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__FBSDID("$FreeBSD$");
38
39#include <dev/drm2/drmP.h>
40#include <dev/drm2/drm_core.h>
41
42/**
43 * Get the bus id.
44 *
45 * \param inode device inode.
46 * \param file_priv DRM file private.
47 * \param cmd command.
48 * \param arg user argument, pointing to a drm_unique structure.
49 * \return zero on success or a negative number on failure.
50 *
51 * Copies the bus id from drm_device::unique into user space.
52 */
53int drm_getunique(struct drm_device *dev, void *data,
54		  struct drm_file *file_priv)
55{
56	struct drm_unique *u = data;
57	struct drm_master *master = file_priv->master;
58
59	if (u->unique_len >= master->unique_len) {
60		if (copy_to_user(u->unique, master->unique, master->unique_len))
61			return -EFAULT;
62	}
63	u->unique_len = master->unique_len;
64
65	return 0;
66}
67
68static void
69drm_unset_busid(struct drm_device *dev,
70		struct drm_master *master)
71{
72
73	free(master->unique, DRM_MEM_DRIVER);
74	master->unique = NULL;
75	master->unique_len = 0;
76	master->unique_size = 0;
77}
78
79/**
80 * Set the bus id.
81 *
82 * \param inode device inode.
83 * \param file_priv DRM file private.
84 * \param cmd command.
85 * \param arg user argument, pointing to a drm_unique structure.
86 * \return zero on success or a negative number on failure.
87 *
88 * Copies the bus id from userspace into drm_device::unique, and verifies that
89 * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
90 * in interface version 1.1 and will return EBUSY when setversion has requested
91 * version 1.1 or greater.
92 */
93int drm_setunique(struct drm_device *dev, void *data,
94		  struct drm_file *file_priv)
95{
96	struct drm_unique *u = data;
97	struct drm_master *master = file_priv->master;
98	int ret;
99
100	if (master->unique_len || master->unique)
101		return -EBUSY;
102
103	if (!u->unique_len || u->unique_len > 1024)
104		return -EINVAL;
105
106	if (!dev->driver->bus->set_unique)
107		return -EINVAL;
108
109	ret = dev->driver->bus->set_unique(dev, master, u);
110	if (ret)
111		goto err;
112
113	return 0;
114
115err:
116	drm_unset_busid(dev, master);
117	return ret;
118}
119
120static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
121{
122	struct drm_master *master = file_priv->master;
123	int ret;
124
125	if (master->unique != NULL)
126		drm_unset_busid(dev, master);
127
128	ret = dev->driver->bus->set_busid(dev, master);
129	if (ret)
130		goto err;
131	return 0;
132err:
133	drm_unset_busid(dev, master);
134	return ret;
135}
136
137/**
138 * Get a mapping information.
139 *
140 * \param inode device inode.
141 * \param file_priv DRM file private.
142 * \param cmd command.
143 * \param arg user argument, pointing to a drm_map structure.
144 *
145 * \return zero on success or a negative number on failure.
146 *
147 * Searches for the mapping with the specified offset and copies its information
148 * into userspace
149 */
150int drm_getmap(struct drm_device *dev, void *data,
151	       struct drm_file *file_priv)
152{
153	struct drm_map *map = data;
154	struct drm_map_list *r_list = NULL;
155	struct list_head *list;
156	int idx;
157	int i;
158
159	idx = map->offset;
160	if (idx < 0)
161		return -EINVAL;
162
163	i = 0;
164	DRM_LOCK(dev);
165	list_for_each(list, &dev->maplist) {
166		if (i == idx) {
167			r_list = list_entry(list, struct drm_map_list, head);
168			break;
169		}
170		i++;
171	}
172	if (!r_list || !r_list->map) {
173		DRM_UNLOCK(dev);
174		return -EINVAL;
175	}
176
177	map->offset = r_list->map->offset;
178	map->size = r_list->map->size;
179	map->type = r_list->map->type;
180	map->flags = r_list->map->flags;
181	map->handle = (void *)(unsigned long) r_list->user_token;
182	map->mtrr = r_list->map->mtrr;
183	DRM_UNLOCK(dev);
184
185	return 0;
186}
187
188/**
189 * Get client information.
190 *
191 * \param inode device inode.
192 * \param file_priv DRM file private.
193 * \param cmd command.
194 * \param arg user argument, pointing to a drm_client structure.
195 *
196 * \return zero on success or a negative number on failure.
