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![Suravee Suthikulpanit](/assets/img/avatar_default.png)
Currently, iommu_unmap, iommu_unmap_fast and iommu_map_sg return size_t. However, some of the return values are error codes (< 0), which can be misinterpreted as large size. Therefore, returning size 0 instead to signify failure to map/unmap. Cc: Joerg Roedel <joro@8bytes.org> Cc: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
1977 lines
49 KiB
C
1977 lines
49 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) "iommu: " fmt
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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 <linux/property.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 DEFINE_IDA(iommu_group_ida);
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static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
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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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struct iommu_domain *default_domain;
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struct iommu_domain *domain;
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};
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struct group_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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static const char * const iommu_group_resv_type_string[] = {
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[IOMMU_RESV_DIRECT] = "direct",
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[IOMMU_RESV_RESERVED] = "reserved",
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[IOMMU_RESV_MSI] = "msi",
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[IOMMU_RESV_SW_MSI] = "msi",
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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 LIST_HEAD(iommu_device_list);
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static DEFINE_SPINLOCK(iommu_device_lock);
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int iommu_device_register(struct iommu_device *iommu)
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{
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spin_lock(&iommu_device_lock);
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list_add_tail(&iommu->list, &iommu_device_list);
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spin_unlock(&iommu_device_lock);
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return 0;
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}
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void iommu_device_unregister(struct iommu_device *iommu)
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{
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spin_lock(&iommu_device_lock);
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list_del(&iommu->list);
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spin_unlock(&iommu_device_lock);
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}
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static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
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unsigned type);
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static int __iommu_attach_device(struct iommu_domain *domain,
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struct device *dev);
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static int __iommu_attach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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static void __iommu_detach_group(struct iommu_domain *domain,
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struct iommu_group *group);
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static int __init iommu_set_def_domain_type(char *str)
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{
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bool pt;
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if (!str || strtobool(str, &pt))
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return -EINVAL;
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iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA;
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return 0;
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}
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early_param("iommu.passthrough", iommu_set_def_domain_type);
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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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/**
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* iommu_insert_resv_region - Insert a new region in the
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* list of reserved regions.
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* @new: new region to insert
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* @regions: list of regions
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*
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* The new element is sorted by address with respect to the other
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* regions of the same type. In case it overlaps with another
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* region of the same type, regions are merged. In case it
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* overlaps with another region of different type, regions are
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* not merged.
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*/
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static int iommu_insert_resv_region(struct iommu_resv_region *new,
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struct list_head *regions)
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{
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struct iommu_resv_region *region;
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phys_addr_t start = new->start;
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phys_addr_t end = new->start + new->length - 1;
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struct list_head *pos = regions->next;
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while (pos != regions) {
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struct iommu_resv_region *entry =
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list_entry(pos, struct iommu_resv_region, list);
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phys_addr_t a = entry->start;
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phys_addr_t b = entry->start + entry->length - 1;
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int type = entry->type;
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if (end < a) {
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goto insert;
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} else if (start > b) {
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pos = pos->next;
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} else if ((start >= a) && (end <= b)) {
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if (new->type == type)
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goto done;
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else
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pos = pos->next;
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} else {
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if (new->type == type) {
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phys_addr_t new_start = min(a, start);
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phys_addr_t new_end = max(b, end);
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list_del(&entry->list);
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entry->start = new_start;
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entry->length = new_end - new_start + 1;
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iommu_insert_resv_region(entry, regions);
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} else {
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pos = pos->next;
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}
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}
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}
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insert:
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region = iommu_alloc_resv_region(new->start, new->length,
