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 static 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] & 0x4f; 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 /** 514 * ata_to_sense_error - convert ATA error to SCSI error 515 * @id: ATA device number 516 * @drv_stat: value contained in ATA status register 517 * @drv_err: value contained in ATA error register 518 * @sk: the sense key we'll fill out 519 * @asc: the additional sense code we'll fill out 520 * @ascq: the additional sense code qualifier we'll fill out 521 * @verbose: be verbose 522 * 523 * Converts an ATA error into a SCSI error. Fill out pointers to 524 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor 525 * format sense blocks. 526 * 527 * LOCKING: 528 * spin_lock_irqsave(host lock) 529 */ 530 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, 531 u8 *asc, u8 *ascq, int verbose) 532 { 533 int i; 534 535 /* Based on the 3ware driver translation table */ 536 static const unsigned char sense_table[][4] = { 537 /* BBD|ECC|ID|MAR */ 538 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 539 /* BBD|ECC|ID */ 540 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command 541 /* ECC|MC|MARK */ 542 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error 543 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ 544 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error 545 /* MC|ID|ABRT|TRK0|MARK */ 546 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready 547 /* MCR|MARK */ 548 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready 549 /* Bad address mark */ 550 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field 551 /* TRK0 */ 552 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error 553 /* Abort & !ICRC */ 554 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command 555 /* Media change request */ 556 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline 557 /* SRV */ 558 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found 559 /* Media change */ 560 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline 561 /* ECC */ 562 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error 563 /* BBD - block marked bad */ 564 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error 565 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 566 }; 567 static const unsigned char stat_table[][4] = { 568 /* Must be first because BUSY means no other bits valid */ 569 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now 570 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault 571 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now 572 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered 573 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark 574 }; 575 576 /* 577 * Is this an error we can process/parse 578 */ 579 if (drv_stat & ATA_BUSY) { 580 drv_err = 0; /* Ignore the err bits, they're invalid */ 581 } 582 583 if (drv_err) { 584 /* Look for drv_err */ 585 for (i = 0; sense_table[i][0] != 0xFF; i++) { 586 /* Look for best matches first */ 587 if ((sense_table[i][0] & drv_err) == 588 sense_table[i][0]) { 589 *sk = sense_table[i][1]; 590 *asc = sense_table[i][2]; 591 *ascq = sense_table[i][3]; 592 goto translate_done; 593 } 594 } 595 /* No immediate match */ 596 if (verbose) 597 printk(KERN_WARNING "ata%u: no sense translation for " 598 "error 0x%02x\n", id, drv_err); 599 } 600 601 /* Fall back to interpreting status bits */ 602 for (i = 0; stat_table[i][0] != 0xFF; i++) { 603 if (stat_table[i][0] & drv_stat) { 604 *sk = stat_table[i][1]; 605 *asc = stat_table[i][2]; 606 *ascq = stat_table[i][3]; 607 goto translate_done; 608 } 609 } 610 /* No error? Undecoded? */ 611 if (verbose) 612 printk(KERN_WARNING "ata%u: no sense translation for " 613 "status: 0x%02x\n", id, drv_stat); 614 615 /* We need a sensible error return here, which is tricky, and one 616 that won't cause people to do things like return a disk wrongly */ 617 *sk = ABORTED_COMMAND; 618 *asc = 0x00; 619 *ascq = 0x00; 620 621 translate_done: 622 if (verbose) 623 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x " 624 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", 625 id, drv_stat, drv_err, *sk, *asc, *ascq); 626 return; 627 } 628 629 /* 630 * ata_gen_passthru_sense - Generate check condition sense block. 631 * @qc: Command that completed. 632 * 633 * This function is specific to the ATA descriptor format sense 634 * block specified for the ATA pass through commands. Regardless 635 * of whether the command errored or not, return a sense 636 * block. Copy all controller registers into the sense 637 * block. Clear sense key, ASC & ASCQ if there is no error. 638 * 639 * LOCKING: 640 * None. 641 */ 642 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) 643 { 644 struct scsi_cmnd *cmd = qc->scsicmd; 645 struct ata_taskfile *tf = &qc->result_tf; 646 unsigned char *sb = cmd->sense_buffer; 647 unsigned char *desc = sb + 8; 648 int verbose = qc->ap->ops->error_handler == NULL; 649 650 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 651 652 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 653 654 /* 655 * Use ata_to_sense_error() to map status register bits 656 * onto sense key, asc & ascq. 657 */ 658 if (qc->err_mask || 659 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 660 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 661 &sb[1], &sb[2], &sb[3], verbose); 662 sb[1] &= 0x0f; 663 } 664 665 /* 666 * Sense data is current and format is descriptor. 667 */ 668 sb[0] = 0x72; 669 670 desc[0] = 0x09; 671 672 /* set length of additional sense data */ 673 sb[7] = 14; 674 desc[1] = 12; 675 676 /* 677 * Copy registers into sense buffer. 678 */ 679 desc[2] = 0x00; 680 desc[3] = tf->feature; /* == error reg */ 681 desc[5] = tf->nsect; 682 desc[7] = tf->lbal; 683 desc[9] = tf->lbam; 684 desc[11] = tf->lbah; 685 desc[12] = tf->device; 686 desc[13] = tf->command; /* == status reg */ 687 688 /* 689 * Fill in Extend bit, and the high order bytes 690 * if applicable. 691 */ 692 if (tf->flags & ATA_TFLAG_LBA48) { 693 desc[2] |= 0x01; 694 desc[4] = tf->hob_nsect; 695 desc[6] = tf->hob_lbal; 696 desc[8] = tf->hob_lbam; 697 desc[10] = tf->hob_lbah; 698 } 699 } 700 701 /** 702 * ata_gen_ata_sense - generate a SCSI fixed sense block 703 * @qc: Command that we are erroring out 704 * 705 * Generate sense block for a failed ATA command @qc. Descriptor 706 * format is used to accomodate LBA48 block address. 707 * 708 * LOCKING: 709 * None. 710 */ 711 static void ata_gen_ata_sense(struct ata_queued_cmd *qc) 712 { 713 struct ata_device *dev = qc->dev; 714 struct scsi_cmnd *cmd = qc->scsicmd; 715 struct ata_taskfile *tf = &qc->result_tf; 716 unsigned char *sb = cmd->sense_buffer; 717 unsigned char *desc = sb + 8; 718 int verbose = qc->ap->ops->error_handler == NULL; 719 u64 block; 720 721 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 722 723 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 724 725 /* sense data is current and format is descriptor */ 726 sb[0] = 0x72; 727 728 /* Use ata_to_sense_error() to map status register bits 729 * onto sense key, asc & ascq. 730 */ 731 if (qc->err_mask || 732 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { 733 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature, 734 &sb[1], &sb[2], &sb[3], verbose); 735 sb[1] &= 0x0f; 736 } 737 738 block = ata_tf_read_block(&qc->result_tf, dev); 739 740 /* information sense data descriptor */ 741 sb[7] = 12; 742 desc[0] = 0x00; 743 desc[1] = 10; 744 745 desc[2] |= 0x80; /* valid */ 746 desc[6] = block >> 40; 747 desc[7] = block >> 32; 748 desc[8] = block >> 24; 749 desc[9] = block >> 16; 750 desc[10] = block >> 8; 751 desc[11] = block; 752 } 753 754 static void ata_scsi_sdev_config(struct scsi_device *sdev) 755 { 756 sdev->use_10_for_rw = 1; 757 sdev->use_10_for_ms = 1; 758 } 759 760 static void ata_scsi_dev_config(struct scsi_device *sdev, 761 struct ata_device *dev) 762 { 763 /* configure max sectors */ 764 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); 765 766 /* SATA DMA transfers must be multiples of 4 byte, so 767 * we need to pad ATAPI transfers using an extra sg. 768 * Decrement max hw segments accordingly. 769 */ 770 if (dev->class == ATA_DEV_ATAPI) { 771 request_queue_t *q = sdev->request_queue; 772 blk_queue_max_hw_segments(q, q->max_hw_segments - 1); 773 } 774 775 if (dev->flags & ATA_DFLAG_NCQ) { 776 int depth; 777 778 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); 779 depth = min(ATA_MAX_QUEUE - 1, depth); 780 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 781 } 782 } 783 784 /** 785 * ata_scsi_slave_config - Set SCSI device attributes 786 * @sdev: SCSI device to examine 787 * 788 * This is called before we actually start reading 789 * and writing to the device, to configure certain 790 * SCSI mid-layer behaviors. 791 * 792 * LOCKING: 793 * Defined by SCSI layer. We don't really care. 794 */ 795 796 int ata_scsi_slave_config(struct scsi_device *sdev) 797 { 798 struct ata_port *ap = ata_shost_to_port(sdev->host); 799 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); 800 801 ata_scsi_sdev_config(sdev); 802 803 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD); 804 805 sdev->manage_start_stop = 1; 806 807 if (dev) 808 ata_scsi_dev_config(sdev, dev); 809 810 return 0; /* scsi layer doesn't check return value, sigh */ 811 } 812 813 /** 814 * ata_scsi_slave_destroy - SCSI device is about to be destroyed 815 * @sdev: SCSI device to be destroyed 816 * 817 * @sdev is about to be destroyed for hot/warm unplugging. If 818 * this unplugging was initiated by libata as indicated by NULL 819 * dev->sdev, this function doesn't have to do anything. 820 * Otherwise, SCSI layer initiated warm-unplug is in progress. 