| // 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/device.h> |
| #include <linux/dma-iommu.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/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 <linux/fsl/mc.h> |
| #include <linux/module.h> |
| #include <linux/cc_platform.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 __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 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 list_head entry; |
| }; |
| |
| 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_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_alloc_default_domain(struct iommu_group *group, |
| struct device *dev); |
| 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 iommu_create_device_direct_mappings(struct iommu_group *group, |
| struct device *dev); |
| static struct iommu_group *iommu_group_get_for_dev(struct device *dev); |
| static ssize_t iommu_group_store_type(struct iommu_group *group, |
| const char *buf, size_t count); |
| |
| #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \ |
| struct iommu_group_attribute iommu_group_attr_##_name = \ |
| __ATTR(_name, _mode, _show, _store) |
| |
| #define to_iommu_group_attr(_attr) \ |
| container_of(_attr, struct iommu_group_attribute, attr) |
| #define to_iommu_group(_kobj) \ |
| container_of(_kobj, struct iommu_group, kobj) |
| |
| static LIST_HEAD(iommu_device_list); |
| static DEFINE_SPINLOCK(iommu_device_lock); |
| |
| /* |
| * 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"; |
| default: |
| return "Unknown"; |
| } |
| } |
| |
| static int __init iommu_subsys_init(void) |
| { |
| 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)" : ""); |
| |
| return 0; |
| } |
| subsys_initcall(iommu_subsys_init); |
| |
| /** |
| * 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) |
| { |
| /* 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 = hwdev->fwnode; |
| |
| spin_lock(&iommu_device_lock); |
| list_add_tail(&iommu->list, &iommu_device_list); |
| spin_unlock(&iommu_device_lock); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iommu_device_register); |
| |
| void iommu_device_unregister(struct iommu_device *iommu) |
| { |
| spin_lock(&iommu_device_lock); |
| list_del(&iommu->list); |
| spin_unlock(&iommu_device_lock); |
| } |
| EXPORT_SYMBOL_GPL(iommu_device_unregister); |
| |
| static struct dev_iommu *dev_iommu_get(struct device *dev) |
| { |
| struct dev_iommu *param = dev->iommu; |
| |
| if (param) |
| return param; |
| |
| param = kzalloc(sizeof(*param), GFP_KERNEL); |
| if (!param) |
| return NULL; |
| |
| mutex_init(¶m->lock); |
| dev->iommu = param; |
| return param; |
| } |
| |
| static void dev_iommu_free(struct device *dev) |
| { |
| iommu_fwspec_free(dev); |
| kfree(dev->iommu); |
| dev->iommu = NULL; |
| } |
| |
| static int __iommu_probe_device(struct device *dev, struct list_head *group_list) |
| { |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| struct iommu_device *iommu_dev; |
| struct iommu_group *group; |
| int ret; |
| |
| if (!ops) |
| return -ENODEV; |
| |
| 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 out_module_put; |
| } |
| |
| dev->iommu->iommu_dev = iommu_dev; |
| |
| group = iommu_group_get_for_dev(dev); |
| if (IS_ERR(group)) { |
| ret = PTR_ERR(group); |
| goto out_release; |
| } |
| iommu_group_put(group); |
| |
| if (group_list && !group->default_domain && list_empty(&group->entry)) |
| list_add_tail(&group->entry, group_list); |
| |
| iommu_device_link(iommu_dev, dev); |
| |
| return 0; |
| |
| out_release: |
| ops->release_device(dev); |
| |
| out_module_put: |
| module_put(ops->owner); |
| |
| err_free: |
| dev_iommu_free(dev); |
| |
| return ret; |
| } |
| |
| int iommu_probe_device(struct device *dev) |
| { |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| struct iommu_group *group; |
| int ret; |
| |
| ret = __iommu_probe_device(dev, NULL); |
| if (ret) |
| goto err_out; |
| |
| group = iommu_group_get(dev); |
| if (!group) { |
| ret = -ENODEV; |
| goto err_release; |
| } |
| |
| /* |
| * Try to allocate a default domain - needs support from the |
| * IOMMU driver. There are still some drivers which don't |
| * support default domains, so the return value is not yet |
| * checked. |
| */ |
| mutex_lock(&group->mutex); |
| iommu_alloc_default_domain(group, dev); |
| mutex_unlock(&group->mutex); |
| |
| if (group->default_domain) { |
| ret = __iommu_attach_device(group->default_domain, dev); |
| if (ret) { |
| iommu_group_put(group); |
| goto err_release; |
| } |
| } |
| |
| iommu_create_device_direct_mappings(group, dev); |
| |
| iommu_group_put(group); |
| |
| if (ops->probe_finalize) |
| ops->probe_finalize(dev); |
| |
| return 0; |
| |
| err_release: |
| iommu_release_device(dev); |
| |
| err_out: |
| return ret; |
| |
| } |
| |
| void iommu_release_device(struct device *dev) |
| { |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| |
| if (!dev->iommu) |
