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.
7 * Copyright IBM Corp. 2007
10 * Anthony Liguori <aliguori@us.ibm.com>
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.
17 #include <linux/module.h>
18 #include <linux/list.h>
19 #include <linux/pci.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/virtio.h>
23 #include <linux/virtio_config.h>
24 #include <linux/virtio_ring.h>
25 #include <linux/virtio_pci.h>
26 #include <linux/highmem.h>
27 #include <linux/spinlock.h>
29 MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
30 MODULE_DESCRIPTION("virtio-pci");
31 MODULE_LICENSE("GPL");
34 /* Our device structure */
35 struct virtio_pci_device
37 struct virtio_device vdev;
38 struct pci_dev *pci_dev;
40 /* the IO mapping for the PCI config space */
43 /* a list of queues so we can dispatch IRQs */
45 struct list_head virtqueues;
50 struct msix_entry *msix_entries;
51 cpumask_var_t *msix_affinity_masks;
52 /* Name strings for interrupts. This size should be enough,
53 * and I'm too lazy to allocate each name separately. */
54 char (*msix_names)[256];
55 /* Number of available vectors */
56 unsigned msix_vectors;
57 /* Vectors allocated, excluding per-vq vectors if any */
58 unsigned msix_used_vectors;
60 /* Status saved during hibernate/restore */
63 /* Whether we have vector per vq */
67 /* Constants for MSI-X */
68 /* Use first vector for configuration changes, second and the rest for
69 * virtqueues Thus, we need at least 2 vectors for MSI. */
71 VP_MSIX_CONFIG_VECTOR = 0,
72 VP_MSIX_VQ_VECTOR = 1,
75 struct virtio_pci_vq_info
77 /* the actual virtqueue */
80 /* the number of entries in the queue */
83 /* the virtual address of the ring queue */
86 /* the list node for the virtqueues list */
87 struct list_head node;
89 /* MSI-X vector (or none) */
93 /* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
94 static DEFINE_PCI_DEVICE_TABLE(virtio_pci_id_table) = {
95 { PCI_DEVICE(0x1af4, PCI_ANY_ID) },
99 MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
101 /* Convert a generic virtio device to our structure */
102 static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
104 return container_of(vdev, struct virtio_pci_device, vdev);
107 /* virtio config->get_features() implementation */
108 static u32 vp_get_features(struct virtio_device *vdev)
110 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
112 /* When someone needs more than 32 feature bits, we'll need to
113 * steal a bit to indicate that the rest are somewhere else. */
114 return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
117 /* virtio config->finalize_features() implementation */
118 static void vp_finalize_features(struct virtio_device *vdev)
120 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
122 /* Give virtio_ring a chance to accept features. */
123 vring_transport_features(vdev);
125 /* We only support 32 feature bits. */
126 BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
127 iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
130 /* virtio config->get() implementation */
131 static void vp_get(struct virtio_device *vdev, unsigned offset,
132 void *buf, unsigned len)
134 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
135 void __iomem *ioaddr = vp_dev->ioaddr +
136 VIRTIO_PCI_CONFIG(vp_dev) + offset;
140 for (i = 0; i < len; i++)
141 ptr[i] = ioread8(ioaddr + i);
144 /* the config->set() implementation. it's symmetric to the config->get()
146 static void vp_set(struct virtio_device *vdev, unsigned offset,
147 const void *buf, unsigned len)
149 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
150 void __iomem *ioaddr = vp_dev->ioaddr +
151 VIRTIO_PCI_CONFIG(vp_dev) + offset;
155 for (i = 0; i < len; i++)
156 iowrite8(ptr[i], ioaddr + i);
159 /* config->{get,set}_status() implementations */
160 static u8 vp_get_status(struct virtio_device *vdev)
162 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
163 return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
166 static void vp_set_status(struct virtio_device *vdev, u8 status)
168 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
169 /* We should never be setting status to 0. */
171 iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
174 /* wait for pending irq handlers */
175 static void vp_synchronize_vectors(struct virtio_device *vdev)
177 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
180 if (vp_dev->intx_enabled)
181 synchronize_irq(vp_dev->pci_dev->irq);
183 for (i = 0; i < vp_dev->msix_vectors; ++i)
184 synchronize_irq(vp_dev->msix_entries[i].vector);
187 static void vp_reset(struct virtio_device *vdev)
189 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
190 /* 0 status means a reset. */
191 iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
192 /* Flush out the status write, and flush in device writes,
193 * including MSi-X interrupts, if any. */
194 ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
195 /* Flush pending VQ/configuration callbacks. */
196 vp_synchronize_vectors(vdev);
199 /* the notify function used when creating a virt queue */
200 static bool vp_notify(struct virtqueue *vq)
202 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
204 /* we write the queue's selector into the notification register to
205 * signal the other end */
206 iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
210 /* Handle a configuration change: Tell driver if it wants to know. */
211 static irqreturn_t vp_config_changed(int irq, void *opaque)
213 struct virtio_pci_device *vp_dev = opaque;
214 struct virtio_driver *drv;
215 drv = container_of(vp_dev->vdev.dev.driver,
216 struct virtio_driver, driver);
218 if (drv && drv->config_changed)
219 drv->config_changed(&vp_dev->vdev);
223 /* Notify all virtqueues on an interrupt. */
224 static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
226 struct virtio_pci_device *vp_dev = opaque;
227 struct virtio_pci_vq_info *info;
228 irqreturn_t ret = IRQ_NONE;
231 spin_lock_irqsave(&vp_dev->lock, flags);
232 list_for_each_entry(info, &vp_dev->virtqueues, node) {
233 if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
236 spin_unlock_irqrestore(&vp_dev->lock, flags);
241 /* A small wrapper to also acknowledge the interrupt when it's handled.
