1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2010-2012 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <jroedel@suse.de>
5 */
6
7 #define pr_fmt(fmt) "AMD-Vi: " fmt
8
9 #include <linux/mmu_notifier.h>
10 #include <linux/amd-iommu.h>
11 #include <linux/mm_types.h>
12 #include <linux/profile.h>
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/sched/mm.h>
16 #include <linux/iommu.h>
17 #include <linux/wait.h>
18 #include <linux/pci.h>
19 #include <linux/gfp.h>
20
21 #include "amd_iommu_types.h"
22 #include "amd_iommu_proto.h"
23
24 MODULE_LICENSE("GPL v2");
25 MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>");
26
27 #define MAX_DEVICES 0x10000
28 #define PRI_QUEUE_SIZE 512
29
30 struct pri_queue {
31 atomic_t inflight;
32 bool finish;
33 int status;
34 };
35
36 struct pasid_state {
37 struct list_head list; /* For global state-list */
38 atomic_t count; /* Reference count */
39 unsigned mmu_notifier_count; /* Counting nested mmu_notifier
40 calls */
41 struct mm_struct *mm; /* mm_struct for the faults */
42 struct mmu_notifier mn; /* mmu_notifier handle */
43 struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */
44 struct device_state *device_state; /* Link to our device_state */
45 int pasid; /* PASID index */
46 bool invalid; /* Used during setup and
47 teardown of the pasid */
48 spinlock_t lock; /* Protect pri_queues and
49 mmu_notifer_count */
50 wait_queue_head_t wq; /* To wait for count == 0 */
51 };
52
53 struct device_state {
54 struct list_head list;
55 u16 devid;
56 atomic_t count;
57 struct pci_dev *pdev;
58 struct pasid_state **states;
59 struct iommu_domain *domain;
60 int pasid_levels;
61 int max_pasids;
62 amd_iommu_invalid_ppr_cb inv_ppr_cb;
63 amd_iommu_invalidate_ctx inv_ctx_cb;
64 spinlock_t lock;
65 wait_queue_head_t wq;
66 };
67
68 struct fault {
69 struct work_struct work;
70 struct device_state *dev_state;
71 struct pasid_state *state;
72 struct mm_struct *mm;
73 u64 address;
74 u16 devid;
75 u16 pasid;
76 u16 tag;
77 u16 finish;
78 u16 flags;
79 };
80
81 static LIST_HEAD(state_list);
82 static spinlock_t state_lock;
83
84 static struct workqueue_struct *iommu_wq;
85
86 static void free_pasid_states(struct device_state *dev_state);
87
device_id(struct pci_dev * pdev)88 static u16 device_id(struct pci_dev *pdev)
89 {
90 u16 devid;
91
92 devid = pdev->bus->number;
93 devid = (devid << 8) | pdev->devfn;
94
95 return devid;
96 }
97
__get_device_state(u16 devid)98 static struct device_state *__get_device_state(u16 devid)
99 {
100 struct device_state *dev_state;
101
102 list_for_each_entry(dev_state, &state_list, list) {
103 if (dev_state->devid == devid)
104 return dev_state;
105 }
106
107 return NULL;
108 }
109
get_device_state(u16 devid)110 static struct device_state *get_device_state(u16 devid)
111 {
112 struct device_state *dev_state;
113 unsigned long flags;
114
115 spin_lock_irqsave(&state_lock, flags);
116 dev_state = __get_device_state(devid);
117 if (dev_state != NULL)
118 atomic_inc(&dev_state->count);
119 spin_unlock_irqrestore(&state_lock, flags);
120
121 return dev_state;
122 }
123
free_device_state(struct device_state * dev_state)124 static void free_device_state(struct device_state *dev_state)
125 {
126 struct iommu_group *group;
127
128 /*
129 * First detach device from domain - No more PRI requests will arrive
130 * from that device after it is unbound from the IOMMUv2 domain.
