linux/debian/patches/patchset-pf/amd-pstate/0030-cpufreq-amd-pstate-Add-trace-event-for-EPP-perf-upda.patch

From ea6b500eb38124a59e83254435340e0390117c54 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Thu, 5 Dec 2024 16:28:33 -0600
Subject: cpufreq/amd-pstate: Add trace event for EPP perf updates

In "active" mode the most important thing for debugging whether
an issue is hardware or software based is to look at what was the
last thing written to the CPPC request MSR or shared memory region.

The 'amd_pstate_epp_perf' trace event shows the values being written
for all CPUs.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
---
 drivers/cpufreq/amd-pstate-trace.h | 45 ++++++++++++++++++++++++++++++
 drivers/cpufreq/amd-pstate.c       | 28 +++++++++++++++++++
 2 files changed, 73 insertions(+)

--- a/drivers/cpufreq/amd-pstate-trace.h
+++ b/drivers/cpufreq/amd-pstate-trace.h
@@ -88,6 +88,51 @@ TRACE_EVENT(amd_pstate_perf,
 		 )
 );
 
+TRACE_EVENT(amd_pstate_epp_perf,
+
+	TP_PROTO(unsigned int cpu_id,
+		 unsigned int highest_perf,
+		 unsigned int epp,
+		 unsigned int min_perf,
+		 unsigned int max_perf,
+		 bool boost
+		 ),
+
+	TP_ARGS(cpu_id,
+		highest_perf,
+		epp,
+		min_perf,
+		max_perf,
+		boost),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, cpu_id)
+		__field(unsigned int, highest_perf)
+		__field(unsigned int, epp)
+		__field(unsigned int, min_perf)
+		__field(unsigned int, max_perf)
+		__field(bool, boost)
+		),
+
+	TP_fast_assign(
+		__entry->cpu_id = cpu_id;
+		__entry->highest_perf = highest_perf;
+		__entry->epp = epp;
+		__entry->min_perf = min_perf;
+		__entry->max_perf = max_perf;
+		__entry->boost = boost;
+		),
+
+	TP_printk("cpu%u: [%u<->%u]/%u, epp=%u, boost=%u",
+		  (unsigned int)__entry->cpu_id,
+		  (unsigned int)__entry->min_perf,
+		  (unsigned int)__entry->max_perf,
+		  (unsigned int)__entry->highest_perf,
+		  (unsigned int)__entry->epp,
+		  (bool)__entry->boost
+		 )
+);
+
 #endif /* _AMD_PSTATE_TRACE_H */
 
 /* This part must be outside protection */
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -354,6 +354,14 @@ static int amd_pstate_set_energy_pref_in
 		return -EBUSY;
 	}
 
+	if (trace_amd_pstate_epp_perf_enabled()) {
+		trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf,
+					  epp,
+					  AMD_CPPC_MIN_PERF(cpudata->cppc_req_cached),
+					  AMD_CPPC_MAX_PERF(cpudata->cppc_req_cached),
+					  cpudata->boost_state);
+	}
+
 	ret = amd_pstate_set_epp(cpudata, epp);
 
 	return ret;
@@ -1626,6 +1634,13 @@ static int amd_pstate_epp_update_limit(s
 
 	WRITE_ONCE(cpudata->cppc_req_cached, value);
 
+	if (trace_amd_pstate_epp_perf_enabled()) {
+		trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf, epp,
+					  cpudata->min_limit_perf,
+					  cpudata->max_limit_perf,
+					  cpudata->boost_state);
+	}
+
 	amd_pstate_update_perf(cpudata, cpudata->min_limit_perf, 0U,
 			       cpudata->max_limit_perf, false);
 
@@ -1669,6 +1684,13 @@ static void amd_pstate_epp_reenable(stru
 
 	max_perf = READ_ONCE(cpudata->highest_perf);
 
+	if (trace_amd_pstate_epp_perf_enabled()) {
+		trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf,
+					  cpudata->epp_cached,
+					  AMD_CPPC_MIN_PERF(cpudata->cppc_req_cached),
+					  max_perf, cpudata->boost_state);
+	}
+
 	amd_pstate_update_perf(cpudata, 0, 0, max_perf, false);
 	amd_pstate_set_epp(cpudata, cpudata->epp_cached);
 }
@@ -1697,6 +1719,12 @@ static int amd_pstate_epp_cpu_offline(st
 
 	mutex_lock(&amd_pstate_limits_lock);
 
+	if (trace_amd_pstate_epp_perf_enabled()) {
+		trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf,
+					  AMD_CPPC_EPP_BALANCE_POWERSAVE,
+					  min_perf, min_perf, cpudata->boost_state);
+	}
+
 	amd_pstate_update_perf(cpudata, min_perf, 0, min_perf, false);
 	amd_pstate_set_epp(cpudata, AMD_CPPC_EPP_BALANCE_POWERSAVE);