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_alloc_range(&amdgpu_pasid_ida, 1U << (bits - 1),
  66                                         (1U << bits) - 1, GFP_KERNEL);
  67                 if (pasid != -ENOSPC)
  68                         break;
  69         }
  70
  71         if (pasid >= 0)
  72                 trace_amdgpu_pasid_allocated(pasid);
  73
  74         return pasid;
  75 }
  76
  77 /**
  78  * amdgpu_pasid_free - Free a PASID
  79  * @pasid: PASID to free
  80  */
  81 void amdgpu_pasid_free(u32 pasid)
  82 {
  83         trace_amdgpu_pasid_freed(pasid);
  84         ida_free(&amdgpu_pasid_ida, pasid);
  85 }
  86
  87 static void amdgpu_pasid_free_cb(struct dma_fence *fence,
  88                                  struct dma_fence_cb *_cb)
  89 {
  90         struct amdgpu_pasid_cb *cb =
  91                 container_of(_cb, struct amdgpu_pasid_cb, cb);
  92
  93         amdgpu_pasid_free(cb->pasid);
  94         dma_fence_put(fence);
  95         kfree(cb);
  96 }
  97
  98 /**
  99  * amdgpu_pasid_free_delayed - free pasid when fences signal
 100  *
 101  * @resv: reservation object with the fences to wait for
 102  * @pasid: pasid to free
 103  *
 104  * Free the pasid only after all the fences in resv are signaled.
 105  */
 106 void amdgpu_pasid_free_delayed(struct dma_resv *resv,
 107                                u32 pasid)
 108 {
 109         struct amdgpu_pasid_cb *cb;
 110         struct dma_fence *fence;
 111         int r;
 112
 113         r = dma_resv_get_singleton(resv, DMA_RESV_USAGE_BOOKKEEP, &fence);
 114         if (r)
 115                 goto fallback;
 116
 117         if (!fence) {
 118                 amdgpu_pasid_free(pasid);
 119                 return;
 120         }
 121
 122         cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 123         if (!cb) {
 124                 /* Last resort when we are OOM */
 125                 dma_fence_wait(fence, false);
 126                 dma_fence_put(fence);
 127                 amdgpu_pasid_free(pasid);
 128         } else {
 129                 cb->pasid = pasid;
 130                 if (dma_fence_add_callback(fence, &cb->cb,
 131                                            amdgpu_pasid_free_cb))
 132                         amdgpu_pasid_free_cb(fence, &cb->cb);
 133         }
 134
 135         return;
 136
 137 fallback:
 138         /* Not enough memory for the delayed delete, as last resort
 139          * block for all the fences to complete.
 140          */
 141         dma_resv_wait_timeout(resv, DMA_RESV_USAGE_BOOKKEEP,
 142                               false, MAX_SCHEDULE_TIMEOUT);
 143         amdgpu_pasid_free(pasid);
 144 }
 145
 146 /*
 147  * VMID manager
 148  *
 149  * VMIDs are a per VMHUB identifier for page tables handling.
 150  */
 151
 152 /**
 153  * amdgpu_vmid_had_gpu_reset - check if reset occured since last use
 154  *
 155  * @adev: amdgpu_device pointer
 156  * @id: VMID structure
 157  *
 158  * Check if GPU reset occured since last use of the VMID.
 159  */
 160 bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
 161                                struct amdgpu_vmid *id)
 162 {
 163         return id->current_gpu_reset_count !=
 164                 atomic_read(&adev->gpu_reset_counter);
 165 }
 166
 167 /* Check if we need to switch to another set of resources */
 168 static bool amdgpu_vmid_gds_switch_needed(struct amdgpu_vmid *id,
 169                                           struct amdgpu_job *job)
 170 {
 171         return id->gds_base != job->gds_base ||
 172                 id->gds_size != job->gds_size ||
 173                 id->gws_base != job->gws_base ||
 174                 id->gws_size != job->gws_size ||
 175                 id->oa_base != job->oa_base ||
 176                 id->oa_size != job->oa_size;
 177 }
 178
 179 /* Check if the id is compatible with the job */
 180 static bool amdgpu_vmid_compatible(struct amdgpu_vmid *id,
 181                                    struct amdgpu_job *job)
 182 {
 183         return  id->pd_gpu_addr == job->vm_pd_addr &&
 184                 !amdgpu_vmid_gds_switch_needed(id, job);
 185 }
 186
 187 /**
 188  * amdgpu_vmid_grab_idle - grab idle VMID
 189  *
 190  * @ring: ring we want to submit job to
 191  * @idle: resulting idle VMID
 192  * @fence: fence to wait for if no id could be grabbed
 193  *
 194  * Try to find an idle VMID, if none is idle add a fence to wait to the sync
 195  * object. Returns -ENOMEM when we are out of memory.
