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/slab.h>
  37#include <linux/kernel.h>
  38#include <linux/blkdev.h>
  39#include <linux/spinlock.h>
  40#include <linux/export.h>
  41#include <scsi/scsi.h>
  42#include <scsi/scsi_host.h>
  43#include <scsi/scsi_cmnd.h>
  44#include <scsi/scsi_eh.h>
  45#include <scsi/scsi_device.h>
  46#include <scsi/scsi_tcq.h>
  47#include <scsi/scsi_transport.h>
  48#include <linux/libata.h>
  49#include <linux/hdreg.h>
  50#include <linux/uaccess.h>
  51#include <linux/suspend.h>
  52#include <asm/unaligned.h>
  53
  54#include "libata.h"
  55#include "libata-transport.h"
  56
  57#define ATA_SCSI_RBUF_SIZE      4096
  58
  59static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
  60static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
  61
  62typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
  63
  64static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
  65                                        const struct scsi_device *scsidev);
  66static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
  67                                            const struct scsi_device *scsidev);
  68
  69#define RW_RECOVERY_MPAGE 0x1
  70#define RW_RECOVERY_MPAGE_LEN 12
  71#define CACHE_MPAGE 0x8
  72#define CACHE_MPAGE_LEN 20
  73#define CONTROL_MPAGE 0xa
  74#define CONTROL_MPAGE_LEN 12
  75#define ALL_MPAGES 0x3f
  76#define ALL_SUB_MPAGES 0xff
  77
  78
  79static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
  80        RW_RECOVERY_MPAGE,
  81        RW_RECOVERY_MPAGE_LEN - 2,
  82        (1 << 7),       /* AWRE */
  83        0,              /* read retry count */
  84        0, 0, 0, 0,
  85        0,              /* write retry count */
  86        0, 0, 0
  87};
  88
  89static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
  90        CACHE_MPAGE,
  91        CACHE_MPAGE_LEN - 2,
  92        0,              /* contains WCE, needs to be 0 for logic */
  93        0, 0, 0, 0, 0, 0, 0, 0, 0,
  94        0,              /* contains DRA, needs to be 0 for logic */
  95        0, 0, 0, 0, 0, 0, 0
  96};
  97
  98static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
  99        CONTROL_MPAGE,
 100        CONTROL_MPAGE_LEN - 2,
 101        2,      /* DSENSE=0, GLTSD=1 */
 102        0,      /* [QAM+QERR may be 1, see 05-359r1] */
 103        0, 0, 0, 0, 0xff, 0xff,
 104        0, 30   /* extended self test time, see 05-359r1 */
 105};
 106
 107static const char *ata_lpm_policy_names[] = {
 108        [ATA_LPM_UNKNOWN]       = "max_performance",
 109        [ATA_LPM_MAX_POWER]     = "max_performance",
 110        [ATA_LPM_MED_POWER]     = "medium_power",
 111        [ATA_LPM_MIN_POWER]     = "min_power",
 112};
 113
 114static ssize_t ata_scsi_lpm_store(struct device *dev,
 115                                  struct device_attribute *attr,
 116                                  const char *buf, size_t count)
 117{
 118        struct Scsi_Host *shost = class_to_shost(dev);
 119        struct ata_port *ap = ata_shost_to_port(shost);
 120        enum ata_lpm_policy policy;
 121        unsigned long flags;
 122
 123        /* UNKNOWN is internal state, iterate from MAX_POWER */
 124        for (policy = ATA_LPM_MAX_POWER;
 125             policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
 126                const char *name = ata_lpm_policy_names[policy];
 127
 128                if (strncmp(name, buf, strlen(name)) == 0)
 129                        break;
 130        }
 131        if (policy == ARRAY_SIZE(ata_lpm_policy_names))
 132                return -EINVAL;
 133
 134        spin_lock_irqsave(ap->lock, flags);
 135        ap->target_lpm_policy = policy;
 136        ata_port_schedule_eh(ap);
 137        spin_unlock_irqrestore(ap->lock, flags);
 138
 139        return count;
 140}
 141
 142static ssize_t ata_scsi_lpm_show(struct device *dev,
 143                                 struct device_attribute *attr, char *buf)
 144{
 145        struct Scsi_Host *shost = class_to_shost(dev);
 146        struct ata_port *ap = ata_shost_to_port(shost);
 147
 148        if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
 149                return -EINVAL;
 150
 151        return snprintf(buf, PAGE_SIZE, "%s\n",
 152                        ata_lpm_policy_names[ap->target_lpm_policy]);
 153}
 154DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
 155            ata_scsi_lpm_show, ata_scsi_lpm_store);
 156EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
 157
 158static ssize_t ata_scsi_park_show(struct device *device,
 159                                  struct device_attribute *attr, char *buf)
 160{
 161        struct scsi_device *sdev = to_scsi_device(device);
 162        struct ata_port *ap;
 163        struct ata_link *link;
 164        struct ata_device *dev;
 165        unsigned long flags, now;
 166        unsigned int uninitialized_var(msecs);
 167        int rc = 0;
 168
 169        ap = ata_shost_to_port(sdev->host);
 170
 171        spin_lock_irqsave(ap->lock, flags);
 172        dev = ata_scsi_find_dev(ap, sdev);
 173        if (!dev) {
 174                rc = -ENODEV;
 175                goto unlock;
 176        }
 177        if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
 178                rc = -EOPNOTSUPP;
 179                goto unlock;
 180        }
 181
 182        link = dev->link;
 183        now = jiffies;
 184        if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
 185            link->eh_context.unloaded_mask & (1 << dev->devno) &&
 186            time_after(dev->unpark_deadline, now))
 187                msecs = jiffies_to_msecs(dev->unpark_deadline - now);
 188        else
 189                msecs = 0;
 190
 191unlock:
 192        spin_unlock_irq(ap->lock);
 193
 194        return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
 195}
 196
 197static ssize_t ata_scsi_park_store(struct device *device,
 198                                   struct device_attribute *attr,
 199                                   const char *buf, size_t len)
 200{
 201        struct scsi_device *sdev = to_scsi_device(device);
 202        struct ata_port *ap;
 203        struct ata_device *dev;
 204        long int input;
 205        unsigned long flags;
 206        int rc;
 207
 208        rc = strict_strtol(buf, 10, &input);
 209        if (rc || input < -2)
 210                return -EINVAL;
 211        if (input > ATA_TMOUT_MAX_PARK) {
 212                rc = -EOVERFLOW;
 213                input = ATA_TMOUT_MAX_PARK;
 214        }
 215
 216        ap = ata_shost_to_port(sdev->host);
 217
 218        spin_lock_irqsave(ap->lock, flags);
 219        dev = ata_scsi_find_dev(ap, sdev);
 220        if (unlikely(!dev)) {
 221                rc = -ENODEV;
 222                goto unlock;
 223        }
 224        if (dev->class != ATA_DEV_ATA) {
 225                rc = -EOPNOTSUPP;
 226                goto unlock;
 227        }
 228
 229        if (input >= 0) {
 230                if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
 231                        rc = -EOPNOTSUPP;
 232                        goto unlock;
 233                }
 234
 235                dev->unpark_deadline = ata_deadline(jiffies, input);
 236                dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
 237                ata_port_schedule_eh(ap);
 238                complete(&ap->park_req_pending);
 239        } else {
 240                switch (input) {
 241                case -1:
 242                        dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
 243                        break;
 244                case -2:
 245                        dev->flags |= ATA_DFLAG_NO_UNLOAD;
 246                        break;
 247                }
 248        }
 249unlock:
 250        spin_unlock_irqrestore(ap->lock, flags);
 251
 252        return rc ? rc : len;
 253}
 254DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
 255            ata_scsi_park_show, ata_scsi_park_store);
 256EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
 257
 258static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
 259{
 260        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 261
 262        scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
 263}
 264
 265static ssize_t
 266ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
 267                          const char *buf, size_t count)
 268{
 269        struct Scsi_Host *shost = class_to_shost(dev);
 270        struct ata_port *ap = ata_shost_to_port(shost);
 271        if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
 272                return ap->ops->em_store(ap, buf, count);
 273        return -EINVAL;
 274}
 275
 276static ssize_t
 277ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
 278                         char *buf)
 279{
 280        struct Scsi_Host *shost = class_to_shost(dev);
 281        struct ata_port *ap = ata_shost_to_port(shost);
 282
 283        if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
 284                return ap->ops->em_show(ap, buf);
 285        return -EINVAL;
 286}
 287DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
 288                ata_scsi_em_message_show, ata_scsi_em_message_store);
 289EXPORT_SYMBOL_GPL(dev_attr_em_message);
 290
 291static ssize_t
 292ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
 293                              char *buf)
 294{
 295        struct Scsi_Host *shost = class_to_shost(dev);
 296        struct ata_port *ap = ata_shost_to_port(shost);
 297
 298        return snprintf(buf, 23, "%d\n", ap->em_message_type);
 299}
 300DEVICE_ATTR(em_message_type, S_IRUGO,
 301                  ata_scsi_em_message_type_show, NULL);
 302EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
 303
 304static ssize_t
 305ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
 306                char *buf)
 307{
 308        struct scsi_device *sdev = to_scsi_device(dev);
 309        struct ata_port *ap = ata_shost_to_port(sdev->host);
 310        struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
 311
 312        if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
 313                return ap->ops->sw_activity_show(atadev, buf);
 314        return -EINVAL;
 315}
 316
 317static ssize_t
 318ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
 319        const char *buf, size_t count)
 320{
 321        struct scsi_device *sdev = to_scsi_device(dev);
 322        struct ata_port *ap = ata_shost_to_port(sdev->host);
 323        struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
 324        enum sw_activity val;
 325        int rc;
 326
 327        if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
 328                val = simple_strtoul(buf, NULL, 0);
 329                switch (val) {
 330                case OFF: case BLINK_ON: case BLINK_OFF:
 331                        rc = ap->ops->sw_activity_store(atadev, val);
 332                        if (!rc)
 333                                return count;
 334                        else
 335                                return rc;
 336                }
 337        }
 338        return -EINVAL;
 339}
 340DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
 341                        ata_scsi_activity_store);
 342EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
 343
 344struct device_attribute *ata_common_sdev_attrs[] = {
 345        &dev_attr_unload_heads,
 346        NULL
 347};
 348EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
 349
 350static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
 351{
 352        ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
 353        /* "Invalid field in cbd" */
 354        cmd->scsi_done(cmd);
 355}
 356
 357/**
 358 *      ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
 359 *      @sdev: SCSI device for which BIOS geometry is to be determined
 360 *      @bdev: block device associated with @sdev
 361 *      @capacity: capacity of SCSI device
 362 *      @geom: location to which geometry will be output
 363 *
 364 *      Generic bios head/sector/cylinder calculator
 365 *      used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
 366 *      mapping. Some situations may arise where the disk is not
 367 *      bootable if this is not used.
 368 *
 369 *      LOCKING:
 370 *      Defined by the SCSI layer.  We don't really care.
 371 *
 372 *      RETURNS:
 373 *      Zero.
 374 */
 375int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
 376                       sector_t capacity, int geom[])
 377{
 378        geom[0] = 255;
 379        geom[1] = 63;
 380        sector_div(capacity, 255*63);
 381        geom[2] = capacity;
 382
 383        return 0;
 384}
 385
 386/**
 387 *      ata_scsi_unlock_native_capacity - unlock native capacity
 388 *      @sdev: SCSI device to adjust device capacity for
 389 *
 390 *      This function is called if a partition on @sdev extends beyond
 391 *      the end of the device.  It requests EH to unlock HPA.
 392 *
 393 *      LOCKING:
 394 *      Defined by the SCSI layer.  Might sleep.
 395 */
 396void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
 397{
 398        struct ata_port *ap = ata_shost_to_port(sdev->host);
 399        struct ata_device *dev;
 400        unsigned long flags;
 401
 402        spin_lock_irqsave(ap->lock, flags);
 403
 404        dev = ata_scsi_find_dev(ap, sdev);
 405        if (dev && dev->n_sectors < dev->n_native_sectors) {
 406                dev->flags |= ATA_DFLAG_UNLOCK_HPA;
 407                dev->link->eh_info.action |= ATA_EH_RESET;
 408                ata_port_schedule_eh(ap);
 409        }
 410
 411        spin_unlock_irqrestore(ap->lock, flags);
 412        ata_port_wait_eh(ap);
 413}
 414
 415/**
 416 *      ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
 417 *      @ap: target port
 418 *      @sdev: SCSI device to get identify data for
 419 *      @arg: User buffer area for identify data
 420 *
 421 *      LOCKING:
 422 *      Defined by the SCSI layer.  We don't really care.
 423 *
 424 *      RETURNS:
 425 *      Zero on success, negative errno on error.
 426 */
 427static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
 428                            void __user *arg)
 429{
 430        struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
 431        u16 __user *dst = arg;
 432        char buf[40];
 433
 434        if (!dev)
 435                return -ENOMSG;
 436
 437        if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
 438                return -EFAULT;
 439
 440        ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
 441        if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
 442                return -EFAULT;
 443
 444        ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
 445        if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
 446                return -EFAULT;
 447
 448        ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
 449        if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
 450                return -EFAULT;
 451
 452        return 0;
 453}
 454
 455/**
 456 *      ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
 457 *      @scsidev: Device to which we are issuing command
 458 *      @arg: User provided data for issuing command
 459 *
 460 *      LOCKING:
 461 *      Defined by the SCSI layer.  We don't really care.
 462 *
 463 *      RETURNS:
 464 *      Zero on success, negative errno on error.
 465 */
 466int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
 467{
 468        int rc = 0;
 469        u8 scsi_cmd[MAX_COMMAND_SIZE];
 470        u8 args[4], *argbuf = NULL, *sensebuf = NULL;
 471        int argsize = 0;
 472        enum dma_data_direction data_dir;
 473        int cmd_result;
 474
 475        if (arg == NULL)
 476                return -EINVAL;
 477
 478        if (copy_from_user(args, arg, sizeof(args)))
 479                return -EFAULT;
 480
 481        sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
 482        if (!sensebuf)
 483                return -ENOMEM;
 484
 485        memset(scsi_cmd, 0, sizeof(scsi_cmd));
 486
 487        if (args[3]) {
 488                argsize = ATA_SECT_SIZE * args[3];
 489                argbuf = kmalloc(argsize, GFP_KERNEL);
 490                if (argbuf == NULL) {
 491                        rc = -ENOMEM;
 492                        goto error;
 493                }
 494
 495                scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
 496                scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
 497                                            block count in sector count field */
 498                data_dir = DMA_FROM_DEVICE;
 499        } else {
 500                scsi_cmd[1]  = (3 << 1); /* Non-data */
 501                scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
 502                data_dir = DMA_NONE;
 503        }
 504
 505        scsi_cmd[0] = ATA_16;
 506
 507        scsi_cmd[4] = args[2];
 508        if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
 509                scsi_cmd[6]  = args[3];
 510                scsi_cmd[8]  = args[1];
 511                scsi_cmd[10] = 0x4f;
 512                scsi_cmd[12] = 0xc2;
 513        } else {
 514                scsi_cmd[6]  = args[1];
 515        }
 516        scsi_cmd[14] = args[0];
 517
 518        /* Good values for timeout and retries?  Values below
 519           from scsi_ioctl_send_command() for default case... */
 520        cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
 521                                  sensebuf, (10*HZ), 5, 0, NULL);
 522
 523        if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
 524                u8 *desc = sensebuf + 8;
 525                cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 526
 527                /* If we set cc then ATA pass-through will cause a
 528                 * check condition even if no error. Filter that. */
 529                if (cmd_result & SAM_STAT_CHECK_CONDITION) {
 530                        struct scsi_sense_hdr sshdr;
 531                        scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
 532                                             &sshdr);
 533                        if (sshdr.sense_key == 0 &&
 534                            sshdr.asc == 0 && sshdr.ascq == 0)
 535                                cmd_result &= ~SAM_STAT_CHECK_CONDITION;
 536                }
 537
 538                /* Send userspace a few ATA registers (same as drivers/ide) */
 539                if (sensebuf[0] == 0x72 &&      /* format is "descriptor" */
 540                    desc[0] == 0x09) {          /* code is "ATA Descriptor" */
 541                        args[0] = desc[13];     /* status */
 542                        args[1] = desc[3];      /* error */
 543                        args[2] = desc[5];      /* sector count (0:7) */
 544                        if (copy_to_user(arg, args, sizeof(args)))
 545                                rc = -EFAULT;
 546                }
 547        }
 548
 549
 550        if (cmd_result) {
 551                rc = -EIO;
 552                goto error;
 553        }
 554
 555        if ((argbuf)
 556         && copy_to_user(arg + sizeof(args), argbuf, argsize))
 557                rc = -EFAULT;
 558error:
 559        kfree(sensebuf);
 560        kfree(argbuf);
 561        return rc;
 562}
 563
 564/**
 565 *      ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
 566 *      @scsidev: Device to which we are issuing command
 567 *      @arg: User provided data for issuing command
 568 *
 569 *      LOCKING:
 570 *      Defined by the SCSI layer.  We don't really care.
