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9ec1ac835e
Prevent drivers from using this directly. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch> Link: https://lore.kernel.org/r/20240723121750.2086-8-christian.koenig@amd.com
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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* Copyright 2018 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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*
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*/
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#ifndef _TTM_BO_INTERNAL_H_
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#define _TTM_BO_INTERNAL_H_
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#include <drm/ttm/ttm_bo.h>
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/**
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* ttm_bo_get - reference a struct ttm_buffer_object
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*
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* @bo: The buffer object.
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*/
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static inline void ttm_bo_get(struct ttm_buffer_object *bo)
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{
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kref_get(&bo->kref);
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}
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/**
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* ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
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* its refcount has already reached zero.
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* @bo: The buffer object.
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*
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* Used to reference a TTM buffer object in lookups where the object is removed
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* from the lookup structure during the destructor and for RCU lookups.
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*
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* Returns: @bo if the referencing was successful, NULL otherwise.
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*/
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static inline __must_check struct ttm_buffer_object *
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ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
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{
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if (!kref_get_unless_zero(&bo->kref))
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return NULL;
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return bo;
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}
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#endif
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