1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Tejun Heo <tj@kernel.org> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/slab.h> 37 #include <linux/kernel.h> 38 #include <linux/blkdev.h> 39 #include <linux/spinlock.h> 40 #include <linux/export.h> 41 #include <scsi/scsi.h> 42 #include <scsi/scsi_host.h> 43 #include <scsi/scsi_cmnd.h> 44 #include <scsi/scsi_eh.h> 45 #include <scsi/scsi_device.h> 46 #include <scsi/scsi_tcq.h> 47 #include <scsi/scsi_transport.h> 48 #include <linux/libata.h> 49 #include <linux/hdreg.h> 50 #include <linux/uaccess.h> 51 #include <linux/suspend.h> 52 #include <linux/pm_qos.h> 53 #include <asm/unaligned.h> 54 55 #include "libata.h" 56 #include "libata-transport.h" 57 58 #define ATA_SCSI_RBUF_SIZE 4096 59 60 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); 61 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; 62 63 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 64 65 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 66 const struct scsi_device *scsidev); 67 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap, 68 const struct scsi_device *scsidev); 69 70 #define RW_RECOVERY_MPAGE 0x1 71 #define RW_RECOVERY_MPAGE_LEN 12 72 #define CACHE_MPAGE 0x8 73 #define CACHE_MPAGE_LEN 20 74 #define CONTROL_MPAGE 0xa 75 #define CONTROL_MPAGE_LEN 12 76 #define ALL_MPAGES 0x3f 77 #define ALL_SUB_MPAGES 0xff 78 79 80 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { 81 RW_RECOVERY_MPAGE, 82 RW_RECOVERY_MPAGE_LEN - 2, 83 (1 << 7), /* AWRE */ 84 0, /* read retry count */ 85 0, 0, 0, 0, 86 0, /* write retry count */ 87 0, 0, 0 88 }; 89 90 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 91 CACHE_MPAGE, 92 CACHE_MPAGE_LEN - 2, 93 0, /* contains WCE, needs to be 0 for logic */ 94 0, 0, 0, 0, 0, 0, 0, 0, 0, 95 0, /* contains DRA, needs to be 0 for logic */ 96 0, 0, 0, 0, 0, 0, 0 97 }; 98 99 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 100 CONTROL_MPAGE, 101 CONTROL_MPAGE_LEN - 2, 102 2, /* DSENSE=0, GLTSD=1 */ 103 0, /* [QAM+QERR may be 1, see 05-359r1] */ 104 0, 0, 0, 0, 0xff, 0xff, 105 0, 30 /* extended self test time, see 05-359r1 */ 106 }; 107 108 static const char *ata_lpm_policy_names[] = { 109 [ATA_LPM_UNKNOWN] = "max_performance", 110 [ATA_LPM_MAX_POWER] = "max_performance", 111 [ATA_LPM_MED_POWER] = "medium_power", 112 [ATA_LPM_MIN_POWER] = "min_power", 113 }; 114 115 static ssize_t ata_scsi_lpm_store(struct device *dev, 116 struct device_attribute *attr, 117 const char *buf, size_t count) 118 { 119 struct Scsi_Host *shost = class_to_shost(dev); 120 struct ata_port *ap = ata_shost_to_port(shost); 121 enum ata_lpm_policy policy; 122 unsigned long flags; 123 124 /* UNKNOWN is internal state, iterate from MAX_POWER */ 125 for (policy = ATA_LPM_MAX_POWER; 126 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 127 const char *name = ata_lpm_policy_names[policy]; 128 129 if (strncmp(name, buf, strlen(name)) == 0) 130 break; 131 } 132 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 133 return -EINVAL; 134 135 spin_lock_irqsave(ap->lock, flags); 136 ap->target_lpm_policy = policy; 137 ata_port_schedule_eh(ap); 138 spin_unlock_irqrestore(ap->lock, flags); 139 140 return count; 141 } 142 143 static ssize_t ata_scsi_lpm_show(struct device *dev, 144 struct device_attribute *attr, char *buf) 145 { 146 struct Scsi_Host *shost = class_to_shost(dev); 147 struct ata_port *ap = ata_shost_to_port(shost); 148 149 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 150 return -EINVAL; 151 152 return snprintf(buf, PAGE_SIZE, "%s\n", 153 ata_lpm_policy_names[ap->target_lpm_policy]); 154 } 155 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 156 ata_scsi_lpm_show, ata_scsi_lpm_store); 157 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 158 159 static ssize_t ata_scsi_park_show(struct device *device, 160 struct device_attribute *attr, char *buf) 161 { 162 struct scsi_device *sdev = to_scsi_device(device); 163 struct ata_port *ap; 164 struct ata_link *link; 165 struct ata_device *dev; 166 unsigned long flags, now; 167 unsigned int uninitialized_var(msecs); 168 int rc = 0; 169 170 ap = ata_shost_to_port(sdev->host); 171 172 spin_lock_irqsave(ap->lock, flags); 173 dev = ata_scsi_find_dev(ap, sdev); 174 if (!dev) { 175 rc = -ENODEV; 176 goto unlock; 177 } 178 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 179 rc = -EOPNOTSUPP; 180 goto unlock; 181 } 182 183 link = dev->link; 184 now = jiffies; 185 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && 186 link->eh_context.unloaded_mask & (1 << dev->devno) && 187 time_after(dev->unpark_deadline, now)) 188 msecs = jiffies_to_msecs(dev->unpark_deadline - now); 189 else 190 msecs = 0; 191 192 unlock: 193 spin_unlock_irq(ap->lock); 194 195 return rc ? rc : snprintf(buf, 20, "%u\n", msecs); 196 } 197 198 static ssize_t ata_scsi_park_store(struct device *device, 199 struct device_attribute *attr, 200 const char *buf, size_t len) 201 { 202 struct scsi_device *sdev = to_scsi_device(device); 203 struct ata_port *ap; 204 struct ata_device *dev; 205 long int input; 206 unsigned long flags; 207 int rc; 208 209 rc = strict_strtol(buf, 10, &input); 210 if (rc || input < -2) 211 return -EINVAL; 212 if (input > ATA_TMOUT_MAX_PARK) { 213 rc = -EOVERFLOW; 214 input = ATA_TMOUT_MAX_PARK; 215 } 216 217 ap = ata_shost_to_port(sdev->host); 218 219 spin_lock_irqsave(ap->lock, flags); 220 dev = ata_scsi_find_dev(ap, sdev); 221 if (unlikely(!dev)) { 222 rc = -ENODEV; 223 goto unlock; 224 } 225 if (dev->class != ATA_DEV_ATA) { 226 rc = -EOPNOTSUPP; 227 goto unlock; 228 } 229 230 if (input >= 0) { 231 if (dev->flags & ATA_DFLAG_NO_UNLOAD) { 232 rc = -EOPNOTSUPP; 233 goto unlock; 234 } 235 236 dev->unpark_deadline = ata_deadline(jiffies, input); 237 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; 238 ata_port_schedule_eh(ap); 239 complete(&ap->park_req_pending); 240 } else { 241 switch (input) { 242 case -1: 243 dev->flags &= ~ATA_DFLAG_NO_UNLOAD; 244 break; 245 case -2: 246 dev->flags |= ATA_DFLAG_NO_UNLOAD; 247 break; 248 } 249 } 250 unlock: 251 spin_unlock_irqrestore(ap->lock, flags); 252 253 return rc ? rc : len; 254 } 255 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, 256 ata_scsi_park_show, ata_scsi_park_store); 257 EXPORT_SYMBOL_GPL(dev_attr_unload_heads); 258 259 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 260 { 261 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 262 263 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq); 264 } 265 266 static ssize_t 267 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 268 const char *buf, size_t count) 269 { 270 struct Scsi_Host *shost = class_to_shost(dev); 271 struct ata_port *ap = ata_shost_to_port(shost); 272 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 273 return ap->ops->em_store(ap, buf, count); 274 return -EINVAL; 275 } 276 277 static ssize_t 278 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 279 char *buf) 280 { 281 struct Scsi_Host *shost = class_to_shost(dev); 282 struct ata_port *ap = ata_shost_to_port(shost); 283 284 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 285 return ap->ops->em_show(ap, buf); 286 return -EINVAL; 287 } 288 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 289 ata_scsi_em_message_show, ata_scsi_em_message_store); 290 EXPORT_SYMBOL_GPL(dev_attr_em_message); 291 292 static ssize_t 293 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 294 char *buf) 295 { 296 struct Scsi_Host *shost = class_to_shost(dev); 297 struct ata_port *ap = ata_shost_to_port(shost); 298 299 return snprintf(buf, 23, "%d\n", ap->em_message_type); 300 } 301 DEVICE_ATTR(em_message_type, S_IRUGO, 302 ata_scsi_em_message_type_show, NULL); 303 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 304 305 static ssize_t 306 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 307 char *buf) 308 { 309 struct scsi_device *sdev = to_scsi_device(dev); 310 struct ata_port *ap = ata_shost_to_port(sdev->host); 311 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 312 313 if (atadev && ap->ops->sw_activity_show && 314 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 315 return ap->ops->sw_activity_show(atadev, buf); 316 return -EINVAL; 317 } 318 319 static ssize_t 320 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 321 const char *buf, size_t count) 322 { 323 struct scsi_device *sdev = to_scsi_device(dev); 324 struct ata_port *ap = ata_shost_to_port(sdev->host); 325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 326 enum sw_activity val; 327 int rc; 328 329 if (atadev && ap->ops->sw_activity_store && 330 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 331 val = simple_strtoul(buf, NULL, 0); 332 switch (val) { 333 case OFF: case BLINK_ON: case BLINK_OFF: 334 rc = ap->ops->sw_activity_store(atadev, val); 335 if (!rc) 336 return count; 337 else 338 return rc; 339 } 340 } 341 return -EINVAL; 342 } 343 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 344 ata_scsi_activity_store); 345 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 346 347 struct device_attribute *ata_common_sdev_attrs[] = { 348 &dev_attr_unload_heads, 349 NULL 350 }; 351 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs); 352 353 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd) 354 { 355 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 356 /* "Invalid field in cbd" */ 357 cmd->scsi_done(cmd); 358 } 359 360 /** 361 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 362 * @sdev: SCSI device for which BIOS geometry is to be determined 363 * @bdev: block device associated with @sdev 364 * @capacity: capacity of SCSI device 365 * @geom: location to which geometry will be output 366 * 367 * Generic bios head/sector/cylinder calculator 368 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 369 * mapping. Some situations may arise where the disk is not 370 * bootable if this is not used. 371 * 372 * LOCKING: 373 * Defined by the SCSI layer. We don't really care. 374 * 375 * RETURNS: 376 * Zero. 377 */ 378 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 379 sector_t capacity, int geom[]) 380 { 381 geom[0] = 255; 382 geom[1] = 63; 383 sector_div(capacity, 255*63); 384 geom[2] = capacity; 385 386 return 0; 387 } 388 389 /** 390 * ata_scsi_unlock_native_capacity - unlock native capacity 391 * @sdev: SCSI device to adjust device capacity for 392 * 393 * This function is called if a partition on @sdev extends beyond 394 * the end of the device. It requests EH to unlock HPA. 395 * 396 * LOCKING: 397 * Defined by the SCSI layer. Might sleep. 398 */ 399 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) 400 { 401 struct ata_port *ap = ata_shost_to_port(sdev->host); 402 struct ata_device *dev; 403 unsigned long flags; 404 405 spin_lock_irqsave(ap->lock, flags); 406 407 dev = ata_scsi_find_dev(ap, sdev); 408 if (dev && dev->n_sectors < dev->n_native_sectors) { 409 dev->flags |= ATA_DFLAG_UNLOCK_HPA; 410 dev->link->eh_info.action |= ATA_EH_RESET; 411 ata_port_schedule_eh(ap); 412 } 413 414 spin_unlock_irqrestore(ap->lock, flags); 415 ata_port_wait_eh(ap); 416 } 417 418 /** 419 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 420 * @ap: target port 421 * @sdev: SCSI device to get identify data for 422 * @arg: User buffer area for identify data 423 * 424 * LOCKING: 425 * Defined by the SCSI layer. We don't really care. 426 * 427 * RETURNS: 428 * Zero on success, negative errno on error. 429 */ 430 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, 431 void __user *arg) 432 { 433 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 434 u16 __user *dst = arg; 435 char buf[40]; 436 437 if (!dev) 438 return -ENOMSG; 439 440 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 441 return -EFAULT; 442 443 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 444 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 445 return -EFAULT; 446 447 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 448 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 449 return -EFAULT; 450 451 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 452 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 453 return -EFAULT; 454 455 return 0; 456 } 457 458 /** 459 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 460 * @scsidev: Device to which we are issuing command 461 * @arg: User provided data for issuing command 462 * 463 * LOCKING: 464 * Defined by the SCSI layer. We don't really care. 465 * 466 * RETURNS: 467 * Zero on success, negative errno on error. 468 */ 469 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 470 { 471 int rc = 0; 472 u8 scsi_cmd[MAX_COMMAND_SIZE]; 473 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 474 int argsize = 0; 475 enum dma_data_direction data_dir; 476 int cmd_result; 477 478 if (arg == NULL) 479 return -EINVAL; 480 481 if (copy_from_user(args, arg, sizeof(args))) 482 return -EFAULT; 483 484 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 485 if (!sensebuf) 486 return -ENOMEM; 487 488 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 489 490 if (args[3]) { 491 argsize = ATA_SECT_SIZE * args[3]; 492 argbuf = kmalloc(argsize, GFP_KERNEL); 493 if (argbuf == NULL) { 494 rc = -ENOMEM; 495 goto error; 496 } 497 498 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 499 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 500 block count in sector count field */ 501 data_dir = DMA_FROM_DEVICE; 502 } else { 503 scsi_cmd[1] = (3 << 1); /* Non-data */ 504 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 505 data_dir = DMA_NONE; 506 } 507 508 scsi_cmd[0] = ATA_16; 509 510 scsi_cmd[4] = args[2]; 511 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ 512 scsi_cmd[6] = args[3]; 513 scsi_cmd[8] = args[1]; 514 scsi_cmd[10] = 0x4f; 515 scsi_cmd[12] = 0xc2; 516 } else { 517 scsi_cmd[6] = args[1]; 518 } 519 scsi_cmd[14] = args[0]; 520 521 /* Good values for timeout and retries? Values below 522 from scsi_ioctl_send_command() for default case... */ 523 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 524 sensebuf, (10*HZ), 5, 0, NULL); 525 526 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 527 u8 *desc = sensebuf + 8; 528 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 529 530 /* If we set cc then ATA pass-through will cause a 531 * check condition even if no error. Filter that. */ 532 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 533 struct scsi_sense_hdr sshdr; 534 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 535 &sshdr); 536 if (sshdr.sense_key == RECOVERED_ERROR && 537 sshdr.asc == 0 && sshdr.ascq == 0x1d) 538 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 539 } 540 541 /* Send userspace a few ATA registers (same as drivers/ide) */ 542 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 543 desc[0] == 0x09) { /* code is "ATA Descriptor" */ 544 args[0] = desc[13]; /* status */ 545 args[1] = desc[3]; /* error */ 546 args[2] = desc[5]; /* sector count (0:7) */ 547 if (copy_to_user(arg, args, sizeof(args))) 548 rc = -EFAULT; 549 } 550 } 551 552 553 if (cmd_result) { 554 rc = -EIO; 555 goto error; 556 } 557 558 if ((argbuf) 559 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 560 rc = -EFAULT; 561 error: 562 kfree(sensebuf); 563 kfree(argbuf); 564 return rc; 565 } 566 567 /** 568 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 569 * @scsidev: Device to which we are issuing command 570 * @arg: User provided data for issuing command 571 * 572 * LOCKING: 573 * Defined by the SCSI layer. We don't really care. 574 * 575 * RETURNS: 576 * Zero on success, negative errno on error. 