From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754563AbdGCVLL (ORCPT ); Mon, 3 Jul 2017 17:11:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:52144 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753736AbdGCVIr (ORCPT ); Mon, 3 Jul 2017 17:08:47 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AE53222C8D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=sstabellini@kernel.org From: Stefano Stabellini To: xen-devel@lists.xen.org Cc: linux-kernel@vger.kernel.org, sstabellini@kernel.org, jgross@suse.com, boris.ostrovsky@oracle.com, Stefano Stabellini Subject: [PATCH v6 15/18] xen/pvcalls: implement the ioworker functions Date: Mon, 3 Jul 2017 14:08:36 -0700 Message-Id: <1499116119-15638-15-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1499116119-15638-1-git-send-email-sstabellini@kernel.org> References: <1499116119-15638-1-git-send-email-sstabellini@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We have one ioworker per socket. Each ioworker goes through the list of outstanding read/write requests. Once all requests have been dealt with, it returns. We use one atomic counter per socket for "read" operations and one for "write" operations to keep track of the reads/writes to do. We also use one atomic counter ("io") per ioworker to keep track of how many outstanding requests we have in total assigned to the ioworker. The ioworker finishes when there are none. Signed-off-by: Stefano Stabellini Reviewed-by: Boris Ostrovsky CC: boris.ostrovsky@oracle.com CC: jgross@suse.com --- drivers/xen/pvcalls-back.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index 71a42fc..d59c2e4 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -96,8 +96,35 @@ static int pvcalls_back_release_active(struct xenbus_device *dev, struct pvcalls_fedata *fedata, struct sock_mapping *map); +static void pvcalls_conn_back_read(void *opaque) +{ +} + +static int pvcalls_conn_back_write(struct sock_mapping *map) +{ + return 0; +} + static void pvcalls_back_ioworker(struct work_struct *work) { + struct pvcalls_ioworker *ioworker = container_of(work, + struct pvcalls_ioworker, register_work); + struct sock_mapping *map = container_of(ioworker, struct sock_mapping, + ioworker); + + while (atomic_read(&map->io) > 0) { + if (atomic_read(&map->release) > 0) { + atomic_set(&map->release, 0); + return; + } + + if (atomic_read(&map->read) > 0) + pvcalls_conn_back_read(map); + if (atomic_read(&map->write) > 0) + pvcalls_conn_back_write(map); + + atomic_dec(&map->io); + } } static int pvcalls_back_socket(struct xenbus_device *dev, -- 1.9.1