cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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windfarm.h (4166B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Windfarm PowerMac thermal control.
      4 *
      5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
      6 *                    <benh@kernel.crashing.org>
      7 */
      8
      9#ifndef __WINDFARM_H__
     10#define __WINDFARM_H__
     11
     12#include <linux/kref.h>
     13#include <linux/list.h>
     14#include <linux/module.h>
     15#include <linux/notifier.h>
     16#include <linux/device.h>
     17
     18/* Display a 16.16 fixed point value */
     19#define FIX32TOPRINT(f)	(((s32)(f)) >> 16),(((((s32)(f)) & 0xffff) * 1000) >> 16)
     20
     21/*
     22 * Control objects
     23 */
     24
     25struct wf_control;
     26
     27struct wf_control_ops {
     28	int			(*set_value)(struct wf_control *ct, s32 val);
     29	int			(*get_value)(struct wf_control *ct, s32 *val);
     30	s32			(*get_min)(struct wf_control *ct);
     31	s32			(*get_max)(struct wf_control *ct);
     32	void			(*release)(struct wf_control *ct);
     33	struct module		*owner;
     34};
     35
     36struct wf_control {
     37	struct list_head		link;
     38	const struct wf_control_ops	*ops;
     39	const char			*name;
     40	int				type;
     41	struct kref			ref;
     42	struct device_attribute		attr;
     43	void				*priv;
     44};
     45
     46#define WF_CONTROL_TYPE_GENERIC		0
     47#define WF_CONTROL_RPM_FAN		1
     48#define WF_CONTROL_PWM_FAN		2
     49
     50
     51/* Note about lifetime rules: wf_register_control() will initialize
     52 * the kref and wf_unregister_control will decrement it, thus the
     53 * object creating/disposing a given control shouldn't assume it
     54 * still exists after wf_unregister_control has been called.
     55 */
     56extern int wf_register_control(struct wf_control *ct);
     57extern void wf_unregister_control(struct wf_control *ct);
     58extern int wf_get_control(struct wf_control *ct);
     59extern void wf_put_control(struct wf_control *ct);
     60
     61static inline int wf_control_set_max(struct wf_control *ct)
     62{
     63	s32 vmax = ct->ops->get_max(ct);
     64	return ct->ops->set_value(ct, vmax);
     65}
     66
     67static inline int wf_control_set_min(struct wf_control *ct)
     68{
     69	s32 vmin = ct->ops->get_min(ct);
     70	return ct->ops->set_value(ct, vmin);
     71}
     72
     73static inline int wf_control_set(struct wf_control *ct, s32 val)
     74{
     75	return ct->ops->set_value(ct, val);
     76}
     77
     78static inline int wf_control_get(struct wf_control *ct, s32 *val)
     79{
     80	return ct->ops->get_value(ct, val);
     81}
     82
     83static inline s32 wf_control_get_min(struct wf_control *ct)
     84{
     85	return ct->ops->get_min(ct);
     86}
     87
     88static inline s32 wf_control_get_max(struct wf_control *ct)
     89{
     90	return ct->ops->get_max(ct);
     91}
     92
     93/*
     94 * Sensor objects
     95 */
     96
     97struct wf_sensor;
     98
     99struct wf_sensor_ops {
    100	int			(*get_value)(struct wf_sensor *sr, s32 *val);
    101	void			(*release)(struct wf_sensor *sr);
    102	struct module		*owner;
    103};
    104
    105struct wf_sensor {
    106	struct list_head		link;
    107	const struct wf_sensor_ops	*ops;
    108	const char			*name;
    109	struct kref			ref;
    110	struct device_attribute		attr;
    111	void				*priv;
    112};
    113
    114/* Same lifetime rules as controls */
    115extern int wf_register_sensor(struct wf_sensor *sr);
    116extern void wf_unregister_sensor(struct wf_sensor *sr);
    117extern int wf_get_sensor(struct wf_sensor *sr);
    118extern void wf_put_sensor(struct wf_sensor *sr);
    119
    120static inline int wf_sensor_get(struct wf_sensor *sr, s32 *val)
    121{
    122	return sr->ops->get_value(sr, val);
    123}
    124
    125/* For use by clients. Note that we are a bit racy here since
    126 * notifier_block doesn't have a module owner field. I may fix
    127 * it one day ...
    128 *
    129 * LOCKING NOTE !
    130 *
    131 * All "events" except WF_EVENT_TICK are called with an internal mutex
    132 * held which will deadlock if you call basically any core routine.
    133 * So don't ! Just take note of the event and do your actual operations
    134 * from the ticker.
    135 *
    136 */
    137extern int wf_register_client(struct notifier_block *nb);
    138extern int wf_unregister_client(struct notifier_block *nb);
    139
    140/* Overtemp conditions. Those are refcounted */
    141extern void wf_set_overtemp(void);
    142extern void wf_clear_overtemp(void);
    143
    144#define WF_EVENT_NEW_CONTROL	0 /* param is wf_control * */
    145#define WF_EVENT_NEW_SENSOR	1 /* param is wf_sensor * */
    146#define WF_EVENT_OVERTEMP	2 /* no param */
    147#define WF_EVENT_NORMALTEMP	3 /* overtemp condition cleared */
    148#define WF_EVENT_TICK		4 /* 1 second tick */
    149
    150/* Note: If that driver gets more broad use, we could replace the
    151 * simplistic overtemp bits with "environmental conditions". That
    152 * could then be used to also notify of things like fan failure,
    153 * case open, battery conditions, ...
    154 */
    155
    156#endif /* __WINDFARM_H__ */