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 * @ap: ATA port to which the device change the queue depth 1221 * @sdev: SCSI device to configure queue depth for 1222 * @queue_depth: new queue depth 1223 * @reason: calling context 1224 * 1225 * libsas and libata have different approaches for associating a sdev to 1226 * its ata_port. 1227 * 1228 */ 1229 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1230 int queue_depth, int reason) 1231 { 1232 struct ata_device *dev; 1233 unsigned long flags; 1234 1235 if (reason != SCSI_QDEPTH_DEFAULT) 1236 return -EOPNOTSUPP; 1237 1238 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1239 return sdev->queue_depth; 1240 1241 dev = ata_scsi_find_dev(ap, sdev); 1242 if (!dev || !ata_dev_enabled(dev)) 1243 return sdev->queue_depth; 1244 1245 /* NCQ enabled? */ 1246 spin_lock_irqsave(ap->lock, flags); 1247 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1248 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1249 dev->flags |= ATA_DFLAG_NCQ_OFF; 1250 queue_depth = 1; 1251 } 1252 spin_unlock_irqrestore(ap->lock, flags); 1253 1254 /* limit and apply queue depth */ 1255 queue_depth = min(queue_depth, sdev->host->can_queue); 1256 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1257 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1258 1259 if (sdev->queue_depth == queue_depth) 1260 return -EINVAL; 1261 1262 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1263 return queue_depth; 1264 } 1265 1266 /** 1267 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1268 * @sdev: SCSI device to configure queue depth for 1269 * @queue_depth: new queue depth 1270 * @reason: calling context 1271 * 1272 * This is libata standard hostt->change_queue_depth callback. 1273 * SCSI will call into this callback when user tries to set queue 1274 * depth via sysfs. 1275 * 1276 * LOCKING: 1277 * SCSI layer (we don't care) 1278 * 1279 * RETURNS: 1280 * Newly configured queue depth. 1281 */ 1282 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1283 int reason) 1284 { 1285 struct ata_port *ap = ata_shost_to_port(sdev->host); 1286 1287 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1288 } 1289 1290 /** 1291 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1292 * @qc: Storage for translated ATA taskfile 1293 * 1294 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1295 * (to start). Perhaps these commands should be preceded by 1296 * CHECK POWER MODE to see what power mode the device is already in. 1297 * [See SAT revision 5 at www.t10.org] 1298 * 1299 * LOCKING: 1300 * spin_lock_irqsave(host lock) 1301 * 1302 * RETURNS: 1303 * Zero on success, non-zero on error. 1304 */ 1305 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1306 { 1307 struct scsi_cmnd *scmd = qc->scsicmd; 1308 struct ata_taskfile *tf = &qc->tf; 1309 const u8 *cdb = scmd->cmnd; 1310 1311 if (scmd->cmd_len < 5) 1312 goto invalid_fld; 1313 1314 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1315 tf->protocol = ATA_PROT_NODATA; 1316 if (cdb[1] & 0x1) { 1317 ; /* ignore IMMED bit, violates sat-r05 */ 1318 } 1319 if (cdb[4] & 0x2) 1320 goto invalid_fld; /* LOEJ bit set not supported */ 1321 if (((cdb[4] >> 4) & 0xf) != 0) 1322 goto invalid_fld; /* power conditions not supported */ 1323 1324 if (cdb[4] & 0x1) { 1325 tf->nsect = 1; /* 1 sector, lba=0 */ 1326 1327 if (qc->dev->flags & ATA_DFLAG_LBA) { 1328 tf->flags |= ATA_TFLAG_LBA; 1329 1330 tf->lbah = 0x0; 1331 tf->lbam = 0x0; 1332 tf->lbal = 0x0; 1333 tf->device |= ATA_LBA; 1334 } else { 1335 /* CHS */ 1336 tf->lbal = 0x1; /* sect */ 1337 tf->lbam = 0x0; /* cyl low */ 1338 tf->lbah = 0x0; /* cyl high */ 1339 } 1340 1341 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1342 } else { 1343 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1344 * or S5) causing some drives to spin up and down again. 1345 */ 1346 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1347 system_state == SYSTEM_POWER_OFF) 1348 goto skip; 1349 1350 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1351 system_entering_hibernation()) 1352 goto skip; 1353 1354 /* Issue ATA STANDBY IMMEDIATE command */ 1355 tf->command = ATA_CMD_STANDBYNOW1; 1356 } 1357 1358 /* 1359 * Standby and Idle condition timers could be implemented but that 1360 * would require libata to implement the Power condition mode page 1361 * and allow the user to change it. Changing mode pages requires 1362 * MODE SELECT to be implemented. 1363 */ 1364 1365 return 0; 1366 1367 invalid_fld: 1368 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1369 /* "Invalid field in cbd" */ 1370 return 1; 1371 skip: 1372 scmd->result = SAM_STAT_GOOD; 1373 return 1; 1374 } 1375 1376 1377 /** 1378 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1379 * @qc: Storage for translated ATA taskfile 1380 * 1381 * Sets up an ATA taskfile to issue FLUSH CACHE or 1382 * FLUSH CACHE EXT. 1383 * 1384 * LOCKING: 1385 * spin_lock_irqsave(host lock) 1386 * 1387 * RETURNS: 1388 * Zero on success, non-zero on error. 1389 */ 1390 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1391 { 1392 struct ata_taskfile *tf = &qc->tf; 1393 1394 tf->flags |= ATA_TFLAG_DEVICE; 1395 tf->protocol = ATA_PROT_NODATA; 1396 1397 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1398 tf->command = ATA_CMD_FLUSH_EXT; 1399 else 1400 tf->command = ATA_CMD_FLUSH; 1401 1402 /* flush is critical for IO integrity, consider it an IO command */ 1403 qc->flags |= ATA_QCFLAG_IO; 1404 1405 return 0; 1406 } 1407 1408 /** 1409 * scsi_6_lba_len - Get LBA and transfer length 1410 * @cdb: SCSI command to translate 1411 * 1412 * Calculate LBA and transfer length for 6-byte commands. 1413 * 1414 * RETURNS: 1415 * @plba: the LBA 1416 * @plen: the transfer length 1417 */ 1418 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1419 { 1420 u64 lba = 0; 1421 u32 len; 1422 1423 VPRINTK("six-byte command\n"); 1424 1425 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1426 lba |= ((u64)cdb[2]) << 8; 1427 lba |= ((u64)cdb[3]); 1428 1429 len = cdb[4]; 1430 1431 *plba = lba; 1432 *plen = len; 1433 } 1434 1435 /** 1436 * scsi_10_lba_len - Get LBA and transfer length 1437 * @cdb: SCSI command to translate 1438 * 1439 * Calculate LBA and transfer length for 10-byte commands. 1440 * 1441 * RETURNS: 1442 * @plba: the LBA 1443 * @plen: the transfer length 1444 */ 1445 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1446 { 1447 u64 lba = 0; 1448 u32 len = 0; 1449 1450 VPRINTK("ten-byte command\n"); 1451 1452 lba |= ((u64)cdb[2]) << 24; 1453 lba |= ((u64)cdb[3]) << 16; 1454 lba |= ((u64)cdb[4]) << 8; 1455 lba |= ((u64)cdb[5]); 1456 1457 len |= ((u32)cdb[7]) << 8; 1458 len |= ((u32)cdb[8]); 1459 1460 *plba = lba; 1461 *plen = len; 1462 } 1463 1464 /** 1465 * scsi_16_lba_len - Get LBA and transfer length 1466 * @cdb: SCSI command to translate 1467 * 1468 * Calculate LBA and transfer length for 16-byte commands. 1469 * 1470 * RETURNS: 1471 * @plba: the LBA 1472 * @plen: the transfer length 1473 */ 1474 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1475 { 1476 u64 lba = 0; 1477 u32 len = 0; 1478 1479 VPRINTK("sixteen-byte command\n"); 1480 1481 lba |= ((u64)cdb[2]) << 56; 1482 lba |= ((u64)cdb[3]) << 48; 1483 lba |= ((u64)cdb[4]) << 40; 1484 lba |= ((u64)cdb[5]) << 32; 1485 lba |= ((u64)cdb[6]) << 24; 1486 lba |= ((u64)cdb[7]) << 16; 1487 lba |= ((u64)cdb[8]) << 8; 1488 lba |= ((u64)cdb[9]); 1489 1490 len |= ((u32)cdb[10]) << 24; 1491 len |= ((u32)cdb[11]) << 16; 1492 len |= ((u32)cdb[12]) << 8; 1493 len |= ((u32)cdb[13]); 1494 1495 *plba = lba; 1496 *plen = len; 1497 } 1498 1499 /** 1500 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1501 * @qc: Storage for translated ATA taskfile 1502 * 1503 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1504 * 1505 * LOCKING: 1506 * spin_lock_irqsave(host lock) 1507 * 1508 * RETURNS: 1509 * Zero on success, non-zero on error. 1510 */ 1511 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1512 { 1513 struct scsi_cmnd *scmd = qc->scsicmd; 1514 struct ata_taskfile *tf = &qc->tf; 1515 struct ata_device *dev = qc->dev; 1516 u64 dev_sectors = qc->dev->n_sectors; 1517 const u8 *cdb = scmd->cmnd; 1518 u64 block; 1519 u32 n_block; 1520 1521 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1522 tf->protocol = ATA_PROT_NODATA; 1523 1524 if (cdb[0] == VERIFY) { 1525 if (scmd->cmd_len < 10) 1526 goto invalid_fld; 1527 scsi_10_lba_len(cdb, &block, &n_block); 1528 } else if (cdb[0] == VERIFY_16) { 1529 if (scmd->cmd_len < 16) 1530 goto invalid_fld; 1531 scsi_16_lba_len(cdb, &block, &n_block); 1532 } else 1533 goto invalid_fld; 1534 1535 if (!n_block) 1536 goto nothing_to_do; 1537 if (block >= dev_sectors) 1538 goto out_of_range; 1539 if ((block + n_block) > dev_sectors) 1540 goto out_of_range; 1541 1542 if (dev->flags & ATA_DFLAG_LBA) { 1543 tf->flags |= ATA_TFLAG_LBA; 1544 1545 if (lba_28_ok(block, n_block)) { 1546 /* use LBA28 */ 1547 tf->command = ATA_CMD_VERIFY; 1548 tf->device |= (block >> 24) & 0xf; 1549 } else if (lba_48_ok(block, n_block)) { 1550 if (!(dev->flags & ATA_DFLAG_LBA48)) 1551 goto out_of_range; 1552 1553 /* use LBA48 */ 1554 tf->flags |= ATA_TFLAG_LBA48; 1555 tf->command = ATA_CMD_VERIFY_EXT; 1556 1557 tf->hob_nsect = (n_block >> 8) & 0xff; 1558 1559 tf->hob_lbah = (block >> 40) & 0xff; 1560 tf->hob_lbam = (block >> 32) & 0xff; 1561 tf->hob_lbal = (block >> 24) & 0xff; 1562 } else 1563 /* request too large even for LBA48 */ 1564 goto out_of_range; 1565 1566 tf->nsect = n_block & 0xff; 1567 1568 tf->lbah = (block >> 16) & 0xff; 1569 tf->lbam = (block >> 8) & 0xff; 1570 tf->lbal = block & 0xff; 1571 1572 tf->device |= ATA_LBA; 1573 } else { 1574 /* CHS */ 1575 u32 sect, head, cyl, track; 1576 1577 if (!lba_28_ok(block, n_block)) 1578 goto out_of_range; 1579 1580 /* Convert LBA to CHS */ 1581 track = (u32)block / dev->sectors; 1582 cyl = track / dev->heads; 1583 head = track % dev->heads; 1584 sect = (u32)block % dev->sectors + 1; 1585 1586 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1587 (u32)block, track, cyl, head, sect); 1588 1589 /* Check whether the converted CHS can fit. 1590 Cylinder: 0-65535 1591 Head: 0-15 1592 Sector: 1-255*/ 1593 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1594 goto out_of_range; 1595 1596 tf->command = ATA_CMD_VERIFY; 1597 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1598 tf->lbal = sect; 1599 tf->lbam = cyl; 1600 tf->lbah = cyl >> 8; 1601 tf->device |= head; 1602 } 1603 1604 return 0; 1605 1606 invalid_fld: 1607 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1608 /* "Invalid field in cbd" */ 1609 return 1; 1610 1611 out_of_range: 1612 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1613 /* "Logical Block Address out of range" */ 1614 return 1; 1615 1616 nothing_to_do: 1617 scmd->result = SAM_STAT_GOOD; 1618 return 1; 1619 } 1620 1621 /** 1622 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1623 * @qc: Storage for translated ATA taskfile 1624 * 1625 * Converts any of six SCSI read/write commands into the 1626 * ATA counterpart, including starting sector (LBA), 1627 * sector count, and taking into account the device's LBA48 1628 * support. 