1/* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Tejun Heo <tj@kernel.org> 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 59static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 60static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 61 62typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 63 64static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66static 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 79static 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 89static 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 98static 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 107static 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 114static ssize_t ata_scsi_lpm_store(struct device *device, 115 struct device_attribute *attr, 116 const char *buf, size_t count) 117{ 118 struct Scsi_Host *shost = class_to_shost(device); 119 struct ata_port *ap = ata_shost_to_port(shost); 120 struct ata_link *link; 121 struct ata_device *dev; 122 enum ata_lpm_policy policy; 123 unsigned long flags; 124 125 /* UNKNOWN is internal state, iterate from MAX_POWER */ 126 for (policy = ATA_LPM_MAX_POWER; 127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 128 const char *name = ata_lpm_policy_names[policy]; 129 130 if (strncmp(name, buf, strlen(name)) == 0) 131 break; 132 } 133 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 134 return -EINVAL; 135 136 spin_lock_irqsave(ap->lock, flags); 137 138 ata_for_each_link(link, ap, EDGE) { 139 ata_for_each_dev(dev, &ap->link, ENABLED) { 140 if (dev->horkage & ATA_HORKAGE_NOLPM) { 141 count = -EOPNOTSUPP; 142 goto out_unlock; 143 } 144 } 145 } 146 147 ap->target_lpm_policy = policy; 148 ata_port_schedule_eh(ap); 149out_unlock: 150 spin_unlock_irqrestore(ap->lock, flags); 151 return count; 152} 153 154static ssize_t ata_scsi_lpm_show(struct device *dev, 155 struct device_attribute *attr, char *buf) 156{ 157 struct Scsi_Host *shost = class_to_shost(dev); 158 struct ata_port *ap = ata_shost_to_port(shost); 159 160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 161 return -EINVAL; 162 163 return snprintf(buf, PAGE_SIZE, "%s\n", 164 ata_lpm_policy_names[ap->target_lpm_policy]); 165} 166DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 167 ata_scsi_lpm_show, ata_scsi_lpm_store); 168EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 169 170static ssize_t ata_scsi_park_show(struct device *device, 171 struct device_attribute *attr, char *buf) 172{ 173 struct scsi_device *sdev = to_scsi_device(device); 174 struct ata_port *ap; 175 struct ata_link *link; 176 struct ata_device *dev; 177 unsigned long flags, now; 178 unsigned int uninitialized_var(msecs); 179 int rc = 0; 180 181 ap = ata_shost_to_port(sdev->host); 182 183 spin_lock_irqsave(ap->lock, flags); 184 dev = ata_scsi_find_dev(ap, sdev); 185 if (!dev) { 186 rc = -ENODEV; 187 goto unlock; 188 } 189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 190 rc = -EOPNOTSUPP; 191 goto unlock; 192 } 193 194 link = dev->link; 195 now = jiffies; 196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 197 link->eh_context.unloaded_mask & (1 << dev->devno) && 198 time_after(dev->unpark_deadline, now)) 199 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 200 else 201 msecs = 0; 202 203unlock: 204 spin_unlock_irq(ap->lock); 205 206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 207} 208 209static ssize_t ata_scsi_park_store(struct device *device, 210 struct device_attribute *attr, 211 const char *buf, size_t len) 212{ 213 struct scsi_device *sdev = to_scsi_device(device); 214 struct ata_port *ap; 215 struct ata_device *dev; 216 long int input; 217 unsigned long flags; 218 int rc; 219 220 rc = kstrtol(buf, 10, &input); 221 if (rc) 222 return rc; 223 if (input < -2) 224 return -EINVAL; 225 if (input > ATA_TMOUT_MAX_PARK) { 226 rc = -EOVERFLOW; 227 input = ATA_TMOUT_MAX_PARK; 228 } 229 230 ap = ata_shost_to_port(sdev->host); 231 232 spin_lock_irqsave(ap->lock, flags); 233 dev = ata_scsi_find_dev(ap, sdev); 234 if (unlikely(!dev)) { 235 rc = -ENODEV; 236 goto unlock; 237 } 238 if (dev->class != ATA_DEV_ATA && 239 dev->class != ATA_DEV_ZAC) { 240 rc = -EOPNOTSUPP; 241 goto unlock; 242 } 243 244 if (input >= 0) { 245 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 246 rc = -EOPNOTSUPP; 247 goto unlock; 248 } 249 250 dev->unpark_deadline = ata_deadline(jiffies, input); 251 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 252 ata_port_schedule_eh(ap); 253 complete(&ap->park_req_pending); 254 } else { 255 switch (input) { 256 case -1: 257 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 258 break; 259 case -2: 260 dev->flags |= ATA_DFLAG_NO_UNLOAD; 261 break; 262 } 263 } 264unlock: 265 spin_unlock_irqrestore(ap->lock, flags); 266 267 return rc ? rc : len; 268} 269DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 270 ata_scsi_park_show, ata_scsi_park_store); 271EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 272 273static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 274{ 275 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 276 277 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 278} 279 280static ssize_t 281ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 282 const char *buf, size_t count) 283{ 284 struct Scsi_Host *shost = class_to_shost(dev); 285 struct ata_port *ap = ata_shost_to_port(shost); 286 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 287 return ap->ops->em_store(ap, buf, count); 288 return -EINVAL; 289} 290 291static ssize_t 292ata_scsi_em_message_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 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 299 return ap->ops->em_show(ap, buf); 300 return -EINVAL; 301} 302DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 303 ata_scsi_em_message_show, ata_scsi_em_message_store); 304EXPORT_SYMBOL_GPL(dev_attr_em_message); 305 306static ssize_t 307ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309{ 310 struct Scsi_Host *shost = class_to_shost(dev); 311 struct ata_port *ap = ata_shost_to_port(shost); 312 313 return snprintf(buf, 23, "%d\n", ap->em_message_type); 314} 315DEVICE_ATTR(em_message_type, S_IRUGO, 316 ata_scsi_em_message_type_show, NULL); 317EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 318 319static ssize_t 320ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 321 char *buf) 322{ 323 struct scsi_device *sdev = to_scsi_device(dev); 324 struct ata_port *ap = ata_shost_to_port(sdev->host); 325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 326 327 if (atadev && ap->ops->sw_activity_show && 328 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 329 return ap->ops->sw_activity_show(atadev, buf); 330 return -EINVAL; 331} 332 333static ssize_t 334ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 335 const char *buf, size_t count) 336{ 337 struct scsi_device *sdev = to_scsi_device(dev); 338 struct ata_port *ap = ata_shost_to_port(sdev->host); 339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 340 enum sw_activity val; 341 int rc; 342 343 if (atadev && ap->ops->sw_activity_store && 344 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 345 val = simple_strtoul(buf, NULL, 0); 346 switch (val) { 347 case OFF: case BLINK_ON: case BLINK_OFF: 348 rc = ap->ops->sw_activity_store(atadev, val); 349 if (!rc) 350 return count; 351 else 352 return rc; 353 } 354 } 355 return -EINVAL; 356} 357DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 358 ata_scsi_activity_store); 359EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 360 361struct device_attribute *ata_common_sdev_attrs[] = { 362 &dev_attr_unload_heads, 363 NULL 364}; 365EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 366 367static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 368{ 369 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 370 /* "Invalid field in cbd" */ 371 cmd->scsi_done(cmd); 372} 373 374/** 375 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 376 * @sdev: SCSI device for which BIOS geometry is to be determined 377 * @bdev: block device associated with @sdev 378 * @capacity: capacity of SCSI device 379 * @geom: location to which geometry will be output 380 * 381 * Generic bios head/sector/cylinder calculator 382 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 383 * mapping. Some situations may arise where the disk is not 384 * bootable if this is not used. 385 * 386 * LOCKING: 387 * Defined by the SCSI layer. We don't really care. 388 * 389 * RETURNS: 390 * Zero. 391 */ 392int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 393 sector_t capacity, int geom[]) 394{ 395 geom[0] = 255; 396 geom[1] = 63; 397 sector_div(capacity, 255*63); 398 geom[2] = capacity; 399 400 return 0; 401} 402 403/** 404 * ata_scsi_unlock_native_capacity - unlock native capacity 405 * @sdev: SCSI device to adjust device capacity for 406 * 407 * This function is called if a partition on @sdev extends beyond 408 * the end of the device. It requests EH to unlock HPA. 409 * 410 * LOCKING: 411 * Defined by the SCSI layer. Might sleep. 412 */ 413void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 414{ 415 struct ata_port *ap = ata_shost_to_port(sdev->host); 416 struct ata_device *dev; 417 unsigned long flags; 418 419 spin_lock_irqsave(ap->lock, flags); 420 421 dev = ata_scsi_find_dev(ap, sdev); 422 if (dev && dev->n_sectors < dev->n_native_sectors) { 423 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 424 dev->link->eh_info.action |= ATA_EH_RESET; 425 ata_port_schedule_eh(ap); 426 } 427 428 spin_unlock_irqrestore(ap->lock, flags); 429 ata_port_wait_eh(ap); 430} 431 432/** 433 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 434 * @ap: target port 435 * @sdev: SCSI device to get identify data for 436 * @arg: User buffer area for identify data 437 * 438 * LOCKING: 439 * Defined by the SCSI layer. We don't really care. 440 * 441 * RETURNS: 442 * Zero on success, negative errno on error. 443 */ 444static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 445 void __user *arg) 446{ 447 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 448 u16 __user *dst = arg; 449 char buf[40]; 450 451 if (!dev) 452 return -ENOMSG; 453 454 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 455 return -EFAULT; 456 457 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 458 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 459 return -EFAULT; 460 461 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 462 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 463 return -EFAULT; 464 465 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 466 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 467 return -EFAULT; 468 469 return 0; 470} 471 472/** 473 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 474 * @scsidev: Device to which we are issuing command 475 * @arg: User provided data for issuing command 476 * 477 * LOCKING: 478 * Defined by the SCSI layer. We don't really care. 479 * 480 * RETURNS: 481 * Zero on success, negative errno on error. 482 */ 483int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 484{ 485 int rc = 0; 486 u8 scsi_cmd[MAX_COMMAND_SIZE]; 487 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 488 int argsize = 0; 489 enum dma_data_direction data_dir; 490 int cmd_result; 491 492 if (arg == NULL) 493 return -EINVAL; 494 495 if (copy_from_user(args, arg, sizeof(args))) 496 return -EFAULT; 497 498 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 499 if (!sensebuf) 500 return -ENOMEM; 501 502 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 503 504 if (args[3]) { 505 argsize = ATA_SECT_SIZE * args[3]; 506 argbuf = kmalloc(argsize, GFP_KERNEL); 507 if (argbuf == NULL) { 508 rc = -ENOMEM; 509 goto error; 510 } 511 512 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 513 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 514 block count in sector count field */ 515 data_dir = DMA_FROM_DEVICE; 516 } else { 517 scsi_cmd[1] = (3 << 1); /* Non-data */ 518 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 519 data_dir = DMA_NONE; 520 } 521 522 scsi_cmd[0] = ATA_16; 523 524 scsi_cmd[4] = args[2]; 525 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 526 scsi_cmd[6] = args[3]; 527 scsi_cmd[8] = args[1]; 528 scsi_cmd[10] = 0x4f; 529 scsi_cmd[12] = 0xc2; 530 } else { 531 scsi_cmd[6] = args[1]; 532 } 533 scsi_cmd[14] = args[0]; 534 535 /* Good values for timeout and retries? Values below 536 from scsi_ioctl_send_command() for default case... */ 537 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 538 sensebuf, (10*HZ), 5, 0, NULL); 539 540 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 541 u8 *desc = sensebuf + 8; 542 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 543 544 /* If we set cc then ATA pass-through will cause a 545 * check condition even if no error. Filter that. */ 546 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 547 struct scsi_sense_hdr sshdr; 548 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 549 &sshdr); 550 if (sshdr.sense_key == RECOVERED_ERROR && 551 sshdr.asc == 0 && sshdr.ascq == 0x1d) 552 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 553 } 554 555 /* Send userspace a few ATA registers (same as drivers/ide) */ 556 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 557 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 558 args[0] = desc[13]; /* status */ 559 args[1] = desc[3]; /* error */ 560 args[2] = desc[5]; /* sector count (0:7) */ 561 if (copy_to_user(arg, args, sizeof(args))) 562 rc = -EFAULT; 563 } 564 } 565 566 567 if (cmd_result) { 568 rc = -EIO; 569 goto error; 570 } 571 572 if ((argbuf) 573 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 574 rc = -EFAULT; 575error: 576 kfree(sensebuf); 577 kfree(argbuf); 578 return rc; 579} 580 581/** 582 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 583 * @scsidev: Device to which we are issuing command 584 * @arg: User provided data for issuing command 585 * 586 * LOCKING: 587 * Defined by the SCSI layer. We don't really care. 588 * 589 * RETURNS: 590 * Zero on success, negative errno on error. 