blob: d4f527e5667936454bfb49e01db931703b180e73 [file] [log] [blame]
Joerg Roedelfc2100e2008-11-26 17:21:24 +01001/*
2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
Joerg Roedel63ce3ae2015-02-04 16:12:55 +01003 * Author: Joerg Roedel <jroedel@suse.de>
Joerg Roedelfc2100e2008-11-26 17:21:24 +01004 *
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.
8 *
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.
13 *
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
17 */
18
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +020019#define pr_fmt(fmt) "%s: " fmt, __func__
20
Joerg Roedel905d66c2011-09-06 16:03:26 +020021#include <linux/device.h>
Ohad Ben-Cohen40998182011-09-02 13:32:32 -040022#include <linux/kernel.h>
Joerg Roedelfc2100e2008-11-26 17:21:24 +010023#include <linux/bug.h>
24#include <linux/types.h>
Andrew Morton60db4022009-05-06 16:03:07 -070025#include <linux/module.h>
26#include <linux/slab.h>
Joerg Roedelfc2100e2008-11-26 17:21:24 +010027#include <linux/errno.h>
28#include <linux/iommu.h>
Alex Williamsond72e31c2012-05-30 14:18:53 -060029#include <linux/idr.h>
30#include <linux/notifier.h>
31#include <linux/err.h>
Alex Williamson104a1c12014-07-03 09:51:18 -060032#include <linux/pci.h>
Alex Williamsonf096c062014-09-19 10:03:06 -060033#include <linux/bitops.h>
Shuah Khan7f6db172013-08-15 11:59:23 -060034#include <trace/events/iommu.h>
Joerg Roedelfc2100e2008-11-26 17:21:24 +010035
Alex Williamsond72e31c2012-05-30 14:18:53 -060036static struct kset *iommu_group_kset;
37static struct ida iommu_group_ida;
38static struct mutex iommu_group_mutex;
39
Thierry Redingb22f6432014-06-27 09:03:12 +020040struct iommu_callback_data {
41 const struct iommu_ops *ops;
42};
43
Alex Williamsond72e31c2012-05-30 14:18:53 -060044struct iommu_group {
45 struct kobject kobj;
46 struct kobject *devices_kobj;
47 struct list_head devices;
48 struct mutex mutex;
49 struct blocking_notifier_head notifier;
50 void *iommu_data;
51 void (*iommu_data_release)(void *iommu_data);
52 char *name;
53 int id;
54};
55
56struct iommu_device {
57 struct list_head list;
58 struct device *dev;
59 char *name;
60};
61
62struct iommu_group_attribute {
63 struct attribute attr;
64 ssize_t (*show)(struct iommu_group *group, char *buf);
65 ssize_t (*store)(struct iommu_group *group,
66 const char *buf, size_t count);
67};
68
69#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
70struct iommu_group_attribute iommu_group_attr_##_name = \
71 __ATTR(_name, _mode, _show, _store)
72
73#define to_iommu_group_attr(_attr) \
74 container_of(_attr, struct iommu_group_attribute, attr)
75#define to_iommu_group(_kobj) \
76 container_of(_kobj, struct iommu_group, kobj)
77
78static ssize_t iommu_group_attr_show(struct kobject *kobj,
79 struct attribute *__attr, char *buf)
Alex Williamson14604322011-10-21 15:56:05 -040080{
Alex Williamsond72e31c2012-05-30 14:18:53 -060081 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
82 struct iommu_group *group = to_iommu_group(kobj);
83 ssize_t ret = -EIO;
Alex Williamson14604322011-10-21 15:56:05 -040084
Alex Williamsond72e31c2012-05-30 14:18:53 -060085 if (attr->show)
86 ret = attr->show(group, buf);
87 return ret;
Alex Williamson14604322011-10-21 15:56:05 -040088}
Alex Williamsond72e31c2012-05-30 14:18:53 -060089
90static ssize_t iommu_group_attr_store(struct kobject *kobj,
91 struct attribute *__attr,
92 const char *buf, size_t count)
93{
94 struct iommu_group_attribute *attr = to_iommu_group_attr(__attr);
95 struct iommu_group *group = to_iommu_group(kobj);
96 ssize_t ret = -EIO;
97
98 if (attr->store)
99 ret = attr->store(group, buf, count);
100 return ret;
101}
102
103static const struct sysfs_ops iommu_group_sysfs_ops = {
104 .show = iommu_group_attr_show,
105 .store = iommu_group_attr_store,
106};
107
108static int iommu_group_create_file(struct iommu_group *group,
109 struct iommu_group_attribute *attr)
110{
111 return sysfs_create_file(&group->kobj, &attr->attr);
112}
113
114static void iommu_group_remove_file(struct iommu_group *group,
115 struct iommu_group_attribute *attr)
116{
117 sysfs_remove_file(&group->kobj, &attr->attr);
118}
119
120static ssize_t iommu_group_show_name(struct iommu_group *group, char *buf)
121{
122 return sprintf(buf, "%s\n", group->name);
123}
124
125static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
126
127static void iommu_group_release(struct kobject *kobj)
128{
129 struct iommu_group *group = to_iommu_group(kobj);
130
131 if (group->iommu_data_release)
132 group->iommu_data_release(group->iommu_data);
133
134 mutex_lock(&iommu_group_mutex);
135 ida_remove(&iommu_group_ida, group->id);
136 mutex_unlock(&iommu_group_mutex);
137
138 kfree(group->name);
139 kfree(group);
140}
141
142static struct kobj_type iommu_group_ktype = {
143 .sysfs_ops = &iommu_group_sysfs_ops,
144 .release = iommu_group_release,
145};
146
147/**
148 * iommu_group_alloc - Allocate a new group
149 * @name: Optional name to associate with group, visible in sysfs
150 *
151 * This function is called by an iommu driver to allocate a new iommu
152 * group. The iommu group represents the minimum granularity of the iommu.
153 * Upon successful return, the caller holds a reference to the supplied
154 * group in order to hold the group until devices are added. Use
155 * iommu_group_put() to release this extra reference count, allowing the
156 * group to be automatically reclaimed once it has no devices or external
157 * references.
