drm/amdgpu: Allow PASID allocator to store fpriv owner

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AMDGPU already has a global PASID xarray used for PASID allocation.

Allow amdgpu_pasid_alloc() to optionally store the owning DRM
file-private object directly.

Initial callers pass NULL. A later patch in this series passes the DRM
file-private object for DRM PASIDs.

This prepares for using:

	PASID -> fpriv -> VM

instead of:

	PASID -> VM

Clear the stored owner from amdgpu_pasid_free_delayed() before waiting
for outstanding fences so PASID lookups cannot observe a stale fpriv
while the PASID itself is pending delayed release.

v6:
- Correct the PASID allocator kernel-doc to refer to the XArray cyclic
  allocator.
- Document that PASID owner lookup may return NULL and that the returned
  fpriv remains valid only while the PASID lock is held.
- No code changes. Retain Christian's Reviewed-by tag.

v5:
- Store NULL instead of xa_mk_value(0) for ownerless PASIDs.
- Simplify owner clearing by unconditionally storing NULL.

v4:
- Add fpriv as an optional parameter to amdgpu_pasid_alloc().
- Drop separate amdgpu_pasid_set_fpriv()/clear_fpriv() helpers.
- Clear PASID owner from amdgpu_pasid_free_delayed().

Cc: Alex Deucher <alexander.deucher@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Srinivasan Shanmugam 2026-07-19 19:22:55 +05:30 • committed by Alex Deucher

parent ac9c371515

commit 636df65409

3 changed files with 82 additions and 11 deletions

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85

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

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6

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

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2

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

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