diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/posix-clock.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/posix-clock.h')
-rw-r--r-- | kernel/include/linux/posix-clock.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/kernel/include/linux/posix-clock.h b/kernel/include/linux/posix-clock.h new file mode 100644 index 000000000..34c4498b8 --- /dev/null +++ b/kernel/include/linux/posix-clock.h @@ -0,0 +1,151 @@ +/* + * posix-clock.h - support for dynamic clock devices + * + * Copyright (C) 2010 OMICRON electronics GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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 for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#ifndef _LINUX_POSIX_CLOCK_H_ +#define _LINUX_POSIX_CLOCK_H_ + +#include <linux/cdev.h> +#include <linux/fs.h> +#include <linux/poll.h> +#include <linux/posix-timers.h> +#include <linux/rwsem.h> + +struct posix_clock; + +/** + * struct posix_clock_operations - functional interface to the clock + * + * Every posix clock is represented by a character device. Drivers may + * optionally offer extended capabilities by implementing the + * character device methods. The character device file operations are + * first handled by the clock device layer, then passed on to the + * driver by calling these functions. + * + * @owner: The clock driver should set to THIS_MODULE + * @clock_adjtime: Adjust the clock + * @clock_gettime: Read the current time + * @clock_getres: Get the clock resolution + * @clock_settime: Set the current time value + * @timer_create: Create a new timer + * @timer_delete: Remove a previously created timer + * @timer_gettime: Get remaining time and interval of a timer + * @timer_settime: Set a timer's initial expiration and interval + * @fasync: Optional character device fasync method + * @mmap: Optional character device mmap method + * @open: Optional character device open method + * @release: Optional character device release method + * @ioctl: Optional character device ioctl method + * @read: Optional character device read method + * @poll: Optional character device poll method + */ +struct posix_clock_operations { + struct module *owner; + + int (*clock_adjtime)(struct posix_clock *pc, struct timex *tx); + + int (*clock_gettime)(struct posix_clock *pc, struct timespec *ts); + + int (*clock_getres) (struct posix_clock *pc, struct timespec *ts); + + int (*clock_settime)(struct posix_clock *pc, + const struct timespec *ts); + + int (*timer_create) (struct posix_clock *pc, struct k_itimer *kit); + + int (*timer_delete) (struct posix_clock *pc, struct k_itimer *kit); + + void (*timer_gettime)(struct posix_clock *pc, + struct k_itimer *kit, struct itimerspec *tsp); + + int (*timer_settime)(struct posix_clock *pc, + struct k_itimer *kit, int flags, + struct itimerspec *tsp, struct itimerspec *old); + /* + * Optional character device methods: + */ + int (*fasync) (struct posix_clock *pc, + int fd, struct file *file, int on); + + long (*ioctl) (struct posix_clock *pc, + unsigned int cmd, unsigned long arg); + + int (*mmap) (struct posix_clock *pc, + struct vm_area_struct *vma); + + int (*open) (struct posix_clock *pc, fmode_t f_mode); + + uint (*poll) (struct posix_clock *pc, + struct file *file, poll_table *wait); + + int (*release) (struct posix_clock *pc); + + ssize_t (*read) (struct posix_clock *pc, + uint flags, char __user *buf, size_t cnt); +}; + +/** + * struct posix_clock - represents a dynamic posix clock + * + * @ops: Functional interface to the clock + * @cdev: Character device instance for this clock + * @kref: Reference count. + * @rwsem: Protects the 'zombie' field from concurrent access. + * @zombie: If 'zombie' is true, then the hardware has disappeared. + * @release: A function to free the structure when the reference count reaches + * zero. May be NULL if structure is statically allocated. + * + * Drivers should embed their struct posix_clock within a private + * structure, obtaining a reference to it during callbacks using + * container_of(). + */ +struct posix_clock { + struct posix_clock_operations ops; + struct cdev cdev; + struct kref kref; + struct rw_semaphore rwsem; + bool zombie; + void (*release)(struct posix_clock *clk); +}; + +/** + * posix_clock_register() - register a new clock + * @clk: Pointer to the clock. Caller must provide 'ops' and 'release' + * @devid: Allocated device id + * + * A clock driver calls this function to register itself with the + * clock device subsystem. If 'clk' points to dynamically allocated + * memory, then the caller must provide a 'release' function to free + * that memory. + * + * Returns zero on success, non-zero otherwise. + */ +int posix_clock_register(struct posix_clock *clk, dev_t devid); + +/** + * posix_clock_unregister() - unregister a clock + * @clk: Clock instance previously registered via posix_clock_register() + * + * A clock driver calls this function to remove itself from the clock + * device subsystem. The posix_clock itself will remain (in an + * inactive state) until its reference count drops to zero, at which + * point it will be deallocated with its 'release' method. + */ +void posix_clock_unregister(struct posix_clock *clk); + +#endif |