1 files changed, 75 insertions, 2 deletions

diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 2de5a3238c94..f78371b22529 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -5,6 +5,7 @@
 #include <linux/pci.h>
 #include <linux/irq.h>
 #include <asm/io_apic.h>
+#include <asm/smp.h>
 #include <linux/intel-iommu.h>
 #include "intr_remapping.h"
 
@@ -19,17 +20,75 @@ struct irq_2_iommu {
         u8  irte_mask;
 };
 
-static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_2_iommu *get_one_free_irq_2_iommu(int cpu)
+{
+        struct irq_2_iommu *iommu;
+        int node;
+
+        node = cpu_to_node(cpu);
+
+        iommu = kzalloc_node(sizeof(*iommu), GFP_ATOMIC, node);
+        printk(KERN_DEBUG "alloc irq_2_iommu on cpu %d node %d\n", cpu, node);
+
+        return iommu;
+}
 
 static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
 {
-        return (irq < nr_irqs) ? irq_2_iommuX + irq : NULL;
+        struct irq_desc *desc;
+
+        desc = irq_to_desc(irq);
+
+        if (WARN_ON_ONCE(!desc))
+                return NULL;
+
+        return desc->irq_2_iommu;
+}
+
+static struct irq_2_iommu *irq_2_iommu_alloc_cpu(unsigned int irq, int cpu)
+{
+        struct irq_desc *desc;
+        struct irq_2_iommu *irq_iommu;
+
+        /*
+         * alloc irq desc if not allocated already.
+         */
+        desc = irq_to_desc_alloc_cpu(irq, cpu);
+        if (!desc) {
+                printk(KERN_INFO "can not get irq_desc for %d\n", irq);
+                return NULL;
+        }
+
+        irq_iommu = desc->irq_2_iommu;
+
+        if (!irq_iommu)
+                desc->irq_2_iommu = get_one_free_irq_2_iommu(cpu);
+
+        return desc->irq_2_iommu;
 }
 
 static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
 {
+        return irq_2_iommu_alloc_cpu(irq, boot_cpu_id);
+}
+
+#else /* !CONFIG_SPARSE_IRQ */
+
+static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
+
+static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
+{
+        if (irq < nr_irqs)
+                return &irq_2_iommuX[irq];
+
+        return NULL;
+}
+static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
+{
         return irq_2_iommu(irq);
 }
+#endif
 
 static DEFINE_SPINLOCK(irq_2_ir_lock);
 
@@ -86,9 +145,11 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
         if (!count)
                 return -1;
 
+#ifndef CONFIG_SPARSE_IRQ
         /* protect irq_2_iommu_alloc later */
         if (irq >= nr_irqs)
                 return -1;
+#endif
 
         /*
          * start the IRTE search from index 0.
@@ -130,6 +191,12 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
                 table->base[i].present = 1;
 
         irq_iommu = irq_2_iommu_alloc(irq);
+        if (!irq_iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                printk(KERN_ERR "can't allocate irq_2_iommu\n");
+                return -1;
+        }
+
         irq_iommu->iommu = iommu;
         irq_iommu->irte_index =  index;
         irq_iommu->sub_handle = 0;
@@ -177,6 +244,12 @@ int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
 
         irq_iommu = irq_2_iommu_alloc(irq);
 
+        if (!irq_iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                printk(KERN_ERR "can't allocate irq_2_iommu\n");
+                return -1;
+        }
+
         irq_iommu->iommu = iommu;
         irq_iommu->irte_index = index;
         irq_iommu->sub_handle = subhandle;