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/drivers/gpu/drm/i915/i915_irq.c

https://bitbucket.org/olivier_pitton/linux-3.8
C | 2884 lines | 2069 code | 518 blank | 297 comment | 351 complexity | ff3c660d5ab32dbf46996a4c893614ea MD5 | raw file

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   1/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2 */
   3/*
   4 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5 * All Rights Reserved.
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a
   8 * copy of this software and associated documentation files (the
   9 * "Software"), to deal in the Software without restriction, including
  10 * without limitation the rights to use, copy, modify, merge, publish,
  11 * distribute, sub license, and/or sell copies of the Software, and to
  12 * permit persons to whom the Software is furnished to do so, subject to
  13 * the following conditions:
  14 *
  15 * The above copyright notice and this permission notice (including the
  16 * next paragraph) shall be included in all copies or substantial portions
  17 * of the Software.
  18 *
  19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 *
  27 */
  28
  29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31#include <linux/sysrq.h>
  32#include <linux/slab.h>
  33#include <drm/drmP.h>
  34#include <drm/i915_drm.h>
  35#include "i915_drv.h"
  36#include "i915_trace.h"
  37#include "intel_drv.h"
  38
  39/* For display hotplug interrupt */
  40static void
  41ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  42{
  43	if ((dev_priv->irq_mask & mask) != 0) {
  44		dev_priv->irq_mask &= ~mask;
  45		I915_WRITE(DEIMR, dev_priv->irq_mask);
  46		POSTING_READ(DEIMR);
  47	}
  48}
  49
  50static inline void
  51ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  52{
  53	if ((dev_priv->irq_mask & mask) != mask) {
  54		dev_priv->irq_mask |= mask;
  55		I915_WRITE(DEIMR, dev_priv->irq_mask);
  56		POSTING_READ(DEIMR);
  57	}
  58}
  59
  60void
  61i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
  62{
  63	if ((dev_priv->pipestat[pipe] & mask) != mask) {
  64		u32 reg = PIPESTAT(pipe);
  65
  66		dev_priv->pipestat[pipe] |= mask;
  67		/* Enable the interrupt, clear any pending status */
  68		I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
  69		POSTING_READ(reg);
  70	}
  71}
  72
  73void
  74i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
  75{
  76	if ((dev_priv->pipestat[pipe] & mask) != 0) {
  77		u32 reg = PIPESTAT(pipe);
  78
  79		dev_priv->pipestat[pipe] &= ~mask;
  80		I915_WRITE(reg, dev_priv->pipestat[pipe]);
  81		POSTING_READ(reg);
  82	}
  83}
  84
  85/**
  86 * intel_enable_asle - enable ASLE interrupt for OpRegion
  87 */
  88void intel_enable_asle(struct drm_device *dev)
  89{
  90	drm_i915_private_t *dev_priv = dev->dev_private;
  91	unsigned long irqflags;
  92
  93	/* FIXME: opregion/asle for VLV */
  94	if (IS_VALLEYVIEW(dev))
  95		return;
  96
  97	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
  98
  99	if (HAS_PCH_SPLIT(dev))
 100		ironlake_enable_display_irq(dev_priv, DE_GSE);
 101	else {
 102		i915_enable_pipestat(dev_priv, 1,
 103				     PIPE_LEGACY_BLC_EVENT_ENABLE);
 104		if (INTEL_INFO(dev)->gen >= 4)
 105			i915_enable_pipestat(dev_priv, 0,
 106					     PIPE_LEGACY_BLC_EVENT_ENABLE);
 107	}
 108
 109	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 110}
 111
 112/**
 113 * i915_pipe_enabled - check if a pipe is enabled
 114 * @dev: DRM device
 115 * @pipe: pipe to check
 116 *
 117 * Reading certain registers when the pipe is disabled can hang the chip.
 118 * Use this routine to make sure the PLL is running and the pipe is active
 119 * before reading such registers if unsure.
 120 */
 121static int
 122i915_pipe_enabled(struct drm_device *dev, int pipe)
 123{
 124	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 125	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
 126								      pipe);
 127
 128	return I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_ENABLE;
 129}
 130
 131/* Called from drm generic code, passed a 'crtc', which
 132 * we use as a pipe index
 133 */
 134static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 135{
 136	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 137	unsigned long high_frame;
 138	unsigned long low_frame;
 139	u32 high1, high2, low;
 140
 141	if (!i915_pipe_enabled(dev, pipe)) {
 142		DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 143				"pipe %c\n", pipe_name(pipe));
 144		return 0;
 145	}
 146
 147	high_frame = PIPEFRAME(pipe);
 148	low_frame = PIPEFRAMEPIXEL(pipe);
 149
 150	/*
 151	 * High & low register fields aren't synchronized, so make sure
 152	 * we get a low value that's stable across two reads of the high
 153	 * register.
 154	 */
 155	do {
 156		high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 157		low   = I915_READ(low_frame)  & PIPE_FRAME_LOW_MASK;
 158		high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
 159	} while (high1 != high2);
 160
 161	high1 >>= PIPE_FRAME_HIGH_SHIFT;
 162	low >>= PIPE_FRAME_LOW_SHIFT;
 163	return (high1 << 8) | low;
 164}
 165
 166static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 167{
 168	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 169	int reg = PIPE_FRMCOUNT_GM45(pipe);
 170
 171	if (!i915_pipe_enabled(dev, pipe)) {
 172		DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
 173				 "pipe %c\n", pipe_name(pipe));
 174		return 0;
 175	}
 176
 177	return I915_READ(reg);
 178}
 179
 180static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
 181			     int *vpos, int *hpos)
 182{
 183	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 184	u32 vbl = 0, position = 0;
 185	int vbl_start, vbl_end, htotal, vtotal;
 186	bool in_vbl = true;
 187	int ret = 0;
 188	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
 189								      pipe);
 190
 191	if (!i915_pipe_enabled(dev, pipe)) {
 192		DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
 193				 "pipe %c\n", pipe_name(pipe));
 194		return 0;
 195	}
 196
 197	/* Get vtotal. */
 198	vtotal = 1 + ((I915_READ(VTOTAL(cpu_transcoder)) >> 16) & 0x1fff);
 199
 200	if (INTEL_INFO(dev)->gen >= 4) {
 201		/* No obvious pixelcount register. Only query vertical
 202		 * scanout position from Display scan line register.
 203		 */
 204		position = I915_READ(PIPEDSL(pipe));
 205
 206		/* Decode into vertical scanout position. Don't have
 207		 * horizontal scanout position.
 208		 */
 209		*vpos = position & 0x1fff;
 210		*hpos = 0;
 211	} else {
 212		/* Have access to pixelcount since start of frame.
 213		 * We can split this into vertical and horizontal
 214		 * scanout position.
 215		 */
 216		position = (I915_READ(PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
 217
 218		htotal = 1 + ((I915_READ(HTOTAL(cpu_transcoder)) >> 16) & 0x1fff);
 219		*vpos = position / htotal;
 220		*hpos = position - (*vpos * htotal);
 221	}
 222
 223	/* Query vblank area. */
 224	vbl = I915_READ(VBLANK(cpu_transcoder));
 225
 226	/* Test position against vblank region. */
 227	vbl_start = vbl & 0x1fff;
 228	vbl_end = (vbl >> 16) & 0x1fff;
 229
 230	if ((*vpos < vbl_start) || (*vpos > vbl_end))
 231		in_vbl = false;
 232
 233	/* Inside "upper part" of vblank area? Apply corrective offset: */
 234	if (in_vbl && (*vpos >= vbl_start))
 235		*vpos = *vpos - vtotal;
 236
 237	/* Readouts valid? */
 238	if (vbl > 0)
 239		ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
 240
 241	/* In vblank? */
 242	if (in_vbl)
 243		ret |= DRM_SCANOUTPOS_INVBL;
 244
 245	return ret;
 246}
 247
 248static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
 249			      int *max_error,
 250			      struct timeval *vblank_time,
 251			      unsigned flags)
 252{
 253	struct drm_i915_private *dev_priv = dev->dev_private;
 254	struct drm_crtc *crtc;
 255
 256	if (pipe < 0 || pipe >= dev_priv->num_pipe) {
 257		DRM_ERROR("Invalid crtc %d\n", pipe);
 258		return -EINVAL;
 259	}
 260
 261	/* Get drm_crtc to timestamp: */
 262	crtc = intel_get_crtc_for_pipe(dev, pipe);
 263	if (crtc == NULL) {
 264		DRM_ERROR("Invalid crtc %d\n", pipe);
 265		return -EINVAL;
 266	}
 267
 268	if (!crtc->enabled) {
 269		DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
 270		return -EBUSY;
 271	}
 272
 273	/* Helper routine in DRM core does all the work: */
 274	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
 275						     vblank_time, flags,
 276						     crtc);
 277}
 278
 279/*
 280 * Handle hotplug events outside the interrupt handler proper.
