drivers/gpu/drm/amd/amdkfd/kfd_process.c

   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
  36 struct 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  */
  47 DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
  48 static DEFINE_MUTEX(kfd_processes_mutex);
  49
  50 DEFINE_SRCU(kfd_processes_srcu);
  51
  52 /* For process termination handling */
  53 static 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  */
  61 static struct workqueue_struct *kfd_restore_wq;
  62
  63 static struct kfd_process *find_process(const struct task_struct *thread);
  64 static void kfd_process_ref_release(struct kref *ref);
  65 static struct kfd_process *create_process(const struct task_struct *thread,
  66                                         struct file *filep);
  67
  68 static void evict_process_worker(struct work_struct *work);
  69 static void restore_process_worker(struct work_struct *work);
  70
  71 struct kfd_procfs_tree {
  72         struct kobject *kobj;
  73 };
  74
  75 static struct kfd_procfs_tree procfs;
  76
  77 static 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
  94 static void kfd_procfs_kobj_release(struct kobject *kobj)
  95 {
  96         kfree(kobj);
  97 }
  98
  99 static const struct sysfs_ops kfd_procfs_ops = {
 100         .show = kfd_procfs_show,
 101 };
 102
 103 static struct kobj_type procfs_type = {
 104         .release = kfd_procfs_kobj_release,
 105         .sysfs_ops = &kfd_procfs_ops,
 106 };
 107
 108 void 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
 125 void 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
 134 int 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
 149 void 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
 161 static 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  */
 176 static 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
 223 free_obj_handle:
 224         kfd_process_device_remove_obj_handle(pdd, handle);
 225 free_gpuvm:
 226 sync_memory_failed:
 227         kfd_process_free_gpuvm(mem, pdd);
 228         return err;
 229
 230 err_map_mem:
 231         amdgpu_amdkfd_gpuvm_free_memory_of_gpu(kdev->kgd, mem);
 232 err_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  */
 243 static 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
 267 struct 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, filep);
 293
 294                 if (!procfs.kobj)
 295                         goto out;
 296
 297                 process->kobj = kfd_alloc_struct(process->kobj);
 298                 if (!process->kobj) {
 299                         pr_warn("Creating procfs kobject failed");
 300                         goto out;
 301                 }
 302                 ret = kobject_init_and_add(process->kobj, &procfs_type,
 303                                            procfs.kobj, "%d",
 304                                            (int)process->lead_thread->pid);
 305                 if (ret) {
 306                         pr_warn("Creating procfs pid directory failed");
 307                         goto out;
 308                 }
 309
 310                 process->attr_pasid.name = "pasid";
 311                 process->attr_pasid.mode = KFD_SYSFS_FILE_MODE;
 312                 sysfs_attr_init(&process->attr_pasid);
 313                 ret = sysfs_create_file(process->kobj, &process->attr_pasid);
 314                 if (ret)
 315                         pr_warn("Creating pasid for pid %d failed",
 316                                         (int)process->lead_thread->pid);
 317         }
 318 out:
 319         mutex_unlock(&kfd_processes_mutex);
 320
 321         return process;
 322 }
 323
 324 struct kfd_process *kfd_get_process(const struct task_struct *thread)
 325 {
 326         struct kfd_process *process;
 327
 328         if (!thread->mm)
 329                 return ERR_PTR(-EINVAL);
 330
 331         /* Only the pthreads threading model is supported. */
 332         if (thread->group_leader->mm != thread->mm)
 333                 return ERR_PTR(-EINVAL);
 334
 335         process = find_process(thread);
 336         if (!process)
 337                 return ERR_PTR(-EINVAL);
 338
 339         return process;
 340 }
 341
 342 static struct kfd_process *find_process_by_mm(const struct mm_struct *mm)
 343 {
 344         struct kfd_process *process;
 345
 346         hash_for_each_possible_rcu(kfd_processes_table, process,
 347                                         kfd_processes, (uintptr_t)mm)
