linux/drivers/ata/libata-scsi.c
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   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 <linux/uaccess.h>
  49
  50#include "libata.h"
  51
  52#define SECTOR_SIZE             512
  53#define ATA_SCSI_RBUF_SIZE      4096
  54
  55static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
  56static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
  57
  58typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
  59
  60static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
  61                                        const struct scsi_device *scsidev);
  62static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
  63                                            const struct scsi_device *scsidev);
  64static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
  65                              unsigned int id, unsigned int lun);
  66
  67
  68#define RW_RECOVERY_MPAGE 0x1
  69#define RW_RECOVERY_MPAGE_LEN 12
  70#define CACHE_MPAGE 0x8
  71#define CACHE_MPAGE_LEN 20
  72#define CONTROL_MPAGE 0xa
  73#define CONTROL_MPAGE_LEN 12
  74#define ALL_MPAGES 0x3f
  75#define ALL_SUB_MPAGES 0xff
  76
  77
  78static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
  79        RW_RECOVERY_MPAGE,
  80        RW_RECOVERY_MPAGE_LEN - 2,
  81        (1 << 7),       /* AWRE */
  82        0,              /* read retry count */
  83        0, 0, 0, 0,
  84        0,              /* write retry count */
  85        0, 0, 0
  86};
  87
  88static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
  89        CACHE_MPAGE,
  90        CACHE_MPAGE_LEN - 2,
  91        0,              /* contains WCE, needs to be 0 for logic */
  92        0, 0, 0, 0, 0, 0, 0, 0, 0,
  93        0,              /* contains DRA, needs to be 0 for logic */
  94        0, 0, 0, 0, 0, 0, 0
  95};
  96
  97static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
  98        CONTROL_MPAGE,
  99        CONTROL_MPAGE_LEN - 2,
 100        2,      /* DSENSE=0, GLTSD=1 */
 101        0,      /* [QAM+QERR may be 1, see 05-359r1] */
 102        0, 0, 0, 0, 0xff, 0xff,
 103        0, 30   /* extended self test time, see 05-359r1 */
 104};
 105
 106/*
 107 * libata transport template.  libata doesn't do real transport stuff.
 108 * It just needs the eh_timed_out hook.
 109 */
 110static struct scsi_transport_template ata_scsi_transport_template = {
 111        .eh_strategy_handler    = ata_scsi_error,
 112        .eh_timed_out           = ata_scsi_timed_out,
 113        .user_scan              = ata_scsi_user_scan,
 114};
 115
 116
 117static const struct {
 118        enum link_pm    value;
 119        const char      *name;
 120} link_pm_policy[] = {
 121        { NOT_AVAILABLE, "max_performance" },
 122        { MIN_POWER, "min_power" },
 123        { MAX_PERFORMANCE, "max_performance" },
 124        { MEDIUM_POWER, "medium_power" },
 125};
 126
 127static const char *ata_scsi_lpm_get(enum link_pm policy)
 128{
 129        int i;
 130
 131        for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
 132                if (link_pm_policy[i].value == policy)
 133                        return link_pm_policy[i].name;
 134
 135        return NULL;
 136}
 137
 138static ssize_t ata_scsi_lpm_put(struct device *dev,
 139                                struct device_attribute *attr,
 140                                const char *buf, size_t count)
 141{
 142        struct Scsi_Host *shost = class_to_shost(dev);
 143        struct ata_port *ap = ata_shost_to_port(shost);
 144        enum link_pm policy = 0;
 145        int i;
 146
 147        /*
 148         * we are skipping array location 0 on purpose - this
 149         * is because a value of NOT_AVAILABLE is displayed
 150         * to the user as max_performance, but when the user
 151         * writes "max_performance", they actually want the
 152         * value to match MAX_PERFORMANCE.
 153         */
 154        for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
 155                const int len = strlen(link_pm_policy[i].name);
 156                if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
 157                   buf[len] == '\n') {
 158                        policy = link_pm_policy[i].value;
 159                        break;
 160                }
 161        }
 162        if (!policy)
 163                return -EINVAL;
 164
 165        ata_lpm_schedule(ap, policy);
 166        return count;
 167}
 168
 169static ssize_t
 170ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
 171{
 172        struct Scsi_Host *shost = class_to_shost(dev);
 173        struct ata_port *ap = ata_shost_to_port(shost);
 174        const char *policy =
 175                ata_scsi_lpm_get(ap->pm_policy);
 176
 177        if (!policy)
 178                return -EINVAL;
 179
 180        return snprintf(buf, 23, "%s\n", policy);
 181}
 182DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
 183                ata_scsi_lpm_show, ata_scsi_lpm_put);
 184EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
 185
 186static ssize_t ata_scsi_park_show(struct device *device,
 187                                  struct device_attribute *attr, char *buf)
 188{
 189        struct scsi_device *sdev = to_scsi_device(device);
 190        struct ata_port *ap;
 191        struct ata_link *link;
 192        struct ata_device *dev;
 193        unsigned long flags, now;
 194        unsigned int uninitialized_var(msecs);
 195        int rc = 0;
 196
 197        ap = ata_shost_to_port(sdev->host);
 198
 199        spin_lock_irqsave(ap->lock, flags);
 200        dev = ata_scsi_find_dev(ap, sdev);
 201        if (!dev) {
 202                rc = -ENODEV;
 203                goto unlock;
 204        }
 205        if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
 206                rc = -EOPNOTSUPP;
 207                goto unlock;
 208        }
 209
 210        link = dev->link;
 211        now = jiffies;
 212        if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
 213            link->eh_context.unloaded_mask & (1 << dev->devno) &&
 214            time_after(dev->unpark_deadline, now))
 215                msecs = jiffies_to_msecs(dev->unpark_deadline - now);
 216        else
 217                msecs = 0;
 218
 219unlock:
 220        spin_unlock_irq(ap->lock);
 221
 222        return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
 223}
 224
 225static ssize_t ata_scsi_park_store(struct device *device,
 226                                   struct device_attribute *attr,
 227                                   const char *buf, size_t len)
 228{
 229        struct scsi_device *sdev = to_scsi_device(device);
 230        struct ata_port *ap;
 231        struct ata_device *dev;
 232        long int input;
 233        unsigned long flags;
 234        int rc;
 235
 236        rc = strict_strtol(buf, 10, &input);
 237        if (rc || input < -2)
 238                return -EINVAL;
 239        if (input > ATA_TMOUT_MAX_PARK) {
 240                rc = -EOVERFLOW;
 241                input = ATA_TMOUT_MAX_PARK;
 242        }
 243
 244        ap = ata_shost_to_port(sdev->host);
 245
 246        spin_lock_irqsave(ap->lock, flags);
 247        dev = ata_scsi_find_dev(ap, sdev);
 248        if (unlikely(!dev)) {
 249                rc = -ENODEV;
 250                goto unlock;
 251        }
 252        if (dev->class != ATA_DEV_ATA) {
 253                rc = -EOPNOTSUPP;
 254                goto unlock;
 255        }
 256
 257        if (input >= 0) {
 258                if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
 259                        rc = -EOPNOTSUPP;
 260                        goto unlock;
 261                }
 262
 263                dev->unpark_deadline = ata_deadline(jiffies, input);
 264                dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
 265                ata_port_schedule_eh(ap);
 266                complete(&ap->park_req_pending);
 267        } else {
 268                switch (input) {
 269                case -1:
 270                        dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
 271                        break;
 272                case -2:
 273                        dev->flags |= ATA_DFLAG_NO_UNLOAD;
 274                        break;
 275                }
 276        }
 277unlock:
 278        spin_unlock_irqrestore(ap->lock, flags);
 279
 280        return rc ? rc : len;
 281}
 282DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
 283            ata_scsi_park_show, ata_scsi_park_store);
 284EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
 285
 286static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
 287{
 288        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 289
 290        scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
 291}
 292
 293static ssize_t
 294ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
 295                          const char *buf, size_t count)
 296{
 297        struct Scsi_Host *shost = class_to_shost(dev);
 298        struct ata_port *ap = ata_shost_to_port(shost);
 299        if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
 300                return ap->ops->em_store(ap, buf, count);
 301        return -EINVAL;
 302}
 303
 304static ssize_t
 305ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
 306                         char *buf)
 307{
 308        struct Scsi_Host *shost = class_to_shost(dev);
 309        struct ata_port *ap = ata_shost_to_port(shost);
 310
 311        if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
 312                return ap->ops->em_show(ap, buf);
 313        return -EINVAL;
 314}
 315DEVICE_ATTR(em_message, S_IRUGO | S_IWUGO,
 316                ata_scsi_em_message_show, ata_scsi_em_message_store);
 317EXPORT_SYMBOL_GPL(dev_attr_em_message);
 318
 319static ssize_t
 320ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
 321                              char *buf)
 322{
 323        struct Scsi_Host *shost = class_to_shost(dev);
 324        struct ata_port *ap = ata_shost_to_port(shost);
 325
 326        return snprintf(buf, 23, "%d\n", ap->em_message_type);
 327}
 328DEVICE_ATTR(em_message_type, S_IRUGO,
 329                  ata_scsi_em_message_type_show, NULL);
 330EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
 331
 332static ssize_t
 333ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
 334                char *buf)
 335{
 336        struct scsi_device *sdev = to_scsi_device(dev);
 337        struct ata_port *ap = ata_shost_to_port(sdev->host);
 338        struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
 339
 340        if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
 341                return ap->ops->sw_activity_show(atadev, buf);
 342        return -EINVAL;
 343}
 344
 345static ssize_t
 346ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
 347        const char *buf, size_t count)
 348{
 349        struct scsi_device *sdev = to_scsi_device(dev);
 350        struct ata_port *ap = ata_shost_to_port(sdev->host);
 351        struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
 352        enum sw_activity val;
 353        int rc;
 354
 355        if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
 356                val = simple_strtoul(buf, NULL, 0);
 357                switch (val) {
 358                case OFF: case BLINK_ON: case BLINK_OFF:
 359                        rc = ap->ops->sw_activity_store(atadev, val);
 360                        if (!rc)
 361                                return count;
 362                        else
 363                                return rc;
 364                }
 365        }
 366        return -EINVAL;
 367}
 368DEVICE_ATTR(sw_activity, S_IWUGO | S_IRUGO, ata_scsi_activity_show,
 369                        ata_scsi_activity_store);
 370EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
 371
 372struct device_attribute *ata_common_sdev_attrs[] = {
 373        &dev_attr_unload_heads,
 374        NULL
 375};
 376EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
 377
 378static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
 379                                   void (*done)(struct scsi_cmnd *))
 380{
 381        ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
 382        /* "Invalid field in cbd" */
 383        done(cmd);
 384}
 385
 386/**
 387 *      ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
 388 *      @sdev: SCSI device for which BIOS geometry is to be determined
 389 *      @bdev: block device associated with @sdev
 390 *      @capacity: capacity of SCSI device
 391 *      @geom: location to which geometry will be output
 392 *
 393 *      Generic bios head/sector/cylinder calculator
 394 *      used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
 395 *      mapping. Some situations may arise where the disk is not
 396 *      bootable if this is not used.
 397 *
 398 *      LOCKING:
 399 *      Defined by the SCSI layer.  We don't really care.
 400 *
 401 *      RETURNS:
 402 *      Zero.
 403 */
 404int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
 405                       sector_t capacity, int geom[])
 406{
 407        geom[0] = 255;
 408        geom[1] = 63;
 409        sector_div(capacity, 255*63);
 410        geom[2] = capacity;
 411
 412        return 0;
 413}
 414
 415/**
 416 *      ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
 417 *      @sdev: SCSI device to get identify data for
 418 *      @arg: User buffer area for identify data
 419 *
 420 *      LOCKING:
 421 *      Defined by the SCSI layer.  We don't really care.
 422 *
 423 *      RETURNS:
 424 *      Zero on success, negative errno on error.
 425 */
 426static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
 427{
 428        struct ata_port *ap = ata_shost_to_port(sdev->host);
 429        struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
 430        u16 __user *dst = arg;
 431        char buf[40];
 432
 433        if (!dev)
 434                return -ENOMSG;
 435
 436        if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
 437                return -EFAULT;
 438
 439        ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
 440        if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
 441                return -EFAULT;
 442
 443        ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
 444        if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
 445                return -EFAULT;
 446
 447        ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
 448        if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
 449                return -EFAULT;
 450
 451        return 0;
 452}
 453
 454/**
 455 *      ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
 456 *      @scsidev: Device to which we are issuing command
 457 *      @arg: User provided data for issuing command
 458 *
 459 *      LOCKING:
 460 *      Defined by the SCSI layer.  We don't really care.
 461 *
 462 *      RETURNS:
 463 *      Zero on success, negative errno on error.
 464 */
 465int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
 466{
 467        int rc = 0;
 468        u8 scsi_cmd[MAX_COMMAND_SIZE];
 469        u8 args[4], *argbuf = NULL, *sensebuf = NULL;
 470        int argsize = 0;
 471        enum dma_data_direction data_dir;
 472        int cmd_result;
 473
 474        if (arg == NULL)
 475                return -EINVAL;
 476
 477        if (copy_from_user(args, arg, sizeof(args)))
 478                return -EFAULT;
 479
 480        sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
 481        if (!sensebuf)
 482                return -ENOMEM;
 483
 484        memset(scsi_cmd, 0, sizeof(scsi_cmd));
 485
 486        if (args[3]) {
 487                argsize = SECTOR_SIZE * args[3];
 488                argbuf = kmalloc(argsize, GFP_KERNEL);
 489                if (argbuf == NULL) {
 490                        rc = -ENOMEM;
 491                        goto error;
 492                }
 493
 494                scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
 495                scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
 496                                            block count in sector count field */
 497                data_dir = DMA_FROM_DEVICE;
 498        } else {
 499                scsi_cmd[1]  = (3 << 1); /* Non-data */
 500                scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
 501                data_dir = DMA_NONE;
 502        }
 503
 504        scsi_cmd[0] = ATA_16;
 505
 506        scsi_cmd[4] = args[2];
 507        if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
 508                scsi_cmd[6]  = args[3];
 509                scsi_cmd[8]  = args[1];
 510                scsi_cmd[10] = 0x4f;
 511                scsi_cmd[12] = 0xc2;
 512        } else {
 513                scsi_cmd[6]  = args[1];
 514        }
 515        scsi_cmd[14] = args[0];
 516
 517        /* Good values for timeout and retries?  Values below
 518           from scsi_ioctl_send_command() for default case... */
 519        cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
 520                                  sensebuf, (10*HZ), 5, 0);
 521
 522        if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
 523                u8 *desc = sensebuf + 8;
 524                cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 525
 526                /* If we set cc then ATA pass-through will cause a
 527                 * check condition even if no error. Filter that. */
 528                if (cmd_result & SAM_STAT_CHECK_CONDITION) {
 529                        struct scsi_sense_hdr sshdr;
 530                        scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
 531                                             &sshdr);
 532                        if (sshdr.sense_key == 0 &&
 533                            sshdr.asc == 0 && sshdr.ascq == 0)
 534                                cmd_result &= ~SAM_STAT_CHECK_CONDITION;
 535                }
 536
 537                /* Send userspace a few ATA registers (same as drivers/ide) */
 538                if (sensebuf[0] == 0x72 &&      /* format is "descriptor" */
 539                    desc[0] == 0x09) {          /* code is "ATA Descriptor" */
 540                        args[0] = desc[13];     /* status */
 541                        args[1] = desc[3];      /* error */
 542                        args[2] = desc[5];      /* sector count (0:7) */
 543                        if (copy_to_user(arg, args, sizeof(args)))
 544                                rc = -EFAULT;
 545                }
 546        }
 547
 548
 549        if (cmd_result) {
 550                rc = -EIO;
 551                goto error;
 552        }
 553
 554        if ((argbuf)
 555         && copy_to_user(arg + sizeof(args), argbuf, argsize))
 556                rc = -EFAULT;
 557error:
 558        kfree(sensebuf);
 559        kfree(argbuf);
 560        return rc;
 561}
 562
 563/**
 564 *      ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
 565 *      @scsidev: Device to which we are issuing command
 566 *      @arg: User provided data for issuing command
 567 *
 568 *      LOCKING:
 569 *      Defined by the SCSI layer.  We don't really care.
