drivers/gpu/drm/nouveau/nouveau_sgdma.c

   1 // SPDX-License-Identifier: MIT
   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 #include "nouveau_bo.h"
   9
  10 struct nouveau_sgdma_be {
  11         /* this has to be the first field so populate/unpopulated in
  12          * nouve_bo.c works properly, otherwise have to move them here
  13          */
  14         struct ttm_tt ttm;
  15         struct nouveau_mem *mem;
  16 };
  17
  18 void
  19 nouveau_sgdma_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
  20 {
  21         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  22
  23         if (ttm) {
  24                 nouveau_sgdma_unbind(bdev, ttm);
  25                 ttm_tt_destroy_common(bdev, ttm);
  26                 ttm_tt_fini(&nvbe->ttm);
  27                 kfree(nvbe);
  28         }
  29 }
  30
  31 int
  32 nouveau_sgdma_bind(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_resource *reg)
  33 {
  34         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  35         struct nouveau_drm *drm = nouveau_bdev(bdev);
  36         struct nouveau_mem *mem = nouveau_mem(reg);
  37         int ret;
  38
  39         if (nvbe->mem)
  40                 return 0;
  41
  42         ret = nouveau_mem_host(reg, &nvbe->ttm);
  43         if (ret)
  44                 return ret;
  45
  46         if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
  47                 ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
  48                 if (ret) {
  49                         nouveau_mem_fini(mem);
  50                         return ret;
  51                 }
  52         }
  53
  54         nvbe->mem = mem;
  55         return 0;
  56 }
  57
  58 void
  59 nouveau_sgdma_unbind(struct ttm_bo_device *bdev, struct ttm_tt *ttm)
  60 {
  61         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
  62         if (nvbe->mem) {
  63                 nouveau_mem_fini(nvbe->mem);
  64                 nvbe->mem = NULL;
  65         }
  66 }
  67
  68 struct ttm_tt *
  69 nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
  70 {
  71         struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
  72         struct nouveau_bo *nvbo = nouveau_bo(bo);
  73         struct nouveau_sgdma_be *nvbe;
  74         enum ttm_caching caching;
  75
  76         if (nvbo->force_coherent)
  77                 caching = ttm_uncached;
  78         else if (drm->agp.bridge)
  79                 caching = ttm_write_combined;
  80         else
  81                 caching = ttm_cached;
  82
  83         nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
  84         if (!nvbe)
  85                 return NULL;
  86
  87         if (ttm_dma_tt_init(&nvbe->ttm, bo, page_flags, caching)) {
  88                 kfree(nvbe);
  89                 return NULL;
  90         }
  91         return &nvbe->ttm;
  92 }