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2bcc673101
Pull timer updates from Thomas Gleixner:
"Yet another big pile of changes:
- More year 2038 work from Arnd slowly reaching the point where we
need to think about the syscalls themself.
- A new timer function which allows to conditionally (re)arm a timer
only when it's either not running or the new expiry time is sooner
than the armed expiry time. This allows to use a single timer for
multiple timeout requirements w/o caring about the first expiry
time at the call site.
- A new NMI safe accessor to clock real time for the printk timestamp
work. Can be used by tracing, perf as well if required.
- A large number of timer setup conversions from Kees which got
collected here because either maintainers requested so or they
simply got ignored. As Kees pointed out already there are a few
trivial merge conflicts and some redundant commits which was
unavoidable due to the size of this conversion effort.
- Avoid a redundant iteration in the timer wheel softirq processing.
- Provide a mechanism to treat RTC implementations depending on their
hardware properties, i.e. don't inflict the write at the 0.5
seconds boundary which originates from the PC CMOS RTC to all RTCs.
No functional change as drivers need to be updated separately.
- The usual small updates to core code clocksource drivers. Nothing
really exciting"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (111 commits)
timers: Add a function to start/reduce a timer
pstore: Use ktime_get_real_fast_ns() instead of __getnstimeofday()
timer: Prepare to change all DEFINE_TIMER() callbacks
netfilter: ipvs: Convert timers to use timer_setup()
scsi: qla2xxx: Convert timers to use timer_setup()
block/aoe: discover_timer: Convert timers to use timer_setup()
ide: Convert timers to use timer_setup()
drbd: Convert timers to use timer_setup()
mailbox: Convert timers to use timer_setup()
crypto: Convert timers to use timer_setup()
drivers/pcmcia: omap1: Fix error in automated timer conversion
ARM: footbridge: Fix typo in timer conversion
drivers/sgi-xp: Convert timers to use timer_setup()
drivers/pcmcia: Convert timers to use timer_setup()
drivers/memstick: Convert timers to use timer_setup()
drivers/macintosh: Convert timers to use timer_setup()
hwrng/xgene-rng: Convert timers to use timer_setup()
auxdisplay: Convert timers to use timer_setup()
sparc/led: Convert timers to use timer_setup()
mips: ip22/32: Convert timers to use timer_setup()
...
258 lines
8.3 KiB
C
258 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TIMER_H
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#define _LINUX_TIMER_H
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#include <linux/list.h>
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#include <linux/ktime.h>
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#include <linux/stddef.h>
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#include <linux/debugobjects.h>
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#include <linux/stringify.h>
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struct tvec_base;
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struct timer_list {
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/*
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* All fields that change during normal runtime grouped to the
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* same cacheline
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*/
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struct hlist_node entry;
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unsigned long expires;
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void (*function)(unsigned long);
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unsigned long data;
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u32 flags;
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#ifdef CONFIG_LOCKDEP
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struct lockdep_map lockdep_map;
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#endif
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};
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#ifdef CONFIG_LOCKDEP
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/*
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* NB: because we have to copy the lockdep_map, setting the lockdep_map key
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* (second argument) here is required, otherwise it could be initialised to
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* the copy of the lockdep_map later! We use the pointer to and the string
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* "<file>:<line>" as the key resp. the name of the lockdep_map.
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*/
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#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \
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.lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
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#else
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#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
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#endif
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/*
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* A deferrable timer will work normally when the system is busy, but
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* will not cause a CPU to come out of idle just to service it; instead,
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* the timer will be serviced when the CPU eventually wakes up with a
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* subsequent non-deferrable timer.
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*
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* An irqsafe timer is executed with IRQ disabled and it's safe to wait for
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* the completion of the running instance from IRQ handlers, for example,
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* by calling del_timer_sync().
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*
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* Note: The irq disabled callback execution is a special case for
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* workqueue locking issues. It's not meant for executing random crap
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* with interrupts disabled. Abuse is monitored!
