shared-core/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  * i915_get_pipe - return the the pipe associated with a given plane
  38  * @dev: DRM device
  39  * @plane: plane to look for
  40  *
  41  * The Intel Mesa & 2D drivers call the vblank routines with a plane number
  42  * rather than a pipe number, since they may not always be equal.  This routine
  43  * maps the given @plane back to a pipe number.
  44  */
  45 static int
  46 i915_get_pipe(struct drm_device *dev, int plane)
  47 {
  48         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  49         u32 dspcntr;
  50
  51         dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);
  52
  53         return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
  54 }
  55
  56 /**
  57  * i915_get_plane - return the the plane associated with a given pipe
  58  * @dev: DRM device
  59  * @pipe: pipe to look for
  60  *
  61  * The Intel Mesa & 2D drivers call the vblank routines with a plane number
  62  * rather than a plane number, since they may not always be equal.  This routine
  63  * maps the given @pipe back to a plane number.
  64  */
  65 static int
  66 i915_get_plane(struct drm_device *dev, int pipe)
  67 {
  68         if (i915_get_pipe(dev, 0) == pipe)
  69                 return 0;
  70         return 1;
  71 }
  72
  73 /**
  74  * i915_pipe_enabled - check if a pipe is enabled
  75  * @dev: DRM device
  76  * @pipe: pipe to check
  77  *
  78  * Reading certain registers when the pipe is disabled can hang the chip.
  79  * Use this routine to make sure the PLL is running and the pipe is active
  80  * before reading such registers if unsure.
  81  */
  82 static int
  83 i915_pipe_enabled(struct drm_device *dev, int pipe)
  84 {
  85         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  86         unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
  87
  88         if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
  89                 return 1;
  90
  91         return 0;
  92 }
  93
  94 /**
  95  * Emit a synchronous flip.
  96  *
  97  * This function must be called with the drawable spinlock held.
  98  */
  99 static void
 100 i915_dispatch_vsync_flip(struct drm_device *dev, struct drm_drawable_info *drw,
 101                          int plane)
 102 {
 103         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 104         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
 105         u16 x1, y1, x2, y2;
 106         int pf_planes = 1 << plane;
 107
 108         DRM_SPINLOCK_ASSERT(&dev->drw_lock);
 109
 110         /* If the window is visible on the other plane, we have to flip on that
 111          * plane as well.
 112          */
 113         if (plane == 1) {
 114                 x1 = sarea_priv->planeA_x;
 115                 y1 = sarea_priv->planeA_y;
 116                 x2 = x1 + sarea_priv->planeA_w;
 117                 y2 = y1 + sarea_priv->planeA_h;
 118         } else {
 119                 x1 = sarea_priv->planeB_x;
 120                 y1 = sarea_priv->planeB_y;
 121                 x2 = x1 + sarea_priv->planeB_w;
 122                 y2 = y1 + sarea_priv->planeB_h;
 123         }
 124
 125         if (x2 > 0 && y2 > 0) {
 126                 int i, num_rects = drw->num_rects;
 127                 struct drm_clip_rect *rect = drw->rects;
 128
 129                 for (i = 0; i < num_rects; i++)
 130                         if (!(rect[i].x1 >= x2 || rect[i].y1 >= y2 ||
 131                               rect[i].x2 <= x1 || rect[i].y2 <= y1)) {
 132                                 pf_planes = 0x3;
 133
 134                                 break;
 135                         }
 136         }
 137
 138         i915_dispatch_flip(dev, pf_planes, 1);
 139 }
 140
 141 /**
 142  * Emit blits for scheduled buffer swaps.
 143  *
 144  * This function will be called with the HW lock held.
