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/ctype.h> |
27 | #include <linux/list.h> |
28 | #include <linux/sched.h> |
29 | |
30 | #include <drm/drm_fourcc.h> |
31 | #include <drm/drm_mode_object.h> |
32 | |
33 | struct drm_clip_rect; |
34 | struct drm_device; |
35 | struct drm_file; |
36 | struct drm_framebuffer; |
37 | struct drm_gem_object; |
38 | |
39 | /** |
40 | * struct drm_framebuffer_funcs - framebuffer hooks |
41 | */ |
42 | struct drm_framebuffer_funcs { |
43 | /** |
44 | * @destroy: |
45 | * |
46 | * Clean up framebuffer resources, specifically also unreference the |
47 | * backing storage. The core guarantees to call this function for every |
48 | * framebuffer successfully created by calling |
49 | * &drm_mode_config_funcs.fb_create. Drivers must also call |
50 | * drm_framebuffer_cleanup() to release DRM core resources for this |
51 | * framebuffer. |
52 | */ |
53 | void (*destroy)(struct drm_framebuffer *framebuffer); |
54 | |
55 | /** |
56 | * @create_handle: |
57 | * |
58 | * Create a buffer handle in the driver-specific buffer manager (either |
59 | * GEM or TTM) valid for the passed-in &struct drm_file. This is used by |
60 | * the core to implement the GETFB IOCTL, which returns (for |
61 | * sufficiently priviledged user) also a native buffer handle. This can |
62 | * be used for seamless transitions between modesetting clients by |
63 | * copying the current screen contents to a private buffer and blending |
64 | * between that and the new contents. |
65 | * |
66 | * GEM based drivers should call drm_gem_handle_create() to create the |
67 | * handle. |
68 | * |
69 | * RETURNS: |
70 | * |
71 | * 0 on success or a negative error code on failure. |
72 | */ |
73 | int (*create_handle)(struct drm_framebuffer *fb, |
74 | struct drm_file *file_priv, |
75 | unsigned int *handle); |
76 | /** |
77 | * @dirty: |
78 | * |
79 | * Optional callback for the dirty fb IOCTL. |
80 | * |
81 | * Userspace can notify the driver via this callback that an area of the |
82 | * framebuffer has changed and should be flushed to the display |
83 | * hardware. This can also be used internally, e.g. by the fbdev |
84 | * emulation, though that's not the case currently. |
85 | * |
86 | * See documentation in drm_mode.h for the struct drm_mode_fb_dirty_cmd |
87 | * for more information as all the semantics and arguments have a one to |
88 | * one mapping on this function. |
89 | * |
90 | * Atomic drivers should use drm_atomic_helper_dirtyfb() to implement |
91 | * this hook. |
92 | * |
93 | * RETURNS: |
94 | * |
95 | * 0 on success or a negative error code on failure. |
96 | */ |
97 | int (*dirty)(struct drm_framebuffer *framebuffer, |
98 | struct drm_file *file_priv, unsigned flags, |
99 | unsigned color, struct drm_clip_rect *clips, |
100 | unsigned num_clips); |
101 | }; |
102 | |
103 | /** |
104 | * struct drm_framebuffer - frame buffer object |
105 | * |
106 | * Note that the fb is refcounted for the benefit of driver internals, |
107 | * for example some hw, disabling a CRTC/plane is asynchronous, and |
108 | * scanout does not actually complete until the next vblank. So some |
109 | * cleanup (like releasing the reference(s) on the backing GEM bo(s)) |
110 | * should be deferred. In cases like this, the driver would like to |
111 | * hold a ref to the fb even though it has already been removed from |
112 | * userspace perspective. See drm_framebuffer_get() and |
113 | * drm_framebuffer_put(). |
114 | * |
115 | * The refcount is stored inside the mode object @base. |
116 | */ |
