[linux-2.6-block.git] / drivers / virtio / virtio_pci_legacy.c

/*
 * Virtio PCI driver
 *
 * This module allows virtio devices to be used over a virtual PCI device.
 * This can be used with QEMU based VMMs like KVM or Xen.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors:
 *  Anthony Liguori  <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "virtio_pci.h"

/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
static const struct pci_device_id virtio_pci_id_table[] = {
	{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
	{ 0 }
};

MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);

/* virtio config->get_features() implementation */
static u64 vp_get_features(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

	/* When someone needs more than 32 feature bits, we'll need to
	 * steal a bit to indicate that the rest are somewhere else. */
	return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
}

/* virtio config->finalize_features() implementation */
static int vp_finalize_features(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

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

	/* Make sure we don't have any features > 32 bits! */
	BUG_ON((u32)vdev->features != vdev->features);

	/* We only support 32 feature bits. */
	iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);

	return 0;
}

/* virtio config->get() implementation */
static void vp_get(struct virtio_device *vdev, unsigned offset,
		   void *buf, unsigned len)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	void __iomem *ioaddr = vp_dev->ioaddr +
				VIRTIO_PCI_CONFIG(vp_dev) + offset;
	u8 *ptr = buf;
	int i;

	for (i = 0; i < len; i++)
		ptr[i] = ioread8(ioaddr + i);
}

/* the config->set() implementation.  it's symmetric to the config->get()
 * implementation */
static void vp_set(struct virtio_device *vdev, unsigned offset,
		   const void *buf, unsigned len)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	void __iomem *ioaddr = vp_dev->ioaddr +
				VIRTIO_PCI_CONFIG(vp_dev) + offset;
	const u8 *ptr = buf;
	int i;

	for (i = 0; i < len; i++)
		iowrite8(ptr[i], ioaddr + i);
}

/* config->{get,set}_status() implementations */
static u8 vp_get_status(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}

static void vp_set_status(struct virtio_device *vdev, u8 status)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	/* We should never be setting status to 0. */
	BUG_ON(status == 0);
	iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}

static void vp_reset(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	/* 0 status means a reset. */
	iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
	/* Flush out the status write, and flush in device writes,
	 * including MSi-X interrupts, if any. */
	ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
	/* Flush pending VQ/configuration callbacks. */
	vp_synchronize_vectors(vdev);
}

static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
	/* Setup the vector used for configuration events */
	iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
	/* Verify we had enough resources to assign the vector */
	/* Will also flush the write out to device */
	return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
}

static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
				  struct virtio_pci_vq_info *info,
				  unsigned index,
				  void (*callback)(struct virtqueue *vq),
				  const char *name,
				  u16 msix_vec)
{
	struct virtqueue *vq;
	unsigned long size;
	u16 num;
	int err;

	/* Select the queue we're interested in */
	iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);

	/* Check if queue is either not available or already active. */
	num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
	if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
		return ERR_PTR(-ENOENT);

	info->num = num;
	info->msix_vector = msix_vec;

	size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
	info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
	if (info->queue == NULL)
		return ERR_PTR(-ENOMEM);

	/* activate the queue */
	iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
		  vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);

	/* create the vring */
	vq = vring_new_virtqueue(index, info->num,
				 VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
				 true, info->queue, vp_notify, callback, name);
	if (!vq) {
		err = -ENOMEM;
		goto out_activate_queue;
	}

	vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;

	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
		iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
		msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
		if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
			err = -EBUSY;
			goto out_assign;
		}
	}

	return vq;

out_assign:
	vring_del_virtqueue(vq);
out_activate_queue:
	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
	free_pages_exact(info->queue, size);
	return ERR_PTR(err);
}

static void del_vq(struct virtio_pci_vq_info *info)
{
	struct virtqueue *vq = info->vq;
	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
	unsigned long size;

	iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);

	if (vp_dev->msix_enabled) {
		iowrite16(VIRTIO_MSI_NO_VECTOR,
			  vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
		/* Flush the write out to device */
		ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
	}

	vring_del_virtqueue(vq);

