git.oblomov.eu Git - linux-2.6/blob - 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 /**
  41  * Emit blits for scheduled buffer swaps.
  42  *
  43  * This function will be called with the HW lock held.
  44  */
  45 static void i915_vblank_tasklet(struct drm_device *dev)
  46 {
  47         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  48         unsigned long irqflags;
  49         struct list_head *list, *tmp, hits, *hit;
  50         int nhits, nrects, slice[2], upper[2], lower[2], i;
  51         unsigned counter[2] = { atomic_read(&dev->vbl_received),
  52                                 atomic_read(&dev->vbl_received2) };
  53         struct drm_drawable_info *drw;
  54         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
  55         u32 cpp = dev_priv->cpp;
  56         u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
  57                                 XY_SRC_COPY_BLT_WRITE_ALPHA |
  58                                 XY_SRC_COPY_BLT_WRITE_RGB)
  59                              : XY_SRC_COPY_BLT_CMD;
  60         u32 pitchropcpp = (sarea_priv->pitch * cpp) | (0xcc << 16) |
  61                           (cpp << 23) | (1 << 24);
  62         RING_LOCALS;
  63
  64         DRM_DEBUG("\n");
  65
  66         INIT_LIST_HEAD(&hits);
  67
  68         nhits = nrects = 0;
  69
  70         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
  71
  72         /* Find buffer swaps scheduled for this vertical blank */
  73         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
  74                 drm_i915_vbl_swap_t *vbl_swap =
  75                         list_entry(list, drm_i915_vbl_swap_t, head);
  76
  77                 if ((counter[vbl_swap->pipe] - vbl_swap->sequence) > (1<<23))
  78                         continue;
  79
  80                 list_del(list);
  81                 dev_priv->swaps_pending--;
  82
  83                 spin_unlock(&dev_priv->swaps_lock);
  84                 spin_lock(&dev->drw_lock);
  85
  86                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
  87
  88                 if (!drw) {
  89                         spin_unlock(&dev->drw_lock);
  90                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
  91                         spin_lock(&dev_priv->swaps_lock);
  92                         continue;
  93                 }
  94
  95                 list_for_each(hit, &hits) {
  96                         drm_i915_vbl_swap_t *swap_cmp =
  97                                 list_entry(hit, drm_i915_vbl_swap_t, head);
  98                         struct drm_drawable_info *drw_cmp =
  99                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
 100
 101                         if (drw_cmp &&
 102                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
 103                                 list_add_tail(list, hit);
 104                                 break;
 105                         }
 106                 }
 107
 108                 spin_unlock(&dev->drw_lock);
 109
 110                 /* List of hits was empty, or we reached the end of it */
 111                 if (hit == &hits)
 112                         list_add_tail(list, hits.prev);
 113
 114                 nhits++;
 115
 116                 spin_lock(&dev_priv->swaps_lock);
 117         }
 118
 119         if (nhits == 0) {
 120                 spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 121                 return;
 122         }
 123
 124         spin_unlock(&dev_priv->swaps_lock);
 125
 126         i915_kernel_lost_context(dev);
 127
 128         BEGIN_LP_RING(6);
 129
 130         OUT_RING(GFX_OP_DRAWRECT_INFO);
 131         OUT_RING(0);
 132         OUT_RING(0);
 133         OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 134         OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 135         OUT_RING(0);
 136
 137         ADVANCE_LP_RING();
 138
 139         sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 140
 141         upper[0] = upper[1] = 0;
 142         slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
 143         slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
 144         lower[0] = sarea_priv->pipeA_y + slice[0];
 145         lower[1] = sarea_priv->pipeB_y + slice[0];
 146
 147         spin_lock(&dev->drw_lock);
 148
 149         /* Emit blits for buffer swaps, partitioning both outputs into as many
 150          * slices as there are buffer swaps scheduled in order to avoid tearing
 151          * (based on the assumption that a single buffer swap would always
 152          * complete before scanout starts).
