bit */ 2473 rbuf[0] = last_lba >> (8 * 7); 2474 rbuf[1] = last_lba >> (8 * 6); 2475 rbuf[2] = last_lba >> (8 * 5); 2476 rbuf[3] = last_lba >> (8 * 4); 2477 rbuf[4] = last_lba >> (8 * 3); 2478 rbuf[5] = last_lba >> (8 * 2); 2479 rbuf[6] = last_lba >> (8 * 1); 2480 rbuf[7] = last_lba; 2481 2482 /* sector size */ 2483 rbuf[ 8] = sector_size >> (8 * 3); 2484 rbuf[ 9] = sector_size >> (8 * 2); 2485 rbuf[10] = sector_size >> (8 * 1); 2486 rbuf[11] = sector_size; 2487 2488 rbuf[12] = 0; 2489 rbuf[13] = log2_per_phys; 2490 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2491 rbuf[15] = lowest_aligned; 2492 2493 if (ata_id_has_trim(args->id)) { 2494 rbuf[14] |= 0x80; /* TPE */ 2495 2496 if (ata_id_has_zero_after_trim(args->id)) 2497 rbuf[14] |= 0x40; /* TPRZ */ 2498 } 2499 } 2500 2501 return 0; 2502 } 2503 2504 /** 2505 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2506 * @args: device IDENTIFY data / SCSI command of interest. 2507 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2508 * 2509 * Simulate REPORT LUNS command. 2510 * 2511 * LOCKING: 2512 * spin_lock_irqsave(host lock) 2513 */ 2514 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2515 { 2516 VPRINTK("ENTER\n"); 2517 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2518 2519 return 0; 2520 } 2521 2522 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2523 { 2524 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2525 /* FIXME: not quite right; we don't want the 2526 * translation of taskfile registers into 2527 * a sense descriptors, since that's only 2528 * correct for ATA, not ATAPI 2529 */ 2530 ata_gen_passthru_sense(qc); 2531 } 2532 2533 qc->scsidone(qc->scsicmd); 2534 ata_qc_free(qc); 2535 } 2536 2537 /* is it pointless to prefer PIO for "safety reasons"? */ 2538 static inline int ata_pio_use_silly(struct ata_port *ap) 2539 { 2540 return (ap->flags & ATA_FLAG_PIO_DMA); 2541 } 2542 2543 static void atapi_request_sense(struct ata_queued_cmd *qc) 2544 { 2545 struct ata_port *ap = qc->ap; 2546 struct scsi_cmnd *cmd = qc->scsicmd; 2547 2548 DPRINTK("ATAPI request sense\n"); 2549 2550 /* FIXME: is this needed? */ 2551 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2552 2553 #ifdef CONFIG_ATA_SFF 2554 if (ap->ops->sff_tf_read) 2555 ap->ops->sff_tf_read(ap, &qc->tf); 2556 #endif 2557 2558 /* fill these in, for the case where they are -not- overwritten */ 2559 cmd->sense_buffer[0] = 0x70; 2560 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2561 2562 ata_qc_reinit(qc); 2563 2564 /* setup sg table and init transfer direction */ 2565 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2566 ata_sg_init(qc, &qc->sgent, 1); 2567 qc->dma_dir = DMA_FROM_DEVICE; 2568 2569 memset(&qc->cdb, 0, qc->dev->cdb_len); 2570 qc->cdb[0] = REQUEST_SENSE; 2571 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2572 2573 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2574 qc->tf.command = ATA_CMD_PACKET; 2575 2576 if (ata_pio_use_silly(ap)) { 2577 qc->tf.protocol = ATAPI_PROT_DMA; 2578 qc->tf.feature |= ATAPI_PKT_DMA; 2579 } else { 2580 qc->tf.protocol = ATAPI_PROT_PIO; 2581 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2582 qc->tf.lbah = 0; 2583 } 2584 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2585 2586 qc->complete_fn = atapi_sense_complete; 2587 2588 ata_qc_issue(qc); 2589 2590 DPRINTK("EXIT\n"); 2591 } 2592 2593 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2594 { 2595 struct scsi_cmnd *cmd = qc->scsicmd; 2596 unsigned int err_mask = qc->err_mask; 2597 2598 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2599 2600 /* handle completion from new EH */ 2601 if (unlikely(qc->ap->ops->error_handler && 2602 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2603 2604 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2605 /* FIXME: not quite right; we don't want the 2606 * translation of taskfile registers into a 2607 * sense descriptors, since that's only 2608 * correct for ATA, not ATAPI 2609 */ 2610 ata_gen_passthru_sense(qc); 2611 } 2612 2613 /* SCSI EH automatically locks door if sdev->locked is 2614 * set. Sometimes door lock request continues to 2615 * fail, for example, when no media is present. This 2616 * creates a loop - SCSI EH issues door lock which 2617 * fails and gets invoked again to acquire sense data 2618 * for the failed command. 2619 * 2620 * If door lock fails, always clear sdev->locked to 2621 * avoid this infinite loop. 2622 * 2623 * This may happen before SCSI scan is complete. Make 2624 * sure qc->dev->sdev isn't NULL before dereferencing. 2625 */ 2626 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2627 qc->dev->sdev->locked = 0; 2628 2629 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2630 qc->scsidone(cmd); 2631 ata_qc_free(qc); 2632 return; 2633 } 2634 2635 /* successful completion or old EH failure path */ 2636 if (unlikely(err_mask & AC_ERR_DEV)) { 2637 cmd->result = SAM_STAT_CHECK_CONDITION; 2638 atapi_request_sense(qc); 2639 return; 2640 } else if (unlikely(err_mask)) { 2641 /* FIXME: not quite right; we don't want the 2642 * translation of taskfile registers into 2643 * a sense descriptors, since that's only 2644 * correct for ATA, not ATAPI 2645 */ 2646 ata_gen_passthru_sense(qc); 2647 } else { 2648 u8 *scsicmd = cmd->cmnd; 2649 2650 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2651 unsigned long flags; 2652 u8 *buf; 2653 2654 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2655 2656 /* ATAPI devices typically report zero for their SCSI version, 2657 * and sometimes deviate from the spec WRT response data 2658 * format. If SCSI version is reported as zero like normal, 2659 * then we make the following fixups: 1) Fake MMC-5 version, 2660 * to indicate to the Linux scsi midlayer this is a modern 2661 * device. 2) Ensure response data format / ATAPI information 2662 * are always correct. 