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android-kvm / linux / 2b2ca354674bed0d0222ce1426d2d45b065ac1e8 / . / drivers / iommu / iommu.c
blob: 68e648b55767060204a8f42d1927c09ebacad39a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
* Author: Joerg Roedel <jroedel@suse.de>
*/
#define pr_fmt(fmt) "iommu: " fmt
#include <linux/amba/bus.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/bits.h>
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/host1x_context_bus.h>
#include <linux/iommu.h>
#include <linux/idr.h>
#include <linux/err.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/fsl/mc.h>
#include <linux/module.h>
#include <linux/cc_platform.h>
#include <linux/cdx/cdx_bus.h>
#include <trace/events/iommu.h>
#include <linux/sched/mm.h>
#include <linux/msi.h>
#include "dma-iommu.h"
#include "iommu-priv.h"
#include "iommu-sva.h"
static struct kset *iommu_group_kset;
static DEFINE_IDA(iommu_group_ida);
static DEFINE_IDA(iommu_global_pasid_ida);
static unsigned int iommu_def_domain_type __read_mostly;
static bool iommu_dma_strict __read_mostly = IS_ENABLED(CONFIG_IOMMU_DEFAULT_DMA_STRICT);
static u32 iommu_cmd_line __read_mostly;
struct iommu_group {
struct kobject kobj;
struct kobject *devices_kobj;
struct list_head devices;
struct xarray pasid_array;
struct mutex mutex;
void *iommu_data;
void (*iommu_data_release)(void *iommu_data);
char *name;
int id;
struct iommu_domain *default_domain;
struct iommu_domain *blocking_domain;
struct iommu_domain *domain;
struct list_head entry;
unsigned int owner_cnt;
void *owner;
};
struct group_device {
struct list_head list;
struct device *dev;
char *name;
};
/* Iterate over each struct group_device in a struct iommu_group */
#define for_each_group_device(group, pos) \
list_for_each_entry(pos, &(group)->devices, list)
struct iommu_group_attribute {
struct attribute attr;
ssize_t (*show)(struct iommu_group *group, char *buf);
ssize_t (*store)(struct iommu_group *group,
const char *buf, size_t count);
};
static const char * const iommu_group_resv_type_string[] = {
[IOMMU_RESV_DIRECT] = "direct",
[IOMMU_RESV_DIRECT_RELAXABLE] = "direct-relaxable",
[IOMMU_RESV_RESERVED] = "reserved",
[IOMMU_RESV_MSI] = "msi",
[IOMMU_RESV_SW_MSI] = "msi",
};
#define IOMMU_CMD_LINE_DMA_API BIT(0)
#define IOMMU_CMD_LINE_STRICT BIT(1)
static int iommu_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data);
static void iommu_release_device(struct device *dev);
static struct iommu_domain *
__iommu_group_domain_alloc(struct iommu_group *group, unsigned int type);
static int __iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
static int __iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group);
enum {
IOMMU_SET_DOMAIN_MUST_SUCCEED = 1 << 0,
};
static int __iommu_device_set_domain(struct iommu_group *group,
struct device *dev,
struct iommu_domain *new_domain,
unsigned int flags);
static int __iommu_group_set_domain_internal(struct iommu_group *group,
struct iommu_domain *new_domain,
unsigned int flags);
static int __iommu_group_set_domain(struct iommu_group *group,
struct iommu_domain *new_domain)
{
return __iommu_group_set_domain_internal(group, new_domain, 0);
}
static void __iommu_group_set_domain_nofail(struct iommu_group *group,
struct iommu_domain *new_domain)
{
WARN_ON(__iommu_group_set_domain_internal(
group, new_domain, IOMMU_SET_DOMAIN_MUST_SUCCEED));
}
static int iommu_setup_default_domain(struct iommu_group *group,
int target_type);
static int iommu_create_device_direct_mappings(struct iommu_domain *domain,
struct device *dev);
static ssize_t iommu_group_store_type(struct iommu_group *group,
const char *buf, size_t count);
static struct group_device *iommu_group_alloc_device(struct iommu_group *group,
struct device *dev);
static void __iommu_group_free_device(struct iommu_group *group,
struct group_device *grp_dev);
#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
struct iommu_group_attribute iommu_group_attr_##_name = \
__ATTR(_name, _mode, _show, _store)
#define to_iommu_group_attr(_attr) \
container_of(_attr, struct iommu_group_attribute, attr)
#define to_iommu_group(_kobj) \
container_of(_kobj, struct iommu_group, kobj)
static LIST_HEAD(iommu_device_list);
static DEFINE_SPINLOCK(iommu_device_lock);
static const struct bus_type * const iommu_buses[] = {
&platform_bus_type,
#ifdef CONFIG_PCI
&pci_bus_type,
#endif
#ifdef CONFIG_ARM_AMBA
&amba_bustype,
#endif
#ifdef CONFIG_FSL_MC_BUS
&fsl_mc_bus_type,
#endif
#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
&host1x_context_device_bus_type,
#endif
#ifdef CONFIG_CDX_BUS
&cdx_bus_type,
#endif
};
/*
* Use a function instead of an array here because the domain-type is a
* bit-field, so an array would waste memory.
*/
static const char *iommu_domain_type_str(unsigned int t)
{
switch (t) {
case IOMMU_DOMAIN_BLOCKED:
return "Blocked";
case IOMMU_DOMAIN_IDENTITY:
return "Passthrough";
case IOMMU_DOMAIN_UNMANAGED:
return "Unmanaged";
case IOMMU_DOMAIN_DMA:
case IOMMU_DOMAIN_DMA_FQ:
return "Translated";
case IOMMU_DOMAIN_PLATFORM:
return "Platform";
default:
return "Unknown";
}
}
static int __init iommu_subsys_init(void)
{
struct notifier_block *nb;
if (!(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API)) {
if (IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH))
iommu_set_default_passthrough(false);
else
iommu_set_default_translated(false);
if (iommu_default_passthrough() && cc_platform_has(CC_ATTR_MEM_ENCRYPT)) {
pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n");
iommu_set_default_translated(false);
}
}
if (!iommu_default_passthrough() && !iommu_dma_strict)
iommu_def_domain_type = IOMMU_DOMAIN_DMA_FQ;
pr_info("Default domain type: %s%s\n",
iommu_domain_type_str(iommu_def_domain_type),
(iommu_cmd_line & IOMMU_CMD_LINE_DMA_API) ?
" (set via kernel command line)" : "");
if (!iommu_default_passthrough())
pr_info("DMA domain TLB invalidation policy: %s mode%s\n",
iommu_dma_strict ? "strict" : "lazy",
(iommu_cmd_line & IOMMU_CMD_LINE_STRICT) ?
" (set via kernel command line)" : "");
nb = kcalloc(ARRAY_SIZE(iommu_buses), sizeof(*nb), GFP_KERNEL);
if (!nb)
return -ENOMEM;
for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {
nb[i].notifier_call = iommu_bus_notifier;
bus_register_notifier(iommu_buses[i], &nb[i]);
}
return 0;
}
subsys_initcall(iommu_subsys_init);
static int remove_iommu_group(struct device *dev, void *data)
{
if (dev->iommu && dev->iommu->iommu_dev == data)
iommu_release_device(dev);
return 0;
}
/**
* iommu_device_register() - Register an IOMMU hardware instance
* @iommu: IOMMU handle for the instance
* @ops: IOMMU ops to associate with the instance
* @hwdev: (optional) actual instance device, used for fwnode lookup
*
* Return: 0 on success, or an error.
*/
int iommu_device_register(struct iommu_device *iommu,
const struct iommu_ops *ops, struct device *hwdev)
{
int err = 0;
/* We need to be able to take module references appropriately */
if (WARN_ON(is_module_address((unsigned long)ops) && !ops->owner))
return -EINVAL;
iommu->ops = ops;
if (hwdev)
iommu->fwnode = dev_fwnode(hwdev);
spin_lock(&iommu_device_lock);
list_add_tail(&iommu->list, &iommu_device_list);
spin_unlock(&iommu_device_lock);
for (int i = 0; i < ARRAY_SIZE(iommu_buses) && !err; i++)
err = bus_iommu_probe(iommu_buses[i]);
if (err)
iommu_device_unregister(iommu);
return err;
}
EXPORT_SYMBOL_GPL(iommu_device_register);
void iommu_device_unregister(struct iommu_device *iommu)
{
for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++)
bus_for_each_dev(iommu_buses[i], NULL, iommu, remove_iommu_group);
spin_lock(&iommu_device_lock);
list_del(&iommu->list);
spin_unlock(&iommu_device_lock);
/* Pairs with the alloc in generic_single_device_group() */
iommu_group_put(iommu->singleton_group);
iommu->singleton_group = NULL;
}
EXPORT_SYMBOL_GPL(iommu_device_unregister);
#if IS_ENABLED(CONFIG_IOMMUFD_TEST)
void iommu_device_unregister_bus(struct iommu_device *iommu,
struct bus_type *bus,
struct notifier_block *nb)
{
bus_unregister_notifier(bus, nb);
iommu_device_unregister(iommu);
}
EXPORT_SYMBOL_GPL(iommu_device_unregister_bus);
/*
* Register an iommu driver against a single bus. This is only used by iommufd
* selftest to create a mock iommu driver. The caller must provide
* some memory to hold a notifier_block.
*/
int iommu_device_register_bus(struct iommu_device *iommu,
const struct iommu_ops *ops, struct bus_type *bus,
struct notifier_block *nb)
{
int err;
iommu->ops = ops;
nb->notifier_call = iommu_bus_notifier;
err = bus_register_notifier(bus, nb);
if (err)
return err;
spin_lock(&iommu_device_lock);
list_add_tail(&iommu->list, &iommu_device_list);
spin_unlock(&iommu_device_lock);
err = bus_iommu_probe(bus);
if (err) {
iommu_device_unregister_bus(iommu, bus, nb);
return err;
}
return 0;
}
EXPORT_SYMBOL_GPL(iommu_device_register_bus);
#endif
static struct dev_iommu *dev_iommu_get(struct device *dev)
{
struct dev_iommu *param = dev->iommu;
lockdep_assert_held(&iommu_probe_device_lock);
if (param)
return param;
param = kzalloc(sizeof(*param), GFP_KERNEL);
if (!param)
return NULL;
mutex_init(&param->lock);
dev->iommu = param;
return param;
}
static void dev_iommu_free(struct device *dev)
{
struct dev_iommu *param = dev->iommu;
dev->iommu = NULL;
if (param->fwspec) {
fwnode_handle_put(param->fwspec->iommu_fwnode);
kfree(param->fwspec);
}
kfree(param);
}
/*
* Internal equivalent of device_iommu_mapped() for when we care that a device
* actually has API ops, and don't want false positives from VFIO-only groups.
