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0d6aa60b | 1 | /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*- |
1da177e4 | 2 | */ |
0d6aa60b | 3 | /* |
1da177e4 LT |
4 | * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. |
5 | * All Rights Reserved. | |
bc54fd1a DA |
6 | * |
7 | * Permission is hereby granted, free of charge, to any person obtaining a | |
8 | * copy of this software and associated documentation files (the | |
9 | * "Software"), to deal in the Software without restriction, including | |
10 | * without limitation the rights to use, copy, modify, merge, publish, | |
11 | * distribute, sub license, and/or sell copies of the Software, and to | |
12 | * permit persons to whom the Software is furnished to do so, subject to | |
13 | * the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice (including the | |
16 | * next paragraph) shall be included in all copies or substantial portions | |
17 | * of the Software. | |
18 | * | |
19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. | |
22 | * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR | |
23 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
24 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
25 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
26 | * | |
0d6aa60b | 27 | */ |
1da177e4 LT |
28 | |
29 | #include "drmP.h" | |
30 | #include "drm.h" | |
31 | #include "i915_drm.h" | |
32 | #include "i915_drv.h" | |
33 | ||
0d6aa60b DA |
34 | #define USER_INT_FLAG (1<<1) |
35 | #define VSYNC_PIPEB_FLAG (1<<5) | |
36 | #define VSYNC_PIPEA_FLAG (1<<7) | |
37 | ||
1da177e4 | 38 | #define MAX_NOPID ((u32)~0) |
1da177e4 LT |
39 | |
40 | irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS) | |
41 | { | |
42 | drm_device_t *dev = (drm_device_t *) arg; | |
43 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
44 | u16 temp; | |
45 | ||
46 | temp = I915_READ16(I915REG_INT_IDENTITY_R); | |
0d6aa60b | 47 | temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG); |
1da177e4 LT |
48 | |
49 | DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp); | |
50 | ||
51 | if (temp == 0) | |
52 | return IRQ_NONE; | |
53 | ||
54 | I915_WRITE16(I915REG_INT_IDENTITY_R, temp); | |
0d6aa60b | 55 | |
6e5fca53 DA |
56 | dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); |
57 | ||
0d6aa60b DA |
58 | if (temp & USER_INT_FLAG) |
59 | DRM_WAKEUP(&dev_priv->irq_queue); | |
60 | ||
61 | if (temp & VSYNC_PIPEA_FLAG) { | |
62 | atomic_inc(&dev->vbl_received); | |
63 | DRM_WAKEUP(&dev->vbl_queue); | |
64 | drm_vbl_send_signals(dev); | |
65 | } | |
1da177e4 LT |
66 | |
67 | return IRQ_HANDLED; | |
68 | } | |
69 | ||
c94f7029 | 70 | static int i915_emit_irq(drm_device_t * dev) |
1da177e4 LT |
71 | { |
72 | drm_i915_private_t *dev_priv = dev->dev_private; | |
73 | u32 ret; | |
74 | RING_LOCALS; | |
75 | ||
76 | i915_kernel_lost_context(dev); | |
77 | ||
78 | DRM_DEBUG("%s\n", __FUNCTION__); | |
79 | ||
80 | ret = dev_priv->counter; | |
81 | ||
82 | BEGIN_LP_RING(2); | |
83 | OUT_RING(0); | |
84 | OUT_RING(GFX_OP_USER_INTERRUPT); | |
85 | ADVANCE_LP_RING(); | |
86 | ||
87 | return ret; | |
88 | } | |
89 | ||
c94f7029 | 90 | static int i915_wait_irq(drm_device_t * dev, int irq_nr) |
1da177e4 LT |
91 | { |
92 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
93 | int ret = 0; | |
94 | ||
95 | DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr, | |
96 | READ_BREADCRUMB(dev_priv)); | |
97 | ||
98 | if (READ_BREADCRUMB(dev_priv) >= irq_nr) | |
99 | return 0; | |
100 | ||
101 | dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; | |
102 | ||
103 | DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ, | |
