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Date: Fri, 24 May 2019 16:56:02 -0700 From: Fenghua Yu <fenghua.yu@...el.com> To: "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>, "H Peter Anvin" <hpa@...or.com>, "Andy Lutomirski" <luto@...capital.net>, "Andrew Cooper" <andrew.cooper3@...rix.com>, "Ashok Raj" <ashok.raj@...el.com>, "Tony Luck" <tony.luck@...el.com>, "Ravi V Shankar" <ravi.v.shankar@...el.com> Cc: "linux-kernel" <linux-kernel@...r.kernel.org>, "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com> Subject: [PATCH v3 5/5] x86/umwait: Document umwait control sysfs interfaces Since two new sysfs interface files are created for umwait control, add an ABI document entry for the files: /sys/devices/system/cpu/umwait_control/enable_c0_2 /sys/devices/system/cpu/umwait_control/max_time Signed-off-by: Fenghua Yu <fenghua.yu@...el.com> Reviewed-by: Ashok Raj <ashok.raj@...el.com> --- .../ABI/testing/sysfs-devices-system-cpu | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 1528239f69b2..bbf65ae447ff 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -538,3 +538,24 @@ Description: Intel Energy and Performance Bias Hint (EPB) This attribute is present for all online CPUs supporting the Intel EPB feature. + +What: /sys/devices/system/cpu/umwait_control + /sys/devices/system/cpu/umwait_control/enable_c0_2 + /sys/devices/system/cpu/umwait_control/max_time +Date: May 2019 +Contact: Linux kernel mailing list <linux-kernel@...r.kernel.org> +Description: Umwait control + + enable_c0_2: Read/write interface to control umwait C0.2 state + Read returns C0.2 state status: + 0: C0.2 is disabled + 1: C0.2 is enabled + + Write 'Yy1' or [oO][nN] for on to enable C0.2 state. + Write 'Nn0' or [oO][fF] for off to disable C0.2 state. + + max_time: Read/write interface to control umwait maximum time + in TSC-quanta that the CPU can reside in either C0.1 + or C0.2 state. The time is represented as an unsigned + integer decimal value. Bits[1:0] are ignore. + A zero value indicates no maximum time. -- 2.19.1
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