drivers/gpu/drm/i915/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 MAX_NOPID ((u32)~0)
  35
  36 /**
  37  * Emit blits for scheduled buffer swaps.
  38  *
  39  * This function will be called with the HW lock held.
  40  */
  41 static void i915_vblank_tasklet(struct drm_device *dev)
  42 {
  43         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  44         unsigned long irqflags;
  45         struct list_head *list, *tmp, hits, *hit;
  46         int nhits, nrects, slice[2], upper[2], lower[2], i;
  47         unsigned counter[2] = { atomic_read(&dev->vbl_received),
  48                                 atomic_read(&dev->vbl_received2) };
  49         struct drm_drawable_info *drw;
  50         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
  51         u32 cpp = dev_priv->cpp;
  52         u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
  53                                 XY_SRC_COPY_BLT_WRITE_ALPHA |
  54                                 XY_SRC_COPY_BLT_WRITE_RGB)
  55                              : XY_SRC_COPY_BLT_CMD;
  56         u32 src_pitch = sarea_priv->pitch * cpp;
  57         u32 dst_pitch = sarea_priv->pitch * cpp;
  58         u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
  59         RING_LOCALS;
  60
  61         if (IS_I965G(dev) && sarea_priv->front_tiled) {
  62                 cmd |= XY_SRC_COPY_BLT_DST_TILED;
  63                 dst_pitch >>= 2;
  64         }
  65         if (IS_I965G(dev) && sarea_priv->back_tiled) {
  66                 cmd |= XY_SRC_COPY_BLT_SRC_TILED;
  67                 src_pitch >>= 2;
  68         }
  69
  70         DRM_DEBUG("\n");
  71
  72         INIT_LIST_HEAD(&hits);
  73
  74         nhits = nrects = 0;
  75
  76         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
  77
  78         /* Find buffer swaps scheduled for this vertical blank */
  79         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
  80                 drm_i915_vbl_swap_t *vbl_swap =
  81                         list_entry(list, drm_i915_vbl_swap_t, head);
  82
  83                 if ((counter[vbl_swap->pipe] - vbl_swap->sequence) > (1<<23))
  84                         continue;
  85
  86                 list_del(list);
  87                 dev_priv->swaps_pending--;
  88
  89                 spin_unlock(&dev_priv->swaps_lock);
  90                 spin_lock(&dev->drw_lock);
  91
  92                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
  93
  94                 if (!drw) {
  95                         spin_unlock(&dev->drw_lock);
  96                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
  97                         spin_lock(&dev_priv->swaps_lock);
  98                         continue;
  99                 }
 100
 101                 list_for_each(hit, &hits) {
 102                         drm_i915_vbl_swap_t *swap_cmp =
 103                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 104                         struct drm_drawable_info *drw_cmp =
 105                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
 106
 107                         if (drw_cmp &&
 108                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
 109                                 list_add_tail(list, hit);
 110                                 break;
 111                         }
 112                 }
 113
 114                 spin_unlock(&dev->drw_lock);
 115
 116                 /* List of hits was empty, or we reached the end of it */
 117                 if (hit == &hits)
 118                         list_add_tail(list, hits.prev);
 119
 120                 nhits++;
 121
 122                 spin_lock(&dev_priv->swaps_lock);
 123         }
 124
 125         if (nhits == 0) {
 126                 spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 127                 return;
 128         }
 129
 130         spin_unlock(&dev_priv->swaps_lock);
 131
 132         i915_kernel_lost_context(dev);
 133
 134         if (IS_I965G(dev)) {
 135                 BEGIN_LP_RING(4);
 136
 137                 OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
 138                 OUT_RING(0);
 139                 OUT_RING(((sarea_priv->width - 1) & 0xffff) | ((sarea_priv->height - 1) << 16));
 140                 OUT_RING(0);
 141                 ADVANCE_LP_RING();
 142         } else {
 143                 BEGIN_LP_RING(6);
 144
 145                 OUT_RING(GFX_OP_DRAWRECT_INFO);
 146                 OUT_RING(0);
 147                 OUT_RING(0);
 148                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 149                 OUT_RING(sarea_priv->width | sarea_priv->height << 16);
 150                 OUT_RING(0);
 151
 152                 ADVANCE_LP_RING();
 153         }
 154
 155         sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 156
 157         upper[0] = upper[1] = 0;
 158         slice[0] = max(sarea_priv->pipeA_h / nhits, 1);
 159         slice[1] = max(sarea_priv->pipeB_h / nhits, 1);
 160         lower[0] = sarea_priv->pipeA_y + slice[0];
 161         lower[1] = sarea_priv->pipeB_y + slice[0];
 162
 163         spin_lock(&dev->drw_lock);
 164
 165         /* Emit blits for buffer swaps, partitioning both outputs into as many
 166          * slices as there are buffer swaps scheduled in order to avoid tearing
 167          * (based on the assumption that a single buffer swap would always
 168          * complete before scanout starts).
