drivers/ide/ide-eh.c

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This source file includes following definitions.
ide_ata_error
ide_atapi_error
__ide_error
ide_error
ide_complete_drive_reset
atapi_reset_pollfunc
ide_reset_report_error
reset_pollfunc
ide_disk_pre_reset
pre_reset
do_reset1
ide_do_reset
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 
   3 #include <linux/kernel.h>
   4 #include <linux/export.h>
   5 #include <linux/ide.h>
   6 #include <linux/delay.h>
   7 
   8 static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq,
   9                                      u8 stat, u8 err)
  10 {
  11         ide_hwif_t *hwif = drive->hwif;
  12 
  13         if ((stat & ATA_BUSY) ||
  14             ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
  15                 /* other bits are useless when BUSY */
  16                 scsi_req(rq)->result |= ERROR_RESET;
  17         } else if (stat & ATA_ERR) {
  18                 /* err has different meaning on cdrom and tape */
  19                 if (err == ATA_ABORTED) {
  20                         if ((drive->dev_flags & IDE_DFLAG_LBA) &&
  21                             /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
  22                             hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
  23                                 return ide_stopped;
  24                 } else if ((err & BAD_CRC) == BAD_CRC) {
  25                         /* UDMA crc error, just retry the operation */
  26                         drive->crc_count++;
  27                 } else if (err & (ATA_BBK | ATA_UNC)) {
  28                         /* retries won't help these */
  29                         scsi_req(rq)->result = ERROR_MAX;
  30                 } else if (err & ATA_TRK0NF) {
  31                         /* help it find track zero */
  32                         scsi_req(rq)->result |= ERROR_RECAL;
  33                 }
  34         }
  35 
  36         if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
  37             (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
  38                 int nsect = drive->mult_count ? drive->mult_count : 1;
  39 
  40                 ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
  41         }
  42 
  43         if (scsi_req(rq)->result >= ERROR_MAX || blk_noretry_request(rq)) {
  44                 ide_kill_rq(drive, rq);
  45                 return ide_stopped;
  46         }
  47 
  48         if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
  49                 scsi_req(rq)->result |= ERROR_RESET;
  50 
  51         if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
  52                 ++scsi_req(rq)->result;
  53                 return ide_do_reset(drive);
  54         }
  55 
  56         if ((scsi_req(rq)->result & ERROR_RECAL) == ERROR_RECAL)
  57                 drive->special_flags |= IDE_SFLAG_RECALIBRATE;
  58 
  59         ++scsi_req(rq)->result;
  60 
  61         return ide_stopped;
  62 }
  63 
  64 static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq,
  65                                        u8 stat, u8 err)
  66 {
  67         ide_hwif_t *hwif = drive->hwif;
  68 
  69         if ((stat & ATA_BUSY) ||
  70             ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
  71                 /* other bits are useless when BUSY */
  72                 scsi_req(rq)->result |= ERROR_RESET;
  73         } else {
  74                 /* add decoding error stuff */
  75         }
  76 
  77         if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
  78                 /* force an abort */
  79                 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
  80 
  81         if (scsi_req(rq)->result >= ERROR_MAX) {
  82                 ide_kill_rq(drive, rq);
  83         } else {
  84                 if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
  85                         ++scsi_req(rq)->result;
  86                         return ide_do_reset(drive);
  87                 }
  88                 ++scsi_req(rq)->result;
  89         }
  90 
  91         return ide_stopped;
  92 }
  93 
  94 static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq,
  95                                    u8 stat, u8 err)
  96 {
  97         if (drive->media == ide_disk)
  98                 return ide_ata_error(drive, rq, stat, err);
  99         return ide_atapi_error(drive, rq, stat, err);
 100 }
 101 
 102 /**
 103  *      ide_error       -       handle an error on the IDE
 104  *      @drive: drive the error occurred on
 105  *      @msg: message to report
 106  *      @stat: status bits
 107  *
 108  *      ide_error() takes action based on the error returned by the drive.
