1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Tejun Heo <tj@kernel.org> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <linux/export.h> 41 #include <scsi/scsi.h> 42 #include <scsi/scsi_host.h> 43 #include <scsi/scsi_cmnd.h> 44 #include <scsi/scsi_eh.h> 45 #include <scsi/scsi_device.h> 46 #include <scsi/scsi_tcq.h> 47 #include <scsi/scsi_transport.h> 48 #include <linux/libata.h> 49 #include <linux/hdreg.h> 50 #include <linux/uaccess.h> 51 #include <linux/suspend.h> 52 #include <linux/pm_qos.h> 53 #include <asm/unaligned.h> 54 55 #include "libata.h" 56 #include "libata-transport.h" 57 58 #define ATA_SCSI_RBUF_SIZE 4096 59 60 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 61 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 62 63 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 64 65 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 66 const struct scsi_device *scsidev); 67 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 68 const struct scsi_device *scsidev); 69 70 #define RW_RECOVERY_MPAGE 0x1 71 #define RW_RECOVERY_MPAGE_LEN 12 72 #define CACHE_MPAGE 0x8 73 #define CACHE_MPAGE_LEN 20 74 #define CONTROL_MPAGE 0xa 75 #define CONTROL_MPAGE_LEN 12 76 #define ALL_MPAGES 0x3f 77 #define ALL_SUB_MPAGES 0xff 78 79 80 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 81 RW_RECOVERY_MPAGE, 82 RW_RECOVERY_MPAGE_LEN - 2, 83 (1 << 7), /* AWRE */ 84 0, /* read retry count */ 85 0, 0, 0, 0, 86 0, /* write retry count */ 87 0, 0, 0 88 }; 89 90 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 91 CACHE_MPAGE, 92 CACHE_MPAGE_LEN - 2, 93 0, /* contains WCE, needs to be 0 for logic */ 94 0, 0, 0, 0, 0, 0, 0, 0, 0, 95 0, /* contains DRA, needs to be 0 for logic */ 96 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 100 CONTROL_MPAGE, 101 CONTROL_MPAGE_LEN - 2, 102 2, /* DSENSE=0, GLTSD=1 */ 103 0, /* [QAM+QERR may be 1, see 05-359r1] */ 104 0, 0, 0, 0, 0xff, 0xff, 105 0, 30 /* extended self test time, see 05-359r1 */ 106 }; 107 108 static const char *ata_lpm_policy_names[] = { 109 [ATA_LPM_UNKNOWN] = "max_performance", 110 [ATA_LPM_MAX_POWER] = "max_performance", 111 [ATA_LPM_MED_POWER] = "medium_power", 112 [ATA_LPM_MIN_POWER] = "min_power", 113 }; 114 115 static ssize_t ata_scsi_lpm_store(struct device *dev, 116 struct device_attribute *attr, 117 const char *buf, size_t count) 118 { 119 struct Scsi_Host *shost = class_to_shost(dev); 120 struct ata_port *ap = ata_shost_to_port(shost); 121 enum ata_lpm_policy policy; 122 unsigned long flags; 123 124 /* UNKNOWN is internal state, iterate from MAX_POWER */ 125 for (policy = ATA_LPM_MAX_POWER; 126 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 127 const char *name = ata_lpm_policy_names[policy]; 128 129 if (strncmp(name, buf, strlen(name)) == 0) 130 break; 131 } 132 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 133 return -EINVAL; 134 135 spin_lock_irqsave(ap->lock, flags); 136 ap->target_lpm_policy = policy; 137 ata_port_schedule_eh(ap); 138 spin_unlock_irqrestore(ap->lock, flags); 139 140 return count; 141 } 142 143 static ssize_t ata_scsi_lpm_show(struct device *dev, 144 struct device_attribute *attr, char *buf) 145 { 146 struct Scsi_Host *shost = class_to_shost(dev); 147 struct ata_port *ap = ata_shost_to_port(shost); 148 149 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 150 return -EINVAL; 151 152 return snprintf(buf, PAGE_SIZE, "%s\n", 153 ata_lpm_policy_names[ap->target_lpm_policy]); 154 } 155 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 156 ata_scsi_lpm_show, ata_scsi_lpm_store); 157 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 158 159 static ssize_t ata_scsi_park_show(struct device *device, 160 struct device_attribute *attr, char *buf) 161 { 162 struct scsi_device *sdev = to_scsi_device(device); 163 struct ata_port *ap; 164 struct ata_link *link; 165 struct ata_device *dev; 166 unsigned long flags, now; 167 unsigned int uninitialized_var(msecs); 168 int rc = 0; 169 170 ap = ata_shost_to_port(sdev->host); 171 172 spin_lock_irqsave(ap->lock, flags); 173 dev = ata_scsi_find_dev(ap, sdev); 174 if (!dev) { 175 rc = -ENODEV; 176 goto unlock; 177 } 178 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 179 rc = -EOPNOTSUPP; 180 goto unlock; 181 } 182 183 link = dev->link; 184 now = jiffies; 185 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 186 link->eh_context.unloaded_mask & (1 << dev->devno) && 187 time_after(dev->unpark_deadline, now)) 188 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 189 else 190 msecs = 0; 191 192 unlock: 193 spin_unlock_irq(ap->lock); 194 195 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 196 } 197 198 static ssize_t ata_scsi_park_store(struct device *device, 199 struct device_attribute *attr, 200 const char *buf, size_t len) 201 { 202 struct scsi_device *sdev = to_scsi_device(device); 203 struct ata_port *ap; 204 struct ata_device *dev; 205 long int input; 206 unsigned long flags; 207 int rc; 208 209 rc = kstrtol(buf, 10, &input); 210 if (rc) 211 return rc; 212 if (input < -2) 213 return -EINVAL; 214 if (input > ATA_TMOUT_MAX_PARK) { 215 rc = -EOVERFLOW; 216 input = ATA_TMOUT_MAX_PARK; 217 } 218 219 ap = ata_shost_to_port(sdev->host); 220 221 spin_lock_irqsave(ap->lock, flags); 222 dev = ata_scsi_find_dev(ap, sdev); 223 if (unlikely(!dev)) { 224 rc = -ENODEV; 225 goto unlock; 226 } 227 if (dev->class != ATA_DEV_ATA) { 228 rc = -EOPNOTSUPP; 229 goto unlock; 230 } 231 232 if (input >= 0) { 233 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 234 rc = -EOPNOTSUPP; 235 goto unlock; 236 } 237 238 dev->unpark_deadline = ata_deadline(jiffies, input); 239 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 240 ata_port_schedule_eh(ap); 241 complete(&ap->park_req_pending); 242 } else { 243 switch (input) { 244 case -1: 245 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 246 break; 247 case -2: 248 dev->flags |= ATA_DFLAG_NO_UNLOAD; 249 break; 250 } 251 } 252 unlock: 253 spin_unlock_irqrestore(ap->lock, flags); 254 255 return rc ? rc : len; 256 } 257 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 258 ata_scsi_park_show, ata_scsi_park_store); 259 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 260 261 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 262 { 263 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 264 265 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 266 } 267 268 static ssize_t 269 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 270 const char *buf, size_t count) 271 { 272 struct Scsi_Host *shost = class_to_shost(dev); 273 struct ata_port *ap = ata_shost_to_port(shost); 274 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 275 return ap->ops->em_store(ap, buf, count); 276 return -EINVAL; 277 } 278 279 static ssize_t 280 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 281 char *buf) 282 { 283 struct Scsi_Host *shost = class_to_shost(dev); 284 struct ata_port *ap = ata_shost_to_port(shost); 285 286 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 287 return ap->ops->em_show(ap, buf); 288 return -EINVAL; 289 } 290 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 291 ata_scsi_em_message_show, ata_scsi_em_message_store); 292 EXPORT_SYMBOL_GPL(dev_attr_em_message); 293 294 static ssize_t 295 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 296 char *buf) 297 { 298 struct Scsi_Host *shost = class_to_shost(dev); 299 struct ata_port *ap = ata_shost_to_port(shost); 300 301 return snprintf(buf, 23, "%d\n", ap->em_message_type); 302 } 303 DEVICE_ATTR(em_message_type, S_IRUGO, 304 ata_scsi_em_message_type_show, NULL); 305 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 306 307 static ssize_t 308 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 309 char *buf) 310 { 311 struct scsi_device *sdev = to_scsi_device(dev); 312 struct ata_port *ap = ata_shost_to_port(sdev->host); 313 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 314 315 if (atadev && ap->ops->sw_activity_show && 316 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 317 return ap->ops->sw_activity_show(atadev, buf); 318 return -EINVAL; 319 } 320 321 static ssize_t 322 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 323 const char *buf, size_t count) 324 { 325 struct scsi_device *sdev = to_scsi_device(dev); 326 struct ata_port *ap = ata_shost_to_port(sdev->host); 327 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 328 enum sw_activity val; 329 int rc; 330 331 if (atadev && ap->ops->sw_activity_store && 332 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 333 val = simple_strtoul(buf, NULL, 0); 334 switch (val) { 335 case OFF: case BLINK_ON: case BLINK_OFF: 336 rc = ap->ops->sw_activity_store(atadev, val); 337 if (!rc) 338 return count; 339 else 340 return rc; 341 } 342 } 343 return -EINVAL; 344 } 345 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 346 ata_scsi_activity_store); 347 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 348 349 struct device_attribute *ata_common_sdev_attrs[] = { 350 &dev_attr_unload_heads, 351 NULL 352 }; 353 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 354 355 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 356 { 357 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 358 /* "Invalid field in cbd" */ 359 cmd->scsi_done(cmd); 360 } 361 362 /** 363 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 364 * @sdev: SCSI device for which BIOS geometry is to be determined 365 * @bdev: block device associated with @sdev 366 * @capacity: capacity of SCSI device 367 * @geom: location to which geometry will be output 368 * 369 * Generic bios head/sector/cylinder calculator 370 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 371 * mapping. Some situations may arise where the disk is not 372 * bootable if this is not used. 373 * 374 * LOCKING: 375 * Defined by the SCSI layer. We don't really care. 376 * 377 * RETURNS: 378 * Zero. 379 */ 380 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 381 sector_t capacity, int geom[]) 382 { 383 geom[0] = 255; 384 geom[1] = 63; 385 sector_div(capacity, 255*63); 386 geom[2] = capacity; 387 388 return 0; 389 } 390 391 /** 392 * ata_scsi_unlock_native_capacity - unlock native capacity 393 * @sdev: SCSI device to adjust device capacity for 394 * 395 * This function is called if a partition on @sdev extends beyond 396 * the end of the device. It requests EH to unlock HPA. 397 * 398 * LOCKING: 399 * Defined by the SCSI layer. Might sleep. 400 */ 401 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 402 { 403 struct ata_port *ap = ata_shost_to_port(sdev->host); 404 struct ata_device *dev; 405 unsigned long flags; 406 407 spin_lock_irqsave(ap->lock, flags); 408 409 dev = ata_scsi_find_dev(ap, sdev); 410 if (dev && dev->n_sectors < dev->n_native_sectors) { 411 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 412 dev->link->eh_info.action |= ATA_EH_RESET; 413 ata_port_schedule_eh(ap); 414 } 415 416 spin_unlock_irqrestore(ap->lock, flags); 417 ata_port_wait_eh(ap); 418 } 419 420 /** 421 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 422 * @ap: target port 423 * @sdev: SCSI device to get identify data for 424 * @arg: User buffer area for identify data 425 * 426 * LOCKING: 427 * Defined by the SCSI layer. We don't really care. 428 * 429 * RETURNS: 430 * Zero on success, negative errno on error. 431 */ 432 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 433 void __user *arg) 434 { 435 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 436 u16 __user *dst = arg; 437 char buf[40]; 438 439 if (!dev) 440 return -ENOMSG; 441 442 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 443 return -EFAULT; 444 445 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 446 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 447 return -EFAULT; 448 449 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 450 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 451 return -EFAULT; 452 453 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 454 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 455 return -EFAULT; 456 457 return 0; 458 } 459 460 /** 461 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 462 * @scsidev: Device to which we are issuing command 463 * @arg: User provided data for issuing command 464 * 465 * LOCKING: 466 * Defined by the SCSI layer. We don't really care. 467 * 468 * RETURNS: 469 * Zero on success, negative errno on error. 470 */ 471 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 472 { 473 int rc = 0; 474 u8 scsi_cmd[MAX_COMMAND_SIZE]; 475 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 476 int argsize = 0; 477 enum dma_data_direction data_dir; 478 int cmd_result; 479 480 if (arg == NULL) 481 return -EINVAL; 482 483 if (copy_from_user(args, arg, sizeof(args))) 484 return -EFAULT; 485 486 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 487 if (!sensebuf) 488 return -ENOMEM; 489 490 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 491 492 if (args[3]) { 493 argsize = ATA_SECT_SIZE * args[3]; 494 argbuf = kmalloc(argsize, GFP_KERNEL); 495 if (argbuf == NULL) { 496 rc = -ENOMEM; 497 goto error; 498 } 499 500 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 501 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 502 block count in sector count field */ 503 data_dir = DMA_FROM_DEVICE; 504 } else { 505 scsi_cmd[1] = (3 << 1); /* Non-data */ 506 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 507 data_dir = DMA_NONE; 508 } 509 510 scsi_cmd[0] = ATA_16; 511 512 scsi_cmd[4] = args[2]; 513 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 514 scsi_cmd[6] = args[3]; 515 scsi_cmd[8] = args[1]; 516 scsi_cmd[10] = 0x4f; 517 scsi_cmd[12] = 0xc2; 518 } else { 519 scsi_cmd[6] = args[1]; 520 } 521 scsi_cmd[14] = args[0]; 522 523 /* Good values for timeout and retries? Values below 524 from scsi_ioctl_send_command() for default case... */ 525 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 526 sensebuf, (10*HZ), 5, 0, NULL); 527 528 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 529 u8 *desc = sensebuf + 8; 530 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 531 532 /* If we set cc then ATA pass-through will cause a 533 * check condition even if no error. Filter that. */ 534 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 535 struct scsi_sense_hdr sshdr; 536 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 537 &sshdr); 538 if (sshdr.sense_key == RECOVERED_ERROR && 539 sshdr.asc == 0 && sshdr.ascq == 0x1d) 540 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 541 } 542 543 /* Send userspace a few ATA registers (same as drivers/ide) */ 544 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 545 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 546 args[0] = desc[13]; /* status */ 547 args[1] = desc[3]; /* error */ 548 args[2] = desc[5]; /* sector count (0:7) */ 549 if (copy_to_user(arg, args, sizeof(args))) 550 rc = -EFAULT; 551 } 552 } 553 554 555 if (cmd_result) { 556 rc = -EIO; 557 goto error; 558 } 559 560 if ((argbuf) 561 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 562 rc = -EFAULT; 563 error: 564 kfree(sensebuf); 565 kfree(argbuf); 566 return rc; 567 } 568 569 /** 570 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 571 * @scsidev: Device to which we are issuing command 572 * @arg: User provided data for issuing command 573 * 574 * LOCKING: 575 * Defined by the SCSI layer. We don't really care. 576 * 577 * RETURNS: 578 * Zero on success, negative errno on error. 