1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /**
3*4882a593Smuzhiyun * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun #ifndef MINMAX_H
7*4882a593Smuzhiyun #define MINMAX_H
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/types.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun /* A single data point for our parameterized min-max tracker */
12*4882a593Smuzhiyun struct minmax_sample {
13*4882a593Smuzhiyun u32 t; /* time measurement was taken */
14*4882a593Smuzhiyun u32 v; /* value measured */
15*4882a593Smuzhiyun };
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* State for the parameterized min-max tracker */
18*4882a593Smuzhiyun struct minmax {
19*4882a593Smuzhiyun struct minmax_sample s[3];
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
minmax_get(const struct minmax * m)22*4882a593Smuzhiyun static inline u32 minmax_get(const struct minmax *m)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun return m->s[0].v;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
minmax_reset(struct minmax * m,u32 t,u32 meas)27*4882a593Smuzhiyun static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct minmax_sample val = { .t = t, .v = meas };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun m->s[2] = m->s[1] = m->s[0] = val;
32*4882a593Smuzhiyun return m->s[0].v;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
36*4882a593Smuzhiyun u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun #endif
39