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