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  * These are the interrupts used by the driver
  38  */
  39 #define I915_INTERRUPT_ENABLE_MASK (I915_USER_INTERRUPT | \
  40                                     I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
  41                                     I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
  42
  43 static inline void
  44 i915_enable_irq(drm_i915_private_t *dev_priv, uint32_t mask)
  45 {
  46         if ((dev_priv->irq_mask_reg & mask) != 0) {
  47                 dev_priv->irq_mask_reg &= ~mask;
  48                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
  49                 (void) I915_READ(IMR);
  50         }
  51 }
  52
  53 static inline void
  54 i915_disable_irq(drm_i915_private_t *dev_priv, uint32_t mask)
  55 {
  56         if ((dev_priv->irq_mask_reg & mask) != mask) {
  57                 dev_priv->irq_mask_reg |= mask;
  58                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
  59                 (void) I915_READ(IMR);
  60         }
  61 }
  62
  63 /**
  64  * i915_get_pipe - return the the pipe associated with a given plane
  65  * @dev: DRM device
  66  * @plane: plane to look for
  67  *
  68  * The Intel Mesa & 2D drivers call the vblank routines with a plane number
  69  * rather than a pipe number, since they may not always be equal.  This routine
  70  * maps the given @plane back to a pipe number.
  71  */
  72 static int
  73 i915_get_pipe(struct drm_device *dev, int plane)
  74 {
  75         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
  76         u32 dspcntr;
  77
  78         dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);
  79
  80         return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
  81 }
  82
  83 /**
  84  * i915_get_plane - return the the plane associated with a given pipe
  85  * @dev: DRM device
  86  * @pipe: pipe to look for
  87  *
  88  * The Intel Mesa & 2D drivers call the vblank routines with a plane number
  89  * rather than a plane number, since they may not always be equal.  This routine
  90  * maps the given @pipe back to a plane number.
  91  */
  92 static int
  93 i915_get_plane(struct drm_device *dev, int pipe)
  94 {
  95         if (i915_get_pipe(dev, 0) == pipe)
  96                 return 0;
  97         return 1;
  98 }
  99
 100 /**
 101  * i915_pipe_enabled - check if a pipe is enabled
 102  * @dev: DRM device
 103  * @pipe: pipe to check
 104  *
 105  * Reading certain registers when the pipe is disabled can hang the chip.
 106  * Use this routine to make sure the PLL is running and the pipe is active
 107  * before reading such registers if unsure.
 108  */
 109 static int
 110 i915_pipe_enabled(struct drm_device *dev, int pipe)
 111 {
 112         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 113         unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
 114
 115         if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
 116                 return 1;
 117
 118         return 0;
 119 }
 120
 121 /**
 122  * Emit a synchronous flip.
 123  *
 124  * This function must be called with the drawable spinlock held.
 125  */
 126 static void
 127 i915_dispatch_vsync_flip(struct drm_device *dev, struct drm_drawable_info *drw,
 128                          int plane)
 129 {
 130         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 131         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
 132         u16 x1, y1, x2, y2;
 133         int pf_planes = 1 << plane;
 134
 135         DRM_SPINLOCK_ASSERT(&dev->drw_lock);
 136
 137         /* If the window is visible on the other plane, we have to flip on that
 138          * plane as well.
 139          */
 140         if (plane == 1) {
 141                 x1 = sarea_priv->planeA_x;
 142                 y1 = sarea_priv->planeA_y;
 143                 x2 = x1 + sarea_priv->planeA_w;
 144                 y2 = y1 + sarea_priv->planeA_h;
 145         } else {
 146                 x1 = sarea_priv->planeB_x;
 147                 y1 = sarea_priv->planeB_y;
 148                 x2 = x1 + sarea_priv->planeB_w;
 149                 y2 = y1 + sarea_priv->planeB_h;
 150         }
 151
 152         if (x2 > 0 && y2 > 0) {
 153                 int i, num_rects = drw->num_rects;
 154                 struct drm_clip_rect *rect = drw->rects;
 155
 156                 for (i = 0; i < num_rects; i++)
 157                         if (!(rect[i].x1 >= x2 || rect[i].y1 >= y2 ||
 158                               rect[i].x2 <= x1 || rect[i].y2 <= y1)) {
 159                                 pf_planes = 0x3;
 160
 161                                 break;
 162                         }
 163         }
 164
 165         i915_dispatch_flip(dev, pf_planes, 1);
 166 }
 167
 168 /**
 169  * Emit blits for scheduled buffer swaps.
