drm/i915: Reset only affected engines when handling error capture

Pass down the engine mask to i915_clear_error_registers so only affected
engines can be reset on the Gen6/7 path.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190607082557.31670-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/gt/intel_reset.c

@@ -1160,7 +1160,8 @@ static void clear_register(struct intel_uncore *uncore, i915_reg_t reg)
 	intel_uncore_rmw(uncore, reg, 0, 0);
 }
 
-void i915_clear_error_registers(struct drm_i915_private *i915)
+void i915_clear_error_registers(struct drm_i915_private *i915,
+				intel_engine_mask_t engine_mask)
 {
 	struct intel_uncore *uncore = &i915->uncore;
 	u32 eir;
@@ -1193,7 +1194,7 @@ void i915_clear_error_registers(struct drm_i915_private *i915)
 		struct intel_engine_cs *engine;
 		enum intel_engine_id id;
 
-		for_each_engine(engine, i915, id) {
+		for_each_engine_masked(engine, i915, engine_mask, id) {
 			rmw_clear(uncore,
 				  RING_FAULT_REG(engine), RING_FAULT_VALID);
 			intel_uncore_posting_read(uncore,
@@ -1250,7 +1251,7 @@ void i915_handle_error(struct drm_i915_private *i915,
 
 	if (flags & I915_ERROR_CAPTURE) {
 		i915_capture_error_state(i915, engine_mask, msg);
-		i915_clear_error_registers(i915);
+		i915_clear_error_registers(i915, engine_mask);
 	}
 
 	/*

drivers/gpu/drm/i915/gt/intel_reset.h

@@ -25,7 +25,8 @@ void i915_handle_error(struct drm_i915_private *i915,
 		       const char *fmt, ...);
 #define I915_ERROR_CAPTURE BIT(0)
 
-void i915_clear_error_registers(struct drm_i915_private *i915);
+void i915_clear_error_registers(struct drm_i915_private *i915,
+				intel_engine_mask_t engine_mask);
 
 void i915_reset(struct drm_i915_private *i915,
 		intel_engine_mask_t stalled_mask,

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -2359,7 +2359,7 @@ void i915_check_and_clear_faults(struct drm_i915_private *dev_priv)
 	else
 		return;
 
-	i915_clear_error_registers(dev_priv);
+	i915_clear_error_registers(dev_priv, ALL_ENGINES);
 }
 
 void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv)