From patchwork Thu Nov 7 15:11:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11233119 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 B92FA1747 for ; Thu, 7 Nov 2019 15:13:23 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A06F6218AE for ; Thu, 7 Nov 2019 15:13:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A06F6218AE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B145C6F6CC; Thu, 7 Nov 2019 15:13:22 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id E04946F6CE for ; Thu, 7 Nov 2019 15:13:21 +0000 (UTC) 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-37-449BzMvmN6Sn8PaFxD90qg-1; Thu, 07 Nov 2019 10:13:15 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CDA2C107ACC3; Thu, 7 Nov 2019 15:13:11 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-21.pek2.redhat.com [10.72.12.21]) by smtp.corp.redhat.com (Postfix) with ESMTP id D0DF1600D1; Thu, 7 Nov 2019 15:12:45 +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 Subject: [PATCH V11 3/6] mdev: introduce device specific ops Date: Thu, 7 Nov 2019 23:11:06 +0800 Message-Id: <20191107151109.23261-4-jasowang@redhat.com> In-Reply-To: <20191107151109.23261-1-jasowang@redhat.com> References: <20191107151109.23261-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: 449BzMvmN6Sn8PaFxD90qg-1 X-Mimecast-Spam-Score: 0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573139600; 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=SsFfHA12rLKQuNw+Ju5OJCJI1NTIItUqVY4qTacphZY=; b=UFE+ZJ68w0zt95WK+sNsztuIgs0p/OzgVcbhyW369ueX9sHz5fsfENKAZGZJa53VFxeNJv bpk6Qp9D0PnNf9D5VMlIs87fkt2soJSgkOh8VSdbsu38oET2cKqR1JeEneJuaInE5D+bab GP8xnVBQrp8v3bVC1XWakIQZcULnp/Y= X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: rdunlap@infradead.org, christophe.de.dinechin@gmail.com, sebott@linux.ibm.com, airlied@linux.ie, Jason Wang , heiko.carstens@de.ibm.com, kevin.tian@intel.com, virtualization@lists.linux-foundation.org, rob.miller@broadcom.com, lulu@redhat.com, eperezma@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, haotian.wang@sifive.com, zhi.a.wang@intel.com, farman@linux.ibm.com, parav@mellanox.com, gor@linux.ibm.com, cunming.liang@intel.com, rodrigo.vivi@intel.com, xiao.w.wang@intel.com, freude@linux.ibm.com, stefanha@redhat.com, zhihong.wang@intel.com, akrowiak@linux.ibm.com, netdev@vger.kernel.org, cohuck@redhat.com, oberpar@linux.ibm.com, maxime.coquelin@redhat.com, lingshan.zhu@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Currently, except for the create and remove, the rest of mdev_parent_ops is designed for vfio-mdev driver only and may not help for kernel mdev driver. With the help of class id, this patch introduces device specific callbacks inside mdev_device structure. This allows different set of callback to be used by vfio-mdev and virtio-mdev. Reviewed-by: Parav Pandit Signed-off-by: Jason Wang Reviewed-by: Cornelia Huck Reviewed-by: Kirti Wankhede --- .../driver-api/vfio-mediated-device.rst | 35 +++++++++---- MAINTAINERS | 1 + drivers/gpu/drm/i915/gvt/kvmgt.c | 18 ++++--- drivers/s390/cio/vfio_ccw_ops.c | 18 ++++--- drivers/s390/crypto/vfio_ap_ops.c | 14 +++-- drivers/vfio/mdev/mdev_core.c | 24 ++++++++- drivers/vfio/mdev/mdev_private.h | 5 ++ drivers/vfio/mdev/vfio_mdev.c | 37 ++++++------- include/linux/mdev.h | 43 ++++----------- include/linux/mdev_vfio_ops.h | 52 +++++++++++++++++++ samples/vfio-mdev/mbochs.c | 20 ++++--- samples/vfio-mdev/mdpy.c | 20 ++++--- samples/vfio-mdev/mtty.c | 18 ++++--- 13 files changed, 206 insertions(+), 99 deletions(-) create mode 100644 include/linux/mdev_vfio_ops.h diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index 6709413bee29..04d56884c357 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -152,15 +152,6 @@ 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: - -* open: open callback of mediated device -* close: close callback of mediated device -* ioctl: ioctl callback of mediated device -* read : read emulation callback -* write: write emulation callback -* mmap: mmap emulation callback - A driver should use the mdev_parent_ops structure in the function call to register itself with the mdev core driver:: @@ -172,10 +163,34 @@ that a driver should use to unregister itself with the mdev core driver:: extern void mdev_unregister_device(struct device *dev); -It is also required to specify the class_id in create() callback through:: +As multiple types of mediated devices may be supported, class id needs +to be specified in the create() callback. This could be done +explicitly for the device that interacts with the mdev device directly +through:: int mdev_set_class(struct mdev_device *mdev, u16 id); +For the device that uses the mdev bus for its operation, the class +should provide helper function to set class id and device specific +ops. E.g for vfio-mdev devices, the function to be