167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
/* 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_USER
|
|
extern void ct_cpu_track_user(int cpu);
|
|
|
|
/* Called with interrupts disabled. */
|
|
extern void __ct_user_enter(enum ctx_state state);
|
|
extern void __ct_user_exit(enum ctx_state state);
|
|
|
|
extern void ct_user_enter(enum ctx_state state);
|
|
extern void ct_user_exit(enum ctx_state state);
|
|
|
|
extern void user_enter_callable(void);
|
|
extern void user_exit_callable(void);
|
|
|
|
static inline void user_enter(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
ct_user_enter(CONTEXT_USER);
|
|
|
|
}
|
|
static inline void user_exit(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
ct_user_exit(CONTEXT_USER);
|
|
}
|
|
|
|
/* Called with interrupts disabled. */
|
|
static __always_inline void user_enter_irqoff(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__ct_user_enter(CONTEXT_USER);
|
|
|
|
}
|
|
static __always_inline void user_exit_irqoff(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__ct_user_exit(CONTEXT_USER);
|
|
}
|
|
|
|
static inline enum ctx_state exception_enter(void)
|
|
{
|
|
enum ctx_state prev_ctx;
|
|
|
|
if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) ||
|
|
!context_tracking_enabled())
|
|
return 0;
|
|
|
|
prev_ctx = __ct_state();
|
|
if (prev_ctx != CONTEXT_KERNEL)
|
|
ct_user_exit(prev_ctx);
|
|
|
|
return prev_ctx;
|
|
}
|
|
|
|
static inline void exception_exit(enum ctx_state prev_ctx)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) &&
|
|
context_tracking_enabled()) {
|
|
if (prev_ctx != CONTEXT_KERNEL)
|
|
ct_user_enter(prev_ctx);
|
|
}
|
|
}
|
|
|
|
static __always_inline bool context_tracking_guest_enter(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__ct_user_enter(CONTEXT_GUEST);
|
|
|
|
return context_tracking_enabled_this_cpu();
|
|
}
|
|
|
|
static __always_inline void context_tracking_guest_exit(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__ct_user_exit(CONTEXT_GUEST);
|
|
}
|
|
|
|
#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
|
|
|
|
#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 int exception_enter(void) { return 0; }
|
|
static inline void exception_exit(enum ctx_state prev_ctx) { }
|
|
static inline int ct_state(void) { return -1; }
|
|
static inline int __ct_state(void) { return -1; }
|
|
static __always_inline bool context_tracking_guest_enter(void) { return false; }
|
|
static inline void context_tracking_guest_exit(void) { }
|
|
#define CT_WARN_ON(cond) do { } while (0)
|
|
#endif /* !CONFIG_CONTEXT_TRACKING_USER */
|
|
|
|
#ifdef CONFIG_CONTEXT_TRACKING_USER_FORCE
|
|
extern void context_tracking_init(void);
|
|
#else
|
|
static inline void context_tracking_init(void) { }
|
|
#endif /* CONFIG_CONTEXT_TRACKING_USER_FORCE */
|
|
|
|
#ifdef CONFIG_CONTEXT_TRACKING_IDLE
|
|
extern void ct_idle_enter(void);
|
|
extern void ct_idle_exit(void);
|
|
|
|
/*
|
|
* Is the current CPU in an extended quiescent state?
|
|
*
|
|
* No ordering, as we are sampling CPU-local information.
|
|
*/
|
|
static __always_inline bool rcu_dynticks_curr_cpu_in_eqs(void)
|
|
{
|
|
return !(arch_atomic_read(this_cpu_ptr(&context_tracking.state)) & RCU_DYNTICKS_IDX);
|
|
}
|
|
|
|
/*
|
|
* Increment the current CPU's context_tracking structure's ->state field
|
|
* with ordering. Return the new value.
|
|
*/
|
|
static __always_inline unsigned long ct_state_inc(int incby)
|
|
{
|
|
return arch_atomic_add_return(incby, this_cpu_ptr(&context_tracking.state));
|
|
}
|
|
|
|
static __always_inline bool warn_rcu_enter(void)
|
|
{
|
|
bool ret = false;
|
|
|
|
/*
|
|
* Horrible hack to shut up recursive RCU isn't watching fail since
|
|
* lots of the actual reporting also relies on RCU.
|
|
*/
|
|
preempt_disable_notrace();
|
|
if (rcu_dynticks_curr_cpu_in_eqs()) {
|
|
ret = true;
|
|
ct_state_inc(RCU_DYNTICKS_IDX);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static __always_inline void warn_rcu_exit(bool rcu)
|
|
{
|
|
if (rcu)
|
|
ct_state_inc(RCU_DYNTICKS_IDX);
|
|
preempt_enable_notrace();
|
|
}
|
|
|
|
#else
|
|
static inline void ct_idle_enter(void) { }
|
|
static inline void ct_idle_exit(void) { }
|
|
|
|
static __always_inline bool warn_rcu_enter(void) { return false; }
|
|
static __always_inline void warn_rcu_exit(bool rcu) { }
|
|
#endif /* !CONFIG_CONTEXT_TRACKING_IDLE */
|
|
|
|
#endif
|