From 95099d4622f8cb224d94e314c7a8e0df60b13f87 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 08:38:01 +0000
Subject: [PATCH] enable docker ppp
---
kernel/drivers/vfio/vfio.c | 506 +++++++++++++++++++++++++++++++++++---------------------
1 files changed, 315 insertions(+), 191 deletions(-)
diff --git a/kernel/drivers/vfio/vfio.c b/kernel/drivers/vfio/vfio.c
index 7a386fb..90db9d6 100644
--- a/kernel/drivers/vfio/vfio.c
+++ b/kernel/drivers/vfio/vfio.c
@@ -1,12 +1,9 @@
+// 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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*
* Derived from original vfio:
* Copyright 2010 Cisco Systems, Inc. All rights reserved.
@@ -49,7 +46,6 @@
struct mutex group_lock;
struct cdev group_cdev;
dev_t group_devt;
- wait_queue_head_t release_q;
} vfio;
struct vfio_iommu_driver {
@@ -88,17 +84,9 @@
atomic_t opened;
wait_queue_head_t container_q;
bool noiommu;
+ unsigned int dev_counter;
struct kvm *kvm;
struct blocking_notifier_head notifier;
-};
-
-struct vfio_device {
- struct kref kref;
- struct device *dev;
- const struct vfio_device_ops *ops;
- struct vfio_group *group;
- struct list_head group_next;
- void *device_data;
};
#ifdef CONFIG_VFIO_NOIOMMU
@@ -534,65 +522,17 @@
/**
* Device objects - create, release, get, put, search
*/
-static
-struct vfio_device *vfio_group_create_device(struct vfio_group *group,
- struct device *dev,
- const struct vfio_device_ops *ops,
- void *device_data)
-{
- struct vfio_device *device;
-
- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device)
- return ERR_PTR(-ENOMEM);
-
- kref_init(&device->kref);
- device->dev = dev;
- device->group = group;
- device->ops = ops;
- device->device_data = device_data;
- dev_set_drvdata(dev, device);
-
- /* No need to get group_lock, caller has group reference */
- vfio_group_get(group);
-
- mutex_lock(&group->device_lock);
- list_add(&device->group_next, &group->device_list);
- mutex_unlock(&group->device_lock);
-
- return device;
-}
-
-static void vfio_device_release(struct kref *kref)
-{
- struct vfio_device *device = container_of(kref,
- struct vfio_device, kref);
- struct vfio_group *group = device->group;
-
- list_del(&device->group_next);
- mutex_unlock(&group->device_lock);
-
- dev_set_drvdata(device->dev, NULL);
-
- kfree(device);
-
- /* vfio_del_group_dev may be waiting for this device */
- wake_up(&vfio.release_q);
-}
-
/* Device reference always implies a group reference */
void vfio_device_put(struct vfio_device *device)
{
- struct vfio_group *group = device->group;
- kref_put_mutex(&device->kref, vfio_device_release, &group->device_lock);
- vfio_group_put(group);
+ if (refcount_dec_and_test(&device->refcount))
+ complete(&device->comp);
}
EXPORT_SYMBOL_GPL(vfio_device_put);
-static void vfio_device_get(struct vfio_device *device)
+static bool vfio_device_try_get(struct vfio_device *device)
{
- vfio_group_get(device->group);
- kref_get(&device->kref);
+ return refcount_inc_not_zero(&device->refcount);
}
static struct vfio_device *vfio_group_get_device(struct vfio_group *group,
@@ -602,8 +542,7 @@
mutex_lock(&group->device_lock);
list_for_each_entry(device, &group->device_list, group_next) {
- if (device->dev == dev) {
- vfio_device_get(device);
+ if (device->dev == dev && vfio_device_try_get(device)) {
mutex_unlock(&group->device_lock);
return device;
}
@@ -627,9 +566,10 @@
* that error notification via MSI can be affected for platforms that handle
* MSI within the same IOVA space as DMA.
