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Message-ID: <6469a0ce-89d9-42ad-867b-1d8094293e44@amd.com>
Date: Fri, 14 Nov 2025 14:07:45 +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>, Felix Kuehling <Felix.Kuehling@....com>,
Sumit Semwal <sumit.semwal@...aro.org>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2 05/20] drm/amdgpu: pass the entity to use to ttm
functions
On 11/13/25 17:05, Pierre-Eric Pelloux-Prayer wrote:
> This way the caller can select the one it wants to use.
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c | 3 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 75 +++++++++++--------
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 16 ++--
> drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 3 +-
> 5 files changed, 60 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
> index 02c2479a8840..b59040a8771f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
> @@ -38,7 +38,8 @@ static int amdgpu_benchmark_do_move(struct amdgpu_device *adev, unsigned size,
> stime = ktime_get();
> for (i = 0; i < n; i++) {
> struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
> - r = amdgpu_copy_buffer(ring, saddr, daddr, size, NULL, &fence,
> + r = amdgpu_copy_buffer(ring, &adev->mman.default_entity.base,
> + saddr, daddr, size, NULL, &fence,
> false, 0);
> if (r)
> goto exit_do_move;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index e08f58de4b17..c06c132a753c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1321,8 +1321,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
> if (r)
> goto out;
>
> - r = amdgpu_fill_buffer(abo, 0, &bo->base._resv, &fence, true,
> - AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
> + r = amdgpu_fill_buffer(&adev->mman.clear_entity, 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 42d448cd6a6d..c8d59ca2b3bd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -164,6 +164,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
>
> /**
> * amdgpu_ttm_map_buffer - Map memory into the GART windows
> + * @entity: entity to run the window setup job
> * @bo: buffer object to map
> * @mem: memory object to map
> * @mm_cur: range to map
> @@ -176,7 +177,8 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
> * Setup one of the GART windows to access a specific piece of memory or return
> * the physical address for local memory.
> */
> -static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo,
> +static int amdgpu_ttm_map_buffer(struct drm_sched_entity *entity,
> + struct ttm_buffer_object *bo,
Probably better to split this patch into multiple patches.
One which changes amdgpu_ttm_map_buffer() and then another one or two for the higher level copy_buffer and fill_buffer functions.
> struct ttm_resource *mem,
> struct amdgpu_res_cursor *mm_cur,
> unsigned int window, struct amdgpu_ring *ring,
> @@ -224,7 +226,7 @@ static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo,
> num_dw = ALIGN(adev->mman.buffer_funcs->copy_num_dw, 8);
> num_bytes = num_pages * 8 * AMDGPU_GPU_PAGES_IN_CPU_PAGE;
>
> - r = amdgpu_job_alloc_with_ib(adev, &adev->mman.default_entity.base,
> + r = amdgpu_job_alloc_with_ib(adev, entity,
> AMDGPU_FENCE_OWNER_UNDEFINED,
> num_dw * 4 + num_bytes,
> AMDGPU_IB_POOL_DELAYED, &job,
> @@ -274,6 +276,7 @@ static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo,
> /**
> * amdgpu_ttm_copy_mem_to_mem - Helper function for copy
> * @adev: amdgpu device
> + * @entity: entity to run the jobs
> * @src: buffer/address where to read from
> * @dst: buffer/address where to write to
> * @size: number of bytes to copy
> @@ -288,6 +291,7 @@ static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo,
> */
> __attribute__((nonnull))
> static int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
> + struct drm_sched_entity *entity,
> const struct amdgpu_copy_mem *src,
> const struct amdgpu_copy_mem *dst,
> uint64_t size, bool tmz,
