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1/*
2 * Copyright 2014 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 <linux/mutex.h>
24#include <linux/log2.h>
25#include <linux/sched.h>
26#include <linux/sched/mm.h>
27#include <linux/sched/task.h>
28#include <linux/slab.h>
29#include <linux/amd-iommu.h>
30#include <linux/notifier.h>
31#include <linux/compat.h>
32#include <linux/mman.h>
33#include <linux/file.h>
34
35struct mm_struct;
36
37#include "kfd_priv.h"
38#include "kfd_device_queue_manager.h"
39#include "kfd_dbgmgr.h"
40#include "kfd_iommu.h"
41
42/*
43 * List of struct kfd_process (field kfd_process).
44 * Unique/indexed by mm_struct*
45 */
46DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
47static DEFINE_MUTEX(kfd_processes_mutex);
48
49DEFINE_SRCU(kfd_processes_srcu);
50
51/* For process termination handling */
52static struct workqueue_struct *kfd_process_wq;
53
54/* Ordered, single-threaded workqueue for restoring evicted
55 * processes. Restoring multiple processes concurrently under memory
56 * pressure can lead to processes blocking each other from validating
57 * their BOs and result in a live-lock situation where processes
58 * remain evicted indefinitely.
59 */
60static struct workqueue_struct *kfd_restore_wq;
61
62static struct kfd_process *find_process(const struct task_struct *thread);
63static void kfd_process_ref_release(struct kref *ref);
64static struct kfd_process *create_process(const struct task_struct *thread,
65 struct file *filep);
66
67static void evict_process_worker(struct work_struct *work);
68static void restore_process_worker(struct work_struct *work);
69
70
71int kfd_process_create_wq(void)
72{
73 if (!kfd_process_wq)
74 kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
75 if (!kfd_restore_wq)
76 kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0);
77
78 if (!kfd_process_wq || !kfd_restore_wq) {
79 kfd_process_destroy_wq();
80 return -ENOMEM;
81 }
82
83 return 0;
84}
85
86void kfd_process_destroy_wq(void)
87{
88 if (kfd_process_wq) {
89 destroy_workqueue(kfd_process_wq);
90 kfd_process_wq = NULL;
91 }
92 if (kfd_restore_wq) {
93 destroy_workqueue(kfd_restore_wq);
94 kfd_restore_wq = NULL;
95 }
96}
97
98static void kfd_process_free_gpuvm(struct kgd_mem *mem,
99 struct kfd_process_device *pdd)
100{
101 struct kfd_dev *dev = pdd->dev;
102
103 dev->kfd2kgd->unmap_memory_to_gpu(dev->kgd, mem, pdd->vm);
104 dev->kfd2kgd->free_memory_of_gpu(dev->kgd, mem);
105}
106
107/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process
108 * This function should be only called right after the process
109 * is created and when kfd_processes_mutex is still being held
110 * to avoid concurrency. Because of that exclusiveness, we do
111 * not need to take p->mutex.
112 */
113static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
114 uint64_t gpu_va, uint32_t size,
115 uint32_t flags, void **kptr)
116{
117 struct kfd_dev *kdev = pdd->dev;
118 struct kgd_mem *mem = NULL;
119 int handle;
120 int err;
121
122 err = kdev->kfd2kgd->alloc_memory_of_gpu(kdev->kgd, gpu_va, size,
123 pdd->vm, &mem, NULL, flags);
124 if (err)
125 goto err_alloc_mem;
126
127 err = kdev->kfd2kgd->map_memory_to_gpu(kdev->kgd, mem, pdd->vm);
128 if (err)
129 goto err_map_mem;
130
131 err = kdev->kfd2kgd->sync_memory(kdev->kgd, mem, true);
132 if (err) {
133 pr_debug("Sync memory failed, wait interrupted by user signal\n");
134 goto sync_memory_failed;
135 }
136
137 /* Create an obj handle so kfd_process_device_remove_obj_handle
138 * will take care of the bo removal when the process finishes.
