github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-25 07:33:19 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

tools/power x86_energy_perf_policy: Enhance HWP enabled check

Browse Source 
Verify that all CPUs have HWP enabled, not just cpu0.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2025-09-19 13:46:55 -04:00
parent 62127655b7
commit b6b42a6051
1 changed files with 37 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
View File

@ -4,7 +4,7 @@
* policy preference bias on recent X86 processors.
*/
/*
* Copyright (c) 2010 - 2017 Intel Corporation.
* Copyright (c) 2010 - 2025 Intel Corporation.
* Len Brown <len.brown@intel.com>
*/
@ -517,7 +517,7 @@ void for_packages(unsigned long long pkg_set, int (func)(int))
void print_version(void)
{
printf("x86_energy_perf_policy 17.05.11 (C) Len Brown <len.brown@intel.com>\n");
printf("x86_energy_perf_policy 2025.9.19 Len Brown <lenb@kernel.org>\n");
}
void cmdline(int argc, char **argv)
@ -1312,6 +1312,17 @@ void for_all_cpus_in_set(size_t set_size, cpu_set_t *cpu_set, int (func)(int))
if (CPU_ISSET_S(cpu_num, set_size, cpu_set))
func(cpu_num);
}
int for_all_cpus_in_set_and(size_t set_size, cpu_set_t *cpu_set, int (func)(int))
{
int cpu_num;
int retval = 1;
for (cpu_num = 0; cpu_num <= max_cpu_num; ++cpu_num)
if (CPU_ISSET_S(cpu_num, set_size, cpu_set))
retval &= func(cpu_num);
return retval;
}
void init_data_structures(void)
{
@ -1326,21 +1337,38 @@ void init_data_structures(void)
for_all_proc_cpus(mark_cpu_present);
}
/* clear has_hwp if it is not enable (or being enabled) */
void verify_hwp_is_enabled(void)
int is_hwp_enabled_on_cpu(int cpu_num)
{
unsigned long long msr;
int retval;
/* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */
get_msr(cpu_num, MSR_PM_ENABLE, &msr);
retval = (msr & 1);
if (verbose)
fprintf(stderr, "cpu%d: %sHWP\n", cpu_num, retval ? "" : "No-");
return retval;
}
/*
* verify_hwp_is_enabled()
*
* Set (has_hwp=0) if no HWP feature or any of selected CPU set does not have HWP enabled
*/
void verify_hwp_is_enabled(void)
{
int retval;
if (!has_hwp) /* set in early_cpuid() */
return;
/* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */
get_msr(base_cpu, MSR_PM_ENABLE, &msr);
if ((msr & 1) == 0) {
retval = for_all_cpus_in_set_and(cpu_setsize, cpu_selected_set, is_hwp_enabled_on_cpu);
if (retval == 0) {
fprintf(stderr, "HWP can be enabled using '--hwp-enable'\n");
has_hwp = 0;
return;
}
}