[RFC PATCH 3/23] VIOMMU: Add irq request callback to deal with irq remapping

[Lan Tianyu <tianyu.lan@intel.com>]

This patch is to add irq request callback for platform implementation
to deal with irq remapping request.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
 xen/common/viommu.c          | 11 +++++++++++
 xen/include/asm-arm/viommu.h |  4 ++++
 xen/include/asm-x86/viommu.h | 15 +++++++++++++++
 xen/include/xen/viommu.h     |  8 ++++++++
 4 files changed, 38 insertions(+)

diff --git a/xen/common/viommu.c b/xen/common/viommu.c
index 4c1c788..62c66db 100644
--- a/xen/common/viommu.c
+++ b/xen/common/viommu.c
@@ -87,6 +87,17 @@ u64 viommu_query_caps(struct domain *d)
     return info->ops->query_caps(d);
 }
 
+int viommu_handle_irq_request(struct domain *d,
+        struct irq_remapping_request *request)
+{
+    struct viommu_info *info = &d->viommu;
+
+    if ( !info || !info->ops || !info->ops->handle_irq_request)
+        return -EINVAL;
+
+    return info->ops->handle_irq_request(d, request);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/viommu.h b/xen/include/asm-arm/viommu.h
index ef6a60b..6a81ecb 100644
--- a/xen/include/asm-arm/viommu.h
+++ b/xen/include/asm-arm/viommu.h
@@ -22,6 +22,10 @@
 
 #include <xen/viommu.h>
 
+struct irq_remapping_request
+{
+};
+
 static inline const struct viommu_ops *viommu_get_ops(void)
 {
     return NULL;
diff --git a/xen/include/asm-x86/viommu.h b/xen/include/asm-x86/viommu.h
index efb435f..b6e01a5 100644
--- a/xen/include/asm-x86/viommu.h
+++ b/xen/include/asm-x86/viommu.h
@@ -23,6 +23,21 @@
 #include <xen/viommu.h>
 #include <asm/types.h>
 
+struct irq_remapping_request
+{
+    u8 type;
+    u16 source_id;
+    union {
+        /* MSI */
+        struct {
+            u64 addr;
+            u32 data;
+        } msi;
+        /* Redirection Entry in IOAPIC */
+        u64 rte;
+    } msg;
+};
+
 static inline const struct viommu_ops *viommu_get_ops(void)
 {
     return NULL;
diff --git a/xen/include/xen/viommu.h b/xen/include/xen/viommu.h
index a0abbdf..246b29d 100644
--- a/xen/include/xen/viommu.h
+++ b/xen/include/xen/viommu.h
@@ -24,6 +24,10 @@
 
 #define NR_VIOMMU_PER_DOMAIN 1
 
+/* IRQ request type */
+#define VIOMMU_REQUEST_IRQ_MSI          0
+#define VIOMMU_REQUEST_IRQ_APIC         1
+
 struct viommu {
     u64 base_address;
     u64 length;
@@ -36,6 +40,8 @@ struct viommu_ops {
     u64 (*query_caps)(struct domain *d);
     int (*create)(struct domain *d, struct viommu *viommu);
     int (*destroy)(struct viommu *viommu);
+    int (*handle_irq_request)(struct domain *d,
+                              struct irq_remapping_request *request);
 };
 
 struct viommu_info {
@@ -48,6 +54,8 @@ int viommu_init_domain(struct domain *d);
 int viommu_create(struct domain *d, u64 base_address, u64 length, u64 caps);
 int viommu_destroy(struct domain *d, u32 viommu_id);
 u64 viommu_query_caps(struct domain *d);
+int viommu_handle_irq_request(struct domain *d,
+                              struct irq_remapping_request *request);
 
 #endif /* __XEN_VIOMMU_H__ */
 
-- 
1.8.3.1


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