3 * IOCTL processing for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
37 #include <drm/drm_core.h>
39 #include <linux/pci.h>
40 #include <linux/export.h>
48 * \param inode device inode.
49 * \param file_priv DRM file private.
51 * \param arg user argument, pointing to a drm_unique structure.
52 * \return zero on success or a negative number on failure.
54 * Copies the bus id from drm_device::unique into user space.
56 int drm_getunique(struct drm_device *dev, void *data,
57 struct drm_file *file_priv)
59 struct drm_unique *u = data;
60 struct drm_master *master = file_priv->master;
62 if (u->unique_len >= master->unique_len) {
63 if (copy_to_user(u->unique, master->unique, master->unique_len))
66 u->unique_len = master->unique_len;
72 drm_unset_busid(struct drm_device *dev,
73 struct drm_master *master)
78 kfree(master->unique);
79 master->unique = NULL;
80 master->unique_len = 0;
81 master->unique_size = 0;
87 * \param inode device inode.
88 * \param file_priv DRM file private.
90 * \param arg user argument, pointing to a drm_unique structure.
91 * \return zero on success or a negative number on failure.
93 * Copies the bus id from userspace into drm_device::unique, and verifies that
94 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
95 * in interface version 1.1 and will return EBUSY when setversion has requested
96 * version 1.1 or greater.
98 int drm_setunique(struct drm_device *dev, void *data,
99 struct drm_file *file_priv)
101 struct drm_unique *u = data;
102 struct drm_master *master = file_priv->master;
105 if (master->unique_len || master->unique)
108 if (!u->unique_len || u->unique_len > 1024)
111 if (!dev->driver->bus->set_unique)
114 ret = dev->driver->bus->set_unique(dev, master, u);
121 drm_unset_busid(dev, master);
125 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
127 struct drm_master *master = file_priv->master;
130 if (master->unique != NULL)
131 drm_unset_busid(dev, master);
133 ret = dev->driver->bus->set_busid(dev, master);
138 drm_unset_busid(dev, master);
143 * Get a mapping information.
145 * \param inode device inode.
146 * \param file_priv DRM file private.
147 * \param cmd command.
148 * \param arg user argument, pointing to a drm_map structure.
150 * \return zero on success or a negative number on failure.
152 * Searches for the mapping with the specified offset and copies its information
155 int drm_getmap(struct drm_device *dev, void *data,
156 struct drm_file *file_priv)
158 struct drm_map *map = data;
159 struct drm_map_list *r_list = NULL;
160 struct list_head *list;
169 mutex_lock(&dev->struct_mutex);
170 list_for_each(list, &dev->maplist) {
172 r_list = list_entry(list, struct drm_map_list, head);
177 if (!r_list || !r_list->map) {
178 mutex_unlock(&dev->struct_mutex);
182 map->offset = r_list->map->offset;
183 map->size = r_list->map->size;
184 map->type = r_list->map->type;
185 map->flags = r_list->map->flags;
186 map->handle = (void *)(unsigned long) r_list->user_token;
190 * There appears to be exactly one user of the mtrr index: dritest.
191 * It's easy enough to keep it working on non-PAT systems.
193 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
198 mutex_unlock(&dev->struct_mutex);
204 * Get client information.
206 * \param inode device inode.
207 * \param file_priv DRM file private.
208 * \param cmd command.
209 * \param arg user argument, pointing to a drm_client structure.
211 * \return zero on success or a negative number on failure.
213 * Searches for the client with the specified index and copies its information
216 int drm_getclient(struct drm_device *dev, void *data,
217 struct drm_file *file_priv)
219 struct drm_client *client = data;
222 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
223 * not breaking completely. Userspace tools stop enumerating one they
224 * get -EINVAL, hence this is the return value we need to hand back for
225 * no clients tracked.
227 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
228 * attempt to figure out whether they're authenticated or not. Since
229 * that's the only thing they care about, give it to the directly
230 * instead of walking one giant list.
232 if (client->idx == 0) {
233 client->auth = file_priv->authenticated;
234 client->pid = pid_vnr(file_priv->pid);
235 client->uid = from_kuid_munged(current_user_ns(),
247 * Get statistics information.
249 * \param inode device inode.
250 * \param file_priv DRM file private.
251 * \param cmd command.
252 * \param arg user argument, pointing to a drm_stats structure.
254 * \return zero on success or a negative number on failure.
256 int drm_getstats(struct drm_device *dev, void *data,
257 struct drm_file *file_priv)
259 struct drm_stats *stats = data;
261 /* Clear stats to prevent userspace from eating its stack garbage. */
262 memset(stats, 0, sizeof(*stats));
268 * Get device/driver capabilities
270 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
272 struct drm_get_cap *req = data;
275 switch (req->capability) {
276 case DRM_CAP_DUMB_BUFFER:
277 if (dev->driver->dumb_create)
280 case DRM_CAP_VBLANK_HIGH_CRTC:
283 case DRM_CAP_DUMB_PREFERRED_DEPTH:
284 req->value = dev->mode_config.preferred_depth;
286 case DRM_CAP_DUMB_PREFER_SHADOW:
287 req->value = dev->mode_config.prefer_shadow;
290 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
291 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
293 case DRM_CAP_TIMESTAMP_MONOTONIC:
294 req->value = drm_timestamp_monotonic;
296 case DRM_CAP_ASYNC_PAGE_FLIP:
297 req->value = dev->mode_config.async_page_flip;
299 case DRM_CAP_CURSOR_WIDTH:
300 if (dev->mode_config.cursor_width)
301 req->value = dev->mode_config.cursor_width;
305 case DRM_CAP_CURSOR_HEIGHT:
306 if (dev->mode_config.cursor_height)
307 req->value = dev->mode_config.cursor_height;
318 * Set device/driver capabilities
321 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
323 struct drm_set_client_cap *req = data;
325 switch (req->capability) {
326 case DRM_CLIENT_CAP_STEREO_3D:
329 file_priv->stereo_allowed = req->value;
331 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
332 if (!drm_universal_planes)
336 file_priv->universal_planes = req->value;
348 * \param inode device inode.
349 * \param file_priv DRM file private.
350 * \param cmd command.
351 * \param arg user argument, pointing to a drm_lock structure.
352 * \return zero on success or negative number on failure.
354 * Sets the requested interface version
356 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
358 struct drm_set_version *sv = data;
359 int if_version, retcode = 0;
361 if (sv->drm_di_major != -1) {
362 if (sv->drm_di_major != DRM_IF_MAJOR ||
363 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
367 if_version = DRM_IF_VERSION(sv->drm_di_major,
369 dev->if_version = max(if_version, dev->if_version);
370 if (sv->drm_di_minor >= 1) {
372 * Version 1.1 includes tying of DRM to specific device
373 * Version 1.4 has proper PCI domain support
375 retcode = drm_set_busid(dev, file_priv);
381 if (sv->drm_dd_major != -1) {
382 if (sv->drm_dd_major != dev->driver->major ||
383 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
384 dev->driver->minor) {
391 sv->drm_di_major = DRM_IF_MAJOR;
392 sv->drm_di_minor = DRM_IF_MINOR;
393 sv->drm_dd_major = dev->driver->major;
394 sv->drm_dd_minor = dev->driver->minor;
400 int drm_noop(struct drm_device *dev, void *data,
401 struct drm_file *file_priv)
406 EXPORT_SYMBOL(drm_noop);