591 */ 592int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 593{ 594 int rc = 0; 595 u8 scsi_cmd[MAX_COMMAND_SIZE]; 596 u8 args[7], *sensebuf = NULL; 597 int cmd_result; 598 599 if (arg == NULL) 600 return -EINVAL; 601 602 if (copy_from_user(args, arg, sizeof(args))) 603 return -EFAULT; 604 605 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 606 if (!sensebuf) 607 return -ENOMEM; 608 609 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 610 scsi_cmd[0] = ATA_16; 611 scsi_cmd[1] = (3 << 1); /* Non-data */ 612 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 613 scsi_cmd[4] = args[1]; 614 scsi_cmd[6] = args[2]; 615 scsi_cmd[8] = args[3]; 616 scsi_cmd[10] = args[4]; 617 scsi_cmd[12] = args[5]; 618 scsi_cmd[13] = args[6] & 0x4f; 619 scsi_cmd[14] = args[0]; 620 621 /* Good values for timeout and retries? Values below 622 from scsi_ioctl_send_command() for default case... */ 623 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 624 sensebuf, (10*HZ), 5, 0, NULL); 625 626 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 627 u8 *desc = sensebuf + 8; 628 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 629 630 /* If we set cc then ATA pass-through will cause a 631 * check condition even if no error. Filter that. */ 632 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 633 struct scsi_sense_hdr sshdr; 634 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 635 &sshdr); 636 if (sshdr.sense_key == RECOVERED_ERROR && 637 sshdr.asc == 0 && sshdr.ascq == 0x1d) 638 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 639 } 640 641 /* Send userspace ATA registers */ 642 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 643 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 644 args[0] = desc[13]; /* status */ 645 args[1] = desc[3]; /* error */ 646 args[2] = desc[5]; /* sector count (0:7) */ 647 args[3] = desc[7]; /* lbal */ 648 args[4] = desc[9]; /* lbam */ 649 args[5] = desc[11]; /* lbah */ 650 args[6] = desc[12]; /* select */ 651 if (copy_to_user(arg, args, sizeof(args))) 652 rc = -EFAULT; 653 } 654 } 655 656 if (cmd_result) { 657 rc = -EIO; 658 goto error; 659 } 660 661 error: 662 kfree(sensebuf); 663 return rc; 664} 665 666static int ata_ioc32(struct ata_port *ap) 667{ 668 if (ap->flags & ATA_FLAG_PIO_DMA) 669 return 1; 670 if (ap->pflags & ATA_PFLAG_PIO32) 671 return 1; 672 return 0; 673} 674 675int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 676 int cmd, void __user *arg) 677{ 678 unsigned long val; 679 int rc = -EINVAL; 680 unsigned long flags; 681 682 switch (cmd) { 683 case HDIO_GET_32BIT: 684 spin_lock_irqsave(ap->lock, flags); 685 val = ata_ioc32(ap); 686 spin_unlock_irqrestore(ap->lock, flags); 687 return put_user(val, (unsigned long __user *)arg); 688 689 case HDIO_SET_32BIT: 690 val = (unsigned long) arg; 691 rc = 0; 692 spin_lock_irqsave(ap->lock, flags); 693 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 694 if (val) 695 ap->pflags |= ATA_PFLAG_PIO32; 696 else 697 ap->pflags &= ~ATA_PFLAG_PIO32; 698 } else { 699 if (val != ata_ioc32(ap)) 700 rc = -EINVAL; 701 } 702 spin_unlock_irqrestore(ap->lock, flags); 703 return rc; 704 705 case HDIO_GET_IDENTITY: 706 return ata_get_identity(ap, scsidev, arg); 707 708 case HDIO_DRIVE_CMD: 709 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 710 return -EACCES; 711 return ata_cmd_ioctl(scsidev, arg); 712 713 case HDIO_DRIVE_TASK: 714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 715 return -EACCES; 716 return ata_task_ioctl(scsidev, arg); 717 718 default: 719 rc = -ENOTTY; 720 break; 721 } 722 723 return rc; 724} 725EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 726 727int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 728{ 729 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 730 scsidev, cmd, arg); 731} 732EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 733 734/** 735 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 736 * @dev: ATA device to which the new command is attached 737 * @cmd: SCSI command that originated this ATA command 738 * 739 * Obtain a reference to an unused ata_queued_cmd structure, 740 * which is the basic libata structure representing a single 741 * ATA command sent to the hardware. 742 * 743 * If a command was available, fill in the SCSI-specific 744 * portions of the structure with information on the 745 * current command. 746 * 747 * LOCKING: 748 * spin_lock_irqsave(host lock) 749 * 750 * RETURNS: 751 * Command allocated, or %NULL if none available. 752 */ 753static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 754 struct scsi_cmnd *cmd) 755{ 756 struct ata_queued_cmd *qc; 757 758 qc = ata_qc_new_init(dev, cmd->request->tag); 759 if (qc) { 760 qc->scsicmd = cmd; 761 qc->scsidone = cmd->scsi_done; 762 763 qc->sg = scsi_sglist(cmd); 764 qc->n_elem = scsi_sg_count(cmd); 765 } else { 766 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 767 cmd->scsi_done(cmd); 768 } 769 770 return qc; 771} 772 773static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 774{ 775 struct scsi_cmnd *scmd = qc->scsicmd; 776 777 qc->extrabytes = scmd->request->extra_len; 778 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 779} 780 781/** 782 * ata_dump_status - user friendly display of error info 783 * @id: id of the port in question 784 * @tf: ptr to filled out taskfile 785 * 786 * Decode and dump the ATA error/status registers for the user so 787 * that they have some idea what really happened at the non 788 * make-believe layer. 789 * 790 * LOCKING: 791 * inherited from caller 792 */ 793static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 794{ 795 u8 stat = tf->command, err = tf->feature; 796 797 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 798 if (stat & ATA_BUSY) { 799 printk("Busy }\n"); /* Data is not valid in this case */ 800 } else { 801 if (stat & ATA_DRDY) printk("DriveReady "); 802 if (stat & ATA_DF) printk("DeviceFault "); 803 if (stat & ATA_DSC) printk("SeekComplete "); 804 if (stat & ATA_DRQ) printk("DataRequest "); 805 if (stat & ATA_CORR) printk("CorrectedError "); 806 if (stat & ATA_SENSE) printk("Sense "); 807 if (stat & ATA_ERR) printk("Error "); 808 printk("}\n"); 809 810 if (err) { 811 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 812 if (err & ATA_ABORTED) printk("DriveStatusError "); 813 if (err & ATA_ICRC) { 814 if (err & ATA_ABORTED) 815 printk("BadCRC "); 816 else printk("Sector "); 817 } 818 if (err & ATA_UNC) printk("UncorrectableError "); 819 if (err & ATA_IDNF) printk("SectorIdNotFound "); 820 if (err & ATA_TRK0NF) printk("TrackZeroNotFound "); 821 if (err & ATA_AMNF) printk("AddrMarkNotFound "); 822 printk("}\n"); 823 } 824 } 825} 826 827/** 828 * ata_to_sense_error - convert ATA error to SCSI error 829 * @id: ATA device number 830 * @drv_stat: value contained in ATA status register 831 * @drv_err: value contained in ATA error register 832 * @sk: the sense key we'll fill out 833 * @asc: the additional sense code we'll fill out 834 * @ascq: the additional sense code qualifier we'll fill out 835 * @verbose: be verbose 836 * 837 * Converts an ATA error into a SCSI error. Fill out pointers to 838 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 839 * format sense blocks. 840 * 841 * LOCKING: 842 * spin_lock_irqsave(host lock) 843 */ 844static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 845 u8 *asc, u8 *ascq, int verbose) 846{ 847 int i; 848 849 /* Based on the 3ware driver translation table */ 850 static const unsigned char sense_table[][4] = { 851 /* BBD|ECC|ID|MAR */ 852 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, 853 // Device busy Aborted command 854 /* BBD|ECC|ID */ 855 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, 856 // Device busy Aborted command 857 /* ECC|MC|MARK */ 858 {0x61, HARDWARE_ERROR, 0x00, 0x00}, 859 // Device fault Hardware error 860 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 861 {0x84, ABORTED_COMMAND, 0x47, 0x00}, 862 // Data CRC error SCSI parity error 863 /* MC|ID|ABRT|TRK0|MARK */ 864 {0x37, NOT_READY, 0x04, 0x00}, 865 // Unit offline Not ready 866 /* MCR|MARK */ 867 {0x09, NOT_READY, 0x04, 0x00}, 868 // Unrecovered disk error Not ready 869 /* Bad address mark */ 870 {0x01, MEDIUM_ERROR, 0x13, 0x00}, 871 // Address mark not found for data field 872 /* TRK0 - Track 0 not found */ 873 {0x02, HARDWARE_ERROR, 0x00, 0x00}, 874 // Hardware error 875 /* Abort: 0x04 is not translated here, see below */ 876 /* Media change request */ 877 {0x08, NOT_READY, 0x04, 0x00}, 878 // FIXME: faking offline 879 /* SRV/IDNF - ID not found */ 880 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, 881 // Logical address out of range 882 /* MC - Media Changed */ 883 {0x20, UNIT_ATTENTION, 0x28, 0x00}, 884 // Not ready to ready change, medium may have changed 885 /* ECC - Uncorrectable ECC error */ 886 {0x40, MEDIUM_ERROR, 0x11, 0x04}, 887 // Unrecovered read error 888 /* BBD - block marked bad */ 889 {0x80, MEDIUM_ERROR, 0x11, 0x04}, 890 // Block marked bad Medium error, unrecovered read error 891 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 892 }; 893 static const unsigned char stat_table[][4] = { 894 /* Must be first because BUSY means no other bits valid */ 895 {0x80, ABORTED_COMMAND, 0x47, 0x00}, 896 // Busy, fake parity for now 897 {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, 898 // Device ready, unaligned write command 899 {0x20, HARDWARE_ERROR, 0x44, 0x00}, 900 // Device fault, internal target failure 901 {0x08, ABORTED_COMMAND, 0x47, 0x00}, 902 // Timed out in xfer, fake parity for now 903 {0x04, RECOVERED_ERROR, 0x11, 0x00}, 904 // Recovered ECC error Medium error, recovered 905 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 906 }; 907 908 /* 909 * Is this an error we can process/parse 910 */ 911 if (drv_stat & ATA_BUSY) { 912 drv_err = 0; /* Ignore the err bits, they're invalid */ 913 } 914 915 if (drv_err) { 916 /* Look for drv_err */ 917 for (i = 0; sense_table[i][0] != 0xFF; i++) { 918 /* Look for best matches first */ 919 if ((sense_table[i][0] & drv_err) == 920 sense_table[i][0]) { 921 *sk = sense_table[i][1]; 922 *asc = sense_table[i][2]; 923 *ascq = sense_table[i][3]; 924 goto translate_done; 925 } 926 } 927 } 928 929 /* 930 * Fall back to interpreting status bits. Note that if the drv_err 931 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 932 * is not descriptive enough. 933 */ 934 for (i = 0; stat_table[i][0] != 0xFF; i++) { 935 if (stat_table[i][0] & drv_stat) { 936 *sk = stat_table[i][1]; 937 *asc = stat_table[i][2]; 938 *ascq = stat_table[i][3]; 939 goto translate_done; 940 } 941 } 942 943 /* 944 * We need a sensible error return here, which is tricky, and one 945 * that won't cause people to do things like return a disk wrongly. 946 */ 947 *sk = ABORTED_COMMAND; 948 *asc = 0x00; 949 *ascq = 0x00; 950 951 translate_done: 952 if (verbose) 953 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 954 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 955 id, drv_stat, drv_err, *sk, *asc, *ascq); 956 return; 957} 958 959/* 960 * ata_gen_passthru_sense - Generate check condition sense block. 961 * @qc: Command that completed. 962 * 963 * This function is specific to the ATA descriptor format sense 964 * block specified for the ATA pass through commands. Regardless 965 * of whether the command errored or not, return a sense 966 * block. Copy all controller registers into the sense 967 * block. If there was no error, we get the request from an ATA 968 * passthrough command, so we use the following sense data: 969 * sk = RECOVERED ERROR 970 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 971 * 972 * 973 * LOCKING: 974 * None. 975 */ 976static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 977{ 978 struct scsi_cmnd *cmd = qc->scsicmd; 979 struct ata_taskfile *tf = &qc->result_tf; 980 unsigned char *sb = cmd->sense_buffer; 981 unsigned char *desc = sb + 8; 982 int verbose = qc->ap->ops->error_handler == NULL; 983 984 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 985 986 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 987 988 /* 989 * Use ata_to_sense_error() to map status register bits 990 * onto sense key, asc & ascq. 991 */ 992 if (qc->err_mask || 993 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 994 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 995 &sb[1], &sb[2], &sb[3], verbose); 996 sb[1] &= 0x0f; 997 } else { 998 sb[1] = RECOVERED_ERROR; 999 sb[2] = 0; 1000 sb[3] = 0x1D; 1001 } 1002 1003 /* 1004 * Sense data is current and format is descriptor. 1005 */ 1006 sb[0] = 0x72; 1007 1008 desc[0] = 0x09; 1009 1010 /* set length of additional sense data */ 1011 sb[7] = 14; 1012 desc[1] = 12; 1013 1014 /* 1015 * Copy registers into sense buffer. 1016 */ 1017 desc[2] = 0x00; 1018 desc[3] = tf->feature; /* == error reg */ 1019 desc[5] = tf->nsect; 1020 desc[7] = tf->lbal; 1021 desc[9] = tf->lbam; 1022 desc[11] = tf->lbah; 1023 desc[12] = tf->device; 1024 desc[13] = tf->command; /* == status reg */ 1025 1026 /* 1027 * Fill in Extend bit, and the high order bytes 1028 * if applicable. 1029 */ 1030 if (tf->flags & ATA_TFLAG_LBA48) { 1031 desc[2] |= 0x01; 1032 desc[4] = tf->hob_nsect; 1033 desc[6] = tf->hob_lbal; 1034 desc[8] = tf->hob_lbam; 1035 desc[10] = tf->hob_lbah; 1036 } 1037} 1038 1039/** 1040 * ata_gen_ata_sense - generate a SCSI fixed sense block 1041 * @qc: Command that we are erroring out 1042 * 1043 * Generate sense block for a failed ATA command @qc. Descriptor 1044 * format is used to accommodate LBA48 block address. 1045 * 1046 * LOCKING: 1047 * None. 1048 */ 1049static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1050{ 1051 struct ata_device *dev = qc->dev; 1052 struct scsi_cmnd *cmd = qc->scsicmd; 1053 struct ata_taskfile *tf = &qc->result_tf; 1054 unsigned char *sb = cmd->sense_buffer; 1055 unsigned char *desc = sb + 8; 1056 int verbose = qc->ap->ops->error_handler == NULL; 1057 u64 block; 1058 1059 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1060 1061 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1062 1063 /* sense data is current and format is descriptor */ 1064 sb[0] = 0x72; 1065 1066 /* Use ata_to_sense_error() to map status register bits 1067 * onto sense key, asc & ascq. 1068 */ 1069 if (qc->err_mask || 1070 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1071 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1072 &sb[1], &sb[2], &sb[3], verbose); 1073 sb[1] &= 0x0f; 1074 } 1075 1076 block = ata_tf_read_block(&qc->result_tf, dev); 1077 1078 /* information sense data descriptor */ 1079 sb[7] = 12; 1080 desc[0] = 0x00; 1081 desc[1] = 10; 1082 1083 desc[2] |= 0x80; /* valid */ 1084 desc[6] = block >> 40; 1085 desc[7] = block >> 32; 1086 desc[8] = block >> 24; 1087 desc[9] = block >> 16; 1088 desc[10] = block >> 8; 1089 desc[11] = block; 1090} 1091 1092static void ata_scsi_sdev_config(struct scsi_device *sdev) 1093{ 1094 sdev->use_10_for_rw = 1; 1095 sdev->use_10_for_ms = 1; 1096 sdev->no_report_opcodes = 1; 1097 sdev->no_write_same = 1; 1098 1099 /* Schedule policy is determined by ->qc_defer() callback and 1100 * it needs to see every deferred qc. Set dev_blocked to 1 to 1101 * prevent SCSI midlayer from automatically deferring 1102 * requests. 1103 */ 1104 sdev->max_device_blocked = 1; 1105} 1106 1107/** 1108 * atapi_drain_needed - Check whether data transfer may overflow 1109 * @rq: request to be checked 1110 * 1111 * ATAPI commands which transfer variable length data to host 1112 * might overflow due to application error or hardare bug. This 1113 * function checks whether overflow should be drained and ignored 1114 * for @request. 