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 #include <drm/drmP.h>
  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         unsigned int 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(unsigned int 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 reservation_object *resv,
 108                                unsigned int pasid)
 109 {
 110         struct dma_fence *fence, **fences;
 111         struct amdgpu_pasid_cb *cb;
 112         unsigned count;
 113         int r;
 114
 115         r = reservation_object_get_fences_rcu(resv, NULL, &count, &fences);
 116         if (r)
 117                 goto fallback;
 118
 119         if (count == 0) {
 120                 amdgpu_pasid_free(pasid);
 121                 return;
 122         }
 123
 124         if (count == 1) {
 125                 fence = fences[0];
 126                 kfree(fences);
 127         } else {
 128                 uint64_t context = dma_fence_context_alloc(1);
 129                 struct dma_fence_array *array;
 130
 131                 array = dma_fence_array_create(count, fences, context,
 132                                                1, false);
 133                 if (!array) {
 134                         kfree(fences);
 135                         goto fallback;
 136                 }
 137                 fence = &array->base;
 138         }
 139
 140         cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 141         if (!cb) {
 142                 /* Last resort when we are OOM */
 143                 dma_fence_wait(fence, false);
 144                 dma_fence_put(fence);
 145                 amdgpu_pasid_free(pasid);
 146         } else {
 147                 cb->pasid = pasid;
 148                 if (dma_fence_add_callback(fence, &cb->cb,
 149                                            amdgpu_pasid_free_cb))
 150                         amdgpu_pasid_free_cb(fence, &cb->cb);
 151         }
 152
 153         return;
 154
 155 fallback:
 156         /* Not enough memory for the delayed delete, as last resort
 157          * block for all the fences to complete.
 158          */
 159         reservation_object_wait_timeout_rcu(resv, true, false,
 160                                             MAX_SCHEDULE_TIMEOUT);
 161         amdgpu_pasid_free(pasid);
 162 }
 163
 164 /*
 165  * VMID manager
 166  *
 167  * VMIDs are a per VMHUB identifier for page tables handling.
 168  */
 169
 170 /**
 171  * amdgpu_vmid_had_gpu_reset - check if reset occured since last use
 172  *
 173  * @adev: amdgpu_device pointer
 174  * @id: VMID structure
 175  *
 176  * Check if GPU reset occured since last use of the VMID.
 177  */
 178 bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
 179                                struct amdgpu_vmid *id)
 180 {
 181         return id->current_gpu_reset_count !=
 182                 atomic_read(&adev->gpu_reset_counter);
 183 }
 184
 185 /**
 186  * amdgpu_vm_grab_idle - grab idle VMID
 187  *
 188  * @vm: vm to allocate id for
 189  * @ring: ring we want to submit job to
 190  * @sync: sync object where we add dependencies
 191  * @idle: resulting idle VMID
 192  *
 193  * Try to find an idle VMID, if none is idle add a fence to wait to the sync
 194  * object. Returns -ENOMEM when we are out of memory.
 195  */
 196 static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
 197                                  struct amdgpu_ring *ring,
 198                                  struct amdgpu_sync *sync,
 199                                  struct amdgpu_vmid **idle)
 200 {
 201         struct amdgpu_device *adev = ring->adev;
 202         unsigned vmhub = ring->funcs->vmhub;
 203         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 204         struct dma_fence **fences;
 205         unsigned i;
 206         int r;
 207
 208         if (ring->vmid_wait && !dma_fence_is_signaled(ring->vmid_wait))
 209                 return amdgpu_sync_fence(adev, sync, ring->vmid_wait, false);
 210
 211         fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
 212         if (!fences)
 213                 return -ENOMEM;
 214
 215         /* Check if we have an idle VMID */
 216         i = 0;
 217         list_for_each_entry((*idle), &id_mgr->ids_lru, list) {
 218                 fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, ring);
 219                 if (!fences[i])
 220                         break;
 221                 ++i;
 222         }
 223
 224         /* If we can't find a idle VMID to use, wait till one becomes available */
 225         if (&(*idle)->list == &id_mgr->ids_lru) {
 226                 u64 fence_context = adev->vm_manager.fence_context + ring->idx;
 227                 unsigned seqno = ++adev->vm_manager.seqno[ring->idx];
 228                 struct dma_fence_array *array;
 229                 unsigned j;
 230
 231                 *idle = NULL;
 232                 for (j = 0; j < i; ++j)
 233                         dma_fence_get(fences[j]);
 234
 235                 array = dma_fence_array_create(i, fences, fence_context,
 236                                                seqno, true);
 237                 if (!array) {
 238                         for (j = 0; j < i; ++j)
 239                                 dma_fence_put(fences[j]);
 240                         kfree(fences);
 241                         return -ENOMEM;
 242                 }
 243
 244                 r = amdgpu_sync_fence(adev, sync, &array->base, false);
 245                 dma_fence_put(ring->vmid_wait);
 246                 ring->vmid_wait = &array->base;
 247                 return r;
 248         }
 249         kfree(fences);
 250
 251         return 0;
 252 }
 253
 254 /**
 255  * amdgpu_vm_grab_reserved - try to assign reserved VMID
 256  *
 257  * @vm: vm to allocate id for
 258  * @ring: ring we want to submit job to
 259  * @sync: sync object where we add dependencies
 260  * @fence: fence protecting ID from reuse
 261  * @job: job who wants to use the VMID
 262  *
 263  * Try to assign a reserved VMID.
