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                 rq->errors = 1;
 127                 ide_end_drive_cmd(drive, stat, err);
 128                 return ide_stopped;
 129         }
 130
 131         return __ide_error(drive, rq, stat, err);
 132 }
 133 EXPORT_SYMBOL_GPL(ide_error);
 134
 135 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 136 {
 137         struct request *rq = drive->hwif->rq;
 138
 139         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
 140                 ide_end_request(drive, err ? err : 1, 0);
 141 }
 142
 143 /* needed below */
 144 static ide_startstop_t do_reset1(ide_drive_t *, int);
 145
 146 /*
 147  * atapi_reset_pollfunc() gets invoked to poll the interface for completion
 148  * every 50ms during an atapi drive reset operation.  If the drive has not yet
 149  * responded, and we have not yet hit our maximum waiting time, then the timer
 150  * is restarted for another 50ms.
 151  */
 152 static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
 153 {
 154         ide_hwif_t *hwif = drive->hwif;
 155         u8 stat;
 156
 157         SELECT_DRIVE(drive);
 158         udelay(10);
 159         stat = hwif->tp_ops->read_status(hwif);
 160
 161         if (OK_STAT(stat, 0, ATA_BUSY))
 162                 printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
 163         else {
 164                 if (time_before(jiffies, hwif->poll_timeout)) {
 165                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20,
 166                                         NULL);
 167                         /* continue polling */
 168                         return ide_started;
 169                 }
 170                 /* end of polling */
 171                 hwif->polling = 0;
 172                 printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
 173                         drive->name, stat);
 174                 /* do it the old fashioned way */
 175                 return do_reset1(drive, 1);
 176         }
 177         /* done polling */
 178         hwif->polling = 0;
 179         ide_complete_drive_reset(drive, 0);
 180         return ide_stopped;
 181 }
 182
 183 static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
 184 {
 185         static const char *err_master_vals[] =
 186                 { NULL, "passed", "formatter device error",
 187                   "sector buffer error", "ECC circuitry error",
 188                   "controlling MPU error" };
 189
 190         u8 err_master = err & 0x7f;
 191
 192         printk(KERN_ERR "%s: reset: master: ", hwif->name);
 193         if (err_master && err_master < 6)
 194                 printk(KERN_CONT "%s", err_master_vals[err_master]);
 195         else
 196                 printk(KERN_CONT "error (0x%02x?)", err);
 197         if (err & 0x80)
 198                 printk(KERN_CONT "; slave: failed");
 199         printk(KERN_CONT "\n");
 200 }
 201
 202 /*
 203  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 204  * during an ide reset operation. If the drives have not yet responded,
 205  * and we have not yet hit our maximum waiting time, then the timer is restarted
 206  * for another 50ms.
 207  */
 208 static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
 209 {
 210         ide_hwif_t *hwif = drive->hwif;
 211         const struct ide_port_ops *port_ops = hwif->port_ops;
 212         u8 tmp;
 213         int err = 0;
 214
 215         if (port_ops && port_ops->reset_poll) {
 216                 err = port_ops->reset_poll(drive);
 217                 if (err) {
 218                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 219                                 hwif->name, drive->name);
 220                         goto out;
 221                 }
 222         }
 223
 224         tmp = hwif->tp_ops->read_status(hwif);
 225
 226         if (!OK_STAT(tmp, 0, ATA_BUSY)) {
 227                 if (time_before(jiffies, hwif->poll_timeout)) {
 228                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 229                         /* continue polling */
 230                         return ide_started;
 231                 }
 232                 printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
 233                         hwif->name, tmp);
 234                 drive->failures++;
 235                 err = -EIO;
 236         } else  {
 237                 tmp = ide_read_error(drive);
 238
 239                 if (tmp == 1) {
 240                         printk(KERN_INFO "%s: reset: success\n", hwif->name);
 241                         drive->failures = 0;
 242                 } else {
 243                         ide_reset_report_error(hwif, tmp);
 244                         drive->failures++;
 245                         err = -EIO;
 246                 }
 247         }
 248 out:
 249         hwif->polling = 0;      /* done polling */
 250         ide_complete_drive_reset(drive, err);
 251         return ide_stopped;
 252 }
 253
 254 static void ide_disk_pre_reset(ide_drive_t *drive)
 255 {
 256         int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
 257
 258         drive->special.all = 0;
 259         drive->special.b.set_geometry = legacy;
 260         drive->special.b.recalibrate  = legacy;
 261
 262         drive->mult_count = 0;
 263         drive->dev_flags &= ~IDE_DFLAG_PARKED;
 264
 265         if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
 266             (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
 267                 drive->mult_req = 0;
 268
 269         if (drive->mult_req != drive->mult_count)
 270                 drive->special.b.set_multmode = 1;
 271 }
 272
 273 static void pre_reset(ide_drive_t *drive)
 274 {
 275         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 276
 277         if (drive->media == ide_disk)
 278                 ide_disk_pre_reset(drive);
 279         else
 280                 drive->dev_flags |= IDE_DFLAG_POST_RESET;
 281
 282         if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
 283                 if (drive->crc_count)
 284                         ide_check_dma_crc(drive);
 285                 else
 286                         ide_dma_off(drive);
 287         }
 288
 289         if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
 290                 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
 291                         drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 292                         drive->io_32bit = 0;
 293                 }
 294                 return;
 295         }
 296
 297         if (port_ops && port_ops->pre_reset)
 298                 port_ops->pre_reset(drive);
 299
 300         if (drive->current_speed != 0xff)
 301                 drive->desired_speed = drive->current_speed;
 302         drive->current_speed = 0xff;
 303 }
 304
 305 /*
 306  * do_reset1() attempts to recover a confused drive by resetting it.
