![Joerg Roedel](/assets/img/avatar_default.png)
All drivers have been converted to the new domain_alloc and domain_free iommu-ops. So remove the old ones and get rid of iommu_domain->priv too, as this is no longer needed when the struct iommu_domain is embedded in the private structures of the iommu drivers. Tested-by: Thierry Reding <treding@nvidia.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
1276 lines
32 KiB
C
1276 lines
32 KiB
C
/*
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <jroedel@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/iommu.h>
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#include <linux/idr.h>
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#include <linux/notifier.h>
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#include <linux/err.h>
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#include <linux/pci.h>
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#include <linux/bitops.h>
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#include <trace/events/iommu.h>
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static struct kset *iommu_group_kset;
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static struct ida iommu_group_ida;
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static struct mutex iommu_group_mutex;
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struct iommu_callback_data {
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const struct iommu_ops *ops;
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};
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struct iommu_group {
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struct kobject kobj;
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struct kobject *devices_kobj;
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struct list_head devices;
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struct mutex mutex;
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struct blocking_notifier_head notifier;
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void *iommu_data;
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void (*iommu_data_release)(void *iommu_data);
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char *name;
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int id;
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};
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struct iommu_device {
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struct list_head list;
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struct device *dev;
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char *name;
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};
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struct iommu_group_attribute {
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struct attribute attr;
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ssize_t (*show)(struct iommu_group *group, char *buf);
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ssize_t (*store)(struct iommu_group *group,
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const char *buf, size_t count);
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};
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#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
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struct iommu_group_attribute iommu_group_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define to_iommu_group_attr(_attr) \
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container_of(_attr, struct iommu_group_attribute, attr)
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#define to_iommu_group(_kobj) \
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container_of(_kobj, struct iommu_group, kobj)
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static ssize_t iommu_group_attr_show(struct kobject *kobj,
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struct attribute *__attr, char *buf)
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{
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struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
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struct iommu_group *group = to_iommu_group(kobj);
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ssize_t ret = -EIO;
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if (attr->show)
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ret = attr->show(group, buf);
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return ret;
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}
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static ssize_t iommu_group_attr_store(struct kobject *kobj,
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struct attribute *__attr,
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const char *buf, size_t count)
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{
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struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
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struct iommu_group *group = to_iommu_group(kobj);
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ssize_t ret = -EIO;
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if (attr->store)
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ret = attr->store(group, buf, count);
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return ret;
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}
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static const struct sysfs_ops iommu_group_sysfs_ops = {
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.show = iommu_group_attr_show,
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.store = iommu_group_attr_store,
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};
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static int iommu_group_create_file(struct iommu_group *group,
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struct iommu_group_attribute *attr)
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{
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return sysfs_create_file(&group->kobj, &attr->attr);
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}
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static void iommu_group_remove_file(struct iommu_group *group,
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struct iommu_group_attribute *attr)
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{
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sysfs_remove_file(&group->kobj, &attr->attr);
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}
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static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
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{
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return sprintf(buf, "%s\n", group->name);
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}
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static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
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static void iommu_group_release(struct kobject *kobj)
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{
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struct iommu_group *group = to_iommu_group(kobj);
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if (group->iommu_data_release)
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group->iommu_data_release(group->iommu_data);
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mutex_lock(&iommu_group_mutex);
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ida_remove(&iommu_group_ida, group->id);
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mutex_unlock(&iommu_group_mutex);
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kfree(group->name);
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kfree(group);
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}
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static struct kobj_type iommu_group_ktype = {
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.sysfs_ops = &iommu_group_sysfs_ops,
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.release = iommu_group_release,
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};
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/**
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* iommu_group_alloc - Allocate a new group
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* @name: Optional name to associate with group, visible in sysfs
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*
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* This function is called by an iommu driver to allocate a new iommu
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* group. The iommu group represents the minimum granularity of the iommu.
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* Upon successful return, the caller holds a reference to the supplied
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* group in order to hold the group until devices are added. Use
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* iommu_group_put() to release this extra reference count, allowing the
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* group to be automatically reclaimed once it has no devices or external
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* references.