 571 *
 572 *      RETURNS:
 573 *      Zero on success, negative errno on error.
 574 */
 575int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
 576{
 577        int rc = 0;
 578        u8 scsi_cmd[MAX_COMMAND_SIZE];
 579        u8 args[7], *sensebuf = NULL;
 580        int cmd_result;
 581
 582        if (arg == NULL)
 583                return -EINVAL;
 584
 585        if (copy_from_user(args, arg, sizeof(args)))
 586                return -EFAULT;
 587
 588        sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
 589        if (!sensebuf)
 590                return -ENOMEM;
 591
 592        memset(scsi_cmd, 0, sizeof(scsi_cmd));
 593        scsi_cmd[0]  = ATA_16;
 594        scsi_cmd[1]  = (3 << 1); /* Non-data */
 595        scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
 596        scsi_cmd[4]  = args[1];
 597        scsi_cmd[6]  = args[2];
 598        scsi_cmd[8]  = args[3];
 599        scsi_cmd[10] = args[4];
 600        scsi_cmd[12] = args[5];
 601        scsi_cmd[13] = args[6] & 0x4f;
 602        scsi_cmd[14] = args[0];
 603
 604        /* Good values for timeout and retries?  Values below
 605           from scsi_ioctl_send_command() for default case... */
 606        cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
 607                                sensebuf, (10*HZ), 5, 0, NULL);
 608
 609        if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
 610                u8 *desc = sensebuf + 8;
 611                cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
 612
 613                /* If we set cc then ATA pass-through will cause a
 614                 * check condition even if no error. Filter that. */
 615                if (cmd_result & SAM_STAT_CHECK_CONDITION) {
 616                        struct scsi_sense_hdr sshdr;
 617                        scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
 618                                                &sshdr);
 619                        if (sshdr.sense_key == 0 &&
 620                                sshdr.asc == 0 && sshdr.ascq == 0)
 621                                cmd_result &= ~SAM_STAT_CHECK_CONDITION;
 622                }
 623
 624                /* Send userspace ATA registers */
 625                if (sensebuf[0] == 0x72 &&      /* format is "descriptor" */
 626                                desc[0] == 0x09) {/* code is "ATA Descriptor" */
 627                        args[0] = desc[13];     /* status */
 628                        args[1] = desc[3];      /* error */
 629                        args[2] = desc[5];      /* sector count (0:7) */
 630                        args[3] = desc[7];      /* lbal */
 631                        args[4] = desc[9];      /* lbam */
 632                        args[5] = desc[11];     /* lbah */
 633                        args[6] = desc[12];     /* select */
 634                        if (copy_to_user(arg, args, sizeof(args)))
 635                                rc = -EFAULT;
 636                }
 637        }
 638
 639        if (cmd_result) {
 640                rc = -EIO;
 641                goto error;
 642        }
 643
 644 error:
 645        kfree(sensebuf);
 646        return rc;
 647}
 648
 649static int ata_ioc32(struct ata_port *ap)
 650{
 651        if (ap->flags & ATA_FLAG_PIO_DMA)
 652                return 1;
 653        if (ap->pflags & ATA_PFLAG_PIO32)
 654                return 1;
 655        return 0;
 656}
 657
 658int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
 659                     int cmd, void __user *arg)
 660{
 661        int val = -EINVAL, rc = -EINVAL;
 662        unsigned long flags;
 663
 664        switch (cmd) {
 665        case ATA_IOC_GET_IO32:
 666                spin_lock_irqsave(ap->lock, flags);
 667                val = ata_ioc32(ap);
 668                spin_unlock_irqrestore(ap->lock, flags);
 669                if (copy_to_user(arg, &val, 1))
 670                        return -EFAULT;
 671                return 0;
 672
 673        case ATA_IOC_SET_IO32:
 674                val = (unsigned long) arg;
 675                rc = 0;
 676                spin_lock_irqsave(ap->lock, flags);
 677                if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
 678                        if (val)
 679                                ap->pflags |= ATA_PFLAG_PIO32;
 680                        else
 681                                ap->pflags &= ~ATA_PFLAG_PIO32;
 682                } else {
 683                        if (val != ata_ioc32(ap))
 684                                rc = -EINVAL;
 685                }
 686                spin_unlock_irqrestore(ap->lock, flags);
 687                return rc;
 688
 689        case HDIO_GET_IDENTITY:
 690                return ata_get_identity(ap, scsidev, arg);
 691
 692        case HDIO_DRIVE_CMD:
 693                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 694                        return -EACCES;
 695                return ata_cmd_ioctl(scsidev, arg);
 696
 697        case HDIO_DRIVE_TASK:
 698                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 699                        return -EACCES;
 700                return ata_task_ioctl(scsidev, arg);
 701
 702        default:
 703                rc = -ENOTTY;
 704                break;
 705        }
 706
 707        return rc;
 708}
 709EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
 710
 711int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
 712{
 713        return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
 714                                scsidev, cmd, arg);
 715}
 716EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
 717
 718/**
 719 *      ata_scsi_qc_new - acquire new ata_queued_cmd reference
 720 *      @dev: ATA device to which the new command is attached
 721 *      @cmd: SCSI command that originated this ATA command
 722 *
 723 *      Obtain a reference to an unused ata_queued_cmd structure,
 724 *      which is the basic libata structure representing a single
 725 *      ATA command sent to the hardware.
 726 *
 727 *      If a command was available, fill in the SCSI-specific
 728 *      portions of the structure with information on the
 729 *      current command.
 730 *
 731 *      LOCKING:
 732 *      spin_lock_irqsave(host lock)
 733 *
 734 *      RETURNS:
 735 *      Command allocated, or %NULL if none available.
 736 */
 737static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
 738                                              struct scsi_cmnd *cmd)
 739{
 740        struct ata_queued_cmd *qc;
 741
 742        qc = ata_qc_new_init(dev);
 743        if (qc) {
 744                qc->scsicmd = cmd;
 745                qc->scsidone = cmd->scsi_done;
 746
 747                qc->sg = scsi_sglist(cmd);
 748                qc->n_elem = scsi_sg_count(cmd);
 749        } else {
 750                cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
 751                cmd->scsi_done(cmd);
 752        }
 753
 754        return qc;
 755}
 756
 757static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
 758{
 759        struct scsi_cmnd *scmd = qc->scsicmd;
 760
 761        qc->extrabytes = scmd->request->extra_len;
 762        qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
 763}
 764
 765/**
 766 *      ata_dump_status - user friendly display of error info
 767 *      @id: id of the port in question
 768 *      @tf: ptr to filled out taskfile
 769 *
 770 *      Decode and dump the ATA error/status registers for the user so
 771 *      that they have some idea what really happened at the non
 772 *      make-believe layer.
 773 *
 774 *      LOCKING:
 775 *      inherited from caller
 776 */
 777static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
 778{
 779        u8 stat = tf->command, err = tf->feature;
 780
 781        printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
 782        if (stat & ATA_BUSY) {
 783                printk("Busy }\n");     /* Data is not valid in this case */
 784        } else {
 785                if (stat & 0x40)        printk("DriveReady ");
 786                if (stat & 0x20)        printk("DeviceFault ");
 787                if (stat & 0x10)        printk("SeekComplete ");
 788                if (stat & 0x08)        printk("DataRequest ");
 789                if (stat & 0x04)        printk("CorrectedError ");
 790                if (stat & 0x02)        printk("Index ");
 791                if (stat & 0x01)        printk("Error ");
 792                printk("}\n");
 793
 794                if (err) {
 795                        printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
 796                        if (err & 0x04)         printk("DriveStatusError ");
 797                        if (err & 0x80) {
 798                                if (err & 0x04) printk("BadCRC ");
 799                                else            printk("Sector ");
 800                        }
 801                        if (err & 0x40)         printk("UncorrectableError ");
 802                        if (err & 0x10)         printk("SectorIdNotFound ");
 803                        if (err & 0x02)         printk("TrackZeroNotFound ");
 804                        if (err & 0x01)         printk("AddrMarkNotFound ");
 805                        printk("}\n");
 806                }
 807        }
 808}
 809
 810/**
 811 *      ata_to_sense_error - convert ATA error to SCSI error
 812 *      @id: ATA device number
 813 *      @drv_stat: value contained in ATA status register
 814 *      @drv_err: value contained in ATA error register
 815 *      @sk: the sense key we'll fill out
 816 *      @asc: the additional sense code we'll fill out
 817 *      @ascq: the additional sense code qualifier we'll fill out
 818 *      @verbose: be verbose
 819 *
 820 *      Converts an ATA error into a SCSI error.  Fill out pointers to
 821 *      SK, ASC, and ASCQ bytes for later use in fixed or descriptor
 822 *      format sense blocks.
 823 *
 824 *      LOCKING:
 825 *      spin_lock_irqsave(host lock)
 826 */
 827static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
 828                               u8 *asc, u8 *ascq, int verbose)
 829{
 830        int i;
 831
 832        /* Based on the 3ware driver translation table */
 833        static const unsigned char sense_table[][4] = {
 834                /* BBD|ECC|ID|MAR */
 835                {0xd1,          ABORTED_COMMAND, 0x00, 0x00},   // Device busy                  Aborted command
 836                /* BBD|ECC|ID */
 837                {0xd0,          ABORTED_COMMAND, 0x00, 0x00},   // Device busy                  Aborted command
 838                /* ECC|MC|MARK */
 839                {0x61,          HARDWARE_ERROR, 0x00, 0x00},    // Device fault                 Hardware error
 840                /* ICRC|ABRT */         /* NB: ICRC & !ABRT is BBD */
 841                {0x84,          ABORTED_COMMAND, 0x47, 0x00},   // Data CRC error               SCSI parity error
 842                /* MC|ID|ABRT|TRK0|MARK */
 843                {0x37,          NOT_READY, 0x04, 0x00},         // Unit offline                 Not ready
 844                /* MCR|MARK */
 845                {0x09,          NOT_READY, 0x04, 0x00},         // Unrecovered disk error       Not ready
 846                /*  Bad address mark */
 847                {0x01,          MEDIUM_ERROR, 0x13, 0x00},      // Address mark not found       Address mark not found for data field
 848                /* TRK0 */
 849                {0x02,          HARDWARE_ERROR, 0x00, 0x00},    // Track 0 not found              Hardware error
 850                /* Abort & !ICRC */
 851                {0x04,          ABORTED_COMMAND, 0x00, 0x00},   // Aborted command              Aborted command
 852                /* Media change request */
 853                {0x08,          NOT_READY, 0x04, 0x00},         // Media change request   FIXME: faking offline
 854                /* SRV */
 855                {0x10,          ABORTED_COMMAND, 0x14, 0x00},   // ID not found                 Recorded entity not found
 856                /* Media change */
 857                {0x08,          NOT_READY, 0x04, 0x00},         // Media change           FIXME: faking offline
 858                /* ECC */
 859                {0x40,          MEDIUM_ERROR, 0x11, 0x04},      // Uncorrectable ECC error      Unrecovered read error
 860                /* BBD - block marked bad */
 861                {0x80,          MEDIUM_ERROR, 0x11, 0x04},      // Block marked bad               Medium error, unrecovered read error
 862                {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
 863        };
 864        static const unsigned char stat_table[][4] = {
 865                /* Must be first because BUSY means no other bits valid */
 866                {0x80,          ABORTED_COMMAND, 0x47, 0x00},   // Busy, fake parity for now
 867                {0x20,          HARDWARE_ERROR,  0x00, 0x00},   // Device fault
 868                {0x08,          ABORTED_COMMAND, 0x47, 0x00},   // Timed out in xfer, fake parity for now
 869                {0x04,          RECOVERED_ERROR, 0x11, 0x00},   // Recovered ECC error    Medium error, recovered
 870                {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
 871        };
 872
 873        /*
 874         *      Is this an error we can process/parse
 875         */
 876        if (drv_stat & ATA_BUSY) {
 877                drv_err = 0;    /* Ignore the err bits, they're invalid */
 878        }
 879
 880        if (drv_err) {
 881                /* Look for drv_err */
 882                for (i = 0; sense_table[i][0] != 0xFF; i++) {
 883                        /* Look for best matches first */
 884                        if ((sense_table[i][0] & drv_err) ==
 885                            sense_table[i][0]) {
 886                                *sk = sense_table[i][1];
 887                                *asc = sense_table[i][2];
 888                                *ascq = sense_table[i][3];
 889                                goto translate_done;
 890                        }
 891                }
 892                /* No immediate match */
 893                if (verbose)
 894                        printk(KERN_WARNING "ata%u: no sense translation for "
 895                               "error 0x%02x\n", id, drv_err);
 896        }
 897
 898        /* Fall back to interpreting status bits */
 899        for (i = 0; stat_table[i][0] != 0xFF; i++) {
 900                if (stat_table[i][0] & drv_stat) {
 901                        *sk = stat_table[i][1];
 902                        *asc = stat_table[i][2];
 903                        *ascq = stat_table[i][3];
 904                        goto translate_done;
 905                }
 906        }
 907        /* No error?  Undecoded? */
 908        if (verbose)
 909                printk(KERN_WARNING "ata%u: no sense translation for "
 910                       "status: 0x%02x\n", id, drv_stat);
 911
 912        /* We need a sensible error return here, which is tricky, and one
 913           that won't cause people to do things like return a disk wrongly */
 914        *sk = ABORTED_COMMAND;
 915        *asc = 0x00;
 916        *ascq = 0x00;
 917
 918 translate_done:
 919        if (verbose)
 920                printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
 921                       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
 922                       id, drv_stat, drv_err, *sk, *asc, *ascq);
 923        return;
 924}
 925
 926/*
 927 *      ata_gen_passthru_sense - Generate check condition sense block.
 928 *      @qc: Command that completed.
 929 *
 930 *      This function is specific to the ATA descriptor format sense
 931 *      block specified for the ATA pass through commands.  Regardless
 932 *      of whether the command errored or not, return a sense
 933 *      block. Copy all controller registers into the sense
 934 *      block. Clear sense key, ASC & ASCQ if there is no error.
 935 *
 936 *      LOCKING:
 937 *      None.
 938 */
 939static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
 940{
 941        struct scsi_cmnd *cmd = qc->scsicmd;
 942        struct ata_taskfile *tf = &qc->result_tf;
 943        unsigned char *sb = cmd->sense_buffer;
 944        unsigned char *desc = sb + 8;
 945        int verbose = qc->ap->ops->error_handler == NULL;
 946
 947        memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 948
 949        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 950
 951        /*
 952         * Use ata_to_sense_error() to map status register bits
 953         * onto sense key, asc & ascq.
 954         */
 955        if (qc->err_mask ||
 956            tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
 957                ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
 958                                   &sb[1], &sb[2], &sb[3], verbose);
 959                sb[1] &= 0x0f;
 960        }
 961
 962        /*
 963         * Sense data is current and format is descriptor.