158 */
159struct iommu_group *iommu_group_alloc(void)
160{
161 struct iommu_group *group;
162 int ret;
163
164 group = kzalloc(sizeof(*group), GFP_KERNEL);
165 if (!group)
166 return ERR_PTR(-ENOMEM);
167
168 group->kobj.kset = iommu_group_kset;
169 mutex_init(&group->mutex);
170 INIT_LIST_HEAD(&group->devices);
171 BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
172
173 mutex_lock(&iommu_group_mutex);
174
175again:
176 if (unlikely(0 == ida_pre_get(&iommu_group_ida, GFP_KERNEL))) {
177 kfree(group);
178 mutex_unlock(&iommu_group_mutex);
179 return ERR_PTR(-ENOMEM);
180 }
181
182 if (-EAGAIN == ida_get_new(&iommu_group_ida, &group->id))
183 goto again;
184
185 mutex_unlock(&iommu_group_mutex);
186
187 ret = kobject_init_and_add(&group->kobj, &iommu_group_ktype,
188 NULL, "%d", group->id);
189 if (ret) {
190 mutex_lock(&iommu_group_mutex);
191 ida_remove(&iommu_group_ida, group->id);
192 mutex_unlock(&iommu_group_mutex);
193 kfree(group);
194 return ERR_PTR(ret);
195 }
196
197 group->devices_kobj = kobject_create_and_add("devices", &group->kobj);
198 if (!group->devices_kobj) {
199 kobject_put(&group->kobj); /* triggers .release & free */
200 return ERR_PTR(-ENOMEM);
201 }
202
203 /*
204 * The devices_kobj holds a reference on the group kobject, so
205 * as long as that exists so will the group. We can therefore
206 * use the devices_kobj for reference counting.
207 */
208 kobject_put(&group->kobj);
209
210 return group;
211}
212EXPORT_SYMBOL_GPL(iommu_group_alloc);
213
Alexey Kardashevskiyaa16bea2013-03-25 10:23:49 +1100214struct iommu_group *iommu_group_get_by_id(int id)
215{
216 struct kobject *group_kobj;
217 struct iommu_group *group;
218 const char *name;
219
220 if (!iommu_group_kset)
221 return NULL;
222
223 name = kasprintf(GFP_KERNEL, "%d", id);
224 if (!name)
225 return NULL;
226
227 group_kobj = kset_find_obj(iommu_group_kset, name);
228 kfree(name);
229
230 if (!group_kobj)
231 return NULL;
232
233 group = container_of(group_kobj, struct iommu_group, kobj);
234 BUG_ON(group->id != id);
235
236 kobject_get(group->devices_kobj);
237 kobject_put(&group->kobj);
238
239 return group;
240}
241EXPORT_SYMBOL_GPL(iommu_group_get_by_id);
242
Alex Williamsond72e31c2012-05-30 14:18:53 -0600243/**
244 * iommu_group_get_iommudata - retrieve iommu_data registered for a group
245 * @group: the group
246 *
247 * iommu drivers can store data in the group for use when doing iommu
248 * operations. This function provides a way to retrieve it. Caller
249 * should hold a group reference.
250 */
251void *iommu_group_get_iommudata(struct iommu_group *group)
252{
253 return group->iommu_data;
254}
255EXPORT_SYMBOL_GPL(iommu_group_get_iommudata);
256
257/**
258 * iommu_group_set_iommudata - set iommu_data for a group
259 * @group: the group
260 * @iommu_data: new data
261 * @release: release function for iommu_data
262 *
263 * iommu drivers can store data in the group for use when doing iommu
264 * operations. This function provides a way to set the data after
265 * the group has been allocated. Caller should hold a group reference.
266 */
267void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
268 void (*release)(void *iommu_data))
269{
270 group->iommu_data = iommu_data;
271 group->iommu_data_release = release;
272}
273EXPORT_SYMBOL_GPL(iommu_group_set_iommudata);
274
275/**
276 * iommu_group_set_name - set name for a group
277 * @group: the group
278 * @name: name
279 *
280 * Allow iommu driver to set a name for a group. When set it will
281 * appear in a name attribute file under the group in sysfs.
282 */
283int iommu_group_set_name(struct iommu_group *group, const char *name)
284{
285 int ret;
286
287 if (group->name) {
288 iommu_group_remove_file(group, &iommu_group_attr_name);
289 kfree(group->name);
290 group->name = NULL;
291 if (!name)
292 return 0;
293 }
294
295 group->name = kstrdup(name, GFP_KERNEL);
296 if (!group->name)
297 return -ENOMEM;
298
299 ret = iommu_group_create_file(group, &iommu_group_attr_name);
300 if (ret) {
301 kfree(group->name);
302 group->name = NULL;
303 return ret;
304 }
305
306 return 0;
307}
308EXPORT_SYMBOL_GPL(iommu_group_set_name);
309
310/**
311 * iommu_group_add_device - add a device to an iommu group
312 * @group: the group into which to add the device (reference should be held)
313 * @dev: the device
314 *
315 * This function is called by an iommu driver to add a device into a
316 * group. Adding a device increments the group reference count.
317 */
318int iommu_group_add_device(struct iommu_group *group, struct device *dev)
319{
320 int ret, i = 0;
321 struct iommu_device *device;
322
323 device = kzalloc(sizeof(*device), GFP_KERNEL);
324 if (!device)
325 return -ENOMEM;
326
327 device->dev = dev;
328
329 ret = sysfs_create_link(&dev->kobj, &group->kobj, "iommu_group");
330 if (ret) {
331 kfree(device);
332 return ret;
333 }
334
335 device->name = kasprintf(GFP_KERNEL, "%s", kobject_name(&dev->kobj));
336rename:
337 if (!device->name) {
338 sysfs_remove_link(&dev->kobj, "iommu_group");
339 kfree(device);
340 return -ENOMEM;
341 }
342
343 ret = sysfs_create_link_nowarn(group->devices_kobj,
344 &dev->kobj, device->name);
345 if (ret) {
346 kfree(device->name);
347 if (ret == -EEXIST && i >= 0) {
348 /*
349 * Account for the slim chance of collision
350 * and append an instance to the name.
