x86/apic: Implement single IPI for x2apic_phys

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.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/20151104220849.296438009@linutronix.de

diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index 662e9150ea6f29e6c050ce76d719ed3d77385148..a1242e2c12e646d4eb2b805e4359ce9068e4db56 100644 (file)
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -36,6 +36,14 @@ static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
        return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
 }
 
+static void x2apic_send_IPI(int cpu, int vector)
+{
+       u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
+
+       x2apic_wrmsr_fence();
+       __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
+}
+
 static void
 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
 {
@@ -122,6 +130,7 @@ static struct apic apic_x2apic_phys = {
 
        .cpu_mask_to_apicid_and         = default_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,