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         if (IS_I965G(dev)) {
 129                 BEGIN_LP_RING(4);
 130
 131                 OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
 132                 OUT_RING(0);
 133                 OUT_RING(((sarea_priv->width - 1) & 0xffff) | ((sarea_priv->height - 1) << 16));
 134                 OUT_RING(0);
 135                 ADVANCE_LP_RING();
 136         } else {
 137                 BEGIN_LP_RING(6);
 138
 139                 OUT_RING(GFX_OP_DRAWRECT_INFO);
 140                 OUT_RING(0);
 141                 OUT_RING(0);
 142                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 143                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 144                 OUT_RING(0);
 145
 146                 ADVANCE_LP_RING();
 147         }
 148
 149         sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 150
 151         upper[0] = upper[1] = 0;
 152         slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
 153         slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
 154         lower[0] = sarea_priv->pipeA_y + slice[0];
 155         lower[1] = sarea_priv->pipeB_y + slice[0];
 156
 157         spin_lock(&dev->drw_lock);
 158
 159         /* Emit blits for buffer swaps, partitioning both outputs into as many
 160          * slices as there are buffer swaps scheduled in order to avoid tearing
 161          * (based on the assumption that a single buffer swap would always
 162          * complete before scanout starts).
 163          */
 164         for (i = 0; i++ < nhits;
 165              upper[0] = lower[0], lower[0] += slice[0],
 166              upper[1] = lower[1], lower[1] += slice[1]) {
 167                 if (i == nhits)
 168                         lower[0] = lower[1] = sarea_priv->height;
 169
 170                 list_for_each(hit, &hits) {
 171                         drm_i915_vbl_swap_t *swap_hit =
 172                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 173                         struct drm_clip_rect *rect;
 174                         int num_rects, pipe;
 175                         unsigned short top, bottom;
 176
 177                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 178
 179                         if (!drw)
 180                                 continue;
 181
 182                         rect = drw->rects;
 183                         pipe = swap_hit->pipe;
 184                         top = upper[pipe];
 185                         bottom = lower[pipe];
 186
 187                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 188                                 int y1 = max(rect->y1, top);
 189                                 int y2 = min(rect->y2, bottom);
 190
 191                                 if (y1 >= y2)
 192                                         continue;
 193
 194                                 BEGIN_LP_RING(8);
 195
 196                                 OUT_RING(cmd);
 197                                 OUT_RING(pitchropcpp);
 198                                 OUT_RING((y1 << 16) | rect->x1);
 199                                 OUT_RING((y2 << 16) | rect->x2);
 200                                 OUT_RING(sarea_priv->front_offset);
 201                                 OUT_RING((y1 << 16) | rect->x1);
 202                                 OUT_RING(pitchropcpp & 0xffff);
 203                                 OUT_RING(sarea_priv->back_offset);
 204
 205                                 ADVANCE_LP_RING();
 206                         }
 207                 }
 208         }
 209
 210         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 211
 212         list_for_each_safe(hit, tmp, &hits) {
 213                 drm_i915_vbl_swap_t *swap_hit =
 214                         list_entry(hit, drm_i915_vbl_swap_t, head);
 215
 216                 list_del(hit);
 217
 218                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 219         }
 220 }
 221
 222 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 223 {
 224         struct drm_device *dev = (struct drm_device *) arg;
 225         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 226         u16 temp;
 227         u32 pipea_stats, pipeb_stats;
 228
 229         pipea_stats = I915_READ(I915REG_PIPEASTAT);
 230         pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
 231
 232         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 233
 234         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
 235
 236         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
 237
 238         if (temp == 0)
 239                 return IRQ_NONE;
 240
 241         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 242         (void) I915_READ16(I915REG_INT_IDENTITY_R);
 243         DRM_READMEMORYBARRIER();
 244
 245         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 246
 247         if (temp & USER_INT_FLAG)
 248                 DRM_WAKEUP(&dev_priv->irq_queue);
 249
 250         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
 251                 int vblank_pipe = dev_priv->vblank_pipe;
 252
 253                 if ((vblank_pipe &
 254                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
 255                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
 256                         if (temp & VSYNC_PIPEA_FLAG)
 257                                 atomic_inc(&dev->vbl_received);
 258                         if (temp & VSYNC_PIPEB_FLAG)
 259                                 atomic_inc(&dev->vbl_received2);
 260                 } else if (((temp & VSYNC_PIPEA_FLAG) &&
 261                             (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
 262                            ((temp & VSYNC_PIPEB_FLAG) &&
 263                             (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
 264                         atomic_inc(&dev->vbl_received);
 265
 266                 DRM_WAKEUP(&dev->vbl_queue);
 267                 drm_vbl_send_signals(dev);
 268
 269                 if (dev_priv->swaps_pending > 0)
 270                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 271                 I915_WRITE(I915REG_PIPEASTAT,
 272                         pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
 273                         I915_VBLANK_CLEAR);
