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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse Source 
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (62 commits)
  posix-clocks: Check write permissions in posix syscalls
  hrtimer: Remove empty hrtimer_init_hres_timer()
  hrtimer: Update hrtimer->state documentation
  hrtimer: Update base[CLOCK_BOOTTIME].offset correctly
  timers: Export CLOCK_BOOTTIME via the posix timers interface
  timers: Add CLOCK_BOOTTIME hrtimer base
  time: Extend get_xtime_and_monotonic_offset() to also return sleep
  time: Introduce get_monotonic_boottime and ktime_get_boottime
  hrtimers: extend hrtimer base code to handle more then 2 clockids
  ntp: Remove redundant and incorrect parameter check
  mn10300: Switch do_timer() to xtimer_update()
  posix clocks: Introduce dynamic clocks
  posix-timers: Cleanup namespace
  posix-timers: Add support for fd based clocks
  x86: Add clock_adjtime for x86
  posix-timers: Introduce a syscall for clock tuning.
  time: Splitout compat timex accessors
  ntp: Add ADJ_SETOFFSET mode bit
  time: Introduce timekeeping_inject_offset
  posix-timer: Update comment
  ...

Fix up new system-call-related conflicts in
	arch/x86/ia32/ia32entry.S
	arch/x86/include/asm/unistd_32.h
	arch/x86/include/asm/unistd_64.h
	arch/x86/kernel/syscall_table_32.S
(name_to_handle_at()/open_by_handle_at() vs clock_adjtime()), and some
due to movement of get_jiffies_64() in:
	kernel/time.c
This commit is contained in:
Linus Torvalds 2011-03-15 18:53:35 -07:00
commit 420c1c572d
56 changed files with 1276 additions and 508 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/alpha/kernel/time.c
View File

@ -159,7 +159,7 @@ void read_persistent_clock(struct timespec *ts)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
irqreturn_t timer_interrupt(int irq, void *dev)
{
@ -172,8 +172,6 @@ irqreturn_t timer_interrupt(int irq, void *dev)
profile_tick(CPU_PROFILING);
#endif
write_seqlock(&xtime_lock);
/*
* Calculate how many ticks have passed since the last update,
* including any previous partial leftover. Save any resulting
@ -187,9 +185,7 @@ irqreturn_t timer_interrupt(int irq, void *dev)
nticks = delta >> FIX_SHIFT;
if (nticks)
do_timer(nticks);
write_sequnlock(&xtime_lock);
xtime_update(nticks);
if (test_irq_work_pending()) {
clear_irq_work_pending();

4
arch/arm/kernel/time.c
View File

@ -107,9 +107,7 @@ void timer_tick(void)
{
profile_tick(CPU_PROFILING);
do_leds();
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));
#endif

2
arch/arm/mach-clps711x/include/mach/time.h
View File

@ -30,7 +30,7 @@ p720t_timer_interrupt(int irq, void *dev_id)
{
struct pt_regs *regs = get_irq_regs();
do_leds();
do_timer(1);
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif

6
arch/blackfin/kernel/time.c
View File

@ -114,16 +114,14 @@ u32 arch_gettimeoffset(void)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
#ifdef CONFIG_CORE_TIMER_IRQ_L1
__attribute__((l1_text))
#endif
irqreturn_t timer_interrupt(int irq, void *dummy)
{
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
#ifdef CONFIG_IPIPE
update_root_process_times(get_irq_regs());

4
arch/cris/arch-v10/kernel/time.c
View File

@ -140,7 +140,7 @@ stop_watchdog(void)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
//static unsigned short myjiff; /* used by our debug routine print_timestamp */
@ -176,7 +176,7 @@ timer_interrupt(int irq, void *dev_id)
/* call the real timer interrupt handler */
do_timer(1);
xtime_update(1);
cris_do_profile(regs); /* Save profiling information */
return IRQ_HANDLED;

6
arch/cris/arch-v32/kernel/time.c
View File

@ -183,7 +183,7 @@ void handle_watchdog_bite(struct pt_regs *regs)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick.
* as well as call the "xtime_update()" routine every clocktick.
*/
extern void cris_do_profile(struct pt_regs *regs);
@ -216,9 +216,7 @@ static inline irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
/* Call the real timer interrupt handler */
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
return IRQ_HANDLED;
}

14
arch/frv/kernel/time.c
View File

@ -50,21 +50,13 @@ static struct irqaction timer_irq = {
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
profile_tick(CPU_PROFILING);
/*
* Here we are in the timer irq handler. We just have irqs locally
* disabled but we don't know if the timer_bh is running on the other
* CPU. We need to avoid to SMP race with it. NOTE: we don't need
* the irq version of write_lock because as just said we have irq
* locally disabled. -arca
*/
write_seqlock(&xtime_lock);
do_timer(1);
xtime_update(1);
#ifdef CONFIG_HEARTBEAT
static unsigned short n;
@ -72,8 +64,6 @@ static irqreturn_t timer_interrupt(int irq, void *dummy)
__set_LEDS(n);
#endif /* CONFIG_HEARTBEAT */
write_sequnlock(&xtime_lock);
update_process_times(user_mode(get_irq_regs()));
return IRQ_HANDLED;

4
arch/h8300/kernel/time.c
View File

@ -35,9 +35,7 @@ void h8300_timer_tick(void)
{
if (current->pid)
profile_tick(CPU_PROFILING);
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
update_process_times(user_mode(get_irq_regs()));
}

2
arch/h8300/kernel/timer/timer8.c
View File

@ -61,7 +61,7 @@
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
static irqreturn_t timer_interrupt(int irq, void *dev_id)

19
arch/ia64/kernel/time.c
View File

@ -190,19 +190,10 @@ timer_interrupt (int irq, void *dev_id)
new_itm += local_cpu_data->itm_delta;
if (smp_processor_id() == time_keeper_id) {
/*
* Here we are in the timer irq handler. We have irqs locally
* disabled, but we don't know if the timer_bh is running on
* another CPU. We need to avoid to SMP race by acquiring the
* xtime_lock.
*/
write_seqlock(&xtime_lock);
do_timer(1);
local_cpu_data->itm_next = new_itm;
write_sequnlock(&xtime_lock);
} else
local_cpu_data->itm_next = new_itm;
if (smp_processor_id() == time_keeper_id)
xtime_update(1);
local_cpu_data->itm_next = new_itm;
if (time_after(new_itm, ia64_get_itc()))
break;
@ -222,7 +213,7 @@ timer_interrupt (int irq, void *dev_id)
* comfort, we increase the safety margin by
* intentionally dropping the next tick(s). We do NOT
* update itm.next because that would force us to call
* do_timer() which in turn would let our clock run
* xtime_update() which in turn would let our clock run
* too fast (with the potentially devastating effect
* of losing monotony of time).
*/

13
arch/ia64/xen/time.c
View File

@ -139,14 +139,11 @@ consider_steal_time(unsigned long new_itm)
run_posix_cpu_timers(p);
delta_itm += local_cpu_data->itm_delta * (stolen + blocked);
if (cpu == time_keeper_id) {
write_seqlock(&xtime_lock);
do_timer(stolen + blocked);
local_cpu_data->itm_next = delta_itm + new_itm;
write_sequnlock(&xtime_lock);
} else {
local_cpu_data->itm_next = delta_itm + new_itm;
}
if (cpu == time_keeper_id)
xtime_update(stolen + blocked);
local_cpu_data->itm_next = delta_itm + new_itm;
per_cpu(xen_stolen_time, cpu) += NS_PER_TICK * stolen;
per_cpu(xen_blocked_time, cpu) += NS_PER_TICK * blocked;
}

5
arch/m32r/kernel/time.c
View File

@ -107,15 +107,14 @@ u32 arch_gettimeoffset(void)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
#ifndef CONFIG_SMP
profile_tick(CPU_PROFILING);
#endif
/* XXX FIXME. Uh, the xtime_lock should be held here, no? */
do_timer(1);
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));

4
arch/m68k/bvme6000/config.c
View File

@ -45,8 +45,8 @@ extern int bvme6000_set_clock_mmss (unsigned long);
extern void bvme6000_reset (void);
void bvme6000_set_vectors (void);
/* Save tick handler routine pointer, will point to do_timer() in
* kernel/sched.c, called via bvme6000_process_int() */
/* Save tick handler routine pointer, will point to xtime_update() in
* kernel/timer/timekeeping.c, called via bvme6000_process_int() */
static irq_handler_t tick_handler;

4
arch/m68k/kernel/time.c
View File

@ -37,11 +37,11 @@ static inline int set_rtc_mmss(unsigned long nowtime)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
static irqreturn_t timer_interrupt(int irq, void *dummy)
{
do_timer(1);
xtime_update(1);
update_process_times(user_mode(get_irq_regs()));
profile_tick(CPU_PROFILING);

4
arch/m68k/mvme147/config.c
View File

@ -46,8 +46,8 @@ extern void mvme147_reset (void);
static int bcd2int (unsigned char b);
/* Save tick handler routine pointer, will point to do_timer() in
* kernel/sched.c, called via mvme147_process_int() */
/* Save tick handler routine pointer, will point to xtime_update() in
* kernel/time/timekeeping.c, called via mvme147_process_int() */
irq_handler_t tick_handler;

4
arch/m68k/mvme16x/config.c
View File

@ -51,8 +51,8 @@ extern void mvme16x_reset (void);
int bcd2int (unsigned char b);
/* Save tick handler routine pointer, will point to do_timer() in
* kernel/sched.c, called via mvme16x_process_int() */
/* Save tick handler routine pointer, will point to xtime_update() in
* kernel/time/timekeeping.c, called via mvme16x_process_int() */
static irq_handler_t tick_handler;

2
arch/m68k/sun3/sun3ints.c
View File

@ -66,7 +66,7 @@ static irqreturn_t sun3_int5(int irq, void *dev_id)
#ifdef CONFIG_SUN3
intersil_clear();
#endif
do_timer(1);
xtime_update(1);
update_process_times(user_mode(get_irq_regs()));
if (!(kstat_cpu(0).irqs[irq] % 20))
sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 160) / 20]);

