[PATCH v2 1/3] drm/i915: Report steering details in debugfs

[Matt Roper <matthew.d.roper@xxxxxxxxx>]

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)

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/intel_gt.c          | 46 +++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_gt.h          |  2 +
 drivers/gpu/drm/i915/gt/intel_gt_debugfs.c  | 13 ++++++
 drivers/gpu/drm/i915/gt/intel_gt_types.h    |  5 +++
 drivers/gpu/drm/i915/gt/intel_workarounds.c |  8 +++-
 5 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 8a2483ccbfb9..4c7ad9d14f4f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -96,6 +96,12 @@ int intel_gt_assign_ggtt(struct intel_gt *gt)
 	return gt->ggtt ? 0 : -ENOMEM;
 }
 
+static const char *intel_steering_types[] = {
+	"L3BANK",
+	"MSLICE",
+	"LNCF",
+};
+
 static const struct intel_mmio_range icl_l3bank_steering_table[] = {
 	{ 0x00B100, 0x00B3FF },
 	{},
@@ -932,6 +938,46 @@ u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg)
 	return intel_uncore_read(gt->uncore, reg);
 }
 
+static void report_steering_type(struct drm_printer *p,
+				 struct intel_gt *gt,
+				 enum intel_steering_type type,
+				 bool dump_table)
+{
+	const struct intel_mmio_range *entry;
+	u8 slice, subslice;
+
+	BUILD_BUG_ON(ARRAY_SIZE(intel_steering_types) != NUM_STEERING_TYPES);
+
+	if (!gt->steering_table[type]) {
+		drm_printf(p, "%s steering: uses default steering\n",
+			   intel_steering_types[type]);
+		return;
+	}
+
+	intel_gt_get_valid_steering(gt, type, &slice, &subslice);
+	drm_printf(p, "%s steering: sliceid=0x%x, subsliceid=0x%x\n",
+		   intel_steering_types[type], slice, subslice);
+
+	if (!dump_table)
+		return;
+
+	for (entry = gt->steering_table[type]; entry->end; entry++)
+		drm_printf(p, "\t0x%06x - 0x%06x\n", entry->start, entry->end);
+}
+
+void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
+			      bool dump_table)
+{
+	drm_printf(p, "Default steering: sliceid=0x%x, subsliceid=0x%x\n",
+		   gt->default_steering.groupid,
+		   gt->default_steering.instanceid);
+
+	if (HAS_MSLICES(gt->i915)) {
+		report_steering_type(p, gt, MSLICE, dump_table);
+		report_steering_type(p, gt, LNCF, dump_table);
+	}
+}
+
 void intel_gt_info_print(const struct intel_gt_info *info,
 			 struct drm_printer *p)
 {
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 0f571c8ee22b..3edece1865e4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -87,6 +87,8 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt,
 u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg);
 u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg);
 
+void intel_gt_report_steering(struct drm_printer *p, struct intel_gt *gt,
+			      bool dump_table);
 void intel_gt_info_print(const struct intel_gt_info *info,
 			 struct drm_printer *p);
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
index f103664b71d4..6f45b131a001 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
@@ -6,6 +6,7 @@
 #include <linux/debugfs.h>
 
 #include "i915_drv.h"
+#include "intel_gt.h"
 #include "intel_gt_debugfs.h"
 #include "intel_gt_engines_debugfs.h"
 #include "intel_gt_pm_debugfs.h"
@@ -57,10 +58,22 @@ static int __intel_gt_debugfs_reset_store(void *data, u64 val)
 DEFINE_SIMPLE_ATTRIBUTE(reset_fops, __intel_gt_debugfs_reset_show,
 			__intel_gt_debugfs_reset_store, "%llu\n");
 
+static int steering_show(struct seq_file *m, void *data)
+{
+	struct drm_printer p = drm_seq_file_printer(m);
+	struct intel_gt *gt = m->private;
+
+	intel_gt_report_steering(&p, gt, true);
+
+	return 0;
+}
+DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(steering);
+
 static void gt_debugfs_register(struct intel_gt *gt, struct dentry *root)
 {
 	static const struct intel_gt_debugfs_file files[] = {
 		{ "reset", &reset_fops, NULL },
+		{ "steering", &steering_fops },
 	};
 
 	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index f20687796490..7781ab84e7a3 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -182,6 +182,11 @@ struct intel_gt {
 
 	const struct intel_mmio_range *steering_table[NUM_STEERING_TYPES];
 
+	struct {
+		u8 groupid;
+		u8 instanceid;
+	} default_steering;
+
 	struct intel_gt_info {
 		intel_engine_mask_t engine_mask;
 
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
-- 
2.34.1