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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#include "amdgpu_amdkfd.h"
35
36struct mm_struct;
37
38#include "kfd_priv.h"
39#include "kfd_device_queue_manager.h"
40#include "kfd_dbgmgr.h"
41#include "kfd_iommu.h"
42
43/*
44 * List of struct kfd_process (field kfd_process).
45 * Unique/indexed by mm_struct*
46 */
47DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
48static DEFINE_MUTEX(kfd_processes_mutex);
49
50DEFINE_SRCU(kfd_processes_srcu);
51
52/* For process termination handling */
53static struct workqueue_struct *kfd_process_wq;
54
55/* Ordered, single-threaded workqueue for restoring evicted
56 * processes. Restoring multiple processes concurrently under memory
57 * pressure can lead to processes blocking each other from validating
58 * their BOs and result in a live-lock situation where processes
59 * remain evicted indefinitely.
60 */
61static struct workqueue_struct *kfd_restore_wq;
62
63static struct kfd_process *find_process(const struct task_struct *thread);
64static void kfd_process_ref_release(struct kref *ref);
65static struct kfd_process *create_process(const struct task_struct *thread);
66static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep);
67
68static void evict_process_worker(struct work_struct *work);
69static void restore_process_worker(struct work_struct *work);
70
71struct kfd_procfs_tree {
72 struct kobject *kobj;
73};
74
75static struct kfd_procfs_tree procfs;
76
77static ssize_t kfd_procfs_show(struct kobject *kobj, struct attribute *attr,
78 char *buffer)
79{
80 int val = 0;
81
82 if (strcmp(attr->name, "pasid") == 0) {
83 struct kfd_process *p = container_of(attr, struct kfd_process,
84 attr_pasid);
85 val = p->pasid;
86 } else {
87 pr_err("Invalid attribute");
88 return -EINVAL;
89 }
90
91 return snprintf(buffer, PAGE_SIZE, "%d\n", val);
92}
93
94static void kfd_procfs_kobj_release(struct kobject *kobj)
95{
96 kfree(kobj);
97}
98
99static const struct sysfs_ops kfd_procfs_ops = {
100 .show = kfd_procfs_show,
101};
102
103static struct kobj_type procfs_type = {
104 .release = kfd_procfs_kobj_release,
105 .sysfs_ops = &kfd_procfs_ops,
106};
107
108void kfd_procfs_init(void)
109{
110 int ret = 0;
111
112 procfs.kobj = kfd_alloc_struct(procfs.kobj);
113 if (!procfs.kobj)
114 return;
115
116 ret = kobject_init_and_add(procfs.kobj, &procfs_type,
117 &kfd_device->kobj, "proc");
118 if (ret) {
119 pr_warn("Could not create procfs proc folder");
120 /* If we fail to create the procfs, clean up */
121 kfd_procfs_shutdown();
122 }
123}
124
125void kfd_procfs_shutdown(void)
126{
127 if (procfs.kobj) {
128 kobject_del(procfs.kobj);
129 kobject_put(procfs.kobj);
130 procfs.kobj = NULL;
131 }
132}
133
134int kfd_process_create_wq(void)
135{
136 if (!kfd_process_wq)
137 kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
138 if (!kfd_restore_wq)
139 kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0);
140
141 if (!kfd_process_wq || !kfd_restore_wq) {
142 kfd_process_destroy_wq();
143 return -ENOMEM;
144 }
145
146 return 0;
147}
148
149void kfd_process_destroy_wq(void)
150{
151 if (kfd_process_wq) {
152 destroy_workqueue(kfd_process_wq);
153 kfd_process_wq = NULL;
154 }
155 if (kfd_restore_wq) {
156 destroy_workqueue(kfd_restore_wq);
157 kfd_restore_wq = NULL;
158 }
159}
160
161static void kfd_process_free_gpuvm(struct kgd_mem *mem,
162 struct kfd_process_device *pdd)
163{
164 struct kfd_dev *dev = pdd->dev;
165
166 amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(dev->kgd, mem, pdd->vm);
167 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, mem);
168}
169
170/* kfd_process_alloc_gpuvm - Allocate GPU VM for the KFD process
171 * This function should be only called right after the process
172 * is created and when kfd_processes_mutex is still being held
173 * to avoid concurrency. Because of that exclusiveness, we do
174 * not need to take p->mutex.
