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_scsi_change_queue_depth - SCSI callback for queue depth config 1219 * @sdev: SCSI device to configure queue depth for 1220 * @queue_depth: new queue depth 1221 * @reason: calling context 1222 * 1223 * This is libata standard hostt->change_queue_depth callback. 1224 * SCSI will call into this callback when user tries to set queue 1225 * depth via sysfs. 1226 * 1227 * LOCKING: 1228 * SCSI layer (we don't care) 1229 * 1230 * RETURNS: 1231 * Newly configured queue depth. 1232 */ 1233 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1234 int reason) 1235 { 1236 struct ata_port *ap = ata_shost_to_port(sdev->host); 1237 struct ata_device *dev; 1238 unsigned long flags; 1239 1240 if (reason != SCSI_QDEPTH_DEFAULT) 1241 return -EOPNOTSUPP; 1242 1243 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1244 return sdev->queue_depth; 1245 1246 dev = ata_scsi_find_dev(ap, sdev); 1247 if (!dev || !ata_dev_enabled(dev)) 1248 return sdev->queue_depth; 1249 1250 /* NCQ enabled? */ 1251 spin_lock_irqsave(ap->lock, flags); 1252 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1253 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1254 dev->flags |= ATA_DFLAG_NCQ_OFF; 1255 queue_depth = 1; 1256 } 1257 spin_unlock_irqrestore(ap->lock, flags); 1258 1259 /* limit and apply queue depth */ 1260 queue_depth = min(queue_depth, sdev->host->can_queue); 1261 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1262 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1263 1264 if (sdev->queue_depth == queue_depth) 1265 return -EINVAL; 1266 1267 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1268 return queue_depth; 1269 } 1270 1271 /** 1272 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1273 * @qc: Storage for translated ATA taskfile 1274 * 1275 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1276 * (to start). Perhaps these commands should be preceded by 1277 * CHECK POWER MODE to see what power mode the device is already in. 1278 * [See SAT revision 5 at www.t10.org] 1279 * 1280 * LOCKING: 1281 * spin_lock_irqsave(host lock) 1282 * 1283 * RETURNS: 1284 * Zero on success, non-zero on error. 1285 */ 1286 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1287 { 1288 struct scsi_cmnd *scmd = qc->scsicmd; 1289 struct ata_taskfile *tf = &qc->tf; 1290 const u8 *cdb = scmd->cmnd; 1291 1292 if (scmd->cmd_len < 5) 1293 goto invalid_fld; 1294 1295 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1296 tf->protocol = ATA_PROT_NODATA; 1297 if (cdb[1] & 0x1) { 1298 ; /* ignore IMMED bit, violates sat-r05 */ 1299 } 1300 if (cdb[4] & 0x2) 1301 goto invalid_fld; /* LOEJ bit set not supported */ 1302 if (((cdb[4] >> 4) & 0xf) != 0) 1303 goto invalid_fld; /* power conditions not supported */ 1304 1305 if (cdb[4] & 0x1) { 1306 tf->nsect = 1; /* 1 sector, lba=0 */ 1307 1308 if (qc->dev->flags & ATA_DFLAG_LBA) { 1309 tf->flags |= ATA_TFLAG_LBA; 1310 1311 tf->lbah = 0x0; 1312 tf->lbam = 0x0; 1313 tf->lbal = 0x0; 1314 tf->device |= ATA_LBA; 1315 } else { 1316 /* CHS */ 1317 tf->lbal = 0x1; /* sect */ 1318 tf->lbam = 0x0; /* cyl low */ 1319 tf->lbah = 0x0; /* cyl high */ 1320 } 1321 1322 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1323 } else { 1324 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1325 * or S5) causing some drives to spin up and down again. 1326 */ 1327 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1328 system_state == SYSTEM_POWER_OFF) 1329 goto skip; 1330 1331 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1332 system_entering_hibernation()) 1333 goto skip; 1334 1335 /* Issue ATA STANDBY IMMEDIATE command */ 1336 tf->command = ATA_CMD_STANDBYNOW1; 1337 } 1338 1339 /* 1340 * Standby and Idle condition timers could be implemented but that 1341 * would require libata to implement the Power condition mode page 1342 * and allow the user to change it. Changing mode pages requires 1343 * MODE SELECT to be implemented. 1344 */ 1345 1346 return 0; 1347 1348 invalid_fld: 1349 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1350 /* "Invalid field in cbd" */ 1351 return 1; 1352 skip: 1353 scmd->result = SAM_STAT_GOOD; 1354 return 1; 1355 } 1356 1357 1358 /** 1359 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1360 * @qc: Storage for translated ATA taskfile 1361 * 1362 * Sets up an ATA taskfile to issue FLUSH CACHE or 1363 * FLUSH CACHE EXT. 1364 * 1365 * LOCKING: 1366 * spin_lock_irqsave(host lock) 1367 * 1368 * RETURNS: 1369 * Zero on success, non-zero on error. 1370 */ 1371 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1372 { 1373 struct ata_taskfile *tf = &qc->tf; 1374 1375 tf->flags |= ATA_TFLAG_DEVICE; 1376 tf->protocol = ATA_PROT_NODATA; 1377 1378 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1379 tf->command = ATA_CMD_FLUSH_EXT; 1380 else 1381 tf->command = ATA_CMD_FLUSH; 1382 1383 /* flush is critical for IO integrity, consider it an IO command */ 1384 qc->flags |= ATA_QCFLAG_IO; 1385 1386 return 0; 1387 } 1388 1389 /** 1390 * scsi_6_lba_len - Get LBA and transfer length 1391 * @cdb: SCSI command to translate 1392 * 1393 * Calculate LBA and transfer length for 6-byte commands. 1394 * 1395 * RETURNS: 1396 * @plba: the LBA 1397 * @plen: the transfer length 1398 */ 1399 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1400 { 1401 u64 lba = 0; 1402 u32 len; 1403 1404 VPRINTK("six-byte command\n"); 1405 1406 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1407 lba |= ((u64)cdb[2]) << 8; 1408 lba |= ((u64)cdb[3]); 1409 1410 len = cdb[4]; 1411 1412 *plba = lba; 1413 *plen = len; 1414 } 1415 1416 /** 1417 * scsi_10_lba_len - Get LBA and transfer length 1418 * @cdb: SCSI command to translate 1419 * 1420 * Calculate LBA and transfer length for 10-byte commands. 1421 * 1422 * RETURNS: 1423 * @plba: the LBA 1424 * @plen: the transfer length 1425 */ 1426 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1427 { 1428 u64 lba = 0; 1429 u32 len = 0; 1430 1431 VPRINTK("ten-byte command\n"); 1432 1433 lba |= ((u64)cdb[2]) << 24; 1434 lba |= ((u64)cdb[3]) << 16; 1435 lba |= ((u64)cdb[4]) << 8; 1436 lba |= ((u64)cdb[5]); 1437 1438 len |= ((u32)cdb[7]) << 8; 1439 len |= ((u32)cdb[8]); 1440 1441 *plba = lba; 1442 *plen = len; 1443 } 1444 1445 /** 1446 * scsi_16_lba_len - Get LBA and transfer length 1447 * @cdb: SCSI command to translate 1448 * 1449 * Calculate LBA and transfer length for 16-byte commands. 1450 * 1451 * RETURNS: 1452 * @plba: the LBA 1453 * @plen: the transfer length 1454 */ 1455 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1456 { 1457 u64 lba = 0; 1458 u32 len = 0; 1459 1460 VPRINTK("sixteen-byte command\n"); 1461 1462 lba |= ((u64)cdb[2]) << 56; 1463 lba |= ((u64)cdb[3]) << 48; 1464 lba |= ((u64)cdb[4]) << 40; 1465 lba |= ((u64)cdb[5]) << 32; 1466 lba |= ((u64)cdb[6]) << 24; 1467 lba |= ((u64)cdb[7]) << 16; 1468 lba |= ((u64)cdb[8]) << 8; 1469 lba |= ((u64)cdb[9]); 1470 1471 len |= ((u32)cdb[10]) << 24; 1472 len |= ((u32)cdb[11]) << 16; 1473 len |= ((u32)cdb[12]) << 8; 1474 len |= ((u32)cdb[13]); 1475 1476 *plba = lba; 1477 *plen = len; 1478 } 1479 1480 /** 1481 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1482 * @qc: Storage for translated ATA taskfile 1483 * 1484 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1485 * 1486 * LOCKING: 1487 * spin_lock_irqsave(host lock) 1488 * 1489 * RETURNS: 1490 * Zero on success, non-zero on error. 1491 */ 1492 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1493 { 1494 struct scsi_cmnd *scmd = qc->scsicmd; 1495 struct ata_taskfile *tf = &qc->tf; 1496 struct ata_device *dev = qc->dev; 1497 u64 dev_sectors = qc->dev->n_sectors; 1498 const u8 *cdb = scmd->cmnd; 1499 u64 block; 1500 u32 n_block; 1501 1502 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1503 tf->protocol = ATA_PROT_NODATA; 1504 1505 if (cdb[0] == VERIFY) { 1506 if (scmd->cmd_len < 10) 1507 goto invalid_fld; 1508 scsi_10_lba_len(cdb, &block, &n_block); 1509 } else if (cdb[0] == VERIFY_16) { 1510 if (scmd->cmd_len < 16) 1511 goto invalid_fld; 1512 scsi_16_lba_len(cdb, &block, &n_block); 1513 } else 1514 goto invalid_fld; 1515 1516 if (!n_block) 1517 goto nothing_to_do; 1518 if (block >= dev_sectors) 1519 goto out_of_range; 1520 if ((block + n_block) > dev_sectors) 1521 goto out_of_range; 1522 1523 if (dev->flags & ATA_DFLAG_LBA) { 1524 tf->flags |= ATA_TFLAG_LBA; 1525 1526 if (lba_28_ok(block, n_block)) { 1527 /* use LBA28 */ 1528 tf->command = ATA_CMD_VERIFY; 1529 tf->device |= (block >> 24) & 0xf; 1530 } else if (lba_48_ok(block, n_block)) { 1531 if (!