drm/amdgpu: use 2MB fragment size for GFX6,7 and 8

Use 2MB fragment size by default for older hardware generations as well.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Acked-by: NJohn Bridgman <john.bridgman@amd.com>
Reviewed-by: NRoger He <Hongbo.He@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c

@@ -831,7 +831,7 @@ static int gmc_v6_0_sw_init(void *handle)
 	if (r)
 		return r;
 
-	amdgpu_vm_adjust_size(adev, 64, 4);
+	amdgpu_vm_adjust_size(adev, 64, 9);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
 	adev->mc.mc_mask = 0xffffffffffULL;

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

@@ -970,7 +970,7 @@ static int gmc_v7_0_sw_init(void *handle)
 	 * Currently set to 4GB ((1 << 20) 4k pages).
 	 * Max GPUVM size for cayman and SI is 40 bits.
 	 */
-	amdgpu_vm_adjust_size(adev, 64, 4);
+	amdgpu_vm_adjust_size(adev, 64, 9);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
 	/* Set the internal MC address mask

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -1067,7 +1067,7 @@ static int gmc_v8_0_sw_init(void *handle)
 	 * Currently set to 4GB ((1 << 20) 4k pages).
 	 * Max GPUVM size for cayman and SI is 40 bits.
 	 */
-	amdgpu_vm_adjust_size(adev, 64, 4);
+	amdgpu_vm_adjust_size(adev, 64, 9);
 	adev->vm_manager.max_pfn = adev->vm_manager.vm_size << 18;
 
 	/* Set the internal MC address mask