351 */
352 device->name = kasprintf(GFP_KERNEL, "%s.%d",
353 kobject_name(&dev->kobj), i++);
354 goto rename;
355 }
356
357 sysfs_remove_link(&dev->kobj, "iommu_group");
358 kfree(device);
359 return ret;
360 }
361
362 kobject_get(group->devices_kobj);
363
364 dev->iommu_group = group;
365
366 mutex_lock(&group->mutex);
367 list_add_tail(&device->list, &group->devices);
368 mutex_unlock(&group->mutex);
369
370 /* Notify any listeners about change to group. */
371 blocking_notifier_call_chain(&group->notifier,
372 IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
Shuah Khand1cf7e82013-08-15 11:59:24 -0600373
374 trace_add_device_to_group(group->id, dev);
Alex Williamsond72e31c2012-05-30 14:18:53 -0600375 return 0;
376}
377EXPORT_SYMBOL_GPL(iommu_group_add_device);
378
379/**
380 * iommu_group_remove_device - remove a device from it's current group
381 * @dev: device to be removed
382 *
383 * This function is called by an iommu driver to remove the device from
384 * it's current group. This decrements the iommu group reference count.
385 */
386void iommu_group_remove_device(struct device *dev)
387{
388 struct iommu_group *group = dev->iommu_group;
389 struct iommu_device *tmp_device, *device = NULL;
390
391 /* Pre-notify listeners that a device is being removed. */
392 blocking_notifier_call_chain(&group->notifier,
393 IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
394
395 mutex_lock(&group->mutex);
396 list_for_each_entry(tmp_device, &group->devices, list) {
397 if (tmp_device->dev == dev) {
398 device = tmp_device;
399 list_del(&device->list);
400 break;
401 }
402 }
403 mutex_unlock(&group->mutex);
404
405 if (!device)
406 return;
407
408 sysfs_remove_link(group->devices_kobj, device->name);
409 sysfs_remove_link(&dev->kobj, "iommu_group");
410
Shuah Khan2e757082013-08-15 11:59:25 -0600411 trace_remove_device_from_group(group->id, dev);
412
Alex Williamsond72e31c2012-05-30 14:18:53 -0600413 kfree(device->name);
414 kfree(device);
415 dev->iommu_group = NULL;
416 kobject_put(group->devices_kobj);
417}
418EXPORT_SYMBOL_GPL(iommu_group_remove_device);
419
420/**
421 * iommu_group_for_each_dev - iterate over each device in the group
422 * @group: the group
423 * @data: caller opaque data to be passed to callback function
424 * @fn: caller supplied callback function
425 *
426 * This function is called by group users to iterate over group devices.
427 * Callers should hold a reference count to the group during callback.
428 * The group->mutex is held across callbacks, which will block calls to
429 * iommu_group_add/remove_device.
430 */
431int iommu_group_for_each_dev(struct iommu_group *group, void *data,
432 int (*fn)(struct device *, void *))
433{
434 struct iommu_device *device;
435 int ret = 0;
436
437 mutex_lock(&group->mutex);
438 list_for_each_entry(device, &group->devices, list) {
439 ret = fn(device->dev, data);
440 if (ret)
441 break;
442 }
443 mutex_unlock(&group->mutex);
444 return ret;
445}
446EXPORT_SYMBOL_GPL(iommu_group_for_each_dev);
447
448/**
449 * iommu_group_get - Return the group for a device and increment reference
450 * @dev: get the group that this device belongs to
451 *
452 * This function is called by iommu drivers and users to get the group
453 * for the specified device. If found, the group is returned and the group
454 * reference in incremented, else NULL.
455 */
456struct iommu_group *iommu_group_get(struct device *dev)
457{
458 struct iommu_group *group = dev->iommu_group;
459
460 if (group)
461 kobject_get(group->devices_kobj);
462
463 return group;
464}
465EXPORT_SYMBOL_GPL(iommu_group_get);
466
467/**
468 * iommu_group_put - Decrement group reference
469 * @group: the group to use
470 *
471 * This function is called by iommu drivers and users to release the
472 * iommu group. Once the reference count is zero, the group is released.
473 */
474void iommu_group_put(struct iommu_group *group)
475{
476 if (group)
477 kobject_put(group->devices_kobj);
478}
479EXPORT_SYMBOL_GPL(iommu_group_put);
480
481/**
482 * iommu_group_register_notifier - Register a notifier for group changes
483 * @group: the group to watch
484 * @nb: notifier block to signal
485 *
486 * This function allows iommu group users to track changes in a group.
487 * See include/linux/iommu.h for actions sent via this notifier. Caller
488 * should hold a reference to the group throughout notifier registration.
489 */
490int iommu_group_register_notifier(struct iommu_group *group,
491 struct notifier_block *nb)
492{
493 return blocking_notifier_chain_register(&group->notifier, nb);
494}
495EXPORT_SYMBOL_GPL(iommu_group_register_notifier);
496
497/**
498 * iommu_group_unregister_notifier - Unregister a notifier
499 * @group: the group to watch
500 * @nb: notifier block to signal
501 *
502 * Unregister a previously registered group notifier block.
503 */
504int iommu_group_unregister_notifier(struct iommu_group *group,
505 struct notifier_block *nb)
506{
507 return blocking_notifier_chain_unregister(&group->notifier, nb);
508}
509EXPORT_SYMBOL_GPL(iommu_group_unregister_notifier);
510
511/**
512 * iommu_group_id - Return ID for a group
513 * @group: the group to ID
514 *
515 * Return the unique ID for the group matching the sysfs group number.
516 */
517int iommu_group_id(struct iommu_group *group)
518{
519 return group->id;
520}
521EXPORT_SYMBOL_GPL(iommu_group_id);
Alex Williamson14604322011-10-21 15:56:05 -0400522
Alex Williamsonf096c062014-09-19 10:03:06 -0600523static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
524 unsigned long *devfns);
525
Alex Williamson104a1c12014-07-03 09:51:18 -0600526/*
527 * To consider a PCI device isolated, we require ACS to support Source
528 * Validation, Request Redirection, Completer Redirection, and Upstream
529 * Forwarding. This effectively means that devices cannot spoof their
530 * requester ID, requests and completions cannot be redirected, and all
531 * transactions are forwarded upstream, even as it passes through a
532 * bridge where the target device is downstream.
533 */
534#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
535
Alex Williamsonf096c062014-09-19 10:03:06 -0600536/*
537 * For multifunction devices which are not isolated from each other, find
538 * all the other non-isolated functions and look for existing groups. For
539 * each function, we also need to look for aliases to or from other devices
540 * that may already have a group.