 145  */
 146 static void i915_vblank_tasklet(struct drm_device *dev)
 147 {
 148         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 149         struct list_head *list, *tmp, hits, *hit;
 150         int nhits, nrects, slice[2], upper[2], lower[2], i, num_pages;
 151         unsigned counter[2];
 152         struct drm_drawable_info *drw;
 153         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
 154         u32 cpp = dev_priv->cpp,  offsets[3];
 155         u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
 156                                 XY_SRC_COPY_BLT_WRITE_ALPHA |
 157                                 XY_SRC_COPY_BLT_WRITE_RGB)
 158                              : XY_SRC_COPY_BLT_CMD;
 159         u32 src_pitch = sarea_priv->pitch * cpp;
 160         u32 dst_pitch = sarea_priv->pitch * cpp;
 161         /* COPY rop (0xcc), map cpp to magic color depth constants */
 162         u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
 163         RING_LOCALS;
 164
 165         if (IS_I965G(dev) && sarea_priv->front_tiled) {
 166                 cmd |= XY_SRC_COPY_BLT_DST_TILED;
 167                 dst_pitch >>= 2;
 168         }
 169         if (IS_I965G(dev) && sarea_priv->back_tiled) {
 170                 cmd |= XY_SRC_COPY_BLT_SRC_TILED;
 171                 src_pitch >>= 2;
 172         }
 173
 174         counter[0] = drm_vblank_count(dev, 0);
 175         counter[1] = drm_vblank_count(dev, 1);
 176
 177         DRM_DEBUG("\n");
 178
 179         INIT_LIST_HEAD(&hits);
 180
 181         nhits = nrects = 0;
 182
 183         /* No irqsave/restore necessary.  This tasklet may be run in an
 184          * interrupt context or normal context, but we don't have to worry
 185          * about getting interrupted by something acquiring the lock, because
 186          * we are the interrupt context thing that acquires the lock.
 187          */
 188         DRM_SPINLOCK(&dev_priv->swaps_lock);
 189
 190         /* Find buffer swaps scheduled for this vertical blank */
 191         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
 192                 drm_i915_vbl_swap_t *vbl_swap =
 193                         list_entry(list, drm_i915_vbl_swap_t, head);
 194                 int pipe = i915_get_pipe(dev, vbl_swap->plane);
 195
 196                 if ((counter[pipe] - vbl_swap->sequence) > (1<<23))
 197                         continue;
 198
 199                 list_del(list);
 200                 dev_priv->swaps_pending--;
 201                 drm_vblank_put(dev, pipe);
 202
 203                 DRM_SPINUNLOCK(&dev_priv->swaps_lock);
 204                 DRM_SPINLOCK(&dev->drw_lock);
 205
 206                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
 207
 208                 if (!drw) {
 209                         DRM_SPINUNLOCK(&dev->drw_lock);
 210                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 211                         DRM_SPINLOCK(&dev_priv->swaps_lock);
 212                         continue;
 213                 }
 214
 215                 list_for_each(hit, &hits) {
 216                         drm_i915_vbl_swap_t *swap_cmp =
 217                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 218                         struct drm_drawable_info *drw_cmp =
 219                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
 220
 221                         if (drw_cmp &&
 222                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
 223                                 list_add_tail(list, hit);
 224                                 break;
 225                         }
 226                 }
 227
 228                 DRM_SPINUNLOCK(&dev->drw_lock);
 229
 230                 /* List of hits was empty, or we reached the end of it */
 231                 if (hit == &hits)
 232                         list_add_tail(list, hits.prev);
 233
 234                 nhits++;
 235
 236                 DRM_SPINLOCK(&dev_priv->swaps_lock);
 237         }
 238
 239         DRM_SPINUNLOCK(&dev_priv->swaps_lock);
 240
 241         if (nhits == 0) {
 242                 return;
 243         }
 244
 245         i915_kernel_lost_context(dev);
 246
 247         upper[0] = upper[1] = 0;
 248         slice[0] = max(sarea_priv->planeA_h / nhits, 1);
 249         slice[1] = max(sarea_priv->planeB_h / nhits, 1);
 250         lower[0] = sarea_priv->planeA_y + slice[0];
 251         lower[1] = sarea_priv->planeB_y + slice[0];
 252
 253         offsets[0] = sarea_priv->front_offset;
 254         offsets[1] = sarea_priv->back_offset;
 255         offsets[2] = sarea_priv->third_offset;
 256         num_pages = sarea_priv->third_handle ? 3 : 2;
 257
 258         DRM_SPINLOCK(&dev->drw_lock);
 259
 260         /* Emit blits for buffer swaps, partitioning both outputs into as many
 261          * slices as there are buffer swaps scheduled in order to avoid tearing
 262          * (based on the assumption that a single buffer swap would always
 263          * complete before scanout starts).
