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7520a277 DV |
1 | /* |
2 | * Copyright (c) 2016 Intel Corporation | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
23 | #ifndef __DRM_FRAMEBUFFER_H__ | |
24 | #define __DRM_FRAMEBUFFER_H__ | |
25 | ||
26 | #include <linux/list.h> | |
27 | #include <linux/ctype.h> | |
949619f3 | 28 | #include <drm/drm_mode_object.h> |
7520a277 DV |
29 | |
30 | struct drm_framebuffer; | |
31 | struct drm_file; | |
32 | struct drm_device; | |
33 | ||
34 | /** | |
35 | * struct drm_framebuffer_funcs - framebuffer hooks | |
36 | */ | |
37 | struct drm_framebuffer_funcs { | |
38 | /** | |
39 | * @destroy: | |
40 | * | |
41 | * Clean up framebuffer resources, specifically also unreference the | |
42 | * backing storage. The core guarantees to call this function for every | |
43 | * framebuffer successfully created by ->fb_create() in | |
44 | * &drm_mode_config_funcs. Drivers must also call | |
45 | * drm_framebuffer_cleanup() to release DRM core resources for this | |
46 | * framebuffer. | |
47 | */ | |
48 | void (*destroy)(struct drm_framebuffer *framebuffer); | |
49 | ||
50 | /** | |
51 | * @create_handle: | |
52 | * | |
53 | * Create a buffer handle in the driver-specific buffer manager (either | |
54 | * GEM or TTM) valid for the passed-in struct &drm_file. This is used by | |
55 | * the core to implement the GETFB IOCTL, which returns (for | |
56 | * sufficiently priviledged user) also a native buffer handle. This can | |
57 | * be used for seamless transitions between modesetting clients by | |
58 | * copying the current screen contents to a private buffer and blending | |
59 | * between that and the new contents. | |
60 | * | |
61 | * GEM based drivers should call drm_gem_handle_create() to create the | |
62 | * handle. | |
63 | * | |
64 | * RETURNS: | |
65 | * | |
66 | * 0 on success or a negative error code on failure. | |
67 | */ | |
68 | int (*create_handle)(struct drm_framebuffer *fb, | |
69 | struct drm_file *file_priv, | |
70 | unsigned int *handle); | |
71 | /** | |
72 | * @dirty: | |
73 | * | |
74 | * Optional callback for the dirty fb IOCTL. | |
75 | * | |
76 | * Userspace can notify the driver via this callback that an area of the | |
77 | * framebuffer has changed and should be flushed to the display | |
78 | * hardware. This can also be used internally, e.g. by the fbdev | |
79 | * emulation, though that's not the case currently. | |
80 | * | |
81 | * See documentation in drm_mode.h for the struct drm_mode_fb_dirty_cmd | |
82 | * for more information as all the semantics and arguments have a one to | |
83 | * one mapping on this function. | |
84 | * | |
85 | * RETURNS: | |
86 | * | |
87 | * 0 on success or a negative error code on failure. | |
88 | */ | |
89 | int (*dirty)(struct drm_framebuffer *framebuffer, | |
90 | struct drm_file *file_priv, unsigned flags, | |
91 | unsigned color, struct drm_clip_rect *clips, | |
92 | unsigned num_clips); | |
93 | }; | |
94 | ||
750fb8c4 DV |
95 | /** |
96 | * struct drm_framebuffer - frame buffer object | |
97 | * | |
98 | * Note that the fb is refcounted for the benefit of driver internals, | |
99 | * for example some hw, disabling a CRTC/plane is asynchronous, and | |
100 | * scanout does not actually complete until the next vblank. So some | |
101 | * cleanup (like releasing the reference(s) on the backing GEM bo(s)) | |
102 | * should be deferred. In cases like this, the driver would like to | |
103 | * hold a ref to the fb even though it has already been removed from | |
