tools/power turbostat: allow running without cpu0

Linux-3.7 added CONFIG_BOOTPARAM_HOTPLUG_CPU0,
allowing systems to offline cpu0.

But when cpu0 is offline, turbostat will not run:

 # turbostat ls
turbostat: no /dev/cpu/0/msr

This patch replaces the hard-coded use of cpu0 in turbostat
with the current cpu, allowing it to run without a cpu0.

Fewer cross-calls may also be needed due to use of current cpu,
though this hard-coding was used only for the --debug preamble.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index f92211e9e70c3a2acfe3ede39d0024c8fc820047..68e77fdd4c04116878da5ee59a236dd8c9fc1a7e 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -92,6 +92,7 @@ unsigned int do_gfx_perf_limit_reasons;
 unsigned int do_ring_perf_limit_reasons;
 unsigned int crystal_hz;
 unsigned long long tsc_hz;
+int base_cpu;
 
 #define RAPL_PKG               (1 << 0)
                                        /* 0x610 MSR_PKG_POWER_LIMIT */
@@ -1154,7 +1155,7 @@ dump_nhm_platform_info(void)
        unsigned long long msr;
        unsigned int ratio;
 
-       get_msr(0, MSR_NHM_PLATFORM_INFO, &msr);
+       get_msr(base_cpu, MSR_NHM_PLATFORM_INFO, &msr);
 
        fprintf(stderr, "cpu0: MSR_NHM_PLATFORM_INFO: 0x%08llx\n", msr);
 
@@ -1166,7 +1167,7 @@ dump_nhm_platform_info(void)
        fprintf(stderr, "%d * %.0f = %.0f MHz base frequency\n",
                ratio, bclk, ratio * bclk);
 
-       get_msr(0, MSR_IA32_POWER_CTL, &msr);
+       get_msr(base_cpu, MSR_IA32_POWER_CTL, &msr);
        fprintf(stderr, "cpu0: MSR_IA32_POWER_CTL: 0x%08llx (C1E auto-promotion: %sabled)\n",
                msr, msr & 0x2 ? "EN" : "DIS");
 
@@ -1179,7 +1180,7 @@ dump_hsw_turbo_ratio_limits(void)
        unsigned long long msr;
        unsigned int ratio;
 
-       get_msr(0, MSR_TURBO_RATIO_LIMIT2, &msr);
+       get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT2, &msr);
 
        fprintf(stderr, "cpu0: MSR_TURBO_RATIO_LIMIT2: 0x%08llx\n", msr);
 
@@ -1201,7 +1202,7 @@ dump_ivt_turbo_ratio_limits(void)
        unsigned long long msr;
        unsigned int ratio;
 
-       get_msr(0, MSR_TURBO_RATIO_LIMIT1, &msr);
+       get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT1, &msr);
 
        fprintf(stderr, "cpu0: MSR_TURBO_RATIO_LIMIT1: 0x%08llx\n", msr);
 
@@ -1253,7 +1254,7 @@ dump_nhm_turbo_ratio_limits(void)
        unsigned long long msr;
        unsigned int ratio;
 
-       get_msr(0, MSR_TURBO_RATIO_LIMIT, &msr);
+       get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT, &msr);
 
        fprintf(stderr, "cpu0: MSR_TURBO_RATIO_LIMIT: 0x%08llx\n", msr);
 
@@ -1309,7 +1310,7 @@ dump_knl_turbo_ratio_limits(void)
        int delta_ratio;
        int i;
 
-       get_msr(0, MSR_NHM_TURBO_RATIO_LIMIT, &msr);
+       get_msr(base_cpu, MSR_NHM_TURBO_RATIO_LIMIT, &msr);
 
        fprintf(stderr, "cpu0: MSR_NHM_TURBO_RATIO_LIMIT: 0x%08llx\n",
        msr);
@@ -1365,7 +1366,7 @@ dump_nhm_cst_cfg(void)
 {
        unsigned long long msr;
 
-       get_msr(0, MSR_NHM_SNB_PKG_CST_CFG_CTL, &msr);
+       get_msr(base_cpu, MSR_NHM_SNB_PKG_CST_CFG_CTL, &msr);
 
