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Commit 35538d78 authored by Gustavo Padovan's avatar Gustavo Padovan Committed by Greg Kroah-Hartman
Browse files

dma-buf/sw_sync: de-stage SW_SYNC 



SW_SYNC allows to run tests on the sync_file framework via debugfs on

<debugfs>/sync/sw_sync

Opening and closing the file triggers creation and release of a sync
timeline. To create fences on this timeline the SW_SYNC_IOC_CREATE_FENCE
ioctl should be used. To increment the timeline value use SW_SYNC_IOC_INC.

Also it exports Sync information on

<debugfs>/sync/info

Signed-off-by: default avatarGustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: default avatarEric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fc0c9a03

drivers/dma-buf/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -17,4 +17,17 @@ config SYNC_FILE 
	  Files fds, to the DRM driver for example. More details at

	  Documentation/sync_file.txt.



config SW_SYNC

	bool "Sync File Validation Framework"

	default n

	depends on SYNC_FILE

	depends on DEBUG_FS

	---help---

	  A sync object driver that uses a 32bit counter to coordinate

	  synchronization.  Useful when there is no hardware primitive backing

	  the synchronization.



	  WARNING: improper use of this can result in deadlocking kernel

	  drivers from userspace. Intended for test and debug only.



endmenu

drivers/dma-buf/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-y := dma-buf.o fence.o reservation.o seqno-fence.o fence-array.o

obj-$(CONFIG_SYNC_FILE)		+= sync_file.o

obj-$(CONFIG_SW_SYNC)		+= sw_sync.o sync_debug.o