	/* Select and deactivate the queue */
	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);

	size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
	free_pages_exact(info->queue, size);
}

static const struct virtio_config_ops virtio_pci_config_ops = {
	.get		= vp_get,
	.set		= vp_set,
	.get_status	= vp_get_status,
	.set_status	= vp_set_status,
	.reset		= vp_reset,
	.find_vqs	= vp_find_vqs,
	.del_vqs	= vp_del_vqs,
	.get_features	= vp_get_features,
	.finalize_features = vp_finalize_features,
	.bus_name	= vp_bus_name,
	.set_vq_affinity = vp_set_vq_affinity,
};

/* the PCI probing function */
static int virtio_pci_probe(struct pci_dev *pci_dev,
			    const struct pci_device_id *id)
{
	struct virtio_pci_device *vp_dev;
	int err;

	/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
	if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
		return -ENODEV;

	if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
		printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
		       VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
		return -ENODEV;
	}

	/* allocate our structure and fill it out */
	vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
	if (vp_dev == NULL)
		return -ENOMEM;

	vp_dev->vdev.dev.parent = &pci_dev->dev;
	vp_dev->vdev.dev.release = virtio_pci_release_dev;
	vp_dev->vdev.config = &virtio_pci_config_ops;
	vp_dev->pci_dev = pci_dev;
	INIT_LIST_HEAD(&vp_dev->virtqueues);
	spin_lock_init(&vp_dev->lock);

	/* Disable MSI/MSIX to bring device to a known good state. */
	pci_msi_off(pci_dev);

	/* enable the device */
	err = pci_enable_device(pci_dev);
	if (err)
		goto out;

	err = pci_request_regions(pci_dev, "virtio-pci");
	if (err)
		goto out_enable_device;

	vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
	if (vp_dev->ioaddr == NULL) {
		err = -ENOMEM;
		goto out_req_regions;
	}

	vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;

	pci_set_drvdata(pci_dev, vp_dev);
	pci_set_master(pci_dev);

	/* we use the subsystem vendor/device id as the virtio vendor/device
	 * id.  this allows us to use the same PCI vendor/device id for all
	 * virtio devices and to identify the particular virtio driver by
	 * the subsystem ids */
	vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
	vp_dev->vdev.id.device = pci_dev->subsystem_device;

	vp_dev->config_vector = vp_config_vector;
	vp_dev->setup_vq = setup_vq;
	vp_dev->del_vq = del_vq;

	/* finally register the virtio device */
	err = register_virtio_device(&vp_dev->vdev);
	if (err)
		goto out_set_drvdata;

	return 0;

out_set_drvdata:
	pci_iounmap(pci_dev, vp_dev->ioaddr);
out_req_regions:
	pci_release_regions(pci_dev);
out_enable_device:
	pci_disable_device(pci_dev);
out:
	kfree(vp_dev);
	return err;
}

static void virtio_pci_remove(struct pci_dev *pci_dev)
{
	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);

	unregister_virtio_device(&vp_dev->vdev);

	vp_del_vqs(&vp_dev->vdev);
	pci_iounmap(pci_dev, vp_dev->ioaddr);
	pci_release_regions(pci_dev);
	pci_disable_device(pci_dev);
	kfree(vp_dev);
}

static struct pci_driver virtio_pci_driver = {
	.name		= "virtio-pci",
	.id_table	= virtio_pci_id_table,
	.probe		= virtio_pci_probe,
	.remove		= virtio_pci_remove,
#ifdef CONFIG_PM_SLEEP
	.driver.pm	= &virtio_pci_pm_ops,
#endif
};

