139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_CONTEXT_TRACKING_H
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#define _LINUX_CONTEXT_TRACKING_H
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#include <linux/sched.h>
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#include <linux/vtime.h>
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#include <linux/context_tracking_state.h>
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#include <linux/instrumentation.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_CONTEXT_TRACKING_USER
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extern void ct_cpu_track_user(int cpu);
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/* Called with interrupts disabled. */
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extern void __ct_user_enter(enum ctx_state state);
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extern void __ct_user_exit(enum ctx_state state);
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extern void ct_user_enter(enum ctx_state state);
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extern void ct_user_exit(enum ctx_state state);
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extern void user_enter_callable(void);
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extern void user_exit_callable(void);
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static inline void user_enter(void)
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{
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if (context_tracking_enabled())
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ct_user_enter(CONTEXT_USER);
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}
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static inline void user_exit(void)
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{
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if (context_tracking_enabled())
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ct_user_exit(CONTEXT_USER);
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}
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/* Called with interrupts disabled. */
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static __always_inline void user_enter_irqoff(void)
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{
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if (context_tracking_enabled())
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__ct_user_enter(CONTEXT_USER);
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}
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static __always_inline void user_exit_irqoff(void)
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{
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if (context_tracking_enabled())
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__ct_user_exit(CONTEXT_USER);
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}
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static inline enum ctx_state exception_enter(void)
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{
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enum ctx_state prev_ctx;
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if (IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) ||
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!context_tracking_enabled())
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return 0;
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prev_ctx = __ct_state();
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if (prev_ctx != CONTEXT_KERNEL)
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ct_user_exit(prev_ctx);
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return prev_ctx;
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}
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static inline void exception_exit(enum ctx_state prev_ctx)
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{
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if (!IS_ENABLED(CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK) &&
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context_tracking_enabled()) {
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if (prev_ctx != CONTEXT_KERNEL)
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ct_user_enter(prev_ctx);
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}
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}
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static __always_inline bool context_tracking_guest_enter(void)
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{
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if (context_tracking_enabled())
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__ct_user_enter(CONTEXT_GUEST);
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return context_tracking_enabled_this_cpu();
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}
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static __always_inline void context_tracking_guest_exit(void)
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{
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if (context_tracking_enabled())
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__ct_user_exit(CONTEXT_GUEST);
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}
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#define CT_WARN_ON(cond) WARN_ON(context_tracking_enabled() && (cond))
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#else
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static inline void user_enter(void) { }
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static inline void user_exit(void) { }
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static inline void user_enter_irqoff(void) { }
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static inline void user_exit_irqoff(void) { }
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static inline int exception_enter(void) { return 0; }
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static inline void exception_exit(enum ctx_state prev_ctx) { }
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static inline int ct_state(void) { return -1; }
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static __always_inline bool context_tracking_guest_enter(void) { return false; }
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static inline void context_tracking_guest_exit(void) { }
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#define CT_WARN_ON(cond) do { } while (0)
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#endif /* !CONFIG_CONTEXT_TRACKING_USER */
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#ifdef CONFIG_CONTEXT_TRACKING_USER_FORCE
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extern void context_tracking_init(void);
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#else
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static inline void context_tracking_init(void) { }
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#endif /* CONFIG_CONTEXT_TRACKING_USER_FORCE */
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#ifdef CONFIG_CONTEXT_TRACKING_IDLE
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extern void ct_idle_enter(void);
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extern void ct_idle_exit(void);
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/*
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* Is the current CPU in an extended quiescent state?
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*
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* No ordering, as we are sampling CPU-local information.
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*/
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static __always_inline bool rcu_dynticks_curr_cpu_in_eqs(void)
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{
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return !(arch_atomic_read(this_cpu_ptr(&context_tracking.state)) & RCU_DYNTICKS_IDX);
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}
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/*
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* Increment the current CPU's context_tracking structure's ->state field
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* with ordering. Return the new value.
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*/
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static __always_inline unsigned long ct_state_inc(int incby)
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{
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return arch_atomic_add_return(incby, this_cpu_ptr(&context_tracking.state));
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}
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#else
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static inline void ct_idle_enter(void) { }
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static inline void ct_idle_exit(void) { }
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#endif /* !CONFIG_CONTEXT_TRACKING_IDLE */
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#endif
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