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>
33 static struct kset *iommu_group_kset;
34 static struct ida iommu_group_ida;
35 static struct mutex iommu_group_mutex;
39 struct kobject *devices_kobj;
40 struct list_head devices;
42 struct blocking_notifier_head notifier;
44 void (*iommu_data_release)(void *iommu_data);
50 struct list_head list;
55 struct iommu_group_attribute {
56 struct attribute attr;
57 ssize_t (*show)(struct iommu_group *group, char *buf);
58 ssize_t (*store)(struct iommu_group *group,
59 const char *buf, size_t count);
62 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
63 struct iommu_group_attribute iommu_group_attr_##_name = \
64 __ATTR(_name, _mode, _show, _store)
66 #define to_iommu_group_attr(_attr) \
67 container_of(_attr, struct iommu_group_attribute, attr)
68 #define to_iommu_group(_kobj) \
69 container_of(_kobj, struct iommu_group, kobj)
71 static ssize_t iommu_group_attr_show(struct kobject *kobj,
72 struct attribute *__attr, char *buf)
74 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
75 struct iommu_group *group = to_iommu_group(kobj);
79 ret = attr->show(group, buf);
83 static ssize_t iommu_group_attr_store(struct kobject *kobj,
84 struct attribute *__attr,
85 const char *buf, size_t count)
87 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
88 struct iommu_group *group = to_iommu_group(kobj);
92 ret = attr->store(group, buf, count);
96 static const struct sysfs_ops iommu_group_sysfs_ops = {
97 .show = iommu_group_attr_show,
98 .store = iommu_group_attr_store,
101 static int iommu_group_create_file(struct iommu_group *group,
102 struct iommu_group_attribute *attr)
104 return sysfs_create_file(&group->kobj, &attr->attr);
107 static void iommu_group_remove_file(struct iommu_group *group,
108 struct iommu_group_attribute *attr)
110 sysfs_remove_file(&group->kobj, &attr->attr);
113 static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
115 return sprintf(buf, "%s\n", group->name);
118 static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
120 static void iommu_group_release(struct kobject *kobj)
122 struct iommu_group *group = to_iommu_group(kobj);
124 if (group->iommu_data_release)
125 group->iommu_data_release(group->iommu_data);
127 mutex_lock(&iommu_group_mutex);
128 ida_remove(&iommu_group_ida, group->id);
129 mutex_unlock(&iommu_group_mutex);
135 static struct kobj_type iommu_group_ktype = {
136 .sysfs_ops = &iommu_group_sysfs_ops,
137 .release = iommu_group_release,
141 * iommu_group_alloc - Allocate a new group
142 * @name: Optional name to associate with group, visible in sysfs
144 * This function is called by an iommu driver to allocate a new iommu
145 * group. The iommu group represents the minimum granularity of the iommu.
146 * Upon successful return, the caller holds a reference to the supplied
147 * group in order to hold the group until devices are added. Use
148 * iommu_group_put() to release this extra reference count, allowing the
149 * group to be automatically reclaimed once it has no devices or external
152 struct iommu_group *iommu_group_alloc(void)
154 struct iommu_group *group;
157 group = kzalloc(sizeof(*group), GFP_KERNEL);
159 return ERR_PTR(-ENOMEM);
161 group->kobj.kset = iommu_group_kset;
162 mutex_init(&group->mutex);
163 INIT_LIST_HEAD(&group->devices);
164 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
166 mutex_lock(&iommu_group_mutex);
169 if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) {
171 mutex_unlock(&iommu_group_mutex);
172 return ERR_PTR(-ENOMEM);
175 if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id))
178 mutex_unlock(&iommu_group_mutex);
180 ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
181 NULL, "%d", group->id);
183 mutex_lock(&iommu_group_mutex);
184 ida_remove(&iommu_group_ida, group->id);
185 mutex_unlock(&iommu_group_mutex);
190 group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
191 if (!group->devices_kobj) {
192 kobject_put(&group->kobj); /* triggers .release & free */
193 return ERR_PTR(-ENOMEM);
197 * The devices_kobj holds a reference on the group kobject, so
198 * as long as that exists so will the group. We can therefore
199 * use the devices_kobj for reference counting.