139 * We do not need to take p->mutex, because the process is just
140 * created and the ioctls have not had the chance to run.
141 */
142 handle = kfd_process_device_create_obj_handle(pdd, mem);
143
144 if (handle < 0) {
145 err = handle;
146 goto free_gpuvm;
147 }
148
149 if (kptr) {
150 err = kdev->kfd2kgd->map_gtt_bo_to_kernel(kdev->kgd,
151 (struct kgd_mem *)mem, kptr, NULL);
152 if (err) {
153 pr_debug("Map GTT BO to kernel failed\n");
154 goto free_obj_handle;
155 }
156 }
157
158 return err;
159
160free_obj_handle:
161 kfd_process_device_remove_obj_handle(pdd, handle);
162free_gpuvm:
163sync_memory_failed:
164 kfd_process_free_gpuvm(mem, pdd);
165 return err;
166
167err_map_mem:
168 kdev->kfd2kgd->free_memory_of_gpu(kdev->kgd, mem);
169err_alloc_mem:
170 *kptr = NULL;
171 return err;
172}
173
174/* kfd_process_device_reserve_ib_mem - Reserve memory inside the
175 * process for IB usage The memory reserved is for KFD to submit
176 * IB to AMDGPU from kernel. If the memory is reserved
177 * successfully, ib_kaddr will have the CPU/kernel
178 * address. Check ib_kaddr before accessing the memory.
179 */
180static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd)
181{
182 struct qcm_process_device *qpd = &pdd->qpd;
183 uint32_t flags = ALLOC_MEM_FLAGS_GTT |
184 ALLOC_MEM_FLAGS_NO_SUBSTITUTE |
185 ALLOC_MEM_FLAGS_WRITABLE |
186 ALLOC_MEM_FLAGS_EXECUTABLE;
187 void *kaddr;
188 int ret;
189
190 if (qpd->ib_kaddr || !qpd->ib_base)
191 return 0;
192
193 /* ib_base is only set for dGPU */
194 ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags,
195 &kaddr);
196 if (ret)
197 return ret;
198
199 qpd->ib_kaddr = kaddr;
200
201 return 0;
202}
203
204struct kfd_process *kfd_create_process(struct file *filep)
205{
206 struct kfd_process *process;
207 struct task_struct *thread = current;
208
209 if (!thread->mm)
210 return ERR_PTR(-EINVAL);
211
212 /* Only the pthreads threading model is supported. */
213 if (thread->group_leader->mm != thread->mm)
214 return ERR_PTR(-EINVAL);
215
216 /*
217 * take kfd processes mutex before starting of process creation
218 * so there won't be a case where two threads of the same process
219 * create two kfd_process structures
220 */
221 mutex_lock(&kfd_processes_mutex);
222
223 /* A prior open of /dev/kfd could have already created the process. */
224 process = find_process(thread);
225 if (process)
226 pr_debug("Process already found\n");
227 else
228 process = create_process(thread, filep);
229
230 mutex_unlock(&kfd_processes_mutex);
231
232 return process;
233}
234
235struct kfd_process *kfd_get_process(const struct task_struct *thread)
236{
237 struct kfd_process *process;
238
239 if (!thread->mm)
240 return ERR_PTR(-EINVAL);
241
242 /* Only the pthreads threading model is supported. */
243 if (thread->group_leader->mm != thread->mm)
244 return ERR_PTR(-EINVAL);
245
246 process = find_process(thread);
247
248 return process;
249}
250
251static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
252{
253 struct kfd_process *process;
254
255 hash_for_each_possible_rcu(kfd_processes_table, process,
256 kfd_processes, (uintptr_t)mm)
257 if (process->mm == mm)
258 return process;
259
260 return NULL;
261}
262
263static struct kfd_process *find_process(const struct task_struct *thread)
264{
265 struct kfd_process *p;
266 int idx;
267
268 idx = srcu_read_lock(&kfd_processes_srcu);
269 p = find_process_by_mm(thread->mm);
270 srcu_read_unlock(&kfd_processes_srcu, idx);
271
272 return p;
273}
274
275void kfd_unref_process(struct kfd_process *p)
276{
277 kref_put(&p->ref, kfd_process_ref_release);
278}
279
280static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
281{
282 struct kfd_process *p = pdd->process;
