Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> We have two paths that try to reset the forcewake registers back to
> known good values, with slightly different semantics and levels of
> paranoia. Combine the two by passing a parameter to either restore the
> forcewake status or to clear our bookkeeping, and raise the paranoia
> level to max.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_uncore.c | 81 +++++++++++++++++++------------------
> 1 file changed, 41 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index 361d1eae3cfd..e6bb421a3dbd 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -308,9 +308,17 @@ static void gen6_force_wake_timer(unsigned long arg)
> intel_runtime_pm_put(dev_priv);
> }
>
> -static void intel_uncore_forcewake_reset(struct drm_device *dev)
> +static void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> + unsigned long irqflags;
> +
> + del_timer_sync(&dev_priv->uncore.force_wake_timer);
> +
> + /* Hold uncore.lock across reset to prevent any register access
> + * with forcewake not set correctly
> + */
> + spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>
> if (IS_VALLEYVIEW(dev))
> vlv_force_wake_reset(dev_priv);
> @@ -319,6 +327,35 @@ static void intel_uncore_forcewake_reset(struct drm_device *dev)
>
> if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev) || IS_GEN8(dev))
> __gen7_gt_force_wake_mt_reset(dev_priv);
> +
> + if (restore) { /* If reset with a user forcewake, try to restore */
> + unsigned fw = 0;
> +
> + if (IS_VALLEYVIEW(dev)) {
> + if (dev_priv->uncore.fw_rendercount)
> + fw |= FORCEWAKE_RENDER;
> +
> + if (dev_priv->uncore.fw_mediacount)
> + fw |= FORCEWAKE_MEDIA;
> + } else {
> + if (dev_priv->uncore.forcewake_count)
> + fw = FORCEWAKE_ALL;
> + }
> +
> + if (fw)
> + dev_priv->uncore.funcs.force_wake_get(dev_priv, fw);
> +
> + if (IS_GEN6(dev) || IS_GEN7(dev))
> + dev_priv->uncore.fifo_count =
> + __raw_i915_read32(dev_priv, GTFIFOCTL) &
> + GT_FIFO_FREE_ENTRIES_MASK;
> + } else {
> + dev_priv->uncore.forcewake_count = 0;
> + dev_priv->uncore.fw_rendercount = 0;
> + dev_priv->uncore.fw_mediacount = 0;
> + }
> +
> + spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> }
>
> void intel_uncore_early_sanitize(struct drm_device *dev)
> @@ -344,7 +381,7 @@ void intel_uncore_early_sanitize(struct drm_device *dev)
> __raw_i915_write32(dev_priv, GTFIFODBG,
> __raw_i915_read32(dev_priv, GTFIFODBG));
>
> - intel_uncore_forcewake_reset(dev);
> + intel_uncore_forcewake_reset(dev, false);
> }
>
> void intel_uncore_sanitize(struct drm_device *dev)
> @@ -798,17 +835,9 @@ void intel_uncore_init(struct drm_device *dev)
>
> void intel_uncore_fini(struct drm_device *dev)
> {
> - struct drm_i915_private *dev_priv = dev->dev_private;
> -
> - del_timer_sync(&dev_priv->uncore.force_wake_timer);
> -
> /* Paranoia: make sure we have disabled everything before we exit. */
> intel_uncore_sanitize(dev);
> - intel_uncore_forcewake_reset(dev);
> -
> - dev_priv->uncore.forcewake_count = 0;
> - dev_priv->uncore.fw_rendercount = 0;
> - dev_priv->uncore.fw_mediacount = 0;
> + intel_uncore_forcewake_reset(dev, false);
> }
>
> static const struct register_whitelist {
> @@ -957,13 +986,6 @@ static int gen6_do_reset(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> int ret;
> - unsigned long irqflags;
> - u32 fw_engine = 0;
> -
> - /* Hold uncore.lock across reset to prevent any register access
> - * with forcewake not set correctly
> - */
> - spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>
> /* Reset the chip */
>
> @@ -976,29 +998,8 @@ static int gen6_do_reset(struct drm_device *dev)
> /* Spin waiting for the device to ack the reset request */
> ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
We used to go through the reset with uncore lock held,
which is not the case anymore. Will it create problems?
-Mika
> - intel_uncore_forcewake_reset(dev);
> -
> - /* If reset with a user forcewake, try to restore */
> - if (IS_VALLEYVIEW(dev)) {
> - if (dev_priv->uncore.fw_rendercount)
> - fw_engine |= FORCEWAKE_RENDER;
> -
> - if (dev_priv->uncore.fw_mediacount)
> - fw_engine |= FORCEWAKE_MEDIA;
> - } else {
> - if (dev_priv->uncore.forcewake_count)
> - fw_engine = FORCEWAKE_ALL;
> - }
> -
> - if (fw_engine)
> - dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_engine);
> + intel_uncore_forcewake_reset(dev, true);
>
> - if (IS_GEN6(dev) || IS_GEN7(dev))
> - dev_priv->uncore.fifo_count =
> - __raw_i915_read32(dev_priv, GTFIFOCTL) &
> - GT_FIFO_FREE_ENTRIES_MASK;
> -
> - spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> return ret;
> }
>
> --
> 1.9.0
>
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