drm/amdgpu: introduce amdgpu_ttm_buffer_entity

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No functional change for now, but this struct will have more
fields added in the next commit.

This change would introduce synchronisation issue, because
dependencies between successive jobs are not taken care of
properly. For instance, amdgpu_ttm_clear_buffer uses
amdgpu_ttm_map_buffer then amdgpu_ttm_fill_mem which should
use different entities (default_entity then move/clear entity).
To prevent failures for this commit, we limit ourselves to
2 entities: default_entity (which replaces high_pr usages) and
clear_entity (which replaces low_pr usages).

The next commits will deal with these dependencies correctly,
and then we'll be able to use move_entity.

---
v2: renamed amdgpu_ttm_buffer_entity
v4: don't use move_entity in ttm yet
---

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com> (v3)
Acked-by: Felix Kuehling <felix.kuehling@amd.com> (v3)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Pierre-Eric Pelloux-Prayer 2025-09-19 09:35:03 +02:00 • committed by Alex Deucher

parent a0f8297068

commit edf47fb3d1

4 changed files with 39 additions and 18 deletions

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2

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

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30

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

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12

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h

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13

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

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