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Message-ID: <fd48d626-39db-4e83-b2ed-5b9c3f765646@amd.com>
Date: Fri, 14 Nov 2025 15:57:54 -0500
From: Felix Kuehling <felix.kuehling@....com>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
Rodrigo Siqueira <siqueira@...lia.com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/20] drm/amdgpu: use TTM_NUM_MOVE_FENCES when
reserving fences
On 2025-11-13 11:05, Pierre-Eric Pelloux-Prayer wrote:
> Use TTM_NUM_MOVE_FENCES as an upperbound of how many fences
> ttm might need to deal with moves/evictions.
>
> ---
> v2: removed drm_err calls
> ---
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Acked-by: Felix Kuehling <felix.kuehling@....com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 ++---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 6 ++----
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
> drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 +--
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 6 ++----
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c | 6 ++----
> 7 files changed, 12 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index ecdfe6cb36cc..0338522761bc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -916,9 +916,8 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
> goto out_free_user_pages;
>
> amdgpu_bo_list_for_each_entry(e, p->bo_list) {
> - /* One fence for TTM and one for each CS job */
> r = drm_exec_prepare_obj(&p->exec, &e->bo->tbo.base,
> - 1 + p->gang_size);
> + TTM_NUM_MOVE_FENCES + p->gang_size);
> drm_exec_retry_on_contention(&p->exec);
> if (unlikely(r))
> goto out_free_user_pages;
> @@ -928,7 +927,7 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,
>
> if (p->uf_bo) {
> r = drm_exec_prepare_obj(&p->exec, &p->uf_bo->tbo.base,
> - 1 + p->gang_size);
> + TTM_NUM_MOVE_FENCES + p->gang_size);
> drm_exec_retry_on_contention(&p->exec);
> if (unlikely(r))
> goto out_free_user_pages;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index ce073e894584..2fe6899f6344 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -353,7 +353,7 @@ static void amdgpu_gem_object_close(struct drm_gem_object *obj,
>
> drm_exec_init(&exec, DRM_EXEC_IGNORE_DUPLICATES, 0);
> drm_exec_until_all_locked(&exec) {
> - r = drm_exec_prepare_obj(&exec, &bo->tbo.base, 1);
> + r = drm_exec_prepare_obj(&exec, &bo->tbo.base, TTM_NUM_MOVE_FENCES);
> drm_exec_retry_on_contention(&exec);
> if (unlikely(r))
> goto out_unlock;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> index 79bad9cbe2ab..b92561eea3da 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
> @@ -326,11 +326,9 @@ static int amdgpu_vkms_prepare_fb(struct drm_plane *plane,
> return r;
> }
>
> - r = dma_resv_reserve_fences(rbo->tbo.base.resv, 1);
> - if (r) {
> - dev_err(adev->dev, "allocating fence slot failed (%d)\n", r);
> + r = dma_resv_reserve_fences(rbo->tbo.base.resv, TTM_NUM_MOVE_FENCES);
> + if (r)
> goto error_unlock;
> - }
>
> if (plane->type != DRM_PLANE_TYPE_CURSOR)
> domain = amdgpu_display_supported_domains(adev, rbo->flags);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 2f8e83f840a8..aaa44199e9f4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2630,7 +2630,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> }
>
> amdgpu_vm_bo_base_init(&vm->root, vm, root_bo);
> - r = dma_resv_reserve_fences(root_bo->tbo.base.resv, 1);
> + r = dma_resv_reserve_fences(root_bo->tbo.base.resv,
> + TTM_NUM_MOVE_FENCES);
> if (r)
> goto error_free_root;
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> index ffb7b36e577c..968cef1cbea6 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> @@ -627,9 +627,8 @@ svm_range_vram_node_new(struct kfd_node *node, struct svm_range *prange,
> }
> }
>
> - r = dma_resv_reserve_fences(bo->tbo.base.resv, 1);
> + r = dma_resv_reserve_fences(bo->tbo.base.resv, TTM_NUM_MOVE_FENCES);
> if (r) {
> - pr_debug("failed %d to reserve bo\n", r);
> amdgpu_bo_unreserve(bo);
> goto reserve_bo_failed;
> }
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> index 56cb866ac6f8..ceb55dd183ed 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
> @@ -952,11 +952,9 @@ static int amdgpu_dm_plane_helper_prepare_fb(struct drm_plane *plane,
> return r;
> }
>
> - r = dma_resv_reserve_fences(rbo->tbo.base.resv, 1);
> - if (r) {
> - drm_err(adev_to_drm(adev), "reserving fence slot failed (%d)\n", r);
> + r = dma_resv_reserve_fences(rbo->tbo.base.resv, TTM_NUM_MOVE_FENCES);
> + if (r)
> goto error_unlock;
> - }
>
> if (plane->type != DRM_PLANE_TYPE_CURSOR)
> domain = amdgpu_display_supported_domains(adev, rbo->flags);
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
> index d9527c05fc87..110f0173eee6 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_wb.c
> @@ -106,11 +106,9 @@ static int amdgpu_dm_wb_prepare_job(struct drm_writeback_connector *wb_connector
> return r;
> }
>
> - r = dma_resv_reserve_fences(rbo->tbo.base.resv, 1);
> - if (r) {
> - drm_err(adev_to_drm(adev), "reserving fence slot failed (%d)\n", r);
> + r = dma_resv_reserve_fences(rbo->tbo.base.resv, TTM_NUM_MOVE_FENCES);
> + if (r)
> goto error_unlock;
> - }
>
> domain = amdgpu_display_supported_domains(adev, rbo->flags);
>
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