drivers/gpu/drm/nouveau/core/subdev/vm/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
  25 #include <core/gpuobj.h>
  26 #include <core/mm.h>
  27
  28 #include <subdev/fb.h>
  29 #include <subdev/vm.h>
  30
  31 void
  32 nouveau_vm_map_at(struct nouveau_vma *vma, u64 delta, struct nouveau_mem *node)
  33 {
  34         struct nouveau_vm *vm = vma->vm;
  35         struct nouveau_vmmgr *vmm = vm->vmm;
  36         struct nouveau_mm_node *r;
  37         int big = vma->node->type != vmm->spg_shift;
  38         u32 offset = vma->node->offset + (delta >> 12);
  39         u32 bits = vma->node->type - 12;
  40         u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
  41         u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
  42         u32 max  = 1 << (vmm->pgt_bits - bits);
  43         u32 end, len;
  44
  45         delta = 0;
  46         list_for_each_entry(r, &node->regions, rl_entry) {
  47                 u64 phys = (u64)r->offset << 12;
  48                 u32 num  = r->length >> bits;
  49
  50                 while (num) {
  51                         struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
  52
  53                         end = (pte + num);
  54                         if (unlikely(end >= max))
  55                                 end = max;
  56                         len = end - pte;
  57
  58                         vmm->map(vma, pgt, node, pte, len, phys, delta);
  59
  60                         num -= len;
  61                         pte += len;
  62                         if (unlikely(end >= max)) {
  63                                 phys += len << (bits + 12);
  64                                 pde++;
  65                                 pte = 0;
  66                         }
  67
  68                         delta += (u64)len << vma->node->type;
  69                 }
  70         }
  71
  72         vmm->flush(vm);
  73 }
  74
  75 void
  76 nouveau_vm_map(struct nouveau_vma *vma, struct nouveau_mem *node)
  77 {
  78         nouveau_vm_map_at(vma, 0, node);
  79 }
  80
  81 void
  82 nouveau_vm_map_sg_table(struct nouveau_vma *vma, u64 delta, u64 length,
  83                         struct nouveau_mem *mem)
  84 {
  85         struct nouveau_vm *vm = vma->vm;
  86         struct nouveau_vmmgr *vmm = vm->vmm;
  87         int big = vma->node->type != vmm->spg_shift;
  88         u32 offset = vma->node->offset + (delta >> 12);
  89         u32 bits = vma->node->type - 12;
  90         u32 num  = length >> vma->node->type;
  91         u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
  92         u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
  93         u32 max  = 1 << (vmm->pgt_bits - bits);
  94         unsigned m, sglen;
  95         u32 end, len;
  96         int i;
  97         struct scatterlist *sg;
  98
  99         for_each_sg(mem->sg->sgl, sg, mem->sg->nents, i) {
 100                 struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
 101                 sglen = sg_dma_len(sg) >> PAGE_SHIFT;
 102
 103                 end = pte + sglen;
 104                 if (unlikely(end >= max))
 105                         end = max;
 106                 len = end - pte;
 107
 108                 for (m = 0; m < len; m++) {
 109                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 110
 111                         vmm->map_sg(vma, pgt, mem, pte, 1, &addr);
 112                         num--;
 113                         pte++;
 114
 115                         if (num == 0)
 116                                 goto finish;
 117                 }
 118                 if (unlikely(end >= max)) {
 119                         pde++;
 120                         pte = 0;
 121                 }
 122                 if (m < sglen) {
 123                         for (; m < sglen; m++) {
 124                                 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 125