1115 * 1116 * LOCKING: 1117 * None. 1118 * 1119 * RETURNS: 1120 * 1 if ; otherwise, 0. 1121 */ 1122static int atapi_drain_needed(struct request *rq) 1123{ 1124 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1125 return 0; 1126 1127 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1128 return 0; 1129 1130 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1131} 1132 1133static int ata_scsi_dev_config(struct scsi_device *sdev, 1134 struct ata_device *dev) 1135{ 1136 struct request_queue *q = sdev->request_queue; 1137 1138 if (!ata_id_has_unload(dev->id)) 1139 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1140 1141 /* configure max sectors */ 1142 blk_queue_max_hw_sectors(q, dev->max_sectors); 1143 1144 if (dev->class == ATA_DEV_ATAPI) { 1145 void *buf; 1146 1147 sdev->sector_size = ATA_SECT_SIZE; 1148 1149 /* set DMA padding */ 1150 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1151 1152 /* configure draining */ 1153 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1154 if (!buf) { 1155 ata_dev_err(dev, "drain buffer allocation failed\n"); 1156 return -ENOMEM; 1157 } 1158 1159 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1160 } else { 1161 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1162 sdev->manage_start_stop = 1; 1163 } 1164 1165 /* 1166 * ata_pio_sectors() expects buffer for each sector to not cross 1167 * page boundary. Enforce it by requiring buffers to be sector 1168 * aligned, which works iff sector_size is not larger than 1169 * PAGE_SIZE. ATAPI devices also need the alignment as 1170 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1171 */ 1172 if (sdev->sector_size > PAGE_SIZE) 1173 ata_dev_warn(dev, 1174 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1175 sdev->sector_size); 1176 1177 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1178 1179 if (dev->flags & ATA_DFLAG_AN) 1180 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1181 1182 if (dev->flags & ATA_DFLAG_NCQ) { 1183 int depth; 1184 1185 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1186 depth = min(ATA_MAX_QUEUE - 1, depth); 1187 scsi_change_queue_depth(sdev, depth); 1188 } 1189 1190 blk_queue_flush_queueable(q, false); 1191 1192 dev->sdev = sdev; 1193 return 0; 1194} 1195 1196/** 1197 * ata_scsi_slave_config - Set SCSI device attributes 1198 * @sdev: SCSI device to examine 1199 * 1200 * This is called before we actually start reading 1201 * and writing to the device, to configure certain 1202 * SCSI mid-layer behaviors. 1203 * 1204 * LOCKING: 1205 * Defined by SCSI layer. We don't really care. 1206 */ 1207 1208int ata_scsi_slave_config(struct scsi_device *sdev) 1209{ 1210 struct ata_port *ap = ata_shost_to_port(sdev->host); 1211 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1212 int rc = 0; 1213 1214 ata_scsi_sdev_config(sdev); 1215 1216 if (dev) 1217 rc = ata_scsi_dev_config(sdev, dev); 1218 1219 return rc; 1220} 1221 1222/** 1223 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1224 * @sdev: SCSI device to be destroyed 1225 * 1226 * @sdev is about to be destroyed for hot/warm unplugging. If 1227 * this unplugging was initiated by libata as indicated by NULL 1228 * dev->sdev, this function doesn't have to do anything. 1229 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1230 * Clear dev->sdev, schedule the device for ATA detach and invoke 1231 * EH. 1232 * 1233 * LOCKING: 1234 * Defined by SCSI layer. We don't really care. 1235 */ 1236void ata_scsi_slave_destroy(struct scsi_device *sdev) 1237{ 1238 struct ata_port *ap = ata_shost_to_port(sdev->host); 1239 struct request_queue *q = sdev->request_queue; 1240 unsigned long flags; 1241 struct ata_device *dev; 1242 1243 if (!ap->ops->error_handler) 1244 return; 1245 1246 spin_lock_irqsave(ap->lock, flags); 1247 dev = __ata_scsi_find_dev(ap, sdev); 1248 if (dev && dev->sdev) { 1249 /* SCSI device already in CANCEL state, no need to offline it */ 1250 dev->sdev = NULL; 1251 dev->flags |= ATA_DFLAG_DETACH; 1252 ata_port_schedule_eh(ap); 1253 } 1254 spin_unlock_irqrestore(ap->lock, flags); 1255 1256 kfree(q->dma_drain_buffer); 1257 q->dma_drain_buffer = NULL; 1258 q->dma_drain_size = 0; 1259} 1260 1261/** 1262 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1263 * @ap: ATA port to which the device change the queue depth 1264 * @sdev: SCSI device to configure queue depth for 1265 * @queue_depth: new queue depth 1266 * 1267 * libsas and libata have different approaches for associating a sdev to 1268 * its ata_port. 1269 * 1270 */ 1271int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1272 int queue_depth) 1273{ 1274 struct ata_device *dev; 1275 unsigned long flags; 1276 1277 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1278 return sdev->queue_depth; 1279 1280 dev = ata_scsi_find_dev(ap, sdev); 1281 if (!dev || !ata_dev_enabled(dev)) 1282 return sdev->queue_depth; 1283 1284 /* NCQ enabled? */ 1285 spin_lock_irqsave(ap->lock, flags); 1286 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1287 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1288 dev->flags |= ATA_DFLAG_NCQ_OFF; 1289 queue_depth = 1; 1290 } 1291 spin_unlock_irqrestore(ap->lock, flags); 1292 1293 /* limit and apply queue depth */ 1294 queue_depth = min(queue_depth, sdev->host->can_queue); 1295 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1296 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1297 1298 if (sdev->queue_depth == queue_depth) 1299 return -EINVAL; 1300 1301 return scsi_change_queue_depth(sdev, queue_depth); 1302} 1303 1304/** 1305 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1306 * @sdev: SCSI device to configure queue depth for 1307 * @queue_depth: new queue depth 1308 * 1309 * This is libata standard hostt->change_queue_depth callback. 1310 * SCSI will call into this callback when user tries to set queue 1311 * depth via sysfs. 1312 * 1313 * LOCKING: 1314 * SCSI layer (we don't care) 1315 * 1316 * RETURNS: 1317 * Newly configured queue depth. 1318 */ 1319int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1320{ 1321 struct ata_port *ap = ata_shost_to_port(sdev->host); 1322 1323 return __ata_change_queue_depth(ap, sdev, queue_depth); 1324} 1325 1326/** 1327 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1328 * @qc: Storage for translated ATA taskfile 1329 * 1330 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1331 * (to start). Perhaps these commands should be preceded by 1332 * CHECK POWER MODE to see what power mode the device is already in. 1333 * [See SAT revision 5 at www.t10.org] 1334 * 1335 * LOCKING: 1336 * spin_lock_irqsave(host lock) 1337 * 1338 * RETURNS: 1339 * Zero on success, non-zero on error. 1340 */ 1341static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1342{ 1343 struct scsi_cmnd *scmd = qc->scsicmd; 1344 struct ata_taskfile *tf = &qc->tf; 1345 const u8 *cdb = scmd->cmnd; 1346 1347 if (scmd->cmd_len < 5) 1348 goto invalid_fld; 1349 1350 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1351 tf->protocol = ATA_PROT_NODATA; 1352 if (cdb[1] & 0x1) { 1353 ; /* ignore IMMED bit, violates sat-r05 */ 1354 } 1355 if (cdb[4] & 0x2) 1356 goto invalid_fld; /* LOEJ bit set not supported */ 1357 if (((cdb[4] >> 4) & 0xf) != 0) 1358 goto invalid_fld; /* power conditions not supported */ 1359 1360 if (cdb[4] & 0x1) { 1361 tf->nsect = 1; /* 1 sector, lba=0 */ 1362 1363 if (qc->dev->flags & ATA_DFLAG_LBA) { 1364 tf->flags |= ATA_TFLAG_LBA; 1365 1366 tf->lbah = 0x0; 1367 tf->lbam = 0x0; 1368 tf->lbal = 0x0; 1369 tf->device |= ATA_LBA; 1370 } else { 1371 /* CHS */ 1372 tf->lbal = 0x1; /* sect */ 1373 tf->lbam = 0x0; /* cyl low */ 1374 tf->lbah = 0x0; /* cyl high */ 1375 } 1376 1377 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1378 } else { 1379 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1380 * or S5) causing some drives to spin up and down again. 1381 */ 1382 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1383 system_state == SYSTEM_POWER_OFF) 1384 goto skip; 1385 1386 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1387 system_entering_hibernation()) 1388 goto skip; 1389 1390 /* Issue ATA STANDBY IMMEDIATE command */ 1391 tf->command = ATA_CMD_STANDBYNOW1; 1392 } 1393 1394 /* 1395 * Standby and Idle condition timers could be implemented but that 1396 * would require libata to implement the Power condition mode page 1397 * and allow the user to change it. Changing mode pages requires 1398 * MODE SELECT to be implemented. 1399 */ 1400 1401 return 0; 1402 1403 invalid_fld: 1404 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1405 /* "Invalid field in cbd" */ 1406 return 1; 1407 skip: 1408 scmd->result = SAM_STAT_GOOD; 1409 return 1; 1410} 1411 1412 1413/** 1414 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1415 * @qc: Storage for translated ATA taskfile 1416 * 1417 * Sets up an ATA taskfile to issue FLUSH CACHE or 1418 * FLUSH CACHE EXT. 1419 * 1420 * LOCKING: 1421 * spin_lock_irqsave(host lock) 1422 * 1423 * RETURNS: 1424 * Zero on success, non-zero on error. 1425 */ 1426static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1427{ 1428 struct ata_taskfile *tf = &qc->tf; 1429 1430 tf->flags |= ATA_TFLAG_DEVICE; 1431 tf->protocol = ATA_PROT_NODATA; 1432 1433 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1434 tf->command = ATA_CMD_FLUSH_EXT; 1435 else 1436 tf->command = ATA_CMD_FLUSH; 1437 1438 /* flush is critical for IO integrity, consider it an IO command */ 1439 qc->flags |= ATA_QCFLAG_IO; 1440 1441 return 0; 1442} 1443 1444/** 1445 * scsi_6_lba_len - Get LBA and transfer length 1446 * @cdb: SCSI command to translate 1447 * 1448 * Calculate LBA and transfer length for 6-byte commands. 1449 * 1450 * RETURNS: 1451 * @plba: the LBA 1452 * @plen: the transfer length 1453 */ 1454static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1455{ 1456 u64 lba = 0; 1457 u32 len; 1458 1459 VPRINTK("six-byte command\n"); 1460 1461 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1462 lba |= ((u64)cdb[2]) << 8; 1463 lba |= ((u64)cdb[3]); 1464 1465 len = cdb[4]; 1466 1467 *plba = lba; 1468 *plen = len; 1469} 1470 1471/** 1472 * scsi_10_lba_len - Get LBA and transfer length 1473 * @cdb: SCSI command to translate 1474 * 1475 * Calculate LBA and transfer length for 10-byte commands. 1476 * 1477 * RETURNS: 1478 * @plba: the LBA 1479 * @plen: the transfer length 1480 */ 1481static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1482{ 1483 u64 lba = 0; 1484 u32 len = 0; 1485 1486 VPRINTK("ten-byte command\n"); 1487 1488 lba |= ((u64)cdb[2]) << 24; 1489 lba |= ((u64)cdb[3]) << 16; 1490 lba |= ((u64)cdb[4]) << 8; 1491 lba |= ((u64)cdb[5]); 1492 1493 len |= ((u32)cdb[7]) << 8; 1494 len |= ((u32)cdb[8]); 1495 1496 *plba = lba; 1497 *plen = len; 1498} 1499 1500/** 1501 * scsi_16_lba_len - Get LBA and transfer length 1502 * @cdb: SCSI command to translate 1503 * 1504 * Calculate LBA and transfer length for 16-byte commands. 1505 * 1506 * RETURNS: 1507 * @plba: the LBA 1508 * @plen: the transfer length 1509 */ 1510static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1511{ 1512 u64 lba = 0; 1513 u32 len = 0; 1514 1515 VPRINTK("sixteen-byte command\n"); 1516 1517 lba |= ((u64)cdb[2]) << 56; 1518 lba |= ((u64)cdb[3]) << 48; 1519 lba |= ((u64)cdb[4]) << 40; 1520 lba |= ((u64)cdb[5]) << 32; 1521 lba |= ((u64)cdb[6]) << 24; 1522 lba |= ((u64)cdb[7]) << 16; 1523 lba |= ((u64)cdb[8]) << 8; 1524 lba |= ((u64)cdb[9]); 1525 1526 len |= ((u32)cdb[10]) << 24; 1527 len |= ((u32)cdb[11]) << 16; 1528 len |= ((u32)cdb[12]) << 8; 1529 len |= ((u32)cdb[13]); 1530 1531 *plba = lba; 1532 *plen = len; 1533} 1534 1535/** 1536 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1537 * @qc: Storage for translated ATA taskfile 1538 * 1539 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1540 * 1541 * LOCKING: 1542 * spin_lock_irqsave(host lock) 1543 * 1544 * RETURNS: 1545 * Zero on success, non-zero on error. 1546 */ 1547static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1548{ 1549 struct scsi_cmnd *scmd = qc->scsicmd; 1550 struct ata_taskfile *tf = &qc->tf; 1551 struct ata_device *dev = qc->dev; 1552 u64 dev_sectors = qc->dev->n_sectors; 1553 const u8 *cdb = scmd->cmnd; 1554 u64 block; 1555 u32 n_block; 1556 1557 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1558 tf->protocol = ATA_PROT_NODATA; 1559 1560 if (cdb[0] == VERIFY) { 1561 if (scmd->cmd_len < 10) 1562 goto invalid_fld; 1563 scsi_10_lba_len(cdb, &block, &n_block); 1564 } else if (cdb[0] == VERIFY_16) { 1565 if (scmd->cmd_len < 16) 1566 goto invalid_fld; 1567 scsi_16_lba_len(cdb, &block, &n_block); 1568 } else 1569 goto invalid_fld; 1570 1571 if (!n_block) 1572 goto nothing_to_do; 1573 if (block >= dev_sectors) 1574 goto out_of_range; 1575 if ((block + n_block) > dev_sectors) 1576 goto out_of_range; 1577 1578 if (dev->flags & ATA_DFLAG_LBA) { 1579 tf->flags |= ATA_TFLAG_LBA; 1580 1581 if (lba_28_ok(block, n_block)) { 1582 /* use LBA28 */ 1583 tf->command = ATA_CMD_VERIFY; 1584 tf->device |= (block >> 24) & 0xf; 1585 } else if (lba_48_ok(block, n_block)) { 1586 if (!(dev->flags & ATA_DFLAG_LBA48)) 1587 goto out_of_range; 1588 1589 /* use LBA48 */ 1590 tf->flags |= ATA_TFLAG_LBA48; 1591 tf->command = ATA_CMD_VERIFY_EXT; 1592 1593 tf->hob_nsect = (n_block >> 8) & 0xff; 1594 1595 tf->hob_lbah = (block >> 40) & 0xff; 1596 tf->hob_lbam = (block >> 32) & 0xff; 1597 tf->hob_lbal = (block >> 24) & 0xff; 1598 } else 1599 /* request too large even for LBA48 */ 1600 goto out_of_range; 1601 1602 tf->nsect = n_block & 0xff; 1603 1604 tf->lbah = (block >> 16) & 0xff; 1605 tf->lbam = (block >> 8) & 0xff; 1606 tf->lbal = block & 0xff; 1607 1608 tf->device |= ATA_LBA; 1609 } else { 1610 /* CHS */ 1611 u32 sect, head, cyl, track; 1612 1613 if (!lba_28_ok(block, n_block)) 1614 goto out_of_range; 1615 1616 /* Convert LBA to CHS */ 1617 track = (u32)block / dev->sectors; 1618 cyl = track / dev->heads; 1619 head = track % dev->heads; 1620 sect = (u32)block % dev->sectors + 1; 1621 1622 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1623 (u32)block, track, cyl, head, sect); 1624 1625 /* Check whether the converted CHS can fit. 1626 Cylinder: 0-65535 1627 Head: 0-15 1628 Sector: 1-255*/ 1629 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1630 goto out_of_range; 1631 1632 tf->command = ATA_CMD_VERIFY; 1633 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1634 tf->lbal = sect; 1635 tf->lbam = cyl; 1636 tf->lbah = cyl >> 8; 1637 tf->device |= head; 1638 } 1639 1640 return 0; 1641 1642invalid_fld: 1643 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1644 /* "Invalid field in cbd" */ 1645 return 1; 1646 1647out_of_range: 1648 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1649 /* "Logical Block Address out of range" */ 1650 return 1; 1651 1652nothing_to_do: 1653 scmd->result = SAM_STAT_GOOD; 1654 return 1; 1655} 1656 1657/** 1658 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1659 * @qc: Storage for translated ATA taskfile 1660 * 1661 * Converts any of six SCSI read/write commands into the 1662 * ATA counterpart, including starting sector (LBA), 1663 * sector count, and taking into account the device's LBA48 1664 * support. 