Release 4.11 drivers/gpu/drm/i915/intel_fifo_underrun.c

/*
 * Copyright © 2014 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Daniel Vetter <daniel.vetter@ffwll.ch>
 *
 */

#include "i915_drv.h"
#include "intel_drv.h"

/**
 * DOC: fifo underrun handling
 *
 * The i915 driver checks for display fifo underruns using the interrupt signals
 * provided by the hardware. This is enabled by default and fairly useful to
 * debug display issues, especially watermark settings.
 *
 * If an underrun is detected this is logged into dmesg. To avoid flooding logs
 * and occupying the cpu underrun interrupts are disabled after the first
 * occurrence until the next modeset on a given pipe.
 *
 * Note that underrun detection on gmch platforms is a bit more ugly since there
 * is no interrupt (despite that the signalling bit is in the PIPESTAT pipe
 * interrupt register). Also on some other platforms underrun interrupts are
 * shared, which means that if we detect an underrun we need to disable underrun
 * reporting on all pipes.
 *
 * The code also supports underrun detection on the PCH transcoder.
 */



static bool ivb_can_enable_err_int(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	struct intel_crtc *crtc;
	enum pipe pipe;

	assert_spin_locked(&dev_priv->irq_lock);

	for_each_pipe(dev_priv, pipe) {
		crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

		if (crtc->cpu_fifo_underrun_disabled)
			return false;
	}

	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
60
89.55%
1
33.33%
Ville Syrjälä
4
5.97%
1
33.33%
Chris Wilson
3
4.48%
1
33.33%
Total
67
100.00%
3
100.00%



static bool cpt_can_enable_serr_int(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	enum pipe pipe;
	struct intel_crtc *crtc;

	assert_spin_locked(&dev_priv->irq_lock);

	for_each_pipe(dev_priv, pipe) {
		crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

		if (crtc->pch_fifo_underrun_disabled)
			return false;
	}

	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
60
89.55%
1
33.33%
Ville Syrjälä
4
5.97%
1
33.33%
Chris Wilson
3
4.48%
1
33.33%
Total
67
100.00%
3
100.00%



static void i9xx_check_fifo_underruns(struct intel_crtc *crtc)
{
	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
	i915_reg_t reg = PIPESTAT(crtc->pipe);
	u32 pipestat = I915_READ(reg) & 0xffff0000;

	assert_spin_locked(&dev_priv->irq_lock);

	if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0)
		return;

	I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
	POSTING_READ(reg);

	DRM_ERROR("pipe %c underrun\n", pipe_name(crtc->pipe));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
67
74.44%
2
50.00%
Ville Syrjälä
23
25.56%
2
50.00%
Total
90
100.00%
4
100.00%



static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev,
					     enum pipe pipe,
					     bool enable, bool old)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	i915_reg_t reg = PIPESTAT(pipe);
	u32 pipestat = I915_READ(reg) & 0xffff0000;

	assert_spin_locked(&dev_priv->irq_lock);

	if (enable) {
		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
		POSTING_READ(reg);
	} else {
		if (old && pipestat & PIPE_FIFO_UNDERRUN_STATUS)
			DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
94
95.92%
1
33.33%
Chris Wilson
3
3.06%
1
33.33%
Ville Syrjälä
1
1.02%
1
33.33%
Total
98
100.00%
3
100.00%



static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,
						 enum pipe pipe, bool enable)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :
					  DE_PIPEB_FIFO_UNDERRUN;

	if (enable)
		ilk_enable_display_irq(dev_priv, bit);
	else
		ilk_disable_display_irq(dev_priv, bit);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
55
91.67%
1
33.33%
Chris Wilson
3
5.00%
1
33.33%
Ville Syrjälä
2
3.33%
1
33.33%
Total
60
100.00%
3
100.00%



static void ivybridge_check_fifo_underruns(struct intel_crtc *crtc)
{
	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
	enum pipe pipe = crtc->pipe;
	uint32_t err_int = I915_READ(GEN7_ERR_INT);

	assert_spin_locked(&dev_priv->irq_lock);

	if ((err_int & ERR_INT_FIFO_UNDERRUN(pipe)) == 0)
		return;