117 | struct drm_framebuffer { |
118 | /** |
119 | * @dev: DRM device this framebuffer belongs to |
120 | */ |
121 | struct drm_device *dev; |
122 | /** |
123 | * @head: Place on the &drm_mode_config.fb_list, access protected by |
124 | * &drm_mode_config.fb_lock. |
125 | */ |
126 | struct list_head head; |
127 | |
128 | /** |
129 | * @base: base modeset object structure, contains the reference count. |
130 | */ |
131 | struct drm_mode_object base; |
132 | |
133 | /** |
134 | * @comm: Name of the process allocating the fb, used for fb dumping. |
135 | */ |
136 | char comm[TASK_COMM_LEN]; |
137 | |
138 | /** |
139 | * @format: framebuffer format information |
140 | */ |
141 | const struct drm_format_info *format; |
142 | /** |
143 | * @funcs: framebuffer vfunc table |
144 | */ |
145 | const struct drm_framebuffer_funcs *funcs; |
146 | /** |
147 | * @pitches: Line stride per buffer. For userspace created object this |
148 | * is copied from drm_mode_fb_cmd2. |
149 | */ |
150 | unsigned int pitches[DRM_FORMAT_MAX_PLANES]; |
151 | /** |
152 | * @offsets: Offset from buffer start to the actual pixel data in bytes, |
153 | * per buffer. For userspace created object this is copied from |
154 | * drm_mode_fb_cmd2. |
155 | * |
156 | * Note that this is a linear offset and does not take into account |
157 | * tiling or buffer layout per @modifier. It is meant to be used when |
158 | * the actual pixel data for this framebuffer plane starts at an offset, |
159 | * e.g. when multiple planes are allocated within the same backing |
160 | * storage buffer object. For tiled layouts this generally means its |
161 | * @offsets must at least be tile-size aligned, but hardware often has |
162 | * stricter requirements. |
163 | * |
164 | * This should not be used to specifiy x/y pixel offsets into the buffer |
165 | * data (even for linear buffers). Specifying an x/y pixel offset is |
166 | * instead done through the source rectangle in &struct drm_plane_state. |
167 | */ |
168 | unsigned int offsets[DRM_FORMAT_MAX_PLANES]; |
169 | /** |
170 | * @modifier: Data layout modifier. This is used to describe |
171 | * tiling, or also special layouts (like compression) of auxiliary |
172 | * buffers. For userspace created object this is copied from |
173 | * drm_mode_fb_cmd2. |
174 | */ |
175 | uint64_t modifier; |
176 | /** |
177 | * @width: Logical width of the visible area of the framebuffer, in |
178 | * pixels. |
179 | */ |
180 | unsigned int width; |
181 | /** |
182 | * @height: Logical height of the visible area of the framebuffer, in |
183 | * pixels. |
184 | */ |
185 | unsigned int height; |
186 | /** |
187 | * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or |
188 | * DRM_MODE_FB_MODIFIERS. |
189 | */ |
190 | int flags; |
191 | /** |
192 | * @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock. |
193 | */ |
194 | struct list_head filp_head; |
195 | /** |
196 | * @obj: GEM objects backing the framebuffer, one per plane (optional). |
197 | * |
198 | * This is used by the GEM framebuffer helpers, see e.g. |
199 | * drm_gem_fb_create(). |
200 | */ |
201 | struct drm_gem_object *obj[DRM_FORMAT_MAX_PLANES]; |
202 | }; |
203 | |
204 | #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base) |
205 | |
206 | int drm_framebuffer_init(struct drm_device *dev, |
207 | struct drm_framebuffer *fb, |
208 | const struct drm_framebuffer_funcs *funcs); |
209 | struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, |
210 | struct drm_file *file_priv, |
211 | uint32_t id); |
212 | void drm_framebuffer_remove(struct drm_framebuffer *fb); |
