summaryrefslogtreecommitdiffstats
path: root/drivers/char/drm/r128_context.c
blob: f11453ba1b55da4e57839a92ac4160f75b08eff0 (plain)
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
202
203
204
205
206
207
208
209
210
211
212
213
/* r128_context.c -- IOCTLs for r128 contexts -*- linux-c -*-
 * Created: Mon Dec 13 09:51:35 1999 by faith@precisioninsight.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * 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.
 * 
 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 *
 */

#include <linux/sched.h>

#define __NO_VERSION__
#include "drmP.h"
#include "r128_drv.h"

extern drm_ctx_t r128_res_ctx;

static int r128_alloc_queue(drm_device_t *dev)
{
#if 0
	static int context = 0;
#endif

	return drm_ctxbitmap_next(dev);
}

int r128_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
        dev->ctx_start = get_cycles();
#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) {
                r128_context_switch_complete(dev, new);
        } else {
                sprintf(buf, "C %d %d\n", old, new);
                drm_write_string(dev, buf);
        }
        
        return 0;
}

int r128_context_switch_complete(drm_device_t *dev, int new)
{
        dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */
        dev->last_switch  = jiffies;
        
        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
        atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles()
                                                      - dev->ctx_start)]);
                   
#endif
        clear_bit(0, &dev->context_flag);
        wake_up(&dev->context_wait);
        
        return 0;
}


int r128_resctx(struct inode *inode, struct file *filp, unsigned int cmd,
	       unsigned long arg)
{
	drm_ctx_res_t	res;
	drm_ctx_t	ctx;
	int		i;

	DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
	copy_from_user_ret(&res, (drm_ctx_res_t *)arg, sizeof(res), -EFAULT);
	if (res.count >= DRM_RESERVED_CONTEXTS) {
		memset(&ctx, 0, sizeof(ctx));
		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
			ctx.handle = i;
			copy_to_user_ret(&res.contexts[i],
					 &i,
					 sizeof(i),
					 -EFAULT);
		}
	}
	res.count = DRM_RESERVED_CONTEXTS;
	copy_to_user_ret((drm_ctx_res_t *)arg, &res, sizeof(res), -EFAULT);
	return 0;
}


int r128_addctx(struct inode *inode, struct file *filp, unsigned int cmd,
	       unsigned long arg)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_ctx_t	ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
	if ((ctx.handle = r128_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
				/* Skip kernel's context and get a new one. */
		ctx.handle = r128_alloc_queue(dev);
	}
	DRM_DEBUG("%d\n", ctx.handle);
	if (ctx.handle == -1) {
		DRM_DEBUG("Not enough free contexts.\n");
				/* Should this return -EBUSY instead? */
		return -ENOMEM;
	}

	copy_to_user_ret((drm_ctx_t *)arg, &ctx, sizeof(ctx), -EFAULT);
	return 0;
}

int r128_modctx(struct inode *inode, struct file *filp, unsigned int cmd,
	unsigned long arg)
{
	drm_ctx_t ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
	if (ctx.flags==_DRM_CONTEXT_PRESERVED)
		r128_res_ctx.handle=ctx.handle;
	return 0;
}

int r128_getctx(struct inode *inode, struct file *filp, unsigned int cmd,
	unsigned long arg)
{
	drm_ctx_t ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t*)arg, sizeof(ctx), -EFAULT);
	/* This is 0, because we don't hanlde any context flags */
	ctx.flags = 0;
	copy_to_user_ret((drm_ctx_t*)arg, &ctx, sizeof(ctx), -EFAULT);
	return 0;
}

int r128_switchctx(struct inode *inode, struct file *filp, unsigned int cmd,
		   unsigned long arg)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_ctx_t	ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
	DRM_DEBUG("%d\n", ctx.handle);
	return r128_context_switch(dev, dev->last_context, ctx.handle);
}

int r128_newctx(struct inode *inode, struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_ctx_t	ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
	DRM_DEBUG("%d\n", ctx.handle);
	r128_context_switch_complete(dev, ctx.handle);

	return 0;
}

int r128_rmctx(struct inode *inode, struct file *filp, unsigned int cmd,
	       unsigned long arg)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_ctx_t	ctx;

	copy_from_user_ret(&ctx, (drm_ctx_t *)arg, sizeof(ctx), -EFAULT);
	DRM_DEBUG("%d\n", ctx.handle);
	drm_ctxbitmap_free(dev, ctx.handle);

	return 0;
}