Root/drivers/gpu/drm/drm_drv.c

1/**
2 * \file drm_drv.c
3 * Generic driver template
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 *
8 * To use this template, you must at least define the following (samples
9 * given for the MGA driver):
10 *
11 * \code
12 * #define DRIVER_AUTHOR "VA Linux Systems, Inc."
13 *
14 * #define DRIVER_NAME "mga"
15 * #define DRIVER_DESC "Matrox G200/G400"
16 * #define DRIVER_DATE "20001127"
17 *
18 * #define drm_x mga_##x
19 * \endcode
20 */
21
22/*
23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
24 *
25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
27 * All Rights Reserved.
28 *
29 * Permission is hereby granted, free of charge, to any person obtaining a
30 * copy of this software and associated documentation files (the "Software"),
31 * to deal in the Software without restriction, including without limitation
32 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
33 * and/or sell copies of the Software, and to permit persons to whom the
34 * Software is furnished to do so, subject to the following conditions:
35 *
36 * The above copyright notice and this permission notice (including the next
37 * paragraph) shall be included in all copies or substantial portions of the
38 * Software.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
46 * OTHER DEALINGS IN THE SOFTWARE.
47 */
48
49#include <linux/debugfs.h>
50#include <linux/slab.h>
51#include <linux/export.h>
52#include "drmP.h"
53#include "drm_core.h"
54
55
56static int drm_version(struct drm_device *dev, void *data,
57               struct drm_file *file_priv);
58
59#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
60    [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
61
62/** Ioctl table */
63static struct drm_ioctl_desc drm_ioctls[] = {
64    DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED),
65    DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
66    DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
67    DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
68    DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
69    DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
70    DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
71    DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED),
72    DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
73
74    DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75    DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
76    DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
77    DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
78
79    DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
80    DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
81
82    DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
83    DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
84
85    DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
86    DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
87
88    DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
89    DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
90    DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
91    DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
92    DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
93    DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
94    DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
95
96    DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
97    DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
98
99    DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
100    DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
101
102    DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
103
104    DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
105    DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
106    DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
107    DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
108    DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
109    /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
110    DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
111
112    DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
113
114#if __OS_HAS_AGP
115    DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
116    DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
117    DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
118    DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
119    DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
120    DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
121    DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
122    DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
123#endif
124
125    DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
126    DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
127
128    DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
129
130    DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
131
132    DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
133
134    DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
135    DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
136    DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
137
138    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
139
140    DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED),
141    DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED),
142
143    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145    DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147    DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148    DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
150    DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
151    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153    DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154    DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156    DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
158    DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
159    DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