821 * Clear dev->sdev, schedule the device for ATA detach and invoke 822 * EH. 823 * 824 * LOCKING: 825 * Defined by SCSI layer. We don't really care. 826 */ 827 void ata_scsi_slave_destroy(struct scsi_device *sdev) 828 { 829 struct ata_port *ap = ata_shost_to_port(sdev->host); 830 unsigned long flags; 831 struct ata_device *dev; 832 833 if (!ap->ops->error_handler) 834 return; 835 836 spin_lock_irqsave(ap->lock, flags); 837 dev = __ata_scsi_find_dev(ap, sdev); 838 if (dev && dev->sdev) { 839 /* SCSI device already in CANCEL state, no need to offline it */ 840 dev->sdev = NULL; 841 dev->flags |= ATA_DFLAG_DETACH; 842 ata_port_schedule_eh(ap); 843 } 844 spin_unlock_irqrestore(ap->lock, flags); 845 } 846 847 /** 848 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 849 * @sdev: SCSI device to configure queue depth for 850 * @queue_depth: new queue depth 851 * 852 * This is libata standard hostt->change_queue_depth callback. 853 * SCSI will call into this callback when user tries to set queue 854 * depth via sysfs. 855 * 856 * LOCKING: 857 * SCSI layer (we don't care) 858 * 859 * RETURNS: 860 * Newly configured queue depth. 861 */ 862 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 863 { 864 struct ata_port *ap = ata_shost_to_port(sdev->host); 865 struct ata_device *dev; 866 unsigned long flags; 867 868 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 869 return sdev->queue_depth; 870 871 dev = ata_scsi_find_dev(ap, sdev); 872 if (!dev || !ata_dev_enabled(dev)) 873 return sdev->queue_depth; 874 875 /* NCQ enabled? */ 876 spin_lock_irqsave(ap->lock, flags); 877 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 878 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 879 dev->flags |= ATA_DFLAG_NCQ_OFF; 880 queue_depth = 1; 881 } 882 spin_unlock_irqrestore(ap->lock, flags); 883 884 /* limit and apply queue depth */ 885 queue_depth = min(queue_depth, sdev->host->can_queue); 886 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 887 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1); 888 889 if (sdev->queue_depth == queue_depth) 890 return -EINVAL; 891 892 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth); 893 return queue_depth; 894 } 895 896 /* XXX: for spindown warning */ 897 static void ata_delayed_done_timerfn(unsigned long arg) 898 { 899 struct scsi_cmnd *scmd = (void *)arg; 900 901 scmd->scsi_done(scmd); 902 } 903 904 /* XXX: for spindown warning */ 905 static void ata_delayed_done(struct scsi_cmnd *scmd) 906 { 907 static struct timer_list timer; 908 909 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd); 910 mod_timer(&timer, jiffies + 5 * HZ); 911 } 912 913 /** 914 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command 915 * @qc: Storage for translated ATA taskfile 916 * 917 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY 918 * (to start). Perhaps these commands should be preceded by 919 * CHECK POWER MODE to see what power mode the device is already in. 920 * [See SAT revision 5 at www.t10.org] 921 * 922 * LOCKING: 923 * spin_lock_irqsave(host lock) 924 * 925 * RETURNS: 926 * Zero on success, non-zero on error. 927 */ 928 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc) 929 { 930 struct scsi_cmnd *scmd = qc->scsicmd; 931 struct ata_taskfile *tf = &qc->tf; 932 const u8 *cdb = scmd->cmnd; 933 934 if (scmd->cmd_len < 5) 935 goto invalid_fld; 936 937 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 938 tf->protocol = ATA_PROT_NODATA; 939 if (cdb[1] & 0x1) { 940 ; /* ignore IMMED bit, violates sat-r05 */ 941 } 942 if (cdb[4] & 0x2) 943 goto invalid_fld; /* LOEJ bit set not supported */ 944 if (((cdb[4] >> 4) & 0xf) != 0) 945 goto invalid_fld; /* power conditions not supported */ 946 if (cdb[4] & 0x1) { 947 tf->nsect = 1; /* 1 sector, lba=0 */ 948 949 if (qc->dev->flags & ATA_DFLAG_LBA) { 950 tf->flags |= ATA_TFLAG_LBA; 951 952 tf->lbah = 0x0; 953 tf->lbam = 0x0; 954 tf->lbal = 0x0; 955 tf->device |= ATA_LBA; 956 } else { 957 /* CHS */ 958 tf->lbal = 0x1; /* sect */ 959 tf->lbam = 0x0; /* cyl low */ 960 tf->lbah = 0x0; /* cyl high */ 961 } 962 963 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */ 964 } else { 965 /* XXX: This is for backward compatibility, will be 966 * removed. Read Documentation/feature-removal-schedule.txt 967 * for more info. 968 */ 969 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) && 970 (system_state == SYSTEM_HALT || 971 system_state == SYSTEM_POWER_OFF)) { 972 static unsigned long warned = 0; 973 974 if (!test_and_set_bit(0, &warned)) { 975 ata_dev_printk(qc->dev, KERN_WARNING, 976 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. " 977 "UPDATE SHUTDOWN UTILITY\n"); 978 ata_dev_printk(qc->dev, KERN_WARNING, 979 "For more info, visit " 980 "http://linux-ata.org/shutdown.html\n"); 981 982 /* ->scsi_done is not used, use it for 983 * delayed completion. 984 */ 985 scmd->scsi_done = qc->scsidone; 986 qc->scsidone = ata_delayed_done; 987 } 988 scmd->result = SAM_STAT_GOOD; 989 return 1; 990 } 991 992 /* Issue ATA STANDBY IMMEDIATE command */ 993 tf->command = ATA_CMD_STANDBYNOW1; 994 } 995 996 /* 997 * Standby and Idle condition timers could be implemented but that 998 * would require libata to implement the Power condition mode page 999 * and allow the user to change it. Changing mode pages requires 1000 * MODE SELECT to be implemented. 1001 */ 1002 1003 return 0; 1004 1005 invalid_fld: 1006 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1007 /* "Invalid field in cbd" */ 1008 return 1; 1009 } 1010 1011 1012 /** 1013 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command 1014 * @qc: Storage for translated ATA taskfile 1015 * 1016 * Sets up an ATA taskfile to issue FLUSH CACHE or 1017 * FLUSH CACHE EXT. 1018 * 1019 * LOCKING: 1020 * spin_lock_irqsave(host lock) 1021 * 1022 * RETURNS: 1023 * Zero on success, non-zero on error. 1024 */ 1025 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc) 1026 { 1027 struct ata_taskfile *tf = &qc->tf; 1028 1029 tf->flags |= ATA_TFLAG_DEVICE; 1030 tf->protocol = ATA_PROT_NODATA; 1031 1032 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT) 1033 tf->command = ATA_CMD_FLUSH_EXT; 1034 else 1035 tf->command = ATA_CMD_FLUSH; 1036 1037 return 0; 1038 } 1039 1040 /** 1041 * scsi_6_lba_len - Get LBA and transfer length 1042 * @cdb: SCSI command to translate 1043 * 1044 * Calculate LBA and transfer length for 6-byte commands. 1045 * 1046 * RETURNS: 1047 * @plba: the LBA 1048 * @plen: the transfer length 1049 */ 1050 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1051 { 1052 u64 lba = 0; 1053 u32 len; 1054 1055 VPRINTK("six-byte command\n"); 1056 1057 lba |= ((u64)(cdb[1] & 0x1f)) << 16; 1058 lba |= ((u64)cdb[2]) << 8; 1059 lba |= ((u64)cdb[3]); 1060 1061 len = cdb[4]; 1062 1063 *plba = lba; 1064 *plen = len; 1065 } 1066 1067 /** 1068 * scsi_10_lba_len - Get LBA and transfer length 1069 * @cdb: SCSI command to translate 1070 * 1071 * Calculate LBA and transfer length for 10-byte commands. 1072 * 1073 * RETURNS: 1074 * @plba: the LBA 1075 * @plen: the transfer length 1076 */ 1077 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1078 { 1079 u64 lba = 0; 1080 u32 len = 0; 1081 1082 VPRINTK("ten-byte command\n"); 1083 1084 lba |= ((u64)cdb[2]) << 24; 1085 lba |= ((u64)cdb[3]) << 16; 1086 lba |= ((u64)cdb[4]) << 8; 1087 lba |= ((u64)cdb[5]); 1088 1089 len |= ((u32)cdb[7]) << 8; 1090 len |= ((u32)cdb[8]); 1091 1092 *plba = lba; 1093 *plen = len; 1094 } 1095 1096 /** 1097 * scsi_16_lba_len - Get LBA and transfer length 1098 * @cdb: SCSI command to translate 1099 * 1100 * Calculate LBA and transfer length for 16-byte commands. 1101 * 1102 * RETURNS: 1103 * @plba: the LBA 1104 * @plen: the transfer length 1105 */ 1106 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen) 1107 { 1108 u64 lba = 0; 1109 u32 len = 0; 1110 1111 VPRINTK("sixteen-byte command\n"); 1112 1113 lba |= ((u64)cdb[2]) << 56; 1114 lba |= ((u64)cdb[3]) << 48; 1115 lba |= ((u64)cdb[4]) << 40; 1116 lba |= ((u64)cdb[5]) << 32; 1117 lba |= ((u64)cdb[6]) << 24; 1118 lba |= ((u64)cdb[7]) << 16; 1119 lba |= ((u64)cdb[8]) << 8; 1120 lba |= ((u64)cdb[9]); 1121 1122 len |= ((u32)cdb[10]) << 24; 1123 len |= ((u32)cdb[11]) << 16; 1124 len |= ((u32)cdb[12]) << 8; 1125 len |= ((u32)cdb[13]); 1126 1127 *plba = lba; 1128 *plen = len; 1129 } 1130 1131 /** 1132 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one 1133 * @qc: Storage for translated ATA taskfile 1134 * 1135 * Converts SCSI VERIFY command to an ATA READ VERIFY command. 1136 * 1137 * LOCKING: 1138 * spin_lock_irqsave(host lock) 1139 * 1140 * RETURNS: 1141 * Zero on success, non-zero on error. 1142 */ 1143 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) 1144 { 1145 struct scsi_cmnd *scmd = qc->scsicmd; 1146 struct ata_taskfile *tf = &qc->tf; 1147 struct ata_device *dev = qc->dev; 1148 u64 dev_sectors = qc->dev->n_sectors; 1149 const u8 *cdb = scmd->cmnd; 1150 u64 block; 1151 u32 n_block; 1152 1153 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 1154 tf->protocol = ATA_PROT_NODATA; 1155 1156 if (cdb[0] == VERIFY) { 1157 if (scmd->cmd_len < 10) 1158 goto invalid_fld; 1159 scsi_10_lba_len(cdb, &block, &n_block); 1160 } else if (cdb[0] == VERIFY_16) { 1161 if (scmd->cmd_len < 16) 1162 goto invalid_fld; 1163 scsi_16_lba_len(cdb, &block, &n_block); 1164 } else 1165 goto invalid_fld; 1166 1167 if (!n_block) 1168 goto nothing_to_do; 1169 if (block >= dev_sectors) 1170 goto out_of_range; 1171 if ((block + n_block) > dev_sectors) 1172 goto out_of_range; 1173 1174 if (dev->flags & ATA_DFLAG_LBA) { 1175 tf->flags |= ATA_TFLAG_LBA; 1176 1177 if (lba_28_ok(block, n_block)) { 1178 /* use LBA28 */ 1179 tf->command = ATA_CMD_VERIFY; 1180 tf->device |= (block >> 24) & 0xf; 1181 } else if (lba_48_ok(block, n_block)) { 1182 if (!