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authorBart Van Assche <bvanassche@acm.org>2018-09-27 00:01:03 +0300
committerJens Axboe <axboe@kernel.dk>2018-09-27 00:11:28 +0300
commitbca6b067b0b269a7b8ba129e2a918309ca8b4a55 (patch)
tree8c41db994ddaf2023d881189cd947fce24f3b7d3 /include/linux/blk-pm.h
parent3cfa210bf3fe0803cca17f3775d8cf2360d5f443 (diff)
downloadlinux-bca6b067b0b269a7b8ba129e2a918309ca8b4a55.tar.xz
block: Move power management code into a new source file
Move the code for runtime power management from blk-core.c into the new source file blk-pm.c. Move the corresponding declarations from <linux/blkdev.h> into <linux/blk-pm.h>. 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 <linux/blkdev.h> 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 <bvanassche@acm.org> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Jianchao Wang <jianchao.w.wang@oracle.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-pm.h')
-rw-r--r--include/linux/blk-pm.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/blk-pm.h b/include/linux/blk-pm.h
new file mode 100644
index 000000000000..b80c65aba249
--- /dev/null
+++ b/include/linux/blk-pm.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _BLK_PM_H_
+#define _BLK_PM_H_
+
+struct device;
+struct request_queue;
+
+/*
+ * block layer runtime pm functions
+ */
+#ifdef CONFIG_PM
+extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
+extern int blk_pre_runtime_suspend(struct request_queue *q);
+extern void blk_post_runtime_suspend(struct request_queue *q, int err);
+extern void blk_pre_runtime_resume(struct request_queue *q);
+extern void blk_post_runtime_resume(struct request_queue *q, int err);
+extern void blk_set_runtime_active(struct request_queue *q);
+#else
+static inline void blk_pm_runtime_init(struct request_queue *q,
+ struct device *dev) {}
+#endif
+
+#endif /* _BLK_PM_H_ */