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
|
/* i830_dma.c -- DMA support for the I830 -*- linux-c -*-
*
* Copyright 2002 Tungsten Graphics, Inc.
* 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
* TUNGSTEN GRAPHICS 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.
*
* Authors: Keith Whitwell <keith@tungstengraphics.com>
*
*/
#include "drmP.h"
#include "drm.h"
#include "i830_drm.h"
#include "i830_drv.h"
#include <linux/interrupt.h> /* For task queue support */
#include <linux/delay.h>
irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
u16 temp;
temp = I830_READ16(I830REG_INT_IDENTITY_R);
DRM_DEBUG("%x\n", temp);
if (!(temp & 2))
return IRQ_NONE;
I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
atomic_inc(&dev_priv->irq_received);
wake_up_interruptible(&dev_priv->irq_queue);
return IRQ_HANDLED;
}
static int i830_emit_irq(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
DRM_DEBUG("%s\n", __FUNCTION__);
atomic_inc(&dev_priv->irq_emitted);
BEGIN_LP_RING(2);
OUT_RING(0);
OUT_RING(GFX_OP_USER_INTERRUPT);
ADVANCE_LP_RING();
return atomic_read(&dev_priv->irq_emitted);
}
static int i830_wait_irq(struct drm_device * dev, int irq_nr)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
DECLARE_WAITQUEUE(entry, current);
unsigned long end = jiffies + HZ * 3;
int ret = 0;
DRM_DEBUG("%s\n", __FUNCTION__);
if (atomic_read(&dev_priv->irq_received) >= irq_nr)
return 0;
dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
add_wait_queue(&dev_priv->irq_queue, &entry);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if (atomic_read(&dev_priv->irq_received) >= irq_nr)
break;
if ((signed)(end - jiffies) <= 0) {
DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
I830_READ16(I830REG_INT_IDENTITY_R),
I830_READ16(I830REG_INT_MASK_R),
I830_READ16(I830REG_INT_ENABLE_R),
I830_READ16(I830REG_HWSTAM));
ret = -EBUSY; /* Lockup? Missed irq? */
break;
}
schedule_timeout(HZ * 3);
if (signal_pending(current)) {
ret = -EINTR;
break;
}
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&dev_priv->irq_queue, &entry);
return ret;
}
/* Needs the lock as it touches the ring.
*/
int i830_irq_emit(struct inode *inode, struct drm_file *file_priv,
unsigned int cmd, unsigned long arg)
{
struct drm_device *dev = file_priv->head->dev;
drm_i830_private_t *dev_priv = dev->dev_private;
drm_i830_irq_emit_t emit;
int result;
LOCK_TEST_WITH_RETURN(dev, file_priv);
if (!dev_priv) {
DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
return -EINVAL;
}
if (copy_from_user
(&emit, (drm_i830_irq_emit_t __user *) arg, sizeof(emit)))
return -EFAULT;
result = i830_emit_irq(dev);
if (copy_to_user(emit.irq_seq, &result, sizeof(int))) {
DRM_ERROR("copy_to_user\n");
return -EFAULT;
}
return 0;
}
/* Doesn't need the hardware lock.
*/
int i830_irq_wait(struct inode *inode, struct drm_file *file_priv,
unsigned int cmd, unsigned long arg)
{
struct drm_device *dev = file_priv->head->dev;
drm_i830_private_t *dev_priv = dev->dev_private;
drm_i830_irq_wait_t irqwait;
if (!dev_priv) {
DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
return -EINVAL;
}
if (copy_from_user(&irqwait, (drm_i830_irq_wait_t __user *) arg,
sizeof(irqwait)))
return -EFAULT;
return i830_wait_irq(dev, irqwait.irq_seq);
}
/* drm_dma.h hooks
*/
void i830_driver_irq_preinstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
I830_WRITE16(I830REG_HWSTAM, 0xffff);
I830_WRITE16(I830REG_INT_MASK_R, 0x0);
I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
atomic_set(&dev_priv->irq_received, 0);
atomic_set(&dev_priv->irq_emitted, 0);
init_waitqueue_head(&dev_priv->irq_queue);
}
void i830_driver_irq_postinstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
I830_WRITE16(I830REG_INT_ENABLE_R, 0x2);
}
void i830_driver_irq_uninstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
if (!dev_priv)
return;
I830_WRITE16(I830REG_INT_MASK_R, 0xffff);
I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
}
|
