drivers/gpu/drm/nouveau/nouveau_vm.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 "drmP.h"
  26 #include "nouveau_drv.h"
  27 #include "nouveau_mm.h"
  28 #include "nouveau_vm.h"
  29
  30 void
  31 nouveau_vm_map_at(struct nouveau_vma *vma, u64 delta, struct nouveau_mem *node)
  32 {
  33         struct nouveau_vm *vm = vma->vm;
  34         struct nouveau_mm_node *r;
  35         int big = vma->node->type != vm->spg_shift;
  36         u32 offset = vma->node->offset + (delta >> 12);
  37         u32 bits = vma->node->type - 12;
  38         u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
  39         u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
  40         u32 max  = 1 << (vm->pgt_bits - bits);
  41         u32 end, len;
  42
  43         delta = 0;
  44         list_for_each_entry(r, &node->regions, rl_entry) {
  45                 u64 phys = (u64)r->offset << 12;
  46                 u32 num  = r->length >> bits;
  47
  48                 while (num) {
  49                         struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
  50
  51                         end = (pte + num);
  52                         if (unlikely(end >= max))
  53                                 end = max;
  54                         len = end - pte;
  55
  56                         vm->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         }
  69
  70         vm->flush(vm);
  71 }
  72
  73 void
  74 nouveau_vm_map(struct nouveau_vma *vma, struct nouveau_mem *node)
  75 {
  76         nouveau_vm_map_at(vma, 0, node);
  77 }
  78
  79 void
  80 nouveau_vm_map_sg(struct nouveau_vma *vma, u64 delta, u64 length,
  81                   struct nouveau_mem *mem)
  82 {
  83         struct nouveau_vm *vm = vma->vm;
  84         dma_addr_t *list = mem->pages;
  85         int big = vma->node->type != vm->spg_shift;
  86         u32 offset = vma->node->offset + (delta >> 12);
  87         u32 bits = vma->node->type - 12;
  88         u32 num  = length >> vma->node->type;
  89         u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
  90         u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
  91         u32 max  = 1 << (vm->pgt_bits - bits);
  92         u32 end, len;
  93
  94         while (num) {
  95                 struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
  96
  97                 end = (pte + num);
  98                 if (unlikely(end >= max))
  99                         end = max;
 100                 len = end - pte;
 101
 102                 vm->map_sg(vma, pgt, mem, pte, len, list);
 103
 104                 num  -= len;
 105                 pte  += len;
 106                 list += len;
 107                 if (unlikely(end >= max)) {
 108                         pde++;
 109                         pte = 0;
 110                 }
 111         }
 112
 113         vm->flush(vm);
 114 }
 115
 116 void
 117 nouveau_vm_unmap_at(struct nouveau_vma *vma, u64 delta, u64 length)
 118 {
 119         struct nouveau_vm *vm = vma->vm;
 120         int big = vma->node->type != vm->spg_shift;
 121         u32 offset = vma->node->offset + (delta >> 12);
 122         u32 bits = vma->node->type - 12;
 123         u32 num  = length >> vma->node->type;
 124         u32 pde  = (offset >> vm->pgt_bits) - vm->fpde;
 125         u32 pte  = (offset & ((1 << vm->pgt_bits) - 1)) >> bits;
 126         u32 max  = 1 << (vm->pgt_bits - bits);
 127         u32 end, len;
 128
 129         while (num) {
 130                 struct nouveau_gpuobj *pgt = vm->pgt[pde].obj[big];
 131
 132                 end = (pte + num);
 133                 if (unlikely(end >= max))
 134                         end = max;
 135                 len = end - pte;
 136
 137                 vm->unmap(pgt, pte, len);
 138
 139                 num -= len;
 140                 pte += len;
 141                 if (unlikely(end >= max)) {
 142                         pde++;
 143                         pte = 0;
 144                 }
 145         }
 146
 147         vm->flush(vm);
 148 }
 149
 150 void
 151 nouveau_vm_unmap(struct nouveau_vma *vma)
 152 {
 153         nouveau_vm_unmap_at(vma, 0, (u64)vma->node->length << 12);
 154 }
 155
 156 static void
 157 nouveau_vm_unmap_pgt(struct nouveau_vm *vm, int big, u32 fpde, u32 lpde)
 158 {
 159         struct nouveau_vm_pgd *vpgd;
 160         struct nouveau_vm_pgt *vpgt;
 161         struct nouveau_gpuobj *pgt;
 162         u32 pde;
 163
 164         for (pde = fpde; pde <= lpde; pde++) {
 165                 vpgt = &vm->pgt[pde - vm->fpde];
 166                 if (--vpgt->refcount[big])
 167                         continue;
 168
 169                 pgt = vpgt->obj[big];
 170                 vpgt->obj[big] = NULL;
 171
 172                 list_for_each_entry(vpgd, &vm->pgd_list, head) {
 173                         vm->map_pgt(vpgd->obj, pde, vpgt->obj);
 174                 }
 175
 176                 mutex_unlock(&vm->mm.mutex);
 177                 nouveau_gpuobj_ref(NULL, &pgt);
 178                 mutex_lock(&vm->mm.mutex);
 179         }
 180 }
 181
 182 static int
 183 nouveau_vm_map_pgt(struct nouveau_vm *vm, u32 pde, u32 type)
 184 {
 185         struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 186         struct nouveau_vm_pgd *vpgd;
 187         struct nouveau_gpuobj *pgt;
 188         int big = (type != vm->spg_shift);
 189         u32 pgt_size;
 190         int ret;
 191
 192         pgt_size  = (1 << (vm->pgt_bits + 12)) >> type;
 193         pgt_size *= 8;
 194
 195         mutex_unlock(&vm->mm.mutex);
 196         ret = nouveau_gpuobj_new(vm->dev, NULL, pgt_size, 0x1000,
 197                                  NVOBJ_FLAG_ZERO_ALLOC, &pgt);
 198         mutex_lock(&vm->mm.mutex);
 199         if (unlikely(ret))
 200                 return ret;
 201
 202         /* someone beat us to filling the PDE while we didn't have the lock */
 203         if (unlikely(vpgt->refcount[big]++)) {
 204                 mutex_unlock(&vm->mm.mutex);
 205                 nouveau_gpuobj_ref(NULL, &pgt);
 206                 mutex_lock(&vm->mm.mutex);
 207                 return 0;
 208         }
 209
 210         vpgt->obj[big] = pgt;
 211         list_for_each_entry(vpgd, &vm->pgd_list, head) {
 212                 vm->map_pgt(vpgd->obj, pde, vpgt->obj);
 213         }
 214
 215         return 0;
 216 }
 217
 218 int
 219 nouveau_vm_get(struct nouveau_vm *vm, u64 size, u32 page_shift,
 220                u32 access, struct nouveau_vma *vma)
 221 {
 222         u32 align = (1 << page_shift) >> 12;
 223         u32 msize = size >> 12;
 224         u32 fpde, lpde, pde;
 225         int ret;
 226
 227         mutex_lock(&vm->mm.mutex);
 228         ret = nouveau_mm_get(&vm->mm, page_shift, msize, 0, align, &vma->node);
 229         if (unlikely(ret != 0)) {
 230                 mutex_unlock(&vm->mm.mutex);
 231                 return ret;
 232         }
 233
 234         fpde = (vma->node->offset >> vm->pgt_bits);
 235         lpde = (vma->node->offset + vma->node->length - 1) >> vm->pgt_bits;
 236         for (pde = fpde; pde <= lpde; pde++) {
 237                 struct nouveau_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
 238                 int big = (vma->node->type != vm->spg_shift);
 239
 240                 if (likely(vpgt->refcount[big])) {
 241                         vpgt->refcount[big]++;
 242                         continue;
 243                 }
 244
 245                 ret = nouveau_vm_map_pgt(vm, pde, vma->node->type);
 246                 if (ret) {
 247                         if (pde != fpde)
 248                                 nouveau_vm_unmap_pgt(vm, big, fpde, pde - 1);
 249                         nouveau_mm_put(&vm->mm, vma->node);
 250                         mutex_unlock(&vm->mm.mutex);
 251                         vma->node = NULL;
 252                         return ret;
 253                 }
 254         }
 255         mutex_unlock(&vm->mm.mutex);
 256
 257         vma->vm     = vm;
 258         vma->offset = (u64)vma->node->offset << 12;
 259         vma->access = access;
 260         return 0;
 261 }
 262
 263 void
 264 nouveau_vm_put(struct nouveau_vma *vma)
 265 {
 266         struct nouveau_vm *vm = vma->vm;
 267         u32 fpde, lpde;
 268
 269         if (unlikely(vma->node == NULL))
 270                 return;
 271         fpde = (vma->node->offset >> vm->pgt_bits);
 272         lpde = (vma->node->offset + vma->node->length - 1) >> vm->pgt_bits;
 273
 274         mutex_lock(&vm->mm.mutex);
 275         nouveau_vm_unmap_pgt(vm, vma->node->type != vm->spg_shift, fpde, lpde);
 276         nouveau_mm_put(&vm->mm, vma->node);
 277         vma->node = NULL;
 278         mutex_unlock(&vm->mm.mutex);
 279 }
 280
 281 int
 282 nouveau_vm_new(struct drm_device *dev, u64 offset, u64 length, u64 mm_offset,
 283                struct nouveau_vm **pvm)
 284 {
 285         struct drm_nouveau_private *dev_priv = dev->dev_private;
 286         struct nouveau_vm *vm;
 287         u64 mm_length = (offset + length) - mm_offset;
 288         u32 block, pgt_bits;
 289         int ret;
 290
 291         vm = kzalloc(sizeof(*vm), GFP_KERNEL);
 292         if (!vm)
 293                 return -ENOMEM;
 294
 295         if (dev_priv->card_type == NV_50) {
 296                 vm->map_pgt = nv50_vm_map_pgt;
 297                 vm->map = nv50_vm_map;
 298                 vm->map_sg = nv50_vm_map_sg;
 299                 vm->unmap = nv50_vm_unmap;
 300                 vm->flush = nv50_vm_flush;
 301                 vm->spg_shift = 12;
 302                 vm->lpg_shift = 16;
 303
 304                 pgt_bits = 29;
 305                 block = (1 << pgt_bits);
 306                 if (length < block)
 307                         block = length;
 308
 309         } else
 310         if (dev_priv->card_type >= NV_C0) {
 311                 vm->map_pgt = nvc0_vm_map_pgt;
 312                 vm->map = nvc0_vm_map;
 313                 vm->map_sg = nvc0_vm_map_sg;
 314                 vm->unmap = nvc0_vm_unmap;
 315                 vm->flush = nvc0_vm_flush;
 316                 vm->spg_shift = 12;
 317                 vm->lpg_shift = 17;
 318                 pgt_bits = 27;
 319                 block = 4096;
 320         } else {
 321                 kfree(vm);
 322                 return -ENOSYS;
 323         }
 324
 325         vm->fpde   = offset >> pgt_bits;
 326         vm->lpde   = (offset + length - 1) >> pgt_bits;
 327         vm->pgt = kcalloc(vm->lpde - vm->fpde + 1, sizeof(*vm->pgt), GFP_KERNEL);
 328         if (!vm->pgt) {
 329                 kfree(vm);
 330                 return -ENOMEM;
 331         }
 332
 333         INIT_LIST_HEAD(&vm->pgd_list);
 334         vm->dev = dev;
 335         vm->refcount = 1;
 336         vm->pgt_bits = pgt_bits - 12;
 337
 338         ret = nouveau_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
 339                               block >> 12);
 340         if (ret) {
 341                 kfree(vm);
 342                 return ret;
 343         }
 344
 345         *pvm = vm;
 346         return 0;
 347 }
 348
 349 static int
 350 nouveau_vm_link(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)
 351 {
 352         struct nouveau_vm_pgd *vpgd;
 353         int i;
 354
 355         if (!pgd)
 356                 return 0;
 357
 358         vpgd = kzalloc(sizeof(*vpgd), GFP_KERNEL);
 359         if (!vpgd)
 360                 return -ENOMEM;
 361
 362         nouveau_gpuobj_ref(pgd, &vpgd->obj);
 363
 364         mutex_lock(&vm->mm.mutex);
 365         for (i = vm->fpde; i <= vm->lpde; i++)
 366                 vm->map_pgt(pgd, i, vm->pgt[i - vm->fpde].obj);
 367         list_add(&vpgd->head, &vm->pgd_list);
 368         mutex_unlock(&vm->mm.mutex);
 369         return 0;
 370 }
 371
 372 static void
 373 nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd)
 374 {
 375         struct nouveau_vm_pgd *vpgd, *tmp;
 376         struct nouveau_gpuobj *pgd = NULL;
 377
 378         if (!mpgd)
 379                 return;
 380
 381         mutex_lock(&vm->mm.mutex);
 382         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 383                 if (vpgd->obj == mpgd) {
 384                         pgd = vpgd->obj;
 385                         list_del(&vpgd->head);
 386                         kfree(vpgd);
 387                         break;
 388                 }
 389         }
 390         mutex_unlock(&vm->mm.mutex);
 391
 392         nouveau_gpuobj_ref(NULL, &pgd);
 393 }
 394
 395 static void
 396 nouveau_vm_del(struct nouveau_vm *vm)
 397 {
 398         struct nouveau_vm_pgd *vpgd, *tmp;
 399
 400         list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
 401                 nouveau_vm_unlink(vm, vpgd->obj);
 402         }
 403
 404         nouveau_mm_fini(&vm->mm);
 405         kfree(vm->pgt);
 406         kfree(vm);
 407 }
 408
 409 int
 410 nouveau_vm_ref(struct nouveau_vm *ref, struct nouveau_vm **ptr,
 411                struct nouveau_gpuobj *pgd)
 412 {
 413         struct nouveau_vm *vm;
 414         int ret;
 415
 416         vm = ref;
 417         if (vm) {
 418                 ret = nouveau_vm_link(vm, pgd);
 419                 if (ret)
 420                         return ret;
 421
 422                 vm->refcount++;
 423         }
 424
 425         vm = *ptr;
 426         *ptr = ref;
 427
 428         if (vm) {
 429                 nouveau_vm_unlink(vm, pgd);
 430
 431                 if (--vm->refcount == 0)
 432                         nouveau_vm_del(vm);
 433         }
 434
 435         return 0;
 436 }