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linux/debian/patches/patchset-pf/amd-pstate/0013-cpufreq-amd-pstate-Drop-min-and-max-cached-frequenci.patch
Konstantin Demin 12ad6316be release 6.14.1
2025-04-07 13:34:51 +03:00

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7.4 KiB
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From 72016df62985637e59f075e25233d8ca942eb391 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Wed, 26 Feb 2025 01:49:18 -0600
Subject: cpufreq/amd-pstate: Drop min and max cached frequencies
Use the perf_to_freq helpers to calculate this on the fly.
As the members are no longer cached add an extra check into
amd_pstate_epp_update_limit() to avoid unnecessary calls in
amd_pstate_update_min_max_limit().
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
drivers/cpufreq/amd-pstate-ut.c | 14 +++++------
drivers/cpufreq/amd-pstate.c | 43 +++++++++------------------------
drivers/cpufreq/amd-pstate.h | 9 ++-----
3 files changed, 20 insertions(+), 46 deletions(-)
--- a/drivers/cpufreq/amd-pstate-ut.c
+++ b/drivers/cpufreq/amd-pstate-ut.c
@@ -214,14 +214,14 @@ static void amd_pstate_ut_check_freq(u32
break;
cpudata = policy->driver_data;
- if (!((cpudata->max_freq >= cpudata->nominal_freq) &&
+ if (!((policy->cpuinfo.max_freq >= cpudata->nominal_freq) &&
(cpudata->nominal_freq > cpudata->lowest_nonlinear_freq) &&
- (cpudata->lowest_nonlinear_freq > cpudata->min_freq) &&
- (cpudata->min_freq > 0))) {
+ (cpudata->lowest_nonlinear_freq > policy->cpuinfo.min_freq) &&
+ (policy->cpuinfo.min_freq > 0))) {
amd_pstate_ut_cases[index].result = AMD_PSTATE_UT_RESULT_FAIL;
pr_err("%s cpu%d max=%d >= nominal=%d > lowest_nonlinear=%d > min=%d > 0, the formula is incorrect!\n",
- __func__, cpu, cpudata->max_freq, cpudata->nominal_freq,
- cpudata->lowest_nonlinear_freq, cpudata->min_freq);
+ __func__, cpu, policy->cpuinfo.max_freq, cpudata->nominal_freq,
+ cpudata->lowest_nonlinear_freq, policy->cpuinfo.min_freq);
goto skip_test;
}
@@ -233,13 +233,13 @@ static void amd_pstate_ut_check_freq(u32
}
if (cpudata->boost_supported) {
- if ((policy->max == cpudata->max_freq) ||
+ if ((policy->max == policy->cpuinfo.max_freq) ||
(policy->max == cpudata->nominal_freq))
amd_pstate_ut_cases[index].result = AMD_PSTATE_UT_RESULT_PASS;
else {
amd_pstate_ut_cases[index].result = AMD_PSTATE_UT_RESULT_FAIL;
pr_err("%s cpu%d policy_max=%d should be equal cpu_max=%d or cpu_nominal=%d !\n",
- __func__, cpu, policy->max, cpudata->max_freq,
+ __func__, cpu, policy->max, policy->cpuinfo.max_freq,
cpudata->nominal_freq);
goto skip_test;
}
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -717,7 +717,7 @@ static int amd_pstate_cpu_boost_update(s
int ret = 0;
nominal_freq = READ_ONCE(cpudata->nominal_freq);
- max_freq = READ_ONCE(cpudata->max_freq);
+ max_freq = perf_to_freq(cpudata, READ_ONCE(cpudata->highest_perf));
if (on)
policy->cpuinfo.max_freq = max_freq;
@@ -917,13 +917,10 @@ static int amd_pstate_init_freq(struct a
nominal_freq *= 1000;
WRITE_ONCE(cpudata->nominal_freq, nominal_freq);
- WRITE_ONCE(cpudata->min_freq, min_freq);
max_freq = perf_to_freq(cpudata, cpudata->highest_perf);
lowest_nonlinear_freq = perf_to_freq(cpudata, cpudata->lowest_nonlinear_perf);
-
WRITE_ONCE(cpudata->lowest_nonlinear_freq, lowest_nonlinear_freq);
- WRITE_ONCE(cpudata->max_freq, max_freq);
/**
* Below values need to be initialized correctly, otherwise driver will fail to load
@@ -948,9 +945,9 @@ static int amd_pstate_init_freq(struct a
static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
{
- int min_freq, max_freq, ret;
- struct device *dev;
struct amd_cpudata *cpudata;
+ struct device *dev;
+ int ret;
/*
* Resetting PERF_CTL_MSR will put the CPU in P0 frequency,