 264          */
 265         for (i = 0; i++ < nhits;
 266              upper[0] = lower[0], lower[0] += slice[0],
 267              upper[1] = lower[1], lower[1] += slice[1]) {
 268                 int init_drawrect = 1;
 269
 270                 if (i == nhits)
 271                         lower[0] = lower[1] = sarea_priv->height;
 272
 273                 list_for_each(hit, &hits) {
 274                         drm_i915_vbl_swap_t *swap_hit =
 275                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 276                         struct drm_clip_rect *rect;
 277                         int num_rects, plane, front, back;
 278                         unsigned short top, bottom;
 279
 280                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 281
 282                         if (!drw)
 283                                 continue;
 284
 285                         plane = swap_hit->plane;
 286
 287                         if (swap_hit->flip) {
 288                                 i915_dispatch_vsync_flip(dev, drw, plane);
 289                                 continue;
 290                         }
 291
 292                         if (init_drawrect) {
 293                                 int width  = sarea_priv->width;
 294                                 int height = sarea_priv->height;
 295                                 if (IS_I965G(dev)) {
 296                                         BEGIN_LP_RING(4);
 297
 298                                         OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
 299                                         OUT_RING(0);
 300                                         OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
 301                                         OUT_RING(0);
 302
 303                                         ADVANCE_LP_RING();
 304                                 } else {
 305                                         BEGIN_LP_RING(6);
 306
 307                                         OUT_RING(GFX_OP_DRAWRECT_INFO);
 308                                         OUT_RING(0);
 309                                         OUT_RING(0);
 310                                         OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
 311                                         OUT_RING(0);
 312                                         OUT_RING(0);
 313
 314                                         ADVANCE_LP_RING();
 315                                 }
 316
 317                                 sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 318
 319                                 init_drawrect = 0;
 320                         }
 321
 322                         rect = drw->rects;
 323                         top = upper[plane];
 324                         bottom = lower[plane];
 325
 326                         front = (dev_priv->sarea_priv->pf_current_page >>
 327                                  (2 * plane)) & 0x3;
 328                         back = (front + 1) % num_pages;
 329
 330                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 331                                 int y1 = max(rect->y1, top);
 332                                 int y2 = min(rect->y2, bottom);
 333
 334                                 if (y1 >= y2)
 335                                         continue;
 336
 337                                 BEGIN_LP_RING(8);
 338
 339                                 OUT_RING(cmd);
 340                                 OUT_RING(ropcpp | dst_pitch);
 341                                 OUT_RING((y1 << 16) | rect->x1);
 342                                 OUT_RING((y2 << 16) | rect->x2);
 343                                 OUT_RING(offsets[front]);
 344                                 OUT_RING((y1 << 16) | rect->x1);
 345                                 OUT_RING(src_pitch);
 346                                 OUT_RING(offsets[back]);
 347
 348                                 ADVANCE_LP_RING();
 349                         }
 350                 }
 351         }
 352
 353         DRM_SPINUNLOCK(&dev->drw_lock);
 354
 355         list_for_each_safe(hit, tmp, &hits) {
 356                 drm_i915_vbl_swap_t *swap_hit =
 357                         list_entry(hit, drm_i915_vbl_swap_t, head);
 358
 359                 list_del(hit);
 360
 361                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 362         }
 363 }
 364
 365 u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
 366 {
 367         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 368         unsigned long high_frame;
 369         unsigned long low_frame;
 370         u32 high1, high2, low, count;
 371         int pipe;
 372
 373         pipe = i915_get_pipe(dev, plane);
 374         high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
 375         low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
 376
 377         if (!i915_pipe_enabled(dev, pipe)) {
 378             DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
 379             return 0;
 380         }
 381
 382         /*
 383          * High & low register fields aren't synchronized, so make sure
 384          * we get a low value that's stable across two reads of the high
 385          * register.
