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 #include <linux/export.h> 24 #include <drm/drmP.h> 25 #include <drm/drm_mode_object.h> 26 #include <drm/drm_atomic.h> 27 28 #include "drm_crtc_internal.h" 29 30 /* 31 * Internal function to assign a slot in the object idr and optionally 32 * register the object into the idr. 33 */ 34 int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj, 35 uint32_t obj_type, bool register_obj, 36 void (*obj_free_cb)(struct kref *kref)) 37 { 38 int ret; 39 40 mutex_lock(&dev->mode_config.idr_mutex); 41 ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL); 42 if (ret >= 0) { 43 /* 44 * Set up the object linking under the protection of the idr 45 * lock so that other users can't see inconsistent state. 46 */ 47 obj->id = ret; 48 obj->type = obj_type; 49 if (obj_free_cb) { 50 obj->free_cb = obj_free_cb; 51 kref_init(&obj->refcount); 52 } 53 } 54 mutex_unlock(&dev->mode_config.idr_mutex); 55 56 return ret < 0 ? ret : 0; 57 } 58 59 /** 60 * drm_mode_object_add - allocate a new modeset identifier 61 * @dev: DRM device 62 * @obj: object pointer, used to generate unique ID 63 * @obj_type: object type 64 * 65 * Create a unique identifier based on @ptr in @dev's identifier space. Used 66 * for tracking modes, CRTCs and connectors. 67 * 68 * Returns: 69 * Zero on success, error code on failure. 70 */ 71 int drm_mode_object_add(struct drm_device *dev, 72 struct drm_mode_object *obj, uint32_t obj_type) 73 { 74 return __drm_mode_object_add(dev, obj, obj_type, true, NULL); 75 } 76 77 void drm_mode_object_register(struct drm_device *dev, 78 struct drm_mode_object *obj) 79 { 80 mutex_lock(&dev->mode_config.idr_mutex); 81 idr_replace(&dev->mode_config.crtc_idr, obj, obj->id); 82 mutex_unlock(&dev->mode_config.idr_mutex); 83 } 84 85 /** 86 * drm_mode_object_unregister - free a modeset identifer 87 * @dev: DRM device 88 * @object: object to free 89 * 90 * Free @id from @dev's unique identifier pool. 91 * This function can be called multiple times, and guards against 92 * multiple removals. 93 * These modeset identifiers are _not_ reference counted. Hence don't use this 94 * for reference counted modeset objects like framebuffers. 95 */ 96 void drm_mode_object_unregister(struct drm_device *dev, 97 struct drm_mode_object *object) 98 { 99 mutex_lock(&dev->mode_config.idr_mutex); 100 if (object->id) { 101 idr_remove(&dev->mode_config.crtc_idr, object->id); 102 object->id = 0; 103 } 104 mutex_unlock(&dev->mode_config.idr_mutex); 105 } 106 107 /** 108 * drm_lease_required - check types which must be leased to be used 109 * @type: type of object 110 * 111 * Returns whether the provided type of drm_mode_object must 112 * be owned or leased to be used by a process. 113 */ 114 bool drm_mode_object_lease_required(uint32_t type) 115 { 116 switch(type) { 117 case DRM_MODE_OBJECT_CRTC: 118 case DRM_MODE_OBJECT_CONNECTOR: 119 case DRM_MODE_OBJECT_PLANE: 120 return true; 121 default: 122 return false; 123 } 124 } 125 126 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev, 127 struct drm_file *file_priv, 128 uint32_t id, uint32_t type) 129 { 130 struct drm_mode_object *obj = NULL; 131 132 mutex_lock(&dev->mode_config.idr_mutex); 133 obj = idr_find(&dev->mode_config.crtc_idr, id); 134 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type) 135 obj = NULL; 136 if (obj && obj->id != id) 137 obj = NULL; 138 139 #if 0 140 if (obj && drm_mode_object_lease_required(obj->type) && 141 !