541 */
542static struct iommu_group *get_pci_function_alias_group(struct pci_dev *pdev,
543 unsigned long *devfns)
544{
545 struct pci_dev *tmp = NULL;
546 struct iommu_group *group;
547
548 if (!pdev->multifunction || pci_acs_enabled(pdev, REQ_ACS_FLAGS))
549 return NULL;
550
551 for_each_pci_dev(tmp) {
552 if (tmp == pdev || tmp->bus != pdev->bus ||
553 PCI_SLOT(tmp->devfn) != PCI_SLOT(pdev->devfn) ||
554 pci_acs_enabled(tmp, REQ_ACS_FLAGS))
555 continue;
556
557 group = get_pci_alias_group(tmp, devfns);
558 if (group) {
559 pci_dev_put(tmp);
560 return group;
561 }
562 }
563
564 return NULL;
565}
566
567/*
568 * Look for aliases to or from the given device for exisiting groups. The
569 * dma_alias_devfn only supports aliases on the same bus, therefore the search
570 * space is quite small (especially since we're really only looking at pcie
571 * device, and therefore only expect multiple slots on the root complex or
572 * downstream switch ports). It's conceivable though that a pair of
573 * multifunction devices could have aliases between them that would cause a
574 * loop. To prevent this, we use a bitmap to track where we've been.
575 */
576static struct iommu_group *get_pci_alias_group(struct pci_dev *pdev,
577 unsigned long *devfns)
578{
579 struct pci_dev *tmp = NULL;
580 struct iommu_group *group;
581
582 if (test_and_set_bit(pdev->devfn & 0xff, devfns))
583 return NULL;
584
585 group = iommu_group_get(&pdev->dev);
586 if (group)
587 return group;
588
589 for_each_pci_dev(tmp) {
590 if (tmp == pdev || tmp->bus != pdev->bus)
591 continue;
592
593 /* We alias them or they alias us */
594 if (((pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
595 pdev->dma_alias_devfn == tmp->devfn) ||
596 ((tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) &&
597 tmp->dma_alias_devfn == pdev->devfn)) {
598
599 group = get_pci_alias_group(tmp, devfns);
600 if (group) {
601 pci_dev_put(tmp);
602 return group;
603 }
604
605 group = get_pci_function_alias_group(tmp, devfns);
606 if (group) {
607 pci_dev_put(tmp);
608 return group;
609 }
610 }
611 }
612
613 return NULL;
614}
615
Alex Williamson104a1c12014-07-03 09:51:18 -0600616struct group_for_pci_data {
617 struct pci_dev *pdev;
618 struct iommu_group *group;
619};
620
621/*
622 * DMA alias iterator callback, return the last seen device. Stop and return
623 * the IOMMU group if we find one along the way.
624 */
625static int get_pci_alias_or_group(struct pci_dev *pdev, u16 alias, void *opaque)
626{
627 struct group_for_pci_data *data = opaque;
628
629 data->pdev = pdev;
630 data->group = iommu_group_get(&pdev->dev);
631
632 return data->group != NULL;
633}
634
635/*
636 * Use standard PCI bus topology, isolation features, and DMA alias quirks
637 * to find or create an IOMMU group for a device.
638 */
639static struct iommu_group *iommu_group_get_for_pci_dev(struct pci_dev *pdev)
640{
641 struct group_for_pci_data data;
642 struct pci_bus *bus;
643 struct iommu_group *group = NULL;
Alex Williamsonf096c062014-09-19 10:03:06 -0600644 u64 devfns[4] = { 0 };
Alex Williamson104a1c12014-07-03 09:51:18 -0600645
646 /*
647 * Find the upstream DMA alias for the device. A device must not
648 * be aliased due to topology in order to have its own IOMMU group.
649 * If we find an alias along the way that already belongs to a
650 * group, use it.
651 */
652 if (pci_for_each_dma_alias(pdev, get_pci_alias_or_group, &data))
653 return data.group;
654
655 pdev = data.pdev;
656
657 /*
658 * Continue upstream from the point of minimum IOMMU granularity
659 * due to aliases to the point where devices are protected from
660 * peer-to-peer DMA by PCI ACS. Again, if we find an existing
661 * group, use it.
662 */
663 for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) {
664 if (!bus->self)
665 continue;
666
667 if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
668 break;
669
670 pdev = bus->self;
671
672 group = iommu_group_get(&pdev->dev);
673 if (group)
674 return group;
675 }
676
677 /*
Alex Williamsonf096c062014-09-19 10:03:06 -0600678 * Look for existing groups on device aliases. If we alias another
679 * device or another device aliases us, use the same group.
Alex Williamson104a1c12014-07-03 09:51:18 -0600680 */
Alex Williamsonf096c062014-09-19 10:03:06 -0600681 group = get_pci_alias_group(pdev, (unsigned long *)devfns);
682 if (group)
683 return group;
Alex Williamson104a1c12014-07-03 09:51:18 -0600684
685 /*
Alex Williamsonf096c062014-09-19 10:03:06 -0600686 * Look for existing groups on non-isolated functions on the same
687 * slot and aliases of those funcions, if any. No need to clear
688 * the search bitmap, the tested devfns are still valid.
Alex Williamson104a1c12014-07-03 09:51:18 -0600689 */
Alex Williamsonf096c062014-09-19 10:03:06 -0600690 group = get_pci_function_alias_group(pdev, (unsigned long *)devfns);
691 if (group)
692 return group;
Alex Williamson104a1c12014-07-03 09:51:18 -0600693
694 /* No shared group found, allocate new */
695 return iommu_group_alloc();
696}
697
698/**
699 * iommu_group_get_for_dev - Find or create the IOMMU group for a device
700 * @dev: target device
701 *
702 * This function is intended to be called by IOMMU drivers and extended to
703 * support common, bus-defined algorithms when determining or creating the
704 * IOMMU group for a device. On success, the caller will hold a reference
705 * to the returned IOMMU group, which will already include the provided
706 * device. The reference should be released with iommu_group_put().
