drm_gem_ttm_helper.c 1.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. #include <linux/module.h>
  3. #include <drm/drm_gem_ttm_helper.h>
  4. /**
  5. * DOC: overview
  6. *
  7. * This library provides helper functions for gem objects backed by
  8. * ttm.
  9. */
  10. /**
  11. * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
  12. * @p: DRM printer
  13. * @indent: Tab indentation level
  14. * @gem: GEM object
  15. *
  16. * This function can be used as &drm_gem_object_funcs.print_info
  17. * callback.
  18. */
  19. void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
  20. const struct drm_gem_object *gem)
  21. {
  22. static const char * const plname[] = {
  23. [ TTM_PL_SYSTEM ] = "system",
  24. [ TTM_PL_TT ] = "tt",
  25. [ TTM_PL_VRAM ] = "vram",
  26. [ TTM_PL_PRIV ] = "priv",
  27. [ 16 ] = "cached",
  28. [ 17 ] = "uncached",
  29. [ 18 ] = "wc",
  30. [ 19 ] = "contig",
  31. [ 21 ] = "pinned", /* NO_EVICT */
  32. [ 22 ] = "topdown",
  33. };
  34. const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  35. drm_printf_indent(p, indent, "placement=");
  36. drm_print_bits(p, bo->mem.placement, plname, ARRAY_SIZE(plname));
  37. drm_printf(p, "\n");
  38. if (bo->mem.bus.is_iomem)
  39. drm_printf_indent(p, indent, "bus.offset=%lx\n",
  40. (unsigned long)bo->mem.bus.offset);
  41. }
  42. EXPORT_SYMBOL(drm_gem_ttm_print_info);
  43. /**
  44. * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
  45. * @gem: GEM object.
  46. * @vma: vm area.
  47. *
  48. * This function can be used as &drm_gem_object_funcs.mmap
  49. * callback.
  50. */
  51. int drm_gem_ttm_mmap(struct drm_gem_object *gem,
  52. struct vm_area_struct *vma)
  53. {
  54. struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
  55. int ret;
  56. ret = ttm_bo_mmap_obj(vma, bo);
  57. if (ret < 0)
  58. return ret;
  59. /*
  60. * ttm has its own object refcounting, so drop gem reference
  61. * to avoid double accounting counting.
  62. */
  63. drm_gem_object_put(gem);
  64. return 0;
  65. }
  66. EXPORT_SYMBOL(drm_gem_ttm_mmap);
  67. MODULE_DESCRIPTION("DRM gem ttm helpers");
  68. MODULE_LICENSE("GPL");