[PATCH] drm/amd/amdgpu: Avoid writing GMC registers under sriov in gmc9

[YuBiao Wang <YuBiao.Wang@xxxxxxx>]

[Why]
For Vega10, disabling gart of gfxhub and mmhub could mess up KIQ and PSP under sriov mode, and lead to DMAR on host side.

[How]
Do not call gmc_gart_disable under sriov but keep vram_unpin to avoid
pin_count leak.

Signed-off-by: YuBiao Wang <YuBiao.Wang@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index cb82404df534..365059a20ae8 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1793,14 +1793,13 @@ static void gmc_v9_0_gart_disable(struct amdgpu_device *adev)
 {
 	adev->gfxhub.funcs->gart_disable(adev);
 	adev->mmhub.funcs->gart_disable(adev);
-	amdgpu_gart_table_vram_unpin(adev);
 }
 
 static int gmc_v9_0_hw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	gmc_v9_0_gart_disable(adev);
+	amdgpu_gart_table_vram_unpin(adev);
 
 	if (amdgpu_sriov_vf(adev)) {
 		/* full access mode, so don't touch any GMC register */
@@ -1808,6 +1807,7 @@ static int gmc_v9_0_hw_fini(void *handle)
 		return 0;
 	}
 
+	gmc_v9_0_gart_disable(adev);
 	amdgpu_irq_put(adev, &adev->gmc.ecc_irq, 0);
 	amdgpu_irq_put(adev, &adev->gmc.vm_fault, 0);
 
-- 
2.25.1