From patchwork Thu Apr 5 10:48:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 10324395 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1C65E600CB for ; Thu, 5 Apr 2018 10:50:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0963F2896F for ; Thu, 5 Apr 2018 10:50:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F24EE2914D; Thu, 5 Apr 2018 10:50:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AA67E2896F for ; Thu, 5 Apr 2018 10:50:51 +0000 (UTC) Received: from localhost ([::1]:48292 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f42Ti-00031h-SW for patchwork-qemu-devel@patchwork.kernel.org; Thu, 05 Apr 2018 06:50:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58231) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f42SM-0001yY-Em for qemu-devel@nongnu.org; Thu, 05 Apr 2018 06:49:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f42SJ-0003jz-Sg for qemu-devel@nongnu.org; Thu, 05 Apr 2018 06:49:26 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:60854 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f42SJ-0003jg-Nv for qemu-devel@nongnu.org; Thu, 05 Apr 2018 06:49:23 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 21D758160F98; Thu, 5 Apr 2018 10:49:23 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (dhcp193-127.pnq.redhat.com [10.65.193.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9CAB163537; Thu, 5 Apr 2018 10:49:07 +0000 (UTC) From: Pankaj Gupta To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, linux-nvdimm@ml01.01.org Date: Thu, 5 Apr 2018 16:18:33 +0530 Message-Id: <20180405104834.10457-3-pagupta@redhat.com> In-Reply-To: <20180405104834.10457-1-pagupta@redhat.com> References: <20180405104834.10457-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 05 Apr 2018 10:49:23 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 05 Apr 2018 10:49:23 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'pagupta@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [RFC 2/2] pmem: device flush over VIRTIO X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, haozhong.zhang@intel.com, jack@suse.cz, xiaoguangrong.eric@gmail.com, riel@surriel.com, pagupta@redhat.com, niteshnarayanlal@hotmail.com, david@redhat.com, ross.zwisler@intel.com, hch@infradead.org, mst@redhat.com, stefanha@redhat.com, imammedo@redhat.com, marcel@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, nilal@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch adds functionality to perform flush from guest to host over VIRTIO when 'ND_REGION_VIRTIO' flag is set on nd_negion. This flag is set by 'virtio-pmem' driver for virtio flush operation. Signed-off-by: Pankaj Gupta --- drivers/nvdimm/region_devs.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index abaf38c..1c6cd2a 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -20,6 +20,7 @@ #include #include "nd-core.h" #include "nd.h" +#include /* * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is @@ -1043,6 +1044,12 @@ void nvdimm_flush(struct nd_region *nd_region) struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev); int i, idx; + /* call PV device flush */ + if (test_bit(ND_REGION_VIRTIO, &nd_region->flags)) { + virtio_pmem_flush(&nd_region->dev); + return; + } + /* * Try to encourage some diversity in flush hint addresses * across cpus assuming a limited number of flush hints.