8
arch/m68knommu/kernel/time.c
View File

@ -36,7 +36,7 @@ static inline int set_rtc_mmss(unsigned long nowtime)
#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
irqreturn_t arch_timer_interrupt(int irq, void *dummy)
{
@ -44,11 +44,7 @@ irqreturn_t arch_timer_interrupt(int irq, void *dummy)
if (current->pid)
profile_tick(CPU_PROFILING);
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
update_process_times(user_mode(get_irq_regs()));

6
arch/mn10300/kernel/time.c
View File

@ -104,8 +104,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
unsigned tsc, elapse;
irqreturn_t ret;
write_seqlock(&xtime_lock);
while (tsc = get_cycles(),
elapse = tsc - mn10300_last_tsc, /* time elapsed since last
* tick */
@ -114,11 +112,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
mn10300_last_tsc += MN10300_TSC_PER_HZ;
/* advance the kernel's time tracking system */
do_timer(1);
xtime_update(1);
}
write_sequnlock(&xtime_lock);
ret = local_timer_interrupt();
#ifdef CONFIG_SMP
send_IPI_allbutself(LOCAL_TIMER_IPI);

7
arch/parisc/kernel/time.c
View File

@ -162,11 +162,8 @@ irqreturn_t __irq_entry timer_interrupt(int irq, void *dev_id)
update_process_times(user_mode(get_irq_regs()));
}
if (cpu == 0) {
write_seqlock(&xtime_lock);
do_timer(ticks_elapsed);
write_sequnlock(&xtime_lock);
}
if (cpu == 0)
xtime_update(ticks_elapsed);
return IRQ_HANDLED;
}

4
arch/sparc/kernel/pcic.c
View File

@ -700,10 +700,8 @@ static void pcic_clear_clock_irq(void)
static irqreturn_t pcic_timer_handler (int irq, void *h)
{
write_seqlock(&xtime_lock); /* Dummy, to show that we remember */
pcic_clear_clock_irq();
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));
#endif

9
arch/sparc/kernel/time_32.c
View File

@ -85,7 +85,7 @@ int update_persistent_clock(struct timespec now)
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
* as well as call the "xtime_update()" routine every clocktick
*/
#define TICK_SIZE (tick_nsec / 1000)
@ -96,14 +96,9 @@ static irqreturn_t timer_interrupt(int dummy, void *dev_id)
profile_tick(CPU_PROFILING);
#endif
/* Protect counter clear so that do_gettimeoffset works */
write_seqlock(&xtime_lock);
clear_clock_irq();
do_timer(1);
write_sequnlock(&xtime_lock);
xtime_update(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));

1
arch/x86/ia32/ia32entry.S
View File

@ -855,4 +855,5 @@ ia32_sys_call_table:
.quad sys_prlimit64 /* 340 */
.quad sys_name_to_handle_at
.quad compat_sys_open_by_handle_at
.quad compat_sys_clock_adjtime
ia32_syscall_end:

3
arch/x86/include/asm/unistd_32.h
View File

@ -348,10 +348,11 @@
#define __NR_prlimit64 340
#define __NR_name_to_handle_at 341
#define __NR_open_by_handle_at 342
#define __NR_clock_adjtime 343
#ifdef __KERNEL__
#define NR_syscalls 343
#define NR_syscalls 344
#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR

2
arch/x86/include/asm/unistd_64.h
View File

@ -673,6 +673,8 @@ __SYSCALL(__NR_prlimit64, sys_prlimit64)
__SYSCALL(__NR_name_to_handle_at, sys_name_to_handle_at)
#define __NR_open_by_handle_at 304
__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)
#define __NR_clock_adjtime 305
__SYSCALL(__NR_clock_adjtime, sys_clock_adjtime)
#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR

1
arch/x86/kernel/syscall_table_32.S
View File

@ -342,3 +342,4 @@ ENTRY(sys_call_table)
.long sys_prlimit64 /* 340 */
.long sys_name_to_handle_at
.long sys_open_by_handle_at
.long sys_clock_adjtime

6
arch/xtensa/kernel/time.c
View File

@ -96,16 +96,12 @@ irqreturn_t timer_interrupt (int irq, void *dev_id)
update_process_times(user_mode(get_irq_regs()));
#endif
write_seqlock(&xtime_lock);
do_timer(1); /* Linux handler in kernel/timer.c */
xtime_update(1); /* Linux handler in kernel/time/timekeeping */
/* Note that writing CCOMPARE clears the interrupt. */
next += CCOUNT_PER_JIFFY;
set_linux_timer(next);
write_sequnlock(&xtime_lock);
}
/* Allow platform to do something useful (Wdog). */

30
drivers/char/mmtimer.c
View File

@ -53,6 +53,8 @@ MODULE_LICENSE("GPL");
#define RTC_BITS 55 /* 55 bits for this implementation */
static struct k_clock sgi_clock;
extern unsigned long sn_rtc_cycles_per_second;
#define RTC_COUNTER_ADDR ((long *)LOCAL_MMR_ADDR(SH_RTC))
@ -487,7 +489,7 @@ static int sgi_clock_get(clockid_t clockid, struct timespec *tp)
return 0;
};
static int sgi_clock_set(clockid_t clockid, struct timespec *tp)
static int sgi_clock_set(const clockid_t clockid, const struct timespec *tp)
{
u64 nsec;
@ -763,15 +765,21 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
return err;
}
static int sgi_clock_getres(const clockid_t which_clock, struct timespec *tp)
{
tp->tv_sec = 0;
tp->tv_nsec = sgi_clock_period;
return 0;
}
static struct k_clock sgi_clock = {
.res = 0,
.clock_set = sgi_clock_set,
.clock_get = sgi_clock_get,
.timer_create = sgi_timer_create,
.nsleep = do_posix_clock_nonanosleep,
.timer_set = sgi_timer_set,
.timer_del = sgi_timer_del,
.timer_get = sgi_timer_get
.clock_set = sgi_clock_set,
.clock_get = sgi_clock_get,
.clock_getres = sgi_clock_getres,
.timer_create = sgi_timer_create,
.timer_set = sgi_timer_set,
.timer_del = sgi_timer_del,
.timer_get = sgi_timer_get
};
/**
@ -831,8 +839,8 @@ static int __init mmtimer_init(void)
(unsigned long) node);
}
sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second;
register_posix_clock(CLOCK_SGI_CYCLE, &sgi_clock);
sgi_clock_period = NSEC_PER_SEC / sn_rtc_cycles_per_second;
posix_timers_register_clock(CLOCK_SGI_CYCLE, &sgi_clock);
printk(KERN_INFO "%s: v%s, %ld MHz\n", MMTIMER_DESC, MMTIMER_VERSION,
sn_rtc_cycles_per_second/(unsigned long)1E6);

24
include/linux/hrtimer.h
View File

@ -54,11 +54,13 @@ enum hrtimer_restart {
* 0x00 inactive
* 0x01 enqueued into rbtree
* 0x02 callback function running
* 0x04 timer is migrated to another cpu
*
* Special cases:
* 0x03 callback function running and enqueued
* (was requeued on another CPU)
* 0x09 timer was migrated on CPU hotunplug
* 0x05 timer was migrated on CPU hotunplug
*
* The "callback function running and enqueued" status is only possible on
* SMP. It happens for example when a posix timer expired and the callback
* queued a signal. Between dropping the lock which protects the posix timer
@ -67,8 +69,11 @@ enum hrtimer_restart {
* as otherwise the timer could be removed before the softirq code finishes the
* the handling of the timer.
*
* The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state to
* preserve the HRTIMER_STATE_CALLBACK bit in the above scenario.
* The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state
* to preserve the HRTIMER_STATE_CALLBACK in the above scenario. This
* also affects HRTIMER_STATE_MIGRATE where the preservation is not
* necessary. HRTIMER_STATE_MIGRATE is cleared after the timer is
* enqueued on the new cpu.
*
* All state transitions are protected by cpu_base->lock.
*/
@ -148,7 +153,12 @@ struct hrtimer_clock_base {
#endif
};
#define HRTIMER_MAX_CLOCK_BASES 2
enum hrtimer_base_type {
HRTIMER_BASE_REALTIME,
HRTIMER_BASE_MONOTONIC,
HRTIMER_BASE_BOOTTIME,
HRTIMER_MAX_CLOCK_BASES,
};
/*
* struct hrtimer_cpu_base - the per cpu clock bases
@ -308,6 +318,7 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
extern ktime_t ktime_get_boottime(void);
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
@ -370,8 +381,9 @@ extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
extern ktime_t hrtimer_get_next_event(void);
/*
* A timer is active, when it is enqueued into the rbtree or the callback
* function is running.
* A timer is active, when it is enqueued into the rbtree or the
* callback function is running or it's in the state of being migrated
* to another cpu.
*/
static inline int hrtimer_active(const struct hrtimer *timer)
{

150
include/linux/posix-clock.h Normal file
View File

@ -0,0 +1,150 @@
/*
* 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>
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_setttime: 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.
* @mutex: 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 mutex mutex;
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

