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
  35         if (ttm->sg) {
  36                 node->sg    = ttm->sg;
  37                 node->pages = NULL;
  38         } else {
  39                 node->sg    = NULL;
  40                 node->pages = nvbe->ttm.dma_address;
  41         }
  42         node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
  43
  44         nouveau_vm_map(&node->vma[0], node);
  45         nvbe->node = node;
  46         return 0;
  47 }
  48
  49 static int
  50 nv04_sgdma_unbind(struct ttm_tt *ttm)
  51 {
  52         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  53         nouveau_vm_unmap(&nvbe->node->vma[0]);
  54         return 0;
  55 }
  56
  57 static struct ttm_backend_func nv04_sgdma_backend = {
  58         .bind                   = nv04_sgdma_bind,
  59         .unbind                 = nv04_sgdma_unbind,
  60         .destroy                = nouveau_sgdma_destroy
  61 };
  62
  63 static int
  64 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
  65 {
  66         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  67         struct nouveau_mem *node = mem->mm_node;
  68
  69         /* noop: bound in move_notify() */
  70         if (ttm->sg) {
  71                 node->sg    = ttm->sg;
  72                 node->pages = NULL;
  73         } else {
  74                 node->sg    = NULL;
  75                 node->pages = nvbe->ttm.dma_address;
  76         }
  77         node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
  78         return 0;
  79 }
  80
  81 static int
  82 nv50_sgdma_unbind(struct ttm_tt *ttm)
  83 {
  84         /* noop: unbound in move_notify() */
  85         return 0;
  86 }
  87
  88 static struct ttm_backend_func nv50_sgdma_backend = {
  89         .bind                   = nv50_sgdma_bind,
  90         .unbind                 = nv50_sgdma_unbind,
  91         .destroy                = nouveau_sgdma_destroy
  92 };
  93
  94 struct ttm_tt *
  95 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  96                          unsigned long size, uint32_t page_flags,
  97                          struct page *dummy_read_page)
  98 {
  99         struct nouveau_drm *drm = nouveau_bdev(bdev);
 100         struct nouveau_sgdma_be *nvbe;
 101
 102         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 103         if (!nvbe)
 104                 return NULL;
 105
 106         nvbe->dev = drm->dev;
 107         if (nv_device(drm->device)->card_type < NV_50)
 108                 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
 109         else
 110                 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 111
 112         if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 113                 return NULL;
 114         return &nvbe->ttm.ttm;
 115 }