diff options
Diffstat (limited to 'drivers/ide/ide-io.c')
| -rw-r--r-- | drivers/ide/ide-io.c | 1102 |
1 files changed, 378 insertions, 724 deletions
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c index 1c36a8e83d3..177db6d5b2f 100644 --- a/drivers/ide/ide-io.c +++ b/drivers/ide/ide-io.c @@ -40,7 +40,6 @@ #include <linux/pci.h> #include <linux/delay.h> #include <linux/ide.h> -#include <linux/hdreg.h> #include <linux/completion.h> #include <linux/reboot.h> #include <linux/cdrom.h> @@ -55,25 +54,9 @@ #include <asm/uaccess.h> #include <asm/io.h> -static int __ide_end_request(ide_drive_t *drive, struct request *rq, - int uptodate, unsigned int nr_bytes, int dequeue) +int ide_end_rq(ide_drive_t *drive, struct request *rq, int error, + unsigned int nr_bytes) { - int ret = 1; - int error = 0; - - if (uptodate <= 0) - error = uptodate ? uptodate : -EIO; - - /* - * if failfast is set on a request, override number of sectors and - * complete the whole request right now - */ - if (blk_noretry_request(rq) && error) - nr_bytes = rq->hard_nr_sectors << 9; - - if (!blk_fs_request(rq) && error && !rq->errors) - rq->errors = -EIO; - /* * decide whether to reenable DMA -- 3 is a random magic for now, * if we DMA timeout more than 3 times, just stay in PIO @@ -84,264 +67,91 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq, ide_dma_on(drive); } - if (!blk_end_request(rq, error, nr_bytes)) - ret = 0; - - if (ret == 0 && dequeue) - drive->hwif->hwgroup->rq = NULL; - - return ret; -} - -/** - * ide_end_request - complete an IDE I/O - * @drive: IDE device for the I/O - * @uptodate: - * @nr_sectors: number of sectors completed - * - * This is our end_request wrapper function. We complete the I/O - * update random number input and dequeue the request, which if - * it was tagged may be out of order. - */ - -int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) -{ - unsigned int nr_bytes = nr_sectors << 9; - struct request *rq = drive->hwif->hwgroup->rq; - - if (!nr_bytes) { - if (blk_pc_request(rq)) - nr_bytes = rq->data_len; - else - nr_bytes = rq->hard_cur_sectors << 9; - } - - return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); + return blk_end_request(rq, error, nr_bytes); } -EXPORT_SYMBOL(ide_end_request); +EXPORT_SYMBOL_GPL(ide_end_rq); -/** - * ide_end_dequeued_request - complete an IDE I/O - * @drive: IDE device for the I/O - * @uptodate: - * @nr_sectors: number of sectors completed - * - * Complete an I/O that is no longer on the request queue. This - * typically occurs when we pull the request and issue a REQUEST_SENSE. - * We must still finish the old request but we must not tamper with the - * queue in the meantime. - * - * NOTE: This path does not handle barrier, but barrier is not supported - * on ide-cd anyway. - */ - -int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, - int uptodate, int nr_sectors) +void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) { - BUG_ON(!blk_rq_started(rq)); - - return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); -} -EXPORT_SYMBOL_GPL(ide_end_dequeued_request); - -/** - * ide_end_drive_cmd - end an explicit drive command - * @drive: command - * @stat: status bits - * @err: error bits - * - * Clean up after success/failure of an explicit drive command. - * These get thrown onto the queue so they are synchronized with - * real I/O operations on the drive. - * - * In LBA48 mode we have to read the register set twice to get - * all the extra information out. - */ - -void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) -{ - ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; - struct request *rq = hwgroup->rq; - - if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { - ide_task_t *task = (ide_task_t *)rq->special; + const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops; + struct ide_taskfile *tf = &cmd->tf; + struct request *rq = cmd->rq; + u8 tf_cmd = tf->command; - if (task) { - struct ide_taskfile *tf = &task->tf; + tf->error = err; + tf->status = stat; - tf->error = err; - tf->status = stat; + if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { + u8 data[2]; - drive->hwif->tp_ops->tf_read(drive, task); + tp_ops->input_data(drive, cmd, data, 2); - if (task->tf_flags & IDE_TFLAG_DYN) - kfree(task); - } - } else if (blk_pm_request(rq)) { - struct request_pm_state *pm = rq->data; - - ide_complete_power_step(drive, rq); - if (pm->pm_step == IDE_PM_COMPLETED) - ide_complete_pm_request(drive, rq); - return; + cmd->tf.data = data[0]; + cmd->hob.data = data[1]; } - hwgroup->rq = NULL; - - rq->errors = err; - - if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), - blk_rq_bytes(rq)))) - BUG(); -} -EXPORT_SYMBOL(ide_end_drive_cmd); - -static void ide_kill_rq(ide_drive_t *drive, struct request *rq) -{ - if (rq->rq_disk) { - ide_driver_t *drv; - - drv = *(ide_driver_t **)rq->rq_disk->private_data; - drv->end_request(drive, 0, 0); - } else - ide_end_request(drive, 0, 0); -} - -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; - } - } + ide_tf_readback(drive, cmd); - 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 ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && + tf_cmd == ATA_CMD_IDLEIMMEDIATE) { + if (tf->lbal != 0xc4) { + printk(KERN_ERR "%s: head unload failed!