mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Joe Perches](/assets/img/avatar_default.png)
printk supports using %pa for phys_addr_t and %zx for size_t so use those instead of %lx and casts to unsigned long. Other miscellaneous changes around this: Always use 0x%zx for size instead of one use of decimal. Coalesce format and align arguments. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
984 lines
25 KiB
C
984 lines
25 KiB
C
/*
|
|
* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
|
|
* Author: Joerg Roedel <joerg.roedel@amd.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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/iommu.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/err.h>
|
|
|
|
static struct kset *iommu_group_kset;
|
|
static struct ida iommu_group_ida;
|
|
static struct mutex iommu_group_mutex;
|
|
|
|
struct iommu_group {
|
|
struct kobject kobj;
|
|
struct kobject *devices_kobj;
|
|
struct list_head devices;
|
|
struct mutex mutex;
|
|
struct blocking_notifier_head notifier;
|
|
void *iommu_data;
|
|
void (*iommu_data_release)(void *iommu_data);
|
|
char *name;
|
|
int id;
|
|
};
|
|
|
|
struct iommu_device {
|
|
struct list_head list;
|
|
struct device *dev;
|
|
char *name;
|
|
};
|
|
|
|
struct iommu_group_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct iommu_group *group, char *buf);
|
|
ssize_t (*store)(struct iommu_group *group,
|
|
const char *buf, size_t count);
|
|
};
|
|
|
|
#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
|
|
struct iommu_group_attribute iommu_group_attr_##_name = \
|
|
__ATTR(_name, _mode, _show, _store)
|
|
|
|
#define to_iommu_group_attr(_attr) \
|
|
container_of(_attr, struct iommu_group_attribute, attr)
|
|
#define to_iommu_group(_kobj) \
|
|
container_of(_kobj, struct iommu_group, kobj)
|
|
|
|
static ssize_t iommu_group_attr_show(struct kobject *kobj,
|
|
struct attribute *__attr, char *buf)
|
|
{
|
|
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
ssize_t ret = -EIO;
|
|
|
|
if (attr->show)
|
|
ret = attr->show(group, buf);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t iommu_group_attr_store(struct kobject *kobj,
|
|
struct attribute *__attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
ssize_t ret = -EIO;
|
|
|
|
if (attr->store)
|
|
ret = attr->store(group, buf, count);
|
|
return ret;
|
|
}
|
|
|
|
static const struct sysfs_ops iommu_group_sysfs_ops = {
|
|
.show = iommu_group_attr_show,
|
|
.store = iommu_group_attr_store,
|
|
};
|
|
|
|
static int iommu_group_create_file(struct iommu_group *group,
|
|
struct iommu_group_attribute *attr)
|
|
{
|
|
return sysfs_create_file(&group->kobj, &attr->attr);
|
|
}
|
|
|
|
static void iommu_group_remove_file(struct iommu_group *group,
|
|
struct iommu_group_attribute *attr)
|
|
{
|
|
sysfs_remove_file(&group->kobj, &attr->attr);
|
|
}
|
|
|
|
static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", group->name);
|
|
}
|
|
|
|
static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
|
|
|
|
static void iommu_group_release(struct kobject *kobj)
|
|
{
|
|
struct iommu_group *group = to_iommu_group(kobj);
|
|
|
|
if (group->iommu_data_release)
|
|
group->iommu_data_release(group->iommu_data);
|
|
|
|
mutex_lock(&iommu_group_mutex);
|
|
ida_remove(&iommu_group_ida, group->id);
|
|
mutex_unlock(&iommu_group_mutex);
|
|
|
|
kfree(group->name);
|
|
kfree(group);
|
|
}
|
|
|
|
static struct kobj_type iommu_group_ktype = {
|
|
.sysfs_ops = &iommu_group_sysfs_ops,
|
|
.release = iommu_group_release,
|
|
};
|
|
|
|
/**
|
|
* iommu_group_alloc - Allocate a new group
|
|
* @name: Optional name to associate with group, visible in sysfs
|
|
*
|
|
* This function is called by an iommu driver to allocate a new iommu
|
|
* group. The iommu group represents the minimum granularity of the iommu.
|
|
* Upon successful return, the caller holds a reference to the supplied
|
|
* group in order to hold the group until devices are added. Use
|
|
* iommu_group_put() to release this extra reference count, allowing the
|
|
* group to be automatically reclaimed once it has no devices or external
|
|
* references.
