drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c

   1 /*
   2  * Copyright 2010 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  * Authors: Ben Skeggs
  23  */
  24 #include "priv.h"
  25
  26 #include <core/gpuobj.h>
  27 #include <subdev/fb.h>
  28
  29 void
  30 nvkm_vm_map_at(struct nvkm_vma *vma, u64 delta, struct nvkm_mem *node)
  31 {
  32         struct nvkm_vm *vm = vma->vm;
  33         struct nvkm_mmu *mmu = vm->mmu;
  34         struct nvkm_mm_node *r = node->mem;
  35         int big = vma->node->type != mmu->func->spg_shift;
  36         u32 offset = vma->node->offset + (delta >> 12);
  37         u32 bits = vma->node->type - 12;
  38         u32 pde  = (offset >> mmu->func->pgt_bits) - vm->fpde;
  39         u32 pte  = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
  40         u32 max  = 1 << (mmu->func->pgt_bits - bits);
  41         u32 end, len;
  42
  43         delta = 0;
  44         while (r) {
  45                 u64 phys = (u64)r->offset << 12;
  46                 u32 num  = r->length >> bits;
  47
  48                 while (num) {
  49                         struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
  50
  51                         end = (pte + num);
  52                         if (unlikely(end >= max))
  53                                 end = max;
  54                         len = end - pte;
  55
  56                         mmu->func->map(vma, pgt, node, pte, len, phys, delta);
  57
  58                         num -= len;
  59                         pte += len;
  60                         if (unlikely(end >= max)) {
  61                                 phys += len << (bits + 12);
  62                                 pde++;
  63                                 pte = 0;
  64                         }
  65
  66                         delta += (u64)len << vma->node->type;
  67                 }
  68                 r = r->next;
  69         };
  70
  71         mmu->func->flush(vm);
  72 }
  73
  74 static void
  75 nvkm_vm_map_sg_table(struct nvkm_vma *vma, u64 delta, u64 length,
  76                      struct nvkm_mem *mem)
  77 {
  78         struct nvkm_vm *vm = vma->vm;
  79         struct nvkm_mmu *mmu = vm->mmu;
  80         int big = vma->node->type != mmu->func->spg_shift;
  81         u32 offset = vma->node->offset + (delta >> 12);
  82         u32 bits = vma->node->type - 12;
  83         u32 num  = length >> vma->node->type;
  84         u32 pde  = (offset >> mmu->func->pgt_bits) - vm->fpde;
  85         u32 pte  = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
  86         u32 max  = 1 << (mmu->func->pgt_bits - bits);
  87         unsigned m, sglen;
  88         u32 end, len;
  89         int i;
  90         struct scatterlist *sg;
  91
  92         for_each_sg(mem->sg->sgl, sg, mem->sg->nents, i) {
  93                 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
  94                 sglen = sg_dma_len(sg) >> PAGE_SHIFT;
  95
  96                 end = pte + sglen;
  97                 if (unlikely(end >= max))
  98                         end = max;
  99                 len = end - pte;
 100
 101                 for (m = 0; m < len; m++) {
 102                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 103
 104                         mmu->func->map_sg(vma, pgt, mem, pte, 1, &addr);
 105                         num--;
 106                         pte++;
 107
 108                         if (num == 0)
 109                                 goto finish;
 110                 }
 111                 if (unlikely(end >= max)) {
