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Message-ID: <e49d4b75-8054-42c0-a8e0-f0d8bafdeec9@amd.com>
Date: Fri, 21 Nov 2025 16:34:34 +0100
From: Christian König <christian.koenig@....com>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
Alex Deucher <alexander.deucher@....com>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 20/28] drm/amdgpu: allocate multiple clear entities
On 11/21/25 11:12, Pierre-Eric Pelloux-Prayer wrote:
> No functional change for now, as we always use entity 0.
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 51 ++++++++++++++--------
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 3 +-
> 3 files changed, 35 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 2ee48f76483d..56663e82efef 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1323,7 +1323,7 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
> goto out;
>
> r = amdgpu_fill_buffer(adev,
> - &adev->mman.clear_entity, abo, 0, &bo->base._resv,
> + &adev->mman.clear_entities[0], abo, 0, &bo->base._resv,
> &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
> if (WARN_ON(r))
> goto out;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 9024dde0c5a7..d7f041e43eca 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -2224,10 +2224,12 @@ u32 amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
> {
> struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_VRAM);
> u32 used_windows, reserved_windows;
> + u32 num_clear_entities;
> uint64_t size;
> - int r;
> + int r, i, j;
>
> - reserved_windows = 3;
> + num_clear_entities = adev->sdma.num_instances;
Actually each SDMA instance has two ring buffers.
Additional to that using adev->sdma_num_instances is a not good idea here. That should probably rather come from the copy buffer funcs.
Regards,
Christian.
> + reserved_windows = 2 + num_clear_entities;
>
> if (!adev->mman.initialized || amdgpu_in_reset(adev) ||
> adev->mman.buffer_funcs_enabled == enable || adev->gmc.is_app_apu)
> @@ -2250,21 +2252,11 @@ u32 amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
> 1, NULL);
> if (r) {
> dev_err(adev->dev,
> - "Failed setting up TTM BO move entity (%d)\n",
> + "Failed setting up TTM BO eviction entity (%d)\n",
> r);
> return 0;
> }
>
> - r = drm_sched_entity_init(&adev->mman.clear_entity.base,
> - DRM_SCHED_PRIORITY_NORMAL, &sched,
> - 1, NULL);
> - if (r) {
> - dev_err(adev->dev,
> - "Failed setting up TTM BO clear entity (%d)\n",
> - r);
> - goto error_free_entity;
> - }
> -
> r = drm_sched_entity_init(&adev->mman.move_entity.base,
> DRM_SCHED_PRIORITY_NORMAL, &sched,
> 1, NULL);
> @@ -2272,26 +2264,48 @@ u32 amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
> dev_err(adev->dev,
> "Failed setting up TTM BO move entity (%d)\n",
> r);
> - drm_sched_entity_destroy(&adev->mman.clear_entity.base);
> goto error_free_entity;
> }
>
> + adev->mman.num_clear_entities = num_clear_entities;
> + adev->mman.clear_entities = kcalloc(num_clear_entities,
> + sizeof(struct amdgpu_ttm_buffer_entity),
> + GFP_KERNEL);
> + if (!adev->mman.clear_entities)
> + goto error_free_entity;
> +
> + for (i = 0; i < num_clear_entities; i++) {
> + r = drm_sched_entity_init(&adev->mman.clear_entities[i].base,
> + DRM_SCHED_PRIORITY_NORMAL, &sched,
> + 1, NULL);
> + if (r) {
> + for (j = 0; j < i; j++)
> + drm_sched_entity_destroy(
> + &adev->mman.clear_entities[j].base);
> + kfree(adev->mman.clear_entities);
> + goto error_free_entity;
> + }
> + }
> +
> /* Statically assign GART windows to each entity. */
> used_windows = amdgpu_ttm_buffer_entity_init(&adev->mman.default_entity,
> 0, false, false);
> used_windows = amdgpu_ttm_buffer_entity_init(&adev->mman.move_entity,
> used_windows, true, true);
> - used_windows = amdgpu_ttm_buffer_entity_init(&adev->mman.clear_entity,
> - used_windows, false, true);
> + for (i = 0; i < num_clear_entities; i++)
> + used_windows = amdgpu_ttm_buffer_entity_init(&adev->mman.clear_entities[i],
> + used_windows, false, true);
> WARN_ON(used_windows != reserved_windows);
> } else {
> drm_sched_entity_destroy(&adev->mman.default_entity.base);
> - drm_sched_entity_destroy(&adev->mman.clear_entity.base);
> drm_sched_entity_destroy(&adev->mman.move_entity.base);
> + for (i = 0; i < num_clear_entities; i++)
> + drm_sched_entity_destroy(&adev->mman.clear_entities[i].base);
> /* Drop all the old fences since re-creating the scheduler entities
> * will allocate new contexts.
> */
> ttm_resource_manager_cleanup(man);
> + kfree(adev->mman.clear_entities);
> }
>
> /* this just adjusts TTM size idea, which sets lpfn to the correct value */
> @@ -2456,8 +2470,7 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_device *adev,
>
> if (!fence)
> return -EINVAL;
> -
> - entity = &adev->mman.clear_entity;
> + entity = &adev->mman.clear_entities[0];
> *fence = dma_fence_get_stub();
>
> amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index 0b3b03f43bab..250ef54a5550 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -72,8 +72,9 @@ struct amdgpu_mman {
> struct mutex gtt_window_lock;
>
> struct amdgpu_ttm_buffer_entity default_entity; /* has no gart windows */
> - struct amdgpu_ttm_buffer_entity clear_entity;
> struct amdgpu_ttm_buffer_entity move_entity;
> + struct amdgpu_ttm_buffer_entity *clear_entities;
> + u32 num_clear_entities;
>
> struct amdgpu_vram_mgr vram_mgr;
> struct amdgpu_gtt_mgr gtt_mgr;
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