[mirror_ubuntu-jammy-kernel.git] / drivers / virtio / virtio_vdpa.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * VIRTIO based driver for vDPA device
 *
 * Copyright (c) 2020, Red Hat. All rights reserved.
 *     Author: Jason Wang <jasowang@redhat.com>
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/virtio.h>
#include <linux/vdpa.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>

#define MOD_VERSION  "0.1"
#define MOD_AUTHOR   "Jason Wang <jasowang@redhat.com>"
#define MOD_DESC     "vDPA bus driver for virtio devices"
#define MOD_LICENSE  "GPL v2"

struct virtio_vdpa_device {
	struct virtio_device vdev;
	struct vdpa_device *vdpa;
	u64 features;

	/* The lock to protect virtqueue list */
	spinlock_t lock;
	/* List of virtio_vdpa_vq_info */
	struct list_head virtqueues;
};

struct virtio_vdpa_vq_info {
	/* the actual virtqueue */
	struct virtqueue *vq;

	/* the list node for the virtqueues list */
	struct list_head node;
};

static inline struct virtio_vdpa_device *
to_virtio_vdpa_device(struct virtio_device *dev)
{
	return container_of(dev, struct virtio_vdpa_device, vdev);
}

static struct vdpa_device *vd_get_vdpa(struct virtio_device *vdev)
{
	return to_virtio_vdpa_device(vdev)->vdpa;
}

static void virtio_vdpa_get(struct virtio_device *vdev, unsigned offset,
			    void *buf, unsigned len)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);

	vdpa_get_config(vdpa, offset, buf, len);
}

static void virtio_vdpa_set(struct virtio_device *vdev, unsigned offset,
			    const void *buf, unsigned len)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	ops->set_config(vdpa, offset, buf, len);
}

static u32 virtio_vdpa_generation(struct virtio_device *vdev)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	if (ops->get_generation)
		return ops->get_generation(vdpa);

	return 0;
}

static u8 virtio_vdpa_get_status(struct virtio_device *vdev)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->get_status(vdpa);
}

static void virtio_vdpa_set_status(struct virtio_device *vdev, u8 status)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->set_status(vdpa, status);
}

static void virtio_vdpa_reset(struct virtio_device *vdev)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);

	vdpa_reset(vdpa);
}

static bool virtio_vdpa_notify(struct virtqueue *vq)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vq->vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	ops->kick_vq(vdpa, vq->index);

	return true;
}

static irqreturn_t virtio_vdpa_config_cb(void *private)
{
	struct virtio_vdpa_device *vd_dev = private;

	virtio_config_changed(&vd_dev->vdev);

	return IRQ_HANDLED;
}

static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
{
	struct virtio_vdpa_vq_info *info = private;

	return vring_interrupt(0, info->vq);
}

static struct virtqueue *
virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
		     void (*callback)(struct virtqueue *vq),
		     const char *name, bool ctx)
{
	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;
	struct virtio_vdpa_vq_info *info;
	struct vdpa_callback cb;
	struct virtqueue *vq;
	u64 desc_addr, driver_addr, device_addr;
	/* Assume split virtqueue, switch to packed if necessary */
	struct vdpa_vq_state state = {0};
	unsigned long flags;
	u32 align, num;
	int err;

	if (!name)
		return NULL;

	if (index >= vdpa->nvqs)
		return ERR_PTR(-ENOENT);

	/* Queue shouldn't already be set up. */
	if (ops->get_vq_ready(vdpa, index))
		return ERR_PTR(-ENOENT);

	/* Allocate and fill out our active queue description */
	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return ERR_PTR(-ENOMEM);

	num = ops->get_vq_num_max(vdpa);
	if (num == 0) {
		err = -ENOENT;
		goto error_new_virtqueue;
	}

	/* Create the vring */
	align = ops->get_vq_align(vdpa);
	vq = vring_create_virtqueue(index, num, align, vdev,
				    true, true, ctx,
				    virtio_vdpa_notify, callback, name);
	if (!vq) {
		err = -ENOMEM;
		goto error_new_virtqueue;
	}