*/
static bool dev_has_iommu(struct device *dev)
{
return dev->iommu && dev->iommu->iommu_dev;
}
static u32 dev_iommu_get_max_pasids(struct device *dev)
{
u32 max_pasids = 0, bits = 0;
int ret;
if (dev_is_pci(dev)) {
ret = pci_max_pasids(to_pci_dev(dev));
if (ret > 0)
max_pasids = ret;
} else {
ret = device_property_read_u32(dev, "pasid-num-bits", &bits);
if (!ret)
max_pasids = 1UL << bits;
}
return min_t(u32, max_pasids, dev->iommu->iommu_dev->max_pasids);
}
void dev_iommu_priv_set(struct device *dev, void *priv)
{
/* FSL_PAMU does something weird */
if (!IS_ENABLED(CONFIG_FSL_PAMU))
lockdep_assert_held(&iommu_probe_device_lock);
dev->iommu->priv = priv;
}
EXPORT_SYMBOL_GPL(dev_iommu_priv_set);
/*
* Init the dev->iommu and dev->iommu_group in the struct device and get the
* driver probed
*/
static int iommu_init_device(struct device *dev, const struct iommu_ops *ops)
{
struct iommu_device *iommu_dev;
struct iommu_group *group;
int ret;
if (!dev_iommu_get(dev))
return -ENOMEM;
if (!try_module_get(ops->owner)) {
ret = -EINVAL;
goto err_free;
}
iommu_dev = ops->probe_device(dev);
if (IS_ERR(iommu_dev)) {
ret = PTR_ERR(iommu_dev);
goto err_module_put;
}
dev->iommu->iommu_dev = iommu_dev;
ret = iommu_device_link(iommu_dev, dev);
if (ret)
goto err_release;
group = ops->device_group(dev);
if (WARN_ON_ONCE(group == NULL))
group = ERR_PTR(-EINVAL);
if (IS_ERR(group)) {
ret = PTR_ERR(group);
goto err_unlink;
}
dev->iommu_group = group;
dev->iommu->max_pasids = dev_iommu_get_max_pasids(dev);
if (ops->is_attach_deferred)
dev->iommu->attach_deferred = ops->is_attach_deferred(dev);
return 0;
err_unlink:
iommu_device_unlink(iommu_dev, dev);
err_release:
if (ops->release_device)
ops->release_device(dev);
err_module_put:
module_put(ops->owner);
err_free:
dev->iommu->iommu_dev = NULL;
dev_iommu_free(dev);
return ret;
}
static void iommu_deinit_device(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
const struct iommu_ops *ops = dev_iommu_ops(dev);
lockdep_assert_held(&group->mutex);
iommu_device_unlink(dev->iommu->iommu_dev, dev);
/*
* release_device() must stop using any attached domain on the device.
* If there are still other devices in the group they are not effected
* by this callback.
*
* The IOMMU driver must set the device to either an identity or
* blocking translation and stop using any domain pointer, as it is
* going to be freed.
*/
if (ops->release_device)
ops->release_device(dev);
/*
* If this is the last driver to use the group then we must free the
* domains before we do the module_put().
*/
if (list_empty(&group->devices)) {
if (group->default_domain) {
iommu_domain_free(group->default_domain);
group->default_domain = NULL;
}
if (group->blocking_domain) {
iommu_domain_free(group->blocking_domain);
group->blocking_domain = NULL;
}
group->domain = NULL;
}
/* Caller must put iommu_group */
dev->iommu_group = NULL;
module_put(ops->owner);
dev_iommu_free(dev);
}
DEFINE_MUTEX(iommu_probe_device_lock);
static int __iommu_probe_device(struct device *dev, struct list_head *group_list)
{
const struct iommu_ops *ops;
struct iommu_fwspec *fwspec;
struct iommu_group *group;
struct group_device *gdev;
int ret;
/*
* For FDT-based systems and ACPI IORT/VIOT, drivers register IOMMU
* instances with non-NULL fwnodes, and client devices should have been
* identified with a fwspec by this point. Otherwise, we can currently
* assume that only one of Intel, AMD, s390, PAMU or legacy SMMUv2 can
* be present, and that any of their registered instances has suitable
* ops for probing, and thus cheekily co-opt the same mechanism.
*/
fwspec = dev_iommu_fwspec_get(dev);
if (fwspec && fwspec->ops)
ops = fwspec->ops;
else
ops = iommu_ops_from_fwnode(NULL);
if (!ops)
return -ENODEV;
/*
* Serialise to avoid races between IOMMU drivers registering in
* parallel and/or the "replay" calls from ACPI/OF code via client
* driver probe. Once the latter have been cleaned up we should
* probably be able to use device_lock() here to minimise the scope,
* but for now enforcing a simple global ordering is fine.
*/
lockdep_assert_held(&iommu_probe_device_lock);
/* Device is probed already if in a group */
if (dev->iommu_group)
return 0;
ret = iommu_init_device(dev, ops);
if (ret)
return ret;
group = dev->iommu_group;
gdev = iommu_group_alloc_device(group, dev);
mutex_lock(&group->mutex);
if (IS_ERR(gdev)) {
ret = PTR_ERR(gdev);
goto err_put_group;
}
/*
* The gdev must be in the list before calling
* iommu_setup_default_domain()
*/
list_add_tail(&gdev->list, &group->devices);
WARN_ON(group->default_domain && !group->domain);
if (group->default_domain)
iommu_create_device_direct_mappings(group->default_domain, dev);
if (group->domain) {
ret = __iommu_device_set_domain(group, dev, group->domain, 0);
if (ret)
goto err_remove_gdev;
} else if (!group->default_domain && !group_list) {
ret = iommu_setup_default_domain(group, 0);
if (ret)
goto err_remove_gdev;
} else if (!group->default_domain) {
/*
* With a group_list argument we defer the default_domain setup
* to the caller by providing a de-duplicated list of groups
* that need further setup.
*/
if (list_empty(&group->entry))
list_add_tail(&group->entry, group_list);
}
mutex_unlock(&group->mutex);
if (dev_is_pci(dev))
iommu_dma_set_pci_32bit_workaround(dev);
return 0;
err_remove_gdev:
list_del(&gdev->list);
__iommu_group_free_device(group, gdev);
err_put_group:
iommu_deinit_device(dev);
mutex_unlock(&group->mutex);
iommu_group_put(group);
return ret;
}
int iommu_probe_device(struct device *dev)
{
const struct iommu_ops *ops;
int ret;
mutex_lock(&iommu_probe_device_lock);
ret = __iommu_probe_device(dev, NULL);
mutex_unlock(&iommu_probe_device_lock);
if (ret)
return ret;
ops = dev_iommu_ops(dev);
if (ops->probe_finalize)
ops->probe_finalize(dev);
return 0;
}
static void __iommu_group_free_device(struct iommu_group *group,
struct group_device *grp_dev)
{
struct device *dev = grp_dev->dev;
sysfs_remove_link(group->devices_kobj, grp_dev->name);
sysfs_remove_link(&dev->kobj, "iommu_group");
trace_remove_device_from_group(group->id, dev);
/*
* If the group has become empty then ownership must have been
* released, and the current domain must be set back to NULL or
* the default domain.
*/
if (list_empty(&group->devices))
WARN_ON(group->owner_cnt ||
group->domain != group->default_domain);
kfree(grp_dev->name);
kfree(grp_dev);
}
/* Remove the iommu_group from the struct device. */
static void __iommu_group_remove_device(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
struct group_device *device;
mutex_lock(&group->mutex);
for_each_group_device(group, device) {
if (device->dev != dev)
continue;
list_del(&device->list);
__iommu_group_free_device(group, device);
if (dev_has_iommu(dev))
iommu_deinit_device(dev);
else
dev->iommu_group = NULL;
break;
}
mutex_unlock(&group->mutex);
/*
* Pairs with the get in iommu_init_device() or
* iommu_group_add_device()
*/
iommu_group_put(group);
}
static void iommu_release_device(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
if (group)
__iommu_group_remove_device(dev);
/* Free any fwspec if no iommu_driver was ever attached */
if (dev->iommu)
dev_iommu_free(dev);
}
static int __init iommu_set_def_domain_type(char *str)
{
bool pt;
int ret;
ret = kstrtobool(str, &pt);
if (ret)
return ret;
if (pt)
iommu_set_default_passthrough(true);
else
iommu_set_default_translated(true);
return 0;
}
early_param("iommu.passthrough", iommu_set_def_domain_type);
static int __init iommu_dma_setup(char *str)
{
int ret = kstrtobool(str, &iommu_dma_strict);
if (!ret)
iommu_cmd_line |= IOMMU_CMD_LINE_STRICT;
return ret;
}
early_param("iommu.strict", iommu_dma_setup);
void iommu_set_dma_strict(void)
{
iommu_dma_strict = true;
if (iommu_def_domain_type == IOMMU_DOMAIN_DMA_FQ)
iommu_def_domain_type = IOMMU_DOMAIN_DMA;
}
static ssize_t iommu_group_attr_show(struct kobject *kobj,
struct attribute *__attr, char *buf)
{
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
struct iommu_group *group = to_iommu_group(kobj);
ssize_t ret = -EIO;
if (attr->show)
ret = attr->show(group, buf);
return ret;
}
static ssize_t iommu_group_attr_store(struct kobject *kobj,
struct attribute *__attr,
const char *buf, size_t count)
{
struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
struct iommu_group *group = to_iommu_group(kobj);
ssize_t ret = -EIO;
if (attr->store)
ret = attr->store(group, buf, count);
return ret;
}
static const struct sysfs_ops iommu_group_sysfs_ops = {
.show = iommu_group_attr_show,
.store = iommu_group_attr_store,
};
static int iommu_group_create_file(struct iommu_group *group,
struct iommu_group_attribute *attr)
{
return sysfs_create_file(&group->kobj, &attr->attr);
}
static void iommu_group_remove_file(struct iommu_group *group,
struct iommu_group_attribute *attr)
{
sysfs_remove_file(&group->kobj, &attr->attr);
}
static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
{
return sysfs_emit(buf, "%s\n", group->name);
}
/**
* iommu_insert_resv_region - Insert a new region in the
* list of reserved regions.
