sys/dev/drm/i915_irq.c

   1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2  */
   3 /*-
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   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  *
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "dev/drm/drmP.h"
  33 #include "dev/drm/drm.h"
  34 #include "dev/drm/i915_drm.h"
  35 #include "dev/drm/i915_drv.h"
  36
  37 #define USER_INT_FLAG 0x2
  38 #define MAX_NOPID ((u32)~0)
  39 #define READ_BREADCRUMB(dev_priv)  (((u32*)(dev_priv->hw_status_page))[5])
  40
  41 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
  42 {
  43         drm_device_t *dev = (drm_device_t *) arg;
  44         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  45         u16 temp;
  46
  47         temp = I915_READ16(I915REG_INT_IDENTITY_R);
  48         temp &= USER_INT_FLAG;
  49
  50         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
  51
  52         if (temp == 0)
  53                 return IRQ_NONE;
  54
  55         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
  56         DRM_WAKEUP(&dev_priv->irq_queue);
  57
  58         return IRQ_HANDLED;
  59 }
  60
  61 static int i915_emit_irq(drm_device_t * dev)
  62 {
  63         drm_i915_private_t *dev_priv = dev->dev_private;
  64         u32 ret;
  65         RING_LOCALS;
  66
  67         i915_kernel_lost_context(dev);
  68
  69         DRM_DEBUG("%s\n", __FUNCTION__);
  70
  71         ret = dev_priv->counter;
  72
  73         BEGIN_LP_RING(2);
  74         OUT_RING(0);
  75         OUT_RING(GFX_OP_USER_INTERRUPT);
  76         ADVANCE_LP_RING();
  77
  78         return ret;
  79 }
  80
  81 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
  82 {
  83         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  84         int ret = 0;
  85
  86         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
  87                   READ_BREADCRUMB(dev_priv));
  88
  89         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
  90                 return 0;
  91
  92         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
  93
  94         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
  95                     READ_BREADCRUMB(dev_priv) >= irq_nr);
  96
  97         if (ret == DRM_ERR(EBUSY)) {
  98                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
  99                           __FUNCTION__,
 100                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 101         }
 102
 103         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 104         return ret;
 105 }
 106
 107 /* Needs the lock as it touches the ring.
 108  */
 109 int i915_irq_emit(DRM_IOCTL_ARGS)
 110 {
 111         DRM_DEVICE;
 112         drm_i915_private_t *dev_priv = dev->dev_private;
 113         drm_i915_irq_emit_t emit;
 114         int result;
 115
 116         LOCK_TEST_WITH_RETURN(dev, filp);
 117
 118         if (!dev_priv) {
 119                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 120                 return DRM_ERR(EINVAL);
 121         }
 122
 123         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 124                                  sizeof(emit));
 125
 126         result = i915_emit_irq(dev);
 127
 128         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 129                 DRM_ERROR("copy_to_user\n");
 130                 return DRM_ERR(EFAULT);
 131         }
 132
 133         return 0;
 134 }
 135
 136 /* Doesn't need the hardware lock.
 137  */
 138 int i915_irq_wait(DRM_IOCTL_ARGS)
 139 {
 140         DRM_DEVICE;
 141         drm_i915_private_t *dev_priv = dev->dev_private;
 142         drm_i915_irq_wait_t irqwait;
 143
 144         if (!dev_priv) {
 145                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 146                 return DRM_ERR(EINVAL);
 147         }
 148
 149         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 150                                  sizeof(irqwait));
 151
 152         return i915_wait_irq(dev, irqwait.irq_seq);
 153 }
 154
 155 /* drm_dma.h hooks
 156 */
 157 void i915_driver_irq_preinstall(drm_device_t * dev)
 158 {
 159         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 160
 161         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 162         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 163         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 164 }
 165
 166 void i915_driver_irq_postinstall(drm_device_t * dev)
 167 {
 168         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 169
 170         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG);
 171         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 172 }
 173
 174 void i915_driver_irq_uninstall(drm_device_t * dev)
 175 {
 176         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 177         if (!dev_priv)
 178                 return;
 179
 180         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 181         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 182         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 183 }