579 */ 580 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 581 { 582 int rc = 0; 583 u8 scsi_cmd[MAX_COMMAND_SIZE]; 584 u8 args[7], *sensebuf = NULL; 585 int cmd_result; 586 587 if (arg == NULL) 588 return -EINVAL; 589 590 if (copy_from_user(args, arg, sizeof(args))) 591 return -EFAULT; 592 593 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 594 if (!sensebuf) 595 return -ENOMEM; 596 597 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 598 scsi_cmd[0] = ATA_16; 599 scsi_cmd[1] = (3 << 1); /* Non-data */ 600 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 601 scsi_cmd[4] = args[1]; 602 scsi_cmd[6] = args[2]; 603 scsi_cmd[8] = args[3]; 604 scsi_cmd[10] = args[4]; 605 scsi_cmd[12] = args[5]; 606 scsi_cmd[13] = args[6] & 0x4f; 607 scsi_cmd[14] = args[0]; 608 609 /* Good values for timeout and retries? Values below 610 from scsi_ioctl_send_command() for default case... */ 611 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 612 sensebuf, (10*HZ), 5, 0, NULL); 613 614 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 615 u8 *desc = sensebuf + 8; 616 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 617 618 /* If we set cc then ATA pass-through will cause a 619 * check condition even if no error. Filter that. */ 620 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 621 struct scsi_sense_hdr sshdr; 622 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 623 &sshdr); 624 if (sshdr.sense_key == RECOVERED_ERROR && 625 sshdr.asc == 0 && sshdr.ascq == 0x1d) 626 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 627 } 628 629 /* Send userspace ATA registers */ 630 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 631 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 632 args[0] = desc[13]; /* status */ 633 args[1] = desc[3]; /* error */ 634 args[2] = desc[5]; /* sector count (0:7) */ 635 args[3] = desc[7]; /* lbal */ 636 args[4] = desc[9]; /* lbam */ 637 args[5] = desc[11]; /* lbah */ 638 args[6] = desc[12]; /* select */ 639 if (copy_to_user(arg, args, sizeof(args))) 640 rc = -EFAULT; 641 } 642 } 643 644 if (cmd_result) { 645 rc = -EIO; 646 goto error; 647 } 648 649 error: 650 kfree(sensebuf); 651 return rc; 652 } 653 654 static int ata_ioc32(struct ata_port *ap) 655 { 656 if (ap->flags & ATA_FLAG_PIO_DMA) 657 return 1; 658 if (ap->pflags & ATA_PFLAG_PIO32) 659 return 1; 660 return 0; 661 } 662 663 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 664 int cmd, void __user *arg) 665 { 666 int val = -EINVAL, rc = -EINVAL; 667 unsigned long flags; 668 669 switch (cmd) { 670 case ATA_IOC_GET_IO32: 671 spin_lock_irqsave(ap->lock, flags); 672 val = ata_ioc32(ap); 673 spin_unlock_irqrestore(ap->lock, flags); 674 if (copy_to_user(arg, &val, 1)) 675 return -EFAULT; 676 return 0; 677 678 case ATA_IOC_SET_IO32: 679 val = (unsigned long) arg; 680 rc = 0; 681 spin_lock_irqsave(ap->lock, flags); 682 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 683 if (val) 684 ap->pflags |= ATA_PFLAG_PIO32; 685 else 686 ap->pflags &= ~ATA_PFLAG_PIO32; 687 } else { 688 if (val != ata_ioc32(ap)) 689 rc = -EINVAL; 690 } 691 spin_unlock_irqrestore(ap->lock, flags); 692 return rc; 693 694 case HDIO_GET_IDENTITY: 695 return ata_get_identity(ap, scsidev, arg); 696 697 case HDIO_DRIVE_CMD: 698 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 699 return -EACCES; 700 return ata_cmd_ioctl(scsidev, arg); 701 702 case HDIO_DRIVE_TASK: 703 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 704 return -EACCES; 705 return ata_task_ioctl(scsidev, arg); 706 707 default: 708 rc = -ENOTTY; 709 break; 710 } 711 712 return rc; 713 } 714 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 715 716 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 717 { 718 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 719 scsidev, cmd, arg); 720 } 721 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 722 723 /** 724 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 725 * @dev: ATA device to which the new command is attached 726 * @cmd: SCSI command that originated this ATA command 727 * 728 * Obtain a reference to an unused ata_queued_cmd structure, 729 * which is the basic libata structure representing a single 730 * ATA command sent to the hardware. 731 * 732 * If a command was available, fill in the SCSI-specific 733 * portions of the structure with information on the 734 * current command. 735 * 736 * LOCKING: 737 * spin_lock_irqsave(host lock) 738 * 739 * RETURNS: 740 * Command allocated, or %NULL if none available. 741 */ 742 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 743 struct scsi_cmnd *cmd) 744 { 745 struct ata_queued_cmd *qc; 746 747 qc = ata_qc_new_init(dev); 748 if (qc) { 749 qc->scsicmd = cmd; 750 qc->scsidone = cmd->scsi_done; 751 752 qc->sg = scsi_sglist(cmd); 753 qc->n_elem = scsi_sg_count(cmd); 754 } else { 755 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 756 cmd->scsi_done(cmd); 757 } 758 759 return qc; 760 } 761 762 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 763 { 764 struct scsi_cmnd *scmd = qc->scsicmd; 765 766 qc->extrabytes = scmd->request->extra_len; 767 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 768 } 769 770 /** 771 * ata_dump_status - user friendly display of error info 772 * @id: id of the port in question 773 * @tf: ptr to filled out taskfile 774 * 775 * Decode and dump the ATA error/status registers for the user so 776 * that they have some idea what really happened at the non 777 * make-believe layer. 778 * 779 * LOCKING: 780 * inherited from caller 781 */ 782 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 783 { 784 u8 stat = tf->command, err = tf->feature; 785 786 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 787 if (stat & ATA_BUSY) { 788 printk("Busy }\n"); /* Data is not valid in this case */ 789 } else { 790 if (stat & 0x40) printk("DriveReady "); 791 if (stat & 0x20) printk("DeviceFault "); 792 if (stat & 0x10) printk("SeekComplete "); 793 if (stat & 0x08) printk("DataRequest "); 794 if (stat & 0x04) printk("CorrectedError "); 795 if (stat & 0x02) printk("Index "); 796 if (stat & 0x01) printk("Error "); 797 printk("}\n"); 798 799 if (err) { 800 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 801 if (err & 0x04) printk("DriveStatusError "); 802 if (err & 0x80) { 803 if (err & 0x04) printk("BadCRC "); 804 else printk("Sector "); 805 } 806 if (err & 0x40) printk("UncorrectableError "); 807 if (err & 0x10) printk("SectorIdNotFound "); 808 if (err & 0x02) printk("TrackZeroNotFound "); 809 if (err & 0x01) printk("AddrMarkNotFound "); 810 printk("}\n"); 811 } 812 } 813 } 814 815 /** 816 * ata_to_sense_error - convert ATA error to SCSI error 817 * @id: ATA device number 818 * @drv_stat: value contained in ATA status register 819 * @drv_err: value contained in ATA error register 820 * @sk: the sense key we'll fill out 821 * @asc: the additional sense code we'll fill out 822 * @ascq: the additional sense code qualifier we'll fill out 823 * @verbose: be verbose 824 * 825 * Converts an ATA error into a SCSI error. Fill out pointers to 826 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 827 * format sense blocks. 828 * 829 * LOCKING: 830 * spin_lock_irqsave(host lock) 831 */ 832 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 833 u8 *asc, u8 *ascq, int verbose) 834 { 835 int i; 836 837 /* Based on the 3ware driver translation table */ 838 static const unsigned char sense_table[][4] = { 839 /* BBD|ECC|ID|MAR */ 840 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 841 /* BBD|ECC|ID */ 842 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 843 /* ECC|MC|MARK */ 844 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 845 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 846 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 847 /* MC|ID|ABRT|TRK0|MARK */ 848 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 849 /* MCR|MARK */ 850 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 851 /* Bad address mark */ 852 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 853 /* TRK0 */ 854 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 855 /* Abort: 0x04 is not translated here, see below */ 856 /* Media change request */ 857 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 858 /* SRV/IDNF */ 859 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, // ID not found Logical address out of range 860 /* MC */ 861 {0x20, UNIT_ATTENTION, 0x28, 0x00}, // Media Changed Not ready to ready change, medium may have changed 862 /* ECC */ 863 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 864 /* BBD - block marked bad */ 865 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 866 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 867 }; 868 static const unsigned char stat_table[][4] = { 869 /* Must be first because BUSY means no other bits valid */ 870 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 871 {0x20, HARDWARE_ERROR, 0x44, 0x00}, // Device fault, internal target failure 872 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 873 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 874 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 875 }; 876 877 /* 878 * Is this an error we can process/parse 879 */ 880 if (drv_stat & ATA_BUSY) { 881 drv_err = 0; /* Ignore the err bits, they're invalid */ 882 } 883 884 if (drv_err) { 885 /* Look for drv_err */ 886 for (i = 0; sense_table[i][0] != 0xFF; i++) { 887 /* Look for best matches first */ 888 if ((sense_table[i][0] & drv_err) == 889 sense_table[i][0]) { 890 *sk = sense_table[i][1]; 891 *asc = sense_table[i][2]; 892 *ascq = sense_table[i][3]; 893 goto translate_done; 894 } 895 } 896 } 897 898 /* 899 * Fall back to interpreting status bits. Note that if the drv_err 900 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 901 * is not descriptive enough. 902 */ 903 for (i = 0; stat_table[i][0] != 0xFF; i++) { 904 if (stat_table[i][0] & drv_stat) { 905 *sk = stat_table[i][1]; 906 *asc = stat_table[i][2]; 907 *ascq = stat_table[i][3]; 908 goto translate_done; 909 } 910 } 911 912 /* 913 * We need a sensible error return here, which is tricky, and one 914 * that won't cause people to do things like return a disk wrongly. 915 */ 916 *sk = ABORTED_COMMAND; 917 *asc = 0x00; 918 *ascq = 0x00; 919 920 translate_done: 921 if (verbose) 922 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 923 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 924 id, drv_stat, drv_err, *sk, *asc, *ascq); 925 return; 926 } 927 928 /* 929 * ata_gen_passthru_sense - Generate check condition sense block. 930 * @qc: Command that completed. 931 * 932 * This function is specific to the ATA descriptor format sense 933 * block specified for the ATA pass through commands. Regardless 934 * of whether the command errored or not, return a sense 935 * block. Copy all controller registers into the sense 936 * block. If there was no error, we get the request from an ATA 937 * passthrough command, so we use the following sense data: 938 * sk = RECOVERED ERROR 939 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 940 * 941 * 942 * LOCKING: 943 * None. 944 */ 945 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 946 { 947 struct scsi_cmnd *cmd = qc->scsicmd; 948 struct ata_taskfile *tf = &qc->result_tf; 949 unsigned char *sb = cmd->sense_buffer; 950 unsigned char *desc = sb + 8; 951 int verbose = qc->ap->ops->error_handler == NULL; 952 953 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 954 955 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 956 957 /* 958 * Use ata_to_sense_error() to map status register bits 959 * onto sense key, asc & ascq. 960 */ 961 if (qc->err_mask || 962 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 963 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 964 &sb[1], &sb[2], &sb[3], verbose); 965 sb[1] &= 0x0f; 966 } else { 967 sb[1] = RECOVERED_ERROR; 968 sb[2] = 0; 969 sb[3] = 0x1D; 970 } 971 972 /* 973 * Sense data is current and format is descriptor. 974 */ 975 sb[0] = 0x72; 976 977 desc[0] = 0x09; 978 979 /* set length of additional sense data */ 980 sb[7] = 14; 981 desc[1] = 12; 982 983 /* 984 * Copy registers into sense buffer. 985 */ 986 desc[2] = 0x00; 987 desc[3] = tf->feature; /* == error reg */ 988 desc[5] = tf->nsect; 989 desc[7] = tf->lbal; 990 desc[9] = tf->lbam; 991 desc[11] = tf->lbah; 992 desc[12] = tf->device; 993 desc[13] = tf->command; /* == status reg */ 994 995 /* 996 * Fill in Extend bit, and the high order bytes 997 * if applicable. 998 */ 999 if (tf->flags & ATA_TFLAG_LBA48) { 1000 desc[2] |= 0x01; 1001 desc[4] = tf->hob_nsect; 1002 desc[6] = tf->hob_lbal; 1003 desc[8] = tf->hob_lbam; 1004 desc[10] = tf->hob_lbah; 1005 } 1006 } 1007 1008 /** 1009 * ata_gen_ata_sense - generate a SCSI fixed sense block 1010 * @qc: Command that we are erroring out 1011 * 1012 * Generate sense block for a failed ATA command @qc. Descriptor 1013 * format is used to accommodate LBA48 block address. 