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authorMaarten Lankhorst <maarten.lankhorst@canonical.com>2014-07-01 12:57:20 +0200
committerChanho Park <chanho61.park@samsung.com>2014-11-21 19:12:22 +0900
commit59f7058275c07ded236024dcc9e949c79e613e33 (patch)
treec2bcaf4c78f5af3d4b1d029200090c0eabb20073 /Documentation
parentde10213386824a424877c276f09f9ef3aab86b4e (diff)
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seqno-fence: Hardware dma-buf implementation of fencing (v6)
This type of fence can be used with hardware synchronization for simple hardware that can block execution until the condition (dma_buf[offset] - value) >= 0 has been met when WAIT_GEQUAL is used, or (dma_buf[offset] != 0) has been met when WAIT_NONZERO is set. A software fallback still has to be provided in case the fence is used with a device that doesn't support this mechanism. It is useful to expose this for graphics cards that have an op to support this. Some cards like i915 can export those, but don't have an option to wait, so they need the software fallback. I extended the original patch by Rob Clark. v1: Original v2: Renamed from bikeshed to seqno, moved into dma-fence.c since not much was left of the file. Lots of documentation added. v3: Use fence_ops instead of custom callbacks. Moved to own file to avoid circular dependency between dma-buf.h and fence.h v4: Add spinlock pointer to seqno_fence_init v5: Add condition member to allow wait for != 0. Fix small style errors pointed out by checkpatch. v6: Move to a separate file. Fix up api changes in fences. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Acked-by: Daniel Vetter <daniel@ffwll.ch> Reviewed-by: Rob Clark <robdclark@gmail.com> #v4 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/DocBook/device-drivers.tmpl2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl
index 38d811bd7d6..09a3ca550b8 100644
--- a/Documentation/DocBook/device-drivers.tmpl
+++ b/Documentation/DocBook/device-drivers.tmpl
@@ -127,7 +127,9 @@ X!Edrivers/base/interface.c
<sect1><title>Device Drivers DMA Management</title>
!Edrivers/dma-buf/dma-buf.c
!Edrivers/dma-buf/fence.c
+!Edrivers/dma-buf/seqno-fence.c
!Iinclude/linux/fence.h
+!Iinclude/linux/seqno-fence.h
!Iinclude/linux/reservation.h
!Edrivers/base/dma-coherent.c
!Edrivers/base/dma-mapping.c