 348                 if (process->mm == mm)
 349                         return process;
 350
 351         return NULL;
 352 }
 353
 354 static struct kfd_process *find_process(const struct task_struct *thread)
 355 {
 356         struct kfd_process *p;
 357         int idx;
 358
 359         idx = srcu_read_lock(&kfd_processes_srcu);
 360         p = find_process_by_mm(thread->mm);
 361         srcu_read_unlock(&kfd_processes_srcu, idx);
 362
 363         return p;
 364 }
 365
 366 void kfd_unref_process(struct kfd_process *p)
 367 {
 368         kref_put(&p->ref, kfd_process_ref_release);
 369 }
 370
 371 static void kfd_process_device_free_bos(struct kfd_process_device *pdd)
 372 {
 373         struct kfd_process *p = pdd->process;
 374         void *mem;
 375         int id;
 376
 377         /*
 378          * Remove all handles from idr and release appropriate
 379          * local memory object
 380          */
 381         idr_for_each_entry(&pdd->alloc_idr, mem, id) {
 382                 struct kfd_process_device *peer_pdd;
 383
 384                 list_for_each_entry(peer_pdd, &p->per_device_data,
 385                                     per_device_list) {
 386                         if (!peer_pdd->vm)
 387                                 continue;
 388                         amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 389                                 peer_pdd->dev->kgd, mem, peer_pdd->vm);
 390                 }
 391
 392                 amdgpu_amdkfd_gpuvm_free_memory_of_gpu(pdd->dev->kgd, mem);
 393                 kfd_process_device_remove_obj_handle(pdd, id);
 394         }
 395 }
 396
 397 static void kfd_process_free_outstanding_kfd_bos(struct kfd_process *p)
 398 {
 399         struct kfd_process_device *pdd;
 400
 401         list_for_each_entry(pdd, &p->per_device_data, per_device_list)
 402                 kfd_process_device_free_bos(pdd);
 403 }
 404
 405 static void kfd_process_destroy_pdds(struct kfd_process *p)
 406 {
 407         struct kfd_process_device *pdd, *temp;
 408
 409         list_for_each_entry_safe(pdd, temp, &p->per_device_data,
 410                                  per_device_list) {
 411                 pr_debug("Releasing pdd (topology id %d) for process (pasid %d)\n",
 412                                 pdd->dev->id, p->pasid);
 413
 414                 if (pdd->drm_file) {
 415                         amdgpu_amdkfd_gpuvm_release_process_vm(
 416                                         pdd->dev->kgd, pdd->vm);
 417                         fput(pdd->drm_file);
 418                 }
 419                 else if (pdd->vm)
 420                         amdgpu_amdkfd_gpuvm_destroy_process_vm(
 421                                 pdd->dev->kgd, pdd->vm);
 422
 423                 list_del(&pdd->per_device_list);
 424
 425                 if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
 426                         free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
 427                                 get_order(KFD_CWSR_TBA_TMA_SIZE));
 428
 429                 kfree(pdd->qpd.doorbell_bitmap);
 430                 idr_destroy(&pdd->alloc_idr);
 431
 432                 kfree(pdd);
 433         }
 434 }
 435
 436 /* No process locking is needed in this function, because the process
 437  * is not findable any more. We must assume that no other thread is
 438  * using it any more, otherwise we couldn't safely free the process
 439  * structure in the end.
 440  */
 441 static void kfd_process_wq_release(struct work_struct *work)
 442 {
 443         struct kfd_process *p = container_of(work, struct kfd_process,
 444                                              release_work);
 445
 446         /* Remove the procfs files */
 447         if (p->kobj) {
 448                 sysfs_remove_file(p->kobj, &p->attr_pasid);
 449                 kobject_del(p->kobj);
 450                 kobject_put(p->kobj);
 451                 p->kobj = NULL;
 452         }
 453
 454         kfd_iommu_unbind_process(p);
 455
 456         kfd_process_free_outstanding_kfd_bos(p);
 457
 458         kfd_process_destroy_pdds(p);
 459         dma_fence_put(p->ef);
 460
 461         kfd_event_free_process(p);
 462
 463         kfd_pasid_free(p->pasid);
 464         kfd_free_process_doorbells(p);
 465
 466         mutex_destroy(&p->mutex);
 467
 468         put_task_struct(p->lead_thread);
 469
 470         kfree(p);
 471 }
 472
