#include <linux/kernel.h> #include <linux/ide.h> #include <linux/delay.h> static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) { ide_hwif_t *hwif = drive->hwif; if ((stat & ATA_BUSY) || ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { /* other bits are useless when BUSY */ rq->errors |= ERROR_RESET; } else if (stat & ATA_ERR) { /* err has different meaning on cdrom and tape */ if (err == ATA_ABORTED) { if ((drive->dev_flags & IDE_DFLAG_LBA) && /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) return ide_stopped; } else if ((err & BAD_CRC) == BAD_CRC) { /* UDMA crc error, just retry the operation */ drive->crc_count++; } else if (err & (ATA_BBK | ATA_UNC)) { /* retries won't help these */ rq->errors = ERROR_MAX; } else if (err & ATA_TRK0NF) { /* help it find track zero */ rq->errors |= ERROR_RECAL; } } if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { int nsect = drive->mult_count ? drive->mult_count : 1; ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); } if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { ide_kill_rq(drive, rq); return ide_stopped; } if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) rq->errors |= ERROR_RESET; if ((rq->errors & ERROR_RESET) == ERROR_RESET) { ++rq->errors; return ide_do_reset(drive); } if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) drive->special_flags |= IDE_SFLAG_RECALIBRATE; ++rq->errors; return ide_stopped; } static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) { ide_hwif_t *hwif = drive->hwif; if ((stat & ATA_BUSY) || ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { /* other bits are useless when BUSY */ rq->errors |= ERROR_RESET; } else { /* add decoding error stuff */ } if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) /* force an abort */ hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); if (rq->errors >= ERROR_MAX) { ide_kill_rq(drive, rq); } else { if ((rq->errors & ERROR_RESET) == ERROR_RESET) { ++rq->errors; return ide_do_reset(drive); } ++rq->errors; } return ide_stopped; } static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) { if (drive->media == ide_disk) return ide_ata_error(drive, rq, stat, err); return ide_atapi_error(drive, rq, stat, err); } /** * ide_error - handle an error on the IDE * @drive: drive the error occurred on * @msg: message to report * @stat: status bits * * ide_error() takes action based on the error returned by the drive. * For normal I/O that may well include retries. We deal with * both new-style (taskfile) and old style command handling here. * In the case of taskfile command handling there is work left to * do */ ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat) { struct request *rq; u8 err; err = ide_dump_status(drive, msg, stat); rq = drive->hwif->rq; if (rq == NULL) return ide_stopped; /* retry only "normal" I/O: */ if (rq->cmd_type != REQ_TYPE_FS) { if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { struct ide_cmd *cmd = rq->special; if (cmd) ide_complete_cmd(drive, cmd, stat, err); } else if (blk_pm_request(rq)) { rq->errors = 1; ide_complete_pm_rq(drive, rq); return ide_stopped; } rq->errors = err; ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq)); return ide_stopped; } return __ide_error(drive, rq, stat, err); } EXPORT_SYMBOL_GPL(ide_error); static inline void ide_complete_drive_reset(ide_drive_t *drive, int err) { struct request *rq = drive->hwif->rq; if (rq && rq->cmd_type == REQ_TYPE_SPECIAL && rq->cmd[0] == REQ_DRIVE_RESET) { if (err <= 0 && rq->errors == 0) rq->errors = -EIO; ide_complete_rq(drive, err ? err : 0, blk_rq_bytes(rq)); } } /* needed below */ static ide_startstop_t do_reset1(ide_drive_t *, int); /* * atapi_reset_pollfunc() gets invoked to poll the interface for completion * every 50ms during an atapi drive reset operation. If the drive has not yet * responded, and we have not yet hit our maximum waiting time, then the timer * is restarted for another 50ms. */ static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; const struct ide_tp_ops *tp_ops = hwif->tp_ops; u8 stat; tp_ops->dev_select(drive); udelay(10); stat = tp_ops->read_status(hwif); if (OK_STAT(stat, 0, ATA_BUSY)) printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name); else { if (time_before(jiffies, hwif->poll_timeout)) { ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); /* continue polling */ return ide_started; } /* end of polling */ hwif->polling = 0; printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat); /* do it the old fashioned way */ return do_reset1(drive, 1); } /* done polling */ hwif->polling = 0; ide_complete_drive_reset(drive, 0); return ide_stopped; } static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) { static const char *err_master_vals[] = { NULL, "passed", "formatter device error", "sector buffer error", "ECC circuitry error", "controlling MPU error" }; u8 err_master = err & 0x7f; printk(KERN_ERR "%s: reset: master: ", hwif->name); if (err_master && err_master < 6) printk(KERN_CONT "%s", err_master_vals[err_master]); else printk(KERN_CONT "error (0x%02x?)", err); if (err & 0x80) printk(KERN_CONT "; slave: failed"); printk(KERN_CONT "\n"); } /* * reset_pollfunc() gets invoked to poll the interface for completion every 50ms * during an ide reset operation. If the drives have not yet responded, * and we have not yet hit our maximum waiting time, then the timer is restarted * for another 50ms. */ static ide_startstop_t reset_pollfunc(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; const struct ide_port_ops *port_ops = hwif->port_ops; u8 tmp; int err = 0; if (port_ops && port_ops->reset_poll) { err = port_ops->reset_poll(drive); if (err) { printk(KERN_ERR "%s: host reset_poll failure for %s.