Commit | Line | Data |
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949619f3 DV |
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 | ||
27 | #include "drm_crtc_internal.h" | |
28 | ||
29 | /* | |
30 | * Internal function to assign a slot in the object idr and optionally | |
31 | * register the object into the idr. | |
32 | */ | |
33 | int drm_mode_object_get_reg(struct drm_device *dev, | |
34 | struct drm_mode_object *obj, | |
35 | uint32_t obj_type, | |
36 | bool register_obj, | |
37 | void (*obj_free_cb)(struct kref *kref)) | |
38 | { | |
39 | int ret; | |
40 | ||
41 | mutex_lock(&dev->mode_config.idr_mutex); | |
42 | ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL); | |
43 | if (ret >= 0) { | |
44 | /* | |
45 | * Set up the object linking under the protection of the idr | |
46 | * lock so that other users can't see inconsistent state. | |
47 | */ | |
48 | obj->id = ret; | |
49 | obj->type = obj_type; | |
50 | if (obj_free_cb) { | |
51 | obj->free_cb = obj_free_cb; | |
52 | kref_init(&obj->refcount); | |
53 | } | |
54 | } | |
55 | mutex_unlock(&dev->mode_config.idr_mutex); | |
56 | ||
57 | return ret < 0 ? ret : 0; | |
58 | } | |
59 | ||
60 | /** | |
61 | * drm_mode_object_get - allocate a new modeset identifier | |
62 | * @dev: DRM device | |
63 | * @obj: object pointer, used to generate unique ID | |
64 | * @obj_type: object type | |
65 | * | |
66 | * Create a unique identifier based on @ptr in @dev's identifier space. Used | |
67 | * for tracking modes, CRTCs and connectors. Note that despite the _get postfix | |
68 | * modeset identifiers are _not_ reference counted. Hence don't use this for | |
69 | * reference counted modeset objects like framebuffers. | |
70 | * | |
71 | * Returns: | |
72 | * Zero on success, error code on failure. | |
73 | */ | |
74 | int drm_mode_object_get(struct drm_device *dev, | |
75 | struct drm_mode_object *obj, uint32_t obj_type) | |
76 | { | |
77 | return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL); | |
78 | } | |
79 | ||
80 | void drm_mode_object_register(struct drm_device *dev, | |
81 | struct drm_mode_object *obj) | |
82 | { | |
83 | mutex_lock(&dev->mode_config.idr_mutex); | |
84 | idr_replace(&dev->mode_config.crtc_idr, obj, obj->id); | |
85 | mutex_unlock(&dev->mode_config.idr_mutex); | |
86 | } | |
87 | ||
88 | /** | |
89 | * drm_mode_object_unregister - free a modeset identifer | |
90 | * @dev: DRM device | |
91 | * @object: object to free | |
92 | * | |
93 | * Free @id from @dev's unique identifier pool. | |
94 | * This function can be called multiple times, and guards against | |
95 | * multiple removals. | |
96 | * These modeset identifiers are _not_ reference counted. Hence don't use this | |
97 | * for reference counted modeset objects like framebuffers. | |
98 | */ | |
99 | void drm_mode_object_unregister(struct drm_device *dev, | |
a2511a55 | 100 | struct drm_mode_object *object) |
949619f3 DV |
101 | { |
102 | mutex_lock(&dev->mode_config.idr_mutex); | |
103 | if (object->id) { | |
104 | idr_remove(&dev->mode_config.crtc_idr, object->id); | |
105 | object->id = 0; | |
106 | } | |
107 | mutex_unlock(&dev->mode_config.idr_mutex); | |
108 | } | |
109 | ||
110 | struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev, | |
111 | uint32_t id, uint32_t type) | |
112 | { | |
113 | struct drm_mode_object *obj = NULL; | |
114 | ||
115 | mutex_lock(&dev->mode_config.idr_mutex); | |
116 | obj = idr_find(&dev->mode_config.crtc_idr, id); | |
117 | if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type) | |
118 | obj = NULL; | |
119 | if (obj && obj->id != id) | |
120 | obj = NULL; | |
121 | ||
122 | if (obj && obj->free_cb) { | |
123 | if (!kref_get_unless_zero(&obj->refcount)) | |
124 | obj = NULL; | |
125 | } | |
126 | mutex_unlock(&dev->mode_config.idr_mutex); | |
127 | ||
128 | return obj; | |
129 | } | |
130 | ||
131 | /** | |
