drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 #include <linux/pagemap.h>
   2 #include <linux/slab.h>
   3
   4 #include <subdev/fb.h>
   5
   6 #include "nouveau_drm.h"
   7 #include "nouveau_ttm.h"
   8
   9 struct nouveau_sgdma_be {
  10         /* this has to be the first field so populate/unpopulated in
  11          * nouve_bo.c works properly, otherwise have to move them here
  12          */
  13         struct ttm_dma_tt ttm;
  14         struct drm_device *dev;
  15         struct nouveau_mem *node;
  16 };
  17
  18 static void
  19 nouveau_sgdma_destroy(struct ttm_tt *ttm)
  20 {
  21         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  22
  23         if (ttm) {
  24                 ttm_dma_tt_fini(&nvbe->ttm);
  25                 kfree(nvbe);
  26         }
  27 }
  28
  29 static int
  30 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
  31 {
  32         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  33         struct nouveau_mem *node = mem->mm_node;
  34         u64 size = mem->num_pages << 12;
  35
  36         if (ttm->sg) {
  37                 node->sg = ttm->sg;
  38                 nouveau_vm_map_sg_table(&node->vma[0], 0, size, node);
  39         } else {
  40                 node->pages = nvbe->ttm.dma_address;
  41                 nouveau_vm_map_sg(&node->vma[0], 0, size, node);
  42         }
  43
  44         nvbe->node = node;
  45         return 0;
  46 }
  47
  48 static int
  49 nv04_sgdma_unbind(struct ttm_tt *ttm)
  50 {
  51         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  52         nouveau_vm_unmap(&nvbe->node->vma[0]);
  53         return 0;
  54 }
  55
  56 static struct ttm_backend_func nv04_sgdma_backend = {
  57         .bind                   = nv04_sgdma_bind,
  58         .unbind                 = nv04_sgdma_unbind,
  59         .destroy                = nouveau_sgdma_destroy
  60 };
  61
  62 static int
  63 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
  64 {
  65         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  66         struct nouveau_mem *node = mem->mm_node;
  67
  68         /* noop: bound in move_notify() */
  69         if (ttm->sg) {
  70                 node->sg = ttm->sg;
  71         } else
  72                 node->pages = nvbe->ttm.dma_address;
  73         return 0;
  74 }
  75
  76 static int
  77 nv50_sgdma_unbind(struct ttm_tt *ttm)
  78 {
  79         /* noop: unbound in move_notify() */
  80         return 0;
  81 }
  82
  83 static struct ttm_backend_func nv50_sgdma_backend = {
  84         .bind                   = nv50_sgdma_bind,
  85         .unbind                 = nv50_sgdma_unbind,
  86         .destroy                = nouveau_sgdma_destroy
  87 };
  88
  89 struct ttm_tt *
  90 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  91                          unsigned long size, uint32_t page_flags,
  92                          struct page *dummy_read_page)
  93 {
  94         struct nouveau_drm *drm = nouveau_bdev(bdev);
  95         struct nouveau_sgdma_be *nvbe;
  96
  97         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
  98         if (!nvbe)
  99                 return NULL;
 100
 101         nvbe->dev = drm->dev;
 102         if (nv_device(drm->device)->card_type < NV_50)
 103                 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
 104         else
 105                 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 106
 107         if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 108                 return NULL;
 109         return &nvbe->ttm.ttm;
 110 }