 570 *
 571 *      RETURNS:
 572 *      Zero on success, negative errno on error.
 573 */
 574int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
 575{
 576        int rc = 0;
 577        u8 scsi_cmd[MAX_COMMAND_SIZE];
 578        u8 args[7], *sensebuf = NULL;
 579        int cmd_result;
 580
 581        if (arg == NULL)
 582                return -EINVAL;
 583
 584        if (copy_from_user(args, arg, sizeof(args)))
 585                return -EFAULT;
 586
 587        sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
 588        if (!sensebuf)
 589                return -ENOMEM;
 590
 591        memset(scsi_cmd, 0, sizeof(scsi_cmd));
 592        scsi_cmd[0]  = ATA_16;
 593        scsi_cmd[1]  = (3 << 1); /* Non-data */
 594        scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
 595        scsi_cmd[4]  = args[1];
 596        scsi_cmd[6]  = args[2];
 597        scsi_cmd[8]  = args[3];
 598        scsi_cmd[10] = args[4];
 599        scsi_cmd[12] = args[5];
 600        scsi_cmd[13] = args[6] & 0x4f;
 601        scsi_cmd[14] = args[0];
 602
 603        /* Good values for timeout and retries?  Values below
 604           from scsi_ioctl_send_command() for default case... */
 605        cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
 606                                sensebuf, (10*HZ), 5, 0);
 607
 608        if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
 609                u8 *desc = sensebuf + 8;
 610                cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 611
 612                /* If we set cc then ATA pass-through will cause a
 613                 * check condition even if no error. Filter that. */
 614                if (cmd_result & SAM_STAT_CHECK_CONDITION) {
 615                        struct scsi_sense_hdr sshdr;
 616                        scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
 617                                                &sshdr);
 618                        if (sshdr.sense_key == 0 &&
 619                                sshdr.asc == 0 && sshdr.ascq == 0)
 620                                cmd_result &= ~SAM_STAT_CHECK_CONDITION;
 621                }
 622
 623                /* Send userspace ATA registers */
 624                if (sensebuf[0] == 0x72 &&      /* format is "descriptor" */
 625                                desc[0] == 0x09) {/* code is "ATA Descriptor" */
 626                        args[0] = desc[13];     /* status */
 627                        args[1] = desc[3];      /* error */
 628                        args[2] = desc[5];      /* sector count (0:7) */
 629                        args[3] = desc[7];      /* lbal */
 630                        args[4] = desc[9];      /* lbam */
 631                        args[5] = desc[11];     /* lbah */
 632                        args[6] = desc[12];     /* select */
 633                        if (copy_to_user(arg, args, sizeof(args)))
 634                                rc = -EFAULT;
 635                }
 636        }
 637
 638        if (cmd_result) {
 639                rc = -EIO;
 640                goto error;
 641        }
 642
 643 error:
 644        kfree(sensebuf);
 645        return rc;
 646}
 647
 648int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
 649{
 650        int val = -EINVAL, rc = -EINVAL;
 651
 652        switch (cmd) {
 653        case ATA_IOC_GET_IO32:
 654                val = 0;
 655                if (copy_to_user(arg, &val, 1))
 656                        return -EFAULT;
 657                return 0;
 658
 659        case ATA_IOC_SET_IO32:
 660                val = (unsigned long) arg;
 661                if (val != 0)
 662                        return -EINVAL;
 663                return 0;
 664
 665        case HDIO_GET_IDENTITY:
 666                return ata_get_identity(scsidev, arg);
 667
 668        case HDIO_DRIVE_CMD:
 669                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 670                        return -EACCES;
 671                return ata_cmd_ioctl(scsidev, arg);
 672
 673        case HDIO_DRIVE_TASK:
 674                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 675                        return -EACCES;
 676                return ata_task_ioctl(scsidev, arg);
 677
 678        default:
 679                rc = -ENOTTY;
 680                break;
 681        }
 682
 683        return rc;
 684}
 685
 686/**
 687 *      ata_scsi_qc_new - acquire new ata_queued_cmd reference
 688 *      @dev: ATA device to which the new command is attached
 689 *      @cmd: SCSI command that originated this ATA command
 690 *      @done: SCSI command completion function
 691 *
 692 *      Obtain a reference to an unused ata_queued_cmd structure,
 693 *      which is the basic libata structure representing a single
 694 *      ATA command sent to the hardware.
 695 *
 696 *      If a command was available, fill in the SCSI-specific
 697 *      portions of the structure with information on the
 698 *      current command.
 699 *
 700 *      LOCKING:
 701 *      spin_lock_irqsave(host lock)
 702 *
 703 *      RETURNS:
 704 *      Command allocated, or %NULL if none available.
 705 */
 706static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
 707                                              struct scsi_cmnd *cmd,
 708                                              void (*done)(struct scsi_cmnd *))
 709{
 710        struct ata_queued_cmd *qc;
 711
 712        qc = ata_qc_new_init(dev);
 713        if (qc) {
 714                qc->scsicmd = cmd;
 715                qc->scsidone = done;
 716
 717                qc->sg = scsi_sglist(cmd);
 718                qc->n_elem = scsi_sg_count(cmd);
 719        } else {
 720                cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
 721                done(cmd);
 722        }
 723
 724        return qc;
 725}
 726
 727static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
 728{
 729        struct scsi_cmnd *scmd = qc->scsicmd;
 730
 731        qc->extrabytes = scmd->request->extra_len;
 732        qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
 733}
 734
 735/**
 736 *      ata_dump_status - user friendly display of error info
 737 *      @id: id of the port in question
 738 *      @tf: ptr to filled out taskfile
 739 *
 740 *      Decode and dump the ATA error/status registers for the user so
 741 *      that they have some idea what really happened at the non
 742 *      make-believe layer.
 743 *
 744 *      LOCKING:
 745 *      inherited from caller
 746 */
 747static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
 748{
 749        u8 stat = tf->command, err = tf->feature;
 750
 751        printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
 752        if (stat & ATA_BUSY) {
 753                printk("Busy }\n");     /* Data is not valid in this case */
 754        } else {
 755                if (stat & 0x40)        printk("DriveReady ");
 756                if (stat & 0x20)        printk("DeviceFault ");
 757                if (stat & 0x10)        printk("SeekComplete ");
 758                if (stat & 0x08)        printk("DataRequest ");
 759                if (stat & 0x04)        printk("CorrectedError ");
 760                if (stat & 0x02)        printk("Index ");
 761                if (stat & 0x01)        printk("Error ");
 762                printk("}\n");
 763
 764                if (err) {
 765                        printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
 766                        if (err & 0x04)         printk("DriveStatusError ");
 767                        if (err & 0x80) {
 768                                if (err & 0x04) printk("BadCRC ");
 769                                else            printk("Sector ");
 770                        }
 771                        if (err & 0x40)         printk("UncorrectableError ");
 772                        if (err & 0x10)         printk("SectorIdNotFound ");
 773                        if (err & 0x02)         printk("TrackZeroNotFound ");
 774                        if (err & 0x01)         printk("AddrMarkNotFound ");
 775                        printk("}\n");
 776                }
 777        }
 778}
 779
 780/**
 781 *      ata_to_sense_error - convert ATA error to SCSI error
 782 *      @id: ATA device number
 783 *      @drv_stat: value contained in ATA status register
 784 *      @drv_err: value contained in ATA error register
 785 *      @sk: the sense key we'll fill out
 786 *      @asc: the additional sense code we'll fill out
 787 *      @ascq: the additional sense code qualifier we'll fill out
 788 *      @verbose: be verbose
 789 *
 790 *      Converts an ATA error into a SCSI error.  Fill out pointers to
 791 *      SK, ASC, and ASCQ bytes for later use in fixed or descriptor
 792 *      format sense blocks.
 793 *
 794 *      LOCKING:
 795 *      spin_lock_irqsave(host lock)
 796 */
 797static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
 798                               u8 *asc, u8 *ascq, int verbose)
 799{
 800        int i;
 801
 802        /* Based on the 3ware driver translation table */
 803        static const unsigned char sense_table[][4] = {
 804                /* BBD|ECC|ID|MAR */
 805                {0xd1,          ABORTED_COMMAND, 0x00, 0x00},   // Device busy                  Aborted command
 806                /* BBD|ECC|ID */
 807                {0xd0,          ABORTED_COMMAND, 0x00, 0x00},   // Device busy                  Aborted command
 808                /* ECC|MC|MARK */
 809                {0x61,          HARDWARE_ERROR, 0x00, 0x00},    // Device fault                 Hardware error
 810                /* ICRC|ABRT */         /* NB: ICRC & !ABRT is BBD */
 811                {0x84,          ABORTED_COMMAND, 0x47, 0x00},   // Data CRC error               SCSI parity error
 812                /* MC|ID|ABRT|TRK0|MARK */
 813                {0x37,          NOT_READY, 0x04, 0x00},         // Unit offline                 Not ready
 814                /* MCR|MARK */
 815                {0x09,          NOT_READY, 0x04, 0x00},         // Unrecovered disk error       Not ready
 816                /*  Bad address mark */
 817                {0x01,          MEDIUM_ERROR, 0x13, 0x00},      // Address mark not found       Address mark not found for data field
 818                /* TRK0 */
 819                {0x02,          HARDWARE_ERROR, 0x00, 0x00},    // Track 0 not found              Hardware error
 820                /* Abort & !ICRC */
 821                {0x04,          ABORTED_COMMAND, 0x00, 0x00},   // Aborted command              Aborted command
 822                /* Media change request */
 823                {0x08,          NOT_READY, 0x04, 0x00},         // Media change request   FIXME: faking offline
 824                /* SRV */
 825                {0x10,          ABORTED_COMMAND, 0x14, 0x00},   // ID not found                 Recorded entity not found
 826                /* Media change */
 827                {0x08,          NOT_READY, 0x04, 0x00},         // Media change           FIXME: faking offline
 828                /* ECC */
 829                {0x40,          MEDIUM_ERROR, 0x11, 0x04},      // Uncorrectable ECC error      Unrecovered read error
 830                /* BBD - block marked bad */
 831                {0x80,          MEDIUM_ERROR, 0x11, 0x04},      // Block marked bad               Medium error, unrecovered read error
 832                {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
 833        };
 834        static const unsigned char stat_table[][4] = {
 835                /* Must be first because BUSY means no other bits valid */
 836                {0x80,          ABORTED_COMMAND, 0x47, 0x00},   // Busy, fake parity for now
 837                {0x20,          HARDWARE_ERROR,  0x00, 0x00},   // Device fault
 838                {0x08,          ABORTED_COMMAND, 0x47, 0x00},   // Timed out in xfer, fake parity for now
 839                {0x04,          RECOVERED_ERROR, 0x11, 0x00},   // Recovered ECC error    Medium error, recovered
 840                {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
 841        };
 842
 843        /*
 844         *      Is this an error we can process/parse
 845         */
 846        if (drv_stat & ATA_BUSY) {
 847                drv_err = 0;    /* Ignore the err bits, they're invalid */
 848        }
 849
 850        if (drv_err) {
 851                /* Look for drv_err */
 852                for (i = 0; sense_table[i][0] != 0xFF; i++) {
 853                        /* Look for best matches first */
 854                        if ((sense_table[i][0] & drv_err) ==
 855                            sense_table[i][0]) {
 856                                *sk = sense_table[i][1];
 857                                *asc = sense_table[i][2];
 858                                *ascq = sense_table[i][3];
 859                                goto translate_done;
 860                        }
 861                }
 862                /* No immediate match */
 863                if (verbose)
 864                        printk(KERN_WARNING "ata%u: no sense translation for "
 865                               "error 0x%02x\n", id, drv_err);
 866        }
 867
 868        /* Fall back to interpreting status bits */
 869        for (i = 0; stat_table[i][0] != 0xFF; i++) {
 870                if (stat_table[i][0] & drv_stat) {
 871                        *sk = stat_table[i][1];
 872                        *asc = stat_table[i][2];
 873                        *ascq = stat_table[i][3];
 874                        goto translate_done;
 875                }
 876        }
 877        /* No error?  Undecoded? */
 878        if (verbose)
 879                printk(KERN_WARNING "ata%u: no sense translation for "
 880                       "status: 0x%02x\n", id, drv_stat);
 881
 882        /* We need a sensible error return here, which is tricky, and one
 883           that won't cause people to do things like return a disk wrongly */
 884        *sk = ABORTED_COMMAND;
 885        *asc = 0x00;
 886        *ascq = 0x00;
 887
 888 translate_done:
 889        if (verbose)
 890                printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
 891                       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
 892                       id, drv_stat, drv_err, *sk, *asc, *ascq);
 893        return;
 894}
 895
 896/*
 897 *      ata_gen_passthru_sense - Generate check condition sense block.
 898 *      @qc: Command that completed.
 899 *
 900 *      This function is specific to the ATA descriptor format sense
 901 *      block specified for the ATA pass through commands.  Regardless
 902 *      of whether the command errored or not, return a sense
 903 *      block. Copy all controller registers into the sense
 904 *      block. Clear sense key, ASC & ASCQ if there is no error.
 905 *
 906 *      LOCKING:
 907 *      None.
 908 */
 909static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
 910{
 911        struct scsi_cmnd *cmd = qc->scsicmd;
 912        struct ata_taskfile *tf = &qc->result_tf;
 913        unsigned char *sb = cmd->sense_buffer;
 914        unsigned char *desc = sb + 8;
 915        int verbose = qc->ap->ops->error_handler == NULL;
 916
 917        memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 918
 919        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 920
 921        /*
 922         * Use ata_to_sense_error() to map status register bits
 923         * onto sense key, asc & ascq.
