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Diffstat (limited to 'arch/ia64/kernel/msi_ia64.c')
-rw-r--r--arch/ia64/kernel/msi_ia64.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 60c6ef67ebb2..702a09c13238 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -5,6 +5,7 @@
#include <linux/pci.h>
#include <linux/irq.h>
#include <linux/msi.h>
+#include <linux/dmar.h>
#include <asm/smp.h>
/*
@@ -162,3 +163,82 @@ void arch_teardown_msi_irq(unsigned int irq)
return ia64_teardown_msi_irq(irq);
}
+
+#ifdef CONFIG_DMAR
+#ifdef CONFIG_SMP
+static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ struct msi_msg msg;
+ int cpu = first_cpu(mask);
+
+
+ if (!cpu_online(cpu))
+ return;
+
+ if (irq_prepare_move(irq, cpu))
+ return;
+
+ dmar_msi_read(irq, &msg);
+
+ msg.data &= ~MSI_DATA_VECTOR_MASK;
+ msg.data |= MSI_DATA_VECTOR(cfg->vector);
+ msg.address_lo &= ~MSI_ADDR_DESTID_MASK;
+ msg.address_lo |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));
+
+ dmar_msi_write(irq, &msg);
+ irq_desc[irq].affinity = mask;
+}
+#endif /* CONFIG_SMP */
+
+struct irq_chip dmar_msi_type = {
+ .name = "DMAR_MSI",
+ .unmask = dmar_msi_unmask,
+ .mask = dmar_msi_mask,
+ .ack = ia64_ack_msi_irq,
+#ifdef CONFIG_SMP
+ .set_affinity = dmar_msi_set_affinity,
+#endif
+ .retrigger = ia64_msi_retrigger_irq,
+};
+
+static int
+msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+ struct irq_cfg *cfg = irq_cfg + irq;
+ unsigned dest;
+ cpumask_t mask;
+
+ cpus_and(mask, irq_to_domain(irq), cpu_online_map);
+ dest = cpu_physical_id(first_cpu(mask));
+
+ msg->address_hi = 0;
+ msg->address_lo =
+ MSI_ADDR_HEADER |
+ MSI_ADDR_DESTMODE_PHYS |
+ MSI_ADDR_REDIRECTION_CPU |
+ MSI_ADDR_DESTID_CPU(dest);
+
+ msg->data =
+ MSI_DATA_TRIGGER_EDGE |
+ MSI_DATA_LEVEL_ASSERT |
+ MSI_DATA_DELIVERY_FIXED |
+ MSI_DATA_VECTOR(cfg->vector);
+ return 0;
+}
+
+int arch_setup_dmar_msi(unsigned int irq)
+{
+ int ret;
+ struct msi_msg msg;
+
+ ret = msi_compose_msg(NULL, irq, &msg);
+ if (ret < 0)
+ return ret;
+ dmar_msi_write(irq, &msg);
+ set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
+ "edge");
+ return 0;
+}
+#endif /* CONFIG_DMAR */
+