From patchwork Sun Feb 3 14:10:13 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Pandarathil, Vijaymohan R" X-Patchwork-Id: 2086371 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id D17D93FD56 for ; Sun, 3 Feb 2013 14:17:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753194Ab3BCORC (ORCPT ); Sun, 3 Feb 2013 09:17:02 -0500 Received: from g9t1613g.houston.hp.com ([15.240.0.71]:30416 "EHLO g9t1613g.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753102Ab3BCORA convert rfc822-to-8bit (ORCPT ); Sun, 3 Feb 2013 09:17:00 -0500 X-Greylist: delayed 345 seconds by postgrey-1.27 at vger.kernel.org; Sun, 03 Feb 2013 09:17:00 EST Received: from g4t3425.houston.hp.com (g4t3425.houston.hp.com [15.201.208.53]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by g9t1613g.houston.hp.com (Postfix) with ESMTPS id 2BE9360081; Sun, 3 Feb 2013 14:11:15 +0000 (UTC) Received: from G4W6310.americas.hpqcorp.net (g4w6310.houston.hp.com [16.210.26.217]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by g4t3425.houston.hp.com (Postfix) with ESMTPS id ECE5F75; Sun, 3 Feb 2013 14:10:43 +0000 (UTC) Received: from G9W3613.americas.hpqcorp.net (16.216.186.48) by G4W6310.americas.hpqcorp.net (16.210.26.217) with Microsoft SMTP Server (TLS) id 14.2.328.9; Sun, 3 Feb 2013 14:10:15 +0000 Received: from G9W0717.americas.hpqcorp.net ([169.254.4.192]) by G9W3613.americas.hpqcorp.net ([16.216.186.48]) with mapi id 14.02.0328.009; Sun, 3 Feb 2013 14:10:15 +0000 From: "Pandarathil, Vijaymohan R" To: Alex Williamson , Gleb Natapov , Bjorn Helgaas , Blue Swirl , "Ortiz, Lance E" CC: "kvm@vger.kernel.org" , "qemu-devel@nongnu.org" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH v3 1/3] VFIO: Wrapper for getting reference to vfio_device from device Thread-Topic: [PATCH v3 1/3] VFIO: Wrapper for getting reference to vfio_device from device Thread-Index: AQHOAhgvGm4m2YTF7Ui9c4qTcz1oDg== Date: Sun, 3 Feb 2013 14:10:13 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [15.201.58.27] MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org - Added vfio_device_get_from_dev() as wrapper to get reference to vfio_device from struct device. - Added vfio_device_data() as a wrapper to get device_data from vfio_device. Signed-off-by: Vijay Mohan Pandarathil --- drivers/vfio/vfio.c | 41 ++++++++++++++++++++++++++++++++--------- include/linux/vfio.h | 3 +++ 2 files changed, 35 insertions(+), 9 deletions(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 12c264d..f0a78a2 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -407,12 +407,13 @@ static void vfio_device_release(struct kref *kref) } /* Device reference always implies a group reference */ -static void vfio_device_put(struct vfio_device *device) +void vfio_device_put(struct vfio_device *device) { struct vfio_group *group = device->group; kref_put_mutex(&device->kref, vfio_device_release, &group->device_lock); vfio_group_put(group); } +EXPORT_SYMBOL_GPL(vfio_device_put); static void vfio_device_get(struct vfio_device *device) { @@ -642,8 +643,12 @@ int vfio_add_group_dev(struct device *dev, } EXPORT_SYMBOL_GPL(vfio_add_group_dev); -/* Test whether a struct device is present in our tracking */ -static bool vfio_dev_present(struct device *dev) +/** + * This does a get on the vfio_device from device. + * Callers of this function will have to call vfio_put_device() to + * remove the reference. + */ +struct vfio_device *vfio_device_get_from_dev(struct device *dev) { struct iommu_group *iommu_group; struct vfio_group *group; @@ -651,25 +656,43 @@ static bool vfio_dev_present(struct device *dev) iommu_group = iommu_group_get(dev); if (!iommu_group) - return false; + return NULL; group = vfio_group_get_from_iommu(iommu_group); if (!group) { iommu_group_put(iommu_group); - return false; + return NULL; } device = vfio_group_get_device(group, dev); if (!device) { vfio_group_put(group); iommu_group_put(iommu_group); - return false; + return NULL; } - - vfio_device_put(device); vfio_group_put(group); iommu_group_put(iommu_group); - return true; + return device; +} +EXPORT_SYMBOL_GPL(vfio_device_get_from_dev); + +void *vfio_device_data(struct vfio_device *device) +{ + return device->device_data; +} +EXPORT_SYMBOL_GPL(vfio_device_data); + +/* Test whether a struct device is present in our tracking */ +static bool vfio_dev_present(struct device *dev) +{ + struct vfio_device *device; + + device = vfio_device_get_from_dev(dev); + if (device) { + vfio_device_put(device); + return true; + } else + return false; } /* diff --git a/include/linux/vfio.h b/include/linux/vfio.h index ab9e862..ac8d488 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -45,6 +45,9 @@ extern int vfio_add_group_dev(struct device *dev, void *device_data); extern void *vfio_del_group_dev(struct device *dev); +extern struct vfio_device *vfio_device_get_from_dev(struct device *dev); +extern void vfio_device_put(struct vfio_device *device); +extern void *vfio_device_data(struct vfio_device *device); /** * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks