[PATCH 12/15] drm/amdgpu: limit block size to one page

[Chunming Zhou]

Change-Id: I00ff5d2c7ff29563394cb8af4c57780b91876743
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7bad6b6..4041d72 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1079,6 +1079,14 @@ 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 */
-- 
1.9.1