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 <asm/unaligned.h> 53 54 #include "libata.h" 55 #include "libata-transport.h" 56 57 #define ATA_SCSI_RBUF_SIZE 4096 58 59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 61 62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 63 64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 65 const struct scsi_device *scsidev); 66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 67 const struct scsi_device *scsidev); 68 69 #define RW_RECOVERY_MPAGE 0x1 70 #define RW_RECOVERY_MPAGE_LEN 12 71 #define CACHE_MPAGE 0x8 72 #define CACHE_MPAGE_LEN 20 73 #define CONTROL_MPAGE 0xa 74 #define CONTROL_MPAGE_LEN 12 75 #define ALL_MPAGES 0x3f 76 #define ALL_SUB_MPAGES 0xff 77 78 79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 80 RW_RECOVERY_MPAGE, 81 RW_RECOVERY_MPAGE_LEN - 2, 82 (1 << 7), /* AWRE */ 83 0, /* read retry count */ 84 0, 0, 0, 0, 85 0, /* write retry count */ 86 0, 0, 0 87 }; 88 89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 90 CACHE_MPAGE, 91 CACHE_MPAGE_LEN - 2, 92 0, /* contains WCE, needs to be 0 for logic */ 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 94 0, /* contains DRA, needs to be 0 for logic */ 95 0, 0, 0, 0, 0, 0, 0 96 }; 97 98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 99 CONTROL_MPAGE, 100 CONTROL_MPAGE_LEN - 2, 101 2, /* DSENSE=0, GLTSD=1 */ 102 0, /* [QAM+QERR may be 1, see 05-359r1] */ 103 0, 0, 0, 0, 0xff, 0xff, 104 0, 30 /* extended self test time, see 05-359r1 */ 105 }; 106 107 static const char *ata_lpm_policy_names[] = { 108 [ATA_LPM_UNKNOWN] = "max_performance", 109 [ATA_LPM_MAX_POWER] = "max_performance", 110 [ATA_LPM_MED_POWER] = "medium_power", 111 [ATA_LPM_MIN_POWER] = "min_power", 112 }; 113 114 static ssize_t ata_scsi_lpm_store(struct device *dev, 115 struct device_attribute *attr, 116 const char *buf, size_t count) 117 { 118 struct Scsi_Host *shost = class_to_shost(dev); 119 struct ata_port *ap = ata_shost_to_port(shost); 120 enum ata_lpm_policy policy; 121 unsigned long flags; 122 123 /* UNKNOWN is internal state, iterate from MAX_POWER */ 124 for (policy = ATA_LPM_MAX_POWER; 125 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 126 const char *name = ata_lpm_policy_names[policy]; 127 128 if (strncmp(name, buf, strlen(name)) == 0) 129 break; 130 } 131 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 132 return -EINVAL; 133 134 spin_lock_irqsave(ap->lock, flags); 135 ap->target_lpm_policy = policy; 136 ata_port_schedule_eh(ap); 137 spin_unlock_irqrestore(ap->lock, flags); 138 139 return count; 140 } 141 142 static ssize_t ata_scsi_lpm_show(struct device *dev, 143 struct device_attribute *attr, char *buf) 144 { 145 struct Scsi_Host *shost = class_to_shost(dev); 146 struct ata_port *ap = ata_shost_to_port(shost); 147 148 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 149 return -EINVAL; 150 151 return snprintf(buf, PAGE_SIZE, "%s\n", 152 ata_lpm_policy_names[ap->target_lpm_policy]); 153 } 154 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 155 ata_scsi_lpm_show, ata_scsi_lpm_store); 156 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 157 158 static ssize_t ata_scsi_park_show(struct device *device, 159 struct device_attribute *attr, char *buf) 160 { 161 struct scsi_device *sdev = to_scsi_device(device); 162 struct ata_port *ap; 163 struct ata_link *link; 164 struct ata_device *dev; 165 unsigned long flags, now; 166 unsigned int uninitialized_var(msecs); 167 int rc = 0; 168 169 ap = ata_shost_to_port(sdev->host); 170 171 spin_lock_irqsave(ap->lock, flags); 172 dev = ata_scsi_find_dev(ap, sdev); 173 if (!dev) { 174 rc = -ENODEV; 175 goto unlock; 176 } 177 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 178 rc = -EOPNOTSUPP; 179 goto unlock; 180 } 181 182 link = dev->link; 183 now = jiffies; 184 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 185 link->eh_context.unloaded_mask & (1 << dev->devno) && 186 time_after(dev->unpark_deadline, now)) 187 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 188 else 189 msecs = 0; 190 191 unlock: 192 spin_unlock_irq(ap->lock); 193 194 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 195 } 196 197 static ssize_t ata_scsi_park_store(struct device *device, 198 struct device_attribute *attr, 199 const char *buf, size_t len) 200 { 201 struct scsi_device *sdev = to_scsi_device(device); 202 struct ata_port *ap; 203 struct ata_device *dev; 204 long int input; 205 unsigned long flags; 206 int rc; 207 208 rc = kstrtol(buf, 10, &input); 209 if (rc) 210 return rc; 211 if (input < -2) 212 return -EINVAL; 213 if (input > ATA_TMOUT_MAX_PARK) { 214 rc = -EOVERFLOW; 215 input = ATA_TMOUT_MAX_PARK; 216 } 217 218 ap = ata_shost_to_port(sdev->host); 219 220 spin_lock_irqsave(ap->lock, flags); 221 dev = ata_scsi_find_dev(ap, sdev); 222 if (unlikely(!dev)) { 223 rc = -ENODEV; 224 goto unlock; 225 } 226 if (dev->class != ATA_DEV_ATA) { 227 rc = -EOPNOTSUPP; 228 goto unlock; 229 } 230 231 if (input >= 0) { 232 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 233 rc = -EOPNOTSUPP; 234 goto unlock; 235 } 236 237 dev->unpark_deadline = ata_deadline(jiffies, input); 238 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 239 ata_port_schedule_eh(ap); 240 complete(&ap->park_req_pending); 241 } else { 242 switch (input) { 243 case -1: 244 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 245 break; 246 case -2: 247 dev->flags |= ATA_DFLAG_NO_UNLOAD; 248 break; 249 } 250 } 251 unlock: 252 spin_unlock_irqrestore(ap->lock, flags); 253 254 return rc ? rc : len; 255 } 256 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 257 ata_scsi_park_show, ata_scsi_park_store); 258 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 259 260 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 261 { 262 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 263 264 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 265 } 266 267 static ssize_t 268 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 269 const char *buf, size_t count) 270 { 271 struct Scsi_Host *shost = class_to_shost(dev); 272 struct ata_port *ap = ata_shost_to_port(shost); 273 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 274 return ap->ops->em_store(ap, buf, count); 275 return -EINVAL; 276 } 277 278 static ssize_t 279 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 280 char *buf) 281 { 282 struct Scsi_Host *shost = class_to_shost(dev); 283 struct ata_port *ap = ata_shost_to_port(shost); 284 285 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 286 return ap->ops->em_show(ap, buf); 287 return -EINVAL; 288 } 289 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 290 ata_scsi_em_message_show, ata_scsi_em_message_store); 291 EXPORT_SYMBOL_GPL(dev_attr_em_message); 292 293 static ssize_t 294 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 295 char *buf) 296 { 297 struct Scsi_Host *shost = class_to_shost(dev); 298 struct ata_port *ap = ata_shost_to_port(shost); 299 300 return snprintf(buf, 23, "%d\n", ap->em_message_type); 301 } 302 DEVICE_ATTR(em_message_type, S_IRUGO, 303 ata_scsi_em_message_type_show, NULL); 304 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 305 306 static ssize_t 307 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct scsi_device *sdev = to_scsi_device(dev); 311 struct ata_port *ap = ata_shost_to_port(sdev->host); 312 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 313 314 if (atadev && ap->ops->sw_activity_show && 315 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 316 return ap->ops->sw_activity_show(atadev, buf); 317 return -EINVAL; 318 } 319 320 static ssize_t 321 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 322 const char *buf, size_t count) 323 { 324 struct scsi_device *sdev = to_scsi_device(dev); 325 struct ata_port *ap = ata_shost_to_port(sdev->host); 326 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 327 enum sw_activity val; 328 int rc; 329 330 if (atadev && ap->ops->sw_activity_store && 331 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 332 val = simple_strtoul(buf, NULL, 0); 333 switch (val) { 334 case OFF: case BLINK_ON: case BLINK_OFF: 335 rc = ap->ops->sw_activity_store(atadev, val); 336 if (!rc) 337 return count; 338 else 339 return rc; 340 } 341 } 342 return -EINVAL; 343 } 344 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 345 ata_scsi_activity_store); 346 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 347 348 struct device_attribute *ata_common_sdev_attrs[] = { 349 &dev_attr_unload_heads, 350 NULL 351 }; 352 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 353 354 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 355 { 356 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 357 /* "Invalid field in cbd" */ 358 cmd->scsi_done(cmd); 359 } 360 361 /** 362 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 363 * @sdev: SCSI device for which BIOS geometry is to be determined 364 * @bdev: block device associated with @sdev 365 * @capacity: capacity of SCSI device 366 * @geom: location to which geometry will be output 367 * 368 * Generic bios head/sector/cylinder calculator 369 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 370 * mapping. Some situations may arise where the disk is not 371 * bootable if this is not used. 372 * 373 * LOCKING: 374 * Defined by the SCSI layer. We don't really care. 375 * 376 * RETURNS: 377 * Zero. 378 */ 379 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 380 sector_t capacity, int geom[]) 381 { 382 geom[0] = 255; 383 geom[1] = 63; 384 sector_div(capacity, 255*63); 385 geom[2] = capacity; 386 387 return 0; 388 } 389 390 /** 391 * ata_scsi_unlock_native_capacity - unlock native capacity 392 * @sdev: SCSI device to adjust device capacity for 393 * 394 * This function is called if a partition on @sdev extends beyond 395 * the end of the device. It requests EH to unlock HPA. 396 * 397 * LOCKING: 398 * Defined by the SCSI layer. Might sleep. 399 */ 400 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 401 { 402 struct ata_port *ap = ata_shost_to_port(sdev->host); 403 struct ata_device *dev; 404 unsigned long flags; 405 406 spin_lock_irqsave(ap->lock, flags); 407 408 dev = ata_scsi_find_dev(ap, sdev); 409 if (dev && dev->n_sectors < dev->n_native_sectors) { 410 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 411 dev->link->eh_info.action |= ATA_EH_RESET; 412 ata_port_schedule_eh(ap); 413 } 414 415 spin_unlock_irqrestore(ap->lock, flags); 416 ata_port_wait_eh(ap); 417 } 418 419 /** 420 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 421 * @ap: target port 422 * @sdev: SCSI device to get identify data for 423 * @arg: User buffer area for identify data 424 * 425 * LOCKING: 426 * Defined by the SCSI layer. We don't really care. 427 * 428 * RETURNS: 429 * Zero on success, negative errno on error. 430 */ 431 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 432 void __user *arg) 433 { 434 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 435 u16 __user *dst = arg; 436 char buf[40]; 437 438 if (!dev) 439 return -ENOMSG; 440 441 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 442 return -EFAULT; 443 444 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 445 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 446 return -EFAULT; 447 448 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 449 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 450 return -EFAULT; 451 452 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 453 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 454 return -EFAULT; 455 456 return 0; 457 } 458 459 /** 460 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 461 * @scsidev: Device to which we are issuing command 462 * @arg: User provided data for issuing command 463 * 464 * LOCKING: 465 * Defined by the SCSI layer. We don't really care. 466 * 467 * RETURNS: 468 * Zero on success, negative errno on error. 469 */ 470 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 471 { 472 int rc = 0; 473 u8 scsi_cmd[MAX_COMMAND_SIZE]; 474 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 475 int argsize = 0; 476 enum dma_data_direction data_dir; 477 int cmd_result; 478 479 if (arg == NULL) 480 return -EINVAL; 481 482 if (copy_from_user(args, arg, sizeof(args))) 483 return -EFAULT; 484 485 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 486 if (!sensebuf) 487 return -ENOMEM; 488 489 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 490 491 if (args[3]) { 492 argsize = ATA_SECT_SIZE * args[3]; 493 argbuf = kmalloc(argsize, GFP_KERNEL); 494 if (argbuf == NULL) { 495 rc = -ENOMEM; 496 goto error; 497 } 498 499 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 500 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 501 block count in sector count field */ 502 data_dir = DMA_FROM_DEVICE; 503 } else { 504 scsi_cmd[1] = (3 << 1); /* Non-data */ 505 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 506 data_dir = DMA_NONE; 507 } 508 509 scsi_cmd[0] = ATA_16; 510 511 scsi_cmd[4] = args[2]; 512 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 513 scsi_cmd[6] = args[3]; 514 scsi_cmd[8] = args[1]; 515 scsi_cmd[10] = 0x4f; 516 scsi_cmd[12] = 0xc2; 517 } else { 518 scsi_cmd[6] = args[1]; 519 } 520 scsi_cmd[14] = args[0]; 521 522 /* Good values for timeout and retries? Values below 523 from scsi_ioctl_send_command() for default case... */ 524 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 525 sensebuf, (10*HZ), 5, 0, NULL); 526 527 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 528 u8 *desc = sensebuf + 8; 529 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 530 531 /* If we set cc then ATA pass-through will cause a 532 * check condition even if no error. Filter that. */ 533 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 534 struct scsi_sense_hdr sshdr; 535 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 536 &sshdr); 537 if (sshdr.sense_key == RECOVERED_ERROR && 538 sshdr.asc == 0 && sshdr.ascq == 0x1d) 539 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 540 } 541 542 /* Send userspace a few ATA registers (same as drivers/ide) */ 543 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 544 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 545 args[0] = desc[13]; /* status */ 546 args[1] = desc[3]; /* error */ 547 args[2] = desc[5]; /* sector count (0:7) */ 548 if (copy_to_user(arg, args, sizeof(args))) 549 rc = -EFAULT; 550 } 551 } 552 553 554 if (cmd_result) { 555 rc = -EIO; 556 goto error; 557 } 558 559 if ((argbuf) 560 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 561 rc = -EFAULT; 562 error: 563 kfree(sensebuf); 564 kfree(argbuf); 565 return rc; 566 } 567 568 /** 569 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 570 * @scsidev: Device to which we are issuing command 571 * @arg: User provided data for issuing command 572 * 573 * LOCKING: 574 * Defined by the SCSI layer. We don't really care. 575 * 576 * RETURNS: 577 * Zero on success, negative errno on error. 