242 * I really need an EIO hook for the vring so I can ack the interrupt once we
243 * know that we'll be handling the IRQ but before we invoke the callback since
244 * the callback may notify the host which results in the host attempting to
245 * raise an interrupt that we would then mask once we acknowledged the
247 static irqreturn_t vp_interrupt(int irq, void *opaque)
249 struct virtio_pci_device *vp_dev = opaque;
252 /* reading the ISR has the effect of also clearing it so it's very
253 * important to save off the value. */
254 isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
256 /* It's definitely not us if the ISR was not high */
260 /* Configuration change? Tell driver if it wants to know. */
261 if (isr & VIRTIO_PCI_ISR_CONFIG)
262 vp_config_changed(irq, opaque);
264 return vp_vring_interrupt(irq, opaque);
267 static void vp_free_vectors(struct virtio_device *vdev)
269 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
272 if (vp_dev->intx_enabled) {
273 free_irq(vp_dev->pci_dev->irq, vp_dev);
274 vp_dev->intx_enabled = 0;
277 for (i = 0; i < vp_dev->msix_used_vectors; ++i)
278 free_irq(vp_dev->msix_entries[i].vector, vp_dev);
280 for (i = 0; i < vp_dev->msix_vectors; i++)
281 if (vp_dev->msix_affinity_masks[i])
282 free_cpumask_var(vp_dev->msix_affinity_masks[i]);
284 if (vp_dev->msix_enabled) {
285 /* Disable the vector used for configuration */
286 iowrite16(VIRTIO_MSI_NO_VECTOR,
287 vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
288 /* Flush the write out to device */
289 ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
291 pci_disable_msix(vp_dev->pci_dev);
292 vp_dev->msix_enabled = 0;
295 vp_dev->msix_vectors = 0;
296 vp_dev->msix_used_vectors = 0;
297 kfree(vp_dev->msix_names);
298 vp_dev->msix_names = NULL;
299 kfree(vp_dev->msix_entries);
300 vp_dev->msix_entries = NULL;
301 kfree(vp_dev->msix_affinity_masks);
302 vp_dev->msix_affinity_masks = NULL;
305 static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
308 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
309 const char *name = dev_name(&vp_dev->vdev.dev);
313 vp_dev->msix_vectors = nvectors;
315 vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
317 if (!vp_dev->msix_entries)
319 vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
321 if (!vp_dev->msix_names)
323 vp_dev->msix_affinity_masks
324 = kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
326 if (!vp_dev->msix_affinity_masks)
328 for (i = 0; i < nvectors; ++i)
329 if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
333 for (i = 0; i < nvectors; ++i)
334 vp_dev->msix_entries[i].entry = i;
336 /* pci_enable_msix returns positive if we can't get this many. */
337 err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
342 vp_dev->msix_enabled = 1;
344 /* Set the vector used for configuration */
345 v = vp_dev->msix_used_vectors;
346 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
348 err = request_irq(vp_dev->msix_entries[v].vector,
349 vp_config_changed, 0, vp_dev->msix_names[v],
353 ++vp_dev->msix_used_vectors;
355 iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
356 /* Verify we had enough resources to assign the vector */
357 v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
358 if (v == VIRTIO_MSI_NO_VECTOR) {
363 if (!per_vq_vectors) {
364 /* Shared vector for all VQs */
365 v = vp_dev->msix_used_vectors;
366 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
367 "%s-virtqueues", name);
368 err = request_irq(vp_dev->msix_entries[v].vector,
369 vp_vring_interrupt, 0, vp_dev->msix_names[v],
373 ++vp_dev->msix_used_vectors;
377 vp_free_vectors(vdev);
381 static int vp_request_intx(struct virtio_device *vdev)
384 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
386 err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
387 IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
389 vp_dev->intx_enabled = 1;
393 static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
394 void (*callback)(struct virtqueue *vq),
398 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
399 struct virtio_pci_vq_info *info;
400 struct virtqueue *vq;
401 unsigned long flags, size;
405 /* Select the queue we're interested in */
406 iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
408 /* Check if queue is either not available or already active. */
409 num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
410 if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
411 return ERR_PTR(-ENOENT);
413 /* allocate and fill out our structure the represents an active
415 info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL);
417 return ERR_PTR(-ENOMEM);
420 info->msix_vector = msix_vec;
422 size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
423 info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
424 if (info->queue == NULL) {
429 /* activate the queue */
430 iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
431 vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
433 /* create the vring */
434 vq = vring_new_virtqueue(index, info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
435 true, info->queue, vp_notify, callback, name);
