diff options
Diffstat (limited to 'drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h')
| -rw-r--r-- | drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h b/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h new file mode 100644 index 000000000000..4a48b914b42a --- /dev/null +++ b/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h @@ -0,0 +1,275 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * libcfs/include/libcfs/linux/linux-time.h + * + * Implementation of portable time API for Linux (kernel and user-level). + * + * Author: Nikita Danilov <nikita@clusterfs.com> + */ + +#ifndef __LIBCFS_LINUX_LINUX_TIME_H__ +#define __LIBCFS_LINUX_LINUX_TIME_H__ + +#ifndef __LIBCFS_LIBCFS_H__ +#error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead +#endif + + +/* Portable time API */ + +/* + * Platform provides three opaque data-types: + * + * cfs_time_t represents point in time. This is internal kernel + * time rather than "wall clock". This time bears no + * relation to gettimeofday(). + * + * cfs_duration_t represents time interval with resolution of internal + * platform clock + * + * cfs_fs_time_t represents instance in world-visible time. This is + * used in file-system time-stamps + * + * cfs_time_t cfs_time_current(void); + * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t); + * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t); + * int cfs_impl_time_before (cfs_time_t, cfs_time_t); + * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t); + * + * cfs_duration_t cfs_duration_build(int64_t); + * + * time_t cfs_duration_sec (cfs_duration_t); + * void cfs_duration_usec(cfs_duration_t, struct timeval *); + * void cfs_duration_nsec(cfs_duration_t, struct timespec *); + * + * void cfs_fs_time_current(cfs_fs_time_t *); + * time_t cfs_fs_time_sec (cfs_fs_time_t *); + * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *); + * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *); + * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *); + * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *); + * + * CFS_TIME_FORMAT + * CFS_DURATION_FORMAT + * + */ + +#define ONE_BILLION ((u_int64_t)1000000000) +#define ONE_MILLION 1000000 + + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/version.h> +#include <linux/time.h> +#include <asm/div64.h> + +#include <linux/libcfs/linux/portals_compat25.h> + +/* + * post 2.5 kernels. + */ + +#include <linux/jiffies.h> + +typedef struct timespec cfs_fs_time_t; + +static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v) +{ + v->tv_sec = t->tv_sec; + v->tv_usec = t->tv_nsec / 1000; +} + +static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s) +{ + *s = *t; +} + +/* + * internal helper function used by cfs_fs_time_before*() + */ +static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t) +{ + return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec; +} + + +/* + * Generic kernel stuff + */ + +typedef unsigned long cfs_time_t; /* jiffies */ +typedef long cfs_duration_t; +typedef cycles_t cfs_cycles_t; + +static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2) +{ + return time_before(t1, t2); +} + +static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2) +{ + return time_before_eq(t1, t2); +} + +static inline cfs_time_t cfs_time_current(void) +{ + return jiffies; +} + +static inline time_t cfs_time_current_sec(void) +{ + return get_seconds(); +} + +static inline void cfs_fs_time_current(cfs_fs_time_t *t) +{ + *t = CURRENT_TIME; +} + +static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t) +{ + return t->tv_sec; +} + +static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2) +{ + return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2); +} + +static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2) +{ + return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2); +} + +#if 0 +static inline cfs_duration_t cfs_duration_build(int64_t nano) +{ +#if (BITS_PER_LONG == 32) + /* We cannot use do_div(t, ONE_BILLION), do_div can only process + * 64 bits n and 32 bits base */ + int64_t t = nano * HZ; + do_div(t, 1000); + do_div(t, 1000000); + return (cfs_duration_t)t; +#else + return (nano * HZ / ONE_BILLION); +#endif +} +#endif + +static inline cfs_duration_t cfs_time_seconds(int seconds) +{ + return ((cfs_duration_t)seconds) * HZ; +} + +static inline time_t cfs_duration_sec(cfs_duration_t d) +{ + return d / HZ; +} + +static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s) +{ +#if (BITS_PER_LONG == 32) && (HZ > 4096) + __u64 t; + + s->tv_sec = d / HZ; + t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION; + do_div(t, HZ); + s->tv_usec = t; +#else + s->tv_sec = d / HZ; + s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * \ + ONE_MILLION) / HZ; +#endif +} + +static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s) +{ +#if (BITS_PER_LONG == 32) + __u64 t; + + s->tv_sec = d / HZ; + t = (d - s->tv_sec * HZ) * ONE_BILLION; + do_div(t, HZ); + s->tv_nsec = t; +#else + s->tv_sec = d / HZ; + s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ; +#endif +} + +#define cfs_time_current_64 get_jiffies_64 + +static inline __u64 cfs_time_add_64(__u64 t, __u64 d) +{ + return t + d; +} + +static inline __u64 cfs_time_shift_64(int seconds) +{ + return cfs_time_add_64(cfs_time_current_64(), + cfs_time_seconds(seconds)); +} + +static inline int cfs_time_before_64(__u64 t1, __u64 t2) +{ + return (__s64)t2 - (__s64)t1 > 0; +} + +static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2) +{ + return (__s64)t2 - (__s64)t1 >= 0; +} + + +/* + * One jiffy + */ +#define CFS_TICK (1) + +#define CFS_TIME_T "%lu" +#define CFS_DURATION_T "%ld" + + +#endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */ +/* + * Local variables: + * c-indentation-style: "K&R" + * c-basic-offset: 8 + * tab-width: 8 + * fill-column: 80 + * scroll-step: 1 + * End: + */ |