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);
216 list_del(&entry->list);
217 entry->start = new_start;
218 entry->length = new_end - new_start + 1;
219 iommu_insert_resv_region(entry, regions);
226 region = iommu_alloc_resv_region(new->start, new->length,
227 new->prot, new->type);
231 list_add_tail(®ion->list, pos);
237 iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
238 struct list_head *group_resv_regions)
240 struct iommu_resv_region *entry;
243 list_for_each_entry(entry, dev_resv_regions, list) {
244 ret = iommu_insert_resv_region(entry, group_resv_regions);
251 int iommu_get_group_resv_regions(struct iommu_group *group,
252 struct list_head *head)
254 struct group_device *device;
257 mutex_lock(&group->mutex);
258 list_for_each_entry(device, &group->devices, list) {
259 struct list_head dev_resv_regions;
261 INIT_LIST_HEAD(&dev_resv_regions);
262 iommu_get_resv_regions(device->dev, &dev_resv_regions);
263 ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
264 iommu_put_resv_regions(device->dev, &dev_resv_regions);
268 mutex_unlock(&group->mutex);
271 EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
273 static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
276 struct iommu_resv_region *region, *next;
277 struct list_head group_resv_regions;
280 INIT_LIST_HEAD(&group_resv_regions);
281 iommu_get_group_resv_regions(group, &group_resv_regions);
283 list_for_each_entry_safe(region, next, &group_resv_regions, list) {
284 str += sprintf(str, "0x%016llx 0x%016llx %s\n",
285 (long long int)region->start,
286 (long long int)(region->start +
288 iommu_group_resv_type_string[region->type]);
295 static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
297 static IOMMU_GROUP_ATTR(reserved_regions, 0444,
298 iommu_group_show_resv_regions, NULL);
300 static void iommu_group_release(struct kobject *kobj)
302 struct iommu_group *group = to_iommu_group(kobj);
304 pr_debug("Releasing group %d\n", group->id);
306 if (group->iommu_data_release)
307 group->iommu_data_release(group->iommu_data);
309 ida_simple_remove(&iommu_group_ida, group->id);
311 if (group->default_domain)
312 iommu_domain_free(group->default_domain);
318 static struct kobj_type iommu_group_ktype = {
319 .sysfs_ops = &iommu_group_sysfs_ops,
320 .release = iommu_group_release,
324 * iommu_group_alloc - Allocate a new group
325 * @name: Optional name to associate with group, visible in sysfs
327 * This function is called by an iommu driver to allocate a new iommu
328 * group. The iommu group represents the minimum granularity of the iommu.
329 * Upon successful return, the caller holds a reference to the supplied
330 * group in order to hold the group until devices are added. Use
331 * iommu_group_put() to release this extra reference count, allowing the
332 * group to be automatically reclaimed once it has no devices or external
335 struct iommu_group *iommu_group_alloc(void)
337 struct iommu_group *group;
340 group = kzalloc(sizeof(*group), GFP_KERNEL);
342 return ERR_PTR(-ENOMEM);
344 group->kobj.kset = iommu_group_kset;
345 mutex_init(&group->mutex);
346 INIT_LIST_HEAD(&group->devices);
347 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
349 ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);
356 ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
357 NULL, "%d", group->id);
359 ida_simple_remove(&iommu_group_ida, group->id);
364 group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
365 if (!group->devices_kobj) {
366 kobject_put(&group->kobj); /* triggers .release & free */
367 return ERR_PTR(-ENOMEM);
371 * The devices_kobj holds a reference on the group kobject, so
372 * as long as that exists so will the group. We can therefore
373 * use the devices_kobj for reference counting.
375 kobject_put(&group->kobj);
377 ret = iommu_group_create_file(group,
378 &iommu_group_attr_reserved_regions);
382 pr_debug("Allocated group %d\n", group->id);
386 EXPORT_SYMBOL_GPL(iommu_group_alloc);
388 struct iommu_group *iommu_group_get_by_id(int id)
390 struct kobject *group_kobj;
391 struct iommu_group *group;
394 if (!iommu_group_kset)
397 name = kasprintf(GFP_KERNEL, "%d", id);
401 group_kobj = kset_find_obj(iommu_group_kset, name);
407 group = container_of(group_kobj, struct iommu_group, kobj);
408 BUG_ON(group->id != id);
410 kobject_get(group->devices_kobj);
411 kobject_put(&group->kobj);
415 EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
418 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
421 * iommu drivers can store data in the group for use when doing iommu
422 * operations. This function provides a way to retrieve it. Caller
423 * should hold a group reference.