 112                         pde++;
 113                         pte = 0;
 114                 }
 115                 if (m < sglen) {
 116                         for (; m < sglen; m++) {
 117                                 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 118
 119                                 mmu->func->map_sg(vma, pgt, mem, pte, 1, &addr);
 120                                 num--;
 121                                 pte++;
 122                                 if (num == 0)
 123                                         goto finish;
 124                         }
 125                 }
 126
 127         }
 128 finish:
 129         mmu->func->flush(vm);
 130 }
 131
 132 static void
 133 nvkm_vm_map_sg(struct nvkm_vma *vma, u64 delta, u64 length,
 134                struct nvkm_mem *mem)
 135 {
 136         struct nvkm_vm *vm = vma->vm;
 137         struct nvkm_mmu *mmu = vm->mmu;
 138         dma_addr_t *list = mem->pages;
 139         int big = vma->node->type != mmu->func->spg_shift;
 140         u32 offset = vma->node->offset + (delta >> 12);
 141         u32 bits = vma->node->type - 12;
 142         u32 num  = length >> vma->node->type;
 143         u32 pde  = (offset >> mmu->func->pgt_bits) - vm->fpde;
 144         u32 pte  = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
 145         u32 max  = 1 << (mmu->func->pgt_bits - bits);
 146         u32 end, len;
 147
 148         while (num) {
 149                 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
 150
 151                 end = (pte + num);
 152                 if (unlikely(end >= max))
 153                         end = max;
 154                 len = end - pte;
 155
 156                 mmu->func->map_sg(vma, pgt, mem, pte, len, list);
 157
 158                 num  -= len;
 159                 pte  += len;
 160                 list += len;
 161                 if (unlikely(end >= max)) {
 162                         pde++;
 163                         pte = 0;
 164                 }
 165         }
 166
 167         mmu->func->flush(vm);
 168 }
 169
 170 void
 171 nvkm_vm_map(struct nvkm_vma *vma, struct nvkm_mem *node)
 172 {
 173         if (node->sg)
 174                 nvkm_vm_map_sg_table(vma, 0, node->size << 12, node);
 175         else
 176         if (node->pages)
 177                 nvkm_vm_map_sg(vma, 0, node->size << 12, node);
 178         else
 179                 nvkm_vm_map_at(vma, 0, node);
 180 }
 181
 182 void
 183 nvkm_vm_unmap_at(struct nvkm_vma *vma, u64 delta, u64 length)
 184 {
 185         struct nvkm_vm *vm = vma->vm;
 186         struct nvkm_mmu *mmu = vm->mmu;
 187         int big = vma->node->type != mmu->func->spg_shift;
 188         u32 offset = vma->node->offset + (delta >> 12);
 189         u32 bits = vma->node->type - 12;
 190         u32 num  = length >> vma->node->type;
 191         u32 pde  = (offset >> mmu->func->pgt_bits) - vm->fpde;
 192         u32 pte  = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
 193         u32 max  = 1 << (mmu->func->pgt_bits - bits);
 194         u32 end, len;
 195
 196         while (num) {
 197                 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
 198
 199                 end = (pte + num);
 200                 if (unlikely(end >= max))
 201                         end = max;
 202                 len = end - pte;
 203
 204                 mmu->func->unmap(vma, pgt, pte, len);
 205
 206                 num -= len;
 207                 pte += len;
 208                 if (unlikely(end >= max)) {
 209                         pde++;
