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 "drmP.h"
37 #include "drm_core.h"
38
39 #include "linux/pci.h"
40
41 /**
42 * Get the bus id.
43 *
44 * \param inode device inode.
45 * \param file_priv DRM file private.
46 * \param cmd command.
47 * \param arg user argument, pointing to a drm_unique structure.
48 * \return zero on success or a negative number on failure.
49 *
50 * Copies the bus id from drm_device::unique into user space.
51 */
52 int drm_getunique(struct drm_device *dev, void *data,
53 struct drm_file *file_priv)
54 {
55 struct drm_unique *u = data;
56
57 if (u->unique_len >= dev->unique_len) {
58 if (copy_to_user(u->unique, dev->unique, dev->unique_len))
59 return -EFAULT;
60 }
61 u->unique_len = dev->unique_len;
62
63 return 0;
64 }
65
66 /**
67 * Set the bus id.
68 *
69 * \param inode device inode.
70 * \param file_priv DRM file private.
71 * \param cmd command.
72 * \param arg user argument, pointing to a drm_unique structure.
73 * \return zero on success or a negative number on failure.
74 *
75 * Copies the bus id from userspace into drm_device::unique, and verifies that
76 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
77 * in interface version 1.1 and will return EBUSY when setversion has requested
78 * version 1.1 or greater.
79 */
80 int drm_setunique(struct drm_device *dev, void *data,
81 struct drm_file *file_priv)
82 {
83 struct drm_unique *u = data;
84 int domain, bus, slot, func, ret;
85
86 if (dev->unique_len || dev->unique)
87 return -EBUSY;
88
89 if (!u->unique_len || u->unique_len > 1024)
90 return -EINVAL;
91
92 dev->unique_len = u->unique_len;
93 dev->unique = drm_alloc(u->unique_len + 1, DRM_MEM_DRIVER);
94 if (!dev->unique)
95 return -ENOMEM;
96 if (copy_from_user(dev->unique, u->unique, dev->unique_len))
97 return -EFAULT;
98
99 dev->unique[dev->unique_len] = '\0';
100
101 dev->devname =
102 drm_alloc(strlen(dev->driver->pci_driver.name) +
103 strlen(dev->unique) + 2, DRM_MEM_DRIVER);
104 if (!dev->devname)
105 return -ENOMEM;
106
107 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
108 dev->unique);
109
110 /* Return error if the busid submitted doesn't match the device's actual
111 * busid.
112 */
113 ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
114 if (ret != 3)
115 return -EINVAL;
116 domain = bus >> 8;
117 bus &= 0xff;
118
119 if ((domain != drm_get_pci_domain(dev)) ||
120 (bus != dev->pdev->bus->number) ||
121 (slot != PCI_SLOT(dev->pdev->devfn)) ||
122 (func != PCI_FUNC(dev->pdev->devfn)))
123 return -EINVAL;
124
125 return 0;
126 }
127
128 static int drm_set_busid(struct drm_device * dev)
129 {
130 int len;
131
132 if (dev->unique != NULL)
133 return 0;
134
135 dev->unique_len = 40;
136 dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
137 if (dev->unique == NULL)
138 return -ENOMEM;
139
140 len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
141 drm_get_pci_domain(dev), dev->pdev->bus->number,
142 PCI_SLOT(dev->pdev->devfn),
143 PCI_FUNC(dev->pdev->devfn));
144
145 if (len > dev->unique_len)
146 DRM_ERROR("Unique buffer overflowed\n");
147
148 dev->devname =
149 drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
150 2, DRM_MEM_DRIVER);
151 if (dev->devname == NULL)
152 return -ENOMEM;
153
154 sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
155 dev->unique);
156
157 return 0;
158 }
159
160 /**
161 * Get a mapping information.
162 *
163 * \param inode device inode.
164 * \param file_priv DRM file private.
165 * \param cmd command.
166 * \param arg user argument, pointing to a drm_map structure.
167 *
168 * \return zero on success or a negative number on failure.