578 */ 579 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 580 { 581 int rc = 0; 582 u8 scsi_cmd[MAX_COMMAND_SIZE]; 583 u8 args[7], *sensebuf = NULL; 584 int cmd_result; 585 586 if (arg == NULL) 587 return -EINVAL; 588 589 if (copy_from_user(args, arg, sizeof(args))) 590 return -EFAULT; 591 592 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 593 if (!sensebuf) 594 return -ENOMEM; 595 596 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 597 scsi_cmd[0] = ATA_16; 598 scsi_cmd[1] = (3 << 1); /* Non-data */ 599 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 600 scsi_cmd[4] = args[1]; 601 scsi_cmd[6] = args[2]; 602 scsi_cmd[8] = args[3]; 603 scsi_cmd[10] = args[4]; 604 scsi_cmd[12] = args[5]; 605 scsi_cmd[13] = args[6] & 0x4f; 606 scsi_cmd[14] = args[0]; 607 608 /* Good values for timeout and retries? Values below 609 from scsi_ioctl_send_command() for default case... */ 610 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 611 sensebuf, (10*HZ), 5, 0, NULL); 612 613 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 614 u8 *desc = sensebuf + 8; 615 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 616 617 /* If we set cc then ATA pass-through will cause a 618 * check condition even if no error. Filter that. */ 619 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 620 struct scsi_sense_hdr sshdr; 621 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 622 &sshdr); 623 if (sshdr.sense_key == RECOVERED_ERROR && 624 sshdr.asc == 0 && sshdr.ascq == 0x1d) 625 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 626 } 627 628 /* Send userspace ATA registers */ 629 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 630 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 631 args[0] = desc[13]; /* status */ 632 args[1] = desc[3]; /* error */ 633 args[2] = desc[5]; /* sector count (0:7) */ 634 args[3] = desc[7]; /* lbal */ 635 args[4] = desc[9]; /* lbam */ 636 args[5] = desc[11]; /* lbah */ 637 args[6] = desc[12]; /* select */ 638 if (copy_to_user(arg, args, sizeof(args))) 639 rc = -EFAULT; 640 } 641 } 642 643 if (cmd_result) { 644 rc = -EIO; 645 goto error; 646 } 647 648 error: 649 kfree(sensebuf); 650 return rc; 651 } 652 653 static int ata_ioc32(struct ata_port *ap) 654 { 655 if (ap->flags & ATA_FLAG_PIO_DMA) 656 return 1; 657 if (ap->pflags & ATA_PFLAG_PIO32) 658 return 1; 659 return 0; 660 } 661 662 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 663 int cmd, void __user *arg) 664 { 665 int val = -EINVAL, rc = -EINVAL; 666 unsigned long flags; 667 668 switch (cmd) { 669 case ATA_IOC_GET_IO32: 670 spin_lock_irqsave(ap->lock, flags); 671 val = ata_ioc32(ap); 672 spin_unlock_irqrestore(ap->lock, flags); 673 if (copy_to_user(arg, &val, 1)) 674 return -EFAULT; 675 return 0; 676 677 case ATA_IOC_SET_IO32: 678 val = (unsigned long) arg; 679 rc = 0; 680 spin_lock_irqsave(ap->lock, flags); 681 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 682 if (val) 683 ap->pflags |= ATA_PFLAG_PIO32; 684 else 685 ap->pflags &= ~ATA_PFLAG_PIO32; 686 } else { 687 if (val != ata_ioc32(ap)) 688 rc = -EINVAL; 689 } 690 spin_unlock_irqrestore(ap->lock, flags); 691 return rc; 692 693 case HDIO_GET_IDENTITY: 694 return ata_get_identity(ap, scsidev, arg); 695 696 case HDIO_DRIVE_CMD: 697 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 698 return -EACCES; 699 return ata_cmd_ioctl(scsidev, arg); 700 701 case HDIO_DRIVE_TASK: 702 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 703 return -EACCES; 704 return ata_task_ioctl(scsidev, arg); 705 706 default: 707 rc = -ENOTTY; 708 break; 709 } 710 711 return rc; 712 } 713 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 714 715 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 716 { 717 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 718 scsidev, cmd, arg); 719 } 720 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 721 722 /** 723 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 724 * @dev: ATA device to which the new command is attached 725 * @cmd: SCSI command that originated this ATA command 726 * 727 * Obtain a reference to an unused ata_queued_cmd structure, 728 * which is the basic libata structure representing a single 729 * ATA command sent to the hardware. 730 * 731 * If a command was available, fill in the SCSI-specific 732 * portions of the structure with information on the 733 * current command. 734 * 735 * LOCKING: 736 * spin_lock_irqsave(host lock) 737 * 738 * RETURNS: 739 * Command allocated, or %NULL if none available. 740 */ 741 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 742 struct scsi_cmnd *cmd) 743 { 744 struct ata_queued_cmd *qc; 745 746 qc = ata_qc_new_init(dev); 747 if (qc) { 748 qc->scsicmd = cmd; 749 qc->scsidone = cmd->scsi_done; 750 751 qc->sg = scsi_sglist(cmd); 752 qc->n_elem = scsi_sg_count(cmd); 753 } else { 754 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 755 cmd->scsi_done(cmd); 756 } 757 758 return qc; 759 } 760 761 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 762 { 763 struct scsi_cmnd *scmd = qc->scsicmd; 764 765 qc->extrabytes = scmd->request->extra_len; 766 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 767 } 768 769 /** 770 * ata_dump_status - user friendly display of error info 771 * @id: id of the port in question 772 * @tf: ptr to filled out taskfile 773 * 774 * Decode and dump the ATA error/status registers for the user so 775 * that they have some idea what really happened at the non 776 * make-believe layer. 777 * 778 * LOCKING: 779 * inherited from caller 780 */ 781 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 782 { 783 u8 stat = tf->command, err = tf->feature; 784 785 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 786 if (stat & ATA_BUSY) { 787 printk("Busy }\n"); /* Data is not valid in this case */ 788 } else { 789 if (stat & 0x40) printk("DriveReady "); 790 if (stat & 0x20) printk("DeviceFault "); 791 if (stat & 0x10) printk("SeekComplete "); 792 if (stat & 0x08) printk("DataRequest "); 793 if (stat & 0x04) printk("CorrectedError "); 794 if (stat & 0x02) printk("Index "); 795 if (stat & 0x01) printk("Error "); 796 printk("}\n"); 797 798 if (err) { 799 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 800 if (err & 0x04) printk("DriveStatusError "); 801 if (err & 0x80) { 802 if (err & 0x04) printk("BadCRC "); 803 else printk("Sector "); 804 } 805 if (err & 0x40) printk("UncorrectableError "); 806 if (err & 0x10) printk("SectorIdNotFound "); 807 if (err & 0x02) printk("TrackZeroNotFound "); 808 if (err & 0x01) printk("AddrMarkNotFound "); 809 printk("}\n"); 810 } 811 } 812 } 813 814 /** 815 * ata_to_sense_error - convert ATA error to SCSI error 816 * @id: ATA device number 817 * @drv_stat: value contained in ATA status register 818 * @drv_err: value contained in ATA error register 819 * @sk: the sense key we'll fill out 820 * @asc: the additional sense code we'll fill out 821 * @ascq: the additional sense code qualifier we'll fill out 822 * @verbose: be verbose 823 * 824 * Converts an ATA error into a SCSI error. Fill out pointers to 825 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 826 * format sense blocks. 827 * 828 * LOCKING: 829 * spin_lock_irqsave(host lock) 830 */ 831 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 832 u8 *asc, u8 *ascq, int verbose) 833 { 834 int i; 835 836 /* Based on the 3ware driver translation table */ 837 static const unsigned char sense_table[][4] = { 838 /* BBD|ECC|ID|MAR */ 839 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 840 /* BBD|ECC|ID */ 841 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 842 /* ECC|MC|MARK */ 843 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 844 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 845 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 846 /* MC|ID|ABRT|TRK0|MARK */ 847 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 848 /* MCR|MARK */ 849 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 850 /* Bad address mark */ 851 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 852 /* TRK0 */ 853 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 854 /* Abort: 0x04 is not translated here, see below */ 855 /* Media change request */ 856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 857 /* SRV/IDNF */ 858 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, // ID not found Logical address out of range 859 /* MC */ 860 {0x20, UNIT_ATTENTION, 0x28, 0x00}, // Media Changed Not ready to ready change, medium may have changed 861 /* ECC */ 862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 863 /* BBD - block marked bad */ 864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 866 }; 867 static const unsigned char stat_table[][4] = { 868 /* Must be first because BUSY means no other bits valid */ 869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 870 {0x20, HARDWARE_ERROR, 0x44, 0x00}, // Device fault, internal target failure 871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 874 }; 875 876 /* 877 * Is this an error we can process/parse 878 */ 879 if (drv_stat & ATA_BUSY) { 880 drv_err = 0; /* Ignore the err bits, they're invalid */ 881 } 882 883 if (drv_err) { 884 /* Look for drv_err */ 885 for (i = 0; sense_table[i][0] != 0xFF; i++) { 886 /* Look for best matches first */ 887 if ((sense_table[i][0] & drv_err) == 888 sense_table[i][0]) { 889 *sk = sense_table[i][1]; 890 *asc = sense_table[i][2]; 891 *ascq = sense_table[i][3]; 892 goto translate_done; 893 } 894 } 895 } 896 897 /* 898 * Fall back to interpreting status bits. Note that if the drv_err 899 * has only the ABRT bit set, we decode drv_stat. ABRT by itself 900 * is not descriptive enough. 901 */ 902 for (i = 0; stat_table[i][0] != 0xFF; i++) { 903 if (stat_table[i][0] & drv_stat) { 904 *sk = stat_table[i][1]; 905 *asc = stat_table[i][2]; 906 *ascq = stat_table[i][3]; 907 goto translate_done; 908 } 909 } 910 911 /* 912 * We need a sensible error return here, which is tricky, and one 913 * that won't cause people to do things like return a disk wrongly. 914 */ 915 *sk = ABORTED_COMMAND; 916 *asc = 0x00; 917 *ascq = 0x00; 918 919 translate_done: 920 if (verbose) 921 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 922 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 923 id, drv_stat, drv_err, *sk, *asc, *ascq); 924 return; 925 } 926 927 /* 928 * ata_gen_passthru_sense - Generate check condition sense block. 929 * @qc: Command that completed. 930 * 931 * This function is specific to the ATA descriptor format sense 932 * block specified for the ATA pass through commands. Regardless 933 * of whether the command errored or not, return a sense 934 * block. Copy all controller registers into the sense 935 * block. If there was no error, we get the request from an ATA 936 * passthrough command, so we use the following sense data: 937 * sk = RECOVERED ERROR 938 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 939 * 940 * 941 * LOCKING: 942 * None. 943 */ 944 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 945 { 946 struct scsi_cmnd *cmd = qc->scsicmd; 947 struct ata_taskfile *tf = &qc->result_tf; 948 unsigned char *sb = cmd->sense_buffer; 949 unsigned char *desc = sb + 8; 950 int verbose = qc->ap->ops->error_handler == NULL; 951 952 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 953 954 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 955 956 /* 957 * Use ata_to_sense_error() to map status register bits 958 * onto sense key, asc & ascq. 959 */ 960 if (qc->err_mask || 961 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 962 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 963 &sb[1], &sb[2], &sb[3], verbose); 964 sb[1] &= 0x0f; 965 } else { 966 sb[1] = RECOVERED_ERROR; 967 sb[2] = 0; 968 sb[3] = 0x1D; 969 } 970 971 /* 972 * Sense data is current and format is descriptor. 973 */ 974 sb[0] = 0x72; 975 976 desc[0] = 0x09; 977 978 /* set length of additional sense data */ 979 sb[7] = 14; 980 desc[1] = 12; 981 982 /* 983 * Copy registers into sense buffer. 984 */ 985 desc[2] = 0x00; 986 desc[3] = tf->feature; /* == error reg */ 987 desc[5] = tf->nsect; 988 desc[7] = tf->lbal; 989 desc[9] = tf->lbam; 990 desc[11] = tf->lbah; 991 desc[12] = tf->device; 992 desc[13] = tf->command; /* == status reg */ 993 994 /* 995 * Fill in Extend bit, and the high order bytes 996 * if applicable. 997 */ 998 if (tf->flags & ATA_TFLAG_LBA48) { 999 desc[2] |= 0x01; 1000 desc[4] = tf->hob_nsect; 1001 desc[6] = tf->hob_lbal; 1002 desc[8] = tf->hob_lbam; 1003 desc[10] = tf->hob_lbah; 1004 } 1005 } 1006 1007 /** 1008 * ata_gen_ata_sense - generate a SCSI fixed sense block 1009 * @qc: Command that we are erroring out 1010 * 1011 * Generate sense block for a failed ATA command @qc. Descriptor 1012 * format is used to accommodate LBA48 block address. 1013 * 1014 * LOCKING: 1015 * None. 1016 */ 1017 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1018 { 1019 struct ata_device *dev = qc->dev; 1020 struct scsi_cmnd *cmd = qc->scsicmd; 1021 struct ata_taskfile *tf = &qc->result_tf; 1022 unsigned char *sb = cmd->sense_buffer; 1023 unsigned char *desc = sb + 8; 1024 int verbose = qc->ap->ops->error_handler == NULL; 1025 u64 block; 1026 1027 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1028 1029 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1030 1031 /* sense data is current and format is descriptor */ 1032 sb[0] = 0x72; 1033 1034 /* Use ata_to_sense_error() to map status register bits 1035 * onto sense key, asc & ascq. 1036 */ 1037 if (qc->err_mask || 1038 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1039 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1040 &sb[1], &sb[2], &sb[3], verbose); 1041 sb[1] &= 0x0f; 1042 } 1043 1044 block = ata_tf_read_block(&qc->result_tf, dev); 1045 1046 /* information sense data descriptor */ 1047 sb[7] = 12; 1048 desc[0] = 0x00; 1049 desc[1] = 10; 1050 1051 desc[2] |= 0x80; /* valid */ 1052 desc[6] = block >> 40; 1053 desc[7] = block >> 32; 1054 desc[8] = block >> 24; 1055 desc[9] = block >> 16; 1056 desc[10] = block >> 8; 1057 desc[11] = block; 1058 } 1059 1060 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1061 { 1062 sdev->use_10_for_rw = 1; 1063 sdev->use_10_for_ms = 1; 1064 sdev->no_report_opcodes = 1; 1065 sdev->no_write_same = 1; 1066 1067 /* Schedule policy is determined by ->qc_defer() callback and 1068 * it needs to see every deferred qc. Set dev_blocked to 1 to 1069 * prevent SCSI midlayer from automatically deferring 1070 * requests. 