131 */
132 group = iommu_group_get(&dev_state->pdev->dev);
133 if (WARN_ON(!group))
134 return;
135
136 iommu_detach_group(dev_state->domain, group);
137
138 iommu_group_put(group);
139
140 /* Everything is down now, free the IOMMUv2 domain */
141 iommu_domain_free(dev_state->domain);
142
143 /* Finally get rid of the device-state */
144 kfree(dev_state);
145 }
146
put_device_state(struct device_state * dev_state)147 static void put_device_state(struct device_state *dev_state)
148 {
149 if (atomic_dec_and_test(&dev_state->count))
150 wake_up(&dev_state->wq);
151 }
152
153 /* Must be called under dev_state->lock */
__get_pasid_state_ptr(struct device_state * dev_state,int pasid,bool alloc)154 static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
155 int pasid, bool alloc)
156 {
157 struct pasid_state **root, **ptr;
158 int level, index;
159
160 level = dev_state->pasid_levels;
161 root = dev_state->states;
162
163 while (true) {
164
165 index = (pasid >> (9 * level)) & 0x1ff;
166 ptr = &root[index];
167
168 if (level == 0)
169 break;
170
171 if (*ptr == NULL) {
172 if (!alloc)
173 return NULL;
174
175 *ptr = (void *)get_zeroed_page(GFP_ATOMIC);
176 if (*ptr == NULL)
177 return NULL;
178 }
179
180 root = (struct pasid_state **)*ptr;
181 level -= 1;
182 }
183
184 return ptr;
185 }
186
set_pasid_state(struct device_state * dev_state,struct pasid_state * pasid_state,int pasid)187 static int set_pasid_state(struct device_state *dev_state,
188 struct pasid_state *pasid_state,
189 int pasid)
190 {
191 struct pasid_state **ptr;
192 unsigned long flags;
193 int ret;
194
195 spin_lock_irqsave(&dev_state->lock, flags);
196 ptr = __get_pasid_state_ptr(dev_state, pasid, true);
197
198 ret = -ENOMEM;
199 if (ptr == NULL)
200 goto out_unlock;
201
202 ret = -ENOMEM;
203 if (*ptr != NULL)
204 goto out_unlock;
205
206 *ptr = pasid_state;
207
208 ret = 0;
209
210 out_unlock:
211 spin_unlock_irqrestore(&dev_state->lock, flags);
212
213 return ret;
214 }
215
clear_pasid_state(struct device_state * dev_state,int pasid)216 static void clear_pasid_state(struct device_state *dev_state, int pasid)
217 {
218 struct pasid_state **ptr;
219 unsigned long flags;
220
221 spin_lock_irqsave(&dev_state->lock, flags);
222 ptr = __get_pasid_state_ptr(dev_state, pasid, true);
223
224 if (ptr == NULL)
225 goto out_unlock;
226
227 *ptr = NULL;
228
229 out_unlock:
230 spin_unlock_irqrestore(&dev_state->lock, flags);
231 }
232
get_pasid_state(struct device_state * dev_state,int pasid)233 static struct pasid_state *get_pasid_state(struct device_state *dev_state,
234 int pasid)
235 {
236 struct pasid_state **ptr, *ret = NULL;
237 unsigned long flags;
238
239 spin_lock_irqsave(&dev_state->lock, flags);
240 ptr = __get_pasid_state_ptr(dev_state, pasid, false);
241
242 if (ptr == NULL)
243 goto out_unlock;
244
245 ret = *ptr;
246 if (ret)
247 atomic_inc(&ret->count);
248
249 out_unlock:
250 spin_unlock_irqrestore(&dev_state->lock, flags);
251
252 return ret;
253 }
254
free_pasid_state(struct pasid_state * pasid_state)255 static void free_pasid_state(struct pasid_state *pasid_state)
256 {
257 kfree(pasid_state);
258 }
259
put_pasid_state(struct pasid_state * pasid_state)260 static void put_pasid_state(struct pasid_state *pasid_state)
261 {
262 if (atomic_dec_and_test(&pasid_state->count))
263 wake_up(&pasid_state->wq);
264 }
265
put_pasid_state_wait(struct pasid_state * pasid_state)266 static void put_pasid_state_wait(struct pasid_state *pasid_state)
267 {
268 atomic_dec(&pasid_state->count);
269 wait_event(pasid_state->wq, !atomic_read(&pasid_state->count));
270 free_pasid_state(pasid_state);
271 }
272
unbind_pasid(struct pasid_state * pasid_state)273 static void unbind_pasid(struct pasid_state *pasid_state)
274 {
275 struct iommu_domain *domain;
276
277 domain = pasid_state->device_state->domain;
278
279 /*
280 * Mark pasid_state as invalid, no more faults will we added to the
281 * work queue after this is visible everywhere.