 924         */
 925        if (qc->err_mask ||
 926            tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
 927                ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
 928                                   &sb[1], &sb[2], &sb[3], verbose);
 929                sb[1] &= 0x0f;
 930        }
 931
 932        /*
 933         * Sense data is current and format is descriptor.
 934         */
 935        sb[0] = 0x72;
 936
 937        desc[0] = 0x09;
 938
 939        /* set length of additional sense data */
 940        sb[7] = 14;
 941        desc[1] = 12;
 942
 943        /*
 944         * Copy registers into sense buffer.
 945         */
 946        desc[2] = 0x00;
 947        desc[3] = tf->feature;  /* == error reg */
 948        desc[5] = tf->nsect;
 949        desc[7] = tf->lbal;
 950        desc[9] = tf->lbam;
 951        desc[11] = tf->lbah;
 952        desc[12] = tf->device;
 953        desc[13] = tf->command; /* == status reg */
 954
 955        /*
 956         * Fill in Extend bit, and the high order bytes
 957         * if applicable.
 958         */
 959        if (tf->flags & ATA_TFLAG_LBA48) {
 960                desc[2] |= 0x01;
 961                desc[4] = tf->hob_nsect;
 962                desc[6] = tf->hob_lbal;
 963                desc[8] = tf->hob_lbam;
 964                desc[10] = tf->hob_lbah;
 965        }
 966}
 967
 968/**
 969 *      ata_gen_ata_sense - generate a SCSI fixed sense block
 970 *      @qc: Command that we are erroring out
 971 *
 972 *      Generate sense block for a failed ATA command @qc.  Descriptor
 973 *      format is used to accomodate LBA48 block address.
 974 *
 975 *      LOCKING:
 976 *      None.
 977 */
 978static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
 979{
 980        struct ata_device *dev = qc->dev;
 981        struct scsi_cmnd *cmd = qc->scsicmd;
 982        struct ata_taskfile *tf = &qc->result_tf;
 983        unsigned char *sb = cmd->sense_buffer;
 984        unsigned char *desc = sb + 8;
 985        int verbose = qc->ap->ops->error_handler == NULL;
 986        u64 block;
 987
 988        memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 989
 990        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 991
 992        /* sense data is current and format is descriptor */
 993        sb[0] = 0x72;
 994
 995        /* Use ata_to_sense_error() to map status register bits
 996         * onto sense key, asc & ascq.
 997         */
 998        if (qc->err_mask ||
 999            tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1000                ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1001                                   &sb[1], &sb[2], &sb[3], verbose);
1002                sb[1] &= 0x0f;
1003        }
1004
1005        block = ata_tf_read_block(&qc->result_tf, dev);
1006
1007        /* information sense data descriptor */
1008        sb[7] = 12;
1009        desc[0] = 0x00;
1010        desc[1] = 10;
1011
1012        desc[2] |= 0x80;        /* valid */
1013        desc[6] = block >> 40;
1014        desc[7] = block >> 32;
1015        desc[8] = block >> 24;
1016        desc[9] = block >> 16;
1017        desc[10] = block >> 8;
1018        desc[11] = block;
1019}
1020
1021static void ata_scsi_sdev_config(struct scsi_device *sdev)
1022{
1023        sdev->use_10_for_rw = 1;
1024        sdev->use_10_for_ms = 1;
1025
1026        /* Schedule policy is determined by ->qc_defer() callback and
1027         * it needs to see every deferred qc.  Set dev_blocked to 1 to
1028         * prevent SCSI midlayer from automatically deferring
1029         * requests.
1030         */
1031        sdev->max_device_blocked = 1;
1032}
1033
1034/**
1035 *      atapi_drain_needed - Check whether data transfer may overflow
1036 *      @rq: request to be checked
1037 *
1038 *      ATAPI commands which transfer variable length data to host
1039 *      might overflow due to application error or hardare bug.  This
1040 *      function checks whether overflow should be drained and ignored
1041 *      for @request.
1042 *
1043 *      LOCKING:
1044 *      None.
1045 *
1046 *      RETURNS:
1047 *      1 if ; otherwise, 0.
1048 */
1049static int atapi_drain_needed(struct request *rq)
1050{
1051        if (likely(!blk_pc_request(rq)))
1052                return 0;
1053
1054        if (!rq->data_len || (rq->cmd_flags & REQ_RW))
1055                return 0;
1056
1057        return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1058}
1059
1060static int ata_scsi_dev_config(struct scsi_device *sdev,
1061                               struct ata_device *dev)
1062{
1063        if (!ata_id_has_unload(dev->id))
1064                dev->flags |= ATA_DFLAG_NO_UNLOAD;
1065
1066        /* configure max sectors */
1067        blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
1068
1069        if (dev->class == ATA_DEV_ATAPI) {
1070                struct request_queue *q = sdev->request_queue;
1071                void *buf;
1072
1073                /* set the min alignment and padding */
1074                blk_queue_update_dma_alignment(sdev->request_queue,
1075                                               ATA_DMA_PAD_SZ - 1);
1076                blk_queue_update_dma_pad(sdev->request_queue,
1077                                         ATA_DMA_PAD_SZ - 1);
1078
1079                /* configure draining */
1080                buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1081                if (!buf) {
1082                        ata_dev_printk(dev, KERN_ERR,
1083                                       "drain buffer allocation failed\n");
1084                        return -ENOMEM;
1085                }
1086
1087                blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1088        } else {
1089                if (ata_id_is_ssd(dev->id))
1090                        queue_flag_set_unlocked(QUEUE_FLAG_NONROT,
1091                                                sdev->request_queue);
1092
1093                /* ATA devices must be sector aligned */
1094                blk_queue_update_dma_alignment(sdev->request_queue,
1095                                               ATA_SECT_SIZE - 1);
1096                sdev->manage_start_stop = 1;
1097        }
1098
1099        if (dev->flags & ATA_DFLAG_AN)
1100                set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1101
1102        if (dev->flags & ATA_DFLAG_NCQ) {
1103                int depth;
1104
1105                depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1106                depth = min(ATA_MAX_QUEUE - 1, depth);
1107                scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1108        }
1109
1110        return 0;
1111}
1112
1113/**
1114 *      ata_scsi_slave_config - Set SCSI device attributes
1115 *      @sdev: SCSI device to examine
1116 *
1117 *      This is called before we actually start reading
1118 *      and writing to the device, to configure certain
1119 *      SCSI mid-layer behaviors.
1120 *
1121 *      LOCKING:
1122 *      Defined by SCSI layer.  We don't really care.
1123 */
1124
1125int ata_scsi_slave_config(struct scsi_device *sdev)
1126{
1127        struct ata_port *ap = ata_shost_to_port(sdev->host);
1128        struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1129        int rc = 0;
1130
1131        ata_scsi_sdev_config(sdev);
1132
1133        if (dev)
1134                rc = ata_scsi_dev_config(sdev, dev);
1135
1136        return rc;
1137}
1138
1139/**
1140 *      ata_scsi_slave_destroy - SCSI device is about to be destroyed
1141 *      @sdev: SCSI device to be destroyed
1142 *
1143 *      @sdev is about to be destroyed for hot/warm unplugging.  If
1144 *      this unplugging was initiated by libata as indicated by NULL
1145 *      dev->sdev, this function doesn't have to do anything.
1146 *      Otherwise, SCSI layer initiated warm-unplug is in progress.
1147 *      Clear dev->sdev, schedule the device for ATA detach and invoke
1148 *      EH.
1149 *
1150 *      LOCKING:
1151 *      Defined by SCSI layer.  We don't really care.
1152 */
1153void ata_scsi_slave_destroy(struct scsi_device *sdev)
1154{
1155        struct ata_port *ap = ata_shost_to_port(sdev->host);
1156        struct request_queue *q = sdev->request_queue;
1157        unsigned long flags;
1158        struct ata_device *dev;
1159
1160        if (!ap->ops->error_handler)
1161                return;
1162
1163        spin_lock_irqsave(ap->lock, flags);
1164        dev = __ata_scsi_find_dev(ap, sdev);
1165        if (dev && dev->sdev) {
1166                /* SCSI device already in CANCEL state, no need to offline it */
1167                dev->sdev = NULL;
1168                dev->flags |= ATA_DFLAG_DETACH;
1169                ata_port_schedule_eh(ap);
1170        }
1171        spin_unlock_irqrestore(ap->lock, flags);
1172
1173        kfree(q->dma_drain_buffer);
1174        q->dma_drain_buffer = NULL;
1175        q->dma_drain_size = 0;
1176}
1177
1178/**
1179 *      ata_scsi_change_queue_depth - SCSI callback for queue depth config
1180 *      @sdev: SCSI device to configure queue depth for
1181 *      @queue_depth: new queue depth
1182 *
1183 *      This is libata standard hostt->change_queue_depth callback.
1184 *      SCSI will call into this callback when user tries to set queue
1185 *      depth via sysfs.
1186 *
1187 *      LOCKING:
1188 *      SCSI layer (we don't care)
1189 *
1190 *      RETURNS:
1191 *      Newly configured queue depth.
1192 */
1193int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1194{
1195        struct ata_port *ap = ata_shost_to_port(sdev->host);
1196        struct ata_device *dev;
1197        unsigned long flags;
1198
1199        if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1200                return sdev->queue_depth;
1201
1202        dev = ata_scsi_find_dev(ap, sdev);
1203        if (!dev || !ata_dev_enabled(dev))
1204                return sdev->queue_depth;
1205
1206        /* NCQ enabled? */
1207        spin_lock_irqsave(ap->lock, flags);
1208        dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1209        if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1210                dev->flags |= ATA_DFLAG_NCQ_OFF;
1211                queue_depth = 1;
1212        }
1213        spin_unlock_irqrestore(ap->lock, flags);
1214
1215        /* limit and apply queue depth */
1216        queue_depth = min(queue_depth, sdev->host->can_queue);
1217        queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1218        queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1219
1220        if (sdev->queue_depth == queue_depth)
1221                return -EINVAL;
1222
1223        scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1224        return queue_depth;
1225}
1226
1227/* XXX: for spindown warning */
1228static void ata_delayed_done_timerfn(unsigned long arg)
1229{
1230        struct scsi_cmnd *scmd = (void *)arg;
1231
1232        scmd->scsi_done(scmd);
1233}
1234
1235/* XXX: for spindown warning */
1236static void ata_delayed_done(struct scsi_cmnd *scmd)
1237{
1238        static struct timer_list timer;
1239
1240        setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1241        mod_timer(&timer, jiffies + 5 * HZ);
1242}
1243
1244/**
1245 *      ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1246 *      @qc: Storage for translated ATA taskfile
1247 *
1248 *      Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1249 *      (to start). Perhaps these commands should be preceded by
1250 *      CHECK POWER MODE to see what power mode the device is already in.
1251 *      [See SAT revision 5 at www.t10.org]
1252 *
1253 *      LOCKING:
1254 *      spin_lock_irqsave(host lock)
1255 *
1256 *      RETURNS:
1257 *      Zero on success, non-zero on error.
1258 */
1259static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1260{
1261        struct scsi_cmnd *scmd = qc->scsicmd;
1262        struct ata_taskfile *tf = &qc->tf;
1263        const u8 *cdb = scmd->cmnd;
1264
1265        if (scmd->cmd_len < 5)
1266                goto invalid_fld;
1267
1268        tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1269        tf->protocol = ATA_PROT_NODATA;
1270        if (cdb[1] & 0x1) {
1271                ;       /* ignore IMMED bit, violates sat-r05 */
1272        }
1273        if (cdb[4] & 0x2)
1274                goto invalid_fld;       /* LOEJ bit set not supported */
1275        if (((cdb[4] >> 4) & 0xf) != 0)
1276                goto invalid_fld;       /* power conditions not supported */
1277
1278        if (cdb[4] & 0x1) {
1279                tf->nsect = 1;  /* 1 sector, lba=0 */
1280
1281                if (qc->dev->flags & ATA_DFLAG_LBA) {
1282                        tf->flags |= ATA_TFLAG_LBA;
1283
1284                        tf->lbah = 0x0;
1285                        tf->lbam = 0x0;
1286                        tf->lbal = 0x0;
1287                        tf->device |= ATA_LBA;
1288                } else {
1289                        /* CHS */
1290                        tf->lbal = 0x1; /* sect */
1291                        tf->lbam = 0x0; /* cyl low */
1292                        tf->lbah = 0x0; /* cyl high */
1293                }
1294
1295                tf->command = ATA_CMD_VERIFY;   /* READ VERIFY */
1296        } else {
1297                /* XXX: This is for backward compatibility, will be
1298                 * removed.  Read Documentation/feature-removal-schedule.txt
1299                 * for more info.
1300                 */
1301                if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
1302                    (system_state == SYSTEM_HALT ||
1303                     system_state == SYSTEM_POWER_OFF)) {
1304                        static unsigned long warned;
1305
1306                        if (!test_and_set_bit(0, &warned)) {
1307                                ata_dev_printk(qc->dev, KERN_WARNING,
1308                                        "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1309                                        "UPDATE SHUTDOWN UTILITY\n");
1310                                ata_dev_printk(qc->dev, KERN_WARNING,
1311                                        "For more info, visit "
1312                                        "http://linux-ata.org/shutdown.html\n");
1313
1314                                /* ->scsi_done is not used, use it for
1315                                 * delayed completion.
1316                                 */
1317                                scmd->scsi_done = qc->scsidone;
1318                                qc->scsidone = ata_delayed_done;
1319                        }
1320                        scmd->result = SAM_STAT_GOOD;
1321                        return 1;
1322                }
1323
1324                /* Issue ATA STANDBY IMMEDIATE command */
1325                tf->command = ATA_CMD_STANDBYNOW1;
1326        }
1327
1328        /*
1329         * Standby and Idle condition timers could be implemented but that
1330         * would require libata to implement the Power condition mode page
1331         * and allow the user to change it. Changing mode pages requires
1332         * MODE SELECT to be implemented.
1333         */
1334
1335        return 0;
1336
1337invalid_fld:
1338        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1339        /* "Invalid field in cbd" */
1340        return 1;
1341}
1342
1343
1344/**
1345 *      ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1346 *      @qc: Storage for translated ATA taskfile
1347 *
1348 *      Sets up an ATA taskfile to issue FLUSH CACHE or
1349 *      FLUSH CACHE EXT.
1350 *
1351 *      LOCKING:
1352 *      spin_lock_irqsave(host lock)
1353 *
1354 *      RETURNS:
1355 *      Zero on success, non-zero on error.
1356 */
1357static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1358{
1359        struct ata_taskfile *tf = &qc->tf;
1360
1361        tf->flags |= ATA_TFLAG_DEVICE;
1362        tf->protocol = ATA_PROT_NODATA;
1363
1364        if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1365                tf->command = ATA_CMD_FLUSH_EXT;
1366        else
1367                tf->command = ATA_CMD_FLUSH;
1368
1369        /* flush is critical for IO integrity, consider it an IO command */
1370        qc->flags |= ATA_QCFLAG_IO;
1371
1372        return 0;
1373}
1374
1375/**
1376 *      scsi_6_lba_len - Get LBA and transfer length
1377 *      @cdb: SCSI command to translate
1378 *
1379 *      Calculate LBA and transfer length for 6-byte commands.
