drivers/gpu/drm/nouveau/nouveau_dmem.c

   1 /*
   2  * Copyright 2018 Red Hat 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 #include "nouveau_dmem.h"
  23 #include "nouveau_drv.h"
  24 #include "nouveau_chan.h"
  25 #include "nouveau_dma.h"
  26 #include "nouveau_mem.h"
  27 #include "nouveau_bo.h"
  28 #include "nouveau_svm.h"
  29
  30 #include <nvif/class.h>
  31 #include <nvif/object.h>
  32 #include <nvif/push906f.h>
  33 #include <nvif/if000c.h>
  34 #include <nvif/if500b.h>
  35 #include <nvif/if900b.h>
  36 #include <nvif/if000c.h>
  37
  38 #include <nvhw/class/cla0b5.h>
  39
  40 #include <linux/sched/mm.h>
  41 #include <linux/hmm.h>
  42 #include <linux/memremap.h>
  43 #include <linux/migrate.h>
  44
  45 /*
  46  * FIXME: this is ugly right now we are using TTM to allocate vram and we pin
  47  * it in vram while in use. We likely want to overhaul memory management for
  48  * nouveau to be more page like (not necessarily with system page size but a
  49  * bigger page size) at lowest level and have some shim layer on top that would
  50  * provide the same functionality as TTM.
  51  */
  52 #define DMEM_CHUNK_SIZE (2UL << 20)
  53 #define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT)
  54
  55 enum nouveau_aper {
  56         NOUVEAU_APER_VIRT,
  57         NOUVEAU_APER_VRAM,
  58         NOUVEAU_APER_HOST,
  59 };
  60
  61 typedef int (*nouveau_migrate_copy_t)(struct nouveau_drm *drm, u64 npages,
  62                                       enum nouveau_aper, u64 dst_addr,
  63                                       enum nouveau_aper, u64 src_addr);
  64 typedef int (*nouveau_clear_page_t)(struct nouveau_drm *drm, u32 length,
  65                                       enum nouveau_aper, u64 dst_addr);
  66
  67 struct nouveau_dmem_chunk {
  68         struct list_head list;
  69         struct nouveau_bo *bo;
  70         struct nouveau_drm *drm;
  71         unsigned long callocated;
  72         struct dev_pagemap pagemap;
  73 };
  74
  75 struct nouveau_dmem_migrate {
  76         nouveau_migrate_copy_t copy_func;
  77         nouveau_clear_page_t clear_func;
  78         struct nouveau_channel *chan;
  79 };
  80
  81 struct nouveau_dmem {
  82         struct nouveau_drm *drm;
  83         struct nouveau_dmem_migrate migrate;
  84         struct list_head chunks;
  85         struct mutex mutex;
  86         struct page *free_pages;
  87         spinlock_t lock;
  88 };
  89
  90 static struct nouveau_dmem_chunk *nouveau_page_to_chunk(struct page *page)
  91 {
  92         return container_of(page->pgmap, struct nouveau_dmem_chunk, pagemap);
  93 }
  94
  95 static struct nouveau_drm *page_to_drm(struct page *page)
  96 {
  97         struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
  98
  99         return chunk->drm;
 100 }
 101
 102 unsigned long nouveau_dmem_page_addr(struct page *page)
 103 {
 104         struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
 105         unsigned long off = (page_to_pfn(page) << PAGE_SHIFT) -
 106                                 chunk->pagemap.range.start;
 107
 108         return chunk->bo->offset + off;
 109 }
 110
 111 static void nouveau_dmem_page_free(struct page *page)
 112 {
 113         struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
 114         struct nouveau_dmem *dmem = chunk->drm->dmem;
 115
 116         spin_lock(&dmem->lock);
 117         page->zone_device_data = dmem->free_pages;
 118         dmem->free_pages = page;
 119
 120         WARN_ON(!chunk->callocated);
 121         chunk->callocated--;
 122         /*
 123          * FIXME when chunk->callocated reach 0 we should add the chunk to
 124          * a reclaim list so that it can be freed in case of memory pressure.
