| /* |
| * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. |
| * Author: Joerg Roedel <jroedel@suse.de> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #define pr_fmt(fmt) "iommu: " fmt |
| |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/bug.h> |
| #include <linux/types.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/iommu.h> |
| #include <linux/idr.h> |
| #include <linux/notifier.h> |
| #include <linux/err.h> |
| #include <linux/pci.h> |
| #include <linux/bitops.h> |
| #include <linux/property.h> |
| #include <trace/events/iommu.h> |
| |
| static struct kset *iommu_group_kset; |
| static DEFINE_IDA(iommu_group_ida); |
| static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; |
| |
| struct iommu_callback_data { |
| const struct iommu_ops *ops; |
| }; |
| |
| struct iommu_group { |
| struct kobject kobj; |
| struct kobject *devices_kobj; |
| struct list_head devices; |
| struct mutex mutex; |
| struct blocking_notifier_head notifier; |
| void *iommu_data; |
| void (*iommu_data_release)(void *iommu_data); |
| char *name; |
| int id; |
| struct iommu_domain *default_domain; |
| struct iommu_domain *domain; |
| }; |
| |
| struct group_device { |
| struct list_head list; |
| struct device *dev; |
| char *name; |
| }; |
| |
| struct iommu_group_attribute { |
| struct attribute attr; |
| ssize_t (*show)(struct iommu_group *group, char *buf); |
| ssize_t (*store)(struct iommu_group *group, |
| const char *buf, size_t count); |
| }; |
| |
| static const char * const iommu_group_resv_type_string[] = { |
| [IOMMU_RESV_DIRECT] = "direct", |
| [IOMMU_RESV_RESERVED] = "reserved", |
| [IOMMU_RESV_MSI] = "msi", |
| [IOMMU_RESV_SW_MSI] = "msi", |
| }; |
| |
| #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); |
| |
| int iommu_device_register(struct iommu_device *iommu) |
| { |
| spin_lock(&iommu_device_lock); |
| list_add_tail(&iommu->list, &iommu_device_list); |
| spin_unlock(&iommu_device_lock); |
| |
| return 0; |
| } |
| |
| void iommu_device_unregister(struct iommu_device *iommu) |
| { |
| spin_lock(&iommu_device_lock); |
| list_del(&iommu->list); |
| spin_unlock(&iommu_device_lock); |
| } |
| |
| static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, |
| unsigned 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); |
| static void __iommu_detach_group(struct iommu_domain *domain, |
| struct iommu_group *group); |
| |
| static int __init iommu_set_def_domain_type(char *str) |
| { |
| bool pt; |
| |
| if (!str || strtobool(str, &pt)) |
| return -EINVAL; |
| |
| iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA; |
| return 0; |
| } |
| early_param("iommu.passthrough", iommu_set_def_domain_type); |
| |
| static ssize_t iommu_group_attr_show(struct kobject *kobj, |
| struct attribute *__attr, char *buf) |
| { |
| struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
| struct iommu_group *group = to_iommu_group(kobj); |
| ssize_t ret = -EIO; |
| |
| if (attr->show) |
| ret = attr->show(group, buf); |
| return ret; |
| } |
| |
| static ssize_t iommu_group_attr_store(struct kobject *kobj, |
| struct attribute *__attr, |
| const char *buf, size_t count) |
| { |
| struct iommu_group_attribute *attr = to_iommu_group_attr(__attr); |
| struct iommu_group *group = to_iommu_group(kobj); |
| ssize_t ret = -EIO; |
| |
| if (attr->store) |
| ret = attr->store(group, buf, count); |
| return ret; |
| } |
| |
| static const struct sysfs_ops iommu_group_sysfs_ops = { |
| .show = iommu_group_attr_show, |
| .store = iommu_group_attr_store, |
| }; |
| |
| static int iommu_group_create_file(struct iommu_group *group, |
| struct iommu_group_attribute *attr) |
| { |
| return sysfs_create_file(&group->kobj, &attr->attr); |
| } |
| |
| static void iommu_group_remove_file(struct iommu_group *group, |
| struct iommu_group_attribute *attr) |
| { |
| sysfs_remove_file(&group->kobj, &attr->attr); |
| } |
| |
| static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf) |
| { |
| return sprintf(buf, "%s\n", group->name); |
| } |
| |
| /** |
| * iommu_insert_resv_region - Insert a new region in the |
| * list of reserved regions. |
| * @new: new region to insert |
| * @regions: list of regions |
| * |
| * The new element is sorted by address with respect to the other |
| * regions of the same type. In case it overlaps with another |
| * region of the same type, regions are merged. In case it |
| * overlaps with another region of different type, regions are |
| * not merged. |
| */ |
| static int iommu_insert_resv_region(struct iommu_resv_region *new, |
| struct list_head *regions) |
| { |
| struct iommu_resv_region *region; |
| phys_addr_t start = new->start; |
| phys_addr_t end = new->start + new->length - 1; |
| struct list_head *pos = regions->next; |
| |
| while (pos != regions) { |
| struct iommu_resv_region *entry = |
