--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VFIO core
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ */
+
+#include <linux/vfio.h>
+#include <linux/iommufd.h>
+#include <linux/anon_inodes.h>
+#include "vfio.h"
+
+static struct vfio {
+ struct class *class;
+ struct list_head group_list;
+ struct mutex group_lock; /* locks group_list */
+ struct ida group_ida;
+ dev_t group_devt;
+} vfio;
+
+static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
+ char *buf)
+{
+ struct vfio_device *it, *device = ERR_PTR(-ENODEV);
+
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(it, &group->device_list, group_next) {
+ int ret;
+
+ if (it->ops->match) {
+ ret = it->ops->match(it, buf);
+ if (ret < 0) {
+ device = ERR_PTR(ret);
+ break;
+ }
+ } else {
+ ret = !strcmp(dev_name(it->dev), buf);
+ }
+
+ if (ret && vfio_device_try_get_registration(it)) {
+ device = it;
+ break;
+ }
+ }
+ mutex_unlock(&group->device_lock);
+
+ return device;
+}
+
+/*
+ * VFIO Group fd, /dev/vfio/$GROUP
+ */
+static bool vfio_group_has_iommu(struct vfio_group *group)
+{
+ lockdep_assert_held(&group->group_lock);
+ /*
+ * There can only be users if there is a container, and if there is a
+ * container there must be users.
+ */
+ WARN_ON(!group->container != !group->container_users);
+
+ return group->container || group->iommufd;
+}
+
+/*
+ * VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or
+ * if there was no container to unset. Since the ioctl is called on
+ * the group, we know that still exists, therefore the only valid
+ * transition here is 1->0.
+ */
+static int vfio_group_ioctl_unset_container(struct vfio_group *group)
+{
+ int ret = 0;
+
+ mutex_lock(&group->group_lock);
+ if (!vfio_group_has_iommu(group)) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+ if (group->container) {
+ if (group->container_users != 1) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ vfio_group_detach_container(group);
+ }
+ if (group->iommufd) {
+ iommufd_ctx_put(group->iommufd);
+ group->iommufd = NULL;
+ }
+
+out_unlock:
+ mutex_unlock(&group->group_lock);
+ return ret;
+}
+
+static int vfio_group_ioctl_set_container(struct vfio_group *group,
+ int __user *arg)
+{
+ struct vfio_container *container;
+ struct iommufd_ctx *iommufd;
+ struct fd f;
+ int ret;
+ int fd;
+
+ if (get_user(fd, arg))
+ return -EFAULT;
+
+ f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
+
+ mutex_lock(&group->group_lock);
+ if (vfio_group_has_iommu(group)) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+ if (!group->iommu_group) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ container = vfio_container_from_file(f.file);
+ if (container) {
+ ret = vfio_container_attach_group(container, group);
+ goto out_unlock;
+ }
+
+ iommufd = iommufd_ctx_from_file(f.file);
+ if (!IS_ERR(iommufd)) {
+ u32 ioas_id;
+
+ ret = iommufd_vfio_compat_ioas_id(iommufd, &ioas_id);
+ if (ret) {
+ iommufd_ctx_put(group->iommufd);
+ goto out_unlock;
+ }
+
+ group->iommufd = iommufd;
+ goto out_unlock;
+ }
+
+ /* The FD passed is not recognized. */
+ ret = -EBADFD;
+
+out_unlock:
+ mutex_unlock(&group->group_lock);
+ fdput(f);
+ return ret;
+}
+
+static int vfio_device_group_open(struct vfio_device *device)
+{
+ int ret;
+
+ mutex_lock(&device->group->group_lock);
+ if (!vfio_group_has_iommu(device->group)) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ /*
+ * Here we pass the KVM pointer with the group under the lock. If the
+ * device driver will use it, it must obtain a reference and release it
+ * during close_device.
+ */
+ ret = vfio_device_open(device, device->group->iommufd,
+ device->group->kvm);
+
+out_unlock:
+ mutex_unlock(&device->group->group_lock);
+ return ret;
+}
+
+void vfio_device_group_close(struct vfio_device *device)
+{
+ mutex_lock(&device->group->group_lock);
+ vfio_device_close(device, device->group->iommufd);
+ mutex_unlock(&device->group->group_lock);
+}
+
+static struct file *vfio_device_open_file(struct vfio_device *device)
+{
+ struct file *filep;
+ int ret;
+
+ ret = vfio_device_group_open(device);
+ if (ret)
+ goto err_out;
+
+ /*
+ * We can't use anon_inode_getfd() because we need to modify
+ * the f_mode flags directly to allow more than just ioctls
+ */
+ filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
+ device, O_RDWR);
+ if (IS_ERR(filep)) {
+ ret = PTR_ERR(filep);
+ goto err_close_device;
+ }
+
+ /*
+ * TODO: add an anon_inode interface to do this.
+ * Appears to be missing by lack of need rather than
+ * explicitly prevented. Now there's need.
+ */
+ filep->f_mode |= (FMODE_PREAD | FMODE_PWRITE);
+
+ if (device->group->type == VFIO_NO_IOMMU)
+ dev_warn(device->dev, "vfio-noiommu device opened by user "
+ "(%s:%d)\n", current->comm, task_pid_nr(current));
+ /*
+ * On success the ref of device is moved to the file and
+ * put in vfio_device_fops_release()
+ */
+ return filep;
+
+err_close_device:
+ vfio_device_group_close(device);
+err_out:
+ return ERR_PTR(ret);
+}
+
+static int vfio_group_ioctl_get_device_fd(struct vfio_group *group,
+ char __user *arg)
+{
+ struct vfio_device *device;
+ struct file *filep;
+ char *buf;
+ int fdno;
+ int ret;
+
+ buf = strndup_user(arg, PAGE_SIZE);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ device = vfio_device_get_from_name(group, buf);
+ kfree(buf);
+ if (IS_ERR(device))
+ return PTR_ERR(device);
+
+ fdno = get_unused_fd_flags(O_CLOEXEC);
+ if (fdno < 0) {
+ ret = fdno;
+ goto err_put_device;
+ }
+
+ filep = vfio_device_open_file(device);
+ if (IS_ERR(filep)) {
+ ret = PTR_ERR(filep);
+ goto err_put_fdno;
+ }
+
+ fd_install(fdno, filep);
+ return fdno;
+
+err_put_fdno:
+ put_unused_fd(fdno);
+err_put_device:
+ vfio_device_put_registration(device);
+ return ret;
+}
+
+static int vfio_group_ioctl_get_status(struct vfio_group *group,
+ struct vfio_group_status __user *arg)
+{
+ unsigned long minsz = offsetofend(struct vfio_group_status, flags);
+ struct vfio_group_status status;
+
+ if (copy_from_user(&status, arg, minsz))
+ return -EFAULT;
+
+ if (status.argsz < minsz)
+ return -EINVAL;
+
+ status.flags = 0;
+
+ mutex_lock(&group->group_lock);
+ if (!group->iommu_group) {
+ mutex_unlock(&group->group_lock);
+ return -ENODEV;
+ }
+
+ /*
+ * With the container FD the iommu_group_claim_dma_owner() is done
+ * during SET_CONTAINER but for IOMMFD this is done during
+ * VFIO_GROUP_GET_DEVICE_FD. Meaning that with iommufd
+ * VFIO_GROUP_FLAGS_VIABLE could be set but GET_DEVICE_FD will fail due
+ * to viability.
