swiotlb expands our card accessing range, but its path always is slower
than ttm pool allocation.
So add condition to use it.
v2: move a bit later

Change-Id: I1802645833155a9cd808913f863981173a82145f
Signed-off-by: Chunming Zhou <david1.z...@amd.com>
Reviewed-by: Monk Liu <monk....@amd.com>
---
 drivers/gpu/drm/radeon/radeon.h        | 1 +
 drivers/gpu/drm/radeon/radeon_device.c | 2 ++
 drivers/gpu/drm/radeon/radeon_ttm.c    | 6 +++---
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index d34887873dea..4a2eb409aacc 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -2387,6 +2387,7 @@ struct radeon_device {
        struct radeon_dummy_page        dummy_page;
        bool                            shutdown;
        bool                            need_dma32;
+       bool                            need_swiotlb;
        bool                            accel_working;
        bool                            fastfb_working; /* IGP feature*/
        bool                            needs_reset, in_reset;
diff --git a/drivers/gpu/drm/radeon/radeon_device.c 
b/drivers/gpu/drm/radeon/radeon_device.c
index 8d3e3d2e0090..7f40c6f7c4dd 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -29,6 +29,7 @@
 #include <linux/slab.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_cache.h>
 #include <drm/radeon_drm.h>
 #include <linux/pm_runtime.h>
 #include <linux/vgaarb.h>
@@ -1378,6 +1379,7 @@ int radeon_device_init(struct radeon_device *rdev,
                pci_set_consistent_dma_mask(rdev->pdev, DMA_BIT_MASK(32));
                pr_warn("radeon: No coherent DMA available\n");
        }
+       rdev->need_swiotlb = drm_get_max_iomem() > ((u64)1 << dma_bits);
 
        /* Registers mapping */
        /* TODO: block userspace mapping of io register */
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c 
b/drivers/gpu/drm/radeon/radeon_ttm.c
index a0a839bc39bf..c1e3862a48a4 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -756,7 +756,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm,
 #endif
 
 #ifdef CONFIG_SWIOTLB
-       if (swiotlb_nr_tbl()) {
+       if (rdev->need_swiotlb && swiotlb_nr_tbl()) {
                return ttm_dma_populate(&gtt->ttm, rdev->dev, ctx);
        }
 #endif
@@ -788,7 +788,7 @@ static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm)
 #endif
 
 #ifdef CONFIG_SWIOTLB
-       if (swiotlb_nr_tbl()) {
+       if (rdev->need_swiotlb && swiotlb_nr_tbl()) {
                ttm_dma_unpopulate(&gtt->ttm, rdev->dev);
                return;
        }
@@ -1155,7 +1155,7 @@ static int radeon_ttm_debugfs_init(struct radeon_device 
*rdev)
        count = ARRAY_SIZE(radeon_ttm_debugfs_list);
 
 #ifdef CONFIG_SWIOTLB
-       if (!swiotlb_nr_tbl())
+       if (!(rdev->need_swiotlb && swiotlb_nr_tbl()))
                --count;
 #endif
 
-- 
2.14.1

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