drm_mode_config.c revision 1.1
1 /* $NetBSD: drm_mode_config.c,v 1.1 2021/12/18 20:11:03 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2016 Intel Corporation 5 * 6 * Permission to use, copy, modify, distribute, and sell this software and its 7 * documentation for any purpose is hereby granted without fee, provided that 8 * the above copyright notice appear in all copies and that both that copyright 9 * notice and this permission notice appear in supporting documentation, and 10 * that the name of the copyright holders not be used in advertising or 11 * publicity pertaining to distribution of the software without specific, 12 * written prior permission. The copyright holders make no representations 13 * about the suitability of this software for any purpose. It is provided "as 14 * is" without express or implied warranty. 15 * 16 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 18 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 20 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 21 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 22 * OF THIS SOFTWARE. 23 */ 24 25 #include <sys/cdefs.h> 26 __KERNEL_RCSID(0, "$NetBSD: drm_mode_config.c,v 1.1 2021/12/18 20:11:03 riastradh Exp $"); 27 28 #include <linux/uaccess.h> 29 30 #include <drm/drm_drv.h> 31 #include <drm/drm_encoder.h> 32 #include <drm/drm_file.h> 33 #include <drm/drm_mode_config.h> 34 #include <drm/drm_print.h> 35 #include <linux/dma-resv.h> 36 37 #include "drm_crtc_internal.h" 38 #include "drm_internal.h" 39 40 int drm_modeset_register_all(struct drm_device *dev) 41 { 42 int ret; 43 44 ret = drm_plane_register_all(dev); 45 if (ret) 46 goto err_plane; 47 48 ret = drm_crtc_register_all(dev); 49 if (ret) 50 goto err_crtc; 51 52 ret = drm_encoder_register_all(dev); 53 if (ret) 54 goto err_encoder; 55 56 ret = drm_connector_register_all(dev); 57 if (ret) 58 goto err_connector; 59 60 return 0; 61 62 err_connector: 63 drm_encoder_unregister_all(dev); 64 err_encoder: 65 drm_crtc_unregister_all(dev); 66 err_crtc: 67 drm_plane_unregister_all(dev); 68 err_plane: 69 return ret; 70 } 71 72 void drm_modeset_unregister_all(struct drm_device *dev) 73 { 74 drm_connector_unregister_all(dev); 75 drm_encoder_unregister_all(dev); 76 drm_crtc_unregister_all(dev); 77 drm_plane_unregister_all(dev); 78 } 79 80 /** 81 * drm_mode_getresources - get graphics configuration 82 * @dev: drm device for the ioctl 83 * @data: data pointer for the ioctl 84 * @file_priv: drm file for the ioctl call 85 * 86 * Construct a set of configuration description structures and return 87 * them to the user, including CRTC, connector and framebuffer configuration. 88 * 89 * Called by the user via ioctl. 90 * 91 * Returns: 92 * Zero on success, negative errno on failure. 93 */ 94 int drm_mode_getresources(struct drm_device *dev, void *data, 95 struct drm_file *file_priv) 96 { 97 struct drm_mode_card_res *card_res = data; 98 struct drm_framebuffer *fb; 99 struct drm_connector *connector; 100 struct drm_crtc *crtc; 101 struct drm_encoder *encoder; 102 int count, ret = 0; 103 uint32_t __user *fb_id; 104 uint32_t __user *crtc_id; 105 uint32_t __user *connector_id; 106 uint32_t __user *encoder_id; 107 struct drm_connector_list_iter conn_iter; 108 109 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 110 return -EOPNOTSUPP; 111 112 mutex_lock(&file_priv->fbs_lock); 113 count = 0; 114 fb_id = u64_to_user_ptr(card_res->fb_id_ptr); 115 list_for_each_entry(fb, &file_priv->fbs, filp_head) { 116 if (count < card_res->count_fbs && 117 put_user(fb->base.id, fb_id + count)) { 118 mutex_unlock(&file_priv->fbs_lock); 119 return -EFAULT; 120 } 121 count++; 122 } 123 card_res->count_fbs = count; 124 mutex_unlock(&file_priv->fbs_lock); 125 126 card_res->max_height = dev->mode_config.max_height; 127 card_res->min_height = dev->mode_config.min_height; 128 card_res->max_width = dev->mode_config.max_width; 129 card_res->min_width = dev->mode_config.min_width; 130 131 count = 0; 132 crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr); 133 drm_for_each_crtc(crtc, dev) { 134 if (drm_lease_held(file_priv, crtc->base.id)) { 135 if (count < card_res->count_crtcs && 136 put_user(crtc->base.id, crtc_id + count)) 137 return -EFAULT; 138 count++; 139 } 140 } 141 card_res->count_crtcs = count; 142 143 count = 0; 144 encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr); 145 drm_for_each_encoder(encoder, dev) { 146 if (count < card_res->count_encoders && 147 put_user(encoder->base.id, encoder_id + count)) 148 return -EFAULT; 149 count++; 150 } 151 card_res->count_encoders = count; 152 153 drm_connector_list_iter_begin(dev, &conn_iter); 154 count = 0; 155 connector_id = u64_to_user_ptr(card_res->connector_id_ptr); 156 drm_for_each_connector_iter(connector, &conn_iter) { 157 /* only expose writeback connectors if userspace understands them */ 158 if (!file_priv->writeback_connectors && 159 (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)) 160 continue; 161 162 if (drm_lease_held(file_priv, connector->base.id)) { 163 if (count < card_res->count_connectors && 164 put_user(connector->base.id, connector_id + count)) { 165 drm_connector_list_iter_end(&conn_iter); 166 return -EFAULT; 167 } 168 count++; 169 } 170 } 171 card_res->count_connectors = count; 172 drm_connector_list_iter_end(&conn_iter); 173 174 return ret; 175 } 176 177 /** 178 * drm_mode_config_reset - call ->reset callbacks 179 * @dev: drm device 180 * 181 * This functions calls all the crtc's, encoder's and connector's ->reset 182 * callback. Drivers can use this in e.g. their driver load or resume code to 183 * reset hardware and software state. 184 */ 185 void drm_mode_config_reset(struct drm_device *dev) 186 { 187 struct drm_crtc *crtc; 188 struct drm_plane *plane; 189 struct drm_encoder *encoder; 190 struct drm_connector *connector; 191 struct drm_connector_list_iter conn_iter; 192 193 drm_for_each_plane(plane, dev) 194 if (plane->funcs->reset) 195 plane->funcs->reset(plane); 196 197 drm_for_each_crtc(crtc, dev) 198 if (crtc->funcs->reset) 199 crtc->funcs->reset(crtc); 200 201 drm_for_each_encoder(encoder, dev) 202 if (encoder->funcs->reset) 203 encoder->funcs->reset(encoder); 204 205 drm_connector_list_iter_begin(dev, &conn_iter); 206 drm_for_each_connector_iter(connector, &conn_iter) 207 if (connector->funcs->reset) 208 connector->funcs->reset(connector); 209 drm_connector_list_iter_end(&conn_iter); 210 } 211 EXPORT_SYMBOL(drm_mode_config_reset); 212 213 /* 214 * Global properties 215 */ 216 static const struct drm_prop_enum_list drm_plane_type_enum_list[] = { 217 { DRM_PLANE_TYPE_OVERLAY, "Overlay" }, 218 { DRM_PLANE_TYPE_PRIMARY, "Primary" }, 219 { DRM_PLANE_TYPE_CURSOR, "Cursor" }, 220 }; 221 222 static int drm_mode_create_standard_properties(struct drm_device *dev) 223 { 224 struct drm_property *prop; 225 int ret; 226 227 ret = drm_connector_create_standard_properties(dev); 228 if (ret) 229 return ret; 230 231 prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE, 232 "type", drm_plane_type_enum_list, 233 ARRAY_SIZE(drm_plane_type_enum_list)); 234 if (!prop) 235 return -ENOMEM; 236 dev->mode_config.plane_type_property = prop; 237 238 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 239 "SRC_X", 0, UINT_MAX); 240 if (!prop) 241 return -ENOMEM; 242 dev->mode_config.prop_src_x = prop; 243 244 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 245 "SRC_Y", 0, UINT_MAX); 246 if (!prop) 247 return -ENOMEM; 248 dev->mode_config.prop_src_y = prop; 249 250 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 251 "SRC_W", 0, UINT_MAX); 252 if (!prop) 253 return -ENOMEM; 254 dev->mode_config.prop_src_w = prop; 255 256 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 257 "SRC_H", 0, UINT_MAX); 258 if (!prop) 259 return -ENOMEM; 260 dev->mode_config.prop_src_h = prop; 261 262 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC, 263 "CRTC_X", INT_MIN, INT_MAX); 264 if (!prop) 265 return -ENOMEM; 266 dev->mode_config.prop_crtc_x = prop; 267 268 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC, 269 "CRTC_Y", INT_MIN, INT_MAX); 270 if (!prop) 271 return -ENOMEM; 272 dev->mode_config.prop_crtc_y = prop; 273 274 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 275 "CRTC_W", 0, INT_MAX); 276 if (!prop) 277 return -ENOMEM; 278 dev->mode_config.prop_crtc_w = prop; 279 280 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 281 "CRTC_H", 0, INT_MAX); 282 if (!prop) 283 return -ENOMEM; 284 dev->mode_config.prop_crtc_h = prop; 285 286 prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC, 287 "FB_ID", DRM_MODE_OBJECT_FB); 288 if (!prop) 289 return -ENOMEM; 290 dev->mode_config.prop_fb_id = prop; 291 292 prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC, 293 "IN_FENCE_FD", -1, INT_MAX); 294 if (!prop) 295 return -ENOMEM; 296 dev->mode_config.prop_in_fence_fd = prop; 297 298 prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 299 "OUT_FENCE_PTR", 0, U64_MAX); 300 if (!prop) 301 return -ENOMEM; 302 dev->mode_config.prop_out_fence_ptr = prop; 303 304 prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC, 305 "CRTC_ID", DRM_MODE_OBJECT_CRTC); 306 if (!prop) 307 return -ENOMEM; 308 dev->mode_config.prop_crtc_id = prop; 309 310 prop = drm_property_create(dev, 311 DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB, 312 "FB_DAMAGE_CLIPS", 0); 313 if (!prop) 314 return -ENOMEM; 315 dev->mode_config.prop_fb_damage_clips = prop; 316 317 prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC, 318 "ACTIVE"); 319 if (!prop) 320 return -ENOMEM; 321 dev->mode_config.prop_active = prop; 322 323 prop = drm_property_create(dev, 324 DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB, 325 "MODE_ID", 0); 326 if (!prop) 327 return -ENOMEM; 328 dev->mode_config.prop_mode_id = prop; 329 330 prop = drm_property_create_bool(dev, 0, 331 "VRR_ENABLED"); 332 if (!prop) 333 return -ENOMEM; 334 dev->mode_config.prop_vrr_enabled = prop; 335 336 prop = drm_property_create(dev, 337 DRM_MODE_PROP_BLOB, 338 "DEGAMMA_LUT", 0); 339 if (!prop) 340 return -ENOMEM; 341 dev->mode_config.degamma_lut_property = prop; 342 343 prop = drm_property_create_range(dev, 344 DRM_MODE_PROP_IMMUTABLE, 345 "DEGAMMA_LUT_SIZE", 0, UINT_MAX); 346 if (!prop) 347 return -ENOMEM; 348 dev->mode_config.degamma_lut_size_property = prop; 349 350 prop = drm_property_create(dev, 351 DRM_MODE_PROP_BLOB, 352 "CTM", 0); 353 if (!prop) 354 return -ENOMEM; 355 dev->mode_config.ctm_property = prop; 356 357 prop = drm_property_create(dev, 358 DRM_MODE_PROP_BLOB, 359 "GAMMA_LUT", 0); 360 if (!prop) 361 return -ENOMEM; 362 dev->mode_config.gamma_lut_property = prop; 363 364 prop = drm_property_create_range(dev, 365 DRM_MODE_PROP_IMMUTABLE, 366 "GAMMA_LUT_SIZE", 0, UINT_MAX); 367 if (!prop) 368 return -ENOMEM; 369 dev->mode_config.gamma_lut_size_property = prop; 370 371 prop = drm_property_create(dev, 372 DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB, 373 "IN_FORMATS", 0); 374 if (!prop) 375 return -ENOMEM; 376 dev->mode_config.modifiers_property = prop; 377 378 return 0; 379 } 380 381 /** 382 * drm_mode_config_init - initialize DRM mode_configuration structure 383 * @dev: DRM device 384 * 385 * Initialize @dev's mode_config structure, used for tracking the graphics 386 * configuration of @dev. 387 * 388 * Since this initializes the modeset locks, no locking is possible. Which is no 389 * problem, since this should happen single threaded at init time. It is the 390 * driver's problem to ensure this guarantee. 391 * 392 */ 393 void drm_mode_config_init(struct drm_device *dev) 394 { 395 mutex_init(&dev->mode_config.mutex); 396 drm_modeset_lock_init(&dev->mode_config.connection_mutex); 397 mutex_init(&dev->mode_config.idr_mutex); 398 mutex_init(&dev->mode_config.fb_lock); 399 mutex_init(&dev->mode_config.blob_lock); 400 INIT_LIST_HEAD(&dev->mode_config.fb_list); 401 INIT_LIST_HEAD(&dev->mode_config.crtc_list); 402 INIT_LIST_HEAD(&dev->mode_config.connector_list); 403 INIT_LIST_HEAD(&dev->mode_config.encoder_list); 404 INIT_LIST_HEAD(&dev->mode_config.property_list); 405 INIT_LIST_HEAD(&dev->mode_config.property_blob_list); 406 INIT_LIST_HEAD(&dev->mode_config.plane_list); 407 INIT_LIST_HEAD(&dev->mode_config.privobj_list); 408 idr_init(&dev->mode_config.object_idr); 409 idr_init(&dev->mode_config.tile_idr); 410 ida_init(&dev->mode_config.connector_ida); 411 spin_lock_init(&dev->mode_config.connector_list_lock); 412 413 init_llist_head(&dev->mode_config.connector_free_list); 414 INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn); 415 416 drm_mode_create_standard_properties(dev); 417 418 /* Just to be sure */ 419 dev->mode_config.num_fb = 0; 420 