(dev->flags & ATA_DFLAG_LBA48)) 1532 goto out_of_range; 1533 1534 /* use LBA48 */ 1535 tf->flags |= ATA_TFLAG_LBA48; 1536 tf->command = ATA_CMD_VERIFY_EXT; 1537 1538 tf->hob_nsect = (n_block >> 8) & 0xff; 1539 1540 tf->hob_lbah = (block >> 40) & 0xff; 1541 tf->hob_lbam = (block >> 32) & 0xff; 1542 tf->hob_lbal = (block >> 24) & 0xff; 1543 } else 1544 /* request too large even for LBA48 */ 1545 goto out_of_range; 1546 1547 tf->nsect = n_block & 0xff; 1548 1549 tf->lbah = (block >> 16) & 0xff; 1550 tf->lbam = (block >> 8) & 0xff; 1551 tf->lbal = block & 0xff; 1552 1553 tf->device |= ATA_LBA; 1554 } else { 1555 /* CHS */ 1556 u32 sect, head, cyl, track; 1557 1558 if (!lba_28_ok(block, n_block)) 1559 goto out_of_range; 1560 1561 /* Convert LBA to CHS */ 1562 track = (u32)block / dev->sectors; 1563 cyl = track / dev->heads; 1564 head = track % dev->heads; 1565 sect = (u32)block % dev->sectors + 1; 1566 1567 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1568 (u32)block, track, cyl, head, sect); 1569 1570 /* Check whether the converted CHS can fit. 1571 Cylinder: 0-65535 1572 Head: 0-15 1573 Sector: 1-255*/ 1574 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1575 goto out_of_range; 1576 1577 tf->command = ATA_CMD_VERIFY; 1578 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1579 tf->lbal = sect; 1580 tf->lbam = cyl; 1581 tf->lbah = cyl >> 8; 1582 tf->device |= head; 1583 } 1584 1585 return 0; 1586 1587 invalid_fld: 1588 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1589 /* "Invalid field in cbd" */ 1590 return 1; 1591 1592 out_of_range: 1593 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1594 /* "Logical Block Address out of range" */ 1595 return 1; 1596 1597 nothing_to_do: 1598 scmd->result = SAM_STAT_GOOD; 1599 return 1; 1600 } 1601 1602 /** 1603 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1604 * @qc: Storage for translated ATA taskfile 1605 * 1606 * Converts any of six SCSI read/write commands into the 1607 * ATA counterpart, including starting sector (LBA), 1608 * sector count, and taking into account the device's LBA48 1609 * support. 1610 * 1611 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1612 * %WRITE_16 are currently supported. 1613 * 1614 * LOCKING: 1615 * spin_lock_irqsave(host lock) 1616 * 1617 * RETURNS: 1618 * Zero on success, non-zero on error. 1619 */ 1620 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1621 { 1622 struct scsi_cmnd *scmd = qc->scsicmd; 1623 const u8 *cdb = scmd->cmnd; 1624 unsigned int tf_flags = 0; 1625 u64 block; 1626 u32 n_block; 1627 int rc; 1628 1629 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1630 tf_flags |= ATA_TFLAG_WRITE; 1631 1632 /* Calculate the SCSI LBA, transfer length and FUA. */ 1633 switch (cdb[0]) { 1634 case READ_10: 1635 case WRITE_10: 1636 if (unlikely(scmd->cmd_len < 10)) 1637 goto invalid_fld; 1638 scsi_10_lba_len(cdb, &block, &n_block); 1639 if (unlikely(cdb[1] & (1 << 3))) 1640 tf_flags |= ATA_TFLAG_FUA; 1641 break; 1642 case READ_6: 1643 case WRITE_6: 1644 if (unlikely(scmd->cmd_len < 6)) 1645 goto invalid_fld; 1646 scsi_6_lba_len(cdb, &block, &n_block); 1647 1648 /* for 6-byte r/w commands, transfer length 0 1649 * means 256 blocks of data, not 0 block. 1650 */ 1651 if (!n_block) 1652 n_block = 256; 1653 break; 1654 case READ_16: 1655 case WRITE_16: 1656 if (unlikely(scmd->cmd_len < 16)) 1657 goto invalid_fld; 1658 scsi_16_lba_len(cdb, &block, &n_block); 1659 if (unlikely(cdb[1] & (1 << 3))) 1660 tf_flags |= ATA_TFLAG_FUA; 1661 break; 1662 default: 1663 DPRINTK("no-byte command\n"); 1664 goto invalid_fld; 1665 } 1666 1667 /* Check and compose ATA command */ 1668 if (!n_block) 1669 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1670 * length 0 means transfer 0 block of data. 1671 * However, for ATA R/W commands, sector count 0 means 1672 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1673 * 1674 * WARNING: one or two older ATA drives treat 0 as 0... 1675 */ 1676 goto nothing_to_do; 1677 1678 qc->flags |= ATA_QCFLAG_IO; 1679 qc->nbytes = n_block * scmd->device->sector_size; 1680 1681 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1682 qc->tag); 1683 if (likely(rc == 0)) 1684 return 0; 1685 1686 if (rc == -ERANGE) 1687 goto out_of_range; 1688 /* treat all other errors as -EINVAL, fall through */ 1689 invalid_fld: 1690 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1691 /* "Invalid field in cbd" */ 1692 return 1; 1693 1694 out_of_range: 1695 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1696 /* "Logical Block Address out of range" */ 1697 return 1; 1698 1699 nothing_to_do: 1700 scmd->result = SAM_STAT_GOOD; 1701 return 1; 1702 } 1703 1704 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1705 { 1706 struct ata_port *ap = qc->ap; 1707 struct scsi_cmnd *cmd = qc->scsicmd; 1708 u8 *cdb = cmd->cmnd; 1709 int need_sense = (qc->err_mask != 0); 1710 1711 /* For ATA pass thru (SAT) commands, generate a sense block if 1712 * user mandated it or if there's an error. Note that if we 1713 * generate because the user forced us to, a check condition 1714 * is generated and the ATA register values are returned 1715 * whether the command completed successfully or not. If there 1716 * was no error, SK, ASC and ASCQ will all be zero. 1717 */ 1718 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1719 ((cdb[2] & 0x20) || need_sense)) { 1720 ata_gen_passthru_sense(qc); 1721 } else { 1722 if (!need_sense) { 1723 cmd->result = SAM_STAT_GOOD; 1724 } else { 1725 /* TODO: decide which descriptor format to use 1726 * for 48b LBA devices and call that here 1727 * instead of the fixed desc, which is only 1728 * good for smaller LBA (and maybe CHS?) 1729 * devices. 1730 */ 1731 ata_gen_ata_sense(qc); 1732 } 1733 } 1734 1735 if (need_sense && !ap->ops->error_handler) 1736 ata_dump_status(ap->print_id, &qc->result_tf); 1737 1738 qc->scsidone(cmd); 1739 1740 ata_qc_free(qc); 1741 } 1742 1743 /** 1744 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1745 * @dev: ATA device to which the command is addressed 1746 * @cmd: SCSI command to execute 1747 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1748 * 1749 * Our ->queuecommand() function has decided that the SCSI 1750 * command issued can be directly translated into an ATA 1751 * command, rather than handled internally. 1752 * 1753 * This function sets up an ata_queued_cmd structure for the 1754 * SCSI command, and sends that ata_queued_cmd to the hardware. 1755 * 1756 * The xlat_func argument (actor) returns 0 if ready to execute 1757 * ATA command, else 1 to finish translation. If 1 is returned 1758 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1759 * to be set reflecting an error condition or clean (early) 1760 * termination. 1761 * 1762 * LOCKING: 1763 * spin_lock_irqsave(host lock) 1764 * 1765 * RETURNS: 1766 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1767 * needs to be deferred. 1768 */ 1769 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1770 ata_xlat_func_t xlat_func) 1771 { 1772 struct ata_port *ap = dev->link->ap; 1773 struct ata_queued_cmd *qc; 1774 int rc; 1775 1776 VPRINTK("ENTER\n"); 1777 1778 qc = ata_scsi_qc_new(dev, cmd); 1779 if (!qc) 1780 goto err_mem; 1781 1782 /* data is present; dma-map it */ 1783 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1784 cmd->sc_data_direction == DMA_TO_DEVICE) { 1785 if (unlikely(scsi_bufflen(cmd) < 1)) { 1786 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1787 goto err_did; 1788 } 1789 1790 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1791 1792 qc->dma_dir = cmd->sc_data_direction; 1793 } 1794 1795 qc->complete_fn = ata_scsi_qc_complete; 1796 1797 if (xlat_func(qc)) 1798 goto early_finish; 1799 1800 if (ap->ops->qc_defer) { 1801 if ((rc = ap->ops->qc_defer(qc))) 1802 goto defer; 1803 } 1804 1805 /* select device, send command to hardware */ 1806 ata_qc_issue(qc); 1807 1808 VPRINTK("EXIT\n"); 1809 return 0; 1810 1811 early_finish: 1812 ata_qc_free(qc); 1813 cmd->scsi_done(cmd); 1814 DPRINTK("EXIT - early finish (good or error)\n"); 1815 return 0; 1816 1817 err_did: 1818 ata_qc_free(qc); 1819 cmd->result = (DID_ERROR << 16); 1820 cmd->scsi_done(cmd); 1821 err_mem: 1822 DPRINTK("EXIT - internal\n"); 1823 return 0; 1824 1825 defer: 1826 ata_qc_free(qc); 1827 DPRINTK("EXIT - defer\n"); 1828 if (rc == ATA_DEFER_LINK) 1829 return SCSI_MLQUEUE_DEVICE_BUSY; 1830 else 1831 return SCSI_MLQUEUE_HOST_BUSY; 1832 } 1833 1834 /** 1835 * ata_scsi_rbuf_get - Map response buffer. 1836 * @cmd: SCSI command containing buffer to be mapped. 1837 * @flags: unsigned long variable to store irq enable status 1838 * @copy_in: copy in from user buffer 1839 * 1840 * Prepare buffer for simulated SCSI commands. 1841 * 1842 * LOCKING: 1843 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1844 * 1845 * RETURNS: 1846 * Pointer to response buffer. 1847 */ 1848 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1849 unsigned long *flags) 1850 { 1851 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1852 1853 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1854 if (copy_in) 1855 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1856 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1857 return ata_scsi_rbuf; 1858 } 1859 1860 /** 1861 * ata_scsi_rbuf_put - Unmap response buffer. 1862 * @cmd: SCSI command containing buffer to be unmapped. 1863 * @copy_out: copy out result 1864 * @flags: @flags passed to ata_scsi_rbuf_get() 1865 * 1866 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1867 * @copy_back is true. 1868 * 1869 * LOCKING: 1870 * Unlocks ata_scsi_rbuf_lock. 1871 */ 1872 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1873 unsigned long *flags) 1874 { 1875 if (copy_out) 1876 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1877 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1878 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1879 } 1880 1881 /** 1882 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1883 * @args: device IDENTIFY data / SCSI command of interest. 1884 * @actor: Callback hook for desired SCSI command simulator 1885 * 1886 * Takes care of the hard work of simulating a SCSI command... 1887 * Mapping the response buffer, calling the command's handler, 1888 * and handling the handler's return value. This return value 1889 * indicates whether the handler wishes the SCSI command to be 1890 * completed successfully (0), or not (in which case cmd->result 1891 * and sense buffer are assumed to be set). 