282 */
283 pasid_state->invalid = true;
284
285 /* Make sure this is visible */
286 smp_wmb();
287
288 /* After this the device/pasid can't access the mm anymore */
289 amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid);
290
291 /* Make sure no more pending faults are in the queue */
292 flush_workqueue(iommu_wq);
293 }
294
free_pasid_states_level1(struct pasid_state ** tbl)295 static void free_pasid_states_level1(struct pasid_state **tbl)
296 {
297 int i;
298
299 for (i = 0; i < 512; ++i) {
300 if (tbl[i] == NULL)
301 continue;
302
303 free_page((unsigned long)tbl[i]);
304 }
305 }
306
free_pasid_states_level2(struct pasid_state ** tbl)307 static void free_pasid_states_level2(struct pasid_state **tbl)
308 {
309 struct pasid_state **ptr;
310 int i;
311
312 for (i = 0; i < 512; ++i) {
313 if (tbl[i] == NULL)
314 continue;
315
316 ptr = (struct pasid_state **)tbl[i];
317 free_pasid_states_level1(ptr);
318 }
319 }
320
free_pasid_states(struct device_state * dev_state)321 static void free_pasid_states(struct device_state *dev_state)
322 {
323 struct pasid_state *pasid_state;
324 int i;
325
326 for (i = 0; i < dev_state->max_pasids; ++i) {
327 pasid_state = get_pasid_state(dev_state, i);
328 if (pasid_state == NULL)
329 continue;
330
331 put_pasid_state(pasid_state);
332
333 /*
334 * This will call the mn_release function and
335 * unbind the PASID
336 */
337 mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
338
339 put_pasid_state_wait(pasid_state); /* Reference taken in
340 amd_iommu_bind_pasid */
341
342 /* Drop reference taken in amd_iommu_bind_pasid */
343 put_device_state(dev_state);
344 }
345
346 if (dev_state->pasid_levels == 2)
347 free_pasid_states_level2(dev_state->states);
348 else if (dev_state->pasid_levels == 1)
349 free_pasid_states_level1(dev_state->states);
350 else
351 BUG_ON(dev_state->pasid_levels != 0);
352
353 free_page((unsigned long)dev_state->states);
354 }
355
mn_to_state(struct mmu_notifier * mn)356 static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
357 {
358 return container_of(mn, struct pasid_state, mn);
359 }
360
mn_invalidate_range(struct mmu_notifier * mn,struct mm_struct * mm,unsigned long start,unsigned long end)361 static void mn_invalidate_range(struct mmu_notifier *mn,
362 struct mm_struct *mm,
363 unsigned long start, unsigned long end)
364 {
365 struct pasid_state *pasid_state;
366 struct device_state *dev_state;
367
368 pasid_state = mn_to_state(mn);
369 dev_state = pasid_state->device_state;
370
371 if ((start ^ (end - 1)) < PAGE_SIZE)
372 amd_iommu_flush_page(dev_state->domain, pasid_state->pasid,
373 start);
374 else
375 amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid);
376 }
377
mn_release(struct mmu_notifier * mn,struct mm_struct * mm)378 static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
379 {
380 struct pasid_state *pasid_state;
381 struct device_state *dev_state;
382 bool run_inv_ctx_cb;
383
384 might_sleep();
385
386 pasid_state = mn_to_state(mn);
387 dev_state = pasid_state->device_state;
388 run_inv_ctx_cb = !pasid_state->invalid;
389
390 if (run_inv_ctx_cb && dev_state->inv_ctx_cb)
391 dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid);
392
393 unbind_pasid(pasid_state);
394 }
395
396 static const struct mmu_notifier_ops iommu_mn = {
397 .release = mn_release,
398 .invalidate_range = mn_invalidate_range,
399 };
400
set_pri_tag_status(struct pasid_state * pasid_state,u16 tag,int status)401 static void set_pri_tag_status(struct pasid_state *pasid_state,
402 u16 tag, int status)
403 {
404 unsigned long flags;
405
406 spin_lock_irqsave(&pasid_state->lock, flags);
407 pasid_state->pri[tag].status = status;