197 *
198 * Searches for the client with the specified index and copies its information
199 * into userspace
200 */
201int drm_getclient(struct drm_device *dev, void *data,
202		  struct drm_file *file_priv)
203{
204	struct drm_client *client = data;
205	struct drm_file *pt;
206	int idx;
207	int i;
208
209	idx = client->idx;
210	i = 0;
211
212	DRM_LOCK(dev);
213	list_for_each_entry(pt, &dev->filelist, lhead) {
214		if (i++ >= idx) {
215			client->auth = pt->authenticated;
216			client->pid = pt->pid;
217			client->uid = pt->uid;
218			client->magic = pt->magic;
219			client->iocs = pt->ioctl_count;
220			DRM_UNLOCK(dev);
221
222			return 0;
223		}
224	}
225	DRM_UNLOCK(dev);
226
227	return -EINVAL;
228}
229
230/**
231 * Get statistics information.
232 *
233 * \param inode device inode.
234 * \param file_priv DRM file private.
235 * \param cmd command.
236 * \param arg user argument, pointing to a drm_stats structure.
237 *
238 * \return zero on success or a negative number on failure.
239 */
240int drm_getstats(struct drm_device *dev, void *data,
241		 struct drm_file *file_priv)
242{
243	struct drm_stats *stats = data;
244	int i;
245
246	memset(stats, 0, sizeof(*stats));
247
248	for (i = 0; i < dev->counters; i++) {
249		if (dev->types[i] == _DRM_STAT_LOCK)
250			stats->data[i].value =
251			    (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
252		else
253			stats->data[i].value = atomic_read(&dev->counts[i]);
254		stats->data[i].type = dev->types[i];
255	}
256
257	stats->count = dev->counters;
258
259	return 0;
260}
261
262/**
263 * Get device/driver capabilities
264 */
265int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
266{
267	struct drm_get_cap *req = data;
268
269	req->value = 0;
270	switch (req->capability) {
271	case DRM_CAP_DUMB_BUFFER:
272		if (dev->driver->dumb_create)
273			req->value = 1;
274		break;
275	case DRM_CAP_VBLANK_HIGH_CRTC:
276		req->value = 1;
277		break;
278	case DRM_CAP_DUMB_PREFERRED_DEPTH:
279		req->value = dev->mode_config.preferred_depth;
280		break;
281	case DRM_CAP_DUMB_PREFER_SHADOW:
282		req->value = dev->mode_config.prefer_shadow;
283		break;
284	case DRM_CAP_PRIME:
285		req->value |= false /* XXXKIB dev->driver->prime_fd_to_handle */ ? DRM_PRIME_CAP_IMPORT : 0;
286		req->value |= false /* XXXKIB dev->driver->prime_handle_to_fd */ ? DRM_PRIME_CAP_EXPORT : 0;
287		break;
288	case DRM_CAP_TIMESTAMP_MONOTONIC:
289		req->value = drm_timestamp_monotonic;
290		break;
291	default:
292		return -EINVAL;
293	}
294	return 0;
295}
296
297/**
298 * Setversion ioctl.
299 *
300 * \param inode device inode.
301 * \param file_priv DRM file private.
302 * \param cmd command.
303 * \param arg user argument, pointing to a drm_lock structure.
304 * \return zero on success or negative number on failure.
305 *
306 * Sets the requested interface version
307 */
308int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
309{
310	struct drm_set_version *sv = data;
311	int if_version, retcode = 0;
312
313	if (sv->drm_di_major != -1) {
314		if (sv->drm_di_major != DRM_IF_MAJOR ||
315		    sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
316			retcode = -EINVAL;
317			goto done;
318		}
319		if_version = DRM_IF_VERSION(sv->drm_di_major,
320					    sv->drm_di_minor);
321		dev->if_version = max(if_version, dev->if_version);
322		if (sv->drm_di_minor >= 1) {
323			/*
324			 * Version 1.1 includes tying of DRM to specific device
325			 * Version 1.4 has proper PCI domain support
326			 */
327			retcode = drm_set_busid(dev, file_priv);
328			if (retcode)
329				goto done;
330		}
331	}
332
333	if (sv->drm_dd_major != -1) {
334		if (sv->drm_dd_major != dev->driver->major ||
335		    sv->drm_dd_minor < 0 || sv->drm_dd_minor >
336		    dev->driver->minor) {
337			retcode = -EINVAL;
338			goto done;
339		}
340
341		if (dev->driver->set_version)
342			dev->driver->set_version(dev, sv);
343	}
344
345done:
346	sv->drm_di_major = DRM_IF_MAJOR;
347	sv->drm_di_minor = DRM_IF_MINOR;
348	sv->drm_dd_major = dev->driver->major;
349	sv->drm_dd_minor = dev->driver->minor;
350
351	return retcode;
352}
353
354/** No-op ioctl. */
355int drm_noop(struct drm_device *dev, void *data,
356	     struct drm_file *file_priv)
357{
358	DRM_DEBUG("\n");
359	return 0;
360}
361EXPORT_SYMBOL(drm_noop);
362