1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
6 * Author: Alex Williamson <alex.williamson@redhat.com>
8 * Derived from original vfio:
9 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
10 * Author: Tom Lyon, pugs@cisco.com
13 #include <linux/cdev.h>
14 #include <linux/compat.h>
15 #include <linux/device.h>
16 #include <linux/file.h>
17 #include <linux/anon_inodes.h>
19 #include <linux/idr.h>
20 #include <linux/iommu.h>
21 #include <linux/list.h>
22 #include <linux/miscdevice.h>
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <linux/pci.h>
26 #include <linux/rwsem.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/stat.h>
30 #include <linux/string.h>
31 #include <linux/uaccess.h>
32 #include <linux/vfio.h>
33 #include <linux/wait.h>
34 #include <linux/sched/signal.h>
35 #include <linux/pm_runtime.h>
36 #include <linux/interval_tree.h>
37 #include <linux/iova_bitmap.h>
40 #define DRIVER_VERSION "0.3"
41 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
42 #define DRIVER_DESC "VFIO - User Level meta-driver"
46 struct list_head group_list;
47 struct mutex group_lock; /* locks group_list */
50 struct class *device_class;
51 struct ida device_ida;
54 static DEFINE_XARRAY(vfio_device_set_xa);
55 static const struct file_operations vfio_group_fops;
57 int vfio_assign_device_set(struct vfio_device *device, void *set_id)
59 unsigned long idx = (unsigned long)set_id;
60 struct vfio_device_set *new_dev_set;
61 struct vfio_device_set *dev_set;
67 * Atomically acquire a singleton object in the xarray for this set_id
69 xa_lock(&vfio_device_set_xa);
70 dev_set = xa_load(&vfio_device_set_xa, idx);
73 xa_unlock(&vfio_device_set_xa);
75 new_dev_set = kzalloc(sizeof(*new_dev_set), GFP_KERNEL);
78 mutex_init(&new_dev_set->lock);
79 INIT_LIST_HEAD(&new_dev_set->device_list);
80 new_dev_set->set_id = set_id;
82 xa_lock(&vfio_device_set_xa);
83 dev_set = __xa_cmpxchg(&vfio_device_set_xa, idx, NULL, new_dev_set,
86 dev_set = new_dev_set;
91 if (xa_is_err(dev_set)) {
92 xa_unlock(&vfio_device_set_xa);
93 return xa_err(dev_set);
97 dev_set->device_count++;
98 xa_unlock(&vfio_device_set_xa);
99 mutex_lock(&dev_set->lock);
100 device->dev_set = dev_set;
101 list_add_tail(&device->dev_set_list, &dev_set->device_list);
102 mutex_unlock(&dev_set->lock);
105 EXPORT_SYMBOL_GPL(vfio_assign_device_set);
107 static void vfio_release_device_set(struct vfio_device *device)
109 struct vfio_device_set *dev_set = device->dev_set;
114 mutex_lock(&dev_set->lock);
115 list_del(&device->dev_set_list);
116 mutex_unlock(&dev_set->lock);
118 xa_lock(&vfio_device_set_xa);
119 if (!--dev_set->device_count) {
120 __xa_erase(&vfio_device_set_xa,
121 (unsigned long)dev_set->set_id);
122 mutex_destroy(&dev_set->lock);
125 xa_unlock(&vfio_device_set_xa);
128 unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set)
130 struct vfio_device *cur;
131 unsigned int open_count = 0;
133 lockdep_assert_held(&dev_set->lock);
135 list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
136 open_count += cur->open_count;
139 EXPORT_SYMBOL_GPL(vfio_device_set_open_count);
142 * Group objects - create, release, get, put, search
144 static struct vfio_group *
145 __vfio_group_get_from_iommu(struct iommu_group *iommu_group)
147 struct vfio_group *group;
150 * group->iommu_group from the vfio.group_list cannot be NULL
151 * under the vfio.group_lock.
153 list_for_each_entry(group, &vfio.group_list, vfio_next) {
154 if (group->iommu_group == iommu_group) {
155 refcount_inc(&group->drivers);
162 static struct vfio_group *
163 vfio_group_get_from_iommu(struct iommu_group *iommu_group)
165 struct vfio_group *group;
167 mutex_lock(&vfio.group_lock);
168 group = __vfio_group_get_from_iommu(iommu_group);
169 mutex_unlock(&vfio.group_lock);
173 static void vfio_group_release(struct device *dev)
175 struct vfio_group *group = container_of(dev, struct vfio_group, dev);
177 mutex_destroy(&group->device_lock);
178 mutex_destroy(&group->group_lock);
179 WARN_ON(group->iommu_group);
180 ida_free(&vfio.group_ida, MINOR(group->dev.devt));
184 static struct vfio_group *vfio_group_alloc(struct iommu_group *iommu_group,
185 enum vfio_group_type type)
187 struct vfio_group *group;
190 group = kzalloc(sizeof(*group), GFP_KERNEL);
192 return ERR_PTR(-ENOMEM);
194 minor = ida_alloc_max(&vfio.group_ida, MINORMASK, GFP_KERNEL);
197 return ERR_PTR(minor);
200 device_initialize(&group->dev);
201 group->dev.devt = MKDEV(MAJOR(vfio.group_devt), minor);
202 group->dev.class = vfio.class;
203 group->dev.release = vfio_group_release;
204 cdev_init(&group->cdev, &vfio_group_fops);
205 group->cdev.owner = THIS_MODULE;
207 refcount_set(&group->drivers, 1);
208 mutex_init(&group->group_lock);
209 INIT_LIST_HEAD(&group->device_list);
210 mutex_init(&group->device_lock);
211 group->iommu_group = iommu_group;
212 /* put in vfio_group_release() */
213 iommu_group_ref_get(iommu_group);
215 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
220 static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
221 enum vfio_group_type type)
223 struct vfio_group *group;
224 struct vfio_group *ret;
227 group = vfio_group_alloc(iommu_group, type);
231 err = dev_set_name(&group->dev, "%s%d",
232 group->type == VFIO_NO_IOMMU ? "noiommu-" : "",
233 iommu_group_id(iommu_group));
239 mutex_lock(&vfio.group_lock);
241 /* Did we race creating this group? */
242 ret = __vfio_group_get_from_iommu(iommu_group);
246 err = cdev_device_add(&group->cdev, &group->dev);
252 list_add(&group->vfio_next, &vfio.group_list);
254 mutex_unlock(&vfio.group_lock);
258 mutex_unlock(&vfio.group_lock);
260 put_device(&group->dev);
264 static void vfio_device_remove_group(struct vfio_device *device)
266 struct vfio_group *group = device->group;
267 struct iommu_group *iommu_group;
269 if (group->type == VFIO_NO_IOMMU || group->type == VFIO_EMULATED_IOMMU)
270 iommu_group_remove_device(device->dev);
272 /* Pairs with vfio_create_group() / vfio_group_get_from_iommu() */
273 if (!refcount_dec_and_mutex_lock(&group->drivers, &vfio.group_lock))
275 list_del(&group->vfio_next);
278 * We could concurrently probe another driver in the group that might
279 * race vfio_device_remove_group() with vfio_get_group(), so we have to
280 * ensure that the sysfs is all cleaned up under lock otherwise the
281 * cdev_device_add() will fail due to the name aready existing.
