[Qemu-devel] [PATCH v5 10/12] block/io_uring: adds userspace completion polling

From: Aarushi Mehta <mehta.aaru20@gmail.com>
To: qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>,
	Sergio Lopez <slp@redhat.com>,
	qemu-block@nongnu.org, Markus Armbruster <armbru@redhat.com>,
	Max Reitz <mreitz@redhat.com>,
	saket.sinha89@gmail.com, Stefan Hajnoczi <stefanha@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Julia Suvorova <jusual@mail.ru>,
	Aarushi Mehta <mehta.aaru20@gmail.com>
Subject: [Qemu-devel] [PATCH v5 10/12] block/io_uring: adds userspace completion polling
Date: Mon, 10 Jun 2019 19:19:03 +0530	[thread overview]
Message-ID: <20190610134905.22294-11-mehta.aaru20@gmail.com> (raw)
In-Reply-To: <20190610134905.22294-1-mehta.aaru20@gmail.com>

Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
---
 block/io_uring.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/block/io_uring.c b/block/io_uring.c
index 47e027364a..acfaa48151 100644
--- a/block/io_uring.c
+++ b/block/io_uring.c
@@ -142,6 +142,21 @@ static void qemu_luring_completion_cb(void *opaque)
     qemu_luring_process_completions_and_submit(s);
 }
 
+static bool qemu_luring_poll_cb(void *opaque)
+{
+    LuringState *s = opaque;
+    struct io_uring_cqe *cqes;
+
+    if (io_uring_peek_cqe(&s->ring, &cqes) == 0) {
+        if (!cqes) {
+            qemu_luring_process_completions_and_submit(s);
+            return true;
+        }
+    }
+
+    return false;
+}
+
 static void ioq_init(LuringQueue *io_q)
 {
     QSIMPLEQ_INIT(&io_q->sq_overflow);
@@ -294,7 +309,7 @@ void luring_attach_aio_context(LuringState *s, AioContext *new_context)
     s->aio_context = new_context;
     s->completion_bh = aio_bh_new(new_context, qemu_luring_completion_bh, s);
     aio_set_fd_handler(s->aio_context, s->ring.ring_fd, false,
-                       qemu_luring_completion_cb, NULL, NULL, s);
+                       qemu_luring_completion_cb, NULL, qemu_luring_poll_cb, s);
 }
 
 LuringState *luring_init(Error **errp)
-- 
2.17.1