|
|
*/
|
|
struct iommu_group *iommu_group_alloc(void)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = kzalloc(sizeof(*group), GFP_KERNEL);
|
|
if (!group)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
group->kobj.kset = iommu_group_kset;
|
|
mutex_init(&group->mutex);
|
|
INIT_LIST_HEAD(&group->devices);
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
|
|
|
|
mutex_lock(&iommu_group_mutex);
|
|
|
|
again:
|
|
if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) {
|
|
kfree(group);
|
|
mutex_unlock(&iommu_group_mutex);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id))
|
|
goto again;
|
|
|
|
mutex_unlock(&iommu_group_mutex);
|
|
|
|
ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
|
|
NULL, "%d", group->id);
|
|
if (ret) {
|
|
mutex_lock(&iommu_group_mutex);
|
|
ida_remove(&iommu_group_ida, group->id);
|
|
mutex_unlock(&iommu_group_mutex);
|
|
kfree(group);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
|
|
if (!group->devices_kobj) {
|
|
kobject_put(&group->kobj); /* triggers .release & free */
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* The devices_kobj holds a reference on the group kobject, so
|
|
* as long as that exists so will the group. We can therefore
|
|
* use the devices_kobj for reference counting.
|
|
*/
|
|
kobject_put(&group->kobj);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_alloc);
|
|
|
|
struct iommu_group *iommu_group_get_by_id(int id)
|
|
{
|
|
struct kobject *group_kobj;
|
|
struct iommu_group *group;
|
|
const char *name;
|
|
|
|
if (!iommu_group_kset)
|
|
return NULL;
|
|
|
|
name = kasprintf(GFP_KERNEL, "%d", id);
|
|
if (!name)
|
|
return NULL;
|
|
|
|
group_kobj = kset_find_obj(iommu_group_kset, name);
|
|
kfree(name);
|
|
|
|
if (!group_kobj)
|
|
return NULL;
|
|
|
|
group = container_of(group_kobj, struct iommu_group, kobj);
|
|
BUG_ON(group->id != id);
|
|
|
|
kobject_get(group->devices_kobj);
|
|
kobject_put(&group->kobj);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
|
|
|
|
/**
|
|
* iommu_group_get_iommudata - retrieve iommu_data registered for a group
|
|
* @group: the group
|
|
*
|
|
* iommu drivers can store data in the group for use when doing iommu
|
|
* operations. This function provides a way to retrieve it. Caller
|
|
* should hold a group reference.
|
|
*/
|
|
void *iommu_group_get_iommudata(struct iommu_group *group)
|
|
{
|
|
return group->iommu_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
|
|
|
|
/**
|
|
* iommu_group_set_iommudata - set iommu_data for a group
|
|
* @group: the group
|
|
* @iommu_data: new data
|
|
* @release: release function for iommu_data
|
|
*
|
|
* iommu drivers can store data in the group for use when doing iommu
|
|
* operations. This function provides a way to set the data after
|
|
* the group has been allocated. Caller should hold a group reference.
|
|
*/
|
|
void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
|
|
void (*release)(void *iommu_data))
|
|
{
|
|
group->iommu_data = iommu_data;
|
|
group->iommu_data_release = release;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
|
|
|
|
/**
|
|
* iommu_group_set_name - set name for a group
|
|
* @group: the group
|
|
* @name: name
|
|
*
|
|
* Allow iommu driver to set a name for a group. When set it will
|
|
* appear in a name attribute file under the group in sysfs.
|
|
*/
|
|
int iommu_group_set_name(struct iommu_group *group, const char *name)
|
|
{
|
|
int ret;
|
|
|
|
if (group->name) {
|
|
iommu_group_remove_file(group, &iommu_group_attr_name);
|
|
kfree(group->name);
|
|
group->name = NULL;
|
|
if (!name)
|
|
return 0;
|
|
}
|
|
|
|
group->name = kstrdup(name, GFP_KERNEL);
|
|
if (!group->name)
|
|
return -ENOMEM;
|
|
|
|
ret = iommu_group_create_file(group, &iommu_group_attr_name);
|
|
if (ret) {
|
|
kfree(group->name);
|
|
group->name = NULL;
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_set_name);
|
|
|
|
/**
|
|
* iommu_group_add_device - add a device to an iommu group
|
|
* @group: the group into which to add the device (reference should be held)
|
|
* @dev: the device
|
|
*
|
|
* This function is called by an iommu driver to add a device into a
|
|
* group. Adding a device increments the group reference count.
