Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tools/power x86_energy_perf_policy: Enhance HWP enabled check
Verify that all CPUs have HWP enabled, not just cpu0.
Signed-off-by: Len Brown <len.brown@intel.com>
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tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
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tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
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* policy preference bias on recent X86 processors.
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*/
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/*
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* Copyright (c) 2010 - 2017 Intel Corporation.
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* Copyright (c) 2010 - 2025 Intel Corporation.
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* Len Brown <len.brown@intel.com>
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*/
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···
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void print_version(void)
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{
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printf("x86_energy_perf_policy 17.05.11 (C) Len Brown <len.brown@intel.com>\n");
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printf("x86_energy_perf_policy 2025.9.19 Len Brown <lenb@kernel.org>\n");
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}
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void cmdline(int argc, char **argv)
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if (CPU_ISSET_S(cpu_num, set_size, cpu_set))
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func(cpu_num);
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}
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int for_all_cpus_in_set_and(size_t set_size, cpu_set_t *cpu_set, int (func)(int))
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{
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int cpu_num;
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int retval = 1;
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for (cpu_num = 0; cpu_num <= max_cpu_num; ++cpu_num)
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if (CPU_ISSET_S(cpu_num, set_size, cpu_set))
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retval &= func(cpu_num);
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return retval;
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}
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void init_data_structures(void)
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{
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for_all_proc_cpus(mark_cpu_present);
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}
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/* clear has_hwp if it is not enable (or being enabled) */
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void verify_hwp_is_enabled(void)
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int is_hwp_enabled_on_cpu(int cpu_num)
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{
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unsigned long long msr;
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int retval;
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/* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */
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get_msr(cpu_num, MSR_PM_ENABLE, &msr);
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retval = (msr & 1);
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if (verbose)
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fprintf(stderr, "cpu%d: %sHWP\n", cpu_num, retval ? "" : "No-");
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return retval;
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}
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/*
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* verify_hwp_is_enabled()
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*
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* Set (has_hwp=0) if no HWP feature or any of selected CPU set does not have HWP enabled
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*/
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void verify_hwp_is_enabled(void)
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{
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int retval;
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if (!has_hwp) /* set in early_cpuid() */
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return;
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/* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */
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get_msr(base_cpu, MSR_PM_ENABLE, &msr);
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if ((msr & 1) == 0) {
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retval = for_all_cpus_in_set_and(cpu_setsize, cpu_selected_set, is_hwp_enabled_on_cpu);
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if (retval == 0) {
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fprintf(stderr, "HWP can be enabled using '--hwp-enable'\n");
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has_hwp = 0;
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return;
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}
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}
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