577 */ 578 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 579 { 580 int rc = 0; 581 u8 scsi_cmd[MAX_COMMAND_SIZE]; 582 u8 args[7], *sensebuf = NULL; 583 int cmd_result; 584 585 if (arg == NULL) 586 return -EINVAL; 587 588 if (copy_from_user(args, arg, sizeof(args))) 589 return -EFAULT; 590 591 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 592 if (!sensebuf) 593 return -ENOMEM; 594 595 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 596 scsi_cmd[0] = ATA_16; 597 scsi_cmd[1] = (3 << 1); /* Non-data */ 598 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 599 scsi_cmd[4] = args[1]; 600 scsi_cmd[6] = args[2]; 601 scsi_cmd[8] = args[3]; 602 scsi_cmd[10] = args[4]; 603 scsi_cmd[12] = args[5]; 604 scsi_cmd[13] = args[6] & 0x4f; 605 scsi_cmd[14] = args[0]; 606 607 /* Good values for timeout and retries? Values below 608 from scsi_ioctl_send_command() for default case... */ 609 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 610 sensebuf, (10*HZ), 5, 0, NULL); 611 612 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 613 u8 *desc = sensebuf + 8; 614 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 615 616 /* If we set cc then ATA pass-through will cause a 617 * check condition even if no error. Filter that. */ 618 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 619 struct scsi_sense_hdr sshdr; 620 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 621 &sshdr); 622 if (sshdr.sense_key == RECOVERED_ERROR && 623 sshdr.asc == 0 && sshdr.ascq == 0x1d) 624 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 625 } 626 627 /* Send userspace ATA registers */ 628 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 629 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 630 args[0] = desc[13]; /* status */ 631 args[1] = desc[3]; /* error */ 632 args[2] = desc[5]; /* sector count (0:7) */ 633 args[3] = desc[7]; /* lbal */ 634 args[4] = desc[9]; /* lbam */ 635 args[5] = desc[11]; /* lbah */ 636 args[6] = desc[12]; /* select */ 637 if (copy_to_user(arg, args, sizeof(args))) 638 rc = -EFAULT; 639 } 640 } 641 642 if (cmd_result) { 643 rc = -EIO; 644 goto error; 645 } 646 647 error: 648 kfree(sensebuf); 649 return rc; 650 } 651 652 static int ata_ioc32(struct ata_port *ap) 653 { 654 if (ap->flags & ATA_FLAG_PIO_DMA) 655 return 1; 656 if (ap->pflags & ATA_PFLAG_PIO32) 657 return 1; 658 return 0; 659 } 660 661 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, 662 int cmd, void __user *arg) 663 { 664 int val = -EINVAL, rc = -EINVAL; 665 unsigned long flags; 666 667 switch (cmd) { 668 case ATA_IOC_GET_IO32: 669 spin_lock_irqsave(ap->lock, flags); 670 val = ata_ioc32(ap); 671 spin_unlock_irqrestore(ap->lock, flags); 672 if (copy_to_user(arg, &val, 1)) 673 return -EFAULT; 674 return 0; 675 676 case ATA_IOC_SET_IO32: 677 val = (unsigned long) arg; 678 rc = 0; 679 spin_lock_irqsave(ap->lock, flags); 680 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { 681 if (val) 682 ap->pflags |= ATA_PFLAG_PIO32; 683 else 684 ap->pflags &= ~ATA_PFLAG_PIO32; 685 } else { 686 if (val != ata_ioc32(ap)) 687 rc = -EINVAL; 688 } 689 spin_unlock_irqrestore(ap->lock, flags); 690 return rc; 691 692 case HDIO_GET_IDENTITY: 693 return ata_get_identity(ap, scsidev, arg); 694 695 case HDIO_DRIVE_CMD: 696 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 697 return -EACCES; 698 return ata_cmd_ioctl(scsidev, arg); 699 700 case HDIO_DRIVE_TASK: 701 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 702 return -EACCES; 703 return ata_task_ioctl(scsidev, arg); 704 705 default: 706 rc = -ENOTTY; 707 break; 708 } 709 710 return rc; 711 } 712 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); 713 714 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 715 { 716 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), 717 scsidev, cmd, arg); 718 } 719 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 720 721 /** 722 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 723 * @dev: ATA device to which the new command is attached 724 * @cmd: SCSI command that originated this ATA command 725 * 726 * Obtain a reference to an unused ata_queued_cmd structure, 727 * which is the basic libata structure representing a single 728 * ATA command sent to the hardware. 729 * 730 * If a command was available, fill in the SCSI-specific 731 * portions of the structure with information on the 732 * current command. 733 * 734 * LOCKING: 735 * spin_lock_irqsave(host lock) 736 * 737 * RETURNS: 738 * Command allocated, or %NULL if none available. 739 */ 740 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 741 struct scsi_cmnd *cmd) 742 { 743 struct ata_queued_cmd *qc; 744 745 qc = ata_qc_new_init(dev); 746 if (qc) { 747 qc->scsicmd = cmd; 748 qc->scsidone = cmd->scsi_done; 749 750 qc->sg = scsi_sglist(cmd); 751 qc->n_elem = scsi_sg_count(cmd); 752 } else { 753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 754 cmd->scsi_done(cmd); 755 } 756 757 return qc; 758 } 759 760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) 761 { 762 struct scsi_cmnd *scmd = qc->scsicmd; 763 764 qc->extrabytes = scmd->request->extra_len; 765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; 766 } 767 768 /** 769 * ata_dump_status - user friendly display of error info 770 * @id: id of the port in question 771 * @tf: ptr to filled out taskfile 772 * 773 * Decode and dump the ATA error/status registers for the user so 774 * that they have some idea what really happened at the non 775 * make-believe layer. 776 * 777 * LOCKING: 778 * inherited from caller 779 */ 780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 781 { 782 u8 stat = tf->command, err = tf->feature; 783 784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 785 if (stat & ATA_BUSY) { 786 printk("Busy }\n"); /* Data is not valid in this case */ 787 } else { 788 if (stat & 0x40) printk("DriveReady "); 789 if (stat & 0x20) printk("DeviceFault "); 790 if (stat & 0x10) printk("SeekComplete "); 791 if (stat & 0x08) printk("DataRequest "); 792 if (stat & 0x04) printk("CorrectedError "); 793 if (stat & 0x02) printk("Index "); 794 if (stat & 0x01) printk("Error "); 795 printk("}\n"); 796 797 if (err) { 798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 799 if (err & 0x04) printk("DriveStatusError "); 800 if (err & 0x80) { 801 if (err & 0x04) printk("BadCRC "); 802 else printk("Sector "); 803 } 804 if (err & 0x40) printk("UncorrectableError "); 805 if (err & 0x10) printk("SectorIdNotFound "); 806 if (err & 0x02) printk("TrackZeroNotFound "); 807 if (err & 0x01) printk("AddrMarkNotFound "); 808 printk("}\n"); 809 } 810 } 811 } 812 813 /** 814 * ata_to_sense_error - convert ATA error to SCSI error 815 * @id: ATA device number 816 * @drv_stat: value contained in ATA status register 817 * @drv_err: value contained in ATA error register 818 * @sk: the sense key we'll fill out 819 * @asc: the additional sense code we'll fill out 820 * @ascq: the additional sense code qualifier we'll fill out 821 * @verbose: be verbose 822 * 823 * Converts an ATA error into a SCSI error. Fill out pointers to 824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 825 * format sense blocks. 826 * 827 * LOCKING: 828 * spin_lock_irqsave(host lock) 829 */ 830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 831 u8 *asc, u8 *ascq, int verbose) 832 { 833 int i; 834 835 /* Based on the 3ware driver translation table */ 836 static const unsigned char sense_table[][4] = { 837 /* BBD|ECC|ID|MAR */ 838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 839 /* BBD|ECC|ID */ 840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 841 /* ECC|MC|MARK */ 842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 845 /* MC|ID|ABRT|TRK0|MARK */ 846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 847 /* MCR|MARK */ 848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 849 /* Bad address mark */ 850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 851 /* TRK0 */ 852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 853 /* Abort & !ICRC */ 854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 855 /* Media change request */ 856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 857 /* SRV */ 858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 859 /* Media change */ 860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 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, 0x00, 0x00}, // Device fault 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 /* No immediate match */ 896 if (verbose) 897 printk(KERN_WARNING "ata%u: no sense translation for " 898 "error 0x%02x\n", id, drv_err); 899 } 900 901 /* Fall back to interpreting status bits */ 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 /* No error? Undecoded? */ 911 if (verbose) 912 printk(KERN_WARNING "ata%u: no sense translation for " 913 "status: 0x%02x\n", id, drv_stat); 914 915 /* We need a sensible error return here, which is tricky, and one 916 that won't cause people to do things like return a disk wrongly */ 917 *sk = ABORTED_COMMAND; 918 *asc = 0x00; 919 *ascq = 0x00; 920 921 translate_done: 922 if (verbose) 923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 925 id, drv_stat, drv_err, *sk, *asc, *ascq); 926 return; 927 } 928 929 /* 930 * ata_gen_passthru_sense - Generate check condition sense block. 931 * @qc: Command that completed. 932 * 933 * This function is specific to the ATA descriptor format sense 934 * block specified for the ATA pass through commands. Regardless 935 * of whether the command errored or not, return a sense 936 * block. Copy all controller registers into the sense 937 * block. If there was no error, we get the request from an ATA 938 * passthrough command, so we use the following sense data: 939 * sk = RECOVERED ERROR 940 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 941 * 942 * 943 * LOCKING: 944 * None. 945 */ 946 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 947 { 948 struct scsi_cmnd *cmd = qc->scsicmd; 949 struct ata_taskfile *tf = &qc->result_tf; 950 unsigned char *sb = cmd->sense_buffer; 951 unsigned char *desc = sb + 8; 952 int verbose = qc->ap->ops->error_handler == NULL; 953 954 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 955 956 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 957 958 /* 959 * Use ata_to_sense_error() to map status register bits 960 * onto sense key, asc & ascq. 961 */ 962 if (qc->err_mask || 963 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 964 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 965 &sb[1], &sb[2], &sb[3], verbose); 966 sb[1] &= 0x0f; 967 } else { 968 sb[1] = RECOVERED_ERROR; 969 sb[2] = 0; 970 sb[3] = 0x1D; 971 } 972 973 /* 974 * Sense data is current and format is descriptor. 975 */ 976 sb[0] = 0x72; 977 978 desc[0] = 0x09; 979 980 /* set length of additional sense data */ 981 sb[7] = 14; 982 desc[1] = 12; 983 984 /* 985 * Copy registers into sense buffer. 986 */ 987 desc[2] = 0x00; 988 desc[3] = tf->feature; /* == error reg */ 989 desc[5] = tf->nsect; 990 desc[7] = tf->lbal; 991 desc[9] = tf->lbam; 992 desc[11] = tf->lbah; 993 desc[12] = tf->device; 994 desc[13] = tf->command; /* == status reg */ 995 996 /* 997 * Fill in Extend bit, and the high order bytes 998 * if applicable. 999 */ 1000 if (tf->flags & ATA_TFLAG_LBA48) { 1001 desc[2] |= 0x01; 1002 desc[4] = tf->hob_nsect; 1003 desc[6] = tf->hob_lbal; 1004 desc[8] = tf->hob_lbam; 1005 desc[10] = tf->hob_lbah; 1006 } 1007 } 1008 1009 /** 1010 * ata_gen_ata_sense - generate a SCSI fixed sense block 1011 * @qc: Command that we are erroring out 1012 * 1013 * Generate sense block for a failed ATA command @qc. Descriptor 1014 * format is used to accommodate LBA48 block address. 1015 * 1016 * LOCKING: 1017 * None. 1018 */ 1019 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 1020 { 1021 struct ata_device *dev = qc->dev; 1022 struct scsi_cmnd *cmd = qc->scsicmd; 1023 struct ata_taskfile *tf = &qc->result_tf; 1024 unsigned char *sb = cmd->sense_buffer; 1025 unsigned char *desc = sb + 8; 1026 int verbose = qc->ap->ops->error_handler == NULL; 1027 u64 block; 1028 1029 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 1030 1031 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 1032 1033 /* sense data is current and format is descriptor */ 1034 sb[0] = 0x72; 1035 1036 /* Use ata_to_sense_error() to map status register bits 1037 * onto sense key, asc & ascq. 1038 */ 1039 if (qc->err_mask || 1040 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 1041 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 1042 &sb[1], &sb[2], &sb[3], verbose); 1043 sb[1] &= 0x0f; 1044 } 1045 1046 block = ata_tf_read_block(&qc->result_tf, dev); 1047 1048 /* information sense data descriptor */ 1049 sb[7] = 12; 1050 desc[0] = 0x00; 1051 desc[1] = 10; 1052 1053 desc[2] |= 0x80; /* valid */ 1054 desc[6] = block >> 40; 1055 desc[7] = block >> 32; 1056 desc[8] = block >> 24; 1057 desc[9] = block >> 16; 1058 desc[10] = block >> 8; 1059 desc[11] = block; 1060 } 1061 1062 static void ata_scsi_sdev_config(struct scsi_device *sdev) 1063 { 1064 sdev->use_10_for_rw = 1; 1065 sdev->use_10_for_ms = 1; 1066 sdev->no_report_opcodes = 1; 1067 sdev->no_write_same = 1; 1068 1069 /* Schedule policy is determined by ->qc_defer() callback and 1070 * it needs to see every deferred qc. Set dev_blocked to 1 to 1071 * prevent SCSI midlayer from automatically deferring 1072 * requests. 