 170  *
 171  * This function will be called with the HW lock held.
 172  */
 173 static void i915_vblank_tasklet(struct drm_device *dev)
 174 {
 175         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 176         struct list_head *list, *tmp, hits, *hit;
 177         int nhits, nrects, slice[2], upper[2], lower[2], i, num_pages;
 178         unsigned counter[2];
 179         struct drm_drawable_info *drw;
 180         drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
 181         u32 cpp = dev_priv->cpp,  offsets[3];
 182         u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
 183                                 XY_SRC_COPY_BLT_WRITE_ALPHA |
 184                                 XY_SRC_COPY_BLT_WRITE_RGB)
 185                              : XY_SRC_COPY_BLT_CMD;
 186         u32 src_pitch = sarea_priv->pitch * cpp;
 187         u32 dst_pitch = sarea_priv->pitch * cpp;
 188         /* COPY rop (0xcc), map cpp to magic color depth constants */
 189         u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
 190         RING_LOCALS;
 191
 192         if (IS_I965G(dev) && sarea_priv->front_tiled) {
 193                 cmd |= XY_SRC_COPY_BLT_DST_TILED;
 194                 dst_pitch >>= 2;
 195         }
 196         if (IS_I965G(dev) && sarea_priv->back_tiled) {
 197                 cmd |= XY_SRC_COPY_BLT_SRC_TILED;
 198                 src_pitch >>= 2;
 199         }
 200
 201         counter[0] = drm_vblank_count(dev, 0);
 202         counter[1] = drm_vblank_count(dev, 1);
 203
 204         DRM_DEBUG("\n");
 205
 206         INIT_LIST_HEAD(&hits);
 207
 208         nhits = nrects = 0;
 209
 210         /* No irqsave/restore necessary.  This tasklet may be run in an
 211          * interrupt context or normal context, but we don't have to worry
 212          * about getting interrupted by something acquiring the lock, because
 213          * we are the interrupt context thing that acquires the lock.
 214          */
 215         DRM_SPINLOCK(&dev_priv->swaps_lock);
 216
 217         /* Find buffer swaps scheduled for this vertical blank */
 218         list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
 219                 drm_i915_vbl_swap_t *vbl_swap =
 220                         list_entry(list, drm_i915_vbl_swap_t, head);
 221                 int pipe = i915_get_pipe(dev, vbl_swap->plane);
 222
 223                 if ((counter[pipe] - vbl_swap->sequence) > (1<<23))
 224                         continue;
 225
 226                 list_del(list);
 227                 dev_priv->swaps_pending--;
 228                 drm_vblank_put(dev, pipe);
 229
 230                 DRM_SPINUNLOCK(&dev_priv->swaps_lock);
 231                 DRM_SPINLOCK(&dev->drw_lock);
 232
 233                 drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
 234
 235                 if (!drw) {
 236                         DRM_SPINUNLOCK(&dev->drw_lock);
 237                         drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 238                         DRM_SPINLOCK(&dev_priv->swaps_lock);
 239                         continue;
 240                 }
 241
 242                 list_for_each(hit, &hits) {
 243                         drm_i915_vbl_swap_t *swap_cmp =
 244                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 245                         struct drm_drawable_info *drw_cmp =
 246                                 drm_get_drawable_info(dev, swap_cmp->drw_id);
 247
 248                         if (drw_cmp &&
 249                             drw_cmp->rects[0].y1 > drw->rects[0].y1) {
 250                                 list_add_tail(list, hit);
 251                                 break;
 252                         }
 253                 }
 254
 255                 DRM_SPINUNLOCK(&dev->drw_lock);
 256
 257                 /* List of hits was empty, or we reached the end of it */
 258                 if (hit == &hits)
 259                         list_add_tail(list, hits.prev);
 260
