diff options
Diffstat (limited to 'drivers/ide/ide-park.c')
| -rw-r--r-- | drivers/ide/ide-park.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c new file mode 100644 index 000000000..8af7af600 --- /dev/null +++ b/drivers/ide/ide-park.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/gfp.h> +#include <linux/ide.h> +#include <linux/jiffies.h> +#include <linux/blkdev.h> + +DECLARE_WAIT_QUEUE_HEAD(ide_park_wq); + +static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout) +{ + ide_hwif_t *hwif = drive->hwif; + struct request_queue *q = drive->queue; + struct request *rq; + int rc; + + timeout += jiffies; + spin_lock_irq(&hwif->lock); + if (drive->dev_flags & IDE_DFLAG_PARKED) { + int reset_timer = time_before(timeout, drive->sleep); + int start_queue = 0; + + drive->sleep = timeout; + wake_up_all(&ide_park_wq); + if (reset_timer && del_timer(&hwif->timer)) + start_queue = 1; + spin_unlock_irq(&hwif->lock); + + if (start_queue) + blk_mq_run_hw_queues(q, true); + return; + } + spin_unlock_irq(&hwif->lock); + + rq = blk_get_request(q, REQ_OP_DRV_IN, 0); + scsi_req(rq)->cmd[0] = REQ_PARK_HEADS; + scsi_req(rq)->cmd_len = 1; + ide_req(rq)->type = ATA_PRIV_MISC; + ide_req(rq)->special = &timeout; + blk_execute_rq(q, NULL, rq, 1); + rc = scsi_req(rq)->result ? -EIO : 0; + blk_put_request(rq); + if (rc) + goto out; + + /* + * Make sure that *some* command is sent to the drive after the + * timeout has expired, so power management will be reenabled. + */ + rq = blk_get_request(q, REQ_OP_DRV_IN, BLK_MQ_REQ_NOWAIT); + if (IS_ERR(rq)) + goto out; + + scsi_req(rq)->cmd[0] = REQ_UNPARK_HEADS; + scsi_req(rq)->cmd_len = 1; + ide_req(rq)->type = ATA_PRIV_MISC; + spin_lock_irq(&hwif->lock); + ide_insert_request_head(drive, rq); + spin_unlock_irq(&hwif->lock); + +out: + return; +} + +ide_startstop_t ide_do_park_unpark(ide_drive_t *drive, struct request *rq) +{ + struct ide_cmd cmd; + struct ide_taskfile *tf = &cmd.tf; + + memset(&cmd, 0, sizeof(cmd)); + if (scsi_req(rq)->cmd[0] == REQ_PARK_HEADS) { + drive->sleep = *(unsigned long *)ide_req(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; + cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; + cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; + } else /* cmd == REQ_UNPARK_HEADS */ + tf->command = ATA_CMD_CHK_POWER; + + cmd.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; + cmd.protocol = ATA_PROT_NODATA; + + cmd.rq = rq; + + return do_rw_taskfile(drive, &cmd); +} + +ssize_t ide_park_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + ide_drive_t *drive = to_ide_device(dev); + ide_hwif_t *hwif = drive->hwif; + unsigned long now; + unsigned int msecs; + + if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) + return -EOPNOTSUPP; + + spin_lock_irq(&hwif->lock); + now = jiffies; + if (drive->dev_flags & IDE_DFLAG_PARKED && + time_after(drive->sleep, now)) + msecs = jiffies_to_msecs(drive->sleep - now); + else + msecs = 0; + spin_unlock_irq(&hwif->lock); + + return snprintf(buf, 20, "%u\n", msecs); +} + +ssize_t ide_park_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ +#define MAX_PARK_TIMEOUT 30000 + ide_drive_t *drive = to_ide_device(dev); + long int input; + int rc; + + rc = kstrtol(buf, 10, &input); + if (rc) + return rc; + if (input < -2) + return -EINVAL; + if (input > MAX_PARK_TIMEOUT) { + input = MAX_PARK_TIMEOUT; + rc = -EOVERFLOW; + } + + mutex_lock(&ide_setting_mtx); + if (input >= 0) { + if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD) + rc = -EOPNOTSUPP; + else if (input || drive->dev_flags & IDE_DFLAG_PARKED) + issue_park_cmd(drive, msecs_to_jiffies(input)); + } else { + if (drive->media == ide_disk) + switch (input) { + case -1: + drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD; + break; + case -2: + drive->dev_flags |= IDE_DFLAG_NO_UNLOAD; + break; + } + else + rc = -EOPNOTSUPP; + } + mutex_unlock(&ide_setting_mtx); + + return rc ? rc : len; +} |