1 /* 2 * libata-scsi.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from 31 * - http://www.t10.org/ 32 * - http://www.t13.org/ 33 * 34 */ 35 36 #include <linux/kernel.h> 37 #include <linux/blkdev.h> 38 #include <linux/spinlock.h> 39 #include <scsi/scsi.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_cmnd.h> 42 #include <scsi/scsi_eh.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_tcq.h> 45 #include <scsi/scsi_transport.h> 46 #include <linux/libata.h> 47 #include <linux/hdreg.h> 48 #include <asm/uaccess.h> 49 50 #include "libata.h" 51 52 #define SECTOR_SIZE 512 53 54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); 55 56 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap, 57 const struct scsi_device *scsidev); 58 static struct ata_device * ata_scsi_find_dev(struct ata_port *ap, 59 const struct scsi_device *scsidev); 60 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 61 unsigned int id, unsigned int lun); 62 63 64 #define RW_RECOVERY_MPAGE 0x1 65 #define RW_RECOVERY_MPAGE_LEN 12 66 #define CACHE_MPAGE 0x8 67 #define CACHE_MPAGE_LEN 20 68 #define CONTROL_MPAGE 0xa 69 #define CONTROL_MPAGE_LEN 12 70 #define ALL_MPAGES 0x3f 71 #define ALL_SUB_MPAGES 0xff 72 73 74 static const u8 def_rw_recovery_mpage[] = { 75 RW_RECOVERY_MPAGE, 76 RW_RECOVERY_MPAGE_LEN - 2, 77 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */ 78 (1 << 6), /* ARRE (auto read reallocation) */ 79 0, /* read retry count */ 80 0, 0, 0, 0, 81 0, /* write retry count */ 82 0, 0, 0 83 }; 84 85 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { 86 CACHE_MPAGE, 87 CACHE_MPAGE_LEN - 2, 88 0, /* contains WCE, needs to be 0 for logic */ 89 0, 0, 0, 0, 0, 0, 0, 0, 0, 90 0, /* contains DRA, needs to be 0 for logic */ 91 0, 0, 0, 0, 0, 0, 0 92 }; 93 94 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { 95 CONTROL_MPAGE, 96 CONTROL_MPAGE_LEN - 2, 97 2, /* DSENSE=0, GLTSD=1 */ 98 0, /* [QAM+QERR may be 1, see 05-359r1] */ 99 0, 0, 0, 0, 0xff, 0xff, 100 0, 30 /* extended self test time, see 05-359r1 */ 101 }; 102 103 /* 104 * libata transport template. libata doesn't do real transport stuff. 105 * It just needs the eh_timed_out hook. 106 */ 107 struct scsi_transport_template ata_scsi_transport_template = { 108 .eh_strategy_handler = ata_scsi_error, 109 .eh_timed_out = ata_scsi_timed_out, 110 .user_scan = ata_scsi_user_scan, 111 }; 112 113 114 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd, 115 void (*done)(struct scsi_cmnd *)) 116 { 117 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0); 118 /* "Invalid field in cbd" */ 119 done(cmd); 120 } 121 122 /** 123 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. 124 * @sdev: SCSI device for which BIOS geometry is to be determined 125 * @bdev: block device associated with @sdev 126 * @capacity: capacity of SCSI device 127 * @geom: location to which geometry will be output 128 * 129 * Generic bios head/sector/cylinder calculator 130 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) 131 * mapping. Some situations may arise where the disk is not 132 * bootable if this is not used. 133 * 134 * LOCKING: 135 * Defined by the SCSI layer. We don't really care. 136 * 137 * RETURNS: 138 * Zero. 139 */ 140 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, 141 sector_t capacity, int geom[]) 142 { 143 geom[0] = 255; 144 geom[1] = 63; 145 sector_div(capacity, 255*63); 146 geom[2] = capacity; 147 148 return 0; 149 } 150 151 /** 152 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl 153 * @sdev: SCSI device to get identify data for 154 * @arg: User buffer area for identify data 155 * 156 * LOCKING: 157 * Defined by the SCSI layer. We don't really care. 158 * 159 * RETURNS: 160 * Zero on success, negative errno on error. 161 */ 162 static int ata_get_identity(struct scsi_device *sdev, void __user *arg) 163 { 164 struct ata_port *ap = ata_shost_to_port(sdev->host); 165 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 166 u16 __user *dst = arg; 167 char buf[40]; 168 169 if (!dev) 170 return -ENOMSG; 171 172 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) 173 return -EFAULT; 174 175 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); 176 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) 177 return -EFAULT; 178 179 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); 180 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) 181 return -EFAULT; 182 183 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); 184 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) 185 return -EFAULT; 186 187 return 0; 188 } 189 190 /** 191 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl 192 * @scsidev: Device to which we are issuing command 193 * @arg: User provided data for issuing command 194 * 195 * LOCKING: 196 * Defined by the SCSI layer. We don't really care. 197 * 198 * RETURNS: 199 * Zero on success, negative errno on error. 200 */ 201 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) 202 { 203 int rc = 0; 204 u8 scsi_cmd[MAX_COMMAND_SIZE]; 205 u8 args[4], *argbuf = NULL, *sensebuf = NULL; 206 int argsize = 0; 207 enum dma_data_direction data_dir; 208 int cmd_result; 209 210 if (arg == NULL) 211 return -EINVAL; 212 213 if (copy_from_user(args, arg, sizeof(args))) 214 return -EFAULT; 215 216 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 217 if (!sensebuf) 218 return -ENOMEM; 219 220 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 221 222 if (args[3]) { 223 argsize = SECTOR_SIZE * args[3]; 224 argbuf = kmalloc(argsize, GFP_KERNEL); 225 if (argbuf == NULL) { 226 rc = -ENOMEM; 227 goto error; 228 } 229 230 scsi_cmd[1] = (4 << 1); /* PIO Data-in */ 231 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, 232 block count in sector count field */ 233 data_dir = DMA_FROM_DEVICE; 234 } else { 235 scsi_cmd[1] = (3 << 1); /* Non-data */ 236 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 237 data_dir = DMA_NONE; 238 } 239 240 scsi_cmd[0] = ATA_16; 241 242 scsi_cmd[4] = args[2]; 243 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */ 244 scsi_cmd[6] = args[3]; 245 scsi_cmd[8] = args[1]; 246 scsi_cmd[10] = 0x4f; 247 scsi_cmd[12] = 0xc2; 248 } else { 249 scsi_cmd[6] = args[1]; 250 } 251 scsi_cmd[14] = args[0]; 252 253 /* Good values for timeout and retries? Values below 254 from scsi_ioctl_send_command() for default case... */ 255 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, 256 sensebuf, (10*HZ), 5, 0); 257 258 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 259 u8 *desc = sensebuf + 8; 260 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 261 262 /* If we set cc then ATA pass-through will cause a 263 * check condition even if no error. Filter that. */ 264 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 265 struct scsi_sense_hdr sshdr; 266 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 267 &sshdr); 268 if (sshdr.sense_key==0 && 269 sshdr.asc==0 && sshdr.ascq==0) 270 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 271 } 272 273 /* Send userspace a few ATA registers (same as drivers/ide) */ 274 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 275 desc[0] == 0x09 ) { /* code is "ATA Descriptor" */ 276 args[0] = desc[13]; /* status */ 277 args[1] = desc[3]; /* error */ 278 args[2] = desc[5]; /* sector count (0:7) */ 279 if (copy_to_user(arg, args, sizeof(args))) 280 rc = -EFAULT; 281 } 282 } 283 284 285 if (cmd_result) { 286 rc = -EIO; 287 goto error; 288 } 289 290 if ((argbuf) 291 && copy_to_user(arg + sizeof(args), argbuf, argsize)) 292 rc = -EFAULT; 293 error: 294 kfree(sensebuf); 295 kfree(argbuf); 296 return rc; 297 } 298 299 /** 300 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl 301 * @scsidev: Device to which we are issuing command 302 * @arg: User provided data for issuing command 303 * 304 * LOCKING: 305 * Defined by the SCSI layer. We don't really care. 306 * 307 * RETURNS: 308 * Zero on success, negative errno on error. 309 */ 310 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) 311 { 312 int rc = 0; 313 u8 scsi_cmd[MAX_COMMAND_SIZE]; 314 u8 args[7], *sensebuf = NULL; 315 int cmd_result; 316 317 if (arg == NULL) 318 return -EINVAL; 319 320 if (copy_from_user(args, arg, sizeof(args))) 321 return -EFAULT; 322 323 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO); 324 if (!sensebuf) 325 return -ENOMEM; 326 327 memset(scsi_cmd, 0, sizeof(scsi_cmd)); 328 scsi_cmd[0] = ATA_16; 329 scsi_cmd[1] = (3 << 1); /* Non-data */ 330 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ 331 scsi_cmd[4] = args[1]; 332 scsi_cmd[6] = args[2]; 333 scsi_cmd[8] = args[3]; 334 scsi_cmd[10] = args[4]; 335 scsi_cmd[12] = args[5]; 336 scsi_cmd[13] = args[6] & 0x0f; 337 scsi_cmd[14] = args[0]; 338 339 /* Good values for timeout and retries? Values below 340 from scsi_ioctl_send_command() for default case... */ 341 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, 342 sensebuf, (10*HZ), 5, 0); 343 344 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */ 345 u8 *desc = sensebuf + 8; 346 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ 347 348 /* If we set cc then ATA pass-through will cause a 349 * check condition even if no error. Filter that. */ 350 if (cmd_result & SAM_STAT_CHECK_CONDITION) { 351 struct scsi_sense_hdr sshdr; 352 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, 353 &sshdr); 354 if (sshdr.sense_key==0 && 355 sshdr.asc==0 && sshdr.ascq==0) 356 cmd_result &= ~SAM_STAT_CHECK_CONDITION; 357 } 358 359 /* Send userspace ATA registers */ 360 if (sensebuf[0] == 0x72 && /* format is "descriptor" */ 361 desc[0] == 0x09) {/* code is "ATA Descriptor" */ 362 args[0] = desc[13]; /* status */ 363 args[1] = desc[3]; /* error */ 364 args[2] = desc[5]; /* sector count (0:7) */ 365 args[3] = desc[7]; /* lbal */ 366 args[4] = desc[9]; /* lbam */ 367 args[5] = desc[11]; /* lbah */ 368 args[6] = desc[12]; /* select */ 369 if (copy_to_user(arg, args, sizeof(args))) 370 rc = -EFAULT; 371 } 372 } 373 374 if (cmd_result) { 375 rc = -EIO; 376 goto error; 377 } 378 379 error: 380 kfree(sensebuf); 381 return rc; 382 } 383 384 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) 385 { 386 int val = -EINVAL, rc = -EINVAL; 387 388 switch (cmd) { 389 case ATA_IOC_GET_IO32: 390 val = 0; 391 if (copy_to_user(arg, &val, 1)) 392 return -EFAULT; 393 return 0; 394 395 case ATA_IOC_SET_IO32: 396 val = (unsigned long) arg; 397 if (val != 0) 398 return -EINVAL; 399 return 0; 400 401 case HDIO_GET_IDENTITY: 402 return ata_get_identity(scsidev, arg); 403 404 case HDIO_DRIVE_CMD: 405 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 406 return -EACCES; 407 return ata_cmd_ioctl(scsidev, arg); 408 409 case HDIO_DRIVE_TASK: 410 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 411 return -EACCES; 412 return ata_task_ioctl(scsidev, arg); 413 414 default: 415 rc = -ENOTTY; 416 break; 417 } 418 419 return rc; 420 } 421 422 /** 423 * ata_scsi_qc_new - acquire new ata_queued_cmd reference 424 * @dev: ATA device to which the new command is attached 425 * @cmd: SCSI command that originated this ATA command 426 * @done: SCSI command completion function 427 * 428 * Obtain a reference to an unused ata_queued_cmd structure, 429 * which is the basic libata structure representing a single 430 * ATA command sent to the hardware. 431 * 432 * If a command was available, fill in the SCSI-specific 433 * portions of the structure with information on the 434 * current command. 435 * 436 * LOCKING: 437 * spin_lock_irqsave(host lock) 438 * 439 * RETURNS: 440 * Command allocated, or %NULL if none available. 