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remove timer spinlock

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for timer list is operated by per-cpu; and no interrupt
service operates it too. So it's unnecessary for spinlock.

Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Minggui Cao 2018-04-02 12:08:46 +08:00 committed by Jack Ren
parent 3648a0cd6f
commit 8a8b1a47ba
1 changed files with 0 additions and 36 deletions
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36
hypervisor/arch/x86/timer.c
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@ -65,7 +65,6 @@ struct per_cpu_timers {
struct timer *timers_pool; /* it's timers pool for allocation */
uint64_t free_bitmap;
struct list_head timer_list; /* it's for runtime active timer list */
spinlock_t lock;
int cpu_id;
struct timer_statistics stat;
};
@ -85,13 +84,9 @@ static struct timer *alloc_timer(int cpu_id)
struct per_cpu_timers *cpu_timer;
struct timer *timer;
spinlock_rflags;
cpu_timer = &per_cpu(cpu_timers, cpu_id);
spinlock_irqsave_obtain(&cpu_timer->lock);
idx = bitmap_ffs(&cpu_timer->free_bitmap);
if (idx < 0) {
spinlock_irqrestore_release(&cpu_timer->lock);
return NULL;
}
@ -102,7 +97,6 @@ static struct timer *alloc_timer(int cpu_id)
/* assign unique handle and never duplicate */
timer = cpu_timer->timers_pool + idx;
timer->handle = cpu_timer->stat.total_added_cnt;
spinlock_irqrestore_release(&cpu_timer->lock);
ASSERT((cpu_timer->timers_pool[cpu_id].cpu_id == cpu_id),
"timer cpu_id did not match");
@ -113,16 +107,12 @@ static void release_timer(struct timer *timer)
{
struct per_cpu_timers *cpu_timer;
spinlock_rflags;
cpu_timer = &per_cpu(cpu_timers, timer->cpu_id);
timer->priv_data = 0;
timer->func = NULL;
timer->deadline = 0;
spinlock_irqsave_obtain(&cpu_timer->lock);
bitmap_set(timer->id, &cpu_timer->free_bitmap);
cpu_timer->stat.pending_cnt--;
spinlock_irqrestore_release(&cpu_timer->lock);
}
static int get_target_cpu(void)
@ -137,9 +127,6 @@ find_expired_timer(struct per_cpu_timers *cpu_timer, uint64_t tsc_now)
struct timer *timer;
struct list_head *pos;
spinlock_rflags;
spinlock_irqsave_obtain(&cpu_timer->lock);
list_for_each(pos, &cpu_timer->timer_list) {
timer = list_entry(pos, struct timer, node);
if (timer->deadline <= tsc_now)
@ -147,7 +134,6 @@ find_expired_timer(struct per_cpu_timers *cpu_timer, uint64_t tsc_now)
}
timer = NULL;
UNLOCK:
spinlock_irqrestore_release(&cpu_timer->lock);
return timer;
}
@ -191,12 +177,9 @@ _search_timer_by_handle(struct per_cpu_timers *cpu_timer, long handle)
static void
run_timer(struct per_cpu_timers *cpu_timer, struct timer *timer)
{
spinlock_rflags;
/* remove from list first */
spinlock_irqsave_obtain(&cpu_timer->lock);
list_del(&timer->node);
spinlock_irqrestore_release(&cpu_timer->lock);
/* deadline = 0 means stop timer, we should skip */
if (timer->func && timer->deadline != 0UL)
@ -223,15 +206,11 @@ static inline void schedule_next_timer(int cpu)
struct timer *timer;
struct per_cpu_timers *cpu_timer = &per_cpu(cpu_timers, cpu);
spinlock_rflags;
