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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/sysrq.h>
  32 #include <linux/slab.h>
  33 #include <linux/circ_buf.h>
  34 #include <drm/drmP.h>
  35 #include <drm/i915_drm.h>
  36 #include "i915_drv.h"
  37 #include "i915_trace.h"
  38 #include "intel_drv.h"
  39
  40 static const u32 hpd_ibx[] = {
  41         [HPD_CRT] = SDE_CRT_HOTPLUG,
  42         [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
  43         [HPD_PORT_B] = SDE_PORTB_HOTPLUG,
  44         [HPD_PORT_C] = SDE_PORTC_HOTPLUG,
  45         [HPD_PORT_D] = SDE_PORTD_HOTPLUG
  46 };
  47
  48 static const u32 hpd_cpt[] = {
  49         [HPD_CRT] = SDE_CRT_HOTPLUG_CPT,
  50         [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG_CPT,
  51         [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
  52         [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
  53         [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT
  54 };
  55
  56 static const u32 hpd_mask_i915[] = {
  57         [HPD_CRT] = CRT_HOTPLUG_INT_EN,
  58         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_EN,
  59         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_EN,
  60         [HPD_PORT_B] = PORTB_HOTPLUG_INT_EN,
  61         [HPD_PORT_C] = PORTC_HOTPLUG_INT_EN,
  62         [HPD_PORT_D] = PORTD_HOTPLUG_INT_EN
  63 };
  64
  65 static const u32 hpd_status_g4x[] = {
  66         [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
  67         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_G4X,
  68         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_G4X,
  69         [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
  70         [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
  71         [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
  72 };
  73
  74 static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
  75         [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
  76         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915,
  77         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I915,
  78         [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
  79         [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
  80         [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
  81 };
  82
  83 /* For display hotplug interrupt */
  84 static void
  85 ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask)
  86 {
  87         assert_spin_locked(&dev_priv->irq_lock);
  88
  89         if (dev_priv->pm.irqs_disabled) {
  90                 WARN(1, "IRQs disabled\n");
  91                 dev_priv->pm.regsave.deimr &= ~mask;
  92                 return;
  93         }
  94
  95         if ((dev_priv->irq_mask & mask) != 0) {
  96                 dev_priv->irq_mask &= ~mask;
  97                 I915_WRITE(DEIMR, dev_priv->irq_mask);
  98                 POSTING_READ(DEIMR);
  99         }
 100 }
 101
 102 static void
 103 ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask)
 104 {
 105         assert_spin_locked(&dev_priv->irq_lock);
 106
 107         if (dev_priv->pm.irqs_disabled) {
 108                 WARN(1, "IRQs disabled\n");
 109                 dev_priv->pm.regsave.deimr |= mask;
 110                 return;
 111         }
 112
 113         if ((dev_priv->irq_mask & mask) != mask) {
 114                 dev_priv->irq_mask |= mask;
 115                 I915_WRITE(DEIMR, dev_priv->irq_mask);
 116                 POSTING_READ(DEIMR);
 117         }
 118 }
 119
 120 /**
 121  * ilk_update_gt_irq - update GTIMR
 122  * @dev_priv: driver private
 123  * @interrupt_mask: mask of interrupt bits to update
 124  * @enabled_irq_mask: mask of interrupt bits to enable
 125  */
 126 static void ilk_update_gt_irq(struct drm_i915_private *dev_priv,
 127                               uint32_t interrupt_mask,
 128                               uint32_t enabled_irq_mask)
 129 {
 130         assert_spin_locked(&dev_priv->irq_lock);
 131
 132         if (dev_priv->pm.irqs_disabled) {
 133                 WARN(1, "IRQs disabled\n");
 134                 dev_priv->pm.regsave.gtimr &= ~interrupt_mask;
 135                 dev_priv->pm.regsave.gtimr |= (~enabled_irq_mask &
 136                                                 interrupt_mask);
 137                 return;
 138         }
 139
 140         dev_priv->gt_irq_mask &= ~interrupt_mask;
 141         dev_priv->gt_irq_mask |= (~enabled_irq_mask & interrupt_mask);
 142         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
 143         POSTING_READ(GTIMR);
 144 }
 145
 146 void ilk_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
 147 {
 148         ilk_update_gt_irq(dev_priv, mask, mask);
 149 }
 150
 151 void ilk_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
 152 {
 153         ilk_update_gt_irq(dev_priv, mask, 0);
 154 }
 155
 156 /**
 157   * snb_update_pm_irq - update GEN6_PMIMR
 158   * @dev_priv: driver private
 159   * @interrupt_mask: mask of interrupt bits to update
 160   * @enabled_irq_mask: mask of interrupt bits to enable
 161   */
 162 static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
 163                               uint32_t interrupt_mask,
 164                               uint32_t enabled_irq_mask)
 165 {
 166         uint32_t new_val;
 167
 168         assert_spin_locked(&dev_priv->irq_lock);
 169
 170         if (dev_priv->pm.irqs_disabled) {
 171                 WARN(1, "IRQs disabled\n");
 172                 dev_priv->pm.regsave.gen6_pmimr &= ~interrupt_mask;
 173                 dev_priv->pm.regsave.gen6_pmimr |= (~enabled_irq_mask &
 174                                                      interrupt_mask);
 175                 return;
 176         }
 177
 178         new_val = dev_priv->pm_irq_mask;
 179         new_val &= ~interrupt_mask;
 180         new_val |= (~enabled_irq_mask & interrupt_mask);
 181
 182         if (new_val != dev_priv->pm_irq_mask) {
 183                 dev_priv->pm_irq_mask = new_val;
 184                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_irq_mask);
 185                 POSTING_READ(GEN6_PMIMR);
 186         }
 187 }
 188
 189 void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
 190 {
 191         snb_update_pm_irq(dev_priv, mask, mask);
 192 }
 193
 194 void snb_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
 195 {
 196         snb_update_pm_irq(dev_priv, mask, 0);
 197 }
 198
 199 static bool ivb_can_enable_err_int(struct drm_device *dev)
 200 {
 201         struct drm_i915_private *dev_priv = dev->dev_private;
 202         struct intel_crtc *crtc;
 203         enum pipe pipe;
 204
 205         assert_spin_locked(&dev_priv->irq_lock);
 206
 207         for_each_pipe(pipe) {
 208                 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 209
 210                 if (crtc->cpu_fifo_underrun_disabled)
 211                         return false;
 212         }
 213
 214         return true;
 215 }
 216
 217 static bool cpt_can_enable_serr_int(struct drm_device *dev)
 218 {
 219         struct drm_i915_private *dev_priv = dev->dev_private;
 220         enum pipe pipe;
 221         struct intel_crtc *crtc;
 222
 223         assert_spin_locked(&dev_priv->irq_lock);
 224
 225         for_each_pipe(pipe) {
 226                 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 227
 228                 if (crtc->pch_fifo_underrun_disabled)
 229                         return false;
 230         }
 231
 232         return true;
 233 }
 234
 235 static void i9xx_clear_fifo_underrun(struct drm_device *dev, enum pipe pipe)
 236 {
 237         struct drm_i915_private *dev_priv = dev->dev_private;
 238         u32 reg = PIPESTAT(pipe);
 239         u32 pipestat = I915_READ(reg) & 0x7fff0000;
 240
 241         assert_spin_locked(&dev_priv->irq_lock);
 242
 243         I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
 244         POSTING_READ(reg);
 245 }
 246
 247 static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,
 248                                                  enum pipe pipe, bool enable)
 249 {
 250         struct drm_i915_private *dev_priv = dev->dev_private;
 251         uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :
 252                                           DE_PIPEB_FIFO_UNDERRUN;
 253
 254         if (enable)
 255                 ironlake_enable_display_irq(dev_priv, bit);
 256         else
 257                 ironlake_disable_display_irq(dev_priv, bit);
 258 }
 259
 260 static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
 261                                                   enum pipe pipe, bool enable)
 262 {
 263         struct drm_i915_private *dev_priv = dev->dev_private;
 264         if (enable) {
 265                 I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));
 266
 267                 if (!ivb_can_enable_err_int(dev))
 268                         return;
 269
 270                 ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);
 271         } else {
 272                 bool was_enabled = !(I915_READ(DEIMR) & DE_ERR_INT_IVB);
 273
 274                 /* Change the state _after_ we've read out the current one. */
 275                 ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);
 276
 277                 if (!was_enabled &&
 278                     (I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe))) {
 279                         DRM_DEBUG_KMS("uncleared fifo underrun on pipe %c\n",
 280                                       pipe_name(pipe));
 281                 }
 282         }
 283 }
 284
 285 static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,
 286                                                   enum pipe pipe, bool enable)
 287 {
 288         struct drm_i915_private *dev_priv = dev->dev_private;
 289
 290         assert_spin_locked(&dev_priv->irq_lock);
 291
 292         if (enable)
 293                 dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_FIFO_UNDERRUN;
 294         else
 295                 dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_FIFO_UNDERRUN;
 296         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
 297         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
 298 }
 299
 300 /**
 301  * ibx_display_interrupt_update - update SDEIMR
 302  * @dev_priv: driver private
 303  * @interrupt_mask: mask of interrupt bits to update
 304  * @enabled_irq_mask: mask of interrupt bits to enable
 305  */
 306 static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
 307                                          uint32_t interrupt_mask,
 308                                          uint32_t enabled_irq_mask)
 309 {
 310         uint32_t sdeimr = I915_READ(SDEIMR);
 311         sdeimr &= ~interrupt_mask;
 312         sdeimr |= (~enabled_irq_mask & interrupt_mask);
 313
 314         assert_spin_locked(&dev_priv->irq_lock);
 315
 316         if (dev_priv->pm.irqs_disabled &&
 317             (interrupt_mask & SDE_HOTPLUG_MASK_CPT)) {
 318                 WARN(1, "IRQs disabled\n");
 319                 dev_priv->pm.regsave.sdeimr &= ~interrupt_mask;
 320                 dev_priv->pm.regsave.sdeimr |= (~enabled_irq_mask &
 321                                                  interrupt_mask);
 322                 return;
 323         }
 324
 325         I915_WRITE(SDEIMR, sdeimr);
 326         POSTING_READ(SDEIMR);
 327 }
 328 #define ibx_enable_display_interrupt(dev_priv, bits) \
 329         ibx_display_interrupt_update((dev_priv), (bits), (bits))
 330 #define ibx_disable_display_interrupt(dev_priv, bits) \
 331         ibx_display_interrupt_update((dev_priv), (bits), 0)
 332
 333 static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
 334                                             enum transcoder pch_transcoder,
 335                                             bool enable)
 336 {
 337         struct drm_i915_private *dev_priv = dev->dev_private;
 338         uint32_t bit = (pch_transcoder == TRANSCODER_A) ?
 339                        SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;
 340
 341         if (enable)
 342                 ibx_enable_display_interrupt(dev_priv, bit);
 343         else
 344                 ibx_disable_display_interrupt(dev_priv, bit);
 345 }
 346
 347 static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
 348                                             enum transcoder pch_transcoder,
 349                                             bool enable)
 350 {
 351         struct drm_i915_private *dev_priv = dev->dev_private;
 352
 353         if (enable) {
 354                 I915_WRITE(SERR_INT,
 355                            SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));
 356
 357                 if (!cpt_can_enable_serr_int(dev))
 358                         return;
 359
 360                 ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);
 361         } else {
 362                 uint32_t tmp = I915_READ(SERR_INT);
 363                 bool was_enabled = !(I915_READ(SDEIMR) & SDE_ERROR_CPT);
 364
 365                 /* Change the state _after_ we've read out the current one. */
 366                 ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);
 367
 368                 if (!was_enabled &&
 369                     (tmp & SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder))) {
 370                         DRM_DEBUG_KMS("uncleared pch fifo underrun on pch transcoder %c\n",
 371                                       transcoder_name(pch_transcoder));
 372                 }
 373         }
 374 }
 375
 376 /**
 377  * intel_set_cpu_fifo_underrun_reporting - enable/disable FIFO underrun messages
 378  * @dev: drm device
 379  * @pipe: pipe
 380  * @enable: true if we want to report FIFO underrun errors, false otherwise
 381  *
 382  * This function makes us disable or enable CPU fifo underruns for a specific
 383  * pipe. Notice that on some Gens (e.g. IVB, HSW), disabling FIFO underrun
 384  * reporting for one pipe may also disable all the other CPU error interruts for
 385  * the other pipes, due to the fact that there's just one interrupt mask/enable
 386  * bit for all the pipes.
 387  *
 388  * Returns the previous state of underrun reporting.
 389  */
 390 bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
 391                                              enum pipe pipe, bool enable)
 392 {
 393         struct drm_i915_private *dev_priv = dev->dev_private;
 394         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 395         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 396         bool ret;
 397
 398         assert_spin_locked(&dev_priv->irq_lock);
 399
 400         ret = !intel_crtc->cpu_fifo_underrun_disabled;
 401
 402         if (enable == ret)
 403                 goto done;
 404
 405         intel_crtc->cpu_fifo_underrun_disabled = !enable;
 406
 407         if (enable && (INTEL_INFO(dev)->gen < 5 || IS_VALLEYVIEW(dev)))
 408                 i9xx_clear_fifo_underrun(dev, pipe);
 409         else if (IS_GEN5(dev) || IS_GEN6(dev))
 410                 ironlake_set_fifo_underrun_reporting(dev, pipe, enable);
 411         else if (IS_GEN7(dev))
 412                 ivybridge_set_fifo_underrun_reporting(dev, pipe, enable);
 413         else if (IS_GEN8(dev))
 414                 broadwell_set_fifo_underrun_reporting(dev, pipe, enable);
 415
 416 done:
 417         return ret;
 418 }
 419
 420 bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
 421                                            enum pipe pipe, bool enable)
 422 {
 423         struct drm_i915_private *dev_priv = dev->dev_private;
 424         unsigned long flags;
 425         bool ret;
 426
 427         spin_lock_irqsave(&dev_priv->irq_lock, flags);
 428         ret = __intel_set_cpu_fifo_underrun_reporting(dev, pipe, enable);
 429         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 430
 431         return ret;
 432 }
 433
 434 static bool __cpu_fifo_underrun_reporting_enabled(struct drm_device *dev,
 435                                                   enum pipe pipe)
 436 {
 437         struct drm_i915_private *dev_priv = dev->dev_private;
 438         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 439         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 440
 441         return !intel_crtc->cpu_fifo_underrun_disabled;
 442 }
 443
 444 /**
 445  * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages
 446  * @dev: drm device
 447  * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)
 448  * @enable: true if we want to report FIFO underrun errors, false otherwise
 449  *
 450  * This function makes us disable or enable PCH fifo underruns for a specific
 451  * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO
 452  * underrun reporting for one transcoder may also disable all the other PCH
 453  * error interruts for the other transcoders, due to the fact that there's just
 454  * one interrupt mask/enable bit for all the transcoders.
 455  *
 456  * Returns the previous state of underrun reporting.
 457  */
 458 bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,
 459                                            enum transcoder pch_transcoder,
 460                                            bool enable)
 461 {
 462         struct drm_i915_private *dev_priv = dev->dev_private;
 463         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];
 464         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 465         unsigned long flags;
 466         bool ret;
 467
 468         /*
 469          * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT
 470          * has only one pch transcoder A that all pipes can use. To avoid racy
 471          * pch transcoder -> pipe lookups from interrupt code simply store the
 472          * underrun statistics in crtc A. Since we never expose this anywhere
 473          * nor use it outside of the fifo underrun code here using the "wrong"
 474          * crtc on LPT won't cause issues.
 475          */
 476
 477         spin_lock_irqsave(&dev_priv->irq_lock, flags);
 478
 479         ret = !intel_crtc->pch_fifo_underrun_disabled;
 480
 481         if (enable == ret)
 482                 goto done;
 483
 484         intel_crtc->pch_fifo_underrun_disabled = !enable;
 485
 486         if (HAS_PCH_IBX(dev))
 487                 ibx_set_fifo_underrun_reporting(dev, pch_transcoder, enable);
 488         else
 489                 cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable);
 490
 491 done:
 492         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 493         return ret;
 494 }
 495
 496
 497 static void
 498 __i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 499                        u32 enable_mask, u32 status_mask)
 500 {
 501         u32 reg = PIPESTAT(pipe);
 502         u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK;
 503
 504         assert_spin_locked(&dev_priv->irq_lock);
 505
 506         if (WARN_ON_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
 507                          status_mask & ~PIPESTAT_INT_STATUS_MASK))
 508                 return;
 509
 510         if ((pipestat & enable_mask) == enable_mask)
 511                 return;
 512
 513         dev_priv->pipestat_irq_mask[pipe] |= status_mask;
 514
 515         /* Enable the interrupt, clear any pending status */
 516         pipestat |= enable_mask | status_mask;
 517         I915_WRITE(reg, pipestat);
 518         POSTING_READ(reg);
 519 }
 520
 521 static void
 522 __i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 523                         u32 enable_mask, u32 status_mask)
 524 {
 525         u32 reg = PIPESTAT(pipe);
 526         u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK;
 527
 528         assert_spin_locked(&dev_priv->irq_lock);
 529
 530         if (WARN_ON_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
 531                          status_mask & ~PIPESTAT_INT_STATUS_MASK))
 532                 return;
 533
 534         if ((pipestat & enable_mask) == 0)
 535                 return;
 536
 537         dev_priv->pipestat_irq_mask[pipe] &= ~status_mask;
 538
 539         pipestat &= ~enable_mask;
 540         I915_WRITE(reg, pipestat);
 541         POSTING_READ(reg);
 542 }
 543
 544 static u32 vlv_get_pipestat_enable_mask(struct drm_device *dev, u32 status_mask)
 545 {
 546         u32 enable_mask = status_mask << 16;
 547
 548         /*
 549          * On pipe A we don't support the PSR interrupt yet, on pipe B the
 550          * same bit MBZ.
 551          */
 552         if (WARN_ON_ONCE(status_mask & PIPE_A_PSR_STATUS_VLV))
 553                 return 0;
 554
 555         enable_mask &= ~(PIPE_FIFO_UNDERRUN_STATUS |
 556                          SPRITE0_FLIP_DONE_INT_EN_VLV |
 557                          SPRITE1_FLIP_DONE_INT_EN_VLV);
 558         if (status_mask & SPRITE0_FLIP_DONE_INT_STATUS_VLV)
 559                 enable_mask |= SPRITE0_FLIP_DONE_INT_EN_VLV;
 560         if (status_mask & SPRITE1_FLIP_DONE_INT_STATUS_VLV)
 561                 enable_mask |= SPRITE1_FLIP_DONE_INT_EN_VLV;
 562
 563         return enable_mask;
 564 }
 565
 566 void
 567 i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 568                      u32 status_mask)
 569 {
 570         u32 enable_mask;
 571
 572         if (IS_VALLEYVIEW(dev_priv->dev))
 573                 enable_mask = vlv_get_pipestat_enable_mask(dev_priv->dev,
 574                                                            status_mask);
 575         else
 576                 enable_mask = status_mask << 16;
 577         __i915_enable_pipestat(dev_priv, pipe, enable_mask, status_mask);
 578 }
 579
 580 void
 581 i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 582                       u32 status_mask)
 583 {
 584         u32 enable_mask;
 585
 586         if (IS_VALLEYVIEW(dev_priv->dev))
 587                 enable_mask = vlv_get_pipestat_enable_mask(dev_priv->dev,
 588                                                            status_mask);
 589         else
 590                 enable_mask = status_mask << 16;
 591         __i915_disable_pipestat(dev_priv, pipe, enable_mask, status_mask);
 592 }
 593
 594 /**
 595  * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion
 596  */
 597 static void i915_enable_asle_pipestat(struct drm_device *dev)
 598 {
 599         struct drm_i915_private *dev_priv = dev->dev_private;
 600         unsigned long irqflags;
 601
 602         if (!dev_priv->opregion.asle || !IS_MOBILE(dev))
 603                 return;
 604
 605         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 606
 607         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_LEGACY_BLC_EVENT_STATUS);
 608         if (INTEL_INFO(dev)->gen >= 4)
 609                 i915_enable_pipestat(dev_priv, PIPE_A,
 610                                      PIPE_LEGACY_BLC_EVENT_STATUS);
 611
 612         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 613 }
 614
 615 /**
 616  * i915_pipe_enabled - check if a pipe is enabled
 617  * @dev: DRM device
 618  * @pipe: pipe to check
 619  *
 620  * Reading certain registers when the pipe is disabled can hang the chip.