1380 *
1381 *      RETURNS:
1382 *      @plba: the LBA
1383 *      @plen: the transfer length
1384 */
1385static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1386{
1387        u64 lba = 0;
1388        u32 len;
1389
1390        VPRINTK("six-byte command\n");
1391
1392        lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1393        lba |= ((u64)cdb[2]) << 8;
1394        lba |= ((u64)cdb[3]);
1395
1396        len = cdb[4];
1397
1398        *plba = lba;
1399        *plen = len;
1400}
1401
1402/**
1403 *      scsi_10_lba_len - Get LBA and transfer length
1404 *      @cdb: SCSI command to translate
1405 *
1406 *      Calculate LBA and transfer length for 10-byte commands.
1407 *
1408 *      RETURNS:
1409 *      @plba: the LBA
1410 *      @plen: the transfer length
1411 */
1412static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1413{
1414        u64 lba = 0;
1415        u32 len = 0;
1416
1417        VPRINTK("ten-byte command\n");
1418
1419        lba |= ((u64)cdb[2]) << 24;
1420        lba |= ((u64)cdb[3]) << 16;
1421        lba |= ((u64)cdb[4]) << 8;
1422        lba |= ((u64)cdb[5]);
1423
1424        len |= ((u32)cdb[7]) << 8;
1425        len |= ((u32)cdb[8]);
1426
1427        *plba = lba;
1428        *plen = len;
1429}
1430
1431/**
1432 *      scsi_16_lba_len - Get LBA and transfer length
1433 *      @cdb: SCSI command to translate
1434 *
1435 *      Calculate LBA and transfer length for 16-byte commands.
1436 *
1437 *      RETURNS:
1438 *      @plba: the LBA
1439 *      @plen: the transfer length
1440 */
1441static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1442{
1443        u64 lba = 0;
1444        u32 len = 0;
1445
1446        VPRINTK("sixteen-byte command\n");
1447
1448        lba |= ((u64)cdb[2]) << 56;
1449        lba |= ((u64)cdb[3]) << 48;
1450        lba |= ((u64)cdb[4]) << 40;
1451        lba |= ((u64)cdb[5]) << 32;
1452        lba |= ((u64)cdb[6]) << 24;
1453        lba |= ((u64)cdb[7]) << 16;
1454        lba |= ((u64)cdb[8]) << 8;
1455        lba |= ((u64)cdb[9]);
1456
1457        len |= ((u32)cdb[10]) << 24;
1458        len |= ((u32)cdb[11]) << 16;
1459        len |= ((u32)cdb[12]) << 8;
1460        len |= ((u32)cdb[13]);
1461
1462        *plba = lba;
1463        *plen = len;
1464}
1465
1466/**
1467 *      ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1468 *      @qc: Storage for translated ATA taskfile
1469 *
1470 *      Converts SCSI VERIFY command to an ATA READ VERIFY command.
1471 *
1472 *      LOCKING:
1473 *      spin_lock_irqsave(host lock)
1474 *
1475 *      RETURNS:
1476 *      Zero on success, non-zero on error.
1477 */
1478static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1479{
1480        struct scsi_cmnd *scmd = qc->scsicmd;
1481        struct ata_taskfile *tf = &qc->tf;
1482        struct ata_device *dev = qc->dev;
1483        u64 dev_sectors = qc->dev->n_sectors;
1484        const u8 *cdb = scmd->cmnd;
1485        u64 block;
1486        u32 n_block;
1487
1488        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1489        tf->protocol = ATA_PROT_NODATA;
1490
1491        if (cdb[0] == VERIFY) {
1492                if (scmd->cmd_len < 10)
1493                        goto invalid_fld;
1494                scsi_10_lba_len(cdb, &block, &n_block);
1495        } else if (cdb[0] == VERIFY_16) {
1496                if (scmd->cmd_len < 16)
1497                        goto invalid_fld;
1498                scsi_16_lba_len(cdb, &block, &n_block);
1499        } else
1500                goto invalid_fld;
1501
1502        if (!n_block)
1503                goto nothing_to_do;
1504        if (block >= dev_sectors)
1505                goto out_of_range;
1506        if ((block + n_block) > dev_sectors)
1507                goto out_of_range;
1508
1509        if (dev->flags & ATA_DFLAG_LBA) {
1510                tf->flags |= ATA_TFLAG_LBA;
1511
1512                if (lba_28_ok(block, n_block)) {
1513                        /* use LBA28 */
1514                        tf->command = ATA_CMD_VERIFY;
1515                        tf->device |= (block >> 24) & 0xf;
1516                } else if (lba_48_ok(block, n_block)) {
1517                        if (!(dev->flags & ATA_DFLAG_LBA48))
1518                                goto out_of_range;
1519
1520                        /* use LBA48 */
1521                        tf->flags |= ATA_TFLAG_LBA48;
1522                        tf->command = ATA_CMD_VERIFY_EXT;
1523
1524                        tf->hob_nsect = (n_block >> 8) & 0xff;
1525
1526                        tf->hob_lbah = (block >> 40) & 0xff;
1527                        tf->hob_lbam = (block >> 32) & 0xff;
1528                        tf->hob_lbal = (block >> 24) & 0xff;
1529                } else
1530                        /* request too large even for LBA48 */
1531                        goto out_of_range;
1532
1533                tf->nsect = n_block & 0xff;
1534
1535                tf->lbah = (block >> 16) & 0xff;
1536                tf->lbam = (block >> 8) & 0xff;
1537                tf->lbal = block & 0xff;
1538
1539                tf->device |= ATA_LBA;
1540        } else {
1541                /* CHS */
1542                u32 sect, head, cyl, track;
1543
1544                if (!lba_28_ok(block, n_block))
1545                        goto out_of_range;
1546
1547                /* Convert LBA to CHS */
1548                track = (u32)block / dev->sectors;
1549                cyl   = track / dev->heads;
1550                head  = track % dev->heads;
1551                sect  = (u32)block % dev->sectors + 1;
1552
1553                DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1554                        (u32)block, track, cyl, head, sect);
1555
1556                /* Check whether the converted CHS can fit.
1557                   Cylinder: 0-65535
1558                   Head: 0-15
1559                   Sector: 1-255*/
1560                if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1561                        goto out_of_range;
1562
1563                tf->command = ATA_CMD_VERIFY;
1564                tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1565                tf->lbal = sect;
1566                tf->lbam = cyl;
1567                tf->lbah = cyl >> 8;
1568                tf->device |= head;
1569        }
1570
1571        return 0;
1572
1573invalid_fld:
1574        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1575        /* "Invalid field in cbd" */
1576        return 1;
1577
1578out_of_range:
1579        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1580        /* "Logical Block Address out of range" */
1581        return 1;
1582
1583nothing_to_do:
1584        scmd->result = SAM_STAT_GOOD;
1585        return 1;
1586}
1587
1588/**
1589 *      ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1590 *      @qc: Storage for translated ATA taskfile
1591 *
1592 *      Converts any of six SCSI read/write commands into the
1593 *      ATA counterpart, including starting sector (LBA),
1594 *      sector count, and taking into account the device's LBA48
1595 *      support.
1596 *
1597 *      Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1598 *      %WRITE_16 are currently supported.
1599 *
1600 *      LOCKING:
1601 *      spin_lock_irqsave(host lock)
1602 *
1603 *      RETURNS:
1604 *      Zero on success, non-zero on error.
1605 */
1606static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1607{
1608        struct scsi_cmnd *scmd = qc->scsicmd;
1609        const u8 *cdb = scmd->cmnd;
1610        unsigned int tf_flags = 0;
1611        u64 block;
1612        u32 n_block;
1613        int rc;
1614
1615        if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1616                tf_flags |= ATA_TFLAG_WRITE;
1617
1618        /* Calculate the SCSI LBA, transfer length and FUA. */
1619        switch (cdb[0]) {
1620        case READ_10:
1621        case WRITE_10:
1622                if (unlikely(scmd->cmd_len < 10))
1623                        goto invalid_fld;
1624                scsi_10_lba_len(cdb, &block, &n_block);
1625                if (unlikely(cdb[1] & (1 << 3)))
1626                        tf_flags |= ATA_TFLAG_FUA;
1627                break;
1628        case READ_6:
1629        case WRITE_6:
1630                if (unlikely(scmd->cmd_len < 6))
1631                        goto invalid_fld;
1632                scsi_6_lba_len(cdb, &block, &n_block);
1633
1634                /* for 6-byte r/w commands, transfer length 0
1635                 * means 256 blocks of data, not 0 block.
1636                 */
1637                if (!n_block)
1638                        n_block = 256;
1639                break;
1640        case READ_16:
1641        case WRITE_16:
1642                if (unlikely(scmd->cmd_len < 16))
1643                        goto invalid_fld;
1644                scsi_16_lba_len(cdb, &block, &n_block);
1645                if (unlikely(cdb[1] & (1 << 3)))
1646                        tf_flags |= ATA_TFLAG_FUA;
1647                break;
1648        default:
1649                DPRINTK("no-byte command\n");
1650                goto invalid_fld;
1651        }
1652
1653        /* Check and compose ATA command */
1654        if (!n_block)
1655                /* For 10-byte and 16-byte SCSI R/W commands, transfer
1656                 * length 0 means transfer 0 block of data.
1657                 * However, for ATA R/W commands, sector count 0 means
1658                 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1659                 *
1660                 * WARNING: one or two older ATA drives treat 0 as 0...
1661                 */
1662                goto nothing_to_do;
1663
1664        qc->flags |= ATA_QCFLAG_IO;
1665        qc->nbytes = n_block * ATA_SECT_SIZE;
1666
1667        rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1668                             qc->tag);
1669        if (likely(rc == 0))
1670                return 0;
1671
1672        if (rc == -ERANGE)
1673                goto out_of_range;
1674        /* treat all other errors as -EINVAL, fall through */
1675invalid_fld:
1676        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1677        /* "Invalid field in cbd" */
1678        return 1;
1679
1680out_of_range:
1681        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1682        /* "Logical Block Address out of range" */
1683        return 1;
1684
1685nothing_to_do:
1686        scmd->result = SAM_STAT_GOOD;
1687        return 1;
1688}
1689
1690static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1691{
1692        struct ata_port *ap = qc->ap;
1693        struct scsi_cmnd *cmd = qc->scsicmd;
1694        u8 *cdb = cmd->cmnd;
1695        int need_sense = (qc->err_mask != 0);
1696
1697        /* For ATA pass thru (SAT) commands, generate a sense block if
1698         * user mandated it or if there's an error.  Note that if we
1699         * generate because the user forced us to, a check condition
1700         * is generated and the ATA register values are returned
1701         * whether the command completed successfully or not. If there
1702         * was no error, SK, ASC and ASCQ will all be zero.
1703         */
1704        if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1705            ((cdb[2] & 0x20) || need_sense)) {
1706                ata_gen_passthru_sense(qc);
1707        } else {
1708                if (!need_sense) {
1709                        cmd->result = SAM_STAT_GOOD;
1710                } else {
1711                        /* TODO: decide which descriptor format to use
1712                         * for 48b LBA devices and call that here
1713                         * instead of the fixed desc, which is only
1714                         * good for smaller LBA (and maybe CHS?)
1715                         * devices.
1716                         */
1717                        ata_gen_ata_sense(qc);
1718                }
1719        }
1720
1721        /* XXX: track spindown state for spindown skipping and warning */
1722        if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1723                     qc->tf.command == ATA_CMD_STANDBYNOW1))
1724                qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1725        else if (likely(system_state != SYSTEM_HALT &&
1726                        system_state != SYSTEM_POWER_OFF))
1727                qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1728
1729        if (need_sense && !ap->ops->error_handler)
1730                ata_dump_status(ap->print_id, &qc->result_tf);
1731
1732        qc->scsidone(cmd);
1733
1734        ata_qc_free(qc);
1735}
1736
1737/**
1738 *      ata_scsi_translate - Translate then issue SCSI command to ATA device
1739 *      @dev: ATA device to which the command is addressed
1740 *      @cmd: SCSI command to execute
1741 *      @done: SCSI command completion function
1742 *      @xlat_func: Actor which translates @cmd to an ATA taskfile
1743 *
1744 *      Our ->queuecommand() function has decided that the SCSI
1745 *      command issued can be directly translated into an ATA
1746 *      command, rather than handled internally.
1747 *
1748 *      This function sets up an ata_queued_cmd structure for the
1749 *      SCSI command, and sends that ata_queued_cmd to the hardware.
1750 *
1751 *      The xlat_func argument (actor) returns 0 if ready to execute
1752 *      ATA command, else 1 to finish translation. If 1 is returned
1753 *      then cmd->result (and possibly cmd->sense_buffer) are assumed
1754 *      to be set reflecting an error condition or clean (early)
1755 *      termination.
1756 *
1757 *      LOCKING:
1758 *      spin_lock_irqsave(host lock)
1759 *
1760 *      RETURNS:
1761 *      0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1762 *      needs to be deferred.
1763 */
1764static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1765                              void (*done)(struct scsi_cmnd *),
1766                              ata_xlat_func_t xlat_func)
1767{
1768        struct ata_port *ap = dev->link->ap;
1769        struct ata_queued_cmd *qc;
1770        int rc;
1771
1772        VPRINTK("ENTER\n");
1773
1774        qc = ata_scsi_qc_new(dev, cmd, done);
1775        if (!qc)
1776                goto err_mem;
1777
1778        /* data is present; dma-map it */
1779        if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1780            cmd->sc_data_direction == DMA_TO_DEVICE) {
1781                if (unlikely(scsi_bufflen(cmd) < 1)) {
1782                        ata_dev_printk(dev, KERN_WARNING,
1783                                       "WARNING: zero len r/w req\n");
1784                        goto err_did;
1785                }
1786
1787                ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1788
1789                qc->dma_dir = cmd->sc_data_direction;
1790        }
1791
1792        qc->complete_fn = ata_scsi_qc_complete;
1793
1794        if (xlat_func(qc))
1795                goto early_finish;
1796
1797        if (ap->ops->qc_defer) {
1798                if ((rc = ap->ops->qc_defer(qc)))
1799                        goto defer;
1800        }
1801
1802        /* select device, send command to hardware */
1803        ata_qc_issue(qc);
1804
1805        VPRINTK("EXIT\n");
1806        return 0;
1807
1808early_finish:
1809        ata_qc_free(qc);
1810        qc->scsidone(cmd);
1811        DPRINTK("EXIT - early finish (good or error)\n");
1812        return 0;
1813
1814err_did:
1815        ata_qc_free(qc);
1816        cmd->result = (DID_ERROR << 16);
1817        qc->scsidone(cmd);
1818err_mem:
1819        DPRINTK("EXIT - internal\n");
1820        return 0;
1821
1822defer:
1823        ata_qc_free(qc);
1824        DPRINTK("EXIT - defer\n");
1825        if (rc == ATA_DEFER_LINK)
1826                return SCSI_MLQUEUE_DEVICE_BUSY;
1827        else
1828                return SCSI_MLQUEUE_HOST_BUSY;
1829}
1830
1831/**
1832 *      ata_scsi_rbuf_get - Map response buffer.