1073 */ 1074 sdev->max_device_blocked = 1; 1075 } 1076 1077 /** 1078 * atapi_drain_needed - Check whether data transfer may overflow 1079 * @rq: request to be checked 1080 * 1081 * ATAPI commands which transfer variable length data to host 1082 * might overflow due to application error or hardare bug. This 1083 * function checks whether overflow should be drained and ignored 1084 * for @request. 1085 * 1086 * LOCKING: 1087 * None. 1088 * 1089 * RETURNS: 1090 * 1 if ; otherwise, 0. 1091 */ 1092 static int atapi_drain_needed(struct request *rq) 1093 { 1094 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC)) 1095 return 0; 1096 1097 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE)) 1098 return 0; 1099 1100 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC; 1101 } 1102 1103 static int ata_scsi_dev_config(struct scsi_device *sdev, 1104 struct ata_device *dev) 1105 { 1106 struct request_queue *q = sdev->request_queue; 1107 1108 if (!ata_id_has_unload(dev->id)) 1109 dev->flags |= ATA_DFLAG_NO_UNLOAD; 1110 1111 /* configure max sectors */ 1112 blk_queue_max_hw_sectors(q, dev->max_sectors); 1113 1114 if (dev->class == ATA_DEV_ATAPI) { 1115 void *buf; 1116 1117 sdev->sector_size = ATA_SECT_SIZE; 1118 1119 /* set DMA padding */ 1120 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); 1121 1122 /* configure draining */ 1123 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL); 1124 if (!buf) { 1125 ata_dev_err(dev, "drain buffer allocation failed\n"); 1126 return -ENOMEM; 1127 } 1128 1129 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); 1130 } else { 1131 sdev->sector_size = ata_id_logical_sector_size(dev->id); 1132 sdev->manage_start_stop = 1; 1133 } 1134 1135 /* 1136 * ata_pio_sectors() expects buffer for each sector to not cross 1137 * page boundary. Enforce it by requiring buffers to be sector 1138 * aligned, which works iff sector_size is not larger than 1139 * PAGE_SIZE. ATAPI devices also need the alignment as 1140 * IDENTIFY_PACKET is executed as ATA_PROT_PIO. 1141 */ 1142 if (sdev->sector_size > PAGE_SIZE) 1143 ata_dev_warn(dev, 1144 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", 1145 sdev->sector_size); 1146 1147 blk_queue_update_dma_alignment(q, sdev->sector_size - 1); 1148 1149 if (dev->flags & ATA_DFLAG_AN) 1150 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); 1151 1152 if (dev->flags & ATA_DFLAG_NCQ) { 1153 int depth; 1154 1155 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 1156 depth = min(ATA_MAX_QUEUE - 1, depth); 1157 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 1158 } 1159 1160 blk_queue_flush_queueable(q, false); 1161 1162 dev->sdev = sdev; 1163 return 0; 1164 } 1165 1166 /** 1167 * ata_scsi_slave_config - Set SCSI device attributes 1168 * @sdev: SCSI device to examine 1169 * 1170 * This is called before we actually start reading 1171 * and writing to the device, to configure certain 1172 * SCSI mid-layer behaviors. 1173 * 1174 * LOCKING: 1175 * Defined by SCSI layer. We don't really care. 1176 */ 1177 1178 int ata_scsi_slave_config(struct scsi_device *sdev) 1179 { 1180 struct ata_port *ap = ata_shost_to_port(sdev->host); 1181 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 1182 int rc = 0; 1183 1184 ata_scsi_sdev_config(sdev); 1185 1186 if (dev) 1187 rc = ata_scsi_dev_config(sdev, dev); 1188 1189 return rc; 1190 } 1191 1192 /** 1193 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 1194 * @sdev: SCSI device to be destroyed 1195 * 1196 * @sdev is about to be destroyed for hot/warm unplugging. If 1197 * this unplugging was initiated by libata as indicated by NULL 1198 * dev->sdev, this function doesn't have to do anything. 1199 * Otherwise, SCSI layer initiated warm-unplug is in progress. 1200 * Clear dev->sdev, schedule the device for ATA detach and invoke 1201 * EH. 1202 * 1203 * LOCKING: 1204 * Defined by SCSI layer. We don't really care. 1205 */ 1206 void ata_scsi_slave_destroy(struct scsi_device *sdev) 1207 { 1208 struct ata_port *ap = ata_shost_to_port(sdev->host); 1209 struct request_queue *q = sdev->request_queue; 1210 unsigned long flags; 1211 struct ata_device *dev; 1212 1213 if (!ap->ops->error_handler) 1214 return; 1215 1216 spin_lock_irqsave(ap->lock, flags); 1217 dev = __ata_scsi_find_dev(ap, sdev); 1218 if (dev && dev->sdev) { 1219 /* SCSI device already in CANCEL state, no need to offline it */ 1220 dev->sdev = NULL; 1221 dev->flags |= ATA_DFLAG_DETACH; 1222 ata_port_schedule_eh(ap); 1223 } 1224 spin_unlock_irqrestore(ap->lock, flags); 1225 1226 kfree(q->dma_drain_buffer); 1227 q->dma_drain_buffer = NULL; 1228 q->dma_drain_size = 0; 1229 } 1230 1231 /** 1232 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth 1233 * @ap: ATA port to which the device change the queue depth 1234 * @sdev: SCSI device to configure queue depth for 1235 * @queue_depth: new queue depth 1236 * @reason: calling context 1237 * 1238 * libsas and libata have different approaches for associating a sdev to 1239 * its ata_port. 1240 * 1241 */ 1242 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev, 1243 int queue_depth, int reason) 1244 { 1245 struct ata_device *dev; 1246 unsigned long flags; 1247 1248 if (reason != SCSI_QDEPTH_DEFAULT) 1249 return -EOPNOTSUPP; 1250 1251 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1252 return sdev->queue_depth; 1253 1254 dev = ata_scsi_find_dev(ap, sdev); 1255 if (!dev || !ata_dev_enabled(dev)) 1256 return sdev->queue_depth; 1257 1258 /* NCQ enabled? */ 1259 spin_lock_irqsave(ap->lock, flags); 1260 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1261 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1262 dev->flags |= ATA_DFLAG_NCQ_OFF; 1263 queue_depth = 1; 1264 } 1265 spin_unlock_irqrestore(ap->lock, flags); 1266 1267 /* limit and apply queue depth */ 1268 queue_depth = min(queue_depth, sdev->host->can_queue); 1269 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1270 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1271 1272 if (sdev->queue_depth == queue_depth) 1273 return -EINVAL; 1274 1275 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1276 return queue_depth; 1277 } 1278 1279 /** 1280 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1281 * @sdev: SCSI device to configure queue depth for 1282 * @queue_depth: new queue depth 1283 * @reason: calling context 1284 * 1285 * This is libata standard hostt->change_queue_depth callback. 1286 * SCSI will call into this callback when user tries to set queue 1287 * depth via sysfs. 1288 * 1289 * LOCKING: 1290 * SCSI layer (we don't care) 1291 * 1292 * RETURNS: 1293 * Newly configured queue depth. 1294 */ 1295 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth, 1296 int reason) 1297 { 1298 struct ata_port *ap = ata_shost_to_port(sdev->host); 1299 1300 return __ata_change_queue_depth(ap, sdev, queue_depth, reason); 1301 } 1302 1303 /** 1304 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1305 * @qc: Storage for translated ATA taskfile 1306 * 1307 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1308 * (to start). Perhaps these commands should be preceded by 1309 * CHECK POWER MODE to see what power mode the device is already in. 1310 * [See SAT revision 5 at www.t10.org] 1311 * 1312 * LOCKING: 1313 * spin_lock_irqsave(host lock) 1314 * 1315 * RETURNS: 1316 * Zero on success, non-zero on error. 1317 */ 1318 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1319 { 1320 struct scsi_cmnd *scmd = qc->scsicmd; 1321 struct ata_taskfile *tf = &qc->tf; 1322 const u8 *cdb = scmd->cmnd; 1323 1324 if (scmd->cmd_len < 5) 1325 goto invalid_fld; 1326 1327 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1328 tf->protocol = ATA_PROT_NODATA; 1329 if (cdb[1] & 0x1) { 1330 ; /* ignore IMMED bit, violates sat-r05 */ 1331 } 1332 if (cdb[4] & 0x2) 1333 goto invalid_fld; /* LOEJ bit set not supported */ 1334 if (((cdb[4] >> 4) & 0xf) != 0) 1335 goto invalid_fld; /* power conditions not supported */ 1336 1337 if (cdb[4] & 0x1) { 1338 tf->nsect = 1; /* 1 sector, lba=0 */ 1339 1340 if (qc->dev->flags & ATA_DFLAG_LBA) { 1341 tf->flags |= ATA_TFLAG_LBA; 1342 1343 tf->lbah = 0x0; 1344 tf->lbam = 0x0; 1345 tf->lbal = 0x0; 1346 tf->device |= ATA_LBA; 1347 } else { 1348 /* CHS */ 1349 tf->lbal = 0x1; /* sect */ 1350 tf->lbam = 0x0; /* cyl low */ 1351 tf->lbah = 0x0; /* cyl high */ 1352 } 1353 1354 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1355 } else { 1356 /* Some odd clown BIOSen issue spindown on power off (ACPI S4 1357 * or S5) causing some drives to spin up and down again. 1358 */ 1359 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) && 1360 system_state == SYSTEM_POWER_OFF) 1361 goto skip; 1362 1363 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) && 1364 system_entering_hibernation()) 1365 goto skip; 1366 1367 /* Issue ATA STANDBY IMMEDIATE command */ 1368 tf->command = ATA_CMD_STANDBYNOW1; 1369 } 1370 1371 /* 1372 * Standby and Idle condition timers could be implemented but that 1373 * would require libata to implement the Power condition mode page 1374 * and allow the user to change it. Changing mode pages requires 1375 * MODE SELECT to be implemented. 1376 */ 1377 1378 return 0; 1379 1380 invalid_fld: 1381 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1382 /* "Invalid field in cbd" */ 1383 return 1; 1384 skip: 1385 scmd->result = SAM_STAT_GOOD; 1386 return 1; 1387 } 1388 1389 1390 /** 1391 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1392 * @qc: Storage for translated ATA taskfile 1393 * 1394 * Sets up an ATA taskfile to issue FLUSH CACHE or 1395 * FLUSH CACHE EXT. 1396 * 1397 * LOCKING: 1398 * spin_lock_irqsave(host lock) 1399 * 1400 * RETURNS: 1401 * Zero on success, non-zero on error. 1402 */ 1403 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1404 { 1405 struct ata_taskfile *tf = &qc->tf; 1406 1407 tf->flags |= ATA_TFLAG_DEVICE; 1408 tf->protocol = ATA_PROT_NODATA; 1409 1410 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1411 tf->command = ATA_CMD_FLUSH_EXT; 1412 else 1413 tf->command = ATA_CMD_FLUSH; 1414 1415 /* flush is critical for IO integrity, consider it an IO command */ 1416 qc->flags |= ATA_QCFLAG_IO; 1417 1418 return 0; 1419 } 1420 1421 /** 1422 * scsi_6_lba_len - Get LBA and transfer length 1423 * @cdb: SCSI command to translate 1424 * 1425 * Calculate LBA and transfer length for 6-byte commands. 1426 * 1427 * RETURNS: 1428 * @plba: the LBA 1429 * @plen: the transfer length 1430 */ 1431 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1432 { 1433 u64 lba = 0; 1434 u32 len; 1435 1436 VPRINTK("six-byte command\n"); 1437 1438 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1439 lba |= ((u64)cdb[2]) << 8; 1440 lba |= ((u64)cdb[3]); 1441 1442 len = cdb[4]; 1443 1444 *plba = lba; 1445 *plen = len; 1446 } 1447 1448 /** 1449 * scsi_10_lba_len - Get LBA and transfer length 1450 * @cdb: SCSI command to translate 1451 * 1452 * Calculate LBA and transfer length for 10-byte commands. 1453 * 1454 * RETURNS: 1455 * @plba: the LBA 1456 * @plen: the transfer length 1457 */ 1458 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1459 { 1460 u64 lba = 0; 1461 u32 len = 0; 1462 1463 VPRINTK("ten-byte command\n"); 1464 1465 lba |= ((u64)cdb[2]) << 24; 1466 lba |= ((u64)cdb[3]) << 16; 1467 lba |= ((u64)cdb[4]) << 8; 1468 lba |= ((u64)cdb[5]); 1469 1470 len |= ((u32)cdb[7]) << 8; 1471 len |= ((u32)cdb[8]); 1472 1473 *plba = lba; 1474 *plen = len; 1475 } 1476 1477 /** 1478 * scsi_16_lba_len - Get LBA and transfer length 1479 * @cdb: SCSI command to translate 1480 * 1481 * Calculate LBA and transfer length for 16-byte commands. 1482 * 1483 * RETURNS: 1484 * @plba: the LBA 1485 * @plen: the transfer length 1486 */ 1487 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1488 { 1489 u64 lba = 0; 1490 u32 len = 0; 1491 1492 VPRINTK("sixteen-byte command\n"); 1493 1494 lba |= ((u64)cdb[2]) << 56; 1495 lba |= ((u64)cdb[3]) << 48; 1496 lba |= ((u64)cdb[4]) << 40; 1497 lba |= ((u64)cdb[5]) << 32; 1498 lba |= ((u64)cdb[6]) << 24; 1499 lba |= ((u64)cdb[7]) << 16; 1500 lba |= ((u64)cdb[8]) << 8; 1501 lba |= ((u64)cdb[9]); 1502 1503 len |= ((u32)cdb[10]) << 24; 1504 len |= ((u32)cdb[11]) << 16; 1505 len |= ((u32)cdb[12]) << 8; 1506 len |= ((u32)cdb[13]); 1507 1508 *plba = lba; 1509 *plen = len; 1510 } 1511 1512 /** 1513 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1514 * @qc: Storage for translated ATA taskfile 1515 * 1516 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1517 * 1518 * LOCKING: 1519 * spin_lock_irqsave(host lock) 1520 * 1521 * RETURNS: 1522 * Zero on success, non-zero on error. 1523 */ 1524 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1525 { 1526 struct scsi_cmnd *scmd = qc->scsicmd; 1527 struct ata_taskfile *tf = &qc->tf; 1528 struct ata_device *dev = qc->dev; 1529 u64 dev_sectors = qc->dev->n_sectors; 1530 const u8 *cdb = scmd->cmnd; 1531 u64 block; 1532 u32 n_block; 1533 1534 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1535 tf->protocol = ATA_PROT_NODATA; 1536 1537 if (cdb[0] == VERIFY) { 1538 if (scmd->cmd_len < 10) 1539 goto invalid_fld; 1540 scsi_10_lba_len(cdb, &block, &n_block); 1541 } else if (cdb[0] == VERIFY_16) { 1542 if (scmd->cmd_len < 16) 1543 goto invalid_fld; 1544 scsi_16_lba_len(cdb, &block, &n_block); 1545 } else 1546 goto invalid_fld; 1547 1548 if (!n_block) 1549 goto nothing_to_do; 1550 if (block >= dev_sectors) 1551 goto out_of_range; 1552 if ((block + n_block) > dev_sectors) 1553 goto out_of_range; 1554 1555 if (dev->flags & ATA_DFLAG_LBA) { 1556 tf->flags |= ATA_TFLAG_LBA; 1557 1558 if (lba_28_ok(block, n_block)) { 1559 /* use LBA28 */ 1560 tf->command = ATA_CMD_VERIFY; 1561 tf->device |= (block >> 24) & 0xf; 1562 } else if (lba_48_ok(block, n_block)) { 1563 if (!