283 cdev_device_del(&group->cdev, &group->dev);
285 mutex_lock(&group->group_lock);
287 * These data structures all have paired operations that can only be
288 * undone when the caller holds a live reference on the device. Since
289 * all pairs must be undone these WARN_ON's indicate some caller did not
290 * properly hold the group reference.
292 WARN_ON(!list_empty(&group->device_list));
293 WARN_ON(group->notifier.head);
296 * Revoke all users of group->iommu_group. At this point we know there
297 * are no devices active because we are unplugging the last one. Setting
298 * iommu_group to NULL blocks all new users.
300 if (group->container)
301 vfio_group_detach_container(group);
302 iommu_group = group->iommu_group;
303 group->iommu_group = NULL;
304 mutex_unlock(&group->group_lock);
305 mutex_unlock(&vfio.group_lock);
307 iommu_group_put(iommu_group);
308 put_device(&group->dev);
312 * Device objects - create, release, get, put, search
314 /* Device reference always implies a group reference */
315 static void vfio_device_put_registration(struct vfio_device *device)
317 if (refcount_dec_and_test(&device->refcount))
318 complete(&device->comp);
321 static bool vfio_device_try_get_registration(struct vfio_device *device)
323 return refcount_inc_not_zero(&device->refcount);
326 static struct vfio_device *vfio_group_get_device(struct vfio_group *group,
329 struct vfio_device *device;
331 mutex_lock(&group->device_lock);
332 list_for_each_entry(device, &group->device_list, group_next) {
333 if (device->dev == dev &&
334 vfio_device_try_get_registration(device)) {
335 mutex_unlock(&group->device_lock);
339 mutex_unlock(&group->device_lock);
346 /* Release helper called by vfio_put_device() */
347 static void vfio_device_release(struct device *dev)
349 struct vfio_device *device =
350 container_of(dev, struct vfio_device, device);
352 vfio_release_device_set(device);
353 ida_free(&vfio.device_ida, device->index);
356 * kvfree() cannot be done here due to a life cycle mess in
357 * vfio-ccw. Before the ccw part is fixed all drivers are
358 * required to support @release and call vfio_free_device()
361 device->ops->release(device);
365 * Allocate and initialize vfio_device so it can be registered to vfio
368 * Drivers should use the wrapper vfio_alloc_device() for allocation.
369 * @size is the size of the structure to be allocated, including any
370 * private data used by the driver.
372 * Driver may provide an @init callback to cover device private data.
374 * Use vfio_put_device() to release the structure after success return.
376 struct vfio_device *_vfio_alloc_device(size_t size, struct device *dev,
377 const struct vfio_device_ops *ops)
379 struct vfio_device *device;
382 if (WARN_ON(size < sizeof(struct vfio_device)))
383 return ERR_PTR(-EINVAL);
385 device = kvzalloc(size, GFP_KERNEL);
387 return ERR_PTR(-ENOMEM);
389 ret = vfio_init_device(device, dev, ops);
398 EXPORT_SYMBOL_GPL(_vfio_alloc_device);
401 * Initialize a vfio_device so it can be registered to vfio core.
403 * Only vfio-ccw driver should call this interface.
405 int vfio_init_device(struct vfio_device *device, struct device *dev,
406 const struct vfio_device_ops *ops)
410 ret = ida_alloc_max(&vfio.device_ida, MINORMASK, GFP_KERNEL);
412 dev_dbg(dev, "Error to alloc index\n");
417 init_completion(&device->comp);
422 ret = ops->init(device);
427 device_initialize(&device->device);
428 device->device.release = vfio_device_release;
429 device->device.class = vfio.device_class;
430 device->device.parent = device->dev;
434 vfio_release_device_set(device);
435 ida_free(&vfio.device_ida, device->index);
438 EXPORT_SYMBOL_GPL(vfio_init_device);
441 * The helper called by driver @release callback to free the device
442 * structure. Drivers which don't have private data to clean can
443 * simply use this helper as its @release.
445 void vfio_free_device(struct vfio_device *device)
449 EXPORT_SYMBOL_GPL(vfio_free_device);
451 static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev,
452 enum vfio_group_type type)
454 struct iommu_group *iommu_group;
455 struct vfio_group *group;
458 iommu_group = iommu_group_alloc();
459 if (IS_ERR(iommu_group))
460 return ERR_CAST(iommu_group);
462 ret = iommu_group_set_name(iommu_group, "vfio-noiommu");
465 ret = iommu_group_add_device(iommu_group, dev);
469 group = vfio_create_group(iommu_group, type);
471 ret = PTR_ERR(group);
472 goto out_remove_device;
474 iommu_group_put(iommu_group);
478 iommu_group_remove_device(dev);
480 iommu_group_put(iommu_group);
484 static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
486 struct iommu_group *iommu_group;
487 struct vfio_group *group;
489 iommu_group = iommu_group_get(dev);
490 if (!iommu_group && vfio_noiommu) {
492 * With noiommu enabled, create an IOMMU group for devices that
493 * don't already have one, implying no IOMMU hardware/driver
494 * exists. Taint the kernel because we're about to give a DMA
495 * capable device to a user without IOMMU protection.
497 group = vfio_noiommu_group_alloc(dev, VFIO_NO_IOMMU);
498 if (!IS_ERR(group)) {
499 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
500 dev_warn(dev, "Adding kernel taint for vfio-noiommu group on device\n");
506 return ERR_PTR(-EINVAL);
509 * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
510 * restore cache coherency. It has to be checked here because it is only
511 * valid for cases where we are using iommu groups.
513 if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
514 iommu_group_put(iommu_group);
515 return ERR_PTR(-EINVAL);
518 group = vfio_group_get_from_iommu(iommu_group);
520 group = vfio_create_group(iommu_group, VFIO_IOMMU);
522 /* The vfio_group holds a reference to the iommu_group */
523 iommu_group_put(iommu_group);
527 static int __vfio_register_dev(struct vfio_device *device,
528 struct vfio_group *group)
530 struct vfio_device *existing_device;
534 * In all cases group is the output of one of the group allocation
535 * functions and we have group->drivers incremented for us.
538 return PTR_ERR(group);
541 * If the driver doesn't specify a set then the device is added to a
542 * singleton set just for itself.
544 if (!device->dev_set)
545 vfio_assign_device_set(device, device);
547 existing_device = vfio_group_get_device(group, device->dev);
548 if (existing_device) {
550 * group->iommu_group is non-NULL because we hold the drivers
553 dev_WARN(device->dev, "Device already exists on group %d\n",
554 iommu_group_id(group->iommu_group));
555 vfio_device_put_registration(existing_device);
560 /* Our reference on group is moved to the device */
561 device->group = group;
563 ret = dev_set_name(&device->device, "vfio%d", device->index);
567 ret = device_add(&device->device);
571 /* Refcounting can't start until the driver calls register */
572 refcount_set(&device->refcount, 1);
574 mutex_lock(&group->device_lock);
575 list_add(&device->group_next, &group->device_list);
576 mutex_unlock(&group->device_lock);
580 vfio_device_remove_group(device);
584 int vfio_register_group_dev(struct vfio_device *device)
586 return __vfio_register_dev(device,
587 vfio_group_find_or_alloc(device->dev));
589 EXPORT_SYMBOL_GPL(vfio_register_group_dev);
592 * Register a virtual device without IOMMU backing. The user of this
593 * device must not be able to directly trigger unmediated DMA.
595 int vfio_register_emulated_iommu_dev(struct vfio_device *device)
597 return __vfio_register_dev(device,
598 vfio_noiommu_group_alloc(device->dev, VFIO_EMULATED_IOMMU));
600 EXPORT_SYMBOL_GPL(vfio_register_emulated_iommu_dev);
602 static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
605 struct vfio_device *it, *device = ERR_PTR(-ENODEV);
607 mutex_lock(&group->device_lock);
608 list_for_each_entry(it, &group->device_list, group_next) {
611 if (it->ops->match) {
612 ret = it->ops->match(it, buf);
614 device = ERR_PTR(ret);
618 ret = !strcmp(dev_name(it->dev), buf);
621 if (ret && vfio_device_try_get_registration(it)) {
626 mutex_unlock(&group->device_lock);
632 * Decrement the device reference count and wait for the device to be
633 * removed. Open file descriptors for the device... */
634 void vfio_unregister_group_dev(struct vfio_device *device)
636 struct vfio_group *group = device->group;
638 bool interrupted = false;
641 vfio_device_put_registration(device);
642 rc = try_wait_for_completion(&device->comp);
644 if (device->ops->request)
645 device->ops->request(device, i++);
648 rc = wait_for_completion_timeout(&device->comp,
651 rc = wait_for_completion_interruptible_timeout(
652 &device->comp, HZ * 10);
655 dev_warn(device->dev,
656 "Device is currently in use, task"
658 "blocked until device is released",
659 current->comm, task_pid_nr(current));
664 mutex_lock(&group->device_lock);
665 list_del(&device->group_next);
666 mutex_unlock(&group->device_lock);
668 /* Balances device_add in register path */
669 device_del(&device->device);
671 vfio_device_remove_group(device);
673 EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
676 * VFIO Group fd, /dev/vfio/$GROUP
679 * VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or
680 * if there was no container to unset. Since the ioctl is called on
681 * the group, we know that still exists, therefore the only valid
682 * transition here is 1->0.
684 static int vfio_group_ioctl_unset_container(struct vfio_group *group)
688 mutex_lock(&group->group_lock);
689 if (!group->container) {
693 if (group->container_users != 1) {
697 vfio_group_detach_container(group);
700 mutex_unlock(&group->group_lock);
704 static int vfio_group_ioctl_set_container(struct vfio_group *group,
707 struct vfio_container *container;
712 if (get_user(fd, arg))
719 mutex_lock(&group->group_lock);
720 if (group->container || WARN_ON(group->container_users)) {
724 if (!group->iommu_group) {
729 container = vfio_container_from_file(f.file);
732 ret = vfio_container_attach_group(container, group);
737 mutex_unlock(&group->group_lock);
742 static const struct file_operations vfio_device_fops;
744 /* true if the vfio_device has open_device() called but not close_device() */
745 bool vfio_assert_device_open(struct vfio_device *device)
747 return !WARN_ON_ONCE(!READ_ONCE(device->open_count));
750 static struct file *vfio_device_open(struct vfio_device *device)
755 mutex_lock(&device->group->group_lock);
756 ret = vfio_device_assign_container(device);
757 mutex_unlock(&device->group->group_lock);
761 if (!try_module_get(device->dev->driver->owner)) {
763 goto err_unassign_container;
766 mutex_lock(&device->dev_set->lock);
767 device->open_count++;
768 if (device->open_count == 1) {
770 * Here we pass the KVM pointer with the group under the read
771 * lock. If the device driver will use it, it must obtain a
772 * reference and release it during close_device.
