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drm/amdgpu: Reduce VA_RESERVED_BOTTOM to 64KB

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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 <christian.koenig@amd.com>
Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling
2024-01-30 14:34:41 -05:00
committed by Alex Deucher
parent 876fa5f8a0
commit efe0f34c2b
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
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@@ -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)