707 */
708struct iommu_group *iommu_group_get_for_dev(struct device *dev)
709{
Joerg Roedelc4a783b2014-08-21 22:32:08 +0200710 struct iommu_group *group;
Alex Williamson104a1c12014-07-03 09:51:18 -0600711 int ret;
712
713 group = iommu_group_get(dev);
714 if (group)
715 return group;
716
Joerg Roedelc4a783b2014-08-21 22:32:08 +0200717 if (!dev_is_pci(dev))
718 return ERR_PTR(-EINVAL);
719
720 group = iommu_group_get_for_pci_dev(to_pci_dev(dev));
Alex Williamson104a1c12014-07-03 09:51:18 -0600721
722 if (IS_ERR(group))
723 return group;
724
725 ret = iommu_group_add_device(group, dev);
726 if (ret) {
727 iommu_group_put(group);
728 return ERR_PTR(ret);
729 }
730
731 return group;
732}
733
Alex Williamson14604322011-10-21 15:56:05 -0400734static int add_iommu_group(struct device *dev, void *data)
735{
Thierry Redingb22f6432014-06-27 09:03:12 +0200736 struct iommu_callback_data *cb = data;
737 const struct iommu_ops *ops = cb->ops;
Alex Williamson14604322011-10-21 15:56:05 -0400738
Alex Williamsond72e31c2012-05-30 14:18:53 -0600739 if (!ops->add_device)
Marek Szyprowski461bfb3f2014-11-19 11:15:31 +0000740 return 0;
Alex Williamsond72e31c2012-05-30 14:18:53 -0600741
742 WARN_ON(dev->iommu_group);
743
744 ops->add_device(dev);
Alex Williamson14604322011-10-21 15:56:05 -0400745
746 return 0;
747}
748
Alex Williamsond72e31c2012-05-30 14:18:53 -0600749static int iommu_bus_notifier(struct notifier_block *nb,
750 unsigned long action, void *data)
Alex Williamson14604322011-10-21 15:56:05 -0400751{
752 struct device *dev = data;
Thierry Redingb22f6432014-06-27 09:03:12 +0200753 const struct iommu_ops *ops = dev->bus->iommu_ops;
Alex Williamsond72e31c2012-05-30 14:18:53 -0600754 struct iommu_group *group;
755 unsigned long group_action = 0;
Alex Williamson14604322011-10-21 15:56:05 -0400756
Alex Williamsond72e31c2012-05-30 14:18:53 -0600757 /*
758 * ADD/DEL call into iommu driver ops if provided, which may
759 * result in ADD/DEL notifiers to group->notifier
760 */
761 if (action == BUS_NOTIFY_ADD_DEVICE) {
762 if (ops->add_device)
763 return ops->add_device(dev);
764 } else if (action == BUS_NOTIFY_DEL_DEVICE) {
765 if (ops->remove_device && dev->iommu_group) {
766 ops->remove_device(dev);
767 return 0;
768 }
769 }
Alex Williamson14604322011-10-21 15:56:05 -0400770
Alex Williamsond72e31c2012-05-30 14:18:53 -0600771 /*
772 * Remaining BUS_NOTIFYs get filtered and republished to the
773 * group, if anyone is listening
774 */
775 group = iommu_group_get(dev);
776 if (!group)
777 return 0;
778
779 switch (action) {
780 case BUS_NOTIFY_BIND_DRIVER:
781 group_action = IOMMU_GROUP_NOTIFY_BIND_DRIVER;
782 break;
783 case BUS_NOTIFY_BOUND_DRIVER:
784 group_action = IOMMU_GROUP_NOTIFY_BOUND_DRIVER;
785 break;
786 case BUS_NOTIFY_UNBIND_DRIVER:
787 group_action = IOMMU_GROUP_NOTIFY_UNBIND_DRIVER;
788 break;
789 case BUS_NOTIFY_UNBOUND_DRIVER:
790 group_action = IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER;
791 break;
792 }
793
794 if (group_action)
795 blocking_notifier_call_chain(&group->notifier,
796 group_action, dev);
797
798 iommu_group_put(group);
Alex Williamson14604322011-10-21 15:56:05 -0400799 return 0;
800}
801
Mark Salterfb3e3062014-09-21 13:58:24 -0400802static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100803{
Mark Salterfb3e3062014-09-21 13:58:24 -0400804 int err;
805 struct notifier_block *nb;
Thierry Redingb22f6432014-06-27 09:03:12 +0200806 struct iommu_callback_data cb = {
807 .ops = ops,
808 };
809
Mark Salterfb3e3062014-09-21 13:58:24 -0400810 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
811 if (!nb)
812 return -ENOMEM;
813
814 nb->notifier_call = iommu_bus_notifier;
815
816 err = bus_register_notifier(bus, nb);
817 if (err) {
818 kfree(nb);
819 return err;
820 }
Heiko Stübnerd7da6bd2014-10-29 01:22:56 +0100821
822 err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
823 if (err) {
824 bus_unregister_notifier(bus, nb);
825 kfree(nb);
826 return err;
827 }
828
829 return 0;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100830}
831
Joerg Roedelff217762011-08-26 16:48:26 +0200832/**
833 * bus_set_iommu - set iommu-callbacks for the bus
834 * @bus: bus.
835 * @ops: the callbacks provided by the iommu-driver
836 *
837 * This function is called by an iommu driver to set the iommu methods
838 * used for a particular bus. Drivers for devices on that bus can use
839 * the iommu-api after these ops are registered.
840 * This special function is needed because IOMMUs are usually devices on
841 * the bus itself, so the iommu drivers are not initialized when the bus
842 * is set up. With this function the iommu-driver can set the iommu-ops
843 * afterwards.
844 */
Thierry Redingb22f6432014-06-27 09:03:12 +0200845int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100846{
Heiko Stübnerd7da6bd2014-10-29 01:22:56 +0100847 int err;
848
Joerg Roedelff217762011-08-26 16:48:26 +0200849 if (bus->iommu_ops != NULL)
850 return -EBUSY;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100851
Joerg Roedelff217762011-08-26 16:48:26 +0200852 bus->iommu_ops = ops;
853
854 /* Do IOMMU specific setup for this bus-type */
Heiko Stübnerd7da6bd2014-10-29 01:22:56 +0100855 err = iommu_bus_init(bus, ops);
856 if (err)
857 bus->iommu_ops = NULL;
858
859 return err;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100860}
Joerg Roedelff217762011-08-26 16:48:26 +0200861EXPORT_SYMBOL_GPL(bus_set_iommu);
862
Joerg Roedela1b60c12011-09-06 18:46:34 +0200863bool iommu_present(struct bus_type *bus)
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100864{
Joerg Roedel94441c32011-09-06 18:58:54 +0200865 return bus->iommu_ops != NULL;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100866}
Joerg Roedela1b60c12011-09-06 18:46:34 +0200867EXPORT_SYMBOL_GPL(iommu_present);
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100868
Joerg Roedel3c0e0ca2014-09-03 18:47:25 +0200869bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
870{
871 if (!bus->iommu_ops || !bus->iommu_ops->capable)
872 return false;
873
874 return bus->iommu_ops->capable(cap);
875}
876EXPORT_SYMBOL_GPL(iommu_capable);
877
Ohad Ben-Cohen4f3f8d92011-09-13 15:25:23 -0400878/**
879 * iommu_set_fault_handler() - set a fault handler for an iommu domain
880 * @domain: iommu domain
881 * @handler: fault handler
Ohad Ben-Cohen77ca2332012-05-21 20:20:05 +0300882 * @token: user data, will be passed back to the fault handler
Ohad Ben-Cohen0ed6d2d2011-09-27 07:36:40 -0400883 *
884 * This function should be used by IOMMU users which want to be notified
885 * whenever an IOMMU fault happens.