2663 */ 2664 if (buf[2] == 0) { 2665 buf[2] = 0x5; 2666 buf[3] = 0x32; 2667 } 2668 2669 ata_scsi_rbuf_put(cmd, true, &flags); 2670 } 2671 2672 cmd->result = SAM_STAT_GOOD; 2673 } 2674 2675 qc->scsidone(cmd); 2676 ata_qc_free(qc); 2677 } 2678 /** 2679 * atapi_xlat - Initialize PACKET taskfile 2680 * @qc: command structure to be initialized 2681 * 2682 * LOCKING: 2683 * spin_lock_irqsave(host lock) 2684 * 2685 * RETURNS: 2686 * Zero on success, non-zero on failure. 2687 */ 2688 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2689 { 2690 struct scsi_cmnd *scmd = qc->scsicmd; 2691 struct ata_device *dev = qc->dev; 2692 int nodata = (scmd->sc_data_direction == DMA_NONE); 2693 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2694 unsigned int nbytes; 2695 2696 memset(qc->cdb, 0, dev->cdb_len); 2697 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2698 2699 qc->complete_fn = atapi_qc_complete; 2700 2701 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2702 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2703 qc->tf.flags |= ATA_TFLAG_WRITE; 2704 DPRINTK("direction: write\n"); 2705 } 2706 2707 qc->tf.command = ATA_CMD_PACKET; 2708 ata_qc_set_pc_nbytes(qc); 2709 2710 /* check whether ATAPI DMA is safe */ 2711 if (!nodata && !using_pio && atapi_check_dma(qc)) 2712 using_pio = 1; 2713 2714 /* Some controller variants snoop this value for Packet 2715 * transfers to do state machine and FIFO management. Thus we 2716 * want to set it properly, and for DMA where it is 2717 * effectively meaningless. 2718 */ 2719 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2720 2721 /* Most ATAPI devices which honor transfer chunk size don't 2722 * behave according to the spec when odd chunk size which 2723 * matches the transfer length is specified. If the number of 2724 * bytes to transfer is 2n+1. According to the spec, what 2725 * should happen is to indicate that 2n+1 is going to be 2726 * transferred and transfer 2n+2 bytes where the last byte is 2727 * padding. 2728 * 2729 * In practice, this doesn't happen. ATAPI devices first 2730 * indicate and transfer 2n bytes and then indicate and 2731 * transfer 2 bytes where the last byte is padding. 2732 * 2733 * This inconsistency confuses several controllers which 2734 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2735 * These controllers use actual number of transferred bytes to 2736 * update DMA poitner and transfer of 4n+2 bytes make those 2737 * controller push DMA pointer by 4n+4 bytes because SATA data 2738 * FISes are aligned to 4 bytes. This causes data corruption 2739 * and buffer overrun. 2740 * 2741 * Always setting nbytes to even number solves this problem 2742 * because then ATAPI devices don't have to split data at 2n 2743 * boundaries. 2744 */ 2745 if (nbytes & 0x1) 2746 nbytes++; 2747 2748 qc->tf.lbam = (nbytes & 0xFF); 2749 qc->tf.lbah = (nbytes >> 8); 2750 2751 if (nodata) 2752 qc->tf.protocol = ATAPI_PROT_NODATA; 2753 else if (using_pio) 2754 qc->tf.protocol = ATAPI_PROT_PIO; 2755 else { 2756 /* DMA data xfer */ 2757 qc->tf.protocol = ATAPI_PROT_DMA; 2758 qc->tf.feature |= ATAPI_PKT_DMA; 2759 2760 if ((dev->flags & ATA_DFLAG_DMADIR) && 2761 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2762 /* some SATA bridges need us to indicate data xfer direction */ 2763 qc->tf.feature |= ATAPI_DMADIR; 2764 } 2765 2766 2767 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2768 as ATAPI tape drives don't get this right otherwise */ 2769 return 0; 2770 } 2771 2772 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2773 { 2774 if (!sata_pmp_attached(ap)) { 2775 if (likely(devno < ata_link_max_devices(&ap->link))) 2776 return &ap->link.device[devno]; 2777 } else { 2778 if (likely(devno < ap->nr_pmp_links)) 2779 return &ap->pmp_link[devno].device[0]; 2780 } 2781 2782 return NULL; 2783 } 2784 2785 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2786 const struct scsi_device *scsidev) 2787 { 2788 int devno; 2789 2790 /* skip commands not addressed to targets we simulate */ 2791 if (!sata_pmp_attached(ap)) { 2792 if (unlikely(scsidev->channel || scsidev->lun)) 2793 return NULL; 2794 devno = scsidev->id; 2795 } else { 2796 if (unlikely(scsidev->id || scsidev->lun)) 2797 return NULL; 2798 devno = scsidev->channel; 2799 } 2800 2801 return ata_find_dev(ap, devno); 2802 } 2803 2804 /** 2805 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2806 * @ap: ATA port to which the device is attached 2807 * @scsidev: SCSI device from which we derive the ATA device 2808 * 2809 * Given various information provided in struct scsi_cmnd, 2810 * map that onto an ATA bus, and using that mapping 2811 * determine which ata_device is associated with the 2812 * SCSI command to be sent. 2813 * 2814 * LOCKING: 2815 * spin_lock_irqsave(host lock) 2816 * 2817 * RETURNS: 2818 * Associated ATA device, or %NULL if not found. 2819 */ 2820 static struct ata_device * 2821 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2822 { 2823 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2824 2825 if (unlikely(!dev || !ata_dev_enabled(dev))) 2826 return NULL; 2827 2828 return dev; 2829 } 2830 2831 /* 2832 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2833 * @byte1: Byte 1 from pass-thru CDB. 2834 * 2835 * RETURNS: 2836 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2837 */ 2838 static u8 2839 ata_scsi_map_proto(u8 byte1) 2840 { 2841 switch((byte1 & 0x1e) >> 1) { 2842 case 3: /* Non-data */ 2843 return ATA_PROT_NODATA; 2844 2845 case 6: /* DMA */ 2846 case 10: /* UDMA Data-in */ 2847 case 11: /* UDMA Data-Out */ 2848 return ATA_PROT_DMA; 2849 2850 case 4: /* PIO Data-in */ 2851 case 5: /* PIO Data-out */ 2852 return ATA_PROT_PIO; 2853 2854 case 0: /* Hard Reset */ 2855 case 1: /* SRST */ 2856 case 8: /* Device Diagnostic */ 2857 case 9: /* Device Reset */ 2858 case 7: /* DMA Queued */ 2859 case 12: /* FPDMA */ 2860 case 15: /* Return Response Info */ 2861 default: /* Reserved */ 2862 break; 2863 } 2864 2865 return ATA_PROT_UNKNOWN; 2866 } 2867 2868 /** 2869 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2870 * @qc: command structure to be initialized 2871 * 2872 * Handles either 12 or 16-byte versions of the CDB. 2873 * 2874 * RETURNS: 2875 * Zero on success, non-zero on failure. 