\n", + drive->name); + ide_tf_dump(drive->name, cmd); + } else + drive->dev_flags |= IDE_DFLAG_PARKED; } - if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) - rq->errors |= ERROR_RESET; + if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { + struct ide_cmd *orig_cmd = rq->special; - if ((rq->errors & ERROR_RESET) == ERROR_RESET) { - ++rq->errors; - return ide_do_reset(drive); + if (cmd->tf_flags & IDE_TFLAG_DYN) + kfree(orig_cmd); + else + memcpy(orig_cmd, cmd, sizeof(*cmd)); } - - if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) - drive->special.b.recalibrate = 1; - - ++rq->errors; - - return ide_stopped; } -static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) +int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes) { ide_hwif_t *hwif = drive->hwif; + struct request *rq = hwif->rq; + int rc; - 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; - } + /* + * if failfast is set on a request, override number of sectors + * and complete the whole request right now + */ + if (blk_noretry_request(rq) && error <= 0) + nr_bytes = blk_rq_sectors(rq) << 9; - return ide_stopped; -} + rc = ide_end_rq(drive, rq, error, nr_bytes); + if (rc == 0) + hwif->rq = NULL; -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); + return rc; } +EXPORT_SYMBOL(ide_complete_rq); -EXPORT_SYMBOL_GPL(__ide_error); - -/** - * 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) +void ide_kill_rq(ide_drive_t *drive, struct request *rq) { - struct request *rq; - u8 err; - - err = ide_dump_status(drive, msg, stat); + u8 drv_req = (rq->cmd_type == REQ_TYPE_SPECIAL) && rq->rq_disk; + u8 media = drive->media; - if ((rq = HWGROUP(drive)->rq) == NULL) - return ide_stopped; + drive->failed_pc = NULL; - /* retry only "normal" I/O: */ - if (!blk_fs_request(rq)) { - rq->errors = 1; - ide_end_drive_cmd(drive, stat, err); - return ide_stopped; + if ((media == ide_floppy || media == ide_tape) && drv_req) { + rq->errors = 0; + } else { + if (media == ide_tape) + rq->errors = IDE_DRV_ERROR_GENERAL; + else if (rq->cmd_type != REQ_TYPE_FS && rq->errors == 0) + rq->errors = -EIO; } - if (rq->rq_disk) { - ide_driver_t *drv; - - drv = *(ide_driver_t **)rq->rq_disk->private_data; - return drv->error(drive, rq, stat, err); - } else - return __ide_error(drive, rq, stat, err); + ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); } -EXPORT_SYMBOL_GPL(ide_error); - static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) { tf->nsect = drive->sect; @@ -364,87 +174,68 @@ static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) tf->command = ATA_CMD_SET_MULTI; } -static ide_startstop_t ide_disk_special(ide_drive_t *drive) -{ - special_t *s = &drive->special; - ide_task_t args; - - memset(&args, 0, sizeof(ide_task_t)); - args.data_phase = TASKFILE_NO_DATA; - - if (s->b.set_geometry) { - s->b.set_geometry = 0; - ide_tf_set_specify_cmd(drive, &args.tf); - } else if (s->b.recalibrate) { - s->b.recalibrate = 0; - ide_tf_set_restore_cmd(drive, &args.tf); - } else if (s->b.set_multmode) { - s->b.set_multmode = 0; - ide_tf_set_setmult_cmd(drive, &args.tf); - } else if (s->all) { - int special = s->all; - s->all = 0; - printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); - return ide_stopped; - } - - args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | - IDE_TFLAG_CUSTOM_HANDLER; - - do_rw_taskfile(drive, &args); - - return ide_started; -} - /** * do_special - issue some special commands * @drive: drive the command is for * * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. - * - * It used to do much more, but has been scaled back. */ -static ide_startstop_t do_special (ide_drive_t *drive) +static ide_startstop_t do_special(ide_drive_t *drive) { - special_t *s = &drive->special; + struct ide_cmd cmd; #ifdef DEBUG - printk("%s: do_special: 0x%02x\n", drive->name, s->all); + printk(KERN_DEBUG "%s: %s: 0x%02x\n", drive->name, __func__, + drive->special_flags); #endif - if (drive->media == ide_disk) - return ide_disk_special(drive); + if (drive->media != ide_disk) { + drive->special_flags = 0; + drive->mult_req = 0; + return ide_stopped; + } - s->all = 0; - drive->mult_req = 0; - return ide_stopped; + memset(&cmd, 0, sizeof(cmd)); + cmd.protocol = ATA_PROT_NODATA; + + if (drive->special_flags & IDE_SFLAG_SET_GEOMETRY) { + drive->special_flags &= ~IDE_SFLAG_SET_GEOMETRY; + ide_tf_set_specify_cmd(drive, &cmd.tf); + } else if (drive->special_flags & IDE_SFLAG_RECALIBRATE) { + drive->special_flags &= ~IDE_SFLAG_RECALIBRATE; + ide_tf_set_restore_cmd(drive, &cmd.tf); + } else if (drive->special_flags & IDE_SFLAG_SET_MULTMODE) { + drive->special_flags &= ~IDE_SFLAG_SET_MULTMODE; + ide_tf_set_setmult_cmd(drive, &cmd.tf); + } else + BUG(); + + cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; + cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; + cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER; + + do_rw_taskfile(drive, &cmd); + + return ide_started; } -void ide_map_sg(ide_drive_t *drive, struct request *rq) +void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) { ide_hwif_t *hwif = drive->hwif; struct scatterlist *sg = hwif->sg_table; + struct request *rq = cmd->rq; - if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { - hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); - } else { - sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); - hwif->sg_nents = 1; - } + cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); } - EXPORT_SYMBOL_GPL(ide_map_sg); -void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) +void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) { - ide_hwif_t *hwif = drive->hwif; - - hwif->nsect = hwif->nleft = rq->nr_sectors; - hwif->cursg_ofs = 0; - hwif->cursg = NULL; + cmd->nbytes = cmd->nleft = nr_bytes; + cmd->cursg_ofs = 0; + cmd->cursg = NULL; } - EXPORT_SYMBOL_GPL(ide_init_sg_cmd); /** @@ -462,24 +253,15 @@ EXPORT_SYMBOL_GPL(ide_init_sg_cmd); static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, struct request *rq) { - ide_hwif_t *hwif = HWIF(drive); - ide_task_t *task = rq->special; - - if (task) { - hwif->data_phase = task->data_phase; - - switch (hwif->data_phase) { - case TASKFILE_MULTI_OUT: - case TASKFILE_OUT: - case TASKFILE_MULTI_IN: - case TASKFILE_IN: - ide_init_sg_cmd(drive, rq); - ide_map_sg(drive, rq); - default: - break; + struct ide_cmd *cmd = rq->special; + + if (cmd) { + if (cmd->protocol == ATA_PROT_PIO) { + ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9); + ide_map_sg(drive, cmd); } - return do_rw_taskfile(drive, task); + return do_rw_taskfile(drive, cmd); } /* @@ -489,83 +271,26 @@ static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, #ifdef DEBUG printk("%s: DRIVE_CMD (null)\n", drive->name); #endif - ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), - ide_read_error(drive)); + rq->errors = 0; + ide_complete_rq(drive, 0, blk_rq_bytes(rq)); return ide_stopped; } -int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, - int arg) -{ - struct request_queue *q = drive->queue; - struct request *rq; - int ret = 0; - - if (!(setting->flags & DS_SYNC)) - return setting->set(drive, arg); - - rq = blk_get_request(q, READ, __GFP_WAIT); - rq->cmd_type = REQ_TYPE_SPECIAL; - rq->cmd_len = 5; - rq->cmd[0] = REQ_DEVSET_EXEC; - *(int *)&rq->cmd[1] = arg; - rq->special = setting->set; - - if (blk_execute_rq(q, NULL, rq, 0)) - ret = rq->errors; - blk_put_request(rq); - - return ret; -} -EXPORT_SYMBOL_GPL(ide_devset_execute); - static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) { u8 cmd = rq->cmd[0]; - if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { - ide_task_t task; - struct ide_taskfile *tf = &task.tf; - - memset(&task, 0, sizeof(task)); - if (cmd == REQ_PARK_HEADS) { - drive->sleep = *(unsigned long *)rq->special; - drive->dev_flags |= IDE_DFLAG_SLEEPING; - tf->command = ATA_CMD_IDLEIMMEDIATE; - tf->feature = 0x44; - tf->lbal = 0x4c; - tf->lbam = 0x4e; - tf->lbah = 0x55; - task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; - } else /* cmd == REQ_UNPARK_HEADS */ - tf->command = ATA_CMD_CHK_POWER; - - task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; - task.rq = rq; - drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; - return do_rw_taskfile(drive, &task); - } - switch (cmd) { + case REQ_PARK_HEADS: + case REQ_UNPARK_HEADS: + return ide_do_park_unpark(drive, rq); case REQ_DEVSET_EXEC: - { - int err, (*setfunc)(ide_drive_t *, int) = rq->special; - - err = setfunc(drive, *(int *)&rq->cmd[1]); - if (err) - rq->errors = err; - else - err = 1; - ide_end_request(drive, err, 0); - return ide_stopped; - } + return ide_do_devset(drive, rq); case REQ_DRIVE_RESET: return ide_do_reset(drive); default: - blk_dump_rq_flags(rq, "ide_special_rq - bad request"); - ide_end_request(drive, 0, 0); - return ide_stopped; + BUG(); } } @@ -582,11 +307,11 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) { ide_startstop_t startstop; - BUG_ON(!blk_rq_started(rq)); + BUG_ON(!