773b7c4ab9771e8518ccc7b015a704b034557032
[dragonfly.git] / sys / dev / drm / i915 / i915_irq.c
1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
2  */
3 /*
4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5  * All Rights Reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the
9  * "Software"), to deal in the Software without restriction, including
10  * without limitation the rights to use, copy, modify, merge, publish,
11  * distribute, sub license, and/or sell copies of the Software, and to
12  * permit persons to whom the Software is furnished to do so, subject to
13  * the following conditions:
14  *
15  * The above copyright notice and this permission notice (including the
16  * next paragraph) shall be included in all copies or substantial portions
17  * of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  *
27  */
28
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31 #include "i915_drv.h"
32 #include "i915_trace.h"
33 #include "intel_drv.h"
34
35 static const u32 hpd_ibx[] = {
36         [HPD_CRT] = SDE_CRT_HOTPLUG,
37         [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
38         [HPD_PORT_B] = SDE_PORTB_HOTPLUG,
39         [HPD_PORT_C] = SDE_PORTC_HOTPLUG,
40         [HPD_PORT_D] = SDE_PORTD_HOTPLUG
41 };
42
43 static const u32 hpd_cpt[] = {
44         [HPD_CRT] = SDE_CRT_HOTPLUG_CPT,
45         [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG_CPT,
46         [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
47         [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
48         [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT
49 };
50
51 static const u32 hpd_mask_i915[] = {
52         [HPD_CRT] = CRT_HOTPLUG_INT_EN,
53         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_EN,
54         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_EN,
55         [HPD_PORT_B] = PORTB_HOTPLUG_INT_EN,
56         [HPD_PORT_C] = PORTC_HOTPLUG_INT_EN,
57         [HPD_PORT_D] = PORTD_HOTPLUG_INT_EN
58 };
59
60 static const u32 hpd_status_g4x[] = {
61         [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
62         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_G4X,
63         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_G4X,
64         [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
65         [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
66         [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
67 };
68
69 static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
70         [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
71         [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915,
72         [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I915,
73         [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
74         [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
75         [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
76 };
77
78 /* For display hotplug interrupt */
79 static void
80 ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
81 {
82         assert_spin_locked(&dev_priv->irq_lock);
83
84         if (dev_priv->pc8.irqs_disabled) {
85                 WARN(1, "IRQs disabled\n");
86                 dev_priv->pc8.regsave.deimr &= ~mask;
87                 return;
88         }
89
90         if ((dev_priv->irq_mask & mask) != 0) {
91                 dev_priv->irq_mask &= ~mask;
92                 I915_WRITE(DEIMR, dev_priv->irq_mask);
93                 POSTING_READ(DEIMR);
94         }
95 }
96
97 static void
98 ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
99 {
100         assert_spin_locked(&dev_priv->irq_lock);
101
102         if (dev_priv->pc8.irqs_disabled) {
103                 WARN(1, "IRQs disabled\n");
104                 dev_priv->pc8.regsave.deimr |= mask;
105                 return;
106         }
107
108         if ((dev_priv->irq_mask & mask) != mask) {
109                 dev_priv->irq_mask |= mask;
110                 I915_WRITE(DEIMR, dev_priv->irq_mask);
111                 POSTING_READ(DEIMR);
112         }
113 }
114
115 /**
116  * ilk_update_gt_irq - update GTIMR
117  * @dev_priv: driver private
118  * @interrupt_mask: mask of interrupt bits to update
119  * @enabled_irq_mask: mask of interrupt bits to enable
120  */
121 static void ilk_update_gt_irq(struct drm_i915_private *dev_priv,
122                               uint32_t interrupt_mask,
123                               uint32_t enabled_irq_mask)
124 {
125         assert_spin_locked(&dev_priv->irq_lock);
126
127         if (dev_priv->pc8.irqs_disabled) {
128                 WARN(1, "IRQs disabled\n");
129                 dev_priv->pc8.regsave.gtimr &= ~interrupt_mask;
130                 dev_priv->pc8.regsave.gtimr |= (~enabled_irq_mask &
131                                                 interrupt_mask);
132                 return;
133         }
134
135         dev_priv->gt_irq_mask &= ~interrupt_mask;
136         dev_priv->gt_irq_mask |= (~enabled_irq_mask & interrupt_mask);
137         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
138         POSTING_READ(GTIMR);
139 }
140
141 void ilk_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
142 {
143         ilk_update_gt_irq(dev_priv, mask, mask);
144 }
145
146 void ilk_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
147 {
148         ilk_update_gt_irq(dev_priv, mask, 0);
149 }
150
151 /**
152   * snb_update_pm_irq - update GEN6_PMIMR
153   * @dev_priv: driver private
154   * @interrupt_mask: mask of interrupt bits to update
155   * @enabled_irq_mask: mask of interrupt bits to enable
156   */
157 static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
158                               uint32_t interrupt_mask,
159                               uint32_t enabled_irq_mask)
160 {
161         uint32_t new_val;
162
163         assert_spin_locked(&dev_priv->irq_lock);
164
165         if (dev_priv->pc8.irqs_disabled) {
166                 WARN(1, "IRQs disabled\n");
167                 dev_priv->pc8.regsave.gen6_pmimr &= ~interrupt_mask;
168                 dev_priv->pc8.regsave.gen6_pmimr |= (~enabled_irq_mask &
169                                                      interrupt_mask);
170                 return;
171         }
172
173         new_val = dev_priv->pm_irq_mask;
174         new_val &= ~interrupt_mask;
175         new_val |= (~enabled_irq_mask & interrupt_mask);
176
177         if (new_val != dev_priv->pm_irq_mask) {
178                 dev_priv->pm_irq_mask = new_val;
179                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_irq_mask);
180                 POSTING_READ(GEN6_PMIMR);
181         }
182 }
183
184 void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
185 {
186         snb_update_pm_irq(dev_priv, mask, mask);
187 }
188
189 void snb_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
190 {
191         snb_update_pm_irq(dev_priv, mask, 0);
192 }
193
194 static bool ivb_can_enable_err_int(struct drm_device *dev)
195 {
196         struct drm_i915_private *dev_priv = dev->dev_private;
197         struct intel_crtc *crtc;
198         enum i915_pipe pipe;
199
200         assert_spin_locked(&dev_priv->irq_lock);
201
202         for_each_pipe(pipe) {
203                 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
204
205                 if (crtc->cpu_fifo_underrun_disabled)
206                         return false;
207         }
208
209         return true;
210 }
211
212 static bool cpt_can_enable_serr_int(struct drm_device *dev)
213 {
214         struct drm_i915_private *dev_priv = dev->dev_private;
215         enum i915_pipe pipe;
216         struct intel_crtc *crtc;
217
218         assert_spin_locked(&dev_priv->irq_lock);
219
220         for_each_pipe(pipe) {
221                 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
222
223                 if (crtc->pch_fifo_underrun_disabled)
224                         return false;
225         }
226
227         return true;
228 }
229
230 static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,
231                                                  enum i915_pipe pipe, bool enable)
232 {
233         struct drm_i915_private *dev_priv = dev->dev_private;
234         uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :
235                                           DE_PIPEB_FIFO_UNDERRUN;
236
237         if (enable)
238                 ironlake_enable_display_irq(dev_priv, bit);
239         else
240                 ironlake_disable_display_irq(dev_priv, bit);
241 }
242
243 static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
244                                                   enum i915_pipe pipe, bool enable)
245 {
246         struct drm_i915_private *dev_priv = dev->dev_private;
247         if (enable) {
248                 I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));
249
250                 if (!ivb_can_enable_err_int(dev))
251                         return;
252
253                 ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);
254         } else {
255                 bool was_enabled = !(I915_READ(DEIMR) & DE_ERR_INT_IVB);
256
257                 /* Change the state _after_ we've read out the current one. */
258                 ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);
259
260                 if (!was_enabled &&
261                     (I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe))) {
262                         DRM_DEBUG_KMS("uncleared fifo underrun on pipe %c\n",
263                                       pipe_name(pipe));
264                 }
265         }
266 }
267
268 static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,
269                                                   enum i915_pipe pipe, bool enable)
270 {
271         struct drm_i915_private *dev_priv = dev->dev_private;
272
273         assert_spin_locked(&dev_priv->irq_lock);
274
275         if (enable)
276                 dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_FIFO_UNDERRUN;
277         else
278                 dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_FIFO_UNDERRUN;
279         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
280         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
281 }
282
283 /**
284  * ibx_display_interrupt_update - update SDEIMR
285  * @dev_priv: driver private
286  * @interrupt_mask: mask of interrupt bits to update
287  * @enabled_irq_mask: mask of interrupt bits to enable
288  */
289 static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
290                                          uint32_t interrupt_mask,
291                                          uint32_t enabled_irq_mask)
292 {
293         uint32_t sdeimr = I915_READ(SDEIMR);
294         sdeimr &= ~interrupt_mask;
295         sdeimr |= (~enabled_irq_mask & interrupt_mask);
296
297         assert_spin_locked(&dev_priv->irq_lock);
298
299         if (dev_priv->pc8.irqs_disabled &&
300             (interrupt_mask & SDE_HOTPLUG_MASK_CPT)) {
301                 WARN(1, "IRQs disabled\n");
302                 dev_priv->pc8.regsave.sdeimr &= ~interrupt_mask;
303                 dev_priv->pc8.regsave.sdeimr |= (~enabled_irq_mask &
304                                                  interrupt_mask);
305                 return;
306         }
307
308         I915_WRITE(SDEIMR, sdeimr);
309         POSTING_READ(SDEIMR);
310 }
311 #define ibx_enable_display_interrupt(dev_priv, bits) \
312         ibx_display_interrupt_update((dev_priv), (bits), (bits))
313 #define ibx_disable_display_interrupt(dev_priv, bits) \
314         ibx_display_interrupt_update((dev_priv), (bits), 0)
315
316 static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
317                                             enum transcoder pch_transcoder,
318                                             bool enable)
319 {
320         struct drm_i915_private *dev_priv = dev->dev_private;
321         uint32_t bit = (pch_transcoder == TRANSCODER_A) ?
322                        SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;
323
324         if (enable)
325                 ibx_enable_display_interrupt(dev_priv, bit);
326         else
327                 ibx_disable_display_interrupt(dev_priv, bit);
328 }
329
330 static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
331                                             enum transcoder pch_transcoder,
332                                             bool enable)
333 {
334         struct drm_i915_private *dev_priv = dev->dev_private;
335
336         if (enable) {
337                 I915_WRITE(SERR_INT,
338                            SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));
339
340                 if (!cpt_can_enable_serr_int(dev))
341                         return;
342
343                 ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);
344         } else {
345                 uint32_t tmp = I915_READ(SERR_INT);
346                 bool was_enabled = !(I915_READ(SDEIMR) & SDE_ERROR_CPT);
347
348                 /* Change the state _after_ we've read out the current one. */
349                 ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);
350
351                 if (!was_enabled &&
352                     (tmp & SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder))) {
353                         DRM_DEBUG_KMS("uncleared pch fifo underrun on pch transcoder %c\n",
354                                       transcoder_name(pch_transcoder));
355                 }
356         }
357 }
358
359 /**
360  * intel_set_cpu_fifo_underrun_reporting - enable/disable FIFO underrun messages
361  * @dev: drm device
362  * @pipe: pipe
363  * @enable: true if we want to report FIFO underrun errors, false otherwise
364  *
365  * This function makes us disable or enable CPU fifo underruns for a specific
366  * pipe. Notice that on some Gens (e.g. IVB, HSW), disabling FIFO underrun
367  * reporting for one pipe may also disable all the other CPU error interruts for
368  * the other pipes, due to the fact that there's just one interrupt mask/enable
369  * bit for all the pipes.
370  *
371  * Returns the previous state of underrun reporting.
372  */
373 bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
374                                            enum i915_pipe pipe, bool enable)
375 {
376         struct drm_i915_private *dev_priv = dev->dev_private;
377         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
378         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
379         bool ret;
380
381         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
382
383         ret = !intel_crtc->cpu_fifo_underrun_disabled;
384
385         if (enable == ret)
386                 goto done;
387
388         intel_crtc->cpu_fifo_underrun_disabled = !enable;
389
390         if (IS_GEN5(dev) || IS_GEN6(dev))
391                 ironlake_set_fifo_underrun_reporting(dev, pipe, enable);
392         else if (IS_GEN7(dev))
393                 ivybridge_set_fifo_underrun_reporting(dev, pipe, enable);
394         else if (IS_GEN8(dev))
395                 broadwell_set_fifo_underrun_reporting(dev, pipe, enable);
396
397 done:
398         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
399         return ret;
400 }
401
402 /**
403  * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages
404  * @dev: drm device
405  * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)
406  * @enable: true if we want to report FIFO underrun errors, false otherwise
407  *
408  * This function makes us disable or enable PCH fifo underruns for a specific
409  * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO
410  * underrun reporting for one transcoder may also disable all the other PCH
411  * error interruts for the other transcoders, due to the fact that there's just
412  * one interrupt mask/enable bit for all the transcoders.
413  *
414  * Returns the previous state of underrun reporting.
415  */
416 bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,
417                                            enum transcoder pch_transcoder,
418                                            bool enable)
419 {
420         struct drm_i915_private *dev_priv = dev->dev_private;
421         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];
422         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
423         bool ret;
424
425         /*
426          * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT
427          * has only one pch transcoder A that all pipes can use. To avoid racy
428          * pch transcoder -> pipe lookups from interrupt code simply store the
429          * underrun statistics in crtc A. Since we never expose this anywhere
430          * nor use it outside of the fifo underrun code here using the "wrong"
431          * crtc on LPT won't cause issues.
432          */
433
434         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
435
436         ret = !intel_crtc->pch_fifo_underrun_disabled;
437
438         if (enable == ret)
439                 goto done;
440
441         intel_crtc->pch_fifo_underrun_disabled = !enable;
442
443         if (HAS_PCH_IBX(dev))
444                 ibx_set_fifo_underrun_reporting(dev, pch_transcoder, enable);
445         else
446                 cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable);
447
448 done:
449         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
450         return ret;
451 }
452
453
454 void
455 i915_enable_pipestat(drm_i915_private_t *dev_priv, enum i915_pipe pipe, u32 mask)
456 {
457         u32 reg = PIPESTAT(pipe);
458         u32 pipestat = I915_READ(reg) & 0x7fff0000;
459
460         assert_spin_locked(&dev_priv->irq_lock);
461
462         if ((pipestat & mask) == mask)
463                 return;
464
465         /* Enable the interrupt, clear any pending status */
466         pipestat |= mask | (mask >> 16);
467         I915_WRITE(reg, pipestat);
468         POSTING_READ(reg);
469 }
470
471 void
472 i915_disable_pipestat(drm_i915_private_t *dev_priv, enum i915_pipe pipe, u32 mask)
473 {
474         u32 reg = PIPESTAT(pipe);
475         u32 pipestat = I915_READ(reg) & 0x7fff0000;
476
477         assert_spin_locked(&dev_priv->irq_lock);
478
479         if ((pipestat & mask) == 0)
480                 return;
481
482         pipestat &= ~mask;
483         I915_WRITE(reg, pipestat);
484         POSTING_READ(reg);
485 }
486
487 /**
488  * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion
489  */
490 static void i915_enable_asle_pipestat(struct drm_device *dev)
491 {
492         drm_i915_private_t *dev_priv = dev->dev_private;
493
494         if (!dev_priv->opregion.asle || !IS_MOBILE(dev))
495                 return;
496
497         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
498
499         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_LEGACY_BLC_EVENT_ENABLE);
500         if (INTEL_INFO(dev)->gen >= 4)
501                 i915_enable_pipestat(dev_priv, PIPE_A,
502                                      PIPE_LEGACY_BLC_EVENT_ENABLE);
503
504         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
505 }
506
507 /**
508  * i915_pipe_enabled - check if a pipe is enabled
509  * @dev: DRM device
510  * @pipe: pipe to check
511  *
512  * Reading certain registers when the pipe is disabled can hang the chip.
513  * Use this routine to make sure the PLL is running and the pipe is active
514  * before reading such registers if unsure.
