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1/*
2 * Copyright 2017 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23#include "amdgpu_ids.h"
24
25#include <linux/idr.h>
26#include <linux/dma-fence-array.h>
27
28
29#include "amdgpu.h"
30#include "amdgpu_trace.h"
31
32/*
33 * PASID manager
34 *
35 * PASIDs are global address space identifiers that can be shared
36 * between the GPU, an IOMMU and the driver. VMs on different devices
37 * may use the same PASID if they share the same address
38 * space. Therefore PASIDs are allocated using a global IDA. VMs are
39 * looked up from the PASID per amdgpu_device.
40 */
41static DEFINE_IDA(amdgpu_pasid_ida);
42
43/* Helper to free pasid from a fence callback */
44struct amdgpu_pasid_cb {
45 struct dma_fence_cb cb;
46 u32 pasid;
47};
48
49/**
50 * amdgpu_pasid_alloc - Allocate a PASID
51 * @bits: Maximum width of the PASID in bits, must be at least 1
52 *
53 * Allocates a PASID of the given width while keeping smaller PASIDs
54 * available if possible.
55 *
56 * Returns a positive integer on success. Returns %-EINVAL if bits==0.
57 * Returns %-ENOSPC if no PASID was available. Returns %-ENOMEM on
58 * memory allocation failure.
59 */
60int amdgpu_pasid_alloc(unsigned int bits)
61{
62 int pasid = -EINVAL;
63
64 for (bits = min(bits, 31U); bits > 0; bits--) {
65 pasid = ida_simple_get(&amdgpu_pasid_ida,
66 1U << (bits - 1), 1U << bits,
67 GFP_KERNEL);
68 if (pasid != -ENOSPC)
69 break;
70 }
71
72 if (pasid >= 0)
73 trace_amdgpu_pasid_allocated(pasid);
74
75 return pasid;
76}
77
78/**
79 * amdgpu_pasid_free - Free a PASID
80 * @pasid: PASID to free
81 */
82void amdgpu_pasid_free(u32 pasid)
83{
84 trace_amdgpu_pasid_freed(pasid);
85 ida_simple_remove(&amdgpu_pasid_ida, pasid);
86}
87
88static void amdgpu_pasid_free_cb(struct dma_fence *fence,
89 struct dma_fence_cb *_cb)
90{
91 struct amdgpu_pasid_cb *cb =
92 container_of(_cb, struct amdgpu_pasid_cb, cb);
93
94 amdgpu_pasid_free(cb->pasid);
95 dma_fence_put(fence);
96 kfree(cb);
97}
98
99/**
100 * amdgpu_pasid_free_delayed - free pasid when fences signal
101 *
102 * @resv: reservation object with the fences to wait for
103 * @pasid: pasid to free
104 *
105 * Free the pasid only after all the fences in resv are signaled.
106 */
107void amdgpu_pasid_free_delayed(struct dma_resv *resv,
108 u32 pasid)
109{
110 struct dma_fence *fence, **fences;
111 struct amdgpu_pasid_cb *cb;
112 unsigned count;
113 int r;
114
115 r = dma_resv_get_fences(resv, NULL, &count, &fences);
116 if (r)
117 goto fallback;
118
119 if (count == 0) {
120 amdgpu_pasid_free(pasid);
121 return;
122 }
123
124 if (count == 1) {
125 fence = fences[0];
126 kfree(fences);
127 } else {
128 uint64_t context = dma_fence_context_alloc(1);
129 struct dma_fence_array *array;
130
131 array = dma_fence_array_create(count, fences, context,
132 1, false);
133 if (!array) {
134 kfree(fences);
135 goto fallback;
136 }
137 fence = &array->base;
138 }
139
140 cb = kmalloc(sizeof(*cb), GFP_KERNEL);
141 if (!cb) {
142 /* Last resort when we are OOM */
143 dma_fence_wait(fence, false);
144 dma_fence_put(fence);
145 amdgpu_pasid_free(pasid);
146 } else {
147 cb->pasid = pasid;
148 if (dma_fence_add_callback(fence, &cb->cb,
149 amdgpu_pasid_free_cb))
150 amdgpu_pasid_free_cb(fence, &cb->cb);
151 }
152
153 return;
154
155fallback:
156 /* Not enough memory for the delayed delete, as last resort
157 * block for all the fences to complete.
