xref: /openbmc/linux/drivers/gpu/drm/i915/i915_irq.c (revision 81d67439)
1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
2  */
3 /*
4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5  * All Rights Reserved.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the
9  * "Software"), to deal in the Software without restriction, including
10  * without limitation the rights to use, copy, modify, merge, publish,
11  * distribute, sub license, and/or sell copies of the Software, and to
12  * permit persons to whom the Software is furnished to do so, subject to
13  * the following conditions:
14  *
15  * The above copyright notice and this permission notice (including the
16  * next paragraph) shall be included in all copies or substantial portions
17  * of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  *
27  */
28 
29 #include <linux/sysrq.h>
30 #include <linux/slab.h>
31 #include "drmP.h"
32 #include "drm.h"
33 #include "i915_drm.h"
34 #include "i915_drv.h"
35 #include "i915_trace.h"
36 #include "intel_drv.h"
37 
38 #define MAX_NOPID ((u32)~0)
39 
40 /**
41  * Interrupts that are always left unmasked.
42  *
43  * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
44  * we leave them always unmasked in IMR and then control enabling them through
45  * PIPESTAT alone.
46  */
47 #define I915_INTERRUPT_ENABLE_FIX			\
48 	(I915_ASLE_INTERRUPT |				\
49 	 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |		\
50 	 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |		\
51 	 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |	\
52 	 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |	\
53 	 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
54 
55 /** Interrupts that we mask and unmask at runtime. */
56 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT | I915_BSD_USER_INTERRUPT)
57 
58 #define I915_PIPE_VBLANK_STATUS	(PIPE_START_VBLANK_INTERRUPT_STATUS |\
59 				 PIPE_VBLANK_INTERRUPT_STATUS)
60 
61 #define I915_PIPE_VBLANK_ENABLE	(PIPE_START_VBLANK_INTERRUPT_ENABLE |\
62 				 PIPE_VBLANK_INTERRUPT_ENABLE)
63 
64 #define DRM_I915_VBLANK_PIPE_ALL	(DRM_I915_VBLANK_PIPE_A | \
65 					 DRM_I915_VBLANK_PIPE_B)
66 
67 /* For display hotplug interrupt */
68 static void
69 ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
70 {
71 	if ((dev_priv->irq_mask & mask) != 0) {
72 		dev_priv->irq_mask &= ~mask;
73 		I915_WRITE(DEIMR, dev_priv->irq_mask);
74 		POSTING_READ(DEIMR);
75 	}
76 }
77 
78 static inline void
79 ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
80 {
81 	if ((dev_priv->irq_mask & mask) != mask) {
82 		dev_priv->irq_mask |= mask;
83 		I915_WRITE(DEIMR, dev_priv->irq_mask);
84 		POSTING_READ(DEIMR);
85 	}
86 }
87 
88 void
89 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
90 {
91 	if ((dev_priv->pipestat[pipe] & mask) != mask) {
92 		u32 reg = PIPESTAT(pipe);
93 
94 		dev_priv->pipestat[pipe] |= mask;
95 		/* Enable the interrupt, clear any pending status */
96 		I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
97 		POSTING_READ(reg);
98 	}
99 }
100 
101 void
102 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
103 {
104 	if ((dev_priv->pipestat[pipe] & mask) != 0) {
105 		u32 reg = PIPESTAT(pipe);
106 
107 		dev_priv->pipestat[pipe] &= ~mask;
108 		I915_WRITE(reg, dev_priv->pipestat[pipe]);
109 		POSTING_READ(reg);
110 	}
111 }
112 
113 /**
114  * intel_enable_asle - enable ASLE interrupt for OpRegion
115  */
116 void intel_enable_asle(struct drm_device *dev)
117 {
118 	drm_i915_private_t *dev_priv = dev->dev_private;
119 	unsigned long irqflags;
120 
121 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
122 
123 	if (HAS_PCH_SPLIT(dev))
124 		ironlake_enable_display_irq(dev_priv, DE_GSE);
125 	else {
126 		i915_enable_pipestat(dev_priv, 1,
127 				     PIPE_LEGACY_BLC_EVENT_ENABLE);
128 		if (INTEL_INFO(dev)->gen >= 4)
129 			i915_enable_pipestat(dev_priv, 0,
130 					     PIPE_LEGACY_BLC_EVENT_ENABLE);
131 	}
132 
133 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
134 }
135 
136 /**
137  * i915_pipe_enabled - check if a pipe is enabled
138  * @dev: DRM device
139  * @pipe: pipe to check
140  *
141  * Reading certain registers when the pipe is disabled can hang the chip.
142  * Use this routine to make sure the PLL is running and the pipe is active
143  * before reading such registers if unsure.
144  */
145 static int
146 i915_pipe_enabled(struct drm_device *dev, int pipe)
147 {
148 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
149 	return I915_READ(PIPECONF(pipe)) & PIPECONF_ENABLE;
150 }
151 
152 /* Called from drm generic code, passed a 'crtc', which
153  * we use as a pipe index
154  */
155 static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
156 {
157 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
158 	unsigned long high_frame;
159 	unsigned long low_frame;
160 	u32 high1, high2, low;
161 
162 	if (!i915_pipe_enabled(dev, pipe)) {
163 		DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
164 				"pipe %c\n", pipe_name(pipe));
165 		return 0;
166 	}
167 
168 	high_frame = PIPEFRAME(pipe);
169 	low_frame = PIPEFRAMEPIXEL(pipe);
170 
171 	/*
172 	 * High & low register fields aren't synchronized, so make sure
173 	 * we get a low value that's stable across two reads of the high
174 	 * register.
175 	 */
176 	do {
177 		high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
178 		low   = I915_READ(low_frame)  & PIPE_FRAME_LOW_MASK;
179 		high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
180 	} while (high1 != high2);
181 
182 	high1 >>= PIPE_FRAME_HIGH_SHIFT;
183 	low >>= PIPE_FRAME_LOW_SHIFT;
184 	return (high1 << 8) | low;
185 }
186 
187 static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
188 {
189 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
190 	int reg = PIPE_FRMCOUNT_GM45(pipe);
191 
192 	if (!i915_pipe_enabled(dev, pipe)) {
193 		DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
194 				 "pipe %c\n", pipe_name(pipe));
195 		return 0;
196 	}
197 
198 	return I915_READ(reg);
199 }
200 
201 static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
202 			     int *vpos, int *hpos)
203 {
204 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
205 	u32 vbl = 0, position = 0;
206 	int vbl_start, vbl_end, htotal, vtotal;
207 	bool in_vbl = true;
208 	int ret = 0;
209 
210 	if (!i915_pipe_enabled(dev, pipe)) {
211 		DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
212 				 "pipe %c\n", pipe_name(pipe));
213 		return 0;
214 	}
215 
216 	/* Get vtotal. */
217 	vtotal = 1 + ((I915_READ(VTOTAL(pipe)) >> 16) & 0x1fff);
218 
219 	if (INTEL_INFO(dev)->gen >= 4) {
220 		/* No obvious pixelcount register. Only query vertical
221 		 * scanout position from Display scan line register.
222 		 */
223 		position = I915_READ(PIPEDSL(pipe));
224 
225 		/* Decode into vertical scanout position. Don't have
226 		 * horizontal scanout position.
227 		 */
228 		*vpos = position & 0x1fff;
229 		*hpos = 0;
230 	} else {
231 		/* Have access to pixelcount since start of frame.
232 		 * We can split this into vertical and horizontal
233 		 * scanout position.
234 		 */
235 		position = (I915_READ(PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
236 
237 		htotal = 1 + ((I915_READ(HTOTAL(pipe)) >> 16) & 0x1fff);
238 		*vpos = position / htotal;
239 		*hpos = position - (*vpos * htotal);
240 	}
241 
242 	/* Query vblank area. */
243 	vbl = I915_READ(VBLANK(pipe));
244 
245 	/* Test position against vblank region. */
246 	vbl_start = vbl & 0x1fff;
247 	vbl_end = (vbl >> 16) & 0x1fff;
248 
249 	if ((*vpos < vbl_start) || (*vpos > vbl_end))
250 		in_vbl = false;
251 
252 	/* Inside "upper part" of vblank area? Apply corrective offset: */
253 	if (in_vbl && (*vpos >= vbl_start))
254 		*vpos = *vpos - vtotal;
255 
256 	/* Readouts valid? */
257 	if (vbl > 0)
258 		ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
259 
260 	/* In vblank? */
261 	if (in_vbl)
262 		ret |= DRM_SCANOUTPOS_INVBL;
263 
264 	return ret;
265 }
266 
267 static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
268 			      int *max_error,
269 			      struct timeval *vblank_time,
270 			      unsigned flags)
271 {
272 	struct drm_i915_private *dev_priv = dev->dev_private;
273 	struct drm_crtc *crtc;
274 
275 	if (pipe < 0 || pipe >= dev_priv->num_pipe) {
276 		DRM_ERROR("Invalid crtc %d\n", pipe);
277 		return -EINVAL;
278 	}
279 
280 	/* Get drm_crtc to timestamp: */
281 	crtc = intel_get_crtc_for_pipe(dev, pipe);
282 	if (crtc == NULL) {
283 		DRM_ERROR("Invalid crtc %d\n", pipe);
284 		return -EINVAL;
285 	}
286 
287 	if (!crtc->enabled) {
288 		DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
289 		return -EBUSY;
290 	}
291 
292 	/* Helper routine in DRM core does all the work: */
293 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
294 						     vblank_time, flags,
295 						     crtc);
296 }
297 
298 /*
299  * Handle hotplug events outside the interrupt handler proper.
