[Qemu-devel] [PATCH RFC v6 09/11] qdev: add bus reset_notifiers callbacks for host bus reset

[Chen Fan]

when recovery AER, we always need to reset the host bus to recovery
the devices under the bus, so add pci bus callbacks to reset host bus
when vfio support AER.

Signed-off-by: Chen Fan <address@hidden>
---
 hw/pci/pci.c             | 6 ++++++
 hw/pci/pci_bridge.c      | 3 +++
 include/hw/pci/pci.h     | 2 ++
 include/hw/pci/pci_bus.h | 2 ++
 4 files changed, 13 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index b3d5100..427d4d6 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -74,11 +74,17 @@ static const VMStateDescription vmstate_pcibus = {
     }
 };
 
+void pci_bus_add_reset_notifier(PCIBus *bus, Notifier *notify)
+{
+    notifier_list_add(&bus->reset_notifiers, notify);
+}
+
 static void pci_bus_realize(BusState *qbus, Error **errp)
 {
     PCIBus *bus = PCI_BUS(qbus);
 
     vmstate_register(NULL, -1, &vmstate_pcibus, bus);
+    notifier_list_init(&bus->reset_notifiers);
 }
 
 static void pci_bus_unrealize(BusState *qbus, Error **errp)
diff --git a/hw/pci/pci_bridge.c b/hw/pci/pci_bridge.c
index 40c97b1..24fee8b 100644
--- a/hw/pci/pci_bridge.c
+++ b/hw/pci/pci_bridge.c
@@ -267,6 +267,9 @@ void pci_bridge_write_config(PCIDevice *d,
 
     newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);
     if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {
+        /* do host secondary bus reset for passthrough devices */
+        notifier_list_notify(&s->sec_bus.reset_notifiers, NULL);
+
         /* Trigger hot reset on 0->1 transition. */
         qbus_reset_all(&s->sec_bus.qbus);
     }
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index d4ffead..79ae725 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -7,6 +7,7 @@
 #include "exec/memory.h"
 #include "sysemu/dma.h"
 #include "qapi/error.h"
+#include "qemu/notify.h"
 
 /* PCI includes legacy ISA access.  */
 #include "hw/isa/isa.h"
@@ -370,6 +371,7 @@ void pci_bus_fire_intx_routing_notifier(PCIBus *bus);
 void pci_device_set_intx_routing_notifier(PCIDevice *dev,
                                           PCIINTxRoutingNotifier notifier);
 void pci_device_reset(PCIDevice *dev);
+void pci_bus_add_reset_notifier(PCIBus *bus, Notifier *notify);
 
 PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
                                const char *default_model,
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index fabaeee..3b551d7 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -29,6 +29,8 @@ struct PCIBus {
        Keep a count of the number of devices with raised IRQs.  */
     int nirq;
     int *irq_count;
+
+    NotifierList reset_notifiers;
 };
 
 typedef struct PCIBridgeWindows PCIBridgeWindows;
-- 
1.9.3