(dev->flags & ATA_DFLAG_LBA48)) 1183 goto out_of_range; 1184 1185 /* use LBA48 */ 1186 tf->flags |= ATA_TFLAG_LBA48; 1187 tf->command = ATA_CMD_VERIFY_EXT; 1188 1189 tf->hob_nsect = (n_block >> 8) & 0xff; 1190 1191 tf->hob_lbah = (block >> 40) & 0xff; 1192 tf->hob_lbam = (block >> 32) & 0xff; 1193 tf->hob_lbal = (block >> 24) & 0xff; 1194 } else 1195 /* request too large even for LBA48 */ 1196 goto out_of_range; 1197 1198 tf->nsect = n_block & 0xff; 1199 1200 tf->lbah = (block >> 16) & 0xff; 1201 tf->lbam = (block >> 8) & 0xff; 1202 tf->lbal = block & 0xff; 1203 1204 tf->device |= ATA_LBA; 1205 } else { 1206 /* CHS */ 1207 u32 sect, head, cyl, track; 1208 1209 if (!lba_28_ok(block, n_block)) 1210 goto out_of_range; 1211 1212 /* Convert LBA to CHS */ 1213 track = (u32)block / dev->sectors; 1214 cyl = track / dev->heads; 1215 head = track % dev->heads; 1216 sect = (u32)block % dev->sectors + 1; 1217 1218 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 1219 (u32)block, track, cyl, head, sect); 1220 1221 /* Check whether the converted CHS can fit. 1222 Cylinder: 0-65535 1223 Head: 0-15 1224 Sector: 1-255*/ 1225 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 1226 goto out_of_range; 1227 1228 tf->command = ATA_CMD_VERIFY; 1229 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 1230 tf->lbal = sect; 1231 tf->lbam = cyl; 1232 tf->lbah = cyl >> 8; 1233 tf->device |= head; 1234 } 1235 1236 return 0; 1237 1238 invalid_fld: 1239 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1240 /* "Invalid field in cbd" */ 1241 return 1; 1242 1243 out_of_range: 1244 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1245 /* "Logical Block Address out of range" */ 1246 return 1; 1247 1248 nothing_to_do: 1249 scmd->result = SAM_STAT_GOOD; 1250 return 1; 1251 } 1252 1253 /** 1254 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one 1255 * @qc: Storage for translated ATA taskfile 1256 * 1257 * Converts any of six SCSI read/write commands into the 1258 * ATA counterpart, including starting sector (LBA), 1259 * sector count, and taking into account the device's LBA48 1260 * support. 1261 * 1262 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and 1263 * %WRITE_16 are currently supported. 1264 * 1265 * LOCKING: 1266 * spin_lock_irqsave(host lock) 1267 * 1268 * RETURNS: 1269 * Zero on success, non-zero on error. 1270 */ 1271 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) 1272 { 1273 struct scsi_cmnd *scmd = qc->scsicmd; 1274 const u8 *cdb = scmd->cmnd; 1275 unsigned int tf_flags = 0; 1276 u64 block; 1277 u32 n_block; 1278 int rc; 1279 1280 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16) 1281 tf_flags |= ATA_TFLAG_WRITE; 1282 1283 /* Calculate the SCSI LBA, transfer length and FUA. */ 1284 switch (cdb[0]) { 1285 case READ_10: 1286 case WRITE_10: 1287 if (unlikely(scmd->cmd_len < 10)) 1288 goto invalid_fld; 1289 scsi_10_lba_len(cdb, &block, &n_block); 1290 if (unlikely(cdb[1] & (1 << 3))) 1291 tf_flags |= ATA_TFLAG_FUA; 1292 break; 1293 case READ_6: 1294 case WRITE_6: 1295 if (unlikely(scmd->cmd_len < 6)) 1296 goto invalid_fld; 1297 scsi_6_lba_len(cdb, &block, &n_block); 1298 1299 /* for 6-byte r/w commands, transfer length 0 1300 * means 256 blocks of data, not 0 block. 1301 */ 1302 if (!n_block) 1303 n_block = 256; 1304 break; 1305 case READ_16: 1306 case WRITE_16: 1307 if (unlikely(scmd->cmd_len < 16)) 1308 goto invalid_fld; 1309 scsi_16_lba_len(cdb, &block, &n_block); 1310 if (unlikely(cdb[1] & (1 << 3))) 1311 tf_flags |= ATA_TFLAG_FUA; 1312 break; 1313 default: 1314 DPRINTK("no-byte command\n"); 1315 goto invalid_fld; 1316 } 1317 1318 /* Check and compose ATA command */ 1319 if (!n_block) 1320 /* For 10-byte and 16-byte SCSI R/W commands, transfer 1321 * length 0 means transfer 0 block of data. 1322 * However, for ATA R/W commands, sector count 0 means 1323 * 256 or 65536 sectors, not 0 sectors as in SCSI. 1324 * 1325 * WARNING: one or two older ATA drives treat 0 as 0... 1326 */ 1327 goto nothing_to_do; 1328 1329 qc->flags |= ATA_QCFLAG_IO; 1330 qc->nbytes = n_block * ATA_SECT_SIZE; 1331 1332 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags, 1333 qc->tag); 1334 if (likely(rc == 0)) 1335 return 0; 1336 1337 if (rc == -ERANGE) 1338 goto out_of_range; 1339 /* treat all other errors as -EINVAL, fall through */ 1340 invalid_fld: 1341 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0); 1342 /* "Invalid field in cbd" */ 1343 return 1; 1344 1345 out_of_range: 1346 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0); 1347 /* "Logical Block Address out of range" */ 1348 return 1; 1349 1350 nothing_to_do: 1351 scmd->result = SAM_STAT_GOOD; 1352 return 1; 1353 } 1354 1355 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) 1356 { 1357 struct ata_port *ap = qc->ap; 1358 struct scsi_cmnd *cmd = qc->scsicmd; 1359 u8 *cdb = cmd->cmnd; 1360 int need_sense = (qc->err_mask != 0); 1361 1362 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and 1363 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE 1364 * cache 1365 */ 1366 if (ap->ops->error_handler && !need_sense) { 1367 switch (qc->tf.command) { 1368 case ATA_CMD_SET_FEATURES: 1369 if ((qc->tf.feature == SETFEATURES_WC_ON) || 1370 (qc->tf.feature == SETFEATURES_WC_OFF)) { 1371 ap->eh_info.action |= ATA_EH_REVALIDATE; 1372 ata_port_schedule_eh(ap); 1373 } 1374 break; 1375 1376 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */ 1377 case ATA_CMD_SET_MULTI: /* multi_count changed */ 1378 ap->eh_info.action |= ATA_EH_REVALIDATE; 1379 ata_port_schedule_eh(ap); 1380 break; 1381 } 1382 } 1383 1384 /* For ATA pass thru (SAT) commands, generate a sense block if 1385 * user mandated it or if there's an error. Note that if we 1386 * generate because the user forced us to, a check condition 1387 * is generated and the ATA register values are returned 1388 * whether the command completed successfully or not. If there 1389 * was no error, SK, ASC and ASCQ will all be zero. 1390 */ 1391 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && 1392 ((cdb[2] & 0x20) || need_sense)) { 1393 ata_gen_passthru_sense(qc); 1394 } else { 1395 if (!need_sense) { 1396 cmd->result = SAM_STAT_GOOD; 1397 } else { 1398 /* TODO: decide which descriptor format to use 1399 * for 48b LBA devices and call that here 1400 * instead of the fixed desc, which is only 1401 * good for smaller LBA (and maybe CHS?) 1402 * devices. 1403 */ 1404 ata_gen_ata_sense(qc); 1405 } 1406 } 1407 1408 /* XXX: track spindown state for spindown skipping and warning */ 1409 if (unlikely(qc->tf.command == ATA_CMD_STANDBY || 1410 qc->tf.command == ATA_CMD_STANDBYNOW1)) 1411 qc->dev->flags |= ATA_DFLAG_SPUNDOWN; 1412 else if (likely(system_state != SYSTEM_HALT && 1413 system_state != SYSTEM_POWER_OFF)) 1414 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN; 1415 1416 if (need_sense && !ap->ops->error_handler) 1417 ata_dump_status(ap->print_id, &qc->result_tf); 1418 1419 qc->scsidone(cmd); 1420 1421 ata_qc_free(qc); 1422 } 1423 1424 /** 1425 * ata_scmd_need_defer - Check whether we need to defer scmd 1426 * @dev: ATA device to which the command is addressed 1427 * @is_io: Is the command IO (and thus possibly NCQ)? 1428 * 1429 * NCQ and non-NCQ commands cannot run together. As upper layer 1430 * only knows the queue depth, we are responsible for maintaining 1431 * exclusion. This function checks whether a new command can be 1432 * issued to @dev. 1433 * 1434 * LOCKING: 1435 * spin_lock_irqsave(host lock) 1436 * 1437 * RETURNS: 1438 * 1 if deferring is needed, 0 otherwise. 1439 */ 1440 static int ata_scmd_need_defer(struct ata_device *dev, int is_io) 1441 { 1442 struct ata_port *ap = dev->ap; 1443 int is_ncq = is_io && ata_ncq_enabled(dev); 1444 1445 if (is_ncq) { 1446 if (!ata_tag_valid(ap->active_tag)) 1447 return 0; 1448 } else { 1449 if (!ata_tag_valid(ap->active_tag) && !ap->sactive) 1450 return 0; 1451 } 1452 return 1; 1453 } 1454 1455 /** 1456 * ata_scsi_translate - Translate then issue SCSI command to ATA device 1457 * @dev: ATA device to which the command is addressed 1458 * @cmd: SCSI command to execute 1459 * @done: SCSI command completion function 1460 * @xlat_func: Actor which translates @cmd to an ATA taskfile 1461 * 1462 * Our ->queuecommand() function has decided that the SCSI 1463 * command issued can be directly translated into an ATA 1464 * command, rather than handled internally. 1465 * 1466 * This function sets up an ata_queued_cmd structure for the 1467 * SCSI command, and sends that ata_queued_cmd to the hardware. 1468 * 1469 * The xlat_func argument (actor) returns 0 if ready to execute 1470 * ATA command, else 1 to finish translation. If 1 is returned 1471 * then cmd->result (and possibly cmd->sense_buffer) are assumed 1472 * to be set reflecting an error condition or clean (early) 1473 * termination. 1474 * 1475 * LOCKING: 1476 * spin_lock_irqsave(host lock) 1477 * 1478 * RETURNS: 1479 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command 1480 * needs to be deferred. 1481 */ 1482 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, 1483 void (*done)(struct scsi_cmnd *), 1484 ata_xlat_func_t xlat_func) 1485 { 1486 struct ata_queued_cmd *qc; 1487 int is_io = xlat_func == ata_scsi_rw_xlat; 1488 1489 VPRINTK("ENTER\n"); 1490 1491 if (unlikely(ata_scmd_need_defer(dev, is_io))) 1492 goto defer; 1493 1494 qc = ata_scsi_qc_new(dev, cmd, done); 1495 if (!qc) 1496 goto err_mem; 1497 1498 /* data is present; dma-map it */ 1499 if (cmd->sc_data_direction == DMA_FROM_DEVICE || 1500 cmd->sc_data_direction == DMA_TO_DEVICE) { 1501 if (unlikely(cmd->request_bufflen < 1)) { 1502 ata_dev_printk(dev, KERN_WARNING, 1503 "WARNING: zero len r/w req\n"); 1504 goto err_did; 1505 } 1506 1507 if (cmd->use_sg) 1508 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg); 1509 else 1510 ata_sg_init_one(qc, cmd->request_buffer, 1511 cmd->request_bufflen); 1512 1513 qc->dma_dir = cmd->sc_data_direction; 1514 } 1515 1516 qc->complete_fn = ata_scsi_qc_complete; 1517 1518 if (xlat_func(qc)) 1519 goto early_finish; 1520 1521 /* select device, send command to hardware */ 1522 ata_qc_issue(qc); 1523 1524 VPRINTK("EXIT\n"); 1525 return 0; 1526 1527 early_finish: 1528 ata_qc_free(qc); 1529 qc->scsidone(cmd); 1530 DPRINTK("EXIT - early finish (good or error)\n"); 1531 return 0; 1532 1533 err_did: 1534 ata_qc_free(qc); 1535 cmd->result = (DID_ERROR << 16); 1536 qc->scsidone(cmd); 1537 err_mem: 1538 DPRINTK("EXIT - internal\n"); 1539 return 0; 1540 1541 defer: 1542 DPRINTK("EXIT - defer\n"); 1543 return SCSI_MLQUEUE_DEVICE_BUSY; 1544 } 1545 1546 /** 1547 * ata_scsi_rbuf_get - Map response buffer. 1548 * @cmd: SCSI command containing buffer to be mapped. 1549 * @buf_out: Pointer to mapped area. 1550 * 1551 * Maps buffer contained within SCSI command @cmd. 1552 * 1553 * LOCKING: 1554 * spin_lock_irqsave(host lock) 1555 * 1556 * RETURNS: 1557 * Length of response buffer. 