| return; |
| |
| iommu_device_unlink(dev->iommu->iommu_dev, dev); |
| |
| ops->release_device(dev); |
| |
| iommu_group_remove_device(dev); |
| module_put(ops->owner); |
| 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 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 |
| * |
| * 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); |
| 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); |
| 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 ssize_t iommu_group_show_type(struct iommu_group *group, |
| char *buf) |
| { |
| char *type = "unknown\n"; |
| |
| mutex_lock(&group->mutex); |
| if (group->default_domain) { |
| switch (group->default_domain->type) { |
| case IOMMU_DOMAIN_BLOCKED: |
| type = "blocked\n"; |
| break; |
| case IOMMU_DOMAIN_IDENTITY: |
| type = "identity\n"; |
| break; |
| case IOMMU_DOMAIN_UNMANAGED: |
| type = "unmanaged\n"; |
| break; |
| case IOMMU_DOMAIN_DMA: |
| type = "DMA\n"; |
| break; |
| case IOMMU_DOMAIN_DMA_FQ: |
| type = "DMA-FQ\n"; |
| break; |
| } |
| } |
| mutex_unlock(&group->mutex); |
| strcpy(buf, type); |
| |
| return strlen(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_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 |
| * |
| * 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); |
| 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); |
| 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) |
| return ERR_PTR(ret); |
| |
| ret = iommu_group_create_file(group, &iommu_group_attr_type); |
| 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_create_device_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 || !iommu_is_dma_domain(domain)) |
| 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; |
| size_t map_size = 0; |
| |
| 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 && |
| entry->type != IOMMU_RESV_DIRECT_RELAXABLE) |
| continue; |
| |
| 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); |
| if (ret) |
| goto out; |
| map_size = 0; |
| } |
| } |
| |
| } |
| |
| iommu_flush_iotlb_all(domain); |
| |
| out: |
| iommu_put_resv_regions(dev, &mappings); |
| |
| return ret; |
| } |
| |
| static bool iommu_is_attach_deferred(struct iommu_domain *domain, |
| struct device *dev) |
| { |
| if (domain->ops->is_attach_deferred) |
| return domain->ops->is_attach_deferred(domain, dev); |
| |
| return false; |
| } |
| |
| /** |
| * 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; |
| |
| mutex_lock(&group->mutex); |
| list_add_tail(&device->list, &group->devices); |
| if (group->domain && !iommu_is_attach_deferred(group->domain, dev)) |
| 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); |
| |
| dev_info(dev, "Adding to iommu group %d\n", 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); |
| sysfs_remove_link(group->devices_kobj, device->name); |
| 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 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; |
| |
| if (!group) |
| return; |
| |
| dev_info(dev, "Removing from iommu group %d\n", 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; |
| } |
| 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_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_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(¶m->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(¶m->fault_param->lock); |
| INIT_LIST_HEAD(¶m->fault_param->faults); |
| |
| done_unlock: |
| mutex_unlock(¶m->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(¶m->lock); |
| |
| if (!param->fault_param) |
| goto unlock; |
| |
| /* we cannot unregister handler if there are pending faults */ |
| if (!list_empty(¶m->fault_param->faults)) { |
| ret = -EBUSY; |
| goto unlock; |
| } |
| |
| kfree(param->fault_param); |
| param->fault_param = NULL; |
| put_device(dev); |
| unlock: |
| mutex_unlock(¶m->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(¶m->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(¶m->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; |
| bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID; |
| struct iommu_domain *domain = iommu_get_domain_for_dev(dev); |
| |
| if (!domain || !domain->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(¶m->fault_param->lock); |
| if (list_empty(¶m->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, ¶m->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 = domain->ops->page_response(dev, evt, msg); |
| list_del(&evt->list); |
| kfree(evt); |
| break; |
| } |
| |
| done_unlock: |
| mutex_unlock(¶m->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); |
| |
| /* |
| * 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 int iommu_get_def_domain_type(struct device *dev) |
| { |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| |
| if (dev_is_pci(dev) && to_pci_dev(dev)->untrusted) |
| return IOMMU_DOMAIN_DMA; |
| |
| if (ops->def_domain_type) |
| return ops->def_domain_type(dev); |
| |
| return 0; |
| } |
| |