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*/
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struct iommu_group *iommu_group_alloc(void)
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{
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struct iommu_group *group;
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int ret;
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group = kzalloc(sizeof(*group), GFP_KERNEL);
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if (!group)
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return ERR_PTR(-ENOMEM);
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group->kobj.kset = iommu_group_kset;
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mutex_init(&group->mutex);
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INIT_LIST_HEAD(&group->devices);
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BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
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mutex_lock(&iommu_group_mutex);
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again:
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if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) {
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kfree(group);
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mutex_unlock(&iommu_group_mutex);
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return ERR_PTR(-ENOMEM);
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}
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if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id))
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goto again;
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mutex_unlock(&iommu_group_mutex);
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ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
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NULL, "%d", group->id);
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if (ret) {
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mutex_lock(&iommu_group_mutex);
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ida_remove(&iommu_group_ida, group->id);
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mutex_unlock(&iommu_group_mutex);
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kfree(group);
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return ERR_PTR(ret);
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}
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group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
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if (!group->devices_kobj) {
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kobject_put(&group->kobj); /* triggers .release & free */
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return ERR_PTR(-ENOMEM);
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}
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/*
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* The devices_kobj holds a reference on the group kobject, so
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* as long as that exists so will the group. We can therefore
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* use the devices_kobj for reference counting.
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*/
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kobject_put(&group->kobj);
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return group;
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}
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EXPORT_SYMBOL_GPL(iommu_group_alloc);
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struct iommu_group *iommu_group_get_by_id(int id)
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{
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struct kobject *group_kobj;
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struct iommu_group *group;
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const char *name;
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if (!iommu_group_kset)
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return NULL;
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name = kasprintf(GFP_KERNEL, "%d", id);
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if (!name)
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return NULL;
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group_kobj = kset_find_obj(iommu_group_kset, name);
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kfree(name);
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if (!group_kobj)
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return NULL;
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group = container_of(group_kobj, struct iommu_group, kobj);
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BUG_ON(group->id != id);
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kobject_get(group->devices_kobj);
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kobject_put(&group->kobj);
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return group;
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}
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EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
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/**
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* iommu_group_get_iommudata - retrieve iommu_data registered for a group
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* @group: the group
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*
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* iommu drivers can store data in the group for use when doing iommu
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* operations. This function provides a way to retrieve it. Caller
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* should hold a group reference.
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*/
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void *iommu_group_get_iommudata(struct iommu_group *group)
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{
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return group->iommu_data;
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}
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EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
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/**
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* iommu_group_set_iommudata - set iommu_data for a group
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* @group: the group
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* @iommu_data: new data
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* @release: release function for iommu_data
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*
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* iommu drivers can store data in the group for use when doing iommu
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* operations. This function provides a way to set the data after
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* the group has been allocated. Caller should hold a group reference.
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*/
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void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
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void (*release)(void *iommu_data))
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{
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group->iommu_data = iommu_data;
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group->iommu_data_release = release;
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}
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EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
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/**
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* iommu_group_set_name - set name for a group
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* @group: the group
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* @name: name
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*
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* Allow iommu driver to set a name for a group. When set it will
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* appear in a name attribute file under the group in sysfs.
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*/
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int iommu_group_set_name(struct iommu_group *group, const char *name)
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{
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int ret;
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if (group->name) {
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iommu_group_remove_file(group, &iommu_group_attr_name);
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kfree(group->name);
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group->name = NULL;
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if (!name)
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return 0;
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}
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group->name = kstrdup(name, GFP_KERNEL);
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if (!group->name)
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return -ENOMEM;
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ret = iommu_group_create_file(group, &iommu_group_attr_name);
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if (ret) {
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kfree(group->name);
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group->name = NULL;
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(iommu_group_set_name);
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/**
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* iommu_group_add_device - add a device to an iommu group
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* @group: the group into which to add the device (reference should be held)
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* @dev: the device
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*
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* This function is called by an iommu driver to add a device into a
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* group. Adding a device increments the group reference count.
