Commit 4d1e5f12 authored by Philip Yang's avatar Philip Yang Committed by Alex Deucher
Browse files

drm/amdgpu: Update PDEs flush TLB if PTB/PDB moved 



Flush TLBs when existing PDEs are updated because a PTB or PDB moved,
but avoids unnecessary TLB flushes when new PDBs or PTBs are added to
the page table, which commonly happens when memory is mapped for the
first time.

Suggested-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarPhilip Yang <Philip.Yang@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 37101730

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

+6 −2
Original line number Diff line number Diff line
@@ -679,6 +679,7 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev, 
{

	struct amdgpu_vm_update_params params;

	struct amdgpu_vm_bo_base *entry;

	bool flush_tlb_needed = false;

	int r, idx;



	if (list_empty(&vm->relocated))
@@ -697,6 +698,9 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev, 
		goto error;



	list_for_each_entry(entry, &vm->relocated, vm_status) {

		/* vm_flush_needed after updating moved PDEs */

		flush_tlb_needed |= entry->moved;



		r = amdgpu_vm_pde_update(&params, entry);

		if (r)

			goto error;
@@ -706,7 +710,7 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev, 
	if (r)

		goto error;



	/* vm_flush_needed after updating PDEs */

	if (flush_tlb_needed)

		atomic64_inc(&vm->tlb_seq);



	while (!list_empty(&vm->relocated)) {