Merge tag 'for-linus-6.3-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-rpi.git] / drivers / gpu / drm / drm_gem_ttm_helper.c
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 #include <drm/ttm/ttm_placement.h>
7 #include <drm/ttm/ttm_tt.h>
8
9 /**
10  * DOC: overview
11  *
12  * This library provides helper functions for gem objects backed by
13  * ttm.
14  */
15
16 /**
17  * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
18  * @p: DRM printer
19  * @indent: Tab indentation level
20  * @gem: GEM object
21  *
22  * This function can be used as &drm_gem_object_funcs.print_info
23  * callback.
24  */
25 void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
26                             const struct drm_gem_object *gem)
27 {
28         static const char * const plname[] = {
29                 [ TTM_PL_SYSTEM ] = "system",
30                 [ TTM_PL_TT     ] = "tt",
31                 [ TTM_PL_VRAM   ] = "vram",
32                 [ TTM_PL_PRIV   ] = "priv",
33
34                 [ 16 ]            = "cached",
35                 [ 17 ]            = "uncached",
36                 [ 18 ]            = "wc",
37                 [ 19 ]            = "contig",
38
39                 [ 21 ]            = "pinned", /* NO_EVICT */
40                 [ 22 ]            = "topdown",
41         };
42         const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
43
44         drm_printf_indent(p, indent, "placement=");
45         drm_print_bits(p, bo->resource->placement, plname, ARRAY_SIZE(plname));
46         drm_printf(p, "\n");
47
48         if (bo->resource->bus.is_iomem)
49                 drm_printf_indent(p, indent, "bus.offset=%lx\n",
50                                   (unsigned long)bo->resource->bus.offset);
51 }
52 EXPORT_SYMBOL(drm_gem_ttm_print_info);
53
54 /**
55  * drm_gem_ttm_vmap() - vmap &ttm_buffer_object
56  * @gem: GEM object.
57  * @map: [out] returns the dma-buf mapping.
58  *
59  * Maps a GEM object with ttm_bo_vmap(). This function can be used as
60  * &drm_gem_object_funcs.vmap callback.
61  *
62  * Returns:
63  * 0 on success, or a negative errno code otherwise.
64  */
65 int drm_gem_ttm_vmap(struct drm_gem_object *gem,
66                      struct iosys_map *map)
67 {
68         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
69
70         return ttm_bo_vmap(bo, map);
71 }
72 EXPORT_SYMBOL(drm_gem_ttm_vmap);
73
74 /**
75  * drm_gem_ttm_vunmap() - vunmap &ttm_buffer_object
76  * @gem: GEM object.
77  * @map: dma-buf mapping.
78  *
79  * Unmaps a GEM object with ttm_bo_vunmap(). This function can be used as
80  * &drm_gem_object_funcs.vmap callback.
81  */
82 void drm_gem_ttm_vunmap(struct drm_gem_object *gem,
83                         struct iosys_map *map)
84 {
85         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
86
87         ttm_bo_vunmap(bo, map);
88 }
89 EXPORT_SYMBOL(drm_gem_ttm_vunmap);
90
91 /**
92  * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
93  * @gem: GEM object.
94  * @vma: vm area.
95  *
96  * This function can be used as &drm_gem_object_funcs.mmap
97  * callback.
98  */
99 int drm_gem_ttm_mmap(struct drm_gem_object *gem,
100                      struct vm_area_struct *vma)
101 {
102         struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
103         int ret;
104
105         ret = ttm_bo_mmap_obj(vma, bo);
106         if (ret < 0)
107                 return ret;
108
109         /*
110          * ttm has its own object refcounting, so drop gem reference
111          * to avoid double accounting counting.
112          */
113         drm_gem_object_put(gem);
114
115         return 0;
116 }
117 EXPORT_SYMBOL(drm_gem_ttm_mmap);
118
119 /**
120  * drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset
121  * @file:       DRM file pointer.
122  * @dev:        DRM device.
123  * @handle:     GEM handle
124  * @offset:     Returns the mapping's memory offset on success
125  *
126  * Provides an implementation of struct &drm_driver.dumb_map_offset for
127  * TTM-based GEM drivers. TTM allocates the offset internally and
128  * drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations.
129  *
130  * See struct &drm_driver.dumb_map_offset.
131  *
132  * Returns:
133  * 0 on success, or a negative errno code otherwise.
134  */
135 int drm_gem_ttm_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
136                                 uint32_t handle, uint64_t *offset)
137 {
138         struct drm_gem_object *gem;
139
140         gem = drm_gem_object_lookup(file, handle);
141         if (!gem)
142                 return -ENOENT;
143
144         *offset = drm_vma_node_offset_addr(&gem->vma_node);
145
146         drm_gem_object_put(gem);
147
148         return 0;
149 }
150 EXPORT_SYMBOL(drm_gem_ttm_dumb_map_offset);
151
152 MODULE_DESCRIPTION("DRM gem ttm helpers");
153 MODULE_LICENSE("GPL");