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 */
drm_gem_ttm_print_info(struct drm_printer * p,unsigned int indent,const struct drm_gem_object * gem)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 */
drm_gem_ttm_mmap(struct drm_gem_object * gem,struct vm_area_struct * vma)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");
82