 109  *      For normal I/O that may well include retries. We deal with
 110  *      both new-style (taskfile) and old style command handling here.
 111  *      In the case of taskfile command handling there is work left to
 112  *      do
 113  */
 114 
 115 ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
 116 {
 117         struct request *rq;
 118         u8 err;
 119 
 120         err = ide_dump_status(drive, msg, stat);
 121 
 122         rq = drive->hwif->rq;
 123         if (rq == NULL)
 124                 return ide_stopped;
 125 
 126         /* retry only "normal" I/O: */
 127         if (blk_rq_is_passthrough(rq)) {
 128                 if (ata_taskfile_request(rq)) {
 129                         struct ide_cmd *cmd = ide_req(rq)->special;
 130 
 131                         if (cmd)
 132                                 ide_complete_cmd(drive, cmd, stat, err);
 133                 } else if (ata_pm_request(rq)) {
 134                         scsi_req(rq)->result = 1;
 135                         ide_complete_pm_rq(drive, rq);
 136                         return ide_stopped;
 137                 }
 138                 scsi_req(rq)->result = err;
 139                 ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq));
 140                 return ide_stopped;
 141         }
 142 
 143         return __ide_error(drive, rq, stat, err);
 144 }
 145 EXPORT_SYMBOL_GPL(ide_error);
 146 
 147 static inline void ide_complete_drive_reset(ide_drive_t *drive, blk_status_t err)
 148 {
 149         struct request *rq = drive->hwif->rq;
 150 
 151         if (rq && ata_misc_request(rq) &&
 152             scsi_req(rq)->cmd[0] == REQ_DRIVE_RESET) {
 153                 if (err <= 0 && scsi_req(rq)->result == 0)
 154                         scsi_req(rq)->result = -EIO;
 155                 ide_complete_rq(drive, err, blk_rq_bytes(rq));
 156         }
 157 }
 158 
 159 /* needed below */
 160 static ide_startstop_t do_reset1(ide_drive_t *, int);
 161 
 162 /*
 163  * atapi_reset_pollfunc() gets invoked to poll the interface for completion
 164  * every 50ms during an atapi drive reset operation.  If the drive has not yet
 165  * responded, and we have not yet hit our maximum waiting time, then the timer
 166  * is restarted for another 50ms.
 167  */
 168 static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
 169 {
 170         ide_hwif_t *hwif = drive->hwif;
 171         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 172         u8 stat;
 173 
 174         tp_ops->dev_select(drive);
 175         udelay(10);
 176         stat = tp_ops->read_status(hwif);
 177 
 178         if (OK_STAT(stat, 0, ATA_BUSY))
 179                 printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
 180         else {
 181                 if (time_before(jiffies, hwif->poll_timeout)) {
 182                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
 183                         /* continue polling */
 184                         return ide_started;
 185                 }
 186                 /* end of polling */
 187                 hwif->polling = 0;
 188                 printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
 189                         drive->name, stat);
 190                 /* do it the old fashioned way */
 191                 return do_reset1(drive, 1);
 192         }
 193         /* done polling */
 194         hwif->polling = 0;
 195         ide_complete_drive_reset(drive, BLK_STS_OK);
 196         return ide_stopped;
 197 }
 198 
 199 static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
 200 {
 201         static const char *err_master_vals[] =
 202                 { NULL, "passed", "formatter device error",
 203                   "sector buffer error", "ECC circuitry error",
 204                   "controlling MPU error" };
 205 
 206         u8 err_master = err & 0x7f;
 207 
 208         printk(KERN_ERR "%s: reset: master: ", hwif->name);
 209         if (err_master && err_master < 6)
 210                 printk(KERN_CONT "%s", err_master_vals[err_master]);
 211         else
 212                 printk(KERN_CONT "error (0x%02x?)", err);
 213         if (err & 0x80)
 214                 printk(KERN_CONT "; slave: failed");
 215         printk(KERN_CONT "\n");
 216 }
 217 
 218 /*
 219  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 220  * during an ide reset operation. If the drives have not yet responded,
 221  * and we have not yet hit our maximum waiting time, then the timer is restarted
 222  * for another 50ms.
