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drm/amdgpu: limit block size to one page

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Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chunming Zhou 2017-03-27 11:43:35 +08:00 committed by Alex Deucher
parent a1adf8bef2
commit f7effef8d6
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -1042,6 +1042,14 @@ static bool amdgpu_check_pot_argument(int arg)
static void amdgpu_get_block_size(struct amdgpu_device *adev)
{
/* from AI, asic starts to support multiple level VMPT */
if (adev->family >= AMDGPU_FAMILY_AI) {
if (amdgpu_vm_block_size != 9)
dev_warn(adev->dev, "Multi-VMPT limits block size to"
"one page!\n");
amdgpu_vm_block_size = 9;
return;
}
/* defines number of bits in page table versus page directory,
* a page is 4KB so we have 12 bits offset, minimum 9 bits in the
* page table and the remaining bits are in the page directory */