| static int iommu_group_alloc_default_domain(struct bus_type *bus, |
| struct iommu_group *group, |
| unsigned int type) |
| { |
| struct iommu_domain *dom; |
| |
| dom = __iommu_domain_alloc(bus, type); |
| if (!dom && type != IOMMU_DOMAIN_DMA) { |
| dom = __iommu_domain_alloc(bus, IOMMU_DOMAIN_DMA); |
| if (dom) |
| pr_warn("Failed to allocate default IOMMU domain of type %u for group %s - Falling back to IOMMU_DOMAIN_DMA", |
| type, group->name); |
| } |
| |
| if (!dom) |
| return -ENOMEM; |
| |
| group->default_domain = dom; |
| if (!group->domain) |
| group->domain = dom; |
| return 0; |
| } |
| |
| static int iommu_alloc_default_domain(struct iommu_group *group, |
| struct device *dev) |
| { |
| unsigned int type; |
| |
| if (group->default_domain) |
| return 0; |
| |
| type = iommu_get_def_domain_type(dev) ? : iommu_def_domain_type; |
| |
| return iommu_group_alloc_default_domain(dev->bus, group, type); |
| } |
| |
| /** |
| * 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(). |
| */ |
| static struct iommu_group *iommu_group_get_for_dev(struct device *dev) |
| { |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| struct iommu_group *group; |
| int ret; |
| |
| group = iommu_group_get(dev); |
| if (group) |
| return group; |
| |
| if (!ops) |
| return ERR_PTR(-EINVAL); |
| |
| group = ops->device_group(dev); |
| if (WARN_ON_ONCE(group == NULL)) |
| return ERR_PTR(-EINVAL); |
| |
| if (IS_ERR(group)) |
| return group; |
| |
| ret = iommu_group_add_device(group, dev); |
| if (ret) |
| goto out_put_group; |
| |
| return group; |
| |
| out_put_group: |
| iommu_group_put(group); |
| |
| return ERR_PTR(ret); |
| } |
| |
| 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; |
| struct iommu_group *group; |
| int ret; |
| |
| /* Device is probed already if in a group */ |
| group = iommu_group_get(dev); |
| if (group) { |
| iommu_group_put(group); |
| return 0; |
| } |
| |
| ret = __iommu_probe_device(dev, group_list); |
| if (ret == -ENODEV) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| static int remove_iommu_group(struct device *dev, void *data) |
| { |
| iommu_release_device(dev); |
| |
| return 0; |
| } |
| |
| static int iommu_bus_notifier(struct notifier_block *nb, |
| unsigned long action, void *data) |
| { |
| unsigned long group_action = 0; |
| struct device *dev = data; |
| struct iommu_group *group; |
| |
| /* |
| * 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) { |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| struct __group_domain_type { |
| struct device *dev; |
| unsigned int type; |
| }; |
| |
| static int probe_get_default_domain_type(struct device *dev, void *data) |
| { |
| struct __group_domain_type *gtype = data; |
| unsigned int type = iommu_get_def_domain_type(dev); |
| |
| if (type) { |
| if (gtype->type && gtype->type != type) { |
| dev_warn(dev, "Device needs domain type %s, but device %s in the same iommu group requires type %s - using default\n", |
| iommu_domain_type_str(type), |
| dev_name(gtype->dev), |
| iommu_domain_type_str(gtype->type)); |
| gtype->type = 0; |
| } |
| |
| if (!gtype->dev) { |
| gtype->dev = dev; |
| gtype->type = type; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void probe_alloc_default_domain(struct bus_type *bus, |
| struct iommu_group *group) |
| { |
| struct __group_domain_type gtype; |
| |
| memset(>ype, 0, sizeof(gtype)); |
| |
| /* Ask for default domain requirements of all devices in the group */ |
| __iommu_group_for_each_dev(group, >ype, |
| probe_get_default_domain_type); |
| |
| if (!gtype.type) |
| gtype.type = iommu_def_domain_type; |
| |
| iommu_group_alloc_default_domain(bus, group, gtype.type); |
| |
| } |
| |
| static int iommu_group_do_dma_attach(struct device *dev, void *data) |
| { |
| struct iommu_domain *domain = data; |
| int ret = 0; |
| |
| if (!iommu_is_attach_deferred(domain, dev)) |
| ret = __iommu_attach_device(domain, dev); |
| |
| return ret; |
| } |
| |
| static int __iommu_group_dma_attach(struct iommu_group *group) |
| { |
| return __iommu_group_for_each_dev(group, group->default_domain, |
| iommu_group_do_dma_attach); |
| } |
| |
| static int iommu_group_do_probe_finalize(struct device *dev, void *data) |
| { |
| struct iommu_domain *domain = data; |
| |
| if (domain->ops->probe_finalize) |
| domain->ops->probe_finalize(dev); |
| |
| return 0; |
| } |
| |
| static void __iommu_group_dma_finalize(struct iommu_group *group) |
| { |
| __iommu_group_for_each_dev(group, group->default_domain, |
| iommu_group_do_probe_finalize); |
| } |
| |
| static int iommu_do_create_direct_mappings(struct device *dev, void *data) |
| { |
| struct iommu_group *group = data; |
| |
| iommu_create_device_direct_mappings(group, dev); |
| |
| return 0; |
| } |
| |
| static int iommu_group_create_direct_mappings(struct iommu_group *group) |
| { |
| return __iommu_group_for_each_dev(group, group, |
| iommu_do_create_direct_mappings); |
| } |
| |
