1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/compiler.h>
 3#include <linux/types.h>
 4
 5#include "tsc.h"
 6
 7u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc)
 8{
 9	u64 t, quot, rem;
10
11	t = ns - tc->time_zero;
12	quot = t / tc->time_mult;
13	rem  = t % tc->time_mult;
14	return (quot << tc->time_shift) +
15	       (rem << tc->time_shift) / tc->time_mult;
16}
17
18u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc)
19{
20	u64 quot, rem;
21
22	quot = cyc >> tc->time_shift;
23	rem  = cyc & (((u64)1 << tc->time_shift) - 1);
24	return tc->time_zero + quot * tc->time_mult +
25	       ((rem * tc->time_mult) >> tc->time_shift);
26}
27
28u64 __weak rdtsc(void)
29{
30	return 0;
31}

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/compiler.h>
 3#include <linux/types.h>
 4
 5#include "tsc.h"
 6
 7u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc)
 8{
 9	u64 t, quot, rem;
10
11	t = ns - tc->time_zero;
12	quot = t / tc->time_mult;
13	rem  = t % tc->time_mult;
14	return (quot << tc->time_shift) +
15	       (rem << tc->time_shift) / tc->time_mult;
16}
17
18u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc)
19{
20	u64 quot, rem;
21
22	quot = cyc >> tc->time_shift;
23	rem  = cyc & (((u64)1 << tc->time_shift) - 1);
24	return tc->time_zero + quot * tc->time_mult +
25	       ((rem * tc->time_mult) >> tc->time_shift);
26}
27
28u64 __weak rdtsc(void)
29{
30	return 0;
31}