774 mutex_lock(&device->group->group_lock);
775 device->kvm = device->group->kvm;
777 if (device->ops->open_device) {
778 ret = device->ops->open_device(device);
782 vfio_device_container_register(device);
783 mutex_unlock(&device->group->group_lock);
785 mutex_unlock(&device->dev_set->lock);
788 * We can't use anon_inode_getfd() because we need to modify
789 * the f_mode flags directly to allow more than just ioctls
791 filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
794 ret = PTR_ERR(filep);
795 goto err_close_device;
799 * TODO: add an anon_inode interface to do this.
800 * Appears to be missing by lack of need rather than
801 * explicitly prevented. Now there's need.
803 filep->f_mode |= (FMODE_PREAD | FMODE_PWRITE);
805 if (device->group->type == VFIO_NO_IOMMU)
806 dev_warn(device->dev, "vfio-noiommu device opened by user "
807 "(%s:%d)\n", current->comm, task_pid_nr(current));
809 * On success the ref of device is moved to the file and
810 * put in vfio_device_fops_release()
815 mutex_lock(&device->dev_set->lock);
816 mutex_lock(&device->group->group_lock);
817 if (device->open_count == 1) {
818 if (device->ops->close_device)
819 device->ops->close_device(device);
821 vfio_device_container_unregister(device);
824 mutex_unlock(&device->group->group_lock);
825 device->open_count--;
826 if (device->open_count == 0 && device->kvm)
828 mutex_unlock(&device->dev_set->lock);
829 module_put(device->dev->driver->owner);
830 err_unassign_container:
831 vfio_device_unassign_container(device);
835 static int vfio_group_ioctl_get_device_fd(struct vfio_group *group,
838 struct vfio_device *device;
844 buf = strndup_user(arg, PAGE_SIZE);
848 device = vfio_device_get_from_name(group, buf);
851 return PTR_ERR(device);
853 fdno = get_unused_fd_flags(O_CLOEXEC);
859 filep = vfio_device_open(device);
861 ret = PTR_ERR(filep);
865 fd_install(fdno, filep);
871 vfio_device_put_registration(device);
875 static int vfio_group_ioctl_get_status(struct vfio_group *group,
876 struct vfio_group_status __user *arg)
878 unsigned long minsz = offsetofend(struct vfio_group_status, flags);
879 struct vfio_group_status status;
881 if (copy_from_user(&status, arg, minsz))
884 if (status.argsz < minsz)
889 mutex_lock(&group->group_lock);
890 if (!group->iommu_group) {
891 mutex_unlock(&group->group_lock);
895 if (group->container)
896 status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET |
897 VFIO_GROUP_FLAGS_VIABLE;
898 else if (!iommu_group_dma_owner_claimed(group->iommu_group))
899 status.flags |= VFIO_GROUP_FLAGS_VIABLE;
900 mutex_unlock(&group->group_lock);
902 if (copy_to_user(arg, &status, minsz))
907 static long vfio_group_fops_unl_ioctl(struct file *filep,
908 unsigned int cmd, unsigned long arg)
910 struct vfio_group *group = filep->private_data;
911 void __user *uarg = (void __user *)arg;
914 case VFIO_GROUP_GET_DEVICE_FD:
915 return vfio_group_ioctl_get_device_fd(group, uarg);
916 case VFIO_GROUP_GET_STATUS:
917 return vfio_group_ioctl_get_status(group, uarg);
918 case VFIO_GROUP_SET_CONTAINER:
919 return vfio_group_ioctl_set_container(group, uarg);
920 case VFIO_GROUP_UNSET_CONTAINER:
921 return vfio_group_ioctl_unset_container(group);
927 static int vfio_group_fops_open(struct inode *inode, struct file *filep)
929 struct vfio_group *group =
930 container_of(inode->i_cdev, struct vfio_group, cdev);
933 mutex_lock(&group->group_lock);
936 * drivers can be zero if this races with vfio_device_remove_group(), it
937 * will be stable at 0 under the group rwsem
939 if (refcount_read(&group->drivers) == 0) {
944 if (group->type == VFIO_NO_IOMMU && !capable(CAP_SYS_RAWIO)) {
950 * Do we need multiple instances of the group open? Seems not.
952 if (group->opened_file) {
956 group->opened_file = filep;
957 filep->private_data = group;
960 mutex_unlock(&group->group_lock);
964 static int vfio_group_fops_release(struct inode *inode, struct file *filep)
966 struct vfio_group *group = filep->private_data;
968 filep->private_data = NULL;
970 mutex_lock(&group->group_lock);
972 * Device FDs hold a group file reference, therefore the group release
973 * is only called when there are no open devices.
975 WARN_ON(group->notifier.head);
976 if (group->container)
977 vfio_group_detach_container(group);
978 group->opened_file = NULL;
979 mutex_unlock(&group->group_lock);
983 static const struct file_operations vfio_group_fops = {
984 .owner = THIS_MODULE,
985 .unlocked_ioctl = vfio_group_fops_unl_ioctl,
986 .compat_ioctl = compat_ptr_ioctl,
987 .open = vfio_group_fops_open,
988 .release = vfio_group_fops_release,
992 * Wrapper around pm_runtime_resume_and_get().
993 * Return error code on failure or 0 on success.
995 static inline int vfio_device_pm_runtime_get(struct vfio_device *device)
997 struct device *dev = device->dev;
999 if (dev->driver && dev->driver->pm) {
1002 ret = pm_runtime_resume_and_get(dev);
1004 dev_info_ratelimited(dev,
1005 "vfio: runtime resume failed %d\n", ret);
1014 * Wrapper around pm_runtime_put().
