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.base=%lx\n",
48 				  (unsigned long)bo->mem.bus.base);
49 		drm_printf_indent(p, indent, "bus.offset=%lx\n",
50 				  (unsigned long)bo->mem.bus.offset);
51 	}
52 }
53 EXPORT_SYMBOL(drm_gem_ttm_print_info);
54 
55 /**
56  * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
57  * @gem: GEM object.
58  * @vma: vm area.
59  *
60  * This function can be used as &drm_gem_object_funcs.mmap
61  * callback.
62  */
63 int drm_gem_ttm_mmap(struct drm_gem_object *gem,
64 		     struct vm_area_struct *vma)
65 {
66 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
67 	int ret;
68 
69 	ret = ttm_bo_mmap_obj(vma, bo);
70 	if (ret < 0)
71 		return ret;
72 
73 	/*
74 	 * ttm has its own object refcounting, so drop gem reference
75 	 * to avoid double accounting counting.
76 	 */
77 	drm_gem_object_put(gem);
78 
79 	return 0;
80 }
81 EXPORT_SYMBOL(drm_gem_ttm_mmap);
82 
83 MODULE_DESCRIPTION("DRM gem ttm helpers");
84 MODULE_LICENSE("GPL");
85