441 */ 442 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, 443 struct scsi_cmnd *cmd, 444 void (*done)(struct scsi_cmnd *)) 445 { 446 struct ata_queued_cmd *qc; 447 448 qc = ata_qc_new_init(dev); 449 if (qc) { 450 qc->scsicmd = cmd; 451 qc->scsidone = done; 452 453 if (cmd->use_sg) { 454 qc->__sg = (struct scatterlist *) cmd->request_buffer; 455 qc->n_elem = cmd->use_sg; 456 } else if (cmd->request_bufflen) { 457 qc->__sg = &qc->sgent; 458 qc->n_elem = 1; 459 } 460 } else { 461 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); 462 done(cmd); 463 } 464 465 return qc; 466 } 467 468 /** 469 * ata_dump_status - user friendly display of error info 470 * @id: id of the port in question 471 * @tf: ptr to filled out taskfile 472 * 473 * Decode and dump the ATA error/status registers for the user so 474 * that they have some idea what really happened at the non 475 * make-believe layer. 476 * 477 * LOCKING: 478 * inherited from caller 479 */ 480 static void ata_dump_status(unsigned id, struct ata_taskfile *tf) 481 { 482 u8 stat = tf->command, err = tf->feature; 483 484 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat); 485 if (stat & ATA_BUSY) { 486 printk("Busy }\n"); /* Data is not valid in this case */ 487 } else { 488 if (stat & 0x40) printk("DriveReady "); 489 if (stat & 0x20) printk("DeviceFault "); 490 if (stat & 0x10) printk("SeekComplete "); 491 if (stat & 0x08) printk("DataRequest "); 492 if (stat & 0x04) printk("CorrectedError "); 493 if (stat & 0x02) printk("Index "); 494 if (stat & 0x01) printk("Error "); 495 printk("}\n"); 496 497 if (err) { 498 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err); 499 if (err & 0x04) printk("DriveStatusError "); 500 if (err & 0x80) { 501 if (err & 0x04) printk("BadCRC "); 502 else printk("Sector "); 503 } 504 if (err & 0x40) printk("UncorrectableError "); 505 if (err & 0x10) printk("SectorIdNotFound "); 506 if (err & 0x02) printk("TrackZeroNotFound "); 507 if (err & 0x01) printk("AddrMarkNotFound "); 508 printk("}\n"); 509 } 510 } 511 } 512 513 #ifdef CONFIG_PM 514 /** 515 * ata_scsi_device_suspend - suspend ATA device associated with sdev 516 * @sdev: the SCSI device to suspend 517 * @mesg: target power management message 518 * 519 * Request suspend EH action on the ATA device associated with 520 * @sdev and wait for the operation to complete. 521 * 522 * LOCKING: 523 * Kernel thread context (may sleep). 524 * 525 * RETURNS: 526 * 0 on success, -errno otherwise. 527 */ 528 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg) 529 { 530 struct ata_port *ap = ata_shost_to_port(sdev->host); 531 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 532 unsigned long flags; 533 unsigned int action; 534 int rc = 0; 535 536 if (!dev) 537 goto out; 538 539 spin_lock_irqsave(ap->lock, flags); 540 541 /* wait for the previous resume to complete */ 542 while (dev->flags & ATA_DFLAG_SUSPENDED) { 543 spin_unlock_irqrestore(ap->lock, flags); 544 ata_port_wait_eh(ap); 545 spin_lock_irqsave(ap->lock, flags); 546 } 547 548 /* if @sdev is already detached, nothing to do */ 549 if (sdev->sdev_state == SDEV_OFFLINE || 550 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL) 551 goto out_unlock; 552 553 /* request suspend */ 554 action = ATA_EH_SUSPEND; 555 if (mesg.event != PM_EVENT_SUSPEND) 556 action |= ATA_EH_PM_FREEZE; 557 ap->eh_info.dev_action[dev->devno] |= action; 558 ap->eh_info.flags |= ATA_EHI_QUIET; 559 ata_port_schedule_eh(ap); 560 561 spin_unlock_irqrestore(ap->lock, flags); 562 563 /* wait for EH to do the job */ 564 ata_port_wait_eh(ap); 565 566 spin_lock_irqsave(ap->lock, flags); 567 568 /* If @sdev is still attached but the associated ATA device 569 * isn't suspended, the operation failed. 570 */ 571 if (sdev->sdev_state != SDEV_OFFLINE && 572 sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL && 573 !(dev->flags & ATA_DFLAG_SUSPENDED)) 574 rc = -EIO; 575 576 out_unlock: 577 spin_unlock_irqrestore(ap->lock, flags); 578 out: 579 if (rc == 0) 580 sdev->sdev_gendev.power.power_state = mesg; 581 return rc; 582 } 583 584 /** 585 * ata_scsi_device_resume - resume ATA device associated with sdev 586 * @sdev: the SCSI device to resume 587 * 588 * Request resume EH action on the ATA device associated with 589 * @sdev and return immediately. This enables parallel 590 * wakeup/spinup of devices. 591 * 592 * LOCKING: 593 * Kernel thread context (may sleep). 594 * 595 * RETURNS: 596 * 0. 597 */ 598 int ata_scsi_device_resume(struct scsi_device *sdev) 599 { 600 struct ata_port *ap = ata_shost_to_port(sdev->host); 601 struct ata_device *dev = ata_scsi_find_dev(ap, sdev); 602 struct ata_eh_info *ehi = &ap->eh_info; 603 unsigned long flags; 604 unsigned int action; 605 606 if (!dev) 607 goto out; 608 609 spin_lock_irqsave(ap->lock, flags); 610 611 /* if @sdev is already detached, nothing to do */ 612 if (sdev->sdev_state == SDEV_OFFLINE || 613 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL) 614 goto out_unlock; 615 616 /* request resume */ 617 action = ATA_EH_RESUME; 618 if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND) 619 __ata_ehi_hotplugged(ehi); 620 else 621 action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET; 622 ehi->dev_action[dev->devno] |= action; 623 624 /* We don't want autopsy and verbose EH messages. Disable 625 * those if we're the only device on this link. 626 */ 627 if (ata_port_max_devices(ap) == 1) 628 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET; 629 630 ata_port_schedule_eh(ap); 631 632 out_unlock: 633 spin_unlock_irqrestore(ap->lock, flags); 634 out: 635 sdev->sdev_gendev.power.power_state = PMSG_ON; 636 return 0; 637 } 638 #endif /* CONFIG_PM */ 639 640 /** 641 * ata_to_sense_error - convert ATA error to SCSI error 642 * @id: ATA device number 643 * @drv_stat: value contained in ATA status register 644 * @drv_err: value contained in ATA error register 645 * @sk: the sense key we'll fill out 646 * @asc: the additional sense code we'll fill out 647 * @ascq: the additional sense code qualifier we'll fill out 648 * @verbose: be verbose 649 * 650 * Converts an ATA error into a SCSI error. Fill out pointers to 651 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 652 * format sense blocks. 653 * 654 * LOCKING: 655 * spin_lock_irqsave(host lock) 656 */ 657 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 658 u8 *asc, u8 *ascq, int verbose) 659 { 660 int i; 661 662 /* Based on the 3ware driver translation table */ 663 static const unsigned char sense_table[][4] = { 664 /* BBD|ECC|ID|MAR */ 665 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 666 /* BBD|ECC|ID */ 667 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 668 /* ECC|MC|MARK */ 669 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 670 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 671 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 672 /* MC|ID|ABRT|TRK0|MARK */ 673 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 674 /* MCR|MARK */ 675 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 676 /* Bad address mark */ 677 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 678 /* TRK0 */ 679 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 680 /* Abort & !ICRC */ 681 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 682 /* Media change request */ 683 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 684 /* SRV */ 685 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 686 /* Media change */ 687 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 688 /* ECC */ 689 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 690 /* BBD - block marked bad */ 691 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 692 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 693 }; 694 static const unsigned char stat_table[][4] = { 695 /* Must be first because BUSY means no other bits valid */ 696 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 697 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 698 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 699 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 700 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 701 }; 702 703 /* 704 * Is this an error we can process/parse 705 */ 706 if (drv_stat & ATA_BUSY) { 707 drv_err = 0; /* Ignore the err bits, they're invalid */ 708 } 709 710 if (drv_err) { 711 /* Look for drv_err */ 712 for (i = 0; sense_table[i][0] != 0xFF; i++) { 713 /* Look for best matches first */ 714 if ((sense_table[i][0] & drv_err) == 715 sense_table[i][0]) { 716 *sk = sense_table[i][1]; 717 *asc = sense_table[i][2]; 718 *ascq = sense_table[i][3]; 719 goto translate_done; 720 } 721 } 722 /* No immediate match */ 723 if (verbose) 724 printk(KERN_WARNING "ata%u: no sense translation for " 725 "error 0x%02x\n", id, drv_err); 726 } 727 728 /* Fall back to interpreting status bits */ 729 for (i = 0; stat_table[i][0] != 0xFF; i++) { 730 if (stat_table[i][0] & drv_stat) { 731 *sk = stat_table[i][1]; 732 *asc = stat_table[i][2]; 733 *ascq = stat_table[i][3]; 734 goto translate_done; 735 } 736 } 737 /* No error? Undecoded? */ 738 if (verbose) 739 printk(KERN_WARNING "ata%u: no sense translation for " 740 "status: 0x%02x\n", id, drv_stat); 741 742 /* We need a sensible error return here, which is tricky, and one 743 that won't cause people to do things like return a disk wrongly */ 744 *sk = ABORTED_COMMAND; 745 *asc = 0x00; 746 *ascq = 0x00; 747 748 translate_done: 749 if (verbose) 750 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 751 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 752 id, drv_stat, drv_err, *sk, *asc, *ascq); 753 return; 754 } 755 756 /* 757 * ata_gen_passthru_sense - Generate check condition sense block. 758 * @qc: Command that completed. 759 * 760 * This function is specific to the ATA descriptor format sense 761 * block specified for the ATA pass through commands. Regardless 762 * of whether the command errored or not, return a sense 763 * block. Copy all controller registers into the sense 764 * block. Clear sense key, ASC & ASCQ if there is no error. 765 * 766 * LOCKING: 767 * None. 768 */ 769 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 770 { 771 struct scsi_cmnd *cmd = qc->scsicmd; 772 struct ata_taskfile *tf = &qc->result_tf; 773 unsigned char *sb = cmd->sense_buffer; 774 unsigned char *desc = sb + 8; 775 int verbose = qc->ap->ops->error_handler == NULL; 776 777 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 778 779 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 780 781 /* 782 * Use ata_to_sense_error() to map status register bits 783 * onto sense key, asc & ascq. 784 */ 785 if (qc->err_mask || 786 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 787 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 788 &sb[1], &sb[2], &sb[3], verbose); 789 sb[1] &= 0x0f; 790 } 791 792 /* 793 * Sense data is current and format is descriptor. 794 */ 795 sb[0] = 0x72; 796 797 desc[0] = 0x09; 798 799 /* set length of additional sense data */ 800 sb[7] = 14; 801 desc[1] = 12; 802 803 /* 804 * Copy registers into sense buffer. 805 */ 806 desc[2] = 0x00; 807 desc[3] = tf->feature; /* == error reg */ 808 desc[5] = tf->nsect; 809 desc[7] = tf->lbal; 810 desc[9] = tf->lbam; 811 desc[11] = tf->lbah; 812 desc[12] = tf->device; 813 desc[13] = tf->command; /* == status reg */ 814 815 /* 816 * Fill in Extend bit, and the high order bytes 817 * if applicable. 818 */ 819 if (tf->flags & ATA_TFLAG_LBA48) { 820 desc[2] |= 0x01; 821 desc[4] = tf->hob_nsect; 822 desc[6] = tf->hob_lbal; 823 desc[8] = tf->hob_lbam; 824 desc[10] = tf->hob_lbah; 825 } 826 } 827 828 /** 829 * ata_gen_ata_sense - generate a SCSI fixed sense block 830 * @qc: Command that we are erroring out 831 * 832 * Generate sense block for a failed ATA command @qc. Descriptor 833 * format is used to accomodate LBA48 block address. 