	I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));
	POSTING_READ(GEN7_ERR_INT);

	DRM_ERROR("fifo underrun on pipe %c\n", pipe_name(pipe));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ville Syrjälä
88
100.00%
1
100.00%
Total
88
100.00%
1
100.00%



static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
						  enum pipe pipe,
						  bool enable, bool old)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	if (enable) {
		I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN(pipe));

		if (!ivb_can_enable_err_int(dev))
			return;

		ilk_enable_display_irq(dev_priv, DE_ERR_INT_IVB);
	} else {
		ilk_disable_display_irq(dev_priv, DE_ERR_INT_IVB);

		if (old &&
		    I915_READ(GEN7_ERR_INT) & ERR_INT_FIFO_UNDERRUN(pipe)) {
			DRM_ERROR("uncleared fifo underrun on pipe %c\n",
				  pipe_name(pipe));
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
94
94.95%
1
33.33%
Chris Wilson
3
3.03%
1
33.33%
Ville Syrjälä
2
2.02%
1
33.33%
Total
99
100.00%
3
100.00%



static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,
						  enum pipe pipe, bool enable)
{
	struct drm_i915_private *dev_priv = to_i915(dev);

	if (enable)
		bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
	else
		bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_FIFO_UNDERRUN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
39
76.47%
1
33.33%
Ville Syrjälä
9
17.65%
1
33.33%
Chris Wilson
3
5.88%
1
33.33%
Total
51
100.00%
3
100.00%



static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
					    enum transcoder pch_transcoder,
					    bool enable)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	uint32_t bit = (pch_transcoder == TRANSCODER_A) ?
		       SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;

	if (enable)
		ibx_enable_display_interrupt(dev_priv, bit);
	else
		ibx_disable_display_interrupt(dev_priv, bit);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
57
95.00%
1
50.00%
Chris Wilson
3
5.00%
1
50.00%
Total
60
100.00%
2
100.00%



static void cpt_check_pch_fifo_underruns(struct intel_crtc *crtc)
{
	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
	enum transcoder pch_transcoder = (enum transcoder) crtc->pipe;
	uint32_t serr_int = I915_READ(SERR_INT);

	assert_spin_locked(&dev_priv->irq_lock);

	if ((serr_int & SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) == 0)
		return;

	I915_WRITE(SERR_INT, SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));
	POSTING_READ(SERR_INT);

	DRM_ERROR("pch fifo underrun on pch transcoder %s\n",
		  transcoder_name(pch_transcoder));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ville Syrjälä
91
98.91%
1
50.00%
Jani Nikula
1
1.09%
1
50.00%
Total
92
100.00%
2
100.00%



static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
					    enum transcoder pch_transcoder,
					    bool enable, bool old)
{
	struct drm_i915_private *dev_priv = to_i915(dev);

	if (enable) {
		I915_WRITE(SERR_INT,
			   SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));

		if (!cpt_can_enable_serr_int(dev))
			return;

		ibx_enable_display_interrupt(dev_priv, SDE_ERROR_CPT);
	} else {
		ibx_disable_display_interrupt(dev_priv, SDE_ERROR_CPT);

		if (old && I915_READ(SERR_INT) &
		    SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) {
			DRM_ERROR("uncleared pch fifo underrun on pch transcoder %s\n",
				  transcoder_name(pch_transcoder));
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
95
95.96%
1
33.33%
Chris Wilson
3
3.03%
1
33.33%
Jani Nikula
1
1.01%
1
33.33%
Total
99
100.00%
3
100.00%



static bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
						    enum pipe pipe, bool enable)
{
	struct drm_i915_private *dev_priv = to_i915(dev);
	struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
	bool old;

	assert_spin_locked(&dev_priv->irq_lock);

	old = !crtc->cpu_fifo_underrun_disabled;
	crtc->cpu_fifo_underrun_disabled = !enable;

	if (HAS_GMCH_DISPLAY(dev_priv))
		i9xx_set_fifo_underrun_reporting(dev, pipe, enable, old);
	else if (IS_GEN5(dev_priv) || IS_GEN6(dev_priv))
		ironlake_set_fifo_underrun_reporting(dev, pipe, enable);
	else if (IS_GEN7(dev_priv))
		ivybridge_set_fifo_underrun_reporting(dev, pipe, enable, old);
	else if (IS_GEN8(dev_priv) || IS_GEN9(dev_priv))
		broadwell_set_fifo_underrun_reporting(dev, pipe, enable);

	return old;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
133
89.26%
1
16.67%
Ville Syrjälä
7
4.70%
2
33.33%
Tvrtko A. Ursulin
6
4.03%
2
33.33%
Chris Wilson
3
2.01%
1
16.67%
Total
149
100.00%
6
100.00%

