1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PERF_TSC_H
3 #define __PERF_TSC_H
4
5 #include <linux/types.h>
6
7 struct perf_tsc_conversion {
8 u16 time_shift;
9 u32 time_mult;
10 u64 time_zero;
11 };
12
13 struct perf_event_mmap_page;
14
15 int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
16 struct perf_tsc_conversion *tc);
17
18 u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc);
19 u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc);
20 u64 rdtsc(void);
21
22 #endif // __PERF_TSC_H