centos man page for blk_pm_runtime_init

BLK_PM_RUNTIME_INIT(9)						   Block Devices					    BLK_PM_RUNTIME_INIT(9)

NAME
       blk_pm_runtime_init - Block layer runtime PM initialization routine

SYNOPSIS
       void blk_pm_runtime_init(struct request_queue * q, struct device * dev);

ARGUMENTS
       q
	   the queue of the device

       dev
	   the device the queue belongs to

DESCRIPTION
       Initialize runtime-PM-related fields for q and start auto suspend for dev. Drivers that want to take advantage of request-based runtime PM
       should call this function after dev has been initialized, and its request queue q has been allocated, and runtime PM for it can not happen
       yet(either due to disabled/forbidden or its usage_count > 0). In most cases, driver should call this function before any I/O has taken
       place.

       This function takes care of setting up using auto suspend for the device, the autosuspend delay is set to -1 to make runtime suspend
       impossible until an updated value is either set by user or by driver. Drivers do not need to touch other autosuspend settings.

       The block layer runtime PM is request based, so only works for drivers that use request as their IO unit instead of those directly use
       bio's.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    BLK_PM_RUNTIME_INIT(9)