+ */
+ if (vfio_group_has_iommu(group))
+ status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET |
+ VFIO_GROUP_FLAGS_VIABLE;
+ else if (!iommu_group_dma_owner_claimed(group->iommu_group))
+ status.flags |= VFIO_GROUP_FLAGS_VIABLE;
+ mutex_unlock(&group->group_lock);
+
+ if (copy_to_user(arg, &status, minsz))
+ return -EFAULT;
+ return 0;
+}
+
+static long vfio_group_fops_unl_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_group *group = filep->private_data;
+ void __user *uarg = (void __user *)arg;
+
+ switch (cmd) {
+ case VFIO_GROUP_GET_DEVICE_FD:
+ return vfio_group_ioctl_get_device_fd(group, uarg);
+ case VFIO_GROUP_GET_STATUS:
+ return vfio_group_ioctl_get_status(group, uarg);
+ case VFIO_GROUP_SET_CONTAINER:
+ return vfio_group_ioctl_set_container(group, uarg);
+ case VFIO_GROUP_UNSET_CONTAINER:
+ return vfio_group_ioctl_unset_container(group);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static int vfio_group_fops_open(struct inode *inode, struct file *filep)
+{
+ struct vfio_group *group =
+ container_of(inode->i_cdev, struct vfio_group, cdev);
+ int ret;
+
+ mutex_lock(&group->group_lock);
+
+ /*
+ * drivers can be zero if this races with vfio_device_remove_group(), it
+ * will be stable at 0 under the group rwsem
+ */
+ if (refcount_read(&group->drivers) == 0) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ if (group->type == VFIO_NO_IOMMU && !capable(CAP_SYS_RAWIO)) {
+ ret = -EPERM;
+ goto out_unlock;
+ }
+
+ /*
+ * Do we need multiple instances of the group open? Seems not.
+ */
+ if (group->opened_file) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ group->opened_file = filep;
+ filep->private_data = group;
+ ret = 0;
+out_unlock:
+ mutex_unlock(&group->group_lock);
+ return ret;
+}
+
+static int vfio_group_fops_release(struct inode *inode, struct file *filep)
+{
+ struct vfio_group *group = filep->private_data;
+
+ filep->private_data = NULL;
+
+ mutex_lock(&group->group_lock);
+ /*
+ * Device FDs hold a group file reference, therefore the group release
+ * is only called when there are no open devices.
+ */
+ WARN_ON(group->notifier.head);
+ if (group->container)
+ vfio_group_detach_container(group);
+ if (group->iommufd) {
+ iommufd_ctx_put(group->iommufd);
+ group->iommufd = NULL;
+ }
+ group->opened_file = NULL;
+ mutex_unlock(&group->group_lock);
+ return 0;
+}
+
+static const struct file_operations vfio_group_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = vfio_group_fops_unl_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .open = vfio_group_fops_open,
+ .release = vfio_group_fops_release,
+};
+
+/*
+ * Group objects - create, release, get, put, search
+ */
+static struct vfio_group *
+vfio_group_find_from_iommu(struct iommu_group *iommu_group)
+{
+ struct vfio_group *group;
+
+ lockdep_assert_held(&vfio.group_lock);
+
+ /*
+ * group->iommu_group from the vfio.group_list cannot be NULL
+ * under the vfio.group_lock.
+ */
+ list_for_each_entry(group, &vfio.group_list, vfio_next) {
+ if (group->iommu_group == iommu_group)
+ return group;
+ }
+ return NULL;
+}
+
+static void vfio_group_release(struct device *dev)
+{
+ struct vfio_group *group = container_of(dev, struct vfio_group, dev);
+
+ mutex_destroy(&group->device_lock);
+ mutex_destroy(&group->group_lock);
+ WARN_ON(group->iommu_group);
+ ida_free(&vfio.group_ida, MINOR(group->dev.devt));
+ kfree(group);
+}
+
+static struct vfio_group *vfio_group_alloc(struct iommu_group *iommu_group,
+ enum vfio_group_type type)
+{
+ struct vfio_group *group;
+ int minor;
+
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ if (!group)
+ return ERR_PTR(-ENOMEM);
+
+ minor = ida_alloc_max(&vfio.group_ida, MINORMASK, GFP_KERNEL);
+ if (minor < 0) {
+ kfree(group);
+ return ERR_PTR(minor);
+ }
+
+ device_initialize(&group->dev);
+ group->dev.devt = MKDEV(MAJOR(vfio.group_devt), minor);
+ group->dev.class = vfio.class;
+ group->dev.release = vfio_group_release;
+ cdev_init(&group->cdev, &vfio_group_fops);
+ group->cdev.owner = THIS_MODULE;
+
+ refcount_set(&group->drivers, 1);
+ mutex_init(&group->group_lock);
+ INIT_LIST_HEAD(&group->device_list);
+ mutex_init(&group->device_lock);
+ group->iommu_group = iommu_group;
+ /* put in vfio_group_release() */
+ iommu_group_ref_get(iommu_group);
+ group->type = type;
+ BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
+
+ return group;
+}
+
+static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
+ enum vfio_group_type type)
+{
+ struct vfio_group *group;
+ struct vfio_group *ret;
+ int err;
+
+ lockdep_assert_held(&vfio.group_lock);
+
+ group = vfio_group_alloc(iommu_group, type);
+ if (IS_ERR(group))
+ return group;
+
+ err = dev_set_name(&group->dev, "%s%d",
+ group->type == VFIO_NO_IOMMU ? "noiommu-" : "",
+ iommu_group_id(iommu_group));
+ if (err) {
+ ret = ERR_PTR(err);
+ goto err_put;
+ }
+
+ err = cdev_device_add(&group->cdev, &group->dev);
+ if (err) {
+ ret = ERR_PTR(err);
+ goto err_put;
+ }
+
+ list_add(&group->vfio_next, &vfio.group_list);
+
+ return group;
+
+err_put:
+ put_device(&group->dev);
+ return ret;
+}
+
+static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev,
+ enum vfio_group_type type)
+{
+ struct iommu_group *iommu_group;
+ struct vfio_group *group;
+ int ret;
+
+ iommu_group = iommu_group_alloc();
+ if (IS_ERR(iommu_group))
+ return ERR_CAST(iommu_group);
+
+ ret = iommu_group_set_name(iommu_group, "vfio-noiommu");
+ if (ret)
+ goto out_put_group;
+ ret = iommu_group_add_device(iommu_group, dev);
+ if (ret)
+ goto out_put_group;
+
+ mutex_lock(&vfio.group_lock);
+ group = vfio_create_group(iommu_group, type);
