xen: implement apic ipi interface

Map native ipi vector to xen vector.
Implement apic ipi interface with xen_send_IPI_one.

Tested-by: Steven Noonan <steven@uplinklabs.net>
Signed-off-by: Ben Guthro <ben@guthro.net>
Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

3 files changed, 98 insertions, 4 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 4f51bebac02c..1ed61c2bf633 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -74,6 +74,7 @@
 
 #include "xen-ops.h"
 #include "mmu.h"
+#include "smp.h"
 #include "multicalls.h"
 
 EXPORT_SYMBOL_GPL(hypercall_page);
@@ -849,6 +850,14 @@ static void set_xen_basic_apic_ops(void)
         apic->icr_write = xen_apic_icr_write;
         apic->wait_icr_idle = xen_apic_wait_icr_idle;
         apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle;
+
+#ifdef CONFIG_SMP
+        apic->send_IPI_allbutself = xen_send_IPI_allbutself;
+        apic->send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself;
+        apic->send_IPI_mask = xen_send_IPI_mask;
+        apic->send_IPI_all = xen_send_IPI_all;
+        apic->send_IPI_self = xen_send_IPI_self;
+#endif
 }
 
 #endif
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 5fac6919b957..2dc6628c1520 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -465,8 +465,8 @@ static void xen_smp_send_reschedule(int cpu)
         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
 }
 
-static void xen_send_IPI_mask(const struct cpumask *mask,
-                              enum ipi_vector vector)
+static void __xen_send_IPI_mask(const struct cpumask *mask,
+                              int vector)
 {
         unsigned cpu;
 
@@ -478,7 +478,7 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 {
         int cpu;
 
-        xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
+        __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
 
         /* Make sure other vcpus get a chance to run if they need to. */
         for_each_cpu(cpu, mask) {
@@ -491,10 +491,83 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 
 static void xen_smp_send_call_function_single_ipi(int cpu)
 {
-        xen_send_IPI_mask(cpumask_of(cpu),
+        __xen_send_IPI_mask(cpumask_of(cpu),
                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
 }
 
+static inline int xen_map_vector(int vector)
+{
+        int xen_vector;
+
+        switch (vector) {
+        case RESCHEDULE_VECTOR:
+                xen_vector = XEN_RESCHEDULE_VECTOR;
+                break;
+        case CALL_FUNCTION_VECTOR:
+                xen_vector = XEN_CALL_FUNCTION_VECTOR;
+                break;
+        case CALL_FUNCTION_SINGLE_VECTOR:
+                xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
+                break;
+        default:
+                xen_vector = -1;
+                printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
+                        vector);
+        }
+
+        return xen_vector;
+}
+
+void xen_send_IPI_mask(const struct cpumask *mask,
+                              int vector)
+{
+        int xen_vector = xen_map_vector(vector);
+
+        if (xen_vector >= 0)
+                __xen_send_IPI_mask(mask, xen_vector);
+}
+
+void xen_send_IPI_all(int vector)
+{
+        int xen_vector = xen_map_vector(vector);
+
+        if (xen_vector >= 0)
+                __xen_send_IPI_mask(cpu_online_mask, xen_vector);
+}
+
+void xen_send_IPI_self(int vector)
+{
+        int xen_vector = xen_map_vector(vector);
+
+        if (xen_vector >= 0)
+                xen_send_IPI_one(smp_processor_id(), xen_vector);
+}
+
+void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
+                                int vector)
+{
+        unsigned cpu;
+        unsigned int this_cpu = smp_processor_id();
+
+        if (!(num_online_cpus() > 1))
+                return;
+
+        for_each_cpu_and(cpu, mask, cpu_online_mask) {
+                if (this_cpu == cpu)
+                        continue;
+
+                xen_smp_send_call_function_single_ipi(cpu);
+        }
+}
+
+void xen_send_IPI_allbutself(int vector)
+{
+        int xen_vector = xen_map_vector(vector);
+
+        if (xen_vector >= 0)
+                xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
+}
+
 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 {
         irq_enter();
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
new file mode 100644
index 000000000000..8981a76d081a
--- /dev/null
+++ b/arch/x86/xen/smp.h
@@ -0,0 +1,12 @@
+#ifndef _XEN_SMP_H
+
+extern void xen_send_IPI_mask(const struct cpumask *mask,
+                              int vector);
+extern void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
+                                int vector);
+extern void xen_send_IPI_allbutself(int vector);
+extern void physflat_send_IPI_allbutself(int vector);
+extern void xen_send_IPI_all(int vector);
+extern void xen_send_IPI_self(int vector);
+
+#endif