2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #define pr_fmt(fmt) "%s: " fmt, __func__
21 #include <linux/device.h>
22 #include <linux/kernel.h>
23 #include <linux/bug.h>
24 #include <linux/types.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/iommu.h>
29 #include <linux/idr.h>
30 #include <linux/notifier.h>
31 #include <linux/err.h>
32 #include <trace/events/iommu.h>
34 static struct kset *iommu_group_kset;
35 static struct ida iommu_group_ida;
36 static struct mutex iommu_group_mutex;
40 struct kobject *devices_kobj;
41 struct list_head devices;
43 struct blocking_notifier_head notifier;
45 void (*iommu_data_release)(void *iommu_data);
51 struct list_head list;
56 struct iommu_group_attribute {
57 struct attribute attr;
58 ssize_t (*show)(struct iommu_group *group, char *buf);
59 ssize_t (*store)(struct iommu_group *group,
60 const char *buf, size_t count);
63 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
64 struct iommu_group_attribute iommu_group_attr_##_name = \
65 __ATTR(_name, _mode, _show, _store)
67 #define to_iommu_group_attr(_attr) \
68 container_of(_attr, struct iommu_group_attribute, attr)
69 #define to_iommu_group(_kobj) \
70 container_of(_kobj, struct iommu_group, kobj)
72 static ssize_t iommu_group_attr_show(struct kobject *kobj,
73 struct attribute *__attr, char *buf)
75 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
76 struct iommu_group *group = to_iommu_group(kobj);
80 ret = attr->show(group, buf);
84 static ssize_t iommu_group_attr_store(struct kobject *kobj,
85 struct attribute *__attr,
86 const char *buf, size_t count)
88 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
89 struct iommu_group *group = to_iommu_group(kobj);
93 ret = attr->store(group, buf, count);
97 static const struct sysfs_ops iommu_group_sysfs_ops = {
98 .show = iommu_group_attr_show,
99 .store = iommu_group_attr_store,
102 static int iommu_group_create_file(struct iommu_group *group,
103 struct iommu_group_attribute *attr)
105 return sysfs_create_file(&group->kobj, &attr->attr);
108 static void iommu_group_remove_file(struct iommu_group *group,
109 struct iommu_group_attribute *attr)
111 sysfs_remove_file(&group->kobj, &attr->attr);
114 static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
116 return sprintf(buf, "%s\n", group->name);
119 static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
121 static void iommu_group_release(struct kobject *kobj)
123 struct iommu_group *group = to_iommu_group(kobj);
125 if (group->iommu_data_release)
126 group->iommu_data_release(group->iommu_data);
128 mutex_lock(&iommu_group_mutex);
129 ida_remove(&iommu_group_ida, group->id);
130 mutex_unlock(&iommu_group_mutex);
136 static struct kobj_type iommu_group_ktype = {
137 .sysfs_ops = &iommu_group_sysfs_ops,
138 .release = iommu_group_release,
142 * iommu_group_alloc - Allocate a new group
143 * @name: Optional name to associate with group, visible in sysfs
145 * This function is called by an iommu driver to allocate a new iommu
146 * group. The iommu group represents the minimum granularity of the iommu.
147 * Upon successful return, the caller holds a reference to the supplied
148 * group in order to hold the group until devices are added. Use
149 * iommu_group_put() to release this extra reference count, allowing the
150 * group to be automatically reclaimed once it has no devices or external
153 struct iommu_group *iommu_group_alloc(void)
155 struct iommu_group *group;
158 group = kzalloc(sizeof(*group), GFP_KERNEL);
160 return ERR_PTR(-ENOMEM);
162 group->kobj.kset = iommu_group_kset;
163 mutex_init(&group->mutex);
164 INIT_LIST_HEAD(&group->devices);
165 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
167 mutex_lock(&iommu_group_mutex);
170 if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) {
172 mutex_unlock(&iommu_group_mutex);
173 return ERR_PTR(-ENOMEM);
176 if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id))
179 mutex_unlock(&iommu_group_mutex);
181 ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
182 NULL, "%d", group->id);
184 mutex_lock(&iommu_group_mutex);
185 ida_remove(&iommu_group_ida, group->id);
186 mutex_unlock(&iommu_group_mutex);
191 group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
192 if (!group->devices_kobj) {
193 kobject_put(&group->kobj); /* triggers .release & free */
194 return ERR_PTR(-ENOMEM);
198 * The devices_kobj holds a reference on the group kobject, so
199 * as long as that exists so will the group. We can therefore
200 * use the devices_kobj for reference counting.