132 | * drm_mode_object_find - look up a drm object with static lifetime | |
133 | * @dev: drm device | |
134 | * @id: id of the mode object | |
135 | * @type: type of the mode object | |
136 | * | |
137 | * This function is used to look up a modeset object. It will acquire a | |
138 | * reference for reference counted objects. This reference must be dropped again | |
139 | * by callind drm_mode_object_unreference(). | |
140 | */ | |
141 | struct drm_mode_object *drm_mode_object_find(struct drm_device *dev, | |
142 | uint32_t id, uint32_t type) | |
143 | { | |
144 | struct drm_mode_object *obj = NULL; | |
145 | ||
146 | obj = __drm_mode_object_find(dev, id, type); | |
147 | return obj; | |
148 | } | |
149 | EXPORT_SYMBOL(drm_mode_object_find); | |
150 | ||
151 | /** | |
152 | * drm_mode_object_unreference - decr the object refcnt | |
153 | * @obj: mode_object | |
154 | * | |
a2511a55 | 155 | * This function decrements the object's refcount if it is a refcounted modeset |
949619f3 DV |
156 | * object. It is a no-op on any other object. This is used to drop references |
157 | * acquired with drm_mode_object_reference(). | |
158 | */ | |
159 | void drm_mode_object_unreference(struct drm_mode_object *obj) | |
160 | { | |
161 | if (obj->free_cb) { | |
162 | DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount)); | |
163 | kref_put(&obj->refcount, obj->free_cb); | |
164 | } | |
165 | } | |
166 | EXPORT_SYMBOL(drm_mode_object_unreference); | |
167 | ||
168 | /** | |
169 | * drm_mode_object_reference - incr the object refcnt | |
170 | * @obj: mode_object | |
171 | * | |
a2511a55 | 172 | * This function increments the object's refcount if it is a refcounted modeset |
949619f3 DV |
173 | * object. It is a no-op on any other object. References should be dropped again |
174 | * by calling drm_mode_object_unreference(). | |
175 | */ | |
176 | void drm_mode_object_reference(struct drm_mode_object *obj) | |
177 | { | |
178 | if (obj->free_cb) { | |
179 | DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount)); | |
180 | kref_get(&obj->refcount); | |
181 | } | |
182 | } | |
183 | EXPORT_SYMBOL(drm_mode_object_reference); | |
184 | ||
185 | /** | |
186 | * drm_object_attach_property - attach a property to a modeset object | |
187 | * @obj: drm modeset object | |
188 | * @property: property to attach | |
189 | * @init_val: initial value of the property | |
190 | * | |
191 | * This attaches the given property to the modeset object with the given initial | |
192 | * value. Currently this function cannot fail since the properties are stored in | |
193 | * a statically sized array. | |
194 | */ | |
195 | void drm_object_attach_property(struct drm_mode_object *obj, | |
196 | struct drm_property *property, | |
197 | uint64_t init_val) | |
198 | { | |
199 | int count = obj->properties->count; | |
200 | ||
201 | if (count == DRM_OBJECT_MAX_PROPERTY) { | |
202 | WARN(1, "Failed to attach object property (type: 0x%x). Please " | |
203 | "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time " | |
204 | "you see this message on the same object type.\n", | |
205 | obj->type); | |
206 | return; | |
207 | } | |
208 | ||
209 | obj->properties->properties[count] = property; | |
210 | obj->properties->values[count] = init_val; | |
211 | obj->properties->count++; | |
949619f3 DV |
212 | } |
213 | EXPORT_SYMBOL(drm_object_attach_property); | |
214 | ||
215 | /** | |
216 | * drm_object_property_set_value - set the value of a property | |
217 | * @obj: drm mode object to set property value for | |
218 | * @property: property to set | |
219 | * @val: value the property should be set to | |
220 | * | |
a2511a55 | 221 | * This function sets a given property on a given object. This function only |
949619f3 DV |
222 | * changes the software state of the property, it does not call into the |
223 | * driver's ->set_property callback. | |
