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> 28 #include <drm/drm_mode_object.h> 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 calling 44 * &drm_mode_config_funcs.fb_create. 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 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_get() and 105 * drm_framebuffer_put(). 106 * 107 * The refcount is stored inside the mode object @base. 108 */ 109 struct drm_framebuffer { 110 /** 111 * @dev: DRM device this framebuffer belongs to 112 */ 113 struct drm_device *dev; 114 /** 115 * @head: Place on the &drm_mode_config.fb_list, access protected by 116 * &drm_mode_config.fb_lock. 117 */ 118 struct list_head head; 119 120 /** 121 * @base: base modeset object structure, contains the reference count. 122 */ 123 struct drm_mode_object base; 124 125 /** 126 * @comm: Name of the process allocating the fb, used for fb dumping. 127 */ 128 char comm[TASK_COMM_LEN]; 129 130 /** 131 * @format: framebuffer format information 132 */ 133 const struct drm_format_info *format; 134 /** 135 * @funcs: framebuffer vfunc table 136 */ 137 const struct drm_framebuffer_funcs *funcs; 138 /** 139 * @pitches: Line stride per buffer. For userspace created object this 140 * is copied from drm_mode_fb_cmd2. 141 */ 142 unsigned int pitches[4]; 143 /** 144 * @offsets: Offset from buffer start to the actual pixel data in bytes, 145 * per buffer. For userspace created object this is copied from 146 * drm_mode_fb_cmd2. 147 * 148 * Note that this is a linear offset and does not take into account 149 * tiling or buffer laytou per @modifier. It meant to be used when the 150 * actual pixel data for this framebuffer plane starts at an offset, 151 * e.g. when multiple planes are allocated within the same backing 152 * storage buffer object. For tiled layouts this generally means it 153 * @offsets must at least be tile-size aligned, but hardware often has 154 * stricter requirements. 155 * 156 * This should not be used to specifiy x/y pixel offsets into the buffer 157 * data (even for linear buffers). Specifying an x/y pixel offset is 158 * instead done through the source rectangle in &struct drm_plane_state. 159 */ 160 unsigned int offsets[4]; 161 /** 162 * @modifier: Data layout modifier. This is used to describe 163 * tiling, or also special layouts (like compression) of auxiliary 164 * buffers. For userspace created object this is copied from 165 * drm_mode_fb_cmd2. 166 */ 167 uint64_t modifier; 168 /** 169 * @width: Logical width of the visible area of the framebuffer, in 170 * pixels. 171 */ 172 unsigned int width; 173 /** 174 * @height: Logical height of the visible area of the framebuffer, in 175 * pixels. 176 */ 177 unsigned int height; 178 /** 179 * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or 180 * DRM_MODE_FB_MODIFIERS. 181 */ 182 int flags; 183 /** 184 * @hot_x: X 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 */ 188 int hot_x; 189 /** 190 * @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor 191 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR 192 * universal plane. 193 */ 194 int hot_y; 195 /** 196 * @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock. 197 */ 198 struct list_head filp_head; 199 /** 200 * @obj: GEM objects backing the framebuffer, one per plane (optional). 201 * 202 * This is used by the GEM framebuffer helpers, see e.g. 203 * drm_gem_fb_create(). 204 */ 205 struct drm_gem_object *obj[4]; 206 }; 207 208 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base) 209 210 int drm_framebuffer_init(struct drm_device *dev, 211 struct drm_framebuffer *fb, 212 const struct drm_framebuffer_funcs *funcs); 213 struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, 214 struct drm_file *file_priv, 215 uint32_t id); 216 void drm_framebuffer_remove(struct drm_framebuffer *fb); 217 void drm_framebuffer_cleanup(struct drm_framebuffer *fb); 218 void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); 219 220 /** 221 * drm_framebuffer_get - acquire a framebuffer reference 222 * @fb: DRM framebuffer 223 * 224 * This function increments the framebuffer's reference count. 225 */ 226 static inline void drm_framebuffer_get(struct drm_framebuffer *fb) 227 { 228 drm_mode_object_get(&fb->base); 229 } 230 231 /** 232 * drm_framebuffer_put - release a framebuffer reference 233 * @fb: DRM framebuffer 234 * 235 * This function decrements the framebuffer's reference count and frees the 236 * framebuffer if the reference count drops to zero. 237 */ 238 static inline void drm_framebuffer_put(struct drm_framebuffer *fb) 239 { 240 drm_mode_object_put(&fb->base); 241 } 242 243 /** 244 * drm_framebuffer_reference - acquire a framebuffer reference 245 * @fb: DRM framebuffer 246 * 247 * This is a compatibility alias for drm_framebuffer_get() and should not be 248 * used by new code. 249 */ 250 static inline void drm_framebuffer_reference(struct drm_framebuffer *fb) 251 { 252 drm_framebuffer_get(fb); 253 } 254 255 /** 256 * drm_framebuffer_unreference - release a framebuffer reference 257 * @fb: DRM framebuffer 258 * 259 * This is a compatibility alias for drm_framebuffer_put() and should not be 260 * used by new code. 261 */ 262 static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb) 263 { 264 drm_framebuffer_put(fb); 265 } 266 267 /** 268 * drm_framebuffer_read_refcount - read the framebuffer reference count. 269 * @fb: framebuffer 270 * 271 * This functions returns the framebuffer's reference count. 272 */ 273 static inline uint32_t drm_framebuffer_read_refcount(const struct drm_framebuffer *fb) 274 { 275 return kref_read(&fb->base.refcount); 276 } 277 278 /** 279 * drm_framebuffer_assign - store a reference to the fb 280 * @p: location to store framebuffer 281 * @fb: new framebuffer (maybe NULL) 282 * 283 * This functions sets the location to store a reference to the framebuffer, 284 * unreferencing the framebuffer that was previously stored in that location. 285 */ 286 static inline void drm_framebuffer_assign(struct drm_framebuffer **p, 287 struct drm_framebuffer *fb) 288 { 289 if (fb) 290 drm_framebuffer_get(fb); 291 if (*p) 292 drm_framebuffer_put(*p); 293 *p = fb; 294 } 295 296 /* 297 * drm_for_each_fb - iterate over all framebuffers 298 * @fb: the loop cursor 299 * @dev: the DRM device 300 * 301 * Iterate over all framebuffers of @dev. User must hold 302 * &drm_mode_config.fb_lock. 303 */ 304 #define drm_for_each_fb(fb, dev) \ 305 for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ 306 fb = list_first_entry(&(dev)->mode_config.fb_list, \ 307 struct drm_framebuffer, head); \ 308 &fb->head != (&(dev)->mode_config.fb_list); \ 309 fb = list_next_entry(fb, head)) 310 311 int drm_framebuffer_plane_width(int width, 312 const struct drm_framebuffer *fb, int plane); 313 int drm_framebuffer_plane_height(int height, 314 const struct drm_framebuffer *fb, int plane); 315 316 #endif 317