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 */ |
6 | struct 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 | |
16 | struct frame_vector *frame_vector_create(unsigned int nr_frames); |
17 | void frame_vector_destroy(struct frame_vector *vec); |
18 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, |
19 | bool write, struct frame_vector *vec); |
20 | void put_vaddr_frames(struct frame_vector *vec); |
21 | int frame_vector_to_pages(struct frame_vector *vec); |
22 | void frame_vector_to_pfns(struct frame_vector *vec); |
23 | |
24 | static inline unsigned int frame_vector_count(struct frame_vector *vec) |
25 | { |
26 | return vec->nr_frames; |
27 | } |
28 | |
29 | static 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(error: err); |
36 | } |
37 | return (struct page **)(vec->ptrs); |
38 | } |
39 | |
40 | static 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 */ |
48 | |