425 void *iommu_group_get_iommudata(struct iommu_group *group)
427 return group->iommu_data;
429 EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
432 * iommu_group_set_iommudata - set iommu_data for a group
434 * @iommu_data: new data
435 * @release: release function for iommu_data
437 * iommu drivers can store data in the group for use when doing iommu
438 * operations. This function provides a way to set the data after
439 * the group has been allocated. Caller should hold a group reference.
441 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
442 void (*release)(void *iommu_data))
444 group->iommu_data = iommu_data;
445 group->iommu_data_release = release;
447 EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
450 * iommu_group_set_name - set name for a group
454 * Allow iommu driver to set a name for a group. When set it will
455 * appear in a name attribute file under the group in sysfs.
457 int iommu_group_set_name(struct iommu_group *group, const char *name)
462 iommu_group_remove_file(group, &iommu_group_attr_name);
469 group->name = kstrdup(name, GFP_KERNEL);
473 ret = iommu_group_create_file(group, &iommu_group_attr_name);
482 EXPORT_SYMBOL_GPL(iommu_group_set_name);
484 static int iommu_group_create_direct_mappings(struct iommu_group *group,
487 struct iommu_domain *domain = group->default_domain;
488 struct iommu_resv_region *entry;
489 struct list_head mappings;
490 unsigned long pg_size;
493 if (!domain || domain->type != IOMMU_DOMAIN_DMA)
496 BUG_ON(!domain->pgsize_bitmap);
498 pg_size = 1UL << __ffs(domain->pgsize_bitmap);
499 INIT_LIST_HEAD(&mappings);
501 iommu_get_resv_regions(dev, &mappings);
503 /* We need to consider overlapping regions for different devices */
504 list_for_each_entry(entry, &mappings, list) {
505 dma_addr_t start, end, addr;
507 if (domain->ops->apply_resv_region)
508 domain->ops->apply_resv_region(dev, domain, entry);
510 start = ALIGN(entry->start, pg_size);
511 end = ALIGN(entry->start + entry->length, pg_size);
513 if (entry->type != IOMMU_RESV_DIRECT)
516 for (addr = start; addr < end; addr += pg_size) {
517 phys_addr_t phys_addr;
519 phys_addr = iommu_iova_to_phys(domain, addr);
523 ret = iommu_map(domain, addr, addr, pg_size, entry->prot);
531 iommu_put_resv_regions(dev, &mappings);
537 * iommu_group_add_device - add a device to an iommu group
538 * @group: the group into which to add the device (reference should be held)
541 * This function is called by an iommu driver to add a device into a
542 * group. Adding a device increments the group reference count.
544 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
547 struct group_device *device;
549 device = kzalloc(sizeof(*device), GFP_KERNEL);
555 ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
557 goto err_free_device;
559 device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
563 goto err_remove_link;
566 ret = sysfs_create_link_nowarn(group->devices_kobj,
567 &dev->kobj, device->name);
569 if (ret == -EEXIST && i >= 0) {
571 * Account for the slim chance of collision
572 * and append an instance to the name.
575 device->name = kasprintf(GFP_KERNEL, "%s.%d",
576 kobject_name(&dev->kobj), i++);
582 kobject_get(group->devices_kobj);
584 dev->iommu_group = group;
586 iommu_group_create_direct_mappings(group, dev);
588 mutex_lock(&group->mutex);
589 list_add_tail(&device->list, &group->devices);
591 ret = __iommu_attach_device(group->domain, dev);
592 mutex_unlock(&group->mutex);
596 /* Notify any listeners about change to group. */
597 blocking_notifier_call_chain(&group->notifier,
598 IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
600 trace_add_device_to_group(group->id, dev);
602 pr_info("Adding device %s to group %d\n", dev_name(dev), group->id);
607 mutex_lock(&group->mutex);
608 list_del(&device->list);
609 mutex_unlock(&group->mutex);
610 dev->iommu_group = NULL;
611 kobject_put(group->devices_kobj);
615 sysfs_remove_link(&dev->kobj, "iommu_group");
618 pr_err("Failed to add device %s to group %d: %d\n", dev_name(dev), group->id, ret);
621 EXPORT_SYMBOL_GPL(iommu_group_add_device);
624 * iommu_group_remove_device - remove a device from it's current group
625 * @dev: device to be removed
627 * This function is called by an iommu driver to remove the device from
628 * it's current group. This decrements the iommu group reference count.
