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   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 "drmP.h"
  30 #include "drm.h"
  31 #include "i915_drm.h"
  32 #include "i915_drv.h"
  33
  34 #define USER_INT_FLAG (1<<1)
  35 #define VSYNC_PIPEB_FLAG (1<<5)
  36 #define VSYNC_PIPEA_FLAG (1<<7)
  37
  38 #define MAX_NOPID ((u32)~0)
  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);
  47         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG);
  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);
  55
  56         if (temp & USER_INT_FLAG)
  57                 DRM_WAKEUP(&dev_priv->irq_queue);
  58
  59         if (temp & VSYNC_PIPEA_FLAG) {
  60                 atomic_inc(&dev->vbl_received);
  61                 DRM_WAKEUP(&dev->vbl_queue);
  62                 drm_vbl_send_signals(dev);
  63         }
  64
  65         return IRQ_HANDLED;
  66 }
  67
  68 static int i915_emit_irq(drm_device_t * dev)
  69 {
  70         drm_i915_private_t *dev_priv = dev->dev_private;
  71         u32 ret;
  72         RING_LOCALS;
  73
  74         i915_kernel_lost_context(dev);
  75
  76         DRM_DEBUG("%s\n", __FUNCTION__);
  77
  78         ret = dev_priv->counter;
  79
  80         BEGIN_LP_RING(2);
  81         OUT_RING(0);
  82         OUT_RING(GFX_OP_USER_INTERRUPT);
  83         ADVANCE_LP_RING();
  84
  85         return ret;
  86 }
  87
  88 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
  89 {
  90         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  91         int ret = 0;
  92
  93         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
  94                   READ_BREADCRUMB(dev_priv));
  95
  96         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
  97                 return 0;
  98
  99         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 100
 101         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 102                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 103
 104         if (ret == DRM_ERR(EBUSY)) {
 105                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 106                           __FUNCTION__,
 107                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 108         }
 109
 110         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 111         return ret;
 112 }
 113
 114 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 115 {
 116         drm_i915_private_t *dev_priv = dev->dev_private;
 117         unsigned int cur_vblank;
 118         int ret = 0;
 119
 120         if (!dev_priv) {
 121                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 122                 return DRM_ERR(EINVAL);
 123         }
 124
 125         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 126                     (((cur_vblank = atomic_read(&dev->vbl_received))
 127                         - *sequence) <= (1<<23)));
 128
 129         *sequence = cur_vblank;
 130
 131         return ret;
 132 }
 133
 134
 135 /* Needs the lock as it touches the ring.
 136  */
 137 int i915_irq_emit(DRM_IOCTL_ARGS)
 138 {
 139         DRM_DEVICE;
 140         drm_i915_private_t *dev_priv = dev->dev_private;
 141         drm_i915_irq_emit_t emit;
 142         int result;
 143
 144         LOCK_TEST_WITH_RETURN(dev, filp);
 145
 146         if (!dev_priv) {
 147                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 148                 return DRM_ERR(EINVAL);
 149         }
 150
 151         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 152                                  sizeof(emit));
 153
 154         result = i915_emit_irq(dev);
 155
 156         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 157                 DRM_ERROR("copy_to_user\n");
 158                 return DRM_ERR(EFAULT);
 159         }
 160
 161         return 0;
 162 }
 163
 164 /* Doesn't need the hardware lock.
 165  */
 166 int i915_irq_wait(DRM_IOCTL_ARGS)
 167 {
 168         DRM_DEVICE;
 169         drm_i915_private_t *dev_priv = dev->dev_private;
 170         drm_i915_irq_wait_t irqwait;
 171
 172         if (!dev_priv) {
 173                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 174                 return DRM_ERR(EINVAL);
 175         }
 176
 177         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 178                                  sizeof(irqwait));
 179
 180         return i915_wait_irq(dev, irqwait.irq_seq);
 181 }
 182
 183 /* drm_dma.h hooks
 184 */
 185 void i915_driver_irq_preinstall(drm_device_t * dev)
 186 {
 187         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 188
 189         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 190         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 191         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 192 }
 193
 194 void i915_driver_irq_postinstall(drm_device_t * dev)
 195 {
 196         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 197
 198         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | VSYNC_PIPEA_FLAG);
 199         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 200 }
 201
 202 void i915_driver_irq_uninstall(drm_device_t * dev)
 203 {
 204         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 205         if (!dev_priv)
 206                 return;
 207
 208         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 209         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 210         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 211 }