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io_uring/memmap: flag vmap'ed regions

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Add internal flags for struct io_mapped_region. The first flag we need
is IO_REGION_F_VMAPPED, that indicates that the pointer has to be
unmapped on region destruction. For now all regions are vmap'ed, so it's
set unconditionally.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/5a3d8046a038da97c0f8a8c8f1733fa3fc689d31.1732886067.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-11-29 13:34:24 +00:00 committed by Jens Axboe
parent b82a795d7d
commit 36cdb4f782
3 changed files with 14 additions and 7 deletions
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5
include/linux/io_uring_types.h
View File

@ -78,8 +78,9 @@ struct io_hash_table {
struct io_mapped_region {
struct page **pages;
void *vmap_ptr;
size_t nr_pages;
void *ptr;
unsigned nr_pages;
unsigned flags;
};
/*

14
io_uring/memmap.c
View File

@ -202,14 +202,19 @@ void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
return ERR_PTR(-ENOMEM);
}
enum {
/* memory was vmap'ed for the kernel, freeing the region vunmap's it */
IO_REGION_F_VMAP = 1,
};
void io_free_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr)
{
if (mr->pages) {
unpin_user_pages(mr->pages, mr->nr_pages);
kvfree(mr->pages);
}
if (mr->vmap_ptr)
vunmap(mr->vmap_ptr);
if ((mr->flags & IO_REGION_F_VMAP) && mr->ptr)
vunmap(mr->ptr);
if (mr->nr_pages && ctx->user)
__io_unaccount_mem(ctx->user, mr->nr_pages);
@ -225,7 +230,7 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
void *vptr;
u64 end;
if (WARN_ON_ONCE(mr->pages || mr->vmap_ptr || mr->nr_pages))
if (WARN_ON_ONCE(mr->pages || mr->ptr || mr->nr_pages))
return -EFAULT;
if (memchr_inv(&reg->__resv, 0, sizeof(reg->__resv)))
return -EINVAL;
@ -260,8 +265,9 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
}
mr->pages = pages;
mr->vmap_ptr = vptr;
mr->ptr = vptr;
mr->nr_pages = nr_pages;
mr->flags |= IO_REGION_F_VMAP;
return 0;
out_free:
if (pages_accounted)

2
io_uring/memmap.h
View File

@ -28,7 +28,7 @@ int io_create_region(struct io_ring_ctx *ctx, struct io_mapped_region *mr,
static inline void *io_region_get_ptr(struct io_mapped_region *mr)
{
return mr->vmap_ptr;
return mr->ptr;
}
static inline bool io_region_is_set(struct io_mapped_region *mr)