1016 static inline void vfio_device_pm_runtime_put(struct vfio_device *device)
1018 struct device *dev = device->dev;
1020 if (dev->driver && dev->driver->pm)
1021 pm_runtime_put(dev);
1027 static int vfio_device_fops_release(struct inode *inode, struct file *filep)
1029 struct vfio_device *device = filep->private_data;
1031 mutex_lock(&device->dev_set->lock);
1032 vfio_assert_device_open(device);
1033 mutex_lock(&device->group->group_lock);
1034 if (device->open_count == 1) {
1035 if (device->ops->close_device)
1036 device->ops->close_device(device);
1038 vfio_device_container_unregister(device);
1040 mutex_unlock(&device->group->group_lock);
1041 device->open_count--;
1042 if (device->open_count == 0)
1044 mutex_unlock(&device->dev_set->lock);
1046 module_put(device->dev->driver->owner);
1048 vfio_device_unassign_container(device);
1050 vfio_device_put_registration(device);
1056 * vfio_mig_get_next_state - Compute the next step in the FSM
1057 * @cur_fsm - The current state the device is in
1058 * @new_fsm - The target state to reach
1059 * @next_fsm - Pointer to the next step to get to new_fsm
1061 * Return 0 upon success, otherwise -errno
1062 * Upon success the next step in the state progression between cur_fsm and
1063 * new_fsm will be set in next_fsm.
1065 * This breaks down requests for combination transitions into smaller steps and
1066 * returns the next step to get to new_fsm. The function may need to be called
1067 * multiple times before reaching new_fsm.
1070 int vfio_mig_get_next_state(struct vfio_device *device,
1071 enum vfio_device_mig_state cur_fsm,
1072 enum vfio_device_mig_state new_fsm,
1073 enum vfio_device_mig_state *next_fsm)
1075 enum { VFIO_DEVICE_NUM_STATES = VFIO_DEVICE_STATE_RUNNING_P2P + 1 };
1077 * The coding in this table requires the driver to implement the
1078 * following FSM arcs:
1084 * If P2P is supported then the driver must also implement these FSM
1086 * RUNNING -> RUNNING_P2P
1087 * RUNNING_P2P -> RUNNING
1088 * RUNNING_P2P -> STOP
1089 * STOP -> RUNNING_P2P
1090 * Without P2P the driver must implement:
1094 * The coding will step through multiple states for some combination
1095 * transitions; if all optional features are supported, this means the
1097 * RESUMING -> STOP -> RUNNING_P2P
1098 * RESUMING -> STOP -> RUNNING_P2P -> RUNNING
1099 * RESUMING -> STOP -> STOP_COPY
1100 * RUNNING -> RUNNING_P2P -> STOP
1101 * RUNNING -> RUNNING_P2P -> STOP -> RESUMING
1102 * RUNNING -> RUNNING_P2P -> STOP -> STOP_COPY
1103 * RUNNING_P2P -> STOP -> RESUMING
1104 * RUNNING_P2P -> STOP -> STOP_COPY
1105 * STOP -> RUNNING_P2P -> RUNNING
1106 * STOP_COPY -> STOP -> RESUMING
1107 * STOP_COPY -> STOP -> RUNNING_P2P
1108 * STOP_COPY -> STOP -> RUNNING_P2P -> RUNNING
1110 static const u8 vfio_from_fsm_table[VFIO_DEVICE_NUM_STATES][VFIO_DEVICE_NUM_STATES] = {
1111 [VFIO_DEVICE_STATE_STOP] = {
1112 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_STOP,
1113 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_RUNNING_P2P,
1114 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_STOP_COPY,
1115 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_RESUMING,
1116 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_RUNNING_P2P,
1117 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1119 [VFIO_DEVICE_STATE_RUNNING] = {
1120 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_RUNNING_P2P,
1121 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_RUNNING,
1122 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_RUNNING_P2P,
1123 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_RUNNING_P2P,
1124 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_RUNNING_P2P,
1125 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1127 [VFIO_DEVICE_STATE_STOP_COPY] = {
1128 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_STOP,
1129 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_STOP,
1130 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_STOP_COPY,
1131 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_STOP,
1132 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_STOP,
1133 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1135 [VFIO_DEVICE_STATE_RESUMING] = {
1136 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_STOP,
1137 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_STOP,
1138 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_STOP,
1139 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_RESUMING,
1140 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_STOP,
1141 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1143 [VFIO_DEVICE_STATE_RUNNING_P2P] = {
1144 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_STOP,
1145 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_RUNNING,
1146 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_STOP,
1147 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_STOP,
1148 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_RUNNING_P2P,
1149 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1151 [VFIO_DEVICE_STATE_ERROR] = {
1152 [VFIO_DEVICE_STATE_STOP] = VFIO_DEVICE_STATE_ERROR,
1153 [VFIO_DEVICE_STATE_RUNNING] = VFIO_DEVICE_STATE_ERROR,
1154 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_DEVICE_STATE_ERROR,
1155 [VFIO_DEVICE_STATE_RESUMING] = VFIO_DEVICE_STATE_ERROR,
1156 [VFIO_DEVICE_STATE_RUNNING_P2P] = VFIO_DEVICE_STATE_ERROR,
1157 [VFIO_DEVICE_STATE_ERROR] = VFIO_DEVICE_STATE_ERROR,
1161 static const unsigned int state_flags_table[VFIO_DEVICE_NUM_STATES] = {
1162 [VFIO_DEVICE_STATE_STOP] = VFIO_MIGRATION_STOP_COPY,
1163 [VFIO_DEVICE_STATE_RUNNING] = VFIO_MIGRATION_STOP_COPY,
1164 [VFIO_DEVICE_STATE_STOP_COPY] = VFIO_MIGRATION_STOP_COPY,
1165 [VFIO_DEVICE_STATE_RESUMING] = VFIO_MIGRATION_STOP_COPY,
1166 [VFIO_DEVICE_STATE_RUNNING_P2P] =
1167 VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P,
1168 [VFIO_DEVICE_STATE_ERROR] = ~0U,
1171 if (WARN_ON(cur_fsm >= ARRAY_SIZE(vfio_from_fsm_table) ||
1172 (state_flags_table[cur_fsm] & device->migration_flags) !=
1173 state_flags_table[cur_fsm]))
1176 if (new_fsm >= ARRAY_SIZE(vfio_from_fsm_table) ||
1177 (state_flags_table[new_fsm] & device->migration_flags) !=
1178 state_flags_table[new_fsm])
1182 * Arcs touching optional and unsupported states are skipped over. The
1183 * driver will instead see an arc from the original state to the next
1184 * logical state, as per the above comment.