886 *
887 * The fault handler itself should return 0 on success, and an appropriate
888 * error code otherwise.
Ohad Ben-Cohen4f3f8d92011-09-13 15:25:23 -0400889 */
890void iommu_set_fault_handler(struct iommu_domain *domain,
Ohad Ben-Cohen77ca2332012-05-21 20:20:05 +0300891 iommu_fault_handler_t handler,
892 void *token)
Ohad Ben-Cohen4f3f8d92011-09-13 15:25:23 -0400893{
894 BUG_ON(!domain);
895
896 domain->handler = handler;
Ohad Ben-Cohen77ca2332012-05-21 20:20:05 +0300897 domain->handler_token = token;
Ohad Ben-Cohen4f3f8d92011-09-13 15:25:23 -0400898}
Ohad Ben-Cohen30bd9182011-09-26 09:11:46 -0400899EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
Ohad Ben-Cohen4f3f8d92011-09-13 15:25:23 -0400900
Joerg Roedel905d66c2011-09-06 16:03:26 +0200901struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100902{
903 struct iommu_domain *domain;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100904
Joerg Roedel94441c32011-09-06 18:58:54 +0200905 if (bus == NULL || bus->iommu_ops == NULL)
Joerg Roedel905d66c2011-09-06 16:03:26 +0200906 return NULL;
907
Joerg Roedel89be34a2015-03-26 13:43:19 +0100908 domain = bus->iommu_ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100909 if (!domain)
910 return NULL;
911
Joerg Roedel8539c7c2015-03-26 13:43:05 +0100912 domain->ops = bus->iommu_ops;
913 domain->type = IOMMU_DOMAIN_UNMANAGED;
Joerg Roedel905d66c2011-09-06 16:03:26 +0200914
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100915 return domain;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100916}
917EXPORT_SYMBOL_GPL(iommu_domain_alloc);
918
919void iommu_domain_free(struct iommu_domain *domain)
920{
Joerg Roedel89be34a2015-03-26 13:43:19 +0100921 domain->ops->domain_free(domain);
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100922}
923EXPORT_SYMBOL_GPL(iommu_domain_free);
924
925int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
926{
Shuah Khanb54db772013-08-15 11:59:26 -0600927 int ret;
Joerg Roedele5aa7f02011-09-06 16:44:29 +0200928 if (unlikely(domain->ops->attach_dev == NULL))
929 return -ENODEV;
930
Shuah Khanb54db772013-08-15 11:59:26 -0600931 ret = domain->ops->attach_dev(domain, dev);
932 if (!ret)
933 trace_attach_device_to_domain(dev);
934 return ret;
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100935}
936EXPORT_SYMBOL_GPL(iommu_attach_device);
937
938void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
939{
Joerg Roedele5aa7f02011-09-06 16:44:29 +0200940 if (unlikely(domain->ops->detach_dev == NULL))
941 return;
942
943 domain->ops->detach_dev(domain, dev);
Shuah Khan69980632013-08-15 11:59:27 -0600944 trace_detach_device_from_domain(dev);
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100945}
946EXPORT_SYMBOL_GPL(iommu_detach_device);
947
Alex Williamsond72e31c2012-05-30 14:18:53 -0600948/*
949 * IOMMU groups are really the natrual working unit of the IOMMU, but
950 * the IOMMU API works on domains and devices. Bridge that gap by
951 * iterating over the devices in a group. Ideally we'd have a single
952 * device which represents the requestor ID of the group, but we also
953 * allow IOMMU drivers to create policy defined minimum sets, where
954 * the physical hardware may be able to distiguish members, but we
955 * wish to group them at a higher level (ex. untrusted multi-function
956 * PCI devices). Thus we attach each device.