|
|
*/
|
|
int iommu_group_add_device(struct iommu_group *group, struct device *dev)
|
|
{
|
|
int ret, i = 0;
|
|
struct iommu_device *device;
|
|
|
|
device = kzalloc(sizeof(*device), GFP_KERNEL);
|
|
if (!device)
|
|
return -ENOMEM;
|
|
|
|
device->dev = dev;
|
|
|
|
ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
|
|
if (ret) {
|
|
kfree(device);
|
|
return ret;
|
|
}
|
|
|
|
device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
|
|
rename:
|
|
if (!device->name) {
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
kfree(device);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = sysfs_create_link_nowarn(group->devices_kobj,
|
|
&dev->kobj, device->name);
|
|
if (ret) {
|
|
kfree(device->name);
|
|
if (ret == -EEXIST && i >= 0) {
|
|
/*
|
|
* Account for the slim chance of collision
|
|
* and append an instance to the name.
|
|
*/
|
|
device->name = kasprintf(GFP_KERNEL, "%s.%d",
|
|
kobject_name(&dev->kobj), i++);
|
|
goto rename;
|
|
}
|
|
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
kfree(device);
|
|
return ret;
|
|
}
|
|
|
|
kobject_get(group->devices_kobj);
|
|
|
|
dev->iommu_group = group;
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_add_tail(&device->list, &group->devices);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
/* Notify any listeners about change to group. */
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_add_device);
|
|
|
|
/**
|
|
* iommu_group_remove_device - remove a device from it's current group
|
|
* @dev: device to be removed
|
|
*
|
|
* This function is called by an iommu driver to remove the device from
|
|
* it's current group. This decrements the iommu group reference count.
|
|
*/
|
|
void iommu_group_remove_device(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
struct iommu_device *tmp_device, *device = NULL;
|
|
|
|
/* Pre-notify listeners that a device is being removed. */
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_for_each_entry(tmp_device, &group->devices, list) {
|
|
if (tmp_device->dev == dev) {
|
|
device = tmp_device;
|
|
list_del(&device->list);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
|
|
if (!device)
|
|
return;
|
|
|
|
sysfs_remove_link(group->devices_kobj, device->name);
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
|
|
kfree(device->name);
|
|
kfree(device);
|
|
dev->iommu_group = NULL;
|
|
kobject_put(group->devices_kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
|
|
|
|
/**
|
|
* iommu_group_for_each_dev - iterate over each device in the group
|
|
* @group: the group
|
|
* @data: caller opaque data to be passed to callback function
|
|
* @fn: caller supplied callback function
|
|
*
|
|
* This function is called by group users to iterate over group devices.
|
|
* Callers should hold a reference count to the group during callback.
|
|
* The group->mutex is held across callbacks, which will block calls to
|
|
* iommu_group_add/remove_device.
|
|
*/
|
|
int iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
struct iommu_device *device;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_for_each_entry(device, &group->devices, list) {
|
|
ret = fn(device->dev, data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&group->mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
|
|
|
|
/**
|
|
* iommu_group_get - Return the group for a device and increment reference
|
|
* @dev: get the group that this device belongs to
|
|
*
|
|
* This function is called by iommu drivers and users to get the group
|
|
* for the specified device. If found, the group is returned and the group
|
|
* reference in incremented, else NULL.
|
|
*/
|
|
struct iommu_group *iommu_group_get(struct device *dev)
|
|
{
|
|
struct iommu_group *group = dev->iommu_group;
|
|
|
|
if (group)
|
|
kobject_get(group->devices_kobj);
|
|
|
|
return group;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_get);
|
|
|
|
/**
|
|
* iommu_group_put - Decrement group reference
|
|
* @group: the group to use
|
|
*
|
|
* This function is called by iommu drivers and users to release the
|
|
* iommu group. Once the reference count is zero, the group is released.
|
|
*/
|
|
void iommu_group_put(struct iommu_group *group)
|
|
{
|
|
if (group)
|
|
kobject_put(group->devices_kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_put);
|
|
|
|
/**
|
|
* iommu_group_register_notifier - Register a notifier for group changes
|
|
* @group: the group to watch
|
|
* @nb: notifier block to signal
|
|
*
|
|
* This function allows iommu group users to track changes in a group.
|
|
* See include/linux/iommu.h for actions sent via this notifier. Caller
|
|
* should hold a reference to the group throughout notifier registration.