1071 */ 1072 sdev->max_device_blocked = 1; 1073 } 1074 1075 /** 1076 * atapi_drain_needed - Check whether data transfer may overflow 1077 * @rq: request to be checked 1078 * 1079 * ATAPI commands which transfer variable length data to host 1080 * might overflow due to application error or hardare bug. This 1081 * function checks whether overflow should be drained and ignored 1082 * for @request. 1083 * 1084 * LOCKING: 1085 * None. 1086 * 1087 * RETURNS: 1088 * 1 if ; otherwise, 0. 1089 */ 1090 static int atapi_drain_needed(struct request *rq) 1091 { 1092 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1093 return 0; 1094 1095 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1096 return 0; 1097 1098 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1099 } 1100 1101 static int ata_scsi_dev_config(struct scsi_device *sdev, 1102 struct ata_device *dev) 1103 { 1104 struct request_queue *q = sdev->request_queue; 1105 1106 if (!ata_id_has_unload(dev->id)) 1107 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1108 1109 /* configure max sectors */ 1110 blk_queue_max_hw_sectors(q, dev->max_sectors); 1111 1112 if (dev->class == ATA_DEV_ATAPI) { 1113 void *buf; 1114 1115 sdev->sector_size = ATA_SECT_SIZE; 1116 1117 /* set DMA padding */ 1118 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1119 1120 /* configure draining */ 1121 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1122 if (!buf) { 1123 ata_dev_err(dev, "drain buffer allocation failed\n"); 1124 return -ENOMEM; 1125 } 1126 1127 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1128 } else { 1129 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1130 sdev->manage_start_stop = 1; 1131 } 1132 1133 /* 1134 * ata_pio_sectors() expects buffer for each sector to not cross 1135 * page boundary. Enforce it by requiring buffers to be sector 1136 * aligned, which works iff sector_size is not larger than 1137 * PAGE_SIZE. ATAPI devices also need the alignment as 1138 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1139 */ 1140 if (sdev->sector_size > PAGE_SIZE) 1141 ata_dev_warn(dev, 1142 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1143 sdev->sector_size); 1144 1145 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1146 1147 if (dev->flags & ATA_DFLAG_AN) 1148 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1149 1150 if (dev->flags & ATA_DFLAG_NCQ) { 1151 int depth; 1152 1153 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1154 depth = min(ATA_MAX_QUEUE - 1, depth); 1155 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1156 } 1157 1158 blk_queue_flush_queueable(q, false); 1159 1160 dev->sdev = sdev; 1161 return 0; 1162 } 1163 1164 /** 1165 * ata_scsi_slave_config - Set SCSI device attributes 1166 * @sdev: SCSI device to examine 1167 * 1168 * This is called before we actually start reading 1169 * and writing to the device, to configure certain 1170 * SCSI mid-layer behaviors. 1171 * 1172 * LOCKING: 1173 * Defined by SCSI layer. We don't really care. 1174 */ 1175 1176 int ata_scsi_slave_config(struct scsi_device *sdev) 1177 { 1178 struct ata_port *ap = ata_shost_to_port(sdev->host); 1179 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1180 int rc = 0; 1181 1182 ata_scsi_sdev_config(sdev); 1183 1184 if (dev) 1185 rc = ata_scsi_dev_config(sdev, dev); 1186 1187 return rc; 1188 } 1189 1190 /** 1191 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1192 * @sdev: SCSI device to be destroyed 1193 * 1194 * @sdev is about to be destroyed for hot/warm unplugging. If 1195 * this unplugging was initiated by libata as indicated by NULL 1196 * dev->sdev, this function doesn't have to do anything. 1197 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1198 * Clear dev->sdev, schedule the device for ATA detach and invoke 1199 * EH. 1200 * 1201 * LOCKING: 1202 * Defined by SCSI layer. We don't really care. 1203 */ 1204 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1205 { 1206 struct ata_port *ap = ata_shost_to_port(sdev->host); 1207 struct request_queue *q = sdev->request_queue; 1208 unsigned long flags; 1209 struct ata_device *dev; 1210 1211 if (!ap->ops->error_handler) 1212 return; 1213 1214 spin_lock_irqsave(ap->lock, flags); 1215 dev = __ata_scsi_find_dev(ap, sdev); 1216 if (dev && dev->sdev) { 1217 /* SCSI device already in CANCEL state, no need to offline it */ 1218 dev->sdev = NULL; 1219 dev->flags |= ATA_DFLAG_DETACH; 1220 ata_port_schedule_eh(ap); 1221 } 1222 spin_unlock_irqrestore(ap->lock, flags); 1223 1224 kfree(q->dma_drain_buffer); 1225 q->dma_drain_buffer = NULL; 1226 q->dma_drain_size = 0; 1227 } 1228 1229 /** 1230 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1231 * @ap: ATA port to which the device change the queue depth 1232 * @sdev: SCSI device to configure queue depth for 1233 * @queue_depth: new queue depth 1234 * @reason: calling context 1235 * 1236 * libsas and libata have different approaches for associating a sdev to 1237 * its ata_port. 1238 * 1239 */ 1240 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1241 int queue_depth, int reason) 1242 { 1243 struct ata_device *dev; 1244 unsigned long flags; 1245 1246 if (reason != SCSI_QDEPTH_DEFAULT) 1247 return -EOPNOTSUPP; 1248 1249 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1250 return sdev->queue_depth; 1251 1252 dev = ata_scsi_find_dev(ap, sdev); 1253 if (!dev || !ata_dev_enabled(dev)) 1254 return sdev->queue_depth; 1255 1256 /* NCQ enabled? */ 1257 spin_lock_irqsave(ap->lock, flags); 1258 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1259 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1260 dev->flags |= ATA_DFLAG_NCQ_OFF; 1261 queue_depth = 1; 1262 } 1263 spin_unlock_irqrestore(ap->lock, flags); 1264 1265 /* limit and apply queue depth */ 1266 queue_depth = min(queue_depth, sdev->host->can_queue); 1267 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1268 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1269 1270 if (sdev->queue_depth == queue_depth) 1271 return -EINVAL; 1272 1273 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1274 return queue_depth; 1275 } 1276 1277 /** 1278 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1279 * @sdev: SCSI device to configure queue depth for 1280 * @queue_depth: new queue depth 1281 * @reason: calling context 1282 * 1283 * This is libata standard hostt->change_queue_depth callback. 1284 * SCSI will call into this callback when user tries to set queue 1285 * depth via sysfs. 1286 * 1287 * LOCKING: 1288 * SCSI layer (we don't care) 1289 * 1290 * RETURNS: 1291 * Newly configured queue depth. 1292 */ 1293 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1294 int reason) 1295 { 1296 struct ata_port *ap = ata_shost_to_port(sdev->host); 1297 1298 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1299 } 1300 1301 /** 1302 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1303 * @qc: Storage for translated ATA taskfile 1304 * 1305 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1306 * (to start). Perhaps these commands should be preceded by 1307 * CHECK POWER MODE to see what power mode the device is already in. 1308 * [See SAT revision 5 at www.t10.org] 1309 * 1310 * LOCKING: 1311 * spin_lock_irqsave(host lock) 1312 * 1313 * RETURNS: 1314 * Zero on success, non-zero on error. 1315 */ 1316 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1317 { 1318 struct scsi_cmnd *scmd = qc->scsicmd; 1319 struct ata_taskfile *tf = &qc->tf; 1320 const u8 *cdb = scmd->cmnd; 1321 1322 if (scmd->cmd_len < 5) 1323 goto invalid_fld; 1324 1325 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1326 tf->protocol = ATA_PROT_NODATA; 1327 if (cdb[1] & 0x1) { 1328 ; /* ignore IMMED bit, violates sat-r05 */ 1329 } 1330 if (cdb[4] & 0x2) 1331 goto invalid_fld; /* LOEJ bit set not supported */ 1332 if (((cdb[4] >> 4) & 0xf) != 0) 1333 goto invalid_fld; /* power conditions not supported */ 1334 1335 if (cdb[4] & 0x1) { 1336 tf->nsect = 1; /* 1 sector, lba=0 */ 1337 1338 if (qc->dev->flags & ATA_DFLAG_LBA) { 1339 tf->flags |= ATA_TFLAG_LBA; 1340 1341 tf->lbah = 0x0; 1342 tf->lbam = 0x0; 1343 tf->lbal = 0x0; 1344 tf->device |= ATA_LBA; 1345 } else { 1346 /* CHS */ 1347 tf->lbal = 0x1; /* sect */ 1348 tf->lbam = 0x0; /* cyl low */ 1349 tf->lbah = 0x0; /* cyl high */ 1350 } 1351 1352 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1353 } else { 1354 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1355 * or S5) causing some drives to spin up and down again. 1356 */ 1357 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1358 system_state == SYSTEM_POWER_OFF) 1359 goto skip; 1360 1361 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1362 system_entering_hibernation()) 1363 goto skip; 1364 1365 /* Issue ATA STANDBY IMMEDIATE command */ 1366 tf->command = ATA_CMD_STANDBYNOW1; 1367 } 1368 1369 /* 1370 * Standby and Idle condition timers could be implemented but that 1371 * would require libata to implement the Power condition mode page 1372 * and allow the user to change it. Changing mode pages requires 1373 * MODE SELECT to be implemented. 1374 */ 1375 1376 return 0; 1377 1378 invalid_fld: 1379 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1380 /* "Invalid field in cbd" */ 1381 return 1; 1382 skip: 1383 scmd->result = SAM_STAT_GOOD; 1384 return 1; 1385 } 1386 1387 1388 /** 1389 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1390 * @qc: Storage for translated ATA taskfile 1391 * 1392 * Sets up an ATA taskfile to issue FLUSH CACHE or 1393 * FLUSH CACHE EXT. 1394 * 1395 * LOCKING: 1396 * spin_lock_irqsave(host lock) 1397 * 1398 * RETURNS: 1399 * Zero on success, non-zero on error. 1400 */ 1401 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1402 { 1403 struct ata_taskfile *tf = &qc->tf; 1404 1405 tf->flags |= ATA_TFLAG_DEVICE; 1406 tf->protocol = ATA_PROT_NODATA; 1407 1408 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1409 tf->command = ATA_CMD_FLUSH_EXT; 1410 else 1411 tf->command = ATA_CMD_FLUSH; 1412 1413 /* flush is critical for IO integrity, consider it an IO command */ 1414 qc->flags |= ATA_QCFLAG_IO; 1415 1416 return 0; 1417 } 1418 1419 /** 1420 * scsi_6_lba_len - Get LBA and transfer length 1421 * @cdb: SCSI command to translate 1422 * 1423 * Calculate LBA and transfer length for 6-byte commands. 1424 * 1425 * RETURNS: 1426 * @plba: the LBA 1427 * @plen: the transfer length 1428 */ 1429 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1430 { 1431 u64 lba = 0; 1432 u32 len; 1433 1434 VPRINTK("six-byte command\n"); 1435 1436 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1437 lba |= ((u64)cdb[2]) << 8; 1438 lba |= ((u64)cdb[3]); 1439 1440 len = cdb[4]; 1441 1442 *plba = lba; 1443 *plen = len; 1444 } 1445 1446 /** 1447 * scsi_10_lba_len - Get LBA and transfer length 1448 * @cdb: SCSI command to translate 1449 * 1450 * Calculate LBA and transfer length for 10-byte commands. 1451 * 1452 * RETURNS: 1453 * @plba: the LBA 1454 * @plen: the transfer length 1455 */ 1456 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1457 { 1458 u64 lba = 0; 1459 u32 len = 0; 1460 1461 VPRINTK("ten-byte command\n"); 1462 1463 lba |= ((u64)cdb[2]) << 24; 1464 lba |= ((u64)cdb[3]) << 16; 1465 lba |= ((u64)cdb[4]) << 8; 1466 lba |= ((u64)cdb[5]); 1467 1468 len |= ((u32)cdb[7]) << 8; 1469 len |= ((u32)cdb[8]); 1470 1471 *plba = lba; 1472 *plen = len; 1473 } 1474 1475 /** 1476 * scsi_16_lba_len - Get LBA and transfer length 1477 * @cdb: SCSI command to translate 1478 * 1479 * Calculate LBA and transfer length for 16-byte commands. 1480 * 1481 * RETURNS: 1482 * @plba: the LBA 1483 * @plen: the transfer length 1484 */ 1485 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1486 { 1487 u64 lba = 0; 1488 u32 len = 0; 1489 1490 VPRINTK("sixteen-byte command\n"); 1491 1492 lba |= ((u64)cdb[2]) << 56; 1493 lba |= ((u64)cdb[3]) << 48; 1494 lba |= ((u64)cdb[4]) << 40; 1495 lba |= ((u64)cdb[5]) << 32; 1496 lba |= ((u64)cdb[6]) << 24; 1497 lba |= ((u64)cdb[7]) << 16; 1498 lba |= ((u64)cdb[8]) << 8; 1499 lba |= ((u64)cdb[9]); 1500 1501 len |= ((u32)cdb[10]) << 24; 1502 len |= ((u32)cdb[11]) << 16; 1503 len |= ((u32)cdb[12]) << 8; 1504 len |= ((u32)cdb[13]); 1505 1506 *plba = lba; 1507 *plen = len; 1508 } 1509 1510 /** 1511 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1512 * @qc: Storage for translated ATA taskfile 1513 * 1514 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1515 * 1516 * LOCKING: 1517 * spin_lock_irqsave(host lock) 1518 * 1519 * RETURNS: 1520 * Zero on success, non-zero on error. 1521 */ 1522 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1523 { 1524 struct scsi_cmnd *scmd = qc->scsicmd; 1525 struct ata_taskfile *tf = &qc->tf; 1526 struct ata_device *dev = qc->dev; 1527 u64 dev_sectors = qc->dev->n_sectors; 1528 const u8 *cdb = scmd->cmnd; 1529 u64 block; 1530 u32 n_block; 1531 1532 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1533 tf->protocol = ATA_PROT_NODATA; 1534 1535 if (cdb[0] == VERIFY) { 1536 if (scmd->cmd_len < 10) 1537 goto invalid_fld; 1538 scsi_10_lba_len(cdb, &block, &n_block); 1539 } else if (cdb[0] == VERIFY_16) { 1540 if (scmd->cmd_len < 16) 1541 goto invalid_fld; 1542 scsi_16_lba_len(cdb, &block, &n_block); 1543 } else 1544 goto invalid_fld; 1545 1546 if (!n_block) 1547 goto nothing_to_do; 1548 if (block >= dev_sectors) 1549 goto out_of_range; 1550 if ((block + n_block) > dev_sectors) 1551 goto out_of_range; 1552 1553 if (dev->flags & ATA_DFLAG_LBA) { 1554 tf->flags |= ATA_TFLAG_LBA; 1555 1556 if (lba_28_ok(block, n_block)) { 1557 /* use LBA28 */ 1558 tf->command = ATA_CMD_VERIFY; 1559 tf->device |= (block >> 24) & 0xf; 1560 } else if (lba_48_ok(block, n_block)) { 1561 if (!