201 kobject_put(&group->kobj);
205 EXPORT_SYMBOL_GPL(iommu_group_alloc);
207 struct iommu_group *iommu_group_get_by_id(int id)
209 struct kobject *group_kobj;
210 struct iommu_group *group;
213 if (!iommu_group_kset)
216 name = kasprintf(GFP_KERNEL, "%d", id);
220 group_kobj = kset_find_obj(iommu_group_kset, name);
226 group = container_of(group_kobj, struct iommu_group, kobj);
227 BUG_ON(group->id != id);
229 kobject_get(group->devices_kobj);
230 kobject_put(&group->kobj);
234 EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
237 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
240 * iommu drivers can store data in the group for use when doing iommu
241 * operations. This function provides a way to retrieve it. Caller
242 * should hold a group reference.
244 void *iommu_group_get_iommudata(struct iommu_group *group)
246 return group->iommu_data;
248 EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
251 * iommu_group_set_iommudata - set iommu_data for a group
253 * @iommu_data: new data
254 * @release: release function for iommu_data
256 * iommu drivers can store data in the group for use when doing iommu
257 * operations. This function provides a way to set the data after
258 * the group has been allocated. Caller should hold a group reference.
260 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
261 void (*release)(void *iommu_data))
263 group->iommu_data = iommu_data;
264 group->iommu_data_release = release;
266 EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
269 * iommu_group_set_name - set name for a group
273 * Allow iommu driver to set a name for a group. When set it will
274 * appear in a name attribute file under the group in sysfs.
276 int iommu_group_set_name(struct iommu_group *group, const char *name)
281 iommu_group_remove_file(group, &iommu_group_attr_name);
288 group->name = kstrdup(name, GFP_KERNEL);
292 ret = iommu_group_create_file(group, &iommu_group_attr_name);
301 EXPORT_SYMBOL_GPL(iommu_group_set_name);
304 * iommu_group_add_device - add a device to an iommu group
305 * @group: the group into which to add the device (reference should be held)
308 * This function is called by an iommu driver to add a device into a
309 * group. Adding a device increments the group reference count.
311 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
314 struct iommu_device *device;
316 device = kzalloc(sizeof(*device), GFP_KERNEL);
322 ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
328 device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
331 sysfs_remove_link(&dev->kobj, "iommu_group");
336 ret = sysfs_create_link_nowarn(group->devices_kobj,
337 &dev->kobj, device->name);
340 if (ret == -EEXIST && i >= 0) {
342 * Account for the slim chance of collision
343 * and append an instance to the name.
345 device->name = kasprintf(GFP_KERNEL, "%s.%d",
346 kobject_name(&dev->kobj), i++);
350 sysfs_remove_link(&dev->kobj, "iommu_group");
355 kobject_get(group->devices_kobj);
357 dev->iommu_group = group;
359 mutex_lock(&group->mutex);
360 list_add_tail(&device->list, &group->devices);
361 mutex_unlock(&group->mutex);
363 /* Notify any listeners about change to group. */
364 blocking_notifier_call_chain(&group->notifier,
365 IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
368 EXPORT_SYMBOL_GPL(iommu_group_add_device);
371 * iommu_group_remove_device - remove a device from it's current group
372 * @dev: device to be removed
374 * This function is called by an iommu driver to remove the device from
375 * it's current group. This decrements the iommu group reference count.
377 void iommu_group_remove_device(struct device *dev)
379 struct iommu_group *group = dev->iommu_group;
380 struct iommu_device *tmp_device, *device = NULL;
382 /* Pre-notify listeners that a device is being removed. */
383 blocking_notifier_call_chain(&group->notifier,
384 IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
386 mutex_lock(&group->mutex);
387 list_for_each_entry(tmp_device, &group->devices, list) {
388 if (tmp_device->dev == dev) {
390 list_del(&device->list);
394 mutex_unlock(&group->mutex);
399 sysfs_remove_link(group->devices_kobj, device->name);
400 sysfs_remove_link(&dev->kobj, "iommu_group");
404 dev->iommu_group = NULL;
405 kobject_put(group->devices_kobj);
407 EXPORT_SYMBOL_GPL(iommu_group_remove_device);
410 * iommu_group_for_each_dev - iterate over each device in the group
412 * @data: caller opaque data to be passed to callback function
413 * @fn: caller supplied callback function
415 * This function is called by group users to iterate over group devices.
