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Joerg Roedele3c495c2011-11-09 12:31:15 +01001/*
2 * Copyright (C) 2010-2012 Advanced Micro Devices, Inc.
Joerg Roedel63ce3ae2015-02-04 16:12:55 +01003 * Author: Joerg Roedel <jroedel@suse.de>
Joerg Roedele3c495c2011-11-09 12:31:15 +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
Joerg Roedel8736b2c2011-11-24 16:21:52 +010019#include <linux/mmu_notifier.h>
Joerg Roedeled96f222011-11-23 17:30:39 +010020#include <linux/amd-iommu.h>
21#include <linux/mm_types.h>
Joerg Roedel8736b2c2011-11-24 16:21:52 +010022#include <linux/profile.h>
Joerg Roedele3c495c2011-11-09 12:31:15 +010023#include <linux/module.h>
Joerg Roedel2d5503b2011-11-24 10:41:57 +010024#include <linux/sched.h>
Joerg Roedeled96f222011-11-23 17:30:39 +010025#include <linux/iommu.h>
Joerg Roedel028eeac2011-11-24 12:48:13 +010026#include <linux/wait.h>
Joerg Roedeled96f222011-11-23 17:30:39 +010027#include <linux/pci.h>
28#include <linux/gfp.h>
29
Joerg Roedel028eeac2011-11-24 12:48:13 +010030#include "amd_iommu_types.h"
Joerg Roedeled96f222011-11-23 17:30:39 +010031#include "amd_iommu_proto.h"
Joerg Roedele3c495c2011-11-09 12:31:15 +010032
33MODULE_LICENSE("GPL v2");
Joerg Roedel63ce3ae2015-02-04 16:12:55 +010034MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>");
Joerg Roedele3c495c2011-11-09 12:31:15 +010035
Joerg Roedeled96f222011-11-23 17:30:39 +010036#define MAX_DEVICES 0x10000
37#define PRI_QUEUE_SIZE 512
38
39struct pri_queue {
40 atomic_t inflight;
41 bool finish;
Joerg Roedel028eeac2011-11-24 12:48:13 +010042 int status;
Joerg Roedeled96f222011-11-23 17:30:39 +010043};
44
45struct pasid_state {
46 struct list_head list; /* For global state-list */
47 atomic_t count; /* Reference count */
Joerg Roedeld73a6d72014-06-20 16:14:22 +020048 unsigned mmu_notifier_count; /* Counting nested mmu_notifier
Joerg Roedele79df312014-05-20 23:18:26 +020049 calls */
Joerg Roedeled96f222011-11-23 17:30:39 +010050 struct mm_struct *mm; /* mm_struct for the faults */
Joerg Roedelff6d0cc2014-07-08 12:49:50 +020051 struct mmu_notifier mn; /* mmu_notifier handle */
Joerg Roedeled96f222011-11-23 17:30:39 +010052 struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */
53 struct device_state *device_state; /* Link to our device_state */
54 int pasid; /* PASID index */
Joerg Roedeld9e16112014-07-09 15:43:11 +020055 bool invalid; /* Used during setup and
56 teardown of the pasid */
Joerg Roedeld73a6d72014-06-20 16:14:22 +020057 spinlock_t lock; /* Protect pri_queues and
58 mmu_notifer_count */
Joerg Roedel028eeac2011-11-24 12:48:13 +010059 wait_queue_head_t wq; /* To wait for count == 0 */
Joerg Roedeled96f222011-11-23 17:30:39 +010060};
61
62struct device_state {
Joerg Roedel741669c2014-05-20 23:18:23 +020063 struct list_head list;
64 u16 devid;
Joerg Roedeled96f222011-11-23 17:30:39 +010065 atomic_t count;
66 struct pci_dev *pdev;
67 struct pasid_state **states;
68 struct iommu_domain *domain;
69 int pasid_levels;
70 int max_pasids;
Joerg Roedel175d6142011-11-28 14:36:36 +010071 amd_iommu_invalid_ppr_cb inv_ppr_cb;
Joerg Roedelbc216622011-12-07 12:24:42 +010072 amd_iommu_invalidate_ctx inv_ctx_cb;
Joerg Roedeled96f222011-11-23 17:30:39 +010073 spinlock_t lock;
Joerg Roedel028eeac2011-11-24 12:48:13 +010074 wait_queue_head_t wq;
75};
76
77struct fault {
78 struct work_struct work;
79 struct device_state *dev_state;
80 struct pasid_state *state;
81 struct mm_struct *mm;
82 u64 address;
83 u16 devid;
84 u16 pasid;
85 u16 tag;
86 u16 finish;
87 u16 flags;
Joerg Roedeled96f222011-11-23 17:30:39 +010088};
89
Joerg Roedel741669c2014-05-20 23:18:23 +020090static LIST_HEAD(state_list);
Joerg Roedeled96f222011-11-23 17:30:39 +010091static spinlock_t state_lock;
92
Joerg Roedel028eeac2011-11-24 12:48:13 +010093static struct workqueue_struct *iommu_wq;
94
Joerg Roedel2d5503b2011-11-24 10:41:57 +010095static void free_pasid_states(struct device_state *dev_state);
Joerg Roedeled96f222011-11-23 17:30:39 +010096
97static u16 device_id(struct pci_dev *pdev)
98{
99 u16 devid;
100
101 devid = pdev->bus->number;
102 devid = (devid << 8) | pdev->devfn;
103
104 return devid;
105}
106
