Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932672AbbDMMmD (ORCPT ); Mon, 13 Apr 2015 08:42:03 -0400 Received: from mail-wg0-f46.google.com ([74.125.82.46]:33865 "EHLO mail-wg0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754439AbbDMMcl (ORCPT ); Mon, 13 Apr 2015 08:32:41 -0400 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, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, alex.williamson@redhat.com, pbonzini@redhat.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, feng.wu@intel.com, b.reynal@virtualopensystems.com Subject: [RFC v6 05/16] VFIO: external user API for interaction with vfio devices Date: Mon, 13 Apr 2015 14:29:20 +0200 Message-Id: <1428928171-18884-6-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1428928171-18884-1-git-send-email-eric.auger@linaro.org> References: <1428928171-18884-1-git-send-email-eric.auger@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2642 Lines: 85 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/