1014 * 1015 * LOCKING: 1016 * None. 1017 */ 1018 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1019 { 1020 struct ata_device *dev = qc->dev; 1021 struct scsi_cmnd *cmd = qc->scsicmd; 1022 struct ata_taskfile *tf = &qc->result_tf; 1023 unsigned char *sb = cmd->sense_buffer; 1024 unsigned char *desc = sb + 8; 1025 int verbose = qc->ap->ops->error_handler == NULL; 1026 u64 block; 1027 1028 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1029 1030 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1031 1032 /* sense data is current and format is descriptor */ 1033 sb[0] = 0x72; 1034 1035 /* Use ata_to_sense_error() to map status register bits 1036 * onto sense key, asc & ascq. 1037 */ 1038 if (qc->err_mask || 1039 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1040 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1041 &sb[1], &sb[2], &sb[3], verbose); 1042 sb[1] &= 0x0f; 1043 } 1044 1045 block = ata_tf_read_block(&qc->result_tf, dev); 1046 1047 /* information sense data descriptor */ 1048 sb[7] = 12; 1049 desc[0] = 0x00; 1050 desc[1] = 10; 1051 1052 desc[2] |= 0x80; /* valid */ 1053 desc[6] = block >> 40; 1054 desc[7] = block >> 32; 1055 desc[8] = block >> 24; 1056 desc[9] = block >> 16; 1057 desc[10] = block >> 8; 1058 desc[11] = block; 1059 } 1060 1061 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1062 { 1063 sdev->use_10_for_rw = 1; 1064 sdev->use_10_for_ms = 1; 1065 sdev->no_report_opcodes = 1; 1066 sdev->no_write_same = 1; 1067 1068 /* Schedule policy is determined by ->qc_defer() callback and 1069 * it needs to see every deferred qc. Set dev_blocked to 1 to 1070 * prevent SCSI midlayer from automatically deferring 1071 * requests. 1072 */ 1073 sdev->max_device_blocked = 1; 1074 } 1075 1076 /** 1077 * atapi_drain_needed - Check whether data transfer may overflow 1078 * @rq: request to be checked 1079 * 1080 * ATAPI commands which transfer variable length data to host 1081 * might overflow due to application error or hardare bug. This 1082 * function checks whether overflow should be drained and ignored 1083 * for @request. 1084 * 1085 * LOCKING: 1086 * None. 1087 * 1088 * RETURNS: 1089 * 1 if ; otherwise, 0. 1090 */ 1091 static int atapi_drain_needed(struct request *rq) 1092 { 1093 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1094 return 0; 1095 1096 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1097 return 0; 1098 1099 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1100 } 1101 1102 static int ata_scsi_dev_config(struct scsi_device *sdev, 1103 struct ata_device *dev) 1104 { 1105 struct request_queue *q = sdev->request_queue; 1106 1107 if (!ata_id_has_unload(dev->id)) 1108 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1109 1110 /* configure max sectors */ 1111 blk_queue_max_hw_sectors(q, dev->max_sectors); 1112 1113 if (dev->class == ATA_DEV_ATAPI) { 1114 void *buf; 1115 1116 sdev->sector_size = ATA_SECT_SIZE; 1117 1118 /* set DMA padding */ 1119 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1120 1121 /* configure draining */ 1122 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1123 if (!buf) { 1124 ata_dev_err(dev, "drain buffer allocation failed\n"); 1125 return -ENOMEM; 1126 } 1127 1128 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1129 } else { 1130 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1131 sdev->manage_start_stop = 1; 1132 } 1133 1134 /* 1135 * ata_pio_sectors() expects buffer for each sector to not cross 1136 * page boundary. Enforce it by requiring buffers to be sector 1137 * aligned, which works iff sector_size is not larger than 1138 * PAGE_SIZE. ATAPI devices also need the alignment as 1139 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1140 */ 1141 if (sdev->sector_size > PAGE_SIZE) 1142 ata_dev_warn(dev, 1143 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1144 sdev->sector_size); 1145 1146 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1147 1148 if (dev->flags & ATA_DFLAG_AN) 1149 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1150 1151 if (dev->flags & ATA_DFLAG_NCQ) { 1152 int depth; 1153 1154 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1155 depth = min(ATA_MAX_QUEUE - 1, depth); 1156 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1157 } 1158 1159 blk_queue_flush_queueable(q, false); 1160 1161 dev->sdev = sdev; 1162 return 0; 1163 } 1164 1165 /** 1166 * ata_scsi_slave_config - Set SCSI device attributes 1167 * @sdev: SCSI device to examine 1168 * 1169 * This is called before we actually start reading 1170 * and writing to the device, to configure certain 1171 * SCSI mid-layer behaviors. 1172 * 1173 * LOCKING: 1174 * Defined by SCSI layer. We don't really care. 1175 */ 1176 1177 int ata_scsi_slave_config(struct scsi_device *sdev) 1178 { 1179 struct ata_port *ap = ata_shost_to_port(sdev->host); 1180 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1181 int rc = 0; 1182 1183 ata_scsi_sdev_config(sdev); 1184 1185 if (dev) 1186 rc = ata_scsi_dev_config(sdev, dev); 1187 1188 return rc; 1189 } 1190 1191 /** 1192 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1193 * @sdev: SCSI device to be destroyed 1194 * 1195 * @sdev is about to be destroyed for hot/warm unplugging. If 1196 * this unplugging was initiated by libata as indicated by NULL 1197 * dev->sdev, this function doesn't have to do anything. 1198 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1199 * Clear dev->sdev, schedule the device for ATA detach and invoke 1200 * EH. 1201 * 1202 * LOCKING: 1203 * Defined by SCSI layer. We don't really care. 1204 */ 1205 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1206 { 1207 struct ata_port *ap = ata_shost_to_port(sdev->host); 1208 struct request_queue *q = sdev->request_queue; 1209 unsigned long flags; 1210 struct ata_device *dev; 1211 1212 if (!ap->ops->error_handler) 1213 return; 1214 1215 spin_lock_irqsave(ap->lock, flags); 1216 dev = __ata_scsi_find_dev(ap, sdev); 1217 if (dev && dev->sdev) { 1218 /* SCSI device already in CANCEL state, no need to offline it */ 1219 dev->sdev = NULL; 1220 dev->flags |= ATA_DFLAG_DETACH; 1221 ata_port_schedule_eh(ap); 1222 } 1223 spin_unlock_irqrestore(ap->lock, flags); 1224 1225 kfree(q->dma_drain_buffer); 1226 q->dma_drain_buffer = NULL; 1227 q->dma_drain_size = 0; 1228 } 1229 1230 /** 1231 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1232 * @ap: ATA port to which the device change the queue depth 1233 * @sdev: SCSI device to configure queue depth for 1234 * @queue_depth: new queue depth 1235 * @reason: calling context 1236 * 1237 * libsas and libata have different approaches for associating a sdev to 1238 * its ata_port. 1239 * 1240 */ 1241 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1242 int queue_depth, int reason) 1243 { 1244 struct ata_device *dev; 1245 unsigned long flags; 1246 1247 if (reason != SCSI_QDEPTH_DEFAULT) 1248 return -EOPNOTSUPP; 1249 1250 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1251 return sdev->queue_depth; 1252 1253 dev = ata_scsi_find_dev(ap, sdev); 1254 if (!dev || !ata_dev_enabled(dev)) 1255 return sdev->queue_depth; 1256 1257 /* NCQ enabled? */ 1258 spin_lock_irqsave(ap->lock, flags); 1259 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1260 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1261 dev->flags |= ATA_DFLAG_NCQ_OFF; 1262 queue_depth = 1; 1263 } 1264 spin_unlock_irqrestore(ap->lock, flags); 1265 1266 /* limit and apply queue depth */ 1267 queue_depth = min(queue_depth, sdev->host->can_queue); 1268 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1269 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1270 1271 if (sdev->queue_depth == queue_depth) 1272 return -EINVAL; 1273 1274 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1275 return queue_depth; 1276 } 1277 1278 /** 1279 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1280 * @sdev: SCSI device to configure queue depth for 1281 * @queue_depth: new queue depth 1282 * @reason: calling context 1283 * 1284 * This is libata standard hostt->change_queue_depth callback. 1285 * SCSI will call into this callback when user tries to set queue 1286 * depth via sysfs. 1287 * 1288 * LOCKING: 1289 * SCSI layer (we don't care) 1290 * 1291 * RETURNS: 1292 * Newly configured queue depth. 1293 */ 1294 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1295 int reason) 1296 { 1297 struct ata_port *ap = ata_shost_to_port(sdev->host); 1298 1299 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1300 } 1301 1302 /** 1303 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1304 * @qc: Storage for translated ATA taskfile 1305 * 1306 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1307 * (to start). Perhaps these commands should be preceded by 1308 * CHECK POWER MODE to see what power mode the device is already in. 1309 * [See SAT revision 5 at www.t10.org] 1310 * 1311 * LOCKING: 1312 * spin_lock_irqsave(host lock) 1313 * 1314 * RETURNS: 1315 * Zero on success, non-zero on error. 1316 */ 1317 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1318 { 1319 struct scsi_cmnd *scmd = qc->scsicmd; 1320 struct ata_taskfile *tf = &qc->tf; 1321 const u8 *cdb = scmd->cmnd; 1322 1323 if (scmd->cmd_len < 5) 1324 goto invalid_fld; 1325 1326 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1327 tf->protocol = ATA_PROT_NODATA; 1328 if (cdb[1] & 0x1) { 1329 ; /* ignore IMMED bit, violates sat-r05 */ 1330 } 1331 if (cdb[4] & 0x2) 1332 goto invalid_fld; /* LOEJ bit set not supported */ 1333 if (((cdb[4] >> 4) & 0xf) != 0) 1334 goto invalid_fld; /* power conditions not supported */ 1335 1336 if (cdb[4] & 0x1) { 1337 tf->nsect = 1; /* 1 sector, lba=0 */ 1338 1339 if (qc->dev->flags & ATA_DFLAG_LBA) { 1340 tf->flags |= ATA_TFLAG_LBA; 1341 1342 tf->lbah = 0x0; 1343 tf->lbam = 0x0; 1344 tf->lbal = 0x0; 1345 tf->device |= ATA_LBA; 1346 } else { 1347 /* CHS */ 1348 tf->lbal = 0x1; /* sect */ 1349 tf->lbam = 0x0; /* cyl low */ 1350 tf->lbah = 0x0; /* cyl high */ 1351 } 1352 1353 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1354 } else { 1355 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1356 * or S5) causing some drives to spin up and down again. 1357 */ 1358 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1359 system_state == SYSTEM_POWER_OFF) 1360 goto skip; 1361 1362 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1363 system_entering_hibernation()) 1364 goto skip; 1365 1366 /* Issue ATA STANDBY IMMEDIATE command */ 1367 tf->command = ATA_CMD_STANDBYNOW1; 1368 } 1369 1370 /* 1371 * Standby and Idle condition timers could be implemented but that 1372 * would require libata to implement the Power condition mode page 1373 * and allow the user to change it. Changing mode pages requires 1374 * MODE SELECT to be implemented. 1375 */ 1376 1377 return 0; 1378 1379 invalid_fld: 1380 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1381 /* "Invalid field in cbd" */ 1382 return 1; 1383 skip: 1384 scmd->result = SAM_STAT_GOOD; 1385 return 1; 1386 } 1387 1388 1389 /** 1390 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1391 * @qc: Storage for translated ATA taskfile 1392 * 1393 * Sets up an ATA taskfile to issue FLUSH CACHE or 1394 * FLUSH CACHE EXT. 1395 * 1396 * LOCKING: 1397 * spin_lock_irqsave(host lock) 1398 * 1399 * RETURNS: 1400 * Zero on success, non-zero on error. 1401 */ 1402 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1403 { 1404 struct ata_taskfile *tf = &qc->tf; 1405 1406 tf->flags |= ATA_TFLAG_DEVICE; 1407 tf->protocol = ATA_PROT_NODATA; 1408 1409 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1410 tf->command = ATA_CMD_FLUSH_EXT; 1411 else 1412 tf->command = ATA_CMD_FLUSH; 1413 1414 /* flush is critical for IO integrity, consider it an IO command */ 1415 qc->flags |= ATA_QCFLAG_IO; 1416 1417 return 0; 1418 } 1419 1420 /** 1421 * scsi_6_lba_len - Get LBA and transfer length 1422 * @cdb: SCSI command to translate 1423 * 1424 * Calculate LBA and transfer length for 6-byte commands. 1425 * 1426 * RETURNS: 1427 * @plba: the LBA 1428 * @plen: the transfer length 1429 */ 1430 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1431 { 1432 u64 lba = 0; 1433 u32 len; 1434 1435 VPRINTK("six-byte command\n"); 1436 1437 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1438 lba |= ((u64)cdb[2]) << 8; 1439 lba |= ((u64)cdb[3]); 1440 1441 len = cdb[4]; 1442 1443 *plba = lba; 1444 *plen = len; 1445 } 1446 1447 /** 1448 * scsi_10_lba_len - Get LBA and transfer length 1449 * @cdb: SCSI command to translate 1450 * 1451 * Calculate LBA and transfer length for 10-byte commands. 1452 * 1453 * RETURNS: 1454 * @plba: the LBA 1455 * @plen: the transfer length 1456 */ 1457 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1458 { 1459 u64 lba = 0; 1460 u32 len = 0; 1461 1462 VPRINTK("ten-byte command\n"); 1463 1464 lba |= ((u64)cdb[2]) << 24; 1465 lba |= ((u64)cdb[3]) << 16; 1466 lba |= ((u64)cdb[4]) << 8; 1467 lba |= ((u64)cdb[5]); 1468 1469 len |= ((u32)cdb[7]) << 8; 1470 len |= ((u32)cdb[8]); 1471 1472 *plba = lba; 1473 *plen = len; 1474 } 1475 1476 /** 1477 * scsi_16_lba_len - Get LBA and transfer length 1478 * @cdb: SCSI command to translate 1479 * 1480 * Calculate LBA and transfer length for 16-byte commands. 1481 * 1482 * RETURNS: 1483 * @plba: the LBA 1484 * @plen: the transfer length 1485 */ 1486 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1487 { 1488 u64 lba = 0; 1489 u32 len = 0; 1490 1491 VPRINTK("sixteen-byte command\n"); 1492 1493 lba |= ((u64)cdb[2]) << 56; 1494 lba |= ((u64)cdb[3]) << 48; 1495 lba |= ((u64)cdb[4]) << 40; 1496 lba |= ((u64)cdb[5]) << 32; 1497 lba |= ((u64)cdb[6]) << 24; 1498 lba |= ((u64)cdb[7]) << 16; 1499 lba |= ((u64)cdb[8]) << 8; 1500 lba |= ((u64)cdb[9]); 1501 1502 len |= ((u32)cdb[10]) << 24; 1503 len |= ((u32)cdb[11]) << 16; 1504 len |= ((u32)cdb[12]) << 8; 1505 len |= ((u32)cdb[13]); 1506 1507 *plba = lba; 1508 *plen = len; 1509 } 1510 1511 /** 1512 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1513 * @qc: Storage for translated ATA taskfile 1514 * 1515 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1516 * 1517 * LOCKING: 1518 * spin_lock_irqsave(host lock) 1519 * 1520 * RETURNS: 1521 * Zero on success, non-zero on error. 1522 */ 1523 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1524 { 1525 struct scsi_cmnd *scmd = qc->scsicmd; 1526 struct ata_taskfile *tf = &qc->tf; 1527 struct ata_device *dev = qc->dev; 1528 u64 dev_sectors = qc->dev->n_sectors; 1529 const u8 *cdb = scmd->cmnd; 1530 u64 block; 1531 u32 n_block; 1532 1533 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1534 tf->protocol = ATA_PROT_NODATA; 1535 1536 if (cdb[0] == VERIFY) { 1537 if (scmd->cmd_len < 10) 1538 goto invalid_fld; 1539 scsi_10_lba_len(cdb, &block, &n_block); 1540 } else if (cdb[0] == VERIFY_16) { 1541 if (scmd->cmd_len < 16) 1542 goto invalid_fld; 1543 scsi_16_lba_len(cdb, &block, &n_block); 1544 } else 1545 goto invalid_fld; 1546 1547 if (!n_block) 1548 goto nothing_to_do; 1549 if (block >= dev_sectors) 1550 goto out_of_range; 1551 if ((block + n_block) > dev_sectors) 1552 goto out_of_range; 1553 1554 if (dev->flags & ATA_DFLAG_LBA) { 1555 tf->flags |= ATA_TFLAG_LBA; 1556 1557 if (lba_28_ok(block, n_block)) { 1558 /* use LBA28 */ 1559 tf->command = ATA_CMD_VERIFY; 1560 tf->device |= (block >> 24) & 0xf; 1561 } else if (lba_48_ok(block, n_block)) { 1562 if (!