160    DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
161    DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
162    DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
163    DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
164    DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
165    DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
166    DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
167    DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
168    DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
169};
170
171#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
172
173/**
174 * Take down the DRM device.
175 *
176 * \param dev DRM device structure.
177 *
178 * Frees every resource in \p dev.
179 *
180 * \sa drm_device
181 */
182int drm_lastclose(struct drm_device * dev)
183{
184    struct drm_vma_entry *vma, *vma_temp;
185
186    DRM_DEBUG("\n");
187
188    if (dev->driver->lastclose)
189        dev->driver->lastclose(dev);
190    DRM_DEBUG("driver lastclose completed\n");
191
192    if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
193        drm_irq_uninstall(dev);
194
195    mutex_lock(&dev->struct_mutex);
196
197    /* Clear AGP information */
198    if (drm_core_has_AGP(dev) && dev->agp &&
199            !drm_core_check_feature(dev, DRIVER_MODESET)) {
200        struct drm_agp_mem *entry, *tempe;
201
202        /* Remove AGP resources, but leave dev->agp
203           intact until drv_cleanup is called. */
204        list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
205            if (entry->bound)
206                drm_unbind_agp(entry->memory);
207            drm_free_agp(entry->memory, entry->pages);
208            kfree(entry);
209        }
210        INIT_LIST_HEAD(&dev->agp->memory);
211
212        if (dev->agp->acquired)
213            drm_agp_release(dev);
214
215        dev->agp->acquired = 0;
216        dev->agp->enabled = 0;
217    }
218    if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
219        !drm_core_check_feature(dev, DRIVER_MODESET)) {
220        drm_sg_cleanup(dev->sg);
221        dev->sg = NULL;
222    }
223
224    /* Clear vma list (only built for debugging) */
225    list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
226        list_del(&vma->head);
227        kfree(vma);
228    }
229
230    if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
231        !drm_core_check_feature(dev, DRIVER_MODESET))
232        drm_dma_takedown(dev);
233
234    dev->dev_mapping = NULL;
235    mutex_unlock(&dev->struct_mutex);
236
237    DRM_DEBUG("lastclose completed\n");
238    return 0;
239}
240
241/** File operations structure */
242static const struct file_operations drm_stub_fops = {
243    .owner = THIS_MODULE,
244    .open = drm_stub_open,
245    .llseek = noop_llseek,
246};
247
248static int __init drm_core_init(void)
249{
250    int ret = -ENOMEM;
251
252    drm_global_init();
253    idr_init(&drm_minors_idr);
254
255    if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
256        goto err_p1;
257
258    drm_class = drm_sysfs_create(THIS_MODULE, "drm");
259    if (IS_ERR(drm_class)) {
260        printk(KERN_ERR "DRM: Error creating drm class.\n");
261        ret = PTR_ERR(drm_class);
262        goto err_p2;
263    }
264
265    drm_proc_root = proc_mkdir("dri", NULL);
266    if (!drm_proc_root) {
267        DRM_ERROR("Cannot create /proc/dri\n");
268        ret = -1;
269        goto err_p3;
270    }
271
272    drm_debugfs_root = debugfs_create_dir("dri", NULL);
273    if (!drm_debugfs_root) {
274        DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
275        ret = -1;
276        goto err_p3;
277    }
278
279    DRM_INFO("Initialized %s %d.%d.%d %s\n",
280         CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
281    return 0;
282err_p3:
283    drm_sysfs_destroy();
284err_p2:
285    unregister_chrdev(DRM_MAJOR, "drm");
286
287    idr_destroy(&drm_minors_idr);
288err_p1:
289    return ret;
290}
291
292static void __exit drm_core_exit(void)
293{
294    remove_proc_entry("dri", NULL);
295    debugfs_remove(drm_debugfs_root);
296    drm_sysfs_destroy();
297
298    unregister_chrdev(DRM_MAJOR, "drm");
299
300    idr_remove_all(&drm_minors_idr);
301    idr_destroy(&drm_minors_idr);
302}
303
304module_init(drm_core_init);
305module_exit(drm_core_exit);
306
307/**
308 * Copy and IOCTL return string to user space
309 */
310static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
311{
312    int len;
313
314    /* don't overflow userbuf */
315    len = strlen(value);
316    if (len > *buf_len)
317        len = *buf_len;
318
319    /* let userspace know exact length of driver value (which could be
320     * larger than the userspace-supplied buffer) */
321    *buf_len = strlen(value);
322
323    /* finally, try filling in the userbuf */
324    if (len && buf)
325        if (copy_to_user(buf, value, len))
326            return -EFAULT;
327    return 0;
328}
329
330/**
331 * Get version information
332 *
333 * \param inode device inode.
334 * \param filp file pointer.
335 * \param cmd command.
336 * \param arg user argument, pointing to a drm_version structure.
337 * \return zero on success or negative number on failure.
338 *
339 * Fills in the version information in \p arg.
340 */
341static int drm_version(struct drm_device *dev, void *data,
342               struct drm_file *file_priv)
343{
344    struct drm_version *version = data;
345    int err;
346
347    version->version_major = dev->driver->major;
348    version->version_minor = dev->driver->minor;
349    version->version_patchlevel = dev->driver->patchlevel;
350    err = drm_copy_field(version->name, &version->name_len,
351            dev->driver->name);
352    if (!err)
353        err = drm_copy_field(version->date, &version->date_len,
354                dev->driver->date);
355    if (!err)
356        err = drm_copy_field(version->desc, &version->desc_len,
357                dev->driver->desc);
358
359    return err;
360}
361
362/**
363 * Called whenever a process performs an ioctl on /dev/drm.
364 *
365 * \param inode device inode.
