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x86/apic: Provide and use helper for send_IPI_allbutself()

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To support IPI shorthands wrap invocations of apic->send_IPI_allbutself()
in a helper function, so the static key controlling the shorthand mode is
only in one place.

Fixup all callers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190722105220.492691679@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-07-22 20:47:23 +02:00
parent 6a1cb5f5c6
commit 22ca7ee933
5 changed files with 18 additions and 9 deletions
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2
arch/x86/include/asm/apic.h
View File

@ -177,6 +177,8 @@ extern void lapic_online(void);
extern void lapic_offline(void);
extern bool apic_needs_pit(void);
extern void apic_send_IPI_allbutself(unsigned int vector);
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }
#define local_apic_timer_c2_ok 1

12
arch/x86/kernel/apic/ipi.c
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@ -50,6 +50,18 @@ void apic_smt_update(void)
static_branch_enable(&apic_use_ipi_shorthand);
}
}
void apic_send_IPI_allbutself(unsigned int vector)
{
if (num_online_cpus() < 2)
return;
if (static_branch_likely(&apic_use_ipi_shorthand))
apic->send_IPI_allbutself(vector);
else
apic->send_IPI_mask_allbutself(cpu_online_mask, vector);
}
#endif /* CONFIG_SMP */
static inline int __prepare_ICR2(unsigned int mask)

2
arch/x86/kernel/kgdb.c
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@ -416,7 +416,7 @@ static void kgdb_disable_hw_debug(struct pt_regs *regs)
*/
void kgdb_roundup_cpus(void)
{
apic->send_IPI_allbutself(NMI_VECTOR);
apic_send_IPI_allbutself(NMI_VECTOR);
}
#endif

7
arch/x86/kernel/reboot.c
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@ -828,11 +828,6 @@ static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
return NMI_HANDLED;
}
static void smp_send_nmi_allbutself(void)
{
apic->send_IPI_allbutself(NMI_VECTOR);
}
/*
* Halt all other CPUs, calling the specified function on each of them
*
@ -861,7 +856,7 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
*/
wmb();
smp_send_nmi_allbutself();
apic_send_IPI_allbutself(NMI_VECTOR);
/* Kick CPUs looping in NMI context. */
WRITE_ONCE(crash_ipi_issued, 1);

4
arch/x86/kernel/smp.c
View File

@ -215,7 +215,7 @@ static void native_stop_other_cpus(int wait)
/* sync above data before sending IRQ */
wmb();
apic->send_IPI_allbutself(REBOOT_VECTOR);
apic_send_IPI_allbutself(REBOOT_VECTOR);
/*
* Don't wait longer than a second for IPI completion. The
@ -241,7 +241,7 @@ static void native_stop_other_cpus(int wait)
pr_emerg("Shutting down cpus with NMI\n");
apic->send_IPI_allbutself(NMI_VECTOR);
apic_send_IPI_allbutself(NMI_VECTOR);
}
/*
* Don't wait longer than 10 ms if the caller didn't