Root/drivers/gpu/drm/drm_stub.c

1/**
2 * \file drm_stub.h
3 * Stub support
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 */
7
8/*
9 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
10 *
11 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 */
33
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/slab.h>
37#include "drmP.h"
38#include "drm_core.h"
39
40unsigned int drm_debug = 0; /* 1 to enable debug output */
41EXPORT_SYMBOL(drm_debug);
42
43unsigned int drm_vblank_offdelay = 5000; /* Default to 5000 msecs. */
44EXPORT_SYMBOL(drm_vblank_offdelay);
45
46unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
47EXPORT_SYMBOL(drm_timestamp_precision);
48
49MODULE_AUTHOR(CORE_AUTHOR);
50MODULE_DESCRIPTION(CORE_DESC);
51MODULE_LICENSE("GPL and additional rights");
52MODULE_PARM_DESC(debug, "Enable debug output");
53MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
54MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
55
56module_param_named(debug, drm_debug, int, 0600);
57module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
58module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
59
60struct idr drm_minors_idr;
61
62struct class *drm_class;
63struct proc_dir_entry *drm_proc_root;
64struct dentry *drm_debugfs_root;
65
66int drm_err(const char *func, const char *format, ...)
67{
68    struct va_format vaf;
69    va_list args;
70    int r;
71
72    va_start(args, format);
73
74    vaf.fmt = format;
75    vaf.va = &args;
76
77    r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);
78
79    va_end(args);
80
81    return r;
82}
83EXPORT_SYMBOL(drm_err);
84
85void drm_ut_debug_printk(unsigned int request_level,
86             const char *prefix,
87             const char *function_name,
88             const char *format, ...)
89{
90    va_list args;
91
92    if (drm_debug & request_level) {
93        if (function_name)
94            printk(KERN_DEBUG "[%s:%s], ", prefix, function_name);
95        va_start(args, format);
96        vprintk(format, args);
97        va_end(args);
98    }
99}
100EXPORT_SYMBOL(drm_ut_debug_printk);
101
102static int drm_minor_get_id(struct drm_device *dev, int type)
103{
104    int new_id;
105    int ret;
106    int base = 0, limit = 63;
107
108    if (type == DRM_MINOR_CONTROL) {
109                base += 64;
110                limit = base + 127;
111        } else if (type == DRM_MINOR_RENDER) {
112                base += 128;
113                limit = base + 255;
114        }
115
116again:
117    if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
118        DRM_ERROR("Out of memory expanding drawable idr\n");
119        return -ENOMEM;
120    }
121    mutex_lock(&dev->struct_mutex);
122    ret = idr_get_new_above(&drm_minors_idr, NULL,
123                base, &new_id);
124    mutex_unlock(&dev->struct_mutex);
125    if (ret == -EAGAIN)
126        goto again;
127    else if (ret)
128        return ret;
129
130    if (new_id >= limit) {
131        idr_remove(&drm_minors_idr, new_id);
132        return -EINVAL;
133    }
134    return new_id;
135}
136
137struct drm_master *drm_master_create(struct drm_minor *minor)
138{
139    struct drm_master *master;
140
141    master = kzalloc(sizeof(*master), GFP_KERNEL);
142    if (!master)
143        return NULL;
144
145    kref_init(&master->refcount);
146    spin_lock_init(&master->lock.spinlock);
147    init_waitqueue_head(&master->lock.lock_queue);
148    drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
149    INIT_LIST_HEAD(&master->magicfree);
150    master->minor = minor;
151
152    list_add_tail(&master->head, &minor->master_list);
153
154    return master;
155}
156
157struct drm_master *drm_master_get(struct drm_master *master)
158{
159    kref_get(&master->refcount);
160    return master;
161}
162EXPORT_SYMBOL(drm_master_get);
163
164static void drm_master_destroy(struct kref *kref)
165{
166    struct drm_master *master = container_of(kref, struct drm_master, refcount);
167    struct drm_magic_entry *pt, *next;
168    struct drm_device *dev = master->minor->dev;
169    struct drm_map_list *r_list, *list_temp;
170
171    list_del(&master->head);
172
173    if (dev->driver->master_destroy)
174        dev->driver->master_destroy(dev, master);
175
176    list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
