[xen staging] xen/cpufreq: abstract Energy Performance Preference value

[patchbot@xxxxxxx]

commit f84366bd42e3bee5ca2ec6ef0e3ca8326db5f78c
Author:     Penny Zheng <Penny.Zheng@xxxxxxx>
AuthorDate: Wed Mar 5 15:45:10 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Mar 5 15:45:10 2025 +0100

    xen/cpufreq: abstract Energy Performance Preference value
    
    Intel's hwp Energy Performance Preference value is compatible with
    CPPC's Energy Performance Preference value, so this commit abstracts
    the value and re-place it in common header file cpufreq.h, to be
    used not only for hwp in the future.
    
    Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/acpi/cpufreq/hwp.c    | 10 +++-------
 xen/include/acpi/cpufreq/cpufreq.h | 10 ++++++++++
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/acpi/cpufreq/hwp.c b/xen/arch/x86/acpi/cpufreq/hwp.c
index 59b57a4cef..d5fa3d47ca 100644
--- a/xen/arch/x86/acpi/cpufreq/hwp.c
+++ b/xen/arch/x86/acpi/cpufreq/hwp.c
@@ -21,10 +21,6 @@ static bool __ro_after_init feature_hdc;
 
 static bool __ro_after_init opt_cpufreq_hdc = true;
 
-#define HWP_ENERGY_PERF_MAX_PERFORMANCE 0
-#define HWP_ENERGY_PERF_BALANCE         0x80
-#define HWP_ENERGY_PERF_MAX_POWERSAVE   0xff
-
 union hwp_request
 {
     struct
@@ -597,7 +593,7 @@ int set_hwp_para(struct cpufreq_policy *policy,
         data->minimum = data->hw.lowest;
         data->maximum = data->hw.lowest;
         data->activity_window = 0;
-        data->energy_perf = HWP_ENERGY_PERF_MAX_POWERSAVE;
+        data->energy_perf = CPPC_ENERGY_PERF_MAX_POWERSAVE;
         data->desired = 0;
         break;
 
@@ -605,7 +601,7 @@ int set_hwp_para(struct cpufreq_policy *policy,
         data->minimum = data->hw.highest;
         data->maximum = data->hw.highest;
         data->activity_window = 0;
-        data->energy_perf = HWP_ENERGY_PERF_MAX_PERFORMANCE;
+        data->energy_perf = CPPC_ENERGY_PERF_MAX_PERFORMANCE;
         data->desired = 0;
         break;
 
@@ -613,7 +609,7 @@ int set_hwp_para(struct cpufreq_policy *policy,
         data->minimum = data->hw.lowest;
         data->maximum = data->hw.highest;
         data->activity_window = 0;
-        data->energy_perf = HWP_ENERGY_PERF_BALANCE;
+        data->energy_perf = CPPC_ENERGY_PERF_BALANCE;
         data->desired = 0;
         break;
 
diff --git a/xen/include/acpi/cpufreq/cpufreq.h 
b/xen/include/acpi/cpufreq/cpufreq.h
index 3f1b05a02e..a3c84143af 100644
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -252,6 +252,16 @@ void cpufreq_dbs_timer_resume(void);
 
 void intel_feature_detect(struct cpufreq_policy *policy);
 
+/*
+ * If Energy Performance Preference(epp) is supported in the platform,
+ * OSPM may write a range of values from 0(performance preference)
+ * to 0xFF(energy efficiency perference) to control the platform's
+ * energy efficiency and performance optimization policies
+ */
+#define CPPC_ENERGY_PERF_MAX_PERFORMANCE 0
+#define CPPC_ENERGY_PERF_BALANCE         0x80
+#define CPPC_ENERGY_PERF_MAX_POWERSAVE   0xff
+
 int hwp_cmdline_parse(const char *s, const char *e);
 int hwp_register_driver(void);
 #ifdef CONFIG_INTEL
--
generated by git-patchbot for /home/xen/git/xen.git#staging