1186 *next_fsm = vfio_from_fsm_table[cur_fsm][new_fsm];
1187 while ((state_flags_table[*next_fsm] & device->migration_flags) !=
1188 state_flags_table[*next_fsm])
1189 *next_fsm = vfio_from_fsm_table[*next_fsm][new_fsm];
1191 return (*next_fsm != VFIO_DEVICE_STATE_ERROR) ? 0 : -EINVAL;
1193 EXPORT_SYMBOL_GPL(vfio_mig_get_next_state);
1196 * Convert the drivers's struct file into a FD number and return it to userspace
1198 static int vfio_ioct_mig_return_fd(struct file *filp, void __user *arg,
1199 struct vfio_device_feature_mig_state *mig)
1204 fd = get_unused_fd_flags(O_CLOEXEC);
1211 if (copy_to_user(arg, mig, sizeof(*mig))) {
1213 goto out_put_unused;
1215 fd_install(fd, filp);
1226 vfio_ioctl_device_feature_mig_device_state(struct vfio_device *device,
1227 u32 flags, void __user *arg,
1231 offsetofend(struct vfio_device_feature_mig_state, data_fd);
1232 struct vfio_device_feature_mig_state mig;
1233 struct file *filp = NULL;
1236 if (!device->mig_ops)
1239 ret = vfio_check_feature(flags, argsz,
1240 VFIO_DEVICE_FEATURE_SET |
1241 VFIO_DEVICE_FEATURE_GET,
1246 if (copy_from_user(&mig, arg, minsz))
1249 if (flags & VFIO_DEVICE_FEATURE_GET) {
1250 enum vfio_device_mig_state curr_state;
1252 ret = device->mig_ops->migration_get_state(device,
1256 mig.device_state = curr_state;
1260 /* Handle the VFIO_DEVICE_FEATURE_SET */
1261 filp = device->mig_ops->migration_set_state(device, mig.device_state);
1262 if (IS_ERR(filp) || !filp)
1265 return vfio_ioct_mig_return_fd(filp, arg, &mig);
1268 if (copy_to_user(arg, &mig, sizeof(mig)))
1271 return PTR_ERR(filp);
1275 static int vfio_ioctl_device_feature_migration(struct vfio_device *device,
1276 u32 flags, void __user *arg,
1279 struct vfio_device_feature_migration mig = {
1280 .flags = device->migration_flags,
1284 if (!device->mig_ops)
1287 ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_GET,
1291 if (copy_to_user(arg, &mig, sizeof(mig)))
1296 /* Ranges should fit into a single kernel page */
1297 #define LOG_MAX_RANGES \
1298 (PAGE_SIZE / sizeof(struct vfio_device_feature_dma_logging_range))
1301 vfio_ioctl_device_feature_logging_start(struct vfio_device *device,
1302 u32 flags, void __user *arg,
1306 offsetofend(struct vfio_device_feature_dma_logging_control,
1308 struct vfio_device_feature_dma_logging_range __user *ranges;
1309 struct vfio_device_feature_dma_logging_control control;
1310 struct vfio_device_feature_dma_logging_range range;
1311 struct rb_root_cached root = RB_ROOT_CACHED;
1312 struct interval_tree_node *nodes;
1317 if (!device->log_ops)
1320 ret = vfio_check_feature(flags, argsz,
1321 VFIO_DEVICE_FEATURE_SET,
1326 if (copy_from_user(&control, arg, minsz))
1329 nnodes = control.num_ranges;
1333 if (nnodes > LOG_MAX_RANGES)
1336 ranges = u64_to_user_ptr(control.ranges);
1337 nodes = kmalloc_array(nnodes, sizeof(struct interval_tree_node),
1342 for (i = 0; i < nnodes; i++) {
1343 if (copy_from_user(&range, &ranges[i], sizeof(range))) {
1347 if (!IS_ALIGNED(range.iova, control.page_size) ||
1348 !IS_ALIGNED(range.length, control.page_size)) {
1353 if (check_add_overflow(range.iova, range.length, &iova_end) ||
1354 iova_end > ULONG_MAX) {
1359 nodes[i].start = range.iova;
1360 nodes[i].last = range.iova + range.length - 1;
1361 if (interval_tree_iter_first(&root, nodes[i].start,
1363 /* Range overlapping */
1367 interval_tree_insert(nodes + i, &root);
1370 ret = device->log_ops->log_start(device, &root, nnodes,
1371 &control.page_size);
1375 if (copy_to_user(arg, &control, sizeof(control))) {
1377 device->log_ops->log_stop(device);
1386 vfio_ioctl_device_feature_logging_stop(struct vfio_device *device,
1387 u32 flags, void __user *arg,
1392 if (!device->log_ops)
1395 ret = vfio_check_feature(flags, argsz,
1396 VFIO_DEVICE_FEATURE_SET, 0);
1400 return device->log_ops->log_stop(device);
1403 static int vfio_device_log_read_and_clear(struct iova_bitmap *iter,
1404 unsigned long iova, size_t length,
1407 struct vfio_device *device = opaque;
1409 return device->log_ops->log_read_and_clear(device, iova, length, iter);
1413 vfio_ioctl_device_feature_logging_report(struct vfio_device *device,
1414 u32 flags, void __user *arg,
1418 offsetofend(struct vfio_device_feature_dma_logging_report,
1420 struct vfio_device_feature_dma_logging_report report;
1421 struct iova_bitmap *iter;
1425 if (!device->log_ops)
1428 ret = vfio_check_feature(flags, argsz,
1429 VFIO_DEVICE_FEATURE_GET,
1434 if (copy_from_user(&report, arg, minsz))
1437 if (report.page_size < SZ_4K || !is_power_of_2(report.page_size))
1440 if (check_add_overflow(report.iova, report.length, &iova_end) ||
1441 iova_end > ULONG_MAX)
1444 iter = iova_bitmap_alloc(report.iova, report.length,
1446 u64_to_user_ptr(report.bitmap));
1448 return PTR_ERR(iter);
1450 ret = iova_bitmap_for_each(iter, device,
1451 vfio_device_log_read_and_clear);
1453 iova_bitmap_free(iter);
1457 static int vfio_ioctl_device_feature(struct vfio_device *device,
1458 struct vfio_device_feature __user *arg)
1460 size_t minsz = offsetofend(struct vfio_device_feature, flags);
1461 struct vfio_device_feature feature;
1463 if (copy_from_user(&feature, arg, minsz))
1466 if (feature.argsz < minsz)
