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   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 #include "intel_drv.h"
  34
  35 #define MAX_NOPID ((u32)~0)
  36
  37 /**
  38  * Interrupts that are always left unmasked.
  39  *
  40  * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
  41  * we leave them always unmasked in IMR and then control enabling them through
  42  * PIPESTAT alone.
  43  */
  44 #define I915_INTERRUPT_ENABLE_FIX (I915_ASLE_INTERRUPT | \
  45                                    I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |  \
  46                                    I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
  47
  48 /** Interrupts that we mask and unmask at runtime. */
  49 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
  50
  51 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
  52                                  PIPE_VBLANK_INTERRUPT_STATUS)
  53
  54 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
  55                                  PIPE_VBLANK_INTERRUPT_ENABLE)
  56
  57 #define DRM_I915_VBLANK_PIPE_ALL        (DRM_I915_VBLANK_PIPE_A | \
  58                                          DRM_I915_VBLANK_PIPE_B)
  59
  60 void
  61 igdng_enable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  62 {
  63         if ((dev_priv->gt_irq_mask_reg & mask) != 0) {
  64                 dev_priv->gt_irq_mask_reg &= ~mask;
  65                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  66                 (void) I915_READ(GTIMR);
  67         }
  68 }
  69
  70 static inline void
  71 igdng_disable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  72 {
  73         if ((dev_priv->gt_irq_mask_reg & mask) != mask) {
  74                 dev_priv->gt_irq_mask_reg |= mask;
  75                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  76                 (void) I915_READ(GTIMR);
  77         }
  78 }
  79
  80 /* For display hotplug interrupt */
  81 void
  82 igdng_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  83 {
  84         if ((dev_priv->irq_mask_reg & mask) != 0) {
  85                 dev_priv->irq_mask_reg &= ~mask;
  86                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
  87                 (void) I915_READ(DEIMR);
  88         }
  89 }
  90
  91 static inline void
  92 igdng_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  93 {
  94         if ((dev_priv->irq_mask_reg & mask) != mask) {
  95                 dev_priv->irq_mask_reg |= mask;
  96                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
  97                 (void) I915_READ(DEIMR);
  98         }
  99 }
 100
 101 void
 102 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
 103 {
 104         if ((dev_priv->irq_mask_reg & mask) != 0) {
 105                 dev_priv->irq_mask_reg &= ~mask;
 106                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 107                 (void) I915_READ(IMR);
 108         }
 109 }
 110
 111 static inline void
 112 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
 113 {
 114         if ((dev_priv->irq_mask_reg & mask) != mask) {
 115                 dev_priv->irq_mask_reg |= mask;
 116                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 117                 (void) I915_READ(IMR);
 118         }
 119 }
 120
 121 static inline u32
 122 i915_pipestat(int pipe)
 123 {
 124         if (pipe == 0)
 125                 return PIPEASTAT;
 126         if (pipe == 1)
 127                 return PIPEBSTAT;
 128         BUG();
 129 }
 130
 131 void
 132 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 133 {
 134         if ((dev_priv->pipestat[pipe] & mask) != mask) {
 135                 u32 reg = i915_pipestat(pipe);
 136
 137                 dev_priv->pipestat[pipe] |= mask;
 138                 /* Enable the interrupt, clear any pending status */
 139                 I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
 140                 (void) I915_READ(reg);
 141         }
 142 }
 143
 144 void
 145 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 146 {
 147         if ((dev_priv->pipestat[pipe] & mask) != 0) {
 148                 u32 reg = i915_pipestat(pipe);
 149
 150                 dev_priv->pipestat[pipe] &= ~mask;
 151                 I915_WRITE(reg, dev_priv->pipestat[pipe]);
 152                 (void) I915_READ(reg);
 153         }
 154 }
 155
 156 /**
 157  * i915_pipe_enabled - check if a pipe is enabled
 158  * @dev: DRM device
 159  * @pipe: pipe to check
 160  *
 161  * Reading certain registers when the pipe is disabled can hang the chip.
 162  * Use this routine to make sure the PLL is running and the pipe is active
 163  * before reading such registers if unsure.
