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",
78 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
79 struct iommu_group_attribute iommu_group_attr_##_name = \
80 __ATTR(_name, _mode, _show, _store)
82 #define to_iommu_group_attr(_attr) \
83 container_of(_attr, struct iommu_group_attribute, attr)
84 #define to_iommu_group(_kobj) \
85 container_of(_kobj, struct iommu_group, kobj)
87 static LIST_HEAD(iommu_device_list
);
88 static DEFINE_SPINLOCK(iommu_device_lock
);
90 int iommu_device_register(struct iommu_device
*iommu
)
92 spin_lock(&iommu_device_lock
);
93 list_add_tail(&iommu
->list
, &iommu_device_list
);
94 spin_unlock(&iommu_device_lock
);
99 void iommu_device_unregister(struct iommu_device
*iommu
)
101 spin_lock(&iommu_device_lock
);
102 list_del(&iommu
->list
);
103 spin_unlock(&iommu_device_lock
);
106 static struct iommu_domain
*__iommu_domain_alloc(struct bus_type
*bus
,
108 static int __iommu_attach_device(struct iommu_domain
*domain
,
110 static int __iommu_attach_group(struct iommu_domain
*domain
,
111 struct iommu_group
*group
);
112 static void __iommu_detach_group(struct iommu_domain
*domain
,
113 struct iommu_group
*group
);
115 static int __init
iommu_set_def_domain_type(char *str
)
119 if (!str
|| strtobool(str
, &pt
))
122 iommu_def_domain_type
= pt
? IOMMU_DOMAIN_IDENTITY
: IOMMU_DOMAIN_DMA
;
125 early_param("iommu.passthrough", iommu_set_def_domain_type
);
127 static ssize_t
iommu_group_attr_show(struct kobject
*kobj
,
128 struct attribute
*__attr
, char *buf
)
130 struct iommu_group_attribute
*attr
= to_iommu_group_attr(__attr
);
131 struct iommu_group
*group
= to_iommu_group(kobj
);
135 ret
= attr
->show(group
, buf
);
139 static ssize_t
iommu_group_attr_store(struct kobject
*kobj
,
140 struct attribute
*__attr
,
141 const char *buf
, size_t count
)
143 struct iommu_group_attribute
*attr
= to_iommu_group_attr(__attr
);
144 struct iommu_group
*group
= to_iommu_group(kobj
);
148 ret
= attr
->store(group
, buf
, count
);
152 static const struct sysfs_ops iommu_group_sysfs_ops
= {
153 .show
= iommu_group_attr_show
,
154 .store
= iommu_group_attr_store
,
157 static int iommu_group_create_file(struct iommu_group
*group
,
158 struct iommu_group_attribute
*attr
)
160 return sysfs_create_file(&group
->kobj
, &attr
->attr
);
163 static void iommu_group_remove_file(struct iommu_group
*group
,
164 struct iommu_group_attribute
*attr
)
166 sysfs_remove_file(&group
->kobj
, &attr
->attr
);
169 static ssize_t
iommu_group_show_name(struct iommu_group
*group
, char *buf
)
171 return sprintf(buf
, "%s\n", group
->name
);
175 * iommu_insert_resv_region - Insert a new region in the
176 * list of reserved regions.
177 * @new: new region to insert
178 * @regions: list of regions
180 * The new element is sorted by address with respect to the other
181 * regions of the same type. In case it overlaps with another
182 * region of the same type, regions are merged. In case it
183 * overlaps with another region of different type, regions are
186 static int iommu_insert_resv_region(struct iommu_resv_region
*new,
187 struct list_head
*regions
)
189 struct iommu_resv_region
*region
;
190 phys_addr_t start
= new->start
;
191 phys_addr_t end
= new->start
+ new->length
- 1;
192 struct list_head
*pos
= regions
->next
;
194 while (pos
!= regions
) {
195 struct iommu_resv_region
*entry
=
196 list_entry(pos
, struct iommu_resv_region
, list
);
197 phys_addr_t a
= entry
->start
;
198 phys_addr_t b
= entry
->start
+ entry
->length
- 1;
199 int type
= entry
->type
;
203 } else if (start
> b
) {
205 } else if ((start
>= a
) && (end
<= b
)) {
206 if (new->type
== type
)
211 if (new->type
== type
) {
212 phys_addr_t new_start
= min(a
, start
);
213 phys_addr_t new_end
= max(b
, end
);
215 list_del(&entry
->list
);
216 entry
->start
= new_start
;
217 entry
->length
= new_end
- new_start
+ 1;
218 iommu_insert_resv_region(entry
, regions
);
225 region
= iommu_alloc_resv_region(new->start
, new->length
,
226 new->prot
, new->type
);
230 list_add_tail(®ion
->list
, pos
);
236 iommu_insert_device_resv_regions(struct list_head
*dev_resv_regions
,
237 struct list_head
*group_resv_regions
)
239 struct iommu_resv_region
*entry
;
242 list_for_each_entry(entry
, dev_resv_regions
, list
) {
243 ret
= iommu_insert_resv_region(entry
, group_resv_regions
);
250 int iommu_get_group_resv_regions(struct iommu_group
*group
,
251 struct list_head
*head
)
253 struct group_device
*device
;
256 mutex_lock(&group
->mutex
);
257 list_for_each_entry(device
, &group
->devices
, list
) {
258 struct list_head dev_resv_regions
;
260 INIT_LIST_HEAD(&dev_resv_regions
);
261 iommu_get_resv_regions(device
->dev
, &dev_resv_regions
);
262 ret
= iommu_insert_device_resv_regions(&dev_resv_regions
, head
);
263 iommu_put_resv_regions(device
->dev
, &dev_resv_regions
);
267 mutex_unlock(&group
->mutex
);
270 EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions
);
272 static ssize_t
iommu_group_show_resv_regions(struct iommu_group
*group
,
275 struct iommu_resv_region
*region
, *next
;
276 struct list_head group_resv_regions
;
279 INIT_LIST_HEAD(&group_resv_regions
);
280 iommu_get_group_resv_regions(group
, &group_resv_regions
);
282 list_for_each_entry_safe(region
, next
, &group_resv_regions
, list
) {
283 str
+= sprintf(str
, "0x%016llx 0x%016llx %s\n",
284 (long long int)region
->start
,
285 (long long int)(region
->start
+
287 iommu_group_resv_type_string
[region
->type
]);
294 static IOMMU_GROUP_ATTR(name
, S_IRUGO
, iommu_group_show_name
, NULL
);
296 static IOMMU_GROUP_ATTR(reserved_regions
, 0444,
297 iommu_group_show_resv_regions
, NULL
);
299 static void iommu_group_release(struct kobject
*kobj
)
301 struct iommu_group
*group
= to_iommu_group(kobj
);
303 pr_debug("Releasing group %d\n", group
->id
);
305 if (group
->iommu_data_release
)
306 group
->iommu_data_release(group
->iommu_data
);
308 ida_simple_remove(&iommu_group_ida
, group
->id
);
310 if (group
->default_domain
)
311 iommu_domain_free(group
->default_domain
);
317 static struct kobj_type iommu_group_ktype
= {
318 .sysfs_ops
= &iommu_group_sysfs_ops
,
319 .release
= iommu_group_release
,
323 * iommu_group_alloc - Allocate a new group
324 * @name: Optional name to associate with group, visible in sysfs
326 * This function is called by an iommu driver to allocate a new iommu
327 * group. The iommu group represents the minimum granularity of the iommu.
