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 src_pitch = sarea_priv->pitch * cpp;
  61         u32 dst_pitch = sarea_priv->pitch * cpp;
  62         u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
  63         RING_LOCALS;
  64
  65         if (IS_I965G(dev) && sarea_priv->front_tiled) {
  66                 cmd |= XY_SRC_COPY_BLT_DST_TILED;
  67                 dst_pitch >>= 2;
  68         }
  69         if (IS_I965G(dev) && sarea_priv->back_tiled) {
  70                 cmd |= XY_SRC_COPY_BLT_SRC_TILED;
  71                 src_pitch >>= 2;
  72         }
  73
  74         DRM_DEBUG("\n");
  75
  76         INIT_LIST_HEAD(&hits);
  77
  78         nhits = nrects = 0;
  79
  80         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
  81
  82         /* Find buffer swaps scheduled for this vertical blank */
  83         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
  84                 drm_i915_vbl_swap_t *vbl_swap =
  85                         list_entry(list, drm_i915_vbl_swap_t, head);
  86
  87                 if ((counter[vbl_swap->pipe] - vbl_swap->sequence) > (1<<23))
  88                         continue;
  89
  90                 list_del(list);
  91                 dev_priv->swaps_pending--;
  92
  93                 spin_unlock(&dev_priv->swaps_lock);
  94                 spin_lock(&dev->drw_lock);
  95
  96                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
  97
  98                 if (!drw) {
  99                         spin_unlock(&dev->drw_lock);
 100                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 101                         spin_lock(&dev_priv->swaps_lock);
 102                         continue;
 103                 }
 104
 105                 list_for_each(hit, &hits) {
 106                         drm_i915_vbl_swap_t *swap_cmp =
 107                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 108                         struct drm_drawable_info *drw_cmp =
 109                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
 110
 111                         if (drw_cmp &&
 112                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
 113                                 list_add_tail(list, hit);
 114                                 break;
 115                         }
 116                 }
 117
 118                 spin_unlock(&dev->drw_lock);
 119
 120                 /* List of hits was empty, or we reached the end of it */
 121                 if (hit == &hits)
 122                         list_add_tail(list, hits.prev);
 123
 124                 nhits++;
 125
 126                 spin_lock(&dev_priv->swaps_lock);
 127         }
 128
 129         if (nhits == 0) {
 130                 spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 131                 return;
 132         }
 133
 134         spin_unlock(&dev_priv->swaps_lock);
 135
 136         i915_kernel_lost_context(dev);
 137
 138         if (IS_I965G(dev)) {
 139                 BEGIN_LP_RING(4);
 140
 141                 OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
 142                 OUT_RING(0);
 143                 OUT_RING(((sarea_priv->width - 1) & 0xffff) | ((sarea_priv->height - 1) << 16));
 144                 OUT_RING(0);
 145                 ADVANCE_LP_RING();
 146         } else {
 147                 BEGIN_LP_RING(6);
 148
 149                 OUT_RING(GFX_OP_DRAWRECT_INFO);
 150                 OUT_RING(0);
 151                 OUT_RING(0);
 152                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 153                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 154                 OUT_RING(0);
 155
 156                 ADVANCE_LP_RING();
 157         }
 158
 159         sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 160
 161         upper[0] = upper[1] = 0;
 162         slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
 163         slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
 164         lower[0] = sarea_priv->pipeA_y + slice[0];
 165         lower[1] = sarea_priv->pipeB_y + slice[0];
 166
 167         spin_lock(&dev->drw_lock);
 168
 169         /* Emit blits for buffer swaps, partitioning both outputs into as many
 170          * slices as there are buffer swaps scheduled in order to avoid tearing
 171          * (based on the assumption that a single buffer swap would always
 172          * complete before scanout starts).