213 | void drm_framebuffer_cleanup(struct drm_framebuffer *fb); |
214 | void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); |
215 | |
216 | /** |
217 | * drm_framebuffer_get - acquire a framebuffer reference |
218 | * @fb: DRM framebuffer |
219 | * |
220 | * This function increments the framebuffer's reference count. |
221 | */ |
222 | static inline void drm_framebuffer_get(struct drm_framebuffer *fb) |
223 | { |
224 | drm_mode_object_get(obj: &fb->base); |
225 | } |
226 | |
227 | /** |
228 | * drm_framebuffer_put - release a framebuffer reference |
229 | * @fb: DRM framebuffer |
230 | * |
231 | * This function decrements the framebuffer's reference count and frees the |
232 | * framebuffer if the reference count drops to zero. |
233 | */ |
234 | static inline void drm_framebuffer_put(struct drm_framebuffer *fb) |
235 | { |
236 | drm_mode_object_put(obj: &fb->base); |
237 | } |
238 | |
239 | /** |
240 | * drm_framebuffer_read_refcount - read the framebuffer reference count. |
241 | * @fb: framebuffer |
242 | * |
243 | * This functions returns the framebuffer's reference count. |
244 | */ |
245 | static inline uint32_t drm_framebuffer_read_refcount(const struct drm_framebuffer *fb) |
246 | { |
247 | return kref_read(kref: &fb->base.refcount); |
248 | } |
249 | |
250 | /** |
251 | * drm_framebuffer_assign - store a reference to the fb |
252 | * @p: location to store framebuffer |
253 | * @fb: new framebuffer (maybe NULL) |
254 | * |
255 | * This functions sets the location to store a reference to the framebuffer, |
256 | * unreferencing the framebuffer that was previously stored in that location. |
257 | */ |
258 | static inline void drm_framebuffer_assign(struct drm_framebuffer **p, |
259 | struct drm_framebuffer *fb) |
260 | { |
261 | if (fb) |
262 | drm_framebuffer_get(fb); |
263 | if (*p) |
264 | drm_framebuffer_put(fb: *p); |
265 | *p = fb; |
266 | } |
267 | |
268 | /* |
269 | * drm_for_each_fb - iterate over all framebuffers |
270 | * @fb: the loop cursor |
271 | * @dev: the DRM device |
272 | * |
273 | * Iterate over all framebuffers of @dev. User must hold |
274 | * &drm_mode_config.fb_lock. |
275 | */ |
276 | #define drm_for_each_fb(fb, dev) \ |
277 | for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ |
278 | fb = list_first_entry(&(dev)->mode_config.fb_list, \ |
279 | struct drm_framebuffer, head); \ |
280 | &fb->head != (&(dev)->mode_config.fb_list); \ |
281 | fb = list_next_entry(fb, head)) |
282 | |
283 | /** |
284 | * struct drm_afbc_framebuffer - a special afbc frame buffer object |
285 | * |
286 | * A derived class of struct drm_framebuffer, dedicated for afbc use cases. |
287 | */ |
288 | struct drm_afbc_framebuffer { |
289 | /** |
290 | * @base: base framebuffer structure. |
291 | */ |
292 | struct drm_framebuffer base; |
293 | /** |
294 | * @block_width: width of a single afbc block |
295 | */ |
296 | u32 block_width; |
297 | /** |
298 | * @block_height: height of a single afbc block |
299 | */ |
300 | u32 block_height; |
301 | /** |
302 | * @aligned_width: aligned frame buffer width |
303 | */ |
304 | u32 aligned_width; |
305 | /** |
306 | * @aligned_height: aligned frame buffer height |
307 | */ |
308 | u32 aligned_height; |
309 | /** |
310 | * @offset: offset of the first afbc header |
311 | */ |
312 | u32 offset; |
313 | /** |
314 | * @afbc_size: minimum size of afbc buffer |
315 | */ |
316 | u32 afbc_size; |
317 | }; |
318 | |
319 | #define fb_to_afbc_fb(x) container_of(x, struct drm_afbc_framebuffer, base) |
320 | |
321 | #endif |
322 | |