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200107static struct device_state *__get_device_state(u16 devid)
108{
Joerg Roedel741669c2014-05-20 23:18:23 +0200109 struct device_state *dev_state;
110
111 list_for_each_entry(dev_state, &state_list, list) {
112 if (dev_state->devid == devid)
113 return dev_state;
114 }
115
116 return NULL;
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200117}
118
Joerg Roedeled96f222011-11-23 17:30:39 +0100119static struct device_state *get_device_state(u16 devid)
120{
121 struct device_state *dev_state;
122 unsigned long flags;
123
124 spin_lock_irqsave(&state_lock, flags);
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200125 dev_state = __get_device_state(devid);
Joerg Roedeled96f222011-11-23 17:30:39 +0100126 if (dev_state != NULL)
127 atomic_inc(&dev_state->count);
128 spin_unlock_irqrestore(&state_lock, flags);
129
130 return dev_state;
131}
132
133static void free_device_state(struct device_state *dev_state)
134{
Joerg Roedel55c99a42015-07-28 16:58:47 +0200135 struct iommu_group *group;
136
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100137 /*
138 * First detach device from domain - No more PRI requests will arrive
139 * from that device after it is unbound from the IOMMUv2 domain.
140 */
Joerg Roedel55c99a42015-07-28 16:58:47 +0200141 group = iommu_group_get(&dev_state->pdev->dev);
142 if (WARN_ON(!group))
143 return;
144
145 iommu_detach_group(dev_state->domain, group);
146
147 iommu_group_put(group);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100148
149 /* Everything is down now, free the IOMMUv2 domain */
Joerg Roedeled96f222011-11-23 17:30:39 +0100150 iommu_domain_free(dev_state->domain);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100151
152 /* Finally get rid of the device-state */
Joerg Roedeled96f222011-11-23 17:30:39 +0100153 kfree(dev_state);
154}
155
156static void put_device_state(struct device_state *dev_state)
157{
158 if (atomic_dec_and_test(&dev_state->count))
Joerg Roedel028eeac2011-11-24 12:48:13 +0100159 wake_up(&dev_state->wq);
Joerg Roedeled96f222011-11-23 17:30:39 +0100160}
161
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100162/* Must be called under dev_state->lock */
163static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
164 int pasid, bool alloc)
165{
166 struct pasid_state **root, **ptr;
167 int level, index;
168
169 level = dev_state->pasid_levels;
170 root = dev_state->states;
171
172 while (true) {
173
174 index = (pasid >> (9 * level)) & 0x1ff;
175 ptr = &root[index];
176
177 if (level == 0)
178 break;
179
180 if (*ptr == NULL) {
181 if (!alloc)
182 return NULL;
183
184 *ptr = (void *)get_zeroed_page(GFP_ATOMIC);
185 if (*ptr == NULL)
186 return NULL;
187 }
188
189 root = (struct pasid_state **)*ptr;
190 level -= 1;
191 }
192
193 return ptr;
194}
195
196static int set_pasid_state(struct device_state *dev_state,
197 struct pasid_state *pasid_state,
198 int pasid)
199{
200 struct pasid_state **ptr;
201 unsigned long flags;
202 int ret;
203
204 spin_lock_irqsave(&dev_state->lock, flags);
205 ptr = __get_pasid_state_ptr(dev_state, pasid, true);
206
207 ret = -ENOMEM;
208 if (ptr == NULL)
209 goto out_unlock;
210
211 ret = -ENOMEM;
212 if (*ptr != NULL)
213 goto out_unlock;
214
215 *ptr = pasid_state;
216
217 ret = 0;
218
219out_unlock:
220 spin_unlock_irqrestore(&dev_state->lock, flags);
221
222 return ret;
223}
224
225static void clear_pasid_state(struct device_state *dev_state, int pasid)
226{
227 struct pasid_state **ptr;
228 unsigned long flags;
229
230 spin_lock_irqsave(&dev_state->lock, flags);
231 ptr = __get_pasid_state_ptr(dev_state, pasid, true);
232
233 if (ptr == NULL)
234 goto out_unlock;
235
236 *ptr = NULL;
237
238out_unlock:
239 spin_unlock_irqrestore(&dev_state->lock, flags);
240}
241
242static struct pasid_state *get_pasid_state(struct device_state *dev_state,
243 int pasid)
244{
245 struct pasid_state **ptr, *ret = NULL;
246 unsigned long flags;
247
248 spin_lock_irqsave(&dev_state->lock, flags);
249 ptr = __get_pasid_state_ptr(dev_state, pasid, false);
250
251 if (ptr == NULL)
252 goto out_unlock;
253
254 ret = *ptr;
255 if (ret)
256 atomic_inc(&ret->count);
257
258out_unlock:
259 spin_unlock_irqrestore(&dev_state->lock, flags);
