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 /**
  44  * amdgpu_pasid_alloc - Allocate a PASID
  45  * @bits: Maximum width of the PASID in bits, must be at least 1
  46  *
  47  * Allocates a PASID of the given width while keeping smaller PASIDs
  48  * available if possible.
  49  *
  50  * Returns a positive integer on success. Returns %-EINVAL if bits==0.
  51  * Returns %-ENOSPC if no PASID was available. Returns %-ENOMEM on
  52  * memory allocation failure.
  53  */
  54 int amdgpu_pasid_alloc(unsigned int bits)
  55 {
  56         int pasid = -EINVAL;
  57
  58         for (bits = min(bits, 31U); bits > 0; bits--) {
  59                 pasid = ida_simple_get(&amdgpu_pasid_ida,
  60                                        1U << (bits - 1), 1U << bits,
  61                                        GFP_KERNEL);
  62                 if (pasid != -ENOSPC)
  63                         break;
  64         }
  65
  66         return pasid;
  67 }
  68
  69 /**
  70  * amdgpu_pasid_free - Free a PASID
  71  * @pasid: PASID to free
  72  */
  73 void amdgpu_pasid_free(unsigned int pasid)
  74 {
  75         ida_simple_remove(&amdgpu_pasid_ida, pasid);
  76 }
  77
  78 /*
  79  * VMID manager
  80  *
  81  * VMIDs are a per VMHUB identifier for page tables handling.
  82  */
  83
  84 /**
  85  * amdgpu_vmid_had_gpu_reset - check if reset occured since last use
  86  *
  87  * @adev: amdgpu_device pointer
  88  * @id: VMID structure
  89  *
  90  * Check if GPU reset occured since last use of the VMID.
  91  */
  92 bool amdgpu_vmid_had_gpu_reset(struct amdgpu_device *adev,
  93                                struct amdgpu_vmid *id)
  94 {
  95         return id->current_gpu_reset_count !=
  96                 atomic_read(&adev->gpu_reset_counter);
  97 }
  98
  99 /* idr_mgr->lock must be held */
 100 static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
 101                                             struct amdgpu_ring *ring,
 102                                             struct amdgpu_sync *sync,
 103                                             struct dma_fence *fence,
 104                                             struct amdgpu_job *job)
 105 {
 106         struct amdgpu_device *adev = ring->adev;
 107         unsigned vmhub = ring->funcs->vmhub;
 108         uint64_t fence_context = adev->fence_context + ring->idx;
 109         struct amdgpu_vmid *id = vm->reserved_vmid[vmhub];
 110         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 111         struct dma_fence *updates = sync->last_vm_update;
 112         int r = 0;
 113         struct dma_fence *flushed, *tmp;
 114         bool needs_flush = vm->use_cpu_for_update;
 115
 116         flushed  = id->flushed_updates;
 117         if ((amdgpu_vmid_had_gpu_reset(adev, id)) ||
 118             (atomic64_read(&id->owner) != vm->entity.fence_context) ||
 119             (job->vm_pd_addr != id->pd_gpu_addr) ||
 120             (updates && (!flushed || updates->context != flushed->context ||
 121                         dma_fence_is_later(updates, flushed))) ||
 122             (!id->last_flush || (id->last_flush->context != fence_context &&
 123                                  !dma_fence_is_signaled(id->last_flush)))) {
 124                 needs_flush = true;
 125                 /* to prevent one context starved by another context */
 126                 id->pd_gpu_addr = 0;
 127                 tmp = amdgpu_sync_peek_fence(&id->active, ring);
 128                 if (tmp) {
 129                         r = amdgpu_sync_fence(adev, sync, tmp, false);
 130                         return r;
 131                 }
 132         }
 133
 134         /* Good we can use this VMID. Remember this submission as
 135         * user of the VMID.