44
include/linux/posix-timers.h
View File

@ -4,6 +4,7 @@
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/timex.h>
union cpu_time_count {
cputime_t cpu;
@ -17,10 +18,21 @@ struct cpu_timer_list {
int firing;
};
/*
* Bit fields within a clockid:
*
* The most significant 29 bits hold either a pid or a file descriptor.
*
* Bit 2 indicates whether a cpu clock refers to a thread or a process.
*
* Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3.
*
* A clockid is invalid if bits 2, 1, and 0 are all set.
*/
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
#define CPUCLOCK_PERTHREAD(clock) \
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
#define CPUCLOCK_PID_MASK 7
#define CPUCLOCK_PERTHREAD_MASK 4
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
#define CPUCLOCK_CLOCK_MASK 3
@ -28,12 +40,17 @@ struct cpu_timer_list {
#define CPUCLOCK_VIRT 1
#define CPUCLOCK_SCHED 2
#define CPUCLOCK_MAX 3
#define CLOCKFD CPUCLOCK_MAX
#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
#define MAKE_THREAD_CPUCLOCK(tid, clock) \
MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
/* POSIX.1b interval timer structure. */
struct k_itimer {
struct list_head list; /* free/ allocate list */
@ -67,10 +84,11 @@ struct k_itimer {
};
struct k_clock {
int res; /* in nanoseconds */
int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
int (*clock_set) (const clockid_t which_clock, struct timespec * tp);
int (*clock_set) (const clockid_t which_clock,
const struct timespec *tp);
int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
int (*timer_create) (struct k_itimer *timer);
int (*nsleep) (const clockid_t which_clock, int flags,
struct timespec *, struct timespec __user *);
@ -84,28 +102,14 @@ struct k_clock {
struct itimerspec * cur_setting);
};
void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock);
extern struct k_clock clock_posix_cpu;
extern struct k_clock clock_posix_dynamic;
/* error handlers for timer_create, nanosleep and settime */
int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *,
struct timespec __user *);
int do_posix_clock_nosettime(const clockid_t, struct timespec *tp);
void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
/* function to call to trigger timer event */
int posix_timer_event(struct k_itimer *timr, int si_private);
int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *ts);
int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts);
int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);
int posix_cpu_timer_create(struct k_itimer *timer);
int posix_cpu_nsleep(const clockid_t which_clock, int flags,
struct timespec *rqtp, struct timespec __user *rmtp);
long posix_cpu_nsleep_restart(struct restart_block *restart_block);
int posix_cpu_timer_set(struct k_itimer *timer, int flags,
struct itimerspec *new, struct itimerspec *old);
int posix_cpu_timer_del(struct k_itimer *timer);
void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp);
void posix_cpu_timer_schedule(struct k_itimer *timer);
void run_posix_cpu_timers(struct task_struct *task);

2
include/linux/sched.h
View File

@ -2046,7 +2046,7 @@ extern void release_uids(struct user_namespace *ns);
#include <asm/current.h>
extern void do_timer(unsigned long ticks);
extern void xtime_update(unsigned long ticks);
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);

9
include/linux/security.h
View File

@ -53,7 +53,7 @@ struct audit_krule;
*/
extern int cap_capable(struct task_struct *tsk, const struct cred *cred,
int cap, int audit);
extern int cap_settime(struct timespec *ts, struct timezone *tz);
extern int cap_settime(const struct timespec *ts, const struct timezone *tz);
extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);
extern int cap_ptrace_traceme(struct task_struct *parent);
extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
@ -1387,7 +1387,7 @@ struct security_operations {
int (*quotactl) (int cmds, int type, int id, struct super_block *sb);
int (*quota_on) (struct dentry *dentry);
int (*syslog) (int type);
int (*settime) (struct timespec *ts, struct timezone *tz);
int (*settime) (const struct timespec *ts, const struct timezone *tz);
int (*vm_enough_memory) (struct mm_struct *mm, long pages);
int (*bprm_set_creds) (struct linux_binprm *bprm);
@ -1669,7 +1669,7 @@ int security_sysctl(struct ctl_table *table, int op);
int security_quotactl(int cmds, int type, int id, struct super_block *sb);
int security_quota_on(struct dentry *dentry);
int security_syslog(int type);
int security_settime(struct timespec *ts, struct timezone *tz);
int security_settime(const struct timespec *ts, const struct timezone *tz);
int security_vm_enough_memory(long pages);
int security_vm_enough_memory_mm(struct mm_struct *mm, long pages);
int security_vm_enough_memory_kern(long pages);
@ -1904,7 +1904,8 @@ static inline int security_syslog(int type)
return 0;
}
static inline int security_settime(struct timespec *ts, struct timezone *tz)
static inline int security_settime(const struct timespec *ts,
const struct timezone *tz)
{
return cap_settime(ts, tz);
}

2
include/linux/syscalls.h
View File

@ -316,6 +316,8 @@ asmlinkage long sys_clock_settime(clockid_t which_clock,
const struct timespec __user *tp);
asmlinkage long sys_clock_gettime(clockid_t which_clock,
struct timespec __user *tp);
asmlinkage long sys_clock_adjtime(clockid_t which_clock,
struct timex __user *tx);
asmlinkage long sys_clock_getres(clockid_t which_clock,
struct timespec __user *tp);
asmlinkage long sys_clock_nanosleep(clockid_t which_clock, int flags,

3
include/linux/thread_info.h
View File

@ -18,9 +18,6 @@ struct compat_timespec;
struct restart_block {
long (*fn)(struct restart_block *);
union {
struct {
unsigned long arg0, arg1, arg2, arg3;
};
/* For futex_wait and futex_wait_requeue_pi */
struct {
u32 __user *uaddr;

14
include/linux/time.h
View File

@ -113,8 +113,6 @@ static inline struct timespec timespec_sub(struct timespec lhs,
#define timespec_valid(ts) \
(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
extern seqlock_t xtime_lock;
extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);
extern int update_persistent_clock(struct timespec now);
@ -125,8 +123,9 @@ extern int timekeeping_suspended;
unsigned long get_seconds(void);
struct timespec current_kernel_time(void);
struct timespec __current_kernel_time(void); /* does not take xtime_lock */
struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */
struct timespec get_monotonic_coarse(void);
void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
struct timespec *wtom, struct timespec *sleep);
#define CURRENT_TIME (current_kernel_time())
#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
@ -147,8 +146,9 @@ static inline u32 arch_gettimeoffset(void) { return 0; }
#endif
extern void do_gettimeofday(struct timeval *tv);
extern int do_settimeofday(struct timespec *tv);
extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
extern int do_settimeofday(const struct timespec *tv);
extern int do_sys_settimeofday(const struct timespec *tv,
const struct timezone *tz);
#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
struct itimerval;
@ -162,12 +162,13 @@ extern void getnstime_raw_and_real(struct timespec *ts_raw,
struct timespec *ts_real);
extern void getboottime(struct timespec *ts);
extern void monotonic_to_bootbased(struct timespec *ts);
extern void get_monotonic_boottime(struct timespec *ts);
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
extern u64 timekeeping_max_deferment(void);
extern void update_wall_time(void);
extern void timekeeping_leap_insert(int leapsecond);
extern int timekeeping_inject_offset(struct timespec *ts);
struct tms;
extern void do_sys_times(struct tms *);
@ -292,6 +293,7 @@ struct itimerval {
#define CLOCK_MONOTONIC_RAW 4
#define CLOCK_REALTIME_COARSE 5
#define CLOCK_MONOTONIC_COARSE 6
#define CLOCK_BOOTTIME 7
/*
* The IDs of various hardware clocks:

3
include/linux/timex.h
View File

@ -73,7 +73,7 @@ struct timex {
long tolerance; /* clock frequency tolerance (ppm)
* (read only)
*/
struct timeval time; /* (read only) */
struct timeval time; /* (read only, except for ADJ_SETOFFSET) */
long tick; /* (modified) usecs between clock ticks */
long ppsfreq; /* pps frequency (scaled ppm) (ro) */
@ -102,6 +102,7 @@ struct timex {
#define ADJ_STATUS 0x0010 /* clock status */
#define ADJ_TIMECONST 0x0020 /* pll time constant */
#define ADJ_TAI 0x0080 /* set TAI offset */
#define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */
#define ADJ_MICRO 0x1000 /* select microsecond resolution */
#define ADJ_NANO 0x2000 /* select nanosecond resolution */
#define ADJ_TICK 0x4000 /* tick value */

136
kernel/compat.c
View File

@ -52,6 +52,64 @@ static int compat_put_timeval(struct compat_timeval __user *o,
put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
}
static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
{
memset(txc, 0, sizeof(struct timex));
if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
__get_user(txc->modes, &utp->modes) ||
__get_user(txc->offset, &utp->offset) ||
__get_user(txc->freq, &utp->freq) ||
__get_user(txc->maxerror, &utp->maxerror) ||
__get_user(txc->esterror, &utp->esterror) ||
__get_user(txc->status, &utp->status) ||
__get_user(txc->constant, &utp->constant) ||
__get_user(txc->precision, &utp->precision) ||
__get_user(txc->tolerance, &utp->tolerance) ||
__get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
__get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
__get_user(txc->tick, &utp->tick) ||
__get_user(txc->ppsfreq, &utp->ppsfreq) ||
__get_user(txc->jitter, &utp->jitter) ||
__get_user(txc->shift, &utp->shift) ||
__get_user(txc->stabil, &utp->stabil) ||
__get_user(txc->jitcnt, &utp->jitcnt) ||
__get_user(txc->calcnt, &utp->calcnt) ||
__get_user(txc->errcnt, &utp->errcnt) ||
__get_user(txc->stbcnt, &utp->stbcnt))
return -EFAULT;
return 0;
}
static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
{
if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
__put_user(txc->modes, &utp->modes) ||
__put_user(txc->offset, &utp->offset) ||
__put_user(txc->freq, &utp->freq) ||
__put_user(txc->maxerror, &utp->maxerror) ||
__put_user(txc->esterror, &utp->esterror) ||
__put_user(txc->status, &utp->status) ||
__put_user(txc->constant, &utp->constant) ||
__put_user(txc->precision, &utp->precision) ||
__put_user(txc->tolerance, &utp->tolerance) ||
__put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
__put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
__put_user(txc->tick, &utp->tick) ||
__put_user(txc->ppsfreq, &utp->ppsfreq) ||
__put_user(txc->jitter, &utp->jitter) ||
__put_user(txc->shift, &utp->shift) ||
__put_user(txc->stabil, &utp->stabil) ||
__put_user(txc->jitcnt, &utp->jitcnt) ||
__put_user(txc->calcnt, &utp->calcnt) ||
__put_user(txc->errcnt, &utp->errcnt) ||
__put_user(txc->stbcnt, &utp->stbcnt) ||
__put_user(txc->tai, &utp->tai))
return -EFAULT;
return 0;
}
asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
struct timezone __user *tz)
{
@ -617,6 +675,29 @@ long compat_sys_clock_gettime(clockid_t which_clock,
return err;
}
long compat_sys_clock_adjtime(clockid_t which_clock,
struct compat_timex __user *utp)
{
struct timex txc;
mm_segment_t oldfs;
int err, ret;
err = compat_get_timex(&txc, utp);
if (err)
return err;
oldfs = get_fs();
set_fs(KERNEL_DS);
ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
set_fs(oldfs);
err = compat_put_timex(utp, &txc);
if (err)
return err;
return ret;
}
long compat_sys_clock_getres(clockid_t which_clock,
struct compat_timespec __user *tp)
{
@ -951,58 +1032,17 @@ asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat
asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
{
struct timex txc;
int ret;
int err, ret;
memset(&txc, 0, sizeof(struct timex));
if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
__get_user(txc.modes, &utp->modes) ||
__get_user(txc.offset, &utp->offset) ||
__get_user(txc.freq, &utp->freq) ||
__get_user(txc.maxerror, &utp->maxerror) ||
__get_user(txc.esterror, &utp->esterror) ||
__get_user(txc.status, &utp->status) ||
__get_user(txc.constant, &utp->constant) ||
__get_user(txc.precision, &utp->precision) ||
__get_user(txc.tolerance, &utp->tolerance) ||
__get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
__get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
__get_user(txc.tick, &utp->tick) ||
__get_user(txc.ppsfreq, &utp->ppsfreq) ||
__get_user(txc.jitter, &utp->jitter) ||
__get_user(txc.shift, &utp->shift) ||
__get_user(txc.stabil, &utp->stabil) ||
__get_user(txc.jitcnt, &utp->jitcnt) ||
__get_user(txc.calcnt, &utp->calcnt) ||
__get_user(txc.errcnt, &utp->errcnt) ||
__get_user(txc.stbcnt, &utp->stbcnt))
return -EFAULT;
err = compat_get_timex(&txc, utp);
if (err)
return err;
ret = do_adjtimex(&txc);
if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
__put_user(txc.modes, &utp->modes) ||
__put_user(txc.offset, &utp->offset) ||
__put_user(txc.freq, &utp->freq) ||
__put_user(txc.maxerror, &utp->maxerror) ||
__put_user(txc.esterror, &utp->esterror) ||
__put_user(txc.status, &utp->status) ||
__put_user(txc.constant, &utp->constant) ||
__put_user(txc.precision, &utp->precision) ||
__put_user(txc.tolerance, &utp->tolerance) ||
__put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
__put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
__put_user(txc.tick, &utp->tick) ||
__put_user(txc.ppsfreq, &utp->ppsfreq) ||
__put_user(txc.jitter, &utp->jitter) ||
__put_user(txc.shift, &utp->shift) ||
__put_user(txc.stabil, &utp->stabil) ||
__put_user(txc.jitcnt, &utp->jitcnt) ||
__put_user(txc.calcnt, &utp->calcnt) ||
__put_user(txc.errcnt, &utp->errcnt) ||
__put_user(txc.stbcnt, &utp->stbcnt) ||
__put_user(txc.tai, &utp->tai))
ret = -EFAULT;
err = compat_put_timex(utp, &txc);
if (err)
return err;
return ret;
}