416 * Callers should hold a reference count to the group during callback.
417 * The group->mutex is held across callbacks, which will block calls to
418 * iommu_group_add/remove_device.
420 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
421 int (*fn)(struct device *, void *))
423 struct iommu_device *device;
426 mutex_lock(&group->mutex);
427 list_for_each_entry(device, &group->devices, list) {
428 ret = fn(device->dev, data);
432 mutex_unlock(&group->mutex);
435 EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
438 * iommu_group_get - Return the group for a device and increment reference
439 * @dev: get the group that this device belongs to
441 * This function is called by iommu drivers and users to get the group
442 * for the specified device. If found, the group is returned and the group
443 * reference in incremented, else NULL.
445 struct iommu_group *iommu_group_get(struct device *dev)
447 struct iommu_group *group = dev->iommu_group;
450 kobject_get(group->devices_kobj);
454 EXPORT_SYMBOL_GPL(iommu_group_get);
457 * iommu_group_put - Decrement group reference
458 * @group: the group to use
460 * This function is called by iommu drivers and users to release the
461 * iommu group. Once the reference count is zero, the group is released.
463 void iommu_group_put(struct iommu_group *group)
466 kobject_put(group->devices_kobj);
468 EXPORT_SYMBOL_GPL(iommu_group_put);
471 * iommu_group_register_notifier - Register a notifier for group changes
472 * @group: the group to watch
473 * @nb: notifier block to signal
475 * This function allows iommu group users to track changes in a group.
476 * See include/linux/iommu.h for actions sent via this notifier. Caller
477 * should hold a reference to the group throughout notifier registration.
479 int iommu_group_register_notifier(struct iommu_group *group,
480 struct notifier_block *nb)
482 return blocking_notifier_chain_register(&group->notifier, nb);
484 EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
487 * iommu_group_unregister_notifier - Unregister a notifier
488 * @group: the group to watch
489 * @nb: notifier block to signal
491 * Unregister a previously registered group notifier block.
493 int iommu_group_unregister_notifier(struct iommu_group *group,
494 struct notifier_block *nb)
496 return blocking_notifier_chain_unregister(&group->notifier, nb);
498 EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
501 * iommu_group_id - Return ID for a group
502 * @group: the group to ID
504 * Return the unique ID for the group matching the sysfs group number.
506 int iommu_group_id(struct iommu_group *group)
510 EXPORT_SYMBOL_GPL(iommu_group_id);
512 static int add_iommu_group(struct device *dev, void *data)
514 struct iommu_ops *ops = data;
516 if (!ops->add_device)
519 WARN_ON(dev->iommu_group);
521 ops->add_device(dev);
526 static int iommu_bus_notifier(struct notifier_block *nb,
527 unsigned long action, void *data)
529 struct device *dev = data;
530 struct iommu_ops *ops = dev->bus->iommu_ops;
531 struct iommu_group *group;
532 unsigned long group_action = 0;
535 * ADD/DEL call into iommu driver ops if provided, which may
536 * result in ADD/DEL notifiers to group->notifier
538 if (action == BUS_NOTIFY_ADD_DEVICE) {
540 return ops->add_device(dev);
541 } else if (action == BUS_NOTIFY_DEL_DEVICE) {
542 if (ops->remove_device && dev->iommu_group) {
543 ops->remove_device(dev);
549 * Remaining BUS_NOTIFYs get filtered and republished to the
550 * group, if anyone is listening
552 group = iommu_group_get(dev);
557 case BUS_NOTIFY_BIND_DRIVER:
558 group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
560 case BUS_NOTIFY_BOUND_DRIVER:
561 group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
563 case BUS_NOTIFY_UNBIND_DRIVER:
564 group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
566 case BUS_NOTIFY_UNBOUND_DRIVER:
567 group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
572 blocking_notifier_call_chain(&group->notifier,
575 iommu_group_put(group);
579 static struct notifier_block iommu_bus_nb = {
580 .notifier_call = iommu_bus_notifier,
583 static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
585 bus_register_notifier(bus, &iommu_bus_nb);
586 bus_for_each_dev(bus, NULL, ops, add_iommu_group);
590 * bus_set_iommu - set iommu-callbacks for the bus
592 * @ops: the callbacks provided by the iommu-driver
594 * This function is called by an iommu driver to set the iommu methods
595 * used for a particular bus. Drivers for devices on that bus can use
596 * the iommu-api after these ops are registered.