158 */
159 dma_resv_wait_timeout(resv, true, false, MAX_SCHEDULE_TIMEOUT);
160 amdgpu_pasid_free(pasid);
161}
162
163/*
164 * VMID manager
165 *
166 * VMIDs are a per VMHUB identifier for page tables handling.
167 */
168
169/**
170 * amdgpu_vmid_had_gpu_reset - check if reset occured since last use
171 *
172 * @adev: amdgpu_device pointer
173 * @id: VMID structure
174 *
175 * Check if GPU reset occured since last use of the VMID.
176 */
177bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
178 struct amdgpu_vmid *id)
179{
180 return id->current_gpu_reset_count !=
181 atomic_read(&adev->gpu_reset_counter);
182}
183
184/**
185 * amdgpu_vmid_grab_idle - grab idle VMID
186 *
187 * @vm: vm to allocate id for
188 * @ring: ring we want to submit job to
189 * @sync: sync object where we add dependencies
190 * @idle: resulting idle VMID
191 *
192 * Try to find an idle VMID, if none is idle add a fence to wait to the sync
193 * object. Returns -ENOMEM when we are out of memory.
194 */
195static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
196 struct amdgpu_ring *ring,
197 struct amdgpu_sync *sync,
198 struct amdgpu_vmid **idle)
199{
200 struct amdgpu_device *adev = ring->adev;
201 unsigned vmhub = ring->funcs->vmhub;
202 struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
203 struct dma_fence **fences;
204 unsigned i;
205 int r;
206
207 if (ring->vmid_wait && !dma_fence_is_signaled(ring->vmid_wait))
208 return amdgpu_sync_fence(sync, ring->vmid_wait);
209
210 fences = kmalloc_array(id_mgr->num_ids, sizeof(void *), GFP_KERNEL);
211 if (!fences)
212 return -ENOMEM;
213
214 /* Check if we have an idle VMID */
215 i = 0;
216 list_for_each_entry((*idle), &id_mgr->ids_lru, list) {
217 /* Don't use per engine and per process VMID at the same time */
218 struct amdgpu_ring *r = adev->vm_manager.concurrent_flush ?
219 NULL : ring;
220
221 fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, r);
222 if (!fences[i])
223 break;
224 ++i;
225 }
226
227 /* If we can't find a idle VMID to use, wait till one becomes available */
228 if (&(*idle)->list == &id_mgr->ids_lru) {
229 u64 fence_context = adev->vm_manager.fence_context + ring->idx;
230 unsigned seqno = ++adev->vm_manager.seqno[ring->idx];
231 struct dma_fence_array *array;
232 unsigned j;
233
234 *idle = NULL;
235 for (j = 0; j < i; ++j)
236 dma_fence_get(fences[j]);
237
238 array = dma_fence_array_create(i, fences, fence_context,
239 seqno, true);
240 if (!array) {
241 for (j = 0; j < i; ++j)
242 dma_fence_put(fences[j]);
243 kfree(fences);
244 return -ENOMEM;
245 }
246
247 r = amdgpu_sync_fence(sync, &array->base);
248 dma_fence_put(ring->vmid_wait);
249 ring->vmid_wait = &array->base;
250 return r;
251 }
252 kfree(fences);
253
254 return 0;
255}
256
257/**
258 * amdgpu_vmid_grab_reserved - try to assign reserved VMID
259 *
260 * @vm: vm to allocate id for
261 * @ring: ring we want to submit job to
262 * @sync: sync object where we add dependencies
263 * @fence: fence protecting ID from reuse
264 * @job: job who wants to use the VMID
265 * @id: resulting VMID
266 *
267 * Try to assign a reserved VMID.