| list_entry(pos, struct iommu_resv_region, list); |
| phys_addr_t a = entry->start; |
| phys_addr_t b = entry->start + entry->length - 1; |
| int type = entry->type; |
| |
| if (end < a) { |
| goto insert; |
| } else if (start > b) { |
| pos = pos->next; |
| } else if ((start >= a) && (end <= b)) { |
| if (new->type == type) |
| goto done; |
| else |
| pos = pos->next; |
| } else { |
| if (new->type == type) { |
| phys_addr_t new_start = min(a, start); |
| phys_addr_t new_end = max(b, end); |
| |
| list_del(&entry->list); |
| entry->start = new_start; |
| entry->length = new_end - new_start + 1; |
| iommu_insert_resv_region(entry, regions); |
| } else { |
| pos = pos->next; |
| } |
| } |
| } |
| insert: |
| region = iommu_alloc_resv_region(new->start, new->length, |
| new->prot, new->type); |
| if (!region) |
| return -ENOMEM; |
| |
| list_add_tail(®ion->list, pos); |
| done: |
| 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); |
| list_for_each_entry(device, &group->devices, list) { |
| struct list_head dev_resv_regions; |
| |
| 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; |
| char *str = buf; |
| |
| 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) { |
| str += sprintf(str, "0x%016llx 0x%016llx %s\n", |
| (long long int)region->start, |
| (long long int)(region->start + |
| region->length - 1), |
| iommu_group_resv_type_string[region->type]); |
| kfree(region); |
| } |
| |
| return (str - buf); |
| } |
| |
| 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 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_simple_remove(&iommu_group_ida, group->id); |
| |
| if (group->default_domain) |
| iommu_domain_free(group->default_domain); |
| |
| kfree(group->name); |
| kfree(group); |
| } |
| |
| static struct kobj_type iommu_group_ktype = { |
| .sysfs_ops = &iommu_group_sysfs_ops, |
| .release = iommu_group_release, |
| }; |
| |
| /** |
| * iommu_group_alloc - Allocate a new group |
| * @name: Optional name to associate with group, visible in sysfs |
| * |
| * This function is called by an iommu driver to allocate a new iommu |
| * group. The iommu group represents the minimum granularity of the iommu. |
| * Upon successful return, the caller holds a reference to the supplied |
| * group in order to hold the group until devices are added. Use |
| * iommu_group_put() to release this extra reference count, allowing the |
| * group to be automatically reclaimed once it has no devices or external |
| * references. |
| */ |
| struct iommu_group *iommu_group_alloc(void) |
| { |
| struct iommu_group *group; |
| int ret; |
| |
| group = kzalloc(sizeof(*group), GFP_KERNEL); |
| if (!group) |
| return ERR_PTR(-ENOMEM); |
| |
| group->kobj.kset = iommu_group_kset; |
| mutex_init(&group->mutex); |
| INIT_LIST_HEAD(&group->devices); |
| BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier); |
| |
| ret = ida_simple_get(&iommu_group_ida, 0, 0, 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) { |
| ida_simple_remove(&iommu_group_ida, group->id); |
| kfree(group); |
| return ERR_PTR(ret); |
| } |
| |
| group->devices_kobj = kobject_create_and_add("devices", &group->kobj); |
| if (!group->devices_kobj) { |
| kobject_put(&group->kobj); /* triggers .release & free */ |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| /* |
| * The devices_kobj holds a reference on the group kobject, so |
| * as long as that exists so will the group. We can therefore |
| * use the devices_kobj for reference counting. |
| */ |
| kobject_put(&group->kobj); |
| |
| ret = iommu_group_create_file(group, |
| &iommu_group_attr_reserved_regions); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| pr_debug("Allocated group %d\n", group->id); |
| |
| return group; |
| } |
| EXPORT_SYMBOL_GPL(iommu_group_alloc); |
| |
| struct iommu_group *iommu_group_get_by_id(int id) |
| { |
| struct kobject *group_kobj; |
| struct iommu_group *group; |
| const char *name; |
| |
| if (!iommu_group_kset) |
| return NULL; |
| |
| name = kasprintf(GFP_KERNEL, "%d", id); |
| if (!name) |
| return NULL; |
| |
| group_kobj = kset_find_obj(iommu_group_kset, name); |
| kfree(name); |
| |
| if (!group_kobj) |
| return NULL; |
| |
| group = container_of(group_kobj, struct iommu_group, kobj); |
| BUG_ON(group->id != id); |
| |
| kobject_get(group->devices_kobj); |
| kobject_put(&group->kobj); |
| |
| return group; |
| } |
| EXPORT_SYMBOL_GPL(iommu_group_get_by_id); |
| |
| /** |
| * iommu_group_get_iommudata - retrieve iommu_data registered for a group |
| * @group: the group |
| * |
| * iommu drivers can store data in the group for use when doing iommu |
| * operations. This function provides a way to retrieve it. Caller |
| * should hold a group reference. |
| */ |
| void *iommu_group_get_iommudata(struct iommu_group *group) |
| { |
| return group->iommu_data; |
| } |