283 void *mem;
284 int id;
285
286 /*
287 * Remove all handles from idr and release appropriate
288 * local memory object
289 */
290 idr_for_each_entry(&pdd->alloc_idr, mem, id) {
291 struct kfd_process_device *peer_pdd;
292
293 list_for_each_entry(peer_pdd, &p->per_device_data,
294 per_device_list) {
295 if (!peer_pdd->vm)
296 continue;
297 peer_pdd->dev->kfd2kgd->unmap_memory_to_gpu(
298 peer_pdd->dev->kgd, mem, peer_pdd->vm);
299 }
300
301 pdd->dev->kfd2kgd->free_memory_of_gpu(pdd->dev->kgd, mem);
302 kfd_process_device_remove_obj_handle(pdd, id);
303 }
304}
305
306static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p)
307{
308 struct kfd_process_device *pdd;
309
310 list_for_each_entry(pdd, &p->per_device_data, per_device_list)
311 kfd_process_device_free_bos(pdd);
312}
313
314static void kfd_process_destroy_pdds(struct kfd_process *p)
315{
316 struct kfd_process_device *pdd, *temp;
317
318 list_for_each_entry_safe(pdd, temp, &p->per_device_data,
319 per_device_list) {
320 pr_debug("Releasing pdd (topology id %d) for process (pasid %d)\n",
321 pdd->dev->id, p->pasid);
322
323 if (pdd->drm_file)
324 fput(pdd->drm_file);
325 else if (pdd->vm)
326 pdd->dev->kfd2kgd->destroy_process_vm(
327 pdd->dev->kgd, pdd->vm);
328
329 list_del(&pdd->per_device_list);
330
331 if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
332 free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
333 get_order(KFD_CWSR_TBA_TMA_SIZE));
334
335 idr_destroy(&pdd->alloc_idr);
336
337 kfree(pdd);
338 }
339}
340
341/* No process locking is needed in this function, because the process
342 * is not findable any more. We must assume that no other thread is
343 * using it any more, otherwise we couldn't safely free the process
344 * structure in the end.
345 */
346static void kfd_process_wq_release(struct work_struct *work)
347{
348 struct kfd_process *p = container_of(work, struct kfd_process,
349 release_work);
350
351 kfd_iommu_unbind_process(p);
352
353 kfd_process_free_outstanding_kfd_bos(p);
354
355 kfd_process_destroy_pdds(p);
356 dma_fence_put(p->ef);
357
358 kfd_event_free_process(p);
359
360 kfd_pasid_free(p->pasid);
361 kfd_free_process_doorbells(p);
362
363 mutex_destroy(&p->mutex);
364
365 put_task_struct(p->lead_thread);
366
367 kfree(p);
368}
369
370static void kfd_process_ref_release(struct kref *ref)
371{
372 struct kfd_process *p = container_of(ref, struct kfd_process, ref);
373
374 INIT_WORK(&p->release_work, kfd_process_wq_release);
375 queue_work(kfd_process_wq, &p->release_work);
376}
377
378static void kfd_process_destroy_delayed(struct rcu_head *rcu)
379{
380 struct kfd_process *p = container_of(rcu, struct kfd_process, rcu);
381
382 kfd_unref_process(p);
383}
384
385static void kfd_process_notifier_release(struct mmu_notifier *mn,
386 struct mm_struct *mm)
387{
388 struct kfd_process *p;
389 struct kfd_process_device *pdd = NULL;
390
391 /*
392 * The kfd_process structure can not be free because the
393 * mmu_notifier srcu is read locked
394 */
395 p = container_of(mn, struct kfd_process, mmu_notifier);
396 if (WARN_ON(p->mm != mm))
397 return;
398
399 mutex_lock(&kfd_processes_mutex);
400 hash_del_rcu(&p->kfd_processes);
401 mutex_unlock(&kfd_processes_mutex);
402 synchronize_srcu(&kfd_processes_srcu);
403
404 cancel_delayed_work_sync(&p->eviction_work);
405 cancel_delayed_work_sync(&p->restore_work);
406
407 mutex_lock(&p->mutex);
408
409 /* Iterate over all process device data structures and if the
410 * pdd is in debug mode, we should first force unregistration,
411 * then we will be able to destroy the queues
412 */
413 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
414 struct kfd_dev *dev = pdd->dev;
415
416 mutex_lock(kfd_get_dbgmgr_mutex());