1833 *      @cmd: SCSI command containing buffer to be mapped.
1834 *      @flags: unsigned long variable to store irq enable status
1835 *      @copy_in: copy in from user buffer
1836 *
1837 *      Prepare buffer for simulated SCSI commands.
1838 *
1839 *      LOCKING:
1840 *      spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1841 *
1842 *      RETURNS:
1843 *      Pointer to response buffer.
1844 */
1845static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1846                               unsigned long *flags)
1847{
1848        spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1849
1850        memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1851        if (copy_in)
1852                sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1853                                  ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1854        return ata_scsi_rbuf;
1855}
1856
1857/**
1858 *      ata_scsi_rbuf_put - Unmap response buffer.
1859 *      @cmd: SCSI command containing buffer to be unmapped.
1860 *      @copy_out: copy out result
1861 *      @flags: @flags passed to ata_scsi_rbuf_get()
1862 *
1863 *      Returns rbuf buffer.  The result is copied to @cmd's buffer if
1864 *      @copy_back is true.
1865 *
1866 *      LOCKING:
1867 *      Unlocks ata_scsi_rbuf_lock.
1868 */
1869static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1870                                     unsigned long *flags)
1871{
1872        if (copy_out)
1873                sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1874                                    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1875        spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1876}
1877
1878/**
1879 *      ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1880 *      @args: device IDENTIFY data / SCSI command of interest.
1881 *      @actor: Callback hook for desired SCSI command simulator
1882 *
1883 *      Takes care of the hard work of simulating a SCSI command...
1884 *      Mapping the response buffer, calling the command's handler,
1885 *      and handling the handler's return value.  This return value
1886 *      indicates whether the handler wishes the SCSI command to be
1887 *      completed successfully (0), or not (in which case cmd->result
1888 *      and sense buffer are assumed to be set).
1889 *
1890 *      LOCKING:
1891 *      spin_lock_irqsave(host lock)
1892 */
1893static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1894                unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1895{
1896        u8 *rbuf;
1897        unsigned int rc;
1898        struct scsi_cmnd *cmd = args->cmd;
1899        unsigned long flags;
1900
1901        rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1902        rc = actor(args, rbuf);
1903        ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1904
1905        if (rc == 0)
1906                cmd->result = SAM_STAT_GOOD;
1907        args->done(cmd);
1908}
1909
1910/**
1911 *      ata_scsiop_inq_std - Simulate INQUIRY command
1912 *      @args: device IDENTIFY data / SCSI command of interest.
1913 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1914 *
1915 *      Returns standard device identification data associated
1916 *      with non-VPD INQUIRY command output.
1917 *
1918 *      LOCKING:
1919 *      spin_lock_irqsave(host lock)
1920 */
1921static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1922{
1923        const u8 versions[] = {
1924                0x60,   /* SAM-3 (no version claimed) */
1925
1926                0x03,
1927                0x20,   /* SBC-2 (no version claimed) */
1928
1929                0x02,
1930                0x60    /* SPC-3 (no version claimed) */
1931        };
1932        u8 hdr[] = {
1933                TYPE_DISK,
1934                0,
1935                0x5,    /* claim SPC-3 version compatibility */
1936                2,
1937                95 - 4
1938        };
1939
1940        VPRINTK("ENTER\n");
1941
1942        /* set scsi removeable (RMB) bit per ata bit */
1943        if (ata_id_removeable(args->id))
1944                hdr[1] |= (1 << 7);
1945
1946        memcpy(rbuf, hdr, sizeof(hdr));
1947        memcpy(&rbuf[8], "ATA     ", 8);
1948        ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1949        ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1950
1951        if (rbuf[32] == 0 || rbuf[32] == ' ')
1952                memcpy(&rbuf[32], "n/a ", 4);
1953
1954        memcpy(rbuf + 59, versions, sizeof(versions));
1955
1956        return 0;
1957}
1958
1959/**
1960 *      ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1961 *      @args: device IDENTIFY data / SCSI command of interest.
1962 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1963 *
1964 *      Returns list of inquiry VPD pages available.
1965 *
1966 *      LOCKING:
1967 *      spin_lock_irqsave(host lock)
1968 */
1969static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1970{
1971        const u8 pages[] = {
1972                0x00,   /* page 0x00, this page */
1973                0x80,   /* page 0x80, unit serial no page */
1974                0x83,   /* page 0x83, device ident page */
1975                0x89,   /* page 0x89, ata info page */
1976                0xb1,   /* page 0xb1, block device characteristics page */
1977        };
1978
1979        rbuf[3] = sizeof(pages);        /* number of supported VPD pages */
1980        memcpy(rbuf + 4, pages, sizeof(pages));
1981        return 0;
1982}
1983
1984/**
1985 *      ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1986 *      @args: device IDENTIFY data / SCSI command of interest.
1987 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1988 *
1989 *      Returns ATA device serial number.
1990 *
1991 *      LOCKING:
1992 *      spin_lock_irqsave(host lock)
1993 */
1994static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1995{
1996        const u8 hdr[] = {
1997                0,
1998                0x80,                   /* this page code */
1999                0,
2000                ATA_ID_SERNO_LEN,       /* page len */
2001        };
2002
2003        memcpy(rbuf, hdr, sizeof(hdr));
2004        ata_id_string(args->id, (unsigned char *) &rbuf[4],
2005                      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2006        return 0;
2007}
2008
2009/**
2010 *      ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2011 *      @args: device IDENTIFY data / SCSI command of interest.
2012 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2013 *
2014 *      Yields two logical unit device identification designators:
2015 *       - vendor specific ASCII containing the ATA serial number
2016 *       - SAT defined "t10 vendor id based" containing ASCII vendor
2017 *         name ("ATA     "), model and serial numbers.
2018 *
2019 *      LOCKING:
2020 *      spin_lock_irqsave(host lock)
2021 */
2022static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2023{
2024        const int sat_model_serial_desc_len = 68;
2025        int num;
2026
2027        rbuf[1] = 0x83;                 /* this page code */
2028        num = 4;
2029
2030        /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2031        rbuf[num + 0] = 2;
2032        rbuf[num + 3] = ATA_ID_SERNO_LEN;
2033        num += 4;
2034        ata_id_string(args->id, (unsigned char *) rbuf + num,
2035                      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2036        num += ATA_ID_SERNO_LEN;
2037
2038        /* SAT defined lu model and serial numbers descriptor */
2039        /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2040        rbuf[num + 0] = 2;
2041        rbuf[num + 1] = 1;
2042        rbuf[num + 3] = sat_model_serial_desc_len;
2043        num += 4;
2044        memcpy(rbuf + num, "ATA     ", 8);
2045        num += 8;
2046        ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2047                      ATA_ID_PROD_LEN);
2048        num += ATA_ID_PROD_LEN;
2049        ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2050                      ATA_ID_SERNO_LEN);
2051        num += ATA_ID_SERNO_LEN;
2052
2053        rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
2054        return 0;
2055}
2056
2057/**
2058 *      ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2059 *      @args: device IDENTIFY data / SCSI command of interest.
2060 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2061 *
2062 *      Yields SAT-specified ATA VPD page.
2063 *
2064 *      LOCKING:
2065 *      spin_lock_irqsave(host lock)
2066 */
2067static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2068{
2069        struct ata_taskfile tf;
2070
2071        memset(&tf, 0, sizeof(tf));
2072
2073        rbuf[1] = 0x89;                 /* our page code */
2074        rbuf[2] = (0x238 >> 8);         /* page size fixed at 238h */
2075        rbuf[3] = (0x238 & 0xff);
2076
2077        memcpy(&rbuf[8], "linux   ", 8);
2078        memcpy(&rbuf[16], "libata          ", 16);
2079        memcpy(&rbuf[32], DRV_VERSION, 4);
2080        ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2081
2082        /* we don't store the ATA device signature, so we fake it */
2083
2084        tf.command = ATA_DRDY;          /* really, this is Status reg */
2085        tf.lbal = 0x1;
2086        tf.nsect = 0x1;
2087
2088        ata_tf_to_fis(&tf, 0, 1, &rbuf[36]);    /* TODO: PMP? */
2089        rbuf[36] = 0x34;                /* force D2H Reg FIS (34h) */
2090
2091        rbuf[56] = ATA_CMD_ID_ATA;
2092
2093        memcpy(&rbuf[60], &args->id[0], 512);
2094        return 0;
2095}
2096
2097static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2098{
2099        rbuf[1] = 0xb1;
2100        rbuf[3] = 0x3c;
2101        if (ata_id_major_version(args->id) > 7) {
2102                rbuf[4] = args->id[217] >> 8;
2103                rbuf[5] = args->id[217];
2104                rbuf[7] = args->id[168] & 0xf;
2105        }
2106
2107        return 0;
2108}
2109
2110/**
2111 *      ata_scsiop_noop - Command handler that simply returns success.
2112 *      @args: device IDENTIFY data / SCSI command of interest.
2113 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2114 *
2115 *      No operation.  Simply returns success to caller, to indicate
2116 *      that the caller should successfully complete this SCSI command.
2117 *
2118 *      LOCKING:
2119 *      spin_lock_irqsave(host lock)
2120 */
2121static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2122{
2123        VPRINTK("ENTER\n");
2124        return 0;
2125}
2126
2127/**
2128 *      ata_msense_caching - Simulate MODE SENSE caching info page
2129 *      @id: device IDENTIFY data
2130 *      @buf: output buffer
2131 *
2132 *      Generate a caching info page, which conditionally indicates
2133 *      write caching to the SCSI layer, depending on device
2134 *      capabilities.
2135 *
2136 *      LOCKING:
2137 *      None.
2138 */
2139static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2140{
2141        memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2142        if (ata_id_wcache_enabled(id))
2143                buf[2] |= (1 << 2);     /* write cache enable */
2144        if (!ata_id_rahead_enabled(id))
2145                buf[12] |= (1 << 5);    /* disable read ahead */
2146        return sizeof(def_cache_mpage);
2147}
2148
2149/**
2150 *      ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2151 *      @buf: output buffer
2152 *
2153 *      Generate a generic MODE SENSE control mode page.
2154 *
2155 *      LOCKING:
2156 *      None.
2157 */
2158static unsigned int ata_msense_ctl_mode(u8 *buf)
2159{
2160        memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2161        return sizeof(def_control_mpage);
2162}
2163
2164/**
2165 *      ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2166 *      @buf: output buffer
2167 *
2168 *      Generate a generic MODE SENSE r/w error recovery page.
2169 *
2170 *      LOCKING:
2171 *      None.
2172 */
2173static unsigned int ata_msense_rw_recovery(u8 *buf)
2174{
2175        memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2176        return sizeof(def_rw_recovery_mpage);
2177}
2178
2179/*
2180 * We can turn this into a real blacklist if it's needed, for now just
2181 * blacklist any Maxtor BANC1G10 revision firmware
2182 */
2183static int ata_dev_supports_fua(u16 *id)
2184{
2185        unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2186
2187        if (!libata_fua)
2188                return 0;
2189        if (!ata_id_has_fua(id))
2190                return 0;
2191
2192        ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2193        ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2194
2195        if (strcmp(model, "Maxtor"))
2196                return 1;
2197        if (strcmp(fw, "BANC1G10"))
2198                return 1;
2199
2200        return 0; /* blacklisted */
2201}
2202
2203/**
2204 *      ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2205 *      @args: device IDENTIFY data / SCSI command of interest.
2206 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2207 *
2208 *      Simulate MODE SENSE commands. Assume this is invoked for direct
2209 *      access devices (e.g. disks) only. There should be no block
2210 *      descriptor for other device types.
2211 *
2212 *      LOCKING:
2213 *      spin_lock_irqsave(host lock)
2214 */
2215static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2216{
2217        struct ata_device *dev = args->dev;
2218        u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2219        const u8 sat_blk_desc[] = {
2220                0, 0, 0, 0,     /* number of blocks: sat unspecified */
2221                0,
2222                0, 0x2, 0x0     /* block length: 512 bytes */
2223        };
2224        u8 pg, spg;
2225        unsigned int ebd, page_control, six_byte;
2226        u8 dpofua;
2227
2228        VPRINTK("ENTER\n");
2229
2230        six_byte = (scsicmd[0] == MODE_SENSE);
2231        ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
2232        /*
2233         * LLBA bit in msense(10) ignored (compliant)
2234         */
2235
2236        page_control = scsicmd[2] >> 6;
2237        switch (page_control) {
2238        case 0: /* current */
2239                break;  /* supported */
2240        case 3: /* saved */
2241                goto saving_not_supp;
2242        case 1: /* changeable */
2243        case 2: /* defaults */
2244        default:
2245                goto invalid_fld;
2246        }
2247
2248        if (six_byte)
2249                p += 4 + (ebd ? 8 : 0);
2250        else
2251                p += 8 + (ebd ? 8 : 0);
2252
2253        pg = scsicmd[2] & 0x3f;
2254        spg = scsicmd[3];
2255        /*
2256         * No mode subpages supported (yet) but asking for _all_
2257         * subpages may be valid
2258         */
2259        if (spg && (spg != ALL_SUB_MPAGES))
2260                goto invalid_fld;
2261
2262        switch(pg) {
2263        case RW_RECOVERY_MPAGE:
2264                p += ata_msense_rw_recovery(p);
2265                break;
2266
2267        case CACHE_MPAGE:
2268                p += ata_msense_caching(args->id, p);
2269                break;
2270
2271        case CONTROL_MPAGE:
2272                p += ata_msense_ctl_mode(p);
2273                break;
2274
2275        case ALL_MPAGES:
2276                p += ata_msense_rw_recovery(p);
2277                p += ata_msense_caching(args->id, p);
2278                p += ata_msense_ctl_mode(p);
2279                break;
2280
2281        default:                /* invalid page code */
2282                goto invalid_fld;
2283        }
2284
2285        dpofua = 0;
2286        if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2287            (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2288                dpofua = 1 << 4;
2289
2290        if (six_byte) {
2291                rbuf[0] = p - rbuf - 1;
2292                rbuf[2] |= dpofua;
2293                if (ebd) {
2294                        rbuf[3] = sizeof(sat_blk_desc);
2295                        memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2296                }
2297        } else {
2298                unsigned int output_len = p - rbuf - 2;
2299
2300                rbuf[0] = output_len >> 8;
2301                rbuf[1] = output_len;
2302                rbuf[3] |= dpofua;
2303                if (ebd) {
2304                        rbuf[7] = sizeof(sat_blk_desc);
2305                        memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2306                }
2307        }
2308        return 0;
2309
2310invalid_fld:
2311        ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2312        /* "Invalid field in cbd" */
2313        return 1;
2314
2315saving_not_supp:
2316        ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2317         /* "Saving parameters not supported" */
2318        return 1;
2319}
2320
2321/**
2322 *      ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2323 *      @args: device IDENTIFY data / SCSI command of interest.
