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s390/irq,idle: simplify idle check 

Use the per-cpu CIF_ENABLED_WAIT flag to decide if an interrupt
occurred while a cpu was idle, instead of checking two conditions
within the old psw.

Also move clearing of the CIF_ENABLED_WAIT bit to the early interrupt
handler, which in turn makes arch_vcpu_is_preempted() also a bit more
precise, since the flag is now cleared before interrupt handlers have
been called.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-02-13 12:35:19 +01:00
parent f96f41aae2
commit 6472a2dcc4
3 changed files with 4 additions and 6 deletions
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1
arch/s390/include/asm/idle.h
View File

@ -23,6 +23,5 @@ extern struct device_attribute dev_attr_idle_count;
extern struct device_attribute dev_attr_idle_time_us;
void psw_idle(struct s390_idle_data *data, unsigned long psw_mask);
void psw_idle_exit(void);
#endif /* _S390_IDLE_H */

1
arch/s390/kernel/idle.c
View File

@ -28,7 +28,6 @@ void account_idle_time_irq(void)
u64 cycles_new[8];
int i;
clear_cpu_flag(CIF_ENABLED_WAIT);
if (smp_cpu_mtid) {
stcctm(MT_DIAG, smp_cpu_mtid, cycles_new);
for (i = 0; i < smp_cpu_mtid; i++)

8
arch/s390/kernel/irq.c
View File

@ -136,7 +136,7 @@ void noinstr do_io_irq(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
struct pt_regs *old_regs = set_irq_regs(regs);
int from_idle;
bool from_idle;
irq_enter_rcu();
@ -146,7 +146,7 @@ void noinstr do_io_irq(struct pt_regs *regs)
current->thread.last_break = regs->last_break;
}
from_idle = !user_mode(regs) && regs->psw.addr == (unsigned long)psw_idle_exit;
from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
if (from_idle)
account_idle_time_irq();
@ -171,7 +171,7 @@ void noinstr do_ext_irq(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
struct pt_regs *old_regs = set_irq_regs(regs);
int from_idle;
bool from_idle;
irq_enter_rcu();
@ -185,7 +185,7 @@ void noinstr do_ext_irq(struct pt_regs *regs)
regs->int_parm = S390_lowcore.ext_params;
regs->int_parm_long = S390_lowcore.ext_params2;
from_idle = !user_mode(regs) && regs->psw.addr == (unsigned long)psw_idle_exit;
from_idle = test_and_clear_cpu_flag(CIF_ENABLED_WAIT);
if (from_idle)
account_idle_time_irq();