[PATCH v3 1/2] drm/amdgpu: Add job fence to resv conditionally

[xinhui pan <xinhui.pan@xxxxxxx>]

Provide resv as a parameter for vm sdma commit.
Job fence on page table should be a shared one, so add it to the resv.

Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Suggested-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: xinhui pan <xinhui.pan@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c      | 4 ++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 7 +++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 73398831196f..809ca6e8f40f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1579,6 +1579,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 				       dma_addr_t *pages_addr,
 				       struct dma_fence **fence)
 {
+	struct amdgpu_bo *root = vm->root.base.bo;
 	struct amdgpu_vm_update_params params;
 	enum amdgpu_sync_mode sync_mode;
 	int r;
@@ -1604,8 +1605,6 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	}
 
 	if (flags & AMDGPU_PTE_VALID) {
-		struct amdgpu_bo *root = vm->root.base.bo;
-
 		if (!dma_fence_is_signaled(vm->last_direct))
 			amdgpu_bo_fence(root, vm->last_direct, true);
 
@@ -1613,6 +1612,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 			amdgpu_bo_fence(root, vm->last_delayed, true);
 	}
 
+	params.resv = root->tbo.base.resv;
 	r = vm->update_funcs->prepare(&params, resv, sync_mode);
 	if (r)
 		goto error_unlock;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index b5705fcfc935..ca6021b4200b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
 	 * @num_dw_left: number of dw left for the IB
 	 */
 	unsigned int num_dw_left;
+
+	/**
+	 * @resv: sync the resv and add job fence to it conditionally.
+	 */
+	struct dma_resv *resv;
 };
 
 struct amdgpu_vm_update_funcs {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
index 4cc7881f438c..a1b270a4da8e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
@@ -111,6 +111,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
 		swap(p->vm->last_delayed, tmp);
 	dma_fence_put(tmp);
 
+	/* add job fence to resv.
+	 * MM notifier path is an exception as we can not grab the
+	 * resv lock.
+	 */
+	if (!p->direct && p->resv)
+		dma_resv_add_shared_fence(p->resv, f);
+
 	if (fence && !p->direct)
 		swap(*fence, f);
 	dma_fence_put(f);
-- 
2.17.1

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