1629 * 1630 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1631 * %WRITE_16 are currently supported. 1632 * 1633 * LOCKING: 1634 * spin_lock_irqsave(host lock) 1635 * 1636 * RETURNS: 1637 * Zero on success, non-zero on error. 1638 */ 1639 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1640 { 1641 struct scsi_cmnd *scmd = qc->scsicmd; 1642 const u8 *cdb = scmd->cmnd; 1643 unsigned int tf_flags = 0; 1644 u64 block; 1645 u32 n_block; 1646 int rc; 1647 1648 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1649 tf_flags |= ATA_TFLAG_WRITE; 1650 1651 /* Calculate the SCSI LBA, transfer length and FUA. */ 1652 switch (cdb[0]) { 1653 case READ_10: 1654 case WRITE_10: 1655 if (unlikely(scmd->cmd_len < 10)) 1656 goto invalid_fld; 1657 scsi_10_lba_len(cdb, &block, &n_block); 1658 if (cdb[1] & (1 << 3)) 1659 tf_flags |= ATA_TFLAG_FUA; 1660 break; 1661 case READ_6: 1662 case WRITE_6: 1663 if (unlikely(scmd->cmd_len < 6)) 1664 goto invalid_fld; 1665 scsi_6_lba_len(cdb, &block, &n_block); 1666 1667 /* for 6-byte r/w commands, transfer length 0 1668 * means 256 blocks of data, not 0 block. 1669 */ 1670 if (!n_block) 1671 n_block = 256; 1672 break; 1673 case READ_16: 1674 case WRITE_16: 1675 if (unlikely(scmd->cmd_len < 16)) 1676 goto invalid_fld; 1677 scsi_16_lba_len(cdb, &block, &n_block); 1678 if (cdb[1] & (1 << 3)) 1679 tf_flags |= ATA_TFLAG_FUA; 1680 break; 1681 default: 1682 DPRINTK("no-byte command\n"); 1683 goto invalid_fld; 1684 } 1685 1686 /* Check and compose ATA command */ 1687 if (!n_block) 1688 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1689 * length 0 means transfer 0 block of data. 1690 * However, for ATA R/W commands, sector count 0 means 1691 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1692 * 1693 * WARNING: one or two older ATA drives treat 0 as 0... 1694 */ 1695 goto nothing_to_do; 1696 1697 qc->flags |= ATA_QCFLAG_IO; 1698 qc->nbytes = n_block * scmd->device->sector_size; 1699 1700 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1701 qc->tag); 1702 if (likely(rc == 0)) 1703 return 0; 1704 1705 if (rc == -ERANGE) 1706 goto out_of_range; 1707 /* treat all other errors as -EINVAL, fall through */ 1708 invalid_fld: 1709 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1710 /* "Invalid field in cbd" */ 1711 return 1; 1712 1713 out_of_range: 1714 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1715 /* "Logical Block Address out of range" */ 1716 return 1; 1717 1718 nothing_to_do: 1719 scmd->result = SAM_STAT_GOOD; 1720 return 1; 1721 } 1722 1723 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1724 { 1725 struct ata_port *ap = qc->ap; 1726 struct scsi_cmnd *cmd = qc->scsicmd; 1727 u8 *cdb = cmd->cmnd; 1728 int need_sense = (qc->err_mask != 0); 1729 1730 /* For ATA pass thru (SAT) commands, generate a sense block if 1731 * user mandated it or if there's an error. Note that if we 1732 * generate because the user forced us to, a check condition 1733 * is generated and the ATA register values are returned 1734 * whether the command completed successfully or not. If there 1735 * was no error, SK, ASC and ASCQ will all be zero. 1736 */ 1737 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1738 ((cdb[2] & 0x20) || need_sense)) { 1739 ata_gen_passthru_sense(qc); 1740 } else { 1741 if (!need_sense) { 1742 cmd->result = SAM_STAT_GOOD; 1743 } else { 1744 /* TODO: decide which descriptor format to use 1745 * for 48b LBA devices and call that here 1746 * instead of the fixed desc, which is only 1747 * good for smaller LBA (and maybe CHS?) 1748 * devices. 1749 */ 1750 ata_gen_ata_sense(qc); 1751 } 1752 } 1753 1754 if (need_sense && !ap->ops->error_handler) 1755 ata_dump_status(ap->print_id, &qc->result_tf); 1756 1757 qc->scsidone(cmd); 1758 1759 ata_qc_free(qc); 1760 } 1761 1762 /** 1763 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1764 * @dev: ATA device to which the command is addressed 1765 * @cmd: SCSI command to execute 1766 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1767 * 1768 * Our ->queuecommand() function has decided that the SCSI 1769 * command issued can be directly translated into an ATA 1770 * command, rather than handled internally. 1771 * 1772 * This function sets up an ata_queued_cmd structure for the 1773 * SCSI command, and sends that ata_queued_cmd to the hardware. 1774 * 1775 * The xlat_func argument (actor) returns 0 if ready to execute 1776 * ATA command, else 1 to finish translation. If 1 is returned 1777 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1778 * to be set reflecting an error condition or clean (early) 1779 * termination. 1780 * 1781 * LOCKING: 1782 * spin_lock_irqsave(host lock) 1783 * 1784 * RETURNS: 1785 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1786 * needs to be deferred. 1787 */ 1788 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1789 ata_xlat_func_t xlat_func) 1790 { 1791 struct ata_port *ap = dev->link->ap; 1792 struct ata_queued_cmd *qc; 1793 int rc; 1794 1795 VPRINTK("ENTER\n"); 1796 1797 qc = ata_scsi_qc_new(dev, cmd); 1798 if (!qc) 1799 goto err_mem; 1800 1801 /* data is present; dma-map it */ 1802 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1803 cmd->sc_data_direction == DMA_TO_DEVICE) { 1804 if (unlikely(scsi_bufflen(cmd) < 1)) { 1805 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1806 goto err_did; 1807 } 1808 1809 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1810 1811 qc->dma_dir = cmd->sc_data_direction; 1812 } 1813 1814 qc->complete_fn = ata_scsi_qc_complete; 1815 1816 if (xlat_func(qc)) 1817 goto early_finish; 1818 1819 if (ap->ops->qc_defer) { 1820 if ((rc = ap->ops->qc_defer(qc))) 1821 goto defer; 1822 } 1823 1824 /* select device, send command to hardware */ 1825 ata_qc_issue(qc); 1826 1827 VPRINTK("EXIT\n"); 1828 return 0; 1829 1830 early_finish: 1831 ata_qc_free(qc); 1832 cmd->scsi_done(cmd); 1833 DPRINTK("EXIT - early finish (good or error)\n"); 1834 return 0; 1835 1836 err_did: 1837 ata_qc_free(qc); 1838 cmd->result = (DID_ERROR << 16); 1839 cmd->scsi_done(cmd); 1840 err_mem: 1841 DPRINTK("EXIT - internal\n"); 1842 return 0; 1843 1844 defer: 1845 ata_qc_free(qc); 1846 DPRINTK("EXIT - defer\n"); 1847 if (rc == ATA_DEFER_LINK) 1848 return SCSI_MLQUEUE_DEVICE_BUSY; 1849 else 1850 return SCSI_MLQUEUE_HOST_BUSY; 1851 } 1852 1853 /** 1854 * ata_scsi_rbuf_get - Map response buffer. 1855 * @cmd: SCSI command containing buffer to be mapped. 1856 * @flags: unsigned long variable to store irq enable status 1857 * @copy_in: copy in from user buffer 1858 * 1859 * Prepare buffer for simulated SCSI commands. 1860 * 1861 * LOCKING: 1862 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1863 * 1864 * RETURNS: 1865 * Pointer to response buffer. 1866 */ 1867 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1868 unsigned long *flags) 1869 { 1870 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1871 1872 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1873 if (copy_in) 1874 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1875 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1876 return ata_scsi_rbuf; 1877 } 1878 1879 /** 1880 * ata_scsi_rbuf_put - Unmap response buffer. 1881 * @cmd: SCSI command containing buffer to be unmapped. 1882 * @copy_out: copy out result 1883 * @flags: @flags passed to ata_scsi_rbuf_get() 1884 * 1885 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1886 * @copy_back is true. 1887 * 1888 * LOCKING: 1889 * Unlocks ata_scsi_rbuf_lock. 1890 */ 1891 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1892 unsigned long *flags) 1893 { 1894 if (copy_out) 1895 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1896 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1897 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1898 } 1899 1900 /** 1901 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1902 * @args: device IDENTIFY data / SCSI command of interest. 1903 * @actor: Callback hook for desired SCSI command simulator 1904 * 1905 * Takes care of the hard work of simulating a SCSI command... 1906 * Mapping the response buffer, calling the command's handler, 1907 * and handling the handler's return value. This return value 1908 * indicates whether the handler wishes the SCSI command to be 1909 * completed successfully (0), or not (in which case cmd->result 1910 * and sense buffer are assumed to be set). 1911 * 1912 * LOCKING: 1913 * spin_lock_irqsave(host lock) 1914 */ 1915 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1916 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1917 { 1918 u8 *rbuf; 1919 unsigned int rc; 1920 struct scsi_cmnd *cmd = args->cmd; 1921 unsigned long flags; 1922 1923 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1924 rc = actor(args, rbuf); 1925 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1926 1927 if (rc == 0) 1928 cmd->result = SAM_STAT_GOOD; 1929 args->done(cmd); 1930 } 1931 1932 /** 1933 * ata_scsiop_inq_std - Simulate INQUIRY command 1934 * @args: device IDENTIFY data / SCSI command of interest. 1935 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1936 * 1937 * Returns standard device identification data associated 1938 * with non-VPD INQUIRY command output. 