drm/i915: Expose retry count to per gen reset logic

There is a possibility for per gen reset logic to
be more nasty if the softer approach on resetting does
not bear fruit.

Expose retry count to per gen reset logic if it
wants to take such tough measures.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180810140036.24240-1-mika.kuoppala@linux.intel.com

drivers/gpu/drm/i915/intel_uncore.c

@@ -1739,7 +1739,7 @@ static void gen3_stop_engine(struct intel_engine_cs *engine)
 }
 
 static void i915_stop_engines(struct drm_i915_private *dev_priv,
-			      unsigned engine_mask)
+			      unsigned int engine_mask)
 {
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
@@ -1759,7 +1759,9 @@ static bool i915_in_reset(struct pci_dev *pdev)
 	return gdrst & GRDOM_RESET_STATUS;
 }
 
-static int i915_do_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
+static int i915_do_reset(struct drm_i915_private *dev_priv,
+			 unsigned int engine_mask,
+			 unsigned int retry)
 {
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 	int err;
@@ -1786,7 +1788,9 @@ static bool g4x_reset_complete(struct pci_dev *pdev)
 	return (gdrst & GRDOM_RESET_ENABLE) == 0;
 }
 
-static int g33_do_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
+static int g33_do_reset(struct drm_i915_private *dev_priv,
+			unsigned int engine_mask,
+			unsigned int retry)
 {
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 
@@ -1794,7 +1798,9 @@ static int g33_do_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 	return wait_for(g4x_reset_complete(pdev), 500);
 }
 
-static int g4x_do_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
+static int g4x_do_reset(struct drm_i915_private *dev_priv,
+			unsigned int engine_mask,
+			unsigned int retry)
 {
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 	int ret;
@@ -1831,7 +1837,8 @@ static int g4x_do_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 }
 
 static int ironlake_do_reset(struct drm_i915_private *dev_priv,
-			     unsigned engine_mask)
+			     unsigned int engine_mask,
+			     unsigned int retry)
 {
 	int ret;
 
@@ -1887,6 +1894,7 @@ static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
  * gen6_reset_engines - reset individual engines
  * @dev_priv: i915 device
  * @engine_mask: mask of intel_ring_flag() engines or ALL_ENGINES for full reset
+ * @retry: the count of of previous attempts to reset.
  *
  * This function will reset the individual engines that are set in engine_mask.
  * If you provide ALL_ENGINES as mask, full global domain reset will be issued.
@@ -1897,7 +1905,8 @@ static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
  * Returns 0 on success, nonzero on error.
  */
 static int gen6_reset_engines(struct drm_i915_private *dev_priv,
-			      unsigned engine_mask)
+			      unsigned int engine_mask,
+			      unsigned int retry)
 {
 	struct intel_engine_cs *engine;
 	const u32 hw_engine_mask[I915_NUM_ENGINES] = {
@@ -1936,7 +1945,7 @@ static int gen6_reset_engines(struct drm_i915_private *dev_priv,
  * Returns 0 on success, nonzero on error.
  */
 static int gen11_reset_engines(struct drm_i915_private *dev_priv,
-			       unsigned engine_mask)
+			       unsigned int engine_mask)
 {
 	struct intel_engine_cs *engine;
 	const u32 hw_engine_mask[I915_NUM_ENGINES] = {
@@ -2105,7 +2114,8 @@ static void gen8_reset_engine_cancel(struct intel_engine_cs *engine)
 }
 
 static int gen8_reset_engines(struct drm_i915_private *dev_priv,
-			      unsigned engine_mask)
+			      unsigned int engine_mask,
+			      unsigned int retry)
 {
 	struct intel_engine_cs *engine;
 	unsigned int tmp;
@@ -2121,7 +2131,7 @@ static int gen8_reset_engines(struct drm_i915_private *dev_priv,
 	if (INTEL_GEN(dev_priv) >= 11)
 		ret = gen11_reset_engines(dev_priv, engine_mask);
 	else
-		ret = gen6_reset_engines(dev_priv, engine_mask);
+		ret = gen6_reset_engines(dev_priv, engine_mask, retry);
 
 not_ready:
 	for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
@@ -2130,7 +2140,8 @@ static int gen8_reset_engines(struct drm_i915_private *dev_priv,
 	return ret;
 }
 
-typedef int (*reset_func)(struct drm_i915_private *, unsigned engine_mask);
+typedef int (*reset_func)(struct drm_i915_private *,
+			  unsigned int engine_mask, unsigned int retry);
 
 static reset_func intel_get_gpu_reset(struct drm_i915_private *dev_priv)
 {
@@ -2153,10 +2164,10 @@ static reset_func intel_get_gpu_reset(struct drm_i915_private *dev_priv)
 		return NULL;
 }
 
-int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
+int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned int engine_mask)
 {
 	reset_func reset = intel_get_gpu_reset(dev_priv);
-	int retry;
+	unsigned int retry;
 	int ret;
 
 	/*
@@ -2200,8 +2211,9 @@ int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 
 		ret = -ENODEV;
 		if (reset) {
-			GEM_TRACE("engine_mask=%x\n", engine_mask);
-			ret = reset(dev_priv, engine_mask);
+			ret = reset(dev_priv, engine_mask, retry);
+			GEM_TRACE("engine_mask=%x, ret=%d, retry=%d\n",
+				  engine_mask, ret, retry);
 		}
 		if (ret != -ETIMEDOUT || engine_mask != ALL_ENGINES)
 			break;