* @new: new region to insert
* @regions: list of regions
*
* Elements are sorted by start address and overlapping segments
* of the same type are merged.
*/
static int iommu_insert_resv_region(struct iommu_resv_region *new,
struct list_head *regions)
{
struct iommu_resv_region *iter, *tmp, *nr, *top;
LIST_HEAD(stack);
nr = iommu_alloc_resv_region(new->start, new->length,
new->prot, new->type, GFP_KERNEL);
if (!nr)
return -ENOMEM;
/* First add the new element based on start address sorting */
list_for_each_entry(iter, regions, list) {
if (nr->start < iter->start ||
(nr->start == iter->start && nr->type <= iter->type))
break;
}
list_add_tail(&nr->list, &iter->list);
/* Merge overlapping segments of type nr->type in @regions, if any */
list_for_each_entry_safe(iter, tmp, regions, list) {
phys_addr_t top_end, iter_end = iter->start + iter->length - 1;
/* no merge needed on elements of different types than @new */
if (iter->type != new->type) {
list_move_tail(&iter->list, &stack);
continue;
}
/* look for the last stack element of same type as @iter */
list_for_each_entry_reverse(top, &stack, list)
if (top->type == iter->type)
goto check_overlap;
list_move_tail(&iter->list, &stack);
continue;
check_overlap:
top_end = top->start + top->length - 1;
if (iter->start > top_end + 1) {
list_move_tail(&iter->list, &stack);
} else {
top->length = max(top_end, iter_end) - top->start + 1;
list_del(&iter->list);
kfree(iter);
}
}
list_splice(&stack, regions);
return 0;
}
static int
iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
struct list_head *group_resv_regions)
{
struct iommu_resv_region *entry;
int ret = 0;
list_for_each_entry(entry, dev_resv_regions, list) {
ret = iommu_insert_resv_region(entry, group_resv_regions);
if (ret)
break;
}
return ret;
}
int iommu_get_group_resv_regions(struct iommu_group *group,
struct list_head *head)
{
struct group_device *device;
int ret = 0;
mutex_lock(&group->mutex);
for_each_group_device(group, device) {
struct list_head dev_resv_regions;
/*
* Non-API groups still expose reserved_regions in sysfs,
* so filter out calls that get here that way.
*/
if (!dev_has_iommu(device->dev))
break;
INIT_LIST_HEAD(&dev_resv_regions);
iommu_get_resv_regions(device->dev, &dev_resv_regions);
ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
iommu_put_resv_regions(device->dev, &dev_resv_regions);
if (ret)
break;
}
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
char *buf)
{
struct iommu_resv_region *region, *next;
struct list_head group_resv_regions;
int offset = 0;
INIT_LIST_HEAD(&group_resv_regions);
iommu_get_group_resv_regions(group, &group_resv_regions);
list_for_each_entry_safe(region, next, &group_resv_regions, list) {
offset += sysfs_emit_at(buf, offset, "0x%016llx 0x%016llx %s\n",
(long long)region->start,
(long long)(region->start +
region->length - 1),
iommu_group_resv_type_string[region->type]);
kfree(region);
}
return offset;
}
static ssize_t iommu_group_show_type(struct iommu_group *group,
char *buf)
{
char *type = "unknown";
mutex_lock(&group->mutex);
if (group->default_domain) {
switch (group->default_domain->type) {
case IOMMU_DOMAIN_BLOCKED:
type = "blocked";
break;
case IOMMU_DOMAIN_IDENTITY:
type = "identity";
break;
case IOMMU_DOMAIN_UNMANAGED:
type = "unmanaged";
break;
case IOMMU_DOMAIN_DMA:
type = "DMA";
break;
case IOMMU_DOMAIN_DMA_FQ:
type = "DMA-FQ";
break;
}
}
mutex_unlock(&group->mutex);
return sysfs_emit(buf, "%s\n", type);
}
static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
static IOMMU_GROUP_ATTR(reserved_regions, 0444,
iommu_group_show_resv_regions, NULL);
static IOMMU_GROUP_ATTR(type, 0644, iommu_group_show_type,
iommu_group_store_type);
static void iommu_group_release(struct kobject *kobj)
{
struct iommu_group *group = to_iommu_group(kobj);
pr_debug("Releasing group %d\n", group->id);
if (group->iommu_data_release)
group->iommu_data_release(group->iommu_data);
ida_free(&iommu_group_ida, group->id);
/* Domains are free'd by iommu_deinit_device() */
WARN_ON(group->default_domain);
WARN_ON(group->blocking_domain);
kfree(group->name);
kfree(group);
}
static const struct kobj_type iommu_group_ktype = {
.sysfs_ops = &iommu_group_sysfs_ops,
.release = iommu_group_release,
};
/**
* iommu_group_alloc - Allocate a new group
*
* This function is called by an iommu driver to allocate a new iommu
* group. The iommu group represents the minimum granularity of the iommu.
* Upon successful return, the caller holds a reference to the supplied
* group in order to hold the group until devices are added. Use
* iommu_group_put() to release this extra reference count, allowing the
* group to be automatically reclaimed once it has no devices or external
* references.
*/
struct iommu_group *iommu_group_alloc(void)
{
struct iommu_group *group;
int ret;
group = kzalloc(sizeof(*group), GFP_KERNEL);
if (!group)
return ERR_PTR(-ENOMEM);
group->kobj.kset = iommu_group_kset;
mutex_init(&group->mutex);
INIT_LIST_HEAD(&group->devices);
INIT_LIST_HEAD(&group->entry);
xa_init(&group->pasid_array);
ret = ida_alloc(&iommu_group_ida, GFP_KERNEL);
if (ret < 0) {
kfree(group);
return ERR_PTR(ret);
}
group->id = ret;
ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
NULL, "%d", group->id);
if (ret) {
kobject_put(&group->kobj);
return ERR_PTR(ret);
}
group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
if (!group->devices_kobj) {
kobject_put(&group->kobj); /* triggers .release & free */
return ERR_PTR(-ENOMEM);
}
/*
* The devices_kobj holds a reference on the group kobject, so
* as long as that exists so will the group. We can therefore
* use the devices_kobj for reference counting.
*/
kobject_put(&group->kobj);
ret = iommu_group_create_file(group,
&iommu_group_attr_reserved_regions);
if (ret) {
kobject_put(group->devices_kobj);
return ERR_PTR(ret);
}
ret = iommu_group_create_file(group, &iommu_group_attr_type);
if (ret) {
kobject_put(group->devices_kobj);
return ERR_PTR(ret);
}
pr_debug("Allocated group %d\n", group->id);
return group;
}
EXPORT_SYMBOL_GPL(iommu_group_alloc);
/**
* iommu_group_get_iommudata - retrieve iommu_data registered for a group
* @group: the group
*
* iommu drivers can store data in the group for use when doing iommu
* operations. This function provides a way to retrieve it. Caller
* should hold a group reference.
*/
void *iommu_group_get_iommudata(struct iommu_group *group)
{
return group->iommu_data;
}
EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
/**
* iommu_group_set_iommudata - set iommu_data for a group
* @group: the group
* @iommu_data: new data
* @release: release function for iommu_data
*
* iommu drivers can store data in the group for use when doing iommu
* operations. This function provides a way to set the data after
* the group has been allocated. Caller should hold a group reference.
*/
void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
void (*release)(void *iommu_data))
{
group->iommu_data = iommu_data;
group->iommu_data_release = release;
}
EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
/**
* iommu_group_set_name - set name for a group
* @group: the group
* @name: name
*
* Allow iommu driver to set a name for a group. When set it will
* appear in a name attribute file under the group in sysfs.
*/
int iommu_group_set_name(struct iommu_group *group, const char *name)
{
int ret;
if (group->name) {
iommu_group_remove_file(group, &iommu_group_attr_name);
kfree(group->name);
group->name = NULL;
if (!name)
return 0;
}
group->name = kstrdup(name, GFP_KERNEL);
if (!group->name)
return -ENOMEM;
ret = iommu_group_create_file(group, &iommu_group_attr_name);
if (ret) {
kfree(group->name);
group->name = NULL;
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(iommu_group_set_name);
static int iommu_create_device_direct_mappings(struct iommu_domain *domain,
struct device *dev)
{
struct iommu_resv_region *entry;
struct list_head mappings;
unsigned long pg_size;
int ret = 0;
pg_size = domain->pgsize_bitmap ? 1UL << __ffs(domain->pgsize_bitmap) : 0;
INIT_LIST_HEAD(&mappings);
if (WARN_ON_ONCE(iommu_is_dma_domain(domain) && !pg_size))
return -EINVAL;
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;
size_t map_size = 0;
if (entry->type == IOMMU_RESV_DIRECT)
dev->iommu->require_direct = 1;
if ((entry->type != IOMMU_RESV_DIRECT &&
entry->type != IOMMU_RESV_DIRECT_RELAXABLE) ||
!iommu_is_dma_domain(domain))
continue;
start = ALIGN(entry->start, pg_size);
end = ALIGN(entry->start + entry->length, pg_size);
for (addr = start; addr <= end; addr += pg_size) {
phys_addr_t phys_addr;
if (addr == end)
goto map_end;
phys_addr = iommu_iova_to_phys(domain, addr);
if (!phys_addr) {
map_size += pg_size;
continue;
}
map_end:
if (map_size) {
ret = iommu_map(domain, addr - map_size,
addr - map_size, map_size,
entry->prot, GFP_KERNEL);
if (ret)
goto out;
map_size = 0;
}
}
}
if (!list_empty(&mappings) && iommu_is_dma_domain(domain))
iommu_flush_iotlb_all(domain);
out:
iommu_put_resv_regions(dev, &mappings);
return ret;
}
/* This is undone by __iommu_group_free_device() */
static struct group_device *iommu_group_alloc_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 ERR_PTR(-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;
}
trace_add_device_to_group(group->id, dev);
dev_info(dev, "Adding to iommu group %d\n", group->id);
return device;
err_free_name:
kfree(device->name);
err_remove_link:
sysfs_remove_link(&dev->kobj, "iommu_group");
err_free_device:
kfree(device);
dev_err(dev, "Failed to add to iommu group %d: %d\n", group->id, ret);
return ERR_PTR(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)
{
struct group_device *gdev;
gdev = iommu_group_alloc_device(group, dev);
if (IS_ERR(gdev))
return PTR_ERR(gdev);
iommu_group_ref_get(group);
dev->iommu_group = group;
mutex_lock(&group->mutex);
list_add_tail(&gdev->list, &group->devices);
mutex_unlock(&group->mutex);
return 0;
}
EXPORT_SYMBOL_GPL(iommu_group_add_device);
/**
* iommu_group_remove_device - remove a device from it's current group
* @dev: device to be removed
*
* This function is called by an iommu driver to remove the device from
* it's current group. This decrements the iommu group reference count.