 223  */
 224 static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
 225 {
 226         ide_hwif_t *hwif = drive->hwif;
 227         const struct ide_port_ops *port_ops = hwif->port_ops;
 228         u8 tmp;
 229         blk_status_t err = BLK_STS_OK;
 230 
 231         if (port_ops && port_ops->reset_poll) {
 232                 err = port_ops->reset_poll(drive);
 233                 if (err) {
 234                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 235                                 hwif->name, drive->name);
 236                         goto out;
 237                 }
 238         }
 239 
 240         tmp = hwif->tp_ops->read_status(hwif);
 241 
 242         if (!OK_STAT(tmp, 0, ATA_BUSY)) {
 243                 if (time_before(jiffies, hwif->poll_timeout)) {
 244                         ide_set_handler(drive, &reset_pollfunc, HZ/20);
 245                         /* continue polling */
 246                         return ide_started;
 247                 }
 248                 printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
 249                         hwif->name, tmp);
 250                 drive->failures++;
 251                 err = BLK_STS_IOERR;
 252         } else  {
 253                 tmp = ide_read_error(drive);
 254 
 255                 if (tmp == 1) {
 256                         printk(KERN_INFO "%s: reset: success\n", hwif->name);
 257                         drive->failures = 0;
 258                 } else {
 259                         ide_reset_report_error(hwif, tmp);
 260                         drive->failures++;
 261                         err = BLK_STS_IOERR;
 262                 }
 263         }
 264 out:
 265         hwif->polling = 0;      /* done polling */
 266         ide_complete_drive_reset(drive, err);
 267         return ide_stopped;
 268 }
 269 
 270 static void ide_disk_pre_reset(ide_drive_t *drive)
 271 {
 272         int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
 273 
 274         drive->special_flags =
 275                 legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0;
 276 
 277         drive->mult_count = 0;
 278         drive->dev_flags &= ~IDE_DFLAG_PARKED;
 279 
 280         if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
 281             (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
 282                 drive->mult_req = 0;
 283 
 284         if (drive->mult_req != drive->mult_count)
 285                 drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
 286 }
 287 
 288 static void pre_reset(ide_drive_t *drive)
 289 {
 290         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 291 
 292         if (drive->media == ide_disk)
 293                 ide_disk_pre_reset(drive);
 294         else
 295                 drive->dev_flags |= IDE_DFLAG_POST_RESET;
 296 
 297         if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
 298                 if (drive->crc_count)
 299                         ide_check_dma_crc(drive);
 300                 else
 301                         ide_dma_off(drive);
 302         }
 303 
 304         if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
 305                 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
 306                         drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 307                         drive->io_32bit = 0;
 308                 }
 309                 return;
 310         }
 311 
 312         if (port_ops && port_ops->pre_reset)
 313                 port_ops->pre_reset(drive);
 314 
 315         if (drive->current_speed != 0xff)
 316                 drive->desired_speed = drive->current_speed;
 317         drive->current_speed = 0xff;
 318 }
 319 
 320 /*
 321  * do_reset1() attempts to recover a confused drive by resetting it.
 322  * Unfortunately, resetting a disk drive actually resets all devices on
 323  * the same interface, so it can really be thought of as resetting the
 324  * interface rather than resetting the drive.
 325  *
 326  * ATAPI devices have their own reset mechanism which allows them to be
 327  * individually reset without clobbering other devices on the same interface.
 328  *
 329  * Unfortunately, the IDE interface does not generate an interrupt to let
 330  * us know when the reset operation has finished, so we must poll for this.
 331  * Equally poor, though, is the fact that this may a very long time to complete,
 332  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
 333  * we set a timer to poll at 50ms intervals.
