iommu/amd: Add initialization routines for AMD interrupt remapping

Add the six routines required to setup interrupt remapping
with the AMD IOMMU. Also put it all together into the AMD
specific irq_remap_ops.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

4 files changed, 67 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index aeb890c35f7..33f144f7d67 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -45,6 +45,7 @@
 
 #include "amd_iommu_proto.h"
 #include "amd_iommu_types.h"
+#include "irq_remapping.h"
 
 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
 
@@ -4226,4 +4227,19 @@ static int setup_hpet_msi(unsigned int irq, unsigned int id)
         return 0;
 }
 
+struct irq_remap_ops amd_iommu_irq_ops = {
+        .supported              = amd_iommu_supported,
+        .prepare                = amd_iommu_prepare,
+        .enable                 = amd_iommu_enable,
+        .disable                = amd_iommu_disable,
+        .reenable               = amd_iommu_reenable,
+        .enable_faulting        = amd_iommu_enable_faulting,
+        .setup_ioapic_entry     = setup_ioapic_entry,
+        .set_affinity           = set_affinity,
+        .free_irq               = free_irq,
+        .compose_msi_msg        = compose_msi_msg,
+        .msi_alloc_irq          = msi_alloc_irq,
+        .msi_setup_irq          = msi_setup_irq,
+        .setup_hpet_msi         = setup_hpet_msi,
+};
 #endif
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 68b3305a126..d536d24b6f3 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -34,6 +34,7 @@
 #include <asm/x86_init.h>
 #include <asm/iommu_table.h>
 #include <asm/io_apic.h>
+#include <asm/irq_remapping.h>
 
 #include "amd_iommu_proto.h"
 #include "amd_iommu_types.h"
@@ -1897,7 +1898,48 @@ static int __init iommu_go_to_state(enum iommu_init_state state)
         return ret;
 }
 
+#ifdef CONFIG_IRQ_REMAP
+int __init amd_iommu_prepare(void)
+{
+        return iommu_go_to_state(IOMMU_ACPI_FINISHED);
+}
+
+int __init amd_iommu_supported(void)
+{
+        return amd_iommu_irq_remap ? 1 : 0;
+}
+
+int __init amd_iommu_enable(void)
+{
+        int ret;
+
+        ret = iommu_go_to_state(IOMMU_ENABLED);
+        if (ret)
+                return ret;
 
+        irq_remapping_enabled = 1;
+
+        return 0;
+}
+
+void amd_iommu_disable(void)
+{
+        amd_iommu_suspend();
+}
+
+int amd_iommu_reenable(int mode)
+{
+        amd_iommu_resume();
+
+        return 0;
+}
+
+int __init amd_iommu_enable_faulting(void)
+{
+        /* We enable MSI later when PCI is initialized */
+        return 0;
+}
+#endif
 
 /*
  * This is the core init function for AMD IOMMU hardware in the system.
diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h
index 1a7f41c6cc6..c294961bdd3 100644
--- a/drivers/iommu/amd_iommu_proto.h
+++ b/drivers/iommu/amd_iommu_proto.h
@@ -32,6 +32,14 @@ extern void amd_iommu_uninit_devices(void);
 extern void amd_iommu_init_notifier(void);
 extern void amd_iommu_init_api(void);
 
+/* Needed for interrupt remapping */
+extern int amd_iommu_supported(void);
+extern int amd_iommu_prepare(void);
+extern int amd_iommu_enable(void);
+extern void amd_iommu_disable(void);
+extern int amd_iommu_reenable(int);
+extern int amd_iommu_enable_faulting(void);
+
 /* IOMMUv2 specific functions */
 struct iommu_domain;
 
diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h
index 624d360d9be..95363acb583 100644
--- a/drivers/iommu/irq_remapping.h
+++ b/drivers/iommu/irq_remapping.h
@@ -82,6 +82,7 @@ struct irq_remap_ops {
 };
 
 extern struct irq_remap_ops intel_irq_remap_ops;
+extern struct irq_remap_ops amd_iommu_irq_ops;
 
 #else  /* CONFIG_IRQ_REMAP */