1 /* i915_dma.c -- DMA support for the I915 -*- linux-c -*-
5 /**************************************************************************
7 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
10 **************************************************************************/
17 #define USER_INT_FLAG 0x2
18 #define MAX_NOPID ((u32)~0)
19 #define READ_BREADCRUMB(dev_priv) (((u32*)(dev_priv->hw_status_page))[5])
21 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
23 drm_device_t *dev = (drm_device_t *) arg;
24 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
27 temp = I915_READ16(I915REG_INT_IDENTITY_R);
28 temp &= USER_INT_FLAG;
30 DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
35 I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
36 DRM_WAKEUP(&dev_priv->irq_queue);
41 static int i915_emit_irq(drm_device_t * dev)
43 drm_i915_private_t *dev_priv = dev->dev_private;
47 i915_kernel_lost_context(dev);
49 DRM_DEBUG("%s\n", __FUNCTION__);
51 ret = dev_priv->counter;
55 OUT_RING(GFX_OP_USER_INTERRUPT);
61 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
63 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
66 DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
67 READ_BREADCRUMB(dev_priv));
69 if (READ_BREADCRUMB(dev_priv) >= irq_nr)
72 dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
74 DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
75 READ_BREADCRUMB(dev_priv) >= irq_nr);
77 if (ret == DRM_ERR(EBUSY)) {
78 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
80 READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
83 dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
87 /* Needs the lock as it touches the ring.
89 int i915_irq_emit(DRM_IOCTL_ARGS)
92 drm_i915_private_t *dev_priv = dev->dev_private;
93 drm_i915_irq_emit_t emit;
96 LOCK_TEST_WITH_RETURN(dev, filp);
99 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
100 return DRM_ERR(EINVAL);
103 DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
106 result = i915_emit_irq(dev);
108 if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
109 DRM_ERROR("copy_to_user\n");
110 return DRM_ERR(EFAULT);
116 /* Doesn't need the hardware lock.
118 int i915_irq_wait(DRM_IOCTL_ARGS)
121 drm_i915_private_t *dev_priv = dev->dev_private;
122 drm_i915_irq_wait_t irqwait;
125 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
126 return DRM_ERR(EINVAL);
129 DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
132 return i915_wait_irq(dev, irqwait.irq_seq);
137 void i915_driver_irq_preinstall(drm_device_t * dev)
139 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
141 I915_WRITE16(I915REG_HWSTAM, 0xfffe);
142 I915_WRITE16(I915REG_INT_MASK_R, 0x0);
143 I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
146 void i915_driver_irq_postinstall(drm_device_t * dev)
148 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
150 I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG);
151 DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
154 void i915_driver_irq_uninstall(drm_device_t * dev)
156 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
160 I915_WRITE16(I915REG_HWSTAM, 0xffff);
161 I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
162 I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);