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- // SPDX-License-Identifier: GPL-2.0
- #ifndef _MEDIA_FRAME_VECTOR_H
- #define _MEDIA_FRAME_VECTOR_H
- /* Container for pinned pfns / pages in frame_vector.c */
- struct frame_vector {
- unsigned int nr_allocated; /* Number of frames we have space for */
- unsigned int nr_frames; /* Number of frames stored in ptrs array */
- bool got_ref; /* Did we pin pages by getting page ref? */
- bool is_pfns; /* Does array contain pages or pfns? */
- void *ptrs[]; /* Array of pinned pfns / pages. Use
- * pfns_vector_pages() or pfns_vector_pfns()
- * for access */
- };
- struct frame_vector *frame_vector_create(unsigned int nr_frames);
- void frame_vector_destroy(struct frame_vector *vec);
- int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
- struct frame_vector *vec);
- void put_vaddr_frames(struct frame_vector *vec);
- int frame_vector_to_pages(struct frame_vector *vec);
- void frame_vector_to_pfns(struct frame_vector *vec);
- static inline unsigned int frame_vector_count(struct frame_vector *vec)
- {
- return vec->nr_frames;
- }
- static inline struct page **frame_vector_pages(struct frame_vector *vec)
- {
- if (vec->is_pfns) {
- int err = frame_vector_to_pages(vec);
- if (err)
- return ERR_PTR(err);
- }
- return (struct page **)(vec->ptrs);
- }
- static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
- {
- if (!vec->is_pfns)
- frame_vector_to_pfns(vec);
- return (unsigned long *)(vec->ptrs);
- }
- #endif /* _MEDIA_FRAME_VECTOR_H */
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