 264  */
 265 static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
 266                                      struct amdgpu_ring *ring,
 267                                      struct amdgpu_sync *sync,
 268                                      struct dma_fence *fence,
 269                                      struct amdgpu_job *job,
 270                                      struct amdgpu_vmid **id)
 271 {
 272         struct amdgpu_device *adev = ring->adev;
 273         unsigned vmhub = ring->funcs->vmhub;
 274         uint64_t fence_context = adev->fence_context + ring->idx;
 275         struct dma_fence *updates = sync->last_vm_update;
 276         bool needs_flush = vm->use_cpu_for_update;
 277         int r = 0;
 278
 279         *id = vm->reserved_vmid[vmhub];
 280         if (updates && (*id)->flushed_updates &&
 281             updates->context == (*id)->flushed_updates->context &&
 282             !dma_fence_is_later(updates, (*id)->flushed_updates))
 283             updates = NULL;
 284
 285         if ((*id)->owner != vm->entity.fence_context ||
 286             job->vm_pd_addr != (*id)->pd_gpu_addr ||
 287             updates || !(*id)->last_flush ||
 288             ((*id)->last_flush->context != fence_context &&
 289              !dma_fence_is_signaled((*id)->last_flush))) {
 290                 struct dma_fence *tmp;
 291
 292                 /* to prevent one context starved by another context */
 293                 (*id)->pd_gpu_addr = 0;
 294                 tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
 295                 if (tmp) {
 296                         *id = NULL;
 297                         r = amdgpu_sync_fence(adev, sync, tmp, false);
 298                         return r;
 299                 }
 300                 needs_flush = true;
 301         }
 302
 303         /* Good we can use this VMID. Remember this submission as
 304         * user of the VMID.
 305         */
 306         r = amdgpu_sync_fence(ring->adev, &(*id)->active, fence, false);
 307         if (r)
 308                 return r;
 309
 310         if (updates) {
 311                 dma_fence_put((*id)->flushed_updates);
 312                 (*id)->flushed_updates = dma_fence_get(updates);
 313         }
 314         job->vm_needs_flush = needs_flush;
 315         return 0;
 316 }
 317
 318 /**
 319  * amdgpu_vm_grab_used - try to reuse a VMID
 320  *
 321  * @vm: vm to allocate id for
 322  * @ring: ring we want to submit job to
 323  * @sync: sync object where we add dependencies
 324  * @fence: fence protecting ID from reuse
 325  * @job: job who wants to use the VMID
 326  * @id: resulting VMID
 327  *
 328  * Try to reuse a VMID for this submission.
 329  */
 330 static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
 331                                  struct amdgpu_ring *ring,
 332                                  struct amdgpu_sync *sync,
 333                                  struct dma_fence *fence,
 334                                  struct amdgpu_job *job,
 335                                  struct amdgpu_vmid **id)
 336 {
 337         struct amdgpu_device *adev = ring->adev;
 338         unsigned vmhub = ring->funcs->vmhub;
 339         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 340         uint64_t fence_context = adev->fence_context + ring->idx;
 341         struct dma_fence *updates = sync->last_vm_update;
 342         int r;
 343
 344         job->vm_needs_flush = vm->use_cpu_for_update;
 345
 346         /* Check if we can use a VMID already assigned to this VM */
 347         list_for_each_entry_reverse((*id), &id_mgr->ids_lru, list) {
 348                 bool needs_flush = vm->use_cpu_for_update;
 349                 struct dma_fence *flushed;
 350
 351                 /* Check all the prerequisites to using this VMID */
 352                 if ((*id)->owner != vm->entity.fence_context)
 353                         continue;
 354
 355                 if ((*id)->pd_gpu_addr != job->vm_pd_addr)
 356                         continue;
 357
 358                 if (!(*id)->last_flush ||
 359                     ((*id)->last_flush->context != fence_context &&
 360                      !dma_fence_is_signaled((*id)->last_flush)))
 361                         needs_flush = true;
 362
 363                 flushed  = (*id)->flushed_updates;
 364                 if (updates && (!flushed || dma_fence_is_later(updates, flushed)))
 365                         needs_flush = true;
 366
 367                 /* Concurrent flushes are only possible starting with Vega10 and
 368                  * are broken on Navi10 and Navi14.