 169          */
 170         for (i = 0; i++ < nhits;
 171              upper[0] = lower[0], lower[0] += slice[0],
 172              upper[1] = lower[1], lower[1] += slice[1]) {
 173                 if (i == nhits)
 174                         lower[0] = lower[1] = sarea_priv->height;
 175
 176                 list_for_each(hit, &hits) {
 177                         drm_i915_vbl_swap_t *swap_hit =
 178                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 179                         struct drm_clip_rect *rect;
 180                         int num_rects, pipe;
 181                         unsigned short top, bottom;
 182
 183                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 184
 185                         if (!drw)
 186                                 continue;
 187
 188                         rect = drw->rects;
 189                         pipe = swap_hit->pipe;
 190                         top = upper[pipe];
 191                         bottom = lower[pipe];
 192
 193                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 194                                 int y1 = max(rect->y1, top);
 195                                 int y2 = min(rect->y2, bottom);
 196
 197                                 if (y1 >= y2)
 198                                         continue;
 199
 200                                 BEGIN_LP_RING(8);
 201
 202                                 OUT_RING(cmd);
 203                                 OUT_RING(ropcpp | dst_pitch);
 204                                 OUT_RING((y1 << 16) | rect->x1);
 205                                 OUT_RING((y2 << 16) | rect->x2);
 206                                 OUT_RING(sarea_priv->front_offset);
 207                                 OUT_RING((y1 << 16) | rect->x1);
 208                                 OUT_RING(src_pitch);
 209                                 OUT_RING(sarea_priv->back_offset);
 210
 211                                 ADVANCE_LP_RING();
 212                         }
 213                 }
 214         }
 215
 216         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 217
 218         list_for_each_safe(hit, tmp, &hits) {
 219                 drm_i915_vbl_swap_t *swap_hit =
 220                         list_entry(hit, drm_i915_vbl_swap_t, head);
 221
 222                 list_del(hit);
 223
 224                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 225         }
 226 }
 227
 228 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 229 {
 230         struct drm_device *dev = (struct drm_device *) arg;
 231         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 232         u16 temp;
 233         u32 pipea_stats, pipeb_stats;
 234
 235         pipea_stats = I915_READ(PIPEASTAT);
 236         pipeb_stats = I915_READ(PIPEBSTAT);
 237
 238         temp = I915_READ16(IIR);
 239
 240         temp &= (I915_USER_INTERRUPT |
 241                  I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
 242                  I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT);
 243
 244         DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
 245
 246         if (temp == 0)
 247                 return IRQ_NONE;
 248
 249         I915_WRITE16(IIR, temp);
 250         (void) I915_READ16(IIR);
 251         DRM_READMEMORYBARRIER();
 252
 253         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 254
 255         if (temp & I915_USER_INTERRUPT)
 256                 DRM_WAKEUP(&dev_priv->irq_queue);
 257
 258         if (temp & (I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
 259                     I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT)) {
 260                 int vblank_pipe = dev_priv->vblank_pipe;
 261
 262                 if ((vblank_pipe &
 263                      (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
 264                     == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
 265                         if (temp & I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT)
 266                                 atomic_inc(&dev->vbl_received);
 267                         if (temp & I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT)
 268                                 atomic_inc(&dev->vbl_received2);
 269                 } else if (((temp & I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT) &&
 270                             (vblank_pipe & DRM_I915_VBLANK_PIPE_A)) ||
 271                            ((temp & I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT) &&
 272                             (vblank_pipe & DRM_I915_VBLANK_PIPE_B)))
 273                         atomic_inc(&dev->vbl_received);
 274
 275                 DRM_WAKEUP(&dev->vbl_queue);
 276                 drm_vbl_send_signals(dev);
 277
 278                 if (dev_priv->swaps_pending > 0)
 279                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 280                 I915_WRITE(PIPEASTAT,
 281                         pipea_stats|I915_VBLANK_INTERRUPT_ENABLE|
 282                         PIPE_VBLANK_INTERRUPT_STATUS);
 283                 I915_WRITE(PIPEBSTAT,
 284                         pipeb_stats|I915_VBLANK_INTERRUPT_ENABLE|
 285                         PIPE_VBLANK_INTERRUPT_STATUS);
 286         }
 287
 288         return IRQ_HANDLED;
 289 }
 290
 291 static int i915_emit_irq(struct drm_device * dev)
 292 {
 293         drm_i915_private_t *dev_priv = dev->dev_private;
 294         RING_LOCALS;
 295
 296         i915_kernel_lost_context(dev);
 297
 298         DRM_DEBUG("\n");
 299
 300         dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
 301
 302         if (dev_priv->counter > 0x7FFFFFFFUL)
 303                 dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
 304
 305         BEGIN_LP_RING(6);