(rq->cmd_flags & REQ_STARTED)); #ifdef DEBUG printk("%s: start_request: current=0x%08lx\n", - HWIF(drive)->name, (unsigned long) rq); + drive->hwif->name, (unsigned long) rq); #endif /* bail early if we've exceeded max_failures */ @@ -598,14 +323,15 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) if (blk_pm_request(rq)) ide_check_pm_state(drive, rq); - SELECT_DRIVE(drive); + drive->hwif->tp_ops->dev_select(drive); if (ide_wait_stat(&startstop, drive, drive->ready_stat, ATA_BUSY | ATA_DRQ, WAIT_READY)) { printk(KERN_ERR "%s: drive not ready for command\n", drive->name); return startstop; } - if (!drive->special.all) { - ide_driver_t *drv; + + if (drive->special_flags == 0) { + struct ide_driver *drv; /* * We reset the drive so we need to issue a SETFEATURES. @@ -617,7 +343,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) return execute_drive_cmd(drive, rq); else if (blk_pm_request(rq)) { - struct request_pm_state *pm = rq->data; + struct request_pm_state *pm = rq->special; #ifdef DEBUG_PM printk("%s: start_power_step(step: %d)\n", drive->name, pm->pm_step); @@ -625,9 +351,9 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) startstop = ide_start_power_step(drive, rq); if (startstop == ide_stopped && pm->pm_step == IDE_PM_COMPLETED) - ide_complete_pm_request(drive, rq); + ide_complete_pm_rq(drive, rq); return startstop; - } else if (!rq->rq_disk && blk_special_request(rq)) + } else if (!rq->rq_disk && rq->cmd_type == REQ_TYPE_SPECIAL) /* * TODO: Once all ULDs have been modified to * check for specific op codes rather than @@ -638,9 +364,9 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) */ return ide_special_rq(drive, rq); - drv = *(ide_driver_t **)rq->rq_disk->private_data; + drv = *(struct ide_driver **)rq->rq_disk->private_data; - return drv->do_request(drive, rq, rq->sector); + return drv->do_request(drive, rq, blk_rq_pos(rq)); } return do_special(drive); kill_rq: @@ -654,7 +380,7 @@ kill_rq: * @timeout: time to stall for (jiffies) * * ide_stall_queue() can be used by a drive to give excess bandwidth back - * to the hwgroup by sleeping for timeout jiffies. + * to the port by sleeping for timeout jiffies. */ void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) @@ -666,105 +392,142 @@ void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) } EXPORT_SYMBOL(ide_stall_queue); +static inline int ide_lock_port(ide_hwif_t *hwif) +{ + if (hwif->busy) + return 1; + + hwif->busy = 1; + + return 0; +} + +static inline void ide_unlock_port(ide_hwif_t *hwif) +{ + hwif->busy = 0; +} + +static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) +{ + int rc = 0; + + if (host->host_flags & IDE_HFLAG_SERIALIZE) { + rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); + if (rc == 0) { + if (host->get_lock) + host->get_lock(ide_intr, hwif); + } + } + return rc; +} + +static inline void ide_unlock_host(struct ide_host *host) +{ + if (host->host_flags & IDE_HFLAG_SERIALIZE) { + if (host->release_lock) + host->release_lock(); + clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); + } +} + +static void __ide_requeue_and_plug(struct request_queue *q, struct request *rq) +{ + if (rq) + blk_requeue_request(q, rq); + if (rq || blk_peek_request(q)) { + /* Use 3ms as that was the old plug delay */ + blk_delay_queue(q, 3); + } +} + +void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq) +{ + struct request_queue *q = drive->queue; + unsigned long flags; + + spin_lock_irqsave(q->queue_lock, flags); + __ide_requeue_and_plug(q, rq); + spin_unlock_irqrestore(q->queue_lock, flags); +} + /* - * Issue a new request to a drive from hwgroup - * - * A hwgroup is a serialized group of IDE interfaces. Usually there is - * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) - * may have both interfaces in a single hwgroup to "serialize" access. - * Or possibly multiple ISA interfaces can share a common IRQ by being grouped - * together into one hwgroup for serialized access. - * - * Note also that several hwgroups can end up sharing a single IRQ, - * possibly along with many other devices. This is especially common in - * PCI-based systems with off-board IDE controller cards. - * - * The IDE driver uses a per-hwgroup lock to protect the hwgroup->busy flag. - * - * The first thread into the driver for a particular hwgroup sets the - * hwgroup->busy flag to indicate that this hwgroup is now active, - * and then initiates processing of the top request from the request queue. - * - * Other threads attempting entry notice the busy setting, and will simply - * queue their new requests and exit immediately. Note that hwgroup->busy - * remains set even when the driver is merely awaiting the next interrupt. - * Thus, the meaning is "this hwgroup is busy processing a request". - * - * When processing of a request completes, the completing thread or IRQ-handler - * will start the next request from the queue. If no more work remains, - * the driver will clear the hwgroup->busy flag and exit. - * - * The per-hwgroup spinlock