drivers/gpu/drm/i915/i915_irq.c

   1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2  */
   3 /*
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #include <linux/sysrq.h>
  30 #include <linux/slab.h>
  31 #include "drmP.h"
  32 #include "drm.h"
  33 #include "i915_drm.h"
  34 #include "i915_drv.h"
  35 #include "i915_trace.h"
  36 #include "intel_drv.h"
  37
  38 #define MAX_NOPID ((u32)~0)
  39
  40 /**
  41  * Interrupts that are always left unmasked.
  42  *
  43  * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
  44  * we leave them always unmasked in IMR and then control enabling them through
  45  * PIPESTAT alone.
  46  */
  47 #define I915_INTERRUPT_ENABLE_FIX                       \
  48         (I915_ASLE_INTERRUPT |                          \
  49          I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |          \
  50          I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |          \
  51          I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |  \
  52          I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |  \
  53          I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
  54
  55 /** Interrupts that we mask and unmask at runtime. */
  56 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT | I915_BSD_USER_INTERRUPT)
  57
  58 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
  59                                  PIPE_VBLANK_INTERRUPT_STATUS)
  60
  61 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
  62                                  PIPE_VBLANK_INTERRUPT_ENABLE)
  63
  64 #define DRM_I915_VBLANK_PIPE_ALL        (DRM_I915_VBLANK_PIPE_A | \
  65                                          DRM_I915_VBLANK_PIPE_B)
  66
  67 /* For display hotplug interrupt */
  68 static void
  69 ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  70 {
  71         if ((dev_priv->irq_mask & mask) != 0) {
  72                 dev_priv->irq_mask &= ~mask;
  73                 I915_WRITE(DEIMR, dev_priv->irq_mask);
  74                 POSTING_READ(DEIMR);
  75         }
  76 }
  77
  78 static inline void
  79 ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  80 {
  81         if ((dev_priv->irq_mask & mask) != mask) {
  82                 dev_priv->irq_mask |= mask;
  83                 I915_WRITE(DEIMR, dev_priv->irq_mask);
  84                 POSTING_READ(DEIMR);
  85         }
  86 }
  87
  88 void
  89 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
  90 {
  91         if ((dev_priv->pipestat[pipe] & mask) != mask) {
  92                 u32 reg = PIPESTAT(pipe);
  93
  94                 dev_priv->pipestat[pipe] |= mask;
  95                 /* Enable the interrupt, clear any pending status */
  96                 I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
  97                 POSTING_READ(reg);
  98         }
  99 }
 100
 101 void
 102 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 103 {
 104         if ((dev_priv->pipestat[pipe] & mask) != 0) {
 105                 u32 reg = PIPESTAT(pipe);
 106
 107                 dev_priv->pipestat[pipe] &= ~mask;
 108                 I915_WRITE(reg, dev_priv->pipestat[pipe]);
 109                 POSTING_READ(reg);
 110         }
 111 }
 112
 113 /**
 114  * intel_enable_asle - enable ASLE interrupt for OpRegion
 115  */
 116 void intel_enable_asle(struct drm_device *dev)
 117 {
 118         drm_i915_private_t *dev_priv = dev->dev_private;
 119         unsigned long irqflags;
 120
 121         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 122
 123         if (HAS_PCH_SPLIT(dev))
 124                 ironlake_enable_display_irq(dev_priv, DE_GSE);
 125         else {
 126                 i915_enable_pipestat(dev_priv, 1,
 127                                      PIPE_LEGACY_BLC_EVENT_ENABLE);
 128                 if (INTEL_INFO(dev)->gen >= 4)
 129                         i915_enable_pipestat(dev_priv, 0,
 130                                              PIPE_LEGACY_BLC_EVENT_ENABLE);
 131         }
 132
 133         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 134 }
 135
 136 /**
 137  * i915_pipe_enabled - check if a pipe is enabled
 138  * @dev: DRM device
 139  * @pipe: pipe to check
 140  *
 141  * Reading certain registers when the pipe is disabled can hang the chip.
 142  * Use this routine to make sure the PLL is running and the pipe is active
 143  * before reading such registers if unsure.
 144  */
 145 static int
 146 i915_pipe_enabled(struct drm_device *dev, int pipe)
 147 {
 148         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 149         return I915_READ(PIPECONF(pipe)) & PIPECONF_ENABLE;
 150 }
 151
 152 /* Called from drm generic code, passed a 'crtc', which
 153  * we use as a pipe index
 154  */
 155 static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 156 {
 157         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 158         unsigned long high_frame;
 159         unsigned long low_frame;
 160         u32 high1, high2, low;
 161
 162         if (!i915_pipe_enabled(dev, pipe)) {
 163                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 164                                 "pipe %c\n", pipe_name(pipe));
 165                 return 0;
 166         }
 167
 168         high_frame = PIPEFRAME(pipe);
 169         low_frame = PIPEFRAMEPIXEL(pipe);
 170
 171         /*
 172          * High & low register fields aren't synchronized, so make sure
 173          * we get a low value that's stable across two reads of the high
 174          * register.
 175          */
 176         do {
 177                 high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 178                 low   = I915_READ(low_frame)  & PIPE_FRAME_LOW_MASK;
 179                 high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 180         } while (high1 != high2);
 181
 182         high1 >>= PIPE_FRAME_HIGH_SHIFT;
 183         low >>= PIPE_FRAME_LOW_SHIFT;
 184         return (high1 << 8) | low;
 185 }
 186
 187 static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 188 {
 189         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 190         int reg = PIPE_FRMCOUNT_GM45(pipe);
 191
 192         if (!i915_pipe_enabled(dev, pipe)) {
 193                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 194                                  "pipe %c\n", pipe_name(pipe));
 195                 return 0;
 196         }
 197
 198         return I915_READ(reg);
 199 }
 200
 201 static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
 202                              int *vpos, int *hpos)
 203 {
 204         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 205         u32 vbl = 0, position = 0;
 206         int vbl_start, vbl_end, htotal, vtotal;
 207         bool in_vbl = true;
 208         int ret = 0;
 209
 210         if (!i915_pipe_enabled(dev, pipe)) {
 211                 DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
 212                                  "pipe %c\n", pipe_name(pipe));
 213                 return 0;
 214         }
 215
 216         /* Get vtotal. */
 217         vtotal = 1 + ((I915_READ(VTOTAL(pipe)) >> 16) & 0x1fff);
 218
 219         if (INTEL_INFO(dev)->gen >= 4) {
 220                 /* No obvious pixelcount register. Only query vertical
 221                  * scanout position from Display scan line register.
 222                  */
 223                 position = I915_READ(PIPEDSL(pipe));
 224
 225                 /* Decode into vertical scanout position. Don't have
 226                  * horizontal scanout position.
 227                  */
 228                 *vpos = position & 0x1fff;
 229                 *hpos = 0;
 230         } else {
 231                 /* Have access to pixelcount since start of frame.
 232                  * We can split this into vertical and horizontal
 233                  * scanout position.
 234                  */
 235                 position = (I915_READ(PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
 236
 237                 htotal = 1 + ((I915_READ(HTOTAL(pipe)) >> 16) & 0x1fff);
 238                 *vpos = position / htotal;
 239                 *hpos = position - (*vpos * htotal);
 240         }
 241
 242         /* Query vblank area. */
 243         vbl = I915_READ(VBLANK(pipe));
 244
 245         /* Test position against vblank region. */
 246         vbl_start = vbl & 0x1fff;
 247         vbl_end = (vbl >> 16) & 0x1fff;
 248
 249         if ((*vpos < vbl_start) || (*vpos > vbl_end))
 250                 in_vbl = false;
 251
 252         /* Inside "upper part" of vblank area? Apply corrective offset: */
 253         if (in_vbl && (*vpos >= vbl_start))
 254                 *vpos = *vpos - vtotal;
 255
 256         /* Readouts valid? */
 257         if (vbl > 0)
 258                 ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
 259
 260         /* In vblank? */
 261         if (in_vbl)
 262                 ret |= DRM_SCANOUTPOS_INVBL;
 263
 264         return ret;
 265 }
 266
 267 static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
 268                               int *max_error,
 269                               struct timeval *vblank_time,
 270                               unsigned flags)
 271 {
 272         struct drm_i915_private *dev_priv = dev->dev_private;
 273         struct drm_crtc *crtc;
 274
 275         if (pipe < 0 || pipe >= dev_priv->num_pipe) {
 276                 DRM_ERROR("Invalid crtc %d\n", pipe);
 277                 return -EINVAL;
 278         }
 279
 280         /* Get drm_crtc to timestamp: */
 281         crtc = intel_get_crtc_for_pipe(dev, pipe);
 282         if (crtc == NULL) {
 283                 DRM_ERROR("Invalid crtc %d\n", pipe);
 284                 return -EINVAL;
 285         }
 286
 287         if (!crtc->enabled) {
 288                 DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
 289                 return -EBUSY;
 290         }
 291
 292         /* Helper routine in DRM core does all the work: */
 293         return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
 294                                                      vblank_time, flags,
 295                                                      crtc);
 296 }
 297
 298 /*
 299  * Handle hotplug events outside the interrupt handler proper.