169 *
170 * Searches for the mapping with the specified offset and copies its information
171 * into userspace
172 */
173 int drm_getmap(struct drm_device *dev, void *data,
174 struct drm_file *file_priv)
175 {
176 struct drm_map *map = data;
177 struct drm_map_list *r_list = NULL;
178 struct list_head *list;
179 int idx;
180 int i;
181
182 idx = map->offset;
183
184 mutex_lock(&dev->struct_mutex);
185 if (idx < 0) {
186 mutex_unlock(&dev->struct_mutex);
187 return -EINVAL;
188 }
189
190 i = 0;
191 list_for_each(list, &dev->maplist) {
192 if (i == idx) {
193 r_list = list_entry(list, struct drm_map_list, head);
194 break;
195 }
196 i++;
197 }
198 if (!r_list || !r_list->map) {
199 mutex_unlock(&dev->struct_mutex);
200 return -EINVAL;
201 }
202
203 map->offset = r_list->map->offset;
204 map->size = r_list->map->size;
205 map->type = r_list->map->type;
206 map->flags = r_list->map->flags;
207 map->handle = (void *)(unsigned long) r_list->user_token;
208 map->mtrr = r_list->map->mtrr;
209 mutex_unlock(&dev->struct_mutex);
210
211 return 0;
212 }
213
214 /**
215 * Get client information.
216 *
217 * \param inode device inode.
218 * \param file_priv DRM file private.
219 * \param cmd command.
220 * \param arg user argument, pointing to a drm_client structure.
221 *
222 * \return zero on success or a negative number on failure.
223 *
224 * Searches for the client with the specified index and copies its information
225 * into userspace
226 */
227 int drm_getclient(struct drm_device *dev, void *data,
228 struct drm_file *file_priv)
229 {
230 struct drm_client *client = data;
231 struct drm_file *pt;
232 int idx;
233 int i;
234
235 idx = client->idx;
236 mutex_lock(&dev->struct_mutex);
237
238 i = 0;
239 list_for_each_entry(pt, &dev->filelist, lhead) {
240 if (i++ >= idx) {
241 client->auth = pt->authenticated;
242 client->pid = pt->pid;
243 client->uid = pt->uid;
244 client->magic = pt->magic;
245 client->iocs = pt->ioctl_count;
246 mutex_unlock(&dev->struct_mutex);
247
248 return 0;
249 }
250 }
251 mutex_unlock(&dev->struct_mutex);
252
253 return -EINVAL;
254 }
255
256 /**
257 * Get statistics information.
258 *
259 * \param inode device inode.
260 * \param file_priv DRM file private.
261 * \param cmd command.
262 * \param arg user argument, pointing to a drm_stats structure.
263 *
264 * \return zero on success or a negative number on failure.
265 */
266 int drm_getstats(struct drm_device *dev, void *data,
267 struct drm_file *file_priv)
268 {
269 struct drm_stats *stats = data;
270 int i;
271
272 memset(stats, 0, sizeof(*stats));
273
274 mutex_lock(&dev->struct_mutex);
275
276 for (i = 0; i < dev->counters; i++) {
277 if (dev->types[i] == _DRM_STAT_LOCK)
278 stats->data[i].value =
279 (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
280 else
281 stats->data[i].value = atomic_read(&dev->counts[i]);
282 stats->data[i].type = dev->types[i];
283 }
284
285 stats->count = dev->counters;
286
287 mutex_unlock(&dev->struct_mutex);
288
289 return 0;
290 }
291
292 /**
293 * Setversion ioctl.
294 *
295 * \param inode device inode.
296 * \param file_priv DRM file private.
297 * \param cmd command.
298 * \param arg user argument, pointing to a drm_lock structure.
299 * \return zero on success or negative number on failure.
300 *
301 * Sets the requested interface version
302 */
303 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
304 {
305 struct drm_set_version *sv = data;
306 int if_version, retcode = 0;
307
308 if (sv->drm_di_major != -1) {
309 if (sv->drm_di_major != DRM_IF_MAJOR ||
310 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
311 retcode = -EINVAL;
312 goto done;
313 }
314 if_version = DRM_IF_VERSION(sv->drm_di_major,
315 sv->drm_di_minor);
316 dev->if_version = max(if_version, dev->if_version);
317 if (sv->drm_di_minor >= 1) {
318 /*
319 * Version 1.1 includes tying of DRM to specific device
320 */
321 drm_set_busid(dev);
322 }
323 }
324
325 if (sv->drm_dd_major != -1) {
326 if (sv->drm_dd_major != dev->driver->major ||
327 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
328 dev->driver->minor) {
329 retcode = -EINVAL;
330 goto done;
331 }
332
333 if (dev->driver->set_version)
334 dev->driver->set_version(dev, sv);
335 }
336
337 done:
338 sv->drm_di_major = DRM_IF_MAJOR;
339 sv->drm_di_minor = DRM_IF_MINOR;
340 sv->drm_dd_major = dev->driver->major;
341 sv->drm_dd_minor = dev->driver->minor;
342
343 return retcode;
344 }
345
346 /** No-op ioctl. */
347 int drm_noop(struct drm_device *dev, void *data,
348 struct drm_file *file_priv)
349 {
350 DRM_DEBUG("\n");
351 return 0;
352 }
353
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