2876 */ 2877 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2878 { 2879 struct ata_taskfile *tf = &(qc->tf); 2880 struct scsi_cmnd *scmd = qc->scsicmd; 2881 struct ata_device *dev = qc->dev; 2882 const u8 *cdb = scmd->cmnd; 2883 2884 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2885 goto invalid_fld; 2886 2887 /* 2888 * 12 and 16 byte CDBs use different offsets to 2889 * provide the various register values. 2890 */ 2891 if (cdb[0] == ATA_16) { 2892 /* 2893 * 16-byte CDB - may contain extended commands. 2894 * 2895 * If that is the case, copy the upper byte register values. 2896 */ 2897 if (cdb[1] & 0x01) { 2898 tf->hob_feature = cdb[3]; 2899 tf->hob_nsect = cdb[5]; 2900 tf->hob_lbal = cdb[7]; 2901 tf->hob_lbam = cdb[9]; 2902 tf->hob_lbah = cdb[11]; 2903 tf->flags |= ATA_TFLAG_LBA48; 2904 } else 2905 tf->flags &= ~ATA_TFLAG_LBA48; 2906 2907 /* 2908 * Always copy low byte, device and command registers. 2909 */ 2910 tf->feature = cdb[4]; 2911 tf->nsect = cdb[6]; 2912 tf->lbal = cdb[8]; 2913 tf->lbam = cdb[10]; 2914 tf->lbah = cdb[12]; 2915 tf->device = cdb[13]; 2916 tf->command = cdb[14]; 2917 } else { 2918 /* 2919 * 12-byte CDB - incapable of extended commands. 2920 */ 2921 tf->flags &= ~ATA_TFLAG_LBA48; 2922 2923 tf->feature = cdb[3]; 2924 tf->nsect = cdb[4]; 2925 tf->lbal = cdb[5]; 2926 tf->lbam = cdb[6]; 2927 tf->lbah = cdb[7]; 2928 tf->device = cdb[8]; 2929 tf->command = cdb[9]; 2930 } 2931 2932 /* enforce correct master/slave bit */ 2933 tf->device = dev->devno ? 2934 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2935 2936 switch (tf->command) { 2937 /* READ/WRITE LONG use a non-standard sect_size */ 2938 case ATA_CMD_READ_LONG: 2939 case ATA_CMD_READ_LONG_ONCE: 2940 case ATA_CMD_WRITE_LONG: 2941 case ATA_CMD_WRITE_LONG_ONCE: 2942 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2943 goto invalid_fld; 2944 qc->sect_size = scsi_bufflen(scmd); 2945 break; 2946 2947 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2948 case ATA_CMD_CFA_WRITE_NE: 2949 case ATA_CMD_CFA_TRANS_SECT: 2950 case ATA_CMD_CFA_WRITE_MULT_NE: 2951 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2952 case ATA_CMD_READ: 2953 case ATA_CMD_READ_EXT: 2954 case ATA_CMD_READ_QUEUED: 2955 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2956 case ATA_CMD_FPDMA_READ: 2957 case ATA_CMD_READ_MULTI: 2958 case ATA_CMD_READ_MULTI_EXT: 2959 case ATA_CMD_PIO_READ: 2960 case ATA_CMD_PIO_READ_EXT: 2961 case ATA_CMD_READ_STREAM_DMA_EXT: 2962 case ATA_CMD_READ_STREAM_EXT: 2963 case ATA_CMD_VERIFY: 2964 case ATA_CMD_VERIFY_EXT: 2965 case ATA_CMD_WRITE: 2966 case ATA_CMD_WRITE_EXT: 2967 case ATA_CMD_WRITE_FUA_EXT: 2968 case ATA_CMD_WRITE_QUEUED: 2969 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2970 case ATA_CMD_FPDMA_WRITE: 2971 case ATA_CMD_WRITE_MULTI: 2972 case ATA_CMD_WRITE_MULTI_EXT: 2973 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2974 case ATA_CMD_PIO_WRITE: 2975 case ATA_CMD_PIO_WRITE_EXT: 2976 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2977 case ATA_CMD_WRITE_STREAM_EXT: 2978 qc->sect_size = scmd->device->sector_size; 2979 break; 2980 2981 /* Everything else uses 512 byte "sectors" */ 2982 default: 2983 qc->sect_size = ATA_SECT_SIZE; 2984 } 2985 2986 /* 2987 * Set flags so that all registers will be written, pass on 2988 * write indication (used for PIO/DMA setup), result TF is 2989 * copied back and we don't whine too much about its failure. 2990 */ 2991 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2992 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2993 tf->flags |= ATA_TFLAG_WRITE; 2994 2995 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2996 2997 /* 2998 * Set transfer length. 2999 * 3000 * TODO: find out if we need to do more here to 3001 * cover scatter/gather case. 3002 */ 3003 ata_qc_set_pc_nbytes(qc); 3004 3005 /* We may not issue DMA commands if no DMA mode is set */ 3006 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3007 goto invalid_fld; 3008 3009 /* sanity check for pio multi commands */ 3010 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3011 goto invalid_fld; 3012 3013 if (is_multi_taskfile(tf)) { 3014 unsigned int multi_count = 1 << (cdb[1] >> 5); 3015 3016 /* compare the passed through multi_count 3017 * with the cached multi_count of libata 3018 */ 3019 if (multi_count != dev->multi_count) 3020 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3021 multi_count); 3022 } 3023 3024 /* 3025 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3026 * SET_FEATURES - XFER MODE must be preceded/succeeded 3027 * by an update to hardware-specific registers for each 3028 * controller (i.e. the reason for ->set_piomode(), 3029 * ->set_dmamode(), and ->post_set_mode() hooks). 3030 */ 3031 if (tf->command == ATA_CMD_SET_FEATURES && 3032 tf->feature == SETFEATURES_XFER) 3033 goto invalid_fld; 3034 3035 /* 3036 * Filter TPM commands by default. These provide an 3037 * essentially uncontrolled encrypted "back door" between 3038 * applications and the disk. Set libata.allow_tpm=1 if you 3039 * have a real reason for wanting to use them. This ensures 3040 * that installed software cannot easily mess stuff up without 3041 * user intent. DVR type users will probably ship with this enabled 3042 * for movie content management. 