417 if (dev && dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
418 if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
419 kfd_dbgmgr_destroy(dev->dbgmgr);
420 dev->dbgmgr = NULL;
421 }
422 }
423 mutex_unlock(kfd_get_dbgmgr_mutex());
424 }
425
426 kfd_process_dequeue_from_all_devices(p);
427 pqm_uninit(&p->pqm);
428
429 /* Indicate to other users that MM is no longer valid */
430 p->mm = NULL;
431
432 mutex_unlock(&p->mutex);
433
434 mmu_notifier_unregister_no_release(&p->mmu_notifier, mm);
435 mmu_notifier_call_srcu(&p->rcu, &kfd_process_destroy_delayed);
436}
437
438static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
439 .release = kfd_process_notifier_release,
440};
441
442static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
443{
444 unsigned long offset;
445 struct kfd_process_device *pdd;
446
447 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
448 struct kfd_dev *dev = pdd->dev;
449 struct qcm_process_device *qpd = &pdd->qpd;
450
451 if (!dev->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base)
452 continue;
453
454 offset = (dev->id | KFD_MMAP_RESERVED_MEM_MASK) << PAGE_SHIFT;
455 qpd->tba_addr = (int64_t)vm_mmap(filep, 0,
456 KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC,
457 MAP_SHARED, offset);
458
459 if (IS_ERR_VALUE(qpd->tba_addr)) {
460 int err = qpd->tba_addr;
461
462 pr_err("Failure to set tba address. error %d.\n", err);
463 qpd->tba_addr = 0;
464 qpd->cwsr_kaddr = NULL;
465 return err;
466 }
467
468 memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
469
470 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
471 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
472 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
473 }
474
475 return 0;
476}
477
478static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
479{
480 struct kfd_dev *dev = pdd->dev;
481 struct qcm_process_device *qpd = &pdd->qpd;
482 uint32_t flags = ALLOC_MEM_FLAGS_GTT |
483 ALLOC_MEM_FLAGS_NO_SUBSTITUTE | ALLOC_MEM_FLAGS_EXECUTABLE;
484 void *kaddr;
485 int ret;
486
487 if (!dev->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base)
488 return 0;
489
490 /* cwsr_base is only set for dGPU */
491 ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base,
492 KFD_CWSR_TBA_TMA_SIZE, flags, &kaddr);
493 if (ret)
494 return ret;
495
496 qpd->cwsr_kaddr = kaddr;
497 qpd->tba_addr = qpd->cwsr_base;
498
499 memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
500
501 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
502 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
503 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
504
505 return 0;
506}
507
508static struct kfd_process *create_process(const struct task_struct *thread,
509 struct file *filep)
510{
511 struct kfd_process *process;
512 int err = -ENOMEM;
513
514 process = kzalloc(sizeof(*process), GFP_KERNEL);
515
516 if (!process)
517 goto err_alloc_process;
518
519 process->pasid = kfd_pasid_alloc();
520 if (process->pasid == 0)
521 goto err_alloc_pasid;
522
523 if (kfd_alloc_process_doorbells(process) < 0)
524 goto err_alloc_doorbells;
525
526 kref_init(&process->ref);
527
528 mutex_init(&process->mutex);
529
530 process->mm = thread->mm;
531
532 /* register notifier */
533 process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
534 err = mmu_notifier_register(&process->mmu_notifier, process->mm);
535 if (err)
536 goto err_mmu_notifier;
537
538 hash_add_rcu(kfd_processes_table, &process->kfd_processes,
539 (uintptr_t)process->mm);
540
541 process->lead_thread = thread->group_leader;
542 get_task_struct(process->lead_thread);
543
544 INIT_LIST_HEAD(&process->per_device_data);
545
546 kfd_event_init_process(process);
547
