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47 lines
1.4 KiB
47 lines
1.4 KiB
// 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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