Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef IO_URING_MEMMAP_H
3#define IO_URING_MEMMAP_H
4
5#define IORING_MAP_OFF_PARAM_REGION 0x20000000ULL
6#define IORING_MAP_OFF_ZCRX_REGION 0x30000000ULL
7
8#define IORING_OFF_ZCRX_SHIFT 16
9
10struct page **io_pin_pages(unsigned long uaddr, unsigned long len, int *npages);
11
12#ifndef CONFIG_MMU
13unsigned int io_uring_nommu_mmap_capabilities(struct file *file);
14#endif
15unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
16 unsigned long len, unsigned long pgoff,
17 unsigned long flags);
18int io_uring_mmap(struct file *file, struct vm_area_struct *vma);
19
20void io_free_region(struct user_struct *user, struct io_mapped_region *mr);
21int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
22 struct io_uring_region_desc *reg,
23 unsigned long mmap_offset);
24
25static inline void *io_region_get_ptr(struct io_mapped_region *mr)
26{
27 return mr->ptr;
28}
29
30static inline bool io_region_is_set(struct io_mapped_region *mr)
31{
32 return !!mr->nr_pages;
33}
34
35static inline void io_region_publish(struct io_ring_ctx *ctx,
36 struct io_mapped_region *src_region,
37 struct io_mapped_region *dst_region)
38{
39 /*
40 * Once published mmap can find it without holding only the ->mmap_lock
41 * and not ->uring_lock.
42 */
43 guard(mutex)(&ctx->mmap_lock);
44 *dst_region = *src_region;
45}
46
47static inline size_t io_region_size(struct io_mapped_region *mr)
48{
49 return (size_t) mr->nr_pages << PAGE_SHIFT;
50}
51
52#endif