175 */
176static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
177 uint64_t gpu_va, uint32_t size,
178 uint32_t flags, void **kptr)
179{
180 struct kfd_dev *kdev = pdd->dev;
181 struct kgd_mem *mem = NULL;
182 int handle;
183 int err;
184
185 err = amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(kdev->kgd, gpu_va, size,
186 pdd->vm, &mem, NULL, flags);
187 if (err)
188 goto err_alloc_mem;
189
190 err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem, pdd->vm);
191 if (err)
192 goto err_map_mem;
193
194 err = amdgpu_amdkfd_gpuvm_sync_memory(kdev->kgd, mem, true);
195 if (err) {
196 pr_debug("Sync memory failed, wait interrupted by user signal\n");
197 goto sync_memory_failed;
198 }
199
200 /* Create an obj handle so kfd_process_device_remove_obj_handle
201 * will take care of the bo removal when the process finishes.
202 * We do not need to take p->mutex, because the process is just
203 * created and the ioctls have not had the chance to run.
204 */
205 handle = kfd_process_device_create_obj_handle(pdd, mem);
206
207 if (handle < 0) {
208 err = handle;
209 goto free_gpuvm;
210 }
211
212 if (kptr) {
213 err = amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(kdev->kgd,
214 (struct kgd_mem *)mem, kptr, NULL);
215 if (err) {
216 pr_debug("Map GTT BO to kernel failed\n");
217 goto free_obj_handle;
218 }
219 }
220
221 return err;
222
223free_obj_handle:
224 kfd_process_device_remove_obj_handle(pdd, handle);
225free_gpuvm:
226sync_memory_failed:
227 kfd_process_free_gpuvm(mem, pdd);
228 return err;
229
230err_map_mem:
231 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->kgd, mem);
232err_alloc_mem:
233 *kptr = NULL;
234 return err;
235}
236
237/* kfd_process_device_reserve_ib_mem - Reserve memory inside the
238 * process for IB usage The memory reserved is for KFD to submit
239 * IB to AMDGPU from kernel. If the memory is reserved
240 * successfully, ib_kaddr will have the CPU/kernel
241 * address. Check ib_kaddr before accessing the memory.
242 */
243static int kfd_process_device_reserve_ib_mem(struct kfd_process_device *pdd)
244{
245 struct qcm_process_device *qpd = &pdd->qpd;
246 uint32_t flags = ALLOC_MEM_FLAGS_GTT |
247 ALLOC_MEM_FLAGS_NO_SUBSTITUTE |
248 ALLOC_MEM_FLAGS_WRITABLE |
249 ALLOC_MEM_FLAGS_EXECUTABLE;
250 void *kaddr;
251 int ret;
252
253 if (qpd->ib_kaddr || !qpd->ib_base)
254 return 0;
255
256 /* ib_base is only set for dGPU */
257 ret = kfd_process_alloc_gpuvm(pdd, qpd->ib_base, PAGE_SIZE, flags,
258 &kaddr);
259 if (ret)
260 return ret;
261
262 qpd->ib_kaddr = kaddr;
263
264 return 0;
265}
266
267struct kfd_process *kfd_create_process(struct file *filep)
268{
269 struct kfd_process *process;
270 struct task_struct *thread = current;
271 int ret;
272
273 if (!thread->mm)
274 return ERR_PTR(-EINVAL);
275
276 /* Only the pthreads threading model is supported. */
277 if (thread->group_leader->mm != thread->mm)
278 return ERR_PTR(-EINVAL);
279
280 /*
281 * take kfd processes mutex before starting of process creation
282 * so there won't be a case where two threads of the same process
283 * create two kfd_process structures
284 */
285 mutex_lock(&kfd_processes_mutex);
286
287 /* A prior open of /dev/kfd could have already created the process. */
288 process = find_process(thread);
289 if (process) {
290 pr_debug("Process already found\n");
291 } else {
292 process = create_process(thread);
293 if (IS_ERR(process))
294 goto out;
295
296 ret = kfd_process_init_cwsr_apu(process, filep);
297 if (ret) {
298 process = ERR_PTR(ret);
299 goto out;
300 }
301
302 if (!procfs.kobj)
303 goto out;
304
305 process->kobj = kfd_alloc_struct(process->kobj);
306 if (!process->kobj) {
307 pr_warn("Creating procfs kobject failed");
