[mirror_ubuntu-bionic-kernel.git] / include / linux / win_minmax.h

/* SPDX-License-Identifier: GPL-2.0 */
/**
 * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
 *
 */
#ifndef MINMAX_H
#define MINMAX_H

#include <linux/types.h>

/* A single data point for our parameterized min-max tracker */
struct minmax_sample {
	u32	t;	/* time measurement was taken */
	u32	v;	/* value measured */
};

/* State for the parameterized min-max tracker */
struct minmax {
	struct minmax_sample s[3];
};

static inline u32 minmax_get(const struct minmax *m)
{
	return m->s[0].v;
}

static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
{
	struct minmax_sample val = { .t = t, .v = meas };

	m->s[2] = m->s[1] = m->s[0] = val;
	return m->s[0].v;
}

u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
a4f1f9ac NC	2	/**
	3	* lib/minmax.c: 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