+ mutex_unlock(&vfio.group_lock);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ goto out_remove_device;
+ }
+ iommu_group_put(iommu_group);
+ return group;
+
+out_remove_device:
+ iommu_group_remove_device(dev);
+out_put_group:
+ iommu_group_put(iommu_group);
+ return ERR_PTR(ret);
+}
+
+static bool vfio_group_has_device(struct vfio_group *group, struct device *dev)
+{
+ struct vfio_device *device;
+
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(device, &group->device_list, group_next) {
+ if (device->dev == dev) {
+ mutex_unlock(&group->device_lock);
+ return true;
+ }
+ }
+ mutex_unlock(&group->device_lock);
+ return false;
+}
+
+static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
+{
+ struct iommu_group *iommu_group;
+ struct vfio_group *group;
+
+ iommu_group = iommu_group_get(dev);
+ if (!iommu_group && vfio_noiommu) {
+ /*
+ * With noiommu enabled, create an IOMMU group for devices that
+ * don't already have one, implying no IOMMU hardware/driver
+ * exists. Taint the kernel because we're about to give a DMA
+ * capable device to a user without IOMMU protection.
+ */
+ group = vfio_noiommu_group_alloc(dev, VFIO_NO_IOMMU);
+ if (!IS_ERR(group)) {
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ dev_warn(dev, "Adding kernel taint for vfio-noiommu group on device\n");
+ }
+ return group;
+ }
+
+ if (!iommu_group)
+ return ERR_PTR(-EINVAL);
+
+ /*
+ * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
+ * restore cache coherency. It has to be checked here because it is only
+ * valid for cases where we are using iommu groups.
+ */
+ if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
+ iommu_group_put(iommu_group);
+ return ERR_PTR(-EINVAL);
+ }
+
+ mutex_lock(&vfio.group_lock);
+ group = vfio_group_find_from_iommu(iommu_group);
+ if (group) {
+ if (WARN_ON(vfio_group_has_device(group, dev)))
+ group = ERR_PTR(-EINVAL);
+ else
+ refcount_inc(&group->drivers);
+ } else {
+ group = vfio_create_group(iommu_group, VFIO_IOMMU);
+ }
+ mutex_unlock(&vfio.group_lock);
+
+ /* The vfio_group holds a reference to the iommu_group */
+ iommu_group_put(iommu_group);
+ return group;
+}
+
+int vfio_device_set_group(struct vfio_device *device,
+ enum vfio_group_type type)
+{
+ struct vfio_group *group;
+
+ if (type == VFIO_IOMMU)
+ group = vfio_group_find_or_alloc(device->dev);
+ else
+ group = vfio_noiommu_group_alloc(device->dev, type);
+
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+
+ /* Our reference on group is moved to the device */
+ device->group = group;
+ return 0;
+}
+
+void vfio_device_remove_group(struct vfio_device *device)
+{
+ struct vfio_group *group = device->group;
+ struct iommu_group *iommu_group;
+
+ if (group->type == VFIO_NO_IOMMU || group->type == VFIO_EMULATED_IOMMU)
+ iommu_group_remove_device(device->dev);
+
+ /* Pairs with vfio_create_group() / vfio_group_get_from_iommu() */
+ if (!refcount_dec_and_mutex_lock(&group->drivers, &vfio.group_lock))
+ return;
+ list_del(&group->vfio_next);
+
+ /*
+ * We could concurrently probe another driver in the group that might
+ * race vfio_device_remove_group() with vfio_get_group(), so we have to
+ * ensure that the sysfs is all cleaned up under lock otherwise the
+ * cdev_device_add() will fail due to the name aready existing.
+ */
+ cdev_device_del(&group->cdev, &group->dev);
+
+ mutex_lock(&group->group_lock);
+ /*
+ * These data structures all have paired operations that can only be
+ * undone when the caller holds a live reference on the device. Since
+ * all pairs must be undone these WARN_ON's indicate some caller did not
+ * properly hold the group reference.
+ */
+ WARN_ON(!list_empty(&group->device_list));
+ WARN_ON(group->notifier.head);
+
+ /*
+ * Revoke all users of group->iommu_group. At this point we know there
+ * are no devices active because we are unplugging the last one. Setting
+ * iommu_group to NULL blocks all new users.
+ */
+ if (group->container)
+ vfio_group_detach_container(group);
+ iommu_group = group->iommu_group;
+ group->iommu_group = NULL;
+ mutex_unlock(&group->group_lock);
+ mutex_unlock(&vfio.group_lock);
+
+ iommu_group_put(iommu_group);
+ put_device(&group->dev);
+}
+
+void vfio_device_group_register(struct vfio_device *device)
+{
+ mutex_lock(&device->group->device_lock);
+ list_add(&device->group_next, &device->group->device_list);
+ mutex_unlock(&device->group->device_lock);
+}
+
+void vfio_device_group_unregister(struct vfio_device *device)
+{
+ mutex_lock(&device->group->device_lock);
+ list_del(&device->group_next);
+ mutex_unlock(&device->group->device_lock);
+}
+
+int vfio_device_group_use_iommu(struct vfio_device *device)
+{
+ struct vfio_group *group = device->group;
+ int ret = 0;
+
+ lockdep_assert_held(&group->group_lock);
+
+ if (WARN_ON(!group->container))
+ return -EINVAL;
+
+ ret = vfio_group_use_container(group);
+ if (ret)
+ return ret;
+ vfio_device_container_register(device);
+ return 0;
+}
+
+void vfio_device_group_unuse_iommu(struct vfio_device *device)
+{
+ struct vfio_group *group = device->group;
+
+ lockdep_assert_held(&group->group_lock);
+
+ if (WARN_ON(!group->container))
+ return;
+
+ vfio_device_container_unregister(device);
+ vfio_group_unuse_container(group);
+}
+
+bool vfio_device_has_container(struct vfio_device *device)
+{
+ return device->group->container;
+}
+
+/**
+ * vfio_file_iommu_group - Return the struct iommu_group for the vfio group file
+ * @file: VFIO group file
+ *
+ * The returned iommu_group is valid as long as a ref is held on the file. This
+ * returns a reference on the group. This function is deprecated, only the SPAPR
+ * path in kvm should call it.