328 * Upon successful return, the caller holds a reference to the supplied
329 * group in order to hold the group until devices are added. Use
330 * iommu_group_put() to release this extra reference count, allowing the
331 * group to be automatically reclaimed once it has no devices or external
334 struct iommu_group
*iommu_group_alloc(void)
336 struct iommu_group
*group
;
339 group
= kzalloc(sizeof(*group
), GFP_KERNEL
);
341 return ERR_PTR(-ENOMEM
);
343 group
->kobj
.kset
= iommu_group_kset
;
344 mutex_init(&group
->mutex
);
345 INIT_LIST_HEAD(&group
->devices
);
346 BLOCKING_INIT_NOTIFIER_HEAD(&group
->notifier
);
348 ret
= ida_simple_get(&iommu_group_ida
, 0, 0, GFP_KERNEL
);
355 ret
= kobject_init_and_add(&group
->kobj
, &iommu_group_ktype
,
356 NULL
, "%d", group
->id
);
358 ida_simple_remove(&iommu_group_ida
, group
->id
);
363 group
->devices_kobj
= kobject_create_and_add("devices", &group
->kobj
);
364 if (!group
->devices_kobj
) {
365 kobject_put(&group
->kobj
); /* triggers .release & free */
366 return ERR_PTR(-ENOMEM
);
370 * The devices_kobj holds a reference on the group kobject, so
371 * as long as that exists so will the group. We can therefore
372 * use the devices_kobj for reference counting.
374 kobject_put(&group
->kobj
);
376 ret
= iommu_group_create_file(group
,
377 &iommu_group_attr_reserved_regions
);
381 pr_debug("Allocated group %d\n", group
->id
);
385 EXPORT_SYMBOL_GPL(iommu_group_alloc
);
387 struct iommu_group
*iommu_group_get_by_id(int id
)
389 struct kobject
*group_kobj
;
390 struct iommu_group
*group
;
393 if (!iommu_group_kset
)
396 name
= kasprintf(GFP_KERNEL
, "%d", id
);
400 group_kobj
= kset_find_obj(iommu_group_kset
, name
);
406 group
= container_of(group_kobj
, struct iommu_group
, kobj
);
407 BUG_ON(group
->id
!= id
);
409 kobject_get(group
->devices_kobj
);
410 kobject_put(&group
->kobj
);
414 EXPORT_SYMBOL_GPL(iommu_group_get_by_id
);
417 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
420 * iommu drivers can store data in the group for use when doing iommu
421 * operations. This function provides a way to retrieve it. Caller
422 * should hold a group reference.
424 void *iommu_group_get_iommudata(struct iommu_group
*group
)
426 return group
->iommu_data
;
428 EXPORT_SYMBOL_GPL(iommu_group_get_iommudata
);
431 * iommu_group_set_iommudata - set iommu_data for a group
433 * @iommu_data: new data
434 * @release: release function for iommu_data
436 * iommu drivers can store data in the group for use when doing iommu
437 * operations. This function provides a way to set the data after
438 * the group has been allocated. Caller should hold a group reference.
440 void iommu_group_set_iommudata(struct iommu_group
*group
, void *iommu_data
,
441 void (*release
)(void *iommu_data
))
443 group
->iommu_data
= iommu_data
;
444 group
->iommu_data_release
= release
;
446 EXPORT_SYMBOL_GPL(iommu_group_set_iommudata
);
449 * iommu_group_set_name - set name for a group
453 * Allow iommu driver to set a name for a group. When set it will
454 * appear in a name attribute file under the group in sysfs.
456 int iommu_group_set_name(struct iommu_group
*group
, const char *name
)
461 iommu_group_remove_file(group
, &iommu_group_attr_name
);
468 group
->name
= kstrdup(name
, GFP_KERNEL
);
472 ret
= iommu_group_create_file(group
, &iommu_group_attr_name
);
481 EXPORT_SYMBOL_GPL(iommu_group_set_name
);
483 static int iommu_group_create_direct_mappings(struct iommu_group
*group
,
486 struct iommu_domain
*domain
= group
->default_domain
;
487 struct iommu_resv_region
*entry
;
488 struct list_head mappings
;
489 unsigned long pg_size
;
492 if (!domain
|| domain
->type
!= IOMMU_DOMAIN_DMA
)
495 BUG_ON(!domain
->pgsize_bitmap
);
497 pg_size
= 1UL << __ffs(domain
->pgsize_bitmap
);
498 INIT_LIST_HEAD(&mappings
);
500 iommu_get_resv_regions(dev
, &mappings
);
502 /* We need to consider overlapping regions for different devices */
503 list_for_each_entry(entry
, &mappings
, list
) {
504 dma_addr_t start
, end
, addr
;
506 if (domain
->ops
->apply_resv_region
)
507 domain
->ops
->apply_resv_region(dev
, domain
, entry
);
509 start
= ALIGN(entry
->start
, pg_size
);
510 end
= ALIGN(entry
->start
+ entry
->length
, pg_size
);
512 if (entry
->type
!= IOMMU_RESV_DIRECT
)
515 for (addr
= start
; addr
< end
; addr
+= pg_size
) {
516 phys_addr_t phys_addr
;
518 phys_addr
= iommu_iova_to_phys(domain
, addr
);
522 ret
= iommu_map(domain
, addr
, addr
, pg_size
, entry
->prot
);
530 iommu_put_resv_regions(dev
, &mappings
);
536 * iommu_group_add_device - add a device to an iommu group
537 * @group: the group into which to add the device (reference should be held)
540 * This function is called by an iommu driver to add a device into a
541 * group. Adding a device increments the group reference count.
543 int iommu_group_add_device(struct iommu_group
*group
, struct device
*dev
)
546 struct group_device
*device
;
548 device
= kzalloc(sizeof(*device
), GFP_KERNEL
);
554 ret
= sysfs_create_link(&dev
->kobj
, &group
->kobj
, "iommu_group");
560 device
->name
= kasprintf(GFP_KERNEL
, "%s", kobject_name(&dev
->kobj
));
563 sysfs_remove_link(&dev
->kobj
, "iommu_group");
568 ret
= sysfs_create_link_nowarn(group
->devices_kobj
,
569 &dev
->kobj
, device
->name
);
572 if (ret
== -EEXIST
&& i
>= 0) {
574 * Account for the slim chance of collision
575 * and append an instance to the name.
577 device
->name
= kasprintf(GFP_KERNEL
, "%s.%d",
578 kobject_name(&dev
->kobj
), i
++);
582 sysfs_remove_link(&dev
->kobj
, "iommu_group");
587 kobject_get(group
->devices_kobj
);
589 dev
->iommu_group
= group
;
591 iommu_group_create_direct_mappings(group
, dev
);
593 mutex_lock(&group
->mutex
);
594 list_add_tail(&device
->list
, &group
->devices
);
596 __iommu_attach_device(group
->domain
, dev
);
597 mutex_unlock(&group
->mutex
);
599 /* Notify any listeners about change to group. */
600 blocking_notifier_call_chain(&group
->notifier
,
601 IOMMU_GROUP_NOTIFY_ADD_DEVICE
, dev
);
603 trace_add_device_to_group(group
->id
, dev
);
605 pr_info("Adding device %s to group %d\n", dev_name(dev
), group
->id
);
609 EXPORT_SYMBOL_GPL(iommu_group_add_device
);
612 * iommu_group_remove_device - remove a device from it's current group
613 * @dev: device to be removed
615 * This function is called by an iommu driver to remove the device from
616 * it's current group. This decrements the iommu group reference count.
618 void iommu_group_remove_device(struct device
*dev
)
620 struct iommu_group
*group
= dev
->iommu_group
;
621 struct group_device
*tmp_device
, *device
= NULL
;
623 pr_info("Removing device %s from group %d\n", dev_name(dev
), group
->id
);
625 /* Pre-notify listeners that a device is being removed. */
626 blocking_notifier_call_chain(&group
->notifier
,
627 IOMMU_GROUP_NOTIFY_DEL_DEVICE
, dev
);
629 mutex_lock(&group
->mutex
);
630 list_for_each_entry(tmp_device
, &group
->devices
, list
) {
631 if (tmp_device
->dev
== dev
) {
633 list_del(&device
->list
);
637 mutex_unlock(&group
->mutex
);
642 sysfs_remove_link(group
->devices_kobj
, device
->name
);
643 sysfs_remove_link(&dev
->kobj
, "iommu_group");
645 trace_remove_device_from_group(group
->id
, dev
);
649 dev
->iommu_group
= NULL
;
650 kobject_put(group
->devices_kobj
);
652 EXPORT_SYMBOL_GPL(iommu_group_remove_device
);
654 static int iommu_group_device_count(struct iommu_group
*group
)
656 struct group_device
*entry
;
659 list_for_each_entry(entry
, &group
->devices
, list
)
666 * iommu_group_for_each_dev - iterate over each device in the group
668 * @data: caller opaque data to be passed to callback function
669 * @fn: caller supplied callback function
671 * This function is called by group users to iterate over group devices.
672 * Callers should hold a reference count to the group during callback.
673 * The group->mutex is held across callbacks, which will block calls to
674 * iommu_group_add/remove_device.
676 static int __iommu_group_for_each_dev(struct iommu_group
*group
, void *data
,
677 int (*fn
)(struct device
*, void *))
679 struct group_device
*device
;
682 list_for_each_entry(device
, &group
->devices
, list
) {
683 ret
= fn(device
->dev
, data
);
691 int iommu_group_for_each_dev(struct iommu_group
*group
, void *data
,
692 int (*fn
)(struct device
*, void *))
696 mutex_lock(&group
->mutex
);
697 ret
= __iommu_group_for_each_dev(group
, data
, fn
);
698 mutex_unlock(&group
->mutex
);
702 EXPORT_SYMBOL_GPL(iommu_group_for_each_dev
);
705 * iommu_group_get - Return the group for a device and increment reference
706 * @dev: get the group that this device belongs to
708 * This function is called by iommu drivers and users to get the group
709 * for the specified device. If found, the group is returned and the group
710 * reference in incremented, else NULL.
712 struct iommu_group
*iommu_group_get(struct device
*dev
)
714 struct iommu_group
*group
= dev
->iommu_group
;
717 kobject_get(group
->devices_kobj
);
721 EXPORT_SYMBOL_GPL(iommu_group_get
);
724 * iommu_group_ref_get - Increment reference on a group
725 * @group: the group to use, must not be NULL
727 * This function is called by iommu drivers to take additional references on an
728 * existing group. Returns the given group for convenience.
730 struct iommu_group
*iommu_group_ref_get(struct iommu_group
*group
)
732 kobject_get(group
->devices_kobj
);
737 * iommu_group_put - Decrement group reference
738 * @group: the group to use
740 * This function is called by iommu drivers and users to release the
741 * iommu group. Once the reference count is zero, the group is released.
743 void iommu_group_put(struct iommu_group
*group
)
746 kobject_put(group
->devices_kobj
);
748 EXPORT_SYMBOL_GPL(iommu_group_put
);
751 * iommu_group_register_notifier - Register a notifier for group changes
752 * @group: the group to watch
753 * @nb: notifier block to signal
755 * This function allows iommu group users to track changes in a group.
756 * See include/linux/iommu.h for actions sent via this notifier. Caller
757 * should hold a reference to the group throughout notifier registration.
759 int iommu_group_register_notifier(struct iommu_group
*group
,
760 struct notifier_block
*nb
)
762 return blocking_notifier_chain_register(&group
->notifier
, nb
);
764 EXPORT_SYMBOL_GPL(iommu_group_register_notifier
);
767 * iommu_group_unregister_notifier - Unregister a notifier
768 * @group: the group to watch
769 * @nb: notifier block to signal
771 * Unregister a previously registered group notifier block.
