1/**
2 * \file drm_ioctl.c
3 * IOCTL processing for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
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:
22 *
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
25 * Software.
26 *
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.
34 */
35
36#include <sys/cdefs.h>
37#include <dev/drm2/drmP.h>
38#include <dev/drm2/drm_core.h>
39
40/**
41 * Get the bus id.
42 *
43 * \param inode device inode.
44 * \param file_priv DRM file private.
45 * \param cmd command.
46 * \param arg user argument, pointing to a drm_unique structure.
47 * \return zero on success or a negative number on failure.
48 *
49 * Copies the bus id from drm_device::unique into user space.
50 */
51int drm_getunique(struct drm_device *dev, void *data,
52		  struct drm_file *file_priv)
53{
54	struct drm_unique *u = data;
55	struct drm_master *master = file_priv->master;
56
57	if (u->unique_len >= master->unique_len) {
58		if (copy_to_user(u->unique, master->unique, master->unique_len))
59			return -EFAULT;
60	}
61	u->unique_len = master->unique_len;
62
63	return 0;
64}
65
66static void
67drm_unset_busid(struct drm_device *dev,
68		struct drm_master *master)
69{
70
71	free(master->unique, DRM_MEM_DRIVER);
72	master->unique = NULL;
73	master->unique_len = 0;
74	master->unique_size = 0;
75}
76
77/**
78 * Set the bus id.
79 *
80 * \param inode device inode.
81 * \param file_priv DRM file private.
82 * \param cmd command.
83 * \param arg user argument, pointing to a drm_unique structure.
84 * \return zero on success or a negative number on failure.
85 *
86 * Copies the bus id from userspace into drm_device::unique, and verifies that
87 * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
88 * in interface version 1.1 and will return EBUSY when setversion has requested
89 * version 1.1 or greater.
90 */
91int drm_setunique(struct drm_device *dev, void *data,
92		  struct drm_file *file_priv)
93{
94	struct drm_unique *u = data;
95	struct drm_master *master = file_priv->master;
96	int ret;
97
98	if (master->unique_len || master->unique)
99		return -EBUSY;
100
101	if (!u->unique_len || u->unique_len > 1024)
102		return -EINVAL;
103
104	if (!dev->driver->bus->set_unique)
105		return -EINVAL;
106
107	ret = dev->driver->bus->set_unique(dev, master, u);
108	if (ret)
109		goto err;
110
111	return 0;
112
113err:
114	drm_unset_busid(dev, master);
115	return ret;
116}
117
118static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
119{
120	struct drm_master *master = file_priv->master;
121	int ret;
122
123	if (master->unique != NULL)
124		drm_unset_busid(dev, master);
125
126	ret = dev->driver->bus->set_busid(dev, master);
127	if (ret)
128		goto err;
129	return 0;
130err:
131	drm_unset_busid(dev, master);
132	return ret;
133}
134
135/**
136 * Get a mapping information.
137 *
138 * \param inode device inode.
139 * \param file_priv DRM file private.
140 * \param cmd command.
141 * \param arg user argument, pointing to a drm_map structure.
142 *
143 * \return zero on success or a negative number on failure.
144 *
145 * Searches for the mapping with the specified offset and copies its information
146 * into userspace
147 */
148int drm_getmap(struct drm_device *dev, void *data,
149	       struct drm_file *file_priv)
150{
151	struct drm_map *map = data;
152	struct drm_map_list *r_list = NULL;
153	struct list_head *list;
154	int idx;
155	int i;
156
157	idx = map->offset;
158	if (idx < 0)
159		return -EINVAL;
160
161	i = 0;
162	DRM_LOCK(dev);
163	list_for_each(list, &dev->maplist) {
164		if (i == idx) {
165			r_list = list_entry(list, struct drm_map_list, head);
166			break;
167		}
168		i++;
169	}
170	if (!r_list || !r_list->map) {
171		DRM_UNLOCK(dev);
172		return -EINVAL;
173	}
174
175	map->offset = r_list->map->offset;
176	map->size = r_list->map->size;
177	map->type = r_list->map->type;
178	map->flags = r_list->map->flags;
179	map->handle = (void *)(unsigned long) r_list->user_token;
180	map->mtrr = r_list->map->mtrr;
181	DRM_UNLOCK(dev);
182
183	return 0;
184}
185
186/**
187 * Get client information.
188 *
189 * \param inode device inode.
190 * \param file_priv DRM file private.
191 * \param cmd command.
192 * \param arg user argument, pointing to a drm_client structure.
193 *
194 * \return zero on success or a negative number on failure.
