cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hardirq.h (3516B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef LINUX_HARDIRQ_H
      3#define LINUX_HARDIRQ_H
      4
      5#include <linux/context_tracking_state.h>
      6#include <linux/preempt.h>
      7#include <linux/lockdep.h>
      8#include <linux/ftrace_irq.h>
      9#include <linux/sched.h>
     10#include <linux/vtime.h>
     11#include <asm/hardirq.h>
     12
     13extern void synchronize_irq(unsigned int irq);
     14extern bool synchronize_hardirq(unsigned int irq);
     15
     16#ifdef CONFIG_NO_HZ_FULL
     17void __rcu_irq_enter_check_tick(void);
     18#else
     19static inline void __rcu_irq_enter_check_tick(void) { }
     20#endif
     21
     22static __always_inline void rcu_irq_enter_check_tick(void)
     23{
     24	if (context_tracking_enabled())
     25		__rcu_irq_enter_check_tick();
     26}
     27
     28/*
     29 * It is safe to do non-atomic ops on ->hardirq_context,
     30 * because NMI handlers may not preempt and the ops are
     31 * always balanced, so the interrupted value of ->hardirq_context
     32 * will always be restored.
     33 */
     34#define __irq_enter()					\
     35	do {						\
     36		preempt_count_add(HARDIRQ_OFFSET);	\
     37		lockdep_hardirq_enter();		\
     38		account_hardirq_enter(current);		\
     39	} while (0)
     40
     41/*
     42 * Like __irq_enter() without time accounting for fast
     43 * interrupts, e.g. reschedule IPI where time accounting
     44 * is more expensive than the actual interrupt.
     45 */
     46#define __irq_enter_raw()				\
     47	do {						\
     48		preempt_count_add(HARDIRQ_OFFSET);	\
     49		lockdep_hardirq_enter();		\
     50	} while (0)
     51
     52/*
     53 * Enter irq context (on NO_HZ, update jiffies):
     54 */
     55void irq_enter(void);
     56/*
     57 * Like irq_enter(), but RCU is already watching.
     58 */
     59void irq_enter_rcu(void);
     60
     61/*
     62 * Exit irq context without processing softirqs:
     63 */
     64#define __irq_exit()					\
     65	do {						\
     66		account_hardirq_exit(current);		\
     67		lockdep_hardirq_exit();			\
     68		preempt_count_sub(HARDIRQ_OFFSET);	\
     69	} while (0)
     70
     71/*
     72 * Like __irq_exit() without time accounting
     73 */
     74#define __irq_exit_raw()				\
     75	do {						\
     76		lockdep_hardirq_exit();			\
     77		preempt_count_sub(HARDIRQ_OFFSET);	\
     78	} while (0)
     79
     80/*
     81 * Exit irq context and process softirqs if needed:
     82 */
     83void irq_exit(void);
     84
     85/*
     86 * Like irq_exit(), but return with RCU watching.
     87 */
     88void irq_exit_rcu(void);
     89
     90#ifndef arch_nmi_enter
     91#define arch_nmi_enter()	do { } while (0)
     92#define arch_nmi_exit()		do { } while (0)
     93#endif
     94
     95#ifdef CONFIG_TINY_RCU
     96static inline void rcu_nmi_enter(void) { }
     97static inline void rcu_nmi_exit(void) { }
     98#else
     99extern void rcu_nmi_enter(void);
    100extern void rcu_nmi_exit(void);
    101#endif
    102
    103/*
    104 * NMI vs Tracing
    105 * --------------
    106 *
    107 * We must not land in a tracer until (or after) we've changed preempt_count
    108 * such that in_nmi() becomes true. To that effect all NMI C entry points must
    109 * be marked 'notrace' and call nmi_enter() as soon as possible.
    110 */
    111
    112/*
    113 * nmi_enter() can nest up to 15 times; see NMI_BITS.
    114 */
    115#define __nmi_enter()						\
    116	do {							\
    117		lockdep_off();					\
    118		arch_nmi_enter();				\
    119		BUG_ON(in_nmi() == NMI_MASK);			\
    120		__preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\
    121	} while (0)
    122
    123#define nmi_enter()						\
    124	do {							\
    125		__nmi_enter();					\
    126		lockdep_hardirq_enter();			\
    127		rcu_nmi_enter();				\
    128		instrumentation_begin();			\
    129		ftrace_nmi_enter();				\
    130		instrumentation_end();				\
    131	} while (0)
    132
    133#define __nmi_exit()						\
    134	do {							\
    135		BUG_ON(!in_nmi());				\
    136		__preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET);	\
    137		arch_nmi_exit();				\
    138		lockdep_on();					\
    139	} while (0)
    140
    141#define nmi_exit()						\
    142	do {							\
    143		instrumentation_begin();			\
    144		ftrace_nmi_exit();				\
    145		instrumentation_end();				\
    146		rcu_nmi_exit();					\
    147		lockdep_hardirq_exit();				\
    148		__nmi_exit();					\
    149	} while (0)
    150
    151#endif /* LINUX_HARDIRQ_H */