called is:: + + int mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops); + +The class id (set by this function to MDEV_CLASS_ID_VFIO) is used to +match a device with an mdev driver via its id table. The device +specific callbacks (specified in *vfio_ops) are obtainable via +mdev_get_vfio_ops() (for use by the mdev bus driver). A vfio-mdev +device (class id MDEV_CLASS_ID_VFIO) uses the following +device-specific ops: + +* 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 + Mediated Device Management Interface Through sysfs ================================================== diff --git a/MAINTAINERS b/MAINTAINERS index cba1095547fd..f661d13344d6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17121,6 +17121,7 @@ S: Maintained F: Documentation/driver-api/vfio-mediated-device.rst F: drivers/vfio/mdev/ F: include/linux/mdev.h +F: include/linux/mdev_vfio_ops.h F: samples/vfio-mdev/ VFIO PLATFORM DRIVER diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 6420f0dbd31b..662f3a672372 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -643,6 +644,8 @@ static void kvmgt_put_vfio_device(void *vgpu) vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device); } +static const struct mdev_vfio_device_ops intel_vfio_vgpu_dev_ops; + static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) { struct intel_vgpu *vgpu = NULL; @@ -678,7 +681,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) dev_name(mdev_dev(mdev))); ret = 0; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &intel_vfio_vgpu_dev_ops); out: return ret; } @@ -1599,20 +1602,21 @@ 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_device_ops intel_vfio_vgpu_dev_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 cf2c013ae32f..fa473ded71c7 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -12,6 +12,7 @@ #include #include +#include #include #include @@ -110,6 +111,8 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct vfio_ccw_private *private = @@ -129,7 +132,7 @@ static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no); - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -575,11 +578,7 @@ 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_device_ops mdev_vfio_ops = { .open = vfio_ccw_mdev_open, .release = vfio_ccw_mdev_release, .read = vfio_ccw_mdev_read, @@ -587,6 +586,13 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = { .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) { return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops); diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 07c31070afeb..7bdc62393112 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -321,6 +322,8 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, matrix->adm_max = info->apxa ? info->Nd : 15; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) { struct ap_matrix_mdev *matrix_mdev; @@ -343,7 +346,7 @@ 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_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -1281,15 +1284,18 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, return ret; } +static const struct mdev_vfio_device_ops mdev_vfio_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 7bfa2e46e829..4e70f19ac145 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -47,7 +47,8 @@ EXPORT_SYMBOL(mdev_set_drvdata); /* * Specify the class for the mdev device, this must be called during - * create() callback. + * create() callback explicitly or implicitly through the helpers + * provided by each class. */ void mdev_set_class(struct mdev_device *mdev, u16 id) { @@ -56,6 +57,27 @@ void mdev_set_class(struct mdev_device *mdev, u16 id) } EXPORT_SYMBOL(mdev_set_class); +/* + * Specify the mdev device to be a VFIO mdev device, and set VFIO + * device ops for it. This must be called from the create() callback + * for VFIO mdev device. + */ +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops) +{ + mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev->vfio_ops = vfio_ops; +} +EXPORT_SYMBOL(mdev_set_vfio_ops); + +/* Get the VFIO device ops for the mdev device. */ +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) +{ + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VFIO); + return mdev->vfio_ops; +} +EXPORT_SYMBOL(mdev_get_vfio_ops); + struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index c65f436c1869..411227373625 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -10,6 +10,8 @@ #ifndef MDEV_PRIVATE_H #define MDEV_PRIVATE_H +#include + int mdev_bus_register(void); void mdev_bus_unregister(void); @@ -34,6 +36,9 @@ struct mdev_device { struct device *iommu_device; bool active; u16 class_id; + union { + const struct mdev_vfio_device_ops *vfio_ops; + }; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index a6641cd8b5a3..c01e2194e4b3 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b/drivers/vfio/mdev/vfio_mdev.