drm/i915: Report steering details in debugfs

Add a new 'steering' node in each gt's debugfs directory that tells
whether we're using explicit steering for various types of MCR ranges
and, if so, what MMIO ranges it applies to.

We're going to be transitioning away from implicit steering, even for
slice/dss steering soon, so the information reported here will become
increasingly valuable once that happens.

v2:
 - Adding missing 'static' on intel_steering_types[]  (Jose, sparse)
v3:
 - "static const char *" -> "static const char * const" (sparse)

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220315170250.954380-1-matthew.d.roper@intel.com

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index beca8735bae5..c328d46f8095 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1072,9 +1072,15 @@ static void __set_mcr_steering(struct i915_wa_list *wal,
 static void __add_mcr_wa(struct intel_gt *gt, struct i915_wa_list *wal,
 			 unsigned int slice, unsigned int subslice)
 {
-	drm_dbg(&gt->i915->drm, "MCR slice=0x%x, subslice=0x%x\n", slice, subslice);
+	struct drm_printer p = drm_debug_printer("MCR Steering:");
 
 	__set_mcr_steering(wal, GEN8_MCR_SELECTOR, slice, subslice);
+
+	gt->default_steering.groupid = slice;
+	gt->default_steering.instanceid = subslice;
+
+	if (drm_debug_enabled(DRM_UT_DRIVER))
+		intel_gt_report_steering(&p, gt, false);
 }
 
 static void