*/
void iommu_group_remove_device(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
if (!group)
return;
dev_info(dev, "Removing from iommu group %d\n", group->id);
__iommu_group_remove_device(dev);
}
EXPORT_SYMBOL_GPL(iommu_group_remove_device);
static struct device *iommu_group_first_dev(struct iommu_group *group)
{
lockdep_assert_held(&group->mutex);
return list_first_entry(&group->devices, struct group_device, list)->dev;
}
/**
* iommu_group_for_each_dev - iterate over each device in the group
* @group: the group
* @data: caller opaque data to be passed to callback function
* @fn: caller supplied callback function
*
* This function is called by group users to iterate over group devices.
* Callers should hold a reference count to the group during callback.
* The group->mutex is held across callbacks, which will block calls to
* iommu_group_add/remove_device.
*/
int iommu_group_for_each_dev(struct iommu_group *group, void *data,
int (*fn)(struct device *, void *))
{
struct group_device *device;
int ret = 0;
mutex_lock(&group->mutex);
for_each_group_device(group, device) {
ret = fn(device->dev, data);
if (ret)
break;
}
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
/**
* iommu_group_get - Return the group for a device and increment reference
* @dev: get the group that this device belongs to
*
* This function is called by iommu drivers and users to get the group
* for the specified device. If found, the group is returned and the group
* reference in incremented, else NULL.
*/
struct iommu_group *iommu_group_get(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
if (group)
kobject_get(group->devices_kobj);
return group;
}
EXPORT_SYMBOL_GPL(iommu_group_get);
/**
* iommu_group_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;
}
EXPORT_SYMBOL_GPL(iommu_group_ref_get);
/**
* iommu_group_put - Decrement group reference
* @group: the group to use
*
* This function is called by iommu drivers and users to release the
* iommu group. Once the reference count is zero, the group is released.
*/
void iommu_group_put(struct iommu_group *group)
{
if (group)
kobject_put(group->devices_kobj);
}
EXPORT_SYMBOL_GPL(iommu_group_put);
/**
* iommu_register_device_fault_handler() - Register a device fault handler
* @dev: the device
* @handler: the fault handler
* @data: private data passed as argument to the handler
*
* When an IOMMU fault event is received, this handler gets called with the
* fault event and data as argument. The handler should return 0 on success. If
* the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also
* complete the fault by calling iommu_page_response() with one of the following
* response code:
* - IOMMU_PAGE_RESP_SUCCESS: retry the translation
* - IOMMU_PAGE_RESP_INVALID: terminate the fault
* - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting
* page faults if possible.
*
* Return 0 if the fault handler was installed successfully, or an error.
*/
int iommu_register_device_fault_handler(struct device *dev,
iommu_dev_fault_handler_t handler,
void *data)
{
struct dev_iommu *param = dev->iommu;
int ret = 0;
if (!param)
return -EINVAL;
mutex_lock(&param->lock);
/* Only allow one fault handler registered for each device */
if (param->fault_param) {
ret = -EBUSY;
goto done_unlock;
}
get_device(dev);
param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL);
if (!param->fault_param) {
put_device(dev);
ret = -ENOMEM;
goto done_unlock;
}
param->fault_param->handler = handler;
param->fault_param->data = data;
mutex_init(&param->fault_param->lock);
INIT_LIST_HEAD(&param->fault_param->faults);
done_unlock:
mutex_unlock(&param->lock);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler);
/**
* iommu_unregister_device_fault_handler() - Unregister the device fault handler
* @dev: the device
*
* Remove the device fault handler installed with
* iommu_register_device_fault_handler().
*
* Return 0 on success, or an error.
*/
int iommu_unregister_device_fault_handler(struct device *dev)
{
struct dev_iommu *param = dev->iommu;
int ret = 0;
if (!param)
return -EINVAL;
mutex_lock(&param->lock);
if (!param->fault_param)
goto unlock;
/* we cannot unregister handler if there are pending faults */
if (!list_empty(&param->fault_param->faults)) {
ret = -EBUSY;
goto unlock;
}
kfree(param->fault_param);
param->fault_param = NULL;
put_device(dev);
unlock:
mutex_unlock(&param->lock);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler);
/**
* iommu_report_device_fault() - Report fault event to device driver
* @dev: the device
* @evt: fault event data
*
* Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ
* handler. When this function fails and the fault is recoverable, it is the
* caller's responsibility to complete the fault.
*
* Return 0 on success, or an error.
*/
int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
{
struct dev_iommu *param = dev->iommu;
struct iommu_fault_event *evt_pending = NULL;
struct iommu_fault_param *fparam;
int ret = 0;
if (!param || !evt)
return -EINVAL;
/* we only report device fault if there is a handler registered */
mutex_lock(&param->lock);
fparam = param->fault_param;
if (!fparam || !fparam->handler) {
ret = -EINVAL;
goto done_unlock;
}
if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
(evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event),
GFP_KERNEL);
if (!evt_pending) {
ret = -ENOMEM;
goto done_unlock;
}
mutex_lock(&fparam->lock);
list_add_tail(&evt_pending->list, &fparam->faults);
mutex_unlock(&fparam->lock);
}
ret = fparam->handler(&evt->fault, fparam->data);
if (ret && evt_pending) {
mutex_lock(&fparam->lock);
list_del(&evt_pending->list);
mutex_unlock(&fparam->lock);
kfree(evt_pending);
}
done_unlock:
mutex_unlock(&param->lock);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_report_device_fault);
int iommu_page_response(struct device *dev,
struct iommu_page_response *msg)
{
bool needs_pasid;
int ret = -EINVAL;
struct iommu_fault_event *evt;
struct iommu_fault_page_request *prm;
struct dev_iommu *param = dev->iommu;
const struct iommu_ops *ops = dev_iommu_ops(dev);
bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID;
if (!ops->page_response)
return -ENODEV;
if (!param || !param->fault_param)
return -EINVAL;
if (msg->version != IOMMU_PAGE_RESP_VERSION_1 ||
msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID)
return -EINVAL;
/* Only send response if there is a fault report pending */
mutex_lock(&param->fault_param->lock);
if (list_empty(&param->fault_param->faults)) {
dev_warn_ratelimited(dev, "no pending PRQ, drop response\n");
goto done_unlock;
}
/*
* Check if we have a matching page request pending to respond,
* otherwise return -EINVAL
*/
list_for_each_entry(evt, &param->fault_param->faults, list) {
prm = &evt->fault.prm;
if (prm->grpid != msg->grpid)
continue;
/*
* If the PASID is required, the corresponding request is
* matched using the group ID, the PASID valid bit and the PASID
* value. Otherwise only the group ID matches request and
* response.
*/
needs_pasid = prm->flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID;
if (needs_pasid && (!has_pasid || msg->pasid != prm->pasid))
continue;
if (!needs_pasid && has_pasid) {
/* No big deal, just clear it. */
msg->flags &= ~IOMMU_PAGE_RESP_PASID_VALID;
msg->pasid = 0;
}
ret = ops->page_response(dev, evt, msg);
list_del(&evt->list);
kfree(evt);
break;
}
done_unlock:
mutex_unlock(&param->fault_param->lock);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_page_response);
/**
* 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();
}
EXPORT_SYMBOL_GPL(generic_device_group);
/*
* Generic device_group call-back function. It just allocates one
* iommu-group per iommu driver instance shared by every device
* probed by that iommu driver.
*/
struct iommu_group *generic_single_device_group(struct device *dev)
{
struct iommu_device *iommu = dev->iommu->iommu_dev;
if (!iommu->singleton_group) {
struct iommu_group *group;
group = iommu_group_alloc();
if (IS_ERR(group))
return group;
iommu->singleton_group = group;
}
return iommu_group_ref_get(iommu->singleton_group);
}
EXPORT_SYMBOL_GPL(generic_single_device_group);
/*
* 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();
}
EXPORT_SYMBOL_GPL(pci_device_group);
/* Get the IOMMU group for device on fsl-mc bus */
struct iommu_group *fsl_mc_device_group(struct device *dev)
{
struct device *cont_dev = fsl_mc_cont_dev(dev);
struct iommu_group *group;
group = iommu_group_get(cont_dev);
if (!group)
group = iommu_group_alloc();
return group;
}
EXPORT_SYMBOL_GPL(fsl_mc_device_group);
static struct iommu_domain *
__iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
{
if (group->default_domain && group->default_domain->type == req_type)
return group->default_domain;
return __iommu_group_domain_alloc(group, req_type);
}
/*
* req_type of 0 means "auto" which means to select a domain based on
* iommu_def_domain_type or what the driver actually supports.
*/
static struct iommu_domain *
iommu_group_alloc_default_domain(struct iommu_group *group, int req_type)
{
const struct iommu_ops *ops = dev_iommu_ops(iommu_group_first_dev(group));
struct iommu_domain *dom;
lockdep_assert_held(&group->mutex);
/*
* Allow legacy drivers to specify the domain that will be the default
* domain. This should always be either an IDENTITY/BLOCKED/PLATFORM
* domain. Do not use in new drivers.
*/
if (ops->default_domain) {
if (req_type)
return ERR_PTR(-EINVAL);
return ops->default_domain;
}
if (req_type)
return __iommu_group_alloc_default_domain(group, req_type);
/* The driver gave no guidance on what type to use, try the default */
dom = __iommu_group_alloc_default_domain(group, iommu_def_domain_type);
if (!IS_ERR(dom))
return dom;
/* Otherwise IDENTITY and DMA_FQ defaults will try DMA */
if (iommu_def_domain_type == IOMMU_DOMAIN_DMA)
return ERR_PTR(-EINVAL);
dom = __iommu_group_alloc_default_domain(group, IOMMU_DOMAIN_DMA);
if (IS_ERR(dom))
return dom;
pr_warn("Failed to allocate default IOMMU domain of type %u for group %s - Falling back to IOMMU_DOMAIN_DMA",
iommu_def_domain_type, group->name);
return dom;
}
struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
{
return group->default_domain;
}
static int probe_iommu_group(struct device *dev, void *data)
{
struct list_head *group_list = data;
int ret;
mutex_lock(&iommu_probe_device_lock);
ret = __iommu_probe_device(dev, group_list);
mutex_unlock(&iommu_probe_device_lock);
if (ret == -ENODEV)
ret = 0;
return ret;
}
static int iommu_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
if (action == BUS_NOTIFY_ADD_DEVICE) {
int ret;
ret = iommu_probe_device(dev);
return (ret) ? NOTIFY_DONE : NOTIFY_OK;
} else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
iommu_release_device(dev);
return NOTIFY_OK;
}
return 0;
}
/*
* Combine the driver's chosen def_domain_type across all the devices in a
* group. Drivers must give a consistent result.