408 spin_unlock_irqrestore(&pasid_state->lock, flags);
409 }
410
finish_pri_tag(struct device_state * dev_state,struct pasid_state * pasid_state,u16 tag)411 static void finish_pri_tag(struct device_state *dev_state,
412 struct pasid_state *pasid_state,
413 u16 tag)
414 {
415 unsigned long flags;
416
417 spin_lock_irqsave(&pasid_state->lock, flags);
418 if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) &&
419 pasid_state->pri[tag].finish) {
420 amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid,
421 pasid_state->pri[tag].status, tag);
422 pasid_state->pri[tag].finish = false;
423 pasid_state->pri[tag].status = PPR_SUCCESS;
424 }
425 spin_unlock_irqrestore(&pasid_state->lock, flags);
426 }
427
handle_fault_error(struct fault * fault)428 static void handle_fault_error(struct fault *fault)
429 {
430 int status;
431
432 if (!fault->dev_state->inv_ppr_cb) {
433 set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
434 return;
435 }
436
437 status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev,
438 fault->pasid,
439 fault->address,
440 fault->flags);
441 switch (status) {
442 case AMD_IOMMU_INV_PRI_RSP_SUCCESS:
443 set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS);
444 break;
445 case AMD_IOMMU_INV_PRI_RSP_INVALID:
446 set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
447 break;
448 case AMD_IOMMU_INV_PRI_RSP_FAIL:
449 set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE);
450 break;
451 default:
452 BUG();
453 }
454 }
455
access_error(struct vm_area_struct * vma,struct fault * fault)456 static bool access_error(struct vm_area_struct *vma, struct fault *fault)
457 {
458 unsigned long requested = 0;
459
460 if (fault->flags & PPR_FAULT_EXEC)
461 requested |= VM_EXEC;
462
463 if (fault->flags & PPR_FAULT_READ)
464 requested |= VM_READ;
465
466 if (fault->flags & PPR_FAULT_WRITE)
467 requested |= VM_WRITE;
468
469 return (requested & ~vma->vm_flags) != 0;
470 }
471
do_fault(struct work_struct * work)472 static void do_fault(struct work_struct *work)
473 {
474 struct fault *fault = container_of(work, struct fault, work);
475 struct vm_area_struct *vma;
476 vm_fault_t ret = VM_FAULT_ERROR;
477 unsigned int flags = 0;
478 struct mm_struct *mm;
479 u64 address;
480
481 mm = fault->state->mm;
482 address = fault->address;
483
484 if (fault->flags & PPR_FAULT_USER)
485 flags |= FAULT_FLAG_USER;
486 if (fault->flags & PPR_FAULT_WRITE)
487 flags |= FAULT_FLAG_WRITE;
488 flags |= FAULT_FLAG_REMOTE;
489
490 down_read(&mm->mmap_sem);
491 vma = find_extend_vma(mm, address);
492 if (!vma || address < vma->vm_start)
493 /* failed to get a vma in the right range */
494 goto out;
495
496 /* Check if we have the right permissions on the vma */
497 if (access_error(vma, fault))
498 goto out;
499
500 ret = handle_mm_fault(vma, address, flags);
501 out:
502 up_read(&mm->mmap_sem);
503
504 if (ret & VM_FAULT_ERROR)
505 /* failed to service fault */
506 handle_fault_error(fault);
507
508 finish_pri_tag(fault->dev_state, fault->state, fault->tag);
509
510 put_pasid_state(fault->state);
511
512 kfree(fault);
513 }
514
ppr_notifier(struct notifier_block * nb,unsigned long e,void * data)515 static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
516 {
517 struct amd_iommu_fault *iommu_fault;
518 struct pasid_state *pasid_state;
519 struct device_state *dev_state;
520 unsigned long flags;
521 struct fault *fault;
522 bool finish;
523 u16 tag, devid;
524 int ret;
525 struct iommu_dev_data *dev_data;
526 struct pci_dev *pdev = NULL;
527
528 iommu_fault = data;
529 tag = iommu_fault->tag & 0x1ff;
530 finish = (iommu_fault->tag >> 9) & 1;
531