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*/
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int iommu_group_add_device(struct iommu_group *group, struct device *dev)
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{
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int ret, i = 0;
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struct iommu_device *device;
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device = kzalloc(sizeof(*device), GFP_KERNEL);
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if (!device)
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return -ENOMEM;
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device->dev = dev;
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ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
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if (ret) {
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kfree(device);
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return ret;
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}
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device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
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rename:
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if (!device->name) {
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sysfs_remove_link(&dev->kobj, "iommu_group");
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kfree(device);
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return -ENOMEM;
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}
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ret = sysfs_create_link_nowarn(group->devices_kobj,
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&dev->kobj, device->name);
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if (ret) {
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kfree(device->name);
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if (ret == -EEXIST && i >= 0) {
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/*
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* Account for the slim chance of collision
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* and append an instance to the name.
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*/
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device->name = kasprintf(GFP_KERNEL, "%s.%d",
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kobject_name(&dev->kobj), i++);
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goto rename;
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}
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sysfs_remove_link(&dev->kobj, "iommu_group");
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kfree(device);
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return ret;
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}
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kobject_get(group->devices_kobj);
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dev->iommu_group = group;
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mutex_lock(&group->mutex);
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list_add_tail(&device->list, &group->devices);
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mutex_unlock(&group->mutex);
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/* Notify any listeners about change to group. */
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blocking_notifier_call_chain(&group->notifier,
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IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
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trace_add_device_to_group(group->id, dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(iommu_group_add_device);
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/**
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* iommu_group_remove_device - remove a device from it's current group
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* @dev: device to be removed
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*
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* This function is called by an iommu driver to remove the device from
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* it's current group. This decrements the iommu group reference count.
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*/
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void iommu_group_remove_device(struct device *dev)
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{
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struct iommu_group *group = dev->iommu_group;
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struct iommu_device *tmp_device, *device = NULL;
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/* Pre-notify listeners that a device is being removed. */
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blocking_notifier_call_chain(&group->notifier,
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IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
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mutex_lock(&group->mutex);
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list_for_each_entry(tmp_device, &group->devices, list) {
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if (tmp_device->dev == dev) {
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device = tmp_device;
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list_del(&device->list);
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break;
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}
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}
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mutex_unlock(&group->mutex);
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if (!device)
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return;
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sysfs_remove_link(group->devices_kobj, device->name);
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sysfs_remove_link(&dev->kobj, "iommu_group");
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trace_remove_device_from_group(group->id, dev);
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kfree(device->name);
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kfree(device);
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dev->iommu_group = NULL;
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kobject_put(group->devices_kobj);
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}
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EXPORT_SYMBOL_GPL(iommu_group_remove_device);
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/**
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* iommu_group_for_each_dev - iterate over each device in the group
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* @group: the group
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* @data: caller opaque data to be passed to callback function
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* @fn: caller supplied callback function
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*
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* This function is called by group users to iterate over group devices.
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* Callers should hold a reference count to the group during callback.
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* The group->mutex is held across callbacks, which will block calls to
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* iommu_group_add/remove_device.
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*/
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int iommu_group_for_each_dev(struct iommu_group *group, void *data,
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int (*fn)(struct device *, void *))
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{
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struct iommu_device *device;
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int ret = 0;
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mutex_lock(&group->mutex);
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list_for_each_entry(device, &group->devices, list) {
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ret = fn(device->dev, data);
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if (ret)
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break;
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}
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mutex_unlock(&group->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
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/**
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* iommu_group_get - Return the group for a device and increment reference
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* @dev: get the group that this device belongs to
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*
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* This function is called by iommu drivers and users to get the group
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* for the specified device. If found, the group is returned and the group
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* reference in incremented, else NULL.
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*/
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struct iommu_group *iommu_group_get(struct device *dev)
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{
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struct iommu_group *group = dev->iommu_group;
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if (group)
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kobject_get(group->devices_kobj);
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return group;
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}
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EXPORT_SYMBOL_GPL(iommu_group_get);
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/**
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* iommu_group_put - Decrement group reference
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* @group: the group to use
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*
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* This function is called by iommu drivers and users to release the
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* iommu group. Once the reference count is zero, the group is released.