308 goto out;
309 }
310 ret = kobject_init_and_add(process->kobj, &procfs_type,
311 procfs.kobj, "%d",
312 (int)process->lead_thread->pid);
313 if (ret) {
314 pr_warn("Creating procfs pid directory failed");
315 goto out;
316 }
317
318 process->attr_pasid.name = "pasid";
319 process->attr_pasid.mode = KFD_SYSFS_FILE_MODE;
320 sysfs_attr_init(&process->attr_pasid);
321 ret = sysfs_create_file(process->kobj, &process->attr_pasid);
322 if (ret)
323 pr_warn("Creating pasid for pid %d failed",
324 (int)process->lead_thread->pid);
325 }
326out:
327 mutex_unlock(&kfd_processes_mutex);
328
329 return process;
330}
331
332struct kfd_process *kfd_get_process(const struct task_struct *thread)
333{
334 struct kfd_process *process;
335
336 if (!thread->mm)
337 return ERR_PTR(-EINVAL);
338
339 /* Only the pthreads threading model is supported. */
340 if (thread->group_leader->mm != thread->mm)
341 return ERR_PTR(-EINVAL);
342
343 process = find_process(thread);
344 if (!process)
345 return ERR_PTR(-EINVAL);
346
347 return process;
348}
349
350static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
351{
352 struct kfd_process *process;
353
354 hash_for_each_possible_rcu(kfd_processes_table, process,
355 kfd_processes, (uintptr_t)mm)
356 if (process->mm == mm)
357 return process;
358
359 return NULL;
360}
361
362static struct kfd_process *find_process(const struct task_struct *thread)
363{
364 struct kfd_process *p;
365 int idx;
366
367 idx = srcu_read_lock(&kfd_processes_srcu);
368 p = find_process_by_mm(thread->mm);
369 srcu_read_unlock(&kfd_processes_srcu, idx);
370
371 return p;
372}
373
374void kfd_unref_process(struct kfd_process *p)
375{
376 kref_put(&p->ref, kfd_process_ref_release);
377}
378
379static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
380{
381 struct kfd_process *p = pdd->process;
382 void *mem;
383 int id;
384
385 /*
386 * Remove all handles from idr and release appropriate
387 * local memory object
388 */
389 idr_for_each_entry(&pdd->alloc_idr, mem, id) {
390 struct kfd_process_device *peer_pdd;
391
392 list_for_each_entry(peer_pdd, &p->per_device_data,
393 per_device_list) {
394 if (!peer_pdd->vm)
395 continue;
396 amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
397 peer_pdd->dev->kgd, mem, peer_pdd->vm);
398 }
399
400 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->kgd, mem);
401 kfd_process_device_remove_obj_handle(pdd, id);
402 }
403}
404
405static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p)
406{
407 struct kfd_process_device *pdd;
408
409 list_for_each_entry(pdd, &p->per_device_data, per_device_list)
410 kfd_process_device_free_bos(pdd);
411}
412
413static void kfd_process_destroy_pdds(struct kfd_process *p)
414{
415 struct kfd_process_device *pdd, *temp;
416
417 list_for_each_entry_safe(pdd, temp, &p->per_device_data,
418 per_device_list) {
419 pr_debug("Releasing pdd (topology id %d) for process (pasid %d)\n",
420 pdd->dev->id, p->pasid);
421
422 if (pdd->drm_file) {
423 amdgpu_amdkfd_gpuvm_release_process_vm(
424 pdd->dev->kgd, pdd->vm);
425 fput(pdd->drm_file);
426 }
427 else if (pdd->vm)
428 amdgpu_amdkfd_gpuvm_destroy_process_vm(
429 pdd->dev->kgd, pdd->vm);
430
431 list_del(&pdd->per_device_list);
432
433 if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
434 free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
435 get_order(KFD_CWSR_TBA_TMA_SIZE));
436
437 kfree(pdd->qpd.doorbell_bitmap);
438 idr_destroy(&pdd->alloc_idr);
439
440 kfree(pdd);
441 }
442}
443
444/* No process locking is needed in this function, because the process
445 * is not findable any more. We must assume that no other thread is
446 * using it any more, otherwise we couldn't safely free the process
447 * structure in the end.