834 * 835 * LOCKING: 836 * None. 837 */ 838 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 839 { 840 struct ata_device *dev = qc->dev; 841 struct scsi_cmnd *cmd = qc->scsicmd; 842 struct ata_taskfile *tf = &qc->result_tf; 843 unsigned char *sb = cmd->sense_buffer; 844 unsigned char *desc = sb + 8; 845 int verbose = qc->ap->ops->error_handler == NULL; 846 u64 block; 847 848 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 849 850 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 851 852 /* sense data is current and format is descriptor */ 853 sb[0] = 0x72; 854 855 /* Use ata_to_sense_error() to map status register bits 856 * onto sense key, asc & ascq. 857 */ 858 if (qc->err_mask || 859 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 860 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 861 &sb[1], &sb[2], &sb[3], verbose); 862 sb[1] &= 0x0f; 863 } 864 865 block = ata_tf_read_block(&qc->result_tf, dev); 866 867 /* information sense data descriptor */ 868 sb[7] = 12; 869 desc[0] = 0x00; 870 desc[1] = 10; 871 872 desc[2] |= 0x80; /* valid */ 873 desc[6] = block >> 40; 874 desc[7] = block >> 32; 875 desc[8] = block >> 24; 876 desc[9] = block >> 16; 877 desc[10] = block >> 8; 878 desc[11] = block; 879 } 880 881 static void ata_scsi_sdev_config(struct scsi_device *sdev) 882 { 883 sdev->use_10_for_rw = 1; 884 sdev->use_10_for_ms = 1; 885 } 886 887 static void ata_scsi_dev_config(struct scsi_device *sdev, 888 struct ata_device *dev) 889 { 890 /* configure max sectors */ 891 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 892 893 /* SATA DMA transfers must be multiples of 4 byte, so 894 * we need to pad ATAPI transfers using an extra sg. 895 * Decrement max hw segments accordingly. 896 */ 897 if (dev->class == ATA_DEV_ATAPI) { 898 request_queue_t *q = sdev->request_queue; 899 blk_queue_max_hw_segments(q, q->max_hw_segments - 1); 900 } 901 902 if (dev->flags & ATA_DFLAG_NCQ) { 903 int depth; 904 905 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 906 depth = min(ATA_MAX_QUEUE - 1, depth); 907 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 908 } 909 } 910 911 /** 912 * ata_scsi_slave_config - Set SCSI device attributes 913 * @sdev: SCSI device to examine 914 * 915 * This is called before we actually start reading 916 * and writing to the device, to configure certain 917 * SCSI mid-layer behaviors. 918 * 919 * LOCKING: 920 * Defined by SCSI layer. We don't really care. 921 */ 922 923 int ata_scsi_slave_config(struct scsi_device *sdev) 924 { 925 struct ata_port *ap = ata_shost_to_port(sdev->host); 926 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 927 928 ata_scsi_sdev_config(sdev); 929 930 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD); 931 932 if (dev) 933 ata_scsi_dev_config(sdev, dev); 934 935 return 0; /* scsi layer doesn't check return value, sigh */ 936 } 937 938 /** 939 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 940 * @sdev: SCSI device to be destroyed 941 * 942 * @sdev is about to be destroyed for hot/warm unplugging. If 943 * this unplugging was initiated by libata as indicated by NULL 944 * dev->sdev, this function doesn't have to do anything. 945 * Otherwise, SCSI layer initiated warm-unplug is in progress. 946 * Clear dev->sdev, schedule the device for ATA detach and invoke 947 * EH. 948 * 949 * LOCKING: 950 * Defined by SCSI layer. We don't really care. 951 */ 952 void ata_scsi_slave_destroy(struct scsi_device *sdev) 953 { 954 struct ata_port *ap = ata_shost_to_port(sdev->host); 955 unsigned long flags; 956 struct ata_device *dev; 957 958 if (!ap->ops->error_handler) 959 return; 960 961 spin_lock_irqsave(ap->lock, flags); 962 dev = __ata_scsi_find_dev(ap, sdev); 963 if (dev && dev->sdev) { 964 /* SCSI device already in CANCEL state, no need to offline it */ 965 dev->sdev = NULL; 966 dev->flags |= ATA_DFLAG_DETACH; 967 ata_port_schedule_eh(ap); 968 } 969 spin_unlock_irqrestore(ap->lock, flags); 970 } 971 972 /** 973 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 974 * @sdev: SCSI device to configure queue depth for 975 * @queue_depth: new queue depth 976 * 977 * This is libata standard hostt->change_queue_depth callback. 978 * SCSI will call into this callback when user tries to set queue 979 * depth via sysfs. 980 * 981 * LOCKING: 982 * SCSI layer (we don't care) 983 * 984 * RETURNS: 985 * Newly configured queue depth. 986 */ 987 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 988 { 989 struct ata_port *ap = ata_shost_to_port(sdev->host); 990 struct ata_device *dev; 991 unsigned long flags; 992 993 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 994 return sdev->queue_depth; 995 996 dev = ata_scsi_find_dev(ap, sdev); 997 if (!dev || !ata_dev_enabled(dev)) 998 return sdev->queue_depth; 999 1000 /* NCQ enabled? */ 1001 spin_lock_irqsave(ap->lock, flags); 1002 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1003 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1004 dev->flags |= ATA_DFLAG_NCQ_OFF; 1005 queue_depth = 1; 1006 } 1007 spin_unlock_irqrestore(ap->lock, flags); 1008 1009 /* limit and apply queue depth */ 1010 queue_depth = min(queue_depth, sdev->host->can_queue); 1011 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1012 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 1013 1014 if (sdev->queue_depth == queue_depth) 1015 return -EINVAL; 1016 1017 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 1018 return queue_depth; 1019 } 1020 1021 /** 1022 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 1023 * @qc: Storage for translated ATA taskfile 1024 * 1025 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 1026 * (to start). Perhaps these commands should be preceded by 1027 * CHECK POWER MODE to see what power mode the device is already in. 1028 * [See SAT revision 5 at www.t10.org] 1029 * 1030 * LOCKING: 1031 * spin_lock_irqsave(host lock) 1032 * 1033 * RETURNS: 1034 * Zero on success, non-zero on error. 1035 */ 1036 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 1037 { 1038 struct scsi_cmnd *scmd = qc->scsicmd; 1039 struct ata_taskfile *tf = &qc->tf; 1040 const u8 *cdb = scmd->cmnd; 1041 1042 if (scmd->cmd_len < 5) 1043 goto invalid_fld; 1044 1045 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1046 tf->protocol = ATA_PROT_NODATA; 1047 if (cdb[1] & 0x1) { 1048 ; /* ignore IMMED bit, violates sat-r05 */ 1049 } 1050 if (cdb[4] & 0x2) 1051 goto invalid_fld; /* LOEJ bit set not supported */ 1052 if (((cdb[4] >> 4) & 0xf) != 0) 1053 goto invalid_fld; /* power conditions not supported */ 1054 if (cdb[4] & 0x1) { 1055 tf->nsect = 1; /* 1 sector, lba=0 */ 1056 1057 if (qc->dev->flags & ATA_DFLAG_LBA) { 1058 tf->flags |= ATA_TFLAG_LBA; 1059 1060 tf->lbah = 0x0; 1061 tf->lbam = 0x0; 1062 tf->lbal = 0x0; 1063 tf->device |= ATA_LBA; 1064 } else { 1065 /* CHS */ 1066 tf->lbal = 0x1; /* sect */ 1067 tf->lbam = 0x0; /* cyl low */ 1068 tf->lbah = 0x0; /* cyl high */ 1069 } 1070 1071 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 1072 } else 1073 /* Issue ATA STANDBY IMMEDIATE command */ 1074 tf->command = ATA_CMD_STANDBYNOW1; 1075 1076 /* 1077 * Standby and Idle condition timers could be implemented but that 1078 * would require libata to implement the Power condition mode page 1079 * and allow the user to change it. Changing mode pages requires 1080 * MODE SELECT to be implemented. 1081 */ 1082 1083 return 0; 1084 1085 invalid_fld: 1086 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1087 /* "Invalid field in cbd" */ 1088 return 1; 1089 } 1090 1091 1092 /** 1093 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1094 * @qc: Storage for translated ATA taskfile 1095 * 1096 * Sets up an ATA taskfile to issue FLUSH CACHE or 1097 * FLUSH CACHE EXT. 1098 * 1099 * LOCKING: 1100 * spin_lock_irqsave(host lock) 1101 * 1102 * RETURNS: 1103 * Zero on success, non-zero on error. 1104 */ 1105 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1106 { 1107 struct ata_taskfile *tf = &qc->tf; 1108 1109 tf->flags |= ATA_TFLAG_DEVICE; 1110 tf->protocol = ATA_PROT_NODATA; 1111 1112 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1113 tf->command = ATA_CMD_FLUSH_EXT; 1114 else 1115 tf->command = ATA_CMD_FLUSH; 1116 1117 return 0; 1118 } 1119 1120 /** 1121 * scsi_6_lba_len - Get LBA and transfer length 1122 * @cdb: SCSI command to translate 1123 * 1124 * Calculate LBA and transfer length for 6-byte commands. 1125 * 1126 * RETURNS: 1127 * @plba: the LBA 1128 * @plen: the transfer length 1129 */ 1130 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1131 { 1132 u64 lba = 0; 1133 u32 len = 0; 1134 1135 VPRINTK("six-byte command\n"); 1136 1137 lba |= ((u64)cdb[2]) << 8; 1138 lba |= ((u64)cdb[3]); 1139 1140 len |= ((u32)cdb[4]); 1141 1142 *plba = lba; 1143 *plen = len; 1144 } 1145 1146 /** 1147 * scsi_10_lba_len - Get LBA and transfer length 1148 * @cdb: SCSI command to translate 1149 * 1150 * Calculate LBA and transfer length for 10-byte commands. 1151 * 1152 * RETURNS: 1153 * @plba: the LBA 1154 * @plen: the transfer length 1155 */ 1156 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1157 { 1158 u64 lba = 0; 1159 u32 len = 0; 1160 1161 VPRINTK("ten-byte command\n"); 1162 1163 lba |= ((u64)cdb[2]) << 24; 1164 lba |= ((u64)cdb[3]) << 16; 1165 lba |= ((u64)cdb[4]) << 8; 1166 lba |= ((u64)cdb[5]); 1167 1168 len |= ((u32)cdb[7]) << 8; 1169 len |= ((u32)cdb[8]); 1170 1171 *plba = lba; 1172 *plen = len; 1173 } 1174 1175 /** 1176 * scsi_16_lba_len - Get LBA and transfer length 1177 * @cdb: SCSI command to translate 1178 * 1179 * Calculate LBA and transfer length for 16-byte commands. 1180 * 1181 * RETURNS: 1182 * @plba: the LBA 1183 * @plen: the transfer length 1184 */ 1185 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1186 { 1187 u64 lba = 0; 1188 u32 len = 0; 1189 1190 VPRINTK("sixteen-byte command\n"); 1191 1192 lba |= ((u64)cdb[2]) << 56; 1193 lba |= ((u64)cdb[3]) << 48; 1194 lba |= ((u64)cdb[4]) << 40; 1195 lba |= ((u64)cdb[5]) << 32; 1196 lba |= ((u64)cdb[6]) << 24; 1197 lba |= ((u64)cdb[7]) << 16; 1198 lba |= ((u64)cdb[8]) << 8; 1199 lba |= ((u64)cdb[9]); 1200 1201 len |= ((u32)cdb[10]) << 24; 1202 len |= ((u32)cdb[11]) << 16; 1203 len |= ((u32)cdb[12]) << 8; 1204 len |= ((u32)cdb[13]); 1205 1206 *plba = lba; 1207 *plen = len; 1208 } 1209 1210 /** 1211 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1212 * @qc: Storage for translated ATA taskfile 1213 * 1214 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1215 * 1216 * LOCKING: 1217 * spin_lock_irqsave(host lock) 1218 * 1219 * RETURNS: 1220 * Zero on success, non-zero on error. 1221 */ 1222 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1223 { 1224 struct scsi_cmnd *scmd = qc->scsicmd; 1225 struct ata_taskfile *tf = &qc->tf; 1226 struct ata_device *dev = qc->dev; 1227 u64 dev_sectors = qc->dev->n_sectors; 1228 const u8 *cdb = scmd->cmnd; 1229 u64 block; 1230 u32 n_block; 1231 1232 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1233 tf->protocol = ATA_PROT_NODATA; 1234 1235 if (cdb[0] == VERIFY) { 1236 if (scmd->cmd_len < 10) 1237 goto invalid_fld; 1238 scsi_10_lba_len(cdb, &block, &n_block); 1239 } else if (cdb[0] == VERIFY_16) { 1240 if (scmd->cmd_len < 16) 1241 goto invalid_fld; 1242 scsi_16_lba_len(cdb, &block, &n_block); 1243 } else 1244 goto invalid_fld; 1245 1246 if (!n_block) 1247 goto nothing_to_do; 1248 if (block >= dev_sectors) 1249 goto out_of_range; 1250 if ((block + n_block) > dev_sectors) 1251 goto out_of_range; 1252 1253 if (dev->flags & ATA_DFLAG_LBA) { 1254 tf->flags |= ATA_TFLAG_LBA; 1255 1256 if (lba_28_ok(block, n_block)) { 1257 /* use LBA28 */ 1258 tf->command = ATA_CMD_VERIFY; 1259 tf->device |= (block >> 24) & 0xf; 1260 } else if (lba_48_ok(block, n_block)) { 1261 if (!