+ */
+struct iommu_group *vfio_file_iommu_group(struct file *file)
+{
+ struct vfio_group *group = file->private_data;
+ struct iommu_group *iommu_group = NULL;
+
+ if (!IS_ENABLED(CONFIG_SPAPR_TCE_IOMMU))
+ return NULL;
+
+ if (!vfio_file_is_group(file))
+ return NULL;
+
+ mutex_lock(&group->group_lock);
+ if (group->iommu_group) {
+ iommu_group = group->iommu_group;
+ iommu_group_ref_get(iommu_group);
+ }
+ mutex_unlock(&group->group_lock);
+ return iommu_group;
+}
+EXPORT_SYMBOL_GPL(vfio_file_iommu_group);
+
+/**
+ * vfio_file_is_group - True if the file is usable with VFIO aPIS
+ * @file: VFIO group file
+ */
+bool vfio_file_is_group(struct file *file)
+{
+ return file->f_op == &vfio_group_fops;
+}
+EXPORT_SYMBOL_GPL(vfio_file_is_group);
+
+/**
+ * vfio_file_enforced_coherent - True if the DMA associated with the VFIO file
+ * is always CPU cache coherent
+ * @file: VFIO group file
+ *
+ * Enforced coherency means that the IOMMU ignores things like the PCIe no-snoop
+ * bit in DMA transactions. A return of false indicates that the user has
+ * rights to access additional instructions such as wbinvd on x86.
+ */
+bool vfio_file_enforced_coherent(struct file *file)
+{
+ struct vfio_group *group = file->private_data;
+ struct vfio_device *device;
+ bool ret = true;
+
+ if (!vfio_file_is_group(file))
+ return true;
+
+ /*
+ * If the device does not have IOMMU_CAP_ENFORCE_CACHE_COHERENCY then
+ * any domain later attached to it will also not support it. If the cap
+ * is set then the iommu_domain eventually attached to the device/group
+ * must use a domain with enforce_cache_coherency().
+ */
+ mutex_lock(&group->device_lock);
+ list_for_each_entry(device, &group->device_list, group_next) {
+ if (!device_iommu_capable(device->dev,
+ IOMMU_CAP_ENFORCE_CACHE_COHERENCY)) {
+ ret = false;
+ break;
+ }
+ }
+ mutex_unlock(&group->device_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
+
+/**
+ * vfio_file_set_kvm - Link a kvm with VFIO drivers
+ * @file: VFIO group file
+ * @kvm: KVM to link
+ *
+ * When a VFIO device is first opened the KVM will be available in
+ * device->kvm if one was associated with the group.
+ */
+void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
+{
+ struct vfio_group *group = file->private_data;
+
+ if (!vfio_file_is_group(file))
+ return;
+
+ mutex_lock(&group->group_lock);
+ group->kvm = kvm;
+ mutex_unlock(&group->group_lock);
+}
+EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
+
+/**
+ * vfio_file_has_dev - True if the VFIO file is a handle for device
+ * @file: VFIO file to check
+ * @device: Device that must be part of the file
+ *
+ * Returns true if given file has permission to manipulate the given device.
+ */
+bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
+{
+ struct vfio_group *group = file->private_data;
+
+ if (!vfio_file_is_group(file))
+ return false;
+
+ return group == device->group;
+}
+EXPORT_SYMBOL_GPL(vfio_file_has_dev);
+
+static char *vfio_devnode(struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
+}
+
+int __init vfio_group_init(void)
+{
+ int ret;
+
+ ida_init(&vfio.group_ida);
+ mutex_init(&vfio.group_lock);
+ INIT_LIST_HEAD(&vfio.group_list);
+
+ ret = vfio_container_init();
+ if (ret)
+ return ret;
+
+ /* /dev/vfio/$GROUP */
+ vfio.class = class_create(THIS_MODULE, "vfio");
+ if (IS_ERR(vfio.class)) {
+ ret = PTR_ERR(vfio.class);
+ goto err_group_class;
+ }
+
+ vfio.class->devnode = vfio_devnode;
+
+ ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
+ if (ret)
+ goto err_alloc_chrdev;
+ return 0;
+
+err_alloc_chrdev:
+ class_destroy(vfio.class);
+ vfio.class = NULL;
+err_group_class:
+ vfio_container_cleanup();
+ return ret;
+}
+
+void vfio_group_cleanup(void)
+{
+ WARN_ON(!list_empty(&vfio.group_list));
+ ida_destroy(&vfio.group_ida);
+ unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
+ class_destroy(vfio.class);
+ vfio.class = NULL;
+ vfio_container_cleanup();
+}
#include <linux/cdev.h>
#include <linux/compat.h>
#include <linux/device.h>
-#include <linux/file.h>
-#include <linux/anon_inodes.h>
#include <linux/fs.h>
#include <linux/idr.h>
#include <linux/iommu.h>
#define DRIVER_DESC "VFIO - User Level meta-driver"
static struct vfio {
- struct class *class;
- struct list_head group_list;
- struct mutex group_lock; /* locks group_list */
- struct ida group_ida;
- dev_t group_devt;
struct class *device_class;
struct ida device_ida;
} vfio;
static DEFINE_XARRAY(vfio_device_set_xa);
-static const struct file_operations vfio_group_fops;
int vfio_assign_device_set(struct vfio_device *device, void *set_id)
{
}
EXPORT_SYMBOL_GPL(vfio_device_set_open_count);
-/*
- * Group objects - create, release, get, put, search
- */
-static struct vfio_group *
-vfio_group_find_from_iommu(struct iommu_group *iommu_group)
-{
- struct vfio_group *group;
-
- lockdep_assert_held(&vfio.group_lock);
-
- /*
- * group->iommu_group from the vfio.group_list cannot be NULL
- * under the vfio.group_lock.