597 * This special function is needed because IOMMUs are usually devices on
598 * the bus itself, so the iommu drivers are not initialized when the bus
599 * is set up. With this function the iommu-driver can set the iommu-ops
602 int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops)
604 if (bus->iommu_ops != NULL)
607 bus->iommu_ops = ops;
609 /* Do IOMMU specific setup for this bus-type */
610 iommu_bus_init(bus, ops);
614 EXPORT_SYMBOL_GPL(bus_set_iommu);
616 bool iommu_present(struct bus_type *bus)
618 return bus->iommu_ops != NULL;
620 EXPORT_SYMBOL_GPL(iommu_present);
623 * iommu_set_fault_handler() - set a fault handler for an iommu domain
624 * @domain: iommu domain
625 * @handler: fault handler
626 * @token: user data, will be passed back to the fault handler
628 * This function should be used by IOMMU users which want to be notified
629 * whenever an IOMMU fault happens.
631 * The fault handler itself should return 0 on success, and an appropriate
632 * error code otherwise.
634 void iommu_set_fault_handler(struct iommu_domain *domain,
635 iommu_fault_handler_t handler,
640 domain->handler = handler;
641 domain->handler_token = token;
643 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
645 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
647 struct iommu_domain *domain;
650 if (bus == NULL || bus->iommu_ops == NULL)
653 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
657 domain->ops = bus->iommu_ops;
659 ret = domain->ops->domain_init(domain);
670 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
672 void iommu_domain_free(struct iommu_domain *domain)
674 if (likely(domain->ops->domain_destroy != NULL))
675 domain->ops->domain_destroy(domain);
679 EXPORT_SYMBOL_GPL(iommu_domain_free);
681 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
683 if (unlikely(domain->ops->attach_dev == NULL))
686 return domain->ops->attach_dev(domain, dev);
688 EXPORT_SYMBOL_GPL(iommu_attach_device);
690 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
692 if (unlikely(domain->ops->detach_dev == NULL))
695 domain->ops->detach_dev(domain, dev);
697 EXPORT_SYMBOL_GPL(iommu_detach_device);
700 * IOMMU groups are really the natrual working unit of the IOMMU, but
701 * the IOMMU API works on domains and devices. Bridge that gap by
702 * iterating over the devices in a group. Ideally we'd have a single
703 * device which represents the requestor ID of the group, but we also
704 * allow IOMMU drivers to create policy defined minimum sets, where
705 * the physical hardware may be able to distiguish members, but we
706 * wish to group them at a higher level (ex. untrusted multi-function
707 * PCI devices). Thus we attach each device.
709 static int iommu_group_do_attach_device(struct device *dev, void *data)
711 struct iommu_domain *domain = data;
713 return iommu_attach_device(domain, dev);
716 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
718 return iommu_group_for_each_dev(group, domain,
719 iommu_group_do_attach_device);
721 EXPORT_SYMBOL_GPL(iommu_attach_group);
723 static int iommu_group_do_detach_device(struct device *dev, void *data)
725 struct iommu_domain *domain = data;
727 iommu_detach_device(domain, dev);
732 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
734 iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device);
736 EXPORT_SYMBOL_GPL(iommu_detach_group);
738 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
740 if (unlikely(domain->ops->iova_to_phys == NULL))
743 return domain->ops->iova_to_phys(domain, iova);
745 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
747 int iommu_domain_has_cap(struct iommu_domain *domain,
750 if (unlikely(domain->ops->domain_has_cap == NULL))
753 return domain->ops->domain_has_cap(domain, cap);
755 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
757 static size_t iommu_pgsize(struct iommu_domain *domain,
758 unsigned long addr_merge, size_t size)
760 unsigned int pgsize_idx;
763 /* Max page size that still fits into 'size' */
764 pgsize_idx = __fls(size);
766 /* need to consider alignment requirements ? */
767 if (likely(addr_merge)) {
768 /* Max page size allowed by address */
769 unsigned int align_pgsize_idx = __ffs(addr_merge);
770 pgsize_idx = min(pgsize_idx, align_pgsize_idx);
773 /* build a mask of acceptable page sizes */