260
261 return ret;
262}
263
264static void free_pasid_state(struct pasid_state *pasid_state)
265{
266 kfree(pasid_state);
267}
268
269static void put_pasid_state(struct pasid_state *pasid_state)
270{
Oded Gabbay1c510992014-11-10 12:21:39 +0200271 if (atomic_dec_and_test(&pasid_state->count))
Joerg Roedel028eeac2011-11-24 12:48:13 +0100272 wake_up(&pasid_state->wq);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100273}
274
Joerg Roedel028eeac2011-11-24 12:48:13 +0100275static void put_pasid_state_wait(struct pasid_state *pasid_state)
276{
Oded Gabbay1bf1b432015-04-16 17:08:44 +0300277 atomic_dec(&pasid_state->count);
Joerg Roedela1bec062015-02-04 15:50:38 +0100278 wait_event(pasid_state->wq, !atomic_read(&pasid_state->count));
Joerg Roedel028eeac2011-11-24 12:48:13 +0100279 free_pasid_state(pasid_state);
280}
281
Joerg Roedel61feb432014-07-08 14:19:35 +0200282static void unbind_pasid(struct pasid_state *pasid_state)
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100283{
284 struct iommu_domain *domain;
285
286 domain = pasid_state->device_state->domain;
287
Joerg Roedel53d340e2014-07-08 15:01:43 +0200288 /*
289 * Mark pasid_state as invalid, no more faults will we added to the
290 * work queue after this is visible everywhere.
291 */
292 pasid_state->invalid = true;
293
294 /* Make sure this is visible */
295 smp_wmb();
296
297 /* After this the device/pasid can't access the mm anymore */
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100298 amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100299
300 /* Make sure no more pending faults are in the queue */
301 flush_workqueue(iommu_wq);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100302}
303
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100304static void free_pasid_states_level1(struct pasid_state **tbl)
305{
306 int i;
307
308 for (i = 0; i < 512; ++i) {
309 if (tbl[i] == NULL)
310 continue;
311
312 free_page((unsigned long)tbl[i]);
313 }
314}
315
316static void free_pasid_states_level2(struct pasid_state **tbl)
317{
318 struct pasid_state **ptr;
319 int i;
320
321 for (i = 0; i < 512; ++i) {
322 if (tbl[i] == NULL)
323 continue;
324
325 ptr = (struct pasid_state **)tbl[i];
326 free_pasid_states_level1(ptr);
327 }
328}
329
330static void free_pasid_states(struct device_state *dev_state)
331{
332 struct pasid_state *pasid_state;
333 int i;
334
335 for (i = 0; i < dev_state->max_pasids; ++i) {
336 pasid_state = get_pasid_state(dev_state, i);
337 if (pasid_state == NULL)
338 continue;
339
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100340 put_pasid_state(pasid_state);
Joerg Roedela40d4c62014-05-20 23:18:24 +0200341
342 /*
343 * This will call the mn_release function and
344 * unbind the PASID
345 */
346 mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
Joerg Roedelc5db16a2014-07-08 14:15:45 +0200347
348 put_pasid_state_wait(pasid_state); /* Reference taken in
Joerg Roedeldaff2f92014-07-30 16:04:40 +0200349 amd_iommu_bind_pasid */
Joerg Roedel75058a32014-07-30 16:04:39 +0200350
351 /* Drop reference taken in amd_iommu_bind_pasid */
352 put_device_state(dev_state);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100353 }
354
355 if (dev_state->pasid_levels == 2)
356 free_pasid_states_level2(dev_state->states);
357 else if (dev_state->pasid_levels == 1)
358 free_pasid_states_level1(dev_state->states);
359 else if (dev_state->pasid_levels != 0)
360 BUG();
361
362 free_page((unsigned long)dev_state->states);
363}
364
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100365static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
366{
367 return container_of(mn, struct pasid_state, mn);
368}
369
370static void __mn_flush_page(struct mmu_notifier *mn,
371 unsigned long address)
372{
373 struct pasid_state *pasid_state;
374 struct device_state *dev_state;
375
376 pasid_state = mn_to_state(mn);
377 dev_state = pasid_state->device_state;
378
379 amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, address);
380}
381
382static int mn_clear_flush_young(struct mmu_notifier *mn,
383 struct mm_struct *mm,
Andres Lagar-Cavilla57128462014-09-22 14:54:42 -0700384 unsigned long start,
385 unsigned long end)