 964         */
 965        sb[0] = 0x72;
 966
 967        desc[0] = 0x09;
 968
 969        /* set length of additional sense data */
 970        sb[7] = 14;
 971        desc[1] = 12;
 972
 973        /*
 974         * Copy registers into sense buffer.
 975         */
 976        desc[2] = 0x00;
 977        desc[3] = tf->feature;  /* == error reg */
 978        desc[5] = tf->nsect;
 979        desc[7] = tf->lbal;
 980        desc[9] = tf->lbam;
 981        desc[11] = tf->lbah;
 982        desc[12] = tf->device;
 983        desc[13] = tf->command; /* == status reg */
 984
 985        /*
 986         * Fill in Extend bit, and the high order bytes
 987         * if applicable.
 988         */
 989        if (tf->flags & ATA_TFLAG_LBA48) {
 990                desc[2] |= 0x01;
 991                desc[4] = tf->hob_nsect;
 992                desc[6] = tf->hob_lbal;
 993                desc[8] = tf->hob_lbam;
 994                desc[10] = tf->hob_lbah;
 995        }
 996}
 997
 998/**
 999 *      ata_gen_ata_sense - generate a SCSI fixed sense block
1000 *      @qc: Command that we are erroring out
1001 *
1002 *      Generate sense block for a failed ATA command @qc.  Descriptor
1003 *      format is used to accommodate LBA48 block address.
1004 *
1005 *      LOCKING:
1006 *      None.
1007 */
1008static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1009{
1010        struct ata_device *dev = qc->dev;
1011        struct scsi_cmnd *cmd = qc->scsicmd;
1012        struct ata_taskfile *tf = &qc->result_tf;
1013        unsigned char *sb = cmd->sense_buffer;
1014        unsigned char *desc = sb + 8;
1015        int verbose = qc->ap->ops->error_handler == NULL;
1016        u64 block;
1017
1018        memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1019
1020        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1021
1022        /* sense data is current and format is descriptor */
1023        sb[0] = 0x72;
1024
1025        /* Use ata_to_sense_error() to map status register bits
1026         * onto sense key, asc & ascq.
1027         */
1028        if (qc->err_mask ||
1029            tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1030                ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1031                                   &sb[1], &sb[2], &sb[3], verbose);
1032                sb[1] &= 0x0f;
1033        }
1034
1035        block = ata_tf_read_block(&qc->result_tf, dev);
1036
1037        /* information sense data descriptor */
1038        sb[7] = 12;
1039        desc[0] = 0x00;
1040        desc[1] = 10;
1041
1042        desc[2] |= 0x80;        /* valid */
1043        desc[6] = block >> 40;
1044        desc[7] = block >> 32;
1045        desc[8] = block >> 24;
1046        desc[9] = block >> 16;
1047        desc[10] = block >> 8;
1048        desc[11] = block;
1049}
1050
1051static void ata_scsi_sdev_config(struct scsi_device *sdev)
1052{
1053        sdev->use_10_for_rw = 1;
1054        sdev->use_10_for_ms = 1;
1055
1056        /* Schedule policy is determined by ->qc_defer() callback and
1057         * it needs to see every deferred qc.  Set dev_blocked to 1 to
1058         * prevent SCSI midlayer from automatically deferring
1059         * requests.
1060         */
1061        sdev->max_device_blocked = 1;
1062}
1063
1064/**
1065 *      atapi_drain_needed - Check whether data transfer may overflow
1066 *      @rq: request to be checked
1067 *
1068 *      ATAPI commands which transfer variable length data to host
1069 *      might overflow due to application error or hardare bug.  This
1070 *      function checks whether overflow should be drained and ignored
1071 *      for @request.
1072 *
1073 *      LOCKING:
1074 *      None.
1075 *
1076 *      RETURNS:
1077 *      1 if ; otherwise, 0.
1078 */
1079static int atapi_drain_needed(struct request *rq)
1080{
1081        if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1082                return 0;
1083
1084        if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1085                return 0;
1086
1087        return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1088}
1089
1090static int ata_scsi_dev_config(struct scsi_device *sdev,
1091                               struct ata_device *dev)
1092{
1093        struct request_queue *q = sdev->request_queue;
1094
1095        if (!ata_id_has_unload(dev->id))
1096                dev->flags |= ATA_DFLAG_NO_UNLOAD;
1097
1098        /* configure max sectors */
1099        blk_queue_max_hw_sectors(q, dev->max_sectors);
1100
1101        if (dev->class == ATA_DEV_ATAPI) {
1102                void *buf;
1103
1104                sdev->sector_size = ATA_SECT_SIZE;
1105
1106                /* set DMA padding */
1107                blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1108
1109                /* configure draining */
1110                buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1111                if (!buf) {
1112                        ata_dev_err(dev, "drain buffer allocation failed\n");
1113                        return -ENOMEM;
1114                }
1115
1116                blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1117        } else {
1118                sdev->sector_size = ata_id_logical_sector_size(dev->id);
1119                sdev->manage_start_stop = 1;
1120        }
1121
1122        /*
1123         * ata_pio_sectors() expects buffer for each sector to not cross
1124         * page boundary.  Enforce it by requiring buffers to be sector
1125         * aligned, which works iff sector_size is not larger than
1126         * PAGE_SIZE.  ATAPI devices also need the alignment as
1127         * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1128         */
1129        if (sdev->sector_size > PAGE_SIZE)
1130                ata_dev_warn(dev,
1131                        "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1132                        sdev->sector_size);
1133
1134        blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1135
1136        if (dev->flags & ATA_DFLAG_AN)
1137                set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1138
1139        if (dev->flags & ATA_DFLAG_NCQ) {
1140                int depth;
1141
1142                depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1143                depth = min(ATA_MAX_QUEUE - 1, depth);
1144                scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1145        }
1146
1147        blk_queue_flush_queueable(q, false);
1148
1149        dev->sdev = sdev;
1150        return 0;
1151}
1152
1153/**
1154 *      ata_scsi_slave_config - Set SCSI device attributes
1155 *      @sdev: SCSI device to examine
1156 *
1157 *      This is called before we actually start reading
1158 *      and writing to the device, to configure certain
1159 *      SCSI mid-layer behaviors.
1160 *
1161 *      LOCKING:
1162 *      Defined by SCSI layer.  We don't really care.
1163 */
1164
1165int ata_scsi_slave_config(struct scsi_device *sdev)
1166{
1167        struct ata_port *ap = ata_shost_to_port(sdev->host);
1168        struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1169        int rc = 0;
1170
1171        ata_scsi_sdev_config(sdev);
1172
1173        if (dev)
1174                rc = ata_scsi_dev_config(sdev, dev);
1175
1176        return rc;
1177}
1178
1179/**
1180 *      ata_scsi_slave_destroy - SCSI device is about to be destroyed
1181 *      @sdev: SCSI device to be destroyed
1182 *
1183 *      @sdev is about to be destroyed for hot/warm unplugging.  If
1184 *      this unplugging was initiated by libata as indicated by NULL
1185 *      dev->sdev, this function doesn't have to do anything.
1186 *      Otherwise, SCSI layer initiated warm-unplug is in progress.
1187 *      Clear dev->sdev, schedule the device for ATA detach and invoke
1188 *      EH.
1189 *
1190 *      LOCKING:
1191 *      Defined by SCSI layer.  We don't really care.
1192 */
1193void ata_scsi_slave_destroy(struct scsi_device *sdev)
1194{
1195        struct ata_port *ap = ata_shost_to_port(sdev->host);
1196        struct request_queue *q = sdev->request_queue;
1197        unsigned long flags;
1198        struct ata_device *dev;
1199
1200        if (!ap->ops->error_handler)
1201                return;
1202
1203        spin_lock_irqsave(ap->lock, flags);
1204        dev = __ata_scsi_find_dev(ap, sdev);
1205        if (dev && dev->sdev) {
1206                /* SCSI device already in CANCEL state, no need to offline it */
1207                dev->sdev = NULL;
1208                dev->flags |= ATA_DFLAG_DETACH;
1209                ata_port_schedule_eh(ap);
1210        }
1211        spin_unlock_irqrestore(ap->lock, flags);
1212
1213        kfree(q->dma_drain_buffer);
1214        q->dma_drain_buffer = NULL;
1215        q->dma_drain_size = 0;
1216}
1217
1218/**
1219 *      __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1220 *      @ap: ATA port to which the device change the queue depth
1221 *      @sdev: SCSI device to configure queue depth for
1222 *      @queue_depth: new queue depth
1223 *      @reason: calling context
1224 *
1225 *      libsas and libata have different approaches for associating a sdev to
1226 *      its ata_port.
1227 *
1228 */
1229int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1230                             int queue_depth, int reason)
1231{
1232        struct ata_device *dev;
1233        unsigned long flags;
1234
1235        if (reason != SCSI_QDEPTH_DEFAULT)
1236                return -EOPNOTSUPP;
1237
1238        if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1239                return sdev->queue_depth;
1240
1241        dev = ata_scsi_find_dev(ap, sdev);
1242        if (!dev || !ata_dev_enabled(dev))
1243                return sdev->queue_depth;
1244
1245        /* NCQ enabled? */
1246        spin_lock_irqsave(ap->lock, flags);
1247        dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1248        if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1249                dev->flags |= ATA_DFLAG_NCQ_OFF;
1250                queue_depth = 1;
1251        }
1252        spin_unlock_irqrestore(ap->lock, flags);
1253
1254        /* limit and apply queue depth */
1255        queue_depth = min(queue_depth, sdev->host->can_queue);
1256        queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1257        queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1258
1259        if (sdev->queue_depth == queue_depth)
1260                return -EINVAL;
1261
1262        scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1263        return queue_depth;
1264}
1265
1266/**
1267 *      ata_scsi_change_queue_depth - SCSI callback for queue depth config
1268 *      @sdev: SCSI device to configure queue depth for
1269 *      @queue_depth: new queue depth
1270 *      @reason: calling context
1271 *
1272 *      This is libata standard hostt->change_queue_depth callback.
1273 *      SCSI will call into this callback when user tries to set queue
1274 *      depth via sysfs.
1275 *
1276 *      LOCKING:
1277 *      SCSI layer (we don't care)
1278 *
1279 *      RETURNS:
1280 *      Newly configured queue depth.
1281 */
1282int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1283                                int reason)
1284{
1285        struct ata_port *ap = ata_shost_to_port(sdev->host);
1286
1287        return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1288}
1289
1290/**
1291 *      ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1292 *      @qc: Storage for translated ATA taskfile
1293 *
1294 *      Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1295 *      (to start). Perhaps these commands should be preceded by
1296 *      CHECK POWER MODE to see what power mode the device is already in.
1297 *      [See SAT revision 5 at www.t10.org]
1298 *
1299 *      LOCKING:
1300 *      spin_lock_irqsave(host lock)
1301 *
1302 *      RETURNS:
1303 *      Zero on success, non-zero on error.
1304 */
1305static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1306{
1307        struct scsi_cmnd *scmd = qc->scsicmd;
1308        struct ata_taskfile *tf = &qc->tf;
1309        const u8 *cdb = scmd->cmnd;
1310
1311        if (scmd->cmd_len < 5)
1312                goto invalid_fld;
1313
1314        tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1315        tf->protocol = ATA_PROT_NODATA;
1316        if (cdb[1] & 0x1) {
1317                ;       /* ignore IMMED bit, violates sat-r05 */
1318        }
1319        if (cdb[4] & 0x2)
1320                goto invalid_fld;       /* LOEJ bit set not supported */
1321        if (((cdb[4] >> 4) & 0xf) != 0)
1322                goto invalid_fld;       /* power conditions not supported */
1323
1324        if (cdb[4] & 0x1) {
1325                tf->nsect = 1;  /* 1 sector, lba=0 */
1326
1327                if (qc->dev->flags & ATA_DFLAG_LBA) {
1328                        tf->flags |= ATA_TFLAG_LBA;
1329
1330                        tf->lbah = 0x0;
1331                        tf->lbam = 0x0;
1332                        tf->lbal = 0x0;
1333                        tf->device |= ATA_LBA;
1334                } else {
1335                        /* CHS */
1336                        tf->lbal = 0x1; /* sect */
1337                        tf->lbam = 0x0; /* cyl low */
1338                        tf->lbah = 0x0; /* cyl high */
1339                }
1340
1341                tf->command = ATA_CMD_VERIFY;   /* READ VERIFY */
1342        } else {
1343                /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1344                 * or S5) causing some drives to spin up and down again.
1345                 */
1346                if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1347                    system_state == SYSTEM_POWER_OFF)
1348                        goto skip;
1349
1350                if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1351                     system_entering_hibernation())
1352                        goto skip;
1353
1354                /* Issue ATA STANDBY IMMEDIATE command */
1355                tf->command = ATA_CMD_STANDBYNOW1;
1356        }
1357
1358        /*
1359         * Standby and Idle condition timers could be implemented but that
1360         * would require libata to implement the Power condition mode page
1361         * and allow the user to change it. Changing mode pages requires
1362         * MODE SELECT to be implemented.
1363         */
1364
1365        return 0;
1366
1367 invalid_fld:
1368        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1369        /* "Invalid field in cbd" */
1370        return 1;
1371 skip:
1372        scmd->result = SAM_STAT_GOOD;
1373        return 1;
1374}
1375
1376
1377/**
1378 *      ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1379 *      @qc: Storage for translated ATA taskfile
1380 *
1381 *      Sets up an ATA taskfile to issue FLUSH CACHE or
1382 *      FLUSH CACHE EXT.
1383 *
1384 *      LOCKING:
1385 *      spin_lock_irqsave(host lock)
1386 *
1387 *      RETURNS:
1388 *      Zero on success, non-zero on error.
1389 */
1390static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1391{
1392        struct ata_taskfile *tf = &qc->tf;
1393
1394        tf->flags |= ATA_TFLAG_DEVICE;
1395        tf->protocol = ATA_PROT_NODATA;
1396
1397        if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1398                tf->command = ATA_CMD_FLUSH_EXT;
1399        else
1400                tf->command = ATA_CMD_FLUSH;
1401
1402        /* flush is critical for IO integrity, consider it an IO command */
1403        qc->flags |= ATA_QCFLAG_IO;
1404
1405        return 0;
1406}
1407
1408/**
1409 *      scsi_6_lba_len - Get LBA and transfer length
1410 *      @cdb: SCSI command to translate
1411 *
1412 *      Calculate LBA and transfer length for 6-byte commands.
1413 *
1414 *      RETURNS:
1415 *      @plba: the LBA
1416 *      @plen: the transfer length
1417 */
1418static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1419{
1420        u64 lba = 0;
1421        u32 len;
1422
1423        VPRINTK("six-byte command\n");
1424
1425        lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1426        lba |= ((u64)cdb[2]) << 8;
1427        lba |= ((u64)cdb[3]);
1428
1429        len = cdb[4];
1430
1431        *plba = lba;
1432        *plen = len;
1433}
1434
1435/**
1436 *      scsi_10_lba_len - Get LBA and transfer length
1437 *      @cdb: SCSI command to translate
1438 *
1439 *      Calculate LBA and transfer length for 10-byte commands.
1440 *
1441 *      RETURNS:
1442 *      @plba: the LBA
1443 *      @plen: the transfer length
1444 */
1445static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1446{
1447        u64 lba = 0;
1448        u32 len = 0;
1449
1450        VPRINTK("ten-byte command\n");
1451
1452        lba |= ((u64)cdb[2]) << 24;
1453        lba |= ((u64)cdb[3]) << 16;
1454        lba |= ((u64)cdb[4]) << 8;
1455        lba |= ((u64)cdb[5]);
1456
1457        len |= ((u32)cdb[7]) << 8;
1458        len |= ((u32)cdb[8]);
1459
1460        *plba = lba;
1461        *plen = len;
1462}
1463
1464/**
1465 *      scsi_16_lba_len - Get LBA and transfer length
1466 *      @cdb: SCSI command to translate
1467 *
1468 *      Calculate LBA and transfer length for 16-byte commands.
