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_mmap() - mmap &ttm_buffer_object
  54  * @gem: GEM object.
  55  * @vma: vm area.
  56  *
  57  * This function can be used as &drm_gem_object_funcs.mmap
  58  * callback.
  59  */
  60 int drm_gem_ttm_mmap(struct drm_gem_object *gem,
  61                      struct vm_area_struct *vma)
  62 {
  63         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  64         int ret;
  65
  66         ret = ttm_bo_mmap_obj(vma, bo);
  67         if (ret < 0)
  68                 return ret;
  69
  70         /*
  71          * ttm has its own object refcounting, so drop gem reference
  72          * to avoid double accounting counting.
  73          */
  74         drm_gem_object_put(gem);
  75
  76         return 0;
  77 }
  78 EXPORT_SYMBOL(drm_gem_ttm_mmap);
  79
  80 MODULE_DESCRIPTION("DRM gem ttm helpers");
  81 MODULE_LICENSE("GPL");