104 | * userspace perspective. See drm_framebuffer_reference() and | |
105 | * drm_framebuffer_unreference(). | |
106 | * | |
107 | * The refcount is stored inside the mode object @base. | |
108 | */ | |
7520a277 | 109 | struct drm_framebuffer { |
750fb8c4 DV |
110 | /** |
111 | * @dev: DRM device this framebuffer belongs to | |
112 | */ | |
7520a277 | 113 | struct drm_device *dev; |
750fb8c4 DV |
114 | /** |
115 | * @head: Place on the dev->mode_config.fb_list, access protected by | |
7520a277 DV |
116 | * dev->mode_config.fb_lock. |
117 | */ | |
118 | struct list_head head; | |
750fb8c4 DV |
119 | |
120 | /** | |
121 | * @base: base modeset object structure, contains the reference count. | |
122 | */ | |
7520a277 | 123 | struct drm_mode_object base; |
e14c23c6 VS |
124 | /** |
125 | * @format: framebuffer format information | |
126 | */ | |
127 | const struct drm_format_info *format; | |
750fb8c4 DV |
128 | /** |
129 | * @funcs: framebuffer vfunc table | |
130 | */ | |
7520a277 | 131 | const struct drm_framebuffer_funcs *funcs; |
750fb8c4 DV |
132 | /** |
133 | * @pitches: Line stride per buffer. For userspace created object this | |
134 | * is copied from drm_mode_fb_cmd2. | |
135 | */ | |
7520a277 | 136 | unsigned int pitches[4]; |
750fb8c4 DV |
137 | /** |
138 | * @offsets: Offset from buffer start to the actual pixel data in bytes, | |
139 | * per buffer. For userspace created object this is copied from | |
140 | * drm_mode_fb_cmd2. | |
141 | * | |
142 | * Note that this is a linear offset and does not take into account | |
143 | * tiling or buffer laytou per @modifier. It meant to be used when the | |
144 | * actual pixel data for this framebuffer plane starts at an offset, | |
145 | * e.g. when multiple planes are allocated within the same backing | |
146 | * storage buffer object. For tiled layouts this generally means it | |
147 | * @offsets must at least be tile-size aligned, but hardware often has | |
148 | * stricter requirements. | |
149 | * | |
150 | * This should not be used to specifiy x/y pixel offsets into the buffer | |
151 | * data (even for linear buffers). Specifying an x/y pixel offset is | |
152 | * instead done through the source rectangle in struct &drm_plane_state. | |
153 | */ | |
7520a277 | 154 | unsigned int offsets[4]; |
750fb8c4 | 155 | /** |
bae781b2 | 156 | * @modifier: Data layout modifier. This is used to describe |
750fb8c4 DV |
157 | * tiling, or also special layouts (like compression) of auxiliary |
158 | * buffers. For userspace created object this is copied from | |
159 | * drm_mode_fb_cmd2. | |
160 | */ | |
bae781b2 | 161 | uint64_t modifier; |
750fb8c4 DV |
162 | /** |
163 | * @width: Logical width of the visible area of the framebuffer, in | |
164 | * pixels. | |
165 | */ | |
7520a277 | 166 | unsigned int width; |
750fb8c4 DV |
167 | /** |
168 | * @height: Logical height of the visible area of the framebuffer, in | |
169 | * pixels. | |
170 | */ | |
7520a277 | 171 | unsigned int height; |
750fb8c4 DV |
172 | /** |
173 | * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or | |
174 | * DRM_MODE_FB_MODIFIERS. | |
175 | */ | |
7520a277 | 176 | int flags; |
750fb8c4 DV |
177 | /** |
178 | * @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor | |
179 | * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR | |
180 | * universal plane. | |
181 | */ | |
7520a277 | 182 | int hot_x; |
750fb8c4 DV |
183 | /** |
184 | * @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor | |
185 | * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR | |
186 | * universal plane. | |
187 | */ | |
7520a277 | 188 | int hot_y; |
750fb8c4 DV |
189 | /** |
190 | * @filp_head: Placed on struct &drm_file fbs list_head, protected by | |
191 | * fbs_lock in the same structure. | |
192 | */ | |
7520a277 DV |
193 | struct list_head filp_head; |
194 | }; | |
195 | ||
afb21ea6 DV |
196 | #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base) |
197 | ||
7520a277 DV |
198 | int drm_framebuffer_init(struct drm_device *dev, |
199 | struct drm_framebuffer *fb, | |
200 | const struct drm_framebuffer_funcs *funcs); | |
201 | struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, | |
202 | uint32_t id); | |
203 | void drm_framebuffer_remove(struct drm_framebuffer *fb); | |
204 | void drm_framebuffer_cleanup(struct drm_framebuffer *fb); | |
205 | void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); | |
206 | ||
207 | /** | |
208 | * drm_framebuffer_reference - incr the fb refcnt | |
209 | * @fb: framebuffer | |
210 | * | |
211 | * This functions increments the fb's refcount. | |
212 | */ | |
213 | static inline void drm_framebuffer_reference(struct drm_framebuffer *fb) | |
214 | { | |
215 | drm_mode_object_reference(&fb->base); | |
216 | } | |
217 | ||
218 | /** | |
219 | * drm_framebuffer_unreference - unref a framebuffer | |
220 | * @fb: framebuffer to unref | |
221 | * | |
222 | * This functions decrements the fb's refcount and frees it if it drops to zero. | |
223 | */ | |
224 | static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb) | |
225 | { | |
226 | drm_mode_object_unreference(&fb->base); | |
227 | } | |
228 | ||
229 | /** | |
230 | * drm_framebuffer_read_refcount - read the framebuffer reference count. | |
231 | * @fb: framebuffer | |
232 | * | |
233 | * This functions returns the framebuffer's reference count. | |
234 | */ | |
235 | static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb) | |
236 | { | |
237 | return atomic_read(&fb->base.refcount.refcount); | |
238 | } | |
afb21ea6 DV |
239 | |
240 | /** | |
389f78b3 CW |
241 | * drm_framebuffer_assign - store a reference to the fb |
242 | * @p: location to store framebuffer | |
243 | * @fb: new framebuffer (maybe NULL) | |
244 | * | |
245 | * This functions sets the location to store a reference to the framebuffer, | |
246 | * unreferencing the framebuffer that was previously stored in that location. | |
247 | */ | |
248 | static inline void drm_framebuffer_assign(struct drm_framebuffer **p, | |
249 | struct drm_framebuffer *fb) | |
250 | { | |
251 | if (fb) | |
252 | drm_framebuffer_reference(fb); | |
253 | if (*p) | |
254 | drm_framebuffer_unreference(*p); | |
255 | *p = fb; | |
256 | } | |
257 | ||
258 | /* | |
afb21ea6 DV |
259 | * drm_for_each_fb - iterate over all framebuffers |
260 | * @fb: the loop cursor | |
261 | * @dev: the DRM device | |
262 | * | |
263 | * Iterate over all framebuffers of @dev. User must hold the fb_lock from | |
264 | * &drm_mode_config. | |
265 | */ | |
266 | #define drm_for_each_fb(fb, dev) \ | |
267 | for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ | |
268 | fb = list_first_entry(&(dev)->mode_config.fb_list, \ | |
269 | struct drm_framebuffer, head); \ | |
270 | &fb->head != (&(dev)->mode_config.fb_list); \ | |
271 | fb = list_next_entry(fb, head)) | |
8f8f6a6c VS |
272 | |
273 | int drm_framebuffer_plane_width(int width, | |
274 | const struct drm_framebuffer *fb, int plane); | |
275 | int drm_framebuffer_plane_height(int height, | |
276 | const struct drm_framebuffer *fb, int plane); | |
277 | ||
7520a277 | 278 | #endif |