*/
-static const char * const vfio_driver_whitelist[] = { "pci-stub" };
+static const char * const vfio_driver_allowed[] = { "pci-stub" };
-static bool vfio_dev_whitelisted(struct device *dev, struct device_driver *drv)
+static bool vfio_dev_driver_allowed(struct device *dev,
+ struct device_driver *drv)
{
if (dev_is_pci(dev)) {
struct pci_dev *pdev = to_pci_dev(dev);
@@ -638,8 +578,8 @@
return true;
}
- return match_string(vfio_driver_whitelist,
- ARRAY_SIZE(vfio_driver_whitelist),
+ return match_string(vfio_driver_allowed,
+ ARRAY_SIZE(vfio_driver_allowed),
drv->name) >= 0;
}
@@ -648,7 +588,7 @@
* one of the following states:
* - driver-less
* - bound to a vfio driver
- * - bound to a whitelisted driver
+ * - bound to an otherwise allowed driver
* - a PCI interconnect device
*
* We use two methods to determine whether a device is bound to a vfio
@@ -674,7 +614,7 @@
}
mutex_unlock(&group->unbound_lock);
- if (!ret || !drv || vfio_dev_whitelisted(dev, drv))
+ if (!ret || !drv || vfio_dev_driver_allowed(dev, drv))
return 0;
device = vfio_group_get_device(group, dev);
@@ -705,8 +645,8 @@
return 0;
/* TODO Prevent device auto probing */
- WARN(1, "Device %s added to live group %d!\n", dev_name(dev),
- iommu_group_id(group->iommu_group));
+ dev_WARN(dev, "Device added to live group %d!\n",
+ iommu_group_id(group->iommu_group));
return 0;
}
@@ -749,25 +689,22 @@
*/
break;
case IOMMU_GROUP_NOTIFY_BIND_DRIVER:
- pr_debug("%s: Device %s, group %d binding to driver\n",
- __func__, dev_name(dev),
- iommu_group_id(group->iommu_group));
+ dev_dbg(dev, "%s: group %d binding to driver\n", __func__,
+ iommu_group_id(group->iommu_group));
break;
case IOMMU_GROUP_NOTIFY_BOUND_DRIVER:
- pr_debug("%s: Device %s, group %d bound to driver %s\n",
- __func__, dev_name(dev),
- iommu_group_id(group->iommu_group), dev->driver->name);
+ dev_dbg(dev, "%s: group %d bound to driver %s\n", __func__,
+ iommu_group_id(group->iommu_group), dev->driver->name);
BUG_ON(vfio_group_nb_verify(group, dev));
break;
case IOMMU_GROUP_NOTIFY_UNBIND_DRIVER:
- pr_debug("%s: Device %s, group %d unbinding from driver %s\n",
- __func__, dev_name(dev),
- iommu_group_id(group->iommu_group), dev->driver->name);
+ dev_dbg(dev, "%s: group %d unbinding from driver %s\n",
+ __func__, iommu_group_id(group->iommu_group),
+ dev->driver->name);
break;
case IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER:
- pr_debug("%s: Device %s, group %d unbound from driver\n",
- __func__, dev_name(dev),
- iommu_group_id(group->iommu_group));
+ dev_dbg(dev, "%s: group %d unbound from driver\n", __func__,
+ iommu_group_id(group->iommu_group));
/*
* XXX An unbound device in a live group is ok, but we'd
* really like to avoid the above BUG_ON by preventing other
@@ -803,14 +740,23 @@
/**
* VFIO driver API
*/
-int vfio_add_group_dev(struct device *dev,
- const struct vfio_device_ops *ops, void *device_data)
+void vfio_init_group_dev(struct vfio_device *device, struct device *dev,
+ const struct vfio_device_ops *ops, void *device_data)
{
+ init_completion(&device->comp);
+ device->dev = dev;
+ device->ops = ops;
+ device->device_data = device_data;
+}
+EXPORT_SYMBOL_GPL(vfio_init_group_dev);
+
+int vfio_register_group_dev(struct vfio_device *device)
+{
+ struct vfio_device *existing_device;
struct iommu_group *iommu_group;
struct vfio_group *group;
- struct vfio_device *device;
- iommu_group = iommu_group_get(dev);
+ iommu_group = iommu_group_get(device->dev);
if (!iommu_group)
return -EINVAL;
@@ -829,29 +775,50 @@
iommu_group_put(iommu_group);
}
- device = vfio_group_get_device(group, dev);
- if (device) {
- WARN(1, "Device %s already exists on group %d\n",
- dev_name(dev), iommu_group_id(iommu_group));
- vfio_device_put(device);
+ existing_device = vfio_group_get_device(group, device->dev);
+ if (existing_device) {
+ dev_WARN(device->dev, "Device already exists on group %d\n",
+ iommu_group_id(iommu_group));
+ vfio_device_put(existing_device);
vfio_group_put(group);
return -EBUSY;
}
- device = vfio_group_create_device(group, dev, ops, device_data);
- if (IS_ERR(device)) {
- vfio_group_put(group);
- return PTR_ERR(device);
- }
+ /* Our reference on group is moved to the device */
+ device->group = group;
- /*
- * Drop all but the vfio_device reference. The vfio_device holds
- * a reference to the vfio_group, which holds a reference to the
- * iommu_group.
- */
- vfio_group_put(group);
+ /* Refcounting can't start until the driver calls register */
+ refcount_set(&device->refcount, 1);
+
+ mutex_lock(&group->device_lock);
+ list_add(&device->group_next, &group->device_list);
+ group->dev_counter++;
+ mutex_unlock(&group->device_lock);
return 0;
+}
+EXPORT_SYMBOL_GPL(vfio_register_group_dev);
+
+int vfio_add_group_dev(struct device *dev, const struct vfio_device_ops *ops,
+ void *device_data)
+{
+ struct vfio_device *device;
+ int ret;
+
+ device = kzalloc(sizeof(*device), GFP_KERNEL);
+ if (!device)
+ return -ENOMEM;
+
+ vfio_init_group_dev(device, dev, ops, device_data);
+ ret = vfio_register_group_dev(device);
+ if (ret)
+ goto err_kfree;
+ dev_set_drvdata(dev, device);
+ return 0;
+
+err_kfree:
+ kfree(device);
+ return ret;
}
EXPORT_SYMBOL_GPL(vfio_add_group_dev);
@@ -881,13 +848,24 @@
static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
char *buf)
{
- struct vfio_device *it, *device = NULL;
+ struct vfio_device *it, *device = ERR_PTR(-ENODEV);
mutex_lock(&group->device_lock);
list_for_each_entry(it, &group->device_list, group_next) {
- if (!strcmp(dev_name(it->dev), buf)) {
+ int ret;
+
+ if (it->ops->match) {
+ ret = it->ops->match(it->device_data, buf);
+ if (ret < 0) {
+ device = ERR_PTR(ret);
+ break;
+ }
+ } else {
+ ret = !strcmp(dev_name(it->dev), buf);
+ }
+
+ if (ret && vfio_device_try_get(it)) {
device = it;
- vfio_device_get(device);
break;
}
}
@@ -908,21 +886,13 @@
/*
* Decrement the device reference count and wait for the device to be
* removed. Open file descriptors for the device... */
-void *vfio_del_group_dev(struct device *dev)
+void vfio_unregister_group_dev(struct vfio_device *device)
{
- DEFINE_WAIT_FUNC(wait, woken_wake_function);
- struct vfio_device *device = dev_get_drvdata(dev);
struct vfio_group *group = device->group;
- void *device_data = device->device_data;
struct vfio_unbound_dev *unbound;
unsigned int i = 0;
bool interrupted = false;
-
- /*
- * The group exists so long as we have a device reference. Get
- * a group reference and use it to scan for the device going away.
- */
- vfio_group_get(group);
+ long rc;
/*
* When the device is removed from the group, the group suddenly
@@ -935,7 +905,7 @@
*/
unbound = kzalloc(sizeof(*unbound), GFP_KERNEL);
if (unbound) {
- unbound->dev = dev;
+ unbound->dev = device->dev;
mutex_lock(&group->unbound_lock);
list_add(&unbound->unbound_next, &group->unbound_list);
mutex_unlock(&group->unbound_lock);
@@ -943,44 +913,33 @@
WARN_ON(!unbound);
vfio_device_put(device);
-
- /*
- * If the device is still present in the group after the above
- * 'put', then it is in use and we need to request it from the
- * bus driver. The driver may in turn need to request the
- * device from the user. We send the request on an arbitrary
- * interval with counter to allow the driver to take escalating
- * measures to release the device if it has the ability to do so.
