drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c

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