 281 */
 282static void i915_hotplug_work_func(struct work_struct *work)
 283{
 284	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 285						    hotplug_work);
 286	struct drm_device *dev = dev_priv->dev;
 287	struct drm_mode_config *mode_config = &dev->mode_config;
 288	struct intel_encoder *encoder;
 289
 290	/* HPD irq before everything is fully set up. */
 291	if (!dev_priv->enable_hotplug_processing)
 292		return;
 293
 294	mutex_lock(&mode_config->mutex);
 295	DRM_DEBUG_KMS("running encoder hotplug functions\n");
 296
 297	list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
 298		if (encoder->hot_plug)
 299			encoder->hot_plug(encoder);
 300
 301	mutex_unlock(&mode_config->mutex);
 302
 303	/* Just fire off a uevent and let userspace tell us what to do */
 304	drm_helper_hpd_irq_event(dev);
 305}
 306
 307static void ironlake_handle_rps_change(struct drm_device *dev)
 308{
 309	drm_i915_private_t *dev_priv = dev->dev_private;
 310	u32 busy_up, busy_down, max_avg, min_avg;
 311	u8 new_delay;
 312	unsigned long flags;
 313
 314	spin_lock_irqsave(&mchdev_lock, flags);
 315
 316	I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
 317
 318	new_delay = dev_priv->ips.cur_delay;
 319
 320	I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
 321	busy_up = I915_READ(RCPREVBSYTUPAVG);
 322	busy_down = I915_READ(RCPREVBSYTDNAVG);
 323	max_avg = I915_READ(RCBMAXAVG);
 324	min_avg = I915_READ(RCBMINAVG);
 325
 326	/* Handle RCS change request from hw */
 327	if (busy_up > max_avg) {
 328		if (dev_priv->ips.cur_delay != dev_priv->ips.max_delay)
 329			new_delay = dev_priv->ips.cur_delay - 1;
 330		if (new_delay < dev_priv->ips.max_delay)
 331			new_delay = dev_priv->ips.max_delay;
 332	} else if (busy_down < min_avg) {
 333		if (dev_priv->ips.cur_delay != dev_priv->ips.min_delay)
 334			new_delay = dev_priv->ips.cur_delay + 1;
 335		if (new_delay > dev_priv->ips.min_delay)
 336			new_delay = dev_priv->ips.min_delay;
 337	}
 338
 339	if (ironlake_set_drps(dev, new_delay))
 340		dev_priv->ips.cur_delay = new_delay;
 341
 342	spin_unlock_irqrestore(&mchdev_lock, flags);
 343
 344	return;
 345}
 346
 347static void notify_ring(struct drm_device *dev,
 348			struct intel_ring_buffer *ring)
 349{
 350	struct drm_i915_private *dev_priv = dev->dev_private;
 351
 352	if (ring->obj == NULL)
 353		return;
 354
 355	trace_i915_gem_request_complete(ring, ring->get_seqno(ring, false));
 356
 357	wake_up_all(&ring->irq_queue);
 358	if (i915_enable_hangcheck) {
 359		dev_priv->gpu_error.hangcheck_count = 0;
 360		mod_timer(&dev_priv->gpu_error.hangcheck_timer,
 361			  round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES));
 362	}
 363}
 364
 365static void gen6_pm_rps_work(struct work_struct *work)
 366{
 367	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 368						    rps.work);
 369	u32 pm_iir, pm_imr;
 370	u8 new_delay;
 371
 372	spin_lock_irq(&dev_priv->rps.lock);
 373	pm_iir = dev_priv->rps.pm_iir;
 374	dev_priv->rps.pm_iir = 0;
 375	pm_imr = I915_READ(GEN6_PMIMR);
 376	I915_WRITE(GEN6_PMIMR, 0);
 377	spin_unlock_irq(&dev_priv->rps.lock);
 378
 379	if ((pm_iir & GEN6_PM_DEFERRED_EVENTS) == 0)
 380		return;
 381
 382	mutex_lock(&dev_priv->rps.hw_lock);
 383
 384	if (pm_iir & GEN6_PM_RP_UP_THRESHOLD)
 385		new_delay = dev_priv->rps.cur_delay + 1;
 386	else
 387		new_delay = dev_priv->rps.cur_delay - 1;
 388
 389	/* sysfs frequency interfaces may have snuck in while servicing the
 390	 * interrupt
 391	 */
 392	if (!(new_delay > dev_priv->rps.max_delay ||
 393	      new_delay < dev_priv->rps.min_delay)) {
 394		gen6_set_rps(dev_priv->dev, new_delay);
 395	}
 396
 397	mutex_unlock(&dev_priv->rps.hw_lock);
 398}
 399
 400
 401/**
 402 * ivybridge_parity_work - Workqueue called when a parity error interrupt
 403 * occurred.
 404 * @work: workqueue struct
 405 *
 406 * Doesn't actually do anything except notify userspace. As a consequence of
 407 * this event, userspace should try to remap the bad rows since statistically
 408 * it is likely the same row is more likely to go bad again.
 409 */
 410static void ivybridge_parity_work(struct work_struct *work)
 411{
 412	drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 413						    l3_parity.error_work);
 414	u32 error_status, row, bank, subbank;
 415	char *parity_event[5];
 416	uint32_t misccpctl;
 417	unsigned long flags;
 418
 419	/* We must turn off DOP level clock gating to access the L3 registers.
 420	 * In order to prevent a get/put style interface, acquire struct mutex
 421	 * any time we access those registers.