|
|
*/
|
|
int iommu_group_register_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&group->notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
|
|
|
|
/**
|
|
* iommu_group_unregister_notifier - Unregister a notifier
|
|
* @group: the group to watch
|
|
* @nb: notifier block to signal
|
|
*
|
|
* Unregister a previously registered group notifier block.
|
|
*/
|
|
int iommu_group_unregister_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&group->notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
|
|
|
|
/**
|
|
* iommu_group_id - Return ID for a group
|
|
* @group: the group to ID
|
|
*
|
|
* Return the unique ID for the group matching the sysfs group number.
|
|
*/
|
|
int iommu_group_id(struct iommu_group *group)
|
|
{
|
|
return group->id;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_id);
|
|
|
|
static int add_iommu_group(struct device *dev, void *data)
|
|
{
|
|
struct iommu_ops *ops = data;
|
|
|
|
if (!ops->add_device)
|
|
return -ENODEV;
|
|
|
|
WARN_ON(dev->iommu_group);
|
|
|
|
ops->add_device(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_bus_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
struct iommu_group *group;
|
|
unsigned long group_action = 0;
|
|
|
|
/*
|
|
* ADD/DEL call into iommu driver ops if provided, which may
|
|
* result in ADD/DEL notifiers to group->notifier
|
|
*/
|
|
if (action == BUS_NOTIFY_ADD_DEVICE) {
|
|
if (ops->add_device)
|
|
return ops->add_device(dev);
|
|
} else if (action == BUS_NOTIFY_DEL_DEVICE) {
|
|
if (ops->remove_device && dev->iommu_group) {
|
|
ops->remove_device(dev);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remaining BUS_NOTIFYs get filtered and republished to the
|
|
* group, if anyone is listening
|
|
*/
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return 0;
|
|
|
|
switch (action) {
|
|
case BUS_NOTIFY_BIND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_BOUND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_UNBIND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
|
|
break;
|
|
case BUS_NOTIFY_UNBOUND_DRIVER:
|
|
group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
|
|
break;
|
|
}
|
|
|
|
if (group_action)
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
group_action, dev);
|
|
|
|
iommu_group_put(group);
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block iommu_bus_nb = {
|
|
.notifier_call = iommu_bus_notifier,
|
|
};
|
|
|
|
static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
|
|
{
|
|
bus_register_notifier(bus, &iommu_bus_nb);
|
|
bus_for_each_dev(bus, NULL, ops, add_iommu_group);
|
|
}
|
|
|
|
/**
|
|
* bus_set_iommu - set iommu-callbacks for the bus
|
|
* @bus: bus.
|
|
* @ops: the callbacks provided by the iommu-driver
|
|
*
|
|
* This function is called by an iommu driver to set the iommu methods
|
|
* used for a particular bus. Drivers for devices on that bus can use
|
|
* the iommu-api after these ops are registered.
|
|
* This special function is needed because IOMMUs are usually devices on
|
|
* the bus itself, so the iommu drivers are not initialized when the bus
|
|
* is set up. With this function the iommu-driver can set the iommu-ops
|
|
* afterwards.
|
|
*/
|
|
int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops)
|
|
{
|
|
if (bus->iommu_ops != NULL)
|
|
return -EBUSY;
|
|
|
|
bus->iommu_ops = ops;
|
|
|
|
/* Do IOMMU specific setup for this bus-type */
|
|
iommu_bus_init(bus, ops);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bus_set_iommu);
|
|
|
|
bool iommu_present(struct bus_type *bus)
|
|
{
|
|
return bus->iommu_ops != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_present);
|
|
|
|
/**
|
|
* iommu_set_fault_handler() - set a fault handler for an iommu domain
|
|
* @domain: iommu domain
|
|
* @handler: fault handler
|
|
* @token: user data, will be passed back to the fault handler
|
|
*
|
|
* This function should be used by IOMMU users which want to be notified
|
|
* whenever an IOMMU fault happens.
|
|
*
|
|
* The fault handler itself should return 0 on success, and an appropriate
|
|
* error code otherwise.
