2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <jroedel@suse.de>
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) "iommu: " fmt
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 <linux/pci.h>
33 #include <linux/bitops.h>
34 #include <linux/property.h>
35 #include <trace/events/iommu.h>
37 static struct kset *iommu_group_kset;
38 static DEFINE_IDA(iommu_group_ida);
39 static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
41 struct iommu_callback_data {
42 const struct iommu_ops *ops;
47 struct kobject *devices_kobj;
48 struct list_head devices;
50 struct blocking_notifier_head notifier;
52 void (*iommu_data_release)(void *iommu_data);
55 struct iommu_domain *default_domain;
56 struct iommu_domain *domain;
60 struct list_head list;
65 struct iommu_group_attribute {
66 struct attribute attr;
67 ssize_t (*show)(struct iommu_group *group, char *buf);
68 ssize_t (*store)(struct iommu_group *group,
69 const char *buf, size_t count);
72 static const char * const iommu_group_resv_type_string[] = {
73 [IOMMU_RESV_DIRECT] = "direct",
74 [IOMMU_RESV_RESERVED] = "reserved",
75 [IOMMU_RESV_MSI] = "msi",
76 [IOMMU_RESV_SW_MSI] = "msi",
79 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
80 struct iommu_group_attribute iommu_group_attr_##_name = \
81 __ATTR(_name, _mode, _show, _store)
83 #define to_iommu_group_attr(_attr) \
84 container_of(_attr, struct iommu_group_attribute, attr)
85 #define to_iommu_group(_kobj) \
86 container_of(_kobj, struct iommu_group, kobj)
88 static LIST_HEAD(iommu_device_list);
89 static DEFINE_SPINLOCK(iommu_device_lock);
91 int iommu_device_register(struct iommu_device *iommu)
93 spin_lock(&iommu_device_lock);
94 list_add_tail(&iommu->list, &iommu_device_list);
95 spin_unlock(&iommu_device_lock);
100 void iommu_device_unregister(struct iommu_device *iommu)
102 spin_lock(&iommu_device_lock);
103 list_del(&iommu->list);
104 spin_unlock(&iommu_device_lock);
107 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
109 static int __iommu_attach_device(struct iommu_domain *domain,
111 static int __iommu_attach_group(struct iommu_domain *domain,
112 struct iommu_group *group);
113 static void __iommu_detach_group(struct iommu_domain *domain,
114 struct iommu_group *group);
116 static int __init iommu_set_def_domain_type(char *str)
120 if (!str || strtobool(str, &pt))
123 iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA;
126 early_param("iommu.passthrough", iommu_set_def_domain_type);
128 static ssize_t iommu_group_attr_show(struct kobject *kobj,
129 struct attribute *__attr, char *buf)
131 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
132 struct iommu_group *group = to_iommu_group(kobj);
136 ret = attr->show(group, buf);
140 static ssize_t iommu_group_attr_store(struct kobject *kobj,
141 struct attribute *__attr,
142 const char *buf, size_t count)
144 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
145 struct iommu_group *group = to_iommu_group(kobj);
149 ret = attr->store(group, buf, count);
153 static const struct sysfs_ops iommu_group_sysfs_ops = {
154 .show = iommu_group_attr_show,
155 .store = iommu_group_attr_store,
158 static int iommu_group_create_file(struct iommu_group *group,
159 struct iommu_group_attribute *attr)
161 return sysfs_create_file(&group->kobj, &attr->attr);
164 static void iommu_group_remove_file(struct iommu_group *group,
165 struct iommu_group_attribute *attr)
167 sysfs_remove_file(&group->kobj, &attr->attr);
170 static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
172 return sprintf(buf, "%s\n", group->name);
176 * iommu_insert_resv_region - Insert a new region in the
177 * list of reserved regions.
178 * @new: new region to insert
179 * @regions: list of regions
181 * The new element is sorted by address with respect to the other
182 * regions of the same type. In case it overlaps with another
183 * region of the same type, regions are merged. In case it
184 * overlaps with another region of different type, regions are
187 static int iommu_insert_resv_region(struct iommu_resv_region *new,
188 struct list_head *regions)
190 struct iommu_resv_region *region;
191 phys_addr_t start = new->start;
192 phys_addr_t end = new->start + new->length - 1;
193 struct list_head *pos = regions->next;
195 while (pos != regions) {
196 struct iommu_resv_region *entry =
197 list_entry(pos, struct iommu_resv_region, list);
198 phys_addr_t a = entry->start;
199 phys_addr_t b = entry->start + entry->length - 1;
200 int type = entry->type;
204 } else if (start > b) {
206 } else if ((start >= a) && (end <= b)) {
207 if (new->type == type)
212 if (new->type == type) {
213 phys_addr_t new_start = min(a, start);
214 phys_addr_t new_end = max(b, end);
217 list_del(&entry->list);
218 entry->start = new_start;
219 entry->length = new_end - new_start + 1;
220 ret = iommu_insert_resv_region(entry, regions);
229 region = iommu_alloc_resv_region(new->start, new->length,
230 new->prot, new->type);
234 list_add_tail(®ion->list, pos);
239 iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
240 struct list_head *group_resv_regions)
242 struct iommu_resv_region *entry;
