[RFC PATCH 15/28] conf: Add helper to get active functions of a slot of domain

[Shivaprasad G Bhat <sbhat@xxxxxxxxxxxxxxxxxx>]

In some cases it may be better to have a bitmap representing state of
individual functions rather than iterating the definition. The new helper
creates a bitmap representing the state from the domain definition.

Signed-off-by: Shivaprasad G Bhat <sbhat@xxxxxxxxxxxxxxxxxx>
---
 src/conf/domain_conf.c   |   25 +++++++++++++++++++++++++
 src/conf/domain_conf.h   |    3 +++
 src/libvirt_private.syms |    1 +
 3 files changed, 29 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 86fc275116..3deed8eb4d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -16146,6 +16146,31 @@ virDomainHostdevFind(virDomainDefPtr def,
     return *found ? i : -1;
 }
 
+#define PCI_MAX_SLOT_FUNCTIONS 8
+/**
+ * virDomainDefHostdevGetPCIOnlineFunctionMap:
+ * @def: domain definition
+ * @aggrSlotIdx: slot aggregation index
+ * Returns a bitmap representing state of individual functions of a slot.
+ */
+virBitmapPtr
+virDomainDefHostdevGetPCIOnlineFunctionMap(virDomainDefPtr def,
+                                           int aggrSlotIdx)
+{
+    size_t i;
+    virBitmapPtr ret = NULL;
+
+    if (!(ret = virBitmapNew(PCI_MAX_SLOT_FUNCTIONS)))
+        return NULL;
+
+    for (i = 0; i < def->nhostdevs; i++) {
+        if (def->hostdevs[i]->info->aggregateSlotIdx == aggrSlotIdx)
+            ignore_value(virBitmapSetBit(ret, def->hostdevs[i]->source.subsys.u.pci.addr.function));
+    }
+
+    return ret;
+}
+
 static bool
 virDomainDiskControllerMatch(int controller_type, int disk_bus)
 {
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 61379e50fe..a3d686a5ca 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3067,6 +3067,9 @@ virDomainHostdevDefPtr
 virDomainHostdevRemove(virDomainDefPtr def, size_t i);
 int virDomainHostdevFind(virDomainDefPtr def, virDomainHostdevDefPtr match,
                          virDomainHostdevDefPtr *found);
+virBitmapPtr virDomainDefHostdevGetPCIOnlineFunctionMap(virDomainDefPtr def,
+                                                        int aggrSlotIdx);
+
 
 virDomainGraphicsListenDefPtr
 virDomainGraphicsGetListen(virDomainGraphicsDefPtr def, size_t i);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index b092c240d8..b0e8f2ca61 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -278,6 +278,7 @@ virDomainDefHasMemballoon;
 virDomainDefHasMemoryHotplug;
 virDomainDefHasUSB;
 virDomainDefHasVcpusOffline;
+virDomainDefHostdevGetPCIOnlineFunctionMap;
 virDomainDefLifecycleActionAllowed;
 virDomainDefMaybeAddController;
 virDomainDefMaybeAddInput;

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