(dev->flags & ATA_DFLAG_LBA48)) 1563 goto out_of_range; 1564 1565 /* use LBA48 */ 1566 tf->flags |= ATA_TFLAG_LBA48; 1567 tf->command = ATA_CMD_VERIFY_EXT; 1568 1569 tf->hob_nsect = (n_block >> 8) & 0xff; 1570 1571 tf->hob_lbah = (block >> 40) & 0xff; 1572 tf->hob_lbam = (block >> 32) & 0xff; 1573 tf->hob_lbal = (block >> 24) & 0xff; 1574 } else 1575 /* request too large even for LBA48 */ 1576 goto out_of_range; 1577 1578 tf->nsect = n_block & 0xff; 1579 1580 tf->lbah = (block >> 16) & 0xff; 1581 tf->lbam = (block >> 8) & 0xff; 1582 tf->lbal = block & 0xff; 1583 1584 tf->device |= ATA_LBA; 1585 } else { 1586 /* CHS */ 1587 u32 sect, head, cyl, track; 1588 1589 if (!lba_28_ok(block, n_block)) 1590 goto out_of_range; 1591 1592 /* Convert LBA to CHS */ 1593 track = (u32)block / dev->sectors; 1594 cyl = track / dev->heads; 1595 head = track % dev->heads; 1596 sect = (u32)block % dev->sectors + 1; 1597 1598 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1599 (u32)block, track, cyl, head, sect); 1600 1601 /* Check whether the converted CHS can fit. 1602 Cylinder: 0-65535 1603 Head: 0-15 1604 Sector: 1-255*/ 1605 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1606 goto out_of_range; 1607 1608 tf->command = ATA_CMD_VERIFY; 1609 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1610 tf->lbal = sect; 1611 tf->lbam = cyl; 1612 tf->lbah = cyl >> 8; 1613 tf->device |= head; 1614 } 1615 1616 return 0; 1617 1618 invalid_fld: 1619 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1620 /* "Invalid field in cbd" */ 1621 return 1; 1622 1623 out_of_range: 1624 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1625 /* "Logical Block Address out of range" */ 1626 return 1; 1627 1628 nothing_to_do: 1629 scmd->result = SAM_STAT_GOOD; 1630 return 1; 1631 } 1632 1633 /** 1634 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1635 * @qc: Storage for translated ATA taskfile 1636 * 1637 * Converts any of six SCSI read/write commands into the 1638 * ATA counterpart, including starting sector (LBA), 1639 * sector count, and taking into account the device's LBA48 1640 * support. 1641 * 1642 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1643 * %WRITE_16 are currently supported. 1644 * 1645 * LOCKING: 1646 * spin_lock_irqsave(host lock) 1647 * 1648 * RETURNS: 1649 * Zero on success, non-zero on error. 1650 */ 1651 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1652 { 1653 struct scsi_cmnd *scmd = qc->scsicmd; 1654 const u8 *cdb = scmd->cmnd; 1655 unsigned int tf_flags = 0; 1656 u64 block; 1657 u32 n_block; 1658 int rc; 1659 1660 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1661 tf_flags |= ATA_TFLAG_WRITE; 1662 1663 /* Calculate the SCSI LBA, transfer length and FUA. */ 1664 switch (cdb[0]) { 1665 case READ_10: 1666 case WRITE_10: 1667 if (unlikely(scmd->cmd_len < 10)) 1668 goto invalid_fld; 1669 scsi_10_lba_len(cdb, &block, &n_block); 1670 if (cdb[1] & (1 << 3)) 1671 tf_flags |= ATA_TFLAG_FUA; 1672 break; 1673 case READ_6: 1674 case WRITE_6: 1675 if (unlikely(scmd->cmd_len < 6)) 1676 goto invalid_fld; 1677 scsi_6_lba_len(cdb, &block, &n_block); 1678 1679 /* for 6-byte r/w commands, transfer length 0 1680 * means 256 blocks of data, not 0 block. 1681 */ 1682 if (!n_block) 1683 n_block = 256; 1684 break; 1685 case READ_16: 1686 case WRITE_16: 1687 if (unlikely(scmd->cmd_len < 16)) 1688 goto invalid_fld; 1689 scsi_16_lba_len(cdb, &block, &n_block); 1690 if (cdb[1] & (1 << 3)) 1691 tf_flags |= ATA_TFLAG_FUA; 1692 break; 1693 default: 1694 DPRINTK("no-byte command\n"); 1695 goto invalid_fld; 1696 } 1697 1698 /* Check and compose ATA command */ 1699 if (!n_block) 1700 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1701 * length 0 means transfer 0 block of data. 1702 * However, for ATA R/W commands, sector count 0 means 1703 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1704 * 1705 * WARNING: one or two older ATA drives treat 0 as 0... 1706 */ 1707 goto nothing_to_do; 1708 1709 qc->flags |= ATA_QCFLAG_IO; 1710 qc->nbytes = n_block * scmd->device->sector_size; 1711 1712 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1713 qc->tag); 1714 if (likely(rc == 0)) 1715 return 0; 1716 1717 if (rc == -ERANGE) 1718 goto out_of_range; 1719 /* treat all other errors as -EINVAL, fall through */ 1720 invalid_fld: 1721 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1722 /* "Invalid field in cbd" */ 1723 return 1; 1724 1725 out_of_range: 1726 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1727 /* "Logical Block Address out of range" */ 1728 return 1; 1729 1730 nothing_to_do: 1731 scmd->result = SAM_STAT_GOOD; 1732 return 1; 1733 } 1734 1735 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1736 { 1737 struct ata_port *ap = qc->ap; 1738 struct scsi_cmnd *cmd = qc->scsicmd; 1739 u8 *cdb = cmd->cmnd; 1740 int need_sense = (qc->err_mask != 0); 1741 1742 /* For ATA pass thru (SAT) commands, generate a sense block if 1743 * user mandated it or if there's an error. Note that if we 1744 * generate because the user forced us to [CK_COND =1], a check 1745 * condition is generated and the ATA register values are returned 1746 * whether the command completed successfully or not. If there 1747 * was no error, we use the following sense data: 1748 * sk = RECOVERED ERROR 1749 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1750 */ 1751 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1752 ((cdb[2] & 0x20) || need_sense)) { 1753 ata_gen_passthru_sense(qc); 1754 } else { 1755 if (!need_sense) { 1756 cmd->result = SAM_STAT_GOOD; 1757 } else { 1758 /* TODO: decide which descriptor format to use 1759 * for 48b LBA devices and call that here 1760 * instead of the fixed desc, which is only 1761 * good for smaller LBA (and maybe CHS?) 1762 * devices. 1763 */ 1764 ata_gen_ata_sense(qc); 1765 } 1766 } 1767 1768 if (need_sense && !ap->ops->error_handler) 1769 ata_dump_status(ap->print_id, &qc->result_tf); 1770 1771 qc->scsidone(cmd); 1772 1773 ata_qc_free(qc); 1774 } 1775 1776 /** 1777 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1778 * @dev: ATA device to which the command is addressed 1779 * @cmd: SCSI command to execute 1780 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1781 * 1782 * Our ->queuecommand() function has decided that the SCSI 1783 * command issued can be directly translated into an ATA 1784 * command, rather than handled internally. 1785 * 1786 * This function sets up an ata_queued_cmd structure for the 1787 * SCSI command, and sends that ata_queued_cmd to the hardware. 1788 * 1789 * The xlat_func argument (actor) returns 0 if ready to execute 1790 * ATA command, else 1 to finish translation. If 1 is returned 1791 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1792 * to be set reflecting an error condition or clean (early) 1793 * termination. 1794 * 1795 * LOCKING: 1796 * spin_lock_irqsave(host lock) 1797 * 1798 * RETURNS: 1799 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1800 * needs to be deferred. 1801 */ 1802 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1803 ata_xlat_func_t xlat_func) 1804 { 1805 struct ata_port *ap = dev->link->ap; 1806 struct ata_queued_cmd *qc; 1807 int rc; 1808 1809 VPRINTK("ENTER\n"); 1810 1811 qc = ata_scsi_qc_new(dev, cmd); 1812 if (!qc) 1813 goto err_mem; 1814 1815 /* data is present; dma-map it */ 1816 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1817 cmd->sc_data_direction == DMA_TO_DEVICE) { 1818 if (unlikely(scsi_bufflen(cmd) < 1)) { 1819 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1820 goto err_did; 1821 } 1822 1823 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1824 1825 qc->dma_dir = cmd->sc_data_direction; 1826 } 1827 1828 qc->complete_fn = ata_scsi_qc_complete; 1829 1830 if (xlat_func(qc)) 1831 goto early_finish; 1832 1833 if (ap->ops->qc_defer) { 1834 if ((rc = ap->ops->qc_defer(qc))) 1835 goto defer; 1836 } 1837 1838 /* select device, send command to hardware */ 1839 ata_qc_issue(qc); 1840 1841 VPRINTK("EXIT\n"); 1842 return 0; 1843 1844 early_finish: 1845 ata_qc_free(qc); 1846 cmd->scsi_done(cmd); 1847 DPRINTK("EXIT - early finish (good or error)\n"); 1848 return 0; 1849 1850 err_did: 1851 ata_qc_free(qc); 1852 cmd->result = (DID_ERROR << 16); 1853 cmd->scsi_done(cmd); 1854 err_mem: 1855 DPRINTK("EXIT - internal\n"); 1856 return 0; 1857 1858 defer: 1859 ata_qc_free(qc); 1860 DPRINTK("EXIT - defer\n"); 1861 if (rc == ATA_DEFER_LINK) 1862 return SCSI_MLQUEUE_DEVICE_BUSY; 1863 else 1864 return SCSI_MLQUEUE_HOST_BUSY; 1865 } 1866 1867 /** 1868 * ata_scsi_rbuf_get - Map response buffer. 1869 * @cmd: SCSI command containing buffer to be mapped. 1870 * @flags: unsigned long variable to store irq enable status 1871 * @copy_in: copy in from user buffer 1872 * 1873 * Prepare buffer for simulated SCSI commands. 1874 * 1875 * LOCKING: 1876 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1877 * 1878 * RETURNS: 1879 * Pointer to response buffer. 1880 */ 1881 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1882 unsigned long *flags) 1883 { 1884 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1885 1886 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1887 if (copy_in) 1888 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1889 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1890 return ata_scsi_rbuf; 1891 } 1892 1893 /** 1894 * ata_scsi_rbuf_put - Unmap response buffer. 1895 * @cmd: SCSI command containing buffer to be unmapped. 1896 * @copy_out: copy out result 1897 * @flags: @flags passed to ata_scsi_rbuf_get() 1898 * 1899 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1900 * @copy_back is true. 1901 * 1902 * LOCKING: 1903 * Unlocks ata_scsi_rbuf_lock. 1904 */ 1905 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1906 unsigned long *flags) 1907 { 1908 if (copy_out) 1909 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1910 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1911 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1912 } 1913 1914 /** 1915 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1916 * @args: device IDENTIFY data / SCSI command of interest. 1917 * @actor: Callback hook for desired SCSI command simulator 1918 * 1919 * Takes care of the hard work of simulating a SCSI command... 1920 * Mapping the response buffer, calling the command's handler, 1921 * and handling the handler's return value. This return value 1922 * indicates whether the handler wishes the SCSI command to be 1923 * completed successfully (0), or not (in which case cmd->result 1924 * and sense buffer are assumed to be set). 1925 * 1926 * LOCKING: 1927 * spin_lock_irqsave(host lock) 1928 */ 1929 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1930 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1931 { 1932 u8 *rbuf; 1933 unsigned int rc; 1934 struct scsi_cmnd *cmd = args->cmd; 1935 unsigned long flags; 1936 1937 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1938 rc = actor(args, rbuf); 1939 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1940 1941 if (rc == 0) 1942 cmd->result = SAM_STAT_GOOD; 1943 args->done(cmd); 1944 } 1945 1946 /** 1947 * ata_scsiop_inq_std - Simulate INQUIRY command 1948 * @args: device IDENTIFY data / SCSI command of interest. 1949 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1950 * 1951 * Returns standard device identification data associated 1952 * with non-VPD INQUIRY command output. 1953 * 1954 * LOCKING: 1955 * spin_lock_irqsave(host lock) 1956 */ 1957 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1958 { 1959 const u8 versions[] = { 1960 0x60, /* SAM-3 (no version claimed) */ 1961 1962 0x03, 1963 0x20, /* SBC-2 (no version claimed) */ 1964 1965 0x02, 1966 0x60 /* SPC-3 (no version claimed) */ 1967 }; 1968 u8 hdr[] = { 1969 TYPE_DISK, 1970 0, 1971 0x5, /* claim SPC-3 version compatibility */ 1972 2, 1973 95 - 4 1974 }; 1975 1976 VPRINTK("ENTER\n"); 1977 1978 /* set scsi removeable (RMB) bit per ata bit */ 1979 if (ata_id_removeable(args->id)) 1980 hdr[1] |= (1 << 7); 1981 1982 memcpy(rbuf, hdr, sizeof(hdr)); 1983 memcpy(&rbuf[8], "ATA ", 8); 1984 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1985 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1986 1987 if (rbuf[32] == 0 || rbuf[32] == ' ') 1988 memcpy(&rbuf[32], "n/a ", 4); 1989 1990 memcpy(rbuf + 59, versions, sizeof(versions)); 1991 1992 return 0; 1993 } 1994 1995 /** 1996 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1997 * @args: device IDENTIFY data / SCSI command of interest. 1998 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1999 * 2000 * Returns list of inquiry VPD pages available. 2001 * 2002 * LOCKING: 2003 * spin_lock_irqsave(host lock) 2004 */ 2005 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2006 { 2007 const u8 pages[] = { 2008 0x00, /* page 0x00, this page */ 2009 0x80, /* page 0x80, unit serial no page */ 2010 0x83, /* page 0x83, device ident page */ 2011 0x89, /* page 0x89, ata info page */ 2012 0xb0, /* page 0xb0, block limits page */ 2013 0xb1, /* page 0xb1, block device characteristics page */ 2014 0xb2, /* page 0xb2, thin provisioning page */ 2015 }; 2016 2017 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2018 memcpy(rbuf + 4, pages, sizeof(pages)); 2019 return 0; 2020 } 2021 2022 /** 2023 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2024 * @args: device IDENTIFY data / SCSI command of interest. 2025 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2026 * 2027 * Returns ATA device serial number. 2028 * 2029 * LOCKING: 2030 * spin_lock_irqsave(host lock) 2031 */ 2032 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2033 { 2034 const u8 hdr[] = { 2035 0, 2036 0x80, /* this page code */ 2037 0, 2038 ATA_ID_SERNO_LEN, /* page len */ 2039 }; 2040 2041 memcpy(rbuf, hdr, sizeof(hdr)); 2042 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2043 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2044 return 0; 2045 } 2046 2047 /** 2048 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2049 * @args: device IDENTIFY data / SCSI command of interest. 2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2051 * 2052 * Yields two logical unit device identification designators: 2053 * - vendor specific ASCII containing the ATA serial number 2054 * - SAT defined "t10 vendor id based" containing ASCII vendor 2055 * name ("ATA "), model and serial numbers. 