515  */
516 static int
517 i915_pipe_enabled(struct drm_device *dev, int pipe)
518 {
519         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
520
521         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
522                 /* Locking is horribly broken here, but whatever. */
523                 struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
524                 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
525
526                 return intel_crtc->active;
527         } else {
528                 return I915_READ(PIPECONF(pipe)) & PIPECONF_ENABLE;
529         }
530 }
531
532 static u32 i8xx_get_vblank_counter(struct drm_device *dev, int pipe)
533 {
534         /* Gen2 doesn't have a hardware frame counter */
535         return 0;
536 }
537
538 /* Called from drm generic code, passed a 'crtc', which
539  * we use as a pipe index
540  */
541 static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
542 {
543         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
544         unsigned long high_frame;
545         unsigned long low_frame;
546         u32 high1, high2, low, pixel, vbl_start;
547
548         if (!i915_pipe_enabled(dev, pipe)) {
549                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
550                                 "pipe %c\n", pipe_name(pipe));
551                 return 0;
552         }
553
554         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
555                 struct intel_crtc *intel_crtc =
556                         to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
557                 const struct drm_display_mode *mode =
558                         &intel_crtc->config.adjusted_mode;
559
560                 vbl_start = mode->crtc_vblank_start * mode->crtc_htotal;
561         } else {
562                 enum transcoder cpu_transcoder = (enum transcoder) pipe;
563                 u32 htotal;
564
565                 htotal = ((I915_READ(HTOTAL(cpu_transcoder)) >> 16) & 0x1fff) + 1;
566                 vbl_start = (I915_READ(VBLANK(cpu_transcoder)) & 0x1fff) + 1;
567
568                 vbl_start *= htotal;
569         }
570
571         high_frame = PIPEFRAME(pipe);
572         low_frame = PIPEFRAMEPIXEL(pipe);
573
574         /*
575          * High & low register fields aren't synchronized, so make sure
576          * we get a low value that's stable across two reads of the high
577          * register.
578          */
579         do {
580                 high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
581                 low   = I915_READ(low_frame);
582                 high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
583         } while (high1 != high2);
584
585         high1 >>= PIPE_FRAME_HIGH_SHIFT;
586         pixel = low & PIPE_PIXEL_MASK;
587         low >>= PIPE_FRAME_LOW_SHIFT;
588
589         /*
590          * The frame counter increments at beginning of active.
591          * Cook up a vblank counter by also checking the pixel
592          * counter against vblank start.
593          */
594         return (((high1 << 8) | low) + (pixel >= vbl_start)) & 0xffffff;
595 }
596
597 static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
598 {
599         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
600         int reg = PIPE_FRMCOUNT_GM45(pipe);
601
602         if (!i915_pipe_enabled(dev, pipe)) {
603                 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
604                                  "pipe %c\n", pipe_name(pipe));
605                 return 0;
606         }
607
608         return I915_READ(reg);
609 }
610
611 /* raw reads, only for fast reads of display block, no need for forcewake etc. */
612 #define __raw_i915_read32(dev_priv__, reg__) DRM_READ32(dev_priv__->mmio_map, reg__)
613
614 static bool ilk_pipe_in_vblank_locked(struct drm_device *dev, enum i915_pipe pipe)
615 {
616         struct drm_i915_private *dev_priv = dev->dev_private;
617         uint32_t status;
618         int reg;
619
620         if (INTEL_INFO(dev)->gen >= 8) {
621                 status = GEN8_PIPE_VBLANK;
622                 reg = GEN8_DE_PIPE_ISR(pipe);
623         } else if (INTEL_INFO(dev)->gen >= 7) {
624                 status = DE_PIPE_VBLANK_IVB(pipe);
625                 reg = DEISR;
626         } else {
627                 status = DE_PIPE_VBLANK(pipe);
628                 reg = DEISR;
629         }
630
631         return __raw_i915_read32(dev_priv, reg) & status;
632 }
633
634 static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
635                              int *vpos, int *hpos)
636 {
637         struct drm_i915_private *dev_priv = dev->dev_private;
638         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
639         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
640         const struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode;
641         int position;
642         int vbl_start, vbl_end, htotal, vtotal;
643         bool in_vbl = true;
644         int ret = 0;
645
646         if (!intel_crtc->active) {
647                 DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
648                                  "pipe %c\n", pipe_name(pipe));
649                 return 0;
650         }
651
652         htotal = mode->crtc_htotal;
653         vtotal = mode->crtc_vtotal;
654         vbl_start = mode->crtc_vblank_start;
655         vbl_end = mode->crtc_vblank_end;
656
657         if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
658                 vbl_start = DIV_ROUND_UP(vbl_start, 2);
659                 vbl_end /= 2;
660                 vtotal /= 2;
661         }
662
663         ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
664
665         /*
666          * Lock uncore.lock, as we will do multiple timing critical raw
667          * register reads, potentially with preemption disabled, so the
668          * following code must not block on uncore.lock.
669          */
670         lockmgr(&dev_priv->uncore.lock, LK_EXCLUSIVE);
671         
672         /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
673
674         /* Get optional system timestamp before query. */
675 #if 0
676         if (stime)
677                 *stime = ktime_get();
678 #endif
679
680         if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
681                 /* No obvious pixelcount register. Only query vertical
682                  * scanout position from Display scan line register.
683                  */
684                 if (IS_GEN2(dev))
685                         position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN2;
686                 else
687                         position = __raw_i915_read32(dev_priv, PIPEDSL(pipe)) & DSL_LINEMASK_GEN3;
688
689                 if (HAS_DDI(dev)) {
690                         /*
691                          * On HSW HDMI outputs there seems to be a 2 line
692                          * difference, whereas eDP has the normal 1 line
693                          * difference that earlier platforms have. External
694                          * DP is unknown. For now just check for the 2 line
695                          * difference case on all output types on HSW+.
696                          *
697                          * This might misinterpret the scanline counter being
698                          * one line too far along on eDP, but that's less
699                          * dangerous than the alternative since that would lead
700                          * the vblank timestamp code astray when it sees a
701                          * scanline count before vblank_start during a vblank
702                          * interrupt.
703                          */
704                         in_vbl = ilk_pipe_in_vblank_locked(dev, pipe);
705                         if ((in_vbl && (position == vbl_start - 2 ||
706                                         position == vbl_start - 1)) ||
707                             (!in_vbl && (position == vbl_end - 2 ||
708                                          position == vbl_end - 1)))
709                                 position = (position + 2) % vtotal;
710                 } else if (HAS_PCH_SPLIT(dev)) {
711                         /*
712                          * The scanline counter increments at the leading edge
713                          * of hsync, ie. it completely misses the active portion
714                          * of the line. Fix up the counter at both edges of vblank
715                          * to get a more accurate picture whether we're in vblank
716                          * or not.
717                          */
718                         in_vbl = ilk_pipe_in_vblank_locked(dev, pipe);
719                         if ((in_vbl && position == vbl_start - 1) ||
720                             (!in_vbl && position == vbl_end - 1))
721                                 position = (position + 1) % vtotal;
722                 } else {
723                         /*
724                          * ISR vblank status bits don't work the way we'd want
725                          * them to work on non-PCH platforms (for
726                          * ilk_pipe_in_vblank_locked()), and there doesn't
727                          * appear any other way to determine if we're currently
728                          * in vblank.
729                          *
730                          * Instead let's assume that we're already in vblank if
731                          * we got called from the vblank interrupt and the
732                          * scanline counter value indicates that we're on the
733                          * line just prior to vblank start. This should result
734                          * in the correct answer, unless the vblank interrupt
735                          * delivery really got delayed for almost exactly one
736                          * full frame/field.
737                          */
738 #if 0
739                         if (flags & DRM_CALLED_FROM_VBLIRQ &&
740                             position == vbl_start - 1) {
741                                 position = (position + 1) % vtotal;
742
743                                 /* Signal this correction as "applied". */
744                                 ret |= 0x8;
745                         }
746 #endif
747                 }
748         } else {
749                 /* Have access to pixelcount since start of frame.
750                  * We can split this into vertical and horizontal
751                  * scanout position.
752                  */
753                 position = (__raw_i915_read32(dev_priv, PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
754
755                 /* convert to pixel counts */
756                 vbl_start *= htotal;
757                 vbl_end *= htotal;
758                 vtotal *= htotal;
759         }
760
761         /* Get optional system timestamp after query. */
762 #if 0
763         if (etime)
764                 *etime = ktime_get();
765 #endif
766
767         /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
768
769         lockmgr(&dev_priv->uncore.lock, LK_RELEASE);
770
771         in_vbl = position >= vbl_start && position < vbl_end;
772
773         /*
774          * While in vblank, position will be negative
775          * counting up towards 0 at vbl_end. And outside
776          * vblank, position will be positive counting
777          * up since vbl_end.
778          */
779         if (position >= vbl_start)
780                 position -= vbl_end;
781         else
782                 position += vtotal - vbl_end;
783
784         if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
785                 *vpos = position;
786                 *hpos = 0;
787         } else {
788                 *vpos = position / htotal;
789                 *hpos = position - (*vpos * htotal);
790         }
791
792         /* In vblank? */
793         if (in_vbl)
794                 ret |= DRM_SCANOUTPOS_INVBL;
795
796         return ret;
797 }
798
799 static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
800                               int *max_error,
801                               struct timeval *vblank_time,
802                               unsigned flags)
803 {
804         struct drm_crtc *crtc;
805
806         if (pipe < 0 || pipe >= INTEL_INFO(dev)->num_pipes) {
807                 DRM_ERROR("Invalid crtc %d\n", pipe);
808                 return -EINVAL;
809         }
810
811         /* Get drm_crtc to timestamp: */
812         crtc = intel_get_crtc_for_pipe(dev, pipe);
813         if (crtc == NULL) {
814                 DRM_ERROR("Invalid crtc %d\n", pipe);
815                 return -EINVAL;
816         }
817
818         if (!crtc->enabled) {
819                 DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
820                 return -EBUSY;
821         }
822
823         /* Helper routine in DRM core does all the work: */
824         return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
825                                                      vblank_time, flags,
826                                                      crtc);
827 }
828
829 static bool intel_hpd_irq_event(struct drm_device *dev,
830                                 struct drm_connector *connector)
831 {
832         enum drm_connector_status old_status;
833
834         WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
835         old_status = connector->status;
836
837         connector->status = connector->funcs->detect(connector, false);
838         if (old_status == connector->status)
839                 return false;
840
841         DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
842                       connector->base.id,
843                       drm_get_connector_name(connector),
844                       drm_get_connector_status_name(old_status),
845                       drm_get_connector_status_name(connector->status));
846
847         return true;
848 }
849
850 /*
851  * Handle hotplug events outside the interrupt handler proper.
852  */
853 #define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
854
855 static void i915_hotplug_work_func(struct work_struct *work)
856 {
857         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
858                                                     hotplug_work);
859         struct drm_device *dev = dev_priv->dev;
860         struct drm_mode_config *mode_config = &dev->mode_config;
861         struct intel_connector *intel_connector;
862         struct intel_encoder *intel_encoder;
863         struct drm_connector *connector;
864         bool hpd_disabled = false;
865         bool changed = false;
866         u32 hpd_event_bits;
867
868         /* HPD irq before everything is fully set up. */
869         if (!dev_priv->enable_hotplug_processing)
870                 return;
871
872         mutex_lock(&mode_config->mutex);
873         DRM_DEBUG_KMS("running encoder hotplug functions\n");
874
875         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
876
877         hpd_event_bits = dev_priv->hpd_event_bits;
878         dev_priv->hpd_event_bits = 0;
879         list_for_each_entry(connector, &mode_config->connector_list, head) {
880                 intel_connector = to_intel_connector(connector);
881                 intel_encoder = intel_connector->encoder;
882                 if (intel_encoder->hpd_pin > HPD_NONE &&
883                     dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED &&
884                     connector->polled == DRM_CONNECTOR_POLL_HPD) {
885                         DRM_INFO("HPD interrupt storm detected on connector %s: "
886                                  "switching from hotplug detection to polling\n",
887                                 drm_get_connector_name(connector));
888                         dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark = HPD_DISABLED;
889                         connector->polled = DRM_CONNECTOR_POLL_CONNECT
890                                 | DRM_CONNECTOR_POLL_DISCONNECT;
891                         hpd_disabled = true;
892                 }
893                 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
894                         DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
895                                       drm_get_connector_name(connector), intel_encoder->hpd_pin);
896                 }
897         }
898          /* if there were no outputs to poll, poll was disabled,
899           * therefore make sure it's enabled when disabling HPD on
900           * some connectors */
901         if (hpd_disabled) {
902                 drm_kms_helper_poll_enable(dev);
903                 mod_timer(&dev_priv->hotplug_reenable_timer,
904                           jiffies + msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
905         }
906
907         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
908
909         list_for_each_entry(connector, &mode_config->connector_list, head) {
910                 intel_connector = to_intel_connector(connector);
911                 intel_encoder = intel_connector->encoder;
912                 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
913                         if (intel_encoder->hot_plug)
914                                 intel_encoder->hot_plug(intel_encoder);
915                         if (intel_hpd_irq_event(dev, connector))
916                                 changed = true;
917                 }
918         }
919         mutex_unlock(&mode_config->mutex);
920
921         if (changed)
922                 drm_kms_helper_hotplug_event(dev);
923 }
924
925 static void ironlake_rps_change_irq_handler(struct drm_device *dev)
926 {
927         drm_i915_private_t *dev_priv = dev->dev_private;
928         u32 busy_up, busy_down, max_avg, min_avg;
929         u8 new_delay;
930
931         lockmgr(&mchdev_lock, LK_EXCLUSIVE);
932
933         I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
934
935         new_delay = dev_priv->ips.cur_delay;
936
937         I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
938         busy_up = I915_READ(RCPREVBSYTUPAVG);
939         busy_down = I915_READ(RCPREVBSYTDNAVG);
940         max_avg = I915_READ(RCBMAXAVG);
941         min_avg = I915_READ(RCBMINAVG);
942
943         /* Handle RCS change request from hw */
944         if (busy_up > max_avg) {
945                 if (dev_priv->ips.cur_delay != dev_priv->ips.max_delay)
946                         new_delay = dev_priv->ips.cur_delay - 1;
947                 if (new_delay < dev_priv->ips.max_delay)
948                         new_delay = dev_priv->ips.max_delay;
949         } else if (busy_down < min_avg) {
950                 if (dev_priv->ips.cur_delay != dev_priv->ips.min_delay)
951                         new_delay = dev_priv->ips.cur_delay + 1;
952                 if (new_delay > dev_priv->ips.min_delay)
953                         new_delay = dev_priv->ips.min_delay;
954         }
955
956         if (ironlake_set_drps(dev, new_delay))
957                 dev_priv->ips.cur_delay = new_delay;
958
959         lockmgr(&mchdev_lock, LK_RELEASE);
960
961         return;
962 }
963
964 static void notify_ring(struct drm_device *dev,
965                         struct intel_ring_buffer *ring)
966 {
967         if (ring->obj == NULL)
968                 return;
969
970         trace_i915_gem_request_complete(ring);
971
972         wake_up_all(&ring->irq_queue);
973         i915_queue_hangcheck(dev);
974 }
975
976 static void gen6_pm_rps_work(struct work_struct *work)
977 {
978         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
979                                                     rps.work);
980         u32 pm_iir;
981         int new_delay, adj;
982
983         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
984         pm_iir = dev_priv->rps.pm_iir;
985         dev_priv->rps.pm_iir = 0;
986         /* Make sure not to corrupt PMIMR state used by ringbuffer code */
987         snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
988         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
989
990         /* Make sure we didn't queue anything we're not going to process. */
991         WARN_ON(pm_iir & ~GEN6_PM_RPS_EVENTS);
992
993         if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0)
994                 return;
995
996         mutex_lock(&dev_priv->rps.hw_lock);
997
998         adj = dev_priv->rps.last_adj;
999         if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
1000                 if (adj > 0)
1001                         adj *= 2;
1002                 else
1003                         adj = 1;
1004                 new_delay = dev_priv->rps.cur_delay + adj;
1005
1006                 /*
1007                  * For better performance, jump directly
1008                  * to RPe if we're below it.
1009                  */
1010                 if (new_delay < dev_priv->rps.rpe_delay)
1011                         new_delay = dev_priv->rps.rpe_delay;
1012         } else if (pm_iir & GEN6_PM_RP_DOWN_TIMEOUT) {
1013                 if (dev_priv->rps.cur_delay > dev_priv->rps.rpe_delay)
1014                         new_delay = dev_priv->rps.rpe_delay;
1015                 else
1016                         new_delay = dev_priv->rps.min_delay;
1017                 adj = 0;
1018         } else if (pm_iir & GEN6_PM_RP_DOWN_THRESHOLD) {
1019                 if (adj < 0)
1020                         adj *= 2;
1021                 else
1022                         adj = -1;
1023                 new_delay = dev_priv->rps.cur_delay + adj;
1024         } else { /* unknown event */
1025                 new_delay = dev_priv->rps.cur_delay;
1026         }
1027
1028         /* sysfs frequency interfaces may have snuck in while servicing the
1029          * interrupt
1030          */
1031         new_delay = clamp_t(int, new_delay,
1032                             dev_priv->rps.min_delay, dev_priv->rps.max_delay);
1033         dev_priv->rps.last_adj = new_delay - dev_priv->rps.cur_delay;
1034
1035         if (IS_VALLEYVIEW(dev_priv->dev))
1036                 valleyview_set_rps(dev_priv->dev, new_delay);
1037         else
1038                 gen6_set_rps(dev_priv->dev, new_delay);
1039
1040         mutex_unlock(&dev_priv->rps.hw_lock);
1041 }
1042
1043
1044 /**
1045  * ivybridge_parity_work - Workqueue called when a parity error interrupt
1046  * occurred.