630 void iommu_group_remove_device(struct device *dev)
632 struct iommu_group *group = dev->iommu_group;
633 struct group_device *tmp_device, *device = NULL;
635 pr_info("Removing device %s from group %d\n", dev_name(dev), group->id);
637 /* Pre-notify listeners that a device is being removed. */
638 blocking_notifier_call_chain(&group->notifier,
639 IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
641 mutex_lock(&group->mutex);
642 list_for_each_entry(tmp_device, &group->devices, list) {
643 if (tmp_device->dev == dev) {
645 list_del(&device->list);
649 mutex_unlock(&group->mutex);
654 sysfs_remove_link(group->devices_kobj, device->name);
655 sysfs_remove_link(&dev->kobj, "iommu_group");
657 trace_remove_device_from_group(group->id, dev);
661 dev->iommu_group = NULL;
662 kobject_put(group->devices_kobj);
664 EXPORT_SYMBOL_GPL(iommu_group_remove_device);
666 static int iommu_group_device_count(struct iommu_group *group)
668 struct group_device *entry;
671 list_for_each_entry(entry, &group->devices, list)
678 * iommu_group_for_each_dev - iterate over each device in the group
680 * @data: caller opaque data to be passed to callback function
681 * @fn: caller supplied callback function
683 * This function is called by group users to iterate over group devices.
684 * Callers should hold a reference count to the group during callback.
685 * The group->mutex is held across callbacks, which will block calls to
686 * iommu_group_add/remove_device.
688 static int __iommu_group_for_each_dev(struct iommu_group *group, void *data,
689 int (*fn)(struct device *, void *))
691 struct group_device *device;
694 list_for_each_entry(device, &group->devices, list) {
695 ret = fn(device->dev, data);
703 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
704 int (*fn)(struct device *, void *))
708 mutex_lock(&group->mutex);
709 ret = __iommu_group_for_each_dev(group, data, fn);
710 mutex_unlock(&group->mutex);
714 EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
717 * iommu_group_get - Return the group for a device and increment reference
718 * @dev: get the group that this device belongs to
720 * This function is called by iommu drivers and users to get the group
721 * for the specified device. If found, the group is returned and the group
722 * reference in incremented, else NULL.
724 struct iommu_group *iommu_group_get(struct device *dev)
726 struct iommu_group *group = dev->iommu_group;
729 kobject_get(group->devices_kobj);
733 EXPORT_SYMBOL_GPL(iommu_group_get);
736 * iommu_group_ref_get - Increment reference on a group
737 * @group: the group to use, must not be NULL
739 * This function is called by iommu drivers to take additional references on an
740 * existing group. Returns the given group for convenience.
742 struct iommu_group *iommu_group_ref_get(struct iommu_group *group)
744 kobject_get(group->devices_kobj);
749 * iommu_group_put - Decrement group reference
750 * @group: the group to use
752 * This function is called by iommu drivers and users to release the
753 * iommu group. Once the reference count is zero, the group is released.
755 void iommu_group_put(struct iommu_group *group)
758 kobject_put(group->devices_kobj);
760 EXPORT_SYMBOL_GPL(iommu_group_put);
763 * iommu_group_register_notifier - Register a notifier for group changes
764 * @group: the group to watch
765 * @nb: notifier block to signal
767 * This function allows iommu group users to track changes in a group.
768 * See include/linux/iommu.h for actions sent via this notifier. Caller
769 * should hold a reference to the group throughout notifier registration.
771 int iommu_group_register_notifier(struct iommu_group *group,
772 struct notifier_block *nb)
774 return blocking_notifier_chain_register(&group->notifier, nb);
776 EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
779 * iommu_group_unregister_notifier - Unregister a notifier
780 * @group: the group to watch
781 * @nb: notifier block to signal
783 * Unregister a previously registered group notifier block.
785 int iommu_group_unregister_notifier(struct iommu_group *group,
786 struct notifier_block *nb)
788 return blocking_notifier_chain_unregister(&group->notifier, nb);
790 EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
793 * iommu_group_id - Return ID for a group
794 * @group: the group to ID
796 * Return the unique ID for the group matching the sysfs group number.
798 int iommu_group_id(struct iommu_group *group)
802 EXPORT_SYMBOL_GPL(iommu_group_id);
804 static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
805 unsigned long *devfns);
808 * To consider a PCI device isolated, we require ACS to support Source
809 * Validation, Request Redirection, Completer Redirection, and Upstream
810 * Forwarding. This effectively means that devices cannot spoof their
811 * requester ID, requests and completions cannot be redirected, and all
812 * transactions are forwarded upstream, even as it passes through a
813 * bridge where the target device is downstream.
815 #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
818 * For multifunction devices which are not isolated from each other, find
819 * all the other non-isolated functions and look for existing groups. For
820 * each function, we also need to look for aliases to or from other devices
821 * that may already have a group.
