mirror of https://gitee.com/openkylin/linux.git
x86: c1e_idle: don't mark TSC unstable if CPU has invariant TSC
Impact: Functional TSC is marked unstable on AMD family 0x10 and 0x11 CPUs. This would be wrong because for those CPUs "invariant TSC" means: "The TSC counts at the same rate in all P-states, all C states, S0, or S1" (See "Processor BIOS and Kernel Developer's Guides" for those CPUs.) [ tglx: Changed C1E to AMD C1E in the printks to avoid confusion with Intel C1E ] Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -270,8 +270,9 @@ static void c1e_idle(void)
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rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
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rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
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if (lo & K8_INTP_C1E_ACTIVE_MASK) {
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if (lo & K8_INTP_C1E_ACTIVE_MASK) {
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c1e_detected = 1;
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c1e_detected = 1;
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mark_tsc_unstable("TSC halt in C1E");
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if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
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printk(KERN_INFO "System has C1E enabled\n");
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mark_tsc_unstable("TSC halt in AMD C1E");
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printk(KERN_INFO "System has AMD C1E enabled\n");
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set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
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set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
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}
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}
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}
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}
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