1892 * 1893 * LOCKING: 1894 * spin_lock_irqsave(host lock) 1895 */ 1896 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1897 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1898 { 1899 u8 *rbuf; 1900 unsigned int rc; 1901 struct scsi_cmnd *cmd = args->cmd; 1902 unsigned long flags; 1903 1904 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1905 rc = actor(args, rbuf); 1906 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1907 1908 if (rc == 0) 1909 cmd->result = SAM_STAT_GOOD; 1910 args->done(cmd); 1911 } 1912 1913 /** 1914 * ata_scsiop_inq_std - Simulate INQUIRY command 1915 * @args: device IDENTIFY data / SCSI command of interest. 1916 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1917 * 1918 * Returns standard device identification data associated 1919 * with non-VPD INQUIRY command output. 1920 * 1921 * LOCKING: 1922 * spin_lock_irqsave(host lock) 1923 */ 1924 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1925 { 1926 const u8 versions[] = { 1927 0x60, /* SAM-3 (no version claimed) */ 1928 1929 0x03, 1930 0x20, /* SBC-2 (no version claimed) */ 1931 1932 0x02, 1933 0x60 /* SPC-3 (no version claimed) */ 1934 }; 1935 u8 hdr[] = { 1936 TYPE_DISK, 1937 0, 1938 0x5, /* claim SPC-3 version compatibility */ 1939 2, 1940 95 - 4 1941 }; 1942 1943 VPRINTK("ENTER\n"); 1944 1945 /* set scsi removeable (RMB) bit per ata bit */ 1946 if (ata_id_removeable(args->id)) 1947 hdr[1] |= (1 << 7); 1948 1949 memcpy(rbuf, hdr, sizeof(hdr)); 1950 memcpy(&rbuf[8], "ATA ", 8); 1951 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1952 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1953 1954 if (rbuf[32] == 0 || rbuf[32] == ' ') 1955 memcpy(&rbuf[32], "n/a ", 4); 1956 1957 memcpy(rbuf + 59, versions, sizeof(versions)); 1958 1959 return 0; 1960 } 1961 1962 /** 1963 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1964 * @args: device IDENTIFY data / SCSI command of interest. 1965 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1966 * 1967 * Returns list of inquiry VPD pages available. 1968 * 1969 * LOCKING: 1970 * spin_lock_irqsave(host lock) 1971 */ 1972 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1973 { 1974 const u8 pages[] = { 1975 0x00, /* page 0x00, this page */ 1976 0x80, /* page 0x80, unit serial no page */ 1977 0x83, /* page 0x83, device ident page */ 1978 0x89, /* page 0x89, ata info page */ 1979 0xb0, /* page 0xb0, block limits page */ 1980 0xb1, /* page 0xb1, block device characteristics page */ 1981 0xb2, /* page 0xb2, thin provisioning page */ 1982 }; 1983 1984 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1985 memcpy(rbuf + 4, pages, sizeof(pages)); 1986 return 0; 1987 } 1988 1989 /** 1990 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1991 * @args: device IDENTIFY data / SCSI command of interest. 1992 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1993 * 1994 * Returns ATA device serial number. 1995 * 1996 * LOCKING: 1997 * spin_lock_irqsave(host lock) 1998 */ 1999 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2000 { 2001 const u8 hdr[] = { 2002 0, 2003 0x80, /* this page code */ 2004 0, 2005 ATA_ID_SERNO_LEN, /* page len */ 2006 }; 2007 2008 memcpy(rbuf, hdr, sizeof(hdr)); 2009 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2010 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2011 return 0; 2012 } 2013 2014 /** 2015 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2016 * @args: device IDENTIFY data / SCSI command of interest. 2017 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2018 * 2019 * Yields two logical unit device identification designators: 2020 * - vendor specific ASCII containing the ATA serial number 2021 * - SAT defined "t10 vendor id based" containing ASCII vendor 2022 * name ("ATA "), model and serial numbers. 2023 * 2024 * LOCKING: 2025 * spin_lock_irqsave(host lock) 2026 */ 2027 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2028 { 2029 const int sat_model_serial_desc_len = 68; 2030 int num; 2031 2032 rbuf[1] = 0x83; /* this page code */ 2033 num = 4; 2034 2035 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2036 rbuf[num + 0] = 2; 2037 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2038 num += 4; 2039 ata_id_string(args->id, (unsigned char *) rbuf + num, 2040 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2041 num += ATA_ID_SERNO_LEN; 2042 2043 /* SAT defined lu model and serial numbers descriptor */ 2044 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2045 rbuf[num + 0] = 2; 2046 rbuf[num + 1] = 1; 2047 rbuf[num + 3] = sat_model_serial_desc_len; 2048 num += 4; 2049 memcpy(rbuf + num, "ATA ", 8); 2050 num += 8; 2051 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2052 ATA_ID_PROD_LEN); 2053 num += ATA_ID_PROD_LEN; 2054 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2055 ATA_ID_SERNO_LEN); 2056 num += ATA_ID_SERNO_LEN; 2057 2058 if (ata_id_has_wwn(args->id)) { 2059 /* SAT defined lu world wide name */ 2060 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2061 rbuf[num + 0] = 1; 2062 rbuf[num + 1] = 3; 2063 rbuf[num + 3] = ATA_ID_WWN_LEN; 2064 num += 4; 2065 ata_id_string(args->id, (unsigned char *) rbuf + num, 2066 ATA_ID_WWN, ATA_ID_WWN_LEN); 2067 num += ATA_ID_WWN_LEN; 2068 } 2069 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2070 return 0; 2071 } 2072 2073 /** 2074 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2075 * @args: device IDENTIFY data / SCSI command of interest. 2076 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2077 * 2078 * Yields SAT-specified ATA VPD page. 2079 * 2080 * LOCKING: 2081 * spin_lock_irqsave(host lock) 2082 */ 2083 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2084 { 2085 struct ata_taskfile tf; 2086 2087 memset(&tf, 0, sizeof(tf)); 2088 2089 rbuf[1] = 0x89; /* our page code */ 2090 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2091 rbuf[3] = (0x238 & 0xff); 2092 2093 memcpy(&rbuf[8], "linux ", 8); 2094 memcpy(&rbuf[16], "libata ", 16); 2095 memcpy(&rbuf[32], DRV_VERSION, 4); 2096 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2097 2098 /* we don't store the ATA device signature, so we fake it */ 2099 2100 tf.command = ATA_DRDY; /* really, this is Status reg */ 2101 tf.lbal = 0x1; 2102 tf.nsect = 0x1; 2103 2104 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2105 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2106 2107 rbuf[56] = ATA_CMD_ID_ATA; 2108 2109 memcpy(&rbuf[60], &args->id[0], 512); 2110 return 0; 2111 } 2112 2113 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2114 { 2115 u16 min_io_sectors; 2116 2117 rbuf[1] = 0xb0; 2118 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2119 2120 /* 2121 * Optimal transfer length granularity. 2122 * 2123 * This is always one physical block, but for disks with a smaller 2124 * logical than physical sector size we need to figure out what the 2125 * latter is. 2126 */ 2127 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2128 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2129 2130 /* 2131 * Optimal unmap granularity. 2132 * 2133 * The ATA spec doesn't even know about a granularity or alignment 2134 * for the TRIM command. We can leave away most of the unmap related 2135 * VPD page entries, but we have specifify a granularity to signal 2136 * that we support some form of unmap - in thise case via WRITE SAME 2137 * with the unmap bit set. 2138 */ 2139 if (ata_id_has_trim(args->id)) { 2140 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2141 put_unaligned_be32(1, &rbuf[28]); 2142 } 2143 2144 return 0; 2145 } 2146 2147 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2148 { 2149 int form_factor = ata_id_form_factor(args->id); 2150 int media_rotation_rate = ata_id_rotation_rate(args->id); 2151 2152 rbuf[1] = 0xb1; 2153 rbuf[3] = 0x3c; 2154 rbuf[4] = media_rotation_rate >> 8; 2155 rbuf[5] = media_rotation_rate; 2156 rbuf[7] = form_factor; 2157 2158 return 0; 2159 } 2160 2161 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2162 { 2163 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2164 rbuf[1] = 0xb2; 2165 rbuf[3] = 0x4; 2166 rbuf[5] = 1 << 6; /* TPWS */ 2167 2168 return 0; 2169 } 2170 2171 /** 2172 * ata_scsiop_noop - Command handler that simply returns success. 2173 * @args: device IDENTIFY data / SCSI command of interest. 2174 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2175 * 2176 * No operation. Simply returns success to caller, to indicate 2177 * that the caller should successfully complete this SCSI command. 2178 * 2179 * LOCKING: 2180 * spin_lock_irqsave(host lock) 2181 */ 2182 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2183 { 2184 VPRINTK("ENTER\n"); 2185 return 0; 2186 } 2187 2188 /** 2189 * ata_msense_caching - Simulate MODE SENSE caching info page 2190 * @id: device IDENTIFY data 2191 * @buf: output buffer 2192 * 2193 * Generate a caching info page, which conditionally indicates 2194 * write caching to the SCSI layer, depending on device 2195 * capabilities. 