aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/ide/Makefile2
-rw-r--r--drivers/ide/ide-io.c29
-rw-r--r--drivers/ide/ide-iops.c29
-rw-r--r--drivers/ide/ide-park.c121
-rw-r--r--drivers/ide/ide-probe.c5
-rw-r--r--drivers/ide/ide-taskfile.c11
-rw-r--r--drivers/ide/ide.c1
-rw-r--r--include/linux/ide.h13
8 files changed, 206 insertions, 5 deletions
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 0c30adb..ceaf779 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -5,7 +5,7 @@
EXTRA_CFLAGS += -Idrivers/ide
ide-core-y += ide.o ide-ioctls.o ide-io.o ide-iops.o ide-lib.o ide-probe.o \
- ide-taskfile.o ide-pio-blacklist.o
+ ide-taskfile.o ide-park.o ide-pio-blacklist.o
# core IDE code
ide-core-$(CONFIG_IDE_TIMINGS) += ide-timings.o
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index e205f46..77c6eae 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -672,7 +672,32 @@ EXPORT_SYMBOL_GPL(ide_devset_execute);
static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
{
- switch (rq->cmd[0]) {
+ 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_DEVSET_EXEC:
{
int err, (*setfunc)(ide_drive_t *, int) = rq->special;
@@ -1008,7 +1033,7 @@ static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
}
hwgroup->hwif = hwif;
hwgroup->drive = drive;
- drive->dev_flags &= ~IDE_DFLAG_SLEEPING;
+ drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
drive->service_start = jiffies;
if (blk_queue_plugged(drive->queue)) {
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 91182eb..b762deb 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -1020,6 +1020,7 @@ static void ide_disk_pre_reset(ide_drive_t *drive)
drive->special.b.recalibrate = legacy;
drive->mult_count = 0;
+ drive->dev_flags &= ~IDE_DFLAG_PARKED;
if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
(drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
@@ -1079,12 +1080,13 @@ static void pre_reset(ide_drive_t *drive)
static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
{
unsigned int unit;
- unsigned long flags;
+ unsigned long flags, timeout;
ide_hwif_t *hwif;
ide_hwgroup_t *hwgroup;
struct ide_io_ports *io_ports;
const struct ide_tp_ops *tp_ops;
const struct ide_port_ops *port_ops;
+ DEFINE_WAIT(wait);
spin_lock_irqsave(&ide_lock, flags);
hwif = HWIF(drive);
@@ -1111,6 +1113,31 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
return ide_started;
}
+ /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
+ do {
+ unsigned long now;
+
+ prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
+ timeout = jiffies;
+ for (unit = 0; unit < MAX_DRIVES; unit++) {
+ ide_drive_t *tdrive = &hwif->drives[unit];
+
+ if (tdrive->dev_flags & IDE_DFLAG_PRESENT &&
+ tdrive->dev_flags & IDE_DFLAG_PARKED &&
+ time_after(tdrive->sleep, timeout))
+ timeout = tdrive->sleep;
+ }
+
+ now = jiffies;
+ if (time_before_eq(timeout, now))
+ break;
+
+ spin_unlock_irqrestore(&ide_lock, flags);
+ timeout = schedule_timeout_uninterruptible(timeout - now);
+ spin_lock_irqsave(&ide_lock, flags);
+ } while (timeout);
+ finish_wait(&ide_park_wq, &wait);
+
/*
* First, reset any device state data we were maintaining
* for any of the drives on this interface.
