linux-kernel - [PATCH 3/3] x86/vdso: Add support for CLOCK_MONOTONIC

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Date:   Thu, 11 Apr 2019 11:12:05 +0100
From:   Huw Davies <huw@...eweavers.com>
To:     linux kernel <linux-kernel@...r.kernel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 3/3] x86/vdso: Add support for CLOCK_MONOTONIC_RAW in the vDSO

This is particularly useful for Wine which needs to implement Win32
API clock functions whose values do not get adjusted by adjtimex().

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Huw Davies <huw@...eweavers.com>
---
 arch/x86/entry/vsyscall/vsyscall_gtod.c | 6 ++++++
 arch/x86/include/asm/vgtod.h            | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/vsyscall/vsyscall_gtod.c b/arch/x86/entry/vsyscall/vsyscall_gtod.c
index ddc6a71df87c..fe3458caf301 100644
--- a/arch/x86/entry/vsyscall/vsyscall_gtod.c
+++ b/arch/x86/entry/vsyscall/vsyscall_gtod.c
@@ -68,6 +68,12 @@ void update_vsyscall(struct timekeeper *tk)
 	base->mult = tk->tkr_mono.mult;
 	base->shift = tk->tkr_mono.shift;
 
+	base = &vdata->basetime[CLOCK_MONOTONIC_RAW];
+	base->sec = tk->raw_sec;
+	base->nsec = tk->tkr_raw.xtime_nsec;
+	base->mult = tk->tkr_raw.mult;
+	base->shift = tk->tkr_raw.shift;
+
 	base = &vdata->basetime[CLOCK_REALTIME_COARSE];
 	base->sec = tk->xtime_sec;
 	base->nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index ae0d76491595..0b76ba884e25 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -30,7 +30,8 @@ struct vgtod_ts {
 };
 
 #define VGTOD_BASES	(CLOCK_TAI + 1)
-#define VGTOD_HRES	(BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | BIT(CLOCK_TAI))
+#define VGTOD_HRES	(BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | \
+			BIT(CLOCK_MONOTONIC_RAW) | BIT(CLOCK_TAI))
 #define VGTOD_COARSE	(BIT(CLOCK_REALTIME_COARSE) | BIT(CLOCK_MONOTONIC_COARSE))
 
 /*
-- 
2.17.1