548 err = pqm_init(&process->pqm, process);
549 if (err != 0)
550 goto err_process_pqm_init;
551
552 /* init process apertures*/
553 process->is_32bit_user_mode = in_compat_syscall();
554 err = kfd_init_apertures(process);
555 if (err != 0)
556 goto err_init_apertures;
557
558 INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
559 INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
560 process->last_restore_timestamp = get_jiffies_64();
561
562 err = kfd_process_init_cwsr_apu(process, filep);
563 if (err)
564 goto err_init_cwsr;
565
566 return process;
567
568err_init_cwsr:
569 kfd_process_free_outstanding_kfd_bos(process);
570 kfd_process_destroy_pdds(process);
571err_init_apertures:
572 pqm_uninit(&process->pqm);
573err_process_pqm_init:
574 hash_del_rcu(&process->kfd_processes);
575 synchronize_rcu();
576 mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm);
577err_mmu_notifier:
578 mutex_destroy(&process->mutex);
579 kfd_free_process_doorbells(process);
580err_alloc_doorbells:
581 kfd_pasid_free(process->pasid);
582err_alloc_pasid:
583 kfree(process);
584err_alloc_process:
585 return ERR_PTR(err);
586}
587
588struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
589 struct kfd_process *p)
590{
591 struct kfd_process_device *pdd = NULL;
592
593 list_for_each_entry(pdd, &p->per_device_data, per_device_list)
594 if (pdd->dev == dev)
595 return pdd;
596
597 return NULL;
598}
599
600struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
601 struct kfd_process *p)
602{
603 struct kfd_process_device *pdd = NULL;
604
605 pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
606 if (!pdd)
607 return NULL;
608
609 pdd->dev = dev;
610 INIT_LIST_HEAD(&pdd->qpd.queues_list);
611 INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
612 pdd->qpd.dqm = dev->dqm;
613 pdd->qpd.pqm = &p->pqm;
614 pdd->qpd.evicted = 0;
615 pdd->process = p;
616 pdd->bound = PDD_UNBOUND;
617 pdd->already_dequeued = false;
618 list_add(&pdd->per_device_list, &p->per_device_data);
619
620 /* Init idr used for memory handle translation */
621 idr_init(&pdd->alloc_idr);
622
623 return pdd;
624}
625
626/**
627 * kfd_process_device_init_vm - Initialize a VM for a process-device
628 *
629 * @pdd: The process-device
630 * @drm_file: Optional pointer to a DRM file descriptor
631 *
632 * If @drm_file is specified, it will be used to acquire the VM from
633 * that file descriptor. If successful, the @pdd takes ownership of
634 * the file descriptor.
635 *
636 * If @drm_file is NULL, a new VM is created.
637 *
638 * Returns 0 on success, -errno on failure.
639 */
640int kfd_process_device_init_vm(struct kfd_process_device *pdd,
641 struct file *drm_file)
642{
643 struct kfd_process *p;
644 struct kfd_dev *dev;
645 int ret;
646
647 if (pdd->vm)
648 return drm_file ? -EBUSY : 0;
649
650 p = pdd->process;
651 dev = pdd->dev;
652
653 if (drm_file)
654 ret = dev->kfd2kgd->acquire_process_vm(
655 dev->kgd, drm_file,
656 &pdd->vm, &p->kgd_process_info, &p->ef);
657 else
658 ret = dev->kfd2kgd->create_process_vm(
659 dev->kgd, &pdd->vm, &p->kgd_process_info, &p->ef);
660 if (ret) {
661 pr_err("Failed to create process VM object\n");
662 return ret;
663 }
664
665 ret = kfd_process_device_reserve_ib_mem(pdd);
666 if (ret)
667 goto err_reserve_ib_mem;
668 ret = kfd_process_device_init_cwsr_dgpu(pdd);
669 if (ret)
670 goto err_init_cwsr;
671
672 pdd->drm_file = drm_file;
673
674 return 0;
675
676err_init_cwsr:
677err_reserve_ib_mem:
678 kfd_process_device_free_bos(pdd);
679 if (!drm_file)
680 dev->kfd2kgd->destroy_process_vm(dev->kgd, pdd->vm);
681 pdd->vm = NULL;
682
683 return ret;
684}
685
686/*
687 * Direct the IOMMU to bind the process (specifically the pasid->mm)
688 * to the device.
