| Daniel Vetter | eb83b8e | 2020-11-27 17:41:20 +0100 | [diff] [blame] | 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 | 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(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 */ |