1665 * 1666 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1667 * %WRITE_16 are currently supported. 1668 * 1669 * LOCKING: 1670 * spin_lock_irqsave(host lock) 1671 * 1672 * RETURNS: 1673 * Zero on success, non-zero on error. 1674 */ 1675static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1676{ 1677 struct scsi_cmnd *scmd = qc->scsicmd; 1678 const u8 *cdb = scmd->cmnd; 1679 unsigned int tf_flags = 0; 1680 u64 block; 1681 u32 n_block; 1682 int rc; 1683 1684 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1685 tf_flags |= ATA_TFLAG_WRITE; 1686 1687 /* Calculate the SCSI LBA, transfer length and FUA. */ 1688 switch (cdb[0]) { 1689 case READ_10: 1690 case WRITE_10: 1691 if (unlikely(scmd->cmd_len < 10)) 1692 goto invalid_fld; 1693 scsi_10_lba_len(cdb, &block, &n_block); 1694 if (cdb[1] & (1 << 3)) 1695 tf_flags |= ATA_TFLAG_FUA; 1696 break; 1697 case READ_6: 1698 case WRITE_6: 1699 if (unlikely(scmd->cmd_len < 6)) 1700 goto invalid_fld; 1701 scsi_6_lba_len(cdb, &block, &n_block); 1702 1703 /* for 6-byte r/w commands, transfer length 0 1704 * means 256 blocks of data, not 0 block. 1705 */ 1706 if (!n_block) 1707 n_block = 256; 1708 break; 1709 case READ_16: 1710 case WRITE_16: 1711 if (unlikely(scmd->cmd_len < 16)) 1712 goto invalid_fld; 1713 scsi_16_lba_len(cdb, &block, &n_block); 1714 if (cdb[1] & (1 << 3)) 1715 tf_flags |= ATA_TFLAG_FUA; 1716 break; 1717 default: 1718 DPRINTK("no-byte command\n"); 1719 goto invalid_fld; 1720 } 1721 1722 /* Check and compose ATA command */ 1723 if (!n_block) 1724 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1725 * length 0 means transfer 0 block of data. 1726 * However, for ATA R/W commands, sector count 0 means 1727 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1728 * 1729 * WARNING: one or two older ATA drives treat 0 as 0... 1730 */ 1731 goto nothing_to_do; 1732 1733 qc->flags |= ATA_QCFLAG_IO; 1734 qc->nbytes = n_block * scmd->device->sector_size; 1735 1736 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1737 qc->tag); 1738 if (likely(rc == 0)) 1739 return 0; 1740 1741 if (rc == -ERANGE) 1742 goto out_of_range; 1743 /* treat all other errors as -EINVAL, fall through */ 1744invalid_fld: 1745 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1746 /* "Invalid field in cbd" */ 1747 return 1; 1748 1749out_of_range: 1750 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1751 /* "Logical Block Address out of range" */ 1752 return 1; 1753 1754nothing_to_do: 1755 scmd->result = SAM_STAT_GOOD; 1756 return 1; 1757} 1758 1759static void ata_qc_done(struct ata_queued_cmd *qc) 1760{ 1761 struct scsi_cmnd *cmd = qc->scsicmd; 1762 void (*done)(struct scsi_cmnd *) = qc->scsidone; 1763 1764 ata_qc_free(qc); 1765 done(cmd); 1766} 1767 1768static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1769{ 1770 struct ata_port *ap = qc->ap; 1771 struct scsi_cmnd *cmd = qc->scsicmd; 1772 u8 *cdb = cmd->cmnd; 1773 int need_sense = (qc->err_mask != 0); 1774 1775 /* For ATA pass thru (SAT) commands, generate a sense block if 1776 * user mandated it or if there's an error. Note that if we 1777 * generate because the user forced us to [CK_COND =1], a check 1778 * condition is generated and the ATA register values are returned 1779 * whether the command completed successfully or not. If there 1780 * was no error, we use the following sense data: 1781 * sk = RECOVERED ERROR 1782 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1783 */ 1784 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1785 ((cdb[2] & 0x20) || need_sense)) 1786 ata_gen_passthru_sense(qc); 1787 else if (need_sense) 1788 ata_gen_ata_sense(qc); 1789 else 1790 cmd->result = SAM_STAT_GOOD; 1791 1792 if (need_sense && !ap->ops->error_handler) 1793 ata_dump_status(ap->print_id, &qc->result_tf); 1794 1795 ata_qc_done(qc); 1796} 1797 1798/** 1799 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1800 * @dev: ATA device to which the command is addressed 1801 * @cmd: SCSI command to execute 1802 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1803 * 1804 * Our ->queuecommand() function has decided that the SCSI 1805 * command issued can be directly translated into an ATA 1806 * command, rather than handled internally. 1807 * 1808 * This function sets up an ata_queued_cmd structure for the 1809 * SCSI command, and sends that ata_queued_cmd to the hardware. 1810 * 1811 * The xlat_func argument (actor) returns 0 if ready to execute 1812 * ATA command, else 1 to finish translation. If 1 is returned 1813 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1814 * to be set reflecting an error condition or clean (early) 1815 * termination. 1816 * 1817 * LOCKING: 1818 * spin_lock_irqsave(host lock) 1819 * 1820 * RETURNS: 1821 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1822 * needs to be deferred. 1823 */ 1824static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1825 ata_xlat_func_t xlat_func) 1826{ 1827 struct ata_port *ap = dev->link->ap; 1828 struct ata_queued_cmd *qc; 1829 int rc; 1830 1831 VPRINTK("ENTER\n"); 1832 1833 qc = ata_scsi_qc_new(dev, cmd); 1834 if (!qc) 1835 goto err_mem; 1836 1837 /* data is present; dma-map it */ 1838 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1839 cmd->sc_data_direction == DMA_TO_DEVICE) { 1840 if (unlikely(scsi_bufflen(cmd) < 1)) { 1841 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1842 goto err_did; 1843 } 1844 1845 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1846 1847 qc->dma_dir = cmd->sc_data_direction; 1848 } 1849 1850 qc->complete_fn = ata_scsi_qc_complete; 1851 1852 if (xlat_func(qc)) 1853 goto early_finish; 1854 1855 if (ap->ops->qc_defer) { 1856 if ((rc = ap->ops->qc_defer(qc))) 1857 goto defer; 1858 } 1859 1860 /* select device, send command to hardware */ 1861 ata_qc_issue(qc); 1862 1863 VPRINTK("EXIT\n"); 1864 return 0; 1865 1866early_finish: 1867 ata_qc_free(qc); 1868 cmd->scsi_done(cmd); 1869 DPRINTK("EXIT - early finish (good or error)\n"); 1870 return 0; 1871 1872err_did: 1873 ata_qc_free(qc); 1874 cmd->result = (DID_ERROR << 16); 1875 cmd->scsi_done(cmd); 1876err_mem: 1877 DPRINTK("EXIT - internal\n"); 1878 return 0; 1879 1880defer: 1881 ata_qc_free(qc); 1882 DPRINTK("EXIT - defer\n"); 1883 if (rc == ATA_DEFER_LINK) 1884 return SCSI_MLQUEUE_DEVICE_BUSY; 1885 else 1886 return SCSI_MLQUEUE_HOST_BUSY; 1887} 1888 1889/** 1890 * ata_scsi_rbuf_get - Map response buffer. 1891 * @cmd: SCSI command containing buffer to be mapped. 1892 * @flags: unsigned long variable to store irq enable status 1893 * @copy_in: copy in from user buffer 1894 * 1895 * Prepare buffer for simulated SCSI commands. 1896 * 1897 * LOCKING: 1898 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1899 * 1900 * RETURNS: 1901 * Pointer to response buffer. 1902 */ 1903static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1904 unsigned long *flags) 1905{ 1906 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1907 1908 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1909 if (copy_in) 1910 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1911 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1912 return ata_scsi_rbuf; 1913} 1914 1915/** 1916 * ata_scsi_rbuf_put - Unmap response buffer. 1917 * @cmd: SCSI command containing buffer to be unmapped. 1918 * @copy_out: copy out result 1919 * @flags: @flags passed to ata_scsi_rbuf_get() 1920 * 1921 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1922 * @copy_back is true. 1923 * 1924 * LOCKING: 1925 * Unlocks ata_scsi_rbuf_lock. 1926 */ 1927static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1928 unsigned long *flags) 1929{ 1930 if (copy_out) 1931 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1932 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1933 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1934} 1935 1936/** 1937 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1938 * @args: device IDENTIFY data / SCSI command of interest. 1939 * @actor: Callback hook for desired SCSI command simulator 1940 * 1941 * Takes care of the hard work of simulating a SCSI command... 1942 * Mapping the response buffer, calling the command's handler, 1943 * and handling the handler's return value. This return value 1944 * indicates whether the handler wishes the SCSI command to be 1945 * completed successfully (0), or not (in which case cmd->result 1946 * and sense buffer are assumed to be set). 1947 * 1948 * LOCKING: 1949 * spin_lock_irqsave(host lock) 1950 */ 1951static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1952 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1953{ 1954 u8 *rbuf; 1955 unsigned int rc; 1956 struct scsi_cmnd *cmd = args->cmd; 1957 unsigned long flags; 1958 1959 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1960 rc = actor(args, rbuf); 1961 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1962 1963 if (rc == 0) 1964 cmd->result = SAM_STAT_GOOD; 1965 args->done(cmd); 1966} 1967 1968/** 1969 * ata_scsiop_inq_std - Simulate INQUIRY command 1970 * @args: device IDENTIFY data / SCSI command of interest. 1971 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1972 * 1973 * Returns standard device identification data associated 1974 * with non-VPD INQUIRY command output. 1975 * 1976 * LOCKING: 1977 * spin_lock_irqsave(host lock) 1978 */ 1979static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1980{ 1981 const u8 versions[] = { 1982 0x00, 1983 0x60, /* SAM-3 (no version claimed) */ 1984 1985 0x03, 1986 0x20, /* SBC-2 (no version claimed) */ 1987 1988 0x02, 1989 0x60 /* SPC-3 (no version claimed) */ 1990 }; 1991 const u8 versions_zbc[] = { 1992 0x00, 1993 0xA0, /* SAM-5 (no version claimed) */ 1994 1995 0x04, 1996 0xC0, /* SBC-3 (no version claimed) */ 1997 1998 0x04, 1999 0x60, /* SPC-4 (no version claimed) */ 2000 2001 0x60, 2002 0x20, /* ZBC (no version claimed) */ 2003 }; 2004 2005 u8 hdr[] = { 2006 TYPE_DISK, 2007 0, 2008 0x5, /* claim SPC-3 version compatibility */ 2009 2, 2010 95 - 4 2011 }; 2012 2013 VPRINTK("ENTER\n"); 2014 2015 /* set scsi removable (RMB) bit per ata bit, or if the 2016 * AHCI port says it's external (Hotplug-capable, eSATA). 2017 */ 2018 if (ata_id_removable(args->id) || 2019 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) 2020 hdr[1] |= (1 << 7); 2021 2022 if (args->dev->class == ATA_DEV_ZAC) { 2023 hdr[0] = TYPE_ZBC; 2024 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */ 2025 } 2026 2027 memcpy(rbuf, hdr, sizeof(hdr)); 2028 memcpy(&rbuf[8], "ATA ", 8); 2029 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 2030 2031 /* From SAT, use last 2 words from fw rev unless they are spaces */ 2032 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); 2033 if (strncmp(&rbuf[32], " ", 4) == 0) 2034 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2035 2036 if (rbuf[32] == 0 || rbuf[32] == ' ') 2037 memcpy(&rbuf[32], "n/a ", 4); 2038 2039 if (args->dev->class == ATA_DEV_ZAC) 2040 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); 2041 else 2042 memcpy(rbuf + 58, versions, sizeof(versions)); 2043 2044 return 0; 2045} 2046 2047/** 2048 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 2049 * @args: device IDENTIFY data / SCSI command of interest. 2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2051 * 2052 * Returns list of inquiry VPD pages available. 2053 * 2054 * LOCKING: 2055 * spin_lock_irqsave(host lock) 2056 */ 2057static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2058{ 2059 const u8 pages[] = { 2060 0x00, /* page 0x00, this page */ 2061 0x80, /* page 0x80, unit serial no page */ 2062 0x83, /* page 0x83, device ident page */ 2063 0x89, /* page 0x89, ata info page */ 2064 0xb0, /* page 0xb0, block limits page */ 2065 0xb1, /* page 0xb1, block device characteristics page */ 2066 0xb2, /* page 0xb2, thin provisioning page */ 2067 }; 2068 2069 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2070 memcpy(rbuf + 4, pages, sizeof(pages)); 2071 return 0; 2072} 2073 2074/** 2075 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2076 * @args: device IDENTIFY data / SCSI command of interest. 2077 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2078 * 2079 * Returns ATA device serial number. 2080 * 2081 * LOCKING: 2082 * spin_lock_irqsave(host lock) 2083 */ 2084static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2085{ 2086 const u8 hdr[] = { 2087 0, 2088 0x80, /* this page code */ 2089 0, 2090 ATA_ID_SERNO_LEN, /* page len */ 2091 }; 2092 2093 memcpy(rbuf, hdr, sizeof(hdr)); 2094 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2095 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2096 return 0; 2097} 2098 2099/** 2100 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2101 * @args: device IDENTIFY data / SCSI command of interest. 2102 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2103 * 2104 * Yields two logical unit device identification designators: 2105 * - vendor specific ASCII containing the ATA serial number 2106 * - SAT defined "t10 vendor id based" containing ASCII vendor 2107 * name ("ATA "), model and serial numbers. 2108 * 2109 * LOCKING: 2110 * spin_lock_irqsave(host lock) 2111 */ 2112static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2113{ 2114 const int sat_model_serial_desc_len = 68; 2115 int num; 2116 2117 rbuf[1] = 0x83; /* this page code */ 2118 num = 4; 2119 2120 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2121 rbuf[num + 0] = 2; 2122 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2123 num += 4; 2124 ata_id_string(args->id, (unsigned char *) rbuf + num, 2125 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2126 num += ATA_ID_SERNO_LEN; 2127 2128 /* SAT defined lu model and serial numbers descriptor */ 2129 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2130 rbuf[num + 0] = 2; 2131 rbuf[num + 1] = 1; 2132 rbuf[num + 3] = sat_model_serial_desc_len; 2133 num += 4; 2134 memcpy(rbuf + num, "ATA ", 8); 2135 num += 8; 2136 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2137 ATA_ID_PROD_LEN); 2138 num += ATA_ID_PROD_LEN; 2139 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2140 ATA_ID_SERNO_LEN); 2141 num += ATA_ID_SERNO_LEN; 2142 2143 if (ata_id_has_wwn(args->id)) { 2144 /* SAT defined lu world wide name */ 2145 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2146 rbuf[num + 0] = 1; 2147 rbuf[num + 1] = 3; 2148 rbuf[num + 3] = ATA_ID_WWN_LEN; 2149 num += 4; 2150 ata_id_string(args->id, (unsigned char *) rbuf + num, 2151 ATA_ID_WWN, ATA_ID_WWN_LEN); 2152 num += ATA_ID_WWN_LEN; 2153 } 2154 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2155 return 0; 2156} 2157 2158/** 2159 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2160 * @args: device IDENTIFY data / SCSI command of interest. 