 473 static void kfd_process_ref_release(struct kref *ref)
 474 {
 475         struct kfd_process *p = container_of(ref, struct kfd_process, ref);
 476
 477         INIT_WORK(&p->release_work, kfd_process_wq_release);
 478         queue_work(kfd_process_wq, &p->release_work);
 479 }
 480
 481 static void kfd_process_destroy_delayed(struct rcu_head *rcu)
 482 {
 483         struct kfd_process *p = container_of(rcu, struct kfd_process, rcu);
 484
 485         kfd_unref_process(p);
 486 }
 487
 488 static void kfd_process_notifier_release(struct mmu_notifier *mn,
 489                                         struct mm_struct *mm)
 490 {
 491         struct kfd_process *p;
 492         struct kfd_process_device *pdd = NULL;
 493
 494         /*
 495          * The kfd_process structure can not be free because the
 496          * mmu_notifier srcu is read locked
 497          */
 498         p = container_of(mn, struct kfd_process, mmu_notifier);
 499         if (WARN_ON(p->mm != mm))
 500                 return;
 501
 502         mutex_lock(&kfd_processes_mutex);
 503         hash_del_rcu(&p->kfd_processes);
 504         mutex_unlock(&kfd_processes_mutex);
 505         synchronize_srcu(&kfd_processes_srcu);
 506
 507         cancel_delayed_work_sync(&p->eviction_work);
 508         cancel_delayed_work_sync(&p->restore_work);
 509
 510         mutex_lock(&p->mutex);
 511
 512         /* Iterate over all process device data structures and if the
 513          * pdd is in debug mode, we should first force unregistration,
 514          * then we will be able to destroy the queues
 515          */
 516         list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 517                 struct kfd_dev *dev = pdd->dev;
 518
 519                 mutex_lock(kfd_get_dbgmgr_mutex());
 520                 if (dev && dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
 521                         if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
 522                                 kfd_dbgmgr_destroy(dev->dbgmgr);
 523                                 dev->dbgmgr = NULL;
 524                         }
 525                 }
 526                 mutex_unlock(kfd_get_dbgmgr_mutex());
 527         }
 528
 529         kfd_process_dequeue_from_all_devices(p);
 530         pqm_uninit(&p->pqm);
 531
 532         /* Indicate to other users that MM is no longer valid */
 533         p->mm = NULL;
 534
 535         mutex_unlock(&p->mutex);
 536
 537         mmu_notifier_unregister_no_release(&p->mmu_notifier, mm);
 538         mmu_notifier_call_srcu(&p->rcu, &kfd_process_destroy_delayed);
 539 }
 540
 541 static const struct mmu_notifier_ops kfd_process_mmu_notifier_ops = {
 542         .release = kfd_process_notifier_release,
 543 };
 544
 545 static int kfd_process_init_cwsr_apu(struct kfd_process *p, struct file *filep)
 546 {
 547         unsigned long  offset;
 548         struct kfd_process_device *pdd;
 549
 550         list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 551                 struct kfd_dev *dev = pdd->dev;
 552                 struct qcm_process_device *qpd = &pdd->qpd;
 553
 554                 if (!dev->cwsr_enabled || qpd->cwsr_kaddr || qpd->cwsr_base)
 555                         continue;
 556
 557                 offset = (KFD_MMAP_TYPE_RESERVED_MEM | KFD_MMAP_GPU_ID(dev->id))
 558                         << PAGE_SHIFT;
 559                 qpd->tba_addr = (int64_t)vm_mmap(filep, 0,
 560                         KFD_CWSR_TBA_TMA_SIZE, PROT_READ | PROT_EXEC,
 561                         MAP_SHARED, offset);
 562
 563                 if (IS_ERR_VALUE(qpd->tba_addr)) {
 564                         int err = qpd->tba_addr;
 565
 566                         pr_err("Failure to set tba address. error %d.\n", err);
 567                         qpd->tba_addr = 0;
 568                         qpd->cwsr_kaddr = NULL;
 569                         return err;
 570                 }
 571
 572                 memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
 573
 574                 qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
 575                 pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
 576                         qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
 577         }
 578
 579         return 0;
 580 }
 581
 582 static int kfd_process_device_init_cwsr_dgpu(struct kfd_process_device *pdd)
 583 {
 584         struct kfd_dev *dev = pdd->dev;