1558 */ 1559 1560 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out) 1561 { 1562 u8 *buf; 1563 unsigned int buflen; 1564 1565 if (cmd->use_sg) { 1566 struct scatterlist *sg; 1567 1568 sg = (struct scatterlist *) cmd->request_buffer; 1569 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset; 1570 buflen = sg->length; 1571 } else { 1572 buf = cmd->request_buffer; 1573 buflen = cmd->request_bufflen; 1574 } 1575 1576 *buf_out = buf; 1577 return buflen; 1578 } 1579 1580 /** 1581 * ata_scsi_rbuf_put - Unmap response buffer. 1582 * @cmd: SCSI command containing buffer to be unmapped. 1583 * @buf: buffer to unmap 1584 * 1585 * Unmaps response buffer contained within @cmd. 1586 * 1587 * LOCKING: 1588 * spin_lock_irqsave(host lock) 1589 */ 1590 1591 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf) 1592 { 1593 if (cmd->use_sg) { 1594 struct scatterlist *sg; 1595 1596 sg = (struct scatterlist *) cmd->request_buffer; 1597 kunmap_atomic(buf - sg->offset, KM_IRQ0); 1598 } 1599 } 1600 1601 /** 1602 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators 1603 * @args: device IDENTIFY data / SCSI command of interest. 1604 * @actor: Callback hook for desired SCSI command simulator 1605 * 1606 * Takes care of the hard work of simulating a SCSI command... 1607 * Mapping the response buffer, calling the command's handler, 1608 * and handling the handler's return value. This return value 1609 * indicates whether the handler wishes the SCSI command to be 1610 * completed successfully (0), or not (in which case cmd->result 1611 * and sense buffer are assumed to be set). 1612 * 1613 * LOCKING: 1614 * spin_lock_irqsave(host lock) 1615 */ 1616 1617 void ata_scsi_rbuf_fill(struct ata_scsi_args *args, 1618 unsigned int (*actor) (struct ata_scsi_args *args, 1619 u8 *rbuf, unsigned int buflen)) 1620 { 1621 u8 *rbuf; 1622 unsigned int buflen, rc; 1623 struct scsi_cmnd *cmd = args->cmd; 1624 1625 buflen = ata_scsi_rbuf_get(cmd, &rbuf); 1626 memset(rbuf, 0, buflen); 1627 rc = actor(args, rbuf, buflen); 1628 ata_scsi_rbuf_put(cmd, rbuf); 1629 1630 if (rc == 0) 1631 cmd->result = SAM_STAT_GOOD; 1632 args->done(cmd); 1633 } 1634 1635 /** 1636 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer 1637 * @idx: byte index into SCSI response buffer 1638 * @val: value to set 1639 * 1640 * To be used by SCSI command simulator functions. This macros 1641 * expects two local variables, u8 *rbuf and unsigned int buflen, 1642 * are in scope. 1643 * 1644 * LOCKING: 1645 * None. 1646 */ 1647 #define ATA_SCSI_RBUF_SET(idx, val) do { \ 1648 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \ 1649 } while (0) 1650 1651 /** 1652 * ata_scsiop_inq_std - Simulate INQUIRY command 1653 * @args: device IDENTIFY data / SCSI command of interest. 1654 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1655 * @buflen: Response buffer length. 1656 * 1657 * Returns standard device identification data associated 1658 * with non-VPD INQUIRY command output. 1659 * 1660 * LOCKING: 1661 * spin_lock_irqsave(host lock) 1662 */ 1663 1664 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf, 1665 unsigned int buflen) 1666 { 1667 u8 hdr[] = { 1668 TYPE_DISK, 1669 0, 1670 0x5, /* claim SPC-3 version compatibility */ 1671 2, 1672 95 - 4 1673 }; 1674 1675 /* set scsi removeable (RMB) bit per ata bit */ 1676 if (ata_id_removeable(args->id)) 1677 hdr[1] |= (1 << 7); 1678 1679 VPRINTK("ENTER\n"); 1680 1681 memcpy(rbuf, hdr, sizeof(hdr)); 1682 1683 if (buflen > 35) { 1684 memcpy(&rbuf[8], "ATA ", 8); 1685 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); 1686 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); 1687 if (rbuf[32] == 0 || rbuf[32] == ' ') 1688 memcpy(&rbuf[32], "n/a ", 4); 1689 } 1690 1691 if (buflen > 63) { 1692 const u8 versions[] = { 1693 0x60, /* SAM-3 (no version claimed) */ 1694 1695 0x03, 1696 0x20, /* SBC-2 (no version claimed) */ 1697 1698 0x02, 1699 0x60 /* SPC-3 (no version claimed) */ 1700 }; 1701 1702 memcpy(rbuf + 59, versions, sizeof(versions)); 1703 } 1704 1705 return 0; 1706 } 1707 1708 /** 1709 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages 1710 * @args: device IDENTIFY data / SCSI command of interest. 1711 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1712 * @buflen: Response buffer length. 1713 * 1714 * Returns list of inquiry VPD pages available. 1715 * 1716 * LOCKING: 1717 * spin_lock_irqsave(host lock) 1718 */ 1719 1720 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf, 1721 unsigned int buflen) 1722 { 1723 const u8 pages[] = { 1724 0x00, /* page 0x00, this page */ 1725 0x80, /* page 0x80, unit serial no page */ 1726 0x83 /* page 0x83, device ident page */ 1727 }; 1728 rbuf[3] = sizeof(pages); /* number of supported VPD pages */ 1729 1730 if (buflen > 6) 1731 memcpy(rbuf + 4, pages, sizeof(pages)); 1732 1733 return 0; 1734 } 1735 1736 /** 1737 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number 1738 * @args: device IDENTIFY data / SCSI command of interest. 1739 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1740 * @buflen: Response buffer length. 1741 * 1742 * Returns ATA device serial number. 1743 * 1744 * LOCKING: 1745 * spin_lock_irqsave(host lock) 1746 */ 1747 1748 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf, 1749 unsigned int buflen) 1750 { 1751 const u8 hdr[] = { 1752 0, 1753 0x80, /* this page code */ 1754 0, 1755 ATA_ID_SERNO_LEN, /* page len */ 1756 }; 1757 memcpy(rbuf, hdr, sizeof(hdr)); 1758 1759 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1)) 1760 ata_id_string(args->id, (unsigned char *) &rbuf[4], 1761 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1762 1763 return 0; 1764 } 1765 1766 /** 1767 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity 1768 * @args: device IDENTIFY data / SCSI command of interest. 1769 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1770 * @buflen: Response buffer length. 1771 * 1772 * Yields two logical unit device identification designators: 1773 * - vendor specific ASCII containing the ATA serial number 1774 * - SAT defined "t10 vendor id based" containing ASCII vendor 1775 * name ("ATA "), model and serial numbers. 1776 * 1777 * LOCKING: 1778 * spin_lock_irqsave(host lock) 1779 */ 1780 1781 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf, 1782 unsigned int buflen) 1783 { 1784 int num; 1785 const int sat_model_serial_desc_len = 68; 1786 1787 rbuf[1] = 0x83; /* this page code */ 1788 num = 4; 1789 1790 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) { 1791 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ 1792 rbuf[num + 0] = 2; 1793 rbuf[num + 3] = ATA_ID_SERNO_LEN; 1794 num += 4; 1795 ata_id_string(args->id, (unsigned char *) rbuf + num, 1796 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1797 num += ATA_ID_SERNO_LEN; 1798 } 1799 if (buflen > (sat_model_serial_desc_len + num + 3)) { 1800 /* SAT defined lu model and serial numbers descriptor */ 1801 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ 1802 rbuf[num + 0] = 2; 1803 rbuf[num + 1] = 1; 1804 rbuf[num + 3] = sat_model_serial_desc_len; 1805 num += 4; 1806 memcpy(rbuf + num, "ATA ", 8); 1807 num += 8; 1808 ata_id_string(args->id, (unsigned char *) rbuf + num, 1809 ATA_ID_PROD, ATA_ID_PROD_LEN); 1810 num += ATA_ID_PROD_LEN; 1811 ata_id_string(args->id, (unsigned char *) rbuf + num, 1812 ATA_ID_SERNO, ATA_ID_SERNO_LEN); 1813 num += ATA_ID_SERNO_LEN; 1814 } 1815 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ 1816 return 0; 1817 } 1818 1819 /** 1820 * ata_scsiop_noop - Command handler that simply returns success. 1821 * @args: device IDENTIFY data / SCSI command of interest. 1822 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1823 * @buflen: Response buffer length. 1824 * 1825 * No operation. Simply returns success to caller, to indicate 1826 * that the caller should successfully complete this SCSI command. 1827 * 1828 * LOCKING: 1829 * spin_lock_irqsave(host lock) 1830 */ 1831 1832 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf, 1833 unsigned int buflen) 1834 { 1835 VPRINTK("ENTER\n"); 1836 return 0; 1837 } 1838 1839 /** 1840 * ata_msense_push - Push data onto MODE SENSE data output buffer 1841 * @ptr_io: (input/output) Location to store more output data 1842 * @last: End of output data buffer 1843 * @buf: Pointer to BLOB being added to output buffer 1844 * @buflen: Length of BLOB 1845 * 1846 * Store MODE SENSE data on an output buffer. 1847 * 1848 * LOCKING: 1849 * None. 1850 */ 1851 1852 static void ata_msense_push(u8 **ptr_io, const u8 *last, 1853 const u8 *buf, unsigned int buflen) 1854 { 1855 u8 *ptr = *ptr_io; 1856 1857 if ((ptr + buflen - 1) > last) 1858 return; 1859 1860 memcpy(ptr, buf, buflen); 1861 1862 ptr += buflen; 1863 1864 *ptr_io = ptr; 1865 } 1866 1867 /** 1868 * ata_msense_caching - Simulate MODE SENSE caching info page 1869 * @id: device IDENTIFY data 1870 * @ptr_io: (input/output) Location to store more output data 1871 * @last: End of output data buffer 1872 * 1873 * Generate a caching info page, which conditionally indicates 1874 * write caching to the SCSI layer, depending on device 1875 * capabilities. 