689 * Unbinding occurs when the process dies or the device is removed.
690 *
691 * Assumes that the process lock is held.
692 */
693struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
694 struct kfd_process *p)
695{
696 struct kfd_process_device *pdd;
697 int err;
698
699 pdd = kfd_get_process_device_data(dev, p);
700 if (!pdd) {
701 pr_err("Process device data doesn't exist\n");
702 return ERR_PTR(-ENOMEM);
703 }
704
705 err = kfd_iommu_bind_process_to_device(pdd);
706 if (err)
707 return ERR_PTR(err);
708
709 err = kfd_process_device_init_vm(pdd, NULL);
710 if (err)
711 return ERR_PTR(err);
712
713 return pdd;
714}
715
716struct kfd_process_device *kfd_get_first_process_device_data(
717 struct kfd_process *p)
718{
719 return list_first_entry(&p->per_device_data,
720 struct kfd_process_device,
721 per_device_list);
722}
723
724struct kfd_process_device *kfd_get_next_process_device_data(
725 struct kfd_process *p,
726 struct kfd_process_device *pdd)
727{
728 if (list_is_last(&pdd->per_device_list, &p->per_device_data))
729 return NULL;
730 return list_next_entry(pdd, per_device_list);
731}
732
733bool kfd_has_process_device_data(struct kfd_process *p)
734{
735 return !(list_empty(&p->per_device_data));
736}
737
738/* Create specific handle mapped to mem from process local memory idr
739 * Assumes that the process lock is held.
740 */
741int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd,
742 void *mem)
743{
744 return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL);
745}
746
747/* Translate specific handle from process local memory idr
748 * Assumes that the process lock is held.
749 */
750void *kfd_process_device_translate_handle(struct kfd_process_device *pdd,
751 int handle)
752{
753 if (handle < 0)
754 return NULL;
755
756 return idr_find(&pdd->alloc_idr, handle);
757}
758
759/* Remove specific handle from process local memory idr
760 * Assumes that the process lock is held.
761 */
762void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
763 int handle)
764{
765 if (handle >= 0)
766 idr_remove(&pdd->alloc_idr, handle);
767}
768
769/* This increments the process->ref counter. */
770struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
771{
772 struct kfd_process *p, *ret_p = NULL;
773 unsigned int temp;
774
775 int idx = srcu_read_lock(&kfd_processes_srcu);
776
777 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
778 if (p->pasid == pasid) {
779 kref_get(&p->ref);
780 ret_p = p;
781 break;
782 }
783 }
784
785 srcu_read_unlock(&kfd_processes_srcu, idx);
786
787 return ret_p;
788}
789
790/* This increments the process->ref counter. */
791struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm)
792{
793 struct kfd_process *p;
794
795 int idx = srcu_read_lock(&kfd_processes_srcu);
796
797 p = find_process_by_mm(mm);
798 if (p)
799 kref_get(&p->ref);
800
801 srcu_read_unlock(&kfd_processes_srcu, idx);
802
803 return p;
804}
805
806/* process_evict_queues - Evict all user queues of a process
807 *
808 * Eviction is reference-counted per process-device. This means multiple
809 * evictions from different sources can be nested safely.