 585         struct qcm_process_device *qpd = &pdd->qpd;
 586         uint32_t flags = ALLOC_MEM_FLAGS_GTT |
 587                 ALLOC_MEM_FLAGS_NO_SUBSTITUTE | ALLOC_MEM_FLAGS_EXECUTABLE;
 588         void *kaddr;
 589         int ret;
 590
 591         if (!dev->cwsr_enabled || qpd->cwsr_kaddr || !qpd->cwsr_base)
 592                 return 0;
 593
 594         /* cwsr_base is only set for dGPU */
 595         ret = kfd_process_alloc_gpuvm(pdd, qpd->cwsr_base,
 596                                       KFD_CWSR_TBA_TMA_SIZE, flags, &kaddr);
 597         if (ret)
 598                 return ret;
 599
 600         qpd->cwsr_kaddr = kaddr;
 601         qpd->tba_addr = qpd->cwsr_base;
 602
 603         memcpy(qpd->cwsr_kaddr, dev->cwsr_isa, dev->cwsr_isa_size);
 604
 605         qpd->tma_addr = qpd->tba_addr + KFD_CWSR_TMA_OFFSET;
 606         pr_debug("set tba :0x%llx, tma:0x%llx, cwsr_kaddr:%p for pqm.\n",
 607                  qpd->tba_addr, qpd->tma_addr, qpd->cwsr_kaddr);
 608
 609         return 0;
 610 }
 611
 612 static struct kfd_process *create_process(const struct task_struct *thread,
 613                                         struct file *filep)
 614 {
 615         struct kfd_process *process;
 616         int err = -ENOMEM;
 617
 618         process = kzalloc(sizeof(*process), GFP_KERNEL);
 619
 620         if (!process)
 621                 goto err_alloc_process;
 622
 623         process->pasid = kfd_pasid_alloc();
 624         if (process->pasid == 0)
 625                 goto err_alloc_pasid;
 626
 627         if (kfd_alloc_process_doorbells(process) < 0)
 628                 goto err_alloc_doorbells;
 629
 630         kref_init(&process->ref);
 631
 632         mutex_init(&process->mutex);
 633
 634         process->mm = thread->mm;
 635
 636         /* register notifier */
 637         process->mmu_notifier.ops = &kfd_process_mmu_notifier_ops;
 638         err = mmu_notifier_register(&process->mmu_notifier, process->mm);
 639         if (err)
 640                 goto err_mmu_notifier;
 641
 642         hash_add_rcu(kfd_processes_table, &process->kfd_processes,
 643                         (uintptr_t)process->mm);
 644
 645         process->lead_thread = thread->group_leader;
 646         get_task_struct(process->lead_thread);
 647
 648         INIT_LIST_HEAD(&process->per_device_data);
 649
 650         kfd_event_init_process(process);
 651
 652         err = pqm_init(&process->pqm, process);
 653         if (err != 0)
 654                 goto err_process_pqm_init;
 655
 656         /* init process apertures*/
 657         process->is_32bit_user_mode = in_compat_syscall();
 658         err = kfd_init_apertures(process);
 659         if (err != 0)
 660                 goto err_init_apertures;
 661
 662         INIT_DELAYED_WORK(&process->eviction_work, evict_process_worker);
 663         INIT_DELAYED_WORK(&process->restore_work, restore_process_worker);
 664         process->last_restore_timestamp = get_jiffies_64();
 665
 666         err = kfd_process_init_cwsr_apu(process, filep);
 667         if (err)
 668                 goto err_init_cwsr;
 669
 670         return process;
 671
 672 err_init_cwsr:
 673         kfd_process_free_outstanding_kfd_bos(process);
 674         kfd_process_destroy_pdds(process);
 675 err_init_apertures:
 676         pqm_uninit(&process->pqm);
 677 err_process_pqm_init:
 678         hash_del_rcu(&process->kfd_processes);
 679         synchronize_rcu();
 680         mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm);
 681 err_mmu_notifier:
 682         mutex_destroy(&process->mutex);
 683         kfd_free_process_doorbells(process);
 684 err_alloc_doorbells:
 685         kfd_pasid_free(process->pasid);
 686 err_alloc_pasid:
 687         kfree(process);
 688 err_alloc_process:
 689         return ERR_PTR(err);
 690 }
 691
 692 static int init_doorbell_bitmap(struct qcm_process_device *qpd,
 693                         struct kfd_dev *dev)
 694 {
 695         unsigned int i;
 696
 697         if (!KFD_IS_SOC15(dev->device_info->asic_family))
 698                 return 0;
 699
 700         qpd->doorbell_bitmap =
 701                 kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
 702                                      BITS_PER_BYTE), GFP_KERNEL);
 703         if (!qpd->doorbell_bitmap)
 704                 return -ENOMEM;
 705
 706         /* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */
 707         for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {
 708                 if (i >= dev->shared_resources.non_cp_doorbells_start
 709                         && i <= dev->shared_resources.non_cp_doorbells_end) {
 710                         set_bit(i, qpd->doorbell_bitmap);
 711                         set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
 712                                 qpd->doorbell_bitmap);
 713                         pr_debug("reserved doorbell 0x%03x and 0x%03x\n", i,
 714                                 i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET);
 715                 }
 716         }
 717
 718         return 0;
 719 }
 720
 721 struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
 722                                                         struct kfd_process *p)
 723 {
 724         struct kfd_process_device *pdd = NULL;
 725
 726         list_for_each_entry(pdd, &p->per_device_data, per_device_list)
 727                 if (pdd->dev == dev)
 728                         return pdd;
 729
 730         return NULL;
 731 }
 732
 733 struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
 734                                                         struct kfd_process *p)
 735 {
 736         struct kfd_process_device *pdd = NULL;
 737
 738         pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
 739         if (!pdd)
 740                 return NULL;
 741
 742         if (init_doorbell_bitmap(&pdd->qpd, dev)) {
 743                 pr_err("Failed to init doorbell for process\n");
 744                 kfree(pdd);
 745                 return NULL;
 746         }
 747
 748         pdd->dev = dev;
 749         INIT_LIST_HEAD(&pdd->qpd.queues_list);
 750         INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
 751         pdd->qpd.dqm = dev->dqm;
 752         pdd->qpd.pqm = &p->pqm;
 753         pdd->qpd.evicted = 0;
 754         pdd->process = p;
 755         pdd->bound = PDD_UNBOUND;
 756         pdd->already_dequeued = false;
 757         list_add(&pdd->per_device_list, &p->per_device_data);
 758
 759         /* Init idr used for memory handle translation */
 760         idr_init(&pdd->alloc_idr);
 761
 762         return pdd;
 763 }
 764
 765 /**
 766  * kfd_process_device_init_vm - Initialize a VM for a process-device
 767  *
 768  * @pdd: The process-device
 769  * @drm_file: Optional pointer to a DRM file descriptor
 770  *
 771  * If @drm_file is specified, it will be used to acquire the VM from
 772  * that file descriptor. If successful, the @pdd takes ownership of
 773  * the file descriptor.
 774  *
 775  * If @drm_file is NULL, a new VM is created.
 776  *
 777  * Returns 0 on success, -errno on failure.
 778  */
 779 int kfd_process_device_init_vm(struct kfd_process_device *pdd,
 780                                struct file *drm_file)
 781 {
 782         struct kfd_process *p;
 783         struct kfd_dev *dev;
 784         int ret;
 785
 786         if (pdd->vm)
 787                 return drm_file ? -EBUSY : 0;
 788
 789         p = pdd->process;
 790         dev = pdd->dev;
 791
 792         if (drm_file)
 793                 ret = amdgpu_amdkfd_gpuvm_acquire_process_vm(
 794                         dev->kgd, drm_file, p->pasid,
 795                         &pdd->vm, &p->kgd_process_info, &p->ef);
 796         else
 797                 ret = amdgpu_amdkfd_gpuvm_create_process_vm(dev->kgd, p->pasid,
 798                         &pdd->vm, &p->kgd_process_info, &p->ef);
 799         if (ret) {
 800                 pr_err("Failed to create process VM object\n");
 801                 return ret;
 802         }
 803
 804         amdgpu_vm_set_task_info(pdd->vm);
 805
 806         ret = kfd_process_device_reserve_ib_mem(pdd);
 807         if (ret)
 808                 goto err_reserve_ib_mem;
 809         ret = kfd_process_device_init_cwsr_dgpu(pdd);
 810         if (ret)
 811                 goto err_init_cwsr;
 812
 813         pdd->drm_file = drm_file;
 814
 815         return 0;
 816
 817 err_init_cwsr:
 818 err_reserve_ib_mem:
 819         kfd_process_device_free_bos(pdd);
 820         if (!drm_file)
 821                 amdgpu_amdkfd_gpuvm_destroy_process_vm(dev->kgd, pdd->vm);
 822         pdd->vm = NULL;
 823
 824         return ret;
 825 }
 826
 827 /*
 828  * Direct the IOMMU to bind the process (specifically the pasid->mm)
 829  * to the device.
 830  * Unbinding occurs when the process dies or the device is removed.
 831  *
 832  * Assumes that the process lock is held.