268 */
269static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
270 struct amdgpu_ring *ring,
271 struct amdgpu_sync *sync,
272 struct dma_fence *fence,
273 struct amdgpu_job *job,
274 struct amdgpu_vmid **id)
275{
276 struct amdgpu_device *adev = ring->adev;
277 unsigned vmhub = ring->funcs->vmhub;
278 uint64_t fence_context = adev->fence_context + ring->idx;
279 struct dma_fence *updates = sync->last_vm_update;
280 bool needs_flush = vm->use_cpu_for_update;
281 int r = 0;
282
283 *id = vm->reserved_vmid[vmhub];
284 if (updates && (*id)->flushed_updates &&
285 updates->context == (*id)->flushed_updates->context &&
286 !dma_fence_is_later(updates, (*id)->flushed_updates))
287 updates = NULL;
288
289 if ((*id)->owner != vm->immediate.fence_context ||
290 job->vm_pd_addr != (*id)->pd_gpu_addr ||
291 updates || !(*id)->last_flush ||
292 ((*id)->last_flush->context != fence_context &&
293 !dma_fence_is_signaled((*id)->last_flush))) {
294 struct dma_fence *tmp;
295
296 /* Don't use per engine and per process VMID at the same time */
297 if (adev->vm_manager.concurrent_flush)
298 ring = NULL;
299
300 /* to prevent one context starved by another context */
301 (*id)->pd_gpu_addr = 0;
302 tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
303 if (tmp) {
304 *id = NULL;
305 r = amdgpu_sync_fence(sync, tmp);
306 return r;
307 }
308 needs_flush = true;
309 }
310
311 /* Good we can use this VMID. Remember this submission as
312 * user of the VMID.
313 */
314 r = amdgpu_sync_fence(&(*id)->active, fence);
315 if (r)
316 return r;
317
318 if (updates) {
319 dma_fence_put((*id)->flushed_updates);
320 (*id)->flushed_updates = dma_fence_get(updates);
321 }
322 job->vm_needs_flush = needs_flush;
323 return 0;
324}
325
326/**
327 * amdgpu_vmid_grab_used - try to reuse a VMID
328 *
329 * @vm: vm to allocate id for
330 * @ring: ring we want to submit job to
331 * @sync: sync object where we add dependencies
332 * @fence: fence protecting ID from reuse
333 * @job: job who wants to use the VMID
334 * @id: resulting VMID
335 *
336 * Try to reuse a VMID for this submission.
337 */
338static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
339 struct amdgpu_ring *ring,
340 struct amdgpu_sync *sync,
341 struct dma_fence *fence,
342 struct amdgpu_job *job,
343 struct amdgpu_vmid **id)
344{
345 struct amdgpu_device *adev = ring->adev;
346 unsigned vmhub = ring->funcs->vmhub;
347 struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
348 uint64_t fence_context = adev->fence_context + ring->idx;
349 struct dma_fence *updates = sync->last_vm_update;
350 int r;
351
352 job->vm_needs_flush = vm->use_cpu_for_update;
353
354 /* Check if we can use a VMID already assigned to this VM */
355 list_for_each_entry_reverse((*id), &id_mgr->ids_lru, list) {
356 bool needs_flush = vm->use_cpu_for_update;
357 struct dma_fence *flushed;
358
359 /* Check all the prerequisites to using this VMID */
360 if ((*id)->owner != vm->immediate.fence_context)
361 continue;
362
363 if ((*id)->pd_gpu_addr != job->vm_pd_addr)
364 continue;
365
366 if (!(*id)->last_flush ||
367 ((*id)->last_flush->context != fence_context &&
368 !dma_fence_is_signaled((*id)->last_flush)))
369 needs_flush = true;
370
371 flushed = (*id)->flushed_updates;
372 if (updates && (!flushed || dma_fence_is_later(updates, flushed)))
373 needs_flush = true;
374
375 if (needs_flush && !adev->vm_manager.concurrent_flush)
376 continue;
377
378 /* Good, we can use this VMID. Remember this submission as
379 * user of the VMID.
