drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/pagemap.h>
   3 #include <linux/slab.h>
   4
   5 #include "nouveau_drv.h"
   6 #include "nouveau_mem.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 nouveau_mem *mem;
  15 };
  16
  17 static void
  18 nouveau_sgdma_destroy(struct ttm_tt *ttm)
  19 {
  20         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  21
  22         if (ttm) {
  23                 ttm_dma_tt_fini(&nvbe->ttm);
  24                 kfree(nvbe);
  25         }
  26 }
  27
  28 static int
  29 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
  30 {
  31         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  32         struct nouveau_mem *mem = nouveau_mem(reg);
  33         int ret;
  34
  35         ret = nouveau_mem_host(reg, &nvbe->ttm);
  36         if (ret)
  37                 return ret;
  38
  39         ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
  40         if (ret) {
  41                 nouveau_mem_fini(mem);
  42                 return ret;
  43         }
  44
  45         nvbe->mem = mem;
  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_mem_fini(nvbe->mem);
  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 *reg)
  65 {
  66         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  67         struct nouveau_mem *mem = nouveau_mem(reg);
  68         int ret;
  69
  70         ret = nouveau_mem_host(reg, &nvbe->ttm);
  71         if (ret)
  72                 return ret;
  73
  74         nvbe->mem = mem;
  75         return 0;
  76 }
  77
  78 static struct ttm_backend_func nv50_sgdma_backend = {
  79         .bind                   = nv50_sgdma_bind,
  80         .unbind                 = nv04_sgdma_unbind,
  81         .destroy                = nouveau_sgdma_destroy
  82 };
  83
  84 struct ttm_tt *
  85 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  86                          unsigned long size, uint32_t page_flags,
  87                          struct page *dummy_read_page)
  88 {
  89         struct nouveau_drm *drm = nouveau_bdev(bdev);
  90         struct nouveau_sgdma_be *nvbe;
  91
  92         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
  93         if (!nvbe)
  94                 return NULL;
  95
  96         if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
  97                 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
  98         else
  99                 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 100
 101         if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 102                 /*
 103                  * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
 104                  * and thus our nouveau_sgdma_destroy() hook, so we don't need
 105                  * to free nvbe here.
 106                  */
 107                 return NULL;
 108         return &nvbe->ttm.ttm;
 109 }