 300  */
 301 static void i915_hotplug_work_func(struct work_struct *work)
 302 {
 303         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 304                                                     hotplug_work);
 305         struct drm_device *dev = dev_priv->dev;
 306         struct drm_mode_config *mode_config = &dev->mode_config;
 307         struct intel_encoder *encoder;
 308
 309         mutex_lock(&mode_config->mutex);
 310         DRM_DEBUG_KMS("running encoder hotplug functions\n");
 311
 312         list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
 313                 if (encoder->hot_plug)
 314                         encoder->hot_plug(encoder);
 315
 316         mutex_unlock(&mode_config->mutex);
 317
 318         /* Just fire off a uevent and let userspace tell us what to do */
 319         drm_helper_hpd_irq_event(dev);
 320 }
 321
 322 static void i915_handle_rps_change(struct drm_device *dev)
 323 {
 324         drm_i915_private_t *dev_priv = dev->dev_private;
 325         u32 busy_up, busy_down, max_avg, min_avg;
 326         u8 new_delay = dev_priv->cur_delay;
 327
 328         I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
 329         busy_up = I915_READ(RCPREVBSYTUPAVG);
 330         busy_down = I915_READ(RCPREVBSYTDNAVG);
 331         max_avg = I915_READ(RCBMAXAVG);
 332         min_avg = I915_READ(RCBMINAVG);
 333
 334         /* Handle RCS change request from hw */
 335         if (busy_up > max_avg) {
 336                 if (dev_priv->cur_delay != dev_priv->max_delay)
 337                         new_delay = dev_priv->cur_delay - 1;
 338                 if (new_delay < dev_priv->max_delay)
 339                         new_delay = dev_priv->max_delay;
 340         } else if (busy_down < min_avg) {
 341                 if (dev_priv->cur_delay != dev_priv->min_delay)
 342                         new_delay = dev_priv->cur_delay + 1;
 343                 if (new_delay > dev_priv->min_delay)
 344                         new_delay = dev_priv->min_delay;
 345         }
 346
 347         if (ironlake_set_drps(dev, new_delay))
 348                 dev_priv->cur_delay = new_delay;
 349
 350         return;
 351 }
 352
 353 static void notify_ring(struct drm_device *dev,
 354                         struct intel_ring_buffer *ring)
 355 {
 356         struct drm_i915_private *dev_priv = dev->dev_private;
 357         u32 seqno;
 358
 359         if (ring->obj == NULL)
 360                 return;
 361
 362         seqno = ring->get_seqno(ring);
 363         trace_i915_gem_request_complete(ring, seqno);
 364
 365         ring->irq_seqno = seqno;
 366         wake_up_all(&ring->irq_queue);
 367         if (i915_enable_hangcheck) {
 368                 dev_priv->hangcheck_count = 0;
 369                 mod_timer(&dev_priv->hangcheck_timer,
 370                           jiffies +
 371                           msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
 372         }
 373 }
 374
 375 static void gen6_pm_rps_work(struct work_struct *work)
 376 {
 377         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 378                                                     rps_work);
 379         u8 new_delay = dev_priv->cur_delay;
 380         u32 pm_iir, pm_imr;
 381
 382         spin_lock_irq(&dev_priv->rps_lock);
 383         pm_iir = dev_priv->pm_iir;
 384         dev_priv->pm_iir = 0;
 385         pm_imr = I915_READ(GEN6_PMIMR);
 386         I915_WRITE(GEN6_PMIMR, 0);
 387         spin_unlock_irq(&dev_priv->rps_lock);
 388
 389         if (!pm_iir)
 390                 return;
 391
 392         mutex_lock(&dev_priv->dev->struct_mutex);
 393         if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
 394                 if (dev_priv->cur_delay != dev_priv->max_delay)
 395                         new_delay = dev_priv->cur_delay + 1;
 396                 if (new_delay > dev_priv->max_delay)
 397                         new_delay = dev_priv->max_delay;
 398         } else if (pm_iir & (GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT)) {
 399                 gen6_gt_force_wake_get(dev_priv);
 400                 if (dev_priv->cur_delay != dev_priv->min_delay)
 401                         new_delay = dev_priv->cur_delay - 1;
 402                 if (new_delay < dev_priv->min_delay) {
 403                         new_delay = dev_priv->min_delay;
 404                         I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
 405                                    I915_READ(GEN6_RP_INTERRUPT_LIMITS) |
 406                                    ((new_delay << 16) & 0x3f0000));
 407                 } else {
 408                         /* Make sure we continue to get down interrupts
 409                          * until we hit the minimum frequency */
 410                         I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
 411                                    I915_READ(GEN6_RP_INTERRUPT_LIMITS) & ~0x3f0000);
 412                 }
 413                 gen6_gt_force_wake_put(dev_priv);
 414         }
 415
 416         gen6_set_rps(dev_priv->dev, new_delay);
 417         dev_priv->cur_delay = new_delay;
 418
 419         /*
 420          * rps_lock not held here because clearing is non-destructive. There is
 421          * an *extremely* unlikely race with gen6_rps_enable() that is prevented
 422          * by holding struct_mutex for the duration of the write.
 423          */
 424         mutex_unlock(&dev_priv->dev->struct_mutex);
 425 }
 426
 427 static void pch_irq_handler(struct drm_device *dev)
 428 {
 429         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 430         u32 pch_iir;
 431         int pipe;
 432
 433         pch_iir = I915_READ(SDEIIR);
 434
 435         if (pch_iir & SDE_AUDIO_POWER_MASK)
 436                 DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
 437                                  (pch_iir & SDE_AUDIO_POWER_MASK) >>
 438                                  SDE_AUDIO_POWER_SHIFT);
 439
 440         if (pch_iir & SDE_GMBUS)
 441                 DRM_DEBUG_DRIVER("PCH GMBUS interrupt\n");
 442
 443         if (pch_iir & SDE_AUDIO_HDCP_MASK)
 444                 DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
 445
 446         if (pch_iir & SDE_AUDIO_TRANS_MASK)
 447                 DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
 448
 449         if (pch_iir & SDE_POISON)
 450                 DRM_ERROR("PCH poison interrupt\n");
 451
 452         if (pch_iir & SDE_FDI_MASK)
 453                 for_each_pipe(pipe)
 454                         DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
 455                                          pipe_name(pipe),
 456                                          I915_READ(FDI_RX_IIR(pipe)));
 457
 458         if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
 459                 DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
 460
 461         if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
 462                 DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
 463
 464         if (pch_iir & SDE_TRANSB_FIFO_UNDER)
 465                 DRM_DEBUG_DRIVER("PCH transcoder B underrun interrupt\n");
 466         if (pch_iir & SDE_TRANSA_FIFO_UNDER)
 467                 DRM_DEBUG_DRIVER("PCH transcoder A underrun interrupt\n");
 468 }
 469
 470 static irqreturn_t ivybridge_irq_handler(DRM_IRQ_ARGS)
 471 {
 472         struct drm_device *dev = (struct drm_device *) arg;
 473         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 474         int ret = IRQ_NONE;
 475         u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
 476         struct drm_i915_master_private *master_priv;
 477
 478         atomic_inc(&dev_priv->irq_received);
 479
 480         /* disable master interrupt before clearing iir  */
 481         de_ier = I915_READ(DEIER);
 482         I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
 483         POSTING_READ(DEIER);
 484
 485         de_iir = I915_READ(DEIIR);
 486         gt_iir = I915_READ(GTIIR);
 487         pch_iir = I915_READ(SDEIIR);
 488         pm_iir = I915_READ(GEN6_PMIIR);
 489
 490         if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 && pm_iir == 0)
 491                 goto done;
 492
 493         ret = IRQ_HANDLED;
 494
 495         if (dev->primary->master) {
 496                 master_priv = dev->primary->master->driver_priv;
 497                 if (master_priv->sarea_priv)
 498                         master_priv->sarea_priv->last_dispatch =
 499                                 READ_BREADCRUMB(dev_priv);
 500         }
 501
 502         if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))
 503                 notify_ring(dev, &dev_priv->ring[RCS]);
 504         if (gt_iir & GT_GEN6_BSD_USER_INTERRUPT)
 505                 notify_ring(dev, &dev_priv->ring[VCS]);
 506         if (gt_iir & GT_BLT_USER_INTERRUPT)
 507                 notify_ring(dev, &dev_priv->ring[BCS]);
 508
 509         if (de_iir & DE_GSE_IVB)
 510                 intel_opregion_gse_intr(dev);
 511
 512         if (de_iir & DE_PLANEA_FLIP_DONE_IVB) {
 513                 intel_prepare_page_flip(dev, 0);
 514                 intel_finish_page_flip_plane(dev, 0);
 515         }
 516
 517         if (de_iir & DE_PLANEB_FLIP_DONE_IVB) {
 518                 intel_prepare_page_flip(dev, 1);
 519                 intel_finish_page_flip_plane(dev, 1);
 520         }
 521
 522         if (de_iir & DE_PIPEA_VBLANK_IVB)
 523                 drm_handle_vblank(dev, 0);
 524
 525         if (de_iir & DE_PIPEB_VBLANK_IVB)
 526                 drm_handle_vblank(dev, 1);
 527
 528         /* check event from PCH */
 529         if (de_iir & DE_PCH_EVENT_IVB) {
 530                 if (pch_iir & SDE_HOTPLUG_MASK_CPT)
 531                         queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 532                 pch_irq_handler(dev);
 533         }
 534
 535         if (pm_iir & GEN6_PM_DEFERRED_EVENTS) {
 536                 unsigned long flags;
 537                 spin_lock_irqsave(&dev_priv->rps_lock, flags);
 538                 WARN(dev_priv->pm_iir & pm_iir, "Missed a PM interrupt\n");
 539                 dev_priv->pm_iir |= pm_iir;
 540                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_iir);
 541                 POSTING_READ(GEN6_PMIMR);
 542                 spin_unlock_irqrestore(&dev_priv->rps_lock, flags);
 543                 queue_work(dev_priv->wq, &dev_priv->rps_work);
 544         }
 545
 546         /* should clear PCH hotplug event before clear CPU irq */
 547         I915_WRITE(SDEIIR, pch_iir);
 548         I915_WRITE(GTIIR, gt_iir);
 549         I915_WRITE(DEIIR, de_iir);
 550         I915_WRITE(GEN6_PMIIR, pm_iir);
 551
 552 done:
 553         I915_WRITE(DEIER, de_ier);
 554         POSTING_READ(DEIER);
 555
 556         return ret;
 557 }
 558
 559 static irqreturn_t ironlake_irq_handler(DRM_IRQ_ARGS)
 560 {
 561         struct drm_device *dev = (struct drm_device *) arg;
 562         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 563         int ret = IRQ_NONE;
 564         u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
 565         u32 hotplug_mask;
 566         struct drm_i915_master_private *master_priv;
 567         u32 bsd_usr_interrupt = GT_BSD_USER_INTERRUPT;
 568
 569         atomic_inc(&dev_priv->irq_received);
 570
 571         if (IS_GEN6(dev))