(dev->flags & ATA_DFLAG_LBA48)) 1562 goto out_of_range; 1563 1564 /* use LBA48 */ 1565 tf->flags |= ATA_TFLAG_LBA48; 1566 tf->command = ATA_CMD_VERIFY_EXT; 1567 1568 tf->hob_nsect = (n_block >> 8) & 0xff; 1569 1570 tf->hob_lbah = (block >> 40) & 0xff; 1571 tf->hob_lbam = (block >> 32) & 0xff; 1572 tf->hob_lbal = (block >> 24) & 0xff; 1573 } else 1574 /* request too large even for LBA48 */ 1575 goto out_of_range; 1576 1577 tf->nsect = n_block & 0xff; 1578 1579 tf->lbah = (block >> 16) & 0xff; 1580 tf->lbam = (block >> 8) & 0xff; 1581 tf->lbal = block & 0xff; 1582 1583 tf->device |= ATA_LBA; 1584 } else { 1585 /* CHS */ 1586 u32 sect, head, cyl, track; 1587 1588 if (!lba_28_ok(block, n_block)) 1589 goto out_of_range; 1590 1591 /* Convert LBA to CHS */ 1592 track = (u32)block / dev->sectors; 1593 cyl = track / dev->heads; 1594 head = track % dev->heads; 1595 sect = (u32)block % dev->sectors + 1; 1596 1597 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1598 (u32)block, track, cyl, head, sect); 1599 1600 /* Check whether the converted CHS can fit. 1601 Cylinder: 0-65535 1602 Head: 0-15 1603 Sector: 1-255*/ 1604 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1605 goto out_of_range; 1606 1607 tf->command = ATA_CMD_VERIFY; 1608 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1609 tf->lbal = sect; 1610 tf->lbam = cyl; 1611 tf->lbah = cyl >> 8; 1612 tf->device |= head; 1613 } 1614 1615 return 0; 1616 1617 invalid_fld: 1618 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1619 /* "Invalid field in cbd" */ 1620 return 1; 1621 1622 out_of_range: 1623 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1624 /* "Logical Block Address out of range" */ 1625 return 1; 1626 1627 nothing_to_do: 1628 scmd->result = SAM_STAT_GOOD; 1629 return 1; 1630 } 1631 1632 /** 1633 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1634 * @qc: Storage for translated ATA taskfile 1635 * 1636 * Converts any of six SCSI read/write commands into the 1637 * ATA counterpart, including starting sector (LBA), 1638 * sector count, and taking into account the device's LBA48 1639 * support. 1640 * 1641 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1642 * %WRITE_16 are currently supported. 1643 * 1644 * LOCKING: 1645 * spin_lock_irqsave(host lock) 1646 * 1647 * RETURNS: 1648 * Zero on success, non-zero on error. 1649 */ 1650 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1651 { 1652 struct scsi_cmnd *scmd = qc->scsicmd; 1653 const u8 *cdb = scmd->cmnd; 1654 unsigned int tf_flags = 0; 1655 u64 block; 1656 u32 n_block; 1657 int rc; 1658 1659 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1660 tf_flags |= ATA_TFLAG_WRITE; 1661 1662 /* Calculate the SCSI LBA, transfer length and FUA. */ 1663 switch (cdb[0]) { 1664 case READ_10: 1665 case WRITE_10: 1666 if (unlikely(scmd->cmd_len < 10)) 1667 goto invalid_fld; 1668 scsi_10_lba_len(cdb, &block, &n_block); 1669 if (cdb[1] & (1 << 3)) 1670 tf_flags |= ATA_TFLAG_FUA; 1671 break; 1672 case READ_6: 1673 case WRITE_6: 1674 if (unlikely(scmd->cmd_len < 6)) 1675 goto invalid_fld; 1676 scsi_6_lba_len(cdb, &block, &n_block); 1677 1678 /* for 6-byte r/w commands, transfer length 0 1679 * means 256 blocks of data, not 0 block. 1680 */ 1681 if (!n_block) 1682 n_block = 256; 1683 break; 1684 case READ_16: 1685 case WRITE_16: 1686 if (unlikely(scmd->cmd_len < 16)) 1687 goto invalid_fld; 1688 scsi_16_lba_len(cdb, &block, &n_block); 1689 if (cdb[1] & (1 << 3)) 1690 tf_flags |= ATA_TFLAG_FUA; 1691 break; 1692 default: 1693 DPRINTK("no-byte command\n"); 1694 goto invalid_fld; 1695 } 1696 1697 /* Check and compose ATA command */ 1698 if (!n_block) 1699 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1700 * length 0 means transfer 0 block of data. 1701 * However, for ATA R/W commands, sector count 0 means 1702 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1703 * 1704 * WARNING: one or two older ATA drives treat 0 as 0... 1705 */ 1706 goto nothing_to_do; 1707 1708 qc->flags |= ATA_QCFLAG_IO; 1709 qc->nbytes = n_block * scmd->device->sector_size; 1710 1711 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1712 qc->tag); 1713 if (likely(rc == 0)) 1714 return 0; 1715 1716 if (rc == -ERANGE) 1717 goto out_of_range; 1718 /* treat all other errors as -EINVAL, fall through */ 1719 invalid_fld: 1720 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1721 /* "Invalid field in cbd" */ 1722 return 1; 1723 1724 out_of_range: 1725 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1726 /* "Logical Block Address out of range" */ 1727 return 1; 1728 1729 nothing_to_do: 1730 scmd->result = SAM_STAT_GOOD; 1731 return 1; 1732 } 1733 1734 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1735 { 1736 struct ata_port *ap = qc->ap; 1737 struct scsi_cmnd *cmd = qc->scsicmd; 1738 u8 *cdb = cmd->cmnd; 1739 int need_sense = (qc->err_mask != 0); 1740 1741 /* For ATA pass thru (SAT) commands, generate a sense block if 1742 * user mandated it or if there's an error. Note that if we 1743 * generate because the user forced us to [CK_COND =1], a check 1744 * condition is generated and the ATA register values are returned 1745 * whether the command completed successfully or not. If there 1746 * was no error, we use the following sense data: 1747 * sk = RECOVERED ERROR 1748 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1749 */ 1750 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1751 ((cdb[2] & 0x20) || need_sense)) { 1752 ata_gen_passthru_sense(qc); 1753 } else { 1754 if (!need_sense) { 1755 cmd->result = SAM_STAT_GOOD; 1756 } else { 1757 /* TODO: decide which descriptor format to use 1758 * for 48b LBA devices and call that here 1759 * instead of the fixed desc, which is only 1760 * good for smaller LBA (and maybe CHS?) 1761 * devices. 1762 */ 1763 ata_gen_ata_sense(qc); 1764 } 1765 } 1766 1767 if (need_sense && !ap->ops->error_handler) 1768 ata_dump_status(ap->print_id, &qc->result_tf); 1769 1770 qc->scsidone(cmd); 1771 1772 ata_qc_free(qc); 1773 } 1774 1775 /** 1776 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1777 * @dev: ATA device to which the command is addressed 1778 * @cmd: SCSI command to execute 1779 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1780 * 1781 * Our ->queuecommand() function has decided that the SCSI 1782 * command issued can be directly translated into an ATA 1783 * command, rather than handled internally. 1784 * 1785 * This function sets up an ata_queued_cmd structure for the 1786 * SCSI command, and sends that ata_queued_cmd to the hardware. 1787 * 1788 * The xlat_func argument (actor) returns 0 if ready to execute 1789 * ATA command, else 1 to finish translation. If 1 is returned 1790 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1791 * to be set reflecting an error condition or clean (early) 1792 * termination. 1793 * 1794 * LOCKING: 1795 * spin_lock_irqsave(host lock) 1796 * 1797 * RETURNS: 1798 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1799 * needs to be deferred. 1800 */ 1801 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1802 ata_xlat_func_t xlat_func) 1803 { 1804 struct ata_port *ap = dev->link->ap; 1805 struct ata_queued_cmd *qc; 1806 int rc; 1807 1808 VPRINTK("ENTER\n"); 1809 1810 qc = ata_scsi_qc_new(dev, cmd); 1811 if (!qc) 1812 goto err_mem; 1813 1814 /* data is present; dma-map it */ 1815 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1816 cmd->sc_data_direction == DMA_TO_DEVICE) { 1817 if (unlikely(scsi_bufflen(cmd) < 1)) { 1818 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1819 goto err_did; 1820 } 1821 1822 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1823 1824 qc->dma_dir = cmd->sc_data_direction; 1825 } 1826 1827 qc->complete_fn = ata_scsi_qc_complete; 1828 1829 if (xlat_func(qc)) 1830 goto early_finish; 1831 1832 if (ap->ops->qc_defer) { 1833 if ((rc = ap->ops->qc_defer(qc))) 1834 goto defer; 1835 } 1836 1837 /* select device, send command to hardware */ 1838 ata_qc_issue(qc); 1839 1840 VPRINTK("EXIT\n"); 1841 return 0; 1842 1843 early_finish: 1844 ata_qc_free(qc); 1845 cmd->scsi_done(cmd); 1846 DPRINTK("EXIT - early finish (good or error)\n"); 1847 return 0; 1848 1849 err_did: 1850 ata_qc_free(qc); 1851 cmd->result = (DID_ERROR << 16); 1852 cmd->scsi_done(cmd); 1853 err_mem: 1854 DPRINTK("EXIT - internal\n"); 1855 return 0; 1856 1857 defer: 1858 ata_qc_free(qc); 1859 DPRINTK("EXIT - defer\n"); 1860 if (rc == ATA_DEFER_LINK) 1861 return SCSI_MLQUEUE_DEVICE_BUSY; 1862 else 1863 return SCSI_MLQUEUE_HOST_BUSY; 1864 } 1865 1866 /** 1867 * ata_scsi_rbuf_get - Map response buffer. 1868 * @cmd: SCSI command containing buffer to be mapped. 1869 * @flags: unsigned long variable to store irq enable status 1870 * @copy_in: copy in from user buffer 1871 * 1872 * Prepare buffer for simulated SCSI commands. 1873 * 1874 * LOCKING: 1875 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1876 * 1877 * RETURNS: 1878 * Pointer to response buffer. 1879 */ 1880 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1881 unsigned long *flags) 1882 { 1883 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1884 1885 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1886 if (copy_in) 1887 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1888 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1889 return ata_scsi_rbuf; 1890 } 1891 1892 /** 1893 * ata_scsi_rbuf_put - Unmap response buffer. 1894 * @cmd: SCSI command containing buffer to be unmapped. 1895 * @copy_out: copy out result 1896 * @flags: @flags passed to ata_scsi_rbuf_get() 1897 * 1898 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1899 * @copy_back is true. 1900 * 1901 * LOCKING: 1902 * Unlocks ata_scsi_rbuf_lock. 1903 */ 1904 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1905 unsigned long *flags) 1906 { 1907 if (copy_out) 1908 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1909 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1910 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1911 } 1912 1913 /** 1914 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1915 * @args: device IDENTIFY data / SCSI command of interest. 1916 * @actor: Callback hook for desired SCSI command simulator 1917 * 1918 * Takes care of the hard work of simulating a SCSI command... 1919 * Mapping the response buffer, calling the command's handler, 1920 * and handling the handler's return value. This return value 1921 * indicates whether the handler wishes the SCSI command to be 1922 * completed successfully (0), or not (in which case cmd->result 1923 * and sense buffer are assumed to be set). 1924 * 1925 * LOCKING: 1926 * spin_lock_irqsave(host lock) 1927 */ 1928 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1929 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1930 { 1931 u8 *rbuf; 1932 unsigned int rc; 1933 struct scsi_cmnd *cmd = args->cmd; 1934 unsigned long flags; 1935 1936 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1937 rc = actor(args, rbuf); 1938 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1939 1940 if (rc == 0) 1941 cmd->result = SAM_STAT_GOOD; 1942 args->done(cmd); 1943 } 1944 1945 /** 1946 * ata_scsiop_inq_std - Simulate INQUIRY command 1947 * @args: device IDENTIFY data / SCSI command of interest. 1948 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1949 * 1950 * Returns standard device identification data associated 1951 * with non-VPD INQUIRY command output. 1952 * 1953 * LOCKING: 1954 * spin_lock_irqsave(host lock) 1955 */ 1956 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1957 { 1958 const u8 versions[] = { 1959 0x60, /* SAM-3 (no version claimed) */ 1960 1961 0x03, 1962 0x20, /* SBC-2 (no version claimed) */ 1963 1964 0x02, 1965 0x60 /* SPC-3 (no version claimed) */ 1966 }; 1967 u8 hdr[] = { 1968 TYPE_DISK, 1969 0, 1970 0x5, /* claim SPC-3 version compatibility */ 1971 2, 1972 95 - 4 1973 }; 1974 1975 VPRINTK("ENTER\n"); 1976 1977 /* set scsi removeable (RMB) bit per ata bit */ 1978 if (ata_id_removeable(args->id)) 1979 hdr[1] |= (1 << 7); 1980 1981 memcpy(rbuf, hdr, sizeof(hdr)); 1982 memcpy(&rbuf[8], "ATA ", 8); 1983 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1984 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1985 1986 if (rbuf[32] == 0 || rbuf[32] == ' ') 1987 memcpy(&rbuf[32], "n/a ", 4); 1988 1989 memcpy(rbuf + 59, versions, sizeof(versions)); 1990 1991 return 0; 1992 } 1993 1994 /** 1995 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1996 * @args: device IDENTIFY data / SCSI command of interest. 1997 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1998 * 1999 * Returns list of inquiry VPD pages available. 2000 * 2001 * LOCKING: 2002 * spin_lock_irqsave(host lock) 2003 */ 2004 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2005 { 2006 const u8 pages[] = { 2007 0x00, /* page 0x00, this page */ 2008 0x80, /* page 0x80, unit serial no page */ 2009 0x83, /* page 0x83, device ident page */ 2010 0x89, /* page 0x89, ata info page */ 2011 0xb0, /* page 0xb0, block limits page */ 2012 0xb1, /* page 0xb1, block device characteristics page */ 2013 0xb2, /* page 0xb2, thin provisioning page */ 2014 }; 2015 2016 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2017 memcpy(rbuf + 4, pages, sizeof(pages)); 2018 return 0; 2019 } 2020 2021 /** 2022 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2023 * @args: device IDENTIFY data / SCSI command of interest. 2024 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2025 * 2026 * Returns ATA device serial number. 2027 * 2028 * LOCKING: 2029 * spin_lock_irqsave(host lock) 2030 */ 2031 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2032 { 2033 const u8 hdr[] = { 2034 0, 2035 0x80, /* this page code */ 2036 0, 2037 ATA_ID_SERNO_LEN, /* page len */ 2038 }; 2039 2040 memcpy(rbuf, hdr, sizeof(hdr)); 2041 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2042 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2043 return 0; 2044 } 2045 2046 /** 2047 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2048 * @args: device IDENTIFY data / SCSI command of interest. 2049 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2050 * 2051 * Yields two logical unit device identification designators: 2052 * - vendor specific ASCII containing the ATA serial number 2053 * - SAT defined "t10 vendor id based" containing ASCII vendor 2054 * name ("ATA "), model and serial numbers. 2055 * 2056 * LOCKING: 2057 * spin_lock_irqsave(host lock) 2058 */ 2059 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2060 { 2061 const int sat_model_serial_desc_len = 68; 2062 int num; 2063 2064 rbuf[1] = 0x83; /* this page code */ 2065 num = 4; 2066 2067 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2068 rbuf[num + 0] = 2; 2069 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2070 num += 4; 2071 ata_id_string(args->id, (unsigned char *) rbuf + num, 2072 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2073 num += ATA_ID_SERNO_LEN; 2074 2075 /* SAT defined lu model and serial numbers descriptor */ 2076 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2077 rbuf[num + 0] = 2; 2078 rbuf[num + 1] = 1; 2079 rbuf[num + 3] = sat_model_serial_desc_len; 2080 num += 4; 2081 memcpy(rbuf + num, "ATA ", 8); 2082 num += 8; 2083 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2084 ATA_ID_PROD_LEN); 2085 num += ATA_ID_PROD_LEN; 2086 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2087 ATA_ID_SERNO_LEN); 2088 num += ATA_ID_SERNO_LEN; 2089 2090 if (ata_id_has_wwn(args->id)) { 2091 /* SAT defined lu world wide name */ 2092 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2093 rbuf[num + 0] = 1; 2094 rbuf[num + 1] = 3; 2095 rbuf[num + 3] = ATA_ID_WWN_LEN; 2096 num += 4; 2097 ata_id_string(args->id, (unsigned char *) rbuf + num, 2098 ATA_ID_WWN, ATA_ID_WWN_LEN); 2099 num += ATA_ID_WWN_LEN; 2100 } 2101 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2102 return 0; 2103 } 2104 2105 /** 2106 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2107 * @args: device IDENTIFY data / SCSI command of interest. 