drm/i915/guc: Refactoring preparation of the GUC_CTL_LOG_PARAMS parameter

At the moment, the preparation of GUC_CTL_LOG_PARAMS is disordered.
Additionally, in struct intel_guc_log we have an unnecessary field
'flags' which we use only to assign value to GuC parameter.
Lets move all GUC_CTL_LOG_PARAMS related operations to one place,
and lets remove field 'flags' from struct intel_guc_log.
Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180604141947.8299-4-piotr.piorkowski@intel.com

drivers/gpu/drm/i915/intel_guc.c

@@ -240,6 +240,22 @@ static u32 guc_ctl_feature_flags(struct intel_guc *guc)
 
 	return flags;
 }
+
+static u32 guc_ctl_log_params_flags(struct intel_guc *guc)
+{
+	u32 offset = intel_guc_ggtt_offset(guc, guc->log.vma) >> PAGE_SHIFT;
+	u32 flags;
+
+	/* each allocated unit is a page */
+	flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
+		(GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT) |
+		(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
+		(GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) |
+		(offset << GUC_LOG_BUF_ADDR_SHIFT);
+
+	return flags;
+}
+
 /*
  * Initialise the GuC parameter block before starting the firmware
  * transfer. These parameters are read by the firmware on startup
@@ -264,8 +280,7 @@ void intel_guc_init_params(struct intel_guc *guc)
 	params[GUC_CTL_WA] |= GUC_CTL_WA_UK_BY_DRIVER;
 
 	params[GUC_CTL_FEATURE] = guc_ctl_feature_flags(guc);
-	params[GUC_CTL_LOG_PARAMS] = guc->log.flags;
-
+	params[GUC_CTL_LOG_PARAMS]  = guc_ctl_log_params_flags(guc);
 	params[GUC_CTL_DEBUG] = guc_ctl_debug_flags(guc);
 
 	/* If GuC submission is enabled, set up additional parameters here */

drivers/gpu/drm/i915/intel_guc_log.c

@@ -452,8 +452,6 @@ int intel_guc_log_create(struct intel_guc_log *log)
 {
 	struct intel_guc *guc = log_to_guc(log);
 	struct i915_vma *vma;
-	unsigned long offset;
-	u32 flags;
 	int ret;
 
 	GEM_BUG_ON(log->vma);
@@ -466,15 +464,6 @@ int intel_guc_log_create(struct intel_guc_log *log)
 
 	log->vma = vma;
 
-	/* each allocated unit is a page */
-	flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
-		(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
-		(GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) |
-		(GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT);
-
-	offset = intel_guc_ggtt_offset(guc, vma) >> PAGE_SHIFT;
-	log->flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
-
 	log->level = i915_modparams.guc_log_level;
 
 	return 0;

drivers/gpu/drm/i915/intel_guc_log.h

@@ -60,7 +60,6 @@ struct intel_guc;
 
 struct intel_guc_log {
 	u32 level;
-	u32 flags;
 	struct i915_vma *vma;
 	struct {
 		void *buf_addr;