84
kernel/hrtimer.c
View File

@ -53,11 +53,10 @@
/*
* The timer bases:
*
* Note: If we want to add new timer bases, we have to skip the two
* clock ids captured by the cpu-timers. We do this by holding empty
* entries rather than doing math adjustment of the clock ids.
* This ensures that we capture erroneous accesses to these clock ids
* rather than moving them into the range of valid clock id's.
* There are more clockids then hrtimer bases. Thus, we index
* into the timer bases by the hrtimer_base_type enum. When trying
* to reach a base using a clockid, hrtimer_clockid_to_base()
* is used to convert from clockid to the proper hrtimer_base_type.
*/
DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
{
@ -74,30 +73,39 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
.get_time = &ktime_get,
.resolution = KTIME_LOW_RES,
},
{
.index = CLOCK_BOOTTIME,
.get_time = &ktime_get_boottime,
.resolution = KTIME_LOW_RES,
},
}
};
static int hrtimer_clock_to_base_table[MAX_CLOCKS];
static inline int hrtimer_clockid_to_base(clockid_t clock_id)
{
return hrtimer_clock_to_base_table[clock_id];
}
/*
* Get the coarse grained time at the softirq based on xtime and
* wall_to_monotonic.
*/
static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
{
ktime_t xtim, tomono;
struct timespec xts, tom;
unsigned long seq;
ktime_t xtim, mono, boot;
struct timespec xts, tom, slp;
do {
seq = read_seqbegin(&xtime_lock);
xts = __current_kernel_time();
tom = __get_wall_to_monotonic();
} while (read_seqretry(&xtime_lock, seq));
get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp);
xtim = timespec_to_ktime(xts);
tomono = timespec_to_ktime(tom);
base->clock_base[CLOCK_REALTIME].softirq_time = xtim;
base->clock_base[CLOCK_MONOTONIC].softirq_time =
ktime_add(xtim, tomono);
mono = ktime_add(xtim, timespec_to_ktime(tom));
boot = ktime_add(mono, timespec_to_ktime(slp));
base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;
base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot;
}
/*
@ -184,10 +192,11 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
struct hrtimer_cpu_base *new_cpu_base;
int this_cpu = smp_processor_id();
int cpu = hrtimer_get_target(this_cpu, pinned);
int basenum = hrtimer_clockid_to_base(base->index);
again:
new_cpu_base = &per_cpu(hrtimer_bases, cpu);
new_base = &new_cpu_base->clock_base[base->index];
new_base = &new_cpu_base->clock_base[basenum];
if (base != new_base) {
/*
@ -617,24 +626,23 @@ static int hrtimer_reprogram(struct hrtimer *timer,
static void retrigger_next_event(void *arg)
{
struct hrtimer_cpu_base *base;
struct timespec realtime_offset, wtm;
unsigned long seq;
struct timespec realtime_offset, wtm, sleep;
if (!hrtimer_hres_active())
return;
do {
seq = read_seqbegin(&xtime_lock);
wtm = __get_wall_to_monotonic();
} while (read_seqretry(&xtime_lock, seq));
get_xtime_and_monotonic_and_sleep_offset(&realtime_offset, &wtm,
&sleep);
set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
base = &__get_cpu_var(hrtimer_bases);
/* Adjust CLOCK_REALTIME offset */
raw_spin_lock(&base->lock);
base->clock_base[CLOCK_REALTIME].offset =
base->clock_base[HRTIMER_BASE_REALTIME].offset =
timespec_to_ktime(realtime_offset);
base->clock_base[HRTIMER_BASE_BOOTTIME].offset =
timespec_to_ktime(sleep);
hrtimer_force_reprogram(base, 0);
raw_spin_unlock(&base->lock);
@ -678,14 +686,6 @@ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base)
base->hres_active = 0;
}
/*
* Initialize the high resolution related parts of a hrtimer
*/
static inline void hrtimer_init_timer_hres(struct hrtimer *timer)
{
}
/*
* When High resolution timers are active, try to reprogram. Note, that in case
* the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry
@ -731,8 +731,9 @@ static int hrtimer_switch_to_hres(void)
return 0;
}
base->hres_active = 1;
base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES;
base->clock_base[CLOCK_MONOTONIC].resolution = KTIME_HIGH_RES;
base->clock_base[HRTIMER_BASE_REALTIME].resolution = KTIME_HIGH_RES;
base->clock_base[HRTIMER_BASE_MONOTONIC].resolution = KTIME_HIGH_RES;
base->clock_base[HRTIMER_BASE_BOOTTIME].resolution = KTIME_HIGH_RES;
tick_setup_sched_timer();
@ -756,7 +757,6 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
return 0;
}
static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { }
#endif /* CONFIG_HIGH_RES_TIMERS */
@ -1127,6 +1127,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
enum hrtimer_mode mode)
{
struct hrtimer_cpu_base *cpu_base;
int base;
memset(timer, 0, sizeof(struct hrtimer));
@ -1135,8 +1136,8 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
clock_id = CLOCK_MONOTONIC;
timer->base = &cpu_base->clock_base[clock_id];
hrtimer_init_timer_hres(timer);
base = hrtimer_clockid_to_base(clock_id);
timer->base = &cpu_base->clock_base[base];
timerqueue_init(&timer->node);
#ifdef CONFIG_TIMER_STATS
@ -1171,9 +1172,10 @@ EXPORT_SYMBOL_GPL(hrtimer_init);
int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
{
struct hrtimer_cpu_base *cpu_base;
int base = hrtimer_clockid_to_base(which_clock);
cpu_base = &__raw_get_cpu_var(hrtimer_bases);
*tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution);
*tp = ktime_to_timespec(cpu_base->clock_base[base].resolution);
return 0;
}
@ -1720,6 +1722,10 @@ static struct notifier_block __cpuinitdata hrtimers_nb = {
void __init hrtimers_init(void)
{
hrtimer_clock_to_base_table[CLOCK_REALTIME] = HRTIMER_BASE_REALTIME;
hrtimer_clock_to_base_table[CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC;
hrtimer_clock_to_base_table[CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME;
hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
register_cpu_notifier(&hrtimers_nb);

