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authorPaolo Bonzini <pbonzini@redhat.com>2013-12-06 17:54:27 +0100
committerMichael S. Tsirkin <mst@redhat.com>2013-12-23 13:12:35 +0200
commitdcc209314afdaeec42f1e2a7bbf37eec3ace23de (patch)
treee19b43b2d1acdc2bdb0b26dfe390e117ce19c963 /hw/pci
parent0293214b8c5bf56a095d0a39c5821c9da66dd566 (diff)
qdev: switch reset to post-order
Post-order is the only sensible direction for the reset signals. For example, suppose pre-order is used and the parent has some data structures that cache children state (for example a list of active requests). When the reset method is invoked on the parent, these caches could be in any state. If post-order is used, on the other hand, these will be in a known state when the reset method is invoked on the parent. This change means that it is no longer possible to block the visit of the devices, so the callback is changed to return void. This is not a problem, because PCI was returning 1 exactly in order to achieve the same ordering that this patch implements. PCI can then rely on the qdev core having sent a "reset signal" (whatever that means) to the device, and only do the PCI-specific initialization with pci_do_device_reset. MST: fixed up virtio-ccw Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/pci')
-rw-r--r--hw/pci/pci.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 131e599621..aa2a395499 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -46,7 +46,7 @@
static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent);
static char *pcibus_get_dev_path(DeviceState *dev);
static char *pcibus_get_fw_dev_path(DeviceState *dev);
-static int pcibus_reset(BusState *qbus);
+static void pcibus_reset(BusState *qbus);
static void pci_bus_finalize(Object *obj);
static Property pci_props[] = {
@@ -167,16 +167,10 @@ void pci_device_deassert_intx(PCIDevice *dev)
}
}
-/*
- * This function is called on #RST and FLR.
- * FLR if PCI_EXP_DEVCTL_BCR_FLR is set
- */
-void pci_device_reset(PCIDevice *dev)
+static void pci_do_device_reset(PCIDevice *dev)
{
int r;
- qdev_reset_all(&dev->qdev);
-
dev->irq_state = 0;
pci_update_irq_status(dev);
pci_device_deassert_intx(dev);
@@ -209,27 +203,34 @@ void pci_device_reset(PCIDevice *dev)
}
/*
+ * This function is called on #RST and FLR.
+ * FLR if PCI_EXP_DEVCTL_BCR_FLR is set
+ */
+void pci_device_reset(PCIDevice *dev)
+{
+ qdev_reset_all(&dev->qdev);
+ pci_do_device_reset(dev);
+}
+
+/*
* Trigger pci bus reset under a given bus.
- * To be called on RST# assert.
+ * Called via qbus_reset_all on RST# assert, after the devices
+ * have been reset qdev_reset_all-ed already.
*/
-static int pcibus_reset(BusState *qbus)
+static void pcibus_reset(BusState *qbus)
{
PCIBus *bus = DO_UPCAST(PCIBus, qbus, qbus);
int i;
for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) {
if (bus->devices[i]) {
- pci_device_reset(bus->devices[i]);
+ pci_do_device_reset(bus->devices[i]);
}
}
for (i = 0; i < bus->nirq; i++) {
assert(bus->irq_count[i] == 0);
}
-
- /* topology traverse is done by pci_bus_reset().
- Tell qbus/qdev walker not to traverse the tree */
- return 1;
}
static void pci_host_bus_register(PCIBus *bus, DeviceState *parent)