\n", hwif->name, drive->name); goto out; } } tmp = hwif->tp_ops->read_status(hwif); if (!OK_STAT(tmp, 0, ATA_BUSY)) { if (time_before(jiffies, hwif->poll_timeout)) { ide_set_handler(drive, &reset_pollfunc, HZ/20); /* continue polling */ return ide_started; } printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n", hwif->name, tmp); drive->failures++; err = -EIO; } else { tmp = ide_read_error(drive); if (tmp == 1) { printk(KERN_INFO "%s: reset: success\n", hwif->name); drive->failures = 0; } else { ide_reset_report_error(hwif, tmp); drive->failures++; err = -EIO; } } out: hwif->polling = 0; /* done polling */ ide_complete_drive_reset(drive, err); return ide_stopped; } static void ide_disk_pre_reset(ide_drive_t *drive) { int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; drive->special_flags = legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0; drive->mult_count = 0; drive->dev_flags &= ~IDE_DFLAG_PARKED; if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) drive->mult_req = 0; if (drive->mult_req != drive->mult_count) drive->special_flags |= IDE_SFLAG_SET_MULTMODE; } static void pre_reset(ide_drive_t *drive) { const struct ide_port_ops *port_ops = drive->hwif->port_ops; if (drive->media == ide_disk) ide_disk_pre_reset(drive); else drive->dev_flags |= IDE_DFLAG_POST_RESET; if (drive->dev_flags & IDE_DFLAG_USING_DMA) { if (drive->crc_count) ide_check_dma_crc(drive); else ide_dma_off(drive); } if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { drive->dev_flags &= ~IDE_DFLAG_UNMASK; drive->io_32bit = 0; } return; } if (port_ops && port_ops->pre_reset) port_ops->pre_reset(drive); if (drive->current_speed != 0xff) drive->desired_speed = drive->current_speed; drive->current_speed = 0xff; } /* * do_reset1() attempts to recover a confused drive by resetting it. * Unfortunately, resetting a disk drive actually resets all devices on * the same interface, so it can really be thought of as resetting the * interface rather than resetting the drive. * * ATAPI devices have their own reset mechanism which allows them to be * individually reset without clobbering other devices on the same interface. * * Unfortunately, the IDE interface does not generate an interrupt to let * us know when the reset operation has finished, so we must poll for this. * Equally poor, though, is the fact that this may a very long time to complete, * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, * we set a timer to poll at 50ms intervals. */ static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi) { ide_hwif_t *hwif = drive->hwif; struct ide_io_ports *io_ports = &hwif->io_ports; const struct ide_tp_ops *tp_ops = hwif->tp_ops; const struct ide_port_ops *port_ops; ide_drive_t *tdrive; unsigned long flags, timeout; int i; DEFINE_WAIT(wait); spin_lock_irqsave(&hwif->lock, flags); /* We must not reset with running handlers */ BUG_ON(hwif->handler != NULL); /* For an ATAPI device, first try an ATAPI SRST. */ if (drive->media != ide_disk && !do_not_try_atapi) { pre_reset(drive); tp_ops->dev_select(drive); udelay(20); tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); ndelay(400); hwif->poll_timeout = jiffies + WAIT_WORSTCASE; hwif->polling = 1; __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); spin_unlock_irqrestore(&hwif->lock, flags); return ide_started; } /* We must not disturb devices in the IDE_DFLAG_PARKED state. */ do { unsigned long now; prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); timeout = jiffies; ide_port_for_each_present_dev(i, tdrive, hwif) { if ((tdrive->dev_flags & IDE_DFLAG_PARKED) && time_after(tdrive->sleep, timeout)) timeout = tdrive->sleep; } now = jiffies; if (time_before_eq(timeout, now)) break; spin_unlock_irqrestore(&hwif->lock, flags); timeout = schedule_timeout_uninterruptible(timeout - now); spin_lock_irqsave(&hwif->lock, flags); } while (timeout); finish_wait(&ide_park_wq, &wait); /* * First, reset any device state data we were maintaining * for any of the drives on this interface. */ ide_port_for_each_dev(i, tdrive, hwif) pre_reset(tdrive); if (io_ports->ctl_addr == 0) { spin_unlock_irqrestore(&hwif->lock, flags); ide_complete_drive_reset(drive, -ENXIO); return ide_stopped; } /* * Note that we also set nIEN while resetting the device, * to mask unwanted interrupts from the interface during the reset. * However, due to the design of PC hardware, this will cause an * immediate interrupt due to the edge transition it produces. * This single interrupt gives us a "fast poll" for drives that * recover from reset very quickly, saving us the first 50ms wait time. */ /* set SRST and nIEN */ tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS); /* more than enough time */ udelay(10); /* clear SRST, leave nIEN (unless device is on the quirk list) */ tp_ops->write_devctl(hwif, ((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) | ATA_DEVCTL_OBS); /* more than enough time */ udelay(10); hwif->poll_timeout = jiffies + WAIT_WORSTCASE; hwif->polling = 1; __ide_set_handler(drive, &reset_pollfunc, HZ/20); /* * Some weird controller like resetting themselves to a strange * state when the disks are reset this way. At least, the Winbond * 553 documentation says that */ port_ops = hwif->port_ops; if (port_ops && port_ops->resetproc) port_ops->resetproc(drive); spin_unlock_irqrestore(&hwif->lock, flags); return ide_started; } /* * ide_do_reset() is the entry point to the drive/interface reset code. */ ide_startstop_t ide_do_reset(ide_drive_t *drive) { return do_reset1(drive, 0); } EXPORT_SYMBOL(ide_do_reset);