Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/virtio/virtio_mmio.c

  1 /*
  2  * Virtio memory mapped device driver
  3  *
  4  * Copyright 2011, ARM Ltd.
  5  *
  6  * This module allows virtio devices to be used over a virtual, memory mapped
  7  * platform device.
  8  *
  9  * The guest device(s) may be instantiated in one of three equivalent ways:
 10  *
 11  * 1. Static platform device in board's code, eg.:
 12  *
 13  *      static struct platform_device v2m_virtio_device = {
 14  *              .name = "virtio-mmio",
 15  *              .id = -1,
 16  *              .num_resources = 2,
 17  *              .resource = (struct resource []) {
 18  *                      {
 19  *                              .start = 0x1001e000,
 20  *                              .end = 0x1001e0ff,
 21  *                              .flags = IORESOURCE_MEM,
 22  *                      }, {
 23  *                              .start = 42 + 32,
 24  *                              .end = 42 + 32,
 25  *                              .flags = IORESOURCE_IRQ,
 26  *                      },
 27  *              }
 28  *      };
 29  *
 30  * 2. Device Tree node, eg.:
 31  *
 32  *              virtio_block@1e000 {
 33  *                      compatible = "virtio,mmio";
 34  *                      reg = <0x1e000 0x100>;
 35  *                      interrupts = <42>;
 36  *              }
 37  *
 38  * 3. Kernel module (or command line) parameter. Can be used more than once -
 39  *    one device will be created for each one. Syntax:
 40  *
 41  *              [virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>]
 42  *    where:
 43  *              <size>     := size (can use standard suffixes like K, M or G)
 44  *              <baseaddr> := physical base address
 45  *              <irq>      := interrupt number (as passed to request_irq())
 46  *              <id>       := (optional) platform device id
 47  *    eg.:
 48  *              virtio_mmio.device=0x100@0x100b0000:48 \
 49  *                              virtio_mmio.device=1K@0x1001e000:74
 50  *
 51  *
 52  *
 53  * Registers layout (all 32-bit wide):
 54  *
 55  * offset d. name             description
 56  * ------ -- ---------------- -----------------
 57  *
 58  * 0x000  R  MagicValue       Magic value "virt"
 59  * 0x004  R  Version          Device version (current max. 1)
 60  * 0x008  R  DeviceID         Virtio device ID
 61  * 0x00c  R  VendorID         Virtio vendor ID
 62  *
 63  * 0x010  R  HostFeatures     Features supported by the host
 64  * 0x014  W  HostFeaturesSel  Set of host features to access via HostFeatures
 65  *
 66  * 0x020  W  GuestFeatures    Features activated by the guest
 67  * 0x024  W  GuestFeaturesSel Set of activated features to set via GuestFeatures
 68  * 0x028  W  GuestPageSize    Size of guest's memory page in bytes
 69  *
 70  * 0x030  W  QueueSel         Queue selector
 71  * 0x034  R  QueueNumMax      Maximum size of the currently selected queue
 72  * 0x038  W  QueueNum         Queue size for the currently selected queue
 73  * 0x03c  W  QueueAlign       Used Ring alignment for the current queue
 74  * 0x040  RW QueuePFN         PFN for the currently selected queue
 75  *
 76  * 0x050  W  QueueNotify      Queue notifier
 77  * 0x060  R  InterruptStatus  Interrupt status register
 78  * 0x064  W  InterruptACK     Interrupt acknowledge register
 79  * 0x070  RW Status           Device status register
 80  *
 81  * 0x100+ RW                  Device-specific configuration space
 82  *
 83  * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
 84  *
 85  * This work is licensed under the terms of the GNU GPL, version 2 or later.
 86  * See the COPYING file in the top-level directory.
 87  */
 88 
 89 #define pr_fmt(fmt) "virtio-mmio: " fmt
 90 
 91 #include <linux/highmem.h>
 92 #include <linux/interrupt.h>
 93 #include <linux/io.h>
 94 #include <linux/list.h>
 95 #include <linux/module.h>
 96 #include <linux/platform_device.h>
 97 #include <linux/slab.h>
 98 #include <linux/spinlock.h>
 99 #include <linux/virtio.h>
100 #include <linux/virtio_config.h>
101 #include <linux/virtio_mmio.h>
102 #include <linux/virtio_ring.h>
103 
104 
105 
106 /* The alignment to use between consumer and producer parts of vring.
