drm/i915/guc: Add a helper for log buffer size

Add a helper to get GuC log buffer size.
Signed-off-by: NAlan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: NJohn Harrison <John.C.Harrison@Intel.com>
Reviewed-by: NMatthew Brost <matthew.brost@intel.com>
Reviewed-by: NAlan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220728022028.2190627-2-John.C.Harrison@Intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_log.c

@@ -15,6 +15,32 @@
 
 static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log);
 
+static u32 intel_guc_log_size(struct intel_guc_log *log)
+{
+	/*
+	 *  GuC Log buffer Layout:
+	 *
+	 *  NB: Ordering must follow "enum guc_log_buffer_type".
+	 *
+	 *  +===============================+ 00B
+	 *  |      Debug state header       |
+	 *  +-------------------------------+ 32B
+	 *  |    Crash dump state header    |
+	 *  +-------------------------------+ 64B
+	 *  |     Capture state header      |
+	 *  +-------------------------------+ 96B
+	 *  |                               |
+	 *  +===============================+ PAGE_SIZE (4KB)
+	 *  |          Debug logs           |
+	 *  +===============================+ + DEBUG_SIZE
+	 *  |        Crash Dump logs        |
+	 *  +===============================+ + CRASH_SIZE
+	 *  |         Capture logs          |
+	 *  +===============================+ + CAPTURE_SIZE
+	 */
+	return PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE + CAPTURE_BUFFER_SIZE;
+}
+
 /**
  * DOC: GuC firmware log
  *
@@ -461,32 +487,11 @@ int intel_guc_log_create(struct intel_guc_log *log)
 
 	GEM_BUG_ON(log->vma);
 
-	/*
-	 *  GuC Log buffer Layout
-	 * (this ordering must follow "enum guc_log_buffer_type" definition)
-	 *
-	 *  +===============================+ 00B
-	 *  |      Debug state header       |
-	 *  +-------------------------------+ 32B
-	 *  |    Crash dump state header    |
-	 *  +-------------------------------+ 64B
-	 *  |     Capture state header      |
-	 *  +-------------------------------+ 96B
-	 *  |                               |
-	 *  +===============================+ PAGE_SIZE (4KB)
-	 *  |          Debug logs           |
-	 *  +===============================+ + DEBUG_SIZE
-	 *  |        Crash Dump logs        |
-	 *  +===============================+ + CRASH_SIZE
-	 *  |         Capture logs          |
-	 *  +===============================+ + CAPTURE_SIZE
-	 */
 	if (intel_guc_capture_output_min_size_est(guc) > CAPTURE_BUFFER_SIZE)
 		DRM_WARN("GuC log buffer for state_capture maybe too small. %d < %d\n",
 			 CAPTURE_BUFFER_SIZE, intel_guc_capture_output_min_size_est(guc));
 
-	guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE +
-		       CAPTURE_BUFFER_SIZE;
+	guc_log_size = intel_guc_log_size(log);
 
 	vma = intel_guc_allocate_vma(guc, guc_log_size);
 	if (IS_ERR(vma)) {