2108 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2109 * 2110 * Yields SAT-specified ATA VPD page. 2111 * 2112 * LOCKING: 2113 * spin_lock_irqsave(host lock) 2114 */ 2115 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2116 { 2117 struct ata_taskfile tf; 2118 2119 memset(&tf, 0, sizeof(tf)); 2120 2121 rbuf[1] = 0x89; /* our page code */ 2122 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2123 rbuf[3] = (0x238 & 0xff); 2124 2125 memcpy(&rbuf[8], "linux ", 8); 2126 memcpy(&rbuf[16], "libata ", 16); 2127 memcpy(&rbuf[32], DRV_VERSION, 4); 2128 2129 /* we don't store the ATA device signature, so we fake it */ 2130 2131 tf.command = ATA_DRDY; /* really, this is Status reg */ 2132 tf.lbal = 0x1; 2133 tf.nsect = 0x1; 2134 2135 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2136 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2137 2138 rbuf[56] = ATA_CMD_ID_ATA; 2139 2140 memcpy(&rbuf[60], &args->id[0], 512); 2141 return 0; 2142 } 2143 2144 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2145 { 2146 u16 min_io_sectors; 2147 2148 rbuf[1] = 0xb0; 2149 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2150 2151 /* 2152 * Optimal transfer length granularity. 2153 * 2154 * This is always one physical block, but for disks with a smaller 2155 * logical than physical sector size we need to figure out what the 2156 * latter is. 2157 */ 2158 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2159 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2160 2161 /* 2162 * Optimal unmap granularity. 2163 * 2164 * The ATA spec doesn't even know about a granularity or alignment 2165 * for the TRIM command. We can leave away most of the unmap related 2166 * VPD page entries, but we have specifify a granularity to signal 2167 * that we support some form of unmap - in thise case via WRITE SAME 2168 * with the unmap bit set. 2169 */ 2170 if (ata_id_has_trim(args->id)) { 2171 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2172 put_unaligned_be32(1, &rbuf[28]); 2173 } 2174 2175 return 0; 2176 } 2177 2178 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2179 { 2180 int form_factor = ata_id_form_factor(args->id); 2181 int media_rotation_rate = ata_id_rotation_rate(args->id); 2182 2183 rbuf[1] = 0xb1; 2184 rbuf[3] = 0x3c; 2185 rbuf[4] = media_rotation_rate >> 8; 2186 rbuf[5] = media_rotation_rate; 2187 rbuf[7] = form_factor; 2188 2189 return 0; 2190 } 2191 2192 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2193 { 2194 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2195 rbuf[1] = 0xb2; 2196 rbuf[3] = 0x4; 2197 rbuf[5] = 1 << 6; /* TPWS */ 2198 2199 return 0; 2200 } 2201 2202 /** 2203 * ata_scsiop_noop - Command handler that simply returns success. 2204 * @args: device IDENTIFY data / SCSI command of interest. 2205 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2206 * 2207 * No operation. Simply returns success to caller, to indicate 2208 * that the caller should successfully complete this SCSI command. 2209 * 2210 * LOCKING: 2211 * spin_lock_irqsave(host lock) 2212 */ 2213 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2214 { 2215 VPRINTK("ENTER\n"); 2216 return 0; 2217 } 2218 2219 /** 2220 * modecpy - Prepare response for MODE SENSE 2221 * @dest: output buffer 2222 * @src: data being copied 2223 * @n: length of mode page 2224 * @changeable: whether changeable parameters are requested 2225 * 2226 * Generate a generic MODE SENSE page for either current or changeable 2227 * parameters. 2228 * 2229 * LOCKING: 2230 * None. 2231 */ 2232 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2233 { 2234 if (changeable) { 2235 memcpy(dest, src, 2); 2236 memset(dest + 2, 0, n - 2); 2237 } else { 2238 memcpy(dest, src, n); 2239 } 2240 } 2241 2242 /** 2243 * ata_msense_caching - Simulate MODE SENSE caching info page 2244 * @id: device IDENTIFY data 2245 * @buf: output buffer 2246 * @changeable: whether changeable parameters are requested 2247 * 2248 * Generate a caching info page, which conditionally indicates 2249 * write caching to the SCSI layer, depending on device 2250 * capabilities. 2251 * 2252 * LOCKING: 2253 * None. 2254 */ 2255 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2256 { 2257 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2258 if (changeable || ata_id_wcache_enabled(id)) 2259 buf[2] |= (1 << 2); /* write cache enable */ 2260 if (!changeable && !ata_id_rahead_enabled(id)) 2261 buf[12] |= (1 << 5); /* disable read ahead */ 2262 return sizeof(def_cache_mpage); 2263 } 2264 2265 /** 2266 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2267 * @buf: output buffer 2268 * @changeable: whether changeable parameters are requested 2269 * 2270 * Generate a generic MODE SENSE control mode page. 2271 * 2272 * LOCKING: 2273 * None. 2274 */ 2275 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2276 { 2277 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2278 return sizeof(def_control_mpage); 2279 } 2280 2281 /** 2282 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2283 * @buf: output buffer 2284 * @changeable: whether changeable parameters are requested 2285 * 2286 * Generate a generic MODE SENSE r/w error recovery page. 2287 * 2288 * LOCKING: 2289 * None. 2290 */ 2291 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2292 { 2293 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2294 changeable); 2295 return sizeof(def_rw_recovery_mpage); 2296 } 2297 2298 /* 2299 * We can turn this into a real blacklist if it's needed, for now just 2300 * blacklist any Maxtor BANC1G10 revision firmware 2301 */ 2302 static int ata_dev_supports_fua(u16 *id) 2303 { 2304 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2305 2306 if (!libata_fua) 2307 return 0; 2308 if (!ata_id_has_fua(id)) 2309 return 0; 2310 2311 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2312 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2313 2314 if (strcmp(model, "Maxtor")) 2315 return 1; 2316 if (strcmp(fw, "BANC1G10")) 2317 return 1; 2318 2319 return 0; /* blacklisted */ 2320 } 2321 2322 /** 2323 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2324 * @args: device IDENTIFY data / SCSI command of interest. 2325 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2326 * 2327 * Simulate MODE SENSE commands. Assume this is invoked for direct 2328 * access devices (e.g. disks) only. There should be no block 2329 * descriptor for other device types. 2330 * 2331 * LOCKING: 2332 * spin_lock_irqsave(host lock) 2333 */ 2334 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2335 { 2336 struct ata_device *dev = args->dev; 2337 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2338 const u8 sat_blk_desc[] = { 2339 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2340 0, 2341 0, 0x2, 0x0 /* block length: 512 bytes */ 2342 }; 2343 u8 pg, spg; 2344 unsigned int ebd, page_control, six_byte; 2345 u8 dpofua; 2346 2347 VPRINTK("ENTER\n"); 2348 2349 six_byte = (scsicmd[0] == MODE_SENSE); 2350 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2351 /* 2352 * LLBA bit in msense(10) ignored (compliant) 2353 */ 2354 2355 page_control = scsicmd[2] >> 6; 2356 switch (page_control) { 2357 case 0: /* current */ 2358 case 1: /* changeable */ 2359 case 2: /* defaults */ 2360 break; /* supported */ 2361 case 3: /* saved */ 2362 goto saving_not_supp; 2363 default: 2364 goto invalid_fld; 2365 } 2366 2367 if (six_byte) 2368 p += 4 + (ebd ? 8 : 0); 2369 else 2370 p += 8 + (ebd ? 8 : 0); 2371 2372 pg = scsicmd[2] & 0x3f; 2373 spg = scsicmd[3]; 2374 /* 2375 * No mode subpages supported (yet) but asking for _all_ 2376 * subpages may be valid 2377 */ 2378 if (spg && (spg != ALL_SUB_MPAGES)) 2379 goto invalid_fld; 2380 2381 switch(pg) { 2382 case RW_RECOVERY_MPAGE: 2383 p += ata_msense_rw_recovery(p, page_control == 1); 2384 break; 2385 2386 case CACHE_MPAGE: 2387 p += ata_msense_caching(args->id, p, page_control == 1); 2388 break; 2389 2390 case CONTROL_MPAGE: 2391 p += ata_msense_ctl_mode(p, page_control == 1); 2392 break; 2393 2394 case ALL_MPAGES: 2395 p += ata_msense_rw_recovery(p, page_control == 1); 2396 p += ata_msense_caching(args->id, p, page_control == 1); 2397 p += ata_msense_ctl_mode(p, page_control == 1); 2398 break; 2399 2400 default: /* invalid page code */ 2401 goto invalid_fld; 2402 } 2403 2404 dpofua = 0; 2405 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2406 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2407 dpofua = 1 << 4; 2408 2409 if (six_byte) { 2410 rbuf[0] = p - rbuf - 1; 2411 rbuf[2] |= dpofua; 2412 if (ebd) { 2413 rbuf[3] = sizeof(sat_blk_desc); 2414 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2415 } 2416 } else { 2417 unsigned int output_len = p - rbuf - 2; 2418 2419 rbuf[0] = output_len >> 8; 2420 rbuf[1] = output_len; 2421 rbuf[3] |= dpofua; 2422 if (ebd) { 2423 rbuf[7] = sizeof(sat_blk_desc); 2424 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2425 } 2426 } 2427 return 0; 2428 2429 invalid_fld: 2430 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2431 /* "Invalid field in cbd" */ 2432 return 1; 2433 2434 saving_not_supp: 2435 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2436 /* "Saving parameters not supported" */ 2437 return 1; 2438 } 2439 2440 /** 2441 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2442 * @args: device IDENTIFY data / SCSI command of interest. 2443 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2444 * 2445 * Simulate READ CAPACITY commands. 2446 * 2447 * LOCKING: 2448 * None. 2449 */ 2450 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2451 { 2452 struct ata_device *dev = args->dev; 2453 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2454 u32 sector_size; /* physical sector size in bytes */ 2455 u8 log2_per_phys; 2456 u16 lowest_aligned; 2457 2458 sector_size = ata_id_logical_sector_size(dev->id); 2459 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2460 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2461 2462 VPRINTK("ENTER\n"); 2463 2464 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2465 if (last_lba >= 0xffffffffULL) 2466 last_lba = 0xffffffff; 2467 2468 /* sector count, 32-bit */ 2469 rbuf[0] = last_lba >> (8 * 3); 2470 rbuf[1] = last_lba >> (8 * 2); 2471 rbuf[2] = last_lba >> (8 * 1); 2472 rbuf[3] = last_lba; 2473 2474 /* sector size */ 2475 rbuf[4] = sector_size >> (8 * 3); 2476 rbuf[5] = sector_size >> (8 * 2); 2477 rbuf[6] = sector_size >> (8 * 1); 2478 rbuf[7] = sector_size; 2479 } else { 2480 /* sector count, 64-bit */ 2481 rbuf[0] = last_lba >> (8 * 7); 2482 rbuf[1] = last_lba >> (8 * 6); 2483 rbuf[2] = last_lba >> (8 * 5); 2484 rbuf[3] = last_lba >> (8 * 4); 2485 rbuf[4] = last_lba >> (8 * 3); 2486 rbuf[5] = last_lba >> (8 * 2); 2487 rbuf[6] = last_lba >> (8 * 1); 2488 rbuf[7] = last_lba; 2489 2490 /* sector size */ 2491 rbuf[ 8] = sector_size >> (8 * 3); 2492 rbuf[ 9] = sector_size >> (8 * 2); 2493 rbuf[10] = sector_size >> (8 * 1); 2494 rbuf[11] = sector_size; 2495 2496 rbuf[12] = 0; 2497 rbuf[13] = log2_per_phys; 2498 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2499 rbuf[15] = lowest_aligned; 2500 2501 if (ata_id_has_trim(args->id)) { 2502 rbuf[14] |= 0x80; /* TPE */ 2503 2504 if (ata_id_has_zero_after_trim(args->id)) 2505 rbuf[14] |= 0x40; /* TPRZ */ 2506 } 2507 } 2508 2509 return 0; 2510 } 2511 2512 /** 2513 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2514 * @args: device IDENTIFY data / SCSI command of interest. 2515 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2516 * 2517 * Simulate REPORT LUNS command. 2518 * 2519 * LOCKING: 2520 * spin_lock_irqsave(host lock) 2521 */ 2522 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2523 { 2524 VPRINTK("ENTER\n"); 2525 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2526 2527 return 0; 2528 } 2529 2530 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2531 { 2532 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2533 /* FIXME: not quite right; we don't want the 2534 * translation of taskfile registers into 2535 * a sense descriptors, since that's only 2536 * correct for ATA, not ATAPI 2537 */ 2538 ata_gen_passthru_sense(qc); 2539 } 2540 2541 qc->scsidone(qc->scsicmd); 2542 ata_qc_free(qc); 2543 } 2544 2545 /* is it pointless to prefer PIO for "safety reasons"? */ 2546 static inline int ata_pio_use_silly(struct ata_port *ap) 2547 { 2548 return (ap->flags & ATA_FLAG_PIO_DMA); 2549 } 2550 2551 static void atapi_request_sense(struct ata_queued_cmd *qc) 2552 { 2553 struct ata_port *ap = qc->ap; 2554 struct scsi_cmnd *cmd = qc->scsicmd; 2555 2556 DPRINTK("ATAPI request sense\n"); 2557 2558 /* FIXME: is this needed? */ 2559 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2560 2561 #ifdef CONFIG_ATA_SFF 2562 if (ap->ops->sff_tf_read) 2563 ap->ops->sff_tf_read(ap, &qc->tf); 2564 #endif 2565 2566 /* fill these in, for the case where they are -not- overwritten */ 2567 cmd->sense_buffer[0] = 0x70; 2568 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2569 2570 ata_qc_reinit(qc); 2571 2572 /* setup sg table and init transfer direction */ 2573 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2574 ata_sg_init(qc, &qc->sgent, 1); 2575 qc->dma_dir = DMA_FROM_DEVICE; 2576 2577 memset(&qc->cdb, 0, qc->dev->cdb_len); 2578 qc->cdb[0] = REQUEST_SENSE; 2579 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2580 2581 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2582 qc->tf.command = ATA_CMD_PACKET; 2583 2584 if (ata_pio_use_silly(ap)) { 2585 qc->tf.protocol = ATAPI_PROT_DMA; 2586 qc->tf.feature |= ATAPI_PKT_DMA; 2587 } else { 2588 qc->tf.protocol = ATAPI_PROT_PIO; 2589 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2590 qc->tf.lbah = 0; 2591 } 2592 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2593 2594 qc->complete_fn = atapi_sense_complete; 2595 2596 ata_qc_issue(qc); 2597 2598 DPRINTK("EXIT\n"); 2599 } 2600 2601 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2602 { 2603 struct scsi_cmnd *cmd = qc->scsicmd; 2604 unsigned int err_mask = qc->err_mask; 2605 2606 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2607 2608 /* handle completion from new EH */ 2609 if (unlikely(qc->ap->ops->error_handler && 2610 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2611 2612 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2613 /* FIXME: not quite right; we don't want the 2614 * translation of taskfile registers into a 2615 * sense descriptors, since that's only 2616 * correct for ATA, not ATAPI 2617 */ 2618 ata_gen_passthru_sense(qc); 2619 } 2620 2621 /* SCSI EH automatically locks door if sdev->locked is 2622 * set. Sometimes door lock request continues to 2623 * fail, for example, when no media is present. This 2624 * creates a loop - SCSI EH issues door lock which 2625 * fails and gets invoked again to acquire sense data 2626 * for the failed command. 