300  */
301 static void i915_hotplug_work_func(struct work_struct *work)
302 {
303 	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
304 						    hotplug_work);
305 	struct drm_device *dev = dev_priv->dev;
306 	struct drm_mode_config *mode_config = &dev->mode_config;
307 	struct intel_encoder *encoder;
308 
309 	DRM_DEBUG_KMS("running encoder hotplug functions\n");
310 
311 	list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
312 		if (encoder->hot_plug)
313 			encoder->hot_plug(encoder);
314 
315 	/* Just fire off a uevent and let userspace tell us what to do */
316 	drm_helper_hpd_irq_event(dev);
317 }
318 
319 static void i915_handle_rps_change(struct drm_device *dev)
320 {
321 	drm_i915_private_t *dev_priv = dev->dev_private;
322 	u32 busy_up, busy_down, max_avg, min_avg;
323 	u8 new_delay = dev_priv->cur_delay;
324 
325 	I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
326 	busy_up = I915_READ(RCPREVBSYTUPAVG);
327 	busy_down = I915_READ(RCPREVBSYTDNAVG);
328 	max_avg = I915_READ(RCBMAXAVG);
329 	min_avg = I915_READ(RCBMINAVG);
330 
331 	/* Handle RCS change request from hw */
332 	if (busy_up > max_avg) {
333 		if (dev_priv->cur_delay != dev_priv->max_delay)
334 			new_delay = dev_priv->cur_delay - 1;
335 		if (new_delay < dev_priv->max_delay)
336 			new_delay = dev_priv->max_delay;
337 	} else if (busy_down < min_avg) {
338 		if (dev_priv->cur_delay != dev_priv->min_delay)
339 			new_delay = dev_priv->cur_delay + 1;
340 		if (new_delay > dev_priv->min_delay)
341 			new_delay = dev_priv->min_delay;
342 	}
343 
344 	if (ironlake_set_drps(dev, new_delay))
345 		dev_priv->cur_delay = new_delay;
346 
347 	return;
348 }
349 
350 static void notify_ring(struct drm_device *dev,
351 			struct intel_ring_buffer *ring)
352 {
353 	struct drm_i915_private *dev_priv = dev->dev_private;
354 	u32 seqno;
355 
356 	if (ring->obj == NULL)
357 		return;
358 
359 	seqno = ring->get_seqno(ring);
360 	trace_i915_gem_request_complete(ring, seqno);
361 
362 	ring->irq_seqno = seqno;
363 	wake_up_all(&ring->irq_queue);
364 
365 	dev_priv->hangcheck_count = 0;
366 	mod_timer(&dev_priv->hangcheck_timer,
367 		  jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
368 }
369 
370 static void gen6_pm_rps_work(struct work_struct *work)
371 {
372 	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
373 						    rps_work);
374 	u8 new_delay = dev_priv->cur_delay;
375 	u32 pm_iir, pm_imr;
376 
377 	spin_lock_irq(&dev_priv->rps_lock);
378 	pm_iir = dev_priv->pm_iir;
379 	dev_priv->pm_iir = 0;
380 	pm_imr = I915_READ(GEN6_PMIMR);
381 	spin_unlock_irq(&dev_priv->rps_lock);
382 
383 	if (!pm_iir)
384 		return;
385 
386 	mutex_lock(&dev_priv->dev->struct_mutex);
387 	if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
388 		if (dev_priv->cur_delay != dev_priv->max_delay)
389 			new_delay = dev_priv->cur_delay + 1;
390 		if (new_delay > dev_priv->max_delay)
391 			new_delay = dev_priv->max_delay;
392 	} else if (pm_iir & (GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT)) {
393 		gen6_gt_force_wake_get(dev_priv);
394 		if (dev_priv->cur_delay != dev_priv->min_delay)
395 			new_delay = dev_priv->cur_delay - 1;
396 		if (new_delay < dev_priv->min_delay) {
397 			new_delay = dev_priv->min_delay;
398 			I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
399 				   I915_READ(GEN6_RP_INTERRUPT_LIMITS) |
400 				   ((new_delay << 16) & 0x3f0000));
401 		} else {
402 			/* Make sure we continue to get down interrupts
403 			 * until we hit the minimum frequency */
404 			I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
405 				   I915_READ(GEN6_RP_INTERRUPT_LIMITS) & ~0x3f0000);
406 		}
407 		gen6_gt_force_wake_put(dev_priv);
408 	}
409 
410 	gen6_set_rps(dev_priv->dev, new_delay);
411 	dev_priv->cur_delay = new_delay;
412 
413 	/*
414 	 * rps_lock not held here because clearing is non-destructive. There is
415 	 * an *extremely* unlikely race with gen6_rps_enable() that is prevented
416 	 * by holding struct_mutex for the duration of the write.
417 	 */
418 	I915_WRITE(GEN6_PMIMR, pm_imr & ~pm_iir);
419 	mutex_unlock(&dev_priv->dev->struct_mutex);
420 }
421 
422 static void pch_irq_handler(struct drm_device *dev)
423 {
424 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
425 	u32 pch_iir;
426 	int pipe;
427 
428 	pch_iir = I915_READ(SDEIIR);
429 
430 	if (pch_iir & SDE_AUDIO_POWER_MASK)
431 		DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
432 				 (pch_iir & SDE_AUDIO_POWER_MASK) >>
433 				 SDE_AUDIO_POWER_SHIFT);
434 
435 	if (pch_iir & SDE_GMBUS)
436 		DRM_DEBUG_DRIVER("PCH GMBUS interrupt\n");
437 
438 	if (pch_iir & SDE_AUDIO_HDCP_MASK)
439 		DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
440 
441 	if (pch_iir & SDE_AUDIO_TRANS_MASK)
442 		DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
443 
444 	if (pch_iir & SDE_POISON)
445 		DRM_ERROR("PCH poison interrupt\n");
446 
447 	if (pch_iir & SDE_FDI_MASK)
448 		for_each_pipe(pipe)
449 			DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
450 					 pipe_name(pipe),
451 					 I915_READ(FDI_RX_IIR(pipe)));
452 
453 	if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
454 		DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
455 
456 	if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
457 		DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
458 
459 	if (pch_iir & SDE_TRANSB_FIFO_UNDER)
460 		DRM_DEBUG_DRIVER("PCH transcoder B underrun interrupt\n");
461 	if (pch_iir & SDE_TRANSA_FIFO_UNDER)
462 		DRM_DEBUG_DRIVER("PCH transcoder A underrun interrupt\n");
463 }
464 
465 static irqreturn_t ivybridge_irq_handler(DRM_IRQ_ARGS)
466 {
467 	struct drm_device *dev = (struct drm_device *) arg;
468 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
469 	int ret = IRQ_NONE;
470 	u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
471 	struct drm_i915_master_private *master_priv;
472 
473 	atomic_inc(&dev_priv->irq_received);
474 
475 	/* disable master interrupt before clearing iir  */
476 	de_ier = I915_READ(DEIER);
477 	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
478 	POSTING_READ(DEIER);
479 
480 	de_iir = I915_READ(DEIIR);
481 	gt_iir = I915_READ(GTIIR);
482 	pch_iir = I915_READ(SDEIIR);
483 	pm_iir = I915_READ(GEN6_PMIIR);
484 
485 	if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 && pm_iir == 0)
486 		goto done;
487 
488 	ret = IRQ_HANDLED;
489 
490 	if (dev->primary->master) {
491 		master_priv = dev->primary->master->driver_priv;
492 		if (master_priv->sarea_priv)
493 			master_priv->sarea_priv->last_dispatch =
494 				READ_BREADCRUMB(dev_priv);
495 	}
496 
497 	if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))
498 		notify_ring(dev, &dev_priv->ring[RCS]);
499 	if (gt_iir & GT_GEN6_BSD_USER_INTERRUPT)
500 		notify_ring(dev, &dev_priv->ring[VCS]);
501 	if (gt_iir & GT_BLT_USER_INTERRUPT)
502 		notify_ring(dev, &dev_priv->ring[BCS]);
503 
504 	if (de_iir & DE_GSE_IVB)
505 		intel_opregion_gse_intr(dev);
506 
507 	if (de_iir & DE_PLANEA_FLIP_DONE_IVB) {
508 		intel_prepare_page_flip(dev, 0);
509 		intel_finish_page_flip_plane(dev, 0);
510 	}
511 
512 	if (de_iir & DE_PLANEB_FLIP_DONE_IVB) {
513 		intel_prepare_page_flip(dev, 1);
514 		intel_finish_page_flip_plane(dev, 1);
515 	}
516 
517 	if (de_iir & DE_PIPEA_VBLANK_IVB)
518 		drm_handle_vblank(dev, 0);
519 
520 	if (de_iir & DE_PIPEB_VBLANK_IVB)
521 		drm_handle_vblank(dev, 1);
522 
523 	/* check event from PCH */
524 	if (de_iir & DE_PCH_EVENT_IVB) {
525 		if (pch_iir & SDE_HOTPLUG_MASK_CPT)
526 			queue_work(dev_priv->wq, &dev_priv->hotplug_work);
527 		pch_irq_handler(dev);
528 	}
529 
530 	if (pm_iir & GEN6_PM_DEFERRED_EVENTS) {
531 		unsigned long flags;
532 		spin_lock_irqsave(&dev_priv->rps_lock, flags);
533 		WARN(dev_priv->pm_iir & pm_iir, "Missed a PM interrupt\n");
534 		I915_WRITE(GEN6_PMIMR, pm_iir);
535 		dev_priv->pm_iir |= pm_iir;
536 		spin_unlock_irqrestore(&dev_priv->rps_lock, flags);
537 		queue_work(dev_priv->wq, &dev_priv->rps_work);
538 	}
539 
540 	/* should clear PCH hotplug event before clear CPU irq */
541 	I915_WRITE(SDEIIR, pch_iir);
542 	I915_WRITE(GTIIR, gt_iir);
543 	I915_WRITE(DEIIR, de_iir);
544 	I915_WRITE(GEN6_PMIIR, pm_iir);
545 
546 done:
547 	I915_WRITE(DEIER, de_ier);
548 	POSTING_READ(DEIER);
549 
550 	return ret;
551 }
552 
553 static irqreturn_t ironlake_irq_handler(DRM_IRQ_ARGS)
554 {
555 	struct drm_device *dev = (struct drm_device *) arg;
556 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
557 	int ret = IRQ_NONE;
558 	u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;
559 	u32 hotplug_mask;
560 	struct drm_i915_master_private *master_priv;
561 	u32 bsd_usr_interrupt = GT_BSD_USER_INTERRUPT;
562 
563 	atomic_inc(&dev_priv->irq_received);