 422	 */
 423	mutex_lock(&dev_priv->dev->struct_mutex);
 424
 425	misccpctl = I915_READ(GEN7_MISCCPCTL);
 426	I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
 427	POSTING_READ(GEN7_MISCCPCTL);
 428
 429	error_status = I915_READ(GEN7_L3CDERRST1);
 430	row = GEN7_PARITY_ERROR_ROW(error_status);
 431	bank = GEN7_PARITY_ERROR_BANK(error_status);
 432	subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);
 433
 434	I915_WRITE(GEN7_L3CDERRST1, GEN7_PARITY_ERROR_VALID |
 435				    GEN7_L3CDERRST1_ENABLE);
 436	POSTING_READ(GEN7_L3CDERRST1);
 437
 438	I915_WRITE(GEN7_MISCCPCTL, misccpctl);
 439
 440	spin_lock_irqsave(&dev_priv->irq_lock, flags);
 441	dev_priv->gt_irq_mask &= ~GT_GEN7_L3_PARITY_ERROR_INTERRUPT;
 442	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
 443	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 444
 445	mutex_unlock(&dev_priv->dev->struct_mutex);
 446
 447	parity_event[0] = "L3_PARITY_ERROR=1";
 448	parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row);
 449	parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank);
 450	parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank);
 451	parity_event[4] = NULL;
 452
 453	kobject_uevent_env(&dev_priv->dev->primary->kdev.kobj,
 454			   KOBJ_CHANGE, parity_event);
 455
 456	DRM_DEBUG("Parity error: Row = %d, Bank = %d, Sub bank = %d.\n",
 457		  row, bank, subbank);
 458
 459	kfree(parity_event[3]);
 460	kfree(parity_event[2]);
 461	kfree(parity_event[1]);
 462}
 463
 464static void ivybridge_handle_parity_error(struct drm_device *dev)
 465{
 466	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 467	unsigned long flags;
 468
 469	if (!HAS_L3_GPU_CACHE(dev))
 470		return;
 471
 472	spin_lock_irqsave(&dev_priv->irq_lock, flags);
 473	dev_priv->gt_irq_mask |= GT_GEN7_L3_PARITY_ERROR_INTERRUPT;
 474	I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
 475	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
 476
 477	queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work);
 478}
 479
 480static void snb_gt_irq_handler(struct drm_device *dev,
 481			       struct drm_i915_private *dev_priv,
 482			       u32 gt_iir)
 483{
 484
 485	if (gt_iir & (GEN6_RENDER_USER_INTERRUPT |
 486		      GEN6_RENDER_PIPE_CONTROL_NOTIFY_INTERRUPT))
 487		notify_ring(dev, &dev_priv->ring[RCS]);
 488	if (gt_iir & GEN6_BSD_USER_INTERRUPT)
 489		notify_ring(dev, &dev_priv->ring[VCS]);
 490	if (gt_iir & GEN6_BLITTER_USER_INTERRUPT)
 491		notify_ring(dev, &dev_priv->ring[BCS]);
 492
 493	if (gt_iir & (GT_GEN6_BLT_CS_ERROR_INTERRUPT |
 494		      GT_GEN6_BSD_CS_ERROR_INTERRUPT |
 495		      GT_RENDER_CS_ERROR_INTERRUPT)) {
 496		DRM_ERROR("GT error interrupt 0x%08x\n", gt_iir);
 497		i915_handle_error(dev, false);
 498	}
 499
 500	if (gt_iir & GT_GEN7_L3_PARITY_ERROR_INTERRUPT)
 501		ivybridge_handle_parity_error(dev);
 502}
 503
 504static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
 505				u32 pm_iir)
 506{
 507	unsigned long flags;
 508
 509	/*
 510	 * IIR bits should never already be set because IMR should
 511	 * prevent an interrupt from being shown in IIR. The warning
 512	 * displays a case where we've unsafely cleared
 513	 * dev_priv->rps.pm_iir. Although missing an interrupt of the same
 514	 * type is not a problem, it displays a problem in the logic.
 515	 *
 516	 * The mask bit in IMR is cleared by dev_priv->rps.work.
 517	 */
 518
 519	spin_lock_irqsave(&dev_priv->rps.lock, flags);
 520	dev_priv->rps.pm_iir |= pm_iir;
 521	I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
 522	POSTING_READ(GEN6_PMIMR);
 523	spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
 524
 525	queue_work(dev_priv->wq, &dev_priv->rps.work);
 526}
 527
 528static void gmbus_irq_handler(struct drm_device *dev)
 529{
 530	struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
 531
 532	wake_up_all(&dev_priv->gmbus_wait_queue);
 533}
 534
 535static void dp_aux_irq_handler(struct drm_device *dev)
 536{
 537	struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
 538
 539	wake_up_all(&dev_priv->gmbus_wait_queue);
 540}
 541
 542static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 543{
 544	struct drm_device *dev = (struct drm_device *) arg;
 545	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 546	u32 iir, gt_iir, pm_iir;
 547	irqreturn_t ret = IRQ_NONE;
 548	unsigned long irqflags;
 549	int pipe;
 550	u32 pipe_stats[I915_MAX_PIPES];
 551
 552	atomic_inc(&dev_priv->irq_received);
 553
 554	while (true) {
 555		iir = I915_READ(VLV_IIR);
 556		gt_iir = I915_READ(GTIIR);
 557		pm_iir = I915_READ(GEN6_PMIIR);
 558
 559		if (gt_iir == 0 && pm_iir == 0 && iir == 0)
 560			goto out;
 561
 562		ret = IRQ_HANDLED;
 563
 564		snb_gt_irq_handler(dev, dev_priv, gt_iir);
 565
 566		spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 567		for_each_pipe(pipe) {
 568			int reg = PIPESTAT(pipe);
 569			pipe_stats[pipe] = I915_READ(reg);
 570
 571			/*
 572			 * Clear the PIPE*STAT regs before the IIR
 573			 */
 574			if (pipe_stats[pipe] & 0x8000ffff) {
 575				if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
 576					DRM_DEBUG_DRIVER("pipe %c underrun\n",
 577							 pipe_name(pipe));
 578				I915_WRITE(reg, pipe_stats[pipe]);
 579			}
 580		}
 581		spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 582
 583		for_each_pipe(pipe) {
 584			if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
 585				drm_handle_vblank(dev, pipe);
 586
 587			if (pipe_stats[pipe] & PLANE_FLIPDONE_INT_STATUS_VLV) {
 588				intel_prepare_page_flip(dev, pipe);
 589				intel_finish_page_flip(dev, pipe);
 590			}
 591		}
 592
 593		/* Consume port.  Then clear IIR or we'll miss events */
 594		if (iir & I915_DISPLAY_PORT_INTERRUPT) {
 595			u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
 596
 597			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 598					 hotplug_status);
 599			if (hotplug_status & dev_priv->hotplug_supported_mask)
 600				queue_work(dev_priv->wq,
 601					   &dev_priv->hotplug_work);
 602
 603			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 604			I915_READ(PORT_HOTPLUG_STAT);
 605		}
 606
 607		if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
 608			gmbus_irq_handler(dev);
 609
 610		if (pm_iir & GEN6_PM_DEFERRED_EVENTS)
 611			gen6_queue_rps_work(dev_priv, pm_iir);
 612
 613		I915_WRITE(GTIIR, gt_iir);
 614		I915_WRITE(GEN6_PMIIR, pm_iir);
 615		I915_WRITE(VLV_IIR, iir);
 616	}
 617
 618out:
 619	return ret;
 620}
 621
 622static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 623{
 624	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 625	int pipe;
 626
 627	if (pch_iir & SDE_HOTPLUG_MASK)
 628		queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 629
 630	if (pch_iir & SDE_AUDIO_POWER_MASK)
 631		DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
 632				 (pch_iir & SDE_AUDIO_POWER_MASK) >>
 633				 SDE_AUDIO_POWER_SHIFT);
 634
 635	if (pch_iir & SDE_AUX_MASK)
 636		dp_aux_irq_handler(dev);
 637
 638	if (pch_iir & SDE_GMBUS)
 639		gmbus_irq_handler(dev);
 640
 641	if (pch_iir & SDE_AUDIO_HDCP_MASK)
 642		DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
 643
 644	if (pch_iir & SDE_AUDIO_TRANS_MASK)
 645		DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
 646
 647	if (pch_iir & SDE_POISON)
 648		DRM_ERROR("PCH poison interrupt\n");
 649
 650	if (pch_iir & SDE_FDI_MASK)
 651		for_each_pipe(pipe)
 652			DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
 653					 pipe_name(pipe),
 654					 I915_READ(FDI_RX_IIR(pipe)));
 655
 656	if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
