pci: introduce helper function to handle msi-x and msi.

this patch implements helper functions to handle msi-x and msi
uniformly.
They will be used later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/hw/pci.c b/hw/pci.c
index e3462a9384..300079f4af 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -25,6 +25,8 @@
 #include "pci.h"
 #include "pci_bridge.h"
 #include "pci_internals.h"
+#include "msix.h"
+#include "msi.h"
 #include "monitor.h"
 #include "net.h"
 #include "sysemu.h"
@@ -1034,6 +1036,23 @@ static void pci_set_irq(void *opaque, int irq_num, int level)
     pci_change_irq_level(pci_dev, irq_num, change);
 }
 
+bool pci_msi_enabled(PCIDevice *dev)
+{
+    return msix_enabled(dev) || msi_enabled(dev);
+}
+
+void pci_msi_notify(PCIDevice *dev, unsigned int vector)
+{
+    if (msix_enabled(dev)) {
+        msix_notify(dev, vector);
+    } else if (msi_enabled(dev)) {
+        msi_notify(dev, vector);
+    } else {
+        /* MSI/MSI-X must be enabled */
+        abort();
+    }
+}
+
 /***********************************************************/
 /* monitor info on PCI */
 
diff --git a/hw/pci.h b/hw/pci.h
index 752e652eca..3072a5f854 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -239,6 +239,9 @@ void do_pci_info_print(Monitor *mon, const QObject *data);
 void do_pci_info(Monitor *mon, QObject **ret_data);
 void pci_bridge_update_mappings(PCIBus *b);
 
+bool pci_msi_enabled(PCIDevice *dev);
+void pci_msi_notify(PCIDevice *dev, unsigned int vector);
+
 static inline void
 pci_set_byte(uint8_t *config, uint8_t val)
 {