202 kobject_put(&group->kobj);
206 EXPORT_SYMBOL_GPL(iommu_group_alloc);
208 struct iommu_group *iommu_group_get_by_id(int id)
210 struct kobject *group_kobj;
211 struct iommu_group *group;
214 if (!iommu_group_kset)
217 name = kasprintf(GFP_KERNEL, "%d", id);
221 group_kobj = kset_find_obj(iommu_group_kset, name);
227 group = container_of(group_kobj, struct iommu_group, kobj);
228 BUG_ON(group->id != id);
230 kobject_get(group->devices_kobj);
231 kobject_put(&group->kobj);
235 EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
238 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
241 * iommu drivers can store data in the group for use when doing iommu
242 * operations. This function provides a way to retrieve it. Caller
243 * should hold a group reference.
245 void *iommu_group_get_iommudata(struct iommu_group *group)
247 return group->iommu_data;
249 EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
252 * iommu_group_set_iommudata - set iommu_data for a group
254 * @iommu_data: new data
255 * @release: release function for iommu_data
257 * iommu drivers can store data in the group for use when doing iommu
258 * operations. This function provides a way to set the data after
259 * the group has been allocated. Caller should hold a group reference.
261 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
262 void (*release)(void *iommu_data))
264 group->iommu_data = iommu_data;
265 group->iommu_data_release = release;
267 EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
270 * iommu_group_set_name - set name for a group
274 * Allow iommu driver to set a name for a group. When set it will
275 * appear in a name attribute file under the group in sysfs.
277 int iommu_group_set_name(struct iommu_group *group, const char *name)
282 iommu_group_remove_file(group, &iommu_group_attr_name);
289 group->name = kstrdup(name, GFP_KERNEL);
293 ret = iommu_group_create_file(group, &iommu_group_attr_name);
302 EXPORT_SYMBOL_GPL(iommu_group_set_name);
305 * iommu_group_add_device - add a device to an iommu group
306 * @group: the group into which to add the device (reference should be held)
309 * This function is called by an iommu driver to add a device into a
310 * group. Adding a device increments the group reference count.
312 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
315 struct iommu_device *device;
317 device = kzalloc(sizeof(*device), GFP_KERNEL);
323 ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
329 device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
332 sysfs_remove_link(&dev->kobj, "iommu_group");
337 ret = sysfs_create_link_nowarn(group->devices_kobj,
338 &dev->kobj, device->name);
341 if (ret == -EEXIST && i >= 0) {
343 * Account for the slim chance of collision
344 * and append an instance to the name.
346 device->name = kasprintf(GFP_KERNEL, "%s.%d",
347 kobject_name(&dev->kobj), i++);
351 sysfs_remove_link(&dev->kobj, "iommu_group");
356 kobject_get(group->devices_kobj);
358 dev->iommu_group = group;
360 mutex_lock(&group->mutex);
361 list_add_tail(&device->list, &group->devices);
362 mutex_unlock(&group->mutex);
364 /* Notify any listeners about change to group. */
365 blocking_notifier_call_chain(&group->notifier,
366 IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
369 EXPORT_SYMBOL_GPL(iommu_group_add_device);
372 * iommu_group_remove_device - remove a device from it's current group
373 * @dev: device to be removed
375 * This function is called by an iommu driver to remove the device from
376 * it's current group. This decrements the iommu group reference count.
378 void iommu_group_remove_device(struct device *dev)
380 struct iommu_group *group = dev->iommu_group;
381 struct iommu_device *tmp_device, *device = NULL;
383 /* Pre-notify listeners that a device is being removed. */
384 blocking_notifier_call_chain(&group->notifier,
385 IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
387 mutex_lock(&group->mutex);
388 list_for_each_entry(tmp_device, &group->devices, list) {
389 if (tmp_device->dev == dev) {
391 list_del(&device->list);
395 mutex_unlock(&group->mutex);
400 sysfs_remove_link(group->devices_kobj, device->name);
401 sysfs_remove_link(&dev->kobj, "iommu_group");
405 dev->iommu_group = NULL;
406 kobject_put(group->devices_kobj);
408 EXPORT_SYMBOL_GPL(iommu_group_remove_device);
411 * iommu_group_for_each_dev - iterate over each device in the group
413 * @data: caller opaque data to be passed to callback function
414 * @fn: caller supplied callback function
416 * This function is called by group users to iterate over group devices.