 386          */
 387         do {
 388                 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 389                          PIPE_FRAME_HIGH_SHIFT);
 390                 low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 391                         PIPE_FRAME_LOW_SHIFT);
 392                 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 393                          PIPE_FRAME_HIGH_SHIFT);
 394         } while (high1 != high2);
 395
 396         count = (high1 << 8) | low;
 397
 398         return count;
 399 }
 400
 401 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 402 {
 403         struct drm_device *dev = (struct drm_device *) arg;
 404         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 405         u32 iir;
 406         u32 pipea_stats, pipeb_stats;
 407         int vblank = 0;
 408
 409         iir = I915_READ(IIR);
 410         if (iir == 0)
 411                 return IRQ_NONE;
 412
 413         /*
 414          * Clear the PIPE(A|B)STAT regs before the IIR otherwise
 415          * we may get extra interrupts.
 416          */
 417         if (iir & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT) {
 418                 pipea_stats = I915_READ(PIPEASTAT);
 419                 if (pipea_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
 420                                    PIPE_VBLANK_INTERRUPT_STATUS))
 421                 {
 422                         vblank++;
 423                         drm_handle_vblank(dev, i915_get_plane(dev, 0));
 424                 }
 425
 426                 I915_WRITE(PIPEASTAT, pipea_stats);
 427         }
 428         if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
 429                 pipeb_stats = I915_READ(PIPEBSTAT);
 430                 /* Ack the event */
 431                 I915_WRITE(PIPEBSTAT, pipeb_stats);
 432
 433                 /* The vblank interrupt gets enabled even if we didn't ask for
 434                    it, so make sure it's shut down again */
 435                 if (!(dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B))
 436                         pipeb_stats &= ~(I915_VBLANK_INTERRUPT_ENABLE);
 437
 438                 if (pipeb_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
 439                                    PIPE_VBLANK_INTERRUPT_STATUS))
 440                 {
 441                         vblank++;
 442                         drm_handle_vblank(dev, i915_get_plane(dev, 1));
 443                 }
 444
 445 #ifdef __linux__
 446 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 447                 if (pipeb_stats & I915_LEGACY_BLC_EVENT_ENABLE)
 448                         opregion_asle_intr(dev);
 449 #endif
 450 #endif
 451                 I915_WRITE(PIPEBSTAT, pipeb_stats);
 452         }
 453
 454 #ifdef __linux__
 455 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 456         if (iir & I915_ASLE_INTERRUPT)
 457                 opregion_asle_intr(dev);
 458 #endif
 459 #endif
 460
 461         if (dev_priv->sarea_priv)
 462             dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 463
 464         I915_WRITE(IIR, iir);
 465         (void) I915_READ(IIR);
 466
 467         if (iir & I915_USER_INTERRUPT) {
 468                 DRM_WAKEUP(&dev_priv->irq_queue);
 469 #ifdef I915_HAVE_FENCE
 470                 i915_fence_handler(dev);
 471 #endif
 472         }
 473
 474         if (vblank) {
 475                 if (dev_priv->swaps_pending > 0)
 476                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 477         }
 478
 479         return IRQ_HANDLED;
 480 }
 481
 482 int i915_emit_irq(struct drm_device *dev)
 483 {
 484         drm_i915_private_t *dev_priv = dev->dev_private;
 485         RING_LOCALS;
 486
 487         i915_kernel_lost_context(dev);
 488
 489         DRM_DEBUG("\n");
 490
 491         i915_emit_breadcrumb(dev);
 492
 493         BEGIN_LP_RING(2);
 494         OUT_RING(0);
 495         OUT_RING(MI_USER_INTERRUPT);
 496         ADVANCE_LP_RING();
 497
 498         return dev_priv->counter;
 499 }
 500
 501 void i915_user_irq_on(drm_i915_private_t *dev_priv)
 502 {
 503         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 504         if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount == 1)){
 505                 dev_priv->irq_enable_reg |= I915_USER_INTERRUPT;
 506                 I915_WRITE(IER, dev_priv->irq_enable_reg);
 507         }
 508         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 509
 510 }
 511
 512 void i915_user_irq_off(drm_i915_private_t *dev_priv)
 513 {