 369                  */
 370                 if (needs_flush && (adev->asic_type < CHIP_VEGA10 ||
 371                                     adev->asic_type == CHIP_NAVI10))
 372                         continue;
 373
 374                 /* Good, we can use this VMID. Remember this submission as
 375                  * user of the VMID.
 376                  */
 377                 r = amdgpu_sync_fence(ring->adev, &(*id)->active, fence, false);
 378                 if (r)
 379                         return r;
 380
 381                 if (updates && (!flushed || dma_fence_is_later(updates, flushed))) {
 382                         dma_fence_put((*id)->flushed_updates);
 383                         (*id)->flushed_updates = dma_fence_get(updates);
 384                 }
 385
 386                 job->vm_needs_flush |= needs_flush;
 387                 return 0;
 388         }
 389
 390         *id = NULL;
 391         return 0;
 392 }
 393
 394 /**
 395  * amdgpu_vm_grab_id - allocate the next free VMID
 396  *
 397  * @vm: vm to allocate id for
 398  * @ring: ring we want to submit job to
 399  * @sync: sync object where we add dependencies
 400  * @fence: fence protecting ID from reuse
 401  * @job: job who wants to use the VMID
 402  *
 403  * Allocate an id for the vm, adding fences to the sync obj as necessary.
 404  */
 405 int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 406                      struct amdgpu_sync *sync, struct dma_fence *fence,
 407                      struct amdgpu_job *job)
 408 {
 409         struct amdgpu_device *adev = ring->adev;
 410         unsigned vmhub = ring->funcs->vmhub;
 411         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 412         struct amdgpu_vmid *idle = NULL;
 413         struct amdgpu_vmid *id = NULL;
 414         int r = 0;
 415
 416         mutex_lock(&id_mgr->lock);
 417         r = amdgpu_vmid_grab_idle(vm, ring, sync, &idle);
 418         if (r || !idle)
 419                 goto error;
 420
 421         if (vm->reserved_vmid[vmhub]) {
 422                 r = amdgpu_vmid_grab_reserved(vm, ring, sync, fence, job, &id);
 423                 if (r || !id)
 424                         goto error;
 425         } else {
 426                 r = amdgpu_vmid_grab_used(vm, ring, sync, fence, job, &id);
 427                 if (r)
 428                         goto error;
 429
 430                 if (!id) {
 431                         struct dma_fence *updates = sync->last_vm_update;
 432
 433                         /* Still no ID to use? Then use the idle one found earlier */
 434                         id = idle;
 435
 436                         /* Remember this submission as user of the VMID */
 437                         r = amdgpu_sync_fence(ring->adev, &id->active,
 438                                               fence, false);
 439                         if (r)
 440                                 goto error;
 441
 442                         dma_fence_put(id->flushed_updates);
 443                         id->flushed_updates = dma_fence_get(updates);
 444                         job->vm_needs_flush = true;
 445                 }
 446
 447                 list_move_tail(&id->list, &id_mgr->ids_lru);
 448         }
 449
 450         id->pd_gpu_addr = job->vm_pd_addr;
 451         id->owner = vm->entity.fence_context;
 452
 453         if (job->vm_needs_flush) {
 454                 dma_fence_put(id->last_flush);
 455                 id->last_flush = NULL;
 456         }
 457         job->vmid = id - id_mgr->ids;
 458         job->pasid = vm->pasid;
 459         trace_amdgpu_vm_grab_id(vm, ring, job);
 460
 461 error:
 462         mutex_unlock(&id_mgr->lock);
 463         return r;
 464 }
 465
 466 int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
 467                                struct amdgpu_vm *vm,
 468                                unsigned vmhub)
 469 {
 470         struct amdgpu_vmid_mgr *id_mgr;
 471         struct amdgpu_vmid *idle;
 472         int r = 0;
 473
 474         id_mgr = &adev->vm_manager.id_mgr[vmhub];
 475         mutex_lock(&id_mgr->lock);
 476         if (vm->reserved_vmid[vmhub])
 477                 goto unlock;
 478         if (atomic_inc_return(&id_mgr->reserved_vmid_num) >
 479             AMDGPU_VM_MAX_RESERVED_VMID) {
 480                 DRM_ERROR("Over limitation of reserved vmid\n");
 481                 atomic_dec(&id_mgr->reserved_vmid_num);