245 list_for_each_entry(entry, dev_resv_regions, list) {
246 ret = iommu_insert_resv_region(entry, group_resv_regions);
253 int iommu_get_group_resv_regions(struct iommu_group *group,
254 struct list_head *head)
256 struct group_device *device;
259 mutex_lock(&group->mutex);
260 list_for_each_entry(device, &group->devices, list) {
261 struct list_head dev_resv_regions;
263 INIT_LIST_HEAD(&dev_resv_regions);
264 iommu_get_resv_regions(device->dev, &dev_resv_regions);
265 ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
266 iommu_put_resv_regions(device->dev, &dev_resv_regions);
270 mutex_unlock(&group->mutex);
273 EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
275 static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
278 struct iommu_resv_region *region, *next;
279 struct list_head group_resv_regions;
282 INIT_LIST_HEAD(&group_resv_regions);
283 iommu_get_group_resv_regions(group, &group_resv_regions);
285 list_for_each_entry_safe(region, next, &group_resv_regions, list) {
286 str += sprintf(str, "0x%016llx 0x%016llx %s\n",
287 (long long int)region->start,
288 (long long int)(region->start +
290 iommu_group_resv_type_string[region->type]);
297 static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
299 static IOMMU_GROUP_ATTR(reserved_regions, 0444,
300 iommu_group_show_resv_regions, NULL);
302 static void iommu_group_release(struct kobject *kobj)
304 struct iommu_group *group = to_iommu_group(kobj);
306 pr_debug("Releasing group %d\n", group->id);
308 if (group->iommu_data_release)
309 group->iommu_data_release(group->iommu_data);
311 ida_simple_remove(&iommu_group_ida, group->id);
313 if (group->default_domain)
314 iommu_domain_free(group->default_domain);
320 static struct kobj_type iommu_group_ktype = {
321 .sysfs_ops = &iommu_group_sysfs_ops,
322 .release = iommu_group_release,
326 * iommu_group_alloc - Allocate a new group
327 * @name: Optional name to associate with group, visible in sysfs
329 * This function is called by an iommu driver to allocate a new iommu
330 * group. The iommu group represents the minimum granularity of the iommu.
331 * Upon successful return, the caller holds a reference to the supplied
332 * group in order to hold the group until devices are added. Use
333 * iommu_group_put() to release this extra reference count, allowing the
334 * group to be automatically reclaimed once it has no devices or external
337 struct iommu_group *iommu_group_alloc(void)
339 struct iommu_group *group;
342 group = kzalloc(sizeof(*group), GFP_KERNEL);
344 return ERR_PTR(-ENOMEM);
346 group->kobj.kset = iommu_group_kset;
347 mutex_init(&group->mutex);
348 INIT_LIST_HEAD(&group->devices);
349 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
351 ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);
358 ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
359 NULL, "%d", group->id);
361 ida_simple_remove(&iommu_group_ida, group->id);
362 kobject_put(&group->kobj);
366 group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
367 if (!group->devices_kobj) {
368 kobject_put(&group->kobj); /* triggers .release & free */
369 return ERR_PTR(-ENOMEM);
373 * The devices_kobj holds a reference on the group kobject, so
374 * as long as that exists so will the group. We can therefore
375 * use the devices_kobj for reference counting.
377 kobject_put(&group->kobj);
379 ret = iommu_group_create_file(group,
380 &iommu_group_attr_reserved_regions);
384 pr_debug("Allocated group %d\n", group->id);
388 EXPORT_SYMBOL_GPL(iommu_group_alloc);
390 struct iommu_group *iommu_group_get_by_id(int id)
392 struct kobject *group_kobj;
393 struct iommu_group *group;
396 if (!iommu_group_kset)
399 name = kasprintf(GFP_KERNEL, "%d", id);
403 group_kobj = kset_find_obj(iommu_group_kset, name);
409 group = container_of(group_kobj, struct iommu_group, kobj);
410 BUG_ON(group->id != id);
412 kobject_get(group->devices_kobj);
413 kobject_put(&group->kobj);
417 EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
420 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
423 * iommu drivers can store data in the group for use when doing iommu
424 * operations. This function provides a way to retrieve it. Caller
425 * should hold a group reference.
427 void *iommu_group_get_iommudata(struct iommu_group *group)
429 return group->iommu_data;
431 EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
434 * iommu_group_set_iommudata - set iommu_data for a group
436 * @iommu_data: new data
437 * @release: release function for iommu_data
439 * iommu drivers can store data in the group for use when doing iommu
440 * operations. This function provides a way to set the data after
441 * the group has been allocated. Caller should hold a group reference.
443 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
444 void (*release)(void *iommu_data))
446 group->iommu_data = iommu_data;
447 group->iommu_data_release = release;
449 EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
452 * iommu_group_set_name - set name for a group
456 * Allow iommu driver to set a name for a group. When set it will
457 * appear in a name attribute file under the group in sysfs.