1939 * 1940 * LOCKING: 1941 * spin_lock_irqsave(host lock) 1942 */ 1943 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1944 { 1945 const u8 versions[] = { 1946 0x60, /* SAM-3 (no version claimed) */ 1947 1948 0x03, 1949 0x20, /* SBC-2 (no version claimed) */ 1950 1951 0x02, 1952 0x60 /* SPC-3 (no version claimed) */ 1953 }; 1954 u8 hdr[] = { 1955 TYPE_DISK, 1956 0, 1957 0x5, /* claim SPC-3 version compatibility */ 1958 2, 1959 95 - 4 1960 }; 1961 1962 VPRINTK("ENTER\n"); 1963 1964 /* set scsi removeable (RMB) bit per ata bit */ 1965 if (ata_id_removeable(args->id)) 1966 hdr[1] |= (1 << 7); 1967 1968 memcpy(rbuf, hdr, sizeof(hdr)); 1969 memcpy(&rbuf[8], "ATA ", 8); 1970 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1971 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1972 1973 if (rbuf[32] == 0 || rbuf[32] == ' ') 1974 memcpy(&rbuf[32], "n/a ", 4); 1975 1976 memcpy(rbuf + 59, versions, sizeof(versions)); 1977 1978 return 0; 1979 } 1980 1981 /** 1982 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1983 * @args: device IDENTIFY data / SCSI command of interest. 1984 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1985 * 1986 * Returns list of inquiry VPD pages available. 1987 * 1988 * LOCKING: 1989 * spin_lock_irqsave(host lock) 1990 */ 1991 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 1992 { 1993 const u8 pages[] = { 1994 0x00, /* page 0x00, this page */ 1995 0x80, /* page 0x80, unit serial no page */ 1996 0x83, /* page 0x83, device ident page */ 1997 0x89, /* page 0x89, ata info page */ 1998 0xb0, /* page 0xb0, block limits page */ 1999 0xb1, /* page 0xb1, block device characteristics page */ 2000 0xb2, /* page 0xb2, thin provisioning page */ 2001 }; 2002 2003 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2004 memcpy(rbuf + 4, pages, sizeof(pages)); 2005 return 0; 2006 } 2007 2008 /** 2009 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2010 * @args: device IDENTIFY data / SCSI command of interest. 2011 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2012 * 2013 * Returns ATA device serial number. 2014 * 2015 * LOCKING: 2016 * spin_lock_irqsave(host lock) 2017 */ 2018 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2019 { 2020 const u8 hdr[] = { 2021 0, 2022 0x80, /* this page code */ 2023 0, 2024 ATA_ID_SERNO_LEN, /* page len */ 2025 }; 2026 2027 memcpy(rbuf, hdr, sizeof(hdr)); 2028 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2029 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2030 return 0; 2031 } 2032 2033 /** 2034 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2035 * @args: device IDENTIFY data / SCSI command of interest. 2036 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2037 * 2038 * Yields two logical unit device identification designators: 2039 * - vendor specific ASCII containing the ATA serial number 2040 * - SAT defined "t10 vendor id based" containing ASCII vendor 2041 * name ("ATA "), model and serial numbers. 2042 * 2043 * LOCKING: 2044 * spin_lock_irqsave(host lock) 2045 */ 2046 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2047 { 2048 const int sat_model_serial_desc_len = 68; 2049 int num; 2050 2051 rbuf[1] = 0x83; /* this page code */ 2052 num = 4; 2053 2054 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2055 rbuf[num + 0] = 2; 2056 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2057 num += 4; 2058 ata_id_string(args->id, (unsigned char *) rbuf + num, 2059 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2060 num += ATA_ID_SERNO_LEN; 2061 2062 /* SAT defined lu model and serial numbers descriptor */ 2063 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2064 rbuf[num + 0] = 2; 2065 rbuf[num + 1] = 1; 2066 rbuf[num + 3] = sat_model_serial_desc_len; 2067 num += 4; 2068 memcpy(rbuf + num, "ATA ", 8); 2069 num += 8; 2070 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2071 ATA_ID_PROD_LEN); 2072 num += ATA_ID_PROD_LEN; 2073 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2074 ATA_ID_SERNO_LEN); 2075 num += ATA_ID_SERNO_LEN; 2076 2077 if (ata_id_has_wwn(args->id)) { 2078 /* SAT defined lu world wide name */ 2079 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2080 rbuf[num + 0] = 1; 2081 rbuf[num + 1] = 3; 2082 rbuf[num + 3] = ATA_ID_WWN_LEN; 2083 num += 4; 2084 ata_id_string(args->id, (unsigned char *) rbuf + num, 2085 ATA_ID_WWN, ATA_ID_WWN_LEN); 2086 num += ATA_ID_WWN_LEN; 2087 } 2088 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2089 return 0; 2090 } 2091 2092 /** 2093 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2094 * @args: device IDENTIFY data / SCSI command of interest. 2095 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2096 * 2097 * Yields SAT-specified ATA VPD page. 2098 * 2099 * LOCKING: 2100 * spin_lock_irqsave(host lock) 2101 */ 2102 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2103 { 2104 struct ata_taskfile tf; 2105 2106 memset(&tf, 0, sizeof(tf)); 2107 2108 rbuf[1] = 0x89; /* our page code */ 2109 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2110 rbuf[3] = (0x238 & 0xff); 2111 2112 memcpy(&rbuf[8], "linux ", 8); 2113 memcpy(&rbuf[16], "libata ", 16); 2114 memcpy(&rbuf[32], DRV_VERSION, 4); 2115 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 2116 2117 /* we don't store the ATA device signature, so we fake it */ 2118 2119 tf.command = ATA_DRDY; /* really, this is Status reg */ 2120 tf.lbal = 0x1; 2121 tf.nsect = 0x1; 2122 2123 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2124 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2125 2126 rbuf[56] = ATA_CMD_ID_ATA; 2127 2128 memcpy(&rbuf[60], &args->id[0], 512); 2129 return 0; 2130 } 2131 2132 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2133 { 2134 u16 min_io_sectors; 2135 2136 rbuf[1] = 0xb0; 2137 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2138 2139 /* 2140 * Optimal transfer length granularity. 2141 * 2142 * This is always one physical block, but for disks with a smaller 2143 * logical than physical sector size we need to figure out what the 2144 * latter is. 2145 */ 2146 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2147 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2148 2149 /* 2150 * Optimal unmap granularity. 2151 * 2152 * The ATA spec doesn't even know about a granularity or alignment 2153 * for the TRIM command. We can leave away most of the unmap related 2154 * VPD page entries, but we have specifify a granularity to signal 2155 * that we support some form of unmap - in thise case via WRITE SAME 2156 * with the unmap bit set. 2157 */ 2158 if (ata_id_has_trim(args->id)) { 2159 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2160 put_unaligned_be32(1, &rbuf[28]); 2161 } 2162 2163 return 0; 2164 } 2165 2166 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2167 { 2168 int form_factor = ata_id_form_factor(args->id); 2169 int media_rotation_rate = ata_id_rotation_rate(args->id); 2170 2171 rbuf[1] = 0xb1; 2172 rbuf[3] = 0x3c; 2173 rbuf[4] = media_rotation_rate >> 8; 2174 rbuf[5] = media_rotation_rate; 2175 rbuf[7] = form_factor; 2176 2177 return 0; 2178 } 2179 2180 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2181 { 2182 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2183 rbuf[1] = 0xb2; 2184 rbuf[3] = 0x4; 2185 rbuf[5] = 1 << 6; /* TPWS */ 2186 2187 return 0; 2188 } 2189 2190 /** 2191 * ata_scsiop_noop - Command handler that simply returns success. 2192 * @args: device IDENTIFY data / SCSI command of interest. 2193 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2194 * 2195 * No operation. Simply returns success to caller, to indicate 2196 * that the caller should successfully complete this SCSI command. 2197 * 2198 * LOCKING: 2199 * spin_lock_irqsave(host lock) 2200 */ 2201 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2202 { 2203 VPRINTK("ENTER\n"); 2204 return 0; 2205 } 2206 2207 /** 2208 * modecpy - Prepare response for MODE SENSE 2209 * @dest: output buffer 2210 * @src: data being copied 2211 * @n: length of mode page 2212 * @changeable: whether changeable parameters are requested 2213 * 2214 * Generate a generic MODE SENSE page for either current or changeable 2215 * parameters. 2216 * 2217 * LOCKING: 2218 * None. 2219 */ 2220 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2221 { 2222 if (changeable) { 2223 memcpy(dest, src, 2); 2224 memset(dest + 2, 0, n - 2); 2225 } else { 2226 memcpy(dest, src, n); 2227 } 2228 } 2229 2230 /** 2231 * ata_msense_caching - Simulate MODE SENSE caching info page 2232 * @id: device IDENTIFY data 2233 * @buf: output buffer 2234 * @changeable: whether changeable parameters are requested 2235 * 2236 * Generate a caching info page, which conditionally indicates 2237 * write caching to the SCSI layer, depending on device 2238 * capabilities. 2239 * 2240 * LOCKING: 2241 * None. 2242 */ 2243 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2244 { 2245 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2246 if (changeable || ata_id_wcache_enabled(id)) 2247 buf[2] |= (1 << 2); /* write cache enable */ 2248 if (!changeable && !ata_id_rahead_enabled(id)) 2249 buf[12] |= (1 << 5); /* disable read ahead */ 2250 return sizeof(def_cache_mpage); 2251 } 2252 2253 /** 2254 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2255 * @buf: output buffer 2256 * @changeable: whether changeable parameters are requested 2257 * 2258 * Generate a generic MODE SENSE control mode page. 2259 * 2260 * LOCKING: 2261 * None. 2262 */ 2263 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2264 { 2265 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2266 return sizeof(def_control_mpage); 2267 } 2268 2269 /** 2270 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2271 * @buf: output buffer 2272 * @changeable: whether changeable parameters are requested 2273 * 2274 * Generate a generic MODE SENSE r/w error recovery page. 2275 * 2276 * LOCKING: 2277 * None. 2278 */ 2279 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2280 { 2281 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2282 changeable); 2283 return sizeof(def_rw_recovery_mpage); 2284 } 2285 2286 /* 2287 * We can turn this into a real blacklist if it's needed, for now just 2288 * blacklist any Maxtor BANC1G10 revision firmware 2289 */ 2290 static int ata_dev_supports_fua(u16 *id) 2291 { 2292 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2293 2294 if (!libata_fua) 2295 return 0; 2296 if (!ata_id_has_fua(id)) 2297 return 0; 2298 2299 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2300 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2301 2302 if (strcmp(model, "Maxtor")) 2303 return 1; 2304 if (strcmp(fw, "BANC1G10")) 2305 return 1; 2306 2307 return 0; /* blacklisted */ 2308 } 2309 2310 /** 2311 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2312 * @args: device IDENTIFY data / SCSI command of interest. 