forked from mirrors/linux
ba1f2b2eaa
While the nmi_enter() users did
trace_hardirqs_{off_prepare,on_finish}() there was no matching
lockdep_hardirqs_*() calls to complete the picture.
Introduce idtentry_{enter,exit}_nmi() to enable proper IRQ state
tracking across the NMIs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200623083721.216740948@infradead.org
152 lines
3.5 KiB
C
152 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef LINUX_HARDIRQ_H
|
|
#define LINUX_HARDIRQ_H
|
|
|
|
#include <linux/context_tracking_state.h>
|
|
#include <linux/preempt.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/ftrace_irq.h>
|
|
#include <linux/vtime.h>
|
|
#include <asm/hardirq.h>
|
|
|
|
extern void synchronize_irq(unsigned int irq);
|
|
extern bool synchronize_hardirq(unsigned int irq);
|
|
|
|
#ifdef CONFIG_NO_HZ_FULL
|
|
void __rcu_irq_enter_check_tick(void);
|
|
#else
|
|
static inline void __rcu_irq_enter_check_tick(void) { }
|
|
#endif
|
|
|
|
static __always_inline void rcu_irq_enter_check_tick(void)
|
|
{
|
|
if (context_tracking_enabled())
|
|
__rcu_irq_enter_check_tick();
|
|
}
|
|
|
|
/*
|
|
* It is safe to do non-atomic ops on ->hardirq_context,
|
|
* because NMI handlers may not preempt and the ops are
|
|
* always balanced, so the interrupted value of ->hardirq_context
|
|
* will always be restored.
|
|
*/
|
|
#define __irq_enter() \
|
|
do { \
|
|
account_irq_enter_time(current); \
|
|
preempt_count_add(HARDIRQ_OFFSET); \
|
|
lockdep_hardirq_enter(); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Like __irq_enter() without time accounting for fast
|
|
* interrupts, e.g. reschedule IPI where time accounting
|
|
* is more expensive than the actual interrupt.
|
|
*/
|
|
#define __irq_enter_raw() \
|
|
do { \
|
|
preempt_count_add(HARDIRQ_OFFSET); \
|
|
lockdep_hardirq_enter(); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Enter irq context (on NO_HZ, update jiffies):
|
|
*/
|
|
void irq_enter(void);
|
|
/*
|
|
* Like irq_enter(), but RCU is already watching.
|
|
*/
|
|
void irq_enter_rcu(void);
|
|
|
|
/*
|
|
* Exit irq context without processing softirqs:
|
|
*/
|
|
#define __irq_exit() \
|
|
do { \
|
|
lockdep_hardirq_exit(); \
|
|
account_irq_exit_time(current); \
|
|
preempt_count_sub(HARDIRQ_OFFSET); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Like __irq_exit() without time accounting
|
|
*/
|
|
#define __irq_exit_raw() \
|
|
do { \
|
|
lockdep_hardirq_exit(); \
|
|
preempt_count_sub(HARDIRQ_OFFSET); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Exit irq context and process softirqs if needed:
|
|
*/
|
|
void irq_exit(void);
|
|
|
|
/*
|
|
* Like irq_exit(), but return with RCU watching.
|
|
*/
|
|
void irq_exit_rcu(void);
|
|
|
|
#ifndef arch_nmi_enter
|
|
#define arch_nmi_enter() do { } while (0)
|
|
#define arch_nmi_exit() do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_TINY_RCU
|
|
static inline void rcu_nmi_enter(void) { }
|
|
static inline void rcu_nmi_exit(void) { }
|
|
#else
|
|
extern void rcu_nmi_enter(void);
|
|
extern void rcu_nmi_exit(void);
|
|
#endif
|
|
|
|
/*
|
|
* NMI vs Tracing
|
|
* --------------
|
|
*
|
|
* We must not land in a tracer until (or after) we've changed preempt_count
|
|
* such that in_nmi() becomes true. To that effect all NMI C entry points must
|
|
* be marked 'notrace' and call nmi_enter() as soon as possible.
|
|
*/
|
|
|
|
/*
|
|
* nmi_enter() can nest up to 15 times; see NMI_BITS.
|
|
*/
|
|
#define __nmi_enter() \
|
|
do { \
|
|
lockdep_off(); \
|
|
arch_nmi_enter(); \
|
|
printk_nmi_enter(); \
|
|
BUG_ON(in_nmi() == NMI_MASK); \
|
|
__preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
|
|
} while (0)
|
|
|
|
#define nmi_enter() \
|
|
do { \
|
|
__nmi_enter(); \
|
|
lockdep_hardirq_enter(); \
|
|
rcu_nmi_enter(); \
|
|
instrumentation_begin(); \
|
|
ftrace_nmi_enter(); \
|
|
instrumentation_end(); \
|
|
} while (0)
|
|
|
|
#define __nmi_exit() \
|
|
do { \
|
|
BUG_ON(!in_nmi()); \
|
|
__preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
|
|
printk_nmi_exit(); \
|
|
arch_nmi_exit(); \
|
|
lockdep_on(); \
|
|
} while (0)
|
|
|
|
#define nmi_exit() \
|
|
do { \
|
|
instrumentation_begin(); \
|
|
ftrace_nmi_exit(); \
|
|
instrumentation_end(); \
|
|
rcu_nmi_exit(); \
|
|
lockdep_hardirq_exit(); \
|
|
__nmi_exit(); \
|
|
} while (0)
|
|
|
|
#endif /* LINUX_HARDIRQ_H */
|