(dev->flags & ATA_DFLAG_LBA48)) 1564 goto out_of_range; 1565 1566 /* use LBA48 */ 1567 tf->flags |= ATA_TFLAG_LBA48; 1568 tf->command = ATA_CMD_VERIFY_EXT; 1569 1570 tf->hob_nsect = (n_block >> 8) & 0xff; 1571 1572 tf->hob_lbah = (block >> 40) & 0xff; 1573 tf->hob_lbam = (block >> 32) & 0xff; 1574 tf->hob_lbal = (block >> 24) & 0xff; 1575 } else 1576 /* request too large even for LBA48 */ 1577 goto out_of_range; 1578 1579 tf->nsect = n_block & 0xff; 1580 1581 tf->lbah = (block >> 16) & 0xff; 1582 tf->lbam = (block >> 8) & 0xff; 1583 tf->lbal = block & 0xff; 1584 1585 tf->device |= ATA_LBA; 1586 } else { 1587 /* CHS */ 1588 u32 sect, head, cyl, track; 1589 1590 if (!lba_28_ok(block, n_block)) 1591 goto out_of_range; 1592 1593 /* Convert LBA to CHS */ 1594 track = (u32)block / dev->sectors; 1595 cyl = track / dev->heads; 1596 head = track % dev->heads; 1597 sect = (u32)block % dev->sectors + 1; 1598 1599 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1600 (u32)block, track, cyl, head, sect); 1601 1602 /* Check whether the converted CHS can fit. 1603 Cylinder: 0-65535 1604 Head: 0-15 1605 Sector: 1-255*/ 1606 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1607 goto out_of_range; 1608 1609 tf->command = ATA_CMD_VERIFY; 1610 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1611 tf->lbal = sect; 1612 tf->lbam = cyl; 1613 tf->lbah = cyl >> 8; 1614 tf->device |= head; 1615 } 1616 1617 return 0; 1618 1619 invalid_fld: 1620 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1621 /* "Invalid field in cbd" */ 1622 return 1; 1623 1624 out_of_range: 1625 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1626 /* "Logical Block Address out of range" */ 1627 return 1; 1628 1629 nothing_to_do: 1630 scmd->result = SAM_STAT_GOOD; 1631 return 1; 1632 } 1633 1634 /** 1635 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1636 * @qc: Storage for translated ATA taskfile 1637 * 1638 * Converts any of six SCSI read/write commands into the 1639 * ATA counterpart, including starting sector (LBA), 1640 * sector count, and taking into account the device's LBA48 1641 * support. 1642 * 1643 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1644 * %WRITE_16 are currently supported. 1645 * 1646 * LOCKING: 1647 * spin_lock_irqsave(host lock) 1648 * 1649 * RETURNS: 1650 * Zero on success, non-zero on error. 1651 */ 1652 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1653 { 1654 struct scsi_cmnd *scmd = qc->scsicmd; 1655 const u8 *cdb = scmd->cmnd; 1656 unsigned int tf_flags = 0; 1657 u64 block; 1658 u32 n_block; 1659 int rc; 1660 1661 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1662 tf_flags |= ATA_TFLAG_WRITE; 1663 1664 /* Calculate the SCSI LBA, transfer length and FUA. */ 1665 switch (cdb[0]) { 1666 case READ_10: 1667 case WRITE_10: 1668 if (unlikely(scmd->cmd_len < 10)) 1669 goto invalid_fld; 1670 scsi_10_lba_len(cdb, &block, &n_block); 1671 if (cdb[1] & (1 << 3)) 1672 tf_flags |= ATA_TFLAG_FUA; 1673 break; 1674 case READ_6: 1675 case WRITE_6: 1676 if (unlikely(scmd->cmd_len < 6)) 1677 goto invalid_fld; 1678 scsi_6_lba_len(cdb, &block, &n_block); 1679 1680 /* for 6-byte r/w commands, transfer length 0 1681 * means 256 blocks of data, not 0 block. 1682 */ 1683 if (!n_block) 1684 n_block = 256; 1685 break; 1686 case READ_16: 1687 case WRITE_16: 1688 if (unlikely(scmd->cmd_len < 16)) 1689 goto invalid_fld; 1690 scsi_16_lba_len(cdb, &block, &n_block); 1691 if (cdb[1] & (1 << 3)) 1692 tf_flags |= ATA_TFLAG_FUA; 1693 break; 1694 default: 1695 DPRINTK("no-byte command\n"); 1696 goto invalid_fld; 1697 } 1698 1699 /* Check and compose ATA command */ 1700 if (!n_block) 1701 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1702 * length 0 means transfer 0 block of data. 1703 * However, for ATA R/W commands, sector count 0 means 1704 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1705 * 1706 * WARNING: one or two older ATA drives treat 0 as 0... 1707 */ 1708 goto nothing_to_do; 1709 1710 qc->flags |= ATA_QCFLAG_IO; 1711 qc->nbytes = n_block * scmd->device->sector_size; 1712 1713 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1714 qc->tag); 1715 if (likely(rc == 0)) 1716 return 0; 1717 1718 if (rc == -ERANGE) 1719 goto out_of_range; 1720 /* treat all other errors as -EINVAL, fall through */ 1721 invalid_fld: 1722 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1723 /* "Invalid field in cbd" */ 1724 return 1; 1725 1726 out_of_range: 1727 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1728 /* "Logical Block Address out of range" */ 1729 return 1; 1730 1731 nothing_to_do: 1732 scmd->result = SAM_STAT_GOOD; 1733 return 1; 1734 } 1735 1736 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1737 { 1738 struct ata_port *ap = qc->ap; 1739 struct scsi_cmnd *cmd = qc->scsicmd; 1740 u8 *cdb = cmd->cmnd; 1741 int need_sense = (qc->err_mask != 0); 1742 1743 /* For ATA pass thru (SAT) commands, generate a sense block if 1744 * user mandated it or if there's an error. Note that if we 1745 * generate because the user forced us to [CK_COND =1], a check 1746 * condition is generated and the ATA register values are returned 1747 * whether the command completed successfully or not. If there 1748 * was no error, we use the following sense data: 1749 * sk = RECOVERED ERROR 1750 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE 1751 */ 1752 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1753 ((cdb[2] & 0x20) || need_sense)) { 1754 ata_gen_passthru_sense(qc); 1755 } else { 1756 if (!need_sense) { 1757 cmd->result = SAM_STAT_GOOD; 1758 } else { 1759 /* TODO: decide which descriptor format to use 1760 * for 48b LBA devices and call that here 1761 * instead of the fixed desc, which is only 1762 * good for smaller LBA (and maybe CHS?) 1763 * devices. 1764 */ 1765 ata_gen_ata_sense(qc); 1766 } 1767 } 1768 1769 if (need_sense && !ap->ops->error_handler) 1770 ata_dump_status(ap->print_id, &qc->result_tf); 1771 1772 qc->scsidone(cmd); 1773 1774 ata_qc_free(qc); 1775 } 1776 1777 /** 1778 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1779 * @dev: ATA device to which the command is addressed 1780 * @cmd: SCSI command to execute 1781 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1782 * 1783 * Our ->queuecommand() function has decided that the SCSI 1784 * command issued can be directly translated into an ATA 1785 * command, rather than handled internally. 1786 * 1787 * This function sets up an ata_queued_cmd structure for the 1788 * SCSI command, and sends that ata_queued_cmd to the hardware. 1789 * 1790 * The xlat_func argument (actor) returns 0 if ready to execute 1791 * ATA command, else 1 to finish translation. If 1 is returned 1792 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1793 * to be set reflecting an error condition or clean (early) 1794 * termination. 1795 * 1796 * LOCKING: 1797 * spin_lock_irqsave(host lock) 1798 * 1799 * RETURNS: 1800 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1801 * needs to be deferred. 1802 */ 1803 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1804 ata_xlat_func_t xlat_func) 1805 { 1806 struct ata_port *ap = dev->link->ap; 1807 struct ata_queued_cmd *qc; 1808 int rc; 1809 1810 VPRINTK("ENTER\n"); 1811 1812 qc = ata_scsi_qc_new(dev, cmd); 1813 if (!qc) 1814 goto err_mem; 1815 1816 /* data is present; dma-map it */ 1817 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1818 cmd->sc_data_direction == DMA_TO_DEVICE) { 1819 if (unlikely(scsi_bufflen(cmd) < 1)) { 1820 ata_dev_warn(dev, "WARNING: zero len r/w req\n"); 1821 goto err_did; 1822 } 1823 1824 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); 1825 1826 qc->dma_dir = cmd->sc_data_direction; 1827 } 1828 1829 qc->complete_fn = ata_scsi_qc_complete; 1830 1831 if (xlat_func(qc)) 1832 goto early_finish; 1833 1834 if (ap->ops->qc_defer) { 1835 if ((rc = ap->ops->qc_defer(qc))) 1836 goto defer; 1837 } 1838 1839 /* select device, send command to hardware */ 1840 ata_qc_issue(qc); 1841 1842 VPRINTK("EXIT\n"); 1843 return 0; 1844 1845 early_finish: 1846 ata_qc_free(qc); 1847 cmd->scsi_done(cmd); 1848 DPRINTK("EXIT - early finish (good or error)\n"); 1849 return 0; 1850 1851 err_did: 1852 ata_qc_free(qc); 1853 cmd->result = (DID_ERROR << 16); 1854 cmd->scsi_done(cmd); 1855 err_mem: 1856 DPRINTK("EXIT - internal\n"); 1857 return 0; 1858 1859 defer: 1860 ata_qc_free(qc); 1861 DPRINTK("EXIT - defer\n"); 1862 if (rc == ATA_DEFER_LINK) 1863 return SCSI_MLQUEUE_DEVICE_BUSY; 1864 else 1865 return SCSI_MLQUEUE_HOST_BUSY; 1866 } 1867 1868 /** 1869 * ata_scsi_rbuf_get - Map response buffer. 1870 * @cmd: SCSI command containing buffer to be mapped. 1871 * @flags: unsigned long variable to store irq enable status 1872 * @copy_in: copy in from user buffer 1873 * 1874 * Prepare buffer for simulated SCSI commands. 1875 * 1876 * LOCKING: 1877 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success 1878 * 1879 * RETURNS: 1880 * Pointer to response buffer. 1881 */ 1882 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in, 1883 unsigned long *flags) 1884 { 1885 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags); 1886 1887 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); 1888 if (copy_in) 1889 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1890 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1891 return ata_scsi_rbuf; 1892 } 1893 1894 /** 1895 * ata_scsi_rbuf_put - Unmap response buffer. 1896 * @cmd: SCSI command containing buffer to be unmapped. 1897 * @copy_out: copy out result 1898 * @flags: @flags passed to ata_scsi_rbuf_get() 1899 * 1900 * Returns rbuf buffer. The result is copied to @cmd's buffer if 1901 * @copy_back is true. 1902 * 1903 * LOCKING: 1904 * Unlocks ata_scsi_rbuf_lock. 1905 */ 1906 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out, 1907 unsigned long *flags) 1908 { 1909 if (copy_out) 1910 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 1911 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); 1912 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags); 1913 } 1914 1915 /** 1916 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1917 * @args: device IDENTIFY data / SCSI command of interest. 1918 * @actor: Callback hook for desired SCSI command simulator 1919 * 1920 * Takes care of the hard work of simulating a SCSI command... 1921 * Mapping the response buffer, calling the command's handler, 1922 * and handling the handler's return value. This return value 1923 * indicates whether the handler wishes the SCSI command to be 1924 * completed successfully (0), or not (in which case cmd->result 1925 * and sense buffer are assumed to be set). 1926 * 1927 * LOCKING: 1928 * spin_lock_irqsave(host lock) 1929 */ 1930 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1931 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) 1932 { 1933 u8 *rbuf; 1934 unsigned int rc; 1935 struct scsi_cmnd *cmd = args->cmd; 1936 unsigned long flags; 1937 1938 rbuf = ata_scsi_rbuf_get(cmd, false, &flags); 1939 rc = actor(args, rbuf); 1940 ata_scsi_rbuf_put(cmd, rc == 0, &flags); 1941 1942 if (rc == 0) 1943 cmd->result = SAM_STAT_GOOD; 1944 args->done(cmd); 1945 } 1946 1947 /** 1948 * ata_scsiop_inq_std - Simulate INQUIRY command 1949 * @args: device IDENTIFY data / SCSI command of interest. 1950 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1951 * 1952 * Returns standard device identification data associated 1953 * with non-VPD INQUIRY command output. 1954 * 1955 * LOCKING: 1956 * spin_lock_irqsave(host lock) 1957 */ 1958 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) 1959 { 1960 const u8 versions[] = { 1961 0x60, /* SAM-3 (no version claimed) */ 1962 1963 0x03, 1964 0x20, /* SBC-2 (no version claimed) */ 1965 1966 0x02, 1967 0x60 /* SPC-3 (no version claimed) */ 1968 }; 1969 u8 hdr[] = { 1970 TYPE_DISK, 1971 0, 1972 0x5, /* claim SPC-3 version compatibility */ 1973 2, 1974 95 - 4 1975 }; 1976 1977 VPRINTK("ENTER\n"); 1978 1979 /* set scsi removeable (RMB) bit per ata bit */ 1980 if (ata_id_removeable(args->id)) 1981 hdr[1] |= (1 << 7); 1982 1983 memcpy(rbuf, hdr, sizeof(hdr)); 1984 memcpy(&rbuf[8], "ATA ", 8); 1985 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1986 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1987 1988 if (rbuf[32] == 0 || rbuf[32] == ' ') 1989 memcpy(&rbuf[32], "n/a ", 4); 1990 1991 memcpy(rbuf + 59, versions, sizeof(versions)); 1992 1993 return 0; 1994 } 1995 1996 /** 1997 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1998 * @args: device IDENTIFY data / SCSI command of interest. 1999 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2000 * 2001 * Returns list of inquiry VPD pages available. 2002 * 2003 * LOCKING: 2004 * spin_lock_irqsave(host lock) 2005 */ 2006 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 2007 { 2008 const u8 pages[] = { 2009 0x00, /* page 0x00, this page */ 2010 0x80, /* page 0x80, unit serial no page */ 2011 0x83, /* page 0x83, device ident page */ 2012 0x89, /* page 0x89, ata info page */ 2013 0xb0, /* page 0xb0, block limits page */ 2014 0xb1, /* page 0xb1, block device characteristics page */ 2015 0xb2, /* page 0xb2, thin provisioning page */ 2016 }; 2017 2018 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 2019 memcpy(rbuf + 4, pages, sizeof(pages)); 2020 return 0; 2021 } 2022 2023 /** 2024 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 2025 * @args: device IDENTIFY data / SCSI command of interest. 2026 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2027 * 2028 * Returns ATA device serial number. 2029 * 2030 * LOCKING: 2031 * spin_lock_irqsave(host lock) 2032 */ 2033 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) 2034 { 2035 const u8 hdr[] = { 2036 0, 2037 0x80, /* this page code */ 2038 0, 2039 ATA_ID_SERNO_LEN, /* page len */ 2040 }; 2041 2042 memcpy(rbuf, hdr, sizeof(hdr)); 2043 ata_id_string(args->id, (unsigned char *) &rbuf[4], 2044 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2045 return 0; 2046 } 2047 2048 /** 2049 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 2050 * @args: device IDENTIFY data / SCSI command of interest. 2051 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2052 * 2053 * Yields two logical unit device identification designators: 2054 * - vendor specific ASCII containing the ATA serial number 2055 * - SAT defined "t10 vendor id based" containing ASCII vendor 2056 * name ("ATA "), model and serial numbers. 2057 * 2058 * LOCKING: 2059 * spin_lock_irqsave(host lock) 2060 */ 2061 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) 2062 { 2063 const int sat_model_serial_desc_len = 68; 2064 int num; 2065 2066 rbuf[1] = 0x83; /* this page code */ 2067 num = 4; 2068 2069 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 2070 rbuf[num + 0] = 2; 2071 rbuf[num + 3] = ATA_ID_SERNO_LEN; 2072 num += 4; 2073 ata_id_string(args->id, (unsigned char *) rbuf + num, 2074 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 2075 num += ATA_ID_SERNO_LEN; 2076 2077 /* SAT defined lu model and serial numbers descriptor */ 2078 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 2079 rbuf[num + 0] = 2; 2080 rbuf[num + 1] = 1; 2081 rbuf[num + 3] = sat_model_serial_desc_len; 2082 num += 4; 2083 memcpy(rbuf + num, "ATA ", 8); 2084 num += 8; 2085 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, 2086 ATA_ID_PROD_LEN); 2087 num += ATA_ID_PROD_LEN; 2088 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, 2089 ATA_ID_SERNO_LEN); 2090 num += ATA_ID_SERNO_LEN; 2091 2092 if (ata_id_has_wwn(args->id)) { 2093 /* SAT defined lu world wide name */ 2094 /* piv=0, assoc=lu, code_set=binary, designator=NAA */ 2095 rbuf[num + 0] = 1; 2096 rbuf[num + 1] = 3; 2097 rbuf[num + 3] = ATA_ID_WWN_LEN; 2098 num += 4; 2099 ata_id_string(args->id, (unsigned char *) rbuf + num, 2100 ATA_ID_WWN, ATA_ID_WWN_LEN); 2101 num += ATA_ID_WWN_LEN; 2102 } 2103 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 2104 return 0; 2105 } 2106 2107 /** 2108 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info 2109 * @args: device IDENTIFY data / SCSI command of interest. 