Messages in this thread Patch in this message | | | From | Perry Yuan <> | Subject | [PATCH v10 6/7] cpufreq: amd-pstate: introduce per CPU frequency boost control | Date | Wed, 8 May 2024 15:21:11 +0800 |
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Add a new sysfs attribute file to support per CPU frequency boost control, allowing individual CPUs to enable or disable CPB separately.
The new sysfs attribute file is located at below path, `/sys/devices/system/cpu/cpuX/cpufreq/boost`, where `X` represents the CPU number.
To disable CPB for a specific CPU, you can use the following command: $ sudo bash -c "echo 0 > /sys/devices/system/cpu/cpuX/cpufreq/boost"
After disabling CPB, the CPU frequency will no longer boost beyond the base frequency for that particular CPU.
for example: ---------------------------------------------------------------------- CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ 0 0 0 0 0:0:0:0 yes 4208.0000 400.0000 1666.7740 1 0 0 0 0:0:0:0 yes 4208.0000 400.0000 400.0000
---------------------------------------------------------------------- $ sudo bash -c "echo 0 > /sys/devices/system/cpu/cpu0/cpufreq/boost"
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ 0 0 0 0 0:0:0:0 yes 3501.0000 400.0000 4154.3140 1 0 0 0 0:0:0:0 yes 4208.0000 400.0000 400.0000
Please be aware that modifying the global variable `amd_pstate_global_params.cpb_boost` will overwrite the individual CPU settings.
Signed-off-by: Perry Yuan <perry.yuan@amd.com> --- drivers/cpufreq/amd-pstate.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 11bce2c1db32..cb0055e7c842 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1371,6 +1371,30 @@ static int amd_pstate_cpu_boost(int cpu, bool state) return ret < 0 ? ret : 0; } +static ssize_t show_boost(struct cpufreq_policy *policy, char *buf) +{ + struct amd_cpudata *cpudata = policy->driver_data; + bool boost_val; + + boost_val = READ_ONCE(cpudata->boost_state); + + return sysfs_emit(buf, "%u\n", boost_val); +} + +static ssize_t store_boost( + struct cpufreq_policy *policy, const char *buf, size_t count) +{ + bool boost_val; + int ret; + + if (sscanf(buf, "%d", &boost_val) != 1) + return -EINVAL; + + ret = amd_pstate_cpu_boost(policy->cpu, boost_val); + + return ret < 0 ? ret : count; +} + static ssize_t cpb_boost_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1416,6 +1440,7 @@ cpufreq_freq_attr_ro(amd_pstate_prefcore_ranking); cpufreq_freq_attr_ro(amd_pstate_hw_prefcore); cpufreq_freq_attr_rw(energy_performance_preference); cpufreq_freq_attr_ro(energy_performance_available_preferences); +cpufreq_freq_attr_rw(boost); static DEVICE_ATTR_RW(status); static DEVICE_ATTR_RO(prefcore); static DEVICE_ATTR_RW(cpb_boost); @@ -1426,6 +1451,7 @@ static struct freq_attr *amd_pstate_attr[] = { &amd_pstate_highest_perf, &amd_pstate_prefcore_ranking, &amd_pstate_hw_prefcore, + &boost, NULL, }; @@ -1437,6 +1463,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = { &amd_pstate_hw_prefcore, &energy_performance_preference, &energy_performance_available_preferences, + &boost, NULL, }; -- 2.34.1
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