459 int iommu_group_set_name(struct iommu_group *group, const char *name)
464 iommu_group_remove_file(group, &iommu_group_attr_name);
471 group->name = kstrdup(name, GFP_KERNEL);
475 ret = iommu_group_create_file(group, &iommu_group_attr_name);
484 EXPORT_SYMBOL_GPL(iommu_group_set_name);
486 static int iommu_group_create_direct_mappings(struct iommu_group *group,
489 struct iommu_domain *domain = group->default_domain;
490 struct iommu_resv_region *entry;
491 struct list_head mappings;
492 unsigned long pg_size;
495 if (!domain || domain->type != IOMMU_DOMAIN_DMA)
498 BUG_ON(!domain->pgsize_bitmap);
500 pg_size = 1UL << __ffs(domain->pgsize_bitmap);
501 INIT_LIST_HEAD(&mappings);
503 iommu_get_resv_regions(dev, &mappings);
505 /* We need to consider overlapping regions for different devices */
506 list_for_each_entry(entry, &mappings, list) {
507 dma_addr_t start, end, addr;
509 if (domain->ops->apply_resv_region)
510 domain->ops->apply_resv_region(dev, domain, entry);
512 start = ALIGN(entry->start, pg_size);
513 end = ALIGN(entry->start + entry->length, pg_size);
515 if (entry->type != IOMMU_RESV_DIRECT)
518 for (addr = start; addr < end; addr += pg_size) {
519 phys_addr_t phys_addr;
521 phys_addr = iommu_iova_to_phys(domain, addr);
525 ret = iommu_map(domain, addr, addr, pg_size, entry->prot);
532 iommu_flush_tlb_all(domain);
535 iommu_put_resv_regions(dev, &mappings);
541 * iommu_group_add_device - add a device to an iommu group
542 * @group: the group into which to add the device (reference should be held)
545 * This function is called by an iommu driver to add a device into a
546 * group. Adding a device increments the group reference count.
548 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
551 struct group_device *device;
553 device = kzalloc(sizeof(*device), GFP_KERNEL);
559 ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
561 goto err_free_device;
563 device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
567 goto err_remove_link;
570 ret = sysfs_create_link_nowarn(group->devices_kobj,
571 &dev->kobj, device->name);
573 if (ret == -EEXIST && i >= 0) {
575 * Account for the slim chance of collision
576 * and append an instance to the name.
579 device->name = kasprintf(GFP_KERNEL, "%s.%d",
580 kobject_name(&dev->kobj), i++);
586 kobject_get(group->devices_kobj);
588 dev->iommu_group = group;
590 iommu_group_create_direct_mappings(group, dev);
592 mutex_lock(&group->mutex);
593 list_add_tail(&device->list, &group->devices);
595 ret = __iommu_attach_device(group->domain, dev);
596 mutex_unlock(&group->mutex);
600 /* Notify any listeners about change to group. */
601 blocking_notifier_call_chain(&group->notifier,
602 IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
604 trace_add_device_to_group(group->id, dev);
606 pr_info("Adding device %s to group %d\n", dev_name(dev), group->id);
611 mutex_lock(&group->mutex);
612 list_del(&device->list);
613 mutex_unlock(&group->mutex);
614 dev->iommu_group = NULL;
615 kobject_put(group->devices_kobj);
616 sysfs_remove_link(group->devices_kobj, device->name);
620 sysfs_remove_link(&dev->kobj, "iommu_group");
623 pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret);
626 EXPORT_SYMBOL_GPL(iommu_group_add_device);
629 * iommu_group_remove_device - remove a device from it's current group
630 * @dev: device to be removed
632 * This function is called by an iommu driver to remove the device from
633 * it's current group. This decrements the iommu group reference count.
635 void iommu_group_remove_device(struct device *dev)
637 struct iommu_group *group = dev->iommu_group;
638 struct group_device *tmp_device, *device = NULL;
640 pr_info("Removing device %s from group %d\n", dev_name(dev), group->id);
642 /* Pre-notify listeners that a device is being removed. */
643 blocking_notifier_call_chain(&group->notifier,
644 IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
646 mutex_lock(&group->mutex);
647 list_for_each_entry(tmp_device, &group->devices, list) {
648 if (tmp_device->dev == dev) {
650 list_del(&device->list);
654 mutex_unlock(&group->mutex);
659 sysfs_remove_link(group->devices_kobj, device->name);
660 sysfs_remove_link(&dev->kobj, "iommu_group");
662 trace_remove_device_from_group(group->id, dev);
666 dev->iommu_group = NULL;
667 kobject_put(group->devices_kobj);
669 EXPORT_SYMBOL_GPL(iommu_group_remove_device);
671 static int iommu_group_device_count(struct iommu_group *group)
673 struct group_device *entry;
676 list_for_each_entry(entry, &group->devices, list)
683 * iommu_group_for_each_dev - iterate over each device in the group
685 * @data: caller opaque data to be passed to callback function
686 * @fn: caller supplied callback function
688 * This function is called by group users to iterate over group devices.
689 * Callers should hold a reference count to the group during callback.
690 * The group->mutex is held across callbacks, which will block calls to
691 * iommu_group_add/remove_device.
693 static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
694 int (*fn)(struct device *, void *))
696 struct group_device *device;
699 list_for_each_entry(device, &group->devices, list) {
700 ret = fn(device->dev, data);
708 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
709 int (*fn)(struct device *, void *))
713 mutex_lock(&group->mutex);
714 ret = __iommu_group_for_each_dev(group, data, fn);
715 mutex_unlock(&group->mutex);
719 EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
722 * iommu_group_get - Return the group for a device and increment reference
723 * @dev: get the group that this device belongs to
725 * This function is called by iommu drivers and users to get the group
726 * for the specified device. If found, the group is returned and the group
727 * reference in incremented, else NULL.
729 struct iommu_group *iommu_group_get(struct device *dev)
731 struct iommu_group *group = dev->iommu_group;
734 kobject_get(group->devices_kobj);
738 EXPORT_SYMBOL_GPL(iommu_group_get);
741 * iommu_group_ref_get - Increment reference on a group
742 * @group: the group to use, must not be NULL
744 * This function is called by iommu drivers to take additional references on an
745 * existing group. Returns the given group for convenience.
