kernel/block/blk-pm.c, branch linux-5.1.y

block: remove the queue_lock indirection

2018-11-15T19:17:28Z

With the legacy request path gone there is no good reason to keep queue_lock as a pointer, we can always use the embedded lock now. Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig Fixed floppy and blk-cgroup missing conversions and half done edits. Signed-off-by: Jens Axboe

blk-mq: Enable support for runtime power management

2018-09-26T21:11:29Z

Now that the blk-mq core processes power management requests (marked with RQF_PREEMPT) in other states than RPM_ACTIVE, enable runtime power management for blk-mq. Signed-off-by: Bart Van Assche Reviewed-by: Ming Lei Reviewed-by: Christoph Hellwig Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Alan Stern Signed-off-by: Jens Axboe

block: Make blk_get_request() block for non-PM requests while suspended

2018-09-26T21:11:29Z

Instead of allowing requests that are not power management requests to enter the queue in runtime suspended status (RPM_SUSPENDED), make the blk_get_request() caller block. This change fixes a starvation issue: it is now guaranteed that power management requests will be executed no matter how many blk_get_request() callers are waiting. For blk-mq, instead of maintaining the q->nr_pending counter, rely on q->q_usage_counter. Call pm_runtime_mark_last_busy() every time a request finishes instead of only if the queue depth drops to zero. Signed-off-by: Bart Van Assche Reviewed-by: Ming Lei Reviewed-by: Christoph Hellwig Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Alan Stern Signed-off-by: Jens Axboe

block: Move power management code into a new source file

2018-09-26T21:11:28Z

Move the code for runtime power management from blk-core.c into the new source file blk-pm.c. Move the corresponding declarations from into . For CONFIG_PM=n, leave out the declarations of the functions that are not used in that mode. This patch not only reduces the number of #ifdefs in the block layer core code but also reduces the size of header file and hence should help to reduce the build time of the Linux kernel if CONFIG_PM is not defined. Signed-off-by: Bart Van Assche Reviewed-by: Ming Lei Reviewed-by: Christoph Hellwig Cc: Jianchao Wang Cc: Hannes Reinecke Cc: Johannes Thumshirn Cc: Alan Stern Signed-off-by: Jens Axboe