SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 #include "drmP.h"
   2 #include "nouveau_drv.h"
   3 #include <linux/pagemap.h>
   4
   5 #define NV_CTXDMA_PAGE_SHIFT 12
   6 #define NV_CTXDMA_PAGE_SIZE  (1 << NV_CTXDMA_PAGE_SHIFT)
   7 #define NV_CTXDMA_PAGE_MASK  (NV_CTXDMA_PAGE_SIZE - 1)
   8
   9 struct nouveau_sgdma_be {
  10         struct ttm_backend backend;
  11         struct drm_device *dev;
  12
  13         dma_addr_t *pages;
  14         unsigned nr_pages;
  15
  16         unsigned pte_start;
  17         bool bound;
  18 };
  19
  20 static int
  21 nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
  22                        struct page **pages, struct page *dummy_read_page)
  23 {
  24         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  25         struct drm_device *dev = nvbe->dev;
  26
  27         NV_DEBUG(nvbe->dev, "num_pages = %ld\n", num_pages);
  28
  29         if (nvbe->pages)
  30                 return -EINVAL;
  31
  32         nvbe->pages = kmalloc(sizeof(dma_addr_t) * num_pages, GFP_KERNEL);
  33         if (!nvbe->pages)
  34                 return -ENOMEM;
  35
  36         nvbe->nr_pages = 0;
  37         while (num_pages--) {
  38                 nvbe->pages[nvbe->nr_pages] =
  39                         pci_map_page(dev->pdev, pages[nvbe->nr_pages], 0,
  40                                      PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  41                 if (pci_dma_mapping_error(dev->pdev,
  42                                           nvbe->pages[nvbe->nr_pages])) {
  43                         be->func->clear(be);
  44                         return -EFAULT;
  45                 }
  46
  47                 nvbe->nr_pages++;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static void
  54 nouveau_sgdma_clear(struct ttm_backend *be)
  55 {
  56         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  57         struct drm_device *dev;
  58
  59         if (nvbe && nvbe->pages) {
  60                 dev = nvbe->dev;
  61                 NV_DEBUG(dev, "\n");
  62
  63                 if (nvbe->bound)
  64                         be->func->unbind(be);
  65
  66                 while (nvbe->nr_pages--) {
  67                         pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
  68                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
  69                 }
  70                 kfree(nvbe->pages);
  71                 nvbe->pages = NULL;
  72                 nvbe->nr_pages = 0;
  73         }
  74 }
  75
  76 static inline unsigned
  77 nouveau_sgdma_pte(struct drm_device *dev, uint64_t offset)
  78 {
  79         struct drm_nouveau_private *dev_priv = dev->dev_private;
  80         unsigned pte = (offset >> NV_CTXDMA_PAGE_SHIFT);
  81
  82         if (dev_priv->card_type < NV_50)
  83                 return pte + 2;
  84
  85         return pte << 1;
  86 }
  87
  88 static int
  89 nouveau_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
  90 {
  91         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
  92         struct drm_device *dev = nvbe->dev;
  93         struct drm_nouveau_private *dev_priv = dev->dev_private;
  94         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
  95         unsigned i, j, pte;
  96
  97         NV_DEBUG(dev, "pg=0x%lx\n", mem->mm_node->start);
  98
  99         dev_priv->engine.instmem.prepare_access(nvbe->dev, true);
 100         pte = nouveau_sgdma_pte(nvbe->dev, mem->mm_node->start << PAGE_SHIFT);
 101         nvbe->pte_start = pte;
 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                 uint32_t offset_h = upper_32_bits(dma_offset);
 106
 107                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++) {
 108                         if (dev_priv->card_type < NV_50)
 109                                 nv_wo32(dev, gpuobj, pte++, offset_l | 3);
 110                         else {
 111                                 nv_wo32(dev, gpuobj, pte++, offset_l | 0x21);
 112                                 nv_wo32(dev, gpuobj, pte++, offset_h & 0xff);
 113                         }
 114
 115                         dma_offset += NV_CTXDMA_PAGE_SIZE;
 116                 }
 117         }
 118         dev_priv->engine.instmem.finish_access(nvbe->dev);
 119
 120         if (dev_priv->card_type == NV_50) {
 121                 nv_wr32(dev, 0x100c80, 0x00050001);
 122                 if (!nv_wait(0x100c80, 0x00000001, 0x00000000)) {
 123                         NV_ERROR(dev, "timeout: (0x100c80 & 1) == 0 (2)\n");
 124                         NV_ERROR(dev, "0x100c80 = 0x%08x\n",
 125                                                 nv_rd32(dev, 0x100c80));
 126                         return -EBUSY;
 127                 }
 128
 129                 nv_wr32(dev, 0x100c80, 0x00000001);
 130                 if (!nv_wait(0x100c80, 0x00000001, 0x00000000)) {
 131                         NV_ERROR(dev, "timeout: (0x100c80 & 1) == 0 (2)\n");
 132                         NV_ERROR(dev, "0x100c80 = 0x%08x\n",
 133                                                 nv_rd32(dev, 0x100c80));
 134                         return -EBUSY;
 135                 }
 136         }
 137
 138         nvbe->bound = true;
 139         return 0;
 140 }
 141
 142 static int
 143 nouveau_sgdma_unbind(struct ttm_backend *be)
 144 {
 145         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 146         struct drm_device *dev = nvbe->dev;
 147         struct drm_nouveau_private *dev_priv = dev->dev_private;
 148         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 149         unsigned i, j, pte;
 150
 151         NV_DEBUG(dev, "\n");
 152
 153         if (!nvbe->bound)
 154                 return 0;
 155
 156         dev_priv->engine.instmem.prepare_access(nvbe->dev, true);
 157         pte = nvbe->pte_start;
 158         for (i = 0; i < nvbe->nr_pages; i++) {
 159                 dma_addr_t dma_offset = dev_priv->gart_info.sg_dummy_bus;
 160
 161                 for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++) {
 162                         if (dev_priv->card_type < NV_50)
 163                                 nv_wo32(dev, gpuobj, pte++, dma_offset | 3);
 164                         else {
 165                                 nv_wo32(dev, gpuobj, pte++, dma_offset | 0x21);
 166                                 nv_wo32(dev, gpuobj, pte++, 0x00000000);
 167                         }
 168
 169                         dma_offset += NV_CTXDMA_PAGE_SIZE;
 170                 }
 171         }
 172         dev_priv->engine.instmem.finish_access(nvbe->dev);
 173
 174         nvbe->bound = false;
 175         return 0;
 176 }
 177
 178 static void
 179 nouveau_sgdma_destroy(struct ttm_backend *be)
 180 {
 181         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
 182
 183         if (be) {
 184                 NV_DEBUG(nvbe->dev, "\n");
 185
 186                 if (nvbe) {
 187                         if (nvbe->pages)
 188                                 be->func->clear(be);
 189                         kfree(nvbe);
 190                 }
 191         }
 192 }
 193
 194 static struct ttm_backend_func nouveau_sgdma_backend = {
 195         .populate               = nouveau_sgdma_populate,
 196         .clear                  = nouveau_sgdma_clear,
 197         .bind                   = nouveau_sgdma_bind,
 198         .unbind                 = nouveau_sgdma_unbind,
 199         .destroy                = nouveau_sgdma_destroy
 200 };
 201
 202 struct ttm_backend *
 203 nouveau_sgdma_init_ttm(struct drm_device *dev)
 204 {
 205         struct drm_nouveau_private *dev_priv = dev->dev_private;
 206         struct nouveau_sgdma_be *nvbe;
 207
 208         if (!dev_priv->gart_info.sg_ctxdma)
 209                 return NULL;
 210
 211         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 212         if (!nvbe)
 213                 return NULL;
 214
 215         nvbe->dev = dev;
 216
 217         nvbe->backend.func      = &nouveau_sgdma_backend;
 218
 219         return &nvbe->backend;
 220 }
 221
 222 int
 223 nouveau_sgdma_init(struct drm_device *dev)
 224 {
 225         struct drm_nouveau_private *dev_priv = dev->dev_private;
 226         struct nouveau_gpuobj *gpuobj = NULL;
 227         uint32_t aper_size, obj_size;
 228         int i, ret;
 229
 230         if (dev_priv->card_type < NV_50) {
 231                 aper_size = (64 * 1024 * 1024);
 232                 obj_size  = (aper_size >> NV_CTXDMA_PAGE_SHIFT) * 4;
 233                 obj_size += 8; /* ctxdma header */
 234         } else {
 235                 /* 1 entire VM page table */
 236                 aper_size = (512 * 1024 * 1024);
 237                 obj_size  = (aper_size >> NV_CTXDMA_PAGE_SHIFT) * 8;
 238         }
 239
 240         ret = nouveau_gpuobj_new(dev, NULL, obj_size, 16,
 241                                       NVOBJ_FLAG_ALLOW_NO_REFS |
 242                                       NVOBJ_FLAG_ZERO_ALLOC |
 243                                       NVOBJ_FLAG_ZERO_FREE, &gpuobj);
 244         if (ret) {
 245                 NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
 246                 return ret;
 247         }
 248
 249         dev_priv->gart_info.sg_dummy_page =
 250                 alloc_page(GFP_KERNEL|__GFP_DMA32);
 251         set_bit(PG_locked, &dev_priv->gart_info.sg_dummy_page->flags);
 252         dev_priv->gart_info.sg_dummy_bus =
 253                 pci_map_page(dev->pdev, dev_priv->gart_info.sg_dummy_page, 0,
 254                              PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 255
 256         dev_priv->engine.instmem.prepare_access(dev, true);
 257         if (dev_priv->card_type < NV_50) {
 258                 /* Maybe use NV_DMA_TARGET_AGP for PCIE? NVIDIA do this, and
 259                  * confirmed to work on c51.  Perhaps means NV_DMA_TARGET_PCIE
 260                  * on those cards? */
 261                 nv_wo32(dev, gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
 262                                        (1 << 12) /* PT present */ |
 263                                        (0 << 13) /* PT *not* linear */ |
 264                                        (NV_DMA_ACCESS_RW  << 14) |
 265                                        (NV_DMA_TARGET_PCI << 16));
 266                 nv_wo32(dev, gpuobj, 1, aper_size - 1);
 267                 for (i = 2; i < 2 + (aper_size >> 12); i++) {
 268                         nv_wo32(dev, gpuobj, i,
 269                                     dev_priv->gart_info.sg_dummy_bus | 3);
 270                 }
 271         } else {
 272                 for (i = 0; i < obj_size; i += 8) {
 273                         nv_wo32(dev, gpuobj, (i+0)/4,
 274                                     dev_priv->gart_info.sg_dummy_bus | 0x21);
 275                         nv_wo32(dev, gpuobj, (i+4)/4, 0);
 276                 }
 277         }
 278         dev_priv->engine.instmem.finish_access(dev);
 279
 280         dev_priv->gart_info.type      = NOUVEAU_GART_SGDMA;
 281         dev_priv->gart_info.aper_base = 0;
 282         dev_priv->gart_info.aper_size = aper_size;
 283         dev_priv->gart_info.sg_ctxdma = gpuobj;
 284         return 0;
 285 }
 286
 287 void
 288 nouveau_sgdma_takedown(struct drm_device *dev)
 289 {
 290         struct drm_nouveau_private *dev_priv = dev->dev_private;
 291
 292         if (dev_priv->gart_info.sg_dummy_page) {
 293                 pci_unmap_page(dev->pdev, dev_priv->gart_info.sg_dummy_bus,
 294                                NV_CTXDMA_PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 295                 unlock_page(dev_priv->gart_info.sg_dummy_page);
 296                 __free_page(dev_priv->gart_info.sg_dummy_page);
 297                 dev_priv->gart_info.sg_dummy_page = NULL;
 298                 dev_priv->gart_info.sg_dummy_bus = 0;
 299         }
 300
 301         nouveau_gpuobj_del(dev, &dev_priv->gart_info.sg_ctxdma);
 302 }
 303
 304 int
 305 nouveau_sgdma_get_page(struct drm_device *dev, uint32_t offset, uint32_t *page)
 306 {
 307         struct drm_nouveau_private *dev_priv = dev->dev_private;
 308         struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
 309         struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
 310         int pte;
 311
 312         pte = (offset >> NV_CTXDMA_PAGE_SHIFT);
 313         if (dev_priv->card_type < NV_50) {
 314                 instmem->prepare_access(dev, false);
 315                 *page = nv_ro32(dev, gpuobj, (pte + 2)) & ~NV_CTXDMA_PAGE_MASK;
 316                 instmem->finish_access(dev);
 317                 return 0;
 318         }
 319
 320         NV_ERROR(dev, "Unimplemented on NV50\n");
 321         return -EINVAL;
 322 }