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x86/apic/x2apic: Implement IPI shorthands support

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All callers of apic->send_IPI_all() and apic->send_IPI_allbutself() contain
the decision logic for shorthand invocation already and invoke
send_IPI_mask() if the prereqisites are not satisfied.

Implement shorthand support for x2apic.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190722105221.134696837@linutronix.de
This commit is contained in:
Thomas Gleixner
2019-07-22 20:47:30 +02:00
parent 2510d09e9d
commit 43931d350f
3 changed files with 13 additions and 4 deletions
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12
arch/x86/kernel/apic/x2apic_phys.c
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@@ -75,12 +75,12 @@ static void
static void x2apic_send_IPI_allbutself(int vector)
{
__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
}
static void x2apic_send_IPI_all(int vector)
{
__x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
__x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
}
static void init_x2apic_ldr(void)
@@ -112,6 +112,14 @@ void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
native_x2apic_icr_write(cfg, apicid);
}
void __x2apic_send_IPI_shorthand(int vector, u32 which)
{
unsigned long cfg = __prepare_ICR(which, vector, 0);
x2apic_wrmsr_fence();
native_x2apic_icr_write(cfg, 0);
}
unsigned int x2apic_get_apic_id(unsigned long id)
{
return id;