 173          */
 174         for (i = 0; i++ < nhits;
 175              upper[0] = lower[0], lower[0] += slice[0],
 176              upper[1] = lower[1], lower[1] += slice[1]) {
 177                 if (i == nhits)
 178                         lower[0] = lower[1] = sarea_priv->height;
 179
 180                 list_for_each(hit, &hits) {
 181                         drm_i915_vbl_swap_t *swap_hit =
 182                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 183                         struct drm_clip_rect *rect;
 184                         int num_rects, pipe;
 185                         unsigned short top, bottom;
 186
 187                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 188
 189                         if (!drw)
 190                                 continue;
 191
 192                         rect = drw->rects;
 193                         pipe = swap_hit->pipe;
 194                         top = upper[pipe];
 195                         bottom = lower[pipe];
 196
 197                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 198                                 int y1 = max(rect->y1, top);
 199                                 int y2 = min(rect->y2, bottom);
 200
 201                                 if (y1 >= y2)
 202                                         continue;
 203
 204                                 BEGIN_LP_RING(8);
 205
 206                                 OUT_RING(cmd);
 207                                 OUT_RING(ropcpp | dst_pitch);
 208                                 OUT_RING((y1 << 16) | rect->x1);
 209                                 OUT_RING((y2 << 16) | rect->x2);
 210                                 OUT_RING(sarea_priv->front_offset);
 211                                 OUT_RING((y1 << 16) | rect->x1);
 212                                 OUT_RING(src_pitch);
 213                                 OUT_RING(sarea_priv->back_offset);
 214
 215                                 ADVANCE_LP_RING();
 216                         }
 217                 }
 218         }
 219
 220         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 221
 222         list_for_each_safe(hit, tmp, &hits) {
 223                 drm_i915_vbl_swap_t *swap_hit =
 224                         list_entry(hit, drm_i915_vbl_swap_t, head);
 225
 226                 list_del(hit);
 227
 228                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 229         }
 230 }
 231
 232 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 233 {
 234         struct drm_device *dev = (struct drm_device *) arg;
 235         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 236         u16 temp;
 237         u32 pipea_stats, pipeb_stats;
 238
 239         pipea_stats = I915_READ(I915REG_PIPEASTAT);
 240         pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
 241
 242         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 243
 244         temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
 245
 246         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
 247
 248         if (temp == 0)
 249                 return IRQ_NONE;
 250
 251         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 252         (void) I915_READ16(I915REG_INT_IDENTITY_R);
 253         DRM_READMEMORYBARRIER();
 254
 255         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 256
 257         if (temp & USER_INT_FLAG)
 258                 DRM_WAKEUP(&dev_priv->irq_queue);
 259
 260         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
 261                 int vblank_pipe = dev_priv->vblank_pipe;
 262
 263                 if ((vblank_pipe &
 264                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
 265                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
 266                         if (temp & VSYNC_PIPEA_FLAG)
 267                                 atomic_inc(&dev->vbl_received);
 268                         if (temp & VSYNC_PIPEB_FLAG)
 269                                 atomic_inc(&dev->vbl_received2);
 270                 } else if (((temp & VSYNC_PIPEA_FLAG) &&
 271                             (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
 272                            ((temp & VSYNC_PIPEB_FLAG) &&
 273                             (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
 274                         atomic_inc(&dev->vbl_received);
 275
 276                 DRM_WAKEUP(&dev->vbl_queue);
 277                 drm_vbl_send_signals(dev);
 278
 279                 if (dev_priv->swaps_pending > 0)
 280                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 281                 I915_WRITE(I915REG_PIPEASTAT,
 282                         pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
 283                         I915_VBLANK_CLEAR);
 284                 I915_WRITE(I915REG_PIPEBSTAT,
 285                         pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
 286                         I915_VBLANK_CLEAR);
 287         }
 288
 289         return IRQ_HANDLED;
 290 }
 291
 292 static int i915_emit_irq(struct drm_device * dev)
 293 {
 294         drm_i915_private_t *dev_priv = dev->dev_private;
 295         RING_LOCALS;
 296
 297         i915_kernel_lost_context(dev);
 298
 299         DRM_DEBUG("\n");
 300
 301         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
 302
 303         if (dev_priv->counter > 0x7FFFFFFFUL)
 304                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
 305
 306         BEGIN_LP_RING(6);
 307         OUT_RING(CMD_STORE_DWORD_IDX);