2110 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2111 * 2112 * Yields SAT-specified ATA VPD page. 2113 * 2114 * LOCKING: 2115 * spin_lock_irqsave(host lock) 2116 */ 2117 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) 2118 { 2119 struct ata_taskfile tf; 2120 2121 memset(&tf, 0, sizeof(tf)); 2122 2123 rbuf[1] = 0x89; /* our page code */ 2124 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ 2125 rbuf[3] = (0x238 & 0xff); 2126 2127 memcpy(&rbuf[8], "linux ", 8); 2128 memcpy(&rbuf[16], "libata ", 16); 2129 memcpy(&rbuf[32], DRV_VERSION, 4); 2130 2131 /* we don't store the ATA device signature, so we fake it */ 2132 2133 tf.command = ATA_DRDY; /* really, this is Status reg */ 2134 tf.lbal = 0x1; 2135 tf.nsect = 0x1; 2136 2137 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */ 2138 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ 2139 2140 rbuf[56] = ATA_CMD_ID_ATA; 2141 2142 memcpy(&rbuf[60], &args->id[0], 512); 2143 return 0; 2144 } 2145 2146 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) 2147 { 2148 u16 min_io_sectors; 2149 2150 rbuf[1] = 0xb0; 2151 rbuf[3] = 0x3c; /* required VPD size with unmap support */ 2152 2153 /* 2154 * Optimal transfer length granularity. 2155 * 2156 * This is always one physical block, but for disks with a smaller 2157 * logical than physical sector size we need to figure out what the 2158 * latter is. 2159 */ 2160 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); 2161 put_unaligned_be16(min_io_sectors, &rbuf[6]); 2162 2163 /* 2164 * Optimal unmap granularity. 2165 * 2166 * The ATA spec doesn't even know about a granularity or alignment 2167 * for the TRIM command. We can leave away most of the unmap related 2168 * VPD page entries, but we have specifify a granularity to signal 2169 * that we support some form of unmap - in thise case via WRITE SAME 2170 * with the unmap bit set. 2171 */ 2172 if (ata_id_has_trim(args->id)) { 2173 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]); 2174 put_unaligned_be32(1, &rbuf[28]); 2175 } 2176 2177 return 0; 2178 } 2179 2180 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 2181 { 2182 int form_factor = ata_id_form_factor(args->id); 2183 int media_rotation_rate = ata_id_rotation_rate(args->id); 2184 2185 rbuf[1] = 0xb1; 2186 rbuf[3] = 0x3c; 2187 rbuf[4] = media_rotation_rate >> 8; 2188 rbuf[5] = media_rotation_rate; 2189 rbuf[7] = form_factor; 2190 2191 return 0; 2192 } 2193 2194 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) 2195 { 2196 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ 2197 rbuf[1] = 0xb2; 2198 rbuf[3] = 0x4; 2199 rbuf[5] = 1 << 6; /* TPWS */ 2200 2201 return 0; 2202 } 2203 2204 /** 2205 * ata_scsiop_noop - Command handler that simply returns success. 2206 * @args: device IDENTIFY data / SCSI command of interest. 2207 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2208 * 2209 * No operation. Simply returns success to caller, to indicate 2210 * that the caller should successfully complete this SCSI command. 2211 * 2212 * LOCKING: 2213 * spin_lock_irqsave(host lock) 2214 */ 2215 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf) 2216 { 2217 VPRINTK("ENTER\n"); 2218 return 0; 2219 } 2220 2221 /** 2222 * modecpy - Prepare response for MODE SENSE 2223 * @dest: output buffer 2224 * @src: data being copied 2225 * @n: length of mode page 2226 * @changeable: whether changeable parameters are requested 2227 * 2228 * Generate a generic MODE SENSE page for either current or changeable 2229 * parameters. 2230 * 2231 * LOCKING: 2232 * None. 2233 */ 2234 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) 2235 { 2236 if (changeable) { 2237 memcpy(dest, src, 2); 2238 memset(dest + 2, 0, n - 2); 2239 } else { 2240 memcpy(dest, src, n); 2241 } 2242 } 2243 2244 /** 2245 * ata_msense_caching - Simulate MODE SENSE caching info page 2246 * @id: device IDENTIFY data 2247 * @buf: output buffer 2248 * @changeable: whether changeable parameters are requested 2249 * 2250 * Generate a caching info page, which conditionally indicates 2251 * write caching to the SCSI layer, depending on device 2252 * capabilities. 2253 * 2254 * LOCKING: 2255 * None. 2256 */ 2257 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) 2258 { 2259 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); 2260 if (changeable || ata_id_wcache_enabled(id)) 2261 buf[2] |= (1 << 2); /* write cache enable */ 2262 if (!changeable && !ata_id_rahead_enabled(id)) 2263 buf[12] |= (1 << 5); /* disable read ahead */ 2264 return sizeof(def_cache_mpage); 2265 } 2266 2267 /** 2268 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 2269 * @buf: output buffer 2270 * @changeable: whether changeable parameters are requested 2271 * 2272 * Generate a generic MODE SENSE control mode page. 2273 * 2274 * LOCKING: 2275 * None. 2276 */ 2277 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable) 2278 { 2279 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); 2280 return sizeof(def_control_mpage); 2281 } 2282 2283 /** 2284 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 2285 * @buf: output buffer 2286 * @changeable: whether changeable parameters are requested 2287 * 2288 * Generate a generic MODE SENSE r/w error recovery page. 2289 * 2290 * LOCKING: 2291 * None. 2292 */ 2293 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) 2294 { 2295 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), 2296 changeable); 2297 return sizeof(def_rw_recovery_mpage); 2298 } 2299 2300 /* 2301 * We can turn this into a real blacklist if it's needed, for now just 2302 * blacklist any Maxtor BANC1G10 revision firmware 2303 */ 2304 static int ata_dev_supports_fua(u16 *id) 2305 { 2306 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2307 2308 if (!libata_fua) 2309 return 0; 2310 if (!ata_id_has_fua(id)) 2311 return 0; 2312 2313 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2314 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2315 2316 if (strcmp(model, "Maxtor")) 2317 return 1; 2318 if (strcmp(fw, "BANC1G10")) 2319 return 1; 2320 2321 return 0; /* blacklisted */ 2322 } 2323 2324 /** 2325 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2326 * @args: device IDENTIFY data / SCSI command of interest. 2327 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2328 * 2329 * Simulate MODE SENSE commands. Assume this is invoked for direct 2330 * access devices (e.g. disks) only. There should be no block 2331 * descriptor for other device types. 2332 * 2333 * LOCKING: 2334 * spin_lock_irqsave(host lock) 2335 */ 2336 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) 2337 { 2338 struct ata_device *dev = args->dev; 2339 u8 *scsicmd = args->cmd->cmnd, *p = rbuf; 2340 const u8 sat_blk_desc[] = { 2341 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2342 0, 2343 0, 0x2, 0x0 /* block length: 512 bytes */ 2344 }; 2345 u8 pg, spg; 2346 unsigned int ebd, page_control, six_byte; 2347 u8 dpofua; 2348 2349 VPRINTK("ENTER\n"); 2350 2351 six_byte = (scsicmd[0] == MODE_SENSE); 2352 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2353 /* 2354 * LLBA bit in msense(10) ignored (compliant) 2355 */ 2356 2357 page_control = scsicmd[2] >> 6; 2358 switch (page_control) { 2359 case 0: /* current */ 2360 case 1: /* changeable */ 2361 case 2: /* defaults */ 2362 break; /* supported */ 2363 case 3: /* saved */ 2364 goto saving_not_supp; 2365 default: 2366 goto invalid_fld; 2367 } 2368 2369 if (six_byte) 2370 p += 4 + (ebd ? 8 : 0); 2371 else 2372 p += 8 + (ebd ? 8 : 0); 2373 2374 pg = scsicmd[2] & 0x3f; 2375 spg = scsicmd[3]; 2376 /* 2377 * No mode subpages supported (yet) but asking for _all_ 2378 * subpages may be valid 2379 */ 2380 if (spg && (spg != ALL_SUB_MPAGES)) 2381 goto invalid_fld; 2382 2383 switch(pg) { 2384 case RW_RECOVERY_MPAGE: 2385 p += ata_msense_rw_recovery(p, page_control == 1); 2386 break; 2387 2388 case CACHE_MPAGE: 2389 p += ata_msense_caching(args->id, p, page_control == 1); 2390 break; 2391 2392 case CONTROL_MPAGE: 2393 p += ata_msense_ctl_mode(p, page_control == 1); 2394 break; 2395 2396 case ALL_MPAGES: 2397 p += ata_msense_rw_recovery(p, page_control == 1); 2398 p += ata_msense_caching(args->id, p, page_control == 1); 2399 p += ata_msense_ctl_mode(p, page_control == 1); 2400 break; 2401 2402 default: /* invalid page code */ 2403 goto invalid_fld; 2404 } 2405 2406 dpofua = 0; 2407 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2408 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2409 dpofua = 1 << 4; 2410 2411 if (six_byte) { 2412 rbuf[0] = p - rbuf - 1; 2413 rbuf[2] |= dpofua; 2414 if (ebd) { 2415 rbuf[3] = sizeof(sat_blk_desc); 2416 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); 2417 } 2418 } else { 2419 unsigned int output_len = p - rbuf - 2; 2420 2421 rbuf[0] = output_len >> 8; 2422 rbuf[1] = output_len; 2423 rbuf[3] |= dpofua; 2424 if (ebd) { 2425 rbuf[7] = sizeof(sat_blk_desc); 2426 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); 2427 } 2428 } 2429 return 0; 2430 2431 invalid_fld: 2432 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2433 /* "Invalid field in cbd" */ 2434 return 1; 2435 2436 saving_not_supp: 2437 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2438 /* "Saving parameters not supported" */ 2439 return 1; 2440 } 2441 2442 /** 2443 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2444 * @args: device IDENTIFY data / SCSI command of interest. 2445 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2446 * 2447 * Simulate READ CAPACITY commands. 2448 * 2449 * LOCKING: 2450 * None. 2451 */ 2452 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) 2453 { 2454 struct ata_device *dev = args->dev; 2455 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ 2456 u32 sector_size; /* physical sector size in bytes */ 2457 u8 log2_per_phys; 2458 u16 lowest_aligned; 2459 2460 sector_size = ata_id_logical_sector_size(dev->id); 2461 log2_per_phys = ata_id_log2_per_physical_sector(dev->id); 2462 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); 2463 2464 VPRINTK("ENTER\n"); 2465 2466 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2467 if (last_lba >= 0xffffffffULL) 2468 last_lba = 0xffffffff; 2469 2470 /* sector count, 32-bit */ 2471 rbuf[0] = last_lba >> (8 * 3); 2472 rbuf[1] = last_lba >> (8 * 2); 2473 rbuf[2] = last_lba >> (8 * 1); 2474 rbuf[3] = last_lba; 2475 2476 /* sector size */ 2477 rbuf[4] = sector_size >> (8 * 3); 2478 rbuf[5] = sector_size >> (8 * 2); 2479 rbuf[6] = sector_size >> (8 * 1); 2480 rbuf[7] = sector_size; 2481 } else { 2482 /* sector count, 64-bit */ 2483 rbuf[0] = last_lba >> (8 * 7); 2484 rbuf[1] = last_lba >> (8 * 6); 2485 rbuf[2] = last_lba >> (8 * 5); 2486 rbuf[3] = last_lba >> (8 * 4); 2487 rbuf[4] = last_lba >> (8 * 3); 2488 rbuf[5] = last_lba >> (8 * 2); 2489 rbuf[6] = last_lba >> (8 * 1); 2490 rbuf[7] = last_lba; 2491 2492 /* sector size */ 2493 rbuf[ 8] = sector_size >> (8 * 3); 2494 rbuf[ 9] = sector_size >> (8 * 2); 2495 rbuf[10] = sector_size >> (8 * 1); 2496 rbuf[11] = sector_size; 2497 2498 rbuf[12] = 0; 2499 rbuf[13] = log2_per_phys; 2500 rbuf[14] = (lowest_aligned >> 8) & 0x3f; 2501 rbuf[15] = lowest_aligned; 2502 2503 if (ata_id_has_trim(args->id)) { 2504 rbuf[14] |= 0x80; /* TPE */ 2505 2506 if (ata_id_has_zero_after_trim(args->id)) 2507 rbuf[14] |= 0x40; /* TPRZ */ 2508 } 2509 } 2510 2511 return 0; 2512 } 2513 2514 /** 2515 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2516 * @args: device IDENTIFY data / SCSI command of interest. 2517 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2518 * 2519 * Simulate REPORT LUNS command. 2520 * 2521 * LOCKING: 2522 * spin_lock_irqsave(host lock) 2523 */ 2524 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) 2525 { 2526 VPRINTK("ENTER\n"); 2527 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2528 2529 return 0; 2530 } 2531 2532 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2533 { 2534 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2535 /* FIXME: not quite right; we don't want the 2536 * translation of taskfile registers into 2537 * a sense descriptors, since that's only 2538 * correct for ATA, not ATAPI 2539 */ 2540 ata_gen_passthru_sense(qc); 2541 } 2542 2543 qc->scsidone(qc->scsicmd); 2544 ata_qc_free(qc); 2545 } 2546 2547 /* is it pointless to prefer PIO for "safety reasons"? */ 2548 static inline int ata_pio_use_silly(struct ata_port *ap) 2549 { 2550 return (ap->flags & ATA_FLAG_PIO_DMA); 2551 } 2552 2553 static void atapi_request_sense(struct ata_queued_cmd *qc) 2554 { 2555 struct ata_port *ap = qc->ap; 2556 struct scsi_cmnd *cmd = qc->scsicmd; 2557 2558 DPRINTK("ATAPI request sense\n"); 2559 2560 /* FIXME: is this needed? */ 2561 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2562 2563 #ifdef CONFIG_ATA_SFF 2564 if (ap->ops->sff_tf_read) 2565 ap->ops->sff_tf_read(ap, &qc->tf); 2566 #endif 2567 2568 /* fill these in, for the case where they are -not- overwritten */ 2569 cmd->sense_buffer[0] = 0x70; 2570 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2571 2572 ata_qc_reinit(qc); 2573 2574 /* setup sg table and init transfer direction */ 2575 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); 2576 ata_sg_init(qc, &qc->sgent, 1); 2577 qc->dma_dir = DMA_FROM_DEVICE; 2578 2579 memset(&qc->cdb, 0, qc->dev->cdb_len); 2580 qc->cdb[0] = REQUEST_SENSE; 2581 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2582 2583 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2584 qc->tf.command = ATA_CMD_PACKET; 2585 2586 if (ata_pio_use_silly(ap)) { 2587 qc->tf.protocol = ATAPI_PROT_DMA; 2588 qc->tf.feature |= ATAPI_PKT_DMA; 2589 } else { 2590 qc->tf.protocol = ATAPI_PROT_PIO; 2591 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; 2592 qc->tf.lbah = 0; 2593 } 2594 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2595 2596 qc->complete_fn = atapi_sense_complete; 2597 2598 ata_qc_issue(qc); 2599 2600 DPRINTK("EXIT\n"); 2601 } 2602 2603 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2604 { 2605 struct scsi_cmnd *cmd = qc->scsicmd; 2606 unsigned int err_mask = qc->err_mask; 2607 2608 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2609 2610 /* handle completion from new EH */ 2611 if (unlikely(qc->ap->ops->error_handler && 2612 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2613 2614 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2615 /* FIXME: not quite right; we don't want the 2616 * translation of taskfile registers into a 2617 * sense descriptors, since that's only 2618 * correct for ATA, not ATAPI 2619 */ 2620 ata_gen_passthru_sense(qc); 2621 } 2622 2623 /* SCSI EH automatically locks door if sdev->locked is 2624 * set. Sometimes door lock request continues to 2625 * fail, for example, when no media is present. This 2626 * creates a loop - SCSI EH issues door lock which 2627 * fails and gets invoked again to acquire sense data 2628 * for the failed command. 