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_mode_object.h> 31 32 struct drm_clip_rect; 33 struct drm_device; 34 struct drm_file; 35 struct drm_format_info; 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[4]; 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 laytou per @modifier. It meant to be used when the 158 * 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 it 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[4]; 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 * @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor 193 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR 194 * universal plane. 195 */ 196 int hot_x; 197 /** 198 * @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor 199 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR 200 * universal plane. 201 */ 202 int hot_y; 203 /** 204 * @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock. 205 */ 206 struct list_head filp_head; 207 /** 208 * @obj: GEM objects backing the framebuffer, one per plane (optional). 209 * 210 * This is used by the GEM framebuffer helpers, see e.g. 211 * drm_gem_fb_create(). 212 */ 213 struct drm_gem_object *obj[4]; 214 }; 215 216 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base) 217 218 int drm_framebuffer_init(struct drm_device *dev, 219 struct drm_framebuffer *fb, 220 const struct drm_framebuffer_funcs *funcs); 221 struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, 222 struct drm_file *file_priv, 223 uint32_t id); 224 void drm_framebuffer_remove(struct drm_framebuffer *fb); 225 void drm_framebuffer_cleanup(struct drm_framebuffer *fb); 226 void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); 227 228 /** 229 * drm_framebuffer_get - acquire a framebuffer reference 230 * @fb: DRM framebuffer 231 * 232 * This function increments the framebuffer's reference count. 233 */ 234 static inline void drm_framebuffer_get(struct drm_framebuffer *fb) 235 { 236 drm_mode_object_get(&fb->base); 237 } 238 239 /** 240 * drm_framebuffer_put - release a framebuffer reference 241 * @fb: DRM framebuffer 242 * 243 * This function decrements the framebuffer's reference count and frees the 244 * framebuffer if the reference count drops to zero. 245 */ 246 static inline void drm_framebuffer_put(struct drm_framebuffer *fb) 247 { 248 drm_mode_object_put(&fb->base); 249 } 250 251 /** 252 * drm_framebuffer_read_refcount - read the framebuffer reference count. 253 * @fb: framebuffer 254 * 255 * This functions returns the framebuffer's reference count. 256 */ 257 static inline uint32_t drm_framebuffer_read_refcount(const struct drm_framebuffer *fb) 258 { 259 return kref_read(&fb->base.refcount); 260 } 261 262 /** 263 * drm_framebuffer_assign - store a reference to the fb 264 * @p: location to store framebuffer 265 * @fb: new framebuffer (maybe NULL) 266 * 267 * This functions sets the location to store a reference to the framebuffer, 268 * unreferencing the framebuffer that was previously stored in that location. 269 */ 270 static inline void drm_framebuffer_assign(struct drm_framebuffer **p, 271 struct drm_framebuffer *fb) 272 { 273 if (fb) 274 drm_framebuffer_get(fb); 275 if (*p) 276 drm_framebuffer_put(*p); 277 *p = fb; 278 } 279 280 /* 281 * drm_for_each_fb - iterate over all framebuffers 282 * @fb: the loop cursor 283 * @dev: the DRM device 284 * 285 * Iterate over all framebuffers of @dev. User must hold 286 * &drm_mode_config.fb_lock. 287 */ 288 #define drm_for_each_fb(fb, dev) \ 289 for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ 290 fb = list_first_entry(&(dev)->mode_config.fb_list, \ 291 struct drm_framebuffer, head); \ 292 &fb->head != (&(dev)->mode_config.fb_list); \ 293 fb = list_next_entry(fb, head)) 294 295 int drm_framebuffer_plane_width(int width, 296 const struct drm_framebuffer *fb, int plane); 297 int drm_framebuffer_plane_height(int height, 298 const struct drm_framebuffer *fb, int plane); 299 300 #endif 301