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new->prot, new->type);
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if (!region)
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return -ENOMEM;
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list_add_tail(®ion->list, pos);
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done:
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return 0;
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}
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static int
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iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
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struct list_head *group_resv_regions)
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{
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struct iommu_resv_region *entry;
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int ret = 0;
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list_for_each_entry(entry, dev_resv_regions, list) {
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ret = iommu_insert_resv_region(entry, group_resv_regions);
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if (ret)
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break;
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}
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return ret;
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}
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int iommu_get_group_resv_regions(struct iommu_group *group,
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struct list_head *head)
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{
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struct group_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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struct list_head dev_resv_regions;
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INIT_LIST_HEAD(&dev_resv_regions);
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iommu_get_resv_regions(device->dev, &dev_resv_regions);
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ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
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iommu_put_resv_regions(device->dev, &dev_resv_regions);
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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_get_group_resv_regions);
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static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
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char *buf)
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{
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struct iommu_resv_region *region, *next;
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struct list_head group_resv_regions;
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char *str = buf;
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INIT_LIST_HEAD(&group_resv_regions);
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iommu_get_group_resv_regions(group, &group_resv_regions);
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list_for_each_entry_safe(region, next, &group_resv_regions, list) {
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str += sprintf(str, "0x%016llx 0x%016llx %s\n",
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(long long int)region->start,
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(long long int)(region->start +
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region->length - 1),
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iommu_group_resv_type_string[region->type]);
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kfree(region);
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}
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return (str - buf);
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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 IOMMU_GROUP_ATTR(reserved_regions, 0444,
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iommu_group_show_resv_regions, 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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pr_debug("Releasing group %d\n", group->id);
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if (group->iommu_data_release)
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group->iommu_data_release(group->iommu_data);
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ida_simple_remove(&iommu_group_ida, group->id);
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if (group->default_domain)
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iommu_domain_free(group->default_domain);
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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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ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);
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if (ret < 0) {
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kfree(group);
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return ERR_PTR(ret);
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}
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group->id = ret;
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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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ida_simple_remove(&iommu_group_ida, group->id);
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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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ret = iommu_group_create_file(group,
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&iommu_group_attr_reserved_regions);
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if (ret)
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return ERR_PTR(ret);
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pr_debug("Allocated group %d\n", group->id);
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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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static int iommu_group_create_direct_mappings(struct iommu_group *group,
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struct device *dev)
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{
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struct iommu_domain *domain = group->default_domain;
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struct iommu_resv_region *entry;
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struct list_head mappings;
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unsigned long pg_size;
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int ret = 0;
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if (!domain || domain->type != IOMMU_DOMAIN_DMA)
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return 0;
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BUG_ON(!domain->pgsize_bitmap);
|
|
|
|
pg_size = 1UL << __ffs(domain->pgsize_bitmap);
|
|
INIT_LIST_HEAD(&mappings);
|
|
|
|
iommu_get_resv_regions(dev, &mappings);
|
|
|
|
/* We need to consider overlapping regions for different devices */
|
|
list_for_each_entry(entry, &mappings, list) {
|
|
dma_addr_t start, end, addr;
|
|
|
|
if (domain->ops->apply_resv_region)
|
|
domain->ops->apply_resv_region(dev, domain, entry);
|
|
|
|
start = ALIGN(entry->start, pg_size);
|
|
end = ALIGN(entry->start + entry->length, pg_size);
|
|
|
|
if (entry->type != IOMMU_RESV_DIRECT)
|
|
continue;
|
|
|
|
for (addr = start; addr < end; addr += pg_size) {
|
|
phys_addr_t phys_addr;
|
|
|
|
phys_addr = iommu_iova_to_phys(domain, addr);
|
|
if (phys_addr)
|
|
continue;
|
|
|
|
ret = iommu_map(domain, addr, addr, pg_size, entry->prot);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
}
|
|
|
|
iommu_flush_tlb_all(domain);
|
|
|
|
out:
|
|
iommu_put_resv_regions(dev, &mappings);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 group_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)
|
|
goto err_free_device;
|
|
|
|
device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
|
|
rename:
|
|
if (!device->name) {
|
|
ret = -ENOMEM;
|
|
goto err_remove_link;
|
|
}
|
|
|
|
ret = sysfs_create_link_nowarn(group->devices_kobj,
|
|
&dev->kobj, device->name);
|
|
if (ret) {
|
|
if (ret == -EEXIST && i >= 0) {
|
|
/*
|
|
* Account for the slim chance of collision
|
|
* and append an instance to the name.