(dev->flags & ATA_DFLAG_LBA48)) 1262 goto out_of_range; 1263 1264 /* use LBA48 */ 1265 tf->flags |= ATA_TFLAG_LBA48; 1266 tf->command = ATA_CMD_VERIFY_EXT; 1267 1268 tf->hob_nsect = (n_block >> 8) & 0xff; 1269 1270 tf->hob_lbah = (block >> 40) & 0xff; 1271 tf->hob_lbam = (block >> 32) & 0xff; 1272 tf->hob_lbal = (block >> 24) & 0xff; 1273 } else 1274 /* request too large even for LBA48 */ 1275 goto out_of_range; 1276 1277 tf->nsect = n_block & 0xff; 1278 1279 tf->lbah = (block >> 16) & 0xff; 1280 tf->lbam = (block >> 8) & 0xff; 1281 tf->lbal = block & 0xff; 1282 1283 tf->device |= ATA_LBA; 1284 } else { 1285 /* CHS */ 1286 u32 sect, head, cyl, track; 1287 1288 if (!lba_28_ok(block, n_block)) 1289 goto out_of_range; 1290 1291 /* Convert LBA to CHS */ 1292 track = (u32)block / dev->sectors; 1293 cyl = track / dev->heads; 1294 head = track % dev->heads; 1295 sect = (u32)block % dev->sectors + 1; 1296 1297 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1298 (u32)block, track, cyl, head, sect); 1299 1300 /* Check whether the converted CHS can fit. 1301 Cylinder: 0-65535 1302 Head: 0-15 1303 Sector: 1-255*/ 1304 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1305 goto out_of_range; 1306 1307 tf->command = ATA_CMD_VERIFY; 1308 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1309 tf->lbal = sect; 1310 tf->lbam = cyl; 1311 tf->lbah = cyl >> 8; 1312 tf->device |= head; 1313 } 1314 1315 return 0; 1316 1317 invalid_fld: 1318 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1319 /* "Invalid field in cbd" */ 1320 return 1; 1321 1322 out_of_range: 1323 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1324 /* "Logical Block Address out of range" */ 1325 return 1; 1326 1327 nothing_to_do: 1328 scmd->result = SAM_STAT_GOOD; 1329 return 1; 1330 } 1331 1332 /** 1333 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1334 * @qc: Storage for translated ATA taskfile 1335 * 1336 * Converts any of six SCSI read/write commands into the 1337 * ATA counterpart, including starting sector (LBA), 1338 * sector count, and taking into account the device's LBA48 1339 * support. 1340 * 1341 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1342 * %WRITE_16 are currently supported. 1343 * 1344 * LOCKING: 1345 * spin_lock_irqsave(host lock) 1346 * 1347 * RETURNS: 1348 * Zero on success, non-zero on error. 1349 */ 1350 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1351 { 1352 struct scsi_cmnd *scmd = qc->scsicmd; 1353 const u8 *cdb = scmd->cmnd; 1354 unsigned int tf_flags = 0; 1355 u64 block; 1356 u32 n_block; 1357 int rc; 1358 1359 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1360 tf_flags |= ATA_TFLAG_WRITE; 1361 1362 /* Calculate the SCSI LBA, transfer length and FUA. */ 1363 switch (cdb[0]) { 1364 case READ_10: 1365 case WRITE_10: 1366 if (unlikely(scmd->cmd_len < 10)) 1367 goto invalid_fld; 1368 scsi_10_lba_len(cdb, &block, &n_block); 1369 if (unlikely(cdb[1] & (1 << 3))) 1370 tf_flags |= ATA_TFLAG_FUA; 1371 break; 1372 case READ_6: 1373 case WRITE_6: 1374 if (unlikely(scmd->cmd_len < 6)) 1375 goto invalid_fld; 1376 scsi_6_lba_len(cdb, &block, &n_block); 1377 1378 /* for 6-byte r/w commands, transfer length 0 1379 * means 256 blocks of data, not 0 block. 1380 */ 1381 if (!n_block) 1382 n_block = 256; 1383 break; 1384 case READ_16: 1385 case WRITE_16: 1386 if (unlikely(scmd->cmd_len < 16)) 1387 goto invalid_fld; 1388 scsi_16_lba_len(cdb, &block, &n_block); 1389 if (unlikely(cdb[1] & (1 << 3))) 1390 tf_flags |= ATA_TFLAG_FUA; 1391 break; 1392 default: 1393 DPRINTK("no-byte command\n"); 1394 goto invalid_fld; 1395 } 1396 1397 /* Check and compose ATA command */ 1398 if (!n_block) 1399 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1400 * length 0 means transfer 0 block of data. 1401 * However, for ATA R/W commands, sector count 0 means 1402 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1403 * 1404 * WARNING: one or two older ATA drives treat 0 as 0... 1405 */ 1406 goto nothing_to_do; 1407 1408 qc->flags |= ATA_QCFLAG_IO; 1409 qc->nbytes = n_block * ATA_SECT_SIZE; 1410 1411 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1412 qc->tag); 1413 if (likely(rc == 0)) 1414 return 0; 1415 1416 if (rc == -ERANGE) 1417 goto out_of_range; 1418 /* treat all other errors as -EINVAL, fall through */ 1419 invalid_fld: 1420 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1421 /* "Invalid field in cbd" */ 1422 return 1; 1423 1424 out_of_range: 1425 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1426 /* "Logical Block Address out of range" */ 1427 return 1; 1428 1429 nothing_to_do: 1430 scmd->result = SAM_STAT_GOOD; 1431 return 1; 1432 } 1433 1434 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1435 { 1436 struct ata_port *ap = qc->ap; 1437 struct scsi_cmnd *cmd = qc->scsicmd; 1438 u8 *cdb = cmd->cmnd; 1439 int need_sense = (qc->err_mask != 0); 1440 1441 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and 1442 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE 1443 * cache 1444 */ 1445 if (ap->ops->error_handler && 1446 !need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) && 1447 ((qc->tf.feature == SETFEATURES_WC_ON) || 1448 (qc->tf.feature == SETFEATURES_WC_OFF))) { 1449 ap->eh_info.action |= ATA_EH_REVALIDATE; 1450 ata_port_schedule_eh(ap); 1451 } 1452 1453 /* For ATA pass thru (SAT) commands, generate a sense block if 1454 * user mandated it or if there's an error. Note that if we 1455 * generate because the user forced us to, a check condition 1456 * is generated and the ATA register values are returned 1457 * whether the command completed successfully or not. If there 1458 * was no error, SK, ASC and ASCQ will all be zero. 1459 */ 1460 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1461 ((cdb[2] & 0x20) || need_sense)) { 1462 ata_gen_passthru_sense(qc); 1463 } else { 1464 if (!need_sense) { 1465 cmd->result = SAM_STAT_GOOD; 1466 } else { 1467 /* TODO: decide which descriptor format to use 1468 * for 48b LBA devices and call that here 1469 * instead of the fixed desc, which is only 1470 * good for smaller LBA (and maybe CHS?) 1471 * devices. 1472 */ 1473 ata_gen_ata_sense(qc); 1474 } 1475 } 1476 1477 if (need_sense && !ap->ops->error_handler) 1478 ata_dump_status(ap->print_id, &qc->result_tf); 1479 1480 qc->scsidone(cmd); 1481 1482 ata_qc_free(qc); 1483 } 1484 1485 /** 1486 * ata_scmd_need_defer - Check whether we need to defer scmd 1487 * @dev: ATA device to which the command is addressed 1488 * @is_io: Is the command IO (and thus possibly NCQ)? 1489 * 1490 * NCQ and non-NCQ commands cannot run together. As upper layer 1491 * only knows the queue depth, we are responsible for maintaining 1492 * exclusion. This function checks whether a new command can be 1493 * issued to @dev. 1494 * 1495 * LOCKING: 1496 * spin_lock_irqsave(host lock) 1497 * 1498 * RETURNS: 1499 * 1 if deferring is needed, 0 otherwise. 1500 */ 1501 static int ata_scmd_need_defer(struct ata_device *dev, int is_io) 1502 { 1503 struct ata_port *ap = dev->ap; 1504 int is_ncq = is_io && ata_ncq_enabled(dev); 1505 1506 if (is_ncq) { 1507 if (!ata_tag_valid(ap->active_tag)) 1508 return 0; 1509 } else { 1510 if (!ata_tag_valid(ap->active_tag) && !ap->sactive) 1511 return 0; 1512 } 1513 return 1; 1514 } 1515 1516 /** 1517 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1518 * @dev: ATA device to which the command is addressed 1519 * @cmd: SCSI command to execute 1520 * @done: SCSI command completion function 1521 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1522 * 1523 * Our ->queuecommand() function has decided that the SCSI 1524 * command issued can be directly translated into an ATA 1525 * command, rather than handled internally. 1526 * 1527 * This function sets up an ata_queued_cmd structure for the 1528 * SCSI command, and sends that ata_queued_cmd to the hardware. 1529 * 1530 * The xlat_func argument (actor) returns 0 if ready to execute 1531 * ATA command, else 1 to finish translation. If 1 is returned 1532 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1533 * to be set reflecting an error condition or clean (early) 1534 * termination. 1535 * 1536 * LOCKING: 1537 * spin_lock_irqsave(host lock) 1538 * 1539 * RETURNS: 1540 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1541 * needs to be deferred. 1542 */ 1543 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1544 void (*done)(struct scsi_cmnd *), 1545 ata_xlat_func_t xlat_func) 1546 { 1547 struct ata_queued_cmd *qc; 1548 int is_io = xlat_func == ata_scsi_rw_xlat; 1549 1550 VPRINTK("ENTER\n"); 1551 1552 if (unlikely(ata_scmd_need_defer(dev, is_io))) 1553 goto defer; 1554 1555 qc = ata_scsi_qc_new(dev, cmd, done); 1556 if (!qc) 1557 goto err_mem; 1558 1559 /* data is present; dma-map it */ 1560 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1561 cmd->sc_data_direction == DMA_TO_DEVICE) { 1562 if (unlikely(cmd->request_bufflen < 1)) { 1563 ata_dev_printk(dev, KERN_WARNING, 1564 "WARNING: zero len r/w req\n"); 1565 goto err_did; 1566 } 1567 1568 if (cmd->use_sg) 1569 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg); 1570 else 1571 ata_sg_init_one(qc, cmd->request_buffer, 1572 cmd->request_bufflen); 1573 1574 qc->dma_dir = cmd->sc_data_direction; 1575 } 1576 1577 qc->complete_fn = ata_scsi_qc_complete; 1578 1579 if (xlat_func(qc)) 1580 goto early_finish; 1581 1582 /* select device, send command to hardware */ 1583 ata_qc_issue(qc); 1584 1585 VPRINTK("EXIT\n"); 1586 return 0; 1587 1588 early_finish: 1589 ata_qc_free(qc); 1590 done(cmd); 1591 DPRINTK("EXIT - early finish (good or error)\n"); 1592 return 0; 1593 1594 err_did: 1595 ata_qc_free(qc); 1596 cmd->result = (DID_ERROR << 16); 1597 done(cmd); 1598 err_mem: 1599 DPRINTK("EXIT - internal\n"); 1600 return 0; 1601 1602 defer: 1603 DPRINTK("EXIT - defer\n"); 1604 return SCSI_MLQUEUE_DEVICE_BUSY; 1605 } 1606 1607 /** 1608 * ata_scsi_rbuf_get - Map response buffer. 1609 * @cmd: SCSI command containing buffer to be mapped. 1610 * @buf_out: Pointer to mapped area. 1611 * 1612 * Maps buffer contained within SCSI command @cmd. 1613 * 1614 * LOCKING: 1615 * spin_lock_irqsave(host lock) 1616 * 1617 * RETURNS: 1618 * Length of response buffer. 1619 */ 1620 1621 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out) 1622 { 1623 u8 *buf; 1624 unsigned int buflen; 1625 1626 if (cmd->use_sg) { 1627 struct scatterlist *sg; 1628 1629 sg = (struct scatterlist *) cmd->request_buffer; 1630 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset; 1631 buflen = sg->length; 1632 } else { 1633 buf = cmd->request_buffer; 1634 buflen = cmd->request_bufflen; 1635 } 1636 1637 *buf_out = buf; 1638 return buflen; 1639 } 1640 1641 /** 1642 * ata_scsi_rbuf_put - Unmap response buffer. 1643 * @cmd: SCSI command containing buffer to be unmapped. 1644 * @buf: buffer to unmap 1645 * 1646 * Unmaps response buffer contained within @cmd. 1647 * 1648 * LOCKING: 1649 * spin_lock_irqsave(host lock) 1650 */ 1651 1652 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf) 1653 { 1654 if (cmd->use_sg) { 1655 struct scatterlist *sg; 1656 1657 sg = (struct scatterlist *) cmd->request_buffer; 1658 kunmap_atomic(buf - sg->offset, KM_IRQ0); 1659 } 1660 } 1661 1662 /** 1663 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1664 * @args: device IDENTIFY data / SCSI command of interest. 1665 * @actor: Callback hook for desired SCSI command simulator 1666 * 1667 * Takes care of the hard work of simulating a SCSI command... 1668 * Mapping the response buffer, calling the command's handler, 1669 * and handling the handler's return value. This return value 1670 * indicates whether the handler wishes the SCSI command to be 1671 * completed successfully (0), or not (in which case cmd->result 1672 * and sense buffer are assumed to be set). 