1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* tdfx_context.c -- IOCTLs for tdfx contexts -*- c -*-
* Created: Thu Oct 7 10:50:22 1999 by faith@precisioninsight.com
* Revised: Sat Oct 9 23:39:56 1999 by faith@precisioninsight.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* $PI$
* $XFree86$
*
*/
#include "drmP.h"
#include "tdfx_drv.h"
extern drm_ctx_t tdfx_res_ctx;
static int tdfx_alloc_queue(drm_device_t *dev)
{
static int context = 0;
return ++context; /* Should this reuse contexts in the future? */
}
int tdfx_context_switch(drm_device_t *dev, int old, int new)
{
char buf[64];
atomic_inc(&dev->total_ctx);
if (test_and_set_bit(0, &dev->context_flag)) {
DRM_ERROR("Reentering -- FIXME\n");
return -EBUSY;
}
#if DRM_DMA_HISTOGRAM
getnanotime(&dev->ctx_start);
#endif
DRM_DEBUG("Context switch from %d to %d\n", old, new);
if (new == dev->last_context) {
clear_bit(0, &dev->context_flag);
return 0;
}
if (drm_flags & DRM_FLAG_NOCTX) {
tdfx_context_switch_complete(dev, new);
} else {
sprintf(buf, "C %d %d\n", old, new);
drm_write_string(dev, buf);
}
return 0;
}
int tdfx_context_switch_complete(drm_device_t *dev, int new)
{
dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
dev->last_switch = ticks;
if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("Lock isn't held after context switch\n");
}
/* If a context switch is ever initiated
when the kernel holds the lock, release
that lock here. */
#if DRM_DMA_HISTOGRAM
{
struct timespec ts;
getnanotime(&ts);
timespecsub(&ts, &dev->lck_start);
atomic_inc(&dev->histo.ctx[drm_histogram_slot(&ts)]);
}
#endif
clear_bit(0, &dev->context_flag);
wakeup(&dev->context_wait);
return 0;
}
int
tdfx_resctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_ctx_res_t res;
drm_ctx_t ctx;
int i, error;
DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
res = *(drm_ctx_res_t *) data;
if (res.count >= DRM_RESERVED_CONTEXTS) {
memset(&ctx, 0, sizeof(ctx));
for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
ctx.handle = i;
error = copyout(&i, &res.contexts[i], sizeof(i));
if (error) return error;
}
}
res.count = DRM_RESERVED_CONTEXTS;
*(drm_ctx_res_t *) data = res;
return 0;
}
int
tdfx_addctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_device_t *dev = kdev->si_drv1;
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
if ((ctx.handle = tdfx_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
/* Skip kernel's context and get a new one. */
ctx.handle = tdfx_alloc_queue(dev);
}
DRM_DEBUG("%d\n", ctx.handle);
*(drm_ctx_t *) data = ctx;
return 0;
}
int
tdfx_modctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
if (ctx.flags==_DRM_CONTEXT_PRESERVED)
tdfx_res_ctx.handle=ctx.handle;
return 0;
}
int
tdfx_getctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
/* This is 0, because we don't hanlde any context flags */
ctx.flags = 0;
*(drm_ctx_t *) data = ctx;
return 0;
}
int
tdfx_switchctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_device_t *dev = kdev->si_drv1;
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
DRM_DEBUG("%d\n", ctx.handle);
return tdfx_context_switch(dev, dev->last_context, ctx.handle);
}
int
tdfx_newctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_device_t *dev = kdev->si_drv1;
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
DRM_DEBUG("%d\n", ctx.handle);
tdfx_context_switch_complete(dev, ctx.handle);
return 0;
}
int
tdfx_rmctx(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
drm_ctx_t ctx;
ctx = *(drm_ctx_t *) data;
DRM_DEBUG("%d\n", ctx.handle);
/* This is currently a noop because we
don't reuse context values. Perhaps we
should? */
return 0;
}
|