|
|
*/
|
|
kfree(device->name);
|
|
device->name = kasprintf(GFP_KERNEL, "%s.%d",
|
|
kobject_name(&dev->kobj), i++);
|
|
goto rename;
|
|
}
|
|
goto err_free_name;
|
|
}
|
|
|
|
kobject_get(group->devices_kobj);
|
|
|
|
dev->iommu_group = group;
|
|
|
|
iommu_group_create_direct_mappings(group, dev);
|
|
|
|
mutex_lock(&group->mutex);
|
|
list_add_tail(&device->list, &group->devices);
|
|
if (group->domain)
|
|
ret = __iommu_attach_device(group->domain, dev);
|
|
mutex_unlock(&group->mutex);
|
|
if (ret)
|
|
goto err_put_group;
|
|
|
|
/* Notify any listeners about change to group. */
|
|
blocking_notifier_call_chain(&group->notifier,
|
|
IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
|
|
|
|
trace_add_device_to_group(group->id, dev);
|
|
|
|
pr_info("Adding device %s to group %d\n", dev_name(dev), group->id);
|
|
|
|
return 0;
|
|
|
|
err_put_group:
|
|
mutex_lock(&group->mutex);
|
|
list_del(&device->list);
|
|
mutex_unlock(&group->mutex);
|
|
dev->iommu_group = NULL;
|
|
kobject_put(group->devices_kobj);
|
|
err_free_name:
|
|
kfree(device->name);
|
|
err_remove_link:
|
|
sysfs_remove_link(&dev->kobj, "iommu_group");
|
|
err_free_device:
|
|
kfree(device);
|
|
pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret);
|
|
return ret;
|
|
}
|
|
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 group_device *tmp_device, *device = NULL;
|
|
|
|
pr_info("Removing device %s from group %d\n", dev_name(dev), group->id);
|
|
|
|
/* 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");
|
|
|
|
trace_remove_device_from_group(group->id, dev);
|
|
|
|
kfree(device->name);
|
|
kfree(device);
|
|
dev->iommu_group = NULL;
|
|
kobject_put(group->devices_kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
|
|
|
|
static int iommu_group_device_count(struct iommu_group *group)
|
|
{
|
|
struct group_device *entry;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(entry, &group->devices, list)
|
|
ret++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
struct group_device *device;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(device, &group->devices, list) {
|
|
ret = fn(device->dev, data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
int iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&group->mutex);
|
|
ret = __iommu_group_for_each_dev(group, data, fn);
|
|
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_ref_get - Increment reference on a group
|
|
* @group: the group to use, must not be NULL
|
|
*
|
|
* This function is called by iommu drivers to take additional references on an
|
|
* existing group. Returns the given group for convenience.
|
|
*/
|
|
struct iommu_group *iommu_group_ref_get(struct iommu_group *group)
|
|
{
|
|
kobject_get(group->devices_kobj);
|
|
return group;
|
|
}
|
|
|
|
/**
|
|
* 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 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 existing groups. DMA
|
|
* aliases are only supported 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 (pci_devs_are_dma_aliases(pdev, tmp)) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Generic device_group call-back function. It just allocates one
|
|
* iommu-group per device.
|
|
*/
|
|
struct iommu_group *generic_device_group(struct device *dev)
|
|
{
|
|
return iommu_group_alloc();
|
|
}
|
|
|
|
/*
|
|
* Use standard PCI bus topology, isolation features, and DMA alias quirks
|
|
* to find or create an IOMMU group for a device.
|
|
*/
|
|
struct iommu_group *pci_device_group(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct group_for_pci_data data;
|
|
struct pci_bus *bus;
|
|
struct iommu_group *group = NULL;
|
|
u64 devfns[4] = { 0 };
|
|
|
|
if (WARN_ON(!dev_is_pci(dev)))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (group)
|
|
return group;
|
|
|
|
if (!ops)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
group = ops->device_group(dev);
|
|
if (WARN_ON_ONCE(group == NULL))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (IS_ERR(group))
|
|
return group;
|
|
|
|
/*
|
|
* Try to allocate a default domain - needs support from the
|
|
* IOMMU driver.
|
|
*/
|
|
if (!group->default_domain) {
|
|
struct iommu_domain *dom;
|
|
|
|
dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
|
|
if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
|
|
dev_warn(dev,
|
|
"failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
|
|
iommu_def_domain_type);
|
|
dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
|
|
}
|
|
|
|
group->default_domain = dom;
|
|
if (!group->domain)
|
|
group->domain = dom;
|
|
}
|
|
|
|
ret = iommu_group_add_device(group, dev);
|
|
if (ret) {
|
|
iommu_group_put(group);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return group;
|
|
}
|
|
|
|
struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
|
|
{
|
|
return group->default_domain;
|
|
}
|
|
|
|
static int add_iommu_group(struct device *dev, void *data)
|
|
{
|
|
struct iommu_callback_data *cb = data;
|
|
const struct iommu_ops *ops = cb->ops;
|
|
int ret;
|
|
|
|
if (!ops->add_device)
|
|
return 0;
|
|
|
|
WARN_ON(dev->iommu_group);
|
|
|
|
ret = ops->add_device(dev);
|
|
|
|
/*
|
|
* We ignore -ENODEV errors for now, as they just mean that the
|
|
* device is not translated by an IOMMU. We still care about
|
|
* other errors and fail to initialize when they happen.