_drm_lease_held(file_priv, obj->id)) 142 obj = NULL; 143 #endif 144 145 if (obj && obj->free_cb) { 146 if (!kref_get_unless_zero(&obj->refcount)) 147 obj = NULL; 148 } 149 mutex_unlock(&dev->mode_config.idr_mutex); 150 151 return obj; 152 } 153 154 /** 155 * drm_mode_object_find - look up a drm object with static lifetime 156 * @dev: drm device 157 * @file_priv: drm file 158 * @id: id of the mode object 159 * @type: type of the mode object 160 * 161 * This function is used to look up a modeset object. It will acquire a 162 * reference for reference counted objects. This reference must be dropped again 163 * by callind drm_mode_object_put(). 164 */ 165 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev, 166 struct drm_file *file_priv, 167 uint32_t id, uint32_t type) 168 { 169 struct drm_mode_object *obj = NULL; 170 171 obj = __drm_mode_object_find(dev, file_priv, id, type); 172 return obj; 173 } 174 EXPORT_SYMBOL(drm_mode_object_find); 175 176 /** 177 * drm_mode_object_put - release a mode object reference 178 * @obj: DRM mode object 179 * 180 * This function decrements the object's refcount if it is a refcounted modeset 181 * object. It is a no-op on any other object. This is used to drop references 182 * acquired with drm_mode_object_get(). 183 */ 184 void drm_mode_object_put(struct drm_mode_object *obj) 185 { 186 if (obj->free_cb) { 187 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount)); 188 kref_put(&obj->refcount, obj->free_cb); 189 } 190 } 191 EXPORT_SYMBOL(drm_mode_object_put); 192 193 /** 194 * drm_mode_object_get - acquire a mode object reference 195 * @obj: DRM mode object 196 * 197 * This function increments the object's refcount if it is a refcounted modeset 198 * object. It is a no-op on any other object. References should be dropped again 199 * by calling drm_mode_object_put(). 200 */ 201 void drm_mode_object_get(struct drm_mode_object *obj) 202 { 203 if (obj->free_cb) { 204 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount)); 205 kref_get(&obj->refcount); 206 } 207 } 208 EXPORT_SYMBOL(drm_mode_object_get); 209 210 /** 211 * drm_object_attach_property - attach a property to a modeset object 212 * @obj: drm modeset object 213 * @property: property to attach 214 * @init_val: initial value of the property 215 * 216 * This attaches the given property to the modeset object with the given initial 217 * value. Currently this function cannot fail since the properties are stored in 218 * a statically sized array. 219 */ 220 void drm_object_attach_property(struct drm_mode_object *obj, 221 struct drm_property *property, 222 uint64_t init_val) 223 { 224 int count = obj->properties->count; 225 226 if (count == DRM_OBJECT_MAX_PROPERTY) { 227 WARN(1, "Failed to attach object property (type: 0x%x). Please " 228 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time " 229 "you see this message on the same object type.\n", 230 obj->type); 231 return; 232 } 233 234 obj->properties->properties[count] = property; 235 obj->properties->values[count] = init_val; 236 obj->properties->count++; 237 } 238 EXPORT_SYMBOL(drm_object_attach_property); 239 240 /** 241 * drm_object_property_set_value - set the value of a property 242 * @obj: drm mode object to set property value for 243 * @property: property to set 244 * @val: value the property should be set to 245 * 246 * This function sets a given property on a given object. This function only 247 * changes the software state of the property, it does not call into the 248 * driver's ->set_property callback. 249 * 250 * Note that atomic drivers should not have any need to call this, the core will 251 * ensure consistency of values reported back to userspace through the 252 * appropriate ->atomic_get_property callback. Only legacy drivers should call 253 * this function to update the tracked value (after clamping and other 254 * restrictions have been applied). 255 * 256 * Returns: 257 * Zero on success, error code on failure. 