From: Shane Francis <bigbeeshane@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: airlied@linux.ie, bigbeeshane@gmail.com,
alexander.deucher@amd.com, christian.koenig@amd.com
Subject: [PATCH v3 0/3] AMDGPU / RADEON / DRM Fix mapping of user pages
Date: Wed, 25 Mar 2020 00:24:47 +0000 [thread overview]
Message-ID: <20200325002450.5240-1-bigbeeshane@gmail.com> (raw)
This patch set is to fix a bug in amdgpu / radeon drm that results in
a crash when dma_map_sg combines elemnets within a scatterlist table.
There are 2 shortfalls in the current kernel.
1) AMDGPU / RADEON assumes that the requested and created scatterlist
table lengths using from dma_map_sg are equal. This may not be the
case using the newer dma-iommu implementation
2) drm_prime does not fetch the length of the scatterlist
via the correct dma macro, this can use the incorrect length
being used (>0) in places where dma_map_sg has updated the table
elements.
The sg_dma_len macro is representative of the length of the sg item
after dma_map_sg
Example Crash :
> [drm:amdgpu_ttm_backend_bind [amdgpu]] *ERROR* failed to pin userptr
This happens in OpenCL applications, causing them to crash or hang, on
either amdgpu-pro or ROCm OpenCL implementations
Shane Francis (3):
drm/prime: use dma length macro when mapping sg to arrays
drm/amdgpu: fix scatter-gather mapping with user pages
drm/radeon: fix scatter-gather mapping with user pages
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
drivers/gpu/drm/drm_prime.c | 4 +++-
drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
3 files changed, 5 insertions(+), 3 deletions(-)
--
2.26.0
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next reply other threads:[~2020-03-25 0:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 0:24 Shane Francis [this message]
2020-03-25 0:24 ` [PATCH v3 1/3] drm/prime: use length macro when mapping sgl Shane Francis
2020-03-25 7:54 ` Christian König
2020-03-25 0:24 ` [PATCH v3 2/3] drm/amdgpu: fix scatter-gather mapping with user pages Shane Francis
2020-03-25 0:24 ` [PATCH v3 3/3] drm/radeon: " Shane Francis
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