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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H

#include <linux/sched.h>
#include <linux/vtime.h>
#include <linux/context_tracking_state.h>
#include <linux/instrumentation.h>

#include <asm/ptrace.h>


#ifdef CONFIG_CONTEXT_TRACKING
extern void context_tracking_cpu_set(int cpu);

/* Called with interrupts disabled.  */
extern void __context_tracking_enter(enum ctx_state state);
extern void __context_tracking_exit(enum ctx_state state);

extern void context_tracking_enter(enum ctx_state state);
extern void context_tracking_exit(enum ctx_state state);
extern void context_tracking_user_enter(void);
extern void context_tracking_user_exit(void);

static inline void user_enter(void)
{
    if (context_tracking_enabled())
        context_tracking_enter(CONTEXT_USER);

}
static inline void user_exit(void)
{
    if (context_tracking_enabled())
        context_tracking_exit(CONTEXT_USER);
}

/* Called with interrupts disabled.  */
static __always_inline void user_enter_irqoff(void)
{
    if (context_tracking_enabled())
        __context_tracking_enter(CONTEXT_USER);

}
static __always_inline void user_exit_irqoff(void)
{
    if (context_tracking_enabled())
        __context_tracking_exit(CONTEXT_USER);
}

static inline enum ctx_state exception_enter(void)
{
    enum ctx_state prev_ctx;

    if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) ||
        !context_tracking_enabled())
        return 0;

    prev_ctx = this_cpu_read(context_tracking.state);
    if (prev_ctx != CONTEXT_KERNEL)
        context_tracking_exit(prev_ctx);

    return prev_ctx;
}

static inline void exception_exit(enum ctx_state prev_ctx)
{
    if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK) &&
        context_tracking_enabled()) {
        if (prev_ctx != CONTEXT_KERNEL)
            context_tracking_enter(prev_ctx);
    }
}

static __always_inline bool context_tracking_guest_enter(void)
{
    if (context_tracking_enabled())
        __context_tracking_enter(CONTEXT_GUEST);

    return context_tracking_enabled_this_cpu();
}

static __always_inline void context_tracking_guest_exit(void)
{
    if (context_tracking_enabled())
        __context_tracking_exit(CONTEXT_GUEST);
}

/**
 * ct_state() - return the current context tracking state if known
 *
 * Returns the current cpu's context tracking state if context tracking
 * is enabled.  If context tracking is disabled, returns
 * CONTEXT_DISABLED.  This should be used primarily for debugging.
 */
static __always_inline enum ctx_state ct_state(void)
{
    return context_tracking_enabled() ?
        this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
}
#else
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline void user_enter_irqoff(void) { }
static inline void user_exit_irqoff(void) { }
static inline enum ctx_state exception_enter(void) { return 0; }
static inline void exception_exit(enum ctx_state prev_ctx) { }
static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
static inline bool context_tracking_guest_enter(void) { return false; }
static inline void context_tracking_guest_exit(void) { }

#endif /* !CONFIG_CONTEXT_TRACKING */

#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))

#ifdef CONFIG_CONTEXT_TRACKING_FORCE
extern void context_tracking_init(void);
#else
static inline void context_tracking_init(void) { }
#endif /* CONFIG_CONTEXT_TRACKING_FORCE */

#endif

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