1047  * @work: workqueue struct
1048  *
1049  * Doesn't actually do anything except notify userspace. As a consequence of
1050  * this event, userspace should try to remap the bad rows since statistically
1051  * it is likely the same row is more likely to go bad again.
1052  */
1053 static void ivybridge_parity_work(struct work_struct *work)
1054 {
1055         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
1056                                                     l3_parity.error_work);
1057         u32 error_status, row, bank, subbank;
1058         char *parity_event[6];
1059         uint32_t misccpctl;
1060         uint8_t slice = 0;
1061
1062         /* We must turn off DOP level clock gating to access the L3 registers.
1063          * In order to prevent a get/put style interface, acquire struct mutex
1064          * any time we access those registers.
1065          */
1066         mutex_lock(&dev_priv->dev->struct_mutex);
1067
1068         /* If we've screwed up tracking, just let the interrupt fire again */
1069         if (WARN_ON(!dev_priv->l3_parity.which_slice))
1070                 goto out;
1071
1072         misccpctl = I915_READ(GEN7_MISCCPCTL);
1073         I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
1074         POSTING_READ(GEN7_MISCCPCTL);
1075
1076         while ((slice = ffs(dev_priv->l3_parity.which_slice)) != 0) {
1077                 u32 reg;
1078
1079                 slice--;
1080                 if (WARN_ON_ONCE(slice >= NUM_L3_SLICES(dev_priv->dev)))
1081                         break;
1082
1083                 dev_priv->l3_parity.which_slice &= ~(1<<slice);
1084
1085                 reg = GEN7_L3CDERRST1 + (slice * 0x200);
1086
1087                 error_status = I915_READ(reg);
1088                 row = GEN7_PARITY_ERROR_ROW(error_status);
1089                 bank = GEN7_PARITY_ERROR_BANK(error_status);
1090                 subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);
1091
1092                 I915_WRITE(reg, GEN7_PARITY_ERROR_VALID | GEN7_L3CDERRST1_ENABLE);
1093                 POSTING_READ(reg);
1094
1095                 parity_event[0] = I915_L3_PARITY_UEVENT "=1";
1096                 parity_event[5] = NULL;
1097
1098 #if 0
1099                 kobject_uevent_env(&dev_priv->dev->primary->kdev->kobj,
1100                                    KOBJ_CHANGE, parity_event);
1101 #endif
1102
1103                 DRM_DEBUG("Parity error: Slice = %d, Row = %d, Bank = %d, Sub bank = %d.\n",
1104                           slice, row, bank, subbank);
1105
1106 #if 0
1107                 kfree(parity_event[4]);
1108                 kfree(parity_event[3]);
1109                 kfree(parity_event[2]);
1110                 kfree(parity_event[1]);
1111 #endif
1112         }
1113
1114         I915_WRITE(GEN7_MISCCPCTL, misccpctl);
1115
1116 out:
1117         WARN_ON(dev_priv->l3_parity.which_slice);
1118         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
1119         ilk_enable_gt_irq(dev_priv, GT_PARITY_ERROR(dev_priv->dev));
1120         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
1121
1122         mutex_unlock(&dev_priv->dev->struct_mutex);
1123 }
1124
1125 static void ivybridge_parity_error_irq_handler(struct drm_device *dev, u32 iir)
1126 {
1127         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1128
1129         if (!HAS_L3_DPF(dev))
1130                 return;
1131
1132         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
1133         ilk_disable_gt_irq(dev_priv, GT_PARITY_ERROR(dev));
1134         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
1135
1136         iir &= GT_PARITY_ERROR(dev);
1137         if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT_S1)
1138                 dev_priv->l3_parity.which_slice |= 1 << 1;
1139
1140         if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT)
1141                 dev_priv->l3_parity.which_slice |= 1 << 0;
1142
1143         queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work);
1144 }
1145
1146 static void ilk_gt_irq_handler(struct drm_device *dev,
1147                                struct drm_i915_private *dev_priv,
1148                                u32 gt_iir)
1149 {
1150         if (gt_iir &
1151             (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
1152                 notify_ring(dev, &dev_priv->ring[RCS]);
1153         if (gt_iir & ILK_BSD_USER_INTERRUPT)
1154                 notify_ring(dev, &dev_priv->ring[VCS]);
1155 }
1156
1157 static void snb_gt_irq_handler(struct drm_device *dev,
1158                                struct drm_i915_private *dev_priv,
1159                                u32 gt_iir)
1160 {
1161
1162         if (gt_iir &
1163             (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
1164                 notify_ring(dev, &dev_priv->ring[RCS]);
1165         if (gt_iir & GT_BSD_USER_INTERRUPT)
1166                 notify_ring(dev, &dev_priv->ring[VCS]);
1167         if (gt_iir & GT_BLT_USER_INTERRUPT)
1168                 notify_ring(dev, &dev_priv->ring[BCS]);
1169
1170         if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT |
1171                       GT_BSD_CS_ERROR_INTERRUPT |
1172                       GT_RENDER_CS_MASTER_ERROR_INTERRUPT)) {
1173                 DRM_ERROR("GT error interrupt 0x%08x\n", gt_iir);
1174                 i915_handle_error(dev, false);
1175         }
1176
1177         if (gt_iir & GT_PARITY_ERROR(dev))
1178                 ivybridge_parity_error_irq_handler(dev, gt_iir);
1179 }
1180
1181 static irqreturn_t gen8_gt_irq_handler(struct drm_device *dev,
1182                                        struct drm_i915_private *dev_priv,
1183                                        u32 master_ctl)
1184 {
1185         u32 rcs, bcs, vcs;
1186         uint32_t tmp = 0;
1187
1188         if (master_ctl & (GEN8_GT_RCS_IRQ | GEN8_GT_BCS_IRQ)) {
1189                 tmp = I915_READ(GEN8_GT_IIR(0));
1190                 if (tmp) {
1191                         rcs = tmp >> GEN8_RCS_IRQ_SHIFT;
1192                         bcs = tmp >> GEN8_BCS_IRQ_SHIFT;
1193                         if (rcs & GT_RENDER_USER_INTERRUPT)
1194                                 notify_ring(dev, &dev_priv->ring[RCS]);
1195                         if (bcs & GT_RENDER_USER_INTERRUPT)
1196                                 notify_ring(dev, &dev_priv->ring[BCS]);
1197                         I915_WRITE(GEN8_GT_IIR(0), tmp);
1198                 } else
1199                         DRM_ERROR("The master control interrupt lied (GT0)!\n");
1200         }
1201
1202         if (master_ctl & GEN8_GT_VCS1_IRQ) {
1203                 tmp = I915_READ(GEN8_GT_IIR(1));
1204                 if (tmp) {
1205                         vcs = tmp >> GEN8_VCS1_IRQ_SHIFT;
1206                         if (vcs & GT_RENDER_USER_INTERRUPT)
1207                                 notify_ring(dev, &dev_priv->ring[VCS]);
1208                         I915_WRITE(GEN8_GT_IIR(1), tmp);
1209                 } else
1210                         DRM_ERROR("The master control interrupt lied (GT1)!\n");
1211         }
1212
1213         if (master_ctl & GEN8_GT_VECS_IRQ) {
1214                 tmp = I915_READ(GEN8_GT_IIR(3));
1215                 if (tmp) {
1216                         vcs = tmp >> GEN8_VECS_IRQ_SHIFT;
1217                         if (vcs & GT_RENDER_USER_INTERRUPT)
1218                                 notify_ring(dev, &dev_priv->ring[VECS]);
1219                         I915_WRITE(GEN8_GT_IIR(3), tmp);
1220                 } else
1221                         DRM_ERROR("The master control interrupt lied (GT3)!\n");
1222         }
1223
1224 }
1225
1226 #define HPD_STORM_DETECT_PERIOD 1000
1227 #define HPD_STORM_THRESHOLD 5
1228
1229 static inline void intel_hpd_irq_handler(struct drm_device *dev,
1230                                          u32 hotplug_trigger,
1231                                          const u32 *hpd)
1232 {
1233         drm_i915_private_t *dev_priv = dev->dev_private;
1234         int i;
1235         bool storm_detected = false;
1236
1237         if (!hotplug_trigger)
1238                 return;
1239
1240         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
1241         for (i = 1; i < HPD_NUM_PINS; i++) {
1242
1243                 WARN_ONCE(hpd[i] & hotplug_trigger &&
1244                           dev_priv->hpd_stats[i].hpd_mark == HPD_DISABLED,
1245                           "Received HPD interrupt (0x%08x) on pin %d (0x%08x) although disabled\n",
1246                           hotplug_trigger, i, hpd[i]);
1247
1248                 if (!(hpd[i] & hotplug_trigger) ||
1249                     dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED)
1250                         continue;
1251
1252                 dev_priv->hpd_event_bits |= (1 << i);
1253                 if (!time_in_range(jiffies, dev_priv->hpd_stats[i].hpd_last_jiffies,
1254                                    dev_priv->hpd_stats[i].hpd_last_jiffies
1255                                    + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) {
1256                         dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies;
1257                         dev_priv->hpd_stats[i].hpd_cnt = 0;
1258                         DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", i);
1259                 } else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) {
1260                         dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
1261                         dev_priv->hpd_event_bits &= ~(1 << i);
1262                         DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", i);
1263                         storm_detected = true;
1264                 } else {
1265                         dev_priv->hpd_stats[i].hpd_cnt++;
1266                         DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", i,
1267                                       dev_priv->hpd_stats[i].hpd_cnt);
1268                 }
1269         }
1270
1271         if (storm_detected)
1272                 dev_priv->display.hpd_irq_setup(dev);
1273         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
1274
1275         /*
1276          * Our hotplug handler can grab modeset locks (by calling down into the
1277          * fb helpers). Hence it must not be run on our own dev-priv->wq work
1278          * queue for otherwise the flush_work in the pageflip code will
1279          * deadlock.
1280          */
1281         schedule_work(&dev_priv->hotplug_work);
1282 }
1283
1284 static void gmbus_irq_handler(struct drm_device *dev)
1285 {
1286         struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
1287
1288         wake_up_all(&dev_priv->gmbus_wait_queue);
1289 }
1290
1291 static void dp_aux_irq_handler(struct drm_device *dev)
1292 {
1293         struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
1294
1295         wake_up_all(&dev_priv->gmbus_wait_queue);
1296 }
1297
1298 #if defined(CONFIG_DEBUG_FS)
1299 static void display_pipe_crc_irq_handler(struct drm_device *dev, enum i915_pipe pipe,
1300                                          uint32_t crc0, uint32_t crc1,
1301                                          uint32_t crc2, uint32_t crc3,
1302                                          uint32_t crc4)
1303 {
1304         struct drm_i915_private *dev_priv = dev->dev_private;
1305         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
1306         struct intel_pipe_crc_entry *entry;
1307         int head, tail;
1308
1309         spin_lock(&pipe_crc->lock);
1310
1311         if (!pipe_crc->entries) {
1312                 spin_unlock(&pipe_crc->lock);
1313                 DRM_ERROR("spurious interrupt\n");
1314                 return;
1315         }
1316
1317         head = pipe_crc->head;
1318         tail = pipe_crc->tail;
1319
1320         if (CIRC_SPACE(head, tail, INTEL_PIPE_CRC_ENTRIES_NR) < 1) {
1321                 spin_unlock(&pipe_crc->lock);
1322                 DRM_ERROR("CRC buffer overflowing\n");
1323                 return;
1324         }
1325
1326         entry = &pipe_crc->entries[head];
1327
1328         entry->frame = dev->driver->get_vblank_counter(dev, pipe);
1329         entry->crc[0] = crc0;
1330         entry->crc[1] = crc1;
1331         entry->crc[2] = crc2;
1332         entry->crc[3] = crc3;
1333         entry->crc[4] = crc4;
1334
1335         head = (head + 1) & (INTEL_PIPE_CRC_ENTRIES_NR - 1);
1336         pipe_crc->head = head;
1337
1338         spin_unlock(&pipe_crc->lock);
1339
1340         wake_up_interruptible(&pipe_crc->wq);
1341 }
1342 #else
1343 static inline void
1344 display_pipe_crc_irq_handler(struct drm_device *dev, enum i915_pipe pipe,
1345                              uint32_t crc0, uint32_t crc1,
1346                              uint32_t crc2, uint32_t crc3,
1347                              uint32_t crc4) {}
1348 #endif
1349
1350
1351 static void hsw_pipe_crc_irq_handler(struct drm_device *dev, enum i915_pipe pipe)
1352 {
1353         struct drm_i915_private *dev_priv = dev->dev_private;
1354
1355         display_pipe_crc_irq_handler(dev, pipe,
1356                                      I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
1357                                      0, 0, 0, 0);
1358 }
1359
1360 static void ivb_pipe_crc_irq_handler(struct drm_device *dev, enum i915_pipe pipe)
1361 {
1362         struct drm_i915_private *dev_priv = dev->dev_private;
1363
1364         display_pipe_crc_irq_handler(dev, pipe,
1365                                      I915_READ(PIPE_CRC_RES_1_IVB(pipe)),
1366                                      I915_READ(PIPE_CRC_RES_2_IVB(pipe)),
1367                                      I915_READ(PIPE_CRC_RES_3_IVB(pipe)),
1368                                      I915_READ(PIPE_CRC_RES_4_IVB(pipe)),
1369                                      I915_READ(PIPE_CRC_RES_5_IVB(pipe)));
1370 }
1371
1372 static void i9xx_pipe_crc_irq_handler(struct drm_device *dev, enum i915_pipe pipe)
1373 {
1374         struct drm_i915_private *dev_priv = dev->dev_private;
1375         uint32_t res1, res2;
1376
1377         if (INTEL_INFO(dev)->gen >= 3)
1378                 res1 = I915_READ(PIPE_CRC_RES_RES1_I915(pipe));
1379         else
1380                 res1 = 0;
1381
1382         if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
1383                 res2 = I915_READ(PIPE_CRC_RES_RES2_G4X(pipe));
1384         else
1385                 res2 = 0;
1386
1387         display_pipe_crc_irq_handler(dev, pipe,
1388                                      I915_READ(PIPE_CRC_RES_RED(pipe)),
1389                                      I915_READ(PIPE_CRC_RES_GREEN(pipe)),
1390                                      I915_READ(PIPE_CRC_RES_BLUE(pipe)),
1391                                      res1, res2);
1392 }
1393
1394 /* The RPS events need forcewake, so we add them to a work queue and mask their
1395  * IMR bits until the work is done. Other interrupts can be processed without
1396  * the work queue. */
1397 static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir)
1398 {
1399         if (pm_iir & GEN6_PM_RPS_EVENTS) {
1400                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
1401                 dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
1402                 snb_disable_pm_irq(dev_priv, pm_iir & GEN6_PM_RPS_EVENTS);
1403                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
1404
1405                 queue_work(dev_priv->wq, &dev_priv->rps.work);
1406         }
1407
1408         if (HAS_VEBOX(dev_priv->dev)) {
1409                 if (pm_iir & PM_VEBOX_USER_INTERRUPT)
1410                         notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
1411
1412                 if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
1413                         DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir);
1414                         i915_handle_error(dev_priv->dev, false);
1415                 }
1416         }
1417 }
1418
1419 static irqreturn_t valleyview_irq_handler(void *arg)
1420 {
1421         struct drm_device *dev = (struct drm_device *) arg;
1422         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1423         u32 iir, gt_iir, pm_iir;
1424         int pipe;
1425         u32 pipe_stats[I915_MAX_PIPES];
1426
1427         atomic_inc(&dev_priv->irq_received);
1428
1429         while (true) {
1430                 iir = I915_READ(VLV_IIR);
1431                 gt_iir = I915_READ(GTIIR);
1432                 pm_iir = I915_READ(GEN6_PMIIR);
1433
1434                 if (gt_iir == 0 && pm_iir == 0 && iir == 0)
1435                         goto out;
1436
1437
1438                 snb_gt_irq_handler(dev, dev_priv, gt_iir);
1439
1440                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
1441                 for_each_pipe(pipe) {
1442                         int reg = PIPESTAT(pipe);
1443                         pipe_stats[pipe] = I915_READ(reg);
1444
1445                         /*
1446                          * Clear the PIPE*STAT regs before the IIR
1447                          */
1448                         if (pipe_stats[pipe] & 0x8000ffff) {
1449                                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
1450                                         DRM_DEBUG_DRIVER("pipe %c underrun\n",
1451                                                          pipe_name(pipe));
1452                                 I915_WRITE(reg, pipe_stats[pipe]);
1453                         }
1454                 }
1455                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
1456
1457                 for_each_pipe(pipe) {
1458                         if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
1459                                 drm_handle_vblank(dev, pipe);
1460
1461                         if (pipe_stats[pipe] & PLANE_FLIPDONE_INT_STATUS_VLV) {
1462                                 intel_prepare_page_flip(dev, pipe);
1463                                 intel_finish_page_flip(dev, pipe);
1464                         }
1465
1466                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
1467                                 i9xx_pipe_crc_irq_handler(dev, pipe);
1468                 }
1469