 572                 bsd_usr_interrupt = GT_GEN6_BSD_USER_INTERRUPT;
 573
 574         /* disable master interrupt before clearing iir  */
 575         de_ier = I915_READ(DEIER);
 576         I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
 577         POSTING_READ(DEIER);
 578
 579         de_iir = I915_READ(DEIIR);
 580         gt_iir = I915_READ(GTIIR);
 581         pch_iir = I915_READ(SDEIIR);
 582         pm_iir = I915_READ(GEN6_PMIIR);
 583
 584         if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 &&
 585             (!IS_GEN6(dev) || pm_iir == 0))
 586                 goto done;
 587
 588         if (HAS_PCH_CPT(dev))
 589                 hotplug_mask = SDE_HOTPLUG_MASK_CPT;
 590         else
 591                 hotplug_mask = SDE_HOTPLUG_MASK;
 592
 593         ret = IRQ_HANDLED;
 594
 595         if (dev->primary->master) {
 596                 master_priv = dev->primary->master->driver_priv;
 597                 if (master_priv->sarea_priv)
 598                         master_priv->sarea_priv->last_dispatch =
 599                                 READ_BREADCRUMB(dev_priv);
 600         }
 601
 602         if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))
 603                 notify_ring(dev, &dev_priv->ring[RCS]);
 604         if (gt_iir & bsd_usr_interrupt)
 605                 notify_ring(dev, &dev_priv->ring[VCS]);
 606         if (gt_iir & GT_BLT_USER_INTERRUPT)
 607                 notify_ring(dev, &dev_priv->ring[BCS]);
 608
 609         if (de_iir & DE_GSE)
 610                 intel_opregion_gse_intr(dev);
 611
 612         if (de_iir & DE_PLANEA_FLIP_DONE) {
 613                 intel_prepare_page_flip(dev, 0);
 614                 intel_finish_page_flip_plane(dev, 0);
 615         }
 616
 617         if (de_iir & DE_PLANEB_FLIP_DONE) {
 618                 intel_prepare_page_flip(dev, 1);
 619                 intel_finish_page_flip_plane(dev, 1);
 620         }
 621
 622         if (de_iir & DE_PIPEA_VBLANK)
 623                 drm_handle_vblank(dev, 0);
 624
 625         if (de_iir & DE_PIPEB_VBLANK)
 626                 drm_handle_vblank(dev, 1);
 627
 628         /* check event from PCH */
 629         if (de_iir & DE_PCH_EVENT) {
 630                 if (pch_iir & hotplug_mask)
 631                         queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 632                 pch_irq_handler(dev);
 633         }
 634
 635         if (de_iir & DE_PCU_EVENT) {
 636                 I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
 637                 i915_handle_rps_change(dev);
 638         }
 639
 640         if (IS_GEN6(dev) && pm_iir & GEN6_PM_DEFERRED_EVENTS) {
 641                 /*
 642                  * IIR bits should never already be set because IMR should
 643                  * prevent an interrupt from being shown in IIR. The warning
 644                  * displays a case where we've unsafely cleared
 645                  * dev_priv->pm_iir. Although missing an interrupt of the same
 646                  * type is not a problem, it displays a problem in the logic.
 647                  *
 648                  * The mask bit in IMR is cleared by rps_work.
 649                  */
 650                 unsigned long flags;
 651                 spin_lock_irqsave(&dev_priv->rps_lock, flags);
 652                 WARN(dev_priv->pm_iir & pm_iir, "Missed a PM interrupt\n");
 653                 dev_priv->pm_iir |= pm_iir;
 654                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_iir);
 655                 POSTING_READ(GEN6_PMIMR);
 656                 spin_unlock_irqrestore(&dev_priv->rps_lock, flags);
 657                 queue_work(dev_priv->wq, &dev_priv->rps_work);
 658         }
 659
 660         /* should clear PCH hotplug event before clear CPU irq */
 661         I915_WRITE(SDEIIR, pch_iir);
 662         I915_WRITE(GTIIR, gt_iir);
 663         I915_WRITE(DEIIR, de_iir);
 664         I915_WRITE(GEN6_PMIIR, pm_iir);
 665
 666 done:
 667         I915_WRITE(DEIER, de_ier);
 668         POSTING_READ(DEIER);
 669
 670         return ret;
 671 }
 672
 673 /**
 674  * i915_error_work_func - do process context error handling work
 675  * @work: work struct
 676  *
 677  * Fire an error uevent so userspace can see that a hang or error
 678  * was detected.
 679  */
 680 static void i915_error_work_func(struct work_struct *work)
 681 {
 682         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 683                                                     error_work);
 684         struct drm_device *dev = dev_priv->dev;
 685         char *error_event[] = { "ERROR=1", NULL };
 686         char *reset_event[] = { "RESET=1", NULL };
 687         char *reset_done_event[] = { "ERROR=0", NULL };
 688
 689         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, error_event);
 690
 691         if (atomic_read(&dev_priv->mm.wedged)) {
 692                 DRM_DEBUG_DRIVER("resetting chip\n");
 693                 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_event);
 694                 if (!i915_reset(dev, GRDOM_RENDER)) {
 695                         atomic_set(&dev_priv->mm.wedged, 0);
 696                         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_done_event);
 697                 }
 698                 complete_all(&dev_priv->error_completion);
 699         }
 700 }
 701
 702 #ifdef CONFIG_DEBUG_FS
 703 static struct drm_i915_error_object *
 704 i915_error_object_create(struct drm_i915_private *dev_priv,
 705                          struct drm_i915_gem_object *src)
 706 {
 707         struct drm_i915_error_object *dst;
 708         int page, page_count;
 709         u32 reloc_offset;
 710
 711         if (src == NULL || src->pages == NULL)
 712                 return NULL;
 713
 714         page_count = src->base.size / PAGE_SIZE;
 715
 716         dst = kmalloc(sizeof(*dst) + page_count * sizeof(u32 *), GFP_ATOMIC);
 717         if (dst == NULL)
 718                 return NULL;
 719
 720         reloc_offset = src->gtt_offset;
 721         for (page = 0; page < page_count; page++) {
 722                 unsigned long flags;
 723                 void __iomem *s;
 724                 void *d;
 725
 726                 d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
 727                 if (d == NULL)
 728                         goto unwind;
 729
 730                 local_irq_save(flags);
 731                 s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
 732                                              reloc_offset);
 733                 memcpy_fromio(d, s, PAGE_SIZE);
 734                 io_mapping_unmap_atomic(s);
 735                 local_irq_restore(flags);
 736
 737                 dst->pages[page] = d;
 738
 739                 reloc_offset += PAGE_SIZE;
 740         }
 741         dst->page_count = page_count;
 742         dst->gtt_offset = src->gtt_offset;
 743
 744         return dst;
 745
 746 unwind:
 747         while (page--)
 748                 kfree(dst->pages[page]);
 749         kfree(dst);
 750         return NULL;
 751 }
 752
 753 static void
 754 i915_error_object_free(struct drm_i915_error_object *obj)
 755 {
 756         int page;
 757
 758         if (obj == NULL)
 759                 return;
 760
 761         for (page = 0; page < obj->page_count; page++)
 762                 kfree(obj->pages[page]);
 763
 764         kfree(obj);
 765 }
 766
 767 static void
 768 i915_error_state_free(struct drm_device *dev,
 769                       struct drm_i915_error_state *error)
 770 {
 771         int i;
 772
 773         for (i = 0; i < ARRAY_SIZE(error->batchbuffer); i++)
 774                 i915_error_object_free(error->batchbuffer[i]);
 775
 776         for (i = 0; i < ARRAY_SIZE(error->ringbuffer); i++)
 777                 i915_error_object_free(error->ringbuffer[i]);
 778
 779         kfree(error->active_bo);
 780         kfree(error->overlay);
 781         kfree(error);
 782 }
 783
 784 static u32 capture_bo_list(struct drm_i915_error_buffer *err,
 785                            int count,
 786                            struct list_head *head)
 787 {
 788         struct drm_i915_gem_object *obj;
 789         int i = 0;
 790
 791         list_for_each_entry(obj, head, mm_list) {
 792                 err->size = obj->base.size;
 793                 err->name = obj->base.name;
 794                 err->seqno = obj->last_rendering_seqno;
 795                 err->gtt_offset = obj->gtt_offset;
 796                 err->read_domains = obj->base.read_domains;
 797                 err->write_domain = obj->base.write_domain;
 798                 err->fence_reg = obj->fence_reg;
 799                 err->pinned = 0;
 800                 if (obj->pin_count > 0)
 801                         err->pinned = 1;
 802                 if (obj->user_pin_count > 0)
 803                         err->pinned = -1;
 804                 err->tiling = obj->tiling_mode;
 805                 err->dirty = obj->dirty;
 806                 err->purgeable = obj->madv != I915_MADV_WILLNEED;
 807                 err->ring = obj->ring ? obj->ring->id : -1;
 808                 err->cache_level = obj->cache_level;
 809
 810                 if (++i == count)
 811                         break;
 812
 813                 err++;
 814         }
 815
 816         return i;
 817 }
 818
 819 static void i915_gem_record_fences(struct drm_device *dev,
 820                                    struct drm_i915_error_state *error)
 821 {
 822         struct drm_i915_private *dev_priv = dev->dev_private;
 823         int i;
 824
 825         /* Fences */
 826         switch (INTEL_INFO(dev)->gen) {
 827         case 7:
 828         case 6:
 829                 for (i = 0; i < 16; i++)
 830                         error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 + (i * 8));
 831                 break;
 832         case 5:
 833         case 4:
 834                 for (i = 0; i < 16; i++)
 835                         error->fence[i] = I915_READ64(FENCE_REG_965_0 + (i * 8));
 836                 break;
 837         case 3:
 838                 if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
 839                         for (i = 0; i < 8; i++)
 840                                 error->fence[i+8] = I915_READ(FENCE_REG_945_8 + (i * 4));
 841         case 2:
 842                 for (i = 0; i < 8; i++)
 843                         error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
 844                 break;
 845
 846         }
 847 }
 848
 849 static struct drm_i915_error_object *
 850 i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
 851                              struct intel_ring_buffer *ring)
 852 {
 853         struct drm_i915_gem_object *obj;
 854         u32 seqno;
 855
 856         if (!ring->get_seqno)
 857                 return NULL;
 858
 859         seqno = ring->get_seqno(ring);
 860         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
 861                 if (obj->ring != ring)
 862                         continue;
 863
 864                 if (i915_seqno_passed(seqno, obj->last_rendering_seqno))
 865                         continue;
 866
 867                 if ((obj->base.read_domains & I915_GEM_DOMAIN_COMMAND) == 0)
 868                         continue;
 869
 870                 /* We need to copy these to an anonymous buffer as the simplest
 871                  * method to avoid being overwritten by userspace.