110
kernel/posix-cpu-timers.c
View File

@ -176,7 +176,8 @@ static inline cputime_t virt_ticks(struct task_struct *p)
return p->utime;
}
int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
static int
posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
{
int error = check_clock(which_clock);
if (!error) {
@ -194,7 +195,8 @@ int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
return error;
}
int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
static int
posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
{
/*
* You can never reset a CPU clock, but we check for other errors
@ -317,7 +319,7 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
}
int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
{
const pid_t pid = CPUCLOCK_PID(which_clock);
int error = -EINVAL;
@ -379,7 +381,7 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
* This is called from sys_timer_create() and do_cpu_nanosleep() with the
* new timer already all-zeros initialized.
*/
int posix_cpu_timer_create(struct k_itimer *new_timer)
static int posix_cpu_timer_create(struct k_itimer *new_timer)
{
int ret = 0;
const pid_t pid = CPUCLOCK_PID(new_timer->it_clock);
@ -425,7 +427,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
* If we return TIMER_RETRY, it's necessary to release the timer's lock
* and try again. (This happens when the timer is in the middle of firing.)
*/
int posix_cpu_timer_del(struct k_itimer *timer)
static int posix_cpu_timer_del(struct k_itimer *timer)
{
struct task_struct *p = timer->it.cpu.task;
int ret = 0;
@ -665,8 +667,8 @@ static int cpu_timer_sample_group(const clockid_t which_clock,
* If we return TIMER_RETRY, it's necessary to release the timer's lock
* and try again. (This happens when the timer is in the middle of firing.)
*/
int posix_cpu_timer_set(struct k_itimer *timer, int flags,
struct itimerspec *new, struct itimerspec *old)
static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
struct itimerspec *new, struct itimerspec *old)
{
struct task_struct *p = timer->it.cpu.task;
union cpu_time_count old_expires, new_expires, old_incr, val;
@ -820,7 +822,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
return ret;
}
void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
{
union cpu_time_count now;
struct task_struct *p = timer->it.cpu.task;
@ -1481,11 +1483,13 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
return error;
}
int posix_cpu_nsleep(const clockid_t which_clock, int flags,
struct timespec *rqtp, struct timespec __user *rmtp)
static long posix_cpu_nsleep_restart(struct restart_block *restart_block);
static int posix_cpu_nsleep(const clockid_t which_clock, int flags,
struct timespec *rqtp, struct timespec __user *rmtp)
{
struct restart_block *restart_block =
&current_thread_info()->restart_block;
&current_thread_info()->restart_block;
struct itimerspec it;
int error;
@ -1501,56 +1505,47 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags,
if (error == -ERESTART_RESTARTBLOCK) {
if (flags & TIMER_ABSTIME)
if (flags & TIMER_ABSTIME)
return -ERESTARTNOHAND;
/*
* Report back to the user the time still remaining.
*/
if (rmtp != NULL && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
* Report back to the user the time still remaining.
*/
if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
return -EFAULT;
restart_block->fn = posix_cpu_nsleep_restart;
restart_block->arg0 = which_clock;
restart_block->arg1 = (unsigned long) rmtp;
restart_block->arg2 = rqtp->tv_sec;
restart_block->arg3 = rqtp->tv_nsec;
restart_block->nanosleep.index = which_clock;
restart_block->nanosleep.rmtp = rmtp;
restart_block->nanosleep.expires = timespec_to_ns(rqtp);
}
return error;
}
long posix_cpu_nsleep_restart(struct restart_block *restart_block)
static long posix_cpu_nsleep_restart(struct restart_block *restart_block)
{
clockid_t which_clock = restart_block->arg0;
struct timespec __user *rmtp;
clockid_t which_clock = restart_block->nanosleep.index;
struct timespec t;
struct itimerspec it;
int error;
rmtp = (struct timespec __user *) restart_block->arg1;
t.tv_sec = restart_block->arg2;
t.tv_nsec = restart_block->arg3;
t = ns_to_timespec(restart_block->nanosleep.expires);
restart_block->fn = do_no_restart_syscall;
error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it);
if (error == -ERESTART_RESTARTBLOCK) {
struct timespec __user *rmtp = restart_block->nanosleep.rmtp;
/*
* Report back to the user the time still remaining.
*/
if (rmtp != NULL && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
* Report back to the user the time still remaining.
*/
if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
return -EFAULT;
restart_block->fn = posix_cpu_nsleep_restart;
restart_block->arg0 = which_clock;
restart_block->arg1 = (unsigned long) rmtp;
restart_block->arg2 = t.tv_sec;
restart_block->arg3 = t.tv_nsec;
restart_block->nanosleep.expires = timespec_to_ns(&t);
}
return error;
}
#define PROCESS_CLOCK MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED)
#define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED)
@ -1594,38 +1589,37 @@ static int thread_cpu_timer_create(struct k_itimer *timer)
timer->it_clock = THREAD_CLOCK;
return posix_cpu_timer_create(timer);
}
static int thread_cpu_nsleep(const clockid_t which_clock, int flags,
struct timespec *rqtp, struct timespec __user *rmtp)
{
return -EINVAL;
}
static long thread_cpu_nsleep_restart(struct restart_block *restart_block)
{
return -EINVAL;
}
struct k_clock clock_posix_cpu = {
.clock_getres = posix_cpu_clock_getres,
.clock_set = posix_cpu_clock_set,
.clock_get = posix_cpu_clock_get,
.timer_create = posix_cpu_timer_create,
.nsleep = posix_cpu_nsleep,
.nsleep_restart = posix_cpu_nsleep_restart,
.timer_set = posix_cpu_timer_set,
.timer_del = posix_cpu_timer_del,
.timer_get = posix_cpu_timer_get,
};
static __init int init_posix_cpu_timers(void)
{
struct k_clock process = {
.clock_getres = process_cpu_clock_getres,
.clock_get = process_cpu_clock_get,
.clock_set = do_posix_clock_nosettime,
.timer_create = process_cpu_timer_create,
.nsleep = process_cpu_nsleep,
.nsleep_restart = process_cpu_nsleep_restart,
.clock_getres = process_cpu_clock_getres,
.clock_get = process_cpu_clock_get,
.timer_create = process_cpu_timer_create,
.nsleep = process_cpu_nsleep,
.nsleep_restart = process_cpu_nsleep_restart,
};
struct k_clock thread = {
.clock_getres = thread_cpu_clock_getres,
.clock_get = thread_cpu_clock_get,
.clock_set = do_posix_clock_nosettime,
.timer_create = thread_cpu_timer_create,
.nsleep = thread_cpu_nsleep,
.nsleep_restart = thread_cpu_nsleep_restart,
.clock_getres = thread_cpu_clock_getres,
.clock_get = thread_cpu_clock_get,
.timer_create = thread_cpu_timer_create,
};
struct timespec ts;
register_posix_clock(CLOCK_PROCESS_CPUTIME_ID, &process);
register_posix_clock(CLOCK_THREAD_CPUTIME_ID, &thread);
posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process);
posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread);
cputime_to_timespec(cputime_one_jiffy, &ts);
onecputick = ts.tv_nsec;