 125          */
 126         spin_unlock(&dmem->lock);
 127 }
 128
 129 static void nouveau_dmem_fence_done(struct nouveau_fence **fence)
 130 {
 131         if (fence) {
 132                 nouveau_fence_wait(*fence, true, false);
 133                 nouveau_fence_unref(fence);
 134         } else {
 135                 /*
 136                  * FIXME wait for channel to be IDLE before calling finalizing
 137                  * the hmem object.
 138                  */
 139         }
 140 }
 141
 142 static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
 143                 struct vm_fault *vmf, struct migrate_vma *args,
 144                 dma_addr_t *dma_addr)
 145 {
 146         struct device *dev = drm->dev->dev;
 147         struct page *dpage, *spage;
 148         struct nouveau_svmm *svmm;
 149
 150         spage = migrate_pfn_to_page(args->src[0]);
 151         if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
 152                 return 0;
 153
 154         dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address);
 155         if (!dpage)
 156                 return VM_FAULT_SIGBUS;
 157         lock_page(dpage);
 158
 159         *dma_addr = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 160         if (dma_mapping_error(dev, *dma_addr))
 161                 goto error_free_page;
 162
 163         svmm = spage->zone_device_data;
 164         mutex_lock(&svmm->mutex);
 165         nouveau_svmm_invalidate(svmm, args->start, args->end);
 166         if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
 167                         NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
 168                 goto error_dma_unmap;
 169         mutex_unlock(&svmm->mutex);
 170
 171         args->dst[0] = migrate_pfn(page_to_pfn(dpage));
 172         return 0;
 173
 174 error_dma_unmap:
 175         mutex_unlock(&svmm->mutex);
 176         dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 177 error_free_page:
 178         __free_page(dpage);
 179         return VM_FAULT_SIGBUS;
 180 }
 181
 182 static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
 183 {
 184         struct nouveau_drm *drm = page_to_drm(vmf->page);
 185         struct nouveau_dmem *dmem = drm->dmem;
 186         struct nouveau_fence *fence;
 187         unsigned long src = 0, dst = 0;
 188         dma_addr_t dma_addr = 0;
 189         vm_fault_t ret;
 190         struct migrate_vma args = {
 191                 .vma            = vmf->vma,
 192                 .start          = vmf->address,
 193                 .end            = vmf->address + PAGE_SIZE,
 194                 .src            = &src,
 195                 .dst            = &dst,
 196                 .pgmap_owner    = drm->dev,
 197                 .flags          = MIGRATE_VMA_SELECT_DEVICE_PRIVATE,
 198         };
 199
 200         /*
 201          * FIXME what we really want is to find some heuristic to migrate more
 202          * than just one page on CPU fault. When such fault happens it is very
 203          * likely that more surrounding page will CPU fault too.
 204          */
 205         if (migrate_vma_setup(&args) < 0)
 206                 return VM_FAULT_SIGBUS;
 207         if (!args.cpages)
 208                 return 0;
 209
 210         ret = nouveau_dmem_fault_copy_one(drm, vmf, &args, &dma_addr);
 211         if (ret || dst == 0)
 212                 goto done;
 213
 214         nouveau_fence_new(dmem->migrate.chan, false, &fence);
 215         migrate_vma_pages(&args);
 216         nouveau_dmem_fence_done(&fence);
 217         dma_unmap_page(drm->dev->dev, dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 218 done:
 219         migrate_vma_finalize(&args);
 220         return ret;
 221 }
 222