823 static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev,
824 unsigned long *devfns)
826 struct pci_dev *tmp = NULL;
827 struct iommu_group *group;
829 if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS))
832 for_each_pci_dev(tmp) {
833 if (tmp == pdev || tmp->bus != pdev->bus ||
834 PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) ||
835 pci_acs_enabled(tmp, REQ_ACS_FLAGS))
838 group = get_pci_alias_group(tmp, devfns);
849 * Look for aliases to or from the given device for existing groups. DMA
850 * aliases are only supported on the same bus, therefore the search
851 * space is quite small (especially since we're really only looking at pcie
852 * device, and therefore only expect multiple slots on the root complex or
853 * downstream switch ports). It's conceivable though that a pair of
854 * multifunction devices could have aliases between them that would cause a
855 * loop. To prevent this, we use a bitmap to track where we've been.
857 static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
858 unsigned long *devfns)
860 struct pci_dev *tmp = NULL;
861 struct iommu_group *group;
863 if (test_and_set_bit(pdev->devfn & 0xff, devfns))
866 group = iommu_group_get(&pdev->dev);
870 for_each_pci_dev(tmp) {
871 if (tmp == pdev || tmp->bus != pdev->bus)
874 /* We alias them or they alias us */
875 if (pci_devs_are_dma_aliases(pdev, tmp)) {
876 group = get_pci_alias_group(tmp, devfns);
882 group = get_pci_function_alias_group(tmp, devfns);
893 struct group_for_pci_data {
894 struct pci_dev *pdev;
895 struct iommu_group *group;
899 * DMA alias iterator callback, return the last seen device. Stop and return
900 * the IOMMU group if we find one along the way.
902 static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
904 struct group_for_pci_data *data = opaque;
907 data->group = iommu_group_get(&pdev->dev);
909 return data->group != NULL;
913 * Generic device_group call-back function. It just allocates one
914 * iommu-group per device.
916 struct iommu_group *generic_device_group(struct device *dev)
918 struct iommu_group *group;
920 group = iommu_group_alloc();
928 * Use standard PCI bus topology, isolation features, and DMA alias quirks
929 * to find or create an IOMMU group for a device.
931 struct iommu_group *pci_device_group(struct device *dev)
933 struct pci_dev *pdev = to_pci_dev(dev);
934 struct group_for_pci_data data;
936 struct iommu_group *group = NULL;
937 u64 devfns[4] = { 0 };
939 if (WARN_ON(!dev_is_pci(dev)))
940 return ERR_PTR(-EINVAL);
943 * Find the upstream DMA alias for the device. A device must not
944 * be aliased due to topology in order to have its own IOMMU group.
945 * If we find an alias along the way that already belongs to a
948 if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data))
954 * Continue upstream from the point of minimum IOMMU granularity
955 * due to aliases to the point where devices are protected from
956 * peer-to-peer DMA by PCI ACS. Again, if we find an existing
959 for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
963 if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
968 group = iommu_group_get(&pdev->dev);
974 * Look for existing groups on device aliases. If we alias another
975 * device or another device aliases us, use the same group.
977 group = get_pci_alias_group(pdev, (unsigned long *)devfns);
982 * Look for existing groups on non-isolated functions on the same
983 * slot and aliases of those funcions, if any. No need to clear
984 * the search bitmap, the tested devfns are still valid.
986 group = get_pci_function_alias_group(pdev, (unsigned long *)devfns);
990 /* No shared group found, allocate new */
991 group = iommu_group_alloc();
999 * iommu_group_get_for_dev - Find or create the IOMMU group for a device
1000 * @dev: target device
1002 * This function is intended to be called by IOMMU drivers and extended to
1003 * support common, bus-defined algorithms when determining or creating the
1004 * IOMMU group for a device. On success, the caller will hold a reference
1005 * to the returned IOMMU group, which will already include the provided
1006 * device. The reference should be released with iommu_group_put().
1008 struct iommu_group *iommu_group_get_for_dev(struct device *dev)
1010 const struct iommu_ops *ops = dev->bus->iommu_ops;
1011 struct iommu_group *group;
1014 group = iommu_group_get(dev);
1018 group = ERR_PTR(-EINVAL);
1020 if (ops && ops->device_group)
1021 group = ops->device_group(dev);
1027 * Try to allocate a default domain - needs support from the
1030 if (!group->default_domain) {
1031 struct iommu_domain *dom;
1033 dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
1034 if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
1036 "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
1037 iommu_def_domain_type);
1038 dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
1041 group->default_domain = dom;
1043 group->domain = dom;
1046 ret = iommu_group_add_device(group, dev);
1048 iommu_group_put(group);
1049 return ERR_PTR(ret);
1055 struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
1057 return group->default_domain;
1060 static int add_iommu_group(struct device *dev, void *data)
1062 struct iommu_callback_data *cb = data;
1063 const struct iommu_ops *ops = cb->ops;
1066 if (!ops->add_device)
1069 WARN_ON(dev->iommu_group);
1071 ret = ops->add_device(dev);
1074 * We ignore -ENODEV errors for now, as they just mean that the
1075 * device is not translated by an IOMMU. We still care about
1076 * other errors and fail to initialize when they happen.
