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1da177e4 LT |
1 | /* i915_dma.c -- DMA support for the I915 -*- linux-c -*- |
2 | */ | |
3 | /************************************************************************** | |
bc54fd1a | 4 | * |
1da177e4 LT |
5 | * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. |
6 | * All Rights Reserved. | |
bc54fd1a DA |
7 | * |
8 | * Permission is hereby granted, free of charge, to any person obtaining a | |
9 | * copy of this software and associated documentation files (the | |
10 | * "Software"), to deal in the Software without restriction, including | |
11 | * without limitation the rights to use, copy, modify, merge, publish, | |
12 | * distribute, sub license, and/or sell copies of the Software, and to | |
13 | * permit persons to whom the Software is furnished to do so, subject to | |
14 | * the following conditions: | |
15 | * | |
16 | * The above copyright notice and this permission notice (including the | |
17 | * next paragraph) shall be included in all copies or substantial portions | |
18 | * of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
21 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
22 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. | |
23 | * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR | |
24 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
25 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
26 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
27 | * | |
1da177e4 LT |
28 | **************************************************************************/ |
29 | ||
30 | #include "drmP.h" | |
31 | #include "drm.h" | |
32 | #include "i915_drm.h" | |
33 | #include "i915_drv.h" | |
34 | ||
35 | #define USER_INT_FLAG 0x2 | |
36 | #define MAX_NOPID ((u32)~0) | |
37 | #define READ_BREADCRUMB(dev_priv) (((u32*)(dev_priv->hw_status_page))[5]) | |
38 | ||
39 | irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS) | |
40 | { | |
41 | drm_device_t *dev = (drm_device_t *) arg; | |
42 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
43 | u16 temp; | |
44 | ||
45 | temp = I915_READ16(I915REG_INT_IDENTITY_R); | |
46 | temp &= USER_INT_FLAG; | |
47 | ||
48 | DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp); | |
49 | ||
50 | if (temp == 0) | |
51 | return IRQ_NONE; | |
52 | ||
53 | I915_WRITE16(I915REG_INT_IDENTITY_R, temp); | |
54 | DRM_WAKEUP(&dev_priv->irq_queue); | |
55 | ||
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
c94f7029 | 59 | static int i915_emit_irq(drm_device_t * dev) |
1da177e4 LT |
60 | { |
61 | drm_i915_private_t *dev_priv = dev->dev_private; | |
62 | u32 ret; | |
63 | RING_LOCALS; | |
64 | ||
65 | i915_kernel_lost_context(dev); | |
66 | ||
67 | DRM_DEBUG("%s\n", __FUNCTION__); | |
68 | ||
69 | ret = dev_priv->counter; | |
70 | ||
71 | BEGIN_LP_RING(2); | |
72 | OUT_RING(0); | |
73 | OUT_RING(GFX_OP_USER_INTERRUPT); | |
74 | ADVANCE_LP_RING(); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
c94f7029 | 79 | static int i915_wait_irq(drm_device_t * dev, int irq_nr) |
1da177e4 LT |
80 | { |
81 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
82 | int ret = 0; | |
83 | ||
84 | DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr, | |
85 | READ_BREADCRUMB(dev_priv)); | |
86 | ||
87 | if (READ_BREADCRUMB(dev_priv) >= irq_nr) | |
88 | return 0; | |
89 | ||
90 | dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; | |
91 | ||
92 | DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ, | |
93 | READ_BREADCRUMB(dev_priv) >= irq_nr); | |
94 | ||
95 | if (ret == DRM_ERR(EBUSY)) { | |
96 | DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n", | |
97 | __FUNCTION__, | |
98 | READ_BREADCRUMB(dev_priv), (int)dev_priv->counter); | |
99 | } | |
100 | ||
101 | dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* Needs the lock as it touches the ring. | |
106 | */ | |
107 | int i915_irq_emit(DRM_IOCTL_ARGS) | |
108 | { | |
109 | DRM_DEVICE; | |
110 | drm_i915_private_t *dev_priv = dev->dev_private; | |
111 | drm_i915_irq_emit_t emit; | |
112 | int result; | |
113 | ||
114 | LOCK_TEST_WITH_RETURN(dev, filp); | |
115 | ||
116 | if (!dev_priv) { | |
117 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
118 | return DRM_ERR(EINVAL); | |
119 | } | |
120 | ||
121 | DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data, | |
122 | sizeof(emit)); | |
123 | ||
124 | result = i915_emit_irq(dev); | |
125 | ||
126 | if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) { | |
127 | DRM_ERROR("copy_to_user\n"); | |
128 | return DRM_ERR(EFAULT); | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | /* Doesn't need the hardware lock. | |
135 | */ | |
136 | int i915_irq_wait(DRM_IOCTL_ARGS) | |
137 | { | |
138 | DRM_DEVICE; | |
139 | drm_i915_private_t *dev_priv = dev->dev_private; | |
140 | drm_i915_irq_wait_t irqwait; | |
141 | ||
142 | if (!dev_priv) { | |
143 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
144 | return DRM_ERR(EINVAL); | |
145 | } | |
146 | ||
147 | DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data, | |
148 | sizeof(irqwait)); | |
149 | ||
150 | return i915_wait_irq(dev, irqwait.irq_seq); | |
151 | } | |
152 | ||
153 | /* drm_dma.h hooks | |
154 | */ | |
155 | void i915_driver_irq_preinstall(drm_device_t * dev) | |
156 | { | |
157 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
158 | ||
159 | I915_WRITE16(I915REG_HWSTAM, 0xfffe); | |
160 | I915_WRITE16(I915REG_INT_MASK_R, 0x0); | |
161 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
162 | } | |
163 | ||
164 | void i915_driver_irq_postinstall(drm_device_t * dev) | |
165 | { | |
166 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
167 | ||
168 | I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG); | |
169 | DRM_INIT_WAITQUEUE(&dev_priv->irq_queue); | |
170 | } | |
171 | ||
172 | void i915_driver_irq_uninstall(drm_device_t * dev) | |
173 | { | |
174 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
175 | if (!dev_priv) | |
176 | return; | |
177 | ||
178 | I915_WRITE16(I915REG_HWSTAM, 0xffff); | |
179 | I915_WRITE16(I915REG_INT_MASK_R, 0xffff); | |
180 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
181 | } |