1469 *
1470 *      RETURNS:
1471 *      @plba: the LBA
1472 *      @plen: the transfer length
1473 */
1474static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1475{
1476        u64 lba = 0;
1477        u32 len = 0;
1478
1479        VPRINTK("sixteen-byte command\n");
1480
1481        lba |= ((u64)cdb[2]) << 56;
1482        lba |= ((u64)cdb[3]) << 48;
1483        lba |= ((u64)cdb[4]) << 40;
1484        lba |= ((u64)cdb[5]) << 32;
1485        lba |= ((u64)cdb[6]) << 24;
1486        lba |= ((u64)cdb[7]) << 16;
1487        lba |= ((u64)cdb[8]) << 8;
1488        lba |= ((u64)cdb[9]);
1489
1490        len |= ((u32)cdb[10]) << 24;
1491        len |= ((u32)cdb[11]) << 16;
1492        len |= ((u32)cdb[12]) << 8;
1493        len |= ((u32)cdb[13]);
1494
1495        *plba = lba;
1496        *plen = len;
1497}
1498
1499/**
1500 *      ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1501 *      @qc: Storage for translated ATA taskfile
1502 *
1503 *      Converts SCSI VERIFY command to an ATA READ VERIFY command.
1504 *
1505 *      LOCKING:
1506 *      spin_lock_irqsave(host lock)
1507 *
1508 *      RETURNS:
1509 *      Zero on success, non-zero on error.
1510 */
1511static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1512{
1513        struct scsi_cmnd *scmd = qc->scsicmd;
1514        struct ata_taskfile *tf = &qc->tf;
1515        struct ata_device *dev = qc->dev;
1516        u64 dev_sectors = qc->dev->n_sectors;
1517        const u8 *cdb = scmd->cmnd;
1518        u64 block;
1519        u32 n_block;
1520
1521        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1522        tf->protocol = ATA_PROT_NODATA;
1523
1524        if (cdb[0] == VERIFY) {
1525                if (scmd->cmd_len < 10)
1526                        goto invalid_fld;
1527                scsi_10_lba_len(cdb, &block, &n_block);
1528        } else if (cdb[0] == VERIFY_16) {
1529                if (scmd->cmd_len < 16)
1530                        goto invalid_fld;
1531                scsi_16_lba_len(cdb, &block, &n_block);
1532        } else
1533                goto invalid_fld;
1534
1535        if (!n_block)
1536                goto nothing_to_do;
1537        if (block >= dev_sectors)
1538                goto out_of_range;
1539        if ((block + n_block) > dev_sectors)
1540                goto out_of_range;
1541
1542        if (dev->flags & ATA_DFLAG_LBA) {
1543                tf->flags |= ATA_TFLAG_LBA;
1544
1545                if (lba_28_ok(block, n_block)) {
1546                        /* use LBA28 */
1547                        tf->command = ATA_CMD_VERIFY;
1548                        tf->device |= (block >> 24) & 0xf;
1549                } else if (lba_48_ok(block, n_block)) {
1550                        if (!(dev->flags & ATA_DFLAG_LBA48))
1551                                goto out_of_range;
1552
1553                        /* use LBA48 */
1554                        tf->flags |= ATA_TFLAG_LBA48;
1555                        tf->command = ATA_CMD_VERIFY_EXT;
1556
1557                        tf->hob_nsect = (n_block >> 8) & 0xff;
1558
1559                        tf->hob_lbah = (block >> 40) & 0xff;
1560                        tf->hob_lbam = (block >> 32) & 0xff;
1561                        tf->hob_lbal = (block >> 24) & 0xff;
1562                } else
1563                        /* request too large even for LBA48 */
1564                        goto out_of_range;
1565
1566                tf->nsect = n_block & 0xff;
1567
1568                tf->lbah = (block >> 16) & 0xff;
1569                tf->lbam = (block >> 8) & 0xff;
1570                tf->lbal = block & 0xff;
1571
1572                tf->device |= ATA_LBA;
1573        } else {
1574                /* CHS */
1575                u32 sect, head, cyl, track;
1576
1577                if (!lba_28_ok(block, n_block))
1578                        goto out_of_range;
1579
1580                /* Convert LBA to CHS */
1581                track = (u32)block / dev->sectors;
1582                cyl   = track / dev->heads;
1583                head  = track % dev->heads;
1584                sect  = (u32)block % dev->sectors + 1;
1585
1586                DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1587                        (u32)block, track, cyl, head, sect);
1588
1589                /* Check whether the converted CHS can fit.
1590                   Cylinder: 0-65535
1591                   Head: 0-15
1592                   Sector: 1-255*/
1593                if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1594                        goto out_of_range;
1595
1596                tf->command = ATA_CMD_VERIFY;
1597                tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1598                tf->lbal = sect;
1599                tf->lbam = cyl;
1600                tf->lbah = cyl >> 8;
1601                tf->device |= head;
1602        }
1603
1604        return 0;
1605
1606invalid_fld:
1607        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1608        /* "Invalid field in cbd" */
1609        return 1;
1610
1611out_of_range:
1612        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1613        /* "Logical Block Address out of range" */
1614        return 1;
1615
1616nothing_to_do:
1617        scmd->result = SAM_STAT_GOOD;
1618        return 1;
1619}
1620
1621/**
1622 *      ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1623 *      @qc: Storage for translated ATA taskfile
1624 *
1625 *      Converts any of six SCSI read/write commands into the
1626 *      ATA counterpart, including starting sector (LBA),
1627 *      sector count, and taking into account the device's LBA48
1628 *      support.
1629 *
1630 *      Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1631 *      %WRITE_16 are currently supported.
1632 *
1633 *      LOCKING:
1634 *      spin_lock_irqsave(host lock)
1635 *
1636 *      RETURNS:
1637 *      Zero on success, non-zero on error.
1638 */
1639static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1640{
1641        struct scsi_cmnd *scmd = qc->scsicmd;
1642        const u8 *cdb = scmd->cmnd;
1643        unsigned int tf_flags = 0;
1644        u64 block;
1645        u32 n_block;
1646        int rc;
1647
1648        if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1649                tf_flags |= ATA_TFLAG_WRITE;
1650
1651        /* Calculate the SCSI LBA, transfer length and FUA. */
1652        switch (cdb[0]) {
1653        case READ_10:
1654        case WRITE_10:
1655                if (unlikely(scmd->cmd_len < 10))
1656                        goto invalid_fld;
1657                scsi_10_lba_len(cdb, &block, &n_block);
1658                if (unlikely(cdb[1] & (1 << 3)))
1659                        tf_flags |= ATA_TFLAG_FUA;
1660                break;
1661        case READ_6:
1662        case WRITE_6:
1663                if (unlikely(scmd->cmd_len < 6))
1664                        goto invalid_fld;
1665                scsi_6_lba_len(cdb, &block, &n_block);
1666
1667                /* for 6-byte r/w commands, transfer length 0
1668                 * means 256 blocks of data, not 0 block.
1669                 */
1670                if (!n_block)
1671                        n_block = 256;
1672                break;
1673        case READ_16:
1674        case WRITE_16:
1675                if (unlikely(scmd->cmd_len < 16))
1676                        goto invalid_fld;
1677                scsi_16_lba_len(cdb, &block, &n_block);
1678                if (unlikely(cdb[1] & (1 << 3)))
1679                        tf_flags |= ATA_TFLAG_FUA;
1680                break;
1681        default:
1682                DPRINTK("no-byte command\n");
1683                goto invalid_fld;
1684        }
1685
1686        /* Check and compose ATA command */
1687        if (!n_block)
1688                /* For 10-byte and 16-byte SCSI R/W commands, transfer
1689                 * length 0 means transfer 0 block of data.
1690                 * However, for ATA R/W commands, sector count 0 means
1691                 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1692                 *
1693                 * WARNING: one or two older ATA drives treat 0 as 0...
1694                 */
1695                goto nothing_to_do;
1696
1697        qc->flags |= ATA_QCFLAG_IO;
1698        qc->nbytes = n_block * scmd->device->sector_size;
1699
1700        rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1701                             qc->tag);
1702        if (likely(rc == 0))
1703                return 0;
1704
1705        if (rc == -ERANGE)
1706                goto out_of_range;
1707        /* treat all other errors as -EINVAL, fall through */
1708invalid_fld:
1709        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1710        /* "Invalid field in cbd" */
1711        return 1;
1712
1713out_of_range:
1714        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1715        /* "Logical Block Address out of range" */
1716        return 1;
1717
1718nothing_to_do:
1719        scmd->result = SAM_STAT_GOOD;
1720        return 1;
1721}
1722
1723static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1724{
1725        struct ata_port *ap = qc->ap;
1726        struct scsi_cmnd *cmd = qc->scsicmd;
1727        u8 *cdb = cmd->cmnd;
1728        int need_sense = (qc->err_mask != 0);
1729
1730        /* For ATA pass thru (SAT) commands, generate a sense block if
1731         * user mandated it or if there's an error.  Note that if we
1732         * generate because the user forced us to, a check condition
1733         * is generated and the ATA register values are returned
1734         * whether the command completed successfully or not. If there
1735         * was no error, SK, ASC and ASCQ will all be zero.
1736         */
1737        if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1738            ((cdb[2] & 0x20) || need_sense)) {
1739                ata_gen_passthru_sense(qc);
1740        } else {
1741                if (!need_sense) {
1742                        cmd->result = SAM_STAT_GOOD;
1743                } else {
1744                        /* TODO: decide which descriptor format to use
1745                         * for 48b LBA devices and call that here
1746                         * instead of the fixed desc, which is only
1747                         * good for smaller LBA (and maybe CHS?)
1748                         * devices.
1749                         */
1750                        ata_gen_ata_sense(qc);
1751                }
1752        }
1753
1754        if (need_sense && !ap->ops->error_handler)
1755                ata_dump_status(ap->print_id, &qc->result_tf);
1756
1757        qc->scsidone(cmd);
1758
1759        ata_qc_free(qc);
1760}
1761
1762/**
1763 *      ata_scsi_translate - Translate then issue SCSI command to ATA device
1764 *      @dev: ATA device to which the command is addressed
1765 *      @cmd: SCSI command to execute
1766 *      @xlat_func: Actor which translates @cmd to an ATA taskfile
1767 *
1768 *      Our ->queuecommand() function has decided that the SCSI
1769 *      command issued can be directly translated into an ATA
1770 *      command, rather than handled internally.
1771 *
1772 *      This function sets up an ata_queued_cmd structure for the
1773 *      SCSI command, and sends that ata_queued_cmd to the hardware.
1774 *
1775 *      The xlat_func argument (actor) returns 0 if ready to execute
1776 *      ATA command, else 1 to finish translation. If 1 is returned
1777 *      then cmd->result (and possibly cmd->sense_buffer) are assumed
1778 *      to be set reflecting an error condition or clean (early)
1779 *      termination.
1780 *
1781 *      LOCKING:
1782 *      spin_lock_irqsave(host lock)
1783 *
1784 *      RETURNS:
1785 *      0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1786 *      needs to be deferred.
1787 */
1788static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1789                              ata_xlat_func_t xlat_func)
1790{
1791        struct ata_port *ap = dev->link->ap;
1792        struct ata_queued_cmd *qc;
1793        int rc;
1794
1795        VPRINTK("ENTER\n");
1796
1797        qc = ata_scsi_qc_new(dev, cmd);
1798        if (!qc)
1799                goto err_mem;
1800
1801        /* data is present; dma-map it */
1802        if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1803            cmd->sc_data_direction == DMA_TO_DEVICE) {
1804                if (unlikely(scsi_bufflen(cmd) < 1)) {
1805                        ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1806                        goto err_did;
1807                }
1808
1809                ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1810
1811                qc->dma_dir = cmd->sc_data_direction;
1812        }
1813
1814        qc->complete_fn = ata_scsi_qc_complete;
1815
1816        if (xlat_func(qc))
1817                goto early_finish;
1818
1819        if (ap->ops->qc_defer) {
1820                if ((rc = ap->ops->qc_defer(qc)))
1821                        goto defer;
1822        }
1823
1824        /* select device, send command to hardware */
1825        ata_qc_issue(qc);
1826
1827        VPRINTK("EXIT\n");
1828        return 0;
1829
1830early_finish:
1831        ata_qc_free(qc);
1832        cmd->scsi_done(cmd);
1833        DPRINTK("EXIT - early finish (good or error)\n");
1834        return 0;
1835
1836err_did:
1837        ata_qc_free(qc);
1838        cmd->result = (DID_ERROR << 16);
1839        cmd->scsi_done(cmd);
1840err_mem:
1841        DPRINTK("EXIT - internal\n");
1842        return 0;
1843
1844defer:
1845        ata_qc_free(qc);
1846        DPRINTK("EXIT - defer\n");
1847        if (rc == ATA_DEFER_LINK)
1848                return SCSI_MLQUEUE_DEVICE_BUSY;
1849        else
1850                return SCSI_MLQUEUE_HOST_BUSY;
1851}
1852
1853/**
1854 *      ata_scsi_rbuf_get - Map response buffer.
1855 *      @cmd: SCSI command containing buffer to be mapped.
1856 *      @flags: unsigned long variable to store irq enable status
1857 *      @copy_in: copy in from user buffer
1858 *
1859 *      Prepare buffer for simulated SCSI commands.
1860 *
1861 *      LOCKING:
1862 *      spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1863 *
1864 *      RETURNS:
1865 *      Pointer to response buffer.
1866 */
1867static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1868                               unsigned long *flags)
1869{
1870        spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1871
1872        memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1873        if (copy_in)
1874                sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1875                                  ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1876        return ata_scsi_rbuf;
1877}
1878
1879/**
1880 *      ata_scsi_rbuf_put - Unmap response buffer.
1881 *      @cmd: SCSI command containing buffer to be unmapped.
1882 *      @copy_out: copy out result
1883 *      @flags: @flags passed to ata_scsi_rbuf_get()
1884 *
1885 *      Returns rbuf buffer.  The result is copied to @cmd's buffer if
1886 *      @copy_back is true.
1887 *
1888 *      LOCKING:
1889 *      Unlocks ata_scsi_rbuf_lock.
1890 */
1891static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1892                                     unsigned long *flags)
1893{
1894        if (copy_out)
1895                sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1896                                    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1897        spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1898}
1899
1900/**
1901 *      ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1902 *      @args: device IDENTIFY data / SCSI command of interest.
1903 *      @actor: Callback hook for desired SCSI command simulator
1904 *
1905 *      Takes care of the hard work of simulating a SCSI command...
1906 *      Mapping the response buffer, calling the command's handler,
1907 *      and handling the handler's return value.  This return value
1908 *      indicates whether the handler wishes the SCSI command to be
1909 *      completed successfully (0), or not (in which case cmd->result
1910 *      and sense buffer are assumed to be set).
1911 *
1912 *      LOCKING:
1913 *      spin_lock_irqsave(host lock)
1914 */
1915static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1916                unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1917{
1918        u8 *rbuf;
1919        unsigned int rc;
1920        struct scsi_cmnd *cmd = args->cmd;
1921        unsigned long flags;
1922
1923        rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1924        rc = actor(args, rbuf);
1925        ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1926
1927        if (rc == 0)
1928                cmd->result = SAM_STAT_GOOD;
1929        args->done(cmd);
1930}
1931
1932/**
1933 *      ata_scsiop_inq_std - Simulate INQUIRY command
1934 *      @args: device IDENTIFY data / SCSI command of interest.
1935 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1936 *
1937 *      Returns standard device identification data associated
1938 *      with non-VPD INQUIRY command output.
