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
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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. Also note that KMS is all version 1.1 and later and
94 * UMS was only ever supported on pci devices.
96 int drm_setunique(struct drm_device *dev, void *data,
97 struct drm_file *file_priv)
99 struct drm_unique *u = data;
100 struct drm_master *master = file_priv->master;
103 if (master->unique_len || master->unique)
106 if (!u->unique_len || u->unique_len > 1024)
109 if (drm_core_check_feature(dev, DRIVER_MODESET))
112 if (WARN_ON(!dev->pdev))
115 ret = drm_pci_set_unique(dev, master, u);
122 drm_unset_busid(dev, master);
126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
128 struct drm_master *master = file_priv->master;
131 if (master->unique != NULL)
132 drm_unset_busid(dev, master);
134 if (dev->driver->bus && dev->driver->bus->set_busid) {
135 ret = dev->driver->bus->set_busid(dev, master);
137 drm_unset_busid(dev, master);
141 if (WARN(dev->unique == NULL,
142 "No drm_bus.set_busid() implementation provided by "
143 "%ps. Use drm_dev_set_unique() to set the unique "
144 "name explicitly.", dev->driver))
147 master->unique = kstrdup(dev->unique, GFP_KERNEL);
149 master->unique_len = strlen(dev->unique);
156 * Get a mapping information.
158 * \param inode device inode.
159 * \param file_priv DRM file private.
160 * \param cmd command.
161 * \param arg user argument, pointing to a drm_map structure.
163 * \return zero on success or a negative number on failure.
165 * Searches for the mapping with the specified offset and copies its information
168 int drm_getmap(struct drm_device *dev, void *data,
169 struct drm_file *file_priv)
171 struct drm_map *map = data;
172 struct drm_map_list *r_list = NULL;
173 struct list_head *list;
182 mutex_lock(&dev->struct_mutex);
183 list_for_each(list, &dev->maplist) {
185 r_list = list_entry(list, struct drm_map_list, head);
190 if (!r_list || !r_list->map) {
191 mutex_unlock(&dev->struct_mutex);
195 map->offset = r_list->map->offset;
196 map->size = r_list->map->size;
197 map->type = r_list->map->type;
198 map->flags = r_list->map->flags;
199 map->handle = (void *)(unsigned long) r_list->user_token;
203 * There appears to be exactly one user of the mtrr index: dritest.
204 * It's easy enough to keep it working on non-PAT systems.
206 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
211 mutex_unlock(&dev->struct_mutex);
217 * Get client information.
219 * \param inode device inode.
220 * \param file_priv DRM file private.
221 * \param cmd command.
222 * \param arg user argument, pointing to a drm_client structure.
224 * \return zero on success or a negative number on failure.
226 * Searches for the client with the specified index and copies its information
229 int drm_getclient(struct drm_device *dev, void *data,
230 struct drm_file *file_priv)
232 struct drm_client *client = data;
235 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
236 * not breaking completely. Userspace tools stop enumerating one they
237 * get -EINVAL, hence this is the return value we need to hand back for
238 * no clients tracked.
240 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
241 * attempt to figure out whether they're authenticated or not. Since
242 * that's the only thing they care about, give it to the directly
243 * instead of walking one giant list.
245 if (client->idx == 0) {
246 client->auth = file_priv->authenticated;
247 client->pid = pid_vnr(file_priv->pid);
248 client->uid = from_kuid_munged(current_user_ns(),
260 * Get statistics information.
262 * \param inode device inode.
263 * \param file_priv DRM file private.
264 * \param cmd command.
265 * \param arg user argument, pointing to a drm_stats structure.
267 * \return zero on success or a negative number on failure.
269 int drm_getstats(struct drm_device *dev, void *data,
270 struct drm_file *file_priv)
272 struct drm_stats *stats = data;
274 /* Clear stats to prevent userspace from eating its stack garbage. */
275 memset(stats, 0, sizeof(*stats));
281 * Get device/driver capabilities
283 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
285 struct drm_get_cap *req = data;
288 switch (req->capability) {
289 case DRM_CAP_DUMB_BUFFER:
290 if (dev->driver->dumb_create)
293 case DRM_CAP_VBLANK_HIGH_CRTC:
296 case DRM_CAP_DUMB_PREFERRED_DEPTH:
297 req->value = dev->mode_config.preferred_depth;
299 case DRM_CAP_DUMB_PREFER_SHADOW:
300 req->value = dev->mode_config.prefer_shadow;
303 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
304 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
306 case DRM_CAP_TIMESTAMP_MONOTONIC:
307 req->value = drm_timestamp_monotonic;
309 case DRM_CAP_ASYNC_PAGE_FLIP:
310 req->value = dev->mode_config.async_page_flip;
312 case DRM_CAP_CURSOR_WIDTH:
313 if (dev->mode_config.cursor_width)
314 req->value = dev->mode_config.cursor_width;
318 case DRM_CAP_CURSOR_HEIGHT:
319 if (dev->mode_config.cursor_height)
320 req->value = dev->mode_config.cursor_height;
331 * Set device/driver capabilities
334 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
336 struct drm_set_client_cap *req = data;
338 switch (req->capability) {
339 case DRM_CLIENT_CAP_STEREO_3D:
342 file_priv->stereo_allowed = req->value;
344 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
345 if (!drm_universal_planes)
349 file_priv->universal_planes = req->value;
361 * \param inode device inode.
362 * \param file_priv DRM file private.
363 * \param cmd command.
364 * \param arg user argument, pointing to a drm_lock structure.
365 * \return zero on success or negative number on failure.
367 * Sets the requested interface version
369 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
371 struct drm_set_version *sv = data;
372 int if_version, retcode = 0;
374 if (sv->drm_di_major != -1) {
375 if (sv->drm_di_major != DRM_IF_MAJOR ||
376 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
380 if_version = DRM_IF_VERSION(sv->drm_di_major,
382 dev->if_version = max(if_version, dev->if_version);
383 if (sv->drm_di_minor >= 1) {
385 * Version 1.1 includes tying of DRM to specific device
386 * Version 1.4 has proper PCI domain support
388 retcode = drm_set_busid(dev, file_priv);
394 if (sv->drm_dd_major != -1) {
395 if (sv->drm_dd_major != dev->driver->major ||
396 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
397 dev->driver->minor) {
404 sv->drm_di_major = DRM_IF_MAJOR;
405 sv->drm_di_minor = DRM_IF_MINOR;
406 sv->drm_dd_major = dev->driver->major;
407 sv->drm_dd_minor = dev->driver->minor;
413 int drm_noop(struct drm_device *dev, void *data,
414 struct drm_file *file_priv)
419 EXPORT_SYMBOL(drm_noop);