747 struct iommu_group *iommu_group_ref_get(struct iommu_group *group)
749 kobject_get(group->devices_kobj);
754 * iommu_group_put - Decrement group reference
755 * @group: the group to use
757 * This function is called by iommu drivers and users to release the
758 * iommu group. Once the reference count is zero, the group is released.
760 void iommu_group_put(struct iommu_group *group)
763 kobject_put(group->devices_kobj);
765 EXPORT_SYMBOL_GPL(iommu_group_put);
768 * iommu_group_register_notifier - Register a notifier for group changes
769 * @group: the group to watch
770 * @nb: notifier block to signal
772 * This function allows iommu group users to track changes in a group.
773 * See include/linux/iommu.h for actions sent via this notifier. Caller
774 * should hold a reference to the group throughout notifier registration.
776 int iommu_group_register_notifier(struct iommu_group *group,
777 struct notifier_block *nb)
779 return blocking_notifier_chain_register(&group->notifier, nb);
781 EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
784 * iommu_group_unregister_notifier - Unregister a notifier
785 * @group: the group to watch
786 * @nb: notifier block to signal
788 * Unregister a previously registered group notifier block.
790 int iommu_group_unregister_notifier(struct iommu_group *group,
791 struct notifier_block *nb)
793 return blocking_notifier_chain_unregister(&group->notifier, nb);
795 EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
798 * iommu_group_id - Return ID for a group
799 * @group: the group to ID
801 * Return the unique ID for the group matching the sysfs group number.
803 int iommu_group_id(struct iommu_group *group)
807 EXPORT_SYMBOL_GPL(iommu_group_id);
809 static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
810 unsigned long *devfns);
813 * To consider a PCI device isolated, we require ACS to support Source
814 * Validation, Request Redirection, Completer Redirection, and Upstream
815 * Forwarding. This effectively means that devices cannot spoof their
816 * requester ID, requests and completions cannot be redirected, and all
817 * transactions are forwarded upstream, even as it passes through a
818 * bridge where the target device is downstream.
820 #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
823 * For multifunction devices which are not isolated from each other, find
824 * all the other non-isolated functions and look for existing groups. For
825 * each function, we also need to look for aliases to or from other devices
826 * that may already have a group.
828 static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev,
829 unsigned long *devfns)
831 struct pci_dev *tmp = NULL;
832 struct iommu_group *group;
834 if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS))
837 for_each_pci_dev(tmp) {
838 if (tmp == pdev || tmp->bus != pdev->bus ||
839 PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) ||
840 pci_acs_enabled(tmp, REQ_ACS_FLAGS))
843 group = get_pci_alias_group(tmp, devfns);
854 * Look for aliases to or from the given device for existing groups. DMA
855 * aliases are only supported on the same bus, therefore the search
856 * space is quite small (especially since we're really only looking at pcie
857 * device, and therefore only expect multiple slots on the root complex or
858 * downstream switch ports). It's conceivable though that a pair of
859 * multifunction devices could have aliases between them that would cause a
860 * loop. To prevent this, we use a bitmap to track where we've been.
862 static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
863 unsigned long *devfns)
865 struct pci_dev *tmp = NULL;
866 struct iommu_group *group;
868 if (test_and_set_bit(pdev->devfn & 0xff, devfns))
871 group = iommu_group_get(&pdev->dev);
875 for_each_pci_dev(tmp) {
876 if (tmp == pdev || tmp->bus != pdev->bus)
879 /* We alias them or they alias us */
880 if (pci_devs_are_dma_aliases(pdev, tmp)) {
881 group = get_pci_alias_group(tmp, devfns);
887 group = get_pci_function_alias_group(tmp, devfns);
898 struct group_for_pci_data {
899 struct pci_dev *pdev;
900 struct iommu_group *group;
904 * DMA alias iterator callback, return the last seen device. Stop and return
905 * the IOMMU group if we find one along the way.
907 static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
909 struct group_for_pci_data *data = opaque;
912 data->group = iommu_group_get(&pdev->dev);
914 return data->group != NULL;
918 * Generic device_group call-back function. It just allocates one
919 * iommu-group per device.
921 struct iommu_group *generic_device_group(struct device *dev)
923 return iommu_group_alloc();
927 * Use standard PCI bus topology, isolation features, and DMA alias quirks
928 * to find or create an IOMMU group for a device.
930 struct iommu_group *pci_device_group(struct device *dev)
932 struct pci_dev *pdev = to_pci_dev(dev);
933 struct group_for_pci_data data;
935 struct iommu_group *group = NULL;
936 u64 devfns[4] = { 0 };
938 if (WARN_ON(!dev_is_pci(dev)))
939 return ERR_PTR(-EINVAL);
942 * Find the upstream DMA alias for the device. A device must not
943 * be aliased due to topology in order to have its own IOMMU group.
944 * If we find an alias along the way that already belongs to a
947 if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data))
953 * Continue upstream from the point of minimum IOMMU granularity
954 * due to aliases to the point where devices are protected from
955 * peer-to-peer DMA by PCI ACS. Again, if we find an existing
958 for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
962 if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
967 group = iommu_group_get(&pdev->dev);
973 * Look for existing groups on device aliases. If we alias another
974 * device or another device aliases us, use the same group.
976 group = get_pci_alias_group(pdev, (unsigned long *)devfns);
981 * Look for existing groups on non-isolated functions on the same
982 * slot and aliases of those funcions, if any. No need to clear
983 * the search bitmap, the tested devfns are still valid.
