On 2018年01月02日 22:47, Christian König wrote:
> Try to lock moved BOs if it's successful we can update the
> PTEs directly to the new location.
>
> v2: rebase
>
> Signed-off-by: Christian König <christian.koe...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 3632c69f1814..c1c5ccdee783 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1697,18 +1697,31 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
> spin_lock(&vm->status_lock);
> while (!list_empty(&vm->moved)) {
> struct amdgpu_bo_va *bo_va;
> + struct reservation_object *resv;
>
> bo_va = list_first_entry(&vm->moved,
> struct amdgpu_bo_va, base.vm_status);
> spin_unlock(&vm->status_lock);
>
> + resv = bo_va->base.bo->tbo.resv;
> +
> /* Per VM BOs never need to bo cleared in the page tables */
This reminders us Per-VM-BOs need to cleared as well after we allow to
evict/swap out per-vm-bos.
Regards,
David Zhou
> - clear = bo_va->base.bo->tbo.resv != vm->root.base.bo->tbo.resv;
> + if (resv == vm->root.base.bo->tbo.resv)
> + clear = false;
> + /* Try to reserve the BO to avoid clearing its ptes */
> + else if (reservation_object_trylock(resv))
> + clear = false;
> + /* Somebody else is using the BO right now */
> + else
> + clear = true;
>
> r = amdgpu_vm_bo_update(adev, bo_va, clear);
> if (r)
> return r;
>
> + if (!clear && resv != vm->root.base.bo->tbo.resv)
> + reservation_object_unlock(resv);
> +
> spin_lock(&vm->status_lock);
> }
> spin_unlock(&vm->status_lock);
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