2161 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2162 * 2163 * Yields SAT-specified ATA VPD page. 2164 * 2165 * LOCKING: 2166 * spin_lock_irqsave(host lock) 2167 */ 2168static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2169{ 2170 struct ata_taskfile tf; 2171 2172 memset(&tf, 0, sizeof(tf)); 2173 2174 rbuf[1] = 0x89; /* our page code */ 2175 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2176 rbuf[3] = (0x238 & 0xff); 2177 2178 memcpy(&rbuf[8], "linux ", 8); 2179 memcpy(&rbuf[16], "libata ", 16); 2180 memcpy(&rbuf[32], DRV_VERSION, 4); 2181 2182 /* we don't store the ATA device signature, so we fake it */ 2183 2184 tf.command = ATA_DRDY; /* really, this is Status reg */ 2185 tf.lbal = 0x1; 2186 tf.nsect = 0x1; 2187 2188 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2189 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2190 2191 rbuf[56] = ATA_CMD_ID_ATA; 2192 2193 memcpy(&rbuf[60], &args->id[0], 512); 2194 return 0; 2195} 2196 2197static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2198{ 2199 u16 min_io_sectors; 2200 2201 rbuf[1] = 0xb0; 2202 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2203 2204 /* 2205 * Optimal transfer length granularity. 2206 * 2207 * This is always one physical block, but for disks with a smaller 2208 * logical than physical sector size we need to figure out what the 2209 * latter is. 2210 */ 2211 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2212 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2213 2214 /* 2215 * Optimal unmap granularity. 2216 * 2217 * The ATA spec doesn't even know about a granularity or alignment 2218 * for the TRIM command. We can leave away most of the unmap related 2219 * VPD page entries, but we have specifify a granularity to signal 2220 * that we support some form of unmap - in thise case via WRITE SAME 2221 * with the unmap bit set. 2222 */ 2223 if (ata_id_has_trim(args->id)) { 2224 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2225 put_unaligned_be32(1, &rbuf[28]); 2226 } 2227 2228 return 0; 2229} 2230 2231static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2232{ 2233 int form_factor = ata_id_form_factor(args->id); 2234 int media_rotation_rate = ata_id_rotation_rate(args->id); 2235 2236 rbuf[1] = 0xb1; 2237 rbuf[3] = 0x3c; 2238 rbuf[4] = media_rotation_rate >> 8; 2239 rbuf[5] = media_rotation_rate; 2240 rbuf[7] = form_factor; 2241 2242 return 0; 2243} 2244 2245static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2246{ 2247 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2248 rbuf[1] = 0xb2; 2249 rbuf[3] = 0x4; 2250 rbuf[5] = 1 << 6; /* TPWS */ 2251 2252 return 0; 2253} 2254 2255/** 2256 * ata_scsiop_noop - Command handler that simply returns success. 2257 * @args: device IDENTIFY data / SCSI command of interest. 2258 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2259 * 2260 * No operation. Simply returns success to caller, to indicate 2261 * that the caller should successfully complete this SCSI command. 2262 * 2263 * LOCKING: 2264 * spin_lock_irqsave(host lock) 2265 */ 2266static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2267{ 2268 VPRINTK("ENTER\n"); 2269 return 0; 2270} 2271 2272/** 2273 * modecpy - Prepare response for MODE SENSE 2274 * @dest: output buffer 2275 * @src: data being copied 2276 * @n: length of mode page 2277 * @changeable: whether changeable parameters are requested 2278 * 2279 * Generate a generic MODE SENSE page for either current or changeable 2280 * parameters. 2281 * 2282 * LOCKING: 2283 * None. 2284 */ 2285static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2286{ 2287 if (changeable) { 2288 memcpy(dest, src, 2); 2289 memset(dest + 2, 0, n - 2); 2290 } else { 2291 memcpy(dest, src, n); 2292 } 2293} 2294 2295/** 2296 * ata_msense_caching - Simulate MODE SENSE caching info page 2297 * @id: device IDENTIFY data 2298 * @buf: output buffer 2299 * @changeable: whether changeable parameters are requested 2300 * 2301 * Generate a caching info page, which conditionally indicates 2302 * write caching to the SCSI layer, depending on device 2303 * capabilities. 2304 * 2305 * LOCKING: 2306 * None. 2307 */ 2308static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2309{ 2310 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2311 if (changeable || ata_id_wcache_enabled(id)) 2312 buf[2] |= (1 << 2); /* write cache enable */ 2313 if (!changeable && !ata_id_rahead_enabled(id)) 2314 buf[12] |= (1 << 5); /* disable read ahead */ 2315 return sizeof(def_cache_mpage); 2316} 2317 2318/** 2319 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2320 * @buf: output buffer 2321 * @changeable: whether changeable parameters are requested 2322 * 2323 * Generate a generic MODE SENSE control mode page. 2324 * 2325 * LOCKING: 2326 * None. 2327 */ 2328static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2329{ 2330 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2331 return sizeof(def_control_mpage); 2332} 2333 2334/** 2335 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2336 * @buf: output buffer 2337 * @changeable: whether changeable parameters are requested 2338 * 2339 * Generate a generic MODE SENSE r/w error recovery page. 2340 * 2341 * LOCKING: 2342 * None. 2343 */ 2344static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2345{ 2346 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2347 changeable); 2348 return sizeof(def_rw_recovery_mpage); 2349} 2350 2351/* 2352 * We can turn this into a real blacklist if it's needed, for now just 2353 * blacklist any Maxtor BANC1G10 revision firmware 2354 */ 2355static int ata_dev_supports_fua(u16 *id) 2356{ 2357 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2358 2359 if (!libata_fua) 2360 return 0; 2361 if (!ata_id_has_fua(id)) 2362 return 0; 2363 2364 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2365 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2366 2367 if (strcmp(model, "Maxtor")) 2368 return 1; 2369 if (strcmp(fw, "BANC1G10")) 2370 return 1; 2371 2372 return 0; /* blacklisted */ 2373} 2374 2375/** 2376 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2377 * @args: device IDENTIFY data / SCSI command of interest. 2378 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2379 * 2380 * Simulate MODE SENSE commands. Assume this is invoked for direct 2381 * access devices (e.g. disks) only. There should be no block 2382 * descriptor for other device types. 2383 * 2384 * LOCKING: 2385 * spin_lock_irqsave(host lock) 2386 */ 2387static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2388{ 2389 struct ata_device *dev = args->dev; 2390 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2391 const u8 sat_blk_desc[] = { 2392 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2393 0, 2394 0, 0x2, 0x0 /* block length: 512 bytes */ 2395 }; 2396 u8 pg, spg; 2397 unsigned int ebd, page_control, six_byte; 2398 u8 dpofua; 2399 2400 VPRINTK("ENTER\n"); 2401 2402 six_byte = (scsicmd[0] == MODE_SENSE); 2403 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2404 /* 2405 * LLBA bit in msense(10) ignored (compliant) 2406 */ 2407 2408 page_control = scsicmd[2] >> 6; 2409 switch (page_control) { 2410 case 0: /* current */ 2411 case 1: /* changeable */ 2412 case 2: /* defaults */ 2413 break; /* supported */ 2414 case 3: /* saved */ 2415 goto saving_not_supp; 2416 default: 2417 goto invalid_fld; 2418 } 2419 2420 if (six_byte) 2421 p += 4 + (ebd ? 8 : 0); 2422 else 2423 p += 8 + (ebd ? 8 : 0); 2424 2425 pg = scsicmd[2] & 0x3f; 2426 spg = scsicmd[3]; 2427 /* 2428 * No mode subpages supported (yet) but asking for _all_ 2429 * subpages may be valid 2430 */ 2431 if (spg && (spg != ALL_SUB_MPAGES)) 2432 goto invalid_fld; 2433 2434 switch(pg) { 2435 case RW_RECOVERY_MPAGE: 2436 p += ata_msense_rw_recovery(p, page_control == 1); 2437 break; 2438 2439 case CACHE_MPAGE: 2440 p += ata_msense_caching(args->id, p, page_control == 1); 2441 break; 2442 2443 case CONTROL_MPAGE: 2444 p += ata_msense_ctl_mode(p, page_control == 1); 2445 break; 2446 2447 case ALL_MPAGES: 2448 p += ata_msense_rw_recovery(p, page_control == 1); 2449 p += ata_msense_caching(args->id, p, page_control == 1); 2450 p += ata_msense_ctl_mode(p, page_control == 1); 2451 break; 2452 2453 default: /* invalid page code */ 2454 goto invalid_fld; 2455 } 2456 2457 dpofua = 0; 2458 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2459 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2460 dpofua = 1 << 4; 2461 2462 if (six_byte) { 2463 rbuf[0] = p - rbuf - 1; 2464 rbuf[2] |= dpofua; 2465 if (ebd) { 2466 rbuf[3] = sizeof(sat_blk_desc); 2467 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2468 } 2469 } else { 2470 unsigned int output_len = p - rbuf - 2; 2471 2472 rbuf[0] = output_len >> 8; 2473 rbuf[1] = output_len; 2474 rbuf[3] |= dpofua; 2475 if (ebd) { 2476 rbuf[7] = sizeof(sat_blk_desc); 2477 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2478 } 2479 } 2480 return 0; 2481 2482invalid_fld: 2483 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2484 /* "Invalid field in cbd" */ 2485 return 1; 2486 2487saving_not_supp: 2488 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2489 /* "Saving parameters not supported" */ 2490 return 1; 2491} 2492 2493/** 2494 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2495 * @args: device IDENTIFY data / SCSI command of interest. 2496 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2497 * 2498 * Simulate READ CAPACITY commands. 2499 * 2500 * LOCKING: 2501 * None. 2502 */ 2503static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2504{ 2505 struct ata_device *dev = args->dev; 2506 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2507 u32 sector_size; /* physical sector size in bytes */ 2508 u8 log2_per_phys; 2509 u16 lowest_aligned; 2510 2511 sector_size = ata_id_logical_sector_size(dev->id); 2512 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2513 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2514 2515 VPRINTK("ENTER\n"); 2516 2517 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2518 if (last_lba >= 0xffffffffULL) 2519 last_lba = 0xffffffff; 2520 2521 /* sector count, 32-bit */ 2522 rbuf[0] = last_lba >> (8 * 3); 2523 rbuf[1] = last_lba >> (8 * 2); 2524 rbuf[2] = last_lba >> (8 * 1); 2525 rbuf[3] = last_lba; 2526 2527 /* sector size */ 2528 rbuf[4] = sector_size >> (8 * 3); 2529 rbuf[5] = sector_size >> (8 * 2); 2530 rbuf[6] = sector_size >> (8 * 1); 2531 rbuf[7] = sector_size; 2532 } else { 2533 /* sector count, 64-bit */ 2534 rbuf[0] = last_lba >> (8 * 7); 2535 rbuf[1] = last_lba >> (8 * 6); 2536 rbuf[2] = last_lba >> (8 * 5); 2537 rbuf[3] = last_lba >> (8 * 4); 2538 rbuf[4] = last_lba >> (8 * 3); 2539 rbuf[5] = last_lba >> (8 * 2); 2540 rbuf[6] = last_lba >> (8 * 1); 2541 rbuf[7] = last_lba; 2542 2543 /* sector size */ 2544 rbuf[ 8] = sector_size >> (8 * 3); 2545 rbuf[ 9] = sector_size >> (8 * 2); 2546 rbuf[10] = sector_size >> (8 * 1); 2547 rbuf[11] = sector_size; 2548 2549 rbuf[12] = 0; 2550 rbuf[13] = log2_per_phys; 2551 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2552 rbuf[15] = lowest_aligned; 2553 2554 if (ata_id_has_trim(args->id) && 2555 !(dev->horkage & ATA_HORKAGE_NOTRIM)) { 2556 rbuf[14] |= 0x80; /* LBPME */ 2557 2558 if (ata_id_has_zero_after_trim(args->id) && 2559 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { 2560 ata_dev_info(dev, "Enabling discard_zeroes_data\n"); 2561 rbuf[14] |= 0x40; /* LBPRZ */ 2562 } 2563 } 2564 } 2565 return 0; 2566} 2567 2568/** 2569 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2570 * @args: device IDENTIFY data / SCSI command of interest. 2571 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2572 * 2573 * Simulate REPORT LUNS command. 2574 * 2575 * LOCKING: 2576 * spin_lock_irqsave(host lock) 2577 */ 2578static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2579{ 2580 VPRINTK("ENTER\n"); 2581 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2582 2583 return 0; 2584} 2585 2586static void atapi_sense_complete(struct ata_queued_cmd *qc) 2587{ 2588 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2589 /* FIXME: not quite right; we don't want the 2590 * translation of taskfile registers into 2591 * a sense descriptors, since that's only 2592 * correct for ATA, not ATAPI 2593 */ 2594 ata_gen_passthru_sense(qc); 2595 } 2596 2597 ata_qc_done(qc); 2598} 2599 2600/* is it pointless to prefer PIO for "safety reasons"? */ 2601static inline int ata_pio_use_silly(struct ata_port *ap) 2602{ 2603 return (ap->flags & ATA_FLAG_PIO_DMA); 2604} 2605 2606static void atapi_request_sense(struct ata_queued_cmd *qc) 2607{ 2608 struct ata_port *ap = qc->ap; 2609 struct scsi_cmnd *cmd = qc->scsicmd; 2610 2611 DPRINTK("ATAPI request sense\n"); 2612 2613 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2614 2615#ifdef CONFIG_ATA_SFF 2616 if (ap->ops->sff_tf_read) 2617 ap->ops->sff_tf_read(ap, &qc->tf); 2618#endif 2619 2620 /* fill these in, for the case where they are -not- overwritten */ 2621 cmd->sense_buffer[0] = 0x70; 2622 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2623 2624 ata_qc_reinit(qc); 2625 2626 /* setup sg table and init transfer direction */ 2627 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2628 ata_sg_init(qc, &qc->sgent, 1); 2629 qc->dma_dir = DMA_FROM_DEVICE; 2630 2631 memset(&qc->cdb, 0, qc->dev->cdb_len); 2632 qc->cdb[0] = REQUEST_SENSE; 2633 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2634 2635 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2636 qc->tf.command = ATA_CMD_PACKET; 2637 2638 if (ata_pio_use_silly(ap)) { 2639 qc->tf.protocol = ATAPI_PROT_DMA; 2640 qc->tf.feature |= ATAPI_PKT_DMA; 2641 } else { 2642 qc->tf.protocol = ATAPI_PROT_PIO; 2643 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2644 qc->tf.lbah = 0; 2645 } 2646 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2647 2648 qc->complete_fn = atapi_sense_complete; 2649 2650 ata_qc_issue(qc); 2651 2652 DPRINTK("EXIT\n"); 2653} 2654 2655static void atapi_qc_complete(struct ata_queued_cmd *qc) 2656{ 2657 struct scsi_cmnd *cmd = qc->scsicmd; 2658 unsigned int err_mask = qc->err_mask; 2659 2660 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2661 2662 /* handle completion from new EH */ 2663 if (unlikely(qc->ap->ops->error_handler && 2664 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2665 2666 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2667 /* FIXME: not quite right; we don't want the 2668 * translation of taskfile registers into a 2669 * sense descriptors, since that's only 2670 * correct for ATA, not ATAPI 2671 */ 2672 ata_gen_passthru_sense(qc); 2673 } 2674 2675 /* SCSI EH automatically locks door if sdev->locked is 2676 * set. Sometimes door lock request continues to 2677 * fail, for example, when no media is present. This 2678 * creates a loop - SCSI EH issues door lock which 2679 * fails and gets invoked again to acquire sense data 2680 * for the failed command. 