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*/
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#define TIMER_CPUMASK 0x0003FFFF
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#define TIMER_MIGRATING 0x00040000
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#define TIMER_BASEMASK (TIMER_CPUMASK | TIMER_MIGRATING)
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#define TIMER_DEFERRABLE 0x00080000
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#define TIMER_PINNED 0x00100000
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#define TIMER_IRQSAFE 0x00200000
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#define TIMER_ARRAYSHIFT 22
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#define TIMER_ARRAYMASK 0xFFC00000
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#define TIMER_TRACE_FLAGMASK (TIMER_MIGRATING | TIMER_DEFERRABLE | TIMER_PINNED | TIMER_IRQSAFE)
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#define TIMER_DATA_TYPE unsigned long
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#define TIMER_FUNC_TYPE void (*)(TIMER_DATA_TYPE)
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#define __TIMER_INITIALIZER(_function, _data, _flags) { \
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.entry = { .next = TIMER_ENTRY_STATIC }, \
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.function = (_function), \
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.data = (_data), \
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.flags = (_flags), \
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__TIMER_LOCKDEP_MAP_INITIALIZER( \
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__FILE__ ":" __stringify(__LINE__)) \
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}
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#define DEFINE_TIMER(_name, _function) \
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struct timer_list _name = \
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__TIMER_INITIALIZER((TIMER_FUNC_TYPE)_function, 0, 0)
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void init_timer_key(struct timer_list *timer, unsigned int flags,
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const char *name, struct lock_class_key *key);
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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
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extern void init_timer_on_stack_key(struct timer_list *timer,
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unsigned int flags, const char *name,
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struct lock_class_key *key);
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extern void destroy_timer_on_stack(struct timer_list *timer);
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#else
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static inline void destroy_timer_on_stack(struct timer_list *timer) { }
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static inline void init_timer_on_stack_key(struct timer_list *timer,
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unsigned int flags, const char *name,
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struct lock_class_key *key)
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{
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init_timer_key(timer, flags, name, key);
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}
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#endif
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#ifdef CONFIG_LOCKDEP
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#define __init_timer(_timer, _flags) \
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do { \
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static struct lock_class_key __key; \
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init_timer_key((_timer), (_flags), #_timer, &__key); \
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} while (0)
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#define __init_timer_on_stack(_timer, _flags) \
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do { \
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static struct lock_class_key __key; \
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init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \
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} while (0)
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#else
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#define __init_timer(_timer, _flags) \
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init_timer_key((_timer), (_flags), NULL, NULL)
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#define __init_timer_on_stack(_timer, _flags) \
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init_timer_on_stack_key((_timer), (_flags), NULL, NULL)
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#endif
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#define init_timer(timer) \
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__init_timer((timer), 0)
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#define __setup_timer(_timer, _fn, _data, _flags) \
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do { \
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__init_timer((_timer), (_flags)); \
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(_timer)->function = (_fn); \
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(_timer)->data = (_data); \
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} while (0)
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#define __setup_timer_on_stack(_timer, _fn, _data, _flags) \
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do { \
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__init_timer_on_stack((_timer), (_flags)); \
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(_timer)->function = (_fn); \
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(_timer)->data = (_data); \
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} while (0)
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#define setup_timer(timer, fn, data) \
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__setup_timer((timer), (fn), (data), 0)
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#define setup_pinned_timer(timer, fn, data) \
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__setup_timer((timer), (fn), (data), TIMER_PINNED)
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#define setup_deferrable_timer(timer, fn, data) \
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__setup_timer((timer), (fn), (data), TIMER_DEFERRABLE)
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#define setup_pinned_deferrable_timer(timer, fn, data) \
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__setup_timer((timer), (fn), (data), TIMER_DEFERRABLE | TIMER_PINNED)
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#define setup_timer_on_stack(timer, fn, data) \
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__setup_timer_on_stack((timer), (fn), (data), 0)
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#define setup_pinned_timer_on_stack(timer, fn, data) \
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__setup_timer_on_stack((timer), (fn), (data), TIMER_PINNED)
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#define setup_deferrable_timer_on_stack(timer, fn, data) \
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__setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE)
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#define setup_pinned_deferrable_timer_on_stack(timer, fn, data) \
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__setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE | TIMER_PINNED)
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#ifndef CONFIG_LOCKDEP
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static inline void timer_setup(struct timer_list *timer,
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void (*callback)(struct timer_list *),
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unsigned int flags)
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{
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__setup_timer(timer, (TIMER_FUNC_TYPE)callback,
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(TIMER_DATA_TYPE)timer, flags);
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}
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static inline void timer_setup_on_stack(struct timer_list *timer,
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void (*callback)(struct timer_list *),
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unsigned int flags)
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{
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__setup_timer_on_stack(timer, (TIMER_FUNC_TYPE)callback,
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(TIMER_DATA_TYPE)timer, flags);
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}
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#else
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/*
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* Under LOCKDEP, the timer lock_class_key (set up in __init_timer) needs
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* to be tied to the caller's context, so an inline (above) won't work. We
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* do want to keep the inline for argument type checking, though.