 514         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 515         if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
 516                 //              dev_priv->irq_enable_reg &= ~I915_USER_INTERRUPT;
 517                 //              I915_WRITE(IER, dev_priv->irq_enable_reg);
 518         }
 519         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 520 }
 521
 522
 523 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 524 {
 525         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 526         int ret = 0;
 527
 528         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 529                   READ_BREADCRUMB(dev_priv));
 530
 531         if (READ_BREADCRUMB(dev_priv) >= irq_nr)
 532                 return 0;
 533
 534         i915_user_irq_on(dev_priv);
 535         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 536                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 537         i915_user_irq_off(dev_priv);
 538
 539         if (ret == -EBUSY) {
 540                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 541                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 542         }
 543
 544         if (dev_priv->sarea_priv)
 545                 dev_priv->sarea_priv->last_dispatch =
 546                         READ_BREADCRUMB(dev_priv);
 547         return ret;
 548 }
 549
 550 /* Needs the lock as it touches the ring.
 551  */
 552 int i915_irq_emit(struct drm_device *dev, void *data,
 553                          struct drm_file *file_priv)
 554 {
 555         drm_i915_private_t *dev_priv = dev->dev_private;
 556         drm_i915_irq_emit_t *emit = data;
 557         int result;
 558
 559         LOCK_TEST_WITH_RETURN(dev, file_priv);
 560
 561         if (!dev_priv) {
 562                 DRM_ERROR("called with no initialization\n");
 563                 return -EINVAL;
 564         }
 565
 566         result = i915_emit_irq(dev);
 567
 568         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 569                 DRM_ERROR("copy_to_user\n");
 570                 return -EFAULT;
 571         }
 572
 573         return 0;
 574 }
 575
 576 /* Doesn't need the hardware lock.
 577  */
 578 int i915_irq_wait(struct drm_device *dev, void *data,
 579                   struct drm_file *file_priv)
 580 {
 581         drm_i915_private_t *dev_priv = dev->dev_private;
 582         drm_i915_irq_wait_t *irqwait = data;
 583
 584         if (!dev_priv) {
 585                 DRM_ERROR("called with no initialization\n");
 586                 return -EINVAL;
 587         }
 588
 589         return i915_wait_irq(dev, irqwait->irq_seq);
 590 }
 591
 592 int i915_enable_vblank(struct drm_device *dev, int plane)
 593 {
 594         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 595         int pipe = i915_get_pipe(dev, plane);
 596         u32     pipestat_reg = 0;
 597         u32     pipestat;
 598
 599         switch (pipe) {
 600         case 0:
 601                 pipestat_reg = PIPEASTAT;
 602                 dev_priv->irq_enable_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
 603                 break;
 604         case 1:
 605                 pipestat_reg = PIPEBSTAT;
 606                 dev_priv->irq_enable_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 607                 break;
 608         default:
 609                 DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
 610                           pipe);
 611                 break;
 612         }
 613
 614         if (pipestat_reg)
 615         {
 616                 pipestat = I915_READ (pipestat_reg);
 617                 /*
 618                  * Older chips didn't have the start vblank interrupt,
 619                  * but
 620                  */
 621                 if (IS_I965G (dev))
 622                         pipestat |= PIPE_START_VBLANK_INTERRUPT_ENABLE;
 623                 else
 624                         pipestat |= PIPE_VBLANK_INTERRUPT_ENABLE;
 625                 /*
 626                  * Clear any pending status
 627                  */
 628                 pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
 629                              PIPE_VBLANK_INTERRUPT_STATUS);
 630                 I915_WRITE(pipestat_reg, pipestat);
 631         }
 632         I915_WRITE(IER, dev_priv->irq_enable_reg);
 633
 634         return 0;
 635 }
 636
 637 void i915_disable_vblank(struct drm_device *dev, int plane)
 638 {
 639         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 640         int pipe = i915_get_pipe(dev, plane);
 641         u32     pipestat_reg = 0;
