Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751427AbdFBTdH (ORCPT ); Fri, 2 Jun 2017 15:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:55996 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751316AbdFBTcC (ORCPT ); Fri, 2 Jun 2017 15:32:02 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3900823A32 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 v3 15/18] xen/pvcalls: implement the ioworker functions Date: Fri, 2 Jun 2017 12:31:52 -0700 Message-Id: <1496431915-20774-15-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1496431915-20774-1-git-send-email-sstabellini@kernel.org> References: <1496431915-20774-1-git-send-email-sstabellini@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1808 Lines: 60 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 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 6afe7a0..0283d49 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -99,8 +99,35 @@ static int pvcalls_back_release_active(struct xenbus_device *dev, struct pvcalls_fedata *priv, struct sock_mapping *map); +static void pvcalls_conn_back_read(unsigned long 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((unsigned long)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