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

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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

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Alex Deucher 2024-04-14 13:06:39 -04:00

parent 2b3b9d2150

commit 24e82654e9

1 changed files with 5 additions and 2 deletions

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7

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

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