177        if (r_list->master == master) {
178            drm_rmmap_locked(dev, r_list->map);
179            r_list = NULL;
180        }
181    }
182
183    if (master->unique) {
184        kfree(master->unique);
185        master->unique = NULL;
186        master->unique_len = 0;
187    }
188
189    kfree(dev->devname);
190    dev->devname = NULL;
191
192    list_for_each_entry_safe(pt, next, &master->magicfree, head) {
193        list_del(&pt->head);
194        drm_ht_remove_item(&master->magiclist, &pt->hash_item);
195        kfree(pt);
196    }
197
198    drm_ht_remove(&master->magiclist);
199
200    kfree(master);
201}
202
203void drm_master_put(struct drm_master **master)
204{
205    kref_put(&(*master)->refcount, drm_master_destroy);
206    *master = NULL;
207}
208EXPORT_SYMBOL(drm_master_put);
209
210int drm_setmaster_ioctl(struct drm_device *dev, void *data,
211            struct drm_file *file_priv)
212{
213    int ret;
214
215    if (file_priv->is_master)
216        return 0;
217
218    if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
219        return -EINVAL;
220
221    if (!file_priv->master)
222        return -EINVAL;
223
224    if (!file_priv->minor->master &&
225        file_priv->minor->master != file_priv->master) {
226        mutex_lock(&dev->struct_mutex);
227        file_priv->minor->master = drm_master_get(file_priv->master);
228        file_priv->is_master = 1;
229        if (dev->driver->master_set) {
230            ret = dev->driver->master_set(dev, file_priv, false);
231            if (unlikely(ret != 0)) {
232                file_priv->is_master = 0;
233                drm_master_put(&file_priv->minor->master);
234            }
235        }
236        mutex_unlock(&dev->struct_mutex);
237    }
238
239    return 0;
240}
241
242int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
243             struct drm_file *file_priv)
244{
245    if (!file_priv->is_master)
246        return -EINVAL;
247
248    if (!file_priv->minor->master)
249        return -EINVAL;
250
251    mutex_lock(&dev->struct_mutex);
252    if (dev->driver->master_drop)
253        dev->driver->master_drop(dev, file_priv, false);
254    drm_master_put(&file_priv->minor->master);
255    file_priv->is_master = 0;
256    mutex_unlock(&dev->struct_mutex);
257    return 0;
258}
259
260int drm_fill_in_dev(struct drm_device *dev,
261               const struct pci_device_id *ent,
262               struct drm_driver *driver)
263{
264    int retcode;
265
266    INIT_LIST_HEAD(&dev->filelist);
267    INIT_LIST_HEAD(&dev->ctxlist);
268    INIT_LIST_HEAD(&dev->vmalist);
269    INIT_LIST_HEAD(&dev->maplist);
270    INIT_LIST_HEAD(&dev->vblank_event_list);
271
272    spin_lock_init(&dev->count_lock);
273    spin_lock_init(&dev->event_lock);
274    mutex_init(&dev->struct_mutex);
275    mutex_init(&dev->ctxlist_mutex);
276
277    if (drm_ht_create(&dev->map_hash, 12)) {
278        return -ENOMEM;
279    }
280
281    /* the DRM has 6 basic counters */
282    dev->counters = 6;
283    dev->types[0] = _DRM_STAT_LOCK;
284    dev->types[1] = _DRM_STAT_OPENS;
285    dev->types[2] = _DRM_STAT_CLOSES;
286    dev->types[3] = _DRM_STAT_IOCTLS;
287    dev->types[4] = _DRM_STAT_LOCKS;
288    dev->types[5] = _DRM_STAT_UNLOCKS;
289
290    dev->driver = driver;
291
292    if (dev->driver->bus->agp_init) {
293        retcode = dev->driver->bus->agp_init(dev);
294        if (retcode)
295            goto error_out_unreg;
296    }
297
298
299
300    retcode = drm_ctxbitmap_init(dev);
301    if (retcode) {
302        DRM_ERROR("Cannot allocate memory for context bitmap.\n");
303        goto error_out_unreg;
304    }
305
306    if (driver->driver_features & DRIVER_GEM) {
307        retcode = drm_gem_init(dev);
308        if (retcode) {
309            DRM_ERROR("Cannot initialize graphics execution "
310                  "manager (GEM)\n");
311            goto error_out_unreg;
312        }
313    }
314
315    return 0;
316
317      error_out_unreg:
318    drm_lastclose(dev);
319    return retcode;
320}
321EXPORT_SYMBOL(drm_fill_in_dev);
322
323
324/**
325 * Get a secondary minor number.
326 *
327 * \param dev device data structure
328 * \param sec-minor structure to hold the assigned minor
329 * \return negative number on failure.
