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authorRafael J. Wysocki <rjw@sisk.pl>2008-06-12 23:24:06 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-06-12 14:25:09 -0700
commitd8f3de0d2412bb91639cfefc5b3c79dbf3812212 (patch)
tree05d0530d06e898b7eeac5c781ee9f00972a7f67a /include/linux/suspend.h
parent53eb2fbeb9e68e1a9a23945de8450999c46270ce (diff)
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Suspend-related patches for 2.6.27
ACPI PM: Add possibility to change suspend sequence There are some systems out there that don't work correctly with our current suspend/hibernation code ordering. Provide a workaround for these systems allowing them to pass 'acpi_sleep=old_ordering' in the kernel command line so that it will use the pre-ACPI 2.0 ("old") suspend code ordering. Unfortunately, this requires us to add a platform hook to the resuming of devices for recovering the platform in case one of the device drivers' .suspend() routines returns error code. Namely, ACPI 1.0 specifies that _PTS should be called before suspending devices, but _WAK still should be called before resuming them in order to undo the changes made by _PTS. However, if there is an error during suspending devices, they are automatically resumed without returning control to the PM core, so the _WAK has to be called from within device_resume() in that cases. The patch also reorders and refactors the ACPI suspend/hibernation code to avoid duplication as far as reasonably possible. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include/linux/suspend.h')
-rw-r--r--include/linux/suspend.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index a6977423baf7..e8e69159af71 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -86,6 +86,11 @@ typedef int __bitwise suspend_state_t;
* that implement @begin(), but platforms implementing @begin() should
* also provide a @end() which cleans up transitions aborted before
* @enter().
+ *
+ * @recover: Recover the platform from a suspend failure.
+ * Called by the PM core if the suspending of devices fails.
+ * This callback is optional and should only be implemented by platforms
+ * which require special recovery actions in that situation.
*/
struct platform_suspend_ops {
int (*valid)(suspend_state_t state);
@@ -94,6 +99,7 @@ struct platform_suspend_ops {
int (*enter)(suspend_state_t state);
void (*finish)(void);
void (*end)(void);
+ void (*recover)(void);
};
#ifdef CONFIG_SUSPEND
@@ -149,7 +155,7 @@ extern void mark_free_pages(struct zone *zone);
* The methods in this structure allow a platform to carry out special
* operations required by it during a hibernation transition.
*
- * All the methods below must be implemented.
+ * All the methods below, except for @recover(), must be implemented.
*
* @begin: Tell the platform driver that we're starting hibernation.
* Called right after shrinking memory and before freezing devices.
@@ -189,6 +195,11 @@ extern void mark_free_pages(struct zone *zone);
* @restore_cleanup: Clean up after a failing image restoration.
* Called right after the nonboot CPUs have been enabled and before
* thawing devices (runs with IRQs on).
+ *
+ * @recover: Recover the platform from a failure to suspend devices.
+ * Called by the PM core if the suspending of devices during hibernation
+ * fails. This callback is optional and should only be implemented by
+ * platforms which require special recovery actions in that situation.
*/
struct platform_hibernation_ops {
int (*begin)(void);
@@ -200,6 +211,7 @@ struct platform_hibernation_ops {
void (*leave)(void);
int (*pre_restore)(void);
void (*restore_cleanup)(void);
+ void (*recover)(void);
};
#ifdef CONFIG_HIBERNATION