 136         */
 137         r = amdgpu_sync_fence(ring->adev, &id->active, fence, false);
 138         if (r)
 139                 goto out;
 140
 141         if (updates && (!flushed || updates->context != flushed->context ||
 142                         dma_fence_is_later(updates, flushed))) {
 143                 dma_fence_put(id->flushed_updates);
 144                 id->flushed_updates = dma_fence_get(updates);
 145         }
 146         id->pd_gpu_addr = job->vm_pd_addr;
 147         atomic64_set(&id->owner, vm->entity.fence_context);
 148         job->vm_needs_flush = needs_flush;
 149         if (needs_flush) {
 150                 dma_fence_put(id->last_flush);
 151                 id->last_flush = NULL;
 152         }
 153         job->vmid = id - id_mgr->ids;
 154         trace_amdgpu_vm_grab_id(vm, ring, job);
 155 out:
 156         return r;
 157 }
 158
 159 /**
 160  * amdgpu_vm_grab_id - allocate the next free VMID
 161  *
 162  * @vm: vm to allocate id for
 163  * @ring: ring we want to submit job to
 164  * @sync: sync object where we add dependencies
 165  * @fence: fence protecting ID from reuse
 166  *
 167  * Allocate an id for the vm, adding fences to the sync obj as necessary.
 168  */
 169 int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 170                      struct amdgpu_sync *sync, struct dma_fence *fence,
 171                      struct amdgpu_job *job)
 172 {
 173         struct amdgpu_device *adev = ring->adev;
 174         unsigned vmhub = ring->funcs->vmhub;
 175         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 176         uint64_t fence_context = adev->fence_context + ring->idx;
 177         struct dma_fence *updates = sync->last_vm_update;
 178         struct amdgpu_vmid *id, *idle;
 179         struct dma_fence **fences;
 180         unsigned i;
 181         int r = 0;
 182
 183         mutex_lock(&id_mgr->lock);
 184         if (vm->reserved_vmid[vmhub]) {
 185                 r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync, fence, job);
 186                 mutex_unlock(&id_mgr->lock);
 187                 return r;
 188         }
 189         fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
 190         if (!fences) {
 191                 mutex_unlock(&id_mgr->lock);
 192                 return -ENOMEM;
 193         }
 194         /* Check if we have an idle VMID */
 195         i = 0;
 196         list_for_each_entry(idle, &id_mgr->ids_lru, list) {
 197                 fences[i] = amdgpu_sync_peek_fence(&idle->active, ring);
 198                 if (!fences[i])
 199                         break;
 200                 ++i;
 201         }
 202
 203         /* If we can't find a idle VMID to use, wait till one becomes available */
 204         if (&idle->list == &id_mgr->ids_lru) {
 205                 u64 fence_context = adev->vm_manager.fence_context + ring->idx;
 206                 unsigned seqno = ++adev->vm_manager.seqno[ring->idx];
 207                 struct dma_fence_array *array;
 208                 unsigned j;
 209
 210                 for (j = 0; j < i; ++j)
 211                         dma_fence_get(fences[j]);
 212
 213                 array = dma_fence_array_create(i, fences, fence_context,
 214                                            seqno, true);
 215                 if (!array) {
 216                         for (j = 0; j < i; ++j)
 217                                 dma_fence_put(fences[j]);
 218                         kfree(fences);
 219                         r = -ENOMEM;
 220                         goto error;
 221                 }
 222
 223
 224                 r = amdgpu_sync_fence(ring->adev, sync, &array->base, false);
 225                 dma_fence_put(&array->base);
 226                 if (r)
 227                         goto error;
 228
 229                 mutex_unlock(&id_mgr->lock);
 230                 return 0;
 231
 232         }
 233         kfree(fences);
 234
 235         job->vm_needs_flush = vm->use_cpu_for_update;
 236         /* Check if we can use a VMID already assigned to this VM */
 237         list_for_each_entry_reverse(id, &id_mgr->ids_lru, list) {
 238                 struct dma_fence *flushed;
 239                 bool needs_flush = vm->use_cpu_for_update;
 240
 241                 /* Check all the prerequisites to using this VMID */
 242                 if (amdgpu_vmid_had_gpu_reset(adev, id))
 243                         continue;
 244
 245                 if (atomic64_read(&id->owner) != vm->entity.fence_context)
 246                         continue;
 247
 248                 if (job->vm_pd_addr != id->pd_gpu_addr)
 249                         continue;
 250
 251                 if (!id->last_flush ||
 252                     (id->last_flush->context != fence_context &&
 253                      !dma_fence_is_signaled(id->last_flush)))
 254                         needs_flush = true;
 255
 256                 flushed  = id->flushed_updates;
 257                 if (updates && (!flushed || dma_fence_is_later(updates, flushed)))
 258                         needs_flush = true;
 259
 260                 /* Concurrent flushes are only possible starting with Vega10 */
 261                 if (adev->asic_type < CHIP_VEGA10 && needs_flush)
 262                         continue;
 263
 264                 /* Good we can use this VMID. Remember this submission as
 265                  * user of the VMID.