 307  * Unfortunately, resetting a disk drive actually resets all devices on
 308  * the same interface, so it can really be thought of as resetting the
 309  * interface rather than resetting the drive.
 310  *
 311  * ATAPI devices have their own reset mechanism which allows them to be
 312  * individually reset without clobbering other devices on the same interface.
 313  *
 314  * Unfortunately, the IDE interface does not generate an interrupt to let
 315  * us know when the reset operation has finished, so we must poll for this.
 316  * Equally poor, though, is the fact that this may a very long time to complete,
 317  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
 318  * we set a timer to poll at 50ms intervals.
 319  */
 320 static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
 321 {
 322         ide_hwif_t *hwif = drive->hwif;
 323         struct ide_io_ports *io_ports = &hwif->io_ports;
 324         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 325         const struct ide_port_ops *port_ops;
 326         ide_drive_t *tdrive;
 327         unsigned long flags, timeout;
 328         int i;
 329         DEFINE_WAIT(wait);
 330
 331         spin_lock_irqsave(&hwif->lock, flags);
 332
 333         /* We must not reset with running handlers */
 334         BUG_ON(hwif->handler != NULL);
 335
 336         /* For an ATAPI device, first try an ATAPI SRST. */
 337         if (drive->media != ide_disk && !do_not_try_atapi) {
 338                 pre_reset(drive);
 339                 SELECT_DRIVE(drive);
 340                 udelay(20);
 341                 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 342                 ndelay(400);
 343                 hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 344                 hwif->polling = 1;
 345                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 346                 spin_unlock_irqrestore(&hwif->lock, flags);
 347                 return ide_started;
 348         }
 349
 350         /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
 351         do {
 352                 unsigned long now;
 353
 354                 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
 355                 timeout = jiffies;
 356                 ide_port_for_each_present_dev(i, tdrive, hwif) {
 357                         if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
 358                             time_after(tdrive->sleep, timeout))
 359                                 timeout = tdrive->sleep;
 360                 }
 361
 362                 now = jiffies;
 363                 if (time_before_eq(timeout, now))
 364                         break;
 365
 366                 spin_unlock_irqrestore(&hwif->lock, flags);
 367                 timeout = schedule_timeout_uninterruptible(timeout - now);
 368                 spin_lock_irqsave(&hwif->lock, flags);
 369         } while (timeout);
 370         finish_wait(&ide_park_wq, &wait);
 371
 372         /*
 373          * First, reset any device state data we were maintaining
 374          * for any of the drives on this interface.
 375          */
 376         ide_port_for_each_dev(i, tdrive, hwif)
 377                 pre_reset(tdrive);
 378
 379         if (io_ports->ctl_addr == 0) {
 380                 spin_unlock_irqrestore(&hwif->lock, flags);
 381                 ide_complete_drive_reset(drive, -ENXIO);
 382                 return ide_stopped;
 383         }
 384
 385         /*
 386          * Note that we also set nIEN while resetting the device,
 387          * to mask unwanted interrupts from the interface during the reset.
 388          * However, due to the design of PC hardware, this will cause an
 389          * immediate interrupt due to the edge transition it produces.
 390          * This single interrupt gives us a "fast poll" for drives that
 391          * recover from reset very quickly, saving us the first 50ms wait time.
 392          *
 393          * TODO: add ->softreset method and stop abusing ->set_irq
 394          */
 395         /* set SRST and nIEN */
 396         tp_ops->set_irq(hwif, 4);
 397         /* more than enough time */
 398         udelay(10);
 399         /* clear SRST, leave nIEN (unless device is on the quirk list) */
 400         tp_ops->set_irq(hwif, drive->quirk_list == 2);
 401         /* more than enough time */
 402         udelay(10);
 403         hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 404         hwif->polling = 1;
 405         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 406
 407         /*
 408          * Some weird controller like resetting themselves to a strange
 409          * state when the disks are reset this way. At least, the Winbond
 410          * 553 documentation says that
 411          */
 412         port_ops = hwif->port_ops;
 413         if (port_ops && port_ops->resetproc)
 414                 port_ops->resetproc(drive);
 415
 416         spin_unlock_irqrestore(&hwif->lock, flags);
 417         return ide_started;
 418 }
 419
 420 /*
 421  * ide_do_reset() is the entry point to the drive/interface reset code.
 422  */
 423
 424 ide_startstop_t ide_do_reset(ide_drive_t *drive)
 425 {
 426         return do_reset1(drive, 0);
 427 }
 428 EXPORT_SYMBOL(ide_do_reset);