linux/io_uring
Jens Axboe c56e022c0a io_uring: add support for user mapped provided buffer ring
The ring mapped provided buffer rings rely on the application allocating
the memory for the ring, and then the kernel will map it. This generally
works fine, but runs into issues on some architectures where we need
to be able to ensure that the kernel and application virtual address for
the ring play nicely together. This at least impacts architectures that
set SHM_COLOUR, but potentially also anyone setting SHMLBA.

To use this variant of ring provided buffers, the application need not
allocate any memory for the ring. Instead the kernel will do so, and
the allocation must subsequently call mmap(2) on the ring with the
offset set to:

	IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT)

to get a virtual address for the buffer ring. Normally the application
would allocate a suitable piece of memory (and correctly aligned) and
simply pass that in via io_uring_buf_reg.ring_addr and the kernel would
map it.

Outside of the setup differences, the kernel allocate + user mapped
provided buffer ring works exactly the same.

Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-04-03 07:14:21 -06:00
..
advise.c io_uring: always go async for unsupported fadvise flags 2023-01-29 15:18:26 -07:00
advise.h
alloc_cache.h io_uring: fix poll/netmsg alloc caches 2023-03-30 06:53:42 -06:00
cancel.c io_uring/cancel: re-grab ctx mutex after finishing wait 2022-12-21 13:31:40 -07:00
cancel.h
epoll.c io_uring: make io_kiocb_to_cmd() typesafe 2022-08-12 17:01:00 -06:00
epoll.h
fdinfo.c capability: just use a 'u64' instead of a 'u32[2]' array 2023-03-01 10:01:22 -08:00
fdinfo.h
filetable.c io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get() 2023-03-22 11:04:55 -06:00
filetable.h io_uring: kill hot path fixed file bitmap debug checks 2022-10-16 17:07:53 -06:00
fs.c io_uring: for requests that require async, force it 2023-01-29 15:18:26 -07:00
fs.h
io_uring.c io_uring: add support for user mapped provided buffer ring 2023-04-03 07:14:21 -06:00
io_uring.h io_uring: mark task TASK_RUNNING before handling resume/task work 2023-02-06 08:23:21 -07:00
io-wq.c io_uring/io-wq: stop setting PF_NO_SETAFFINITY on io-wq workers 2023-03-08 08:48:13 -07:00
io-wq.h
kbuf.c io_uring: add support for user mapped provided buffer ring 2023-04-03 07:14:21 -06:00
kbuf.h io_uring: add support for user mapped provided buffer ring 2023-04-03 07:14:21 -06:00
Makefile
msg_ring.c io_uring/msg_ring: let target know allocated index 2023-03-16 07:16:56 -06:00
msg_ring.h io_uring: get rid of double locking 2022-12-07 06:47:13 -07:00
net.c io_uring/net: avoid sending -ECONNABORTED on repeated connection requests 2023-03-20 20:44:45 -06:00
net.h io_uring/net: zerocopy sendmsg 2022-09-21 13:15:02 -06:00
nop.c
nop.h
notif.c io_uring: refactor req allocation 2023-01-29 15:17:41 -07:00
notif.h io_uring: move zc reporting from the hot path 2022-11-21 07:38:31 -07:00
opdef.c io_uring,audit: don't log IORING_OP_MADVISE 2023-02-10 16:00:30 -07:00
opdef.h io_uring: Split io_issue_def struct 2023-01-29 15:17:41 -07:00
openclose.c io_uring: always go async for unsupported open flags 2023-01-29 15:18:26 -07:00
openclose.h
poll.c io_uring/poll: clear single/double poll flags on poll arming 2023-03-28 07:09:01 -06:00
poll.h io_uring/poll: allow some retries for poll triggering spuriously 2023-02-25 20:10:13 -07:00
refs.h
rsrc.c io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get() 2023-03-22 11:04:55 -06:00
rsrc.h io_uring/rsrc: fix rogue rsrc node grabbing 2023-03-29 09:23:46 -06:00
rw.c for-6.3/iter-ubuf-2023-02-16 2023-02-20 14:03:57 -08:00
rw.h io_uring/rw: don't lose partial IO result on fail 2022-09-21 13:15:02 -06:00
slist.h io_uring: silence variable ‘prev’ set but not used warning 2023-03-09 10:10:58 -07:00
splice.c io_uring: for requests that require async, force it 2023-01-29 15:18:26 -07:00
splice.h
sqpoll.c io_uring/sqpoll: Do not set PF_NO_SETAFFINITY on sqpoll threads 2023-03-15 06:50:59 -06:00
sqpoll.h io_uring: make io_sqpoll_wait_sq return void 2023-01-29 15:17:40 -07:00
statx.c io_uring: for requests that require async, force it 2023-01-29 15:18:26 -07:00
statx.h
sync.c io_uring: for requests that require async, force it 2023-01-29 15:18:26 -07:00
sync.h
tctx.c io_uring: rename 'in_idle' to 'in_cancel' 2023-02-22 09:57:23 -07:00
tctx.h io_uring: simplify __io_uring_add_tctx_node 2022-10-07 12:25:30 -06:00
timeout.c io_uring: ease timeout flush locking requirements 2022-12-14 08:53:35 -07:00
timeout.h io_uring: remove unused return from io_disarm_next 2022-09-21 13:15:01 -06:00
uring_cmd.c block-6.3-2023-03-24 2023-03-24 14:10:39 -07:00
uring_cmd.h
xattr.c io_uring: for requests that require async, force it 2023-01-29 15:18:26 -07:00
xattr.h