 266                  */
 267                 r = amdgpu_sync_fence(ring->adev, &id->active, fence, false);
 268                 if (r)
 269                         goto error;
 270
 271                 if (updates && (!flushed || dma_fence_is_later(updates, flushed))) {
 272                         dma_fence_put(id->flushed_updates);
 273                         id->flushed_updates = dma_fence_get(updates);
 274                 }
 275
 276                 if (needs_flush)
 277                         goto needs_flush;
 278                 else
 279                         goto no_flush_needed;
 280
 281         };
 282
 283         /* Still no ID to use? Then use the idle one found earlier */
 284         id = idle;
 285
 286         /* Remember this submission as user of the VMID */
 287         r = amdgpu_sync_fence(ring->adev, &id->active, fence, false);
 288         if (r)
 289                 goto error;
 290
 291         id->pd_gpu_addr = job->vm_pd_addr;
 292         dma_fence_put(id->flushed_updates);
 293         id->flushed_updates = dma_fence_get(updates);
 294         atomic64_set(&id->owner, vm->entity.fence_context);
 295
 296 needs_flush:
 297         job->vm_needs_flush = true;
 298         dma_fence_put(id->last_flush);
 299         id->last_flush = NULL;
 300
 301 no_flush_needed:
 302         list_move_tail(&id->list, &id_mgr->ids_lru);
 303
 304         job->vmid = id - id_mgr->ids;
 305         trace_amdgpu_vm_grab_id(vm, ring, job);
 306
 307 error:
 308         mutex_unlock(&id_mgr->lock);
 309         return r;
 310 }
 311
 312 int amdgpu_vmid_alloc_reserved(struct amdgpu_device *adev,
 313                                struct amdgpu_vm *vm,
 314                                unsigned vmhub)
 315 {
 316         struct amdgpu_vmid_mgr *id_mgr;
 317         struct amdgpu_vmid *idle;
 318         int r = 0;
 319
 320         id_mgr = &adev->vm_manager.id_mgr[vmhub];
 321         mutex_lock(&id_mgr->lock);
 322         if (vm->reserved_vmid[vmhub])
 323                 goto unlock;
 324         if (atomic_inc_return(&id_mgr->reserved_vmid_num) >
 325             AMDGPU_VM_MAX_RESERVED_VMID) {
 326                 DRM_ERROR("Over limitation of reserved vmid\n");
 327                 atomic_dec(&id_mgr->reserved_vmid_num);
 328                 r = -EINVAL;
 329                 goto unlock;
 330         }
 331         /* Select the first entry VMID */
 332         idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vmid, list);
 333         list_del_init(&idle->list);
 334         vm->reserved_vmid[vmhub] = idle;
 335         mutex_unlock(&id_mgr->lock);
 336
 337         return 0;
 338 unlock:
 339         mutex_unlock(&id_mgr->lock);
 340         return r;
 341 }
 342
 343 void amdgpu_vmid_free_reserved(struct amdgpu_device *adev,
 344                                struct amdgpu_vm *vm,
 345                                unsigned vmhub)
 346 {
 347         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 348
 349         mutex_lock(&id_mgr->lock);
 350         if (vm->reserved_vmid[vmhub]) {
 351                 list_add(&vm->reserved_vmid[vmhub]->list,
 352                         &id_mgr->ids_lru);
 353                 vm->reserved_vmid[vmhub] = NULL;
 354                 atomic_dec(&id_mgr->reserved_vmid_num);
 355         }
 356         mutex_unlock(&id_mgr->lock);
 357 }
 358
 359 /**
 360  * amdgpu_vmid_reset - reset VMID to zero
 361  *
 362  * @adev: amdgpu device structure
 363  * @vmid: vmid number to use
 364  *
 365  * Reset saved GDW, GWS and OA to force switch on next flush.