 872                  */
 873                 return i915_error_object_create(dev_priv, obj);
 874         }
 875
 876         return NULL;
 877 }
 878
 879 static void i915_record_ring_state(struct drm_device *dev,
 880                                    struct drm_i915_error_state *error,
 881                                    struct intel_ring_buffer *ring)
 882 {
 883         struct drm_i915_private *dev_priv = dev->dev_private;
 884
 885         if (INTEL_INFO(dev)->gen >= 4) {
 886                 error->ipeir[ring->id] = I915_READ(RING_IPEIR(ring->mmio_base));
 887                 error->ipehr[ring->id] = I915_READ(RING_IPEHR(ring->mmio_base));
 888                 error->instdone[ring->id] = I915_READ(RING_INSTDONE(ring->mmio_base));
 889                 if (ring->id == RCS) {
 890                         error->instps = I915_READ(INSTPS);
 891                         error->instdone1 = I915_READ(INSTDONE1);
 892                         error->bbaddr = I915_READ64(BB_ADDR);
 893                 }
 894         } else {
 895                 error->ipeir[ring->id] = I915_READ(IPEIR);
 896                 error->ipehr[ring->id] = I915_READ(IPEHR);
 897                 error->instdone[ring->id] = I915_READ(INSTDONE);
 898                 error->bbaddr = 0;
 899         }
 900
 901         error->seqno[ring->id] = ring->get_seqno(ring);
 902         error->acthd[ring->id] = intel_ring_get_active_head(ring);
 903 }
 904
 905 /**
 906  * i915_capture_error_state - capture an error record for later analysis
 907  * @dev: drm device
 908  *
 909  * Should be called when an error is detected (either a hang or an error
 910  * interrupt) to capture error state from the time of the error.  Fills
 911  * out a structure which becomes available in debugfs for user level tools
 912  * to pick up.
 913  */
 914 static void i915_capture_error_state(struct drm_device *dev)
 915 {
 916         struct drm_i915_private *dev_priv = dev->dev_private;
 917         struct drm_i915_gem_object *obj;
 918         struct drm_i915_error_state *error;
 919         unsigned long flags;
 920         int i, pipe;
 921
 922         spin_lock_irqsave(&dev_priv->error_lock, flags);
 923         error = dev_priv->first_error;
 924         spin_unlock_irqrestore(&dev_priv->error_lock, flags);
 925         if (error)
 926                 return;
 927
 928         /* Account for pipe specific data like PIPE*STAT */
 929         error = kmalloc(sizeof(*error), GFP_ATOMIC);
 930         if (!error) {
 931                 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
 932                 return;
 933         }
 934
 935         DRM_INFO("capturing error event; look for more information in /debug/dri/%d/i915_error_state\n",
 936                  dev->primary->index);
 937
 938         error->eir = I915_READ(EIR);
 939         error->pgtbl_er = I915_READ(PGTBL_ER);
 940         for_each_pipe(pipe)
 941                 error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
 942         error->instpm = I915_READ(INSTPM);
 943
 944         if (INTEL_INFO(dev)->gen >= 6)
 945                 error->error = I915_READ(ERROR_GEN6);
 946         else
 947                 error->error = 0;
 948
 949         i915_record_ring_state(dev, error, &dev_priv->ring[RCS]);
 950         if (HAS_BLT(dev))
 951                 i915_record_ring_state(dev, error, &dev_priv->ring[BCS]);
 952         if (HAS_BSD(dev))
 953                 i915_record_ring_state(dev, error, &dev_priv->ring[VCS]);
 954
 955         i915_gem_record_fences(dev, error);
 956
 957         /* Record the active batch and ring buffers */
 958         for (i = 0; i < I915_NUM_RINGS; i++) {
 959                 error->batchbuffer[i] =
 960                         i915_error_first_batchbuffer(dev_priv,
 961                                                      &dev_priv->ring[i]);
 962
 963                 error->ringbuffer[i] =
 964                         i915_error_object_create(dev_priv,
 965                                                  dev_priv->ring[i].obj);
 966         }
 967
 968         /* Record buffers on the active and pinned lists. */
 969         error->active_bo = NULL;
 970         error->pinned_bo = NULL;
 971
 972         i = 0;
 973         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list)
 974                 i++;
 975         error->active_bo_count = i;
 976         list_for_each_entry(obj, &dev_priv->mm.pinned_list, mm_list)
 977                 i++;
 978         error->pinned_bo_count = i - error->active_bo_count;
 979
 980         error->active_bo = NULL;
 981         error->pinned_bo = NULL;
 982         if (i) {
 983                 error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
 984                                            GFP_ATOMIC);
 985                 if (error->active_bo)
 986                         error->pinned_bo =
 987                                 error->active_bo + error->active_bo_count;
 988         }
 989
 990         if (error->active_bo)
 991                 error->active_bo_count =
 992                         capture_bo_list(error->active_bo,
 993                                         error->active_bo_count,
 994                                         &dev_priv->mm.active_list);
 995
 996         if (error->pinned_bo)
 997                 error->pinned_bo_count =
 998                         capture_bo_list(error->pinned_bo,
 999                                         error->pinned_bo_count,
1000                                         &dev_priv->mm.pinned_list);
1001
1002         do_gettimeofday(&error->time);
1003
1004         error->overlay = intel_overlay_capture_error_state(dev);
1005         error->display = intel_display_capture_error_state(dev);
1006
1007         spin_lock_irqsave(&dev_priv->error_lock, flags);
1008         if (dev_priv->first_error == NULL) {
1009                 dev_priv->first_error = error;
1010                 error = NULL;
1011         }
1012         spin_unlock_irqrestore(&dev_priv->error_lock, flags);
1013
1014         if (error)
1015                 i915_error_state_free(dev, error);
1016 }
1017
1018 void i915_destroy_error_state(struct drm_device *dev)
1019 {
1020         struct drm_i915_private *dev_priv = dev->dev_private;
1021         struct drm_i915_error_state *error;
1022         unsigned long flags;
1023
1024         spin_lock_irqsave(&dev_priv->error_lock, flags);
1025         error = dev_priv->first_error;
1026         dev_priv->first_error = NULL;
1027         spin_unlock_irqrestore(&dev_priv->error_lock, flags);
1028
1029         if (error)
1030                 i915_error_state_free(dev, error);
1031 }
1032 #else
1033 #define i915_capture_error_state(x)
1034 #endif
1035
1036 static void i915_report_and_clear_eir(struct drm_device *dev)
1037 {
1038         struct drm_i915_private *dev_priv = dev->dev_private;
1039         u32 eir = I915_READ(EIR);
1040         int pipe;
1041
1042         if (!eir)
1043                 return;
1044
1045         printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
1046                eir);
1047
1048         if (IS_G4X(dev)) {
1049                 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
1050                         u32 ipeir = I915_READ(IPEIR_I965);
1051
1052                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
1053                                I915_READ(IPEIR_I965));
1054                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
1055                                I915_READ(IPEHR_I965));
1056                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1057                                I915_READ(INSTDONE_I965));
1058                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
1059                                I915_READ(INSTPS));
1060                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
1061                                I915_READ(INSTDONE1));
1062                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
1063                                I915_READ(ACTHD_I965));
1064                         I915_WRITE(IPEIR_I965, ipeir);
1065                         POSTING_READ(IPEIR_I965);
1066                 }
1067                 if (eir & GM45_ERROR_PAGE_TABLE) {
1068                         u32 pgtbl_err = I915_READ(PGTBL_ER);
1069                         printk(KERN_ERR "page table error\n");
1070                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
1071                                pgtbl_err);
1072                         I915_WRITE(PGTBL_ER, pgtbl_err);
1073                         POSTING_READ(PGTBL_ER);
1074                 }
1075         }
1076
1077         if (!IS_GEN2(dev)) {
1078                 if (eir & I915_ERROR_PAGE_TABLE) {
1079                         u32 pgtbl_err = I915_READ(PGTBL_ER);
1080                         printk(KERN_ERR "page table error\n");
1081                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
1082                                pgtbl_err);
1083                         I915_WRITE(PGTBL_ER, pgtbl_err);
1084                         POSTING_READ(PGTBL_ER);
1085                 }
1086         }
1087
1088         if (eir & I915_ERROR_MEMORY_REFRESH) {
1089                 printk(KERN_ERR "memory refresh error:\n");
1090                 for_each_pipe(pipe)
1091                         printk(KERN_ERR "pipe %c stat: 0x%08x\n",
1092                                pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
1093                 /* pipestat has already been acked */
1094         }
1095         if (eir & I915_ERROR_INSTRUCTION) {
1096                 printk(KERN_ERR "instruction error\n");
1097                 printk(KERN_ERR "  INSTPM: 0x%08x\n",
1098                        I915_READ(INSTPM));
1099                 if (INTEL_INFO(dev)->gen < 4) {
1100                         u32 ipeir = I915_READ(IPEIR);
1101
1102                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
1103                                I915_READ(IPEIR));
1104                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
1105                                I915_READ(IPEHR));
1106                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1107                                I915_READ(INSTDONE));
1108                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
1109                                I915_READ(ACTHD));
1110                         I915_WRITE(IPEIR, ipeir);
1111                         POSTING_READ(IPEIR);
1112                 } else {
1113                         u32 ipeir = I915_READ(IPEIR_I965);
1114
1115                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
1116                                I915_READ(IPEIR_I965));
1117                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
1118                                I915_READ(IPEHR_I965));
1119                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1120                                I915_READ(INSTDONE_I965));
1121                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
1122                                I915_READ(INSTPS));
1123                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
1124                                I915_READ(INSTDONE1));
1125                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
1126                                I915_READ(ACTHD_I965));
1127                         I915_WRITE(IPEIR_I965, ipeir);
1128                         POSTING_READ(IPEIR_I965);
1129                 }
1130         }
1131
1132         I915_WRITE(EIR, eir);
1133         POSTING_READ(EIR);
1134         eir = I915_READ(EIR);
1135         if (eir) {
1136                 /*
1137                  * some errors might have become stuck,
1138                  * mask them.