773 int iommu_group_unregister_notifier(struct iommu_group
*group
,
774 struct notifier_block
*nb
)
776 return blocking_notifier_chain_unregister(&group
->notifier
, nb
);
778 EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier
);
781 * iommu_group_id - Return ID for a group
782 * @group: the group to ID
784 * Return the unique ID for the group matching the sysfs group number.
786 int iommu_group_id(struct iommu_group
*group
)
790 EXPORT_SYMBOL_GPL(iommu_group_id
);
792 static struct iommu_group
*get_pci_alias_group(struct pci_dev
*pdev
,
793 unsigned long *devfns
);
796 * To consider a PCI device isolated, we require ACS to support Source
797 * Validation, Request Redirection, Completer Redirection, and Upstream
798 * Forwarding. This effectively means that devices cannot spoof their
799 * requester ID, requests and completions cannot be redirected, and all
800 * transactions are forwarded upstream, even as it passes through a
801 * bridge where the target device is downstream.
803 #define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
806 * For multifunction devices which are not isolated from each other, find
807 * all the other non-isolated functions and look for existing groups. For
808 * each function, we also need to look for aliases to or from other devices
809 * that may already have a group.
811 static struct iommu_group
*get_pci_function_alias_group(struct pci_dev
*pdev
,
812 unsigned long *devfns
)
814 struct pci_dev
*tmp
= NULL
;
815 struct iommu_group
*group
;
817 if (!pdev
->multifunction
|| pci_acs_enabled(pdev
, REQ_ACS_FLAGS
))
820 for_each_pci_dev(tmp
) {
821 if (tmp
== pdev
|| tmp
->bus
!= pdev
->bus
||
822 PCI_SLOT(tmp
->devfn
) != PCI_SLOT(pdev
->devfn
) ||
823 pci_acs_enabled(tmp
, REQ_ACS_FLAGS
))
826 group
= get_pci_alias_group(tmp
, devfns
);
837 * Look for aliases to or from the given device for existing groups. DMA
838 * aliases are only supported on the same bus, therefore the search
839 * space is quite small (especially since we're really only looking at pcie
840 * device, and therefore only expect multiple slots on the root complex or
841 * downstream switch ports). It's conceivable though that a pair of
842 * multifunction devices could have aliases between them that would cause a
843 * loop. To prevent this, we use a bitmap to track where we've been.
845 static struct iommu_group
*get_pci_alias_group(struct pci_dev
*pdev
,
846 unsigned long *devfns
)
848 struct pci_dev
*tmp
= NULL
;
849 struct iommu_group
*group
;
851 if (test_and_set_bit(pdev
->devfn
& 0xff, devfns
))
854 group
= iommu_group_get(&pdev
->dev
);
858 for_each_pci_dev(tmp
) {
859 if (tmp
== pdev
|| tmp
->bus
!= pdev
->bus
)
862 /* We alias them or they alias us */
863 if (pci_devs_are_dma_aliases(pdev
, tmp
)) {
864 group
= get_pci_alias_group(tmp
, devfns
);
870 group
= get_pci_function_alias_group(tmp
, devfns
);
881 struct group_for_pci_data
{
882 struct pci_dev
*pdev
;
883 struct iommu_group
*group
;
887 * DMA alias iterator callback, return the last seen device. Stop and return
888 * the IOMMU group if we find one along the way.
890 static int get_pci_alias_or_group(struct pci_dev
*pdev
, u16 alias
, void *opaque
)
892 struct group_for_pci_data
*data
= opaque
;
895 data
->group
= iommu_group_get(&pdev
->dev
);
897 return data
->group
!= NULL
;
901 * Generic device_group call-back function. It just allocates one
902 * iommu-group per device.
904 struct iommu_group
*generic_device_group(struct device
*dev
)
906 struct iommu_group
*group
;
908 group
= iommu_group_alloc();
916 * Use standard PCI bus topology, isolation features, and DMA alias quirks
917 * to find or create an IOMMU group for a device.
919 struct iommu_group
*pci_device_group(struct device
*dev
)
921 struct pci_dev
*pdev
= to_pci_dev(dev
);
922 struct group_for_pci_data data
;
924 struct iommu_group
*group
= NULL
;
925 u64 devfns
[4] = { 0 };
927 if (WARN_ON(!dev_is_pci(dev
)))
928 return ERR_PTR(-EINVAL
);
931 * Find the upstream DMA alias for the device. A device must not
932 * be aliased due to topology in order to have its own IOMMU group.
933 * If we find an alias along the way that already belongs to a
936 if (pci_for_each_dma_alias(pdev
, get_pci_alias_or_group
, &data
))
942 * Continue upstream from the point of minimum IOMMU granularity
943 * due to aliases to the point where devices are protected from
944 * peer-to-peer DMA by PCI ACS. Again, if we find an existing
947 for (bus
= pdev
->bus
; !pci_is_root_bus(bus
); bus
= bus
->parent
) {
951 if (pci_acs_path_enabled(bus
->self
, NULL
, REQ_ACS_FLAGS
))
956 group
= iommu_group_get(&pdev
->dev
);
962 * Look for existing groups on device aliases. If we alias another
963 * device or another device aliases us, use the same group.
965 group
= get_pci_alias_group(pdev
, (unsigned long *)devfns
);
970 * Look for existing groups on non-isolated functions on the same
971 * slot and aliases of those funcions, if any. No need to clear
972 * the search bitmap, the tested devfns are still valid.
974 group
= get_pci_function_alias_group(pdev
, (unsigned long *)devfns
);
978 /* No shared group found, allocate new */
979 group
= iommu_group_alloc();
987 * iommu_group_get_for_dev - Find or create the IOMMU group for a device
988 * @dev: target device
990 * This function is intended to be called by IOMMU drivers and extended to
991 * support common, bus-defined algorithms when determining or creating the
992 * IOMMU group for a device. On success, the caller will hold a reference
993 * to the returned IOMMU group, which will already include the provided
994 * device. The reference should be released with iommu_group_put().