774 pgsize = (1UL << (pgsize_idx + 1)) - 1;
776 /* throw away page sizes not supported by the hardware */
777 pgsize &= domain->ops->pgsize_bitmap;
779 /* make sure we're still sane */
782 /* pick the biggest page */
783 pgsize_idx = __fls(pgsize);
784 pgsize = 1UL << pgsize_idx;
789 int iommu_map(struct iommu_domain *domain, unsigned long iova,
790 phys_addr_t paddr, size_t size, int prot)
792 unsigned long orig_iova = iova;
793 unsigned int min_pagesz;
794 size_t orig_size = size;
797 if (unlikely(domain->ops->unmap == NULL ||
798 domain->ops->pgsize_bitmap == 0UL))
801 /* find out the minimum page size supported */
802 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
805 * both the virtual address and the physical one, as well as
806 * the size of the mapping, must be aligned (at least) to the
807 * size of the smallest page supported by the hardware
809 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
810 pr_err("unaligned: iova 0x%lx pa 0x%pa size 0x%zx min_pagesz 0x%x\n",
811 iova, &paddr, size, min_pagesz);
815 pr_debug("map: iova 0x%lx pa 0x%pa size 0x%zx\n", iova, &paddr, size);
818 size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
820 pr_debug("mapping: iova 0x%lx pa 0x%pa pgsize 0x%zx\n",
821 iova, &paddr, pgsize);
823 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
832 /* unroll mapping in case something went wrong */
834 iommu_unmap(domain, orig_iova, orig_size - size);
838 EXPORT_SYMBOL_GPL(iommu_map);
840 size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
842 size_t unmapped_page, unmapped = 0;
843 unsigned int min_pagesz;
845 if (unlikely(domain->ops->unmap == NULL ||
846 domain->ops->pgsize_bitmap == 0UL))
849 /* find out the minimum page size supported */
850 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
853 * The virtual address, as well as the size of the mapping, must be
854 * aligned (at least) to the size of the smallest page supported
857 if (!IS_ALIGNED(iova | size, min_pagesz)) {
858 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
859 iova, size, min_pagesz);
863 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
866 * Keep iterating until we either unmap 'size' bytes (or more)
867 * or we hit an area that isn't mapped.
869 while (unmapped < size) {
870 size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
872 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
876 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
877 iova, unmapped_page);
879 iova += unmapped_page;
880 unmapped += unmapped_page;
885 EXPORT_SYMBOL_GPL(iommu_unmap);
888 int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
889 phys_addr_t paddr, u64 size, int prot)
891 if (unlikely(domain->ops->domain_window_enable == NULL))
894 return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
897 EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
899 void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
901 if (unlikely(domain->ops->domain_window_disable == NULL))
904 return domain->ops->domain_window_disable(domain, wnd_nr);
906 EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
908 static int __init iommu_init(void)
910 iommu_group_kset = kset_create_and_add("iommu_groups",
912 ida_init(&iommu_group_ida);
913 mutex_init(&iommu_group_mutex);
915 BUG_ON(!iommu_group_kset);
919 arch_initcall(iommu_init);
921 int iommu_domain_get_attr(struct iommu_domain *domain,
922 enum iommu_attr attr, void *data)
924 struct iommu_domain_geometry *geometry;
930 case DOMAIN_ATTR_GEOMETRY:
932 *geometry = domain->geometry;
935 case DOMAIN_ATTR_PAGING:
937 *paging = (domain->ops->pgsize_bitmap != 0UL);
939 case DOMAIN_ATTR_WINDOWS:
942 if (domain->ops->domain_get_windows != NULL)
943 *count = domain->ops->domain_get_windows(domain);
949 if (!domain->ops->domain_get_attr)
952 ret = domain->ops->domain_get_attr(domain, attr, data);
957 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
959 int iommu_domain_set_attr(struct iommu_domain *domain,
960 enum iommu_attr attr, void *data)
966 case DOMAIN_ATTR_WINDOWS:
969 if (domain->ops->domain_set_windows != NULL)
970 ret = domain->ops->domain_set_windows(domain, *count);
976 if (domain->ops->domain_set_attr == NULL)
979 ret = domain->ops->domain_set_attr(domain, attr, data);
984 EXPORT_SYMBOL_GPL(iommu_domain_set_attr);