From cf3b8e8f55e1a6c747e89599695fb8783c8a69c2 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Fri, 6 Jan 2023 17:44:26 -0800 Subject: tools/power/x86/intel-speed-select: cpufreq reads on offline CPUs Due to some recent kernel changes, reading cpufreq attributes like scaling_max_freq on offline CPUs returns error. So avoid reading cpufreq attributes on offline CPUs. Signed-off-by: Srinivas Pandruvada Signed-off-by: Hans de Goede --- tools/power/x86/intel-speed-select/isst-config.c | 33 ++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'tools/power') diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c index b549e6f0946d..2a737bff79cd 100644 --- a/tools/power/x86/intel-speed-select/isst-config.c +++ b/tools/power/x86/intel-speed-select/isst-config.c @@ -413,6 +413,33 @@ int get_topo_max_cpus(void) return topo_max_cpus; } +static unsigned int is_cpu_online(int cpu) +{ + char buffer[128]; + int fd, ret; + unsigned char online; + + snprintf(buffer, sizeof(buffer), + "/sys/devices/system/cpu/cpu%d/online", cpu); + + fd = open(buffer, O_RDONLY); + if (fd < 0) + return fd; + + ret = read(fd, &online, sizeof(online)); + close(fd); + + if (ret == -1) + return ret; + + if (online == '1') + online = 1; + else + online = 0; + + return online; +} + void set_cpu_online_offline(int cpu, int state) { char buffer[128]; @@ -1603,6 +1630,9 @@ static void set_scaling_min_to_cpuinfo_max(struct isst_id *id) if (!is_cpu_in_power_domain(i, id)) continue; + if (is_cpu_online(i) != 1) + continue; + adjust_scaling_max_from_base_freq(i); set_cpufreq_scaling_min_max_from_cpuinfo(i, 1, 0); adjust_scaling_min_from_base_freq(i); @@ -1617,6 +1647,9 @@ static void set_scaling_min_to_cpuinfo_min(struct isst_id *id) if (!is_cpu_in_power_domain(i, id)) continue; + if (is_cpu_online(i) != 1) + continue; + adjust_scaling_max_from_base_freq(i); set_cpufreq_scaling_min_max_from_cpuinfo(i, 0, 0); } -- cgit v1.2.3