1470                 /* Consume port.  Then clear IIR or we'll miss events */
1471                 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
1472                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
1473                         u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
1474
1475                         DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
1476                                          hotplug_status);
1477
1478                         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
1479
1480                         if (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
1481                                 dp_aux_irq_handler(dev);
1482
1483                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
1484                         I915_READ(PORT_HOTPLUG_STAT);
1485                 }
1486
1487                 if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
1488                         gmbus_irq_handler(dev);
1489
1490                 if (pm_iir)
1491                         gen6_rps_irq_handler(dev_priv, pm_iir);
1492
1493                 I915_WRITE(GTIIR, gt_iir);
1494                 I915_WRITE(GEN6_PMIIR, pm_iir);
1495                 I915_WRITE(VLV_IIR, iir);
1496         }
1497
1498 out:
1499         return;
1500 }
1501
1502 static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
1503 {
1504         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1505         int pipe;
1506         u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
1507
1508         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_ibx);
1509
1510         if (pch_iir & SDE_AUDIO_POWER_MASK) {
1511                 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
1512                                SDE_AUDIO_POWER_SHIFT);
1513                 DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
1514                                  port_name(port));
1515         }
1516
1517         if (pch_iir & SDE_AUX_MASK)
1518                 dp_aux_irq_handler(dev);
1519
1520         if (pch_iir & SDE_GMBUS)
1521                 gmbus_irq_handler(dev);
1522
1523         if (pch_iir & SDE_AUDIO_HDCP_MASK)
1524                 DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
1525
1526         if (pch_iir & SDE_AUDIO_TRANS_MASK)
1527                 DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
1528
1529         if (pch_iir & SDE_POISON)
1530                 DRM_ERROR("PCH poison interrupt\n");
1531
1532         if (pch_iir & SDE_FDI_MASK)
1533                 for_each_pipe(pipe)
1534                         DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
1535                                          pipe_name(pipe),
1536                                          I915_READ(FDI_RX_IIR(pipe)));
1537
1538         if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
1539                 DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
1540
1541         if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
1542                 DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
1543
1544         if (pch_iir & SDE_TRANSA_FIFO_UNDER)
1545                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1546                                                           false))
1547                         DRM_DEBUG_DRIVER("PCH transcoder A FIFO underrun\n");
1548
1549         if (pch_iir & SDE_TRANSB_FIFO_UNDER)
1550                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1551                                                           false))
1552                         DRM_DEBUG_DRIVER("PCH transcoder B FIFO underrun\n");
1553 }
1554
1555 static void ivb_err_int_handler(struct drm_device *dev)
1556 {
1557         struct drm_i915_private *dev_priv = dev->dev_private;
1558         u32 err_int = I915_READ(GEN7_ERR_INT);
1559         enum i915_pipe pipe;
1560
1561         if (err_int & ERR_INT_POISON)
1562                 DRM_ERROR("Poison interrupt\n");
1563
1564         for_each_pipe(pipe) {
1565                 if (err_int & ERR_INT_FIFO_UNDERRUN(pipe)) {
1566                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe,
1567                                                                   false))
1568                                 DRM_DEBUG_DRIVER("Pipe %c FIFO underrun\n",
1569                                                  pipe_name(pipe));
1570                 }
1571
1572                 if (err_int & ERR_INT_PIPE_CRC_DONE(pipe)) {
1573                         if (IS_IVYBRIDGE(dev))
1574                                 ivb_pipe_crc_irq_handler(dev, pipe);
1575                         else
1576                                 hsw_pipe_crc_irq_handler(dev, pipe);
1577                 }
1578         }
1579
1580         I915_WRITE(GEN7_ERR_INT, err_int);
1581 }
1582
1583 static void cpt_serr_int_handler(struct drm_device *dev)
1584 {
1585         struct drm_i915_private *dev_priv = dev->dev_private;
1586         u32 serr_int = I915_READ(SERR_INT);
1587
1588         if (serr_int & SERR_INT_POISON)
1589                 DRM_ERROR("PCH poison interrupt\n");
1590
1591         if (serr_int & SERR_INT_TRANS_A_FIFO_UNDERRUN)
1592                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1593                                                           false))
1594                         DRM_DEBUG_DRIVER("PCH transcoder A FIFO underrun\n");
1595
1596         if (serr_int & SERR_INT_TRANS_B_FIFO_UNDERRUN)
1597                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1598                                                           false))
1599                         DRM_DEBUG_DRIVER("PCH transcoder B FIFO underrun\n");
1600
1601         if (serr_int & SERR_INT_TRANS_C_FIFO_UNDERRUN)
1602                 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_C,
1603                                                           false))
1604                         DRM_DEBUG_DRIVER("PCH transcoder C FIFO underrun\n");
1605
1606         I915_WRITE(SERR_INT, serr_int);
1607 }
1608
1609 static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
1610 {
1611         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1612         int pipe;
1613         u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
1614
1615         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_cpt);
1616
1617         if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
1618                 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
1619                                SDE_AUDIO_POWER_SHIFT_CPT);
1620                 DRM_DEBUG_DRIVER("PCH audio power change on port %c\n",
1621                                  port_name(port));
1622         }
1623
1624         if (pch_iir & SDE_AUX_MASK_CPT)
1625                 dp_aux_irq_handler(dev);
1626
1627         if (pch_iir & SDE_GMBUS_CPT)
1628                 gmbus_irq_handler(dev);
1629
1630         if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
1631                 DRM_DEBUG_DRIVER("Audio CP request interrupt\n");
1632
1633         if (pch_iir & SDE_AUDIO_CP_CHG_CPT)
1634                 DRM_DEBUG_DRIVER("Audio CP change interrupt\n");
1635
1636         if (pch_iir & SDE_FDI_MASK_CPT)
1637                 for_each_pipe(pipe)
1638                         DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
1639                                          pipe_name(pipe),
1640                                          I915_READ(FDI_RX_IIR(pipe)));
1641
1642         if (pch_iir & SDE_ERROR_CPT)
1643                 cpt_serr_int_handler(dev);
1644 }
1645
1646 static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
1647 {
1648         struct drm_i915_private *dev_priv = dev->dev_private;
1649         enum i915_pipe pipe;
1650
1651         if (de_iir & DE_AUX_CHANNEL_A)
1652                 dp_aux_irq_handler(dev);
1653
1654         if (de_iir & DE_GSE)
1655                 intel_opregion_asle_intr(dev);
1656
1657         if (de_iir & DE_POISON)
1658                 DRM_ERROR("Poison interrupt\n");
1659
1660         for_each_pipe(pipe) {
1661                 if (de_iir & DE_PIPE_VBLANK(pipe))
1662                         drm_handle_vblank(dev, pipe);
1663
1664                 if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe))
1665                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe, false))
1666                                 DRM_DEBUG_DRIVER("Pipe %c FIFO underrun\n",
1667                                                  pipe_name(pipe));
1668
1669                 if (de_iir & DE_PIPE_CRC_DONE(pipe))
1670                         i9xx_pipe_crc_irq_handler(dev, pipe);
1671
1672                 /* plane/pipes map 1:1 on ilk+ */
1673                 if (de_iir & DE_PLANE_FLIP_DONE(pipe)) {
1674                         intel_prepare_page_flip(dev, pipe);
1675                         intel_finish_page_flip_plane(dev, pipe);
1676                 }
1677         }
1678
1679         /* check event from PCH */
1680         if (de_iir & DE_PCH_EVENT) {
1681                 u32 pch_iir = I915_READ(SDEIIR);
1682
1683                 if (HAS_PCH_CPT(dev))
1684                         cpt_irq_handler(dev, pch_iir);
1685                 else
1686                         ibx_irq_handler(dev, pch_iir);
1687
1688                 /* should clear PCH hotplug event before clear CPU irq */
1689                 I915_WRITE(SDEIIR, pch_iir);
1690         }
1691
1692         if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT)
1693                 ironlake_rps_change_irq_handler(dev);
1694 }
1695
1696 static void ivb_display_irq_handler(struct drm_device *dev, u32 de_iir)
1697 {
1698         struct drm_i915_private *dev_priv = dev->dev_private;
1699         enum i915_pipe i;
1700
1701         if (de_iir & DE_ERR_INT_IVB)
1702                 ivb_err_int_handler(dev);
1703
1704         if (de_iir & DE_AUX_CHANNEL_A_IVB)
1705                 dp_aux_irq_handler(dev);
1706
1707         if (de_iir & DE_GSE_IVB)
1708                 intel_opregion_asle_intr(dev);
1709
1710         for_each_pipe(i) {
1711                 if (de_iir & (DE_PIPE_VBLANK_IVB(i)))
1712                         drm_handle_vblank(dev, i);
1713
1714                 /* plane/pipes map 1:1 on ilk+ */
1715                 if (de_iir & DE_PLANE_FLIP_DONE_IVB(i)) {
1716                         intel_prepare_page_flip(dev, i);
1717                         intel_finish_page_flip_plane(dev, i);
1718                 }
1719         }
1720
1721         /* check event from PCH */
1722         if (!HAS_PCH_NOP(dev) && (de_iir & DE_PCH_EVENT_IVB)) {
1723                 u32 pch_iir = I915_READ(SDEIIR);
1724
1725                 cpt_irq_handler(dev, pch_iir);
1726
1727                 /* clear PCH hotplug event before clear CPU irq */
1728                 I915_WRITE(SDEIIR, pch_iir);
1729         }
1730 }
1731
1732 static irqreturn_t ironlake_irq_handler(void *arg)
1733 {
1734         struct drm_device *dev = (struct drm_device *) arg;
1735         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1736         u32 de_iir, gt_iir, de_ier, sde_ier = 0;
1737
1738         atomic_inc(&dev_priv->irq_received);
1739
1740         /* We get interrupts on unclaimed registers, so check for this before we
1741          * do any I915_{READ,WRITE}. */
1742         intel_uncore_check_errors(dev);
1743
1744         /* disable master interrupt before clearing iir  */
1745         de_ier = I915_READ(DEIER);
1746         I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
1747         POSTING_READ(DEIER);
1748
1749         /* Disable south interrupts. We'll only write to SDEIIR once, so further
1750          * interrupts will will be stored on its back queue, and then we'll be
1751          * able to process them after we restore SDEIER (as soon as we restore
1752          * it, we'll get an interrupt if SDEIIR still has something to process
1753          * due to its back queue). */
1754         if (!HAS_PCH_NOP(dev)) {
1755                 sde_ier = I915_READ(SDEIER);
1756                 I915_WRITE(SDEIER, 0);
1757                 POSTING_READ(SDEIER);
1758         }
1759
1760         gt_iir = I915_READ(GTIIR);
1761         if (gt_iir) {
1762                 if (INTEL_INFO(dev)->gen >= 6)
1763                         snb_gt_irq_handler(dev, dev_priv, gt_iir);
1764                 else
1765                         ilk_gt_irq_handler(dev, dev_priv, gt_iir);
1766                 I915_WRITE(GTIIR, gt_iir);
1767         }
1768
1769         de_iir = I915_READ(DEIIR);
1770         if (de_iir) {
1771                 if (INTEL_INFO(dev)->gen >= 7)
1772                         ivb_display_irq_handler(dev, de_iir);
1773                 else
1774                         ilk_display_irq_handler(dev, de_iir);
1775                 I915_WRITE(DEIIR, de_iir);
1776         }
1777
1778         if (INTEL_INFO(dev)->gen >= 6) {
1779                 u32 pm_iir = I915_READ(GEN6_PMIIR);
1780                 if (pm_iir) {
1781                         gen6_rps_irq_handler(dev_priv, pm_iir);
1782                         I915_WRITE(GEN6_PMIIR, pm_iir);
1783                 }
1784         }
1785
1786         I915_WRITE(DEIER, de_ier);
1787         POSTING_READ(DEIER);
1788         if (!HAS_PCH_NOP(dev)) {
1789                 I915_WRITE(SDEIER, sde_ier);
1790                 POSTING_READ(SDEIER);
1791         }
1792
1793 }
1794
1795 static irqreturn_t gen8_irq_handler(void *arg)
1796 {
1797         struct drm_device *dev = arg;
1798         struct drm_i915_private *dev_priv = dev->dev_private;
1799         u32 master_ctl;
1800         uint32_t tmp = 0;
1801         enum i915_pipe pipe;
1802
1803         atomic_inc(&dev_priv->irq_received);
1804
1805         master_ctl = I915_READ(GEN8_MASTER_IRQ);
1806         master_ctl &= ~GEN8_MASTER_IRQ_CONTROL;
1807         if (!master_ctl)
1808                 return;
1809
1810         I915_WRITE(GEN8_MASTER_IRQ, 0);
1811         POSTING_READ(GEN8_MASTER_IRQ);
1812
1813         gen8_gt_irq_handler(dev, dev_priv, master_ctl);
1814
1815         if (master_ctl & GEN8_DE_MISC_IRQ) {
1816                 tmp = I915_READ(GEN8_DE_MISC_IIR);
1817                 if (tmp & GEN8_DE_MISC_GSE)
1818                         intel_opregion_asle_intr(dev);
1819                 else if (tmp)
1820                         DRM_ERROR("Unexpected DE Misc interrupt\n");
1821                 else
1822                         DRM_ERROR("The master control interrupt lied (DE MISC)!\n");
1823
1824                 if (tmp) {
1825                         I915_WRITE(GEN8_DE_MISC_IIR, tmp);
1826                 }
1827         }
1828
1829         if (master_ctl & GEN8_DE_PORT_IRQ) {
1830                 tmp = I915_READ(GEN8_DE_PORT_IIR);
1831                 if (tmp & GEN8_AUX_CHANNEL_A)
1832                         dp_aux_irq_handler(dev);
1833                 else if (tmp)
1834                         DRM_ERROR("Unexpected DE Port interrupt\n");
1835                 else
1836                         DRM_ERROR("The master control interrupt lied (DE PORT)!\n");
1837
1838                 if (tmp) {
1839                         I915_WRITE(GEN8_DE_PORT_IIR, tmp);
1840                 }
1841         }
1842
1843         for_each_pipe(pipe) {
1844                 uint32_t pipe_iir;
1845
1846                 if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe)))
1847                         continue;
1848
1849                 pipe_iir = I915_READ(GEN8_DE_PIPE_IIR(pipe));
1850                 if (pipe_iir & GEN8_PIPE_VBLANK)
1851                         drm_handle_vblank(dev, pipe);
1852
1853                 if (pipe_iir & GEN8_PIPE_FLIP_DONE) {
1854                         intel_prepare_page_flip(dev, pipe);
1855                         intel_finish_page_flip_plane(dev, pipe);
1856                 }
1857
1858                 if (pipe_iir & GEN8_PIPE_CDCLK_CRC_DONE)
1859                         hsw_pipe_crc_irq_handler(dev, pipe);
1860
1861                 if (pipe_iir & GEN8_PIPE_FIFO_UNDERRUN) {
1862                         if (intel_set_cpu_fifo_underrun_reporting(dev, pipe,
1863                                                                   false))
1864                                 DRM_DEBUG_DRIVER("Pipe %c FIFO underrun\n",
1865                                                  pipe_name(pipe));
1866                 }
1867
1868                 if (pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS) {
1869                         DRM_ERROR("Fault errors on pipe %c\n: 0x%08x",
1870                                   pipe_name(pipe),
1871                                   pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS);
1872                 }
1873
1874                 if (pipe_iir) {
1875                         I915_WRITE(GEN8_DE_PIPE_IIR(pipe), pipe_iir);
1876                 } else
1877                         DRM_ERROR("The master control interrupt lied (DE PIPE)!\n");
1878         }
1879
1880         if (!HAS_PCH_NOP(dev) && master_ctl & GEN8_DE_PCH_IRQ) {
1881                 /*
1882                  * FIXME(BDW): Assume for now that the new interrupt handling
1883                  * scheme also closed the SDE interrupt handling race we've seen
1884                  * on older pch-split platforms. But this needs testing.
1885                  */
1886                 u32 pch_iir = I915_READ(SDEIIR);
1887
1888                 cpt_irq_handler(dev, pch_iir);
1889
1890                 if (pch_iir) {
1891                         I915_WRITE(SDEIIR, pch_iir);
1892                 }
1893         }
1894
1895         I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
1896         POSTING_READ(GEN8_MASTER_IRQ);
1897
1898 }
1899
1900 static void i915_error_wake_up(struct drm_i915_private *dev_priv,
1901                                bool reset_completed)
1902 {
1903         struct intel_ring_buffer *ring;
1904         int i;
1905
1906         /*
1907          * Notify all waiters for GPU completion events that reset state has
1908          * been changed, and that they need to restart their wait after
1909          * checking for potential errors (and bail out to drop locks if there is
1910          * a gpu reset pending so that i915_error_work_func can acquire them).
