[PATCH 2/4] drm/amdkfd: Signal page table fence after KFD flush tlb

[Philip Yang <Philip.Yang@amd.com>]

To free page table BOs which are freed when updating page table, for
example PTE BOs when PDE0 used as PTE.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index af0a4b5257cc..0ff007a74d03 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -2101,6 +2101,11 @@ void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
 			amdgpu_amdkfd_flush_gpu_tlb_pasid(
 				dev->adev, pdd->process->pasid, type, xcc);
 	}
+
+	/* Signal page table fence to free page table BOs */
+	dma_fence_signal(vm->pt_fence);
+	dma_fence_put(vm->pt_fence);
+	vm->pt_fence = amdgpu_pt_fence_create();
 }
 
 struct kfd_process_device *kfd_process_device_data_by_id(struct kfd_process *p, uint32_t gpu_id)
-- 
2.35.1