2324 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2325 *
2326 *      Simulate READ CAPACITY commands.
2327 *
2328 *      LOCKING:
2329 *      None.
2330 */
2331static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2332{
2333        u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
2334
2335        VPRINTK("ENTER\n");
2336
2337        if (args->cmd->cmnd[0] == READ_CAPACITY) {
2338                if (last_lba >= 0xffffffffULL)
2339                        last_lba = 0xffffffff;
2340
2341                /* sector count, 32-bit */
2342                rbuf[0] = last_lba >> (8 * 3);
2343                rbuf[1] = last_lba >> (8 * 2);
2344                rbuf[2] = last_lba >> (8 * 1);
2345                rbuf[3] = last_lba;
2346
2347                /* sector size */
2348                rbuf[6] = ATA_SECT_SIZE >> 8;
2349                rbuf[7] = ATA_SECT_SIZE & 0xff;
2350        } else {
2351                /* sector count, 64-bit */
2352                rbuf[0] = last_lba >> (8 * 7);
2353                rbuf[1] = last_lba >> (8 * 6);
2354                rbuf[2] = last_lba >> (8 * 5);
2355                rbuf[3] = last_lba >> (8 * 4);
2356                rbuf[4] = last_lba >> (8 * 3);
2357                rbuf[5] = last_lba >> (8 * 2);
2358                rbuf[6] = last_lba >> (8 * 1);
2359                rbuf[7] = last_lba;
2360
2361                /* sector size */
2362                rbuf[10] = ATA_SECT_SIZE >> 8;
2363                rbuf[11] = ATA_SECT_SIZE & 0xff;
2364        }
2365
2366        return 0;
2367}
2368
2369/**
2370 *      ata_scsiop_report_luns - Simulate REPORT LUNS command
2371 *      @args: device IDENTIFY data / SCSI command of interest.
2372 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2373 *
2374 *      Simulate REPORT LUNS command.
2375 *
2376 *      LOCKING:
2377 *      spin_lock_irqsave(host lock)
2378 */
2379static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2380{
2381        VPRINTK("ENTER\n");
2382        rbuf[3] = 8;    /* just one lun, LUN 0, size 8 bytes */
2383
2384        return 0;
2385}
2386
2387static void atapi_sense_complete(struct ata_queued_cmd *qc)
2388{
2389        if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2390                /* FIXME: not quite right; we don't want the
2391                 * translation of taskfile registers into
2392                 * a sense descriptors, since that's only
2393                 * correct for ATA, not ATAPI
2394                 */
2395                ata_gen_passthru_sense(qc);
2396        }
2397
2398        qc->scsidone(qc->scsicmd);
2399        ata_qc_free(qc);
2400}
2401
2402/* is it pointless to prefer PIO for "safety reasons"? */
2403static inline int ata_pio_use_silly(struct ata_port *ap)
2404{
2405        return (ap->flags & ATA_FLAG_PIO_DMA);
2406}
2407
2408static void atapi_request_sense(struct ata_queued_cmd *qc)
2409{
2410        struct ata_port *ap = qc->ap;
2411        struct scsi_cmnd *cmd = qc->scsicmd;
2412
2413        DPRINTK("ATAPI request sense\n");
2414
2415        /* FIXME: is this needed? */
2416        memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2417
2418#ifdef CONFIG_ATA_SFF
2419        if (ap->ops->sff_tf_read)
2420                ap->ops->sff_tf_read(ap, &qc->tf);
2421#endif
2422
2423        /* fill these in, for the case where they are -not- overwritten */
2424        cmd->sense_buffer[0] = 0x70;
2425        cmd->sense_buffer[2] = qc->tf.feature >> 4;
2426
2427        ata_qc_reinit(qc);
2428
2429        /* setup sg table and init transfer direction */
2430        sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2431        ata_sg_init(qc, &qc->sgent, 1);
2432        qc->dma_dir = DMA_FROM_DEVICE;
2433
2434        memset(&qc->cdb, 0, qc->dev->cdb_len);
2435        qc->cdb[0] = REQUEST_SENSE;
2436        qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2437
2438        qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2439        qc->tf.command = ATA_CMD_PACKET;
2440
2441        if (ata_pio_use_silly(ap)) {
2442                qc->tf.protocol = ATAPI_PROT_DMA;
2443                qc->tf.feature |= ATAPI_PKT_DMA;
2444        } else {
2445                qc->tf.protocol = ATAPI_PROT_PIO;
2446                qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2447                qc->tf.lbah = 0;
2448        }
2449        qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2450
2451        qc->complete_fn = atapi_sense_complete;
2452
2453        ata_qc_issue(qc);
2454
2455        DPRINTK("EXIT\n");
2456}
2457
2458static void atapi_qc_complete(struct ata_queued_cmd *qc)
2459{
2460        struct scsi_cmnd *cmd = qc->scsicmd;
2461        unsigned int err_mask = qc->err_mask;
2462
2463        VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2464
2465        /* handle completion from new EH */
2466        if (unlikely(qc->ap->ops->error_handler &&
2467                     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2468
2469                if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2470                        /* FIXME: not quite right; we don't want the
2471                         * translation of taskfile registers into a
2472                         * sense descriptors, since that's only
2473                         * correct for ATA, not ATAPI
2474                         */
2475                        ata_gen_passthru_sense(qc);
2476                }
2477
2478                /* SCSI EH automatically locks door if sdev->locked is
2479                 * set.  Sometimes door lock request continues to
2480                 * fail, for example, when no media is present.  This
2481                 * creates a loop - SCSI EH issues door lock which
2482                 * fails and gets invoked again to acquire sense data
2483                 * for the failed command.
2484                 *
2485                 * If door lock fails, always clear sdev->locked to
2486                 * avoid this infinite loop.
2487                 */
2488                if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2489                        qc->dev->sdev->locked = 0;
2490
2491                qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2492                qc->scsidone(cmd);
2493                ata_qc_free(qc);
2494                return;
2495        }
2496
2497        /* successful completion or old EH failure path */
2498        if (unlikely(err_mask & AC_ERR_DEV)) {
2499                cmd->result = SAM_STAT_CHECK_CONDITION;
2500                atapi_request_sense(qc);
2501                return;
2502        } else if (unlikely(err_mask)) {
2503                /* FIXME: not quite right; we don't want the
2504                 * translation of taskfile registers into
2505                 * a sense descriptors, since that's only
2506                 * correct for ATA, not ATAPI
2507                 */
2508                ata_gen_passthru_sense(qc);
2509        } else {
2510                u8 *scsicmd = cmd->cmnd;
2511
2512                if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2513                        unsigned long flags;
2514                        u8 *buf;
2515
2516                        buf = ata_scsi_rbuf_get(cmd, true, &flags);
2517
2518        /* ATAPI devices typically report zero for their SCSI version,
2519         * and sometimes deviate from the spec WRT response data
2520         * format.  If SCSI version is reported as zero like normal,
2521         * then we make the following fixups:  1) Fake MMC-5 version,
2522         * to indicate to the Linux scsi midlayer this is a modern
2523         * device.  2) Ensure response data format / ATAPI information
2524         * are always correct.
2525         */
2526                        if (buf[2] == 0) {
2527                                buf[2] = 0x5;
2528                                buf[3] = 0x32;
2529                        }
2530
2531                        ata_scsi_rbuf_put(cmd, true, &flags);
2532                }
2533
2534                cmd->result = SAM_STAT_GOOD;
2535        }
2536
2537        qc->scsidone(cmd);
2538        ata_qc_free(qc);
2539}
2540/**
2541 *      atapi_xlat - Initialize PACKET taskfile
2542 *      @qc: command structure to be initialized
2543 *
2544 *      LOCKING:
2545 *      spin_lock_irqsave(host lock)
2546 *
2547 *      RETURNS:
2548 *      Zero on success, non-zero on failure.
2549 */
2550static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2551{
2552        struct scsi_cmnd *scmd = qc->scsicmd;
2553        struct ata_device *dev = qc->dev;
2554        int nodata = (scmd->sc_data_direction == DMA_NONE);
2555        int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2556        unsigned int nbytes;
2557
2558        memset(qc->cdb, 0, dev->cdb_len);
2559        memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2560
2561        qc->complete_fn = atapi_qc_complete;
2562
2563        qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2564        if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2565                qc->tf.flags |= ATA_TFLAG_WRITE;
2566                DPRINTK("direction: write\n");
2567        }
2568
2569        qc->tf.command = ATA_CMD_PACKET;
2570        ata_qc_set_pc_nbytes(qc);
2571
2572        /* check whether ATAPI DMA is safe */
2573        if (!nodata && !using_pio && atapi_check_dma(qc))
2574                using_pio = 1;
2575
2576        /* Some controller variants snoop this value for Packet
2577         * transfers to do state machine and FIFO management.  Thus we
2578         * want to set it properly, and for DMA where it is
2579         * effectively meaningless.
2580         */
2581        nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2582
2583        /* Most ATAPI devices which honor transfer chunk size don't
2584         * behave according to the spec when odd chunk size which
2585         * matches the transfer length is specified.  If the number of
2586         * bytes to transfer is 2n+1.  According to the spec, what
2587         * should happen is to indicate that 2n+1 is going to be
2588         * transferred and transfer 2n+2 bytes where the last byte is
2589         * padding.
2590         *
2591         * In practice, this doesn't happen.  ATAPI devices first
2592         * indicate and transfer 2n bytes and then indicate and
2593         * transfer 2 bytes where the last byte is padding.
2594         *
2595         * This inconsistency confuses several controllers which
2596         * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2597         * These controllers use actual number of transferred bytes to
2598         * update DMA poitner and transfer of 4n+2 bytes make those
2599         * controller push DMA pointer by 4n+4 bytes because SATA data
2600         * FISes are aligned to 4 bytes.  This causes data corruption
2601         * and buffer overrun.
2602         *
2603         * Always setting nbytes to even number solves this problem
2604         * because then ATAPI devices don't have to split data at 2n
2605         * boundaries.
2606         */
2607        if (nbytes & 0x1)
2608                nbytes++;
2609
2610        qc->tf.lbam = (nbytes & 0xFF);
2611        qc->tf.lbah = (nbytes >> 8);
2612
2613        if (nodata)
2614                qc->tf.protocol = ATAPI_PROT_NODATA;
2615        else if (using_pio)
2616                qc->tf.protocol = ATAPI_PROT_PIO;
2617        else {
2618                /* DMA data xfer */
2619                qc->tf.protocol = ATAPI_PROT_DMA;
2620                qc->tf.feature |= ATAPI_PKT_DMA;
2621
2622                if ((dev->flags & ATA_DFLAG_DMADIR) &&
2623                    (scmd->sc_data_direction != DMA_TO_DEVICE))
2624                        /* some SATA bridges need us to indicate data xfer direction */
2625                        qc->tf.feature |= ATAPI_DMADIR;
2626        }
2627
2628
2629        /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2630           as ATAPI tape drives don't get this right otherwise */
2631        return 0;
2632}
2633
2634static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2635{
2636        if (!sata_pmp_attached(ap)) {
2637                if (likely(devno < ata_link_max_devices(&ap->link)))
2638                        return &ap->link.device[devno];
2639        } else {
2640                if (likely(devno < ap->nr_pmp_links))
2641                        return &ap->pmp_link[devno].device[0];
2642        }
2643
2644        return NULL;
2645}
2646
2647static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2648                                              const struct scsi_device *scsidev)
2649{
2650        int devno;
2651
2652        /* skip commands not addressed to targets we simulate */
2653        if (!sata_pmp_attached(ap)) {
2654                if (unlikely(scsidev->channel || scsidev->lun))
2655                        return NULL;
2656                devno = scsidev->id;
2657        } else {
2658                if (unlikely(scsidev->id || scsidev->lun))
2659                        return NULL;
2660                devno = scsidev->channel;
2661        }
2662
2663        return ata_find_dev(ap, devno);
2664}
2665
2666/**
2667 *      ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2668 *      @ap: ATA port to which the device is attached
2669 *      @scsidev: SCSI device from which we derive the ATA device
2670 *
2671 *      Given various information provided in struct scsi_cmnd,
2672 *      map that onto an ATA bus, and using that mapping
2673 *      determine which ata_device is associated with the
2674 *      SCSI command to be sent.
2675 *
2676 *      LOCKING:
2677 *      spin_lock_irqsave(host lock)
2678 *
2679 *      RETURNS:
2680 *      Associated ATA device, or %NULL if not found.
2681 */
2682static struct ata_device *
2683ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2684{
2685        struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2686
2687        if (unlikely(!dev || !ata_dev_enabled(dev)))
2688                return NULL;
2689
2690        return dev;
2691}
2692
2693/*
2694 *      ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2695 *      @byte1: Byte 1 from pass-thru CDB.
2696 *
2697 *      RETURNS:
2698 *      ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2699 */
2700static u8
2701ata_scsi_map_proto(u8 byte1)
2702{
2703        switch((byte1 & 0x1e) >> 1) {
2704        case 3:         /* Non-data */
2705                return ATA_PROT_NODATA;
2706
2707        case 6:         /* DMA */
2708        case 10:        /* UDMA Data-in */
2709        case 11:        /* UDMA Data-Out */
2710                return ATA_PROT_DMA;
2711
2712        case 4:         /* PIO Data-in */
2713        case 5:         /* PIO Data-out */
2714                return ATA_PROT_PIO;
2715
2716        case 0:         /* Hard Reset */
2717        case 1:         /* SRST */
2718        case 8:         /* Device Diagnostic */
2719        case 9:         /* Device Reset */
2720        case 7:         /* DMA Queued */
2721        case 12:        /* FPDMA */
2722        case 15:        /* Return Response Info */
2723        default:        /* Reserved */
2724                break;
2725        }
2726
2727        return ATA_PROT_UNKNOWN;
2728}
2729
2730/**
2731 *      ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2732 *      @qc: command structure to be initialized
2733 *
2734 *      Handles either 12 or 16-byte versions of the CDB.
2735 *
2736 *      RETURNS:
2737 *      Zero on success, non-zero on failure.
2738 */
2739static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2740{
2741        struct ata_taskfile *tf = &(qc->tf);
2742        struct scsi_cmnd *scmd = qc->scsicmd;
2743        struct ata_device *dev = qc->dev;
2744        const u8 *cdb = scmd->cmnd;
2745
2746        if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2747                goto invalid_fld;
2748
2749        /*
2750         * Filter TPM commands by default. These provide an
2751         * essentially uncontrolled encrypted "back door" between
2752         * applications and the disk. Set libata.allow_tpm=1 if you
2753         * have a real reason for wanting to use them. This ensures
2754         * that installed software cannot easily mess stuff up without
2755         * user intent. DVR type users will probably ship with this enabled
2756         * for movie content management.