258 */ 259 int drm_object_property_set_value(struct drm_mode_object *obj, 260 struct drm_property *property, uint64_t val) 261 { 262 int i; 263 264 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) && 265 !(property->flags & DRM_MODE_PROP_IMMUTABLE)); 266 267 for (i = 0; i < obj->properties->count; i++) { 268 if (obj->properties->properties[i] == property) { 269 obj->properties->values[i] = val; 270 return 0; 271 } 272 } 273 274 return -EINVAL; 275 } 276 EXPORT_SYMBOL(drm_object_property_set_value); 277 278 static int __drm_object_property_get_value(struct drm_mode_object *obj, 279 struct drm_property *property, 280 uint64_t *val) 281 { 282 int i; 283 284 /* read-only properties bypass atomic mechanism and still store 285 * their value in obj->properties->values[].. mostly to avoid 286 * having to deal w/ EDID and similar props in atomic paths: 287 */ 288 if (drm_drv_uses_atomic_modeset(property->dev) && 289 !(property->flags & DRM_MODE_PROP_IMMUTABLE)) 290 return drm_atomic_get_property(obj, property, val); 291 292 for (i = 0; i < obj->properties->count; i++) { 293 if (obj->properties->properties[i] == property) { 294 *val = obj->properties->values[i]; 295 return 0; 296 } 297 298 } 299 300 return -EINVAL; 301 } 302 303 /** 304 * drm_object_property_get_value - retrieve the value of a property 305 * @obj: drm mode object to get property value from 306 * @property: property to retrieve 307 * @val: storage for the property value 308 * 309 * This function retrieves the softare state of the given property for the given 310 * property. Since there is no driver callback to retrieve the current property 311 * value this might be out of sync with the hardware, depending upon the driver 312 * and property. 313 * 314 * Atomic drivers should never call this function directly, the core will read 315 * out property values through the various ->atomic_get_property callbacks. 316 * 317 * Returns: 318 * Zero on success, error code on failure. 319 */ 320 int drm_object_property_get_value(struct drm_mode_object *obj, 321 struct drm_property *property, uint64_t *val) 322 { 323 WARN_ON(drm_drv_uses_atomic_modeset(property->dev)); 324 325 return __drm_object_property_get_value(obj, property, val); 326 } 327 EXPORT_SYMBOL(drm_object_property_get_value); 328 329 /* helper for getconnector and getproperties ioctls */ 330 int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, 331 uint32_t __user *prop_ptr, 332 uint64_t __user *prop_values, 333 uint32_t *arg_count_props) 334 { 335 int i, ret, count; 336 337 for (i = 0, count = 0; i < obj->properties->count; i++) { 338 struct drm_property *prop = obj->properties->properties[i]; 339 uint64_t val; 340 341 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic) 342 continue; 343 344 if (*arg_count_props > count) { 345 ret = __drm_object_property_get_value(obj, prop, &val); 346 if (ret) 347 return ret; 348 349 if (put_user(prop->base.id, prop_ptr + count)) 350 return -EFAULT; 351 352 if (put_user(val, prop_values + count)) 353 return -EFAULT; 354 } 355 356 count++; 357 } 358 *arg_count_props = count; 359 360 return 0; 361 } 362 363 /** 364 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property 365 * @dev: DRM device 366 * @data: ioctl data 367 * @file_priv: DRM file info 368 * 369 * This function retrieves the current value for an object's property. Compared 370 * to the connector specific ioctl this one is extended to also work on crtc and 371 * plane objects. 372 * 373 * Called by the user via ioctl. 374 * 375 * Returns: 376 * Zero on success, negative errno on failure. 