1939 *
1940 *      LOCKING:
1941 *      spin_lock_irqsave(host lock)
1942 */
1943static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1944{
1945        const u8 versions[] = {
1946                0x60,   /* SAM-3 (no version claimed) */
1947
1948                0x03,
1949                0x20,   /* SBC-2 (no version claimed) */
1950
1951                0x02,
1952                0x60    /* SPC-3 (no version claimed) */
1953        };
1954        u8 hdr[] = {
1955                TYPE_DISK,
1956                0,
1957                0x5,    /* claim SPC-3 version compatibility */
1958                2,
1959                95 - 4
1960        };
1961
1962        VPRINTK("ENTER\n");
1963
1964        /* set scsi removeable (RMB) bit per ata bit */
1965        if (ata_id_removeable(args->id))
1966                hdr[1] |= (1 << 7);
1967
1968        memcpy(rbuf, hdr, sizeof(hdr));
1969        memcpy(&rbuf[8], "ATA     ", 8);
1970        ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1971        ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1972
1973        if (rbuf[32] == 0 || rbuf[32] == ' ')
1974                memcpy(&rbuf[32], "n/a ", 4);
1975
1976        memcpy(rbuf + 59, versions, sizeof(versions));
1977
1978        return 0;
1979}
1980
1981/**
1982 *      ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1983 *      @args: device IDENTIFY data / SCSI command of interest.
1984 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1985 *
1986 *      Returns list of inquiry VPD pages available.
1987 *
1988 *      LOCKING:
1989 *      spin_lock_irqsave(host lock)
1990 */
1991static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1992{
1993        const u8 pages[] = {
1994                0x00,   /* page 0x00, this page */
1995                0x80,   /* page 0x80, unit serial no page */
1996                0x83,   /* page 0x83, device ident page */
1997                0x89,   /* page 0x89, ata info page */
1998                0xb0,   /* page 0xb0, block limits page */
1999                0xb1,   /* page 0xb1, block device characteristics page */
2000                0xb2,   /* page 0xb2, thin provisioning page */
2001        };
2002
2003        rbuf[3] = sizeof(pages);        /* number of supported VPD pages */
2004        memcpy(rbuf + 4, pages, sizeof(pages));
2005        return 0;
2006}
2007
2008/**
2009 *      ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2010 *      @args: device IDENTIFY data / SCSI command of interest.
2011 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2012 *
2013 *      Returns ATA device serial number.
2014 *
2015 *      LOCKING:
2016 *      spin_lock_irqsave(host lock)
2017 */
2018static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2019{
2020        const u8 hdr[] = {
2021                0,
2022                0x80,                   /* this page code */
2023                0,
2024                ATA_ID_SERNO_LEN,       /* page len */
2025        };
2026
2027        memcpy(rbuf, hdr, sizeof(hdr));
2028        ata_id_string(args->id, (unsigned char *) &rbuf[4],
2029                      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2030        return 0;
2031}
2032
2033/**
2034 *      ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2035 *      @args: device IDENTIFY data / SCSI command of interest.
2036 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2037 *
2038 *      Yields two logical unit device identification designators:
2039 *       - vendor specific ASCII containing the ATA serial number
2040 *       - SAT defined "t10 vendor id based" containing ASCII vendor
2041 *         name ("ATA     "), model and serial numbers.
2042 *
2043 *      LOCKING:
2044 *      spin_lock_irqsave(host lock)
2045 */
2046static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2047{
2048        const int sat_model_serial_desc_len = 68;
2049        int num;
2050
2051        rbuf[1] = 0x83;                 /* this page code */
2052        num = 4;
2053
2054        /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2055        rbuf[num + 0] = 2;
2056        rbuf[num + 3] = ATA_ID_SERNO_LEN;
2057        num += 4;
2058        ata_id_string(args->id, (unsigned char *) rbuf + num,
2059                      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2060        num += ATA_ID_SERNO_LEN;
2061
2062        /* SAT defined lu model and serial numbers descriptor */
2063        /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2064        rbuf[num + 0] = 2;
2065        rbuf[num + 1] = 1;
2066        rbuf[num + 3] = sat_model_serial_desc_len;
2067        num += 4;
2068        memcpy(rbuf + num, "ATA     ", 8);
2069        num += 8;
2070        ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2071                      ATA_ID_PROD_LEN);
2072        num += ATA_ID_PROD_LEN;
2073        ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2074                      ATA_ID_SERNO_LEN);
2075        num += ATA_ID_SERNO_LEN;
2076
2077        if (ata_id_has_wwn(args->id)) {
2078                /* SAT defined lu world wide name */
2079                /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2080                rbuf[num + 0] = 1;
2081                rbuf[num + 1] = 3;
2082                rbuf[num + 3] = ATA_ID_WWN_LEN;
2083                num += 4;
2084                ata_id_string(args->id, (unsigned char *) rbuf + num,
2085                              ATA_ID_WWN, ATA_ID_WWN_LEN);
2086                num += ATA_ID_WWN_LEN;
2087        }
2088        rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
2089        return 0;
2090}
2091
2092/**
2093 *      ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2094 *      @args: device IDENTIFY data / SCSI command of interest.
2095 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2096 *
2097 *      Yields SAT-specified ATA VPD page.
2098 *
2099 *      LOCKING:
2100 *      spin_lock_irqsave(host lock)
2101 */
2102static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2103{
2104        struct ata_taskfile tf;
2105
2106        memset(&tf, 0, sizeof(tf));
2107
2108        rbuf[1] = 0x89;                 /* our page code */
2109        rbuf[2] = (0x238 >> 8);         /* page size fixed at 238h */
2110        rbuf[3] = (0x238 & 0xff);
2111
2112        memcpy(&rbuf[8], "linux   ", 8);
2113        memcpy(&rbuf[16], "libata          ", 16);
2114        memcpy(&rbuf[32], DRV_VERSION, 4);
2115        ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2116
2117        /* we don't store the ATA device signature, so we fake it */
2118
2119        tf.command = ATA_DRDY;          /* really, this is Status reg */
2120        tf.lbal = 0x1;
2121        tf.nsect = 0x1;
2122
2123        ata_tf_to_fis(&tf, 0, 1, &rbuf[36]);    /* TODO: PMP? */
2124        rbuf[36] = 0x34;                /* force D2H Reg FIS (34h) */
2125
2126        rbuf[56] = ATA_CMD_ID_ATA;
2127
2128        memcpy(&rbuf[60], &args->id[0], 512);
2129        return 0;
2130}
2131
2132static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2133{
2134        u16 min_io_sectors;
2135
2136        rbuf[1] = 0xb0;
2137        rbuf[3] = 0x3c;         /* required VPD size with unmap support */
2138
2139        /*
2140         * Optimal transfer length granularity.
2141         *
2142         * This is always one physical block, but for disks with a smaller
2143         * logical than physical sector size we need to figure out what the
2144         * latter is.
2145         */
2146        min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2147        put_unaligned_be16(min_io_sectors, &rbuf[6]);
2148
2149        /*
2150         * Optimal unmap granularity.
2151         *
2152         * The ATA spec doesn't even know about a granularity or alignment
2153         * for the TRIM command.  We can leave away most of the unmap related
2154         * VPD page entries, but we have specifify a granularity to signal
2155         * that we support some form of unmap - in thise case via WRITE SAME
2156         * with the unmap bit set.
2157         */
2158        if (ata_id_has_trim(args->id)) {
2159                put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2160                put_unaligned_be32(1, &rbuf[28]);
2161        }
2162
2163        return 0;
2164}
2165
2166static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2167{
2168        int form_factor = ata_id_form_factor(args->id);
2169        int media_rotation_rate = ata_id_rotation_rate(args->id);
2170
2171        rbuf[1] = 0xb1;
2172        rbuf[3] = 0x3c;
2173        rbuf[4] = media_rotation_rate >> 8;
2174        rbuf[5] = media_rotation_rate;
2175        rbuf[7] = form_factor;
2176
2177        return 0;
2178}
2179
2180static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2181{
2182        /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2183        rbuf[1] = 0xb2;
2184        rbuf[3] = 0x4;
2185        rbuf[5] = 1 << 6;       /* TPWS */
2186
2187        return 0;
2188}
2189
2190/**
2191 *      ata_scsiop_noop - Command handler that simply returns success.
2192 *      @args: device IDENTIFY data / SCSI command of interest.
2193 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2194 *
2195 *      No operation.  Simply returns success to caller, to indicate
2196 *      that the caller should successfully complete this SCSI command.
2197 *
2198 *      LOCKING:
2199 *      spin_lock_irqsave(host lock)
2200 */
2201static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2202{
2203        VPRINTK("ENTER\n");
2204        return 0;
2205}
2206
2207/**
2208 *      ata_msense_caching - Simulate MODE SENSE caching info page
2209 *      @id: device IDENTIFY data
2210 *      @buf: output buffer
2211 *
2212 *      Generate a caching info page, which conditionally indicates
2213 *      write caching to the SCSI layer, depending on device
2214 *      capabilities.
2215 *
2216 *      LOCKING:
2217 *      None.
2218 */
2219static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2220{
2221        memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2222        if (ata_id_wcache_enabled(id))
2223                buf[2] |= (1 << 2);     /* write cache enable */
2224        if (!ata_id_rahead_enabled(id))
2225                buf[12] |= (1 << 5);    /* disable read ahead */
2226        return sizeof(def_cache_mpage);
2227}
2228
2229/**
2230 *      ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2231 *      @buf: output buffer
2232 *
2233 *      Generate a generic MODE SENSE control mode page.
2234 *
2235 *      LOCKING:
2236 *      None.
2237 */
2238static unsigned int ata_msense_ctl_mode(u8 *buf)
2239{
2240        memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2241        return sizeof(def_control_mpage);
2242}
2243
2244/**
2245 *      ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2246 *      @buf: output buffer
2247 *
2248 *      Generate a generic MODE SENSE r/w error recovery page.
2249 *
2250 *      LOCKING:
2251 *      None.
2252 */
2253static unsigned int ata_msense_rw_recovery(u8 *buf)
2254{
2255        memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2256        return sizeof(def_rw_recovery_mpage);
2257}
2258
2259/*
2260 * We can turn this into a real blacklist if it's needed, for now just
2261 * blacklist any Maxtor BANC1G10 revision firmware
2262 */
2263static int ata_dev_supports_fua(u16 *id)
2264{
2265        unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2266
2267        if (!libata_fua)
2268                return 0;
2269        if (!ata_id_has_fua(id))
2270                return 0;
2271
2272        ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2273        ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2274
2275        if (strcmp(model, "Maxtor"))
2276                return 1;
2277        if (strcmp(fw, "BANC1G10"))
2278                return 1;
2279
2280        return 0; /* blacklisted */
2281}
2282
2283/**
2284 *      ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2285 *      @args: device IDENTIFY data / SCSI command of interest.
2286 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2287 *
2288 *      Simulate MODE SENSE commands. Assume this is invoked for direct
2289 *      access devices (e.g. disks) only. There should be no block
2290 *      descriptor for other device types.
2291 *
2292 *      LOCKING:
2293 *      spin_lock_irqsave(host lock)
2294 */
2295static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2296{
2297        struct ata_device *dev = args->dev;
2298        u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2299        const u8 sat_blk_desc[] = {
2300                0, 0, 0, 0,     /* number of blocks: sat unspecified */
2301                0,
2302                0, 0x2, 0x0     /* block length: 512 bytes */
2303        };
2304        u8 pg, spg;
2305        unsigned int ebd, page_control, six_byte;
2306        u8 dpofua;
2307
2308        VPRINTK("ENTER\n");
2309
2310        six_byte = (scsicmd[0] == MODE_SENSE);
2311        ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
2312        /*
2313         * LLBA bit in msense(10) ignored (compliant)
2314         */
2315
2316        page_control = scsicmd[2] >> 6;
2317        switch (page_control) {
2318        case 0: /* current */
2319                break;  /* supported */
2320        case 3: /* saved */
2321                goto saving_not_supp;
2322        case 1: /* changeable */
2323        case 2: /* defaults */
2324        default:
2325                goto invalid_fld;
2326        }
2327
2328        if (six_byte)
2329                p += 4 + (ebd ? 8 : 0);
2330        else
2331                p += 8 + (ebd ? 8 : 0);
2332
2333        pg = scsicmd[2] & 0x3f;
2334        spg = scsicmd[3];
2335        /*
2336         * No mode subpages supported (yet) but asking for _all_
2337         * subpages may be valid
2338         */
2339        if (spg && (spg != ALL_SUB_MPAGES))
2340                goto invalid_fld;
2341
2342        switch(pg) {
2343        case RW_RECOVERY_MPAGE:
2344                p += ata_msense_rw_recovery(p);
2345                break;
2346
2347        case CACHE_MPAGE:
2348                p += ata_msense_caching(args->id, p);
2349                break;
2350
2351        case CONTROL_MPAGE:
2352                p += ata_msense_ctl_mode(p);
2353                break;
2354
2355        case ALL_MPAGES:
2356                p += ata_msense_rw_recovery(p);
2357                p += ata_msense_caching(args->id, p);
2358                p += ata_msense_ctl_mode(p);
2359                break;
2360
2361        default:                /* invalid page code */
2362                goto invalid_fld;
2363        }
2364
2365        dpofua = 0;
2366        if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2367            (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2368                dpofua = 1 << 4;
2369
2370        if (six_byte) {
2371                rbuf[0] = p - rbuf - 1;
2372                rbuf[2] |= dpofua;
2373                if (ebd) {
2374                        rbuf[3] = sizeof(sat_blk_desc);
2375                        memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2376                }
2377        } else {
2378                unsigned int output_len = p - rbuf - 2;
2379
2380                rbuf[0] = output_len >> 8;
2381                rbuf[1] = output_len;
2382                rbuf[3] |= dpofua;
2383                if (ebd) {
2384                        rbuf[7] = sizeof(sat_blk_desc);
2385                        memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2386                }
2387        }
2388        return 0;
2389
2390invalid_fld:
2391        ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2392        /* "Invalid field in cbd" */
2393        return 1;
2394
2395saving_not_supp:
2396        ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2397         /* "Saving parameters not supported" */
2398        return 1;
2399}
2400
2401/**
2402 *      ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2403 *      @args: device IDENTIFY data / SCSI command of interest.
2404 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2405 *
2406 *      Simulate READ CAPACITY commands.
2407 *
2408 *      LOCKING:
2409 *      None.
2410 */
2411static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2412{
2413        struct ata_device *dev = args->dev;
2414        u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2415        u32 sector_size; /* physical sector size in bytes */
2416        u8 log2_per_phys;
2417        u16 lowest_aligned;
2418
2419        sector_size = ata_id_logical_sector_size(dev->id);
2420        log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2421        lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2422
2423        VPRINTK("ENTER\n");
2424
2425        if (args->cmd->cmnd[0] == READ_CAPACITY) {
2426                if (last_lba >= 0xffffffffULL)
2427                        last_lba = 0xffffffff;
2428
2429                /* sector count, 32-bit */
2430                rbuf[0] = last_lba >> (8 * 3);
2431                rbuf[1] = last_lba >> (8 * 2);
2432                rbuf[2] = last_lba >> (8 * 1);
2433                rbuf[3] = last_lba;
2434
2435                /* sector size */
2436                rbuf[4] = sector_size >> (8 * 3);
2437                rbuf[5] = sector_size >> (8 * 2);
2438                rbuf[6] = sector_size >> (8 * 1);
2439                rbuf[7] = sector_size;
2440        } else {
2441                /* sector count, 64-bit */
2442                rbuf[0] = last_lba >> (8 * 7);
2443                rbuf[1] = last_lba >> (8 * 6);
2444                rbuf[2] = last_lba >> (8 * 5);
2445                rbuf[3] = last_lba >> (8 * 4);
2446                rbuf[4] = last_lba >> (8 * 3);
2447                rbuf[5] = last_lba >> (8 * 2);
2448                rbuf[6] = last_lba >> (8 * 1);
2449                rbuf[7] = last_lba;
2450
2451                /* sector size */
2452                rbuf[ 8] = sector_size >> (8 * 3);
2453                rbuf[ 9] = sector_size >> (8 * 2);
2454                rbuf[10] = sector_size >> (8 * 1);
2455                rbuf[11] = sector_size;
2456
2457                rbuf[12] = 0;
2458                rbuf[13] = log2_per_phys;
2459                rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2460                rbuf[15] = lowest_aligned;
2461
2462                if (ata_id_has_trim(args->id)) {
2463                        rbuf[14] |= 0x80; /* TPE */
2464
2465                        if (ata_id_has_zero_after_trim(args->id))
2466                                rbuf[14] |= 0x40; /* TPRZ */
2467                }
2468        }
2469
2470        return 0;
2471}
2472
2473/**
2474 *      ata_scsiop_report_luns - Simulate REPORT LUNS command
2475 *      @args: device IDENTIFY data / SCSI command of interest.