996 struct iommu_group
*iommu_group_get_for_dev(struct device
*dev
)
998 const struct iommu_ops
*ops
= dev
->bus
->iommu_ops
;
999 struct iommu_group
*group
;
1002 group
= iommu_group_get(dev
);
1006 group
= ERR_PTR(-EINVAL
);
1008 if (ops
&& ops
->device_group
)
1009 group
= ops
->device_group(dev
);
1015 * Try to allocate a default domain - needs support from the
1018 if (!group
->default_domain
) {
1019 struct iommu_domain
*dom
;
1021 dom
= __iommu_domain_alloc(dev
->bus
, iommu_def_domain_type
);
1022 if (!dom
&& iommu_def_domain_type
!= IOMMU_DOMAIN_DMA
) {
1024 "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
1025 iommu_def_domain_type
);
1026 dom
= __iommu_domain_alloc(dev
->bus
, IOMMU_DOMAIN_DMA
);
1029 group
->default_domain
= dom
;
1031 group
->domain
= dom
;
1034 ret
= iommu_group_add_device(group
, dev
);
1036 iommu_group_put(group
);
1037 return ERR_PTR(ret
);
1043 struct iommu_domain
*iommu_group_default_domain(struct iommu_group
*group
)
1045 return group
->default_domain
;
1048 static int add_iommu_group(struct device
*dev
, void *data
)
1050 struct iommu_callback_data
*cb
= data
;
1051 const struct iommu_ops
*ops
= cb
->ops
;
1054 if (!ops
->add_device
)
1057 WARN_ON(dev
->iommu_group
);
1059 ret
= ops
->add_device(dev
);
1062 * We ignore -ENODEV errors for now, as they just mean that the
1063 * device is not translated by an IOMMU. We still care about
1064 * other errors and fail to initialize when they happen.
1072 static int remove_iommu_group(struct device
*dev
, void *data
)
1074 struct iommu_callback_data
*cb
= data
;
1075 const struct iommu_ops
*ops
= cb
->ops
;
1077 if (ops
->remove_device
&& dev
->iommu_group
)
1078 ops
->remove_device(dev
);
1083 static int iommu_bus_notifier(struct notifier_block
*nb
,
1084 unsigned long action
, void *data
)
1086 struct device
*dev
= data
;
1087 const struct iommu_ops
*ops
= dev
->bus
->iommu_ops
;
1088 struct iommu_group
*group
;
1089 unsigned long group_action
= 0;
1092 * ADD/DEL call into iommu driver ops if provided, which may
1093 * result in ADD/DEL notifiers to group->notifier
1095 if (action
== BUS_NOTIFY_ADD_DEVICE
) {
1096 if (ops
->add_device
)
1097 return ops
->add_device(dev
);
1098 } else if (action
== BUS_NOTIFY_REMOVED_DEVICE
) {
1099 if (ops
->remove_device
&& dev
->iommu_group
) {
1100 ops
->remove_device(dev
);
1106 * Remaining BUS_NOTIFYs get filtered and republished to the
1107 * group, if anyone is listening
1109 group
= iommu_group_get(dev
);
1114 case BUS_NOTIFY_BIND_DRIVER
:
1115 group_action
= IOMMU_GROUP_NOTIFY_BIND_DRIVER
;
1117 case BUS_NOTIFY_BOUND_DRIVER
:
1118 group_action
= IOMMU_GROUP_NOTIFY_BOUND_DRIVER
;
1120 case BUS_NOTIFY_UNBIND_DRIVER
:
1121 group_action
= IOMMU_GROUP_NOTIFY_UNBIND_DRIVER
;
1123 case BUS_NOTIFY_UNBOUND_DRIVER
:
1124 group_action
= IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER
;
1129 blocking_notifier_call_chain(&group
->notifier
,
1132 iommu_group_put(group
);
1136 static int iommu_bus_init(struct bus_type
*bus
, const struct iommu_ops
*ops
)
1139 struct notifier_block
*nb
;
1140 struct iommu_callback_data cb
= {
1144 nb
= kzalloc(sizeof(struct notifier_block
), GFP_KERNEL
);
1148 nb
->notifier_call
= iommu_bus_notifier
;
1150 err
= bus_register_notifier(bus
, nb
);
1154 err
= bus_for_each_dev(bus
, NULL
, &cb
, add_iommu_group
);
1163 bus_for_each_dev(bus
, NULL
, &cb
, remove_iommu_group
);
1164 bus_unregister_notifier(bus
, nb
);
1173 * bus_set_iommu - set iommu-callbacks for the bus
1175 * @ops: the callbacks provided by the iommu-driver
1177 * This function is called by an iommu driver to set the iommu methods
1178 * used for a particular bus. Drivers for devices on that bus can use
1179 * the iommu-api after these ops are registered.
1180 * This special function is needed because IOMMUs are usually devices on
1181 * the bus itself, so the iommu drivers are not initialized when the bus
1182 * is set up. With this function the iommu-driver can set the iommu-ops
1185 int bus_set_iommu(struct bus_type
*bus
, const struct iommu_ops
*ops
)
1189 if (bus
->iommu_ops
!= NULL
)
1192 bus
->iommu_ops
= ops
;
1194 /* Do IOMMU specific setup for this bus-type */
1195 err
= iommu_bus_init(bus
, ops
);
1197 bus
->iommu_ops
= NULL
;
1201 EXPORT_SYMBOL_GPL(bus_set_iommu
);
1203 bool iommu_present(struct bus_type
*bus
)
1205 return bus
->iommu_ops
!= NULL
;
1207 EXPORT_SYMBOL_GPL(iommu_present
);
1209 bool iommu_capable(struct bus_type
*bus
, enum iommu_cap cap
)
1211 if (!bus
->iommu_ops
|| !bus
->iommu_ops
->capable
)
1214 return bus
->iommu_ops
->capable(cap
);
1216 EXPORT_SYMBOL_GPL(iommu_capable
);
1219 * iommu_set_fault_handler() - set a fault handler for an iommu domain
1220 * @domain: iommu domain
1221 * @handler: fault handler
1222 * @token: user data, will be passed back to the fault handler
1224 * This function should be used by IOMMU users which want to be notified
1225 * whenever an IOMMU fault happens.
1227 * The fault handler itself should return 0 on success, and an appropriate
1228 * error code otherwise.