224 | * | |
a2511a55 DV |
225 | * Note that atomic drivers should not have any need to call this, the core will |
226 | * ensure consistency of values reported back to userspace through the | |
227 | * appropriate ->atomic_get_property callback. Only legacy drivers should call | |
228 | * this function to update the tracked value (after clamping and other | |
229 | * restrictions have been applied). | |
230 | * | |
949619f3 DV |
231 | * Returns: |
232 | * Zero on success, error code on failure. | |
233 | */ | |
234 | int drm_object_property_set_value(struct drm_mode_object *obj, | |
235 | struct drm_property *property, uint64_t val) | |
236 | { | |
237 | int i; | |
238 | ||
239 | for (i = 0; i < obj->properties->count; i++) { | |
240 | if (obj->properties->properties[i] == property) { | |
241 | obj->properties->values[i] = val; | |
242 | return 0; | |
243 | } | |
244 | } | |
245 | ||
246 | return -EINVAL; | |
247 | } | |
248 | EXPORT_SYMBOL(drm_object_property_set_value); | |
249 | ||
250 | /** | |
251 | * drm_object_property_get_value - retrieve the value of a property | |
252 | * @obj: drm mode object to get property value from | |
253 | * @property: property to retrieve | |
254 | * @val: storage for the property value | |
255 | * | |
256 | * This function retrieves the softare state of the given property for the given | |
257 | * property. Since there is no driver callback to retrieve the current property | |
258 | * value this might be out of sync with the hardware, depending upon the driver | |
259 | * and property. | |
260 | * | |
a2511a55 DV |
261 | * Atomic drivers should never call this function directly, the core will read |
262 | * out property values through the various ->atomic_get_property callbacks. | |
263 | * | |
949619f3 DV |
264 | * Returns: |
265 | * Zero on success, error code on failure. | |
266 | */ | |
267 | int drm_object_property_get_value(struct drm_mode_object *obj, | |
268 | struct drm_property *property, uint64_t *val) | |
269 | { | |
270 | int i; | |
271 | ||
272 | /* read-only properties bypass atomic mechanism and still store | |
273 | * their value in obj->properties->values[].. mostly to avoid | |
274 | * having to deal w/ EDID and similar props in atomic paths: | |
275 | */ | |
276 | if (drm_core_check_feature(property->dev, DRIVER_ATOMIC) && | |
277 | !(property->flags & DRM_MODE_PROP_IMMUTABLE)) | |
278 | return drm_atomic_get_property(obj, property, val); | |
279 | ||
280 | for (i = 0; i < obj->properties->count; i++) { | |
281 | if (obj->properties->properties[i] == property) { | |
282 | *val = obj->properties->values[i]; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | } | |
287 | ||
288 | return -EINVAL; | |
289 | } | |
290 | EXPORT_SYMBOL(drm_object_property_get_value); | |
291 | ||
292 | /* helper for getconnector and getproperties ioctls */ | |
293 | int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, | |
294 | uint32_t __user *prop_ptr, | |
295 | uint64_t __user *prop_values, | |
296 | uint32_t *arg_count_props) | |
297 | { | |
f094d881 | 298 | int i, ret, count; |
949619f3 | 299 | |
f094d881 DV |
300 | for (i = 0, count = 0; i < obj->properties->count; i++) { |
301 | struct drm_property *prop = obj->properties->properties[i]; | |
302 | uint64_t val; | |
949619f3 | 303 | |
f094d881 DV |
304 | if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic) |
305 | continue; | |
949619f3 | 306 | |
f094d881 | 307 | if (*arg_count_props > count) { |
949619f3 DV |
308 | ret = drm_object_property_get_value(obj, prop, &val); |
309 | if (ret) | |
310 | return ret; | |
311 | ||
f094d881 | 312 | if (put_user(prop->base.id, prop_ptr + count)) |
949619f3 DV |
313 | return -EFAULT; |
314 | ||
f094d881 | 315 | if (put_user(val, prop_values + count)) |
949619f3 | 316 | return -EFAULT; |
949619f3 | 317 | } |
f094d881 DV |
318 | |
319 | count++; | |
949619f3 | 320 | } |