417 * Callers should hold a reference count to the group during callback.
418 * The group->mutex is held across callbacks, which will block calls to
419 * iommu_group_add/remove_device.
421 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
422 int (*fn)(struct device *, void *))
424 struct iommu_device *device;
427 mutex_lock(&group->mutex);
428 list_for_each_entry(device, &group->devices, list) {
429 ret = fn(device->dev, data);
433 mutex_unlock(&group->mutex);
436 EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
439 * iommu_group_get - Return the group for a device and increment reference
440 * @dev: get the group that this device belongs to
442 * This function is called by iommu drivers and users to get the group
443 * for the specified device. If found, the group is returned and the group
444 * reference in incremented, else NULL.
446 struct iommu_group *iommu_group_get(struct device *dev)
448 struct iommu_group *group = dev->iommu_group;
451 kobject_get(group->devices_kobj);
455 EXPORT_SYMBOL_GPL(iommu_group_get);
458 * iommu_group_put - Decrement group reference
459 * @group: the group to use
461 * This function is called by iommu drivers and users to release the
462 * iommu group. Once the reference count is zero, the group is released.
464 void iommu_group_put(struct iommu_group *group)
467 kobject_put(group->devices_kobj);
469 EXPORT_SYMBOL_GPL(iommu_group_put);
472 * iommu_group_register_notifier - Register a notifier for group changes
473 * @group: the group to watch
474 * @nb: notifier block to signal
476 * This function allows iommu group users to track changes in a group.
477 * See include/linux/iommu.h for actions sent via this notifier. Caller
478 * should hold a reference to the group throughout notifier registration.
480 int iommu_group_register_notifier(struct iommu_group *group,
481 struct notifier_block *nb)
483 return blocking_notifier_chain_register(&group->notifier, nb);
485 EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
488 * iommu_group_unregister_notifier - Unregister a notifier
489 * @group: the group to watch
490 * @nb: notifier block to signal
492 * Unregister a previously registered group notifier block.
494 int iommu_group_unregister_notifier(struct iommu_group *group,
495 struct notifier_block *nb)
497 return blocking_notifier_chain_unregister(&group->notifier, nb);
499 EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
502 * iommu_group_id - Return ID for a group
503 * @group: the group to ID
505 * Return the unique ID for the group matching the sysfs group number.
507 int iommu_group_id(struct iommu_group *group)
511 EXPORT_SYMBOL_GPL(iommu_group_id);
513 static int add_iommu_group(struct device *dev, void *data)
515 struct iommu_ops *ops = data;
517 if (!ops->add_device)
520 WARN_ON(dev->iommu_group);
522 ops->add_device(dev);
527 static int iommu_bus_notifier(struct notifier_block *nb,
528 unsigned long action, void *data)
530 struct device *dev = data;
531 struct iommu_ops *ops = dev->bus->iommu_ops;
532 struct iommu_group *group;
533 unsigned long group_action = 0;
536 * ADD/DEL call into iommu driver ops if provided, which may
537 * result in ADD/DEL notifiers to group->notifier
539 if (action == BUS_NOTIFY_ADD_DEVICE) {
541 return ops->add_device(dev);
542 } else if (action == BUS_NOTIFY_DEL_DEVICE) {
543 if (ops->remove_device && dev->iommu_group) {
544 ops->remove_device(dev);
550 * Remaining BUS_NOTIFYs get filtered and republished to the
551 * group, if anyone is listening
553 group = iommu_group_get(dev);
558 case BUS_NOTIFY_BIND_DRIVER:
559 group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
561 case BUS_NOTIFY_BOUND_DRIVER:
562 group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
564 case BUS_NOTIFY_UNBIND_DRIVER:
565 group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
567 case BUS_NOTIFY_UNBOUND_DRIVER:
568 group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
573 blocking_notifier_call_chain(&group->notifier,
576 iommu_group_put(group);
580 static struct notifier_block iommu_bus_nb = {
581 .notifier_call = iommu_bus_notifier,
584 static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
586 bus_register_notifier(bus, &iommu_bus_nb);
587 bus_for_each_dev(bus, NULL, ops, add_iommu_group);
591 * bus_set_iommu - set iommu-callbacks for the bus
593 * @ops: the callbacks provided by the iommu-driver
595 * This function is called by an iommu driver to set the iommu methods
596 * used for a particular bus. Drivers for devices on that bus can use
597 * the iommu-api after these ops are registered.