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
new file mode 100644
index 0000000..03b00e5
--- /dev/null
+++ b/drivers/ide/ide-park.c
@@ -0,0 +1,121 @@
+#include <linux/kernel.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)
+{
+ struct request_queue *q = drive->queue;
+ struct request *rq;
+ int rc;
+
+ timeout += jiffies;
+ spin_lock_irq(&ide_lock);
+ if (drive->dev_flags & IDE_DFLAG_PARKED) {
+ ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
+ int reset_timer;
+
+ reset_timer = time_before(timeout, drive->sleep);
+ drive->sleep = timeout;
+ wake_up_all(&ide_park_wq);
+ if (reset_timer && hwgroup->sleeping &&
+ del_timer(&hwgroup->timer)) {
+ hwgroup->sleeping = 0;
+ hwgroup->busy = 0;
+ blk_start_queueing(q);
+ }
+ spin_unlock_irq(&ide_lock);
+ return;
+ }
+ spin_unlock_irq(&ide_lock);
+
+ rq = blk_get_request(q, READ, __GFP_WAIT);
+ rq->cmd[0] = REQ_PARK_HEADS;
+ rq->cmd_len = 1;
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ rq->special = &timeout;
+ rc = blk_execute_rq(q, NULL, rq, 1);
+ 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, READ, GFP_NOWAIT);
+ if (unlikely(!rq))
+ goto out;
+
+ rq->cmd[0] = REQ_UNPARK_HEADS;
+ rq->cmd_len = 1;
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
+
+out:
+ return;
+}
+
+ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ ide_drive_t *drive = to_ide_device(dev);
+ unsigned long now;
+ unsigned int msecs;
+
+ if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
+ return -EOPNOTSUPP;
+
+ spin_lock_irq(&ide_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(&ide_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 = strict_strtol(buf, 10, &input);
+ if (rc || 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;
+}
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index de8edd3..f27baa5 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -208,6 +208,8 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
drive->ready_stat = 0;
if (ata_id_cdb_intr(id))
drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
+ /* we don't do head unloading on ATAPI devices */
+ drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
return;
}
@@ -223,6 +225,9 @@ static inline void do_identify (ide_drive_t *drive, u8 cmd)
drive->media = ide_disk;
+ if (!ata_id_has_unload(drive->id))
+ drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
+
printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
return;
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index a4c2d91..bf4fb9d 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -152,7 +152,16 @@ static ide_startstop_t task_no_data_intr(ide_drive_t *drive)
if (!custom)
ide_end_drive_cmd(drive, stat, ide_read_error(drive));
- else if (tf->command == ATA_CMD_SET_MULTI)
+ else if (tf->command == ATA_CMD_IDLEIMMEDIATE) {
+ hwif->tp_ops->tf_read(drive, task);
+ if (tf->lbal != 0xc4) {
+ printk(KERN_ERR "%s: head unload failed!\n",
+ drive->name);
+ ide_tf_dump(drive->name, tf);
+ } else
+ drive->dev_flags |= IDE_DFLAG_PARKED;
+ ide_end_drive_cmd(drive, stat, ide_read_error(drive));
+ } else if (tf->command == ATA_CMD_SET_MULTI)
drive->mult_count = drive->mult_req;
return ide_stopped;
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 083783e..04f8f13 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -587,6 +587,7 @@ static struct device_attribute ide_dev_attrs[] = {
__ATTR_RO(model),
__ATTR_RO(firmware),
__ATTR(serial, 0400, serial_show, NULL),
+ __ATTR(unload_heads, 0644, ide_park_show, ide_park_store),
__ATTR_NULL
};
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 8247b28..c47e371 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -156,6 +156,8 @@ enum {
*/
#define REQ_DRIVE_RESET 0x20
#define REQ_DEVSET_EXEC 0x21
+#define REQ_PARK_HEADS 0x22
+#define REQ_UNPARK_HEADS 0x23
/*
* Check for an interrupt and acknowledge the interrupt status
@@ -573,6 +575,10 @@ enum {
/* retrying in PIO */
IDE_DFLAG_DMA_PIO_RETRY = (1 << 25),
IDE_DFLAG_LBA = (1 << 26),
+ /* don't unload heads */
+ IDE_DFLAG_NO_UNLOAD = (1 << 27),
+ /* heads unloaded, please don't reset port */
+ IDE_DFLAG_PARKED = (1 << 28)
};
struct ide_drive_s {
@@ -1207,6 +1213,13 @@ int ide_check_atapi_device(ide_drive_t *, const char *);
void ide_init_pc(struct ide_atapi_pc *);
+/* Disk head parking */
+extern wait_queue_head_t ide_park_wq;
+ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len);
+
/*
* Special requests for ide-tape block device strategy routine.
*
generated by cgit v1.1 at 2024-05-26 14:43:29 +0000