From patchwork Mon Nov 18 06:16:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11248923 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2DF88138C for ; Mon, 18 Nov 2019 06:19:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D43B620730 for ; Mon, 18 Nov 2019 06:19:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Ss0HODaW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726714AbfKRGTQ (ORCPT ); Mon, 18 Nov 2019 01:19:16 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:31629 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726423AbfKRGTP (ORCPT ); Mon, 18 Nov 2019 01:19:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574057953; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ILPwU2XW7Uon1IHgNepH0sAbcBRiNrLLEANtDOku+/s=; b=Ss0HODaWN8tUoNWBv8iwEUwTgLIC/j4xPVIvomQYiTEY4lK1yH5DvvlrBGhN+JxXLr5BFX lSzwD82FFm/8/8HMYSOx3ciSvKbXdtEqTHToySkawmaVqeTAIqauP8Vp32PndYCbySwSAa v2rV3PW6GSztQ0CGBXXbx9FeUeMBWDQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-346-sSwyrq7aMHO-zgLPA0uVtA-1; Mon, 18 Nov 2019 01:19:09 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 476D0800594; Mon, 18 Nov 2019 06:19:05 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-215.pek2.redhat.com [10.72.12.215]) by smtp.corp.redhat.com (Postfix) with ESMTP id 90F5860BF4; Mon, 18 Nov 2019 06:18:38 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, cohuck@redhat.com, maxime.coquelin@redhat.com, cunming.liang@intel.com, zhihong.wang@intel.com, rob.miller@broadcom.com, xiao.w.wang@intel.com, haotian.wang@sifive.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch, farman@linux.ibm.com, pasic@linux.ibm.com, sebott@linux.ibm.com, oberpar@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akrowiak@linux.ibm.com, freude@linux.ibm.com, lingshan.zhu@intel.com, eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com, christophe.de.dinechin@gmail.com, kevin.tian@intel.com, stefanha@redhat.com, rdunlap@infradead.org, hch@infradead.org, gregkh@linuxfoundation.org, jgg@mellanox.com, Jason Wang Subject: [PATCH V12 2/6] mdev: split out VFIO bus specific parent ops Date: Mon, 18 Nov 2019 14:16:59 +0800 Message-Id: <20191118061703.8669-3-jasowang@redhat.com> In-Reply-To: <20191118061703.8669-1-jasowang@redhat.com> References: <20191118061703.8669-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: sSwyrq7aMHO-zgLPA0uVtA-1 X-Mimecast-Spam-Score: 0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The only thing left for generalizing mdev is the VFIO specific parent ops. This is basically the open/release/read/write/ioctl/mmap. To support this, mdev core is extend to support a specific size of structure during create, this will allow to compose mdev structure into mdev vfio structure and place the VFIO specific callbacks there like: struct mdev_vfio { struct mdev_device mdev; const struct mdev_vfio_ops *ops; }; Helpers for setting and getting the ops were introduced to support mdev vfio device to set ops and vfio mdev driver to use the ops. Signed-off-by: Jason Wang --- .../driver-api/vfio-mediated-device.rst | 34 +++++++++------ drivers/gpu/drm/i915/gvt/kvmgt.c | 16 ++++--- drivers/s390/cio/vfio_ccw_ops.c | 17 +++++--- drivers/s390/crypto/vfio_ap_ops.c | 13 ++++-- drivers/vfio/mdev/mdev_core.c | 5 ++- drivers/vfio/mdev/mdev_private.h | 5 +++ drivers/vfio/mdev/mdev_vfio.c | 30 ++++++++++++- drivers/vfio/mdev/vfio_mdev.c | 38 ++++++++-------- include/linux/mdev.h | 37 ---------------- include/linux/mdev_vfio.h | 43 +++++++++++++++++++ samples/vfio-mdev/mbochs.c | 18 +++++--- samples/vfio-mdev/mdpy.c | 19 +++++--- samples/vfio-mdev/mtty.c | 16 ++++--- 13 files changed, 189 insertions(+), 102 deletions(-) diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index 1887d27a565e..9045584e4ea3 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -153,26 +153,36 @@ callbacks per mdev parent device, per mdev type, or any other categorization. Vendor drivers are expected to be fully asynchronous in this respect or provide their own internal resource protection.) -The callbacks in the mdev_parent_ops structure are as follows: +A driver should use the mdev_parent_ops structure in the function call +to register itself with the mdev core driver:: -* open: open callback of mediated device -* close: close callback of mediated device -* ioctl: ioctl callback of mediated device + extern int mdev_vfio_register_device(struct device *dev, + const struct mdev_parent_ops *ops); + +However, the mdev_parent_ops structure is not required in the function call +that a driver