 833  */
 834 struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
 835                                                         struct kfd_process *p)
 836 {
 837         struct kfd_process_device *pdd;
 838         int err;
 839
 840         pdd = kfd_get_process_device_data(dev, p);
 841         if (!pdd) {
 842                 pr_err("Process device data doesn't exist\n");
 843                 return ERR_PTR(-ENOMEM);
 844         }
 845
 846         err = kfd_iommu_bind_process_to_device(pdd);
 847         if (err)
 848                 return ERR_PTR(err);
 849
 850         err = kfd_process_device_init_vm(pdd, NULL);
 851         if (err)
 852                 return ERR_PTR(err);
 853
 854         return pdd;
 855 }
 856
 857 struct kfd_process_device *kfd_get_first_process_device_data(
 858                                                 struct kfd_process *p)
 859 {
 860         return list_first_entry(&p->per_device_data,
 861                                 struct kfd_process_device,
 862                                 per_device_list);
 863 }
 864
 865 struct kfd_process_device *kfd_get_next_process_device_data(
 866                                                 struct kfd_process *p,
 867                                                 struct kfd_process_device *pdd)
 868 {
 869         if (list_is_last(&pdd->per_device_list, &p->per_device_data))
 870                 return NULL;
 871         return list_next_entry(pdd, per_device_list);
 872 }
 873
 874 bool kfd_has_process_device_data(struct kfd_process *p)
 875 {
 876         return !(list_empty(&p->per_device_data));
 877 }
 878
 879 /* Create specific handle mapped to mem from process local memory idr
 880  * Assumes that the process lock is held.
 881  */
 882 int kfd_process_device_create_obj_handle(struct kfd_process_device *pdd,
 883                                         void *mem)
 884 {
 885         return idr_alloc(&pdd->alloc_idr, mem, 0, 0, GFP_KERNEL);
 886 }
 887
 888 /* Translate specific handle from process local memory idr
 889  * Assumes that the process lock is held.
 890  */
 891 void *kfd_process_device_translate_handle(struct kfd_process_device *pdd,
 892                                         int handle)
 893 {
 894         if (handle < 0)
 895                 return NULL;
 896
 897         return idr_find(&pdd->alloc_idr, handle);
 898 }
 899
 900 /* Remove specific handle from process local memory idr
 901  * Assumes that the process lock is held.
 902  */
 903 void kfd_process_device_remove_obj_handle(struct kfd_process_device *pdd,
 904                                         int handle)
 905 {
 906         if (handle >= 0)
 907                 idr_remove(&pdd->alloc_idr, handle);
 908 }
 909
 910 /* This increments the process->ref counter. */
 911 struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
 912 {
 913         struct kfd_process *p, *ret_p = NULL;
 914         unsigned int temp;
 915
 916         int idx = srcu_read_lock(&kfd_processes_srcu);
 917
 918         hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
 919                 if (p->pasid == pasid) {
 920                         kref_get(&p->ref);
 921                         ret_p = p;
 922                         break;
 923                 }
 924         }
 925
 926         srcu_read_unlock(&kfd_processes_srcu, idx);
 927
 928         return ret_p;
 929 }
 930
 931 /* This increments the process->ref counter. */
 932 struct kfd_process *kfd_lookup_process_by_mm(const struct mm_struct *mm)
 933 {
 934         struct kfd_process *p;
 935
 936         int idx = srcu_read_lock(&kfd_processes_srcu);
 937
 938         p = find_process_by_mm(mm);
 939         if (p)
 940                 kref_get(&p->ref);
 941
 942         srcu_read_unlock(&kfd_processes_srcu, idx);
 943
 944         return p;
 945 }
 946
 947 /* process_evict_queues - Evict all user queues of a process
 948  *
 949  * Eviction is reference-counted per process-device. This means multiple
 950  * evictions from different sources can be nested safely.