 153          */
 154         for (i = 0; i++ < nhits;
 155              upper[0] = lower[0], lower[0] += slice[0],
 156              upper[1] = lower[1], lower[1] += slice[1]) {
 157                 if (i == nhits)
 158                         lower[0] = lower[1] = sarea_priv->height;
 159
 160                 list_for_each(hit, &hits) {
 161                         drm_i915_vbl_swap_t *swap_hit =
 162                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 163                         struct drm_clip_rect *rect;
 164                         int num_rects, pipe;
 165                         unsigned short top, bottom;
 166
 167                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 168
 169                         if (!drw)
 170                                 continue;
 171
 172                         rect = drw->rects;
 173                         pipe = swap_hit->pipe;
 174                         top = upper[pipe];
 175                         bottom = lower[pipe];
 176
 177                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 178                                 int y1 = max(rect->y1, top);
 179                                 int y2 = min(rect->y2, bottom);
 180
 181                                 if (y1 >= y2)
 182                                         continue;
 183
 184                                 BEGIN_LP_RING(8);
 185
 186                                 OUT_RING(cmd);
 187                                 OUT_RING(pitchropcpp);
 188                                 OUT_RING((y1 << 16) | rect->x1);
 189                                 OUT_RING((y2 << 16) | rect->x2);
 190                                 OUT_RING(sarea_priv->front_offset);
 191                                 OUT_RING((y1 << 16) | rect->x1);
 192                                 OUT_RING(pitchropcpp & 0xffff);
 193                                 OUT_RING(sarea_priv->back_offset);
 194
 195                                 ADVANCE_LP_RING();
 196                         }
 197                 }
 198         }
 199
 200         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 201
 202         list_for_each_safe(hit, tmp, &hits) {
 203                 drm_i915_vbl_swap_t *swap_hit =
 204                         list_entry(hit, drm_i915_vbl_swap_t, head);
 205
 206                 list_del(hit);
 207
 208                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 209         }
 210 }
 211
 212 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 213 {
 214         struct drm_device *dev = (struct drm_device *) arg;
 215         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 216         u16 temp;
 217         u32 pipea_stats, pipeb_stats;
 218
 219         pipea_stats = I915_READ(I915REG_PIPEASTAT);
 220         pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
 221
 222         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 223
 224         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
 225
 226         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
 227
 228         if (temp == 0)
 229                 return IRQ_NONE;
 230
 231         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 232         (void) I915_READ16(I915REG_INT_IDENTITY_R);
 233         DRM_READMEMORYBARRIER();
 234
 235         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 236
 237         if (temp & USER_INT_FLAG)
 238                 DRM_WAKEUP(&dev_priv->irq_queue);
 239
 240         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
 241                 int vblank_pipe = dev_priv->vblank_pipe;
 242
 243                 if ((vblank_pipe &
 244                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
 245                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
 246                         if (temp & VSYNC_PIPEA_FLAG)
 247                                 atomic_inc(&dev->vbl_received);
 248                         if (temp & VSYNC_PIPEB_FLAG)
 249                                 atomic_inc(&dev->vbl_received2);
 250                 } else if (((temp & VSYNC_PIPEA_FLAG) &&
 251                             (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
 252                            ((temp & VSYNC_PIPEB_FLAG) &&
 253                             (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
 254                         atomic_inc(&dev->vbl_received);
 255
 256                 DRM_WAKEUP(&dev->vbl_queue);
 257                 drm_vbl_send_signals(dev);
 258
 259                 if (dev_priv->swaps_pending > 0)
 260                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 261                 I915_WRITE(I915REG_PIPEASTAT,
 262                         pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
 263                         I915_VBLANK_CLEAR);
 264                 I915_WRITE(I915REG_PIPEBSTAT,
 265                         pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
 266                         I915_VBLANK_CLEAR);
 267         }
 268
 269         return IRQ_HANDLED;
 270 }
 271
 272 static int i915_emit_irq(struct drm_device * dev)
 273 {
 274         drm_i915_private_t *dev_priv = dev->dev_private;
 275         RING_LOCALS;
 276
 277         i915_kernel_lost_context(dev);
 278
 279         DRM_DEBUG("%s\n", __FUNCTION__);
 280
 281         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
 282
 283         if (dev_priv->counter > 0x7FFFFFFFUL)
 284                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
 285
 286         BEGIN_LP_RING(6);
 287         OUT_RING(CMD_STORE_DWORD_IDX);
 288         OUT_RING(20);
 289         OUT_RING(dev_priv->counter);