564 
565 	if (IS_GEN6(dev))
566 		bsd_usr_interrupt = GT_GEN6_BSD_USER_INTERRUPT;
567 
568 	/* disable master interrupt before clearing iir  */
569 	de_ier = I915_READ(DEIER);
570 	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
571 	POSTING_READ(DEIER);
572 
573 	de_iir = I915_READ(DEIIR);
574 	gt_iir = I915_READ(GTIIR);
575 	pch_iir = I915_READ(SDEIIR);
576 	pm_iir = I915_READ(GEN6_PMIIR);
577 
578 	if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 &&
579 	    (!IS_GEN6(dev) || pm_iir == 0))
580 		goto done;
581 
582 	if (HAS_PCH_CPT(dev))
583 		hotplug_mask = SDE_HOTPLUG_MASK_CPT;
584 	else
585 		hotplug_mask = SDE_HOTPLUG_MASK;
586 
587 	ret = IRQ_HANDLED;
588 
589 	if (dev->primary->master) {
590 		master_priv = dev->primary->master->driver_priv;
591 		if (master_priv->sarea_priv)
592 			master_priv->sarea_priv->last_dispatch =
593 				READ_BREADCRUMB(dev_priv);
594 	}
595 
596 	if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))
597 		notify_ring(dev, &dev_priv->ring[RCS]);
598 	if (gt_iir & bsd_usr_interrupt)
599 		notify_ring(dev, &dev_priv->ring[VCS]);
600 	if (gt_iir & GT_BLT_USER_INTERRUPT)
601 		notify_ring(dev, &dev_priv->ring[BCS]);
602 
603 	if (de_iir & DE_GSE)
604 		intel_opregion_gse_intr(dev);
605 
606 	if (de_iir & DE_PLANEA_FLIP_DONE) {
607 		intel_prepare_page_flip(dev, 0);
608 		intel_finish_page_flip_plane(dev, 0);
609 	}
610 
611 	if (de_iir & DE_PLANEB_FLIP_DONE) {
612 		intel_prepare_page_flip(dev, 1);
613 		intel_finish_page_flip_plane(dev, 1);
614 	}
615 
616 	if (de_iir & DE_PIPEA_VBLANK)
617 		drm_handle_vblank(dev, 0);
618 
619 	if (de_iir & DE_PIPEB_VBLANK)
620 		drm_handle_vblank(dev, 1);
621 
622 	/* check event from PCH */
623 	if (de_iir & DE_PCH_EVENT) {
624 		if (pch_iir & hotplug_mask)
625 			queue_work(dev_priv->wq, &dev_priv->hotplug_work);
626 		pch_irq_handler(dev);
627 	}
628 
629 	if (de_iir & DE_PCU_EVENT) {
630 		I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
631 		i915_handle_rps_change(dev);
632 	}
633 
634 	if (IS_GEN6(dev) && pm_iir & GEN6_PM_DEFERRED_EVENTS) {
635 		/*
636 		 * IIR bits should never already be set because IMR should
637 		 * prevent an interrupt from being shown in IIR. The warning
638 		 * displays a case where we've unsafely cleared
639 		 * dev_priv->pm_iir. Although missing an interrupt of the same
640 		 * type is not a problem, it displays a problem in the logic.
641 		 *
642 		 * The mask bit in IMR is cleared by rps_work.
643 		 */
644 		unsigned long flags;
645 		spin_lock_irqsave(&dev_priv->rps_lock, flags);
646 		WARN(dev_priv->pm_iir & pm_iir, "Missed a PM interrupt\n");
647 		I915_WRITE(GEN6_PMIMR, pm_iir);
648 		dev_priv->pm_iir |= pm_iir;
649 		spin_unlock_irqrestore(&dev_priv->rps_lock, flags);
650 		queue_work(dev_priv->wq, &dev_priv->rps_work);
651 	}
652 
653 	/* should clear PCH hotplug event before clear CPU irq */
654 	I915_WRITE(SDEIIR, pch_iir);
655 	I915_WRITE(GTIIR, gt_iir);
656 	I915_WRITE(DEIIR, de_iir);
657 	I915_WRITE(GEN6_PMIIR, pm_iir);
658 
659 done:
660 	I915_WRITE(DEIER, de_ier);
661 	POSTING_READ(DEIER);
662 
663 	return ret;
664 }
665 
666 /**
667  * i915_error_work_func - do process context error handling work
668  * @work: work struct
669  *
670  * Fire an error uevent so userspace can see that a hang or error
671  * was detected.
672  */
673 static void i915_error_work_func(struct work_struct *work)
674 {
675 	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
676 						    error_work);
677 	struct drm_device *dev = dev_priv->dev;
678 	char *error_event[] = { "ERROR=1", NULL };
679 	char *reset_event[] = { "RESET=1", NULL };
680 	char *reset_done_event[] = { "ERROR=0", NULL };
681 
682 	kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, error_event);
683 
684 	if (atomic_read(&dev_priv->mm.wedged)) {
685 		DRM_DEBUG_DRIVER("resetting chip\n");
686 		kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_event);
687 		if (!i915_reset(dev, GRDOM_RENDER)) {
688 			atomic_set(&dev_priv->mm.wedged, 0);
689 			kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, reset_done_event);
690 		}
691 		complete_all(&dev_priv->error_completion);
692 	}
693 }
694 
695 #ifdef CONFIG_DEBUG_FS
696 static struct drm_i915_error_object *
697 i915_error_object_create(struct drm_i915_private *dev_priv,
698 			 struct drm_i915_gem_object *src)
699 {
700 	struct drm_i915_error_object *dst;
701 	int page, page_count;
702 	u32 reloc_offset;
703 
704 	if (src == NULL || src->pages == NULL)
705 		return NULL;
706 
707 	page_count = src->base.size / PAGE_SIZE;
708 
709 	dst = kmalloc(sizeof(*dst) + page_count * sizeof (u32 *), GFP_ATOMIC);
710 	if (dst == NULL)
711 		return NULL;
712 
713 	reloc_offset = src->gtt_offset;
714 	for (page = 0; page < page_count; page++) {
715 		unsigned long flags;
716 		void __iomem *s;
717 		void *d;
718 
719 		d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
720 		if (d == NULL)
721 			goto unwind;
722 
723 		local_irq_save(flags);
724 		s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
725 					     reloc_offset);
726 		memcpy_fromio(d, s, PAGE_SIZE);
727 		io_mapping_unmap_atomic(s);
728 		local_irq_restore(flags);
729 
730 		dst->pages[page] = d;
731 
732 		reloc_offset += PAGE_SIZE;
733 	}
734 	dst->page_count = page_count;
735 	dst->gtt_offset = src->gtt_offset;
736 
737 	return dst;
738 
739 unwind:
740 	while (page--)
741 		kfree(dst->pages[page]);
742 	kfree(dst);
743 	return NULL;
744 }
745 
746 static void
747 i915_error_object_free(struct drm_i915_error_object *obj)
748 {
749 	int page;
750 
751 	if (obj == NULL)
752 		return;
753 
754 	for (page = 0; page < obj->page_count; page++)
755 		kfree(obj->pages[page]);
756 
757 	kfree(obj);
758 }
759 
760 static void
761 i915_error_state_free(struct drm_device *dev,
762 		      struct drm_i915_error_state *error)
763 {
764 	int i;
765 
766 	for (i = 0; i < ARRAY_SIZE(error->batchbuffer); i++)
767 		i915_error_object_free(error->batchbuffer[i]);
768 
769 	for (i = 0; i < ARRAY_SIZE(error->ringbuffer); i++)
770 		i915_error_object_free(error->ringbuffer[i]);
771 
772 	kfree(error->active_bo);
773 	kfree(error->overlay);
774 	kfree(error);
775 }
776 
777 static u32 capture_bo_list(struct drm_i915_error_buffer *err,
778 			   int count,
779 			   struct list_head *head)
780 {
781 	struct drm_i915_gem_object *obj;
782 	int i = 0;
783 
784 	list_for_each_entry(obj, head, mm_list) {
785 		err->size = obj->base.size;
786 		err->name = obj->base.name;
787 		err->seqno = obj->last_rendering_seqno;
788 		err->gtt_offset = obj->gtt_offset;
789 		err->read_domains = obj->base.read_domains;
790 		err->write_domain = obj->base.write_domain;
791 		err->fence_reg = obj->fence_reg;
792 		err->pinned = 0;
793 		if (obj->pin_count > 0)
794 			err->pinned = 1;
795 		if (obj->user_pin_count > 0)
796 			err->pinned = -1;
797 		err->tiling = obj->tiling_mode;
798 		err->dirty = obj->dirty;
799 		err->purgeable = obj->madv != I915_MADV_WILLNEED;
800 		err->ring = obj->ring ? obj->ring->id : 0;
801 		err->cache_level = obj->cache_level;
802 
803 		if (++i == count)
804 			break;
805 
806 		err++;
807 	}
808 
809 	return i;
810 }
811 
812 static void i915_gem_record_fences(struct drm_device *dev,
813 				   struct drm_i915_error_state *error)
814 {
815 	struct drm_i915_private *dev_priv = dev->dev_private;
816 	int i;
817 
818 	/* Fences */
819 	switch (INTEL_INFO(dev)->gen) {
820 	case 6:
821 		for (i = 0; i < 16; i++)
822 			error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 + (i * 8));
823 		break;
824 	case 5:
825 	case 4:
826 		for (i = 0; i < 16; i++)
827 			error->fence[i] = I915_READ64(FENCE_REG_965_0 + (i * 8));
828 		break;
829 	case 3:
830 		if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
831 			for (i = 0; i < 8; i++)
832 				error->fence[i+8] = I915_READ(FENCE_REG_945_8 + (i * 4));
833 	case 2:
834 		for (i = 0; i < 8; i++)
835 			error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
836 		break;
837 
838 	}
839 }
840 
841 static struct drm_i915_error_object *
842 i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
843 			     struct intel_ring_buffer *ring)
844 {
845 	struct drm_i915_gem_object *obj;
846 	u32 seqno;
847 
848 	if (!ring->get_seqno)
849 		return NULL;
850 
851 	seqno = ring->get_seqno(ring);
852 	list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
853 		if (obj->ring != ring)
854 			continue;
855 
856 		if (i915_seqno_passed(seqno, obj->last_rendering_seqno))
857 			continue;
858 
859 		if ((obj->base.read_domains & I915_GEM_DOMAIN_COMMAND) == 0)
860 			continue;
861 
862 		/* We need to copy these to an anonymous buffer as the simplest
863 		 * method to avoid being overwritten by userspace.