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*/
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void iommu_group_put(struct iommu_group *group)
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{
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if (group)
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kobject_put(group->devices_kobj);
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}
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EXPORT_SYMBOL_GPL(iommu_group_put);
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/**
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* iommu_group_register_notifier - Register a notifier for group changes
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* @group: the group to watch
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* @nb: notifier block to signal
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*
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* This function allows iommu group users to track changes in a group.
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* See include/linux/iommu.h for actions sent via this notifier. Caller
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* should hold a reference to the group throughout notifier registration.
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*/
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int iommu_group_register_notifier(struct iommu_group *group,
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struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&group->notifier, nb);
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}
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EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
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/**
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* iommu_group_unregister_notifier - Unregister a notifier
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* @group: the group to watch
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* @nb: notifier block to signal
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*
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* Unregister a previously registered group notifier block.
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*/
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int iommu_group_unregister_notifier(struct iommu_group *group,
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struct notifier_block *nb)
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|
{
|
|
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 struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns);
|
|
|
|
/*
|
|
* To consider a PCI device isolated, we require ACS to support Source
|
|
* Validation, Request Redirection, Completer Redirection, and Upstream
|
|
* Forwarding. This effectively means that devices cannot spoof their
|
|
* requester ID, requests and completions cannot be redirected, and all
|
|
* transactions are forwarded upstream, even as it passes through a
|
|
* bridge where the target device is downstream.
|
|
*/
|
|
#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
|
|
|
|
/*
|
|
* For multifunction devices which are not isolated from each other, find
|
|
* all the other non-isolated functions and look for existing groups. For
|
|
* each function, we also need to look for aliases to or from other devices
|
|
* that may already have a group.
|
|
*/
|
|
static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns)
|
|
{
|
|
struct pci_dev *tmp = NULL;
|
|
struct iommu_group *group;
|
|
|
|
if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS))
|
|
return NULL;
|
|
|
|
for_each_pci_dev(tmp) {
|
|
if (tmp == pdev || tmp->bus != pdev->bus ||
|
|
PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) ||
|
|
pci_acs_enabled(tmp, REQ_ACS_FLAGS))
|
|
continue;
|
|
|
|
group = get_pci_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Look for aliases to or from the given device for exisiting groups. The
|
|
* dma_alias_devfn only supports aliases on the same bus, therefore the search
|
|
* space is quite small (especially since we're really only looking at pcie
|
|
* device, and therefore only expect multiple slots on the root complex or
|
|
* downstream switch ports). It's conceivable though that a pair of
|
|
* multifunction devices could have aliases between them that would cause a
|
|
* loop. To prevent this, we use a bitmap to track where we've been.
|
|
*/
|
|
static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
|
|
unsigned long *devfns)
|
|
{
|
|
struct pci_dev *tmp = NULL;
|
|
struct iommu_group *group;
|
|
|
|
if (test_and_set_bit(pdev->devfn & 0xff, devfns))
|
|
return NULL;
|
|
|
|
group = iommu_group_get(&pdev->dev);
|
|
if (group)
|
|
return group;
|
|
|
|
for_each_pci_dev(tmp) {
|
|
if (tmp == pdev || tmp->bus != pdev->bus)
|
|
continue;
|
|
|
|
/* We alias them or they alias us */
|
|
if (((pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
|
|
pdev->dma_alias_devfn == tmp->devfn) ||
|
|
((tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
|
|
tmp->dma_alias_devfn == pdev->devfn)) {
|
|
|
|
group = get_pci_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
|
|
group = get_pci_function_alias_group(tmp, devfns);
|
|
if (group) {
|
|
pci_dev_put(tmp);
|
|
return group;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct group_for_pci_data {
|
|
struct pci_dev *pdev;
|
|
struct iommu_group *group;
|
|
};
|
|
|
|
/*
|
|
* DMA alias iterator callback, return the last seen device. Stop and return
|
|
* the IOMMU group if we find one along the way.