1876 * 1877 * LOCKING: 1878 * None. 1879 */ 1880 1881 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io, 1882 const u8 *last) 1883 { 1884 u8 page[CACHE_MPAGE_LEN]; 1885 1886 memcpy(page, def_cache_mpage, sizeof(page)); 1887 if (ata_id_wcache_enabled(id)) 1888 page[2] |= (1 << 2); /* write cache enable */ 1889 if (!ata_id_rahead_enabled(id)) 1890 page[12] |= (1 << 5); /* disable read ahead */ 1891 1892 ata_msense_push(ptr_io, last, page, sizeof(page)); 1893 return sizeof(page); 1894 } 1895 1896 /** 1897 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page 1898 * @dev: Device associated with this MODE SENSE command 1899 * @ptr_io: (input/output) Location to store more output data 1900 * @last: End of output data buffer 1901 * 1902 * Generate a generic MODE SENSE control mode page. 1903 * 1904 * LOCKING: 1905 * None. 1906 */ 1907 1908 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last) 1909 { 1910 ata_msense_push(ptr_io, last, def_control_mpage, 1911 sizeof(def_control_mpage)); 1912 return sizeof(def_control_mpage); 1913 } 1914 1915 /** 1916 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page 1917 * @dev: Device associated with this MODE SENSE command 1918 * @ptr_io: (input/output) Location to store more output data 1919 * @last: End of output data buffer 1920 * 1921 * Generate a generic MODE SENSE r/w error recovery page. 1922 * 1923 * LOCKING: 1924 * None. 1925 */ 1926 1927 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last) 1928 { 1929 1930 ata_msense_push(ptr_io, last, def_rw_recovery_mpage, 1931 sizeof(def_rw_recovery_mpage)); 1932 return sizeof(def_rw_recovery_mpage); 1933 } 1934 1935 /* 1936 * We can turn this into a real blacklist if it's needed, for now just 1937 * blacklist any Maxtor BANC1G10 revision firmware 1938 */ 1939 static int ata_dev_supports_fua(u16 *id) 1940 { 1941 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; 1942 1943 if (!libata_fua) 1944 return 0; 1945 if (!ata_id_has_fua(id)) 1946 return 0; 1947 1948 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); 1949 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); 1950 1951 if (strcmp(model, "Maxtor")) 1952 return 1; 1953 if (strcmp(fw, "BANC1G10")) 1954 return 1; 1955 1956 return 0; /* blacklisted */ 1957 } 1958 1959 /** 1960 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands 1961 * @args: device IDENTIFY data / SCSI command of interest. 1962 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 1963 * @buflen: Response buffer length. 1964 * 1965 * Simulate MODE SENSE commands. Assume this is invoked for direct 1966 * access devices (e.g. disks) only. There should be no block 1967 * descriptor for other device types. 1968 * 1969 * LOCKING: 1970 * spin_lock_irqsave(host lock) 1971 */ 1972 1973 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf, 1974 unsigned int buflen) 1975 { 1976 struct ata_device *dev = args->dev; 1977 u8 *scsicmd = args->cmd->cmnd, *p, *last; 1978 const u8 sat_blk_desc[] = { 1979 0, 0, 0, 0, /* number of blocks: sat unspecified */ 1980 0, 1981 0, 0x2, 0x0 /* block length: 512 bytes */ 1982 }; 1983 u8 pg, spg; 1984 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen; 1985 u8 dpofua; 1986 1987 VPRINTK("ENTER\n"); 1988 1989 six_byte = (scsicmd[0] == MODE_SENSE); 1990 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ 1991 /* 1992 * LLBA bit in msense(10) ignored (compliant) 1993 */ 1994 1995 page_control = scsicmd[2] >> 6; 1996 switch (page_control) { 1997 case 0: /* current */ 1998 break; /* supported */ 1999 case 3: /* saved */ 2000 goto saving_not_supp; 2001 case 1: /* changeable */ 2002 case 2: /* defaults */ 2003 default: 2004 goto invalid_fld; 2005 } 2006 2007 if (six_byte) { 2008 output_len = 4 + (ebd ? 8 : 0); 2009 alloc_len = scsicmd[4]; 2010 } else { 2011 output_len = 8 + (ebd ? 8 : 0); 2012 alloc_len = (scsicmd[7] << 8) + scsicmd[8]; 2013 } 2014 minlen = (alloc_len < buflen) ? alloc_len : buflen; 2015 2016 p = rbuf + output_len; 2017 last = rbuf + minlen - 1; 2018 2019 pg = scsicmd[2] & 0x3f; 2020 spg = scsicmd[3]; 2021 /* 2022 * No mode subpages supported (yet) but asking for _all_ 2023 * subpages may be valid 2024 */ 2025 if (spg && (spg != ALL_SUB_MPAGES)) 2026 goto invalid_fld; 2027 2028 switch(pg) { 2029 case RW_RECOVERY_MPAGE: 2030 output_len += ata_msense_rw_recovery(&p, last); 2031 break; 2032 2033 case CACHE_MPAGE: 2034 output_len += ata_msense_caching(args->id, &p, last); 2035 break; 2036 2037 case CONTROL_MPAGE: { 2038 output_len += ata_msense_ctl_mode(&p, last); 2039 break; 2040 } 2041 2042 case ALL_MPAGES: 2043 output_len += ata_msense_rw_recovery(&p, last); 2044 output_len += ata_msense_caching(args->id, &p, last); 2045 output_len += ata_msense_ctl_mode(&p, last); 2046 break; 2047 2048 default: /* invalid page code */ 2049 goto invalid_fld; 2050 } 2051 2052 if (minlen < 1) 2053 return 0; 2054 2055 dpofua = 0; 2056 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && 2057 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) 2058 dpofua = 1 << 4; 2059 2060 if (six_byte) { 2061 output_len--; 2062 rbuf[0] = output_len; 2063 if (minlen > 2) 2064 rbuf[2] |= dpofua; 2065 if (ebd) { 2066 if (minlen > 3) 2067 rbuf[3] = sizeof(sat_blk_desc); 2068 if (minlen > 11) 2069 memcpy(rbuf + 4, sat_blk_desc, 2070 sizeof(sat_blk_desc)); 2071 } 2072 } else { 2073 output_len -= 2; 2074 rbuf[0] = output_len >> 8; 2075 if (minlen > 1) 2076 rbuf[1] = output_len; 2077 if (minlen > 3) 2078 rbuf[3] |= dpofua; 2079 if (ebd) { 2080 if (minlen > 7) 2081 rbuf[7] = sizeof(sat_blk_desc); 2082 if (minlen > 15) 2083 memcpy(rbuf + 8, sat_blk_desc, 2084 sizeof(sat_blk_desc)); 2085 } 2086 } 2087 return 0; 2088 2089 invalid_fld: 2090 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0); 2091 /* "Invalid field in cbd" */ 2092 return 1; 2093 2094 saving_not_supp: 2095 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); 2096 /* "Saving parameters not supported" */ 2097 return 1; 2098 } 2099 2100 /** 2101 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands 2102 * @args: device IDENTIFY data / SCSI command of interest. 2103 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2104 * @buflen: Response buffer length. 2105 * 2106 * Simulate READ CAPACITY commands. 2107 * 2108 * LOCKING: 2109 * None. 2110 */ 2111 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf, 2112 unsigned int buflen) 2113 { 2114 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */ 2115 2116 VPRINTK("ENTER\n"); 2117 2118 if (args->cmd->cmnd[0] == READ_CAPACITY) { 2119 if (last_lba >= 0xffffffffULL) 2120 last_lba = 0xffffffff; 2121 2122 /* sector count, 32-bit */ 2123 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3)); 2124 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2)); 2125 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1)); 2126 ATA_SCSI_RBUF_SET(3, last_lba); 2127 2128 /* sector size */ 2129 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8); 2130 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE); 2131 } else { 2132 /* sector count, 64-bit */ 2133 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7)); 2134 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6)); 2135 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5)); 2136 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4)); 2137 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3)); 2138 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2)); 2139 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1)); 2140 ATA_SCSI_RBUF_SET(7, last_lba); 2141 2142 /* sector size */ 2143 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8); 2144 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE); 2145 } 2146 2147 return 0; 2148 } 2149 2150 /** 2151 * ata_scsiop_report_luns - Simulate REPORT LUNS command 2152 * @args: device IDENTIFY data / SCSI command of interest. 2153 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. 2154 * @buflen: Response buffer length. 2155 * 2156 * Simulate REPORT LUNS command. 2157 * 2158 * LOCKING: 2159 * spin_lock_irqsave(host lock) 2160 */ 2161 2162 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf, 2163 unsigned int buflen) 2164 { 2165 VPRINTK("ENTER\n"); 2166 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ 2167 2168 return 0; 2169 } 2170 2171 /** 2172 * ata_scsi_set_sense - Set SCSI sense data and status 2173 * @cmd: SCSI request to be handled 2174 * @sk: SCSI-defined sense key 2175 * @asc: SCSI-defined additional sense code 2176 * @ascq: SCSI-defined additional sense code qualifier 2177 * 2178 * Helper function that builds a valid fixed format, current 2179 * response code and the given sense key (sk), additional sense 2180 * code (asc) and additional sense code qualifier (ascq) with 2181 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and 2182 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result . 2183 * 2184 * LOCKING: 2185 * Not required 2186 */ 2187 2188 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq) 2189 { 2190 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 2191 2192 cmd->sense_buffer[0] = 0x70; /* fixed format, current */ 2193 cmd->sense_buffer[2] = sk; 2194 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */ 2195 cmd->sense_buffer[12] = asc; 2196 cmd->sense_buffer[13] = ascq; 2197 } 2198 2199 /** 2200 * ata_scsi_badcmd - End a SCSI request with an error 2201 * @cmd: SCSI request to be handled 2202 * @done: SCSI command completion function 2203 * @asc: SCSI-defined additional sense code 2204 * @ascq: SCSI-defined additional sense code qualifier 2205 * 2206 * Helper function that completes a SCSI command with 2207 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST 2208 * and the specified additional sense codes. 2209 * 2210 * LOCKING: 2211 * spin_lock_irqsave(host lock) 2212 */ 2213 2214 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq) 2215 { 2216 DPRINTK("ENTER\n"); 2217 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq); 2218 2219 done(cmd); 2220 } 2221 2222 static void atapi_sense_complete(struct ata_queued_cmd *qc) 2223 { 2224 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { 2225 /* FIXME: not quite right; we don't want the 2226 * translation of taskfile registers into 2227 * a sense descriptors, since that's only 2228 * correct for ATA, not ATAPI 2229 */ 2230 ata_gen_passthru_sense(qc); 2231 } 2232 2233 qc->scsidone(qc->scsicmd); 2234 ata_qc_free(qc); 2235 } 2236 2237 /* is it pointless to prefer PIO for "safety reasons"? */ 2238 static inline int ata_pio_use_silly(struct ata_port *ap) 2239 { 2240 return (ap->flags & ATA_FLAG_PIO_DMA); 2241 } 2242 2243 static void atapi_request_sense(struct ata_queued_cmd *qc) 2244 { 2245 struct ata_port *ap = qc->ap; 2246 struct scsi_cmnd *cmd = qc->scsicmd; 2247 2248 DPRINTK("ATAPI request sense\n"); 2249 2250 /* FIXME: is this needed? */ 2251 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); 2252 2253 ap->ops->tf_read(ap, &qc->tf); 2254 2255 /* fill these in, for the case where they are -not- overwritten */ 2256 cmd->sense_buffer[0] = 0x70; 2257 cmd->sense_buffer[2] = qc->tf.feature >> 4; 2258 2259 ata_qc_reinit(qc); 2260 2261 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer)); 2262 qc->dma_dir = DMA_FROM_DEVICE; 2263 2264 memset(&qc->cdb, 0, qc->dev->cdb_len); 2265 qc->cdb[0] = REQUEST_SENSE; 2266 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; 2267 2268 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2269 qc->tf.command = ATA_CMD_PACKET; 2270 2271 if (ata_pio_use_silly(ap)) { 2272 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2273 qc->tf.feature |= ATAPI_PKT_DMA; 2274 } else { 2275 qc->tf.protocol = ATA_PROT_ATAPI; 2276 qc->tf.lbam = (8 * 1024) & 0xff; 2277 qc->tf.lbah = (8 * 1024) >> 8; 2278 } 2279 qc->nbytes = SCSI_SENSE_BUFFERSIZE; 2280 2281 qc->complete_fn = atapi_sense_complete; 2282 2283 ata_qc_issue(qc); 2284 2285 DPRINTK("EXIT\n"); 2286 } 2287 2288 static void atapi_qc_complete(struct ata_queued_cmd *qc) 2289 { 2290 struct scsi_cmnd *cmd = qc->scsicmd; 2291 unsigned int err_mask = qc->err_mask; 2292 2293 VPRINTK("ENTER, err_mask 0x%X\n", err_mask); 2294 2295 /* handle completion from new EH */ 2296 if (unlikely(qc->ap->ops->error_handler && 2297 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { 2298 2299 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { 2300 /* FIXME: not quite right; we don't want the 2301 * translation of taskfile registers into a 2302 * sense descriptors, since that's only 2303 * correct for ATA, not ATAPI 2304 */ 2305 ata_gen_passthru_sense(qc); 2306 } 2307 2308 /* SCSI EH automatically locks door if sdev->locked is 2309 * set. Sometimes door lock request continues to 2310 * fail, for example, when no media is present. This 2311 * creates a loop - SCSI EH issues door lock which 2312 * fails and gets invoked again to acquire sense data 2313 * for the failed command. 