2196 * 2197 * LOCKING: 2198 * None. 2199 */ 2200 static unsigned int ata_msense_caching(u16 *id, u8 *buf) 2201 { 2202 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage)); 2203 if (ata_id_wcache_enabled(id)) 2204 buf[2] |= (1 << 2); /* write cache enable */ 2205 if (!ata_id_rahead_enabled(id)) 2206 buf[12] |= (1 << 5); /* disable read ahead */ 2207 return sizeof(def_cache_mpage); 2208 } 2209 2210 /** 2211 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2212 * @buf: output buffer 2213 * 2214 * Generate a generic MODE SENSE control mode page. 2215 * 2216 * LOCKING: 2217 * None. 2218 */ 2219 static unsigned int ata_msense_ctl_mode(u8 *buf) 2220 { 2221 memcpy(buf, def_control_mpage, sizeof(def_control_mpage)); 2222 return sizeof(def_control_mpage); 2223 } 2224 2225 /** 2226 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2227 * @buf: output buffer 2228 * 2229 * Generate a generic MODE SENSE r/w error recovery page. 2230 * 2231 * LOCKING: 2232 * None. 2233 */ 2234 static unsigned int ata_msense_rw_recovery(u8 *buf) 2235 { 2236 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage)); 2237 return sizeof(def_rw_recovery_mpage); 2238 } 2239 2240 /* 2241 * We can turn this into a real blacklist if it's needed, for now just 2242 * blacklist any Maxtor BANC1G10 revision firmware 2243 */ 2244 static int ata_dev_supports_fua(u16 *id) 2245 { 2246 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2247 2248 if (!libata_fua) 2249 return 0; 2250 if (!ata_id_has_fua(id)) 2251 return 0; 2252 2253 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2254 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2255 2256 if (strcmp(model, "Maxtor")) 2257 return 1; 2258 if (strcmp(fw, "BANC1G10")) 2259 return 1; 2260 2261 return 0; /* blacklisted */ 2262 } 2263 2264 /** 2265 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2266 * @args: device IDENTIFY data / SCSI command of interest. 2267 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2268 * 2269 * Simulate MODE SENSE commands. Assume this is invoked for direct 2270 * access devices (e.g. disks) only. There should be no block 2271 * descriptor for other device types. 2272 * 2273 * LOCKING: 2274 * spin_lock_irqsave(host lock) 2275 */ 2276 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2277 { 2278 struct ata_device *dev = args->dev; 2279 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2280 const u8 sat_blk_desc[] = { 2281 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2282 0, 2283 0, 0x2, 0x0 /* block length: 512 bytes */ 2284 }; 2285 u8 pg, spg; 2286 unsigned int ebd, page_control, six_byte; 2287 u8 dpofua; 2288 2289 VPRINTK("ENTER\n"); 2290 2291 six_byte = (scsicmd[0] == MODE_SENSE); 2292 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2293 /* 2294 * LLBA bit in msense(10) ignored (compliant) 2295 */ 2296 2297 page_control = scsicmd[2] >> 6; 2298 switch (page_control) { 2299 case 0: /* current */ 2300 break; /* supported */ 2301 case 3: /* saved */ 2302 goto saving_not_supp; 2303 case 1: /* changeable */ 2304 case 2: /* defaults */ 2305 default: 2306 goto invalid_fld; 2307 } 2308 2309 if (six_byte) 2310 p += 4 + (ebd ? 8 : 0); 2311 else 2312 p += 8 + (ebd ? 8 : 0); 2313 2314 pg = scsicmd[2] & 0x3f; 2315 spg = scsicmd[3]; 2316 /* 2317 * No mode subpages supported (yet) but asking for _all_ 2318 * subpages may be valid 2319 */ 2320 if (spg && (spg != ALL_SUB_MPAGES)) 2321 goto invalid_fld; 2322 2323 switch(pg) { 2324 case RW_RECOVERY_MPAGE: 2325 p += ata_msense_rw_recovery(p); 2326 break; 2327 2328 case CACHE_MPAGE: 2329 p += ata_msense_caching(args->id, p); 2330 break; 2331 2332 case CONTROL_MPAGE: 2333 p += ata_msense_ctl_mode(p); 2334 break; 2335 2336 case ALL_MPAGES: 2337 p += ata_msense_rw_recovery(p); 2338 p += ata_msense_caching(args->id, p); 2339 p += ata_msense_ctl_mode(p); 2340 break; 2341 2342 default: /* invalid page code */ 2343 goto invalid_fld; 2344 } 2345 2346 dpofua = 0; 2347 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2348 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2349 dpofua = 1 << 4; 2350 2351 if (six_byte) { 2352 rbuf[0] = p - rbuf - 1; 2353 rbuf[2] |= dpofua; 2354 if (ebd) { 2355 rbuf[3] = sizeof(sat_blk_desc); 2356 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2357 } 2358 } else { 2359 unsigned int output_len = p - rbuf - 2; 2360 2361 rbuf[0] = output_len >> 8; 2362 rbuf[1] = output_len; 2363 rbuf[3] |= dpofua; 2364 if (ebd) { 2365 rbuf[7] = sizeof(sat_blk_desc); 2366 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2367 } 2368 } 2369 return 0; 2370 2371 invalid_fld: 2372 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2373 /* "Invalid field in cbd" */ 2374 return 1; 2375 2376 saving_not_supp: 2377 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2378 /* "Saving parameters not supported" */ 2379 return 1; 2380 } 2381 2382 /** 2383 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2384 * @args: device IDENTIFY data / SCSI command of interest. 2385 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2386 * 2387 * Simulate READ CAPACITY commands. 2388 * 2389 * LOCKING: 2390 * None. 2391 */ 2392 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2393 { 2394 struct ata_device *dev = args->dev; 2395 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2396 u32 sector_size; /* physical sector size in bytes */ 2397 u8 log2_per_phys; 2398 u16 lowest_aligned; 2399 2400 sector_size = ata_id_logical_sector_size(dev->id); 2401 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2402 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2403 2404 VPRINTK("ENTER\n"); 2405 2406 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2407 if (last_lba >= 0xffffffffULL) 2408 last_lba = 0xffffffff; 2409 2410 /* sector count, 32-bit */ 2411 rbuf[0] = last_lba >> (8 * 3); 2412 rbuf[1] = last_lba >> (8 * 2); 2413 rbuf[2] = last_lba >> (8 * 1); 2414 rbuf[3] = last_lba; 2415 2416 /* sector size */ 2417 rbuf[4] = sector_size >> (8 * 3); 2418 rbuf[5] = sector_size >> (8 * 2); 2419 rbuf[6] = sector_size >> (8 * 1); 2420 rbuf[7] = sector_size; 2421 } else { 2422 /* sector count, 64-bit */ 2423 rbuf[0] = last_lba >> (8 * 7); 2424 rbuf[1] = last_lba >> (8 * 6); 2425 rbuf[2] = last_lba >> (8 * 5); 2426 rbuf[3] = last_lba >> (8 * 4); 2427 rbuf[4] = last_lba >> (8 * 3); 2428 rbuf[5] = last_lba >> (8 * 2); 2429 rbuf[6] = last_lba >> (8 * 1); 2430 rbuf[7] = last_lba; 2431 2432 /* sector size */ 2433 rbuf[ 8] = sector_size >> (8 * 3); 2434 rbuf[ 9] = sector_size >> (8 * 2); 2435 rbuf[10] = sector_size >> (8 * 1); 2436 rbuf[11] = sector_size; 2437 2438 rbuf[12] = 0; 2439 rbuf[13] = log2_per_phys; 2440 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2441 rbuf[15] = lowest_aligned; 2442 2443 if (ata_id_has_trim(args->id)) { 2444 rbuf[14] |= 0x80; /* TPE */ 2445 2446 if (ata_id_has_zero_after_trim(args->id)) 2447 rbuf[14] |= 0x40; /* TPRZ */ 2448 } 2449 } 2450 2451 return 0; 2452 } 2453 2454 /** 2455 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2456 * @args: device IDENTIFY data / SCSI command of interest. 2457 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2458 * 2459 * Simulate REPORT LUNS command. 2460 * 2461 * LOCKING: 2462 * spin_lock_irqsave(host lock) 2463 */ 2464 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2465 { 2466 VPRINTK("ENTER\n"); 2467 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2468 2469 return 0; 2470 } 2471 2472 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2473 { 2474 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2475 /* FIXME: not quite right; we don't want the 2476 * translation of taskfile registers into 2477 * a sense descriptors, since that's only 2478 * correct for ATA, not ATAPI 2479 */ 2480 ata_gen_passthru_sense(qc); 2481 } 2482 2483 qc->scsidone(qc->scsicmd); 2484 ata_qc_free(qc); 2485 } 2486 2487 /* is it pointless to prefer PIO for "safety reasons"? */ 2488 static inline int ata_pio_use_silly(struct ata_port *ap) 2489 { 2490 return (ap->flags & ATA_FLAG_PIO_DMA); 2491 } 2492 2493 static void atapi_request_sense(struct ata_queued_cmd *qc) 2494 { 2495 struct ata_port *ap = qc->ap; 2496 struct scsi_cmnd *cmd = qc->scsicmd; 2497 2498 DPRINTK("ATAPI request sense\n"); 2499 2500 /* FIXME: is this needed? */ 2501 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2502 2503 #ifdef CONFIG_ATA_SFF 2504 if (ap->ops->sff_tf_read) 2505 ap->ops->sff_tf_read(ap, &qc->tf); 2506 #endif 2507 2508 /* fill these in, for the case where they are -not- overwritten */ 2509 cmd->sense_buffer[0] = 0x70; 2510 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2511 2512 ata_qc_reinit(qc); 2513 2514 /* setup sg table and init transfer direction */ 2515 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2516 ata_sg_init(qc, &qc->sgent, 1); 2517 qc->dma_dir = DMA_FROM_DEVICE; 2518 2519 memset(&qc->cdb, 0, qc->dev->cdb_len); 2520 qc->cdb[0] = REQUEST_SENSE; 2521 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2522 2523 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2524 qc->tf.command = ATA_CMD_PACKET; 2525 2526 if (ata_pio_use_silly(ap)) { 2527 qc->tf.protocol = ATAPI_PROT_DMA; 2528 qc->tf.feature |= ATAPI_PKT_DMA; 2529 } else { 2530 qc->tf.protocol = ATAPI_PROT_PIO; 2531 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2532 qc->tf.lbah = 0; 2533 } 2534 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2535 2536 qc->complete_fn = atapi_sense_complete; 2537 2538 ata_qc_issue(qc); 2539 2540 DPRINTK("EXIT\n"); 2541 } 2542 2543 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2544 { 2545 struct scsi_cmnd *cmd = qc->scsicmd; 2546 unsigned int err_mask = qc->err_mask; 2547 2548 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2549 2550 /* handle completion from new EH */ 2551 if (unlikely(qc->ap->ops->error_handler && 2552 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2553 2554 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2555 /* FIXME: not quite right; we don't want the 2556 * translation of taskfile registers into a 2557 * sense descriptors, since that's only 2558 * correct for ATA, not ATAPI 2559 */ 2560 ata_gen_passthru_sense(qc); 2561 } 2562 2563 /* SCSI EH automatically locks door if sdev->locked is 2564 * set. Sometimes door lock request continues to 2565 * fail, for example, when no media is present. This 2566 * creates a loop - SCSI EH issues door lock which 2567 * fails and gets invoked again to acquire sense data 2568 * for the failed command. 