 621  * Use this routine to make sure the PLL is running and the pipe is active
 622  * before reading such registers if unsure.
 623  */
 624 static int
 625 i915_pipe_enabled(struct drm_device *dev, int pipe)
 626 {
 627         struct drm_i915_private *dev_priv = dev->dev_private;
 628
 629         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 630                 /* Locking is horribly broken here, but whatever. */
 631                 struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 632                 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 633
 634                 return intel_crtc->active;
 635         } else {
 636                 return I915_READ(PIPECONF(pipe)) & PIPECONF_ENABLE;
 637         }
 638 }
 639
 640 static u32 i8xx_get_vblank_counter(struct drm_device *dev, int pipe)
 641 {
 642         /* Gen2 doesn't have a hardware frame counter */
 643         return 0;
 644 }
 645
 646 /* Called from drm generic code, passed a 'crtc', which
 647  * we use as a pipe index
 648  */
 649 static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 650 {
 651         struct drm_i915_private *dev_priv = dev->dev_private;
 652         unsigned long high_frame;
 653         unsigned long low_frame;
 654         u32 high1, high2, low, pixel, vbl_start;
 655
 656         if (!i915_pipe_enabled(dev, pipe)) {
 657                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 658                                 "pipe %c\n", pipe_name(pipe));
 659                 return 0;
 660         }
 661
 662         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 663                 struct intel_crtc *intel_crtc =
 664                         to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 665                 const struct drm_display_mode *mode =
 666                         &intel_crtc->config.adjusted_mode;
 667
 668                 vbl_start = mode->crtc_vblank_start * mode->crtc_htotal;
 669         } else {
 670                 enum transcoder cpu_transcoder = (enum transcoder) pipe;
 671                 u32 htotal;
 672
 673                 htotal = ((I915_READ(HTOTAL(cpu_transcoder)) >> 16) & 0x1fff) + 1;
 674                 vbl_start = (I915_READ(VBLANK(cpu_transcoder)) & 0x1fff) + 1;
 675
 676                 vbl_start *= htotal;
 677         }
 678
 679         high_frame = PIPEFRAME(pipe);
 680         low_frame = PIPEFRAMEPIXEL(pipe);
 681
 682         /*
 683          * High & low register fields aren't synchronized, so make sure
 684          * we get a low value that's stable across two reads of the high
 685          * register.
 686          */
 687         do {
 688                 high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 689                 low   = I915_READ(low_frame);
 690                 high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 691         } while (high1 != high2);
 692
 693         high1 >>= PIPE_FRAME_HIGH_SHIFT;
 694         pixel = low & PIPE_PIXEL_MASK;
 695         low >>= PIPE_FRAME_LOW_SHIFT;
 696
 697         /*
 698          * The frame counter increments at beginning of active.
 699          * Cook up a vblank counter by also checking the pixel
 700          * counter against vblank start.
 701          */
 702         return (((high1 << 8) | low) + (pixel >= vbl_start)) & 0xffffff;
 703 }
 704
 705 static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 706 {
 707         struct drm_i915_private *dev_priv = dev->dev_private;
 708         int reg = PIPE_FRMCOUNT_GM45(pipe);
 709
 710         if (!i915_pipe_enabled(dev, pipe)) {
 711                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 712                                  "pipe %c\n", pipe_name(pipe));
 713                 return 0;
 714         }
 715
 716         return I915_READ(reg);
 717 }
 718
 719 /* raw reads, only for fast reads of display block, no need for forcewake etc. */
 720 #define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__))
 721
 722 static bool ilk_pipe_in_vblank_locked(struct drm_device *dev, enum pipe pipe)
 723 {
 724         struct drm_i915_private *dev_priv = dev->dev_private;
 725         uint32_t status;
 726         int reg;
 727
 728         if (INTEL_INFO(dev)->gen >= 8) {
 729                 status = GEN8_PIPE_VBLANK;
 730                 reg = GEN8_DE_PIPE_ISR(pipe);
 731         } else if (INTEL_INFO(dev)->gen >= 7) {
 732                 status = DE_PIPE_VBLANK_IVB(pipe);
 733                 reg = DEISR;
 734         } else {
 735                 status = DE_PIPE_VBLANK(pipe);
 736                 reg = DEISR;
 737         }
 738
 739         return __raw_i915_read32(dev_priv, reg) & status;
 740 }
 741
 742 static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
 743                                     unsigned int flags, int *vpos, int *hpos,
 744                                     ktime_t *stime, ktime_t *etime)
 745 {
 746         struct drm_i915_private *dev_priv = dev->dev_private;
 747         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 748         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 749         const struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode;
 750         int position;
 751         int vbl_start, vbl_end, htotal, vtotal;
 752         bool in_vbl = true;
 753         int ret = 0;
 754         unsigned long irqflags;
 755
 756         if (!intel_crtc->active) {
 757                 DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
 758                                  "pipe %c\n", pipe_name(pipe));
 759                 return 0;
 760         }
 761
 762         htotal = mode->crtc_htotal;
 763         vtotal = mode->crtc_vtotal;
 764         vbl_start = mode->crtc_vblank_start;
 765         vbl_end = mode->crtc_vblank_end;
 766
 767         if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
 768                 vbl_start = DIV_ROUND_UP(vbl_start, 2);
 769                 vbl_end /= 2;
 770                 vtotal /= 2;
 771         }
 772
 773         ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
 774
 775         /*
 776          * Lock uncore.lock, as we will do multiple timing critical raw
 777          * register reads, potentially with preemption disabled, so the
 778          * following code must not block on uncore.lock.
 779          */
 780         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 781
 782         /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
 783
 784         /* Get optional system timestamp before query. */
 785         if (stime)
 786                 *stime = ktime_get();
 787
 788         if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
 789                 /* No obvious pixelcount register. Only query vertical
 790                  * scanout position from Display scan line register.
 791                  */
 792                 if (IS_GEN2(dev))
 793                         position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN2;
 794                 else
 795                         position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;
 796
 797                 if (HAS_DDI(dev)) {
 798                         /*
 799                          * On HSW HDMI outputs there seems to be a 2 line
 800                          * difference, whereas eDP has the normal 1 line
 801                          * difference that earlier platforms have. External
 802                          * DP is unknown. For now just check for the 2 line
 803                          * difference case on all output types on HSW+.
 804                          *
 805                          * This might misinterpret the scanline counter being
 806                          * one line too far along on eDP, but that's less
 807                          * dangerous than the alternative since that would lead
 808                          * the vblank timestamp code astray when it sees a
 809                          * scanline count before vblank_start during a vblank
 810                          * interrupt.
 811                          */
 812                         in_vbl = ilk_pipe_in_vblank_locked(dev, pipe);
 813                         if ((in_vbl && (position == vbl_start - 2 ||
 814                                         position == vbl_start - 1)) ||
 815                             (!in_vbl && (position == vbl_end - 2 ||
 816                                          position == vbl_end - 1)))
 817                                 position = (position + 2) % vtotal;
 818                 } else if (HAS_PCH_SPLIT(dev)) {
 819                         /*
 820                          * The scanline counter increments at the leading edge
 821                          * of hsync, ie. it completely misses the active portion
 822                          * of the line. Fix up the counter at both edges of vblank
 823                          * to get a more accurate picture whether we're in vblank
 824                          * or not.
 825                          */
 826                         in_vbl = ilk_pipe_in_vblank_locked(dev, pipe);
 827                         if ((in_vbl && position == vbl_start - 1) ||
 828                             (!in_vbl && position == vbl_end - 1))
 829                                 position = (position + 1) % vtotal;
 830                 } else {
 831                         /*
 832                          * ISR vblank status bits don't work the way we'd want
 833                          * them to work on non-PCH platforms (for
 834                          * ilk_pipe_in_vblank_locked()), and there doesn't
 835                          * appear any other way to determine if we're currently
 836                          * in vblank.
 837                          *
 838                          * Instead let's assume that we're already in vblank if
 839                          * we got called from the vblank interrupt and the
 840                          * scanline counter value indicates that we're on the
 841                          * line just prior to vblank start. This should result
 842                          * in the correct answer, unless the vblank interrupt
 843                          * delivery really got delayed for almost exactly one
 844                          * full frame/field.
 845                          */
 846                         if (flags & DRM_CALLED_FROM_VBLIRQ &&
 847                             position == vbl_start - 1) {
 848                                 position = (position + 1) % vtotal;
 849
 850                                 /* Signal this correction as "applied". */
 851                                 ret |= 0x8;
 852                         }
 853                 }
 854         } else {
 855                 /* Have access to pixelcount since start of frame.
 856                  * We can split this into vertical and horizontal
 857                  * scanout position.
 858                  */
 859                 position = (__raw_i915_read32(dev_priv, PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
 860
 861                 /* convert to pixel counts */
 862                 vbl_start *= htotal;
 863                 vbl_end *= htotal;
 864                 vtotal *= htotal;
 865         }
 866
 867         /* Get optional system timestamp after query. */
 868         if (etime)
 869                 *etime = ktime_get();
 870
 871         /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
 872
 873         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 874
 875         in_vbl = position >= vbl_start && position < vbl_end;
 876
 877         /*
 878          * While in vblank, position will be negative
 879          * counting up towards 0 at vbl_end. And outside
 880          * vblank, position will be positive counting
 881          * up since vbl_end.
 882          */
 883         if (position >= vbl_start)
 884                 position -= vbl_end;
 885         else
 886                 position += vtotal - vbl_end;
 887
 888         if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
 889                 *vpos = position;
 890                 *hpos = 0;
 891         } else {
 892                 *vpos = position / htotal;
 893                 *hpos = position - (*vpos * htotal);
 894         }
 895
 896         /* In vblank? */
 897         if (in_vbl)
 898                 ret |= DRM_SCANOUTPOS_INVBL;
 899
 900         return ret;
 901 }
 902
 903 static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
 904                               int *max_error,
 905                               struct timeval *vblank_time,
 906                               unsigned flags)
 907 {
 908         struct drm_crtc *crtc;
 909
 910         if (pipe < 0 || pipe >= INTEL_INFO(dev)->num_pipes) {
 911                 DRM_ERROR("Invalid crtc %d\n", pipe);
 912                 return -EINVAL;
 913         }
 914
 915         /* Get drm_crtc to timestamp: */
 916         crtc = intel_get_crtc_for_pipe(dev, pipe);
 917         if (crtc == NULL) {
 918                 DRM_ERROR("Invalid crtc %d\n", pipe);
 919                 return -EINVAL;
 920         }
 921
 922         if (!crtc->enabled) {
 923                 DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
 924                 return -EBUSY;
 925         }
 926
 927         /* Helper routine in DRM core does all the work: */
 928         return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
 929                                                      vblank_time, flags,
 930                                                      crtc,
 931                                                      &to_intel_crtc(crtc)->config.adjusted_mode);
 932 }
 933
 934 static bool intel_hpd_irq_event(struct drm_device *dev,
 935                                 struct drm_connector *connector)
 936 {
 937         enum drm_connector_status old_status;
 938
 939         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
 940         old_status = connector->status;
 941
 942         connector->status = connector->funcs->detect(connector, false);
 943         if (old_status == connector->status)
 944                 return false;
 945
 946         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
 947                       connector->base.id,
 948                       drm_get_connector_name(connector),
 949                       drm_get_connector_status_name(old_status),
 950                       drm_get_connector_status_name(connector->status));
 951
 952         return true;
 953 }
 954
 955 /*
 956  * Handle hotplug events outside the interrupt handler proper.
 957  */
 958 #define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
 959
 960 static void i915_hotplug_work_func(struct work_struct *work)
 961 {
 962         struct drm_i915_private *dev_priv =
 963                 container_of(work, struct drm_i915_private, hotplug_work);
 964         struct drm_device *dev = dev_priv->dev;
 965         struct drm_mode_config *mode_config = &dev->mode_config;
 966         struct intel_connector *intel_connector;
 967         struct intel_encoder *intel_encoder;
 968         struct drm_connector *connector;
 969         unsigned long irqflags;
 970         bool hpd_disabled = false;
 971         bool changed = false;
 972         u32 hpd_event_bits;
 973
 974         /* HPD irq before everything is fully set up. */
 975         if (!dev_priv->enable_hotplug_processing)
 976                 return;
 977
 978         mutex_lock(&mode_config->mutex);
 979         DRM_DEBUG_KMS("running encoder hotplug functions\n");
 980
 981         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 982
 983         hpd_event_bits = dev_priv->hpd_event_bits;
 984         dev_priv->hpd_event_bits = 0;
 985         list_for_each_entry(connector, &mode_config->connector_list, head) {
 986                 intel_connector = to_intel_connector(connector);
 987                 intel_encoder = intel_connector->encoder;
 988                 if (intel_encoder->hpd_pin > HPD_NONE &&
 989                     dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED &&
 990                     connector->polled == DRM_CONNECTOR_POLL_HPD) {
 991                         DRM_INFO("HPD interrupt storm detected on connector %s: "
 992                                  "switching from hotplug detection to polling\n",
 993                                 drm_get_connector_name(connector));
 994                         dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark = HPD_DISABLED;
 995                         connector->polled = DRM_CONNECTOR_POLL_CONNECT
 996                                 | DRM_CONNECTOR_POLL_DISCONNECT;
 997                         hpd_disabled = true;
 998                 }
 999                 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
1000                         DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
1001                                       drm_get_connector_name(connector), intel_encoder->hpd_pin);
1002                 }
1003         }
1004          /* if there were no outputs to poll, poll was disabled,
1005           * therefore make sure it's enabled when disabling HPD on
1006           * some connectors */
1007         if (hpd_disabled) {
1008                 drm_kms_helper_poll_enable(dev);
1009                 mod_timer(&dev_priv->hotplug_reenable_timer,
1010                           jiffies + msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
1011         }
1012
1013         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1014
1015         list_for_each_entry(connector, &mode_config->connector_list, head) {
1016                 intel_connector = to_intel_connector(connector);
1017                 intel_encoder = intel_connector->encoder;
1018                 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
1019                         if (intel_encoder->hot_plug)
1020                                 intel_encoder->hot_plug(intel_encoder);
1021                         if (intel_hpd_irq_event(dev, connector))
1022                                 changed = true;
1023                 }
1024         }
1025         mutex_unlock(&mode_config->mutex);
1026
1027         if (changed)
1028                 drm_kms_helper_hotplug_event(dev);
1029 }
1030
1031 static void intel_hpd_irq_uninstall(struct drm_i915_private *dev_priv)
1032 {
1033         del_timer_sync(&dev_priv->hotplug_reenable_timer);
1034 }
1035
1036 static void ironlake_rps_change_irq_handler(struct drm_device *dev)
1037 {
1038         struct drm_i915_private *dev_priv = dev->dev_private;
1039         u32 busy_up, busy_down, max_avg, min_avg;
1040         u8 new_delay;
1041
1042         spin_lock(&mchdev_lock);
1043
1044         I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
1045
1046         new_delay = dev_priv->ips.cur_delay;
1047
1048         I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
1049         busy_up = I915_READ(RCPREVBSYTUPAVG);
1050         busy_down = I915_READ(RCPREVBSYTDNAVG);
1051         max_avg = I915_READ(RCBMAXAVG);
1052         min_avg = I915_READ(RCBMINAVG);
1053
1054         /* Handle RCS change request from hw */
1055         if (busy_up > max_avg) {
1056                 if (dev_priv->ips.cur_delay != dev_priv->ips.max_delay)
1057                         new_delay = dev_priv->ips.cur_delay - 1;
1058                 if (new_delay < dev_priv->ips.max_delay)
1059                         new_delay = dev_priv->ips.max_delay;
1060         } else if (busy_down < min_avg) {
1061                 if (dev_priv->ips.cur_delay != dev_priv->ips.min_delay)
1062                         new_delay = dev_priv->ips.cur_delay + 1;
1063                 if (new_delay > dev_priv->ips.min_delay)
1064                         new_delay = dev_priv->ips.min_delay;
1065         }
1066
1067         if (ironlake_set_drps(dev, new_delay))
1068                 dev_priv->ips.cur_delay = new_delay;
1069
1070         spin_unlock(&mchdev_lock);
1071
1072         return;
1073 }
1074
1075 static void notify_ring(struct drm_device *dev,
1076                         struct intel_ring_buffer *ring)
1077 {
1078         if (ring->obj == NULL)
1079                 return;
1080
1081         trace_i915_gem_request_complete(ring);
1082
1083         wake_up_all(&ring->irq_queue);
1084         i915_queue_hangcheck(dev);
1085 }
1086
1087 static void gen6_pm_rps_work(struct work_struct *work)
1088 {
1089         struct drm_i915_private *dev_priv =
1090                 container_of(work, struct drm_i915_private, rps.work);
1091         u32 pm_iir;
1092         int new_delay, adj;
1093
1094         spin_lock_irq(&dev_priv->irq_lock);
1095         pm_iir = dev_priv->rps.pm_iir;
1096         dev_priv->rps.pm_iir = 0;
1097         /* Make sure not to corrupt PMIMR state used by ringbuffer code */
1098         snb_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
1099         spin_unlock_irq(&dev_priv->irq_lock);
1100
1101         /* Make sure we didn't queue anything we're not going to process. */
1102         WARN_ON(pm_iir & ~dev_priv->pm_rps_events);
1103
1104         if ((pm_iir & dev_priv->pm_rps_events) == 0)
1105                 return;
1106
1107         mutex_lock(&dev_priv->rps.hw_lock);
1108
1109         adj = dev_priv->rps.last_adj;
1110         if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
1111                 if (adj > 0)
1112                         adj *= 2;
1113                 else
1114                         adj = 1;
1115                 new_delay = dev_priv->rps.cur_freq + adj;
1116
1117                 /*
1118                  * For better performance, jump directly
1119                  * to RPe if we're below it.