module_pci_driver(virtio_pci_driver);
Commit	Line	Data
38eb4a29 MT	1	/*
	2	* Virtio PCI driver
	3	*
	4	* This module allows virtio devices to be used over a virtual PCI device.
	5	* This can be used with QEMU based VMMs like KVM or Xen.
	6	*
	7	* Copyright IBM Corp. 2007
	8	*
	9	* Authors:
	10	* Anthony Liguori <aliguori@us.ibm.com>
	11	*
	12	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	13	* See the COPYING file in the top-level directory.
	14	*
	15	*/
	16
	17	#include "virtio_pci.h"
	18
	19	/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
	20	static const struct pci_device_id virtio_pci_id_table[] = {
	21	{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
	22	{ 0 }
	23	};
	24
	25	MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
	26
	27	/* virtio config->get_features() implementation */
	28	static u64 vp_get_features(struct virtio_device *vdev)
	29	{
	30	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	31
	32	/* When someone needs more than 32 feature bits, we'll need to
	33	* steal a bit to indicate that the rest are somewhere else. */
	34	return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
	35	}
	36
	37	/* virtio config->finalize_features() implementation */
	38	static int vp_finalize_features(struct virtio_device *vdev)
	39	{
	40	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	41
	42	/* Give virtio_ring a chance to accept features. */
	43	vring_transport_features(vdev);
	44
	45	/* Make sure we don't have any features > 32 bits! */
	46	BUG_ON((u32)vdev->features != vdev->features);
	47
	48	/* We only support 32 feature bits. */
	49	iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
	50
	51	return 0;
	52	}
	53
	54	/* virtio config->get() implementation */
	55	static void vp_get(struct virtio_device *vdev, unsigned offset,
	56	void *buf, unsigned len)
	57	{
	58	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	59	void __iomem *ioaddr = vp_dev->ioaddr +
	60	VIRTIO_PCI_CONFIG(vp_dev) + offset;
	61	u8 *ptr = buf;
	62	int i;
	63
	64	for (i = 0; i < len; i++)
65	ptr[i] = ioread8(ioaddr + i);
66	}
67
68	/* the config->set() implementation. it's symmetric to the config->get()
69	* implementation */
70	static void vp_set(struct virtio_device *vdev, unsigned offset,
71	const void *buf, unsigned len)
72	{
73	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
74	void __iomem *ioaddr = vp_dev->ioaddr +
75	VIRTIO_PCI_CONFIG(vp_dev) + offset;
76	const u8 *ptr = buf;
77	int i;
78
79	for (i = 0; i < len; i++)
80	iowrite8(ptr[i], ioaddr + i);
81	}
82
83	/* config->{get,set}_status() implementations */
84	static u8 vp_get_status(struct virtio_device *vdev)
85	{
86	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
87	return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
88	}
89
90	static void vp_set_status(struct virtio_device *vdev, u8 status)
91	{
92	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
93	/* We should never be setting status to 0. */
94	BUG_ON(status == 0);
95	iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
96	}
97
98	static void vp_reset(struct virtio_device *vdev)
99	{
100	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
101	/* 0 status means a reset. */
102	iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
103	/* Flush out the status write, and flush in device writes,
104	* including MSi-X interrupts, if any. */
105	ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
106	/* Flush pending VQ/configuration callbacks. */
107	vp_synchronize_vectors(vdev);
108	}
109
110	static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
111	{
112	/* Setup the vector used for configuration events */
113	iowrite16(vector, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
114	/* Verify we had enough resources to assign the vector */
115	/* Will also flush the write out to device */
116	return ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
117	}
118
119	static struct virtqueue setup_vq(struct virtio_pci_device vp_dev,
120	struct virtio_pci_vq_info *info,
121	unsigned index,
122	void (callback)(struct virtqueue vq),
123	const char *name,
124	u16 msix_vec)
125	{
126	struct virtqueue *vq;
127	unsigned long size;
128	u16 num;
129	int err;
130
131	/* Select the queue we're interested in */
132	iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
133
134	/* Check if queue is either not available or already active. */
135	num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
136	if (!num \|\| ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
137	return ERR_PTR(-ENOENT);
138
139	info->num = num;
140	info->msix_vector = msix_vec;
141
142	size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
143	info->queue = alloc_pages_exact(size, GFP_KERNEL\|__GFP_ZERO);
144	if (info->queue == NULL)
145	return ERR_PTR(-ENOMEM);
146
147	/* activate the queue */
148	iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
149	vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
150
151	/* create the vring */
152	vq = vring_new_virtqueue(index, info->num,
