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/* * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved. */ #ifndef _ASM_SPARC_VVAR_DATA_H #define _ASM_SPARC_VVAR_DATA_H #include <asm/clocksource.h> #include <linux/seqlock.h> #include <linux/time.h> #include <linux/types.h> struct vvar_data { unsigned int seq; int vclock_mode; struct { /* extract of a clocksource struct */ u64 cycle_last; u64 mask; int mult; int shift; } clock; /* open coded 'struct timespec' */ u64 wall_time_sec; u64 wall_time_snsec; u64 monotonic_time_snsec; u64 monotonic_time_sec; u64 monotonic_time_coarse_sec; u64 monotonic_time_coarse_nsec; u64 wall_time_coarse_sec; u64 wall_time_coarse_nsec; int tz_minuteswest; int tz_dsttime; }; extern struct vvar_data *vvar_data; extern int vdso_fix_stick; static inline unsigned int vvar_read_begin(const struct vvar_data *s) { unsigned int ret; repeat: ret = READ_ONCE(s->seq); if (unlikely(ret & 1)) { cpu_relax(); goto repeat; } smp_rmb(); /* Finish all reads before we return seq */ return ret; } static inline int vvar_read_retry(const struct vvar_data *s, unsigned int start) { smp_rmb(); /* Finish all reads before checking the value of seq */ return unlikely(s->seq != start); } static inline void vvar_write_begin(struct vvar_data *s) { ++s->seq; smp_wmb(); /* Makes sure that increment of seq is reflected */ } static inline void vvar_write_end(struct vvar_data *s) { smp_wmb(); /* Makes the value of seq current before we increment */ ++s->seq; } #endif /* _ASM_SPARC_VVAR_DATA_H */
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