Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com> --- arch/x86/include/asm/tsc.h | 2 ++ arch/x86/kernel/tsc.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h index 8a0c25c6bf09..b7a9f4385a82 100644 --- a/arch/x86/include/asm/tsc.h +++ b/arch/x86/include/asm/tsc.h @@ -32,6 +32,8 @@ 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 void get_tsc_ns(struct system_counterval_t *tsc_counterval, u64 *tsc_ns); +extern u64 get_art_ns_now(void); 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 0b29e58f288e..333fffc1db7c 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1215,6 +1215,38 @@ struct system_counterval_t convert_art_to_tsc(u64 art) } EXPORT_SYMBOL(convert_art_to_tsc); +void get_tsc_ns(struct system_counterval_t *tsc_counterval, u64 *tsc_ns) +{ + u64 tmp, res, rem; + u64 cycles; + + tsc_counterval->cycles = clocksource_tsc.read(NULL); + cycles = tsc_counterval->cycles; + tsc_counterval->cs = art_related_clocksource; + + rem = do_div(cycles, tsc_khz); + + res = cycles * USEC_PER_SEC; + tmp = rem * USEC_PER_SEC; + + do_div(tmp, tsc_khz); + res += tmp; + + *tsc_ns = res; +} +EXPORT_SYMBOL(get_tsc_ns); + +u64 get_art_ns_now(void) +{ + struct system_counterval_t tsc_cycles; + u64 tsc_ns; + + get_tsc_ns(&tsc_cycles, &tsc_ns); + + return tsc_ns; +} +EXPORT_SYMBOL(get_art_ns_now); + /** * convert_art_ns_to_tsc() - Convert ART in nanoseconds to TSC. * @art_ns: ART (Always Running Timer) in unit of nanoseconds -- 2.22.0