2476 *      @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2477 *
2478 *      Simulate REPORT LUNS command.
2479 *
2480 *      LOCKING:
2481 *      spin_lock_irqsave(host lock)
2482 */
2483static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2484{
2485        VPRINTK("ENTER\n");
2486        rbuf[3] = 8;    /* just one lun, LUN 0, size 8 bytes */
2487
2488        return 0;
2489}
2490
2491static void atapi_sense_complete(struct ata_queued_cmd *qc)
2492{
2493        if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2494                /* FIXME: not quite right; we don't want the
2495                 * translation of taskfile registers into
2496                 * a sense descriptors, since that's only
2497                 * correct for ATA, not ATAPI
2498                 */
2499                ata_gen_passthru_sense(qc);
2500        }
2501
2502        qc->scsidone(qc->scsicmd);
2503        ata_qc_free(qc);
2504}
2505
2506/* is it pointless to prefer PIO for "safety reasons"? */
2507static inline int ata_pio_use_silly(struct ata_port *ap)
2508{
2509        return (ap->flags & ATA_FLAG_PIO_DMA);
2510}
2511
2512static void atapi_request_sense(struct ata_queued_cmd *qc)
2513{
2514        struct ata_port *ap = qc->ap;
2515        struct scsi_cmnd *cmd = qc->scsicmd;
2516
2517        DPRINTK("ATAPI request sense\n");
2518
2519        /* FIXME: is this needed? */
2520        memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2521
2522#ifdef CONFIG_ATA_SFF
2523        if (ap->ops->sff_tf_read)
2524                ap->ops->sff_tf_read(ap, &qc->tf);
2525#endif
2526
2527        /* fill these in, for the case where they are -not- overwritten */
2528        cmd->sense_buffer[0] = 0x70;
2529        cmd->sense_buffer[2] = qc->tf.feature >> 4;
2530
2531        ata_qc_reinit(qc);
2532
2533        /* setup sg table and init transfer direction */
2534        sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2535        ata_sg_init(qc, &qc->sgent, 1);
2536        qc->dma_dir = DMA_FROM_DEVICE;
2537
2538        memset(&qc->cdb, 0, qc->dev->cdb_len);
2539        qc->cdb[0] = REQUEST_SENSE;
2540        qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2541
2542        qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2543        qc->tf.command = ATA_CMD_PACKET;
2544
2545        if (ata_pio_use_silly(ap)) {
2546                qc->tf.protocol = ATAPI_PROT_DMA;
2547                qc->tf.feature |= ATAPI_PKT_DMA;
2548        } else {
2549                qc->tf.protocol = ATAPI_PROT_PIO;
2550                qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2551                qc->tf.lbah = 0;
2552        }
2553        qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2554
2555        qc->complete_fn = atapi_sense_complete;
2556
2557        ata_qc_issue(qc);
2558
2559        DPRINTK("EXIT\n");
2560}
2561
2562static void atapi_qc_complete(struct ata_queued_cmd *qc)
2563{
2564        struct scsi_cmnd *cmd = qc->scsicmd;
2565        unsigned int err_mask = qc->err_mask;
2566
2567        VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2568
2569        /* handle completion from new EH */
2570        if (unlikely(qc->ap->ops->error_handler &&
2571                     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2572
2573                if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2574                        /* FIXME: not quite right; we don't want the
2575                         * translation of taskfile registers into a
2576                         * sense descriptors, since that's only
2577                         * correct for ATA, not ATAPI
2578                         */
2579                        ata_gen_passthru_sense(qc);
2580                }
2581
2582                /* SCSI EH automatically locks door if sdev->locked is
2583                 * set.  Sometimes door lock request continues to
2584                 * fail, for example, when no media is present.  This
2585                 * creates a loop - SCSI EH issues door lock which
2586                 * fails and gets invoked again to acquire sense data
2587                 * for the failed command.
2588                 *
2589                 * If door lock fails, always clear sdev->locked to
2590                 * avoid this infinite loop.
2591                 *
2592                 * This may happen before SCSI scan is complete.  Make
2593                 * sure qc->dev->sdev isn't NULL before dereferencing.
2594                 */
2595                if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2596                        qc->dev->sdev->locked = 0;
2597
2598                qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2599                qc->scsidone(cmd);
2600                ata_qc_free(qc);
2601                return;
2602        }
2603
2604        /* successful completion or old EH failure path */
2605        if (unlikely(err_mask & AC_ERR_DEV)) {
2606                cmd->result = SAM_STAT_CHECK_CONDITION;
2607                atapi_request_sense(qc);
2608                return;
2609        } else if (unlikely(err_mask)) {
2610                /* FIXME: not quite right; we don't want the
2611                 * translation of taskfile registers into
2612                 * a sense descriptors, since that's only
2613                 * correct for ATA, not ATAPI
2614                 */
2615                ata_gen_passthru_sense(qc);
2616        } else {
2617                u8 *scsicmd = cmd->cmnd;
2618
2619                if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2620                        unsigned long flags;
2621                        u8 *buf;
2622
2623                        buf = ata_scsi_rbuf_get(cmd, true, &flags);
2624
2625        /* ATAPI devices typically report zero for their SCSI version,
2626         * and sometimes deviate from the spec WRT response data
2627         * format.  If SCSI version is reported as zero like normal,
2628         * then we make the following fixups:  1) Fake MMC-5 version,
2629         * to indicate to the Linux scsi midlayer this is a modern
2630         * device.  2) Ensure response data format / ATAPI information
2631         * are always correct.
2632         */
2633                        if (buf[2] == 0) {
2634                                buf[2] = 0x5;
2635                                buf[3] = 0x32;
2636                        }
2637
2638                        ata_scsi_rbuf_put(cmd, true, &flags);
2639                }
2640
2641                cmd->result = SAM_STAT_GOOD;
2642        }
2643
2644        qc->scsidone(cmd);
2645        ata_qc_free(qc);
2646}
2647/**
2648 *      atapi_xlat - Initialize PACKET taskfile
2649 *      @qc: command structure to be initialized
2650 *
2651 *      LOCKING:
2652 *      spin_lock_irqsave(host lock)
2653 *
2654 *      RETURNS:
2655 *      Zero on success, non-zero on failure.
2656 */
2657static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2658{
2659        struct scsi_cmnd *scmd = qc->scsicmd;
2660        struct ata_device *dev = qc->dev;
2661        int nodata = (scmd->sc_data_direction == DMA_NONE);
2662        int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2663        unsigned int nbytes;
2664
2665        memset(qc->cdb, 0, dev->cdb_len);
2666        memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2667
2668        qc->complete_fn = atapi_qc_complete;
2669
2670        qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2671        if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2672                qc->tf.flags |= ATA_TFLAG_WRITE;
2673                DPRINTK("direction: write\n");
2674        }
2675
2676        qc->tf.command = ATA_CMD_PACKET;
2677        ata_qc_set_pc_nbytes(qc);
2678
2679        /* check whether ATAPI DMA is safe */
2680        if (!nodata && !using_pio && atapi_check_dma(qc))
2681                using_pio = 1;
2682
2683        /* Some controller variants snoop this value for Packet
2684         * transfers to do state machine and FIFO management.  Thus we
2685         * want to set it properly, and for DMA where it is
2686         * effectively meaningless.
2687         */
2688        nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2689
2690        /* Most ATAPI devices which honor transfer chunk size don't
2691         * behave according to the spec when odd chunk size which
2692         * matches the transfer length is specified.  If the number of
2693         * bytes to transfer is 2n+1.  According to the spec, what
2694         * should happen is to indicate that 2n+1 is going to be
2695         * transferred and transfer 2n+2 bytes where the last byte is
2696         * padding.
2697         *
2698         * In practice, this doesn't happen.  ATAPI devices first
2699         * indicate and transfer 2n bytes and then indicate and
2700         * transfer 2 bytes where the last byte is padding.
2701         *
2702         * This inconsistency confuses several controllers which
2703         * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2704         * These controllers use actual number of transferred bytes to
2705         * update DMA poitner and transfer of 4n+2 bytes make those
2706         * controller push DMA pointer by 4n+4 bytes because SATA data
2707         * FISes are aligned to 4 bytes.  This causes data corruption
2708         * and buffer overrun.
2709         *
2710         * Always setting nbytes to even number solves this problem
2711         * because then ATAPI devices don't have to split data at 2n
2712         * boundaries.
2713         */
2714        if (nbytes & 0x1)
2715                nbytes++;
2716
2717        qc->tf.lbam = (nbytes & 0xFF);
2718        qc->tf.lbah = (nbytes >> 8);
2719
2720        if (nodata)
2721                qc->tf.protocol = ATAPI_PROT_NODATA;
2722        else if (using_pio)
2723                qc->tf.protocol = ATAPI_PROT_PIO;
2724        else {
2725                /* DMA data xfer */
2726                qc->tf.protocol = ATAPI_PROT_DMA;
2727                qc->tf.feature |= ATAPI_PKT_DMA;
2728
2729                if ((dev->flags & ATA_DFLAG_DMADIR) &&
2730                    (scmd->sc_data_direction != DMA_TO_DEVICE))
2731                        /* some SATA bridges need us to indicate data xfer direction */
2732                        qc->tf.feature |= ATAPI_DMADIR;
2733        }
2734
2735
2736        /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2737           as ATAPI tape drives don't get this right otherwise */
2738        return 0;
2739}
2740
2741static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2742{
2743        if (!sata_pmp_attached(ap)) {
2744                if (likely(devno < ata_link_max_devices(&ap->link)))
2745                        return &ap->link.device[devno];
2746        } else {
2747                if (likely(devno < ap->nr_pmp_links))
2748                        return &ap->pmp_link[devno].device[0];
2749        }
2750
2751        return NULL;
2752}
2753
2754static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2755                                              const struct scsi_device *scsidev)
2756{
2757        int devno;
2758
2759        /* skip commands not addressed to targets we simulate */
2760        if (!sata_pmp_attached(ap)) {
2761                if (unlikely(scsidev->channel || scsidev->lun))
2762                        return NULL;
2763                devno = scsidev->id;
2764        } else {
2765                if (unlikely(scsidev->id || scsidev->lun))
2766                        return NULL;
2767                devno = scsidev->channel;
2768        }
2769
2770        return ata_find_dev(ap, devno);
2771}
2772
2773/**
2774 *      ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2775 *      @ap: ATA port to which the device is attached
2776 *      @scsidev: SCSI device from which we derive the ATA device
2777 *
2778 *      Given various information provided in struct scsi_cmnd,
2779 *      map that onto an ATA bus, and using that mapping
2780 *      determine which ata_device is associated with the
2781 *      SCSI command to be sent.
2782 *
2783 *      LOCKING:
2784 *      spin_lock_irqsave(host lock)
2785 *
2786 *      RETURNS:
2787 *      Associated ATA device, or %NULL if not found.
2788 */
2789static struct ata_device *
2790ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2791{
2792        struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2793
2794        if (unlikely(!dev || !ata_dev_enabled(dev)))
2795                return NULL;
2796
2797        return dev;
2798}
2799
2800/*
2801 *      ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2802 *      @byte1: Byte 1 from pass-thru CDB.
2803 *
2804 *      RETURNS:
2805 *      ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2806 */
2807static u8
2808ata_scsi_map_proto(u8 byte1)
2809{
2810        switch((byte1 & 0x1e) >> 1) {
2811        case 3:         /* Non-data */
2812                return ATA_PROT_NODATA;
2813
2814        case 6:         /* DMA */
2815        case 10:        /* UDMA Data-in */
2816        case 11:        /* UDMA Data-Out */
2817                return ATA_PROT_DMA;
2818
2819        case 4:         /* PIO Data-in */
2820        case 5:         /* PIO Data-out */
2821                return ATA_PROT_PIO;
2822
2823        case 0:         /* Hard Reset */
2824        case 1:         /* SRST */
2825        case 8:         /* Device Diagnostic */
2826        case 9:         /* Device Reset */
2827        case 7:         /* DMA Queued */
2828        case 12:        /* FPDMA */
2829        case 15:        /* Return Response Info */
2830        default:        /* Reserved */
2831                break;
2832        }
2833
2834        return ATA_PROT_UNKNOWN;
2835}
2836
2837/**
2838 *      ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2839 *      @qc: command structure to be initialized
2840 *
2841 *      Handles either 12 or 16-byte versions of the CDB.
2842 *
2843 *      RETURNS:
2844 *      Zero on success, non-zero on failure.
2845 */
2846static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2847{
2848        struct ata_taskfile *tf = &(qc->tf);
2849        struct scsi_cmnd *scmd = qc->scsicmd;
2850        struct ata_device *dev = qc->dev;
2851        const u8 *cdb = scmd->cmnd;
2852
2853        if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2854                goto invalid_fld;
2855
2856        /*
2857         * 12 and 16 byte CDBs use different offsets to
2858         * provide the various register values.
2859         */
2860        if (cdb[0] == ATA_16) {
2861                /*
2862                 * 16-byte CDB - may contain extended commands.
2863                 *
2864                 * If that is the case, copy the upper byte register values.
2865                 */
2866                if (cdb[1] & 0x01) {
2867                        tf->hob_feature = cdb[3];
2868                        tf->hob_nsect = cdb[5];
2869                        tf->hob_lbal = cdb[7];
2870                        tf->hob_lbam = cdb[9];
2871                        tf->hob_lbah = cdb[11];
2872                        tf->flags |= ATA_TFLAG_LBA48;
2873                } else
2874                        tf->flags &= ~ATA_TFLAG_LBA48;
2875
2876                /*
2877                 * Always copy low byte, device and command registers.
2878                 */
2879                tf->feature = cdb[4];
2880                tf->nsect = cdb[6];
2881                tf->lbal = cdb[8];
2882                tf->lbam = cdb[10];
2883                tf->lbah = cdb[12];
2884                tf->device = cdb[13];
2885                tf->command = cdb[14];
2886        } else {
2887                /*
2888                 * 12-byte CDB - incapable of extended commands.
2889                 */
2890                tf->flags &= ~ATA_TFLAG_LBA48;
2891
2892                tf->feature = cdb[3];
2893                tf->nsect = cdb[4];
2894                tf->lbal = cdb[5];
2895                tf->lbam = cdb[6];
2896                tf->lbah = cdb[7];
2897                tf->device = cdb[8];
2898                tf->command = cdb[9];
2899        }
2900
2901        /* enforce correct master/slave bit */
2902        tf->device = dev->devno ?
2903                tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2904
2905        switch (tf->command) {
2906        /* READ/WRITE LONG use a non-standard sect_size */
2907        case ATA_CMD_READ_LONG:
2908        case ATA_CMD_READ_LONG_ONCE:
2909        case ATA_CMD_WRITE_LONG:
2910        case ATA_CMD_WRITE_LONG_ONCE:
2911                if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2912                        goto invalid_fld;
2913                qc->sect_size = scsi_bufflen(scmd);
2914                break;
2915
2916        /* commands using reported Logical Block size (e.g. 512 or 4K) */
2917        case ATA_CMD_CFA_WRITE_NE:
2918        case ATA_CMD_CFA_TRANS_SECT:
2919        case ATA_CMD_CFA_WRITE_MULT_NE:
2920        /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2921        case ATA_CMD_READ:
2922        case ATA_CMD_READ_EXT:
2923        case ATA_CMD_READ_QUEUED:
2924        /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2925        case ATA_CMD_FPDMA_READ:
2926        case ATA_CMD_READ_MULTI:
2927        case ATA_CMD_READ_MULTI_EXT:
2928        case ATA_CMD_PIO_READ:
2929        case ATA_CMD_PIO_READ_EXT:
2930        case ATA_CMD_READ_STREAM_DMA_EXT:
2931        case ATA_CMD_READ_STREAM_EXT:
2932        case ATA_CMD_VERIFY:
2933        case ATA_CMD_VERIFY_EXT:
2934        case ATA_CMD_WRITE:
2935        case ATA_CMD_WRITE_EXT:
2936        case ATA_CMD_WRITE_FUA_EXT:
2937        case ATA_CMD_WRITE_QUEUED:
2938        case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2939        case ATA_CMD_FPDMA_WRITE:
2940        case ATA_CMD_WRITE_MULTI:
2941        case ATA_CMD_WRITE_MULTI_EXT:
2942        case ATA_CMD_WRITE_MULTI_FUA_EXT:
2943        case ATA_CMD_PIO_WRITE:
2944        case ATA_CMD_PIO_WRITE_EXT:
2945        case ATA_CMD_WRITE_STREAM_DMA_EXT:
2946        case ATA_CMD_WRITE_STREAM_EXT:
2947                qc->sect_size = scmd->device->sector_size;
2948                break;
2949
2950        /* Everything else uses 512 byte "sectors" */
2951        default:
2952                qc->sect_size = ATA_SECT_SIZE;
2953        }
2954
2955        /*
2956         * Set flags so that all registers will be written, pass on
2957         * write indication (used for PIO/DMA setup), result TF is
2958         * copied back and we don't whine too much about its failure.
