drivers/char/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 "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         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
  57
  58         if (temp & USER_INT_FLAG)
  59                 DRM_WAKEUP(&dev_priv->irq_queue);
  60
  61         if (temp & VSYNC_PIPEA_FLAG) {
  62                 atomic_inc(&dev->vbl_received);
  63                 DRM_WAKEUP(&dev->vbl_queue);
  64                 drm_vbl_send_signals(dev);
  65         }
  66
  67         return IRQ_HANDLED;
  68 }
  69
  70 static int i915_emit_irq(drm_device_t * dev)
  71 {
  72         drm_i915_private_t *dev_priv = dev->dev_private;
  73         u32 ret;
  74         RING_LOCALS;
  75
  76         i915_kernel_lost_context(dev);
  77
  78         DRM_DEBUG("%s\n", __FUNCTION__);
  79
  80         ret = dev_priv->counter;
  81
  82         BEGIN_LP_RING(2);
  83         OUT_RING(0);
  84         OUT_RING(GFX_OP_USER_INTERRUPT);
  85         ADVANCE_LP_RING();
  86
  87         return ret;
  88 }
  89
  90 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
  91 {
  92         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  93         int ret = 0;
  94
  95         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
  96                   READ_BREADCRUMB(dev_priv));
  97
  98         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
  99                 return 0;
 100
 101         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 102
 103         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 104                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 105
 106         if (ret == DRM_ERR(EBUSY)) {
 107                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 108                           __FUNCTION__,
 109                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 110         }
 111
 112         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 113         return ret;
 114 }
 115
 116 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 117 {
 118         drm_i915_private_t *dev_priv = dev->dev_private;
 119         unsigned int cur_vblank;
 120         int ret = 0;
 121
 122         if (!dev_priv) {
 123                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 124                 return DRM_ERR(EINVAL);
 125         }
 126
 127         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 128                     (((cur_vblank = atomic_read(&dev->vbl_received))
 129                         - *sequence) <= (1<<23)));
 130
 131         *sequence = cur_vblank;
 132
 133         return ret;
 134 }
 135
 136
 137 /* Needs the lock as it touches the ring.
 138  */
 139 int i915_irq_emit(DRM_IOCTL_ARGS)
 140 {
 141         DRM_DEVICE;
 142         drm_i915_private_t *dev_priv = dev->dev_private;
 143         drm_i915_irq_emit_t emit;
 144         int result;
 145
 146         LOCK_TEST_WITH_RETURN(dev, filp);
 147
 148         if (!dev_priv) {
 149                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 150                 return DRM_ERR(EINVAL);
 151         }
 152
 153         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 154                                  sizeof(emit));
 155
 156         result = i915_emit_irq(dev);
 157
 158         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 159                 DRM_ERROR("copy_to_user\n");
 160                 return DRM_ERR(EFAULT);
 161         }
 162
 163         return 0;
 164 }
 165
 166 /* Doesn't need the hardware lock.
 167  */
 168 int i915_irq_wait(DRM_IOCTL_ARGS)
 169 {
 170         DRM_DEVICE;
 171         drm_i915_private_t *dev_priv = dev->dev_private;
 172         drm_i915_irq_wait_t irqwait;
 173
 174         if (!dev_priv) {
 175                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 176                 return DRM_ERR(EINVAL);
 177         }
 178
 179         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 180                                  sizeof(irqwait));
 181
 182         return i915_wait_irq(dev, irqwait.irq_seq);
 183 }
 184
 185 /* drm_dma.h hooks
 186 */
 187 void i915_driver_irq_preinstall(drm_device_t * dev)
 188 {
 189         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 190
 191         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 192         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 193         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 194 }
 195
 196 void i915_driver_irq_postinstall(drm_device_t * dev)
 197 {
 198         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 199
 200         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | VSYNC_PIPEA_FLAG);
 201         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 202 }
 203
 204 void i915_driver_irq_uninstall(drm_device_t * dev)
 205 {
 206         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 207         u16 temp;
 208
 209         if (!dev_priv)
 210                 return;
 211
 212         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 213         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 214         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 215
 216         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 217         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 218 }