diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c index 04f02e0c8bb3..d6f903a2d573 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c @@ -227,6 +227,19 @@ out_free_range: return r; } +/** + * amdgpu_hmm_range_valid - check if an HMM range is still valid + * @range: pointer to the &struct amdgpu_hmm_range to validate + * + * Determines whether the given HMM range @range is still valid by + * checking for invalidations via the MMU notifier sequence. This is + * typically used to verify that the range has not been invalidated + * by concurrent address space updates before it is accessed. + * + * Return: + * * true if @range is valid and can be used safely + * * false if @range is NULL or has been invalidated + */ bool amdgpu_hmm_range_valid(struct amdgpu_hmm_range *range) { if (!range) @@ -236,6 +249,17 @@ bool amdgpu_hmm_range_valid(struct amdgpu_hmm_range *range) range->hmm_range.notifier_seq); } +/** + * amdgpu_hmm_range_alloc - allocate and initialize an AMDGPU HMM range + * @bo: optional buffer object to associate with this HMM range + * + * Allocates memory for amdgpu_hmm_range and associates it with the @bo passed. + * The reference count of the @bo is incremented. + * + * Return: + * Pointer to a newly allocated struct amdgpu_hmm_range on success, + * or NULL if memory allocation fails. + */ struct amdgpu_hmm_range *amdgpu_hmm_range_alloc(struct amdgpu_bo *bo) { struct amdgpu_hmm_range *range; @@ -248,6 +272,15 @@ struct amdgpu_hmm_range *amdgpu_hmm_range_alloc(struct amdgpu_bo *bo) return range; } +/** + * amdgpu_hmm_range_free - release an AMDGPU HMM range + * @range: pointer to the range object to free + * + * Releases all resources held by @range, including the associated + * hmm_pfns and the dropping reference of associated bo if any. + * + * Return: void + */ void amdgpu_hmm_range_free(struct amdgpu_hmm_range *range) { if (!range) |