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