[Qemu-devel] [PATCH v2 09/10] pci/shpc: perform unplug via the hotplug handler

[David Hildenbrand <david@redhat.com>]

Introduce and use the "unplug" callback.

This is a preparation for multi-stage hotplug handlers, whereby the bus
hotplug handler is overwritten by the machine hotplug handler. This handler
will then pass control to the bus hotplug handler. So to get this running
cleanly, we also have to make sure to go via the hotplug handler chain when
actually unplugging a device after an unplug request. Lookup the hotplug
handler and call "unplug".

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/pci-bridge/pci_bridge_dev.c  | 14 ++++++++++++++
 hw/pci-bridge/pcie_pci_bridge.c | 14 ++++++++++++++
 hw/pci/shpc.c                   | 11 ++++++++++-
 include/hw/pci/shpc.h           |  2 ++
 4 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/hw/pci-bridge/pci_bridge_dev.c b/hw/pci-bridge/pci_bridge_dev.c
index e1df9a52ac..91415f114c 100644
--- a/hw/pci-bridge/pci_bridge_dev.c
+++ b/hw/pci-bridge/pci_bridge_dev.c
@@ -219,6 +219,19 @@ static void pci_bridge_dev_plug_cb(HotplugHandler *hotplug_dev,
     shpc_device_plug_cb(hotplug_dev, dev, errp);
 }
 
+static void pci_bridge_dev_unplug_cb(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
+
+    if (!shpc_present(pci_hotplug_dev)) {
+        error_setg(errp, "standard hotplug controller has been disabled for "
+                   "this %s", TYPE_PCI_BRIDGE_DEV);
+        return;
+    }
+    shpc_device_unplug_cb(hotplug_dev, dev, errp);
+}
+
 static void pci_bridge_dev_unplug_request_cb(HotplugHandler *hotplug_dev,
                                              DeviceState *dev, Error **errp)
 {
@@ -251,6 +264,7 @@ static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &pci_bridge_dev_vmstate;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     hc->plug = pci_bridge_dev_plug_cb;
+    hc->unplug = pci_bridge_dev_unplug_cb;
     hc->unplug_request = pci_bridge_dev_unplug_request_cb;
 }
 
diff --git a/hw/pci-bridge/pcie_pci_bridge.c b/hw/pci-bridge/pcie_pci_bridge.c
index c634353b06..7c667bc97c 100644
--- a/hw/pci-bridge/pcie_pci_bridge.c
+++ b/hw/pci-bridge/pcie_pci_bridge.c
@@ -150,6 +150,19 @@ static void pcie_pci_bridge_plug_cb(HotplugHandler *hotplug_dev,
     shpc_device_plug_cb(hotplug_dev, dev, errp);
 }
 
+static void pcie_pci_bridge_unplug_cb(HotplugHandler *hotplug_dev,
+                                      DeviceState *dev, Error **errp)
+{
+    PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
+
+    if (!shpc_present(pci_hotplug_dev)) {
+        error_setg(errp, "standard hotplug controller has been disabled for "
+                   "this %s", TYPE_PCIE_PCI_BRIDGE_DEV);
+        return;
+    }
+    shpc_device_unplug_cb(hotplug_dev, dev, errp);
+}
+
 static void pcie_pci_bridge_unplug_request_cb(HotplugHandler *hotplug_dev,
                                               DeviceState *dev, Error **errp)
 {
@@ -180,6 +193,7 @@ static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data)
     dc->reset = &pcie_pci_bridge_reset;
     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
     hc->plug = pcie_pci_bridge_plug_cb;
+    hc->unplug = pcie_pci_bridge_unplug_cb;
     hc->unplug_request = pcie_pci_bridge_unplug_request_cb;
 }
 
diff --git a/hw/pci/shpc.c b/hw/pci/shpc.c
index 098ffaef1d..5de905cb56 100644
--- a/hw/pci/shpc.c
+++ b/hw/pci/shpc.c
@@ -238,6 +238,7 @@ static void shpc_invalid_command(SHPCDevice *shpc)
 
 static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot)
 {
+    HotplugHandler *hotplug_ctrl;
     int devfn;
     int pci_slot = SHPC_IDX_TO_PCI(slot);
     for (devfn = PCI_DEVFN(pci_slot, 0);
@@ -245,7 +246,9 @@ static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot)
          ++devfn) {
         PCIDevice *affected_dev = shpc->sec_bus->devices[devfn];
         if (affected_dev) {
-            object_unparent(OBJECT(affected_dev));
+            hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(affected_dev));
+            hotplug_handler_unplug(hotplug_ctrl, DEVICE(affected_dev),
+                                   &error_abort);
         }
     }
 }
@@ -540,6 +543,12 @@ void shpc_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
     shpc_interrupt_update(pci_hotplug_dev);
 }
 
+void shpc_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
+                           Error **errp)
+{
+    object_unparent(OBJECT(dev));
+}
+
 void shpc_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                                    DeviceState *dev, Error **errp)
 {
diff --git a/include/hw/pci/shpc.h b/include/hw/pci/shpc.h
index 71293aca58..18f6ec1cd5 100644
--- a/include/hw/pci/shpc.h
+++ b/include/hw/pci/shpc.h
@@ -47,6 +47,8 @@ void shpc_cap_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int len);
 
 void shpc_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
                          Error **errp);
+void shpc_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
+                           Error **errp);
 void shpc_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                                    DeviceState *dev, Error **errp);
 
-- 
2.17.2