2313 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2314 * 2315 * Simulate MODE SENSE commands. Assume this is invoked for direct 2316 * access devices (e.g. disks) only. There should be no block 2317 * descriptor for other device types. 2318 * 2319 * LOCKING: 2320 * spin_lock_irqsave(host lock) 2321 */ 2322 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2323 { 2324 struct ata_device *dev = args->dev; 2325 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2326 const u8 sat_blk_desc[] = { 2327 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2328 0, 2329 0, 0x2, 0x0 /* block length: 512 bytes */ 2330 }; 2331 u8 pg, spg; 2332 unsigned int ebd, page_control, six_byte; 2333 u8 dpofua; 2334 2335 VPRINTK("ENTER\n"); 2336 2337 six_byte = (scsicmd[0] == MODE_SENSE); 2338 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2339 /* 2340 * LLBA bit in msense(10) ignored (compliant) 2341 */ 2342 2343 page_control = scsicmd[2] >> 6; 2344 switch (page_control) { 2345 case 0: /* current */ 2346 case 1: /* changeable */ 2347 case 2: /* defaults */ 2348 break; /* supported */ 2349 case 3: /* saved */ 2350 goto saving_not_supp; 2351 default: 2352 goto invalid_fld; 2353 } 2354 2355 if (six_byte) 2356 p += 4 + (ebd ? 8 : 0); 2357 else 2358 p += 8 + (ebd ? 8 : 0); 2359 2360 pg = scsicmd[2] & 0x3f; 2361 spg = scsicmd[3]; 2362 /* 2363 * No mode subpages supported (yet) but asking for _all_ 2364 * subpages may be valid 2365 */ 2366 if (spg && (spg != ALL_SUB_MPAGES)) 2367 goto invalid_fld; 2368 2369 switch(pg) { 2370 case RW_RECOVERY_MPAGE: 2371 p += ata_msense_rw_recovery(p, page_control == 1); 2372 break; 2373 2374 case CACHE_MPAGE: 2375 p += ata_msense_caching(args->id, p, page_control == 1); 2376 break; 2377 2378 case CONTROL_MPAGE: 2379 p += ata_msense_ctl_mode(p, page_control == 1); 2380 break; 2381 2382 case ALL_MPAGES: 2383 p += ata_msense_rw_recovery(p, page_control == 1); 2384 p += ata_msense_caching(args->id, p, page_control == 1); 2385 p += ata_msense_ctl_mode(p, page_control == 1); 2386 break; 2387 2388 default: /* invalid page code */ 2389 goto invalid_fld; 2390 } 2391 2392 dpofua = 0; 2393 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2394 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2395 dpofua = 1 << 4; 2396 2397 if (six_byte) { 2398 rbuf[0] = p - rbuf - 1; 2399 rbuf[2] |= dpofua; 2400 if (ebd) { 2401 rbuf[3] = sizeof(sat_blk_desc); 2402 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2403 } 2404 } else { 2405 unsigned int output_len = p - rbuf - 2; 2406 2407 rbuf[0] = output_len >> 8; 2408 rbuf[1] = output_len; 2409 rbuf[3] |= dpofua; 2410 if (ebd) { 2411 rbuf[7] = sizeof(sat_blk_desc); 2412 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2413 } 2414 } 2415 return 0; 2416 2417 invalid_fld: 2418 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2419 /* "Invalid field in cbd" */ 2420 return 1; 2421 2422 saving_not_supp: 2423 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2424 /* "Saving parameters not supported" */ 2425 return 1; 2426 } 2427 2428 /** 2429 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2430 * @args: device IDENTIFY data / SCSI command of interest. 2431 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2432 * 2433 * Simulate READ CAPACITY commands. 2434 * 2435 * LOCKING: 2436 * None. 2437 */ 2438 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2439 { 2440 struct ata_device *dev = args->dev; 2441 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2442 u32 sector_size; /* physical sector size in bytes */ 2443 u8 log2_per_phys; 2444 u16 lowest_aligned; 2445 2446 sector_size = ata_id_logical_sector_size(dev->id); 2447 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2448 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2449 2450 VPRINTK("ENTER\n"); 2451 2452 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2453 if (last_lba >= 0xffffffffULL) 2454 last_lba = 0xffffffff; 2455 2456 /* sector count, 32-bit */ 2457 rbuf[0] = last_lba >> (8 * 3); 2458 rbuf[1] = last_lba >> (8 * 2); 2459 rbuf[2] = last_lba >> (8 * 1); 2460 rbuf[3] = last_lba; 2461 2462 /* sector size */ 2463 rbuf[4] = sector_size >> (8 * 3); 2464 rbuf[5] = sector_size >> (8 * 2); 2465 rbuf[6] = sector_size >> (8 * 1); 2466 rbuf[7] = sector_size; 2467 } else { 2468 /* sector count, 64-bit */ 2469 rbuf[0] = last_lba >> (8 * 7); 2470 rbuf[1] = last_lba >> (8 * 6); 2471 rbuf[2] = last_lba >> (8 * 5); 2472 rbuf[3] = last_lba >> (8 * 4); 2473 rbuf[4] = last_lba >> (8 * 3); 2474 rbuf[5] = last_lba >> (8 * 2); 2475 rbuf[6] = last_lba >> (8 * 1); 2476 rbuf[7] = last_lba; 2477 2478 /* sector size */ 2479 rbuf[ 8] = sector_size >> (8 * 3); 2480 rbuf[ 9] = sector_size >> (8 * 2); 2481 rbuf[10] = sector_size >> (8 * 1); 2482 rbuf[11] = sector_size; 2483 2484 rbuf[12] = 0; 2485 rbuf[13] = log2_per_phys; 2486 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2487 rbuf[15] = lowest_aligned; 2488 2489 if (ata_id_has_trim(args->id)) { 2490 rbuf[14] |= 0x80; /* TPE */ 2491 2492 if (ata_id_has_zero_after_trim(args->id)) 2493 rbuf[14] |= 0x40; /* TPRZ */ 2494 } 2495 } 2496 2497 return 0; 2498 } 2499 2500 /** 2501 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2502 * @args: device IDENTIFY data / SCSI command of interest. 2503 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2504 * 2505 * Simulate REPORT LUNS command. 2506 * 2507 * LOCKING: 2508 * spin_lock_irqsave(host lock) 2509 */ 2510 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2511 { 2512 VPRINTK("ENTER\n"); 2513 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2514 2515 return 0; 2516 } 2517 2518 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2519 { 2520 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2521 /* FIXME: not quite right; we don't want the 2522 * translation of taskfile registers into 2523 * a sense descriptors, since that's only 2524 * correct for ATA, not ATAPI 2525 */ 2526 ata_gen_passthru_sense(qc); 2527 } 2528 2529 qc->scsidone(qc->scsicmd); 2530 ata_qc_free(qc); 2531 } 2532 2533 /* is it pointless to prefer PIO for "safety reasons"? */ 2534 static inline int ata_pio_use_silly(struct ata_port *ap) 2535 { 2536 return (ap->flags & ATA_FLAG_PIO_DMA); 2537 } 2538 2539 static void atapi_request_sense(struct ata_queued_cmd *qc) 2540 { 2541 struct ata_port *ap = qc->ap; 2542 struct scsi_cmnd *cmd = qc->scsicmd; 2543 2544 DPRINTK("ATAPI request sense\n"); 2545 2546 /* FIXME: is this needed? */ 2547 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2548 2549 #ifdef CONFIG_ATA_SFF 2550 if (ap->ops->sff_tf_read) 2551 ap->ops->sff_tf_read(ap, &qc->tf); 2552 #endif 2553 2554 /* fill these in, for the case where they are -not- overwritten */ 2555 cmd->sense_buffer[0] = 0x70; 2556 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2557 2558 ata_qc_reinit(qc); 2559 2560 /* setup sg table and init transfer direction */ 2561 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2562 ata_sg_init(qc, &qc->sgent, 1); 2563 qc->dma_dir = DMA_FROM_DEVICE; 2564 2565 memset(&qc->cdb, 0, qc->dev->cdb_len); 2566 qc->cdb[0] = REQUEST_SENSE; 2567 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2568 2569 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2570 qc->tf.command = ATA_CMD_PACKET; 2571 2572 if (ata_pio_use_silly(ap)) { 2573 qc->tf.protocol = ATAPI_PROT_DMA; 2574 qc->tf.feature |= ATAPI_PKT_DMA; 2575 } else { 2576 qc->tf.protocol = ATAPI_PROT_PIO; 2577 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2578 qc->tf.lbah = 0; 2579 } 2580 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2581 2582 qc->complete_fn = atapi_sense_complete; 2583 2584 ata_qc_issue(qc); 2585 2586 DPRINTK("EXIT\n"); 2587 } 2588 2589 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2590 { 2591 struct scsi_cmnd *cmd = qc->scsicmd; 2592 unsigned int err_mask = qc->err_mask; 2593 2594 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2595 2596 /* handle completion from new EH */ 2597 if (unlikely(qc->ap->ops->error_handler && 2598 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2599 2600 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2601 /* FIXME: not quite right; we don't want the 2602 * translation of taskfile registers into a 2603 * sense descriptors, since that's only 2604 * correct for ATA, not ATAPI 2605 */ 2606 ata_gen_passthru_sense(qc); 2607 } 2608 2609 /* SCSI EH automatically locks door if sdev->locked is 2610 * set. Sometimes door lock request continues to 2611 * fail, for example, when no media is present. This 2612 * creates a loop - SCSI EH issues door lock which 2613 * fails and gets invoked again to acquire sense data 2614 * for the failed command. 2615 * 2616 * If door lock fails, always clear sdev->locked to 2617 * avoid this infinite loop. 2618 * 2619 * This may happen before SCSI scan is complete. Make 2620 * sure qc->dev->sdev isn't NULL before dereferencing. 2621 */ 2622 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2623 qc->dev->sdev->locked = 0; 2624 2625 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2626 qc->scsidone(cmd); 2627 ata_qc_free(qc); 2628 return; 2629 } 2630 2631 /* successful completion or old EH failure path */ 2632 if (unlikely(err_mask & AC_ERR_DEV)) { 2633 cmd->result = SAM_STAT_CHECK_CONDITION; 2634 atapi_request_sense(qc); 2635 return; 2636 } else if (unlikely(err_mask)) { 2637 /* FIXME: not quite right; we don't want the 2638 * translation of taskfile registers into 2639 * a sense descriptors, since that's only 2640 * correct for ATA, not ATAPI 2641 */ 2642 ata_gen_passthru_sense(qc); 2643 } else { 2644 u8 *scsicmd = cmd->cmnd; 2645 2646 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2647 unsigned long flags; 2648 u8 *buf; 2649 2650 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2651 2652 /* ATAPI devices typically report zero for their SCSI version, 2653 * and sometimes deviate from the spec WRT response data 2654 * format. If SCSI version is reported as zero like normal, 2655 * then we make the following fixups: 1) Fake MMC-5 version, 2656 * to indicate to the Linux scsi midlayer this is a modern 2657 * device. 