drivers/ide/ide-eh.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/export.h>
   4 #include <linux/ide.h>
   5 #include <linux/delay.h>
   6
   7 static 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
  63 static 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
  93 static 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
 114 ide_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 }
 144 EXPORT_SYMBOL_GPL(ide_error);
 145
 146 static 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 */
 159 static 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  */
 167 static 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
 198 static 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  */
 223 static 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         }
 263 out:
 264         hwif->polling = 0;      /* done polling */
 265         ide_complete_drive_reset(drive, err);
 266         return ide_stopped;
 267 }
 268
 269 static 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
 287 static 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  */
 334 static 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
 438 ide_startstop_t ide_do_reset(ide_drive_t *drive)
 439 {
 440         return do_reset1(drive, 0);
 441 }
 442 EXPORT_SYMBOL(ide_do_reset);