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Diffstat (limited to 'drivers/char/drm/gamma_lists.h')
-rw-r--r--drivers/char/drm/gamma_lists.h215
1 files changed, 0 insertions, 215 deletions
diff --git a/drivers/char/drm/gamma_lists.h b/drivers/char/drm/gamma_lists.h
deleted file mode 100644
index 2d93f412b96b..000000000000
--- a/drivers/char/drm/gamma_lists.h
+++ /dev/null
@@ -1,215 +0,0 @@
1/* drm_lists.h -- Buffer list handling routines -*- linux-c -*-
2 * Created: Mon Apr 19 20:54:22 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#include "drmP.h"
33
34
35int DRM(waitlist_create)(drm_waitlist_t *bl, int count)
36{
37 if (bl->count) return -EINVAL;
38
39 bl->bufs = DRM(alloc)((bl->count + 2) * sizeof(*bl->bufs),
40 DRM_MEM_BUFLISTS);
41
42 if(!bl->bufs) return -ENOMEM;
43 memset(bl->bufs, 0, sizeof(*bl->bufs));
44 bl->count = count;
45 bl->rp = bl->bufs;
46 bl->wp = bl->bufs;
47 bl->end = &bl->bufs[bl->count+1];
48 spin_lock_init(&bl->write_lock);
49 spin_lock_init(&bl->read_lock);
50 return 0;
51}
52
53int DRM(waitlist_destroy)(drm_waitlist_t *bl)
54{
55 if (bl->rp != bl->wp) return -EINVAL;
56 if (bl->bufs) DRM(free)(bl->bufs,
57 (bl->count + 2) * sizeof(*bl->bufs),
58 DRM_MEM_BUFLISTS);
59 bl->count = 0;
60 bl->bufs = NULL;
61 bl->rp = NULL;
62 bl->wp = NULL;
63 bl->end = NULL;
64 return 0;
65}
66
67int DRM(waitlist_put)(drm_waitlist_t *bl, drm_buf_t *buf)
68{
69 int left;
70 unsigned long flags;
71
72 left = DRM_LEFTCOUNT(bl);
73 if (!left) {
74 DRM_ERROR("Overflow while adding buffer %d from filp %p\n",
75 buf->idx, buf->filp);
76 return -EINVAL;
77 }
78 buf->list = DRM_LIST_WAIT;
79
80 spin_lock_irqsave(&bl->write_lock, flags);
81 *bl->wp = buf;
82 if (++bl->wp >= bl->end) bl->wp = bl->bufs;
83 spin_unlock_irqrestore(&bl->write_lock, flags);
84
85 return 0;
86}
87
88drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl)
89{
90 drm_buf_t *buf;
91 unsigned long flags;
92
93 spin_lock_irqsave(&bl->read_lock, flags);
94 buf = *bl->rp;
95 if (bl->rp == bl->wp) {
96 spin_unlock_irqrestore(&bl->read_lock, flags);
97 return NULL;
98 }
99 if (++bl->rp >= bl->end) bl->rp = bl->bufs;
100 spin_unlock_irqrestore(&bl->read_lock, flags);
101
102 return buf;
103}
104
105int DRM(freelist_create)(drm_freelist_t *bl, int count)
106{
107 atomic_set(&bl->count, 0);
108 bl->next = NULL;
109 init_waitqueue_head(&bl->waiting);
110 bl->low_mark = 0;
111 bl->high_mark = 0;
112 atomic_set(&bl->wfh, 0);
113 spin_lock_init(&bl->lock);
114 ++bl->initialized;
115 return 0;
116}
117
118int DRM(freelist_destroy)(drm_freelist_t *bl)
119{
120 atomic_set(&bl->count, 0);
121 bl->next = NULL;
122 return 0;
123}
124
125int DRM(freelist_put)(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf)
126{
127 drm_device_dma_t *dma = dev->dma;
128
129 if (!dma) {
130 DRM_ERROR("No DMA support\n");
131 return 1;
132 }
133
134 if (buf->waiting || buf->pending || buf->list == DRM_LIST_FREE) {
135 DRM_ERROR("Freed buffer %d: w%d, p%d, l%d\n",
136 buf->idx, buf->waiting, buf->pending, buf->list);
137 }
138 if (!bl) return 1;
139 buf->list = DRM_LIST_FREE;
140
141 spin_lock(&bl->lock);
142 buf->next = bl->next;
143 bl->next = buf;
144 spin_unlock(&bl->lock);
145
146 atomic_inc(&bl->count);
147 if (atomic_read(&bl->count) > dma->buf_count) {
148 DRM_ERROR("%d of %d buffers free after addition of %d\n",
149 atomic_read(&bl->count), dma->buf_count, buf->idx);
150 return 1;
151 }
152 /* Check for high water mark */
153 if (atomic_read(&bl->wfh) && atomic_read(&bl->count)>=bl->high_mark) {
154 atomic_set(&bl->wfh, 0);
155 wake_up_interruptible(&bl->waiting);
156 }
157 return 0;
158}
159
160static drm_buf_t *DRM(freelist_try)(drm_freelist_t *bl)
161{
162 drm_buf_t *buf;
163
164 if (!bl) return NULL;
165
166 /* Get buffer */
167 spin_lock(&bl->lock);
168 if (!bl->next) {
169 spin_unlock(&bl->lock);
170 return NULL;
171 }
172 buf = bl->next;
173 bl->next = bl->next->next;
174 spin_unlock(&bl->lock);
175
176 atomic_dec(&bl->count);
177 buf->next = NULL;
178 buf->list = DRM_LIST_NONE;
179 if (buf->waiting || buf->pending) {
180 DRM_ERROR("Free buffer %d: w%d, p%d, l%d\n",
181 buf->idx, buf->waiting, buf->pending, buf->list);
182 }
183
184 return buf;
185}
186
187drm_buf_t *DRM(freelist_get)(drm_freelist_t *bl, int block)
188{
189 drm_buf_t *buf = NULL;
190 DECLARE_WAITQUEUE(entry, current);
191
192 if (!bl || !bl->initialized) return NULL;
193
194 /* Check for low water mark */
195 if (atomic_read(&bl->count) <= bl->low_mark) /* Became low */
196 atomic_set(&bl->wfh, 1);
197 if (atomic_read(&bl->wfh)) {
198 if (block) {
199 add_wait_queue(&bl->waiting, &entry);
200 for (;;) {
201 current->state = TASK_INTERRUPTIBLE;
202 if (!atomic_read(&bl->wfh)
203 && (buf = DRM(freelist_try)(bl))) break;
204 schedule();
205 if (signal_pending(current)) break;
206 }
207 current->state = TASK_RUNNING;
208 remove_wait_queue(&bl->waiting, &entry);
209 }
210 return buf;
211 }
212
213 return DRM(freelist_try)(bl);
214}
215
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