 274                 I915_WRITE(I915REG_PIPEBSTAT,
 275                         pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
 276                         I915_VBLANK_CLEAR);
 277         }
 278
 279         return IRQ_HANDLED;
 280 }
 281
 282 static int i915_emit_irq(struct drm_device * dev)
 283 {
 284         drm_i915_private_t *dev_priv = dev->dev_private;
 285         RING_LOCALS;
 286
 287         i915_kernel_lost_context(dev);
 288
 289         DRM_DEBUG("\n");
 290
 291         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
 292
 293         if (dev_priv->counter > 0x7FFFFFFFUL)
 294                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
 295
 296         BEGIN_LP_RING(6);
 297         OUT_RING(CMD_STORE_DWORD_IDX);
 298         OUT_RING(20);
 299         OUT_RING(dev_priv->counter);
 300         OUT_RING(0);
 301         OUT_RING(0);
 302         OUT_RING(GFX_OP_USER_INTERRUPT);
 303         ADVANCE_LP_RING();
 304
 305         return dev_priv->counter;
 306 }
 307
 308 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 309 {
 310         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 311         int ret = 0;
 312
 313         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 314                   READ_BREADCRUMB(dev_priv));
 315
 316         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 317                 return 0;
 318
 319         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 320
 321         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 322                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 323
 324         if (ret == -EBUSY) {
 325                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 326                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 327         }
 328
 329         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 330         return ret;
 331 }
 332
 333 static int i915_driver_vblank_do_wait(struct drm_device *dev, unsigned int *sequence,
 334                                       atomic_t *counter)
 335 {
 336         drm_i915_private_t *dev_priv = dev->dev_private;
 337         unsigned int cur_vblank;
 338         int ret = 0;
 339
 340         if (!dev_priv) {
 341                 DRM_ERROR("called with no initialization\n");
 342                 return -EINVAL;
 343         }
 344
 345         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 346                     (((cur_vblank = atomic_read(counter))
 347                         - *sequence) <= (1<<23)));
 348
 349         *sequence = cur_vblank;
 350
 351         return ret;
 352 }
 353
 354
 355 int i915_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
 356 {
 357         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
 358 }
 359
 360 int i915_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
 361 {
 362         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
 363 }
 364
 365 /* Needs the lock as it touches the ring.
 366  */
 367 int i915_irq_emit(struct drm_device *dev, void *data,
 368                          struct drm_file *file_priv)
 369 {
 370         drm_i915_private_t *dev_priv = dev->dev_private;
 371         drm_i915_irq_emit_t *emit = data;
 372         int result;
 373
 374         LOCK_TEST_WITH_RETURN(dev, file_priv);
 375
 376         if (!dev_priv) {
 377                 DRM_ERROR("called with no initialization\n");
 378                 return -EINVAL;
 379         }
 380
 381         result = i915_emit_irq(dev);
 382
 383         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 384                 DRM_ERROR("copy_to_user\n");
 385                 return -EFAULT;
 386         }
 387
 388         return 0;
 389 }
 390
 391 /* Doesn't need the hardware lock.
 392  */
 393 int i915_irq_wait(struct drm_device *dev, void *data,
 394                          struct drm_file *file_priv)
 395 {
 396         drm_i915_private_t *dev_priv = dev->dev_private;
 397         drm_i915_irq_wait_t *irqwait = data;
 398
 399         if (!dev_priv) {
 400                 DRM_ERROR("called with no initialization\n");
 401                 return -EINVAL;
 402         }
 403
 404         return i915_wait_irq(dev, irqwait->irq_seq);
 405 }
 406
 407 static void i915_enable_interrupt (struct drm_device *dev)
 408 {
 409         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 410         u16 flag;
 411
 412         flag = 0;
 413         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 414                 flag |= VSYNC_PIPEA_FLAG;
 415         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 416                 flag |= VSYNC_PIPEB_FLAG;
 417
 418         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 419 }
 420
 421 /* Set the vblank monitor pipe
 422  */
 423 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 424                          struct drm_file *file_priv)
 425 {
 426         drm_i915_private_t *dev_priv = dev->dev_private;
 427         drm_i915_vblank_pipe_t *pipe = data;
 428
 429         if (!dev_priv) {
 430                 DRM_ERROR("called with no initialization\n");
 431                 return -EINVAL;
 432         }
 433
 434         if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 435                 DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
 436                 return -EINVAL;
 437         }
 438
 439         dev_priv->vblank_pipe = pipe->pipe;
 440
 441         i915_enable_interrupt (dev);
 442
 443         return 0;
 444 }
 445
 446 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 447                          struct drm_file *file_priv)
 448 {
 449         drm_i915_private_t *dev_priv = dev->dev_private;
 450         drm_i915_vblank_pipe_t *pipe = data;
 451         u16 flag;
 452
 453         if (!dev_priv) {
 454                 DRM_ERROR("called with no initialization\n");
 455                 return -EINVAL;
 456         }
 457
 458         flag = I915_READ(I915REG_INT_ENABLE_R);
 459         pipe->pipe = 0;
 460         if (flag & VSYNC_PIPEA_FLAG)
 461                 pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
 462         if (flag & VSYNC_PIPEB_FLAG)
 463                 pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
 464
 465         return 0;
 466 }
 467
 468 /**
 469  * Schedule buffer swap at given vertical blank.
