drm/i915: Add pretty printer for device info flags

We dump device flags in few places (init_early, debugfs, gpu_error)
using different functions. Lets add reusable function to avoid
code duplication.

add/remove: 1/0 grow/shrink: 0/3 up/down: 1296/-3572 (-2276)
Function                                     old     new   delta
intel_device_info_dump_flags                   -    1296   +1296
i915_capabilities                           2435    1353   -1082
i915_error_state_to_str                     6642    5507   -1135
intel_device_info_dump                      1507     152   -1355
Total: Before=1287992, After=1285716, chg -0.18%

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219114346.26308-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -58,14 +58,13 @@ static int i915_capabilities(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
 	const struct intel_device_info *info = INTEL_INFO(dev_priv);
+	struct drm_printer p = drm_seq_file_printer(m);
 
 	seq_printf(m, "gen: %d\n", INTEL_GEN(dev_priv));
 	seq_printf(m, "platform: %s\n", intel_platform_name(info->platform));
 	seq_printf(m, "pch: %d\n", INTEL_PCH_TYPE(dev_priv));
 
-#define PRINT_FLAG(x)  seq_printf(m, #x ": %s\n", yesno(info->x))
-	DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
-#undef PRINT_FLAG
+	intel_device_info_dump_flags(info, &p);
 
 	kernel_param_lock(THIS_MODULE);
 #define PRINT_PARAM(T, x, ...) seq_print_param(m, #x, #T, &i915_modparams.x);

drivers/gpu/drm/i915/i915_drv.h

@@ -4165,6 +4165,8 @@ mkwrite_device_info(struct drm_i915_private *dev_priv)
 const char *intel_platform_name(enum intel_platform platform);
 void intel_device_info_runtime_init(struct drm_i915_private *dev_priv);
 void intel_device_info_dump(struct drm_i915_private *dev_priv);
+void intel_device_info_dump_flags(const struct intel_device_info *info,
+				  struct drm_printer *p);
 
 /* modesetting */
 extern void intel_modeset_init_hw(struct drm_device *dev);

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -564,9 +564,9 @@ static void print_error_obj(struct drm_i915_error_state_buf *m,
 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 				   const struct intel_device_info *info)
 {
-#define PRINT_FLAG(x)  err_printf(m, #x ": %s\n", yesno(info->x))
-	DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
-#undef PRINT_FLAG
+	struct drm_printer p = i915_error_printer(m);
+
+	intel_device_info_dump_flags(info, &p);
 }
 
 static __always_inline void err_print_param(struct drm_i915_error_state_buf *m,

drivers/gpu/drm/i915/intel_device_info.c

@@ -22,6 +22,8 @@
  *
  */
 
+#include <drm/drm_print.h>
+
 #include "i915_drv.h"
 
 #define PLATFORM_NAME(x) [INTEL_##x] = #x
@@ -67,6 +69,14 @@ const char *intel_platform_name(enum intel_platform platform)
 	return platform_names[platform];
 }
 
+void intel_device_info_dump_flags(const struct intel_device_info *info,
+				  struct drm_printer *p)
+{
+#define PRINT_FLAG(name) drm_printf(p, "%s: %s\n", #name, yesno(info->name));
+	DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
+#undef PRINT_FLAG
+}
+
 void intel_device_info_dump(struct drm_i915_private *dev_priv)
 {
 	const struct intel_device_info *info = &dev_priv->info;
@@ -76,10 +86,12 @@ void intel_device_info_dump(struct drm_i915_private *dev_priv)
 			 info->gen,
 			 dev_priv->drm.pdev->device,
 			 dev_priv->drm.pdev->revision);
-#define PRINT_FLAG(name) \
-	DRM_DEBUG_DRIVER("i915 device info: " #name ": %s", yesno(info->name))
-	DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
-#undef PRINT_FLAG
+
+	if (drm_debug & DRM_UT_DRIVER) {
+		struct drm_printer p = drm_debug_printer("i915 device info: ");
+
+		intel_device_info_dump_flags(info, &p);
+	}
 }
 
 static void gen10_sseu_info_init(struct drm_i915_private *dev_priv)