 196  */
 197 static int amdgpu_vmid_grab_idle(struct amdgpu_ring *ring,
 198                                  struct amdgpu_vmid **idle,
 199                                  struct dma_fence **fence)
 200 {
 201         struct amdgpu_device *adev = ring->adev;
 202         unsigned vmhub = ring->vm_hub;
 203         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 204         struct dma_fence **fences;
 205         unsigned i;
 206
 207         if (!dma_fence_is_signaled(ring->vmid_wait)) {
 208                 *fence = dma_fence_get(ring->vmid_wait);
 209                 return 0;
 210         }
 211
 212         fences = kmalloc_array(id_mgr->num_ids, sizeof(void *), GFP_KERNEL);
 213         if (!fences)
 214                 return -ENOMEM;
 215
 216         /* Check if we have an idle VMID */
 217         i = 0;
 218         list_for_each_entry((*idle), &id_mgr->ids_lru, list) {
 219                 /* Don't use per engine and per process VMID at the same time */
 220                 struct amdgpu_ring *r = adev->vm_manager.concurrent_flush ?
 221                         NULL : ring;
 222
 223                 fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, r);
 224                 if (!fences[i])
 225                         break;
 226                 ++i;
 227         }
 228
 229         /* If we can't find a idle VMID to use, wait till one becomes available */
 230         if (&(*idle)->list == &id_mgr->ids_lru) {
 231                 u64 fence_context = adev->vm_manager.fence_context + ring->idx;
 232                 unsigned seqno = ++adev->vm_manager.seqno[ring->idx];
 233                 struct dma_fence_array *array;
 234                 unsigned j;
 235
 236                 *idle = NULL;
 237                 for (j = 0; j < i; ++j)
 238                         dma_fence_get(fences[j]);
 239
 240                 array = dma_fence_array_create(i, fences, fence_context,
 241                                                seqno, true);
 242                 if (!array) {
 243                         for (j = 0; j < i; ++j)
 244                                 dma_fence_put(fences[j]);
 245                         kfree(fences);
 246                         return -ENOMEM;
 247                 }
 248
 249                 *fence = dma_fence_get(&array->base);
 250                 dma_fence_put(ring->vmid_wait);
 251                 ring->vmid_wait = &array->base;
 252                 return 0;
 253         }
 254         kfree(fences);
 255
 256         return 0;
 257 }
 258
 259 /**
 260  * amdgpu_vmid_grab_reserved - try to assign reserved VMID
 261  *
 262  * @vm: vm to allocate id for
 263  * @ring: ring we want to submit job to
 264  * @job: job who wants to use the VMID
 265  * @id: resulting VMID
 266  * @fence: fence to wait for if no id could be grabbed
 267  *
 268  * Try to assign a reserved VMID.
 269  */
 270 static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
 271                                      struct amdgpu_ring *ring,
 272                                      struct amdgpu_job *job,
 273                                      struct amdgpu_vmid **id,
 274                                      struct dma_fence **fence)
 275 {
 276         struct amdgpu_device *adev = ring->adev;
 277         unsigned vmhub = ring->vm_hub;
 278         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 279         uint64_t fence_context = adev->fence_context + ring->idx;
 280         bool needs_flush = vm->use_cpu_for_update;
 281         uint64_t updates = amdgpu_vm_tlb_seq(vm);
 282         int r;
 283
 284         *id = id_mgr->reserved;
 285         if ((*id)->owner != vm->immediate.fence_context ||
 286             !amdgpu_vmid_compatible(*id, job) ||
 287             (*id)->flushed_updates < updates ||
 288             !(*id)->last_flush ||
 289             ((*id)->last_flush->context != fence_context &&
 290              !dma_fence_is_signaled((*id)->last_flush))) {
 291                 struct dma_fence *tmp;
 292
 293                 /* Don't use per engine and per process VMID at the same time */
 294                 if (adev->vm_manager.concurrent_flush)
 295                         ring = NULL;
 296
 297                 /* to prevent one context starved by another context */
 298                 (*id)->pd_gpu_addr = 0;
 299                 tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
 300                 if (tmp) {
 301                         *id = NULL;
 302                         *fence = dma_fence_get(tmp);
 303                         return 0;
 304                 }
 305                 needs_flush = true;
 306         }
 307
 308         /* Good we can use this VMID. Remember this submission as
 309         * user of the VMID.
 310         */
 311         r = amdgpu_sync_fence(&(*id)->active, &job->base.s_fence->finished);
 312         if (r)
 313                 return r;
 314
 315         job->vm_needs_flush = needs_flush;
 316         job->spm_update_needed = true;
 317         return 0;
 318 }
 319
 320 /**
 321  * amdgpu_vmid_grab_used - try to reuse a VMID
 322  *
 323  * @vm: vm to allocate id for
 324  * @ring: ring we want to submit job to
 325  * @job: job who wants to use the VMID
 326  * @id: resulting VMID
 327  * @fence: fence to wait for if no id could be grabbed
 328  *
 329  * Try to reuse a VMID for this submission.
