[RFC PATCH V2 4/26] VIOMMU: Add get irq info callback to convert irq remapping request

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

This patch is to add get_irq_info callback for platform implementation
to convert irq remapping request to irq info (E,G vector, dest, dest_mode
and so on).

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
 xen/common/viommu.c          | 16 ++++++++++++++++
 xen/include/asm-x86/viommu.h |  8 ++++++++
 xen/include/xen/viommu.h     |  9 +++++++++
 3 files changed, 33 insertions(+)

diff --git a/xen/common/viommu.c b/xen/common/viommu.c
index 4e3ecd7..c6c9589 100644
--- a/xen/common/viommu.c
+++ b/xen/common/viommu.c
@@ -209,6 +209,22 @@ int viommu_handle_irq_request(struct domain *d, u32 viommu_id,
     return info->viommu[viommu_id]->ops->handle_irq_request(d, request);
 }
 
+int viommu_get_irq_info(struct domain *d, u32 viommu_id,
+                        struct irq_remapping_request *request,
+                        struct irq_remapping_info *irq_info)
+{
+    struct viommu_info *info = &d->viommu;
+
+    if ( !info || viommu_id > info->nr_viommu
+         || !info->viommu[viommu_id] )
+        return -EINVAL;
+
+    if ( !info->viommu[viommu_id]->ops->get_irq_info )
+        return -EINVAL;
+
+    return info->viommu[viommu_id]->ops->get_irq_info(d, request, irq_info);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-x86/viommu.h b/xen/include/asm-x86/viommu.h
index 51bda72..1e8d4be 100644
--- a/xen/include/asm-x86/viommu.h
+++ b/xen/include/asm-x86/viommu.h
@@ -27,6 +27,14 @@
 #define VIOMMU_REQUEST_IRQ_MSI          0
 #define VIOMMU_REQUEST_IRQ_APIC         1
 
+struct irq_remapping_info
+{
+    u8  vector;
+    u32 dest;
+    u32 dest_mode:1;
+    u32 delivery_mode:3;
+};
+
 struct irq_remapping_request
 {
     union {
diff --git a/xen/include/xen/viommu.h b/xen/include/xen/viommu.h
index 5b99211..e40fca4 100644
--- a/xen/include/xen/viommu.h
+++ b/xen/include/xen/viommu.h
@@ -32,6 +32,8 @@ struct viommu_ops {
     int (*destroy)(struct viommu *viommu);
     int (*handle_irq_request)(struct domain *d,
                               struct irq_remapping_request *request);
+    int (*get_irq_info)(struct domain *d, struct irq_remapping_request *request,
+                        struct irq_remapping_info *info);
 };
 
 struct viommu {
@@ -61,6 +63,9 @@ int viommu_domctl(struct domain *d, struct xen_domctl_viommu_op *op,
 int viommu_setup(void);
 int viommu_handle_irq_request(struct domain *d, u32 viommu_id,
                               struct irq_remapping_request *request);
+int viommu_get_irq_info(struct domain *d, u32 viommu_id, 
+                        struct irq_remapping_request *request,
+                        struct irq_remapping_info *irq_info);
 #else
 static inline int viommu_init_domain(struct domain *d) { return 0 };
 static inline int viommu_create(struct domain *d, u64 type, u64 base_address,
@@ -79,6 +84,10 @@ static inline int viommu_domctl(struct domain *d,
 static inline int viommu_handle_irq_request(struct domain *d, u32 viommu_id,
                               struct irq_remapping_request *request)
 { return 0 };
+static inline int viommu_get_irq_info(struct domain *d, u32 viommu_id,
+                                      struct irq_remapping_request *request,
+                                      struct irq_remapping_info *irq_info)
+{ return 0 };
 #endif
 
 #endif /* __XEN_VIOMMU_H__ */
-- 
1.8.3.1


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