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100386{
Andres Lagar-Cavilla57128462014-09-22 14:54:42 -0700387 for (; start < end; start += PAGE_SIZE)
388 __mn_flush_page(mn, start);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100389
390 return 0;
391}
392
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100393static void mn_invalidate_page(struct mmu_notifier *mn,
394 struct mm_struct *mm,
395 unsigned long address)
396{
397 __mn_flush_page(mn, address);
398}
399
Joerg Roedele7cc3dd2014-11-13 13:46:09 +1100400static void mn_invalidate_range(struct mmu_notifier *mn,
401 struct mm_struct *mm,
402 unsigned long start, unsigned long end)
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100403{
404 struct pasid_state *pasid_state;
405 struct device_state *dev_state;
406
407 pasid_state = mn_to_state(mn);
408 dev_state = pasid_state->device_state;
409
Joerg Roedele7cc3dd2014-11-13 13:46:09 +1100410 if ((start ^ (end - 1)) < PAGE_SIZE)
411 amd_iommu_flush_page(dev_state->domain, pasid_state->pasid,
412 start);
413 else
414 amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100415}
416
Joerg Roedela40d4c62014-05-20 23:18:24 +0200417static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
418{
419 struct pasid_state *pasid_state;
420 struct device_state *dev_state;
Joerg Roedeld9e16112014-07-09 15:43:11 +0200421 bool run_inv_ctx_cb;
Joerg Roedela40d4c62014-05-20 23:18:24 +0200422
423 might_sleep();
424
Joerg Roedeld9e16112014-07-09 15:43:11 +0200425 pasid_state = mn_to_state(mn);
426 dev_state = pasid_state->device_state;
427 run_inv_ctx_cb = !pasid_state->invalid;
Joerg Roedela40d4c62014-05-20 23:18:24 +0200428
Dan Carpenter940f7002015-02-20 13:52:01 +0300429 if (run_inv_ctx_cb && dev_state->inv_ctx_cb)
Joerg Roedela40d4c62014-05-20 23:18:24 +0200430 dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid);
431
Joerg Roedel61feb432014-07-08 14:19:35 +0200432 unbind_pasid(pasid_state);
Joerg Roedela40d4c62014-05-20 23:18:24 +0200433}
434
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100435static struct mmu_notifier_ops iommu_mn = {
Joerg Roedela40d4c62014-05-20 23:18:24 +0200436 .release = mn_release,
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100437 .clear_flush_young = mn_clear_flush_young,
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100438 .invalidate_page = mn_invalidate_page,
Joerg Roedele7cc3dd2014-11-13 13:46:09 +1100439 .invalidate_range = mn_invalidate_range,
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100440};
441
Joerg Roedel028eeac2011-11-24 12:48:13 +0100442static void set_pri_tag_status(struct pasid_state *pasid_state,
443 u16 tag, int status)
444{
445 unsigned long flags;
446
447 spin_lock_irqsave(&pasid_state->lock, flags);
448 pasid_state->pri[tag].status = status;
449 spin_unlock_irqrestore(&pasid_state->lock, flags);
450}
451
452static void finish_pri_tag(struct device_state *dev_state,
453 struct pasid_state *pasid_state,
454 u16 tag)
455{
456 unsigned long flags;
457
458 spin_lock_irqsave(&pasid_state->lock, flags);
459 if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) &&
460 pasid_state->pri[tag].finish) {
461 amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid,
462 pasid_state->pri[tag].status, tag);
463 pasid_state->pri[tag].finish = false;
464 pasid_state->pri[tag].status = PPR_SUCCESS;
465 }
466 spin_unlock_irqrestore(&pasid_state->lock, flags);
467}
468
Jesse Barnes9dc00f42014-12-12 16:55:30 -0800469static void handle_fault_error(struct fault *fault)
470{
471 int status;
472
473 if (!fault->dev_state->inv_ppr_cb) {
474 set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
475 return;
476 }
477
478 status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev,
479 fault->pasid,
480 fault->address,
481 fault->flags);
482 switch (status) {
483 case AMD_IOMMU_INV_PRI_RSP_SUCCESS:
484 set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS);
485 break;
486 case AMD_IOMMU_INV_PRI_RSP_INVALID:
487 set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
488 break;
489 case AMD_IOMMU_INV_PRI_RSP_FAIL:
490 set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE);
491 break;
492 default:
493 BUG();
494 }
495}
496