107  * Currently hardcoded to the page size. */
108 #define VIRTIO_MMIO_VRING_ALIGN         PAGE_SIZE
109 
110 
111 
112 #define to_virtio_mmio_device(_plat_dev) \
113         container_of(_plat_dev, struct virtio_mmio_device, vdev)
114 
115 struct virtio_mmio_device {
116         struct virtio_device vdev;
117         struct platform_device *pdev;
118 
119         void __iomem *base;
120         unsigned long version;
121 
122         /* a list of queues so we can dispatch IRQs */
123         spinlock_t lock;
124         struct list_head virtqueues;
125 };
126 
127 struct virtio_mmio_vq_info {
128         /* the actual virtqueue */
129         struct virtqueue *vq;
130 
131         /* the number of entries in the queue */
132         unsigned int num;
133 
134         /* the virtual address of the ring queue */
135         void *queue;
136 
137         /* the list node for the virtqueues list */
138         struct list_head node;
139 };
140 
141 
142 
143 /* Configuration interface */
144 
145 static u32 vm_get_features(struct virtio_device *vdev)
146 {
147         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
148 
149         /* TODO: Features > 32 bits */
150         writel(0, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL);
151 
152         return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
153 }
154 
155 static void vm_finalize_features(struct virtio_device *vdev)
156 {
157         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
158         int i;
159 
160         /* Give virtio_ring a chance to accept features. */
161         vring_transport_features(vdev);
162 
163         for (i = 0; i < ARRAY_SIZE(vdev->features); i++) {
164                 writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
165                 writel(vdev->features[i],
166                                 vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
167         }
168 }
169 
170 static void vm_get(struct virtio_device *vdev, unsigned offset,
171                    void *buf, unsigned len)
172 {
173         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
174         u8 *ptr = buf;
175         int i;
176 
177         for (i = 0; i < len; i++)
178                 ptr[i] = readb(vm_dev->base + VIRTIO_MMIO_CONFIG + offset + i);
179 }
180 
181 static void vm_set(struct virtio_device *vdev, unsigned offset,
182                    const void *buf, unsigned len)
183 {
184         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
185         const u8 *ptr = buf;
186         int i;
187 
188         for (i = 0; i < len; i++)
189                 writeb(ptr[i], vm_dev->base + VIRTIO_MMIO_CONFIG + offset + i);
190 }
191 
192 static u8 vm_get_status(struct virtio_device *vdev)
193 {
194         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
195 
196         return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff;
197 }
198 
199 static void vm_set_status(struct virtio_device *vdev, u8 status)
200 {
201         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
202 
203         /* We should never be setting status to 0. */
204         BUG_ON(status == 0);
205 
206         writel(status, vm_dev->base + VIRTIO_MMIO_STATUS);
207 }
208 
209 static void vm_reset(struct virtio_device *vdev)
210 {
211         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
212 
213         /* 0 status means a reset. */
214         writel(0, vm_dev->base + VIRTIO_MMIO_STATUS);
215 }
216 
217 
218 
219 /* Transport interface */
220 
221 /* the notify function used when creating a virt queue */
222 static bool vm_notify(struct virtqueue *vq)
223 {
224         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
225 
226         /* We write the queue's selector into the notification register to
227          * signal the other end */
228         writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
229         return true;
230 }
231 
232 /* Notify all virtqueues on an interrupt. */
233 static irqreturn_t vm_interrupt(int irq, void *opaque)
234 {
235         struct virtio_mmio_device *vm_dev = opaque;
236         struct virtio_mmio_vq_info *info;
237         struct virtio_driver *vdrv = container_of(vm_dev->vdev.dev.driver,
238                         struct virtio_driver, driver);
239         unsigned long status;
240         unsigned long flags;
241         irqreturn_t ret = IRQ_NONE;
242 
243         /* Read and acknowledge interrupts */
244         status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS);
245         writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK);
246 
247         if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)
248                         && vdrv && vdrv->config_changed) {
249                 vdrv->config_changed(&vm_dev->vdev);
250                 ret = IRQ_HANDLED;
251         }
252 