2629 * 2630 * If door lock fails, always clear sdev->locked to 2631 * avoid this infinite loop. 2632 * 2633 * This may happen before SCSI scan is complete. Make 2634 * sure qc->dev->sdev isn't NULL before dereferencing. 2635 */ 2636 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) 2637 qc->dev->sdev->locked = 0; 2638 2639 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2640 qc->scsidone(cmd); 2641 ata_qc_free(qc); 2642 return; 2643 } 2644 2645 /* successful completion or old EH failure path */ 2646 if (unlikely(err_mask & AC_ERR_DEV)) { 2647 cmd->result = SAM_STAT_CHECK_CONDITION; 2648 atapi_request_sense(qc); 2649 return; 2650 } else if (unlikely(err_mask)) { 2651 /* FIXME: not quite right; we don't want the 2652 * translation of taskfile registers into 2653 * a sense descriptors, since that's only 2654 * correct for ATA, not ATAPI 2655 */ 2656 ata_gen_passthru_sense(qc); 2657 } else { 2658 u8 *scsicmd = cmd->cmnd; 2659 2660 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2661 unsigned long flags; 2662 u8 *buf; 2663 2664 buf = ata_scsi_rbuf_get(cmd, true, &flags); 2665 2666 /* ATAPI devices typically report zero for their SCSI version, 2667 * and sometimes deviate from the spec WRT response data 2668 * format. If SCSI version is reported as zero like normal, 2669 * then we make the following fixups: 1) Fake MMC-5 version, 2670 * to indicate to the Linux scsi midlayer this is a modern 2671 * device. 2) Ensure response data format / ATAPI information 2672 * are always correct. 2673 */ 2674 if (buf[2] == 0) { 2675 buf[2] = 0x5; 2676 buf[3] = 0x32; 2677 } 2678 2679 ata_scsi_rbuf_put(cmd, true, &flags); 2680 } 2681 2682 cmd->result = SAM_STAT_GOOD; 2683 } 2684 2685 qc->scsidone(cmd); 2686 ata_qc_free(qc); 2687 } 2688 /** 2689 * atapi_xlat - Initialize PACKET taskfile 2690 * @qc: command structure to be initialized 2691 * 2692 * LOCKING: 2693 * spin_lock_irqsave(host lock) 2694 * 2695 * RETURNS: 2696 * Zero on success, non-zero on failure. 2697 */ 2698 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2699 { 2700 struct scsi_cmnd *scmd = qc->scsicmd; 2701 struct ata_device *dev = qc->dev; 2702 int nodata = (scmd->sc_data_direction == DMA_NONE); 2703 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); 2704 unsigned int nbytes; 2705 2706 memset(qc->cdb, 0, dev->cdb_len); 2707 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2708 2709 qc->complete_fn = atapi_qc_complete; 2710 2711 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2712 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2713 qc->tf.flags |= ATA_TFLAG_WRITE; 2714 DPRINTK("direction: write\n"); 2715 } 2716 2717 qc->tf.command = ATA_CMD_PACKET; 2718 ata_qc_set_pc_nbytes(qc); 2719 2720 /* check whether ATAPI DMA is safe */ 2721 if (!nodata && !using_pio && atapi_check_dma(qc)) 2722 using_pio = 1; 2723 2724 /* Some controller variants snoop this value for Packet 2725 * transfers to do state machine and FIFO management. Thus we 2726 * want to set it properly, and for DMA where it is 2727 * effectively meaningless. 2728 */ 2729 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); 2730 2731 /* Most ATAPI devices which honor transfer chunk size don't 2732 * behave according to the spec when odd chunk size which 2733 * matches the transfer length is specified. If the number of 2734 * bytes to transfer is 2n+1. According to the spec, what 2735 * should happen is to indicate that 2n+1 is going to be 2736 * transferred and transfer 2n+2 bytes where the last byte is 2737 * padding. 2738 * 2739 * In practice, this doesn't happen. ATAPI devices first 2740 * indicate and transfer 2n bytes and then indicate and 2741 * transfer 2 bytes where the last byte is padding. 2742 * 2743 * This inconsistency confuses several controllers which 2744 * perform PIO using DMA such as Intel AHCIs and sil3124/32. 2745 * These controllers use actual number of transferred bytes to 2746 * update DMA poitner and transfer of 4n+2 bytes make those 2747 * controller push DMA pointer by 4n+4 bytes because SATA data 2748 * FISes are aligned to 4 bytes. This causes data corruption 2749 * and buffer overrun. 2750 * 2751 * Always setting nbytes to even number solves this problem 2752 * because then ATAPI devices don't have to split data at 2n 2753 * boundaries. 2754 */ 2755 if (nbytes & 0x1) 2756 nbytes++; 2757 2758 qc->tf.lbam = (nbytes & 0xFF); 2759 qc->tf.lbah = (nbytes >> 8); 2760 2761 if (nodata) 2762 qc->tf.protocol = ATAPI_PROT_NODATA; 2763 else if (using_pio) 2764 qc->tf.protocol = ATAPI_PROT_PIO; 2765 else { 2766 /* DMA data xfer */ 2767 qc->tf.protocol = ATAPI_PROT_DMA; 2768 qc->tf.feature |= ATAPI_PKT_DMA; 2769 2770 if ((dev->flags & ATA_DFLAG_DMADIR) && 2771 (scmd->sc_data_direction != DMA_TO_DEVICE)) 2772 /* some SATA bridges need us to indicate data xfer direction */ 2773 qc->tf.feature |= ATAPI_DMADIR; 2774 } 2775 2776 2777 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE 2778 as ATAPI tape drives don't get this right otherwise */ 2779 return 0; 2780 } 2781 2782 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno) 2783 { 2784 if (!sata_pmp_attached(ap)) { 2785 if (likely(devno < ata_link_max_devices(&ap->link))) 2786 return &ap->link.device[devno]; 2787 } else { 2788 if (likely(devno < ap->nr_pmp_links)) 2789 return &ap->pmp_link[devno].device[0]; 2790 } 2791 2792 return NULL; 2793 } 2794 2795 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, 2796 const struct scsi_device *scsidev) 2797 { 2798 int devno; 2799 2800 /* skip commands not addressed to targets we simulate */ 2801 if (!sata_pmp_attached(ap)) { 2802 if (unlikely(scsidev->channel || scsidev->lun)) 2803 return NULL; 2804 devno = scsidev->id; 2805 } else { 2806 if (unlikely(scsidev->id || scsidev->lun)) 2807 return NULL; 2808 devno = scsidev->channel; 2809 } 2810 2811 return ata_find_dev(ap, devno); 2812 } 2813 2814 /** 2815 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2816 * @ap: ATA port to which the device is attached 2817 * @scsidev: SCSI device from which we derive the ATA device 2818 * 2819 * Given various information provided in struct scsi_cmnd, 2820 * map that onto an ATA bus, and using that mapping 2821 * determine which ata_device is associated with the 2822 * SCSI command to be sent. 2823 * 2824 * LOCKING: 2825 * spin_lock_irqsave(host lock) 2826 * 2827 * RETURNS: 2828 * Associated ATA device, or %NULL if not found. 2829 */ 2830 static struct ata_device * 2831 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2832 { 2833 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2834 2835 if (unlikely(!dev || !ata_dev_enabled(dev))) 2836 return NULL; 2837 2838 return dev; 2839 } 2840 2841 /* 2842 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2843 * @byte1: Byte 1 from pass-thru CDB. 2844 * 2845 * RETURNS: 2846 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2847 */ 2848 static u8 2849 ata_scsi_map_proto(u8 byte1) 2850 { 2851 switch((byte1 & 0x1e) >> 1) { 2852 case 3: /* Non-data */ 2853 return ATA_PROT_NODATA; 2854 2855 case 6: /* DMA */ 2856 case 10: /* UDMA Data-in */ 2857 case 11: /* UDMA Data-Out */ 2858 return ATA_PROT_DMA; 2859 2860 case 4: /* PIO Data-in */ 2861 case 5: /* PIO Data-out */ 2862 return ATA_PROT_PIO; 2863 2864 case 0: /* Hard Reset */ 2865 case 1: /* SRST */ 2866 case 8: /* Device Diagnostic */ 2867 case 9: /* Device Reset */ 2868 case 7: /* DMA Queued */ 2869 case 12: /* FPDMA */ 2870 case 15: /* Return Response Info */ 2871 default: /* Reserved */ 2872 break; 2873 } 2874 2875 return ATA_PROT_UNKNOWN; 2876 } 2877 2878 /** 2879 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2880 * @qc: command structure to be initialized 2881 * 2882 * Handles either 12 or 16-byte versions of the CDB. 2883 * 2884 * RETURNS: 2885 * Zero on success, non-zero on failure. 2886 */ 2887 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2888 { 2889 struct ata_taskfile *tf = &(qc->tf); 2890 struct scsi_cmnd *scmd = qc->scsicmd; 2891 struct ata_device *dev = qc->dev; 2892 const u8 *cdb = scmd->cmnd; 2893 2894 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2895 goto invalid_fld; 2896 2897 /* 2898 * 12 and 16 byte CDBs use different offsets to 2899 * provide the various register values. 2900 */ 2901 if (cdb[0] == ATA_16) { 2902 /* 2903 * 16-byte CDB - may contain extended commands. 2904 * 2905 * If that is the case, copy the upper byte register values. 2906 */ 2907 if (cdb[1] & 0x01) { 2908 tf->hob_feature = cdb[3]; 2909 tf->hob_nsect = cdb[5]; 2910 tf->hob_lbal = cdb[7]; 2911 tf->hob_lbam = cdb[9]; 2912 tf->hob_lbah = cdb[11]; 2913 tf->flags |= ATA_TFLAG_LBA48; 2914 } else 2915 tf->flags &= ~ATA_TFLAG_LBA48; 2916 2917 /* 2918 * Always copy low byte, device and command registers. 2919 */ 2920 tf->feature = cdb[4]; 2921 tf->nsect = cdb[6]; 2922 tf->lbal = cdb[8]; 2923 tf->lbam = cdb[10]; 2924 tf->lbah = cdb[12]; 2925 tf->device = cdb[13]; 2926 tf->command = cdb[14]; 2927 } else { 2928 /* 2929 * 12-byte CDB - incapable of extended commands. 2930 */ 2931 tf->flags &= ~ATA_TFLAG_LBA48; 2932 2933 tf->feature = cdb[3]; 2934 tf->nsect = cdb[4]; 2935 tf->lbal = cdb[5]; 2936 tf->lbam = cdb[6]; 2937 tf->lbah = cdb[7]; 2938 tf->device = cdb[8]; 2939 tf->command = cdb[9]; 2940 } 2941 2942 /* enforce correct master/slave bit */ 2943 tf->device = dev->devno ? 2944 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2945 2946 switch (tf->command) { 2947 /* READ/WRITE LONG use a non-standard sect_size */ 2948 case ATA_CMD_READ_LONG: 2949 case ATA_CMD_READ_LONG_ONCE: 2950 case ATA_CMD_WRITE_LONG: 2951 case ATA_CMD_WRITE_LONG_ONCE: 2952 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2953 goto invalid_fld; 2954 qc->sect_size = scsi_bufflen(scmd); 2955 break; 2956 2957 /* commands using reported Logical Block size (e.g. 512 or 4K) */ 2958 case ATA_CMD_CFA_WRITE_NE: 2959 case ATA_CMD_CFA_TRANS_SECT: 2960 case ATA_CMD_CFA_WRITE_MULT_NE: 2961 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */ 2962 case ATA_CMD_READ: 2963 case ATA_CMD_READ_EXT: 2964 case ATA_CMD_READ_QUEUED: 2965 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */ 2966 case ATA_CMD_FPDMA_READ: 2967 case ATA_CMD_READ_MULTI: 2968 case ATA_CMD_READ_MULTI_EXT: 2969 case ATA_CMD_PIO_READ: 2970 case ATA_CMD_PIO_READ_EXT: 2971 case ATA_CMD_READ_STREAM_DMA_EXT: 2972 case ATA_CMD_READ_STREAM_EXT: 2973 case ATA_CMD_VERIFY: 2974 case ATA_CMD_VERIFY_EXT: 2975 case ATA_CMD_WRITE: 2976 case ATA_CMD_WRITE_EXT: 2977 case ATA_CMD_WRITE_FUA_EXT: 2978 case ATA_CMD_WRITE_QUEUED: 2979 case ATA_CMD_WRITE_QUEUED_FUA_EXT: 2980 case ATA_CMD_FPDMA_WRITE: 2981 case ATA_CMD_WRITE_MULTI: 2982 case ATA_CMD_WRITE_MULTI_EXT: 2983 case ATA_CMD_WRITE_MULTI_FUA_EXT: 2984 case ATA_CMD_PIO_WRITE: 2985 case ATA_CMD_PIO_WRITE_EXT: 2986 case ATA_CMD_WRITE_STREAM_DMA_EXT: 2987 case ATA_CMD_WRITE_STREAM_EXT: 2988 qc->sect_size = scmd->device->sector_size; 2989 break; 2990 2991 /* Everything else uses 512 byte "sectors" */ 2992 default: 2993 qc->sect_size = ATA_SECT_SIZE; 2994 } 2995 2996 /* 2997 * Set flags so that all registers will be written, pass on 2998 * write indication (used for PIO/DMA setup), result TF is 2999 * copied back and we don't whine too much about its failure. 3000 */ 3001 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 3002 if (scmd->sc_data_direction == DMA_TO_DEVICE) 3003 tf->flags |= ATA_TFLAG_WRITE; 3004 3005 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET; 3006 3007 /* 3008 * Set transfer length. 3009 * 3010 * TODO: find out if we need to do more here to 3011 * cover scatter/gather case. 3012 */ 3013 ata_qc_set_pc_nbytes(qc); 3014 3015 /* We may not issue DMA commands if no DMA mode is set */ 3016 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 3017 goto invalid_fld; 3018 3019 /* sanity check for pio multi commands */ 3020 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 3021 goto invalid_fld; 3022 3023 if (is_multi_taskfile(tf)) { 3024 unsigned int multi_count = 1 << (cdb[1] >> 5); 3025 3026 /* compare the passed through multi_count 3027 * with the cached multi_count of libata 3028 */ 3029 if (multi_count != dev->multi_count) 3030 ata_dev_warn(dev, "invalid multi_count %u ignored\n", 3031 multi_count); 3032 } 3033 3034 /* 3035 * Filter SET_FEATURES - XFER MODE command -- otherwise, 3036 * SET_FEATURES - XFER MODE must be preceded/succeeded 3037 * by an update to hardware-specific registers for each 3038 * controller (i.e. the reason for ->set_piomode(), 3039 * ->set_dmamode(), and ->post_set_mode() hooks). 3040 */ 3041 if (tf->command == ATA_CMD_SET_FEATURES && 3042 tf->feature == SETFEATURES_XFER) 3043 goto invalid_fld; 3044 3045 /* 3046 * Filter TPM commands by default. These provide an 3047 * essentially uncontrolled encrypted "back door" between 3048 * applications and the disk. Set libata.allow_tpm=1 if you 3049 * have a real reason for wanting to use them. This ensures 3050 * that installed software cannot easily mess stuff up without 3051 * user intent. DVR type users will probably ship with this enabled 3052 * for movie content management. 3053 * 3054 * Note that for ATA8 we can issue a DCS change and DCS freeze lock 3055 * for this and should do in future but that it is not sufficient as 3056 * DCS is an optional feature set. Thus we also do the software filter 3057 * so that we comply with the TC consortium stated goal that the user 3058 * can turn off TC features of their system. 