c467ea763f
Current context tracking symbols are designed to express living state. As such they are prefixed with "IN_": IN_USER, IN_KERNEL. Now we are going to use these symbols to also express state transitions such as context_tracking_enter(IN_USER) or context_tracking_exit(IN_USER). But while the "IN_" prefix works well to express entering a context, it's confusing to depict a context exit: context_tracking_exit(IN_USER) could mean two things: 1) We are exiting the current context to enter user context. 2) We are exiting the user context We want 2) but the reviewer may be confused and understand 1) So lets disambiguate these symbols and rename them to CONTEXT_USER and CONTEXT_KERNEL. Acked-by: Rik van Riel <riel@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Will deacon <will.deacon@arm.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
#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 <asm/ptrace.h>
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#ifdef CONFIG_CONTEXT_TRACKING
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extern void context_tracking_cpu_set(int cpu);
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extern void context_tracking_user_enter(void);
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extern void context_tracking_user_exit(void);
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extern void __context_tracking_task_switch(struct task_struct *prev,
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struct task_struct *next);
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static inline void user_enter(void)
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{
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if (context_tracking_is_enabled())
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context_tracking_user_enter();
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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_is_enabled())
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context_tracking_user_exit();
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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 (!context_tracking_is_enabled())
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return 0;
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prev_ctx = this_cpu_read(context_tracking.state);
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context_tracking_user_exit();
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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 (context_tracking_is_enabled()) {
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if (prev_ctx == CONTEXT_USER)
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context_tracking_user_enter();
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}
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}
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static inline void context_tracking_task_switch(struct task_struct *prev,
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struct task_struct *next)
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{
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if (context_tracking_is_enabled())
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__context_tracking_task_switch(prev, next);
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}
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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 enum ctx_state 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 void context_tracking_task_switch(struct task_struct *prev,
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struct task_struct *next) { }
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#endif /* !CONFIG_CONTEXT_TRACKING */
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#ifdef CONFIG_CONTEXT_TRACKING_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_FORCE */
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
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static inline void guest_enter(void)
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{
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if (vtime_accounting_enabled())
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vtime_guest_enter(current);
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else
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current->flags |= PF_VCPU;
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}
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static inline void guest_exit(void)
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{
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if (vtime_accounting_enabled())
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vtime_guest_exit(current);
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else
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current->flags &= ~PF_VCPU;
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}
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#else
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static inline void guest_enter(void)
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{
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/*
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* This is running in ioctl context so its safe
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* to assume that it's the stime pending cputime
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* to flush.
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*/
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vtime_account_system(current);
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current->flags |= PF_VCPU;
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}
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static inline void guest_exit(void)
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{
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/* Flush the guest cputime we spent on the guest */
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vtime_account_system(current);
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current->flags &= ~PF_VCPU;
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}
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
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#endif
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