On 2019-03-26 4:35 p.m., Liu, Shaoyun wrote:
> Avoid unnecessary XGMI hight pstate trigger when mapping none-vram memory for
> peer device
>
> Change-Id: I1881deff3da19f1f4b58d5765db03a590092a5b2
> Signed-off-by: shaoyunl <shaoyun....@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 11 +++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
> 2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index a82c3b1..a0f56e4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -666,6 +666,8 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void
> *data,
> struct amdgpu_device *adev = dev->dev_private;
> struct drm_amdgpu_gem_op *args = data;
> struct drm_gem_object *gobj;
> + struct amdgpu_vm_bo_base *base;
> + struct amdgpu_bo_va *bo_va;
> struct amdgpu_bo *robj;
> int r;
>
> @@ -704,6 +706,15 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void
> *data,
> amdgpu_bo_unreserve(robj);
> break;
> }
> + for (base = robj->vm_bo; base; base = base->next) {
> + bo_va = container_of(base, struct amdgpu_bo_va, base);
> + if (bo_va && bo_va->is_xgmi) {
The point here is to prevent transitions where a mapping moves from
is_xgmi => !is_xgmi or from !is_xgmi => is_xgmi, because that would
potentially require a XGMI pstate change.
This check catches the case of is_xgmi => !is_xgmi, but not the other
way around. I think you should drop the is_xgmi condition here. Any BO
that's shared between multiple GPUs should return -EINVAL here because
moving it could result in an XGMI pstate change. It doesn't matter
whether it's currently using XGMI or not.
Regards,
Felix
> + r = -EINVAL;
> + amdgpu_bo_unreserve(robj);
> + goto out;
> + }
> + }
> +
> robj->preferred_domains = args->value & (AMDGPU_GEM_DOMAIN_VRAM
> |
> AMDGPU_GEM_DOMAIN_GTT |
> AMDGPU_GEM_DOMAIN_CPU);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 76eee7e..8ed23d2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2048,7 +2048,8 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct
> amdgpu_device *adev,
> INIT_LIST_HEAD(&bo_va->valids);
> INIT_LIST_HEAD(&bo_va->invalids);
>
> - if (bo && amdgpu_xgmi_same_hive(adev, amdgpu_ttm_adev(bo->tbo.bdev))) {
> + if (bo && amdgpu_xgmi_same_hive(adev, amdgpu_ttm_adev(bo->tbo.bdev)) &&
> + (bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM)) {
> bo_va->is_xgmi = true;
> mutex_lock(&adev->vm_manager.lock_pstate);
> /* Power up XGMI if it can be potentially used */
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