2569 * 2570 * If door lock fails, always clear sdev->locked to 2571 * avoid this infinite loop. 2572 * 2573 * This may happen before SCSI scan is complete. Make 2574 * sure qc->dev->sdev isn't NULL before dereferencing. 2575 */ 2576 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2577 qc->dev->sdev->locked = 0; 2578 2579 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2580 qc->scsidone(cmd); 2581 ata_qc_free(qc); 2582 return; 2583 } 2584 2585 /* successful completion or old EH failure path */ 2586 if (unlikely(err_mask & AC_ERR_DEV)) { 2587 cmd->result = SAM_STAT_CHECK_CONDITION; 2588 atapi_request_sense(qc); 2589 return; 2590 } else if (unlikely(err_mask)) { 2591 /* FIXME: not quite right; we don't want the 2592 * translation of taskfile registers into 2593 * a sense descriptors, since that's only 2594 * correct for ATA, not ATAPI 2595 */ 2596 ata_gen_passthru_sense(qc); 2597 } else { 2598 u8 *scsicmd = cmd->cmnd; 2599 2600 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2601 unsigned long flags; 2602 u8 *buf; 2603 2604 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2605 2606 /* ATAPI devices typically report zero for their SCSI version, 2607 * and sometimes deviate from the spec WRT response data 2608 * format. If SCSI version is reported as zero like normal, 2609 * then we make the following fixups: 1) Fake MMC-5 version, 2610 * to indicate to the Linux scsi midlayer this is a modern 2611 * device. 2) Ensure response data format / ATAPI information 2612 * are always correct. 2613 */ 2614 if (buf[2] == 0) { 2615 buf[2] = 0x5; 2616 buf[3] = 0x32; 2617 } 2618 2619 ata_scsi_rbuf_put(cmd, true, &flags); 2620 } 2621 2622 cmd->result = SAM_STAT_GOOD; 2623 } 2624 2625 qc->scsidone(cmd); 2626 ata_qc_free(qc); 2627 } 2628 /** 2629 * atapi_xlat - Initialize PACKET taskfile 2630 * @qc: command structure to be initialized 2631 * 2632 * LOCKING: 2633 * spin_lock_irqsave(host lock) 2634 * 2635 * RETURNS: 2636 * Zero on success, non-zero on failure. 2637 */ 2638 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2639 { 2640 struct scsi_cmnd *scmd = qc->scsicmd; 2641 struct ata_device *dev = qc->dev; 2642 int nodata = (scmd->sc_data_direction == DMA_NONE); 2643 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2644 unsigned int nbytes; 2645 2646 memset(qc->cdb, 0, dev->cdb_len); 2647 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2648 2649 qc->complete_fn = atapi_qc_complete; 2650 2651 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2652 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2653 qc->tf.flags |= ATA_TFLAG_WRITE; 2654 DPRINTK("direction: write\n"); 2655 } 2656 2657 qc->tf.command = ATA_CMD_PACKET; 2658 ata_qc_set_pc_nbytes(qc); 2659 2660 /* check whether ATAPI DMA is safe */ 2661 if (!nodata && !using_pio && atapi_check_dma(qc)) 2662 using_pio = 1; 2663 2664 /* Some controller variants snoop this value for Packet 2665 * transfers to do state machine and FIFO management. Thus we 2666 * want to set it properly, and for DMA where it is 2667 * effectively meaningless. 2668 */ 2669 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2670 2671 /* Most ATAPI devices which honor transfer chunk size don't 2672 * behave according to the spec when odd chunk size which 2673 * matches the transfer length is specified. If the number of 2674 * bytes to transfer is 2n+1. According to the spec, what 2675 * should happen is to indicate that 2n+1 is going to be 2676 * transferred and transfer 2n+2 bytes where the last byte is 2677 * padding. 2678 * 2679 * In practice, this doesn't happen. ATAPI devices first 2680 * indicate and transfer 2n bytes and then indicate and 2681 * transfer 2 bytes where the last byte is padding. 2682 * 2683 * This inconsistency confuses several controllers which 2684 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2685 * These controllers use actual number of transferred bytes to 2686 * update DMA poitner and transfer of 4n+2 bytes make those 2687 * controller push DMA pointer by 4n+4 bytes because SATA data 2688 * FISes are aligned to 4 bytes. This causes data corruption 2689 * and buffer overrun. 2690 * 2691 * Always setting nbytes to even number solves this problem 2692 * because then ATAPI devices don't have to split data at 2n 2693 * boundaries. 2694 */ 2695 if (nbytes & 0x1) 2696 nbytes++; 2697 2698 qc->tf.lbam = (nbytes & 0xFF); 2699 qc->tf.lbah = (nbytes >> 8); 2700 2701 if (nodata) 2702 qc->tf.protocol = ATAPI_PROT_NODATA; 2703 else if (using_pio) 2704 qc->tf.protocol = ATAPI_PROT_PIO; 2705 else { 2706 /* DMA data xfer */ 2707 qc->tf.protocol = ATAPI_PROT_DMA; 2708 qc->tf.feature |= ATAPI_PKT_DMA; 2709 2710 if ((dev->flags & ATA_DFLAG_DMADIR) && 2711 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2712 /* some SATA bridges need us to indicate data xfer direction */ 2713 qc->tf.feature |= ATAPI_DMADIR; 2714 } 2715 2716 2717 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2718 as ATAPI tape drives don't get this right otherwise */ 2719 return 0; 2720 } 2721 2722 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2723 { 2724 if (!sata_pmp_attached(ap)) { 2725 if (likely(devno < ata_link_max_devices(&ap->link))) 2726 return &ap->link.device[devno]; 2727 } else { 2728 if (likely(devno < ap->nr_pmp_links)) 2729 return &ap->pmp_link[devno].device[0]; 2730 } 2731 2732 return NULL; 2733 } 2734 2735 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2736 const struct scsi_device *scsidev) 2737 { 2738 int devno; 2739 2740 /* skip commands not addressed to targets we simulate */ 2741 if (!sata_pmp_attached(ap)) { 2742 if (unlikely(scsidev->channel || scsidev->lun)) 2743 return NULL; 2744 devno = scsidev->id; 2745 } else { 2746 if (unlikely(scsidev->id || scsidev->lun)) 2747 return NULL; 2748 devno = scsidev->channel; 2749 } 2750 2751 return ata_find_dev(ap, devno); 2752 } 2753 2754 /** 2755 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2756 * @ap: ATA port to which the device is attached 2757 * @scsidev: SCSI device from which we derive the ATA device 2758 * 2759 * Given various information provided in struct scsi_cmnd, 2760 * map that onto an ATA bus, and using that mapping 2761 * determine which ata_device is associated with the 2762 * SCSI command to be sent. 2763 * 2764 * LOCKING: 2765 * spin_lock_irqsave(host lock) 2766 * 2767 * RETURNS: 2768 * Associated ATA device, or %NULL if not found. 2769 */ 2770 static struct ata_device * 2771 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2772 { 2773 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2774 2775 if (unlikely(!dev || !ata_dev_enabled(dev))) 2776 return NULL; 2777 2778 return dev; 2779 } 2780 2781 /* 2782 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2783 * @byte1: Byte 1 from pass-thru CDB. 2784 * 2785 * RETURNS: 2786 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2787 */ 2788 static u8 2789 ata_scsi_map_proto(u8 byte1) 2790 { 2791 switch((byte1 & 0x1e) >> 1) { 2792 case 3: /* Non-data */ 2793 return ATA_PROT_NODATA; 2794 2795 case 6: /* DMA */ 2796 case 10: /* UDMA Data-in */ 2797 case 11: /* UDMA Data-Out */ 2798 return ATA_PROT_DMA; 2799 2800 case 4: /* PIO Data-in */ 2801 case 5: /* PIO Data-out */ 2802 return ATA_PROT_PIO; 2803 2804 case 0: /* Hard Reset */ 2805 case 1: /* SRST */ 2806 case 8: /* Device Diagnostic */ 2807 case 9: /* Device Reset */ 2808 case 7: /* DMA Queued */ 2809 case 12: /* FPDMA */ 2810 case 15: /* Return Response Info */ 2811 default: /* Reserved */ 2812 break; 2813 } 2814 2815 return ATA_PROT_UNKNOWN; 2816 } 2817 2818 /** 2819 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2820 * @qc: command structure to be initialized 2821 * 2822 * Handles either 12 or 16-byte versions of the CDB. 2823 * 2824 * RETURNS: 2825 * Zero on success, non-zero on failure. 2826 */ 2827 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2828 { 2829 struct ata_taskfile *tf = &(qc->tf); 2830 struct scsi_cmnd *scmd = qc->scsicmd; 2831 struct ata_device *dev = qc->dev; 2832 const u8 *cdb = scmd->cmnd; 2833 2834 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2835 goto invalid_fld; 2836 2837 /* 2838 * 12 and 16 byte CDBs use different offsets to 2839 * provide the various register values. 2840 */ 2841 if (cdb[0] == ATA_16) { 2842 /* 2843 * 16-byte CDB - may contain extended commands. 2844 * 2845 * If that is the case, copy the upper byte register values. 2846 */ 2847 if (cdb[1] & 0x01) { 2848 tf->hob_feature = cdb[3]; 2849 tf->hob_nsect = cdb[5]; 2850 tf->hob_lbal = cdb[7]; 2851 tf->hob_lbam = cdb[9]; 2852 tf->hob_lbah = cdb[11]; 2853 tf->flags |= ATA_TFLAG_LBA48; 2854 } else 2855 tf->flags &= ~ATA_TFLAG_LBA48; 2856 2857 /* 2858 * Always copy low byte, device and command registers. 2859 */ 2860 tf->feature = cdb[4]; 2861 tf->nsect = cdb[6]; 2862 tf->lbal = cdb[8]; 2863 tf->lbam = cdb[10]; 2864 tf->lbah = cdb[12]; 2865 tf->device = cdb[13]; 2866 tf->command = cdb[14]; 2867 } else { 2868 /* 2869 * 12-byte CDB - incapable of extended commands. 