/**
 * intel_set_cpu_fifo_underrun_reporting - set cpu fifo underrrun reporting state
 * @dev_priv: i915 device instance
 * @pipe: (CPU) pipe to set state for
 * @enable: whether underruns should be reported or not
 *
 * This function sets the fifo underrun state for @pipe. It is used in the
 * modeset code to avoid false positives since on many platforms underruns are
 * expected when disabling or enabling the pipe.
 *
 * Notice that on some platforms disabling underrun reports for one pipe
 * disables for all due to shared interrupts. Actual reporting is still per-pipe
 * though.
 *
 * Returns the previous state of underrun reporting.
 */


bool intel_set_cpu_fifo_underrun_reporting(struct drm_i915_private *dev_priv,
					   enum pipe pipe, bool enable)
{
	unsigned long flags;
	bool ret;

	spin_lock_irqsave(&dev_priv->irq_lock, flags);
	ret = __intel_set_cpu_fifo_underrun_reporting(&dev_priv->drm, pipe,
						      enable);
	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
59
96.72%
2
66.67%
Chris Wilson
2
3.28%
1
33.33%
Total
61
100.00%
3
100.00%

/**
 * intel_set_pch_fifo_underrun_reporting - set PCH fifo underrun reporting state
 * @dev_priv: i915 device instance
 * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)
 * @enable: whether underruns should be reported or not
 *
 * This function makes us disable or enable PCH fifo underruns for a specific
 * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO
 * underrun reporting for one transcoder may also disable all the other PCH
 * error interruts for the other transcoders, due to the fact that there's just
 * one interrupt mask/enable bit for all the transcoders.
 *
 * Returns the previous state of underrun reporting.
 */


bool intel_set_pch_fifo_underrun_reporting(struct drm_i915_private *dev_priv,
					   enum transcoder pch_transcoder,
					   bool enable)
{
	struct intel_crtc *crtc =
		intel_get_crtc_for_pipe(dev_priv, (enum pipe) pch_transcoder);
	unsigned long flags;
	bool old;

	/*
         * NOTE: Pre-LPT has a fixed cpu pipe -> pch transcoder mapping, but LPT
         * has only one pch transcoder A that all pipes can use. To avoid racy
         * pch transcoder -> pipe lookups from interrupt code simply store the
         * underrun statistics in crtc A. Since we never expose this anywhere
         * nor use it outside of the fifo underrun code here using the "wrong"
         * crtc on LPT won't cause issues.
         */

	spin_lock_irqsave(&dev_priv->irq_lock, flags);

	old = !crtc->pch_fifo_underrun_disabled;
	crtc->pch_fifo_underrun_disabled = !enable;

	if (HAS_PCH_IBX(dev_priv))
		ibx_set_fifo_underrun_reporting(&dev_priv->drm,
						pch_transcoder,
						enable);
	else
		cpt_set_fifo_underrun_reporting(&dev_priv->drm,
						pch_transcoder,
						enable, old);

	spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
	return old;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
97
86.61%
2
40.00%
Ville Syrjälä
11
9.82%
2
40.00%
Chris Wilson
4
3.57%
1
20.00%
Total
112
100.00%
5
100.00%

/**
 * intel_cpu_fifo_underrun_irq_handler - handle CPU fifo underrun interrupt
 * @dev_priv: i915 device instance
 * @pipe: (CPU) pipe to set state for
 *
 * This handles a CPU fifo underrun interrupt, generating an underrun warning
 * into dmesg if underrun reporting is enabled and then disables the underrun
 * interrupt to avoid an irq storm.
 */


void intel_cpu_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv,
					 enum pipe pipe)
{
	struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);

