drm/i915: Handle error-state modparams in dedicated functions

Capturing and cleanup and modparams in error state requires
some macro tricks. Move that code into separated functions
for easier maintenance.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171026173657.49648-3-michal.wajdeczko@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -862,6 +862,13 @@ static __always_inline void free_param(const char *type, void *x)
 		kfree(*(void **)x);
 }
 
+static void cleanup_params(struct i915_gpu_state *error)
+{
+#define FREE(T, x, ...) free_param(#T, &error->params.x);
+	I915_PARAMS_FOR_EACH(FREE);
+#undef FREE
+}
+
 static void cleanup_uc_state(struct i915_gpu_state *error)
 {
 	struct i915_error_uc *error_uc = &error->uc;
@@ -905,10 +912,7 @@ void __i915_gpu_state_free(struct kref *error_ref)
 	kfree(error->overlay);
 	kfree(error->display);
 
-#define FREE(T, x, ...) free_param(#T, &error->params.x);
-	I915_PARAMS_FOR_EACH(FREE);
-#undef FREE
-
+	cleanup_params(error);
 	cleanup_uc_state(error);
 
 	kfree(error);
@@ -1746,6 +1750,14 @@ static __always_inline void dup_param(const char *type, void *x)
 		*(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
 }
 
+static void capture_params(struct i915_gpu_state *error)
+{
+	error->params = i915_modparams;
+#define DUP(T, x, ...) dup_param(#T, &error->params.x);
+	I915_PARAMS_FOR_EACH(DUP);
+#undef DUP
+}
+
 static int capture(void *data)
 {
 	struct i915_gpu_state *error = data;
@@ -1756,11 +1768,7 @@ static int capture(void *data)
 		ktime_to_timeval(ktime_sub(ktime_get(),
 					   error->i915->gt.last_init_time));
 
-	error->params = i915_modparams;
-#define DUP(T, x, ...) dup_param(#T, &error->params.x);
-	I915_PARAMS_FOR_EACH(DUP);
-#undef DUP
-
+	capture_params(error);
 	capture_uc_state(error);
 
 	i915_capture_gen_state(error->i915, error);