	/* Setup virtqueue callback */
	cb.callback = virtio_vdpa_virtqueue_cb;
	cb.private = info;
	ops->set_vq_cb(vdpa, index, &cb);
	ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));

	desc_addr = virtqueue_get_desc_addr(vq);
	driver_addr = virtqueue_get_avail_addr(vq);
	device_addr = virtqueue_get_used_addr(vq);

	if (ops->set_vq_address(vdpa, index,
				desc_addr, driver_addr,
				device_addr)) {
		err = -EINVAL;
		goto err_vq;
	}

	/* reset virtqueue state index */
	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
		struct vdpa_vq_state_packed *s = &state.packed;

		s->last_avail_counter = 1;
		s->last_avail_idx = 0;
		s->last_used_counter = 1;
		s->last_used_idx = 0;
	}
	err = ops->set_vq_state(vdpa, index, &state);
	if (err)
		goto err_vq;

	ops->set_vq_ready(vdpa, index, 1);

	vq->priv = info;
	info->vq = vq;

	spin_lock_irqsave(&vd_dev->lock, flags);
	list_add(&info->node, &vd_dev->virtqueues);
	spin_unlock_irqrestore(&vd_dev->lock, flags);

	return vq;

err_vq:
	vring_del_virtqueue(vq);
error_new_virtqueue:
	ops->set_vq_ready(vdpa, index, 0);
	/* VDPA driver should make sure vq is stopeed here */
	WARN_ON(ops->get_vq_ready(vdpa, index));
	kfree(info);
	return ERR_PTR(err);
}

static void virtio_vdpa_del_vq(struct virtqueue *vq)
{
	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev);
	struct vdpa_device *vdpa = vd_dev->vdpa;
	const struct vdpa_config_ops *ops = vdpa->config;
	struct virtio_vdpa_vq_info *info = vq->priv;
	unsigned int index = vq->index;
	unsigned long flags;

	spin_lock_irqsave(&vd_dev->lock, flags);
	list_del(&info->node);
	spin_unlock_irqrestore(&vd_dev->lock, flags);

	/* Select and deactivate the queue (best effort) */
	ops->set_vq_ready(vdpa, index, 0);

	vring_del_virtqueue(vq);

	kfree(info);
}

static void virtio_vdpa_del_vqs(struct virtio_device *vdev)
{
	struct virtqueue *vq, *n;

	list_for_each_entry_safe(vq, n, &vdev->vqs, list)
		virtio_vdpa_del_vq(vq);
}

static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned nvqs,
				struct virtqueue *vqs[],
				vq_callback_t *callbacks[],
				const char * const names[],
				const bool *ctx,
				struct irq_affinity *desc)
{
	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;
	struct vdpa_callback cb;
	int i, err, queue_idx = 0;

	for (i = 0; i < nvqs; ++i) {
		if (!names[i]) {
			vqs[i] = NULL;
			continue;
		}

		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
					      callbacks[i], names[i], ctx ?
					      ctx[i] : false);
		if (IS_ERR(vqs[i])) {
			err = PTR_ERR(vqs[i]);
			goto err_setup_vq;
		}
	}

	cb.callback = virtio_vdpa_config_cb;
	cb.private = vd_dev;
	ops->set_config_cb(vdpa, &cb);

	return 0;

err_setup_vq:
	virtio_vdpa_del_vqs(vdev);
	return err;
}

static u64 virtio_vdpa_get_features(struct virtio_device *vdev)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	const struct vdpa_config_ops *ops = vdpa->config;

	return ops->get_features(vdpa);
}

static int virtio_vdpa_finalize_features(struct virtio_device *vdev)
{
	struct vdpa_device *vdpa = vd_get_vdpa(vdev);

	/* Give virtio_ring a chance to accept features. */
	vring_transport_features(vdev);

	return vdpa_set_features(vdpa, vdev->features);
}

static const char *virtio_vdpa_bus_name(struct virtio_device *vdev)
{
	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	struct vdpa_device *vdpa = vd_dev->vdpa;

	return dev_name(&vdpa->dev);
}

static const struct virtio_config_ops virtio_vdpa_config_ops = {
	.get		= virtio_vdpa_get,
	.set		= virtio_vdpa_set,
	.generation	= virtio_vdpa_generation,
	.get_status	= virtio_vdpa_get_status,
	.set_status	= virtio_vdpa_set_status,
	.reset		= virtio_vdpa_reset,
	.find_vqs	= virtio_vdpa_find_vqs,
	.del_vqs	= virtio_vdpa_del_vqs,
	.get_features	= virtio_vdpa_get_features,
	.finalize_features = virtio_vdpa_finalize_features,
	.bus_name	= virtio_vdpa_bus_name,
};

static void virtio_vdpa_release_dev(struct device *_d)
{
	struct virtio_device *vdev =
	       container_of(_d, struct virtio_device, dev);
	struct virtio_vdpa_device *vd_dev =
	       container_of(vdev, struct virtio_vdpa_device, vdev);

	kfree(vd_dev);
}

static int virtio_vdpa_probe(struct vdpa_device *vdpa)
{
	const struct vdpa_config_ops *ops = vdpa->config;
	struct virtio_vdpa_device *vd_dev, *reg_dev = NULL;
	int ret = -EINVAL;

	vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL);
	if (!vd_dev)
		return -ENOMEM;

	vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa);
	vd_dev->vdev.dev.release = virtio_vdpa_release_dev;
	vd_dev->vdev.config = &virtio_vdpa_config_ops;
	vd_dev->vdpa = vdpa;
	INIT_LIST_HEAD(&vd_dev->virtqueues);
	spin_lock_init(&vd_dev->lock);

	vd_dev->vdev.id.device = ops->get_device_id(vdpa);
	if (vd_dev->vdev.id.device == 0)
		goto err;

	vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa);
	ret = register_virtio_device(&vd_dev->vdev);
	reg_dev = vd_dev;
	if (ret)
		goto err;

	vdpa_set_drvdata(vdpa, vd_dev);

	return 0;

err:
	if (reg_dev)
		put_device(&vd_dev->vdev.dev);
	else
		kfree(vd_dev);
	return ret;
}

static void virtio_vdpa_remove(struct vdpa_device *vdpa)
{
	struct virtio_vdpa_device *vd_dev = vdpa_get_drvdata(vdpa);

	unregister_virtio_device(&vd_dev->vdev);
}

static struct vdpa_driver virtio_vdpa_driver = {
	.driver = {
		.name	= "virtio_vdpa",
	},
	.probe	= virtio_vdpa_probe,
	.remove = virtio_vdpa_remove,
};

module_vdpa_driver(virtio_vdpa_driver);

MODULE_VERSION(MOD_VERSION);
MODULE_LICENSE(MOD_LICENSE);
MODULE_AUTHOR(MOD_AUTHOR);
MODULE_DESCRIPTION(MOD_DESC);
Commit	Line	Data
c043b4a8 JW	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* VIRTIO based driver for vDPA device
	4	*
	5	* Copyright (c) 2020, Red Hat. All rights reserved.
	6	* Author: Jason Wang <jasowang@redhat.com>
	7	*
	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/device.h>
	13	#include <linux/kernel.h>
	14	#include <linux/slab.h>
	15	#include <linux/uuid.h>
	16	#include <linux/virtio.h>
	17	#include <linux/vdpa.h>
	18	#include <linux/virtio_config.h>
	19	#include <linux/virtio_ring.h>
	20
	21	#define MOD_VERSION "0.1"
	22	#define MOD_AUTHOR "Jason Wang <jasowang@redhat.com>"
	23	#define MOD_DESC "vDPA bus driver for virtio devices"
	24	#define MOD_LICENSE "GPL v2"
	25
	26	struct virtio_vdpa_device {
	27	struct virtio_device vdev;
	28	struct vdpa_device *vdpa;
	29	u64 features;
	30
	31	/* The lock to protect virtqueue list */
	32	spinlock_t lock;
	33	/* List of virtio_vdpa_vq_info */
	34	struct list_head virtqueues;
	35	};
	36
	37	struct virtio_vdpa_vq_info {
	38	/* the actual virtqueue */
	39	struct virtqueue *vq;
	40
	41	/* the list node for the virtqueues list */
	42	struct list_head node;
	43	};
	44
	45	static inline struct virtio_vdpa_device *
	46	to_virtio_vdpa_device(struct virtio_device *dev)
	47	{
	48	return container_of(dev, struct virtio_vdpa_device, vdev);
	49	}
	50
	51	static struct vdpa_device vd_get_vdpa(struct virtio_device vdev)
	52	{
	53	return to_virtio_vdpa_device(vdev)->vdpa;
	54	}
	55
	56	static void virtio_vdpa_get(struct virtio_device *vdev, unsigned offset,
	57	void *buf, unsigned len)
	58	{
	59	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
c043b4a8	60
63991673	61	vdpa_get_config(vdpa, offset, buf, len);
c043b4a8 JW	62	}
	63
	64	static void virtio_vdpa_set(struct virtio_device *vdev, unsigned offset,
	65	const void *buf, unsigned len)
	66	{
	67	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	68	const struct vdpa_config_ops *ops = vdpa->config;
	69
	70	ops->set_config(vdpa, offset, buf, len);
	71	}
	72
	73	static u32 virtio_vdpa_generation(struct virtio_device *vdev)
	74	{
	75	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	76	const struct vdpa_config_ops *ops = vdpa->config;
	77
	78	if (ops->get_generation)
	79	return ops->get_generation(vdpa);
	80
	81	return 0;
	82	}
	83
	84	static u8 virtio_vdpa_get_status(struct virtio_device *vdev)
	85	{
	86	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	87	const struct vdpa_config_ops *ops = vdpa->config;
	88
	89	return ops->get_status(vdpa);
	90	}
	91
	92	static void virtio_vdpa_set_status(struct virtio_device *vdev, u8 status)
	93	{
	94	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	95	const struct vdpa_config_ops *ops = vdpa->config;
	96
	97	return ops->set_status(vdpa, status);
	98	}
	99
	100	static void virtio_vdpa_reset(struct virtio_device *vdev)
	101	{
	102	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
c043b4a8	103
63991673	104	vdpa_reset(vdpa);
c043b4a8 JW	105	}
	106
	107	static bool virtio_vdpa_notify(struct virtqueue *vq)
	108	{
	109	struct vdpa_device *vdpa = vd_get_vdpa(vq->vdev);
	110	const struct vdpa_config_ops *ops = vdpa->config;
	111
	112	ops->kick_vq(vdpa, vq->index);
	113
	114	return true;
	115	}
	116
	117	static irqreturn_t virtio_vdpa_config_cb(void *private)
	118	{
	119	struct virtio_vdpa_device *vd_dev = private;
	120
	121	virtio_config_changed(&vd_dev->vdev);
	122
	123	return IRQ_HANDLED;
	124	}
	125
	126	static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
	127	{
	128	struct virtio_vdpa_vq_info *info = private;
	129
	130	return vring_interrupt(0, info->vq);
	131	}
	132
	133	static struct virtqueue *
	134	virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
	135	void (callback)(struct virtqueue vq),
	136	const char *name, bool ctx)
	137	{
	138	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	139	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	140	const struct vdpa_config_ops *ops = vdpa->config;
	141	struct virtio_vdpa_vq_info *info;
	142	struct vdpa_callback cb;
	143	struct virtqueue *vq;
	144	u64 desc_addr, driver_addr, device_addr;
efa08cb4 EC	145	/* Assume split virtqueue, switch to packed if necessary */
efa08cb4 EC	146	struct vdpa_vq_state state = {0};
c043b4a8 JW	147	unsigned long flags;
	148	u32 align, num;
	149	int err;
	150
	151	if (!name)
	152	return NULL;
	153
cb5d2c1f VW	154	if (index >= vdpa->nvqs)
	155	return ERR_PTR(-ENOENT);
	156
c043b4a8 JW	157	/* Queue shouldn't already be set up. */
	158	if (ops->get_vq_ready(vdpa, index))
	159	return ERR_PTR(-ENOENT);
	160
	161	/* Allocate and fill out our active queue description */
	162	info = kmalloc(sizeof(*info), GFP_KERNEL);
	163	if (!info)
	164	return ERR_PTR(-ENOMEM);
	165
	166	num = ops->get_vq_num_max(vdpa);
	167	if (num == 0) {
	168	err = -ENOENT;
	169	goto error_new_virtqueue;
	170	}
	171
	172	/* Create the vring */
	173	align = ops->get_vq_align(vdpa);
	174	vq = vring_create_virtqueue(index, num, align, vdev,
	175	true, true, ctx,
	176	virtio_vdpa_notify, callback, name);
	177	if (!vq) {
	178	err = -ENOMEM;
	179	goto error_new_virtqueue;
	180	}
	181
	182	/* Setup virtqueue callback */
	183	cb.callback = virtio_vdpa_virtqueue_cb;
	184	cb.private = info;
	185	ops->set_vq_cb(vdpa, index, &cb);
	186	ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));
	187
	188	desc_addr = virtqueue_get_desc_addr(vq);
	189	driver_addr = virtqueue_get_avail_addr(vq);
	190	device_addr = virtqueue_get_used_addr(vq);
	191
	192	if (ops->set_vq_address(vdpa, index,
	193	desc_addr, driver_addr,
	194	device_addr)) {
	195	err = -EINVAL;
	196	goto err_vq;
	197	}
	198
efa08cb4 EC	199	/* reset virtqueue state index */
	200	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
	201	struct vdpa_vq_state_packed *s = &state.packed;
	202
	203	s->last_avail_counter = 1;
	204	s->last_avail_idx = 0;
	205	s->last_used_counter = 1;
	206	s->last_used_idx = 0;
	207	}
	208	err = ops->set_vq_state(vdpa, index, &state);
	209	if (err)
	210	goto err_vq;
	211
c043b4a8 JW	212	ops->set_vq_ready(vdpa, index, 1);
	213
	214	vq->priv = info;
	215	info->vq = vq;
	216
	217	spin_lock_irqsave(&vd_dev->lock, flags);
	218	list_add(&info->node, &vd_dev->virtqueues);
	219	spin_unlock_irqrestore(&vd_dev->lock, flags);
	220
	221	return vq;
	222
	223	err_vq:
	224	vring_del_virtqueue(vq);
	225	error_new_virtqueue:
	226	ops->set_vq_ready(vdpa, index, 0);
	227	/* VDPA driver should make sure vq is stopeed here */
	228	WARN_ON(ops->get_vq_ready(vdpa, index));
	229	kfree(info);
	230	return ERR_PTR(err);
	231	}
	232
	233	static void virtio_vdpa_del_vq(struct virtqueue *vq)
	234	{
	235	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev);
	236	struct vdpa_device *vdpa = vd_dev->vdpa;
	237	const struct vdpa_config_ops *ops = vdpa->config;
	238	struct virtio_vdpa_vq_info *info = vq->priv;
	239	unsigned int index = vq->index;
	240	unsigned long flags;
	241
	242	spin_lock_irqsave(&vd_dev->lock, flags);
	243	list_del(&info->node);
	244	spin_unlock_irqrestore(&vd_dev->lock, flags);
	245
1628c687	246	/* Select and deactivate the queue (best effort) */
c043b4a8	247	ops->set_vq_ready(vdpa, index, 0);
c043b4a8 JW	248
	249	vring_del_virtqueue(vq);
	250
	251	kfree(info);
	252	}
	253
	254	static void virtio_vdpa_del_vqs(struct virtio_device *vdev)
	255	{
	256	struct virtqueue vq, n;
	257
	258	list_for_each_entry_safe(vq, n, &vdev->vqs, list)
	259	virtio_vdpa_del_vq(vq);
	260	}
	261
	262	static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned nvqs,
	263	struct virtqueue *vqs[],
	264	vq_callback_t *callbacks[],
	265	const char * const names[],
	266	const bool *ctx,
	267	struct irq_affinity *desc)
	268	{
	269	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	270	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	271	const struct vdpa_config_ops *ops = vdpa->config;
	272	struct vdpa_callback cb;
	273	int i, err, queue_idx = 0;
	274
	275	for (i = 0; i < nvqs; ++i) {
	276	if (!names[i]) {
	277	vqs[i] = NULL;
	278	continue;
	279	}
	280
	281	vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
	282	callbacks[i], names[i], ctx ?
	283	ctx[i] : false);
	284	if (IS_ERR(vqs[i])) {
	285	err = PTR_ERR(vqs[i]);
	286	goto err_setup_vq;
	287	}
	288	}
	289
	290	cb.callback = virtio_vdpa_config_cb;
	291	cb.private = vd_dev;
	292	ops->set_config_cb(vdpa, &cb);
	293
	294	return 0;
	295
	296	err_setup_vq:
	297	virtio_vdpa_del_vqs(vdev);
	298	return err;
	299	}
	300
	301	static u64 virtio_vdpa_get_features(struct virtio_device *vdev)
	302	{
	303	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
	304	const struct vdpa_config_ops *ops = vdpa->config;
	305
	306	return ops->get_features(vdpa);
	307	}
	308
	309	static int virtio_vdpa_finalize_features(struct virtio_device *vdev)
	310	{
	311	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
c043b4a8 JW	312
	313	/* Give virtio_ring a chance to accept features. */
	314	vring_transport_features(vdev);
	315
63991673	316	return vdpa_set_features(vdpa, vdev->features);
c043b4a8 JW	317	}
	318
	319	static const char virtio_vdpa_bus_name(struct virtio_device vdev)
	320	{
	321	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
	322	struct vdpa_device *vdpa = vd_dev->vdpa;
	323
	324	return dev_name(&vdpa->dev);
	325	}
	326
	327	static const struct virtio_config_ops virtio_vdpa_config_ops = {
	328	.get = virtio_vdpa_get,
	329	.set = virtio_vdpa_set,
	330	.generation = virtio_vdpa_generation,
	331	.get_status = virtio_vdpa_get_status,
	332	.set_status = virtio_vdpa_set_status,
	333	.reset = virtio_vdpa_reset,
	334	.find_vqs = virtio_vdpa_find_vqs,
	335	.del_vqs = virtio_vdpa_del_vqs,
	336	.get_features = virtio_vdpa_get_features,
	337	.finalize_features = virtio_vdpa_finalize_features,
	338	.bus_name = virtio_vdpa_bus_name,
	339	};
	340
	341	static void virtio_vdpa_release_dev(struct device *_d)
	342	{
	343	struct virtio_device *vdev =
	344	container_of(_d, struct virtio_device, dev);
	345	struct virtio_vdpa_device *vd_dev =
	346	container_of(vdev, struct virtio_vdpa_device, vdev);
	347
	348	kfree(vd_dev);
	349	}
	350
	351	static int virtio_vdpa_probe(struct vdpa_device *vdpa)
	352	{
	353	const struct vdpa_config_ops *ops = vdpa->config;
	354	struct virtio_vdpa_device vd_dev, reg_dev = NULL;
	355	int ret = -EINVAL;
	356
	357	vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL);
	358	if (!vd_dev)
	359	return -ENOMEM;
	360
	361	vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa);
	362	vd_dev->vdev.dev.release = virtio_vdpa_release_dev;
	363	vd_dev->vdev.config = &virtio_vdpa_config_ops;
	364	vd_dev->vdpa = vdpa;
	365	INIT_LIST_HEAD(&vd_dev->virtqueues);
	366	spin_lock_init(&vd_dev->lock);
	367
	368	vd_dev->vdev.id.device = ops->get_device_id(vdpa);
	369	if (vd_dev->vdev.id.device == 0)
	370	goto err;
	371
	372	vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa);
	373	ret = register_virtio_device(&vd_dev->vdev);
	374	reg_dev = vd_dev;
	375	if (ret)
	376	goto err;
	377
	378	vdpa_set_drvdata(vdpa, vd_dev);
	379
	380	return 0;
381
382	err:
383	if (reg_dev)
384	put_device(&vd_dev->vdev.dev);
385	else
386	kfree(vd_dev);
387	return ret;
388	}
389
390	static void virtio_vdpa_remove(struct vdpa_device *vdpa)
391	{
392	struct virtio_vdpa_device *vd_dev = vdpa_get_drvdata(vdpa);
393
394	unregister_virtio_device(&vd_dev->vdev);
395	}
396
397	static struct vdpa_driver virtio_vdpa_driver = {
398	.driver = {
399	.name = "virtio_vdpa",
400	},
401	.probe = virtio_vdpa_probe,
402	.remove = virtio_vdpa_remove,
403	};
404
405	module_vdpa_driver(virtio_vdpa_driver);
406
407	MODULE_VERSION(MOD_VERSION);
408	MODULE_LICENSE(MOD_LICENSE);
409	MODULE_AUTHOR(MOD_AUTHOR);
410	MODULE_DESCRIPTION(MOD_DESC);