 261                 nhits++;
 262
 263                 DRM_SPINLOCK(&dev_priv->swaps_lock);
 264         }
 265
 266         DRM_SPINUNLOCK(&dev_priv->swaps_lock);
 267
 268         if (nhits == 0) {
 269                 return;
 270         }
 271
 272         i915_kernel_lost_context(dev);
 273
 274         upper[0] = upper[1] = 0;
 275         slice[0] = max(sarea_priv->planeA_h / nhits, 1);
 276         slice[1] = max(sarea_priv->planeB_h / nhits, 1);
 277         lower[0] = sarea_priv->planeA_y + slice[0];
 278         lower[1] = sarea_priv->planeB_y + slice[0];
 279
 280         offsets[0] = sarea_priv->front_offset;
 281         offsets[1] = sarea_priv->back_offset;
 282         offsets[2] = sarea_priv->third_offset;
 283         num_pages = sarea_priv->third_handle ? 3 : 2;
 284
 285         DRM_SPINLOCK(&dev->drw_lock);
 286
 287         /* Emit blits for buffer swaps, partitioning both outputs into as many
 288          * slices as there are buffer swaps scheduled in order to avoid tearing
 289          * (based on the assumption that a single buffer swap would always
 290          * complete before scanout starts).
 291          */
 292         for (i = 0; i++ < nhits;
 293              upper[0] = lower[0], lower[0] += slice[0],
 294              upper[1] = lower[1], lower[1] += slice[1]) {
 295                 int init_drawrect = 1;
 296
 297                 if (i == nhits)
 298                         lower[0] = lower[1] = sarea_priv->height;
 299
 300                 list_for_each(hit, &hits) {
 301                         drm_i915_vbl_swap_t *swap_hit =
 302                                 list_entry(hit, drm_i915_vbl_swap_t, head);
 303                         struct drm_clip_rect *rect;
 304                         int num_rects, plane, front, back;
 305                         unsigned short top, bottom;
 306
 307                         drw = drm_get_drawable_info(dev, swap_hit->drw_id);
 308
 309                         if (!drw)
 310                                 continue;
 311
 312                         plane = swap_hit->plane;
 313
 314                         if (swap_hit->flip) {
 315                                 i915_dispatch_vsync_flip(dev, drw, plane);
 316                                 continue;
 317                         }
 318
 319                         if (init_drawrect) {
 320                                 int width  = sarea_priv->width;
 321                                 int height = sarea_priv->height;
 322                                 if (IS_I965G(dev)) {
 323                                         BEGIN_LP_RING(4);
 324
 325                                         OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
 326                                         OUT_RING(0);
 327                                         OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
 328                                         OUT_RING(0);
 329
 330                                         ADVANCE_LP_RING();
 331                                 } else {
 332                                         BEGIN_LP_RING(6);
 333
 334                                         OUT_RING(GFX_OP_DRAWRECT_INFO);
 335                                         OUT_RING(0);
 336                                         OUT_RING(0);
 337                                         OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
 338                                         OUT_RING(0);
 339                                         OUT_RING(0);
 340
 341                                         ADVANCE_LP_RING();
 342                                 }
 343
 344                                 sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
 345
 346                                 init_drawrect = 0;
 347                         }
 348
 349                         rect = drw->rects;
 350                         top = upper[plane];
 351                         bottom = lower[plane];
 352
 353                         front = (dev_priv->sarea_priv->pf_current_page >>
 354                                  (2 * plane)) & 0x3;
 355                         back = (front + 1) % num_pages;
 356
 357                         for (num_rects = drw->num_rects; num_rects--; rect++) {
 358                                 int y1 = max(rect->y1, top);
 359                                 int y2 = min(rect->y2, bottom);
 360
 361                                 if (y1 >= y2)
 362                                         continue;
 363
 364                                 BEGIN_LP_RING(8);
 365
 366                                 OUT_RING(cmd);
 367                                 OUT_RING(ropcpp | dst_pitch);
 368                                 OUT_RING((y1 << 16) | rect->x1);
 369                                 OUT_RING((y2 << 16) | rect->x2);
 370                                 OUT_RING(offsets[front]);
 371                                 OUT_RING((y1 << 16) | rect->x1);
 372                                 OUT_RING(src_pitch);
 373                                 OUT_RING(offsets[back]);
 374
 375                                 ADVANCE_LP_RING();
 376                         }
 377                 }
 378         }
 379
 380         DRM_SPINUNLOCK(&dev->drw_lock);
 381
 382         list_for_each_safe(hit, tmp, &hits) {
 383                 drm_i915_vbl_swap_t *swap_hit =
 384                         list_entry(hit, drm_i915_vbl_swap_t, head);
 385
 386                 list_del(hit);
 387
 388                 drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
 389         }
 390 }
 391
 392 u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
 393 {
 394         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 395         unsigned long high_frame;
 396         unsigned long low_frame;
 397         u32 high1, high2, low, count;
 398         int pipe;
 399
 400         pipe = i915_get_pipe(dev, plane);
 401         high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
 402         low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
 403
 404         if (!i915_pipe_enabled(dev, pipe)) {
 405             DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
 406             return 0;
 407         }
 408
 409         /*
 410          * High & low register fields aren't synchronized, so make sure
 411          * we get a low value that's stable across two reads of the high
 412          * register.
 413          */
 414         do {
 415                 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 416                          PIPE_FRAME_HIGH_SHIFT);
 417                 low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 418                         PIPE_FRAME_LOW_SHIFT);
 419                 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 420                          PIPE_FRAME_HIGH_SHIFT);
 421         } while (high1 != high2);
 422
 423         count = (high1 << 8) | low;
 424
 425         return count;
 426 }
 427
 428 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 429 {
 430         struct drm_device *dev = (struct drm_device *) arg;
 431         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 432         u32 iir;
 433         u32 pipea_stats = 0, pipeb_stats = 0;
 434         int vblank = 0;
 435 #ifdef __linux__
 436         if (dev->pdev->msi_enabled)
 437                 I915_WRITE(IMR, ~0);
 438 #endif
 439         iir = I915_READ(IIR);
 440 #if 0
 441         DRM_DEBUG("flag=%08x\n", iir);
 442 #endif
 443         atomic_inc(&dev_priv->irq_received);
 444         if (iir == 0) {
 445 #ifdef __linux__
 446                 if (dev->pdev->msi_enabled) {
 447                         I915_WRITE(IMR, dev_priv->irq_mask_reg);
 448                         (void) I915_READ(IMR);
 449                 }
 450 #endif
 451                 return IRQ_NONE;
 452         }
 453
 454         /*
 455          * Clear the PIPE(A|B)STAT regs before the IIR otherwise
 456          * we may get extra interrupts.