957 */
958static int iommu_group_do_attach_device(struct device *dev, void *data)
959{
960 struct iommu_domain *domain = data;
961
962 return iommu_attach_device(domain, dev);
963}
964
965int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
966{
967 return iommu_group_for_each_dev(group, domain,
968 iommu_group_do_attach_device);
969}
970EXPORT_SYMBOL_GPL(iommu_attach_group);
971
972static int iommu_group_do_detach_device(struct device *dev, void *data)
973{
974 struct iommu_domain *domain = data;
975
976 iommu_detach_device(domain, dev);
977
978 return 0;
979}
980
981void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
982{
983 iommu_group_for_each_dev(group, domain, iommu_group_do_detach_device);
984}
985EXPORT_SYMBOL_GPL(iommu_detach_group);
986
Varun Sethibb5547ac2013-03-29 01:23:58 +0530987phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100988{
Joerg Roedele5aa7f02011-09-06 16:44:29 +0200989 if (unlikely(domain->ops->iova_to_phys == NULL))
990 return 0;
991
992 return domain->ops->iova_to_phys(domain, iova);
Joerg Roedelfc2100e2008-11-26 17:21:24 +0100993}
994EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
Sheng Yangdbb9fd82009-03-18 15:33:06 +0800995
Alex Williamsonbd139692013-06-17 19:57:34 -0600996static size_t iommu_pgsize(struct iommu_domain *domain,
997 unsigned long addr_merge, size_t size)
998{
999 unsigned int pgsize_idx;
1000 size_t pgsize;
1001
1002 /* Max page size that still fits into 'size' */
1003 pgsize_idx = __fls(size);
1004
1005 /* need to consider alignment requirements ? */
1006 if (likely(addr_merge)) {
1007 /* Max page size allowed by address */
1008 unsigned int align_pgsize_idx = __ffs(addr_merge);
1009 pgsize_idx = min(pgsize_idx, align_pgsize_idx);
1010 }
1011
1012 /* build a mask of acceptable page sizes */
1013 pgsize = (1UL << (pgsize_idx + 1)) - 1;
1014
1015 /* throw away page sizes not supported by the hardware */
1016 pgsize &= domain->ops->pgsize_bitmap;
1017
1018 /* make sure we're still sane */
1019 BUG_ON(!pgsize);
1020
1021 /* pick the biggest page */
1022 pgsize_idx = __fls(pgsize);
1023 pgsize = 1UL << pgsize_idx;
1024
1025 return pgsize;
1026}
1027
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001028int iommu_map(struct iommu_domain *domain, unsigned long iova,
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001029 phys_addr_t paddr, size_t size, int prot)
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001030{
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001031 unsigned long orig_iova = iova;
1032 unsigned int min_pagesz;
1033 size_t orig_size = size;
1034 int ret = 0;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001035
Joerg Roedel9db4ad92014-08-19 00:19:26 +02001036 if (unlikely(domain->ops->map == NULL ||
Joerg Roedel57886512013-01-29 13:41:09 +01001037 domain->ops->pgsize_bitmap == 0UL))
Joerg Roedele5aa7f02011-09-06 16:44:29 +02001038 return -ENODEV;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001039
Joerg Roedela10315e2015-03-26 13:43:06 +01001040 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
1041 return -EINVAL;
1042
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001043 /* find out the minimum page size supported */
1044 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001045
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001046 /*
1047 * both the virtual address and the physical one, as well as
1048 * the size of the mapping, must be aligned (at least) to the
1049 * size of the smallest page supported by the hardware
1050 */
1051 if (!IS_ALIGNED(iova | paddr | size, min_pagesz)) {
Fabio Estevamabedb042013-08-22 10:25:42 -03001052 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
Joe Perches6197ca82013-06-23 12:29:04 -07001053 iova, &paddr, size, min_pagesz);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001054 return -EINVAL;
1055 }
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001056
Fabio Estevamabedb042013-08-22 10:25:42 -03001057 pr_debug("map: iova 0x%lx pa %pa size 0x%zx\n", iova, &paddr, size);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001058
1059 while (size) {
Alex Williamsonbd139692013-06-17 19:57:34 -06001060 size_t pgsize = iommu_pgsize(domain, iova | paddr, size);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001061
Fabio Estevamabedb042013-08-22 10:25:42 -03001062 pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
Joe Perches6197ca82013-06-23 12:29:04 -07001063 iova, &paddr, pgsize);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001064
1065 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
1066 if (ret)
1067 break;
1068
1069 iova += pgsize;
1070 paddr += pgsize;
1071 size -= pgsize;
1072 }
1073
1074 /* unroll mapping in case something went wrong */
1075 if (ret)
1076 iommu_unmap(domain, orig_iova, orig_size - size);
Shuah Khane0be7c82013-08-15 11:59:28 -06001077 else
Shuah Khan860cd64d2015-01-15 19:29:43 -07001078 trace_map(orig_iova, paddr, orig_size);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001079
1080 return ret;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001081}
1082EXPORT_SYMBOL_GPL(iommu_map);
1083
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001084size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001085{
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001086 size_t unmapped_page, unmapped = 0;
1087 unsigned int min_pagesz;
Shuah Khan6fd492f2015-01-16 16:47:19 -07001088 unsigned long orig_iova = iova;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001089
Joerg Roedel57886512013-01-29 13:41:09 +01001090 if (unlikely(domain->ops->unmap == NULL ||
1091 domain->ops->pgsize_bitmap == 0UL))
Joerg Roedele5aa7f02011-09-06 16:44:29 +02001092 return -ENODEV;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001093
Joerg Roedela10315e2015-03-26 13:43:06 +01001094 if (unlikely(!(domain->type & __IOMMU_DOMAIN_PAGING)))
1095 return -EINVAL;
1096
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001097 /* find out the minimum page size supported */
1098 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001099
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001100 /*
1101 * The virtual address, as well as the size of the mapping, must be
1102 * aligned (at least) to the size of the smallest page supported
1103 * by the hardware
1104 */
1105 if (!IS_ALIGNED(iova | size, min_pagesz)) {
Joe Perches6197ca82013-06-23 12:29:04 -07001106 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
1107 iova, size, min_pagesz);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001108 return -EINVAL;
1109 }
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001110
Joe Perches6197ca82013-06-23 12:29:04 -07001111 pr_debug("unmap this: iova 0x%lx size 0x%zx\n", iova, size);
Ohad Ben-Cohen50090652011-11-10 11:32:25 +02001112
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001113 /*
1114 * Keep iterating until we either unmap 'size' bytes (or more)
1115 * or we hit an area that isn't mapped.
1116 */
1117 while (unmapped < size) {
Alex Williamsonbd139692013-06-17 19:57:34 -06001118 size_t pgsize = iommu_pgsize(domain, iova, size - unmapped);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001119
Alex Williamsonbd139692013-06-17 19:57:34 -06001120 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001121 if (!unmapped_page)
1122 break;
1123
Joe Perches6197ca82013-06-23 12:29:04 -07001124 pr_debug("unmapped: iova 0x%lx size 0x%zx\n",
1125 iova, unmapped_page);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001126
1127 iova += unmapped_page;
1128 unmapped += unmapped_page;
1129 }
1130
Shuah Khandb8614d2015-01-16 20:53:17 -07001131 trace_unmap(orig_iova, size, unmapped);
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +02001132 return unmapped;
Joerg Roedelcefc53c2010-01-08 13:35:09 +01001133}
1134EXPORT_SYMBOL_GPL(iommu_unmap);
Alex Williamson14604322011-10-21 15:56:05 -04001135
Olav Haugan315786e2014-10-25 09:55:16 -07001136size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
1137 struct scatterlist *sg, unsigned int nents, int prot)
1138{
Joerg Roedel38ec0102014-11-04 14:53:51 +01001139 struct scatterlist *s;
Olav Haugan315786e2014-10-25 09:55:16 -07001140 size_t mapped = 0;
Robin Murphy18f23402014-11-25 17:50:55 +00001141 unsigned int i, min_pagesz;
Joerg Roedel38ec0102014-11-04 14:53:51 +01001142 int ret;
Olav Haugan315786e2014-10-25 09:55:16 -07001143
Robin Murphy18f23402014-11-25 17:50:55 +00001144 if (unlikely(domain->ops->pgsize_bitmap == 0UL))
1145 return 0;
Olav Haugan315786e2014-10-25 09:55:16 -07001146
Robin Murphy18f23402014-11-25 17:50:55 +00001147 min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
1148
1149 for_each_sg(sg, s, nents, i) {
1150 phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
1151
1152 /*
1153 * We are mapping on IOMMU page boundaries, so offset within
1154 * the page must be 0. However, the IOMMU may support pages
1155 * smaller than PAGE_SIZE, so s->offset may still represent
1156 * an offset of that boundary within the CPU page.