- */
- add_wait_queue(&vfio.release_q, &wait);
-
- do {
- device = vfio_group_get_device(group, dev);
- if (!device)
- break;
-
+ rc = try_wait_for_completion(&device->comp);
+ while (rc <= 0) {
if (device->ops->request)
- device->ops->request(device_data, i++);
-
- vfio_device_put(device);
+ device->ops->request(device->device_data, i++);
if (interrupted) {
- wait_woken(&wait, TASK_UNINTERRUPTIBLE, HZ * 10);
+ rc = wait_for_completion_timeout(&device->comp,
+ HZ * 10);
} else {
- wait_woken(&wait, TASK_INTERRUPTIBLE, HZ * 10);
- if (signal_pending(current)) {
+ rc = wait_for_completion_interruptible_timeout(
+ &device->comp, HZ * 10);
+ if (rc < 0) {
interrupted = true;
- dev_warn(dev,
+ dev_warn(device->dev,
"Device is currently in use, task"
" \"%s\" (%d) "
"blocked until device is released",
current->comm, task_pid_nr(current));
}
}
+ }
- } while (1);
+ mutex_lock(&group->device_lock);
+ list_del(&device->group_next);
+ group->dev_counter--;
+ mutex_unlock(&group->device_lock);
- remove_wait_queue(&vfio.release_q, &wait);
/*
* In order to support multiple devices per group, devices can be
* plucked from the group while other devices in the group are still
@@ -998,8 +957,19 @@
if (list_empty(&group->device_list))
wait_event(group->container_q, !group->container);
+ /* Matches the get in vfio_register_group_dev() */
vfio_group_put(group);
+}
+EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
+void *vfio_del_group_dev(struct device *dev)
+{
+ struct vfio_device *device = dev_get_drvdata(dev);
+ void *device_data = device->device_data;
+
+ vfio_unregister_group_dev(device);
+ dev_set_drvdata(dev, NULL);
+ kfree(device);
return device_data;
}
EXPORT_SYMBOL_GPL(vfio_del_group_dev);
@@ -1190,15 +1160,6 @@
return ret;
}
-#ifdef CONFIG_COMPAT
-static long vfio_fops_compat_ioctl(struct file *filep,
- unsigned int cmd, unsigned long arg)
-{
- arg = (unsigned long)compat_ptr(arg);
- return vfio_fops_unl_ioctl(filep, cmd, arg);
-}
-#endif /* CONFIG_COMPAT */
-
static int vfio_fops_open(struct inode *inode, struct file *filep)
{
struct vfio_container *container;
@@ -1281,9 +1242,7 @@
.read = vfio_fops_read,
.write = vfio_fops_write,
.unlocked_ioctl = vfio_fops_unl_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = vfio_fops_compat_ioctl,
-#endif
+ .compat_ioctl = compat_ptr_ioctl,
.mmap = vfio_fops_mmap,
};
@@ -1447,8 +1406,8 @@
return -EPERM;
device = vfio_device_get_from_name(group, buf);
- if (!device)
- return -ENODEV;
+ if (IS_ERR(device))
+ return PTR_ERR(device);
ret = device->ops->open(device->device_data);
if (ret) {
@@ -1562,15 +1521,6 @@
return ret;
}
-#ifdef CONFIG_COMPAT
-static long vfio_group_fops_compat_ioctl(struct file *filep,
- unsigned int cmd, unsigned long arg)
-{
- arg = (unsigned long)compat_ptr(arg);
- return vfio_group_fops_unl_ioctl(filep, cmd, arg);
-}
-#endif /* CONFIG_COMPAT */
-
static int vfio_group_fops_open(struct inode *inode, struct file *filep)
{
struct vfio_group *group;
@@ -1626,9 +1576,7 @@
static const struct file_operations vfio_group_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = vfio_group_fops_unl_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = vfio_group_fops_compat_ioctl,
-#endif
+ .compat_ioctl = compat_ptr_ioctl,
.open = vfio_group_fops_open,
.release = vfio_group_fops_release,
};
@@ -1693,24 +1641,13 @@
return device->ops->mmap(device->device_data, vma);
}
-#ifdef CONFIG_COMPAT
-static long vfio_device_fops_compat_ioctl(struct file *filep,
- unsigned int cmd, unsigned long arg)
-{
- arg = (unsigned long)compat_ptr(arg);
- return vfio_device_fops_unl_ioctl(filep, cmd, arg);
-}
-#endif /* CONFIG_COMPAT */
-
static const struct file_operations vfio_device_fops = {
.owner = THIS_MODULE,
.release = vfio_device_fops_release,
.read = vfio_device_fops_read,
.write = vfio_device_fops_write,
.unlocked_ioctl = vfio_device_fops_unl_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = vfio_device_fops_compat_ioctl,
-#endif
+ .compat_ioctl = compat_ptr_ioctl,
.mmap = vfio_device_fops_mmap,
};
@@ -1758,6 +1695,44 @@
return group;
}
EXPORT_SYMBOL_GPL(vfio_group_get_external_user);
+
+/**
+ * External user API, exported by symbols to be linked dynamically.
