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

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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: Christian König <christian.koenig@amd.com>
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2022-06-01 19:02:45 -04:00 committed by Alex Deucher
parent 371017309a
commit 4d1e5f12b7
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -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;
@ -706,8 +710,8 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
if (r)
goto error;
/* vm_flush_needed after updating PDEs */
atomic64_inc(&vm->tlb_seq);
if (flush_tlb_needed)
atomic64_inc(&vm->tlb_seq);
while (!list_empty(&vm->relocated)) {
entry = list_first_entry(&vm->relocated,