- */
- list_for_each_entry(group, &vfio.group_list, vfio_next) {
- if (group->iommu_group == iommu_group)
- return group;
- }
- return NULL;
-}
-
-static void vfio_group_release(struct device *dev)
-{
- struct vfio_group *group = container_of(dev, struct vfio_group, dev);
-
- mutex_destroy(&group->device_lock);
- mutex_destroy(&group->group_lock);
- WARN_ON(group->iommu_group);
- ida_free(&vfio.group_ida, MINOR(group->dev.devt));
- kfree(group);
-}
-
-static struct vfio_group *vfio_group_alloc(struct iommu_group *iommu_group,
- enum vfio_group_type type)
-{
- struct vfio_group *group;
- int minor;
-
- group = kzalloc(sizeof(*group), GFP_KERNEL);
- if (!group)
- return ERR_PTR(-ENOMEM);
-
- minor = ida_alloc_max(&vfio.group_ida, MINORMASK, GFP_KERNEL);
- if (minor < 0) {
- kfree(group);
- return ERR_PTR(minor);
- }
-
- device_initialize(&group->dev);
- group->dev.devt = MKDEV(MAJOR(vfio.group_devt), minor);
- group->dev.class = vfio.class;
- group->dev.release = vfio_group_release;
- cdev_init(&group->cdev, &vfio_group_fops);
- group->cdev.owner = THIS_MODULE;
-
- refcount_set(&group->drivers, 1);
- mutex_init(&group->group_lock);
- INIT_LIST_HEAD(&group->device_list);
- mutex_init(&group->device_lock);
- group->iommu_group = iommu_group;
- /* put in vfio_group_release() */
- iommu_group_ref_get(iommu_group);
- group->type = type;
- BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
-
- return group;
-}
-
-static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
- enum vfio_group_type type)
-{
- struct vfio_group *group;
- struct vfio_group *ret;
- int err;
-
- lockdep_assert_held(&vfio.group_lock);
-
- group = vfio_group_alloc(iommu_group, type);
- if (IS_ERR(group))
- return group;
-
- err = dev_set_name(&group->dev, "%s%d",
- group->type == VFIO_NO_IOMMU ? "noiommu-" : "",
- iommu_group_id(iommu_group));
- if (err) {
- ret = ERR_PTR(err);
- goto err_put;
- }
-
- err = cdev_device_add(&group->cdev, &group->dev);
- if (err) {
- ret = ERR_PTR(err);
- goto err_put;
- }
-
- list_add(&group->vfio_next, &vfio.group_list);
-
- return group;
-
-err_put:
- put_device(&group->dev);
- return ret;
-}
-
-static void vfio_device_remove_group(struct vfio_device *device)
-{
- struct vfio_group *group = device->group;
- struct iommu_group *iommu_group;
-
- if (group->type == VFIO_NO_IOMMU || group->type == VFIO_EMULATED_IOMMU)
- iommu_group_remove_device(device->dev);
-
- /* Pairs with vfio_create_group() / vfio_group_get_from_iommu() */
- if (!refcount_dec_and_mutex_lock(&group->drivers, &vfio.group_lock))
- return;
- list_del(&group->vfio_next);
-
- /*
- * We could concurrently probe another driver in the group that might
- * race vfio_device_remove_group() with vfio_get_group(), so we have to
- * ensure that the sysfs is all cleaned up under lock otherwise the
- * cdev_device_add() will fail due to the name aready existing.
- */
- cdev_device_del(&group->cdev, &group->dev);
-
- mutex_lock(&group->group_lock);
- /*
- * These data structures all have paired operations that can only be
- * undone when the caller holds a live reference on the device. Since
- * all pairs must be undone these WARN_ON's indicate some caller did not
- * properly hold the group reference.
- */
- WARN_ON(!list_empty(&group->device_list));
- WARN_ON(group->notifier.head);
-
- /*
- * Revoke all users of group->iommu_group. At this point we know there
- * are no devices active because we are unplugging the last one. Setting
- * iommu_group to NULL blocks all new users.
- */
- if (group->container)
- vfio_group_detach_container(group);
- iommu_group = group->iommu_group;
- group->iommu_group = NULL;
- mutex_unlock(&group->group_lock);
- mutex_unlock(&vfio.group_lock);
-
- iommu_group_put(iommu_group);
- put_device(&group->dev);
-}
-
/*
* Device objects - create, release, get, put, search
*/
/* Device reference always implies a group reference */
-static void vfio_device_put_registration(struct vfio_device *device)
+void vfio_device_put_registration(struct vfio_device *device)
{
if (refcount_dec_and_test(&device->refcount))
complete(&device->comp);
}
-static bool vfio_device_try_get_registration(struct vfio_device *device)
+bool vfio_device_try_get_registration(struct vfio_device *device)
{
return refcount_inc_not_zero(&device->refcount);
}
}
EXPORT_SYMBOL_GPL(vfio_free_device);
-static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev,
- enum vfio_group_type type)
-{
- struct iommu_group *iommu_group;
- struct vfio_group *group;
- int ret;
-
- iommu_group = iommu_group_alloc();
- if (IS_ERR(iommu_group))
- return ERR_CAST(iommu_group);
-
- ret = iommu_group_set_name(iommu_group, "vfio-noiommu");
- if (ret)
- goto out_put_group;
- ret = iommu_group_add_device(iommu_group, dev);
- if (ret)
- goto out_put_group;
-
- mutex_lock(&vfio.group_lock);
- group = vfio_create_group(iommu_group, type);
- mutex_unlock(&vfio.group_lock);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto out_remove_device;
- }
- iommu_group_put(iommu_group);
- return group;
-
-out_remove_device:
- iommu_group_remove_device(dev);
-out_put_group:
- iommu_group_put(iommu_group);
- return ERR_PTR(ret);
-}
-
-static bool vfio_group_has_device(struct vfio_group *group, struct device *dev)
-{
- struct vfio_device *device;
-
- mutex_lock(&group->device_lock);
- list_for_each_entry(device, &group->device_list, group_next) {
- if (device->dev == dev) {
- mutex_unlock(&group->device_lock);
- return true;
- }
- }
- mutex_unlock(&group->device_lock);
- return false;
-}
-
-static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
-{
- struct iommu_group *iommu_group;
- struct vfio_group *group;
-
- iommu_group = iommu_group_get(dev);
- if (!iommu_group && vfio_noiommu) {
- /*
- * With noiommu enabled, create an IOMMU group for devices that
- * don't already have one, implying no IOMMU hardware/driver
- * exists. Taint the kernel because we're about to give a DMA
- * capable device to a user without IOMMU protection.
- */
- group = vfio_noiommu_group_alloc(dev, VFIO_NO_IOMMU);
- if (!IS_ERR(group)) {
- add_taint(TAINT_USER, LOCKDEP_STILL_OK);
- dev_warn(dev, "Adding kernel taint for vfio-noiommu group on device\n");
- }
- return group;
- }
-
- if (!iommu_group)
- return ERR_PTR(-EINVAL);
-
- /*
- * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
- * restore cache coherency. It has to be checked here because it is only
- * valid for cases where we are using iommu groups.
- */
- if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
- iommu_group_put(iommu_group);
- return ERR_PTR(-EINVAL);
- }
-
- mutex_lock(&vfio.group_lock);
- group = vfio_group_find_from_iommu(iommu_group);
- if (group) {
- if (WARN_ON(vfio_group_has_device(group, dev)))
- group = ERR_PTR(-EINVAL);
- else
- refcount_inc(&group->drivers);
- } else {
- group = vfio_create_group(iommu_group, VFIO_IOMMU);
- }
- mutex_unlock(&vfio.group_lock);
-
- /* The vfio_group holds a reference to the iommu_group */
- iommu_group_put(iommu_group);
- return group;
-}
-
-static void vfio_device_group_register(struct vfio_device *device)
-{
- mutex_lock(&device->group->device_lock);
- list_add(&device->group_next, &device->group->device_list);
- mutex_unlock(&device->group->device_lock);
-}
-
-static void vfio_device_group_unregister(struct vfio_device *device)
-{
- mutex_lock(&device->group->device_lock);
- list_del(&device->group_next);
- mutex_unlock(&device->group->device_lock);
-}
-
-static int vfio_device_set_group(struct vfio_device *device,
- enum vfio_group_type type)
-{
- struct vfio_group *group;
-
- if (type == VFIO_IOMMU)
- group = vfio_group_find_or_alloc(device->dev);
- else
- group = vfio_noiommu_group_alloc(device->dev, type);
-
- if (IS_ERR(group))
- return PTR_ERR(group);
-
- /* Our reference on group is moved to the device */
- device->group = group;
- return 0;
-}
-
static int __vfio_register_dev(struct vfio_device *device,
enum vfio_group_type type)
{
}
EXPORT_SYMBOL_GPL(vfio_register_emulated_iommu_dev);
-static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
- char *buf)
-{
- struct vfio_device *it, *device = ERR_PTR(-ENODEV);
-
- mutex_lock(&group->device_lock);
- list_for_each_entry(it, &group->device_list, group_next) {
- int ret;
-
- if (it->ops->match) {
- ret = it->ops->match(it, buf);
- if (ret < 0) {
- device = ERR_PTR(ret);
- break;
- }
- } else {
- ret = !strcmp(dev_name(it->dev), buf);
- }
-
- if (ret && vfio_device_try_get_registration(it)) {
- device = it;
- break;
- }
- }
- mutex_unlock(&group->device_lock);
-
- return device;
-}
-
/*
* Decrement the device reference count and wait for the device to be
* removed. Open file descriptors for the device... */
}
EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
-/*
- * VFIO Group fd, /dev/vfio/$GROUP
- */
-static bool vfio_group_has_iommu(struct vfio_group *group)
-{
- lockdep_assert_held(&group->group_lock);
- /*
- * There can only be users if there is a container, and if there is a
- * container there must be users.
- */
- WARN_ON(!group->container != !group->container_users);
-
- return group->container || group->iommufd;
-}
-
-/*
- * VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or
- * if there was no container to unset. Since the ioctl is called on
- * the group, we know that still exists, therefore the only valid
- * transition here is 1->0.
- */
-static int vfio_group_ioctl_unset_container(struct vfio_group *group)
-{
- int ret = 0;
-
- mutex_lock(&group->group_lock);
- if (!vfio_group_has_iommu(group)) {
- ret = -EINVAL;
- goto out_unlock;
- }
- if (group->container) {
- if (group->container_users != 1) {
- ret = -EBUSY;
- goto out_unlock;
- }
- vfio_group_detach_container(group);
- }
- if (group->iommufd) {
- iommufd_ctx_put(group->iommufd);
- group->iommufd = NULL;
- }
-
-out_unlock:
- mutex_unlock(&group->group_lock);
- return ret;
-}
-
-static int vfio_group_ioctl_set_container(struct vfio_group *group,
- int __user *arg)
-{
- struct vfio_container *container;
- struct iommufd_ctx *iommufd;
- struct fd f;
- int ret;
- int fd;
-
- if (get_user(fd, arg))
- return -EFAULT;
-
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
-
- mutex_lock(&group->group_lock);
- if (vfio_group_has_iommu(group)) {
- ret = -EINVAL;
- goto out_unlock;
- }
- if (!group->iommu_group) {
- ret = -ENODEV;
- goto out_unlock;
- }
-
- container = vfio_container_from_file(f.file);
- if (container) {
- ret = vfio_container_attach_group(container, group);
- goto out_unlock;
- }
-
- iommufd = iommufd_ctx_from_file(f.file);
- if (!IS_ERR(iommufd)) {
- u32 ioas_id;
-
- ret = iommufd_vfio_compat_ioas_id(iommufd, &ioas_id);
- if (ret) {
- iommufd_ctx_put(group->iommufd);
- goto out_unlock;
- }
-
- group->iommufd = iommufd;
- goto out_unlock;
- }
-
- /* The FD passed is not recognized. */
- ret = -EBADFD;
-
-out_unlock:
- mutex_unlock(&group->group_lock);
- fdput(f);
- return ret;
-}
-
-static const struct file_operations vfio_device_fops;
-
/* true if the vfio_device has open_device() called but not close_device() */
static bool vfio_assert_device_open(struct vfio_device *device)
{
return !WARN_ON_ONCE(!READ_ONCE(device->open_count));
}
-static int vfio_device_group_use_iommu(struct vfio_device *device)
-{
- struct vfio_group *group = device->group;
- int ret = 0;
-
- lockdep_assert_held(&group->group_lock);
-
- if (WARN_ON(!group->container))
- return -EINVAL;
-
- ret = vfio_group_use_container(group);
- if (ret)
- return ret;
- vfio_device_container_register(device);
- return 0;
-}
-
-static void vfio_device_group_unuse_iommu(struct vfio_device *device)
-{
- struct vfio_group *group = device->group;
-
- lockdep_assert_held(&group->group_lock);
-
- if (WARN_ON(!group->container))
- return;
-
- vfio_device_container_unregister(device);
- vfio_group_unuse_container(group);
-}
-
static int vfio_device_first_open(struct vfio_device *device,
struct iommufd_ctx *iommufd, struct kvm *kvm)
{
module_put(device->dev->driver->owner);
}
-static int vfio_device_open(struct vfio_device *device,
- struct iommufd_ctx *iommufd, struct kvm *kvm)
+int vfio_device_open(struct vfio_device *device,
+ struct iommufd_ctx *iommufd, struct kvm *kvm)
{
int ret = 0;
return ret;
}
-static void vfio_device_close(struct vfio_device *device,
- struct iommufd_ctx *iommufd)
+void vfio_device_close(struct vfio_device *device,
+ struct iommufd_ctx *iommufd)
{
mutex_lock(&device->dev_set->lock);
vfio_assert_device_open(device);
mutex_unlock(&device->dev_set->lock);
}
-static int vfio_device_group_open(struct vfio_device *device)
-{
- int ret;
-
- mutex_lock(&device->group->group_lock);
- if (!vfio_group_has_iommu(device->group)) {
- ret = -EINVAL;
- goto out_unlock;
- }
-
- /*
- * Here we pass the KVM pointer with the group under the lock. If the
- * device driver will use it, it must obtain a reference and release it
- * during close_device.
- */
- ret = vfio_device_open(device, device->group->iommufd,
- device->group->kvm);
-
-out_unlock:
- mutex_unlock(&device->group->group_lock);
- return ret;
-}
-
-static void vfio_device_group_close(struct vfio_device *device)
-{
- mutex_lock(&device->group->group_lock);
- vfio_device_close(device, device->group->iommufd);
- mutex_unlock(&device->group->group_lock);
-}
-
-static struct file *vfio_device_open_file(struct vfio_device *device)
-{
- struct file *filep;
- int ret;
-
- ret = vfio_device_group_open(device);
- if (ret)
- goto err_out;
-
- /*
- * We can't use anon_inode_getfd() because we need to modify
- * the f_mode flags directly to allow more than just ioctls
- */
- filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
- device, O_RDWR);
- if (IS_ERR(filep)) {
- ret = PTR_ERR(filep);
- goto err_close_device;
- }
-
- /*
- * TODO: add an anon_inode interface to do this.
- * Appears to be missing by lack of need rather than
- * explicitly prevented. Now there's need.
- */
- filep->f_mode |= (FMODE_PREAD | FMODE_PWRITE);
-
- if (device->group->type == VFIO_NO_IOMMU)
- dev_warn(device->dev, "vfio-noiommu device opened by user "
- "(%s:%d)\n", current->comm, task_pid_nr(current));
- /*
- * On success the ref of device is moved to the file and
- * put in vfio_device_fops_release()
- */
- return filep;
-
-err_close_device:
- vfio_device_group_close(device);
-err_out:
- return ERR_PTR(ret);
-}
-
-static int vfio_group_ioctl_get_device_fd(struct vfio_group *group,
- char __user *arg)
-{
- struct vfio_device *device;
- struct file *filep;
- char *buf;
- int fdno;
- int ret;
-
- buf = strndup_user(arg, PAGE_SIZE);
- if (IS_ERR(buf))
- return PTR_ERR(buf);
-
- device = vfio_device_get_from_name(group, buf);
- kfree(buf);
- if (IS_ERR(device))
- return PTR_ERR(device);
-
- fdno = get_unused_fd_flags(O_CLOEXEC);
- if (fdno < 0) {
- ret = fdno;
- goto err_put_device;
- }
-
- filep = vfio_device_open_file(device);
- if (IS_ERR(filep)) {
- ret = PTR_ERR(filep);
- goto err_put_fdno;
- }
-
- fd_install(fdno, filep);
- return fdno;
-
-err_put_fdno:
- put_unused_fd(fdno);
-err_put_device:
- vfio_device_put_registration(device);
- return ret;
-}
-
-static int vfio_group_ioctl_get_status(struct vfio_group *group,
- struct vfio_group_status __user *arg)
-{
- unsigned long minsz = offsetofend(struct vfio_group_status, flags);
- struct vfio_group_status status;
-
- if (copy_from_user(&status, arg, minsz))
- return -EFAULT;
-
- if (status.argsz < minsz)
- return -EINVAL;
-
- status.flags = 0;
-
- mutex_lock(&group->group_lock);
- if (!group->iommu_group) {
- mutex_unlock(&group->group_lock);
- return -ENODEV;
- }
-
- /*
- * With the container FD the iommu_group_claim_dma_owner() is done
- * during SET_CONTAINER but for IOMMFD this is done during
- * VFIO_GROUP_GET_DEVICE_FD. Meaning that with iommufd
- * VFIO_GROUP_FLAGS_VIABLE could be set but GET_DEVICE_FD will fail due
- * to viability.
- */
- if (vfio_group_has_iommu(group))
- status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET |
- VFIO_GROUP_FLAGS_VIABLE;
- else if (!iommu_group_dma_owner_claimed(group->iommu_group))
- status.flags |= VFIO_GROUP_FLAGS_VIABLE;
- mutex_unlock(&group->group_lock);
-
- if (copy_to_user(arg, &status, minsz))
- return -EFAULT;
- return 0;
-}
-
-static long vfio_group_fops_unl_ioctl(struct file *filep,
- unsigned int cmd, unsigned long arg)
-{
- struct vfio_group *group = filep->private_data;
- void __user *uarg = (void __user *)arg;
-
- switch (cmd) {
- case VFIO_GROUP_GET_DEVICE_FD:
- return vfio_group_ioctl_get_device_fd(group, uarg);
- case VFIO_GROUP_GET_STATUS:
- return vfio_group_ioctl_get_status(group, uarg);
- case VFIO_GROUP_SET_CONTAINER:
- return vfio_group_ioctl_set_container(group, uarg);
- case VFIO_GROUP_UNSET_CONTAINER:
- return vfio_group_ioctl_unset_container(group);
- default:
- return -ENOTTY;
- }
-}
-
-static int vfio_group_fops_open(struct inode *inode, struct file *filep)
-{
- struct vfio_group *group =
- container_of(inode->i_cdev, struct vfio_group, cdev);
- int ret;
-
- mutex_lock(&group->group_lock);
-
- /*
- * drivers can be zero if this races with vfio_device_remove_group(), it
- * will be stable at 0 under the group rwsem
- */
- if (refcount_read(&group->drivers) == 0) {
- ret = -ENODEV;
- goto out_unlock;
- }
-
- if (group->type == VFIO_NO_IOMMU && !capable(CAP_SYS_RAWIO)) {
- ret = -EPERM;
- goto out_unlock;
- }
-
- /*
- * Do we need multiple instances of the group open? Seems not.
- */
- if (group->opened_file) {
- ret = -EBUSY;
- goto out_unlock;
- }
- group->opened_file = filep;
- filep->private_data = group;
- ret = 0;
-out_unlock:
- mutex_unlock(&group->group_lock);
- return ret;
-}
-
-static int vfio_group_fops_release(struct inode *inode, struct file *filep)
-{
- struct vfio_group *group = filep->private_data;
-
- filep->private_data = NULL;
-
- mutex_lock(&group->group_lock);
- /*
- * Device FDs hold a group file reference, therefore the group release
- * is only called when there are no open devices.
- */
- WARN_ON(group->notifier.head);
- if (group->container)
- vfio_group_detach_container(group);
- if (group->iommufd) {
- iommufd_ctx_put(group->iommufd);
- group->iommufd = NULL;
- }
- group->opened_file = NULL;
- mutex_unlock(&group->group_lock);
- return 0;
-}
-
-static const struct file_operations vfio_group_fops = {
- .owner = THIS_MODULE,
- .unlocked_ioctl = vfio_group_fops_unl_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
- .open = vfio_group_fops_open,
- .release = vfio_group_fops_release,
-};
-
/*
* Wrapper around pm_runtime_resume_and_get().
* Return error code on failure or 0 on success.
return device->ops->mmap(device, vma);
}
-static const struct file_operations vfio_device_fops = {
+const struct file_operations vfio_device_fops = {
.owner = THIS_MODULE,
.release = vfio_device_fops_release,
.read = vfio_device_fops_read,
.mmap = vfio_device_fops_mmap,
};
-/**
- * vfio_file_iommu_group - Return the struct iommu_group for the vfio group file
- * @file: VFIO group file
- *
- * The returned iommu_group is valid as long as a ref is held on the file. This
- * returns a reference on the group. This function is deprecated, only the SPAPR
- * path in kvm should call it.
- */
-struct iommu_group *vfio_file_iommu_group(struct file *file)
-{
- struct vfio_group *group = file->private_data;
- struct iommu_group *iommu_group = NULL;
-
- if (!IS_ENABLED(CONFIG_SPAPR_TCE_IOMMU))
- return NULL;
-
- if (!vfio_file_is_group(file))
- return NULL;
-
- mutex_lock(&group->group_lock);
- if (group->iommu_group) {
- iommu_group = group->iommu_group;
- iommu_group_ref_get(iommu_group);
- }
- mutex_unlock(&group->group_lock);
- return iommu_group;
-}
-EXPORT_SYMBOL_GPL(vfio_file_iommu_group);
-
-/**
- * vfio_file_is_group - True if the file is usable with VFIO aPIS
- * @file: VFIO group file
- */
-bool vfio_file_is_group(struct file *file)
-{
- return file->f_op == &vfio_group_fops;
-}
-EXPORT_SYMBOL_GPL(vfio_file_is_group);
-
-/**
- * vfio_file_enforced_coherent - True if the DMA associated with the VFIO file
- * is always CPU cache coherent
- * @file: VFIO group file
- *
- * Enforced coherency means that the IOMMU ignores things like the PCIe no-snoop
- * bit in DMA transactions. A return of false indicates that the user has
- * rights to access additional instructions such as wbinvd on x86.
- */
-bool vfio_file_enforced_coherent(struct file *file)
-{
- struct vfio_group *group = file->private_data;
- struct vfio_device *device;
- bool ret = true;
-
- if (!vfio_file_is_group(file))
- return true;
-
- /*
- * If the device does not have IOMMU_CAP_ENFORCE_CACHE_COHERENCY then
- * any domain later attached to it will also not support it. If the cap
- * is set then the iommu_domain eventually attached to the device/group
- * must use a domain with enforce_cache_coherency().
- */
- mutex_lock(&group->device_lock);
- list_for_each_entry(device, &group->device_list, group_next) {
- if (!device_iommu_capable(device->dev,
- IOMMU_CAP_ENFORCE_CACHE_COHERENCY)) {
- ret = false;
- break;
- }
- }
- mutex_unlock(&group->device_lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
-
-/**
- * vfio_file_set_kvm - Link a kvm with VFIO drivers
- * @file: VFIO group file
- * @kvm: KVM to link
- *
- * When a VFIO device is first opened the KVM will be available in
- * device->kvm if one was associated with the group.
- */
-void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
-{
- struct vfio_group *group = file->private_data;
-
- if (!vfio_file_is_group(file))
- return;
-
- mutex_lock(&group->group_lock);
- group->kvm = kvm;
- mutex_unlock(&group->group_lock);
-}
-EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
-
-/**
- * vfio_file_has_dev - True if the VFIO file is a handle for device
- * @file: VFIO file to check
- * @device: Device that must be part of the file
- *
- * Returns true if given file has permission to manipulate the given device.
- */
-bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
-{
- struct vfio_group *group = file->private_data;
-
- if (!vfio_file_is_group(file))
- return false;
-
- return group == device->group;
-}
-EXPORT_SYMBOL_GPL(vfio_file_has_dev);
-
/*
* Sub-module support
*/
}
EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare);
-static bool vfio_device_has_container(struct vfio_device *device)
-{
- return device->group->container;
-}
-
/*
* Pin contiguous user pages and return their associated host pages for local
* domain only.
/*
* Module/class support
*/
-static char *vfio_devnode(struct device *dev, umode_t *mode)
-{
- return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
-}
-
-static int __init vfio_group_init(void)
-{
- int ret;
-
- ida_init(&vfio.group_ida);
- mutex_init(&vfio.group_lock);
- INIT_LIST_HEAD(&vfio.group_list);
-
- ret = vfio_container_init();
- if (ret)
- return ret;
-
- /* /dev/vfio/$GROUP */
- vfio.class = class_create(THIS_MODULE, "vfio");
- if (IS_ERR(vfio.class)) {
- ret = PTR_ERR(vfio.class);
- goto err_group_class;
- }
-
- vfio.class->devnode = vfio_devnode;
-
- ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
- if (ret)
- goto err_alloc_chrdev;
- return 0;
-
-err_alloc_chrdev:
- class_destroy(vfio.class);
- vfio.class = NULL;
-err_group_class:
- vfio_container_cleanup();
- return ret;
-}
-
-static void vfio_group_cleanup(void)
-{
- WARN_ON(!list_empty(&vfio.group_list));
- ida_destroy(&vfio.group_ida);
- unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
- class_destroy(vfio.class);
- vfio.class = NULL;
- vfio_container_cleanup();
-}
-
static int __init vfio_init(void)
{
int ret;
projects / linux.git / commitdiff