[patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster

Thomas Gleixner
2015-11-04T23:01:20Z

[-- Attachment #1: x86-apic--Implement-single-target-IPI-function-for-clustered-apic --]
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From: Linus Torvalds <torvalds@linux-foundation.org>

[ tglx: Split it out from the patch which provides the new callback
and wrapped it into local_irq_save/restore ]

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/x2apic_cluster.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

Index: linux/arch/x86/kernel/apic/x2apic_cluster.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_cluster.c
+++ linux/arch/x86/kernel/apic/x2apic_cluster.c
@@ -23,6 +23,17 @@ static inline u32 x2apic_cluster(int cpu
return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
}

+static void x2apic_send_IPI(int cpu, int vector)
+{
+ u32 dest = per_cpu(x86_cpu_to_logical_apicid, cpu);
+ unsigned long flags;
+
+ x2apic_wrmsr_fence();
+ local_irq_save(flags);
+ __x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL);
+ local_irq_restore(flags);
+}
+
static void
__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
{
@@ -266,6 +277,7 @@ static struct apic apic_x2apic_cluster =

.cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,

+ .send_IPI = x2apic_send_IPI,
.send_IPI_mask = x2apic_send_IPI_mask,
.send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
.send_IPI_allbutself = x2apic_send_IPI_allbutself,