2959         */
2960        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2961        if (scmd->sc_data_direction == DMA_TO_DEVICE)
2962                tf->flags |= ATA_TFLAG_WRITE;
2963
2964        qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2965
2966        /*
2967         * Set transfer length.
2968         *
2969         * TODO: find out if we need to do more here to
2970         *       cover scatter/gather case.
2971         */
2972        ata_qc_set_pc_nbytes(qc);
2973
2974        /* We may not issue DMA commands if no DMA mode is set */
2975        if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2976                goto invalid_fld;
2977
2978        /* sanity check for pio multi commands */
2979        if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2980                goto invalid_fld;
2981
2982        if (is_multi_taskfile(tf)) {
2983                unsigned int multi_count = 1 << (cdb[1] >> 5);
2984
2985                /* compare the passed through multi_count
2986                 * with the cached multi_count of libata
2987                 */
2988                if (multi_count != dev->multi_count)
2989                        ata_dev_warn(dev, "invalid multi_count %u ignored\n",
2990                                     multi_count);
2991        }
2992
2993        /*
2994         * Filter SET_FEATURES - XFER MODE command -- otherwise,
2995         * SET_FEATURES - XFER MODE must be preceded/succeeded
2996         * by an update to hardware-specific registers for each
2997         * controller (i.e. the reason for ->set_piomode(),
2998         * ->set_dmamode(), and ->post_set_mode() hooks).
2999         */
3000        if (tf->command == ATA_CMD_SET_FEATURES &&
3001            tf->feature == SETFEATURES_XFER)
3002                goto invalid_fld;
3003
3004        /*
3005         * Filter TPM commands by default. These provide an
3006         * essentially uncontrolled encrypted "back door" between
3007         * applications and the disk. Set libata.allow_tpm=1 if you
3008         * have a real reason for wanting to use them. This ensures
3009         * that installed software cannot easily mess stuff up without
3010         * user intent. DVR type users will probably ship with this enabled
3011         * for movie content management.
3012         *
3013         * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3014         * for this and should do in future but that it is not sufficient as
3015         * DCS is an optional feature set. Thus we also do the software filter
3016         * so that we comply with the TC consortium stated goal that the user
3017         * can turn off TC features of their system.
3018         */
3019        if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3020                goto invalid_fld;
3021
3022        return 0;
3023
3024 invalid_fld:
3025        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3026        /* "Invalid field in cdb" */
3027        return 1;
3028}
3029
3030static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3031{
3032        struct ata_taskfile *tf = &qc->tf;
3033        struct scsi_cmnd *scmd = qc->scsicmd;
3034        struct ata_device *dev = qc->dev;
3035        const u8 *cdb = scmd->cmnd;
3036        u64 block;
3037        u32 n_block;
3038        u32 size;
3039        void *buf;
3040
3041        /* we may not issue DMA commands if no DMA mode is set */
3042        if (unlikely(!dev->dma_mode))
3043                goto invalid_fld;
3044
3045        if (unlikely(scmd->cmd_len < 16))
3046                goto invalid_fld;
3047        scsi_16_lba_len(cdb, &block, &n_block);
3048
3049        /* for now we only support WRITE SAME with the unmap bit set */
3050        if (unlikely(!(cdb[1] & 0x8)))
3051                goto invalid_fld;
3052
3053        /*
3054         * WRITE SAME always has a sector sized buffer as payload, this
3055         * should never be a multiple entry S/G list.
3056         */
3057        if (!scsi_sg_count(scmd))
3058                goto invalid_fld;
3059
3060        buf = page_address(sg_page(scsi_sglist(scmd)));
3061        size = ata_set_lba_range_entries(buf, 512, block, n_block);
3062
3063        tf->protocol = ATA_PROT_DMA;
3064        tf->hob_feature = 0;
3065        tf->feature = ATA_DSM_TRIM;
3066        tf->hob_nsect = (size / 512) >> 8;
3067        tf->nsect = size / 512;
3068        tf->command = ATA_CMD_DSM;
3069        tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3070                     ATA_TFLAG_WRITE;
3071
3072        ata_qc_set_pc_nbytes(qc);
3073
3074        return 0;
3075
3076 invalid_fld:
3077        ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3078        /* "Invalid field in cdb" */
3079        return 1;
3080}
3081
3082/**
3083 *      ata_get_xlat_func - check if SCSI to ATA translation is possible
3084 *      @dev: ATA device
3085 *      @cmd: SCSI command opcode to consider
3086 *
3087 *      Look up the SCSI command given, and determine whether the
3088 *      SCSI command is to be translated or simulated.
3089 *
3090 *      RETURNS:
3091 *      Pointer to translation function if possible, %NULL if not.
3092 */
3093
3094static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3095{
3096        switch (cmd) {
3097        case READ_6:
3098        case READ_10:
3099        case READ_16:
3100
3101        case WRITE_6:
3102        case WRITE_10:
3103        case WRITE_16:
3104                return ata_scsi_rw_xlat;
3105
3106        case WRITE_SAME_16:
3107                return ata_scsi_write_same_xlat;
3108
3109        case SYNCHRONIZE_CACHE:
3110                if (ata_try_flush_cache(dev))
3111                        return ata_scsi_flush_xlat;
3112                break;
3113
3114        case VERIFY:
3115        case VERIFY_16:
3116                return ata_scsi_verify_xlat;
3117
3118        case ATA_12:
3119        case ATA_16:
3120                return ata_scsi_pass_thru;
3121
3122        case START_STOP:
3123                return ata_scsi_start_stop_xlat;
3124        }
3125
3126        return NULL;
3127}
3128
3129/**
3130 *      ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3131 *      @ap: ATA port to which the command was being sent
3132 *      @cmd: SCSI command to dump
3133 *
3134 *      Prints the contents of a SCSI command via printk().
3135 */
3136
3137static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3138                                     struct scsi_cmnd *cmd)
3139{
3140#ifdef ATA_DEBUG
3141        struct scsi_device *scsidev = cmd->device;
3142        u8 *scsicmd = cmd->cmnd;
3143
3144        DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3145                ap->print_id,
3146                scsidev->channel, scsidev->id, scsidev->lun,
3147                scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3148                scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3149                scsicmd[8]);
3150#endif
3151}
3152
3153static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3154                                      struct ata_device *dev)
3155{
3156        u8 scsi_op = scmd->cmnd[0];
3157        ata_xlat_func_t xlat_func;
3158        int rc = 0;
3159
3160        if (dev->class == ATA_DEV_ATA) {
3161                if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3162                        goto bad_cdb_len;
3163
3164                xlat_func = ata_get_xlat_func(dev, scsi_op);
3165        } else {
3166                if (unlikely(!scmd->cmd_len))
3167                        goto bad_cdb_len;
3168
3169                xlat_func = NULL;
3170                if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3171                        /* relay SCSI command to ATAPI device */
3172                        int len = COMMAND_SIZE(scsi_op);
3173                        if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3174                                goto bad_cdb_len;
3175
3176                        xlat_func = atapi_xlat;
3177                } else {
3178                        /* ATA_16 passthru, treat as an ATA command */
3179                        if (unlikely(scmd->cmd_len > 16))
3180                                goto bad_cdb_len;
3181
3182                        xlat_func = ata_get_xlat_func(dev, scsi_op);
3183                }
3184        }
3185
3186        if (xlat_func)
3187                rc = ata_scsi_translate(dev, scmd, xlat_func);
3188        else
3189                ata_scsi_simulate(dev, scmd);
3190
3191        return rc;
3192
3193 bad_cdb_len:
3194        DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3195                scmd->cmd_len, scsi_op, dev->cdb_len);
3196        scmd->result = DID_ERROR << 16;
3197        scmd->scsi_done(scmd);
3198        return 0;
3199}
3200
3201/**
3202 *      ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3203 *      @shost: SCSI host of command to be sent
3204 *      @cmd: SCSI command to be sent
3205 *
3206 *      In some cases, this function translates SCSI commands into
3207 *      ATA taskfiles, and queues the taskfiles to be sent to
3208 *      hardware.  In other cases, this function simulates a
3209 *      SCSI device by evaluating and responding to certain
3210 *      SCSI commands.  This creates the overall effect of
3211 *      ATA and ATAPI devices appearing as SCSI devices.
3212 *
3213 *      LOCKING:
3214 *      ATA host lock
3215 *
3216 *      RETURNS:
3217 *      Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3218 *      0 otherwise.
3219 */
3220int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3221{
3222        struct ata_port *ap;
3223        struct ata_device *dev;
3224        struct scsi_device *scsidev = cmd->device;
3225        int rc = 0;
3226        unsigned long irq_flags;
3227
3228        ap = ata_shost_to_port(shost);
3229
3230        spin_lock_irqsave(ap->lock, irq_flags);
3231
3232        ata_scsi_dump_cdb(ap, cmd);
3233
3234        dev = ata_scsi_find_dev(ap, scsidev);
3235        if (likely(dev))
3236                rc = __ata_scsi_queuecmd(cmd, dev);
3237        else {
3238                cmd->result = (DID_BAD_TARGET << 16);
3239                cmd->scsi_done(cmd);
3240        }
3241
3242        spin_unlock_irqrestore(ap->lock, irq_flags);
3243
3244        return rc;
3245}
3246
3247/**
3248 *      ata_scsi_simulate - simulate SCSI command on ATA device
3249 *      @dev: the target device
3250 *      @cmd: SCSI command being sent to device.
3251 *
3252 *      Interprets and directly executes a select list of SCSI commands
3253 *      that can be handled internally.
3254 *
3255 *      LOCKING:
3256 *      spin_lock_irqsave(host lock)
3257 */
3258
3259void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3260{
3261        struct ata_scsi_args args;
3262        const u8 *scsicmd = cmd->cmnd;
3263        u8 tmp8;
3264
3265        args.dev = dev;
3266        args.id = dev->id;
3267        args.cmd = cmd;
3268        args.done = cmd->scsi_done;
3269
3270        switch(scsicmd[0]) {
3271        /* TODO: worth improving? */
3272        case FORMAT_UNIT:
3273                ata_scsi_invalid_field(cmd);
3274                break;
3275
3276        case INQUIRY:
3277                if (scsicmd[1] & 2)                /* is CmdDt set?  */
3278                        ata_scsi_invalid_field(cmd);
3279                else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
3280                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3281                else switch (scsicmd[2]) {
3282                case 0x00:
3283                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3284                        break;
3285                case 0x80:
3286                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3287                        break;
3288                case 0x83:
3289                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3290                        break;
3291                case 0x89:
3292                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3293                        break;
3294                case 0xb0:
3295                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3296                        break;
3297                case 0xb1:
3298                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3299                        break;
3300                case 0xb2:
3301                        ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3302                        break;
3303                default:
3304                        ata_scsi_invalid_field(cmd);
3305                        break;
3306                }
3307                break;
3308
3309        case MODE_SENSE:
3310        case MODE_SENSE_10:
3311                ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3312                break;
3313
3314        case MODE_SELECT:       /* unconditionally return */
3315        case MODE_SELECT_10:    /* bad-field-in-cdb */
3316                ata_scsi_invalid_field(cmd);
3317                break;
3318
3319        case READ_CAPACITY:
3320                ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3321                break;
3322
3323        case SERVICE_ACTION_IN:
3324                if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3325                        ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3326                else
3327                        ata_scsi_invalid_field(cmd);
3328                break;
3329
3330        case REPORT_LUNS:
3331                ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3332                break;
3333
3334        case REQUEST_SENSE:
3335                ata_scsi_set_sense(cmd, 0, 0, 0);
3336                cmd->result = (DRIVER_SENSE << 24);
3337                cmd->scsi_done(cmd);
3338                break;
3339
3340        /* if we reach this, then writeback caching is disabled,
3341         * turning this into a no-op.
3342         */
3343        case SYNCHRONIZE_CACHE:
3344                /* fall through */
3345
3346        /* no-op's, complete with success */
3347        case REZERO_UNIT:
3348        case SEEK_6:
3349        case SEEK_10:
3350        case TEST_UNIT_READY:
3351                ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3352                break;
3353
3354        case SEND_DIAGNOSTIC:
3355                tmp8 = scsicmd[1] & ~(1 << 3);
3356                if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3357                        ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3358                else
3359                        ata_scsi_invalid_field(cmd);
3360                break;
3361
3362        /* all other commands */
3363        default:
3364                ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3365                /* "Invalid command operation code" */
3366                cmd->scsi_done(cmd);
3367                break;
3368        }
3369}
3370
3371int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3372{
3373        int i, rc;
3374
3375        for (i = 0; i < host->n_ports; i++) {
3376                struct ata_port *ap = host->ports[i];
3377                struct Scsi_Host *shost;
3378
3379                rc = -ENOMEM;
3380                shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3381                if (!shost)
3382                        goto err_alloc;
3383
3384                shost->eh_noresume = 1;
3385                *(struct ata_port **)&shost->hostdata[0] = ap;
3386                ap->scsi_host = shost;
3387
3388                shost->transportt = ata_scsi_transport_template;
3389                shost->unique_id = ap->print_id;
3390                shost->max_id = 16;
3391                shost->max_lun = 1;
3392                shost->max_channel = 1;
3393                shost->max_cmd_len = 16;
3394
3395                /* Schedule policy is determined by ->qc_defer()
3396                 * callback and it needs to see every deferred qc.
3397                 * Set host_blocked to 1 to prevent SCSI midlayer from
3398                 * automatically deferring requests.
3399                 */
3400                shost->max_host_blocked = 1;
3401
3402                rc = scsi_add_host_with_dma(ap->scsi_host,
3403                                                &ap->tdev, ap->host->dev);
3404                if (rc)
3405                        goto err_add;
3406        }
3407
3408        return 0;
3409
3410 err_add:
3411        scsi_host_put(host->ports[i]->scsi_host);
3412 err_alloc:
3413        while (--i >= 0) {
3414                struct Scsi_Host *shost = host->ports[i]->scsi_host;
3415
3416                scsi_remove_host(shost);
3417                scsi_host_put(shost);
3418        }
3419        return rc;
3420}
3421
3422void ata_scsi_scan_host(struct ata_port *ap, int sync)
3423{
3424        int tries = 5;
3425        struct ata_device *last_failed_dev = NULL;
3426        struct ata_link *link;
3427        struct ata_device *dev;
3428
3429 repeat:
3430        ata_for_each_link(link, ap, EDGE) {
3431                ata_for_each_dev(dev, link, ENABLED) {
3432                        struct scsi_device *sdev;
3433                        int channel = 0, id = 0;
3434
3435                        if (dev->sdev)
3436                                continue;
3437
3438                        if (ata_is_host_link(link))
3439                                id = dev->devno;
3440                        else
3441                                channel = link->pmp;
3442
3443                        sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3444                                                 NULL);
3445                        if (!IS_ERR(sdev)) {
3446                                dev->sdev = sdev;
3447                                scsi_device_put(sdev);
3448                                ata_acpi_bind(dev);
3449                        } else {
3450                                dev->sdev = NULL;
3451                        }
3452                }
3453        }
3454
3455        /* If we scanned while EH was in progress or allocation
3456         * failure occurred, scan would have failed silently.  Check
3457         * whether all devices are attached.