1120                  */
1121                 if (new_delay < dev_priv->rps.efficient_freq)
1122                         new_delay = dev_priv->rps.efficient_freq;
1123         } else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) {
1124                 if (dev_priv->rps.cur_freq > dev_priv->rps.efficient_freq)
1125                         new_delay = dev_priv->rps.efficient_freq;
1126                 else
1127                         new_delay = dev_priv->rps.min_freq_softlimit;
1128                 adj = 0;
1129         } else if (pm_iir & GEN6_PM_RP_DOWN_THRESHOLD) {
1130                 if (adj < 0)
1131                         adj *= 2;
1132                 else
1133                         adj = -1;
1134                 new_delay = dev_priv->rps.cur_freq + adj;
1135         } else { /* unknown event */
1136                 new_delay = dev_priv->rps.cur_freq;
1137         }
1138
1139         /* sysfs frequency interfaces may have snuck in while servicing the
1140          * interrupt
1141          */
1142         new_delay = clamp_t(int, new_delay,
1143                             dev_priv->rps.min_freq_softlimit,
1144                             dev_priv->rps.max_freq_softlimit);
1145
1146         dev_priv->rps.last_adj = new_delay - dev_priv->rps.cur_freq;
1147
1148         if (IS_VALLEYVIEW(dev_priv->dev))
1149                 valleyview_set_rps(dev_priv->dev, new_delay);
1150         else
1151                 gen6_set_rps(dev_priv->dev, new_delay);
1152
1153         mutex_unlock(&dev_priv->rps.hw_lock);
1154 }
1155
1156
1157 /**
1158  * ivybridge_parity_work - Workqueue called when a parity error interrupt
1159  * occurred.
1160  * @work: workqueue struct
1161  *
1162  * Doesn't actually do anything except notify userspace. As a consequence of
1163  * this event, userspace should try to remap the bad rows since statistically
1164  * it is likely the same row is more likely to go bad again.
1165  */
1166 static void ivybridge_parity_work(struct work_struct *work)
1167 {
1168         struct drm_i915_private *dev_priv =
1169                 container_of(work, struct drm_i915_private, l3_parity.error_work);
1170         u32 error_status, row, bank, subbank;
1171         char *parity_event[6];
1172         uint32_t misccpctl;
1173         unsigned long flags;
1174         uint8_t slice = 0;
1175
1176         /* We must turn off DOP level clock gating to access the L3 registers.
1177          * In order to prevent a get/put style interface, acquire struct mutex
1178          * any time we access those registers.
1179          */
1180         mutex_lock(&dev_priv->dev->struct_mutex);
1181
1182         /* If we've screwed up tracking, just let the interrupt fire again */
1183         if (WARN_ON(!dev_priv->l3_parity.which_slice))
1184                 goto out;
1185
1186         misccpctl = I915_READ(GEN7_MISCCPCTL);
1187         I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
1188         POSTING_READ(GEN7_MISCCPCTL);
1189
1190         while ((slice = ffs(dev_priv->l3_parity.which_slice)) != 0) {
1191                 u32 reg;
1192
1193                 slice--;
1194                 if (WARN_ON_ONCE(slice >= NUM_L3_SLICES(dev_priv->dev)))
1195                         break;
1196
1197                 dev_priv->l3_parity.which_slice &= ~(1<<slice);
1198
1199                 reg = GEN7_L3CDERRST1 + (slice * 0x200);
1200
1201                 error_status = I915_READ(reg);
1202                 row = GEN7_PARITY_ERROR_ROW(error_status);
1203                 bank = GEN7_PARITY_ERROR_BANK(error_status);
1204                 subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);
1205
1206                 I915_WRITE(reg, GEN7_PARITY_ERROR_VALID | GEN7_L3CDERRST1_ENABLE);
1207                 POSTING_READ(reg);
1208
1209                 parity_event[0] = I915_L3_PARITY_UEVENT "=1";
1210                 parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row);
1211                 parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank);
1212                 parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank);
1213                 parity_event[4] = kasprintf(GFP_KERNEL, "SLICE=%d", slice);
1214                 parity_event[5] = NULL;
1215
1216                 kobject_uevent_env(&dev_priv->dev->primary->kdev->kobj,
1217                                    KOBJ_CHANGE, parity_event);
1218
1219                 DRM_DEBUG("Parity error: Slice = %d, Row = %d, Bank = %d, Sub bank = %d.\n",
1220                           slice, row, bank, subbank);
1221
1222                 kfree(parity_event[4]);
1223                 kfree(parity_event[3]);
1224                 kfree(parity_event[2]);
1225                 kfree(parity_event[1]);
1226         }
1227
1228         I915_WRITE(GEN7_MISCCPCTL, misccpctl);
1229
1230 out:
1231         WARN_ON(dev_priv->l3_parity.which_slice);
1232         spin_lock_irqsave(&dev_priv->irq_lock, flags);
1233         ilk_enable_gt_irq(dev_priv, GT_PARITY_ERROR(dev_priv->dev));
1234         spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1235
1236         mutex_unlock(&dev_priv->dev->struct_mutex);
1237 }
1238
1239 static void ivybridge_parity_error_irq_handler(struct drm_device *dev, u32 iir)
1240 {
1241         struct drm_i915_private *dev_priv = dev->dev_private;
1242
1243         if (!HAS_L3_DPF(dev))
1244                 return;
1245
1246         spin_lock(&dev_priv->irq_lock);
1247         ilk_disable_gt_irq(dev_priv, GT_PARITY_ERROR(dev));
1248         spin_unlock(&dev_priv->irq_lock);
1249
1250         iir &= GT_PARITY_ERROR(dev);
1251         if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1)
1252                 dev_priv->l3_parity.which_slice |= 1 << 1;
1253
1254         if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT)
1255                 dev_priv->l3_parity.which_slice |= 1 << 0;
1256
1257         queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work);
1258 }
1259
1260 static void ilk_gt_irq_handler(struct drm_device *dev,
1261                                struct drm_i915_private *dev_priv,
1262                                u32 gt_iir)
1263 {
1264         if (gt_iir &
1265             (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
1266                 notify_ring(dev, &dev_priv->ring[RCS]);
1267         if (gt_iir & ILK_BSD_USER_INTERRUPT)
1268                 notify_ring(dev, &dev_priv->ring[VCS]);
1269 }
1270
1271 static void snb_gt_irq_handler(struct drm_device *dev,
1272                                struct drm_i915_private *dev_priv,
1273                                u32 gt_iir)
1274 {
1275
1276         if (gt_iir &
1277             (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
1278                 notify_ring(dev, &dev_priv->ring[RCS]);
1279         if (gt_iir & GT_BSD_USER_INTERRUPT)
1280                 notify_ring(dev, &dev_priv->ring[VCS]);
1281         if (gt_iir & GT_BLT_USER_INTERRUPT)
1282                 notify_ring(dev, &dev_priv->ring[BCS]);
1283
1284         if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT |
1285                       GT_BSD_CS_ERROR_INTERRUPT |
1286                       GT_RENDER_CS_MASTER_ERROR_INTERRUPT)) {
1287                 i915_handle_error(dev, false, "GT error interrupt 0x%08x",
1288                                   gt_iir);
1289         }
1290
1291         if (gt_iir & GT_PARITY_ERROR(dev))
1292                 ivybridge_parity_error_irq_handler(dev, gt_iir);
1293 }
1294
1295 static irqreturn_t gen8_gt_irq_handler(struct drm_device *dev,
1296                                        struct drm_i915_private *dev_priv,
1297                                        u32 master_ctl)
1298 {
1299         u32 rcs, bcs, vcs;
1300         uint32_t tmp = 0;
1301         irqreturn_t ret = IRQ_NONE;
1302
1303         if (master_ctl & (GEN8_GT_RCS_IRQ | GEN8_GT_BCS_IRQ)) {
1304                 tmp = I915_READ(GEN8_GT_IIR(0));
1305                 if (tmp) {
1306                         ret = IRQ_HANDLED;
1307                         rcs = tmp >> GEN8_RCS_IRQ_SHIFT;
1308                         bcs = tmp >> GEN8_BCS_IRQ_SHIFT;
1309                         if (rcs & GT_RENDER_USER_INTERRUPT)
1310                                 notify_ring(dev, &dev_priv->ring[RCS]);
1311                         if (bcs & GT_RENDER_USER_INTERRUPT)
1312                                 notify_ring(dev, &dev_priv->ring[BCS]);
1313                         I915_WRITE(GEN8_GT_IIR(0), tmp);
1314                 } else
1315                         DRM_ERROR("The master control interrupt lied (GT0)!\n");
1316         }
1317
1318         if (master_ctl & GEN8_GT_VCS1_IRQ) {
1319                 tmp = I915_READ(GEN8_GT_IIR(1));
1320                 if (tmp) {
1321                         ret = IRQ_HANDLED;
1322                         vcs = tmp >> GEN8_VCS1_IRQ_SHIFT;
1323                         if (vcs & GT_RENDER_USER_INTERRUPT)
1324                                 notify_ring(dev, &dev_priv->ring[VCS]);
1325                         I915_WRITE(GEN8_GT_IIR(1), tmp);
1326                 } else
1327                         DRM_ERROR("The master control interrupt lied (GT1)!\n");
1328         }
1329
1330         if (master_ctl & GEN8_GT_VECS_IRQ) {
1331                 tmp = I915_READ(GEN8_GT_IIR(3));
1332                 if (tmp) {
1333                         ret = IRQ_HANDLED;
1334                         vcs = tmp >> GEN8_VECS_IRQ_SHIFT;
1335                         if (vcs & GT_RENDER_USER_INTERRUPT)
1336                                 notify_ring(dev, &dev_priv->ring[VECS]);
1337                         I915_WRITE(GEN8_GT_IIR(3), tmp);
1338                 } else
1339                         DRM_ERROR("The master control interrupt lied (GT3)!\n");
1340         }
1341
1342         return ret;
1343 }
1344
1345 #define HPD_STORM_DETECT_PERIOD 1000
1346 #define HPD_STORM_THRESHOLD 5
1347
1348 static inline void intel_hpd_irq_handler(struct drm_device *dev,
1349                                          u32 hotplug_trigger,
1350                                          const u32 *hpd)
1351 {
1352         struct drm_i915_private *dev_priv = dev->dev_private;
1353         int i;
1354         bool storm_detected = false;
1355
1356         if (!hotplug_trigger)
1357                 return;
1358
1359         DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
1360                           hotplug_trigger);
1361
1362         spin_lock(&dev_priv->irq_lock);
1363         for (i = 1; i < HPD_NUM_PINS; i++) {
1364
1365                 WARN_ONCE(hpd[i] & hotplug_trigger &&
1366                           dev_priv->hpd_stats[i].hpd_mark == HPD_DISABLED,
1367                           "Received HPD interrupt (0x%08x) on pin %d (0x%08x) although disabled\n",
1368                           hotplug_trigger, i, hpd[i]);
1369
1370                 if (!(hpd[i] & hotplug_trigger) ||
1371                     dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED)
1372                         continue;
1373
1374                 dev_priv->hpd_event_bits |= (1 << i);
1375                 if (!time_in_range(jiffies, dev_priv->hpd_stats[i].hpd_last_jiffies,
1376                                    dev_priv->hpd_stats[i].hpd_last_jiffies
1377                                    + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) {
1378                         dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies;
1379                         dev_priv->hpd_stats[i].hpd_cnt = 0;
1380                         DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", i);
1381                 } else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) {
1382                         dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
1383                         dev_priv->hpd_event_bits &= ~(1 << i);
1384                         DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", i);
1385                         storm_detected = true;
1386                 } else {
1387                         dev_priv->hpd_stats[i].hpd_cnt++;
1388                         DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", i,
1389                                       dev_priv->hpd_stats[i].hpd_cnt);
1390                 }
1391         }
1392
1393         if (storm_detected)
1394                 dev_priv->display.hpd_irq_setup(dev);
1395         spin_unlock(&dev_priv->irq_lock);
1396
1397         /*
1398          * Our hotplug handler can grab modeset locks (by calling down into the
1399          * fb helpers). Hence it must not be run on our own dev-priv->wq work
1400          * queue for otherwise the flush_work in the pageflip code will
1401          * deadlock.
1402          */
1403         schedule_work(&dev_priv->hotplug_work);
1404 }
1405
1406 static void gmbus_irq_handler(struct drm_device *dev)
1407 {
1408         struct drm_i915_private *dev_priv = dev->dev_private;
1409
1410         wake_up_all(&dev_priv->gmbus_wait_queue);
1411 }
1412
1413 static void dp_aux_irq_handler(struct drm_device *dev)
1414 {
1415         struct drm_i915_private *dev_priv = dev->dev_private;
1416
1417         wake_up_all(&dev_priv->gmbus_wait_queue);
1418 }
1419
1420 #if defined(CONFIG_DEBUG_FS)
1421 static void display_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe,
1422                                          uint32_t crc0, uint32_t crc1,
1423                                          uint32_t crc2, uint32_t crc3,
1424                                          uint32_t crc4)
1425 {
1426         struct drm_i915_private *dev_priv = dev->dev_private;
1427         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
1428         struct intel_pipe_crc_entry *entry;
1429         int head, tail;
1430
1431         spin_lock(&pipe_crc->lock);
1432
1433         if (!pipe_crc->entries) {
1434                 spin_unlock(&pipe_crc->lock);
1435                 DRM_ERROR("spurious interrupt\n");
1436                 return;
1437         }
1438
1439         head = pipe_crc->head;
1440         tail = pipe_crc->tail;
1441
1442         if (CIRC_SPACE(head, tail, INTEL_PIPE_CRC_ENTRIES_NR) < 1) {
1443                 spin_unlock(&pipe_crc->lock);
1444                 DRM_ERROR("CRC buffer overflowing\n");
1445                 return;
1446         }
1447
1448         entry = &pipe_crc->entries[head];
1449
1450         entry->frame = dev->driver->get_vblank_counter(dev, pipe);
1451         entry->crc[0] = crc0;
1452         entry->crc[1] = crc1;
1453         entry->crc[2] = crc2;
1454         entry->crc[3] = crc3;
1455         entry->crc[4] = crc4;
1456
1457         head = (head + 1) & (INTEL_PIPE_CRC_ENTRIES_NR - 1);
1458         pipe_crc->head = head;
1459
1460         spin_unlock(&pipe_crc->lock);
1461
1462         wake_up_interruptible(&pipe_crc->wq);
1463 }
1464 #else
1465 static inline void
1466 display_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe,
1467                              uint32_t crc0, uint32_t crc1,
1468                              uint32_t crc2, uint32_t crc3,
1469                              uint32_t crc4) {}
1470 #endif
1471
1472
1473 static void hsw_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe)
1474 {
1475         struct drm_i915_private *dev_priv = dev->dev_private;
1476
1477         display_pipe_crc_irq_handler(dev, pipe,
1478                                      I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
1479                                      0, 0, 0, 0);
1480 }
1481
1482 static void ivb_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe)
1483 {
1484         struct drm_i915_private *dev_priv = dev->dev_private;
1485
1486         display_pipe_crc_irq_handler(dev, pipe,
1487                                      I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
1488                                      I915_READ(PIPE_CRC_RES_2_IVB(pipe)),
1489                                      I915_READ(PIPE_CRC_RES_3_IVB(pipe)),
1490                                      I915_READ(PIPE_CRC_RES_4_IVB(pipe)),
1491                                      I915_READ(PIPE_CRC_RES_5_IVB(pipe)));
1492 }
1493
1494 static void i9xx_pipe_crc_irq_handler(struct drm_device *dev, enum pipe pipe)
1495 {
1496         struct drm_i915_private *dev_priv = dev->dev_private;
1497         uint32_t res1, res2;
1498
1499         if (INTEL_INFO(dev)->gen >= 3)
1500                 res1 = I915_READ(PIPE_CRC_RES_RES1_I915(pipe));
1501         else
1502                 res1 = 0;
1503
1504         if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
1505                 res2 = I915_READ(PIPE_CRC_RES_RES2_G4X(pipe));
1506         else
1507                 res2 = 0;
1508
1509         display_pipe_crc_irq_handler(dev, pipe,
1510                                      I915_READ(PIPE_CRC_RES_RED(pipe)),
1511                                      I915_READ(PIPE_CRC_RES_GREEN(pipe)),
1512                                      I915_READ(PIPE_CRC_RES_BLUE(pipe)),
1513                                      res1, res2);
1514 }
1515
1516 /* The RPS events need forcewake, so we add them to a work queue and mask their
1517  * IMR bits until the work is done. Other interrupts can be processed without
1518  * the work queue. */
1519 static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir)
1520 {
1521         if (pm_iir & dev_priv->pm_rps_events) {
1522                 spin_lock(&dev_priv->irq_lock);
1523                 dev_priv->rps.pm_iir |= pm_iir & dev_priv->pm_rps_events;
1524                 snb_disable_pm_irq(dev_priv, pm_iir & dev_priv->pm_rps_events);
1525                 spin_unlock(&dev_priv->irq_lock);
1526
1527                 queue_work(dev_priv->wq, &dev_priv->rps.work);
1528         }
1529
1530         if (HAS_VEBOX(dev_priv->dev)) {
1531                 if (pm_iir & PM_VEBOX_USER_INTERRUPT)
1532                         notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
1533
1534                 if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
1535                         i915_handle_error(dev_priv->dev, false,
1536                                           "VEBOX CS error interrupt 0x%08x",
1537                                           pm_iir);
1538                 }
1539         }
1540 }
1541
1542 static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir)
1543 {
1544         struct drm_i915_private *dev_priv = dev->dev_private;
1545         u32 pipe_stats[I915_MAX_PIPES] = { };
1546         int pipe;
1547
1548         spin_lock(&dev_priv->irq_lock);
1549         for_each_pipe(pipe) {
1550                 int reg;
1551                 u32 mask, iir_bit = 0;
1552
1553                 /*
1554                  * PIPESTAT bits get signalled even when the interrupt is
1555                  * disabled with the mask bits, and some of the status bits do
1556                  * not generate interrupts at all (like the underrun bit). Hence
1557                  * we need to be careful that we only handle what we want to
1558                  * handle.