1084 static int remove_iommu_group(struct device *dev, void *data)
1086 struct iommu_callback_data *cb = data;
1087 const struct iommu_ops *ops = cb->ops;
1089 if (ops->remove_device && dev->iommu_group)
1090 ops->remove_device(dev);
1095 static int iommu_bus_notifier(struct notifier_block *nb,
1096 unsigned long action, void *data)
1098 struct device *dev = data;
1099 const struct iommu_ops *ops = dev->bus->iommu_ops;
1100 struct iommu_group *group;
1101 unsigned long group_action = 0;
1104 * ADD/DEL call into iommu driver ops if provided, which may
1105 * result in ADD/DEL notifiers to group->notifier
1107 if (action == BUS_NOTIFY_ADD_DEVICE) {
1108 if (ops->add_device) {
1111 ret = ops->add_device(dev);
1112 return (ret) ? NOTIFY_DONE : NOTIFY_OK;
1114 } else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
1115 if (ops->remove_device && dev->iommu_group) {
1116 ops->remove_device(dev);
1122 * Remaining BUS_NOTIFYs get filtered and republished to the
1123 * group, if anyone is listening
1125 group = iommu_group_get(dev);
1130 case BUS_NOTIFY_BIND_DRIVER:
1131 group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
1133 case BUS_NOTIFY_BOUND_DRIVER:
1134 group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
1136 case BUS_NOTIFY_UNBIND_DRIVER:
1137 group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
1139 case BUS_NOTIFY_UNBOUND_DRIVER:
1140 group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
1145 blocking_notifier_call_chain(&group->notifier,
1148 iommu_group_put(group);
1152 static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
1155 struct notifier_block *nb;
1156 struct iommu_callback_data cb = {
1160 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
1164 nb->notifier_call = iommu_bus_notifier;
1166 err = bus_register_notifier(bus, nb);
1170 err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
1179 bus_for_each_dev(bus, NULL, &cb, remove_iommu_group);
1180 bus_unregister_notifier(bus, nb);
1189 * bus_set_iommu - set iommu-callbacks for the bus
1191 * @ops: the callbacks provided by the iommu-driver
1193 * This function is called by an iommu driver to set the iommu methods
1194 * used for a particular bus. Drivers for devices on that bus can use
1195 * the iommu-api after these ops are registered.
1196 * This special function is needed because IOMMUs are usually devices on
1197 * the bus itself, so the iommu drivers are not initialized when the bus
1198 * is set up. With this function the iommu-driver can set the iommu-ops
1201 int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
1205 if (bus->iommu_ops != NULL)
1208 bus->iommu_ops = ops;
1210 /* Do IOMMU specific setup for this bus-type */
1211 err = iommu_bus_init(bus, ops);
1213 bus->iommu_ops = NULL;
1217 EXPORT_SYMBOL_GPL(bus_set_iommu);
1219 bool iommu_present(struct bus_type *bus)
1221 return bus->iommu_ops != NULL;
1223 EXPORT_SYMBOL_GPL(iommu_present);
1225 bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
1227 if (!bus->iommu_ops || !bus->iommu_ops->capable)
1230 return bus->iommu_ops->capable(cap);
1232 EXPORT_SYMBOL_GPL(iommu_capable);
1235 * iommu_set_fault_handler() - set a fault handler for an iommu domain
1236 * @domain: iommu domain
1237 * @handler: fault handler
1238 * @token: user data, will be passed back to the fault handler
1240 * This function should be used by IOMMU users which want to be notified
1241 * whenever an IOMMU fault happens.
1243 * The fault handler itself should return 0 on success, and an appropriate
1244 * error code otherwise.