 334  */
 335 static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
 336 {
 337         ide_hwif_t *hwif = drive->hwif;
 338         struct ide_io_ports *io_ports = &hwif->io_ports;
 339         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 340         const struct ide_port_ops *port_ops;
 341         ide_drive_t *tdrive;
 342         unsigned long flags, timeout;
 343         int i;
 344         DEFINE_WAIT(wait);
 345 
 346         spin_lock_irqsave(&hwif->lock, flags);
 347 
 348         /* We must not reset with running handlers */
 349         BUG_ON(hwif->handler != NULL);
 350 
 351         /* For an ATAPI device, first try an ATAPI SRST. */
 352         if (drive->media != ide_disk && !do_not_try_atapi) {
 353                 pre_reset(drive);
 354                 tp_ops->dev_select(drive);
 355                 udelay(20);
 356                 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 357                 ndelay(400);
 358                 hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 359                 hwif->polling = 1;
 360                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
 361                 spin_unlock_irqrestore(&hwif->lock, flags);
 362                 return ide_started;
 363         }
 364 
 365         /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
 366         do {
 367                 unsigned long now;
 368 
 369                 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
 370                 timeout = jiffies;
 371                 ide_port_for_each_present_dev(i, tdrive, hwif) {
 372                         if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
 373                             time_after(tdrive->sleep, timeout))
 374                                 timeout = tdrive->sleep;
 375                 }
 376 
 377                 now = jiffies;
 378                 if (time_before_eq(timeout, now))
 379                         break;
 380 
 381                 spin_unlock_irqrestore(&hwif->lock, flags);
 382                 timeout = schedule_timeout_uninterruptible(timeout - now);
 383                 spin_lock_irqsave(&hwif->lock, flags);
 384         } while (timeout);
 385         finish_wait(&ide_park_wq, &wait);
 386 
 387         /*
 388          * First, reset any device state data we were maintaining
 389          * for any of the drives on this interface.
 390          */
 391         ide_port_for_each_dev(i, tdrive, hwif)
 392                 pre_reset(tdrive);
 393 
 394         if (io_ports->ctl_addr == 0) {
 395                 spin_unlock_irqrestore(&hwif->lock, flags);
 396                 ide_complete_drive_reset(drive, BLK_STS_IOERR);
 397                 return ide_stopped;
 398         }
 399 
 400         /*
 401          * Note that we also set nIEN while resetting the device,
 402          * to mask unwanted interrupts from the interface during the reset.
 403          * However, due to the design of PC hardware, this will cause an
 404          * immediate interrupt due to the edge transition it produces.
 405          * This single interrupt gives us a "fast poll" for drives that
 406          * recover from reset very quickly, saving us the first 50ms wait time.
 407          */
 408         /* set SRST and nIEN */
 409         tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS);
 410         /* more than enough time */
 411         udelay(10);
 412         /* clear SRST, leave nIEN (unless device is on the quirk list) */
 413         tp_ops->write_devctl(hwif,
 414                 ((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) |
 415                  ATA_DEVCTL_OBS);
 416         /* more than enough time */
 417         udelay(10);
 418         hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
 419         hwif->polling = 1;
 420         __ide_set_handler(drive, &reset_pollfunc, HZ/20);
 421 
 422         /*
 423          * Some weird controller like resetting themselves to a strange
 424          * state when the disks are reset this way. At least, the Winbond
 425          * 553 documentation says that
 426          */
 427         port_ops = hwif->port_ops;
 428         if (port_ops && port_ops->resetproc)
 429                 port_ops->resetproc(drive);
 430 
 431         spin_unlock_irqrestore(&hwif->lock, flags);
 432         return ide_started;
 433 }
 434 
 435 /*
 436  * ide_do_reset() is the entry point to the drive/interface reset code.
 437  */
 438 
 439 ide_startstop_t ide_do_reset(ide_drive_t *drive)
 440 {
 441         return do_reset1(drive, 0);
 442 }
 443 EXPORT_SYMBOL(ide_do_reset);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/ide/ide-eh.c

DEFINITIONS