*/
static int iommu_get_def_domain_type(struct iommu_group *group,
struct device *dev, int cur_type)
{
const struct iommu_ops *ops = dev_iommu_ops(dev);
int type;
if (!ops->def_domain_type)
return cur_type;
type = ops->def_domain_type(dev);
if (!type || cur_type == type)
return cur_type;
if (!cur_type)
return type;
dev_err_ratelimited(
dev,
"IOMMU driver error, requesting conflicting def_domain_type, %s and %s, for devices in group %u.\n",
iommu_domain_type_str(cur_type), iommu_domain_type_str(type),
group->id);
/*
* Try to recover, drivers are allowed to force IDENITY or DMA, IDENTITY
* takes precedence.
*/
if (type == IOMMU_DOMAIN_IDENTITY)
return type;
return cur_type;
}
/*
* A target_type of 0 will select the best domain type. 0 can be returned in
* this case meaning the global default should be used.
*/
static int iommu_get_default_domain_type(struct iommu_group *group,
int target_type)
{
struct device *untrusted = NULL;
struct group_device *gdev;
int driver_type = 0;
lockdep_assert_held(&group->mutex);
/*
* ARM32 drivers supporting CONFIG_ARM_DMA_USE_IOMMU can declare an
* identity_domain and it will automatically become their default
* domain. Later on ARM_DMA_USE_IOMMU will install its UNMANAGED domain.
* Override the selection to IDENTITY.
*/
if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
static_assert(!(IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) &&
IS_ENABLED(CONFIG_IOMMU_DMA)));
driver_type = IOMMU_DOMAIN_IDENTITY;
}
for_each_group_device(group, gdev) {
driver_type = iommu_get_def_domain_type(group, gdev->dev,
driver_type);
if (dev_is_pci(gdev->dev) && to_pci_dev(gdev->dev)->untrusted) {
/*
* No ARM32 using systems will set untrusted, it cannot
* work.
*/
if (WARN_ON(IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)))
return -1;
untrusted = gdev->dev;
}
}
/*
* If the common dma ops are not selected in kconfig then we cannot use
* IOMMU_DOMAIN_DMA at all. Force IDENTITY if nothing else has been
* selected.
*/
if (!IS_ENABLED(CONFIG_IOMMU_DMA)) {
if (WARN_ON(driver_type == IOMMU_DOMAIN_DMA))
return -1;
if (!driver_type)
driver_type = IOMMU_DOMAIN_IDENTITY;
}
if (untrusted) {
if (driver_type && driver_type != IOMMU_DOMAIN_DMA) {
dev_err_ratelimited(
untrusted,
"Device is not trusted, but driver is overriding group %u to %s, refusing to probe.\n",
group->id, iommu_domain_type_str(driver_type));
return -1;
}
driver_type = IOMMU_DOMAIN_DMA;
}
if (target_type) {
if (driver_type && target_type != driver_type)
return -1;
return target_type;
}
return driver_type;
}
static void iommu_group_do_probe_finalize(struct device *dev)
{
const struct iommu_ops *ops = dev_iommu_ops(dev);
if (ops->probe_finalize)
ops->probe_finalize(dev);
}
int bus_iommu_probe(const struct bus_type *bus)
{
struct iommu_group *group, *next;
LIST_HEAD(group_list);
int ret;
ret = bus_for_each_dev(bus, NULL, &group_list, probe_iommu_group);
if (ret)
return ret;
list_for_each_entry_safe(group, next, &group_list, entry) {
struct group_device *gdev;
mutex_lock(&group->mutex);
/* Remove item from the list */
list_del_init(&group->entry);
/*
* We go to the trouble of deferred default domain creation so
* that the cross-group default domain type and the setup of the
* IOMMU_RESV_DIRECT will work correctly in non-hotpug scenarios.
*/
ret = iommu_setup_default_domain(group, 0);
if (ret) {
mutex_unlock(&group->mutex);
return ret;
}
mutex_unlock(&group->mutex);
/*
* FIXME: Mis-locked because the ops->probe_finalize() call-back
* of some IOMMU drivers calls arm_iommu_attach_device() which
* in-turn might call back into IOMMU core code, where it tries
* to take group->mutex, resulting in a deadlock.
*/
for_each_group_device(group, gdev)
iommu_group_do_probe_finalize(gdev->dev);
}
return 0;
}
/**
* iommu_present() - make platform-specific assumptions about an IOMMU
* @bus: bus to check
*
* Do not use this function. You want device_iommu_mapped() instead.
*
* Return: true if some IOMMU is present and aware of devices on the given bus;
* in general it may not be the only IOMMU, and it may not have anything to do
* with whatever device you are ultimately interested in.
*/
bool iommu_present(const struct bus_type *bus)
{
bool ret = false;
for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {
if (iommu_buses[i] == bus) {
spin_lock(&iommu_device_lock);
ret = !list_empty(&iommu_device_list);
spin_unlock(&iommu_device_lock);
}
}
return ret;
}
EXPORT_SYMBOL_GPL(iommu_present);
/**
* device_iommu_capable() - check for a general IOMMU capability
* @dev: device to which the capability would be relevant, if available
* @cap: IOMMU capability
*
* Return: true if an IOMMU is present and supports the given capability
* for the given device, otherwise false.
*/
bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
{
const struct iommu_ops *ops;
if (!dev_has_iommu(dev))
return false;
ops = dev_iommu_ops(dev);
if (!ops->capable)
return false;
return ops->capable(dev, cap);
}
EXPORT_SYMBOL_GPL(device_iommu_capable);
/**
* iommu_group_has_isolated_msi() - Compute msi_device_has_isolated_msi()
* for a group
* @group: Group to query
*
* IOMMU groups should not have differing values of
* msi_device_has_isolated_msi() for devices in a group. However nothing
* directly prevents this, so ensure mistakes don't result in isolation failures
* by checking that all the devices are the same.
*/
bool iommu_group_has_isolated_msi(struct iommu_group *group)
{
struct group_device *group_dev;
bool ret = true;
mutex_lock(&group->mutex);
for_each_group_device(group, group_dev)
ret &= msi_device_has_isolated_msi(group_dev->dev);
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_has_isolated_msi);
/**
* 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(const struct iommu_ops *ops,
struct device *dev,
unsigned int type)
{
struct iommu_domain *domain;
unsigned int alloc_type = type & IOMMU_DOMAIN_ALLOC_FLAGS;
if (alloc_type == IOMMU_DOMAIN_IDENTITY && ops->identity_domain)
return ops->identity_domain;
else if (alloc_type == IOMMU_DOMAIN_BLOCKED && ops->blocked_domain)
return ops->blocked_domain;
else if (type & __IOMMU_DOMAIN_PAGING && ops->domain_alloc_paging)
domain = ops->domain_alloc_paging(dev);
else if (ops->domain_alloc)
domain = ops->domain_alloc(alloc_type);
else
return ERR_PTR(-EOPNOTSUPP);
/*
* Many domain_alloc ops now return ERR_PTR, make things easier for the
* driver by accepting ERR_PTR from all domain_alloc ops instead of
* having two rules.
*/
if (IS_ERR(domain))
return domain;
if (!domain)
return ERR_PTR(-ENOMEM);
domain->type = type;
domain->owner = ops;
/*
* If not already set, assume all sizes by default; the driver
* may override this later
*/
if (!domain->pgsize_bitmap)
domain->pgsize_bitmap = ops->pgsize_bitmap;
if (!domain->ops)
domain->ops = ops->default_domain_ops;
if (iommu_is_dma_domain(domain)) {
int rc;
rc = iommu_get_dma_cookie(domain);
if (rc) {
iommu_domain_free(domain);
return ERR_PTR(rc);
}
}
return domain;
}
static struct iommu_domain *
__iommu_group_domain_alloc(struct iommu_group *group, unsigned int type)
{
struct device *dev = iommu_group_first_dev(group);
return __iommu_domain_alloc(dev_iommu_ops(dev), dev, type);
}
static int __iommu_domain_alloc_dev(struct device *dev, void *data)
{
const struct iommu_ops **ops = data;
if (!dev_has_iommu(dev))
return 0;
if (WARN_ONCE(*ops && *ops != dev_iommu_ops(dev),
"Multiple IOMMU drivers present for bus %s, which the public IOMMU API can't fully support yet. You will still need to disable one or more for this to work, sorry!\n",
dev_bus_name(dev)))
return -EBUSY;
*ops = dev_iommu_ops(dev);
return 0;
}
struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
{
const struct iommu_ops *ops = NULL;
int err = bus_for_each_dev(bus, NULL, &ops, __iommu_domain_alloc_dev);
struct iommu_domain *domain;
if (err || !ops)
return NULL;
domain = __iommu_domain_alloc(ops, NULL, IOMMU_DOMAIN_UNMANAGED);
if (IS_ERR(domain))
return NULL;
return domain;
}
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
void iommu_domain_free(struct iommu_domain *domain)
{
if (domain->type == IOMMU_DOMAIN_SVA)
mmdrop(domain->mm);
iommu_put_dma_cookie(domain);
if (domain->ops->free)
domain->ops->free(domain);
}
EXPORT_SYMBOL_GPL(iommu_domain_free);
/*
* Put the group's domain back to the appropriate core-owned domain - either the
* standard kernel-mode DMA configuration or an all-DMA-blocked domain.
*/
static void __iommu_group_set_core_domain(struct iommu_group *group)
{
struct iommu_domain *new_domain;
if (group->owner)
new_domain = group->blocking_domain;
else
new_domain = group->default_domain;
__iommu_group_set_domain_nofail(group, new_domain);
}
static 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)
return ret;
dev->iommu->attach_deferred = 0;
trace_attach_device_to_domain(dev);
return 0;
}
/**
* iommu_attach_device - Attach an IOMMU domain to a device
* @domain: IOMMU domain to attach
* @dev: Device that will be attached
*
* Returns 0 on success and error code on failure
*
* Note that EINVAL can be treated as a soft failure, indicating
* that certain configuration of the domain is incompatible with
* the device. In this case attaching a different domain to the
* device may succeed.
