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