1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h>
3 #include <linux/types.h>
7 u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc)
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;
18 u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc)
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);
28 u64 __weak rdtsc(void)