*/
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
int ret;
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 (list_count_nodes(&group->devices) != 1)
goto out_unlock;
ret = __iommu_attach_group(domain, group);
out_unlock:
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_attach_device);
int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain)
{
if (dev->iommu && dev->iommu->attach_deferred)
return __iommu_attach_device(domain, dev);
return 0;
}
void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
if (!group)
return;
mutex_lock(&group->mutex);
if (WARN_ON(domain != group->domain) ||
WARN_ON(list_count_nodes(&group->devices) != 1))
goto out_unlock;
__iommu_group_set_core_domain(group);
out_unlock:
mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_detach_device);
struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
if (!group)
return NULL;
return group->domain;
}
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
/*
* For IOMMU_DOMAIN_DMA implementations which already provide their own
* guarantees that the group and its default domain are valid and correct.
*/
struct iommu_domain *iommu_get_dma_domain(struct device *dev)
{
return dev->iommu_group->default_domain;
}
static int __iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group)
{
struct device *dev;
if (group->domain && group->domain != group->default_domain &&
group->domain != group->blocking_domain)
return -EBUSY;
dev = iommu_group_first_dev(group);
if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner)
return -EINVAL;
return __iommu_group_set_domain(group, domain);
}
/**
* iommu_attach_group - Attach an IOMMU domain to an IOMMU group
* @domain: IOMMU domain to attach
* @group: IOMMU group that will be attached
*
* Returns 0 on success and error code on failure
*
* Note that EINVAL can be treated as a soft failure, indicating
* that certain configuration of the domain is incompatible with
* the group. In this case attaching a different domain to the
* group may succeed.
*/
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);
/**
* iommu_group_replace_domain - replace the domain that a group is attached to
* @new_domain: new IOMMU domain to replace with
* @group: IOMMU group that will be attached to the new domain
*
* This API allows the group to switch domains without being forced to go to
* the blocking domain in-between.
*
* If the currently attached domain is a core domain (e.g. a default_domain),
* it will act just like the iommu_attach_group().
*/
int iommu_group_replace_domain(struct iommu_group *group,
struct iommu_domain *new_domain)
{
int ret;
if (!new_domain)
return -EINVAL;
mutex_lock(&group->mutex);
ret = __iommu_group_set_domain(group, new_domain);
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_NS_GPL(iommu_group_replace_domain, IOMMUFD_INTERNAL);
static int __iommu_device_set_domain(struct iommu_group *group,
struct device *dev,
struct iommu_domain *new_domain,
unsigned int flags)
{
int ret;
/*
* If the device requires IOMMU_RESV_DIRECT then we cannot allow
* the blocking domain to be attached as it does not contain the
* required 1:1 mapping. This test effectively excludes the device
* being used with iommu_group_claim_dma_owner() which will block
* vfio and iommufd as well.
*/
if (dev->iommu->require_direct &&
(new_domain->type == IOMMU_DOMAIN_BLOCKED ||
new_domain == group->blocking_domain)) {
dev_warn(dev,
"Firmware has requested this device have a 1:1 IOMMU mapping, rejecting configuring the device without a 1:1 mapping. Contact your platform vendor.\n");
return -EINVAL;
}
if (dev->iommu->attach_deferred) {
if (new_domain == group->default_domain)
return 0;
dev->iommu->attach_deferred = 0;
}
ret = __iommu_attach_device(new_domain, dev);
if (ret) {
/*
* If we have a blocking domain then try to attach that in hopes
* of avoiding a UAF. Modern drivers should implement blocking
* domains as global statics that cannot fail.
*/
if ((flags & IOMMU_SET_DOMAIN_MUST_SUCCEED) &&
group->blocking_domain &&
group->blocking_domain != new_domain)
__iommu_attach_device(group->blocking_domain, dev);
return ret;
}
return 0;
}
/*
* If 0 is returned the group's domain is new_domain. If an error is returned
* then the group's domain will be set back to the existing domain unless
* IOMMU_SET_DOMAIN_MUST_SUCCEED, otherwise an error is returned and the group's
* domains is left inconsistent. This is a driver bug to fail attach with a
* previously good domain. We try to avoid a kernel UAF because of this.
*
* IOMMU groups are really the natural 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_set_domain_internal(struct iommu_group *group,
struct iommu_domain *new_domain,
unsigned int flags)
{
struct group_device *last_gdev;
struct group_device *gdev;
int result;
int ret;
lockdep_assert_held(&group->mutex);
if (group->domain == new_domain)
return 0;
if (WARN_ON(!new_domain))
return -EINVAL;
/*
* Changing the domain is done by calling attach_dev() on the new
* domain. This switch does not have to be atomic and DMA can be
* discarded during the transition. DMA must only be able to access
* either new_domain or group->domain, never something else.
*/
result = 0;
for_each_group_device(group, gdev) {
ret = __iommu_device_set_domain(group, gdev->dev, new_domain,
flags);
if (ret) {
result = ret;
/*
* Keep trying the other devices in the group. If a
* driver fails attach to an otherwise good domain, and
* does not support blocking domains, it should at least
* drop its reference on the current domain so we don't
* UAF.
*/
if (flags & IOMMU_SET_DOMAIN_MUST_SUCCEED)
continue;
goto err_revert;
}
}
group->domain = new_domain;
return result;
err_revert:
/*
* This is called in error unwind paths. A well behaved driver should
* always allow us to attach to a domain that was already attached.
*/
last_gdev = gdev;
for_each_group_device(group, gdev) {
/*
* A NULL domain can happen only for first probe, in which case
* we leave group->domain as NULL and let release clean
* everything up.
*/
if (group->domain)
WARN_ON(__iommu_device_set_domain(
group, gdev->dev, group->domain,
IOMMU_SET_DOMAIN_MUST_SUCCEED));
if (gdev == last_gdev)
break;
}
return ret;
}
void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
{
mutex_lock(&group->mutex);
__iommu_group_set_core_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 (domain->type == IOMMU_DOMAIN_IDENTITY)
return iova;
if (domain->type == IOMMU_DOMAIN_BLOCKED)
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 iova,
phys_addr_t paddr, size_t size, size_t *count)
{
unsigned int pgsize_idx, pgsize_idx_next;
unsigned long pgsizes;
size_t offset, pgsize, pgsize_next;
unsigned long addr_merge = paddr | iova;
/* Page sizes supported by the hardware and small enough for @size */
pgsizes = domain->pgsize_bitmap & GENMASK(__fls(size), 0);
/* Constrain the page sizes further based on the maximum alignment */
if (likely(addr_merge))
pgsizes &= GENMASK(__ffs(addr_merge), 0);
/* Make sure we have at least one suitable page size */
BUG_ON(!pgsizes);
/* Pick the biggest page size remaining */
pgsize_idx = __fls(pgsizes);
pgsize = BIT(pgsize_idx);
if (!count)
return pgsize;
/* Find the next biggest support page size, if it exists */
pgsizes = domain->pgsize_bitmap & ~GENMASK(pgsize_idx, 0);
if (!pgsizes)
goto out_set_count;
pgsize_idx_next = __ffs(pgsizes);
pgsize_next = BIT(pgsize_idx_next);
/*
* There's no point trying a bigger page size unless the virtual
* and physical addresses are similarly offset within the larger page.
*/
if ((iova ^ paddr) & (pgsize_next - 1))
goto out_set_count;
/* Calculate the offset to the next page size alignment boundary */
offset = pgsize_next - (addr_merge & (pgsize_next - 1));
/*
* If size is big enough to accommodate the larger page, reduce
* the number of smaller pages.
*/
if (offset + pgsize_next <= size)
size = offset;
out_set_count:
*count = size >> pgsize_idx;
return pgsize;
}
static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
{
const struct iommu_domain_ops *ops = domain->ops;
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->type & __IOMMU_DOMAIN_PAGING)))
return -EINVAL;
if (WARN_ON(!ops->map_pages || domain->pgsize_bitmap == 0UL))
return -ENODEV;
/* 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, count, mapped = 0;
pgsize = iommu_pgsize(domain, iova, paddr, size, &count);
pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx count %zu\n",
iova, &paddr, pgsize, count);
ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot,
gfp, &mapped);
/*
* Some pages may have been mapped, even if an error occurred,
* so we should account for those so they can be unmapped.
