Root/drivers/gpu/drm/drm_ioctl.c

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

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