@@ -981,17 +978,11 @@ static int amd_pstate_cpu_init(struct cp
if (ret)
goto free_cpudata1;
- min_freq = READ_ONCE(cpudata->min_freq);
- max_freq = READ_ONCE(cpudata->max_freq);
-
policy->cpuinfo.transition_latency = amd_pstate_get_transition_latency(policy->cpu);
policy->transition_delay_us = amd_pstate_get_transition_delay_us(policy->cpu);
- policy->min = min_freq;
- policy->max = max_freq;
-
- policy->cpuinfo.min_freq = min_freq;
- policy->cpuinfo.max_freq = max_freq;
+ policy->cpuinfo.min_freq = policy->min = perf_to_freq(cpudata, cpudata->lowest_perf);
+ policy->cpuinfo.max_freq = policy->max = perf_to_freq(cpudata, cpudata->highest_perf);
policy->boost_enabled = READ_ONCE(cpudata->boost_supported);
@@ -1015,9 +1006,6 @@ static int amd_pstate_cpu_init(struct cp
goto free_cpudata2;
}
- cpudata->max_limit_freq = max_freq;
- cpudata->min_limit_freq = min_freq;
-
policy->driver_data = cpudata;
if (!current_pstate_driver->adjust_perf)
@@ -1075,14 +1063,10 @@ static int amd_pstate_cpu_suspend(struct
static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
char *buf)
{
- int max_freq;
struct amd_cpudata *cpudata = policy->driver_data;
- max_freq = READ_ONCE(cpudata->max_freq);
- if (max_freq < 0)
- return max_freq;
- return sysfs_emit(buf, "%u\n", max_freq);
+ return sysfs_emit(buf, "%u\n", perf_to_freq(cpudata, READ_ONCE(cpudata->highest_perf)));
}
static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy,
@@ -1440,10 +1424,10 @@ static bool amd_pstate_acpi_pm_profile_u
static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
{
- int min_freq, max_freq, ret;
struct amd_cpudata *cpudata;
struct device *dev;
u64 value;
+ int ret;
/*
* Resetting PERF_CTL_MSR will put the CPU in P0 frequency,
@@ -1474,19 +1458,13 @@ static int amd_pstate_epp_cpu_init(struc
if (ret)
goto free_cpudata1;
- min_freq = READ_ONCE(cpudata->min_freq);
- max_freq = READ_ONCE(cpudata->max_freq);
-
- policy->cpuinfo.min_freq = min_freq;
- policy->cpuinfo.max_freq = max_freq;
+ policy->cpuinfo.min_freq = policy->min = perf_to_freq(cpudata, cpudata->lowest_perf);
+ policy->cpuinfo.max_freq = policy->max = perf_to_freq(cpudata, cpudata->highest_perf);
/* It will be updated by governor */
policy->cur = policy->cpuinfo.min_freq;
policy->driver_data = cpudata;
- policy->min = policy->cpuinfo.min_freq;
- policy->max = policy->cpuinfo.max_freq;
-
policy->boost_enabled = READ_ONCE(cpudata->boost_supported);
/*
@@ -1544,7 +1522,8 @@ static int amd_pstate_epp_update_limit(s
struct amd_cpudata *cpudata = policy->driver_data;
u8 epp;
- amd_pstate_update_min_max_limit(policy);
+ if (policy->min != cpudata->min_limit_freq || policy->max != cpudata->max_limit_freq)
+ amd_pstate_update_min_max_limit(policy);
if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE)
epp = 0;
--- a/drivers/cpufreq/amd-pstate.h
+++ b/drivers/cpufreq/amd-pstate.h
@@ -46,8 +46,6 @@ struct amd_aperf_mperf {
* @max_limit_perf: Cached value of the performance corresponding to policy->max
* @min_limit_freq: Cached value of policy->min (in khz)
* @max_limit_freq: Cached value of policy->max (in khz)
- * @max_freq: the frequency (in khz) that mapped to highest_perf
- * @min_freq: the frequency (in khz) that mapped to lowest_perf
* @nominal_freq: the frequency (in khz) that mapped to nominal_perf
* @lowest_nonlinear_freq: the frequency (in khz) that mapped to lowest_nonlinear_perf
* @cur: Difference of Aperf/Mperf/tsc count between last and current sample
@@ -77,11 +75,8 @@ struct amd_cpudata {
u8 prefcore_ranking;
u8 min_limit_perf;
u8 max_limit_perf;
- u32 min_limit_freq;
- u32 max_limit_freq;
-
- u32 max_freq;
- u32 min_freq;
+ u32 min_limit_freq;
+ u32 max_limit_freq;
u32 nominal_freq;
u32 lowest_nonlinear_freq;
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