985 group = get_pci_function_alias_group(pdev, (unsigned long *)devfns);
989 /* No shared group found, allocate new */
990 return iommu_group_alloc();
994 * iommu_group_get_for_dev - Find or create the IOMMU group for a device
995 * @dev: target device
997 * This function is intended to be called by IOMMU drivers and extended to
998 * support common, bus-defined algorithms when determining or creating the
999 * IOMMU group for a device. On success, the caller will hold a reference
1000 * to the returned IOMMU group, which will already include the provided
1001 * device. The reference should be released with iommu_group_put().
1003 struct iommu_group *iommu_group_get_for_dev(struct device *dev)
1005 const struct iommu_ops *ops = dev->bus->iommu_ops;
1006 struct iommu_group *group;
1009 group = iommu_group_get(dev);
1014 return ERR_PTR(-EINVAL);
1016 group = ops->device_group(dev);
1017 if (WARN_ON_ONCE(group == NULL))
1018 return ERR_PTR(-EINVAL);
1024 * Try to allocate a default domain - needs support from the
1027 if (!group->default_domain) {
1028 struct iommu_domain *dom;
1030 dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
1031 if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
1033 "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
1034 iommu_def_domain_type);
1035 dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
1038 group->default_domain = dom;
1040 group->domain = dom;
1043 ret = iommu_group_add_device(group, dev);
1045 iommu_group_put(group);
1046 return ERR_PTR(ret);
1052 struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
1054 return group->default_domain;
1057 static int add_iommu_group(struct device *dev, void *data)
1059 struct iommu_callback_data *cb = data;
1060 const struct iommu_ops *ops = cb->ops;
1063 if (!ops->add_device)
1066 WARN_ON(dev->iommu_group);
1068 ret = ops->add_device(dev);
1071 * We ignore -ENODEV errors for now, as they just mean that the
1072 * device is not translated by an IOMMU. We still care about
1073 * other errors and fail to initialize when they happen.
1081 static int remove_iommu_group(struct device *dev, void *data)
1083 struct iommu_callback_data *cb = data;
1084 const struct iommu_ops *ops = cb->ops;
1086 if (ops->remove_device && dev->iommu_group)
1087 ops->remove_device(dev);
1092 static int iommu_bus_notifier(struct notifier_block *nb,
1093 unsigned long action, void *data)
1095 struct device *dev = data;
1096 const struct iommu_ops *ops = dev->bus->iommu_ops;
1097 struct iommu_group *group;
1098 unsigned long group_action = 0;
1101 * ADD/DEL call into iommu driver ops if provided, which may
1102 * result in ADD/DEL notifiers to group->notifier
1104 if (action == BUS_NOTIFY_ADD_DEVICE) {
1105 if (ops->add_device) {
1108 ret = ops->add_device(dev);
1109 return (ret) ? NOTIFY_DONE : NOTIFY_OK;
1111 } else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
1112 if (ops->remove_device && dev->iommu_group) {
1113 ops->remove_device(dev);
1119 * Remaining BUS_NOTIFYs get filtered and republished to the
1120 * group, if anyone is listening
1122 group = iommu_group_get(dev);
1127 case BUS_NOTIFY_BIND_DRIVER:
1128 group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
1130 case BUS_NOTIFY_BOUND_DRIVER:
1131 group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
1133 case BUS_NOTIFY_UNBIND_DRIVER:
1134 group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
1136 case BUS_NOTIFY_UNBOUND_DRIVER:
1137 group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
1142 blocking_notifier_call_chain(&group->notifier,
1145 iommu_group_put(group);
1149 static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
1152 struct notifier_block *nb;
1153 struct iommu_callback_data cb = {
1157 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
1161 nb->notifier_call = iommu_bus_notifier;
1163 err = bus_register_notifier(bus, nb);
1167 err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
1176 bus_for_each_dev(bus, NULL, &cb, remove_iommu_group);
1177 bus_unregister_notifier(bus, nb);
1186 * bus_set_iommu - set iommu-callbacks for the bus
1188 * @ops: the callbacks provided by the iommu-driver
1190 * This function is called by an iommu driver to set the iommu methods
1191 * used for a particular bus. Drivers for devices on that bus can use
1192 * the iommu-api after these ops are registered.
1193 * This special function is needed because IOMMUs are usually devices on
1194 * the bus itself, so the iommu drivers are not initialized when the bus
1195 * is set up. With this function the iommu-driver can set the iommu-ops
1198 int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
1202 if (bus->iommu_ops != NULL)
1205 bus->iommu_ops = ops;
1207 /* Do IOMMU specific setup for this bus-type */
1208 err = iommu_bus_init(bus, ops);
1210 bus->iommu_ops = NULL;
1214 EXPORT_SYMBOL_GPL(bus_set_iommu);
1216 bool iommu_present(struct bus_type *bus)
1218 return bus->iommu_ops != NULL;
1220 EXPORT_SYMBOL_GPL(iommu_present);
1222 bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
1224 if (!bus->iommu_ops || !bus->iommu_ops->capable)
1227 return bus->iommu_ops->capable(cap);
1229 EXPORT_SYMBOL_GPL(iommu_capable);
1232 * iommu_set_fault_handler() - set a fault handler for an iommu domain
1233 * @domain: iommu domain
1234 * @handler: fault handler
1235 * @token: user data, will be passed back to the fault handler
1237 * This function should be used by IOMMU users which want to be notified
1238 * whenever an IOMMU fault happens.
