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