1246 void iommu_set_fault_handler(struct iommu_domain *domain,
1247 iommu_fault_handler_t handler,
1252 domain->handler = handler;
1253 domain->handler_token = token;
1255 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
1257 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
1260 struct iommu_domain *domain;
1262 if (bus == NULL || bus->iommu_ops == NULL)
1265 domain = bus->iommu_ops->domain_alloc(type);
1269 domain->ops = bus->iommu_ops;
1270 domain->type = type;
1271 /* Assume all sizes by default; the driver may override this later */
1272 domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap;
1277 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
1279 return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
1281 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
1283 void iommu_domain_free(struct iommu_domain *domain)
1285 domain->ops->domain_free(domain);
1287 EXPORT_SYMBOL_GPL(iommu_domain_free);
1289 static int __iommu_attach_device(struct iommu_domain *domain,
1293 if (unlikely(domain->ops->attach_dev == NULL))
1296 ret = domain->ops->attach_dev(domain, dev);
1298 trace_attach_device_to_domain(dev);
1302 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
1304 struct iommu_group *group;
1307 group = iommu_group_get(dev);
1308 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1310 return __iommu_attach_device(domain, dev);
1313 * We have a group - lock it to make sure the device-count doesn't
1314 * change while we are attaching
1316 mutex_lock(&group->mutex);
1318 if (iommu_group_device_count(group) != 1)
1321 ret = __iommu_attach_group(domain, group);
1324 mutex_unlock(&group->mutex);
1325 iommu_group_put(group);
1329 EXPORT_SYMBOL_GPL(iommu_attach_device);
1331 static void __iommu_detach_device(struct iommu_domain *domain,
1334 if (unlikely(domain->ops->detach_dev == NULL))
1337 domain->ops->detach_dev(domain, dev);
1338 trace_detach_device_from_domain(dev);
1341 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
1343 struct iommu_group *group;
1345 group = iommu_group_get(dev);
1346 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1348 return __iommu_detach_device(domain, dev);
1350 mutex_lock(&group->mutex);
1351 if (iommu_group_device_count(group) != 1) {
1356 __iommu_detach_group(domain, group);
1359 mutex_unlock(&group->mutex);
1360 iommu_group_put(group);
1362 EXPORT_SYMBOL_GPL(iommu_detach_device);
1364 struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
1366 struct iommu_domain *domain;
1367 struct iommu_group *group;
1369 group = iommu_group_get(dev);
1370 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1374 domain = group->domain;
1376 iommu_group_put(group);
1380 EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
1383 * IOMMU groups are really the natrual working unit of the IOMMU, but
1384 * the IOMMU API works on domains and devices. Bridge that gap by
1385 * iterating over the devices in a group. Ideally we'd have a single
1386 * device which represents the requestor ID of the group, but we also
1387 * allow IOMMU drivers to create policy defined minimum sets, where
1388 * the physical hardware may be able to distiguish members, but we
1389 * wish to group them at a higher level (ex. untrusted multi-function
1390 * PCI devices). Thus we attach each device.
1392 static int iommu_group_do_attach_device(struct device *dev, void *data)
1394 struct iommu_domain *domain = data;
1396 return __iommu_attach_device(domain, dev);
1399 static int __iommu_attach_group(struct iommu_domain *domain,
1400 struct iommu_group *group)
1404 if (group->default_domain && group->domain != group->default_domain)
1407 ret = __iommu_group_for_each_dev(group, domain,
1408 iommu_group_do_attach_device);
1410 group->domain = domain;
1415 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
1419 mutex_lock(&group->mutex);
1420 ret = __iommu_attach_group(domain, group);
1421 mutex_unlock(&group->mutex);
1425 EXPORT_SYMBOL_GPL(iommu_attach_group);
1427 static int iommu_group_do_detach_device(struct device *dev, void *data)
1429 struct iommu_domain *domain = data;
1431 __iommu_detach_device(domain, dev);
1436 static void __iommu_detach_group(struct iommu_domain *domain,
1437 struct iommu_group *group)
1441 if (!group->default_domain) {
1442 __iommu_group_for_each_dev(group, domain,
1443 iommu_group_do_detach_device);
1444 group->domain = NULL;
1448 if (group->domain == group->default_domain)
1451 /* Detach by re-attaching to the default domain */
1452 ret = __iommu_group_for_each_dev(group, group->default_domain,
1453 iommu_group_do_attach_device);
1457 group->domain = group->default_domain;
1460 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
1462 mutex_lock(&group->mutex);
1463 __iommu_detach_group(domain, group);
1464 mutex_unlock(&group->mutex);
1466 EXPORT_SYMBOL_GPL(iommu_detach_group);
1468 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
1470 if (unlikely(domain->ops->iova_to_phys == NULL))
1473 return domain->ops->iova_to_phys(domain, iova);
1475 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
1477 static size_t iommu_pgsize(struct iommu_domain *domain,