2757         *
2758         * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2759         * for this and should do in future but that it is not sufficient as
2760         * DCS is an optional feature set. Thus we also do the software filter
2761         * so that we comply with the TC consortium stated goal that the user
2762         * can turn off TC features of their system.
2763         */
2764        if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2765                goto invalid_fld;
2766
2767        /* We may not issue DMA commands if no DMA mode is set */
2768        if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2769                goto invalid_fld;
2770
2771        /*
2772         * 12 and 16 byte CDBs use different offsets to
2773         * provide the various register values.
2774         */
2775        if (cdb[0] == ATA_16) {
2776                /*
2777                 * 16-byte CDB - may contain extended commands.
2778                 *
2779                 * If that is the case, copy the upper byte register values.
2780                 */
2781                if (cdb[1] & 0x01) {
2782                        tf->hob_feature = cdb[3];
2783                        tf->hob_nsect = cdb[5];
2784                        tf->hob_lbal = cdb[7];
2785                        tf->hob_lbam = cdb[9];
2786                        tf->hob_lbah = cdb[11];
2787                        tf->flags |= ATA_TFLAG_LBA48;
2788                } else
2789                        tf->flags &= ~ATA_TFLAG_LBA48;
2790
2791                /*
2792                 * Always copy low byte, device and command registers.
2793                 */
2794                tf->feature = cdb[4];
2795                tf->nsect = cdb[6];
2796                tf->lbal = cdb[8];
2797                tf->lbam = cdb[10];
2798                tf->lbah = cdb[12];
2799                tf->device = cdb[13];
2800                tf->command = cdb[14];
2801        } else {
2802                /*
2803                 * 12-byte CDB - incapable of extended commands.
2804                 */
2805                tf->flags &= ~ATA_TFLAG_LBA48;
2806
2807                tf->feature = cdb[3];
2808                tf->nsect = cdb[4];
2809                tf->lbal = cdb[5];
2810                tf->lbam = cdb[6];
2811                tf->lbah = cdb[7];
2812                tf->device = cdb[8];
2813                tf->command = cdb[9];
2814        }
2815
2816        /* enforce correct master/slave bit */
2817        tf->device = dev->devno ?
2818                tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2819
2820        /* sanity check for pio multi commands */
2821        if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2822                goto invalid_fld;
2823
2824        if (is_multi_taskfile(tf)) {
2825                unsigned int multi_count = 1 << (cdb[1] >> 5);
2826
2827                /* compare the passed through multi_count
2828                 * with the cached multi_count of libata
2829                 */
2830                if (multi_count != dev->multi_count)
2831                        ata_dev_printk(dev, KERN_WARNING,
2832                                       "invalid multi_count %u ignored\n",
2833                                       multi_count);
2834        }
2835
2836        /* READ/WRITE LONG use a non-standard sect_size */
2837        qc->sect_size = ATA_SECT_SIZE;
2838        switch (tf->command) {
2839        case ATA_CMD_READ_LONG:
2840        case ATA_CMD_READ_LONG_ONCE:
2841        case ATA_CMD_WRITE_LONG:
2842        case ATA_CMD_WRITE_LONG_ONCE:
2843                if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2844                        goto invalid_fld;
2845                qc->sect_size = scsi_bufflen(scmd);
2846        }
2847
2848        /*
2849         * Filter SET_FEATURES - XFER MODE command -- otherwise,
2850         * SET_FEATURES - XFER MODE must be preceded/succeeded
2851         * by an update to hardware-specific registers for each
2852         * controller (i.e. the reason for ->set_piomode(),
2853         * ->set_dmamode(), and ->post_set_mode() hooks).
2854         */
2855        if ((tf->command == ATA_CMD_SET_FEATURES)
2856         && (tf->feature == SETFEATURES_XFER))
2857                goto invalid_fld;
2858
2859        /*
2860         * Set flags so that all registers will be written,
2861         * and pass on write indication (used for PIO/DMA
2862         * setup.)
2863         */
2864        tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2865
2866        if (scmd->sc_data_direction == DMA_TO_DEVICE)
2867                tf->flags |= ATA_TFLAG_WRITE;
2868
2869        /*
2870         * Set transfer length.
2871         *
2872         * TODO: find out if we need to do more here to
2873         *       cover scatter/gather case.
2874         */
2875        ata_qc_set_pc_nbytes(qc);
2876
2877        /* request result TF and be quiet about device error */
2878        qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2879
2880        return 0;
2881
2882 invalid_fld:
2883        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2884        /* "Invalid field in cdb" */
2885        return 1;
2886}
2887
2888/**
2889 *      ata_get_xlat_func - check if SCSI to ATA translation is possible
2890 *      @dev: ATA device
2891 *      @cmd: SCSI command opcode to consider
2892 *
2893 *      Look up the SCSI command given, and determine whether the
2894 *      SCSI command is to be translated or simulated.
2895 *
2896 *      RETURNS:
2897 *      Pointer to translation function if possible, %NULL if not.
2898 */
2899
2900static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2901{
2902        switch (cmd) {
2903        case READ_6:
2904        case READ_10:
2905        case READ_16:
2906
2907        case WRITE_6:
2908        case WRITE_10:
2909        case WRITE_16:
2910                return ata_scsi_rw_xlat;
2911
2912        case SYNCHRONIZE_CACHE:
2913                if (ata_try_flush_cache(dev))
2914                        return ata_scsi_flush_xlat;
2915                break;
2916
2917        case VERIFY:
2918        case VERIFY_16:
2919                return ata_scsi_verify_xlat;
2920
2921        case ATA_12:
2922        case ATA_16:
2923                return ata_scsi_pass_thru;
2924
2925        case START_STOP:
2926                return ata_scsi_start_stop_xlat;
2927        }
2928
2929        return NULL;
2930}
2931
2932/**
2933 *      ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2934 *      @ap: ATA port to which the command was being sent
2935 *      @cmd: SCSI command to dump
2936 *
2937 *      Prints the contents of a SCSI command via printk().
2938 */
2939
2940static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2941                                     struct scsi_cmnd *cmd)
2942{
2943#ifdef ATA_DEBUG
2944        struct scsi_device *scsidev = cmd->device;
2945        u8 *scsicmd = cmd->cmnd;
2946
2947        DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2948                ap->print_id,
2949                scsidev->channel, scsidev->id, scsidev->lun,
2950                scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2951                scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2952                scsicmd[8]);
2953#endif
2954}
2955
2956static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2957                                      void (*done)(struct scsi_cmnd *),
2958                                      struct ata_device *dev)
2959{
2960        u8 scsi_op = scmd->cmnd[0];
2961        ata_xlat_func_t xlat_func;
2962        int rc = 0;
2963
2964        if (dev->class == ATA_DEV_ATA) {
2965                if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2966                        goto bad_cdb_len;
2967
2968                xlat_func = ata_get_xlat_func(dev, scsi_op);
2969        } else {
2970                if (unlikely(!scmd->cmd_len))
2971                        goto bad_cdb_len;
2972
2973                xlat_func = NULL;
2974                if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2975                        /* relay SCSI command to ATAPI device */
2976                        int len = COMMAND_SIZE(scsi_op);
2977                        if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
2978                                goto bad_cdb_len;
2979
2980                        xlat_func = atapi_xlat;
2981                } else {
2982                        /* ATA_16 passthru, treat as an ATA command */
2983                        if (unlikely(scmd->cmd_len > 16))
2984                                goto bad_cdb_len;
2985
2986                        xlat_func = ata_get_xlat_func(dev, scsi_op);
2987                }
2988        }
2989
2990        if (xlat_func)
2991                rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2992        else
2993                ata_scsi_simulate(dev, scmd, done);
2994
2995        return rc;
2996
2997 bad_cdb_len:
2998        DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2999                scmd->cmd_len, scsi_op, dev->cdb_len);
3000        scmd->result = DID_ERROR << 16;
3001        done(scmd);
3002        return 0;
3003}
3004
3005/**
3006 *      ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3007 *      @cmd: SCSI command to be sent
3008 *      @done: Completion function, called when command is complete
3009 *
3010 *      In some cases, this function translates SCSI commands into
3011 *      ATA taskfiles, and queues the taskfiles to be sent to
3012 *      hardware.  In other cases, this function simulates a
3013 *      SCSI device by evaluating and responding to certain
3014 *      SCSI commands.  This creates the overall effect of
3015 *      ATA and ATAPI devices appearing as SCSI devices.
3016 *
3017 *      LOCKING:
3018 *      Releases scsi-layer-held lock, and obtains host lock.
3019 *
3020 *      RETURNS:
3021 *      Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3022 *      0 otherwise.
3023 */
3024int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3025{
3026        struct ata_port *ap;
3027        struct ata_device *dev;
3028        struct scsi_device *scsidev = cmd->device;
3029        struct Scsi_Host *shost = scsidev->host;
3030        int rc = 0;
3031
3032        ap = ata_shost_to_port(shost);
3033
3034        spin_unlock(shost->host_lock);
3035        spin_lock(ap->lock);
3036
3037        ata_scsi_dump_cdb(ap, cmd);
3038
3039        dev = ata_scsi_find_dev(ap, scsidev);
3040        if (likely(dev))
3041                rc = __ata_scsi_queuecmd(cmd, done, dev);
3042        else {
3043                cmd->result = (DID_BAD_TARGET << 16);
3044                done(cmd);
3045        }
3046
3047        spin_unlock(ap->lock);
3048        spin_lock(shost->host_lock);
3049        return rc;
3050}
3051
3052/**
3053 *      ata_scsi_simulate - simulate SCSI command on ATA device
3054 *      @dev: the target device
3055 *      @cmd: SCSI command being sent to device.
3056 *      @done: SCSI command completion function.
3057 *
3058 *      Interprets and directly executes a select list of SCSI commands
3059 *      that can be handled internally.
3060 *
3061 *      LOCKING:
3062 *      spin_lock_irqsave(host lock)
3063 */
3064
3065void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3066                      void (*done)(struct scsi_cmnd *))
3067{
3068        struct ata_scsi_args args;
3069        const u8 *scsicmd = cmd->cmnd;
3070        u8 tmp8;
3071
3072        args.dev = dev;
3073        args.id = dev->id;
3074        args.cmd = cmd;
3075        args.done = done;
3076
3077        switch(scsicmd[0]) {
3078        /* TODO: worth improving? */
3079        case FORMAT_UNIT:
3080                ata_scsi_invalid_field(cmd, done);
3081                break;
3082
3083        case INQUIRY:
3084                if (scsicmd[1] & 2)                /* is CmdDt set?  */
3085                        ata_scsi_invalid_field(cmd, done);
3086                else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
3087                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3088                else switch (scsicmd[2]) {
3089                case 0x00:
3090                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3091                        break;
3092                case 0x80:
3093                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3094                        break;
3095                case 0x83:
3096                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3097                        break;
3098                case 0x89:
3099                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3100                        break;
3101                case 0xb1:
3102                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3103                        break;
3104                default:
3105                        ata_scsi_invalid_field(cmd, done);
3106                        break;
3107                }
3108                break;
3109
3110        case MODE_SENSE:
3111        case MODE_SENSE_10:
3112                ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3113                break;
3114
3115        case MODE_SELECT:       /* unconditionally return */
3116        case MODE_SELECT_10:    /* bad-field-in-cdb */
3117                ata_scsi_invalid_field(cmd, done);
3118                break;
3119
3120        case READ_CAPACITY:
3121                ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3122                break;
3123
3124        case SERVICE_ACTION_IN:
3125                if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3126                        ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3127                else
3128                        ata_scsi_invalid_field(cmd, done);
3129                break;
3130
3131        case REPORT_LUNS:
3132                ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3133                break;
3134
3135        case REQUEST_SENSE:
3136                ata_scsi_set_sense(cmd, 0, 0, 0);
3137                cmd->result = (DRIVER_SENSE << 24);
3138                done(cmd);
3139                break;
3140
3141        /* if we reach this, then writeback caching is disabled,
3142         * turning this into a no-op.
3143         */
3144        case SYNCHRONIZE_CACHE:
3145                /* fall through */
3146
3147        /* no-op's, complete with success */
3148        case REZERO_UNIT:
3149        case SEEK_6:
3150        case SEEK_10:
3151        case TEST_UNIT_READY:
3152                ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3153                break;
3154
3155        case SEND_DIAGNOSTIC:
3156                tmp8 = scsicmd[1] & ~(1 << 3);
3157                if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3158                        ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3159                else
3160                        ata_scsi_invalid_field(cmd, done);
3161                break;
3162
3163        /* all other commands */
3164        default:
3165                ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3166                /* "Invalid command operation code" */
3167                done(cmd);
3168                break;
3169        }
3170}
3171
3172int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3173{
3174        int i, rc;
3175
3176        for (i = 0; i < host->n_ports; i++) {
3177                struct ata_port *ap = host->ports[i];
3178                struct Scsi_Host *shost;
3179
3180                rc = -ENOMEM;
3181                shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3182                if (!shost)
3183                        goto err_alloc;
3184
3185                *(struct ata_port **)&shost->hostdata[0] = ap;
3186                ap->scsi_host = shost;
3187
3188                shost->transportt = &ata_scsi_transport_template;
3189                shost->unique_id = ap->print_id;
3190                shost->max_id = 16;
3191                shost->max_lun = 1;
3192                shost->max_channel = 1;
3193                shost->max_cmd_len = 16;
3194
3195                /* Schedule policy is determined by ->qc_defer()
3196                 * callback and it needs to see every deferred qc.
3197                 * Set host_blocked to 1 to prevent SCSI midlayer from
3198                 * automatically deferring requests.
3199                 */
3200                shost->max_host_blocked = 1;
3201
3202                rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3203                if (rc)
3204                        goto err_add;
3205        }
3206
3207        return 0;
3208
3209 err_add:
3210        scsi_host_put(host->ports[i]->scsi_host);
3211 err_alloc:
3212        while (--i >= 0) {
3213                struct Scsi_Host *shost = host->ports[i]->scsi_host;
3214
3215                scsi_remove_host(shost);
3216                scsi_host_put(shost);
3217        }
3218        return rc;
3219}
3220
3221void ata_scsi_scan_host(struct ata_port *ap, int sync)
3222{
3223        int tries = 5;
3224        struct ata_device *last_failed_dev = NULL;
3225        struct ata_link *link;
3226        struct ata_device *dev;
3227
3228        if (ap->flags & ATA_FLAG_DISABLED)
3229                return;
3230
3231 repeat:
3232        ata_port_for_each_link(link, ap) {
3233                ata_link_for_each_dev(dev, link) {
3234                        struct scsi_device *sdev;
3235                        int channel = 0, id = 0;
3236
3237                        if (!ata_dev_enabled(dev) || dev->sdev)
3238                                continue;
3239
3240                        if (ata_is_host_link(link))
3241                                id = dev->devno;
3242                        else
3243                                channel = link->pmp;
3244
3245                        sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3246                                                 NULL);
3247                        if (!IS_ERR(sdev)) {
3248                                dev->sdev = sdev;
3249                                scsi_device_put(sdev);
3250                        }
3251                }
3252        }
3253
3254        /* If we scanned while EH was in progress or allocation
3255         * failure occurred, scan would have failed silently.  Check
3256         * whether all devices are attached.
