linux-kernel - [PATCH v3 06/28] drm/amdgpu: add amdgpu_ttm_job

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Message-ID: <20251121101315.3585-7-pierre-eric.pelloux-prayer@amd.com>
Date: Fri, 21 Nov 2025 11:12:16 +0100
From: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Sumit Semwal
	<sumit.semwal@...aro.org>
CC: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
	<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: [PATCH v3 06/28] drm/amdgpu: add amdgpu_ttm_job_submit helper

Deduplicate the IB padding code and will also be used
later to check locking.

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 34 ++++++++++++-------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 17e1892c44a2..be1232b2d55e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -162,6 +162,18 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 	*placement = abo->placement;
 }
 
+static struct dma_fence *
+amdgpu_ttm_job_submit(struct amdgpu_device *adev, struct amdgpu_job *job, u32 num_dw)
+{
+	struct amdgpu_ring *ring;
+
+	ring = adev->mman.buffer_funcs_ring;
+	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
+	WARN_ON(job->ibs[0].length_dw > num_dw);
+
+	return amdgpu_job_submit(job);
+}
+
 /**
  * amdgpu_ttm_map_buffer - Map memory into the GART windows
  * @adev: the device being used
@@ -185,7 +197,6 @@ static int amdgpu_ttm_map_buffer(struct amdgpu_device *adev,
 {
 	unsigned int offset, num_pages, num_dw, num_bytes;
 	uint64_t src_addr, dst_addr;
-	struct amdgpu_ring *ring;
 	struct amdgpu_job *job;
 	void *cpu_addr;
 	uint64_t flags;
@@ -240,10 +251,6 @@ static int amdgpu_ttm_map_buffer(struct amdgpu_device *adev,
 	amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr,
 				dst_addr, num_bytes, 0);
 
-	ring = adev->mman.buffer_funcs_ring;
-	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
-	WARN_ON(job->ibs[0].length_dw > num_dw);
-
 	flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, mem);
 	if (tmz)
 		flags |= AMDGPU_PTE_TMZ;
@@ -261,7 +268,7 @@ static int amdgpu_ttm_map_buffer(struct amdgpu_device *adev,
 		amdgpu_gart_map_vram_range(adev, pa, 0, num_pages, flags, cpu_addr);
 	}
 
-	dma_fence_put(amdgpu_job_submit(job));
+	dma_fence_put(amdgpu_ttm_job_submit(adev, job, num_dw));
 	return 0;
 }
 
@@ -1497,10 +1504,7 @@ static int amdgpu_ttm_access_memory_sdma(struct ttm_buffer_object *bo,
 	amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr, dst_addr,
 				PAGE_SIZE, 0);
 
-	amdgpu_ring_pad_ib(adev->mman.buffer_funcs_ring, &job->ibs[0]);
-	WARN_ON(job->ibs[0].length_dw > num_dw);
-
-	fence = amdgpu_job_submit(job);
+	fence = amdgpu_ttm_job_submit(adev, job, num_dw);
 
 	if (!dma_fence_wait_timeout(fence, false, adev->sdma_timeout))
 		r = -ETIMEDOUT;
@@ -2285,11 +2289,9 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev, uint64_t src_offset,
 		byte_count -= cur_size_in_bytes;
 	}
 
-	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
-	WARN_ON(job->ibs[0].length_dw > num_dw);
-	*fence = amdgpu_job_submit(job);
 	if (r)
 		goto error_free;
+	*fence = amdgpu_ttm_job_submit(adev, job, num_dw);
 
 	return r;
 
@@ -2307,7 +2309,6 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev, uint32_t src_data,
 			       u64 k_job_id)
 {
 	unsigned int num_loops, num_dw;
-	struct amdgpu_ring *ring;
 	struct amdgpu_job *job;
 	uint32_t max_bytes;
 	unsigned int i;
@@ -2331,10 +2332,7 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev, uint32_t src_data,
 		byte_count -= cur_size;
 	}
 
-	ring = adev->mman.buffer_funcs_ring;
-	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
-	WARN_ON(job->ibs[0].length_dw > num_dw);
-	*fence = amdgpu_job_submit(job);
+	*fence = amdgpu_ttm_job_submit(adev, job, num_dw);
 	return 0;
 }
 
-- 
2.43.0