2627 * 2628 * If door lock fails, always clear sdev->locked to 2629 * avoid this infinite loop. 2630 * 2631 * This may happen before SCSI scan is complete. Make 2632 * sure qc->dev->sdev isn't NULL before dereferencing. 2633 */ 2634 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2635 qc->dev->sdev->locked = 0; 2636 2637 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2638 qc->scsidone(cmd); 2639 ata_qc_free(qc); 2640 return; 2641 } 2642 2643 /* successful completion or old EH failure path */ 2644 if (unlikely(err_mask & AC_ERR_DEV)) { 2645 cmd->result = SAM_STAT_CHECK_CONDITION; 2646 atapi_request_sense(qc); 2647 return; 2648 } else if (unlikely(err_mask)) { 2649 /* FIXME: not quite right; we don't want the 2650 * translation of taskfile registers into 2651 * a sense descriptors, since that's only 2652 * correct for ATA, not ATAPI 2653 */ 2654 ata_gen_passthru_sense(qc); 2655 } else { 2656 u8 *scsicmd = cmd->cmnd; 2657 2658 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2659 unsigned long flags; 2660 u8 *buf; 2661 2662 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2663 2664 /* ATAPI devices typically report zero for their SCSI version, 2665 * and sometimes deviate from the spec WRT response data 2666 * format. If SCSI version is reported as zero like normal, 2667 * then we make the following fixups: 1) Fake MMC-5 version, 2668 * to indicate to the Linux scsi midlayer this is a modern 2669 * device. 2) Ensure response data format / ATAPI information 2670 * are always correct. 2671 */ 2672 if (buf[2] == 0) { 2673 buf[2] = 0x5; 2674 buf[3] = 0x32; 2675 } 2676 2677 ata_scsi_rbuf_put(cmd, true, &flags); 2678 } 2679 2680 cmd->result = SAM_STAT_GOOD; 2681 } 2682 2683 qc->scsidone(cmd); 2684 ata_qc_free(qc); 2685 } 2686 /** 2687 * atapi_xlat - Initialize PACKET taskfile 2688 * @qc: command structure to be initialized 2689 * 2690 * LOCKING: 2691 * spin_lock_irqsave(host lock) 2692 * 2693 * RETURNS: 2694 * Zero on success, non-zero on failure. 2695 */ 2696 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2697 { 2698 struct scsi_cmnd *scmd = qc->scsicmd; 2699 struct ata_device *dev = qc->dev; 2700 int nodata = (scmd->sc_data_direction == DMA_NONE); 2701 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2702 unsigned int nbytes; 2703 2704 memset(qc->cdb, 0, dev->cdb_len); 2705 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2706 2707 qc->complete_fn = atapi_qc_complete; 2708 2709 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2710 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2711 qc->tf.flags |= ATA_TFLAG_WRITE; 2712 DPRINTK("direction: write\n"); 2713 } 2714 2715 qc->tf.command = ATA_CMD_PACKET; 2716 ata_qc_set_pc_nbytes(qc); 2717 2718 /* check whether ATAPI DMA is safe */ 2719 if (!nodata && !using_pio && atapi_check_dma(qc)) 2720 using_pio = 1; 2721 2722 /* Some controller variants snoop this value for Packet 2723 * transfers to do state machine and FIFO management. Thus we 2724 * want to set it properly, and for DMA where it is 2725 * effectively meaningless. 2726 */ 2727 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2728 2729 /* Most ATAPI devices which honor transfer chunk size don't 2730 * behave according to the spec when odd chunk size which 2731 * matches the transfer length is specified. If the number of 2732 * bytes to transfer is 2n+1. According to the spec, what 2733 * should happen is to indicate that 2n+1 is going to be 2734 * transferred and transfer 2n+2 bytes where the last byte is 2735 * padding. 2736 * 2737 * In practice, this doesn't happen. ATAPI devices first 2738 * indicate and transfer 2n bytes and then indicate and 2739 * transfer 2 bytes where the last byte is padding. 2740 * 2741 * This inconsistency confuses several controllers which 2742 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2743 * These controllers use actual number of transferred bytes to 2744 * update DMA poitner and transfer of 4n+2 bytes make those 2745 * controller push DMA pointer by 4n+4 bytes because SATA data 2746 * FISes are aligned to 4 bytes. This causes data corruption 2747 * and buffer overrun. 2748 * 2749 * Always setting nbytes to even number solves this problem 2750 * because then ATAPI devices don't have to split data at 2n 2751 * boundaries. 2752 */ 2753 if (nbytes & 0x1) 2754 nbytes++; 2755 2756 qc->tf.lbam = (nbytes & 0xFF); 2757 qc->tf.lbah = (nbytes >> 8); 2758 2759 if (nodata) 2760 qc->tf.protocol = ATAPI_PROT_NODATA; 2761 else if (using_pio) 2762 qc->tf.protocol = ATAPI_PROT_PIO; 2763 else { 2764 /* DMA data xfer */ 2765 qc->tf.protocol = ATAPI_PROT_DMA; 2766 qc->tf.feature |= ATAPI_PKT_DMA; 2767 2768 if ((dev->flags & ATA_DFLAG_DMADIR) && 2769 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2770 /* some SATA bridges need us to indicate data xfer direction */ 2771 qc->tf.feature |= ATAPI_DMADIR; 2772 } 2773 2774 2775 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2776 as ATAPI tape drives don't get this right otherwise */ 2777 return 0; 2778 } 2779 2780 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2781 { 2782 if (!sata_pmp_attached(ap)) { 2783 if (likely(devno < ata_link_max_devices(&ap->link))) 2784 return &ap->link.device[devno]; 2785 } else { 2786 if (likely(devno < ap->nr_pmp_links)) 2787 return &ap->pmp_link[devno].device[0]; 2788 } 2789 2790 return NULL; 2791 } 2792 2793 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2794 const struct scsi_device *scsidev) 2795 { 2796 int devno; 2797 2798 /* skip commands not addressed to targets we simulate */ 2799 if (!sata_pmp_attached(ap)) { 2800 if (unlikely(scsidev->channel || scsidev->lun)) 2801 return NULL; 2802 devno = scsidev->id; 2803 } else { 2804 if (unlikely(scsidev->id || scsidev->lun)) 2805 return NULL; 2806 devno = scsidev->channel; 2807 } 2808 2809 return ata_find_dev(ap, devno); 2810 } 2811 2812 /** 2813 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2814 * @ap: ATA port to which the device is attached 2815 * @scsidev: SCSI device from which we derive the ATA device 2816 * 2817 * Given various information provided in struct scsi_cmnd, 2818 * map that onto an ATA bus, and using that mapping 2819 * determine which ata_device is associated with the 2820 * SCSI command to be sent. 2821 * 2822 * LOCKING: 2823 * spin_lock_irqsave(host lock) 2824 * 2825 * RETURNS: 2826 * Associated ATA device, or %NULL if not found. 2827 */ 2828 static struct ata_device * 2829 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2830 { 2831 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2832 2833 if (unlikely(!dev || !ata_dev_enabled(dev))) 2834 return NULL; 2835 2836 return dev; 2837 } 2838 2839 /* 2840 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2841 * @byte1: Byte 1 from pass-thru CDB. 2842 * 2843 * RETURNS: 2844 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2845 */ 2846 static u8 2847 ata_scsi_map_proto(u8 byte1) 2848 { 2849 switch((byte1 & 0x1e) >> 1) { 2850 case 3: /* Non-data */ 2851 return ATA_PROT_NODATA; 2852 2853 case 6: /* DMA */ 2854 case 10: /* UDMA Data-in */ 2855 case 11: /* UDMA Data-Out */ 2856 return ATA_PROT_DMA; 2857 2858 case 4: /* PIO Data-in */ 2859 case 5: /* PIO Data-out */ 2860 return ATA_PROT_PIO; 2861 2862 case 0: /* Hard Reset */ 2863 case 1: /* SRST */ 2864 case 8: /* Device Diagnostic */ 2865 case 9: /* Device Reset */ 2866 case 7: /* DMA Queued */ 2867 case 12: /* FPDMA */ 2868 case 15: /* Return Response Info */ 2869 default: /* Reserved */ 2870 break; 2871 } 2872 2873 return ATA_PROT_UNKNOWN; 2874 } 2875 2876 /** 2877 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2878 * @qc: command structure to be initialized 2879 * 2880 * Handles either 12 or 16-byte versions of the CDB. 2881 * 2882 * RETURNS: 2883 * Zero on success, non-zero on failure. 2884 */ 2885 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2886 { 2887 struct ata_taskfile *tf = &(qc->tf); 2888 struct scsi_cmnd *scmd = qc->scsicmd; 2889 struct ata_device *dev = qc->dev; 2890 const u8 *cdb = scmd->cmnd; 2891 2892 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2893 goto invalid_fld; 2894 2895 /* 2896 * 12 and 16 byte CDBs use different offsets to 2897 * provide the various register values. 2898 */ 2899 if (cdb[0] == ATA_16) { 2900 /* 2901 * 16-byte CDB - may contain extended commands. 2902 * 2903 * If that is the case, copy the upper byte register values. 2904 */ 2905 if (cdb[1] & 0x01) { 2906 tf->hob_feature = cdb[3]; 2907 tf->hob_nsect = cdb[5]; 2908 tf->hob_lbal = cdb[7]; 2909 tf->hob_lbam = cdb[9]; 2910 tf->hob_lbah = cdb[11]; 2911 tf->flags |= ATA_TFLAG_LBA48; 2912 } else 2913 tf->flags &= ~ATA_TFLAG_LBA48; 2914 2915 /* 2916 * Always copy low byte, device and command registers. 2917 */ 2918 tf->feature = cdb[4]; 2919 tf->nsect = cdb[6]; 2920 tf->lbal = cdb[8]; 2921 tf->lbam = cdb[10]; 2922 tf->lbah = cdb[12]; 2923 tf->device = cdb[13]; 2924 tf->command = cdb[14]; 2925 } else { 2926 /* 2927 * 12-byte CDB - incapable of extended commands. 2928 */ 2929 tf->flags &= ~ATA_TFLAG_LBA48; 2930 2931 tf->feature = cdb[3]; 2932 tf->nsect = cdb[4]; 2933 tf->lbal = cdb[5]; 2934 tf->lbam = cdb[6]; 2935 tf->lbah = cdb[7]; 2936 tf->device = cdb[8]; 2937 tf->command = cdb[9]; 2938 } 2939 2940 /* enforce correct master/slave bit */ 2941 tf->device = dev->devno ? 2942 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2943 2944 switch (tf->command) { 2945 /* READ/WRITE LONG use a non-standard sect_size */ 2946 case ATA_CMD_READ_LONG: 2947 case ATA_CMD_READ_LONG_ONCE: 2948 case ATA_CMD_WRITE_LONG: 2949 case ATA_CMD_WRITE_LONG_ONCE: 2950 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2951 goto invalid_fld; 2952 qc->sect_size = scsi_bufflen(scmd); 2953 break; 2954 2955 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2956 case ATA_CMD_CFA_WRITE_NE: 2957 case ATA_CMD_CFA_TRANS_SECT: 2958 case ATA_CMD_CFA_WRITE_MULT_NE: 2959 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2960 case ATA_CMD_READ: 2961 case ATA_CMD_READ_EXT: 2962 case ATA_CMD_READ_QUEUED: 2963 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2964 case ATA_CMD_FPDMA_READ: 2965 case ATA_CMD_READ_MULTI: 2966 case ATA_CMD_READ_MULTI_EXT: 2967 case ATA_CMD_PIO_READ: 2968 case ATA_CMD_PIO_READ_EXT: 2969 case ATA_CMD_READ_STREAM_DMA_EXT: 2970 case ATA_CMD_READ_STREAM_EXT: 2971 case ATA_CMD_VERIFY: 2972 case ATA_CMD_VERIFY_EXT: 2973 case ATA_CMD_WRITE: 2974 case ATA_CMD_WRITE_EXT: 2975 case ATA_CMD_WRITE_FUA_EXT: 2976 case ATA_CMD_WRITE_QUEUED: 2977 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2978 case ATA_CMD_FPDMA_WRITE: 2979 case ATA_CMD_WRITE_MULTI: 2980 case ATA_CMD_WRITE_MULTI_EXT: 2981 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2982 case ATA_CMD_PIO_WRITE: 2983 case ATA_CMD_PIO_WRITE_EXT: 2984 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2985 case ATA_CMD_WRITE_STREAM_EXT: 2986 qc->sect_size = scmd->device->sector_size; 2987 break; 2988 2989 /* Everything else uses 512 byte "sectors" */ 2990 default: 2991 qc->sect_size = ATA_SECT_SIZE; 2992 } 2993 2994 /* 2995 * Set flags so that all registers will be written, pass on 2996 * write indication (used for PIO/DMA setup), result TF is 2997 * copied back and we don't whine too much about its failure. 2998 */ 2999 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3000 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3001 tf->flags |= ATA_TFLAG_WRITE; 3002 3003 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3004 3005 /* 3006 * Set transfer length. 3007 * 3008 * TODO: find out if we need to do more here to 3009 * cover scatter/gather case. 3010 */ 3011 ata_qc_set_pc_nbytes(qc); 3012 3013 /* We may not issue DMA commands if no DMA mode is set */ 3014 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3015 goto invalid_fld; 3016 3017 /* sanity check for pio multi commands */ 3018 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3019 goto invalid_fld; 3020 3021 if (is_multi_taskfile(tf)) { 3022 unsigned int multi_count = 1 << (cdb[1] >> 5); 3023 3024 /* compare the passed through multi_count 3025 * with the cached multi_count of libata 3026 */ 3027 if (multi_count != dev->multi_count) 3028 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3029 multi_count); 3030 } 3031 3032 /* 3033 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3034 * SET_FEATURES - XFER MODE must be preceded/succeeded 3035 * by an update to hardware-specific registers for each 3036 * controller (i.e. the reason for ->set_piomode(), 3037 * ->set_dmamode(), and ->post_set_mode() hooks). 3038 */ 3039 if (tf->command == ATA_CMD_SET_FEATURES && 3040 tf->feature == SETFEATURES_XFER) 3041 goto invalid_fld; 3042 3043 /* 3044 * Filter TPM commands by default. These provide an 3045 * essentially uncontrolled encrypted "back door" between 3046 * applications and the disk. Set libata.allow_tpm=1 if you 3047 * have a real reason for wanting to use them. This ensures 3048 * that installed software cannot easily mess stuff up without 3049 * user intent. DVR type users will probably ship with this enabled 3050 * for movie content management. 3051 * 3052 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3053 * for this and should do in future but that it is not sufficient as 3054 * DCS is an optional feature set. Thus we also do the software filter 3055 * so that we comply with the TC consortium stated goal that the user 3056 * can turn off TC features of their system. 