[PATCH] drm/amdgpu: improve GTT BO alloc speed in OGL

[Alex Deucher]

From: "monk.liu" <monk....@amd.com>

original we use ttm_dma path to allocate GTT bo, which is too much
slower than the path of ttm_pool, in most cases.

The swiotlb checks don't seem to work and we always end up in the
slow path even when an IOMMU is available.

Signed-off-by: monk.liu <Monk.Liu at amd.com>
Reviewed-by: Jammy Zhou <jammy.zhou at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 3beb10b..e2fcd39 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -783,12 +783,6 @@ static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)

        adev = amdgpu_get_adev(ttm->bdev);

-#ifdef CONFIG_SWIOTLB
-       if (swiotlb_nr_tbl()) {
-               return ttm_dma_populate(&gtt->ttm, adev->dev);
-       }
-#endif
-
        r = ttm_pool_populate(ttm);
        if (r) {
                return r;
@@ -829,13 +823,6 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)

        adev = amdgpu_get_adev(ttm->bdev);

-#ifdef CONFIG_SWIOTLB
-       if (swiotlb_nr_tbl()) {
-               ttm_dma_unpopulate(&gtt->ttm, adev->dev);
-               return;
-       }
-#endif
-
        for (i = 0; i < ttm->num_pages; i++) {
                if (gtt->ttm.dma_address[i]) {
                        pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
-- 
2.5.5