 290         OUT_RING(0);
 291         OUT_RING(0);
 292         OUT_RING(GFX_OP_USER_INTERRUPT);
 293         ADVANCE_LP_RING();
 294
 295         return dev_priv->counter;
 296 }
 297
 298 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 299 {
 300         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 301         int ret = 0;
 302
 303         DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr,
 304                   READ_BREADCRUMB(dev_priv));
 305
 306         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 307                 return 0;
 308
 309         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 310
 311         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 312                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 313
 314         if (ret == -EBUSY) {
 315                 DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
 316                           __FUNCTION__,
 317                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 318         }
 319
 320         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 321         return ret;
 322 }
 323
 324 static int i915_driver_vblank_do_wait(struct drm_device *dev, unsigned int *sequence,
 325                                       atomic_t *counter)
 326 {
 327         drm_i915_private_t *dev_priv = dev->dev_private;
 328         unsigned int cur_vblank;
 329         int ret = 0;
 330
 331         if (!dev_priv) {
 332                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 333                 return -EINVAL;
 334         }
 335
 336         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 337                     (((cur_vblank = atomic_read(counter))
 338                         - *sequence) <= (1<<23)));
 339
 340         *sequence = cur_vblank;
 341
 342         return ret;
 343 }
 344
 345
 346 int i915_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
 347 {
 348         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
 349 }
 350
 351 int i915_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
 352 {
 353         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
 354 }
 355
 356 /* Needs the lock as it touches the ring.
 357  */
 358 int i915_irq_emit(struct drm_device *dev, void *data,
 359                          struct drm_file *file_priv)
 360 {
 361         drm_i915_private_t *dev_priv = dev->dev_private;
 362         drm_i915_irq_emit_t *emit = data;
 363         int result;
 364
 365         LOCK_TEST_WITH_RETURN(dev, file_priv);
 366
 367         if (!dev_priv) {
 368                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 369                 return -EINVAL;
 370         }
 371
 372         result = i915_emit_irq(dev);
 373
 374         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 375                 DRM_ERROR("copy_to_user\n");
 376                 return -EFAULT;
 377         }
 378
 379         return 0;
 380 }
 381
 382 /* Doesn't need the hardware lock.
 383  */
 384 int i915_irq_wait(struct drm_device *dev, void *data,
 385                          struct drm_file *file_priv)
 386 {
 387         drm_i915_private_t *dev_priv = dev->dev_private;
 388         drm_i915_irq_wait_t *irqwait = data;
 389
 390         if (!dev_priv) {
 391                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 392                 return -EINVAL;
 393         }
 394
 395         return i915_wait_irq(dev, irqwait->irq_seq);
 396 }
 397
 398 static void i915_enable_interrupt (struct drm_device *dev)
 399 {
 400         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 401         u16 flag;
 402
 403         flag = 0;
 404         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 405                 flag |= VSYNC_PIPEA_FLAG;
 406         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 407                 flag |= VSYNC_PIPEB_FLAG;
 408
 409         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 410 }
 411
 412 /* Set the vblank monitor pipe
 413  */
 414 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 415                          struct drm_file *file_priv)
 416 {
 417         drm_i915_private_t *dev_priv = dev->dev_private;
 418         drm_i915_vblank_pipe_t *pipe = data;
 419
 420         if (!dev_priv) {
 421                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 422                 return -EINVAL;
 423         }
 424
 425         if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 426                 DRM_ERROR("%s called with invalid pipe 0x%x\n",
 427                           __FUNCTION__, pipe->pipe);
 428                 return -EINVAL;
 429         }
 430
 431         dev_priv->vblank_pipe = pipe->pipe;
 432
 433         i915_enable_interrupt (dev);
 434
 435         return 0;
 436 }
 437
 438 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 439                          struct drm_file *file_priv)
 440 {
 441         drm_i915_private_t *dev_priv = dev->dev_private;
 442         drm_i915_vblank_pipe_t *pipe = data;
 443         u16 flag;
 444
 445         if (!dev_priv) {
 446                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 447                 return -EINVAL;
 448         }
 449
 450         flag = I915_READ(I915REG_INT_ENABLE_R);
 451         pipe->pipe = 0;
 452         if (flag & VSYNC_PIPEA_FLAG)
 453                 pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
 454         if (flag & VSYNC_PIPEB_FLAG)
 455                 pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
 456
 457         return 0;
 458 }
 459
 460 /**
 461  * Schedule buffer swap at given vertical blank.