1469 /* Check unknown flags */
1471 ~(VFIO_DEVICE_FEATURE_MASK | VFIO_DEVICE_FEATURE_SET |
1472 VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_PROBE))
1475 /* GET & SET are mutually exclusive except with PROBE */
1476 if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
1477 (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
1478 (feature.flags & VFIO_DEVICE_FEATURE_GET))
1481 switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
1482 case VFIO_DEVICE_FEATURE_MIGRATION:
1483 return vfio_ioctl_device_feature_migration(
1484 device, feature.flags, arg->data,
1485 feature.argsz - minsz);
1486 case VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE:
1487 return vfio_ioctl_device_feature_mig_device_state(
1488 device, feature.flags, arg->data,
1489 feature.argsz - minsz);
1490 case VFIO_DEVICE_FEATURE_DMA_LOGGING_START:
1491 return vfio_ioctl_device_feature_logging_start(
1492 device, feature.flags, arg->data,
1493 feature.argsz - minsz);
1494 case VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP:
1495 return vfio_ioctl_device_feature_logging_stop(
1496 device, feature.flags, arg->data,
1497 feature.argsz - minsz);
1498 case VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT:
1499 return vfio_ioctl_device_feature_logging_report(
1500 device, feature.flags, arg->data,
1501 feature.argsz - minsz);
1503 if (unlikely(!device->ops->device_feature))
1505 return device->ops->device_feature(device, feature.flags,
1507 feature.argsz - minsz);
1511 static long vfio_device_fops_unl_ioctl(struct file *filep,
1512 unsigned int cmd, unsigned long arg)
1514 struct vfio_device *device = filep->private_data;
1517 ret = vfio_device_pm_runtime_get(device);
1522 case VFIO_DEVICE_FEATURE:
1523 ret = vfio_ioctl_device_feature(device, (void __user *)arg);
1527 if (unlikely(!device->ops->ioctl))
1530 ret = device->ops->ioctl(device, cmd, arg);
1534 vfio_device_pm_runtime_put(device);
1538 static ssize_t vfio_device_fops_read(struct file *filep, char __user *buf,
1539 size_t count, loff_t *ppos)
1541 struct vfio_device *device = filep->private_data;
1543 if (unlikely(!device->ops->read))
1546 return device->ops->read(device, buf, count, ppos);
1549 static ssize_t vfio_device_fops_write(struct file *filep,
1550 const char __user *buf,
1551 size_t count, loff_t *ppos)
1553 struct vfio_device *device = filep->private_data;
1555 if (unlikely(!device->ops->write))
1558 return device->ops->write(device, buf, count, ppos);
1561 static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma)
1563 struct vfio_device *device = filep->private_data;
1565 if (unlikely(!device->ops->mmap))
1568 return device->ops->mmap(device, vma);
1571 static const struct file_operations vfio_device_fops = {
1572 .owner = THIS_MODULE,
1573 .release = vfio_device_fops_release,
1574 .read = vfio_device_fops_read,
1575 .write = vfio_device_fops_write,
1576 .unlocked_ioctl = vfio_device_fops_unl_ioctl,
1577 .compat_ioctl = compat_ptr_ioctl,
1578 .mmap = vfio_device_fops_mmap,
1582 * vfio_file_iommu_group - Return the struct iommu_group for the vfio group file
1583 * @file: VFIO group file
1585 * The returned iommu_group is valid as long as a ref is held on the file. This
1586 * returns a reference on the group. This function is deprecated, only the SPAPR
1587 * path in kvm should call it.
1589 struct iommu_group *vfio_file_iommu_group(struct file *file)
1591 struct vfio_group *group = file->private_data;
1592 struct iommu_group *iommu_group = NULL;
1594 if (!IS_ENABLED(CONFIG_SPAPR_TCE_IOMMU))
1597 if (!vfio_file_is_group(file))
1600 mutex_lock(&group->group_lock);
1601 if (group->iommu_group) {
1602 iommu_group = group->iommu_group;
1603 iommu_group_ref_get(iommu_group);
1605 mutex_unlock(&group->group_lock);
1608 EXPORT_SYMBOL_GPL(vfio_file_iommu_group);
1611 * vfio_file_is_group - True if the file is usable with VFIO aPIS
1612 * @file: VFIO group file
1614 bool vfio_file_is_group(struct file *file)
1616 return file->f_op == &vfio_group_fops;
1618 EXPORT_SYMBOL_GPL(vfio_file_is_group);
1621 * vfio_file_enforced_coherent - True if the DMA associated with the VFIO file
1622 * is always CPU cache coherent
1623 * @file: VFIO group file
1625 * Enforced coherency means that the IOMMU ignores things like the PCIe no-snoop
1626 * bit in DMA transactions. A return of false indicates that the user has
1627 * rights to access additional instructions such as wbinvd on x86.
1629 bool vfio_file_enforced_coherent(struct file *file)
1631 struct vfio_group *group = file->private_data;
1634 if (!vfio_file_is_group(file))
1637 mutex_lock(&group->group_lock);
1638 if (group->container) {
1639 ret = vfio_container_ioctl_check_extension(group->container,
1643 * Since the coherency state is determined only once a container
1644 * is attached the user must do so before they can prove they
1649 mutex_unlock(&group->group_lock);
1652 EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
1655 * vfio_file_set_kvm - Link a kvm with VFIO drivers
1656 * @file: VFIO group file
1659 * When a VFIO device is first opened the KVM will be available in
1660 * device->kvm if one was associated with the group.