 470  */
 471 int i915_vblank_swap(struct drm_device *dev, void *data,
 472                      struct drm_file *file_priv)
 473 {
 474         drm_i915_private_t *dev_priv = dev->dev_private;
 475         drm_i915_vblank_swap_t *swap = data;
 476         drm_i915_vbl_swap_t *vbl_swap;
 477         unsigned int pipe, seqtype, curseq;
 478         unsigned long irqflags;
 479         struct list_head *list;
 480
 481         if (!dev_priv) {
 482                 DRM_ERROR("%s called with no initialization\n", __func__);
 483                 return -EINVAL;
 484         }
 485
 486         if (dev_priv->sarea_priv->rotation) {
 487                 DRM_DEBUG("Rotation not supported\n");
 488                 return -EINVAL;
 489         }
 490
 491         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 492                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
 493                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 494                 return -EINVAL;
 495         }
 496
 497         pipe = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 498
 499         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 500
 501         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 502                 DRM_ERROR("Invalid pipe %d\n", pipe);
 503                 return -EINVAL;
 504         }
 505
 506         spin_lock_irqsave(&dev->drw_lock, irqflags);
 507
 508         if (!drm_get_drawable_info(dev, swap->drawable)) {
 509                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 510                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 511                 return -EINVAL;
 512         }
 513
 514         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 515
 516         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
 517
 518         if (seqtype == _DRM_VBLANK_RELATIVE)
 519                 swap->sequence += curseq;
 520
 521         if ((curseq - swap->sequence) <= (1<<23)) {
 522                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 523                         swap->sequence = curseq + 1;
 524                 } else {
 525                         DRM_DEBUG("Missed target sequence\n");
 526                         return -EINVAL;
 527                 }
 528         }
 529
 530         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 531
 532         list_for_each(list, &dev_priv->vbl_swaps.head) {
 533                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 534
 535                 if (vbl_swap->drw_id == swap->drawable &&
 536                     vbl_swap->pipe == pipe &&
 537                     vbl_swap->sequence == swap->sequence) {
 538                         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 539                         DRM_DEBUG("Already scheduled\n");
 540                         return 0;
 541                 }
 542         }
 543
 544         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 545
 546         if (dev_priv->swaps_pending >= 100) {
 547                 DRM_DEBUG("Too many swaps queued\n");
 548                 return -EBUSY;
 549         }
 550
 551         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 552
 553         if (!vbl_swap) {
 554                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 555                 return -ENOMEM;
 556         }
 557
 558         DRM_DEBUG("\n");
 559
 560         vbl_swap->drw_id = swap->drawable;
 561         vbl_swap->pipe = pipe;
 562         vbl_swap->sequence = swap->sequence;
 563
 564         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 565
 566         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
 567         dev_priv->swaps_pending++;
 568
 569         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 570
 571         return 0;
 572 }
 573
 574 /* drm_dma.h hooks
 575 */
 576 void i915_driver_irq_preinstall(struct drm_device * dev)
 577 {
 578         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 579
 580         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 581         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 582         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 583 }
 584
 585 void i915_driver_irq_postinstall(struct drm_device * dev)
 586 {
 587         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 588
 589         spin_lock_init(&dev_priv->swaps_lock);
 590         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
 591         dev_priv->swaps_pending = 0;
 592
 593         if (!dev_priv->vblank_pipe)
 594                 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
 595         i915_enable_interrupt(dev);
 596         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 597 }
 598
 599 void i915_driver_irq_uninstall(struct drm_device * dev)
 600 {
 601         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 602         u16 temp;
 603
 604         if (!dev_priv)
 605                 return;
 606
 607         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 608         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 609         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 610
 611         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 612         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 613 }