From GuC v9 firmware (for KBL v9.39+), separate control is added to enable
critical logging in GuC to enable capturing minimal important logs in
production systems.
i915.guc_log_level controls the verbosity and logging in GuC for logs other
than critical logs. By default, logging in GuC is disabled through
i915.guc_log_level.
This patch introduces new kernel param i915.enable_guc_critical_logging.
For Linux release builds, if needed critical GuC logs can be enabled
separately through this parameter. GuC log snapshot captured in error state
will have these minimal critical events logged.
Default value for this parameter is currently set to false.
This patch updates the initialization parameter sent during GuC load to
disable critical logging unless i915.guc_log_level is set to enable logging
and ensures it is enabled/disabling while enabling/disabling through
debugfs based on i915.enable_guc_critical_logging.

Cc: Arkadiusz Hiler <arkadiusz.hi...@intel.com>
Cc: Spotswood John A <john.a.spotsw...@intel.com>
Cc: Anusha Srivatsa <anusha.sriva...@intel.com>
Signed-off-by: Jeff McGee <jeff.mc...@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kam...@intel.com>
---
 drivers/gpu/drm/i915/i915_params.c      |  5 +++++
 drivers/gpu/drm/i915/i915_params.h      |  3 ++-
 drivers/gpu/drm/i915/intel_guc_fwif.h   | 14 +++++++++++++-
 drivers/gpu/drm/i915/intel_guc_loader.c | 21 ++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_guc_log.c    |  9 ++++++++-
 5 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c 
b/drivers/gpu/drm/i915/i915_params.c
index 14e2c2e..902bf2c 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -59,6 +59,7 @@ struct i915_params i915 __read_mostly = {
        .enable_guc_loading = 0,
        .enable_guc_submission = 0,
        .guc_log_level = -1,
+       .enable_guc_critical_logging = false,
        .guc_firmware_path = NULL,
        .huc_firmware_path = NULL,
        .enable_dp_mst = true,
@@ -232,6 +233,10 @@ struct i915_params i915 __read_mostly = {
 MODULE_PARM_DESC(guc_log_level,
        "GuC firmware logging level (-1:disabled (default), 0-3:enabled)");
 
+module_param_named(enable_guc_critical_logging, 
i915.enable_guc_critical_logging, bool, 0400);
+MODULE_PARM_DESC(enable_guc_critical_logging,
+       "Enable GuC firmware critical logging (default: false)");
+
 module_param_named_unsafe(guc_firmware_path, i915.guc_firmware_path, charp, 
0400);
 MODULE_PARM_DESC(guc_firmware_path,
        "GuC firmware path to use instead of the default one");
diff --git a/drivers/gpu/drm/i915/i915_params.h 
b/drivers/gpu/drm/i915/i915_params.h
index febbfdb..7c208f0 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -67,7 +67,8 @@
        func(bool, nuclear_pageflip); \
        func(bool, enable_dp_mst); \
        func(bool, enable_dpcd_backlight); \
-       func(bool, enable_gvt)
+       func(bool, enable_gvt); \
+       func(bool, enable_guc_critical_logging)
 
 #define MEMBER(T, member) T member
 struct i915_params {
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h 
b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 5fa2860..353b081 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -132,6 +132,7 @@
 #define   GUC_WQ_TRACK_ENABLED         (1 << 8)
 #define   GUC_ADS_ENABLED              (1 << 9)
 #define   GUC_DEBUG_RESERVED           (1 << 10)
+#define   GUC_V9_CRITICAL_LOGGING_DISABLED     (1 << 10)
 #define   GUC_ADS_ADDR_SHIFT           11
 #define   GUC_ADS_ADDR_MASK            0xfffff800
 
@@ -139,6 +140,16 @@
 
 #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 NEEDS_GUC_CRITICAL_LOGGING(dev_priv, guc_fw)   \
+       (((IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv)) && \
+                                   guc_fw->major_ver_found >= 9) || \
+         (IS_KABYLAKE(dev_priv) && guc_fw->major_ver_found >= 9 && \
+                                   guc_fw->minor_ver_found >= 39))
+
 /**
  * DOC: GuC Firmware Layout
  *
@@ -539,7 +550,8 @@ 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_loader.c 
b/drivers/gpu/drm/i915/intel_guc_loader.c
index 81e03a6..535c665 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -106,8 +106,10 @@ static u32 get_core_family(struct drm_i915_private 
*dev_priv)
 static void guc_params_init(struct drm_i915_private *dev_priv)
 {
        struct intel_guc *guc = &dev_priv->guc;
+       struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
        u32 params[GUC_CTL_MAX_DWORDS];
        int i;
+       bool enable_critical_logging = false;
 
        memset(&params, 0, sizeof(params));
 
@@ -130,11 +132,28 @@ static void guc_params_init(struct drm_i915_private 
*dev_priv)
 
        params[GUC_CTL_LOG_PARAMS] = guc->log.flags;
 
+       /*
+        * Enable critical logging in GuC based on i915.guc_log_level and
+        * i915.enable_guc_critical_logging.
+        */
        if (i915.guc_log_level >= 0) {
                params[GUC_CTL_DEBUG] =
                        i915.guc_log_level << GUC_LOG_VERBOSITY_SHIFT;
-       } else
+               enable_critical_logging = true;
+       } else {
                params[GUC_CTL_DEBUG] = GUC_LOG_DISABLED;
+               if (i915.enable_guc_critical_logging)
+                       enable_critical_logging = true;
+       }
+
+       if (NEEDS_GUC_CRITICAL_LOGGING(dev_priv, guc_fw)) {
+               if (enable_critical_logging)
+                       params[GUC_CTL_DEBUG] &=
+                               ~GUC_V9_CRITICAL_LOGGING_DISABLED;
+               else
+                       params[GUC_CTL_DEBUG] |=
+                               GUC_V9_CRITICAL_LOGGING_DISABLED;
+       }
 
        /* If GuC submission is enabled, set up additional parameters here */
        if (i915.enable_guc_submission) {
diff --git a/drivers/gpu/drm/i915/intel_guc_log.c 
b/drivers/gpu/drm/i915/intel_guc_log.c
index 16d3b87..2f9bf79 100644
--- a/drivers/gpu/drm/i915/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/intel_guc_log.c
@@ -589,7 +589,7 @@ 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;
-
+       struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
        union guc_log_control log_param;
        int ret;
 
@@ -603,6 +603,13 @@ 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 (NEEDS_GUC_CRITICAL_LOGGING(dev_priv, guc_fw)) {
+               log_param.critical_logging_enabled = 1;
+               if (!log_param.logging_enabled &&
+                   !i915.enable_guc_critical_logging)
+                       log_param.critical_logging_enabled = 0;
+       }
+
        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

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