*/
size -= mapped;
if (ret)
break;
iova += mapped;
paddr += mapped;
}
/* 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;
}
int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
{
const struct iommu_domain_ops *ops = domain->ops;
int ret;
might_sleep_if(gfpflags_allow_blocking(gfp));
/* Discourage passing strange GFP flags */
if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
__GFP_HIGHMEM)))
return -EINVAL;
ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
if (ret == 0 && ops->iotlb_sync_map) {
ret = ops->iotlb_sync_map(domain, iova, size);
if (ret)
goto out_err;
}
return ret;
out_err:
/* undo mappings already done */
iommu_unmap(domain, iova, size);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_map);
static size_t __iommu_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size,
struct iommu_iotlb_gather *iotlb_gather)
{
const struct iommu_domain_ops *ops = domain->ops;
size_t unmapped_page, unmapped = 0;
unsigned long orig_iova = iova;
unsigned int min_pagesz;
if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
return 0;
if (WARN_ON(!ops->unmap_pages || domain->pgsize_bitmap == 0UL))
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, count;
pgsize = iommu_pgsize(domain, iova, iova, size - unmapped, &count);
unmapped_page = ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather);
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;
}
size_t iommu_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct iommu_iotlb_gather iotlb_gather;
size_t ret;
iommu_iotlb_gather_init(&iotlb_gather);
ret = __iommu_unmap(domain, iova, size, &iotlb_gather);
iommu_iotlb_sync(domain, &iotlb_gather);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_unmap);
size_t iommu_unmap_fast(struct iommu_domain *domain,
unsigned long iova, size_t size,
struct iommu_iotlb_gather *iotlb_gather)
{
return __iommu_unmap(domain, iova, size, iotlb_gather);
}
EXPORT_SYMBOL_GPL(iommu_unmap_fast);
ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents, int prot,
gfp_t gfp)
{
const struct iommu_domain_ops *ops = domain->ops;
size_t len = 0, mapped = 0;
phys_addr_t start;
unsigned int i = 0;
int ret;
might_sleep_if(gfpflags_allow_blocking(gfp));
/* Discourage passing strange GFP flags */
if (WARN_ON_ONCE(gfp & (__GFP_COMP | __GFP_DMA | __GFP_DMA32 |
__GFP_HIGHMEM)))
return -EINVAL;
while (i <= nents) {
phys_addr_t s_phys = sg_phys(sg);
if (len && s_phys != start + len) {
ret = __iommu_map(domain, iova + mapped, start,
len, prot, gfp);
if (ret)
goto out_err;
mapped += len;
len = 0;
}
if (sg_dma_is_bus_address(sg))
goto next;
if (len) {
len += sg->length;
} else {
len = sg->length;
start = s_phys;
}
next:
if (++i < nents)
sg = sg_next(sg);
}
if (ops->iotlb_sync_map) {
ret = ops->iotlb_sync_map(domain, iova, mapped);
if (ret)
goto out_err;
}
return mapped;
out_err:
/* undo mappings already done */
iommu_unmap(domain, iova, mapped);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_map_sg);
/**
* 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);
iommu_debugfs_setup();
return 0;
}
core_initcall(iommu_init);
int iommu_enable_nesting(struct iommu_domain *domain)
{
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
return -EINVAL;
if (!domain->ops->enable_nesting)
return -EINVAL;
return domain->ops->enable_nesting(domain);
}
EXPORT_SYMBOL_GPL(iommu_enable_nesting);
int iommu_set_pgtable_quirks(struct iommu_domain *domain,
unsigned long quirk)
{
if (domain->type != IOMMU_DOMAIN_UNMANAGED)
return -EINVAL;
if (!domain->ops->set_pgtable_quirks)
return -EINVAL;
return domain->ops->set_pgtable_quirks(domain, quirk);
}
EXPORT_SYMBOL_GPL(iommu_set_pgtable_quirks);
/**
* iommu_get_resv_regions - get reserved regions
* @dev: device for which to get reserved regions
* @list: reserved region list for device
*
* This returns a list of reserved IOVA regions specific to this device.
* A domain user should not map IOVA in these ranges.
*/
void iommu_get_resv_regions(struct device *dev, struct list_head *list)
{
const struct iommu_ops *ops = dev_iommu_ops(dev);
if (ops->get_resv_regions)
ops->get_resv_regions(dev, list);
}
EXPORT_SYMBOL_GPL(iommu_get_resv_regions);
/**
* iommu_put_resv_regions - release reserved regions
* @dev: device for which to free reserved regions
* @list: reserved region list for device
*
* This releases a reserved region list acquired by iommu_get_resv_regions().
*/
void iommu_put_resv_regions(struct device *dev, struct list_head *list)
{
struct iommu_resv_region *entry, *next;
list_for_each_entry_safe(entry, next, list, list) {
if (entry->free)
entry->free(dev, entry);
else
kfree(entry);
}
}
EXPORT_SYMBOL(iommu_put_resv_regions);
struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
size_t length, int prot,
enum iommu_resv_type type,
gfp_t gfp)
{
struct iommu_resv_region *region;
region = kzalloc(sizeof(*region), gfp);
if (!region)
return NULL;
INIT_LIST_HEAD(&region->list);
region->start = start;
region->length = length;
region->prot = prot;
region->type = type;
return region;
}
EXPORT_SYMBOL_GPL(iommu_alloc_resv_region);
void iommu_set_default_passthrough(bool cmd_line)
{
if (cmd_line)
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY;
}
void iommu_set_default_translated(bool cmd_line)
{
if (cmd_line)
iommu_cmd_line |= IOMMU_CMD_LINE_DMA_API;
iommu_def_domain_type = IOMMU_DOMAIN_DMA;
}
bool iommu_default_passthrough(void)
{
return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY;
}
EXPORT_SYMBOL_GPL(iommu_default_passthrough);
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_get(dev);
if (fwspec)
return ops == fwspec->ops ? 0 : -EINVAL;
if (!dev_iommu_get(dev))
return -ENOMEM;
/* Preallocate for the overwhelmingly common case of 1 ID */
fwspec = kzalloc(struct_size(fwspec, ids, 1), 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_set(dev, fwspec);
return 0;
}
EXPORT_SYMBOL_GPL(iommu_fwspec_init);
void iommu_fwspec_free(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
if (fwspec) {
fwnode_handle_put(fwspec->iommu_fwnode);
kfree(fwspec);
dev_iommu_fwspec_set(dev, 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_get(dev);
int i, new_num;
if (!fwspec)
return -EINVAL;
new_num = fwspec->num_ids + num_ids;
if (new_num > 1) {
fwspec = krealloc(fwspec, struct_size(fwspec, ids, new_num),
GFP_KERNEL);
if (!fwspec)
return -ENOMEM;
dev_iommu_fwspec_set(dev, fwspec);
}
for (i = 0; i < num_ids; i++)
fwspec->ids[fwspec->num_ids + i] = ids[i];
fwspec->num_ids = new_num;
return 0;
}
EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
/*
* Per device IOMMU features.
*/
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
if (dev_has_iommu(dev)) {
const struct iommu_ops *ops = dev_iommu_ops(dev);
if (ops->dev_enable_feat)
return ops->dev_enable_feat(dev, feat);
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
/*
* The device drivers should do the necessary cleanups before calling this.
*/
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
if (dev_has_iommu(dev)) {
const struct iommu_ops *ops = dev_iommu_ops(dev);
if (ops->dev_disable_feat)
return ops->dev_disable_feat(dev, feat);
}
return -EBUSY;
}
EXPORT_SYMBOL_GPL(iommu_dev_disable_feature);
/**
* iommu_setup_default_domain - Set the default_domain for the group
* @group: Group to change
* @target_type: Domain type to set as the default_domain
*
* Allocate a default domain and set it as the current domain on the group. If
* the group already has a default domain it will be changed to the target_type.
* When target_type is 0 the default domain is selected based on driver and
* system preferences.
*/
static int iommu_setup_default_domain(struct iommu_group *group,
int target_type)
{
struct iommu_domain *old_dom = group->default_domain;
struct group_device *gdev;
struct iommu_domain *dom;
bool direct_failed;
int req_type;
int ret;
lockdep_assert_held(&group->mutex);
req_type = iommu_get_default_domain_type(group, target_type);
if (req_type < 0)
return -EINVAL;
dom = iommu_group_alloc_default_domain(group, req_type);
if (IS_ERR(dom))
return PTR_ERR(dom);
if (group->default_domain == dom)
return 0;
/*
* IOMMU_RESV_DIRECT and IOMMU_RESV_DIRECT_RELAXABLE regions must be
* mapped before their device is attached, in order to guarantee
* continuity with any FW activity
*/
direct_failed = false;
for_each_group_device(group, gdev) {
if (iommu_create_device_direct_mappings(dom, gdev->dev)) {
direct_failed = true;
dev_warn_once(
gdev->dev->iommu->iommu_dev->dev,
"IOMMU driver was not able to establish FW requested direct mapping.");
}
}
/* We must set default_domain early for __iommu_device_set_domain */
group->default_domain = dom;
if (!group->domain) {
/*
* Drivers are not allowed to fail the first domain attach.
* The only way to recover from this is to fail attaching the
* iommu driver and call ops->release_device. Put the domain
* in group->default_domain so it is freed after.
*/
ret = __iommu_group_set_domain_internal(
group, dom, IOMMU_SET_DOMAIN_MUST_SUCCEED);
if (WARN_ON(ret))
goto out_free_old;
} else {
ret = __iommu_group_set_domain(group, dom);
if (ret)
goto err_restore_def_domain;
}
/*
* Drivers are supposed to allow mappings to be installed in a domain
* before device attachment, but some don't. Hack around this defect by
* trying again after attaching. If this happens it means the device
* will not continuously have the IOMMU_RESV_DIRECT map.
*/
if (direct_failed) {
for_each_group_device(group, gdev) {
ret = iommu_create_device_direct_mappings(dom, gdev->dev);
if (ret)
goto err_restore_domain;
}
}
out_free_old:
if (old_dom)
iommu_domain_free(old_dom);
return ret;
err_restore_domain:
if (old_dom)
__iommu_group_set_domain_internal(
group, old_dom, IOMMU_SET_DOMAIN_MUST_SUCCEED);
err_restore_def_domain:
if (old_dom) {
iommu_domain_free(dom);
group->default_domain = old_dom;
}
return ret;
}
/*
* Changing the default domain through sysfs requires the users to unbind the
* drivers from the devices in the iommu group, except for a DMA -> DMA-FQ
* transition. Return failure if this isn't met.
*
* We need to consider the race between this and the device release path.
* group->mutex is used here to guarantee that the device release path
* will not be entered at the same time.
*/
static ssize_t iommu_group_store_type(struct iommu_group *group,
const char *buf, size_t count)
{
struct group_device *gdev;
int ret, req_type;
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
if (WARN_ON(!group) || !group->default_domain)
return -EINVAL;
if (sysfs_streq(buf, "identity"))
req_type = IOMMU_DOMAIN_IDENTITY;
else if (sysfs_streq(buf, "DMA"))
req_type = IOMMU_DOMAIN_DMA;
else if (sysfs_streq(buf, "DMA-FQ"))
req_type = IOMMU_DOMAIN_DMA_FQ;
else if (sysfs_streq(buf, "auto"))
req_type = 0;
else
return -EINVAL;
mutex_lock(&group->mutex);
/* We can bring up a flush queue without tearing down the domain. */
if (req_type == IOMMU_DOMAIN_DMA_FQ &&
group->default_domain->type == IOMMU_DOMAIN_DMA) {
ret = iommu_dma_init_fq(group->default_domain);
if (ret)
goto out_unlock;
group->default_domain->type = IOMMU_DOMAIN_DMA_FQ;
ret = count;
goto out_unlock;
}
/* Otherwise, ensure that device exists and no driver is bound. */
if (list_empty(&group->devices) || group->owner_cnt) {
ret = -EPERM;
goto out_unlock;
}
ret = iommu_setup_default_domain(group, req_type);
if (ret)
goto out_unlock;
/*
* Release the mutex here because ops->probe_finalize() call-back of
* some vendor IOMMU drivers calls arm_iommu_attach_device() which
* in-turn might call back into IOMMU core code, where it tries to take
* group->mutex, resulting in a deadlock.
