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

   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
  10struct 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
  18void
  19nouveau_sgdma_destroy(struct ttm_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
  31int
  32nouveau_sgdma_bind(struct ttm_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
  58void
  59nouveau_sgdma_unbind(struct ttm_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
  68struct ttm_tt *
  69nouveau_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_sg_tt_init(&nvbe->ttm, bo, page_flags, caching)) {
  88                kfree(nvbe);
  89                return NULL;
  90        }
  91        return &nvbe->ttm;
  92}
  93