1559                  */
1560                 mask = 0;
1561                 if (__cpu_fifo_underrun_reporting_enabled(dev, pipe))
1562                         mask |= PIPE_FIFO_UNDERRUN_STATUS;
1563
1564                 switch (pipe) {
1565                 case PIPE_A:
1566                         iir_bit = I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
1567                         break;
1568                 case PIPE_B:
1569                         iir_bit = I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
1570                         break;
1571                 }
1572                 if (iir & iir_bit)
1573                         mask |= dev_priv->pipestat_irq_mask[pipe];
1574
1575                 if (!mask)
1576                         continue;
1577
1578                 reg = PIPESTAT(pipe);
1579                 mask |= PIPESTAT_INT_ENABLE_MASK;
1580                 pipe_stats[pipe] = I915_READ(reg) & mask;
1581
1582                 /*
1583                  * Clear the PIPE*STAT regs before the IIR
1584                  */
1585                 if (pipe_stats[pipe] & (PIPE_FIFO_UNDERRUN_STATUS |
1586                                         PIPESTAT_INT_STATUS_MASK))
1587                         I915_WRITE(reg, pipe_stats[pipe]);
1588         }
1589         spin_unlock(&dev_priv->irq_lock);
1590
1591         for_each_pipe(pipe) {
1592                 if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
1593                         drm_handle_vblank(dev, pipe);
1594
1595                 if (pipe_stats[pipe] & PLANE_FLIP_DONE_INT_STATUS_VLV) {
1596                         intel_prepare_page_flip(dev, pipe);
1597                         intel_finish_page_flip(dev, pipe);
1598                 }
1599
1600                 if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
1601                         i9xx_pipe_crc_irq_handler(dev, pipe);
1602
1603                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS &&
1604                     intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
1605                         DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
1606         }
1607
1608         if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
1609                 gmbus_irq_handler(dev);
1610 }
1611
1612 static irqreturn_t valleyview_irq_handler(int irq, void *arg)
1613 {
1614         struct drm_device *dev = (struct drm_device *) arg;
1615         struct drm_i915_private *dev_priv = dev->dev_private;
1616         u32 iir, gt_iir, pm_iir;
1617         irqreturn_t ret = IRQ_NONE;
1618
1619         while (true) {
1620                 iir = I915_READ(VLV_IIR);
1621                 gt_iir = I915_READ(GTIIR);
1622                 pm_iir = I915_READ(GEN6_PMIIR);
1623
1624                 if (gt_iir == 0 && pm_iir == 0 && iir == 0)
1625                         goto out;
1626
1627                 ret = IRQ_HANDLED;
1628
1629                 snb_gt_irq_handler(dev, dev_priv, gt_iir);
1630
1631                 valleyview_pipestat_irq_handler(dev, iir);
1632
1633                 /* Consume port.  Then clear IIR or we'll miss events */
1634                 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
1635                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
1636                         u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
1637
1638                         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
1639
1640                         if (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
1641                                 dp_aux_irq_handler(dev);
1642
1643                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
1644                         I915_READ(PORT_HOTPLUG_STAT);
1645                 }
1646
1647
1648                 if (pm_iir)
1649                         gen6_rps_irq_handler(dev_priv, pm_iir);
1650
1651                 I915_WRITE(GTIIR, gt_iir);
1652                 I915_WRITE(GEN6_PMIIR, pm_iir);
1653                 I915_WRITE(VLV_IIR, iir);
1654         }
1655
1656 out:
1657         return ret;
1658 }
1659
1660 static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
1661 {
1662         struct drm_i915_private *dev_priv = dev->dev_private;
1663         int pipe;
1664         u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
1665
1666         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_ibx);
1667
1668         if (pch_iir & SDE_AUDIO_POWER_MASK) {
1669                 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
1670                                SDE_AUDIO_POWER_SHIFT);
1671                 DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
1672                                  port_name(port));
1673         }
1674
1675         if (pch_iir & SDE_AUX_MASK)
1676                 dp_aux_irq_handler(dev);
1677
1678         if (pch_iir & SDE_GMBUS)
1679                 gmbus_irq_handler(dev);
1680
1681         if (pch_iir & SDE_AUDIO_HDCP_MASK)
1682                 DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
1683
1684         if (pch_iir & SDE_AUDIO_TRANS_MASK)
1685                 DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
1686
1687         if (pch_iir & SDE_POISON)
1688                 DRM_ERROR("PCH poison interrupt\n");
1689
1690         if (pch_iir & SDE_FDI_MASK)
1691                 for_each_pipe(pipe)
1692                         DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
1693                                          pipe_name(pipe),
1694                                          I915_READ(FDI_RX_IIR(pipe)));
1695
1696         if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
1697                 DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
1698
1699         if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
1700                 DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
1701
1702         if (pch_iir & SDE_TRANSA_FIFO_UNDER)
1703                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1704                                                           false))
1705                         DRM_ERROR("PCH transcoder A FIFO underrun\n");
1706
1707         if (pch_iir & SDE_TRANSB_FIFO_UNDER)
1708                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1709                                                           false))
1710                         DRM_ERROR("PCH transcoder B FIFO underrun\n");
1711 }
1712
1713 static void ivb_err_int_handler(struct drm_device *dev)
1714 {
1715         struct drm_i915_private *dev_priv = dev->dev_private;
1716         u32 err_int = I915_READ(GEN7_ERR_INT);
1717         enum pipe pipe;
1718
1719         if (err_int & ERR_INT_POISON)
1720                 DRM_ERROR("Poison interrupt\n");
1721
1722         for_each_pipe(pipe) {
1723                 if (err_int & ERR_INT_FIFO_UNDERRUN(pipe)) {
1724                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe,
1725                                                                   false))
1726                                 DRM_ERROR("Pipe %c FIFO underrun\n",
1727                                           pipe_name(pipe));
1728                 }
1729
1730                 if (err_int & ERR_INT_PIPE_CRC_DONE(pipe)) {
1731                         if (IS_IVYBRIDGE(dev))
1732                                 ivb_pipe_crc_irq_handler(dev, pipe);
1733                         else
1734                                 hsw_pipe_crc_irq_handler(dev, pipe);
1735                 }
1736         }
1737
1738         I915_WRITE(GEN7_ERR_INT, err_int);
1739 }
1740
1741 static void cpt_serr_int_handler(struct drm_device *dev)
1742 {
1743         struct drm_i915_private *dev_priv = dev->dev_private;
1744         u32 serr_int = I915_READ(SERR_INT);
1745
1746         if (serr_int & SERR_INT_POISON)
1747                 DRM_ERROR("PCH poison interrupt\n");
1748
1749         if (serr_int & SERR_INT_TRANS_A_FIFO_UNDERRUN)
1750                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1751                                                           false))
1752                         DRM_ERROR("PCH transcoder A FIFO underrun\n");
1753
1754         if (serr_int & SERR_INT_TRANS_B_FIFO_UNDERRUN)
1755                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1756                                                           false))
1757                         DRM_ERROR("PCH transcoder B FIFO underrun\n");
1758
1759         if (serr_int & SERR_INT_TRANS_C_FIFO_UNDERRUN)
1760                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_C,
1761                                                           false))
1762                         DRM_ERROR("PCH transcoder C FIFO underrun\n");
1763
1764         I915_WRITE(SERR_INT, serr_int);
1765 }
1766
1767 static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
1768 {
1769         struct drm_i915_private *dev_priv = dev->dev_private;
1770         int pipe;
1771         u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
1772
1773         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_cpt);
1774
1775         if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
1776                 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
1777                                SDE_AUDIO_POWER_SHIFT_CPT);
1778                 DRM_DEBUG_DRIVER("PCH audio power change on port %c\n",
1779                                  port_name(port));
1780         }
1781
1782         if (pch_iir & SDE_AUX_MASK_CPT)
1783                 dp_aux_irq_handler(dev);
1784
1785         if (pch_iir & SDE_GMBUS_CPT)
1786                 gmbus_irq_handler(dev);
1787
1788         if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
1789                 DRM_DEBUG_DRIVER("Audio CP request interrupt\n");
1790
1791         if (pch_iir & SDE_AUDIO_CP_CHG_CPT)
1792                 DRM_DEBUG_DRIVER("Audio CP change interrupt\n");
1793
1794         if (pch_iir & SDE_FDI_MASK_CPT)
1795                 for_each_pipe(pipe)
1796                         DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
1797                                          pipe_name(pipe),
1798                                          I915_READ(FDI_RX_IIR(pipe)));
1799
1800         if (pch_iir & SDE_ERROR_CPT)
1801                 cpt_serr_int_handler(dev);
1802 }
1803
1804 static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
1805 {
1806         struct drm_i915_private *dev_priv = dev->dev_private;
1807         enum pipe pipe;
1808
1809         if (de_iir & DE_AUX_CHANNEL_A)
1810                 dp_aux_irq_handler(dev);
1811
1812         if (de_iir & DE_GSE)
1813                 intel_opregion_asle_intr(dev);
1814
1815         if (de_iir & DE_POISON)
1816                 DRM_ERROR("Poison interrupt\n");
1817
1818         for_each_pipe(pipe) {
1819                 if (de_iir & DE_PIPE_VBLANK(pipe))
1820                         drm_handle_vblank(dev, pipe);
1821
1822                 if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe))
1823                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
1824                                 DRM_ERROR("Pipe %c FIFO underrun\n",
1825                                           pipe_name(pipe));
1826
1827                 if (de_iir & DE_PIPE_CRC_DONE(pipe))
1828                         i9xx_pipe_crc_irq_handler(dev, pipe);
1829
1830                 /* plane/pipes map 1:1 on ilk+ */
1831                 if (de_iir & DE_PLANE_FLIP_DONE(pipe)) {
1832                         intel_prepare_page_flip(dev, pipe);
1833                         intel_finish_page_flip_plane(dev, pipe);
1834                 }
1835         }
1836
1837         /* check event from PCH */
1838         if (de_iir & DE_PCH_EVENT) {
1839                 u32 pch_iir = I915_READ(SDEIIR);
1840
1841                 if (HAS_PCH_CPT(dev))
1842                         cpt_irq_handler(dev, pch_iir);
1843                 else
1844                         ibx_irq_handler(dev, pch_iir);
1845
1846                 /* should clear PCH hotplug event before clear CPU irq */
1847                 I915_WRITE(SDEIIR, pch_iir);
1848         }
1849
1850         if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT)
1851                 ironlake_rps_change_irq_handler(dev);
1852 }
1853
1854 static void ivb_display_irq_handler(struct drm_device *dev, u32 de_iir)
1855 {
1856         struct drm_i915_private *dev_priv = dev->dev_private;
1857         enum pipe pipe;
1858
1859         if (de_iir & DE_ERR_INT_IVB)
1860                 ivb_err_int_handler(dev);
1861
1862         if (de_iir & DE_AUX_CHANNEL_A_IVB)
1863                 dp_aux_irq_handler(dev);
1864
1865         if (de_iir & DE_GSE_IVB)
1866                 intel_opregion_asle_intr(dev);
1867
1868         for_each_pipe(pipe) {
1869                 if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)))
1870                         drm_handle_vblank(dev, pipe);
1871
1872                 /* plane/pipes map 1:1 on ilk+ */
1873                 if (de_iir & DE_PLANE_FLIP_DONE_IVB(pipe)) {
1874                         intel_prepare_page_flip(dev, pipe);
1875                         intel_finish_page_flip_plane(dev, pipe);
1876                 }
1877         }
1878
1879         /* check event from PCH */
1880         if (!HAS_PCH_NOP(dev) && (de_iir & DE_PCH_EVENT_IVB)) {
1881                 u32 pch_iir = I915_READ(SDEIIR);
1882
1883                 cpt_irq_handler(dev, pch_iir);
1884
1885                 /* clear PCH hotplug event before clear CPU irq */
1886                 I915_WRITE(SDEIIR, pch_iir);
1887         }
1888 }
1889
1890 static irqreturn_t ironlake_irq_handler(int irq, void *arg)
1891 {
1892         struct drm_device *dev = (struct drm_device *) arg;
1893         struct drm_i915_private *dev_priv = dev->dev_private;
1894         u32 de_iir, gt_iir, de_ier, sde_ier = 0;
1895         irqreturn_t ret = IRQ_NONE;
1896
1897         /* We get interrupts on unclaimed registers, so check for this before we
1898          * do any I915_{READ,WRITE}. */
1899         intel_uncore_check_errors(dev);
1900
1901         /* disable master interrupt before clearing iir  */
1902         de_ier = I915_READ(DEIER);
1903         I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
1904         POSTING_READ(DEIER);
1905
1906         /* Disable south interrupts. We'll only write to SDEIIR once, so further
1907          * interrupts will will be stored on its back queue, and then we'll be
1908          * able to process them after we restore SDEIER (as soon as we restore
1909          * it, we'll get an interrupt if SDEIIR still has something to process
1910          * due to its back queue). */
1911         if (!HAS_PCH_NOP(dev)) {
1912                 sde_ier = I915_READ(SDEIER);
1913                 I915_WRITE(SDEIER, 0);
1914                 POSTING_READ(SDEIER);
1915         }
1916
1917         gt_iir = I915_READ(GTIIR);
1918         if (gt_iir) {
1919                 if (INTEL_INFO(dev)->gen >= 6)
1920                         snb_gt_irq_handler(dev, dev_priv, gt_iir);
1921                 else
1922                         ilk_gt_irq_handler(dev, dev_priv, gt_iir);
1923                 I915_WRITE(GTIIR, gt_iir);
1924                 ret = IRQ_HANDLED;
1925         }
1926
1927         de_iir = I915_READ(DEIIR);
1928         if (de_iir) {
1929                 if (INTEL_INFO(dev)->gen >= 7)
1930                         ivb_display_irq_handler(dev, de_iir);
1931                 else
1932                         ilk_display_irq_handler(dev, de_iir);
1933                 I915_WRITE(DEIIR, de_iir);
1934                 ret = IRQ_HANDLED;
1935         }
1936
1937         if (INTEL_INFO(dev)->gen >= 6) {
1938                 u32 pm_iir = I915_READ(GEN6_PMIIR);
1939                 if (pm_iir) {
1940                         gen6_rps_irq_handler(dev_priv, pm_iir);
1941                         I915_WRITE(GEN6_PMIIR, pm_iir);
1942                         ret = IRQ_HANDLED;
1943                 }
1944         }
1945
1946         I915_WRITE(DEIER, de_ier);
1947         POSTING_READ(DEIER);
1948         if (!HAS_PCH_NOP(dev)) {
1949                 I915_WRITE(SDEIER, sde_ier);
1950                 POSTING_READ(SDEIER);
1951         }
1952
1953         return ret;
1954 }
1955
1956 static irqreturn_t gen8_irq_handler(int irq, void *arg)
1957 {
1958         struct drm_device *dev = arg;
1959         struct drm_i915_private *dev_priv = dev->dev_private;
1960         u32 master_ctl;
1961         irqreturn_t ret = IRQ_NONE;
1962         uint32_t tmp = 0;
1963         enum pipe pipe;
1964
1965         master_ctl = I915_READ(GEN8_MASTER_IRQ);
1966         master_ctl &= ~GEN8_MASTER_IRQ_CONTROL;
1967         if (!master_ctl)
1968                 return IRQ_NONE;
1969
1970         I915_WRITE(GEN8_MASTER_IRQ, 0);
1971         POSTING_READ(GEN8_MASTER_IRQ);
1972
1973         ret = gen8_gt_irq_handler(dev, dev_priv, master_ctl);
1974
1975         if (master_ctl & GEN8_DE_MISC_IRQ) {
1976                 tmp = I915_READ(GEN8_DE_MISC_IIR);
1977                 if (tmp & GEN8_DE_MISC_GSE)
1978                         intel_opregion_asle_intr(dev);
1979                 else if (tmp)
1980                         DRM_ERROR("Unexpected DE Misc interrupt\n");
1981                 else
1982                         DRM_ERROR("The master control interrupt lied (DE MISC)!\n");
1983
1984                 if (tmp) {
1985                         I915_WRITE(GEN8_DE_MISC_IIR, tmp);
1986                         ret = IRQ_HANDLED;
1987                 }
1988         }
1989
1990         if (master_ctl & GEN8_DE_PORT_IRQ) {
1991                 tmp = I915_READ(GEN8_DE_PORT_IIR);
1992                 if (tmp & GEN8_AUX_CHANNEL_A)
1993                         dp_aux_irq_handler(dev);
1994                 else if (tmp)
1995                         DRM_ERROR("Unexpected DE Port interrupt\n");
1996                 else
1997                         DRM_ERROR("The master control interrupt lied (DE PORT)!\n");
1998
1999                 if (tmp) {
2000                         I915_WRITE(GEN8_DE_PORT_IIR, tmp);
2001                         ret = IRQ_HANDLED;
2002                 }
2003         }
2004
2005         for_each_pipe(pipe) {
2006                 uint32_t pipe_iir;
2007
2008                 if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe)))
2009                         continue;
2010
2011                 pipe_iir = I915_READ(GEN8_DE_PIPE_IIR(pipe));
2012                 if (pipe_iir & GEN8_PIPE_VBLANK)
2013                         drm_handle_vblank(dev, pipe);
2014
2015                 if (pipe_iir & GEN8_PIPE_FLIP_DONE) {
2016                         intel_prepare_page_flip(dev, pipe);
2017                         intel_finish_page_flip_plane(dev, pipe);
2018                 }
2019
2020                 if (pipe_iir & GEN8_PIPE_CDCLK_CRC_DONE)
2021                         hsw_pipe_crc_irq_handler(dev, pipe);
2022
2023                 if (pipe_iir & GEN8_PIPE_FIFO_UNDERRUN) {
2024                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe,
2025                                                                   false))
2026                                 DRM_ERROR("Pipe %c FIFO underrun\n",
2027                                           pipe_name(pipe));
2028                 }
2029
2030                 if (pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS) {
2031                         DRM_ERROR("Fault errors on pipe %c\n: 0x%08x",
2032                                   pipe_name(pipe),
2033                                   pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS);
2034                 }
2035
2036                 if (pipe_iir) {
2037                         ret = IRQ_HANDLED;
2038                         I915_WRITE(GEN8_DE_PIPE_IIR(pipe), pipe_iir);
2039                 } else
2040                         DRM_ERROR("The master control interrupt lied (DE PIPE)!\n");
2041         }
2042
2043         if (!HAS_PCH_NOP(dev) && master_ctl & GEN8_DE_PCH_IRQ) {
2044                 /*
2045                  * FIXME(BDW): Assume for now that the new interrupt handling
2046                  * scheme also closed the SDE interrupt handling race we've seen
2047                  * on older pch-split platforms. But this needs testing.
2048                  */
2049                 u32 pch_iir = I915_READ(SDEIIR);
2050
2051                 cpt_irq_handler(dev, pch_iir);
2052
2053                 if (pch_iir) {
2054                         I915_WRITE(SDEIIR, pch_iir);
2055                         ret = IRQ_HANDLED;
2056                 }
2057         }
2058
2059         I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
2060         POSTING_READ(GEN8_MASTER_IRQ);
2061
2062         return ret;
2063 }
2064
2065 static void i915_error_wake_up(struct drm_i915_private *dev_priv,
2066                                bool reset_completed)
2067 {
2068         struct intel_ring_buffer *ring;
2069         int i;
2070
2071         /*
2072          * Notify all waiters for GPU completion events that reset state has
2073          * been changed, and that they need to restart their wait after
2074          * checking for potential errors (and bail out to drop locks if there is
2075          * a gpu reset pending so that i915_error_work_func can acquire them).
2076          */
2077
2078         /* Wake up __wait_seqno, potentially holding dev->struct_mutex. */
2079         for_each_ring(ring, dev_priv, i)
2080                 wake_up_all(&ring->irq_queue);
2081
2082         /* Wake up intel_crtc_wait_for_pending_flips, holding crtc->mutex. */
2083         wake_up_all(&dev_priv->pending_flip_queue);
2084
2085         /*
2086          * Signal tasks blocked in i915_gem_wait_for_error that the pending
2087          * reset state is cleared.
2088          */
2089         if (reset_completed)
2090                 wake_up_all(&dev_priv->gpu_error.reset_queue);
2091 }
2092
2093 /**
2094  * i915_error_work_func - do process context error handling work
2095  * @work: work struct
2096  *
2097  * Fire an error uevent so userspace can see that a hang or error
2098  * was detected.