spinlock_irqsave_obtain(&cpu_timer->lock);
timer = _search_nearest_timer(cpu_timer);
if (timer) {
/* it is okay to program a expired time */
msr_write(MSR_IA32_TSC_DEADLINE, timer->deadline);
}
spinlock_irqrestore_release(&cpu_timer->lock);
}
int request_timer_irq(int cpu, dev_handler_t func, void *data, const char *name)
@ -280,7 +259,6 @@ static void init_timer_pool(void)
cpu_timer->free_bitmap = (1UL<<MAX_TIMER_ACTIONS)-1;
INIT_LIST_HEAD(&cpu_timer->timer_list);
spinlock_init(&cpu_timer->lock);
for (j = 0; j < MAX_TIMER_ACTIONS; j++) {
timers_pool[j].id = j;
timers_pool[j].cpu_id = i;
@ -371,8 +349,6 @@ long add_timer(timer_handle_t func, uint64_t data, uint64_t deadline)
struct per_cpu_timers *cpu_timer;
int cpu_id = get_target_cpu();
spinlock_rflags;
if (deadline == 0 || func == NULL)
return -1;
@ -389,12 +365,10 @@ long add_timer(timer_handle_t func, uint64_t data, uint64_t deadline)
cpu_timer = &per_cpu(cpu_timers, timer->cpu_id);
/* We need irqsave here even softirq enabled to protect timer_list */
spinlock_irqsave_obtain(&cpu_timer->lock);
list_add_tail(&timer->node, &cpu_timer->timer_list);
cpu_timer->stat.last.added_id = timer->id;
cpu_timer->stat.last.added_time = rdtsc();
cpu_timer->stat.last.added_deadline = timer->deadline;
spinlock_irqrestore_release(&cpu_timer->lock);
TRACE_4I(TRACE_TIMER_ACTION_ADDED, timer->id, timer->deadline,
timer->deadline >> 32, cpu_timer->stat.total_added_cnt);
@ -413,14 +387,12 @@ update_timer(long handle, timer_handle_t func, uint64_t data,
struct per_cpu_timers *cpu_timer;
int cpu_id = get_target_cpu();
spinlock_rflags;
bool ret = false;
if (deadline == 0)
return -1;
cpu_timer = &per_cpu(cpu_timers, cpu_id);
spinlock_irqsave_obtain(&cpu_timer->lock);
timer = _search_timer_by_handle(cpu_timer, handle);
if (timer) {
/* update deadline and re-sort */
@ -432,7 +404,6 @@ update_timer(long handle, timer_handle_t func, uint64_t data,
cpu_timer->stat.total_added_cnt);
ret = true;
}
spinlock_irqrestore_release(&cpu_timer->lock);
if (ret)
schedule_next_timer(cpu_id);
@ -451,11 +422,9 @@ bool cancel_timer(long handle, int cpu_id)
struct timer *timer;
struct per_cpu_timers *cpu_timer;
spinlock_rflags;
bool ret = false;
cpu_timer = &per_cpu(cpu_timers, cpu_id);
spinlock_irqsave_obtain(&cpu_timer->lock);
timer = _search_timer_by_handle(cpu_timer, handle);
if (timer) {
/* NOTE: we can not directly release timer here.
@ -466,7 +435,6 @@ bool cancel_timer(long handle, int cpu_id)
timer->func = NULL;
ret = true;
}
spinlock_irqrestore_release(&cpu_timer->lock);
return ret;
}
@ -477,8 +445,6 @@ void dump_timer_pool_info(int cpu_id)
struct list_head *pos;
int cn = 0;
spinlock_rflags;
if (cpu_id >= phy_cpu_num)
return;
@ -500,13 +466,11 @@ void dump_timer_pool_info(int cpu_id)
cpu_timer->stat.last.added_time,
cpu_timer->stat.last.added_deadline);
spinlock_irqsave_obtain(&cpu_timer->lock);
list_for_each(pos, &cpu_timer->timer_list) {
cn++;
pr_info("-->pending: %d trigger: 0x%llx", cn,
list_entry(pos, struct timer, node)->deadline);
}
spinlock_irqrestore_release(&cpu_timer->lock);
}
void check_tsc(void)