2056 * 2057 * LOCKING: 2058 * spin_lock_irqsave(host lock) 2059 */ 2060 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2061 { 2062 const int sat_model_serial_desc_len = 68; 2063 int num; 2064 2065 rbuf[1] = 0x83; /* this page code */ 2066 num = 4; 2067 2068 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2069 rbuf[num + 0] = 2; 2070 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2071 num += 4; 2072 ata_id_string(args->id, (unsigned char *) rbuf + num, 2073 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2074 num += ATA_ID_SERNO_LEN; 2075 2076 /* SAT defined lu model and serial numbers descriptor */ 2077 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2078 rbuf[num + 0] = 2; 2079 rbuf[num + 1] = 1; 2080 rbuf[num + 3] = sat_model_serial_desc_len; 2081 num += 4; 2082 memcpy(rbuf + num, "ATA ", 8); 2083 num += 8; 2084 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2085 ATA_ID_PROD_LEN); 2086 num += ATA_ID_PROD_LEN; 2087 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2088 ATA_ID_SERNO_LEN); 2089 num += ATA_ID_SERNO_LEN; 2090 2091 if (ata_id_has_wwn(args->id)) { 2092 /* SAT defined lu world wide name */ 2093 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2094 rbuf[num + 0] = 1; 2095 rbuf[num + 1] = 3; 2096 rbuf[num + 3] = ATA_ID_WWN_LEN; 2097 num += 4; 2098 ata_id_string(args->id, (unsigned char *) rbuf + num, 2099 ATA_ID_WWN, ATA_ID_WWN_LEN); 2100 num += ATA_ID_WWN_LEN; 2101 } 2102 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2103 return 0; 2104 } 2105 2106 /** 2107 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2108 * @args: device IDENTIFY data / SCSI command of interest. 2109 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2110 * 2111 * Yields SAT-specified ATA VPD page. 2112 * 2113 * LOCKING: 2114 * spin_lock_irqsave(host lock) 2115 */ 2116 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2117 { 2118 struct ata_taskfile tf; 2119 2120 memset(&tf, 0, sizeof(tf)); 2121 2122 rbuf[1] = 0x89; /* our page code */ 2123 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2124 rbuf[3] = (0x238 & 0xff); 2125 2126 memcpy(&rbuf[8], "linux ", 8); 2127 memcpy(&rbuf[16], "libata ", 16); 2128 memcpy(&rbuf[32], DRV_VERSION, 4); 2129 2130 /* we don't store the ATA device signature, so we fake it */ 2131 2132 tf.command = ATA_DRDY; /* really, this is Status reg */ 2133 tf.lbal = 0x1; 2134 tf.nsect = 0x1; 2135 2136 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2137 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2138 2139 rbuf[56] = ATA_CMD_ID_ATA; 2140 2141 memcpy(&rbuf[60], &args->id[0], 512); 2142 return 0; 2143 } 2144 2145 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2146 { 2147 u16 min_io_sectors; 2148 2149 rbuf[1] = 0xb0; 2150 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2151 2152 /* 2153 * Optimal transfer length granularity. 2154 * 2155 * This is always one physical block, but for disks with a smaller 2156 * logical than physical sector size we need to figure out what the 2157 * latter is. 2158 */ 2159 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2160 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2161 2162 /* 2163 * Optimal unmap granularity. 2164 * 2165 * The ATA spec doesn't even know about a granularity or alignment 2166 * for the TRIM command. We can leave away most of the unmap related 2167 * VPD page entries, but we have specifify a granularity to signal 2168 * that we support some form of unmap - in thise case via WRITE SAME 2169 * with the unmap bit set. 2170 */ 2171 if (ata_id_has_trim(args->id)) { 2172 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2173 put_unaligned_be32(1, &rbuf[28]); 2174 } 2175 2176 return 0; 2177 } 2178 2179 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2180 { 2181 int form_factor = ata_id_form_factor(args->id); 2182 int media_rotation_rate = ata_id_rotation_rate(args->id); 2183 2184 rbuf[1] = 0xb1; 2185 rbuf[3] = 0x3c; 2186 rbuf[4] = media_rotation_rate >> 8; 2187 rbuf[5] = media_rotation_rate; 2188 rbuf[7] = form_factor; 2189 2190 return 0; 2191 } 2192 2193 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2194 { 2195 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2196 rbuf[1] = 0xb2; 2197 rbuf[3] = 0x4; 2198 rbuf[5] = 1 << 6; /* TPWS */ 2199 2200 return 0; 2201 } 2202 2203 /** 2204 * ata_scsiop_noop - Command handler that simply returns success. 2205 * @args: device IDENTIFY data / SCSI command of interest. 2206 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2207 * 2208 * No operation. Simply returns success to caller, to indicate 2209 * that the caller should successfully complete this SCSI command. 2210 * 2211 * LOCKING: 2212 * spin_lock_irqsave(host lock) 2213 */ 2214 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2215 { 2216 VPRINTK("ENTER\n"); 2217 return 0; 2218 } 2219 2220 /** 2221 * modecpy - Prepare response for MODE SENSE 2222 * @dest: output buffer 2223 * @src: data being copied 2224 * @n: length of mode page 2225 * @changeable: whether changeable parameters are requested 2226 * 2227 * Generate a generic MODE SENSE page for either current or changeable 2228 * parameters. 2229 * 2230 * LOCKING: 2231 * None. 2232 */ 2233 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2234 { 2235 if (changeable) { 2236 memcpy(dest, src, 2); 2237 memset(dest + 2, 0, n - 2); 2238 } else { 2239 memcpy(dest, src, n); 2240 } 2241 } 2242 2243 /** 2244 * ata_msense_caching - Simulate MODE SENSE caching info page 2245 * @id: device IDENTIFY data 2246 * @buf: output buffer 2247 * @changeable: whether changeable parameters are requested 2248 * 2249 * Generate a caching info page, which conditionally indicates 2250 * write caching to the SCSI layer, depending on device 2251 * capabilities. 2252 * 2253 * LOCKING: 2254 * None. 2255 */ 2256 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2257 { 2258 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2259 if (changeable || ata_id_wcache_enabled(id)) 2260 buf[2] |= (1 << 2); /* write cache enable */ 2261 if (!changeable && !ata_id_rahead_enabled(id)) 2262 buf[12] |= (1 << 5); /* disable read ahead */ 2263 return sizeof(def_cache_mpage); 2264 } 2265 2266 /** 2267 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2268 * @buf: output buffer 2269 * @changeable: whether changeable parameters are requested 2270 * 2271 * Generate a generic MODE SENSE control mode page. 2272 * 2273 * LOCKING: 2274 * None. 2275 */ 2276 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2277 { 2278 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2279 return sizeof(def_control_mpage); 2280 } 2281 2282 /** 2283 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2284 * @buf: output buffer 2285 * @changeable: whether changeable parameters are requested 2286 * 2287 * Generate a generic MODE SENSE r/w error recovery page. 2288 * 2289 * LOCKING: 2290 * None. 2291 */ 2292 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2293 { 2294 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2295 changeable); 2296 return sizeof(def_rw_recovery_mpage); 2297 } 2298 2299 /* 2300 * We can turn this into a real blacklist if it's needed, for now just 2301 * blacklist any Maxtor BANC1G10 revision firmware 2302 */ 2303 static int ata_dev_supports_fua(u16 *id) 2304 { 2305 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2306 2307 if (!libata_fua) 2308 return 0; 2309 if (!ata_id_has_fua(id)) 2310 return 0; 2311 2312 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2313 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2314 2315 if (strcmp(model, "Maxtor")) 2316 return 1; 2317 if (strcmp(fw, "BANC1G10")) 2318 return 1; 2319 2320 return 0; /* blacklisted */ 2321 } 2322 2323 /** 2324 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2325 * @args: device IDENTIFY data / SCSI command of interest. 2326 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2327 * 2328 * Simulate MODE SENSE commands. Assume this is invoked for direct 2329 * access devices (e.g. disks) only. There should be no block 2330 * descriptor for other device types. 2331 * 2332 * LOCKING: 2333 * spin_lock_irqsave(host lock) 2334 */ 2335 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2336 { 2337 struct ata_device *dev = args->dev; 2338 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2339 const u8 sat_blk_desc[] = { 2340 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2341 0, 2342 0, 0x2, 0x0 /* block length: 512 bytes */ 2343 }; 2344 u8 pg, spg; 2345 unsigned int ebd, page_control, six_byte; 2346 u8 dpofua; 2347 2348 VPRINTK("ENTER\n"); 2349 2350 six_byte = (scsicmd[0] == MODE_SENSE); 2351 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2352 /* 2353 * LLBA bit in msense(10) ignored (compliant) 2354 */ 2355 2356 page_control = scsicmd[2] >> 6; 2357 switch (page_control) { 2358 case 0: /* current */ 2359 case 1: /* changeable */ 2360 case 2: /* defaults */ 2361 break; /* supported */ 2362 case 3: /* saved */ 2363 goto saving_not_supp; 2364 default: 2365 goto invalid_fld; 2366 } 2367 2368 if (six_byte) 2369 p += 4 + (ebd ? 8 : 0); 2370 else 2371 p += 8 + (ebd ? 8 : 0); 2372 2373 pg = scsicmd[2] & 0x3f; 2374 spg = scsicmd[3]; 2375 /* 2376 * No mode subpages supported (yet) but asking for _all_ 2377 * subpages may be valid 2378 */ 2379 if (spg && (spg != ALL_SUB_MPAGES)) 2380 goto invalid_fld; 2381 2382 switch(pg) { 2383 case RW_RECOVERY_MPAGE: 2384 p += ata_msense_rw_recovery(p, page_control == 1); 2385 break; 2386 2387 case CACHE_MPAGE: 2388 p += ata_msense_caching(args->id, p, page_control == 1); 2389 break; 2390 2391 case CONTROL_MPAGE: 2392 p += ata_msense_ctl_mode(p, page_control == 1); 2393 break; 2394 2395 case ALL_MPAGES: 2396 p += ata_msense_rw_recovery(p, page_control == 1); 2397 p += ata_msense_caching(args->id, p, page_control == 1); 2398 p += ata_msense_ctl_mode(p, page_control == 1); 2399 break; 2400 2401 default: /* invalid page code */ 2402 goto invalid_fld; 2403 } 2404 2405 dpofua = 0; 2406 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2407 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2408 dpofua = 1 << 4; 2409 2410 if (six_byte) { 2411 rbuf[0] = p - rbuf - 1; 2412 rbuf[2] |= dpofua; 2413 if (ebd) { 2414 rbuf[3] = sizeof(sat_blk_desc); 2415 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2416 } 2417 } else { 2418 unsigned int output_len = p - rbuf - 2; 2419 2420 rbuf[0] = output_len >> 8; 2421 rbuf[1] = output_len; 2422 rbuf[3] |= dpofua; 2423 if (ebd) { 2424 rbuf[7] = sizeof(sat_blk_desc); 2425 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2426 } 2427 } 2428 return 0; 2429 2430 invalid_fld: 2431 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2432 /* "Invalid field in cbd" */ 2433 return 1; 2434 2435 saving_not_supp: 2436 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2437 /* "Saving parameters not supported" */ 2438 return 1; 2439 } 2440 2441 /** 2442 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2443 * @args: device IDENTIFY data / SCSI command of interest. 2444 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2445 * 2446 * Simulate READ CAPACITY commands. 2447 * 2448 * LOCKING: 2449 * None. 2450 */ 2451 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2452 { 2453 struct ata_device *dev = args->dev; 2454 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2455 u32 sector_size; /* physical sector size in bytes */ 2456 u8 log2_per_phys; 2457 u16 lowest_aligned; 2458 2459 sector_size = ata_id_logical_sector_size(dev->id); 2460 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2461 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2462 2463 VPRINTK("ENTER\n"); 2464 2465 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2466 if (last_lba >= 0xffffffffULL) 2467 last_lba = 0xffffffff; 2468 2469 /* sector count, 32-bit */ 2470 rbuf[0] = last_lba >> (8 * 3); 2471 rbuf[1] = last_lba >> (8 * 2); 2472 rbuf[2] = last_lba >> (8 * 1); 2473 rbuf[3] = last_lba; 2474 2475 /* sector size */ 2476 rbuf[4] = sector_size >> (8 * 3); 2477 rbuf[5] = sector_size >> (8 * 2); 2478 rbuf[6] = sector_size >> (8 * 1); 2479 rbuf[7] = sector_size; 2480 } else { 2481 /* sector count, 64-bit */ 2482 rbuf[0] = last_lba >> (8 * 7); 2483 rbuf[1] = last_lba >> (8 * 6); 2484 rbuf[2] = last_lba >> (8 * 5); 2485 rbuf[3] = last_lba >> (8 * 4); 2486 rbuf[4] = last_lba >> (8 * 3); 2487 rbuf[5] = last_lba >> (8 * 2); 2488 rbuf[6] = last_lba >> (8 * 1); 2489 rbuf[7] = last_lba; 2490 2491 /* sector size */ 2492 rbuf[ 8] = sector_size >> (8 * 3); 2493 rbuf[ 9] = sector_size >> (8 * 2); 2494 rbuf[10] = sector_size >> (8 * 1); 2495 rbuf[11] = sector_size; 2496 2497 rbuf[12] = 0; 2498 rbuf[13] = log2_per_phys; 2499 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2500 rbuf[15] = lowest_aligned; 2501 2502 if (ata_id_has_trim(args->id)) { 2503 rbuf[14] |= 0x80; /* TPE */ 2504 2505 if (ata_id_has_zero_after_trim(args->id)) 2506 rbuf[14] |= 0x40; /* TPRZ */ 2507 } 2508 } 2509 2510 return 0; 2511 } 2512 2513 /** 2514 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2515 * @args: device IDENTIFY data / SCSI command of interest. 2516 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2517 * 2518 * Simulate REPORT LUNS command. 2519 * 2520 * LOCKING: 2521 * spin_lock_irqsave(host lock) 2522 */ 2523 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2524 { 2525 VPRINTK("ENTER\n"); 2526 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2527 2528 return 0; 2529 } 2530 2531 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2532 { 2533 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2534 /* FIXME: not quite right; we don't want the 2535 * translation of taskfile registers into 2536 * a sense descriptors, since that's only 2537 * correct for ATA, not ATAPI 2538 */ 2539 ata_gen_passthru_sense(qc); 2540 } 2541 2542 qc->scsidone(qc->scsicmd); 2543 ata_qc_free(qc); 2544 } 2545 2546 /* is it pointless to prefer PIO for "safety reasons"? */ 2547 static inline int ata_pio_use_silly(struct ata_port *ap) 2548 { 2549 return (ap->flags & ATA_FLAG_PIO_DMA); 2550 } 2551 2552 static void atapi_request_sense(struct ata_queued_cmd *qc) 2553 { 2554 struct ata_port *ap = qc->ap; 2555 struct scsi_cmnd *cmd = qc->scsicmd; 2556 2557 DPRINTK("ATAPI request sense\n"); 2558 2559 /* FIXME: is this needed? */ 2560 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2561 2562 #ifdef CONFIG_ATA_SFF 2563 if (ap->ops->sff_tf_read) 2564 ap->ops->sff_tf_read(ap, &qc->tf); 2565 #endif 2566 2567 /* fill these in, for the case where they are -not- overwritten */ 2568 cmd->sense_buffer[0] = 0x70; 2569 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2570 2571 ata_qc_reinit(qc); 2572 2573 /* setup sg table and init transfer direction */ 2574 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2575 ata_sg_init(qc, &qc->sgent, 1); 2576 qc->dma_dir = DMA_FROM_DEVICE; 2577 2578 memset(&qc->cdb, 0, qc->dev->cdb_len); 2579 qc->cdb[0] = REQUEST_SENSE; 2580 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2581 2582 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2583 qc->tf.command = ATA_CMD_PACKET; 2584 2585 if (ata_pio_use_silly(ap)) { 2586 qc->tf.protocol = ATAPI_PROT_DMA; 2587 qc->tf.feature |= ATAPI_PKT_DMA; 2588 } else { 2589 qc->tf.protocol = ATAPI_PROT_PIO; 2590 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2591 qc->tf.lbah = 0; 2592 } 2593 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2594 2595 qc->complete_fn = atapi_sense_complete; 2596 2597 ata_qc_issue(qc); 2598 2599 DPRINTK("EXIT\n"); 2600 } 2601 2602 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2603 { 2604 struct scsi_cmnd *cmd = qc->scsicmd; 2605 unsigned int err_mask = qc->err_mask; 2606 2607 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2608 2609 /* handle completion from new EH */ 2610 if (unlikely(qc->ap->ops->error_handler && 2611 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2612 2613 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2614 /* FIXME: not quite right; we don't want the 2615 * translation of taskfile registers into a 2616 * sense descriptors, since that's only 2617 * correct for ATA, not ATAPI 2618 */ 2619 ata_gen_passthru_sense(qc); 2620 } 2621 2622 /* SCSI EH automatically locks door if sdev->locked is 2623 * set. Sometimes door lock request continues to 2624 * fail, for example, when no media is present. This 2625 * creates a loop - SCSI EH issues door lock which 2626 * fails and gets invoked again to acquire sense data 2627 * for the failed command. 