1911          */
1912
1913         /* Wake up __wait_seqno, potentially holding dev->struct_mutex. */
1914         for_each_ring(ring, dev_priv, i)
1915                 wake_up_all(&ring->irq_queue);
1916
1917         /* Wake up intel_crtc_wait_for_pending_flips, holding crtc->mutex. */
1918         wake_up_all(&dev_priv->pending_flip_queue);
1919
1920         /*
1921          * Signal tasks blocked in i915_gem_wait_for_error that the pending
1922          * reset state is cleared.
1923          */
1924         if (reset_completed)
1925                 wake_up_all(&dev_priv->gpu_error.reset_queue);
1926 }
1927
1928 /**
1929  * i915_error_work_func - do process context error handling work
1930  * @work: work struct
1931  *
1932  * Fire an error uevent so userspace can see that a hang or error
1933  * was detected.
1934  */
1935 static void i915_error_work_func(struct work_struct *work)
1936 {
1937         struct i915_gpu_error *error = container_of(work, struct i915_gpu_error,
1938                                                     work);
1939         drm_i915_private_t *dev_priv = container_of(error, drm_i915_private_t,
1940                                                     gpu_error);
1941         struct drm_device *dev = dev_priv->dev;
1942 #if 0
1943         char *error_event[] = { I915_ERROR_UEVENT "=1", NULL };
1944         char *reset_event[] = { I915_RESET_UEVENT "=1", NULL };
1945         char *reset_done_event[] = { I915_ERROR_UEVENT "=0", NULL };
1946 #endif
1947         int ret;
1948
1949         /* kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, error_event); */
1950
1951         /*
1952          * Note that there's only one work item which does gpu resets, so we
1953          * need not worry about concurrent gpu resets potentially incrementing
1954          * error->reset_counter twice. We only need to take care of another
1955          * racing irq/hangcheck declaring the gpu dead for a second time. A
1956          * quick check for that is good enough: schedule_work ensures the
1957          * correct ordering between hang detection and this work item, and since
1958          * the reset in-progress bit is only ever set by code outside of this
1959          * work we don't need to worry about any other races.
1960          */
1961         if (i915_reset_in_progress(error) && !i915_terminally_wedged(error)) {
1962                 DRM_DEBUG_DRIVER("resetting chip\n");
1963 #if 0
1964                 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE,
1965                                    reset_event);
1966 #endif
1967
1968                 /*
1969                  * All state reset _must_ be completed before we update the
1970                  * reset counter, for otherwise waiters might miss the reset
1971                  * pending state and not properly drop locks, resulting in
1972                  * deadlocks with the reset work.
1973                  */
1974                 ret = i915_reset(dev);
1975
1976                 intel_display_handle_reset(dev);
1977
1978                 if (ret == 0) {
1979                         /*
1980                          * After all the gem state is reset, increment the reset
1981                          * counter and wake up everyone waiting for the reset to
1982                          * complete.
1983                          *
1984                          * Since unlock operations are a one-sided barrier only,
1985                          * we need to insert a barrier here to order any seqno
1986                          * updates before
1987                          * the counter increment.
1988                          */
1989                         cpu_sfence();
1990                         atomic_inc(&dev_priv->gpu_error.reset_counter);
1991
1992 #if 0
1993                         kobject_uevent_env(&dev->primary->kdev->kobj,
1994                                            KOBJ_CHANGE, reset_done_event);
1995 #endif
1996                 } else {
1997                         atomic_set_mask(I915_WEDGED, &error->reset_counter);
1998                 }
1999
2000                 /*
2001                  * Note: The wake_up also serves as a memory barrier so that
2002                  * waiters see the update value of the reset counter atomic_t.
2003                  */
2004                 i915_error_wake_up(dev_priv, true);
2005         }
2006 }
2007
2008 static void i915_report_and_clear_eir(struct drm_device *dev)
2009 {
2010         struct drm_i915_private *dev_priv = dev->dev_private;
2011         uint32_t instdone[I915_NUM_INSTDONE_REG];
2012         u32 eir = I915_READ(EIR);
2013         int pipe, i;
2014
2015         if (!eir)
2016                 return;
2017
2018         pr_err("render error detected, EIR: 0x%08x\n", eir);
2019
2020 #if 0
2021         i915_get_extra_instdone(dev, instdone);
2022 #endif
2023
2024         if (IS_G4X(dev)) {
2025                 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
2026                         u32 ipeir = I915_READ(IPEIR_I965);
2027
2028                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2029                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2030                         for (i = 0; i < ARRAY_SIZE(instdone); i++)
2031                                 pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2032                         pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
2033                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2034                         I915_WRITE(IPEIR_I965, ipeir);
2035                         POSTING_READ(IPEIR_I965);
2036                 }
2037                 if (eir & GM45_ERROR_PAGE_TABLE) {
2038                         u32 pgtbl_err = I915_READ(PGTBL_ER);
2039                         pr_err("page table error\n");
2040                         pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
2041                         I915_WRITE(PGTBL_ER, pgtbl_err);
2042                         POSTING_READ(PGTBL_ER);
2043                 }
2044         }
2045
2046         if (!IS_GEN2(dev)) {
2047                 if (eir & I915_ERROR_PAGE_TABLE) {
2048                         u32 pgtbl_err = I915_READ(PGTBL_ER);
2049                         pr_err("page table error\n");
2050                         pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
2051                         I915_WRITE(PGTBL_ER, pgtbl_err);
2052                         POSTING_READ(PGTBL_ER);
2053                 }
2054         }
2055
2056         if (eir & I915_ERROR_MEMORY_REFRESH) {
2057                 pr_err("memory refresh error:\n");
2058                 for_each_pipe(pipe)
2059                         pr_err("pipe %c stat: 0x%08x\n",
2060                                pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
2061                 /* pipestat has already been acked */
2062         }
2063         if (eir & I915_ERROR_INSTRUCTION) {
2064                 pr_err("instruction error\n");
2065                 pr_err("  INSTPM: 0x%08x\n", I915_READ(INSTPM));
2066                 for (i = 0; i < ARRAY_SIZE(instdone); i++)
2067                         pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2068                 if (INTEL_INFO(dev)->gen < 4) {
2069                         u32 ipeir = I915_READ(IPEIR);
2070
2071                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR));
2072                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR));
2073                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD));
2074                         I915_WRITE(IPEIR, ipeir);
2075                         POSTING_READ(IPEIR);
2076                 } else {
2077                         u32 ipeir = I915_READ(IPEIR_I965);
2078
2079                         pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2080                         pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2081                         pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
2082                         pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2083                         I915_WRITE(IPEIR_I965, ipeir);
2084                         POSTING_READ(IPEIR_I965);
2085                 }
2086         }
2087
2088         I915_WRITE(EIR, eir);
2089         POSTING_READ(EIR);
2090         eir = I915_READ(EIR);
2091         if (eir) {
2092                 /*
2093                  * some errors might have become stuck,
2094                  * mask them.
2095                  */
2096                 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
2097                 I915_WRITE(EMR, I915_READ(EMR) | eir);
2098                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
2099         }
2100 }
2101
2102 /**
2103  * i915_handle_error - handle an error interrupt
2104  * @dev: drm device
2105  *
2106  * Do some basic checking of regsiter state at error interrupt time and
2107  * dump it to the syslog.  Also call i915_capture_error_state() to make
2108  * sure we get a record and make it available in debugfs.  Fire a uevent
2109  * so userspace knows something bad happened (should trigger collection
2110  * of a ring dump etc.).
2111  */
2112 void i915_handle_error(struct drm_device *dev, bool wedged)
2113 {
2114         struct drm_i915_private *dev_priv = dev->dev_private;
2115
2116 #if 0
2117         i915_capture_error_state(dev);
2118 #endif
2119         i915_report_and_clear_eir(dev);
2120
2121         if (wedged) {
2122                 atomic_set_mask(I915_RESET_IN_PROGRESS_FLAG,
2123                                 &dev_priv->gpu_error.reset_counter);
2124
2125                 /*
2126                  * Wakeup waiting processes so that the reset work function
2127                  * i915_error_work_func doesn't deadlock trying to grab various
2128                  * locks. By bumping the reset counter first, the woken
2129                  * processes will see a reset in progress and back off,
2130                  * releasing their locks and then wait for the reset completion.
2131                  * We must do this for _all_ gpu waiters that might hold locks
2132                  * that the reset work needs to acquire.
2133                  *
2134                  * Note: The wake_up serves as the required memory barrier to
2135                  * ensure that the waiters see the updated value of the reset
2136                  * counter atomic_t.
2137                  */
2138                 i915_error_wake_up(dev_priv, false);
2139         }
2140
2141         /*
2142          * Our reset work can grab modeset locks (since it needs to reset the
2143          * state of outstanding pagelips). Hence it must not be run on our own
2144          * dev-priv->wq work queue for otherwise the flush_work in the pageflip
2145          * code will deadlock.
2146          */
2147         schedule_work(&dev_priv->gpu_error.work);
2148 }
2149
2150 static void __always_unused i915_pageflip_stall_check(struct drm_device *dev, int pipe)
2151 {
2152         drm_i915_private_t *dev_priv = dev->dev_private;
2153         struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
2154         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2155         struct drm_i915_gem_object *obj;
2156         struct intel_unpin_work *work;
2157         bool stall_detected;
2158
2159         /* Ignore early vblank irqs */
2160         if (intel_crtc == NULL)
2161                 return;
2162
2163         lockmgr(&dev->event_lock, LK_EXCLUSIVE);
2164         work = intel_crtc->unpin_work;
2165
2166         if (work == NULL ||
2167             atomic_read(&work->pending) >= INTEL_FLIP_COMPLETE ||
2168             !work->enable_stall_check) {
2169                 /* Either the pending flip IRQ arrived, or we're too early. Don't check */
2170                 lockmgr(&dev->event_lock, LK_RELEASE);
2171                 return;
2172         }
2173
2174         /* Potential stall - if we see that the flip has happened, assume a missed interrupt */
2175         obj = work->pending_flip_obj;
2176         if (INTEL_INFO(dev)->gen >= 4) {
2177                 int dspsurf = DSPSURF(intel_crtc->plane);
2178                 stall_detected = I915_HI_DISPBASE(I915_READ(dspsurf)) ==
2179                                         i915_gem_obj_ggtt_offset(obj);
2180         } else {
2181                 int dspaddr = DSPADDR(intel_crtc->plane);
2182                 stall_detected = I915_READ(dspaddr) == (i915_gem_obj_ggtt_offset(obj) +
2183                                                         crtc->y * crtc->fb->pitches[0] +
2184                                                         crtc->x * crtc->fb->bits_per_pixel/8);
2185         }
2186
2187         lockmgr(&dev->event_lock, LK_RELEASE);
2188
2189         if (stall_detected) {
2190                 DRM_DEBUG_DRIVER("Pageflip stall detected\n");
2191                 intel_prepare_page_flip(dev, intel_crtc->plane);
2192         }
2193 }
2194
2195 /* Called from drm generic code, passed 'crtc' which
2196  * we use as a pipe index
2197  */
2198 static int i915_enable_vblank(struct drm_device *dev, int pipe)
2199 {
2200         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2201
2202         if (!i915_pipe_enabled(dev, pipe))
2203                 return -EINVAL;
2204
2205         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2206         if (INTEL_INFO(dev)->gen >= 4)
2207                 i915_enable_pipestat(dev_priv, pipe,
2208                                      PIPE_START_VBLANK_INTERRUPT_ENABLE);
2209         else
2210                 i915_enable_pipestat(dev_priv, pipe,
2211                                      PIPE_VBLANK_INTERRUPT_ENABLE);
2212
2213         /* maintain vblank delivery even in deep C-states */
2214         if (dev_priv->info->gen == 3)
2215                 I915_WRITE(INSTPM, _MASKED_BIT_DISABLE(INSTPM_AGPBUSY_DIS));
2216         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2217
2218         return 0;
2219 }
2220
2221 static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
2222 {
2223         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2224         uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) :
2225                                                      DE_PIPE_VBLANK(pipe);
2226
2227         if (!i915_pipe_enabled(dev, pipe))
2228                 return -EINVAL;
2229
2230         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2231         ironlake_enable_display_irq(dev_priv, bit);
2232         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2233
2234         return 0;
2235 }
2236
2237 static int valleyview_enable_vblank(struct drm_device *dev, int pipe)
2238 {
2239         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2240         u32 imr;
2241
2242         if (!i915_pipe_enabled(dev, pipe))
2243                 return -EINVAL;
2244
2245         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2246         imr = I915_READ(VLV_IMR);
2247         if (pipe == PIPE_A)
2248                 imr &= ~I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
2249         else
2250                 imr &= ~I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2251         I915_WRITE(VLV_IMR, imr);
2252         i915_enable_pipestat(dev_priv, pipe,
2253                              PIPE_START_VBLANK_INTERRUPT_ENABLE);
2254         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2255
2256         return 0;
2257 }
2258
2259 static int gen8_enable_vblank(struct drm_device *dev, int pipe)
2260 {
2261         struct drm_i915_private *dev_priv = dev->dev_private;
2262
2263         if (!i915_pipe_enabled(dev, pipe))
2264                 return -EINVAL;
2265
2266         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2267         dev_priv->de_irq_mask[pipe] &= ~GEN8_PIPE_VBLANK;
2268         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
2269         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
2270         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2271         return 0;
2272 }
2273
2274 /* Called from drm generic code, passed 'crtc' which
2275  * we use as a pipe index
2276  */
2277 static void i915_disable_vblank(struct drm_device *dev, int pipe)
2278 {
2279         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2280
2281         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2282         if (dev_priv->info->gen == 3)
2283                 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_DIS));
2284
2285         i915_disable_pipestat(dev_priv, pipe,
2286                               PIPE_VBLANK_INTERRUPT_ENABLE |
2287                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
2288         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2289 }
2290
2291 static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
2292 {
2293         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2294         uint32_t bit = (INTEL_INFO(dev)->gen >= 7) ? DE_PIPE_VBLANK_IVB(pipe) :
2295                                                      DE_PIPE_VBLANK(pipe);
2296
2297         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2298         ironlake_disable_display_irq(dev_priv, bit);
2299         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2300 }
2301
2302 static void valleyview_disable_vblank(struct drm_device *dev, int pipe)
2303 {
2304         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2305         u32 imr;
2306
2307         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2308         i915_disable_pipestat(dev_priv, pipe,
2309                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
2310         imr = I915_READ(VLV_IMR);
2311         if (pipe == PIPE_A)
2312                 imr |= I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
2313         else
2314                 imr |= I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2315         I915_WRITE(VLV_IMR, imr);
2316         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2317 }
2318
2319 static void gen8_disable_vblank(struct drm_device *dev, int pipe)
2320 {
2321         struct drm_i915_private *dev_priv = dev->dev_private;
2322
2323         if (!i915_pipe_enabled(dev, pipe))
2324                 return;
2325
2326         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2327         dev_priv->de_irq_mask[pipe] |= GEN8_PIPE_VBLANK;
2328         I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
2329         POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
2330         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2331 }
2332
2333 static u32
2334 ring_last_seqno(struct intel_ring_buffer *ring)
2335 {
2336         return list_entry(ring->request_list.prev,
2337                           struct drm_i915_gem_request, list)->seqno;
2338 }
2339
2340 static bool
2341 ring_idle(struct intel_ring_buffer *ring, u32 seqno)
2342 {
2343         return (list_empty(&ring->request_list) ||
2344                 i915_seqno_passed(seqno, ring_last_seqno(ring)));
2345 }
2346
2347 static struct intel_ring_buffer *
2348 semaphore_waits_for(struct intel_ring_buffer *ring, u32 *seqno)
2349 {
2350         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2351         u32 cmd, ipehr, acthd, acthd_min;
2352
2353         ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
2354         if ((ipehr & ~(0x3 << 16)) !=
2355             (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER))
2356                 return NULL;
2357
2358         /* ACTHD is likely pointing to the dword after the actual command,
2359          * so scan backwards until we find the MBOX.