2681 * 2682 * If door lock fails, always clear sdev->locked to 2683 * avoid this infinite loop. 2684 * 2685 * This may happen before SCSI scan is complete. Make 2686 * sure qc->dev->sdev isn't NULL before dereferencing. 2687 */ 2688 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2689 qc->dev->sdev->locked = 0; 2690 2691 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2692 ata_qc_done(qc); 2693 return; 2694 } 2695 2696 /* successful completion or old EH failure path */ 2697 if (unlikely(err_mask & AC_ERR_DEV)) { 2698 cmd->result = SAM_STAT_CHECK_CONDITION; 2699 atapi_request_sense(qc); 2700 return; 2701 } else if (unlikely(err_mask)) { 2702 /* FIXME: not quite right; we don't want the 2703 * translation of taskfile registers into 2704 * a sense descriptors, since that's only 2705 * correct for ATA, not ATAPI 2706 */ 2707 ata_gen_passthru_sense(qc); 2708 } else { 2709 u8 *scsicmd = cmd->cmnd; 2710 2711 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2712 unsigned long flags; 2713 u8 *buf; 2714 2715 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2716 2717 /* ATAPI devices typically report zero for their SCSI version, 2718 * and sometimes deviate from the spec WRT response data 2719 * format. If SCSI version is reported as zero like normal, 2720 * then we make the following fixups: 1) Fake MMC-5 version, 2721 * to indicate to the Linux scsi midlayer this is a modern 2722 * device. 2) Ensure response data format / ATAPI information 2723 * are always correct. 2724 */ 2725 if (buf[2] == 0) { 2726 buf[2] = 0x5; 2727 buf[3] = 0x32; 2728 } 2729 2730 ata_scsi_rbuf_put(cmd, true, &flags); 2731 } 2732 2733 cmd->result = SAM_STAT_GOOD; 2734 } 2735 2736 ata_qc_done(qc); 2737} 2738/** 2739 * atapi_xlat - Initialize PACKET taskfile 2740 * @qc: command structure to be initialized 2741 * 2742 * LOCKING: 2743 * spin_lock_irqsave(host lock) 2744 * 2745 * RETURNS: 2746 * Zero on success, non-zero on failure. 2747 */ 2748static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2749{ 2750 struct scsi_cmnd *scmd = qc->scsicmd; 2751 struct ata_device *dev = qc->dev; 2752 int nodata = (scmd->sc_data_direction == DMA_NONE); 2753 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2754 unsigned int nbytes; 2755 2756 memset(qc->cdb, 0, dev->cdb_len); 2757 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2758 2759 qc->complete_fn = atapi_qc_complete; 2760 2761 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2762 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2763 qc->tf.flags |= ATA_TFLAG_WRITE; 2764 DPRINTK("direction: write\n"); 2765 } 2766 2767 qc->tf.command = ATA_CMD_PACKET; 2768 ata_qc_set_pc_nbytes(qc); 2769 2770 /* check whether ATAPI DMA is safe */ 2771 if (!nodata && !using_pio && atapi_check_dma(qc)) 2772 using_pio = 1; 2773 2774 /* Some controller variants snoop this value for Packet 2775 * transfers to do state machine and FIFO management. Thus we 2776 * want to set it properly, and for DMA where it is 2777 * effectively meaningless. 2778 */ 2779 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2780 2781 /* Most ATAPI devices which honor transfer chunk size don't 2782 * behave according to the spec when odd chunk size which 2783 * matches the transfer length is specified. If the number of 2784 * bytes to transfer is 2n+1. According to the spec, what 2785 * should happen is to indicate that 2n+1 is going to be 2786 * transferred and transfer 2n+2 bytes where the last byte is 2787 * padding. 2788 * 2789 * In practice, this doesn't happen. ATAPI devices first 2790 * indicate and transfer 2n bytes and then indicate and 2791 * transfer 2 bytes where the last byte is padding. 2792 * 2793 * This inconsistency confuses several controllers which 2794 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2795 * These controllers use actual number of transferred bytes to 2796 * update DMA poitner and transfer of 4n+2 bytes make those 2797 * controller push DMA pointer by 4n+4 bytes because SATA data 2798 * FISes are aligned to 4 bytes. This causes data corruption 2799 * and buffer overrun. 2800 * 2801 * Always setting nbytes to even number solves this problem 2802 * because then ATAPI devices don't have to split data at 2n 2803 * boundaries. 2804 */ 2805 if (nbytes & 0x1) 2806 nbytes++; 2807 2808 qc->tf.lbam = (nbytes & 0xFF); 2809 qc->tf.lbah = (nbytes >> 8); 2810 2811 if (nodata) 2812 qc->tf.protocol = ATAPI_PROT_NODATA; 2813 else if (using_pio) 2814 qc->tf.protocol = ATAPI_PROT_PIO; 2815 else { 2816 /* DMA data xfer */ 2817 qc->tf.protocol = ATAPI_PROT_DMA; 2818 qc->tf.feature |= ATAPI_PKT_DMA; 2819 2820 if ((dev->flags & ATA_DFLAG_DMADIR) && 2821 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2822 /* some SATA bridges need us to indicate data xfer direction */ 2823 qc->tf.feature |= ATAPI_DMADIR; 2824 } 2825 2826 2827 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2828 as ATAPI tape drives don't get this right otherwise */ 2829 return 0; 2830} 2831 2832static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2833{ 2834 if (!sata_pmp_attached(ap)) { 2835 if (likely(devno < ata_link_max_devices(&ap->link))) 2836 return &ap->link.device[devno]; 2837 } else { 2838 if (likely(devno < ap->nr_pmp_links)) 2839 return &ap->pmp_link[devno].device[0]; 2840 } 2841 2842 return NULL; 2843} 2844 2845static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2846 const struct scsi_device *scsidev) 2847{ 2848 int devno; 2849 2850 /* skip commands not addressed to targets we simulate */ 2851 if (!sata_pmp_attached(ap)) { 2852 if (unlikely(scsidev->channel || scsidev->lun)) 2853 return NULL; 2854 devno = scsidev->id; 2855 } else { 2856 if (unlikely(scsidev->id || scsidev->lun)) 2857 return NULL; 2858 devno = scsidev->channel; 2859 } 2860 2861 return ata_find_dev(ap, devno); 2862} 2863 2864/** 2865 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2866 * @ap: ATA port to which the device is attached 2867 * @scsidev: SCSI device from which we derive the ATA device 2868 * 2869 * Given various information provided in struct scsi_cmnd, 2870 * map that onto an ATA bus, and using that mapping 2871 * determine which ata_device is associated with the 2872 * SCSI command to be sent. 2873 * 2874 * LOCKING: 2875 * spin_lock_irqsave(host lock) 2876 * 2877 * RETURNS: 2878 * Associated ATA device, or %NULL if not found. 2879 */ 2880static struct ata_device * 2881ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2882{ 2883 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2884 2885 if (unlikely(!dev || !ata_dev_enabled(dev))) 2886 return NULL; 2887 2888 return dev; 2889} 2890 2891/* 2892 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2893 * @byte1: Byte 1 from pass-thru CDB. 2894 * 2895 * RETURNS: 2896 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2897 */ 2898static u8 2899ata_scsi_map_proto(u8 byte1) 2900{ 2901 switch((byte1 & 0x1e) >> 1) { 2902 case 3: /* Non-data */ 2903 return ATA_PROT_NODATA; 2904 2905 case 6: /* DMA */ 2906 case 10: /* UDMA Data-in */ 2907 case 11: /* UDMA Data-Out */ 2908 return ATA_PROT_DMA; 2909 2910 case 4: /* PIO Data-in */ 2911 case 5: /* PIO Data-out */ 2912 return ATA_PROT_PIO; 2913 2914 case 12: /* FPDMA */ 2915 return ATA_PROT_NCQ; 2916 2917 case 0: /* Hard Reset */ 2918 case 1: /* SRST */ 2919 case 8: /* Device Diagnostic */ 2920 case 9: /* Device Reset */ 2921 case 7: /* DMA Queued */ 2922 case 15: /* Return Response Info */ 2923 default: /* Reserved */ 2924 break; 2925 } 2926 2927 return ATA_PROT_UNKNOWN; 2928} 2929 2930/** 2931 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2932 * @qc: command structure to be initialized 2933 * 2934 * Handles either 12 or 16-byte versions of the CDB. 2935 * 2936 * RETURNS: 2937 * Zero on success, non-zero on failure. 2938 */ 2939static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2940{ 2941 struct ata_taskfile *tf = &(qc->tf); 2942 struct scsi_cmnd *scmd = qc->scsicmd; 2943 struct ata_device *dev = qc->dev; 2944 const u8 *cdb = scmd->cmnd; 2945 2946 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2947 goto invalid_fld; 2948 2949 /* enable LBA */ 2950 tf->flags |= ATA_TFLAG_LBA; 2951 2952 /* 2953 * 12 and 16 byte CDBs use different offsets to 2954 * provide the various register values. 2955 */ 2956 if (cdb[0] == ATA_16) { 2957 /* 2958 * 16-byte CDB - may contain extended commands. 2959 * 2960 * If that is the case, copy the upper byte register values. 2961 */ 2962 if (cdb[1] & 0x01) { 2963 tf->hob_feature = cdb[3]; 2964 tf->hob_nsect = cdb[5]; 2965 tf->hob_lbal = cdb[7]; 2966 tf->hob_lbam = cdb[9]; 2967 tf->hob_lbah = cdb[11]; 2968 tf->flags |= ATA_TFLAG_LBA48; 2969 } else 2970 tf->flags &= ~ATA_TFLAG_LBA48; 2971 2972 /* 2973 * Always copy low byte, device and command registers. 2974 */ 2975 tf->feature = cdb[4]; 2976 tf->nsect = cdb[6]; 2977 tf->lbal = cdb[8]; 2978 tf->lbam = cdb[10]; 2979 tf->lbah = cdb[12]; 2980 tf->device = cdb[13]; 2981 tf->command = cdb[14]; 2982 } else { 2983 /* 2984 * 12-byte CDB - incapable of extended commands. 2985 */ 2986 tf->flags &= ~ATA_TFLAG_LBA48; 2987 2988 tf->feature = cdb[3]; 2989 tf->nsect = cdb[4]; 2990 tf->lbal = cdb[5]; 2991 tf->lbam = cdb[6]; 2992 tf->lbah = cdb[7]; 2993 tf->device = cdb[8]; 2994 tf->command = cdb[9]; 2995 } 2996 2997 /* For NCQ commands with FPDMA protocol, copy the tag value */ 2998 if (tf->protocol == ATA_PROT_NCQ) 2999 tf->nsect = qc->tag << 3; 3000 3001 /* enforce correct master/slave bit */ 3002 tf->device = dev->devno ? 3003 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 3004 3005 switch (tf->command) { 3006 /* READ/WRITE LONG use a non-standard sect_size */ 3007 case ATA_CMD_READ_LONG: 3008 case ATA_CMD_READ_LONG_ONCE: 3009 case ATA_CMD_WRITE_LONG: 3010 case ATA_CMD_WRITE_LONG_ONCE: 3011 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 3012 goto invalid_fld; 3013 qc->sect_size = scsi_bufflen(scmd); 3014 break; 3015 3016 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 3017 case ATA_CMD_CFA_WRITE_NE: 3018 case ATA_CMD_CFA_TRANS_SECT: 3019 case ATA_CMD_CFA_WRITE_MULT_NE: 3020 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 3021 case ATA_CMD_READ: 3022 case ATA_CMD_READ_EXT: 3023 case ATA_CMD_READ_QUEUED: 3024 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 3025 case ATA_CMD_FPDMA_READ: 3026 case ATA_CMD_READ_MULTI: 3027 case ATA_CMD_READ_MULTI_EXT: 3028 case ATA_CMD_PIO_READ: 3029 case ATA_CMD_PIO_READ_EXT: 3030 case ATA_CMD_READ_STREAM_DMA_EXT: 3031 case ATA_CMD_READ_STREAM_EXT: 3032 case ATA_CMD_VERIFY: 3033 case ATA_CMD_VERIFY_EXT: 3034 case ATA_CMD_WRITE: 3035 case ATA_CMD_WRITE_EXT: 3036 case ATA_CMD_WRITE_FUA_EXT: 3037 case ATA_CMD_WRITE_QUEUED: 3038 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 3039 case ATA_CMD_FPDMA_WRITE: 3040 case ATA_CMD_WRITE_MULTI: 3041 case ATA_CMD_WRITE_MULTI_EXT: 3042 case ATA_CMD_WRITE_MULTI_FUA_EXT: 3043 case ATA_CMD_PIO_WRITE: 3044 case ATA_CMD_PIO_WRITE_EXT: 3045 case ATA_CMD_WRITE_STREAM_DMA_EXT: 3046 case ATA_CMD_WRITE_STREAM_EXT: 3047 qc->sect_size = scmd->device->sector_size; 3048 break; 3049 3050 /* Everything else uses 512 byte "sectors" */ 3051 default: 3052 qc->sect_size = ATA_SECT_SIZE; 3053 } 3054 3055 /* 3056 * Set flags so that all registers will be written, pass on 3057 * write indication (used for PIO/DMA setup), result TF is 3058 * copied back and we don't whine too much about its failure. 3059 */ 3060 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3061 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3062 tf->flags |= ATA_TFLAG_WRITE; 3063 3064 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3065 3066 /* 3067 * Set transfer length. 3068 * 3069 * TODO: find out if we need to do more here to 3070 * cover scatter/gather case. 3071 */ 3072 ata_qc_set_pc_nbytes(qc); 3073 3074 /* We may not issue DMA commands if no DMA mode is set */ 3075 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3076 goto invalid_fld; 3077 3078 /* sanity check for pio multi commands */ 3079 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3080 goto invalid_fld; 3081 3082 if (is_multi_taskfile(tf)) { 3083 unsigned int multi_count = 1 << (cdb[1] >> 5); 3084 3085 /* compare the passed through multi_count 3086 * with the cached multi_count of libata 3087 */ 3088 if (multi_count != dev->multi_count) 3089 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3090 multi_count); 3091 } 3092 3093 /* 3094 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3095 * SET_FEATURES - XFER MODE must be preceded/succeeded 3096 * by an update to hardware-specific registers for each 3097 * controller (i.e. the reason for ->set_piomode(), 3098 * ->set_dmamode(), and ->post_set_mode() hooks). 3099 */ 3100 if (tf->command == ATA_CMD_SET_FEATURES && 3101 tf->feature == SETFEATURES_XFER) 3102 goto invalid_fld; 3103 3104 /* 3105 * Filter TPM commands by default. These provide an 3106 * essentially uncontrolled encrypted "back door" between 3107 * applications and the disk. Set libata.allow_tpm=1 if you 3108 * have a real reason for wanting to use them. This ensures 3109 * that installed software cannot easily mess stuff up without 3110 * user intent. DVR type users will probably ship with this enabled 3111 * for movie content management. 3112 * 3113 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3114 * for this and should do in future but that it is not sufficient as 3115 * DCS is an optional feature set. Thus we also do the software filter 3116 * so that we comply with the TC consortium stated goal that the user 3117 * can turn off TC features of their system. 3118 */ 3119 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3120 goto invalid_fld; 3121 3122 return 0; 3123 3124 invalid_fld: 3125 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3126 /* "Invalid field in cdb" */ 3127 return 1; 3128} 3129 3130static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3131{ 3132 struct ata_taskfile *tf = &qc->tf; 3133 struct scsi_cmnd *scmd = qc->scsicmd; 3134 struct ata_device *dev = qc->dev; 3135 const u8 *cdb = scmd->cmnd; 3136 u64 block; 3137 u32 n_block; 3138 u32 size; 3139 void *buf; 3140 3141 /* we may not issue DMA commands if no DMA mode is set */ 3142 if (unlikely(!dev->dma_mode)) 3143 goto invalid_fld; 3144 3145 if (unlikely(scmd->cmd_len < 16)) 3146 goto invalid_fld; 3147 scsi_16_lba_len(cdb, &block, &n_block); 3148 3149 /* for now we only support WRITE SAME with the unmap bit set */ 3150 if (unlikely(!