drivers/ide/ide-eh.c

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