[PATCH 09/10] drm/amdgpu: sync gart table before initialization completed

[David1.Zhou@xxxxxxx (Chunming Zhou)]

Since the shadow is in GTT, shadow itslef pte isn't in shadow,
We need to do sync before initialization is completed

Change-Id: I29b433da6c71fc790a32ef202dd85a72ab6b5787
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 47 +++++++++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 3ee01fe..4cad4b2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -648,6 +648,7 @@ struct amdgpu_gart {
 	bool				ready;
 	const struct amdgpu_gart_funcs *gart_funcs;
 	struct amd_sched_entity         recover_entity;
+	u64                             shadow_gpu_addr;
 };
 
 int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index baeaee2..e99c8a3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -421,10 +421,46 @@ int amdgpu_gart_table_vram_shadow_pin(struct amdgpu_device *adev)
 	r = amdgpu_bo_kmap(adev->gart.robj->shadow, &adev->gart.shadow_ptr);
 	if (r)
 		amdgpu_bo_unpin(adev->gart.robj->shadow);
+	adev->gart.shadow_gpu_addr = gpu_addr;
 	amdgpu_bo_unreserve(adev->gart.robj->shadow);
 	return r;
 }
 
+/* Since the shadow is in GTT, shadow itslef pte isn't in shadow,
+   We need to do sync before initialization is completed */
+static int amdgpu_gart_table_shadow_sync(struct amdgpu_device *adev)
+{
+	struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+	struct amd_sched_entity *entity = &adev->gart.recover_entity;
+	struct fence *fence;
+	u64 vram_addr = adev->gart.table_addr;
+	u64 shadow_addr = adev->gart.shadow_gpu_addr;
+	int r;
+
+	if (!adev->gart.ready) {
+		DRM_ERROR("cannot sync gart table for shadow.\n");
+		return -EINVAL;
+	}
+	if (!amdgpu_vm_need_backup(adev) || !adev->gart.robj ||
+	    !adev->gart.robj->shadow)
+		return 0;
+	r = amdgpu_bo_reserve(adev->gart.robj->shadow, false);
+	if (unlikely(r != 0))
+		return r;
+	/* if adev->gart.ready, means both gart bo and shadow bo are pinned */
+	r = amdgpu_copy_buffer(ring, entity, vram_addr,
+			       shadow_addr, amdgpu_bo_size(adev->gart.robj),
+			       adev->gart.robj->tbo.resv, &fence);
+	if (!r)
+		amdgpu_bo_fence(adev->gart.robj, fence, true);
+
+	amdgpu_bo_unreserve(adev->gart.robj->shadow);
+	r = fence_wait(fence, true);
+	fence_put(fence);
+
+	return r;
+}
+
 void amdgpu_gart_table_vram_shadow_unpin(struct amdgpu_device *adev)
 {
 	int r;
@@ -445,10 +481,19 @@ int amdgpu_gart_late_init(struct amdgpu_device *adev)
 {
 	struct amd_sched_rq *rq;
 	struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+	int r;
 
 	rq = &ring->sched.sched_rq[AMD_SCHED_PRIORITY_RECOVER];
-	return amd_sched_entity_init(&ring->sched, &adev->gart.recover_entity,
+	r = amd_sched_entity_init(&ring->sched, &adev->gart.recover_entity,
 				     rq, amdgpu_sched_jobs);
+	if (r)
+		return r;
+	r = amdgpu_gart_table_shadow_sync(adev);
+	if (r) {
+		DRM_ERROR("sync gart table failed (%d).\n", r);
+		amd_sched_entity_fini(&ring->sched, &adev->gart.recover_entity);
+	}
+	return r;
 }
 
 void amdgpu_gart_late_fini(struct amdgpu_device *adev)
-- 
1.9.1