linux/drivers/ide/ide-eh.c
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   1
   2#include <linux/kernel.h>
   3#include <linux/export.h>
   4#include <linux/ide.h>
   5#include <linux/delay.h>
   6
   7static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq,
   8                                     u8 stat, u8 err)
   9{
  10        ide_hwif_t *hwif = drive->hwif;
  11
  12        if ((stat & ATA_BUSY) ||
  13            ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
  14                /* other bits are useless when BUSY */
  15                rq->errors |= ERROR_RESET;
  16        } else if (stat & ATA_ERR) {
  17                /* err has different meaning on cdrom and tape */
  18                if (err == ATA_ABORTED) {
  19                        if ((drive->dev_flags & IDE_DFLAG_LBA) &&
  20                            /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
  21                            hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
  22                                return ide_stopped;
  23                } else if ((err & BAD_CRC) == BAD_CRC) {
  24                        /* UDMA crc error, just retry the operation */
  25                        drive->crc_count++;
  26                } else if (err & (ATA_BBK | ATA_UNC)) {
  27                        /* retries won't help these */
  28                        rq->errors = ERROR_MAX;
  29                } else if (err & ATA_TRK0NF) {
  30                        /* help it find track zero */
  31                        rq->errors |= ERROR_RECAL;
  32                }
  33        }
  34
  35        if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
  36            (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
  37                int nsect = drive->mult_count ? drive->mult_count : 1;
  38
  39                ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
  40        }
  41
  42        if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
  43                ide_kill_rq(drive, rq);
  44                return ide_stopped;
  45        }
  46
  47        if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
  48                rq->errors |= ERROR_RESET;
  49
  50        if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
  51                ++rq->errors;
  52                return ide_do_reset(drive);
  53        }
  54
  55        if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
  56                drive->special_flags |= IDE_SFLAG_RECALIBRATE;
  57
  58        ++rq->errors;
  59
  60        return ide_stopped;
  61}
  62
  63static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq,
  64                                       u8 stat, u8 err)
  65{
  66        ide_hwif_t *hwif = drive->hwif;
  67
  68        if ((stat & ATA_BUSY) ||
  69            ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
  70                /* other bits are useless when BUSY */
  71                rq->errors |= ERROR_RESET;
  72        } else {
  73                /* add decoding error stuff */
  74        }
  75
  76        if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
  77                /* force an abort */
  78                hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
  79
  80        if (rq->errors >= ERROR_MAX) {
  81                ide_kill_rq(drive, rq);
  82        } else {
  83                if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
  84                        ++rq->errors;
  85                        return ide_do_reset(drive);
  86                }
  87                ++rq->errors;
  88        }
  89
  90        return ide_stopped;
  91}
  92
  93static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq,
  94                                   u8 stat, u8 err)
  95{
  96        if (drive->media == ide_disk)
  97                return ide_ata_error(drive, rq, stat, err);
  98        return ide_atapi_error(drive, rq, stat, err);
  99}
 100
 101/**
 102 *      ide_error       -       handle an error on the IDE
 103 *      @drive: drive the error occurred on
 104 *      @msg: message to report
 105 *      @stat: status bits
 106 *
 107 *      ide_error() takes action based on the error returned by the drive.
 108 *      For normal I/O that may well include retries. We deal with
 109 *      both new-style (taskfile) and old style command handling here.
 110 *      In the case of taskfile command handling there is work left to
 111 *      do
 112 */
 113
 114ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
 115{
 116        struct request *rq;
 117        u8 err;
 118
 119        err = ide_dump_status(drive, msg, stat);
 120
 121        rq = drive->hwif->rq;
 122        if (rq == NULL)
 123                return ide_stopped;
 124
 125        /* retry only "normal" I/O: */
 126        if (rq->cmd_type != REQ_TYPE_FS) {
 127                if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
 128                        struct ide_cmd *cmd = rq->special;
 129
 130                        if (cmd)
 131                                ide_complete_cmd(drive, cmd, stat, err);
 132                } else if (blk_pm_request(rq)) {
 133                        rq->errors = 1;
 134                        ide_complete_pm_rq(drive, rq);
 135                        return ide_stopped;
 136                }
 137                rq->errors = err;
 138                ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq));
 139                return ide_stopped;
 140        }
 141
 142        return __ide_error(drive, rq, stat, err);
 143}
 144EXPORT_SYMBOL_GPL(ide_error);
 145
 146static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 147{
 148        struct request *rq = drive->hwif->rq;
 149
 150        if (rq && rq->cmd_type == REQ_TYPE_SPECIAL &&
 151            rq->cmd[0] == REQ_DRIVE_RESET) {
 152                if (err <= 0 && rq->errors == 0)
 153                        rq->errors = -EIO;
 154                ide_complete_rq(drive, err ? err : 0, blk_rq_bytes(rq));
 155        }
 156}
 157
 158/* needed below */
 159static ide_startstop_t do_reset1(ide_drive_t *, int);
 160
 161/*
 162 * atapi_reset_pollfunc() gets invoked to poll the interface for completion
 163 * every 50ms during an atapi drive reset operation.  If the drive has not yet
 164 * responded, and we have not yet hit our maximum waiting time, then the timer
 165 * is restarted for another 50ms.