+ * The external user passes in a device pointer
+ * to verify that:
+ * - A VFIO group is assiciated with the device;
+ * - IOMMU is set for the group.
+ * If both checks passed, vfio_group_get_external_user_from_dev()
+ * increments the container user counter to prevent the VFIO group
+ * from disposal before external user exits and returns the pointer
+ * to the VFIO group.
+ *
+ * When the external user finishes using the VFIO group, it calls
+ * vfio_group_put_external_user() to release the VFIO group and
+ * decrement the container user counter.
+ *
+ * @dev [in] : device
+ * Return error PTR or pointer to VFIO group.
+ */
+
+struct vfio_group *vfio_group_get_external_user_from_dev(struct device *dev)
+{
+ struct vfio_group *group;
+ int ret;
+
+ group = vfio_group_get_from_dev(dev);
+ if (!group)
+ return ERR_PTR(-ENODEV);
+
+ ret = vfio_group_add_container_user(group);
+ if (ret) {
+ vfio_group_put(group);
+ return ERR_PTR(ret);
+ }
+
+ return group;
+}
+EXPORT_SYMBOL_GPL(vfio_group_get_external_user_from_dev);
void vfio_group_put_external_user(struct vfio_group *group)
{
@@ -1808,6 +1783,7 @@
buf = krealloc(caps->buf, caps->size + size, GFP_KERNEL);
if (!buf) {
kfree(caps->buf);
+ caps->buf = NULL;
caps->size = 0;
return ERR_PTR(-ENOMEM);
}
@@ -1934,6 +1910,11 @@
if (!group)
return -ENODEV;
+ if (group->dev_counter > 1) {
+ ret = -EINVAL;
+ goto err_pin_pages;
+ }
+
ret = vfio_group_add_container_user(group);
if (ret)
goto err_pin_pages;
@@ -1941,7 +1922,8 @@
container = group->container;
driver = container->iommu_driver;
if (likely(driver && driver->ops->pin_pages))
- ret = driver->ops->pin_pages(container->iommu_data, user_pfn,
+ ret = driver->ops->pin_pages(container->iommu_data,
+ group->iommu_group, user_pfn,
npage, prot, phys_pfn);
else
ret = -ENOTTY;
@@ -1999,6 +1981,149 @@
return ret;
}
EXPORT_SYMBOL(vfio_unpin_pages);
+
+/*
+ * Pin a set of guest IOVA PFNs and return their associated host PFNs for a
+ * VFIO group.
+ *
+ * The caller needs to call vfio_group_get_external_user() or
+ * vfio_group_get_external_user_from_dev() prior to calling this interface,
+ * so as to prevent the VFIO group from disposal in the middle of the call.
+ * But it can keep the reference to the VFIO group for several calls into
+ * this interface.
+ * After finishing using of the VFIO group, the caller needs to release the
+ * VFIO group by calling vfio_group_put_external_user().
+ *
+ * @group [in] : VFIO group
+ * @user_iova_pfn [in] : array of user/guest IOVA PFNs to be pinned.
+ * @npage [in] : count of elements in user_iova_pfn array.
+ * This count should not be greater
+ * VFIO_PIN_PAGES_MAX_ENTRIES.
+ * @prot [in] : protection flags
+ * @phys_pfn [out] : array of host PFNs
+ * Return error or number of pages pinned.
+ */
+int vfio_group_pin_pages(struct vfio_group *group,
+ unsigned long *user_iova_pfn, int npage,
+ int prot, unsigned long *phys_pfn)
+{
+ struct vfio_container *container;
+ struct vfio_iommu_driver *driver;
+ int ret;
+
+ if (!group || !user_iova_pfn || !phys_pfn || !npage)
+ return -EINVAL;
+
+ if (group->dev_counter > 1)
+ return -EINVAL;
+
+ if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
+ return -E2BIG;
+
+ container = group->container;
+ driver = container->iommu_driver;
+ if (likely(driver && driver->ops->pin_pages))
+ ret = driver->ops->pin_pages(container->iommu_data,
+ group->iommu_group, user_iova_pfn,
+ npage, prot, phys_pfn);
+ else
+ ret = -ENOTTY;
+
+ return ret;
+}
+EXPORT_SYMBOL(vfio_group_pin_pages);
+
+/*
+ * Unpin a set of guest IOVA PFNs for a VFIO group.
+ *
+ * The caller needs to call vfio_group_get_external_user() or
+ * vfio_group_get_external_user_from_dev() prior to calling this interface,
+ * so as to prevent the VFIO group from disposal in the middle of the call.
