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io_uring: add iopoll infrastructure for io_uring_cmd

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Put this up in the same way as iopoll is done for regular read/write IO.
Make place for storing a cookie into struct io_uring_cmd on submission.
Perform the completion using the ->uring_cmd_iopoll handler.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20220823161443.49436-3-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kanchan Joshi 2022-08-23 21:44:41 +05:30 committed by Jens Axboe
parent de27e18e86
commit 5756a3a7e7
5 changed files with 29 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
include/linux/io_uring.h
View file

@ -20,8 +20,12 @@ enum io_uring_cmd_flags {
struct io_uring_cmd {
struct file *file;
const void *cmd;
/* callback to defer completions to task context */
void (*task_work_cb)(struct io_uring_cmd *cmd);
union {
/* callback to defer completions to task context */
void (*task_work_cb)(struct io_uring_cmd *cmd);
/* used for polled completion */
void *cookie;
};
u32 cmd_op;
u32 pad;
u8 pdu[32]; /* available inline for free use */

6
io_uring/io_uring.c
View file

@ -1433,6 +1433,12 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
wq_list_empty(&ctx->iopoll_list))
break;
}
if (task_work_pending(current)) {
mutex_unlock(&ctx->uring_lock);
io_run_task_work();
mutex_lock(&ctx->uring_lock);
}
ret = io_do_iopoll(ctx, !min);
if (ret < 0)
break;

1
io_uring/opdef.c
View file

@ -465,6 +465,7 @@ const struct io_op_def io_op_defs[] = {
.needs_file = 1,
.plug = 1,
.name = "URING_CMD",
.iopoll = 1,
.async_size = uring_cmd_pdu_size(1),
.prep = io_uring_cmd_prep,
.issue = io_uring_cmd,

8
io_uring/rw.c
View file

@ -1011,7 +1011,13 @@ int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
if (READ_ONCE(req->iopoll_completed))
break;
ret = rw->kiocb.ki_filp->f_op->iopoll(&rw->kiocb, &iob, poll_flags);
if (req->opcode == IORING_OP_URING_CMD) {
struct io_uring_cmd *ioucmd = (struct io_uring_cmd *)rw;
ret = req->file->f_op->uring_cmd_iopoll(ioucmd);
} else
ret = rw->kiocb.ki_filp->f_op->iopoll(&rw->kiocb, &iob,
poll_flags);
if (unlikely(ret < 0))
return ret;
else if (ret)

11
io_uring/uring_cmd.c
View file

@ -50,7 +50,11 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
io_req_set_res(req, ret, 0);
if (req->ctx->flags & IORING_SETUP_CQE32)
io_req_set_cqe32_extra(req, res2, 0);
__io_req_complete(req, 0);
if (req->ctx->flags & IORING_SETUP_IOPOLL)
/* order with io_iopoll_req_issued() checking ->iopoll_complete */
smp_store_release(&req->iopoll_completed, 1);
else
__io_req_complete(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
@ -97,8 +101,11 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
issue_flags |= IO_URING_F_SQE128;
if (ctx->flags & IORING_SETUP_CQE32)
issue_flags |= IO_URING_F_CQE32;
if (ctx->flags & IORING_SETUP_IOPOLL)
if (ctx->flags & IORING_SETUP_IOPOLL) {
issue_flags |= IO_URING_F_IOPOLL;
req->iopoll_completed = 0;
WRITE_ONCE(ioucmd->cookie, NULL);
}
if (req_has_async_data(req))
ioucmd->cmd = req->async_data;