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1// SPDX-License-Identifier: GPL-2.0
2#ifndef _MEDIA_FRAME_VECTOR_H
3#define _MEDIA_FRAME_VECTOR_H
4
5/* Container for pinned pfns / pages in frame_vector.c */
6struct frame_vector {
7 unsigned int nr_allocated; /* Number of frames we have space for */
8 unsigned int nr_frames; /* Number of frames stored in ptrs array */
9 bool got_ref; /* Did we pin pages by getting page ref? */
10 bool is_pfns; /* Does array contain pages or pfns? */
11 void *ptrs[]; /* Array of pinned pfns / pages. Use
12 * pfns_vector_pages() or pfns_vector_pfns()
13 * for access */
14};
15
16struct frame_vector *frame_vector_create(unsigned int nr_frames);
17void frame_vector_destroy(struct frame_vector *vec);
18int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
19 bool write, struct frame_vector *vec);
20void put_vaddr_frames(struct frame_vector *vec);
21int frame_vector_to_pages(struct frame_vector *vec);
22void frame_vector_to_pfns(struct frame_vector *vec);
23
24static inline unsigned int frame_vector_count(struct frame_vector *vec)
25{
26 return vec->nr_frames;
27}
28
29static inline struct page **frame_vector_pages(struct frame_vector *vec)
30{
31 if (vec->is_pfns) {
32 int err = frame_vector_to_pages(vec);
33
34 if (err)
35 return ERR_PTR(err);
36 }
37 return (struct page **)(vec->ptrs);
38}
39
40static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
41{
42 if (!vec->is_pfns)
43 frame_vector_to_pfns(vec);
44 return (unsigned long *)(vec->ptrs);
45}
46
47#endif /* _MEDIA_FRAME_VECTOR_H */