PM / Hibernate: Update kerneldoc comments in hibernate.c
Some of the kerneldoc comments in kernel/power/hibernate.c are outdated and some of them don't adhere to the kernel's standards. Update them and make them look in a consistent way. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
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Rafael J. Wysocki
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f42a9813fb
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@ -54,10 +54,9 @@ static int hibernation_mode = HIBERNATION_SHUTDOWN;
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static const struct platform_hibernation_ops *hibernation_ops;
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/**
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* hibernation_set_ops - set the global hibernate operations
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* @ops: the hibernation operations to use in subsequent hibernation transitions
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* hibernation_set_ops - Set the global hibernate operations.
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* @ops: Hibernation operations to use in subsequent hibernation transitions.
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*/
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void hibernation_set_ops(const struct platform_hibernation_ops *ops)
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{
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if (ops && !(ops->begin && ops->end && ops->pre_snapshot
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@ -114,10 +113,9 @@ static int hibernation_test(int level) { return 0; }
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#endif /* !CONFIG_PM_DEBUG */
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/**
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* platform_begin - tell the platform driver that we're starting
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* hibernation
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* platform_begin - Call platform to start hibernation.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static int platform_begin(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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@ -125,10 +123,9 @@ static int platform_begin(int platform_mode)
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}
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/**
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* platform_end - tell the platform driver that we've entered the
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* working state
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* platform_end - Call platform to finish transition to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static void platform_end(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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@ -136,8 +133,11 @@ static void platform_end(int platform_mode)
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}
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/**
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* platform_pre_snapshot - prepare the machine for hibernation using the
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* platform driver if so configured and return an error code if it fails
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* platform_pre_snapshot - Call platform to prepare the machine for hibernation.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to prepare the system for creating a hibernate image,
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* if so configured, and return an error code if that fails.
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*/
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static int platform_pre_snapshot(int platform_mode)
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@ -147,10 +147,14 @@ static int platform_pre_snapshot(int platform_mode)
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}
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/**
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* platform_leave - prepare the machine for switching to the normal mode
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* of operation using the platform driver (called with interrupts disabled)
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* platform_leave - Call platform to prepare a transition to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver prepare to prepare the machine for switching to the
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* normal mode of operation.
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*
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* This routine is called on one CPU with interrupts disabled.
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*/
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static void platform_leave(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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@ -158,10 +162,14 @@ static void platform_leave(int platform_mode)
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}
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/**
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* platform_finish - switch the machine to the normal mode of operation
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* using the platform driver (must be called after platform_prepare())
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* platform_finish - Call platform to switch the system to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to switch the machine to the normal mode of
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* operation.
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*
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* This routine must be called after platform_prepare().
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*/
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static void platform_finish(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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@ -169,11 +177,15 @@ static void platform_finish(int platform_mode)
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}
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/**
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* platform_pre_restore - prepare the platform for the restoration from a
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* hibernation image. If the restore fails after this function has been
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* called, platform_restore_cleanup() must be called.
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* platform_pre_restore - Prepare for hibernate image restoration.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to prepare the system for resume from a hibernation
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* image.
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*
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* If the restore fails after this function has been called,
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* platform_restore_cleanup() must be called.
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*/
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static int platform_pre_restore(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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@ -181,12 +193,16 @@ static int platform_pre_restore(int platform_mode)
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}
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/**
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* platform_restore_cleanup - switch the platform to the normal mode of
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* operation after a failing restore. If platform_pre_restore() has been
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* called before the failing restore, this function must be called too,
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* regardless of the result of platform_pre_restore().
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* platform_restore_cleanup - Switch to the working state after failing restore.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to switch the system to the normal mode of operation
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* after a failing restore.
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*
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* If platform_pre_restore() has been called before the failing restore, this
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* function must be called too, regardless of the result of
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* platform_pre_restore().
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*/
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static void platform_restore_cleanup(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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@ -194,10 +210,9 @@ static void platform_restore_cleanup(int platform_mode)
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}
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/**
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* platform_recover - recover the platform from a failure to suspend
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* devices.
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* platform_recover - Recover from a failure to suspend devices.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static void platform_recover(int platform_mode)
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{
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if (platform_mode && hibernation_ops && hibernation_ops->recover)
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@ -205,13 +220,12 @@ static void platform_recover(int platform_mode)
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}
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/**
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* swsusp_show_speed - print the time elapsed between two events.
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* @start: Starting event.
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* @stop: Final event.
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* @nr_pages - number of pages processed between @start and @stop
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* @msg - introductory message to print
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* swsusp_show_speed - Print time elapsed between two events during hibernation.
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* @start: Starting event.
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* @stop: Final event.
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* @nr_pages: Number of memory pages processed between @start and @stop.
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* @msg: Additional diagnostic message to print.
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*/
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void swsusp_show_speed(struct timeval *start, struct timeval *stop,
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unsigned nr_pages, char *msg)
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{
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@ -234,11 +248,14 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
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}
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/**
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* create_image - freeze devices that need to be frozen with interrupts
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* off, create the hibernation image and thaw those devices. Control
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* reappears in this routine after a restore.
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* create_image - Create a hibernation image.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
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* and execute the drivers' .thaw_noirq() callbacks.
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*
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* Control reappears in this routine after the subsequent restore.
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*/
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static int create_image(int platform_mode)
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{
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int error;
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@ -303,14 +320,11 @@ static int create_image(int platform_mode)
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}
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/**
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* hibernation_snapshot - quiesce devices and create the hibernation
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* snapshot image.
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* @platform_mode - if set, use the platform driver, if available, to
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* prepare the platform firmware for the power transition.
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* hibernation_snapshot - Quiesce devices and create a hibernation image.
