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drivers/ide/ide-pm.c
7.16 KB
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#include <linux/kernel.h> |
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#include <linux/gfp.h> |
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#include <linux/ide.h> |
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int generic_ide_suspend(struct device *dev, pm_message_t mesg) { |
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ide_drive_t *drive = to_ide_device(dev); |
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ide_drive_t *pair = ide_get_pair_dev(drive); |
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ide_hwif_t *hwif = drive->hwif; |
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struct request *rq; |
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struct ide_pm_state rqpm; |
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int ret; |
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if (ide_port_acpi(hwif)) { /* call ACPI _GTM only once */ if ((drive->dn & 1) == 0 || pair == NULL) ide_acpi_get_timing(hwif); } |
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memset(&rqpm, 0, sizeof(rqpm)); |
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rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM); |
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rq->cmd_type = REQ_TYPE_ATA_PM_SUSPEND; |
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rq->special = &rqpm; |
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rqpm.pm_step = IDE_PM_START_SUSPEND; if (mesg.event == PM_EVENT_PRETHAW) mesg.event = PM_EVENT_FREEZE; rqpm.pm_state = mesg.event; ret = blk_execute_rq(drive->queue, NULL, rq, 0); blk_put_request(rq); |
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if (ret == 0 && ide_port_acpi(hwif)) { /* call ACPI _PS3 only after both devices are suspended */ if ((drive->dn & 1) || pair == NULL) ide_acpi_set_state(hwif, 0); } |
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return ret; } |
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static void ide_end_sync_rq(struct request *rq, int error) { complete(rq->end_io_data); } static int ide_pm_execute_rq(struct request *rq) { struct request_queue *q = rq->q; DECLARE_COMPLETION_ONSTACK(wait); rq->end_io_data = &wait; rq->end_io = ide_end_sync_rq; spin_lock_irq(q->queue_lock); if (unlikely(blk_queue_dying(q))) { rq->cmd_flags |= REQ_QUIET; rq->errors = -ENXIO; __blk_end_request_all(rq, rq->errors); spin_unlock_irq(q->queue_lock); return -ENXIO; } __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT); __blk_run_queue_uncond(q); spin_unlock_irq(q->queue_lock); wait_for_completion_io(&wait); return rq->errors ? -EIO : 0; } |
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int generic_ide_resume(struct device *dev) { |
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ide_drive_t *drive = to_ide_device(dev); |
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ide_drive_t *pair = ide_get_pair_dev(drive); |
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ide_hwif_t *hwif = drive->hwif; |
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struct request *rq; |
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struct ide_pm_state rqpm; |
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int err; |
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if (ide_port_acpi(hwif)) { /* call ACPI _PS0 / _STM only once */ if ((drive->dn & 1) == 0 || pair == NULL) { ide_acpi_set_state(hwif, 1); ide_acpi_push_timing(hwif); } |
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ide_acpi_exec_tfs(drive); } |
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memset(&rqpm, 0, sizeof(rqpm)); |
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rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM); |
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rq->cmd_type = REQ_TYPE_ATA_PM_RESUME; |
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rq->cmd_flags |= REQ_PREEMPT; |
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rq->special = &rqpm; |
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rqpm.pm_step = IDE_PM_START_RESUME; rqpm.pm_state = PM_EVENT_ON; |
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err = ide_pm_execute_rq(rq); |
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blk_put_request(rq); if (err == 0 && dev->driver) { |
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struct ide_driver *drv = to_ide_driver(dev->driver); |
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if (drv->resume) drv->resume(drive); } return err; } void ide_complete_power_step(ide_drive_t *drive, struct request *rq) { |
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struct ide_pm_state *pm = rq->special; |
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#ifdef DEBUG_PM printk(KERN_INFO "%s: complete_power_step(step: %d) ", drive->name, pm->pm_step); #endif if (drive->media != ide_disk) return; switch (pm->pm_step) { case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ if (pm->pm_state == PM_EVENT_FREEZE) pm->pm_step = IDE_PM_COMPLETED; else pm->pm_step = IDE_PM_STANDBY; break; case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ pm->pm_step = IDE_PM_COMPLETED; break; case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ pm->pm_step = IDE_PM_IDLE; break; case IDE_PM_IDLE: /* Resume step 2 (idle)*/ pm->pm_step = IDE_PM_RESTORE_DMA; break; } } ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) { |
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struct ide_pm_state *pm = rq->special; |
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struct ide_cmd cmd = { }; |