3057 */ 3058 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3059 goto invalid_fld; 3060 3061 return 0; 3062 3063 invalid_fld: 3064 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3065 /* "Invalid field in cdb" */ 3066 return 1; 3067 } 3068 3069 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3070 { 3071 struct ata_taskfile *tf = &qc->tf; 3072 struct scsi_cmnd *scmd = qc->scsicmd; 3073 struct ata_device *dev = qc->dev; 3074 const u8 *cdb = scmd->cmnd; 3075 u64 block; 3076 u32 n_block; 3077 u32 size; 3078 void *buf; 3079 3080 /* we may not issue DMA commands if no DMA mode is set */ 3081 if (unlikely(!dev->dma_mode)) 3082 goto invalid_fld; 3083 3084 if (unlikely(scmd->cmd_len < 16)) 3085 goto invalid_fld; 3086 scsi_16_lba_len(cdb, &block, &n_block); 3087 3088 /* for now we only support WRITE SAME with the unmap bit set */ 3089 if (unlikely(!(cdb[1] & 0x8))) 3090 goto invalid_fld; 3091 3092 /* 3093 * WRITE SAME always has a sector sized buffer as payload, this 3094 * should never be a multiple entry S/G list. 3095 */ 3096 if (!scsi_sg_count(scmd)) 3097 goto invalid_fld; 3098 3099 buf = page_address(sg_page(scsi_sglist(scmd))); 3100 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3101 3102 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { 3103 /* Newer devices support queued TRIM commands */ 3104 tf->protocol = ATA_PROT_NCQ; 3105 tf->command = ATA_CMD_FPDMA_SEND; 3106 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f; 3107 tf->nsect = qc->tag << 3; 3108 tf->hob_feature = (size / 512) >> 8; 3109 tf->feature = size / 512; 3110 3111 tf->auxiliary = 1; 3112 } else { 3113 tf->protocol = ATA_PROT_DMA; 3114 tf->hob_feature = 0; 3115 tf->feature = ATA_DSM_TRIM; 3116 tf->hob_nsect = (size / 512) >> 8; 3117 tf->nsect = size / 512; 3118 tf->command = ATA_CMD_DSM; 3119 } 3120 3121 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3122 ATA_TFLAG_WRITE; 3123 3124 ata_qc_set_pc_nbytes(qc); 3125 3126 return 0; 3127 3128 invalid_fld: 3129 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3130 /* "Invalid field in cdb" */ 3131 return 1; 3132 } 3133 3134 /** 3135 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3136 * @qc: Storage for translated ATA taskfile 3137 * @buf: input buffer 3138 * @len: number of valid bytes in the input buffer 3139 * 3140 * Prepare a taskfile to modify caching information for the device. 3141 * 3142 * LOCKING: 3143 * None. 3144 */ 3145 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3146 const u8 *buf, int len) 3147 { 3148 struct ata_taskfile *tf = &qc->tf; 3149 struct ata_device *dev = qc->dev; 3150 char mpage[CACHE_MPAGE_LEN]; 3151 u8 wce; 3152 3153 /* 3154 * The first two bytes of def_cache_mpage are a header, so offsets 3155 * in mpage are off by 2 compared to buf. Same for len. 3156 */ 3157 3158 if (len != CACHE_MPAGE_LEN - 2) 3159 return -EINVAL; 3160 3161 wce = buf[0] & (1 << 2); 3162 3163 /* 3164 * Check that read-only bits are not modified. 3165 */ 3166 ata_msense_caching(dev->id, mpage, false); 3167 mpage[2] &= ~(1 << 2); 3168 mpage[2] |= wce; 3169 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3170 return -EINVAL; 3171 3172 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3173 tf->protocol = ATA_PROT_NODATA; 3174 tf->nsect = 0; 3175 tf->command = ATA_CMD_SET_FEATURES; 3176 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3177 return 0; 3178 } 3179 3180 /** 3181 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3182 * @qc: Storage for translated ATA taskfile 3183 * 3184 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3185 * Assume this is invoked for direct access devices (e.g. disks) only. 3186 * There should be no block descriptor for other device types. 3187 * 3188 * LOCKING: 3189 * spin_lock_irqsave(host lock) 3190 */ 3191 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3192 { 3193 struct scsi_cmnd *scmd = qc->scsicmd; 3194 const u8 *cdb = scmd->cmnd; 3195 const u8 *p; 3196 u8 pg, spg; 3197 unsigned six_byte, pg_len, hdr_len, bd_len; 3198 int len; 3199 3200 VPRINTK("ENTER\n"); 3201 3202 six_byte = (cdb[0] == MODE_SELECT); 3203 if (six_byte) { 3204 if (scmd->cmd_len < 5) 3205 goto invalid_fld; 3206 3207 len = cdb[4]; 3208 hdr_len = 4; 3209 } else { 3210 if (scmd->cmd_len < 9) 3211 goto invalid_fld; 3212 3213 len = (cdb[7] << 8) + cdb[8]; 3214 hdr_len = 8; 3215 } 3216 3217 /* We only support PF=1, SP=0. */ 3218 if ((cdb[1] & 0x11) != 0x10) 3219 goto invalid_fld; 3220 3221 /* Test early for possible overrun. */ 3222 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3223 goto invalid_param_len; 3224 3225 p = page_address(sg_page(scsi_sglist(scmd))); 3226 3227 /* Move past header and block descriptors. */ 3228 if (len < hdr_len) 3229 goto invalid_param_len; 3230 3231 if (six_byte) 3232 bd_len = p[3]; 3233 else 3234 bd_len = (p[6] << 8) + p[7]; 3235 3236 len -= hdr_len; 3237 p += hdr_len; 3238 if (len < bd_len) 3239 goto invalid_param_len; 3240 if (bd_len != 0 && bd_len != 8) 3241 goto invalid_param; 3242 3243 len -= bd_len; 3244 p += bd_len; 3245 if (len == 0) 3246 goto skip; 3247 3248 /* Parse both possible formats for the mode page headers. */ 3249 pg = p[0] & 0x3f; 3250 if (p[0] & 0x40) { 3251 if (len < 4) 3252 goto invalid_param_len; 3253 3254 spg = p[1]; 3255 pg_len = (p[2] << 8) | p[3]; 3256 p += 4; 3257 len -= 4; 3258 } else { 3259 if (len < 2) 3260 goto invalid_param_len; 3261 3262 spg = 0; 3263 pg_len = p[1]; 3264 p += 2; 3265 len -= 2; 3266 } 3267 3268 /* 3269 * No mode subpages supported (yet) but asking for _all_ 3270 * subpages may be valid 3271 */ 3272 if (spg && (spg != ALL_SUB_MPAGES)) 3273 goto invalid_param; 3274 if (pg_len > len) 3275 goto invalid_param_len; 3276 3277 switch (pg) { 3278 case CACHE_MPAGE: 3279 if (ata_mselect_caching(qc, p, pg_len) < 0) 3280 goto invalid_param; 3281 break; 3282 3283 default: /* invalid page code */ 3284 goto invalid_param; 3285 } 3286 3287 /* 3288 * Only one page has changeable data, so we only support setting one 3289 * page at a time. 3290 */ 3291 if (len > pg_len) 3292 goto invalid_param; 3293 3294 return 0; 3295 3296 invalid_fld: 3297 /* "Invalid field in CDB" */ 3298 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3299 return 1; 3300 3301 invalid_param: 3302 /* "Invalid field in parameter list" */ 3303 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3304 return 1; 3305 3306 invalid_param_len: 3307 /* "Parameter list length error" */ 3308 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3309 return 1; 3310 3311 skip: 3312 scmd->result = SAM_STAT_GOOD; 3313 return 1; 3314 } 3315 3316 /** 3317 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3318 * @dev: ATA device 3319 * @cmd: SCSI command opcode to consider 3320 * 3321 * Look up the SCSI command given, and determine whether the 3322 * SCSI command is to be translated or simulated. 3323 * 3324 * RETURNS: 3325 * Pointer to translation function if possible, %NULL if not. 3326 */ 3327 3328 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3329 { 3330 switch (cmd) { 3331 case READ_6: 3332 case READ_10: 3333 case READ_16: 3334 3335 case WRITE_6: 3336 case WRITE_10: 3337 case WRITE_16: 3338 return ata_scsi_rw_xlat; 3339 3340 case WRITE_SAME_16: 3341 return ata_scsi_write_same_xlat; 3342 3343 case SYNCHRONIZE_CACHE: 3344 if (ata_try_flush_cache(dev)) 3345 return ata_scsi_flush_xlat; 3346 break; 3347 3348 case VERIFY: 3349 case VERIFY_16: 3350 return ata_scsi_verify_xlat; 3351 3352 case ATA_12: 3353 case ATA_16: 3354 return ata_scsi_pass_thru; 3355 3356 case MODE_SELECT: 3357 case MODE_SELECT_10: 3358 return ata_scsi_mode_select_xlat; 3359 break; 3360 3361 case START_STOP: 3362 return ata_scsi_start_stop_xlat; 3363 } 3364 3365 return NULL; 3366 } 3367 3368 /** 3369 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3370 * @ap: ATA port to which the command was being sent 3371 * @cmd: SCSI command to dump 3372 * 3373 * Prints the contents of a SCSI command via printk(). 3374 */ 3375 3376 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3377 struct scsi_cmnd *cmd) 3378 { 3379 #ifdef ATA_DEBUG 3380 struct scsi_device *scsidev = cmd->device; 3381 u8 *scsicmd = cmd->cmnd; 3382 3383 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3384 ap->print_id, 3385 scsidev->channel, scsidev->id, scsidev->lun, 3386 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3387 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3388 scsicmd[8]); 3389 #endif 3390 } 3391 3392 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3393 struct ata_device *dev) 3394 { 3395 u8 scsi_op = scmd->cmnd[0]; 3396 ata_xlat_func_t xlat_func; 3397 int rc = 0; 3398 3399 if (dev->class == ATA_DEV_ATA) { 3400 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3401 goto bad_cdb_len; 3402 3403 xlat_func = ata_get_xlat_func(dev, scsi_op); 3404 } else { 3405 if (unlikely(!scmd->cmd_len)) 3406 goto bad_cdb_len; 3407 3408 xlat_func = NULL; 3409 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3410 /* relay SCSI command to ATAPI device */ 3411 int len = COMMAND_SIZE(scsi_op); 3412 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3413 goto bad_cdb_len; 3414 3415 xlat_func = atapi_xlat; 3416 } else { 3417 /* ATA_16 passthru, treat as an ATA command */ 3418 if (unlikely(scmd->cmd_len > 16)) 3419 goto bad_cdb_len; 3420 3421 xlat_func = ata_get_xlat_func(dev, scsi_op); 3422 } 3423 } 3424 3425 if (xlat_func) 3426 rc = ata_scsi_translate(dev, scmd, xlat_func); 3427 else 3428 ata_scsi_simulate(dev, scmd); 3429 3430 return rc; 3431 3432 bad_cdb_len: 3433 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3434 scmd->cmd_len, scsi_op, dev->cdb_len); 3435 scmd->result = DID_ERROR << 16; 3436 scmd->scsi_done(scmd); 3437 return 0; 3438 } 3439 3440 /** 3441 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3442 * @shost: SCSI host of command to be sent 3443 * @cmd: SCSI command to be sent 3444 * 3445 * In some cases, this function translates SCSI commands into 3446 * ATA taskfiles, and queues the taskfiles to be sent to 3447 * hardware. In other cases, this function simulates a 3448 * SCSI device by evaluating and responding to certain 3449 * SCSI commands. This creates the overall effect of 3450 * ATA and ATAPI devices appearing as SCSI devices. 3451 * 3452 * LOCKING: 3453 * ATA host lock 3454 * 3455 * RETURNS: 3456 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3457 * 0 otherwise. 3458 */ 3459 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3460 { 3461 struct ata_port *ap; 3462 struct ata_device *dev; 3463 struct scsi_device *scsidev = cmd->device; 3464 int rc = 0; 3465 unsigned long irq_flags; 3466 3467 ap = ata_shost_to_port(shost); 3468 3469 spin_lock_irqsave(ap->lock, irq_flags); 3470 3471 ata_scsi_dump_cdb(ap, cmd); 3472 3473 dev = ata_scsi_find_dev(ap, scsidev); 3474 if (likely(dev)) 3475 rc = __ata_scsi_queuecmd(cmd, dev); 3476 else { 3477 cmd->result = (DID_BAD_TARGET << 16); 3478 cmd->scsi_done(cmd); 3479 } 3480 3481 spin_unlock_irqrestore(ap->lock, irq_flags); 3482 3483 return rc; 3484 } 3485 3486 /** 3487 * ata_scsi_simulate - simulate SCSI command on ATA device 3488 * @dev: the target device 3489 * @cmd: SCSI command being sent to device. 3490 * 3491 * Interprets and directly executes a select list of SCSI commands 3492 * that can be handled internally. 3493 * 3494 * LOCKING: 3495 * spin_lock_irqsave(host lock) 3496 */ 3497 3498 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3499 { 3500 struct ata_scsi_args args; 3501 const u8 *scsicmd = cmd->cmnd; 3502 u8 tmp8; 3503 3504 args.dev = dev; 3505 args.id = dev->id; 3506 args.cmd = cmd; 3507 args.done = cmd->scsi_done; 3508 3509 switch(scsicmd[0]) { 3510 /* TODO: worth improving? */ 3511 case FORMAT_UNIT: 3512 ata_scsi_invalid_field(cmd); 3513 break; 3514 3515 case INQUIRY: 3516 if (scsicmd[1] & 2) /* is CmdDt set? */ 3517 ata_scsi_invalid_field(cmd); 3518 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3519 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3520 else switch (scsicmd[2]) { 3521 case 0x00: 3522 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3523 break; 3524 case 0x80: 3525 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3526 break; 3527 case 0x83: 3528 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3529 break; 3530 case 0x89: 3531 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3532 break; 3533 case 0xb0: 3534 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3535 break; 3536 case 0xb1: 3537 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3538 break; 3539 case 0xb2: 3540 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3541 break; 3542 default: 3543 ata_scsi_invalid_field(cmd); 3544 break; 3545 } 3546 break; 3547 3548 case MODE_SENSE: 3549 case MODE_SENSE_10: 3550 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3551 break; 3552 3553 case READ_CAPACITY: 3554 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3555 break; 3556 3557 case SERVICE_ACTION_IN: 3558 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3559 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3560 else 3561 ata_scsi_invalid_field(cmd); 3562 break; 3563 3564 case REPORT_LUNS: 3565 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3566 break; 3567 3568 case REQUEST_SENSE: 3569 ata_scsi_set_sense(cmd, 0, 0, 0); 3570 cmd->result = (DRIVER_SENSE << 24); 3571 cmd->scsi_done(cmd); 3572 break; 3573 3574 /* if we reach this, then writeback caching is disabled, 3575 * turning this into a no-op. 3576 */ 3577 case SYNCHRONIZE_CACHE: 3578 /* fall through */ 3579 3580 /* no-op's, complete with success */ 3581 case REZERO_UNIT: 3582 case SEEK_6: 3583 case SEEK_10: 3584 case TEST_UNIT_READY: 3585 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3586 break; 3587 3588 case SEND_DIAGNOSTIC: 3589 tmp8 = scsicmd[1] & ~(1 << 3); 3590 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3591 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3592 else 3593 ata_scsi_invalid_field(cmd); 3594 break; 3595 3596 /* all other commands */ 3597 default: 3598 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3599 /* "Invalid command operation code" */ 3600 cmd->scsi_done(cmd); 3601 break; 3602 } 3603 } 3604 3605 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3606 { 3607 int i, rc; 3608 3609 for (i = 0; i < host->n_ports; i++) { 3610 struct ata_port *ap = host->ports[i]; 3611 struct Scsi_Host *shost; 3612 3613 rc = -ENOMEM; 3614 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3615 if (!shost) 3616 goto err_alloc; 3617 3618 shost->eh_noresume = 1; 3619 *(struct ata_port **)&shost->hostdata[0] = ap; 3620 ap->scsi_host = shost; 3621 3622 shost->transportt = ata_scsi_transport_template; 3623 shost->unique_id = ap->print_id; 3624 shost->max_id = 16; 3625 shost->max_lun = 1; 3626 shost->max_channel = 1; 3627 shost->max_cmd_len = 16; 3628 3629 /* Schedule policy is determined by ->qc_defer() 3630 * callback and it needs to see every deferred qc. 3631 * Set host_blocked to 1 to prevent SCSI midlayer from 3632 * automatically deferring requests. 