 457          */
 458         if (iir & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT) {
 459                 pipea_stats = I915_READ(PIPEASTAT);
 460
 461                 /* The vblank interrupt gets enabled even if we didn't ask for
 462                    it, so make sure it's shut down again */
 463                 if (!(dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A))
 464                         pipea_stats &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
 465                                          PIPE_VBLANK_INTERRUPT_ENABLE);
 466                 else if (pipea_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
 467                                         PIPE_VBLANK_INTERRUPT_STATUS))
 468                 {
 469                         vblank++;
 470                         drm_handle_vblank(dev, i915_get_plane(dev, 0));
 471                 }
 472
 473                 I915_WRITE(PIPEASTAT, pipea_stats);
 474         }
 475         if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
 476                 pipeb_stats = I915_READ(PIPEBSTAT);
 477
 478                 /* The vblank interrupt gets enabled even if we didn't ask for
 479                    it, so make sure it's shut down again */
 480                 if (!(dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B))
 481                         pipeb_stats &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
 482                                          PIPE_VBLANK_INTERRUPT_ENABLE);
 483                 else if (pipeb_stats & (PIPE_START_VBLANK_INTERRUPT_STATUS|
 484                                         PIPE_VBLANK_INTERRUPT_STATUS))
 485                 {
 486                         vblank++;
 487                         drm_handle_vblank(dev, i915_get_plane(dev, 1));
 488                 }
 489
 490 #ifdef __linux__
 491 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 492                 if (pipeb_stats & I915_LEGACY_BLC_EVENT_ENABLE)
 493                         opregion_asle_intr(dev);
 494 #endif
 495 #endif
 496                 I915_WRITE(PIPEBSTAT, pipeb_stats);
 497         }
 498
 499 #ifdef __linux__
 500 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 501         if (iir & I915_ASLE_INTERRUPT)
 502                 opregion_asle_intr(dev);
 503 #endif
 504 #endif
 505
 506         if (dev_priv->sarea_priv)
 507             dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 508
 509         I915_WRITE(IIR, iir);
 510 #ifdef __linux__
 511         if (dev->pdev->msi_enabled)
 512                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 513 #endif
 514         (void) I915_READ(IIR); /* Flush posted writes */
 515
 516         if (iir & I915_USER_INTERRUPT) {
 517 #ifdef I915_HAVE_GEM
 518                 dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
 519 #endif
 520                 DRM_WAKEUP(&dev_priv->irq_queue);
 521 #ifdef I915_HAVE_FENCE
 522                 i915_fence_handler(dev);
 523 #endif
 524         }
 525
 526         if (vblank) {
 527                 if (dev_priv->swaps_pending > 0)
 528                         drm_locked_tasklet(dev, i915_vblank_tasklet);
 529         }
 530
 531         return IRQ_HANDLED;
 532 }
 533
 534 int i915_emit_irq(struct drm_device *dev)
 535 {
 536         drm_i915_private_t *dev_priv = dev->dev_private;
 537         RING_LOCALS;
 538
 539         i915_kernel_lost_context(dev);
 540
 541         DRM_DEBUG("\n");
 542
 543         i915_emit_breadcrumb(dev);
 544
 545         BEGIN_LP_RING(2);
 546         OUT_RING(0);
 547         OUT_RING(MI_USER_INTERRUPT);
 548         ADVANCE_LP_RING();
 549
 550         return dev_priv->counter;
 551 }
 552
 553 void i915_user_irq_on(drm_i915_private_t *dev_priv)
 554 {
 555         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 556         if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount == 1))
 557                 i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 558         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 559 }
 560
 561 void i915_user_irq_off(drm_i915_private_t *dev_priv)
 562 {
 563         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 564 #ifdef __linux__
 565         BUG_ON(dev_priv->irq_enabled && dev_priv->user_irq_refcount <= 0);
 566 #endif
 567         if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0))
 568                 i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 569         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 570 }
 571
 572
 573 int i915_wait_irq(struct drm_device * dev, int irq_nr)
 574 {
 575         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 576         int ret = 0;
 577
 578         if (!dev_priv) {
 579                 DRM_ERROR("called with no initialization\n");
 580                 return -EINVAL;
 581         }
 582
 583         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 584                   READ_BREADCRUMB(dev_priv));
 585
 586         if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
 587                 if (dev_priv->sarea_priv)
 588                         dev_priv->sarea_priv->last_dispatch =
 589                                 READ_BREADCRUMB(dev_priv);
 590                 return 0;
 591         }
 592
 593         i915_user_irq_on(dev_priv);
 594         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 595                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 596         i915_user_irq_off(dev_priv);
 597
 598         if (ret == -EBUSY) {
 599                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 600                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 601         }
 602
 603         if (dev_priv->sarea_priv)
 604                 dev_priv->sarea_priv->last_dispatch =
 605                         READ_BREADCRUMB(dev_priv);
 606         return ret;
 607 }
 608
 609 /* Needs the lock as it touches the ring.