1230 void iommu_set_fault_handler(struct iommu_domain
*domain
,
1231 iommu_fault_handler_t handler
,
1236 domain
->handler
= handler
;
1237 domain
->handler_token
= token
;
1239 EXPORT_SYMBOL_GPL(iommu_set_fault_handler
);
1241 static struct iommu_domain
*__iommu_domain_alloc(struct bus_type
*bus
,
1244 struct iommu_domain
*domain
;
1246 if (bus
== NULL
|| bus
->iommu_ops
== NULL
)
1249 domain
= bus
->iommu_ops
->domain_alloc(type
);
1253 domain
->ops
= bus
->iommu_ops
;
1254 domain
->type
= type
;
1255 /* Assume all sizes by default; the driver may override this later */
1256 domain
->pgsize_bitmap
= bus
->iommu_ops
->pgsize_bitmap
;
1261 struct iommu_domain
*iommu_domain_alloc(struct bus_type
*bus
)
1263 return __iommu_domain_alloc(bus
, IOMMU_DOMAIN_UNMANAGED
);
1265 EXPORT_SYMBOL_GPL(iommu_domain_alloc
);
1267 void iommu_domain_free(struct iommu_domain
*domain
)
1269 domain
->ops
->domain_free(domain
);
1271 EXPORT_SYMBOL_GPL(iommu_domain_free
);
1273 static int __iommu_attach_device(struct iommu_domain
*domain
,
1277 if (unlikely(domain
->ops
->attach_dev
== NULL
))
1280 ret
= domain
->ops
->attach_dev(domain
, dev
);
1282 trace_attach_device_to_domain(dev
);
1286 int iommu_attach_device(struct iommu_domain
*domain
, struct device
*dev
)
1288 struct iommu_group
*group
;
1291 group
= iommu_group_get(dev
);
1292 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1294 return __iommu_attach_device(domain
, dev
);
1297 * We have a group - lock it to make sure the device-count doesn't
1298 * change while we are attaching
1300 mutex_lock(&group
->mutex
);
1302 if (iommu_group_device_count(group
) != 1)
1305 ret
= __iommu_attach_group(domain
, group
);
1308 mutex_unlock(&group
->mutex
);
1309 iommu_group_put(group
);
1313 EXPORT_SYMBOL_GPL(iommu_attach_device
);
1315 static void __iommu_detach_device(struct iommu_domain
*domain
,
1318 if (unlikely(domain
->ops
->detach_dev
== NULL
))
1321 domain
->ops
->detach_dev(domain
, dev
);
1322 trace_detach_device_from_domain(dev
);
1325 void iommu_detach_device(struct iommu_domain
*domain
, struct device
*dev
)
1327 struct iommu_group
*group
;
1329 group
= iommu_group_get(dev
);
1330 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1332 return __iommu_detach_device(domain
, dev
);
1334 mutex_lock(&group
->mutex
);
1335 if (iommu_group_device_count(group
) != 1) {
1340 __iommu_detach_group(domain
, group
);
1343 mutex_unlock(&group
->mutex
);
1344 iommu_group_put(group
);
1346 EXPORT_SYMBOL_GPL(iommu_detach_device
);
1348 struct iommu_domain
*iommu_get_domain_for_dev(struct device
*dev
)
1350 struct iommu_domain
*domain
;
1351 struct iommu_group
*group
;
1353 group
= iommu_group_get(dev
);
1354 /* FIXME: Remove this when groups a mandatory for iommu drivers */
1358 domain
= group
->domain
;
1360 iommu_group_put(group
);
1364 EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev
);
1367 * IOMMU groups are really the natrual working unit of the IOMMU, but
1368 * the IOMMU API works on domains and devices. Bridge that gap by
1369 * iterating over the devices in a group. Ideally we'd have a single
1370 * device which represents the requestor ID of the group, but we also
1371 * allow IOMMU drivers to create policy defined minimum sets, where
1372 * the physical hardware may be able to distiguish members, but we
1373 * wish to group them at a higher level (ex. untrusted multi-function
1374 * PCI devices). Thus we attach each device.
1376 static int iommu_group_do_attach_device(struct device
*dev
, void *data
)
1378 struct iommu_domain
*domain
= data
;
1380 return __iommu_attach_device(domain
, dev
);
1383 static int __iommu_attach_group(struct iommu_domain
*domain
,
1384 struct iommu_group
*group
)
1388 if (group
->default_domain
&& group
->domain
!= group
->default_domain
)
1391 ret
= __iommu_group_for_each_dev(group
, domain
,
1392 iommu_group_do_attach_device
);
1394 group
->domain
= domain
;
1399 int iommu_attach_group(struct iommu_domain
*domain
, struct iommu_group
*group
)
1403 mutex_lock(&group
->mutex
);
1404 ret
= __iommu_attach_group(domain
, group
);
1405 mutex_unlock(&group
->mutex
);
1409 EXPORT_SYMBOL_GPL(iommu_attach_group
);
1411 static int iommu_group_do_detach_device(struct device
*dev
, void *data
)
1413 struct iommu_domain
*domain
= data
;
1415 __iommu_detach_device(domain
, dev
);
1420 static void __iommu_detach_group(struct iommu_domain
*domain
,
1421 struct iommu_group
*group
)
1425 if (!group
->default_domain
) {
1426 __iommu_group_for_each_dev(group
, domain
,
1427 iommu_group_do_detach_device
);
1428 group
->domain
= NULL
;
1432 if (group
->domain
== group
->default_domain
)
1435 /* Detach by re-attaching to the default domain */
1436 ret
= __iommu_group_for_each_dev(group
, group
->default_domain
,
1437 iommu_group_do_attach_device
);
1441 group
->domain
= group
->default_domain
;
1444 void iommu_detach_group(struct iommu_domain
*domain
, struct iommu_group
*group
)
1446 mutex_lock(&group
->mutex
);
1447 __iommu_detach_group(domain
, group
);
1448 mutex_unlock(&group
->mutex
);
1450 EXPORT_SYMBOL_GPL(iommu_detach_group
);
1452 phys_addr_t
iommu_iova_to_phys(struct iommu_domain
*domain
, dma_addr_t iova
)
1454 if (unlikely(domain
->ops
->iova_to_phys
== NULL
))
1457 return domain
->ops
->iova_to_phys(domain