2) Ensure response data format / ATAPI information 2658 * are always correct. 2659 */ 2660 if (buf[2] == 0) { 2661 buf[2] = 0x5; 2662 buf[3] = 0x32; 2663 } 2664 2665 ata_scsi_rbuf_put(cmd, true, &flags); 2666 } 2667 2668 cmd->result = SAM_STAT_GOOD; 2669 } 2670 2671 qc->scsidone(cmd); 2672 ata_qc_free(qc); 2673 } 2674 /** 2675 * atapi_xlat - Initialize PACKET taskfile 2676 * @qc: command structure to be initialized 2677 * 2678 * LOCKING: 2679 * spin_lock_irqsave(host lock) 2680 * 2681 * RETURNS: 2682 * Zero on success, non-zero on failure. 2683 */ 2684 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2685 { 2686 struct scsi_cmnd *scmd = qc->scsicmd; 2687 struct ata_device *dev = qc->dev; 2688 int nodata = (scmd->sc_data_direction == DMA_NONE); 2689 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2690 unsigned int nbytes; 2691 2692 memset(qc->cdb, 0, dev->cdb_len); 2693 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2694 2695 qc->complete_fn = atapi_qc_complete; 2696 2697 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2698 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2699 qc->tf.flags |= ATA_TFLAG_WRITE; 2700 DPRINTK("direction: write\n"); 2701 } 2702 2703 qc->tf.command = ATA_CMD_PACKET; 2704 ata_qc_set_pc_nbytes(qc); 2705 2706 /* check whether ATAPI DMA is safe */ 2707 if (!nodata && !using_pio && atapi_check_dma(qc)) 2708 using_pio = 1; 2709 2710 /* Some controller variants snoop this value for Packet 2711 * transfers to do state machine and FIFO management. Thus we 2712 * want to set it properly, and for DMA where it is 2713 * effectively meaningless. 2714 */ 2715 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2716 2717 /* Most ATAPI devices which honor transfer chunk size don't 2718 * behave according to the spec when odd chunk size which 2719 * matches the transfer length is specified. If the number of 2720 * bytes to transfer is 2n+1. According to the spec, what 2721 * should happen is to indicate that 2n+1 is going to be 2722 * transferred and transfer 2n+2 bytes where the last byte is 2723 * padding. 2724 * 2725 * In practice, this doesn't happen. ATAPI devices first 2726 * indicate and transfer 2n bytes and then indicate and 2727 * transfer 2 bytes where the last byte is padding. 2728 * 2729 * This inconsistency confuses several controllers which 2730 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2731 * These controllers use actual number of transferred bytes to 2732 * update DMA poitner and transfer of 4n+2 bytes make those 2733 * controller push DMA pointer by 4n+4 bytes because SATA data 2734 * FISes are aligned to 4 bytes. This causes data corruption 2735 * and buffer overrun. 2736 * 2737 * Always setting nbytes to even number solves this problem 2738 * because then ATAPI devices don't have to split data at 2n 2739 * boundaries. 2740 */ 2741 if (nbytes & 0x1) 2742 nbytes++; 2743 2744 qc->tf.lbam = (nbytes & 0xFF); 2745 qc->tf.lbah = (nbytes >> 8); 2746 2747 if (nodata) 2748 qc->tf.protocol = ATAPI_PROT_NODATA; 2749 else if (using_pio) 2750 qc->tf.protocol = ATAPI_PROT_PIO; 2751 else { 2752 /* DMA data xfer */ 2753 qc->tf.protocol = ATAPI_PROT_DMA; 2754 qc->tf.feature |= ATAPI_PKT_DMA; 2755 2756 if ((dev->flags & ATA_DFLAG_DMADIR) && 2757 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2758 /* some SATA bridges need us to indicate data xfer direction */ 2759 qc->tf.feature |= ATAPI_DMADIR; 2760 } 2761 2762 2763 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2764 as ATAPI tape drives don't get this right otherwise */ 2765 return 0; 2766 } 2767 2768 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2769 { 2770 if (!sata_pmp_attached(ap)) { 2771 if (likely(devno < ata_link_max_devices(&ap->link))) 2772 return &ap->link.device[devno]; 2773 } else { 2774 if (likely(devno < ap->nr_pmp_links)) 2775 return &ap->pmp_link[devno].device[0]; 2776 } 2777 2778 return NULL; 2779 } 2780 2781 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2782 const struct scsi_device *scsidev) 2783 { 2784 int devno; 2785 2786 /* skip commands not addressed to targets we simulate */ 2787 if (!sata_pmp_attached(ap)) { 2788 if (unlikely(scsidev->channel || scsidev->lun)) 2789 return NULL; 2790 devno = scsidev->id; 2791 } else { 2792 if (unlikely(scsidev->id || scsidev->lun)) 2793 return NULL; 2794 devno = scsidev->channel; 2795 } 2796 2797 return ata_find_dev(ap, devno); 2798 } 2799 2800 /** 2801 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2802 * @ap: ATA port to which the device is attached 2803 * @scsidev: SCSI device from which we derive the ATA device 2804 * 2805 * Given various information provided in struct scsi_cmnd, 2806 * map that onto an ATA bus, and using that mapping 2807 * determine which ata_device is associated with the 2808 * SCSI command to be sent. 2809 * 2810 * LOCKING: 2811 * spin_lock_irqsave(host lock) 2812 * 2813 * RETURNS: 2814 * Associated ATA device, or %NULL if not found. 2815 */ 2816 static struct ata_device * 2817 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2818 { 2819 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2820 2821 if (unlikely(!dev || !ata_dev_enabled(dev))) 2822 return NULL; 2823 2824 return dev; 2825 } 2826 2827 /* 2828 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2829 * @byte1: Byte 1 from pass-thru CDB. 2830 * 2831 * RETURNS: 2832 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2833 */ 2834 static u8 2835 ata_scsi_map_proto(u8 byte1) 2836 { 2837 switch((byte1 & 0x1e) >> 1) { 2838 case 3: /* Non-data */ 2839 return ATA_PROT_NODATA; 2840 2841 case 6: /* DMA */ 2842 case 10: /* UDMA Data-in */ 2843 case 11: /* UDMA Data-Out */ 2844 return ATA_PROT_DMA; 2845 2846 case 4: /* PIO Data-in */ 2847 case 5: /* PIO Data-out */ 2848 return ATA_PROT_PIO; 2849 2850 case 0: /* Hard Reset */ 2851 case 1: /* SRST */ 2852 case 8: /* Device Diagnostic */ 2853 case 9: /* Device Reset */ 2854 case 7: /* DMA Queued */ 2855 case 12: /* FPDMA */ 2856 case 15: /* Return Response Info */ 2857 default: /* Reserved */ 2858 break; 2859 } 2860 2861 return ATA_PROT_UNKNOWN; 2862 } 2863 2864 /** 2865 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2866 * @qc: command structure to be initialized 2867 * 2868 * Handles either 12 or 16-byte versions of the CDB. 2869 * 2870 * RETURNS: 2871 * Zero on success, non-zero on failure. 2872 */ 2873 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2874 { 2875 struct ata_taskfile *tf = &(qc->tf); 2876 struct scsi_cmnd *scmd = qc->scsicmd; 2877 struct ata_device *dev = qc->dev; 2878 const u8 *cdb = scmd->cmnd; 2879 2880 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2881 goto invalid_fld; 2882 2883 /* 2884 * 12 and 16 byte CDBs use different offsets to 2885 * provide the various register values. 2886 */ 2887 if (cdb[0] == ATA_16) { 2888 /* 2889 * 16-byte CDB - may contain extended commands. 2890 * 2891 * If that is the case, copy the upper byte register values. 2892 */ 2893 if (cdb[1] & 0x01) { 2894 tf->hob_feature = cdb[3]; 2895 tf->hob_nsect = cdb[5]; 2896 tf->hob_lbal = cdb[7]; 2897 tf->hob_lbam = cdb[9]; 2898 tf->hob_lbah = cdb[11]; 2899 tf->flags |= ATA_TFLAG_LBA48; 2900 } else 2901 tf->flags &= ~ATA_TFLAG_LBA48; 2902 2903 /* 2904 * Always copy low byte, device and command registers. 2905 */ 2906 tf->feature = cdb[4]; 2907 tf->nsect = cdb[6]; 2908 tf->lbal = cdb[8]; 2909 tf->lbam = cdb[10]; 2910 tf->lbah = cdb[12]; 2911 tf->device = cdb[13]; 2912 tf->command = cdb[14]; 2913 } else { 2914 /* 2915 * 12-byte CDB - incapable of extended commands. 2916 */ 2917 tf->flags &= ~ATA_TFLAG_LBA48; 2918 2919 tf->feature = cdb[3]; 2920 tf->nsect = cdb[4]; 2921 tf->lbal = cdb[5]; 2922 tf->lbam = cdb[6]; 2923 tf->lbah = cdb[7]; 2924 tf->device = cdb[8]; 2925 tf->command = cdb[9]; 2926 } 2927 2928 /* enforce correct master/slave bit */ 2929 tf->device = dev->devno ? 2930 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2931 2932 switch (tf->command) { 2933 /* READ/WRITE LONG use a non-standard sect_size */ 2934 case ATA_CMD_READ_LONG: 2935 case ATA_CMD_READ_LONG_ONCE: 2936 case ATA_CMD_WRITE_LONG: 2937 case ATA_CMD_WRITE_LONG_ONCE: 2938 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2939 goto invalid_fld; 2940 qc->sect_size = scsi_bufflen(scmd); 2941 break; 2942 2943 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2944 case ATA_CMD_CFA_WRITE_NE: 2945 case ATA_CMD_CFA_TRANS_SECT: 2946 case ATA_CMD_CFA_WRITE_MULT_NE: 2947 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2948 case ATA_CMD_READ: 2949 case ATA_CMD_READ_EXT: 2950 case ATA_CMD_READ_QUEUED: 2951 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2952 case ATA_CMD_FPDMA_READ: 2953 case ATA_CMD_READ_MULTI: 2954 case ATA_CMD_READ_MULTI_EXT: 2955 case ATA_CMD_PIO_READ: 2956 case ATA_CMD_PIO_READ_EXT: 2957 case ATA_CMD_READ_STREAM_DMA_EXT: 2958 case ATA_CMD_READ_STREAM_EXT: 2959 case ATA_CMD_VERIFY: 2960 case ATA_CMD_VERIFY_EXT: 2961 case ATA_CMD_WRITE: 2962 case ATA_CMD_WRITE_EXT: 2963 case ATA_CMD_WRITE_FUA_EXT: 2964 case ATA_CMD_WRITE_QUEUED: 2965 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2966 case ATA_CMD_FPDMA_WRITE: 2967 case ATA_CMD_WRITE_MULTI: 2968 case ATA_CMD_WRITE_MULTI_EXT: 2969 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2970 case ATA_CMD_PIO_WRITE: 2971 case ATA_CMD_PIO_WRITE_EXT: 2972 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2973 case ATA_CMD_WRITE_STREAM_EXT: 2974 qc->sect_size = scmd->device->sector_size; 2975 break; 2976 2977 /* Everything else uses 512 byte "sectors" */ 2978 default: 2979 qc->sect_size = ATA_SECT_SIZE; 2980 } 2981 2982 /* 2983 * Set flags so that all registers will be written, pass on 2984 * write indication (used for PIO/DMA setup), result TF is 2985 * copied back and we don't whine too much about its failure. 2986 */ 2987 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2988 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2989 tf->flags |= ATA_TFLAG_WRITE; 2990 2991 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 2992 2993 /* 2994 * Set transfer length. 