[PATCH 05/10] drm/i915/guc: Enable default/critical logging in GuC by default from GuC v9

[Sagar Arun Kamble]

From: "Kamble, Sagar A" <sagar.a.kamble at intel.com>

With GuC v9, new type of Default/critical logging in GuC to enable
capturing minimal important logs in production systems efficiently.
This patch enables this logging in GuC by default always. It should
be noted that streaming support with half-full interrupt mechanism
that is present for normal logging is not present for this type of
logging.

v2: Emulating GuC critical logging through i915.guc_log_level. Setting
this to 0 will make GuC critical logging ON and setting it to 1-4 will
communicate log level of 0-3 to GuC.

v3: Commit message update. Enable default/critical logging in GuC always.
Fixed RPM wake during guc_log_unregister in the unload path.

v4: Moved RPM wake change to separate patch. Removed GUC_DEBUG_RESERVED
and updated name of new bit to be version agnostic. Updated parameter to
struct intel_guc * and name of macro NEEDS_GUC_CRITICAL_LOGGING.
Removed explicit clearing of GUC_CRITICAL_LOGGING_DISABLED from
params[GUC_CTL_DEBUG] as it is unnecessary. (

Cc: Chheda Harsh J <harsh.j.chheda at intel.com>
Cc: Fry Gregory P <gregory.p.fry at intel.com>
Cc: Spotswood John A <john.a.spotswood at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Signed-off-by: Jeff McGee <jeff.mcgee at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_fwif.h | 15 +++++++++++++--
 drivers/gpu/drm/i915/intel_guc_log.c  |  4 +++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 5fa2860..3ef228b 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -131,7 +131,7 @@
 #define   GUC_PROFILE_ENABLED		(1 << 7)
 #define   GUC_WQ_TRACK_ENABLED		(1 << 8)
 #define   GUC_ADS_ENABLED		(1 << 9)
-#define   GUC_DEBUG_RESERVED		(1 << 10)
+#define   GUC_CRITICAL_LOGGING_DISABLED	(1 << 10)
 #define   GUC_ADS_ADDR_SHIFT		11
 #define   GUC_ADS_ADDR_MASK		0xfffff800
 
@@ -139,6 +139,16 @@
 
 #define GUC_CTL_MAX_DWORDS		(SOFT_SCRATCH_COUNT - 2) /* [1..14] */
 
+/*
+ * Critical logging in GuC is to be enabled always from GuC v9+.
+ * (for KBL - v9.39+)
+ */
+#define GUC_NEEDS_CRITICAL_LOGGING(guc)	\
+	(((IS_SKYLAKE(guc_to_i915(guc)) || IS_BROXTON(guc_to_i915(guc))) && \
+				    guc->fw.major_ver_found >= 9) || \
+	  (IS_KABYLAKE(guc_to_i915(guc)) && guc->fw.major_ver_found >= 9 && \
+				    guc->fw.minor_ver_found >= 39))
+
 /**
  * DOC: GuC Firmware Layout
  *
@@ -539,7 +549,8 @@ struct guc_log_buffer_state {
 		u32 logging_enabled:1;
 		u32 reserved1:3;
 		u32 verbosity:4;
-		u32 reserved2:24;
+		u32 critical_logging_enabled:1;
+		u32 reserved2:23;
 	};
 	u32 value;
 } __packed;
diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c
index 16d3b87..ba36162 100644
--- a/drivers/gpu/drm/i915/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/intel_guc_log.c
@@ -589,7 +589,6 @@ void intel_guc_log_destroy(struct intel_guc *guc)
 int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 {
 	struct intel_guc *guc = &dev_priv->guc;
-
 	union guc_log_control log_param;
 	int ret;
 
@@ -603,6 +602,9 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 	if (!log_param.logging_enabled && (i915.guc_log_level < 0))
 		return 0;
 
+	if (GUC_NEEDS_CRITICAL_LOGGING(guc))
+		log_param.critical_logging_enabled = 1;
+
 	ret = guc_log_control(guc, log_param.value);
 	if (ret < 0) {
 		DRM_DEBUG_DRIVER("guc_logging_control action failed %d\n", ret);
-- 
1.9.1