drivers/gpu/drm/drm_mode_object.c

   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 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
 108                                                uint32_t id, uint32_t type)
 109 {
 110         struct drm_mode_object *obj = NULL;
 111
 112         mutex_lock(&dev->mode_config.idr_mutex);
 113         obj = idr_find(&dev->mode_config.crtc_idr, id);
 114         if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
 115                 obj = NULL;
 116         if (obj && obj->id != id)
 117                 obj = NULL;
 118
 119         if (obj && obj->free_cb) {
 120                 if (!kref_get_unless_zero(&obj->refcount))
 121                         obj = NULL;
 122         }
 123         mutex_unlock(&dev->mode_config.idr_mutex);
 124
 125         return obj;
 126 }
 127
 128 /**
 129  * drm_mode_object_find - look up a drm object with static lifetime
 130  * @dev: drm device
 131  * @id: id of the mode object
 132  * @type: type of the mode object
 133  *
 134  * This function is used to look up a modeset object. It will acquire a
 135  * reference for reference counted objects. This reference must be dropped again
 136  * by callind drm_mode_object_put().
 137  */
 138 struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 139                 uint32_t id, uint32_t type)
 140 {
 141         struct drm_mode_object *obj = NULL;
 142
 143         obj = __drm_mode_object_find(dev, id, type);
 144         return obj;
 145 }
 146 EXPORT_SYMBOL(drm_mode_object_find);
 147
 148 /**
 149  * drm_mode_object_put - release a mode object reference
 150  * @obj: DRM mode object
 151  *
 152  * This function decrements the object's refcount if it is a refcounted modeset
 153  * object. It is a no-op on any other object. This is used to drop references
 154  * acquired with drm_mode_object_get().
 155  */
 156 void drm_mode_object_put(struct drm_mode_object *obj)
 157 {
 158         if (obj->free_cb) {
 159                 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
 160                 kref_put(&obj->refcount, obj->free_cb);
 161         }
 162 }
 163 EXPORT_SYMBOL(drm_mode_object_put);
 164
 165 /**
 166  * drm_mode_object_get - acquire a mode object reference
 167  * @obj: DRM mode object
 168  *
 169  * This function increments the object's refcount if it is a refcounted modeset
 170  * object. It is a no-op on any other object. References should be dropped again
 171  * by calling drm_mode_object_put().
 172  */
 173 void drm_mode_object_get(struct drm_mode_object *obj)
 174 {
 175         if (obj->free_cb) {
 176                 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
 177                 kref_get(&obj->refcount);
 178         }
 179 }
 180 EXPORT_SYMBOL(drm_mode_object_get);
 181
 182 /**
 183  * drm_object_attach_property - attach a property to a modeset object
 184  * @obj: drm modeset object
 185  * @property: property to attach
 186  * @init_val: initial value of the property
 187  *
 188  * This attaches the given property to the modeset object with the given initial
 189  * value. Currently this function cannot fail since the properties are stored in
 190  * a statically sized array.
 191  */
 192 void drm_object_attach_property(struct drm_mode_object *obj,
 193                                 struct drm_property *property,
 194                                 uint64_t init_val)
 195 {
 196         int count = obj->properties->count;
 197
 198         if (count == DRM_OBJECT_MAX_PROPERTY) {
 199                 WARN(1, "Failed to attach object property (type: 0x%x). Please "
 200                         "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
 201                         "you see this message on the same object type.\n",
 202                         obj->type);
 203                 return;
 204         }
 205
 206         obj->properties->properties[count] = property;
 207         obj->properties->values[count] = init_val;
 208         obj->properties->count++;
 209 }
 210 EXPORT_SYMBOL(drm_object_attach_property);
 211
 212 /**
 213  * drm_object_property_set_value - set the value of a property
 214  * @obj: drm mode object to set property value for
 215  * @property: property to set
 216  * @val: value the property should be set to
 217  *
 218  * This function sets a given property on a given object. This function only
 219  * changes the software state of the property, it does not call into the
 220  * driver's ->set_property callback.
 221  *
 222  * Note that atomic drivers should not have any need to call this, the core will
 223  * ensure consistency of values reported back to userspace through the
 224  * appropriate ->atomic_get_property callback. Only legacy drivers should call
 225  * this function to update the tracked value (after clamping and other
 226  * restrictions have been applied).
 227  *
 228  * Returns:
 229  * Zero on success, error code on failure.
 230  */
 231 int drm_object_property_set_value(struct drm_mode_object *obj,
 232                                   struct drm_property *property, uint64_t val)
 233 {
 234         int i;
 235
 236         for (i = 0; i < obj->properties->count; i++) {
 237                 if (obj->properties->properties[i] == property) {
 238                         obj->properties->values[i] = val;
 239                         return 0;
 240                 }
 241         }
 242
 243         return -EINVAL;
 244 }
 245 EXPORT_SYMBOL(drm_object_property_set_value);
 246
 247 /**
 248  * drm_object_property_get_value - retrieve the value of a property
 249  * @obj: drm mode object to get property value from
 250  * @property: property to retrieve
 251  * @val: storage for the property value
 252  *
 253  * This function retrieves the softare state of the given property for the given
 254  * property. Since there is no driver callback to retrieve the current property
 255  * value this might be out of sync with the hardware, depending upon the driver
 256  * and property.
 257  *
 258  * Atomic drivers should never call this function directly, the core will read
 259  * out property values through the various ->atomic_get_property callbacks.
 260  *
 261  * Returns:
 262  * Zero on success, error code on failure.
 263  */
 264 int drm_object_property_get_value(struct drm_mode_object *obj,
 265                                   struct drm_property *property, uint64_t *val)
 266 {
 267         int i;
 268
 269         /* read-only properties bypass atomic mechanism and still store
 270          * their value in obj->properties->values[].. mostly to avoid
 271          * having to deal w/ EDID and similar props in atomic paths:
 272          */
 273         if (drm_drv_uses_atomic_modeset(property->dev) &&
 274                         !(property->flags & DRM_MODE_PROP_IMMUTABLE))
 275                 return drm_atomic_get_property(obj, property, val);
 276
 277         for (i = 0; i < obj->properties->count; i++) {
 278                 if (obj->properties->properties[i] == property) {
 279                         *val = obj->properties->values[i];
 280                         return 0;
 281                 }
 282
 283         }
 284
 285         return -EINVAL;
 286 }
 287 EXPORT_SYMBOL(drm_object_property_get_value);
 288
 289 /* helper for getconnector and getproperties ioctls */
 290 int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
 291                                    uint32_t __user *prop_ptr,
 292                                    uint64_t __user *prop_values,
 293                                    uint32_t *arg_count_props)
 294 {
 295         int i, ret, count;
 296
 297         for (i = 0, count = 0; i < obj->properties->count; i++) {
 298                 struct drm_property *prop = obj->properties->properties[i];
 299                 uint64_t val;
 300
 301                 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
 302                         continue;
 303
 304                 if (*arg_count_props > count) {
 305                         ret = drm_object_property_get_value(obj, prop, &val);
 306                         if (ret)
 307                                 return ret;
 308
 309                         if (put_user(prop->base.id, prop_ptr + count))
 310                                 return -EFAULT;
 311
 312                         if (put_user(val, prop_values + count))
 313                                 return -EFAULT;
 314                 }
 315
 316                 count++;
 317         }
 318         *arg_count_props = count;
 319
 320         return 0;
 321 }
 322
 323 /**
 324  * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
 325  * @dev: DRM device
 326  * @data: ioctl data
 327  * @file_priv: DRM file info
 328  *
 329  * This function retrieves the current value for an object's property. Compared
 330  * to the connector specific ioctl this one is extended to also work on crtc and
 331  * plane objects.
 332  *
 333  * Called by the user via ioctl.
 334  *
 335  * Returns:
 336  * Zero on success, negative errno on failure.
 337  */
 338 int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
 339                                       struct drm_file *file_priv)
 340 {
 341         struct drm_mode_obj_get_properties *arg = data;
 342         struct drm_mode_object *obj;
 343         int ret = 0;
 344
 345         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 346                 return -EINVAL;
 347
 348         drm_modeset_lock_all(dev);
 349
 350         obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
 351         if (!obj) {
 352                 ret = -ENOENT;
 353                 goto out;
 354         }
 355         if (!obj->properties) {
 356                 ret = -EINVAL;
 357                 goto out_unref;
 358         }
 359
 360         ret = drm_mode_object_get_properties(obj, file_priv->atomic,
 361                         (uint32_t __user *)(unsigned long)(arg->props_ptr),
 362                         (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
 363                         &arg->count_props);
 364
 365 out_unref:
 366         drm_mode_object_put(obj);
 367 out:
 368         drm_modeset_unlock_all(dev);
 369         return ret;
 370 }
 371
 372 struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
 373                                                uint32_t prop_id)
 374 {
 375         int i;
 376
 377         for (i = 0; i < obj->properties->count; i++)
 378                 if (obj->properties->properties[i]->base.id == prop_id)
 379                         return obj->properties->properties[i];
 380
 381         return NULL;
 382 }
 383
 384 int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 385                                     struct drm_file *file_priv)
 386 {
 387         struct drm_mode_obj_set_property *arg = data;
 388         struct drm_mode_object *arg_obj;
 389         struct drm_property *property;
 390         int ret = -EINVAL;
 391         struct drm_mode_object *ref;
 392
 393         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 394                 return -EINVAL;
 395
 396         drm_modeset_lock_all(dev);
 397
 398         arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
 399         if (!arg_obj) {
 400                 ret = -ENOENT;
 401                 goto out;
 402         }
 403
 404         if (!arg_obj->properties)
 405                 goto out_unref;
 406
 407         property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
 408         if (!property)
 409                 goto out_unref;
 410
 411         if (!drm_property_change_valid_get(property, arg->value, &ref))
 412                 goto out_unref;
 413
 414         switch (arg_obj->type) {
 415         case DRM_MODE_OBJECT_CONNECTOR:
 416                 ret = drm_mode_connector_set_obj_prop(arg_obj, property,
 417                                                       arg->value);
 418                 break;
 419         case DRM_MODE_OBJECT_CRTC:
 420                 ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value);
 421                 break;
 422         case DRM_MODE_OBJECT_PLANE:
 423                 ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj),
 424                                                   property, arg->value);
 425                 break;
 426         }
 427
 428         drm_property_change_valid_put(property, ref);
 429
 430 out_unref:
 431         drm_mode_object_put(arg_obj);
 432 out:
 433         drm_modeset_unlock_all(dev);
 434         return ret;
 435 }