2995 * 2996 * TODO: find out if we need to do more here to 2997 * cover scatter/gather case. 2998 */ 2999 ata_qc_set_pc_nbytes(qc); 3000 3001 /* We may not issue DMA commands if no DMA mode is set */ 3002 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3003 goto invalid_fld; 3004 3005 /* sanity check for pio multi commands */ 3006 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3007 goto invalid_fld; 3008 3009 if (is_multi_taskfile(tf)) { 3010 unsigned int multi_count = 1 << (cdb[1] >> 5); 3011 3012 /* compare the passed through multi_count 3013 * with the cached multi_count of libata 3014 */ 3015 if (multi_count != dev->multi_count) 3016 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3017 multi_count); 3018 } 3019 3020 /* 3021 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3022 * SET_FEATURES - XFER MODE must be preceded/succeeded 3023 * by an update to hardware-specific registers for each 3024 * controller (i.e. the reason for ->set_piomode(), 3025 * ->set_dmamode(), and ->post_set_mode() hooks). 3026 */ 3027 if (tf->command == ATA_CMD_SET_FEATURES && 3028 tf->feature == SETFEATURES_XFER) 3029 goto invalid_fld; 3030 3031 /* 3032 * Filter TPM commands by default. These provide an 3033 * essentially uncontrolled encrypted "back door" between 3034 * applications and the disk. Set libata.allow_tpm=1 if you 3035 * have a real reason for wanting to use them. This ensures 3036 * that installed software cannot easily mess stuff up without 3037 * user intent. DVR type users will probably ship with this enabled 3038 * for movie content management. 3039 * 3040 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3041 * for this and should do in future but that it is not sufficient as 3042 * DCS is an optional feature set. Thus we also do the software filter 3043 * so that we comply with the TC consortium stated goal that the user 3044 * can turn off TC features of their system. 3045 */ 3046 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3047 goto invalid_fld; 3048 3049 return 0; 3050 3051 invalid_fld: 3052 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3053 /* "Invalid field in cdb" */ 3054 return 1; 3055 } 3056 3057 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3058 { 3059 struct ata_taskfile *tf = &qc->tf; 3060 struct scsi_cmnd *scmd = qc->scsicmd; 3061 struct ata_device *dev = qc->dev; 3062 const u8 *cdb = scmd->cmnd; 3063 u64 block; 3064 u32 n_block; 3065 u32 size; 3066 void *buf; 3067 3068 /* we may not issue DMA commands if no DMA mode is set */ 3069 if (unlikely(!dev->dma_mode)) 3070 goto invalid_fld; 3071 3072 if (unlikely(scmd->cmd_len < 16)) 3073 goto invalid_fld; 3074 scsi_16_lba_len(cdb, &block, &n_block); 3075 3076 /* for now we only support WRITE SAME with the unmap bit set */ 3077 if (unlikely(!(cdb[1] & 0x8))) 3078 goto invalid_fld; 3079 3080 /* 3081 * WRITE SAME always has a sector sized buffer as payload, this 3082 * should never be a multiple entry S/G list. 3083 */ 3084 if (!scsi_sg_count(scmd)) 3085 goto invalid_fld; 3086 3087 buf = page_address(sg_page(scsi_sglist(scmd))); 3088 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3089 3090 tf->protocol = ATA_PROT_DMA; 3091 tf->hob_feature = 0; 3092 tf->feature = ATA_DSM_TRIM; 3093 tf->hob_nsect = (size / 512) >> 8; 3094 tf->nsect = size / 512; 3095 tf->command = ATA_CMD_DSM; 3096 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3097 ATA_TFLAG_WRITE; 3098 3099 ata_qc_set_pc_nbytes(qc); 3100 3101 return 0; 3102 3103 invalid_fld: 3104 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3105 /* "Invalid field in cdb" */ 3106 return 1; 3107 } 3108 3109 /** 3110 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3111 * @qc: Storage for translated ATA taskfile 3112 * @buf: input buffer 3113 * @len: number of valid bytes in the input buffer 3114 * 3115 * Prepare a taskfile to modify caching information for the device. 3116 * 3117 * LOCKING: 3118 * None. 3119 */ 3120 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3121 const u8 *buf, int len) 3122 { 3123 struct ata_taskfile *tf = &qc->tf; 3124 struct ata_device *dev = qc->dev; 3125 char mpage[CACHE_MPAGE_LEN]; 3126 u8 wce; 3127 3128 /* 3129 * The first two bytes of def_cache_mpage are a header, so offsets 3130 * in mpage are off by 2 compared to buf. Same for len. 3131 */ 3132 3133 if (len != CACHE_MPAGE_LEN - 2) 3134 return -EINVAL; 3135 3136 wce = buf[0] & (1 << 2); 3137 3138 /* 3139 * Check that read-only bits are not modified. 3140 */ 3141 ata_msense_caching(dev->id, mpage, false); 3142 mpage[2] &= ~(1 << 2); 3143 mpage[2] |= wce; 3144 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3145 return -EINVAL; 3146 3147 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3148 tf->protocol = ATA_PROT_NODATA; 3149 tf->nsect = 0; 3150 tf->command = ATA_CMD_SET_FEATURES; 3151 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3152 return 0; 3153 } 3154 3155 /** 3156 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3157 * @qc: Storage for translated ATA taskfile 3158 * 3159 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3160 * Assume this is invoked for direct access devices (e.g. disks) only. 3161 * There should be no block descriptor for other device types. 3162 * 3163 * LOCKING: 3164 * spin_lock_irqsave(host lock) 3165 */ 3166 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3167 { 3168 struct scsi_cmnd *scmd = qc->scsicmd; 3169 const u8 *cdb = scmd->cmnd; 3170 const u8 *p; 3171 u8 pg, spg; 3172 unsigned six_byte, pg_len, hdr_len, bd_len; 3173 int len; 3174 3175 VPRINTK("ENTER\n"); 3176 3177 six_byte = (cdb[0] == MODE_SELECT); 3178 if (six_byte) { 3179 if (scmd->cmd_len < 5) 3180 goto invalid_fld; 3181 3182 len = cdb[4]; 3183 hdr_len = 4; 3184 } else { 3185 if (scmd->cmd_len < 9) 3186 goto invalid_fld; 3187 3188 len = (cdb[7] << 8) + cdb[8]; 3189 hdr_len = 8; 3190 } 3191 3192 /* We only support PF=1, SP=0. */ 3193 if ((cdb[1] & 0x11) != 0x10) 3194 goto invalid_fld; 3195 3196 /* Test early for possible overrun. */ 3197 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3198 goto invalid_param_len; 3199 3200 p = page_address(sg_page(scsi_sglist(scmd))); 3201 3202 /* Move past header and block descriptors. */ 3203 if (len < hdr_len) 3204 goto invalid_param_len; 3205 3206 if (six_byte) 3207 bd_len = p[3]; 3208 else 3209 bd_len = (p[6] << 8) + p[7]; 3210 3211 len -= hdr_len; 3212 p += hdr_len; 3213 if (len < bd_len) 3214 goto invalid_param_len; 3215 if (bd_len != 0 && bd_len != 8) 3216 goto invalid_param; 3217 3218 len -= bd_len; 3219 p += bd_len; 3220 if (len == 0) 3221 goto skip; 3222 3223 /* Parse both possible formats for the mode page headers. */ 3224 pg = p[0] & 0x3f; 3225 if (p[0] & 0x40) { 3226 if (len < 4) 3227 goto invalid_param_len; 3228 3229 spg = p[1]; 3230 pg_len = (p[2] << 8) | p[3]; 3231 p += 4; 3232 len -= 4; 3233 } else { 3234 if (len < 2) 3235 goto invalid_param_len; 3236 3237 spg = 0; 3238 pg_len = p[1]; 3239 p += 2; 3240 len -= 2; 3241 } 3242 3243 /* 3244 * No mode subpages supported (yet) but asking for _all_ 3245 * subpages may be valid 3246 */ 3247 if (spg && (spg != ALL_SUB_MPAGES)) 3248 goto invalid_param; 3249 if (pg_len > len) 3250 goto invalid_param_len; 3251 3252 switch (pg) { 3253 case CACHE_MPAGE: 3254 if (ata_mselect_caching(qc, p, pg_len) < 0) 3255 goto invalid_param; 3256 break; 3257 3258 default: /* invalid page code */ 3259 goto invalid_param; 3260 } 3261 3262 /* 3263 * Only one page has changeable data, so we only support setting one 3264 * page at a time. 3265 */ 3266 if (len > pg_len) 3267 goto invalid_param; 3268 3269 return 0; 3270 3271 invalid_fld: 3272 /* "Invalid field in CDB" */ 3273 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3274 return 1; 3275 3276 invalid_param: 3277 /* "Invalid field in parameter list" */ 3278 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3279 return 1; 3280 3281 invalid_param_len: 3282 /* "Parameter list length error" */ 3283 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3284 return 1; 3285 3286 skip: 3287 scmd->result = SAM_STAT_GOOD; 3288 return 1; 3289 } 3290 3291 /** 3292 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3293 * @dev: ATA device 3294 * @cmd: SCSI command opcode to consider 3295 * 3296 * Look up the SCSI command given, and determine whether the 3297 * SCSI command is to be translated or simulated. 3298 * 3299 * RETURNS: 3300 * Pointer to translation function if possible, %NULL if not. 3301 */ 3302 3303 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3304 { 3305 switch (cmd) { 3306 case READ_6: 3307 case READ_10: 3308 case READ_16: 3309 3310 case WRITE_6: 3311 case WRITE_10: 3312 case WRITE_16: 3313 return ata_scsi_rw_xlat; 3314 3315 case WRITE_SAME_16: 3316 return ata_scsi_write_same_xlat; 3317 3318 case SYNCHRONIZE_CACHE: 3319 if (ata_try_flush_cache(dev)) 3320 return ata_scsi_flush_xlat; 3321 break; 3322 3323 case VERIFY: 3324 case VERIFY_16: 3325 return ata_scsi_verify_xlat; 3326 3327 case ATA_12: 3328 case ATA_16: 3329 return ata_scsi_pass_thru; 3330 3331 case MODE_SELECT: 3332 case MODE_SELECT_10: 3333 return ata_scsi_mode_select_xlat; 3334 break; 3335 3336 case START_STOP: 3337 return ata_scsi_start_stop_xlat; 3338 } 3339 3340 return NULL; 3341 } 3342 3343 /** 3344 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3345 * @ap: ATA port to which the command was being sent 3346 * @cmd: SCSI command to dump 3347 * 3348 * Prints the contents of a SCSI command via printk(). 