104 | READ_BREADCRUMB(dev_priv) >= irq_nr); | |
105 | ||
106 | if (ret == DRM_ERR(EBUSY)) { | |
107 | DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n", | |
108 | __FUNCTION__, | |
109 | READ_BREADCRUMB(dev_priv), (int)dev_priv->counter); | |
110 | } | |
111 | ||
112 | dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); | |
113 | return ret; | |
114 | } | |
115 | ||
0d6aa60b DA |
116 | int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence) |
117 | { | |
118 | drm_i915_private_t *dev_priv = dev->dev_private; | |
119 | unsigned int cur_vblank; | |
120 | int ret = 0; | |
121 | ||
122 | if (!dev_priv) { | |
123 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
124 | return DRM_ERR(EINVAL); | |
125 | } | |
126 | ||
127 | DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ, | |
128 | (((cur_vblank = atomic_read(&dev->vbl_received)) | |
129 | - *sequence) <= (1<<23))); | |
130 | ||
131 | *sequence = cur_vblank; | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
136 | ||
1da177e4 LT |
137 | /* Needs the lock as it touches the ring. |
138 | */ | |
139 | int i915_irq_emit(DRM_IOCTL_ARGS) | |
140 | { | |
141 | DRM_DEVICE; | |
142 | drm_i915_private_t *dev_priv = dev->dev_private; | |
143 | drm_i915_irq_emit_t emit; | |
144 | int result; | |
145 | ||
146 | LOCK_TEST_WITH_RETURN(dev, filp); | |
147 | ||
148 | if (!dev_priv) { | |
149 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
150 | return DRM_ERR(EINVAL); | |
151 | } | |
152 | ||
153 | DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data, | |
154 | sizeof(emit)); | |
155 | ||
156 | result = i915_emit_irq(dev); | |
157 | ||
158 | if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) { | |
159 | DRM_ERROR("copy_to_user\n"); | |
160 | return DRM_ERR(EFAULT); | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /* Doesn't need the hardware lock. | |
167 | */ | |
168 | int i915_irq_wait(DRM_IOCTL_ARGS) | |
169 | { | |
170 | DRM_DEVICE; | |
171 | drm_i915_private_t *dev_priv = dev->dev_private; | |
172 | drm_i915_irq_wait_t irqwait; | |
173 | ||
174 | if (!dev_priv) { | |
175 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
176 | return DRM_ERR(EINVAL); | |
177 | } | |
178 | ||
179 | DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data, | |
180 | sizeof(irqwait)); | |
181 | ||
182 | return i915_wait_irq(dev, irqwait.irq_seq); | |
183 | } | |
184 | ||
185 | /* drm_dma.h hooks | |
186 | */ | |
187 | void i915_driver_irq_preinstall(drm_device_t * dev) | |
188 | { | |
189 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
190 | ||
191 | I915_WRITE16(I915REG_HWSTAM, 0xfffe); | |
192 | I915_WRITE16(I915REG_INT_MASK_R, 0x0); | |
193 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
194 | } | |
195 | ||
196 | void i915_driver_irq_postinstall(drm_device_t * dev) | |
197 | { | |
198 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
199 | ||
0d6aa60b | 200 | I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | VSYNC_PIPEA_FLAG); |
1da177e4 LT |
201 | DRM_INIT_WAITQUEUE(&dev_priv->irq_queue); |
202 | } | |
203 | ||
204 | void i915_driver_irq_uninstall(drm_device_t * dev) | |
205 | { | |
206 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
91e3738e DA |
207 | u16 temp; |
208 | ||
1da177e4 LT |
209 | if (!dev_priv) |
210 | return; | |
211 | ||
212 | I915_WRITE16(I915REG_HWSTAM, 0xffff); | |
213 | I915_WRITE16(I915REG_INT_MASK_R, 0xffff); | |
214 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
91e3738e DA |
215 | |
216 | temp = I915_READ16(I915REG_INT_IDENTITY_R); | |
217 | I915_WRITE16(I915REG_INT_IDENTITY_R, temp); | |
1da177e4 | 218 | } |