 223 static const struct dev_pagemap_ops nouveau_dmem_pagemap_ops = {
 224         .page_free              = nouveau_dmem_page_free,
 225         .migrate_to_ram         = nouveau_dmem_migrate_to_ram,
 226 };
 227
 228 static int
 229 nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage)
 230 {
 231         struct nouveau_dmem_chunk *chunk;
 232         struct resource *res;
 233         struct page *page;
 234         void *ptr;
 235         unsigned long i, pfn_first;
 236         int ret;
 237
 238         chunk = kzalloc(sizeof(*chunk), GFP_KERNEL);
 239         if (chunk == NULL) {
 240                 ret = -ENOMEM;
 241                 goto out;
 242         }
 243
 244         /* Allocate unused physical address space for device private pages. */
 245         res = request_free_mem_region(&iomem_resource, DMEM_CHUNK_SIZE,
 246                                       "nouveau_dmem");
 247         if (IS_ERR(res)) {
 248                 ret = PTR_ERR(res);
 249                 goto out_free;
 250         }
 251
 252         chunk->drm = drm;
 253         chunk->pagemap.type = MEMORY_DEVICE_PRIVATE;
 254         chunk->pagemap.range.start = res->start;
 255         chunk->pagemap.range.end = res->end;
 256         chunk->pagemap.nr_range = 1;
 257         chunk->pagemap.ops = &nouveau_dmem_pagemap_ops;
 258         chunk->pagemap.owner = drm->dev;
 259
 260         ret = nouveau_bo_new(&drm->client, DMEM_CHUNK_SIZE, 0,
 261                              NOUVEAU_GEM_DOMAIN_VRAM, 0, 0, NULL, NULL,
 262                              &chunk->bo);
 263         if (ret)
 264                 goto out_release;
 265
 266         ret = nouveau_bo_pin(chunk->bo, NOUVEAU_GEM_DOMAIN_VRAM, false);
 267         if (ret)
 268                 goto out_bo_free;
 269
 270         ptr = memremap_pages(&chunk->pagemap, numa_node_id());
 271         if (IS_ERR(ptr)) {
 272                 ret = PTR_ERR(ptr);
 273                 goto out_bo_unpin;
 274         }
 275
 276         mutex_lock(&drm->dmem->mutex);
 277         list_add(&chunk->list, &drm->dmem->chunks);
 278         mutex_unlock(&drm->dmem->mutex);
 279
 280         pfn_first = chunk->pagemap.range.start >> PAGE_SHIFT;
 281         page = pfn_to_page(pfn_first);
 282         spin_lock(&drm->dmem->lock);
 283         for (i = 0; i < DMEM_CHUNK_NPAGES - 1; ++i, ++page) {
 284                 page->zone_device_data = drm->dmem->free_pages;
 285                 drm->dmem->free_pages = page;
 286         }
 287         *ppage = page;
 288         chunk->callocated++;
 289         spin_unlock(&drm->dmem->lock);
 290
 291         NV_INFO(drm, "DMEM: registered %ldMB of device memory\n",
 292                 DMEM_CHUNK_SIZE >> 20);
 293
 294         return 0;
 295
 296 out_bo_unpin:
 297         nouveau_bo_unpin(chunk->bo);
 298 out_bo_free:
 299         nouveau_bo_ref(NULL, &chunk->bo);
 300 out_release:
 301         release_mem_region(chunk->pagemap.range.start, range_len(&chunk->pagemap.range));
 302 out_free:
 303         kfree(chunk);
 304 out:
 305         return ret;
 306 }
 307
 308 static struct page *
 309 nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
 310 {
 311         struct nouveau_dmem_chunk *chunk;
 312         struct page *page = NULL;
 313         int ret;
 314
 315         spin_lock(&drm->dmem->lock);
 316         if (drm->dmem->free_pages) {
 317                 page = drm->dmem->free_pages;
 318                 drm->dmem->free_pages = page->zone_device_data;
 319                 chunk = nouveau_page_to_chunk(page);
 320                 chunk->callocated++;
 321                 spin_unlock(&drm->dmem->lock);
 322         } else {
 323                 spin_unlock(&drm->dmem->lock);
 324                 ret = nouveau_dmem_chunk_alloc(drm, &page);
 325                 if (ret)
