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cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies 

There is some rare cases where CPB (and possibly IDA) are missing on
processors.

This is the case fixed by commit f7f3dc00f6 ("x86/cpu/AMD: Fix
erratum 1076 (CPB bit)") and following.

In such context, the boost status isn't reported by
/sys/devices/system/cpu/cpufreq/boost.

This commit is about printing a message to report that the CPU
doesn't expose the boost capabilities.

This message could help debugging platforms hit by this phenomena.

Signed-off-by: Erwan Velu <e.velu@criteo.com>
[ rjw: Change the message text somewhat ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Erwan Velu 2019-02-20 11:10:17 +01:00 committed by Rafael J. Wysocki
parent 167a38dcd5
commit 1222d527f3
1 changed files with 3 additions and 1 deletions
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4
drivers/cpufreq/acpi-cpufreq.c
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@ -916,8 +916,10 @@ static void __init acpi_cpufreq_boost_init(void)
{
int ret;
if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)))
if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
pr_debug("Boost capabilities not present in the processor\n");
return;
}
acpi_cpufreq_driver.set_boost = set_boost;
acpi_cpufreq_driver.boost_enabled = boost_state(0);