448 */
449static void kfd_process_wq_release(struct work_struct *work)
450{
451 struct kfd_process *p = container_of(work, struct kfd_process,
452 release_work);
453
454 /* Remove the procfs files */
455 if (p->kobj) {
456 sysfs_remove_file(p->kobj, &p->attr_pasid);
457 kobject_del(p->kobj);
458 kobject_put(p->kobj);
459 p->kobj = NULL;
460 }
461
462 kfd_iommu_unbind_process(p);
463
464 kfd_process_free_outstanding_kfd_bos(p);
465
466 kfd_process_destroy_pdds(p);
467 dma_fence_put(p->ef);
468
469 kfd_event_free_process(p);
470
471 kfd_pasid_free(p->pasid);
472 kfd_free_process_doorbells(p);
473
474 mutex_destroy(&p->mutex);
475
476 put_task_struct(p->lead_thread);
477
478 kfree(p);
479}
480
481static void kfd_process_ref_release(struct kref *ref)
482{
483 struct kfd_process *p = container_of(ref, struct kfd_process, ref);
484
485 INIT_WORK(&p->release_work, kfd_process_wq_release);
486 queue_work(kfd_process_wq, &p->release_work);
487}
488
489static void kfd_process_free_notifier(struct mmu_notifier *mn)
490{
491 kfd_unref_process(container_of(mn, struct kfd_process, mmu_notifier));
492}
493
494static void kfd_process_notifier_release(struct mmu_notifier *mn,
495 struct mm_struct *mm)
496{
497 struct kfd_process *p;
498 struct kfd_process_device *pdd = NULL;
499
500 /*
501 * The kfd_process structure can not be free because the
502 * mmu_notifier srcu is read locked
503 */
504 p = container_of(mn, struct kfd_process, mmu_notifier);
505 if (WARN_ON(p->mm != mm))
506 return;
507
508 mutex_lock(&kfd_processes_mutex);
509 hash_del_rcu(&p->kfd_processes);
510 mutex_unlock(&kfd_processes_mutex);
511 synchronize_srcu(&kfd_processes_srcu);
512
513 cancel_delayed_work_sync(&p->eviction_work);
514 cancel_delayed_work_sync(&p->restore_work);
515
516 mutex_lock(&p->mutex);
517
518 /* Iterate over all process device data structures and if the
519 * pdd is in debug mode, we should first force unregistration,
520 * then we will be able to destroy the queues
521 */
522 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
523 struct kfd_dev *dev = pdd->dev;
524
525 mutex_lock(kfd_get_dbgmgr_mutex());
526 if (dev && dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
527 if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
528 kfd_dbgmgr_destroy(dev->dbgmgr);
529 dev->dbgmgr = NULL;
530 }
531 }
532 mutex_unlock(kfd_get_dbgmgr_mutex());
533 }
534
535 kfd_process_dequeue_from_all_devices(p);
536 pqm_uninit(&p->pqm);
537
538 /* Indicate to other users that MM is no longer valid */
539 p->mm = NULL;
540
541 mutex_unlock(&p->mutex);
542
543 mmu_notifier_put(&p->mmu_notifier);
544}
545
546static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
547 .release = kfd_process_notifier_release,
548 .free_notifier = kfd_process_free_notifier,
549};
550
551static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
552{
553 unsigned long offset;
554 struct kfd_process_device *pdd;
555
556 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
557 struct kfd_dev *dev = pdd->dev;
558 struct qcm_process_device *qpd = &pdd->qpd;
559
560 if (!dev->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base)
561 continue;
562
563 offset = (KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id))
564 << PAGE_SHIFT;
565 qpd->tba_addr = (int64_t)vm_mmap(filep, 0,
566 KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC,
567 MAP_SHARED, offset);
568
569 if (IS_ERR_VALUE(qpd->tba_addr)) {
570 int err = qpd->tba_addr;
571
572 pr_err("Failure to set tba address. error %d.\n", err);
573 qpd->tba_addr = 0;
574 qpd->cwsr_kaddr = NULL;
575 return err;
576 }
577
578 memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
579
580 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
581 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
582 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
583 }
584
585 return 0;
586}
587
588static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
589{
590 struct kfd_dev *dev = pdd->dev;
591 struct qcm_process_device *qpd = &pdd->qpd;
592 uint32_t flags = ALLOC_MEM_FLAGS_GTT |
593 ALLOC_MEM_FLAGS_NO_SUBSTITUTE | ALLOC_MEM_FLAGS_EXECUTABLE;
594 void *kaddr;
595 int ret;
596
597 if (!dev->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base)
598 return 0;
599
600 /* cwsr_base is only set for dGPU */
601 ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base,
602 KFD_CWSR_TBA_TMA_SIZE, flags, &kaddr);
603 if (ret)
604 return ret;
605
606 qpd->cwsr_kaddr = kaddr;
607 qpd->tba_addr = qpd->cwsr_base;
608
609 memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
610
611 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