 462  */
 463 int i915_vblank_swap(struct drm_device *dev, void *data,
 464                      struct drm_file *file_priv)
 465 {
 466         drm_i915_private_t *dev_priv = dev->dev_private;
 467         drm_i915_vblank_swap_t *swap = data;
 468         drm_i915_vbl_swap_t *vbl_swap;
 469         unsigned int pipe, seqtype, curseq;
 470         unsigned long irqflags;
 471         struct list_head *list;
 472
 473         if (!dev_priv) {
 474                 DRM_ERROR("%s called with no initialization\n", __func__);
 475                 return -EINVAL;
 476         }
 477
 478         if (dev_priv->sarea_priv->rotation) {
 479                 DRM_DEBUG("Rotation not supported\n");
 480                 return -EINVAL;
 481         }
 482
 483         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 484                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
 485                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 486                 return -EINVAL;
 487         }
 488
 489         pipe = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 490
 491         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 492
 493         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 494                 DRM_ERROR("Invalid pipe %d\n", pipe);
 495                 return -EINVAL;
 496         }
 497
 498         spin_lock_irqsave(&dev->drw_lock, irqflags);
 499
 500         if (!drm_get_drawable_info(dev, swap->drawable)) {
 501                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 502                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 503                 return -EINVAL;
 504         }
 505
 506         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 507
 508         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
 509
 510         if (seqtype == _DRM_VBLANK_RELATIVE)
 511                 swap->sequence += curseq;
 512
 513         if ((curseq - swap->sequence) <= (1<<23)) {
 514                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 515                         swap->sequence = curseq + 1;
 516                 } else {
 517                         DRM_DEBUG("Missed target sequence\n");
 518                         return -EINVAL;
 519                 }
 520         }
 521
 522         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 523
 524         list_for_each(list, &dev_priv->vbl_swaps.head) {
 525                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 526
 527                 if (vbl_swap->drw_id == swap->drawable &&
 528                     vbl_swap->pipe == pipe &&
 529                     vbl_swap->sequence == swap->sequence) {
 530                         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 531                         DRM_DEBUG("Already scheduled\n");
 532                         return 0;
 533                 }
 534         }
 535
 536         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 537
 538         if (dev_priv->swaps_pending >= 100) {
 539                 DRM_DEBUG("Too many swaps queued\n");
 540                 return -EBUSY;
 541         }
 542
 543         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 544
 545         if (!vbl_swap) {
 546                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 547                 return -ENOMEM;
 548         }
 549
 550         DRM_DEBUG("\n");
 551
 552         vbl_swap->drw_id = swap->drawable;
 553         vbl_swap->pipe = pipe;
 554         vbl_swap->sequence = swap->sequence;
 555
 556         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 557
 558         list_add_tail((struct list_head *)vbl_swap, &dev_priv->vbl_swaps.head);
 559         dev_priv->swaps_pending++;
 560
 561         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 562
 563         return 0;
 564 }
 565
 566 /* drm_dma.h hooks
 567 */
 568 void i915_driver_irq_preinstall(struct drm_device * dev)
 569 {
 570         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 571
 572         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 573         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 574         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 575 }
 576
 577 void i915_driver_irq_postinstall(struct drm_device * dev)
 578 {
 579         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 580
 581         spin_lock_init(&dev_priv->swaps_lock);
 582         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
 583         dev_priv->swaps_pending = 0;
 584
 585         if (!dev_priv->vblank_pipe)
 586                 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
 587         i915_enable_interrupt(dev);
 588         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 589 }
 590
 591 void i915_driver_irq_uninstall(struct drm_device * dev)
 592 {
 593         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 594         u16 temp;
 595
 596         if (!dev_priv)
 597                 return;
 598
 599         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 600         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 601         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 602
 603         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 604         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 605 }