From patchwork Wed Feb 28 20:14:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 10249599 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 654CC60212 for ; Wed, 28 Feb 2018 20:15:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 53D6D28789 for ; Wed, 28 Feb 2018 20:15:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 488CE28DF3; Wed, 28 Feb 2018 20:15:11 +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 vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F131E28789 for ; Wed, 28 Feb 2018 20:15:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934540AbeB1UOz (ORCPT ); Wed, 28 Feb 2018 15:14:55 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48318 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934224AbeB1UOy (ORCPT ); Wed, 28 Feb 2018 15:14:54 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7A47D49018; Wed, 28 Feb 2018 20:14:54 +0000 (UTC) Received: from gimli.home (ovpn-117-203.phx2.redhat.com [10.3.117.203]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1706C5D9C7; Wed, 28 Feb 2018 20:14:47 +0000 (UTC) Subject: [PATCH 1/3] vfio/pci: Pull BAR mapping setup from read-write path From: Alex Williamson To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, alex.williamson@redhat.com, peterx@redhat.com, eric.auger@redhat.com, aik@ozlabs.ru Date: Wed, 28 Feb 2018 13:14:46 -0700 Message-ID: <20180228201446.25283.82272.stgit@gimli.home> In-Reply-To: <20180228195504.25283.45666.stgit@gimli.home> References: <20180228195504.25283.45666.stgit@gimli.home> User-Agent: StGit/0.18-102-gdf9f MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 28 Feb 2018 20:14:54 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This creates a common helper that we'll use for ioeventfd setup. Signed-off-by: Alex Williamson Reviewed-by: Peter Xu Reviewed-by: Eric Auger --- drivers/vfio/pci/vfio_pci_rdwr.c | 39 ++++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c index 357243d76f10..5f2b376dcebd 100644 --- a/drivers/vfio/pci/vfio_pci_rdwr.c +++ b/drivers/vfio/pci/vfio_pci_rdwr.c @@ -113,6 +113,30 @@ static ssize_t do_io_rw(void __iomem *io, char __user *buf, return done; } +static int vfio_pci_setup_barmap(struct vfio_pci_device *vdev, int bar) +{ + struct pci_dev *pdev = vdev->pdev; + int ret; + void __iomem *io; + + if (vdev->barmap[bar]) + return 0; + + ret = pci_request_selected_regions(pdev, 1 << bar, "vfio"); + if (ret) + return ret; + + io = pci_iomap(pdev, bar, 0); + if (!io) { + pci_release_selected_regions(pdev, 1 << bar); + return -ENOMEM; + } + + vdev->barmap[bar] = io; + + return 0; +} + ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf, size_t count, loff_t *ppos, bool iswrite) { @@ -147,22 +171,13 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf, if (!io) return -ENOMEM; x_end = end; - } else if (!vdev->barmap[bar]) { - int ret; - - ret = pci_request_selected_regions(pdev, 1 << bar, "vfio"); + } else { + int ret = vfio_pci_setup_barmap(vdev, bar); if (ret) return ret; - io = pci_iomap(pdev, bar, 0); - if (!io) { - pci_release_selected_regions(pdev, 1 << bar); - return -ENOMEM; - } - - vdev->barmap[bar] = io; - } else io = vdev->barmap[bar]; + } if (bar == vdev->msix_bar) { x_start = vdev->msix_offset;