/*
 * 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 = dev->dev_private;
        struct intel_crtc *crtc;
        enum pipe pipe;

        assert_spin_locked(&dev_priv->irq_lock);

        for_each_pipe(dev_priv, pipe) {
                crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);

                if (crtc->cpu_fifo_underrun_disabled)
                        return false;
        }

        return true;
}

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

        assert_spin_locked(&dev_priv->irq_lock);

        for_each_pipe(dev_priv, pipe) {
                crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);

                if (crtc->pch_fifo_underrun_disabled)
                        return false;
        }

        return true;
}

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));
}

static void i9xx_set_fifo_underrun_reporting(struct drm_device *dev,
                                             enum pipe pipe,
                                             bool enable, bool old)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        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));
        }
}

static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,
                                                 enum pipe pipe, bool enable)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        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);
}

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));
}

static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
                                                  enum pipe pipe,
                                                  bool enable, bool old)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        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));
                }
        }
}

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

        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);
}

static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
                                            enum transcoder pch_transcoder,
                                            bool enable)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        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);
}

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 %c\n",
                  transcoder_name(pch_transcoder));
}

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 = dev->dev_private;

        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 %c\n",
                                  transcoder_name(pch_transcoder));
                }
        }
}

static bool __intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
                                                    enum pipe pipe, bool enable)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        bool old;

        assert_spin_locked(&dev_priv->irq_lock);

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

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

        return old;
}

/**
 * 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->dev, pipe,
                                                      enable);
        spin_unlock_irqrestore(&dev_priv->irq_lock, flags);

        return ret;
}

/**
 * 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 drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        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 = !intel_crtc->pch_fifo_underrun_disabled;
        intel_crtc->pch_fifo_underrun_disabled = !enable;

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

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

/**
 * 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 drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[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->dev) &&
            to_intel_crtc(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_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 %c FIFO underrun\n",
                          transcoder_name(pch_transcoder));
}

/**
 * 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->dev, 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);
}

/**
 * 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->dev, 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);
}