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261 lines
6.8 KiB
261 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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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{ |
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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)) { |
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/* call ACPI _GTM only once */ |
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if ((drive->dn & 1) == 0 || pair == NULL) |
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ide_acpi_get_timing(hwif); |
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} |
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memset(&rqpm, 0, sizeof(rqpm)); |
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rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0); |
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ide_req(rq)->type = ATA_PRIV_PM_SUSPEND; |
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ide_req(rq)->special = &rqpm; |
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rqpm.pm_step = IDE_PM_START_SUSPEND; |
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if (mesg.event == PM_EVENT_PRETHAW) |
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mesg.event = PM_EVENT_FREEZE; |
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rqpm.pm_state = mesg.event; |
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blk_execute_rq(NULL, rq, 0); |
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ret = scsi_req(rq)->result ? -EIO : 0; |
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blk_put_request(rq); |
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if (ret == 0 && ide_port_acpi(hwif)) { |
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/* call ACPI _PS3 only after both devices are suspended */ |
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if ((drive->dn & 1) || pair == NULL) |
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ide_acpi_set_state(hwif, 0); |
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} |
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return ret; |
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} |
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static int ide_pm_execute_rq(struct request *rq) |
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{ |
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struct request_queue *q = rq->q; |
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if (unlikely(blk_queue_dying(q))) { |
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rq->rq_flags |= RQF_QUIET; |
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scsi_req(rq)->result = -ENXIO; |
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blk_mq_end_request(rq, BLK_STS_OK); |
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return -ENXIO; |
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} |
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blk_execute_rq(NULL, rq, true); |
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return scsi_req(rq)->result ? -EIO : 0; |
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} |
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int generic_ide_resume(struct device *dev) |
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{ |
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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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blk_mq_start_stopped_hw_queues(drive->queue, true); |
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if (ide_port_acpi(hwif)) { |
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/* call ACPI _PS0 / _STM only once */ |
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if ((drive->dn & 1) == 0 || pair == NULL) { |
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ide_acpi_set_state(hwif, 1); |
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ide_acpi_push_timing(hwif); |
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} |
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ide_acpi_exec_tfs(drive); |
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} |
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memset(&rqpm, 0, sizeof(rqpm)); |
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rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_PM); |
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ide_req(rq)->type = ATA_PRIV_PM_RESUME; |
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ide_req(rq)->special = &rqpm; |
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rqpm.pm_step = IDE_PM_START_RESUME; |
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rqpm.pm_state = PM_EVENT_ON; |
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err = ide_pm_execute_rq(rq); |
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blk_put_request(rq); |
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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) |
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drv->resume(drive); |
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} |
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return err; |
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} |
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void ide_complete_power_step(ide_drive_t *drive, struct request *rq) |
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{ |
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struct ide_pm_state *pm = ide_req(rq)->special; |
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#ifdef DEBUG_PM |
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printk(KERN_INFO "%s: complete_power_step(step: %d)\n", |
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drive->name, pm->pm_step); |
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#endif |
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if (drive->media != ide_disk) |
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return; |
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switch (pm->pm_step) { |
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case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
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if (pm->pm_state == PM_EVENT_FREEZE) |
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pm->pm_step = IDE_PM_COMPLETED; |
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else |
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pm->pm_step = IDE_PM_STANDBY; |
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break; |
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case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
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pm->pm_step = IDE_PM_COMPLETED; |
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break; |
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case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
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pm->pm_step = IDE_PM_IDLE; |
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break; |
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case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
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pm->pm_step = IDE_PM_RESTORE_DMA; |
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break; |
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} |
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} |
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ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) |
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{ |
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struct ide_pm_state *pm = ide_req(rq)->special; |
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struct ide_cmd cmd = { }; |
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switch (pm->pm_step) { |
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case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
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if (drive->media != ide_disk) |
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break; |
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/* Not supported? Switch to next step now. */ |
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if (ata_id_flush_enabled(drive->id) == 0 || |
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(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { |
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ide_complete_power_step(drive, rq); |
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return ide_stopped; |
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} |
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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; |
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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; |
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case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
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ide_set_max_pio(drive); |
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/* |
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* skip IDE_PM_IDLE for ATAPI devices |
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*/ |
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if (drive->media != ide_disk) |
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pm->pm_step = IDE_PM_RESTORE_DMA; |
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else |
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ide_complete_power_step(drive, rq); |
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return ide_stopped; |
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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; |
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case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
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/* |
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* Right now, all we do is call ide_set_dma(drive), |
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* we could be smarter and check for current xfer_speed |
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* in struct drive etc... |
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*/ |
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if (drive->hwif->dma_ops == NULL) |
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break; |
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/* |
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* TODO: respect IDE_DFLAG_USING_DMA |
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*/ |
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ide_set_dma(drive); |
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break; |
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} |
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pm->pm_step = IDE_PM_COMPLETED; |
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return ide_stopped; |
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out_do_tf: |
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cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; |
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cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; |
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cmd.protocol = ATA_PROT_NODATA; |
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return do_rw_taskfile(drive, &cmd); |
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} |
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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 |
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* @rq: request |
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* |
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* This function cleans up the current PM request and stops the queue |
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* if necessary. |
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*/ |
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void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq) |
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{ |
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struct request_queue *q = drive->queue; |
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struct ide_pm_state *pm = ide_req(rq)->special; |
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ide_complete_power_step(drive, rq); |
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if (pm->pm_step != IDE_PM_COMPLETED) |
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return; |
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#ifdef DEBUG_PM |
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printk("%s: completing PM request, %s\n", drive->name, |
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(ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume"); |
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#endif |
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if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) |
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blk_mq_stop_hw_queues(q); |
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else |
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drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
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drive->hwif->rq = NULL; |
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blk_mq_end_request(rq, BLK_STS_OK); |
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} |
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void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
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{ |
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struct ide_pm_state *pm = ide_req(rq)->special; |
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if (blk_rq_is_private(rq) && |
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ide_req(rq)->type == ATA_PRIV_PM_SUSPEND && |
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pm->pm_step == IDE_PM_START_SUSPEND) |
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/* Mark drive blocked when starting the suspend sequence. */ |
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drive->dev_flags |= IDE_DFLAG_BLOCKED; |
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else if (blk_rq_is_private(rq) && |
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ide_req(rq)->type == ATA_PRIV_PM_RESUME && |
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pm->pm_step == IDE_PM_START_RESUME) { |
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/* |
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* The first thing we do on wakeup is to wait for BSY bit to |
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* go away (with a looong timeout) as a drive on this hwif may |
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* just be POSTing itself. |
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* We do that before even selecting as the "other" device on |
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* the bus may be broken enough to walk on our toes at this |
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* point. |
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*/ |
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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; |
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int rc; |
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#ifdef DEBUG_PM |
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printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); |
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#endif |
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rc = ide_wait_not_busy(hwif, 35000); |
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if (rc) |
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printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); |
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tp_ops->dev_select(drive); |
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tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); |
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rc = ide_wait_not_busy(hwif, 100000); |
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if (rc) |
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printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); |
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blk_mq_start_hw_queues(q); |
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} |
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}
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