[PATCH 1/1] drm/amdgpu: recover gart table at resume

[Nirmoy Das <nirmoy.das@xxxxxxx>]

Get rid off pin/unpin and evict and swap back gart
page table which should make things less likely to break.

Also remove 2nd call to amdgpu_device_evict_resources()
as we don't need it.

Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  5 -----
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c     | 16 ++++++++++++----
 drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c      | 17 +++++++++++++----
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c      | 16 ++++++++++++----
 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 41ce86244144..22ff229ab981 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3941,11 +3941,6 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
 	amdgpu_fence_driver_hw_fini(adev);
 
 	amdgpu_device_ip_suspend_phase2(adev);
-	/* This second call to evict device resources is to evict
-	 * the gart page table using the CPU.
-	 */
-	amdgpu_device_evict_resources(adev);
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 3ec5ff5a6dbe..18e3f3c5aae6 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -992,9 +992,16 @@ static int gmc_v10_0_gart_enable(struct amdgpu_device *adev)
 		return -EINVAL;
 	}
 
-	r = amdgpu_gart_table_vram_pin(adev);
-	if (r)
-		return r;
+	if (!adev->in_suspend) {
+		r = amdgpu_gart_table_vram_pin(adev);
+		if (r)
+			return r;
+	} else {
+		r = amdgpu_gtt_mgr_recover(ttm_manager_type(&adev->mman.bdev,
+							    TTM_PL_TT));
+		if (r)
+			return r;
+	}
 
 	r = adev->gfxhub.funcs->gart_enable(adev);
 	if (r)
@@ -1062,7 +1069,8 @@ static void gmc_v10_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);
+	if (!adev->in_suspend)
+		amdgpu_gart_table_vram_unpin(adev);
 }
 
 static int gmc_v10_0_hw_fini(void *handle)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 492ebed2915b..0ef50ad3d7d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -837,9 +837,17 @@ static int gmc_v8_0_gart_enable(struct amdgpu_device *adev)
 		dev_err(adev->dev, "No VRAM object for PCIE GART.\n");
 		return -EINVAL;
 	}
-	r = amdgpu_gart_table_vram_pin(adev);
-	if (r)
-		return r;
+
+	if (!adev->in_suspend) {
+		r = amdgpu_gart_table_vram_pin(adev);
+		if (r)
+			return r;
+	} else {
+		r = amdgpu_gtt_mgr_recover(ttm_manager_type(&adev->mman.bdev,
+							    TTM_PL_TT));
+		if (r)
+			return r;
+	}
 
 	table_addr = amdgpu_bo_gpu_offset(adev->gart.bo);
 
@@ -992,7 +1000,8 @@ static void gmc_v8_0_gart_disable(struct amdgpu_device *adev)
 	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL, ENABLE_L2_CACHE, 0);
 	WREG32(mmVM_L2_CNTL, tmp);
 	WREG32(mmVM_L2_CNTL2, 0);
-	amdgpu_gart_table_vram_unpin(adev);
+	if (!adev->in_suspend)
+		amdgpu_gart_table_vram_unpin(adev);
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index cb82404df534..1bbcefd53974 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1714,9 +1714,16 @@ static int gmc_v9_0_gart_enable(struct amdgpu_device *adev)
 		return -EINVAL;
 	}
 
-	r = amdgpu_gart_table_vram_pin(adev);
-	if (r)
-		return r;
+	if (!adev->in_suspend) {
+		r = amdgpu_gart_table_vram_pin(adev);
+		if (r)
+			return r;
+	} else {
+		r = amdgpu_gtt_mgr_recover(ttm_manager_type(&adev->mman.bdev,
+							    TTM_PL_TT));
+		if (r)
+			return r;
+	}
 
 	r = adev->gfxhub.funcs->gart_enable(adev);
 	if (r)
@@ -1793,7 +1800,8 @@ 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);
+	if (!adev->in_suspend)
+		amdgpu_gart_table_vram_unpin(adev);
 }
 
 static int gmc_v9_0_hw_fini(void *handle)
-- 
2.32.0