 210                         pte = 0;
 211                 }
 212         }
 213
 214         mmu->func->flush(vm);
 215 }
 216
 217 void
 218 nvkm_vm_unmap(struct nvkm_vma *vma)
 219 {
 220         nvkm_vm_unmap_at(vma, 0, (u64)vma->node->length << 12);
 221 }
 222
 223 static void
 224 nvkm_vm_unmap_pgt(struct nvkm_vm *vm, int big, u32 fpde, u32 lpde)
 225 {
 226         struct nvkm_mmu *mmu = vm->mmu;
 227         struct nvkm_vm_pgd *vpgd;
 228         struct nvkm_vm_pgt *vpgt;
 229         struct nvkm_memory *pgt;
 230         u32 pde;
 231
 232         for (pde = fpde; pde <= lpde; pde++) {
 233                 vpgt = &vm->pgt[pde - vm->fpde];
 234                 if (--vpgt->refcount[big])
 235                         continue;
 236
 237                 pgt = vpgt->mem[big];
 238                 vpgt->mem[big] = NULL;
 239
 240                 list_for_each_entry(vpgd, &vm->pgd_list, head) {
 241                         mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem);
 242                 }
 243
 244                 nvkm_memory_del(&pgt);
 245         }
 246 }
 247
 248 static int
 249 nvkm_vm_map_pgt(struct nvkm_vm *vm, u32 pde, u32 type)
 250 {
 251         struct nvkm_mmu *mmu = vm->mmu;
 252         struct nvkm_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 253         struct nvkm_vm_pgd *vpgd;
 254         int big = (type != mmu->func->spg_shift);
 255         u32 pgt_size;
 256         int ret;
 257
 258         pgt_size  = (1 << (mmu->func->pgt_bits + 12)) >> type;
 259         pgt_size *= 8;
 260
 261         ret = nvkm_memory_new(mmu->subdev.device, NVKM_MEM_TARGET_INST,
 262                               pgt_size, 0x1000, true, &vpgt->mem[big]);
 263         if (unlikely(ret))
 264                 return ret;
 265
 266         list_for_each_entry(vpgd, &vm->pgd_list, head) {
 267                 mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem);
 268         }
 269
 270         vpgt->refcount[big]++;
 271         return 0;
 272 }
 273
 274 int
 275 nvkm_vm_get(struct nvkm_vm *vm, u64 size, u32 page_shift, u32 access,
 276             struct nvkm_vma *vma)
 277 {
 278         struct nvkm_mmu *mmu = vm->mmu;
 279         u32 align = (1 << page_shift) >> 12;
 280         u32 msize = size >> 12;
 281         u32 fpde, lpde, pde;
 282         int ret;
 283
 284         mutex_lock(&vm->mutex);
 285         ret = nvkm_mm_head(&vm->mm, 0, page_shift, msize, msize, align,
 286                            &vma->node);
 287         if (unlikely(ret != 0)) {
 288                 mutex_unlock(&vm->mutex);
 289                 return ret;
 290         }
 291
 292         fpde = (vma->node->offset >> mmu->func->pgt_bits);
 293         lpde = (vma->node->offset + vma->node->length - 1) >> mmu->func->pgt_bits;
 294
 295         for (pde = fpde; pde <= lpde; pde++) {
 296                 struct nvkm_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 297                 int big = (vma->node->type != mmu->func->spg_shift);
 298
 299                 if (likely(vpgt->refcount[big])) {
 300                         vpgt->refcount[big]++;
 301                         continue;
 302                 }
 303
 304                 ret = nvkm_vm_map_pgt(vm, pde, vma->node->type);
 305                 if (ret) {
 306                         if (pde != fpde)
 307                                 nvkm_vm_unmap_pgt(vm, big, fpde, pde - 1);
 308                         nvkm_mm_free(&vm->mm, &vma->node);
 309                         mutex_unlock(&vm->mutex);
 310                         return ret;
 311                 }
 312         }
 313         mutex_unlock(&vm->mutex);
 314
 315         vma->vm = NULL;
 316         nvkm_vm_ref(vm, &vma->vm, NULL);
 317         vma->offset = (u64)vma->node->offset << 12;
 318         vma->access = access;
 319         return 0;
 320 }
 321
 322 void
 323 nvkm_vm_put(struct nvkm_vma *vma)
 324 {
 325         struct nvkm_mmu *mmu;
 326         struct nvkm_vm *vm;
 327         u32 fpde, lpde;
 328
 329         if (unlikely(vma->node == NULL))
 330                 return;
 331         vm = vma->vm;
 332         mmu = vm->mmu;
 333
 334         fpde = (vma->node->offset >> mmu->func->pgt_bits);
 335         lpde = (vma->node->offset + vma->node->length - 1) >> mmu->func->pgt_bits;
 336
 337         mutex_lock(&vm->mutex);
 338         nvkm_vm_unmap_pgt(vm, vma->node->type != mmu->func->spg_shift, fpde, lpde);
 339         nvkm_mm_free(&vm->mm, &vma->node);
 340         mutex_unlock(&vm->mutex);
 341
 342         nvkm_vm_ref(NULL, &vma->vm, NULL);
 343 }
 344
 345 int
 346 nvkm_vm_boot(struct nvkm_vm *vm, u64 size)
 347 {
 348         struct nvkm_mmu *mmu = vm->mmu;
 349         struct nvkm_memory *pgt;
 350         int ret;
 351
 352         ret = nvkm_memory_new(mmu->subdev.device, NVKM_MEM_TARGET_INST,
 353                               (size >> mmu->func->spg_shift) * 8, 0x1000, true, &pgt);
 354         if (ret == 0) {
 355                 vm->pgt[0].refcount[0] = 1;
 356                 vm->pgt[0].mem[0] = pgt;
 357                 nvkm_memory_boot(pgt, vm);
 358         }
 359
 360         return ret;
 361 }
 362
 363 int
 364 nvkm_vm_create(struct nvkm_mmu *mmu, u64 offset, u64 length, u64 mm_offset,
 365                u32 block, struct lock_class_key *key, struct nvkm_vm **pvm)
 366 {
 367         static struct lock_class_key _key;
 368         struct nvkm_vm *vm;
 369         u64 mm_length = (offset + length) - mm_offset;
 370         int ret;
 371
 372         vm = kzalloc(sizeof(*vm), GFP_KERNEL);
 373         if (!vm)
 374                 return -ENOMEM;
 375
 376         __mutex_init(&vm->mutex, "&vm->mutex", key ? key : &_key);
 377         INIT_LIST_HEAD(&vm->pgd_list);
 378         vm->mmu = mmu;
 379         kref_init(&vm->refcount);
 380         vm->fpde = offset >> (mmu->func->pgt_bits + 12);
 381         vm->lpde = (offset + length - 1) >> (mmu->func->pgt_bits + 12);
 382
 383         vm->pgt  = vzalloc((vm->lpde - vm->fpde + 1) * sizeof(*vm->pgt));
 384         if (!vm->pgt) {
 385                 kfree(vm);
 386                 return -ENOMEM;
 387         }
 388
 389         ret = nvkm_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
 390                            block >> 12);
 391         if (ret) {
 392                 vfree(vm->pgt);
 393                 kfree(vm);
 394                 return ret;
 395         }
 396
 397         *pvm = vm;
 398
 399         return 0;
 400 }
 401
 402 int
 403 nvkm_vm_new(struct nvkm_device *device, u64 offset, u64 length, u64 mm_offset,
 404             struct lock_class_key *key, struct nvkm_vm **pvm)
 405 {
 406         struct nvkm_mmu *mmu = device->mmu;
 407         if (!mmu->func->create)
 408                 return -EINVAL;
 409         return mmu->func->create(mmu, offset, length, mm_offset, key, pvm);
 410 }
 411
 412 static int
 413 nvkm_vm_link(struct nvkm_vm *vm, struct nvkm_gpuobj *pgd)
 414 {
 415         struct nvkm_mmu *mmu = vm->mmu;
 416         struct nvkm_vm_pgd *vpgd;
 417         int i;
 418
 419         if (!pgd)
 420                 return 0;
 421
 422         vpgd = kzalloc(sizeof(*vpgd), GFP_KERNEL);
 423         if (!vpgd)
 424                 return -ENOMEM;
 425
 426         vpgd->obj = pgd;
 427
 428         mutex_lock(&vm->mutex);
 429         for (i = vm->fpde; i <= vm->lpde; i++)
 430                 mmu->func->map_pgt(pgd, i, vm->pgt[i - vm->fpde].mem);
 431         list_add(&vpgd->head, &vm->pgd_list);
 432         mutex_unlock(&vm->mutex);
 433         return 0;
 434 }
 435
 436 static void
 437 nvkm_vm_unlink(struct nvkm_vm *vm, struct nvkm_gpuobj *mpgd)
 438 {
 439         struct nvkm_vm_pgd *vpgd, *tmp;
 440
 441         if (!mpgd)
 442                 return;
 443
 444         mutex_lock(&vm->mutex);
 445         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 446                 if (vpgd->obj == mpgd) {
 447                         list_del(&vpgd->head);
 448                         kfree(vpgd);
 449                         break;
 450                 }
 451         }
 452         mutex_unlock(&vm->mutex);
 453 }
 454
 455 static void
 456 nvkm_vm_del(struct kref *kref)
 457 {
 458         struct nvkm_vm *vm = container_of(kref, typeof(*vm), refcount);
 459         struct nvkm_vm_pgd *vpgd, *tmp;
 460
 461         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 462                 nvkm_vm_unlink(vm, vpgd->obj);
 463         }
 464
 465         nvkm_mm_fini(&vm->mm);
 466         vfree(vm->pgt);
 467         kfree(vm);
 468 }
 469
 470 int
 471 nvkm_vm_ref(struct nvkm_vm *ref, struct nvkm_vm **ptr, struct nvkm_gpuobj *pgd)
 472 {
 473         if (ref) {
 474                 int ret = nvkm_vm_link(ref, pgd);
 475                 if (ret)
 476                         return ret;
 477
 478                 kref_get(&ref->refcount);
 479         }
 480
 481         if (*ptr) {
 482                 nvkm_vm_unlink(*ptr, pgd);
 483                 kref_put(&(*ptr)->refcount, nvkm_vm_del);
 484         }
 485
 486         *ptr = ref;
 487         return 0;
 488 }
 489
 490 static int
 491 nvkm_mmu_oneinit(struct nvkm_subdev *subdev)
 492 {
 493         struct nvkm_mmu *mmu = nvkm_mmu(subdev);
 494         if (mmu->func->oneinit)
 495                 return mmu->func->oneinit(mmu);
 496         return 0;
 497 }
 498
 499 static int
 500 nvkm_mmu_init(struct nvkm_subdev *subdev)
 501 {
 502         struct nvkm_mmu *mmu = nvkm_mmu(subdev);
 503         if (mmu->func->init)
 504                 mmu->func->init(mmu);
 505         return 0;
 506 }
 507
 508 static void *
 509 nvkm_mmu_dtor(struct nvkm_subdev *subdev)
 510 {
 511         struct nvkm_mmu *mmu = nvkm_mmu(subdev);
 512         if (mmu->func->dtor)
 513                 return mmu->func->dtor(mmu);
 514         return mmu;
 515 }
 516
 517 static const struct nvkm_subdev_func
 518 nvkm_mmu = {
 519         .dtor = nvkm_mmu_dtor,
 520         .oneinit = nvkm_mmu_oneinit,
 521         .init = nvkm_mmu_init,
 522 };
 523
 524 void
 525 nvkm_mmu_ctor(const struct nvkm_mmu_func *func, struct nvkm_device *device,
 526               int index, struct nvkm_mmu *mmu)
 527 {
 528         nvkm_subdev_ctor(&nvkm_mmu, device, index, &mmu->subdev);
 529         mmu->func = func;
 530         mmu->limit = func->limit;
 531         mmu->dma_bits = func->dma_bits;
 532         mmu->lpg_shift = func->lpg_shift;
 533 }
 534
 535 int
 536 nvkm_mmu_new_(const struct nvkm_mmu_func *func, struct nvkm_device *device,
 537               int index, struct nvkm_mmu **pmmu)
 538 {
 539         if (!(*pmmu = kzalloc(sizeof(**pmmu), GFP_KERNEL)))
 540                 return -ENOMEM;
 541         nvkm_mmu_ctor(func, device, index, *pmmu);
 542         return 0;
 543 }