3059 */ 3060 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) 3061 goto invalid_fld; 3062 3063 return 0; 3064 3065 invalid_fld: 3066 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3067 /* "Invalid field in cdb" */ 3068 return 1; 3069 } 3070 3071 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc) 3072 { 3073 struct ata_taskfile *tf = &qc->tf; 3074 struct scsi_cmnd *scmd = qc->scsicmd; 3075 struct ata_device *dev = qc->dev; 3076 const u8 *cdb = scmd->cmnd; 3077 u64 block; 3078 u32 n_block; 3079 u32 size; 3080 void *buf; 3081 3082 /* we may not issue DMA commands if no DMA mode is set */ 3083 if (unlikely(!dev->dma_mode)) 3084 goto invalid_fld; 3085 3086 if (unlikely(scmd->cmd_len < 16)) 3087 goto invalid_fld; 3088 scsi_16_lba_len(cdb, &block, &n_block); 3089 3090 /* for now we only support WRITE SAME with the unmap bit set */ 3091 if (unlikely(!(cdb[1] & 0x8))) 3092 goto invalid_fld; 3093 3094 /* 3095 * WRITE SAME always has a sector sized buffer as payload, this 3096 * should never be a multiple entry S/G list. 3097 */ 3098 if (!scsi_sg_count(scmd)) 3099 goto invalid_fld; 3100 3101 buf = page_address(sg_page(scsi_sglist(scmd))); 3102 size = ata_set_lba_range_entries(buf, 512, block, n_block); 3103 3104 tf->protocol = ATA_PROT_DMA; 3105 tf->hob_feature = 0; 3106 tf->feature = ATA_DSM_TRIM; 3107 tf->hob_nsect = (size / 512) >> 8; 3108 tf->nsect = size / 512; 3109 tf->command = ATA_CMD_DSM; 3110 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | 3111 ATA_TFLAG_WRITE; 3112 3113 ata_qc_set_pc_nbytes(qc); 3114 3115 return 0; 3116 3117 invalid_fld: 3118 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 3119 /* "Invalid field in cdb" */ 3120 return 1; 3121 } 3122 3123 /** 3124 * ata_mselect_caching - Simulate MODE SELECT for caching info page 3125 * @qc: Storage for translated ATA taskfile 3126 * @buf: input buffer 3127 * @len: number of valid bytes in the input buffer 3128 * 3129 * Prepare a taskfile to modify caching information for the device. 3130 * 3131 * LOCKING: 3132 * None. 3133 */ 3134 static int ata_mselect_caching(struct ata_queued_cmd *qc, 3135 const u8 *buf, int len) 3136 { 3137 struct ata_taskfile *tf = &qc->tf; 3138 struct ata_device *dev = qc->dev; 3139 char mpage[CACHE_MPAGE_LEN]; 3140 u8 wce; 3141 3142 /* 3143 * The first two bytes of def_cache_mpage are a header, so offsets 3144 * in mpage are off by 2 compared to buf. Same for len. 3145 */ 3146 3147 if (len != CACHE_MPAGE_LEN - 2) 3148 return -EINVAL; 3149 3150 wce = buf[0] & (1 << 2); 3151 3152 /* 3153 * Check that read-only bits are not modified. 3154 */ 3155 ata_msense_caching(dev->id, mpage, false); 3156 mpage[2] &= ~(1 << 2); 3157 mpage[2] |= wce; 3158 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0) 3159 return -EINVAL; 3160 3161 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 3162 tf->protocol = ATA_PROT_NODATA; 3163 tf->nsect = 0; 3164 tf->command = ATA_CMD_SET_FEATURES; 3165 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; 3166 return 0; 3167 } 3168 3169 /** 3170 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands 3171 * @qc: Storage for translated ATA taskfile 3172 * 3173 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. 3174 * Assume this is invoked for direct access devices (e.g. disks) only. 3175 * There should be no block descriptor for other device types. 3176 * 3177 * LOCKING: 3178 * spin_lock_irqsave(host lock) 3179 */ 3180 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) 3181 { 3182 struct scsi_cmnd *scmd = qc->scsicmd; 3183 const u8 *cdb = scmd->cmnd; 3184 const u8 *p; 3185 u8 pg, spg; 3186 unsigned six_byte, pg_len, hdr_len, bd_len; 3187 int len; 3188 3189 VPRINTK("ENTER\n"); 3190 3191 six_byte = (cdb[0] == MODE_SELECT); 3192 if (six_byte) { 3193 if (scmd->cmd_len < 5) 3194 goto invalid_fld; 3195 3196 len = cdb[4]; 3197 hdr_len = 4; 3198 } else { 3199 if (scmd->cmd_len < 9) 3200 goto invalid_fld; 3201 3202 len = (cdb[7] << 8) + cdb[8]; 3203 hdr_len = 8; 3204 } 3205 3206 /* We only support PF=1, SP=0. */ 3207 if ((cdb[1] & 0x11) != 0x10) 3208 goto invalid_fld; 3209 3210 /* Test early for possible overrun. */ 3211 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) 3212 goto invalid_param_len; 3213 3214 p = page_address(sg_page(scsi_sglist(scmd))); 3215 3216 /* Move past header and block descriptors. */ 3217 if (len < hdr_len) 3218 goto invalid_param_len; 3219 3220 if (six_byte) 3221 bd_len = p[3]; 3222 else 3223 bd_len = (p[6] << 8) + p[7]; 3224 3225 len -= hdr_len; 3226 p += hdr_len; 3227 if (len < bd_len) 3228 goto invalid_param_len; 3229 if (bd_len != 0 && bd_len != 8) 3230 goto invalid_param; 3231 3232 len -= bd_len; 3233 p += bd_len; 3234 if (len == 0) 3235 goto skip; 3236 3237 /* Parse both possible formats for the mode page headers. */ 3238 pg = p[0] & 0x3f; 3239 if (p[0] & 0x40) { 3240 if (len < 4) 3241 goto invalid_param_len; 3242 3243 spg = p[1]; 3244 pg_len = (p[2] << 8) | p[3]; 3245 p += 4; 3246 len -= 4; 3247 } else { 3248 if (len < 2) 3249 goto invalid_param_len; 3250 3251 spg = 0; 3252 pg_len = p[1]; 3253 p += 2; 3254 len -= 2; 3255 } 3256 3257 /* 3258 * No mode subpages supported (yet) but asking for _all_ 3259 * subpages may be valid 3260 */ 3261 if (spg && (spg != ALL_SUB_MPAGES)) 3262 goto invalid_param; 3263 if (pg_len > len) 3264 goto invalid_param_len; 3265 3266 switch (pg) { 3267 case CACHE_MPAGE: 3268 if (ata_mselect_caching(qc, p, pg_len) < 0) 3269 goto invalid_param; 3270 break; 3271 3272 default: /* invalid page code */ 3273 goto invalid_param; 3274 } 3275 3276 /* 3277 * Only one page has changeable data, so we only support setting one 3278 * page at a time. 3279 */ 3280 if (len > pg_len) 3281 goto invalid_param; 3282 3283 return 0; 3284 3285 invalid_fld: 3286 /* "Invalid field in CDB" */ 3287 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 3288 return 1; 3289 3290 invalid_param: 3291 /* "Invalid field in parameter list" */ 3292 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0); 3293 return 1; 3294 3295 invalid_param_len: 3296 /* "Parameter list length error" */ 3297 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0); 3298 return 1; 3299 3300 skip: 3301 scmd->result = SAM_STAT_GOOD; 3302 return 1; 3303 } 3304 3305 /** 3306 * ata_get_xlat_func - check if SCSI to ATA translation is possible 3307 * @dev: ATA device 3308 * @cmd: SCSI command opcode to consider 3309 * 3310 * Look up the SCSI command given, and determine whether the 3311 * SCSI command is to be translated or simulated. 3312 * 3313 * RETURNS: 3314 * Pointer to translation function if possible, %NULL if not. 3315 */ 3316 3317 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 3318 { 3319 switch (cmd) { 3320 case READ_6: 3321 case READ_10: 3322 case READ_16: 3323 3324 case WRITE_6: 3325 case WRITE_10: 3326 case WRITE_16: 3327 return ata_scsi_rw_xlat; 3328 3329 case WRITE_SAME_16: 3330 return ata_scsi_write_same_xlat; 3331 3332 case SYNCHRONIZE_CACHE: 3333 if (ata_try_flush_cache(dev)) 3334 return ata_scsi_flush_xlat; 3335 break; 3336 3337 case VERIFY: 3338 case VERIFY_16: 3339 return ata_scsi_verify_xlat; 3340 3341 case ATA_12: 3342 case ATA_16: 3343 return ata_scsi_pass_thru; 3344 3345 case MODE_SELECT: 3346 case MODE_SELECT_10: 3347 return ata_scsi_mode_select_xlat; 3348 break; 3349 3350 case START_STOP: 3351 return ata_scsi_start_stop_xlat; 3352 } 3353 3354 return NULL; 3355 } 3356 3357 /** 3358 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 3359 * @ap: ATA port to which the command was being sent 3360 * @cmd: SCSI command to dump 3361 * 3362 * Prints the contents of a SCSI command via printk(). 3363 */ 3364 3365 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 3366 struct scsi_cmnd *cmd) 3367 { 3368 #ifdef ATA_DEBUG 3369 struct scsi_device *scsidev = cmd->device; 3370 u8 *scsicmd = cmd->cmnd; 3371 3372 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 3373 ap->print_id, 3374 scsidev->channel, scsidev->id, scsidev->lun, 3375 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 3376 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 3377 scsicmd[8]); 3378 #endif 3379 } 3380 3381 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 3382 struct ata_device *dev) 3383 { 3384 u8 scsi_op = scmd->cmnd[0]; 3385 ata_xlat_func_t xlat_func; 3386 int rc = 0; 3387 3388 if (dev->class == ATA_DEV_ATA) { 3389 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) 3390 goto bad_cdb_len; 3391 3392 xlat_func = ata_get_xlat_func(dev, scsi_op); 3393 } else { 3394 if (unlikely(!scmd->cmd_len)) 3395 goto bad_cdb_len; 3396 3397 xlat_func = NULL; 3398 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) { 3399 /* relay SCSI command to ATAPI device */ 3400 int len = COMMAND_SIZE(scsi_op); 3401 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len)) 3402 goto bad_cdb_len; 3403 3404 xlat_func = atapi_xlat; 3405 } else { 3406 /* ATA_16 passthru, treat as an ATA command */ 3407 if (unlikely(scmd->cmd_len > 16)) 3408 goto bad_cdb_len; 3409 3410 xlat_func = ata_get_xlat_func(dev, scsi_op); 3411 } 3412 } 3413 3414 if (xlat_func) 3415 rc = ata_scsi_translate(dev, scmd, xlat_func); 3416 else 3417 ata_scsi_simulate(dev, scmd); 3418 3419 return rc; 3420 3421 bad_cdb_len: 3422 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n", 3423 scmd->cmd_len, scsi_op, dev->cdb_len); 3424 scmd->result = DID_ERROR << 16; 3425 scmd->scsi_done(scmd); 3426 return 0; 3427 } 3428 3429 /** 3430 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 3431 * @shost: SCSI host of command to be sent 3432 * @cmd: SCSI command to be sent 3433 * 3434 * In some cases, this function translates SCSI commands into 3435 * ATA taskfiles, and queues the taskfiles to be sent to 3436 * hardware. In other cases, this function simulates a 3437 * SCSI device by evaluating and responding to certain 3438 * SCSI commands. This creates the overall effect of 3439 * ATA and ATAPI devices appearing as SCSI devices. 3440 * 3441 * LOCKING: 3442 * ATA host lock 3443 * 3444 * RETURNS: 3445 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3446 * 0 otherwise. 3447 */ 3448 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) 3449 { 3450 struct ata_port *ap; 3451 struct ata_device *dev; 3452 struct scsi_device *scsidev = cmd->device; 3453 int rc = 0; 3454 unsigned long irq_flags; 3455 3456 ap = ata_shost_to_port(shost); 3457 3458 spin_lock_irqsave(ap->lock, irq_flags); 3459 3460 ata_scsi_dump_cdb(ap, cmd); 3461 3462 dev = ata_scsi_find_dev(ap, scsidev); 3463 if (likely(dev)) 3464 rc = __ata_scsi_queuecmd(cmd, dev); 3465 else { 3466 cmd->result = (DID_BAD_TARGET << 16); 3467 cmd->scsi_done(cmd); 3468 } 3469 3470 spin_unlock_irqrestore(ap->lock, irq_flags); 3471 3472 return rc; 3473 } 3474 3475 /** 3476 * ata_scsi_simulate - simulate SCSI command on ATA device 3477 * @dev: the target device 3478 * @cmd: SCSI command being sent to device. 3479 * 3480 * Interprets and directly executes a select list of SCSI commands 3481 * that can be handled internally. 3482 * 3483 * LOCKING: 3484 * spin_lock_irqsave(host lock) 3485 */ 3486 3487 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 3488 { 3489 struct ata_scsi_args args; 3490 const u8 *scsicmd = cmd->cmnd; 3491 u8 tmp8; 3492 3493 args.dev = dev; 3494 args.id = dev->id; 3495 args.cmd = cmd; 3496 args.done = cmd->scsi_done; 3497 3498 switch(scsicmd[0]) { 3499 /* TODO: worth improving? */ 3500 case FORMAT_UNIT: 3501 ata_scsi_invalid_field(cmd); 3502 break; 3503 3504 case INQUIRY: 3505 if (scsicmd[1] & 2) /* is CmdDt set? */ 3506 ata_scsi_invalid_field(cmd); 3507 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 3508 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 3509 else switch (scsicmd[2]) { 3510 case 0x00: 3511 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 3512 break; 3513 case 0x80: 3514 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 3515 break; 3516 case 0x83: 3517 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 3518 break; 3519 case 0x89: 3520 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89); 3521 break; 3522 case 0xb0: 3523 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0); 3524 break; 3525 case 0xb1: 3526 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1); 3527 break; 3528 case 0xb2: 3529 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2); 3530 break; 3531 default: 3532 ata_scsi_invalid_field(cmd); 3533 break; 3534 } 3535 break; 3536 3537 case MODE_SENSE: 3538 case MODE_SENSE_10: 3539 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 3540 break; 3541 3542 case READ_CAPACITY: 3543 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3544 break; 3545 3546 case SERVICE_ACTION_IN: 3547 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 3548 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 3549 else 3550 ata_scsi_invalid_field(cmd); 3551 break; 3552 3553 case REPORT_LUNS: 3554 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 3555 break; 3556 3557 case REQUEST_SENSE: 3558 ata_scsi_set_sense(cmd, 0, 0, 0); 3559 cmd->result = (DRIVER_SENSE << 24); 3560 cmd->scsi_done(cmd); 3561 break; 3562 3563 /* if we reach this, then writeback caching is disabled, 3564 * turning this into a no-op. 3565 */ 3566 case SYNCHRONIZE_CACHE: 3567 /* fall through */ 3568 3569 /* no-op's, complete with success */ 3570 case REZERO_UNIT: 3571 case SEEK_6: 3572 case SEEK_10: 3573 case TEST_UNIT_READY: 3574 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3575 break; 3576 3577 case SEND_DIAGNOSTIC: 3578 tmp8 = scsicmd[1] & ~(1 << 3); 3579 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4])) 3580 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 3581 else 3582 ata_scsi_invalid_field(cmd); 3583 break; 3584 3585 /* all other commands */ 3586 default: 3587 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 3588 /* "Invalid command operation code" */ 3589 cmd->scsi_done(cmd); 3590 break; 3591 } 3592 } 3593 3594 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 3595 { 3596 int i, rc; 3597 3598 for (i = 0; i < host->n_ports; i++) { 3599 struct ata_port *ap = host->ports[i]; 3600 struct Scsi_Host *shost; 3601 3602 rc = -ENOMEM; 3603 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 3604 if (!shost) 3605 goto err_alloc; 3606 3607 shost->eh_noresume = 1; 3608 *(struct ata_port **)&shost->hostdata[0] = ap; 3609 ap->scsi_host = shost; 3610 3611 shost->transportt = ata_scsi_transport_template; 3612 shost->unique_id = ap->print_id; 3613 shost->max_id = 16; 3614 shost->max_lun = 1; 3615 shost->max_channel = 1; 3616 shost->max_cmd_len = 16; 3617 3618 /* Schedule policy is determined by ->qc_defer() 3619 * callback and it needs to see every deferred qc. 3620 * Set host_blocked to 1 to prevent SCSI midlayer from 3621 * automatically deferring requests. 