2628 * 2629 * If door lock fails, always clear sdev->locked to 2630 * avoid this infinite loop. 2631 * 2632 * This may happen before SCSI scan is complete. Make 2633 * sure qc->dev->sdev isn't NULL before dereferencing. 2634 */ 2635 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2636 qc->dev->sdev->locked = 0; 2637 2638 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2639 qc->scsidone(cmd); 2640 ata_qc_free(qc); 2641 return; 2642 } 2643 2644 /* successful completion or old EH failure path */ 2645 if (unlikely(err_mask & AC_ERR_DEV)) { 2646 cmd->result = SAM_STAT_CHECK_CONDITION; 2647 atapi_request_sense(qc); 2648 return; 2649 } else if (unlikely(err_mask)) { 2650 /* FIXME: not quite right; we don't want the 2651 * translation of taskfile registers into 2652 * a sense descriptors, since that's only 2653 * correct for ATA, not ATAPI 2654 */ 2655 ata_gen_passthru_sense(qc); 2656 } else { 2657 u8 *scsicmd = cmd->cmnd; 2658 2659 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2660 unsigned long flags; 2661 u8 *buf; 2662 2663 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2664 2665 /* ATAPI devices typically report zero for their SCSI version, 2666 * and sometimes deviate from the spec WRT response data 2667 * format. If SCSI version is reported as zero like normal, 2668 * then we make the following fixups: 1) Fake MMC-5 version, 2669 * to indicate to the Linux scsi midlayer this is a modern 2670 * device. 2) Ensure response data format / ATAPI information 2671 * are always correct. 2672 */ 2673 if (buf[2] == 0) { 2674 buf[2] = 0x5; 2675 buf[3] = 0x32; 2676 } 2677 2678 ata_scsi_rbuf_put(cmd, true, &flags); 2679 } 2680 2681 cmd->result = SAM_STAT_GOOD; 2682 } 2683 2684 qc->scsidone(cmd); 2685 ata_qc_free(qc); 2686 } 2687 /** 2688 * atapi_xlat - Initialize PACKET taskfile 2689 * @qc: command structure to be initialized 2690 * 2691 * LOCKING: 2692 * spin_lock_irqsave(host lock) 2693 * 2694 * RETURNS: 2695 * Zero on success, non-zero on failure. 2696 */ 2697 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2698 { 2699 struct scsi_cmnd *scmd = qc->scsicmd; 2700 struct ata_device *dev = qc->dev; 2701 int nodata = (scmd->sc_data_direction == DMA_NONE); 2702 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2703 unsigned int nbytes; 2704 2705 memset(qc->cdb, 0, dev->cdb_len); 2706 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2707 2708 qc->complete_fn = atapi_qc_complete; 2709 2710 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2711 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2712 qc->tf.flags |= ATA_TFLAG_WRITE; 2713 DPRINTK("direction: write\n"); 2714 } 2715 2716 qc->tf.command = ATA_CMD_PACKET; 2717 ata_qc_set_pc_nbytes(qc); 2718 2719 /* check whether ATAPI DMA is safe */ 2720 if (!nodata && !using_pio && atapi_check_dma(qc)) 2721 using_pio = 1; 2722 2723 /* Some controller variants snoop this value for Packet 2724 * transfers to do state machine and FIFO management. Thus we 2725 * want to set it properly, and for DMA where it is 2726 * effectively meaningless. 2727 */ 2728 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2729 2730 /* Most ATAPI devices which honor transfer chunk size don't 2731 * behave according to the spec when odd chunk size which 2732 * matches the transfer length is specified. If the number of 2733 * bytes to transfer is 2n+1. According to the spec, what 2734 * should happen is to indicate that 2n+1 is going to be 2735 * transferred and transfer 2n+2 bytes where the last byte is 2736 * padding. 2737 * 2738 * In practice, this doesn't happen. ATAPI devices first 2739 * indicate and transfer 2n bytes and then indicate and 2740 * transfer 2 bytes where the last byte is padding. 2741 * 2742 * This inconsistency confuses several controllers which 2743 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2744 * These controllers use actual number of transferred bytes to 2745 * update DMA poitner and transfer of 4n+2 bytes make those 2746 * controller push DMA pointer by 4n+4 bytes because SATA data 2747 * FISes are aligned to 4 bytes. This causes data corruption 2748 * and buffer overrun. 2749 * 2750 * Always setting nbytes to even number solves this problem 2751 * because then ATAPI devices don't have to split data at 2n 2752 * boundaries. 2753 */ 2754 if (nbytes & 0x1) 2755 nbytes++; 2756 2757 qc->tf.lbam = (nbytes & 0xFF); 2758 qc->tf.lbah = (nbytes >> 8); 2759 2760 if (nodata) 2761 qc->tf.protocol = ATAPI_PROT_NODATA; 2762 else if (using_pio) 2763 qc->tf.protocol = ATAPI_PROT_PIO; 2764 else { 2765 /* DMA data xfer */ 2766 qc->tf.protocol = ATAPI_PROT_DMA; 2767 qc->tf.feature |= ATAPI_PKT_DMA; 2768 2769 if ((dev->flags & ATA_DFLAG_DMADIR) && 2770 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2771 /* some SATA bridges need us to indicate data xfer direction */ 2772 qc->tf.feature |= ATAPI_DMADIR; 2773 } 2774 2775 2776 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2777 as ATAPI tape drives don't get this right otherwise */ 2778 return 0; 2779 } 2780 2781 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2782 { 2783 if (!sata_pmp_attached(ap)) { 2784 if (likely(devno < ata_link_max_devices(&ap->link))) 2785 return &ap->link.device[devno]; 2786 } else { 2787 if (likely(devno < ap->nr_pmp_links)) 2788 return &ap->pmp_link[devno].device[0]; 2789 } 2790 2791 return NULL; 2792 } 2793 2794 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2795 const struct scsi_device *scsidev) 2796 { 2797 int devno; 2798 2799 /* skip commands not addressed to targets we simulate */ 2800 if (!sata_pmp_attached(ap)) { 2801 if (unlikely(scsidev->channel || scsidev->lun)) 2802 return NULL; 2803 devno = scsidev->id; 2804 } else { 2805 if (unlikely(scsidev->id || scsidev->lun)) 2806 return NULL; 2807 devno = scsidev->channel; 2808 } 2809 2810 return ata_find_dev(ap, devno); 2811 } 2812 2813 /** 2814 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2815 * @ap: ATA port to which the device is attached 2816 * @scsidev: SCSI device from which we derive the ATA device 2817 * 2818 * Given various information provided in struct scsi_cmnd, 2819 * map that onto an ATA bus, and using that mapping 2820 * determine which ata_device is associated with the 2821 * SCSI command to be sent. 2822 * 2823 * LOCKING: 2824 * spin_lock_irqsave(host lock) 2825 * 2826 * RETURNS: 2827 * Associated ATA device, or %NULL if not found. 2828 */ 2829 static struct ata_device * 2830 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2831 { 2832 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2833 2834 if (unlikely(!dev || !ata_dev_enabled(dev))) 2835 return NULL; 2836 2837 return dev; 2838 } 2839 2840 /* 2841 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2842 * @byte1: Byte 1 from pass-thru CDB. 2843 * 2844 * RETURNS: 2845 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2846 */ 2847 static u8 2848 ata_scsi_map_proto(u8 byte1) 2849 { 2850 switch((byte1 & 0x1e) >> 1) { 2851 case 3: /* Non-data */ 2852 return ATA_PROT_NODATA; 2853 2854 case 6: /* DMA */ 2855 case 10: /* UDMA Data-in */ 2856 case 11: /* UDMA Data-Out */ 2857 return ATA_PROT_DMA; 2858 2859 case 4: /* PIO Data-in */ 2860 case 5: /* PIO Data-out */ 2861 return ATA_PROT_PIO; 2862 2863 case 0: /* Hard Reset */ 2864 case 1: /* SRST */ 2865 case 8: /* Device Diagnostic */ 2866 case 9: /* Device Reset */ 2867 case 7: /* DMA Queued */ 2868 case 12: /* FPDMA */ 2869 case 15: /* Return Response Info */ 2870 default: /* Reserved */ 2871 break; 2872 } 2873 2874 return ATA_PROT_UNKNOWN; 2875 } 2876 2877 /** 2878 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2879 * @qc: command structure to be initialized 2880 * 2881 * Handles either 12 or 16-byte versions of the CDB. 2882 * 2883 * RETURNS: 2884 * Zero on success, non-zero on failure. 2885 */ 2886 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2887 { 2888 struct ata_taskfile *tf = &(qc->tf); 2889 struct scsi_cmnd *scmd = qc->scsicmd; 2890 struct ata_device *dev = qc->dev; 2891 const u8 *cdb = scmd->cmnd; 2892 2893 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2894 goto invalid_fld; 2895 2896 /* 2897 * 12 and 16 byte CDBs use different offsets to 2898 * provide the various register values. 2899 */ 2900 if (cdb[0] == ATA_16) { 2901 /* 2902 * 16-byte CDB - may contain extended commands. 2903 * 2904 * If that is the case, copy the upper byte register values. 2905 */ 2906 if (cdb[1] & 0x01) { 2907 tf->hob_feature = cdb[3]; 2908 tf->hob_nsect = cdb[5]; 2909 tf->hob_lbal = cdb[7]; 2910 tf->hob_lbam = cdb[9]; 2911 tf->hob_lbah = cdb[11]; 2912 tf->flags |= ATA_TFLAG_LBA48; 2913 } else 2914 tf->flags &= ~ATA_TFLAG_LBA48; 2915 2916 /* 2917 * Always copy low byte, device and command registers. 2918 */ 2919 tf->feature = cdb[4]; 2920 tf->nsect = cdb[6]; 2921 tf->lbal = cdb[8]; 2922 tf->lbam = cdb[10]; 2923 tf->lbah = cdb[12]; 2924 tf->device = cdb[13]; 2925 tf->command = cdb[14]; 2926 } else { 2927 /* 2928 * 12-byte CDB - incapable of extended commands. 2929 */ 2930 tf->flags &= ~ATA_TFLAG_LBA48; 2931 2932 tf->feature = cdb[3]; 2933 tf->nsect = cdb[4]; 2934 tf->lbal = cdb[5]; 2935 tf->lbam = cdb[6]; 2936 tf->lbah = cdb[7]; 2937 tf->device = cdb[8]; 2938 tf->command = cdb[9]; 2939 } 2940 2941 /* enforce correct master/slave bit */ 2942 tf->device = dev->devno ? 2943 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2944 2945 switch (tf->command) { 2946 /* READ/WRITE LONG use a non-standard sect_size */ 2947 case ATA_CMD_READ_LONG: 2948 case ATA_CMD_READ_LONG_ONCE: 2949 case ATA_CMD_WRITE_LONG: 2950 case ATA_CMD_WRITE_LONG_ONCE: 2951 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2952 goto invalid_fld; 2953 qc->sect_size = scsi_bufflen(scmd); 2954 break; 2955 2956 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2957 case ATA_CMD_CFA_WRITE_NE: 2958 case ATA_CMD_CFA_TRANS_SECT: 2959 case ATA_CMD_CFA_WRITE_MULT_NE: 2960 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2961 case ATA_CMD_READ: 2962 case ATA_CMD_READ_EXT: 2963 case ATA_CMD_READ_QUEUED: 2964 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2965 case ATA_CMD_FPDMA_READ: 2966 case ATA_CMD_READ_MULTI: 2967 case ATA_CMD_READ_MULTI_EXT: 2968 case ATA_CMD_PIO_READ: 2969 case ATA_CMD_PIO_READ_EXT: 2970 case ATA_CMD_READ_STREAM_DMA_EXT: 2971 case ATA_CMD_READ_STREAM_EXT: 2972 case ATA_CMD_VERIFY: 2973 case ATA_CMD_VERIFY_EXT: 2974 case ATA_CMD_WRITE: 2975 case ATA_CMD_WRITE_EXT: 2976 case ATA_CMD_WRITE_FUA_EXT: 2977 case ATA_CMD_WRITE_QUEUED: 2978 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2979 case ATA_CMD_FPDMA_WRITE: 2980 case ATA_CMD_WRITE_MULTI: 2981 case ATA_CMD_WRITE_MULTI_EXT: 2982 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2983 case ATA_CMD_PIO_WRITE: 2984 case ATA_CMD_PIO_WRITE_EXT: 2985 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2986 case ATA_CMD_WRITE_STREAM_EXT: 2987 qc->sect_size = scmd->device->sector_size; 2988 break; 2989 2990 /* Everything else uses 512 byte "sectors" */ 2991 default: 2992 qc->sect_size = ATA_SECT_SIZE; 2993 } 2994 2995 /* 2996 * Set flags so that all registers will be written, pass on 2997 * write indication (used for PIO/DMA setup), result TF is 2998 * copied back and we don't whine too much about its failure. 2999 */ 3000 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3001 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3002 tf->flags |= ATA_TFLAG_WRITE; 3003 3004 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3005 3006 /* 3007 * Set transfer length. 3008 * 3009 * TODO: find out if we need to do more here to 3010 * cover scatter/gather case. 3011 */ 3012 ata_qc_set_pc_nbytes(qc); 3013 3014 /* We may not issue DMA commands if no DMA mode is set */ 3015 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3016 goto invalid_fld; 3017 3018 /* sanity check for pio multi commands */ 3019 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3020 goto invalid_fld; 3021 3022 if (is_multi_taskfile(tf)) { 3023 unsigned int multi_count = 1 << (cdb[1] >> 5); 3024 3025 /* compare the passed through multi_count 3026 * with the cached multi_count of libata 3027 */ 3028 if (multi_count != dev->multi_count) 3029 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3030 multi_count); 3031 } 3032 3033 /* 3034 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3035 * SET_FEATURES - XFER MODE must be preceded/succeeded 3036 * by an update to hardware-specific registers for each 3037 * controller (i.e. the reason for ->set_piomode(), 3038 * ->set_dmamode(), and ->post_set_mode() hooks). 3039 */ 3040 if (tf->command == ATA_CMD_SET_FEATURES && 3041 tf->feature == SETFEATURES_XFER) 3042 goto invalid_fld; 3043 3044 /* 3045 * Filter TPM commands by default. These provide an 3046 * essentially uncontrolled encrypted "back door" between 3047 * applications and the disk. Set libata.allow_tpm=1 if you 3048 * have a real reason for wanting to use them. This ensures 3049 * that installed software cannot easily mess stuff up without 3050 * user intent. DVR type users will probably ship with this enabled 3051 * for movie content management. 