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
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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)
75 kfree(master->unique);
76 master->unique = NULL;
77 master->unique_len = 0;
78 master->unique_size = 0;
84 * \param inode device inode.
85 * \param file_priv DRM file private.
87 * \param arg user argument, pointing to a drm_unique structure.
88 * \return zero on success or a negative number on failure.
90 * Copies the bus id from userspace into drm_device::unique, and verifies that
91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
92 * in interface version 1.1 and will return EBUSY when setversion has requested
93 * version 1.1 or greater.
95 int drm_setunique(struct drm_device *dev, void *data,
96 struct drm_file *file_priv)
98 struct drm_unique *u = data;
99 struct drm_master *master = file_priv->master;
102 if (master->unique_len || master->unique)
105 if (!u->unique_len || u->unique_len > 1024)
108 if (!dev->driver->bus->set_unique)
111 ret = dev->driver->bus->set_unique(dev, master, u);
118 drm_unset_busid(dev, master);
122 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
124 struct drm_master *master = file_priv->master;
127 if (master->unique != NULL)
128 drm_unset_busid(dev, master);
130 ret = dev->driver->bus->set_busid(dev, master);
135 drm_unset_busid(dev, master);
140 * Get a mapping information.
142 * \param inode device inode.
143 * \param file_priv DRM file private.
144 * \param cmd command.
145 * \param arg user argument, pointing to a drm_map structure.
147 * \return zero on success or a negative number on failure.
149 * Searches for the mapping with the specified offset and copies its information
152 int drm_getmap(struct drm_device *dev, void *data,
153 struct drm_file *file_priv)
155 struct drm_map *map = data;
156 struct drm_map_list *r_list = NULL;
157 struct list_head *list;
166 mutex_lock(&dev->struct_mutex);
167 list_for_each(list, &dev->maplist) {
169 r_list = list_entry(list, struct drm_map_list, head);
174 if (!r_list || !r_list->map) {
175 mutex_unlock(&dev->struct_mutex);
179 map->offset = r_list->map->offset;
180 map->size = r_list->map->size;
181 map->type = r_list->map->type;
182 map->flags = r_list->map->flags;
183 map->handle = (void *)(unsigned long) r_list->user_token;
187 * There appears to be exactly one user of the mtrr index: dritest.
188 * It's easy enough to keep it working on non-PAT systems.
190 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
195 mutex_unlock(&dev->struct_mutex);
201 * Get client information.
203 * \param inode device inode.
204 * \param file_priv DRM file private.
205 * \param cmd command.
206 * \param arg user argument, pointing to a drm_client structure.
208 * \return zero on success or a negative number on failure.
210 * Searches for the client with the specified index and copies its information
213 int drm_getclient(struct drm_device *dev, void *data,
214 struct drm_file *file_priv)
216 struct drm_client *client = data;
219 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
220 * not breaking completely. Userspace tools stop enumerating one they
221 * get -EINVAL, hence this is the return value we need to hand back for
222 * no clients tracked.
224 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
225 * attempt to figure out whether they're authenticated or not. Since
226 * that's the only thing they care about, give it to the directly
227 * instead of walking one giant list.
229 if (client->idx == 0) {
230 client->auth = file_priv->authenticated;
231 client->pid = pid_vnr(file_priv->pid);
232 client->uid = from_kuid_munged(current_user_ns(),
244 * Get statistics information.
246 * \param inode device inode.
247 * \param file_priv DRM file private.
248 * \param cmd command.
249 * \param arg user argument, pointing to a drm_stats structure.
251 * \return zero on success or a negative number on failure.
253 int drm_getstats(struct drm_device *dev, void *data,
254 struct drm_file *file_priv)
256 struct drm_stats *stats = data;
258 /* Clear stats to prevent userspace from eating its stack garbage. */
259 memset(stats, 0, sizeof(*stats));
265 * Get device/driver capabilities
267 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
269 struct drm_get_cap *req = data;
272 switch (req->capability) {
273 case DRM_CAP_DUMB_BUFFER:
274 if (dev->driver->dumb_create)
277 case DRM_CAP_VBLANK_HIGH_CRTC:
280 case DRM_CAP_DUMB_PREFERRED_DEPTH:
281 req->value = dev->mode_config.preferred_depth;
283 case DRM_CAP_DUMB_PREFER_SHADOW:
284 req->value = dev->mode_config.prefer_shadow;
287 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
288 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
290 case DRM_CAP_TIMESTAMP_MONOTONIC:
291 req->value = drm_timestamp_monotonic;
293 case DRM_CAP_ASYNC_PAGE_FLIP:
294 req->value = dev->mode_config.async_page_flip;
296 case DRM_CAP_CURSOR_WIDTH:
297 if (dev->mode_config.cursor_width)
298 req->value = dev->mode_config.cursor_width;
302 case DRM_CAP_CURSOR_HEIGHT:
303 if (dev->mode_config.cursor_height)
304 req->value = dev->mode_config.cursor_height;
315 * Set device/driver capabilities
318 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
320 struct drm_set_client_cap *req = data;
322 switch (req->capability) {
323 case DRM_CLIENT_CAP_STEREO_3D:
326 file_priv->stereo_allowed = req->value;
338 * \param inode device inode.
339 * \param file_priv DRM file private.
340 * \param cmd command.
341 * \param arg user argument, pointing to a drm_lock structure.
342 * \return zero on success or negative number on failure.
344 * Sets the requested interface version
346 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
348 struct drm_set_version *sv = data;
349 int if_version, retcode = 0;
351 if (sv->drm_di_major != -1) {
352 if (sv->drm_di_major != DRM_IF_MAJOR ||
353 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
357 if_version = DRM_IF_VERSION(sv->drm_di_major,
359 dev->if_version = max(if_version, dev->if_version);
360 if (sv->drm_di_minor >= 1) {
362 * Version 1.1 includes tying of DRM to specific device
363 * Version 1.4 has proper PCI domain support
365 retcode = drm_set_busid(dev, file_priv);
371 if (sv->drm_dd_major != -1) {
372 if (sv->drm_dd_major != dev->driver->major ||
373 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
374 dev->driver->minor) {
381 sv->drm_di_major = DRM_IF_MAJOR;
382 sv->drm_di_minor = DRM_IF_MINOR;
383 sv->drm_dd_major = dev->driver->major;
384 sv->drm_dd_minor = dev->driver->minor;
390 int drm_noop(struct drm_device *dev, void *data,
391 struct drm_file *file_priv)
396 EXPORT_SYMBOL(drm_noop);