 642         u32     pipestat;
 643
 644         switch (pipe) {
 645         case 0:
 646                 pipestat_reg = PIPEASTAT;
 647                 dev_priv->irq_enable_reg &= ~I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
 648                 break;
 649         case 1:
 650                 pipestat_reg = PIPEBSTAT;
 651                 dev_priv->irq_enable_reg &= ~I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 652                 break;
 653         default:
 654                 DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
 655                           pipe);
 656                 break;
 657         }
 658
 659         I915_WRITE(IER, dev_priv->irq_enable_reg);
 660
 661         if (pipestat_reg)
 662         {
 663                 pipestat = I915_READ (pipestat_reg);
 664                 pipestat &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
 665                               PIPE_VBLANK_INTERRUPT_ENABLE);
 666                 /*
 667                  * Clear any pending status
 668                  */
 669                 pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
 670                              PIPE_VBLANK_INTERRUPT_STATUS);
 671                 I915_WRITE(pipestat_reg, pipestat);
 672         }
 673 }
 674
 675 void i915_enable_interrupt (struct drm_device *dev)
 676 {
 677         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 678
 679         dev_priv->irq_enable_reg |= I915_USER_INTERRUPT;
 680
 681 #ifdef __linux__
 682 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 683         opregion_enable_asle(dev);
 684 #endif
 685 #endif
 686
 687         I915_WRITE(IER, dev_priv->irq_enable_reg);
 688         dev_priv->irq_enabled = 1;
 689 }
 690
 691 /* Set the vblank monitor pipe
 692  */
 693 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 694                          struct drm_file *file_priv)
 695 {
 696         drm_i915_private_t *dev_priv = dev->dev_private;
 697
 698         if (!dev_priv) {
 699                 DRM_ERROR("called with no initialization\n");
 700                 return -EINVAL;
 701         }
 702
 703         return 0;
 704 }
 705
 706 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 707                          struct drm_file *file_priv)
 708 {
 709         drm_i915_private_t *dev_priv = dev->dev_private;
 710         drm_i915_vblank_pipe_t *pipe = data;
 711
 712         if (!dev_priv) {
 713                 DRM_ERROR("called with no initialization\n");
 714                 return -EINVAL;
 715         }
 716
 717         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 718
 719         return 0;
 720 }
 721
 722 /**
 723  * Schedule buffer swap at given vertical blank.
 724  */
 725 int i915_vblank_swap(struct drm_device *dev, void *data,
 726                      struct drm_file *file_priv)
 727 {
 728         drm_i915_private_t *dev_priv = dev->dev_private;
 729         drm_i915_vblank_swap_t *swap = data;
 730         drm_i915_vbl_swap_t *vbl_swap;
 731         unsigned int pipe, seqtype, curseq, plane;
 732         unsigned long irqflags;
 733         struct list_head *list;
 734         int ret;
 735
 736         if (!dev_priv) {
 737                 DRM_ERROR("%s called with no initialization\n", __func__);
 738                 return -EINVAL;
 739         }
 740
 741         if (!dev_priv->sarea_priv || dev_priv->sarea_priv->rotation) {
 742                 DRM_DEBUG("Rotation not supported\n");
 743                 return -EINVAL;
 744         }
 745
 746         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 747                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS |
 748                              _DRM_VBLANK_FLIP)) {
 749                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 750                 return -EINVAL;
 751         }
 752
 753         plane = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 754         pipe = i915_get_pipe(dev, plane);
 755
 756         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 757
 758         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 759                 DRM_ERROR("Invalid pipe %d\n", pipe);
 760                 return -EINVAL;
 761         }
 762
 763         DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
 764
 765         /* It makes no sense to schedule a swap for a drawable that doesn't have
 766          * valid information at this point. E.g. this could mean that the X
 767          * server is too old to push drawable information to the DRM, in which
 768          * case all such swaps would become ineffective.