> @@ -320,12 +324,14 @@ static int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
> cur_size = min3(src_mm.size, dst_mm.size, 256ULL << 20);
>
> /* Map src to window 0 and dst to window 1. */
> - r = amdgpu_ttm_map_buffer(src->bo, src->mem, &src_mm,
> + r = amdgpu_ttm_map_buffer(entity,
> + src->bo, src->mem, &src_mm,
> 0, ring, tmz, &cur_size, &from);
> if (r)
> goto error;
>
> - r = amdgpu_ttm_map_buffer(dst->bo, dst->mem, &dst_mm,
> + r = amdgpu_ttm_map_buffer(entity,
> + dst->bo, dst->mem, &dst_mm,
> 1, ring, tmz, &cur_size, &to);
> if (r)
> goto error;
> @@ -353,7 +359,7 @@ static int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
> write_compress_disable));
> }
>
> - r = amdgpu_copy_buffer(ring, from, to, cur_size, resv,
> + r = amdgpu_copy_buffer(ring, entity, from, to, cur_size, resv,
> &next, true, copy_flags);
> if (r)
> goto error;
> @@ -394,7 +400,9 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
> src.offset = 0;
> dst.offset = 0;
>
> - r = amdgpu_ttm_copy_mem_to_mem(adev, &src, &dst,
> + r = amdgpu_ttm_copy_mem_to_mem(adev,
> + &adev->mman.move_entity.base,
> + &src, &dst,
> new_mem->size,
> amdgpu_bo_encrypted(abo),
> bo->base.resv, &fence);
> @@ -406,8 +414,9 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
> (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) {
> struct dma_fence *wipe_fence = NULL;
>
> - r = amdgpu_fill_buffer(abo, 0, NULL, &wipe_fence,
> - false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
> + r = amdgpu_fill_buffer(&adev->mman.move_entity,
> + abo, 0, NULL, &wipe_fence,
> + AMDGPU_KERNEL_JOB_ID_MOVE_BLIT);
> if (r) {
> goto error;
> } else if (wipe_fence) {
> @@ -2223,16 +2232,15 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
> }
>
> static int amdgpu_ttm_prepare_job(struct amdgpu_device *adev,
> + struct drm_sched_entity *entity,
> unsigned int num_dw,
> struct dma_resv *resv,
> bool vm_needs_flush,
> struct amdgpu_job **job,
> - bool delayed, u64 k_job_id)
> + u64 k_job_id)
> {
> enum amdgpu_ib_pool_type pool = AMDGPU_IB_POOL_DELAYED;
> int r;
> - struct drm_sched_entity *entity = delayed ? &adev->mman.clear_entity.base :
> - &adev->mman.move_entity.base;
> r = amdgpu_job_alloc_with_ib(adev, entity,
> AMDGPU_FENCE_OWNER_UNDEFINED,
> num_dw * 4, pool, job, k_job_id);
> @@ -2252,7 +2260,9 @@ static int amdgpu_ttm_prepare_job(struct amdgpu_device *adev,
> DMA_RESV_USAGE_BOOKKEEP);
> }
>
> -int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> +int amdgpu_copy_buffer(struct amdgpu_ring *ring,
> + struct drm_sched_entity *entity,
> + uint64_t src_offset,
> uint64_t dst_offset, uint32_t byte_count,
> struct dma_resv *resv,
> struct dma_fence **fence,
> @@ -2274,8 +2284,8 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
> num_loops = DIV_ROUND_UP(byte_count, max_bytes);
> num_dw = ALIGN(num_loops * adev->mman.buffer_funcs->copy_num_dw, 8);
> - r = amdgpu_ttm_prepare_job(adev, num_dw,
> - resv, vm_needs_flush, &job, false,
> + r = amdgpu_ttm_prepare_job(adev, entity, num_dw,
> + resv, vm_needs_flush, &job,
> AMDGPU_KERNEL_JOB_ID_TTM_COPY_BUFFER);
> if (r)
> return r;
> @@ -2304,11 +2314,13 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> return r;
> }
>
> -static int amdgpu_ttm_fill_mem(struct amdgpu_ring *ring, uint32_t src_data,
> +static int amdgpu_ttm_fill_mem(struct amdgpu_ring *ring,
> + struct drm_sched_entity *entity,
> + uint32_t src_data,
> uint64_t dst_addr, uint32_t byte_count,
> struct dma_resv *resv,
> struct dma_fence **fence,
> - bool vm_needs_flush, bool delayed,
> + bool vm_needs_flush,
> u64 k_job_id)
> {
> struct amdgpu_device *adev = ring->adev;
> @@ -2321,8 +2333,8 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_ring *ring, uint32_t src_data,
> max_bytes = adev->mman.buffer_funcs->fill_max_bytes;
> num_loops = DIV_ROUND_UP_ULL(byte_count, max_bytes);
> num_dw = ALIGN(num_loops * adev->mman.buffer_funcs->fill_num_dw, 8);
> - r = amdgpu_ttm_prepare_job(adev, num_dw, resv, vm_needs_flush,