1662 void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
1664 struct vfio_group *group = file->private_data;
1666 if (!vfio_file_is_group(file))
1669 mutex_lock(&group->group_lock);
1671 mutex_unlock(&group->group_lock);
1673 EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
1676 * vfio_file_has_dev - True if the VFIO file is a handle for device
1677 * @file: VFIO file to check
1678 * @device: Device that must be part of the file
1680 * Returns true if given file has permission to manipulate the given device.
1682 bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
1684 struct vfio_group *group = file->private_data;
1686 if (!vfio_file_is_group(file))
1689 return group == device->group;
1691 EXPORT_SYMBOL_GPL(vfio_file_has_dev);
1694 * Sub-module support
1697 * Helper for managing a buffer of info chain capabilities, allocate or
1698 * reallocate a buffer with additional @size, filling in @id and @version
1699 * of the capability. A pointer to the new capability is returned.
1701 * NB. The chain is based at the head of the buffer, so new entries are
1702 * added to the tail, vfio_info_cap_shift() should be called to fixup the
1703 * next offsets prior to copying to the user buffer.
1705 struct vfio_info_cap_header *vfio_info_cap_add(struct vfio_info_cap *caps,
1706 size_t size, u16 id, u16 version)
1709 struct vfio_info_cap_header *header, *tmp;
1711 buf = krealloc(caps->buf, caps->size + size, GFP_KERNEL);
1716 return ERR_PTR(-ENOMEM);
1720 header = buf + caps->size;
1722 /* Eventually copied to user buffer, zero */
1723 memset(header, 0, size);
1726 header->version = version;
1728 /* Add to the end of the capability chain */
1729 for (tmp = buf; tmp->next; tmp = buf + tmp->next)
1732 tmp->next = caps->size;
1737 EXPORT_SYMBOL_GPL(vfio_info_cap_add);
1739 void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset)
1741 struct vfio_info_cap_header *tmp;
1742 void *buf = (void *)caps->buf;
1744 for (tmp = buf; tmp->next; tmp = buf + tmp->next - offset)
1745 tmp->next += offset;
1747 EXPORT_SYMBOL(vfio_info_cap_shift);
1749 int vfio_info_add_capability(struct vfio_info_cap *caps,
1750 struct vfio_info_cap_header *cap, size_t size)
1752 struct vfio_info_cap_header *header;
1754 header = vfio_info_cap_add(caps, size, cap->id, cap->version);
1756 return PTR_ERR(header);
1758 memcpy(header + 1, cap + 1, size - sizeof(*header));
1762 EXPORT_SYMBOL(vfio_info_add_capability);
1764 int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, int num_irqs,
1765 int max_irq_type, size_t *data_size)
1767 unsigned long minsz;
1770 minsz = offsetofend(struct vfio_irq_set, count);
1772 if ((hdr->argsz < minsz) || (hdr->index >= max_irq_type) ||
1773 (hdr->count >= (U32_MAX - hdr->start)) ||
1774 (hdr->flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
1775 VFIO_IRQ_SET_ACTION_TYPE_MASK)))
1781 if (hdr->start >= num_irqs || hdr->start + hdr->count > num_irqs)
1784 switch (hdr->flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
1785 case VFIO_IRQ_SET_DATA_NONE:
1788 case VFIO_IRQ_SET_DATA_BOOL:
1789 size = sizeof(uint8_t);
1791 case VFIO_IRQ_SET_DATA_EVENTFD:
1792 size = sizeof(int32_t);
1799 if (hdr->argsz - minsz < hdr->count * size)
1805 *data_size = hdr->count * size;
1810 EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare);
1813 * Module/class support
1815 static char *vfio_devnode(struct device *dev, umode_t *mode)
1817 return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
1820 static int __init vfio_init(void)
1824 ida_init(&vfio.group_ida);
1825 ida_init(&vfio.device_ida);
1826 mutex_init(&vfio.group_lock);
1827 INIT_LIST_HEAD(&vfio.group_list);
1829 ret = vfio_container_init();
1833 /* /dev/vfio/$GROUP */
1834 vfio.class = class_create(THIS_MODULE, "vfio");
1835 if (IS_ERR(vfio.class)) {
1836 ret = PTR_ERR(vfio.class);
1837 goto err_group_class;
1840 vfio.class->devnode = vfio_devnode;
1842 /* /sys/class/vfio-dev/vfioX */
1843 vfio.device_class = class_create(THIS_MODULE, "vfio-dev");
1844 if (IS_ERR(vfio.device_class)) {
1845 ret = PTR_ERR(vfio.device_class);
1849 ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
1851 goto err_alloc_chrdev;
1853 pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1857 class_destroy(vfio.device_class);
1858 vfio.device_class = NULL;
1860 class_destroy(vfio.class);
1863 vfio_container_cleanup();
1867 static void __exit vfio_cleanup(void)
1869 WARN_ON(!list_empty(&vfio.group_list));
1871 ida_destroy(&vfio.device_ida);
1872 ida_destroy(&vfio.group_ida);
1873 unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
1874 class_destroy(vfio.device_class);
1875 vfio.device_class = NULL;
1876 class_destroy(vfio.class);
1877 vfio_container_cleanup();
1879 xa_destroy(&vfio_device_set_xa);
1882 module_init(vfio_init);
1883 module_exit(vfio_cleanup);
1885 MODULE_VERSION(DRIVER_VERSION);
1886 MODULE_LICENSE("GPL v2");
1887 MODULE_AUTHOR(DRIVER_AUTHOR);
1888 MODULE_DESCRIPTION(DRIVER_DESC);
1889 MODULE_ALIAS_MISCDEV(VFIO_MINOR);
1890 MODULE_ALIAS("devname:vfio/vfio");
1891 MODULE_SOFTDEP("post: vfio_iommu_type1 vfio_iommu_spapr_tce");