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x86/apic: Add a single-target IPI function to the apic 

We still fall back on the "send mask" versions if an apic definition
doesn't have the single-target version, but at least this allows the
(trivial) case for the common clustered x2apic case.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Travis <travis@sgi.com>
Cc: Daniel J Blueman <daniel@numascale.com>
Link: http://lkml.kernel.org/r/20151104220848.737120838@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Linus Torvalds 2015-11-04 22:57:00 +00:00 committed by Thomas Gleixner
parent 66ef3493d4
commit 539da78772
2 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/apic.h
View File

@ -303,6 +303,7 @@ struct apic {
unsigned int *apicid);
/* ipi */
void (*send_IPI)(int cpu, int vector);
void (*send_IPI_mask)(const struct cpumask *mask, int vector);
void (*send_IPI_mask_allbutself)(const struct cpumask *mask,
int vector);

16
arch/x86/kernel/smp.c
View File

@ -114,6 +114,18 @@
static atomic_t stopping_cpu = ATOMIC_INIT(-1);
static bool smp_no_nmi_ipi = false;
/*
* Helper wrapper: not all apic definitions support sending to
* a single CPU, so we fall back to sending to a mask.
*/
static void send_IPI_cpu(int cpu, int vector)
{
if (apic->send_IPI)
apic->send_IPI(cpu, vector);
else
apic->send_IPI_mask(cpumask_of(cpu), vector);
}
/*
* this function sends a 'reschedule' IPI to another CPU.
* it goes straight through and wastes no time serializing
@ -125,12 +137,12 @@ static void native_smp_send_reschedule(int cpu)
WARN_ON(1);
return;
}
apic->send_IPI_mask(cpumask_of(cpu), RESCHEDULE_VECTOR);
send_IPI_cpu(cpu, RESCHEDULE_VECTOR);
}
void native_send_call_func_single_ipi(int cpu)
{
apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR);
send_IPI_cpu(cpu, CALL_FUNCTION_SINGLE_VECTOR);
}
void native_send_call_func_ipi(const struct cpumask *mask)