1 files changed, 108 insertions, 4 deletions

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 3700945ed0d5..afb250d22a6b 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -16,6 +16,7 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/smp.h>
+#include <linux/irq_work.h>
 
 #include <asm/paravirt.h>
 #include <asm/desc.h>
@@ -41,10 +42,12 @@ cpumask_var_t xen_cpu_initialized_map;
 static DEFINE_PER_CPU(int, xen_resched_irq);
 static DEFINE_PER_CPU(int, xen_callfunc_irq);
 static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
+static DEFINE_PER_CPU(int, xen_irq_work);
 static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
 
 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
 
 /*
  * Reschedule call back.
@@ -143,6 +146,17 @@ static int xen_smp_intr_init(unsigned int cpu)
                 goto fail;
         per_cpu(xen_callfuncsingle_irq, cpu) = rc;
 
+        callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
+        rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
+                                    cpu,
+                                    xen_irq_work_interrupt,
+                                    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
+                                    callfunc_name,
+                                    NULL);
+        if (rc < 0)
+                goto fail;
+        per_cpu(xen_irq_work, cpu) = rc;
+
         return 0;
 
  fail:
@@ -155,6 +169,8 @@ static int xen_smp_intr_init(unsigned int cpu)
         if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
                                        NULL);
+        if (per_cpu(xen_irq_work, cpu) >= 0)
+                unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
 
         return rc;
 }
@@ -407,6 +423,7 @@ static void xen_cpu_die(unsigned int cpu)
         unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
         unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
         unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
+        unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
         xen_uninit_lock_cpu(cpu);
         xen_teardown_timer(cpu);
 
@@ -469,8 +486,8 @@ 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;
 
@@ -482,7 +499,7 @@ 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) {
@@ -495,10 +512,86 @@ 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;
+        case IRQ_WORK_VECTOR:
+                xen_vector = XEN_IRQ_WORK_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();
@@ -519,6 +612,16 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
+static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
+{
+        irq_enter();
+        irq_work_run();
+        inc_irq_stat(apic_irq_work_irqs);
+        irq_exit();
+
+        return IRQ_HANDLED;
+}
+
 static const struct smp_ops xen_smp_ops __initconst = {
         .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
         .smp_prepare_cpus = xen_smp_prepare_cpus,
@@ -565,6 +668,7 @@ static void xen_hvm_cpu_die(unsigned int cpu)
         unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
         unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
         unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
+        unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
         native_cpu_die(cpu);
 }