*/
mutex_unlock(&group->mutex);
/* Make sure dma_ops is appropriatley set */
for_each_group_device(group, gdev)
iommu_group_do_probe_finalize(gdev->dev);
return count;
out_unlock:
mutex_unlock(&group->mutex);
return ret ?: count;
}
/**
* iommu_device_use_default_domain() - Device driver wants to handle device
* DMA through the kernel DMA API.
* @dev: The device.
*
* The device driver about to bind @dev wants to do DMA through the kernel
* DMA API. Return 0 if it is allowed, otherwise an error.
*/
int iommu_device_use_default_domain(struct device *dev)
{
/* Caller is the driver core during the pre-probe path */
struct iommu_group *group = dev->iommu_group;
int ret = 0;
if (!group)
return 0;
mutex_lock(&group->mutex);
if (group->owner_cnt) {
if (group->domain != group->default_domain || group->owner ||
!xa_empty(&group->pasid_array)) {
ret = -EBUSY;
goto unlock_out;
}
}
group->owner_cnt++;
unlock_out:
mutex_unlock(&group->mutex);
return ret;
}
/**
* iommu_device_unuse_default_domain() - Device driver stops handling device
* DMA through the kernel DMA API.
* @dev: The device.
*
* The device driver doesn't want to do DMA through kernel DMA API anymore.
* It must be called after iommu_device_use_default_domain().
*/
void iommu_device_unuse_default_domain(struct device *dev)
{
/* Caller is the driver core during the post-probe path */
struct iommu_group *group = dev->iommu_group;
if (!group)
return;
mutex_lock(&group->mutex);
if (!WARN_ON(!group->owner_cnt || !xa_empty(&group->pasid_array)))
group->owner_cnt--;
mutex_unlock(&group->mutex);
}
static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
{
struct iommu_domain *domain;
if (group->blocking_domain)
return 0;
domain = __iommu_group_domain_alloc(group, IOMMU_DOMAIN_BLOCKED);
if (IS_ERR(domain)) {
/*
* For drivers that do not yet understand IOMMU_DOMAIN_BLOCKED
* create an empty domain instead.
*/
domain = __iommu_group_domain_alloc(group,
IOMMU_DOMAIN_UNMANAGED);
if (IS_ERR(domain))
return PTR_ERR(domain);
}
group->blocking_domain = domain;
return 0;
}
static int __iommu_take_dma_ownership(struct iommu_group *group, void *owner)
{
int ret;
if ((group->domain && group->domain != group->default_domain) ||
!xa_empty(&group->pasid_array))
return -EBUSY;
ret = __iommu_group_alloc_blocking_domain(group);
if (ret)
return ret;
ret = __iommu_group_set_domain(group, group->blocking_domain);
if (ret)
return ret;
group->owner = owner;
group->owner_cnt++;
return 0;
}
/**
* iommu_group_claim_dma_owner() - Set DMA ownership of a group
* @group: The group.
* @owner: Caller specified pointer. Used for exclusive ownership.
*
* This is to support backward compatibility for vfio which manages the dma
* ownership in iommu_group level. New invocations on this interface should be
* prohibited. Only a single owner may exist for a group.
*/
int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner)
{
int ret = 0;
if (WARN_ON(!owner))
return -EINVAL;
mutex_lock(&group->mutex);
if (group->owner_cnt) {
ret = -EPERM;
goto unlock_out;
}
ret = __iommu_take_dma_ownership(group, owner);
unlock_out:
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_group_claim_dma_owner);
/**
* iommu_device_claim_dma_owner() - Set DMA ownership of a device
* @dev: The device.
* @owner: Caller specified pointer. Used for exclusive ownership.
*
* Claim the DMA ownership of a device. Multiple devices in the same group may
* concurrently claim ownership if they present the same owner value. Returns 0
* on success and error code on failure
*/
int iommu_device_claim_dma_owner(struct device *dev, void *owner)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
int ret = 0;
if (WARN_ON(!owner))
return -EINVAL;
if (!group)
return -ENODEV;
mutex_lock(&group->mutex);
if (group->owner_cnt) {
if (group->owner != owner) {
ret = -EPERM;
goto unlock_out;
}
group->owner_cnt++;
goto unlock_out;
}
ret = __iommu_take_dma_ownership(group, owner);
unlock_out:
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_device_claim_dma_owner);
static void __iommu_release_dma_ownership(struct iommu_group *group)
{
if (WARN_ON(!group->owner_cnt || !group->owner ||
!xa_empty(&group->pasid_array)))
return;
group->owner_cnt = 0;
group->owner = NULL;
__iommu_group_set_domain_nofail(group, group->default_domain);
}
/**
* iommu_group_release_dma_owner() - Release DMA ownership of a group
* @group: The group
*
* Release the DMA ownership claimed by iommu_group_claim_dma_owner().
*/
void iommu_group_release_dma_owner(struct iommu_group *group)
{
mutex_lock(&group->mutex);
__iommu_release_dma_ownership(group);
mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_group_release_dma_owner);
/**
* iommu_device_release_dma_owner() - Release DMA ownership of a device
* @dev: The device.
*
* Release the DMA ownership claimed by iommu_device_claim_dma_owner().
*/
void iommu_device_release_dma_owner(struct device *dev)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
mutex_lock(&group->mutex);
if (group->owner_cnt > 1)
group->owner_cnt--;
else
__iommu_release_dma_ownership(group);
mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_device_release_dma_owner);
/**
* iommu_group_dma_owner_claimed() - Query group dma ownership status
* @group: The group.
*
* This provides status query on a given group. It is racy and only for
* non-binding status reporting.
*/
bool iommu_group_dma_owner_claimed(struct iommu_group *group)
{
unsigned int user;
mutex_lock(&group->mutex);
user = group->owner_cnt;
mutex_unlock(&group->mutex);
return user;
}
EXPORT_SYMBOL_GPL(iommu_group_dma_owner_claimed);
static int __iommu_set_group_pasid(struct iommu_domain *domain,
struct iommu_group *group, ioasid_t pasid)
{
struct group_device *device;
int ret = 0;
for_each_group_device(group, device) {
ret = domain->ops->set_dev_pasid(domain, device->dev, pasid);
if (ret)
break;
}
return ret;
}
static void __iommu_remove_group_pasid(struct iommu_group *group,
ioasid_t pasid)
{
struct group_device *device;
const struct iommu_ops *ops;
for_each_group_device(group, device) {
ops = dev_iommu_ops(device->dev);
ops->remove_dev_pasid(device->dev, pasid);
}
}
/*
* iommu_attach_device_pasid() - Attach a domain to pasid of device
* @domain: the iommu domain.
* @dev: the attached device.
* @pasid: the pasid of the device.
*
* Return: 0 on success, or an error.
*/
int iommu_attach_device_pasid(struct iommu_domain *domain,
struct device *dev, ioasid_t pasid)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
void *curr;
int ret;
if (!domain->ops->set_dev_pasid)
return -EOPNOTSUPP;
if (!group)
return -ENODEV;
if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner)
return -EINVAL;
mutex_lock(&group->mutex);
curr = xa_cmpxchg(&group->pasid_array, pasid, NULL, domain, GFP_KERNEL);
if (curr) {
ret = xa_err(curr) ? : -EBUSY;
goto out_unlock;
}
ret = __iommu_set_group_pasid(domain, group, pasid);
if (ret) {
__iommu_remove_group_pasid(group, pasid);
xa_erase(&group->pasid_array, pasid);
}
out_unlock:
mutex_unlock(&group->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_attach_device_pasid);
/*
* iommu_detach_device_pasid() - Detach the domain from pasid of device
* @domain: the iommu domain.
* @dev: the attached device.
* @pasid: the pasid of the device.
*
* The @domain must have been attached to @pasid of the @dev with
* iommu_attach_device_pasid().
*/
void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev,
ioasid_t pasid)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
mutex_lock(&group->mutex);
__iommu_remove_group_pasid(group, pasid);
WARN_ON(xa_erase(&group->pasid_array, pasid) != domain);
mutex_unlock(&group->mutex);
}
EXPORT_SYMBOL_GPL(iommu_detach_device_pasid);
/*
* iommu_get_domain_for_dev_pasid() - Retrieve domain for @pasid of @dev
* @dev: the queried device
* @pasid: the pasid of the device
* @type: matched domain type, 0 for any match
*
* This is a variant of iommu_get_domain_for_dev(). It returns the existing
* domain attached to pasid of a device. Callers must hold a lock around this
* function, and both iommu_attach/detach_dev_pasid() whenever a domain of
* type is being manipulated. This API does not internally resolve races with
* attach/detach.
*
* Return: attached domain on success, NULL otherwise.
*/
struct iommu_domain *iommu_get_domain_for_dev_pasid(struct device *dev,
ioasid_t pasid,
unsigned int type)
{
/* Caller must be a probed driver on dev */
struct iommu_group *group = dev->iommu_group;
struct iommu_domain *domain;
if (!group)
return NULL;
xa_lock(&group->pasid_array);
domain = xa_load(&group->pasid_array, pasid);
if (type && domain && domain->type != type)
domain = ERR_PTR(-EBUSY);
xa_unlock(&group->pasid_array);
return domain;
}
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev_pasid);
struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
struct mm_struct *mm)
{
const struct iommu_ops *ops = dev_iommu_ops(dev);
struct iommu_domain *domain;
domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
if (!domain)
return NULL;
domain->type = IOMMU_DOMAIN_SVA;
mmgrab(mm);
domain->mm = mm;
domain->owner = ops;
domain->iopf_handler = iommu_sva_handle_iopf;
domain->fault_data = mm;
return domain;
}
ioasid_t iommu_alloc_global_pasid(struct device *dev)
{
int ret;
/* max_pasids == 0 means that the device does not support PASID */
if (!dev->iommu->max_pasids)
return IOMMU_PASID_INVALID;
/*
* max_pasids is set up by vendor driver based on number of PASID bits
* supported but the IDA allocation is inclusive.
*/
ret = ida_alloc_range(&iommu_global_pasid_ida, IOMMU_FIRST_GLOBAL_PASID,
dev->iommu->max_pasids - 1, GFP_KERNEL);
return ret < 0 ? IOMMU_PASID_INVALID : ret;
}
EXPORT_SYMBOL_GPL(iommu_alloc_global_pasid);
void iommu_free_global_pasid(ioasid_t pasid)
{
if (WARN_ON(pasid == IOMMU_PASID_INVALID))
return;
ida_free(&iommu_global_pasid_ida, pasid);
}
EXPORT_SYMBOL_GPL(iommu_free_global_pasid);