864 		 */
865 		return i915_error_object_create(dev_priv, obj);
866 	}
867 
868 	return NULL;
869 }
870 
871 /**
872  * i915_capture_error_state - capture an error record for later analysis
873  * @dev: drm device
874  *
875  * Should be called when an error is detected (either a hang or an error
876  * interrupt) to capture error state from the time of the error.  Fills
877  * out a structure which becomes available in debugfs for user level tools
878  * to pick up.
879  */
880 static void i915_capture_error_state(struct drm_device *dev)
881 {
882 	struct drm_i915_private *dev_priv = dev->dev_private;
883 	struct drm_i915_gem_object *obj;
884 	struct drm_i915_error_state *error;
885 	unsigned long flags;
886 	int i, pipe;
887 
888 	spin_lock_irqsave(&dev_priv->error_lock, flags);
889 	error = dev_priv->first_error;
890 	spin_unlock_irqrestore(&dev_priv->error_lock, flags);
891 	if (error)
892 		return;
893 
894 	/* Account for pipe specific data like PIPE*STAT */
895 	error = kmalloc(sizeof(*error), GFP_ATOMIC);
896 	if (!error) {
897 		DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
898 		return;
899 	}
900 
901 	DRM_INFO("capturing error event; look for more information in /debug/dri/%d/i915_error_state\n",
902 		 dev->primary->index);
903 
904 	error->seqno = dev_priv->ring[RCS].get_seqno(&dev_priv->ring[RCS]);
905 	error->eir = I915_READ(EIR);
906 	error->pgtbl_er = I915_READ(PGTBL_ER);
907 	for_each_pipe(pipe)
908 		error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
909 	error->instpm = I915_READ(INSTPM);
910 	error->error = 0;
911 	if (INTEL_INFO(dev)->gen >= 6) {
912 		error->error = I915_READ(ERROR_GEN6);
913 
914 		error->bcs_acthd = I915_READ(BCS_ACTHD);
915 		error->bcs_ipehr = I915_READ(BCS_IPEHR);
916 		error->bcs_ipeir = I915_READ(BCS_IPEIR);
917 		error->bcs_instdone = I915_READ(BCS_INSTDONE);
918 		error->bcs_seqno = 0;
919 		if (dev_priv->ring[BCS].get_seqno)
920 			error->bcs_seqno = dev_priv->ring[BCS].get_seqno(&dev_priv->ring[BCS]);
921 
922 		error->vcs_acthd = I915_READ(VCS_ACTHD);
923 		error->vcs_ipehr = I915_READ(VCS_IPEHR);
924 		error->vcs_ipeir = I915_READ(VCS_IPEIR);
925 		error->vcs_instdone = I915_READ(VCS_INSTDONE);
926 		error->vcs_seqno = 0;
927 		if (dev_priv->ring[VCS].get_seqno)
928 			error->vcs_seqno = dev_priv->ring[VCS].get_seqno(&dev_priv->ring[VCS]);
929 	}
930 	if (INTEL_INFO(dev)->gen >= 4) {
931 		error->ipeir = I915_READ(IPEIR_I965);
932 		error->ipehr = I915_READ(IPEHR_I965);
933 		error->instdone = I915_READ(INSTDONE_I965);
934 		error->instps = I915_READ(INSTPS);
935 		error->instdone1 = I915_READ(INSTDONE1);
936 		error->acthd = I915_READ(ACTHD_I965);
937 		error->bbaddr = I915_READ64(BB_ADDR);
938 	} else {
939 		error->ipeir = I915_READ(IPEIR);
940 		error->ipehr = I915_READ(IPEHR);
941 		error->instdone = I915_READ(INSTDONE);
942 		error->acthd = I915_READ(ACTHD);
943 		error->bbaddr = 0;
944 	}
945 	i915_gem_record_fences(dev, error);
946 
947 	/* Record the active batch and ring buffers */
948 	for (i = 0; i < I915_NUM_RINGS; i++) {
949 		error->batchbuffer[i] =
950 			i915_error_first_batchbuffer(dev_priv,
951 						     &dev_priv->ring[i]);
952 
953 		error->ringbuffer[i] =
954 			i915_error_object_create(dev_priv,
955 						 dev_priv->ring[i].obj);
956 	}
957 
958 	/* Record buffers on the active and pinned lists. */
959 	error->active_bo = NULL;
960 	error->pinned_bo = NULL;
961 
962 	i = 0;
963 	list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list)
964 		i++;
965 	error->active_bo_count = i;
966 	list_for_each_entry(obj, &dev_priv->mm.pinned_list, mm_list)
967 		i++;
968 	error->pinned_bo_count = i - error->active_bo_count;
969 
970 	error->active_bo = NULL;
971 	error->pinned_bo = NULL;
972 	if (i) {
973 		error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
974 					   GFP_ATOMIC);
975 		if (error->active_bo)
976 			error->pinned_bo =
977 				error->active_bo + error->active_bo_count;
978 	}
979 
980 	if (error->active_bo)
981 		error->active_bo_count =
982 			capture_bo_list(error->active_bo,
983 					error->active_bo_count,
984 					&dev_priv->mm.active_list);
985 
986 	if (error->pinned_bo)
987 		error->pinned_bo_count =
988 			capture_bo_list(error->pinned_bo,
989 					error->pinned_bo_count,
990 					&dev_priv->mm.pinned_list);
991 
992 	do_gettimeofday(&error->time);
993 
994 	error->overlay = intel_overlay_capture_error_state(dev);
995 	error->display = intel_display_capture_error_state(dev);
996 
997 	spin_lock_irqsave(&dev_priv->error_lock, flags);
998 	if (dev_priv->first_error == NULL) {
999 		dev_priv->first_error = error;
1000 		error = NULL;
1001 	}
1002 	spin_unlock_irqrestore(&dev_priv->error_lock, flags);
1003 
1004 	if (error)
1005 		i915_error_state_free(dev, error);
1006 }
1007 
1008 void i915_destroy_error_state(struct drm_device *dev)
1009 {
1010 	struct drm_i915_private *dev_priv = dev->dev_private;
1011 	struct drm_i915_error_state *error;
1012 
1013 	spin_lock(&dev_priv->error_lock);
1014 	error = dev_priv->first_error;
1015 	dev_priv->first_error = NULL;
1016 	spin_unlock(&dev_priv->error_lock);
1017 
1018 	if (error)
1019 		i915_error_state_free(dev, error);
1020 }
1021 #else
1022 #define i915_capture_error_state(x)
1023 #endif
1024 
1025 static void i915_report_and_clear_eir(struct drm_device *dev)
1026 {
1027 	struct drm_i915_private *dev_priv = dev->dev_private;
1028 	u32 eir = I915_READ(EIR);
1029 	int pipe;
1030 
1031 	if (!eir)
1032 		return;
1033 
1034 	printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
1035 	       eir);
1036 
1037 	if (IS_G4X(dev)) {
1038 		if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
1039 			u32 ipeir = I915_READ(IPEIR_I965);
1040 
1041 			printk(KERN_ERR "  IPEIR: 0x%08x\n",
1042 			       I915_READ(IPEIR_I965));
1043 			printk(KERN_ERR "  IPEHR: 0x%08x\n",
1044 			       I915_READ(IPEHR_I965));
1045 			printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1046 			       I915_READ(INSTDONE_I965));
1047 			printk(KERN_ERR "  INSTPS: 0x%08x\n",
1048 			       I915_READ(INSTPS));
1049 			printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
1050 			       I915_READ(INSTDONE1));
1051 			printk(KERN_ERR "  ACTHD: 0x%08x\n",
1052 			       I915_READ(ACTHD_I965));
1053 			I915_WRITE(IPEIR_I965, ipeir);
1054 			POSTING_READ(IPEIR_I965);
1055 		}
1056 		if (eir & GM45_ERROR_PAGE_TABLE) {
1057 			u32 pgtbl_err = I915_READ(PGTBL_ER);
1058 			printk(KERN_ERR "page table error\n");
1059 			printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
1060 			       pgtbl_err);
1061 			I915_WRITE(PGTBL_ER, pgtbl_err);
1062 			POSTING_READ(PGTBL_ER);
1063 		}
1064 	}
1065 
1066 	if (!IS_GEN2(dev)) {
1067 		if (eir & I915_ERROR_PAGE_TABLE) {
1068 			u32 pgtbl_err = I915_READ(PGTBL_ER);
1069 			printk(KERN_ERR "page table error\n");
1070 			printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
1071 			       pgtbl_err);
1072 			I915_WRITE(PGTBL_ER, pgtbl_err);
1073 			POSTING_READ(PGTBL_ER);
1074 		}
1075 	}
1076 
1077 	if (eir & I915_ERROR_MEMORY_REFRESH) {
1078 		printk(KERN_ERR "memory refresh error:\n");
1079 		for_each_pipe(pipe)
1080 			printk(KERN_ERR "pipe %c stat: 0x%08x\n",
1081 			       pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
1082 		/* pipestat has already been acked */
1083 	}
1084 	if (eir & I915_ERROR_INSTRUCTION) {
1085 		printk(KERN_ERR "instruction error\n");
1086 		printk(KERN_ERR "  INSTPM: 0x%08x\n",
1087 		       I915_READ(INSTPM));
1088 		if (INTEL_INFO(dev)->gen < 4) {
1089 			u32 ipeir = I915_READ(IPEIR);
1090 
1091 			printk(KERN_ERR "  IPEIR: 0x%08x\n",
1092 			       I915_READ(IPEIR));
1093 			printk(KERN_ERR "  IPEHR: 0x%08x\n",
1094 			       I915_READ(IPEHR));
1095 			printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1096 			       I915_READ(INSTDONE));
1097 			printk(KERN_ERR "  ACTHD: 0x%08x\n",
1098 			       I915_READ(ACTHD));
1099 			I915_WRITE(IPEIR, ipeir);
1100 			POSTING_READ(IPEIR);
1101 		} else {
1102 			u32 ipeir = I915_READ(IPEIR_I965);
1103 
1104 			printk(KERN_ERR "  IPEIR: 0x%08x\n",
1105 			       I915_READ(IPEIR_I965));
1106 			printk(KERN_ERR "  IPEHR: 0x%08x\n",
1107 			       I915_READ(IPEHR_I965));
1108 			printk(KERN_ERR "  INSTDONE: 0x%08x\n",
1109 			       I915_READ(INSTDONE_I965));
1110 			printk(KERN_ERR "  INSTPS: 0x%08x\n",
1111 			       I915_READ(INSTPS));
1112 			printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
1113 			       I915_READ(INSTDONE1));
1114 			printk(KERN_ERR "  ACTHD: 0x%08x\n",
1115 			       I915_READ(ACTHD_I965));
1116 			I915_WRITE(IPEIR_I965, ipeir);
1117 			POSTING_READ(IPEIR_I965);
1118 		}
1119 	}
1120 
1121 	I915_WRITE(EIR, eir);
1122 	POSTING_READ(EIR);
1123 	eir = I915_READ(EIR);
1124 	if (eir) {
1125 		/*
1126 		 * some errors might have become stuck,
1127 		 * mask them.