380 */
381 r = amdgpu_sync_fence(&(*id)->active, fence);
382 if (r)
383 return r;
384
385 if (updates && (!flushed || dma_fence_is_later(updates, flushed))) {
386 dma_fence_put((*id)->flushed_updates);
387 (*id)->flushed_updates = dma_fence_get(updates);
388 }
389
390 job->vm_needs_flush |= needs_flush;
391 return 0;
392 }
393
394 *id = NULL;
395 return 0;
396}
397
398/**
399 * amdgpu_vmid_grab - allocate the next free VMID
400 *
401 * @vm: vm to allocate id for
402 * @ring: ring we want to submit job to
403 * @sync: sync object where we add dependencies
404 * @fence: fence protecting ID from reuse
405 * @job: job who wants to use the VMID
406 *
407 * Allocate an id for the vm, adding fences to the sync obj as necessary.
408 */
409int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
410 struct amdgpu_sync *sync, struct dma_fence *fence,
411 struct amdgpu_job *job)
412{
413 struct amdgpu_device *adev = ring->adev;
414 unsigned vmhub = ring->funcs->vmhub;
415 struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
416 struct amdgpu_vmid *idle = NULL;
417 struct amdgpu_vmid *id = NULL;
418 int r = 0;
419
420 mutex_lock(&id_mgr->lock);
421 r = amdgpu_vmid_grab_idle(vm, ring, sync, &idle);
422 if (r || !idle)
423 goto error;
424
425 if (vm->reserved_vmid[vmhub]) {
426 r = amdgpu_vmid_grab_reserved(vm, ring, sync, fence, job, &id);
427 if (r || !id)
428 goto error;
429 } else {
430 r = amdgpu_vmid_grab_used(vm, ring, sync, fence, job, &id);
431 if (r)
432 goto error;
433
434 if (!id) {
435 struct dma_fence *updates = sync->last_vm_update;
436
437 /* Still no ID to use? Then use the idle one found earlier */
438 id = idle;
439
440 /* Remember this submission as user of the VMID */
441 r = amdgpu_sync_fence(&id->active, fence);
442 if (r)
443 goto error;
444
445 dma_fence_put(id->flushed_updates);
446 id->flushed_updates = dma_fence_get(updates);
447 job->vm_needs_flush = true;
448 }
449
450 list_move_tail(&id->list, &id_mgr->ids_lru);
451 }
452
453 id->pd_gpu_addr = job->vm_pd_addr;
454 id->owner = vm->immediate.fence_context;
455
456 if (job->vm_needs_flush) {
457 dma_fence_put(id->last_flush);
458 id->last_flush = NULL;
459 }
460 job->vmid = id - id_mgr->ids;
461 job->pasid = vm->pasid;
462 trace_amdgpu_vm_grab_id(vm, ring, job);
463
464error:
465 mutex_unlock(&id_mgr->lock);
466 return r;
467}
468
469int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
470 struct amdgpu_vm *vm,
471 unsigned vmhub)
472{
473 struct amdgpu_vmid_mgr *id_mgr;
474 struct amdgpu_vmid *idle;
475 int r = 0;
476
477 id_mgr = &adev->vm_manager.id_mgr[vmhub];
478 mutex_lock(&id_mgr->lock);
479 if (vm->reserved_vmid[vmhub])
480 goto unlock;
481 if (atomic_inc_return(&id_mgr->reserved_vmid_num) >
482 AMDGPU_VM_MAX_RESERVED_VMID) {
483 DRM_ERROR("Over limitation of reserved vmid\n");
484 atomic_dec(&id_mgr->reserved_vmid_num);
485 r = -EINVAL;
486 goto unlock;
487 }
488 /* Select the first entry VMID */
489 idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vmid, list);
490 list_del_init(&idle->list);
491 vm->reserved_vmid[vmhub] = idle;
492 mutex_unlock(&id_mgr->lock);
493
494 return 0;
495unlock:
496 mutex_unlock(&id_mgr->lock);
497 return r;
498}
499
500void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
501 struct amdgpu_vm *vm,
502 unsigned vmhub)
503{
504 struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
505
506 mutex_lock(&id_mgr->lock);
507 if (vm->reserved_vmid[vmhub]) {
508 list_add(&vm->reserved_vmid[vmhub]->list,
509 &id_mgr->ids_lru);
510 vm->reserved_vmid[vmhub] = NULL;
511 atomic_dec(&id_mgr->reserved_vmid_num);
512 }
513 mutex_unlock(&id_mgr->lock);
514}
515
516/**
517 * amdgpu_vmid_reset - reset VMID to zero
518 *
519 * @adev: amdgpu device structure
520 * @vmhub: vmhub type
521 * @vmid: vmid number to use
522 *
523 * Reset saved GDW, GWS and OA to force switch on next flush.
