https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 7e364e56293bb98cae1b55fd835f5991c4e96e7d authored by Linus Torvalds on 02 April 2023, 21:29:29 UTC
Linux 6.3-rc5
Linux 6.3-rc5
Tip revision: 7e364e5
frame_vector.h
// SPDX-License-Identifier: GPL-2.0
#ifndef _MEDIA_FRAME_VECTOR_H
#define _MEDIA_FRAME_VECTOR_H
/* Container for pinned pfns / pages in frame_vector.c */
struct frame_vector {
unsigned int nr_allocated; /* Number of frames we have space for */
unsigned int nr_frames; /* Number of frames stored in ptrs array */
bool got_ref; /* Did we pin pages by getting page ref? */
bool is_pfns; /* Does array contain pages or pfns? */
void *ptrs[]; /* Array of pinned pfns / pages. Use
* pfns_vector_pages() or pfns_vector_pfns()
* for access */
};
struct frame_vector *frame_vector_create(unsigned int nr_frames);
void frame_vector_destroy(struct frame_vector *vec);
int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
bool write, struct frame_vector *vec);
void put_vaddr_frames(struct frame_vector *vec);
int frame_vector_to_pages(struct frame_vector *vec);
void frame_vector_to_pfns(struct frame_vector *vec);
static inline unsigned int frame_vector_count(struct frame_vector *vec)
{
return vec->nr_frames;
}
static inline struct page **frame_vector_pages(struct frame_vector *vec)
{
if (vec->is_pfns) {
int err = frame_vector_to_pages(vec);
if (err)
return ERR_PTR(err);
}
return (struct page **)(vec->ptrs);
}
static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
{
if (!vec->is_pfns)
frame_vector_to_pfns(vec);
return (unsigned long *)(vec->ptrs);
}
#endif /* _MEDIA_FRAME_VECTOR_H */