3622 */ 3623 shost->max_host_blocked = 1; 3624 3625 rc = scsi_add_host_with_dma(ap->scsi_host, 3626 &ap->tdev, ap->host->dev); 3627 if (rc) 3628 goto err_add; 3629 } 3630 3631 return 0; 3632 3633 err_add: 3634 scsi_host_put(host->ports[i]->scsi_host); 3635 err_alloc: 3636 while (--i >= 0) { 3637 struct Scsi_Host *shost = host->ports[i]->scsi_host; 3638 3639 scsi_remove_host(shost); 3640 scsi_host_put(shost); 3641 } 3642 return rc; 3643 } 3644 3645 void ata_scsi_scan_host(struct ata_port *ap, int sync) 3646 { 3647 int tries = 5; 3648 struct ata_device *last_failed_dev = NULL; 3649 struct ata_link *link; 3650 struct ata_device *dev; 3651 3652 repeat: 3653 ata_for_each_link(link, ap, EDGE) { 3654 ata_for_each_dev(dev, link, ENABLED) { 3655 struct scsi_device *sdev; 3656 int channel = 0, id = 0; 3657 3658 if (dev->sdev) 3659 continue; 3660 3661 if (ata_is_host_link(link)) 3662 id = dev->devno; 3663 else 3664 channel = link->pmp; 3665 3666 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, 3667 NULL); 3668 if (!IS_ERR(sdev)) { 3669 dev->sdev = sdev; 3670 scsi_device_put(sdev); 3671 if (zpodd_dev_enabled(dev)) 3672 dev_pm_qos_expose_flags( 3673 &sdev->sdev_gendev, 0); 3674 } else { 3675 dev->sdev = NULL; 3676 } 3677 } 3678 } 3679 3680 /* If we scanned while EH was in progress or allocation 3681 * failure occurred, scan would have failed silently. Check 3682 * whether all devices are attached. 3683 */ 3684 ata_for_each_link(link, ap, EDGE) { 3685 ata_for_each_dev(dev, link, ENABLED) { 3686 if (!dev->sdev) 3687 goto exit_loop; 3688 } 3689 } 3690 exit_loop: 3691 if (!link) 3692 return; 3693 3694 /* we're missing some SCSI devices */ 3695 if (sync) { 3696 /* If caller requested synchrnous scan && we've made 3697 * any progress, sleep briefly and repeat. 3698 */ 3699 if (dev != last_failed_dev) { 3700 msleep(100); 3701 last_failed_dev = dev; 3702 goto repeat; 3703 } 3704 3705 /* We might be failing to detect boot device, give it 3706 * a few more chances. 3707 */ 3708 if (--tries) { 3709 msleep(100); 3710 goto repeat; 3711 } 3712 3713 ata_port_err(ap, 3714 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); 3715 } 3716 3717 queue_delayed_work(system_long_wq, &ap->hotplug_task, 3718 round_jiffies_relative(HZ)); 3719 } 3720 3721 /** 3722 * ata_scsi_offline_dev - offline attached SCSI device 3723 * @dev: ATA device to offline attached SCSI device for 3724 * 3725 * This function is called from ata_eh_hotplug() and responsible 3726 * for taking the SCSI device attached to @dev offline. This 3727 * function is called with host lock which protects dev->sdev 3728 * against clearing. 3729 * 3730 * LOCKING: 3731 * spin_lock_irqsave(host lock) 3732 * 3733 * RETURNS: 3734 * 1 if attached SCSI device exists, 0 otherwise. 3735 */ 3736 int ata_scsi_offline_dev(struct ata_device *dev) 3737 { 3738 if (dev->sdev) { 3739 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 3740 return 1; 3741 } 3742 return 0; 3743 } 3744 3745 /** 3746 * ata_scsi_remove_dev - remove attached SCSI device 3747 * @dev: ATA device to remove attached SCSI device for 3748 * 3749 * This function is called from ata_eh_scsi_hotplug() and 3750 * responsible for removing the SCSI device attached to @dev. 3751 * 3752 * LOCKING: 3753 * Kernel thread context (may sleep). 3754 */ 3755 static void ata_scsi_remove_dev(struct ata_device *dev) 3756 { 3757 struct ata_port *ap = dev->link->ap; 3758 struct scsi_device *sdev; 3759 unsigned long flags; 3760 3761 /* Alas, we need to grab scan_mutex to ensure SCSI device 3762 * state doesn't change underneath us and thus 3763 * scsi_device_get() always succeeds. The mutex locking can 3764 * be removed if there is __scsi_device_get() interface which 3765 * increments reference counts regardless of device state. 3766 */ 3767 mutex_lock(&ap->scsi_host->scan_mutex); 3768 spin_lock_irqsave(ap->lock, flags); 3769 3770 if (zpodd_dev_enabled(dev)) 3771 zpodd_exit(dev); 3772 3773 /* clearing dev->sdev is protected by host lock */ 3774 sdev = dev->sdev; 3775 dev->sdev = NULL; 3776 3777 if (sdev) { 3778 /* If user initiated unplug races with us, sdev can go 3779 * away underneath us after the host lock and 3780 * scan_mutex are released. Hold onto it. 3781 */ 3782 if (scsi_device_get(sdev) == 0) { 3783 /* The following ensures the attached sdev is 3784 * offline on return from ata_scsi_offline_dev() 3785 * regardless it wins or loses the race 3786 * against this function. 3787 */ 3788 scsi_device_set_state(sdev, SDEV_OFFLINE); 3789 } else { 3790 WARN_ON(1); 3791 sdev = NULL; 3792 } 3793 } 3794 3795 spin_unlock_irqrestore(ap->lock, flags); 3796 mutex_unlock(&ap->scsi_host->scan_mutex); 3797 3798 if (sdev) { 3799 ata_dev_info(dev, "detaching (SCSI %s)\n", 3800 dev_name(&sdev->sdev_gendev)); 3801 3802 scsi_remove_device(sdev); 3803 scsi_device_put(sdev); 3804 } 3805 } 3806 3807 static void ata_scsi_handle_link_detach(struct ata_link *link) 3808 { 3809 struct ata_port *ap = link->ap; 3810 struct ata_device *dev; 3811 3812 ata_for_each_dev(dev, link, ALL) { 3813 unsigned long flags; 3814 3815 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3816 continue; 3817 3818 spin_lock_irqsave(ap->lock, flags); 3819 dev->flags &= ~ATA_DFLAG_DETACHED; 3820 spin_unlock_irqrestore(ap->lock, flags); 3821 3822 ata_scsi_remove_dev(dev); 3823 } 3824 } 3825 3826 /** 3827 * ata_scsi_media_change_notify - send media change event 3828 * @dev: Pointer to the disk device with media change event 3829 * 3830 * Tell the block layer to send a media change notification 3831 * event. 3832 * 3833 * LOCKING: 3834 * spin_lock_irqsave(host lock) 3835 */ 3836 void ata_scsi_media_change_notify(struct ata_device *dev) 3837 { 3838 if (dev->sdev) 3839 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, 3840 GFP_ATOMIC); 3841 } 3842 3843 /** 3844 * ata_scsi_hotplug - SCSI part of hotplug 3845 * @work: Pointer to ATA port to perform SCSI hotplug on 3846 * 3847 * Perform SCSI part of hotplug. It's executed from a separate 3848 * workqueue after EH completes. This is necessary because SCSI 3849 * hot plugging requires working EH and hot unplugging is 3850 * synchronized with hot plugging with a mutex. 3851 * 3852 * LOCKING: 3853 * Kernel thread context (may sleep). 3854 */ 3855 void ata_scsi_hotplug(struct work_struct *work) 3856 { 3857 struct ata_port *ap = 3858 container_of(work, struct ata_port, hotplug_task.work); 3859 int i; 3860 3861 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3862 DPRINTK("ENTER/EXIT - unloading\n"); 3863 return; 3864 } 3865 3866 DPRINTK("ENTER\n"); 3867 mutex_lock(&ap->scsi_scan_mutex); 3868 3869 /* Unplug detached devices. We cannot use link iterator here 3870 * because PMP links have to be scanned even if PMP is 3871 * currently not attached. Iterate manually. 3872 */ 3873 ata_scsi_handle_link_detach(&ap->link); 3874 if (ap->pmp_link) 3875 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 3876 ata_scsi_handle_link_detach(&ap->pmp_link[i]); 3877 3878 /* scan for new ones */ 3879 ata_scsi_scan_host(ap, 0); 3880 3881 mutex_unlock(&ap->scsi_scan_mutex); 3882 DPRINTK("EXIT\n"); 3883 } 3884 3885 /** 3886 * ata_scsi_user_scan - indication for user-initiated bus scan 3887 * @shost: SCSI host to scan 3888 * @channel: Channel to scan 3889 * @id: ID to scan 3890 * @lun: LUN to scan 3891 * 3892 * This function is called when user explicitly requests bus 3893 * scan. Set probe pending flag and invoke EH. 3894 * 3895 * LOCKING: 3896 * SCSI layer (we don't care) 3897 * 3898 * RETURNS: 3899 * Zero. 3900 */ 3901 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3902 unsigned int id, unsigned int lun) 3903 { 3904 struct ata_port *ap = ata_shost_to_port(shost); 3905 unsigned long flags; 3906 int devno, rc = 0; 3907 3908 if (!ap->ops->error_handler) 3909 return -EOPNOTSUPP; 3910 3911 if (lun != SCAN_WILD_CARD && lun) 3912 return -EINVAL; 3913 3914 if (!sata_pmp_attached(ap)) { 3915 if (channel != SCAN_WILD_CARD && channel) 3916 return -EINVAL; 3917 devno = id; 3918 } else { 3919 if (id != SCAN_WILD_CARD && id) 3920 return -EINVAL; 3921 devno = channel; 3922 } 3923 3924 spin_lock_irqsave(ap->lock, flags); 3925 3926 if (devno == SCAN_WILD_CARD) { 3927 struct ata_link *link; 3928 3929 ata_for_each_link(link, ap, EDGE) { 3930 struct ata_eh_info *ehi = &link->eh_info; 3931 ehi->probe_mask |= ATA_ALL_DEVICES; 3932 ehi->action |= ATA_EH_RESET; 3933 } 3934 } else { 3935 struct ata_device *dev = ata_find_dev(ap, devno); 3936 3937 if (dev) { 3938 struct ata_eh_info *ehi = &dev->link->eh_info; 3939 ehi->probe_mask |= 1 << dev->devno; 3940 ehi->action |= ATA_EH_RESET; 3941 } else 3942 rc = -EINVAL; 3943 } 3944 3945 if (rc == 0) { 3946 ata_port_schedule_eh(ap); 3947 spin_unlock_irqrestore(ap->lock, flags); 3948 ata_port_wait_eh(ap); 3949 } else 3950 spin_unlock_irqrestore(ap->lock, flags); 3951 3952 return rc; 3953 } 3954 3955 /** 3956 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3957 * @work: Pointer to ATA port to perform scsi_rescan_device() 3958 * 3959 * After ATA pass thru (SAT) commands are executed successfully, 3960 * libata need to propagate the changes to SCSI layer. 3961 * 3962 * LOCKING: 3963 * Kernel thread context (may sleep). 3964 */ 3965 void ata_scsi_dev_rescan(struct work_struct *work) 3966 { 3967 struct ata_port *ap = 3968 container_of(work, struct ata_port, scsi_rescan_task); 3969 struct ata_link *link; 3970 struct ata_device *dev; 3971 unsigned long flags; 3972 3973 mutex_lock(&ap->scsi_scan_mutex); 3974 spin_lock_irqsave(ap->lock, flags); 3975 3976 ata_for_each_link(link, ap, EDGE) { 3977 ata_for_each_dev(dev, link, ENABLED) { 3978 struct scsi_device *sdev = dev->sdev; 3979 3980 if (!sdev) 3981 continue; 3982 if (scsi_device_get(sdev)) 3983 continue; 3984 3985 spin_unlock_irqrestore(ap->lock, flags); 3986 scsi_rescan_device(&(sdev->sdev_gendev)); 3987 scsi_device_put(sdev); 3988 spin_lock_irqsave(ap->lock, flags); 3989 } 3990 } 3991 3992 spin_unlock_irqrestore(ap->lock, flags); 3993 mutex_unlock(&ap->scsi_scan_mutex); 3994 } 3995 3996 /** 3997 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3998 * @host: ATA host container for all SAS ports 3999 * @port_info: Information from low-level host driver 4000 * @shost: SCSI host that the scsi device is attached to 4001 * 4002 * LOCKING: 4003 * PCI/etc. bus probe sem. 4004 * 4005 * RETURNS: 4006 * ata_port pointer on success / NULL on failure. 4007 */ 4008 4009 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 4010 struct ata_port_info *port_info, 4011 struct Scsi_Host *shost) 4012 { 4013 struct ata_port *ap; 4014 4015 ap = ata_port_alloc(host); 4016 if (!ap) 4017 return NULL; 4018 4019 ap->port_no = 0; 4020 ap->lock = &host->lock; 4021 ap->pio_mask = port_info->pio_mask; 4022 ap->mwdma_mask = port_info->mwdma_mask; 4023 ap->udma_mask = port_info->udma_mask; 4024 ap->flags |= port_info->flags; 4025 ap->ops = port_info->port_ops; 4026 ap->cbl = ATA_CBL_SATA; 4027 4028 return ap; 4029 } 4030 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 4031 4032 /** 4033 * ata_sas_port_start - Set port up for dma. 4034 * @ap: Port to initialize 4035 * 4036 * Called just after data structures for each port are 4037 * initialized. 4038 * 4039 * May be used as the port_start() entry in ata_port_operations. 4040 * 4041 * LOCKING: 4042 * Inherited from caller. 4043 */ 4044 int ata_sas_port_start(struct ata_port *ap) 4045 { 4046 /* 4047 * the port is marked as frozen at allocation time, but if we don't 4048 * have new eh, we won't thaw it 4049 */ 4050 if (!ap->ops->error_handler) 4051 ap->pflags &= ~ATA_PFLAG_FROZEN; 4052 return 0; 4053 } 4054 EXPORT_SYMBOL_GPL(ata_sas_port_start); 4055 4056 /** 4057 * ata_port_stop - Undo ata_sas_port_start() 4058 * @ap: Port to shut down 4059 * 4060 * May be used as the port_stop() entry in ata_port_operations. 4061 * 4062 * LOCKING: 4063 * Inherited from caller. 4064 */ 4065 4066 void ata_sas_port_stop(struct ata_port *ap) 4067 { 4068 } 4069 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 4070 4071 /** 4072 * ata_sas_async_probe - simply schedule probing and return 4073 * @ap: Port to probe 4074 * 4075 * For batch scheduling of probe for sas attached ata devices, assumes 4076 * the port has already been through ata_sas_port_init() 4077 */ 4078 void ata_sas_async_probe(struct ata_port *ap) 4079 { 4080 __ata_port_probe(ap); 4081 } 4082 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 4083 4084 int ata_sas_sync_probe(struct ata_port *ap) 4085 { 4086 return ata_port_probe(ap); 4087 } 4088 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 4089 4090 4091 /** 4092 * ata_sas_port_init - Initialize a SATA device 4093 * @ap: SATA port to initialize 4094 * 4095 * LOCKING: 4096 * PCI/etc. bus probe sem. 4097 * 4098 * RETURNS: 4099 * Zero on success, non-zero on error. 4100 */ 4101 4102 int ata_sas_port_init(struct ata_port *ap) 4103 { 4104 int rc = ap->ops->port_start(ap); 4105 4106 if (rc) 4107 return rc; 4108 ap->print_id = atomic_inc_return(&ata_print_id); 4109 return 0; 4110 } 4111 EXPORT_SYMBOL_GPL(ata_sas_port_init); 4112 4113 /** 4114 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 4115 * @ap: SATA port to destroy 4116 * 4117 */ 4118 4119 void ata_sas_port_destroy(struct ata_port *ap) 4120 { 4121 if (ap->ops->port_stop) 4122 ap->ops->port_stop(ap); 4123 kfree(ap); 4124 } 4125 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 4126 4127 /** 4128 * ata_sas_slave_configure - Default slave_config routine for libata devices 4129 * @sdev: SCSI device to configure 4130 * @ap: ATA port to which SCSI device is attached 4131 * 4132 * RETURNS: 4133 * Zero. 4134 */ 4135 4136 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 4137 { 4138 ata_scsi_sdev_config(sdev); 4139 ata_scsi_dev_config(sdev, ap->link.device); 4140 return 0; 4141 } 4142 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 4143 4144 /** 4145 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 4146 * @cmd: SCSI command to be sent 4147 * @ap: ATA port to which the command is being sent 4148 * 4149 * RETURNS: 4150 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 4151 * 0 otherwise. 4152 */ 4153 4154 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 4155 { 4156 int rc = 0; 4157 4158 ata_scsi_dump_cdb(ap, cmd); 4159 4160 if (likely(ata_dev_enabled(ap->link.device))) 4161 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 4162 else { 4163 cmd->result = (DID_BAD_TARGET << 16); 4164 cmd->scsi_done(cmd); 4165 } 4166 return rc; 4167 } 4168 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 4169