drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 #include "drmP.h"
   2 #include "nouveau_drv.h"
   3 #include <linux/pagemap.h>
   4 #include <linux/slab.h>
   5
   6 #define NV_CTXDMA_PAGE_SHIFT 12
   7 #define NV_CTXDMA_PAGE_SIZE  (1 << NV_CTXDMA_PAGE_SHIFT)
   8 #define NV_CTXDMA_PAGE_MASK  (NV_CTXDMA_PAGE_SIZE - 1)
   9
  10 struct nouveau_sgdma_be {
  11         struct ttm_backend backend;
  12         struct drm_device *dev;
  13
  14         dma_addr_t *pages;
  15         unsigned nr_pages;
  16         bool unmap_pages;
  17
  18         u64 offset;
  19         bool bound;
  20 };
  21
  22 static int
  23 nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
  24                        struct page **pages, struct page *dummy_read_page,
  25                        dma_addr_t *dma_addrs)
  26 {
  27         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  28         struct drm_device *dev = nvbe->dev;
  29         int i;
  30
  31         NV_DEBUG(nvbe->dev, "num_pages = %ld\n", num_pages);
  32
  33         nvbe->pages = dma_addrs;
  34         nvbe->nr_pages = num_pages;
  35         nvbe->unmap_pages = true;
  36
  37         /* this code path isn't called and is incorrect anyways */
  38         if (0) { /* dma_addrs[0] != DMA_ERROR_CODE) { */
  39                 nvbe->unmap_pages = false;
  40                 return 0;
  41         }
  42
  43         for (i = 0; i < num_pages; i++) {
  44                 nvbe->pages[i] = pci_map_page(dev->pdev, pages[i], 0,
  45                                               PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  46                 if (pci_dma_mapping_error(dev->pdev, nvbe->pages[i])) {
  47                         nvbe->nr_pages = --i;
  48                         be->func->clear(be);
  49                         return -EFAULT;
  50                 }
  51         }
  52
  53         return 0;
  54 }
  55
  56 static void
  57 nouveau_sgdma_clear(struct ttm_backend *be)
  58 {
  59         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  60         struct drm_device *dev = nvbe->dev;
  61
  62         if (nvbe->bound)
  63                 be->func->unbind(be);
  64
  65         if (nvbe->unmap_pages) {
  66                 while (nvbe->nr_pages--) {
  67                         pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
  68                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  69                 }
  70         }
  71 }
  72
  73 static void
  74 nouveau_sgdma_destroy(struct ttm_backend *be)
  75 {
  76         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  77
  78         if (be) {
  79                 NV_DEBUG(nvbe->dev, "\n");
  80
  81                 if (nvbe) {
  82                         if (nvbe->pages)
  83                                 be->func->clear(be);
  84                         kfree(nvbe);
  85                 }
  86         }
  87 }
  88
  89 static int
  90 nv04_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
  91 {
  92         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  93         struct drm_device *dev = nvbe->dev;
  94         struct drm_nouveau_private *dev_priv = dev->dev_private;
  95         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
  96         unsigned i, j, pte;
  97
  98         NV_DEBUG(dev, "pg=0x%lx\n", mem->start);
  99
 100         nvbe->offset = mem->start << PAGE_SHIFT;
 101         pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 102         for (i = 0; i < nvbe->nr_pages; i++) {
 103                 dma_addr_t dma_offset = nvbe->pages[i];
 104                 uint32_t offset_l = lower_32_bits(dma_offset);
 105
 106                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++) {
 107                         nv_wo32(gpuobj, (pte * 4) + 0, offset_l | 3);
