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[patch 01/14] x86/apic: Add a single-target IPI function to the apic

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From: Linus Torvalds <torvalds@linux-foundation.org>

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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/include/asm/apic.h |    1 +
 arch/x86/kernel/smp.c       |   16 ++++++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

Index: linux/arch/x86/include/asm/apic.h
===================================================================
--- linux.orig/arch/x86/include/asm/apic.h
+++ linux/arch/x86/include/asm/apic.h
@@ -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);
Index: linux/arch/x86/kernel/smp.c
===================================================================
--- linux.orig/arch/x86/kernel/smp.c
+++ linux/arch/x86/kernel/smp.c
@@ -115,6 +115,18 @@ static atomic_t stopping_cpu = ATOMIC_IN
 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
  * anything. Worst case is that we lose a reschedule ...
@@ -125,12 +137,12 @@ static void native_smp_send_reschedule(i
 		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)


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Thread

[patch 00/14] x86/apic: Implement single target IPI callback Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
  [patch 06/14] x86/apic: Remove pointless indirections from bigsmp_apic Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic:   Remove pointless indirections from bigsmp_apic tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 01/14] x86/apic: Add a single-target IPI function to the apic Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic:   Add a single-target IPI function to the apic tip-bot for Linus Torvalds <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 05/14] x86/apic: Wire up single IPI for apic_physflat Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic: Wire up single IPI for apic_physflat tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 04/14] x86/apic: Remove pointless indirections from  apic_physflat Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic:   Remove pointless indirections from apic_physflat tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 08/14] x86/apic: Implement single IPI for x2apic_phys Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic: Implement single IPI for x2apic_phys tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 02/14] x86/apic: Implement single target IPI function for  x2apic_cluster Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    Re: [patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster Linus Torvalds <torvalds@linux-foundation.org> - 2015-11-05 08:10 +0100
      Re: [patch 02/14] x86/apic: Implement single target IPI function  for x2apic_cluster Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 09:10 +0100
    Re: [patch 02/14] x86/apic: Implement single target IPI function for  x2apic_cluster Ingo Molnar <mingo@kernel.org> - 2015-11-05 08:10 +0100
    [tip:x86/apic] x86/apic:   Implement single target IPI function for x2apic_cluster tip-bot for Linus Torvalds <tipbot@zytor.com> - 2015-11-05 15:50 +0100
  [patch 10/14] x86/apic: Implement single IPI for apic_noop Thomas Gleixner <tglx@linutronix.de> - 2015-11-05 00:10 +0100
    [tip:x86/apic] x86/apic: Implement single IPI for apic_noop tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2015-11-05 15:50 +0100

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