1139                  */
1140                 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
1141                 I915_WRITE(EMR, I915_READ(EMR) | eir);
1142                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
1143         }
1144 }
1145
1146 /**
1147  * i915_handle_error - handle an error interrupt
1148  * @dev: drm device
1149  *
1150  * Do some basic checking of regsiter state at error interrupt time and
1151  * dump it to the syslog.  Also call i915_capture_error_state() to make
1152  * sure we get a record and make it available in debugfs.  Fire a uevent
1153  * so userspace knows something bad happened (should trigger collection
1154  * of a ring dump etc.).
1155  */
1156 void i915_handle_error(struct drm_device *dev, bool wedged)
1157 {
1158         struct drm_i915_private *dev_priv = dev->dev_private;
1159
1160         i915_capture_error_state(dev);
1161         i915_report_and_clear_eir(dev);
1162
1163         if (wedged) {
1164                 INIT_COMPLETION(dev_priv->error_completion);
1165                 atomic_set(&dev_priv->mm.wedged, 1);
1166
1167                 /*
1168                  * Wakeup waiting processes so they don't hang
1169                  */
1170                 wake_up_all(&dev_priv->ring[RCS].irq_queue);
1171                 if (HAS_BSD(dev))
1172                         wake_up_all(&dev_priv->ring[VCS].irq_queue);
1173                 if (HAS_BLT(dev))
1174                         wake_up_all(&dev_priv->ring[BCS].irq_queue);
1175         }
1176
1177         queue_work(dev_priv->wq, &dev_priv->error_work);
1178 }
1179
1180 static void i915_pageflip_stall_check(struct drm_device *dev, int pipe)
1181 {
1182         drm_i915_private_t *dev_priv = dev->dev_private;
1183         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
1184         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
1185         struct drm_i915_gem_object *obj;
1186         struct intel_unpin_work *work;
1187         unsigned long flags;
1188         bool stall_detected;
1189
1190         /* Ignore early vblank irqs */
1191         if (intel_crtc == NULL)
1192                 return;
1193
1194         spin_lock_irqsave(&dev->event_lock, flags);
1195         work = intel_crtc->unpin_work;
1196
1197         if (work == NULL || work->pending || !work->enable_stall_check) {
1198                 /* Either the pending flip IRQ arrived, or we're too early. Don't check */
1199                 spin_unlock_irqrestore(&dev->event_lock, flags);
1200                 return;
1201         }
1202
1203         /* Potential stall - if we see that the flip has happened, assume a missed interrupt */
1204         obj = work->pending_flip_obj;
1205         if (INTEL_INFO(dev)->gen >= 4) {
1206                 int dspsurf = DSPSURF(intel_crtc->plane);
1207                 stall_detected = I915_READ(dspsurf) == obj->gtt_offset;
1208         } else {
1209                 int dspaddr = DSPADDR(intel_crtc->plane);
1210                 stall_detected = I915_READ(dspaddr) == (obj->gtt_offset +
1211                                                         crtc->y * crtc->fb->pitches[0] +
1212                                                         crtc->x * crtc->fb->bits_per_pixel/8);
1213         }
1214
1215         spin_unlock_irqrestore(&dev->event_lock, flags);
1216
1217         if (stall_detected) {
1218                 DRM_DEBUG_DRIVER("Pageflip stall detected\n");
1219                 intel_prepare_page_flip(dev, intel_crtc->plane);
1220         }
1221 }
1222
1223 static irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
1224 {
1225         struct drm_device *dev = (struct drm_device *) arg;
1226         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1227         struct drm_i915_master_private *master_priv;
1228         u32 iir, new_iir;
1229         u32 pipe_stats[I915_MAX_PIPES];
1230         u32 vblank_status;
1231         int vblank = 0;
1232         unsigned long irqflags;
1233         int irq_received;
1234         int ret = IRQ_NONE, pipe;
1235         bool blc_event = false;
1236
1237         atomic_inc(&dev_priv->irq_received);
1238
1239         iir = I915_READ(IIR);
1240
1241         if (INTEL_INFO(dev)->gen >= 4)
1242                 vblank_status = PIPE_START_VBLANK_INTERRUPT_STATUS;
1243         else
1244                 vblank_status = PIPE_VBLANK_INTERRUPT_STATUS;
1245
1246         for (;;) {
1247                 irq_received = iir != 0;
1248
1249                 /* Can't rely on pipestat interrupt bit in iir as it might
1250                  * have been cleared after the pipestat interrupt was received.
1251                  * It doesn't set the bit in iir again, but it still produces
1252                  * interrupts (for non-MSI).
1253                  */
1254                 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1255                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
1256                         i915_handle_error(dev, false);
1257
1258                 for_each_pipe(pipe) {
1259                         int reg = PIPESTAT(pipe);
1260                         pipe_stats[pipe] = I915_READ(reg);
1261
1262                         /*
1263                          * Clear the PIPE*STAT regs before the IIR
1264                          */
1265                         if (pipe_stats[pipe] & 0x8000ffff) {
1266                                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
1267                                         DRM_DEBUG_DRIVER("pipe %c underrun\n",
1268                                                          pipe_name(pipe));
1269                                 I915_WRITE(reg, pipe_stats[pipe]);
1270                                 irq_received = 1;
1271                         }
1272                 }
1273                 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1274
1275                 if (!irq_received)
1276                         break;
1277
1278                 ret = IRQ_HANDLED;
1279
1280                 /* Consume port.  Then clear IIR or we'll miss events */
1281                 if ((I915_HAS_HOTPLUG(dev)) &&
1282                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
1283                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
1284
1285                         DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
1286                                   hotplug_status);
1287                         if (hotplug_status & dev_priv->hotplug_supported_mask)
1288                                 queue_work(dev_priv->wq,
1289                                            &dev_priv->hotplug_work);
1290
1291                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
1292                         I915_READ(PORT_HOTPLUG_STAT);
1293                 }
1294
1295                 I915_WRITE(IIR, iir);
1296                 new_iir = I915_READ(IIR); /* Flush posted writes */
1297
1298                 if (dev->primary->master) {
1299                         master_priv = dev->primary->master->driver_priv;
1300                         if (master_priv->sarea_priv)
1301                                 master_priv->sarea_priv->last_dispatch =
1302                                         READ_BREADCRUMB(dev_priv);
1303                 }
1304
1305                 if (iir & I915_USER_INTERRUPT)
1306                         notify_ring(dev, &dev_priv->ring[RCS]);
1307                 if (iir & I915_BSD_USER_INTERRUPT)
1308                         notify_ring(dev, &dev_priv->ring[VCS]);
1309
1310                 if (iir & I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT) {
1311                         intel_prepare_page_flip(dev, 0);
1312                         if (dev_priv->flip_pending_is_done)
1313                                 intel_finish_page_flip_plane(dev, 0);
1314                 }
1315
1316                 if (iir & I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT) {
1317                         intel_prepare_page_flip(dev, 1);
1318                         if (dev_priv->flip_pending_is_done)
1319                                 intel_finish_page_flip_plane(dev, 1);
1320                 }
1321
1322                 for_each_pipe(pipe) {
1323                         if (pipe_stats[pipe] & vblank_status &&
1324                             drm_handle_vblank(dev, pipe)) {
1325                                 vblank++;
1326                                 if (!dev_priv->flip_pending_is_done) {
1327                                         i915_pageflip_stall_check(dev, pipe);
1328                                         intel_finish_page_flip(dev, pipe);
1329                                 }
1330                         }
1331
1332                         if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
1333                                 blc_event = true;
1334                 }
1335
1336
1337                 if (blc_event || (iir & I915_ASLE_INTERRUPT))
1338                         intel_opregion_asle_intr(dev);
1339
1340                 /* With MSI, interrupts are only generated when iir
1341                  * transitions from zero to nonzero.  If another bit got
1342                  * set while we were handling the existing iir bits, then
1343                  * we would never get another interrupt.