 108                         offset_l += NV_CTXDMA_PAGE_SIZE;
 109                 }
 110         }
 111
 112         nvbe->bound = true;
 113         return 0;
 114 }
 115
 116 static int
 117 nv04_sgdma_unbind(struct ttm_backend *be)
 118 {
 119         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 120         struct drm_device *dev = nvbe->dev;
 121         struct drm_nouveau_private *dev_priv = dev->dev_private;
 122         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 123         unsigned i, j, pte;
 124
 125         NV_DEBUG(dev, "\n");
 126
 127         if (!nvbe->bound)
 128                 return 0;
 129
 130         pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 131         for (i = 0; i < nvbe->nr_pages; i++) {
 132                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++)
 133                         nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
 134         }
 135
 136         nvbe->bound = false;
 137         return 0;
 138 }
 139
 140 static struct ttm_backend_func nv04_sgdma_backend = {
 141         .populate               = nouveau_sgdma_populate,
 142         .clear                  = nouveau_sgdma_clear,
 143         .bind                   = nv04_sgdma_bind,
 144         .unbind                 = nv04_sgdma_unbind,
 145         .destroy                = nouveau_sgdma_destroy
 146 };
 147
 148 static void
 149 nv41_sgdma_flush(struct nouveau_sgdma_be *nvbe)
 150 {
 151         struct drm_device *dev = nvbe->dev;
 152
 153         nv_wr32(dev, 0x100810, 0x00000022);
 154         if (!nv_wait(dev, 0x100810, 0x00000100, 0x00000100))
 155                 NV_ERROR(dev, "vm flush timeout: 0x%08x\n",
 156                          nv_rd32(dev, 0x100810));
 157         nv_wr32(dev, 0x100810, 0x00000000);
 158 }
 159
 160 static int
 161 nv41_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
 162 {
 163         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 164         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 165         struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
 166         dma_addr_t *list = nvbe->pages;
 167         u32 pte = mem->start << 2;
 168         u32 cnt = nvbe->nr_pages;
 169
 170         nvbe->offset = mem->start << PAGE_SHIFT;
 171
 172         while (cnt--) {
 173                 nv_wo32(pgt, pte, (*list++ >> 7) | 1);
 174                 pte += 4;
 175         }
 176
 177         nv41_sgdma_flush(nvbe);
 178         nvbe->bound = true;
 179         return 0;
 180 }
 181
 182 static int
 183 nv41_sgdma_unbind(struct ttm_backend *be)
 184 {
 185         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 186         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 187         struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
 188         u32 pte = (nvbe->offset >> 12) << 2;
 189         u32 cnt = nvbe->nr_pages;
 190
 191         while (cnt--) {
 192                 nv_wo32(pgt, pte, 0x00000000);
 193                 pte += 4;
 194         }
 195
 196         nv41_sgdma_flush(nvbe);
 197         nvbe->bound = false;
 198         return 0;
 199 }
 200
 201 static struct ttm_backend_func nv41_sgdma_backend = {
 202         .populate               = nouveau_sgdma_populate,
 203         .clear                  = nouveau_sgdma_clear,
 204         .bind                   = nv41_sgdma_bind,
 205         .unbind                 = nv41_sgdma_unbind,
 206         .destroy                = nouveau_sgdma_destroy
 207 };
 208
 209 static void
 210 nv44_sgdma_flush(struct nouveau_sgdma_be *nvbe)
 211 {
 212         struct drm_device *dev = nvbe->dev;
 213
 214         nv_wr32(dev, 0x100814, (nvbe->nr_pages - 1) << 12);
 215         nv_wr32(dev, 0x100808, nvbe->offset | 0x20);
 216         if (!nv_wait(dev, 0x100808, 0x00000001, 0x00000001))
 217                 NV_ERROR(dev, "gart flush timeout: 0x%08x\n",
 218                          nv_rd32(dev, 0x100808));
 219         nv_wr32(dev, 0x100808, 0x00000000);
 220 }
 221
 222 static void
 223 nv44_sgdma_fill(struct nouveau_gpuobj *pgt, dma_addr_t *list, u32 base, u32 cnt)
 224 {
 225         struct drm_nouveau_private *dev_priv = pgt->dev->dev_private;
 226         dma_addr_t dummy = dev_priv->gart_info.dummy.addr;
 227         u32 pte, tmp[4];
 228
 229         pte   = base >> 2;
 230         base &= ~0x0000000f;
 231
 232         tmp[0] = nv_ro32(pgt, base + 0x0);
 233         tmp[1] = nv_ro32(pgt, base + 0x4);
 234         tmp[2] = nv_ro32(pgt, base + 0x8);
 235         tmp[3] = nv_ro32(pgt, base + 0xc);
 236         while (cnt--) {
 237                 u32 addr = list ? (*list++ >> 12) : (dummy >> 12);
 238                 switch (pte++ & 0x3) {
 239                 case 0:
 240                         tmp[0] &= ~0x07ffffff;
 241                         tmp[0] |= addr;
 242                         break;
 243                 case 1:
 244                         tmp[0] &= ~0xf8000000;
 245                         tmp[0] |= addr << 27;
 246                         tmp[1] &= ~0x003fffff;
 247                         tmp[1] |= addr >> 5;
 248                         break;
 249                 case 2:
 250                         tmp[1] &= ~0xffc00000;
 251                         tmp[1] |= addr << 22;
 252                         tmp[2] &= ~0x0001ffff;
 253                         tmp[2] |= addr >> 10;
 254                         break;
 255                 case 3:
 256                         tmp[2] &= ~0xfffe0000;
 257                         tmp[2] |= addr << 17;
 258                         tmp[3] &= ~0x00000fff;
 259                         tmp[3] |= addr >> 15;
 260                         break;
 261                 }
 262         }
 263
 264         tmp[3] |= 0x40000000;
 265
 266         nv_wo32(pgt, base + 0x0, tmp[0]);
 267         nv_wo32(pgt, base + 0x4, tmp[1]);
 268         nv_wo32(pgt, base + 0x8, tmp[2]);
 269         nv_wo32(pgt, base + 0xc, tmp[3]);
 270 }
 271
 272 static int
 273 nv44_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
 274 {
 275         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 276         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 277         struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
 278         dma_addr_t *list = nvbe->pages;
 279         u32 pte = mem->start << 2, tmp[4];
 280         u32 cnt = nvbe->nr_pages;
 281         int i;
 282
 283         nvbe->offset = mem->start << PAGE_SHIFT;
 284
 285         if (pte & 0x0000000c) {
 286                 u32  max = 4 - ((pte >> 2) & 0x3);
 287                 u32 part = (cnt > max) ? max : cnt;
 288                 nv44_sgdma_fill(pgt, list, pte, part);
 289                 pte  += (part << 2);
 290                 list += part;
 291                 cnt  -= part;
 292         }
 293
 294         while (cnt >= 4) {
 295                 for (i = 0; i < 4; i++)
 296                         tmp[i] = *list++ >> 12;
 297                 nv_wo32(pgt, pte + 0x0, tmp[0] >>  0 | tmp[1] << 27);
 298                 nv_wo32(pgt, pte + 0x4, tmp[1] >>  5 | tmp[2] << 22);
 299                 nv_wo32(pgt, pte + 0x8, tmp[2] >> 10 | tmp[3] << 17);
 300                 nv_wo32(pgt, pte + 0xc, tmp[3] >> 15 | 0x40000000);
 301                 pte  += 0x10;
 302                 cnt  -= 4;
 303         }
 304
 305         if (cnt)
 306                 nv44_sgdma_fill(pgt, list, pte, cnt);
 307
 308         nv44_sgdma_flush(nvbe);
 309         nvbe->bound = true;
 310         return 0;
 311 }
 312
 313 static int
 314 nv44_sgdma_unbind(struct ttm_backend *be)
 315 {
 316         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 317         struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
 318         struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
 319         u32 pte = (nvbe->offset >> 12) << 2;
 320         u32 cnt = nvbe->nr_pages;
 321
 322         if (pte & 0x0000000c) {
 323                 u32  max = 4 - ((pte >> 2) & 0x3);
 324                 u32 part = (cnt > max) ? max : cnt;
 325                 nv44_sgdma_fill(pgt, NULL, pte, part);
 326                 pte  += (part << 2);
 327                 cnt  -= part;
 328         }
 329
 330         while (cnt >= 4) {
 331                 nv_wo32(pgt, pte + 0x0, 0x00000000);
 332                 nv_wo32(pgt, pte + 0x4, 0x00000000);
 333                 nv_wo32(pgt, pte + 0x8, 0x00000000);
 334                 nv_wo32(pgt, pte + 0xc, 0x00000000);
 335                 pte  += 0x10;
 336                 cnt  -= 4;
 337         }
 338
 339         if (cnt)
 340                 nv44_sgdma_fill(pgt, NULL, pte, cnt);
 341
 342         nv44_sgdma_flush(nvbe);
 343         nvbe->bound = false;
 344         return 0;
 345 }
 346
 347 static struct ttm_backend_func nv44_sgdma_backend = {
 348         .populate               = nouveau_sgdma_populate,
 349         .clear                  = nouveau_sgdma_clear,
 350         .bind                   = nv44_sgdma_bind,
 351         .unbind                 = nv44_sgdma_unbind,
 352         .destroy                = nouveau_sgdma_destroy
 353 };
 354
 355 static int
 356 nv50_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
 357 {
 358         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 359         struct nouveau_mem *node = mem->mm_node;
 360         /* noop: bound in move_notify() */
 361         node->pages = nvbe->pages;
 362         nvbe->pages = (dma_addr_t *)node;
 363         nvbe->bound = true;
 364         return 0;
 365 }
 366
 367 static int
 368 nv50_sgdma_unbind(struct ttm_backend *be)
 369 {
 370         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 371         struct nouveau_mem *node = (struct nouveau_mem *)nvbe->pages;
 372         /* noop: unbound in move_notify() */
 373         nvbe->pages = node->pages;
 374         node->pages = NULL;
 375         nvbe->bound = false;
 376         return 0;
 377 }
 378
 379 static struct ttm_backend_func nv50_sgdma_backend = {
 380         .populate               = nouveau_sgdma_populate,
 381         .clear                  = nouveau_sgdma_clear,
 382         .bind                   = nv50_sgdma_bind,
 383         .unbind                 = nv50_sgdma_unbind,
 384         .destroy                = nouveau_sgdma_destroy
 385 };
 386
 387 struct ttm_backend *
 388 nouveau_sgdma_init_ttm(struct drm_device *dev)
 389 {
 390         struct drm_nouveau_private *dev_priv = dev->dev_private;
 391         struct nouveau_sgdma_be *nvbe;
 392
 393         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 394         if (!nvbe)
 395                 return NULL;
 396
 397         nvbe->dev = dev;
 398
 399         nvbe->backend.func = dev_priv->gart_info.func;
 400         return &nvbe->backend;
 401 }
 402
 403 int
 404 nouveau_sgdma_init(struct drm_device *dev)
 405 {
 406         struct drm_nouveau_private *dev_priv = dev->dev_private;
 407         struct nouveau_gpuobj *gpuobj = NULL;
 408         u32 aper_size, align;
 409         int ret;
 410
 411         if (dev_priv->card_type >= NV_40 && pci_is_pcie(dev->pdev))
 412                 aper_size = 512 * 1024 * 1024;
 413         else
 414                 aper_size = 64 * 1024 * 1024;
 415
 416         /* Dear NVIDIA, NV44+ would like proper present bits in PTEs for
 417          * christmas.  The cards before it have them, the cards after
 418          * it have them, why is NV44 so unloved?
 419          */
 420         dev_priv->gart_info.dummy.page = alloc_page(GFP_DMA32 | GFP_KERNEL);
 421         if (!dev_priv->gart_info.dummy.page)
 422                 return -ENOMEM;
 423
 424         dev_priv->gart_info.dummy.addr =
 425                 pci_map_page(dev->pdev, dev_priv->gart_info.dummy.page,
 426                              0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 427         if (pci_dma_mapping_error(dev->pdev, dev_priv->gart_info.dummy.addr)) {
 428                 NV_ERROR(dev, "error mapping dummy page\n");
 429                 __free_page(dev_priv->gart_info.dummy.page);
 430                 dev_priv->gart_info.dummy.page = NULL;
 431                 return -ENOMEM;
 432         }
 433
 434         if (dev_priv->card_type >= NV_50) {
 435                 dev_priv->gart_info.aper_base = 0;
 436                 dev_priv->gart_info.aper_size = aper_size;
 437                 dev_priv->gart_info.type = NOUVEAU_GART_HW;
 438                 dev_priv->gart_info.func = &nv50_sgdma_backend;
 439         } else
 440         if (0 && pci_is_pcie(dev->pdev) &&
 441             dev_priv->chipset > 0x40 && dev_priv->chipset != 0x45) {
 442                 if (nv44_graph_class(dev)) {
 443                         dev_priv->gart_info.func = &nv44_sgdma_backend;
 444                         align = 512 * 1024;
 445                 } else {
 446                         dev_priv->gart_info.func = &nv41_sgdma_backend;
 447                         align = 16;
 448                 }
 449
 450                 ret = nouveau_gpuobj_new(dev, NULL, aper_size / 1024, align,
 451                                          NVOBJ_FLAG_ZERO_ALLOC |
 452                                          NVOBJ_FLAG_ZERO_FREE, &gpuobj);
 453                 if (ret) {
 454                         NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
 455                         return ret;
 456                 }
 457
 458                 dev_priv->gart_info.sg_ctxdma = gpuobj;
 459                 dev_priv->gart_info.aper_base = 0;
 460                 dev_priv->gart_info.aper_size = aper_size;
 461                 dev_priv->gart_info.type = NOUVEAU_GART_HW;
 462         } else {
 463                 ret = nouveau_gpuobj_new(dev, NULL, (aper_size / 1024) + 8, 16,
 464                                          NVOBJ_FLAG_ZERO_ALLOC |
 465                                          NVOBJ_FLAG_ZERO_FREE, &gpuobj);
 466                 if (ret) {
 467                         NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
 468                         return ret;
 469                 }
 470
 471                 nv_wo32(gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
 472                                    (1 << 12) /* PT present */ |
 473                                    (0 << 13) /* PT *not* linear */ |
 474                                    (0 << 14) /* RW */ |
 475                                    (2 << 16) /* PCI */);
 476                 nv_wo32(gpuobj, 4, aper_size - 1);
 477
 478                 dev_priv->gart_info.sg_ctxdma = gpuobj;
 479                 dev_priv->gart_info.aper_base = 0;
 480                 dev_priv->gart_info.aper_size = aper_size;
 481                 dev_priv->gart_info.type = NOUVEAU_GART_PDMA;
 482                 dev_priv->gart_info.func = &nv04_sgdma_backend;
 483         }
 484
 485         return 0;
 486 }
 487
 488 void
 489 nouveau_sgdma_takedown(struct drm_device *dev)
 490 {
 491         struct drm_nouveau_private *dev_priv = dev->dev_private;
 492
 493         nouveau_gpuobj_ref(NULL, &dev_priv->gart_info.sg_ctxdma);
 494
 495         if (dev_priv->gart_info.dummy.page) {
 496                 pci_unmap_page(dev->pdev, dev_priv->gart_info.dummy.addr,
 497                                PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 498                 __free_page(dev_priv->gart_info.dummy.page);
 499                 dev_priv->gart_info.dummy.page = NULL;
 500         }
 501 }
 502
 503 uint32_t
 504 nouveau_sgdma_get_physical(struct drm_device *dev, uint32_t offset)
 505 {
 506         struct drm_nouveau_private *dev_priv = dev->dev_private;
 507         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 508         int pte = (offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
 509
 510         BUG_ON(dev_priv->card_type >= NV_50);
 511
 512         return (nv_ro32(gpuobj, 4 * pte) & ~NV_CTXDMA_PAGE_MASK) |
 513                 (offset & NV_CTXDMA_PAGE_MASK);
 514 }