drivers/gpu/drm/drm_gem_ttm_helper.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/module.h>
   4
   5 #include <drm/drm_gem_ttm_helper.h>
   6
   7 /**
   8  * DOC: overview
   9  *
  10  * This library provides helper functions for gem objects backed by
  11  * ttm.
  12  */
  13
  14 /**
  15  * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
  16  * @p: DRM printer
  17  * @indent: Tab indentation level
  18  * @gem: GEM object
  19  *
  20  * This function can be used as &drm_gem_object_funcs.print_info
  21  * callback.
  22  */
  23 void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
  24                             const struct drm_gem_object *gem)
  25 {
  26         static const char * const plname[] = {
  27                 [ TTM_PL_SYSTEM ] = "system",
  28                 [ TTM_PL_TT     ] = "tt",
  29                 [ TTM_PL_VRAM   ] = "vram",
  30                 [ TTM_PL_PRIV   ] = "priv",
  31
  32                 [ 16 ]            = "cached",
  33                 [ 17 ]            = "uncached",
  34                 [ 18 ]            = "wc",
  35                 [ 19 ]            = "contig",
  36
  37                 [ 21 ]            = "pinned", /* NO_EVICT */
  38                 [ 22 ]            = "topdown",
  39         };
  40         const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  41
  42         drm_printf_indent(p, indent, "placement=");
  43         drm_print_bits(p, bo->mem.placement, plname, ARRAY_SIZE(plname));
  44         drm_printf(p, "\n");
  45
  46         if (bo->mem.bus.is_iomem)
  47                 drm_printf_indent(p, indent, "bus.offset=%lx\n",
  48                                   (unsigned long)bo->mem.bus.offset);
  49 }
  50 EXPORT_SYMBOL(drm_gem_ttm_print_info);
  51
  52 /**
  53  * drm_gem_ttm_vmap() - vmap &ttm_buffer_object
  54  * @gem: GEM object.
  55  * @map: [out] returns the dma-buf mapping.
  56  *
  57  * Maps a GEM object with ttm_bo_vmap(). This function can be used as
  58  * &drm_gem_object_funcs.vmap callback.
  59  *
  60  * Returns:
  61  * 0 on success, or a negative errno code otherwise.
  62  */
  63 int drm_gem_ttm_vmap(struct drm_gem_object *gem,
  64                      struct dma_buf_map *map)
  65 {
  66         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  67
  68         return ttm_bo_vmap(bo, map);
  69 }
  70 EXPORT_SYMBOL(drm_gem_ttm_vmap);
  71
  72 /**
  73  * drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object
  74  * @gem: GEM object.
  75  * @map: dma-buf mapping.
  76  *
  77  * Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as
  78  * &drm_gem_object_funcs.vmap callback.
  79  */
  80 void drm_gem_ttm_vunmap(struct drm_gem_object *gem,
  81                         struct dma_buf_map *map)
  82 {
  83         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  84
  85         ttm_bo_vunmap(bo, map);
  86 }
  87 EXPORT_SYMBOL(drm_gem_ttm_vunmap);
  88
  89 /**
  90  * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
  91  * @gem: GEM object.
  92  * @vma: vm area.
  93  *
  94  * This function can be used as &drm_gem_object_funcs.mmap
  95  * callback.
  96  */
  97 int drm_gem_ttm_mmap(struct drm_gem_object *gem,
  98                      struct vm_area_struct *vma)
  99 {
 100         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
 101         int ret;
 102
 103         ret = ttm_bo_mmap_obj(vma, bo);
 104         if (ret < 0)
 105                 return ret;
 106
 107         /*
 108          * ttm has its own object refcounting, so drop gem reference
 109          * to avoid double accounting counting.
 110          */
 111         drm_gem_object_put(gem);
 112
 113         return 0;
 114 }
 115 EXPORT_SYMBOL(drm_gem_ttm_mmap);
 116
 117 MODULE_DESCRIPTION("DRM gem ttm helpers");
 118 MODULE_LICENSE("GPL");