2099  */
2100 static void i915_error_work_func(struct work_struct *work)
2101 {
2102         struct i915_gpu_error *error = container_of(work, struct i915_gpu_error,
2103                                                     work);
2104         struct drm_i915_private *dev_priv =
2105                 container_of(error, struct drm_i915_private, gpu_error);
2106         struct drm_device *dev = dev_priv->dev;
2107         char *error_event[] = { I915_ERROR_UEVENT "=1", NULL };
2108         char *reset_event[] = { I915_RESET_UEVENT "=1", NULL };
2109         char *reset_done_event[] = { I915_ERROR_UEVENT "=0", NULL };
2110         int ret;
2111
2112         kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, error_event);
2113
2114         /*
2115          * Note that there's only one work item which does gpu resets, so we
2116          * need not worry about concurrent gpu resets potentially incrementing
2117          * error->reset_counter twice. We only need to take care of another
2118          * racing irq/hangcheck declaring the gpu dead for a second time. A
2119          * quick check for that is good enough: schedule_work ensures the
2120          * correct ordering between hang detection and this work item, and since
2121          * the reset in-progress bit is only ever set by code outside of this
2122          * work we don't need to worry about any other races.
2123          */
2124         if (i915_reset_in_progress(error) && !i915_terminally_wedged(error)) {
2125                 DRM_DEBUG_DRIVER("resetting chip\n");
2126                 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE,
2127                                    reset_event);
2128
2129                 /*
2130                  * All state reset _must_ be completed before we update the
2131                  * reset counter, for otherwise waiters might miss the reset
2132                  * pending state and not properly drop locks, resulting in
2133                  * deadlocks with the reset work.
2134                  */
2135                 ret = i915_reset(dev);
2136
2137                 intel_display_handle_reset(dev);
2138
2139                 if (ret == 0) {
2140                         /*
2141                          * After all the gem state is reset, increment the reset
2142                          * counter and wake up everyone waiting for the reset to
2143                          * complete.
2144                          *
2145                          * Since unlock operations are a one-sided barrier only,
2146                          * we need to insert a barrier here to order any seqno
2147                          * updates before
2148                          * the counter increment.
2149                          */
2150                         smp_mb__before_atomic_inc();
2151                         atomic_inc(&dev_priv->gpu_error.reset_counter);
2152
2153                         kobject_uevent_env(&dev->primary->kdev->kobj,
2154                                            KOBJ_CHANGE, reset_done_event);
2155                 } else {
2156                         atomic_set_mask(I915_WEDGED, &error->reset_counter);
2157                 }
2158
2159                 /*
2160                  * Note: The wake_up also serves as a memory barrier so that
2161                  * waiters see the update value of the reset counter atomic_t.
2162                  */
2163                 i915_error_wake_up(dev_priv, true);
2164         }
2165 }
2166
2167 static void i915_report_and_clear_eir(struct drm_device *dev)
2168 {
2169         struct drm_i915_private *dev_priv = dev->dev_private;
2170         uint32_t instdone[I915_NUM_INSTDONE_REG];
2171         u32 eir = I915_READ(EIR);
2172         int pipe, i;
2173
2174         if (!eir)
2175                 return;
2176
2177         pr_err("render error detected, EIR: 0x%08x\n", eir);
2178
2179         i915_get_extra_instdone(dev, instdone);
2180
2181         if (IS_G4X(dev)) {
2182                 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
2183                         u32 ipeir = I915_READ(IPEIR_I965);
2184
2185                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2186                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2187                         for (i = 0; i < ARRAY_SIZE(instdone); i++)
2188                                 pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2189                         pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
2190                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2191                         I915_WRITE(IPEIR_I965, ipeir);
2192                         POSTING_READ(IPEIR_I965);
2193                 }
2194                 if (eir & GM45_ERROR_PAGE_TABLE) {
2195                         u32 pgtbl_err = I915_READ(PGTBL_ER);
2196                         pr_err("page table error\n");
2197                         pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
2198                         I915_WRITE(PGTBL_ER, pgtbl_err);
2199                         POSTING_READ(PGTBL_ER);
2200                 }
2201         }
2202
2203         if (!IS_GEN2(dev)) {
2204                 if (eir & I915_ERROR_PAGE_TABLE) {
2205                         u32 pgtbl_err = I915_READ(PGTBL_ER);
2206                         pr_err("page table error\n");
2207                         pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
2208                         I915_WRITE(PGTBL_ER, pgtbl_err);
2209                         POSTING_READ(PGTBL_ER);
2210                 }
2211         }
2212
2213         if (eir & I915_ERROR_MEMORY_REFRESH) {
2214                 pr_err("memory refresh error:\n");
2215                 for_each_pipe(pipe)
2216                         pr_err("pipe %c stat: 0x%08x\n",
2217                                pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
2218                 /* pipestat has already been acked */
2219         }
2220         if (eir & I915_ERROR_INSTRUCTION) {
2221                 pr_err("instruction error\n");
2222                 pr_err("  INSTPM: 0x%08x\n", I915_READ(INSTPM));
2223                 for (i = 0; i < ARRAY_SIZE(instdone); i++)
2224                         pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2225                 if (INTEL_INFO(dev)->gen < 4) {
2226                         u32 ipeir = I915_READ(IPEIR);
2227
2228                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR));
2229                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR));
2230                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD));
2231                         I915_WRITE(IPEIR, ipeir);
2232                         POSTING_READ(IPEIR);
2233                 } else {
2234                         u32 ipeir = I915_READ(IPEIR_I965);
2235
2236                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2237                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2238                         pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
2239                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2240                         I915_WRITE(IPEIR_I965, ipeir);
2241                         POSTING_READ(IPEIR_I965);
2242                 }
2243         }
2244
2245         I915_WRITE(EIR, eir);
2246         POSTING_READ(EIR);
2247         eir = I915_READ(EIR);
2248         if (eir) {
2249                 /*
2250                  * some errors might have become stuck,
2251                  * mask them.
2252                  */
2253                 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
2254                 I915_WRITE(EMR, I915_READ(EMR) | eir);
2255                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
2256         }
2257 }
2258
2259 /**
2260  * i915_handle_error - handle an error interrupt
2261  * @dev: drm device
2262  *
2263  * Do some basic checking of regsiter state at error interrupt time and
2264  * dump it to the syslog.  Also call i915_capture_error_state() to make
2265  * sure we get a record and make it available in debugfs.  Fire a uevent
2266  * so userspace knows something bad happened (should trigger collection
2267  * of a ring dump etc.).
2268  */
2269 void i915_handle_error(struct drm_device *dev, bool wedged,
2270                        const char *fmt, ...)
2271 {
2272         struct drm_i915_private *dev_priv = dev->dev_private;
2273         va_list args;
2274         char error_msg[80];
2275
2276         va_start(args, fmt);
2277         vscnprintf(error_msg, sizeof(error_msg), fmt, args);
2278         va_end(args);
2279
2280         i915_capture_error_state(dev, wedged, error_msg);
2281         i915_report_and_clear_eir(dev);
2282
2283         if (wedged) {
2284                 atomic_set_mask(I915_RESET_IN_PROGRESS_FLAG,
2285                                 &dev_priv->gpu_error.reset_counter);
2286
2287                 /*
2288                  * Wakeup waiting processes so that the reset work function
2289                  * i915_error_work_func doesn't deadlock trying to grab various
2290                  * locks. By bumping the reset counter first, the woken
2291                  * processes will see a reset in progress and back off,
2292                  * releasing their locks and then wait for the reset completion.
2293                  * We must do this for _all_ gpu waiters that might hold locks
2294                  * that the reset work needs to acquire.
2295                  *
2296                  * Note: The wake_up serves as the required memory barrier to
2297                  * ensure that the waiters see the updated value of the reset
2298                  * counter atomic_t.
2299                  */
2300                 i915_error_wake_up(dev_priv, false);
2301         }
2302
2303         /*
2304          * Our reset work can grab modeset locks (since it needs to reset the
2305          * state of outstanding pagelips). Hence it must not be run on our own
2306          * dev-priv->wq work queue for otherwise the flush_work in the pageflip
2307          * code will deadlock.
2308          */
2309         schedule_work(&dev_priv->gpu_error.work);
2310 }
2311
2312 static void __always_unused i915_pageflip_stall_check(struct drm_device *dev, int pipe)
2313 {
2314         struct drm_i915_private *dev_priv = dev->dev_private;
2315         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
2316         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2317         struct drm_i915_gem_object *obj;
2318         struct intel_unpin_work *work;
2319         unsigned long flags;
2320         bool stall_detected;
2321
2322         /* Ignore early vblank irqs */
2323         if (intel_crtc == NULL)
2324                 return;
2325
2326         spin_lock_irqsave(&dev->event_lock, flags);
2327         work = intel_crtc->unpin_work;
2328
2329         if (work == NULL ||
2330             atomic_read(&work->pending) >= INTEL_FLIP_COMPLETE ||
2331             !work->enable_stall_check) {
2332                 /* Either the pending flip IRQ arrived, or we're too early. Don't check */
2333                 spin_unlock_irqrestore(&dev->event_lock, flags);
2334                 return;
2335         }
2336
2337         /* Potential stall - if we see that the flip has happened, assume a missed interrupt */
2338         obj = work->pending_flip_obj;
2339         if (INTEL_INFO(dev)->gen >= 4) {
2340                 int dspsurf = DSPSURF(intel_crtc->plane);
2341                 stall_detected = I915_HI_DISPBASE(I915_READ(dspsurf)) ==
2342                                         i915_gem_obj_ggtt_offset(obj);
2343         } else {
2344                 int dspaddr = DSPADDR(intel_crtc->plane);
2345                 stall_detected = I915_READ(dspaddr) == (i915_gem_obj_ggtt_offset(obj) +
2346                                                         crtc->y * crtc->primary->fb->pitches[0] +
2347                                                         crtc->x * crtc->primary->fb->bits_per_pixel/8);
2348         }
2349
2350         spin_unlock_irqrestore(&dev->event_lock, flags);
2351
2352         if (stall_detected) {
2353                 DRM_DEBUG_DRIVER("Pageflip stall detected\n");
2354                 intel_prepare_page_flip(dev, intel_crtc->plane);
2355         }
2356 }
2357
2358 /* Called from drm generic code, passed 'crtc' which
2359  * we use as a pipe index
2360  */
2361 static int i915_enable_vblank(struct drm_device *dev, int pipe)
2362 {
2363         struct drm_i915_private *dev_priv = dev->dev_private;
2364         unsigned long irqflags;
2365
2366         if (!i915_pipe_enabled(dev, pipe))
2367                 return -EINVAL;
2368
2369         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2370         if (INTEL_INFO(dev)->gen >= 4)
2371                 i915_enable_pipestat(dev_priv, pipe,
2372                                      PIPE_START_VBLANK_INTERRUPT_STATUS);
2373         else
2374                 i915_enable_pipestat(dev_priv, pipe,
2375                                      PIPE_VBLANK_INTERRUPT_STATUS);
2376
2377         /* maintain vblank delivery even in deep C-states */
2378         if (INTEL_INFO(dev)->gen == 3)
2379                 I915_WRITE(INSTPM, _MASKED_BIT_DISABLE(INSTPM_AGPBUSY_DIS));
2380         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2381
2382         return 0;
2383 }
2384
2385 static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
2386 {
2387         struct drm_i915_private *dev_priv = dev->dev_private;
2388         unsigned long irqflags;
2389         uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) :
2390                                                      DE_PIPE_VBLANK(pipe);
2391
2392         if (!i915_pipe_enabled(dev, pipe))
2393                 return -EINVAL;
2394
2395         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2396         ironlake_enable_display_irq(dev_priv, bit);
2397         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2398
2399         return 0;
2400 }
2401
2402 static int valleyview_enable_vblank(struct drm_device *dev, int pipe)
2403 {
2404         struct drm_i915_private *dev_priv = dev->dev_private;
2405         unsigned long irqflags;
2406
2407         if (!i915_pipe_enabled(dev, pipe))
2408                 return -EINVAL;
2409
2410         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2411         i915_enable_pipestat(dev_priv, pipe,
2412                              PIPE_START_VBLANK_INTERRUPT_STATUS);
2413         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2414
2415         return 0;
2416 }
2417
2418 static int gen8_enable_vblank(struct drm_device *dev, int pipe)
2419 {
2420         struct drm_i915_private *dev_priv = dev->dev_private;
2421         unsigned long irqflags;
2422
2423         if (!i915_pipe_enabled(dev, pipe))
2424                 return -EINVAL;
2425
2426         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2427         dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_VBLANK;
2428         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
2429         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
2430         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2431         return 0;
2432 }
2433
2434 /* Called from drm generic code, passed 'crtc' which
2435  * we use as a pipe index
2436  */
2437 static void i915_disable_vblank(struct drm_device *dev, int pipe)
2438 {
2439         struct drm_i915_private *dev_priv = dev->dev_private;
2440         unsigned long irqflags;
2441
2442         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2443         if (INTEL_INFO(dev)->gen == 3)
2444                 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_DIS));
2445
2446         i915_disable_pipestat(dev_priv, pipe,
2447                               PIPE_VBLANK_INTERRUPT_STATUS |
2448                               PIPE_START_VBLANK_INTERRUPT_STATUS);
2449         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2450 }
2451
2452 static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
2453 {
2454         struct drm_i915_private *dev_priv = dev->dev_private;
2455         unsigned long irqflags;
2456         uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) :
2457                                                      DE_PIPE_VBLANK(pipe);
2458
2459         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2460         ironlake_disable_display_irq(dev_priv, bit);
2461         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2462 }
2463
2464 static void valleyview_disable_vblank(struct drm_device *dev, int pipe)
2465 {
2466         struct drm_i915_private *dev_priv = dev->dev_private;
2467         unsigned long irqflags;
2468
2469         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2470         i915_disable_pipestat(dev_priv, pipe,
2471                               PIPE_START_VBLANK_INTERRUPT_STATUS);
2472         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2473 }
2474
2475 static void gen8_disable_vblank(struct drm_device *dev, int pipe)
2476 {
2477         struct drm_i915_private *dev_priv = dev->dev_private;
2478         unsigned long irqflags;
2479
2480         if (!i915_pipe_enabled(dev, pipe))
2481                 return;
2482
2483         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2484         dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_VBLANK;
2485         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
2486         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
2487         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2488 }
2489
2490 static u32
2491 ring_last_seqno(struct intel_ring_buffer *ring)
2492 {
2493         return list_entry(ring->request_list.prev,
2494                           struct drm_i915_gem_request, list)->seqno;
2495 }
2496
2497 static bool
2498 ring_idle(struct intel_ring_buffer *ring, u32 seqno)
2499 {
2500         return (list_empty(&ring->request_list) ||
2501                 i915_seqno_passed(seqno, ring_last_seqno(ring)));
2502 }
2503
2504 static struct intel_ring_buffer *
2505 semaphore_waits_for(struct intel_ring_buffer *ring, u32 *seqno)
2506 {
2507         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2508         u32 cmd, ipehr, head;
2509         int i;
2510
2511         ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
2512         if ((ipehr & ~(0x3 << 16)) !=
2513             (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER))
2514                 return NULL;
2515
2516         /*
2517          * HEAD is likely pointing to the dword after the actual command,
2518          * so scan backwards until we find the MBOX. But limit it to just 3
2519          * dwords. Note that we don't care about ACTHD here since that might
2520          * point at at batch, and semaphores are always emitted into the
2521          * ringbuffer itself.
2522          */
2523         head = I915_READ_HEAD(ring) & HEAD_ADDR;
2524
2525         for (i = 4; i; --i) {
2526                 /*
2527                  * Be paranoid and presume the hw has gone off into the wild -
2528                  * our ring is smaller than what the hardware (and hence
2529                  * HEAD_ADDR) allows. Also handles wrap-around.
2530                  */
2531                 head &= ring->size - 1;
2532
2533                 /* This here seems to blow up */
2534                 cmd = ioread32(ring->virtual_start + head);
2535                 if (cmd == ipehr)
2536                         break;
2537
2538                 head -= 4;
2539         }
2540
2541         if (!i)
2542                 return NULL;
2543
2544         *seqno = ioread32(ring->virtual_start + head + 4) + 1;
2545         return &dev_priv->ring[(ring->id + (((ipehr >> 17) & 1) + 1)) % 3];
2546 }
2547
2548 static int semaphore_passed(struct intel_ring_buffer *ring)
2549 {
2550         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2551         struct intel_ring_buffer *signaller;
2552         u32 seqno, ctl;
2553
2554         ring->hangcheck.deadlock = true;
2555
2556         signaller = semaphore_waits_for(ring, &seqno);
2557         if (signaller == NULL || signaller->hangcheck.deadlock)
2558                 return -1;
2559
2560         /* cursory check for an unkickable deadlock */
2561         ctl = I915_READ_CTL(signaller);
2562         if (ctl & RING_WAIT_SEMAPHORE && semaphore_passed(signaller) < 0)
2563                 return -1;
2564
2565         return i915_seqno_passed(signaller->get_seqno(signaller, false), seqno);
2566 }
2567
2568 static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
2569 {
2570         struct intel_ring_buffer *ring;
2571         int i;
2572
2573         for_each_ring(ring, dev_priv, i)
2574                 ring->hangcheck.deadlock = false;
2575 }
2576
2577 static enum intel_ring_hangcheck_action
2578 ring_stuck(struct intel_ring_buffer *ring, u64 acthd)
2579 {
2580         struct drm_device *dev = ring->dev;
2581         struct drm_i915_private *dev_priv = dev->dev_private;
2582         u32 tmp;
2583
2584         if (ring->hangcheck.acthd != acthd)
2585                 return HANGCHECK_ACTIVE;
2586
2587         if (IS_GEN2(dev))
2588                 return HANGCHECK_HUNG;
2589
2590         /* Is the chip hanging on a WAIT_FOR_EVENT?
2591          * If so we can simply poke the RB_WAIT bit
2592          * and break the hang. This should work on
2593          * all but the second generation chipsets.
2594          */
2595         tmp = I915_READ_CTL(ring);
2596         if (tmp & RING_WAIT) {
2597                 i915_handle_error(dev, false,
2598                                   "Kicking stuck wait on %s",
2599                                   ring->name);
2600                 I915_WRITE_CTL(ring, tmp);
2601                 return HANGCHECK_KICK;
2602         }
2603
2604         if (INTEL_INFO(dev)->gen >= 6 && tmp & RING_WAIT_SEMAPHORE) {
2605                 switch (semaphore_passed(ring)) {
2606                 default:
2607                         return HANGCHECK_HUNG;
2608                 case 1:
2609                         i915_handle_error(dev, false,
2610                                           "Kicking stuck semaphore on %s",
2611                                           ring->name);
2612                         I915_WRITE_CTL(ring, tmp);
2613                         return HANGCHECK_KICK;
2614                 case 0:
2615                         return HANGCHECK_WAIT;
2616                 }
2617         }
2618
2619         return HANGCHECK_HUNG;
2620 }
2621
2622 /**
2623  * This is called when the chip hasn't reported back with completed
2624  * batchbuffers in a long time. We keep track per ring seqno progress and
2625  * if there are no progress, hangcheck score for that ring is increased.
