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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173/* 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_USERextern 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(CT_STATE_USER);
}static inline void user_exit(void){ if (context_tracking_enabled()) ct_user_exit(CT_STATE_USER);}
/* Called with interrupts disabled. */static __always_inline void user_enter_irqoff(void){ if (context_tracking_enabled()) __ct_user_enter(CT_STATE_USER);
}static __always_inline void user_exit_irqoff(void){ if (context_tracking_enabled()) __ct_user_exit(CT_STATE_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 != CT_STATE_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 != CT_STATE_KERNEL) ct_user_enter(prev_ctx); }}
static __always_inline bool context_tracking_guest_enter(void){ if (context_tracking_enabled()) __ct_user_enter(CT_STATE_GUEST);
return context_tracking_enabled_this_cpu();}
static __always_inline bool context_tracking_guest_exit(void){ if (context_tracking_enabled()) __ct_user_exit(CT_STATE_GUEST);
return context_tracking_enabled_this_cpu();}
#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
#elsestatic 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 __always_inline bool context_tracking_guest_exit(void) { return false; }#define CT_WARN_ON(cond) do { } while (0)#endif /* !CONFIG_CONTEXT_TRACKING_USER */
#ifdef CONFIG_CONTEXT_TRACKING_USER_FORCEextern void context_tracking_init(void);#elsestatic inline void context_tracking_init(void) { }#endif /* CONFIG_CONTEXT_TRACKING_USER_FORCE */
#ifdef CONFIG_CONTEXT_TRACKING_IDLEextern void ct_idle_enter(void);extern void ct_idle_exit(void);
/* * Is RCU watching the current CPU (IOW, it is not in an extended quiescent state)? * * Note that this returns the actual boolean data (watching / not watching), * whereas ct_rcu_watching() returns the RCU_WATCHING subvariable of * context_tracking.state. * * No ordering, as we are sampling CPU-local information. */static __always_inline bool rcu_is_watching_curr_cpu(void){ return raw_atomic_read(this_cpu_ptr(&context_tracking.state)) & CT_RCU_WATCHING;}
/* * 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 raw_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_is_watching_curr_cpu()) { ret = true; ct_state_inc(CT_RCU_WATCHING); }
return ret;}
static __always_inline void warn_rcu_exit(bool rcu){ if (rcu) ct_state_inc(CT_RCU_WATCHING); preempt_enable_notrace();}
#elsestatic 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