dev->mode_config.num_connector = 0; 421 dev->mode_config.num_crtc = 0; 422 dev->mode_config.num_encoder = 0; 423 dev->mode_config.num_total_plane = 0; 424 425 if (IS_ENABLED(CONFIG_LOCKDEP)) { 426 struct drm_modeset_acquire_ctx modeset_ctx; 427 struct ww_acquire_ctx resv_ctx; 428 struct dma_resv resv; 429 int ret; 430 431 dma_resv_init(&resv); 432 433 drm_modeset_acquire_init(&modeset_ctx, 0); 434 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, 435 &modeset_ctx); 436 if (ret == -EDEADLK) 437 ret = drm_modeset_backoff(&modeset_ctx); 438 439 ww_acquire_init(&resv_ctx, &reservation_ww_class); 440 ret = dma_resv_lock(&resv, &resv_ctx); 441 if (ret == -EDEADLK) 442 dma_resv_lock_slow(&resv, &resv_ctx); 443 444 dma_resv_unlock(&resv); 445 ww_acquire_fini(&resv_ctx); 446 447 drm_modeset_drop_locks(&modeset_ctx); 448 drm_modeset_acquire_fini(&modeset_ctx); 449 dma_resv_fini(&resv); 450 } 451 } 452 EXPORT_SYMBOL(drm_mode_config_init); 453 454 /** 455 * drm_mode_config_cleanup - free up DRM mode_config info 456 * @dev: DRM device 457 * 458 * Free up all the connectors and CRTCs associated with this DRM device, then 459 * free up the framebuffers and associated buffer objects. 460 * 461 * Note that since this /should/ happen single-threaded at driver/device 462 * teardown time, no locking is required. It's the driver's job to ensure that 463 * this guarantee actually holds true. 464 */ 465 void drm_mode_config_cleanup(struct drm_device *dev) 466 { 467 struct drm_connector *connector; 468 struct drm_connector_list_iter conn_iter; 469 struct drm_crtc *crtc, *ct; 470 struct drm_encoder *encoder, *enct; 471 struct drm_framebuffer *fb, *fbt; 472 struct drm_property *property, *pt; 473 struct drm_property_blob *blob, *bt; 474 struct drm_plane *plane, *plt; 475 476 list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list, 477 head) { 478 encoder->funcs->destroy(encoder); 479 } 480 481 drm_connector_list_iter_begin(dev, &conn_iter); 482 drm_for_each_connector_iter(connector, &conn_iter) { 483 /* drm_connector_list_iter holds an full reference to the 484 * current connector itself, which means it is inherently safe 485 * against unreferencing the current connector - but not against 486 * deleting it right away. */ 487 drm_connector_put(connector); 488 } 489 drm_connector_list_iter_end(&conn_iter); 490 /* connector_iter drops references in a work item. */ 491 flush_work(&dev->mode_config.connector_free_work); 492 if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) { 493 drm_connector_list_iter_begin(dev, &conn_iter); 494 drm_for_each_connector_iter(connector, &conn_iter) 495 DRM_ERROR("connector %s leaked!\n", connector->name); 496 drm_connector_list_iter_end(&conn_iter); 497 } 498 499 list_for_each_entry_safe(property, pt, &dev->mode_config.property_list, 500 head) { 501 drm_property_destroy(dev, property); 502 } 503 504 list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list, 505 head) { 506 plane->funcs->destroy(plane); 507 } 508 509 list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) { 510 crtc->funcs->destroy(crtc); 511 } 512 513 list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list, 514 head_global) { 515 drm_property_blob_put(blob); 516 } 517 518 /* 519 * Single-threaded teardown context, so it's not required to grab the 520 * fb_lock to protect against concurrent fb_list access. Contrary, it 521 * would actually deadlock with the drm_framebuffer_cleanup function. 522 * 523 * Also, if there are any framebuffers left, that's a driver leak now, 524 * so politely WARN about this. 525 */ 526 WARN_ON(!list_empty(&dev->mode_config.fb_list)); 527 list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) { 528 struct drm_printer p = drm_debug_printer("[leaked fb]"); 529 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id); 530 drm_framebuffer_print_info(&p, 1, fb); 531 drm_framebuffer_free(&fb->base.refcount); 532 } 533 534 ida_destroy(&dev->mode_config.connector_ida); 535 idr_destroy(&dev->mode_config.tile_idr); 536 idr_destroy(&dev->mode_config.object_idr); 537 drm_modeset_lock_fini(&dev->mode_config.connection_mutex); 538 } 539 EXPORT_SYMBOL(drm_mode_config_cleanup); 540
Indexes created Sat Oct 18 23:09:54 GMT 2025