366 * \param file_priv DRM file private.
367 * \param cmd command.
368 * \param arg user argument.
369 * \return zero on success or negative number on failure.
370 *
371 * Looks up the ioctl function in the ::ioctls table, checking for root
372 * previleges if so required, and dispatches to the respective function.
373 */
374long drm_ioctl(struct file *filp,
375          unsigned int cmd, unsigned long arg)
376{
377    struct drm_file *file_priv = filp->private_data;
378    struct drm_device *dev;
379    struct drm_ioctl_desc *ioctl;
380    drm_ioctl_t *func;
381    unsigned int nr = DRM_IOCTL_NR(cmd);
382    int retcode = -EINVAL;
383    char stack_kdata[128];
384    char *kdata = NULL;
385    unsigned int usize, asize;
386
387    dev = file_priv->minor->dev;
388
389    if (drm_device_is_unplugged(dev))
390        return -ENODEV;
391
392    atomic_inc(&dev->ioctl_count);
393    atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
394    ++file_priv->ioctl_count;
395
396    DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
397          task_pid_nr(current), cmd, nr,
398          (long)old_encode_dev(file_priv->minor->device),
399          file_priv->authenticated);
400
401    if ((nr >= DRM_CORE_IOCTL_COUNT) &&
402        ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
403        goto err_i1;
404    if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
405        (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
406        u32 drv_size;
407        ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
408        drv_size = _IOC_SIZE(ioctl->cmd_drv);
409        usize = asize = _IOC_SIZE(cmd);
410        if (drv_size > asize)
411            asize = drv_size;
412    }
413    else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
414        ioctl = &drm_ioctls[nr];
415        cmd = ioctl->cmd;
416        usize = asize = _IOC_SIZE(cmd);
417    } else
418        goto err_i1;
419
420    /* Do not trust userspace, use our own definition */
421    func = ioctl->func;
422    /* is there a local override? */
423    if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
424        func = dev->driver->dma_ioctl;
425
426    if (!func) {
427        DRM_DEBUG("no function\n");
428        retcode = -EINVAL;
429    } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
430           ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
431           ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
432           (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
433        retcode = -EACCES;
434    } else {
435        if (cmd & (IOC_IN | IOC_OUT)) {
436            if (asize <= sizeof(stack_kdata)) {
437                kdata = stack_kdata;
438            } else {
439                kdata = kmalloc(asize, GFP_KERNEL);
440                if (!kdata) {
441                    retcode = -ENOMEM;
442                    goto err_i1;
443                }
444            }
445            if (asize > usize)
446                memset(kdata + usize, 0, asize - usize);
447        }
448
449        if (cmd & IOC_IN) {
450            if (copy_from_user(kdata, (void __user *)arg,
451                       usize) != 0) {
452                retcode = -EFAULT;
453                goto err_i1;
454            }
455        } else
456            memset(kdata, 0, usize);
457
458        if (ioctl->flags & DRM_UNLOCKED)
459            retcode = func(dev, kdata, file_priv);
460        else {
461            mutex_lock(&drm_global_mutex);
462            retcode = func(dev, kdata, file_priv);
463            mutex_unlock(&drm_global_mutex);
464        }
465
466        if (cmd & IOC_OUT) {
467            if (copy_to_user((void __user *)arg, kdata,
468                     usize) != 0)
469                retcode = -EFAULT;
470        }
471    }
472
473      err_i1:
474    if (kdata != stack_kdata)
475        kfree(kdata);
476    atomic_dec(&dev->ioctl_count);
477    if (retcode)
478        DRM_DEBUG("ret = %d\n", retcode);
479    return retcode;
480}
481
482EXPORT_SYMBOL(drm_ioctl);
483
484struct drm_local_map *drm_getsarea(struct drm_device *dev)
485{
486    struct drm_map_list *entry;
487
488    list_for_each_entry(entry, &dev->maplist, head) {
489        if (entry->map && entry->map->type == _DRM_SHM &&
490            (entry->map->flags & _DRM_CONTAINS_LOCK)) {
491            return entry->map;
492        }
493    }
494    return NULL;
495}
496EXPORT_SYMBOL(drm_getsarea);
497

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