 166 */
 167static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
 168{
 169        ide_hwif_t *hwif = drive->hwif;
 170        const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 171        u8 stat;
 172
 173        tp_ops->dev_select(drive);
 174        udelay(10);
 175        stat = tp_ops->read_status(hwif);
 176
 177        if (OK_STAT(stat, 0, ATA_BUSY))
 178                printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
 179        else {
 180                if (time_before(jiffies, hwif->poll_timeout)) {
 181                        ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
 182                        /* continue polling */
 183                        return ide_started;
 184                }
 185                /* end of polling */
 186                hwif->polling = 0;
 187                printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
 188                        drive->name, stat);
 189                /* do it the old fashioned way */
 190                return do_reset1(drive, 1);
 191        }
 192        /* done polling */
 193        hwif->polling = 0;
 194        ide_complete_drive_reset(drive, 0);
 195        return ide_stopped;
 196}
 197
 198static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
 199{
 200        static const char *err_master_vals[] =
 201                { NULL, "passed", "formatter device error",
 202                  "sector buffer error", "ECC circuitry error",
 203                  "controlling MPU error" };
 204
 205        u8 err_master = err & 0x7f;
 206
 207        printk(KERN_ERR "%s: reset: master: ", hwif->name);
 208        if (err_master && err_master < 6)
 209                printk(KERN_CONT "%s", err_master_vals[err_master]);
 210        else
 211                printk(KERN_CONT "error (0x%02x?)", err);
 212        if (err & 0x80)
 213                printk(KERN_CONT "; slave: failed");
 214        printk(KERN_CONT "\n");
 215}
 216
 217/*
 218 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 219 * during an ide reset operation. If the drives have not yet responded,
 220 * and we have not yet hit our maximum waiting time, then the timer is restarted
 221 * for another 50ms.
 222 */
 223static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
 224{
 225        ide_hwif_t *hwif = drive->hwif;
 226        const struct ide_port_ops *port_ops = hwif->port_ops;
 227        u8 tmp;
 228        int err = 0;
 229
 230        if (port_ops && port_ops->reset_poll) {
 231                err = port_ops->reset_poll(drive);
 232                if (err) {
 233                        printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 234                                hwif->name, drive->name);
 235                        goto out;
 236                }
 237        }
 238
 239        tmp = hwif->tp_ops->read_status(hwif);
 240
 241        if (!OK_STAT(tmp, 0, ATA_BUSY)) {
 242                if (time_before(jiffies, hwif->poll_timeout)) {
 243                        ide_set_handler(drive, &reset_pollfunc, HZ/20);
 244                        /* continue polling */
 245                        return ide_started;
 246                }
 247                printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
 248                        hwif->name, tmp);
 249                drive->failures++;
 250                err = -EIO;
 251        } else  {
 252                tmp = ide_read_error(drive);
 253
 254                if (tmp == 1) {
 255                        printk(KERN_INFO "%s: reset: success\n", hwif->name);
 256                        drive->failures = 0;
 257                } else {
 258                        ide_reset_report_error(hwif, tmp);
 259                        drive->failures++;
 260                        err = -EIO;
 261                }
 262        }
 263out:
 264        hwif->polling = 0;      /* done polling */
 265        ide_complete_drive_reset(drive, err);
 266        return ide_stopped;
 267}
 268
 269static void ide_disk_pre_reset(ide_drive_t *drive)
 270{
 271        int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
 272
 273        drive->special_flags =
 274                legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0;
 275
 276        drive->mult_count = 0;
 277        drive->dev_flags &= ~IDE_DFLAG_PARKED;
 278
 279        if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
 280            (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
 281                drive->mult_req = 0;
 282
 283        if (drive->mult_req != drive->mult_count)
 284                drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
 285}
 286
 287static void pre_reset(ide_drive_t *drive)
 288{
 289        const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 290
 291        if (drive->media == ide_disk)
 292                ide_disk_pre_reset(drive);
 293        else
 294                drive->dev_flags |= IDE_DFLAG_POST_RESET;
 295
 296        if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
 297                if (drive->crc_count)
 298                        ide_check_dma_crc(drive);
 299                else
 300                        ide_dma_off(drive);
 301        }
 302
 303        if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
 304                if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
 305                        drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 306                        drive->io_32bit = 0;
 307                }
 308                return;
 309        }
 310
 311        if (port_ops && port_ops->pre_reset)
 312                port_ops->pre_reset(drive);
 313
 314        if (drive->current_speed != 0xff)
 315                drive->desired_speed = drive->current_speed;
 316        drive->current_speed = 0xff;
 317}
 318
 319/*
 320 * do_reset1() attempts to recover a confused drive by resetting it.
