[Intel-gfx] [PATCH] drm/i915: Restore current RPS state after reset

[Chris Wilson]

Following commit 821ed7df6e2a ("drm/i915: Update reset path to fix
incomplete requests") we no longer mark the context as lost on reset as
we keep the requests (and contexts) alive. However, RPS remains reset
and we need to restore the current state to match the in-flight
requests.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97824
Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 9 ---------
 drivers/gpu/drm/i915/i915_gem.c | 7 +++++++
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index af43c968fc5a..b2e67aaad531 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1792,15 +1792,6 @@ void i915_reset(struct drm_i915_private *dev_priv)
 		goto error;
 	}
 
-	/*
-	 * rps/rc6 re-init is necessary to restore state lost after the
-	 * reset and the re-install of gt irqs. Skip for ironlake per
-	 * previous concerns that it doesn't respond well to some forms
-	 * of re-init after reset.
-	 */
-	intel_sanitize_gt_powersave(dev_priv);
-	intel_autoenable_gt_powersave(dev_priv);
-
 wakeup:
 	wake_up_bit(&error->flags, I915_RESET_IN_PROGRESS);
 	return;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 769478a835e5..71efaf3d4215 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2688,6 +2688,13 @@ void i915_gem_reset(struct drm_i915_private *dev_priv)
 		i915_gem_reset_engine(engine);
 
 	i915_gem_restore_fences(&dev_priv->drm);
+
+	if (dev_priv->gt.awake) {
+		intel_sanitize_gt_powersave(dev_priv);
+		intel_enable_gt_powersave(dev_priv);
+		if (INTEL_GEN(dev_priv) >= 6)
+			gen6_rps_busy(dev_priv);
+	}
 }
 
 static void nop_submit_request(struct drm_i915_gem_request *request)
-- 
2.9.3