3043 * 3044 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3045 * for this and should do in future but that it is not sufficient as 3046 * DCS is an optional feature set. Thus we also do the software filter 3047 * so that we comply with the TC consortium stated goal that the user 3048 * can turn off TC features of their system. 3049 */ 3050 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3051 goto invalid_fld; 3052 3053 return 0; 3054 3055 invalid_fld: 3056 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3057 /* "Invalid field in cdb" */ 3058 return 1; 3059 } 3060 3061 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3062 { 3063 struct ata_taskfile *tf = &qc->tf; 3064 struct scsi_cmnd *scmd = qc->scsicmd; 3065 struct ata_device *dev = qc->dev; 3066 const u8 *cdb = scmd->cmnd; 3067 u64 block; 3068 u32 n_block; 3069 u32 size; 3070 void *buf; 3071 3072 /* we may not issue DMA commands if no DMA mode is set */ 3073 if (unlikely(!dev->dma_mode)) 3074 goto invalid_fld; 3075 3076 if (unlikely(scmd->cmd_len < 16)) 3077 goto invalid_fld; 3078 scsi_16_lba_len(cdb, &block, &n_block); 3079 3080 /* for now we only support WRITE SAME with the unmap bit set */ 3081 if (unlikely(!(cdb[1] & 0x8))) 3082 goto invalid_fld; 3083 3084 /* 3085 * WRITE SAME always has a sector sized buffer as payload, this 3086 * should never be a multiple entry S/G list. 3087 */ 3088 if (!scsi_sg_count(scmd)) 3089 goto invalid_fld; 3090 3091 buf = page_address(sg_page(scsi_sglist(scmd))); 3092 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3093 3094 tf->protocol = ATA_PROT_DMA; 3095 tf->hob_feature = 0; 3096 tf->feature = ATA_DSM_TRIM; 3097 tf->hob_nsect = (size / 512) >> 8; 3098 tf->nsect = size / 512; 3099 tf->command = ATA_CMD_DSM; 3100 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3101 ATA_TFLAG_WRITE; 3102 3103 ata_qc_set_pc_nbytes(qc); 3104 3105 return 0; 3106 3107 invalid_fld: 3108 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3109 /* "Invalid field in cdb" */ 3110 return 1; 3111 } 3112 3113 /** 3114 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3115 * @qc: Storage for translated ATA taskfile 3116 * @buf: input buffer 3117 * @len: number of valid bytes in the input buffer 3118 * 3119 * Prepare a taskfile to modify caching information for the device. 3120 * 3121 * LOCKING: 3122 * None. 3123 */ 3124 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3125 const u8 *buf, int len) 3126 { 3127 struct ata_taskfile *tf = &qc->tf; 3128 struct ata_device *dev = qc->dev; 3129 char mpage[CACHE_MPAGE_LEN]; 3130 u8 wce; 3131 3132 /* 3133 * The first two bytes of def_cache_mpage are a header, so offsets 3134 * in mpage are off by 2 compared to buf. Same for len. 3135 */ 3136 3137 if (len != CACHE_MPAGE_LEN - 2) 3138 return -EINVAL; 3139 3140 wce = buf[0] & (1 << 2); 3141 3142 /* 3143 * Check that read-only bits are not modified. 3144 */ 3145 ata_msense_caching(dev->id, mpage, false); 3146 mpage[2] &= ~(1 << 2); 3147 mpage[2] |= wce; 3148 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3149 return -EINVAL; 3150 3151 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3152 tf->protocol = ATA_PROT_NODATA; 3153 tf->nsect = 0; 3154 tf->command = ATA_CMD_SET_FEATURES; 3155 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3156 return 0; 3157 } 3158 3159 /** 3160 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3161 * @qc: Storage for translated ATA taskfile 3162 * 3163 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3164 * Assume this is invoked for direct access devices (e.g. disks) only. 3165 * There should be no block descriptor for other device types. 3166 * 3167 * LOCKING: 3168 * spin_lock_irqsave(host lock) 3169 */ 3170 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3171 { 3172 struct scsi_cmnd *scmd = qc->scsicmd; 3173 const u8 *cdb = scmd->cmnd; 3174 const u8 *p; 3175 u8 pg, spg; 3176 unsigned six_byte, pg_len, hdr_len, bd_len; 3177 int len; 3178 3179 VPRINTK("ENTER\n"); 3180 3181 six_byte = (cdb[0] == MODE_SELECT); 3182 if (six_byte) { 3183 if (scmd->cmd_len < 5) 3184 goto invalid_fld; 3185 3186 len = cdb[4]; 3187 hdr_len = 4; 3188 } else { 3189 if (scmd->cmd_len < 9) 3190 goto invalid_fld; 3191 3192 len = (cdb[7] << 8) + cdb[8]; 3193 hdr_len = 8; 3194 } 3195 3196 /* We only support PF=1, SP=0. */ 3197 if ((cdb[1] & 0x11) != 0x10) 3198 goto invalid_fld; 3199 3200 /* Test early for possible overrun. */ 3201 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3202 goto invalid_param_len; 3203 3204 p = page_address(sg_page(scsi_sglist(scmd))); 3205 3206 /* Move past header and block descriptors. */ 3207 if (len < hdr_len) 3208 goto invalid_param_len; 3209 3210 if (six_byte) 3211 bd_len = p[3]; 3212 else 3213 bd_len = (p[6] << 8) + p[7]; 3214 3215 len -= hdr_len; 3216 p += hdr_len; 3217 if (len < bd_len) 3218 goto invalid_param_len; 3219 if (bd_len != 0 && bd_len != 8) 3220 goto invalid_param; 3221 3222 len -= bd_len; 3223 p += bd_len; 3224 if (len == 0) 3225 goto skip; 3226 3227 /* Parse both possible formats for the mode page headers. */ 3228 pg = p[0] & 0x3f; 3229 if (p[0] & 0x40) { 3230 if (len < 4) 3231 goto invalid_param_len; 3232 3233 spg = p[1]; 3234 pg_len = (p[2] << 8) | p[3]; 3235 p += 4; 3236 len -= 4; 3237 } else { 3238 if (len < 2) 3239 goto invalid_param_len; 3240 3241 spg = 0; 3242 pg_len = p[1]; 3243 p += 2; 3244 len -= 2; 3245 } 3246 3247 /* 3248 * No mode subpages supported (yet) but asking for _all_ 3249 * subpages may be valid 3250 */ 3251 if (spg && (spg != ALL_SUB_MPAGES)) 3252 goto invalid_param; 3253 if (pg_len > len) 3254 goto invalid_param_len; 3255 3256 switch (pg) { 3257 case CACHE_MPAGE: 3258 if (ata_mselect_caching(qc, p, pg_len) < 0) 3259 goto invalid_param; 3260 break; 3261 3262 default: /* invalid page code */ 3263 goto invalid_param; 3264 } 3265 3266 /* 3267 * Only one page has changeable data, so we only support setting one 3268 * page at a time. 3269 */ 3270 if (len > pg_len) 3271 goto invalid_param; 3272 3273 return 0; 3274 3275 invalid_fld: 3276 /* "Invalid field in CDB" */ 3277 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3278 return 1; 3279 3280 invalid_param: 3281 /* "Invalid field in parameter list" */ 3282 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3283 return 1; 3284 3285 invalid_param_len: 3286 /* "Parameter list length error" */ 3287 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3288 return 1; 3289 3290 skip: 3291 scmd->result = SAM_STAT_GOOD; 3292 return 1; 3293 } 3294 3295 /** 3296 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3297 * @dev: ATA device 3298 * @cmd: SCSI command opcode to consider 3299 * 3300 * Look up the SCSI command given, and determine whether the 3301 * SCSI command is to be translated or simulated. 