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tu: Pass real size of prime buffers to allocator

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The msm driver reserves the actual DMABUF size in the memory map, while
TU can request smaller memory chunk to be allocated. This potentially
can lead to a situation when next allocation IOVA will be in the middle
of the address space which is reserved for the DMABUF. Pass the
`real_size' to TU allocator instead, so that kernel and userspace have
the same picture of memory allocations.

Cc: mesa-stable
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24861>
This commit is contained in:
Dmitry Baryshkov 2023-08-24 07:48:54 +03:00 • committed by Marge Bot
parent cda1961835
commit 2fdcc00b01
1 changed files with 3 additions and 0 deletions
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3
src/freedreno/vulkan/tu_knl_drm_msm.cc
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@ -580,6 +580,9 @@ msm_bo_init_dmabuf(struct tu_device *dev,
if (real_size < 0 || (uint64_t) real_size < size)
return vk_error(dev, VK_ERROR_INVALID_EXTERNAL_HANDLE);
/* iova allocation needs to consider the object's *real* size: */
size = real_size;
/* Importing the same dmabuf several times would yield the same
* gem_handle. Thus there could be a race when destroying
* BO and importing the same dmabuf from different threads.