 164  */
 165 static int
 166 i915_pipe_enabled(struct drm_device *dev, int pipe)
 167 {
 168         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 169         unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
 170
 171         if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
 172                 return 1;
 173
 174         return 0;
 175 }
 176
 177 /* Called from drm generic code, passed a 'crtc', which
 178  * we use as a pipe index
 179  */
 180 u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 181 {
 182         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 183         unsigned long high_frame;
 184         unsigned long low_frame;
 185         u32 high1, high2, low, count;
 186
 187         high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
 188         low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
 189
 190         if (!i915_pipe_enabled(dev, pipe)) {
 191                 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
 192                 return 0;
 193         }
 194
 195         /*
 196          * High & low register fields aren't synchronized, so make sure
 197          * we get a low value that's stable across two reads of the high
 198          * register.
 199          */
 200         do {
 201                 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 202                          PIPE_FRAME_HIGH_SHIFT);
 203                 low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 204                         PIPE_FRAME_LOW_SHIFT);
 205                 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 206                          PIPE_FRAME_HIGH_SHIFT);
 207         } while (high1 != high2);
 208
 209         count = (high1 << 8) | low;
 210
 211         return count;
 212 }
 213
 214 u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 215 {
 216         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 217         int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
 218
 219         if (!i915_pipe_enabled(dev, pipe)) {
 220                 DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
 221                 return 0;
 222         }
 223
 224         return I915_READ(reg);
 225 }
 226
 227 /*
 228  * Handle hotplug events outside the interrupt handler proper.
 229  */
 230 static void i915_hotplug_work_func(struct work_struct *work)
 231 {
 232         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 233                                                     hotplug_work);
 234         struct drm_device *dev = dev_priv->dev;
 235
 236         /* Just fire off a uevent and let userspace tell us what to do */
 237         drm_sysfs_hotplug_event(dev);
 238 }
 239
 240 irqreturn_t igdng_irq_handler(struct drm_device *dev)
 241 {
 242         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 243         int ret = IRQ_NONE;
 244         u32 de_iir, gt_iir;
 245         u32 new_de_iir, new_gt_iir;
 246         struct drm_i915_master_private *master_priv;
 247
 248         de_iir = I915_READ(DEIIR);
 249         gt_iir = I915_READ(GTIIR);
 250
 251         for (;;) {
 252                 if (de_iir == 0 && gt_iir == 0)
 253                         break;
 254
 255                 ret = IRQ_HANDLED;
 256
 257                 I915_WRITE(DEIIR, de_iir);
 258                 new_de_iir = I915_READ(DEIIR);
 259                 I915_WRITE(GTIIR, gt_iir);
 260                 new_gt_iir = I915_READ(GTIIR);
 261
 262                 if (dev->primary->master) {
 263                         master_priv = dev->primary->master->driver_priv;
 264                         if (master_priv->sarea_priv)
 265                                 master_priv->sarea_priv->last_dispatch =
 266                                         READ_BREADCRUMB(dev_priv);
 267                 }
 268
 269                 if (gt_iir & GT_USER_INTERRUPT) {
 270                         dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
 271                         DRM_WAKEUP(&dev_priv->irq_queue);
 272                 }
 273
 274                 de_iir = new_de_iir;
 275                 gt_iir = new_gt_iir;
 276         }
 277
 278         return ret;
 279 }
 280
 281 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 282 {
 283         struct drm_device *dev = (struct drm_device *) arg;
 284         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 285         struct drm_i915_master_private *master_priv;
 286         u32 iir, new_iir;
 287         u32 pipea_stats, pipeb_stats;
 288         u32 vblank_status;
 289         u32 vblank_enable;
 290         int vblank = 0;
 291         unsigned long irqflags;
 292         int irq_received;
 293         int ret = IRQ_NONE;
 294
 295         atomic_inc(&dev_priv->irq_received);
 296
 297         if (IS_IGDNG(dev))
 298                 return igdng_irq_handler(dev);
 299
 300         iir = I915_READ(IIR);
 301
 302         if (IS_I965G(dev)) {
 303                 vblank_status = I915_START_VBLANK_INTERRUPT_STATUS;
 304                 vblank_enable = PIPE_START_VBLANK_INTERRUPT_ENABLE;
 305         } else {
 306                 vblank_status = I915_VBLANK_INTERRUPT_STATUS;
 307                 vblank_enable = I915_VBLANK_INTERRUPT_ENABLE;
 308         }
 309
 310         for (;;) {
 311                 irq_received = iir != 0;
 312
 313                 /* Can't rely on pipestat interrupt bit in iir as it might
 314                  * have been cleared after the pipestat interrupt was received.