 326                         return NULL;
 327         }
 328
 329         lock_page(page);
 330         return page;
 331 }
 332
 333 static void
 334 nouveau_dmem_page_free_locked(struct nouveau_drm *drm, struct page *page)
 335 {
 336         unlock_page(page);
 337         put_page(page);
 338 }
 339
 340 void
 341 nouveau_dmem_resume(struct nouveau_drm *drm)
 342 {
 343         struct nouveau_dmem_chunk *chunk;
 344         int ret;
 345
 346         if (drm->dmem == NULL)
 347                 return;
 348
 349         mutex_lock(&drm->dmem->mutex);
 350         list_for_each_entry(chunk, &drm->dmem->chunks, list) {
 351                 ret = nouveau_bo_pin(chunk->bo, NOUVEAU_GEM_DOMAIN_VRAM, false);
 352                 /* FIXME handle pin failure */
 353                 WARN_ON(ret);
 354         }
 355         mutex_unlock(&drm->dmem->mutex);
 356 }
 357
 358 void
 359 nouveau_dmem_suspend(struct nouveau_drm *drm)
 360 {
 361         struct nouveau_dmem_chunk *chunk;
 362
 363         if (drm->dmem == NULL)
 364                 return;
 365
 366         mutex_lock(&drm->dmem->mutex);
 367         list_for_each_entry(chunk, &drm->dmem->chunks, list)
 368                 nouveau_bo_unpin(chunk->bo);
 369         mutex_unlock(&drm->dmem->mutex);
 370 }
 371
 372 void
 373 nouveau_dmem_fini(struct nouveau_drm *drm)
 374 {
 375         struct nouveau_dmem_chunk *chunk, *tmp;
 376
 377         if (drm->dmem == NULL)
 378                 return;
 379
 380         mutex_lock(&drm->dmem->mutex);
 381
 382         list_for_each_entry_safe(chunk, tmp, &drm->dmem->chunks, list) {
 383                 nouveau_bo_unpin(chunk->bo);
 384                 nouveau_bo_ref(NULL, &chunk->bo);
 385                 list_del(&chunk->list);
 386                 memunmap_pages(&chunk->pagemap);
 387                 release_mem_region(chunk->pagemap.range.start,
 388                                    range_len(&chunk->pagemap.range));
 389                 kfree(chunk);
 390         }
 391
 392         mutex_unlock(&drm->dmem->mutex);
 393 }
 394
 395 static int
 396 nvc0b5_migrate_copy(struct nouveau_drm *drm, u64 npages,
 397                     enum nouveau_aper dst_aper, u64 dst_addr,
 398                     enum nouveau_aper src_aper, u64 src_addr)
 399 {
 400         struct nvif_push *push = drm->dmem->migrate.chan->chan.push;
 401         u32 launch_dma = 0;
 402         int ret;
 403
 404         ret = PUSH_WAIT(push, 13);
 405         if (ret)
 406                 return ret;
 407
 408         if (src_aper != NOUVEAU_APER_VIRT) {
 409                 switch (src_aper) {
 410                 case NOUVEAU_APER_VRAM:
 411                         PUSH_IMMD(push, NVA0B5, SET_SRC_PHYS_MODE,
 412                                   NVDEF(NVA0B5, SET_SRC_PHYS_MODE, TARGET, LOCAL_FB));
 413                         break;
 414                 case NOUVEAU_APER_HOST:
 415                         PUSH_IMMD(push, NVA0B5, SET_SRC_PHYS_MODE,
 416                                   NVDEF(NVA0B5, SET_SRC_PHYS_MODE, TARGET, COHERENT_SYSMEM));
 417                         break;
 418                 default:
 419                         return -EINVAL;
 420                 }
 421
 422                 launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, SRC_TYPE, PHYSICAL);
 423         }
 424
 425         if (dst_aper != NOUVEAU_APER_VIRT) {
 426                 switch (dst_aper) {
 427                 case NOUVEAU_APER_VRAM:
 428                         PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
 429                                   NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, LOCAL_FB));
 430                         break;
 431                 case NOUVEAU_APER_HOST:
 432                         PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