|
|
*/
|
|
static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
|
|
{
|
|
struct group_for_pci_data *data = opaque;
|
|
|
|
data->pdev = pdev;
|
|
data->group = iommu_group_get(&pdev->dev);
|
|
|
|
return data->group != NULL;
|
|
}
|
|
|
|
/*
|
|
* Use standard PCI bus topology, isolation features, and DMA alias quirks
|
|
* to find or create an IOMMU group for a device.
|
|
*/
|
|
static struct iommu_group *iommu_group_get_for_pci_dev(struct pci_dev *pdev)
|
|
{
|
|
struct group_for_pci_data data;
|
|
struct pci_bus *bus;
|
|
struct iommu_group *group = NULL;
|
|
u64 devfns[4] = { 0 };
|
|
|
|
/*
|
|
* Find the upstream DMA alias for the device. A device must not
|
|
* be aliased due to topology in order to have its own IOMMU group.
|
|
* If we find an alias along the way that already belongs to a
|
|
* group, use it.
|
|
*/
|
|
if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data))
|
|
return data.group;
|
|
|
|
pdev = data.pdev;
|
|
|
|
/*
|
|
* Continue upstream from the point of minimum IOMMU granularity
|
|
* due to aliases to the point where devices are protected from
|
|
* peer-to-peer DMA by PCI ACS. Again, if we find an existing
|
|
* group, use it.
|
|
*/
|
|
for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
|
|
if (!bus->self)
|
|
continue;
|
|
|
|
if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
|
|
break;
|
|
|
|
pdev = bus->self;
|
|
|
|
group = iommu_group_get(&pdev->dev);
|
|
if (group)
|
|
return group;
|
|
}
|
|
|
|
/*
|
|
* Look for existing groups on device aliases. If we alias another
|
|
* device or another device aliases us, use the same group.
|
|
*/
|
|
group = get_pci_alias_group(pdev, (unsigned long *)devfns);
|
|
if (group)
|
|
return group;
|
|
|
|
/*
|
|
* Look for existing groups on non-isolated functions on the same
|
|
* slot and aliases of those funcions, if any. No need to clear
|
|
* the search bitmap, the tested devfns are still valid.
|
|
*/
|
|
group = get_pci_function_alias_group(pdev, (unsigned long *)devfns);
|
|
if (group)
|
|
return group;
|
|
|
|
/* No shared group found, allocate new */
|
|
return iommu_group_alloc();
|
|
}
|
|
|
|
/**
|
|
* iommu_group_get_for_dev - Find or create the IOMMU group for a device
|
|
* @dev: target device
|
|
*
|
|
* This function is intended to be called by IOMMU drivers and extended to
|
|
* support common, bus-defined algorithms when determining or creating the
|
|
* IOMMU group for a device. On success, the caller will hold a reference
|
|
* to the returned IOMMU group, which will already include the provided
|
|
* device. The reference should be released with iommu_group_put().