is used to protect all access to the - * hwgroup->busy flag, but is otherwise not needed for most processing in - * the driver. This makes the driver much more friendlier to shared IRQs - * than previous designs, while remaining 100% (?) SMP safe and capable. + * Issue a new request to a device. */ void do_ide_request(struct request_queue *q) { ide_drive_t *drive = q->queuedata; ide_hwif_t *hwif = drive->hwif; - ide_hwgroup_t *hwgroup = hwif->hwgroup; - struct request *rq; + struct ide_host *host = hwif->host; + struct request *rq = NULL; ide_startstop_t startstop; - - /* - * drive is doing pre-flush, ordered write, post-flush sequence. even - * though that is 3 requests, it must be seen as a single transaction. - * we must not preempt this drive until that is complete - */ - if (blk_queue_flushing(q)) - /* - * small race where queue could get replugged during - * the 3-request flush cycle, just yank the plug since - * we want it to finish asap - */ - blk_remove_plug(q); + unsigned long queue_run_ms = 3; /* old plug delay */ spin_unlock_irq(q->queue_lock); - spin_lock_irq(&hwgroup->lock); - if (!ide_lock_hwgroup(hwgroup)) { + /* HLD do_request() callback might sleep, make sure it's okay */ + might_sleep(); + + if (ide_lock_host(host, hwif)) + goto plug_device_2; + + spin_lock_irq(&hwif->lock); + + if (!ide_lock_port(hwif)) { + ide_hwif_t *prev_port; + + WARN_ON_ONCE(hwif->rq); repeat: - hwgroup->rq = NULL; + prev_port = hwif->host->cur_port; + if (drive->dev_flags & IDE_DFLAG_SLEEPING && + time_after(drive->sleep, jiffies)) { + unsigned long left = jiffies - drive->sleep; - if (drive->dev_flags & IDE_DFLAG_SLEEPING) { - if (time_before(drive->sleep, jiffies)) { - ide_unlock_hwgroup(hwgroup); - goto plug_device; - } + queue_run_ms = jiffies_to_msecs(left + 1); + ide_unlock_port(hwif); + goto plug_device; } - if (hwif != hwgroup->hwif) { + if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && + hwif != prev_port) { + ide_drive_t *cur_dev = + prev_port ? prev_port->cur_dev : NULL; + /* - * set nIEN for previous hwif, drives in the - * quirk_list may not like intr setups/cleanups + * set nIEN for previous port, drives in the + * quirk list may not like intr setups/cleanups */ - if (drive->quirk_list == 0) - hwif->tp_ops->set_irq(hwif, 0); + if (cur_dev && + (cur_dev->dev_flags & IDE_DFLAG_NIEN_QUIRK) == 0) + prev_port->tp_ops->write_devctl(prev_port, + ATA_NIEN | + ATA_DEVCTL_OBS); + + hwif->host->cur_port = hwif; } - hwgroup->hwif = hwif; - hwgroup->drive = drive; + hwif->cur_dev = drive; drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); - spin_unlock_irq(&hwgroup->lock); + spin_unlock_irq(&hwif->lock); spin_lock_irq(q->queue_lock); /* * we know that the queue isn't empty, but this can happen * if the q->prep_rq_fn() decides to kill a request */ - rq = elv_next_request(drive->queue); + if (!rq) + rq = blk_fetch_request(drive->queue); + spin_unlock_irq(q->queue_lock); - spin_lock_irq(&hwgroup->lock); + spin_lock_irq(&hwif->lock); if (!rq) { - ide_unlock_hwgroup(hwgroup); + ide_unlock_port(hwif); goto out; } /* * Sanity: don't accept a request that isn't a PM request * if we are currently power managed. This is very important as - * blk_stop_queue() doesn't prevent the elv_next_request() + * blk_stop_queue() doesn't prevent the blk_fetch_request() * above to return us whatever is in the queue. Since we call * ide_do_request() ourselves, we end up taking requests while * the queue is blocked... @@ -778,105 +541,64 @@ repeat: blk_pm_request(rq) == 0 && (rq->cmd_flags & REQ_PREEMPT) == 0) { /* there should be no pending command at this point */ - ide_unlock_hwgroup(hwgroup); + ide_unlock_port(hwif); goto plug_device; } - hwgroup->rq = rq; + hwif->rq = rq; - spin_unlock_irq(&hwgroup->lock); + spin_unlock_irq(&hwif->lock); startstop = start_request(drive, rq); - spin_lock_irq(&hwgroup->lock); + spin_lock_irq(&hwif->lock); - if (startstop == ide_stopped) + if (startstop == ide_stopped) { + rq = hwif->rq; + hwif->rq = NULL; goto repeat; + } } else goto plug_device; out: - spin_unlock_irq(&hwgroup->lock); + spin_unlock_irq(&hwif->lock); + if (rq == NULL) + ide_unlock_host(host); spin_lock_irq(q->queue_lock); return; plug_device: - spin_unlock_irq(&hwgroup->lock); + spin_unlock_irq(&hwif->lock); + ide_unlock_host(host); +plug_device_2: spin_lock_irq(q->queue_lock); - - if (!elv_queue_empty(q)) - blk_plug_device(q); + __ide_requeue_and_plug(q, rq); } -/* - * un-busy the hwgroup etc, and clear any pending DMA status. we want to - * retry the current request in pio mode instead of risking tossing it - * all away - */ -static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) +static int drive_is_ready(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct request *rq; - ide_startstop_t ret = ide_stopped; - - /* - * end