3257         */
3258        ata_port_for_each_link(link, ap) {
3259                ata_link_for_each_dev(dev, link) {
3260                        if (ata_dev_enabled(dev) && !dev->sdev)
3261                                goto exit_loop;
3262                }
3263        }
3264 exit_loop:
3265        if (!link)
3266                return;
3267
3268        /* we're missing some SCSI devices */
3269        if (sync) {
3270                /* If caller requested synchrnous scan && we've made
3271                 * any progress, sleep briefly and repeat.
3272                 */
3273                if (dev != last_failed_dev) {
3274                        msleep(100);
3275                        last_failed_dev = dev;
3276                        goto repeat;
3277                }
3278
3279                /* We might be failing to detect boot device, give it
3280                 * a few more chances.
3281                 */
3282                if (--tries) {
3283                        msleep(100);
3284                        goto repeat;
3285                }
3286
3287                ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3288                                "failed without making any progress,\n"
3289                                "                  switching to async\n");
3290        }
3291
3292        queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3293                           round_jiffies_relative(HZ));
3294}
3295
3296/**
3297 *      ata_scsi_offline_dev - offline attached SCSI device
3298 *      @dev: ATA device to offline attached SCSI device for
3299 *
3300 *      This function is called from ata_eh_hotplug() and responsible
3301 *      for taking the SCSI device attached to @dev offline.  This
3302 *      function is called with host lock which protects dev->sdev
3303 *      against clearing.
3304 *
3305 *      LOCKING:
3306 *      spin_lock_irqsave(host lock)
3307 *
3308 *      RETURNS:
3309 *      1 if attached SCSI device exists, 0 otherwise.
3310 */
3311int ata_scsi_offline_dev(struct ata_device *dev)
3312{
3313        if (dev->sdev) {
3314                scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3315                return 1;
3316        }
3317        return 0;
3318}
3319
3320/**
3321 *      ata_scsi_remove_dev - remove attached SCSI device
3322 *      @dev: ATA device to remove attached SCSI device for
3323 *
3324 *      This function is called from ata_eh_scsi_hotplug() and
3325 *      responsible for removing the SCSI device attached to @dev.
3326 *
3327 *      LOCKING:
3328 *      Kernel thread context (may sleep).
3329 */
3330static void ata_scsi_remove_dev(struct ata_device *dev)
3331{
3332        struct ata_port *ap = dev->link->ap;
3333        struct scsi_device *sdev;
3334        unsigned long flags;
3335
3336        /* Alas, we need to grab scan_mutex to ensure SCSI device
3337         * state doesn't change underneath us and thus
3338         * scsi_device_get() always succeeds.  The mutex locking can
3339         * be removed if there is __scsi_device_get() interface which
3340         * increments reference counts regardless of device state.
3341         */
3342        mutex_lock(&ap->scsi_host->scan_mutex);
3343        spin_lock_irqsave(ap->lock, flags);
3344
3345        /* clearing dev->sdev is protected by host lock */
3346        sdev = dev->sdev;
3347        dev->sdev = NULL;
3348
3349        if (sdev) {
3350                /* If user initiated unplug races with us, sdev can go
3351                 * away underneath us after the host lock and
3352                 * scan_mutex are released.  Hold onto it.
3353                 */
3354                if (scsi_device_get(sdev) == 0) {
3355                        /* The following ensures the attached sdev is
3356                         * offline on return from ata_scsi_offline_dev()
3357                         * regardless it wins or loses the race
3358                         * against this function.
3359                         */
3360                        scsi_device_set_state(sdev, SDEV_OFFLINE);
3361                } else {
3362                        WARN_ON(1);
3363                        sdev = NULL;
3364                }
3365        }
3366
3367        spin_unlock_irqrestore(ap->lock, flags);
3368        mutex_unlock(&ap->scsi_host->scan_mutex);
3369
3370        if (sdev) {
3371                ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3372                               sdev->sdev_gendev.bus_id);
3373
3374                scsi_remove_device(sdev);
3375                scsi_device_put(sdev);
3376        }
3377}
3378
3379static void ata_scsi_handle_link_detach(struct ata_link *link)
3380{
3381        struct ata_port *ap = link->ap;
3382        struct ata_device *dev;
3383
3384        ata_link_for_each_dev(dev, link) {
3385                unsigned long flags;
3386
3387                if (!(dev->flags & ATA_DFLAG_DETACHED))
3388                        continue;
3389
3390                spin_lock_irqsave(ap->lock, flags);
3391                dev->flags &= ~ATA_DFLAG_DETACHED;
3392                spin_unlock_irqrestore(ap->lock, flags);
3393
3394                ata_scsi_remove_dev(dev);
3395        }
3396}
3397
3398/**
3399 *      ata_scsi_media_change_notify - send media change event
3400 *      @dev: Pointer to the disk device with media change event
3401 *
3402 *      Tell the block layer to send a media change notification
3403 *      event.
3404 *
3405 *      LOCKING:
3406 *      spin_lock_irqsave(host lock)
3407 */
3408void ata_scsi_media_change_notify(struct ata_device *dev)
3409{
3410        if (dev->sdev)
3411                sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3412                                     GFP_ATOMIC);
3413}
3414
3415/**
3416 *      ata_scsi_hotplug - SCSI part of hotplug
3417 *      @work: Pointer to ATA port to perform SCSI hotplug on
3418 *
3419 *      Perform SCSI part of hotplug.  It's executed from a separate
3420 *      workqueue after EH completes.  This is necessary because SCSI
3421 *      hot plugging requires working EH and hot unplugging is
3422 *      synchronized with hot plugging with a mutex.
3423 *
3424 *      LOCKING:
3425 *      Kernel thread context (may sleep).
3426 */
3427void ata_scsi_hotplug(struct work_struct *work)
3428{
3429        struct ata_port *ap =
3430                container_of(work, struct ata_port, hotplug_task.work);
3431        int i;
3432
3433        if (ap->pflags & ATA_PFLAG_UNLOADING) {
3434                DPRINTK("ENTER/EXIT - unloading\n");
3435                return;
3436        }
3437
3438        DPRINTK("ENTER\n");
3439
3440        /* Unplug detached devices.  We cannot use link iterator here
3441         * because PMP links have to be scanned even if PMP is
3442         * currently not attached.  Iterate manually.
3443         */
3444        ata_scsi_handle_link_detach(&ap->link);
3445        if (ap->pmp_link)
3446                for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3447                        ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3448
3449        /* scan for new ones */
3450        ata_scsi_scan_host(ap, 0);
3451
3452        DPRINTK("EXIT\n");
3453}
3454
3455/**
3456 *      ata_scsi_user_scan - indication for user-initiated bus scan
3457 *      @shost: SCSI host to scan
3458 *      @channel: Channel to scan
3459 *      @id: ID to scan
3460 *      @lun: LUN to scan
3461 *
3462 *      This function is called when user explicitly requests bus
3463 *      scan.  Set probe pending flag and invoke EH.
3464 *
3465 *      LOCKING:
3466 *      SCSI layer (we don't care)
3467 *
3468 *      RETURNS:
3469 *      Zero.
3470 */
3471static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3472                              unsigned int id, unsigned int lun)
3473{
3474        struct ata_port *ap = ata_shost_to_port(shost);
3475        unsigned long flags;
3476        int devno, rc = 0;
3477
3478        if (!ap->ops->error_handler)
3479                return -EOPNOTSUPP;
3480
3481        if (lun != SCAN_WILD_CARD && lun)
3482                return -EINVAL;
3483
3484        if (!sata_pmp_attached(ap)) {
3485                if (channel != SCAN_WILD_CARD && channel)
3486                        return -EINVAL;
3487                devno = id;
3488        } else {
3489                if (id != SCAN_WILD_CARD && id)
3490                        return -EINVAL;
3491                devno = channel;
3492        }
3493
3494        spin_lock_irqsave(ap->lock, flags);
3495
3496        if (devno == SCAN_WILD_CARD) {
3497                struct ata_link *link;
3498
3499                ata_port_for_each_link(link, ap) {
3500                        struct ata_eh_info *ehi = &link->eh_info;
3501                        ehi->probe_mask |= ATA_ALL_DEVICES;
3502                        ehi->action |= ATA_EH_RESET;
3503                }
3504        } else {
3505                struct ata_device *dev = ata_find_dev(ap, devno);
3506
3507                if (dev) {
3508                        struct ata_eh_info *ehi = &dev->link->eh_info;
3509                        ehi->probe_mask |= 1 << dev->devno;
3510                        ehi->action |= ATA_EH_RESET;
3511                } else
3512                        rc = -EINVAL;
3513        }
3514
3515        if (rc == 0) {
3516                ata_port_schedule_eh(ap);
3517                spin_unlock_irqrestore(ap->lock, flags);
3518                ata_port_wait_eh(ap);
3519        } else
3520                spin_unlock_irqrestore(ap->lock, flags);
3521
3522        return rc;
3523}
3524
3525/**
3526 *      ata_scsi_dev_rescan - initiate scsi_rescan_device()
3527 *      @work: Pointer to ATA port to perform scsi_rescan_device()
3528 *
3529 *      After ATA pass thru (SAT) commands are executed successfully,
3530 *      libata need to propagate the changes to SCSI layer.  This
3531 *      function must be executed from ata_aux_wq such that sdev
3532 *      attach/detach don't race with rescan.
3533 *
3534 *      LOCKING:
3535 *      Kernel thread context (may sleep).
3536 */
3537void ata_scsi_dev_rescan(struct work_struct *work)
3538{
3539        struct ata_port *ap =
3540                container_of(work, struct ata_port, scsi_rescan_task);
3541        struct ata_link *link;
3542        struct ata_device *dev;
3543        unsigned long flags;
3544
3545        spin_lock_irqsave(ap->lock, flags);
3546
3547        ata_port_for_each_link(link, ap) {
3548                ata_link_for_each_dev(dev, link) {
3549                        struct scsi_device *sdev = dev->sdev;
3550
3551                        if (!ata_dev_enabled(dev) || !sdev)
3552                                continue;
3553                        if (scsi_device_get(sdev))
3554                                continue;
3555
3556                        spin_unlock_irqrestore(ap->lock, flags);
3557                        scsi_rescan_device(&(sdev->sdev_gendev));
3558                        scsi_device_put(sdev);
3559                        spin_lock_irqsave(ap->lock, flags);
3560                }
3561        }
3562
3563        spin_unlock_irqrestore(ap->lock, flags);
3564}
3565
3566/**
3567 *      ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3568 *      @host: ATA host container for all SAS ports
3569 *      @port_info: Information from low-level host driver
3570 *      @shost: SCSI host that the scsi device is attached to
3571 *
3572 *      LOCKING:
3573 *      PCI/etc. bus probe sem.
3574 *
3575 *      RETURNS:
3576 *      ata_port pointer on success / NULL on failure.
3577 */
3578
3579struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3580                                    struct ata_port_info *port_info,
3581                                    struct Scsi_Host *shost)
3582{
3583        struct ata_port *ap;
3584
3585        ap = ata_port_alloc(host);
3586        if (!ap)
3587                return NULL;
3588
3589        ap->port_no = 0;
3590        ap->lock = shost->host_lock;
3591        ap->pio_mask = port_info->pio_mask;
3592        ap->mwdma_mask = port_info->mwdma_mask;
3593        ap->udma_mask = port_info->udma_mask;
3594        ap->flags |= port_info->flags;
3595        ap->ops = port_info->port_ops;
3596        ap->cbl = ATA_CBL_SATA;
3597
3598        return ap;
3599}
3600EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3601
3602/**
3603 *      ata_sas_port_start - Set port up for dma.
3604 *      @ap: Port to initialize
3605 *
3606 *      Called just after data structures for each port are
3607 *      initialized.
3608 *
3609 *      May be used as the port_start() entry in ata_port_operations.
3610 *
3611 *      LOCKING:
3612 *      Inherited from caller.
3613 */
3614int ata_sas_port_start(struct ata_port *ap)
3615{
3616        return 0;
3617}
3618EXPORT_SYMBOL_GPL(ata_sas_port_start);
3619
3620/**
3621 *      ata_port_stop - Undo ata_sas_port_start()
3622 *      @ap: Port to shut down
3623 *
3624 *      May be used as the port_stop() entry in ata_port_operations.
3625 *
3626 *      LOCKING:
3627 *      Inherited from caller.
3628 */
3629
3630void ata_sas_port_stop(struct ata_port *ap)
3631{
3632}
3633EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3634
3635/**
3636 *      ata_sas_port_init - Initialize a SATA device
3637 *      @ap: SATA port to initialize
3638 *
3639 *      LOCKING:
3640 *      PCI/etc. bus probe sem.
3641 *
3642 *      RETURNS:
3643 *      Zero on success, non-zero on error.
3644 */
3645
3646int ata_sas_port_init(struct ata_port *ap)
3647{
3648        int rc = ap->ops->port_start(ap);
3649
3650        if (!rc) {
3651                ap->print_id = ata_print_id++;
3652                rc = ata_bus_probe(ap);
3653        }
3654
3655        return rc;
3656}
3657EXPORT_SYMBOL_GPL(ata_sas_port_init);
3658
3659/**
3660 *      ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3661 *      @ap: SATA port to destroy
3662 *
3663 */
3664
3665void ata_sas_port_destroy(struct ata_port *ap)
3666{
3667        if (ap->ops->port_stop)
3668                ap->ops->port_stop(ap);
3669        kfree(ap);
3670}
3671EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3672
3673/**
3674 *      ata_sas_slave_configure - Default slave_config routine for libata devices
3675 *      @sdev: SCSI device to configure
3676 *      @ap: ATA port to which SCSI device is attached
3677 *
3678 *      RETURNS:
3679 *      Zero.
3680 */
3681
3682int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3683{
3684        ata_scsi_sdev_config(sdev);
3685        ata_scsi_dev_config(sdev, ap->link.device);
3686        return 0;
3687}
3688EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3689
3690/**
3691 *      ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3692 *      @cmd: SCSI command to be sent
3693 *      @done: Completion function, called when command is complete
3694 *      @ap:    ATA port to which the command is being sent
3695 *
3696 *      RETURNS:
3697 *      Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3698 *      0 otherwise.
3699 */
3700
3701int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3702                     struct ata_port *ap)
3703{
3704        int rc = 0;
3705
3706        ata_scsi_dump_cdb(ap, cmd);
3707
3708        if (likely(ata_dev_enabled(ap->link.device)))
3709                rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3710        else {
3711                cmd->result = (DID_BAD_TARGET << 16);
3712                done(cmd);
3713        }
3714        return rc;
3715}
3716EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
3717