 321 * Unfortunately, resetting a disk drive actually resets all devices on
 322 * the same interface, so it can really be thought of as resetting the
 323 * interface rather than resetting the drive.
 324 *
 325 * ATAPI devices have their own reset mechanism which allows them to be
 326 * individually reset without clobbering other devices on the same interface.
 327 *
 328 * Unfortunately, the IDE interface does not generate an interrupt to let
 329 * us know when the reset operation has finished, so we must poll for this.
 330 * Equally poor, though, is the fact that this may a very long time to complete,
 331 * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
 332 * we set a timer to poll at 50ms intervals.
 333 */
 334static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
 335{
 336        ide_hwif_t *hwif = drive->hwif;
 337        struct ide_io_ports *io_ports = &hwif->io_ports;
 338        const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 339        const struct ide_port_ops *port_ops;
 340        ide_drive_t *tdrive;
 341        unsigned long flags, timeout;
 342        int i;
 343        DEFINE_WAIT(wait);
 344
 345        spin_lock_irqsave(&hwif->lock, flags);
 346
 347        /* We must not reset with running handlers */
 348        BUG_ON(hwif->handler != NULL);
 349
 350        /* For an ATAPI device, first try an ATAPI SRST. */
 351        if (drive->media != ide_disk && !do_not_try_atapi) {
 352                pre_reset(drive);
 353                tp_ops->dev_select(drive);
 354                udelay(20);
 355                tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 356                ndelay(400);
 357                hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 358                hwif->polling = 1;
 359                __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
 360                spin_unlock_irqrestore(&hwif->lock, flags);
 361                return ide_started;
 362        }
 363
 364        /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
 365        do {
 366                unsigned long now;
 367
 368                prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
 369                timeout = jiffies;
 370                ide_port_for_each_present_dev(i, tdrive, hwif) {
 371                        if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
 372                            time_after(tdrive->sleep, timeout))
 373                                timeout = tdrive->sleep;
 374                }
 375
 376                now = jiffies;
 377                if (time_before_eq(timeout, now))
 378                        break;
 379
 380                spin_unlock_irqrestore(&hwif->lock, flags);
 381                timeout = schedule_timeout_uninterruptible(timeout - now);
 382                spin_lock_irqsave(&hwif->lock, flags);
 383        } while (timeout);
 384        finish_wait(&ide_park_wq, &wait);
 385
 386        /*
 387         * First, reset any device state data we were maintaining
 388         * for any of the drives on this interface.
 389         */
 390        ide_port_for_each_dev(i, tdrive, hwif)
 391                pre_reset(tdrive);
 392
 393        if (io_ports->ctl_addr == 0) {
 394                spin_unlock_irqrestore(&hwif->lock, flags);
 395                ide_complete_drive_reset(drive, -ENXIO);
 396                return ide_stopped;
 397        }
 398
 399        /*
 400         * Note that we also set nIEN while resetting the device,
 401         * to mask unwanted interrupts from the interface during the reset.
 402         * However, due to the design of PC hardware, this will cause an
 403         * immediate interrupt due to the edge transition it produces.
 404         * This single interrupt gives us a "fast poll" for drives that
 405         * recover from reset very quickly, saving us the first 50ms wait time.
 406         */
 407        /* set SRST and nIEN */
 408        tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS);
 409        /* more than enough time */
 410        udelay(10);
 411        /* clear SRST, leave nIEN (unless device is on the quirk list) */
 412        tp_ops->write_devctl(hwif,
 413                ((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) |
 414                 ATA_DEVCTL_OBS);
 415        /* more than enough time */
 416        udelay(10);
 417        hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 418        hwif->polling = 1;
 419        __ide_set_handler(drive, &reset_pollfunc, HZ/20);
 420
 421        /*
 422         * Some weird controller like resetting themselves to a strange
 423         * state when the disks are reset this way. At least, the Winbond
 424         * 553 documentation says that
 425         */
 426        port_ops = hwif->port_ops;
 427        if (port_ops && port_ops->resetproc)
 428                port_ops->resetproc(drive);
 429
 430        spin_unlock_irqrestore(&hwif->lock, flags);
 431        return ide_started;
 432}
 433
 434/*
 435 * ide_do_reset() is the entry point to the drive/interface reset code.
 436 */
 437
 438ide_startstop_t ide_do_reset(ide_drive_t *drive)
 439{
 440        return do_reset1(drive, 0);
 441}
 442EXPORT_SYMBOL(ide_do_reset);
 443
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