Discussion:
[PATCH] arm64: defconfig: Increase CMA size for VC4
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Stefan Wahren
2018-05-02 21:31:40 UTC
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The VC4 needs more memory than the default setting (16 MB):

vc4-drm soc:gpu: swiotlb: coherent allocation failed, size=16777216
[drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
vc4_v3d 3fc00000.v3d: Failed to allocate memory for tile binning: -12.
You may need to enable CMA or give it more memory.
vc4-drm soc:gpu: failed to bind 3fc00000.v3d (ops vc4_v3d_ops [vc4]): -12
vc4-drm soc:gpu: master bind failed: -12
vc4-drm: probe of soc:gpu failed with error -12

So increase the value to 32 MB and fix this issue.

Signed-off-by: Stefan Wahren <***@i2se.com>
---

Hi,
i known it's a little bit late for 4.18 or should i rebase for 4.17?

Regards

arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 7ca583e..0e1f6d7 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -172,6 +172,7 @@ CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DMA_CMA=y
+CONFIG_CMA_SIZE_MBYTES=32
CONFIG_MTD=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_M25P80=y
--
2.7.4
Eric Anholt
2018-05-03 21:20:42 UTC
Permalink
Post by Stefan Wahren
vc4-drm soc:gpu: swiotlb: coherent allocation failed, size=16777216
vc4_v3d 3fc00000.v3d: Failed to allocate memory for tile binning: -12.
You may need to enable CMA or give it more memory.
vc4-drm soc:gpu: failed to bind 3fc00000.v3d (ops vc4_v3d_ops [vc4]): -12
vc4-drm soc:gpu: master bind failed: -12
vc4-drm: probe of soc:gpu failed with error -12
So increase the value to 32 MB and fix this issue.
If there was a way to check how big the CMA pool is, then we could
probably have V3D disable itself when the pool was too small. It's not
like V3D rendering is going to actually *work* with just a 32mb pool to
play in.

That said, I'd also be fine with this patch.

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