2626  * Further, acthd is inspected to see if the ring is stuck. On stuck case
2627  * we kick the ring. If we see no progress on three subsequent calls
2628  * we assume chip is wedged and try to fix it by resetting the chip.
2629  */
2630 static void i915_hangcheck_elapsed(unsigned long data)
2631 {
2632         struct drm_device *dev = (struct drm_device *)data;
2633         struct drm_i915_private *dev_priv = dev->dev_private;
2634         struct intel_ring_buffer *ring;
2635         int i;
2636         int busy_count = 0, rings_hung = 0;
2637         bool stuck[I915_NUM_RINGS] = { 0 };
2638 #define BUSY 1
2639 #define KICK 5
2640 #define HUNG 20
2641
2642         if (!i915.enable_hangcheck)
2643                 return;
2644
2645         for_each_ring(ring, dev_priv, i) {
2646                 u64 acthd;
2647                 u32 seqno;
2648                 bool busy = true;
2649
2650                 semaphore_clear_deadlocks(dev_priv);
2651
2652                 seqno = ring->get_seqno(ring, false);
2653                 acthd = intel_ring_get_active_head(ring);
2654
2655                 if (ring->hangcheck.seqno == seqno) {
2656                         if (ring_idle(ring, seqno)) {
2657                                 ring->hangcheck.action = HANGCHECK_IDLE;
2658
2659                                 if (waitqueue_active(&ring->irq_queue)) {
2660                                         /* Issue a wake-up to catch stuck h/w. */
2661                                         if (!test_and_set_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings)) {
2662                                                 if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(ring)))
2663                                                         DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
2664                                                                   ring->name);
2665                                                 else
2666                                                         DRM_INFO("Fake missed irq on %s\n",
2667                                                                  ring->name);
2668                                                 wake_up_all(&ring->irq_queue);
2669                                         }
2670                                         /* Safeguard against driver failure */
2671                                         ring->hangcheck.score += BUSY;
2672                                 } else
2673                                         busy = false;
2674                         } else {
2675                                 /* We always increment the hangcheck score
2676                                  * if the ring is busy and still processing
2677                                  * the same request, so that no single request
2678                                  * can run indefinitely (such as a chain of
2679                                  * batches). The only time we do not increment
2680                                  * the hangcheck score on this ring, if this
2681                                  * ring is in a legitimate wait for another
2682                                  * ring. In that case the waiting ring is a
2683                                  * victim and we want to be sure we catch the
2684                                  * right culprit. Then every time we do kick
2685                                  * the ring, add a small increment to the
2686                                  * score so that we can catch a batch that is
2687                                  * being repeatedly kicked and so responsible
2688                                  * for stalling the machine.
2689                                  */
2690                                 ring->hangcheck.action = ring_stuck(ring,
2691                                                                     acthd);
2692
2693                                 switch (ring->hangcheck.action) {
2694                                 case HANGCHECK_IDLE:
2695                                 case HANGCHECK_WAIT:
2696                                         break;
2697                                 case HANGCHECK_ACTIVE:
2698                                         ring->hangcheck.score += BUSY;
2699                                         break;
2700                                 case HANGCHECK_KICK:
2701                                         ring->hangcheck.score += KICK;
2702                                         break;
2703                                 case HANGCHECK_HUNG:
2704                                         ring->hangcheck.score += HUNG;
2705                                         stuck[i] = true;
2706                                         break;
2707                                 }
2708                         }
2709                 } else {
2710                         ring->hangcheck.action = HANGCHECK_ACTIVE;
2711
2712                         /* Gradually reduce the count so that we catch DoS
2713                          * attempts across multiple batches.
2714                          */
2715                         if (ring->hangcheck.score > 0)
2716                                 ring->hangcheck.score--;
2717                 }
2718
2719                 ring->hangcheck.seqno = seqno;
2720                 ring->hangcheck.acthd = acthd;
2721                 busy_count += busy;
2722         }
2723
2724         for_each_ring(ring, dev_priv, i) {
2725                 if (ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG) {
2726                         DRM_INFO("%s on %s\n",
2727                                  stuck[i] ? "stuck" : "no progress",
2728                                  ring->name);
2729                         rings_hung++;
2730                 }
2731         }
2732
2733         if (rings_hung)
2734                 return i915_handle_error(dev, true, "Ring hung");
2735
2736         if (busy_count)
2737                 /* Reset timer case chip hangs without another request
2738                  * being added */
2739                 i915_queue_hangcheck(dev);
2740 }
2741
2742 void i915_queue_hangcheck(struct drm_device *dev)
2743 {
2744         struct drm_i915_private *dev_priv = dev->dev_private;
2745         if (!i915.enable_hangcheck)
2746                 return;
2747
2748         mod_timer(&dev_priv->gpu_error.hangcheck_timer,
2749                   round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES));
2750 }
2751
2752 static void ibx_irq_preinstall(struct drm_device *dev)
2753 {
2754         struct drm_i915_private *dev_priv = dev->dev_private;
2755
2756         if (HAS_PCH_NOP(dev))
2757                 return;
2758
2759         /* south display irq */
2760         I915_WRITE(SDEIMR, 0xffffffff);
2761         /*
2762          * SDEIER is also touched by the interrupt handler to work around missed
2763          * PCH interrupts. Hence we can't update it after the interrupt handler
2764          * is enabled - instead we unconditionally enable all PCH interrupt
2765          * sources here, but then only unmask them as needed with SDEIMR.
2766          */
2767         I915_WRITE(SDEIER, 0xffffffff);
2768         POSTING_READ(SDEIER);
2769 }
2770
2771 static void gen5_gt_irq_preinstall(struct drm_device *dev)
2772 {
2773         struct drm_i915_private *dev_priv = dev->dev_private;
2774
2775         /* and GT */
2776         I915_WRITE(GTIMR, 0xffffffff);
2777         I915_WRITE(GTIER, 0x0);
2778         POSTING_READ(GTIER);
2779
2780         if (INTEL_INFO(dev)->gen >= 6) {
2781                 /* and PM */
2782                 I915_WRITE(GEN6_PMIMR, 0xffffffff);
2783                 I915_WRITE(GEN6_PMIER, 0x0);
2784                 POSTING_READ(GEN6_PMIER);
2785         }
2786 }
2787
2788 /* drm_dma.h hooks
2789 */
2790 static void ironlake_irq_preinstall(struct drm_device *dev)
2791 {
2792         struct drm_i915_private *dev_priv = dev->dev_private;
2793
2794         I915_WRITE(HWSTAM, 0xeffe);
2795
2796         I915_WRITE(DEIMR, 0xffffffff);
2797         I915_WRITE(DEIER, 0x0);
2798         POSTING_READ(DEIER);
2799
2800         gen5_gt_irq_preinstall(dev);
2801
2802         ibx_irq_preinstall(dev);
2803 }
2804
2805 static void valleyview_irq_preinstall(struct drm_device *dev)
2806 {
2807         struct drm_i915_private *dev_priv = dev->dev_private;
2808         int pipe;
2809
2810         /* VLV magic */
2811         I915_WRITE(VLV_IMR, 0);
2812         I915_WRITE(RING_IMR(RENDER_RING_BASE), 0);
2813         I915_WRITE(RING_IMR(GEN6_BSD_RING_BASE), 0);
2814         I915_WRITE(RING_IMR(BLT_RING_BASE), 0);
2815
2816         /* and GT */
2817         I915_WRITE(GTIIR, I915_READ(GTIIR));
2818         I915_WRITE(GTIIR, I915_READ(GTIIR));
2819
2820         gen5_gt_irq_preinstall(dev);
2821
2822         I915_WRITE(DPINVGTT, 0xff);
2823
2824         I915_WRITE(PORT_HOTPLUG_EN, 0);
2825         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2826         for_each_pipe(pipe)
2827                 I915_WRITE(PIPESTAT(pipe), 0xffff);
2828         I915_WRITE(VLV_IIR, 0xffffffff);
2829         I915_WRITE(VLV_IMR, 0xffffffff);
2830         I915_WRITE(VLV_IER, 0x0);
2831         POSTING_READ(VLV_IER);
2832 }
2833
2834 static void gen8_irq_preinstall(struct drm_device *dev)
2835 {
2836         struct drm_i915_private *dev_priv = dev->dev_private;
2837         int pipe;
2838
2839         I915_WRITE(GEN8_MASTER_IRQ, 0);
2840         POSTING_READ(GEN8_MASTER_IRQ);
2841
2842         /* IIR can theoretically queue up two events. Be paranoid */
2843 #define GEN8_IRQ_INIT_NDX(type, which) do { \
2844                 I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
2845                 POSTING_READ(GEN8_##type##_IMR(which)); \
2846                 I915_WRITE(GEN8_##type##_IER(which), 0); \
2847                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
2848                 POSTING_READ(GEN8_##type##_IIR(which)); \
2849                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
2850         } while (0)
2851
2852 #define GEN8_IRQ_INIT(type) do { \
2853                 I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
2854                 POSTING_READ(GEN8_##type##_IMR); \
2855                 I915_WRITE(GEN8_##type##_IER, 0); \
2856                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
2857                 POSTING_READ(GEN8_##type##_IIR); \
2858                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
2859         } while (0)
2860
2861         GEN8_IRQ_INIT_NDX(GT, 0);
2862         GEN8_IRQ_INIT_NDX(GT, 1);
2863         GEN8_IRQ_INIT_NDX(GT, 2);
2864         GEN8_IRQ_INIT_NDX(GT, 3);
2865
2866         for_each_pipe(pipe) {
2867                 GEN8_IRQ_INIT_NDX(DE_PIPE, pipe);
2868         }
2869
2870         GEN8_IRQ_INIT(DE_PORT);
2871         GEN8_IRQ_INIT(DE_MISC);
2872         GEN8_IRQ_INIT(PCU);
2873 #undef GEN8_IRQ_INIT
2874 #undef GEN8_IRQ_INIT_NDX
2875
2876         POSTING_READ(GEN8_PCU_IIR);
2877
2878         ibx_irq_preinstall(dev);
2879 }
2880
2881 static void ibx_hpd_irq_setup(struct drm_device *dev)
2882 {
2883         struct drm_i915_private *dev_priv = dev->dev_private;
2884         struct drm_mode_config *mode_config = &dev->mode_config;
2885         struct intel_encoder *intel_encoder;
2886         u32 hotplug_irqs, hotplug, enabled_irqs = 0;
2887
2888         if (HAS_PCH_IBX(dev)) {
2889                 hotplug_irqs = SDE_HOTPLUG_MASK;
2890                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2891                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2892                                 enabled_irqs |= hpd_ibx[intel_encoder->hpd_pin];
2893         } else {
2894                 hotplug_irqs = SDE_HOTPLUG_MASK_CPT;
2895                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2896                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2897                                 enabled_irqs |= hpd_cpt[intel_encoder->hpd_pin];
2898         }
2899
2900         ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
2901
2902         /*
2903          * Enable digital hotplug on the PCH, and configure the DP short pulse
2904          * duration to 2ms (which is the minimum in the Display Port spec)
2905          *
2906          * This register is the same on all known PCH chips.
2907          */
2908         hotplug = I915_READ(PCH_PORT_HOTPLUG);
2909         hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
2910         hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
2911         hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
2912         hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
2913         I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
2914 }
2915
2916 static void ibx_irq_postinstall(struct drm_device *dev)
2917 {
2918         struct drm_i915_private *dev_priv = dev->dev_private;
2919         u32 mask;
2920
2921         if (HAS_PCH_NOP(dev))
2922                 return;
2923
2924         if (HAS_PCH_IBX(dev)) {
2925                 mask = SDE_GMBUS | SDE_AUX_MASK | SDE_POISON;
2926         } else {
2927                 mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT;
2928
2929                 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
2930         }
2931
2932         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
2933         I915_WRITE(SDEIMR, ~mask);
2934 }
2935
2936 static void gen5_gt_irq_postinstall(struct drm_device *dev)
2937 {
2938         struct drm_i915_private *dev_priv = dev->dev_private;
2939         u32 pm_irqs, gt_irqs;
2940
2941         pm_irqs = gt_irqs = 0;
2942
2943         dev_priv->gt_irq_mask = ~0;
2944         if (HAS_L3_DPF(dev)) {
2945                 /* L3 parity interrupt is always unmasked. */
2946                 dev_priv->gt_irq_mask = ~GT_PARITY_ERROR(dev);
2947                 gt_irqs |= GT_PARITY_ERROR(dev);
2948         }
2949
2950         gt_irqs |= GT_RENDER_USER_INTERRUPT;
2951         if (IS_GEN5(dev)) {
2952                 gt_irqs |= GT_RENDER_PIPECTL_NOTIFY_INTERRUPT |
2953                            ILK_BSD_USER_INTERRUPT;
2954         } else {
2955                 gt_irqs |= GT_BLT_USER_INTERRUPT | GT_BSD_USER_INTERRUPT;
2956         }
2957
2958         I915_WRITE(GTIIR, I915_READ(GTIIR));
2959         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
2960         I915_WRITE(GTIER, gt_irqs);
2961         POSTING_READ(GTIER);
2962
2963         if (INTEL_INFO(dev)->gen >= 6) {
2964                 pm_irqs |= dev_priv->pm_rps_events;
2965
2966                 if (HAS_VEBOX(dev))
2967                         pm_irqs |= PM_VEBOX_USER_INTERRUPT;
2968
2969                 dev_priv->pm_irq_mask = 0xffffffff;
2970                 I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
2971                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_irq_mask);
2972                 I915_WRITE(GEN6_PMIER, pm_irqs);
2973                 POSTING_READ(GEN6_PMIER);
2974         }
2975 }
2976
2977 static int ironlake_irq_postinstall(struct drm_device *dev)
2978 {
2979         unsigned long irqflags;
2980         struct drm_i915_private *dev_priv = dev->dev_private;
2981         u32 display_mask, extra_mask;
2982
2983         if (INTEL_INFO(dev)->gen >= 7) {
2984                 display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE_IVB |
2985                                 DE_PCH_EVENT_IVB | DE_PLANEC_FLIP_DONE_IVB |
2986                                 DE_PLANEB_FLIP_DONE_IVB |
2987                                 DE_PLANEA_FLIP_DONE_IVB | DE_AUX_CHANNEL_A_IVB);
2988                 extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB |
2989                               DE_PIPEA_VBLANK_IVB | DE_ERR_INT_IVB);
2990
2991                 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
2992         } else {
2993                 display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
2994                                 DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
2995                                 DE_AUX_CHANNEL_A |
2996                                 DE_PIPEB_CRC_DONE | DE_PIPEA_CRC_DONE |
2997                                 DE_POISON);
2998                 extra_mask = DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT |
2999                                 DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN;
3000         }
3001
3002         dev_priv->irq_mask = ~display_mask;
3003
3004         /* should always can generate irq */
3005         I915_WRITE(DEIIR, I915_READ(DEIIR));
3006         I915_WRITE(DEIMR, dev_priv->irq_mask);
3007         I915_WRITE(DEIER, display_mask | extra_mask);
3008         POSTING_READ(DEIER);
3009
3010         gen5_gt_irq_postinstall(dev);
3011
3012         ibx_irq_postinstall(dev);
3013
3014         if (IS_IRONLAKE_M(dev)) {
3015                 /* Enable PCU event interrupts
3016                  *
3017                  * spinlocking not required here for correctness since interrupt
3018                  * setup is guaranteed to run in single-threaded context. But we
3019                  * need it to make the assert_spin_locked happy. */
3020                 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3021                 ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);
3022                 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3023         }
3024
3025         return 0;
3026 }
3027
3028 static void valleyview_display_irqs_install(struct drm_i915_private *dev_priv)
3029 {
3030         u32 pipestat_mask;
3031         u32 iir_mask;
3032
3033         pipestat_mask = PIPESTAT_INT_STATUS_MASK |
3034                         PIPE_FIFO_UNDERRUN_STATUS;
3035
3036         I915_WRITE(PIPESTAT(PIPE_A), pipestat_mask);
3037         I915_WRITE(PIPESTAT(PIPE_B), pipestat_mask);
3038         POSTING_READ(PIPESTAT(PIPE_A));
3039
3040         pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
3041                         PIPE_CRC_DONE_INTERRUPT_STATUS;
3042
3043         i915_enable_pipestat(dev_priv, PIPE_A, pipestat_mask |
3044                                                PIPE_GMBUS_INTERRUPT_STATUS);
3045         i915_enable_pipestat(dev_priv, PIPE_B, pipestat_mask);
3046
3047         iir_mask = I915_DISPLAY_PORT_INTERRUPT |
3048                    I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3049                    I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
3050         dev_priv->irq_mask &= ~iir_mask;
3051
3052         I915_WRITE(VLV_IIR, iir_mask);
3053         I915_WRITE(VLV_IIR, iir_mask);
3054         I915_WRITE(VLV_IMR, dev_priv->irq_mask);
3055         I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
3056         POSTING_READ(VLV_IER);
3057 }
3058
3059 static void valleyview_display_irqs_uninstall(struct drm_i915_private *dev_priv)
3060 {
3061         u32 pipestat_mask;
3062         u32 iir_mask;
3063
3064         iir_mask = I915_DISPLAY_PORT_INTERRUPT |
3065                    I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3066                    I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
3067
3068         dev_priv->irq_mask |= iir_mask;
3069         I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
3070         I915_WRITE(VLV_IMR, dev_priv->irq_mask);
3071         I915_WRITE(VLV_IIR, iir_mask);
3072         I915_WRITE(VLV_IIR, iir_mask);
3073         POSTING_READ(VLV_IIR);
3074
3075         pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
3076                         PIPE_CRC_DONE_INTERRUPT_STATUS;
3077
3078         i915_disable_pipestat(dev_priv, PIPE_A, pipestat_mask |
3079                                                 PIPE_GMBUS_INTERRUPT_STATUS);
3080         i915_disable_pipestat(dev_priv, PIPE_B, pipestat_mask);
3081
3082         pipestat_mask = PIPESTAT_INT_STATUS_MASK |
3083                         PIPE_FIFO_UNDERRUN_STATUS;
3084         I915_WRITE(PIPESTAT(PIPE_A), pipestat_mask);
3085         I915_WRITE(PIPESTAT(PIPE_B), pipestat_mask);
3086         POSTING_READ(PIPESTAT(PIPE_A));
3087 }
3088
3089 void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv)
3090 {
3091         assert_spin_locked(&dev_priv->irq_lock);
3092
3093         if (dev_priv->display_irqs_enabled)
3094                 return;
3095
3096         dev_priv->display_irqs_enabled = true;
3097
3098         if (dev_priv->dev->irq_enabled)
3099                 valleyview_display_irqs_install(dev_priv);
3100 }
3101
3102 void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv)
3103 {
3104         assert_spin_locked(&dev_priv->irq_lock);
3105
3106         if (!dev_priv->display_irqs_enabled)
3107                 return;
3108
3109         dev_priv->display_irqs_enabled = false;
3110
3111         if (dev_priv->dev->irq_enabled)
3112                 valleyview_display_irqs_uninstall(dev_priv);
3113 }
3114
3115 static int valleyview_irq_postinstall(struct drm_device *dev)
3116 {
3117         struct drm_i915_private *dev_priv = dev->dev_private;
3118         unsigned long irqflags;
3119
3120         dev_priv->irq_mask = ~0;
3121
3122         I915_WRITE(PORT_HOTPLUG_EN, 0);
3123         POSTING_READ(PORT_HOTPLUG_EN);
3124
3125         I915_WRITE(VLV_IMR, dev_priv->irq_mask);
3126         I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
3127         I915_WRITE(VLV_IIR, 0xffffffff);
3128         POSTING_READ(VLV_IER);
3129
3130         /* Interrupt setup is already guaranteed to be single-threaded, this is
3131          * just to make the assert_spin_locked check happy. */
3132         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3133         if (dev_priv->display_irqs_enabled)
3134                 valleyview_display_irqs_install(dev_priv);
3135         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3136
3137         I915_WRITE(VLV_IIR, 0xffffffff);
3138         I915_WRITE(VLV_IIR, 0xffffffff);
3139
3140         gen5_gt_irq_postinstall(dev);
3141
3142         /* ack & enable invalid PTE error interrupts */
3143 #if 0 /* FIXME: add support to irq handler for checking these bits */
3144         I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK);