 126                                 vmm->map_sg(vma, pgt, mem, pte, 1, &addr);
 127                                 num--;
 128                                 pte++;
 129                                 if (num == 0)
 130                                         goto finish;
 131                         }
 132                 }
 133
 134         }
 135 finish:
 136         vmm->flush(vm);
 137 }
 138
 139 void
 140 nouveau_vm_map_sg(struct nouveau_vma *vma, u64 delta, u64 length,
 141                   struct nouveau_mem *mem)
 142 {
 143         struct nouveau_vm *vm = vma->vm;
 144         struct nouveau_vmmgr *vmm = vm->vmm;
 145         dma_addr_t *list = mem->pages;
 146         int big = vma->node->type != vmm->spg_shift;
 147         u32 offset = vma->node->offset + (delta >> 12);
 148         u32 bits = vma->node->type - 12;
 149         u32 num  = length >> vma->node->type;
 150         u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
 151         u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
 152         u32 max  = 1 << (vmm->pgt_bits - bits);
 153         u32 end, len;
 154
 155         while (num) {
 156                 struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
 157
 158                 end = (pte + num);
 159                 if (unlikely(end >= max))
 160                         end = max;
 161                 len = end - pte;
 162
 163                 vmm->map_sg(vma, pgt, mem, pte, len, list);
 164
 165                 num  -= len;
 166                 pte  += len;
 167                 list += len;
 168                 if (unlikely(end >= max)) {
 169                         pde++;
 170                         pte = 0;
 171                 }
 172         }
 173
 174         vmm->flush(vm);
 175 }
 176
 177 void
 178 nouveau_vm_unmap_at(struct nouveau_vma *vma, u64 delta, u64 length)
 179 {
 180         struct nouveau_vm *vm = vma->vm;
 181         struct nouveau_vmmgr *vmm = vm->vmm;
 182         int big = vma->node->type != vmm->spg_shift;
 183         u32 offset = vma->node->offset + (delta >> 12);
 184         u32 bits = vma->node->type - 12;
 185         u32 num  = length >> vma->node->type;
 186         u32 pde  = (offset >> vmm->pgt_bits) - vm->fpde;
 187         u32 pte  = (offset & ((1 << vmm->pgt_bits) - 1)) >> bits;
 188         u32 max  = 1 << (vmm->pgt_bits - bits);
 189         u32 end, len;
 190
 191         while (num) {
 192                 struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
 193
 194                 end = (pte + num);
 195                 if (unlikely(end >= max))
 196                         end = max;
 197                 len = end - pte;
 198
 199                 vmm->unmap(pgt, pte, len);
 200
 201                 num -= len;
 202                 pte += len;
 203                 if (unlikely(end >= max)) {
 204                         pde++;
 205                         pte = 0;
 206                 }
 207         }
 208
 209         vmm->flush(vm);
 210 }
 211
 212 void
 213 nouveau_vm_unmap(struct nouveau_vma *vma)
 214 {
 215         nouveau_vm_unmap_at(vma, 0, (u64)vma->node->length << 12);
 216 }
 217
 218 static void
 219 nouveau_vm_unmap_pgt(struct nouveau_vm *vm, int big, u32 fpde, u32 lpde)
 220 {
 221         struct nouveau_vmmgr *vmm = vm->vmm;
 222         struct nouveau_vm_pgd *vpgd;
 223         struct nouveau_vm_pgt *vpgt;
 224         struct nouveau_gpuobj *pgt;
 225         u32 pde;
 226
 227         for (pde = fpde; pde <= lpde; pde++) {
 228                 vpgt = &vm->pgt[pde - vm->fpde];
 229                 if (--vpgt->refcount[big])
 230                         continue;
 231
 232                 pgt = vpgt->obj[big];
 233                 vpgt->obj[big] = NULL;
 234
 235                 list_for_each_entry(vpgd, &vm->pgd_list, head) {
 236                         vmm->map_pgt(vpgd->obj, pde, vpgt->obj);
 237                 }
 238
 239                 mutex_unlock(&vm->mm.mutex);
 240                 nouveau_gpuobj_ref(NULL, &pgt);
 241                 mutex_lock(&vm->mm.mutex);
 242         }
 243 }
 244
 245 static int
 246 nouveau_vm_map_pgt(struct nouveau_vm *vm, u32 pde, u32 type)
 247 {
 248         struct nouveau_vmmgr *vmm = vm->vmm;
 249         struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 250         struct nouveau_vm_pgd *vpgd;
 251         struct nouveau_gpuobj *pgt;
 252         int big = (type != vmm->spg_shift);
 253         u32 pgt_size;
 254         int ret;
 255
 256         pgt_size  = (1 << (vmm->pgt_bits + 12)) >> type;
 257         pgt_size *= 8;
 258
 259         mutex_unlock(&vm->mm.mutex);
 260         ret = nouveau_gpuobj_new(nv_object(vm->vmm), NULL, pgt_size, 0x1000,
 261                                  NVOBJ_FLAG_ZERO_ALLOC, &pgt);
 262         mutex_lock(&vm->mm.mutex);
 263         if (unlikely(ret))
 264                 return ret;
 265
 266         /* someone beat us to filling the PDE while we didn't have the lock */
 267         if (unlikely(vpgt->refcount[big]++)) {
 268                 mutex_unlock(&vm->mm.mutex);
 269                 nouveau_gpuobj_ref(NULL, &pgt);
 270                 mutex_lock(&vm->mm.mutex);
 271                 return 0;
 272         }
 273
 274         vpgt->obj[big] = pgt;
 275         list_for_each_entry(vpgd, &vm->pgd_list, head) {
 276                 vmm->map_pgt(vpgd->obj, pde, vpgt->obj);
 277         }
 278
 279         return 0;
 280 }
 281
 282 int
 283 nouveau_vm_get(struct nouveau_vm *vm, u64 size, u32 page_shift,
 284                u32 access, struct nouveau_vma *vma)
 285 {
 286         struct nouveau_vmmgr *vmm = vm->vmm;
 287         u32 align = (1 << page_shift) >> 12;
 288         u32 msize = size >> 12;
 289         u32 fpde, lpde, pde;
 290         int ret;
 291
 292         mutex_lock(&vm->mm.mutex);
 293         ret = nouveau_mm_head(&vm->mm, page_shift, msize, msize, align,
 294                              &vma->node);
 295         if (unlikely(ret != 0)) {
 296                 mutex_unlock(&vm->mm.mutex);
 297                 return ret;
 298         }
 299
 300         fpde = (vma->node->offset >> vmm->pgt_bits);
 301         lpde = (vma->node->offset + vma->node->length - 1) >> vmm->pgt_bits;
 302
 303         for (pde = fpde; pde <= lpde; pde++) {
 304                 struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 305                 int big = (vma->node->type != vmm->spg_shift);
 306
 307                 if (likely(vpgt->refcount[big])) {
 308                         vpgt->refcount[big]++;
 309                         continue;
 310                 }
 311
 312                 ret = nouveau_vm_map_pgt(vm, pde, vma->node->type);
 313                 if (ret) {
 314                         if (pde != fpde)
 315                                 nouveau_vm_unmap_pgt(vm, big, fpde, pde - 1);
 316                         nouveau_mm_free(&vm->mm, &vma->node);
 317                         mutex_unlock(&vm->mm.mutex);
 318                         return ret;
 319                 }
 320         }
 321         mutex_unlock(&vm->mm.mutex);
 322
 323         vma->vm     = vm;
 324         vma->offset = (u64)vma->node->offset << 12;
 325         vma->access = access;
 326         return 0;
 327 }
 328
 329 void
 330 nouveau_vm_put(struct nouveau_vma *vma)
 331 {
 332         struct nouveau_vm *vm = vma->vm;
 333         struct nouveau_vmmgr *vmm = vm->vmm;
 334         u32 fpde, lpde;
 335
 336         if (unlikely(vma->node == NULL))
 337                 return;
 338         fpde = (vma->node->offset >> vmm->pgt_bits);
 339         lpde = (vma->node->offset + vma->node->length - 1) >> vmm->pgt_bits;
 340
 341         mutex_lock(&vm->mm.mutex);
 342         nouveau_vm_unmap_pgt(vm, vma->node->type != vmm->spg_shift, fpde, lpde);
 343         nouveau_mm_free(&vm->mm, &vma->node);
 344         mutex_unlock(&vm->mm.mutex);
 345 }
 346
 347 int
 348 nouveau_vm_create(struct nouveau_vmmgr *vmm, u64 offset, u64 length,
 349                   u64 mm_offset, u32 block, struct nouveau_vm **pvm)
 350 {
 351         struct nouveau_vm *vm;
 352         u64 mm_length = (offset + length) - mm_offset;
 353         int ret;
 354
 355         vm = *pvm = kzalloc(sizeof(*vm), GFP_KERNEL);
 356         if (!vm)
 357                 return -ENOMEM;
 358
 359         INIT_LIST_HEAD(&vm->pgd_list);
 360         vm->vmm = vmm;
 361         vm->refcount = 1;
 362         vm->fpde = offset >> (vmm->pgt_bits + 12);
 363         vm->lpde = (offset + length - 1) >> (vmm->pgt_bits + 12);
 364
 365         vm->pgt  = kcalloc(vm->lpde - vm->fpde + 1, sizeof(*vm->pgt), GFP_KERNEL);
 366         if (!vm->pgt) {
 367                 kfree(vm);
 368                 return -ENOMEM;
 369         }
 370
 371         ret = nouveau_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
 372                               block >> 12);
 373         if (ret) {
 374                 kfree(vm->pgt);
 375                 kfree(vm);
 376                 return ret;
 377         }
 378
 379         return 0;
 380 }
 381
 382 int
 383 nouveau_vm_new(struct nouveau_device *device, u64 offset, u64 length,
 384                u64 mm_offset, struct nouveau_vm **pvm)
 385 {
 386         struct nouveau_vmmgr *vmm = nouveau_vmmgr(device);
 387         return vmm->create(vmm, offset, length, mm_offset, pvm);
 388 }
 389
 390 static int
 391 nouveau_vm_link(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)
 392 {
 393         struct nouveau_vmmgr *vmm = vm->vmm;
 394         struct nouveau_vm_pgd *vpgd;
 395         int i;
 396
 397         if (!pgd)
 398                 return 0;
 399
 400         vpgd = kzalloc(sizeof(*vpgd), GFP_KERNEL);
 401         if (!vpgd)
 402                 return -ENOMEM;
 403
 404         nouveau_gpuobj_ref(pgd, &vpgd->obj);
 405
 406         mutex_lock(&vm->mm.mutex);
 407         for (i = vm->fpde; i <= vm->lpde; i++)
 408                 vmm->map_pgt(pgd, i, vm->pgt[i - vm->fpde].obj);
 409         list_add(&vpgd->head, &vm->pgd_list);
 410         mutex_unlock(&vm->mm.mutex);
 411         return 0;
 412 }
 413
 414 static void
 415 nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd)
 416 {
 417         struct nouveau_vm_pgd *vpgd, *tmp;
 418         struct nouveau_gpuobj *pgd = NULL;
 419
 420         if (!mpgd)
 421                 return;
 422
 423         mutex_lock(&vm->mm.mutex);
 424         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 425                 if (vpgd->obj == mpgd) {
 426                         pgd = vpgd->obj;
 427                         list_del(&vpgd->head);
 428                         kfree(vpgd);
 429                         break;
 430                 }
 431         }
 432         mutex_unlock(&vm->mm.mutex);
 433
 434         nouveau_gpuobj_ref(NULL, &pgd);
 435 }
 436
 437 static void
 438 nouveau_vm_del(struct nouveau_vm *vm)
 439 {
 440         struct nouveau_vm_pgd *vpgd, *tmp;
 441
 442         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 443                 nouveau_vm_unlink(vm, vpgd->obj);
 444         }
 445
 446         nouveau_mm_fini(&vm->mm);
 447         kfree(vm->pgt);
 448         kfree(vm);
 449 }
 450
 451 int
 452 nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr,
 453                struct nouveau_gpuobj *pgd)
 454 {
 455         struct nouveau_vm *vm;
 456         int ret;
 457
 458         vm = ref;
 459         if (vm) {
 460                 ret = nouveau_vm_link(vm, pgd);
 461                 if (ret)
 462                         return ret;
 463
 464                 vm->refcount++;
 465         }
 466
 467         vm = *ptr;
 468         *ptr = ref;
 469
 470         if (vm) {
 471                 nouveau_vm_unlink(vm, pgd);
 472
 473                 if (--vm->refcount == 0)
 474                         nouveau_vm_del(vm);
 475         }
 476
 477         return 0;
 478 }