 366  */
 367 void amdgpu_vmid_reset(struct amdgpu_device *adev, unsigned vmhub,
 368                        unsigned vmid)
 369 {
 370         struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 371         struct amdgpu_vmid *id = &id_mgr->ids[vmid];
 372
 373         atomic64_set(&id->owner, 0);
 374         id->gds_base = 0;
 375         id->gds_size = 0;
 376         id->gws_base = 0;
 377         id->gws_size = 0;
 378         id->oa_base = 0;
 379         id->oa_size = 0;
 380 }
 381
 382 /**
 383  * amdgpu_vmid_reset_all - reset VMID to zero
 384  *
 385  * @adev: amdgpu device structure
 386  *
 387  * Reset VMID to force flush on next use
 388  */
 389 void amdgpu_vmid_reset_all(struct amdgpu_device *adev)
 390 {
 391         unsigned i, j;
 392
 393         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 394                 struct amdgpu_vmid_mgr *id_mgr =
 395                         &adev->vm_manager.id_mgr[i];
 396
 397                 for (j = 1; j < id_mgr->num_ids; ++j)
 398                         amdgpu_vmid_reset(adev, i, j);
 399         }
 400 }
 401
 402 /**
 403  * amdgpu_vmid_mgr_init - init the VMID manager
 404  *
 405  * @adev: amdgpu_device pointer
 406  *
 407  * Initialize the VM manager structures
 408  */
 409 void amdgpu_vmid_mgr_init(struct amdgpu_device *adev)
 410 {
 411         unsigned i, j;
 412
 413         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 414                 struct amdgpu_vmid_mgr *id_mgr =
 415                         &adev->vm_manager.id_mgr[i];
 416
 417                 mutex_init(&id_mgr->lock);
 418                 INIT_LIST_HEAD(&id_mgr->ids_lru);
 419                 atomic_set(&id_mgr->reserved_vmid_num, 0);
 420
 421                 /* skip over VMID 0, since it is the system VM */
 422                 for (j = 1; j < id_mgr->num_ids; ++j) {
 423                         amdgpu_vmid_reset(adev, i, j);
 424                         amdgpu_sync_create(&id_mgr->ids[i].active);
 425                         list_add_tail(&id_mgr->ids[j].list, &id_mgr->ids_lru);
 426                 }
 427         }
 428
 429         adev->vm_manager.fence_context =
 430                 dma_fence_context_alloc(AMDGPU_MAX_RINGS);
 431         for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
 432                 adev->vm_manager.seqno[i] = 0;
 433 }
 434
 435 /**
 436  * amdgpu_vmid_mgr_fini - cleanup VM manager
 437  *
 438  * @adev: amdgpu_device pointer
 439  *
 440  * Cleanup the VM manager and free resources.
 441  */
 442 void amdgpu_vmid_mgr_fini(struct amdgpu_device *adev)
 443 {
 444         unsigned i, j;
 445
 446         for (i = 0; i < AMDGPU_MAX_VMHUBS; ++i) {
 447                 struct amdgpu_vmid_mgr *id_mgr =
 448                         &adev->vm_manager.id_mgr[i];
 449
 450                 mutex_destroy(&id_mgr->lock);
 451                 for (j = 0; j < AMDGPU_NUM_VMID; ++j) {
 452                         struct amdgpu_vmid *id = &id_mgr->ids[j];
 453
 454                         amdgpu_sync_free(&id->active);
 455                         dma_fence_put(id->flushed_updates);
 456                         dma_fence_put(id->last_flush);
 457                 }
 458         }
 459 }