2314 * 2315 * If door lock fails, always clear sdev->locked to 2316 * avoid this infinite loop. 2317 */ 2318 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL) 2319 qc->dev->sdev->locked = 0; 2320 2321 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; 2322 qc->scsidone(cmd); 2323 ata_qc_free(qc); 2324 return; 2325 } 2326 2327 /* successful completion or old EH failure path */ 2328 if (unlikely(err_mask & AC_ERR_DEV)) { 2329 cmd->result = SAM_STAT_CHECK_CONDITION; 2330 atapi_request_sense(qc); 2331 return; 2332 } else if (unlikely(err_mask)) { 2333 /* FIXME: not quite right; we don't want the 2334 * translation of taskfile registers into 2335 * a sense descriptors, since that's only 2336 * correct for ATA, not ATAPI 2337 */ 2338 ata_gen_passthru_sense(qc); 2339 } else { 2340 u8 *scsicmd = cmd->cmnd; 2341 2342 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) { 2343 u8 *buf = NULL; 2344 unsigned int buflen; 2345 2346 buflen = ata_scsi_rbuf_get(cmd, &buf); 2347 2348 /* ATAPI devices typically report zero for their SCSI version, 2349 * and sometimes deviate from the spec WRT response data 2350 * format. If SCSI version is reported as zero like normal, 2351 * then we make the following fixups: 1) Fake MMC-5 version, 2352 * to indicate to the Linux scsi midlayer this is a modern 2353 * device. 2) Ensure response data format / ATAPI information 2354 * are always correct. 2355 */ 2356 if (buf[2] == 0) { 2357 buf[2] = 0x5; 2358 buf[3] = 0x32; 2359 } 2360 2361 ata_scsi_rbuf_put(cmd, buf); 2362 } 2363 2364 cmd->result = SAM_STAT_GOOD; 2365 } 2366 2367 qc->scsidone(cmd); 2368 ata_qc_free(qc); 2369 } 2370 /** 2371 * atapi_xlat - Initialize PACKET taskfile 2372 * @qc: command structure to be initialized 2373 * 2374 * LOCKING: 2375 * spin_lock_irqsave(host lock) 2376 * 2377 * RETURNS: 2378 * Zero on success, non-zero on failure. 2379 */ 2380 static unsigned int atapi_xlat(struct ata_queued_cmd *qc) 2381 { 2382 struct scsi_cmnd *scmd = qc->scsicmd; 2383 struct ata_device *dev = qc->dev; 2384 int using_pio = (dev->flags & ATA_DFLAG_PIO); 2385 int nodata = (scmd->sc_data_direction == DMA_NONE); 2386 2387 memset(qc->cdb, 0, dev->cdb_len); 2388 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); 2389 2390 qc->complete_fn = atapi_qc_complete; 2391 2392 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2393 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 2394 qc->tf.flags |= ATA_TFLAG_WRITE; 2395 DPRINTK("direction: write\n"); 2396 } 2397 2398 qc->tf.command = ATA_CMD_PACKET; 2399 qc->nbytes = scmd->request_bufflen; 2400 2401 /* check whether ATAPI DMA is safe */ 2402 if (!using_pio && ata_check_atapi_dma(qc)) 2403 using_pio = 1; 2404 2405 if (using_pio || nodata) { 2406 /* no data, or PIO data xfer */ 2407 if (nodata) 2408 qc->tf.protocol = ATA_PROT_ATAPI_NODATA; 2409 else 2410 qc->tf.protocol = ATA_PROT_ATAPI; 2411 qc->tf.lbam = (8 * 1024) & 0xff; 2412 qc->tf.lbah = (8 * 1024) >> 8; 2413 } else { 2414 /* DMA data xfer */ 2415 qc->tf.protocol = ATA_PROT_ATAPI_DMA; 2416 qc->tf.feature |= ATAPI_PKT_DMA; 2417 2418 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE)) 2419 /* some SATA bridges need us to indicate data xfer direction */ 2420 qc->tf.feature |= ATAPI_DMADIR; 2421 } 2422 2423 return 0; 2424 } 2425 2426 static struct ata_device * ata_find_dev(struct ata_port *ap, int id) 2427 { 2428 if (likely(id < ATA_MAX_DEVICES)) 2429 return &ap->device[id]; 2430 return NULL; 2431 } 2432 2433 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap, 2434 const struct scsi_device *scsidev) 2435 { 2436 /* skip commands not addressed to targets we simulate */ 2437 if (unlikely(scsidev->channel || scsidev->lun)) 2438 return NULL; 2439 2440 return ata_find_dev(ap, scsidev->id); 2441 } 2442 2443 /** 2444 * ata_scsi_dev_enabled - determine if device is enabled 2445 * @dev: ATA device 2446 * 2447 * Determine if commands should be sent to the specified device. 2448 * 2449 * LOCKING: 2450 * spin_lock_irqsave(host lock) 2451 * 2452 * RETURNS: 2453 * 0 if commands are not allowed / 1 if commands are allowed 2454 */ 2455 2456 static int ata_scsi_dev_enabled(struct ata_device *dev) 2457 { 2458 if (unlikely(!ata_dev_enabled(dev))) 2459 return 0; 2460 2461 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) { 2462 if (unlikely(dev->class == ATA_DEV_ATAPI)) { 2463 ata_dev_printk(dev, KERN_WARNING, 2464 "WARNING: ATAPI is %s, device ignored.\n", 2465 atapi_enabled ? "not supported with this driver" : "disabled"); 2466 return 0; 2467 } 2468 } 2469 2470 return 1; 2471 } 2472 2473 /** 2474 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd 2475 * @ap: ATA port to which the device is attached 2476 * @scsidev: SCSI device from which we derive the ATA device 2477 * 2478 * Given various information provided in struct scsi_cmnd, 2479 * map that onto an ATA bus, and using that mapping 2480 * determine which ata_device is associated with the 2481 * SCSI command to be sent. 2482 * 2483 * LOCKING: 2484 * spin_lock_irqsave(host lock) 2485 * 2486 * RETURNS: 2487 * Associated ATA device, or %NULL if not found. 2488 */ 2489 static struct ata_device * 2490 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev) 2491 { 2492 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev); 2493 2494 if (unlikely(!dev || !ata_scsi_dev_enabled(dev))) 2495 return NULL; 2496 2497 return dev; 2498 } 2499 2500 /* 2501 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value. 2502 * @byte1: Byte 1 from pass-thru CDB. 2503 * 2504 * RETURNS: 2505 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise. 2506 */ 2507 static u8 2508 ata_scsi_map_proto(u8 byte1) 2509 { 2510 switch((byte1 & 0x1e) >> 1) { 2511 case 3: /* Non-data */ 2512 return ATA_PROT_NODATA; 2513 2514 case 6: /* DMA */ 2515 case 10: /* UDMA Data-in */ 2516 case 11: /* UDMA Data-Out */ 2517 return ATA_PROT_DMA; 2518 2519 case 4: /* PIO Data-in */ 2520 case 5: /* PIO Data-out */ 2521 return ATA_PROT_PIO; 2522 2523 case 0: /* Hard Reset */ 2524 case 1: /* SRST */ 2525 case 8: /* Device Diagnostic */ 2526 case 9: /* Device Reset */ 2527 case 7: /* DMA Queued */ 2528 case 12: /* FPDMA */ 2529 case 15: /* Return Response Info */ 2530 default: /* Reserved */ 2531 break; 2532 } 2533 2534 return ATA_PROT_UNKNOWN; 2535 } 2536 2537 /** 2538 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile 2539 * @qc: command structure to be initialized 2540 * 2541 * Handles either 12 or 16-byte versions of the CDB. 2542 * 2543 * RETURNS: 2544 * Zero on success, non-zero on failure. 2545 */ 2546 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 2547 { 2548 struct ata_taskfile *tf = &(qc->tf); 2549 struct scsi_cmnd *scmd = qc->scsicmd; 2550 struct ata_device *dev = qc->dev; 2551 const u8 *cdb = scmd->cmnd; 2552 2553 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) 2554 goto invalid_fld; 2555 2556 /* We may not issue DMA commands if no DMA mode is set */ 2557 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) 2558 goto invalid_fld; 2559 2560 /* 2561 * 12 and 16 byte CDBs use different offsets to 2562 * provide the various register values. 2563 */ 2564 if (cdb[0] == ATA_16) { 2565 /* 2566 * 16-byte CDB - may contain extended commands. 2567 * 2568 * If that is the case, copy the upper byte register values. 2569 */ 2570 if (cdb[1] & 0x01) { 2571 tf->hob_feature = cdb[3]; 2572 tf->hob_nsect = cdb[5]; 2573 tf->hob_lbal = cdb[7]; 2574 tf->hob_lbam = cdb[9]; 2575 tf->hob_lbah = cdb[11]; 2576 tf->flags |= ATA_TFLAG_LBA48; 2577 } else 2578 tf->flags &= ~ATA_TFLAG_LBA48; 2579 2580 /* 2581 * Always copy low byte, device and command registers. 2582 */ 2583 tf->feature = cdb[4]; 2584 tf->nsect = cdb[6]; 2585 tf->lbal = cdb[8]; 2586 tf->lbam = cdb[10]; 2587 tf->lbah = cdb[12]; 2588 tf->device = cdb[13]; 2589 tf->command = cdb[14]; 2590 } else { 2591 /* 2592 * 12-byte CDB - incapable of extended commands. 2593 */ 2594 tf->flags &= ~ATA_TFLAG_LBA48; 2595 2596 tf->feature = cdb[3]; 2597 tf->nsect = cdb[4]; 2598 tf->lbal = cdb[5]; 2599 tf->lbam = cdb[6]; 2600 tf->lbah = cdb[7]; 2601 tf->device = cdb[8]; 2602 tf->command = cdb[9]; 2603 } 2604 2605 /* enforce correct master/slave bit */ 2606 tf->device = dev->devno ? 