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switch (pm->pm_step) { case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ if (drive->media != ide_disk) break; /* Not supported? Switch to next step now. */ if (ata_id_flush_enabled(drive->id) == 0 || (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { ide_complete_power_step(drive, rq); return ide_stopped; } if (ata_id_flush_ext_enabled(drive->id)) |
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cmd.tf.command = ATA_CMD_FLUSH_EXT; |
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else |
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cmd.tf.command = ATA_CMD_FLUSH; |
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goto out_do_tf; case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
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cmd.tf.command = ATA_CMD_STANDBYNOW1; |
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goto out_do_tf; case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ ide_set_max_pio(drive); /* * skip IDE_PM_IDLE for ATAPI devices */ if (drive->media != ide_disk) pm->pm_step = IDE_PM_RESTORE_DMA; else ide_complete_power_step(drive, rq); return ide_stopped; case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
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cmd.tf.command = ATA_CMD_IDLEIMMEDIATE; |
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goto out_do_tf; case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ /* * Right now, all we do is call ide_set_dma(drive), * we could be smarter and check for current xfer_speed * in struct drive etc... */ if (drive->hwif->dma_ops == NULL) break; /* * TODO: respect IDE_DFLAG_USING_DMA */ ide_set_dma(drive); break; } pm->pm_step = IDE_PM_COMPLETED; |
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return ide_stopped; out_do_tf: |
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cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; cmd.protocol = ATA_PROT_NODATA; |
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return do_rw_taskfile(drive, &cmd); |
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} /** |
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* ide_complete_pm_rq - end the current Power Management request |
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* @drive: target drive * @rq: request * * This function cleans up the current PM request and stops the queue * if necessary. */ |
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void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq) |
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{ struct request_queue *q = drive->queue; |
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struct ide_pm_state *pm = rq->special; |
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unsigned long flags; |
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ide_complete_power_step(drive, rq); if (pm->pm_step != IDE_PM_COMPLETED) return; |
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#ifdef DEBUG_PM printk("%s: completing PM request, %s ", drive->name, |
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(rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) ? "suspend" : "resume"); |
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#endif spin_lock_irqsave(q->queue_lock, flags); |
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if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND) |
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blk_stop_queue(q); |
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else |
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drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
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spin_unlock_irqrestore(q->queue_lock, flags); |
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drive->hwif->rq = NULL; |
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if (blk_end_request(rq, 0, 0)) BUG(); } void ide_check_pm_state(ide_drive_t *drive, struct request *rq) { |
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struct ide_pm_state *pm = rq->special; |
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if (rq->cmd_type == REQ_TYPE_ATA_PM_SUSPEND && |
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pm->pm_step == IDE_PM_START_SUSPEND) /* Mark drive blocked when starting the suspend sequence. */ drive->dev_flags |= IDE_DFLAG_BLOCKED; |
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else if (rq->cmd_type == REQ_TYPE_ATA_PM_RESUME && |
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pm->pm_step == IDE_PM_START_RESUME) { /* * The first thing we do on wakeup is to wait for BSY bit to * go away (with a looong timeout) as a drive on this hwif may * just be POSTing itself. * We do that before even selecting as the "other" device on * the bus may be broken enough to walk on our toes at this * point. */ ide_hwif_t *hwif = drive->hwif; |
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const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
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struct request_queue *q = drive->queue; unsigned long flags; |
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int rc; #ifdef DEBUG_PM printk("%s: Wakeup request inited, waiting for !BSY... ", drive->name); #endif rc = ide_wait_not_busy(hwif, 35000); if (rc) printk(KERN_WARNING "%s: bus not ready on wakeup ", drive->name); |
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tp_ops->dev_select(drive); tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); |
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rc = ide_wait_not_busy(hwif, 100000); if (rc) printk(KERN_WARNING "%s: drive not ready on wakeup ", drive->name); |
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spin_lock_irqsave(q->queue_lock, flags); blk_start_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); |
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} } |