should use to unregister itself with the mdev core driver:: + + extern void mdev_vfio_unregister_device(struct device *dev); + +The VFIO specific callbacks is abstracted in mdev_vfio_ops structure +are as follows: + +* open: open callback of VFIO mediated device +* close: close callback of VFIO mediated device +* ioctl: ioctl callback of VFIO mediated device * read : read emulation callback * write: write emulation callback * mmap: mmap emulation callback -A driver should use the mdev_parent_ops structure and bus type in the -function call to register itself with the mdev core driver:: +During the creation of VFIO mediated device, mdev_vfio_ops need to be +specified:: - extern int mdev_register_device(struct device *dev, - const struct mdev_parent_ops *ops, - struct bus_type *bus); + void mdev_vfio_set_ops(struct mdev_device *mdev, + const struct mdev_vfio_ops *ops); -However, the mdev_parent_ops structure is not required in the function call -that a driver should use to unregister itself with the mdev core driver:: +Those callbacks could be fetched by drivers through:: - extern void mdev_unregister_device(struct device *dev); + const struct mdev_vfio_ops *mdev_vfio_get_ops(struct mdev_device *mdev); Mediated Device Management Interface Through sysfs diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 8c02572c9b42..fbd1f1676c15 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -643,6 +643,8 @@ static void kvmgt_put_vfio_device(void *vgpu) vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device); } +static const struct mdev_vfio_ops intel_mdev_vfio_ops; + static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) { struct intel_vgpu *vgpu = NULL; @@ -678,6 +680,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) dev_name(mdev_dev(mdev))); ret = 0; + mdev_vfio_set_ops(mdev, &intel_mdev_vfio_ops); out: return ret; } @@ -1598,20 +1601,21 @@ static const struct attribute_group *intel_vgpu_groups[] = { NULL, }; -static struct mdev_parent_ops intel_vgpu_ops = { - .mdev_attr_groups = intel_vgpu_groups, - .create = intel_vgpu_create, - .remove = intel_vgpu_remove, - +static const struct mdev_vfio_ops intel_mdev_vfio_ops = { .open = intel_vgpu_open, .release = intel_vgpu_release, - .read = intel_vgpu_read, .write = intel_vgpu_write, .mmap = intel_vgpu_mmap, .ioctl = intel_vgpu_ioctl, }; +static struct mdev_parent_ops intel_vgpu_ops = { + .mdev_attr_groups = intel_vgpu_groups, + .create = intel_vgpu_create, + .remove = intel_vgpu_remove, +}; + static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops) { struct attribute **kvm_type_attrs; diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index 791b8b0eb027..811f0a3b1903 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -110,6 +110,8 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_ops vfio_ccw_mdev_vfio_ops; + static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct vfio_ccw_private *private = @@ -129,6 +131,8 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no); + mdev_vfio_set_ops(mdev, &vfio_ccw_mdev_vfio_ops); + return 0; } @@ -574,16 +578,19 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, } } -static const struct mdev_parent_ops vfio_ccw_mdev_ops = { - .owner = THIS_MODULE, - .supported_type_groups = mdev_type_groups, - .create = vfio_ccw_mdev_create, - .remove = vfio_ccw_mdev_remove, +static const struct mdev_vfio_ops vfio_ccw_mdev_vfio_ops = { .open = vfio_ccw_mdev_open, .release = vfio_ccw_mdev_release, .read = vfio_ccw_mdev_read, .write = vfio_ccw_mdev_write, .ioctl = vfio_ccw_mdev_ioctl, +} + +static const struct mdev_parent_ops vfio_ccw_mdev_ops = { + .owner = THIS_MODULE, + .supported_type_groups = mdev_type_groups, + .create = vfio_ccw_mdev_create, + .remove = vfio_ccw_mdev_remove, }; int vfio_ccw_mdev_reg(struct subchannel *sch) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 78048e670374..0649c68287d7 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -321,6 +321,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, matrix->adm_max = info->apxa ? info->Nd : 15; } +static const struct mdev_vfio_ops vfio_ap_matrix_mdev_ops; + static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev; @@ -343,6 +345,8 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&matrix_mdev->node, &matrix_dev->mdev_list); mutex_unlock(&matrix_dev->lock); + mdev_vfio_set_ops(mdev, &vfio_ap_matrix_mdev_ops); + return 0; } @@ -1280,15 +1284,18 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, return ret; } +static const struct mdev_vfio_ops vfio_ap_matrix_mdev_ops = { + .open = vfio_ap_mdev_open, + .release = vfio_ap_mdev_release, + .ioctl = vfio_ap_mdev_ioctl, +} + static const struct mdev_parent_ops vfio_ap_matrix_ops = { .owner = THIS_MODULE, .supported_type_groups = vfio_ap_mdev_type_groups, .mdev_attr_groups = vfio_ap_mdev_attr_groups, .create = vfio_ap_mdev_create, .remove = vfio_ap_mdev_remove, - .open = vfio_ap_mdev_open, - .release = vfio_ap_mdev_release, - .ioctl = vfio_ap_mdev_ioctl, }; int vfio_ap_mdev_register(void) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index e1272a40c521..c6bc67bf63fa 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -179,7 +179,7 @@ static struct class_compat *mdev_alloc_class_compat(struct bus_type *bus) * Returns a negative value on error, otherwise 0. */ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops, - struct bus_type *bus) + struct bus_type *bus, size_t dev_size) { int ret; struct mdev_parent *parent; @@ -217,6 +217,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops, parent->dev = dev; parent->ops = ops; parent->bus = bus; + parent->dev_size = dev_size; mutex_lock(&compat_list_lock); class_compat = mdev_alloc_class_compat(bus); @@ -339,7 +340,7 @@ int mdev_device_create(struct kobject *kobj, } } - mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); + mdev = kzalloc(parent->dev_size, GFP_KERNEL); if (!mdev) { mutex_unlock(&mdev_list_lock); ret = -ENOMEM; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index 298d7a0f493a..012ab80719e9 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -20,6 +20,7 @@ struct mdev_parent { struct list_head type_list; /* Synchronize device creation/removal with parent unregistration */ struct rw_semaphore unreg_sem; + size_t dev_size; }; struct mdev_device { @@ -66,4 +67,8 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, const guid_t *uuid); int mdev_device_remove(struct device *dev); +int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops, + struct bus_type *bus, size_t dev_size); +void mdev_unregister_device(struct device *dev); + #endif /* MDEV_PRIVATE_H */ diff --git a/drivers/vfio/mdev/mdev_vfio.c b/drivers/vfio/mdev/mdev_vfio.c index f9d1191b9982..44e116074f88 100644 --- a/drivers/vfio/mdev/mdev_vfio.c +++ b/drivers/vfio/mdev/mdev_vfio.c @@ -4,6 +4,8 @@ #include #include +#include "mdev_private.h" + #define DRIVER_VERSION "0.1" #define DRIVER_AUTHOR "Jason Wang" #define DRIVER_DESC "Mediated VFIO bus" @@ -15,6 +17,31 @@ struct bus_type mdev_vfio_bus_type = { }; EXPORT_SYMBOL(mdev_vfio_bus_type); +#define to_vfio_mdev_device(mdev) container_of(mdev, \ + struct mdev_vfio_device, mdev) + +struct mdev_vfio_device { + struct mdev_device mdev; + const struct mdev_vfio_ops *ops; +}; + +void mdev_vfio_set_ops(struct mdev_device *mdev, + const struct mdev_vfio_ops *ops) +{ + struct mdev_vfio_device *mdev_vfio = to_vfio_mdev_device(mdev); + + mdev_vfio->ops = ops; +} +EXPORT_SYMBOL(mdev_vfio_set_ops); + +const struct mdev_vfio_ops *mdev_vfio_get_ops(struct mdev_device *mdev) +{ + struct mdev_vfio_device *mdev_vfio = to_vfio_mdev_device(mdev); + + return mdev_vfio->ops; +} +EXPORT_SYMBOL(mdev_vfio_get_ops); + static int __init mdev_init(void) { return mdev_register_bus(&mdev_vfio_bus_type); @@ -28,7 +55,8 @@ static void __exit mdev_exit(void) int mdev_vfio_register_device(struct device *dev, const struct mdev_parent_ops *ops) { - return mdev_register_device(dev, ops, &mdev_vfio_bus_type); + return mdev_register_device(dev, ops, &mdev_vfio_bus_type, + sizeof(struct mdev_vfio_device)); } EXPORT_SYMBOL(mdev_vfio_register_device); diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index 16e9ebe30d4a..8b42a4b3f161 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -24,16 +24,16 @@ static int vfio_mdev_open(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); int ret; - if (unlikely(!parent->ops->open)) + if (unlikely(!ops->open)) return -EINVAL; if (!try_module_get(THIS_MODULE)) return -ENODEV; - ret = parent->ops->open(mdev); + ret = ops->open(mdev); if (ret) module_put(THIS_MODULE); @@ -43,10 +43,10 @@ static int vfio_mdev_open(void *device_data) static void vfio_mdev_release(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); - if (likely(parent->ops->release)) - parent->ops->release(mdev); + if (likely(ops->release)) + ops->release(mdev); module_put(THIS_MODULE); } @@ -55,47 +55,47 @@ static long vfio_mdev_unlocked_ioctl(void *device_data, unsigned int cmd, unsigned long arg) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); - if (unlikely(!parent->ops->ioctl)) + if (unlikely(!ops->ioctl)) return -EINVAL; - return parent->ops->ioctl(mdev, cmd, arg); + return ops->ioctl(mdev, cmd, arg); } static ssize_t vfio_mdev_read(void *device_data, char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); - if (unlikely(!parent->ops->read)) + if (unlikely(!ops->read)) return -EINVAL; - return parent->ops->read(mdev, buf, count, ppos); + return ops->read(mdev, buf, count, ppos); } static ssize_t vfio_mdev_write(void *device_data, const char __user *buf, size_t count, loff_t *ppos) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); - if (unlikely(!parent->ops->write)) + if (unlikely(!ops->write)) return -EINVAL; - return parent->ops->write(mdev, buf, count, ppos); + return ops->write(mdev, buf, count, ppos); } static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_ops *ops = mdev_vfio_get_ops(mdev); - if (unlikely(!parent->ops->mmap)) + if (unlikely(!ops->mmap)) return -EINVAL; - return parent->ops->mmap(mdev, vma); + return ops->mmap(mdev, vma); } static const struct vfio_device_ops vfio_mdev_dev_ops = { @@ -110,7 +110,7 @@ static const struct vfio_device_ops vfio_mdev_dev_ops = { static int vfio_mdev_probe(struct device *dev) { - struct mdev_device *mdev = to_mdev_device(dev); + struct mdev_device *mdev = mdev_from_dev(dev, &mdev_vfio_bus_type); return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev); } diff --git a/include/linux/mdev.h b/include/linux/mdev.h index ee2410246b3c..25554e55bcee 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -48,30 +48,6 @@ struct device *mdev_get_iommu_device(struct device *dev); * @mdev: mdev_device device structure which is being * destroyed * Returns integer: success (0) or error (< 0) - * @open: Open mediated device. - * @mdev: mediated device. - * Returns integer: success (0) or error (< 0) - * @release: release mediated device - * @mdev: mediated device. - * @read: Read emulation callback - * @mdev: mediated device structure - * @buf: read buffer - * @count: number of bytes to read - * @ppos: address. - * Retuns number on bytes read on success or error. - * @write: Write emulation callback - * @mdev: mediated device structure - * @buf: write buffer - * @count: number of bytes to be written - * @ppos: address. - * Retuns number on bytes written on success or error. - * @ioctl: IOCTL callback - * @mdev: mediated device structure - * @cmd: ioctl command - * @arg: arguments to ioctl - * @mmap: mmap callback - * @mdev: mediated device structure - * @vma: vma structure * Parent device that support mediated device should be registered with mdev * module with mdev_parent_ops structure. **/ @@ -83,15 +59,6 @@ struct mdev_parent_ops { int (*create)(struct kobject *kobj, struct mdev_device *mdev); int (*remove)(struct mdev_device *mdev); - int (*open)(struct mdev_device *mdev); - void (*release)(struct mdev_device *mdev); - ssize_t (*read)(struct mdev_device *mdev, char __user *buf, - size_t count, loff_t *ppos); - ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, - size_t count, loff_t *ppos); - long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, - unsigned long arg); - int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); }; /* interface for exporting mdev supported type attributes */ @@ -133,10 +100,6 @@ void *mdev_get_drvdata(struct mdev_device *mdev); void mdev_set_drvdata(struct mdev_device *mdev, void *data); const guid_t *mdev_uuid(struct mdev_device *mdev); -int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops, - struct bus_type *bus); -void mdev_unregister_device(struct device *dev); - int mdev_register_driver(struct mdev_driver *drv, struct module *owner, struct bus_type *bus); void mdev_unregister_driver(struct mdev_driver *drv); diff --git a/include/linux/mdev_vfio.h b/include/linux/mdev_vfio.h index 446a7537e3fb..243ad85019a6 100644 --- a/include/linux/mdev_vfio.h +++ b/include/linux/mdev_vfio.h @@ -13,6 +13,45 @@ extern struct bus_type mdev_vfio_bus_type; +/* VFIO mdev ops + * + * @open: Open mediated device. + * @mdev: mediated device. + * Returns integer: success (0) or error (< 0) + * @release: release mediated device + * @mdev: mediated device. + * @read: Read emulation callback + * @mdev: mediated device structure + * @buf: read buffer + * @count: number of bytes to read + * @ppos: address. + * Retuns number on bytes read on success or error. + * @write: Write emulation callback + * @mdev: mediated device structure + * @buf: write buffer + * @count: number of bytes to be written + * @ppos: address. + * Retuns number on bytes written