1344                  *
1345                  * This is fine on non-MSI as well, as if we hit this path
1346                  * we avoid exiting the interrupt handler only to generate
1347                  * another one.
1348                  *
1349                  * Note that for MSI this could cause a stray interrupt report
1350                  * if an interrupt landed in the time between writing IIR and
1351                  * the posting read.  This should be rare enough to never
1352                  * trigger the 99% of 100,000 interrupts test for disabling
1353                  * stray interrupts.
1354                  */
1355                 iir = new_iir;
1356         }
1357
1358         return ret;
1359 }
1360
1361 static int i915_emit_irq(struct drm_device * dev)
1362 {
1363         drm_i915_private_t *dev_priv = dev->dev_private;
1364         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
1365
1366         i915_kernel_lost_context(dev);
1367
1368         DRM_DEBUG_DRIVER("\n");
1369
1370         dev_priv->counter++;
1371         if (dev_priv->counter > 0x7FFFFFFFUL)
1372                 dev_priv->counter = 1;
1373         if (master_priv->sarea_priv)
1374                 master_priv->sarea_priv->last_enqueue = dev_priv->counter;
1375
1376         if (BEGIN_LP_RING(4) == 0) {
1377                 OUT_RING(MI_STORE_DWORD_INDEX);
1378                 OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
1379                 OUT_RING(dev_priv->counter);
1380                 OUT_RING(MI_USER_INTERRUPT);
1381                 ADVANCE_LP_RING();
1382         }
1383
1384         return dev_priv->counter;
1385 }
1386
1387 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
1388 {
1389         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1390         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
1391         int ret = 0;
1392         struct intel_ring_buffer *ring = LP_RING(dev_priv);
1393
1394         DRM_DEBUG_DRIVER("irq_nr=%d breadcrumb=%d\n", irq_nr,
1395                   READ_BREADCRUMB(dev_priv));
1396
1397         if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
1398                 if (master_priv->sarea_priv)
1399                         master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
1400                 return 0;
1401         }
1402
1403         if (master_priv->sarea_priv)
1404                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
1405
1406         if (ring->irq_get(ring)) {
1407                 DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,
1408                             READ_BREADCRUMB(dev_priv) >= irq_nr);
1409                 ring->irq_put(ring);
1410         } else if (wait_for(READ_BREADCRUMB(dev_priv) >= irq_nr, 3000))
1411                 ret = -EBUSY;
1412
1413         if (ret == -EBUSY) {
1414                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
1415                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
1416         }
1417
1418         return ret;
1419 }
1420
1421 /* Needs the lock as it touches the ring.
1422  */
1423 int i915_irq_emit(struct drm_device *dev, void *data,
1424                          struct drm_file *file_priv)
1425 {
1426         drm_i915_private_t *dev_priv = dev->dev_private;
1427         drm_i915_irq_emit_t *emit = data;
1428         int result;
1429
1430         if (!dev_priv || !LP_RING(dev_priv)->virtual_start) {
1431                 DRM_ERROR("called with no initialization\n");
1432                 return -EINVAL;
1433         }
1434
1435         RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
1436
1437         mutex_lock(&dev->struct_mutex);
1438         result = i915_emit_irq(dev);
1439         mutex_unlock(&dev->struct_mutex);
1440
1441         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
1442                 DRM_ERROR("copy_to_user\n");
1443                 return -EFAULT;
1444         }
1445
1446         return 0;
1447 }
1448
1449 /* Doesn't need the hardware lock.
1450  */
1451 int i915_irq_wait(struct drm_device *dev, void *data,
1452                          struct drm_file *file_priv)
1453 {
1454         drm_i915_private_t *dev_priv = dev->dev_private;
1455         drm_i915_irq_wait_t *irqwait = data;
1456
1457         if (!dev_priv) {
1458                 DRM_ERROR("called with no initialization\n");
1459                 return -EINVAL;
1460         }
1461
1462         return i915_wait_irq(dev, irqwait->irq_seq);
1463 }
1464
1465 /* Called from drm generic code, passed 'crtc' which
1466  * we use as a pipe index
1467  */
1468 static int i915_enable_vblank(struct drm_device *dev, int pipe)
1469 {
1470         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1471         unsigned long irqflags;
1472
1473         if (!i915_pipe_enabled(dev, pipe))
1474                 return -EINVAL;
1475
1476         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1477         if (INTEL_INFO(dev)->gen >= 4)
1478                 i915_enable_pipestat(dev_priv, pipe,
1479                                      PIPE_START_VBLANK_INTERRUPT_ENABLE);
1480         else
1481                 i915_enable_pipestat(dev_priv, pipe,
1482                                      PIPE_VBLANK_INTERRUPT_ENABLE);
1483
1484         /* maintain vblank delivery even in deep C-states */
1485         if (dev_priv->info->gen == 3)
1486                 I915_WRITE(INSTPM, INSTPM_AGPBUSY_DIS << 16);
1487         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1488
1489         return 0;
1490 }
1491
1492 static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
1493 {
1494         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1495         unsigned long irqflags;
1496
1497         if (!i915_pipe_enabled(dev, pipe))
1498                 return -EINVAL;
1499
1500         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1501         ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
1502                                     DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
1503         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1504
1505         return 0;
1506 }
1507
1508 static int ivybridge_enable_vblank(struct drm_device *dev, int pipe)
1509 {
1510         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1511         unsigned long irqflags;
1512
1513         if (!i915_pipe_enabled(dev, pipe))
1514                 return -EINVAL;
1515
1516         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1517         ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
1518                                     DE_PIPEA_VBLANK_IVB : DE_PIPEB_VBLANK_IVB);
1519         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1520
1521         return 0;
1522 }
1523
1524 /* Called from drm generic code, passed 'crtc' which
1525  * we use as a pipe index
1526  */
1527 static void i915_disable_vblank(struct drm_device *dev, int pipe)
1528 {
1529         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1530         unsigned long irqflags;
1531
1532         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1533         if (dev_priv->info->gen == 3)
1534                 I915_WRITE(INSTPM,
1535                            INSTPM_AGPBUSY_DIS << 16 | INSTPM_AGPBUSY_DIS);
1536
1537         i915_disable_pipestat(dev_priv, pipe,
1538                               PIPE_VBLANK_INTERRUPT_ENABLE |
1539                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
1540         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1541 }
1542
1543 static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
1544 {
1545         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1546         unsigned long irqflags;
1547
1548         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1549         ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
1550                                      DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
1551         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1552 }
1553
1554 static void ivybridge_disable_vblank(struct drm_device *dev, int pipe)
1555 {
1556         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1557         unsigned long irqflags;
1558
1559         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1560         ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
1561                                      DE_PIPEA_VBLANK_IVB : DE_PIPEB_VBLANK_IVB);
1562         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1563 }
1564
1565 /* Set the vblank monitor pipe
1566  */
1567 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
1568                          struct drm_file *file_priv)
1569 {
1570         drm_i915_private_t *dev_priv = dev->dev_private;
1571
1572         if (!dev_priv) {
1573                 DRM_ERROR("called with no initialization\n");
1574                 return -EINVAL;
1575         }
1576
1577         return 0;
1578 }
1579
1580 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
1581                          struct drm_file *file_priv)
1582 {
1583         drm_i915_private_t *dev_priv = dev->dev_private;
1584         drm_i915_vblank_pipe_t *pipe = data;
1585
1586         if (!dev_priv) {
1587                 DRM_ERROR("called with no initialization\n");
1588                 return -EINVAL;
1589         }
1590
1591         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1592
1593         return 0;
1594 }
1595
1596 /**
1597  * Schedule buffer swap at given vertical blank.
1598  */
1599 int i915_vblank_swap(struct drm_device *dev, void *data,
1600                      struct drm_file *file_priv)
1601 {
1602         /* The delayed swap mechanism was fundamentally racy, and has been
1603          * removed.  The model was that the client requested a delayed flip/swap
1604          * from the kernel, then waited for vblank before continuing to perform
1605          * rendering.  The problem was that the kernel might wake the client
1606          * up before it dispatched the vblank swap (since the lock has to be
1607          * held while touching the ringbuffer), in which case the client would
1608          * clear and start the next frame before the swap occurred, and
1609          * flicker would occur in addition to likely missing the vblank.
1610          *
1611          * In the absence of this ioctl, userland falls back to a correct path
1612          * of waiting for a vblank, then dispatching the swap on its own.
1613          * Context switching to userland and back is plenty fast enough for
1614          * meeting the requirements of vblank swapping.
1615          */
1616         return -EINVAL;
1617 }
1618
1619 static u32
1620 ring_last_seqno(struct intel_ring_buffer *ring)
1621 {
1622         return list_entry(ring->request_list.prev,
1623                           struct drm_i915_gem_request, list)->seqno;
1624 }
1625
1626 static bool i915_hangcheck_ring_idle(struct intel_ring_buffer *ring, bool *err)
1627 {
1628         if (list_empty(&ring->request_list) ||
1629             i915_seqno_passed(ring->get_seqno(ring), ring_last_seqno(ring))) {
1630                 /* Issue a wake-up to catch stuck h/w. */
1631                 if (ring->waiting_seqno && waitqueue_active(&ring->irq_queue)) {
1632                         DRM_ERROR("Hangcheck timer elapsed... %s idle [waiting on %d, at %d], missed IRQ?\n",
1633                                   ring->name,
1634                                   ring->waiting_seqno,
1635                                   ring->get_seqno(ring));
1636                         wake_up_all(&ring->irq_queue);
1637                         *err = true;
1638                 }
1639                 return true;
1640         }
1641         return false;
1642 }
1643
1644 static bool kick_ring(struct intel_ring_buffer *ring)
1645 {
1646         struct drm_device *dev = ring->dev;
1647         struct drm_i915_private *dev_priv = dev->dev_private;
1648         u32 tmp = I915_READ_CTL(ring);
1649         if (tmp & RING_WAIT) {
1650                 DRM_ERROR("Kicking stuck wait on %s\n",
1651                           ring->name);
1652                 I915_WRITE_CTL(ring, tmp);
1653                 return true;
1654         }
1655         return false;
1656 }
1657
1658 /**
1659  * This is called when the chip hasn't reported back with completed
1660  * batchbuffers in a long time. The first time this is called we simply record
1661  * ACTHD. If ACTHD hasn't changed by the time the hangcheck timer elapses
1662  * again, we assume the chip is wedged and try to fix it.