253         if (likely(status & VIRTIO_MMIO_INT_VRING)) {
254                 spin_lock_irqsave(&vm_dev->lock, flags);
255                 list_for_each_entry(info, &vm_dev->virtqueues, node)
256                         ret |= vring_interrupt(irq, info->vq);
257                 spin_unlock_irqrestore(&vm_dev->lock, flags);
258         }
259 
260         return ret;
261 }
262 
263 
264 
265 static void vm_del_vq(struct virtqueue *vq)
266 {
267         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
268         struct virtio_mmio_vq_info *info = vq->priv;
269         unsigned long flags, size;
270         unsigned int index = vq->index;
271 
272         spin_lock_irqsave(&vm_dev->lock, flags);
273         list_del(&info->node);
274         spin_unlock_irqrestore(&vm_dev->lock, flags);
275 
276         vring_del_virtqueue(vq);
277 
278         /* Select and deactivate the queue */
279         writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
280         writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
281 
282         size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN));
283         free_pages_exact(info->queue, size);
284         kfree(info);
285 }
286 
287 static void vm_del_vqs(struct virtio_device *vdev)
288 {
289         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
290         struct virtqueue *vq, *n;
291 
292         list_for_each_entry_safe(vq, n, &vdev->vqs, list)
293                 vm_del_vq(vq);
294 
295         free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev);
296 }
297 
298 
299 
300 static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
301                                   void (*callback)(struct virtqueue *vq),
302                                   const char *name)
303 {
304         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
305         struct virtio_mmio_vq_info *info;
306         struct virtqueue *vq;
307         unsigned long flags, size;
308         int err;
309 
310         if (!name)
311                 return NULL;
312 
313         /* Select the queue we're interested in */
314         writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
315 
316         /* Queue shouldn't already be set up. */
317         if (readl(vm_dev->base + VIRTIO_MMIO_QUEUE_PFN)) {
318                 err = -ENOENT;
319                 goto error_available;
320         }
321 
322         /* Allocate and fill out our active queue description */
323         info = kmalloc(sizeof(*info), GFP_KERNEL);
324         if (!info) {
325                 err = -ENOMEM;
326                 goto error_kmalloc;
327         }
328 
329         /* Allocate pages for the queue - start with a queue as big as
330          * possible (limited by maximum size allowed by device), drop down
331          * to a minimal size, just big enough to fit descriptor table
332          * and two rings (which makes it "alignment_size * 2")
333          */
334         info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX);
335 
336         /* If the device reports a 0 entry queue, we won't be able to
337          * use it to perform I/O, and vring_new_virtqueue() can't create
338          * empty queues anyway, so don't bother to set up the device.
339          */
340         if (info->num == 0) {
341                 err = -ENOENT;
342                 goto error_alloc_pages;
343         }
344 
345         while (1) {
346                 size = PAGE_ALIGN(vring_size(info->num,
347                                 VIRTIO_MMIO_VRING_ALIGN));
348                 /* Did the last iter shrink the queue below minimum size? */
349                 if (size < VIRTIO_MMIO_VRING_ALIGN * 2) {
350                         err = -ENOMEM;
351                         goto error_alloc_pages;
352                 }
353 
354                 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
355                 if (info->queue)
356                         break;
357 
358                 info->num /= 2;
359         }
360 
361         /* Activate the queue */
362         writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM);
363         writel(VIRTIO_MMIO_VRING_ALIGN,
364                         vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN);
365         writel(virt_to_phys(info->queue) >> PAGE_SHIFT,
366                         vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
367 
368         /* Create the vring */
369         vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev,
370                                  true, info->queue, vm_notify, callback, name);
371         if (!vq) {
372                 err = -ENOMEM;
373                 goto error_new_virtqueue;
374         }
375 
376         vq->priv = info;
377         info->vq = vq;
378 
379         spin_lock_irqsave(&vm_dev->lock, flags);
380         list_add(&info->node, &vm_dev->virtqueues);
