drm/amdgpu: reserve the first 2x512 pages of GART

We want to use them as remap address space.

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, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
index 1ef625550442..f46a97d91675 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -43,12 +43,15 @@ static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
                                unsigned long p_size)
 {
         struct amdgpu_gtt_mgr *mgr;
+        uint64_t start, size;
 
         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
         if (!mgr)
                 return -ENOMEM;
 
-        drm_mm_init(&mgr->mm, 0, p_size);
+        start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
+        size = p_size - start;
+        drm_mm_init(&mgr->mm, start, size);
         spin_lock_init(&mgr->lock);
         mgr->available = p_size;
         man->priv = mgr;