drm/amdgpu: cleanup initializing gtt_size

Stop spreading the code over all GMC generations.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index a57abc1a25fb..982b1cc11dac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -55,6 +55,26 @@
 /*
  * Common GART table functions.
  */
+
+/**
+ * amdgpu_gart_set_defaults - set the default gtt_size
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Set the default gtt_size based on parameters and available VRAM.
+ */
+void amdgpu_gart_set_defaults(struct amdgpu_device *adev)
+{
+        /* unless the user had overridden it, set the gart
+         * size equal to the 1024 or vram, whichever is larger.
+         */
+        if (amdgpu_gart_size == -1)
+                adev->mc.gtt_size = max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20),
+                                        adev->mc.mc_vram_size);
+        else
+                adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
+}
+
 /**
  * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
  *