1128 		 */
1129 		DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
1130 		I915_WRITE(EMR, I915_READ(EMR) | eir);
1131 		I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
1132 	}
1133 }
1134 
1135 /**
1136  * i915_handle_error - handle an error interrupt
1137  * @dev: drm device
1138  *
1139  * Do some basic checking of regsiter state at error interrupt time and
1140  * dump it to the syslog.  Also call i915_capture_error_state() to make
1141  * sure we get a record and make it available in debugfs.  Fire a uevent
1142  * so userspace knows something bad happened (should trigger collection
1143  * of a ring dump etc.).
1144  */
1145 void i915_handle_error(struct drm_device *dev, bool wedged)
1146 {
1147 	struct drm_i915_private *dev_priv = dev->dev_private;
1148 
1149 	i915_capture_error_state(dev);
1150 	i915_report_and_clear_eir(dev);
1151 
1152 	if (wedged) {
1153 		INIT_COMPLETION(dev_priv->error_completion);
1154 		atomic_set(&dev_priv->mm.wedged, 1);
1155 
1156 		/*
1157 		 * Wakeup waiting processes so they don't hang
1158 		 */
1159 		wake_up_all(&dev_priv->ring[RCS].irq_queue);
1160 		if (HAS_BSD(dev))
1161 			wake_up_all(&dev_priv->ring[VCS].irq_queue);
1162 		if (HAS_BLT(dev))
1163 			wake_up_all(&dev_priv->ring[BCS].irq_queue);
1164 	}
1165 
1166 	queue_work(dev_priv->wq, &dev_priv->error_work);
1167 }
1168 
1169 static void i915_pageflip_stall_check(struct drm_device *dev, int pipe)
1170 {
1171 	drm_i915_private_t *dev_priv = dev->dev_private;
1172 	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
1173 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
1174 	struct drm_i915_gem_object *obj;
1175 	struct intel_unpin_work *work;
1176 	unsigned long flags;
1177 	bool stall_detected;
1178 
1179 	/* Ignore early vblank irqs */
1180 	if (intel_crtc == NULL)
1181 		return;
1182 
1183 	spin_lock_irqsave(&dev->event_lock, flags);
1184 	work = intel_crtc->unpin_work;
1185 
1186 	if (work == NULL || work->pending || !work->enable_stall_check) {
1187 		/* Either the pending flip IRQ arrived, or we're too early. Don't check */
1188 		spin_unlock_irqrestore(&dev->event_lock, flags);
1189 		return;
1190 	}
1191 
1192 	/* Potential stall - if we see that the flip has happened, assume a missed interrupt */
1193 	obj = work->pending_flip_obj;
1194 	if (INTEL_INFO(dev)->gen >= 4) {
1195 		int dspsurf = DSPSURF(intel_crtc->plane);
1196 		stall_detected = I915_READ(dspsurf) == obj->gtt_offset;
1197 	} else {
1198 		int dspaddr = DSPADDR(intel_crtc->plane);
1199 		stall_detected = I915_READ(dspaddr) == (obj->gtt_offset +
1200 							crtc->y * crtc->fb->pitch +
1201 							crtc->x * crtc->fb->bits_per_pixel/8);
1202 	}
1203 
1204 	spin_unlock_irqrestore(&dev->event_lock, flags);
1205 
1206 	if (stall_detected) {
1207 		DRM_DEBUG_DRIVER("Pageflip stall detected\n");
1208 		intel_prepare_page_flip(dev, intel_crtc->plane);
1209 	}
1210 }
1211 
1212 static irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
1213 {
1214 	struct drm_device *dev = (struct drm_device *) arg;
1215 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1216 	struct drm_i915_master_private *master_priv;
1217 	u32 iir, new_iir;
1218 	u32 pipe_stats[I915_MAX_PIPES];
1219 	u32 vblank_status;
1220 	int vblank = 0;
1221 	unsigned long irqflags;
1222 	int irq_received;
1223 	int ret = IRQ_NONE, pipe;
1224 	bool blc_event = false;
1225 
1226 	atomic_inc(&dev_priv->irq_received);
1227 
1228 	iir = I915_READ(IIR);
1229 
1230 	if (INTEL_INFO(dev)->gen >= 4)
1231 		vblank_status = PIPE_START_VBLANK_INTERRUPT_STATUS;
1232 	else
1233 		vblank_status = PIPE_VBLANK_INTERRUPT_STATUS;
1234 
1235 	for (;;) {
1236 		irq_received = iir != 0;
1237 
1238 		/* Can't rely on pipestat interrupt bit in iir as it might
1239 		 * have been cleared after the pipestat interrupt was received.
1240 		 * It doesn't set the bit in iir again, but it still produces
1241 		 * interrupts (for non-MSI).
1242 		 */
1243 		spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1244 		if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
1245 			i915_handle_error(dev, false);
1246 
1247 		for_each_pipe(pipe) {
1248 			int reg = PIPESTAT(pipe);
1249 			pipe_stats[pipe] = I915_READ(reg);
1250 
1251 			/*
1252 			 * Clear the PIPE*STAT regs before the IIR
1253 			 */
1254 			if (pipe_stats[pipe] & 0x8000ffff) {
1255 				if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
1256 					DRM_DEBUG_DRIVER("pipe %c underrun\n",
1257 							 pipe_name(pipe));
1258 				I915_WRITE(reg, pipe_stats[pipe]);
1259 				irq_received = 1;
1260 			}
1261 		}
1262 		spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1263 
1264 		if (!irq_received)
1265 			break;
1266 
1267 		ret = IRQ_HANDLED;
1268 
1269 		/* Consume port.  Then clear IIR or we'll miss events */
1270 		if ((I915_HAS_HOTPLUG(dev)) &&
1271 		    (iir & I915_DISPLAY_PORT_INTERRUPT)) {
1272 			u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
1273 
1274 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
1275 				  hotplug_status);
1276 			if (hotplug_status & dev_priv->hotplug_supported_mask)
1277 				queue_work(dev_priv->wq,
1278 					   &dev_priv->hotplug_work);
1279 
1280 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
1281 			I915_READ(PORT_HOTPLUG_STAT);
1282 		}
1283 
1284 		I915_WRITE(IIR, iir);
1285 		new_iir = I915_READ(IIR); /* Flush posted writes */
1286 
1287 		if (dev->primary->master) {
1288 			master_priv = dev->primary->master->driver_priv;
1289 			if (master_priv->sarea_priv)
1290 				master_priv->sarea_priv->last_dispatch =
1291 					READ_BREADCRUMB(dev_priv);
1292 		}
1293 
1294 		if (iir & I915_USER_INTERRUPT)
1295 			notify_ring(dev, &dev_priv->ring[RCS]);
1296 		if (iir & I915_BSD_USER_INTERRUPT)
1297 			notify_ring(dev, &dev_priv->ring[VCS]);
1298 
1299 		if (iir & I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT) {
1300 			intel_prepare_page_flip(dev, 0);
1301 			if (dev_priv->flip_pending_is_done)
1302 				intel_finish_page_flip_plane(dev, 0);
1303 		}
1304 
1305 		if (iir & I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT) {
1306 			intel_prepare_page_flip(dev, 1);
1307 			if (dev_priv->flip_pending_is_done)
1308 				intel_finish_page_flip_plane(dev, 1);
1309 		}
1310 
1311 		for_each_pipe(pipe) {
1312 			if (pipe_stats[pipe] & vblank_status &&
1313 			    drm_handle_vblank(dev, pipe)) {
1314 				vblank++;
1315 				if (!dev_priv->flip_pending_is_done) {
1316 					i915_pageflip_stall_check(dev, pipe);
1317 					intel_finish_page_flip(dev, pipe);
1318 				}
1319 			}
1320 
1321 			if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
1322 				blc_event = true;
1323 		}
1324 
1325 
1326 		if (blc_event || (iir & I915_ASLE_INTERRUPT))
1327 			intel_opregion_asle_intr(dev);
1328 
1329 		/* With MSI, interrupts are only generated when iir
1330 		 * transitions from zero to nonzero.  If another bit got
1331 		 * set while we were handling the existing iir bits, then
1332 		 * we would never get another interrupt.