1157 */
1158 if (!IS_ALIGNED(s->offset, min_pagesz))
Joerg Roedel38ec0102014-11-04 14:53:51 +01001159 goto out_err;
1160
1161 ret = iommu_map(domain, iova + mapped, phys, s->length, prot);
1162 if (ret)
1163 goto out_err;
1164
1165 mapped += s->length;
Olav Haugan315786e2014-10-25 09:55:16 -07001166 }
1167
1168 return mapped;
Joerg Roedel38ec0102014-11-04 14:53:51 +01001169
1170out_err:
1171 /* undo mappings already done */
1172 iommu_unmap(domain, iova, mapped);
1173
1174 return 0;
1175
Olav Haugan315786e2014-10-25 09:55:16 -07001176}
1177EXPORT_SYMBOL_GPL(default_iommu_map_sg);
Joerg Roedeld7787d52013-01-29 14:26:20 +01001178
1179int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
Varun Sethi80f97f02013-03-29 01:24:00 +05301180 phys_addr_t paddr, u64 size, int prot)
Joerg Roedeld7787d52013-01-29 14:26:20 +01001181{
1182 if (unlikely(domain->ops->domain_window_enable == NULL))
1183 return -ENODEV;
1184
Varun Sethi80f97f02013-03-29 01:24:00 +05301185 return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
1186 prot);
Joerg Roedeld7787d52013-01-29 14:26:20 +01001187}
1188EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
1189
1190void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
1191{
1192 if (unlikely(domain->ops->domain_window_disable == NULL))
1193 return;
1194
1195 return domain->ops->domain_window_disable(domain, wnd_nr);
1196}
1197EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
1198
Alex Williamsond72e31c2012-05-30 14:18:53 -06001199static int __init iommu_init(void)
Alex Williamson14604322011-10-21 15:56:05 -04001200{
Alex Williamsond72e31c2012-05-30 14:18:53 -06001201 iommu_group_kset = kset_create_and_add("iommu_groups",
1202 NULL, kernel_kobj);
1203 ida_init(&iommu_group_ida);
1204 mutex_init(&iommu_group_mutex);
Alex Williamson14604322011-10-21 15:56:05 -04001205
Alex Williamsond72e31c2012-05-30 14:18:53 -06001206 BUG_ON(!iommu_group_kset);
1207
1208 return 0;
Alex Williamson14604322011-10-21 15:56:05 -04001209}
Alexey Kardashevskiy097e3632013-01-07 18:51:52 +11001210arch_initcall(iommu_init);
Joerg Roedel0cd76dd2012-01-26 19:40:52 +01001211
1212int iommu_domain_get_attr(struct iommu_domain *domain,
1213 enum iommu_attr attr, void *data)
1214{
Joerg Roedel0ff64f82012-01-26 19:40:53 +01001215 struct iommu_domain_geometry *geometry;
Joerg Roedeld2e12162013-01-29 13:49:04 +01001216 bool *paging;
Joerg Roedel0ff64f82012-01-26 19:40:53 +01001217 int ret = 0;
Joerg Roedel69356712013-02-04 14:00:01 +01001218 u32 *count;
Joerg Roedel0cd76dd2012-01-26 19:40:52 +01001219
Joerg Roedel0ff64f82012-01-26 19:40:53 +01001220 switch (attr) {
1221 case DOMAIN_ATTR_GEOMETRY:
1222 geometry = data;
1223 *geometry = domain->geometry;
1224
1225 break;
Joerg Roedeld2e12162013-01-29 13:49:04 +01001226 case DOMAIN_ATTR_PAGING:
1227 paging = data;
1228 *paging = (domain->ops->pgsize_bitmap != 0UL);
1229 break;
Joerg Roedel69356712013-02-04 14:00:01 +01001230 case DOMAIN_ATTR_WINDOWS:
1231 count = data;
1232
1233 if (domain->ops->domain_get_windows != NULL)
1234 *count = domain->ops->domain_get_windows(domain);
1235 else
1236 ret = -ENODEV;
1237
1238 break;
Joerg Roedel0ff64f82012-01-26 19:40:53 +01001239 default:
1240 if (!domain->ops->domain_get_attr)
1241 return -EINVAL;
1242
1243 ret = domain->ops->domain_get_attr(domain, attr, data);
1244 }
1245
1246 return ret;
Joerg Roedel0cd76dd2012-01-26 19:40:52 +01001247}
1248EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
1249
1250int iommu_domain_set_attr(struct iommu_domain *domain,
1251 enum iommu_attr attr, void *data)
1252{
Joerg Roedel69356712013-02-04 14:00:01 +01001253 int ret = 0;
1254 u32 *count;
Joerg Roedel0cd76dd2012-01-26 19:40:52 +01001255
Joerg Roedel69356712013-02-04 14:00:01 +01001256 switch (attr) {
1257 case DOMAIN_ATTR_WINDOWS:
1258 count = data;
1259
1260 if (domain->ops->domain_set_windows != NULL)
1261 ret = domain->ops->domain_set_windows(domain, *count);
1262 else
1263 ret = -ENODEV;
1264
1265 break;
1266 default:
1267 if (domain->ops->domain_set_attr == NULL)
1268 return -EINVAL;
1269
1270 ret = domain->ops->domain_set_attr(domain, attr, data);
1271 }
1272
1273 return ret;
Joerg Roedel0cd76dd2012-01-26 19:40:52 +01001274}
1275EXPORT_SYMBOL_GPL(iommu_domain_set_attr);