mirror of https://github.com/torvalds/linux.git
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#ifndef IO_URING_MEMMAP_H
|
|
#define IO_URING_MEMMAP_H
|
|
|
|
#define IORING_MAP_OFF_PARAM_REGION 0x20000000ULL
|
|
#define IORING_MAP_OFF_ZCRX_REGION 0x30000000ULL
|
|
|
|
#define IORING_OFF_ZCRX_SHIFT 16
|
|
|
|
struct page **io_pin_pages(unsigned long uaddr, unsigned long len, int *npages);
|
|
|
|
#ifndef CONFIG_MMU
|
|
unsigned int io_uring_nommu_mmap_capabilities(struct file *file);
|
|
#endif
|
|
unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff,
|
|
unsigned long flags);
|
|
int io_uring_mmap(struct file *file, struct vm_area_struct *vma);
|
|
|
|
void io_free_region(struct user_struct *user, struct io_mapped_region *mr);
|
|
int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
|
|
struct io_uring_region_desc *reg,
|
|
unsigned long mmap_offset);
|
|
|
|
static inline void *io_region_get_ptr(struct io_mapped_region *mr)
|
|
{
|
|
return mr->ptr;
|
|
}
|
|
|
|
static inline bool io_region_is_set(struct io_mapped_region *mr)
|
|
{
|
|
return !!mr->nr_pages;
|
|
}
|
|
|
|
static inline void io_region_publish(struct io_ring_ctx *ctx,
|
|
struct io_mapped_region *src_region,
|
|
struct io_mapped_region *dst_region)
|
|
{
|
|
/*
|
|
* Once published mmap can find it without holding only the ->mmap_lock
|
|
* and not ->uring_lock.
|
|
*/
|
|
guard(mutex)(&ctx->mmap_lock);
|
|
*dst_region = *src_region;
|
|
}
|
|
|
|
static inline size_t io_region_size(struct io_mapped_region *mr)
|
|
{
|
|
return (size_t) mr->nr_pages << PAGE_SHIFT;
|
|
}
|
|
|
|
#endif
|