| int bus_iommu_probe(struct bus_type *bus) |
| { |
| struct iommu_group *group, *next; |
| LIST_HEAD(group_list); |
| int ret; |
| |
| /* |
| * This code-path does not allocate the default domain when |
| * creating the iommu group, so do it after the groups are |
| * created. |
| */ |
| 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) { |
| /* Remove item from the list */ |
| list_del_init(&group->entry); |
| |
| mutex_lock(&group->mutex); |
| |
| /* Try to allocate default domain */ |
| probe_alloc_default_domain(bus, group); |
| |
| if (!group->default_domain) { |
| mutex_unlock(&group->mutex); |
| continue; |
| } |
| |
| iommu_group_create_direct_mappings(group); |
| |
| ret = __iommu_group_dma_attach(group); |
| |
| mutex_unlock(&group->mutex); |
| |
| if (ret) |
| break; |
| |
| __iommu_group_dma_finalize(group); |
| } |
| |
| return ret; |
| } |
| |
| static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) |
| { |
| struct notifier_block *nb; |
| int err; |
| |
| 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_iommu_probe(bus); |
| if (err) |
| goto out_err; |
| |
| |
| return 0; |
| |
| out_err: |
| /* Clean up */ |
| bus_for_each_dev(bus, NULL, NULL, 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 (ops == NULL) { |
| bus->iommu_ops = NULL; |
| return 0; |
| } |
| |
| 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; |
| |
| if (iommu_is_dma_domain(domain) && iommu_get_dma_cookie(domain)) { |
| iommu_domain_free(domain); |
| domain = NULL; |
| } |
| 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) |
| { |
| iommu_put_dma_cookie(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); |
| if (!group) |
| return -ENODEV; |
| |
| /* |
| * Lock the group to make sure the device-count doesn't |
| * change while we are attaching |
| */ |
| mutex_lock(&group->mutex); |
| ret = -EINVAL; |
| if (iommu_group_device_count(group) != 1) |
| goto out_unlock; |
| |
| ret = __iommu_attach_group(domain, group); |
| |
| out_unlock: |
| mutex_unlock(&group->mutex); |
| iommu_group_put(group); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(iommu_attach_device); |
| |
| int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain) |
| { |
| const struct iommu_ops *ops = domain->ops; |
| |
| if (ops->is_attach_deferred && ops->is_attach_deferred(domain, dev)) |
| return __iommu_attach_device(domain, dev); |
| |
| return 0; |
| } |
| |
| /* |
| * Check flags and other user provided data for valid combinations. We also |
| * make sure no reserved fields or unused flags are set. This is to ensure |
| * not breaking userspace in the future when these fields or flags are used. |
| */ |
| static int iommu_check_cache_invl_data(struct iommu_cache_invalidate_info *info) |
| { |
| u32 mask; |
| int i; |
| |
| if (info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1) |
| return -EINVAL; |
| |
| mask = (1 << IOMMU_CACHE_INV_TYPE_NR) - 1; |
| if (info->cache & ~mask) |
| return -EINVAL; |
| |
| if (info->granularity >= IOMMU_INV_GRANU_NR) |
| return -EINVAL; |
| |
| switch (info->granularity) { |
| case IOMMU_INV_GRANU_ADDR: |
| if (info->cache & IOMMU_CACHE_INV_TYPE_PASID) |
| return -EINVAL; |
| |
| mask = IOMMU_INV_ADDR_FLAGS_PASID | |
| IOMMU_INV_ADDR_FLAGS_ARCHID | |
| IOMMU_INV_ADDR_FLAGS_LEAF; |
| |
| if (info->granu.addr_info.flags & ~mask) |
| return -EINVAL; |
| break; |
| case IOMMU_INV_GRANU_PASID: |
| mask = IOMMU_INV_PASID_FLAGS_PASID | |
| IOMMU_INV_PASID_FLAGS_ARCHID; |
| if (info->granu.pasid_info.flags & ~mask) |
| return -EINVAL; |
| |
| break; |
| case IOMMU_INV_GRANU_DOMAIN: |
| if (info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB) |
| return -EINVAL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| /* Check reserved padding fields */ |
| for (i = 0; i < sizeof(info->padding); i++) { |
| if (info->padding[i]) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| int iommu_uapi_cache_invalidate(struct iommu_domain *domain, struct device *dev, |
| void __user *uinfo) |
| { |
| struct iommu_cache_invalidate_info inv_info = { 0 }; |
| u32 minsz; |
| int ret; |
| |
| if (unlikely(!domain->ops->cache_invalidate)) |
| return -ENODEV; |
| |
| /* |
| * No new spaces can be added before the variable sized union, the |
| * minimum size is the offset to the union. |
| */ |
| minsz = offsetof(struct iommu_cache_invalidate_info, granu); |
| |
| /* Copy minsz from user to get flags and argsz */ |
| if (copy_from_user(&inv_info, uinfo, minsz)) |
| return -EFAULT; |
| |
| /* Fields before the variable size union are mandatory */ |
| if (inv_info.argsz < minsz) |
| return -EINVAL; |
| |
| /* PASID and address granu require additional info beyond minsz */ |
| if (inv_info.granularity == IOMMU_INV_GRANU_PASID && |
| inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.pasid_info)) |
| return -EINVAL; |
| |
| if (inv_info.granularity == IOMMU_INV_GRANU_ADDR && |
| inv_info.argsz < offsetofend(struct iommu_cache_invalidate_info, granu.addr_info)) |