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "mdev_private.h" @@ -24,16 +25,16 @@ static int vfio_mdev_open(void *device_data) { struct mdev_device *mdev = device_data; - struct mdev_parent *parent = mdev->parent; + const struct mdev_vfio_device_ops *ops = mdev_get_vfio_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 +44,10 @@ 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_device_ops *ops = mdev_get_vfio_ops(mdev); - if (likely(parent->ops->release)) - parent->ops->release(mdev); + if (likely(ops->release)) + ops->release(mdev); module_put(THIS_MODULE); } @@ -55,47 +56,47 @@ 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_device_ops *ops = mdev_get_vfio_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_device_ops *ops = mdev_get_vfio_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_device_ops *ops = mdev_get_vfio_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_device_ops *ops = mdev_get_vfio_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 = { diff --git a/include/linux/mdev.h b/include/linux/mdev.h index 78b69d09eb54..9e37506d1987 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -10,7 +10,13 @@ #ifndef MDEV_H #define MDEV_H +#include +#include +#include +#include + struct mdev_device; +struct mdev_vfio_device_ops; /* * Called by the parent device driver to set the device which represents @@ -48,30 +54,7 @@ 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 +66,6 @@ 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 */ @@ -135,6 +109,9 @@ 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); void mdev_set_class(struct mdev_device *mdev, u16 id); +void mdev_set_vfio_ops(struct mdev_device *mdev, + const struct mdev_vfio_device_ops *vfio_ops); +const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev); extern struct bus_type mdev_bus_type; diff --git a/include/linux/mdev_vfio_ops.h b/include/linux/mdev_vfio_ops.h new file mode 100644 index 000000000000..317518f30621 --- /dev/null +++ b/include/linux/mdev_vfio_ops.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * VFIO Mediated device definition + */ + +#ifndef MDEV_VFIO_OPS_H +#define MDEV_VFIO_OPS_H + +#include + +/** + * struct mdev_vfio_device_ops - Structure to be registered for each + * mdev device to register the device to vfio-mdev module. + * + * @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_device_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); +}; + +#endif diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c index 115bc5074656..12963767ba37 100644 --- a/samples/vfio-mdev/mbochs.c +++ b/samples/vfio-mdev/mbochs.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -516,6 +517,8 @@ static int mbochs_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mbochs_type *type = mbochs_find_type(kobj); @@ -561,7 +564,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) mbochs_reset(mdev); mbochs_used_mbytes += type->mbytes; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; err_mem: @@ -1419,12 +1422,7 @@ 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_device_ops mdev_vfio_ops = { .open = mbochs_open, .release = mbochs_close, .read = mbochs_read, @@ -1433,6 +1431,14 @@ 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 665614574d50..50ee6c98b2af 100644 --- a/samples/vfio-mdev/mdpy.c +++ b/samples/vfio-mdev/mdpy.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include "mdpy-defs.h" @@ -226,6 +227,8 @@ static int mdpy_reset(struct mdev_device *mdev) return 0; } +static const struct mdev_vfio_device_ops mdev_vfio_ops; + static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) { const struct mdpy_type *type = mdpy_find_type(kobj); @@ -269,7 +272,7 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev) mdpy_reset(mdev); mdpy_count++; - mdev_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &mdev_vfio_ops); return 0; } @@ -726,12 +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_device_ops mdev_vfio_ops = { .open = mdpy_open, .release = mdpy_close, .read = mdpy_read, @@ -740,6 +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 90da12ff7fd9..be476e7ad1f8 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -708,6 +709,8 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, return ret; } +static const struct mdev_vfio_device_ops vfio_dev_ops; + static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) { struct mdev_state *mdev_state; @@ -755,7 +758,7 @@ 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_set_class(mdev, MDEV_CLASS_ID_VFIO); + mdev_set_vfio_ops(mdev, &vfio_dev_ops); return 0; } @@ -1388,6 +1391,14 @@ static struct attribute_group *mdev_type_groups[] = { NULL, }; +static const struct mdev_vfio_device_ops vfio_dev_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, @@ -1395,11 +1406,6 @@ 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)