diff options
Diffstat (limited to 'arch/x86/kernel/tsc.c')
-rw-r--r-- | arch/x86/kernel/tsc.c | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index ad2b925..8ea117f 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -112,7 +112,7 @@ static void cyc2ns_data_init(struct cyc2ns_data *data) data->cyc2ns_offset = 0; } -static void cyc2ns_init(int cpu) +static void __init cyc2ns_init(int cpu) { struct cyc2ns *c2n = &per_cpu(cyc2ns, cpu); @@ -812,13 +812,13 @@ unsigned long native_calibrate_cpu(void) return tsc_pit_min; } -int recalibrate_cpu_khz(void) +void recalibrate_cpu_khz(void) { #ifndef CONFIG_SMP unsigned long cpu_khz_old = cpu_khz; if (!boot_cpu_has(X86_FEATURE_TSC)) - return -ENODEV; + return; cpu_khz = x86_platform.calibrate_cpu(); tsc_khz = x86_platform.calibrate_tsc(); @@ -828,10 +828,6 @@ int recalibrate_cpu_khz(void) cpu_khz = tsc_khz; cpu_data(0).loops_per_jiffy = cpufreq_scale(cpu_data(0).loops_per_jiffy, cpu_khz_old, cpu_khz); - - return 0; -#else - return -ENODEV; #endif } @@ -959,17 +955,21 @@ core_initcall(cpufreq_register_tsc_scaling); /* * If ART is present detect the numerator:denominator to convert to TSC */ -static void detect_art(void) +static void __init detect_art(void) { unsigned int unused[2]; if (boot_cpu_data.cpuid_level < ART_CPUID_LEAF) return; - /* Don't enable ART in a VM, non-stop TSC and TSC_ADJUST required */ + /* + * Don't enable ART in a VM, non-stop TSC and TSC_ADJUST required, + * and the TSC counter resets must not occur asynchronously. + */ if (boot_cpu_has(X86_FEATURE_HYPERVISOR) || !boot_cpu_has(X86_FEATURE_NONSTOP_TSC) || - !boot_cpu_has(X86_FEATURE_TSC_ADJUST)) + !boot_cpu_has(X86_FEATURE_TSC_ADJUST) || + tsc_async_resets) return; cpuid(ART_CPUID_LEAF, &art_to_tsc_denominator, @@ -1263,6 +1263,25 @@ static int __init init_tsc_clocksource(void) */ device_initcall(init_tsc_clocksource); +void __init tsc_early_delay_calibrate(void) +{ + unsigned long lpj; + + if (!boot_cpu_has(X86_FEATURE_TSC)) + return; + + cpu_khz = x86_platform.calibrate_cpu(); + tsc_khz = x86_platform.calibrate_tsc(); + + tsc_khz = tsc_khz ? : cpu_khz; + if (!tsc_khz) + return; + + lpj = tsc_khz * 1000; + do_div(lpj, HZ); + loops_per_jiffy = lpj; +} + void __init tsc_init(void) { u64 lpj, cyc; |