 306         OUT_RING(MI_STORE_DWORD_INDEX);
 307         OUT_RING(5 << MI_STORE_DWORD_INDEX_SHIFT);
 308         OUT_RING(dev_priv->counter);
 309         OUT_RING(0);
 310         OUT_RING(0);
 311         OUT_RING(MI_USER_INTERRUPT);
 312         ADVANCE_LP_RING();
 313
 314         return dev_priv->counter;
 315 }
 316
 317 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 318 {
 319         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 320         int ret = 0;
 321
 322         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 323                   READ_BREADCRUMB(dev_priv));
 324
 325         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 326                 return 0;
 327
 328         dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 329
 330         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 331                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 332
 333         if (ret == -EBUSY) {
 334                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 335                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 336         }
 337
 338         dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 339         return ret;
 340 }
 341
 342 static int i915_driver_vblank_do_wait(struct drm_device *dev, unsigned int *sequence,
 343                                       atomic_t *counter)
 344 {
 345         drm_i915_private_t *dev_priv = dev->dev_private;
 346         unsigned int cur_vblank;
 347         int ret = 0;
 348
 349         if (!dev_priv) {
 350                 DRM_ERROR("called with no initialization\n");
 351                 return -EINVAL;
 352         }
 353
 354         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 355                     (((cur_vblank = atomic_read(counter))
 356                         - *sequence) <= (1<<23)));
 357
 358         *sequence = cur_vblank;
 359
 360         return ret;
 361 }
 362
 363
 364 int i915_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
 365 {
 366         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
 367 }
 368
 369 int i915_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
 370 {
 371         return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
 372 }
 373
 374 /* Needs the lock as it touches the ring.
 375  */
 376 int i915_irq_emit(struct drm_device *dev, void *data,
 377                          struct drm_file *file_priv)
 378 {
 379         drm_i915_private_t *dev_priv = dev->dev_private;
 380         drm_i915_irq_emit_t *emit = data;
 381         int result;
 382
 383         LOCK_TEST_WITH_RETURN(dev, file_priv);
 384
 385         if (!dev_priv) {
 386                 DRM_ERROR("called with no initialization\n");
 387                 return -EINVAL;
 388         }
 389
 390         result = i915_emit_irq(dev);
 391
 392         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 393                 DRM_ERROR("copy_to_user\n");
 394                 return -EFAULT;
 395         }
 396
 397         return 0;
 398 }
 399
 400 /* Doesn't need the hardware lock.
 401  */
 402 int i915_irq_wait(struct drm_device *dev, void *data,
 403                          struct drm_file *file_priv)
 404 {
 405         drm_i915_private_t *dev_priv = dev->dev_private;
 406         drm_i915_irq_wait_t *irqwait = data;
 407
 408         if (!dev_priv) {
 409                 DRM_ERROR("called with no initialization\n");
 410                 return -EINVAL;
 411         }
 412
 413         return i915_wait_irq(dev, irqwait->irq_seq);
 414 }
 415
 416 static void i915_enable_interrupt (struct drm_device *dev)
 417 {
 418         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 419         u16 flag;
 420
 421         flag = 0;
 422         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
 423                 flag |= I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
 424         if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
 425                 flag |= I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
 426
 427         I915_WRITE16(IER, I915_USER_INTERRUPT | flag);
 428 }
 429
 430 /* Set the vblank monitor pipe
 431  */
 432 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 433                          struct drm_file *file_priv)
 434 {
 435         drm_i915_private_t *dev_priv = dev->dev_private;
 436         drm_i915_vblank_pipe_t *pipe = data;
 437
 438         if (!dev_priv) {
 439                 DRM_ERROR("called with no initialization\n");
 440                 return -EINVAL;
 441         }
 442
 443         if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
 444                 DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
 445                 return -EINVAL;
 446         }
 447
 448         dev_priv->vblank_pipe = pipe->pipe;
 449
 450         i915_enable_interrupt (dev);
 451
 452         return 0;
 453 }
 454
 455 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 456                          struct drm_file *file_priv)
 457 {
 458         drm_i915_private_t *dev_priv = dev->dev_private;
 459         drm_i915_vblank_pipe_t *pipe = data;
 460         u16 flag;
 461
 462         if (!dev_priv) {
 463                 DRM_ERROR("called with no initialization\n");
 464                 return -EINVAL;
 465         }
 466
 467         flag = I915_READ(IER);
 468         pipe->pipe = 0;
 469         if (flag & I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT)
 470                 pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
 471         if (flag & I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT)
 472                 pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
 473
 474         return 0;
 475 }
 476
 477 /**
 478  * Schedule buffer swap at given vertical blank.
