drm/amdgpu: enable eviction fence

This patch enables attachment and detachment of eviction fences.
This is just a fork of eviction fence enabling code from the first
patch of the series so that the CI testing can happen on fully
fledged code.

Cc: Alex Deucher <[email protected]>
Cc: Christian Koenig <[email protected]>
Reviewed-by: Christian Koenig <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Arvind Yadav <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c

@@ -177,6 +177,8 @@ void amdgpu_eviction_fence_destroy(struct amdgpu_eviction_fence_mgr *evf_mgr)
 	if (!ev_fence)
 		return;
 
+	dma_fence_wait(&ev_fence->base, false);
+
 	/* Last unref of ev_fence */
 	dma_fence_put(&evf_mgr->ev_fence->base);
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c

@@ -294,6 +294,13 @@ static int amdgpu_gem_object_open(struct drm_gem_object *obj,
 	else
 		++bo_va->ref_count;
 
+	/* attach gfx eviction fence */
+	r = amdgpu_eviction_fence_attach(&fpriv->evf_mgr, abo);
+	if (r) {
+		DRM_DEBUG_DRIVER("Failed to attach eviction fence to BO\n");
+		return r;
+	}
+
 	amdgpu_bo_unreserve(abo);
 
 	/* Validate and add eviction fence to DMABuf imports with dynamic
@@ -344,6 +351,9 @@ static void amdgpu_gem_object_close(struct drm_gem_object *obj,
 	struct drm_exec exec;
 	long r;
 
+	if (!amdgpu_vm_is_bo_always_valid(vm, bo))
+		amdgpu_eviction_fence_detach(&fpriv->evf_mgr, bo);
+
 	drm_exec_init(&exec, DRM_EXEC_IGNORE_DUPLICATES, 0);
 	drm_exec_until_all_locked(&exec) {
 		r = drm_exec_prepare_obj(&exec, &bo->tbo.base, 1);