1 files changed, 74 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index fd52fcb6fa16..437b6f96cc80 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -26,6 +26,7 @@
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>
+#include <linux/pci.h>
 #include <linux/mc146818rtc.h>
 #include <linux/acpi.h>
 #include <linux/sysdev.h>
@@ -41,6 +42,7 @@
 #include <asm/acpi.h>
 #include <asm/dma.h>
 #include <asm/nmi.h>
+#include <asm/msidef.h>
 
 #define __apicdebuginit  __init
 
@@ -1739,6 +1741,78 @@ void destroy_irq(unsigned int irq)
 }
 #endif
 
+/*
+ * MSI mesage composition
+ */
+#ifdef CONFIG_PCI_MSI
+static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+        /* For now always this code always uses physical delivery
+         * mode.
+         */
+        int vector;
+        unsigned dest;
+
+        vector = assign_irq_vector(irq);
+        if (vector >= 0) {
+                cpumask_t tmp;
+
+                cpus_clear(tmp);
+                cpu_set(first_cpu(cpu_online_map), tmp);
+                dest = cpu_mask_to_apicid(tmp);
+
+                msg->address_hi = MSI_ADDR_BASE_HI;
+                msg->address_lo =
+                        MSI_ADDR_BASE_LO |
+                        ((INT_DEST_MODE == 0) ?
+                                MSI_ADDR_DEST_MODE_PHYSICAL:
+                                MSI_ADDR_DEST_MODE_LOGICAL) |
+                        ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+                                MSI_ADDR_REDIRECTION_CPU:
+                                MSI_ADDR_REDIRECTION_LOWPRI) |
+                        MSI_ADDR_DEST_ID(dest);
+
+                msg->data =
+                        MSI_DATA_TRIGGER_EDGE |
+                        MSI_DATA_LEVEL_ASSERT |
+                        ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+                                MSI_DATA_DELIVERY_FIXED:
+                                MSI_DATA_DELIVERY_LOWPRI) |
+                        MSI_DATA_VECTOR(vector);
+        }
+        return vector;
+}
+
+static void msi_msg_teardown(unsigned int irq)
+{
+        return;
+}
+
+static void msi_msg_set_affinity(unsigned int irq, cpumask_t mask, struct msi_msg *msg)
+{
+        int vector;
+        unsigned dest;
+
+        vector = assign_irq_vector(irq);
+        if (vector > 0) {
+                dest = cpu_mask_to_apicid(mask);
+
+                msg->data &= ~MSI_DATA_VECTOR_MASK;
+                msg->data |= MSI_DATA_VECTOR(vector);
+                msg->address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+                msg->address_lo |= MSI_ADDR_DEST_ID(dest);
+        }
+}
+
+struct msi_ops arch_msi_ops = {
+        .needs_64bit_address = 0,
+        .setup = msi_msg_setup,
+        .teardown = msi_msg_teardown,
+        .target = msi_msg_set_affinity,
+};
+
+#endif
+
 /* --------------------------------------------------------------------------
                           ACPI-based IOAPIC Configuration
    -------------------------------------------------------------------------- */