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context_tracking.h
/* 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