1333 		 *
1334 		 * This is fine on non-MSI as well, as if we hit this path
1335 		 * we avoid exiting the interrupt handler only to generate
1336 		 * another one.
1337 		 *
1338 		 * Note that for MSI this could cause a stray interrupt report
1339 		 * if an interrupt landed in the time between writing IIR and
1340 		 * the posting read.  This should be rare enough to never
1341 		 * trigger the 99% of 100,000 interrupts test for disabling
1342 		 * stray interrupts.
1343 		 */
1344 		iir = new_iir;
1345 	}
1346 
1347 	return ret;
1348 }
1349 
1350 static int i915_emit_irq(struct drm_device * dev)
1351 {
1352 	drm_i915_private_t *dev_priv = dev->dev_private;
1353 	struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
1354 
1355 	i915_kernel_lost_context(dev);
1356 
1357 	DRM_DEBUG_DRIVER("\n");
1358 
1359 	dev_priv->counter++;
1360 	if (dev_priv->counter > 0x7FFFFFFFUL)
1361 		dev_priv->counter = 1;
1362 	if (master_priv->sarea_priv)
1363 		master_priv->sarea_priv->last_enqueue = dev_priv->counter;
1364 
1365 	if (BEGIN_LP_RING(4) == 0) {
1366 		OUT_RING(MI_STORE_DWORD_INDEX);
1367 		OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
1368 		OUT_RING(dev_priv->counter);
1369 		OUT_RING(MI_USER_INTERRUPT);
1370 		ADVANCE_LP_RING();
1371 	}
1372 
1373 	return dev_priv->counter;
1374 }
1375 
1376 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
1377 {
1378 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1379 	struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
1380 	int ret = 0;
1381 	struct intel_ring_buffer *ring = LP_RING(dev_priv);
1382 
1383 	DRM_DEBUG_DRIVER("irq_nr=%d breadcrumb=%d\n", irq_nr,
1384 		  READ_BREADCRUMB(dev_priv));
1385 
1386 	if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
1387 		if (master_priv->sarea_priv)
1388 			master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
1389 		return 0;
1390 	}
1391 
1392 	if (master_priv->sarea_priv)
1393 		master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
1394 
1395 	if (ring->irq_get(ring)) {
1396 		DRM_WAIT_ON(ret, ring->irq_queue, 3 * DRM_HZ,
1397 			    READ_BREADCRUMB(dev_priv) >= irq_nr);
1398 		ring->irq_put(ring);
1399 	} else if (wait_for(READ_BREADCRUMB(dev_priv) >= irq_nr, 3000))
1400 		ret = -EBUSY;
1401 
1402 	if (ret == -EBUSY) {
1403 		DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
1404 			  READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
1405 	}
1406 
1407 	return ret;
1408 }
1409 
1410 /* Needs the lock as it touches the ring.
1411  */
1412 int i915_irq_emit(struct drm_device *dev, void *data,
1413 			 struct drm_file *file_priv)
1414 {
1415 	drm_i915_private_t *dev_priv = dev->dev_private;
1416 	drm_i915_irq_emit_t *emit = data;
1417 	int result;
1418 
1419 	if (!dev_priv || !LP_RING(dev_priv)->virtual_start) {
1420 		DRM_ERROR("called with no initialization\n");
1421 		return -EINVAL;
1422 	}
1423 
1424 	RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
1425 
1426 	mutex_lock(&dev->struct_mutex);
1427 	result = i915_emit_irq(dev);
1428 	mutex_unlock(&dev->struct_mutex);
1429 
1430 	if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
1431 		DRM_ERROR("copy_to_user\n");
1432 		return -EFAULT;
1433 	}
1434 
1435 	return 0;
1436 }
1437 
1438 /* Doesn't need the hardware lock.
1439  */
1440 int i915_irq_wait(struct drm_device *dev, void *data,
1441 			 struct drm_file *file_priv)
1442 {
1443 	drm_i915_private_t *dev_priv = dev->dev_private;
1444 	drm_i915_irq_wait_t *irqwait = data;
1445 
1446 	if (!dev_priv) {
1447 		DRM_ERROR("called with no initialization\n");
1448 		return -EINVAL;
1449 	}
1450 
1451 	return i915_wait_irq(dev, irqwait->irq_seq);
1452 }
1453 
1454 /* Called from drm generic code, passed 'crtc' which
1455  * we use as a pipe index
1456  */
1457 static int i915_enable_vblank(struct drm_device *dev, int pipe)
1458 {
1459 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1460 	unsigned long irqflags;
1461 
1462 	if (!i915_pipe_enabled(dev, pipe))
1463 		return -EINVAL;
1464 
1465 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1466 	if (INTEL_INFO(dev)->gen >= 4)
1467 		i915_enable_pipestat(dev_priv, pipe,
1468 				     PIPE_START_VBLANK_INTERRUPT_ENABLE);
1469 	else
1470 		i915_enable_pipestat(dev_priv, pipe,
1471 				     PIPE_VBLANK_INTERRUPT_ENABLE);
1472 
1473 	/* maintain vblank delivery even in deep C-states */
1474 	if (dev_priv->info->gen == 3)
1475 		I915_WRITE(INSTPM, INSTPM_AGPBUSY_DIS << 16);
1476 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1477 
1478 	return 0;
1479 }
1480 
1481 static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
1482 {
1483 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1484 	unsigned long irqflags;
1485 
1486 	if (!i915_pipe_enabled(dev, pipe))
1487 		return -EINVAL;
1488 
1489 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1490 	ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
1491 				    DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
1492 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1493 
1494 	return 0;
1495 }
1496 
1497 static int ivybridge_enable_vblank(struct drm_device *dev, int pipe)
1498 {
1499 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1500 	unsigned long irqflags;
1501 
1502 	if (!i915_pipe_enabled(dev, pipe))
1503 		return -EINVAL;
1504 
1505 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1506 	ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
1507 				    DE_PIPEA_VBLANK_IVB : DE_PIPEB_VBLANK_IVB);
1508 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1509 
1510 	return 0;
1511 }
1512 
1513 /* Called from drm generic code, passed 'crtc' which
1514  * we use as a pipe index
1515  */
1516 static void i915_disable_vblank(struct drm_device *dev, int pipe)
1517 {
1518 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1519 	unsigned long irqflags;
1520 
1521 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1522 	if (dev_priv->info->gen == 3)
1523 		I915_WRITE(INSTPM,
1524 			   INSTPM_AGPBUSY_DIS << 16 | INSTPM_AGPBUSY_DIS);
1525 
1526 	i915_disable_pipestat(dev_priv, pipe,
1527 			      PIPE_VBLANK_INTERRUPT_ENABLE |
1528 			      PIPE_START_VBLANK_INTERRUPT_ENABLE);
1529 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1530 }
1531 
1532 static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
1533 {
1534 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1535 	unsigned long irqflags;
1536 
1537 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1538 	ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
1539 				     DE_PIPEA_VBLANK: DE_PIPEB_VBLANK);
1540 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1541 }
1542 
1543 static void ivybridge_disable_vblank(struct drm_device *dev, int pipe)
1544 {
1545 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1546 	unsigned long irqflags;
1547 
1548 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1549 	ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
1550 				     DE_PIPEA_VBLANK_IVB : DE_PIPEB_VBLANK_IVB);
1551 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1552 }
1553 
1554 /* Set the vblank monitor pipe
1555  */
1556 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
1557 			 struct drm_file *file_priv)
1558 {
1559 	drm_i915_private_t *dev_priv = dev->dev_private;
1560 
1561 	if (!dev_priv) {
1562 		DRM_ERROR("called with no initialization\n");
1563 		return -EINVAL;
1564 	}
1565 
1566 	return 0;
1567 }
1568 
1569 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
1570 			 struct drm_file *file_priv)
1571 {
1572 	drm_i915_private_t *dev_priv = dev->dev_private;
1573 	drm_i915_vblank_pipe_t *pipe = data;
1574 
1575 	if (!dev_priv) {
1576 		DRM_ERROR("called with no initialization\n");
1577 		return -EINVAL;
1578 	}
1579 
1580 	pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1581 
1582 	return 0;
1583 }
1584 
1585 /**
1586  * Schedule buffer swap at given vertical blank.
1587  */
1588 int i915_vblank_swap(struct drm_device *dev, void *data,
1589 		     struct drm_file *file_priv)
1590 {
1591 	/* The delayed swap mechanism was fundamentally racy, and has been
1592 	 * removed.  The model was that the client requested a delayed flip/swap
1593 	 * from the kernel, then waited for vblank before continuing to perform
1594 	 * rendering.  The problem was that the kernel might wake the client
1595 	 * up before it dispatched the vblank swap (since the lock has to be
1596 	 * held while touching the ringbuffer), in which case the client would
1597 	 * clear and start the next frame before the swap occurred, and
1598 	 * flicker would occur in addition to likely missing the vblank.
1599 	 *
1600 	 * In the absence of this ioctl, userland falls back to a correct path
1601 	 * of waiting for a vblank, then dispatching the swap on its own.
1602 	 * Context switching to userland and back is plenty fast enough for
1603 	 * meeting the requirements of vblank swapping.