532 devid = iommu_fault->device_id;
533 pdev = pci_get_domain_bus_and_slot(0, PCI_BUS_NUM(devid),
534 devid & 0xff);
535 if (!pdev)
536 return -ENODEV;
537 dev_data = get_dev_data(&pdev->dev);
538
539 /* In kdump kernel pci dev is not initialized yet -> send INVALID */
540 ret = NOTIFY_DONE;
541 if (translation_pre_enabled(amd_iommu_rlookup_table[devid])
542 && dev_data->defer_attach) {
543 amd_iommu_complete_ppr(pdev, iommu_fault->pasid,
544 PPR_INVALID, tag);
545 goto out;
546 }
547
548 dev_state = get_device_state(iommu_fault->device_id);
549 if (dev_state == NULL)
550 goto out;
551
552 pasid_state = get_pasid_state(dev_state, iommu_fault->pasid);
553 if (pasid_state == NULL || pasid_state->invalid) {
554 /* We know the device but not the PASID -> send INVALID */
555 amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid,
556 PPR_INVALID, tag);
557 goto out_drop_state;
558 }
559
560 spin_lock_irqsave(&pasid_state->lock, flags);
561 atomic_inc(&pasid_state->pri[tag].inflight);
562 if (finish)
563 pasid_state->pri[tag].finish = true;
564 spin_unlock_irqrestore(&pasid_state->lock, flags);
565
566 fault = kzalloc(sizeof(*fault), GFP_ATOMIC);
567 if (fault == NULL) {
568 /* We are OOM - send success and let the device re-fault */
569 finish_pri_tag(dev_state, pasid_state, tag);
570 goto out_drop_state;
571 }
572
573 fault->dev_state = dev_state;
574 fault->address = iommu_fault->address;
575 fault->state = pasid_state;
576 fault->tag = tag;
577 fault->finish = finish;
578 fault->pasid = iommu_fault->pasid;
579 fault->flags = iommu_fault->flags;
580 INIT_WORK(&fault->work, do_fault);
581
582 queue_work(iommu_wq, &fault->work);
583
584 ret = NOTIFY_OK;
585
586 out_drop_state:
587
588 if (ret != NOTIFY_OK && pasid_state)
589 put_pasid_state(pasid_state);
590
591 put_device_state(dev_state);
592
593 out:
594 return ret;
595 }
596
597 static struct notifier_block ppr_nb = {
598 .notifier_call = ppr_notifier,
599 };
600
amd_iommu_bind_pasid(struct pci_dev * pdev,int pasid,struct task_struct * task)601 int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
602 struct task_struct *task)
603 {
604 struct pasid_state *pasid_state;
605 struct device_state *dev_state;
606 struct mm_struct *mm;
607 u16 devid;
608 int ret;
609
610 might_sleep();
611
612 if (!amd_iommu_v2_supported())
613 return -ENODEV;
614
615 devid = device_id(pdev);
616 dev_state = get_device_state(devid);
617
618 if (dev_state == NULL)
619 return -EINVAL;
620
621 ret = -EINVAL;
622 if (pasid < 0 || pasid >= dev_state->max_pasids)
623 goto out;
624
625 ret = -ENOMEM;
626 pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
627 if (pasid_state == NULL)
628 goto out;
629
630
631 atomic_set(&pasid_state->count, 1);
632 init_waitqueue_head(&pasid_state->wq);
633 spin_lock_init(&pasid_state->lock);
634
635 mm = get_task_mm(task);
636 pasid_state->mm = mm;
637 pasid_state->device_state = dev_state;
638 pasid_state->pasid = pasid;
639 pasid_state->invalid = true; /* Mark as valid only if we are
640 done with setting up the pasid */
641 pasid_state->mn.ops = &iommu_mn;
642
643 if (pasid_state->mm == NULL)
644 goto out_free;
645
646 mmu_notifier_register(&pasid_state->mn, mm);
647
648 ret = set_pasid_state(dev_state, pasid_state, pasid);
649 if (ret)
650 goto out_unregister;
651
652 ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
653 __pa(pasid_state->mm->pgd));
654 if (ret)
655 goto out_clear_state;
656
657 /* Now we are ready to handle faults */
658 pasid_state->invalid = false;
659
660 /*
661 * Drop the reference to the mm_struct here. We rely on the
662 * mmu_notifier release call-back to inform us when the mm
663 * is going away.