342
kernel/posix-timers.c
View File

@ -41,6 +41,7 @@
#include <linux/init.h>
#include <linux/compiler.h>
#include <linux/idr.h>
#include <linux/posix-clock.h>
#include <linux/posix-timers.h>
#include <linux/syscalls.h>
#include <linux/wait.h>
@ -81,6 +82,14 @@ static DEFINE_SPINLOCK(idr_lock);
#error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"
#endif
/*
* parisc wants ENOTSUP instead of EOPNOTSUPP
*/
#ifndef ENOTSUP
# define ENANOSLEEP_NOTSUP EOPNOTSUPP
#else
# define ENANOSLEEP_NOTSUP ENOTSUP
#endif
/*
* The timer ID is turned into a timer address by idr_find().
@ -94,11 +103,7 @@ static DEFINE_SPINLOCK(idr_lock);
/*
* CLOCKs: The POSIX standard calls for a couple of clocks and allows us
* to implement others. This structure defines the various
* clocks and allows the possibility of adding others. We
* provide an interface to add clocks to the table and expect
* the "arch" code to add at least one clock that is high
* resolution. Here we define the standard CLOCK_REALTIME as a
* 1/HZ resolution clock.
* clocks.
*
* RESOLUTION: Clock resolution is used to round up timer and interval
* times, NOT to report clock times, which are reported with as
@ -108,20 +113,13 @@ static DEFINE_SPINLOCK(idr_lock);
* necessary code is written. The standard says we should say
* something about this issue in the documentation...
*
* FUNCTIONS: The CLOCKs structure defines possible functions to handle
* various clock functions. For clocks that use the standard
* system timer code these entries should be NULL. This will
* allow dispatch without the overhead of indirect function
* calls. CLOCKS that depend on other sources (e.g. WWV or GPS)
* must supply functions here, even if the function just returns
* ENOSYS. The standard POSIX timer management code assumes the
* following: 1.) The k_itimer struct (sched.h) is used for the
* timer. 2.) The list, it_lock, it_clock, it_id and it_pid
* fields are not modified by timer code.
* FUNCTIONS: The CLOCKs structure defines possible functions to
* handle various clock functions.
*
* At this time all functions EXCEPT clock_nanosleep can be
* redirected by the CLOCKS structure. Clock_nanosleep is in
* there, but the code ignores it.
* The standard POSIX timer management code assumes the
* following: 1.) The k_itimer struct (sched.h) is used for
* the timer. 2.) The list, it_lock, it_clock, it_id and
* it_pid fields are not modified by timer code.
*
* Permissions: It is assumed that the clock_settime() function defined
* for each clock will take care of permission checks. Some
@ -138,6 +136,7 @@ static struct k_clock posix_clocks[MAX_CLOCKS];
*/
static int common_nsleep(const clockid_t, int flags, struct timespec *t,
struct timespec __user *rmtp);
static int common_timer_create(struct k_itimer *new_timer);
static void common_timer_get(struct k_itimer *, struct itimerspec *);
static int common_timer_set(struct k_itimer *, int,
struct itimerspec *, struct itimerspec *);
@ -158,76 +157,24 @@ static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
spin_unlock_irqrestore(&timr->it_lock, flags);
}
/*
* Call the k_clock hook function if non-null, or the default function.
*/
#define CLOCK_DISPATCH(clock, call, arglist) \
((clock) < 0 ? posix_cpu_##call arglist : \
(posix_clocks[clock].call != NULL \
? (*posix_clocks[clock].call) arglist : common_##call arglist))
/*
* Default clock hook functions when the struct k_clock passed
* to register_posix_clock leaves a function pointer null.
*
* The function common_CALL is the default implementation for
* the function pointer CALL in struct k_clock.
*/
static inline int common_clock_getres(const clockid_t which_clock,
struct timespec *tp)
{
tp->tv_sec = 0;
tp->tv_nsec = posix_clocks[which_clock].res;
return 0;
}
/*
* Get real time for posix timers
*/
static int common_clock_get(clockid_t which_clock, struct timespec *tp)
/* Get clock_realtime */
static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp)
{
ktime_get_real_ts(tp);
return 0;
}
static inline int common_clock_set(const clockid_t which_clock,
struct timespec *tp)
/* Set clock_realtime */
static int posix_clock_realtime_set(const clockid_t which_clock,
const struct timespec *tp)
{
return do_sys_settimeofday(tp, NULL);
}
static int common_timer_create(struct k_itimer *new_timer)
static int posix_clock_realtime_adj(const clockid_t which_clock,
struct timex *t)
{
hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
return 0;
}
static int no_timer_create(struct k_itimer *new_timer)
{
return -EOPNOTSUPP;
}
static int no_nsleep(const clockid_t which_clock, int flags,
struct timespec *tsave, struct timespec __user *rmtp)
{
return -EOPNOTSUPP;
}
/*
* Return nonzero if we know a priori this clockid_t value is bogus.
*/
static inline int invalid_clockid(const clockid_t which_clock)
{
if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */
return 0;
if ((unsigned) which_clock >= MAX_CLOCKS)
return 1;
if (posix_clocks[which_clock].clock_getres != NULL)
return 0;
if (posix_clocks[which_clock].res != 0)
return 0;
return 1;
return do_adjtimex(t);
}
/*
@ -240,7 +187,7 @@ static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
}
/*
* Get monotonic time for posix timers
* Get monotonic-raw time for posix timers
*/
static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
{
@ -267,46 +214,70 @@ static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp
*tp = ktime_to_timespec(KTIME_LOW_RES);
return 0;
}
static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp)
{
get_monotonic_boottime(tp);
return 0;
}
/*
* Initialize everything, well, just everything in Posix clocks/timers ;)
*/
static __init int init_posix_timers(void)
{
struct k_clock clock_realtime = {
.clock_getres = hrtimer_get_res,
.clock_getres = hrtimer_get_res,
.clock_get = posix_clock_realtime_get,
.clock_set = posix_clock_realtime_set,
.clock_adj = posix_clock_realtime_adj,
.nsleep = common_nsleep,
.nsleep_restart = hrtimer_nanosleep_restart,
.timer_create = common_timer_create,
.timer_set = common_timer_set,
.timer_get = common_timer_get,
.timer_del = common_timer_del,
};
struct k_clock clock_monotonic = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_ktime_get_ts,
.clock_set = do_posix_clock_nosettime,
.clock_getres = hrtimer_get_res,
.clock_get = posix_ktime_get_ts,
.nsleep = common_nsleep,
.nsleep_restart = hrtimer_nanosleep_restart,
.timer_create = common_timer_create,
.timer_set = common_timer_set,
.timer_get = common_timer_get,
.timer_del = common_timer_del,
};
struct k_clock clock_monotonic_raw = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_monotonic_raw,
.clock_set = do_posix_clock_nosettime,
.timer_create = no_timer_create,
.nsleep = no_nsleep,
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_monotonic_raw,
};
struct k_clock clock_realtime_coarse = {
.clock_getres = posix_get_coarse_res,
.clock_get = posix_get_realtime_coarse,
.clock_set = do_posix_clock_nosettime,
.timer_create = no_timer_create,
.nsleep = no_nsleep,
.clock_getres = posix_get_coarse_res,
.clock_get = posix_get_realtime_coarse,
};
struct k_clock clock_monotonic_coarse = {
.clock_getres = posix_get_coarse_res,
.clock_get = posix_get_monotonic_coarse,
.clock_set = do_posix_clock_nosettime,
.timer_create = no_timer_create,
.nsleep = no_nsleep,
.clock_getres = posix_get_coarse_res,
.clock_get = posix_get_monotonic_coarse,
};
struct k_clock clock_boottime = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_boottime,
.nsleep = common_nsleep,
.nsleep_restart = hrtimer_nanosleep_restart,
.timer_create = common_timer_create,
.timer_set = common_timer_set,
.timer_get = common_timer_get,
.timer_del = common_timer_del,
};
register_posix_clock(CLOCK_REALTIME, &clock_realtime);
register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse);
register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse);
posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime);
posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic);
posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse);
posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse);
posix_timers_register_clock(CLOCK_BOOTTIME, &clock_boottime);
posix_timers_cache = kmem_cache_create("posix_timers_cache",
sizeof (struct k_itimer), 0, SLAB_PANIC,
@ -482,17 +453,29 @@ static struct pid *good_sigevent(sigevent_t * event)
return task_pid(rtn);
}
void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
void posix_timers_register_clock(const clockid_t clock_id,
struct k_clock *new_clock)
{
if ((unsigned) clock_id >= MAX_CLOCKS) {
printk("POSIX clock register failed for clock_id %d\n",
printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n",
clock_id);
return;
}
if (!new_clock->clock_get) {
printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n",
clock_id);
return;
}
if (!new_clock->clock_getres) {
printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n",
clock_id);
return;
}
posix_clocks[clock_id] = *new_clock;
}
EXPORT_SYMBOL_GPL(register_posix_clock);
EXPORT_SYMBOL_GPL(posix_timers_register_clock);
static struct k_itimer * alloc_posix_timer(void)
{
@ -523,19 +506,39 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
kmem_cache_free(posix_timers_cache, tmr);
}
static struct k_clock *clockid_to_kclock(const clockid_t id)
{
if (id < 0)
return (id & CLOCKFD_MASK) == CLOCKFD ?
&clock_posix_dynamic : &clock_posix_cpu;
if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
return NULL;
return &posix_clocks[id];
}
static int common_timer_create(struct k_itimer *new_timer)
{
hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
return 0;
}
/* Create a POSIX.1b interval timer. */
SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
struct sigevent __user *, timer_event_spec,
timer_t __user *, created_timer_id)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct k_itimer *new_timer;
int error, new_timer_id;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
if (invalid_clockid(which_clock))
if (!kc)
return -EINVAL;
if (!kc->timer_create)
return -EOPNOTSUPP;
new_timer = alloc_posix_timer();
if (unlikely(!new_timer))
@ -597,7 +600,7 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
goto out;
}
error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
error = kc->timer_create(new_timer);
if (error)
goto out;
@ -607,7 +610,7 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
spin_unlock_irq(&current->sighand->siglock);
return 0;
/*
/*
* In the case of the timer belonging to another task, after
* the task is unlocked, the timer is owned by the other task
* and may cease to exist at any time. Don't use or modify
@ -709,22 +712,28 @@ common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
struct itimerspec __user *, setting)
{
struct k_itimer *timr;
struct itimerspec cur_setting;
struct k_itimer *timr;
struct k_clock *kc;
unsigned long flags;
int ret = 0;
timr = lock_timer(timer_id, &flags);
if (!timr)
return -EINVAL;
CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting));
kc = clockid_to_kclock(timr->it_clock);
if (WARN_ON_ONCE(!kc || !kc->timer_get))
ret = -EINVAL;
else
kc->timer_get(timr, &cur_setting);
unlock_timer(timr, flags);
if (copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
return -EFAULT;
return 0;
return ret;
}
/*
@ -813,6 +822,7 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
int error = 0;
unsigned long flag;
struct itimerspec *rtn = old_setting ? &old_spec : NULL;
struct k_clock *kc;
if (!new_setting)
return -EINVAL;
@ -828,8 +838,11 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
if (!timr)
return -EINVAL;
error = CLOCK_DISPATCH(timr->it_clock, timer_set,
(timr, flags, &new_spec, rtn));
kc = clockid_to_kclock(timr->it_clock);
if (WARN_ON_ONCE(!kc || !kc->timer_set))
error = -EINVAL;
else
error = kc->timer_set(timr, flags, &new_spec, rtn);
unlock_timer(timr, flag);
if (error == TIMER_RETRY) {
@ -844,7 +857,7 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
return error;
}
static inline int common_timer_del(struct k_itimer *timer)
static int common_timer_del(struct k_itimer *timer)
{
timer->it.real.interval.tv64 = 0;
@ -855,7 +868,11 @@ static inline int common_timer_del(struct k_itimer *timer)
static inline int timer_delete_hook(struct k_itimer *timer)
{
return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer));
struct k_clock *kc = clockid_to_kclock(timer->it_clock);
if (WARN_ON_ONCE(!kc || !kc->timer_del))
return -EINVAL;
return kc->timer_del(timer);
}
/* Delete a POSIX.1b interval timer. */
@ -927,69 +944,76 @@ void exit_itimers(struct signal_struct *sig)
}
}
/* Not available / possible... functions */
int do_posix_clock_nosettime(const clockid_t clockid, struct timespec *tp)
{
return -EINVAL;
}
EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
int do_posix_clock_nonanosleep(const clockid_t clock, int flags,
struct timespec *t, struct timespec __user *r)
{
#ifndef ENOTSUP
return -EOPNOTSUPP; /* aka ENOTSUP in userland for POSIX */
#else /* parisc does define it separately. */
return -ENOTSUP;
#endif
}
EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep);
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
const struct timespec __user *, tp)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec new_tp;
if (invalid_clockid(which_clock))
if (!kc || !kc->clock_set)
return -EINVAL;
if (copy_from_user(&new_tp, tp, sizeof (*tp)))
return -EFAULT;
return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp));
return kc->clock_set(which_clock, &new_tp);
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
struct timespec __user *,tp)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec kernel_tp;
int error;
if (invalid_clockid(which_clock))
if (!kc)
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_get,
(which_clock, &kernel_tp));
error = kc->clock_get(which_clock, &kernel_tp);
if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
error = -EFAULT;
return error;
}
SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
struct timex __user *, utx)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct timex ktx;
int err;
if (!kc)
return -EINVAL;
if (!kc->clock_adj)
return -EOPNOTSUPP;
if (copy_from_user(&ktx, utx, sizeof(ktx)))
return -EFAULT;
err = kc->clock_adj(which_clock, &ktx);
if (!err && copy_to_user(utx, &ktx, sizeof(ktx)))
return -EFAULT;
return err;
}
SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
struct timespec __user *, tp)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec rtn_tp;
int error;
if (invalid_clockid(which_clock))
if (!kc)
return -EINVAL;
error = CLOCK_DISPATCH(which_clock, clock_getres,
(which_clock, &rtn_tp));
error = kc->clock_getres(which_clock, &rtn_tp);
if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) {
if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp)))
error = -EFAULT;
}
return error;
}
@ -1009,10 +1033,13 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
const struct timespec __user *, rqtp,
struct timespec __user *, rmtp)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec t;
if (invalid_clockid(which_clock))
if (!kc)
return -EINVAL;
if (!kc->nsleep)
return -ENANOSLEEP_NOTSUP;
if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
return -EFAULT;
@ -1020,27 +1047,20 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
if (!timespec_valid(&t))
return -EINVAL;
return CLOCK_DISPATCH(which_clock, nsleep,
(which_clock, flags, &t, rmtp));
}
/*
* nanosleep_restart for monotonic and realtime clocks
*/
static int common_nsleep_restart(struct restart_block *restart_block)
{
return hrtimer_nanosleep_restart(restart_block);
return kc->nsleep(which_clock, flags, &t, rmtp);
}
/*
* This will restart clock_nanosleep. This is required only by
* compat_clock_nanosleep_restart for now.
*/
long
clock_nanosleep_restart(struct restart_block *restart_block)
long clock_nanosleep_restart(struct restart_block *restart_block)
{
clockid_t which_clock = restart_block->arg0;
clockid_t which_clock = restart_block->nanosleep.index;
struct k_clock *kc = clockid_to_kclock(which_clock);
return CLOCK_DISPATCH(which_clock, nsleep_restart,
(restart_block));
if (WARN_ON_ONCE(!kc || !kc->nsleep_restart))
return -EINVAL;
return kc->nsleep_restart(restart_block);
}