1478 unsigned long addr_merge, size_t size)
1480 unsigned int pgsize_idx;
1483 /* Max page size that still fits into 'size' */
1484 pgsize_idx = __fls(size);
1486 /* need to consider alignment requirements ? */
1487 if (likely(addr_merge)) {
1488 /* Max page size allowed by address */
1489 unsigned int align_pgsize_idx = __ffs(addr_merge);
1490 pgsize_idx = min(pgsize_idx, align_pgsize_idx);
1493 /* build a mask of acceptable page sizes */
1494 pgsize = (1UL << (pgsize_idx + 1)) - 1;
1496 /* throw away page sizes not supported by the hardware */
1497 pgsize &= domain->pgsize_bitmap;
1499 /* make sure we're still sane */
1502 /* pick the biggest page */
1503 pgsize_idx = __fls(pgsize);
1504 pgsize = 1UL << pgsize_idx;
1509 int iommu_map(struct iommu_domain *domain, unsigned long iova,
1510 phys_addr_t paddr, size_t size, int prot)
1512 unsigned long orig_iova = iova;
1513 unsigned int min_pagesz;
1514 size_t orig_size = size;
1515 phys_addr_t orig_paddr = paddr;
1518 if (unlikely(domain->ops->map == NULL ||
1519 domain->pgsize_bitmap == 0UL))
1522 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
1525 /* find out the minimum page size supported */
1526 min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
1529 * both the virtual address and the physical one, as well as
1530 * the size of the mapping, must be aligned (at least) to the
1531 * size of the smallest page supported by the hardware
1533 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
1534 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
1535 iova, &paddr, size, min_pagesz);
1539 pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
1542 size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
1544 pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
1545 iova, &paddr, pgsize);
1547 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
1556 /* unroll mapping in case something went wrong */
1558 iommu_unmap(domain, orig_iova, orig_size - size);
1560 trace_map(orig_iova, orig_paddr, orig_size);
1564 EXPORT_SYMBOL_GPL(iommu_map);
1566 size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
1568 size_t unmapped_page, unmapped = 0;
1569 unsigned int min_pagesz;
1570 unsigned long orig_iova = iova;
1572 if (unlikely(domain->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 = domain->ops->unmap(domain, iova, pgsize);
1606 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
1607 iova, unmapped_page);
1609 iova += unmapped_page;
1610 unmapped += unmapped_page;
1613 trace_unmap(orig_iova, size, unmapped);
1616 EXPORT_SYMBOL_GPL(iommu_unmap);
1618 size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
1619 struct scatterlist *sg, unsigned int nents, int prot)
1621 struct scatterlist *s;
1623 unsigned int i, min_pagesz;
1626 if (unlikely(domain->pgsize_bitmap == 0UL))
1629 min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
1631 for_each_sg(sg, s, nents, i) {
1632 phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
1635 * We are mapping on IOMMU page boundaries, so offset within
1636 * the page must be 0. However, the IOMMU may support pages
1637 * smaller than PAGE_SIZE, so s->offset may still represent
1638 * an offset of that boundary within the CPU page.
1640 if (!IS_ALIGNED(s->offset, min_pagesz))
1643 ret = iommu_map(domain, iova + mapped, phys, s->length, prot);
1647 mapped += s->length;
1653 /* undo mappings already done */
1654 iommu_unmap(domain, iova, mapped);
1659 EXPORT_SYMBOL_GPL(default_iommu_map_sg);
1661 int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
1662 phys_addr_t paddr, u64 size, int prot)
1664 if (unlikely(domain->ops->domain_window_enable == NULL))
1667 return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
1670 EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
1672 void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
1674 if (unlikely(domain->ops->domain_window_disable == NULL))
1677 return domain->ops->domain_window_disable(domain, wnd_nr);
1679 EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
1682 * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
1683 * @domain: the iommu domain where the fault has happened
1684 * @dev: the device where the fault has happened
1685 * @iova: the faulting address
1686 * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
1688 * This function should be called by the low-level IOMMU implementations
1689 * whenever IOMMU faults happen, to allow high-level users, that are
1690 * interested in such events, to know about them.
1692 * This event may be useful for several possible use cases:
1693 * - mere logging of the event
1694 * - dynamic TLB/PTE loading
1695 * - if restarting of the faulting device is required
1697 * Returns 0 on success and an appropriate error code otherwise (if dynamic
1698 * PTE/TLB loading will one day be supported, implementations will be able
1699 * to tell whether it succeeded or not according to this return value).
1701 * Specifically, -ENOSYS is returned if a fault handler isn't installed
1702 * (though fault handlers can also return -ENOSYS, in case they want to
1703 * elicit the default behavior of the IOMMU drivers).