1663  */
1664 void i915_hangcheck_elapsed(unsigned long data)
1665 {
1666         struct drm_device *dev = (struct drm_device *)data;
1667         drm_i915_private_t *dev_priv = dev->dev_private;
1668         uint32_t acthd, instdone, instdone1, acthd_bsd, acthd_blt;
1669         bool err = false;
1670
1671         if (!i915_enable_hangcheck)
1672                 return;
1673
1674         /* If all work is done then ACTHD clearly hasn't advanced. */
1675         if (i915_hangcheck_ring_idle(&dev_priv->ring[RCS], &err) &&
1676             i915_hangcheck_ring_idle(&dev_priv->ring[VCS], &err) &&
1677             i915_hangcheck_ring_idle(&dev_priv->ring[BCS], &err)) {
1678                 dev_priv->hangcheck_count = 0;
1679                 if (err)
1680                         goto repeat;
1681                 return;
1682         }
1683
1684         if (INTEL_INFO(dev)->gen < 4) {
1685                 instdone = I915_READ(INSTDONE);
1686                 instdone1 = 0;
1687         } else {
1688                 instdone = I915_READ(INSTDONE_I965);
1689                 instdone1 = I915_READ(INSTDONE1);
1690         }
1691         acthd = intel_ring_get_active_head(&dev_priv->ring[RCS]);
1692         acthd_bsd = HAS_BSD(dev) ?
1693                 intel_ring_get_active_head(&dev_priv->ring[VCS]) : 0;
1694         acthd_blt = HAS_BLT(dev) ?
1695                 intel_ring_get_active_head(&dev_priv->ring[BCS]) : 0;
1696
1697         if (dev_priv->last_acthd == acthd &&
1698             dev_priv->last_acthd_bsd == acthd_bsd &&
1699             dev_priv->last_acthd_blt == acthd_blt &&
1700             dev_priv->last_instdone == instdone &&
1701             dev_priv->last_instdone1 == instdone1) {
1702                 if (dev_priv->hangcheck_count++ > 1) {
1703                         DRM_ERROR("Hangcheck timer elapsed... GPU hung\n");
1704
1705                         if (!IS_GEN2(dev)) {
1706                                 /* Is the chip hanging on a WAIT_FOR_EVENT?
1707                                  * If so we can simply poke the RB_WAIT bit
1708                                  * and break the hang. This should work on
1709                                  * all but the second generation chipsets.
1710                                  */
1711
1712                                 if (kick_ring(&dev_priv->ring[RCS]))
1713                                         goto repeat;
1714
1715                                 if (HAS_BSD(dev) &&
1716                                     kick_ring(&dev_priv->ring[VCS]))
1717                                         goto repeat;
1718
1719                                 if (HAS_BLT(dev) &&
1720                                     kick_ring(&dev_priv->ring[BCS]))
1721                                         goto repeat;
1722                         }
1723
1724                         i915_handle_error(dev, true);
1725                         return;
1726                 }
1727         } else {
1728                 dev_priv->hangcheck_count = 0;
1729
1730                 dev_priv->last_acthd = acthd;
1731                 dev_priv->last_acthd_bsd = acthd_bsd;
1732                 dev_priv->last_acthd_blt = acthd_blt;
1733                 dev_priv->last_instdone = instdone;
1734                 dev_priv->last_instdone1 = instdone1;
1735         }
1736
1737 repeat:
1738         /* Reset timer case chip hangs without another request being added */
1739         mod_timer(&dev_priv->hangcheck_timer,
1740                   jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
1741 }
1742
1743 /* drm_dma.h hooks
1744 */
1745 static void ironlake_irq_preinstall(struct drm_device *dev)
1746 {
1747         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1748
1749         atomic_set(&dev_priv->irq_received, 0);
1750
1751         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
1752         INIT_WORK(&dev_priv->error_work, i915_error_work_func);
1753         if (IS_GEN6(dev) || IS_IVYBRIDGE(dev))
1754                 INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
1755
1756         I915_WRITE(HWSTAM, 0xeffe);
1757         if (IS_GEN6(dev) || IS_GEN7(dev)) {
1758                 /* Workaround stalls observed on Sandy Bridge GPUs by
1759                  * making the blitter command streamer generate a
1760                  * write to the Hardware Status Page for
1761                  * MI_USER_INTERRUPT.  This appears to serialize the
1762                  * previous seqno write out before the interrupt
1763                  * happens.
1764                  */
1765                 I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
1766                 I915_WRITE(GEN6_BSD_HWSTAM, ~GEN6_BSD_USER_INTERRUPT);
1767         }
1768
1769         /* XXX hotplug from PCH */
1770
1771         I915_WRITE(DEIMR, 0xffffffff);
1772         I915_WRITE(DEIER, 0x0);
1773         POSTING_READ(DEIER);
1774
1775         /* and GT */
1776         I915_WRITE(GTIMR, 0xffffffff);
1777         I915_WRITE(GTIER, 0x0);
1778         POSTING_READ(GTIER);
1779
1780         /* south display irq */
1781         I915_WRITE(SDEIMR, 0xffffffff);
1782         I915_WRITE(SDEIER, 0x0);
1783         POSTING_READ(SDEIER);
1784 }
1785
1786 /*
1787  * Enable digital hotplug on the PCH, and configure the DP short pulse
1788  * duration to 2ms (which is the minimum in the Display Port spec)
1789  *
1790  * This register is the same on all known PCH chips.
1791  */
1792
1793 static void ironlake_enable_pch_hotplug(struct drm_device *dev)
1794 {
1795         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1796         u32     hotplug;
1797
1798         hotplug = I915_READ(PCH_PORT_HOTPLUG);
1799         hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
1800         hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
1801         hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
1802         hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
1803         I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
1804 }
1805
1806 static int ironlake_irq_postinstall(struct drm_device *dev)
1807 {
1808         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1809         /* enable kind of interrupts always enabled */
1810         u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
1811                            DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE;
1812         u32 render_irqs;
1813         u32 hotplug_mask;
1814
1815         DRM_INIT_WAITQUEUE(&dev_priv->ring[RCS].irq_queue);
1816         if (HAS_BSD(dev))
1817                 DRM_INIT_WAITQUEUE(&dev_priv->ring[VCS].irq_queue);
1818         if (HAS_BLT(dev))
1819                 DRM_INIT_WAITQUEUE(&dev_priv->ring[BCS].irq_queue);
1820
1821         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1822         dev_priv->irq_mask = ~display_mask;
1823
1824         /* should always can generate irq */
1825         I915_WRITE(DEIIR, I915_READ(DEIIR));
1826         I915_WRITE(DEIMR, dev_priv->irq_mask);
1827         I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK | DE_PIPEB_VBLANK);
1828         POSTING_READ(DEIER);
1829
1830         dev_priv->gt_irq_mask = ~0;
1831
1832         I915_WRITE(GTIIR, I915_READ(GTIIR));
1833         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
1834
1835         if (IS_GEN6(dev))
1836                 render_irqs =
1837                         GT_USER_INTERRUPT |
1838                         GT_GEN6_BSD_USER_INTERRUPT |
1839                         GT_BLT_USER_INTERRUPT;
1840         else
1841                 render_irqs =
1842                         GT_USER_INTERRUPT |
1843                         GT_PIPE_NOTIFY |
1844                         GT_BSD_USER_INTERRUPT;
1845         I915_WRITE(GTIER, render_irqs);
1846         POSTING_READ(GTIER);
1847
1848         if (HAS_PCH_CPT(dev)) {
1849                 hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
1850                                 SDE_PORTB_HOTPLUG_CPT |
1851                                 SDE_PORTC_HOTPLUG_CPT |
1852                                 SDE_PORTD_HOTPLUG_CPT);
1853         } else {
1854                 hotplug_mask = (SDE_CRT_HOTPLUG |
1855                                 SDE_PORTB_HOTPLUG |
1856                                 SDE_PORTC_HOTPLUG |
1857                                 SDE_PORTD_HOTPLUG |
1858                                 SDE_AUX_MASK);
1859         }
1860
1861         dev_priv->pch_irq_mask = ~hotplug_mask;
1862
1863         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
1864         I915_WRITE(SDEIMR, dev_priv->pch_irq_mask);
1865         I915_WRITE(SDEIER, hotplug_mask);
1866         POSTING_READ(SDEIER);
1867
1868         ironlake_enable_pch_hotplug(dev);
1869
1870         if (IS_IRONLAKE_M(dev)) {
1871                 /* Clear & enable PCU event interrupts */
1872                 I915_WRITE(DEIIR, DE_PCU_EVENT);
1873                 I915_WRITE(DEIER, I915_READ(DEIER) | DE_PCU_EVENT);
1874                 ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);
1875         }
1876
1877         return 0;
1878 }
1879
1880 static int ivybridge_irq_postinstall(struct drm_device *dev)
1881 {
1882         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1883         /* enable kind of interrupts always enabled */
1884         u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE_IVB |
1885                 DE_PCH_EVENT_IVB | DE_PLANEA_FLIP_DONE_IVB |
1886                 DE_PLANEB_FLIP_DONE_IVB;
1887         u32 render_irqs;
1888         u32 hotplug_mask;
1889
1890         DRM_INIT_WAITQUEUE(&dev_priv->ring[RCS].irq_queue);
1891         if (HAS_BSD(dev))
1892                 DRM_INIT_WAITQUEUE(&dev_priv->ring[VCS].irq_queue);
1893         if (HAS_BLT(dev))
1894                 DRM_INIT_WAITQUEUE(&dev_priv->ring[BCS].irq_queue);
1895
1896         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1897         dev_priv->irq_mask = ~display_mask;
1898
1899         /* should always can generate irq */
1900         I915_WRITE(DEIIR, I915_READ(DEIIR));
1901         I915_WRITE(DEIMR, dev_priv->irq_mask);
1902         I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK_IVB |
1903                    DE_PIPEB_VBLANK_IVB);
1904         POSTING_READ(DEIER);
1905
1906         dev_priv->gt_irq_mask = ~0;
1907
1908         I915_WRITE(GTIIR, I915_READ(GTIIR));
1909         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
1910
1911         render_irqs = GT_USER_INTERRUPT | GT_GEN6_BSD_USER_INTERRUPT |
1912                 GT_BLT_USER_INTERRUPT;
1913         I915_WRITE(GTIER, render_irqs);
1914         POSTING_READ(GTIER);
1915
1916         hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
1917                         SDE_PORTB_HOTPLUG_CPT |
1918                         SDE_PORTC_HOTPLUG_CPT |
1919                         SDE_PORTD_HOTPLUG_CPT);
1920         dev_priv->pch_irq_mask = ~hotplug_mask;
1921
1922         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
1923         I915_WRITE(SDEIMR, dev_priv->pch_irq_mask);
1924         I915_WRITE(SDEIER, hotplug_mask);
1925         POSTING_READ(SDEIER);
1926
1927         ironlake_enable_pch_hotplug(dev);
1928
1929         return 0;
1930 }
1931
1932 static void i915_driver_irq_preinstall(struct drm_device * dev)
1933 {
1934         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1935         int pipe;
1936
1937         atomic_set(&dev_priv->irq_received, 0);
1938
1939         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
1940         INIT_WORK(&dev_priv->error_work, i915_error_work_func);
1941
1942         if (I915_HAS_HOTPLUG(dev)) {
1943                 I915_WRITE(PORT_HOTPLUG_EN, 0);
1944                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1945         }
1946
1947         I915_WRITE(HWSTAM, 0xeffe);
1948         for_each_pipe(pipe)
1949                 I915_WRITE(PIPESTAT(pipe), 0);
1950         I915_WRITE(IMR, 0xffffffff);
1951         I915_WRITE(IER, 0x0);
1952         POSTING_READ(IER);
1953 }
1954
1955 /*
1956  * Must be called after intel_modeset_init or hotplug interrupts won't be
1957  * enabled correctly.