on success or error. + * @ioctl: IOCTL callback + * @mdev: mediated device structure + * @cmd: ioctl command + * @arg: arguments to ioctl + * @mmap: mmap callback + * @mdev: mediated device structure + * @vma: vma structure + */ +struct mdev_vfio_ops { + int (*open)(struct mdev_device *mdev); + void (*release)(struct mdev_device *mdev); + ssize_t (*read)(struct mdev_device *mdev, char __user *buf, + size_t count, loff_t *ppos); + ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, + size_t count, loff_t *ppos); + long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, + unsigned long arg); + int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); +}; + int mdev_vfio_register_device(struct device *dev, const struct mdev_parent_ops *ops); void mdev_vfio_unregister_device(struct device *dev); @@ -22,4 +61,8 @@ static inline struct mdev_device *vfio_mdev_from_dev(struct device *dev) return mdev_from_dev(dev, &mdev_vfio_bus_type); } +void mdev_vfio_set_ops(struct mdev_device *mdev, + const struct mdev_vfio_ops *ops); +const struct mdev_vfio_ops *mdev_vfio_get_ops(struct mdev_device *mdev); + #endif diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index f041d58324b1..b2ba32b5fed2 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -516,6 +516,8 @@ static int mbochs_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_ops mdev_ops; + static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mbochs_type *type = mbochs_find_type(kobj); @@ -561,6 +563,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) mbochs_reset(mdev); mbochs_used_mbytes += type->mbytes; + mdev_vfio_set_ops(mdev, &mdev_ops); return 0; err_mem: @@ -1418,12 +1421,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mbochs_create, - .remove = mbochs_remove, +static const struct mdev_vfio_ops mdev_ops = { .open = mbochs_open, .release = mbochs_close, .read = mbochs_read, @@ -1432,6 +1430,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mbochs_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mbochs_create, + .remove = mbochs_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c index 9c32fe3795ad..d26fd94b4783 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -226,6 +226,8 @@ static int mdpy_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_ops mdev_ops; + static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mdpy_type *type = mdpy_find_type(kobj); @@ -269,6 +271,8 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) mdpy_reset(mdev); mdpy_count++; + + mdev_vfio_set_ops(mdev, &mdev_ops); return 0; } @@ -725,12 +729,7 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; -static const struct mdev_parent_ops mdev_fops = { - .owner = THIS_MODULE, - .mdev_attr_groups = mdev_dev_groups, - .supported_type_groups = mdev_type_groups, - .create = mdpy_create, - .remove = mdpy_remove, +static const struct mdev_vfio_ops mdev_ops = { .open = mdpy_open, .release = mdpy_close, .read = mdpy_read, @@ -739,6 +738,14 @@ static const struct mdev_parent_ops mdev_fops = { .mmap = mdpy_mmap, }; +static const struct mdev_parent_ops mdev_fops = { + .owner = THIS_MODULE, + .mdev_attr_groups = mdev_dev_groups, + .supported_type_groups = mdev_type_groups, + .create = mdpy_create, + .remove = mdpy_remove, +}; + static const struct file_operations vd_fops = { .owner = THIS_MODULE, }; diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 6e4e6339e0f1..3f0c6506199a 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -708,6 +708,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, return ret; } +static const struct mdev_vfio_ops mdev_ops; + static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) { struct mdev_state *mdev_state; @@ -755,6 +757,7 @@ static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) list_add(&mdev_state->next, &mdev_devices_list); mutex_unlock(&mdev_list_lock); + mdev_vfio_set_ops(mdev, &mdev_ops); return 0; } @@ -1387,6 +1390,14 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_ops mdev_ops = { + .open = mtty_open, + .release = mtty_close, + .read = mtty_read, + .write = mtty_write, + .ioctl = mtty_ioctl, +}; + static const struct mdev_parent_ops mdev_fops = { .owner = THIS_MODULE, .dev_attr_groups = mtty_dev_groups, @@ -1394,11 +1405,6 @@ static const struct mdev_parent_ops mdev_fops = { .supported_type_groups = mdev_type_groups, .create = mtty_create, .remove = mtty_remove, - .open = mtty_open, - .release = mtty_close, - .read = mtty_read, - .write = mtty_write, - .ioctl = mtty_ioctl, }; static void mtty_device_release(struct device *dev)