 482                 r = -EINVAL;
 483                 goto unlock;
 484         }
 485         /* Select the first entry VMID */
 486         idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vmid, list);
 487         list_del_init(&idle->list);
 488         vm->reserved_vmid[vmhub] = idle;
 489         mutex_unlock(&id_mgr->lock);
 490
 491         return 0;
 492 unlock:
 493         mutex_unlock(&id_mgr->lock);
 494         return r;
 495 }
 496
 497 void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
 498                                struct amdgpu_vm *vm,
 499                                unsigned vmhub)
 500 {
 501         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 502
 503         mutex_lock(&id_mgr->lock);
 504         if (vm->reserved_vmid[vmhub]) {
 505                 list_add(&vm->reserved_vmid[vmhub]->list,
 506                         &id_mgr->ids_lru);
 507                 vm->reserved_vmid[vmhub] = NULL;
 508                 atomic_dec(&id_mgr->reserved_vmid_num);
 509         }
 510         mutex_unlock(&id_mgr->lock);
 511 }
 512
 513 /**
 514  * amdgpu_vmid_reset - reset VMID to zero
 515  *
 516  * @adev: amdgpu device structure
 517  * @vmid: vmid number to use
 518  *
 519  * Reset saved GDW, GWS and OA to force switch on next flush.
 520  */
 521 void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
 522                        unsigned vmid)
 523 {
 524         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 525         struct amdgpu_vmid *id = &id_mgr->ids[vmid];
 526
 527         mutex_lock(&id_mgr->lock);
 528         id->owner = 0;
 529         id->gds_base = 0;
 530         id->gds_size = 0;
 531         id->gws_base = 0;
 532         id->gws_size = 0;
 533         id->oa_base = 0;
 534         id->oa_size = 0;
 535         mutex_unlock(&id_mgr->lock);
 536 }
 537
 538 /**
 539  * amdgpu_vmid_reset_all - reset VMID to zero
 540  *
 541  * @adev: amdgpu device structure
 542  *
 543  * Reset VMID to force flush on next use
 544  */
 545 void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
 546 {
 547         unsigned i, j;
 548
 549         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 550                 struct amdgpu_vmid_mgr *id_mgr =
 551                         &adev->vm_manager.id_mgr[i];
 552
 553                 for (j = 1; j < id_mgr->num_ids; ++j)
 554                         amdgpu_vmid_reset(adev, i, j);
 555         }
 556 }
 557
 558 /**
 559  * amdgpu_vmid_mgr_init - init the VMID manager
 560  *
 561  * @adev: amdgpu_device pointer
 562  *
 563  * Initialize the VM manager structures
 564  */
 565 void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
 566 {
 567         unsigned i, j;
 568
 569         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 570                 struct amdgpu_vmid_mgr *id_mgr =
 571                         &adev->vm_manager.id_mgr[i];
 572
 573                 mutex_init(&id_mgr->lock);
 574                 INIT_LIST_HEAD(&id_mgr->ids_lru);
 575                 atomic_set(&id_mgr->reserved_vmid_num, 0);
 576
 577                 /* skip over VMID 0, since it is the system VM */
 578                 for (j = 1; j < id_mgr->num_ids; ++j) {
 579                         amdgpu_vmid_reset(adev, i, j);
 580                         amdgpu_sync_create(&id_mgr->ids[j].active);
 581                         list_add_tail(&id_mgr->ids[j].list, &id_mgr->ids_lru);
 582                 }
 583         }
 584 }
 585
 586 /**
 587  * amdgpu_vmid_mgr_fini - cleanup VM manager
 588  *
 589  * @adev: amdgpu_device pointer
 590  *
 591  * Cleanup the VM manager and free resources.
 592  */
 593 void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
 594 {
 595         unsigned i, j;
 596
 597         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 598                 struct amdgpu_vmid_mgr *id_mgr =
 599                         &adev->vm_manager.id_mgr[i];
 600
 601                 mutex_destroy(&id_mgr->lock);
 602                 for (j = 0; j < AMDGPU_NUM_VMID; ++j) {
 603                         struct amdgpu_vmid *id = &id_mgr->ids[j];
 604
 605                         amdgpu_sync_free(&id->active);
 606                         dma_fence_put(id->flushed_updates);
 607                         dma_fence_put(id->last_flush);
 608                         dma_fence_put(id->pasid_mapping);
 609                 }
 610         }
 611 }