3302 * 3303 * RETURNS: 3304 * Pointer to translation function if possible, %NULL if not. 3305 */ 3306 3307 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3308 { 3309 switch (cmd) { 3310 case READ_6: 3311 case READ_10: 3312 case READ_16: 3313 3314 case WRITE_6: 3315 case WRITE_10: 3316 case WRITE_16: 3317 return ata_scsi_rw_xlat; 3318 3319 case WRITE_SAME_16: 3320 return ata_scsi_write_same_xlat; 3321 3322 case SYNCHRONIZE_CACHE: 3323 if (ata_try_flush_cache(dev)) 3324 return ata_scsi_flush_xlat; 3325 break; 3326 3327 case VERIFY: 3328 case VERIFY_16: 3329 return ata_scsi_verify_xlat; 3330 3331 case ATA_12: 3332 case ATA_16: 3333 return ata_scsi_pass_thru; 3334 3335 case MODE_SELECT: 3336 case MODE_SELECT_10: 3337 return ata_scsi_mode_select_xlat; 3338 break; 3339 3340 case START_STOP: 3341 return ata_scsi_start_stop_xlat; 3342 } 3343 3344 return NULL; 3345 } 3346 3347 /** 3348 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3349 * @ap: ATA port to which the command was being sent 3350 * @cmd: SCSI command to dump 3351 * 3352 * Prints the contents of a SCSI command via printk(). 3353 */ 3354 3355 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3356 struct scsi_cmnd *cmd) 3357 { 3358 #ifdef ATA_DEBUG 3359 struct scsi_device *scsidev = cmd->device; 3360 u8 *scsicmd = cmd->cmnd; 3361 3362 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3363 ap->print_id, 3364 scsidev->channel, scsidev->id, scsidev->lun, 3365 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3366 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3367 scsicmd[8]); 3368 #endif 3369 } 3370 3371 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3372 struct ata_device *dev) 3373 { 3374 u8 scsi_op = scmd->cmnd[0]; 3375 ata_xlat_func_t xlat_func; 3376 int rc = 0; 3377 3378 if (dev->class == ATA_DEV_ATA) { 3379 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3380 goto bad_cdb_len; 3381 3382 xlat_func = ata_get_xlat_func(dev, scsi_op); 3383 } else { 3384 if (unlikely(!scmd->cmd_len)) 3385 goto bad_cdb_len; 3386 3387 xlat_func = NULL; 3388 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3389 /* relay SCSI command to ATAPI device */ 3390 int len = COMMAND_SIZE(scsi_op); 3391 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3392 goto bad_cdb_len; 3393 3394 xlat_func = atapi_xlat; 3395 } else { 3396 /* ATA_16 passthru, treat as an ATA command */ 3397 if (unlikely(scmd->cmd_len > 16)) 3398 goto bad_cdb_len; 3399 3400 xlat_func = ata_get_xlat_func(dev, scsi_op); 3401 } 3402 } 3403 3404 if (xlat_func) 3405 rc = ata_scsi_translate(dev, scmd, xlat_func); 3406 else 3407 ata_scsi_simulate(dev, scmd); 3408 3409 return rc; 3410 3411 bad_cdb_len: 3412 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3413 scmd->cmd_len, scsi_op, dev->cdb_len); 3414 scmd->result = DID_ERROR << 16; 3415 scmd->scsi_done(scmd); 3416 return 0; 3417 } 3418 3419 /** 3420 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3421 * @shost: SCSI host of command to be sent 3422 * @cmd: SCSI command to be sent 3423 * 3424 * In some cases, this function translates SCSI commands into 3425 * ATA taskfiles, and queues the taskfiles to be sent to 3426 * hardware. In other cases, this function simulates a 3427 * SCSI device by evaluating and responding to certain 3428 * SCSI commands. This creates the overall effect of 3429 * ATA and ATAPI devices appearing as SCSI devices. 3430 * 3431 * LOCKING: 3432 * ATA host lock 3433 * 3434 * RETURNS: 3435 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3436 * 0 otherwise. 3437 */ 3438 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3439 { 3440 struct ata_port *ap; 3441 struct ata_device *dev; 3442 struct scsi_device *scsidev = cmd->device; 3443 int rc = 0; 3444 unsigned long irq_flags; 3445 3446 ap = ata_shost_to_port(shost); 3447 3448 spin_lock_irqsave(ap->lock, irq_flags); 3449 3450 ata_scsi_dump_cdb(ap, cmd); 3451 3452 dev = ata_scsi_find_dev(ap, scsidev); 3453 if (likely(dev)) 3454 rc = __ata_scsi_queuecmd(cmd, dev); 3455 else { 3456 cmd->result = (DID_BAD_TARGET << 16); 3457 cmd->scsi_done(cmd); 3458 } 3459 3460 spin_unlock_irqrestore(ap->lock, irq_flags); 3461 3462 return rc; 3463 } 3464 3465 /** 3466 * ata_scsi_simulate - simulate SCSI command on ATA device 3467 * @dev: the target device 3468 * @cmd: SCSI command being sent to device. 3469 * 3470 * Interprets and directly executes a select list of SCSI commands 3471 * that can be handled internally. 