 433                                   NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, COHERENT_SYSMEM));
 434                         break;
 435                 default:
 436                         return -EINVAL;
 437                 }
 438
 439                 launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, DST_TYPE, PHYSICAL);
 440         }
 441
 442         PUSH_MTHD(push, NVA0B5, OFFSET_IN_UPPER,
 443                   NVVAL(NVA0B5, OFFSET_IN_UPPER, UPPER, upper_32_bits(src_addr)),
 444
 445                                 OFFSET_IN_LOWER, lower_32_bits(src_addr),
 446
 447                                 OFFSET_OUT_UPPER,
 448                   NVVAL(NVA0B5, OFFSET_OUT_UPPER, UPPER, upper_32_bits(dst_addr)),
 449
 450                                 OFFSET_OUT_LOWER, lower_32_bits(dst_addr),
 451                                 PITCH_IN, PAGE_SIZE,
 452                                 PITCH_OUT, PAGE_SIZE,
 453                                 LINE_LENGTH_IN, PAGE_SIZE,
 454                                 LINE_COUNT, npages);
 455
 456         PUSH_MTHD(push, NVA0B5, LAUNCH_DMA, launch_dma |
 457                   NVDEF(NVA0B5, LAUNCH_DMA, DATA_TRANSFER_TYPE, NON_PIPELINED) |
 458                   NVDEF(NVA0B5, LAUNCH_DMA, FLUSH_ENABLE, TRUE) |
 459                   NVDEF(NVA0B5, LAUNCH_DMA, SEMAPHORE_TYPE, NONE) |
 460                   NVDEF(NVA0B5, LAUNCH_DMA, INTERRUPT_TYPE, NONE) |
 461                   NVDEF(NVA0B5, LAUNCH_DMA, SRC_MEMORY_LAYOUT, PITCH) |
 462                   NVDEF(NVA0B5, LAUNCH_DMA, DST_MEMORY_LAYOUT, PITCH) |
 463                   NVDEF(NVA0B5, LAUNCH_DMA, MULTI_LINE_ENABLE, TRUE) |
 464                   NVDEF(NVA0B5, LAUNCH_DMA, REMAP_ENABLE, FALSE) |
 465                   NVDEF(NVA0B5, LAUNCH_DMA, BYPASS_L2, USE_PTE_SETTING));
 466         return 0;
 467 }
 468
 469 static int
 470 nvc0b5_migrate_clear(struct nouveau_drm *drm, u32 length,
 471                      enum nouveau_aper dst_aper, u64 dst_addr)
 472 {
 473         struct nvif_push *push = drm->dmem->migrate.chan->chan.push;
 474         u32 launch_dma = 0;
 475         int ret;
 476
 477         ret = PUSH_WAIT(push, 12);
 478         if (ret)
 479                 return ret;
 480
 481         switch (dst_aper) {
 482         case NOUVEAU_APER_VRAM:
 483                 PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
 484                           NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, LOCAL_FB));
 485                 break;
 486         case NOUVEAU_APER_HOST:
 487                 PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
 488                           NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, COHERENT_SYSMEM));
 489                 break;
 490         default:
 491                 return -EINVAL;
 492         }
 493
 494         launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, DST_TYPE, PHYSICAL);
 495
 496         PUSH_MTHD(push, NVA0B5, SET_REMAP_CONST_A, 0,
 497                                 SET_REMAP_CONST_B, 0,
 498
 499                                 SET_REMAP_COMPONENTS,
 500                   NVDEF(NVA0B5, SET_REMAP_COMPONENTS, DST_X, CONST_A) |
 501                   NVDEF(NVA0B5, SET_REMAP_COMPONENTS, DST_Y, CONST_B) |
 502                   NVDEF(NVA0B5, SET_REMAP_COMPONENTS, COMPONENT_SIZE, FOUR) |
 503                   NVDEF(NVA0B5, SET_REMAP_COMPONENTS, NUM_DST_COMPONENTS, TWO));
 504
 505         PUSH_MTHD(push, NVA0B5, OFFSET_OUT_UPPER,
 506                   NVVAL(NVA0B5, OFFSET_OUT_UPPER, UPPER, upper_32_bits(dst_addr)),
 507
 508                                 OFFSET_OUT_LOWER, lower_32_bits(dst_addr));
 509
 510         PUSH_MTHD(push, NVA0B5, LINE_LENGTH_IN, length >> 3);
 511