 657		DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
 658
 659	if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
 660		DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
 661
 662	if (pch_iir & SDE_TRANSB_FIFO_UNDER)
 663		DRM_DEBUG_DRIVER("PCH transcoder B underrun interrupt\n");
 664	if (pch_iir & SDE_TRANSA_FIFO_UNDER)
 665		DRM_DEBUG_DRIVER("PCH transcoder A underrun interrupt\n");
 666}
 667
 668static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 669{
 670	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 671	int pipe;
 672
 673	if (pch_iir & SDE_HOTPLUG_MASK_CPT)
 674		queue_work(dev_priv->wq, &dev_priv->hotplug_work);
 675
 676	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT)
 677		DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
 678				 (pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
 679				 SDE_AUDIO_POWER_SHIFT_CPT);
 680
 681	if (pch_iir & SDE_AUX_MASK_CPT)
 682		dp_aux_irq_handler(dev);
 683
 684	if (pch_iir & SDE_GMBUS_CPT)
 685		gmbus_irq_handler(dev);
 686
 687	if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
 688		DRM_DEBUG_DRIVER("Audio CP request interrupt\n");
 689
 690	if (pch_iir & SDE_AUDIO_CP_CHG_CPT)
 691		DRM_DEBUG_DRIVER("Audio CP change interrupt\n");
 692
 693	if (pch_iir & SDE_FDI_MASK_CPT)
 694		for_each_pipe(pipe)
 695			DRM_DEBUG_DRIVER("  pipe %c FDI IIR: 0x%08x\n",
 696					 pipe_name(pipe),
 697					 I915_READ(FDI_RX_IIR(pipe)));
 698}
 699
 700static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
 701{
 702	struct drm_device *dev = (struct drm_device *) arg;
 703	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 704	u32 de_iir, gt_iir, de_ier, pm_iir;
 705	irqreturn_t ret = IRQ_NONE;
 706	int i;
 707
 708	atomic_inc(&dev_priv->irq_received);
 709
 710	/* disable master interrupt before clearing iir  */
 711	de_ier = I915_READ(DEIER);
 712	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
 713
 714	gt_iir = I915_READ(GTIIR);
 715	if (gt_iir) {
 716		snb_gt_irq_handler(dev, dev_priv, gt_iir);
 717		I915_WRITE(GTIIR, gt_iir);
 718		ret = IRQ_HANDLED;
 719	}
 720
 721	de_iir = I915_READ(DEIIR);
 722	if (de_iir) {
 723		if (de_iir & DE_AUX_CHANNEL_A_IVB)
 724			dp_aux_irq_handler(dev);
 725
 726		if (de_iir & DE_GSE_IVB)
 727			intel_opregion_gse_intr(dev);
 728
 729		for (i = 0; i < 3; i++) {
 730			if (de_iir & (DE_PIPEA_VBLANK_IVB << (5 * i)))
 731				drm_handle_vblank(dev, i);
 732			if (de_iir & (DE_PLANEA_FLIP_DONE_IVB << (5 * i))) {
 733				intel_prepare_page_flip(dev, i);
 734				intel_finish_page_flip_plane(dev, i);
 735			}
 736		}
 737
 738		/* check event from PCH */
 739		if (de_iir & DE_PCH_EVENT_IVB) {
 740			u32 pch_iir = I915_READ(SDEIIR);
 741
 742			cpt_irq_handler(dev, pch_iir);
 743
 744			/* clear PCH hotplug event before clear CPU irq */
 745			I915_WRITE(SDEIIR, pch_iir);
 746		}
 747
 748		I915_WRITE(DEIIR, de_iir);
 749		ret = IRQ_HANDLED;
 750	}
 751
 752	pm_iir = I915_READ(GEN6_PMIIR);
 753	if (pm_iir) {
 754		if (pm_iir & GEN6_PM_DEFERRED_EVENTS)
 755			gen6_queue_rps_work(dev_priv, pm_iir);
 756		I915_WRITE(GEN6_PMIIR, pm_iir);
 757		ret = IRQ_HANDLED;
 758	}
 759
 760	I915_WRITE(DEIER, de_ier);
 761	POSTING_READ(DEIER);
 762
 763	return ret;
 764}
 765
 766static void ilk_gt_irq_handler(struct drm_device *dev,
 767			       struct drm_i915_private *dev_priv,
 768			       u32 gt_iir)
 769{
 770	if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))
 771		notify_ring(dev, &dev_priv->ring[RCS]);
 772	if (gt_iir & GT_BSD_USER_INTERRUPT)
 773		notify_ring(dev, &dev_priv->ring[VCS]);
 774}
 775
 776static irqreturn_t ironlake_irq_handler(int irq, void *arg)
 777{
 778	struct drm_device *dev = (struct drm_device *) arg;
 779	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 780	int ret = IRQ_NONE;
 781	u32 de_iir, gt_iir, de_ier, pm_iir;
 782
 783	atomic_inc(&dev_priv->irq_received);
 784
 785	/* disable master interrupt before clearing iir  */
 786	de_ier = I915_READ(DEIER);
 787	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
 788	POSTING_READ(DEIER);
 789
 790	de_iir = I915_READ(DEIIR);
 791	gt_iir = I915_READ(GTIIR);
 792	pm_iir = I915_READ(GEN6_PMIIR);
 793
 794	if (de_iir == 0 && gt_iir == 0 && (!IS_GEN6(dev) || pm_iir == 0))
 795		goto done;
 796
 797	ret = IRQ_HANDLED;
 798
 799	if (IS_GEN5(dev))
 800		ilk_gt_irq_handler(dev, dev_priv, gt_iir);
 801	else
 802		snb_gt_irq_handler(dev, dev_priv, gt_iir);
 803
 804	if (de_iir & DE_AUX_CHANNEL_A)
 805		dp_aux_irq_handler(dev);
 806
 807	if (de_iir & DE_GSE)
 808		intel_opregion_gse_intr(dev);
 809
 810	if (de_iir & DE_PIPEA_VBLANK)
 811		drm_handle_vblank(dev, 0);
 812
 813	if (de_iir & DE_PIPEB_VBLANK)
 814		drm_handle_vblank(dev, 1);
 815
 816	if (de_iir & DE_PLANEA_FLIP_DONE) {
 817		intel_prepare_page_flip(dev, 0);
 818		intel_finish_page_flip_plane(dev, 0);
 819	}
 820
 821	if (de_iir & DE_PLANEB_FLIP_DONE) {
 822		intel_prepare_page_flip(dev, 1);
 823		intel_finish_page_flip_plane(dev, 1);
 824	}
 825
 826	/* check event from PCH */
 827	if (de_iir & DE_PCH_EVENT) {
 828		u32 pch_iir = I915_READ(SDEIIR);
 829
 830		if (HAS_PCH_CPT(dev))
 831			cpt_irq_handler(dev, pch_iir);
 832		else
 833			ibx_irq_handler(dev, pch_iir);
 834
 835		/* should clear PCH hotplug event before clear CPU irq */
 836		I915_WRITE(SDEIIR, pch_iir);
 837	}
 838
 839	if (IS_GEN5(dev) &&  de_iir & DE_PCU_EVENT)
 840		ironlake_handle_rps_change(dev);
 841
 842	if (IS_GEN6(dev) && pm_iir & GEN6_PM_DEFERRED_EVENTS)
 843		gen6_queue_rps_work(dev_priv, pm_iir);
 844
 845	I915_WRITE(GTIIR, gt_iir);
 846	I915_WRITE(DEIIR, de_iir);
 847	I915_WRITE(GEN6_PMIIR, pm_iir);
 848
 849done:
 850	I915_WRITE(DEIER, de_ier);
 851	POSTING_READ(DEIER);
 852
 853	return ret;
 854}
 855
 856/**
 857 * i915_error_work_func - do process context error handling work
 858 * @work: work struct
 859 *
 860 * Fire an error uevent so userspace can see that a hang or error
 861 * was detected.
 862 */
 863static void i915_error_work_func(struct work_struct *work)
 864{
 865	struct i915_gpu_error *error = container_of(work, struct i915_gpu_error,
 866						    work);
 867	drm_i915_private_t *dev_priv = container_of(error, drm_i915_private_t,
 868						    gpu_error);
 869	struct drm_device *dev = dev_priv->dev;
 870	struct intel_ring_buffer *ring;
 871	char *error_event[] = { "ERROR=1", NULL };
 872	char *reset_event[] = { "RESET=1", NULL };
 873	char *reset_done_event[] = { "ERROR=0", NULL };
 874	int i, ret;
 875
 876	kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, error_event);
 877
 878	/*
 879	 * Note that there's only one work item which does gpu resets, so we
 880	 * need not worry about concurrent gpu resets potentially incrementing
 881	 * error->reset_counter twice. We only need to take care of another
 882	 * racing irq/hangcheck declaring the gpu dead for a second time. A
 883	 * quick check for that is good enough: schedule_work ensures the
 884	 * correct ordering between hang detection and this work item, and since
 885	 * the reset in-progress bit is only ever set by code outside of this
 886	 * work we don't need to worry about any other races.
 887	 */
 888	if (i915_reset_in_progress(error) && !i915_terminally_wedged(error)) {
 889		DRM_DEBUG_DRIVER("resetting chip\n");
 890		kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE,
 891				   reset_event);
 892
 893		ret = i915_reset(dev);
 894
 895		if (ret == 0) {
 896			/*
 897			 * After all the gem state is reset, increment the reset
 898			 * counter and wake up everyone waiting for the reset to
 899			 * complete.