438 goto out_activate_queue;
444 if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
445 iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
446 msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
447 if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
454 spin_lock_irqsave(&vp_dev->lock, flags);
455 list_add(&info->node, &vp_dev->virtqueues);
456 spin_unlock_irqrestore(&vp_dev->lock, flags);
458 INIT_LIST_HEAD(&info->node);
464 vring_del_virtqueue(vq);
466 iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
467 free_pages_exact(info->queue, size);
473 static void vp_del_vq(struct virtqueue *vq)
475 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
476 struct virtio_pci_vq_info *info = vq->priv;
477 unsigned long flags, size;
479 spin_lock_irqsave(&vp_dev->lock, flags);
480 list_del(&info->node);
481 spin_unlock_irqrestore(&vp_dev->lock, flags);
483 iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
485 if (vp_dev->msix_enabled) {
486 iowrite16(VIRTIO_MSI_NO_VECTOR,
487 vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
488 /* Flush the write out to device */
489 ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
492 vring_del_virtqueue(vq);
494 /* Select and deactivate the queue */
495 iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
497 size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
498 free_pages_exact(info->queue, size);
502 /* the config->del_vqs() implementation */
503 static void vp_del_vqs(struct virtio_device *vdev)
505 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
506 struct virtqueue *vq, *n;
507 struct virtio_pci_vq_info *info;
509 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
511 if (vp_dev->per_vq_vectors &&
512 info->msix_vector != VIRTIO_MSI_NO_VECTOR)
513 free_irq(vp_dev->msix_entries[info->msix_vector].vector,
517 vp_dev->per_vq_vectors = false;
519 vp_free_vectors(vdev);
522 static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
523 struct virtqueue *vqs[],
524 vq_callback_t *callbacks[],
529 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
531 int i, err, nvectors, allocated_vectors;
534 /* Old style: one normal interrupt for change and all vqs. */
535 err = vp_request_intx(vdev);
539 if (per_vq_vectors) {
540 /* Best option: one for change interrupt, one per vq. */
542 for (i = 0; i < nvqs; ++i)
546 /* Second best: one for change, shared for all vqs. */
550 err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
555 vp_dev->per_vq_vectors = per_vq_vectors;
556 allocated_vectors = vp_dev->msix_used_vectors;
557 for (i = 0; i < nvqs; ++i) {
561 } else if (!callbacks[i] || !vp_dev->msix_enabled)
562 msix_vec = VIRTIO_MSI_NO_VECTOR;
563 else if (vp_dev->per_vq_vectors)
564 msix_vec = allocated_vectors++;
566 msix_vec = VP_MSIX_VQ_VECTOR;
567 vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
568 if (IS_ERR(vqs[i])) {
569 err = PTR_ERR(vqs[i]);
573 if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
576 /* allocate per-vq irq if available and necessary */
577 snprintf(vp_dev->msix_names[msix_vec],
578 sizeof *vp_dev->msix_names,
580 dev_name(&vp_dev->vdev.dev), names[i]);
581 err = request_irq(vp_dev->msix_entries[msix_vec].vector,
583 vp_dev->msix_names[msix_vec],
599 /* the config->find_vqs() implementation */
600 static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
601 struct virtqueue *vqs[],
602 vq_callback_t *callbacks[],
607 /* Try MSI-X with one vector per queue. */
608 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
611 /* Fallback: MSI-X with one vector for config, one shared for queues. */
612 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
616 /* Finally fall back to regular interrupts. */
617 return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
621 static const char *vp_bus_name(struct virtio_device *vdev)
623 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
625 return pci_name(vp_dev->pci_dev);
628 /* Setup the affinity for a virtqueue:
629 * - force the affinity for per vq vector
630 * - OR over all affinities for shared MSI
631 * - ignore the affinity request if we're using INTX
633 static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
635 struct virtio_device *vdev = vq->vdev;
636 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
637 struct virtio_pci_vq_info *info = vq->priv;
638 struct cpumask *mask;
644 if (vp_dev->msix_enabled) {
645 mask = vp_dev->msix_affinity_masks[info->msix_vector];
646 irq = vp_dev->msix_entries[info->msix_vector].vector;
648 irq_set_affinity_hint(irq, NULL);
650 cpumask_set_cpu(cpu, mask);
651 irq_set_affinity_hint(irq, mask);
657 static const struct virtio_config_ops virtio_pci_config_ops = {
660 .get_status = vp_get_status,
661 .set_status = vp_set_status,
663 .find_vqs = vp_find_vqs,
664 .del_vqs = vp_del_vqs,
665 .get_features = vp_get_features,
666 .finalize_features = vp_finalize_features,
667 .bus_name = vp_bus_name,
668 .set_vq_affinity = vp_set_vq_affinity,
671 static void virtio_pci_release_dev(struct device *_d)
674 * No need for a release method as we allocate/free
675 * all devices together with the pci devices.