 512         PUSH_MTHD(push, NVA0B5, LAUNCH_DMA, launch_dma |
 513                   NVDEF(NVA0B5, LAUNCH_DMA, DATA_TRANSFER_TYPE, NON_PIPELINED) |
 514                   NVDEF(NVA0B5, LAUNCH_DMA, FLUSH_ENABLE, TRUE) |
 515                   NVDEF(NVA0B5, LAUNCH_DMA, SEMAPHORE_TYPE, NONE) |
 516                   NVDEF(NVA0B5, LAUNCH_DMA, INTERRUPT_TYPE, NONE) |
 517                   NVDEF(NVA0B5, LAUNCH_DMA, SRC_MEMORY_LAYOUT, PITCH) |
 518                   NVDEF(NVA0B5, LAUNCH_DMA, DST_MEMORY_LAYOUT, PITCH) |
 519                   NVDEF(NVA0B5, LAUNCH_DMA, MULTI_LINE_ENABLE, FALSE) |
 520                   NVDEF(NVA0B5, LAUNCH_DMA, REMAP_ENABLE, TRUE) |
 521                   NVDEF(NVA0B5, LAUNCH_DMA, BYPASS_L2, USE_PTE_SETTING));
 522         return 0;
 523 }
 524
 525 static int
 526 nouveau_dmem_migrate_init(struct nouveau_drm *drm)
 527 {
 528         switch (drm->ttm.copy.oclass) {
 529         case PASCAL_DMA_COPY_A:
 530         case PASCAL_DMA_COPY_B:
 531         case  VOLTA_DMA_COPY_A:
 532         case TURING_DMA_COPY_A:
 533                 drm->dmem->migrate.copy_func = nvc0b5_migrate_copy;
 534                 drm->dmem->migrate.clear_func = nvc0b5_migrate_clear;
 535                 drm->dmem->migrate.chan = drm->ttm.chan;
 536                 return 0;
 537         default:
 538                 break;
 539         }
 540         return -ENODEV;
 541 }
 542
 543 void
 544 nouveau_dmem_init(struct nouveau_drm *drm)
 545 {
 546         int ret;
 547
 548         /* This only make sense on PASCAL or newer */
 549         if (drm->client.device.info.family < NV_DEVICE_INFO_V0_PASCAL)
 550                 return;
 551
 552         if (!(drm->dmem = kzalloc(sizeof(*drm->dmem), GFP_KERNEL)))
 553                 return;
 554
 555         drm->dmem->drm = drm;
 556         mutex_init(&drm->dmem->mutex);
 557         INIT_LIST_HEAD(&drm->dmem->chunks);
 558         mutex_init(&drm->dmem->mutex);
 559         spin_lock_init(&drm->dmem->lock);
 560
 561         /* Initialize migration dma helpers before registering memory */
 562         ret = nouveau_dmem_migrate_init(drm);
 563         if (ret) {
 564                 kfree(drm->dmem);
 565                 drm->dmem = NULL;
 566         }
 567 }
 568
 569 static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
 570                 struct nouveau_svmm *svmm, unsigned long src,
 571                 dma_addr_t *dma_addr, u64 *pfn)
 572 {
 573         struct device *dev = drm->dev->dev;
 574         struct page *dpage, *spage;
 575         unsigned long paddr;
 576
 577         spage = migrate_pfn_to_page(src);
 578         if (!(src & MIGRATE_PFN_MIGRATE))
 579                 goto out;
 580
 581         dpage = nouveau_dmem_page_alloc_locked(drm);
 582         if (!dpage)
 583                 goto out;
 584
 585         paddr = nouveau_dmem_page_addr(dpage);
 586         if (spage) {
 587                 *dma_addr = dma_map_page(dev, spage, 0, page_size(spage),
 588                                          DMA_BIDIRECTIONAL);
 589                 if (dma_mapping_error(dev, *dma_addr))
 590                         goto out_free_page;
 591                 if (drm->dmem->migrate.copy_func(drm, 1,
 592                         NOUVEAU_APER_VRAM, paddr, NOUVEAU_APER_HOST, *dma_addr))
 593                         goto out_dma_unmap;
 594         } else {
 595                 *dma_addr = DMA_MAPPING_ERROR;
 596                 if (drm->dmem->migrate.clear_func(drm, page_size(dpage),
 597                         NOUVEAU_APER_VRAM, paddr))
 598                         goto out_free_page;
 599         }
 600
 601         dpage->zone_device_data = svmm;
 602         *pfn = NVIF_VMM_PFNMAP_V0_V | NVIF_VMM_PFNMAP_V0_VRAM |
 603                 ((paddr >> PAGE_SHIFT) << NVIF_VMM_PFNMAP_V0_ADDR_SHIFT);
 604         if (src & MIGRATE_PFN_WRITE)
 605                 *pfn |= NVIF_VMM_PFNMAP_V0_W;
 606         return migrate_pfn(page_to_pfn(dpage));
 607
 608 out_dma_unmap:
 609         dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
 610 out_free_page:
 611         nouveau_dmem_page_free_locked(drm, dpage);
 612 out:
 613         *pfn = NVIF_VMM_PFNMAP_V0_NONE;
 614         return 0;
 615 }
 616
 617 static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
 618                 struct nouveau_svmm *svmm, struct migrate_vma *args,
 619                 dma_addr_t *dma_addrs, u64 *pfns)
 620 {
 621         struct nouveau_fence *fence;
 622         unsigned long addr = args->start, nr_dma = 0, i;
 623
 624         for (i = 0; addr < args->end; i++) {
 625                 args->dst[i] = nouveau_dmem_migrate_copy_one(drm, svmm,
 626                                 args->src[i], dma_addrs + nr_dma, pfns + i);
 627                 if (!dma_mapping_error(drm->dev->dev, dma_addrs[nr_dma]))
 628                         nr_dma++;
 629                 addr += PAGE_SIZE;
 630         }
 631
 632         nouveau_fence_new(drm->dmem->migrate.chan, false, &fence);
 633         migrate_vma_pages(args);
 634         nouveau_dmem_fence_done(&fence);
 635         nouveau_pfns_map(svmm, args->vma->vm_mm, args->start, pfns, i);
 636
 637         while (nr_dma--) {
 638                 dma_unmap_page(drm->dev->dev, dma_addrs[nr_dma], PAGE_SIZE,
 639                                 DMA_BIDIRECTIONAL);
 640         }
 641         migrate_vma_finalize(args);
 642 }
 643
 644 int
 645 nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
 646                          struct nouveau_svmm *svmm,
 647                          struct vm_area_struct *vma,
 648                          unsigned long start,
 649                          unsigned long end)
 650 {
 651         unsigned long npages = (end - start) >> PAGE_SHIFT;
 652         unsigned long max = min(SG_MAX_SINGLE_ALLOC, npages);
 653         dma_addr_t *dma_addrs;
 654         struct migrate_vma args = {
 655                 .vma            = vma,
 656                 .start          = start,
 657                 .pgmap_owner    = drm->dev,
 658                 .flags          = MIGRATE_VMA_SELECT_SYSTEM,
 659         };
 660         unsigned long i;
 661         u64 *pfns;
 662         int ret = -ENOMEM;
 663
 664         if (drm->dmem == NULL)
 665                 return -ENODEV;
 666
 667         args.src = kcalloc(max, sizeof(*args.src), GFP_KERNEL);
 668         if (!args.src)
 669                 goto out;
 670         args.dst = kcalloc(max, sizeof(*args.dst), GFP_KERNEL);
 671         if (!args.dst)
 672                 goto out_free_src;
 673
 674         dma_addrs = kmalloc_array(max, sizeof(*dma_addrs), GFP_KERNEL);
 675         if (!dma_addrs)
 676                 goto out_free_dst;
 677
 678         pfns = nouveau_pfns_alloc(max);
 679         if (!pfns)
 680                 goto out_free_dma;
 681
 682         for (i = 0; i < npages; i += max) {
 683                 args.end = start + (max << PAGE_SHIFT);
 684                 ret = migrate_vma_setup(&args);
 685                 if (ret)
 686                         goto out_free_pfns;
 687
 688                 if (args.cpages)
 689                         nouveau_dmem_migrate_chunk(drm, svmm, &args, dma_addrs,
 690                                                    pfns);
 691                 args.start = args.end;
 692         }
 693
 694         ret = 0;
 695 out_free_pfns:
 696         nouveau_pfns_free(pfns);
 697 out_free_dma:
 698         kfree(dma_addrs);
 699 out_free_dst:
 700         kfree(args.dst);
 701 out_free_src:
 702         kfree(args.src);
 703 out:
 704         return ret;
 705 }