201bffa464
* Move hack for flush requests from choose_drive() to do_ide_request().
* Add ide_plug_device() helper and convert core IDE code from using
per-hwgroup lock as a request lock to use the ->queue_lock instead.
* Remove no longer needed:
- choose_drive() function
- WAKEUP() macro
- 'sleeping' flag from ide_hwif_t
- 'service_{start,time}' fields from ide_drive_t
This patch results in much simpler and more maintainable code
(besides being a scalability improvement).
v2:
* Fixes/improvements based on review from Elias:
- take as many requests off the queue as possible
- remove now redundant BUG_ON()
Cc: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
#include <linux/kernel.h>
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#include <linux/ide.h>
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#include <linux/jiffies.h>
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#include <linux/blkdev.h>
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DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
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static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
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{
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ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
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struct request_queue *q = drive->queue;
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struct request *rq;
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int rc;
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timeout += jiffies;
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spin_lock_irq(&hwgroup->lock);
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if (drive->dev_flags & IDE_DFLAG_PARKED) {
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int reset_timer = time_before(timeout, drive->sleep);
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int start_queue = 0;
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drive->sleep = timeout;
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wake_up_all(&ide_park_wq);
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if (reset_timer && del_timer(&hwgroup->timer))
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start_queue = 1;
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spin_unlock_irq(&hwgroup->lock);
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if (start_queue) {
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spin_lock_irq(q->queue_lock);
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blk_start_queueing(q);
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spin_unlock_irq(q->queue_lock);
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}
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return;
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}
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spin_unlock_irq(&hwgroup->lock);
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rq = blk_get_request(q, READ, __GFP_WAIT);
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rq->cmd[0] = REQ_PARK_HEADS;
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rq->cmd_len = 1;
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->special = &timeout;
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rc = blk_execute_rq(q, NULL, rq, 1);
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blk_put_request(rq);
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if (rc)
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goto out;
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/*
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* Make sure that *some* command is sent to the drive after the
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* timeout has expired, so power management will be reenabled.
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*/
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rq = blk_get_request(q, READ, GFP_NOWAIT);
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if (unlikely(!rq))
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goto out;
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rq->cmd[0] = REQ_UNPARK_HEADS;
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rq->cmd_len = 1;
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rq->cmd_type = REQ_TYPE_SPECIAL;
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elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
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out:
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return;
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}
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ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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ide_drive_t *drive = to_ide_device(dev);
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ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
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unsigned long now;
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unsigned int msecs;
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if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
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return -EOPNOTSUPP;
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spin_lock_irq(&hwgroup->lock);
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now = jiffies;
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if (drive->dev_flags & IDE_DFLAG_PARKED &&
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time_after(drive->sleep, now))
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msecs = jiffies_to_msecs(drive->sleep - now);
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else
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msecs = 0;
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spin_unlock_irq(&hwgroup->lock);
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return snprintf(buf, 20, "%u\n", msecs);
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}
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ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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#define MAX_PARK_TIMEOUT 30000
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ide_drive_t *drive = to_ide_device(dev);
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long int input;
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int rc;
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rc = strict_strtol(buf, 10, &input);
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if (rc || input < -2)
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return -EINVAL;
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if (input > MAX_PARK_TIMEOUT) {
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input = MAX_PARK_TIMEOUT;
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rc = -EOVERFLOW;
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}
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mutex_lock(&ide_setting_mtx);
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if (input >= 0) {
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if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
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rc = -EOPNOTSUPP;
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else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
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issue_park_cmd(drive, msecs_to_jiffies(input));
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} else {
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if (drive->media == ide_disk)
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switch (input) {
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case -1:
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drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
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break;
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case -2:
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drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
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break;
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}
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else
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rc = -EOPNOTSUPP;
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}
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mutex_unlock(&ide_setting_mtx);
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return rc ? rc : len;
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}
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