current dma transaction - */ - - if (error < 0) { - printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); - (void)hwif->dma_ops->dma_end(drive); - ret = ide_error(drive, "dma timeout error", - hwif->tp_ops->read_status(hwif)); - } else { - printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); - hwif->dma_ops->dma_timeout(drive); - } - - /* - * disable dma for now, but remember that we did so because of - * a timeout -- we'll reenable after we finish this next request - * (or rather the first chunk of it) in pio. - */ - drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; - drive->retry_pio++; - ide_dma_off_quietly(drive); - - /* - * un-busy drive etc (hwgroup->busy is cleared on return) and - * make sure request is sane - */ - rq = HWGROUP(drive)->rq; - - if (!rq) - goto out; - - HWGROUP(drive)->rq = NULL; - - rq->errors = 0; + ide_hwif_t *hwif = drive->hwif; + u8 stat = 0; - if (!rq->bio) - goto out; + if (drive->waiting_for_dma) + return hwif->dma_ops->dma_test_irq(drive); - rq->sector = rq->bio->bi_sector; - rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; - rq->hard_cur_sectors = rq->current_nr_sectors; - rq->buffer = bio_data(rq->bio); -out: - return ret; -} + if (hwif->io_ports.ctl_addr && + (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) + stat = hwif->tp_ops->read_altstatus(hwif); + else + /* Note: this may clear a pending IRQ!! */ + stat = hwif->tp_ops->read_status(hwif); -static void ide_plug_device(ide_drive_t *drive) -{ - struct request_queue *q = drive->queue; - unsigned long flags; + if (stat & ATA_BUSY) + /* drive busy: definitely not interrupting */ + return 0; - spin_lock_irqsave(q->queue_lock, flags); - if (!elv_queue_empty(q)) - blk_plug_device(q); - spin_unlock_irqrestore(q->queue_lock, flags); + /* drive ready: *might* be interrupting */ + return 1; } /** * ide_timer_expiry - handle lack of an IDE interrupt - * @data: timer callback magic (hwgroup) + * @data: timer callback magic (hwif) * * An IDE command has timed out before the expected drive return * occurred. At this point we attempt to clean up the current @@ -890,18 +612,19 @@ static void ide_plug_device(ide_drive_t *drive) void ide_timer_expiry (unsigned long data) { - ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; + ide_hwif_t *hwif = (ide_hwif_t *)data; ide_drive_t *uninitialized_var(drive); ide_handler_t *handler; - ide_expiry_t *expiry; unsigned long flags; - unsigned long wait = -1; + int wait = -1; int plug_device = 0; + struct request *uninitialized_var(rq_in_flight); + + spin_lock_irqsave(&hwif->lock, flags); - spin_lock_irqsave(&hwgroup->lock, flags); + handler = hwif->handler; - if (((handler = hwgroup->handler) == NULL) || - (hwgroup->req_gen != hwgroup->req_gen_timer)) { + if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { /* * Either a marginal timeout occurred * (got the interrupt just as timer expired), @@ -909,72 +632,73 @@ void ide_timer_expiry (unsigned long data) * Either way, we don't really want to complain about anything. */ } else { - drive = hwgroup->drive; - if (!drive) { - printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); - hwgroup->handler = NULL; - } else { - ide_hwif_t *hwif; - ide_startstop_t startstop = ide_stopped; - - if ((expiry = hwgroup->expiry) != NULL) { - /* continue */ - if ((wait = expiry(drive)) > 0) { - /* reset timer */ - hwgroup->timer.expires = jiffies + wait; - hwgroup->req_gen_timer = hwgroup->req_gen; - add_timer(&hwgroup->timer); - spin_unlock_irqrestore(&hwgroup->lock, flags); - return; - } - } - hwgroup->handler = NULL; - /* - * We need to simulate a real interrupt when invoking - * the handler() function, which means we need to - * globally mask the specific IRQ: - */ - spin_unlock(&hwgroup->lock); - hwif = HWIF(drive); - /* disable_irq_nosync ?? */ - disable_irq(hwif->irq); - /* local CPU only, - * as if we were handling an interrupt */ - local_irq_disable(); - if (hwgroup->polling) { - startstop = handler(drive); - } else if (drive_is_ready(drive)) { - if (drive->waiting_for_dma) - hwif->dma_ops->dma_lost_irq(drive); - (void)ide_ack_intr(hwif); - printk(KERN_WARNING "%s: lost interrupt\n", drive->name); - startstop = handler(drive); - } else { - if (drive->waiting_for_dma) { - startstop = ide_dma_timeout_retry(drive, wait); - } else - startstop = - ide_error(drive, "irq timeout", - hwif->tp_ops->read_status(hwif)); - } - spin_lock_irq(&hwgroup->lock); - enable_irq(hwif->irq); - if (startstop == ide_stopped) { - ide_unlock_hwgroup(hwgroup); - plug_device = 1; + ide_expiry_t *expiry = hwif->expiry; + ide_startstop_t startstop = ide_stopped; + + drive = hwif->cur_dev; + + if (expiry) { + wait = expiry(drive); + if (wait > 0) { /* continue */ + /* reset timer */ + hwif->timer.expires = jiffies + wait; + hwif->req_gen_timer = hwif->req_gen; + add_timer(&hwif->timer); + spin_unlock_irqrestore(&hwif->lock, flags); + return; } } + hwif->handler = NULL; + hwif->expiry = NULL; + /* + * We need to simulate a real interrupt when invoking + * the handler() function, which means we need to + * globally mask the specific IRQ: + */ + spin_unlock(&hwif->lock); + /* disable_irq_nosync ?? */ + disable_irq(hwif->irq); + /* local CPU only, as if we were handling an interrupt */ + local_irq_disable(); + if (hwif->polling) { + startstop = handler(drive); + } else if (drive_is_ready(drive)) { + if (drive->waiting_for_dma) + hwif->dma_ops->dma_lost_irq(drive); + if (hwif->port_ops && hwif->port_ops->clear_irq) + hwif->port_ops->clear_irq(drive); + + printk(KERN_WARNING "%s: lost interrupt\n", + drive->name); + startstop = handler(drive); + } else { + if (drive->waiting_for_dma) + startstop = ide_dma_timeout_retry(drive, wait); + else + startstop = ide_error(drive, "irq timeout", + hwif->tp_ops->read_status(hwif)); + } + spin_lock_irq(&hwif->lock); + enable_irq(hwif->irq); + if (startstop == ide_stopped && hwif->polling == 0) { + rq_in_flight = hwif->rq; + hwif->rq = NULL; + ide_unlock_port(hwif); + plug_device = 1; + } } - spin_unlock_irqrestore(&hwgroup->lock, flags); + spin_unlock_irqrestore(&hwif->lock, flags); - if (plug_device) - ide_plug_device(drive); + if (plug_device) { + ide_unlock_host(hwif->host); + ide_requeue_and_plug(drive, rq_in_flight); + } } /** * unexpected_intr - handle an unexpected IDE interrupt * @irq: interrupt line - * @hwgroup: hwgroup being processed + * @hwif: port being processed * * There's nothing really useful we can do with an unexpected interrupt, * other than reading the status register (to clear it), and logging it. @@ -998,52 +722,38 @@ void ide_timer_expiry (unsigned long data) * before completing the issuance of any new drive command, so we will not * be accidentally invoked as a result of any valid command completion * interrupt. - * - * Note that we must walk the entire hwgroup here. We know which hwif - * is doing the current command, but we don't know which hwif burped - * mysteriously. */ - -static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) -{ - u8 stat; - ide_hwif_t *hwif = hwgroup->hwif; - /* - * handle the unexpected interrupt - */ - do { - if (hwif->irq == irq) { - stat = hwif->tp_ops->read_status(hwif); - - if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { - /* Try to not flood the console with msgs */ - static unsigned long last_msgtime, count; - ++count; - if (time_after(jiffies, last_msgtime + HZ)) { - last_msgtime = jiffies; - printk(KERN_ERR "%s%s: unexpected interrupt, " - "status=0x%02x, count=%ld\n", - hwif->name, - (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); - } - } +static void unexpected_intr(int irq, ide_hwif_t *hwif) +{ + u8 stat = hwif->tp_ops->read_status(hwif); + + if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { + /* Try to not flood the console with msgs */ + static unsigned long last_msgtime, count; + ++count; + + if (time_after(jiffies, last_msgtime + HZ)) { + last_msgtime = jiffies; + printk(KERN_ERR "%s: unexpected interrupt, " + "status=0x%02x, count=%ld\n", + hwif->name, stat, count); } - } while ((hwif = hwif->next) != hwgroup->hwif); + } } /** * ide_intr - default IDE interrupt handler * @irq: interrupt number - * @dev_id: hwif group + * @dev_id: hwif * @regs: unused weirdness from the kernel irq layer * * This is the default IRQ handler for the IDE layer. You should * not need to override it. If you do be aware it is subtle in * places * - * hwgroup->hwif is the interface in the group currently performing - * a command. hwgroup->drive is the drive and hwgroup->handler is + * hwif is the interface in the group currently performing + * a command. hwif->cur_dev is the drive and hwif->handler is * the IRQ handler to call. As we issue a command the handlers * step through multiple states, reassigning the handler to the * next step in the process. Unlike a smart SCSI controller IDE @@ -1054,26 +764,35 @@ static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) * * The handler eventually returns ide_stopped to indicate the * request completed. At this point we issue the next request - * on the hwgroup and the process begins again. + * on the port and the process begins again. */ - + irqreturn_t ide_intr (int irq, void *dev_id) { - unsigned long flags; - ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; - ide_hwif_t *hwif = hwgroup->hwif; + ide_hwif_t *hwif = (ide_hwif_t *)dev_id; + struct ide_host *host = hwif->host; ide_drive_t *uninitialized_var(drive); ide_handler_t *handler; + unsigned long flags; ide_startstop_t startstop; irqreturn_t irq_ret = IRQ_NONE; int plug_device = 0; + struct request *uninitialized_var(rq_in_flight); - spin_lock_irqsave(&hwgroup->lock, flags); + if (host->host_flags & IDE_HFLAG_SERIALIZE) { + if (hwif != host->cur_port) + goto out_early; + } - if (!ide_ack_intr(hwif)) + spin_lock_irqsave(&hwif->lock, flags); + + if (hwif->port_ops && hwif->port_ops->test_irq && + hwif->port_ops->test_irq(hwif) == 0) goto out; - if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { + handler = hwif->handler; + + if (handler == NULL || hwif->polling) { /* * Not expecting an interrupt from this drive. * That means this could be: @@ -1085,41 +804,24 @@ irqreturn_t ide_intr (int irq, void *dev_id) * * For PCI, we cannot tell the difference, * so in that case we just ignore it and hope it goes away. - * - * FIXME: unexpected_intr should be hwif-> then we can - * remove all the ifdef PCI crap */ -#ifdef CONFIG_BLK_DEV_IDEPCI - if (hwif->chipset != ide_pci) -#endif /* CONFIG_BLK_DEV_IDEPCI */ - { + if ((host->irq_flags & IRQF_SHARED) == 0) { /* * Probably not a shared PCI interrupt, * so we can safely try to do something about it: */ - unexpected_intr(irq, hwgroup); -#ifdef CONFIG_BLK_DEV_IDEPCI + unexpected_intr(irq, hwif); } else { /* * Whack the status register, just in case * we have a leftover pending IRQ. */ (void)hwif->tp_ops->read_status(hwif); -#endif /* CONFIG_BLK_DEV_IDEPCI */ } goto out; } - drive = hwgroup->drive; - if (!drive) { - /* - * This should NEVER happen, and there isn't much - * we could do about it here. - * - * [Note - this can occur if the drive is hot unplugged] - */ - goto out_handled; - } + drive = hwif->cur_dev; if (!drive_is_ready(drive)) /* @@ -1131,10 +833,11 @@ irqreturn_t ide_intr (int irq, void *dev_id) */ goto out; - hwgroup->handler = NULL; - hwgroup->req_gen++; - del_timer(&hwgroup->timer); - spin_unlock(&hwgroup->lock); + hwif->handler = NULL; + hwif->expiry = NULL; + hwif->req_gen++; + del_timer(&hwif->timer); + spin_unlock(&hwif->lock); if (hwif->port_ops && hwif->port_ops->clear_irq) hwif->port_ops->clear_irq(drive); @@ -1145,7 +848,7 @@ irqreturn_t ide_intr (int irq, void *dev_id) /* service this interrupt, may set handler for next interrupt */ startstop = handler(drive); - spin_lock_irq(&hwgroup->lock); + spin_lock_irq(&hwif->lock); /* * Note that handler() may have set things up for another * interrupt to occur soon, but it cannot happen until @@ -1153,74 +856,25 @@ irqreturn_t ide_intr (int irq, void *dev_id) * same irq as is currently being serviced here, and Linux * won't allow another of the same (on any CPU) until we return. */ - if (startstop == ide_stopped) { - if (hwgroup->handler == NULL) { /* paranoia */ - ide_unlock_hwgroup(hwgroup); - plug_device = 1; - } else - printk(KERN_ERR "%s: %s: huh? expected NULL handler " - "on exit\n", __func__, drive->name); + if (startstop == ide_stopped && hwif->polling == 0) { + BUG_ON(hwif->handler); + rq_in_flight = hwif->rq; + hwif->rq = NULL; + ide_unlock_port(hwif); + plug_device = 1; } -out_handled: irq_ret = IRQ_HANDLED; out: - spin_unlock_irqrestore(&hwgroup->lock, flags); - - if (plug_device) - ide_plug_device(drive); + spin_unlock_irqrestore(&hwif->lock, flags); +out_early: + if (plug_device) { + ide_unlock_host(hwif->host); + ide_requeue_and_plug(drive, rq_in_flight); + } return irq_ret; } - -/** - * ide_do_drive_cmd - issue IDE special command - * @drive: device to issue command - * @rq: request to issue - * - * This function issues a special IDE device request - * onto the request queue. - * - * the rq is queued at the head of the request queue, displacing - * the currently-being-processed request and this function - * returns immediately without waiting for the new rq to be - * completed. This is VERY DANGEROUS, and is intended for - * careful use by the ATAPI tape/cdrom driver code. - */ - -void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) -{ - ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; - struct request_queue *q = drive->queue; - unsigned long flags; - - hwgroup->rq = NULL; - - spin_lock_irqsave(q->queue_lock, flags); - __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); - blk_start_queueing(q); - spin_unlock_irqrestore(q->queue_lock, flags); -} -EXPORT_SYMBOL(ide_do_drive_cmd); - -void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) -{ - ide_hwif_t *hwif = drive->hwif; - ide_task_t task; - - memset(&task, 0, sizeof(task)); - task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | - IDE_TFLAG_OUT_FEATURE | tf_flags; - task.tf.feature = dma; /* Use PIO/DMA */ - task.tf.lbam = bcount & 0xff; - task.tf.lbah = (bcount >> 8) & 0xff; - - ide_tf_dump(drive->name, &task.tf); - hwif->tp_ops->set_irq(hwif, 1); - SELECT_MASK(drive, 0); - hwif->tp_ops->tf_load(drive, &task); -} - -EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); +EXPORT_SYMBOL_GPL(ide_intr); void ide_pad_transfer(ide_drive_t *drive, int write, int len) { |