1240 * The fault handler itself should return 0 on success, and an appropriate
1241 * error code otherwise.
1243 void iommu_set_fault_handler(struct iommu_domain *domain,
1244 iommu_fault_handler_t handler,
1249 domain->handler = handler;
1250 domain->handler_token = token;
1252 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
1254 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
1257 struct iommu_domain *domain;
1259 if (bus == NULL || bus->iommu_ops == NULL)
1262 domain = bus->iommu_ops->domain_alloc(type);
1266 domain->ops = bus->iommu_ops;
1267 domain->type = type;
1268 /* Assume all sizes by default; the driver may override this later */
1269 domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
1274 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
1276 return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
1278 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
1280 void iommu_domain_free(struct iommu_domain *domain)
1282 domain->ops->domain_free(domain);
1284 EXPORT_SYMBOL_GPL(iommu_domain_free);
1286 static int __iommu_attach_device(struct iommu_domain *domain,
1290 if ((domain->ops->is_attach_deferred != NULL) &&
1291 domain->ops->is_attach_deferred(domain, dev))
1294 if (unlikely(domain->ops->attach_dev == NULL))
1297 ret = domain->ops->attach_dev(domain, dev);
1299 trace_attach_device_to_domain(dev);
1303 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
1305 struct iommu_group *group;
1308 group = iommu_group_get(dev);
1310 * Lock the group to make sure the device-count doesn't
1311 * change while we are attaching
1313 mutex_lock(&group->mutex);
1315 if (iommu_group_device_count(group) != 1)
1318 ret = __iommu_attach_group(domain, group);
1321 mutex_unlock(&group->mutex);
1322 iommu_group_put(group);
1326 EXPORT_SYMBOL_GPL(iommu_attach_device);
1328 static void __iommu_detach_device(struct iommu_domain *domain,
1331 if ((domain->ops->is_attach_deferred != NULL) &&
1332 domain->ops->is_attach_deferred(domain, dev))
1335 if (unlikely(domain->ops->detach_dev == NULL))
1338 domain->ops->detach_dev(domain, dev);
1339 trace_detach_device_from_domain(dev);
1342 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
1344 struct iommu_group *group;
1346 group = iommu_group_get(dev);
1348 mutex_lock(&group->mutex);
1349 if (iommu_group_device_count(group) != 1) {
1354 __iommu_detach_group(domain, group);
1357 mutex_unlock(&group->mutex);
1358 iommu_group_put(group);
1360 EXPORT_SYMBOL_GPL(iommu_detach_device);
1362 struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
1364 struct iommu_domain *domain;
1365 struct iommu_group *group;
1367 group = iommu_group_get(dev);
1371 domain = group->domain;
1373 iommu_group_put(group);
1377 EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
1380 * IOMMU groups are really the natrual working unit of the IOMMU, but
1381 * the IOMMU API works on domains and devices. Bridge that gap by
1382 * iterating over the devices in a group. Ideally we'd have a single
1383 * device which represents the requestor ID of the group, but we also
1384 * allow IOMMU drivers to create policy defined minimum sets, where
1385 * the physical hardware may be able to distiguish members, but we
1386 * wish to group them at a higher level (ex. untrusted multi-function
1387 * PCI devices). Thus we attach each device.
1389 static int iommu_group_do_attach_device(struct device *dev, void *data)
1391 struct iommu_domain *domain = data;
1393 return __iommu_attach_device(domain, dev);
1396 static int __iommu_attach_group(struct iommu_domain *domain,
1397 struct iommu_group *group)
1401 if (group->default_domain && group->domain != group->default_domain)
1404 ret = __iommu_group_for_each_dev(group, domain,
1405 iommu_group_do_attach_device);
1407 group->domain = domain;
1412 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
1416 mutex_lock(&group->mutex);
1417 ret = __iommu_attach_group(domain, group);
1418 mutex_unlock(&group->mutex);
1422 EXPORT_SYMBOL_GPL(iommu_attach_group);
1424 static int iommu_group_do_detach_device(struct device *dev, void *data)
1426 struct iommu_domain *domain = data;
1428 __iommu_detach_device(domain, dev);
1433 static void __iommu_detach_group(struct iommu_domain *domain,
1434 struct iommu_group *group)
1438 if (!group->default_domain) {
1439 __iommu_group_for_each_dev(group, domain,
1440 iommu_group_do_detach_device);
1441 group->domain = NULL;
1445 if (group->domain == group->default_domain)
1448 /* Detach by re-attaching to the default domain */
1449 ret = __iommu_group_for_each_dev(group, group->default_domain,
1450 iommu_group_do_attach_device);
1454 group->domain = group->default_domain;
1457 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
1459 mutex_lock(&group->mutex);
1460 __iommu_detach_group(domain, group);
1461 mutex_unlock(&group->mutex);
1463 EXPORT_SYMBOL_GPL(iommu_detach_group);
1465 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
1467 if (unlikely(domain->ops->iova_to_phys == NULL))
1470 return domain->ops->iova_to_phys(domain, iova);
1472 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
1474 static size_t iommu_pgsize(struct iommu_domain *domain,
1475 unsigned long addr_merge, size_t size)
1477 unsigned int pgsize_idx;
1480 /* Max page size that still fits into 'size' */
1481 pgsize_idx = __fls(size);
1483 /* need to consider alignment requirements ? */
1484 if (likely(addr_merge)) {
1485 /* Max page size allowed by address */
1486 unsigned int align_pgsize_idx = __ffs(addr_merge);
1487 pgsize_idx = min(pgsize_idx, align_pgsize_idx);
1490 /* build a mask of acceptable page sizes */
1491 pgsize = (1UL << (pgsize_idx + 1)) - 1;
1493 /* throw away page sizes not supported by the hardware */
