Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 539da787 authored by Linus Torvalds's avatar Linus Torvalds Committed by Thomas Gleixner
Browse files

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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: default avatarIngo 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent 66ef3493

arch/x86/include/asm/apic.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

arch/x86/kernel/smp.c

+14 −2
Original line number Diff line number Diff line
@@ -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)