From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A8DEC5DF60 for ; Thu, 7 Nov 2019 19:43:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F6F12075C for ; Thu, 7 Nov 2019 19:43:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="To4w6dEk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727338AbfKGTnP (ORCPT ); Thu, 7 Nov 2019 14:43:15 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:2558 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725385AbfKGTnO (ORCPT ); Thu, 7 Nov 2019 14:43:14 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 07 Nov 2019 11:42:15 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 07 Nov 2019 11:43:11 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 07 Nov 2019 11:43:11 -0800 Received: from [10.25.75.102] (172.20.13.39) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 7 Nov 2019 19:42:46 +0000 Subject: Re: [PATCH V11 4/6] mdev: introduce virtio device and its device ops To: Jason Wang , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <20191107151109.23261-1-jasowang@redhat.com> <20191107151109.23261-5-jasowang@redhat.com> X-Nvconfidentiality: public From: Kirti Wankhede Message-ID: <301e5741-6745-5884-61e7-ba82fcc49f55@nvidia.com> Date: Fri, 8 Nov 2019 01:12:42 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2 MIME-Version: 1.0 In-Reply-To: <20191107151109.23261-5-jasowang@redhat.com> X-Originating-IP: [172.20.13.39] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573155735; bh=DmkpPaqW07geXEtNLCi0eY3fMLBaOMVl4Y8y3i+qm0s=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=To4w6dEkS+YPzafmkTrf+L0+Y+SbOseJHVQN3aT/Qkkpzo51qpseGGMzj/u5Joux8 bbtHqezk+UUuMwRLoCQ17jypPhnpjL2QmFKMen8Fcq4H0nyqxUnEKVVUXEVMQAtQ6/ daKhhS+G5Z7e1hkk23nZlq9HrCCYFkjy6deFgw4CMhT7gYKaC4X+tX+DxdGJh9p2MD MKkKYsdsGrR6xEhJRKUC/8C7IF/gxIg0RO78glHOQ4ahSgHowP3PO2f5UsdBn8t6jD yyVPJH96JQNubLDSIFtJTnerQGzXXDhblM1iuWhwK+Gfy+iCx3msqhd+VVH8vbDpAO ByqptBufScNsQ== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/7/2019 8:41 PM, Jason Wang wrote: > This patch implements basic support for mdev driver that supports > virtio transport for kernel virtio driver. > > Reviewed-by: Cornelia Huck > Signed-off-by: Jason Wang I'm not expert on virtio part, my ack is from mdev perspective. Reviewed-by: Kirti Wankhede Thanks, Kirti > --- > MAINTAINERS | 1 + > drivers/vfio/mdev/mdev_core.c | 21 +++++ > drivers/vfio/mdev/mdev_private.h | 2 + > include/linux/mdev.h | 6 ++ > include/linux/mdev_virtio_ops.h | 147 +++++++++++++++++++++++++++++++ > 5 files changed, 177 insertions(+) > create mode 100644 include/linux/mdev_virtio_ops.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index f661d13344d6..4997957443df 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -17248,6 +17248,7 @@ F: include/linux/virtio*.h > F: include/uapi/linux/virtio_*.h > F: drivers/crypto/virtio/ > F: mm/balloon_compaction.c > +F: include/linux/mdev_virtio_ops.h > > VIRTIO BLOCK AND SCSI DRIVERS > M: "Michael S. Tsirkin" > diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c > index 4e70f19ac145..c58253404ed5 100644 > --- a/drivers/vfio/mdev/mdev_core.c > +++ b/drivers/vfio/mdev/mdev_core.c > @@ -78,6 +78,27 @@ const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev) > } > EXPORT_SYMBOL(mdev_get_vfio_ops); > > +/* > + * Specify the virtio device ops for the mdev device, this > + * must be called during create() callback for virtio mdev device. > + */ > +void mdev_set_virtio_ops(struct mdev_device *mdev, > + const struct mdev_virtio_device_ops *virtio_ops) > +{ > + mdev_set_class(mdev, MDEV_CLASS_ID_VIRTIO); > + mdev->virtio_ops = virtio_ops; > +} > +EXPORT_SYMBOL(mdev_set_virtio_ops); > + > +/* Get the virtio device ops for the mdev device. */ > +const struct mdev_virtio_device_ops * > +mdev_get_virtio_ops(struct mdev_device *mdev) > +{ > + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VIRTIO); > + return mdev->virtio_ops; > +} > +EXPORT_SYMBOL(mdev_get_virtio_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 411227373625..2c74dd032409 100644 > --- a/drivers/vfio/mdev/mdev_private.h > +++ b/drivers/vfio/mdev/mdev_private.h > @@ -11,6 +11,7 @@ > #define MDEV_PRIVATE_H > > #include > +#include > > int mdev_bus_register(void); > void mdev_bus_unregister(void); > @@ -38,6 +39,7 @@ struct mdev_device { > u16 class_id; > union { > const struct mdev_vfio_device_ops *vfio_ops; > + const struct mdev_virtio_device_ops *virtio_ops; > }; > }; > > diff --git a/include/linux/mdev.h b/include/linux/mdev.h > index 9e37506d1987..f3d75a60c2b5 100644 > --- a/include/linux/mdev.h > +++ b/include/linux/mdev.h > @@ -17,6 +17,7 @@ > > struct mdev_device; > struct mdev_vfio_device_ops; > +struct mdev_virtio_device_ops; > > /* > * Called by the parent device driver to set the device which represents > @@ -112,6 +113,10 @@ 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); > +void mdev_set_virtio_ops(struct mdev_device *mdev, > + const struct mdev_virtio_device_ops *virtio_ops); > +const struct mdev_virtio_device_ops * > +mdev_get_virtio_ops(struct mdev_device *mdev); > > extern struct bus_type mdev_bus_type; > > @@ -127,6 +132,7 @@ struct mdev_device *mdev_from_dev(struct device *dev); > > enum { > MDEV_CLASS_ID_VFIO = 1, > + MDEV_CLASS_ID_VIRTIO = 2, > /* New entries must be added here */ > }; > > diff --git a/include/linux/mdev_virtio_ops.h b/include/linux/mdev_virtio_ops.h > new file mode 100644 > index 000000000000..8951331c6629 > --- /dev/null > +++ b/include/linux/mdev_virtio_ops.h > @@ -0,0 +1,147 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Virtio mediated device driver > + * > + * Copyright 2019, Red Hat Corp. > + * Author: Jason Wang > + */ > +#ifndef MDEV_VIRTIO_OPS_H > +#define MDEV_VIRTIO_OPS_H > + > +#include > +#include > +#include > + > +#define VIRTIO_MDEV_DEVICE_API_STRING "virtio-mdev" > + > +struct virtio_mdev_callback { > + irqreturn_t (*callback)(void *data); > + void *private; > +}; > + > +/** > + * struct mdev_virtio_device_ops - Structure to be registered for each > + * mdev device to register the device for virtio/vhost drivers. > + * > + * The callbacks are mandatory unless explicitly mentioned. > + * > + * @set_vq_address: Set the address of virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @desc_area: address of desc area > + * @driver_area: address of driver area > + * @device_area: address of device area > + * Returns integer: success (0) or error (< 0) > + * @set_vq_num: Set the size of virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @num: the size of virtqueue > + * @kick_vq: Kick the virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @set_vq_cb: Set the interrupt callback function for > + * a virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @cb: virtio-mdev interrupt callback structure > + * @set_vq_ready: Set ready status for a virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @ready: ready (true) not ready(false) > + * @get_vq_ready: Get ready status for a virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * Returns boolean: ready (true) or not (false) > + * @set_vq_state: Set the state for a virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * @state: virtqueue state (last_avail_idx) > + * Returns integer: success (0) or error (< 0) > + * @get_vq_state: Get the state for a virtqueue > + * @mdev: mediated device > + * @idx: virtqueue index > + * Returns virtqueue state (last_avail_idx) > + * @get_vq_align: Get the virtqueue align requirement > + * for the device > + * @mdev: mediated device > + * Returns virtqueue algin requirement > + * @get_features: Get virtio features supported by the device > + * @mdev: mediated device > + * Returns the virtio features support by the > + * device > + * @set_features: Set virtio features supported by the driver > + * @mdev: mediated device > + * @features: feature support by the driver > + * Returns integer: success (0) or error (< 0) > + * @set_config_cb: Set the config interrupt callback > + * @mdev: mediated device > + * @cb: virtio-mdev interrupt callback structure > + * @get_vq_num_max: Get the max size of virtqueue > + * @mdev: mediated device > + * Returns u16: max size of virtqueue > + * @get_device_id: Get virtio device id > + * @mdev: mediated device > + * Returns u32: virtio device id > + * @get_vendor_id: Get id for the vendor that provides this device > + * @mdev: mediated device > + * Returns u32: virtio vendor id > + * @get_status: Get the device status > + * @mdev: mediated device > + * Returns u8: virtio device status > + * @set_status: Set the device status > + * @mdev: mediated device > + * @status: virtio device status > + * @get_config: Read from device specific configuration space > + * @mdev: mediated device > + * @offset: offset from the beginning of > + * configuration space > + * @buf: buffer used to read to > + * @len: the length to read from > + * configration space > + * @set_config: Write to device specific configuration space > + * @mdev: mediated device > + * @offset: offset from the beginning of > + * configuration space > + * @buf: buffer used to write from > + * @len: the length to write to > + * configration space > + * @get_generation: Get device config generaton (optional) > + * @mdev: mediated device > + * Returns u32: device generation > + */ > +struct mdev_virtio_device_ops { > + /* Virtqueue ops */ > + int (*set_vq_address)(struct mdev_device *mdev, > + u16 idx, u64 desc_area, u64 driver_area, > + u64 device_area); > + void (*set_vq_num)(struct mdev_device *mdev, u16 idx, u32 num); > + void (*kick_vq)(struct mdev_device *mdev, u16 idx); > + void (*set_vq_cb)(struct mdev_device *mdev, u16 idx, > + struct virtio_mdev_callback *cb); > + void (*set_vq_ready)(struct mdev_device *mdev, u16 idx, bool ready); > + bool (*get_vq_ready)(struct mdev_device *mdev, u16 idx); > + int (*set_vq_state)(struct mdev_device *mdev, u16 idx, u64 state); > + u64 (*get_vq_state)(struct mdev_device *mdev, u16 idx); > + > + /* Virtio device ops */ > + u16 (*get_vq_align)(struct mdev_device *mdev); > + u64 (*get_features)(struct mdev_device *mdev); > + int (*set_features)(struct mdev_device *mdev, u64 features); > + void (*set_config_cb)(struct mdev_device *mdev, > + struct virtio_mdev_callback *cb); > + u16 (*get_vq_num_max)(struct mdev_device *mdev); > + u32 (*get_device_id)(struct mdev_device *mdev); > + u32 (*get_vendor_id)(struct mdev_device *mdev); > + u8 (*get_status)(struct mdev_device *mdev); > + void (*set_status)(struct mdev_device *mdev, u8 status); > + void (*get_config)(struct mdev_device *mdev, unsigned int offset, > + void *buf, unsigned int len); > + void (*set_config)(struct mdev_device *mdev, unsigned int offset, > + const void *buf, unsigned int len); > + u32 (*get_generation)(struct mdev_device *mdev); > +}; > + > +void mdev_set_virtio_ops(struct mdev_device *mdev, > + const struct mdev_virtio_device_ops *virtio_ops); > + > +#endif >