20
kernel/time.c
View File

@ -150,7 +150,7 @@ static inline void warp_clock(void)
* various programs will get confused when the clock gets warped.
*/
int do_sys_settimeofday(struct timespec *tv, struct timezone *tz)
int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
{
static int firsttime = 1;
int error = 0;
@ -674,7 +674,6 @@ u64 nsecs_to_jiffies64(u64 n)
#endif
}
/**
* nsecs_to_jiffies - Convert nsecs in u64 to jiffies
*
@ -693,23 +692,6 @@ unsigned long nsecs_to_jiffies(u64 n)
return (unsigned long)nsecs_to_jiffies64(n);
}
#if (BITS_PER_LONG < 64)
u64 get_jiffies_64(void)
{
unsigned long seq;
u64 ret;
do {
seq = read_seqbegin(&xtime_lock);
ret = jiffies_64;
} while (read_seqretry(&xtime_lock, seq));
return ret;
}
EXPORT_SYMBOL(get_jiffies_64);
#endif
EXPORT_SYMBOL(jiffies);
/*
* Add two timespec values and do a safety check for overflow.
* It's assumed that both values are valid (>= 0)

3
kernel/time/Makefile
View File

@ -1,4 +1,5 @@
obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o timecompare.o timeconv.o
obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o timecompare.o
obj-y += timeconv.o posix-clock.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD) += clockevents.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o

1
kernel/time/clockevents.c
View File

@ -18,7 +18,6 @@
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/sysdev.h>
#include <linux/tick.h>
#include "tick-internal.h"

20
kernel/time/jiffies.c
View File

@ -22,8 +22,11 @@
************************************************************************/
#include <linux/clocksource.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/init.h>
#include "tick-internal.h"
/* The Jiffies based clocksource is the lowest common
* denominator clock source which should function on
* all systems. It has the same coarse resolution as
@ -64,6 +67,23 @@ struct clocksource clocksource_jiffies = {
.shift = JIFFIES_SHIFT,
};
#if (BITS_PER_LONG < 64)
u64 get_jiffies_64(void)
{
unsigned long seq;
u64 ret;
do {
seq = read_seqbegin(&xtime_lock);
ret = jiffies_64;
} while (read_seqretry(&xtime_lock, seq));
return ret;
}
EXPORT_SYMBOL(get_jiffies_64);
#endif
EXPORT_SYMBOL(jiffies);
static int __init init_jiffies_clocksource(void)
{
return clocksource_register(&clocksource_jiffies);

13
kernel/time/ntp.c
View File

@ -16,6 +16,8 @@
#include <linux/mm.h>
#include <linux/module.h>
#include "tick-internal.h"
/*
* NTP timekeeping variables:
*/
@ -646,6 +648,17 @@ int do_adjtimex(struct timex *txc)
hrtimer_cancel(&leap_timer);
}
if (txc->modes & ADJ_SETOFFSET) {
struct timespec delta;
delta.tv_sec = txc->time.tv_sec;
delta.tv_nsec = txc->time.tv_usec;
if (!(txc->modes & ADJ_NANO))
delta.tv_nsec *= 1000;
result = timekeeping_inject_offset(&delta);
if (result)
return result;
}
getnstimeofday(&ts);
write_seqlock_irq(&xtime_lock);

451
kernel/time/posix-clock.c Normal file
View File

@ -0,0 +1,451 @@
/*
* posix-clock.c - 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.
*/
#include <linux/device.h>
#include <linux/file.h>
#include <linux/mutex.h>
#include <linux/posix-clock.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
static void delete_clock(struct kref *kref);
/*
* Returns NULL if the posix_clock instance attached to 'fp' is old and stale.
*/
static struct posix_clock *get_posix_clock(struct file *fp)
{
struct posix_clock *clk = fp->private_data;
mutex_lock(&clk->mutex);
if (!clk->zombie)
return clk;
mutex_unlock(&clk->mutex);
return NULL;
}
static void put_posix_clock(struct posix_clock *clk)
{
mutex_unlock(&clk->mutex);
}
static ssize_t posix_clock_read(struct file *fp, char __user *buf,
size_t count, loff_t *ppos)
{
struct posix_clock *clk = get_posix_clock(fp);
int err = -EINVAL;
if (!clk)
return -ENODEV;
if (clk->ops.read)
err = clk->ops.read(clk, fp->f_flags, buf, count);
put_posix_clock(clk);
return err;
}
static unsigned int posix_clock_poll(struct file *fp, poll_table *wait)
{
struct posix_clock *clk = get_posix_clock(fp);
int result = 0;
if (!clk)
return -ENODEV;
if (clk->ops.poll)
result = clk->ops.poll(clk, fp, wait);
put_posix_clock(clk);
return result;
}
static int posix_clock_fasync(int fd, struct file *fp, int on)
{
struct posix_clock *clk = get_posix_clock(fp);
int err = 0;
if (!clk)
return -ENODEV;
if (clk->ops.fasync)
err = clk->ops.fasync(clk, fd, fp, on);
put_posix_clock(clk);
return err;
}
static int posix_clock_mmap(struct file *fp, struct vm_area_struct *vma)
{
struct posix_clock *clk = get_posix_clock(fp);
int err = -ENODEV;
if (!clk)
return -ENODEV;
if (clk->ops.mmap)
err = clk->ops.mmap(clk, vma);
put_posix_clock(clk);
return err;
}
static long posix_clock_ioctl(struct file *fp,
unsigned int cmd, unsigned long arg)
{
struct posix_clock *clk = get_posix_clock(fp);
int err = -ENOTTY;
if (!clk)
return -ENODEV;
if (clk->ops.ioctl)
err = clk->ops.ioctl(clk, cmd, arg);
put_posix_clock(clk);
return err;
}
#ifdef CONFIG_COMPAT
static long posix_clock_compat_ioctl(struct file *fp,
unsigned int cmd, unsigned long arg)
{
struct posix_clock *clk = get_posix_clock(fp);
int err = -ENOTTY;
if (!clk)
return -ENODEV;
if (clk->ops.ioctl)
err = clk->ops.ioctl(clk, cmd, arg);
put_posix_clock(clk);
return err;
}
#endif
static int posix_clock_open(struct inode *inode, struct file *fp)
{
int err;
struct posix_clock *clk =
container_of(inode->i_cdev, struct posix_clock, cdev);
mutex_lock(&clk->mutex);
if (clk->zombie) {
err = -ENODEV;
goto out;
}
if (clk->ops.open)
err = clk->ops.open(clk, fp->f_mode);
else
err = 0;
if (!err) {
kref_get(&clk->kref);
fp->private_data = clk;
}
out:
mutex_unlock(&clk->mutex);
return err;
}
static int posix_clock_release(struct inode *inode, struct file *fp)
{
struct posix_clock *clk = fp->private_data;
int err = 0;
if (clk->ops.release)
err = clk->ops.release(clk);
kref_put(&clk->kref, delete_clock);
fp->private_data = NULL;
return err;
}
static const struct file_operations posix_clock_file_operations = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = posix_clock_read,
.poll = posix_clock_poll,
.unlocked_ioctl = posix_clock_ioctl,
.open = posix_clock_open,
.release = posix_clock_release,
.fasync = posix_clock_fasync,
.mmap = posix_clock_mmap,
#ifdef CONFIG_COMPAT
.compat_ioctl = posix_clock_compat_ioctl,
#endif
};
int posix_clock_register(struct posix_clock *clk, dev_t devid)
{
int err;
kref_init(&clk->kref);
mutex_init(&clk->mutex);
cdev_init(&clk->cdev, &posix_clock_file_operations);
clk->cdev.owner = clk->ops.owner;
err = cdev_add(&clk->cdev, devid, 1);
if (err)
goto no_cdev;
return err;
no_cdev:
mutex_destroy(&clk->mutex);
return err;
}
EXPORT_SYMBOL_GPL(posix_clock_register);
static void delete_clock(struct kref *kref)
{
struct posix_clock *clk = container_of(kref, struct posix_clock, kref);
mutex_destroy(&clk->mutex);
if (clk->release)
clk->release(clk);
}
void posix_clock_unregister(struct posix_clock *clk)
{
cdev_del(&clk->cdev);
mutex_lock(&clk->mutex);
clk->zombie = true;
mutex_unlock(&clk->mutex);
kref_put(&clk->kref, delete_clock);
}
EXPORT_SYMBOL_GPL(posix_clock_unregister);
struct posix_clock_desc {
struct file *fp;
struct posix_clock *clk;
};
static int get_clock_desc(const clockid_t id, struct posix_clock_desc *cd)
{
struct file *fp = fget(CLOCKID_TO_FD(id));
int err = -EINVAL;
if (!fp)
return err;
if (fp->f_op->open != posix_clock_open || !fp->private_data)
goto out;
cd->fp = fp;
cd->clk = get_posix_clock(fp);
err = cd->clk ? 0 : -ENODEV;
out:
if (err)
fput(fp);
return err;
}
static void put_clock_desc(struct posix_clock_desc *cd)
{
put_posix_clock(cd->clk);
fput(cd->fp);
}
static int pc_clock_adjtime(clockid_t id, struct timex *tx)
{
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
err = -EACCES;
goto out;
}
if (cd.clk->ops.clock_adjtime)
err = cd.clk->ops.clock_adjtime(cd.clk, tx);
else
err = -EOPNOTSUPP;
out:
put_clock_desc(&cd);
return err;
}
static int pc_clock_gettime(clockid_t id, struct timespec *ts)
{
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if (cd.clk->ops.clock_gettime)
err = cd.clk->ops.clock_gettime(cd.clk, ts);
else
err = -EOPNOTSUPP;
put_clock_desc(&cd);
return err;
}
static int pc_clock_getres(clockid_t id, struct timespec *ts)
{
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if (cd.clk->ops.clock_getres)
err = cd.clk->ops.clock_getres(cd.clk, ts);
else
err = -EOPNOTSUPP;
put_clock_desc(&cd);
return err;
}
static int pc_clock_settime(clockid_t id, const struct timespec *ts)
{
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
err = -EACCES;
goto out;
}
if (cd.clk->ops.clock_settime)
err = cd.clk->ops.clock_settime(cd.clk, ts);
else
err = -EOPNOTSUPP;
out:
put_clock_desc(&cd);
return err;
}
static int pc_timer_create(struct k_itimer *kit)
{
clockid_t id = kit->it_clock;
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if (cd.clk->ops.timer_create)
err = cd.clk->ops.timer_create(cd.clk, kit);
else
err = -EOPNOTSUPP;
put_clock_desc(&cd);
return err;
}
static int pc_timer_delete(struct k_itimer *kit)
{
clockid_t id = kit->it_clock;
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if (cd.clk->ops.timer_delete)
err = cd.clk->ops.timer_delete(cd.clk, kit);
else
err = -EOPNOTSUPP;
put_clock_desc(&cd);
return err;
}
static void pc_timer_gettime(struct k_itimer *kit, struct itimerspec *ts)
{
clockid_t id = kit->it_clock;
struct posix_clock_desc cd;
if (get_clock_desc(id, &cd))
return;
if (cd.clk->ops.timer_gettime)
cd.clk->ops.timer_gettime(cd.clk, kit, ts);
put_clock_desc(&cd);
}
static int pc_timer_settime(struct k_itimer *kit, int flags,
struct itimerspec *ts, struct itimerspec *old)
{
clockid_t id = kit->it_clock;
struct posix_clock_desc cd;
int err;
err = get_clock_desc(id, &cd);
if (err)
return err;
if (cd.clk->ops.timer_settime)
err = cd.clk->ops.timer_settime(cd.clk, kit, flags, ts, old);
else
err = -EOPNOTSUPP;
put_clock_desc(&cd);
return err;
}
struct k_clock clock_posix_dynamic = {
.clock_getres = pc_clock_getres,
.clock_set = pc_clock_settime,
.clock_get = pc_clock_gettime,
.clock_adj = pc_clock_adjtime,
.timer_create = pc_timer_create,
.timer_set = pc_timer_settime,
.timer_del = pc_timer_delete,
.timer_get = pc_timer_gettime,
};

