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authorErwan Velu <erwanaliasr1@gmail.com>2019-02-20 11:10:17 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-02-20 13:16:06 +0100
commit1222d527f314c86a3b59a522115d62facc5a7965 (patch)
treecdc5e51c349f65198f21a7a54fb1a1628772bf02 /drivers/cpufreq
parent167a38dcd5caaa85994ac8b7d2d1c20a71cd947b (diff)
downloadlinux-1222d527f314c86a3b59a522115d62facc5a7965.tar.bz2
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 f7f3dc00f612 ("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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index d62fd374d5c7..c72258a44ba4 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -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);