2607 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1; 2608 2609 /* sanity check for pio multi commands */ 2610 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) 2611 goto invalid_fld; 2612 2613 if (is_multi_taskfile(tf)) { 2614 unsigned int multi_count = 1 << (cdb[1] >> 5); 2615 2616 /* compare the passed through multi_count 2617 * with the cached multi_count of libata 2618 */ 2619 if (multi_count != dev->multi_count) 2620 ata_dev_printk(dev, KERN_WARNING, 2621 "invalid multi_count %u ignored\n", 2622 multi_count); 2623 } 2624 2625 /* READ/WRITE LONG use a non-standard sect_size */ 2626 qc->sect_size = ATA_SECT_SIZE; 2627 switch (tf->command) { 2628 case ATA_CMD_READ_LONG: 2629 case ATA_CMD_READ_LONG_ONCE: 2630 case ATA_CMD_WRITE_LONG: 2631 case ATA_CMD_WRITE_LONG_ONCE: 2632 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) 2633 goto invalid_fld; 2634 qc->sect_size = scmd->request_bufflen; 2635 } 2636 2637 /* 2638 * Filter SET_FEATURES - XFER MODE command -- otherwise, 2639 * SET_FEATURES - XFER MODE must be preceded/succeeded 2640 * by an update to hardware-specific registers for each 2641 * controller (i.e. the reason for ->set_piomode(), 2642 * ->set_dmamode(), and ->post_set_mode() hooks). 2643 */ 2644 if ((tf->command == ATA_CMD_SET_FEATURES) 2645 && (tf->feature == SETFEATURES_XFER)) 2646 goto invalid_fld; 2647 2648 /* 2649 * Set flags so that all registers will be written, 2650 * and pass on write indication (used for PIO/DMA 2651 * setup.) 2652 */ 2653 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE); 2654 2655 if (scmd->sc_data_direction == DMA_TO_DEVICE) 2656 tf->flags |= ATA_TFLAG_WRITE; 2657 2658 /* 2659 * Set transfer length. 2660 * 2661 * TODO: find out if we need to do more here to 2662 * cover scatter/gather case. 2663 */ 2664 qc->nbytes = scmd->request_bufflen; 2665 2666 /* request result TF */ 2667 qc->flags |= ATA_QCFLAG_RESULT_TF; 2668 2669 return 0; 2670 2671 invalid_fld: 2672 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00); 2673 /* "Invalid field in cdb" */ 2674 return 1; 2675 } 2676 2677 /** 2678 * ata_get_xlat_func - check if SCSI to ATA translation is possible 2679 * @dev: ATA device 2680 * @cmd: SCSI command opcode to consider 2681 * 2682 * Look up the SCSI command given, and determine whether the 2683 * SCSI command is to be translated or simulated. 2684 * 2685 * RETURNS: 2686 * Pointer to translation function if possible, %NULL if not. 2687 */ 2688 2689 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) 2690 { 2691 switch (cmd) { 2692 case READ_6: 2693 case READ_10: 2694 case READ_16: 2695 2696 case WRITE_6: 2697 case WRITE_10: 2698 case WRITE_16: 2699 return ata_scsi_rw_xlat; 2700 2701 case SYNCHRONIZE_CACHE: 2702 if (ata_try_flush_cache(dev)) 2703 return ata_scsi_flush_xlat; 2704 break; 2705 2706 case VERIFY: 2707 case VERIFY_16: 2708 return ata_scsi_verify_xlat; 2709 2710 case ATA_12: 2711 case ATA_16: 2712 return ata_scsi_pass_thru; 2713 2714 case START_STOP: 2715 return ata_scsi_start_stop_xlat; 2716 } 2717 2718 return NULL; 2719 } 2720 2721 /** 2722 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg 2723 * @ap: ATA port to which the command was being sent 2724 * @cmd: SCSI command to dump 2725 * 2726 * Prints the contents of a SCSI command via printk(). 2727 */ 2728 2729 static inline void ata_scsi_dump_cdb(struct ata_port *ap, 2730 struct scsi_cmnd *cmd) 2731 { 2732 #ifdef ATA_DEBUG 2733 struct scsi_device *scsidev = cmd->device; 2734 u8 *scsicmd = cmd->cmnd; 2735 2736 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 2737 ap->print_id, 2738 scsidev->channel, scsidev->id, scsidev->lun, 2739 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], 2740 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], 2741 scsicmd[8]); 2742 #endif 2743 } 2744 2745 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, 2746 void (*done)(struct scsi_cmnd *), 2747 struct ata_device *dev) 2748 { 2749 int rc = 0; 2750 2751 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) { 2752 DPRINTK("bad CDB len=%u, max=%u\n", 2753 scmd->cmd_len, dev->cdb_len); 2754 scmd->result = DID_ERROR << 16; 2755 done(scmd); 2756 return 0; 2757 } 2758 2759 if (dev->class == ATA_DEV_ATA) { 2760 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev, 2761 scmd->cmnd[0]); 2762 2763 if (xlat_func) 2764 rc = ata_scsi_translate(dev, scmd, done, xlat_func); 2765 else 2766 ata_scsi_simulate(dev, scmd, done); 2767 } else 2768 rc = ata_scsi_translate(dev, scmd, done, atapi_xlat); 2769 2770 return rc; 2771 } 2772 2773 /** 2774 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device 2775 * @cmd: SCSI command to be sent 2776 * @done: Completion function, called when command is complete 2777 * 2778 * In some cases, this function translates SCSI commands into 2779 * ATA taskfiles, and queues the taskfiles to be sent to 2780 * hardware. In other cases, this function simulates a 2781 * SCSI device by evaluating and responding to certain 2782 * SCSI commands. This creates the overall effect of 2783 * ATA and ATAPI devices appearing as SCSI devices. 2784 * 2785 * LOCKING: 2786 * Releases scsi-layer-held lock, and obtains host lock. 2787 * 2788 * RETURNS: 2789 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 2790 * 0 otherwise. 2791 */ 2792 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2793 { 2794 struct ata_port *ap; 2795 struct ata_device *dev; 2796 struct scsi_device *scsidev = cmd->device; 2797 struct Scsi_Host *shost = scsidev->host; 2798 int rc = 0; 2799 2800 ap = ata_shost_to_port(shost); 2801 2802 spin_unlock(shost->host_lock); 2803 spin_lock(ap->lock); 2804 2805 ata_scsi_dump_cdb(ap, cmd); 2806 2807 dev = ata_scsi_find_dev(ap, scsidev); 2808 if (likely(dev)) 2809 rc = __ata_scsi_queuecmd(cmd, done, dev); 2810 else { 2811 cmd->result = (DID_BAD_TARGET << 16); 2812 done(cmd); 2813 } 2814 2815 spin_unlock(ap->lock); 2816 spin_lock(shost->host_lock); 2817 return rc; 2818 } 2819 2820 /** 2821 * ata_scsi_simulate - simulate SCSI command on ATA device 2822 * @dev: the target device 2823 * @cmd: SCSI command being sent to device. 2824 * @done: SCSI command completion function. 2825 * 2826 * Interprets and directly executes a select list of SCSI commands 2827 * that can be handled internally. 2828 * 2829 * LOCKING: 2830 * spin_lock_irqsave(host lock) 2831 */ 2832 2833 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 2834 void (*done)(struct scsi_cmnd *)) 2835 { 2836 struct ata_scsi_args args; 2837 const u8 *scsicmd = cmd->cmnd; 2838 2839 args.dev = dev; 2840 args.id = dev->id; 2841 args.cmd = cmd; 2842 args.done = done; 2843 2844 switch(scsicmd[0]) { 2845 /* no-op's, complete with success */ 2846 case SYNCHRONIZE_CACHE: 2847 case REZERO_UNIT: 2848 case SEEK_6: 2849 case SEEK_10: 2850 case TEST_UNIT_READY: 2851 case FORMAT_UNIT: /* FIXME: correct? */ 2852 case SEND_DIAGNOSTIC: /* FIXME: correct? */ 2853 ata_scsi_rbuf_fill(&args, ata_scsiop_noop); 2854 break; 2855 2856 case INQUIRY: 2857 if (scsicmd[1] & 2) /* is CmdDt set? */ 2858 ata_scsi_invalid_field(cmd, done); 2859 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ 2860 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); 2861 else if (scsicmd[2] == 0x00) 2862 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); 2863 else if (scsicmd[2] == 0x80) 2864 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); 2865 else if (scsicmd[2] == 0x83) 2866 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); 2867 else 2868 ata_scsi_invalid_field(cmd, done); 2869 break; 2870 2871 case MODE_SENSE: 2872 case MODE_SENSE_10: 2873 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); 2874 break; 2875 2876 case MODE_SELECT: /* unconditionally return */ 2877 case MODE_SELECT_10: /* bad-field-in-cdb */ 2878 ata_scsi_invalid_field(cmd, done); 2879 break; 2880 2881 case READ_CAPACITY: 2882 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2883 break; 2884 2885 case SERVICE_ACTION_IN: 2886 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) 2887 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); 2888 else 2889 ata_scsi_invalid_field(cmd, done); 2890 break; 2891 2892 case REPORT_LUNS: 2893 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); 2894 break; 2895 2896 /* mandatory commands we haven't implemented yet */ 2897 case REQUEST_SENSE: 2898 2899 /* all other commands */ 2900 default: 2901 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0); 2902 /* "Invalid command operation code" */ 2903 done(cmd); 2904 break; 2905 } 2906 } 2907 2908 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht) 2909 { 2910 int i, rc; 2911 2912 for (i = 0; i < host->n_ports; i++) { 2913 struct ata_port *ap = host->ports[i]; 2914 struct Scsi_Host *shost; 2915 2916 rc = -ENOMEM; 2917 shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); 2918 if (!shost) 2919 goto err_alloc; 2920 2921 *(struct ata_port **)&shost->hostdata[0] = ap; 2922 ap->scsi_host = shost; 2923 2924 shost->transportt = &ata_scsi_transport_template; 2925 shost->unique_id = ap->print_id; 2926 shost->max_id = 16; 2927 shost->max_lun = 1; 2928 shost->max_channel = 1; 2929 shost->max_cmd_len = 16; 2930 2931 rc = scsi_add_host(ap->scsi_host, ap->host->dev); 2932 if (rc) 2933 goto err_add; 2934 } 2935 2936 return 0; 2937 2938 err_add: 2939 scsi_host_put(host->ports[i]->scsi_host); 2940 err_alloc: 2941 while (--i >= 0) { 2942 struct Scsi_Host *shost = host->ports[i]->scsi_host; 2943 2944 scsi_remove_host(shost); 2945 scsi_host_put(shost); 2946 } 2947 return rc; 2948 } 2949 2950 void ata_scsi_scan_host(struct ata_port *ap) 2951 { 2952 unsigned int i; 2953 2954 if (ap->flags & ATA_FLAG_DISABLED) 2955 return; 2956 2957 for (i = 0; i < ATA_MAX_DEVICES; i++) { 2958 struct ata_device *dev = &ap->device[i]; 2959 struct scsi_device *sdev; 2960 2961 if (!ata_dev_enabled(dev) || dev->sdev) 2962 continue; 2963 2964 sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL); 2965 if (!IS_ERR(sdev)) { 2966 dev->sdev = sdev; 2967 scsi_device_put(sdev); 2968 } 2969 } 2970 } 2971 2972 /** 2973 * ata_scsi_offline_dev - offline attached SCSI device 2974 * @dev: ATA device to offline attached SCSI device for 2975 * 2976 * This function is called from ata_eh_hotplug() and responsible 2977 * for taking the SCSI device attached to @dev offline. This 2978 * function is called with host lock which protects dev->sdev 2979 * against clearing. 2980 * 2981 * LOCKING: 2982 * spin_lock_irqsave(host lock) 2983 * 2984 * RETURNS: 2985 * 1 if attached SCSI device exists, 0 otherwise. 