2870 */ 2871 tf->flags &= ~ATA_TFLAG_LBA48; 2872 2873 tf->feature = cdb[3]; 2874 tf->nsect = cdb[4]; 2875 tf->lbal = cdb[5]; 2876 tf->lbam = cdb[6]; 2877 tf->lbah = cdb[7]; 2878 tf->device = cdb[8]; 2879 tf->command = cdb[9]; 2880 } 2881 2882 /* enforce correct master/slave bit */ 2883 tf->device = dev->devno ? 2884 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2885 2886 switch (tf->command) { 2887 /* READ/WRITE LONG use a non-standard sect_size */ 2888 case ATA_CMD_READ_LONG: 2889 case ATA_CMD_READ_LONG_ONCE: 2890 case ATA_CMD_WRITE_LONG: 2891 case ATA_CMD_WRITE_LONG_ONCE: 2892 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2893 goto invalid_fld; 2894 qc->sect_size = scsi_bufflen(scmd); 2895 break; 2896 2897 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2898 case ATA_CMD_CFA_WRITE_NE: 2899 case ATA_CMD_CFA_TRANS_SECT: 2900 case ATA_CMD_CFA_WRITE_MULT_NE: 2901 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2902 case ATA_CMD_READ: 2903 case ATA_CMD_READ_EXT: 2904 case ATA_CMD_READ_QUEUED: 2905 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2906 case ATA_CMD_FPDMA_READ: 2907 case ATA_CMD_READ_MULTI: 2908 case ATA_CMD_READ_MULTI_EXT: 2909 case ATA_CMD_PIO_READ: 2910 case ATA_CMD_PIO_READ_EXT: 2911 case ATA_CMD_READ_STREAM_DMA_EXT: 2912 case ATA_CMD_READ_STREAM_EXT: 2913 case ATA_CMD_VERIFY: 2914 case ATA_CMD_VERIFY_EXT: 2915 case ATA_CMD_WRITE: 2916 case ATA_CMD_WRITE_EXT: 2917 case ATA_CMD_WRITE_FUA_EXT: 2918 case ATA_CMD_WRITE_QUEUED: 2919 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2920 case ATA_CMD_FPDMA_WRITE: 2921 case ATA_CMD_WRITE_MULTI: 2922 case ATA_CMD_WRITE_MULTI_EXT: 2923 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2924 case ATA_CMD_PIO_WRITE: 2925 case ATA_CMD_PIO_WRITE_EXT: 2926 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2927 case ATA_CMD_WRITE_STREAM_EXT: 2928 qc->sect_size = scmd->device->sector_size; 2929 break; 2930 2931 /* Everything else uses 512 byte "sectors" */ 2932 default: 2933 qc->sect_size = ATA_SECT_SIZE; 2934 } 2935 2936 /* 2937 * Set flags so that all registers will be written, pass on 2938 * write indication (used for PIO/DMA setup), result TF is 2939 * copied back and we don't whine too much about its failure. 2940 */ 2941 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2942 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2943 tf->flags |= ATA_TFLAG_WRITE; 2944 2945 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2946 2947 /* 2948 * Set transfer length. 2949 * 2950 * TODO: find out if we need to do more here to 2951 * cover scatter/gather case. 2952 */ 2953 ata_qc_set_pc_nbytes(qc); 2954 2955 /* We may not issue DMA commands if no DMA mode is set */ 2956 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2957 goto invalid_fld; 2958 2959 /* sanity check for pio multi commands */ 2960 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2961 goto invalid_fld; 2962 2963 if (is_multi_taskfile(tf)) { 2964 unsigned int multi_count = 1 << (cdb[1] >> 5); 2965 2966 /* compare the passed through multi_count 2967 * with the cached multi_count of libata 2968 */ 2969 if (multi_count != dev->multi_count) 2970 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 2971 multi_count); 2972 } 2973 2974 /* 2975 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2976 * SET_FEATURES - XFER MODE must be preceded/succeeded 2977 * by an update to hardware-specific registers for each 2978 * controller (i.e. the reason for ->set_piomode(), 2979 * ->set_dmamode(), and ->post_set_mode() hooks). 2980 */ 2981 if (tf->command == ATA_CMD_SET_FEATURES && 2982 tf->feature == SETFEATURES_XFER) 2983 goto invalid_fld; 2984 2985 /* 2986 * Filter TPM commands by default. These provide an 2987 * essentially uncontrolled encrypted "back door" between 2988 * applications and the disk. Set libata.allow_tpm=1 if you 2989 * have a real reason for wanting to use them. This ensures 2990 * that installed software cannot easily mess stuff up without 2991 * user intent. DVR type users will probably ship with this enabled 2992 * for movie content management. 2993 * 2994 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 2995 * for this and should do in future but that it is not sufficient as 2996 * DCS is an optional feature set. Thus we also do the software filter 2997 * so that we comply with the TC consortium stated goal that the user 2998 * can turn off TC features of their system. 2999 */ 3000 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3001 goto invalid_fld; 3002 3003 return 0; 3004 3005 invalid_fld: 3006 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3007 /* "Invalid field in cdb" */ 3008 return 1; 3009 } 3010 3011 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3012 { 3013 struct ata_taskfile *tf = &qc->tf; 3014 struct scsi_cmnd *scmd = qc->scsicmd; 3015 struct ata_device *dev = qc->dev; 3016 const u8 *cdb = scmd->cmnd; 3017 u64 block; 3018 u32 n_block; 3019 u32 size; 3020 void *buf; 3021 3022 /* we may not issue DMA commands if no DMA mode is set */ 3023 if (unlikely(!dev->dma_mode)) 3024 goto invalid_fld; 3025 3026 if (unlikely(scmd->cmd_len < 16)) 3027 goto invalid_fld; 3028 scsi_16_lba_len(cdb, &block, &n_block); 3029 3030 /* for now we only support WRITE SAME with the unmap bit set */ 3031 if (unlikely(!(cdb[1] & 0x8))) 3032 goto invalid_fld; 3033 3034 /* 3035 * WRITE SAME always has a sector sized buffer as payload, this 3036 * should never be a multiple entry S/G list. 3037 */ 3038 if (!scsi_sg_count(scmd)) 3039 goto invalid_fld; 3040 3041 buf = page_address(sg_page(scsi_sglist(scmd))); 3042 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3043 3044 tf->protocol = ATA_PROT_DMA; 3045 tf->hob_feature = 0; 3046 tf->feature = ATA_DSM_TRIM; 3047 tf->hob_nsect = (size / 512) >> 8; 3048 tf->nsect = size / 512; 3049 tf->command = ATA_CMD_DSM; 3050 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3051 ATA_TFLAG_WRITE; 3052 3053 ata_qc_set_pc_nbytes(qc); 3054 3055 return 0; 3056 3057 invalid_fld: 3058 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3059 /* "Invalid field in cdb" */ 3060 return 1; 3061 } 3062 3063 /** 3064 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3065 * @dev: ATA device 3066 * @cmd: SCSI command opcode to consider 3067 * 3068 * Look up the SCSI command given, and determine whether the 3069 * SCSI command is to be translated or simulated. 3070 * 3071 * RETURNS: 3072 * Pointer to translation function if possible, %NULL if not. 3073 */ 3074 3075 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3076 { 3077 switch (cmd) { 3078 case READ_6: 3079 case READ_10: 3080 case READ_16: 3081 3082 case WRITE_6: 3083 case WRITE_10: 3084 case WRITE_16: 3085 return ata_scsi_rw_xlat; 3086 3087 case WRITE_SAME_16: 3088 return ata_scsi_write_same_xlat; 3089 3090 case SYNCHRONIZE_CACHE: 3091 if (ata_try_flush_cache(dev)) 3092 return ata_scsi_flush_xlat; 3093 break; 3094 3095 case VERIFY: 3096 case VERIFY_16: 3097 return ata_scsi_verify_xlat; 3098 3099 case ATA_12: 3100 case ATA_16: 3101 return ata_scsi_pass_thru; 3102 3103 case START_STOP: 3104 return ata_scsi_start_stop_xlat; 3105 } 3106 3107 return NULL; 3108 } 3109 3110 /** 3111 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3112 * @ap: ATA port to which the command was being sent 3113 * @cmd: SCSI command to dump 3114 * 3115 * Prints the contents of a SCSI command via printk(). 3116 */ 3117 3118 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3119 struct scsi_cmnd *cmd) 3120 { 3121 #ifdef ATA_DEBUG 3122 struct scsi_device *scsidev = cmd->device; 3123 u8 *scsicmd = cmd->cmnd; 3124 3125 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3126 ap->print_id, 3127 scsidev->channel, scsidev->id, scsidev->lun, 3128 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3129 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3130 scsicmd[8]); 3131 #endif 3132 } 3133 3134 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3135 struct ata_device *dev) 3136 { 3137 u8 scsi_op = scmd->cmnd[0]; 3138 ata_xlat_func_t xlat_func; 3139 int rc = 0; 3140 3141 if (dev->class == ATA_DEV_ATA) { 3142 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3143 goto bad_cdb_len; 3144 3145 xlat_func = ata_get_xlat_func(dev, scsi_op); 3146 } else { 3147 if (unlikely(!scmd->cmd_len)) 3148 goto bad_cdb_len; 3149 3150 xlat_func = NULL; 3151 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3152 /* relay SCSI command to ATAPI device */ 3153 int len = COMMAND_SIZE(scsi_op); 3154 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3155 goto bad_cdb_len; 3156 3157 xlat_func = atapi_xlat; 3158 } else { 3159 /* ATA_16 passthru, treat as an ATA command */ 3160 if (unlikely(scmd->cmd_len > 16)) 3161 goto bad_cdb_len; 3162 3163 xlat_func = ata_get_xlat_func(dev, scsi_op); 3164 } 3165 } 3166 3167 if (xlat_func) 3168 rc = ata_scsi_translate(dev, scmd, xlat_func); 3169 else 3170 ata_scsi_simulate(dev, scmd); 3171 3172 return rc; 3173 3174 bad_cdb_len: 3175 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3176 scmd->cmd_len, scsi_op, dev->cdb_len); 3177 scmd->result = DID_ERROR << 16; 3178 scmd->scsi_done(scmd); 3179 return 0; 3180 } 3181 3182 /** 3183 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3184 * @shost: SCSI host of command to be sent 3185 * @cmd: SCSI command to be sent 3186 * 3187 * In some cases, this function translates SCSI commands into 3188 * ATA taskfiles, and queues the taskfiles to be sent to 3189 * hardware. In other cases, this function simulates a 3190 * SCSI device by evaluating and responding to certain 3191 * SCSI commands. This creates the overall effect of 3192 * ATA and ATAPI devices appearing as SCSI devices. 