From patchwork Wed Apr 25 11:24:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 904144 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40WJ131yFrz9s0t for ; Wed, 25 Apr 2018 21:31:03 +1000 (AEST) Received: from localhost ([::1]:35851 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fBIdY-0005EJ-BU for incoming@patchwork.ozlabs.org; Wed, 25 Apr 2018 07:31:00 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33190) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fBIXT-0000HJ-87 for qemu-devel@nongnu.org; Wed, 25 Apr 2018 07:24:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fBIXR-0001Ab-2Z for qemu-devel@nongnu.org; Wed, 25 Apr 2018 07:24:43 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:46092 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 1fBIXQ-0001AF-Uc for qemu-devel@nongnu.org; Wed, 25 Apr 2018 07:24:41 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 849ED406C757; Wed, 25 Apr 2018 11:24:40 +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 AC3FE2023239; Wed, 25 Apr 2018 11:24:34 +0000 (UTC) From: Pankaj Gupta To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, linux-nvdimm@ml01.01.org, linux-mm@kvack.org Date: Wed, 25 Apr 2018 16:54:14 +0530 Message-Id: <20180425112415.12327-3-pagupta@redhat.com> In-Reply-To: <20180425112415.12327-1-pagupta@redhat.com> References: <20180425112415.12327-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Wed, 25 Apr 2018 11:24:40 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Wed, 25 Apr 2018 11:24:40 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.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 v2 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, lcapitulino@redhat.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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch adds functionality to perform flush from guest to hosy over VIRTIO when 'ND_REGION_VIRTIO'flag is set on nd_negion. Flag is set by 'virtio-pmem' driver. 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 a612be6..6c6454e 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 @@ -1074,6 +1075,12 @@ 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.