| EXPORT_SYMBOL_GPL(iommu_group_get_iommudata); |
| |
| /** |
| * iommu_group_set_iommudata - set iommu_data for a group |
| * @group: the group |
| * @iommu_data: new data |
| * @release: release function for iommu_data |
| * |
| * iommu drivers can store data in the group for use when doing iommu |
| * operations. This function provides a way to set the data after |
| * the group has been allocated. Caller should hold a group reference. |
| */ |
| void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data, |
| void (*release)(void *iommu_data)) |
| { |
| group->iommu_data = iommu_data; |
| group->iommu_data_release = release; |
| } |
| EXPORT_SYMBOL_GPL(iommu_group_set_iommudata); |
| |
| /** |
| * iommu_group_set_name - set name for a group |
| * @group: the group |
| * @name: name |
| * |
| * Allow iommu driver to set a name for a group. When set it will |
| * appear in a name attribute file under the group in sysfs. |
| */ |
| int iommu_group_set_name(struct iommu_group *group, const char *name) |
| { |
| int ret; |
| |
| if (group->name) { |
| iommu_group_remove_file(group, &iommu_group_attr_name); |
| kfree(group->name); |
| group->name = NULL; |
| if (!name) |
| return 0; |
| } |
| |
| group->name = kstrdup(name, GFP_KERNEL); |
| if (!group->name) |
| return -ENOMEM; |
| |
| ret = iommu_group_create_file(group, &iommu_group_attr_name); |
| if (ret) { |
| kfree(group->name); |
| group->name = NULL; |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iommu_group_set_name); |
| |
| static int iommu_group_create_direct_mappings(struct iommu_group *group, |
| struct device *dev) |
| { |
| struct iommu_domain *domain = group->default_domain; |
| struct iommu_resv_region *entry; |
| struct list_head mappings; |
| unsigned long pg_size; |
| int ret = 0; |
| |
| if (!domain || domain->type != IOMMU_DOMAIN_DMA) |
| return 0; |
| |
| 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; |
| } |
| |
| } |
| |
| 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) |
| { |
| struct iommu_group *group; |
| |
| group = iommu_group_alloc(); |
| if (IS_ERR(group)) |
| return NULL; |
| |
| return 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 */ |
| group = iommu_group_alloc(); |
| if (IS_ERR(group)) |
| return NULL; |
| |
| return group; |
| } |
| |
| /** |
| * 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; |
| |
| group = ERR_PTR(-EINVAL); |
| |
| if (ops && ops->device_group) |
| group = ops->device_group(dev); |
| |
| 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 (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); |
| /* FIXME: Remove this when groups a mandatory for iommu drivers */ |
| if (group == NULL) |
| return __iommu_attach_device(domain, dev); |
| |
| /* |
| * We have a group - lock it 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 (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); |
| /* FIXME: Remove this when groups a mandatory for iommu drivers */ |
| if (group == NULL) |
| return __iommu_detach_device(domain, dev); |
| |
| 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); |
| /* FIXME: Remove this when groups a mandatory for iommu drivers */ |
| if (group == NULL) |
| 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); |
| |
| size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) |
| { |
| size_t unmapped_page, unmapped = 0; |
| unsigned int min_pagesz; |
| unsigned long orig_iova = iova; |
| |
| if (unlikely(domain->ops->unmap == NULL || |
| domain->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); |
| |
| /* |
| * The virtual address, as well as the size of the mapping, must be |
| * aligned (at least) to the size of the smallest page supported |
| * by the hardware |
| */ |
| if (!IS_ALIGNED(iova | size, min_pagesz)) { |
| pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
| iova, size, min_pagesz); |
| return -EINVAL; |
| } |
| |
| pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
| |
| /* |
| * Keep iterating until we either unmap 'size' bytes (or more) |
| * or we hit an area that isn't mapped. |
| */ |
| while (unmapped < size) { |
| size_t pgsize = iommu_pgsize(domain, iova, size - unmapped); |
| |
| unmapped_page = domain->ops->unmap(domain, iova, pgsize); |
| if (!unmapped_page) |
| break; |
| |
| pr_debug("unmapped: iova 0x%lx size 0x%zx\n", |
| iova, unmapped_page); |
| |
| iova += unmapped_page; |
| unmapped += unmapped_page; |
| } |
| |
| trace_unmap(orig_iova, size, unmapped); |
| return unmapped; |
| } |
| EXPORT_SYMBOL_GPL(iommu_unmap); |
| |
| size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
| struct scatterlist *sg, unsigned int nents, int prot) |
| { |
| struct scatterlist *s; |
| size_t mapped = 0; |
| unsigned int i, min_pagesz; |
| int ret; |
| |
| if (unlikely(domain->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); |