drm/amdgpu/gmc8: switch to using amdgpu_gmc_get_vbios_allocations

The new helper centralizes the logic in one place.
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1094,9 +1094,7 @@ static unsigned gmc_v8_0_get_vbios_fb_size(struct amdgpu_device *adev)
 			REG_GET_FIELD(viewport, VIEWPORT_SIZE, VIEWPORT_WIDTH) *
 			4);
 	}
-	/* return 0 if the pre-OS buffer uses up most of vram */
-	if ((adev->gmc.real_vram_size - size) < (8 * 1024 * 1024))
-		return 0;
+
 	return size;
 }
 
@@ -1160,7 +1158,7 @@ static int gmc_v8_0_sw_init(void *handle)
 	if (r)
 		return r;
 
-	adev->gmc.stolen_vga_size = gmc_v8_0_get_vbios_fb_size(adev);
+	amdgpu_gmc_get_vbios_allocations(adev);
 
 	/* Memory manager */
 	r = amdgpu_bo_init(adev);
@@ -1739,7 +1737,8 @@ static const struct amdgpu_gmc_funcs gmc_v8_0_gmc_funcs = {
 	.emit_pasid_mapping = gmc_v8_0_emit_pasid_mapping,
 	.set_prt = gmc_v8_0_set_prt,
 	.get_vm_pde = gmc_v8_0_get_vm_pde,
-	.get_vm_pte = gmc_v8_0_get_vm_pte
+	.get_vm_pte = gmc_v8_0_get_vm_pte,
+	.get_vbios_fb_size = gmc_v8_0_get_vbios_fb_size,
 };
 
 static const struct amdgpu_irq_src_funcs gmc_v8_0_irq_funcs = {