From: Christopher Hall <christopher.s.hall@intel.com>
To: john.stultz@linaro.org, tglx@linutronix.de,
richardcochran@gmail.com, mingo@redhat.com,
jeffrey.t.kirsher@intel.com, john.ronciak@intel.com,
hpa@zytor.com, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Christopher Hall <christopher.s.hall@intel.com>
Subject: [PATCH 2/5] Added functions mapping TSC value to system time
Date: Mon, 27 Jul 2015 17:46:53 -0700 [thread overview]
Message-ID: <1438044416-15588-3-git-send-email-christopher.s.hall@intel.com> (raw)
In-Reply-To: <1438044416-15588-1-git-send-email-christopher.s.hall@intel.com>
* tsc_to_rawmono64
* tsc_to_realtime64
* tsc_to_mono64
These function build on the counter_to_* time translation function
specifically for TSC based system clock
Signed-off-by: Christopher Hall <christopher.s.hall@intel.com>
---
arch/x86/include/asm/tsc.h | 5 +++++
arch/x86/kernel/tsc.c | 18 ++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 94605c0..3fdf8b1 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -5,6 +5,7 @@
#define _ASM_X86_TSC_H
#include <asm/processor.h>
+#include <linux/time64.h>
#define NS_SCALE 10 /* 2^10, carefully chosen */
#define US_SCALE 32 /* 2^32, arbitralrily chosen */
@@ -52,6 +53,10 @@ extern int check_tsc_unstable(void);
extern int check_tsc_disabled(void);
extern unsigned long native_calibrate_tsc(void);
+extern int tsc_to_rawmono64(struct timespec64 *rawmono, cycle_t counterval);
+extern int tsc_to_realtime64(struct timespec64 *realtime, cycle_t counterval);
+extern int tsc_to_mono64(struct timespec64 *mono, cycle_t counterval);
+
extern int tsc_clocksource_reliable;
/*
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 7437b41..a192271 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -979,6 +979,24 @@ static cycle_t read_tsc(struct clocksource *cs)
return (cycle_t)get_cycles();
}
+int tsc_to_rawmono64(struct timespec64 *rawmono, cycle_t counterval)
+{
+ return counter_to_rawmono64(rawmono, counterval, &clocksource_tsc);
+}
+EXPORT_SYMBOL(tsc_to_rawmono64);
+
+int tsc_to_realtime64(struct timespec64 *realtime, cycle_t counterval)
+{
+ return counter_to_realtime64(realtime, counterval, &clocksource_tsc);
+}
+EXPORT_SYMBOL(tsc_to_realtime64);
+
+int tsc_to_mono64(struct timespec64 *mono, cycle_t counterval)
+{
+ return counter_to_mono64(mono, counterval, &clocksource_tsc);
+}
+EXPORT_SYMBOL(tsc_to_mono64);
+
/*
* .mask MUST be CLOCKSOURCE_MASK(64). See comment above read_tsc()
*/
--
1.9.1
next prev parent reply other threads:[~2015-07-28 0:46 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 0:46 [PATCH 0/5] Patchset enabling hardware based cross-timestamps for next gen Intel platforms Christopher Hall
2015-07-28 0:46 ` [PATCH 1/5] Add functions producing system time given a backing counter value Christopher Hall
2015-07-28 3:44 ` John Stultz
2015-07-28 4:05 ` John Stultz
2015-07-29 10:19 ` Thomas Gleixner
2015-07-29 10:23 ` Thomas Gleixner
2015-07-29 10:51 ` Peter Zijlstra
2015-07-29 12:30 ` Richard Cochran
2015-07-29 10:49 ` Peter Zijlstra
2015-07-29 11:48 ` Richard Cochran
2015-07-29 12:35 ` Peter Zijlstra
2015-07-29 12:52 ` Thomas Gleixner
2015-07-29 1:41 ` Hall, Christopher S
2015-07-29 14:05 ` Thomas Gleixner
2015-07-28 0:46 ` Christopher Hall [this message]
2015-07-28 0:46 ` [PATCH 3/5] Add calls to translate Always Running Timer (ART) to system time Christopher Hall
2015-07-28 1:32 ` Andy Lutomirski
2015-07-29 1:18 ` Hall, Christopher S
2015-07-29 1:47 ` Andy Lutomirski
2015-07-28 4:11 ` John Stultz
2015-07-29 2:05 ` Hall, Christopher S
2015-07-29 8:25 ` Paul Bolle
2015-07-28 0:46 ` [PATCH 4/5] Add support for driver cross-timestamp to PTP_SYS_OFFSET ioctl Christopher Hall
2015-07-28 0:46 ` [PATCH 5/5] Enables cross timestamping in the e1000e driver Christopher Hall
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