1604 	 */
1605 	return -EINVAL;
1606 }
1607 
1608 static u32
1609 ring_last_seqno(struct intel_ring_buffer *ring)
1610 {
1611 	return list_entry(ring->request_list.prev,
1612 			  struct drm_i915_gem_request, list)->seqno;
1613 }
1614 
1615 static bool i915_hangcheck_ring_idle(struct intel_ring_buffer *ring, bool *err)
1616 {
1617 	if (list_empty(&ring->request_list) ||
1618 	    i915_seqno_passed(ring->get_seqno(ring), ring_last_seqno(ring))) {
1619 		/* Issue a wake-up to catch stuck h/w. */
1620 		if (ring->waiting_seqno && waitqueue_active(&ring->irq_queue)) {
1621 			DRM_ERROR("Hangcheck timer elapsed... %s idle [waiting on %d, at %d], missed IRQ?\n",
1622 				  ring->name,
1623 				  ring->waiting_seqno,
1624 				  ring->get_seqno(ring));
1625 			wake_up_all(&ring->irq_queue);
1626 			*err = true;
1627 		}
1628 		return true;
1629 	}
1630 	return false;
1631 }
1632 
1633 static bool kick_ring(struct intel_ring_buffer *ring)
1634 {
1635 	struct drm_device *dev = ring->dev;
1636 	struct drm_i915_private *dev_priv = dev->dev_private;
1637 	u32 tmp = I915_READ_CTL(ring);
1638 	if (tmp & RING_WAIT) {
1639 		DRM_ERROR("Kicking stuck wait on %s\n",
1640 			  ring->name);
1641 		I915_WRITE_CTL(ring, tmp);
1642 		return true;
1643 	}
1644 	if (IS_GEN6(dev) &&
1645 	    (tmp & RING_WAIT_SEMAPHORE)) {
1646 		DRM_ERROR("Kicking stuck semaphore on %s\n",
1647 			  ring->name);
1648 		I915_WRITE_CTL(ring, tmp);
1649 		return true;
1650 	}
1651 	return false;
1652 }
1653 
1654 /**
1655  * This is called when the chip hasn't reported back with completed
1656  * batchbuffers in a long time. The first time this is called we simply record
1657  * ACTHD. If ACTHD hasn't changed by the time the hangcheck timer elapses
1658  * again, we assume the chip is wedged and try to fix it.
1659  */
1660 void i915_hangcheck_elapsed(unsigned long data)
1661 {
1662 	struct drm_device *dev = (struct drm_device *)data;
1663 	drm_i915_private_t *dev_priv = dev->dev_private;
1664 	uint32_t acthd, instdone, instdone1;
1665 	bool err = false;
1666 
1667 	/* If all work is done then ACTHD clearly hasn't advanced. */
1668 	if (i915_hangcheck_ring_idle(&dev_priv->ring[RCS], &err) &&
1669 	    i915_hangcheck_ring_idle(&dev_priv->ring[VCS], &err) &&
1670 	    i915_hangcheck_ring_idle(&dev_priv->ring[BCS], &err)) {
1671 		dev_priv->hangcheck_count = 0;
1672 		if (err)
1673 			goto repeat;
1674 		return;
1675 	}
1676 
1677 	if (INTEL_INFO(dev)->gen < 4) {
1678 		acthd = I915_READ(ACTHD);
1679 		instdone = I915_READ(INSTDONE);
1680 		instdone1 = 0;
1681 	} else {
1682 		acthd = I915_READ(ACTHD_I965);
1683 		instdone = I915_READ(INSTDONE_I965);
1684 		instdone1 = I915_READ(INSTDONE1);
1685 	}
1686 
1687 	if (dev_priv->last_acthd == acthd &&
1688 	    dev_priv->last_instdone == instdone &&
1689 	    dev_priv->last_instdone1 == instdone1) {
1690 		if (dev_priv->hangcheck_count++ > 1) {
1691 			DRM_ERROR("Hangcheck timer elapsed... GPU hung\n");
1692 
1693 			if (!IS_GEN2(dev)) {
1694 				/* Is the chip hanging on a WAIT_FOR_EVENT?
1695 				 * If so we can simply poke the RB_WAIT bit
1696 				 * and break the hang. This should work on
1697 				 * all but the second generation chipsets.
1698 				 */
1699 
1700 				if (kick_ring(&dev_priv->ring[RCS]))
1701 					goto repeat;
1702 
1703 				if (HAS_BSD(dev) &&
1704 				    kick_ring(&dev_priv->ring[VCS]))
1705 					goto repeat;
1706 
1707 				if (HAS_BLT(dev) &&
1708 				    kick_ring(&dev_priv->ring[BCS]))
1709 					goto repeat;
1710 			}
1711 
1712 			i915_handle_error(dev, true);
1713 			return;
1714 		}
1715 	} else {
1716 		dev_priv->hangcheck_count = 0;
1717 
1718 		dev_priv->last_acthd = acthd;
1719 		dev_priv->last_instdone = instdone;
1720 		dev_priv->last_instdone1 = instdone1;
1721 	}
1722 
1723 repeat:
1724 	/* Reset timer case chip hangs without another request being added */
1725 	mod_timer(&dev_priv->hangcheck_timer,
1726 		  jiffies + msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD));
1727 }
1728 
1729 /* drm_dma.h hooks
1730 */
1731 static void ironlake_irq_preinstall(struct drm_device *dev)
1732 {
1733 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1734 
1735 	atomic_set(&dev_priv->irq_received, 0);
1736 
1737 	INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
1738 	INIT_WORK(&dev_priv->error_work, i915_error_work_func);
1739 	if (IS_GEN6(dev) || IS_IVYBRIDGE(dev))
1740 		INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
1741 
1742 	I915_WRITE(HWSTAM, 0xeffe);
1743 	if (IS_GEN6(dev) || IS_GEN7(dev)) {
1744 		/* Workaround stalls observed on Sandy Bridge GPUs by
1745 		 * making the blitter command streamer generate a
1746 		 * write to the Hardware Status Page for
1747 		 * MI_USER_INTERRUPT.  This appears to serialize the
1748 		 * previous seqno write out before the interrupt
1749 		 * happens.
1750 		 */
1751 		I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
1752 		I915_WRITE(GEN6_BSD_HWSTAM, ~GEN6_BSD_USER_INTERRUPT);
1753 	}
1754 
1755 	/* XXX hotplug from PCH */
1756 
1757 	I915_WRITE(DEIMR, 0xffffffff);
1758 	I915_WRITE(DEIER, 0x0);
1759 	POSTING_READ(DEIER);
1760 
1761 	/* and GT */
1762 	I915_WRITE(GTIMR, 0xffffffff);
1763 	I915_WRITE(GTIER, 0x0);
1764 	POSTING_READ(GTIER);
1765 
1766 	/* south display irq */
1767 	I915_WRITE(SDEIMR, 0xffffffff);
1768 	I915_WRITE(SDEIER, 0x0);
1769 	POSTING_READ(SDEIER);
1770 }
1771 
1772 static int ironlake_irq_postinstall(struct drm_device *dev)
1773 {
1774 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1775 	/* enable kind of interrupts always enabled */
1776 	u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
1777 			   DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE;
1778 	u32 render_irqs;
1779 	u32 hotplug_mask;
1780 
1781 	DRM_INIT_WAITQUEUE(&dev_priv->ring[RCS].irq_queue);
1782 	if (HAS_BSD(dev))
1783 		DRM_INIT_WAITQUEUE(&dev_priv->ring[VCS].irq_queue);
1784 	if (HAS_BLT(dev))
1785 		DRM_INIT_WAITQUEUE(&dev_priv->ring[BCS].irq_queue);
1786 
1787 	dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1788 	dev_priv->irq_mask = ~display_mask;
1789 
1790 	/* should always can generate irq */
1791 	I915_WRITE(DEIIR, I915_READ(DEIIR));
1792 	I915_WRITE(DEIMR, dev_priv->irq_mask);
1793 	I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK | DE_PIPEB_VBLANK);
1794 	POSTING_READ(DEIER);
1795 
1796 	dev_priv->gt_irq_mask = ~0;
1797 
1798 	I915_WRITE(GTIIR, I915_READ(GTIIR));
1799 	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
1800 
1801 	if (IS_GEN6(dev))
1802 		render_irqs =
1803 			GT_USER_INTERRUPT |
1804 			GT_GEN6_BSD_USER_INTERRUPT |
1805 			GT_BLT_USER_INTERRUPT;
1806 	else
1807 		render_irqs =
1808 			GT_USER_INTERRUPT |
1809 			GT_PIPE_NOTIFY |
1810 			GT_BSD_USER_INTERRUPT;
1811 	I915_WRITE(GTIER, render_irqs);
1812 	POSTING_READ(GTIER);
1813 
1814 	if (HAS_PCH_CPT(dev)) {
1815 		hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
1816 				SDE_PORTB_HOTPLUG_CPT |
1817 				SDE_PORTC_HOTPLUG_CPT |
1818 				SDE_PORTD_HOTPLUG_CPT);
1819 	} else {
1820 		hotplug_mask = (SDE_CRT_HOTPLUG |
1821 				SDE_PORTB_HOTPLUG |
1822 				SDE_PORTC_HOTPLUG |
1823 				SDE_PORTD_HOTPLUG |
1824 				SDE_AUX_MASK);
1825 	}
1826 
1827 	dev_priv->pch_irq_mask = ~hotplug_mask;
1828 
1829 	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
1830 	I915_WRITE(SDEIMR, dev_priv->pch_irq_mask);
1831 	I915_WRITE(SDEIER, hotplug_mask);
1832 	POSTING_READ(SDEIER);
1833 
1834 	if (IS_IRONLAKE_M(dev)) {
1835 		/* Clear & enable PCU event interrupts */
1836 		I915_WRITE(DEIIR, DE_PCU_EVENT);
1837 		I915_WRITE(DEIER, I915_READ(DEIER) | DE_PCU_EVENT);
1838 		ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);
1839 	}
1840 
1841 	return 0;
1842 }
1843 
1844 static int ivybridge_irq_postinstall(struct drm_device *dev)
1845 {
1846 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1847 	/* enable kind of interrupts always enabled */
1848 	u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE_IVB |
1849 		DE_PCH_EVENT_IVB | DE_PLANEA_FLIP_DONE_IVB |
1850 		DE_PLANEB_FLIP_DONE_IVB;
1851 	u32 render_irqs;
1852 	u32 hotplug_mask;
1853 
1854 	DRM_INIT_WAITQUEUE(&dev_priv->ring[RCS].irq_queue);
1855 	if (HAS_BSD(dev))
1856 		DRM_INIT_WAITQUEUE(&dev_priv->ring[VCS].irq_queue);
1857 	if (HAS_BLT(dev))
1858 		DRM_INIT_WAITQUEUE(&dev_priv->ring[BCS].irq_queue);
1859 
1860 	dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1861 	dev_priv->irq_mask = ~display_mask;
1862 
1863 	/* should always can generate irq */
1864 	I915_WRITE(DEIIR, I915_READ(DEIIR));
1865 	I915_WRITE(DEIMR, dev_priv->irq_mask);
1866 	I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK_IVB |
1867 		   DE_PIPEB_VBLANK_IVB);
1868 	POSTING_READ(DEIER);
1869 
1870 	dev_priv->gt_irq_mask = ~0;
1871 
1872 	I915_WRITE(GTIIR, I915_READ(GTIIR));
1873 	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
1874 
1875 	render_irqs = GT_USER_INTERRUPT | GT_GEN6_BSD_USER_INTERRUPT |
1876 		GT_BLT_USER_INTERRUPT;
1877 	I915_WRITE(GTIER, render_irqs);
1878 	POSTING_READ(GTIER);
1879 
1880 	hotplug_mask = (SDE_CRT_HOTPLUG_CPT |
1881 			SDE_PORTB_HOTPLUG_CPT |
1882 			SDE_PORTC_HOTPLUG_CPT |
1883 			SDE_PORTD_HOTPLUG_CPT);
1884 	dev_priv->pch_irq_mask = ~hotplug_mask;
1885 
1886 	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
1887 	I915_WRITE(SDEIMR, dev_priv->pch_irq_mask);
1888 	I915_WRITE(SDEIER, hotplug_mask);
1889 	POSTING_READ(SDEIER);
1890 
1891 	return 0;
1892 }
1893 
1894 static void i915_driver_irq_preinstall(struct drm_device * dev)
1895 {
1896 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1897 	int pipe;
1898 
1899 	atomic_set(&dev_priv->irq_received, 0);
1900 
1901 	INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
1902 	INIT_WORK(&dev_priv->error_work, i915_error_work_func);
1903 
1904 	if (I915_HAS_HOTPLUG(dev)) {
1905 		I915_WRITE(PORT_HOTPLUG_EN, 0);
1906 		I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1907 	}
1908 
1909 	I915_WRITE(HWSTAM, 0xeffe);
1910 	for_each_pipe(pipe)
1911 		I915_WRITE(PIPESTAT(pipe), 0);
1912 	I915_WRITE(IMR, 0xffffffff);
1913 	I915_WRITE(IER, 0x0);
1914 	POSTING_READ(IER);
1915 }
1916 
1917 /*
1918  * Must be called after intel_modeset_init or hotplug interrupts won't be
1919  * enabled correctly.