3472 * 3473 * LOCKING: 3474 * spin_lock_irqsave(host lock) 3475 */ 3476 3477 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3478 { 3479 struct ata_scsi_args args; 3480 const u8 *scsicmd = cmd->cmnd; 3481 u8 tmp8; 3482 3483 args.dev = dev; 3484 args.id = dev->id; 3485 args.cmd = cmd; 3486 args.done = cmd->scsi_done; 3487 3488 switch(scsicmd[0]) { 3489 /* TODO: worth improving? */ 3490 case FORMAT_UNIT: 3491 ata_scsi_invalid_field(cmd); 3492 break; 3493 3494 case INQUIRY: 3495 if (scsicmd[1] & 2) /* is CmdDt set? */ 3496 ata_scsi_invalid_field(cmd); 3497 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3498 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3499 else switch (scsicmd[2]) { 3500 case 0x00: 3501 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3502 break; 3503 case 0x80: 3504 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3505 break; 3506 case 0x83: 3507 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3508 break; 3509 case 0x89: 3510 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3511 break; 3512 case 0xb0: 3513 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3514 break; 3515 case 0xb1: 3516 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3517 break; 3518 case 0xb2: 3519 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3520 break; 3521 default: 3522 ata_scsi_invalid_field(cmd); 3523 break; 3524 } 3525 break; 3526 3527 case MODE_SENSE: 3528 case MODE_SENSE_10: 3529 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3530 break; 3531 3532 case READ_CAPACITY: 3533 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3534 break; 3535 3536 case SERVICE_ACTION_IN: 3537 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3538 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3539 else 3540 ata_scsi_invalid_field(cmd); 3541 break; 3542 3543 case REPORT_LUNS: 3544 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3545 break; 3546 3547 case REQUEST_SENSE: 3548 ata_scsi_set_sense(cmd, 0, 0, 0); 3549 cmd->result = (DRIVER_SENSE << 24); 3550 cmd->scsi_done(cmd); 3551 break; 3552 3553 /* if we reach this, then writeback caching is disabled, 3554 * turning this into a no-op. 3555 */ 3556 case SYNCHRONIZE_CACHE: 3557 /* fall through */ 3558 3559 /* no-op's, complete with success */ 3560 case REZERO_UNIT: 3561 case SEEK_6: 3562 case SEEK_10: 3563 case TEST_UNIT_READY: 3564 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3565 break; 3566 3567 case SEND_DIAGNOSTIC: 3568 tmp8 = scsicmd[1] & ~(1 << 3); 3569 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3570 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3571 else 3572 ata_scsi_invalid_field(cmd); 3573 break; 3574 3575 /* all other commands */ 3576 default: 3577 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3578 /* "Invalid command operation code" */ 3579 cmd->scsi_done(cmd); 3580 break; 3581 } 3582 } 3583 3584 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3585 { 3586 int i, rc; 3587 3588 for (i = 0; i < host->n_ports; i++) { 3589 struct ata_port *ap = host->ports[i]; 3590 struct Scsi_Host *shost; 3591 3592 rc = -ENOMEM; 3593 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3594 if (!shost) 3595 goto err_alloc; 3596 3597 shost->eh_noresume = 1; 3598 *(struct ata_port **)&shost->hostdata[0] = ap; 3599 ap->scsi_host = shost; 3600 3601 shost->transportt = ata_scsi_transport_template; 3602 shost->unique_id = ap->print_id; 3603 shost->max_id = 16; 3604 shost->max_lun = 1; 3605 shost->max_channel = 1; 3606 shost->max_cmd_len = 16; 3607 3608 /* Schedule policy is determined by ->qc_defer() 3609 * callback and it needs to see every deferred qc. 3610 * Set host_blocked to 1 to prevent SCSI midlayer from 3611 * automatically deferring requests. 3612 */ 3613 shost->max_host_blocked = 1; 3614 3615 rc = scsi_add_host_with_dma(ap->scsi_host, 3616 &ap->tdev, ap->host->dev); 3617 if (rc) 3618 goto err_add; 3619 } 3620 3621 return 0; 3622 3623 err_add: 3624 scsi_host_put(host->ports[i]->scsi_host); 3625 err_alloc: 3626 while (--i >= 0) { 3627 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3628 3629 scsi_remove_host(shost); 3630 scsi_host_put(shost); 3631 } 3632 return rc; 3633 } 3634 3635 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3636 { 3637 int tries = 5; 3638 struct ata_device *last_failed_dev = NULL; 3639 struct ata_link *link; 3640 struct ata_device *dev; 3641 3642 repeat: 3643 ata_for_each_link(link, ap, EDGE) { 3644 ata_for_each_dev(dev, link, ENABLED) { 3645 struct scsi_device *sdev; 3646 int channel = 0, id = 0; 3647 3648 if (dev->sdev) 3649 continue; 3650 3651 if (ata_is_host_link(link)) 3652 id = dev->devno; 3653 else 3654 channel = link->pmp; 3655 3656 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3657 NULL); 3658 if (!IS_ERR(sdev)) { 3659 dev->sdev = sdev; 3660 scsi_device_put(sdev); 3661 ata_acpi_bind(dev); 3662 } else { 3663 dev->sdev = NULL; 3664 } 3665 } 3666 } 3667 3668 /* If we scanned while EH was in progress or allocation 3669 * failure occurred, scan would have failed silently. Check 3670 * whether all devices are attached. 3671 */ 3672 ata_for_each_link(link, ap, EDGE) { 3673 ata_for_each_dev(dev, link, ENABLED) { 3674 if (!dev->sdev) 3675 goto exit_loop; 3676 } 3677 } 3678 exit_loop: 3679 if (!link) 3680 return; 3681 3682 /* we're missing some SCSI devices */ 3683 if (sync) { 3684 /* If caller requested synchrnous scan && we've made 3685 * any progress, sleep briefly and repeat. 3686 */ 3687 if (dev != last_failed_dev) { 3688 msleep(100); 3689 last_failed_dev = dev; 3690 goto repeat; 3691 } 3692 3693 /* We might be failing to detect boot device, give it 3694 * a few more chances. 3695 */ 3696 if (--tries) { 3697 msleep(100); 3698 goto repeat; 3699 } 3700 3701 ata_port_err(ap, 3702 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3703 } 3704 3705 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3706 round_jiffies_relative(HZ)); 3707 } 3708 3709 /** 3710 * ata_scsi_offline_dev - offline attached SCSI device 3711 * @dev: ATA device to offline attached SCSI device for 3712 * 3713 * This function is called from ata_eh_hotplug() and responsible 3714 * for taking the SCSI device attached to @dev offline. This 3715 * function is called with host lock which protects dev->sdev 3716 * against clearing. 3717 * 3718 * LOCKING: 3719 * spin_lock_irqsave(host lock) 3720 * 3721 * RETURNS: 3722 * 1 if attached SCSI device exists, 0 otherwise. 