2986 */ 2987 int ata_scsi_offline_dev(struct ata_device *dev) 2988 { 2989 if (dev->sdev) { 2990 scsi_device_set_state(dev->sdev, SDEV_OFFLINE); 2991 return 1; 2992 } 2993 return 0; 2994 } 2995 2996 /** 2997 * ata_scsi_remove_dev - remove attached SCSI device 2998 * @dev: ATA device to remove attached SCSI device for 2999 * 3000 * This function is called from ata_eh_scsi_hotplug() and 3001 * responsible for removing the SCSI device attached to @dev. 3002 * 3003 * LOCKING: 3004 * Kernel thread context (may sleep). 3005 */ 3006 static void ata_scsi_remove_dev(struct ata_device *dev) 3007 { 3008 struct ata_port *ap = dev->ap; 3009 struct scsi_device *sdev; 3010 unsigned long flags; 3011 3012 /* Alas, we need to grab scan_mutex to ensure SCSI device 3013 * state doesn't change underneath us and thus 3014 * scsi_device_get() always succeeds. The mutex locking can 3015 * be removed if there is __scsi_device_get() interface which 3016 * increments reference counts regardless of device state. 3017 */ 3018 mutex_lock(&ap->scsi_host->scan_mutex); 3019 spin_lock_irqsave(ap->lock, flags); 3020 3021 /* clearing dev->sdev is protected by host lock */ 3022 sdev = dev->sdev; 3023 dev->sdev = NULL; 3024 3025 if (sdev) { 3026 /* If user initiated unplug races with us, sdev can go 3027 * away underneath us after the host lock and 3028 * scan_mutex are released. Hold onto it. 3029 */ 3030 if (scsi_device_get(sdev) == 0) { 3031 /* The following ensures the attached sdev is 3032 * offline on return from ata_scsi_offline_dev() 3033 * regardless it wins or loses the race 3034 * against this function. 3035 */ 3036 scsi_device_set_state(sdev, SDEV_OFFLINE); 3037 } else { 3038 WARN_ON(1); 3039 sdev = NULL; 3040 } 3041 } 3042 3043 spin_unlock_irqrestore(ap->lock, flags); 3044 mutex_unlock(&ap->scsi_host->scan_mutex); 3045 3046 if (sdev) { 3047 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n", 3048 sdev->sdev_gendev.bus_id); 3049 3050 scsi_remove_device(sdev); 3051 scsi_device_put(sdev); 3052 } 3053 } 3054 3055 /** 3056 * ata_scsi_hotplug - SCSI part of hotplug 3057 * @work: Pointer to ATA port to perform SCSI hotplug on 3058 * 3059 * Perform SCSI part of hotplug. It's executed from a separate 3060 * workqueue after EH completes. This is necessary because SCSI 3061 * hot plugging requires working EH and hot unplugging is 3062 * synchronized with hot plugging with a mutex. 3063 * 3064 * LOCKING: 3065 * Kernel thread context (may sleep). 3066 */ 3067 void ata_scsi_hotplug(struct work_struct *work) 3068 { 3069 struct ata_port *ap = 3070 container_of(work, struct ata_port, hotplug_task.work); 3071 int i; 3072 3073 if (ap->pflags & ATA_PFLAG_UNLOADING) { 3074 DPRINTK("ENTER/EXIT - unloading\n"); 3075 return; 3076 } 3077 3078 DPRINTK("ENTER\n"); 3079 3080 /* unplug detached devices */ 3081 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3082 struct ata_device *dev = &ap->device[i]; 3083 unsigned long flags; 3084 3085 if (!(dev->flags & ATA_DFLAG_DETACHED)) 3086 continue; 3087 3088 spin_lock_irqsave(ap->lock, flags); 3089 dev->flags &= ~ATA_DFLAG_DETACHED; 3090 spin_unlock_irqrestore(ap->lock, flags); 3091 3092 ata_scsi_remove_dev(dev); 3093 } 3094 3095 /* scan for new ones */ 3096 ata_scsi_scan_host(ap); 3097 3098 /* If we scanned while EH was in progress, scan would have 3099 * failed silently. Requeue if there are enabled but 3100 * unattached devices. 3101 */ 3102 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3103 struct ata_device *dev = &ap->device[i]; 3104 if (ata_dev_enabled(dev) && !dev->sdev) { 3105 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 3106 round_jiffies_relative(HZ)); 3107 break; 3108 } 3109 } 3110 3111 DPRINTK("EXIT\n"); 3112 } 3113 3114 /** 3115 * ata_scsi_user_scan - indication for user-initiated bus scan 3116 * @shost: SCSI host to scan 3117 * @channel: Channel to scan 3118 * @id: ID to scan 3119 * @lun: LUN to scan 3120 * 3121 * This function is called when user explicitly requests bus 3122 * scan. Set probe pending flag and invoke EH. 3123 * 3124 * LOCKING: 3125 * SCSI layer (we don't care) 3126 * 3127 * RETURNS: 3128 * Zero. 3129 */ 3130 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, 3131 unsigned int id, unsigned int lun) 3132 { 3133 struct ata_port *ap = ata_shost_to_port(shost); 3134 unsigned long flags; 3135 int rc = 0; 3136 3137 if (!ap->ops->error_handler) 3138 return -EOPNOTSUPP; 3139 3140 if ((channel != SCAN_WILD_CARD && channel != 0) || 3141 (lun != SCAN_WILD_CARD && lun != 0)) 3142 return -EINVAL; 3143 3144 spin_lock_irqsave(ap->lock, flags); 3145 3146 if (id == SCAN_WILD_CARD) { 3147 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1; 3148 ap->eh_info.action |= ATA_EH_SOFTRESET; 3149 } else { 3150 struct ata_device *dev = ata_find_dev(ap, id); 3151 3152 if (dev) { 3153 ap->eh_info.probe_mask |= 1 << dev->devno; 3154 ap->eh_info.action |= ATA_EH_SOFTRESET; 3155 ap->eh_info.flags |= ATA_EHI_RESUME_LINK; 3156 } else 3157 rc = -EINVAL; 3158 } 3159 3160 if (rc == 0) { 3161 ata_port_schedule_eh(ap); 3162 spin_unlock_irqrestore(ap->lock, flags); 3163 ata_port_wait_eh(ap); 3164 } else 3165 spin_unlock_irqrestore(ap->lock, flags); 3166 3167 return rc; 3168 } 3169 3170 /** 3171 * ata_scsi_dev_rescan - initiate scsi_rescan_device() 3172 * @work: Pointer to ATA port to perform scsi_rescan_device() 3173 * 3174 * After ATA pass thru (SAT) commands are executed successfully, 3175 * libata need to propagate the changes to SCSI layer. This 3176 * function must be executed from ata_aux_wq such that sdev 3177 * attach/detach don't race with rescan. 3178 * 3179 * LOCKING: 3180 * Kernel thread context (may sleep). 3181 */ 3182 void ata_scsi_dev_rescan(struct work_struct *work) 3183 { 3184 struct ata_port *ap = 3185 container_of(work, struct ata_port, scsi_rescan_task); 3186 unsigned long flags; 3187 unsigned int i; 3188 3189 spin_lock_irqsave(ap->lock, flags); 3190 3191 for (i = 0; i < ATA_MAX_DEVICES; i++) { 3192 struct ata_device *dev = &ap->device[i]; 3193 struct scsi_device *sdev = dev->sdev; 3194 3195 if (!ata_dev_enabled(dev) || !sdev) 3196 continue; 3197 if (scsi_device_get(sdev)) 3198 continue; 3199 3200 spin_unlock_irqrestore(ap->lock, flags); 3201 scsi_rescan_device(&(sdev->sdev_gendev)); 3202 scsi_device_put(sdev); 3203 spin_lock_irqsave(ap->lock, flags); 3204 } 3205 3206 spin_unlock_irqrestore(ap->lock, flags); 3207 } 3208 3209 /** 3210 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 3211 * @host: ATA host container for all SAS ports 3212 * @port_info: Information from low-level host driver 3213 * @shost: SCSI host that the scsi device is attached to 3214 * 3215 * LOCKING: 3216 * PCI/etc. bus probe sem. 3217 * 3218 * RETURNS: 3219 * ata_port pointer on success / NULL on failure. 3220 */ 3221 3222 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 3223 struct ata_port_info *port_info, 3224 struct Scsi_Host *shost) 3225 { 3226 struct ata_port *ap; 3227 3228 ap = ata_port_alloc(host); 3229 if (!ap) 3230 return NULL; 3231 3232 ap->port_no = 0; 3233 ap->lock = shost->host_lock; 3234 ap->pio_mask = port_info->pio_mask; 3235 ap->mwdma_mask = port_info->mwdma_mask; 3236 ap->udma_mask = port_info->udma_mask; 3237 ap->flags |= port_info->flags; 3238 ap->ops = port_info->port_ops; 3239 ap->cbl = ATA_CBL_SATA; 3240 3241 return ap; 3242 } 3243 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 3244 3245 /** 3246 * ata_sas_port_start - Set port up for dma. 3247 * @ap: Port to initialize 3248 * 3249 * Called just after data structures for each port are 3250 * initialized. Allocates DMA pad. 3251 * 3252 * May be used as the port_start() entry in ata_port_operations. 3253 * 3254 * LOCKING: 3255 * Inherited from caller. 3256 */ 3257 int ata_sas_port_start(struct ata_port *ap) 3258 { 3259 return ata_pad_alloc(ap, ap->dev); 3260 } 3261 EXPORT_SYMBOL_GPL(ata_sas_port_start); 3262 3263 /** 3264 * ata_port_stop - Undo ata_sas_port_start() 3265 * @ap: Port to shut down 3266 * 3267 * Frees the DMA pad. 3268 * 3269 * May be used as the port_stop() entry in ata_port_operations. 3270 * 3271 * LOCKING: 3272 * Inherited from caller. 3273 */ 3274 3275 void ata_sas_port_stop(struct ata_port *ap) 3276 { 3277 ata_pad_free(ap, ap->dev); 3278 } 3279 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 3280 3281 /** 3282 * ata_sas_port_init - Initialize a SATA device 3283 * @ap: SATA port to initialize 3284 * 3285 * LOCKING: 3286 * PCI/etc. bus probe sem. 3287 * 3288 * RETURNS: 3289 * Zero on success, non-zero on error. 3290 */ 3291 3292 int ata_sas_port_init(struct ata_port *ap) 3293 { 3294 int rc = ap->ops->port_start(ap); 3295 3296 if (!rc) { 3297 ap->print_id = ata_print_id++; 3298 rc = ata_bus_probe(ap); 3299 } 3300 3301 return rc; 3302 } 3303 EXPORT_SYMBOL_GPL(ata_sas_port_init); 3304 3305 /** 3306 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 3307 * @ap: SATA port to destroy 3308 * 3309 */ 3310 3311 void ata_sas_port_destroy(struct ata_port *ap) 3312 { 3313 if (ap->ops->port_stop) 3314 ap->ops->port_stop(ap); 3315 kfree(ap); 3316 } 3317 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 3318 3319 /** 3320 * ata_sas_slave_configure - Default slave_config routine for libata devices 3321 * @sdev: SCSI device to configure 3322 * @ap: ATA port to which SCSI device is attached 3323 * 3324 * RETURNS: 3325 * Zero. 3326 */ 3327 3328 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 3329 { 3330 ata_scsi_sdev_config(sdev); 3331 ata_scsi_dev_config(sdev, ap->device); 3332 return 0; 3333 } 3334 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 3335 3336 /** 3337 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 3338 * @cmd: SCSI command to be sent 3339 * @done: Completion function, called when command is complete 3340 * @ap: ATA port to which the command is being sent 3341 * 3342 * RETURNS: 3343 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 3344 * 0 otherwise. 3345 */ 3346 3347 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), 3348 struct ata_port *ap) 3349 { 3350 int rc = 0; 3351 3352 ata_scsi_dump_cdb(ap, cmd); 3353 3354 if (likely(ata_scsi_dev_enabled(ap->device))) 3355 rc = __ata_scsi_queuecmd(cmd, done, ap->device); 3356 else { 3357 cmd->result = (DID_BAD_TARGET << 16); 3358 done(cmd); 3359 } 3360 return rc; 3361 } 3362 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 3363