195 *
196 * Searches for the client with the specified index and copies its information
197 * into userspace
198 */
199int drm_getclient(struct drm_device *dev, void *data,
200		  struct drm_file *file_priv)
201{
202	struct drm_client *client = data;
203	struct drm_file *pt;
204	int idx;
205	int i;
206
207	idx = client->idx;
208	i = 0;
209
210	DRM_LOCK(dev);
211	list_for_each_entry(pt, &dev->filelist, lhead) {
212		if (i++ >= idx) {
213			client->auth = pt->authenticated;
214			client->pid = pt->pid;
215			client->uid = pt->uid;
216			client->magic = pt->magic;
217			client->iocs = pt->ioctl_count;
218			DRM_UNLOCK(dev);
219
220			return 0;
221		}
222	}
223	DRM_UNLOCK(dev);
224
225	return -EINVAL;
226}
227
228/**
229 * Get statistics information.
230 *
231 * \param inode device inode.
232 * \param file_priv DRM file private.
233 * \param cmd command.
234 * \param arg user argument, pointing to a drm_stats structure.
235 *
236 * \return zero on success or a negative number on failure.
237 */
238int drm_getstats(struct drm_device *dev, void *data,
239		 struct drm_file *file_priv)
240{
241	struct drm_stats *stats = data;
242	int i;
243
244	memset(stats, 0, sizeof(*stats));
245
246	for (i = 0; i < dev->counters; i++) {
247		if (dev->types[i] == _DRM_STAT_LOCK)
248			stats->data[i].value =
249			    (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
250		else
251			stats->data[i].value = atomic_read(&dev->counts[i]);
252		stats->data[i].type = dev->types[i];
253	}
254
255	stats->count = dev->counters;
256
257	return 0;
258}
259
260/**
261 * Get device/driver capabilities
262 */
263int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
264{
265	struct drm_get_cap *req = data;
266
267	req->value = 0;
268	switch (req->capability) {
269	case DRM_CAP_DUMB_BUFFER:
270		if (dev->driver->dumb_create)
271			req->value = 1;
272		break;
273	case DRM_CAP_VBLANK_HIGH_CRTC:
274		req->value = 1;
275		break;
276	case DRM_CAP_DUMB_PREFERRED_DEPTH:
277		req->value = dev->mode_config.preferred_depth;
278		break;
279	case DRM_CAP_DUMB_PREFER_SHADOW:
280		req->value = dev->mode_config.prefer_shadow;
281		break;
282	case DRM_CAP_PRIME:
283		req->value |= false /* XXXKIB dev->driver->prime_fd_to_handle */ ? DRM_PRIME_CAP_IMPORT : 0;
284		req->value |= false /* XXXKIB dev->driver->prime_handle_to_fd */ ? DRM_PRIME_CAP_EXPORT : 0;
285		break;
286	case DRM_CAP_TIMESTAMP_MONOTONIC:
287		req->value = drm_timestamp_monotonic;
288		break;
289	default:
290		return -EINVAL;
291	}
292	return 0;
293}
294
295/**
296 * Setversion ioctl.
297 *
298 * \param inode device inode.
299 * \param file_priv DRM file private.
300 * \param cmd command.
301 * \param arg user argument, pointing to a drm_lock structure.
302 * \return zero on success or negative number on failure.
303 *
304 * Sets the requested interface version
305 */
306int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
307{
308	struct drm_set_version *sv = data;
309	int if_version, retcode = 0;
310
311	if (sv->drm_di_major != -1) {
312		if (sv->drm_di_major != DRM_IF_MAJOR ||
313		    sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
314			retcode = -EINVAL;
315			goto done;
316		}
317		if_version = DRM_IF_VERSION(sv->drm_di_major,
318					    sv->drm_di_minor);
319		dev->if_version = max(if_version, dev->if_version);
320		if (sv->drm_di_minor >= 1) {
321			/*
322			 * Version 1.1 includes tying of DRM to specific device
323			 * Version 1.4 has proper PCI domain support
324			 */
325			retcode = drm_set_busid(dev, file_priv);
326			if (retcode)
327				goto done;
328		}
329	}
330
331	if (sv->drm_dd_major != -1) {
332		if (sv->drm_dd_major != dev->driver->major ||
333		    sv->drm_dd_minor < 0 || sv->drm_dd_minor >
334		    dev->driver->minor) {
335			retcode = -EINVAL;
336			goto done;
337		}
338
339		if (dev->driver->set_version)
340			dev->driver->set_version(dev, sv);
341	}
342
343done:
344	sv->drm_di_major = DRM_IF_MAJOR;
345	sv->drm_di_minor = DRM_IF_MINOR;
346	sv->drm_dd_major = dev->driver->major;
347	sv->drm_dd_minor = dev->driver->minor;
348
349	return retcode;
350}
351
352/** No-op ioctl. */
353int drm_noop(struct drm_device *dev, void *data,
354	     struct drm_file *file_priv)
355{
356	DRM_DEBUG("\n");
357	return 0;
358}
359EXPORT_SYMBOL(drm_noop);
360