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*/
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# define timer_setup(timer, callback, flags) \
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__setup_timer((timer), (TIMER_FUNC_TYPE)(callback), \
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(TIMER_DATA_TYPE)(timer), (flags))
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# define timer_setup_on_stack(timer, callback, flags) \
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__setup_timer_on_stack((timer), \
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(TIMER_FUNC_TYPE)(callback), \
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(TIMER_DATA_TYPE)(timer), (flags))
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#endif
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#define from_timer(var, callback_timer, timer_fieldname) \
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container_of(callback_timer, typeof(*var), timer_fieldname)
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/**
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* timer_pending - is a timer pending?
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* @timer: the timer in question
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*
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* timer_pending will tell whether a given timer is currently pending,
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* or not. Callers must ensure serialization wrt. other operations done
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* to this timer, eg. interrupt contexts, or other CPUs on SMP.
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*
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* return value: 1 if the timer is pending, 0 if not.
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*/
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static inline int timer_pending(const struct timer_list * timer)
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{
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return timer->entry.pprev != NULL;
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}
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extern void add_timer_on(struct timer_list *timer, int cpu);
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extern int del_timer(struct timer_list * timer);
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extern int mod_timer(struct timer_list *timer, unsigned long expires);
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extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
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extern int timer_reduce(struct timer_list *timer, unsigned long expires);
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/*
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* The jiffies value which is added to now, when there is no timer
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* in the timer wheel:
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*/
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#define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1)
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extern void add_timer(struct timer_list *timer);
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extern int try_to_del_timer_sync(struct timer_list *timer);
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#ifdef CONFIG_SMP
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extern int del_timer_sync(struct timer_list *timer);
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#else
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# define del_timer_sync(t) del_timer(t)
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#endif
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#define del_singleshot_timer_sync(t) del_timer_sync(t)
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extern void init_timers(void);
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extern void run_local_timers(void);
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struct hrtimer;
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extern enum hrtimer_restart it_real_fn(struct hrtimer *);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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struct ctl_table;
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extern unsigned int sysctl_timer_migration;
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int timer_migration_handler(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos);
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#endif
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unsigned long __round_jiffies(unsigned long j, int cpu);
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unsigned long __round_jiffies_relative(unsigned long j, int cpu);
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unsigned long round_jiffies(unsigned long j);
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unsigned long round_jiffies_relative(unsigned long j);
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unsigned long __round_jiffies_up(unsigned long j, int cpu);
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unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
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unsigned long round_jiffies_up(unsigned long j);
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unsigned long round_jiffies_up_relative(unsigned long j);
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#ifdef CONFIG_HOTPLUG_CPU
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int timers_dead_cpu(unsigned int cpu);
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#else
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#define timers_dead_cpu NULL
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#endif
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#endif
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