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Message-Id: <20230123182728.825519-3-kan.liang@linux.intel.com>
Date: Mon, 23 Jan 2023 10:27:27 -0800
From: kan.liang@...ux.intel.com
To: peterz@...radead.org, mingo@...hat.com, tglx@...utronix.de,
jstultz@...gle.com, sboyd@...nel.org, linux-kernel@...r.kernel.org
Cc: eranian@...gle.com, namhyung@...nel.org, ak@...ux.intel.com,
Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/3] x86/tsc: Add set_tsc_system_counterval
From: Kan Liang <kan.liang@...ux.intel.com>
The perf_event subsystem wants to convert a TSC of a PEBS record to a
monotonic clock. Introduce a new function to provide both the TSC
value and TSC clocksource information with the format required by the
callback function from the timekeeping code.
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
arch/x86/include/asm/tsc.h | 1 +
arch/x86/kernel/tsc.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index fbdc3d951494..45aac88b5ce4 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -29,6 +29,7 @@ static inline cycles_t get_cycles(void)
extern struct system_counterval_t convert_art_to_tsc(u64 art);
extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns);
+extern struct system_counterval_t set_tsc_system_counterval(u64 tsc);
extern void tsc_early_init(void);
extern void tsc_init(void);
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index a78e73da4a74..45803e65630e 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1311,6 +1311,12 @@ struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns)
}
EXPORT_SYMBOL(convert_art_ns_to_tsc);
+struct system_counterval_t set_tsc_system_counterval(u64 tsc)
+{
+ return (struct system_counterval_t) { .cs = &clocksource_tsc,
+ .cycles = tsc};
+}
+EXPORT_SYMBOL(set_tsc_system_counterval);
static void tsc_refine_calibration_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(tsc_irqwork, tsc_refine_calibration_work);
--
2.35.1
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