|
|
*/
|
|
if (ret == -ENODEV)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int remove_iommu_group(struct device *dev, void *data)
|
|
{
|
|
struct iommu_callback_data *cb = data;
|
|
const struct iommu_ops *ops = cb->ops;
|
|
|
|
if (ops->remove_device && dev->iommu_group)
|
|
ops->remove_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) {
|
|
int ret;
|
|
|
|
ret = ops->add_device(dev);
|
|
return (ret) ? NOTIFY_DONE : NOTIFY_OK;
|
|
}
|
|
} else if (action == BUS_NOTIFY_REMOVED_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)
|
|
goto out_free;
|
|
|
|
err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
|
|
if (err)
|
|
goto out_err;
|
|
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
/* Clean up */
|
|
bus_for_each_dev(bus, NULL, &cb, remove_iommu_group);
|
|
bus_unregister_notifier(bus, nb);
|
|
|
|
out_free:
|
|
kfree(nb);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
|
|
unsigned type)
|
|
{
|
|
struct iommu_domain *domain;
|
|
|
|
if (bus == NULL || bus->iommu_ops == NULL)
|
|
return NULL;
|
|
|
|
domain = bus->iommu_ops->domain_alloc(type);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->ops = bus->iommu_ops;
|
|
domain->type = type;
|
|
/* Assume all sizes by default; the driver may override this later */
|
|
domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
|
|
|
|
return domain;
|
|
}
|
|
|
|
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
|
|
{
|
|
return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
|
|
}
|
|
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);
|
|
|
|
static int __iommu_attach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
int ret;
|
|
if ((domain->ops->is_attach_deferred != NULL) &&
|
|
domain->ops->is_attach_deferred(domain, dev))
|
|
return 0;
|
|
|
|
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;
|
|
}
|
|
|
|
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Lock the group to make sure the device-count doesn't
|
|
* change while we are attaching
|
|
*/
|
|
mutex_lock(&group->mutex);
|
|
ret = -EINVAL;
|
|
if (iommu_group_device_count(group) != 1)
|
|
goto out_unlock;
|
|
|
|
ret = __iommu_attach_group(domain, group);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_attach_device);
|
|
|
|
static void __iommu_detach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
if ((domain->ops->is_attach_deferred != NULL) &&
|
|
domain->ops->is_attach_deferred(domain, dev))
|
|
return;
|
|
|
|
if (unlikely(domain->ops->detach_dev == NULL))
|
|
return;
|
|
|
|
domain->ops->detach_dev(domain, dev);
|
|
trace_detach_device_from_domain(dev);
|
|
}
|
|
|
|
void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
|
|
{
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return;
|
|
|
|
mutex_lock(&group->mutex);
|
|
if (iommu_group_device_count(group) != 1) {
|
|
WARN_ON(1);
|
|
goto out_unlock;
|
|
}
|
|
|
|
__iommu_detach_group(domain, group);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_detach_device);
|
|
|
|
struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
|
|
{
|
|
struct iommu_domain *domain;
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_get(dev);
|
|
if (!group)
|
|
return NULL;
|
|
|
|
domain = group->domain;
|
|
|
|
iommu_group_put(group);
|
|
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
static int __iommu_attach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
if (group->default_domain && group->domain != group->default_domain)
|
|
return -EBUSY;
|
|
|
|
ret = __iommu_group_for_each_dev(group, domain,
|
|
iommu_group_do_attach_device);
|
|
if (ret == 0)
|
|
group->domain = domain;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&group->mutex);
|
|
ret = __iommu_attach_group(domain, group);
|
|
mutex_unlock(&group->mutex);
|
|
|
|
return ret;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static void __iommu_detach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
int ret;
|
|
|
|
if (!group->default_domain) {
|
|
__iommu_group_for_each_dev(group, domain,
|
|
iommu_group_do_detach_device);
