drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 #include <linux/pagemap.h>
   2 #include <linux/slab.h>
   3
   4 #include "nouveau_drv.h"
   5 #include "nouveau_mem.h"
   6 #include "nouveau_ttm.h"
   7
   8 struct nouveau_sgdma_be {
   9         /* this has to be the first field so populate/unpopulated in
  10          * nouve_bo.c works properly, otherwise have to move them here
  11          */
  12         struct ttm_dma_tt ttm;
  13         struct nouveau_mem *mem;
  14 };
  15
  16 static void
  17 nouveau_sgdma_destroy(struct ttm_tt *ttm)
  18 {
  19         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  20
  21         if (ttm) {
  22                 ttm_dma_tt_fini(&nvbe->ttm);
  23                 kfree(nvbe);
  24         }
  25 }
  26
  27 static int
  28 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
  29 {
  30         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  31         struct nouveau_mem *mem = nouveau_mem(reg);
  32         int ret;
  33
  34         ret = nouveau_mem_host(reg, &nvbe->ttm);
  35         if (ret)
  36                 return ret;
  37
  38         ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
  39         if (ret) {
  40                 nouveau_mem_fini(mem);
  41                 return ret;
  42         }
  43
  44         nvbe->mem = mem;
  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_mem_fini(nvbe->mem);
  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 *reg)
  64 {
  65         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  66         struct nouveau_mem *mem = nouveau_mem(reg);
  67         int ret;
  68
  69         ret = nouveau_mem_host(reg, &nvbe->ttm);
  70         if (ret)
  71                 return ret;
  72
  73         nvbe->mem = mem;
  74         return 0;
  75 }
  76
  77 static struct ttm_backend_func nv50_sgdma_backend = {
  78         .bind                   = nv50_sgdma_bind,
  79         .unbind                 = nv04_sgdma_unbind,
  80         .destroy                = nouveau_sgdma_destroy
  81 };
  82
  83 struct ttm_tt *
  84 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  85                          unsigned long size, uint32_t page_flags,
  86                          struct page *dummy_read_page)
  87 {
  88         struct nouveau_drm *drm = nouveau_bdev(bdev);
  89         struct nouveau_sgdma_be *nvbe;
  90
  91         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
  92         if (!nvbe)
  93                 return NULL;
  94
  95         if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
  96                 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
  97         else
  98                 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
  99
 100         if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 101                 /*
 102                  * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
 103                  * and thus our nouveau_sgdma_destroy() hook, so we don't need
 104                  * to free nvbe here.
 105                  */
 106                 return NULL;
 107         return &nvbe->ttm.ttm;
 108 }