| return -EINVAL; |
| |
| /* |
| * User might be using a newer UAPI header which has a larger data |
| * size, we shall support the existing flags within the current |
| * size. Copy the remaining user data _after_ minsz but not more |
| * than the current kernel supported size. |
| */ |
| if (copy_from_user((void *)&inv_info + minsz, uinfo + minsz, |
| min_t(u32, inv_info.argsz, sizeof(inv_info)) - minsz)) |
| return -EFAULT; |
| |
| /* Now the argsz is validated, check the content */ |
| ret = iommu_check_cache_invl_data(&inv_info); |
| if (ret) |
| return ret; |
| |
| return domain->ops->cache_invalidate(domain, dev, &inv_info); |
| } |
| EXPORT_SYMBOL_GPL(iommu_uapi_cache_invalidate); |
| |
| static int iommu_check_bind_data(struct iommu_gpasid_bind_data *data) |
| { |
| u64 mask; |
| int i; |
| |
| if (data->version != IOMMU_GPASID_BIND_VERSION_1) |
| return -EINVAL; |
| |
| /* Check the range of supported formats */ |
| if (data->format >= IOMMU_PASID_FORMAT_LAST) |
| return -EINVAL; |
| |
| /* Check all flags */ |
| mask = IOMMU_SVA_GPASID_VAL; |
| if (data->flags & ~mask) |
| return -EINVAL; |
| |
| /* Check reserved padding fields */ |
| for (i = 0; i < sizeof(data->padding); i++) { |
| if (data->padding[i]) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int iommu_sva_prepare_bind_data(void __user *udata, |
| struct iommu_gpasid_bind_data *data) |
| { |
| u32 minsz; |
| |
| /* |
| * No new spaces can be added before the variable sized union, the |
| * minimum size is the offset to the union. |
| */ |
| minsz = offsetof(struct iommu_gpasid_bind_data, vendor); |
| |
| /* Copy minsz from user to get flags and argsz */ |
| if (copy_from_user(data, udata, minsz)) |
| return -EFAULT; |
| |
| /* Fields before the variable size union are mandatory */ |
| if (data->argsz < minsz) |
| return -EINVAL; |
| /* |
| * User might be using a newer UAPI header, we shall let IOMMU vendor |
| * driver decide on what size it needs. Since the guest PASID bind data |
| * can be vendor specific, larger argsz could be the result of extension |
| * for one vendor but it should not affect another vendor. |
| * Copy the remaining user data _after_ minsz |
| */ |
| if (copy_from_user((void *)data + minsz, udata + minsz, |
| min_t(u32, data->argsz, sizeof(*data)) - minsz)) |
| return -EFAULT; |
| |
| return iommu_check_bind_data(data); |
| } |
| |
| int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain, struct device *dev, |
| void __user *udata) |
| { |
| struct iommu_gpasid_bind_data data = { 0 }; |
| int ret; |
| |
| if (unlikely(!domain->ops->sva_bind_gpasid)) |
| return -ENODEV; |
| |
| ret = iommu_sva_prepare_bind_data(udata, &data); |
| if (ret) |
| return ret; |
| |
| return domain->ops->sva_bind_gpasid(domain, dev, &data); |
| } |
| EXPORT_SYMBOL_GPL(iommu_uapi_sva_bind_gpasid); |
| |
| int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, |
| ioasid_t pasid) |
| { |
| if (unlikely(!domain->ops->sva_unbind_gpasid)) |
| return -ENODEV; |
| |
| return domain->ops->sva_unbind_gpasid(dev, pasid); |
| } |
| EXPORT_SYMBOL_GPL(iommu_sva_unbind_gpasid); |
| |
| int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, |
| void __user *udata) |
| { |
| struct iommu_gpasid_bind_data data = { 0 }; |
| int ret; |
| |
| if (unlikely(!domain->ops->sva_bind_gpasid)) |
| return -ENODEV; |
| |
| ret = iommu_sva_prepare_bind_data(udata, &data); |
| if (ret) |
| return ret; |
| |
| return iommu_sva_unbind_gpasid(domain, dev, data.hpasid); |
| } |
| EXPORT_SYMBOL_GPL(iommu_uapi_sva_unbind_gpasid); |
| |
| static void __iommu_detach_device(struct iommu_domain *domain, |
| struct device *dev) |
| { |
| if (iommu_is_attach_deferred(domain, dev)) |
| return; |
| |
| if (unlikely(domain->ops->detach_dev == NULL)) |
| return; |
| |
| domain->ops->detach_dev(domain, dev); |
| trace_detach_device_from_domain(dev); |
| } |
| |
| void iommu_detach_device(struct iommu_domain *domain, struct device *dev) |
| { |
| struct iommu_group *group; |
| |
| group = iommu_group_get(dev); |
| if (!group) |
| return; |
| |
| mutex_lock(&group->mutex); |
| if (iommu_group_device_count(group) != 1) { |
| WARN_ON(1); |
| goto out_unlock; |
| } |
| |
| __iommu_detach_group(domain, group); |
| |
| out_unlock: |
| mutex_unlock(&group->mutex); |
| iommu_group_put(group); |
| } |
| EXPORT_SYMBOL_GPL(iommu_detach_device); |
| |
| struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) |
| { |
| struct iommu_domain *domain; |
| struct iommu_group *group; |
| |
| group = iommu_group_get(dev); |
| if (!group) |
| return NULL; |
| |
| domain = group->domain; |
| |
| iommu_group_put(group); |
| |
| return domain; |
| } |
| EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * 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_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 (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_pages(struct iommu_domain *domain, unsigned long iova, |
