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1da177e4 LT |
1 | /* lock.c -- IOCTLs for locking -*- linux-c -*- |
2 | * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com | |
3 | * | |
4 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
5 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
6 | * All Rights Reserved. | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a | |
9 | * copy of this software and associated documentation files (the "Software"), | |
10 | * to deal in the Software without restriction, including without limitation | |
11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
12 | * and/or sell copies of the Software, and to permit persons to whom the | |
13 | * Software is furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice (including the next | |
16 | * paragraph) shall be included in all copies or substantial portions of the | |
17 | * Software. | |
18 | * | |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
22 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
23 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
24 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
25 | * OTHER DEALINGS IN THE SOFTWARE. | |
26 | * | |
27 | * Authors: | |
28 | * Rickard E. (Rik) Faith <faith@valinux.com> | |
29 | * Gareth Hughes <gareth@valinux.com> | |
30 | */ | |
31 | ||
32 | ||
33 | /* Gamma-specific code extracted from drm_lock.h: | |
34 | */ | |
35 | static int DRM(flush_queue)(drm_device_t *dev, int context) | |
36 | { | |
37 | DECLARE_WAITQUEUE(entry, current); | |
38 | int ret = 0; | |
39 | drm_queue_t *q = dev->queuelist[context]; | |
40 | ||
41 | DRM_DEBUG("\n"); | |
42 | ||
43 | atomic_inc(&q->use_count); | |
44 | if (atomic_read(&q->use_count) > 1) { | |
45 | atomic_inc(&q->block_write); | |
46 | add_wait_queue(&q->flush_queue, &entry); | |
47 | atomic_inc(&q->block_count); | |
48 | for (;;) { | |
49 | current->state = TASK_INTERRUPTIBLE; | |
50 | if (!DRM_BUFCOUNT(&q->waitlist)) break; | |
51 | schedule(); | |
52 | if (signal_pending(current)) { | |
53 | ret = -EINTR; /* Can't restart */ | |
54 | break; | |
55 | } | |
56 | } | |
57 | atomic_dec(&q->block_count); | |
58 | current->state = TASK_RUNNING; | |
59 | remove_wait_queue(&q->flush_queue, &entry); | |
60 | } | |
61 | atomic_dec(&q->use_count); | |
62 | ||
63 | /* NOTE: block_write is still incremented! | |
64 | Use drm_flush_unlock_queue to decrement. */ | |
65 | return ret; | |
66 | } | |
67 | ||
68 | static int DRM(flush_unblock_queue)(drm_device_t *dev, int context) | |
69 | { | |
70 | drm_queue_t *q = dev->queuelist[context]; | |
71 | ||
72 | DRM_DEBUG("\n"); | |
73 | ||
74 | atomic_inc(&q->use_count); | |
75 | if (atomic_read(&q->use_count) > 1) { | |
76 | if (atomic_read(&q->block_write)) { | |
77 | atomic_dec(&q->block_write); | |
78 | wake_up_interruptible(&q->write_queue); | |
79 | } | |
80 | } | |
81 | atomic_dec(&q->use_count); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | int DRM(flush_block_and_flush)(drm_device_t *dev, int context, | |
86 | drm_lock_flags_t flags) | |
87 | { | |
88 | int ret = 0; | |
89 | int i; | |
90 | ||
91 | DRM_DEBUG("\n"); | |
92 | ||
93 | if (flags & _DRM_LOCK_FLUSH) { | |
94 | ret = DRM(flush_queue)(dev, DRM_KERNEL_CONTEXT); | |
95 | if (!ret) ret = DRM(flush_queue)(dev, context); | |
96 | } | |
97 | if (flags & _DRM_LOCK_FLUSH_ALL) { | |
98 | for (i = 0; !ret && i < dev->queue_count; i++) { | |
99 | ret = DRM(flush_queue)(dev, i); | |
100 | } | |
101 | } | |
102 | return ret; | |
103 | } | |
104 | ||
105 | int DRM(flush_unblock)(drm_device_t *dev, int context, drm_lock_flags_t flags) | |
106 | { | |
107 | int ret = 0; | |
108 | int i; | |
109 | ||
110 | DRM_DEBUG("\n"); | |
111 | ||
112 | if (flags & _DRM_LOCK_FLUSH) { | |
113 | ret = DRM(flush_unblock_queue)(dev, DRM_KERNEL_CONTEXT); | |
114 | if (!ret) ret = DRM(flush_unblock_queue)(dev, context); | |
115 | } | |
116 | if (flags & _DRM_LOCK_FLUSH_ALL) { | |
117 | for (i = 0; !ret && i < dev->queue_count; i++) { | |
118 | ret = DRM(flush_unblock_queue)(dev, i); | |
119 | } | |
120 | } | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
125 | int DRM(finish)(struct inode *inode, struct file *filp, unsigned int cmd, | |
126 | unsigned long arg) | |
127 | { | |
128 | drm_file_t *priv = filp->private_data; | |
129 | drm_device_t *dev = priv->dev; | |
130 | int ret = 0; | |
131 | drm_lock_t lock; | |
132 | ||
133 | DRM_DEBUG("\n"); | |
134 | ||
135 | if (copy_from_user(&lock, (drm_lock_t __user *)arg, sizeof(lock))) | |
136 | return -EFAULT; | |
137 | ret = DRM(flush_block_and_flush)(dev, lock.context, lock.flags); | |
138 | DRM(flush_unblock)(dev, lock.context, lock.flags); | |
139 | return ret; | |
140 | } |