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 ->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 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 */ 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 dev->mode_config.fb_list, access protected by 116 * dev->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 * @format: framebuffer format information 126 */ 127 const struct drm_format_info *format; 128 /** 129 * @funcs: framebuffer vfunc table 130 */ 131 const struct drm_framebuffer_funcs *funcs; 132 /** 133 * @pitches: Line stride per buffer. For userspace created object this 134 * is copied from drm_mode_fb_cmd2. 135 */ 136 unsigned int pitches[4]; 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 */ 154 unsigned int offsets[4]; 155 /** 156 * @modifier: Data layout modifier. This is used to describe 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 */ 161 uint64_t modifier; 162 /** 163 * @width: Logical width of the visible area of the framebuffer, in 164 * pixels. 165 */ 166 unsigned int width; 167 /** 168 * @height: Logical height of the visible area of the framebuffer, in 169 * pixels. 170 */ 171 unsigned int height; 172 /** 173 * @bits_per_pixel: Storage used bits per pixel for RGB formats. 0 for 174 * everything else. Legacy information derived from @pixel_format, it's 175 * suggested to use the DRM FOURCC codes and helper functions directly 176 * instead. 177 */ 178 int bits_per_pixel; 179 /** 180 * @flags: Framebuffer flags like DRM_MODE_FB_INTERLACED or 181 * DRM_MODE_FB_MODIFIERS. 182 */ 183 int flags; 184 /** 185 * @pixel_format: DRM FOURCC code describing the pixel format. 186 */ 187 uint32_t pixel_format; /* fourcc format */ 188 /** 189 * @hot_x: X coordinate of the cursor hotspot. Used by the legacy cursor 190 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR 191 * universal plane. 192 */ 193 int hot_x; 194 /** 195 * @hot_y: Y coordinate of the cursor hotspot. Used by the legacy cursor 196 * IOCTL when the driver supports cursor through a DRM_PLANE_TYPE_CURSOR 197 * universal plane. 198 */ 199 int hot_y; 200 /** 201 * @filp_head: Placed on struct &drm_file fbs list_head, protected by 202 * fbs_lock in the same structure. 203 */ 204 struct list_head filp_head; 205 }; 206 207 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base) 208 209 int drm_framebuffer_init(struct drm_device *dev, 210 struct drm_framebuffer *fb, 211 const struct drm_framebuffer_funcs *funcs); 212 struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, 213 uint32_t id); 214 void drm_framebuffer_remove(struct drm_framebuffer *fb); 215 void drm_framebuffer_cleanup(struct drm_framebuffer *fb); 216 void drm_framebuffer_unregister_private(struct drm_framebuffer *fb); 217 218 /** 219 * drm_framebuffer_reference - incr the fb refcnt 220 * @fb: framebuffer 221 * 222 * This functions increments the fb's refcount. 223 */ 224 static inline void drm_framebuffer_reference(struct drm_framebuffer *fb) 225 { 226 drm_mode_object_reference(&fb->base); 227 } 228 229 /** 230 * drm_framebuffer_unreference - unref a framebuffer 231 * @fb: framebuffer to unref 232 * 233 * This functions decrements the fb's refcount and frees it if it drops to zero. 234 */ 235 static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb) 236 { 237 drm_mode_object_unreference(&fb->base); 238 } 239 240 /** 241 * drm_framebuffer_read_refcount - read the framebuffer reference count. 242 * @fb: framebuffer 243 * 244 * This functions returns the framebuffer's reference count. 245 */ 246 static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb) 247 { 248 return atomic_read(&fb->base.refcount.refcount); 249 } 250 251 /** 252 * drm_framebuffer_assign - store a reference to the fb 253 * @p: location to store framebuffer 254 * @fb: new framebuffer (maybe NULL) 255 * 256 * This functions sets the location to store a reference to the framebuffer, 257 * unreferencing the framebuffer that was previously stored in that location. 258 */ 259 static inline void drm_framebuffer_assign(struct drm_framebuffer **p, 260 struct drm_framebuffer *fb) 261 { 262 if (fb) 263 drm_framebuffer_reference(fb); 264 if (*p) 265 drm_framebuffer_unreference(*p); 266 *p = fb; 267 } 268 269 /* 270 * drm_for_each_fb - iterate over all framebuffers 271 * @fb: the loop cursor 272 * @dev: the DRM device 273 * 274 * Iterate over all framebuffers of @dev. User must hold the fb_lock from 275 * &drm_mode_config. 276 */ 277 #define drm_for_each_fb(fb, dev) \ 278 for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ 279 fb = list_first_entry(&(dev)->mode_config.fb_list, \ 280 struct drm_framebuffer, head); \ 281 &fb->head != (&(dev)->mode_config.fb_list); \ 282 fb = list_next_entry(fb, head)) 283 284 int drm_framebuffer_plane_width(int width, 285 const struct drm_framebuffer *fb, int plane); 286 int drm_framebuffer_plane_height(int height, 287 const struct drm_framebuffer *fb, int plane); 288 289 #endif 290