3633 */ 3634 shost->max_host_blocked = 1; 3635 3636 rc = scsi_add_host_with_dma(ap->scsi_host, 3637 &ap->tdev, ap->host->dev); 3638 if (rc) 3639 goto err_add; 3640 } 3641 3642 return 0; 3643 3644 err_add: 3645 scsi_host_put(host->ports[i]->scsi_host); 3646 err_alloc: 3647 while (--i >= 0) { 3648 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3649 3650 scsi_remove_host(shost); 3651 scsi_host_put(shost); 3652 } 3653 return rc; 3654 } 3655 3656 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3657 { 3658 int tries = 5; 3659 struct ata_device *last_failed_dev = NULL; 3660 struct ata_link *link; 3661 struct ata_device *dev; 3662 3663 repeat: 3664 ata_for_each_link(link, ap, EDGE) { 3665 ata_for_each_dev(dev, link, ENABLED) { 3666 struct scsi_device *sdev; 3667 int channel = 0, id = 0; 3668 3669 if (dev->sdev) 3670 continue; 3671 3672 if (ata_is_host_link(link)) 3673 id = dev->devno; 3674 else 3675 channel = link->pmp; 3676 3677 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3678 NULL); 3679 if (!IS_ERR(sdev)) { 3680 dev->sdev = sdev; 3681 scsi_device_put(sdev); 3682 } else { 3683 dev->sdev = NULL; 3684 } 3685 } 3686 } 3687 3688 /* If we scanned while EH was in progress or allocation 3689 * failure occurred, scan would have failed silently. Check 3690 * whether all devices are attached. 3691 */ 3692 ata_for_each_link(link, ap, EDGE) { 3693 ata_for_each_dev(dev, link, ENABLED) { 3694 if (!dev->sdev) 3695 goto exit_loop; 3696 } 3697 } 3698 exit_loop: 3699 if (!link) 3700 return; 3701 3702 /* we're missing some SCSI devices */ 3703 if (sync) { 3704 /* If caller requested synchrnous scan && we've made 3705 * any progress, sleep briefly and repeat. 3706 */ 3707 if (dev != last_failed_dev) { 3708 msleep(100); 3709 last_failed_dev = dev; 3710 goto repeat; 3711 } 3712 3713 /* We might be failing to detect boot device, give it 3714 * a few more chances. 3715 */ 3716 if (--tries) { 3717 msleep(100); 3718 goto repeat; 3719 } 3720 3721 ata_port_err(ap, 3722 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3723 } 3724 3725 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3726 round_jiffies_relative(HZ)); 3727 } 3728 3729 /** 3730 * ata_scsi_offline_dev - offline attached SCSI device 3731 * @dev: ATA device to offline attached SCSI device for 3732 * 3733 * This function is called from ata_eh_hotplug() and responsible 3734 * for taking the SCSI device attached to @dev offline. This 3735 * function is called with host lock which protects dev->sdev 3736 * against clearing. 3737 * 3738 * LOCKING: 3739 * spin_lock_irqsave(host lock) 3740 * 3741 * RETURNS: 3742 * 1 if attached SCSI device exists, 0 otherwise. 3743 */ 3744 int ata_scsi_offline_dev(struct ata_device *dev) 3745 { 3746 if (dev->sdev) { 3747 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3748 return 1; 3749 } 3750 return 0; 3751 } 3752 3753 /** 3754 * ata_scsi_remove_dev - remove attached SCSI device 3755 * @dev: ATA device to remove attached SCSI device for 3756 * 3757 * This function is called from ata_eh_scsi_hotplug() and 3758 * responsible for removing the SCSI device attached to @dev. 3759 * 3760 * LOCKING: 3761 * Kernel thread context (may sleep). 3762 */ 3763 static void ata_scsi_remove_dev(struct ata_device *dev) 3764 { 3765 struct ata_port *ap = dev->link->ap; 3766 struct scsi_device *sdev; 3767 unsigned long flags; 3768 3769 /* Alas, we need to grab scan_mutex to ensure SCSI device 3770 * state doesn't change underneath us and thus 3771 * scsi_device_get() always succeeds. The mutex locking can 3772 * be removed if there is __scsi_device_get() interface which 3773 * increments reference counts regardless of device state. 3774 */ 3775 mutex_lock(&ap->scsi_host->scan_mutex); 3776 spin_lock_irqsave(ap->lock, flags); 3777 3778 /* clearing dev->sdev is protected by host lock */ 3779 sdev = dev->sdev; 3780 dev->sdev = NULL; 3781 3782 if (sdev) { 3783 /* If user initiated unplug races with us, sdev can go 3784 * away underneath us after the host lock and 3785 * scan_mutex are released. Hold onto it. 3786 */ 3787 if (scsi_device_get(sdev) == 0) { 3788 /* The following ensures the attached sdev is 3789 * offline on return from ata_scsi_offline_dev() 3790 * regardless it wins or loses the race 3791 * against this function. 3792 */ 3793 scsi_device_set_state(sdev, SDEV_OFFLINE); 3794 } else { 3795 WARN_ON(1); 3796 sdev = NULL; 3797 } 3798 } 3799 3800 spin_unlock_irqrestore(ap->lock, flags); 3801 mutex_unlock(&ap->scsi_host->scan_mutex); 3802 3803 if (sdev) { 3804 ata_dev_info(dev, "detaching (SCSI %s)\n", 3805 dev_name(&sdev->sdev_gendev)); 3806 3807 scsi_remove_device(sdev); 3808 scsi_device_put(sdev); 3809 } 3810 } 3811 3812 static void ata_scsi_handle_link_detach(struct ata_link *link) 3813 { 3814 struct ata_port *ap = link->ap; 3815 struct ata_device *dev; 3816 3817 ata_for_each_dev(dev, link, ALL) { 3818 unsigned long flags; 3819 3820 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3821 continue; 3822 3823 spin_lock_irqsave(ap->lock, flags); 3824 dev->flags &= ~ATA_DFLAG_DETACHED; 3825 spin_unlock_irqrestore(ap->lock, flags); 3826 3827 if (zpodd_dev_enabled(dev)) 3828 zpodd_exit(dev); 3829 3830 ata_scsi_remove_dev(dev); 3831 } 3832 } 3833 3834 /** 3835 * ata_scsi_media_change_notify - send media change event 3836 * @dev: Pointer to the disk device with media change event 3837 * 3838 * Tell the block layer to send a media change notification 3839 * event. 3840 * 3841 * LOCKING: 3842 * spin_lock_irqsave(host lock) 3843 */ 3844 void ata_scsi_media_change_notify(struct ata_device *dev) 3845 { 3846 if (dev->sdev) 3847 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3848 GFP_ATOMIC); 3849 } 3850 3851 /** 3852 * ata_scsi_hotplug - SCSI part of hotplug 3853 * @work: Pointer to ATA port to perform SCSI hotplug on 3854 * 3855 * Perform SCSI part of hotplug. It's executed from a separate 3856 * workqueue after EH completes. This is necessary because SCSI 3857 * hot plugging requires working EH and hot unplugging is 3858 * synchronized with hot plugging with a mutex. 3859 * 3860 * LOCKING: 3861 * Kernel thread context (may sleep). 3862 */ 3863 void ata_scsi_hotplug(struct work_struct *work) 3864 { 3865 struct ata_port *ap = 3866 container_of(work, struct ata_port, hotplug_task.work); 3867 int i; 3868 3869 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3870 DPRINTK("ENTER/EXIT - unloading\n"); 3871 return; 3872 } 3873 3874 DPRINTK("ENTER\n"); 3875 mutex_lock(&ap->scsi_scan_mutex); 3876 3877 /* Unplug detached devices. We cannot use link iterator here 3878 * because PMP links have to be scanned even if PMP is 3879 * currently not attached. Iterate manually. 3880 */ 3881 ata_scsi_handle_link_detach(&ap->link); 3882 if (ap->pmp_link) 3883 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3884 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3885 3886 /* scan for new ones */ 3887 ata_scsi_scan_host(ap, 0); 3888 3889 mutex_unlock(&ap->scsi_scan_mutex); 3890 DPRINTK("EXIT\n"); 3891 } 3892 3893 /** 3894 * ata_scsi_user_scan - indication for user-initiated bus scan 3895 * @shost: SCSI host to scan 3896 * @channel: Channel to scan 3897 * @id: ID to scan 3898 * @lun: LUN to scan 3899 * 3900 * This function is called when user explicitly requests bus 3901 * scan. Set probe pending flag and invoke EH. 3902 * 3903 * LOCKING: 3904 * SCSI layer (we don't care) 3905 * 3906 * RETURNS: 3907 * Zero. 3908 */ 3909 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3910 unsigned int id, unsigned int lun) 3911 { 3912 struct ata_port *ap = ata_shost_to_port(shost); 3913 unsigned long flags; 3914 int devno, rc = 0; 3915 3916 if (!ap->ops->error_handler) 3917 return -EOPNOTSUPP; 3918 3919 if (lun != SCAN_WILD_CARD && lun) 3920 return -EINVAL; 3921 3922 if (!sata_pmp_attached(ap)) { 3923 if (channel != SCAN_WILD_CARD && channel) 3924 return -EINVAL; 3925 devno = id; 3926 } else { 3927 if (id != SCAN_WILD_CARD && id) 3928 return -EINVAL; 3929 devno = channel; 3930 } 3931 3932 spin_lock_irqsave(ap->lock, flags); 3933 3934 if (devno == SCAN_WILD_CARD) { 3935 struct ata_link *link; 3936 3937 ata_for_each_link(link, ap, EDGE) { 3938 struct ata_eh_info *ehi = &link->eh_info; 3939 ehi->probe_mask |= ATA_ALL_DEVICES; 3940 ehi->action |= ATA_EH_RESET; 3941 } 3942 } else { 3943 struct ata_device *dev = ata_find_dev(ap, devno); 3944 3945 if (dev) { 3946 struct ata_eh_info *ehi = &dev->link->eh_info; 3947 ehi->probe_mask |= 1 << dev->devno; 3948 ehi->action |= ATA_EH_RESET; 3949 } else 3950 rc = -EINVAL; 3951 } 3952 3953 if (rc == 0) { 3954 ata_port_schedule_eh(ap); 3955 spin_unlock_irqrestore(ap->lock, flags); 3956 ata_port_wait_eh(ap); 3957 } else 3958 spin_unlock_irqrestore(ap->lock, flags); 3959 3960 return rc; 3961 } 3962 3963 /** 3964 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3965 * @work: Pointer to ATA port to perform scsi_rescan_device() 3966 * 3967 * After ATA pass thru (SAT) commands are executed successfully, 3968 * libata need to propagate the changes to SCSI layer. 3969 * 3970 * LOCKING: 3971 * Kernel thread context (may sleep). 3972 */ 3973 void ata_scsi_dev_rescan(struct work_struct *work) 3974 { 3975 struct ata_port *ap = 3976 container_of(work, struct ata_port, scsi_rescan_task); 3977 struct ata_link *link; 3978 struct ata_device *dev; 3979 unsigned long flags; 3980 3981 mutex_lock(&ap->scsi_scan_mutex); 3982 spin_lock_irqsave(ap->lock, flags); 3983 3984 ata_for_each_link(link, ap, EDGE) { 3985 ata_for_each_dev(dev, link, ENABLED) { 3986 struct scsi_device *sdev = dev->sdev; 3987 3988 if (!sdev) 3989 continue; 3990 if (scsi_device_get(sdev)) 3991 continue; 3992 3993 spin_unlock_irqrestore(ap->lock, flags); 3994 scsi_rescan_device(&(sdev->sdev_gendev)); 3995 scsi_device_put(sdev); 3996 spin_lock_irqsave(ap->lock, flags); 3997 } 3998 } 3999 4000 spin_unlock_irqrestore(ap->lock, flags); 4001 mutex_unlock(&ap->scsi_scan_mutex); 4002 } 4003 4004 /** 4005 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 4006 * @host: ATA host container for all SAS ports 4007 * @port_info: Information from low-level host driver 4008 * @shost: SCSI host that the scsi device is attached to 4009 * 4010 * LOCKING: 4011 * PCI/etc. bus probe sem. 4012 * 4013 * RETURNS: 4014 * ata_port pointer on success / NULL on failure. 4015 */ 4016 4017 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4018 struct ata_port_info *port_info, 4019 struct Scsi_Host *shost) 4020 { 4021 struct ata_port *ap; 4022 4023 ap = ata_port_alloc(host); 4024 if (!ap) 4025 return NULL; 4026 4027 ap->port_no = 0; 4028 ap->lock = &host->lock; 4029 ap->pio_mask = port_info->pio_mask; 4030 ap->mwdma_mask = port_info->mwdma_mask; 4031 ap->udma_mask = port_info->udma_mask; 4032 ap->flags |= port_info->flags; 4033 ap->ops = port_info->port_ops; 4034 ap->cbl = ATA_CBL_SATA; 4035 4036 return ap; 4037 } 4038 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4039 4040 /** 4041 * ata_sas_port_start - Set port up for dma. 4042 * @ap: Port to initialize 4043 * 4044 * Called just after data structures for each port are 4045 * initialized. 4046 * 4047 * May be used as the port_start() entry in ata_port_operations. 4048 * 4049 * LOCKING: 4050 * Inherited from caller. 4051 */ 4052 int ata_sas_port_start(struct ata_port *ap) 4053 { 4054 /* 4055 * the port is marked as frozen at allocation time, but if we don't 4056 * have new eh, we won't thaw it 4057 */ 4058 if (!ap->ops->error_handler) 4059 ap->pflags &= ~ATA_PFLAG_FROZEN; 4060 return 0; 4061 } 4062 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4063 4064 /** 4065 * ata_port_stop - Undo ata_sas_port_start() 4066 * @ap: Port to shut down 4067 * 4068 * May be used as the port_stop() entry in ata_port_operations. 4069 * 4070 * LOCKING: 4071 * Inherited from caller. 4072 */ 4073 4074 void ata_sas_port_stop(struct ata_port *ap) 4075 { 4076 } 4077 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4078 4079 /** 4080 * ata_sas_async_probe - simply schedule probing and return 4081 * @ap: Port to probe 4082 * 4083 * For batch scheduling of probe for sas attached ata devices, assumes 4084 * the port has already been through ata_sas_port_init() 4085 */ 4086 void ata_sas_async_probe(struct ata_port *ap) 4087 { 4088 __ata_port_probe(ap); 4089 } 4090 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4091 4092 int ata_sas_sync_probe(struct ata_port *ap) 4093 { 4094 return ata_port_probe(ap); 4095 } 4096 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4097 4098 4099 /** 4100 * ata_sas_port_init - Initialize a SATA device 4101 * @ap: SATA port to initialize 4102 * 4103 * LOCKING: 4104 * PCI/etc. bus probe sem. 4105 * 4106 * RETURNS: 4107 * Zero on success, non-zero on error. 4108 */ 4109 4110 int ata_sas_port_init(struct ata_port *ap) 4111 { 4112 int rc = ap->ops->port_start(ap); 4113 4114 if (rc) 4115 return rc; 4116 ap->print_id = atomic_inc_return(&ata_print_id); 4117 return 0; 4118 } 4119 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4120 4121 /** 4122 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4123 * @ap: SATA port to destroy 4124 * 4125 */ 4126 4127 void ata_sas_port_destroy(struct ata_port *ap) 4128 { 4129 if (ap->ops->port_stop) 4130 ap->ops->port_stop(ap); 4131 kfree(ap); 4132 } 4133 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4134 4135 /** 4136 * ata_sas_slave_configure - Default slave_config routine for libata devices 4137 * @sdev: SCSI device to configure 4138 * @ap: ATA port to which SCSI device is attached 4139 * 4140 * RETURNS: 4141 * Zero. 4142 */ 4143 4144 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4145 { 4146 ata_scsi_sdev_config(sdev); 4147 ata_scsi_dev_config(sdev, ap->link.device); 4148 return 0; 4149 } 4150 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4151 4152 /** 4153 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4154 * @cmd: SCSI command to be sent 4155 * @ap: ATA port to which the command is being sent 4156 * 4157 * RETURNS: 4158 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4159 * 0 otherwise. 4160 */ 4161 4162 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4163 { 4164 int rc = 0; 4165 4166 ata_scsi_dump_cdb(ap, cmd); 4167 4168 if (likely(ata_dev_enabled(ap->link.device))) 4169 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4170 else { 4171 cmd->result = (DID_BAD_TARGET << 16); 4172 cmd->scsi_done(cmd); 4173 } 4174 return rc; 4175 } 4176 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4177