377 */ 378 int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data, 379 struct drm_file *file_priv) 380 { 381 struct drm_mode_obj_get_properties *arg = data; 382 struct drm_mode_object *obj; 383 int ret = 0; 384 385 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 386 return -EINVAL; 387 388 drm_modeset_lock_all(dev); 389 390 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type); 391 if (!obj) { 392 ret = -ENOENT; 393 goto out; 394 } 395 if (!obj->properties) { 396 ret = -EINVAL; 397 goto out_unref; 398 } 399 400 ret = drm_mode_object_get_properties(obj, file_priv->atomic, 401 (uint32_t __user *)(unsigned long)(arg->props_ptr), 402 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr), 403 &arg->count_props); 404 405 out_unref: 406 drm_mode_object_put(obj); 407 out: 408 drm_modeset_unlock_all(dev); 409 return ret; 410 } 411 412 struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj, 413 uint32_t prop_id) 414 { 415 int i; 416 417 for (i = 0; i < obj->properties->count; i++) 418 if (obj->properties->properties[i]->base.id == prop_id) 419 return obj->properties->properties[i]; 420 421 return NULL; 422 } 423 424 static int set_property_legacy(struct drm_mode_object *obj, 425 struct drm_property *prop, 426 uint64_t prop_value) 427 { 428 struct drm_device *dev = prop->dev; 429 struct drm_mode_object *ref; 430 int ret = -EINVAL; 431 432 if (!drm_property_change_valid_get(prop, prop_value, &ref)) 433 return -EINVAL; 434 435 drm_modeset_lock_all(dev); 436 switch (obj->type) { 437 case DRM_MODE_OBJECT_CONNECTOR: 438 ret = drm_mode_connector_set_obj_prop(obj, prop, 439 prop_value); 440 break; 441 case DRM_MODE_OBJECT_CRTC: 442 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value); 443 break; 444 case DRM_MODE_OBJECT_PLANE: 445 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj), 446 prop, prop_value); 447 break; 448 } 449 drm_property_change_valid_put(prop, ref); 450 drm_modeset_unlock_all(dev); 451 452 return ret; 453 } 454 455 static int set_property_atomic(struct drm_mode_object *obj, 456 struct drm_property *prop, 457 uint64_t prop_value) 458 { 459 struct drm_device *dev = prop->dev; 460 struct drm_atomic_state *state; 461 struct drm_modeset_acquire_ctx ctx; 462 int ret; 463 464 drm_modeset_acquire_init(&ctx, 0); 465 466 state = drm_atomic_state_alloc(dev); 467 if (!state) 468 return -ENOMEM; 469 state->acquire_ctx = &ctx; 470 retry: 471 if (prop == state->dev->mode_config.dpms_property) { 472 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) { 473 ret = -EINVAL; 474 goto out; 475 } 476 477 ret = drm_atomic_connector_commit_dpms(state, 478 obj_to_connector(obj), 479 prop_value); 480 } else { 481 ret = drm_atomic_set_property(state, obj, prop, prop_value); 482 if (ret) 483 goto out; 484 ret = drm_atomic_commit(state); 485 } 486 out: 487 if (ret == -EDEADLK) { 488 drm_atomic_state_clear(state); 489 drm_modeset_backoff(&ctx); 490 goto retry; 491 } 492 493 drm_atomic_state_put(state); 494 495 drm_modeset_drop_locks(&ctx); 496 drm_modeset_acquire_fini(&ctx); 497 498 return ret; 499 } 500 501 int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data, 502 struct drm_file *file_priv) 503 { 504 struct drm_mode_obj_set_property *arg = data; 505 struct drm_mode_object *arg_obj; 506 struct drm_property *property; 507 int ret = -EINVAL; 508 509 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 510 return -EINVAL; 511 512 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type); 513 if (!arg_obj) 514 return -ENOENT; 515 516 if (!arg_obj->properties) 517 goto out_unref; 518 519 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id); 520 if (!property) 521 goto out_unref; 522 523 if (drm_drv_uses_atomic_modeset(property->dev)) 524 ret = set_property_atomic(arg_obj, property, arg->value); 525 else 526 ret = set_property_legacy(arg_obj, property, arg->value); 527 528 out_unref: 529 drm_mode_object_put(arg_obj); 530 return ret; 531 } 532