| phys_addr_t paddr, size_t size, int prot, |
| gfp_t gfp, size_t *mapped) |
| { |
| const struct iommu_ops *ops = domain->ops; |
| size_t pgsize, count; |
| int ret; |
| |
| 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); |
| |
| if (ops->map_pages) { |
| ret = ops->map_pages(domain, iova, paddr, pgsize, count, prot, |
| gfp, mapped); |
| } else { |
| ret = ops->map(domain, iova, paddr, pgsize, prot, gfp); |
| *mapped = ret ? 0 : pgsize; |
| } |
| |
| return ret; |
| } |
| |
| 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_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(!(ops->map || ops->map_pages) || |
| 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 mapped = 0; |
| |
| ret = __iommu_map_pages(domain, iova, paddr, size, 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; |
| } |
| |
| 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_ops *ops = domain->ops; |
| int ret; |
| |
| ret = __iommu_map(domain, iova, paddr, size, prot, gfp); |
| if (ret == 0 && ops->iotlb_sync_map) |
| ops->iotlb_sync_map(domain, iova, size); |
| |
| return ret; |
| } |
| |
| int iommu_map(struct iommu_domain *domain, unsigned long iova, |
| phys_addr_t paddr, size_t size, int prot) |
| { |
| might_sleep(); |
| return _iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL); |
| } |
| EXPORT_SYMBOL_GPL(iommu_map); |
| |
| int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, |
| phys_addr_t paddr, size_t size, int prot) |
| { |
| return _iommu_map(domain, iova, paddr, size, prot, GFP_ATOMIC); |
| } |
| EXPORT_SYMBOL_GPL(iommu_map_atomic); |
| |
| static size_t __iommu_unmap_pages(struct iommu_domain *domain, |
| unsigned long iova, size_t size, |
| struct iommu_iotlb_gather *iotlb_gather) |
| { |
| const struct iommu_ops *ops = domain->ops; |
| size_t pgsize, count; |
| |
| pgsize = iommu_pgsize(domain, iova, iova, size, &count); |
| return ops->unmap_pages ? |
| ops->unmap_pages(domain, iova, pgsize, count, iotlb_gather) : |
| ops->unmap(domain, iova, pgsize, iotlb_gather); |
| } |
| |
| static size_t __iommu_unmap(struct iommu_domain *domain, |
| unsigned long iova, size_t size, |
| struct iommu_iotlb_gather *iotlb_gather) |
| { |
| const struct iommu_ops *ops = domain->ops; |
| size_t unmapped_page, unmapped = 0; |
| unsigned long orig_iova = iova; |
| unsigned int min_pagesz; |
| |
| if (unlikely(!(ops->unmap || ops->unmap_pages) || |
| domain->pgsize_bitmap == 0UL)) |
| return 0; |
| |
| if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING))) |
| return 0; |
| |
| /* find out the minimum page size supported */ |
| min_pagesz = 1 << __ffs(domain->pgsize_bitmap); |
| |
| /* |
| * The virtual address, as well as the size of the mapping, must be |
| * aligned (at least) to the size of the smallest page supported |
| * by the hardware |
| */ |
| if (!IS_ALIGNED(iova | size, min_pagesz)) { |
| pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n", |
| iova, size, min_pagesz); |
| return 0; |
| } |
| |
| pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size); |
| |
| /* |
| * Keep iterating until we either unmap 'size' bytes (or more) |
| * or we hit an area that isn't mapped. |
| */ |
| while (unmapped < size) { |
| unmapped_page = __iommu_unmap_pages(domain, iova, |
| size - unmapped, |
| 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); |
| |
| static 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_ops *ops = domain->ops; |
| size_t len = 0, mapped = 0; |
| phys_addr_t start; |
| unsigned int i = 0; |
| int ret; |
| |
| 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 (len) { |
| len += sg->length; |
| } else { |
| len = sg->length; |
| start = s_phys; |
| } |
| |
| if (++i < nents) |
| sg = sg_next(sg); |
| } |
| |
| if (ops->iotlb_sync_map) |
| ops->iotlb_sync_map(domain, iova, mapped); |
| return mapped; |
| |
| out_err: |
| /* undo mappings already done */ |
| iommu_unmap(domain, iova, mapped); |
| |
| return ret; |
| } |
| |
| ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, |
| struct scatterlist *sg, unsigned int nents, int prot) |
| { |
| might_sleep(); |
| return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_KERNEL); |
| } |
| EXPORT_SYMBOL_GPL(iommu_map_sg); |
| |
| ssize_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova, |
| struct scatterlist *sg, unsigned int nents, int prot) |
| { |
| return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC); |
| } |
| |
| /** |
| * 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); |
| |
| 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); |
| } |
| |
| /** |
| * generic_iommu_put_resv_regions - Reserved region driver helper |
| * @dev: device for which to free reserved regions |
| * @list: reserved region list for device |
| * |
| * IOMMU drivers can use this to implement their .put_resv_regions() callback |
| * for simple reservations. Memory allocated for each reserved region will be |