612 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
613 qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
614
615 return 0;
616}
617
618/*
619 * On return the kfd_process is fully operational and will be freed when the
620 * mm is released
621 */
622static struct kfd_process *create_process(const struct task_struct *thread)
623{
624 struct kfd_process *process;
625 int err = -ENOMEM;
626
627 process = kzalloc(sizeof(*process), GFP_KERNEL);
628 if (!process)
629 goto err_alloc_process;
630
631 kref_init(&process->ref);
632 mutex_init(&process->mutex);
633 process->mm = thread->mm;
634 process->lead_thread = thread->group_leader;
635 INIT_LIST_HEAD(&process->per_device_data);
636 INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
637 INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
638 process->last_restore_timestamp = get_jiffies_64();
639 kfd_event_init_process(process);
640 process->is_32bit_user_mode = in_compat_syscall();
641
642 process->pasid = kfd_pasid_alloc();
643 if (process->pasid == 0)
644 goto err_alloc_pasid;
645
646 if (kfd_alloc_process_doorbells(process) < 0)
647 goto err_alloc_doorbells;
648
649 err = pqm_init(&process->pqm, process);
650 if (err != 0)
651 goto err_process_pqm_init;
652
653 /* init process apertures*/
654 err = kfd_init_apertures(process);
655 if (err != 0)
656 goto err_init_apertures;
657
658 /* Must be last, have to use release destruction after this */
659 process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
660 err = mmu_notifier_register(&process->mmu_notifier, process->mm);
661 if (err)
662 goto err_register_notifier;
663
664 get_task_struct(process->lead_thread);
665 hash_add_rcu(kfd_processes_table, &process->kfd_processes,
666 (uintptr_t)process->mm);
667
668 return process;
669
670err_register_notifier:
671 kfd_process_free_outstanding_kfd_bos(process);
672 kfd_process_destroy_pdds(process);
673err_init_apertures:
674 pqm_uninit(&process->pqm);
675err_process_pqm_init:
676 kfd_free_process_doorbells(process);
677err_alloc_doorbells:
678 kfd_pasid_free(process->pasid);
679err_alloc_pasid:
680 mutex_destroy(&process->mutex);
681 kfree(process);
682err_alloc_process:
683 return ERR_PTR(err);
684}
685
686static int init_doorbell_bitmap(struct qcm_process_device *qpd,
687 struct kfd_dev *dev)
688{
689 unsigned int i;
690
691 if (!KFD_IS_SOC15(dev->device_info->asic_family))
692 return 0;
693
694 qpd->doorbell_bitmap =
695 kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
696 BITS_PER_BYTE), GFP_KERNEL);
697 if (!qpd->doorbell_bitmap)
698 return -ENOMEM;
699
700 /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */
701 for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {
702 if (i >= dev->shared_resources.non_cp_doorbells_start
703 && i <= dev->shared_resources.non_cp_doorbells_end) {
704 set_bit(i, qpd->doorbell_bitmap);
705 set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
706 qpd->doorbell_bitmap);
707 pr_debug("reserved doorbell 0x%03x and 0x%03x\n", i,
708 i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);
709 }
710 }
711
712 return 0;
713}
714
715struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
716 struct kfd_process *p)
717{
718 struct kfd_process_device *pdd = NULL;
719
720 list_for_each_entry(pdd, &p->per_device_data, per_device_list)
721 if (pdd->dev == dev)
722 return pdd;
723
724 return NULL;
725}
726
727struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
728 struct kfd_process *p)
729{
730 struct kfd_process_device *pdd = NULL;
731
732 pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
733 if (!pdd)
734 return NULL;
735
736 if (init_doorbell_bitmap(&pdd->qpd, dev)) {
737 pr_err("Failed to init doorbell for process\n");
738 kfree(pdd);
739 return NULL;
740 }
741
742 pdd->dev = dev;
743 INIT_LIST_HEAD(&pdd->qpd.queues_list);
744 INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
745 pdd->qpd.dqm = dev->dqm;
746 pdd->qpd.pqm = &p->pqm;
747 pdd->qpd.evicted = 0;
748 pdd->process = p;
749 pdd->bound = PDD_UNBOUND;
750 pdd->already_dequeued = false;
751 list_add(&pdd->per_device_list, &p->per_device_data);
752
753 /* Init idr used for memory handle translation */
754 idr_init(&pdd->alloc_idr);
755
756 return pdd;
757}
758
759/**
760 * kfd_process_device_init_vm - Initialize a VM for a process-device
761 *
762 * @pdd: The process-device
763 * @drm_file: Optional pointer to a DRM file descriptor
764 *
765 * If @drm_file is specified, it will be used to acquire the VM from
766 * that file descriptor. If successful, the @pdd takes ownership of
767 * the file descriptor.