3723 */ 3724 int ata_scsi_offline_dev(struct ata_device *dev) 3725 { 3726 if (dev->sdev) { 3727 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3728 return 1; 3729 } 3730 return 0; 3731 } 3732 3733 /** 3734 * ata_scsi_remove_dev - remove attached SCSI device 3735 * @dev: ATA device to remove attached SCSI device for 3736 * 3737 * This function is called from ata_eh_scsi_hotplug() and 3738 * responsible for removing the SCSI device attached to @dev. 3739 * 3740 * LOCKING: 3741 * Kernel thread context (may sleep). 3742 */ 3743 static void ata_scsi_remove_dev(struct ata_device *dev) 3744 { 3745 struct ata_port *ap = dev->link->ap; 3746 struct scsi_device *sdev; 3747 unsigned long flags; 3748 3749 /* Alas, we need to grab scan_mutex to ensure SCSI device 3750 * state doesn't change underneath us and thus 3751 * scsi_device_get() always succeeds. The mutex locking can 3752 * be removed if there is __scsi_device_get() interface which 3753 * increments reference counts regardless of device state. 3754 */ 3755 mutex_lock(&ap->scsi_host->scan_mutex); 3756 spin_lock_irqsave(ap->lock, flags); 3757 3758 ata_acpi_unbind(dev); 3759 3760 /* clearing dev->sdev is protected by host lock */ 3761 sdev = dev->sdev; 3762 dev->sdev = NULL; 3763 3764 if (sdev) { 3765 /* If user initiated unplug races with us, sdev can go 3766 * away underneath us after the host lock and 3767 * scan_mutex are released. Hold onto it. 3768 */ 3769 if (scsi_device_get(sdev) == 0) { 3770 /* The following ensures the attached sdev is 3771 * offline on return from ata_scsi_offline_dev() 3772 * regardless it wins or loses the race 3773 * against this function. 3774 */ 3775 scsi_device_set_state(sdev, SDEV_OFFLINE); 3776 } else { 3777 WARN_ON(1); 3778 sdev = NULL; 3779 } 3780 } 3781 3782 spin_unlock_irqrestore(ap->lock, flags); 3783 mutex_unlock(&ap->scsi_host->scan_mutex); 3784 3785 if (sdev) { 3786 ata_dev_info(dev, "detaching (SCSI %s)\n", 3787 dev_name(&sdev->sdev_gendev)); 3788 3789 scsi_remove_device(sdev); 3790 scsi_device_put(sdev); 3791 } 3792 } 3793 3794 static void ata_scsi_handle_link_detach(struct ata_link *link) 3795 { 3796 struct ata_port *ap = link->ap; 3797 struct ata_device *dev; 3798 3799 ata_for_each_dev(dev, link, ALL) { 3800 unsigned long flags; 3801 3802 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3803 continue; 3804 3805 spin_lock_irqsave(ap->lock, flags); 3806 dev->flags &= ~ATA_DFLAG_DETACHED; 3807 spin_unlock_irqrestore(ap->lock, flags); 3808 3809 ata_scsi_remove_dev(dev); 3810 } 3811 } 3812 3813 /** 3814 * ata_scsi_media_change_notify - send media change event 3815 * @dev: Pointer to the disk device with media change event 3816 * 3817 * Tell the block layer to send a media change notification 3818 * event. 3819 * 3820 * LOCKING: 3821 * spin_lock_irqsave(host lock) 3822 */ 3823 void ata_scsi_media_change_notify(struct ata_device *dev) 3824 { 3825 if (dev->sdev) 3826 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3827 GFP_ATOMIC); 3828 } 3829 3830 /** 3831 * ata_scsi_hotplug - SCSI part of hotplug 3832 * @work: Pointer to ATA port to perform SCSI hotplug on 3833 * 3834 * Perform SCSI part of hotplug. It's executed from a separate 3835 * workqueue after EH completes. This is necessary because SCSI 3836 * hot plugging requires working EH and hot unplugging is 3837 * synchronized with hot plugging with a mutex. 3838 * 3839 * LOCKING: 3840 * Kernel thread context (may sleep). 3841 */ 3842 void ata_scsi_hotplug(struct work_struct *work) 3843 { 3844 struct ata_port *ap = 3845 container_of(work, struct ata_port, hotplug_task.work); 3846 int i; 3847 3848 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3849 DPRINTK("ENTER/EXIT - unloading\n"); 3850 return; 3851 } 3852 3853 DPRINTK("ENTER\n"); 3854 mutex_lock(&ap->scsi_scan_mutex); 3855 3856 /* Unplug detached devices. We cannot use link iterator here 3857 * because PMP links have to be scanned even if PMP is 3858 * currently not attached. Iterate manually. 3859 */ 3860 ata_scsi_handle_link_detach(&ap->link); 3861 if (ap->pmp_link) 3862 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3863 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3864 3865 /* scan for new ones */ 3866 ata_scsi_scan_host(ap, 0); 3867 3868 mutex_unlock(&ap->scsi_scan_mutex); 3869 DPRINTK("EXIT\n"); 3870 } 3871 3872 /** 3873 * ata_scsi_user_scan - indication for user-initiated bus scan 3874 * @shost: SCSI host to scan 3875 * @channel: Channel to scan 3876 * @id: ID to scan 3877 * @lun: LUN to scan 3878 * 3879 * This function is called when user explicitly requests bus 3880 * scan. Set probe pending flag and invoke EH. 3881 * 3882 * LOCKING: 3883 * SCSI layer (we don't care) 3884 * 3885 * RETURNS: 3886 * Zero. 3887 */ 3888 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3889 unsigned int id, unsigned int lun) 3890 { 3891 struct ata_port *ap = ata_shost_to_port(shost); 3892 unsigned long flags; 3893 int devno, rc = 0; 3894 3895 if (!ap->ops->error_handler) 3896 return -EOPNOTSUPP; 3897 3898 if (lun != SCAN_WILD_CARD && lun) 3899 return -EINVAL; 3900 3901 if (!sata_pmp_attached(ap)) { 3902 if (channel != SCAN_WILD_CARD && channel) 3903 return -EINVAL; 3904 devno = id; 3905 } else { 3906 if (id != SCAN_WILD_CARD && id) 3907 return -EINVAL; 3908 devno = channel; 3909 } 3910 3911 spin_lock_irqsave(ap->lock, flags); 3912 3913 if (devno == SCAN_WILD_CARD) { 3914 struct ata_link *link; 3915 3916 ata_for_each_link(link, ap, EDGE) { 3917 struct ata_eh_info *ehi = &link->eh_info; 3918 ehi->probe_mask |= ATA_ALL_DEVICES; 3919 ehi->action |= ATA_EH_RESET; 3920 } 3921 } else { 3922 struct ata_device *dev = ata_find_dev(ap, devno); 3923 3924 if (dev) { 3925 struct ata_eh_info *ehi = &dev->link->eh_info; 3926 ehi->probe_mask |= 1 << dev->devno; 3927 ehi->action |= ATA_EH_RESET; 3928 } else 3929 rc = -EINVAL; 3930 } 3931 3932 if (rc == 0) { 3933 ata_port_schedule_eh(ap); 3934 spin_unlock_irqrestore(ap->lock, flags); 3935 ata_port_wait_eh(ap); 3936 } else 3937 spin_unlock_irqrestore(ap->lock, flags); 3938 3939 return rc; 3940 } 3941 3942 /** 3943 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3944 * @work: Pointer to ATA port to perform scsi_rescan_device() 3945 * 3946 * After ATA pass thru (SAT) commands are executed successfully, 3947 * libata need to propagate the changes to SCSI layer. 