On Thu, Aug 15, 2024 at 03:46:29PM -0400, Felix Kuehling wrote:
From: Alex Deucher alexander.deucher@amd.com
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: d8e408a82704 ("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 (cherry picked from commit 24e82654e98e96cece5d8b919c522054456eeec6)
Wrong git id, this should be be4a2a81b6b9 ("drm/amdkfd: don't allow mapping the MMIO HDP page with large pages"), right?
{sigh}