2360          */
2361         acthd = intel_ring_get_active_head(ring) & HEAD_ADDR;
2362         acthd_min = max((int)acthd - 3 * 4, 0);
2363         do {
2364                 cmd = ioread32(ring->virtual_start + acthd);
2365                 if (cmd == ipehr)
2366                         break;
2367
2368                 acthd -= 4;
2369                 if (acthd < acthd_min)
2370                         return NULL;
2371         } while (1);
2372
2373         *seqno = ioread32(ring->virtual_start+acthd+4)+1;
2374         return &dev_priv->ring[(ring->id + (((ipehr >> 17) & 1) + 1)) % 3];
2375 }
2376
2377 static int semaphore_passed(struct intel_ring_buffer *ring)
2378 {
2379         struct drm_i915_private *dev_priv = ring->dev->dev_private;
2380         struct intel_ring_buffer *signaller;
2381         u32 seqno, ctl;
2382
2383         ring->hangcheck.deadlock = true;
2384
2385         signaller = semaphore_waits_for(ring, &seqno);
2386         if (signaller == NULL || signaller->hangcheck.deadlock)
2387                 return -1;
2388
2389         /* cursory check for an unkickable deadlock */
2390         ctl = I915_READ_CTL(signaller);
2391         if (ctl & RING_WAIT_SEMAPHORE && semaphore_passed(signaller) < 0)
2392                 return -1;
2393
2394         return i915_seqno_passed(signaller->get_seqno(signaller, false), seqno);
2395 }
2396
2397 static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
2398 {
2399         struct intel_ring_buffer *ring;
2400         int i;
2401
2402         for_each_ring(ring, dev_priv, i)
2403                 ring->hangcheck.deadlock = false;
2404 }
2405
2406 static enum intel_ring_hangcheck_action
2407 ring_stuck(struct intel_ring_buffer *ring, u32 acthd)
2408 {
2409         struct drm_device *dev = ring->dev;
2410         struct drm_i915_private *dev_priv = dev->dev_private;
2411         u32 tmp;
2412
2413         if (ring->hangcheck.acthd != acthd)
2414                 return HANGCHECK_ACTIVE;
2415
2416         if (IS_GEN2(dev))
2417                 return HANGCHECK_HUNG;
2418
2419         /* Is the chip hanging on a WAIT_FOR_EVENT?
2420          * If so we can simply poke the RB_WAIT bit
2421          * and break the hang. This should work on
2422          * all but the second generation chipsets.
2423          */
2424         tmp = I915_READ_CTL(ring);
2425         if (tmp & RING_WAIT) {
2426                 DRM_ERROR("Kicking stuck wait on %s\n",
2427                           ring->name);
2428                 i915_handle_error(dev, false);
2429                 I915_WRITE_CTL(ring, tmp);
2430                 return HANGCHECK_KICK;
2431         }
2432
2433         if (INTEL_INFO(dev)->gen >= 6 && tmp & RING_WAIT_SEMAPHORE) {
2434                 switch (semaphore_passed(ring)) {
2435                 default:
2436                         return HANGCHECK_HUNG;
2437                 case 1:
2438                         DRM_ERROR("Kicking stuck semaphore on %s\n",
2439                                   ring->name);
2440                         i915_handle_error(dev, false);
2441                         I915_WRITE_CTL(ring, tmp);
2442                         return HANGCHECK_KICK;
2443                 case 0:
2444                         return HANGCHECK_WAIT;
2445                 }
2446         }
2447
2448         return HANGCHECK_HUNG;
2449 }
2450
2451 /**
2452  * This is called when the chip hasn't reported back with completed
2453  * batchbuffers in a long time. We keep track per ring seqno progress and
2454  * if there are no progress, hangcheck score for that ring is increased.
2455  * Further, acthd is inspected to see if the ring is stuck. On stuck case
2456  * we kick the ring. If we see no progress on three subsequent calls
2457  * we assume chip is wedged and try to fix it by resetting the chip.
2458  */
2459 static void i915_hangcheck_elapsed(unsigned long data)
2460 {
2461         struct drm_device *dev = (struct drm_device *)data;
2462         drm_i915_private_t *dev_priv = dev->dev_private;
2463         struct intel_ring_buffer *ring;
2464         int i;
2465         int busy_count = 0, rings_hung = 0;
2466         bool stuck[I915_NUM_RINGS] = { 0 };
2467 #define BUSY 1
2468 #define KICK 5
2469 #define HUNG 20
2470 #define FIRE 30
2471
2472         if (!i915_enable_hangcheck)
2473                 return;
2474
2475         for_each_ring(ring, dev_priv, i) {
2476                 u32 seqno, acthd;
2477                 bool busy = true;
2478
2479                 semaphore_clear_deadlocks(dev_priv);
2480
2481                 seqno = ring->get_seqno(ring, false);
2482                 acthd = intel_ring_get_active_head(ring);
2483
2484                 if (ring->hangcheck.seqno == seqno) {
2485                         if (ring_idle(ring, seqno)) {
2486                                 ring->hangcheck.action = HANGCHECK_IDLE;
2487
2488                                 if (waitqueue_active(&ring->irq_queue)) {
2489                                         /* Issue a wake-up to catch stuck h/w. */
2490                                         if (!test_and_set_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings)) {
2491                                                 if (!(dev_priv->gpu_error.test_irq_rings & intel_ring_flag(ring)))
2492                                                         DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
2493                                                                   ring->name);
2494                                                 else
2495                                                         DRM_INFO("Fake missed irq on %s\n",
2496                                                                  ring->name);
2497                                                 wake_up_all(&ring->irq_queue);
2498                                         }
2499                                         /* Safeguard against driver failure */
2500                                         ring->hangcheck.score += BUSY;
2501                                 } else
2502                                         busy = false;
2503                         } else {
2504                                 /* We always increment the hangcheck score
2505                                  * if the ring is busy and still processing
2506                                  * the same request, so that no single request
2507                                  * can run indefinitely (such as a chain of
2508                                  * batches). The only time we do not increment
2509                                  * the hangcheck score on this ring, if this
2510                                  * ring is in a legitimate wait for another
2511                                  * ring. In that case the waiting ring is a
2512                                  * victim and we want to be sure we catch the
2513                                  * right culprit. Then every time we do kick
2514                                  * the ring, add a small increment to the
2515                                  * score so that we can catch a batch that is
2516                                  * being repeatedly kicked and so responsible
2517                                  * for stalling the machine.
2518                                  */
2519                                 ring->hangcheck.action = ring_stuck(ring,
2520                                                                     acthd);
2521
2522                                 switch (ring->hangcheck.action) {
2523                                 case HANGCHECK_IDLE:
2524                                 case HANGCHECK_WAIT:
2525                                         break;
2526                                 case HANGCHECK_ACTIVE:
2527                                         ring->hangcheck.score += BUSY;
2528                                         break;
2529                                 case HANGCHECK_KICK:
2530                                         ring->hangcheck.score += KICK;
2531                                         break;
2532                                 case HANGCHECK_HUNG:
2533                                         ring->hangcheck.score += HUNG;
2534                                         stuck[i] = true;
2535                                         break;
2536                                 }
2537                         }
2538                 } else {
2539                         ring->hangcheck.action = HANGCHECK_ACTIVE;
2540
2541                         /* Gradually reduce the count so that we catch DoS
2542                          * attempts across multiple batches.
2543                          */
2544                         if (ring->hangcheck.score > 0)
2545                                 ring->hangcheck.score--;
2546                 }
2547
2548                 ring->hangcheck.seqno = seqno;
2549                 ring->hangcheck.acthd = acthd;
2550                 busy_count += busy;
2551         }
2552
2553         for_each_ring(ring, dev_priv, i) {
2554                 if (ring->hangcheck.score > FIRE) {
2555                         DRM_INFO("%s on %s\n",
2556                                  stuck[i] ? "stuck" : "no progress",
2557                                  ring->name);
2558                         rings_hung++;
2559                 }
2560         }
2561
2562         if (rings_hung)
2563                 return i915_handle_error(dev, true);
2564
2565         if (busy_count)
2566                 /* Reset timer case chip hangs without another request
2567                  * being added */
2568                 i915_queue_hangcheck(dev);
2569 }
2570
2571 void i915_queue_hangcheck(struct drm_device *dev)
2572 {
2573         struct drm_i915_private *dev_priv = dev->dev_private;
2574         if (!i915_enable_hangcheck)
2575                 return;
2576
2577         mod_timer(&dev_priv->gpu_error.hangcheck_timer,
2578                   round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES));
2579 }
2580
2581 static void ibx_irq_preinstall(struct drm_device *dev)
2582 {
2583         struct drm_i915_private *dev_priv = dev->dev_private;
2584
2585         if (HAS_PCH_NOP(dev))
2586                 return;
2587
2588         /* south display irq */
2589         I915_WRITE(SDEIMR, 0xffffffff);
2590         /*
2591          * SDEIER is also touched by the interrupt handler to work around missed
2592          * PCH interrupts. Hence we can't update it after the interrupt handler
2593          * is enabled - instead we unconditionally enable all PCH interrupt
2594          * sources here, but then only unmask them as needed with SDEIMR.
2595          */
2596         I915_WRITE(SDEIER, 0xffffffff);
2597         POSTING_READ(SDEIER);
2598 }
2599
2600 static void gen5_gt_irq_preinstall(struct drm_device *dev)
2601 {
2602         struct drm_i915_private *dev_priv = dev->dev_private;
2603
2604         /* and GT */
2605         I915_WRITE(GTIMR, 0xffffffff);
2606         I915_WRITE(GTIER, 0x0);
2607         POSTING_READ(GTIER);
2608
2609         if (INTEL_INFO(dev)->gen >= 6) {
2610                 /* and PM */
2611                 I915_WRITE(GEN6_PMIMR, 0xffffffff);
2612                 I915_WRITE(GEN6_PMIER, 0x0);
2613                 POSTING_READ(GEN6_PMIER);
2614         }
2615 }
2616
2617 /* drm_dma.h hooks
2618 */
2619 static void ironlake_irq_preinstall(struct drm_device *dev)
2620 {
2621         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2622
2623         atomic_set(&dev_priv->irq_received, 0);
2624
2625         I915_WRITE(HWSTAM, 0xeffe);
2626
2627         I915_WRITE(DEIMR, 0xffffffff);
2628         I915_WRITE(DEIER, 0x0);
2629         POSTING_READ(DEIER);
2630
2631         gen5_gt_irq_preinstall(dev);
2632
2633         ibx_irq_preinstall(dev);
2634 }
2635
2636 static void valleyview_irq_preinstall(struct drm_device *dev)
2637 {
2638         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2639         int pipe;
2640
2641         atomic_set(&dev_priv->irq_received, 0);
2642
2643         /* VLV magic */
2644         I915_WRITE(VLV_IMR, 0);
2645         I915_WRITE(RING_IMR(RENDER_RING_BASE), 0);
2646         I915_WRITE(RING_IMR(GEN6_BSD_RING_BASE), 0);
2647         I915_WRITE(RING_IMR(BLT_RING_BASE), 0);
2648
2649         /* and GT */
2650         I915_WRITE(GTIIR, I915_READ(GTIIR));
2651         I915_WRITE(GTIIR, I915_READ(GTIIR));
2652
2653         gen5_gt_irq_preinstall(dev);
2654
2655         I915_WRITE(DPINVGTT, 0xff);
2656
2657         I915_WRITE(PORT_HOTPLUG_EN, 0);
2658         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2659         for_each_pipe(pipe)
2660                 I915_WRITE(PIPESTAT(pipe), 0xffff);
2661         I915_WRITE(VLV_IIR, 0xffffffff);
2662         I915_WRITE(VLV_IMR, 0xffffffff);
2663         I915_WRITE(VLV_IER, 0x0);
2664         POSTING_READ(VLV_IER);
2665 }
2666
2667 static void gen8_irq_preinstall(struct drm_device *dev)
2668 {
2669         struct drm_i915_private *dev_priv = dev->dev_private;
2670         int pipe;
2671
2672         atomic_set(&dev_priv->irq_received, 0);
2673
2674         I915_WRITE(GEN8_MASTER_IRQ, 0);
2675         POSTING_READ(GEN8_MASTER_IRQ);
2676
2677         /* IIR can theoretically queue up two events. Be paranoid */
2678 #define GEN8_IRQ_INIT_NDX(type, which) do { \
2679                 I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
2680                 POSTING_READ(GEN8_##type##_IMR(which)); \
2681                 I915_WRITE(GEN8_##type##_IER(which), 0); \
2682                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
2683                 POSTING_READ(GEN8_##type##_IIR(which)); \
2684                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
2685         } while (0)
2686
2687 #define GEN8_IRQ_INIT(type) do { \
2688                 I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
2689                 POSTING_READ(GEN8_##type##_IMR); \
2690                 I915_WRITE(GEN8_##type##_IER, 0); \
2691                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
2692                 POSTING_READ(GEN8_##type##_IIR); \
2693                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
2694         } while (0)
2695
2696         GEN8_IRQ_INIT_NDX(GT, 0);
2697         GEN8_IRQ_INIT_NDX(GT, 1);
2698         GEN8_IRQ_INIT_NDX(GT, 2);
2699         GEN8_IRQ_INIT_NDX(GT, 3);
2700
2701         for_each_pipe(pipe) {
2702                 GEN8_IRQ_INIT_NDX(DE_PIPE, pipe);
2703         }
2704
2705         GEN8_IRQ_INIT(DE_PORT);
2706         GEN8_IRQ_INIT(DE_MISC);
2707         GEN8_IRQ_INIT(PCU);
2708 #undef GEN8_IRQ_INIT
2709 #undef GEN8_IRQ_INIT_NDX
2710
2711         POSTING_READ(GEN8_PCU_IIR);
2712
2713         ibx_irq_preinstall(dev);
2714 }
2715
2716 static void ibx_hpd_irq_setup(struct drm_device *dev)
2717 {
2718         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2719         struct drm_mode_config *mode_config = &dev->mode_config;
2720         struct intel_encoder *intel_encoder;
2721         u32 hotplug_irqs, hotplug, enabled_irqs = 0;
2722
2723         if (HAS_PCH_IBX(dev)) {
2724                 hotplug_irqs = SDE_HOTPLUG_MASK;
2725                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2726                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2727                                 enabled_irqs |= hpd_ibx[intel_encoder->hpd_pin];
2728         } else {
2729                 hotplug_irqs = SDE_HOTPLUG_MASK_CPT;
2730                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2731                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2732                                 enabled_irqs |= hpd_cpt[intel_encoder->hpd_pin];
2733         }
2734
2735         ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
2736
2737         /*
2738          * Enable digital hotplug on the PCH, and configure the DP short pulse
2739          * duration to 2ms (which is the minimum in the Display Port spec)
2740          *
2741          * This register is the same on all known PCH chips.
2742          */
2743         hotplug = I915_READ(PCH_PORT_HOTPLUG);
2744         hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
2745         hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
2746         hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
2747         hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
2748         I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
2749 }
2750
2751 static void ibx_irq_postinstall(struct drm_device *dev)
2752 {
2753         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2754         u32 mask;
2755
2756         if (HAS_PCH_NOP(dev))
2757                 return;
2758
2759         if (HAS_PCH_IBX(dev)) {
2760                 mask = SDE_GMBUS | SDE_AUX_MASK | SDE_POISON;
2761         } else {
2762                 mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT;
2763
2764                 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
2765         }
2766
2767         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
2768         I915_WRITE(SDEIMR, ~mask);
2769 }
2770
2771 static void gen5_gt_irq_postinstall(struct drm_device *dev)
2772 {
2773         struct drm_i915_private *dev_priv = dev->dev_private;
2774         u32 pm_irqs, gt_irqs;
2775
2776         pm_irqs = gt_irqs = 0;
2777
2778         dev_priv->gt_irq_mask = ~0;
2779         if (HAS_L3_DPF(dev)) {
2780                 /* L3 parity interrupt is always unmasked. */
2781                 dev_priv->gt_irq_mask = ~GT_PARITY_ERROR(dev);
2782                 gt_irqs |= GT_PARITY_ERROR(dev);
2783         }
2784
2785         gt_irqs |= GT_RENDER_USER_INTERRUPT;
2786         if (IS_GEN5(dev)) {
2787                 gt_irqs |= GT_RENDER_PIPECTL_NOTIFY_INTERRUPT |
2788                            ILK_BSD_USER_INTERRUPT;
2789         } else {
2790                 gt_irqs |= GT_BLT_USER_INTERRUPT | GT_BSD_USER_INTERRUPT;
2791         }
2792
2793         I915_WRITE(GTIIR, I915_READ(GTIIR));
2794         I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
2795         I915_WRITE(GTIER, gt_irqs);
2796         POSTING_READ(GTIER);
2797
2798         if (INTEL_INFO(dev)->gen >= 6) {
2799                 pm_irqs |= GEN6_PM_RPS_EVENTS;
2800
2801                 if (HAS_VEBOX(dev))
2802                         pm_irqs |= PM_VEBOX_USER_INTERRUPT;
2803
2804                 dev_priv->pm_irq_mask = 0xffffffff;
2805                 I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
2806                 I915_WRITE(GEN6_PMIMR, dev_priv->pm_irq_mask);
2807                 I915_WRITE(GEN6_PMIER, pm_irqs);
2808                 POSTING_READ(GEN6_PMIER);
2809         }
2810 }
2811
2812 static int ironlake_irq_postinstall(struct drm_device *dev)
2813 {
2814         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2815         u32 display_mask, extra_mask;
2816
2817         if (INTEL_INFO(dev)->gen >= 7) {
2818                 display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE_IVB |
2819                                 DE_PCH_EVENT_IVB | DE_PLANEC_FLIP_DONE_IVB |
2820                                 DE_PLANEB_FLIP_DONE_IVB |
2821                                 DE_PLANEA_FLIP_DONE_IVB | DE_AUX_CHANNEL_A_IVB);
2822                 extra_mask = (DE_PIPEC_VBLANK_IVB | DE_PIPEB_VBLANK_IVB |
2823                               DE_PIPEA_VBLANK_IVB | DE_ERR_INT_IVB);
2824
2825                 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
2826         } else {
2827                 display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
2828                                 DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
2829                                 DE_AUX_CHANNEL_A |
2830                                 DE_PIPEB_CRC_DONE | DE_PIPEA_CRC_DONE |
2831                                 DE_POISON);
2832                 extra_mask = DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT |
2833                                 DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN;
2834         }
2835
2836         dev_priv->irq_mask = ~display_mask;
2837
2838         /* should always can generate irq */
2839         I915_WRITE(DEIIR, I915_READ(DEIIR));
2840         I915_WRITE(DEIMR, dev_priv->irq_mask);
2841         I915_WRITE(DEIER, display_mask | extra_mask);
2842         POSTING_READ(DEIER);
2843
2844         gen5_gt_irq_postinstall(dev);
2845
2846         ibx_irq_postinstall(dev);
2847
2848         if (IS_IRONLAKE_M(dev)) {
2849                 /* Enable PCU event interrupts
2850                  *
2851                  * spinlocking not required here for correctness since interrupt
2852                  * setup is guaranteed to run in single-threaded context. But we
2853                  * need it to make the assert_spin_locked happy. */
2854                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2855                 ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);
2856                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2857         }
2858
2859         return 0;
2860 }
2861
2862 static int valleyview_irq_postinstall(struct drm_device *dev)
2863 {
2864         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2865         u32 enable_mask;
2866         u32 pipestat_enable = PLANE_FLIP_DONE_INT_EN_VLV |
2867                 PIPE_CRC_DONE_ENABLE;
2868
2869         enable_mask = I915_DISPLAY_PORT_INTERRUPT;
2870         enable_mask |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
2871                 I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
2872                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
2873                 I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2874
2875         /*
2876          *Leave vblank interrupts masked initially.  enable/disable will
2877          * toggle them based on usage.