|
|
*/
|
|
struct iommu_group *iommu_group_get_for_dev(struct device *dev)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (group)
|
|
return group;
|
|
|
|
if (!dev_is_pci(dev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
group = iommu_group_get_for_pci_dev(to_pci_dev(dev));
|
|
|
|
if (IS_ERR(group))
|
|
return group;
|
|
|
|
ret = iommu_group_add_device(group, dev);
|
|
if (ret) {
|
|
iommu_group_put(group);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return group;
|
|
}
|
|
|
|
static int add_iommu_group(struct device *dev, void *data)
|
|
{
|
|
struct iommu_callback_data *cb = data;
|
|
const struct iommu_ops *ops = cb->ops;
|
|
|
|
if (!ops->add_device)
|
|
return 0;
|
|
|
|
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;
|
|
const 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 int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
|
|
{
|
|
int err;
|
|
struct notifier_block *nb;
|
|
struct iommu_callback_data cb = {
|
|
.ops = ops,
|
|
};
|
|
|
|
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
|
|
if (!nb)
|
|
return -ENOMEM;
|
|
|
|
nb->notifier_call = iommu_bus_notifier;
|
|
|
|
err = bus_register_notifier(bus, nb);
|
|
if (err) {
|
|
kfree(nb);
|
|
return err;
|
|
}
|
|
|
|
err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
|
|
if (err) {
|
|
bus_unregister_notifier(bus, nb);
|
|
kfree(nb);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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, const struct iommu_ops *ops)
|
|
{
|
|
int err;
|
|
|
|
if (bus->iommu_ops != NULL)
|
|
return -EBUSY;
|
|
|
|
bus->iommu_ops = ops;
|
|
|
|
/* Do IOMMU specific setup for this bus-type */
|
|
err = iommu_bus_init(bus, ops);
|
|
if (err)
|
|
bus->iommu_ops = NULL;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bus_set_iommu);
|
|
|
|
bool iommu_present(struct bus_type *bus)
|
|
{
|
|
return bus->iommu_ops != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_present);
|
|
|
|
bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
|
|
{
|
|
if (!bus->iommu_ops || !bus->iommu_ops->capable)
|
|
return false;
|
|
|
|
return bus->iommu_ops->capable(cap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_capable);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (bus == NULL || bus->iommu_ops == NULL)
|
|
return NULL;
|
|
|
|
domain = bus->iommu_ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->ops = bus->iommu_ops;
|
|
domain->type = IOMMU_DOMAIN_UNMANAGED;
|
|
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
|
|
|
|
void iommu_domain_free(struct iommu_domain *domain)
|
|
{
|
|
domain->ops->domain_free(domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_domain_free);
|
|
|
|
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
int ret;
|
|
if (unlikely(domain->ops->attach_dev == NULL))
|
|
return -ENODEV;
|
|
|
|
ret = domain->ops->attach_dev(domain, dev);
|
|
if (!ret)
|
|
trace_attach_device_to_domain(dev);
|
|
return ret;
|
|
}
|
|
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);
|
|
trace_detach_device_from_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);
|
|
|
|
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->map == NULL ||
|
|
domain->ops->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return -EINVAL;
|
|
|
|
/* 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 %pa size 0x%zx min_pagesz 0x%x\n",
|
|
iova, &paddr, size, min_pagesz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("map: iova 0x%lx pa %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 %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);
|
|
else
|
|
trace_map(orig_iova, paddr, orig_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;
|
|
unsigned long orig_iova = iova;
|
|
|
|
if (unlikely(domain->ops->unmap == NULL ||
|
|
domain->ops->pgsize_bitmap == 0UL))
|
|
return -ENODEV;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return -EINVAL;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
trace_unmap(orig_iova, size, unmapped);
|
|
return unmapped;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap);
|
|
|
|
size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
|
|
struct scatterlist *sg, unsigned int nents, int prot)
|
|
{
|
|
struct scatterlist *s;
|
|
size_t mapped = 0;
|
|
unsigned int i, min_pagesz;
|
|
int ret;
|
|
|
|
if (unlikely(domain->ops->pgsize_bitmap == 0UL))
|
|
return 0;
|
|
|
|
min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
|
|
|
|
/*
|
|
* We are mapping on IOMMU page boundaries, so offset within
|
|
* the page must be 0. However, the IOMMU may support pages
|
|
* smaller than PAGE_SIZE, so s->offset may still represent
|
|
* an offset of that boundary within the CPU page.
|
|
*/
|
|
if (!IS_ALIGNED(s->offset, min_pagesz))
|
|
goto out_err;
|
|
|
|
ret = iommu_map(domain, iova + mapped, phys, s->length, prot);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
mapped += s->length;
|
|
}
|
|
|
|
return mapped;
|
|
|
|
out_err:
|
|
/* undo mappings already done */
|
|
iommu_unmap(domain, iova, mapped);
|
|
|
|
return 0;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(default_iommu_map_sg);
|
|
|
|
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);
|