Joerg Roedel028eeac2011-11-24 12:48:13 +0100497static void do_fault(struct work_struct *work)
498{
499 struct fault *fault = container_of(work, struct fault, work);
Jesse Barnes9dc00f42014-12-12 16:55:30 -0800500 struct mm_struct *mm;
501 struct vm_area_struct *vma;
502 u64 address;
503 int ret, write;
Joerg Roedel028eeac2011-11-24 12:48:13 +0100504
505 write = !!(fault->flags & PPR_FAULT_WRITE);
506
Jesse Barnes9dc00f42014-12-12 16:55:30 -0800507 mm = fault->state->mm;
508 address = fault->address;
Joerg Roedel028eeac2011-11-24 12:48:13 +0100509
Jesse Barnes9dc00f42014-12-12 16:55:30 -0800510 down_read(&mm->mmap_sem);
511 vma = find_extend_vma(mm, address);
512 if (!vma || address < vma->vm_start) {
513 /* failed to get a vma in the right range */
514 up_read(&mm->mmap_sem);
515 handle_fault_error(fault);
516 goto out;
Joerg Roedel175d6142011-11-28 14:36:36 +0100517 }
Joerg Roedel028eeac2011-11-24 12:48:13 +0100518
Jesse Barnes9dc00f42014-12-12 16:55:30 -0800519 ret = handle_mm_fault(mm, vma, address, write);
520 if (ret & VM_FAULT_ERROR) {
521 /* failed to service fault */
522 up_read(&mm->mmap_sem);
523 handle_fault_error(fault);
524 goto out;
525 }
526
527 up_read(&mm->mmap_sem);
528
529out:
Joerg Roedel028eeac2011-11-24 12:48:13 +0100530 finish_pri_tag(fault->dev_state, fault->state, fault->tag);
531
532 put_pasid_state(fault->state);
533
534 kfree(fault);
535}
536
537static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
538{
539 struct amd_iommu_fault *iommu_fault;
540 struct pasid_state *pasid_state;
541 struct device_state *dev_state;
542 unsigned long flags;
543 struct fault *fault;
544 bool finish;
545 u16 tag;
546 int ret;
547
548 iommu_fault = data;
549 tag = iommu_fault->tag & 0x1ff;
550 finish = (iommu_fault->tag >> 9) & 1;
551
552 ret = NOTIFY_DONE;
553 dev_state = get_device_state(iommu_fault->device_id);
554 if (dev_state == NULL)
555 goto out;
556
557 pasid_state = get_pasid_state(dev_state, iommu_fault->pasid);
Joerg Roedel53d340e2014-07-08 15:01:43 +0200558 if (pasid_state == NULL || pasid_state->invalid) {
Joerg Roedel028eeac2011-11-24 12:48:13 +0100559 /* We know the device but not the PASID -> send INVALID */
560 amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid,
561 PPR_INVALID, tag);
562 goto out_drop_state;
563 }
564
565 spin_lock_irqsave(&pasid_state->lock, flags);
566 atomic_inc(&pasid_state->pri[tag].inflight);
567 if (finish)
568 pasid_state->pri[tag].finish = true;
569 spin_unlock_irqrestore(&pasid_state->lock, flags);
570
571 fault = kzalloc(sizeof(*fault), GFP_ATOMIC);
572 if (fault == NULL) {
573 /* We are OOM - send success and let the device re-fault */
574 finish_pri_tag(dev_state, pasid_state, tag);
575 goto out_drop_state;
576 }
577
578 fault->dev_state = dev_state;
579 fault->address = iommu_fault->address;
580 fault->state = pasid_state;
581 fault->tag = tag;
582 fault->finish = finish;
Alexey Skidanovb00675b2014-07-08 17:30:16 +0300583 fault->pasid = iommu_fault->pasid;
Joerg Roedel028eeac2011-11-24 12:48:13 +0100584 fault->flags = iommu_fault->flags;
585 INIT_WORK(&fault->work, do_fault);
586
587 queue_work(iommu_wq, &fault->work);
588
589 ret = NOTIFY_OK;
590
591out_drop_state:
Joerg Roedeldc88db72014-07-08 14:55:10 +0200592
593 if (ret != NOTIFY_OK && pasid_state)
594 put_pasid_state(pasid_state);
595
Joerg Roedel028eeac2011-11-24 12:48:13 +0100596 put_device_state(dev_state);
597
598out:
599 return ret;
600}
601
602static struct notifier_block ppr_nb = {
603 .notifier_call = ppr_notifier,
604};
605
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100606int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
607 struct task_struct *task)
608{
609 struct pasid_state *pasid_state;
610 struct device_state *dev_state;
Joerg Roedelf0aac632014-07-08 15:15:07 +0200611 struct mm_struct *mm;
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100612 u16 devid;
613 int ret;
614
615 might_sleep();
616
617 if (!amd_iommu_v2_supported())
618 return -ENODEV;
619
620 devid = device_id(pdev);
621 dev_state = get_device_state(devid);
622
623 if (dev_state == NULL)
624 return -EINVAL;
625
626 ret = -EINVAL;
627 if (pasid < 0 || pasid >= dev_state->max_pasids)
628 goto out;
629
630 ret = -ENOMEM;