3193 * 3194 * LOCKING: 3195 * ATA host lock 3196 * 3197 * RETURNS: 3198 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3199 * 0 otherwise. 3200 */ 3201 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3202 { 3203 struct ata_port *ap; 3204 struct ata_device *dev; 3205 struct scsi_device *scsidev = cmd->device; 3206 int rc = 0; 3207 unsigned long irq_flags; 3208 3209 ap = ata_shost_to_port(shost); 3210 3211 spin_lock_irqsave(ap->lock, irq_flags); 3212 3213 ata_scsi_dump_cdb(ap, cmd); 3214 3215 dev = ata_scsi_find_dev(ap, scsidev); 3216 if (likely(dev)) 3217 rc = __ata_scsi_queuecmd(cmd, dev); 3218 else { 3219 cmd->result = (DID_BAD_TARGET << 16); 3220 cmd->scsi_done(cmd); 3221 } 3222 3223 spin_unlock_irqrestore(ap->lock, irq_flags); 3224 3225 return rc; 3226 } 3227 3228 /** 3229 * ata_scsi_simulate - simulate SCSI command on ATA device 3230 * @dev: the target device 3231 * @cmd: SCSI command being sent to device. 3232 * 3233 * Interprets and directly executes a select list of SCSI commands 3234 * that can be handled internally. 3235 * 3236 * LOCKING: 3237 * spin_lock_irqsave(host lock) 3238 */ 3239 3240 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3241 { 3242 struct ata_scsi_args args; 3243 const u8 *scsicmd = cmd->cmnd; 3244 u8 tmp8; 3245 3246 args.dev = dev; 3247 args.id = dev->id; 3248 args.cmd = cmd; 3249 args.done = cmd->scsi_done; 3250 3251 switch(scsicmd[0]) { 3252 /* TODO: worth improving? */ 3253 case FORMAT_UNIT: 3254 ata_scsi_invalid_field(cmd); 3255 break; 3256 3257 case INQUIRY: 3258 if (scsicmd[1] & 2) /* is CmdDt set? */ 3259 ata_scsi_invalid_field(cmd); 3260 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3261 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3262 else switch (scsicmd[2]) { 3263 case 0x00: 3264 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3265 break; 3266 case 0x80: 3267 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3268 break; 3269 case 0x83: 3270 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3271 break; 3272 case 0x89: 3273 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3274 break; 3275 case 0xb0: 3276 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3277 break; 3278 case 0xb1: 3279 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3280 break; 3281 case 0xb2: 3282 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3283 break; 3284 default: 3285 ata_scsi_invalid_field(cmd); 3286 break; 3287 } 3288 break; 3289 3290 case MODE_SENSE: 3291 case MODE_SENSE_10: 3292 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3293 break; 3294 3295 case MODE_SELECT: /* unconditionally return */ 3296 case MODE_SELECT_10: /* bad-field-in-cdb */ 3297 ata_scsi_invalid_field(cmd); 3298 break; 3299 3300 case READ_CAPACITY: 3301 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3302 break; 3303 3304 case SERVICE_ACTION_IN: 3305 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3306 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3307 else 3308 ata_scsi_invalid_field(cmd); 3309 break; 3310 3311 case REPORT_LUNS: 3312 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3313 break; 3314 3315 case REQUEST_SENSE: 3316 ata_scsi_set_sense(cmd, 0, 0, 0); 3317 cmd->result = (DRIVER_SENSE << 24); 3318 cmd->scsi_done(cmd); 3319 break; 3320 3321 /* if we reach this, then writeback caching is disabled, 3322 * turning this into a no-op. 3323 */ 3324 case SYNCHRONIZE_CACHE: 3325 /* fall through */ 3326 3327 /* no-op's, complete with success */ 3328 case REZERO_UNIT: 3329 case SEEK_6: 3330 case SEEK_10: 3331 case TEST_UNIT_READY: 3332 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3333 break; 3334 3335 case SEND_DIAGNOSTIC: 3336 tmp8 = scsicmd[1] & ~(1 << 3); 3337 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3338 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3339 else 3340 ata_scsi_invalid_field(cmd); 3341 break; 3342 3343 /* all other commands */ 3344 default: 3345 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3346 /* "Invalid command operation code" */ 3347 cmd->scsi_done(cmd); 3348 break; 3349 } 3350 } 3351 3352 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3353 { 3354 int i, rc; 3355 3356 for (i = 0; i < host->n_ports; i++) { 3357 struct ata_port *ap = host->ports[i]; 3358 struct Scsi_Host *shost; 3359 3360 rc = -ENOMEM; 3361 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3362 if (!shost) 3363 goto err_alloc; 3364 3365 *(struct ata_port **)&shost->hostdata[0] = ap; 3366 ap->scsi_host = shost; 3367 3368 shost->transportt = ata_scsi_transport_template; 3369 shost->unique_id = ap->print_id; 3370 shost->max_id = 16; 3371 shost->max_lun = 1; 3372 shost->max_channel = 1; 3373 shost->max_cmd_len = 16; 3374 3375 /* Schedule policy is determined by ->qc_defer() 3376 * callback and it needs to see every deferred qc. 3377 * Set host_blocked to 1 to prevent SCSI midlayer from 3378 * automatically deferring requests. 3379 */ 3380 shost->max_host_blocked = 1; 3381 3382 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 3383 if (rc) 3384 goto err_add; 3385 } 3386 3387 return 0; 3388 3389 err_add: 3390 scsi_host_put(host->ports[i]->scsi_host); 3391 err_alloc: 3392 while (--i >= 0) { 3393 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3394 3395 scsi_remove_host(shost); 3396 scsi_host_put(shost); 3397 } 3398 return rc; 3399 } 3400 3401 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3402 { 3403 int tries = 5; 3404 struct ata_device *last_failed_dev = NULL; 3405 struct ata_link *link; 3406 struct ata_device *dev; 3407 3408 repeat: 3409 ata_for_each_link(link, ap, EDGE) { 3410 ata_for_each_dev(dev, link, ENABLED) { 3411 struct scsi_device *sdev; 3412 int channel = 0, id = 0; 3413 3414 if (dev->sdev) 3415 continue; 3416 3417 if (ata_is_host_link(link)) 3418 id = dev->devno; 3419 else 3420 channel = link->pmp; 3421 3422 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3423 NULL); 3424 if (!IS_ERR(sdev)) { 3425 dev->sdev = sdev; 3426 scsi_device_put(sdev); 3427 } else { 3428 dev->sdev = NULL; 3429 } 3430 } 3431 } 3432 3433 /* If we scanned while EH was in progress or allocation 3434 * failure occurred, scan would have failed silently. Check 3435 * whether all devices are attached. 3436 */ 3437 ata_for_each_link(link, ap, EDGE) { 3438 ata_for_each_dev(dev, link, ENABLED) { 3439 if (!dev->sdev) 3440 goto exit_loop; 3441 } 3442 } 3443 exit_loop: 3444 if (!link) 3445 return; 3446 3447 /* we're missing some SCSI devices */ 3448 if (sync) { 3449 /* If caller requested synchrnous scan && we've made 3450 * any progress, sleep briefly and repeat. 3451 */ 3452 if (dev != last_failed_dev) { 3453 msleep(100); 3454 last_failed_dev = dev; 3455 goto repeat; 3456 } 3457 3458 /* We might be failing to detect boot device, give it 3459 * a few more chances. 3460 */ 3461 if (--tries) { 3462 msleep(100); 3463 goto repeat; 3464 } 3465 3466 ata_port_err(ap, 3467 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3468 } 3469 3470 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3471 round_jiffies_relative(HZ)); 3472 } 3473 3474 /** 3475 * ata_scsi_offline_dev - offline attached SCSI device 3476 * @dev: ATA device to offline attached SCSI device for 3477 * 3478 * This function is called from ata_eh_hotplug() and responsible 3479 * for taking the SCSI device attached to @dev offline. This 3480 * function is called with host lock which protects dev->sdev 3481 * against clearing. 3482 * 3483 * LOCKING: 3484 * spin_lock_irqsave(host lock) 3485 * 3486 * RETURNS: 3487 * 1 if attached SCSI device exists, 0 otherwise. 3488 */ 3489 int ata_scsi_offline_dev(struct ata_device *dev) 3490 { 3491 if (dev->sdev) { 3492 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3493 return 1; 3494 } 3495 return 0; 3496 } 3497 3498 /** 3499 * ata_scsi_remove_dev - remove attached SCSI device 3500 * @dev: ATA device to remove attached SCSI device for 3501 * 3502 * This function is called from ata_eh_scsi_hotplug() and 3503 * responsible for removing the SCSI device attached to @dev. 3504 * 3505 * LOCKING: 3506 * Kernel thread context (may sleep). 3507 */ 3508 static void ata_scsi_remove_dev(struct ata_device *dev) 3509 { 3510 struct ata_port *ap = dev->link->ap; 3511 struct scsi_device *sdev; 3512 unsigned long flags; 3513 3514 /* Alas, we need to grab scan_mutex to ensure SCSI device 3515 * state doesn't change underneath us and thus 3516 * scsi_device_get() always succeeds. The mutex locking can 3517 * be removed if there is __scsi_device_get() interface which 3518 * increments reference counts regardless of device state. 3519 */ 3520 mutex_lock(&ap->scsi_host->scan_mutex); 3521 spin_lock_irqsave(ap->lock, flags); 3522 3523 /* clearing dev->sdev is protected by host lock */ 3524 sdev = dev->sdev; 3525 dev->sdev = NULL; 3526 3527 if (sdev) { 3528 /* If user initiated unplug races with us, sdev can go 3529 * away underneath us after the host lock and 3530 * scan_mutex are released. Hold onto it. 3531 */ 3532 if (scsi_device_get(sdev) == 0) { 3533 /* The following ensures the attached sdev is 3534 * offline on return from ata_scsi_offline_dev() 3535 * regardless it wins or loses the race 3536 * against this function. 