[RFC PATCH 3/5] virpci: introduce virPCIIOMMUGroupIterate()

[Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>]

This serves a similar purpose to virPCIDeviceAddressIOMMUGroupIterate,
but uses the iommu group number to find matches instead of a device
within the group. We refactor the code to use this new function and
also export it for use in subsequent patches.

Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 src/util/virpci.c | 42 ++++++++++++++++++++++++++++++------------
 src/util/virpci.h |  3 +++
 2 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/src/util/virpci.c b/src/util/virpci.c
index 2c1b758..b842f44 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -49,6 +49,7 @@
 VIR_LOG_INIT("util.pci");
 
 #define PCI_SYSFS "/sys/bus/pci/"
+#define IOMMU_GROUP_SYSFS "/sys/kernel/iommu_groups/"
 #define PCI_ID_LEN 10   /* "XXXX XXXX" */
 #define PCI_ADDR_LEN 13 /* "XXXX:XX:XX.X" */
 
@@ -2178,16 +2179,13 @@ int virPCIDeviceFileIterate(virPCIDevicePtr dev,
     return ret;
 }
 
-
-/* virPCIDeviceAddressIOMMUGroupIterate:
- *   Call @actor for all devices in the same iommu_group as orig
- *   (including orig itself) Even if there is no iommu_group for the
- *   device, call @actor once for orig.
+/* virPCIIOMMUGroupIterate:
+ *   Call @actor for all devices in a particular iommu_group.
  */
 int
-virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
-                                     virPCIDeviceAddressActor actor,
-                                     void *opaque)
+virPCIIOMMUGroupIterate(int iommu_group,
+                        virPCIDeviceAddressActor actor,
+                        void *opaque)
 {
     char *groupPath = NULL;
     DIR *groupDir = NULL;
@@ -2196,13 +2194,11 @@ virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
     int direrr;
 
     if (virAsprintf(&groupPath,
-                    PCI_SYSFS "devices/%04x:%02x:%02x.%x/iommu_group/devices",
-                    orig->domain, orig->bus, orig->slot, orig->function) < 0)
+                    IOMMU_GROUP_SYSFS "%d/devices",
+                    iommu_group) < 0)
         goto cleanup;
 
     if (virDirOpenQuiet(&groupDir, groupPath) < 0) {
-        /* just process the original device, nothing more */
-        ret = (actor)(orig, opaque);
         goto cleanup;
     }
 
@@ -2230,6 +2226,28 @@ virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
     return ret;
 }
 
+/* virPCIDeviceAddressIOMMUGroupIterate:
+ *   Call @actor for all devices in the same iommu_group as orig
+ *   (including orig itself) Even if there is no iommu_group for the
+ *   device, call @actor once for orig.
+ */
+int
+virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
+                                     virPCIDeviceAddressActor actor,
+                                     void *opaque)
+{
+    int ret = -1;
+
+    ret = virPCIIOMMUGroupIterate(virPCIDeviceAddressGetIOMMUGroupNum(orig),
+                                  actor, opaque);
+    if (ret < 0) {
+        /* just process the original device, nothing more */
+        ret = (actor)(orig, opaque);
+    }
+
+    return ret;
+}
+
 
 static int
 virPCIDeviceGetIOMMUGroupAddOne(virPCIDeviceAddressPtr newDevAddr, void *opaque)
diff --git a/src/util/virpci.h b/src/util/virpci.h
index 570684e..5ec1306 100644
--- a/src/util/virpci.h
+++ b/src/util/virpci.h
@@ -176,6 +176,9 @@ typedef int (*virPCIDeviceAddressActor)(virPCIDeviceAddressPtr addr,
 int virPCIDeviceAddressIOMMUGroupIterate(virPCIDeviceAddressPtr orig,
                                          virPCIDeviceAddressActor actor,
                                          void *opaque);
+int virPCIIOMMUGroupIterate(int iommu_group,
+                            virPCIDeviceAddressActor actor,
+                            void *opaque);
 virPCIDeviceListPtr virPCIDeviceGetIOMMUGroupList(virPCIDevicePtr dev);
 int virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr devAddr,
                                               virPCIDeviceAddressPtr **iommuGroupDevices,
-- 
2.7.4

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