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