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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

浏览代码 
* '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
这个提交包含在：
Linus Torvalds
2011-03-15 18:53:35 -07:00
父节点 9620639b7e 6e6823d17b
当前提交 420c1c572d
共修改 56 个文件，包含 1276 行新增和 508 行删除
下载 Patch 文件 下载 Diff 文件 展开所有文件 折叠所有文件

136
kernel/compat.c
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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 @@ retry:
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 @@ retry:
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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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 普通文件
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
查看文件

@@ -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
/*