1494 pgsize &= domain->pgsize_bitmap;
1496 /* make sure we're still sane */
1499 /* pick the biggest page */
1500 pgsize_idx = __fls(pgsize);
1501 pgsize = 1UL << pgsize_idx;
1506 int iommu_map(struct iommu_domain *domain, unsigned long iova,
1507 phys_addr_t paddr, size_t size, int prot)
1509 unsigned long orig_iova = iova;
1510 unsigned int min_pagesz;
1511 size_t orig_size = size;
1512 phys_addr_t orig_paddr = paddr;
1515 if (unlikely(domain->ops->map == NULL ||
1516 domain->pgsize_bitmap == 0UL))
1519 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
1522 /* find out the minimum page size supported */
1523 min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
1526 * both the virtual address and the physical one, as well as
1527 * the size of the mapping, must be aligned (at least) to the
1528 * size of the smallest page supported by the hardware
1530 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
1531 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
1532 iova, &paddr, size, min_pagesz);
1536 pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
1539 size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
1541 pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
1542 iova, &paddr, pgsize);
1544 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
1553 /* unroll mapping in case something went wrong */
1555 iommu_unmap(domain, orig_iova, orig_size - size);
1557 trace_map(orig_iova, orig_paddr, orig_size);
1561 EXPORT_SYMBOL_GPL(iommu_map);
1563 static size_t __iommu_unmap(struct iommu_domain *domain,
1564 unsigned long iova, size_t size,
1567 const struct iommu_ops *ops = domain->ops;
1568 size_t unmapped_page, unmapped = 0;
1569 unsigned long orig_iova = iova;
1570 unsigned int min_pagesz;
1572 if (unlikely(ops->unmap == NULL ||
1573 domain->pgsize_bitmap == 0UL))
1576 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
1579 /* find out the minimum page size supported */
1580 min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
1583 * The virtual address, as well as the size of the mapping, must be
1584 * aligned (at least) to the size of the smallest page supported
1587 if (!IS_ALIGNED(iova | size, min_pagesz)) {
1588 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
1589 iova, size, min_pagesz);
1593 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
1596 * Keep iterating until we either unmap 'size' bytes (or more)
1597 * or we hit an area that isn't mapped.
1599 while (unmapped < size) {
1600 size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
1602 unmapped_page = ops->unmap(domain, iova, pgsize);
1606 if (sync && ops->iotlb_range_add)
1607 ops->iotlb_range_add(domain, iova, pgsize);
1609 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
1610 iova, unmapped_page);
1612 iova += unmapped_page;
1613 unmapped += unmapped_page;
1616 if (sync && ops->iotlb_sync)
1617 ops->iotlb_sync(domain);
1619 trace_unmap(orig_iova, size, unmapped);
1623 size_t iommu_unmap(struct iommu_domain *domain,
1624 unsigned long iova, size_t size)
1626 return __iommu_unmap(domain, iova, size, true);
1628 EXPORT_SYMBOL_GPL(iommu_unmap);
1630 size_t iommu_unmap_fast(struct iommu_domain *domain,
1631 unsigned long iova, size_t size)
1633 return __iommu_unmap(domain, iova, size, false);
1635 EXPORT_SYMBOL_GPL(iommu_unmap_fast);
1637 size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
1638 struct scatterlist *sg, unsigned int nents, int prot)
1640 struct scatterlist *s;
1642 unsigned int i, min_pagesz;
1645 if (unlikely(domain->pgsize_bitmap == 0UL))
1648 min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
1650 for_each_sg(sg, s, nents, i) {
1651 phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
1654 * We are mapping on IOMMU page boundaries, so offset within
1655 * the page must be 0. However, the IOMMU may support pages
1656 * smaller than PAGE_SIZE, so s->offset may still represent
1657 * an offset of that boundary within the CPU page.
1659 if (!IS_ALIGNED(s->offset, min_pagesz))
1662 ret = iommu_map(domain, iova + mapped, phys, s->length, prot);
1666 mapped += s->length;
1672 /* undo mappings already done */
1673 iommu_unmap(domain, iova, mapped);
1678 EXPORT_SYMBOL_GPL(default_iommu_map_sg);
1680 int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
1681 phys_addr_t paddr, u64 size, int prot)
1683 if (unlikely(domain->ops->domain_window_enable == NULL))
1686 return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
1689 EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
1691 void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
1693 if (unlikely(domain->ops->domain_window_disable == NULL))
1696 return domain->ops->domain_window_disable(domain, wnd_nr);
1698 EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
1701 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
1702 * @domain: the iommu domain where the fault has happened
1703 * @dev: the device where the fault has happened
1704 * @iova: the faulting address
1705 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
1707 * This function should be called by the low-level IOMMU implementations
1708 * whenever IOMMU faults happen, to allow high-level users, that are
1709 * interested in such events, to know about them.
1711 * This event may be useful for several possible use cases:
1712 * - mere logging of the event
1713 * - dynamic TLB/PTE loading
1714 * - if restarting of the faulting device is required
1716 * Returns 0 on success and an appropriate error code otherwise (if dynamic
1717 * PTE/TLB loading will one day be supported, implementations will be able
1718 * to tell whether it succeeded or not according to this return value).
