linux-kernel - [PATCH 1/2] cpufreq: intel_pstate: Allow model specific EPPs

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Message-Id: <20240220022607.485129-2-srinivas.pandruvada@linux.intel.com>
Date: Mon, 19 Feb 2024 18:26:06 -0800
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: rafael@...nel.org,
	viresh.kumar@...aro.org
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 1/2] cpufreq: intel_pstate: Allow model specific EPPs

The current implementation allows model specific EPP override for
balanced_performance. Add feature to allow model specific EPP for all
predefined EPP strings. For example for some CPU models, even changing
performance EPP has benefits

Use a mask of EPPs as driver_data instead of just balanced_performance.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 drivers/cpufreq/intel_pstate.c | 41 +++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 6 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index ca94e60e705a..9a11228dd871 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -25,6 +25,7 @@
 #include <linux/acpi.h>
 #include <linux/vmalloc.h>
 #include <linux/pm_qos.h>
+#include <linux/bitfield.h>
 #include <trace/events/power.h>
 
 #include <asm/cpu.h>
@@ -3404,14 +3405,29 @@ static bool intel_pstate_hwp_is_enabled(void)
 	return !!(value & 0x1);
 }
 
-static const struct x86_cpu_id intel_epp_balance_perf[] = {
+#define POWERSAVE_MASK			GENMASK(7, 0)
+#define BALANCE_POWER_MASK		GENMASK(15, 8)
+#define BALANCE_PERFORMANCE_MASK	GENMASK(23, 16)
+#define PERFORMANCE_MASK		GENMASK(31, 24)
+
+#define HWP_SET_EPP_VALUES(powersave, balance_power, balance_perf, performance) \
+	(FIELD_PREP_CONST(POWERSAVE_MASK, powersave) |\
+	 FIELD_PREP_CONST(BALANCE_POWER_MASK, balance_power) |\
+	 FIELD_PREP_CONST(BALANCE_PERFORMANCE_MASK, balance_perf) |\
+	 FIELD_PREP_CONST(PERFORMANCE_MASK, performance))
+
+#define HWP_SET_DEF_BALANCE_PERF_EPP(balance_perf) \
+	(HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE, HWP_EPP_BALANCE_POWERSAVE,\
+	 balance_perf, HWP_EPP_PERFORMANCE))
+
+static const struct x86_cpu_id intel_epp_default[] = {
 	/*
 	 * Set EPP value as 102, this is the max suggested EPP
 	 * which can result in one core turbo frequency for
 	 * AlderLake Mobile CPUs.
 	 */
-	X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, 102),
-	X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, 32),
+	X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, HWP_SET_DEF_BALANCE_PERF_EPP(102)),
+	X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
 	{}
 };
 
@@ -3509,11 +3525,24 @@ static int __init intel_pstate_init(void)
 	intel_pstate_sysfs_expose_params();
 
 	if (hwp_active) {
-		const struct x86_cpu_id *id = x86_match_cpu(intel_epp_balance_perf);
+		const struct x86_cpu_id *id = x86_match_cpu(intel_epp_default);
 		const struct x86_cpu_id *hybrid_id = x86_match_cpu(intel_hybrid_scaling_factor);
 
-		if (id)
-			epp_values[EPP_INDEX_BALANCE_PERFORMANCE] = id->driver_data;
+		if (id) {
+			epp_values[EPP_INDEX_POWERSAVE] =
+					FIELD_GET(POWERSAVE_MASK, id->driver_data);
+			epp_values[EPP_INDEX_BALANCE_POWERSAVE] =
+					FIELD_GET(BALANCE_POWER_MASK, id->driver_data);
+			epp_values[EPP_INDEX_BALANCE_PERFORMANCE] =
+					FIELD_GET(BALANCE_PERFORMANCE_MASK, id->driver_data);
+			epp_values[EPP_INDEX_PERFORMANCE] =
+					FIELD_GET(PERFORMANCE_MASK, id->driver_data);
+			pr_debug("Updated EPPs powersave:%x balanced power:%x balanced perf:%x performance:%x\n",
+				 epp_values[EPP_INDEX_POWERSAVE],
+				 epp_values[EPP_INDEX_BALANCE_POWERSAVE],
+				 epp_values[EPP_INDEX_BALANCE_PERFORMANCE],
+				 epp_values[EPP_INDEX_PERFORMANCE]);
+		}
 
 		if (hybrid_id) {
 			hybrid_scaling_factor = hybrid_id->driver_data;
-- 
2.43.0