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* @platform_mode: If set, use platform driver to prepare for the transition.
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*
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* Must be called with pm_mutex held
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* This routine must be called with pm_mutex held.
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*/
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int hibernation_snapshot(int platform_mode)
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{
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pm_message_t msg = PMSG_RECOVER;
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@ -370,13 +384,14 @@ int hibernation_snapshot(int platform_mode)
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}
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/**
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* resume_target_kernel - prepare devices that need to be suspended with
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* interrupts off, restore the contents of highmem that have not been
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* restored yet from the image and run the low level code that will restore
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* the remaining contents of memory and switch to the just restored target
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* kernel.
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* resume_target_kernel - Restore system state from a hibernation image.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Execute device drivers' .freeze_noirq() callbacks, restore the contents of
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* highmem that have not been restored yet from the image and run the low-level
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* code that will restore the remaining contents of memory and switch to the
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* just restored target kernel.
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*/
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static int resume_target_kernel(bool platform_mode)
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{
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int error;
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@ -444,14 +459,12 @@ static int resume_target_kernel(bool platform_mode)
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}
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/**
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* hibernation_restore - quiesce devices and restore the hibernation
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* snapshot image. If successful, control returns in hibernation_snaphot()
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* @platform_mode - if set, use the platform driver, if available, to
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* prepare the platform firmware for the transition.
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* hibernation_restore - Quiesce devices and restore from a hibernation image.
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* @platform_mode: If set, use platform driver to prepare for the transition.
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*
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* Must be called with pm_mutex held
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* This routine must be called with pm_mutex held. If it is successful, control
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* reappears in the restored target kernel in hibernation_snaphot().
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*/
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int hibernation_restore(int platform_mode)
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{
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int error;
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@ -471,10 +484,8 @@ int hibernation_restore(int platform_mode)
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}
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/**
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* hibernation_platform_enter - enter the hibernation state using the
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* platform driver (if available)
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* hibernation_platform_enter - Power off the system using the platform driver.
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*/
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int hibernation_platform_enter(void)
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{
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int error;
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@ -545,12 +556,12 @@ int hibernation_platform_enter(void)
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}
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/**
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* power_down - Shut the machine down for hibernation.
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* power_down - Shut the machine down for hibernation.
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*
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* Use the platform driver, if configured so; otherwise try
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* to power off or reboot.
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* Use the platform driver, if configured, to put the system into the sleep
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* state corresponding to hibernation, or try to power it off or reboot,
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* depending on the value of hibernation_mode.
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*/
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static void power_down(void)
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{
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switch (hibernation_mode) {
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@ -587,9 +598,8 @@ static int prepare_processes(void)
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}
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/**
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* hibernate - The granpappy of the built-in hibernation management
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* hibernate - Carry out system hibernation, including saving the image.
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*/
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int hibernate(void)
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{
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int error;
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@ -667,17 +677,20 @@ int hibernate(void)
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/**
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* software_resume - Resume from a saved image.
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* software_resume - Resume from a saved hibernation image.
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*
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* Called as a late_initcall (so all devices are discovered and
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* initialized), we call swsusp to see if we have a saved image or not.
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* If so, we quiesce devices, the restore the saved image. We will
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* return above (in hibernate() ) if everything goes well.
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* Otherwise, we fail gracefully and return to the normally
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* scheduled program.
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* This routine is called as a late initcall, when all devices have been
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* discovered and initialized already.
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*
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* The image reading code is called to see if there is a hibernation image
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* available for reading. If that is the case, devices are quiesced and the
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* contents of memory is restored from the saved image.
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*
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* If this is successful, control reappears in the restored target kernel in
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* hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
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* attempts to recover gracefully and make the kernel return to the normal mode
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* of operation.
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*/
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static int software_resume(void)
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{
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int error;
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@ -807,21 +820,17 @@ static const char * const hibernation_modes[] = {
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[HIBERNATION_TESTPROC] = "testproc",
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};
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/**
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* disk - Control hibernation mode
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/*
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* /sys/power/disk - Control hibernation mode.
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*
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* Suspend-to-disk can be handled in several ways. We have a few options
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* for putting the system to sleep - using the platform driver (e.g. ACPI
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* or other hibernation_ops), powering off the system or rebooting the
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* system (for testing) as well as the two test modes.
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* Hibernation can be handled in several ways. There are a few different ways
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* to put the system into the sleep state: using the platform driver (e.g. ACPI
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* or other hibernation_ops), powering it off or rebooting it (for testing
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* mostly), or using one of the two available test modes.
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*
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* The system can support 'platform', and that is known a priori (and
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* encoded by the presence of hibernation_ops). However, the user may
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* choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
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* test modes, 'test' or 'testproc'.
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*
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* show() will display what the mode is currently set to.
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* store() will accept one of
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* The sysfs file /sys/power/disk provides an interface for selecting the
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* hibernation mode to use. Reading from this file causes the available modes
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* to be printed. There are 5 modes that can be supported:
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*
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* 'platform'
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* 'shutdown'
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@ -829,8 +838,14 @@ static const char * const hibernation_modes[] = {
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* 'test'
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* 'testproc'
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*
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* It will only change to 'platform' if the system
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* supports it (as determined by having hibernation_ops).
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* If a platform hibernation driver is in use, 'platform' will be supported
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* and will be used by default. Otherwise, 'shutdown' will be used by default.
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* The selected option (i.e. the one corresponding to the current value of
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* hibernation_mode) is enclosed by a square bracket.
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*
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* To select a given hibernation mode it is necessary to write the mode's
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* string representation (as returned by reading from /sys/power/disk) back
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* into /sys/power/disk.
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*/
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static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
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@ -863,7 +878,6 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
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return buf-start;
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}
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static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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