 330  */
 331 static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
 332                                  struct amdgpu_ring *ring,
 333                                  struct amdgpu_job *job,
 334                                  struct amdgpu_vmid **id,
 335                                  struct dma_fence **fence)
 336 {
 337         struct amdgpu_device *adev = ring->adev;
 338         unsigned vmhub = ring->vm_hub;
 339         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 340         uint64_t fence_context = adev->fence_context + ring->idx;
 341         uint64_t updates = amdgpu_vm_tlb_seq(vm);
 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
 350                 /* Check all the prerequisites to using this VMID */
 351                 if ((*id)->owner != vm->immediate.fence_context)
 352                         continue;
 353
 354                 if (!amdgpu_vmid_compatible(*id, job))
 355                         continue;
 356
 357                 if (!(*id)->last_flush ||
 358                     ((*id)->last_flush->context != fence_context &&
 359                      !dma_fence_is_signaled((*id)->last_flush)))
 360                         needs_flush = true;
 361
 362                 if ((*id)->flushed_updates < updates)
 363                         needs_flush = true;
 364
 365                 if (needs_flush && !adev->vm_manager.concurrent_flush)
 366                         continue;
 367
 368                 /* Good, we can use this VMID. Remember this submission as
 369                  * user of the VMID.
 370                  */
 371                 r = amdgpu_sync_fence(&(*id)->active,
 372                                       &job->base.s_fence->finished);
 373                 if (r)
 374                         return r;
 375
 376                 job->vm_needs_flush |= needs_flush;
 377                 return 0;
 378         }
 379
 380         *id = NULL;
 381         return 0;
 382 }
 383
 384 /**
 385  * amdgpu_vmid_grab - allocate the next free VMID
 386  *
 387  * @vm: vm to allocate id for
 388  * @ring: ring we want to submit job to
 389  * @job: job who wants to use the VMID
 390  * @fence: fence to wait for if no id could be grabbed
 391  *
 392  * Allocate an id for the vm, adding fences to the sync obj as necessary.
 393  */
 394 int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 395                      struct amdgpu_job *job, struct dma_fence **fence)
 396 {
 397         struct amdgpu_device *adev = ring->adev;
 398         unsigned vmhub = ring->vm_hub;
 399         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 400         struct amdgpu_vmid *idle = NULL;
 401         struct amdgpu_vmid *id = NULL;
 402         int r = 0;
 403
 404         mutex_lock(&id_mgr->lock);
 405         r = amdgpu_vmid_grab_idle(ring, &idle, fence);
 406         if (r || !idle)
 407                 goto error;
 408
 409         if (amdgpu_vmid_uses_reserved(vm, vmhub)) {
 410                 r = amdgpu_vmid_grab_reserved(vm, ring, job, &id, fence);
 411                 if (r || !id)
 412                         goto error;
 413         } else {
 414                 r = amdgpu_vmid_grab_used(vm, ring, job, &id, fence);
 415                 if (r)
 416                         goto error;
 417
 418                 if (!id) {
 419                         /* Still no ID to use? Then use the idle one found earlier */
 420                         id = idle;
 421
 422                         /* Remember this submission as user of the VMID */
 423                         r = amdgpu_sync_fence(&id->active,
 424                                               &job->base.s_fence->finished);
 425                         if (r)
 426                                 goto error;
 427
 428                         job->vm_needs_flush = true;
 429                 }
 430
 431                 list_move_tail(&id->list, &id_mgr->ids_lru);
 432         }
 433
 434         job->gds_switch_needed = amdgpu_vmid_gds_switch_needed(id, job);
 435         if (job->vm_needs_flush) {
 436                 id->flushed_updates = amdgpu_vm_tlb_seq(vm);
 437                 dma_fence_put(id->last_flush);
 438                 id->last_flush = NULL;
 439         }
 440         job->vmid = id - id_mgr->ids;
 441         job->pasid = vm->pasid;
 442
 443         id->gds_base = job->gds_base;
 444         id->gds_size = job->gds_size;
 445         id->gws_base = job->gws_base;
 446         id->gws_size = job->gws_size;
 447         id->oa_base = job->oa_base;
 448         id->oa_size = job->oa_size;
 449         id->pd_gpu_addr = job->vm_pd_addr;
 450         id->owner = vm->immediate.fence_context;
 451
 452         trace_amdgpu_vm_grab_id(vm, ring, job);
 453
 454 error:
 455         mutex_unlock(&id_mgr->lock);
 456         return r;
 457 }
 458
 459 /*
 460  * amdgpu_vmid_uses_reserved - check if a VM will use a reserved VMID
 461  * @vm: the VM to check
 462  * @vmhub: the VMHUB which will be used
 463  *
 464  * Returns: True if the VM will use a reserved VMID.
