Hi Shuah
On 2017-02-23 22:43, Shuah Khan wrote:
On Tue, Feb 14, 2017 at 12:52 AM, Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:
It turned out that all versions of MFC v6+ hardware doesn't have a strict
requirement for ALL buffers to be allocated on higher addresses than the
firmware base like it was documented for MFC v5. This requirement is true
only for the device and per-context buffers. All video data buffers can be
allocated anywhere for all MFC v6+ versions. Basing on this fact, the
special DMA configuration based on two reserved memory regions is not
really needed for MFC v6+ devices, because the memory requirements for the
firmware, device and per-context buffers can be fulfilled by the simple
probe-time pre-allocated block allocator instroduced in previous patch.
This patch enables support for such pre-allocated block based allocator
always for MFC v6+ devices. Due to the limitations of the memory management
subsystem the largest supported size of the pre-allocated buffer when no
CMA (Contiguous Memory Allocator) is enabled is 4MiB.
This patch also removes the requirement to provide two reserved memory
regions for MFC v6+ devices in device tree. Now the driver is fully
functional without them.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Hi Marek,
This patch breaks display manager. exynos_drm_gem_create() isn't happy.
dmesg and console are flooded with
odroid login: [ 209.170566] [drm:exynos_drm_gem_create] *ERROR* failed to allo.
[ 212.173222] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 215.354790] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 218.736464] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 221.837128] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 226.284827] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 229.242498] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 232.063150] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 235.799993] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 239.472061] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 242.567465] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 246.500541] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 249.996018] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 253.837272] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 257.048782] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 260.084819] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 263.448611] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 266.271074] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 269.011558] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 272.039066] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 275.404938] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 278.339033] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 281.274751] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 284.641202] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 287.461039] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 291.062011] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 294.746870] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
[ 298.246570] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.
I don't think this is an acceptable behavior. It is a regression.
This is a really poor bug report... Could you elaborate a bit how to
reproduce
this? Could you provide your kernel config and information about test
environment?
I suspect that you use CMA without IOMMU and you have too small global
CMA region.
After this patch MFC driver uses global CMA region instead of the MFC's
private
ones, so one has to ensure that the global region is large enough.
> [...]
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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