3052 * 3053 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3054 * for this and should do in future but that it is not sufficient as 3055 * DCS is an optional feature set. Thus we also do the software filter 3056 * so that we comply with the TC consortium stated goal that the user 3057 * can turn off TC features of their system. 3058 */ 3059 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3060 goto invalid_fld; 3061 3062 return 0; 3063 3064 invalid_fld: 3065 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3066 /* "Invalid field in cdb" */ 3067 return 1; 3068 } 3069 3070 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3071 { 3072 struct ata_taskfile *tf = &qc->tf; 3073 struct scsi_cmnd *scmd = qc->scsicmd; 3074 struct ata_device *dev = qc->dev; 3075 const u8 *cdb = scmd->cmnd; 3076 u64 block; 3077 u32 n_block; 3078 u32 size; 3079 void *buf; 3080 3081 /* we may not issue DMA commands if no DMA mode is set */ 3082 if (unlikely(!dev->dma_mode)) 3083 goto invalid_fld; 3084 3085 if (unlikely(scmd->cmd_len < 16)) 3086 goto invalid_fld; 3087 scsi_16_lba_len(cdb, &block, &n_block); 3088 3089 /* for now we only support WRITE SAME with the unmap bit set */ 3090 if (unlikely(!(cdb[1] & 0x8))) 3091 goto invalid_fld; 3092 3093 /* 3094 * WRITE SAME always has a sector sized buffer as payload, this 3095 * should never be a multiple entry S/G list. 3096 */ 3097 if (!scsi_sg_count(scmd)) 3098 goto invalid_fld; 3099 3100 buf = page_address(sg_page(scsi_sglist(scmd))); 3101 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3102 3103 tf->protocol = ATA_PROT_DMA; 3104 tf->hob_feature = 0; 3105 tf->feature = ATA_DSM_TRIM; 3106 tf->hob_nsect = (size / 512) >> 8; 3107 tf->nsect = size / 512; 3108 tf->command = ATA_CMD_DSM; 3109 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3110 ATA_TFLAG_WRITE; 3111 3112 ata_qc_set_pc_nbytes(qc); 3113 3114 return 0; 3115 3116 invalid_fld: 3117 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3118 /* "Invalid field in cdb" */ 3119 return 1; 3120 } 3121 3122 /** 3123 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3124 * @qc: Storage for translated ATA taskfile 3125 * @buf: input buffer 3126 * @len: number of valid bytes in the input buffer 3127 * 3128 * Prepare a taskfile to modify caching information for the device. 3129 * 3130 * LOCKING: 3131 * None. 3132 */ 3133 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3134 const u8 *buf, int len) 3135 { 3136 struct ata_taskfile *tf = &qc->tf; 3137 struct ata_device *dev = qc->dev; 3138 char mpage[CACHE_MPAGE_LEN]; 3139 u8 wce; 3140 3141 /* 3142 * The first two bytes of def_cache_mpage are a header, so offsets 3143 * in mpage are off by 2 compared to buf. Same for len. 3144 */ 3145 3146 if (len != CACHE_MPAGE_LEN - 2) 3147 return -EINVAL; 3148 3149 wce = buf[0] & (1 << 2); 3150 3151 /* 3152 * Check that read-only bits are not modified. 3153 */ 3154 ata_msense_caching(dev->id, mpage, false); 3155 mpage[2] &= ~(1 << 2); 3156 mpage[2] |= wce; 3157 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3158 return -EINVAL; 3159 3160 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3161 tf->protocol = ATA_PROT_NODATA; 3162 tf->nsect = 0; 3163 tf->command = ATA_CMD_SET_FEATURES; 3164 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3165 return 0; 3166 } 3167 3168 /** 3169 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3170 * @qc: Storage for translated ATA taskfile 3171 * 3172 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3173 * Assume this is invoked for direct access devices (e.g. disks) only. 3174 * There should be no block descriptor for other device types. 3175 * 3176 * LOCKING: 3177 * spin_lock_irqsave(host lock) 3178 */ 3179 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3180 { 3181 struct scsi_cmnd *scmd = qc->scsicmd; 3182 const u8 *cdb = scmd->cmnd; 3183 const u8 *p; 3184 u8 pg, spg; 3185 unsigned six_byte, pg_len, hdr_len, bd_len; 3186 int len; 3187 3188 VPRINTK("ENTER\n"); 3189 3190 six_byte = (cdb[0] == MODE_SELECT); 3191 if (six_byte) { 3192 if (scmd->cmd_len < 5) 3193 goto invalid_fld; 3194 3195 len = cdb[4]; 3196 hdr_len = 4; 3197 } else { 3198 if (scmd->cmd_len < 9) 3199 goto invalid_fld; 3200 3201 len = (cdb[7] << 8) + cdb[8]; 3202 hdr_len = 8; 3203 } 3204 3205 /* We only support PF=1, SP=0. */ 3206 if ((cdb[1] & 0x11) != 0x10) 3207 goto invalid_fld; 3208 3209 /* Test early for possible overrun. */ 3210 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3211 goto invalid_param_len; 3212 3213 p = page_address(sg_page(scsi_sglist(scmd))); 3214 3215 /* Move past header and block descriptors. */ 3216 if (len < hdr_len) 3217 goto invalid_param_len; 3218 3219 if (six_byte) 3220 bd_len = p[3]; 3221 else 3222 bd_len = (p[6] << 8) + p[7]; 3223 3224 len -= hdr_len; 3225 p += hdr_len; 3226 if (len < bd_len) 3227 goto invalid_param_len; 3228 if (bd_len != 0 && bd_len != 8) 3229 goto invalid_param; 3230 3231 len -= bd_len; 3232 p += bd_len; 3233 if (len == 0) 3234 goto skip; 3235 3236 /* Parse both possible formats for the mode page headers. */ 3237 pg = p[0] & 0x3f; 3238 if (p[0] & 0x40) { 3239 if (len < 4) 3240 goto invalid_param_len; 3241 3242 spg = p[1]; 3243 pg_len = (p[2] << 8) | p[3]; 3244 p += 4; 3245 len -= 4; 3246 } else { 3247 if (len < 2) 3248 goto invalid_param_len; 3249 3250 spg = 0; 3251 pg_len = p[1]; 3252 p += 2; 3253 len -= 2; 3254 } 3255 3256 /* 3257 * No mode subpages supported (yet) but asking for _all_ 3258 * subpages may be valid 3259 */ 3260 if (spg && (spg != ALL_SUB_MPAGES)) 3261 goto invalid_param; 3262 if (pg_len > len) 3263 goto invalid_param_len; 3264 3265 switch (pg) { 3266 case CACHE_MPAGE: 3267 if (ata_mselect_caching(qc, p, pg_len) < 0) 3268 goto invalid_param; 3269 break; 3270 3271 default: /* invalid page code */ 3272 goto invalid_param; 3273 } 3274 3275 /* 3276 * Only one page has changeable data, so we only support setting one 3277 * page at a time. 3278 */ 3279 if (len > pg_len) 3280 goto invalid_param; 3281 3282 return 0; 3283 3284 invalid_fld: 3285 /* "Invalid field in CDB" */ 3286 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3287 return 1; 3288 3289 invalid_param: 3290 /* "Invalid field in parameter list" */ 3291 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3292 return 1; 3293 3294 invalid_param_len: 3295 /* "Parameter list length error" */ 3296 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3297 return 1; 3298 3299 skip: 3300 scmd->result = SAM_STAT_GOOD; 3301 return 1; 3302 } 3303 3304 /** 3305 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3306 * @dev: ATA device 3307 * @cmd: SCSI command opcode to consider 3308 * 3309 * Look up the SCSI command given, and determine whether the 3310 * SCSI command is to be translated or simulated. 3311 * 3312 * RETURNS: 3313 * Pointer to translation function if possible, %NULL if not. 3314 */ 3315 3316 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3317 { 3318 switch (cmd) { 3319 case READ_6: 3320 case READ_10: 3321 case READ_16: 3322 3323 case WRITE_6: 3324 case WRITE_10: 3325 case WRITE_16: 3326 return ata_scsi_rw_xlat; 3327 3328 case WRITE_SAME_16: 3329 return ata_scsi_write_same_xlat; 3330 3331 case SYNCHRONIZE_CACHE: 3332 if (ata_try_flush_cache(dev)) 3333 return ata_scsi_flush_xlat; 3334 break; 3335 3336 case VERIFY: 3337 case VERIFY_16: 3338 return ata_scsi_verify_xlat; 3339 3340 case ATA_12: 3341 case ATA_16: 3342 return ata_scsi_pass_thru; 3343 3344 case MODE_SELECT: 3345 case MODE_SELECT_10: 3346 return ata_scsi_mode_select_xlat; 3347 break; 3348 3349 case START_STOP: 3350 return ata_scsi_start_stop_xlat; 3351 } 3352 3353 return NULL; 3354 } 3355 3356 /** 3357 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3358 * @ap: ATA port to which the command was being sent 3359 * @cmd: SCSI command to dump 3360 * 3361 * Prints the contents of a SCSI command via printk(). 3362 */ 3363 3364 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3365 struct scsi_cmnd *cmd) 3366 { 3367 #ifdef ATA_DEBUG 3368 struct scsi_device *scsidev = cmd->device; 3369 u8 *scsicmd = cmd->cmnd; 3370 3371 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3372 ap->print_id, 3373 scsidev->channel, scsidev->id, scsidev->lun, 3374 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3375 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3376 scsicmd[8]); 3377 #endif 3378 } 3379 3380 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3381 struct ata_device *dev) 3382 { 3383 u8 scsi_op = scmd->cmnd[0]; 3384 ata_xlat_func_t xlat_func; 3385 int rc = 0; 3386 3387 if (dev->class == ATA_DEV_ATA) { 3388 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3389 goto bad_cdb_len; 3390 3391 xlat_func = ata_get_xlat_func(dev, scsi_op); 3392 } else { 3393 if (unlikely(!scmd->cmd_len)) 3394 goto bad_cdb_len; 3395 3396 xlat_func = NULL; 3397 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3398 /* relay SCSI command to ATAPI device */ 3399 int len = COMMAND_SIZE(scsi_op); 3400 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3401 goto bad_cdb_len; 3402 3403 xlat_func = atapi_xlat; 3404 } else { 3405 /* ATA_16 passthru, treat as an ATA command */ 3406 if (unlikely(scmd->cmd_len > 16)) 3407 goto bad_cdb_len; 3408 3409 xlat_func = ata_get_xlat_func(dev, scsi_op); 3410 } 3411 } 3412 3413 if (xlat_func) 3414 rc = ata_scsi_translate(dev, scmd, xlat_func); 3415 else 3416 ata_scsi_simulate(dev, scmd); 3417 3418 return rc; 3419 3420 bad_cdb_len: 3421 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3422 scmd->cmd_len, scsi_op, dev->cdb_len); 3423 scmd->result = DID_ERROR << 16; 3424 scmd->scsi_done(scmd); 3425 return 0; 3426 } 3427 3428 /** 3429 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3430 * @shost: SCSI host of command to be sent 3431 * @cmd: SCSI command to be sent 3432 * 3433 * In some cases, this function translates SCSI commands into 3434 * ATA taskfiles, and queues the taskfiles to be sent to 3435 * hardware. In other cases, this function simulates a 3436 * SCSI device by evaluating and responding to certain 3437 * SCSI commands. This creates the overall effect of 3438 * ATA and ATAPI devices appearing as SCSI devices. 3439 * 3440 * LOCKING: 3441 * ATA host lock 3442 * 3443 * RETURNS: 3444 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3445 * 0 otherwise. 3446 */ 3447 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3448 { 3449 struct ata_port *ap; 3450 struct ata_device *dev; 3451 struct scsi_device *scsidev = cmd->device; 3452 int rc = 0; 3453 unsigned long irq_flags; 3454 3455 ap = ata_shost_to_port(shost); 3456 3457 spin_lock_irqsave(ap->lock, irq_flags); 3458 3459 ata_scsi_dump_cdb(ap, cmd); 3460 3461 dev = ata_scsi_find_dev(ap, scsidev); 3462 if (likely(dev)) 3463 rc = __ata_scsi_queuecmd(cmd, dev); 3464 else { 3465 cmd->result = (DID_BAD_TARGET << 16); 3466 cmd->scsi_done(cmd); 3467 } 3468 3469 spin_unlock_irqrestore(ap->lock, irq_flags); 3470 3471 return rc; 3472 } 3473 3474 /** 3475 * ata_scsi_simulate - simulate SCSI command on ATA device 3476 * @dev: the target device 3477 * @cmd: SCSI command being sent to device. 3478 * 3479 * Interprets and directly executes a select list of SCSI commands 3480 * that can be handled internally. 3481 * 3482 * LOCKING: 3483 * spin_lock_irqsave(host lock) 3484 */ 3485 3486 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3487 { 3488 struct ata_scsi_args args; 3489 const u8 *scsicmd = cmd->cmnd; 3490 u8 tmp8; 3491 3492 args.dev = dev; 3493 args.id = dev->id; 3494 args.cmd = cmd; 3495 args.done = cmd->scsi_done; 3496 3497 switch(scsicmd[0]) { 3498 /* TODO: worth improving? */ 3499 case FORMAT_UNIT: 3500 ata_scsi_invalid_field(cmd); 3501 break; 3502 3503 case INQUIRY: 3504 if (scsicmd[1] & 2) /* is CmdDt set? */ 3505 ata_scsi_invalid_field(cmd); 3506 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3507 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3508 else switch (scsicmd[2]) { 3509 case 0x00: 3510 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3511 break; 3512 case 0x80: 3513 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3514 break; 3515 case 0x83: 3516 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3517 break; 3518 case 0x89: 3519 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3520 break; 3521 case 0xb0: 3522 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3523 break; 3524 case 0xb1: 3525 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3526 break; 3527 case 0xb2: 3528 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3529 break; 3530 default: 3531 ata_scsi_invalid_field(cmd); 3532 break; 3533 } 3534 break; 3535 3536 case MODE_SENSE: 3537 case MODE_SENSE_10: 3538 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3539 break; 3540 3541 case READ_CAPACITY: 3542 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3543 break; 3544 3545 case SERVICE_ACTION_IN: 3546 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3547 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3548 else 3549 ata_scsi_invalid_field(cmd); 3550 break; 3551 3552 case REPORT_LUNS: 3553 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3554 break; 3555 3556 case REQUEST_SENSE: 3557 ata_scsi_set_sense(cmd, 0, 0, 0); 3558 cmd->result = (DRIVER_SENSE << 24); 3559 cmd->scsi_done(cmd); 3560 break; 3561 3562 /* if we reach this, then writeback caching is disabled, 3563 * turning this into a no-op. 3564 */ 3565 case SYNCHRONIZE_CACHE: 3566 /* fall through */ 3567 3568 /* no-op's, complete with success */ 3569 case REZERO_UNIT: 3570 case SEEK_6: 3571 case SEEK_10: 3572 case TEST_UNIT_READY: 3573 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3574 break; 3575 3576 case SEND_DIAGNOSTIC: 3577 tmp8 = scsicmd[1] & ~(1 << 3); 3578 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3579 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3580 else 3581 ata_scsi_invalid_field(cmd); 3582 break; 3583 3584 /* all other commands */ 3585 default: 3586 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3587 /* "Invalid command operation code" */ 3588 cmd->scsi_done(cmd); 3589 break; 3590 } 3591 } 3592 3593 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3594 { 3595 int i, rc; 3596 3597 for (i = 0; i < host->n_ports; i++) { 3598 struct ata_port *ap = host->ports[i]; 3599 struct Scsi_Host *shost; 3600 3601 rc = -ENOMEM; 3602 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3603 if (!shost) 3604 goto err_alloc; 3605 3606 shost->eh_noresume = 1; 3607 *(struct ata_port **)&shost->hostdata[0] = ap; 3608 ap->scsi_host = shost; 3609 3610 shost->transportt = ata_scsi_transport_template; 3611 shost->unique_id = ap->print_id; 3612 shost->max_id = 16; 3613 shost->max_lun = 1; 3614 shost->max_channel = 1; 3615 shost->max_cmd_len = 16; 3616 3617 /* Schedule policy is determined by ->qc_defer() 3618 * callback and it needs to see every deferred qc. 3619 * Set host_blocked to 1 to prevent SCSI midlayer from 3620 * automatically deferring requests. 