 900			 *
 901			 * Since unlock operations are a one-sided barrier only,
 902			 * we need to insert a barrier here to order any seqno
 903			 * updates before
 904			 * the counter increment.
 905			 */
 906			smp_mb__before_atomic_inc();
 907			atomic_inc(&dev_priv->gpu_error.reset_counter);
 908
 909			kobject_uevent_env(&dev->primary->kdev.kobj,
 910					   KOBJ_CHANGE, reset_done_event);
 911		} else {
 912			atomic_set(&error->reset_counter, I915_WEDGED);
 913		}
 914
 915		for_each_ring(ring, dev_priv, i)
 916			wake_up_all(&ring->irq_queue);
 917
 918		wake_up_all(&dev_priv->gpu_error.reset_queue);
 919	}
 920}
 921
 922/* NB: please notice the memset */
 923static void i915_get_extra_instdone(struct drm_device *dev,
 924				    uint32_t *instdone)
 925{
 926	struct drm_i915_private *dev_priv = dev->dev_private;
 927	memset(instdone, 0, sizeof(*instdone) * I915_NUM_INSTDONE_REG);
 928
 929	switch(INTEL_INFO(dev)->gen) {
 930	case 2:
 931	case 3:
 932		instdone[0] = I915_READ(INSTDONE);
 933		break;
 934	case 4:
 935	case 5:
 936	case 6:
 937		instdone[0] = I915_READ(INSTDONE_I965);
 938		instdone[1] = I915_READ(INSTDONE1);
 939		break;
 940	default:
 941		WARN_ONCE(1, "Unsupported platform\n");
 942	case 7:
 943		instdone[0] = I915_READ(GEN7_INSTDONE_1);
 944		instdone[1] = I915_READ(GEN7_SC_INSTDONE);
 945		instdone[2] = I915_READ(GEN7_SAMPLER_INSTDONE);
 946		instdone[3] = I915_READ(GEN7_ROW_INSTDONE);
 947		break;
 948	}
 949}
 950
 951#ifdef CONFIG_DEBUG_FS
 952static struct drm_i915_error_object *
 953i915_error_object_create(struct drm_i915_private *dev_priv,
 954			 struct drm_i915_gem_object *src)
 955{
 956	struct drm_i915_error_object *dst;
 957	int i, count;
 958	u32 reloc_offset;
 959
 960	if (src == NULL || src->pages == NULL)
 961		return NULL;
 962
 963	count = src->base.size / PAGE_SIZE;
 964
 965	dst = kmalloc(sizeof(*dst) + count * sizeof(u32 *), GFP_ATOMIC);
 966	if (dst == NULL)
 967		return NULL;
 968
 969	reloc_offset = src->gtt_offset;
 970	for (i = 0; i < count; i++) {
 971		unsigned long flags;
 972		void *d;
 973
 974		d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
 975		if (d == NULL)
 976			goto unwind;
 977
 978		local_irq_save(flags);
 979		if (reloc_offset < dev_priv->gtt.mappable_end &&
 980		    src->has_global_gtt_mapping) {
 981			void __iomem *s;
 982
 983			/* Simply ignore tiling or any overlapping fence.
 984			 * It's part of the error state, and this hopefully
 985			 * captures what the GPU read.
 986			 */
 987
 988			s = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 989						     reloc_offset);
 990			memcpy_fromio(d, s, PAGE_SIZE);
 991			io_mapping_unmap_atomic(s);
 992		} else if (src->stolen) {
 993			unsigned long offset;
 994
 995			offset = dev_priv->mm.stolen_base;
 996			offset += src->stolen->start;
 997			offset += i << PAGE_SHIFT;
 998
 999			memcpy_fromio(d, (void __iomem *) offset, PAGE_SIZE);
1000		} else {
1001			struct page *page;
1002			void *s;
1003
1004			page = i915_gem_object_get_page(src, i);
1005
1006			drm_clflush_pages(&page, 1);
1007
1008			s = kmap_atomic(page);
1009			memcpy(d, s, PAGE_SIZE);
1010			kunmap_atomic(s);
1011
1012			drm_clflush_pages(&page, 1);
1013		}
1014		local_irq_restore(flags);
1015
1016		dst->pages[i] = d;
1017
1018		reloc_offset += PAGE_SIZE;
1019	}
1020	dst->page_count = count;
1021	dst->gtt_offset = src->gtt_offset;
1022
1023	return dst;
1024
1025unwind:
1026	while (i--)
1027		kfree(dst->pages[i]);
1028	kfree(dst);
1029	return NULL;
1030}
1031
1032static void
1033i915_error_object_free(struct drm_i915_error_object *obj)
1034{
1035	int page;
1036
1037	if (obj == NULL)
1038		return;
1039
1040	for (page = 0; page < obj->page_count; page++)
1041		kfree(obj->pages[page]);
1042
1043	kfree(obj);
1044}
1045
1046void
1047i915_error_state_free(struct kref *error_ref)
1048{
1049	struct drm_i915_error_state *error = container_of(error_ref,
1050							  typeof(*error), ref);
1051	int i;
1052
1053	for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
1054		i915_error_object_free(error->ring[i].batchbuffer);
1055		i915_error_object_free(error->ring[i].ringbuffer);
1056		kfree(error->ring[i].requests);
1057	}
1058
1059	kfree(error->active_bo);
1060	kfree(error->overlay);
1061	kfree(error);
1062}
1063static void capture_bo(struct drm_i915_error_buffer *err,
1064		       struct drm_i915_gem_object *obj)
1065{
1066	err->size = obj->base.size;
1067	err->name = obj->base.name;
1068	err->rseqno = obj->last_read_seqno;
1069	err->wseqno = obj->last_write_seqno;
1070	err->gtt_offset = obj->gtt_offset;
1071	err->read_domains = obj->base.read_domains;
1072	err->write_domain = obj->base.write_domain;
1073	err->fence_reg = obj->fence_reg;
1074	err->pinned = 0;
1075	if (obj->pin_count > 0)
1076		err->pinned = 1;
1077	if (obj->user_pin_count > 0)
1078		err->pinned = -1;
1079	err->tiling = obj->tiling_mode;
1080	err->dirty = obj->dirty;
1081	err->purgeable = obj->madv != I915_MADV_WILLNEED;
1082	err->ring = obj->ring ? obj->ring->id : -1;
1083	err->cache_level = obj->cache_level;
1084}
1085
1086static u32 capture_active_bo(struct drm_i915_error_buffer *err,
1087			     int count, struct list_head *head)
1088{
1089	struct drm_i915_gem_object *obj;
1090	int i = 0;
1091
1092	list_for_each_entry(obj, head, mm_list) {
1093		capture_bo(err++, obj);
1094		if (++i == count)
1095			break;
1096	}
1097
1098	return i;
1099}
1100
1101static u32 capture_pinned_bo(struct drm_i915_error_buffer *err,
1102			     int count, struct list_head *head)
1103{
1104	struct drm_i915_gem_object *obj;
1105	int i = 0;
1106
1107	list_for_each_entry(obj, head, gtt_list) {
1108		if (obj->pin_count == 0)
1109			continue;
1110
1111		capture_bo(err++, obj);
1112		if (++i == count)
1113			break;
1114	}
1115
1116	return i;
1117}
1118
1119static void i915_gem_record_fences(struct drm_device *dev,
1120				   struct drm_i915_error_state *error)
1121{
1122	struct drm_i915_private *dev_priv = dev->dev_private;
1123	int i;
1124
1125	/* Fences */
1126	switch (INTEL_INFO(dev)->gen) {
1127	case 7:
1128	case 6:
1129		for (i = 0; i < 16; i++)
1130			error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 + (i * 8));
1131		break;
1132	case 5:
1133	case 4:
1134		for (i = 0; i < 16; i++)
1135			error->fence[i] = I915_READ64(FENCE_REG_965_0 + (i * 8));
1136		break;
1137	case 3:
1138		if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
1139			for (i = 0; i < 8; i++)
1140				error->fence[i+8] = I915_READ(FENCE_REG_945_8 + (i * 4));
1141	case 2:
1142		for (i = 0; i < 8; i++)
1143			error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
1144		break;
1145
1146	default:
1147		BUG();
1148	}
1149}
1150
1151static struct drm_i915_error_object *
1152i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
1153			     struct intel_ring_buffer *ring)
1154{
1155	struct drm_i915_gem_object *obj;
1156	u32 seqno;
1157
1158	if (!ring->get_seqno)
1159		return NULL;
1160
1161	if (HAS_BROKEN_CS_TLB(dev_priv->dev)) {
1162		u32 acthd = I915_READ(ACTHD);
1163
1164		if (WARN_ON(ring->id != RCS))
1165			return NULL;
1166
1167		obj = ring->private;
1168		if (acthd >= obj->gtt_offset &&
1169		    acthd < obj->gtt_offset + obj->base.size)
1170			return i915_error_object_create(dev_priv, obj);
1171	}
1172
1173	seqno = ring->get_seqno(ring, false);
1174	list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
1175		if (obj->ring != ring)
1176			continue;
1177
1178		if (i915_seqno_passed(seqno, obj->last_read_seqno))
1179			continue;
1180
1181		if ((obj->base.read_domains & I915_GEM_DOMAIN_COMMAND) == 0)
1182			continue;
1183
1184		/* We need to copy these to an anonymous buffer as the simplest
1185		 * method to avoid being overwritten by userspace.