598 * This special function is needed because IOMMUs are usually devices on
599 * the bus itself, so the iommu drivers are not initialized when the bus
600 * is set up. With this function the iommu-driver can set the iommu-ops
603 int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops)
605 if (bus->iommu_ops != NULL)
608 bus->iommu_ops = ops;
610 /* Do IOMMU specific setup for this bus-type */
611 iommu_bus_init(bus, ops);
615 EXPORT_SYMBOL_GPL(bus_set_iommu);
617 bool iommu_present(struct bus_type *bus)
619 return bus->iommu_ops != NULL;
621 EXPORT_SYMBOL_GPL(iommu_present);
624 * iommu_set_fault_handler() - set a fault handler for an iommu domain
625 * @domain: iommu domain
626 * @handler: fault handler
627 * @token: user data, will be passed back to the fault handler
629 * This function should be used by IOMMU users which want to be notified
630 * whenever an IOMMU fault happens.
632 * The fault handler itself should return 0 on success, and an appropriate
633 * error code otherwise.
635 void iommu_set_fault_handler(struct iommu_domain *domain,
636 iommu_fault_handler_t handler,
641 domain->handler = handler;
642 domain->handler_token = token;
644 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
646 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
648 struct iommu_domain *domain;
651 if (bus == NULL || bus->iommu_ops == NULL)
654 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
658 domain->ops = bus->iommu_ops;
660 ret = domain->ops->domain_init(domain);
671 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
673 void iommu_domain_free(struct iommu_domain *domain)
675 if (likely(domain->ops->domain_destroy != NULL))
676 domain->ops->domain_destroy(domain);
680 EXPORT_SYMBOL_GPL(iommu_domain_free);
682 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
684 if (unlikely(domain->ops->attach_dev == NULL))
687 return domain->ops->attach_dev(domain, dev);
689 EXPORT_SYMBOL_GPL(iommu_attach_device);
691 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
693 if (unlikely(domain->ops->detach_dev == NULL))
696 domain->ops->detach_dev(domain, dev);
698 EXPORT_SYMBOL_GPL(iommu_detach_device);
701 * IOMMU groups are really the natrual working unit of the IOMMU, but
702 * the IOMMU API works on domains and devices. Bridge that gap by
703 * iterating over the devices in a group. Ideally we'd have a single
704 * device which represents the requestor ID of the group, but we also
705 * allow IOMMU drivers to create policy defined minimum sets, where
706 * the physical hardware may be able to distiguish members, but we
707 * wish to group them at a higher level (ex. untrusted multi-function
708 * PCI devices). Thus we attach each device.
710 static int iommu_group_do_attach_device(struct device *dev, void *data)
712 struct iommu_domain *domain = data;
714 return iommu_attach_device(domain, dev);
717 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
719 return iommu_group_for_each_dev(group, domain,
720 iommu_group_do_attach_device);
722 EXPORT_SYMBOL_GPL(iommu_attach_group);
724 static int iommu_group_do_detach_device(struct device *dev, void *data)
726 struct iommu_domain *domain = data;
728 iommu_detach_device(domain, dev);
733 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
735 iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device);
737 EXPORT_SYMBOL_GPL(iommu_detach_group);
739 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
741 if (unlikely(domain->ops->iova_to_phys == NULL))
744 return domain->ops->iova_to_phys(domain, iova);
746 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
748 int iommu_domain_has_cap(struct iommu_domain *domain,
751 if (unlikely(domain->ops->domain_has_cap == NULL))
754 return domain->ops->domain_has_cap(domain, cap);
756 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
758 static size_t iommu_pgsize(struct iommu_domain *domain,
759 unsigned long addr_merge, size_t size)
761 unsigned int pgsize_idx;
764 /* Max page size that still fits into 'size' */
765 pgsize_idx = __fls(size);
767 /* need to consider alignment requirements ? */
768 if (likely(addr_merge)) {
769 /* Max page size allowed by address */
770 unsigned int align_pgsize_idx = __ffs(addr_merge);
771 pgsize_idx = min(pgsize_idx, align_pgsize_idx);
774 /* build a mask of acceptable page sizes */