 308         OUT_RING(20);
 309         OUT_RING(dev_priv->counter);
 310         OUT_RING(0);
 311         OUT_RING(0);
 312         OUT_RING(GFX_OP_USER_INTERRUPT);
 313         ADVANCE_LP_RING();
 314
 315         return dev_priv->counter;
 316 }
 317
 318 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 319 {
 320         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 321         int ret = 0;
 322
 323         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 324                   READ_BREADCRUMB(dev_priv));
 325
 326         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 327                 return 0;
 328
 329         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 330
 331         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 332                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 333
 334         if (ret == -EBUSY) {
 335                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 336                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 337         }
 338
 339         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 340         return ret;
 341 }
 342
 343 static int i915_driver_vblank_do_wait(struct drm_device *dev, unsigned int *sequence,
 344                                       atomic_t *counter)
 345 {
 346         drm_i915_private_t *dev_priv = dev->dev_private;
 347         unsigned int cur_vblank;
 348         int ret = 0;
 349
 350         if (!dev_priv) {
 351                 DRM_ERROR("called with no initialization\n");
 352                 return -EINVAL;
 353         }
 354
 355         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 356                     (((cur_vblank = atomic_read(counter))
 357                         - *sequence) <= (1<<23)));
 358
 359         *sequence = cur_vblank;
 360
 361         return ret;
 362 }
 363
 364
 365 int i915_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
 366 {
 367         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
 368 }
 369
 370 int i915_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
 371 {
 372         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
 373 }
 374
 375 /* Needs the lock as it touches the ring.
 376  */
 377 int i915_irq_emit(struct drm_device *dev, void *data,
 378                          struct drm_file *file_priv)
 379 {
 380         drm_i915_private_t *dev_priv = dev->dev_private;
 381         drm_i915_irq_emit_t *emit = data;
 382         int result;
 383
 384         LOCK_TEST_WITH_RETURN(dev, file_priv);
 385
 386         if (!dev_priv) {
 387                 DRM_ERROR("called with no initialization\n");
 388                 return -EINVAL;
 389         }
 390
 391         result = i915_emit_irq(dev);
 392
 393         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 394                 DRM_ERROR("copy_to_user\n");
 395                 return -EFAULT;
 396         }
 397
 398         return 0;
 399 }
 400
 401 /* Doesn't need the hardware lock.
 402  */
 403 int i915_irq_wait(struct drm_device *dev, void *data,
 404                          struct drm_file *file_priv)
 405 {
 406         drm_i915_private_t *dev_priv = dev->dev_private;
 407         drm_i915_irq_wait_t *irqwait = data;
 408
 409         if (!dev_priv) {
 410                 DRM_ERROR("called with no initialization\n");
 411                 return -EINVAL;
 412         }
 413
 414         return i915_wait_irq(dev, irqwait->irq_seq);
 415 }
 416
 417 static void i915_enable_interrupt (struct drm_device *dev)
 418 {
 419         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 420         u16 flag;
 421
 422         flag = 0;
 423         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 424                 flag |= VSYNC_PIPEA_FLAG;
 425         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 426                 flag |= VSYNC_PIPEB_FLAG;
 427
 428         I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
 429 }
 430
 431 /* Set the vblank monitor pipe
 432  */
 433 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 434                          struct drm_file *file_priv)
 435 {
 436         drm_i915_private_t *dev_priv = dev->dev_private;
 437         drm_i915_vblank_pipe_t *pipe = data;
 438
 439         if (!dev_priv) {
 440                 DRM_ERROR("called with no initialization\n");
 441                 return -EINVAL;
 442         }
 443
 444         if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 445                 DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
 446                 return -EINVAL;
 447         }
 448
 449         dev_priv->vblank_pipe = pipe->pipe;
 450
 451         i915_enable_interrupt (dev);
 452
 453         return 0;
 454 }
 455
 456 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 457                          struct drm_file *file_priv)
 458 {
 459         drm_i915_private_t *dev_priv = dev->dev_private;
 460         drm_i915_vblank_pipe_t *pipe = data;
 461         u16 flag;
 462
 463         if (!dev_priv) {
 464                 DRM_ERROR("called with no initialization\n");
 465                 return -EINVAL;
 466         }
 467
 468         flag = I915_READ(I915REG_INT_ENABLE_R);
 469         pipe->pipe = 0;
 470         if (flag & VSYNC_PIPEA_FLAG)
 471                 pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
 472         if (flag & VSYNC_PIPEB_FLAG)
 473                 pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
 474
 475         return 0;
 476 }
 477
 478 /**
 479  * Schedule buffer swap at given vertical blank.