| * freed. If an IOMMU driver allocates additional resources per region, it is |
| * going to have to implement a custom callback. |
| */ |
| void generic_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) |
| kfree(entry); |
| } |
| EXPORT_SYMBOL(generic_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) |
| { |
| 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; |
| } |
| 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->iommu && dev->iommu->iommu_dev) { |
| const struct iommu_ops *ops = dev->iommu->iommu_dev->ops; |
| |
| 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. |
| * For example, before disabling the aux-domain feature, the device driver |
| * should detach all aux-domains. Otherwise, this will return -EBUSY. |
| */ |
| int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) |
| { |
| if (dev->iommu && dev->iommu->iommu_dev) { |
| const struct iommu_ops *ops = dev->iommu->iommu_dev->ops; |
| |
| if (ops->dev_disable_feat) |
| return ops->dev_disable_feat(dev, feat); |
| } |
| |
| return -EBUSY; |
| } |
| EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); |
| |
| bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat) |
| { |
| if (dev->iommu && dev->iommu->iommu_dev) { |
| const struct iommu_ops *ops = dev->iommu->iommu_dev->ops; |
| |
| if (ops->dev_feat_enabled) |
| return ops->dev_feat_enabled(dev, feat); |
| } |
| |
| return false; |
| } |
| EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled); |
| |
| /* |
| * Aux-domain specific attach/detach. |
| * |
| * Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns |
| * true. Also, as long as domains are attached to a device through this |
| * interface, any tries to call iommu_attach_device() should fail |
| * (iommu_detach_device() can't fail, so we fail when trying to re-attach). |
| * This should make us safe against a device being attached to a guest as a |
| * whole while there are still pasid users on it (aux and sva). |
| */ |
| int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev) |
| { |
| int ret = -ENODEV; |
| |
| if (domain->ops->aux_attach_dev) |
| ret = domain->ops->aux_attach_dev(domain, dev); |
| |
| if (!ret) |
| trace_attach_device_to_domain(dev); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(iommu_aux_attach_device); |
| |
| void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev) |
| { |
| if (domain->ops->aux_detach_dev) { |
| domain->ops->aux_detach_dev(domain, dev); |
| trace_detach_device_from_domain(dev); |
| } |
| } |
| EXPORT_SYMBOL_GPL(iommu_aux_detach_device); |
| |
| int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev) |
| { |
| int ret = -ENODEV; |
| |
| if (domain->ops->aux_get_pasid) |
| ret = domain->ops->aux_get_pasid(domain, dev); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(iommu_aux_get_pasid); |
| |
| /** |
| * iommu_sva_bind_device() - Bind a process address space to a device |
| * @dev: the device |
| * @mm: the mm to bind, caller must hold a reference to it |
| * |
| * Create a bond between device and address space, allowing the device to access |
| * the mm using the returned PASID. If a bond already exists between @device and |
| * @mm, it is returned and an additional reference is taken. Caller must call |
| * iommu_sva_unbind_device() to release each reference. |
| * |
| * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to |
| * initialize the required SVA features. |
| * |
| * On error, returns an ERR_PTR value. |
| */ |
| struct iommu_sva * |
| iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) |
| { |
| struct iommu_group *group; |
| struct iommu_sva *handle = ERR_PTR(-EINVAL); |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| |
| if (!ops || !ops->sva_bind) |
| return ERR_PTR(-ENODEV); |
| |
| group = iommu_group_get(dev); |
| if (!group) |
| return ERR_PTR(-ENODEV); |
| |
| /* Ensure device count and domain don't change while we're binding */ |
| mutex_lock(&group->mutex); |
| |
| /* |
| * To keep things simple, SVA currently doesn't support IOMMU groups |
| * with more than one device. Existing SVA-capable systems are not |
| * affected by the problems that required IOMMU groups (lack of ACS |
| * isolation, device ID aliasing and other hardware issues). |
| */ |
| if (iommu_group_device_count(group) != 1) |
| goto out_unlock; |
| |
| handle = ops->sva_bind(dev, mm, drvdata); |
| |
| out_unlock: |
| mutex_unlock(&group->mutex); |
| iommu_group_put(group); |
| |
| return handle; |
| } |
| EXPORT_SYMBOL_GPL(iommu_sva_bind_device); |
| |
| /** |
| * iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device |
| * @handle: the handle returned by iommu_sva_bind_device() |
| * |
| * Put reference to a bond between device and address space. The device should |
| * not be issuing any more transaction for this PASID. All outstanding page |
| * requests for this PASID must have been flushed to the IOMMU. |
| */ |
| void iommu_sva_unbind_device(struct iommu_sva *handle) |
