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
  48         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_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
  57         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
  58
  59         if (temp & USER_INT_FLAG)
  60                 DRM_WAKEUP(&dev_priv->irq_queue);
  61
  62         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
  63                 atomic_inc(&dev->vbl_received);
  64                 DRM_WAKEUP(&dev->vbl_queue);
  65                 drm_vbl_send_signals(dev);
  66         }
  67
  68         return IRQ_HANDLED;
  69 }
  70
  71 static int i915_emit_irq(drm_device_t * dev)
  72 {
  73         drm_i915_private_t *dev_priv = dev->dev_private;
  74         u32 ret;
  75         RING_LOCALS;
  76
  77         i915_kernel_lost_context(dev);
  78
  79         DRM_DEBUG("%s\n", __FUNCTION__);
  80
  81         ret = dev_priv->counter;
  82
  83         BEGIN_LP_RING(2);
  84         OUT_RING(0);
  85         OUT_RING(GFX_OP_USER_INTERRUPT);
  86         ADVANCE_LP_RING();
  87
  88         return ret;
  89 }
  90
  91 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
  92 {
  93         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  94         int ret = 0;
  95
  96         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
  97                   READ_BREADCRUMB(dev_priv));
  98
  99         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 100                 return 0;
 101
 102         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 103
 104         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 105                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 106
 107         if (ret == DRM_ERR(EBUSY)) {
 108                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 109                           __FUNCTION__,
 110                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 111         }
 112
 113         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 114         return ret;
 115 }
 116
 117 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 118 {
 119         drm_i915_private_t *dev_priv = dev->dev_private;
 120         unsigned int cur_vblank;
 121         int ret = 0;
 122
 123         if (!dev_priv) {
 124                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 125                 return DRM_ERR(EINVAL);
 126         }
 127
 128         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 129                     (((cur_vblank = atomic_read(&dev->vbl_received))
 130                         - *sequence) <= (1<<23)));
 131
 132         *sequence = cur_vblank;
 133
 134         return ret;
 135 }
 136
 137
 138 /* Needs the lock as it touches the ring.
 139  */
 140 int i915_irq_emit(DRM_IOCTL_ARGS)
 141 {
 142         DRM_DEVICE;
 143         drm_i915_private_t *dev_priv = dev->dev_private;
 144         drm_i915_irq_emit_t emit;
 145         int result;
 146
 147         LOCK_TEST_WITH_RETURN(dev, filp);
 148
 149         if (!dev_priv) {
 150                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 151                 return DRM_ERR(EINVAL);
 152         }
 153
 154         DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
 155                                  sizeof(emit));
 156
 157         result = i915_emit_irq(dev);
 158
 159         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 160                 DRM_ERROR("copy_to_user\n");
 161                 return DRM_ERR(EFAULT);
 162         }
 163
 164         return 0;
 165 }
 166
 167 /* Doesn't need the hardware lock.
 168  */
 169 int i915_irq_wait(DRM_IOCTL_ARGS)
 170 {
 171         DRM_DEVICE;
 172         drm_i915_private_t *dev_priv = dev->dev_private;
 173         drm_i915_irq_wait_t irqwait;
 174
 175         if (!dev_priv) {
 176                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 177                 return DRM_ERR(EINVAL);
 178         }
 179
 180         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 181                                  sizeof(irqwait));
 182
 183         return i915_wait_irq(dev, irqwait.irq_seq);
 184 }
 185
 186 static int i915_enable_interrupt (drm_device_t *dev)
 187 {
 188         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 189         u16 flag;
 190
 191         flag = 0;
 192         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 193                 flag |= VSYNC_PIPEA_FLAG;
 194         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 195                 flag |= VSYNC_PIPEB_FLAG;
 196         if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 197                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
 198                           __FUNCTION__, dev_priv->vblank_pipe);
 199                 return DRM_ERR(EINVAL);
 200         }
 201         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 202         return 0;
 203 }
 204
 205 /* Set the vblank monitor pipe
 206  */
 207 int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
 208 {
 209         DRM_DEVICE;
 210         drm_i915_private_t *dev_priv = dev->dev_private;
 211         drm_i915_vblank_pipe_t pipe;
 212
 213         if (!dev_priv) {
 214                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 215                 return DRM_ERR(EINVAL);
 216         }
 217
 218         DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
 219                                  sizeof(pipe));
 220
 221         dev_priv->vblank_pipe = pipe.pipe;
 222         return i915_enable_interrupt (dev);
 223 }
 224
 225 int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
 226 {
 227         DRM_DEVICE;
 228         drm_i915_private_t *dev_priv = dev->dev_private;
 229         drm_i915_vblank_pipe_t pipe;
 230         u16 flag;
 231
 232         if (!dev_priv) {
 233                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 234                 return DRM_ERR(EINVAL);
 235         }
 236
 237         flag = I915_READ(I915REG_INT_ENABLE_R);
 238         pipe.pipe = 0;
 239         if (flag & VSYNC_PIPEA_FLAG)
 240                 pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
 241         if (flag & VSYNC_PIPEB_FLAG)
 242                 pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
 243         DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
 244                                  sizeof(pipe));
 245         return 0;
 246 }
 247
 248 /* drm_dma.h hooks
 249 */
 250 void i915_driver_irq_preinstall(drm_device_t * dev)
 251 {
 252         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 253
 254         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 255         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 256         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 257 }
 258
 259 void i915_driver_irq_postinstall(drm_device_t * dev)
 260 {
 261         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 262
 263         i915_enable_interrupt(dev);
 264         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 265 }
 266
 267 void i915_driver_irq_uninstall(drm_device_t * dev)
 268 {
 269         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 270         u16 temp;
 271
 272         if (!dev_priv)
 273                 return;
 274
 275         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 276         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 277         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 278
 279         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 280         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 281 }