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_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 nvkm_mem *node;
  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 nvkm_mem *node = reg->mm_node;
  32
  33         if (ttm->sg) {
  34                 node->sg    = ttm->sg;
  35                 node->pages = NULL;
  36         } else {
  37                 node->sg    = NULL;
  38                 node->pages = nvbe->ttm.dma_address;
  39         }
  40         node->size = (reg->num_pages << PAGE_SHIFT) >> 12;
  41
  42         nvkm_vm_map(&node->vma[0], node);
  43         nvbe->node = node;
  44         return 0;
  45 }
  46
  47 static int
  48 nv04_sgdma_unbind(struct ttm_tt *ttm)
  49 {
  50         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  51         nvkm_vm_unmap(&nvbe->node->vma[0]);
  52         return 0;
  53 }
  54
  55 static struct ttm_backend_func nv04_sgdma_backend = {
  56         .bind                   = nv04_sgdma_bind,
  57         .unbind                 = nv04_sgdma_unbind,
  58         .destroy                = nouveau_sgdma_destroy
  59 };
  60
  61 static int
  62 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *reg)
  63 {
  64         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  65         struct nvkm_mem *node = reg->mm_node;
  66
  67         /* noop: bound in move_notify() */
  68         if (ttm->sg) {
  69                 node->sg    = ttm->sg;
  70                 node->pages = NULL;
  71         } else {
  72                 node->sg    = NULL;
  73                 node->pages = nvbe->ttm.dma_address;
  74         }
  75         node->size = (reg->num_pages << PAGE_SHIFT) >> 12;
  76         return 0;
  77 }
  78
  79 static int
  80 nv50_sgdma_unbind(struct ttm_tt *ttm)
  81 {
  82         /* noop: unbound in move_notify() */
  83         return 0;
  84 }
  85
  86 static struct ttm_backend_func nv50_sgdma_backend = {
  87         .bind                   = nv50_sgdma_bind,
  88         .unbind                 = nv50_sgdma_unbind,
  89         .destroy                = nouveau_sgdma_destroy
  90 };
  91
  92 struct ttm_tt *
  93 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
  94                          unsigned long size, uint32_t page_flags,
  95                          struct page *dummy_read_page)
  96 {
  97         struct nouveau_drm *drm = nouveau_bdev(bdev);
  98         struct nouveau_sgdma_be *nvbe;
  99
 100         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
 101         if (!nvbe)
 102                 return NULL;
 103
 104         if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
 105                 nvbe->ttm.ttm.func = &nv04_sgdma_backend;
 106         else
 107                 nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 108
 109         if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
 110                 /*
 111                  * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
 112                  * and thus our nouveau_sgdma_destroy() hook, so we don't need
 113                  * to free nvbe here.
 114                  */
 115                 return NULL;
 116         return &nvbe->ttm.ttm;
 117 }