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->resource->placement, plname, ARRAY_SIZE(plname));
44 drm_printf(p, "\n");
45
46 if (bo->resource->bus.is_iomem)
47 drm_printf_indent(p, indent, "bus.offset=%lx\n",
48 (unsigned long)bo->resource->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 */
drm_gem_ttm_vmap(struct drm_gem_object * gem,struct iosys_map * map)63 int drm_gem_ttm_vmap(struct drm_gem_object *gem,
64 struct iosys_map *map)
65 {
66 struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
67 int ret;
68
69 dma_resv_lock(gem->resv, NULL);
70 ret = ttm_bo_vmap(bo, map);
71 dma_resv_unlock(gem->resv);
72
73 return ret;
74 }
75 EXPORT_SYMBOL(drm_gem_ttm_vmap);
76
77 /**
78 * drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object
79 * @gem: GEM object.
80 * @map: dma-buf mapping.
81 *
82 * Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as
83 * &drm_gem_object_funcs.vmap callback.
84 */
drm_gem_ttm_vunmap(struct drm_gem_object * gem,struct iosys_map * map)85 void drm_gem_ttm_vunmap(struct drm_gem_object *gem,
86 struct iosys_map *map)
87 {
88 struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
89
90 dma_resv_lock(gem->resv, NULL);
91 ttm_bo_vunmap(bo, map);
92 dma_resv_unlock(gem->resv);
93 }
94 EXPORT_SYMBOL(drm_gem_ttm_vunmap);
95
96 /**
97 * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
98 * @gem: GEM object.
99 * @vma: vm area.
100 *
101 * This function can be used as &drm_gem_object_funcs.mmap
102 * callback.
103 */
drm_gem_ttm_mmap(struct drm_gem_object * gem,struct vm_area_struct * vma)104 int drm_gem_ttm_mmap(struct drm_gem_object *gem,
105 struct vm_area_struct *vma)
106 {
107 struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
108 int ret;
109
110 ret = ttm_bo_mmap_obj(vma, bo);
111 if (ret < 0)
112 return ret;
113
114 /*
115 * ttm has its own object refcounting, so drop gem reference
116 * to avoid double accounting counting.
117 */
118 drm_gem_object_put(gem);
119
120 return 0;
121 }
122 EXPORT_SYMBOL(drm_gem_ttm_mmap);
123
124 /**
125 * drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset
126 * @file: DRM file pointer.
127 * @dev: DRM device.
128 * @handle: GEM handle
129 * @offset: Returns the mapping's memory offset on success
130 *
131 * Provides an implementation of struct &drm_driver.dumb_map_offset for
132 * TTM-based GEM drivers. TTM allocates the offset internally and
133 * drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations.
134 *
135 * See struct &drm_driver.dumb_map_offset.
136 *
137 * Returns:
138 * 0 on success, or a negative errno code otherwise.
139 */
drm_gem_ttm_dumb_map_offset(struct drm_file * file,struct drm_device * dev,uint32_t handle,uint64_t * offset)140 int drm_gem_ttm_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
141 uint32_t handle, uint64_t *offset)
142 {
143 struct drm_gem_object *gem;
144
145 gem = drm_gem_object_lookup(file, handle);
146 if (!gem)
147 return -ENOENT;
148
149 *offset = drm_vma_node_offset_addr(&gem->vma_node);
150
151 drm_gem_object_put(gem);
152
153 return 0;
154 }
155 EXPORT_SYMBOL(drm_gem_ttm_dumb_map_offset);
156
157 MODULE_DESCRIPTION("DRM gem ttm helpers");
158 MODULE_LICENSE("GPL");
159