 465  */
 466 bool amdgpu_vmid_uses_reserved(struct amdgpu_vm *vm, unsigned int vmhub)
 467 {
 468         return vm->reserved_vmid[vmhub] ||
 469                 (enforce_isolation && (vmhub == AMDGPU_GFXHUB(0)));
 470 }
 471
 472 int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
 473                                unsigned vmhub)
 474 {
 475         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 476
 477         mutex_lock(&id_mgr->lock);
 478
 479         ++id_mgr->reserved_use_count;
 480         if (!id_mgr->reserved) {
 481                 struct amdgpu_vmid *id;
 482
 483                 id = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vmid,
 484                                       list);
 485                 /* Remove from normal round robin handling */
 486                 list_del_init(&id->list);
 487                 id_mgr->reserved = id;
 488         }
 489
 490         mutex_unlock(&id_mgr->lock);
 491         return 0;
 492 }
 493
 494 void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
 495                                unsigned vmhub)
 496 {
 497         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 498
 499         mutex_lock(&id_mgr->lock);
 500         if (!--id_mgr->reserved_use_count) {
 501                 /* give the reserved ID back to normal round robin */
 502                 list_add(&id_mgr->reserved->list, &id_mgr->ids_lru);
 503                 id_mgr->reserved = NULL;
 504         }
 505
 506         mutex_unlock(&id_mgr->lock);
 507 }
 508
 509 /**
 510  * amdgpu_vmid_reset - reset VMID to zero
 511  *
 512  * @adev: amdgpu device structure
 513  * @vmhub: vmhub type
 514  * @vmid: vmid number to use
 515  *
 516  * Reset saved GDW, GWS and OA to force switch on next flush.
 517  */
 518 void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
 519                        unsigned vmid)
 520 {
 521         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 522         struct amdgpu_vmid *id = &id_mgr->ids[vmid];
 523
 524         mutex_lock(&id_mgr->lock);
 525         id->owner = 0;
 526         id->gds_base = 0;
 527         id->gds_size = 0;
 528         id->gws_base = 0;
 529         id->gws_size = 0;
 530         id->oa_base = 0;
 531         id->oa_size = 0;
 532         mutex_unlock(&id_mgr->lock);
 533 }
 534
 535 /**
 536  * amdgpu_vmid_reset_all - reset VMID to zero
 537  *
 538  * @adev: amdgpu device structure
 539  *
 540  * Reset VMID to force flush on next use
 541  */
 542 void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
 543 {
 544         unsigned i, j;
 545
 546         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 547                 struct amdgpu_vmid_mgr *id_mgr =
 548                         &adev->vm_manager.id_mgr[i];
 549
 550                 for (j = 1; j < id_mgr->num_ids; ++j)
 551                         amdgpu_vmid_reset(adev, i, j);
 552         }
 553 }
 554
 555 /**
 556  * amdgpu_vmid_mgr_init - init the VMID manager
 557  *
 558  * @adev: amdgpu_device pointer
 559  *
 560  * Initialize the VM manager structures
 561  */
 562 void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
 563 {
 564         unsigned i, j;
 565
 566         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 567                 struct amdgpu_vmid_mgr *id_mgr =
 568                         &adev->vm_manager.id_mgr[i];
 569
 570                 mutex_init(&id_mgr->lock);
 571                 INIT_LIST_HEAD(&id_mgr->ids_lru);
 572                 id_mgr->reserved_use_count = 0;
 573
 574                 /* manage only VMIDs not used by KFD */
 575                 id_mgr->num_ids = adev->vm_manager.first_kfd_vmid;
 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         /* alloc a default reserved vmid to enforce isolation */
 585         if (enforce_isolation)
 586                 amdgpu_vmid_alloc_reserved(adev, AMDGPU_GFXHUB(0));
 587
 588 }
 589
 590 /**
 591  * amdgpu_vmid_mgr_fini - cleanup VM manager
 592  *
 593  * @adev: amdgpu_device pointer
 594  *
 595  * Cleanup the VM manager and free resources.
 596  */
 597 void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
 598 {
 599         unsigned i, j;
 600
 601         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 602                 struct amdgpu_vmid_mgr *id_mgr =
 603                         &adev->vm_manager.id_mgr[i];
 604
 605                 mutex_destroy(&id_mgr->lock);
 606                 for (j = 0; j < AMDGPU_NUM_VMID; ++j) {
 607                         struct amdgpu_vmid *id = &id_mgr->ids[j];
 608
 609                         amdgpu_sync_free(&id->active);
 610                         dma_fence_put(id->last_flush);
 611                         dma_fence_put(id->pasid_mapping);
 612                 }
 613         }
 614 }