810 */
811static int process_evict_queues(struct kfd_process *p)
812{
813 struct kfd_process_device *pdd;
814 int r = 0;
815 unsigned int n_evicted = 0;
816
817 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
818 r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
819 &pdd->qpd);
820 if (r) {
821 pr_err("Failed to evict process queues\n");
822 goto fail;
823 }
824 n_evicted++;
825 }
826
827 return r;
828
829fail:
830 /* To keep state consistent, roll back partial eviction by
831 * restoring queues
832 */
833 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
834 if (n_evicted == 0)
835 break;
836 if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
837 &pdd->qpd))
838 pr_err("Failed to restore queues\n");
839
840 n_evicted--;
841 }
842
843 return r;
844}
845
846/* process_restore_queues - Restore all user queues of a process */
847static int process_restore_queues(struct kfd_process *p)
848{
849 struct kfd_process_device *pdd;
850 int r, ret = 0;
851
852 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
853 r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
854 &pdd->qpd);
855 if (r) {
856 pr_err("Failed to restore process queues\n");
857 if (!ret)
858 ret = r;
859 }
860 }
861
862 return ret;
863}
864
865static void evict_process_worker(struct work_struct *work)
866{
867 int ret;
868 struct kfd_process *p;
869 struct delayed_work *dwork;
870
871 dwork = to_delayed_work(work);
872
873 /* Process termination destroys this worker thread. So during the
874 * lifetime of this thread, kfd_process p will be valid
875 */
876 p = container_of(dwork, struct kfd_process, eviction_work);
877 WARN_ONCE(p->last_eviction_seqno != p->ef->seqno,
878 "Eviction fence mismatch\n");
879
880 /* Narrow window of overlap between restore and evict work
881 * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos
882 * unreserves KFD BOs, it is possible to evicted again. But
883 * restore has few more steps of finish. So lets wait for any
884 * previous restore work to complete
885 */
886 flush_delayed_work(&p->restore_work);
887
888 pr_debug("Started evicting pasid %d\n", p->pasid);
889 ret = process_evict_queues(p);
890 if (!ret) {
891 dma_fence_signal(p->ef);
892 dma_fence_put(p->ef);
893 p->ef = NULL;
894 queue_delayed_work(kfd_restore_wq, &p->restore_work,
895 msecs_to_jiffies(PROCESS_RESTORE_TIME_MS));
896
897 pr_debug("Finished evicting pasid %d\n", p->pasid);
898 } else
899 pr_err("Failed to evict queues of pasid %d\n", p->pasid);
900}
901
902static void restore_process_worker(struct work_struct *work)
903{
904 struct delayed_work *dwork;
905 struct kfd_process *p;
906 struct kfd_process_device *pdd;
907 int ret = 0;
908
909 dwork = to_delayed_work(work);
910
911 /* Process termination destroys this worker thread. So during the
912 * lifetime of this thread, kfd_process p will be valid
913 */
914 p = container_of(dwork, struct kfd_process, restore_work);
915
916 /* Call restore_process_bos on the first KGD device. This function
917 * takes care of restoring the whole process including other devices.
918 * Restore can fail if enough memory is not available. If so,
919 * reschedule again.
920 */
921 pdd = list_first_entry(&p->per_device_data,
922 struct kfd_process_device,
923 per_device_list);
924
925 pr_debug("Started restoring pasid %d\n", p->pasid);
926
927 /* Setting last_restore_timestamp before successful restoration.
928 * Otherwise this would have to be set by KGD (restore_process_bos)
929 * before KFD BOs are unreserved. If not, the process can be evicted
930 * again before the timestamp is set.