> - &job, delayed, k_job_id);
> + r = amdgpu_ttm_prepare_job(adev, entity, num_dw, resv,
> + vm_needs_flush, &job, k_job_id);
> if (r)
> return r;
>
> @@ -2386,13 +2398,14 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
> /* Never clear more than 256MiB at once to avoid timeouts */
> size = min(cursor.size, 256ULL << 20);
>
> - r = amdgpu_ttm_map_buffer(&bo->tbo, bo->tbo.resource, &cursor,
> + r = amdgpu_ttm_map_buffer(&adev->mman.clear_entity.base,
> + &bo->tbo, bo->tbo.resource, &cursor,
> 1, ring, false, &size, &addr);
> if (r)
> goto err;
>
> - r = amdgpu_ttm_fill_mem(ring, 0, addr, size, resv,
> - &next, true, true,
> + r = amdgpu_ttm_fill_mem(ring, &adev->mman.clear_entity.base, 0, addr, size, resv,
> + &next, true,
> AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER);
> if (r)
> goto err;
> @@ -2408,12 +2421,12 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
> return r;
> }
>
> -int amdgpu_fill_buffer(struct amdgpu_bo *bo,
> - uint32_t src_data,
> - struct dma_resv *resv,
> - struct dma_fence **f,
> - bool delayed,
> - u64 k_job_id)
> +int amdgpu_fill_buffer(struct amdgpu_ttm_entity *entity,
> + struct amdgpu_bo *bo,
> + uint32_t src_data,
> + struct dma_resv *resv,
> + struct dma_fence **f,
> + u64 k_job_id)
> {
> struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
> struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
> @@ -2437,13 +2450,15 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
> /* Never fill more than 256MiB at once to avoid timeouts */
> cur_size = min(dst.size, 256ULL << 20);
>
> - r = amdgpu_ttm_map_buffer(&bo->tbo, bo->tbo.resource, &dst,
> + r = amdgpu_ttm_map_buffer(&entity->base,
> + &bo->tbo, bo->tbo.resource, &dst,
> 1, ring, false, &cur_size, &to);
> if (r)
> goto error;
>
> - r = amdgpu_ttm_fill_mem(ring, src_data, to, cur_size, resv,
> - &next, true, delayed, k_job_id);
> + r = amdgpu_ttm_fill_mem(ring, &entity->base,
> + src_data, to, cur_size, resv,
> + &next, true, k_job_id);
> if (r)
> goto error;
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index d2295d6c2b67..e1655f86a016 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -167,7 +167,9 @@ int amdgpu_ttm_init(struct amdgpu_device *adev);
> void amdgpu_ttm_fini(struct amdgpu_device *adev);
> void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev,
> bool enable);
> -int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> +int amdgpu_copy_buffer(struct amdgpu_ring *ring,
> + struct drm_sched_entity *entity,
If I'm not completely mistaken you should be able to drop the ring argument since that can be determined from the entity.
Apart from that looks rather good to me.
Regards,
Christian.
> + uint64_t src_offset,
> uint64_t dst_offset, uint32_t byte_count,
> struct dma_resv *resv,
> struct dma_fence **fence,
> @@ -175,12 +177,12 @@ int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
> int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
> struct dma_resv *resv,
> struct dma_fence **fence);
> -int amdgpu_fill_buffer(struct amdgpu_bo *bo,
> - uint32_t src_data,
> - struct dma_resv *resv,
> - struct dma_fence **fence,
> - bool delayed,
> - u64 k_job_id);
> +int amdgpu_fill_buffer(struct amdgpu_ttm_entity *entity,
> + struct amdgpu_bo *bo,
> + uint32_t src_data,
> + struct dma_resv *resv,
> + struct dma_fence **f,
> + u64 k_job_id);
>
> int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
> void amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> index d74ff6e90590..09756132fa1b 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> @@ -157,7 +157,8 @@ svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys,
> goto out_unlock;
> }
>
> - r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE,
> + r = amdgpu_copy_buffer(ring, &entity->base,
> + gart_s, gart_d, size * PAGE_SIZE,
> NULL, &next, true, 0);
> if (r) {
> dev_err(adev->dev, "fail %d to copy memory\n", r);
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