1673 * 1674 * LOCKING: 1675 * spin_lock_irqsave(host lock) 1676 */ 1677 1678 void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1679 unsigned int (*actor) (struct ata_scsi_args *args, 1680 u8 *rbuf, unsigned int buflen)) 1681 { 1682 u8 *rbuf; 1683 unsigned int buflen, rc; 1684 struct scsi_cmnd *cmd = args->cmd; 1685 1686 buflen = ata_scsi_rbuf_get(cmd, &rbuf); 1687 memset(rbuf, 0, buflen); 1688 rc = actor(args, rbuf, buflen); 1689 ata_scsi_rbuf_put(cmd, rbuf); 1690 1691 if (rc == 0) 1692 cmd->result = SAM_STAT_GOOD; 1693 args->done(cmd); 1694 } 1695 1696 /** 1697 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer 1698 * @idx: byte index into SCSI response buffer 1699 * @val: value to set 1700 * 1701 * To be used by SCSI command simulator functions. This macros 1702 * expects two local variables, u8 *rbuf and unsigned int buflen, 1703 * are in scope. 1704 * 1705 * LOCKING: 1706 * None. 1707 */ 1708 #define ATA_SCSI_RBUF_SET(idx, val) do { \ 1709 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \ 1710 } while (0) 1711 1712 /** 1713 * ata_scsiop_inq_std - Simulate INQUIRY command 1714 * @args: device IDENTIFY data / SCSI command of interest. 1715 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1716 * @buflen: Response buffer length. 1717 * 1718 * Returns standard device identification data associated 1719 * with non-VPD INQUIRY command output. 1720 * 1721 * LOCKING: 1722 * spin_lock_irqsave(host lock) 1723 */ 1724 1725 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf, 1726 unsigned int buflen) 1727 { 1728 u8 hdr[] = { 1729 TYPE_DISK, 1730 0, 1731 0x5, /* claim SPC-3 version compatibility */ 1732 2, 1733 95 - 4 1734 }; 1735 1736 /* set scsi removeable (RMB) bit per ata bit */ 1737 if (ata_id_removeable(args->id)) 1738 hdr[1] |= (1 << 7); 1739 1740 VPRINTK("ENTER\n"); 1741 1742 memcpy(rbuf, hdr, sizeof(hdr)); 1743 1744 if (buflen > 35) { 1745 memcpy(&rbuf[8], "ATA ", 8); 1746 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1747 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1748 if (rbuf[32] == 0 || rbuf[32] == ' ') 1749 memcpy(&rbuf[32], "n/a ", 4); 1750 } 1751 1752 if (buflen > 63) { 1753 const u8 versions[] = { 1754 0x60, /* SAM-3 (no version claimed) */ 1755 1756 0x03, 1757 0x20, /* SBC-2 (no version claimed) */ 1758 1759 0x02, 1760 0x60 /* SPC-3 (no version claimed) */ 1761 }; 1762 1763 memcpy(rbuf + 59, versions, sizeof(versions)); 1764 } 1765 1766 return 0; 1767 } 1768 1769 /** 1770 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1771 * @args: device IDENTIFY data / SCSI command of interest. 1772 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1773 * @buflen: Response buffer length. 1774 * 1775 * Returns list of inquiry VPD pages available. 1776 * 1777 * LOCKING: 1778 * spin_lock_irqsave(host lock) 1779 */ 1780 1781 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf, 1782 unsigned int buflen) 1783 { 1784 const u8 pages[] = { 1785 0x00, /* page 0x00, this page */ 1786 0x80, /* page 0x80, unit serial no page */ 1787 0x83 /* page 0x83, device ident page */ 1788 }; 1789 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1790 1791 if (buflen > 6) 1792 memcpy(rbuf + 4, pages, sizeof(pages)); 1793 1794 return 0; 1795 } 1796 1797 /** 1798 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1799 * @args: device IDENTIFY data / SCSI command of interest. 1800 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1801 * @buflen: Response buffer length. 1802 * 1803 * Returns ATA device serial number. 1804 * 1805 * LOCKING: 1806 * spin_lock_irqsave(host lock) 1807 */ 1808 1809 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf, 1810 unsigned int buflen) 1811 { 1812 const u8 hdr[] = { 1813 0, 1814 0x80, /* this page code */ 1815 0, 1816 ATA_ID_SERNO_LEN, /* page len */ 1817 }; 1818 memcpy(rbuf, hdr, sizeof(hdr)); 1819 1820 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1)) 1821 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1822 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1823 1824 return 0; 1825 } 1826 1827 /** 1828 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1829 * @args: device IDENTIFY data / SCSI command of interest. 1830 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1831 * @buflen: Response buffer length. 1832 * 1833 * Yields two logical unit device identification designators: 1834 * - vendor specific ASCII containing the ATA serial number 1835 * - SAT defined "t10 vendor id based" containing ASCII vendor 1836 * name ("ATA "), model and serial numbers. 1837 * 1838 * LOCKING: 1839 * spin_lock_irqsave(host lock) 1840 */ 1841 1842 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf, 1843 unsigned int buflen) 1844 { 1845 int num; 1846 const int sat_model_serial_desc_len = 68; 1847 1848 rbuf[1] = 0x83; /* this page code */ 1849 num = 4; 1850 1851 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) { 1852 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1853 rbuf[num + 0] = 2; 1854 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1855 num += 4; 1856 ata_id_string(args->id, (unsigned char *) rbuf + num, 1857 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1858 num += ATA_ID_SERNO_LEN; 1859 } 1860 if (buflen > (sat_model_serial_desc_len + num + 3)) { 1861 /* SAT defined lu model and serial numbers descriptor */ 1862 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1863 rbuf[num + 0] = 2; 1864 rbuf[num + 1] = 1; 1865 rbuf[num + 3] = sat_model_serial_desc_len; 1866 num += 4; 1867 memcpy(rbuf + num, "ATA ", 8); 1868 num += 8; 1869 ata_id_string(args->id, (unsigned char *) rbuf + num, 1870 ATA_ID_PROD, ATA_ID_PROD_LEN); 1871 num += ATA_ID_PROD_LEN; 1872 ata_id_string(args->id, (unsigned char *) rbuf + num, 1873 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1874 num += ATA_ID_SERNO_LEN; 1875 } 1876 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 1877 return 0; 1878 } 1879 1880 /** 1881 * ata_scsiop_noop - Command handler that simply returns success. 1882 * @args: device IDENTIFY data / SCSI command of interest. 1883 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1884 * @buflen: Response buffer length. 1885 * 1886 * No operation. Simply returns success to caller, to indicate 1887 * that the caller should successfully complete this SCSI command. 1888 * 1889 * LOCKING: 1890 * spin_lock_irqsave(host lock) 1891 */ 1892 1893 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf, 1894 unsigned int buflen) 1895 { 1896 VPRINTK("ENTER\n"); 1897 return 0; 1898 } 1899 1900 /** 1901 * ata_msense_push - Push data onto MODE SENSE data output buffer 1902 * @ptr_io: (input/output) Location to store more output data 1903 * @last: End of output data buffer 1904 * @buf: Pointer to BLOB being added to output buffer 1905 * @buflen: Length of BLOB 1906 * 1907 * Store MODE SENSE data on an output buffer. 1908 * 1909 * LOCKING: 1910 * None. 1911 */ 1912 1913 static void ata_msense_push(u8 **ptr_io, const u8 *last, 1914 const u8 *buf, unsigned int buflen) 1915 { 1916 u8 *ptr = *ptr_io; 1917 1918 if ((ptr + buflen - 1) > last) 1919 return; 1920 1921 memcpy(ptr, buf, buflen); 1922 1923 ptr += buflen; 1924 1925 *ptr_io = ptr; 1926 } 1927 1928 /** 1929 * ata_msense_caching - Simulate MODE SENSE caching info page 1930 * @id: device IDENTIFY data 1931 * @ptr_io: (input/output) Location to store more output data 1932 * @last: End of output data buffer 1933 * 1934 * Generate a caching info page, which conditionally indicates 1935 * write caching to the SCSI layer, depending on device 1936 * capabilities. 1937 * 1938 * LOCKING: 1939 * None. 1940 */ 1941 1942 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io, 1943 const u8 *last) 1944 { 1945 u8 page[CACHE_MPAGE_LEN]; 1946 1947 memcpy(page, def_cache_mpage, sizeof(page)); 1948 if (ata_id_wcache_enabled(id)) 1949 page[2] |= (1 << 2); /* write cache enable */ 1950 if (!ata_id_rahead_enabled(id)) 1951 page[12] |= (1 << 5); /* disable read ahead */ 1952 1953 ata_msense_push(ptr_io, last, page, sizeof(page)); 1954 return sizeof(page); 1955 } 1956 1957 /** 1958 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 1959 * @dev: Device associated with this MODE SENSE command 1960 * @ptr_io: (input/output) Location to store more output data 1961 * @last: End of output data buffer 1962 * 1963 * Generate a generic MODE SENSE control mode page. 1964 * 1965 * LOCKING: 1966 * None. 1967 */ 1968 1969 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last) 1970 { 1971 ata_msense_push(ptr_io, last, def_control_mpage, 1972 sizeof(def_control_mpage)); 1973 return sizeof(def_control_mpage); 1974 } 1975 1976 /** 1977 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 1978 * @dev: Device associated with this MODE SENSE command 1979 * @ptr_io: (input/output) Location to store more output data 1980 * @last: End of output data buffer 1981 * 1982 * Generate a generic MODE SENSE r/w error recovery page. 1983 * 1984 * LOCKING: 1985 * None. 1986 */ 1987 1988 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last) 1989 { 1990 1991 ata_msense_push(ptr_io, last, def_rw_recovery_mpage, 1992 sizeof(def_rw_recovery_mpage)); 1993 return sizeof(def_rw_recovery_mpage); 1994 } 1995 1996 /* 1997 * We can turn this into a real blacklist if it's needed, for now just 1998 * blacklist any Maxtor BANC1G10 revision firmware 1999 */ 2000 static int ata_dev_supports_fua(u16 *id) 2001 { 2002 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 2003 2004 if (!libata_fua) 2005 return 0; 2006 if (!ata_id_has_fua(id)) 2007 return 0; 2008 2009 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 2010 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 2011 2012 if (strcmp(model, "Maxtor")) 2013 return 1; 2014 if (strcmp(fw, "BANC1G10")) 2015 return 1; 2016 2017 return 0; /* blacklisted */ 2018 } 2019 2020 /** 2021 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 2022 * @args: device IDENTIFY data / SCSI command of interest. 2023 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2024 * @buflen: Response buffer length. 2025 * 2026 * Simulate MODE SENSE commands. Assume this is invoked for direct 2027 * access devices (e.g. disks) only. There should be no block 2028 * descriptor for other device types. 2029 * 2030 * LOCKING: 2031 * spin_lock_irqsave(host lock) 2032 */ 2033 2034 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf, 2035 unsigned int buflen) 2036 { 2037 struct ata_device *dev = args->dev; 2038 u8 *scsicmd = args->cmd->cmnd, *p, *last; 2039 const u8 sat_blk_desc[] = { 2040 0, 0, 0, 0, /* number of blocks: sat unspecified */ 2041 0, 2042 0, 0x2, 0x0 /* block length: 512 bytes */ 2043 }; 2044 u8 pg, spg; 2045 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen; 2046 u8 dpofua; 2047 2048 VPRINTK("ENTER\n"); 2049 2050 six_byte = (scsicmd[0] == MODE_SENSE); 2051 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 2052 /* 2053 * LLBA bit in msense(10) ignored (compliant) 2054 */ 2055 2056 page_control = scsicmd[2] >> 6; 2057 switch (page_control) { 2058 case 0: /* current */ 2059 break; /* supported */ 2060 case 3: /* saved */ 2061 goto saving_not_supp; 2062 case 1: /* changeable */ 2063 case 2: /* defaults */ 2064 default: 2065 goto invalid_fld; 2066 } 2067 2068 if (six_byte) { 2069 output_len = 4 + (ebd ? 8 : 0); 2070 alloc_len = scsicmd[4]; 2071 } else { 2072 output_len = 8 + (ebd ? 8 : 0); 2073 alloc_len = (scsicmd[7] << 8) + scsicmd[8]; 2074 } 2075 minlen = (alloc_len < buflen) ? alloc_len : buflen; 2076 2077 p = rbuf + output_len; 2078 last = rbuf + minlen - 1; 2079 2080 pg = scsicmd[2] & 0x3f; 2081 spg = scsicmd[3]; 2082 /* 2083 * No mode subpages supported (yet) but asking for _all_ 2084 * subpages may be valid 2085 */ 2086 if (spg && (spg != ALL_SUB_MPAGES)) 2087 goto invalid_fld; 2088 2089 switch(pg) { 2090 case RW_RECOVERY_MPAGE: 2091 output_len += ata_msense_rw_recovery(&p, last); 2092 break; 2093 2094 case CACHE_MPAGE: 2095 output_len += ata_msense_caching(args->id, &p, last); 2096 break; 2097 2098 case CONTROL_MPAGE: { 2099 output_len += ata_msense_ctl_mode(&p, last); 2100 break; 2101 } 2102 2103 case ALL_MPAGES: 2104 output_len += ata_msense_rw_recovery(&p, last); 2105 output_len += ata_msense_caching(args->id, &p, last); 2106 output_len += ata_msense_ctl_mode(&p, last); 2107 break; 2108 2109 default: /* invalid page code */ 2110 goto invalid_fld; 2111 } 2112 2113 if (minlen < 1) 2114 return 0; 2115 2116 dpofua = 0; 2117 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2118 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2119 dpofua = 1 << 4; 2120 2121 if (six_byte) { 2122 output_len--; 2123 rbuf[0] = output_len; 2124 if (minlen > 2) 2125 rbuf[2] |= dpofua; 2126 if (ebd) { 2127 if (minlen > 3) 2128 rbuf[3] = sizeof(sat_blk_desc); 2129 if (minlen > 11) 2130 memcpy(rbuf + 4, sat_blk_desc, 2131 sizeof(sat_blk_desc)); 2132 } 2133 } else { 2134 output_len -= 2; 2135 rbuf[0] = output_len >> 8; 2136 if (minlen > 1) 2137 rbuf[1] = output_len; 2138 if (minlen > 3) 2139 rbuf[3] |= dpofua; 2140 if (ebd) { 2141 if (minlen > 7) 2142 rbuf[7] = sizeof(sat_blk_desc); 2143 if (minlen > 15) 2144 memcpy(rbuf + 8, sat_blk_desc, 2145 sizeof(sat_blk_desc)); 2146 } 2147 } 2148 return 0; 2149 2150 invalid_fld: 2151 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2152 /* "Invalid field in cbd" */ 2153 return 1; 2154 2155 saving_not_supp: 2156 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2157 /* "Saving parameters not supported" */ 2158 return 1; 2159 } 2160 2161 /** 2162 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2163 * @args: device IDENTIFY data / SCSI command of interest. 2164 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2165 * @buflen: Response buffer length. 2166 * 2167 * Simulate READ CAPACITY commands. 2168 * 2169 * LOCKING: 2170 * None. 2171 */ 2172 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf, 2173 unsigned int buflen) 2174 { 2175 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */ 2176 2177 VPRINTK("ENTER\n"); 2178 2179 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2180 if (last_lba >= 0xffffffffULL) 2181 last_lba = 0xffffffff; 2182 2183 /* sector count, 32-bit */ 2184 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3)); 2185 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2)); 2186 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1)); 2187 ATA_SCSI_RBUF_SET(3, last_lba); 2188 2189 /* sector size */ 2190 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8); 2191 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE); 2192 } else { 2193 /* sector count, 64-bit */ 2194 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7)); 2195 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6)); 2196 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5)); 2197 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4)); 2198 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3)); 2199 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2)); 2200 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1)); 2201 ATA_SCSI_RBUF_SET(7, last_lba); 2202 2203 /* sector size */ 2204 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8); 2205 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE); 2206 } 2207 2208 return 0; 2209 } 2210 2211 /** 2212 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2213 * @args: device IDENTIFY data / SCSI command of interest. 2214 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2215 * @buflen: Response buffer length. 2216 * 2217 * Simulate REPORT LUNS command. 2218 * 2219 * LOCKING: 2220 * spin_lock_irqsave(host lock) 2221 */ 2222 2223 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf, 2224 unsigned int buflen) 2225 { 2226 VPRINTK("ENTER\n"); 2227 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2228 2229 return 0; 2230 } 2231 2232 /** 2233 * ata_scsi_set_sense - Set SCSI sense data and status 2234 * @cmd: SCSI request to be handled 2235 * @sk: SCSI-defined sense key 2236 * @asc: SCSI-defined additional sense code 2237 * @ascq: SCSI-defined additional sense code qualifier 2238 * 2239 * Helper function that builds a valid fixed format, current 2240 * response code and the given sense key (sk), additional sense 2241 * code (asc) and additional sense code qualifier (ascq) with 2242 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and 2243 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result . 2244 * 2245 * LOCKING: 2246 * Not required 2247 */ 2248 2249 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 2250 { 2251 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 2252 2253 cmd->sense_buffer[0] = 0x70; /* fixed format, current */ 2254 cmd->sense_buffer[2] = sk; 2255 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */ 2256 cmd->sense_buffer[12] = asc; 2257 cmd->sense_buffer[13] = ascq; 2258 } 2259 2260 /** 2261 * ata_scsi_badcmd - End a SCSI request with an error 2262 * @cmd: SCSI request to be handled 2263 * @done: SCSI command completion function 2264 * @asc: SCSI-defined additional sense code 2265 * @ascq: SCSI-defined additional sense code qualifier 2266 * 2267 * Helper function that completes a SCSI command with 2268 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST 2269 * and the specified additional sense codes. 2270 * 2271 * LOCKING: 2272 * spin_lock_irqsave(host lock) 2273 */ 2274 2275 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq) 2276 { 2277 DPRINTK("ENTER\n"); 2278 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq); 2279 2280 done(cmd); 2281 } 2282 2283 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2284 { 2285 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2286 /* FIXME: not quite right; we don't want the 2287 * translation of taskfile registers into 2288 * a sense descriptors, since that's only 2289 * correct for ATA, not ATAPI 2290 */ 2291 ata_gen_passthru_sense(qc); 2292 } 2293 2294 qc->scsidone(qc->scsicmd); 2295 ata_qc_free(qc); 2296 } 2297 2298 /* is it pointless to prefer PIO for "safety reasons"? */ 2299 static inline int ata_pio_use_silly(struct ata_port *ap) 2300 { 2301 return (ap->flags & ATA_FLAG_PIO_DMA); 2302 } 2303 2304 static void atapi_request_sense(struct ata_queued_cmd *qc) 2305 { 2306 struct ata_port *ap = qc->ap; 2307 struct scsi_cmnd *cmd = qc->scsicmd; 2308 2309 DPRINTK("ATAPI request sense\n"); 2310 2311 /* FIXME: is this needed? */ 2312 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); 2313 2314 ap->ops->tf_read(ap, &qc->tf); 2315 2316 /* fill these in, for the case where they are -not- overwritten */ 2317 cmd->sense_buffer[0] = 0x70; 2318 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2319 2320 ata_qc_reinit(qc); 2321 2322 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer)); 2323 qc->dma_dir = DMA_FROM_DEVICE; 2324 2325 memset(&qc->cdb, 0, qc->dev->cdb_len); 2326 qc->cdb[0] = REQUEST_SENSE; 2327 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2328 2329 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2330 qc->tf.command = ATA_CMD_PACKET; 2331 2332 if (ata_pio_use_silly(ap)) { 2333 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2334 qc->tf.feature |= ATAPI_PKT_DMA; 2335 } else { 2336 qc->tf.protocol = ATA_PROT_ATAPI; 2337 qc->tf.lbam = (8 * 1024) & 0xff; 2338 qc->tf.lbah = (8 * 1024) >> 8; 2339 } 2340 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2341 2342 qc->complete_fn = atapi_sense_complete; 2343 2344 ata_qc_issue(qc); 2345 2346 DPRINTK("EXIT\n"); 2347 } 2348 2349 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2350 { 2351 struct scsi_cmnd *cmd = qc->scsicmd; 2352 unsigned int err_mask = qc->err_mask; 2353 2354 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2355 2356 /* handle completion from new EH */ 2357 if (unlikely(qc->ap->ops->error_handler && 2358 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2359 2360 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2361 /* FIXME: not quite right; we don't want the 2362 * translation of taskfile registers into a 2363 * sense descriptors, since that's only 2364 * correct for ATA, not ATAPI 2365 */ 2366 ata_gen_passthru_sense(qc); 2367 } 2368 2369 /* SCSI EH automatically locks door if sdev->locked is 2370 * set. Sometimes door lock request continues to 2371 * fail, for example, when no media is present. This 2372 * creates a loop - SCSI EH issues door lock which 2373 * fails and gets invoked again to acquire sense data 2374 * for the failed command. 2375 * 2376 * If door lock fails, always clear sdev->locked to 2377 * avoid this infinite loop. 2378 */ 2379 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2380 qc->dev->sdev->locked = 0; 2381 2382 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2383 qc->scsidone(cmd); 2384 ata_qc_free(qc); 2385 return; 2386 } 2387 2388 /* successful completion or old EH failure path */ 2389 if (unlikely(err_mask & AC_ERR_DEV)) { 2390 cmd->result = SAM_STAT_CHECK_CONDITION; 2391 atapi_request_sense(qc); 2392 return; 2393 } else if (unlikely(err_mask)) { 2394 /* FIXME: not quite right; we don't want the 2395 * translation of taskfile registers into 2396 * a sense descriptors, since that's only 2397 * correct for ATA, not ATAPI 2398 */ 2399 ata_gen_passthru_sense(qc); 2400 } else { 2401 u8 *scsicmd = cmd->cmnd; 2402 2403 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2404 u8 *buf = NULL; 2405 unsigned int buflen; 2406 2407 buflen = ata_scsi_rbuf_get(cmd, &buf); 2408 2409 /* ATAPI devices typically report zero for their SCSI version, 2410 * and sometimes deviate from the spec WRT response data 2411 * format. If SCSI version is reported as zero like normal, 2412 * then we make the following fixups: 1) Fake MMC-5 version, 2413 * to indicate to the Linux scsi midlayer this is a modern 2414 * device. 2) Ensure response data format / ATAPI information 2415 * are always correct. 2416 */ 2417 if (buf[2] == 0) { 2418 buf[2] = 0x5; 2419 buf[3] = 0x32; 2420 } 2421 2422 ata_scsi_rbuf_put(cmd, buf); 2423 } 2424 2425 cmd->result = SAM_STAT_GOOD; 2426 } 2427 2428 qc->scsidone(cmd); 2429 ata_qc_free(qc); 2430 } 2431 /** 2432 * atapi_xlat - Initialize PACKET taskfile 2433 * @qc: command structure to be initialized 2434 * 2435 * LOCKING: 2436 * spin_lock_irqsave(host lock) 2437 * 2438 * RETURNS: 2439 * Zero on success, non-zero on failure. 2440 */ 2441 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2442 { 2443 struct scsi_cmnd *scmd = qc->scsicmd; 2444 struct ata_device *dev = qc->dev; 2445 int using_pio = (dev->flags & ATA_DFLAG_PIO); 2446 int nodata = (scmd->sc_data_direction == DMA_NONE); 2447 2448 if (!using_pio) 2449 /* Check whether ATAPI DMA is safe */ 2450 if (ata_check_atapi_dma(qc)) 2451 using_pio = 1; 2452 2453 memset(qc->cdb, 0, dev->cdb_len); 2454 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2455 2456 qc->complete_fn = atapi_qc_complete; 2457 2458 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2459 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2460 qc->tf.flags |= ATA_TFLAG_WRITE; 2461 DPRINTK("direction: write\n"); 2462 } 2463 2464 qc->tf.command = ATA_CMD_PACKET; 2465 2466 /* no data, or PIO data xfer */ 2467 if (using_pio || nodata) { 2468 if (nodata) 2469 qc->tf.protocol = ATA_PROT_ATAPI_NODATA; 2470 else 2471 qc->tf.protocol = ATA_PROT_ATAPI; 2472 qc->tf.lbam = (8 * 1024) & 0xff; 2473 qc->tf.lbah = (8 * 1024) >> 8; 2474 } 2475 2476 /* DMA data xfer */ 2477 else { 2478 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2479 qc->tf.feature |= ATAPI_PKT_DMA; 2480 2481 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE)) 2482 /* some SATA bridges need us to indicate data xfer direction */ 2483 qc->tf.feature |= ATAPI_DMADIR; 2484 } 2485 2486 qc->nbytes = scmd->request_bufflen; 2487 2488 return 0; 2489 } 2490 2491 static struct ata_device * ata_find_dev(struct ata_port *ap, int id) 2492 { 2493 if (likely(id < ATA_MAX_DEVICES)) 2494 return &ap->device[id]; 2495 return NULL; 2496 } 2497 2498 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap, 2499 const struct scsi_device *scsidev) 2500 { 2501 /* skip commands not addressed to targets we simulate */ 2502 if (unlikely(scsidev->channel || scsidev->lun)) 2503 return NULL; 2504 2505 return ata_find_dev(ap, scsidev->id); 2506 } 2507 2508 /** 2509 * ata_scsi_dev_enabled - determine if device is enabled 2510 * @dev: ATA device 2511 * 2512 * Determine if commands should be sent to the specified device. 