768 *
769 * If @drm_file is NULL, a new VM is created.
770 *
771 * Returns 0 on success, -errno on failure.
772 */
773int kfd_process_device_init_vm(struct kfd_process_device *pdd,
774 struct file *drm_file)
775{
776 struct kfd_process *p;
777 struct kfd_dev *dev;
778 int ret;
779
780 if (pdd->vm)
781 return drm_file ? -EBUSY : 0;
782
783 p = pdd->process;
784 dev = pdd->dev;
785
786 if (drm_file)
787 ret = amdgpu_amdkfd_gpuvm_acquire_process_vm(
788 dev->kgd, drm_file, p->pasid,
789 &pdd->vm, &p->kgd_process_info, &p->ef);
790 else
791 ret = amdgpu_amdkfd_gpuvm_create_process_vm(dev->kgd, p->pasid,
792 &pdd->vm, &p->kgd_process_info, &p->ef);
793 if (ret) {
794 pr_err("Failed to create process VM object\n");
795 return ret;
796 }
797
798 amdgpu_vm_set_task_info(pdd->vm);
799
800 ret = kfd_process_device_reserve_ib_mem(pdd);
801 if (ret)
802 goto err_reserve_ib_mem;
803 ret = kfd_process_device_init_cwsr_dgpu(pdd);
804 if (ret)
805 goto err_init_cwsr;
806
807 pdd->drm_file = drm_file;
808
809 return 0;
810
811err_init_cwsr:
812err_reserve_ib_mem:
813 kfd_process_device_free_bos(pdd);
814 if (!drm_file)
815 amdgpu_amdkfd_gpuvm_destroy_process_vm(dev->kgd, pdd->vm);
816 pdd->vm = NULL;
817
818 return ret;
819}
820
821/*
822 * Direct the IOMMU to bind the process (specifically the pasid->mm)
823 * to the device.
824 * Unbinding occurs when the process dies or the device is removed.
825 *
826 * Assumes that the process lock is held.
827 */
828struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
829 struct kfd_process *p)
830{
831 struct kfd_process_device *pdd;
832 int err;
833
834 pdd = kfd_get_process_device_data(dev, p);
835 if (!pdd) {
836 pr_err("Process device data doesn't exist\n");
837 return ERR_PTR(-ENOMEM);
838 }
839
840 err = kfd_iommu_bind_process_to_device(pdd);
841 if (err)
842 return ERR_PTR(err);
843
844 err = kfd_process_device_init_vm(pdd, NULL);
845 if (err)
846 return ERR_PTR(err);
847
848 return pdd;
849}
850
851struct kfd_process_device *kfd_get_first_process_device_data(
852 struct kfd_process *p)
853{
854 return list_first_entry(&p->per_device_data,
855 struct kfd_process_device,
856 per_device_list);
857}
858
859struct kfd_process_device *kfd_get_next_process_device_data(
860 struct kfd_process *p,
861 struct kfd_process_device *pdd)
862{
863 if (list_is_last(&pdd->per_device_list, &p->per_device_data))
864 return NULL;
865 return list_next_entry(pdd, per_device_list);
866}
867
868bool kfd_has_process_device_data(struct kfd_process *p)
869{
870 return !(list_empty(&p->per_device_data));
871}
872
873/* Create specific handle mapped to mem from process local memory idr
874 * Assumes that the process lock is held.
875 */
876int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd,
877 void *mem)
878{
879 return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL);
880}
881
882/* Translate specific handle from process local memory idr
883 * Assumes that the process lock is held.
884 */
885void *kfd_process_device_translate_handle(struct kfd_process_device *pdd,
886 int handle)
887{
888 if (handle < 0)
889 return NULL;
890
891 return idr_find(&pdd->alloc_idr, handle);
892}
893
894/* Remove specific handle from process local memory idr
895 * Assumes that the process lock is held.