664 */
665 mmput(mm);
666
667 return 0;
668
669 out_clear_state:
670 clear_pasid_state(dev_state, pasid);
671
672 out_unregister:
673 mmu_notifier_unregister(&pasid_state->mn, mm);
674 mmput(mm);
675
676 out_free:
677 free_pasid_state(pasid_state);
678
679 out:
680 put_device_state(dev_state);
681
682 return ret;
683 }
684 EXPORT_SYMBOL(amd_iommu_bind_pasid);
685
amd_iommu_unbind_pasid(struct pci_dev * pdev,int pasid)686 void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
687 {
688 struct pasid_state *pasid_state;
689 struct device_state *dev_state;
690 u16 devid;
691
692 might_sleep();
693
694 if (!amd_iommu_v2_supported())
695 return;
696
697 devid = device_id(pdev);
698 dev_state = get_device_state(devid);
699 if (dev_state == NULL)
700 return;
701
702 if (pasid < 0 || pasid >= dev_state->max_pasids)
703 goto out;
704
705 pasid_state = get_pasid_state(dev_state, pasid);
706 if (pasid_state == NULL)
707 goto out;
708 /*
709 * Drop reference taken here. We are safe because we still hold
710 * the reference taken in the amd_iommu_bind_pasid function.
711 */
712 put_pasid_state(pasid_state);
713
714 /* Clear the pasid state so that the pasid can be re-used */
715 clear_pasid_state(dev_state, pasid_state->pasid);
716
717 /*
718 * Call mmu_notifier_unregister to drop our reference
719 * to pasid_state->mm
720 */
721 mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
722
723 put_pasid_state_wait(pasid_state); /* Reference taken in
724 amd_iommu_bind_pasid */
725 out:
726 /* Drop reference taken in this function */
727 put_device_state(dev_state);
728
729 /* Drop reference taken in amd_iommu_bind_pasid */
730 put_device_state(dev_state);
731 }
732 EXPORT_SYMBOL(amd_iommu_unbind_pasid);
733
amd_iommu_init_device(struct pci_dev * pdev,int pasids)734 int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
735 {
736 struct device_state *dev_state;
737 struct iommu_group *group;
738 unsigned long flags;
739 int ret, tmp;
740 u16 devid;
741
742 might_sleep();
743
744 if (!amd_iommu_v2_supported())
745 return -ENODEV;
746
747 if (pasids <= 0 || pasids > (PASID_MASK + 1))
748 return -EINVAL;
749
750 devid = device_id(pdev);
751
752 dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL);
753 if (dev_state == NULL)
754 return -ENOMEM;
755
756 spin_lock_init(&dev_state->lock);
757 init_waitqueue_head(&dev_state->wq);
758 dev_state->pdev = pdev;
759 dev_state->devid = devid;
760
761 tmp = pasids;
762 for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9)
763 dev_state->pasid_levels += 1;
764
765 atomic_set(&dev_state->count, 1);
766 dev_state->max_pasids = pasids;
767
768 ret = -ENOMEM;
769 dev_state->states = (void *)get_zeroed_page(GFP_KERNEL);
770 if (dev_state->states == NULL)
771 goto out_free_dev_state;
772
773 dev_state->domain = iommu_domain_alloc(&pci_bus_type);
774 if (dev_state->domain == NULL)
775 goto out_free_states;
776
777 amd_iommu_domain_direct_map(dev_state->domain);
778
779 ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids);
780 if (ret)
781 goto out_free_domain;
782
783 group = iommu_group_get(&pdev->dev);
784 if (!group) {
785 ret = -EINVAL;
786 goto out_free_domain;
787 }
788
789 ret = iommu_attach_group(dev_state->domain, group);
790 if (ret != 0)
791 goto out_drop_group;
792
793 iommu_group_put(group);
794
795 spin_lock_irqsave(&state_lock, flags);
796
797 if (__get_device_state(devid) != NULL) {
798 spin_unlock_irqrestore(&state_lock, flags);
799 ret = -EBUSY;
800 goto out_free_domain;
801 }
802
803 list_add_tail(&dev_state->list, &state_list);
804
805 spin_unlock_irqrestore(&state_lock, flags);
806
807 return 0;
808
809 out_drop_group:
810 iommu_group_put(group);
811
812 out_free_domain:
813 iommu_domain_free(dev_state->domain);
814
815 out_free_states:
816 free_page((unsigned long)dev_state->states);
817
818 out_free_dev_state:
819 kfree(dev_state);
820
821 return ret;
822 }
823 EXPORT_SYMBOL(amd_iommu_init_device);
824
amd_iommu_free_device(struct pci_dev * pdev)825 void amd_iommu_free_device(struct pci_dev *pdev)
826 {
827 struct device_state *dev_state;
828 unsigned long flags;
829 u16 devid;
830
831 if (!amd_iommu_v2_supported())
832 return;
833
834 devid = device_id(pdev);
835
836 spin_lock_irqsave(&state_lock, flags);
837
838 dev_state = __get_device_state(devid);
839 if (dev_state == NULL) {
840 spin_unlock_irqrestore(&state_lock, flags);
841 return;
842 }
843
844 list_del(&dev_state->list);
845
846 spin_unlock_irqrestore(&state_lock, flags);
847
848 /* Get rid of any remaining pasid states */
849 free_pasid_states(dev_state);
850
851 put_device_state(dev_state);
852 /*
853 * Wait until the last reference is dropped before freeing
854 * the device state.