3948 * 3949 * LOCKING: 3950 * Kernel thread context (may sleep). 3951 */ 3952 void ata_scsi_dev_rescan(struct work_struct *work) 3953 { 3954 struct ata_port *ap = 3955 container_of(work, struct ata_port, scsi_rescan_task); 3956 struct ata_link *link; 3957 struct ata_device *dev; 3958 unsigned long flags; 3959 3960 mutex_lock(&ap->scsi_scan_mutex); 3961 spin_lock_irqsave(ap->lock, flags); 3962 3963 ata_for_each_link(link, ap, EDGE) { 3964 ata_for_each_dev(dev, link, ENABLED) { 3965 struct scsi_device *sdev = dev->sdev; 3966 3967 if (!sdev) 3968 continue; 3969 if (scsi_device_get(sdev)) 3970 continue; 3971 3972 spin_unlock_irqrestore(ap->lock, flags); 3973 scsi_rescan_device(&(sdev->sdev_gendev)); 3974 scsi_device_put(sdev); 3975 spin_lock_irqsave(ap->lock, flags); 3976 } 3977 } 3978 3979 spin_unlock_irqrestore(ap->lock, flags); 3980 mutex_unlock(&ap->scsi_scan_mutex); 3981 } 3982 3983 /** 3984 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3985 * @host: ATA host container for all SAS ports 3986 * @port_info: Information from low-level host driver 3987 * @shost: SCSI host that the scsi device is attached to 3988 * 3989 * LOCKING: 3990 * PCI/etc. bus probe sem. 3991 * 3992 * RETURNS: 3993 * ata_port pointer on success / NULL on failure. 3994 */ 3995 3996 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3997 struct ata_port_info *port_info, 3998 struct Scsi_Host *shost) 3999 { 4000 struct ata_port *ap; 4001 4002 ap = ata_port_alloc(host); 4003 if (!ap) 4004 return NULL; 4005 4006 ap->port_no = 0; 4007 ap->lock = &host->lock; 4008 ap->pio_mask = port_info->pio_mask; 4009 ap->mwdma_mask = port_info->mwdma_mask; 4010 ap->udma_mask = port_info->udma_mask; 4011 ap->flags |= port_info->flags; 4012 ap->ops = port_info->port_ops; 4013 ap->cbl = ATA_CBL_SATA; 4014 4015 return ap; 4016 } 4017 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4018 4019 /** 4020 * ata_sas_port_start - Set port up for dma. 4021 * @ap: Port to initialize 4022 * 4023 * Called just after data structures for each port are 4024 * initialized. 4025 * 4026 * May be used as the port_start() entry in ata_port_operations. 4027 * 4028 * LOCKING: 4029 * Inherited from caller. 4030 */ 4031 int ata_sas_port_start(struct ata_port *ap) 4032 { 4033 /* 4034 * the port is marked as frozen at allocation time, but if we don't 4035 * have new eh, we won't thaw it 4036 */ 4037 if (!ap->ops->error_handler) 4038 ap->pflags &= ~ATA_PFLAG_FROZEN; 4039 return 0; 4040 } 4041 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4042 4043 /** 4044 * ata_port_stop - Undo ata_sas_port_start() 4045 * @ap: Port to shut down 4046 * 4047 * May be used as the port_stop() entry in ata_port_operations. 4048 * 4049 * LOCKING: 4050 * Inherited from caller. 4051 */ 4052 4053 void ata_sas_port_stop(struct ata_port *ap) 4054 { 4055 } 4056 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4057 4058 /** 4059 * ata_sas_async_probe - simply schedule probing and return 4060 * @ap: Port to probe 4061 * 4062 * For batch scheduling of probe for sas attached ata devices, assumes 4063 * the port has already been through ata_sas_port_init() 4064 */ 4065 void ata_sas_async_probe(struct ata_port *ap) 4066 { 4067 __ata_port_probe(ap); 4068 } 4069 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4070 4071 int ata_sas_sync_probe(struct ata_port *ap) 4072 { 4073 return ata_port_probe(ap); 4074 } 4075 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4076 4077 4078 /** 4079 * ata_sas_port_init - Initialize a SATA device 4080 * @ap: SATA port to initialize 4081 * 4082 * LOCKING: 4083 * PCI/etc. bus probe sem. 4084 * 4085 * RETURNS: 4086 * Zero on success, non-zero on error. 4087 */ 4088 4089 int ata_sas_port_init(struct ata_port *ap) 4090 { 4091 int rc = ap->ops->port_start(ap); 4092 4093 if (rc) 4094 return rc; 4095 ap->print_id = atomic_inc_return(&ata_print_id); 4096 return 0; 4097 } 4098 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4099 4100 /** 4101 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4102 * @ap: SATA port to destroy 4103 * 4104 */ 4105 4106 void ata_sas_port_destroy(struct ata_port *ap) 4107 { 4108 if (ap->ops->port_stop) 4109 ap->ops->port_stop(ap); 4110 kfree(ap); 4111 } 4112 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4113 4114 /** 4115 * ata_sas_slave_configure - Default slave_config routine for libata devices 4116 * @sdev: SCSI device to configure 4117 * @ap: ATA port to which SCSI device is attached 4118 * 4119 * RETURNS: 4120 * Zero. 4121 */ 4122 4123 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4124 { 4125 ata_scsi_sdev_config(sdev); 4126 ata_scsi_dev_config(sdev, ap->link.device); 4127 return 0; 4128 } 4129 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4130 4131 /** 4132 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4133 * @cmd: SCSI command to be sent 4134 * @ap: ATA port to which the command is being sent 4135 * 4136 * RETURNS: 4137 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4138 * 0 otherwise. 4139 */ 4140 4141 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4142 { 4143 int rc = 0; 4144 4145 ata_scsi_dump_cdb(ap, cmd); 4146 4147 if (likely(ata_dev_enabled(ap->link.device))) 4148 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4149 else { 4150 cmd->result = (DID_BAD_TARGET << 16); 4151 cmd->scsi_done(cmd); 4152 } 4153 return rc; 4154 } 4155 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4156