From efe0f34c2bd037a0b01465323d52a7bbd8b5e888 Mon Sep 17 00:00:00 2001 From: Felix Kuehling Date: Tue, 30 Jan 2024 14:34:41 -0500 Subject: drm/amdgpu: Reduce VA_RESERVED_BOTTOM to 64KB MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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. Reviewed-by: Christian König Signed-off-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') 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) -- cgit v1.2.3