896 */
897void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
898 int handle)
899{
900 if (handle >= 0)
901 idr_remove(&pdd->alloc_idr, handle);
902}
903
904/* This increments the process->ref counter. */
905struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
906{
907 struct kfd_process *p, *ret_p = NULL;
908 unsigned int temp;
909
910 int idx = srcu_read_lock(&kfd_processes_srcu);
911
912 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
913 if (p->pasid == pasid) {
914 kref_get(&p->ref);
915 ret_p = p;
916 break;
917 }
918 }
919
920 srcu_read_unlock(&kfd_processes_srcu, idx);
921
922 return ret_p;
923}
924
925/* This increments the process->ref counter. */
926struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm)
927{
928 struct kfd_process *p;
929
930 int idx = srcu_read_lock(&kfd_processes_srcu);
931
932 p = find_process_by_mm(mm);
933 if (p)
934 kref_get(&p->ref);
935
936 srcu_read_unlock(&kfd_processes_srcu, idx);
937
938 return p;
939}
940
941/* process_evict_queues - Evict all user queues of a process
942 *
943 * Eviction is reference-counted per process-device. This means multiple
944 * evictions from different sources can be nested safely.
945 */
946int kfd_process_evict_queues(struct kfd_process *p)
947{
948 struct kfd_process_device *pdd;
949 int r = 0;
950 unsigned int n_evicted = 0;
951
952 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
953 r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
954 &pdd->qpd);
955 if (r) {
956 pr_err("Failed to evict process queues\n");
957 goto fail;
958 }
959 n_evicted++;
960 }
961
962 return r;
963
964fail:
965 /* To keep state consistent, roll back partial eviction by
966 * restoring queues
967 */
968 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
969 if (n_evicted == 0)
970 break;
971 if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
972 &pdd->qpd))
973 pr_err("Failed to restore queues\n");
974
975 n_evicted--;
976 }
977
978 return r;
979}
980
981/* process_restore_queues - Restore all user queues of a process */
982int kfd_process_restore_queues(struct kfd_process *p)
983{
984 struct kfd_process_device *pdd;
985 int r, ret = 0;
986
987 list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
988 r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
989 &pdd->qpd);
990 if (r) {
991 pr_err("Failed to restore process queues\n");
992 if (!ret)
993 ret = r;
994 }
995 }
996
997 return ret;
998}
999
1000static void evict_process_worker(struct work_struct *work)
1001{
1002 int ret;
1003 struct kfd_process *p;
1004 struct delayed_work *dwork;
1005
1006 dwork = to_delayed_work(work);
1007
1008 /* Process termination destroys this worker thread. So during the
1009 * lifetime of this thread, kfd_process p will be valid
1010 */
1011 p = container_of(dwork, struct kfd_process, eviction_work);
1012 WARN_ONCE(p->last_eviction_seqno != p->ef->seqno,
1013 "Eviction fence mismatch\n");
1014
1015 /* Narrow window of overlap between restore and evict work
1016 * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos
1017 * unreserves KFD BOs, it is possible to evicted again. But
1018 * restore has few more steps of finish. So lets wait for any
1019 * previous restore work to complete
1020 */
1021 flush_delayed_work(&p->restore_work);
1022
1023 pr_debug("Started evicting pasid %d\n", p->pasid);
1024 ret = kfd_process_evict_queues(p);
1025 if (!ret) {
1026 dma_fence_signal(p->ef);
1027 dma_fence_put(p->ef);
1028 p->ef = NULL;
1029 queue_delayed_work(kfd_restore_wq, &p->restore_work,
1030 msecs_to_jiffies(PROCESS_RESTORE_TIME_MS));
1031
1032 pr_debug("Finished evicting pasid %d\n", p->pasid);
1033 } else
1034 pr_err("Failed to evict queues of pasid %d\n", p->pasid);
1035}
1036
1037static void restore_process_worker(struct work_struct *work)
1038{
1039 struct delayed_work *dwork;
1040 struct kfd_process *p;
1041 int ret = 0;
1042
1043 dwork = to_delayed_work(work);
1044
1045 /* Process termination destroys this worker thread. So during the
1046 * lifetime of this thread, kfd_process p will be valid
1047 */
1048 p = container_of(dwork, struct kfd_process, restore_work);
1049 pr_debug("Started restoring pasid %d\n", p->pasid);
1050
1051 /* Setting last_restore_timestamp before successful restoration.
1052 * Otherwise this would have to be set by KGD (restore_process_bos)
1053 * before KFD BOs are unreserved. If not, the process can be evicted
1054 * again before the timestamp is set.