|
|
*/
|
|
void iommu_set_fault_handler(struct iommu_domain *domain,
|
|
iommu_fault_handler_t handler,
|
|
void *token)
|
|
{
|
|
BUG_ON(!domain);
|
|
|
|
domain->handler = handler;
|
|
domain->handler_token = token;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
|
|
|
|
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
|
|
{
|
|
struct iommu_domain *domain;
|
|
int ret;
|
|
|
|
if (bus == NULL || bus->iommu_ops == NULL)
|
|
return NULL;
|
|
|
|
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->ops = bus->iommu_ops;
|
|
|
|
ret = domain->ops->domain_init(domain);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
return domain;
|
|
|
|
out_free:
|
|
kfree(domain);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
|
|
|
|
void iommu_domain_free(struct iommu_domain *domain)
|
|
{
|
|
if (likely(domain->ops->domain_destroy != NULL))
|
|
domain->ops->domain_destroy(domain);
|
|
|
|
kfree(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_free);
|
|
|
|
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
if (unlikely(domain->ops->attach_dev == NULL))
|
|
return -ENODEV;
|
|
|
|
return domain->ops->attach_dev(domain, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_device);
|
|
|
|
void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
if (unlikely(domain->ops->detach_dev == NULL))
|
|
return;
|
|
|
|
domain->ops->detach_dev(domain, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_device);
|
|
|
|
/*
|
|
* IOMMU groups are really the natrual working unit of the IOMMU, but
|
|
* the IOMMU API works on domains and devices. Bridge that gap by
|
|
* iterating over the devices in a group. Ideally we'd have a single
|
|
* device which represents the requestor ID of the group, but we also
|
|
* allow IOMMU drivers to create policy defined minimum sets, where
|
|
* the physical hardware may be able to distiguish members, but we
|
|
* wish to group them at a higher level (ex. untrusted multi-function
|
|
* PCI devices). Thus we attach each device.
|
|
*/
|
|
static int iommu_group_do_attach_device(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
|
|
return iommu_attach_device(domain, dev);
|
|
}
|
|
|
|
int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
return iommu_group_for_each_dev(group, domain,
|
|
iommu_group_do_attach_device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_group);
|
|
|
|
static int iommu_group_do_detach_device(struct device *dev, void *data)
|
|
{
|
|
struct iommu_domain *domain = data;
|
|
|
|
iommu_detach_device(domain, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_group);
|
|
|
|
phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
|
|
{
|
|
if (unlikely(domain->ops->iova_to_phys == NULL))
|
|
return 0;
|
|
|
|
return domain->ops->iova_to_phys(domain, iova);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
|
|
|
|
int iommu_domain_has_cap(struct iommu_domain *domain,
|
|
unsigned long cap)
|
|
{
|
|
if (unlikely(domain->ops->domain_has_cap == NULL))
|
|
return 0;
|
|
|
|
return domain->ops->domain_has_cap(domain, cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
|
|
|
|
static size_t iommu_pgsize(struct iommu_domain *domain,
|
|
unsigned long addr_merge, size_t size)
|
|
{
|
|
unsigned int pgsize_idx;
|
|
size_t pgsize;
|
|
|
|
/* Max page size that still fits into 'size' */
|
|
pgsize_idx = __fls(size);
|
|
|
|
/* need to consider alignment requirements ? */
|
|
if (likely(addr_merge)) {
|
|
/* Max page size allowed by address */
|
|
unsigned int align_pgsize_idx = __ffs(addr_merge);
|
|
pgsize_idx = min(pgsize_idx, align_pgsize_idx);
|
|
}
|
|
|
|
/* build a mask of acceptable page sizes */
|
|
pgsize = (1UL << (pgsize_idx + 1)) - 1;
|
|
|
|
/* throw away page sizes not supported by the hardware */
|
|
pgsize &= domain->ops->pgsize_bitmap;
|
|
|
|
/* make sure we're still sane */
|
|
BUG_ON(!pgsize);
|
|
|
|
/* pick the biggest page */
|
|
pgsize_idx = __fls(pgsize);
|
|
pgsize = 1UL << pgsize_idx;
|
|
|
|
return pgsize;
|
|
}
|
|
|
|
int iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot)
|
|
{
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
size_t orig_size = size;
|
|
int ret = 0;
|
|
|
|
if (unlikely(domain->ops->unmap == NULL ||
|
|
domain->ops->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
|
|
|
|
/*
|
|
* both the virtual address and the physical one, as well as
|
|
* the size of the mapping, must be aligned (at least) to the
|
|
* size of the smallest page supported by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx pa 0x%pa size 0x%zx min_pagesz 0x%x\n",
|
|
iova, &paddr, size, min_pagesz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("map: iova 0x%lx pa 0x%pa size 0x%zx\n", iova, &paddr, size);
|
|
|
|
while (size) {
|
|
size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
|
|
|
|
pr_debug("mapping: iova 0x%lx pa 0x%pa pgsize 0x%zx\n",
|
|
iova, &paddr, pgsize);
|
|
|
|
ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
|
|
if (ret)
|
|
break;
|
|
|
|
iova += pgsize;
|
|
paddr += pgsize;
|
|
size -= pgsize;
|
|
}
|
|
|
|
/* unroll mapping in case something went wrong */
|
|
if (ret)
|
|
iommu_unmap(domain, orig_iova, orig_size - size);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map);
|
|
|
|
size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
|
|
{
|
|
size_t unmapped_page, unmapped = 0;
|
|
unsigned int min_pagesz;
|
|
|
|
if (unlikely(domain->ops->unmap == NULL ||
|
|
domain->ops->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
|
|
|
|
/*
|
|
* The virtual address, as well as the size of the mapping, must be
|
|
* aligned (at least) to the size of the smallest page supported
|
|
* by the hardware
|
|
*/
|
|
if (!IS_ALIGNED(iova | size, min_pagesz)) {
|
|
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
|
|
iova, size, min_pagesz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
|
|
|
|
/*
|
|
* Keep iterating until we either unmap 'size' bytes (or more)
|
|
* or we hit an area that isn't mapped.