1
kernel/time/tick-broadcast.c
View File

@ -18,7 +18,6 @@
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include "tick-internal.h"

1
kernel/time/tick-common.c
View File

@ -18,7 +18,6 @@
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <asm/irq_regs.h>

9
kernel/time/tick-internal.h
View File

@ -1,6 +1,10 @@
/*
* tick internal variable and functions used by low/high res code
*/
#include <linux/hrtimer.h>
#include <linux/tick.h>
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
#define TICK_DO_TIMER_NONE -1
#define TICK_DO_TIMER_BOOT -2
@ -135,3 +139,8 @@ static inline int tick_device_is_functional(struct clock_event_device *dev)
{
return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
}
#endif
extern void do_timer(unsigned long ticks);
extern seqlock_t xtime_lock;

1
kernel/time/tick-oneshot.c
View File

@ -18,7 +18,6 @@
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include "tick-internal.h"

1
kernel/time/tick-sched.c
View File

@ -19,7 +19,6 @@
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/module.h>
#include <asm/irq_regs.h>

141
kernel/time/timekeeping.c
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@ -353,7 +353,7 @@ EXPORT_SYMBOL(do_gettimeofday);
*
* Sets the time of day to the new time and update NTP and notify hrtimers
*/
int do_settimeofday(struct timespec *tv)
int do_settimeofday(const struct timespec *tv)
{
struct timespec ts_delta;
unsigned long flags;
@ -387,6 +387,42 @@ int do_settimeofday(struct timespec *tv)
EXPORT_SYMBOL(do_settimeofday);
/**
* timekeeping_inject_offset - Adds or subtracts from the current time.
* @tv: pointer to the timespec variable containing the offset
*
* Adds or subtracts an offset value from the current time.
*/
int timekeeping_inject_offset(struct timespec *ts)
{
unsigned long flags;
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irqsave(&xtime_lock, flags);
timekeeping_forward_now();
xtime = timespec_add(xtime, *ts);
wall_to_monotonic = timespec_sub(wall_to_monotonic, *ts);
timekeeper.ntp_error = 0;
ntp_clear();
update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
timekeeper.mult);
write_sequnlock_irqrestore(&xtime_lock, flags);
/* signal hrtimers about time change */
clock_was_set();
return 0;
}
EXPORT_SYMBOL(timekeeping_inject_offset);
/**
* change_clocksource - Swaps clocksources if a new one is available
*
@ -779,7 +815,7 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
*
* Called from the timer interrupt, must hold a write on xtime_lock.
*/
void update_wall_time(void)
static void update_wall_time(void)
{
struct clocksource *clock;
cycle_t offset;
@ -871,7 +907,7 @@ void update_wall_time(void)
* getboottime - Return the real time of system boot.
* @ts: pointer to the timespec to be set
*
* Returns the time of day in a timespec.
* Returns the wall-time of boot in a timespec.
*
* This is based on the wall_to_monotonic offset and the total suspend
* time. Calls to settimeofday will affect the value returned (which
@ -889,6 +925,55 @@ void getboottime(struct timespec *ts)
}
EXPORT_SYMBOL_GPL(getboottime);
/**
* get_monotonic_boottime - Returns monotonic time since boot
* @ts: pointer to the timespec to be set
*
* Returns the monotonic time since boot in a timespec.
*
* This is similar to CLOCK_MONTONIC/ktime_get_ts, but also
* includes the time spent in suspend.
*/
void get_monotonic_boottime(struct timespec *ts)
{
struct timespec tomono, sleep;
unsigned int seq;
s64 nsecs;
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&xtime_lock);
*ts = xtime;
tomono = wall_to_monotonic;
sleep = total_sleep_time;
nsecs = timekeeping_get_ns();
} while (read_seqretry(&xtime_lock, seq));
set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec,
ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
}
EXPORT_SYMBOL_GPL(get_monotonic_boottime);
/**
* ktime_get_boottime - Returns monotonic time since boot in a ktime
*
* Returns the monotonic time since boot in a ktime
*
* This is similar to CLOCK_MONTONIC/ktime_get, but also
* includes the time spent in suspend.
*/
ktime_t ktime_get_boottime(void)
{
struct timespec ts;
get_monotonic_boottime(&ts);
return timespec_to_ktime(ts);
}
EXPORT_SYMBOL_GPL(ktime_get_boottime);
/**
* monotonic_to_bootbased - Convert the monotonic time to boot based.
* @ts: pointer to the timespec to be converted
@ -910,11 +995,6 @@ struct timespec __current_kernel_time(void)
return xtime;
}
struct timespec __get_wall_to_monotonic(void)
{
return wall_to_monotonic;
}
struct timespec current_kernel_time(void)
{
struct timespec now;
@ -946,3 +1026,48 @@ struct timespec get_monotonic_coarse(void)
now.tv_nsec + mono.tv_nsec);
return now;
}
/*
* The 64-bit jiffies value is not atomic - you MUST NOT read it
* without sampling the sequence number in xtime_lock.
* jiffies is defined in the linker script...
*/
void do_timer(unsigned long ticks)
{
jiffies_64 += ticks;
update_wall_time();
calc_global_load(ticks);
}
/**
* get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic,
* and sleep offsets.
* @xtim: pointer to timespec to be set with xtime
* @wtom: pointer to timespec to be set with wall_to_monotonic
* @sleep: pointer to timespec to be set with time in suspend
*/
void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
struct timespec *wtom, struct timespec *sleep)
{
unsigned long seq;
do {
seq = read_seqbegin(&xtime_lock);
*xtim = xtime;
*wtom = wall_to_monotonic;
*sleep = total_sleep_time;
} while (read_seqretry(&xtime_lock, seq));
}
/**
* xtime_update() - advances the timekeeping infrastructure
* @ticks: number of ticks, that have elapsed since the last call.
*
* Must be called with interrupts disabled.
*/
void xtime_update(unsigned long ticks)
{
write_seqlock(&xtime_lock);
do_timer(ticks);
write_sequnlock(&xtime_lock);
}

13
kernel/timer.c
View File

@ -1324,19 +1324,6 @@ void run_local_timers(void)
raise_softirq(TIMER_SOFTIRQ);
}
/*
* The 64-bit jiffies value is not atomic - you MUST NOT read it
* without sampling the sequence number in xtime_lock.
* jiffies is defined in the linker script...
*/
void do_timer(unsigned long ticks)
{
jiffies_64 += ticks;
update_wall_time();
calc_global_load(ticks);
}
#ifdef __ARCH_WANT_SYS_ALARM
/*

2
security/commoncap.c
View File

@ -93,7 +93,7 @@ int cap_capable(struct task_struct *tsk, const struct cred *cred, int cap,
* Determine whether the current process may set the system clock and timezone
* information, returning 0 if permission granted, -ve if denied.
*/
int cap_settime(struct timespec *ts, struct timezone *tz)
int cap_settime(const struct timespec *ts, const struct timezone *tz)
{
if (!capable(CAP_SYS_TIME))
return -EPERM;

2
security/security.c
View File

@ -201,7 +201,7 @@ int security_syslog(int type)
return security_ops->syslog(type);
}
int security_settime(struct timespec *ts, struct timezone *tz)
int security_settime(const struct timespec *ts, const struct timezone *tz)
{
return security_ops->settime(ts, tz);
}