1186		 */
1187		return i915_error_object_create(dev_priv, obj);
1188	}
1189
1190	return NULL;
1191}
1192
1193static void i915_record_ring_state(struct drm_device *dev,
1194				   struct drm_i915_error_state *error,
1195				   struct intel_ring_buffer *ring)
1196{
1197	struct drm_i915_private *dev_priv = dev->dev_private;
1198
1199	if (INTEL_INFO(dev)->gen >= 6) {
1200		error->rc_psmi[ring->id] = I915_READ(ring->mmio_base + 0x50);
1201		error->fault_reg[ring->id] = I915_READ(RING_FAULT_REG(ring));
1202		error->semaphore_mboxes[ring->id][0]
1203			= I915_READ(RING_SYNC_0(ring->mmio_base));
1204		error->semaphore_mboxes[ring->id][1]
1205			= I915_READ(RING_SYNC_1(ring->mmio_base));
1206		error->semaphore_seqno[ring->id][0] = ring->sync_seqno[0];
1207		error->semaphore_seqno[ring->id][1] = ring->sync_seqno[1];
1208	}
1209
1210	if (INTEL_INFO(dev)->gen >= 4) {
1211		error->faddr[ring->id] = I915_READ(RING_DMA_FADD(ring->mmio_base));
1212		error->ipeir[ring->id] = I915_READ(RING_IPEIR(ring->mmio_base));
1213		error->ipehr[ring->id] = I915_READ(RING_IPEHR(ring->mmio_base));
1214		error->instdone[ring->id] = I915_READ(RING_INSTDONE(ring->mmio_base));
1215		error->instps[ring->id] = I915_READ(RING_INSTPS(ring->mmio_base));
1216		if (ring->id == RCS)
1217			error->bbaddr = I915_READ64(BB_ADDR);
1218	} else {
1219		error->faddr[ring->id] = I915_READ(DMA_FADD_I8XX);
1220		error->ipeir[ring->id] = I915_READ(IPEIR);
1221		error->ipehr[ring->id] = I915_READ(IPEHR);
1222		error->instdone[ring->id] = I915_READ(INSTDONE);
1223	}
1224
1225	error->waiting[ring->id] = waitqueue_active(&ring->irq_queue);
1226	error->instpm[ring->id] = I915_READ(RING_INSTPM(ring->mmio_base));
1227	error->seqno[ring->id] = ring->get_seqno(ring, false);
1228	error->acthd[ring->id] = intel_ring_get_active_head(ring);
1229	error->head[ring->id] = I915_READ_HEAD(ring);
1230	error->tail[ring->id] = I915_READ_TAIL(ring);
1231	error->ctl[ring->id] = I915_READ_CTL(ring);
1232
1233	error->cpu_ring_head[ring->id] = ring->head;
1234	error->cpu_ring_tail[ring->id] = ring->tail;
1235}
1236
1237static void i915_gem_record_rings(struct drm_device *dev,
1238				  struct drm_i915_error_state *error)
1239{
1240	struct drm_i915_private *dev_priv = dev->dev_private;
1241	struct intel_ring_buffer *ring;
1242	struct drm_i915_gem_request *request;
1243	int i, count;
1244
1245	for_each_ring(ring, dev_priv, i) {
1246		i915_record_ring_state(dev, error, ring);
1247
1248		error->ring[i].batchbuffer =
1249			i915_error_first_batchbuffer(dev_priv, ring);
1250
1251		error->ring[i].ringbuffer =
1252			i915_error_object_create(dev_priv, ring->obj);
1253
1254		count = 0;
1255		list_for_each_entry(request, &ring->request_list, list)
1256			count++;
1257
1258		error->ring[i].num_requests = count;
1259		error->ring[i].requests =
1260			kmalloc(count*sizeof(struct drm_i915_error_request),
1261				GFP_ATOMIC);
1262		if (error->ring[i].requests == NULL) {
1263			error->ring[i].num_requests = 0;
1264			continue;
1265		}
1266
1267		count = 0;
1268		list_for_each_entry(request, &ring->request_list, list) {
1269			struct drm_i915_error_request *erq;
1270
1271			erq = &error->ring[i].requests[count++];
1272			erq->seqno = request->seqno;
1273			erq->jiffies = request->emitted_jiffies;
1274			erq->tail = request->tail;
1275		}
1276	}
1277}
1278
1279/**
1280 * i915_capture_error_state - capture an error record for later analysis
1281 * @dev: drm device
1282 *
1283 * Should be called when an error is detected (either a hang or an error
1284 * interrupt) to capture error state from the time of the error.  Fills
1285 * out a structure which becomes available in debugfs for user level tools
1286 * to pick up.