153	VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
154	true, info->queue, vp_notify, callback, name);
155	if (!vq) {
156	err = -ENOMEM;
157	goto out_activate_queue;
158	}
159
160	vq->priv = (void __force *)vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY;
161
162	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
163	iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
164	msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
165	if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
166	err = -EBUSY;
167	goto out_assign;
168	}
169	}
170
171	return vq;
172
173	out_assign:
174	vring_del_virtqueue(vq);
175	out_activate_queue:
176	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
177	free_pages_exact(info->queue, size);
178	return ERR_PTR(err);
179	}
180
181	static void del_vq(struct virtio_pci_vq_info *info)
182	{
183	struct virtqueue *vq = info->vq;
184	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
185	unsigned long size;
186
187	iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
188
189	if (vp_dev->msix_enabled) {
190	iowrite16(VIRTIO_MSI_NO_VECTOR,
191	vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
192	/* Flush the write out to device */
193	ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
194	}
195
196	vring_del_virtqueue(vq);
197
198	/* Select and deactivate the queue */
199	iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
200
201	size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
202	free_pages_exact(info->queue, size);
203	}
204
205	static const struct virtio_config_ops virtio_pci_config_ops = {
206	.get = vp_get,
207	.set = vp_set,
208	.get_status = vp_get_status,
209	.set_status = vp_set_status,
210	.reset = vp_reset,
211	.find_vqs = vp_find_vqs,
212	.del_vqs = vp_del_vqs,
213	.get_features = vp_get_features,
214	.finalize_features = vp_finalize_features,
215	.bus_name = vp_bus_name,
216	.set_vq_affinity = vp_set_vq_affinity,
217	};
218
219	/* the PCI probing function */
220	static int virtio_pci_probe(struct pci_dev *pci_dev,
221	const struct pci_device_id *id)
222	{
223	struct virtio_pci_device *vp_dev;
224	int err;
225
226	/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
227	if (pci_dev->device < 0x1000 \|\| pci_dev->device > 0x103f)
228	return -ENODEV;
229
230	if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
231	printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
232	VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
233	return -ENODEV;
234	}
235
236	/* allocate our structure and fill it out */
237	vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
238	if (vp_dev == NULL)
239	return -ENOMEM;
240
241	vp_dev->vdev.dev.parent = &pci_dev->dev;
242	vp_dev->vdev.dev.release = virtio_pci_release_dev;
243	vp_dev->vdev.config = &virtio_pci_config_ops;
244	vp_dev->pci_dev = pci_dev;
245	INIT_LIST_HEAD(&vp_dev->virtqueues);
246	spin_lock_init(&vp_dev->lock);
247
248	/* Disable MSI/MSIX to bring device to a known good state. */
249	pci_msi_off(pci_dev);
250
251	/* enable the device */
252	err = pci_enable_device(pci_dev);
253	if (err)
254	goto out;
255
256	err = pci_request_regions(pci_dev, "virtio-pci");
257	if (err)
258	goto out_enable_device;
259
260	vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
261	if (vp_dev->ioaddr == NULL) {
262	err = -ENOMEM;
263	goto out_req_regions;
264	}
265
266	vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
267
268	pci_set_drvdata(pci_dev, vp_dev);
269	pci_set_master(pci_dev);
270
271	/* we use the subsystem vendor/device id as the virtio vendor/device
272	* id. this allows us to use the same PCI vendor/device id for all
273	* virtio devices and to identify the particular virtio driver by
274	* the subsystem ids */
275	vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
276	vp_dev->vdev.id.device = pci_dev->subsystem_device;
277
278	vp_dev->config_vector = vp_config_vector;
279	vp_dev->setup_vq = setup_vq;
280	vp_dev->del_vq = del_vq;
281
282	/* finally register the virtio device */
283	err = register_virtio_device(&vp_dev->vdev);
284	if (err)
285	goto out_set_drvdata;
286
287	return 0;
288
289	out_set_drvdata:
290	pci_iounmap(pci_dev, vp_dev->ioaddr);
291	out_req_regions:
292	pci_release_regions(pci_dev);
293	out_enable_device:
294	pci_disable_device(pci_dev);
295	out:
296	kfree(vp_dev);
297	return err;
298	}
299
300	static void virtio_pci_remove(struct pci_dev *pci_dev)
301	{
302	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
303
304	unregister_virtio_device(&vp_dev->vdev);
305
306	vp_del_vqs(&vp_dev->vdev);
307	pci_iounmap(pci_dev, vp_dev->ioaddr);
308	pci_release_regions(pci_dev);
309	pci_disable_device(pci_dev);
310	kfree(vp_dev);
311	}
312
313	static struct pci_driver virtio_pci_driver = {
314	.name = "virtio-pci",
315	.id_table = virtio_pci_id_table,
316	.probe = virtio_pci_probe,
317	.remove = virtio_pci_remove,
318	#ifdef CONFIG_PM_SLEEP
319	.driver.pm = &virtio_pci_pm_ops,
320	#endif
321	};
322
323	module_pci_driver(virtio_pci_driver);