drm/amdgpu: limit block size to one page

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>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4bf9805b7028..abb51bd77ca7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -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 */