3145         I915_WRITE(DPINVGTT, DPINVGTT_EN_MASK);
3146 #endif
3147
3148         I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
3149
3150         return 0;
3151 }
3152
3153 static void gen8_gt_irq_postinstall(struct drm_i915_private *dev_priv)
3154 {
3155         int i;
3156
3157         /* These are interrupts we'll toggle with the ring mask register */
3158         uint32_t gt_interrupts[] = {
3159                 GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT |
3160                         GT_RENDER_L3_PARITY_ERROR_INTERRUPT |
3161                         GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT,
3162                 GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT |
3163                         GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT,
3164                 0,
3165                 GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT
3166                 };
3167
3168         for (i = 0; i < ARRAY_SIZE(gt_interrupts); i++) {
3169                 u32 tmp = I915_READ(GEN8_GT_IIR(i));
3170                 if (tmp)
3171                         DRM_ERROR("Interrupt (%d) should have been masked in pre-install 0x%08x\n",
3172                                   i, tmp);
3173                 I915_WRITE(GEN8_GT_IMR(i), ~gt_interrupts[i]);
3174                 I915_WRITE(GEN8_GT_IER(i), gt_interrupts[i]);
3175         }
3176         POSTING_READ(GEN8_GT_IER(0));
3177 }
3178
3179 static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
3180 {
3181         struct drm_device *dev = dev_priv->dev;
3182         uint32_t de_pipe_masked = GEN8_PIPE_FLIP_DONE |
3183                 GEN8_PIPE_CDCLK_CRC_DONE |
3184                 GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
3185         uint32_t de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
3186                 GEN8_PIPE_FIFO_UNDERRUN;
3187         int pipe;
3188         dev_priv->de_irq_mask[PIPE_A] = ~de_pipe_masked;
3189         dev_priv->de_irq_mask[PIPE_B] = ~de_pipe_masked;
3190         dev_priv->de_irq_mask[PIPE_C] = ~de_pipe_masked;
3191
3192         for_each_pipe(pipe) {
3193                 u32 tmp = I915_READ(GEN8_DE_PIPE_IIR(pipe));
3194                 if (tmp)
3195                         DRM_ERROR("Interrupt (%d) should have been masked in pre-install 0x%08x\n",
3196                                   pipe, tmp);
3197                 I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
3198                 I915_WRITE(GEN8_DE_PIPE_IER(pipe), de_pipe_enables);
3199         }
3200         POSTING_READ(GEN8_DE_PIPE_ISR(0));
3201
3202         I915_WRITE(GEN8_DE_PORT_IMR, ~GEN8_AUX_CHANNEL_A);
3203         I915_WRITE(GEN8_DE_PORT_IER, GEN8_AUX_CHANNEL_A);
3204         POSTING_READ(GEN8_DE_PORT_IER);
3205 }
3206
3207 static int gen8_irq_postinstall(struct drm_device *dev)
3208 {
3209         struct drm_i915_private *dev_priv = dev->dev_private;
3210
3211         gen8_gt_irq_postinstall(dev_priv);
3212         gen8_de_irq_postinstall(dev_priv);
3213
3214         ibx_irq_postinstall(dev);
3215
3216         I915_WRITE(GEN8_MASTER_IRQ, DE_MASTER_IRQ_CONTROL);
3217         POSTING_READ(GEN8_MASTER_IRQ);
3218
3219         return 0;
3220 }
3221
3222 static void gen8_irq_uninstall(struct drm_device *dev)
3223 {
3224         struct drm_i915_private *dev_priv = dev->dev_private;
3225         int pipe;
3226
3227         if (!dev_priv)
3228                 return;
3229
3230         I915_WRITE(GEN8_MASTER_IRQ, 0);
3231
3232 #define GEN8_IRQ_FINI_NDX(type, which) do { \
3233                 I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
3234                 I915_WRITE(GEN8_##type##_IER(which), 0); \
3235                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
3236         } while (0)
3237
3238 #define GEN8_IRQ_FINI(type) do { \
3239                 I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
3240                 I915_WRITE(GEN8_##type##_IER, 0); \
3241                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
3242         } while (0)
3243
3244         GEN8_IRQ_FINI_NDX(GT, 0);
3245         GEN8_IRQ_FINI_NDX(GT, 1);
3246         GEN8_IRQ_FINI_NDX(GT, 2);
3247         GEN8_IRQ_FINI_NDX(GT, 3);
3248
3249         for_each_pipe(pipe) {
3250                 GEN8_IRQ_FINI_NDX(DE_PIPE, pipe);
3251         }
3252
3253         GEN8_IRQ_FINI(DE_PORT);
3254         GEN8_IRQ_FINI(DE_MISC);
3255         GEN8_IRQ_FINI(PCU);
3256 #undef GEN8_IRQ_FINI
3257 #undef GEN8_IRQ_FINI_NDX
3258
3259         POSTING_READ(GEN8_PCU_IIR);
3260 }
3261
3262 static void valleyview_irq_uninstall(struct drm_device *dev)
3263 {
3264         struct drm_i915_private *dev_priv = dev->dev_private;
3265         unsigned long irqflags;
3266         int pipe;
3267
3268         if (!dev_priv)
3269                 return;
3270
3271         intel_hpd_irq_uninstall(dev_priv);
3272
3273         for_each_pipe(pipe)
3274                 I915_WRITE(PIPESTAT(pipe), 0xffff);
3275
3276         I915_WRITE(HWSTAM, 0xffffffff);
3277         I915_WRITE(PORT_HOTPLUG_EN, 0);
3278         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3279
3280         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3281         if (dev_priv->display_irqs_enabled)
3282                 valleyview_display_irqs_uninstall(dev_priv);
3283         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3284
3285         dev_priv->irq_mask = 0;
3286
3287         I915_WRITE(VLV_IIR, 0xffffffff);
3288         I915_WRITE(VLV_IMR, 0xffffffff);
3289         I915_WRITE(VLV_IER, 0x0);
3290         POSTING_READ(VLV_IER);
3291 }
3292
3293 static void ironlake_irq_uninstall(struct drm_device *dev)
3294 {
3295         struct drm_i915_private *dev_priv = dev->dev_private;
3296
3297         if (!dev_priv)
3298                 return;
3299
3300         intel_hpd_irq_uninstall(dev_priv);
3301
3302         I915_WRITE(HWSTAM, 0xffffffff);
3303
3304         I915_WRITE(DEIMR, 0xffffffff);
3305         I915_WRITE(DEIER, 0x0);
3306         I915_WRITE(DEIIR, I915_READ(DEIIR));
3307         if (IS_GEN7(dev))
3308                 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
3309
3310         I915_WRITE(GTIMR, 0xffffffff);
3311         I915_WRITE(GTIER, 0x0);
3312         I915_WRITE(GTIIR, I915_READ(GTIIR));
3313
3314         if (HAS_PCH_NOP(dev))
3315                 return;
3316
3317         I915_WRITE(SDEIMR, 0xffffffff);
3318         I915_WRITE(SDEIER, 0x0);
3319         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
3320         if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
3321                 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
3322 }
3323
3324 static void i8xx_irq_preinstall(struct drm_device * dev)
3325 {
3326         struct drm_i915_private *dev_priv = dev->dev_private;
3327         int pipe;
3328
3329         for_each_pipe(pipe)
3330                 I915_WRITE(PIPESTAT(pipe), 0);
3331         I915_WRITE16(IMR, 0xffff);
3332         I915_WRITE16(IER, 0x0);
3333         POSTING_READ16(IER);
3334 }
3335
3336 static int i8xx_irq_postinstall(struct drm_device *dev)
3337 {
3338         struct drm_i915_private *dev_priv = dev->dev_private;
3339         unsigned long irqflags;
3340
3341         I915_WRITE16(EMR,
3342                      ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
3343
3344         /* Unmask the interrupts that we always want on. */
3345         dev_priv->irq_mask =
3346                 ~(I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3347                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3348                   I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3349                   I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3350                   I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3351         I915_WRITE16(IMR, dev_priv->irq_mask);
3352
3353         I915_WRITE16(IER,
3354                      I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3355                      I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3356                      I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
3357                      I915_USER_INTERRUPT);
3358         POSTING_READ16(IER);
3359
3360         /* Interrupt setup is already guaranteed to be single-threaded, this is
3361          * just to make the assert_spin_locked check happy. */
3362         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3363         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
3364         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
3365         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3366
3367         return 0;
3368 }
3369
3370 /*
3371  * Returns true when a page flip has completed.
3372  */
3373 static bool i8xx_handle_vblank(struct drm_device *dev,
3374                                int plane, int pipe, u32 iir)
3375 {
3376         struct drm_i915_private *dev_priv = dev->dev_private;
3377         u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
3378
3379         if (!drm_handle_vblank(dev, pipe))
3380                 return false;
3381
3382         if ((iir & flip_pending) == 0)
3383                 return false;
3384
3385         intel_prepare_page_flip(dev, plane);
3386
3387         /* We detect FlipDone by looking for the change in PendingFlip from '1'
3388          * to '0' on the following vblank, i.e. IIR has the Pendingflip
3389          * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
3390          * the flip is completed (no longer pending). Since this doesn't raise
3391          * an interrupt per se, we watch for the change at vblank.
3392          */
3393         if (I915_READ16(ISR) & flip_pending)
3394                 return false;
3395
3396         intel_finish_page_flip(dev, pipe);
3397
3398         return true;
3399 }
3400
3401 static irqreturn_t i8xx_irq_handler(int irq, void *arg)
3402 {
3403         struct drm_device *dev = (struct drm_device *) arg;
3404         struct drm_i915_private *dev_priv = dev->dev_private;
3405         u16 iir, new_iir;
3406         u32 pipe_stats[2];
3407         unsigned long irqflags;
3408         int pipe;
3409         u16 flip_mask =
3410                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3411                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3412
3413         iir = I915_READ16(IIR);
3414         if (iir == 0)
3415                 return IRQ_NONE;
3416
3417         while (iir & ~flip_mask) {
3418                 /* Can't rely on pipestat interrupt bit in iir as it might
3419                  * have been cleared after the pipestat interrupt was received.
3420                  * It doesn't set the bit in iir again, but it still produces
3421                  * interrupts (for non-MSI).
3422                  */
3423                 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3424                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3425                         i915_handle_error(dev, false,
3426                                           "Command parser error, iir 0x%08x",
3427                                           iir);
3428
3429                 for_each_pipe(pipe) {
3430                         int reg = PIPESTAT(pipe);
3431                         pipe_stats[pipe] = I915_READ(reg);
3432
3433                         /*
3434                          * Clear the PIPE*STAT regs before the IIR
3435                          */
3436                         if (pipe_stats[pipe] & 0x8000ffff)
3437                                 I915_WRITE(reg, pipe_stats[pipe]);
3438                 }
3439                 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3440
3441                 I915_WRITE16(IIR, iir & ~flip_mask);
3442                 new_iir = I915_READ16(IIR); /* Flush posted writes */
3443
3444                 i915_update_dri1_breadcrumb(dev);
3445
3446                 if (iir & I915_USER_INTERRUPT)
3447                         notify_ring(dev, &dev_priv->ring[RCS]);
3448
3449                 for_each_pipe(pipe) {
3450                         int plane = pipe;
3451                         if (HAS_FBC(dev))
3452                                 plane = !plane;
3453
3454                         if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
3455                             i8xx_handle_vblank(dev, plane, pipe, iir))
3456                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
3457
3458                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3459                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3460
3461                         if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS &&
3462                             intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
3463                                 DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
3464                 }
3465
3466                 iir = new_iir;
3467         }
3468
3469         return IRQ_HANDLED;
3470 }
3471
3472 static void i8xx_irq_uninstall(struct drm_device * dev)
3473 {
3474         struct drm_i915_private *dev_priv = dev->dev_private;
3475         int pipe;
3476
3477         for_each_pipe(pipe) {
3478                 /* Clear enable bits; then clear status bits */
3479                 I915_WRITE(PIPESTAT(pipe), 0);
3480                 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3481         }
3482         I915_WRITE16(IMR, 0xffff);
3483         I915_WRITE16(IER, 0x0);
3484         I915_WRITE16(IIR, I915_READ16(IIR));
3485 }
3486
3487 static void i915_irq_preinstall(struct drm_device * dev)
3488 {
3489         struct drm_i915_private *dev_priv = dev->dev_private;
3490         int pipe;
3491
3492         if (I915_HAS_HOTPLUG(dev)) {
3493                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3494                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3495         }
3496
3497         I915_WRITE16(HWSTAM, 0xeffe);
3498         for_each_pipe(pipe)
3499                 I915_WRITE(PIPESTAT(pipe), 0);
3500         I915_WRITE(IMR, 0xffffffff);
3501         I915_WRITE(IER, 0x0);
3502         POSTING_READ(IER);
3503 }
3504
3505 static int i915_irq_postinstall(struct drm_device *dev)
3506 {
3507         struct drm_i915_private *dev_priv = dev->dev_private;
3508         u32 enable_mask;
3509         unsigned long irqflags;
3510
3511         I915_WRITE(EMR, ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
3512
3513         /* Unmask the interrupts that we always want on. */
3514         dev_priv->irq_mask =
3515                 ~(I915_ASLE_INTERRUPT |
3516                   I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3517                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3518                   I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3519                   I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3520                   I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3521
3522         enable_mask =
3523                 I915_ASLE_INTERRUPT |
3524                 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3525                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3526                 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
3527                 I915_USER_INTERRUPT;
3528
3529         if (I915_HAS_HOTPLUG(dev)) {
3530                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3531                 POSTING_READ(PORT_HOTPLUG_EN);
3532
3533                 /* Enable in IER... */
3534                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
3535                 /* and unmask in IMR */
3536                 dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
3537         }
3538
3539         I915_WRITE(IMR, dev_priv->irq_mask);
3540         I915_WRITE(IER, enable_mask);
3541         POSTING_READ(IER);
3542
3543         i915_enable_asle_pipestat(dev);
3544
3545         /* Interrupt setup is already guaranteed to be single-threaded, this is
3546          * just to make the assert_spin_locked check happy. */
3547         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3548         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
3549         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
3550         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3551
3552         return 0;
3553 }
3554
3555 /*
3556  * Returns true when a page flip has completed.
3557  */
3558 static bool i915_handle_vblank(struct drm_device *dev,
3559                                int plane, int pipe, u32 iir)
3560 {
3561         struct drm_i915_private *dev_priv = dev->dev_private;
3562         u32 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
3563
3564         if (!drm_handle_vblank(dev, pipe))
3565                 return false;
3566
3567         if ((iir & flip_pending) == 0)
3568                 return false;
3569
3570         intel_prepare_page_flip(dev, plane);
3571
3572         /* We detect FlipDone by looking for the change in PendingFlip from '1'
3573          * to '0' on the following vblank, i.e. IIR has the Pendingflip
3574          * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
3575          * the flip is completed (no longer pending). Since this doesn't raise
3576          * an interrupt per se, we watch for the change at vblank.
3577          */
3578         if (I915_READ(ISR) & flip_pending)
3579                 return false;
3580
3581         intel_finish_page_flip(dev, pipe);
3582
3583         return true;
3584 }
3585
3586 static irqreturn_t i915_irq_handler(int irq, void *arg)
3587 {
3588         struct drm_device *dev = (struct drm_device *) arg;
3589         struct drm_i915_private *dev_priv = dev->dev_private;
3590         u32 iir, new_iir, pipe_stats[I915_MAX_PIPES];
3591         unsigned long irqflags;
3592         u32 flip_mask =
3593                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3594                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3595         int pipe, ret = IRQ_NONE;
3596
3597         iir = I915_READ(IIR);
3598         do {
3599                 bool irq_received = (iir & ~flip_mask) != 0;
3600                 bool blc_event = false;
3601
3602                 /* Can't rely on pipestat interrupt bit in iir as it might
3603                  * have been cleared after the pipestat interrupt was received.
3604                  * It doesn't set the bit in iir again, but it still produces
3605                  * interrupts (for non-MSI).
3606                  */
3607                 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3608                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3609                         i915_handle_error(dev, false,
3610                                           "Command parser error, iir 0x%08x",
3611                                           iir);
3612
3613                 for_each_pipe(pipe) {
3614                         int reg = PIPESTAT(pipe);
3615                         pipe_stats[pipe] = I915_READ(reg);
3616
3617                         /* Clear the PIPE*STAT regs before the IIR */
3618                         if (pipe_stats[pipe] & 0x8000ffff) {
3619                                 I915_WRITE(reg, pipe_stats[pipe]);
3620                                 irq_received = true;
3621                         }
3622                 }
3623                 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3624
3625                 if (!irq_received)
3626                         break;
3627
3628                 /* Consume port.  Then clear IIR or we'll miss events */
3629                 if ((I915_HAS_HOTPLUG(dev)) &&
3630                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
3631                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3632                         u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
3633
3634                         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
3635
3636                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3637                         POSTING_READ(PORT_HOTPLUG_STAT);
3638                 }
3639
3640                 I915_WRITE(IIR, iir & ~flip_mask);
3641                 new_iir = I915_READ(IIR); /* Flush posted writes */
3642
3643                 if (iir & I915_USER_INTERRUPT)
3644                         notify_ring(dev, &dev_priv->ring[RCS]);
3645
3646                 for_each_pipe(pipe) {
3647                         int plane = pipe;
3648                         if (HAS_FBC(dev))
3649                                 plane = !plane;
3650
3651                         if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
3652                             i915_handle_vblank(dev, plane, pipe, iir))
3653                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
3654
3655                         if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3656                                 blc_event = true;
3657
3658                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3659                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3660
3661                         if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS &&
3662                             intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
3663                                 DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
3664                 }
3665
3666                 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3667                         intel_opregion_asle_intr(dev);
3668
3669                 /* With MSI, interrupts are only generated when iir
3670                  * transitions from zero to nonzero.  If another bit got
3671                  * set while we were handling the existing iir bits, then
3672                  * we would never get another interrupt.
3673                  *
3674                  * This is fine on non-MSI as well, as if we hit this path
3675                  * we avoid exiting the interrupt handler only to generate
3676                  * another one.