|
|
group->domain = NULL;
|
|
return;
|
|
}
|
|
|
|
if (group->domain == group->default_domain)
|
|
return;
|
|
|
|
/* Detach by re-attaching to the default domain */
|
|
ret = __iommu_group_for_each_dev(group, group->default_domain,
|
|
iommu_group_do_attach_device);
|
|
if (ret != 0)
|
|
WARN_ON(1);
|
|
else
|
|
group->domain = group->default_domain;
|
|
}
|
|
|
|
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
|
|
{
|
|
mutex_lock(&group->mutex);
|
|
__iommu_detach_group(domain, group);
|
|
mutex_unlock(&group->mutex);
|
|
}
|
|
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->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;
|
|
phys_addr_t orig_paddr = paddr;
|
|
int ret = 0;
|
|
|
|
if (unlikely(domain->ops->map == NULL ||
|
|
domain->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->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, orig_paddr, orig_size);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_map);
|
|
|
|
static size_t __iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size,
|
|
bool sync)
|
|
{
|
|
const struct iommu_ops *ops = domain->ops;
|
|
size_t unmapped_page, unmapped = 0;
|
|
unsigned long orig_iova = iova;
|
|
unsigned int min_pagesz;
|
|
|
|
if (unlikely(ops->unmap == NULL ||
|
|
domain->pgsize_bitmap == 0UL))
|
|
return 0;
|
|
|
|
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
|
|
return 0;
|
|
|
|
/* find out the minimum page size supported */
|
|
min_pagesz = 1 << __ffs(domain->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 0;
|
|
}
|
|
|
|
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 = ops->unmap(domain, iova, pgsize);
|
|
if (!unmapped_page)
|
|
break;
|
|
|
|
if (sync && ops->iotlb_range_add)
|
|
ops->iotlb_range_add(domain, iova, pgsize);
|
|
|
|
pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
|
|
iova, unmapped_page);
|
|
|
|
iova += unmapped_page;
|
|
unmapped += unmapped_page;
|
|
}
|
|
|
|
if (sync && ops->iotlb_sync)
|
|
ops->iotlb_sync(domain);
|
|
|
|
trace_unmap(orig_iova, size, unmapped);
|
|
return unmapped;
|
|
}
|
|
|
|
size_t iommu_unmap(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size)
|
|
{
|
|
return __iommu_unmap(domain, iova, size, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap);
|
|
|
|
size_t iommu_unmap_fast(struct iommu_domain *domain,
|
|
unsigned long iova, size_t size)
|
|
{
|
|
return __iommu_unmap(domain, iova, size, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_unmap_fast);
|
|
|
|
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->pgsize_bitmap == 0UL))
|
|
return 0;
|
|
|
|
min_pagesz = 1 << __ffs(domain->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);
|
|
|
|
/**
|
|
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
|
|
* @domain: the iommu domain where the fault has happened
|
|
* @dev: the device where the fault has happened
|
|
* @iova: the faulting address
|
|
* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
|
|
*
|
|
* This function should be called by the low-level IOMMU implementations
|
|
* whenever IOMMU faults happen, to allow high-level users, that are
|
|
* interested in such events, to know about them.
|
|
*
|
|
* This event may be useful for several possible use cases:
|
|
* - mere logging of the event
|
|
* - dynamic TLB/PTE loading
|
|
* - if restarting of the faulting device is required
|
|
*
|
|
* Returns 0 on success and an appropriate error code otherwise (if dynamic
|
|
* PTE/TLB loading will one day be supported, implementations will be able
|
|
* to tell whether it succeeded or not according to this return value).
|
|
*
|
|
* Specifically, -ENOSYS is returned if a fault handler isn't installed
|
|
* (though fault handlers can also return -ENOSYS, in case they want to
|
|
* elicit the default behavior of the IOMMU drivers).
|
|
*/
|
|
int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
|
|
unsigned long iova, int flags)
|
|
{
|
|
int ret = -ENOSYS;
|
|
|
|
/*
|
|
* if upper layers showed interest and installed a fault handler,
|
|
* invoke it.