631 pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
632 if (pasid_state == NULL)
633 goto out;
634
Joerg Roedelf0aac632014-07-08 15:15:07 +0200635
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100636 atomic_set(&pasid_state->count, 1);
Joerg Roedel028eeac2011-11-24 12:48:13 +0100637 init_waitqueue_head(&pasid_state->wq);
Joerg Roedel2c13d472012-07-19 10:56:10 +0200638 spin_lock_init(&pasid_state->lock);
639
Joerg Roedelf0aac632014-07-08 15:15:07 +0200640 mm = get_task_mm(task);
Joerg Roedelf0aac632014-07-08 15:15:07 +0200641 pasid_state->mm = mm;
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100642 pasid_state->device_state = dev_state;
643 pasid_state->pasid = pasid;
Joerg Roedeld9e16112014-07-09 15:43:11 +0200644 pasid_state->invalid = true; /* Mark as valid only if we are
645 done with setting up the pasid */
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100646 pasid_state->mn.ops = &iommu_mn;
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100647
648 if (pasid_state->mm == NULL)
649 goto out_free;
650
Joerg Roedelf0aac632014-07-08 15:15:07 +0200651 mmu_notifier_register(&pasid_state->mn, mm);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100652
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100653 ret = set_pasid_state(dev_state, pasid_state, pasid);
654 if (ret)
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100655 goto out_unregister;
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100656
657 ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
658 __pa(pasid_state->mm->pgd));
659 if (ret)
660 goto out_clear_state;
661
Joerg Roedeld9e16112014-07-09 15:43:11 +0200662 /* Now we are ready to handle faults */
663 pasid_state->invalid = false;
664
Joerg Roedelf0aac632014-07-08 15:15:07 +0200665 /*
666 * Drop the reference to the mm_struct here. We rely on the
667 * mmu_notifier release call-back to inform us when the mm
668 * is going away.
669 */
670 mmput(mm);
671
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100672 return 0;
673
674out_clear_state:
675 clear_pasid_state(dev_state, pasid);
676
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100677out_unregister:
Joerg Roedelf0aac632014-07-08 15:15:07 +0200678 mmu_notifier_unregister(&pasid_state->mn, mm);
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100679
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100680out_free:
Joerg Roedelf0aac632014-07-08 15:15:07 +0200681 mmput(mm);
Joerg Roedel028eeac2011-11-24 12:48:13 +0100682 free_pasid_state(pasid_state);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100683
684out:
685 put_device_state(dev_state);
686
687 return ret;
688}
689EXPORT_SYMBOL(amd_iommu_bind_pasid);
690
691void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
692{
Joerg Roedela40d4c62014-05-20 23:18:24 +0200693 struct pasid_state *pasid_state;
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100694 struct device_state *dev_state;
695 u16 devid;
696
697 might_sleep();
698
699 if (!amd_iommu_v2_supported())
700 return;
701
702 devid = device_id(pdev);
703 dev_state = get_device_state(devid);
704 if (dev_state == NULL)
705 return;
706
707 if (pasid < 0 || pasid >= dev_state->max_pasids)
708 goto out;
709
Joerg Roedela40d4c62014-05-20 23:18:24 +0200710 pasid_state = get_pasid_state(dev_state, pasid);
711 if (pasid_state == NULL)
712 goto out;
713 /*
714 * Drop reference taken here. We are safe because we still hold
715 * the reference taken in the amd_iommu_bind_pasid function.
716 */
717 put_pasid_state(pasid_state);
718
Joerg Roedel53d340e2014-07-08 15:01:43 +0200719 /* Clear the pasid state so that the pasid can be re-used */
720 clear_pasid_state(dev_state, pasid_state->pasid);
721
Joerg Roedelf0aac632014-07-08 15:15:07 +0200722 /*
Joerg Roedelfcaa9602014-07-30 16:04:37 +0200723 * Call mmu_notifier_unregister to drop our reference
724 * to pasid_state->mm
Joerg Roedelf0aac632014-07-08 15:15:07 +0200725 */
Joerg Roedelfcaa9602014-07-30 16:04:37 +0200726 mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100727
Joerg Roedelc5db16a2014-07-08 14:15:45 +0200728 put_pasid_state_wait(pasid_state); /* Reference taken in
Joerg Roedeldaff2f92014-07-30 16:04:40 +0200729 amd_iommu_bind_pasid */
