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1da177e4 LT |
1 | /* i915_dma.c -- DMA support for the I915 -*- linux-c -*- |
2 | */ | |
3 | /************************************************************************** | |
4 | * | |
5 | * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. | |
6 | * All Rights Reserved. | |
7 | * | |
8 | **************************************************************************/ | |
9 | ||
10 | #include "drmP.h" | |
11 | #include "drm.h" | |
12 | #include "i915_drm.h" | |
13 | #include "i915_drv.h" | |
14 | ||
15 | #define USER_INT_FLAG 0x2 | |
16 | #define MAX_NOPID ((u32)~0) | |
17 | #define READ_BREADCRUMB(dev_priv) (((u32*)(dev_priv->hw_status_page))[5]) | |
18 | ||
19 | irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS) | |
20 | { | |
21 | drm_device_t *dev = (drm_device_t *) arg; | |
22 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
23 | u16 temp; | |
24 | ||
25 | temp = I915_READ16(I915REG_INT_IDENTITY_R); | |
26 | temp &= USER_INT_FLAG; | |
27 | ||
28 | DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp); | |
29 | ||
30 | if (temp == 0) | |
31 | return IRQ_NONE; | |
32 | ||
33 | I915_WRITE16(I915REG_INT_IDENTITY_R, temp); | |
34 | DRM_WAKEUP(&dev_priv->irq_queue); | |
35 | ||
36 | return IRQ_HANDLED; | |
37 | } | |
38 | ||
39 | int i915_emit_irq(drm_device_t * dev) | |
40 | { | |
41 | drm_i915_private_t *dev_priv = dev->dev_private; | |
42 | u32 ret; | |
43 | RING_LOCALS; | |
44 | ||
45 | i915_kernel_lost_context(dev); | |
46 | ||
47 | DRM_DEBUG("%s\n", __FUNCTION__); | |
48 | ||
49 | ret = dev_priv->counter; | |
50 | ||
51 | BEGIN_LP_RING(2); | |
52 | OUT_RING(0); | |
53 | OUT_RING(GFX_OP_USER_INTERRUPT); | |
54 | ADVANCE_LP_RING(); | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | int i915_wait_irq(drm_device_t * dev, int irq_nr) | |
60 | { | |
61 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
62 | int ret = 0; | |
63 | ||
64 | DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr, | |
65 | READ_BREADCRUMB(dev_priv)); | |
66 | ||
67 | if (READ_BREADCRUMB(dev_priv) >= irq_nr) | |
68 | return 0; | |
69 | ||
70 | dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; | |
71 | ||
72 | DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ, | |
73 | READ_BREADCRUMB(dev_priv) >= irq_nr); | |
74 | ||
75 | if (ret == DRM_ERR(EBUSY)) { | |
76 | DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n", | |
77 | __FUNCTION__, | |
78 | READ_BREADCRUMB(dev_priv), (int)dev_priv->counter); | |
79 | } | |
80 | ||
81 | dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv); | |
82 | return ret; | |
83 | } | |
84 | ||
85 | /* Needs the lock as it touches the ring. | |
86 | */ | |
87 | int i915_irq_emit(DRM_IOCTL_ARGS) | |
88 | { | |
89 | DRM_DEVICE; | |
90 | drm_i915_private_t *dev_priv = dev->dev_private; | |
91 | drm_i915_irq_emit_t emit; | |
92 | int result; | |
93 | ||
94 | LOCK_TEST_WITH_RETURN(dev, filp); | |
95 | ||
96 | if (!dev_priv) { | |
97 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
98 | return DRM_ERR(EINVAL); | |
99 | } | |
100 | ||
101 | DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data, | |
102 | sizeof(emit)); | |
103 | ||
104 | result = i915_emit_irq(dev); | |
105 | ||
106 | if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) { | |
107 | DRM_ERROR("copy_to_user\n"); | |
108 | return DRM_ERR(EFAULT); | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | /* Doesn't need the hardware lock. | |
115 | */ | |
116 | int i915_irq_wait(DRM_IOCTL_ARGS) | |
117 | { | |
118 | DRM_DEVICE; | |
119 | drm_i915_private_t *dev_priv = dev->dev_private; | |
120 | drm_i915_irq_wait_t irqwait; | |
121 | ||
122 | if (!dev_priv) { | |
123 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
124 | return DRM_ERR(EINVAL); | |
125 | } | |
126 | ||
127 | DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data, | |
128 | sizeof(irqwait)); | |
129 | ||
130 | return i915_wait_irq(dev, irqwait.irq_seq); | |
131 | } | |
132 | ||
133 | /* drm_dma.h hooks | |
134 | */ | |
135 | void i915_driver_irq_preinstall(drm_device_t * dev) | |
136 | { | |
137 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
138 | ||
139 | I915_WRITE16(I915REG_HWSTAM, 0xfffe); | |
140 | I915_WRITE16(I915REG_INT_MASK_R, 0x0); | |
141 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
142 | } | |
143 | ||
144 | void i915_driver_irq_postinstall(drm_device_t * dev) | |
145 | { | |
146 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
147 | ||
148 | I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG); | |
149 | DRM_INIT_WAITQUEUE(&dev_priv->irq_queue); | |
150 | } | |
151 | ||
152 | void i915_driver_irq_uninstall(drm_device_t * dev) | |
153 | { | |
154 | drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; | |
155 | if (!dev_priv) | |
156 | return; | |
157 | ||
158 | I915_WRITE16(I915REG_HWSTAM, 0xffff); | |
159 | I915_WRITE16(I915REG_INT_MASK_R, 0xffff); | |
160 | I915_WRITE16(I915REG_INT_ENABLE_R, 0x0); | |
161 | } |