3458         */
3459        ata_for_each_link(link, ap, EDGE) {
3460                ata_for_each_dev(dev, link, ENABLED) {
3461                        if (!dev->sdev)
3462                                goto exit_loop;
3463                }
3464        }
3465 exit_loop:
3466        if (!link)
3467                return;
3468
3469        /* we're missing some SCSI devices */
3470        if (sync) {
3471                /* If caller requested synchrnous scan && we've made
3472                 * any progress, sleep briefly and repeat.
3473                 */
3474                if (dev != last_failed_dev) {
3475                        msleep(100);
3476                        last_failed_dev = dev;
3477                        goto repeat;
3478                }
3479
3480                /* We might be failing to detect boot device, give it
3481                 * a few more chances.
3482                 */
3483                if (--tries) {
3484                        msleep(100);
3485                        goto repeat;
3486                }
3487
3488                ata_port_err(ap,
3489                             "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3490        }
3491
3492        queue_delayed_work(system_long_wq, &ap->hotplug_task,
3493                           round_jiffies_relative(HZ));
3494}
3495
3496/**
3497 *      ata_scsi_offline_dev - offline attached SCSI device
3498 *      @dev: ATA device to offline attached SCSI device for
3499 *
3500 *      This function is called from ata_eh_hotplug() and responsible
3501 *      for taking the SCSI device attached to @dev offline.  This
3502 *      function is called with host lock which protects dev->sdev
3503 *      against clearing.
3504 *
3505 *      LOCKING:
3506 *      spin_lock_irqsave(host lock)
3507 *
3508 *      RETURNS:
3509 *      1 if attached SCSI device exists, 0 otherwise.
3510 */
3511int ata_scsi_offline_dev(struct ata_device *dev)
3512{
3513        if (dev->sdev) {
3514                scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3515                return 1;
3516        }
3517        return 0;
3518}
3519
3520/**
3521 *      ata_scsi_remove_dev - remove attached SCSI device
3522 *      @dev: ATA device to remove attached SCSI device for
3523 *
3524 *      This function is called from ata_eh_scsi_hotplug() and
3525 *      responsible for removing the SCSI device attached to @dev.
3526 *
3527 *      LOCKING:
3528 *      Kernel thread context (may sleep).
3529 */
3530static void ata_scsi_remove_dev(struct ata_device *dev)
3531{
3532        struct ata_port *ap = dev->link->ap;
3533        struct scsi_device *sdev;
3534        unsigned long flags;
3535
3536        /* Alas, we need to grab scan_mutex to ensure SCSI device
3537         * state doesn't change underneath us and thus
3538         * scsi_device_get() always succeeds.  The mutex locking can
3539         * be removed if there is __scsi_device_get() interface which
3540         * increments reference counts regardless of device state.
3541         */
3542        mutex_lock(&ap->scsi_host->scan_mutex);
3543        spin_lock_irqsave(ap->lock, flags);
3544
3545        ata_acpi_unbind(dev);
3546
3547        /* clearing dev->sdev is protected by host lock */
3548        sdev = dev->sdev;
3549        dev->sdev = NULL;
3550
3551        if (sdev) {
3552                /* If user initiated unplug races with us, sdev can go
3553                 * away underneath us after the host lock and
3554                 * scan_mutex are released.  Hold onto it.
3555                 */
3556                if (scsi_device_get(sdev) == 0) {
3557                        /* The following ensures the attached sdev is
3558                         * offline on return from ata_scsi_offline_dev()
3559                         * regardless it wins or loses the race
3560                         * against this function.
3561                         */
3562                        scsi_device_set_state(sdev, SDEV_OFFLINE);
3563                } else {
3564                        WARN_ON(1);
3565                        sdev = NULL;
3566                }
3567        }
3568
3569        spin_unlock_irqrestore(ap->lock, flags);
3570        mutex_unlock(&ap->scsi_host->scan_mutex);
3571
3572        if (sdev) {
3573                ata_dev_info(dev, "detaching (SCSI %s)\n",
3574                             dev_name(&sdev->sdev_gendev));
3575
3576                scsi_remove_device(sdev);
3577                scsi_device_put(sdev);
3578        }
3579}
3580
3581static void ata_scsi_handle_link_detach(struct ata_link *link)
3582{
3583        struct ata_port *ap = link->ap;
3584        struct ata_device *dev;
3585
3586        ata_for_each_dev(dev, link, ALL) {
3587                unsigned long flags;
3588
3589                if (!(dev->flags & ATA_DFLAG_DETACHED))
3590                        continue;
3591
3592                spin_lock_irqsave(ap->lock, flags);
3593                dev->flags &= ~ATA_DFLAG_DETACHED;
3594                spin_unlock_irqrestore(ap->lock, flags);
3595
3596                ata_scsi_remove_dev(dev);
3597        }
3598}
3599
3600/**
3601 *      ata_scsi_media_change_notify - send media change event
3602 *      @dev: Pointer to the disk device with media change event
3603 *
3604 *      Tell the block layer to send a media change notification
3605 *      event.
3606 *
3607 *      LOCKING:
3608 *      spin_lock_irqsave(host lock)
3609 */
3610void ata_scsi_media_change_notify(struct ata_device *dev)
3611{
3612        if (dev->sdev)
3613                sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3614                                     GFP_ATOMIC);
3615}
3616
3617/**
3618 *      ata_scsi_hotplug - SCSI part of hotplug
3619 *      @work: Pointer to ATA port to perform SCSI hotplug on
3620 *
3621 *      Perform SCSI part of hotplug.  It's executed from a separate
3622 *      workqueue after EH completes.  This is necessary because SCSI
3623 *      hot plugging requires working EH and hot unplugging is
3624 *      synchronized with hot plugging with a mutex.
3625 *
3626 *      LOCKING:
3627 *      Kernel thread context (may sleep).
3628 */
3629void ata_scsi_hotplug(struct work_struct *work)
3630{
3631        struct ata_port *ap =
3632                container_of(work, struct ata_port, hotplug_task.work);
3633        int i;
3634
3635        if (ap->pflags & ATA_PFLAG_UNLOADING) {
3636                DPRINTK("ENTER/EXIT - unloading\n");
3637                return;
3638        }
3639
3640        DPRINTK("ENTER\n");
3641        mutex_lock(&ap->scsi_scan_mutex);
3642
3643        /* Unplug detached devices.  We cannot use link iterator here
3644         * because PMP links have to be scanned even if PMP is
3645         * currently not attached.  Iterate manually.
3646         */
3647        ata_scsi_handle_link_detach(&ap->link);
3648        if (ap->pmp_link)
3649                for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3650                        ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3651
3652        /* scan for new ones */
3653        ata_scsi_scan_host(ap, 0);
3654
3655        mutex_unlock(&ap->scsi_scan_mutex);
3656        DPRINTK("EXIT\n");
3657}
3658
3659/**
3660 *      ata_scsi_user_scan - indication for user-initiated bus scan
3661 *      @shost: SCSI host to scan
3662 *      @channel: Channel to scan
3663 *      @id: ID to scan
3664 *      @lun: LUN to scan
3665 *
3666 *      This function is called when user explicitly requests bus
3667 *      scan.  Set probe pending flag and invoke EH.
3668 *
3669 *      LOCKING:
3670 *      SCSI layer (we don't care)
3671 *
3672 *      RETURNS:
3673 *      Zero.
3674 */
3675int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3676                       unsigned int id, unsigned int lun)
3677{
3678        struct ata_port *ap = ata_shost_to_port(shost);
3679        unsigned long flags;
3680        int devno, rc = 0;
3681
3682        if (!ap->ops->error_handler)
3683                return -EOPNOTSUPP;
3684
3685        if (lun != SCAN_WILD_CARD && lun)
3686                return -EINVAL;
3687
3688        if (!sata_pmp_attached(ap)) {
3689                if (channel != SCAN_WILD_CARD && channel)
3690                        return -EINVAL;
3691                devno = id;
3692        } else {
3693                if (id != SCAN_WILD_CARD && id)
3694                        return -EINVAL;
3695                devno = channel;
3696        }
3697
3698        spin_lock_irqsave(ap->lock, flags);
3699
3700        if (devno == SCAN_WILD_CARD) {
3701                struct ata_link *link;
3702
3703                ata_for_each_link(link, ap, EDGE) {
3704                        struct ata_eh_info *ehi = &link->eh_info;
3705                        ehi->probe_mask |= ATA_ALL_DEVICES;
3706                        ehi->action |= ATA_EH_RESET;
3707                }
3708        } else {
3709                struct ata_device *dev = ata_find_dev(ap, devno);
3710
3711                if (dev) {
3712                        struct ata_eh_info *ehi = &dev->link->eh_info;
3713                        ehi->probe_mask |= 1 << dev->devno;
3714                        ehi->action |= ATA_EH_RESET;
3715                } else
3716                        rc = -EINVAL;
3717        }
3718
3719        if (rc == 0) {
3720                ata_port_schedule_eh(ap);
3721                spin_unlock_irqrestore(ap->lock, flags);
3722                ata_port_wait_eh(ap);
3723        } else
3724                spin_unlock_irqrestore(ap->lock, flags);
3725
3726        return rc;
3727}
3728
3729/**
3730 *      ata_scsi_dev_rescan - initiate scsi_rescan_device()
3731 *      @work: Pointer to ATA port to perform scsi_rescan_device()
3732 *
3733 *      After ATA pass thru (SAT) commands are executed successfully,
3734 *      libata need to propagate the changes to SCSI layer.
3735 *
3736 *      LOCKING:
3737 *      Kernel thread context (may sleep).
3738 */
3739void ata_scsi_dev_rescan(struct work_struct *work)
3740{
3741        struct ata_port *ap =
3742                container_of(work, struct ata_port, scsi_rescan_task);
3743        struct ata_link *link;
3744        struct ata_device *dev;
3745        unsigned long flags;
3746
3747        mutex_lock(&ap->scsi_scan_mutex);
3748        spin_lock_irqsave(ap->lock, flags);
3749
3750        ata_for_each_link(link, ap, EDGE) {
3751                ata_for_each_dev(dev, link, ENABLED) {
3752                        struct scsi_device *sdev = dev->sdev;
3753
3754                        if (!sdev)
3755                                continue;
3756                        if (scsi_device_get(sdev))
3757                                continue;
3758
3759                        spin_unlock_irqrestore(ap->lock, flags);
3760                        scsi_rescan_device(&(sdev->sdev_gendev));
3761                        scsi_device_put(sdev);
3762                        spin_lock_irqsave(ap->lock, flags);
3763                }
3764        }
3765
3766        spin_unlock_irqrestore(ap->lock, flags);
3767        mutex_unlock(&ap->scsi_scan_mutex);
3768}
3769
3770/**
3771 *      ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3772 *      @host: ATA host container for all SAS ports
3773 *      @port_info: Information from low-level host driver
3774 *      @shost: SCSI host that the scsi device is attached to
3775 *
3776 *      LOCKING:
3777 *      PCI/etc. bus probe sem.
3778 *
3779 *      RETURNS:
3780 *      ata_port pointer on success / NULL on failure.
3781 */
3782
3783struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3784                                    struct ata_port_info *port_info,
3785                                    struct Scsi_Host *shost)
3786{
3787        struct ata_port *ap;
3788
3789        ap = ata_port_alloc(host);
3790        if (!ap)
3791                return NULL;
3792
3793        ap->port_no = 0;
3794        ap->lock = &host->lock;
3795        ap->pio_mask = port_info->pio_mask;
3796        ap->mwdma_mask = port_info->mwdma_mask;
3797        ap->udma_mask = port_info->udma_mask;
3798        ap->flags |= port_info->flags;
3799        ap->ops = port_info->port_ops;
3800        ap->cbl = ATA_CBL_SATA;
3801
3802        return ap;
3803}
3804EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3805
3806/**
3807 *      ata_sas_port_start - Set port up for dma.
3808 *      @ap: Port to initialize
3809 *
3810 *      Called just after data structures for each port are
3811 *      initialized.
3812 *
3813 *      May be used as the port_start() entry in ata_port_operations.
3814 *
3815 *      LOCKING:
3816 *      Inherited from caller.
3817 */
3818int ata_sas_port_start(struct ata_port *ap)
3819{
3820        /*
3821         * the port is marked as frozen at allocation time, but if we don't
3822         * have new eh, we won't thaw it
3823         */
3824        if (!ap->ops->error_handler)
3825                ap->pflags &= ~ATA_PFLAG_FROZEN;
3826        return 0;
3827}
3828EXPORT_SYMBOL_GPL(ata_sas_port_start);
3829
3830/**
3831 *      ata_port_stop - Undo ata_sas_port_start()
3832 *      @ap: Port to shut down
3833 *
3834 *      May be used as the port_stop() entry in ata_port_operations.
3835 *
3836 *      LOCKING:
3837 *      Inherited from caller.
3838 */
3839
3840void ata_sas_port_stop(struct ata_port *ap)
3841{
3842}
3843EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3844
3845/**
3846 * ata_sas_async_probe - simply schedule probing and return
3847 * @ap: Port to probe
3848 *
3849 * For batch scheduling of probe for sas attached ata devices, assumes
3850 * the port has already been through ata_sas_port_init()
3851 */
3852void ata_sas_async_probe(struct ata_port *ap)
3853{
3854        __ata_port_probe(ap);
3855}
3856EXPORT_SYMBOL_GPL(ata_sas_async_probe);
3857
3858int ata_sas_sync_probe(struct ata_port *ap)
3859{
3860        return ata_port_probe(ap);
3861}
3862EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
3863
3864
3865/**
3866 *      ata_sas_port_init - Initialize a SATA device
3867 *      @ap: SATA port to initialize
3868 *
3869 *      LOCKING:
3870 *      PCI/etc. bus probe sem.
3871 *
3872 *      RETURNS:
3873 *      Zero on success, non-zero on error.
3874 */
3875
3876int ata_sas_port_init(struct ata_port *ap)
3877{
3878        int rc = ap->ops->port_start(ap);
3879
3880        if (rc)
3881                return rc;
3882        ap->print_id = atomic_inc_return(&ata_print_id);
3883        return 0;
3884}
3885EXPORT_SYMBOL_GPL(ata_sas_port_init);
3886
3887/**
3888 *      ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3889 *      @ap: SATA port to destroy
3890 *
3891 */
3892
3893void ata_sas_port_destroy(struct ata_port *ap)
3894{
3895        if (ap->ops->port_stop)
3896                ap->ops->port_stop(ap);
3897        kfree(ap);
3898}
3899EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3900
3901/**
3902 *      ata_sas_slave_configure - Default slave_config routine for libata devices
3903 *      @sdev: SCSI device to configure
3904 *      @ap: ATA port to which SCSI device is attached
3905 *
3906 *      RETURNS:
3907 *      Zero.
3908 */
3909
3910int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3911{
3912        ata_scsi_sdev_config(sdev);
3913        ata_scsi_dev_config(sdev, ap->link.device);
3914        return 0;
3915}
3916EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3917
3918/**
3919 *      ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3920 *      @cmd: SCSI command to be sent
3921 *      @ap:    ATA port to which the command is being sent
3922 *
3923 *      RETURNS:
3924 *      Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3925 *      0 otherwise.
3926 */
3927
3928int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
3929{
3930        int rc = 0;
3931
3932        ata_scsi_dump_cdb(ap, cmd);
3933
3934        if (likely(ata_dev_enabled(ap->link.device)))
3935                rc = __ata_scsi_queuecmd(cmd, ap->link.device);
3936        else {
3937                cmd->result = (DID_BAD_TARGET << 16);
3938                cmd->scsi_done(cmd);
3939        }
3940        return rc;
3941}
3942EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
3943
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