2513 * 2514 * LOCKING: 2515 * spin_lock_irqsave(host lock) 2516 * 2517 * RETURNS: 2518 * 0 if commands are not allowed / 1 if commands are allowed 2519 */ 2520 2521 static int ata_scsi_dev_enabled(struct ata_device *dev) 2522 { 2523 if (unlikely(!ata_dev_enabled(dev))) 2524 return 0; 2525 2526 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) { 2527 if (unlikely(dev->class == ATA_DEV_ATAPI)) { 2528 ata_dev_printk(dev, KERN_WARNING, 2529 "WARNING: ATAPI is %s, device ignored.\n", 2530 atapi_enabled ? "not supported with this driver" : "disabled"); 2531 return 0; 2532 } 2533 } 2534 2535 return 1; 2536 } 2537 2538 /** 2539 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2540 * @ap: ATA port to which the device is attached 2541 * @scsidev: SCSI device from which we derive the ATA device 2542 * 2543 * Given various information provided in struct scsi_cmnd, 2544 * map that onto an ATA bus, and using that mapping 2545 * determine which ata_device is associated with the 2546 * SCSI command to be sent. 2547 * 2548 * LOCKING: 2549 * spin_lock_irqsave(host lock) 2550 * 2551 * RETURNS: 2552 * Associated ATA device, or %NULL if not found. 2553 */ 2554 static struct ata_device * 2555 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2556 { 2557 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2558 2559 if (unlikely(!dev || !ata_scsi_dev_enabled(dev))) 2560 return NULL; 2561 2562 return dev; 2563 } 2564 2565 /* 2566 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2567 * @byte1: Byte 1 from pass-thru CDB. 2568 * 2569 * RETURNS: 2570 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2571 */ 2572 static u8 2573 ata_scsi_map_proto(u8 byte1) 2574 { 2575 switch((byte1 & 0x1e) >> 1) { 2576 case 3: /* Non-data */ 2577 return ATA_PROT_NODATA; 2578 2579 case 6: /* DMA */ 2580 return ATA_PROT_DMA; 2581 2582 case 4: /* PIO Data-in */ 2583 case 5: /* PIO Data-out */ 2584 return ATA_PROT_PIO; 2585 2586 case 10: /* Device Reset */ 2587 case 0: /* Hard Reset */ 2588 case 1: /* SRST */ 2589 case 2: /* Bus Idle */ 2590 case 7: /* Packet */ 2591 case 8: /* DMA Queued */ 2592 case 9: /* Device Diagnostic */ 2593 case 11: /* UDMA Data-in */ 2594 case 12: /* UDMA Data-Out */ 2595 case 13: /* FPDMA */ 2596 default: /* Reserved */ 2597 break; 2598 } 2599 2600 return ATA_PROT_UNKNOWN; 2601 } 2602 2603 /** 2604 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2605 * @qc: command structure to be initialized 2606 * 2607 * Handles either 12 or 16-byte versions of the CDB. 2608 * 2609 * RETURNS: 2610 * Zero on success, non-zero on failure. 2611 */ 2612 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2613 { 2614 struct ata_taskfile *tf = &(qc->tf); 2615 struct scsi_cmnd *scmd = qc->scsicmd; 2616 struct ata_device *dev = qc->dev; 2617 const u8 *cdb = scmd->cmnd; 2618 2619 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2620 goto invalid_fld; 2621 2622 /* We may not issue DMA commands if no DMA mode is set */ 2623 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2624 goto invalid_fld; 2625 2626 if (cdb[1] & 0xe0) 2627 /* PIO multi not supported yet */ 2628 goto invalid_fld; 2629 2630 /* 2631 * 12 and 16 byte CDBs use different offsets to 2632 * provide the various register values. 2633 */ 2634 if (cdb[0] == ATA_16) { 2635 /* 2636 * 16-byte CDB - may contain extended commands. 2637 * 2638 * If that is the case, copy the upper byte register values. 2639 */ 2640 if (cdb[1] & 0x01) { 2641 tf->hob_feature = cdb[3]; 2642 tf->hob_nsect = cdb[5]; 2643 tf->hob_lbal = cdb[7]; 2644 tf->hob_lbam = cdb[9]; 2645 tf->hob_lbah = cdb[11]; 2646 tf->flags |= ATA_TFLAG_LBA48; 2647 } else 2648 tf->flags &= ~ATA_TFLAG_LBA48; 2649 2650 /* 2651 * Always copy low byte, device and command registers. 2652 */ 2653 tf->feature = cdb[4]; 2654 tf->nsect = cdb[6]; 2655 tf->lbal = cdb[8]; 2656 tf->lbam = cdb[10]; 2657 tf->lbah = cdb[12]; 2658 tf->device = cdb[13]; 2659 tf->command = cdb[14]; 2660 } else { 2661 /* 2662 * 12-byte CDB - incapable of extended commands. 2663 */ 2664 tf->flags &= ~ATA_TFLAG_LBA48; 2665 2666 tf->feature = cdb[3]; 2667 tf->nsect = cdb[4]; 2668 tf->lbal = cdb[5]; 2669 tf->lbam = cdb[6]; 2670 tf->lbah = cdb[7]; 2671 tf->device = cdb[8]; 2672 tf->command = cdb[9]; 2673 } 2674 /* 2675 * If slave is possible, enforce correct master/slave bit 2676 */ 2677 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS) 2678 tf->device = qc->dev->devno ? 2679 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2680 2681 /* 2682 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2683 * SET_FEATURES - XFER MODE must be preceded/succeeded 2684 * by an update to hardware-specific registers for each 2685 * controller (i.e. the reason for ->set_piomode(), 2686 * ->set_dmamode(), and ->post_set_mode() hooks). 2687 */ 2688 if ((tf->command == ATA_CMD_SET_FEATURES) 2689 && (tf->feature == SETFEATURES_XFER)) 2690 goto invalid_fld; 2691 2692 /* 2693 * Set flags so that all registers will be written, 2694 * and pass on write indication (used for PIO/DMA 2695 * setup.) 2696 */ 2697 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2698 2699 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2700 tf->flags |= ATA_TFLAG_WRITE; 2701 2702 /* 2703 * Set transfer length. 2704 * 2705 * TODO: find out if we need to do more here to 2706 * cover scatter/gather case. 2707 */ 2708 qc->nbytes = scmd->request_bufflen; 2709 2710 /* request result TF */ 2711 qc->flags |= ATA_QCFLAG_RESULT_TF; 2712 2713 return 0; 2714 2715 invalid_fld: 2716 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2717 /* "Invalid field in cdb" */ 2718 return 1; 2719 } 2720 2721 /** 2722 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2723 * @dev: ATA device 2724 * @cmd: SCSI command opcode to consider 2725 * 2726 * Look up the SCSI command given, and determine whether the 2727 * SCSI command is to be translated or simulated. 2728 * 2729 * RETURNS: 2730 * Pointer to translation function if possible, %NULL if not. 2731 */ 2732 2733 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2734 { 2735 switch (cmd) { 2736 case READ_6: 2737 case READ_10: 2738 case READ_16: 2739 2740 case WRITE_6: 2741 case WRITE_10: 2742 case WRITE_16: 2743 return ata_scsi_rw_xlat; 2744 2745 case SYNCHRONIZE_CACHE: 2746 if (ata_try_flush_cache(dev)) 2747 return ata_scsi_flush_xlat; 2748 break; 2749 2750 case VERIFY: 2751 case VERIFY_16: 2752 return ata_scsi_verify_xlat; 2753 2754 case ATA_12: 2755 case ATA_16: 2756 return ata_scsi_pass_thru; 2757 2758 case START_STOP: 2759 return ata_scsi_start_stop_xlat; 2760 } 2761 2762 return NULL; 2763 } 2764 2765 /** 2766 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2767 * @ap: ATA port to which the command was being sent 2768 * @cmd: SCSI command to dump 2769 * 2770 * Prints the contents of a SCSI command via printk(). 2771 */ 2772 2773 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2774 struct scsi_cmnd *cmd) 2775 { 2776 #ifdef ATA_DEBUG 2777 struct scsi_device *scsidev = cmd->device; 2778 u8 *scsicmd = cmd->cmnd; 2779 2780 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2781 ap->print_id, 2782 scsidev->channel, scsidev->id, scsidev->lun, 2783 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2784 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2785 scsicmd[8]); 2786 #endif 2787 } 2788 2789 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 2790 void (*done)(struct scsi_cmnd *), 2791 struct ata_device *dev) 2792 { 2793 int rc = 0; 2794 2795 if (unlikely(!scmd->cmd_len)) { 2796 ata_dev_printk(dev, KERN_WARNING, "WARNING: zero len CDB\n"); 2797 scmd->result = DID_ERROR << 16; 2798 done(scmd); 2799 return 0; 2800 } 2801 2802 if (dev->class == ATA_DEV_ATA) { 2803 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev, 2804 scmd->cmnd[0]); 2805 2806 if (xlat_func) 2807 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 2808 else 2809 ata_scsi_simulate(dev, scmd, done); 2810 } else 2811 rc = ata_scsi_translate(dev, scmd, done, atapi_xlat); 2812 2813 return rc; 2814 } 2815 2816 /** 2817 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 2818 * @cmd: SCSI command to be sent 2819 * @done: Completion function, called when command is complete 2820 * 2821 * In some cases, this function translates SCSI commands into 2822 * ATA taskfiles, and queues the taskfiles to be sent to 2823 * hardware. In other cases, this function simulates a 2824 * SCSI device by evaluating and responding to certain 2825 * SCSI commands. This creates the overall effect of 2826 * ATA and ATAPI devices appearing as SCSI devices. 2827 * 2828 * LOCKING: 2829 * Releases scsi-layer-held lock, and obtains host lock. 2830 * 2831 * RETURNS: 2832 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 2833 * 0 otherwise. 2834 */ 2835 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2836 { 2837 struct ata_port *ap; 2838 struct ata_device *dev; 2839 struct scsi_device *scsidev = cmd->device; 2840 struct Scsi_Host *shost = scsidev->host; 2841 int rc = 0; 2842 2843 ap = ata_shost_to_port(shost); 2844 2845 spin_unlock(shost->host_lock); 2846 spin_lock(ap->lock); 2847 2848 ata_scsi_dump_cdb(ap, cmd); 2849 2850 dev = ata_scsi_find_dev(ap, scsidev); 2851 if (likely(dev)) 2852 rc = __ata_scsi_queuecmd(cmd, done, dev); 2853 else { 2854 cmd->result = (DID_BAD_TARGET << 16); 2855 done(cmd); 2856 } 2857 2858 spin_unlock(ap->lock); 2859 spin_lock(shost->host_lock); 2860 return rc; 2861 } 2862 2863 /** 2864 * ata_scsi_simulate - simulate SCSI command on ATA device 2865 * @dev: the target device 2866 * @cmd: SCSI command being sent to device. 2867 * @done: SCSI command completion function. 2868 * 2869 * Interprets and directly executes a select list of SCSI commands 2870 * that can be handled internally. 2871 * 2872 * LOCKING: 2873 * spin_lock_irqsave(host lock) 2874 */ 2875 2876 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 2877 void (*done)(struct scsi_cmnd *)) 2878 { 2879 struct ata_scsi_args args; 2880 const u8 *scsicmd = cmd->cmnd; 2881 2882 args.dev = dev; 2883 args.id = dev->id; 2884 args.cmd = cmd; 2885 args.done = done; 2886 2887 switch(scsicmd[0]) { 2888 /* no-op's, complete with success */ 2889 case SYNCHRONIZE_CACHE: 2890 case REZERO_UNIT: 2891 case SEEK_6: 2892 case SEEK_10: 2893 case TEST_UNIT_READY: 2894 case FORMAT_UNIT: /* FIXME: correct? */ 2895 case SEND_DIAGNOSTIC: /* FIXME: correct? */ 2896 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 2897 break; 2898 2899 case INQUIRY: 2900 if (scsicmd[1] & 2) /* is CmdDt set? */ 2901 ata_scsi_invalid_field(cmd, done); 2902 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 2903 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 2904 else if (scsicmd[2] == 0x00) 2905 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 2906 else if (scsicmd[2] == 0x80) 2907 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 2908 else if (scsicmd[2] == 0x83) 2909 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 2910 else 2911 ata_scsi_invalid_field(cmd, done); 2912 break; 2913 2914 case MODE_SENSE: 2915 case MODE_SENSE_10: 2916 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 2917 break; 2918 2919 case MODE_SELECT: /* unconditionally return */ 2920 case MODE_SELECT_10: /* bad-field-in-cdb */ 2921 ata_scsi_invalid_field(cmd, done); 2922 break; 2923 2924 case READ_CAPACITY: 2925 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2926 break; 2927 2928 case SERVICE_ACTION_IN: 2929 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 2930 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2931 else 2932 ata_scsi_invalid_field(cmd, done); 2933 break; 2934 2935 case REPORT_LUNS: 2936 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 2937 break; 2938 2939 /* mandatory commands we haven't implemented yet */ 2940 case REQUEST_SENSE: 2941 2942 /* all other commands */ 2943 default: 2944 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 2945 /* "Invalid command operation code" */ 2946 done(cmd); 2947 break; 2948 } 2949 } 2950 2951 void ata_scsi_scan_host(struct ata_port *ap) 2952 { 2953 unsigned int i; 2954 2955 if (ap->flags & ATA_FLAG_DISABLED) 2956 return; 2957 2958 for (i = 0; i < ATA_MAX_DEVICES; i++) { 2959 struct ata_device *dev = &ap->device[i]; 2960 struct scsi_device *sdev; 2961 2962 if (!ata_dev_enabled(dev) || dev->sdev) 2963 continue; 2964 2965 sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL); 2966 if (!IS_ERR(sdev)) { 2967 dev->sdev = sdev; 2968 scsi_device_put(sdev); 2969 } 2970 } 2971 } 2972 2973 /** 2974 * ata_scsi_offline_dev - offline attached SCSI device 2975 * @dev: ATA device to offline attached SCSI device for 2976 * 2977 * This function is called from ata_eh_hotplug() and responsible 2978 * for taking the SCSI device attached to @dev offline. This 2979 * function is called with host lock which protects dev->sdev 2980 * against clearing. 