 951  */
 952 int kfd_process_evict_queues(struct kfd_process *p)
 953 {
 954         struct kfd_process_device *pdd;
 955         int r = 0;
 956         unsigned int n_evicted = 0;
 957
 958         list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 959                 r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
 960                                                             &pdd->qpd);
 961                 if (r) {
 962                         pr_err("Failed to evict process queues\n");
 963                         goto fail;
 964                 }
 965                 n_evicted++;
 966         }
 967
 968         return r;
 969
 970 fail:
 971         /* To keep state consistent, roll back partial eviction by
 972          * restoring queues
 973          */
 974         list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 975                 if (n_evicted == 0)
 976                         break;
 977                 if (pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
 978                                                               &pdd->qpd))
 979                         pr_err("Failed to restore queues\n");
 980
 981                 n_evicted--;
 982         }
 983
 984         return r;
 985 }
 986
 987 /* process_restore_queues - Restore all user queues of a process */
 988 int kfd_process_restore_queues(struct kfd_process *p)
 989 {
 990         struct kfd_process_device *pdd;
 991         int r, ret = 0;
 992
 993         list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 994                 r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
 995                                                               &pdd->qpd);
 996                 if (r) {
 997                         pr_err("Failed to restore process queues\n");
 998                         if (!ret)
 999                                 ret = r;
1000                 }
1001         }
1002
1003         return ret;
1004 }
1005
1006 static void evict_process_worker(struct work_struct *work)
1007 {
1008         int ret;
1009         struct kfd_process *p;
1010         struct delayed_work *dwork;
1011
1012         dwork = to_delayed_work(work);
1013
1014         /* Process termination destroys this worker thread. So during the
1015          * lifetime of this thread, kfd_process p will be valid
1016          */
1017         p = container_of(dwork, struct kfd_process, eviction_work);
1018         WARN_ONCE(p->last_eviction_seqno != p->ef->seqno,
1019                   "Eviction fence mismatch\n");
1020
1021         /* Narrow window of overlap between restore and evict work
1022          * item is possible. Once amdgpu_amdkfd_gpuvm_restore_process_bos
1023          * unreserves KFD BOs, it is possible to evicted again. But
1024          * restore has few more steps of finish. So lets wait for any
1025          * previous restore work to complete
1026          */
1027         flush_delayed_work(&p->restore_work);
1028
1029         pr_debug("Started evicting pasid %d\n", p->pasid);
1030         ret = kfd_process_evict_queues(p);
1031         if (!ret) {
1032                 dma_fence_signal(p->ef);
1033                 dma_fence_put(p->ef);
1034                 p->ef = NULL;
1035                 queue_delayed_work(kfd_restore_wq, &p->restore_work,
1036                                 msecs_to_jiffies(PROCESS_RESTORE_TIME_MS));
1037
1038                 pr_debug("Finished evicting pasid %d\n", p->pasid);
1039         } else
1040                 pr_err("Failed to evict queues of pasid %d\n", p->pasid);
1041 }
1042
1043 static void restore_process_worker(struct work_struct *work)
1044 {
1045         struct delayed_work *dwork;
1046         struct kfd_process *p;
1047         struct kfd_process_device *pdd;
1048         int ret = 0;
1049
1050         dwork = to_delayed_work(work);
1051
1052         /* Process termination destroys this worker thread. So during the
1053          * lifetime of this thread, kfd_process p will be valid
1054          */
1055         p = container_of(dwork, struct kfd_process, restore_work);
1056
1057         /* Call restore_process_bos on the first KGD device. This function
1058          * takes care of restoring the whole process including other devices.
1059          * Restore can fail if enough memory is not available. If so,
1060          * reschedule again.
1061          */
1062         pdd = list_first_entry(&p->per_device_data,
1063                                struct kfd_process_device,
1064                                per_device_list);
1065
1066         pr_debug("Started restoring pasid %d\n", p->pasid);
1067
1068         /* Setting last_restore_timestamp before successful restoration.
1069          * Otherwise this would have to be set by KGD (restore_process_bos)
1070          * before KFD BOs are unreserved. If not, the process can be evicted
1071          * again before the timestamp is set.
