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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mmap_lock.h (4353B)

      1#ifndef _LINUX_MMAP_LOCK_H
      2#define _LINUX_MMAP_LOCK_H
      3
      4#include <linux/lockdep.h>
      5#include <linux/mm_types.h>
      6#include <linux/mmdebug.h>
      7#include <linux/rwsem.h>
      8#include <linux/tracepoint-defs.h>
      9#include <linux/types.h>
     10
     11#define MMAP_LOCK_INITIALIZER(name) \
     12	.mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
     13
     14DECLARE_TRACEPOINT(mmap_lock_start_locking);
     15DECLARE_TRACEPOINT(mmap_lock_acquire_returned);
     16DECLARE_TRACEPOINT(mmap_lock_released);
     17
     18#ifdef CONFIG_TRACING
     19
     20void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write);
     21void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
     22					   bool success);
     23void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write);
     24
     25static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
     26						   bool write)
     27{
     28	if (tracepoint_enabled(mmap_lock_start_locking))
     29		__mmap_lock_do_trace_start_locking(mm, write);
     30}
     31
     32static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
     33						      bool write, bool success)
     34{
     35	if (tracepoint_enabled(mmap_lock_acquire_returned))
     36		__mmap_lock_do_trace_acquire_returned(mm, write, success);
     37}
     38
     39static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
     40{
     41	if (tracepoint_enabled(mmap_lock_released))
     42		__mmap_lock_do_trace_released(mm, write);
     43}
     44
     45#else /* !CONFIG_TRACING */
     46
     47static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
     48						   bool write)
     49{
     50}
     51
     52static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
     53						      bool write, bool success)
     54{
     55}
     56
     57static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
     58{
     59}
     60
     61#endif /* CONFIG_TRACING */
     62
     63static inline void mmap_init_lock(struct mm_struct *mm)
     64{
     65	init_rwsem(&mm->mmap_lock);
     66}
     67
     68static inline void mmap_write_lock(struct mm_struct *mm)
     69{
     70	__mmap_lock_trace_start_locking(mm, true);
     71	down_write(&mm->mmap_lock);
     72	__mmap_lock_trace_acquire_returned(mm, true, true);
     73}
     74
     75static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
     76{
     77	__mmap_lock_trace_start_locking(mm, true);
     78	down_write_nested(&mm->mmap_lock, subclass);
     79	__mmap_lock_trace_acquire_returned(mm, true, true);
     80}
     81
     82static inline int mmap_write_lock_killable(struct mm_struct *mm)
     83{
     84	int ret;
     85
     86	__mmap_lock_trace_start_locking(mm, true);
     87	ret = down_write_killable(&mm->mmap_lock);
     88	__mmap_lock_trace_acquire_returned(mm, true, ret == 0);
     89	return ret;
     90}
     91
     92static inline bool mmap_write_trylock(struct mm_struct *mm)
     93{
     94	bool ret;
     95
     96	__mmap_lock_trace_start_locking(mm, true);
     97	ret = down_write_trylock(&mm->mmap_lock) != 0;
     98	__mmap_lock_trace_acquire_returned(mm, true, ret);
     99	return ret;
    100}
    101
    102static inline void mmap_write_unlock(struct mm_struct *mm)
    103{
    104	__mmap_lock_trace_released(mm, true);
    105	up_write(&mm->mmap_lock);
    106}
    107
    108static inline void mmap_write_downgrade(struct mm_struct *mm)
    109{
    110	__mmap_lock_trace_acquire_returned(mm, false, true);
    111	downgrade_write(&mm->mmap_lock);
    112}
    113
    114static inline void mmap_read_lock(struct mm_struct *mm)
    115{
    116	__mmap_lock_trace_start_locking(mm, false);
    117	down_read(&mm->mmap_lock);
    118	__mmap_lock_trace_acquire_returned(mm, false, true);
    119}
    120
    121static inline int mmap_read_lock_killable(struct mm_struct *mm)
    122{
    123	int ret;
    124
    125	__mmap_lock_trace_start_locking(mm, false);
    126	ret = down_read_killable(&mm->mmap_lock);
    127	__mmap_lock_trace_acquire_returned(mm, false, ret == 0);
    128	return ret;
    129}
    130
    131static inline bool mmap_read_trylock(struct mm_struct *mm)
    132{
    133	bool ret;
    134
    135	__mmap_lock_trace_start_locking(mm, false);
    136	ret = down_read_trylock(&mm->mmap_lock) != 0;
    137	__mmap_lock_trace_acquire_returned(mm, false, ret);
    138	return ret;
    139}
    140
    141static inline void mmap_read_unlock(struct mm_struct *mm)
    142{
    143	__mmap_lock_trace_released(mm, false);
    144	up_read(&mm->mmap_lock);
    145}
    146
    147static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
    148{
    149	__mmap_lock_trace_released(mm, false);
    150	up_read_non_owner(&mm->mmap_lock);
    151}
    152
    153static inline void mmap_assert_locked(struct mm_struct *mm)
    154{
    155	lockdep_assert_held(&mm->mmap_lock);
    156	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
    157}
    158
    159static inline void mmap_assert_write_locked(struct mm_struct *mm)
    160{
    161	lockdep_assert_held_write(&mm->mmap_lock);
    162	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
    163}
    164
    165static inline int mmap_lock_is_contended(struct mm_struct *mm)
    166{
    167	return rwsem_is_contended(&mm->mmap_lock);
    168}
    169
    170#endif /* _LINUX_MMAP_LOCK_H */