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100730out:
Joerg Roedel75058a32014-07-30 16:04:39 +0200731 /* Drop reference taken in this function */
732 put_device_state(dev_state);
733
734 /* Drop reference taken in amd_iommu_bind_pasid */
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100735 put_device_state(dev_state);
736}
737EXPORT_SYMBOL(amd_iommu_unbind_pasid);
738
Joerg Roedeled96f222011-11-23 17:30:39 +0100739int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
740{
741 struct device_state *dev_state;
Joerg Roedel55c99a42015-07-28 16:58:47 +0200742 struct iommu_group *group;
Joerg Roedeled96f222011-11-23 17:30:39 +0100743 unsigned long flags;
744 int ret, tmp;
745 u16 devid;
746
747 might_sleep();
748
749 if (!amd_iommu_v2_supported())
750 return -ENODEV;
751
752 if (pasids <= 0 || pasids > (PASID_MASK + 1))
753 return -EINVAL;
754
755 devid = device_id(pdev);
756
757 dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL);
758 if (dev_state == NULL)
759 return -ENOMEM;
760
761 spin_lock_init(&dev_state->lock);
Joerg Roedel028eeac2011-11-24 12:48:13 +0100762 init_waitqueue_head(&dev_state->wq);
Joerg Roedel741669c2014-05-20 23:18:23 +0200763 dev_state->pdev = pdev;
764 dev_state->devid = devid;
Joerg Roedeled96f222011-11-23 17:30:39 +0100765
766 tmp = pasids;
767 for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9)
768 dev_state->pasid_levels += 1;
769
770 atomic_set(&dev_state->count, 1);
771 dev_state->max_pasids = pasids;
772
773 ret = -ENOMEM;
774 dev_state->states = (void *)get_zeroed_page(GFP_KERNEL);
775 if (dev_state->states == NULL)
776 goto out_free_dev_state;
777
778 dev_state->domain = iommu_domain_alloc(&pci_bus_type);
779 if (dev_state->domain == NULL)
780 goto out_free_states;
781
782 amd_iommu_domain_direct_map(dev_state->domain);
783
784 ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids);
785 if (ret)
786 goto out_free_domain;
787
Joerg Roedel55c99a42015-07-28 16:58:47 +0200788 group = iommu_group_get(&pdev->dev);
789 if (!group)
Joerg Roedeled96f222011-11-23 17:30:39 +0100790 goto out_free_domain;
791
Joerg Roedel55c99a42015-07-28 16:58:47 +0200792 ret = iommu_attach_group(dev_state->domain, group);
793 if (ret != 0)
794 goto out_drop_group;
795
796 iommu_group_put(group);
797
Joerg Roedeled96f222011-11-23 17:30:39 +0100798 spin_lock_irqsave(&state_lock, flags);
799
Joerg Roedel741669c2014-05-20 23:18:23 +0200800 if (__get_device_state(devid) != NULL) {
Joerg Roedeled96f222011-11-23 17:30:39 +0100801 spin_unlock_irqrestore(&state_lock, flags);
802 ret = -EBUSY;
803 goto out_free_domain;
804 }
805
Joerg Roedel741669c2014-05-20 23:18:23 +0200806 list_add_tail(&dev_state->list, &state_list);
Joerg Roedeled96f222011-11-23 17:30:39 +0100807
808 spin_unlock_irqrestore(&state_lock, flags);
809
810 return 0;
811
Joerg Roedel55c99a42015-07-28 16:58:47 +0200812out_drop_group:
813 iommu_group_put(group);
814
Joerg Roedeled96f222011-11-23 17:30:39 +0100815out_free_domain:
816 iommu_domain_free(dev_state->domain);
817
818out_free_states:
819 free_page((unsigned long)dev_state->states);
820
821out_free_dev_state:
822 kfree(dev_state);
823
824 return ret;
825}
826EXPORT_SYMBOL(amd_iommu_init_device);
827
828void amd_iommu_free_device(struct pci_dev *pdev)
829{
830 struct device_state *dev_state;
831 unsigned long flags;
832 u16 devid;
833
834 if (!amd_iommu_v2_supported())
835 return;
836
837 devid = device_id(pdev);
838
839 spin_lock_irqsave(&state_lock, flags);
840
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200841 dev_state = __get_device_state(devid);
Joerg Roedeled96f222011-11-23 17:30:39 +0100842 if (dev_state == NULL) {
843 spin_unlock_irqrestore(&state_lock, flags);
844 return;
845 }
846
Joerg Roedel741669c2014-05-20 23:18:23 +0200847 list_del(&dev_state->list);
Joerg Roedeled96f222011-11-23 17:30:39 +0100848
849 spin_unlock_irqrestore(&state_lock, flags);
850
Joerg Roedel2d5503b2011-11-24 10:41:57 +0100851 /* Get rid of any remaining pasid states */
852 free_pasid_states(dev_state);
853
Peter Zijlstra91f65fa2015-02-03 13:25:51 +0100854 put_device_state(dev_state);
855 /*
856 * Wait until the last reference is dropped before freeing
857 * the device state.