2981 * 2982 * LOCKING: 2983 * spin_lock_irqsave(host lock) 2984 * 2985 * RETURNS: 2986 * 1 if attached SCSI device exists, 0 otherwise. 2987 */ 2988 int ata_scsi_offline_dev(struct ata_device *dev) 2989 { 2990 if (dev->sdev) { 2991 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 2992 return 1; 2993 } 2994 return 0; 2995 } 2996 2997 /** 2998 * ata_scsi_remove_dev - remove attached SCSI device 2999 * @dev: ATA device to remove attached SCSI device for 3000 * 3001 * This function is called from ata_eh_scsi_hotplug() and 3002 * responsible for removing the SCSI device attached to @dev. 3003 * 3004 * LOCKING: 3005 * Kernel thread context (may sleep). 3006 */ 3007 static void ata_scsi_remove_dev(struct ata_device *dev) 3008 { 3009 struct ata_port *ap = dev->ap; 3010 struct scsi_device *sdev; 3011 unsigned long flags; 3012 3013 /* Alas, we need to grab scan_mutex to ensure SCSI device 3014 * state doesn't change underneath us and thus 3015 * scsi_device_get() always succeeds. The mutex locking can 3016 * be removed if there is __scsi_device_get() interface which 3017 * increments reference counts regardless of device state. 3018 */ 3019 mutex_lock(&ap->scsi_host->scan_mutex); 3020 spin_lock_irqsave(ap->lock, flags); 3021 3022 /* clearing dev->sdev is protected by host lock */ 3023 sdev = dev->sdev; 3024 dev->sdev = NULL; 3025 3026 if (sdev) { 3027 /* If user initiated unplug races with us, sdev can go 3028 * away underneath us after the host lock and 3029 * scan_mutex are released. Hold onto it. 3030 */ 3031 if (scsi_device_get(sdev) == 0) { 3032 /* The following ensures the attached sdev is 3033 * offline on return from ata_scsi_offline_dev() 3034 * regardless it wins or loses the race 3035 * against this function. 3036 */ 3037 scsi_device_set_state(sdev, SDEV_OFFLINE); 3038 } else { 3039 WARN_ON(1); 3040 sdev = NULL; 3041 } 3042 } 3043 3044 spin_unlock_irqrestore(ap->lock, flags); 3045 mutex_unlock(&ap->scsi_host->scan_mutex); 3046 3047 if (sdev) { 3048 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3049 sdev->sdev_gendev.bus_id); 3050 3051 scsi_remove_device(sdev); 3052 scsi_device_put(sdev); 3053 } 3054 } 3055 3056 /** 3057 * ata_scsi_hotplug - SCSI part of hotplug 3058 * @work: Pointer to ATA port to perform SCSI hotplug on 3059 * 3060 * Perform SCSI part of hotplug. It's executed from a separate 3061 * workqueue after EH completes. This is necessary because SCSI 3062 * hot plugging requires working EH and hot unplugging is 3063 * synchronized with hot plugging with a mutex. 3064 * 3065 * LOCKING: 3066 * Kernel thread context (may sleep). 3067 */ 3068 void ata_scsi_hotplug(struct work_struct *work) 3069 { 3070 struct ata_port *ap = 3071 container_of(work, struct ata_port, hotplug_task.work); 3072 int i; 3073 3074 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3075 DPRINTK("ENTER/EXIT - unloading\n"); 3076 return; 3077 } 3078 3079 DPRINTK("ENTER\n"); 3080 3081 /* unplug detached devices */ 3082 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3083 struct ata_device *dev = &ap->device[i]; 3084 unsigned long flags; 3085 3086 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3087 continue; 3088 3089 spin_lock_irqsave(ap->lock, flags); 3090 dev->flags &= ~ATA_DFLAG_DETACHED; 3091 spin_unlock_irqrestore(ap->lock, flags); 3092 3093 ata_scsi_remove_dev(dev); 3094 } 3095 3096 /* scan for new ones */ 3097 ata_scsi_scan_host(ap); 3098 3099 /* If we scanned while EH was in progress, scan would have 3100 * failed silently. Requeue if there are enabled but 3101 * unattached devices. 3102 */ 3103 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3104 struct ata_device *dev = &ap->device[i]; 3105 if (ata_dev_enabled(dev) && !dev->sdev) { 3106 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3107 round_jiffies_relative(HZ)); 3108 break; 3109 } 3110 } 3111 3112 DPRINTK("EXIT\n"); 3113 } 3114 3115 /** 3116 * ata_scsi_user_scan - indication for user-initiated bus scan 3117 * @shost: SCSI host to scan 3118 * @channel: Channel to scan 3119 * @id: ID to scan 3120 * @lun: LUN to scan 3121 * 3122 * This function is called when user explicitly requests bus 3123 * scan. Set probe pending flag and invoke EH. 3124 * 3125 * LOCKING: 3126 * SCSI layer (we don't care) 3127 * 3128 * RETURNS: 3129 * Zero. 3130 */ 3131 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3132 unsigned int id, unsigned int lun) 3133 { 3134 struct ata_port *ap = ata_shost_to_port(shost); 3135 unsigned long flags; 3136 int rc = 0; 3137 3138 if (!ap->ops->error_handler) 3139 return -EOPNOTSUPP; 3140 3141 if ((channel != SCAN_WILD_CARD && channel != 0) || 3142 (lun != SCAN_WILD_CARD && lun != 0)) 3143 return -EINVAL; 3144 3145 spin_lock_irqsave(ap->lock, flags); 3146 3147 if (id == SCAN_WILD_CARD) { 3148 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1; 3149 ap->eh_info.action |= ATA_EH_SOFTRESET; 3150 } else { 3151 struct ata_device *dev = ata_find_dev(ap, id); 3152 3153 if (dev) { 3154 ap->eh_info.probe_mask |= 1 << dev->devno; 3155 ap->eh_info.action |= ATA_EH_SOFTRESET; 3156 ap->eh_info.flags |= ATA_EHI_RESUME_LINK; 3157 } else 3158 rc = -EINVAL; 3159 } 3160 3161 if (rc == 0) { 3162 ata_port_schedule_eh(ap); 3163 spin_unlock_irqrestore(ap->lock, flags); 3164 ata_port_wait_eh(ap); 3165 } else 3166 spin_unlock_irqrestore(ap->lock, flags); 3167 3168 return rc; 3169 } 3170 3171 /** 3172 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3173 * @work: Pointer to ATA port to perform scsi_rescan_device() 3174 * 3175 * After ATA pass thru (SAT) commands are executed successfully, 3176 * libata need to propagate the changes to SCSI layer. This 3177 * function must be executed from ata_aux_wq such that sdev 3178 * attach/detach don't race with rescan. 3179 * 3180 * LOCKING: 3181 * Kernel thread context (may sleep). 3182 */ 3183 void ata_scsi_dev_rescan(struct work_struct *work) 3184 { 3185 struct ata_port *ap = 3186 container_of(work, struct ata_port, scsi_rescan_task); 3187 unsigned long flags; 3188 unsigned int i; 3189 3190 spin_lock_irqsave(ap->lock, flags); 3191 3192 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3193 struct ata_device *dev = &ap->device[i]; 3194 struct scsi_device *sdev = dev->sdev; 3195 3196 if (!ata_dev_enabled(dev) || !sdev) 3197 continue; 3198 if (scsi_device_get(sdev)) 3199 continue; 3200 3201 spin_unlock_irqrestore(ap->lock, flags); 3202 scsi_rescan_device(&(sdev->sdev_gendev)); 3203 scsi_device_put(sdev); 3204 spin_lock_irqsave(ap->lock, flags); 3205 } 3206 3207 spin_unlock_irqrestore(ap->lock, flags); 3208 } 3209 3210 /** 3211 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3212 * @host: ATA host container for all SAS ports 3213 * @port_info: Information from low-level host driver 3214 * @shost: SCSI host that the scsi device is attached to 3215 * 3216 * LOCKING: 3217 * PCI/etc. bus probe sem. 3218 * 3219 * RETURNS: 3220 * ata_port pointer on success / NULL on failure. 3221 */ 3222 3223 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3224 struct ata_port_info *port_info, 3225 struct Scsi_Host *shost) 3226 { 3227 struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL); 3228 struct ata_probe_ent *ent; 3229 3230 if (!ap) 3231 return NULL; 3232 3233 ent = ata_probe_ent_alloc(host->dev, port_info); 3234 if (!ent) { 3235 kfree(ap); 3236 return NULL; 3237 } 3238 3239 ata_port_init(ap, host, ent, 0); 3240 ap->lock = shost->host_lock; 3241 devm_kfree(host->dev, ent); 3242 return ap; 3243 } 3244 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3245 3246 /** 3247 * ata_sas_port_start - Set port up for dma. 3248 * @ap: Port to initialize 3249 * 3250 * Called just after data structures for each port are 3251 * initialized. Allocates DMA pad. 3252 * 3253 * May be used as the port_start() entry in ata_port_operations. 3254 * 3255 * LOCKING: 3256 * Inherited from caller. 3257 */ 3258 int ata_sas_port_start(struct ata_port *ap) 3259 { 3260 return ata_pad_alloc(ap, ap->dev); 3261 } 3262 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3263 3264 /** 3265 * ata_port_stop - Undo ata_sas_port_start() 3266 * @ap: Port to shut down 3267 * 3268 * Frees the DMA pad. 3269 * 3270 * May be used as the port_stop() entry in ata_port_operations. 3271 * 3272 * LOCKING: 3273 * Inherited from caller. 3274 */ 3275 3276 void ata_sas_port_stop(struct ata_port *ap) 3277 { 3278 ata_pad_free(ap, ap->dev); 3279 } 3280 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3281 3282 /** 3283 * ata_sas_port_init - Initialize a SATA device 3284 * @ap: SATA port to initialize 3285 * 3286 * LOCKING: 3287 * PCI/etc. bus probe sem. 3288 * 3289 * RETURNS: 3290 * Zero on success, non-zero on error. 3291 */ 3292 3293 int ata_sas_port_init(struct ata_port *ap) 3294 { 3295 int rc = ap->ops->port_start(ap); 3296 3297 if (!rc) 3298 rc = ata_bus_probe(ap); 3299 3300 return rc; 3301 } 3302 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3303 3304 /** 3305 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3306 * @ap: SATA port to destroy 3307 * 3308 */ 3309 3310 void ata_sas_port_destroy(struct ata_port *ap) 3311 { 3312 if (ap->ops->port_stop) 3313 ap->ops->port_stop(ap); 3314 kfree(ap); 3315 } 3316 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3317 3318 /** 3319 * ata_sas_slave_configure - Default slave_config routine for libata devices 3320 * @sdev: SCSI device to configure 3321 * @ap: ATA port to which SCSI device is attached 3322 * 3323 * RETURNS: 3324 * Zero. 3325 */ 3326 3327 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3328 { 3329 ata_scsi_sdev_config(sdev); 3330 ata_scsi_dev_config(sdev, ap->device); 3331 return 0; 3332 } 3333 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3334 3335 /** 3336 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3337 * @cmd: SCSI command to be sent 3338 * @done: Completion function, called when command is complete 3339 * @ap: ATA port to which the command is being sent 3340 * 3341 * RETURNS: 3342 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3343 * 0 otherwise. 3344 */ 3345 3346 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3347 struct ata_port *ap) 3348 { 3349 int rc = 0; 3350 3351 ata_scsi_dump_cdb(ap, cmd); 3352 3353 if (likely(ata_scsi_dev_enabled(ap->device))) 3354 rc = __ata_scsi_queuecmd(cmd, done, ap->device); 3355 else { 3356 cmd->result = (DID_BAD_TARGET << 16); 3357 done(cmd); 3358 } 3359 return rc; 3360 } 3361 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3362