The reservation is there to catch NULL pointer dereferences from the GPU. Reduce the size to 64KB to make sure that shared virtual address programming models can map all CPU-accessible virtual addresses for GPU access. This is also the default for CPU virtual address mappings as seen in /proc/sys/vm/mmap_min_addr. Signed-off-by: Felix Kuehling <felix.kuehling@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h index 666698a57192..2c4053b29bb3 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h @@ -135,10 +135,10 @@ struct amdgpu_mem_stats; #define AMDGPU_IS_MMHUB0(x) ((x) >= AMDGPU_MMHUB0_START && (x) < AMDGPU_MMHUB1_START) #define AMDGPU_IS_MMHUB1(x) ((x) >= AMDGPU_MMHUB1_START && (x) < AMDGPU_MAX_VMHUBS) -/* Reserve 2MB at top/bottom of address space for kernel use */ +/* Reserve space at top/bottom of address space for kernel use */ #define AMDGPU_VA_RESERVED_CSA_SIZE (2ULL << 20) #define AMDGPU_VA_RESERVED_SEQ64_SIZE (2ULL << 20) -#define AMDGPU_VA_RESERVED_BOTTOM (2ULL << 20) +#define AMDGPU_VA_RESERVED_BOTTOM (1ULL << 16) #define AMDGPU_VA_RESERVED_TOP (AMDGPU_VA_RESERVED_SEQ64_SIZE + \ AMDGPU_VA_RESERVED_CSA_SIZE) -- 2.34.1
