staging: sw_sync: Add cpu based sync driver
Adds a base sync driver that uses the cpu for serialization.
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Erik Gilling <konkers@android.com>
[jstultz: Add commit message, whitespace fixes and move to
staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig
index c95aede..cc406cc 100644
--- a/drivers/staging/android/Kconfig
+++ b/drivers/staging/android/Kconfig
@@ -81,6 +81,24 @@
drivers. Sync implementations can take advantage of hardware
synchronization built into devices like GPUs.
+config SW_SYNC
+ bool "Software synchronization objects"
+ default n
+ depends on SYNC
+ help
+ A sync object driver that uses a 32bit counter to coordinate
+ syncrhronization. Useful when there is no hardware primitive backing
+ the synchronization.
+
+config SW_SYNC_USER
+ bool "Userspace API for SW_SYNC"
+ default n
+ depends on SW_SYNC
+ help
+ Provides a user space API to the sw sync object.
+ *WARNING* improper use of this can result in deadlocking kernel
+ drivers from userspace.
+
endif # if ANDROID
endmenu