1720 * Specifically, -ENOSYS is returned if a fault handler isn't installed
1721 * (though fault handlers can also return -ENOSYS, in case they want to
1722 * elicit the default behavior of the IOMMU drivers).
1724 int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
1725 unsigned long iova, int flags)
1730 * if upper layers showed interest and installed a fault handler,
1733 if (domain->handler)
1734 ret = domain->handler(domain, dev, iova, flags,
1735 domain->handler_token);
1737 trace_io_page_fault(dev, iova, flags);
1740 EXPORT_SYMBOL_GPL(report_iommu_fault);
1742 static int __init iommu_init(void)
1744 iommu_group_kset = kset_create_and_add("iommu_groups",
1746 BUG_ON(!iommu_group_kset);
1750 core_initcall(iommu_init);
1752 int iommu_domain_get_attr(struct iommu_domain *domain,
1753 enum iommu_attr attr, void *data)
1755 struct iommu_domain_geometry *geometry;
1761 case DOMAIN_ATTR_GEOMETRY:
1763 *geometry = domain->geometry;
1766 case DOMAIN_ATTR_PAGING:
1768 *paging = (domain->pgsize_bitmap != 0UL);
1770 case DOMAIN_ATTR_WINDOWS:
1773 if (domain->ops->domain_get_windows != NULL)
1774 *count = domain->ops->domain_get_windows(domain);
1780 if (!domain->ops->domain_get_attr)
1783 ret = domain->ops->domain_get_attr(domain, attr, data);
1788 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
1790 int iommu_domain_set_attr(struct iommu_domain *domain,
1791 enum iommu_attr attr, void *data)
1797 case DOMAIN_ATTR_WINDOWS:
1800 if (domain->ops->domain_set_windows != NULL)
1801 ret = domain->ops->domain_set_windows(domain, *count);
1807 if (domain->ops->domain_set_attr == NULL)
1810 ret = domain->ops->domain_set_attr(domain, attr, data);
1815 EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
1817 void iommu_get_resv_regions(struct device *dev, struct list_head *list)
1819 const struct iommu_ops *ops = dev->bus->iommu_ops;
1821 if (ops && ops->get_resv_regions)
1822 ops->get_resv_regions(dev, list);
1825 void iommu_put_resv_regions(struct device *dev, struct list_head *list)
1827 const struct iommu_ops *ops = dev->bus->iommu_ops;
1829 if (ops && ops->put_resv_regions)
1830 ops->put_resv_regions(dev, list);
1833 struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
1834 size_t length, int prot,
1835 enum iommu_resv_type type)
1837 struct iommu_resv_region *region;
1839 region = kzalloc(sizeof(*region), GFP_KERNEL);
1843 INIT_LIST_HEAD(®ion->list);
1844 region->start = start;
1845 region->length = length;
1846 region->prot = prot;
1847 region->type = type;
1851 /* Request that a device is direct mapped by the IOMMU */
1852 int iommu_request_dm_for_dev(struct device *dev)
1854 struct iommu_domain *dm_domain;
1855 struct iommu_group *group;
1858 /* Device must already be in a group before calling this function */
1859 group = iommu_group_get(dev);
1863 mutex_lock(&group->mutex);
1865 /* Check if the default domain is already direct mapped */
1867 if (group->default_domain &&
1868 group->default_domain->type == IOMMU_DOMAIN_IDENTITY)
1871 /* Don't change mappings of existing devices */
1873 if (iommu_group_device_count(group) != 1)
1876 /* Allocate a direct mapped domain */
1878 dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY);
1882 /* Attach the device to the domain */
1883 ret = __iommu_attach_group(dm_domain, group);
1885 iommu_domain_free(dm_domain);
1889 /* Make the direct mapped domain the default for this group */
1890 if (group->default_domain)
1891 iommu_domain_free(group->default_domain);
1892 group->default_domain = dm_domain;
1894 pr_info("Using direct mapping for device %s\n", dev_name(dev));
1898 mutex_unlock(&group->mutex);
1899 iommu_group_put(group);
1904 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1906 const struct iommu_ops *ops = NULL;
1907 struct iommu_device *iommu;
1909 spin_lock(&iommu_device_lock);
1910 list_for_each_entry(iommu, &iommu_device_list, list)
1911 if (iommu->fwnode == fwnode) {
1915 spin_unlock(&iommu_device_lock);
1919 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
1920 const struct iommu_ops *ops)
1922 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1925 return ops == fwspec->ops ? 0 : -EINVAL;
1927 fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
1931 of_node_get(to_of_node(iommu_fwnode));
1932 fwspec->iommu_fwnode = iommu_fwnode;
1934 dev->iommu_fwspec = fwspec;
1937 EXPORT_SYMBOL_GPL(iommu_fwspec_init);
1939 void iommu_fwspec_free(struct device *dev)
1941 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1944 fwnode_handle_put(fwspec->iommu_fwnode);
1946 dev->iommu_fwspec = NULL;
1949 EXPORT_SYMBOL_GPL(iommu_fwspec_free);
1951 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
1953 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1960 size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
1961 if (size > sizeof(*fwspec)) {
1962 fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL);
1966 dev->iommu_fwspec = fwspec;
1969 for (i = 0; i < num_ids; i++)
1970 fwspec->ids[fwspec->num_ids + i] = ids[i];
1972 fwspec->num_ids += num_ids;
1975 EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);