775 pgsize = (1UL << (pgsize_idx + 1)) - 1;
777 /* throw away page sizes not supported by the hardware */
778 pgsize &= domain->ops->pgsize_bitmap;
780 /* make sure we're still sane */
783 /* pick the biggest page */
784 pgsize_idx = __fls(pgsize);
785 pgsize = 1UL << pgsize_idx;
790 int iommu_map(struct iommu_domain *domain, unsigned long iova,
791 phys_addr_t paddr, size_t size, int prot)
793 unsigned long orig_iova = iova;
794 unsigned int min_pagesz;
795 size_t orig_size = size;
798 if (unlikely(domain->ops->unmap == NULL ||
799 domain->ops->pgsize_bitmap == 0UL))
802 /* find out the minimum page size supported */
803 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
806 * both the virtual address and the physical one, as well as
807 * the size of the mapping, must be aligned (at least) to the
808 * size of the smallest page supported by the hardware
810 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
811 pr_err("unaligned: iova 0x%lx pa 0x%pa size 0x%zx min_pagesz 0x%x\n",
812 iova, &paddr, size, min_pagesz);
816 pr_debug("map: iova 0x%lx pa 0x%pa size 0x%zx\n", iova, &paddr, size);
819 size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
821 pr_debug("mapping: iova 0x%lx pa 0x%pa pgsize 0x%zx\n",
822 iova, &paddr, pgsize);
824 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
833 /* unroll mapping in case something went wrong */
835 iommu_unmap(domain, orig_iova, orig_size - size);
839 EXPORT_SYMBOL_GPL(iommu_map);
841 size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
843 size_t unmapped_page, unmapped = 0;
844 unsigned int min_pagesz;
846 if (unlikely(domain->ops->unmap == NULL ||
847 domain->ops->pgsize_bitmap == 0UL))
850 /* find out the minimum page size supported */
851 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
854 * The virtual address, as well as the size of the mapping, must be
855 * aligned (at least) to the size of the smallest page supported
858 if (!IS_ALIGNED(iova | size, min_pagesz)) {
859 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
860 iova, size, min_pagesz);
864 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
867 * Keep iterating until we either unmap 'size' bytes (or more)
868 * or we hit an area that isn't mapped.
870 while (unmapped < size) {
871 size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
873 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
877 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
878 iova, unmapped_page);
880 iova += unmapped_page;
881 unmapped += unmapped_page;
886 EXPORT_SYMBOL_GPL(iommu_unmap);
889 int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
890 phys_addr_t paddr, u64 size, int prot)
892 if (unlikely(domain->ops->domain_window_enable == NULL))
895 return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
898 EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
900 void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
902 if (unlikely(domain->ops->domain_window_disable == NULL))
905 return domain->ops->domain_window_disable(domain, wnd_nr);
907 EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
909 static int __init iommu_init(void)
911 iommu_group_kset = kset_create_and_add("iommu_groups",
913 ida_init(&iommu_group_ida);
914 mutex_init(&iommu_group_mutex);
916 BUG_ON(!iommu_group_kset);
920 arch_initcall(iommu_init);
922 int iommu_domain_get_attr(struct iommu_domain *domain,
923 enum iommu_attr attr, void *data)
925 struct iommu_domain_geometry *geometry;
931 case DOMAIN_ATTR_GEOMETRY:
933 *geometry = domain->geometry;
936 case DOMAIN_ATTR_PAGING:
938 *paging = (domain->ops->pgsize_bitmap != 0UL);
940 case DOMAIN_ATTR_WINDOWS:
943 if (domain->ops->domain_get_windows != NULL)
944 *count = domain->ops->domain_get_windows(domain);
950 if (!domain->ops->domain_get_attr)
953 ret = domain->ops->domain_get_attr(domain, attr, data);
958 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
960 int iommu_domain_set_attr(struct iommu_domain *domain,
961 enum iommu_attr attr, void *data)
967 case DOMAIN_ATTR_WINDOWS:
970 if (domain->ops->domain_set_windows != NULL)
971 ret = domain->ops->domain_set_windows(domain, *count);
977 if (domain->ops->domain_set_attr == NULL)
980 ret = domain->ops->domain_set_attr(domain, attr, data);
985 EXPORT_SYMBOL_GPL(iommu_domain_set_attr);