|
|
*/
|
|
if (domain->handler)
|
|
ret = domain->handler(domain, dev, iova, flags,
|
|
domain->handler_token);
|
|
|
|
trace_io_page_fault(dev, iova, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(report_iommu_fault);
|
|
|
|
static int __init iommu_init(void)
|
|
{
|
|
iommu_group_kset = kset_create_and_add("iommu_groups",
|
|
NULL, kernel_kobj);
|
|
BUG_ON(!iommu_group_kset);
|
|
|
|
return 0;
|
|
}
|
|
core_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->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);
|
|
|
|
void iommu_get_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (ops && ops->get_resv_regions)
|
|
ops->get_resv_regions(dev, list);
|
|
}
|
|
|
|
void iommu_put_resv_regions(struct device *dev, struct list_head *list)
|
|
{
|
|
const struct iommu_ops *ops = dev->bus->iommu_ops;
|
|
|
|
if (ops && ops->put_resv_regions)
|
|
ops->put_resv_regions(dev, list);
|
|
}
|
|
|
|
struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
|
|
size_t length, int prot,
|
|
enum iommu_resv_type type)
|
|
{
|
|
struct iommu_resv_region *region;
|
|
|
|
region = kzalloc(sizeof(*region), GFP_KERNEL);
|
|
if (!region)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(®ion->list);
|
|
region->start = start;
|
|
region->length = length;
|
|
region->prot = prot;
|
|
region->type = type;
|
|
return region;
|
|
}
|
|
|
|
/* Request that a device is direct mapped by the IOMMU */
|
|
int iommu_request_dm_for_dev(struct device *dev)
|
|
{
|
|
struct iommu_domain *dm_domain;
|
|
struct iommu_group *group;
|
|
int ret;
|
|
|
|
/* Device must already be in a group before calling this function */
|
|
group = iommu_group_get_for_dev(dev);
|
|
if (IS_ERR(group))
|
|
return PTR_ERR(group);
|
|
|
|
mutex_lock(&group->mutex);
|
|
|
|
/* Check if the default domain is already direct mapped */
|
|
ret = 0;
|
|
if (group->default_domain &&
|
|
group->default_domain->type == IOMMU_DOMAIN_IDENTITY)
|
|
goto out;
|
|
|
|
/* Don't change mappings of existing devices */
|
|
ret = -EBUSY;
|
|
if (iommu_group_device_count(group) != 1)
|
|
goto out;
|
|
|
|
/* Allocate a direct mapped domain */
|
|
ret = -ENOMEM;
|
|
dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY);
|
|
if (!dm_domain)
|
|
goto out;
|
|
|
|
/* Attach the device to the domain */
|
|
ret = __iommu_attach_group(dm_domain, group);
|
|
if (ret) {
|
|
iommu_domain_free(dm_domain);
|
|
goto out;
|
|
}
|
|
|
|
/* Make the direct mapped domain the default for this group */
|
|
if (group->default_domain)
|
|
iommu_domain_free(group->default_domain);
|
|
group->default_domain = dm_domain;
|
|
|
|
pr_info("Using direct mapping for device %s\n", dev_name(dev));
|
|
|
|
ret = 0;
|
|
out:
|
|
mutex_unlock(&group->mutex);
|
|
iommu_group_put(group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
|
|
{
|
|
const struct iommu_ops *ops = NULL;
|
|
struct iommu_device *iommu;
|
|
|
|
spin_lock(&iommu_device_lock);
|
|
list_for_each_entry(iommu, &iommu_device_list, list)
|
|
if (iommu->fwnode == fwnode) {
|
|
ops = iommu->ops;
|
|
break;
|
|
}
|
|
spin_unlock(&iommu_device_lock);
|
|
return ops;
|
|
}
|
|
|
|
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
|
|
const struct iommu_ops *ops)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev->iommu_fwspec;
|
|
|
|
if (fwspec)
|
|
return ops == fwspec->ops ? 0 : -EINVAL;
|
|
|
|
fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
of_node_get(to_of_node(iommu_fwnode));
|
|
fwspec->iommu_fwnode = iommu_fwnode;
|
|
fwspec->ops = ops;
|
|
dev->iommu_fwspec = fwspec;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_init);
|
|
|
|
void iommu_fwspec_free(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev->iommu_fwspec;
|
|
|
|
if (fwspec) {
|
|
fwnode_handle_put(fwspec->iommu_fwnode);
|
|
kfree(fwspec);
|
|
dev->iommu_fwspec = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_free);
|
|
|
|
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev->iommu_fwspec;
|
|
size_t size;
|
|
int i;
|
|
|
|
if (!fwspec)
|
|
return -EINVAL;
|
|
|
|
size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
|
|
if (size > sizeof(*fwspec)) {
|
|
fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL);
|
|
if (!fwspec)
|
|
return -ENOMEM;
|
|
|
|
dev->iommu_fwspec = fwspec;
|
|
}
|
|
|
|
for (i = 0; i < num_ids; i++)
|
|
fwspec->ids[fwspec->num_ids + i] = ids[i];
|
|
|
|
fwspec->num_ids += num_ids;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
|