 479  */
 480 int i915_vblank_swap(struct drm_device *dev, void *data,
 481                      struct drm_file *file_priv)
 482 {
 483         drm_i915_private_t *dev_priv = dev->dev_private;
 484         drm_i915_vblank_swap_t *swap = data;
 485         drm_i915_vbl_swap_t *vbl_swap;
 486         unsigned int pipe, seqtype, curseq;
 487         unsigned long irqflags;
 488         struct list_head *list;
 489
 490         if (!dev_priv) {
 491                 DRM_ERROR("%s called with no initialization\n", __func__);
 492                 return -EINVAL;
 493         }
 494
 495         if (dev_priv->sarea_priv->rotation) {
 496                 DRM_DEBUG("Rotation not supported\n");
 497                 return -EINVAL;
 498         }
 499
 500         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 501                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)) {
 502                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 503                 return -EINVAL;
 504         }
 505
 506         pipe = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 507
 508         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 509
 510         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 511                 DRM_ERROR("Invalid pipe %d\n", pipe);
 512                 return -EINVAL;
 513         }
 514
 515         spin_lock_irqsave(&dev->drw_lock, irqflags);
 516
 517         if (!drm_get_drawable_info(dev, swap->drawable)) {
 518                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 519                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 520                 return -EINVAL;
 521         }
 522
 523         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 524
 525         curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
 526
 527         if (seqtype == _DRM_VBLANK_RELATIVE)
 528                 swap->sequence += curseq;
 529
 530         if ((curseq - swap->sequence) <= (1<<23)) {
 531                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 532                         swap->sequence = curseq + 1;
 533                 } else {
 534                         DRM_DEBUG("Missed target sequence\n");
 535                         return -EINVAL;
 536                 }
 537         }
 538
 539         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 540
 541         list_for_each(list, &dev_priv->vbl_swaps.head) {
 542                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 543
 544                 if (vbl_swap->drw_id == swap->drawable &&
 545                     vbl_swap->pipe == pipe &&
 546                     vbl_swap->sequence == swap->sequence) {
 547                         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 548                         DRM_DEBUG("Already scheduled\n");
 549                         return 0;
 550                 }
 551         }
 552
 553         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 554
 555         if (dev_priv->swaps_pending >= 100) {
 556                 DRM_DEBUG("Too many swaps queued\n");
 557                 return -EBUSY;
 558         }
 559
 560         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 561
 562         if (!vbl_swap) {
 563                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 564                 return -ENOMEM;
 565         }
 566
 567         DRM_DEBUG("\n");
 568
 569         vbl_swap->drw_id = swap->drawable;
 570         vbl_swap->pipe = pipe;
 571         vbl_swap->sequence = swap->sequence;
 572
 573         spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
 574
 575         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
 576         dev_priv->swaps_pending++;
 577
 578         spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
 579
 580         return 0;
 581 }
 582
 583 /* drm_dma.h hooks
 584 */
 585 void i915_driver_irq_preinstall(struct drm_device * dev)
 586 {
 587         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 588
 589         I915_WRITE16(HWSTAM, 0xfffe);
 590         I915_WRITE16(IMR, 0x0);
 591         I915_WRITE16(IER, 0x0);
 592 }
 593
 594 void i915_driver_irq_postinstall(struct drm_device * dev)
 595 {
 596         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 597
 598         spin_lock_init(&dev_priv->swaps_lock);
 599         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
 600         dev_priv->swaps_pending = 0;
 601
 602         if (!dev_priv->vblank_pipe)
 603                 dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A;
 604         i915_enable_interrupt(dev);
 605         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 606 }
 607
 608 void i915_driver_irq_uninstall(struct drm_device * dev)
 609 {
 610         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 611         u16 temp;
 612
 613         if (!dev_priv)
 614                 return;
 615
 616         I915_WRITE16(HWSTAM, 0xffff);
 617         I915_WRITE16(IMR, 0xffff);
 618         I915_WRITE16(IER, 0x0);
 619
 620         temp = I915_READ16(IIR);
 621         I915_WRITE16(IIR, temp);
 622 }