(cdb[1] & 0x8))) 3151 goto invalid_fld; 3152 3153 /* 3154 * WRITE SAME always has a sector sized buffer as payload, this 3155 * should never be a multiple entry S/G list. 3156 */ 3157 if (!scsi_sg_count(scmd)) 3158 goto invalid_fld; 3159 3160 buf = page_address(sg_page(scsi_sglist(scmd))); 3161 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3162 3163 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3164 /* Newer devices support queued TRIM commands */ 3165 tf->protocol = ATA_PROT_NCQ; 3166 tf->command = ATA_CMD_FPDMA_SEND; 3167 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3168 tf->nsect = qc->tag << 3; 3169 tf->hob_feature = (size / 512) >> 8; 3170 tf->feature = size / 512; 3171 3172 tf->auxiliary = 1; 3173 } else { 3174 tf->protocol = ATA_PROT_DMA; 3175 tf->hob_feature = 0; 3176 tf->feature = ATA_DSM_TRIM; 3177 tf->hob_nsect = (size / 512) >> 8; 3178 tf->nsect = size / 512; 3179 tf->command = ATA_CMD_DSM; 3180 } 3181 3182 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3183 ATA_TFLAG_WRITE; 3184 3185 ata_qc_set_pc_nbytes(qc); 3186 3187 return 0; 3188 3189 invalid_fld: 3190 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3191 /* "Invalid field in cdb" */ 3192 return 1; 3193} 3194 3195/** 3196 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3197 * @qc: Storage for translated ATA taskfile 3198 * @buf: input buffer 3199 * @len: number of valid bytes in the input buffer 3200 * 3201 * Prepare a taskfile to modify caching information for the device. 3202 * 3203 * LOCKING: 3204 * None. 3205 */ 3206static int ata_mselect_caching(struct ata_queued_cmd *qc, 3207 const u8 *buf, int len) 3208{ 3209 struct ata_taskfile *tf = &qc->tf; 3210 struct ata_device *dev = qc->dev; 3211 char mpage[CACHE_MPAGE_LEN]; 3212 u8 wce; 3213 3214 /* 3215 * The first two bytes of def_cache_mpage are a header, so offsets 3216 * in mpage are off by 2 compared to buf. Same for len. 3217 */ 3218 3219 if (len != CACHE_MPAGE_LEN - 2) 3220 return -EINVAL; 3221 3222 wce = buf[0] & (1 << 2); 3223 3224 /* 3225 * Check that read-only bits are not modified. 3226 */ 3227 ata_msense_caching(dev->id, mpage, false); 3228 mpage[2] &= ~(1 << 2); 3229 mpage[2] |= wce; 3230 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3231 return -EINVAL; 3232 3233 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3234 tf->protocol = ATA_PROT_NODATA; 3235 tf->nsect = 0; 3236 tf->command = ATA_CMD_SET_FEATURES; 3237 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3238 return 0; 3239} 3240 3241/** 3242 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3243 * @qc: Storage for translated ATA taskfile 3244 * 3245 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3246 * Assume this is invoked for direct access devices (e.g. disks) only. 3247 * There should be no block descriptor for other device types. 3248 * 3249 * LOCKING: 3250 * spin_lock_irqsave(host lock) 3251 */ 3252static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3253{ 3254 struct scsi_cmnd *scmd = qc->scsicmd; 3255 const u8 *cdb = scmd->cmnd; 3256 const u8 *p; 3257 u8 pg, spg; 3258 unsigned six_byte, pg_len, hdr_len, bd_len; 3259 int len; 3260 3261 VPRINTK("ENTER\n"); 3262 3263 six_byte = (cdb[0] == MODE_SELECT); 3264 if (six_byte) { 3265 if (scmd->cmd_len < 5) 3266 goto invalid_fld; 3267 3268 len = cdb[4]; 3269 hdr_len = 4; 3270 } else { 3271 if (scmd->cmd_len < 9) 3272 goto invalid_fld; 3273 3274 len = (cdb[7] << 8) + cdb[8]; 3275 hdr_len = 8; 3276 } 3277 3278 /* We only support PF=1, SP=0. */ 3279 if ((cdb[1] & 0x11) != 0x10) 3280 goto invalid_fld; 3281 3282 /* Test early for possible overrun. */ 3283 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3284 goto invalid_param_len; 3285 3286 p = page_address(sg_page(scsi_sglist(scmd))); 3287 3288 /* Move past header and block descriptors. */ 3289 if (len < hdr_len) 3290 goto invalid_param_len; 3291 3292 if (six_byte) 3293 bd_len = p[3]; 3294 else 3295 bd_len = (p[6] << 8) + p[7]; 3296 3297 len -= hdr_len; 3298 p += hdr_len; 3299 if (len < bd_len) 3300 goto invalid_param_len; 3301 if (bd_len != 0 && bd_len != 8) 3302 goto invalid_param; 3303 3304 len -= bd_len; 3305 p += bd_len; 3306 if (len == 0) 3307 goto skip; 3308 3309 /* Parse both possible formats for the mode page headers. */ 3310 pg = p[0] & 0x3f; 3311 if (p[0] & 0x40) { 3312 if (len < 4) 3313 goto invalid_param_len; 3314 3315 spg = p[1]; 3316 pg_len = (p[2] << 8) | p[3]; 3317 p += 4; 3318 len -= 4; 3319 } else { 3320 if (len < 2) 3321 goto invalid_param_len; 3322 3323 spg = 0; 3324 pg_len = p[1]; 3325 p += 2; 3326 len -= 2; 3327 } 3328 3329 /* 3330 * No mode subpages supported (yet) but asking for _all_ 3331 * subpages may be valid 3332 */ 3333 if (spg && (spg != ALL_SUB_MPAGES)) 3334 goto invalid_param; 3335 if (pg_len > len) 3336 goto invalid_param_len; 3337 3338 switch (pg) { 3339 case CACHE_MPAGE: 3340 if (ata_mselect_caching(qc, p, pg_len) < 0) 3341 goto invalid_param; 3342 break; 3343 3344 default: /* invalid page code */ 3345 goto invalid_param; 3346 } 3347 3348 /* 3349 * Only one page has changeable data, so we only support setting one 3350 * page at a time. 3351 */ 3352 if (len > pg_len) 3353 goto invalid_param; 3354 3355 return 0; 3356 3357 invalid_fld: 3358 /* "Invalid field in CDB" */ 3359 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3360 return 1; 3361 3362 invalid_param: 3363 /* "Invalid field in parameter list" */ 3364 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3365 return 1; 3366 3367 invalid_param_len: 3368 /* "Parameter list length error" */ 3369 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3370 return 1; 3371 3372 skip: 3373 scmd->result = SAM_STAT_GOOD; 3374 return 1; 3375} 3376 3377/** 3378 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3379 * @dev: ATA device 3380 * @cmd: SCSI command opcode to consider 3381 * 3382 * Look up the SCSI command given, and determine whether the 3383 * SCSI command is to be translated or simulated. 3384 * 3385 * RETURNS: 3386 * Pointer to translation function if possible, %NULL if not. 3387 */ 3388 3389static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3390{ 3391 switch (cmd) { 3392 case READ_6: 3393 case READ_10: 3394 case READ_16: 3395 3396 case WRITE_6: 3397 case WRITE_10: 3398 case WRITE_16: 3399 return ata_scsi_rw_xlat; 3400 3401 case WRITE_SAME_16: 3402 return ata_scsi_write_same_xlat; 3403 3404 case SYNCHRONIZE_CACHE: 3405 if (ata_try_flush_cache(dev)) 3406 return ata_scsi_flush_xlat; 3407 break; 3408 3409 case VERIFY: 3410 case VERIFY_16: 3411 return ata_scsi_verify_xlat; 3412 3413 case ATA_12: 3414 case ATA_16: 3415 return ata_scsi_pass_thru; 3416 3417 case MODE_SELECT: 3418 case MODE_SELECT_10: 3419 return ata_scsi_mode_select_xlat; 3420 break; 3421 3422 case START_STOP: 3423 return ata_scsi_start_stop_xlat; 3424 } 3425 3426 return NULL; 3427} 3428 3429/** 3430 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3431 * @ap: ATA port to which the command was being sent 3432 * @cmd: SCSI command to dump 3433 * 3434 * Prints the contents of a SCSI command via printk(). 3435 */ 3436 3437static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3438 struct scsi_cmnd *cmd) 3439{ 3440#ifdef ATA_DEBUG 3441 struct scsi_device *scsidev = cmd->device; 3442 u8 *scsicmd = cmd->cmnd; 3443 3444 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3445 ap->print_id, 3446 scsidev->channel, scsidev->id, scsidev->lun, 3447 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3448 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3449 scsicmd[8]); 3450#endif 3451} 3452 3453static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3454 struct ata_device *dev) 3455{ 3456 u8 scsi_op = scmd->cmnd[0]; 3457 ata_xlat_func_t xlat_func; 3458 int rc = 0; 3459 3460 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) { 3461 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3462 goto bad_cdb_len; 3463 3464 xlat_func = ata_get_xlat_func(dev, scsi_op); 3465 } else { 3466 if (unlikely(!scmd->cmd_len)) 3467 goto bad_cdb_len; 3468 3469 xlat_func = NULL; 3470 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3471 /* relay SCSI command to ATAPI device */ 3472 int len = COMMAND_SIZE(scsi_op); 3473 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3474 goto bad_cdb_len; 3475 3476 xlat_func = atapi_xlat; 3477 } else { 3478 /* ATA_16 passthru, treat as an ATA command */ 3479 if (unlikely(scmd->cmd_len > 16)) 3480 goto bad_cdb_len; 3481 3482 xlat_func = ata_get_xlat_func(dev, scsi_op); 3483 } 3484 } 3485 3486 if (xlat_func) 3487 rc = ata_scsi_translate(dev, scmd, xlat_func); 3488 else 3489 ata_scsi_simulate(dev, scmd); 3490 3491 return rc; 3492 3493 bad_cdb_len: 3494 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3495 scmd->cmd_len, scsi_op, dev->cdb_len); 3496 scmd->result = DID_ERROR << 16; 3497 scmd->scsi_done(scmd); 3498 return 0; 3499} 3500 3501/** 3502 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3503 * @shost: SCSI host of command to be sent 3504 * @cmd: SCSI command to be sent 3505 * 3506 * In some cases, this function translates SCSI commands into 3507 * ATA taskfiles, and queues the taskfiles to be sent to 3508 * hardware. In other cases, this function simulates a 3509 * SCSI device by evaluating and responding to certain 3510 * SCSI commands. This creates the overall effect of 3511 * ATA and ATAPI devices appearing as SCSI devices. 3512 * 3513 * LOCKING: 3514 * ATA host lock 3515 * 3516 * RETURNS: 3517 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3518 * 0 otherwise. 3519 */ 3520int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3521{ 3522 struct ata_port *ap; 3523 struct ata_device *dev; 3524 struct scsi_device *scsidev = cmd->device; 3525 int rc = 0; 3526 unsigned long irq_flags; 3527 3528 ap = ata_shost_to_port(shost); 3529 3530 spin_lock_irqsave(ap->lock, irq_flags); 3531 3532 ata_scsi_dump_cdb(ap, cmd); 3533 3534 dev = ata_scsi_find_dev(ap, scsidev); 3535 if (likely(dev)) 3536 rc = __ata_scsi_queuecmd(cmd, dev); 3537 else { 3538 cmd->result = (DID_BAD_TARGET << 16); 3539 cmd->scsi_done(cmd); 3540 } 3541 3542 spin_unlock_irqrestore(ap->lock, irq_flags); 3543 3544 return rc; 3545} 3546 3547/** 3548 * ata_scsi_simulate - simulate SCSI command on ATA device 3549 * @dev: the target device 3550 * @cmd: SCSI command being sent to device. 3551 * 3552 * Interprets and directly executes a select list of SCSI commands 3553 * that can be handled internally. 3554 * 3555 * LOCKING: 3556 * spin_lock_irqsave(host lock) 3557 */ 3558 3559void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3560{ 3561 struct ata_scsi_args args; 3562 const u8 *scsicmd = cmd->cmnd; 3563 u8 tmp8; 3564 3565 args.dev = dev; 3566 args.id = dev->id; 3567 args.cmd = cmd; 3568 args.done = cmd->scsi_done; 3569 3570 switch(scsicmd[0]) { 3571 /* TODO: worth improving? */ 3572 case FORMAT_UNIT: 3573 ata_scsi_invalid_field(cmd); 3574 break; 3575 3576 case INQUIRY: 3577 if (scsicmd[1] & 2) /* is CmdDt set? */ 3578 ata_scsi_invalid_field(cmd); 3579 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3580 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3581 else switch (scsicmd[2]) { 3582 case 0x00: 3583 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3584 break; 3585 case 0x80: 3586 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3587 break; 3588 case 0x83: 3589 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3590 break; 3591 case 0x89: 3592 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3593 break; 3594 case 0xb0: 3595 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3596 break; 3597 case 0xb1: 3598 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3599 break; 3600 case 0xb2: 3601 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3602 break; 3603 default: 3604 ata_scsi_invalid_field(cmd); 3605 break; 3606 } 3607 break; 3608 3609 case MODE_SENSE: 3610 case MODE_SENSE_10: 3611 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3612 break; 3613 3614 case READ_CAPACITY: 3615 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3616 break; 3617 3618 case SERVICE_ACTION_IN_16: 3619 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3620 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3621 else 3622 ata_scsi_invalid_field(cmd); 3623 break; 3624 3625 case REPORT_LUNS: 3626 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3627 break; 3628 3629 case REQUEST_SENSE: 3630 ata_scsi_set_sense(cmd, 0, 0, 0); 3631 cmd->result = (DRIVER_SENSE << 24); 3632 cmd->scsi_done(cmd); 3633 break; 3634 3635 /* if we reach this, then writeback caching is disabled, 3636 * turning this into a no-op. 3637 */ 3638 case SYNCHRONIZE_CACHE: 3639 /* fall through */ 3640 3641 /* no-op's, complete with success */ 3642 case REZERO_UNIT: 3643 case SEEK_6: 3644 case SEEK_10: 3645 case TEST_UNIT_READY: 3646 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3647 break; 3648 3649 case SEND_DIAGNOSTIC: 3650 tmp8 = scsicmd[1] & ~(1 << 3); 3651 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3652 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3653 else 3654 ata_scsi_invalid_field(cmd); 3655 break; 3656 3657 /* all other commands */ 3658 default: 3659 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3660 /* "Invalid command operation code" */ 3661 cmd->scsi_done(cmd); 3662 break; 3663 } 3664} 3665 3666int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3667{ 3668 int i, rc; 3669 3670 for (i = 0; i < host->n_ports; i++) { 3671 struct ata_port *ap = host->ports[i]; 3672 struct Scsi_Host *shost; 3673 3674 rc = -ENOMEM; 3675 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3676 if (!shost) 3677 goto err_alloc; 3678 3679 shost->eh_noresume = 1; 3680 *(struct ata_port **)&shost->hostdata[0] = ap; 3681 ap->scsi_host = shost; 3682 3683 shost->transportt = ata_scsi_transport_template; 3684 shost->unique_id = ap->print_id; 3685 shost->max_id = 16; 3686 shost->max_lun = 1; 3687 shost->max_channel = 1; 3688 shost->max_cmd_len = 16; 3689 shost->no_write_same = 1; 3690 3691 /* Schedule policy is determined by ->qc_defer() 3692 * callback and it needs to see every deferred qc. 3693 * Set host_blocked to 1 to prevent SCSI midlayer from 3694 * automatically deferring requests. 3695 */ 3696 shost->max_host_blocked = 1; 3697 3698 rc = scsi_add_host_with_dma(ap->scsi_host, 3699 &ap->tdev, ap->host->dev); 3700 if (rc) 3701 goto err_add; 3702 } 3703 3704 return 0; 3705 3706 err_add: 3707 scsi_host_put(host->ports[i]->scsi_host); 3708 err_alloc: 3709 while (--i >= 0) { 3710 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3711 3712 scsi_remove_host(shost); 3713 scsi_host_put(shost); 3714 } 3715 return rc; 3716} 3717 3718void ata_scsi_scan_host(struct ata_port *ap, int sync) 3719{ 3720 int tries = 5; 3721 struct ata_device *last_failed_dev = NULL; 3722 struct ata_link *link; 3723 struct ata_device *dev; 3724 3725 repeat: 3726 ata_for_each_link(link, ap, EDGE) { 3727 ata_for_each_dev(dev, link, ENABLED) { 3728 struct scsi_device *sdev; 3729 int channel = 0, id = 0; 3730 3731 if (dev->sdev) 3732 continue; 3733 3734 if (ata_is_host_link(link)) 3735 id = dev->devno; 3736 else 3737 channel = link->pmp; 3738 3739 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3740 NULL); 3741 if (!IS_ERR(sdev)) { 3742 dev->sdev = sdev; 3743 scsi_device_put(sdev); 3744 } else { 3745 dev->sdev = NULL; 3746 } 3747 } 3748 } 3749 3750 /* If we scanned while EH was in progress or allocation 3751 * failure occurred, scan would have failed silently. Check 3752 * whether all devices are attached. 