2878          */
2879         dev_priv->irq_mask = (~enable_mask) |
2880                 I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
2881                 I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2882
2883         I915_WRITE(PORT_HOTPLUG_EN, 0);
2884         POSTING_READ(PORT_HOTPLUG_EN);
2885
2886         I915_WRITE(VLV_IMR, dev_priv->irq_mask);
2887         I915_WRITE(VLV_IER, enable_mask);
2888         I915_WRITE(VLV_IIR, 0xffffffff);
2889         I915_WRITE(PIPESTAT(0), 0xffff);
2890         I915_WRITE(PIPESTAT(1), 0xffff);
2891         POSTING_READ(VLV_IER);
2892
2893         /* Interrupt setup is already guaranteed to be single-threaded, this is
2894          * just to make the assert_spin_locked check happy. */
2895         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
2896         i915_enable_pipestat(dev_priv, PIPE_A, pipestat_enable);
2897         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_EVENT_ENABLE);
2898         i915_enable_pipestat(dev_priv, PIPE_B, pipestat_enable);
2899         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
2900
2901         I915_WRITE(VLV_IIR, 0xffffffff);
2902         I915_WRITE(VLV_IIR, 0xffffffff);
2903
2904         gen5_gt_irq_postinstall(dev);
2905
2906         /* ack & enable invalid PTE error interrupts */
2907 #if 0 /* FIXME: add support to irq handler for checking these bits */
2908         I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK);
2909         I915_WRITE(DPINVGTT, DPINVGTT_EN_MASK);
2910 #endif
2911
2912         I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
2913
2914         return 0;
2915 }
2916
2917 static void gen8_gt_irq_postinstall(struct drm_i915_private *dev_priv)
2918 {
2919         int i;
2920
2921         /* These are interrupts we'll toggle with the ring mask register */
2922         uint32_t gt_interrupts[] = {
2923                 GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT |
2924                         GT_RENDER_L3_PARITY_ERROR_INTERRUPT |
2925                         GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT,
2926                 GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT |
2927                         GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT,
2928                 0,
2929                 GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT
2930                 };
2931
2932         for (i = 0; i < ARRAY_SIZE(gt_interrupts); i++) {
2933                 u32 tmp = I915_READ(GEN8_GT_IIR(i));
2934                 if (tmp)
2935                         DRM_ERROR("Interrupt (%d) should have been masked in pre-install 0x%08x\n",
2936                                   i, tmp);
2937                 I915_WRITE(GEN8_GT_IMR(i), ~gt_interrupts[i]);
2938                 I915_WRITE(GEN8_GT_IER(i), gt_interrupts[i]);
2939         }
2940         POSTING_READ(GEN8_GT_IER(0));
2941 }
2942
2943 static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
2944 {
2945         struct drm_device *dev = dev_priv->dev;
2946         uint32_t de_pipe_masked = GEN8_PIPE_FLIP_DONE |
2947                 GEN8_PIPE_CDCLK_CRC_DONE |
2948                 GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
2949         uint32_t de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
2950                 GEN8_PIPE_FIFO_UNDERRUN;
2951         int pipe;
2952         dev_priv->de_irq_mask[PIPE_A] = ~de_pipe_masked;
2953         dev_priv->de_irq_mask[PIPE_B] = ~de_pipe_masked;
2954         dev_priv->de_irq_mask[PIPE_C] = ~de_pipe_masked;
2955
2956         for_each_pipe(pipe) {
2957                 u32 tmp = I915_READ(GEN8_DE_PIPE_IIR(pipe));
2958                 if (tmp)
2959                         DRM_ERROR("Interrupt (%d) should have been masked in pre-install 0x%08x\n",
2960                                   pipe, tmp);
2961                 I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
2962                 I915_WRITE(GEN8_DE_PIPE_IER(pipe), de_pipe_enables);
2963         }
2964         POSTING_READ(GEN8_DE_PIPE_ISR(0));
2965
2966         I915_WRITE(GEN8_DE_PORT_IMR, ~GEN8_AUX_CHANNEL_A);
2967         I915_WRITE(GEN8_DE_PORT_IER, GEN8_AUX_CHANNEL_A);
2968         POSTING_READ(GEN8_DE_PORT_IER);
2969 }
2970
2971 static int gen8_irq_postinstall(struct drm_device *dev)
2972 {
2973         struct drm_i915_private *dev_priv = dev->dev_private;
2974
2975         gen8_gt_irq_postinstall(dev_priv);
2976         gen8_de_irq_postinstall(dev_priv);
2977
2978         ibx_irq_postinstall(dev);
2979
2980         I915_WRITE(GEN8_MASTER_IRQ, DE_MASTER_IRQ_CONTROL);
2981         POSTING_READ(GEN8_MASTER_IRQ);
2982
2983         return 0;
2984 }
2985
2986 static void gen8_irq_uninstall(struct drm_device *dev)
2987 {
2988         struct drm_i915_private *dev_priv = dev->dev_private;
2989         int pipe;
2990
2991         if (!dev_priv)
2992                 return;
2993
2994         atomic_set(&dev_priv->irq_received, 0);
2995
2996         I915_WRITE(GEN8_MASTER_IRQ, 0);
2997
2998 #define GEN8_IRQ_FINI_NDX(type, which) do { \
2999                 I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
3000                 I915_WRITE(GEN8_##type##_IER(which), 0); \
3001                 I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
3002         } while (0)
3003
3004 #define GEN8_IRQ_FINI(type) do { \
3005                 I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
3006                 I915_WRITE(GEN8_##type##_IER, 0); \
3007                 I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
3008         } while (0)
3009
3010         GEN8_IRQ_FINI_NDX(GT, 0);
3011         GEN8_IRQ_FINI_NDX(GT, 1);
3012         GEN8_IRQ_FINI_NDX(GT, 2);
3013         GEN8_IRQ_FINI_NDX(GT, 3);
3014
3015         for_each_pipe(pipe) {
3016                 GEN8_IRQ_FINI_NDX(DE_PIPE, pipe);
3017         }
3018
3019         GEN8_IRQ_FINI(DE_PORT);
3020         GEN8_IRQ_FINI(DE_MISC);
3021         GEN8_IRQ_FINI(PCU);
3022 #undef GEN8_IRQ_FINI
3023 #undef GEN8_IRQ_FINI_NDX
3024
3025         POSTING_READ(GEN8_PCU_IIR);
3026 }
3027
3028 static void valleyview_irq_uninstall(struct drm_device *dev)
3029 {
3030         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3031         int pipe;
3032
3033         if (!dev_priv)
3034                 return;
3035
3036         del_timer_sync(&dev_priv->hotplug_reenable_timer);
3037
3038         for_each_pipe(pipe)
3039                 I915_WRITE(PIPESTAT(pipe), 0xffff);
3040
3041         I915_WRITE(HWSTAM, 0xffffffff);
3042         I915_WRITE(PORT_HOTPLUG_EN, 0);
3043         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3044         for_each_pipe(pipe)
3045                 I915_WRITE(PIPESTAT(pipe), 0xffff);
3046         I915_WRITE(VLV_IIR, 0xffffffff);
3047         I915_WRITE(VLV_IMR, 0xffffffff);
3048         I915_WRITE(VLV_IER, 0x0);
3049         POSTING_READ(VLV_IER);
3050 }
3051
3052 static void ironlake_irq_uninstall(struct drm_device *dev)
3053 {
3054         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3055
3056         if (!dev_priv)
3057                 return;
3058
3059         del_timer_sync(&dev_priv->hotplug_reenable_timer);
3060
3061         I915_WRITE(HWSTAM, 0xffffffff);
3062
3063         I915_WRITE(DEIMR, 0xffffffff);
3064         I915_WRITE(DEIER, 0x0);
3065         I915_WRITE(DEIIR, I915_READ(DEIIR));
3066         if (IS_GEN7(dev))
3067                 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
3068
3069         I915_WRITE(GTIMR, 0xffffffff);
3070         I915_WRITE(GTIER, 0x0);
3071         I915_WRITE(GTIIR, I915_READ(GTIIR));
3072
3073         if (HAS_PCH_NOP(dev))
3074                 return;
3075
3076         I915_WRITE(SDEIMR, 0xffffffff);
3077         I915_WRITE(SDEIER, 0x0);
3078         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
3079         if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
3080                 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
3081 }
3082
3083 static void i8xx_irq_preinstall(struct drm_device * dev)
3084 {
3085         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3086         int pipe;
3087
3088         atomic_set(&dev_priv->irq_received, 0);
3089
3090         for_each_pipe(pipe)
3091                 I915_WRITE(PIPESTAT(pipe), 0);
3092         I915_WRITE16(IMR, 0xffff);
3093         I915_WRITE16(IER, 0x0);
3094         POSTING_READ16(IER);
3095 }
3096
3097 static int i8xx_irq_postinstall(struct drm_device *dev)
3098 {
3099         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3100
3101         I915_WRITE16(EMR,
3102                      ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
3103
3104         /* Unmask the interrupts that we always want on. */
3105         dev_priv->irq_mask =
3106                 ~(I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3107                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3108                   I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3109                   I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3110                   I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3111         I915_WRITE16(IMR, dev_priv->irq_mask);
3112
3113         I915_WRITE16(IER,
3114                      I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3115                      I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3116                      I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
3117                      I915_USER_INTERRUPT);
3118         POSTING_READ16(IER);
3119
3120         /* Interrupt setup is already guaranteed to be single-threaded, this is
3121          * just to make the assert_spin_locked check happy. */
3122         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3123         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_ENABLE);
3124         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_ENABLE);
3125         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3126
3127         return 0;
3128 }
3129
3130 /*
3131  * Returns true when a page flip has completed.
3132  */
3133 static bool i8xx_handle_vblank(struct drm_device *dev,
3134                                int plane, int pipe, u32 iir)
3135 {
3136         drm_i915_private_t *dev_priv = dev->dev_private;
3137         u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
3138
3139         if (!drm_handle_vblank(dev, pipe))
3140                 return false;
3141
3142         if ((iir & flip_pending) == 0)
3143                 return false;
3144
3145         intel_prepare_page_flip(dev, plane);
3146
3147         /* We detect FlipDone by looking for the change in PendingFlip from '1'
3148          * to '0' on the following vblank, i.e. IIR has the Pendingflip
3149          * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
3150          * the flip is completed (no longer pending). Since this doesn't raise
3151          * an interrupt per se, we watch for the change at vblank.
3152          */
3153         if (I915_READ16(ISR) & flip_pending)
3154                 return false;
3155
3156         intel_finish_page_flip(dev, pipe);
3157
3158         return true;
3159 }
3160
3161 static irqreturn_t i8xx_irq_handler(void *arg)
3162 {
3163         struct drm_device *dev = (struct drm_device *) arg;
3164         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3165         u16 iir, new_iir;
3166         u32 pipe_stats[2];
3167         int pipe;
3168         u16 flip_mask =
3169                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3170                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3171
3172         atomic_inc(&dev_priv->irq_received);
3173
3174         iir = I915_READ16(IIR);
3175         if (iir == 0)
3176                 return;
3177
3178         while (iir & ~flip_mask) {
3179                 /* Can't rely on pipestat interrupt bit in iir as it might
3180                  * have been cleared after the pipestat interrupt was received.
3181                  * It doesn't set the bit in iir again, but it still produces
3182                  * interrupts (for non-MSI).
3183                  */
3184                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3185                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3186                         i915_handle_error(dev, false);
3187
3188                 for_each_pipe(pipe) {
3189                         int reg = PIPESTAT(pipe);
3190                         pipe_stats[pipe] = I915_READ(reg);
3191
3192                         /*
3193                          * Clear the PIPE*STAT regs before the IIR
3194                          */
3195                         if (pipe_stats[pipe] & 0x8000ffff) {
3196                                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3197                                         DRM_DEBUG_DRIVER("pipe %c underrun\n",
3198                                                          pipe_name(pipe));
3199                                 I915_WRITE(reg, pipe_stats[pipe]);
3200                         }
3201                 }
3202                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3203
3204                 I915_WRITE16(IIR, iir & ~flip_mask);
3205                 new_iir = I915_READ16(IIR); /* Flush posted writes */
3206
3207                 i915_update_dri1_breadcrumb(dev);
3208
3209                 if (iir & I915_USER_INTERRUPT)
3210                         notify_ring(dev, &dev_priv->ring[RCS]);
3211
3212                 for_each_pipe(pipe) {
3213                         int plane = pipe;
3214                         if (HAS_FBC(dev))
3215                                 plane = !plane;
3216
3217                         if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
3218                             i8xx_handle_vblank(dev, plane, pipe, iir))
3219                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
3220
3221                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3222                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3223                 }
3224
3225                 iir = new_iir;
3226         }
3227
3228 }
3229
3230 static void i8xx_irq_uninstall(struct drm_device * dev)
3231 {
3232         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3233         int pipe;
3234
3235         for_each_pipe(pipe) {
3236                 /* Clear enable bits; then clear status bits */
3237                 I915_WRITE(PIPESTAT(pipe), 0);
3238                 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3239         }
3240         I915_WRITE16(IMR, 0xffff);
3241         I915_WRITE16(IER, 0x0);
3242         I915_WRITE16(IIR, I915_READ16(IIR));
3243 }
3244
3245 static void i915_irq_preinstall(struct drm_device * dev)
3246 {
3247         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3248         int pipe;
3249
3250         atomic_set(&dev_priv->irq_received, 0);
3251
3252         if (I915_HAS_HOTPLUG(dev)) {
3253                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3254                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3255         }
3256
3257         I915_WRITE16(HWSTAM, 0xeffe);
3258         for_each_pipe(pipe)
3259                 I915_WRITE(PIPESTAT(pipe), 0);
3260         I915_WRITE(IMR, 0xffffffff);
3261         I915_WRITE(IER, 0x0);
3262         POSTING_READ(IER);
3263 }
3264
3265 static int i915_irq_postinstall(struct drm_device *dev)
3266 {
3267         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3268         u32 enable_mask;
3269
3270         I915_WRITE(EMR, ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
3271
3272         /* Unmask the interrupts that we always want on. */
3273         dev_priv->irq_mask =
3274                 ~(I915_ASLE_INTERRUPT |
3275                   I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3276                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3277                   I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3278                   I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3279                   I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3280
3281         enable_mask =
3282                 I915_ASLE_INTERRUPT |
3283                 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3284                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3285                 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
3286                 I915_USER_INTERRUPT;
3287
3288         if (I915_HAS_HOTPLUG(dev)) {
3289                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3290                 POSTING_READ(PORT_HOTPLUG_EN);
3291
3292                 /* Enable in IER... */
3293                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
3294                 /* and unmask in IMR */
3295                 dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
3296         }
3297
3298         I915_WRITE(IMR, dev_priv->irq_mask);
3299         I915_WRITE(IER, enable_mask);
3300         POSTING_READ(IER);
3301
3302         i915_enable_asle_pipestat(dev);
3303
3304         /* Interrupt setup is already guaranteed to be single-threaded, this is
3305          * just to make the assert_spin_locked check happy. */
3306         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3307         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_ENABLE);
3308         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_ENABLE);
3309         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3310
3311         return 0;
3312 }
3313
3314 /*
3315  * Returns true when a page flip has completed.