381         spin_unlock_irqrestore(&vm_dev->lock, flags);
382 
383         return vq;
384 
385 error_new_virtqueue:
386         writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
387         free_pages_exact(info->queue, size);
388 error_alloc_pages:
389         kfree(info);
390 error_kmalloc:
391 error_available:
392         return ERR_PTR(err);
393 }
394 
395 static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
396                        struct virtqueue *vqs[],
397                        vq_callback_t *callbacks[],
398                        const char *names[])
399 {
400         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
401         unsigned int irq = platform_get_irq(vm_dev->pdev, 0);
402         int i, err;
403 
404         err = request_irq(irq, vm_interrupt, IRQF_SHARED,
405                         dev_name(&vdev->dev), vm_dev);
406         if (err)
407                 return err;
408 
409         for (i = 0; i < nvqs; ++i) {
410                 vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]);
411                 if (IS_ERR(vqs[i])) {
412                         vm_del_vqs(vdev);
413                         return PTR_ERR(vqs[i]);
414                 }
415         }
416 
417         return 0;
418 }
419 
420 static const char *vm_bus_name(struct virtio_device *vdev)
421 {
422         struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
423 
424         return vm_dev->pdev->name;
425 }
426 
427 static const struct virtio_config_ops virtio_mmio_config_ops = {
428         .get            = vm_get,
429         .set            = vm_set,
430         .get_status     = vm_get_status,
431         .set_status     = vm_set_status,
432         .reset          = vm_reset,
433         .find_vqs       = vm_find_vqs,
434         .del_vqs        = vm_del_vqs,
435         .get_features   = vm_get_features,
436         .finalize_features = vm_finalize_features,
437         .bus_name       = vm_bus_name,
438 };
439 
440 
441 
442 /* Platform device */
443 
444 static int virtio_mmio_probe(struct platform_device *pdev)
445 {
446         struct virtio_mmio_device *vm_dev;
447         struct resource *mem;
448         unsigned long magic;
449 
450         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
451         if (!mem)
452                 return -EINVAL;
453 
454         if (!devm_request_mem_region(&pdev->dev, mem->start,
455                         resource_size(mem), pdev->name))
456                 return -EBUSY;
457 
458         vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL);
459         if (!vm_dev)
460                 return  -ENOMEM;
461 
462         vm_dev->vdev.dev.parent = &pdev->dev;
463         vm_dev->vdev.config = &virtio_mmio_config_ops;
464         vm_dev->pdev = pdev;
465         INIT_LIST_HEAD(&vm_dev->virtqueues);
466         spin_lock_init(&vm_dev->lock);
467 
468         vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
469         if (vm_dev->base == NULL)
470                 return -EFAULT;
471 
472         /* Check magic value */
473         magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE);
474         if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
475                 dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic);
476                 return -ENODEV;
477         }
478 
479         /* Check device version */
480         vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION);
481         if (vm_dev->version != 1) {
482                 dev_err(&pdev->dev, "Version %ld not supported!\n",
483                                 vm_dev->version);
484                 return -ENXIO;
485         }
486 
487         vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID);
488         vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID);
489 
490         writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE);
491 
492         platform_set_drvdata(pdev, vm_dev);
493 
494         return register_virtio_device(&vm_dev->vdev);
495 }
496 
497 static int virtio_mmio_remove(struct platform_device *pdev)
498 {
499         struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
500 
501         unregister_virtio_device(&vm_dev->vdev);
502 
503         return 0;
504 }
505 
506 
507 
508 /* Devices list parameter */
509 
510 #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES)
511 
512 static struct device vm_cmdline_parent = {
513         .init_name = "virtio-mmio-cmdline",
514 };
515 
516 static int vm_cmdline_parent_registered;
517 static int vm_cmdline_id;
518 
519 static int vm_cmdline_set(const char *device,
520                 const struct kernel_param *kp)
521 {
522         int err;
523         struct resource resources[2] = {};
524         char *str;
525         long long int base, size;
526         unsigned int irq;