3677                  *
3678                  * Note that for MSI this could cause a stray interrupt report
3679                  * if an interrupt landed in the time between writing IIR and
3680                  * the posting read.  This should be rare enough to never
3681                  * trigger the 99% of 100,000 interrupts test for disabling
3682                  * stray interrupts.
3683                  */
3684                 ret = IRQ_HANDLED;
3685                 iir = new_iir;
3686         } while (iir & ~flip_mask);
3687
3688         i915_update_dri1_breadcrumb(dev);
3689
3690         return ret;
3691 }
3692
3693 static void i915_irq_uninstall(struct drm_device * dev)
3694 {
3695         struct drm_i915_private *dev_priv = dev->dev_private;
3696         int pipe;
3697
3698         intel_hpd_irq_uninstall(dev_priv);
3699
3700         if (I915_HAS_HOTPLUG(dev)) {
3701                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3702                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3703         }
3704
3705         I915_WRITE16(HWSTAM, 0xffff);
3706         for_each_pipe(pipe) {
3707                 /* Clear enable bits; then clear status bits */
3708                 I915_WRITE(PIPESTAT(pipe), 0);
3709                 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3710         }
3711         I915_WRITE(IMR, 0xffffffff);
3712         I915_WRITE(IER, 0x0);
3713
3714         I915_WRITE(IIR, I915_READ(IIR));
3715 }
3716
3717 static void i965_irq_preinstall(struct drm_device * dev)
3718 {
3719         struct drm_i915_private *dev_priv = dev->dev_private;
3720         int pipe;
3721
3722         I915_WRITE(PORT_HOTPLUG_EN, 0);
3723         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3724
3725         I915_WRITE(HWSTAM, 0xeffe);
3726         for_each_pipe(pipe)
3727                 I915_WRITE(PIPESTAT(pipe), 0);
3728         I915_WRITE(IMR, 0xffffffff);
3729         I915_WRITE(IER, 0x0);
3730         POSTING_READ(IER);
3731 }
3732
3733 static int i965_irq_postinstall(struct drm_device *dev)
3734 {
3735         struct drm_i915_private *dev_priv = dev->dev_private;
3736         u32 enable_mask;
3737         u32 error_mask;
3738         unsigned long irqflags;
3739
3740         /* Unmask the interrupts that we always want on. */
3741         dev_priv->irq_mask = ~(I915_ASLE_INTERRUPT |
3742                                I915_DISPLAY_PORT_INTERRUPT |
3743                                I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3744                                I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3745                                I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3746                                I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3747                                I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3748
3749         enable_mask = ~dev_priv->irq_mask;
3750         enable_mask &= ~(I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3751                          I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT);
3752         enable_mask |= I915_USER_INTERRUPT;
3753
3754         if (IS_G4X(dev))
3755                 enable_mask |= I915_BSD_USER_INTERRUPT;
3756
3757         /* Interrupt setup is already guaranteed to be single-threaded, this is
3758          * just to make the assert_spin_locked check happy. */
3759         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3760         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS);
3761         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
3762         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
3763         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3764
3765         /*
3766          * Enable some error detection, note the instruction error mask
3767          * bit is reserved, so we leave it masked.
3768          */
3769         if (IS_G4X(dev)) {
3770                 error_mask = ~(GM45_ERROR_PAGE_TABLE |
3771                                GM45_ERROR_MEM_PRIV |
3772                                GM45_ERROR_CP_PRIV |
3773                                I915_ERROR_MEMORY_REFRESH);
3774         } else {
3775                 error_mask = ~(I915_ERROR_PAGE_TABLE |
3776                                I915_ERROR_MEMORY_REFRESH);
3777         }
3778         I915_WRITE(EMR, error_mask);
3779
3780         I915_WRITE(IMR, dev_priv->irq_mask);
3781         I915_WRITE(IER, enable_mask);
3782         POSTING_READ(IER);
3783
3784         I915_WRITE(PORT_HOTPLUG_EN, 0);
3785         POSTING_READ(PORT_HOTPLUG_EN);
3786
3787         i915_enable_asle_pipestat(dev);
3788
3789         return 0;
3790 }
3791
3792 static void i915_hpd_irq_setup(struct drm_device *dev)
3793 {
3794         struct drm_i915_private *dev_priv = dev->dev_private;
3795         struct drm_mode_config *mode_config = &dev->mode_config;
3796         struct intel_encoder *intel_encoder;
3797         u32 hotplug_en;
3798
3799         assert_spin_locked(&dev_priv->irq_lock);
3800
3801         if (I915_HAS_HOTPLUG(dev)) {
3802                 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
3803                 hotplug_en &= ~HOTPLUG_INT_EN_MASK;
3804                 /* Note HDMI and DP share hotplug bits */
3805                 /* enable bits are the same for all generations */
3806                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
3807                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
3808                                 hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin];
3809                 /* Programming the CRT detection parameters tends
3810                    to generate a spurious hotplug event about three
3811                    seconds later.  So just do it once.
3812                 */
3813                 if (IS_G4X(dev))
3814                         hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
3815                 hotplug_en &= ~CRT_HOTPLUG_VOLTAGE_COMPARE_MASK;
3816                 hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
3817
3818                 /* Ignore TV since it's buggy */
3819                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
3820         }
3821 }
3822
3823 static irqreturn_t i965_irq_handler(int irq, void *arg)
3824 {
3825         struct drm_device *dev = (struct drm_device *) arg;
3826         struct drm_i915_private *dev_priv = dev->dev_private;
3827         u32 iir, new_iir;
3828         u32 pipe_stats[I915_MAX_PIPES];
3829         unsigned long irqflags;
3830         int ret = IRQ_NONE, pipe;
3831         u32 flip_mask =
3832                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3833                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3834
3835         iir = I915_READ(IIR);
3836
3837         for (;;) {
3838                 bool irq_received = (iir & ~flip_mask) != 0;
3839                 bool blc_event = false;
3840
3841                 /* Can't rely on pipestat interrupt bit in iir as it might
3842                  * have been cleared after the pipestat interrupt was received.
3843                  * It doesn't set the bit in iir again, but it still produces
3844                  * interrupts (for non-MSI).
3845                  */
3846                 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3847                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3848                         i915_handle_error(dev, false,
3849                                           "Command parser error, iir 0x%08x",
3850                                           iir);
3851
3852                 for_each_pipe(pipe) {
3853                         int reg = PIPESTAT(pipe);
3854                         pipe_stats[pipe] = I915_READ(reg);
3855
3856                         /*
3857                          * Clear the PIPE*STAT regs before the IIR
3858                          */
3859                         if (pipe_stats[pipe] & 0x8000ffff) {
3860                                 I915_WRITE(reg, pipe_stats[pipe]);
3861                                 irq_received = true;
3862                         }
3863                 }
3864                 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3865
3866                 if (!irq_received)
3867                         break;
3868
3869                 ret = IRQ_HANDLED;
3870
3871                 /* Consume port.  Then clear IIR or we'll miss events */
3872                 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
3873                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3874                         u32 hotplug_trigger = hotplug_status & (IS_G4X(dev) ?
3875                                                                   HOTPLUG_INT_STATUS_G4X :
3876                                                                   HOTPLUG_INT_STATUS_I915);
3877
3878                         intel_hpd_irq_handler(dev, hotplug_trigger,
3879                                               IS_G4X(dev) ? hpd_status_g4x : hpd_status_i915);
3880
3881                         if (IS_G4X(dev) &&
3882                             (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X))
3883                                 dp_aux_irq_handler(dev);
3884
3885                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3886                         I915_READ(PORT_HOTPLUG_STAT);
3887                 }
3888
3889                 I915_WRITE(IIR, iir & ~flip_mask);
3890                 new_iir = I915_READ(IIR); /* Flush posted writes */
3891
3892                 if (iir & I915_USER_INTERRUPT)
3893                         notify_ring(dev, &dev_priv->ring[RCS]);
3894                 if (iir & I915_BSD_USER_INTERRUPT)
3895                         notify_ring(dev, &dev_priv->ring[VCS]);
3896
3897                 for_each_pipe(pipe) {
3898                         if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
3899                             i915_handle_vblank(dev, pipe, pipe, iir))
3900                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe);
3901
3902                         if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3903                                 blc_event = true;
3904
3905                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3906                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3907
3908                         if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS &&
3909                             intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
3910                                 DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
3911                 }
3912
3913                 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3914                         intel_opregion_asle_intr(dev);
3915
3916                 if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
3917                         gmbus_irq_handler(dev);
3918
3919                 /* With MSI, interrupts are only generated when iir
3920                  * transitions from zero to nonzero.  If another bit got
3921                  * set while we were handling the existing iir bits, then
3922                  * we would never get another interrupt.
3923                  *
3924                  * This is fine on non-MSI as well, as if we hit this path
3925                  * we avoid exiting the interrupt handler only to generate
3926                  * another one.
3927                  *
3928                  * Note that for MSI this could cause a stray interrupt report
3929                  * if an interrupt landed in the time between writing IIR and
3930                  * the posting read.  This should be rare enough to never
3931                  * trigger the 99% of 100,000 interrupts test for disabling
3932                  * stray interrupts.
3933                  */
3934                 iir = new_iir;
3935         }
3936
3937         i915_update_dri1_breadcrumb(dev);
3938
3939         return ret;
3940 }
3941
3942 static void i965_irq_uninstall(struct drm_device * dev)
3943 {
3944         struct drm_i915_private *dev_priv = dev->dev_private;
3945         int pipe;
3946
3947         if (!dev_priv)
3948                 return;
3949
3950         intel_hpd_irq_uninstall(dev_priv);
3951
3952         I915_WRITE(PORT_HOTPLUG_EN, 0);
3953         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3954
3955         I915_WRITE(HWSTAM, 0xffffffff);
3956         for_each_pipe(pipe)
3957                 I915_WRITE(PIPESTAT(pipe), 0);
3958         I915_WRITE(IMR, 0xffffffff);
3959         I915_WRITE(IER, 0x0);
3960
3961         for_each_pipe(pipe)
3962                 I915_WRITE(PIPESTAT(pipe),
3963                            I915_READ(PIPESTAT(pipe)) & 0x8000ffff);
3964         I915_WRITE(IIR, I915_READ(IIR));
3965 }
3966
3967 static void intel_hpd_irq_reenable(unsigned long data)
3968 {
3969         struct drm_i915_private *dev_priv = (struct drm_i915_private *)data;
3970         struct drm_device *dev = dev_priv->dev;
3971         struct drm_mode_config *mode_config = &dev->mode_config;
3972         unsigned long irqflags;
3973         int i;
3974
3975         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3976         for (i = (HPD_NONE + 1); i < HPD_NUM_PINS; i++) {
3977                 struct drm_connector *connector;
3978
3979                 if (dev_priv->hpd_stats[i].hpd_mark != HPD_DISABLED)
3980                         continue;
3981
3982                 dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED;
3983
3984                 list_for_each_entry(connector, &mode_config->connector_list, head) {
3985                         struct intel_connector *intel_connector = to_intel_connector(connector);
3986
3987                         if (intel_connector->encoder->hpd_pin == i) {
3988                                 if (connector->polled != intel_connector->polled)
3989                                         DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
3990                                                          drm_get_connector_name(connector));
3991                                 connector->polled = intel_connector->polled;
3992                                 if (!connector->polled)
3993                                         connector->polled = DRM_CONNECTOR_POLL_HPD;
3994                         }
3995                 }
3996         }
3997         if (dev_priv->display.hpd_irq_setup)
3998                 dev_priv->display.hpd_irq_setup(dev);
3999         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
4000 }
4001
4002 void intel_irq_init(struct drm_device *dev)
4003 {
4004         struct drm_i915_private *dev_priv = dev->dev_private;
4005
4006         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
4007         INIT_WORK(&dev_priv->gpu_error.work, i915_error_work_func);
4008         INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
4009         INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
4010
4011         /* Let's track the enabled rps events */
4012         dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS;
4013
4014         setup_timer(&dev_priv->gpu_error.hangcheck_timer,
4015                     i915_hangcheck_elapsed,
4016                     (unsigned long) dev);
4017         setup_timer(&dev_priv->hotplug_reenable_timer, intel_hpd_irq_reenable,
4018                     (unsigned long) dev_priv);
4019
4020         pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
4021
4022         if (IS_GEN2(dev)) {
4023                 dev->max_vblank_count = 0;
4024                 dev->driver->get_vblank_counter = i8xx_get_vblank_counter;
4025         } else if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
4026                 dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
4027                 dev->driver->get_vblank_counter = gm45_get_vblank_counter;
4028         } else {
4029                 dev->driver->get_vblank_counter = i915_get_vblank_counter;
4030                 dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
4031         }
4032
4033         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
4034                 dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
4035                 dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
4036         }
4037
4038         if (IS_VALLEYVIEW(dev)) {
4039                 dev->driver->irq_handler = valleyview_irq_handler;
4040                 dev->driver->irq_preinstall = valleyview_irq_preinstall;
4041                 dev->driver->irq_postinstall = valleyview_irq_postinstall;
4042                 dev->driver->irq_uninstall = valleyview_irq_uninstall;
4043                 dev->driver->enable_vblank = valleyview_enable_vblank;
4044                 dev->driver->disable_vblank = valleyview_disable_vblank;
4045                 dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
4046         } else if (IS_GEN8(dev)) {
4047                 dev->driver->irq_handler = gen8_irq_handler;
4048                 dev->driver->irq_preinstall = gen8_irq_preinstall;
4049                 dev->driver->irq_postinstall = gen8_irq_postinstall;
4050                 dev->driver->irq_uninstall = gen8_irq_uninstall;
4051                 dev->driver->enable_vblank = gen8_enable_vblank;
4052                 dev->driver->disable_vblank = gen8_disable_vblank;
4053                 dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
4054         } else if (HAS_PCH_SPLIT(dev)) {
4055                 dev->driver->irq_handler = ironlake_irq_handler;
4056                 dev->driver->irq_preinstall = ironlake_irq_preinstall;
4057                 dev->driver->irq_postinstall = ironlake_irq_postinstall;
4058                 dev->driver->irq_uninstall = ironlake_irq_uninstall;
4059                 dev->driver->enable_vblank = ironlake_enable_vblank;
4060                 dev->driver->disable_vblank = ironlake_disable_vblank;
4061                 dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
4062         } else {
4063                 if (INTEL_INFO(dev)->gen == 2) {
4064                         dev->driver->irq_preinstall = i8xx_irq_preinstall;
4065                         dev->driver->irq_postinstall = i8xx_irq_postinstall;
4066                         dev->driver->irq_handler = i8xx_irq_handler;
4067                         dev->driver->irq_uninstall = i8xx_irq_uninstall;
4068                 } else if (INTEL_INFO(dev)->gen == 3) {
4069                         dev->driver->irq_preinstall = i915_irq_preinstall;
4070                         dev->driver->irq_postinstall = i915_irq_postinstall;
4071                         dev->driver->irq_uninstall = i915_irq_uninstall;
4072                         dev->driver->irq_handler = i915_irq_handler;
4073                         dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
4074                 } else {
4075                         dev->driver->irq_preinstall = i965_irq_preinstall;
4076                         dev->driver->irq_postinstall = i965_irq_postinstall;
4077                         dev->driver->irq_uninstall = i965_irq_uninstall;
4078                         dev->driver->irq_handler = i965_irq_handler;
4079                         dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
4080                 }
4081                 dev->driver->enable_vblank = i915_enable_vblank;
4082                 dev->driver->disable_vblank = i915_disable_vblank;
4083         }
4084 }
4085
4086 void intel_hpd_init(struct drm_device *dev)
4087 {
4088         struct drm_i915_private *dev_priv = dev->dev_private;
4089         struct drm_mode_config *mode_config = &dev->mode_config;
4090         struct drm_connector *connector;
4091         unsigned long irqflags;
4092         int i;
4093
4094         for (i = 1; i < HPD_NUM_PINS; i++) {
4095                 dev_priv->hpd_stats[i].hpd_cnt = 0;
4096                 dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED;
4097         }
4098         list_for_each_entry(connector, &mode_config->connector_list, head) {
4099                 struct intel_connector *intel_connector = to_intel_connector(connector);
4100                 connector->polled = intel_connector->polled;
4101                 if (!connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
4102                         connector->polled = DRM_CONNECTOR_POLL_HPD;
4103         }
4104
4105         /* Interrupt setup is already guaranteed to be single-threaded, this is
4106          * just to make the assert_spin_locked checks happy. */
4107         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
4108         if (dev_priv->display.hpd_irq_setup)
4109                 dev_priv->display.hpd_irq_setup(dev);
4110         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
4111 }
4112
4113 /* Disable interrupts so we can allow runtime PM. */
4114 void hsw_runtime_pm_disable_interrupts(struct drm_device *dev)
4115 {
4116         struct drm_i915_private *dev_priv = dev->dev_private;
4117         unsigned long irqflags;
4118
4119         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
4120
4121         dev_priv->pm.regsave.deimr = I915_READ(DEIMR);
4122         dev_priv->pm.regsave.sdeimr = I915_READ(SDEIMR);
4123         dev_priv->pm.regsave.gtimr = I915_READ(GTIMR);
4124         dev_priv->pm.regsave.gtier = I915_READ(GTIER);
4125         dev_priv->pm.regsave.gen6_pmimr = I915_READ(GEN6_PMIMR);
4126
4127         ironlake_disable_display_irq(dev_priv, 0xffffffff);
4128         ibx_disable_display_interrupt(dev_priv, 0xffffffff);
4129         ilk_disable_gt_irq(dev_priv, 0xffffffff);
4130         snb_disable_pm_irq(dev_priv, 0xffffffff);
4131
4132         dev_priv->pm.irqs_disabled = true;
4133
4134         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
4135 }
4136
4137 /* Restore interrupts so we can recover from runtime PM. */
4138 void hsw_runtime_pm_restore_interrupts(struct drm_device *dev)
4139 {
4140         struct drm_i915_private *dev_priv = dev->dev_private;
4141         unsigned long irqflags;
4142         uint32_t val;
4143
4144         spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
4145
4146         val = I915_READ(DEIMR);
4147         WARN(val != 0xffffffff, "DEIMR is 0x%08x\n", val);
4148
4149         val = I915_READ(SDEIMR);
4150         WARN(val != 0xffffffff, "SDEIMR is 0x%08x\n", val);
4151
4152         val = I915_READ(GTIMR);
4153         WARN(val != 0xffffffff, "GTIMR is 0x%08x\n", val);
4154
4155         val = I915_READ(GEN6_PMIMR);
4156         WARN(val != 0xffffffff, "GEN6_PMIMR is 0x%08x\n", val);
4157
4158         dev_priv->pm.irqs_disabled = false;
4159
4160         ironlake_enable_display_irq(dev_priv, ~dev_priv->pm.regsave.deimr);
4161         ibx_enable_display_interrupt(dev_priv, ~dev_priv->pm.regsave.sdeimr);
4162         ilk_enable_gt_irq(dev_priv, ~dev_priv->pm.regsave.gtimr);
4163         snb_enable_pm_irq(dev_priv, ~dev_priv->pm.regsave.gen6_pmimr);
4164         I915_WRITE(GTIER, dev_priv->pm.regsave.gtier);
4165
4166         spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
4167 }