|
|
*/
|
|
while (unmapped < size) {
|
|
size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
|
|
|
|
unmapped_page = domain->ops->unmap(domain, iova, pgsize);
|
|
if (!unmapped_page)
|
|
break;
|
|
|
|
pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
|
|
iova, unmapped_page);
|
|
|
|
iova += unmapped_page;
|
|
unmapped += unmapped_page;
|
|
}
|
|
|
|
return unmapped;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap);
|
|
|
|
|
|
int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
|
|
phys_addr_t paddr, u64 size, int prot)
|
|
{
|
|
if (unlikely(domain->ops->domain_window_enable == NULL))
|
|
return -ENODEV;
|
|
|
|
return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
|
|
prot);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
|
|
|
|
void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
|
|
{
|
|
if (unlikely(domain->ops->domain_window_disable == NULL))
|
|
return;
|
|
|
|
return domain->ops->domain_window_disable(domain, wnd_nr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
|
|
|
|
static int __init iommu_init(void)
|
|
{
|
|
iommu_group_kset = kset_create_and_add("iommu_groups",
|
|
NULL, kernel_kobj);
|
|
ida_init(&iommu_group_ida);
|
|
mutex_init(&iommu_group_mutex);
|
|
|
|
BUG_ON(!iommu_group_kset);
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(iommu_init);
|
|
|
|
int iommu_domain_get_attr(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data)
|
|
{
|
|
struct iommu_domain_geometry *geometry;
|
|
bool *paging;
|
|
int ret = 0;
|
|
u32 *count;
|
|
|
|
switch (attr) {
|
|
case DOMAIN_ATTR_GEOMETRY:
|
|
geometry = data;
|
|
*geometry = domain->geometry;
|
|
|
|
break;
|
|
case DOMAIN_ATTR_PAGING:
|
|
paging = data;
|
|
*paging = (domain->ops->pgsize_bitmap != 0UL);
|
|
break;
|
|
case DOMAIN_ATTR_WINDOWS:
|
|
count = data;
|
|
|
|
if (domain->ops->domain_get_windows != NULL)
|
|
*count = domain->ops->domain_get_windows(domain);
|
|
else
|
|
ret = -ENODEV;
|
|
|
|
break;
|
|
default:
|
|
if (!domain->ops->domain_get_attr)
|
|
return -EINVAL;
|
|
|
|
ret = domain->ops->domain_get_attr(domain, attr, data);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
|
|
|
|
int iommu_domain_set_attr(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data)
|
|
{
|
|
int ret = 0;
|
|
u32 *count;
|
|
|
|
switch (attr) {
|
|
case DOMAIN_ATTR_WINDOWS:
|
|
count = data;
|
|
|
|
if (domain->ops->domain_set_windows != NULL)
|
|
ret = domain->ops->domain_set_windows(domain, *count);
|
|
else
|
|
ret = -ENODEV;
|
|
|
|
break;
|
|
default:
|
|
if (domain->ops->domain_set_attr == NULL)
|
|
return -EINVAL;
|
|
|
|
ret = domain->ops->domain_set_attr(domain, attr, data);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
|