330 *
331 * Search an empty entry and initialize it to the given parameters, and
332 * create the proc init entry via proc_init(). This routines assigns
333 * minor numbers to secondary heads of multi-headed cards
334 */
335int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
336{
337    struct drm_minor *new_minor;
338    int ret;
339    int minor_id;
340
341    DRM_DEBUG("\n");
342
343    minor_id = drm_minor_get_id(dev, type);
344    if (minor_id < 0)
345        return minor_id;
346
347    new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
348    if (!new_minor) {
349        ret = -ENOMEM;
350        goto err_idr;
351    }
352
353    new_minor->type = type;
354    new_minor->device = MKDEV(DRM_MAJOR, minor_id);
355    new_minor->dev = dev;
356    new_minor->index = minor_id;
357    INIT_LIST_HEAD(&new_minor->master_list);
358
359    idr_replace(&drm_minors_idr, new_minor, minor_id);
360
361    if (type == DRM_MINOR_LEGACY) {
362        ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
363        if (ret) {
364            DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
365            goto err_mem;
366        }
367    } else
368        new_minor->proc_root = NULL;
369
370#if defined(CONFIG_DEBUG_FS)
371    ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
372    if (ret) {
373        DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
374        goto err_g2;
375    }
376#endif
377
378    ret = drm_sysfs_device_add(new_minor);
379    if (ret) {
380        printk(KERN_ERR
381               "DRM: Error sysfs_device_add.\n");
382        goto err_g2;
383    }
384    *minor = new_minor;
385
386    DRM_DEBUG("new minor assigned %d\n", minor_id);
387    return 0;
388
389
390err_g2:
391    if (new_minor->type == DRM_MINOR_LEGACY)
392        drm_proc_cleanup(new_minor, drm_proc_root);
393err_mem:
394    kfree(new_minor);
395err_idr:
396    idr_remove(&drm_minors_idr, minor_id);
397    *minor = NULL;
398    return ret;
399}
400EXPORT_SYMBOL(drm_get_minor);
401
402/**
403 * Put a secondary minor number.
404 *
405 * \param sec_minor - structure to be released
406 * \return always zero
407 *
408 * Cleans up the proc resources. Not legal for this to be the
409 * last minor released.
410 *
411 */
412int drm_put_minor(struct drm_minor **minor_p)
413{
414    struct drm_minor *minor = *minor_p;
415
416    DRM_DEBUG("release secondary minor %d\n", minor->index);
417
418    if (minor->type == DRM_MINOR_LEGACY)
419        drm_proc_cleanup(minor, drm_proc_root);
420#if defined(CONFIG_DEBUG_FS)
421    drm_debugfs_cleanup(minor);
422#endif
423
424    drm_sysfs_device_remove(minor);
425
426    idr_remove(&drm_minors_idr, minor->index);
427
428    kfree(minor);
429    *minor_p = NULL;
430    return 0;
431}
432EXPORT_SYMBOL(drm_put_minor);
433
434static void drm_unplug_minor(struct drm_minor *minor)
435{
436    drm_sysfs_device_remove(minor);
437}
438
439/**
440 * Called via drm_exit() at module unload time or when pci device is
441 * unplugged.
442 *
443 * Cleans up all DRM device, calling drm_lastclose().
444 *
445 */
446void drm_put_dev(struct drm_device *dev)
447{
448    struct drm_driver *driver;
449    struct drm_map_list *r_list, *list_temp;
450
451    DRM_DEBUG("\n");
452
453    if (!dev) {
454        DRM_ERROR("cleanup called no dev\n");
455        return;
456    }
457    driver = dev->driver;
458
459    drm_lastclose(dev);
460
461    if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
462        dev->agp && dev->agp->agp_mtrr >= 0) {
463        int retval;
464        retval = mtrr_del(dev->agp->agp_mtrr,
465                  dev->agp->agp_info.aper_base,
466                  dev->agp->agp_info.aper_size * 1024 * 1024);
467        DRM_DEBUG("mtrr_del=%d\n", retval);
468    }
469
470    if (dev->driver->unload)
471        dev->driver->unload(dev);
472
473    if (drm_core_has_AGP(dev) && dev->agp) {
474        kfree(dev->agp);
475        dev->agp = NULL;
476    }
477
478    drm_vblank_cleanup(dev);
479
480    list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
481        drm_rmmap(dev, r_list->map);
482    drm_ht_remove(&dev->map_hash);
483
484    drm_ctxbitmap_cleanup(dev);
485
486    if (drm_core_check_feature(dev, DRIVER_MODESET))
487        drm_put_minor(&dev->control);
488
489    if (driver->driver_features & DRIVER_GEM)
490        drm_gem_destroy(dev);
491
492    drm_put_minor(&dev->primary);
493
494    list_del(&dev->driver_item);
495    if (dev->devname) {
496        kfree(dev->devname);
497        dev->devname = NULL;
498    }
499    kfree(dev);
500}
501EXPORT_SYMBOL(drm_put_dev);
502
503void drm_unplug_dev(struct drm_device *dev)
504{
505    /* for a USB device */
506    if (drm_core_check_feature(dev, DRIVER_MODESET))
507        drm_unplug_minor(dev->control);
508    drm_unplug_minor(dev->primary);
509
510    mutex_lock(&drm_global_mutex);
511
512    drm_device_set_unplugged(dev);
513
514    if (dev->open_count == 0) {
515        drm_put_dev(dev);
516    }
517    mutex_unlock(&drm_global_mutex);
518}
519EXPORT_SYMBOL(drm_unplug_dev);
520

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