3537 */ 3538 scsi_device_set_state(sdev, SDEV_OFFLINE); 3539 } else { 3540 WARN_ON(1); 3541 sdev = NULL; 3542 } 3543 } 3544 3545 spin_unlock_irqrestore(ap->lock, flags); 3546 mutex_unlock(&ap->scsi_host->scan_mutex); 3547 3548 if (sdev) { 3549 ata_dev_info(dev, "detaching (SCSI %s)\n", 3550 dev_name(&sdev->sdev_gendev)); 3551 3552 scsi_remove_device(sdev); 3553 scsi_device_put(sdev); 3554 } 3555 } 3556 3557 static void ata_scsi_handle_link_detach(struct ata_link *link) 3558 { 3559 struct ata_port *ap = link->ap; 3560 struct ata_device *dev; 3561 3562 ata_for_each_dev(dev, link, ALL) { 3563 unsigned long flags; 3564 3565 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3566 continue; 3567 3568 spin_lock_irqsave(ap->lock, flags); 3569 dev->flags &= ~ATA_DFLAG_DETACHED; 3570 spin_unlock_irqrestore(ap->lock, flags); 3571 3572 ata_scsi_remove_dev(dev); 3573 } 3574 } 3575 3576 /** 3577 * ata_scsi_media_change_notify - send media change event 3578 * @dev: Pointer to the disk device with media change event 3579 * 3580 * Tell the block layer to send a media change notification 3581 * event. 3582 * 3583 * LOCKING: 3584 * spin_lock_irqsave(host lock) 3585 */ 3586 void ata_scsi_media_change_notify(struct ata_device *dev) 3587 { 3588 if (dev->sdev) 3589 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3590 GFP_ATOMIC); 3591 } 3592 3593 /** 3594 * ata_scsi_hotplug - SCSI part of hotplug 3595 * @work: Pointer to ATA port to perform SCSI hotplug on 3596 * 3597 * Perform SCSI part of hotplug. It's executed from a separate 3598 * workqueue after EH completes. This is necessary because SCSI 3599 * hot plugging requires working EH and hot unplugging is 3600 * synchronized with hot plugging with a mutex. 3601 * 3602 * LOCKING: 3603 * Kernel thread context (may sleep). 3604 */ 3605 void ata_scsi_hotplug(struct work_struct *work) 3606 { 3607 struct ata_port *ap = 3608 container_of(work, struct ata_port, hotplug_task.work); 3609 int i; 3610 3611 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3612 DPRINTK("ENTER/EXIT - unloading\n"); 3613 return; 3614 } 3615 3616 DPRINTK("ENTER\n"); 3617 mutex_lock(&ap->scsi_scan_mutex); 3618 3619 /* Unplug detached devices. We cannot use link iterator here 3620 * because PMP links have to be scanned even if PMP is 3621 * currently not attached. Iterate manually. 3622 */ 3623 ata_scsi_handle_link_detach(&ap->link); 3624 if (ap->pmp_link) 3625 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3626 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3627 3628 /* scan for new ones */ 3629 ata_scsi_scan_host(ap, 0); 3630 3631 mutex_unlock(&ap->scsi_scan_mutex); 3632 DPRINTK("EXIT\n"); 3633 } 3634 3635 /** 3636 * ata_scsi_user_scan - indication for user-initiated bus scan 3637 * @shost: SCSI host to scan 3638 * @channel: Channel to scan 3639 * @id: ID to scan 3640 * @lun: LUN to scan 3641 * 3642 * This function is called when user explicitly requests bus 3643 * scan. Set probe pending flag and invoke EH. 3644 * 3645 * LOCKING: 3646 * SCSI layer (we don't care) 3647 * 3648 * RETURNS: 3649 * Zero. 3650 */ 3651 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3652 unsigned int id, unsigned int lun) 3653 { 3654 struct ata_port *ap = ata_shost_to_port(shost); 3655 unsigned long flags; 3656 int devno, rc = 0; 3657 3658 if (!ap->ops->error_handler) 3659 return -EOPNOTSUPP; 3660 3661 if (lun != SCAN_WILD_CARD && lun) 3662 return -EINVAL; 3663 3664 if (!sata_pmp_attached(ap)) { 3665 if (channel != SCAN_WILD_CARD && channel) 3666 return -EINVAL; 3667 devno = id; 3668 } else { 3669 if (id != SCAN_WILD_CARD && id) 3670 return -EINVAL; 3671 devno = channel; 3672 } 3673 3674 spin_lock_irqsave(ap->lock, flags); 3675 3676 if (devno == SCAN_WILD_CARD) { 3677 struct ata_link *link; 3678 3679 ata_for_each_link(link, ap, EDGE) { 3680 struct ata_eh_info *ehi = &link->eh_info; 3681 ehi->probe_mask |= ATA_ALL_DEVICES; 3682 ehi->action |= ATA_EH_RESET; 3683 } 3684 } else { 3685 struct ata_device *dev = ata_find_dev(ap, devno); 3686 3687 if (dev) { 3688 struct ata_eh_info *ehi = &dev->link->eh_info; 3689 ehi->probe_mask |= 1 << dev->devno; 3690 ehi->action |= ATA_EH_RESET; 3691 } else 3692 rc = -EINVAL; 3693 } 3694 3695 if (rc == 0) { 3696 ata_port_schedule_eh(ap); 3697 spin_unlock_irqrestore(ap->lock, flags); 3698 ata_port_wait_eh(ap); 3699 } else 3700 spin_unlock_irqrestore(ap->lock, flags); 3701 3702 return rc; 3703 } 3704 3705 /** 3706 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3707 * @work: Pointer to ATA port to perform scsi_rescan_device() 3708 * 3709 * After ATA pass thru (SAT) commands are executed successfully, 3710 * libata need to propagate the changes to SCSI layer. 3711 * 3712 * LOCKING: 3713 * Kernel thread context (may sleep). 3714 */ 3715 void ata_scsi_dev_rescan(struct work_struct *work) 3716 { 3717 struct ata_port *ap = 3718 container_of(work, struct ata_port, scsi_rescan_task); 3719 struct ata_link *link; 3720 struct ata_device *dev; 3721 unsigned long flags; 3722 3723 mutex_lock(&ap->scsi_scan_mutex); 3724 spin_lock_irqsave(ap->lock, flags); 3725 3726 ata_for_each_link(link, ap, EDGE) { 3727 ata_for_each_dev(dev, link, ENABLED) { 3728 struct scsi_device *sdev = dev->sdev; 3729 3730 if (!sdev) 3731 continue; 3732 if (scsi_device_get(sdev)) 3733 continue; 3734 3735 spin_unlock_irqrestore(ap->lock, flags); 3736 scsi_rescan_device(&(sdev->sdev_gendev)); 3737 scsi_device_put(sdev); 3738 spin_lock_irqsave(ap->lock, flags); 3739 } 3740 } 3741 3742 spin_unlock_irqrestore(ap->lock, flags); 3743 mutex_unlock(&ap->scsi_scan_mutex); 3744 } 3745 3746 /** 3747 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3748 * @host: ATA host container for all SAS ports 3749 * @port_info: Information from low-level host driver 3750 * @shost: SCSI host that the scsi device is attached to 3751 * 3752 * LOCKING: 3753 * PCI/etc. bus probe sem. 3754 * 3755 * RETURNS: 3756 * ata_port pointer on success / NULL on failure. 3757 */ 3758 3759 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3760 struct ata_port_info *port_info, 3761 struct Scsi_Host *shost) 3762 { 3763 struct ata_port *ap; 3764 3765 ap = ata_port_alloc(host); 3766 if (!ap) 3767 return NULL; 3768 3769 ap->port_no = 0; 3770 ap->lock = &host->lock; 3771 ap->pio_mask = port_info->pio_mask; 3772 ap->mwdma_mask = port_info->mwdma_mask; 3773 ap->udma_mask = port_info->udma_mask; 3774 ap->flags |= port_info->flags; 3775 ap->ops = port_info->port_ops; 3776 ap->cbl = ATA_CBL_SATA; 3777 3778 return ap; 3779 } 3780 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3781 3782 /** 3783 * ata_sas_port_start - Set port up for dma. 3784 * @ap: Port to initialize 3785 * 3786 * Called just after data structures for each port are 3787 * initialized. 3788 * 3789 * May be used as the port_start() entry in ata_port_operations. 3790 * 3791 * LOCKING: 3792 * Inherited from caller. 3793 */ 3794 int ata_sas_port_start(struct ata_port *ap) 3795 { 3796 /* 3797 * the port is marked as frozen at allocation time, but if we don't 3798 * have new eh, we won't thaw it 3799 */ 3800 if (!ap->ops->error_handler) 3801 ap->pflags &= ~ATA_PFLAG_FROZEN; 3802 return 0; 3803 } 3804 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3805 3806 /** 3807 * ata_port_stop - Undo ata_sas_port_start() 3808 * @ap: Port to shut down 3809 * 3810 * May be used as the port_stop() entry in ata_port_operations. 3811 * 3812 * LOCKING: 3813 * Inherited from caller. 3814 */ 3815 3816 void ata_sas_port_stop(struct ata_port *ap) 3817 { 3818 } 3819 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3820 3821 /** 3822 * ata_sas_port_init - Initialize a SATA device 3823 * @ap: SATA port to initialize 3824 * 3825 * LOCKING: 3826 * PCI/etc. bus probe sem. 3827 * 3828 * RETURNS: 3829 * Zero on success, non-zero on error. 3830 */ 3831 3832 int ata_sas_port_init(struct ata_port *ap) 3833 { 3834 int rc = ap->ops->port_start(ap); 3835 3836 if (!rc) { 3837 ap->print_id = ata_print_id++; 3838 rc = ata_port_probe(ap); 3839 } 3840 3841 return rc; 3842 } 3843 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3844 3845 /** 3846 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3847 * @ap: SATA port to destroy 3848 * 3849 */ 3850 3851 void ata_sas_port_destroy(struct ata_port *ap) 3852 { 3853 if (ap->ops->port_stop) 3854 ap->ops->port_stop(ap); 3855 kfree(ap); 3856 } 3857 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3858 3859 /** 3860 * ata_sas_slave_configure - Default slave_config routine for libata devices 3861 * @sdev: SCSI device to configure 3862 * @ap: ATA port to which SCSI device is attached 3863 * 3864 * RETURNS: 3865 * Zero. 3866 */ 3867 3868 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3869 { 3870 ata_scsi_sdev_config(sdev); 3871 ata_scsi_dev_config(sdev, ap->link.device); 3872 return 0; 3873 } 3874 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3875 3876 /** 3877 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3878 * @cmd: SCSI command to be sent 3879 * @ap: ATA port to which the command is being sent 3880 * 3881 * RETURNS: 3882 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3883 * 0 otherwise. 3884 */ 3885 3886 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 3887 { 3888 int rc = 0; 3889 3890 ata_scsi_dump_cdb(ap, cmd); 3891 3892 if (likely(ata_dev_enabled(ap->link.device))) 3893 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 3894 else { 3895 cmd->result = (DID_BAD_TARGET << 16); 3896 cmd->scsi_done(cmd); 3897 } 3898 return rc; 3899 } 3900 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3901