 610  */
 611 int i915_irq_emit(struct drm_device *dev, void *data,
 612                          struct drm_file *file_priv)
 613 {
 614         drm_i915_private_t *dev_priv = dev->dev_private;
 615         drm_i915_irq_emit_t *emit = data;
 616         int result;
 617
 618         LOCK_TEST_WITH_RETURN(dev, file_priv);
 619
 620         if (!dev_priv) {
 621                 DRM_ERROR("called with no initialization\n");
 622                 return -EINVAL;
 623         }
 624
 625         result = i915_emit_irq(dev);
 626
 627         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 628                 DRM_ERROR("copy_to_user\n");
 629                 return -EFAULT;
 630         }
 631
 632         return 0;
 633 }
 634
 635 /* Doesn't need the hardware lock.
 636  */
 637 int i915_irq_wait(struct drm_device *dev, void *data,
 638                   struct drm_file *file_priv)
 639 {
 640         drm_i915_private_t *dev_priv = dev->dev_private;
 641         drm_i915_irq_wait_t *irqwait = data;
 642
 643         if (!dev_priv) {
 644                 DRM_ERROR("called with no initialization\n");
 645                 return -EINVAL;
 646         }
 647
 648         return i915_wait_irq(dev, irqwait->irq_seq);
 649 }
 650
 651 int i915_enable_vblank(struct drm_device *dev, int plane)
 652 {
 653         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 654         int pipe = i915_get_pipe(dev, plane);
 655         u32     pipestat_reg = 0;
 656         u32     mask_reg = 0;
 657         u32     pipestat;
 658
 659         switch (pipe) {
 660         case 0:
 661                 pipestat_reg = PIPEASTAT;
 662                 mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
 663                 break;
 664         case 1:
 665                 pipestat_reg = PIPEBSTAT;
 666                 mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 667                 break;
 668         default:
 669                 DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
 670                           pipe);
 671                 break;
 672         }
 673
 674         if (pipestat_reg)
 675         {
 676                 pipestat = I915_READ (pipestat_reg);
 677                 /*
 678                  * Older chips didn't have the start vblank interrupt,
 679                  * but
 680                  */
 681                 if (IS_I965G (dev))
 682                         pipestat |= PIPE_START_VBLANK_INTERRUPT_ENABLE;
 683                 else
 684                         pipestat |= PIPE_VBLANK_INTERRUPT_ENABLE;
 685                 /*
 686                  * Clear any pending status
 687                  */
 688                 pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
 689                              PIPE_VBLANK_INTERRUPT_STATUS);
 690                 I915_WRITE(pipestat_reg, pipestat);
 691         }
 692         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 693         i915_enable_irq(dev_priv, mask_reg);
 694         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 695
 696         return 0;
 697 }
 698
 699 void i915_disable_vblank(struct drm_device *dev, int plane)
 700 {
 701         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 702         int pipe = i915_get_pipe(dev, plane);
 703         u32     pipestat_reg = 0;
 704         u32     mask_reg = 0;
 705         u32     pipestat;
 706
 707         switch (pipe) {
 708         case 0:
 709                 pipestat_reg = PIPEASTAT;
 710                 mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
 711                 break;
 712         case 1:
 713                 pipestat_reg = PIPEBSTAT;
 714                 mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
 715                 break;
 716         default:
 717                 DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
 718                           pipe);
 719                 break;
 720         }
 721
 722         DRM_SPINLOCK(&dev_priv->user_irq_lock);
 723         i915_disable_irq(dev_priv, mask_reg);
 724         DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
 725
 726         if (pipestat_reg)
 727         {
 728                 pipestat = I915_READ (pipestat_reg);
 729                 pipestat &= ~(PIPE_START_VBLANK_INTERRUPT_ENABLE |