858 */
859 wait_event(dev_state->wq, !atomic_read(&dev_state->count));
860 free_device_state(dev_state);
Joerg Roedeled96f222011-11-23 17:30:39 +0100861}
862EXPORT_SYMBOL(amd_iommu_free_device);
863
Joerg Roedel175d6142011-11-28 14:36:36 +0100864int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
865 amd_iommu_invalid_ppr_cb cb)
866{
867 struct device_state *dev_state;
868 unsigned long flags;
869 u16 devid;
870 int ret;
871
872 if (!amd_iommu_v2_supported())
873 return -ENODEV;
874
875 devid = device_id(pdev);
876
877 spin_lock_irqsave(&state_lock, flags);
878
879 ret = -EINVAL;
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200880 dev_state = __get_device_state(devid);
Joerg Roedel175d6142011-11-28 14:36:36 +0100881 if (dev_state == NULL)
882 goto out_unlock;
883
884 dev_state->inv_ppr_cb = cb;
885
886 ret = 0;
887
888out_unlock:
889 spin_unlock_irqrestore(&state_lock, flags);
890
891 return ret;
892}
893EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
894
Joerg Roedelbc216622011-12-07 12:24:42 +0100895int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
896 amd_iommu_invalidate_ctx cb)
897{
898 struct device_state *dev_state;
899 unsigned long flags;
900 u16 devid;
901 int ret;
902
903 if (!amd_iommu_v2_supported())
904 return -ENODEV;
905
906 devid = device_id(pdev);
907
908 spin_lock_irqsave(&state_lock, flags);
909
910 ret = -EINVAL;
Joerg Roedelb87d2d72014-05-20 23:18:22 +0200911 dev_state = __get_device_state(devid);
Joerg Roedelbc216622011-12-07 12:24:42 +0100912 if (dev_state == NULL)
913 goto out_unlock;
914
915 dev_state->inv_ctx_cb = cb;
916
917 ret = 0;
918
919out_unlock:
920 spin_unlock_irqrestore(&state_lock, flags);
921
922 return ret;
923}
924EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
925
Joerg Roedele3c495c2011-11-09 12:31:15 +0100926static int __init amd_iommu_v2_init(void)
927{
Joerg Roedel028eeac2011-11-24 12:48:13 +0100928 int ret;
Joerg Roedeled96f222011-11-23 17:30:39 +0100929
Joerg Roedel63ce3ae2015-02-04 16:12:55 +0100930 pr_info("AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>\n");
Joerg Roedel474d567d2012-03-15 12:46:40 +0100931
932 if (!amd_iommu_v2_supported()) {
Masanari Iida07db0402012-07-22 02:21:32 +0900933 pr_info("AMD IOMMUv2 functionality not available on this system\n");
Joerg Roedel474d567d2012-03-15 12:46:40 +0100934 /*
935 * Load anyway to provide the symbols to other modules
936 * which may use AMD IOMMUv2 optionally.
937 */
938 return 0;
939 }
Joerg Roedele3c495c2011-11-09 12:31:15 +0100940
Joerg Roedeled96f222011-11-23 17:30:39 +0100941 spin_lock_init(&state_lock);
942
Joerg Roedel028eeac2011-11-24 12:48:13 +0100943 ret = -ENOMEM;
944 iommu_wq = create_workqueue("amd_iommu_v2");
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100945 if (iommu_wq == NULL)
Joerg Roedel741669c2014-05-20 23:18:23 +0200946 goto out;
Joerg Roedel8736b2c2011-11-24 16:21:52 +0100947
Joerg Roedel028eeac2011-11-24 12:48:13 +0100948 amd_iommu_register_ppr_notifier(&ppr_nb);
949
Joerg Roedele3c495c2011-11-09 12:31:15 +0100950 return 0;
Joerg Roedel028eeac2011-11-24 12:48:13 +0100951
Joerg Roedel741669c2014-05-20 23:18:23 +0200952out:
Joerg Roedel028eeac2011-11-24 12:48:13 +0100953 return ret;
Joerg Roedele3c495c2011-11-09 12:31:15 +0100954}
955
956static void __exit amd_iommu_v2_exit(void)
957{
Joerg Roedeled96f222011-11-23 17:30:39 +0100958 struct device_state *dev_state;
Joerg Roedeled96f222011-11-23 17:30:39 +0100959 int i;
960
Joerg Roedel474d567d2012-03-15 12:46:40 +0100961 if (!amd_iommu_v2_supported())
962 return;
963
Joerg Roedel028eeac2011-11-24 12:48:13 +0100964 amd_iommu_unregister_ppr_notifier(&ppr_nb);
965
966 flush_workqueue(iommu_wq);
967
968 /*
969 * The loop below might call flush_workqueue(), so call
970 * destroy_workqueue() after it
971 */
Joerg Roedeled96f222011-11-23 17:30:39 +0100972 for (i = 0; i < MAX_DEVICES; ++i) {
973 dev_state = get_device_state(i);
974
975 if (dev_state == NULL)
976 continue;
977
978 WARN_ON_ONCE(1);
979
Joerg Roedeled96f222011-11-23 17:30:39 +0100980 put_device_state(dev_state);
Joerg Roedel028eeac2011-11-24 12:48:13 +0100981 amd_iommu_free_device(dev_state->pdev);
Joerg Roedeled96f222011-11-23 17:30:39 +0100982 }
983
Joerg Roedel028eeac2011-11-24 12:48:13 +0100984 destroy_workqueue(iommu_wq);
Joerg Roedele3c495c2011-11-09 12:31:15 +0100985}
986
987module_init(amd_iommu_v2_init);
988module_exit(amd_iommu_v2_exit);