 769          */
 770         if (!drm_get_drawable_info(dev, swap->drawable)) {
 771                 DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 772                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 773                 return -EINVAL;
 774         }
 775
 776         DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 777
 778         /*
 779          * We take the ref here and put it when the swap actually completes
 780          * in the tasklet.
 781          */
 782         ret = drm_vblank_get(dev, pipe);
 783         if (ret)
 784                 return ret;
 785         curseq = drm_vblank_count(dev, pipe);
 786
 787         if (seqtype == _DRM_VBLANK_RELATIVE)
 788                 swap->sequence += curseq;
 789
 790         if ((curseq - swap->sequence) <= (1<<23)) {
 791                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 792                         swap->sequence = curseq + 1;
 793                 } else {
 794                         DRM_DEBUG("Missed target sequence\n");
 795                         drm_vblank_put(dev, pipe);
 796                         return -EINVAL;
 797                 }
 798         }
 799
 800         if (swap->seqtype & _DRM_VBLANK_FLIP) {
 801                 swap->sequence--;
 802
 803                 if ((curseq - swap->sequence) <= (1<<23)) {
 804                         struct drm_drawable_info *drw;
 805
 806                         LOCK_TEST_WITH_RETURN(dev, file_priv);
 807
 808                         DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
 809
 810                         drw = drm_get_drawable_info(dev, swap->drawable);
 811
 812                         if (!drw) {
 813                                 DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock,
 814                                     irqflags);
 815                                 DRM_DEBUG("Invalid drawable ID %d\n",
 816                                           swap->drawable);
 817                                 drm_vblank_put(dev, pipe);
 818                                 return -EINVAL;
 819                         }
 820
 821                         i915_dispatch_vsync_flip(dev, drw, plane);
 822
 823                         DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 824
 825                         drm_vblank_put(dev, pipe);
 826                         return 0;
 827                 }
 828         }
 829
 830         DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
 831
 832         list_for_each(list, &dev_priv->vbl_swaps.head) {
 833                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 834
 835                 if (vbl_swap->drw_id == swap->drawable &&
 836                     vbl_swap->plane == plane &&
 837                     vbl_swap->sequence == swap->sequence) {
 838                         vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
 839                         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 840                         DRM_DEBUG("Already scheduled\n");
 841                         return 0;
 842                 }
 843         }
 844
 845         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 846
 847         if (dev_priv->swaps_pending >= 100) {
 848                 DRM_DEBUG("Too many swaps queued\n");
 849                 drm_vblank_put(dev, pipe);
 850                 return -EBUSY;
 851         }
 852
 853         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 854
 855         if (!vbl_swap) {
 856                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 857                 drm_vblank_put(dev, pipe);
 858                 return -ENOMEM;
 859         }
 860
 861         DRM_DEBUG("\n");
 862
 863         vbl_swap->drw_id = swap->drawable;
 864         vbl_swap->plane = plane;
 865         vbl_swap->sequence = swap->sequence;
 866         vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
 867
 868         if (vbl_swap->flip)
 869                 swap->sequence++;
 870
 871         DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
 872
 873         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
 874         dev_priv->swaps_pending++;
 875
 876         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 877
 878         return 0;
 879 }
 880
 881 /* drm_dma.h hooks
 882 */
 883 void i915_driver_irq_preinstall(struct drm_device * dev)
 884 {
 885         return;
 886 }
 887
 888 int i915_driver_irq_postinstall(struct drm_device * dev)
 889 {
 890         return 0;
 891 }
 892
 893 void i915_driver_irq_uninstall(struct drm_device * dev)
 894 {
 895         return;
 896 }