Messages in this thread Patch in this message | | | From | Doug Smythies <> | Subject | [PATCH] cpufreq: intel_pstate: Override parameters if HWP forced by BIOS | Date | Wed, 8 Sep 2021 20:48:02 -0700 |
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If HWP has been already been enabled by BIOS, it may be necessary to override some kernel command line parameters. Once it has been enabled it requires a reset to be disabled.
Signed-off-by: Doug Smythies <dsmythies@telus.net> --- drivers/cpufreq/intel_pstate.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index bb4549959b11..073bae5d4498 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -3267,7 +3267,7 @@ static int __init intel_pstate_init(void) */ if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) || intel_pstate_hwp_is_enabled()) { - hwp_active++; + hwp_active = 1; hwp_mode_bdw = id->driver_data; intel_pstate.attr = hwp_cpufreq_attrs; intel_cpufreq.attr = hwp_cpufreq_attrs; @@ -3347,17 +3347,27 @@ device_initcall(intel_pstate_init); static int __init intel_pstate_setup(char *str) { + /* + * If BIOS is forcing HWP, then parameter + * overrides might be needed. Only print + * the message once, and regardless of + * any overrides. + */ + if(!hwp_active && boot_cpu_has(X86_FEATURE_HWP)) + if(intel_pstate_hwp_is_enabled()){ + pr_info("HWP enabled by BIOS\n"); + hwp_active = 1; + } if (!str) return -EINVAL; - if (!strcmp(str, "disable")) + if (!strcmp(str, "disable") && !hwp_active) no_load = 1; - else if (!strcmp(str, "active")) + if (!strcmp(str, "active")) default_driver = &intel_pstate; - else if (!strcmp(str, "passive")) + if (!strcmp(str, "passive")) default_driver = &intel_cpufreq; - - if (!strcmp(str, "no_hwp")) { + if (!strcmp(str, "no_hwp") && !hwp_active) { pr_info("HWP disabled\n"); no_hwp = 1; } -- 2.25.1
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