f094d881 | 321 | *arg_count_props = count; |
949619f3 DV |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /** | |
327 | * drm_mode_obj_get_properties_ioctl - get the current value of a object's property | |
328 | * @dev: DRM device | |
329 | * @data: ioctl data | |
330 | * @file_priv: DRM file info | |
331 | * | |
332 | * This function retrieves the current value for an object's property. Compared | |
333 | * to the connector specific ioctl this one is extended to also work on crtc and | |
334 | * plane objects. | |
335 | * | |
336 | * Called by the user via ioctl. | |
337 | * | |
338 | * Returns: | |
339 | * Zero on success, negative errno on failure. | |
340 | */ | |
341 | int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data, | |
342 | struct drm_file *file_priv) | |
343 | { | |
344 | struct drm_mode_obj_get_properties *arg = data; | |
345 | struct drm_mode_object *obj; | |
346 | int ret = 0; | |
347 | ||
348 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
349 | return -EINVAL; | |
350 | ||
351 | drm_modeset_lock_all(dev); | |
352 | ||
353 | obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type); | |
354 | if (!obj) { | |
355 | ret = -ENOENT; | |
356 | goto out; | |
357 | } | |
358 | if (!obj->properties) { | |
359 | ret = -EINVAL; | |
360 | goto out_unref; | |
361 | } | |
362 | ||
363 | ret = drm_mode_object_get_properties(obj, file_priv->atomic, | |
364 | (uint32_t __user *)(unsigned long)(arg->props_ptr), | |
365 | (uint64_t __user *)(unsigned long)(arg->prop_values_ptr), | |
366 | &arg->count_props); | |
367 | ||
368 | out_unref: | |
369 | drm_mode_object_unreference(obj); | |
370 | out: | |
371 | drm_modeset_unlock_all(dev); | |
372 | return ret; | |
373 | } | |
374 | ||
f92f053b ML |
375 | struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj, |
376 | uint32_t prop_id) | |
377 | { | |
378 | int i; | |
379 | ||
380 | for (i = 0; i < obj->properties->count; i++) | |
381 | if (obj->properties->properties[i]->base.id == prop_id) | |
382 | return obj->properties->properties[i]; | |
383 | ||
384 | return NULL; | |
385 | } | |
386 | ||
949619f3 DV |
387 | int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data, |
388 | struct drm_file *file_priv) | |
389 | { | |
390 | struct drm_mode_obj_set_property *arg = data; | |
391 | struct drm_mode_object *arg_obj; | |
949619f3 | 392 | struct drm_property *property; |
f92f053b | 393 | int ret = -EINVAL; |
949619f3 DV |
394 | struct drm_mode_object *ref; |
395 | ||
396 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
397 | return -EINVAL; | |
398 | ||
399 | drm_modeset_lock_all(dev); | |
400 | ||
401 | arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type); | |
402 | if (!arg_obj) { | |
403 | ret = -ENOENT; | |
404 | goto out; | |
405 | } | |
949619f3 | 406 | |
f92f053b | 407 | if (!arg_obj->properties) |
949619f3 DV |
408 | goto out_unref; |
409 | ||
f92f053b ML |
410 | property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id); |
411 | if (!property) | |
949619f3 | 412 | goto out_unref; |
949619f3 DV |
413 | |
414 | if (!drm_property_change_valid_get(property, arg->value, &ref)) | |
415 | goto out_unref; | |
416 | ||
417 | switch (arg_obj->type) { | |
418 | case DRM_MODE_OBJECT_CONNECTOR: | |
419 | ret = drm_mode_connector_set_obj_prop(arg_obj, property, | |
420 | arg->value); | |
421 | break; | |
422 | case DRM_MODE_OBJECT_CRTC: | |
423 | ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value); | |
424 | break; | |
425 | case DRM_MODE_OBJECT_PLANE: | |
426 | ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj), | |
427 | property, arg->value); | |
428 | break; | |
429 | } | |
430 | ||
431 | drm_property_change_valid_put(property, ref); | |
432 | ||
433 | out_unref: | |
434 | drm_mode_object_unreference(arg_obj); | |
435 | out: | |
436 | drm_modeset_unlock_all(dev); | |
437 | return ret; | |
438 | } |