3316  */
3317 static bool i915_handle_vblank(struct drm_device *dev,
3318                                int plane, int pipe, u32 iir)
3319 {
3320         drm_i915_private_t *dev_priv = dev->dev_private;
3321         u32 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
3322
3323         if (!drm_handle_vblank(dev, pipe))
3324                 return false;
3325
3326         if ((iir & flip_pending) == 0)
3327                 return false;
3328
3329         intel_prepare_page_flip(dev, plane);
3330
3331         /* We detect FlipDone by looking for the change in PendingFlip from '1'
3332          * to '0' on the following vblank, i.e. IIR has the Pendingflip
3333          * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
3334          * the flip is completed (no longer pending). Since this doesn't raise
3335          * an interrupt per se, we watch for the change at vblank.
3336          */
3337         if (I915_READ(ISR) & flip_pending)
3338                 return false;
3339
3340         intel_finish_page_flip(dev, pipe);
3341
3342         return true;
3343 }
3344
3345 static irqreturn_t i915_irq_handler(void *arg)
3346 {
3347         struct drm_device *dev = (struct drm_device *) arg;
3348         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3349         u32 iir, new_iir, pipe_stats[I915_MAX_PIPES];
3350         u32 flip_mask =
3351                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3352                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3353         int pipe;
3354
3355         atomic_inc(&dev_priv->irq_received);
3356
3357         iir = I915_READ(IIR);
3358         do {
3359                 bool irq_received = (iir & ~flip_mask) != 0;
3360                 bool blc_event = false;
3361
3362                 /* Can't rely on pipestat interrupt bit in iir as it might
3363                  * have been cleared after the pipestat interrupt was received.
3364                  * It doesn't set the bit in iir again, but it still produces
3365                  * interrupts (for non-MSI).
3366                  */
3367                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3368                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3369                         i915_handle_error(dev, false);
3370
3371                 for_each_pipe(pipe) {
3372                         int reg = PIPESTAT(pipe);
3373                         pipe_stats[pipe] = I915_READ(reg);
3374
3375                         /* Clear the PIPE*STAT regs before the IIR */
3376                         if (pipe_stats[pipe] & 0x8000ffff) {
3377                                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3378                                         DRM_DEBUG_DRIVER("pipe %c underrun\n",
3379                                                          pipe_name(pipe));
3380                                 I915_WRITE(reg, pipe_stats[pipe]);
3381                                 irq_received = true;
3382                         }
3383                 }
3384                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3385
3386                 if (!irq_received)
3387                         break;
3388
3389                 /* Consume port.  Then clear IIR or we'll miss events */
3390                 if ((I915_HAS_HOTPLUG(dev)) &&
3391                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
3392                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3393                         u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
3394
3395                         DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
3396                                   hotplug_status);
3397
3398                         intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
3399
3400                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3401                         POSTING_READ(PORT_HOTPLUG_STAT);
3402                 }
3403
3404                 I915_WRITE(IIR, iir & ~flip_mask);
3405                 new_iir = I915_READ(IIR); /* Flush posted writes */
3406
3407                 if (iir & I915_USER_INTERRUPT)
3408                         notify_ring(dev, &dev_priv->ring[RCS]);
3409
3410                 for_each_pipe(pipe) {
3411                         int plane = pipe;
3412                         if (HAS_FBC(dev))
3413                                 plane = !plane;
3414
3415                         if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
3416                             i915_handle_vblank(dev, plane, pipe, iir))
3417                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
3418
3419                         if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3420                                 blc_event = true;
3421
3422                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3423                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3424                 }
3425
3426                 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3427                         intel_opregion_asle_intr(dev);
3428
3429                 /* With MSI, interrupts are only generated when iir
3430                  * transitions from zero to nonzero.  If another bit got
3431                  * set while we were handling the existing iir bits, then
3432                  * we would never get another interrupt.
3433                  *
3434                  * This is fine on non-MSI as well, as if we hit this path
3435                  * we avoid exiting the interrupt handler only to generate
3436                  * another one.
3437                  *
3438                  * Note that for MSI this could cause a stray interrupt report
3439                  * if an interrupt landed in the time between writing IIR and
3440                  * the posting read.  This should be rare enough to never
3441                  * trigger the 99% of 100,000 interrupts test for disabling
3442                  * stray interrupts.
3443                  */
3444                 iir = new_iir;
3445         } while (iir & ~flip_mask);
3446
3447         i915_update_dri1_breadcrumb(dev);
3448
3449 }
3450
3451 static void i915_irq_uninstall(struct drm_device * dev)
3452 {
3453         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3454         int pipe;
3455
3456         del_timer_sync(&dev_priv->hotplug_reenable_timer);
3457
3458         if (I915_HAS_HOTPLUG(dev)) {
3459                 I915_WRITE(PORT_HOTPLUG_EN, 0);
3460                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3461         }
3462
3463         I915_WRITE16(HWSTAM, 0xffff);
3464         for_each_pipe(pipe) {
3465                 /* Clear enable bits; then clear status bits */
3466                 I915_WRITE(PIPESTAT(pipe), 0);
3467                 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3468         }
3469         I915_WRITE(IMR, 0xffffffff);
3470         I915_WRITE(IER, 0x0);
3471
3472         I915_WRITE(IIR, I915_READ(IIR));
3473 }
3474
3475 static void i965_irq_preinstall(struct drm_device * dev)
3476 {
3477         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3478         int pipe;
3479
3480         atomic_set(&dev_priv->irq_received, 0);
3481
3482         I915_WRITE(PORT_HOTPLUG_EN, 0);
3483         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3484
3485         I915_WRITE(HWSTAM, 0xeffe);
3486         for_each_pipe(pipe)
3487                 I915_WRITE(PIPESTAT(pipe), 0);
3488         I915_WRITE(IMR, 0xffffffff);
3489         I915_WRITE(IER, 0x0);
3490         POSTING_READ(IER);
3491 }
3492
3493 static int i965_irq_postinstall(struct drm_device *dev)
3494 {
3495         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3496         u32 enable_mask;
3497         u32 error_mask;
3498
3499         /* Unmask the interrupts that we always want on. */
3500         dev_priv->irq_mask = ~(I915_ASLE_INTERRUPT |
3501                                I915_DISPLAY_PORT_INTERRUPT |
3502                                I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3503                                I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3504                                I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3505                                I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3506                                I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3507
3508         enable_mask = ~dev_priv->irq_mask;
3509         enable_mask &= ~(I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3510                          I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT);
3511         enable_mask |= I915_USER_INTERRUPT;
3512
3513         if (IS_G4X(dev))
3514                 enable_mask |= I915_BSD_USER_INTERRUPT;
3515
3516         /* Interrupt setup is already guaranteed to be single-threaded, this is
3517          * just to make the assert_spin_locked check happy. */
3518         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3519         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_EVENT_ENABLE);
3520         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_ENABLE);
3521         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_ENABLE);
3522         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3523
3524         /*
3525          * Enable some error detection, note the instruction error mask
3526          * bit is reserved, so we leave it masked.
3527          */
3528         if (IS_G4X(dev)) {
3529                 error_mask = ~(GM45_ERROR_PAGE_TABLE |
3530                                GM45_ERROR_MEM_PRIV |
3531                                GM45_ERROR_CP_PRIV |
3532                                I915_ERROR_MEMORY_REFRESH);
3533         } else {
3534                 error_mask = ~(I915_ERROR_PAGE_TABLE |
3535                                I915_ERROR_MEMORY_REFRESH);
3536         }
3537         I915_WRITE(EMR, error_mask);
3538
3539         I915_WRITE(IMR, dev_priv->irq_mask);
3540         I915_WRITE(IER, enable_mask);
3541         POSTING_READ(IER);
3542
3543         I915_WRITE(PORT_HOTPLUG_EN, 0);
3544         POSTING_READ(PORT_HOTPLUG_EN);
3545
3546         i915_enable_asle_pipestat(dev);
3547
3548         return 0;
3549 }
3550
3551 static void i915_hpd_irq_setup(struct drm_device *dev)
3552 {
3553         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3554         struct drm_mode_config *mode_config = &dev->mode_config;
3555         struct intel_encoder *intel_encoder;
3556         u32 hotplug_en;
3557
3558         assert_spin_locked(&dev_priv->irq_lock);
3559
3560         if (I915_HAS_HOTPLUG(dev)) {
3561                 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
3562                 hotplug_en &= ~HOTPLUG_INT_EN_MASK;
3563                 /* Note HDMI and DP share hotplug bits */
3564                 /* enable bits are the same for all generations */
3565                 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
3566                         if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
3567                                 hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin];
3568                 /* Programming the CRT detection parameters tends
3569                    to generate a spurious hotplug event about three
3570                    seconds later.  So just do it once.
3571                 */
3572                 if (IS_G4X(dev))
3573                         hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
3574                 hotplug_en &= ~CRT_HOTPLUG_VOLTAGE_COMPARE_MASK;
3575                 hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
3576
3577                 /* Ignore TV since it's buggy */
3578                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
3579         }
3580 }
3581
3582 static irqreturn_t i965_irq_handler(void *arg)
3583 {
3584         struct drm_device *dev = (struct drm_device *) arg;
3585         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3586         u32 iir, new_iir;
3587         u32 pipe_stats[I915_MAX_PIPES];
3588         int irq_received;
3589         int pipe;
3590         u32 flip_mask =
3591                 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3592                 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3593
3594         atomic_inc(&dev_priv->irq_received);
3595
3596         iir = I915_READ(IIR);
3597
3598         for (;;) {
3599                 bool blc_event = false;
3600
3601                 irq_received = (iir & ~flip_mask) != 0;
3602
3603                 /* Can't rely on pipestat interrupt bit in iir as it might
3604                  * have been cleared after the pipestat interrupt was received.
3605                  * It doesn't set the bit in iir again, but it still produces
3606                  * interrupts (for non-MSI).
3607                  */
3608                 lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3609                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3610                         i915_handle_error(dev, false);
3611
3612                 for_each_pipe(pipe) {
3613                         int reg = PIPESTAT(pipe);
3614                         pipe_stats[pipe] = I915_READ(reg);
3615
3616                         /*
3617                          * Clear the PIPE*STAT regs before the IIR
3618                          */
3619                         if (pipe_stats[pipe] & 0x8000ffff) {
3620                                 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3621                                         DRM_DEBUG_DRIVER("pipe %c underrun\n",
3622                                                          pipe_name(pipe));
3623                                 I915_WRITE(reg, pipe_stats[pipe]);
3624                                 irq_received = 1;
3625                         }
3626                 }
3627                 lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3628
3629                 if (!irq_received)
3630                         break;
3631
3632
3633                 /* Consume port.  Then clear IIR or we'll miss events */
3634                 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
3635                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3636                         u32 hotplug_trigger = hotplug_status & (IS_G4X(dev) ?
3637                                                                   HOTPLUG_INT_STATUS_G4X :
3638                                                                   HOTPLUG_INT_STATUS_I915);
3639
3640                         DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
3641                                   hotplug_status);
3642
3643                         intel_hpd_irq_handler(dev, hotplug_trigger,
3644                                               IS_G4X(dev) ? hpd_status_g4x : hpd_status_i915);
3645
3646                         if (IS_G4X(dev) &&
3647                             (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X))
3648                                 dp_aux_irq_handler(dev);
3649
3650                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3651                         I915_READ(PORT_HOTPLUG_STAT);
3652                 }
3653
3654                 I915_WRITE(IIR, iir & ~flip_mask);
3655                 new_iir = I915_READ(IIR); /* Flush posted writes */
3656
3657                 if (iir & I915_USER_INTERRUPT)
3658                         notify_ring(dev, &dev_priv->ring[RCS]);
3659                 if (iir & I915_BSD_USER_INTERRUPT)
3660                         notify_ring(dev, &dev_priv->ring[VCS]);
3661
3662                 for_each_pipe(pipe) {
3663                         if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
3664                             i915_handle_vblank(dev, pipe, pipe, iir))
3665                                 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe);
3666
3667                         if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3668                                 blc_event = true;
3669
3670                         if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
3671                                 i9xx_pipe_crc_irq_handler(dev, pipe);
3672                 }
3673
3674
3675                 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3676                         intel_opregion_asle_intr(dev);
3677
3678                 if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
3679                         gmbus_irq_handler(dev);
3680
3681                 /* With MSI, interrupts are only generated when iir
3682                  * transitions from zero to nonzero.  If another bit got
3683                  * set while we were handling the existing iir bits, then
3684                  * we would never get another interrupt.
3685                  *
3686                  * This is fine on non-MSI as well, as if we hit this path
3687                  * we avoid exiting the interrupt handler only to generate
3688                  * another one.
3689                  *
3690                  * Note that for MSI this could cause a stray interrupt report
3691                  * if an interrupt landed in the time between writing IIR and
3692                  * the posting read.  This should be rare enough to never
3693                  * trigger the 99% of 100,000 interrupts test for disabling
3694                  * stray interrupts.
3695                  */
3696                 iir = new_iir;
3697         }
3698
3699         i915_update_dri1_breadcrumb(dev);
3700
3701 }
3702
3703 static void i965_irq_uninstall(struct drm_device * dev)
3704 {
3705         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3706         int pipe;
3707
3708         if (!dev_priv)
3709                 return;
3710
3711         del_timer_sync(&dev_priv->hotplug_reenable_timer);
3712
3713         I915_WRITE(PORT_HOTPLUG_EN, 0);
3714         I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3715
3716         I915_WRITE(HWSTAM, 0xffffffff);
3717         for_each_pipe(pipe)
3718                 I915_WRITE(PIPESTAT(pipe), 0);
3719         I915_WRITE(IMR, 0xffffffff);
3720         I915_WRITE(IER, 0x0);
3721
3722         for_each_pipe(pipe)
3723                 I915_WRITE(PIPESTAT(pipe),
3724                            I915_READ(PIPESTAT(pipe)) & 0x8000ffff);
3725         I915_WRITE(IIR, I915_READ(IIR));
3726 }
3727
3728 static void i915_reenable_hotplug_timer_func(unsigned long data)
3729 {
3730         drm_i915_private_t *dev_priv = (drm_i915_private_t *)data;
3731         struct drm_device *dev = dev_priv->dev;
3732         struct drm_mode_config *mode_config = &dev->mode_config;
3733         int i;
3734
3735         lockmgr(&dev_priv->irq_lock, LK_EXCLUSIVE);
3736         for (i = (HPD_NONE + 1); i < HPD_NUM_PINS; i++) {
3737                 struct drm_connector *connector;
3738
3739                 if (dev_priv->hpd_stats[i].hpd_mark != HPD_DISABLED)
3740                         continue;
3741
3742                 dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED;
3743
3744                 list_for_each_entry(connector, &mode_config->connector_list, head) {
3745                         struct intel_connector *intel_connector = to_intel_connector(connector);
3746
3747                         if (intel_connector->encoder->hpd_pin == i) {
3748                                 if (connector->polled != intel_connector->polled)
3749                                         DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
3750                                                          drm_get_connector_name(connector));
3751                                 connector->polled = intel_connector->polled;
3752                                 if (!connector->polled)
3753                                         connector->polled = DRM_CONNECTOR_POLL_HPD;
3754                         }
3755                 }
3756         }
3757         if (dev_priv->display.hpd_irq_setup)
3758                 dev_priv->display.hpd_irq_setup(dev);
3759         lockmgr(&dev_priv->irq_lock, LK_RELEASE);
3760 }
3761
3762 void intel_irq_init(struct drm_device *dev)
3763 {
3764         struct drm_i915_private *dev_priv = dev->dev_private;
3765
3766         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
3767         INIT_WORK(&dev_priv->gpu_error.work, i915_error_work_func);
3768         INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
3769         INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
3770
3771         setup_timer(&dev_priv->gpu_error.hangcheck_timer,
3772                     i915_hangcheck_elapsed,
3773                     (unsigned long) dev);
3774         setup_timer(&dev_priv->hotplug_reenable_timer, i915_reenable_hotplug_timer_func,
3775                     (unsigned long) dev_priv);
3776
3777         pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
3778
3779         if (IS_GEN2(dev)) {
3780                 dev->max_vblank_count = 0;
3781                 dev->driver->get_vblank_counter = i8xx_get_vblank_counter;
3782         } else if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
3783                 dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
3784                 dev->driver->get_vblank_counter = gm45_get_vblank_counter;
3785         } else {
3786                 dev->driver->get_vblank_counter = i915_get_vblank_counter;
3787                 dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
3788         }
3789
3790         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
3791                 dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
3792                 dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
3793         }
3794
3795         if (IS_VALLEYVIEW(dev)) {
3796                 dev->driver->irq_handler = valleyview_irq_handler;