 315                  * It doesn't set the bit in iir again, but it still produces
 316                  * interrupts (for non-MSI).
 317                  */
 318                 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 319                 pipea_stats = I915_READ(PIPEASTAT);
 320                 pipeb_stats = I915_READ(PIPEBSTAT);
 321
 322                 /*
 323                  * Clear the PIPE(A|B)STAT regs before the IIR
 324                  */
 325                 if (pipea_stats & 0x8000ffff) {
 326                         I915_WRITE(PIPEASTAT, pipea_stats);
 327                         irq_received = 1;
 328                 }
 329
 330                 if (pipeb_stats & 0x8000ffff) {
 331                         I915_WRITE(PIPEBSTAT, pipeb_stats);
 332                         irq_received = 1;
 333                 }
 334                 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 335
 336                 if (!irq_received)
 337                         break;
 338
 339                 ret = IRQ_HANDLED;
 340
 341                 /* Consume port.  Then clear IIR or we'll miss events */
 342                 if ((I915_HAS_HOTPLUG(dev)) &&
 343                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
 344                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
 345
 346                         DRM_DEBUG("hotplug event received, stat 0x%08x\n",
 347                                   hotplug_status);
 348                         if (hotplug_status & dev_priv->hotplug_supported_mask)
 349                                 schedule_work(&dev_priv->hotplug_work);
 350
 351                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 352                         I915_READ(PORT_HOTPLUG_STAT);
 353                 }
 354
 355                 I915_WRITE(IIR, iir);
 356                 new_iir = I915_READ(IIR); /* Flush posted writes */
 357
 358                 if (dev->primary->master) {
 359                         master_priv = dev->primary->master->driver_priv;
 360                         if (master_priv->sarea_priv)
 361                                 master_priv->sarea_priv->last_dispatch =
 362                                         READ_BREADCRUMB(dev_priv);
 363                 }
 364
 365                 if (iir & I915_USER_INTERRUPT) {
 366                         dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
 367                         DRM_WAKEUP(&dev_priv->irq_queue);
 368                 }
 369
 370                 if (pipea_stats & vblank_status) {
 371                         vblank++;
 372                         drm_handle_vblank(dev, 0);
 373                 }
 374
 375                 if (pipeb_stats & vblank_status) {
 376                         vblank++;
 377                         drm_handle_vblank(dev, 1);
 378                 }
 379
 380                 if ((pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
 381                     (iir & I915_ASLE_INTERRUPT))
 382                         opregion_asle_intr(dev);
 383
 384                 /* With MSI, interrupts are only generated when iir
 385                  * transitions from zero to nonzero.  If another bit got
 386                  * set while we were handling the existing iir bits, then
 387                  * we would never get another interrupt.
 388                  *
 389                  * This is fine on non-MSI as well, as if we hit this path
 390                  * we avoid exiting the interrupt handler only to generate
 391                  * another one.
 392                  *
 393                  * Note that for MSI this could cause a stray interrupt report
 394                  * if an interrupt landed in the time between writing IIR and
 395                  * the posting read.  This should be rare enough to never
 396                  * trigger the 99% of 100,000 interrupts test for disabling
 397                  * stray interrupts.