3753 */ 3754 ata_for_each_link(link, ap, EDGE) { 3755 ata_for_each_dev(dev, link, ENABLED) { 3756 if (!dev->sdev) 3757 goto exit_loop; 3758 } 3759 } 3760 exit_loop: 3761 if (!link) 3762 return; 3763 3764 /* we're missing some SCSI devices */ 3765 if (sync) { 3766 /* If caller requested synchrnous scan && we've made 3767 * any progress, sleep briefly and repeat. 3768 */ 3769 if (dev != last_failed_dev) { 3770 msleep(100); 3771 last_failed_dev = dev; 3772 goto repeat; 3773 } 3774 3775 /* We might be failing to detect boot device, give it 3776 * a few more chances. 3777 */ 3778 if (--tries) { 3779 msleep(100); 3780 goto repeat; 3781 } 3782 3783 ata_port_err(ap, 3784 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3785 } 3786 3787 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3788 round_jiffies_relative(HZ)); 3789} 3790 3791/** 3792 * ata_scsi_offline_dev - offline attached SCSI device 3793 * @dev: ATA device to offline attached SCSI device for 3794 * 3795 * This function is called from ata_eh_hotplug() and responsible 3796 * for taking the SCSI device attached to @dev offline. This 3797 * function is called with host lock which protects dev->sdev 3798 * against clearing. 3799 * 3800 * LOCKING: 3801 * spin_lock_irqsave(host lock) 3802 * 3803 * RETURNS: 3804 * 1 if attached SCSI device exists, 0 otherwise. 3805 */ 3806int ata_scsi_offline_dev(struct ata_device *dev) 3807{ 3808 if (dev->sdev) { 3809 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3810 return 1; 3811 } 3812 return 0; 3813} 3814 3815/** 3816 * ata_scsi_remove_dev - remove attached SCSI device 3817 * @dev: ATA device to remove attached SCSI device for 3818 * 3819 * This function is called from ata_eh_scsi_hotplug() and 3820 * responsible for removing the SCSI device attached to @dev. 3821 * 3822 * LOCKING: 3823 * Kernel thread context (may sleep). 3824 */ 3825static void ata_scsi_remove_dev(struct ata_device *dev) 3826{ 3827 struct ata_port *ap = dev->link->ap; 3828 struct scsi_device *sdev; 3829 unsigned long flags; 3830 3831 /* Alas, we need to grab scan_mutex to ensure SCSI device 3832 * state doesn't change underneath us and thus 3833 * scsi_device_get() always succeeds. The mutex locking can 3834 * be removed if there is __scsi_device_get() interface which 3835 * increments reference counts regardless of device state. 3836 */ 3837 mutex_lock(&ap->scsi_host->scan_mutex); 3838 spin_lock_irqsave(ap->lock, flags); 3839 3840 /* clearing dev->sdev is protected by host lock */ 3841 sdev = dev->sdev; 3842 dev->sdev = NULL; 3843 3844 if (sdev) { 3845 /* If user initiated unplug races with us, sdev can go 3846 * away underneath us after the host lock and 3847 * scan_mutex are released. Hold onto it. 3848 */ 3849 if (scsi_device_get(sdev) == 0) { 3850 /* The following ensures the attached sdev is 3851 * offline on return from ata_scsi_offline_dev() 3852 * regardless it wins or loses the race 3853 * against this function. 3854 */ 3855 scsi_device_set_state(sdev, SDEV_OFFLINE); 3856 } else { 3857 WARN_ON(1); 3858 sdev = NULL; 3859 } 3860 } 3861 3862 spin_unlock_irqrestore(ap->lock, flags); 3863 mutex_unlock(&ap->scsi_host->scan_mutex); 3864 3865 if (sdev) { 3866 ata_dev_info(dev, "detaching (SCSI %s)\n", 3867 dev_name(&sdev->sdev_gendev)); 3868 3869 scsi_remove_device(sdev); 3870 scsi_device_put(sdev); 3871 } 3872} 3873 3874static void ata_scsi_handle_link_detach(struct ata_link *link) 3875{ 3876 struct ata_port *ap = link->ap; 3877 struct ata_device *dev; 3878 3879 ata_for_each_dev(dev, link, ALL) { 3880 unsigned long flags; 3881 3882 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3883 continue; 3884 3885 spin_lock_irqsave(ap->lock, flags); 3886 dev->flags &= ~ATA_DFLAG_DETACHED; 3887 spin_unlock_irqrestore(ap->lock, flags); 3888 3889 if (zpodd_dev_enabled(dev)) 3890 zpodd_exit(dev); 3891 3892 ata_scsi_remove_dev(dev); 3893 } 3894} 3895 3896/** 3897 * ata_scsi_media_change_notify - send media change event 3898 * @dev: Pointer to the disk device with media change event 3899 * 3900 * Tell the block layer to send a media change notification 3901 * event. 3902 * 3903 * LOCKING: 3904 * spin_lock_irqsave(host lock) 3905 */ 3906void ata_scsi_media_change_notify(struct ata_device *dev) 3907{ 3908 if (dev->sdev) 3909 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3910 GFP_ATOMIC); 3911} 3912 3913/** 3914 * ata_scsi_hotplug - SCSI part of hotplug 3915 * @work: Pointer to ATA port to perform SCSI hotplug on 3916 * 3917 * Perform SCSI part of hotplug. It's executed from a separate 3918 * workqueue after EH completes. This is necessary because SCSI 3919 * hot plugging requires working EH and hot unplugging is 3920 * synchronized with hot plugging with a mutex. 3921 * 3922 * LOCKING: 3923 * Kernel thread context (may sleep). 3924 */ 3925void ata_scsi_hotplug(struct work_struct *work) 3926{ 3927 struct ata_port *ap = 3928 container_of(work, struct ata_port, hotplug_task.work); 3929 int i; 3930 3931 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3932 DPRINTK("ENTER/EXIT - unloading\n"); 3933 return; 3934 } 3935 3936 /* 3937 * XXX - UGLY HACK 3938 * 3939 * The block layer suspend/resume path is fundamentally broken due 3940 * to freezable kthreads and workqueue and may deadlock if a block 3941 * device gets removed while resume is in progress. I don't know 3942 * what the solution is short of removing freezable kthreads and 3943 * workqueues altogether. 3944 * 3945 * The following is an ugly hack to avoid kicking off device 3946 * removal while freezer is active. This is a joke but does avoid 3947 * this particular deadlock scenario. 3948 * 3949 * https://bugzilla.kernel.org/show_bug.cgi?id=62801 3950 * http://marc.info/?l=linux-kernel&m=138695698516487 3951 */ 3952#ifdef CONFIG_FREEZER 3953 while (pm_freezing) 3954 msleep(10); 3955#endif 3956 3957 DPRINTK("ENTER\n"); 3958 mutex_lock(&ap->scsi_scan_mutex); 3959 3960 /* Unplug detached devices. We cannot use link iterator here 3961 * because PMP links have to be scanned even if PMP is 3962 * currently not attached. Iterate manually. 3963 */ 3964 ata_scsi_handle_link_detach(&ap->link); 3965 if (ap->pmp_link) 3966 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3967 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3968 3969 /* scan for new ones */ 3970 ata_scsi_scan_host(ap, 0); 3971 3972 mutex_unlock(&ap->scsi_scan_mutex); 3973 DPRINTK("EXIT\n"); 3974} 3975 3976/** 3977 * ata_scsi_user_scan - indication for user-initiated bus scan 3978 * @shost: SCSI host to scan 3979 * @channel: Channel to scan 3980 * @id: ID to scan 3981 * @lun: LUN to scan 3982 * 3983 * This function is called when user explicitly requests bus 3984 * scan. Set probe pending flag and invoke EH. 3985 * 3986 * LOCKING: 3987 * SCSI layer (we don't care) 3988 * 3989 * RETURNS: 3990 * Zero. 3991 */ 3992int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3993 unsigned int id, u64 lun) 3994{ 3995 struct ata_port *ap = ata_shost_to_port(shost); 3996 unsigned long flags; 3997 int devno, rc = 0; 3998 3999 if (!ap->ops->error_handler) 4000 return -EOPNOTSUPP; 4001 4002 if (lun != SCAN_WILD_CARD && lun) 4003 return -EINVAL; 4004 4005 if (!sata_pmp_attached(ap)) { 4006 if (channel != SCAN_WILD_CARD && channel) 4007 return -EINVAL; 4008 devno = id; 4009 } else { 4010 if (id != SCAN_WILD_CARD && id) 4011 return -EINVAL; 4012 devno = channel; 4013 } 4014 4015 spin_lock_irqsave(ap->lock, flags); 4016 4017 if (devno == SCAN_WILD_CARD) { 4018 struct ata_link *link; 4019 4020 ata_for_each_link(link, ap, EDGE) { 4021 struct ata_eh_info *ehi = &link->eh_info; 4022 ehi->probe_mask |= ATA_ALL_DEVICES; 4023 ehi->action |= ATA_EH_RESET; 4024 } 4025 } else { 4026 struct ata_device *dev = ata_find_dev(ap, devno); 4027 4028 if (dev) { 4029 struct ata_eh_info *ehi = &dev->link->eh_info; 4030 ehi->probe_mask |= 1 << dev->devno; 4031 ehi->action |= ATA_EH_RESET; 4032 } else 4033 rc = -EINVAL; 4034 } 4035 4036 if (rc == 0) { 4037 ata_port_schedule_eh(ap); 4038 spin_unlock_irqrestore(ap->lock, flags); 4039 ata_port_wait_eh(ap); 4040 } else 4041 spin_unlock_irqrestore(ap->lock, flags); 4042 4043 return rc; 4044} 4045 4046/** 4047 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 4048 * @work: Pointer to ATA port to perform scsi_rescan_device() 4049 * 4050 * After ATA pass thru (SAT) commands are executed successfully, 4051 * libata need to propagate the changes to SCSI layer. 4052 * 4053 * LOCKING: 4054 * Kernel thread context (may sleep). 4055 */ 4056void ata_scsi_dev_rescan(struct work_struct *work) 4057{ 4058 struct ata_port *ap = 4059 container_of(work, struct ata_port, scsi_rescan_task); 4060 struct ata_link *link; 4061 struct ata_device *dev; 4062 unsigned long flags; 4063 4064 mutex_lock(&ap->scsi_scan_mutex); 4065 spin_lock_irqsave(ap->lock, flags); 4066 4067 ata_for_each_link(link, ap, EDGE) { 4068 ata_for_each_dev(dev, link, ENABLED) { 4069 struct scsi_device *sdev = dev->sdev; 4070 4071 if (!sdev) 4072 continue; 4073 if (scsi_device_get(sdev)) 4074 continue; 4075 4076 spin_unlock_irqrestore(ap->lock, flags); 4077 scsi_rescan_device(&(sdev->sdev_gendev)); 4078 scsi_device_put(sdev); 4079 spin_lock_irqsave(ap->lock, flags); 4080 } 4081 } 4082 4083 spin_unlock_irqrestore(ap->lock, flags); 4084 mutex_unlock(&ap->scsi_scan_mutex); 4085} 4086 4087/** 4088 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4089 * @host: ATA host container for all SAS ports 4090 * @port_info: Information from low-level host driver 4091 * @shost: SCSI host that the scsi device is attached to 4092 * 4093 * LOCKING: 4094 * PCI/etc. bus probe sem. 4095 * 4096 * RETURNS: 4097 * ata_port pointer on success / NULL on failure. 4098 */ 4099 4100struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4101 struct ata_port_info *port_info, 4102 struct Scsi_Host *shost) 4103{ 4104 struct ata_port *ap; 4105 4106 ap = ata_port_alloc(host); 4107 if (!ap) 4108 return NULL; 4109 4110 ap->port_no = 0; 4111 ap->lock = &host->lock; 4112 ap->pio_mask = port_info->pio_mask; 4113 ap->mwdma_mask = port_info->mwdma_mask; 4114 ap->udma_mask = port_info->udma_mask; 4115 ap->flags |= port_info->flags; 4116 ap->ops = port_info->port_ops; 4117 ap->cbl = ATA_CBL_SATA; 4118 4119 return ap; 4120} 4121EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4122 4123/** 4124 * ata_sas_port_start - Set port up for dma. 4125 * @ap: Port to initialize 4126 * 4127 * Called just after data structures for each port are 4128 * initialized. 4129 * 4130 * May be used as the port_start() entry in ata_port_operations. 4131 * 4132 * LOCKING: 4133 * Inherited from caller. 4134 */ 4135int ata_sas_port_start(struct ata_port *ap) 4136{ 4137 /* 4138 * the port is marked as frozen at allocation time, but if we don't 4139 * have new eh, we won't thaw it 4140 */ 4141 if (!ap->ops->error_handler) 4142 ap->pflags &= ~ATA_PFLAG_FROZEN; 4143 return 0; 4144} 4145EXPORT_SYMBOL_GPL(ata_sas_port_start); 4146 4147/** 4148 * ata_port_stop - Undo ata_sas_port_start() 4149 * @ap: Port to shut down 4150 * 4151 * May be used as the port_stop() entry in ata_port_operations. 4152 * 4153 * LOCKING: 4154 * Inherited from caller. 4155 */ 4156 4157void ata_sas_port_stop(struct ata_port *ap) 4158{ 4159} 4160EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4161 4162/** 4163 * ata_sas_async_probe - simply schedule probing and return 4164 * @ap: Port to probe 4165 * 4166 * For batch scheduling of probe for sas attached ata devices, assumes 4167 * the port has already been through ata_sas_port_init() 4168 */ 4169void ata_sas_async_probe(struct ata_port *ap) 4170{ 4171 __ata_port_probe(ap); 4172} 4173EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4174 4175int ata_sas_sync_probe(struct ata_port *ap) 4176{ 4177 return ata_port_probe(ap); 4178} 4179EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4180 4181 4182/** 4183 * ata_sas_port_init - Initialize a SATA device 4184 * @ap: SATA port to initialize 4185 * 4186 * LOCKING: 4187 * PCI/etc. bus probe sem. 4188 * 4189 * RETURNS: 4190 * Zero on success, non-zero on error. 4191 */ 4192 4193int ata_sas_port_init(struct ata_port *ap) 4194{ 4195 int rc = ap->ops->port_start(ap); 4196 4197 if (rc) 4198 return rc; 4199 ap->print_id = atomic_inc_return(&ata_print_id); 4200 return 0; 4201} 4202EXPORT_SYMBOL_GPL(ata_sas_port_init); 4203 4204/** 4205 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4206 * @ap: SATA port to destroy 4207 * 4208 */ 4209 4210void ata_sas_port_destroy(struct ata_port *ap) 4211{ 4212 if (ap->ops->port_stop) 4213 ap->ops->port_stop(ap); 4214 kfree(ap); 4215} 4216EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4217 4218/** 4219 * ata_sas_slave_configure - Default slave_config routine for libata devices 4220 * @sdev: SCSI device to configure 4221 * @ap: ATA port to which SCSI device is attached 4222 * 4223 * RETURNS: 4224 * Zero. 4225 */ 4226 4227int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4228{ 4229 ata_scsi_sdev_config(sdev); 4230 ata_scsi_dev_config(sdev, ap->link.device); 4231 return 0; 4232} 4233EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4234 4235/** 4236 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4237 * @cmd: SCSI command to be sent 4238 * @ap: ATA port to which the command is being sent 4239 * 4240 * RETURNS: 4241 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4242 * 0 otherwise. 4243 */ 4244 4245int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4246{ 4247 int rc = 0; 4248 4249 ata_scsi_dump_cdb(ap, cmd); 4250 4251 if (likely(ata_dev_enabled(ap->link.device))) 4252 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4253 else { 4254 cmd->result = (DID_BAD_TARGET << 16); 4255 cmd->scsi_done(cmd); 4256 } 4257 return rc; 4258} 4259EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4260 4261int ata_sas_allocate_tag(struct ata_port *ap) 4262{ 4263 unsigned int max_queue = ap->host->n_tags; 4264 unsigned int i, tag; 4265 4266 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) { 4267 tag = tag < max_queue ? tag : 0; 4268 4269 /* the last tag is reserved for internal command. */ 4270 if (tag == ATA_TAG_INTERNAL) 4271 continue; 4272 4273 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) { 4274 ap->sas_last_tag = tag; 4275 return tag; 4276 } 4277 } 4278 return -1; 4279} 4280 4281void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) 4282{ 4283 clear_bit(tag, &ap->sas_tag_allocated); 4284} 4285