3621 */ 3622 shost->max_host_blocked = 1; 3623 3624 rc = scsi_add_host_with_dma(ap->scsi_host, 3625 &ap->tdev, ap->host->dev); 3626 if (rc) 3627 goto err_add; 3628 } 3629 3630 return 0; 3631 3632 err_add: 3633 scsi_host_put(host->ports[i]->scsi_host); 3634 err_alloc: 3635 while (--i >= 0) { 3636 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3637 3638 scsi_remove_host(shost); 3639 scsi_host_put(shost); 3640 } 3641 return rc; 3642 } 3643 3644 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3645 { 3646 int tries = 5; 3647 struct ata_device *last_failed_dev = NULL; 3648 struct ata_link *link; 3649 struct ata_device *dev; 3650 3651 repeat: 3652 ata_for_each_link(link, ap, EDGE) { 3653 ata_for_each_dev(dev, link, ENABLED) { 3654 struct scsi_device *sdev; 3655 int channel = 0, id = 0; 3656 3657 if (dev->sdev) 3658 continue; 3659 3660 if (ata_is_host_link(link)) 3661 id = dev->devno; 3662 else 3663 channel = link->pmp; 3664 3665 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3666 NULL); 3667 if (!IS_ERR(sdev)) { 3668 dev->sdev = sdev; 3669 scsi_device_put(sdev); 3670 if (zpodd_dev_enabled(dev)) 3671 dev_pm_qos_expose_flags( 3672 &sdev->sdev_gendev, 0); 3673 } else { 3674 dev->sdev = NULL; 3675 } 3676 } 3677 } 3678 3679 /* If we scanned while EH was in progress or allocation 3680 * failure occurred, scan would have failed silently. Check 3681 * whether all devices are attached. 3682 */ 3683 ata_for_each_link(link, ap, EDGE) { 3684 ata_for_each_dev(dev, link, ENABLED) { 3685 if (!dev->sdev) 3686 goto exit_loop; 3687 } 3688 } 3689 exit_loop: 3690 if (!link) 3691 return; 3692 3693 /* we're missing some SCSI devices */ 3694 if (sync) { 3695 /* If caller requested synchrnous scan && we've made 3696 * any progress, sleep briefly and repeat. 3697 */ 3698 if (dev != last_failed_dev) { 3699 msleep(100); 3700 last_failed_dev = dev; 3701 goto repeat; 3702 } 3703 3704 /* We might be failing to detect boot device, give it 3705 * a few more chances. 3706 */ 3707 if (--tries) { 3708 msleep(100); 3709 goto repeat; 3710 } 3711 3712 ata_port_err(ap, 3713 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3714 } 3715 3716 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3717 round_jiffies_relative(HZ)); 3718 } 3719 3720 /** 3721 * ata_scsi_offline_dev - offline attached SCSI device 3722 * @dev: ATA device to offline attached SCSI device for 3723 * 3724 * This function is called from ata_eh_hotplug() and responsible 3725 * for taking the SCSI device attached to @dev offline. This 3726 * function is called with host lock which protects dev->sdev 3727 * against clearing. 3728 * 3729 * LOCKING: 3730 * spin_lock_irqsave(host lock) 3731 * 3732 * RETURNS: 3733 * 1 if attached SCSI device exists, 0 otherwise. 3734 */ 3735 int ata_scsi_offline_dev(struct ata_device *dev) 3736 { 3737 if (dev->sdev) { 3738 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3739 return 1; 3740 } 3741 return 0; 3742 } 3743 3744 /** 3745 * ata_scsi_remove_dev - remove attached SCSI device 3746 * @dev: ATA device to remove attached SCSI device for 3747 * 3748 * This function is called from ata_eh_scsi_hotplug() and 3749 * responsible for removing the SCSI device attached to @dev. 3750 * 3751 * LOCKING: 3752 * Kernel thread context (may sleep). 3753 */ 3754 static void ata_scsi_remove_dev(struct ata_device *dev) 3755 { 3756 struct ata_port *ap = dev->link->ap; 3757 struct scsi_device *sdev; 3758 unsigned long flags; 3759 3760 /* Alas, we need to grab scan_mutex to ensure SCSI device 3761 * state doesn't change underneath us and thus 3762 * scsi_device_get() always succeeds. The mutex locking can 3763 * be removed if there is __scsi_device_get() interface which 3764 * increments reference counts regardless of device state. 3765 */ 3766 mutex_lock(&ap->scsi_host->scan_mutex); 3767 spin_lock_irqsave(ap->lock, flags); 3768 3769 if (zpodd_dev_enabled(dev)) 3770 zpodd_exit(dev); 3771 3772 /* clearing dev->sdev is protected by host lock */ 3773 sdev = dev->sdev; 3774 dev->sdev = NULL; 3775 3776 if (sdev) { 3777 /* If user initiated unplug races with us, sdev can go 3778 * away underneath us after the host lock and 3779 * scan_mutex are released. Hold onto it. 3780 */ 3781 if (scsi_device_get(sdev) == 0) { 3782 /* The following ensures the attached sdev is 3783 * offline on return from ata_scsi_offline_dev() 3784 * regardless it wins or loses the race 3785 * against this function. 3786 */ 3787 scsi_device_set_state(sdev, SDEV_OFFLINE); 3788 } else { 3789 WARN_ON(1); 3790 sdev = NULL; 3791 } 3792 } 3793 3794 spin_unlock_irqrestore(ap->lock, flags); 3795 mutex_unlock(&ap->scsi_host->scan_mutex); 3796 3797 if (sdev) { 3798 ata_dev_info(dev, "detaching (SCSI %s)\n", 3799 dev_name(&sdev->sdev_gendev)); 3800 3801 scsi_remove_device(sdev); 3802 scsi_device_put(sdev); 3803 } 3804 } 3805 3806 static void ata_scsi_handle_link_detach(struct ata_link *link) 3807 { 3808 struct ata_port *ap = link->ap; 3809 struct ata_device *dev; 3810 3811 ata_for_each_dev(dev, link, ALL) { 3812 unsigned long flags; 3813 3814 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3815 continue; 3816 3817 spin_lock_irqsave(ap->lock, flags); 3818 dev->flags &= ~ATA_DFLAG_DETACHED; 3819 spin_unlock_irqrestore(ap->lock, flags); 3820 3821 ata_scsi_remove_dev(dev); 3822 } 3823 } 3824 3825 /** 3826 * ata_scsi_media_change_notify - send media change event 3827 * @dev: Pointer to the disk device with media change event 3828 * 3829 * Tell the block layer to send a media change notification 3830 * event. 3831 * 3832 * LOCKING: 3833 * spin_lock_irqsave(host lock) 3834 */ 3835 void ata_scsi_media_change_notify(struct ata_device *dev) 3836 { 3837 if (dev->sdev) 3838 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3839 GFP_ATOMIC); 3840 } 3841 3842 /** 3843 * ata_scsi_hotplug - SCSI part of hotplug 3844 * @work: Pointer to ATA port to perform SCSI hotplug on 3845 * 3846 * Perform SCSI part of hotplug. It's executed from a separate 3847 * workqueue after EH completes. This is necessary because SCSI 3848 * hot plugging requires working EH and hot unplugging is 3849 * synchronized with hot plugging with a mutex. 3850 * 3851 * LOCKING: 3852 * Kernel thread context (may sleep). 3853 */ 3854 void ata_scsi_hotplug(struct work_struct *work) 3855 { 3856 struct ata_port *ap = 3857 container_of(work, struct ata_port, hotplug_task.work); 3858 int i; 3859 3860 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3861 DPRINTK("ENTER/EXIT - unloading\n"); 3862 return; 3863 } 3864 3865 DPRINTK("ENTER\n"); 3866 mutex_lock(&ap->scsi_scan_mutex); 3867 3868 /* Unplug detached devices. We cannot use link iterator here 3869 * because PMP links have to be scanned even if PMP is 3870 * currently not attached. Iterate manually. 3871 */ 3872 ata_scsi_handle_link_detach(&ap->link); 3873 if (ap->pmp_link) 3874 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3875 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3876 3877 /* scan for new ones */ 3878 ata_scsi_scan_host(ap, 0); 3879 3880 mutex_unlock(&ap->scsi_scan_mutex); 3881 DPRINTK("EXIT\n"); 3882 } 3883 3884 /** 3885 * ata_scsi_user_scan - indication for user-initiated bus scan 3886 * @shost: SCSI host to scan 3887 * @channel: Channel to scan 3888 * @id: ID to scan 3889 * @lun: LUN to scan 3890 * 3891 * This function is called when user explicitly requests bus 3892 * scan. Set probe pending flag and invoke EH. 3893 * 3894 * LOCKING: 3895 * SCSI layer (we don't care) 3896 * 3897 * RETURNS: 3898 * Zero. 3899 */ 3900 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3901 unsigned int id, unsigned int lun) 3902 { 3903 struct ata_port *ap = ata_shost_to_port(shost); 3904 unsigned long flags; 3905 int devno, rc = 0; 3906 3907 if (!ap->ops->error_handler) 3908 return -EOPNOTSUPP; 3909 3910 if (lun != SCAN_WILD_CARD && lun) 3911 return -EINVAL; 3912 3913 if (!sata_pmp_attached(ap)) { 3914 if (channel != SCAN_WILD_CARD && channel) 3915 return -EINVAL; 3916 devno = id; 3917 } else { 3918 if (id != SCAN_WILD_CARD && id) 3919 return -EINVAL; 3920 devno = channel; 3921 } 3922 3923 spin_lock_irqsave(ap->lock, flags); 3924 3925 if (devno == SCAN_WILD_CARD) { 3926 struct ata_link *link; 3927 3928 ata_for_each_link(link, ap, EDGE) { 3929 struct ata_eh_info *ehi = &link->eh_info; 3930 ehi->probe_mask |= ATA_ALL_DEVICES; 3931 ehi->action |= ATA_EH_RESET; 3932 } 3933 } else { 3934 struct ata_device *dev = ata_find_dev(ap, devno); 3935 3936 if (dev) { 3937 struct ata_eh_info *ehi = &dev->link->eh_info; 3938 ehi->probe_mask |= 1 << dev->devno; 3939 ehi->action |= ATA_EH_RESET; 3940 } else 3941 rc = -EINVAL; 3942 } 3943 3944 if (rc == 0) { 3945 ata_port_schedule_eh(ap); 3946 spin_unlock_irqrestore(ap->lock, flags); 3947 ata_port_wait_eh(ap); 3948 } else 3949 spin_unlock_irqrestore(ap->lock, flags); 3950 3951 return rc; 3952 } 3953 3954 /** 3955 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3956 * @work: Pointer to ATA port to perform scsi_rescan_device() 3957 * 3958 * After ATA pass thru (SAT) commands are executed successfully, 3959 * libata need to propagate the changes to SCSI layer. 3960 * 3961 * LOCKING: 3962 * Kernel thread context (may sleep). 3963 */ 3964 void ata_scsi_dev_rescan(struct work_struct *work) 3965 { 3966 struct ata_port *ap = 3967 container_of(work, struct ata_port, scsi_rescan_task); 3968 struct ata_link *link; 3969 struct ata_device *dev; 3970 unsigned long flags; 3971 3972 mutex_lock(&ap->scsi_scan_mutex); 3973 spin_lock_irqsave(ap->lock, flags); 3974 3975 ata_for_each_link(link, ap, EDGE) { 3976 ata_for_each_dev(dev, link, ENABLED) { 3977 struct scsi_device *sdev = dev->sdev; 3978 3979 if (!sdev) 3980 continue; 3981 if (scsi_device_get(sdev)) 3982 continue; 3983 3984 spin_unlock_irqrestore(ap->lock, flags); 3985 scsi_rescan_device(&(sdev->sdev_gendev)); 3986 scsi_device_put(sdev); 3987 spin_lock_irqsave(ap->lock, flags); 3988 } 3989 } 3990 3991 spin_unlock_irqrestore(ap->lock, flags); 3992 mutex_unlock(&ap->scsi_scan_mutex); 3993 } 3994 3995 /** 3996 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3997 * @host: ATA host container for all SAS ports 3998 * @port_info: Information from low-level host driver 3999 * @shost: SCSI host that the scsi device is attached to 4000 * 4001 * LOCKING: 4002 * PCI/etc. bus probe sem. 4003 * 4004 * RETURNS: 4005 * ata_port pointer on success / NULL on failure. 4006 */ 4007 4008 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4009 struct ata_port_info *port_info, 4010 struct Scsi_Host *shost) 4011 { 4012 struct ata_port *ap; 4013 4014 ap = ata_port_alloc(host); 4015 if (!ap) 4016 return NULL; 4017 4018 ap->port_no = 0; 4019 ap->lock = &host->lock; 4020 ap->pio_mask = port_info->pio_mask; 4021 ap->mwdma_mask = port_info->mwdma_mask; 4022 ap->udma_mask = port_info->udma_mask; 4023 ap->flags |= port_info->flags; 4024 ap->ops = port_info->port_ops; 4025 ap->cbl = ATA_CBL_SATA; 4026 4027 return ap; 4028 } 4029 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4030 4031 /** 4032 * ata_sas_port_start - Set port up for dma. 4033 * @ap: Port to initialize 4034 * 4035 * Called just after data structures for each port are 4036 * initialized. 4037 * 4038 * May be used as the port_start() entry in ata_port_operations. 4039 * 4040 * LOCKING: 4041 * Inherited from caller. 4042 */ 4043 int ata_sas_port_start(struct ata_port *ap) 4044 { 4045 /* 4046 * the port is marked as frozen at allocation time, but if we don't 4047 * have new eh, we won't thaw it 4048 */ 4049 if (!ap->ops->error_handler) 4050 ap->pflags &= ~ATA_PFLAG_FROZEN; 4051 return 0; 4052 } 4053 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4054 4055 /** 4056 * ata_port_stop - Undo ata_sas_port_start() 4057 * @ap: Port to shut down 4058 * 4059 * May be used as the port_stop() entry in ata_port_operations. 4060 * 4061 * LOCKING: 4062 * Inherited from caller. 4063 */ 4064 4065 void ata_sas_port_stop(struct ata_port *ap) 4066 { 4067 } 4068 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4069 4070 /** 4071 * ata_sas_async_probe - simply schedule probing and return 4072 * @ap: Port to probe 4073 * 4074 * For batch scheduling of probe for sas attached ata devices, assumes 4075 * the port has already been through ata_sas_port_init() 4076 */ 4077 void ata_sas_async_probe(struct ata_port *ap) 4078 { 4079 __ata_port_probe(ap); 4080 } 4081 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4082 4083 int ata_sas_sync_probe(struct ata_port *ap) 4084 { 4085 return ata_port_probe(ap); 4086 } 4087 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4088 4089 4090 /** 4091 * ata_sas_port_init - Initialize a SATA device 4092 * @ap: SATA port to initialize 4093 * 4094 * LOCKING: 4095 * PCI/etc. bus probe sem. 4096 * 4097 * RETURNS: 4098 * Zero on success, non-zero on error. 4099 */ 4100 4101 int ata_sas_port_init(struct ata_port *ap) 4102 { 4103 int rc = ap->ops->port_start(ap); 4104 4105 if (rc) 4106 return rc; 4107 ap->print_id = atomic_inc_return(&ata_print_id); 4108 return 0; 4109 } 4110 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4111 4112 /** 4113 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4114 * @ap: SATA port to destroy 4115 * 4116 */ 4117 4118 void ata_sas_port_destroy(struct ata_port *ap) 4119 { 4120 if (ap->ops->port_stop) 4121 ap->ops->port_stop(ap); 4122 kfree(ap); 4123 } 4124 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4125 4126 /** 4127 * ata_sas_slave_configure - Default slave_config routine for libata devices 4128 * @sdev: SCSI device to configure 4129 * @ap: ATA port to which SCSI device is attached 4130 * 4131 * RETURNS: 4132 * Zero. 4133 */ 4134 4135 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4136 { 4137 ata_scsi_sdev_config(sdev); 4138 ata_scsi_dev_config(sdev, ap->link.device); 4139 return 0; 4140 } 4141 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4142 4143 /** 4144 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4145 * @cmd: SCSI command to be sent 4146 * @ap: ATA port to which the command is being sent 4147 * 4148 * RETURNS: 4149 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4150 * 0 otherwise. 4151 */ 4152 4153 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4154 { 4155 int rc = 0; 4156 4157 ata_scsi_dump_cdb(ap, cmd); 4158 4159 if (likely(ata_dev_enabled(ap->link.device))) 4160 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4161 else { 4162 cmd->result = (DID_BAD_TARGET << 16); 4163 cmd->scsi_done(cmd); 4164 } 4165 return rc; 4166 } 4167 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4168