 398                  */
 399                 iir = new_iir;
 400         }
 401
 402         return ret;
 403 }
 404
 405 static int i915_emit_irq(struct drm_device * dev)
 406 {
 407         drm_i915_private_t *dev_priv = dev->dev_private;
 408         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 409         RING_LOCALS;
 410
 411         i915_kernel_lost_context(dev);
 412
 413         DRM_DEBUG("\n");
 414
 415         dev_priv->counter++;
 416         if (dev_priv->counter > 0x7FFFFFFFUL)
 417                 dev_priv->counter = 1;
 418         if (master_priv->sarea_priv)
 419                 master_priv->sarea_priv->last_enqueue = dev_priv->counter;
 420
 421         BEGIN_LP_RING(4);
 422         OUT_RING(MI_STORE_DWORD_INDEX);
 423         OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 424         OUT_RING(dev_priv->counter);
 425         OUT_RING(MI_USER_INTERRUPT);
 426         ADVANCE_LP_RING();
 427
 428         return dev_priv->counter;
 429 }
 430
 431 void i915_user_irq_get(struct drm_device *dev)
 432 {
 433         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 434         unsigned long irqflags;
 435
 436         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 437         if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1)) {
 438                 if (IS_IGDNG(dev))
 439                         igdng_enable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 440                 else
 441                         i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 442         }
 443         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 444 }
 445
 446 void i915_user_irq_put(struct drm_device *dev)
 447 {
 448         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 449         unsigned long irqflags;
 450
 451         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 452         BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0);
 453         if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
 454                 if (IS_IGDNG(dev))
 455                         igdng_disable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 456                 else
 457                         i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 458         }
 459         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 460 }
 461
 462 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 463 {
 464         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 465         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 466         int ret = 0;
 467
 468         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 469                   READ_BREADCRUMB(dev_priv));
 470
 471         if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
 472                 if (master_priv->sarea_priv)
 473                         master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 474                 return 0;
 475         }
 476
 477         if (master_priv->sarea_priv)
 478                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 479
 480         i915_user_irq_get(dev);
 481         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 482                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 483         i915_user_irq_put(dev);
 484
 485         if (ret == -EBUSY) {
 486                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 487                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 488         }
 489
 490         return ret;
 491 }
 492
 493 /* Needs the lock as it touches the ring.
 494  */
 495 int i915_irq_emit(struct drm_device *dev, void *data,
 496                          struct drm_file *file_priv)
 497 {
 498         drm_i915_private_t *dev_priv = dev->dev_private;
 499         drm_i915_irq_emit_t *emit = data;
 500         int result;
 501
 502         if (!dev_priv || !dev_priv->ring.virtual_start) {
 503                 DRM_ERROR("called with no initialization\n");
 504                 return -EINVAL;
 505         }
 506
 507         RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
 508
 509         mutex_lock(&dev->struct_mutex);
 510         result = i915_emit_irq(dev);
 511         mutex_unlock(&dev->struct_mutex);
 512
 513         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 514                 DRM_ERROR("copy_to_user\n");
 515                 return -EFAULT;
 516         }
 517
 518         return 0;
 519 }
 520
 521 /* Doesn't need the hardware lock.
 522  */
 523 int i915_irq_wait(struct drm_device *dev, void *data,
 524                          struct drm_file *file_priv)
 525 {
 526         drm_i915_private_t *dev_priv = dev->dev_private;
 527         drm_i915_irq_wait_t *irqwait = data;
 528
 529         if (!dev_priv) {
 530                 DRM_ERROR("called with no initialization\n");
 531                 return -EINVAL;
 532         }
 533
 534         return i915_wait_irq(dev, irqwait->irq_seq);
 535 }
 536
 537 /* Called from drm generic code, passed 'crtc' which
 538  * we use as a pipe index
 539  */
 540 int i915_enable_vblank(struct drm_device *dev, int pipe)
