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");
119