1958  */
1959 static int i915_driver_irq_postinstall(struct drm_device *dev)
1960 {
1961         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1962         u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
1963         u32 error_mask;
1964
1965         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1966
1967         /* Unmask the interrupts that we always want on. */
1968         dev_priv->irq_mask = ~I915_INTERRUPT_ENABLE_FIX;
1969
1970         dev_priv->pipestat[0] = 0;
1971         dev_priv->pipestat[1] = 0;
1972
1973         if (I915_HAS_HOTPLUG(dev)) {
1974                 /* Enable in IER... */
1975                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
1976                 /* and unmask in IMR */
1977                 dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
1978         }
1979
1980         /*
1981          * Enable some error detection, note the instruction error mask
1982          * bit is reserved, so we leave it masked.
1983          */
1984         if (IS_G4X(dev)) {
1985                 error_mask = ~(GM45_ERROR_PAGE_TABLE |
1986                                GM45_ERROR_MEM_PRIV |
1987                                GM45_ERROR_CP_PRIV |
1988                                I915_ERROR_MEMORY_REFRESH);
1989         } else {
1990                 error_mask = ~(I915_ERROR_PAGE_TABLE |
1991                                I915_ERROR_MEMORY_REFRESH);
1992         }
1993         I915_WRITE(EMR, error_mask);
1994
1995         I915_WRITE(IMR, dev_priv->irq_mask);
1996         I915_WRITE(IER, enable_mask);
1997         POSTING_READ(IER);
1998
1999         if (I915_HAS_HOTPLUG(dev)) {
2000                 u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
2001
2002                 /* Note HDMI and DP share bits */
2003                 if (dev_priv->hotplug_supported_mask & HDMIB_HOTPLUG_INT_STATUS)
2004                         hotplug_en |= HDMIB_HOTPLUG_INT_EN;
2005                 if (dev_priv->hotplug_supported_mask & HDMIC_HOTPLUG_INT_STATUS)
2006                         hotplug_en |= HDMIC_HOTPLUG_INT_EN;
2007                 if (dev_priv->hotplug_supported_mask & HDMID_HOTPLUG_INT_STATUS)
2008                         hotplug_en |= HDMID_HOTPLUG_INT_EN;
2009                 if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS)
2010                         hotplug_en |= SDVOC_HOTPLUG_INT_EN;
2011                 if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS)
2012                         hotplug_en |= SDVOB_HOTPLUG_INT_EN;
2013                 if (dev_priv->hotplug_supported_mask & CRT_HOTPLUG_INT_STATUS) {
2014                         hotplug_en |= CRT_HOTPLUG_INT_EN;
2015
2016                         /* Programming the CRT detection parameters tends
2017                            to generate a spurious hotplug event about three
2018                            seconds later.  So just do it once.
2019                         */
2020                         if (IS_G4X(dev))
2021                                 hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
2022                         hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
2023                 }
2024
2025                 /* Ignore TV since it's buggy */
2026
2027                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
2028         }
2029
2030         intel_opregion_enable_asle(dev);
2031
2032         return 0;
2033 }
2034
2035 static void ironlake_irq_uninstall(struct drm_device *dev)
2036 {
2037         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2038
2039         if (!dev_priv)
2040                 return;
2041
2042         dev_priv->vblank_pipe = 0;
2043
2044         I915_WRITE(HWSTAM, 0xffffffff);
2045
2046         I915_WRITE(DEIMR, 0xffffffff);
2047         I915_WRITE(DEIER, 0x0);
2048         I915_WRITE(DEIIR, I915_READ(DEIIR));
2049
2050         I915_WRITE(GTIMR, 0xffffffff);
2051         I915_WRITE(GTIER, 0x0);
2052         I915_WRITE(GTIIR, I915_READ(GTIIR));
2053
2054         I915_WRITE(SDEIMR, 0xffffffff);
2055         I915_WRITE(SDEIER, 0x0);
2056         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
2057 }
2058
2059 static void i915_driver_irq_uninstall(struct drm_device * dev)
2060 {
2061         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2062         int pipe;
2063
2064         if (!dev_priv)
2065                 return;
2066
2067         dev_priv->vblank_pipe = 0;
2068
2069         if (I915_HAS_HOTPLUG(dev)) {
2070                 I915_WRITE(PORT_HOTPLUG_EN, 0);
2071                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2072         }
2073
2074         I915_WRITE(HWSTAM, 0xffffffff);
2075         for_each_pipe(pipe)
2076                 I915_WRITE(PIPESTAT(pipe), 0);
2077         I915_WRITE(IMR, 0xffffffff);
2078         I915_WRITE(IER, 0x0);
2079
2080         for_each_pipe(pipe)
2081                 I915_WRITE(PIPESTAT(pipe),
2082                            I915_READ(PIPESTAT(pipe)) & 0x8000ffff);
2083         I915_WRITE(IIR, I915_READ(IIR));
2084 }
2085
2086 void intel_irq_init(struct drm_device *dev)
2087 {
2088         dev->driver->get_vblank_counter = i915_get_vblank_counter;
2089         dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
2090         if (IS_G4X(dev) || IS_GEN5(dev) || IS_GEN6(dev) || IS_IVYBRIDGE(dev)) {
2091                 dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
2092                 dev->driver->get_vblank_counter = gm45_get_vblank_counter;
2093         }
2094
2095         if (drm_core_check_feature(dev, DRIVER_MODESET))
2096                 dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
2097         else
2098                 dev->driver->get_vblank_timestamp = NULL;
2099         dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
2100
2101         if (IS_IVYBRIDGE(dev)) {
2102                 /* Share pre & uninstall handlers with ILK/SNB */
2103                 dev->driver->irq_handler = ivybridge_irq_handler;
2104                 dev->driver->irq_preinstall = ironlake_irq_preinstall;
2105                 dev->driver->irq_postinstall = ivybridge_irq_postinstall;
2106                 dev->driver->irq_uninstall = ironlake_irq_uninstall;
2107                 dev->driver->enable_vblank = ivybridge_enable_vblank;
2108                 dev->driver->disable_vblank = ivybridge_disable_vblank;
2109         } else if (HAS_PCH_SPLIT(dev)) {
2110                 dev->driver->irq_handler = ironlake_irq_handler;
2111                 dev->driver->irq_preinstall = ironlake_irq_preinstall;
2112                 dev->driver->irq_postinstall = ironlake_irq_postinstall;
2113                 dev->driver->irq_uninstall = ironlake_irq_uninstall;
2114                 dev->driver->enable_vblank = ironlake_enable_vblank;
2115                 dev->driver->disable_vblank = ironlake_disable_vblank;
2116         } else {
2117                 dev->driver->irq_preinstall = i915_driver_irq_preinstall;
2118                 dev->driver->irq_postinstall = i915_driver_irq_postinstall;
2119                 dev->driver->irq_uninstall = i915_driver_irq_uninstall;
2120                 dev->driver->irq_handler = i915_driver_irq_handler;
2121                 dev->driver->enable_vblank = i915_enable_vblank;
2122                 dev->driver->disable_vblank = i915_disable_vblank;
2123         }
2124 }