 541 {
 542         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 543         unsigned long irqflags;
 544         int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
 545         u32 pipeconf;
 546
 547         pipeconf = I915_READ(pipeconf_reg);
 548         if (!(pipeconf & PIPEACONF_ENABLE))
 549                 return -EINVAL;
 550
 551         if (IS_IGDNG(dev))
 552                 return 0;
 553
 554         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 555         if (IS_I965G(dev))
 556                 i915_enable_pipestat(dev_priv, pipe,
 557                                      PIPE_START_VBLANK_INTERRUPT_ENABLE);
 558         else
 559                 i915_enable_pipestat(dev_priv, pipe,
 560                                      PIPE_VBLANK_INTERRUPT_ENABLE);
 561         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 562         return 0;
 563 }
 564
 565 /* Called from drm generic code, passed 'crtc' which
 566  * we use as a pipe index
 567  */
 568 void i915_disable_vblank(struct drm_device *dev, int pipe)
 569 {
 570         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 571         unsigned long irqflags;
 572
 573         if (IS_IGDNG(dev))
 574                 return;
 575
 576         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 577         i915_disable_pipestat(dev_priv, pipe,
 578                               PIPE_VBLANK_INTERRUPT_ENABLE |
 579                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
 580         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 581 }
 582
 583 void i915_enable_interrupt (struct drm_device *dev)
 584 {
 585         struct drm_i915_private *dev_priv = dev->dev_private;
 586
 587         if (!IS_IGDNG(dev))
 588                 opregion_enable_asle(dev);
 589         dev_priv->irq_enabled = 1;
 590 }
 591
 592
 593 /* Set the vblank monitor pipe
 594  */
 595 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 596                          struct drm_file *file_priv)
 597 {
 598         drm_i915_private_t *dev_priv = dev->dev_private;
 599
 600         if (!dev_priv) {
 601                 DRM_ERROR("called with no initialization\n");
 602                 return -EINVAL;
 603         }
 604
 605         return 0;
 606 }
 607
 608 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 609                          struct drm_file *file_priv)
 610 {
 611         drm_i915_private_t *dev_priv = dev->dev_private;
 612         drm_i915_vblank_pipe_t *pipe = data;
 613
 614         if (!dev_priv) {
 615                 DRM_ERROR("called with no initialization\n");
 616                 return -EINVAL;
 617         }
 618
 619         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 620
 621         return 0;
 622 }
 623
 624 /**
 625  * Schedule buffer swap at given vertical blank.
 626  */
 627 int i915_vblank_swap(struct drm_device *dev, void *data,
 628                      struct drm_file *file_priv)
 629 {
 630         /* The delayed swap mechanism was fundamentally racy, and has been
 631          * removed.  The model was that the client requested a delayed flip/swap
 632          * from the kernel, then waited for vblank before continuing to perform
 633          * rendering.  The problem was that the kernel might wake the client
 634          * up before it dispatched the vblank swap (since the lock has to be
 635          * held while touching the ringbuffer), in which case the client would
 636          * clear and start the next frame before the swap occurred, and
 637          * flicker would occur in addition to likely missing the vblank.
 638          *
 639          * In the absence of this ioctl, userland falls back to a correct path
 640          * of waiting for a vblank, then dispatching the swap on its own.
 641          * Context switching to userland and back is plenty fast enough for
 642          * meeting the requirements of vblank swapping.
 643          */
 644         return -EINVAL;
 645 }
 646
 647 /* drm_dma.h hooks
 648 */
 649 static void igdng_irq_preinstall(struct drm_device *dev)
 650 {
 651         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 652
 653         I915_WRITE(HWSTAM, 0xeffe);
 654
 655         /* XXX hotplug from PCH */
 656
 657         I915_WRITE(DEIMR, 0xffffffff);
 658         I915_WRITE(DEIER, 0x0);
 659         (void) I915_READ(DEIER);
 660
 661         /* and GT */
 662         I915_WRITE(GTIMR, 0xffffffff);
 663         I915_WRITE(GTIER, 0x0);
 664         (void) I915_READ(GTIER);
 665 }
 666
 667 static int igdng_irq_postinstall(struct drm_device *dev)
 668 {
 669         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 670         /* enable kind of interrupts always enabled */
 671         u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
 672         u32 render_mask = GT_USER_INTERRUPT;
 673
 674         dev_priv->irq_mask_reg = ~display_mask;
 675         dev_priv->de_irq_enable_reg = display_mask;
 676
 677         /* should always can generate irq */
 678         I915_WRITE(DEIIR, I915_READ(DEIIR));
 679         I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
