tools/power/x86/intel-speed-select: Set scaling_max_freq to base_frequency

When BIOS disables turbo, The scaling_max_freq in cpufreq sysfs will be
limited to config level 0 base frequency. But when user selects a higher
config levels, this will result in higher base frequency. But since
scaling_max_freq is still old base frequency, the performance will still
be limited. So when the turbo is disabled and cpufreq base_frequency is
higher than scaling_max_freq, update the scaling_max_freq to the
base_frequency.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20201221071859.2783957-2-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c
index 5390158..9b6f0e6 100644 (file)
--- a/tools/power/x86/intel-speed-select/isst-config.c
+++ b/tools/power/x86/intel-speed-select/isst-config.c
@@ -1249,6 +1249,8 @@ static void dump_isst_config(int arg)
        isst_ctdp_display_information_end(outf);
 }
 
+static void adjust_scaling_max_from_base_freq(int cpu);
+
 static void set_tdp_level_for_cpu(int cpu, void *arg1, void *arg2, void *arg3,
                                  void *arg4)
 {
@@ -1267,6 +1269,9 @@ static void set_tdp_level_for_cpu(int cpu, void *arg1, void *arg2, void *arg3,
                        int pkg_id = get_physical_package_id(cpu);
                        int die_id = get_physical_die_id(cpu);
 
+                       /* Wait for updated base frequencies */
+                       usleep(2000);
+
                        fprintf(stderr, "Option is set to online/offline\n");
                        ctdp_level.core_cpumask_size =
                                alloc_cpu_set(&ctdp_level.core_cpumask);
@@ -1283,6 +1288,7 @@ static void set_tdp_level_for_cpu(int cpu, void *arg1, void *arg2, void *arg3,
                                        if (CPU_ISSET_S(i, ctdp_level.core_cpumask_size, ctdp_level.core_cpumask)) {
                                                fprintf(stderr, "online cpu %d\n", i);
                                                set_cpu_online_offline(i, 1);
+                                               adjust_scaling_max_from_base_freq(i);
                                        } else {
                                                fprintf(stderr, "offline cpu %d\n", i);
                                                set_cpu_online_offline(i, 0);
@@ -1440,6 +1446,21 @@ static int set_cpufreq_scaling_min_max(int cpu, int max, int freq)
        return 0;
 }
 
+static int no_turbo(void)
+{
+       return parse_int_file(0, "/sys/devices/system/cpu/intel_pstate/no_turbo");
+}
+
+static void adjust_scaling_max_from_base_freq(int cpu)
+{
+       int base_freq, scaling_max_freq;
+
+       scaling_max_freq = parse_int_file(0, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", cpu);
+       base_freq = get_cpufreq_base_freq(cpu);
+       if (scaling_max_freq < base_freq || no_turbo())
+               set_cpufreq_scaling_min_max(cpu, 1, base_freq);
+}
+
 static int set_clx_pbf_cpufreq_scaling_min_max(int cpu)
 {
        struct isst_pkg_ctdp_level_info *ctdp_level;