Re: [PATCH 01/10] drm/ttm: Make LRU removal optional.

[zhoucm1 <zhoucm1-5C7GfCeVMHo@public.gmane.org>]

On 2019年05月22日 20:59, Christian König wrote:
> [CAUTION: External Email]
>
> We are already doing this for DMA-buf imports and also for
> amdgpu VM BOs for quite a while now.
>
> If this doesn't run into any problems we are probably going
> to stop removing BOs from the LRU altogether.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>   .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  |  9 +++++----
>   drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c        |  2 +-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c       |  2 +-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c       |  4 ++--
>   drivers/gpu/drm/qxl/qxl_release.c             |  2 +-
>   drivers/gpu/drm/radeon/radeon_gem.c           |  2 +-
>   drivers/gpu/drm/radeon/radeon_object.c        |  2 +-
>   drivers/gpu/drm/ttm/ttm_execbuf_util.c        | 20 +++++++++++--------
>   drivers/gpu/drm/virtio/virtgpu_ioctl.c        |  2 +-
>   drivers/gpu/drm/vmwgfx/vmwgfx_resource.c      |  3 ++-
>   drivers/gpu/drm/vmwgfx/vmwgfx_validation.h    |  2 +-
>   include/drm/ttm/ttm_bo_driver.h               |  5 ++++-
>   include/drm/ttm/ttm_execbuf_util.h            |  3 ++-
>   13 files changed, 34 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index e1cae4a37113..647e18f9e136 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -574,7 +574,7 @@ static int reserve_bo_and_vm(struct kgd_mem *mem,
>          amdgpu_vm_get_pd_bo(vm, &ctx->list, &ctx->vm_pd[0]);
>
>          ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
> -                                    false, &ctx->duplicates);
> +                                    false, &ctx->duplicates, true);
>          if (!ret)
>                  ctx->reserved = true;
>          else {
> @@ -647,7 +647,7 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
>          }
>
>          ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
> -                                    false, &ctx->duplicates);
> +                                    false, &ctx->duplicates, true);
>          if (!ret)
>                  ctx->reserved = true;
>          else
> @@ -1800,7 +1800,8 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
>          }
>
>          /* Reserve all BOs and page tables for validation */
> -       ret = ttm_eu_reserve_buffers(&ticket, &resv_list, false, &duplicates);
> +       ret = ttm_eu_reserve_buffers(&ticket, &resv_list, false, &duplicates,
> +                                    true);
>          WARN(!list_empty(&duplicates), "Duplicates should be empty");
>          if (ret)
>                  goto out_free;
> @@ -2006,7 +2007,7 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
>          }
>
>          ret = ttm_eu_reserve_buffers(&ctx.ticket, &ctx.list,
> -                                    false, &duplicate_save);
> +                                    false, &duplicate_save, true);
>          if (ret) {
>                  pr_debug("Memory eviction: TTM Reserve Failed. Try again\n");
>                  goto ttm_reserve_fail;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index d72cc583ebd1..fff558cf385b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -648,7 +648,7 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
>          }
>
>          r = ttm_eu_reserve_buffers(&p->ticket, &p->validated, true,
> -                                  &duplicates);
> +                                  &duplicates, true);
>          if (unlikely(r != 0)) {
>                  if (r != -ERESTARTSYS)
>                          DRM_ERROR("ttm_eu_reserve_buffers failed.\n");
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> index 54dd02a898b9..06f83cac0d3a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> @@ -79,7 +79,7 @@ int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>          list_add(&csa_tv.head, &list);
>          amdgpu_vm_get_pd_bo(vm, &list, &pd);
>
> -       r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL);
> +       r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL, true);
>          if (r) {
>                  DRM_ERROR("failed to reserve CSA,PD BOs: err=%d\n", r);
>                  return r;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index 7b840367004c..d513a5ad03dd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -171,7 +171,7 @@ void amdgpu_gem_object_close(struct drm_gem_object *obj,
>
>          amdgpu_vm_get_pd_bo(vm, &list, &vm_pd);
>
> -       r = ttm_eu_reserve_buffers(&ticket, &list, false, &duplicates);
> +       r = ttm_eu_reserve_buffers(&ticket, &list, false, &duplicates, true);
>          if (r) {
>                  dev_err(adev->dev, "leaking bo va because "
>                          "we fail to reserve bo (%d)\n", r);
> @@ -608,7 +608,7 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
>
>          amdgpu_vm_get_pd_bo(&fpriv->vm, &list, &vm_pd);
>
> -       r = ttm_eu_reserve_buffers(&ticket, &list, true, &duplicates);
> +       r = ttm_eu_reserve_buffers(&ticket, &list, true, &duplicates, true);
>          if (r)
>                  goto error_unref;
>
> diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
> index 30f85f0130cb..49f9a9385393 100644
> --- a/drivers/gpu/drm/qxl/qxl_release.c
> +++ b/drivers/gpu/drm/qxl/qxl_release.c
> @@ -256,7 +256,7 @@ int qxl_release_reserve_list(struct qxl_release *release, bool no_intr)
>                  return 0;
>
>          ret = ttm_eu_reserve_buffers(&release->ticket, &release->bos,
> -                                    !no_intr, NULL);
> +                                    !no_intr, NULL, true);
>          if (ret)
>                  return ret;
>
> diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
> index 44617dec8183..7411e69e2712 100644
> --- a/drivers/gpu/drm/radeon/radeon_gem.c
> +++ b/drivers/gpu/drm/radeon/radeon_gem.c
> @@ -559,7 +559,7 @@ static void radeon_gem_va_update_vm(struct radeon_device *rdev,
>          if (!vm_bos)
>                  return;
>
> -       r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL);
> +       r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL, true);
>          if (r)
>                  goto error_free;
>
> diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
> index 833e909706a9..36683de0300b 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.c
> +++ b/drivers/gpu/drm/radeon/radeon_object.c
> @@ -539,7 +539,7 @@ int radeon_bo_list_validate(struct radeon_device *rdev,
>          u64 bytes_moved_threshold = radeon_bo_get_threshold_for_moves(rdev);
>
>          INIT_LIST_HEAD(&duplicates);
> -       r = ttm_eu_reserve_buffers(ticket, head, true, &duplicates);
> +       r = ttm_eu_reserve_buffers(ticket, head, true, &duplicates, true);
>          if (unlikely(r != 0)) {
>                  return r;
>          }
> diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> index 0075eb9a0b52..957ec375a4ba 100644
> --- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> @@ -69,7 +69,8 @@ void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
>          list_for_each_entry(entry, list, head) {
>                  struct ttm_buffer_object *bo = entry->bo;
>
> -               ttm_bo_add_to_lru(bo);
> +               if (list_empty(&bo->lru))
> +                       ttm_bo_add_to_lru(bo);
>                  reservation_object_unlock(bo->resv);
>          }
>          spin_unlock(&glob->lru_lock);
> @@ -93,7 +94,7 @@ EXPORT_SYMBOL(ttm_eu_backoff_reservation);
>
>   int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
>                             struct list_head *list, bool intr,
> -                          struct list_head *dups)
> +                          struct list_head *dups, bool del_lru)
>   {
>          struct ttm_bo_global *glob;
>          struct ttm_validate_buffer *entry;
> @@ -172,11 +173,11 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
>                  list_add(&entry->head, list);
>          }
>
> -       if (ticket)
> -               ww_acquire_done(ticket);
> -       spin_lock(&glob->lru_lock);
> -       ttm_eu_del_from_lru_locked(list);
> -       spin_unlock(&glob->lru_lock);
> +       if (del_lru) {
> +               spin_lock(&glob->lru_lock);
> +               ttm_eu_del_from_lru_locked(list);
> +               spin_unlock(&glob->lru_lock);
> +       }
>          return 0;
>   }
>   EXPORT_SYMBOL(ttm_eu_reserve_buffers);
> @@ -203,7 +204,10 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
>                          reservation_object_add_shared_fence(bo->resv, fence);
>                  else
>                          reservation_object_add_excl_fence(bo->resv, fence);
> -               ttm_bo_add_to_lru(bo);
> +               if (list_empty(&bo->lru))
> +                       ttm_bo_add_to_lru(bo);
> +               else
> +                       ttm_bo_move_to_lru_tail(bo, NULL);
can ttm_bo_move_to_lru_tail be moved to ttm_eu_reserve_buffers when 
del_lru is false?

-David

>                  reservation_object_unlock(bo->resv);
>          }
>          spin_unlock(&glob->lru_lock);
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index 161b80fee492..5cffaa24259f 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -63,7 +63,7 @@ static int virtio_gpu_object_list_validate(struct ww_acquire_ctx *ticket,
>          struct virtio_gpu_object *qobj;
>          int ret;
>
> -       ret = ttm_eu_reserve_buffers(ticket, head, true, NULL);
> +       ret = ttm_eu_reserve_buffers(ticket, head, true, NULL, true);
>          if (ret != 0)
>                  return ret;
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> index a7c30e567f09..d28cbedba0b5 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> @@ -465,7 +465,8 @@ vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
>          val_buf->bo = &res->backup->base;
>          val_buf->num_shared = 0;
>          list_add_tail(&val_buf->head, &val_list);
> -       ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL);
> +       ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL,
> +                                    true);
>          if (unlikely(ret != 0))
>                  goto out_no_reserve;
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> index 3b396fea40d7..ac435b51f4eb 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> @@ -165,7 +165,7 @@ vmw_validation_bo_reserve(struct vmw_validation_context *ctx,
>                            bool intr)
>   {
>          return ttm_eu_reserve_buffers(&ctx->ticket, &ctx->bo_list, intr,
> -                                     NULL);
> +                                     NULL, true);
>   }
>
>   /**
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index c008346c2401..fc0d995ac90d 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -769,7 +769,10 @@ static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
>   {
>          if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
>                  spin_lock(&bo->bdev->glob->lru_lock);
> -               ttm_bo_add_to_lru(bo);
> +               if (list_empty(&bo->lru))
> +                       ttm_bo_add_to_lru(bo);
> +               else
> +                       ttm_bo_move_to_lru_tail(bo, NULL);
>                  spin_unlock(&bo->bdev->glob->lru_lock);
>          }
>          reservation_object_unlock(bo->resv);
> diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h
> index 621615fa7728..7e46cc678e7e 100644
> --- a/include/drm/ttm/ttm_execbuf_util.h
> +++ b/include/drm/ttm/ttm_execbuf_util.h
> @@ -70,6 +70,7 @@ extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
>    * @list:    thread private list of ttm_validate_buffer structs.
>    * @intr:    should the wait be interruptible
>    * @dups:    [out] optional list of duplicates.
> + * @del_lru: true if BOs should be removed from the LRU.
>    *
>    * Tries to reserve bos pointed to by the list entries for validation.
>    * If the function returns 0, all buffers are marked as "unfenced",
> @@ -98,7 +99,7 @@ extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
>
>   extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
>                                    struct list_head *list, bool intr,
> -                                 struct list_head *dups);
> +                                 struct list_head *dups, bool del_lru);
>
>   /**
>    * function ttm_eu_fence_buffer_objects.
> --
> 2.17.1
>

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx