LXR linux/drivers/gpu/drm/nouveau/nouveau

   1#include <linux/pagemap.h>
   2#include <linux/slab.h>
   3
   4#include "nouveau_drv.h"
   5#include "nouveau_ttm.h"
   6
   7struct nouveau_sgdma_be {
   8        /* this has to be the first field so populate/unpopulated in
   9         * nouve_bo.c works properly, otherwise have to move them here
  10         */
  11        struct ttm_dma_tt ttm;
  12        struct nvkm_mem *node;
  13};
  14
  15static void
  16nouveau_sgdma_destroy(struct ttm_tt *ttm)
  17{
  18        struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  19
  20        if (ttm) {
  21                ttm_dma_tt_fini(&nvbe->ttm);
  22                kfree(nvbe);
  23        }
  24}
  25
  26static int
  27nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
  28{
  29        struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  30        struct nvkm_mem *node = mem->mm_node;
  31
  32        if (ttm->sg) {
  33                node->sg    = ttm->sg;
  34                node->pages = NULL;
  35        } else {
  36                node->sg    = NULL;
  37                node->pages = nvbe->ttm.dma_address;
  38        }
  39        node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
  40
  41        nvkm_vm_map(&node->vma[0], node);
  42        nvbe->node = node;
  43        return 0;
  44}
  45
  46static int
  47nv04_sgdma_unbind(struct ttm_tt *ttm)
  48{
  49        struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  50        nvkm_vm_unmap(&nvbe->node->vma[0]);
  51        return 0;
  52}
  53
  54static struct ttm_backend_func nv04_sgdma_backend = {
  55        .bind                   = nv04_sgdma_bind,
  56        .unbind                 = nv04_sgdma_unbind,
  57        .destroy                = nouveau_sgdma_destroy
  58};
  59
  60static int
  61nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
  62{
  63        struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  64        struct nvkm_mem *node = mem->mm_node;
  65
  66        /* noop: bound in move_notify() */
  67        if (ttm->sg) {
  68                node->sg    = ttm->sg;
  69                node->pages = NULL;
  70        } else {
  71                node->sg    = NULL;
  72                node->pages = nvbe->ttm.dma_address;
  73        }
  74        node->size = (mem->num_pages << PAGE_SHIFT) >> 12;
  75        return 0;
  76}
  77
  78static int
  79nv50_sgdma_unbind(struct ttm_tt *ttm)
  80{
  81        /* noop: unbound in move_notify() */
  82        return 0;
  83}
  84
  85static struct ttm_backend_func nv50_sgdma_backend = {
  86        .bind                   = nv50_sgdma_bind,
  87        .unbind                 = nv50_sgdma_unbind,
  88        .destroy                = nouveau_sgdma_destroy
  89};
  90
  91struct ttm_tt *
  92nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  93                         unsigned long size, uint32_t page_flags,
  94                         struct page *dummy_read_page)
  95{
  96        struct nouveau_drm *drm = nouveau_bdev(bdev);
  97        struct nouveau_sgdma_be *nvbe;
  98
  99        nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 100        if (!nvbe)
 101                return NULL;
 102
 103        if (drm->device.info.family < NV_DEVICE_INFO_V0_TESLA)
 104                nvbe->ttm.ttm.func = &nv04_sgdma_backend;
 105        else
 106                nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 107
 108        if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 109                /*
 110                 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
 111                 * and thus our nouveau_sgdma_destroy() hook, so we don't need
 112                 * to free nvbe here.
 113                 */
 114                return NULL;
 115        return &nvbe->ttm.ttm;
 116}
 117