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