 #define SNB_C1_AUTO_UNDEMOTE              (1UL << 27)
 #define SNB_C3_AUTO_UNDEMOTE              (1UL << 28)
@@ -1694,8 +1695,10 @@ restart:
 void check_dev_msr()
 {
        struct stat sb;
+       char pathname[32];
 
-       if (stat("/dev/cpu/0/msr", &sb))
+       sprintf(pathname, "/dev/cpu/%d/msr", base_cpu);
+       if (stat(pathname, &sb))
                if (system("/sbin/modprobe msr > /dev/null 2>&1"))
                        err(-5, "no /dev/cpu/0/msr, Try \"# modprobe msr\" ");
 }
@@ -1708,6 +1711,7 @@ void check_permissions()
        cap_user_data_t cap_data = &cap_data_data;
        extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
        int do_exit = 0;
+       char pathname[32];
 
        /* check for CAP_SYS_RAWIO */
        cap_header->pid = getpid();
@@ -1722,7 +1726,8 @@ void check_permissions()
        }
 
        /* test file permissions */
-       if (euidaccess("/dev/cpu/0/msr", R_OK)) {
+       sprintf(pathname, "/dev/cpu/%d/msr", base_cpu);
+       if (euidaccess(pathname, R_OK)) {
                do_exit++;
                warn("/dev/cpu/0/msr open failed, try chown or chmod +r /dev/cpu/*/msr");
        }
@@ -1804,7 +1809,7 @@ int probe_nhm_msrs(unsigned int family, unsigned int model)
        default:
                return 0;
        }
-       get_msr(0, MSR_NHM_SNB_PKG_CST_CFG_CTL, &msr);
+       get_msr(base_cpu, MSR_NHM_SNB_PKG_CST_CFG_CTL, &msr);
 
        pkg_cstate_limit = pkg_cstate_limits[msr & 0xF];
 
@@ -2043,7 +2048,7 @@ double get_tdp(model)
        unsigned long long msr;
 
        if (do_rapl & RAPL_PKG_POWER_INFO)
-               if (!get_msr(0, MSR_PKG_POWER_INFO, &msr))
+               if (!get_msr(base_cpu, MSR_PKG_POWER_INFO, &msr))
                        return ((msr >> 0) & RAPL_POWER_GRANULARITY) * rapl_power_units;
 
        switch (model) {
@@ -2126,7 +2131,7 @@ void rapl_probe(unsigned int family, unsigned int model)
        }
 
        /* units on package 0, verify later other packages match */
-       if (get_msr(0, MSR_RAPL_POWER_UNIT, &msr))
+       if (get_msr(base_cpu, MSR_RAPL_POWER_UNIT, &msr))
                return;
 
        rapl_power_units = 1.0 / (1 << (msr & 0xF));
@@ -2471,7 +2476,7 @@ double slm_bclk(void)
        unsigned int i;
        double freq;
 
-       if (get_msr(0, MSR_FSB_FREQ, &msr))
+       if (get_msr(base_cpu, MSR_FSB_FREQ, &msr))
                fprintf(stderr, "SLM BCLK: unknown\n");
 
        i = msr & 0xf;
@@ -2539,7 +2544,7 @@ int set_temperature_target(struct thread_data *t, struct core_data *c, struct pk
        if (!do_nhm_platform_info)
                goto guess;
 
-       if (get_msr(0, MSR_IA32_TEMPERATURE_TARGET, &msr))
+       if (get_msr(base_cpu, MSR_IA32_TEMPERATURE_TARGET, &msr))
                goto guess;
 
        target_c_local = (msr >> 16) & 0xFF;
@@ -2913,13 +2918,24 @@ void setup_all_buffers(void)
        for_all_proc_cpus(initialize_counters);
 }
 
+void set_base_cpu(void)
+{
+       base_cpu = sched_getcpu();
+       if (base_cpu < 0)
+               err(-ENODEV, "No valid cpus found");
+
+       if (debug > 1)
+               fprintf(stderr, "base_cpu = %d\n", base_cpu);
+}
+
 void turbostat_init()
 {
+       setup_all_buffers();
+       set_base_cpu();
        check_dev_msr();
        check_permissions();
        process_cpuid();
 
-       setup_all_buffers();
 
        if (debug)
                for_all_cpus(print_epb, ODD_COUNTERS);