 680         I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
 681         (void) I915_READ(DEIER);
 682
 683         /* user interrupt should be enabled, but masked initial */
 684         dev_priv->gt_irq_mask_reg = 0xffffffff;
 685         dev_priv->gt_irq_enable_reg = render_mask;
 686
 687         I915_WRITE(GTIIR, I915_READ(GTIIR));
 688         I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
 689         I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
 690         (void) I915_READ(GTIER);
 691
 692         return 0;
 693 }
 694
 695 void i915_driver_irq_preinstall(struct drm_device * dev)
 696 {
 697         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 698
 699         atomic_set(&dev_priv->irq_received, 0);
 700
 701         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
 702
 703         if (IS_IGDNG(dev)) {
 704                 igdng_irq_preinstall(dev);
 705                 return;
 706         }
 707
 708         if (I915_HAS_HOTPLUG(dev)) {
 709                 I915_WRITE(PORT_HOTPLUG_EN, 0);
 710                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
 711         }
 712
 713         I915_WRITE(HWSTAM, 0xeffe);
 714         I915_WRITE(PIPEASTAT, 0);
 715         I915_WRITE(PIPEBSTAT, 0);
 716         I915_WRITE(IMR, 0xffffffff);
 717         I915_WRITE(IER, 0x0);
 718         (void) I915_READ(IER);
 719 }
 720
 721 int i915_driver_irq_postinstall(struct drm_device *dev)
 722 {
 723         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 724         u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
 725
 726         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 727
 728         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 729
 730         if (IS_IGDNG(dev))
 731                 return igdng_irq_postinstall(dev);
 732
 733         /* Unmask the interrupts that we always want on. */
 734         dev_priv->irq_mask_reg = ~I915_INTERRUPT_ENABLE_FIX;
 735
 736         dev_priv->pipestat[0] = 0;
 737         dev_priv->pipestat[1] = 0;
 738
 739         if (I915_HAS_HOTPLUG(dev)) {
 740                 u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
 741
 742                 /* Leave other bits alone */
 743                 hotplug_en |= HOTPLUG_EN_MASK;
 744                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 745
 746                 dev_priv->hotplug_supported_mask = CRT_HOTPLUG_INT_STATUS |
 747                         TV_HOTPLUG_INT_STATUS | SDVOC_HOTPLUG_INT_STATUS |
 748                         SDVOB_HOTPLUG_INT_STATUS;
 749                 if (IS_G4X(dev)) {
 750                         dev_priv->hotplug_supported_mask |=
 751                                 HDMIB_HOTPLUG_INT_STATUS |
 752                                 HDMIC_HOTPLUG_INT_STATUS |
 753                                 HDMID_HOTPLUG_INT_STATUS;
 754                 }
 755                 /* Enable in IER... */
 756                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
 757                 /* and unmask in IMR */
 758                 i915_enable_irq(dev_priv, I915_DISPLAY_PORT_INTERRUPT);
 759         }
 760
 761         /* Disable pipe interrupt enables, clear pending pipe status */
 762         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
 763         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
 764         /* Clear pending interrupt status */
 765         I915_WRITE(IIR, I915_READ(IIR));
 766
 767         I915_WRITE(IER, enable_mask);
 768         I915_WRITE(IMR, dev_priv->irq_mask_reg);
 769         (void) I915_READ(IER);
 770
 771         opregion_enable_asle(dev);
 772
 773         return 0;
 774 }
 775
 776 static void igdng_irq_uninstall(struct drm_device *dev)
 777 {
 778         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 779         I915_WRITE(HWSTAM, 0xffffffff);
 780
 781         I915_WRITE(DEIMR, 0xffffffff);
 782         I915_WRITE(DEIER, 0x0);
 783         I915_WRITE(DEIIR, I915_READ(DEIIR));
 784
 785         I915_WRITE(GTIMR, 0xffffffff);
 786         I915_WRITE(GTIER, 0x0);
 787         I915_WRITE(GTIIR, I915_READ(GTIIR));
 788 }
 789
 790 void i915_driver_irq_uninstall(struct drm_device * dev)
 791 {
 792         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 793
 794         if (!dev_priv)
 795                 return;
 796
 797         dev_priv->vblank_pipe = 0;
 798
 799         if (IS_IGDNG(dev)) {
 800                 igdng_irq_uninstall(dev);
 801                 return;
 802         }
 803
 804         if (I915_HAS_HOTPLUG(dev)) {
 805                 I915_WRITE(PORT_HOTPLUG_EN, 0);
 806                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
 807         }
 808
 809         I915_WRITE(HWSTAM, 0xffffffff);
 810         I915_WRITE(PIPEASTAT, 0);
 811         I915_WRITE(PIPEBSTAT, 0);
 812         I915_WRITE(IMR, 0xffffffff);
 813         I915_WRITE(IER, 0x0);
 814
 815         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
 816         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
 817         I915_WRITE(IIR, I915_READ(IIR));
 818 }