1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef DRM_GEM_VRAM_HELPER_H
#define DRM_GEM_VRAM_HELPER_H
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_modes.h>
#include <drm/ttm/ttm_bo_api.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <linux/kernel.h> /* for container_of() */
struct drm_mode_create_dumb;
struct drm_plane;
struct drm_plane_state;
struct drm_simple_display_pipe;
struct filp;
struct vm_area_struct;
#define DRM_GEM_VRAM_PL_FLAG_SYSTEM (1 << 0)
#define DRM_GEM_VRAM_PL_FLAG_VRAM (1 << 1)
#define DRM_GEM_VRAM_PL_FLAG_TOPDOWN (1 << 2)
/*
* Buffer-object helpers
*/
/**
* struct drm_gem_vram_object - GEM object backed by VRAM
* @gem: GEM object
* @bo: TTM buffer object
* @kmap: Mapping information for @bo
* @placement: TTM placement information. Supported placements are \
%TTM_PL_VRAM and %TTM_PL_SYSTEM
* @placements: TTM placement information.
*
* The type struct drm_gem_vram_object represents a GEM object that is
* backed by VRAM. It can be used for simple framebuffer devices with
* dedicated memory. The buffer object can be evicted to system memory if
* video memory becomes scarce.
*
* GEM VRAM objects perform reference counting for pin and mapping
* operations. So a buffer object that has been pinned N times with
* drm_gem_vram_pin() must be unpinned N times with
* drm_gem_vram_unpin(). The same applies to pairs of
* drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of
* drm_gem_vram_vmap() and drm_gem_vram_vunmap().
*/
struct drm_gem_vram_object {
struct ttm_buffer_object bo;
struct ttm_bo_kmap_obj kmap;
/**
* @kmap_use_count:
*
* Reference count on the virtual address.
* The address are un-mapped when the count reaches zero.
*/
unsigned int kmap_use_count;
/* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
struct ttm_placement placement;
struct ttm_place placements[2];
};
/**
* Returns the container of type &struct drm_gem_vram_object
* for field bo.
* @bo: the VRAM buffer object
* Returns: The containing GEM VRAM object
*/
static inline struct drm_gem_vram_object *drm_gem_vram_of_bo(
struct ttm_buffer_object *bo)
{
return container_of(bo, struct drm_gem_vram_object, bo);
}
/**
* Returns the container of type &struct drm_gem_vram_object
* for field gem.
* @gem: the GEM object
* Returns: The containing GEM VRAM object
*/
static inline struct drm_gem_vram_object *drm_gem_vram_of_gem(
struct drm_gem_object *gem)
{
return container_of(gem, struct drm_gem_vram_object, bo.base);
}
struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
size_t size,
unsigned long pg_align);
void drm_gem_vram_put(struct drm_gem_vram_object *gbo);
u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo);
void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr);
int drm_gem_vram_fill_create_dumb(struct drm_file *file,
struct drm_device *dev,
unsigned long pg_align,
unsigned long pitch_align,
struct drm_mode_create_dumb *args);
/*
* Helpers for struct drm_driver
*/
int drm_gem_vram_driver_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
struct drm_device *dev,
uint32_t handle, uint64_t *offset);
/*
* Helpers for struct drm_plane_helper_funcs
*/
int
drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *new_state);
void
drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state);
/*
* Helpers for struct drm_simple_display_pipe_funcs
*/
int drm_gem_vram_simple_display_pipe_prepare_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *new_state);
void drm_gem_vram_simple_display_pipe_cleanup_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state);
/**
* define DRM_GEM_VRAM_DRIVER - default callback functions for \
&struct drm_driver
*
* Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
* &struct drm_driver with default functions.
*/
#define DRM_GEM_VRAM_DRIVER \
.debugfs_init = drm_vram_mm_debugfs_init, \
.dumb_create = drm_gem_vram_driver_dumb_create, \
.dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \
.gem_prime_mmap = drm_gem_prime_mmap
/*
* VRAM memory manager
*/
/**
* struct drm_vram_mm - An instance of VRAM MM
* @vram_base: Base address of the managed video memory
* @vram_size: Size of the managed video memory in bytes
* @bdev: The TTM BO device.
* @funcs: TTM BO functions
*
* The fields &struct drm_vram_mm.vram_base and
* &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
* available for public read access. Use the field
* &struct drm_vram_mm.bdev to access the TTM BO device.
*/
struct drm_vram_mm {
uint64_t vram_base;
size_t vram_size;
struct ttm_bo_device bdev;
};
/**
* drm_vram_mm_of_bdev() - \
Returns the container of type &struct ttm_bo_device for field bdev.
* @bdev: the TTM BO device
*
* Returns:
* The containing instance of &struct drm_vram_mm
*/
static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
struct ttm_bo_device *bdev)
{
return container_of(bdev, struct drm_vram_mm, bdev);
}
void drm_vram_mm_debugfs_init(struct drm_minor *minor);
/*
* Helpers for integration with struct drm_device
*/
struct drm_vram_mm *drm_vram_helper_alloc_mm(
struct drm_device *dev, uint64_t vram_base, size_t vram_size);
void drm_vram_helper_release_mm(struct drm_device *dev);
int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base,
size_t vram_size);
/*
* Mode-config helpers
*/
enum drm_mode_status
drm_vram_helper_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode);
#endif
|