676 * Provide an empty one to avoid getting a warning from core.
680 /* the PCI probing function */
681 static int virtio_pci_probe(struct pci_dev *pci_dev,
682 const struct pci_device_id *id)
684 struct virtio_pci_device *vp_dev;
687 /* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
688 if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
691 if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
692 printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
693 VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
697 /* allocate our structure and fill it out */
698 vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
702 vp_dev->vdev.dev.parent = &pci_dev->dev;
703 vp_dev->vdev.dev.release = virtio_pci_release_dev;
704 vp_dev->vdev.config = &virtio_pci_config_ops;
705 vp_dev->pci_dev = pci_dev;
706 INIT_LIST_HEAD(&vp_dev->virtqueues);
707 spin_lock_init(&vp_dev->lock);
709 /* Disable MSI/MSIX to bring device to a known good state. */
710 pci_msi_off(pci_dev);
712 /* enable the device */
713 err = pci_enable_device(pci_dev);
717 err = pci_request_regions(pci_dev, "virtio-pci");
719 goto out_enable_device;
721 vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
722 if (vp_dev->ioaddr == NULL) {
724 goto out_req_regions;
727 pci_set_drvdata(pci_dev, vp_dev);
728 pci_set_master(pci_dev);
730 /* we use the subsystem vendor/device id as the virtio vendor/device
731 * id. this allows us to use the same PCI vendor/device id for all
732 * virtio devices and to identify the particular virtio driver by
733 * the subsystem ids */
734 vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
735 vp_dev->vdev.id.device = pci_dev->subsystem_device;
737 /* finally register the virtio device */
738 err = register_virtio_device(&vp_dev->vdev);
740 goto out_set_drvdata;
745 pci_iounmap(pci_dev, vp_dev->ioaddr);
747 pci_release_regions(pci_dev);
749 pci_disable_device(pci_dev);
755 static void virtio_pci_remove(struct pci_dev *pci_dev)
757 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
759 unregister_virtio_device(&vp_dev->vdev);
761 vp_del_vqs(&vp_dev->vdev);
762 pci_iounmap(pci_dev, vp_dev->ioaddr);
763 pci_release_regions(pci_dev);
764 pci_disable_device(pci_dev);
768 #ifdef CONFIG_PM_SLEEP
769 static int virtio_pci_freeze(struct device *dev)
771 struct pci_dev *pci_dev = to_pci_dev(dev);
772 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
773 struct virtio_driver *drv;
776 drv = container_of(vp_dev->vdev.dev.driver,
777 struct virtio_driver, driver);
780 vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
781 if (drv && drv->freeze)
782 ret = drv->freeze(&vp_dev->vdev);
785 pci_disable_device(pci_dev);
789 static int virtio_pci_restore(struct device *dev)
791 struct pci_dev *pci_dev = to_pci_dev(dev);
792 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
793 struct virtio_driver *drv;
796 drv = container_of(vp_dev->vdev.dev.driver,
797 struct virtio_driver, driver);
799 ret = pci_enable_device(pci_dev);
803 pci_set_master(pci_dev);
804 vp_finalize_features(&vp_dev->vdev);
806 if (drv && drv->restore)
807 ret = drv->restore(&vp_dev->vdev);
809 /* Finally, tell the device we're all set */
811 vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
816 static const struct dev_pm_ops virtio_pci_pm_ops = {
817 SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
821 static struct pci_driver virtio_pci_driver = {
822 .name = "virtio-pci",
823 .id_table = virtio_pci_id_table,
824 .probe = virtio_pci_probe,
825 .remove = virtio_pci_remove,
826 #ifdef CONFIG_PM_SLEEP
827 .driver.pm = &virtio_pci_pm_ops,
831 module_pci_driver(virtio_pci_driver);