3349 */ 3350 3351 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3352 struct scsi_cmnd *cmd) 3353 { 3354 #ifdef ATA_DEBUG 3355 struct scsi_device *scsidev = cmd->device; 3356 u8 *scsicmd = cmd->cmnd; 3357 3358 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3359 ap->print_id, 3360 scsidev->channel, scsidev->id, scsidev->lun, 3361 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3362 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3363 scsicmd[8]); 3364 #endif 3365 } 3366 3367 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3368 struct ata_device *dev) 3369 { 3370 u8 scsi_op = scmd->cmnd[0]; 3371 ata_xlat_func_t xlat_func; 3372 int rc = 0; 3373 3374 if (dev->class == ATA_DEV_ATA) { 3375 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3376 goto bad_cdb_len; 3377 3378 xlat_func = ata_get_xlat_func(dev, scsi_op); 3379 } else { 3380 if (unlikely(!scmd->cmd_len)) 3381 goto bad_cdb_len; 3382 3383 xlat_func = NULL; 3384 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3385 /* relay SCSI command to ATAPI device */ 3386 int len = COMMAND_SIZE(scsi_op); 3387 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3388 goto bad_cdb_len; 3389 3390 xlat_func = atapi_xlat; 3391 } else { 3392 /* ATA_16 passthru, treat as an ATA command */ 3393 if (unlikely(scmd->cmd_len > 16)) 3394 goto bad_cdb_len; 3395 3396 xlat_func = ata_get_xlat_func(dev, scsi_op); 3397 } 3398 } 3399 3400 if (xlat_func) 3401 rc = ata_scsi_translate(dev, scmd, xlat_func); 3402 else 3403 ata_scsi_simulate(dev, scmd); 3404 3405 return rc; 3406 3407 bad_cdb_len: 3408 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3409 scmd->cmd_len, scsi_op, dev->cdb_len); 3410 scmd->result = DID_ERROR << 16; 3411 scmd->scsi_done(scmd); 3412 return 0; 3413 } 3414 3415 /** 3416 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3417 * @shost: SCSI host of command to be sent 3418 * @cmd: SCSI command to be sent 3419 * 3420 * In some cases, this function translates SCSI commands into 3421 * ATA taskfiles, and queues the taskfiles to be sent to 3422 * hardware. In other cases, this function simulates a 3423 * SCSI device by evaluating and responding to certain 3424 * SCSI commands. This creates the overall effect of 3425 * ATA and ATAPI devices appearing as SCSI devices. 3426 * 3427 * LOCKING: 3428 * ATA host lock 3429 * 3430 * RETURNS: 3431 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3432 * 0 otherwise. 3433 */ 3434 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3435 { 3436 struct ata_port *ap; 3437 struct ata_device *dev; 3438 struct scsi_device *scsidev = cmd->device; 3439 int rc = 0; 3440 unsigned long irq_flags; 3441 3442 ap = ata_shost_to_port(shost); 3443 3444 spin_lock_irqsave(ap->lock, irq_flags); 3445 3446 ata_scsi_dump_cdb(ap, cmd); 3447 3448 dev = ata_scsi_find_dev(ap, scsidev); 3449 if (likely(dev)) 3450 rc = __ata_scsi_queuecmd(cmd, dev); 3451 else { 3452 cmd->result = (DID_BAD_TARGET << 16); 3453 cmd->scsi_done(cmd); 3454 } 3455 3456 spin_unlock_irqrestore(ap->lock, irq_flags); 3457 3458 return rc; 3459 } 3460 3461 /** 3462 * ata_scsi_simulate - simulate SCSI command on ATA device 3463 * @dev: the target device 3464 * @cmd: SCSI command being sent to device. 3465 * 3466 * Interprets and directly executes a select list of SCSI commands 3467 * that can be handled internally. 3468 * 3469 * LOCKING: 3470 * spin_lock_irqsave(host lock) 3471 */ 3472 3473 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3474 { 3475 struct ata_scsi_args args; 3476 const u8 *scsicmd = cmd->cmnd; 3477 u8 tmp8; 3478 3479 args.dev = dev; 3480 args.id = dev->id; 3481 args.cmd = cmd; 3482 args.done = cmd->scsi_done; 3483 3484 switch(scsicmd[0]) { 3485 /* TODO: worth improving? */ 3486 case FORMAT_UNIT: 3487 ata_scsi_invalid_field(cmd); 3488 break; 3489 3490 case INQUIRY: 3491 if (scsicmd[1] & 2) /* is CmdDt set? */ 3492 ata_scsi_invalid_field(cmd); 3493 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3494 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3495 else switch (scsicmd[2]) { 3496 case 0x00: 3497 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3498 break; 3499 case 0x80: 3500 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3501 break; 3502 case 0x83: 3503 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3504 break; 3505 case 0x89: 3506 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3507 break; 3508 case 0xb0: 3509 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3510 break; 3511 case 0xb1: 3512 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3513 break; 3514 case 0xb2: 3515 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3516 break; 3517 default: 3518 ata_scsi_invalid_field(cmd); 3519 break; 3520 } 3521 break; 3522 3523 case MODE_SENSE: 3524 case MODE_SENSE_10: 3525 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3526 break; 3527 3528 case READ_CAPACITY: 3529 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3530 break; 3531 3532 case SERVICE_ACTION_IN: 3533 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3534 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3535 else 3536 ata_scsi_invalid_field(cmd); 3537 break; 3538 3539 case REPORT_LUNS: 3540 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3541 break; 3542 3543 case REQUEST_SENSE: 3544 ata_scsi_set_sense(cmd, 0, 0, 0); 3545 cmd->result = (DRIVER_SENSE << 24); 3546 cmd->scsi_done(cmd); 3547 break; 3548 3549 /* if we reach this, then writeback caching is disabled, 3550 * turning this into a no-op. 3551 */ 3552 case SYNCHRONIZE_CACHE: 3553 /* fall through */ 3554 3555 /* no-op's, complete with success */ 3556 case REZERO_UNIT: 3557 case SEEK_6: 3558 case SEEK_10: 3559 case TEST_UNIT_READY: 3560 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3561 break; 3562 3563 case SEND_DIAGNOSTIC: 3564 tmp8 = scsicmd[1] & ~(1 << 3); 3565 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3566 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3567 else 3568 ata_scsi_invalid_field(cmd); 3569 break; 3570 3571 /* all other commands */ 3572 default: 3573 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3574 /* "Invalid command operation code" */ 3575 cmd->scsi_done(cmd); 3576 break; 3577 } 3578 } 3579 3580 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3581 { 3582 int i, rc; 3583 3584 for (i = 0; i < host->n_ports; i++) { 3585 struct ata_port *ap = host->ports[i]; 3586 struct Scsi_Host *shost; 3587 3588 rc = -ENOMEM; 3589 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3590 if (!shost) 3591 goto err_alloc; 3592 3593 shost->eh_noresume = 1; 3594 *(struct ata_port **)&shost->hostdata[0] = ap; 3595 ap->scsi_host = shost; 3596 3597 shost->transportt = ata_scsi_transport_template; 3598 shost->unique_id = ap->print_id; 3599 shost->max_id = 16; 3600 shost->max_lun = 1; 3601 shost->max_channel = 1; 3602 shost->max_cmd_len = 16; 3603 3604 /* Schedule policy is determined by ->qc_defer() 3605 * callback and it needs to see every deferred qc. 3606 * Set host_blocked to 1 to prevent SCSI midlayer from 3607 * automatically deferring requests. 3608 */ 3609 shost->max_host_blocked = 1; 3610 3611 rc = scsi_add_host_with_dma(ap->scsi_host, 3612 &ap->tdev, ap->host->dev); 3613 if (rc) 3614 goto err_add; 3615 } 3616 3617 return 0; 3618 3619 err_add: 3620 scsi_host_put(host->ports[i]->scsi_host); 3621 err_alloc: 3622 while (--i >= 0) { 3623 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3624 3625 scsi_remove_host(shost); 3626 scsi_host_put(shost); 3627 } 3628 return rc; 3629 } 3630 3631 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3632 { 3633 int tries = 5; 3634 struct ata_device *last_failed_dev = NULL; 3635 struct ata_link *link; 3636 struct ata_device *dev; 3637 3638 repeat: 3639 ata_for_each_link(link, ap, EDGE) { 3640 ata_for_each_dev(dev, link, ENABLED) { 3641 struct scsi_device *sdev; 3642 int channel = 0, id = 0; 3643 3644 if (dev->sdev) 3645 continue; 3646 3647 if (ata_is_host_link(link)) 3648 id = dev->devno; 3649 else 3650 channel = link->pmp; 3651 3652 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3653 NULL); 3654 if (!IS_ERR(sdev)) { 3655 dev->sdev = sdev; 3656 scsi_device_put(sdev); 3657 ata_acpi_bind(dev); 3658 } else { 3659 dev->sdev = NULL; 3660 } 3661 } 3662 } 3663 3664 /* If we scanned while EH was in progress or allocation 3665 * failure occurred, scan would have failed silently. Check 3666 * whether all devices are attached. 3667 */ 3668 ata_for_each_link(link, ap, EDGE) { 3669 ata_for_each_dev(dev, link, ENABLED) { 3670 if (!dev->sdev) 3671 goto exit_loop; 3672 } 3673 } 3674 exit_loop: 3675 if (!link) 3676 return; 3677 3678 /* we're missing some SCSI devices */ 3679 if (sync) { 3680 /* If caller requested synchrnous scan && we've made 3681 * any progress, sleep briefly and repeat. 3682 */ 3683 if (dev != last_failed_dev) { 3684 msleep(100); 3685 last_failed_dev = dev; 3686 goto repeat; 3687 } 3688 3689 /* We might be failing to detect boot device, give it 3690 * a few more chances. 3691 */ 3692 if (--tries) { 3693 msleep(100); 3694 goto repeat; 3695 } 3696 3697 ata_port_err(ap, 3698 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3699 } 3700 3701 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3702 round_jiffies_relative(HZ)); 3703 } 3704 3705 /** 3706 * ata_scsi_offline_dev - offline attached SCSI device 3707 * @dev: ATA device to offline attached SCSI device for 3708 * 3709 * This function is called from ata_eh_hotplug() and responsible 3710 * for taking the SCSI device attached to @dev offline. This 3711 * function is called with host lock which protects dev->sdev 3712 * against clearing. 3713 * 3714 * LOCKING: 3715 * spin_lock_irqsave(host lock) 3716 * 3717 * RETURNS: 3718 * 1 if attached SCSI device exists, 0 otherwise. 3719 */ 3720 int ata_scsi_offline_dev(struct ata_device *dev) 3721 { 3722 if (dev->sdev) { 3723 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3724 return 1; 3725 } 3726 return 0; 3727 } 3728 3729 /** 3730 * ata_scsi_remove_dev - remove attached SCSI device 3731 * @dev: ATA device to remove attached SCSI device for 3732 * 3733 * This function is called from ata_eh_scsi_hotplug() and 3734 * responsible for removing the SCSI device attached to @dev. 3735 * 3736 * LOCKING: 3737 * Kernel thread context (may sleep). 3738 */ 3739 static void ata_scsi_remove_dev(struct ata_device *dev) 3740 { 3741 struct ata_port *ap = dev->link->ap; 3742 struct scsi_device *sdev; 3743 unsigned long flags; 3744 3745 /* Alas, we need to grab scan_mutex to ensure SCSI device 3746 * state doesn't change underneath us and thus 3747 * scsi_device_get() always succeeds. The mutex locking can 3748 * be removed if there is __scsi_device_get() interface which 3749 * increments reference counts regardless of device state. 3750 */ 3751 mutex_lock(&ap->scsi_host->scan_mutex); 3752 spin_lock_irqsave(ap->lock, flags); 3753 3754 ata_acpi_unbind(dev); 3755 3756 /* clearing dev->sdev is protected by host lock */ 3757 sdev = dev->sdev; 3758 dev->sdev = NULL; 3759 3760 if (sdev) { 3761 /* If user initiated unplug races with us, sdev can go 3762 * away underneath us after the host lock and 3763 * scan_mutex are released. Hold onto it. 3764 */ 3765 if (scsi_device_get(sdev) == 0) { 3766 /* The following ensures the attached sdev is 3767 * offline on return from ata_scsi_offline_dev() 3768 * regardless it wins or loses the race 3769 * against this function. 