cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

The firmware interface used by the pcc-cpufreq driver is
fundamentally not scalable and using it for dynamic CPU performance
scaling on systems with many CPUs leads to degraded performance.

For this reason, disable dynamic CPU performance scaling on systems
with pcc-cpufreq where the number of CPUs present at the driver init
time is greater than 4.  Also make the driver print corresponding
complaints to the kernel log.

Reported-by: Andreas Herrmann <aherrmann@suse.com>
Tested-by: Andreas Herrmann <aherrmann@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index 3f0ce2a..ef8d984 100644 (file)
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -589,6 +589,15 @@ static int __init pcc_cpufreq_init(void)
                return ret;
        }
 
+       if (num_present_cpus() > 4) {
+               pcc_cpufreq_driver.flags |= CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING;
+               pr_err("%s: Too many CPUs, dynamic performance scaling disabled\n",
+                      __func__);
+               pr_err("%s: Try to enable another scaling driver through BIOS settings\n",
+                      __func__);
+               pr_err("%s: and complain to the system vendor\n", __func__);
+       }
+
        ret = cpufreq_register_driver(&pcc_cpufreq_driver);
 
        return ret;