linux/block/blk-pm.c

9  * blk_pm_runtime_init - Block layer runtime PM initialization routine
14  *    Initialize runtime-PM-related fields for @q and start auto suspend for
15  *    @dev. Drivers that want to take advantage of request-based runtime PM
17  *    request queue @q has been allocated, and runtime PM for it can not happen
22  *    the autosuspend delay is set to -1 to make runtime suspend impossible
26  *    The block layer runtime PM is request based, so only works for drivers
39  * blk_pre_runtime_suspend - Pre runtime suspend check
43  *    This function will check if runtime suspend is allowed for the device
45  *    are requests pending, the device can not be runtime suspended; otherwise,
50  *    runtime PM core will try to autosuspend it some time later.
56  *    0		- OK to runtime suspend the device
57  *    -EBUSY	- Device should not be runtime suspended
108  * blk_post_runtime_suspend - Post runtime suspend processing
113  *    Update the queue's runtime status according to the return value of the
114  *    device's runtime suspend function and mark last busy for the device so
140  * blk_pre_runtime_resume - Pre runtime resume processing
144  *    Update the queue's runtime status to RESUMING in preparation for the
145  *    runtime resume of the device.
162  * blk_post_runtime_resume - Post runtime resume processing
168  *    whether the device's runtime-resume succeeded; even if it failed the
181  * blk_set_runtime_active - Force runtime status of the queue to be active
184  * If the device is left runtime suspended during system suspend the resume
185  * hook typically resumes the device and corrects runtime status
186  * accordingly. However, that does not affect the queue runtime PM status
191  * runtime PM status and re-enable peeking requests from the queue. It
195  * runtime resumes.  It does everything necessary to restart the queue.