1705 int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
1706 unsigned long iova, int flags)
1711 * if upper layers showed interest and installed a fault handler,
1714 if (domain->handler)
1715 ret = domain->handler(domain, dev, iova, flags,
1716 domain->handler_token);
1718 trace_io_page_fault(dev, iova, flags);
1721 EXPORT_SYMBOL_GPL(report_iommu_fault);
1723 static int __init iommu_init(void)
1725 iommu_group_kset = kset_create_and_add("iommu_groups",
1727 BUG_ON(!iommu_group_kset);
1731 core_initcall(iommu_init);
1733 int iommu_domain_get_attr(struct iommu_domain *domain,
1734 enum iommu_attr attr, void *data)
1736 struct iommu_domain_geometry *geometry;
1742 case DOMAIN_ATTR_GEOMETRY:
1744 *geometry = domain->geometry;
1747 case DOMAIN_ATTR_PAGING:
1749 *paging = (domain->pgsize_bitmap != 0UL);
1751 case DOMAIN_ATTR_WINDOWS:
1754 if (domain->ops->domain_get_windows != NULL)
1755 *count = domain->ops->domain_get_windows(domain);
1761 if (!domain->ops->domain_get_attr)
1764 ret = domain->ops->domain_get_attr(domain, attr, data);
1769 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
1771 int iommu_domain_set_attr(struct iommu_domain *domain,
1772 enum iommu_attr attr, void *data)
1778 case DOMAIN_ATTR_WINDOWS:
1781 if (domain->ops->domain_set_windows != NULL)
1782 ret = domain->ops->domain_set_windows(domain, *count);
1788 if (domain->ops->domain_set_attr == NULL)
1791 ret = domain->ops->domain_set_attr(domain, attr, data);
1796 EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
1798 void iommu_get_resv_regions(struct device *dev, struct list_head *list)
1800 const struct iommu_ops *ops = dev->bus->iommu_ops;
1802 if (ops && ops->get_resv_regions)
1803 ops->get_resv_regions(dev, list);
1806 void iommu_put_resv_regions(struct device *dev, struct list_head *list)
1808 const struct iommu_ops *ops = dev->bus->iommu_ops;
1810 if (ops && ops->put_resv_regions)
1811 ops->put_resv_regions(dev, list);
1814 struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
1815 size_t length, int prot,
1816 enum iommu_resv_type type)
1818 struct iommu_resv_region *region;
1820 region = kzalloc(sizeof(*region), GFP_KERNEL);
1824 INIT_LIST_HEAD(®ion->list);
1825 region->start = start;
1826 region->length = length;
1827 region->prot = prot;
1828 region->type = type;
1832 /* Request that a device is direct mapped by the IOMMU */
1833 int iommu_request_dm_for_dev(struct device *dev)
1835 struct iommu_domain *dm_domain;
1836 struct iommu_group *group;
1839 /* Device must already be in a group before calling this function */
1840 group = iommu_group_get_for_dev(dev);
1842 return PTR_ERR(group);
1844 mutex_lock(&group->mutex);
1846 /* Check if the default domain is already direct mapped */
1848 if (group->default_domain &&
1849 group->default_domain->type == IOMMU_DOMAIN_IDENTITY)
1852 /* Don't change mappings of existing devices */
1854 if (iommu_group_device_count(group) != 1)
1857 /* Allocate a direct mapped domain */
1859 dm_domain = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_IDENTITY);
1863 /* Attach the device to the domain */
1864 ret = __iommu_attach_group(dm_domain, group);
1866 iommu_domain_free(dm_domain);
1870 /* Make the direct mapped domain the default for this group */
1871 if (group->default_domain)
1872 iommu_domain_free(group->default_domain);
1873 group->default_domain = dm_domain;
1875 pr_info("Using direct mapping for device %s\n", dev_name(dev));
1879 mutex_unlock(&group->mutex);
1880 iommu_group_put(group);
1885 const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
1887 const struct iommu_ops *ops = NULL;
1888 struct iommu_device *iommu;
1890 spin_lock(&iommu_device_lock);
1891 list_for_each_entry(iommu, &iommu_device_list, list)
1892 if (iommu->fwnode == fwnode) {
1896 spin_unlock(&iommu_device_lock);
1900 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
1901 const struct iommu_ops *ops)
1903 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1906 return ops == fwspec->ops ? 0 : -EINVAL;
1908 fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
1912 of_node_get(to_of_node(iommu_fwnode));
1913 fwspec->iommu_fwnode = iommu_fwnode;
1915 dev->iommu_fwspec = fwspec;
1918 EXPORT_SYMBOL_GPL(iommu_fwspec_init);
1920 void iommu_fwspec_free(struct device *dev)
1922 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1925 fwnode_handle_put(fwspec->iommu_fwnode);
1927 dev->iommu_fwspec = NULL;
1930 EXPORT_SYMBOL_GPL(iommu_fwspec_free);
1932 int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
1934 struct iommu_fwspec *fwspec = dev->iommu_fwspec;
1941 size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
1942 if (size > sizeof(*fwspec)) {
1943 fwspec = krealloc(dev->iommu_fwspec, size, GFP_KERNEL);
1947 dev->iommu_fwspec = fwspec;
1950 for (i = 0; i < num_ids; i++)
1951 fwspec->ids[fwspec->num_ids + i] = ids[i];
1953 fwspec->num_ids += num_ids;
1956 EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);