	/* We may be called too early in init, thanks BIOS! */
	if (crtc == NULL)
		return;

	/* GMCH can't disable fifo underruns, filter them. */
	if (HAS_GMCH_DISPLAY(dev_priv) &&
	    crtc->cpu_fifo_underrun_disabled)
		return;

	if (intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false))
		DRM_ERROR("CPU pipe %c FIFO underrun\n",
			  pipe_name(pipe));

	intel_fbc_handle_fifo_underrun_irq(dev_priv);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
45
61.64%
2
33.33%
Chris Wilson
18
24.66%
1
16.67%
Ville Syrjälä
5
6.85%
2
33.33%
Paulo Zanoni
5
6.85%
1
16.67%
Total
73
100.00%
6
100.00%

/**
 * intel_pch_fifo_underrun_irq_handler - handle PCH fifo underrun interrupt
 * @dev_priv: i915 device instance
 * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)
 *
 * This handles a PCH fifo underrun interrupt, generating an underrun warning
 * into dmesg if underrun reporting is enabled and then disables the underrun
 * interrupt to avoid an irq storm.
 */


void intel_pch_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv,
					 enum transcoder pch_transcoder)
{
	if (intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder,
						  false))
		DRM_ERROR("PCH transcoder %s FIFO underrun\n",
			  transcoder_name(pch_transcoder));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
34
97.14%
1
50.00%
Jani Nikula
1
2.86%
1
50.00%
Total
35
100.00%
2
100.00%

/**
 * intel_check_cpu_fifo_underruns - check for CPU fifo underruns immediately
 * @dev_priv: i915 device instance
 *
 * Check for CPU fifo underruns immediately. Useful on IVB/HSW where the shared
 * error interrupt may have been disabled, and so CPU fifo underruns won't
 * necessarily raise an interrupt, and on GMCH platforms where underruns never
 * raise an interrupt.
 */


void intel_check_cpu_fifo_underruns(struct drm_i915_private *dev_priv)
{
	struct intel_crtc *crtc;

	spin_lock_irq(&dev_priv->irq_lock);

	for_each_intel_crtc(&dev_priv->drm, crtc) {
		if (crtc->cpu_fifo_underrun_disabled)
			continue;

		if (HAS_GMCH_DISPLAY(dev_priv))
			i9xx_check_fifo_underruns(crtc);
		else if (IS_GEN7(dev_priv))
			ivybridge_check_fifo_underruns(crtc);
	}

	spin_unlock_irq(&dev_priv->irq_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ville Syrjälä
70
98.59%
1
50.00%
Chris Wilson
1
1.41%
1
50.00%
Total
71
100.00%
2
100.00%

/**
 * intel_check_pch_fifo_underruns - check for PCH fifo underruns immediately
 * @dev_priv: i915 device instance
 *
 * Check for PCH fifo underruns immediately. Useful on CPT/PPT where the shared
 * error interrupt may have been disabled, and so PCH fifo underruns won't
 * necessarily raise an interrupt.
 */


void intel_check_pch_fifo_underruns(struct drm_i915_private *dev_priv)
{
	struct intel_crtc *crtc;

	spin_lock_irq(&dev_priv->irq_lock);

	for_each_intel_crtc(&dev_priv->drm, crtc) {
		if (crtc->pch_fifo_underrun_disabled)
			continue;

		if (HAS_PCH_CPT(dev_priv))
			cpt_check_pch_fifo_underruns(crtc);
	}

	spin_unlock_irq(&dev_priv->irq_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ville Syrjälä
57
98.28%
1
50.00%
Chris Wilson
1
1.72%
1
50.00%
Total
58
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Daniel Vetter
1000
69.25%
5
26.32%
Ville Syrjälä
376
26.04%
6
31.58%
Chris Wilson
53
3.67%
3
15.79%
Tvrtko A. Ursulin
6
0.42%
2
10.53%
Paulo Zanoni
5
0.35%
1
5.26%
Jani Nikula
3
0.21%
1
5.26%
Kumar Amit Mehta
1
0.07%
1
5.26%
Total
1444
100.00%
19
100.00%
Directory: drivers/gpu/drm/i915

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.