 730                               PIPE_VBLANK_INTERRUPT_ENABLE);
 731                 /*
 732                  * Clear any pending status
 733                  */
 734                 pipestat |= (PIPE_START_VBLANK_INTERRUPT_STATUS |
 735                              PIPE_VBLANK_INTERRUPT_STATUS);
 736                 I915_WRITE(pipestat_reg, pipestat);
 737                 (void) I915_READ(pipestat_reg);
 738         }
 739 }
 740
 741 static void i915_enable_interrupt (struct drm_device *dev)
 742 {
 743         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 744
 745         dev_priv->irq_mask_reg = ~0;
 746         I915_WRITE(IMR, dev_priv->irq_mask_reg);
 747         I915_WRITE(IER, I915_INTERRUPT_ENABLE_MASK);
 748         (void) I915_READ (IER);
 749
 750 #ifdef __linux__
 751 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
 752         opregion_enable_asle(dev);
 753 #endif
 754 #endif
 755
 756         dev_priv->irq_enabled = 1;
 757 }
 758
 759 /* Set the vblank monitor pipe
 760  */
 761 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 762                          struct drm_file *file_priv)
 763 {
 764         drm_i915_private_t *dev_priv = dev->dev_private;
 765
 766         if (!dev_priv) {
 767                 DRM_ERROR("called with no initialization\n");
 768                 return -EINVAL;
 769         }
 770
 771         return 0;
 772 }
 773
 774 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 775                          struct drm_file *file_priv)
 776 {
 777         drm_i915_private_t *dev_priv = dev->dev_private;
 778         drm_i915_vblank_pipe_t *pipe = data;
 779
 780         if (!dev_priv) {
 781                 DRM_ERROR("called with no initialization\n");
 782                 return -EINVAL;
 783         }
 784
 785         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 786
 787         return 0;
 788 }
 789
 790 /**
 791  * Schedule buffer swap at given vertical blank.
 792  */
 793 int i915_vblank_swap(struct drm_device *dev, void *data,
 794                      struct drm_file *file_priv)
 795 {
 796         drm_i915_private_t *dev_priv = dev->dev_private;
 797         drm_i915_vblank_swap_t *swap = data;
 798         drm_i915_vbl_swap_t *vbl_swap;
 799         unsigned int pipe, seqtype, curseq, plane;
 800         unsigned long irqflags;
 801         struct list_head *list;
 802         int ret;
 803
 804         if (!dev_priv) {
 805                 DRM_ERROR("%s called with no initialization\n", __func__);
 806                 return -EINVAL;
 807         }
 808
 809         if (!dev_priv->sarea_priv || dev_priv->sarea_priv->rotation) {
 810                 DRM_DEBUG("Rotation not supported\n");
 811                 return -EINVAL;
 812         }
 813
 814         if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
 815                              _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS |
 816                              _DRM_VBLANK_FLIP)) {
 817                 DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
 818                 return -EINVAL;
 819         }
 820
 821         plane = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
 822         pipe = i915_get_pipe(dev, plane);
 823
 824         seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
 825
 826         if (!(dev_priv->vblank_pipe & (1 << pipe))) {
 827                 DRM_ERROR("Invalid pipe %d\n", pipe);
 828                 return -EINVAL;
 829         }
 830
 831         DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
 832
 833         /* It makes no sense to schedule a swap for a drawable that doesn't have
 834          * valid information at this point. E.g. this could mean that the X
 835          * server is too old to push drawable information to the DRM, in which
 836          * case all such swaps would become ineffective.
 837          */
 838         if (!drm_get_drawable_info(dev, swap->drawable)) {
 839                 DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 840                 DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
 841                 return -EINVAL;
 842         }
 843
 844         DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 845
 846         /*
 847          * We take the ref here and put it when the swap actually completes
 848          * in the tasklet.