 480  */
 481 int i915_vblank_swap(struct drm_device *dev, void *data,
 482                      struct drm_file *file_priv)
 483 {
 484         drm_i915_private_t *dev_priv = dev->dev_private;
 485         drm_i915_vblank_swap_t *swap = data;
 486         drm_i915_vbl_swap_t *vbl_swap;
 487         unsigned int pipe, seqtype, curseq;
 488         unsigned long irqflags;
 489         struct list_head *list;
 490
 491         if (!dev_priv) {
 492                 DRM_ERROR("%s called with no initialization\n", __func__);
 493                 return -EINVAL;
 494         }
 495
 496         if (dev_priv->sarea_priv->rotation) {
 497                 DRM_DEBUG("Rotation not supported\n");
 498                 return -EINVAL;
 499         }
 500
 501         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 502                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
 503                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 504                 return -EINVAL;
 505         }
 506
 507         pipe = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 508
 509         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 510
 511         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 512                 DRM_ERROR("Invalid pipe %d\n", pipe);
 513                 return -EINVAL;
 514         }
 515
 516         spin_lock_irqsave(&dev->drw_lock, irqflags);
 517
 518         if (!drm_get_drawable_info(dev, swap->drawable)) {
 519                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 520                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 521                 return -EINVAL;
 522         }
 523
 524         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 525
 526         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
 527
 528         if (seqtype == _DRM_VBLANK_RELATIVE)
 529                 swap->sequence += curseq;
 530
 531         if ((curseq - swap->sequence) <= (1<<23)) {
 532                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 533                         swap->sequence = curseq + 1;
 534                 } else {
 535                         DRM_DEBUG("Missed target sequence\n");
 536                         return -EINVAL;
 537                 }
 538         }
 539
 540         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 541
 542         list_for_each(list, &dev_priv->vbl_swaps.head) {
 543                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 544
 545                 if (vbl_swap->drw_id == swap->drawable &&
 546                     vbl_swap->pipe == pipe &&
 547                     vbl_swap->sequence == swap->sequence) {
 548                         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 549                         DRM_DEBUG("Already scheduled\n");
 550                         return 0;
 551                 }
 552         }
 553
 554         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 555
 556         if (dev_priv->swaps_pending >= 100) {
 557                 DRM_DEBUG("Too many swaps queued\n");
 558                 return -EBUSY;
 559         }
 560
 561         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 562
 563         if (!vbl_swap) {
 564                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 565                 return -ENOMEM;
 566         }
 567
 568         DRM_DEBUG("\n");
 569
 570         vbl_swap->drw_id = swap->drawable;
 571         vbl_swap->pipe = pipe;
 572         vbl_swap->sequence = swap->sequence;
 573
 574         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 575
 576         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
 577         dev_priv->swaps_pending++;
 578
 579         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 580
 581         return 0;
 582 }
 583
 584 /* drm_dma.h hooks
 585 */
 586 void i915_driver_irq_preinstall(struct drm_device * dev)
 587 {
 588         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 589
 590         I915_WRITE16(I915REG_HWSTAM, 0xfffe);
 591         I915_WRITE16(I915REG_INT_MASK_R, 0x0);
 592         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 593 }
 594
 595 void i915_driver_irq_postinstall(struct drm_device * dev)
 596 {
 597         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 598
 599         spin_lock_init(&dev_priv->swaps_lock);
 600         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
 601         dev_priv->swaps_pending = 0;
 602
 603         if (!dev_priv->vblank_pipe)
 604                 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
 605         i915_enable_interrupt(dev);
 606         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 607 }
 608
 609 void i915_driver_irq_uninstall(struct drm_device * dev)
 610 {
 611         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 612         u16 temp;
 613
 614         if (!dev_priv)
 615                 return;
 616
 617         I915_WRITE16(I915REG_HWSTAM, 0xffff);
 618         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
 619         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
 620
 621         temp = I915_READ16(I915REG_INT_IDENTITY_R);
 622         I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 623 }