1920  */
1921 static int i915_driver_irq_postinstall(struct drm_device *dev)
1922 {
1923 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1924 	u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
1925 	u32 error_mask;
1926 
1927 	dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
1928 
1929 	/* Unmask the interrupts that we always want on. */
1930 	dev_priv->irq_mask = ~I915_INTERRUPT_ENABLE_FIX;
1931 
1932 	dev_priv->pipestat[0] = 0;
1933 	dev_priv->pipestat[1] = 0;
1934 
1935 	if (I915_HAS_HOTPLUG(dev)) {
1936 		/* Enable in IER... */
1937 		enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
1938 		/* and unmask in IMR */
1939 		dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
1940 	}
1941 
1942 	/*
1943 	 * Enable some error detection, note the instruction error mask
1944 	 * bit is reserved, so we leave it masked.
1945 	 */
1946 	if (IS_G4X(dev)) {
1947 		error_mask = ~(GM45_ERROR_PAGE_TABLE |
1948 			       GM45_ERROR_MEM_PRIV |
1949 			       GM45_ERROR_CP_PRIV |
1950 			       I915_ERROR_MEMORY_REFRESH);
1951 	} else {
1952 		error_mask = ~(I915_ERROR_PAGE_TABLE |
1953 			       I915_ERROR_MEMORY_REFRESH);
1954 	}
1955 	I915_WRITE(EMR, error_mask);
1956 
1957 	I915_WRITE(IMR, dev_priv->irq_mask);
1958 	I915_WRITE(IER, enable_mask);
1959 	POSTING_READ(IER);
1960 
1961 	if (I915_HAS_HOTPLUG(dev)) {
1962 		u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
1963 
1964 		/* Note HDMI and DP share bits */
1965 		if (dev_priv->hotplug_supported_mask & HDMIB_HOTPLUG_INT_STATUS)
1966 			hotplug_en |= HDMIB_HOTPLUG_INT_EN;
1967 		if (dev_priv->hotplug_supported_mask & HDMIC_HOTPLUG_INT_STATUS)
1968 			hotplug_en |= HDMIC_HOTPLUG_INT_EN;
1969 		if (dev_priv->hotplug_supported_mask & HDMID_HOTPLUG_INT_STATUS)
1970 			hotplug_en |= HDMID_HOTPLUG_INT_EN;
1971 		if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS)
1972 			hotplug_en |= SDVOC_HOTPLUG_INT_EN;
1973 		if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS)
1974 			hotplug_en |= SDVOB_HOTPLUG_INT_EN;
1975 		if (dev_priv->hotplug_supported_mask & CRT_HOTPLUG_INT_STATUS) {
1976 			hotplug_en |= CRT_HOTPLUG_INT_EN;
1977 
1978 			/* Programming the CRT detection parameters tends
1979 			   to generate a spurious hotplug event about three
1980 			   seconds later.  So just do it once.
1981 			*/
1982 			if (IS_G4X(dev))
1983 				hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
1984 			hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
1985 		}
1986 
1987 		/* Ignore TV since it's buggy */
1988 
1989 		I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
1990 	}
1991 
1992 	intel_opregion_enable_asle(dev);
1993 
1994 	return 0;
1995 }
1996 
1997 static void ironlake_irq_uninstall(struct drm_device *dev)
1998 {
1999 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2000 
2001 	if (!dev_priv)
2002 		return;
2003 
2004 	dev_priv->vblank_pipe = 0;
2005 
2006 	I915_WRITE(HWSTAM, 0xffffffff);
2007 
2008 	I915_WRITE(DEIMR, 0xffffffff);
2009 	I915_WRITE(DEIER, 0x0);
2010 	I915_WRITE(DEIIR, I915_READ(DEIIR));
2011 
2012 	I915_WRITE(GTIMR, 0xffffffff);
2013 	I915_WRITE(GTIER, 0x0);
2014 	I915_WRITE(GTIIR, I915_READ(GTIIR));
2015 }
2016 
2017 static void i915_driver_irq_uninstall(struct drm_device * dev)
2018 {
2019 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2020 	int pipe;
2021 
2022 	if (!dev_priv)
2023 		return;
2024 
2025 	dev_priv->vblank_pipe = 0;
2026 
2027 	if (I915_HAS_HOTPLUG(dev)) {
2028 		I915_WRITE(PORT_HOTPLUG_EN, 0);
2029 		I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2030 	}
2031 
2032 	I915_WRITE(HWSTAM, 0xffffffff);
2033 	for_each_pipe(pipe)
2034 		I915_WRITE(PIPESTAT(pipe), 0);
2035 	I915_WRITE(IMR, 0xffffffff);
2036 	I915_WRITE(IER, 0x0);
2037 
2038 	for_each_pipe(pipe)
2039 		I915_WRITE(PIPESTAT(pipe),
2040 			   I915_READ(PIPESTAT(pipe)) & 0x8000ffff);
2041 	I915_WRITE(IIR, I915_READ(IIR));
2042 }
2043 
2044 void intel_irq_init(struct drm_device *dev)
2045 {
2046 	dev->driver->get_vblank_counter = i915_get_vblank_counter;
2047 	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
2048 	if (IS_G4X(dev) || IS_GEN5(dev) || IS_GEN6(dev) || IS_IVYBRIDGE(dev)) {
2049 		dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
2050 		dev->driver->get_vblank_counter = gm45_get_vblank_counter;
2051 	}
2052 
2053 
2054 	dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
2055 	dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
2056 
2057 	if (IS_IVYBRIDGE(dev)) {
2058 		/* Share pre & uninstall handlers with ILK/SNB */
2059 		dev->driver->irq_handler = ivybridge_irq_handler;
2060 		dev->driver->irq_preinstall = ironlake_irq_preinstall;
2061 		dev->driver->irq_postinstall = ivybridge_irq_postinstall;
2062 		dev->driver->irq_uninstall = ironlake_irq_uninstall;
2063 		dev->driver->enable_vblank = ivybridge_enable_vblank;
2064 		dev->driver->disable_vblank = ivybridge_disable_vblank;
2065 	} else if (HAS_PCH_SPLIT(dev)) {
2066 		dev->driver->irq_handler = ironlake_irq_handler;
2067 		dev->driver->irq_preinstall = ironlake_irq_preinstall;
2068 		dev->driver->irq_postinstall = ironlake_irq_postinstall;
2069 		dev->driver->irq_uninstall = ironlake_irq_uninstall;
2070 		dev->driver->enable_vblank = ironlake_enable_vblank;
2071 		dev->driver->disable_vblank = ironlake_disable_vblank;
2072 	} else {
2073 		dev->driver->irq_preinstall = i915_driver_irq_preinstall;
2074 		dev->driver->irq_postinstall = i915_driver_irq_postinstall;
2075 		dev->driver->irq_uninstall = i915_driver_irq_uninstall;
2076 		dev->driver->irq_handler = i915_driver_irq_handler;
2077 		dev->driver->enable_vblank = i915_enable_vblank;
2078 		dev->driver->disable_vblank = i915_disable_vblank;
2079 	}
2080 }
2081