855 */
856 wait_event(dev_state->wq, !atomic_read(&dev_state->count));
857 free_device_state(dev_state);
858 }
859 EXPORT_SYMBOL(amd_iommu_free_device);
860
amd_iommu_set_invalid_ppr_cb(struct pci_dev * pdev,amd_iommu_invalid_ppr_cb cb)861 int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
862 amd_iommu_invalid_ppr_cb cb)
863 {
864 struct device_state *dev_state;
865 unsigned long flags;
866 u16 devid;
867 int ret;
868
869 if (!amd_iommu_v2_supported())
870 return -ENODEV;
871
872 devid = device_id(pdev);
873
874 spin_lock_irqsave(&state_lock, flags);
875
876 ret = -EINVAL;
877 dev_state = __get_device_state(devid);
878 if (dev_state == NULL)
879 goto out_unlock;
880
881 dev_state->inv_ppr_cb = cb;
882
883 ret = 0;
884
885 out_unlock:
886 spin_unlock_irqrestore(&state_lock, flags);
887
888 return ret;
889 }
890 EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
891
amd_iommu_set_invalidate_ctx_cb(struct pci_dev * pdev,amd_iommu_invalidate_ctx cb)892 int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
893 amd_iommu_invalidate_ctx cb)
894 {
895 struct device_state *dev_state;
896 unsigned long flags;
897 u16 devid;
898 int ret;
899
900 if (!amd_iommu_v2_supported())
901 return -ENODEV;
902
903 devid = device_id(pdev);
904
905 spin_lock_irqsave(&state_lock, flags);
906
907 ret = -EINVAL;
908 dev_state = __get_device_state(devid);
909 if (dev_state == NULL)
910 goto out_unlock;
911
912 dev_state->inv_ctx_cb = cb;
913
914 ret = 0;
915
916 out_unlock:
917 spin_unlock_irqrestore(&state_lock, flags);
918
919 return ret;
920 }
921 EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
922
amd_iommu_v2_init(void)923 static int __init amd_iommu_v2_init(void)
924 {
925 int ret;
926
927 pr_info("AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>\n");
928
929 if (!amd_iommu_v2_supported()) {
930 pr_info("AMD IOMMUv2 functionality not available on this system\n");
931 /*
932 * Load anyway to provide the symbols to other modules
933 * which may use AMD IOMMUv2 optionally.
934 */
935 return 0;
936 }
937
938 spin_lock_init(&state_lock);
939
940 ret = -ENOMEM;
941 iommu_wq = alloc_workqueue("amd_iommu_v2", WQ_MEM_RECLAIM, 0);
942 if (iommu_wq == NULL)
943 goto out;
944
945 amd_iommu_register_ppr_notifier(&ppr_nb);
946
947 return 0;
948
949 out:
950 return ret;
951 }
952
amd_iommu_v2_exit(void)953 static void __exit amd_iommu_v2_exit(void)
954 {
955 struct device_state *dev_state;
956 int i;
957
958 if (!amd_iommu_v2_supported())
959 return;
960
961 amd_iommu_unregister_ppr_notifier(&ppr_nb);
962
963 flush_workqueue(iommu_wq);
964
965 /*
966 * The loop below might call flush_workqueue(), so call
967 * destroy_workqueue() after it
968 */
969 for (i = 0; i < MAX_DEVICES; ++i) {
970 dev_state = get_device_state(i);
971
972 if (dev_state == NULL)
973 continue;
974
975 WARN_ON_ONCE(1);
976
977 put_device_state(dev_state);
978 amd_iommu_free_device(dev_state->pdev);
979 }
980
981 destroy_workqueue(iommu_wq);
982 }
983
984 module_init(amd_iommu_v2_init);
985 module_exit(amd_iommu_v2_exit);
986
