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                 if ((dev_priv->vblank_pipe &
  64                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
  65                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
  66                         if (temp & VSYNC_PIPEA_FLAG)
  67                                 atomic_inc(&dev->vbl_received);
  68                         if (temp & VSYNC_PIPEB_FLAG)
  69                                 atomic_inc(&dev->vbl_received2);
  70                 } else
  71                         atomic_inc(&dev->vbl_received);
  72
  73                 DRM_WAKEUP(&dev->vbl_queue);
  74                 drm_vbl_send_signals(dev);
  75         }
  76
  77         return IRQ_HANDLED;
  78 }
  79
  80 static int i915_emit_irq(drm_device_t * dev)
  81 {
  82         drm_i915_private_t *dev_priv = dev->dev_private;
  83         RING_LOCALS;
  84
  85         i915_kernel_lost_context(dev);
  86
  87         DRM_DEBUG("%s\n", __FUNCTION__);
  88
  89         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
  90
  91         if (dev_priv->counter > 0x7FFFFFFFUL)
  92                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
  93
  94         BEGIN_LP_RING(6);
  95         OUT_RING(CMD_STORE_DWORD_IDX);
  96         OUT_RING(20);
  97         OUT_RING(dev_priv->counter);
  98         OUT_RING(0);
  99         OUT_RING(0);
 100         OUT_RING(GFX_OP_USER_INTERRUPT);
 101         ADVANCE_LP_RING();
 102
 103         return dev_priv->counter;
 104 }
 105
 106 static int i915_wait_irq(drm_device_t * dev, int irq_nr)
 107 {
 108         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 109         int ret = 0;
 110
 111         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
 112                   READ_BREADCRUMB(dev_priv));
 113
 114         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 115                 return 0;
 116
 117         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 118
 119         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 120                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 121
 122         if (ret == DRM_ERR(EBUSY)) {
 123                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 124                           __FUNCTION__,
 125                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 126         }
 127
 128         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 129         return ret;
 130 }
 131
 132 static int i915_driver_vblank_do_wait(drm_device_t *dev, unsigned int *sequence,
 133                                       atomic_t *counter)
 134 {
 135         drm_i915_private_t *dev_priv = dev->dev_private;
 136         unsigned int cur_vblank;
 137         int ret = 0;
 138
 139         if (!dev_priv) {
 140                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 141                 return DRM_ERR(EINVAL);
 142         }
 143
 144         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 145                     (((cur_vblank = atomic_read(counter))
 146                         - *sequence) <= (1<<23)));
 147
 148         *sequence = cur_vblank;
 149
 150         return ret;
 151 }
 152
 153
 154 int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 155 {
 156         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
 157 }
 158
 159 int i915_driver_vblank_wait2(drm_device_t *dev, unsigned int *sequence)
 160 {
 161         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
 162 }
 163
 164 /* Needs the lock as it touches the ring.
 165  */
 166 int i915_irq_emit(DRM_IOCTL_ARGS)
 167 {
 168         DRM_DEVICE;
 169         drm_i915_private_t *dev_priv = dev->dev_private;
 170         drm_i915_irq_emit_t emit;
 171         int result;
 172
 173         LOCK_TEST_WITH_RETURN(dev, filp);
 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(emit, (drm_i915_irq_emit_t __user *) data,
 181                                  sizeof(emit));
 182
 183         result = i915_emit_irq(dev);
 184
 185         if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
 186                 DRM_ERROR("copy_to_user\n");
 187                 return DRM_ERR(EFAULT);
 188         }
 189
 190         return 0;
 191 }
 192
 193 /* Doesn't need the hardware lock.
 194  */
 195 int i915_irq_wait(DRM_IOCTL_ARGS)
 196 {
 197         DRM_DEVICE;
 198         drm_i915_private_t *dev_priv = dev->dev_private;
 199         drm_i915_irq_wait_t irqwait;
 200
 201         if (!dev_priv) {
 202                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 203                 return DRM_ERR(EINVAL);
 204         }
 205
 206         DRM_COPY_FROM_USER_IOCTL(irqwait, (drm_i915_irq_wait_t __user *) data,
 207                                  sizeof(irqwait));
 208
 209         return i915_wait_irq(dev, irqwait.irq_seq);
 210 }
 211
 212 static int i915_enable_interrupt (drm_device_t *dev)
 213 {
 214         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 215         u16 flag;
 216
 217         flag = 0;
 218         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 219                 flag |= VSYNC_PIPEA_FLAG;
 220         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 221                 flag |= VSYNC_PIPEB_FLAG;
 222         if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 223                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
 224                           __FUNCTION__, dev_priv->vblank_pipe);
 225                 return DRM_ERR(EINVAL);
 226         }
 227         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 228         return 0;
 229 }
 230
 231 /* Set the vblank monitor pipe
 232  */
 233 int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
 234 {
 235         DRM_DEVICE;
 236         drm_i915_private_t *dev_priv = dev->dev_private;
 237         drm_i915_vblank_pipe_t pipe;
 238
 239         if (!dev_priv) {
 240                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 241                 return DRM_ERR(EINVAL);
 242         }
 243
 244         DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
 245                                  sizeof(pipe));
 246
 247         dev_priv->vblank_pipe = pipe.pipe;
 248         return i915_enable_interrupt (dev);
 249 }
 250
 251 int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
 252 {
 253         DRM_DEVICE;
 254         drm_i915_private_t *dev_priv = dev->dev_private;
 255         drm_i915_vblank_pipe_t pipe;
 256         u16 flag;
 257
 258         if (!dev_priv) {
 259                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 260                 return DRM_ERR(EINVAL);
 261         }
 262
 263         flag = I915_READ(I915REG_INT_ENABLE_R);
 264         pipe.pipe = 0;
 265         if (flag & VSYNC_PIPEA_FLAG)
 266                 pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
 267         if (flag & VSYNC_PIPEB_FLAG)
 268                 pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
 269         DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
 270                                  sizeof(pipe));
 271         return 0;
 272 }
 273
 274 /* drm_dma.h hooks
 275 */
 276 void i915_driver_irq_preinstall(drm_device_t * dev)
 277 {
 278         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 279
 280         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 281         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 282         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 283 }
 284
 285 void i915_driver_irq_postinstall(drm_device_t * dev)
 286 {
 287         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 288
 289         i915_enable_interrupt(dev);
 290         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 291 }
 292
 293 void i915_driver_irq_uninstall(drm_device_t * dev)
 294 {
 295         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 296         u16 temp;
 297
 298         if (!dev_priv)
 299                 return;
 300
 301         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 302         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 303         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 304
 305         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 306         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 307 }