From patchwork Thu Mar 19 14:55:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 6050161 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 76E02BF90F for ; Thu, 19 Mar 2015 14:58:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 854012051A for ; Thu, 19 Mar 2015 14:58:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 993AB20519 for ; Thu, 19 Mar 2015 14:58:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755820AbbCSO6k (ORCPT ); Thu, 19 Mar 2015 10:58:40 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:35735 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755564AbbCSO6f (ORCPT ); Thu, 19 Mar 2015 10:58:35 -0400 Received: by wibdy8 with SMTP id dy8so120195362wib.0 for ; Thu, 19 Mar 2015 07:58:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=J75PTyWKq4OE1hoDicZ+1xgB5UTTsubU+CPLJ81pT0g=; b=lcebdKLsWoJfPOh3y1ZwzjUVys4X8h3fFLkj/CjdmeoKnxz8d2h4iIcnGtlBZ+YNdS D4LhoDQ7OoIk636BRWAhdwTdGHQQ10wTjLcfZs9jVCPAeI0a6Y/O8CJsLU6VfXmeqfv8 hOuq3kdjLBBJ2hN5wmj1F5oYWBzp50sWfru82UkjMZMA4FmDDg4XYUd5I1AUiFCbY5ee UybskEntukGNa0ML2waDWiNBI8Xo8zvWaAjbppVcuSC2Vbh3IvaxCsDYu4O6YgTiQBwN 8YwTlgp5ry/CCK1KmA3Sr1fqOceVKsbpzjj8JS3uz9uOqy2WloxHC4Qfe5ahA0GnoEJm vZAw== X-Gm-Message-State: ALoCoQn7z2BB4BChi4VSwgGaAh/kEI9e0XwYrhRgLhwtDAHYv7ptsCMqVZInriYTn6ARNuVs/rFo X-Received: by 10.194.63.16 with SMTP id c16mr155535700wjs.117.1426777113852; Thu, 19 Mar 2015 07:58:33 -0700 (PDT) Received: from gnx2579.gnb.st.com (weg38-3-78-232-41-119.fbx.proxad.net. [78.232.41.119]) by mx.google.com with ESMTPSA id a6sm1695350wiy.17.2015.03.19.07.58.32 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 19 Mar 2015 07:58:33 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, alex.williamson@redhat.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, pbonzini@redhat.com, kim.phillips@freescale.com, b.reynal@virtualopensystems.com, feng.wu@intel.com Subject: [RFC v5 05/13] VFIO: external user API for interaction with vfio devices Date: Thu, 19 Mar 2015 15:55:43 +0100 Message-Id: <1426776951-24901-6-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1426776951-24901-1-git-send-email-eric.auger@linaro.org> References: <1426776951-24901-1-git-send-email-eric.auger@linaro.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The VFIO external user API is enriched with 3 new functions that allows a kernel user external to VFIO to retrieve some information from a VFIO device. - vfio_device_get_external_user enables to get a vfio device from its fd and increments its reference counter - vfio_device_put_external_user decrements the reference counter - vfio_external_base_device returns a handle to the struct device --- v3 -> v4: - change the commit title v2 -> v3: - reword the commit message v1 -> v2: - vfio_external_get_base_device renamed into vfio_external_base_device - vfio_external_get_type removed Signed-off-by: Eric Auger --- drivers/vfio/vfio.c | 24 ++++++++++++++++++++++++ include/linux/vfio.h | 3 +++ 2 files changed, 27 insertions(+) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 23ba12a..33ae8c5 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1490,6 +1490,30 @@ void vfio_group_put_external_user(struct vfio_group *group) } EXPORT_SYMBOL_GPL(vfio_group_put_external_user); +struct vfio_device *vfio_device_get_external_user(struct file *filep) +{ + struct vfio_device *vdev = filep->private_data; + + if (filep->f_op != &vfio_device_fops) + return ERR_PTR(-EINVAL); + + vfio_device_get(vdev); + return vdev; +} +EXPORT_SYMBOL_GPL(vfio_device_get_external_user); + +void vfio_device_put_external_user(struct vfio_device *vdev) +{ + vfio_device_put(vdev); +} +EXPORT_SYMBOL_GPL(vfio_device_put_external_user); + +struct device *vfio_external_base_device(struct vfio_device *vdev) +{ + return vdev->dev; +} +EXPORT_SYMBOL_GPL(vfio_external_base_device); + int vfio_external_user_iommu_id(struct vfio_group *group) { return iommu_group_id(group->iommu_group); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 683b514..b18c38f 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -101,6 +101,9 @@ extern void vfio_group_put_external_user(struct vfio_group *group); extern int vfio_external_user_iommu_id(struct vfio_group *group); extern long vfio_external_check_extension(struct vfio_group *group, unsigned long arg); +extern struct vfio_device *vfio_device_get_external_user(struct file *filep); +extern void vfio_device_put_external_user(struct vfio_device *vdev); +extern struct device *vfio_external_base_device(struct vfio_device *vdev); struct pci_dev; #ifdef CONFIG_EEH