+ * But it can keep the reference to the VFIO group for several calls into
+ * this interface.
+ * After finishing using of the VFIO group, the caller needs to release the
+ * VFIO group by calling vfio_group_put_external_user().
+ *
+ * @group [in] : vfio group
+ * @user_iova_pfn [in] : array of user/guest IOVA PFNs to be unpinned.
+ * @npage [in] : count of elements in user_iova_pfn array.
+ * This count should not be greater than
+ * VFIO_PIN_PAGES_MAX_ENTRIES.
+ * Return error or number of pages unpinned.
+ */
+int vfio_group_unpin_pages(struct vfio_group *group,
+ unsigned long *user_iova_pfn, int npage)
+{
+ struct vfio_container *container;
+ struct vfio_iommu_driver *driver;
+ int ret;
+
+ if (!group || !user_iova_pfn || !npage)
+ return -EINVAL;
+
+ if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
+ return -E2BIG;
+
+ container = group->container;
+ driver = container->iommu_driver;
+ if (likely(driver && driver->ops->unpin_pages))
+ ret = driver->ops->unpin_pages(container->iommu_data,
+ user_iova_pfn, npage);
+ else
+ ret = -ENOTTY;
+
+ return ret;
+}
+EXPORT_SYMBOL(vfio_group_unpin_pages);
+
+
+/*
+ * This interface allows the CPUs to perform some sort of virtual DMA on
+ * behalf of the device.
+ *
+ * CPUs read/write from/into a range of IOVAs pointing to user space memory
+ * into/from a kernel buffer.
+ *
+ * As the read/write of user space memory is conducted via the CPUs and is
+ * not a real device DMA, it is not necessary to pin the user space memory.
+ *
+ * The caller needs to call vfio_group_get_external_user() or
+ * vfio_group_get_external_user_from_dev() prior to calling this interface,
+ * so as to prevent the VFIO group from disposal in the middle of the call.
+ * But it can keep the reference to the VFIO group for several calls into
+ * this interface.
+ * After finishing using of the VFIO group, the caller needs to release the
+ * VFIO group by calling vfio_group_put_external_user().
+ *
+ * @group [in] : VFIO group
+ * @user_iova [in] : base IOVA of a user space buffer
+ * @data [in] : pointer to kernel buffer
+ * @len [in] : kernel buffer length
+ * @write : indicate read or write
+ * Return error code on failure or 0 on success.
+ */
+int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova,
+ void *data, size_t len, bool write)
+{
+ struct vfio_container *container;
+ struct vfio_iommu_driver *driver;
+ int ret = 0;
+
+ if (!group || !data || len <= 0)
+ return -EINVAL;
+
+ container = group->container;
+ driver = container->iommu_driver;
+
+ if (likely(driver && driver->ops->dma_rw))
+ ret = driver->ops->dma_rw(container->iommu_data,
+ user_iova, data, len, write);
+ else
+ ret = -ENOTTY;
+
+ return ret;
+}
+EXPORT_SYMBOL(vfio_dma_rw);
static int vfio_register_iommu_notifier(struct vfio_group *group,
unsigned long *events,
@@ -2192,7 +2317,6 @@
mutex_init(&vfio.iommu_drivers_lock);
INIT_LIST_HEAD(&vfio.group_list);
INIT_LIST_HEAD(&vfio.iommu_drivers_list);
- init_waitqueue_head(&vfio.release_q);
ret = misc_register(&vfio_dev);
if (ret) {
@@ -2209,12 +2333,12 @@
vfio.class->devnode = vfio_devnode;
- ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK, "vfio");
+ ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
if (ret)
goto err_alloc_chrdev;
cdev_init(&vfio.group_cdev, &vfio_group_fops);
- ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK);
+ ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK + 1);
if (ret)
goto err_cdev_add;
@@ -2226,7 +2350,7 @@
return 0;
err_cdev_add:
- unregister_chrdev_region(vfio.group_devt, MINORMASK);
+ unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
err_alloc_chrdev:
class_destroy(vfio.class);
vfio.class = NULL;
@@ -2244,7 +2368,7 @@
#endif
idr_destroy(&vfio.group_idr);
cdev_del(&vfio.group_cdev);
- unregister_chrdev_region(vfio.group_devt, MINORMASK);
+ unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
class_destroy(vfio.class);
vfio.class = NULL;
misc_deregister(&vfio_dev);
--
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