[PATCH 126/159] drm/amdgpu: Don't reserve vram as WC for A+A

[Alex Deucher]

From: Oak Zeng <Oak.Zeng at amd.com>

On A+A platform, vram can be mapped as WB. Not necessarily
to always map vram as WC on such platform.

Calling function arch_io_reserve_memtype_wc will mark the
whole vram region as WC. So don't call it for A+A platform.

Signed-off-by: Oak Zeng <Oak.Zeng at amd.com>
Suggested-by: Alex Deucher <alexander.deucher at amd.com>
Acked-by: Christian Konig <christian.koenig at amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index c02e28c0683d..8353afb62ed4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1086,13 +1086,17 @@ static const char *amdgpu_vram_names[] = {
  */
 int amdgpu_bo_init(struct amdgpu_device *adev)
 {
-	/* reserve PAT memory space to WC for VRAM */
-	arch_io_reserve_memtype_wc(adev->gmc.aper_base,
-				   adev->gmc.aper_size);
+	/* On A+A platform, VRAM can be mapped as WB */
+	if (!adev->gmc.xgmi.connected_to_cpu) {
+		/* reserve PAT memory space to WC for VRAM */
+		arch_io_reserve_memtype_wc(adev->gmc.aper_base,
+				adev->gmc.aper_size);
+
+		/* Add an MTRR for the VRAM */
+		adev->gmc.vram_mtrr = arch_phys_wc_add(adev->gmc.aper_base,
+				adev->gmc.aper_size);
+	}
 
-	/* Add an MTRR for the VRAM */
-	adev->gmc.vram_mtrr = arch_phys_wc_add(adev->gmc.aper_base,
-					      adev->gmc.aper_size);
 	DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n",
 		 adev->gmc.mc_vram_size >> 20,
 		 (unsigned long long)adev->gmc.aper_size >> 20);
@@ -1110,8 +1114,10 @@ int amdgpu_bo_init(struct amdgpu_device *adev)
 void amdgpu_bo_fini(struct amdgpu_device *adev)
 {
 	amdgpu_ttm_fini(adev);
-	arch_phys_wc_del(adev->gmc.vram_mtrr);
-	arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size);
+	if (!adev->gmc.xgmi.connected_to_cpu) {
+		arch_phys_wc_del(adev->gmc.vram_mtrr);
+		arch_io_free_memtype_wc(adev->gmc.aper_base, adev->gmc.aper_size);
+	}
 }
 
 /**
-- 
2.29.2