1055 * If restore fails, the timestamp will be set again in the next
1056 * attempt. This would mean that the minimum GPU quanta would be
1057 * PROCESS_ACTIVE_TIME_MS - (time to execute the following two
1058 * functions)
1059 */
1060
1061 p->last_restore_timestamp = get_jiffies_64();
1062 ret = amdgpu_amdkfd_gpuvm_restore_process_bos(p->kgd_process_info,
1063 &p->ef);
1064 if (ret) {
1065 pr_debug("Failed to restore BOs of pasid %d, retry after %d ms\n",
1066 p->pasid, PROCESS_BACK_OFF_TIME_MS);
1067 ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
1068 msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
1069 WARN(!ret, "reschedule restore work failed\n");
1070 return;
1071 }
1072
1073 ret = kfd_process_restore_queues(p);
1074 if (!ret)
1075 pr_debug("Finished restoring pasid %d\n", p->pasid);
1076 else
1077 pr_err("Failed to restore queues of pasid %d\n", p->pasid);
1078}
1079
1080void kfd_suspend_all_processes(void)
1081{
1082 struct kfd_process *p;
1083 unsigned int temp;
1084 int idx = srcu_read_lock(&kfd_processes_srcu);
1085
1086 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1087 cancel_delayed_work_sync(&p->eviction_work);
1088 cancel_delayed_work_sync(&p->restore_work);
1089
1090 if (kfd_process_evict_queues(p))
1091 pr_err("Failed to suspend process %d\n", p->pasid);
1092 dma_fence_signal(p->ef);
1093 dma_fence_put(p->ef);
1094 p->ef = NULL;
1095 }
1096 srcu_read_unlock(&kfd_processes_srcu, idx);
1097}
1098
1099int kfd_resume_all_processes(void)
1100{
1101 struct kfd_process *p;
1102 unsigned int temp;
1103 int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu);
1104
1105 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1106 if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) {
1107 pr_err("Restore process %d failed during resume\n",
1108 p->pasid);
1109 ret = -EFAULT;
1110 }
1111 }
1112 srcu_read_unlock(&kfd_processes_srcu, idx);
1113 return ret;
1114}
1115
1116int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
1117 struct vm_area_struct *vma)
1118{
1119 struct kfd_process_device *pdd;
1120 struct qcm_process_device *qpd;
1121
1122 if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) {
1123 pr_err("Incorrect CWSR mapping size.\n");
1124 return -EINVAL;
1125 }
1126
1127 pdd = kfd_get_process_device_data(dev, process);
1128 if (!pdd)
1129 return -EINVAL;
1130 qpd = &pdd->qpd;
1131
1132 qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1133 get_order(KFD_CWSR_TBA_TMA_SIZE));
1134 if (!qpd->cwsr_kaddr) {
1135 pr_err("Error allocating per process CWSR buffer.\n");
1136 return -ENOMEM;
1137 }
1138
1139 vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND
1140 | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP;
1141 /* Mapping pages to user process */
1142 return remap_pfn_range(vma, vma->vm_start,
1143 PFN_DOWN(__pa(qpd->cwsr_kaddr)),
1144 KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
1145}
1146
1147void kfd_flush_tlb(struct kfd_process_device *pdd)
1148{
1149 struct kfd_dev *dev = pdd->dev;
1150 const struct kfd2kgd_calls *f2g = dev->kfd2kgd;
1151
1152 if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
1153 /* Nothing to flush until a VMID is assigned, which
1154 * only happens when the first queue is created.
1155 */
1156 if (pdd->qpd.vmid)
1157 f2g->invalidate_tlbs_vmid(dev->kgd, pdd->qpd.vmid);
1158 } else {
1159 f2g->invalidate_tlbs(dev->kgd, pdd->process->pasid);
1160 }
1161}
1162
1163#if defined(CONFIG_DEBUG_FS)
1164
1165int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data)
1166{
1167 struct kfd_process *p;
1168 unsigned int temp;
1169 int r = 0;
1170
1171 int idx = srcu_read_lock(&kfd_processes_srcu);
1172
1173 hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1174 seq_printf(m, "Process %d PASID %d:\n",
1175 p->lead_thread->tgid, p->pasid);
1176
1177 mutex_lock(&p->mutex);
1178 r = pqm_debugfs_mqds(m, &p->pqm);
1179 mutex_unlock(&p->mutex);
1180
1181 if (r)
1182 break;
1183 }
1184
1185 srcu_read_unlock(&kfd_processes_srcu, idx);
1186
1187 return r;
1188}
1189
1190#endif
1191