1287 */
1288static void i915_capture_error_state(struct drm_device *dev)
1289{
1290	struct drm_i915_private *dev_priv = dev->dev_private;
1291	struct drm_i915_gem_object *obj;
1292	struct drm_i915_error_state *error;
1293	unsigned long flags;
1294	int i, pipe;
1295
1296	spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1297	error = dev_priv->gpu_error.first_error;
1298	spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1299	if (error)
1300		return;
1301
1302	/* Account for pipe specific data like PIPE*STAT */
1303	error = kzalloc(sizeof(*error), GFP_ATOMIC);
1304	if (!error) {
1305		DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1306		return;
1307	}
1308
1309	DRM_INFO("capturing error event; look for more information in"
1310		 "/sys/kernel/debug/dri/%d/i915_error_state\n",
1311		 dev->primary->index);
1312
1313	kref_init(&error->ref);
1314	error->eir = I915_READ(EIR);
1315	error->pgtbl_er = I915_READ(PGTBL_ER);
1316	error->ccid = I915_READ(CCID);
1317
1318	if (HAS_PCH_SPLIT(dev))
1319		error->ier = I915_READ(DEIER) | I915_READ(GTIER);
1320	else if (IS_VALLEYVIEW(dev))
1321		error->ier = I915_READ(GTIER) | I915_READ(VLV_IER);
1322	else if (IS_GEN2(dev))
1323		error->ier = I915_READ16(IER);
1324	else
1325		error->ier = I915_READ(IER);
1326
1327	if (INTEL_INFO(dev)->gen >= 6)
1328		error->derrmr = I915_READ(DERRMR);
1329
1330	if (IS_VALLEYVIEW(dev))
1331		error->forcewake = I915_READ(FORCEWAKE_VLV);
1332	else if (INTEL_INFO(dev)->gen >= 7)
1333		error->forcewake = I915_READ(FORCEWAKE_MT);
1334	else if (INTEL_INFO(dev)->gen == 6)
1335		error->forcewake = I915_READ(FORCEWAKE);
1336
1337	for_each_pipe(pipe)
1338		error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
1339
1340	if (INTEL_INFO(dev)->gen >= 6) {
1341		error->error = I915_READ(ERROR_GEN6);
1342		error->done_reg = I915_READ(DONE_REG);
1343	}
1344
1345	if (INTEL_INFO(dev)->gen == 7)
1346		error->err_int = I915_READ(GEN7_ERR_INT);
1347
1348	i915_get_extra_instdone(dev, error->extra_instdone);
1349
1350	i915_gem_record_fences(dev, error);
1351	i915_gem_record_rings(dev, error);
1352
1353	/* Record buffers on the active and pinned lists. */
1354	error->active_bo = NULL;
1355	error->pinned_bo = NULL;
1356
1357	i = 0;
1358	list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list)
1359		i++;
1360	error->active_bo_count = i;
1361	list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list)
1362		if (obj->pin_count)
1363			i++;
1364	error->pinned_bo_count = i - error->active_bo_count;
1365
1366	error->active_bo = NULL;
1367	error->pinned_bo = NULL;
1368	if (i) {
1369		error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
1370					   GFP_ATOMIC);
1371		if (error->active_bo)
1372			error->pinned_bo =
1373				error->active_bo + error->active_bo_count;
1374	}
1375
1376	if (error->active_bo)
1377		error->active_bo_count =
1378			capture_active_bo(error->active_bo,
1379					  error->active_bo_count,
1380					  &dev_priv->mm.active_list);
1381
1382	if (error->pinned_bo)
1383		error->pinned_bo_count =
1384			capture_pinned_bo(error->pinned_bo,
1385					  error->pinned_bo_count,
1386					  &dev_priv->mm.bound_list);
1387
1388	do_gettimeofday(&error->time);
1389
1390	error->overlay = intel_overlay_capture_error_state(dev);
1391	error->display = intel_display_capture_error_state(dev);
1392
1393	spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1394	if (dev_priv->gpu_error.first_error == NULL) {
1395		dev_priv->gpu_error.first_error = error;
1396		error = NULL;
1397	}
1398	spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1399
1400	if (error)
1401		i915_error_state_free(&error->ref);
1402}
1403
1404void i915_destroy_error_state(struct drm_device *dev)
1405{
1406	struct drm_i915_private *dev_priv = dev->dev_private;
1407	struct drm_i915_error_state *error;
1408	unsigned long flags;
1409
1410	spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1411	error = dev_priv->gpu_error.first_error;
1412	dev_priv->gpu_error.first_error = NULL;
1413	spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1414
1415	if (error)
1416		kref_put(&error->ref, i915_error_state_free);
1417}
1418#else
1419#define i915_capture_error_state(x)
1420#endif
1421
1422static void i915_report_and_clear_eir(struct drm_device *dev)
1423{
1424	struct drm_i915_private *dev_priv = dev->dev_private;
1425	uint32_t instdone[I915_NUM_INSTDONE_REG];
1426	u32 eir = I915_READ(EIR);
1427	int pipe, i;
1428
1429	if (!eir)
1430		return;
1431
1432	pr_err("render error detected, EIR: 0x%08x\n", eir);
1433
1434	i915_get_extra_instdone(dev, instdone);
1435
1436	if (IS_G4X(dev)) {
1437		if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
1438			u32 ipeir = I915_READ(IPEIR_I965);
1439
1440			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
1441			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
1442			for (i = 0; i < ARRAY_SIZE(instdone); i++)
1443				pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
1444			pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
1445			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
1446			I915_WRITE(IPEIR_I965, ipeir);
1447			POSTING_READ(IPEIR_I965);
1448		}
1449		if (eir & GM45_ERROR_PAGE_TABLE) {
1450			u32 pgtbl_err = I915_READ(PGTBL_ER);
1451			pr_err("page table error\n");
1452			pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
1453			I915_WRITE(PGTBL_ER, pgtbl_err);
1454			POSTING_READ(PGTBL_ER);
1455		}
1456	}
1457
1458	if (!IS_GEN2(dev)) {
1459		if (eir & I915_ERROR_PAGE_TABLE) {
1460			u32 pgtbl_err = I915_READ(PGTBL_ER);
1461			pr_err("page table error\n");
1462			pr_err("  PGTBL_ER: 0x%08x\n", pgtbl_err);
1463			I915_WRITE(PGTBL_ER, pgtbl_err);
1464			POSTING_READ(PGTBL_ER);
1465		}
1466	}
1467
1468	if (eir & I915_ERROR_MEMORY_REFRESH) {
1469		pr_err("memory refresh error:\n");
1470		for_each_pipe(pipe)
1471			pr_err("pipe %c stat: 0x%08x\n",
1472			       pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
1473		/* pipestat has already been acked */
1474	}
1475	if (eir & I915_ERROR_INSTRUCTION) {
1476		pr_err("instruction error\n");
1477		pr_err("  INSTPM: 0x%08x\n", I915_READ(INSTPM));
1478		for (i = 0; i < ARRAY_SIZE(instdone); i++)
1479			pr_err("  INSTDONE_%d: 0x%08x\n", i, instdone[i]);
1480		if (INTEL_INFO(dev)->gen < 4) {
1481			u32 ipeir = I915_READ(IPEIR);
1482
1483			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR));
1484			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR));
1485			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD));
1486			I915_WRITE(IPEIR, ipeir);
1487			POSTING_READ(IPEIR);
1488		} else {
1489			u32 ipeir = I915_READ(IPEIR_I965);
1490
1491			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
1492			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
1493			pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
1494			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
1495			I915_WRITE(IPEIR_I965, ipeir);
1496			POSTING_READ(IPEIR_I965);
1497		}
1498	}
1499
1500	I915_WRITE(EIR, eir);
1501	POSTING_READ(EIR);
1502	eir = I915_READ(EIR);
1503	if (eir) {
1504		/*
1505		 * some errors might have become stuck,
1506		 * mask them.
1507		 */
1508		DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
1509		I915_WRITE(EMR, I915_READ(EMR) | eir);
1510		I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
1511	}
1512}
1513
1514/**
1515 * i915_handle_error - handle an error interrupt
1516 * @dev: drm device
1517 *
1518 * Do some basic checking of regsiter state at error interrupt time and
1519 * dump it to the syslog.  Also call i915_capture_error_state() to make
1520 * sure we get a record and make it available in debugfs.  Fire a uevent
1521 * so userspace knows something bad happened (should trigger collection
1522 * of a ring dump etc.).
1523 */
1524void i915_handle_error(struct drm_device *dev, bool wedged)
1525{
1526	struct drm_i915_private *dev_priv = dev->dev_private;
1527	struct intel_ring_buffer *ring;
1528	int i;
1529
1530	i915_capture_error_state(dev);
1531	i915_report_and_clear_eir(dev);
1532
1533	if (wedged) {
1534		atomic_set_mask(I915_RESET_IN_PROGRESS_FLAG,
1535				&dev_priv->gpu_error.reset_counter);
1536
1537		/*
1538		 * Wakeup waiting processes so that the reset work item
1539		 * doesn't deadlock trying to grab various locks.