1072          * If restore fails, the timestamp will be set again in the next
1073          * attempt. This would mean that the minimum GPU quanta would be
1074          * PROCESS_ACTIVE_TIME_MS - (time to execute the following two
1075          * functions)
1076          */
1077
1078         p->last_restore_timestamp = get_jiffies_64();
1079         ret = amdgpu_amdkfd_gpuvm_restore_process_bos(p->kgd_process_info,
1080                                                      &p->ef);
1081         if (ret) {
1082                 pr_debug("Failed to restore BOs of pasid %d, retry after %d ms\n",
1083                          p->pasid, PROCESS_BACK_OFF_TIME_MS);
1084                 ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
1085                                 msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
1086                 WARN(!ret, "reschedule restore work failed\n");
1087                 return;
1088         }
1089
1090         ret = kfd_process_restore_queues(p);
1091         if (!ret)
1092                 pr_debug("Finished restoring pasid %d\n", p->pasid);
1093         else
1094                 pr_err("Failed to restore queues of pasid %d\n", p->pasid);
1095 }
1096
1097 void kfd_suspend_all_processes(void)
1098 {
1099         struct kfd_process *p;
1100         unsigned int temp;
1101         int idx = srcu_read_lock(&kfd_processes_srcu);
1102
1103         hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1104                 cancel_delayed_work_sync(&p->eviction_work);
1105                 cancel_delayed_work_sync(&p->restore_work);
1106
1107                 if (kfd_process_evict_queues(p))
1108                         pr_err("Failed to suspend process %d\n", p->pasid);
1109                 dma_fence_signal(p->ef);
1110                 dma_fence_put(p->ef);
1111                 p->ef = NULL;
1112         }
1113         srcu_read_unlock(&kfd_processes_srcu, idx);
1114 }
1115
1116 int kfd_resume_all_processes(void)
1117 {
1118         struct kfd_process *p;
1119         unsigned int temp;
1120         int ret = 0, idx = srcu_read_lock(&kfd_processes_srcu);
1121
1122         hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1123                 if (!queue_delayed_work(kfd_restore_wq, &p->restore_work, 0)) {
1124                         pr_err("Restore process %d failed during resume\n",
1125                                p->pasid);
1126                         ret = -EFAULT;
1127                 }
1128         }
1129         srcu_read_unlock(&kfd_processes_srcu, idx);
1130         return ret;
1131 }
1132
1133 int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
1134                           struct vm_area_struct *vma)
1135 {
1136         struct kfd_process_device *pdd;
1137         struct qcm_process_device *qpd;
1138
1139         if ((vma->vm_end - vma->vm_start) != KFD_CWSR_TBA_TMA_SIZE) {
1140                 pr_err("Incorrect CWSR mapping size.\n");
1141                 return -EINVAL;
1142         }
1143
1144         pdd = kfd_get_process_device_data(dev, process);
1145         if (!pdd)
1146                 return -EINVAL;
1147         qpd = &pdd->qpd;
1148
1149         qpd->cwsr_kaddr = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1150                                         get_order(KFD_CWSR_TBA_TMA_SIZE));
1151         if (!qpd->cwsr_kaddr) {
1152                 pr_err("Error allocating per process CWSR buffer.\n");
1153                 return -ENOMEM;
1154         }
1155
1156         vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND
1157                 | VM_NORESERVE | VM_DONTDUMP | VM_PFNMAP;
1158         /* Mapping pages to user process */
1159         return remap_pfn_range(vma, vma->vm_start,
1160                                PFN_DOWN(__pa(qpd->cwsr_kaddr)),
1161                                KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
1162 }
1163
1164 void kfd_flush_tlb(struct kfd_process_device *pdd)
1165 {
1166         struct kfd_dev *dev = pdd->dev;
1167         const struct kfd2kgd_calls *f2g = dev->kfd2kgd;
1168
1169         if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) {
1170                 /* Nothing to flush until a VMID is assigned, which
1171                  * only happens when the first queue is created.
1172                  */
1173                 if (pdd->qpd.vmid)
1174                         f2g->invalidate_tlbs_vmid(dev->kgd, pdd->qpd.vmid);
1175         } else {
1176                 f2g->invalidate_tlbs(dev->kgd, pdd->process->pasid);
1177         }
1178 }
1179
1180 #if defined(CONFIG_DEBUG_FS)
1181
1182 int kfd_debugfs_mqds_by_process(struct seq_file *m, void *data)
1183 {
1184         struct kfd_process *p;
1185         unsigned int temp;
1186         int r = 0;
1187
1188         int idx = srcu_read_lock(&kfd_processes_srcu);
1189
1190         hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
1191                 seq_printf(m, "Process %d PASID %d:\n",
1192                            p->lead_thread->tgid, p->pasid);
1193
1194                 mutex_lock(&p->mutex);
1195                 r = pqm_debugfs_mqds(m, &p->pqm);
1196                 mutex_unlock(&p->mutex);
1197
1198                 if (r)
1199                         break;
1200         }
1201
1202         srcu_read_unlock(&kfd_processes_srcu, idx);
1203
1204         return r;
1205 }
1206
1207 #endif
1208