Alex DeucherandGreg Kroah-Hartman 8ad4838040 drm/amdkfd: don't allow mapping the MMIO HDP page with large pages ...

commit be4a2a81b6 upstream.

We don't get the right offset in that case.  The GPU has
an unused 4K area of the register BAR space into which you can
remap registers.  We remap the HDP flush registers into this
space to allow userspace (CPU or GPU) to flush the HDP when it
updates VRAM.  However, on systems with >4K pages, we end up
exposing PAGE_SIZE of MMIO space.

Fixes: d8e408a827 ("drm/amdkfd: Expose HDP registers to user space")
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2024-09-04 13:23:38 +02:00

..

drm

drm/amdkfd: don't allow mapping the MMIO HDP page with large pages

2024-09-04 13:23:38 +02:00

host1x

gpu: host1x: Do not setup DMA for virtual devices

2024-05-17 11:50:54 +02:00

ipu-v3

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trace

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vga

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Makefile

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