1540		 */
1541		for_each_ring(ring, dev_priv, i)
1542			wake_up_all(&ring->irq_queue);
1543	}
1544
1545	queue_work(dev_priv->wq, &dev_priv->gpu_error.work);
1546}
1547
1548static void i915_pageflip_stall_check(struct drm_device *dev, int pipe)
1549{
1550	drm_i915_private_t *dev_priv = dev->dev_private;
1551	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
1552	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
1553	struct drm_i915_gem_object *obj;
1554	struct intel_unpin_work *work;
1555	unsigned long flags;
1556	bool stall_detected;
1557
1558	/* Ignore early vblank irqs */
1559	if (intel_crtc == NULL)
1560		return;
1561
1562	spin_lock_irqsave(&dev->event_lock, flags);
1563	work = intel_crtc->unpin_work;
1564
1565	if (work == NULL ||
1566	    atomic_read(&work->pending) >= INTEL_FLIP_COMPLETE ||
1567	    !work->enable_stall_check) {
1568		/* Either the pending flip IRQ arrived, or we're too early. Don't check */
1569		spin_unlock_irqrestore(&dev->event_lock, flags);
1570		return;
1571	}
1572
1573	/* Potential stall - if we see that the flip has happened, assume a missed interrupt */
1574	obj = work->pending_flip_obj;
1575	if (INTEL_INFO(dev)->gen >= 4) {
1576		int dspsurf = DSPSURF(intel_crtc->plane);
1577		stall_detected = I915_HI_DISPBASE(I915_READ(dspsurf)) ==
1578					obj->gtt_offset;
1579	} else {
1580		int dspaddr = DSPADDR(intel_crtc->plane);
1581		stall_detected = I915_READ(dspaddr) == (obj->gtt_offset +
1582							crtc->y * crtc->fb->pitches[0] +
1583							crtc->x * crtc->fb->bits_per_pixel/8);
1584	}
1585
1586	spin_unlock_irqrestore(&dev->event_lock, flags);
1587
1588	if (stall_detected) {
1589		DRM_DEBUG_DRIVER("Pageflip stall detected\n");
1590		intel_prepare_page_flip(dev, intel_crtc->plane);
1591	}
1592}
1593
1594/* Called from drm generic code, passed 'crtc' which
1595 * we use as a pipe index
1596 */
1597static int i915_enable_vblank(struct drm_device *dev, int pipe)
1598{
1599	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1600	unsigned long irqflags;
1601
1602	if (!i915_pipe_enabled(dev, pipe))
1603		return -EINVAL;
1604
1605	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1606	if (INTEL_INFO(dev)->gen >= 4)
1607		i915_enable_pipestat(dev_priv, pipe,
1608				     PIPE_START_VBLANK_INTERRUPT_ENABLE);
1609	else
1610		i915_enable_pipestat(dev_priv, pipe,
1611				     PIPE_VBLANK_INTERRUPT_ENABLE);
1612
1613	/* maintain vblank delivery even in deep C-states */
1614	if (dev_priv->info->gen == 3)
1615		I915_WRITE(INSTPM, _MASKED_BIT_DISABLE(INSTPM_AGPBUSY_DIS));
1616	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1617
1618	return 0;
1619}
1620
1621static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
1622{
1623	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1624	unsigned long irqflags;
1625
1626	if (!i915_pipe_enabled(dev, pipe))
1627		return -EINVAL;
1628
1629	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1630	ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
1631				    DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
1632	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1633
1634	return 0;
1635}
1636
1637static int ivybridge_enable_vblank(struct drm_device *dev, int pipe)
1638{
1639	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1640	unsigned long irqflags;
1641
1642	if (!i915_pipe_enabled(dev, pipe))
1643		return -EINVAL;
1644
1645	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1646	ironlake_enable_display_irq(dev_priv,
1647				    DE_PIPEA_VBLANK_IVB << (5 * pipe));
1648	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1649
1650	return 0;
1651}
1652
1653static int valleyview_enable_vblank(struct drm_device *dev, int pipe)
1654{
1655	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1656	unsigned long irqflags;
1657	u32 imr;
1658
1659	if (!i915_pipe_enabled(dev, pipe))
1660		return -EINVAL;
1661
1662	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1663	imr = I915_READ(VLV_IMR);
1664	if (pipe == 0)
1665		imr &= ~I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
1666	else
1667		imr &= ~I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
1668	I915_WRITE(VLV_IMR, imr);
1669	i915_enable_pipestat(dev_priv, pipe,
1670			     PIPE_START_VBLANK_INTERRUPT_ENABLE);
1671	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1672
1673	return 0;
1674}
1675
1676/* Called from drm generic code, passed 'crtc' which
1677 * we use as a pipe index
1678 */
1679static void i915_disable_vblank(struct drm_device *dev, int pipe)
1680{
1681	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1682	unsigned long irqflags;
1683
1684	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1685	if (dev_priv->info->gen == 3)
1686		I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_DIS));
1687
1688	i915_disable_pipestat(dev_priv, pipe,
1689			      PIPE_VBLANK_INTERRUPT_ENABLE |
1690			      PIPE_START_VBLANK_INTERRUPT_ENABLE);
1691	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1692}
1693
1694static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
1695{
1696	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1697	unsigned long irqflags;
1698
1699	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1700	ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
1701				     DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
1702	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1703}
1704
1705static void ivybridge_disable_vblank(struct drm_device *dev, int pipe)
1706{
1707	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1708	unsigned long irqflags;
1709
1710	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1711	ironlake_disable_display_irq(dev_priv,
1712				     DE_PIPEA_VBLANK_IVB << (pipe * 5));
1713	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1714}
1715
1716static void valleyview_disable_vblank(struct drm_device *dev, int pipe)
1717{
1718	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1719	unsigned long irqflags;
1720	u32 imr;
1721
1722	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
1723	i915_disable_pipestat(dev_priv, pipe,
1724			      PIPE_START_VBLANK_INTERRUPT_ENABLE);
1725	imr = I915_READ(VLV_IMR);
1726	if (pipe == 0)
1727		imr |= I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
1728	else
1729		imr |= I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
1730	I915_WRITE(VLV_IMR, imr);
1731	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1732}
1733
1734static u32
1735ring_last_seqno(struct intel_ring_buffer *ring)
1736{
1737	return list_entry(ring->request_list.prev,
1738			  struct drm_i915_gem_request, list)->seqno;
1739}
1740
1741static bool i915_hangcheck_ring_idle(struct intel_ring_buffer *ring, bool *err)
1742{
1743	if (list_empty(&ring->request_list) ||
1744	    i915_seqno_passed(ring->get_seqno(ring, false),
1745			      ring_last_seqno(ring))) {
1746		/* Issue a wake-up to catch stuck h/w. */
1747		if (waitqueue_active(&ring->irq_queue)) {
1748			DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
1749				  ring->name);
1750			wake_up_all(&ring->irq_queue);
1751			*err = true;
1752		}
1753		return true;
1754	}
1755	return false;
1756}
1757
1758static bool kick_ring(struct intel_ring_buffer *ring)
1759{
1760	struct drm_device *dev = ring->dev;
1761	struct drm_i915_private *dev_priv = dev->dev_private;
1762	u32 tmp = I915_READ_CTL(ring);
1763	if (tmp & RING_WAIT) {
1764		DRM_ERROR("Kicking stuck wait on %s\n",
1765			  ring->name);
1766		I915_WRITE_CTL(ring, tmp);
1767		return true;
1768	}
1769	return false;
1770}
1771
1772static bool i915_hangcheck_hung(struct drm_device *dev)
1773{
1774	drm_i915_private_t *dev_priv = dev->dev_private;
1775
1776	if (dev_priv->gpu_error.hangcheck_count++ > 1) {
1777		bool hung = true;
1778
1779		DRM_ERROR("Hangcheck timer elapsed... GPU hung\n");
1780		i915_handle_error(dev, true);
1781
1782		if (!IS_GEN2(dev)) {
1783			struct intel_ring_buffer *ring;
1784			int i;
1785
1786			/* Is the chip hanging on a WAIT_FOR_EVENT?
1787			 * If so we can simply poke the RB_WAIT bit
1788			 * and break the hang. This should work on
1789			 * all but the second generation chipsets.
1790			 */
1791			for_each_ring(ring, dev_priv, i)
1792				hung &= !kick_ring(ring);
1793		}
1794
1795		return hung;
1796	}
1797
1798	return false;
1799}
1800
1801/**
1802 * This is called when the chip hasn't reported back with completed
1803 * batchbuffers in a long time. The first time this is called we simply record
1804 * ACTHD. If ACTHD hasn't changed by the time the hangcheck timer elapses
1805 * again, we assume the chip is wedged and try to fix it.
1806 */
1807void i915_hangcheck_elapsed(unsigned long data)
1808{
1809	struct drm_device *dev = (struct drm_device *)data;
1810	drm_i915_private_t *dev_priv = dev->dev_private;
1811	uint32_t acthd[I915_NUM_RINGS], instdone[I915_NUM_INSTDONE_REG];
1812	struct intel_ring_buffer *ring;
1813	bool err = false, idle;
1814	int…

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