527         int processed, consumed = 0;
528         struct platform_device *pdev;
529 
530         /* Consume "size" part of the command line parameter */
531         size = memparse(device, &str);
532 
533         /* Get "@<base>:<irq>[:<id>]" chunks */
534         processed = sscanf(str, "@%lli:%u%n:%d%n",
535                         &base, &irq, &consumed,
536                         &vm_cmdline_id, &consumed);
537 
538         /*
539          * sscanf() must processes at least 2 chunks; also there
540          * must be no extra characters after the last chunk, so
541          * str[consumed] must be '\0'
542          */
543         if (processed < 2 || str[consumed])
544                 return -EINVAL;
545 
546         resources[0].flags = IORESOURCE_MEM;
547         resources[0].start = base;
548         resources[0].end = base + size - 1;
549 
550         resources[1].flags = IORESOURCE_IRQ;
551         resources[1].start = resources[1].end = irq;
552 
553         if (!vm_cmdline_parent_registered) {
554                 err = device_register(&vm_cmdline_parent);
555                 if (err) {
556                         pr_err("Failed to register parent device!\n");
557                         return err;
558                 }
559                 vm_cmdline_parent_registered = 1;
560         }
561 
562         pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n",
563                        vm_cmdline_id,
564                        (unsigned long long)resources[0].start,
565                        (unsigned long long)resources[0].end,
566                        (int)resources[1].start);
567 
568         pdev = platform_device_register_resndata(&vm_cmdline_parent,
569                         "virtio-mmio", vm_cmdline_id++,
570                         resources, ARRAY_SIZE(resources), NULL, 0);
571         if (IS_ERR(pdev))
572                 return PTR_ERR(pdev);
573 
574         return 0;
575 }
576 
577 static int vm_cmdline_get_device(struct device *dev, void *data)
578 {
579         char *buffer = data;
580         unsigned int len = strlen(buffer);
581         struct platform_device *pdev = to_platform_device(dev);
582 
583         snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n",
584                         pdev->resource[0].end - pdev->resource[0].start + 1ULL,
585                         (unsigned long long)pdev->resource[0].start,
586                         (unsigned long long)pdev->resource[1].start,
587                         pdev->id);
588         return 0;
589 }
590 
591 static int vm_cmdline_get(char *buffer, const struct kernel_param *kp)
592 {
593         buffer[0] = '\0';
594         device_for_each_child(&vm_cmdline_parent, buffer,
595                         vm_cmdline_get_device);
596         return strlen(buffer) + 1;
597 }
598 
599 static struct kernel_param_ops vm_cmdline_param_ops = {
600         .set = vm_cmdline_set,
601         .get = vm_cmdline_get,
602 };
603 
604 device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR);
605 
606 static int vm_unregister_cmdline_device(struct device *dev,
607                 void *data)
608 {
609         platform_device_unregister(to_platform_device(dev));
610 
611         return 0;
612 }
613 
614 static void vm_unregister_cmdline_devices(void)
615 {
616         if (vm_cmdline_parent_registered) {
617                 device_for_each_child(&vm_cmdline_parent, NULL,
618                                 vm_unregister_cmdline_device);
619                 device_unregister(&vm_cmdline_parent);
620                 vm_cmdline_parent_registered = 0;
621         }
622 }
623 
624 #else
625 
626 static void vm_unregister_cmdline_devices(void)
627 {
628 }
629 
630 #endif
631 
632 /* Platform driver */
633 
634 static struct of_device_id virtio_mmio_match[] = {
635         { .compatible = "virtio,mmio", },
636         {},
637 };
638 MODULE_DEVICE_TABLE(of, virtio_mmio_match);
639 
640 static struct platform_driver virtio_mmio_driver = {
641         .probe          = virtio_mmio_probe,
642         .remove         = virtio_mmio_remove,
643         .driver         = {
644                 .name   = "virtio-mmio",
645                 .owner  = THIS_MODULE,
646                 .of_match_table = virtio_mmio_match,
647         },
648 };
649 
650 static int __init virtio_mmio_init(void)
651 {
652         return platform_driver_register(&virtio_mmio_driver);
653 }
654 
655 static void __exit virtio_mmio_exit(void)
656 {
657         platform_driver_unregister(&virtio_mmio_driver);
658         vm_unregister_cmdline_devices();
659 }
660 
661 module_init(virtio_mmio_init);
662 module_exit(virtio_mmio_exit);
663 
664 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
665 MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices");
666 MODULE_LICENSE("GPL");
667 

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