3770 */ 3771 scsi_device_set_state(sdev, SDEV_OFFLINE); 3772 } else { 3773 WARN_ON(1); 3774 sdev = NULL; 3775 } 3776 } 3777 3778 spin_unlock_irqrestore(ap->lock, flags); 3779 mutex_unlock(&ap->scsi_host->scan_mutex); 3780 3781 if (sdev) { 3782 ata_dev_info(dev, "detaching (SCSI %s)\n", 3783 dev_name(&sdev->sdev_gendev)); 3784 3785 scsi_remove_device(sdev); 3786 scsi_device_put(sdev); 3787 } 3788 } 3789 3790 static void ata_scsi_handle_link_detach(struct ata_link *link) 3791 { 3792 struct ata_port *ap = link->ap; 3793 struct ata_device *dev; 3794 3795 ata_for_each_dev(dev, link, ALL) { 3796 unsigned long flags; 3797 3798 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3799 continue; 3800 3801 spin_lock_irqsave(ap->lock, flags); 3802 dev->flags &= ~ATA_DFLAG_DETACHED; 3803 spin_unlock_irqrestore(ap->lock, flags); 3804 3805 ata_scsi_remove_dev(dev); 3806 } 3807 } 3808 3809 /** 3810 * ata_scsi_media_change_notify - send media change event 3811 * @dev: Pointer to the disk device with media change event 3812 * 3813 * Tell the block layer to send a media change notification 3814 * event. 3815 * 3816 * LOCKING: 3817 * spin_lock_irqsave(host lock) 3818 */ 3819 void ata_scsi_media_change_notify(struct ata_device *dev) 3820 { 3821 if (dev->sdev) 3822 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3823 GFP_ATOMIC); 3824 } 3825 3826 /** 3827 * ata_scsi_hotplug - SCSI part of hotplug 3828 * @work: Pointer to ATA port to perform SCSI hotplug on 3829 * 3830 * Perform SCSI part of hotplug. It's executed from a separate 3831 * workqueue after EH completes. This is necessary because SCSI 3832 * hot plugging requires working EH and hot unplugging is 3833 * synchronized with hot plugging with a mutex. 3834 * 3835 * LOCKING: 3836 * Kernel thread context (may sleep). 3837 */ 3838 void ata_scsi_hotplug(struct work_struct *work) 3839 { 3840 struct ata_port *ap = 3841 container_of(work, struct ata_port, hotplug_task.work); 3842 int i; 3843 3844 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3845 DPRINTK("ENTER/EXIT - unloading\n"); 3846 return; 3847 } 3848 3849 DPRINTK("ENTER\n"); 3850 mutex_lock(&ap->scsi_scan_mutex); 3851 3852 /* Unplug detached devices. We cannot use link iterator here 3853 * because PMP links have to be scanned even if PMP is 3854 * currently not attached. Iterate manually. 3855 */ 3856 ata_scsi_handle_link_detach(&ap->link); 3857 if (ap->pmp_link) 3858 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3859 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3860 3861 /* scan for new ones */ 3862 ata_scsi_scan_host(ap, 0); 3863 3864 mutex_unlock(&ap->scsi_scan_mutex); 3865 DPRINTK("EXIT\n"); 3866 } 3867 3868 /** 3869 * ata_scsi_user_scan - indication for user-initiated bus scan 3870 * @shost: SCSI host to scan 3871 * @channel: Channel to scan 3872 * @id: ID to scan 3873 * @lun: LUN to scan 3874 * 3875 * This function is called when user explicitly requests bus 3876 * scan. Set probe pending flag and invoke EH. 3877 * 3878 * LOCKING: 3879 * SCSI layer (we don't care) 3880 * 3881 * RETURNS: 3882 * Zero. 3883 */ 3884 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3885 unsigned int id, unsigned int lun) 3886 { 3887 struct ata_port *ap = ata_shost_to_port(shost); 3888 unsigned long flags; 3889 int devno, rc = 0; 3890 3891 if (!ap->ops->error_handler) 3892 return -EOPNOTSUPP; 3893 3894 if (lun != SCAN_WILD_CARD && lun) 3895 return -EINVAL; 3896 3897 if (!sata_pmp_attached(ap)) { 3898 if (channel != SCAN_WILD_CARD && channel) 3899 return -EINVAL; 3900 devno = id; 3901 } else { 3902 if (id != SCAN_WILD_CARD && id) 3903 return -EINVAL; 3904 devno = channel; 3905 } 3906 3907 spin_lock_irqsave(ap->lock, flags); 3908 3909 if (devno == SCAN_WILD_CARD) { 3910 struct ata_link *link; 3911 3912 ata_for_each_link(link, ap, EDGE) { 3913 struct ata_eh_info *ehi = &link->eh_info; 3914 ehi->probe_mask |= ATA_ALL_DEVICES; 3915 ehi->action |= ATA_EH_RESET; 3916 } 3917 } else { 3918 struct ata_device *dev = ata_find_dev(ap, devno); 3919 3920 if (dev) { 3921 struct ata_eh_info *ehi = &dev->link->eh_info; 3922 ehi->probe_mask |= 1 << dev->devno; 3923 ehi->action |= ATA_EH_RESET; 3924 } else 3925 rc = -EINVAL; 3926 } 3927 3928 if (rc == 0) { 3929 ata_port_schedule_eh(ap); 3930 spin_unlock_irqrestore(ap->lock, flags); 3931 ata_port_wait_eh(ap); 3932 } else 3933 spin_unlock_irqrestore(ap->lock, flags); 3934 3935 return rc; 3936 } 3937 3938 /** 3939 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3940 * @work: Pointer to ATA port to perform scsi_rescan_device() 3941 * 3942 * After ATA pass thru (SAT) commands are executed successfully, 3943 * libata need to propagate the changes to SCSI layer. 3944 * 3945 * LOCKING: 3946 * Kernel thread context (may sleep). 3947 */ 3948 void ata_scsi_dev_rescan(struct work_struct *work) 3949 { 3950 struct ata_port *ap = 3951 container_of(work, struct ata_port, scsi_rescan_task); 3952 struct ata_link *link; 3953 struct ata_device *dev; 3954 unsigned long flags; 3955 3956 mutex_lock(&ap->scsi_scan_mutex); 3957 spin_lock_irqsave(ap->lock, flags); 3958 3959 ata_for_each_link(link, ap, EDGE) { 3960 ata_for_each_dev(dev, link, ENABLED) { 3961 struct scsi_device *sdev = dev->sdev; 3962 3963 if (!sdev) 3964 continue; 3965 if (scsi_device_get(sdev)) 3966 continue; 3967 3968 spin_unlock_irqrestore(ap->lock, flags); 3969 scsi_rescan_device(&(sdev->sdev_gendev)); 3970 scsi_device_put(sdev); 3971 spin_lock_irqsave(ap->lock, flags); 3972 } 3973 } 3974 3975 spin_unlock_irqrestore(ap->lock, flags); 3976 mutex_unlock(&ap->scsi_scan_mutex); 3977 } 3978 3979 /** 3980 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3981 * @host: ATA host container for all SAS ports 3982 * @port_info: Information from low-level host driver 3983 * @shost: SCSI host that the scsi device is attached to 3984 * 3985 * LOCKING: 3986 * PCI/etc. bus probe sem. 3987 * 3988 * RETURNS: 3989 * ata_port pointer on success / NULL on failure. 3990 */ 3991 3992 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3993 struct ata_port_info *port_info, 3994 struct Scsi_Host *shost) 3995 { 3996 struct ata_port *ap; 3997 3998 ap = ata_port_alloc(host); 3999 if (!ap) 4000 return NULL; 4001 4002 ap->port_no = 0; 4003 ap->lock = &host->lock; 4004 ap->pio_mask = port_info->pio_mask; 4005 ap->mwdma_mask = port_info->mwdma_mask; 4006 ap->udma_mask = port_info->udma_mask; 4007 ap->flags |= port_info->flags; 4008 ap->ops = port_info->port_ops; 4009 ap->cbl = ATA_CBL_SATA; 4010 4011 return ap; 4012 } 4013 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4014 4015 /** 4016 * ata_sas_port_start - Set port up for dma. 4017 * @ap: Port to initialize 4018 * 4019 * Called just after data structures for each port are 4020 * initialized. 4021 * 4022 * May be used as the port_start() entry in ata_port_operations. 4023 * 4024 * LOCKING: 4025 * Inherited from caller. 4026 */ 4027 int ata_sas_port_start(struct ata_port *ap) 4028 { 4029 /* 4030 * the port is marked as frozen at allocation time, but if we don't 4031 * have new eh, we won't thaw it 4032 */ 4033 if (!ap->ops->error_handler) 4034 ap->pflags &= ~ATA_PFLAG_FROZEN; 4035 return 0; 4036 } 4037 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4038 4039 /** 4040 * ata_port_stop - Undo ata_sas_port_start() 4041 * @ap: Port to shut down 4042 * 4043 * May be used as the port_stop() entry in ata_port_operations. 4044 * 4045 * LOCKING: 4046 * Inherited from caller. 4047 */ 4048 4049 void ata_sas_port_stop(struct ata_port *ap) 4050 { 4051 } 4052 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4053 4054 /** 4055 * ata_sas_async_probe - simply schedule probing and return 4056 * @ap: Port to probe 4057 * 4058 * For batch scheduling of probe for sas attached ata devices, assumes 4059 * the port has already been through ata_sas_port_init() 4060 */ 4061 void ata_sas_async_probe(struct ata_port *ap) 4062 { 4063 __ata_port_probe(ap); 4064 } 4065 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4066 4067 int ata_sas_sync_probe(struct ata_port *ap) 4068 { 4069 return ata_port_probe(ap); 4070 } 4071 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4072 4073 4074 /** 4075 * ata_sas_port_init - Initialize a SATA device 4076 * @ap: SATA port to initialize 4077 * 4078 * LOCKING: 4079 * PCI/etc. bus probe sem. 4080 * 4081 * RETURNS: 4082 * Zero on success, non-zero on error. 4083 */ 4084 4085 int ata_sas_port_init(struct ata_port *ap) 4086 { 4087 int rc = ap->ops->port_start(ap); 4088 4089 if (rc) 4090 return rc; 4091 ap->print_id = atomic_inc_return(&ata_print_id); 4092 return 0; 4093 } 4094 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4095 4096 /** 4097 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4098 * @ap: SATA port to destroy 4099 * 4100 */ 4101 4102 void ata_sas_port_destroy(struct ata_port *ap) 4103 { 4104 if (ap->ops->port_stop) 4105 ap->ops->port_stop(ap); 4106 kfree(ap); 4107 } 4108 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4109 4110 /** 4111 * ata_sas_slave_configure - Default slave_config routine for libata devices 4112 * @sdev: SCSI device to configure 4113 * @ap: ATA port to which SCSI device is attached 4114 * 4115 * RETURNS: 4116 * Zero. 4117 */ 4118 4119 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4120 { 4121 ata_scsi_sdev_config(sdev); 4122 ata_scsi_dev_config(sdev, ap->link.device); 4123 return 0; 4124 } 4125 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4126 4127 /** 4128 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4129 * @cmd: SCSI command to be sent 4130 * @ap: ATA port to which the command is being sent 4131 * 4132 * RETURNS: 4133 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4134 * 0 otherwise. 4135 */ 4136 4137 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4138 { 4139 int rc = 0; 4140 4141 ata_scsi_dump_cdb(ap, cmd); 4142 4143 if (likely(ata_dev_enabled(ap->link.device))) 4144 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4145 else { 4146 cmd->result = (DID_BAD_TARGET << 16); 4147 cmd->scsi_done(cmd); 4148 } 4149 return rc; 4150 } 4151 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4152