931 * If restore fails, the timestamp will be set again in the next
932 * attempt. This would mean that the minimum GPU quanta would be
933 * PROCESS_ACTIVE_TIME_MS - (time to execute the following two
934 * functions)
935 */
936
937 p->last_restore_timestamp = get_jiffies_64();
938 ret = pdd->dev->kfd2kgd->restore_process_bos(p->kgd_process_info,
939 &p->ef);
940 if (ret) {
941 pr_debug("Failed to restore BOs of pasid %d, retry after %d ms\n",
942 p->pasid, PROCESS_BACK_OFF_TIME_MS);
943 ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
944 msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
945 WARN(!ret, "reschedule restore work failed\n");
946 return;
947 }
948
949 ret = process_restore_queues(p);
950 if (!ret)
951 pr_debug("Finished restoring pasid %d\n", p->pasid);
952 else
953 pr_err("Failed to restore queues of pasid %d\n", p->pasid);
954}
955
956void kfd_suspend_all_processes(void)
957{
958 struct kfd_process *p;
959 unsigned int temp;
960 int idx = srcu_read_lock(&kfd_processes_srcu);
961
962 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
963 cancel_delayed_work_sync(&p->eviction_work);
964 cancel_delayed_work_sync(&p->restore_work);
965
966 if (process_evict_queues(p))
967 pr_err("Failed to suspend process %d\n", p->pasid);
968 dma_fence_signal(p->ef);
969 dma_fence_put(p->ef);
970 p->ef = NULL;
971 }
972 srcu_read_unlock(&kfd_processes_srcu, idx);
973}
974
975int kfd_resume_all_processes(void)
976{
977 struct kfd_process *p;
978 unsigned int temp;
979 int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu);
980
981 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
982 if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) {
983 pr_err("Restore process %d failed during resume\n",
984 p->pasid);
985 ret = -EFAULT;
986 }
987 }
988 srcu_read_unlock(&kfd_processes_srcu, idx);
989 return ret;
990}
991
992int kfd_reserved_mem_mmap(struct kfd_process *process,
993 struct vm_area_struct *vma)
994{
995 struct kfd_dev *dev = kfd_device_by_id(vma->vm_pgoff);
996 struct kfd_process_device *pdd;
997 struct qcm_process_device *qpd;
998
999 if (!dev)
1000 return -EINVAL;
1001 if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) {
1002 pr_err("Incorrect CWSR mapping size.\n");
1003 return -EINVAL;
1004 }
1005
1006 pdd = kfd_get_process_device_data(dev, process);
1007 if (!pdd)
1008 return -EINVAL;
1009 qpd = &pdd->qpd;
1010
1011 qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1012 get_order(KFD_CWSR_TBA_TMA_SIZE));
1013 if (!qpd->cwsr_kaddr) {
1014 pr_err("Error allocating per process CWSR buffer.\n");
1015 return -ENOMEM;
1016 }
1017
1018 vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND
1019 | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP;
1020 /* Mapping pages to user process */
1021 return remap_pfn_range(vma, vma->vm_start,
1022 PFN_DOWN(__pa(qpd->cwsr_kaddr)),
1023 KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
1024}
1025
1026void kfd_flush_tlb(struct kfd_process_device *pdd)
1027{
1028 struct kfd_dev *dev = pdd->dev;
1029 const struct kfd2kgd_calls *f2g = dev->kfd2kgd;
1030
1031 if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
1032 /* Nothing to flush until a VMID is assigned, which
1033 * only happens when the first queue is created.
1034 */
1035 if (pdd->qpd.vmid)
1036 f2g->invalidate_tlbs_vmid(dev->kgd, pdd->qpd.vmid);
1037 } else {
1038 f2g->invalidate_tlbs(dev->kgd, pdd->process->pasid);
1039 }
1040}
1041
1042#if defined(CONFIG_DEBUG_FS)
1043
1044int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data)
1045{
1046 struct kfd_process *p;
1047 unsigned int temp;
1048 int r = 0;
1049
1050 int idx = srcu_read_lock(&kfd_processes_srcu);
1051
1052 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1053 seq_printf(m, "Process %d PASID %d:\n",
1054 p->lead_thread->tgid, p->pasid);
1055
1056 mutex_lock(&p->mutex);
1057 r = pqm_debugfs_mqds(m, &p->pqm);
1058 mutex_unlock(&p->mutex);
1059
1060 if (r)
1061 break;
1062 }
1063
1064 srcu_read_unlock(&kfd_processes_srcu, idx);
1065
1066 return r;
1067}
1068
1069#endif