 849          */
 850         ret = drm_vblank_get(dev, pipe);
 851         if (ret)
 852                 return ret;
 853         curseq = drm_vblank_count(dev, pipe);
 854
 855         if (seqtype == _DRM_VBLANK_RELATIVE)
 856                 swap->sequence += curseq;
 857
 858         if ((curseq - swap->sequence) <= (1<<23)) {
 859                 if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
 860                         swap->sequence = curseq + 1;
 861                 } else {
 862                         DRM_DEBUG("Missed target sequence\n");
 863                         drm_vblank_put(dev, pipe);
 864                         return -EINVAL;
 865                 }
 866         }
 867
 868         if (swap->seqtype & _DRM_VBLANK_FLIP) {
 869                 swap->sequence--;
 870
 871                 if ((curseq - swap->sequence) <= (1<<23)) {
 872                         struct drm_drawable_info *drw;
 873
 874                         LOCK_TEST_WITH_RETURN(dev, file_priv);
 875
 876                         DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
 877
 878                         drw = drm_get_drawable_info(dev, swap->drawable);
 879
 880                         if (!drw) {
 881                                 DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock,
 882                                     irqflags);
 883                                 DRM_DEBUG("Invalid drawable ID %d\n",
 884                                           swap->drawable);
 885                                 drm_vblank_put(dev, pipe);
 886                                 return -EINVAL;
 887                         }
 888
 889                         i915_dispatch_vsync_flip(dev, drw, plane);
 890
 891                         DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
 892
 893                         drm_vblank_put(dev, pipe);
 894                         return 0;
 895                 }
 896         }
 897
 898         DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
 899
 900         list_for_each(list, &dev_priv->vbl_swaps.head) {
 901                 vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
 902
 903                 if (vbl_swap->drw_id == swap->drawable &&
 904                     vbl_swap->plane == plane &&
 905                     vbl_swap->sequence == swap->sequence) {
 906                         vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
 907                         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 908                         DRM_DEBUG("Already scheduled\n");
 909                         return 0;
 910                 }
 911         }
 912
 913         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 914
 915         if (dev_priv->swaps_pending >= 100) {
 916                 DRM_DEBUG("Too many swaps queued\n");
 917                 drm_vblank_put(dev, pipe);
 918                 return -EBUSY;
 919         }
 920
 921         vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
 922
 923         if (!vbl_swap) {
 924                 DRM_ERROR("Failed to allocate memory to queue swap\n");
 925                 drm_vblank_put(dev, pipe);
 926                 return -ENOMEM;
 927         }
 928
 929         DRM_DEBUG("\n");
 930
 931         vbl_swap->drw_id = swap->drawable;
 932         vbl_swap->plane = plane;
 933         vbl_swap->sequence = swap->sequence;
 934         vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
 935
 936         if (vbl_swap->flip)
 937                 swap->sequence++;
 938
 939         DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
 940
 941         list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
 942         dev_priv->swaps_pending++;
 943
 944         DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
 945
 946         return 0;
 947 }
 948
 949 /* drm_dma.h hooks
 950 */
 951 void i915_driver_irq_preinstall(struct drm_device * dev)
 952 {
 953         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 954
 955         I915_WRITE(HWSTAM, 0xeffe);
 956         I915_WRITE(IMR, 0xffffffff);
 957         I915_WRITE(IER, 0x0);
 958 }
 959
 960 int i915_driver_irq_postinstall(struct drm_device * dev)
 961 {
 962         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 963         int ret, num_pipes = 2;
 964
 965         INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
 966         dev_priv->swaps_pending = 0;
 967
 968         dev_priv->user_irq_refcount = 0;
 969         dev_priv->irq_mask_reg = ~0;
 970
 971         ret = drm_vblank_init(dev, num_pipes);
 972         if (ret)
 973                 return ret;
 974
 975         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 976         dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
 977
 978         i915_enable_interrupt(dev);
 979         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 980
 981         /*
 982          * Initialize the hardware status page IRQ location.
 983          */
 984
 985         I915_WRITE(INSTPM, (1 << 5) | (1 << 21));
 986         return 0;
 987 }
 988
 989 void i915_driver_irq_uninstall(struct drm_device * dev)
 990 {
 991         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 992         u32 temp;
 993
 994         if (!dev_priv)
 995                 return;
 996
 997         dev_priv->vblank_pipe = 0;
 998
 999         dev_priv->irq_enabled = 0;
1000         I915_WRITE(HWSTAM, 0xffffffff);
1001         I915_WRITE(IMR, 0xffffffff);
1002         I915_WRITE(IER, 0x0);
1003
1004         temp = I915_READ(PIPEASTAT);
1005         I915_WRITE(PIPEASTAT, temp);
1006         temp = I915_READ(PIPEBSTAT);
1007         I915_WRITE(PIPEBSTAT, temp);
1008         temp = I915_READ(IIR);
1009         I915_WRITE(IIR, temp);
1010 }