, iova
);
1459 EXPORT_SYMBOL_GPL(iommu_iova_to_phys
);
1461 static size_t iommu_pgsize(struct iommu_domain
*domain
,
1462 unsigned long addr_merge
, size_t size
)
1464 unsigned int pgsize_idx
;
1467 /* Max page size that still fits into 'size' */
1468 pgsize_idx
= __fls(size
);
1470 /* need to consider alignment requirements ? */
1471 if (likely(addr_merge
)) {
1472 /* Max page size allowed by address */
1473 unsigned int align_pgsize_idx
= __ffs(addr_merge
);
1474 pgsize_idx
= min(pgsize_idx
, align_pgsize_idx
);
1477 /* build a mask of acceptable page sizes */
1478 pgsize
= (1UL << (pgsize_idx
+ 1)) - 1;
1480 /* throw away page sizes not supported by the hardware */
1481 pgsize
&= domain
->pgsize_bitmap
;
1483 /* make sure we're still sane */
1486 /* pick the biggest page */
1487 pgsize_idx
= __fls(pgsize
);
1488 pgsize
= 1UL << pgsize_idx
;
1493 int iommu_map(struct iommu_domain
*domain
, unsigned long iova
,
1494 phys_addr_t paddr
, size_t size
, int prot
)
1496 unsigned long orig_iova
= iova
;
1497 unsigned int min_pagesz
;
1498 size_t orig_size
= size
;
1499 phys_addr_t orig_paddr
= paddr
;
1502 if (unlikely(domain
->ops
->map
== NULL
||
1503 domain
->pgsize_bitmap
== 0UL))
1506 if (unlikely(!(domain
->type
& __IOMMU_DOMAIN_PAGING
)))
1509 /* find out the minimum page size supported */
1510 min_pagesz
= 1 << __ffs(domain
->pgsize_bitmap
);
1513 * both the virtual address and the physical one, as well as
1514 * the size of the mapping, must be aligned (at least) to the
1515 * size of the smallest page supported by the hardware
1517 if (!IS_ALIGNED(iova
| paddr
| size
, min_pagesz
)) {
1518 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
1519 iova
, &paddr
, size
, min_pagesz
);
1523 pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova
, &paddr
, size
);
1526 size_t pgsize
= iommu_pgsize(domain
, iova
| paddr
, size
);
1528 pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
1529 iova
, &paddr
, pgsize
);
1531 ret
= domain
->ops
->map(domain
, iova
, paddr
, pgsize
, prot
);
1540 /* unroll mapping in case something went wrong */
1542 iommu_unmap(domain
, orig_iova
, orig_size
- size
);
1544 trace_map(orig_iova
, orig_paddr
, orig_size
);
1548 EXPORT_SYMBOL_GPL(iommu_map
);
1550 size_t iommu_unmap(struct iommu_domain
*domain
, unsigned long iova
, size_t size
)
1552 size_t unmapped_page
, unmapped
= 0;
1553 unsigned int min_pagesz
;
1554 unsigned long orig_iova
= iova
;
1556 if (unlikely(domain
->ops
->unmap
== NULL
||
1557 domain
->pgsize_bitmap
== 0UL))
1560 if (unlikely(!(domain
->type
& __IOMMU_DOMAIN_PAGING
)))
1563 /* find out the minimum page size supported */
1564 min_pagesz
= 1 << __ffs(domain
->pgsize_bitmap
);
1567 * The virtual address, as well as the size of the mapping, must be
1568 * aligned (at least) to the size of the smallest page supported
1571 if (!IS_ALIGNED(iova
| size
, min_pagesz
)) {
1572 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
1573 iova
, size
, min_pagesz
);
1577 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova
, size
);
1580 * Keep iterating until we either unmap 'size' bytes (or more)
1581 * or we hit an area that isn't mapped.
1583 while (unmapped
< size
) {
1584 size_t pgsize
= iommu_pgsize(domain
, iova
, size
- unmapped
);
1586 unmapped_page
= domain
->ops
->unmap(domain
, iova
, pgsize
);
1590 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
1591 iova
, unmapped_page
);
1593 iova
+= unmapped_page
;
1594 unmapped
+= unmapped_page
;
1597 trace_unmap(orig_iova
, size
, unmapped
);
1600 EXPORT_SYMBOL_GPL(iommu_unmap
);
1602 size_t default_iommu_map_sg(struct iommu_domain
*domain
, unsigned long iova
,
1603 struct scatterlist
*sg
, unsigned int nents
, int prot
)
1605 struct scatterlist
*s
;
1607 unsigned int i
, min_pagesz
;
1610 if (unlikely(domain
->pgsize_bitmap
== 0UL))
1613 min_pagesz
= 1 << __ffs(domain
->pgsize_bitmap
);
1615 for_each_sg(sg
, s
, nents
, i
) {
1616 phys_addr_t phys
= page_to_phys(sg_page(s
)) + s
->offset
;
1619 * We are mapping on IOMMU page boundaries, so offset within
1620 * the page must be 0. However, the IOMMU may support pages
1621 * smaller than PAGE_SIZE, so s->offset may still represent
1622 * an offset of that boundary within the CPU page.
1624 if (!IS_ALIGNED(s
->offset
, min_pagesz
))
1627 ret
= iommu_map(domain
, iova
+ mapped
, phys
, s
->length
, prot
);
1631 mapped
+= s
->length
;
1637 /* undo mappings already done */
1638 iommu_unmap(domain
, iova
, mapped
);
1643 EXPORT_SYMBOL_GPL(default_iommu_map_sg
);
1645 int iommu_domain_window_enable(struct iommu_domain
*domain
, u32 wnd_nr
,
1646 phys_addr_t paddr
, u64 size
, int prot
)
1648 if (unlikely(domain
->ops
->domain_window_enable
== NULL
))
1651 return domain
->ops
->domain_window_enable(domain
, wnd_nr
, paddr
, size
,
1654 EXPORT_SYMBOL_GPL(iommu_domain_window_enable
);
1656 void iommu_domain_window_disable(struct iommu_domain
*domain
, u32 wnd_nr
)
1658 if (unlikely(domain
->ops
->domain_window_disable
== NULL
))
1661 return domain
->ops
->domain_window_disable(domain
, wnd_nr
);
1663 EXPORT_SYMBOL_GPL(iommu_domain_window_disable
);
1665 static int __init
iommu_init(void)
1667 iommu_group_kset
= kset_create_and_add("iommu_groups",
1669 BUG_ON(!iommu_group_kset
);
1673 core_initcall(iommu_init
);
1675 int iommu_domain_get_attr(struct iommu_domain
*domain
,
1676 enum iommu_attr attr
, void *data
)
1678 struct iommu_domain_geometry
*geometry
;
1684 case DOMAIN_ATTR_GEOMETRY
:
1686 *geometry
= domain
->geometry
;
1689 case DOMAIN_ATTR_PAGING
:
1691 *paging
= (domain
->pgsize_bitmap
!= 0UL);
1693 case DOMAIN_ATTR_WINDOWS
:
1696 if (domain
->ops
->domain_get_windows
!= NULL
)
1697 *count
= domain
->ops
->domain_get_windows(domain
);
1703 if (!domain
->ops
->domain_get_attr
)
1706 ret
= domain
->ops
->domain_get_attr(domain
, attr
, data
);
1711 EXPORT_SYMBOL_GPL(iommu_domain_get_attr
);
1713 int iommu_domain_set_attr(struct iommu_domain
*domain
,
1714 enum iommu_attr attr
, void *data
)
1720 case DOMAIN_ATTR_WINDOWS
:
1723 if (domain
->ops
->domain_set_windows
!= NULL
)
1724 ret
= domain
->ops
->domain_set_windows(domain
, *count
);
1730 if (domain
->ops
->domain_set_attr
== NULL
)
1733 ret
= domain
->ops
->domain_set_attr(domain
, attr
, data
);
1738 EXPORT_SYMBOL_GPL(iommu_domain_set_attr
);
1740 void iommu_get_resv_regions(struct device
*dev
, struct list_head
*list
)
1742 const struct iommu_ops
*ops
= dev
->bus
->iommu_ops
;
1744 if (ops
&& ops
->get_resv_regions
)
1745 ops
->get_resv_regions(dev
, list
);
1748 void iommu_put_resv_regions(struct device
*dev
, struct list_head
*list
)
1750 const struct iommu_ops
*ops
= dev
->bus
->iommu_ops
;
1752 if (ops
&& ops
->put_resv_regions
)
1753 ops
->put_resv_regions(dev
, list
);
1756 struct iommu_resv_region
*iommu_alloc_resv_region(phys_addr_t start
,
1760 struct iommu_resv_region
*region
;
1762 region
= kzalloc(sizeof(*region
), GFP_KERNEL
);
1766 INIT_LIST_HEAD(®ion
->list
);
1767 region
->start
= start
;
1768 region
->length
= length
;
1769 region
->prot
= prot
;
1770 region
->type
= type
;
1774 /* Request that a device is direct mapped by the IOMMU */
1775 int iommu_request_dm_for_dev(struct device
*dev
)
1777 struct iommu_domain
*dm_domain
;
1778 struct iommu_group
*group
;
1781 /* Device must already be in a group before calling this function */
1782 group
= iommu_group_get_for_dev(dev
);
1784 return PTR_ERR(group
);
1786 mutex_lock(&group
->mutex
);
1788 /* Check if the default domain is already direct mapped */
1790 if (group
->default_domain
&&
1791 group
->default_domain
->type
== IOMMU_DOMAIN_IDENTITY
)
1794 /* Don't change mappings of existing devices */
1796 if (iommu_group_device_count(group
) != 1)
1799 /* Allocate a direct mapped domain */
1801 dm_domain
= __iommu_domain_alloc(dev
->bus
, IOMMU_DOMAIN_IDENTITY
);
1805 /* Attach the device to the domain */
1806 ret
= __iommu_attach_group(dm_domain
, group
);
1808 iommu_domain_free(dm_domain
);
1812 /* Make the direct mapped domain the default for this group */
1813 if (group
->default_domain
)
1814 iommu_domain_free(group
->default_domain
);
1815 group
->default_domain
= dm_domain
;
1817 pr_info("Using direct mapping for device %s\n", dev_name(dev
));
1821 mutex_unlock(&group
->mutex
);
1822 iommu_group_put(group
);
1827 struct iommu_instance
{
1828 struct list_head list
;
1829 struct fwnode_handle
*fwnode
;
1830 const struct iommu_ops
*ops
;
1832 static LIST_HEAD(iommu_instance_list
);
1833 static DEFINE_SPINLOCK(iommu_instance_lock
);
1835 void iommu_register_instance(struct fwnode_handle
*fwnode
,
1836 const struct iommu_ops
*ops
)
1838 struct iommu_instance
*iommu
= kzalloc(sizeof(*iommu
), GFP_KERNEL
);
1840 if (WARN_ON(!iommu
))
1843 of_node_get(to_of_node(fwnode
));
1844 INIT_LIST_HEAD(&iommu
->list
);
1845 iommu
->fwnode
= fwnode
;
1847 spin_lock(&iommu_instance_lock
);
1848 list_add_tail(&iommu
->list
, &iommu_instance_list
);
1849 spin_unlock(&iommu_instance_lock
);
1852 const struct iommu_ops
*iommu_ops_from_fwnode(struct fwnode_handle
*fwnode
)
1854 struct iommu_instance
*instance
;
1855 const struct iommu_ops
*ops
= NULL
;
1857 spin_lock(&iommu_instance_lock
);
1858 list_for_each_entry(instance
, &iommu_instance_list
, list
)
1859 if (instance
->fwnode
== fwnode
) {
1860 ops
= instance
->ops
;
1863 spin_unlock(&iommu_instance_lock
);
1867 int iommu_fwspec_init(struct device
*dev
, struct fwnode_handle
*iommu_fwnode
,
1868 const struct iommu_ops
*ops
)
1870 struct iommu_fwspec
*fwspec
= dev
->iommu_fwspec
;
1873 return ops
== fwspec
->ops
? 0 : -EINVAL
;
1875 fwspec
= kzalloc(sizeof(*fwspec
), GFP_KERNEL
);
1879 of_node_get(to_of_node(iommu_fwnode
));
1880 fwspec
->iommu_fwnode
= iommu_fwnode
;
1882 dev
->iommu_fwspec
= fwspec
;
1885 EXPORT_SYMBOL_GPL(iommu_fwspec_init
);
1887 void iommu_fwspec_free(struct device
*dev
)
1889 struct iommu_fwspec
*fwspec
= dev
->iommu_fwspec
;
1892 fwnode_handle_put(fwspec
->iommu_fwnode
);
1894 dev
->iommu_fwspec
= NULL
;
1897 EXPORT_SYMBOL_GPL(iommu_fwspec_free
);
1899 int iommu_fwspec_add_ids(struct device
*dev
, u32
*ids
, int num_ids
)
1901 struct iommu_fwspec
*fwspec
= dev
->iommu_fwspec
;
1908 size
= offsetof(struct iommu_fwspec
, ids
[fwspec
->num_ids
+ num_ids
]);
1909 if (size
> sizeof(*fwspec
)) {
1910 fwspec
= krealloc(dev
->iommu_fwspec
, size
, GFP_KERNEL
);
1915 for (i
= 0; i
< num_ids
; i
++)
1916 fwspec
->ids
[fwspec
->num_ids
+ i
] = ids
[i
];
1918 fwspec
->num_ids
+= num_ids
;
1919 dev
->iommu_fwspec
= fwspec
;
1922 EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids
);