| { |
| struct iommu_group *group; |
| struct device *dev = handle->dev; |
| const struct iommu_ops *ops = dev->bus->iommu_ops; |
| |
| if (!ops || !ops->sva_unbind) |
| return; |
| |
| group = iommu_group_get(dev); |
| if (!group) |
| return; |
| |
| mutex_lock(&group->mutex); |
| ops->sva_unbind(handle); |
| mutex_unlock(&group->mutex); |
| |
| iommu_group_put(group); |
| } |
| EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); |
| |
| u32 iommu_sva_get_pasid(struct iommu_sva *handle) |
| { |
| const struct iommu_ops *ops = handle->dev->bus->iommu_ops; |
| |
| if (!ops || !ops->sva_get_pasid) |
| return IOMMU_PASID_INVALID; |
| |
| return ops->sva_get_pasid(handle); |
| } |
| EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); |
| |
| /* |
| * Changes the default domain of an iommu group that has *only* one device |
| * |
| * @group: The group for which the default domain should be changed |
| * @prev_dev: The device in the group (this is used to make sure that the device |
| * hasn't changed after the caller has called this function) |
| * @type: The type of the new default domain that gets associated with the group |
| * |
| * Returns 0 on success and error code on failure |
| * |
| * Note: |
| * 1. Presently, this function is called only when user requests to change the |
| * group's default domain type through /sys/kernel/iommu_groups/<grp_id>/type |
| * Please take a closer look if intended to use for other purposes. |
| */ |
| static int iommu_change_dev_def_domain(struct iommu_group *group, |
| struct device *prev_dev, int type) |
| { |
| struct iommu_domain *prev_dom; |
| struct group_device *grp_dev; |
| int ret, dev_def_dom; |
| struct device *dev; |
| |
| mutex_lock(&group->mutex); |
| |
| if (group->default_domain != group->domain) { |
| dev_err_ratelimited(prev_dev, "Group not assigned to default domain\n"); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| /* |
| * iommu group wasn't locked while acquiring device lock in |
| * iommu_group_store_type(). So, make sure that the device count hasn't |
| * changed while acquiring device lock. |
| * |
| * Changing default domain of an iommu group with two or more devices |
| * isn't supported because there could be a potential deadlock. Consider |
| * the following scenario. T1 is trying to acquire device locks of all |
| * the devices in the group and before it could acquire all of them, |
| * there could be another thread T2 (from different sub-system and use |
| * case) that has already acquired some of the device locks and might be |
| * waiting for T1 to release other device locks. |
| */ |
| if (iommu_group_device_count(group) != 1) { |
| dev_err_ratelimited(prev_dev, "Cannot change default domain: Group has more than one device\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* Since group has only one device */ |
| grp_dev = list_first_entry(&group->devices, struct group_device, list); |
| dev = grp_dev->dev; |
| |
| if (prev_dev != dev) { |
| dev_err_ratelimited(prev_dev, "Cannot change default domain: Device has been changed\n"); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| prev_dom = group->default_domain; |
| if (!prev_dom) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| dev_def_dom = iommu_get_def_domain_type(dev); |
| if (!type) { |
| /* |
| * If the user hasn't requested any specific type of domain and |
| * if the device supports both the domains, then default to the |
| * domain the device was booted with |
| */ |
| type = dev_def_dom ? : iommu_def_domain_type; |
| } else if (dev_def_dom && type != dev_def_dom) { |
| dev_err_ratelimited(prev_dev, "Device cannot be in %s domain\n", |
| iommu_domain_type_str(type)); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* |
| * Switch to a new domain only if the requested domain type is different |
| * from the existing default domain type |
| */ |
| if (prev_dom->type == type) { |
| ret = 0; |
| goto out; |
| } |
| |
| /* We can bring up a flush queue without tearing down the domain */ |
| if (type == IOMMU_DOMAIN_DMA_FQ && prev_dom->type == IOMMU_DOMAIN_DMA) { |
| ret = iommu_dma_init_fq(prev_dom); |
| if (!ret) |
| prev_dom->type = IOMMU_DOMAIN_DMA_FQ; |
| goto out; |
| } |
| |
| /* Sets group->default_domain to the newly allocated domain */ |
| ret = iommu_group_alloc_default_domain(dev->bus, group, type); |
| if (ret) |
| goto out; |
| |
| ret = iommu_create_device_direct_mappings(group, dev); |
| if (ret) |
| goto free_new_domain; |
| |
| ret = __iommu_attach_device(group->default_domain, dev); |
| if (ret) |
| goto free_new_domain; |
| |
| group->domain = group->default_domain; |
| |
| /* |
| * 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 */ |
| iommu_group_do_probe_finalize(dev, group->default_domain); |
| iommu_domain_free(prev_dom); |
| return 0; |
| |
| free_new_domain: |
| iommu_domain_free(group->default_domain); |
| group->default_domain = prev_dom; |
| |