[Qemu-arm] [RFC v3 23/27] memory: Introduce IOMMU Memory Region inject_faults API

[Eric Auger]

This new API allows to inject @count iommu_faults into
the IOMMU memory region.

Signed-off-by: Eric Auger <address@hidden>
---
 include/exec/memory.h | 26 ++++++++++++++++++++++++++
 memory.c              | 12 ++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index aedebc8471..6262de1684 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -400,6 +400,20 @@ typedef struct IOMMUMemoryRegionClass {
      * @iommu: the IOMMUMemoryRegion
      */
     int (*num_indexes)(IOMMUMemoryRegion *iommu);
+
+#ifdef CONFIG_LINUX
+    /* Inject @count faults into the IOMMU memory region
+     *
+     * Optional method: if this method is not provided, then
+     * memory_region_injection_faults() will return -ENOENT
+     *
+     * @iommu: the IOMMU memory region to inject the faults in
+     * @count: number of faults to inject
+     * @buf: fault buffer
+     */
+    int (*inject_faults)(IOMMUMemoryRegion *iommu, int count,
+                         struct iommu_fault *buf);
+#endif
 } IOMMUMemoryRegionClass;
 
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@@ -1216,6 +1230,18 @@ int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion 
*iommu_mr,
  */
 int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
 
+#ifdef CONFIG_LINUX
+/**
+ * memory_region_inject_faults : inject @count faults stored in @buf
+ *
+ * @iommu_mr: the IOMMU memory region
+ * @count: number of faults to be injected
+ * @buf: buffer containing the faults
+ */
+int memory_region_inject_faults(IOMMUMemoryRegion *iommu_mr, int count,
+                                struct iommu_fault *buf);
+#endif
+
 /**
  * memory_region_name: get a memory region's name
  *
diff --git a/memory.c b/memory.c
index 8cd3c65872..2eac24cb80 100644
--- a/memory.c
+++ b/memory.c
@@ -2037,6 +2037,18 @@ int memory_region_iommu_num_indexes(IOMMUMemoryRegion 
*iommu_mr)
     return imrc->num_indexes(iommu_mr);
 }
 
+#ifdef CONFIG_LINUX
+int memory_region_inject_faults(IOMMUMemoryRegion *iommu_mr, int count,
+                                struct iommu_fault *buf)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+    if (!imrc->inject_faults) {
+        return -ENOENT;
+    }
+    return imrc->inject_faults(iommu_mr, count, buf);
+}
+#endif
+
 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
 {
     uint8_t mask = 1 << client;
-- 
2.20.1