524 */
525void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
526 unsigned vmid)
527{
528 struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
529 struct amdgpu_vmid *id = &id_mgr->ids[vmid];
530
531 mutex_lock(&id_mgr->lock);
532 id->owner = 0;
533 id->gds_base = 0;
534 id->gds_size = 0;
535 id->gws_base = 0;
536 id->gws_size = 0;
537 id->oa_base = 0;
538 id->oa_size = 0;
539 mutex_unlock(&id_mgr->lock);
540}
541
542/**
543 * amdgpu_vmid_reset_all - reset VMID to zero
544 *
545 * @adev: amdgpu device structure
546 *
547 * Reset VMID to force flush on next use
548 */
549void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
550{
551 unsigned i, j;
552
553 for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
554 struct amdgpu_vmid_mgr *id_mgr =
555 &adev->vm_manager.id_mgr[i];
556
557 for (j = 1; j < id_mgr->num_ids; ++j)
558 amdgpu_vmid_reset(adev, i, j);
559 }
560}
561
562/**
563 * amdgpu_vmid_mgr_init - init the VMID manager
564 *
565 * @adev: amdgpu_device pointer
566 *
567 * Initialize the VM manager structures
568 */
569void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
570{
571 unsigned i, j;
572
573 for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
574 struct amdgpu_vmid_mgr *id_mgr =
575 &adev->vm_manager.id_mgr[i];
576
577 mutex_init(&id_mgr->lock);
578 INIT_LIST_HEAD(&id_mgr->ids_lru);
579 atomic_set(&id_mgr->reserved_vmid_num, 0);
580
581 /* manage only VMIDs not used by KFD */
582 id_mgr->num_ids = adev->vm_manager.first_kfd_vmid;
583
584 /* skip over VMID 0, since it is the system VM */
585 for (j = 1; j < id_mgr->num_ids; ++j) {
586 amdgpu_vmid_reset(adev, i, j);
587 amdgpu_sync_create(&id_mgr->ids[j].active);
588 list_add_tail(&id_mgr->ids[j].list, &id_mgr->ids_lru);
589 }
590 }
591}
592
593/**
594 * amdgpu_vmid_mgr_fini - cleanup VM manager
595 *
596 * @adev: amdgpu_device pointer
597 *
598 * Cleanup the VM manager and free resources.
599 */
600void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
601{
602 unsigned i, j;
603
604 for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
605 struct amdgpu_vmid_mgr *id_mgr =
606 &adev->vm_manager.id_mgr[i];
607
608 mutex_destroy(&id_mgr->lock);
609 for (j = 0; j < AMDGPU_NUM_VMID; ++j) {
610 struct amdgpu_vmid *id = &id_mgr->ids[j];
611
612 amdgpu_sync_free(&id->active);
613 dma_fence_put(id->flushed_updates);
614 dma_fence_put(id->last_flush);
615 dma_fence_put(id->pasid_mapping);
616 }
617 }
618}