[RFC PATCH 5/5] hw/acpi/ich9: Enable ACPI PCI hot-plug

[Julia Suvorova <jusual@redhat.com>]

Add acpi_pcihp to ich9_pm and use ACPI PCI hot-plug by default.

Signed-off-by: Julia Suvorova <jusual@redhat.com>
---
 include/hw/acpi/ich9.h |  3 +++
 hw/acpi/ich9.c         | 45 ++++++++++++++++++++++++++++++++++++++++++
 hw/acpi/pcihp.c        |  3 ++-
 hw/i386/pc.c           |  4 +++-
 4 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index 28a53181cb..d345da6b74 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -24,6 +24,7 @@
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/cpu_hotplug.h"
 #include "hw/acpi/cpu.h"
+#include "hw/acpi/pcihp.h"
 #include "hw/acpi/memory_hotplug.h"
 #include "hw/acpi/acpi_dev_interface.h"
 #include "hw/acpi/tco.h"
@@ -53,6 +54,8 @@ typedef struct ICH9LPCPMRegs {
     AcpiCpuHotplug gpe_cpu;
     CPUHotplugState cpuhp_state;
 
+    bool use_acpi_pci_hotplug;
+    AcpiPciHpState acpi_pci_hotplug;
     MemHotplugState acpi_memory_hotplug;
 
     uint8_t disable_s3;
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 0fdd736da4..e0291373f2 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -265,6 +265,7 @@ static void pm_reset(void *opaque)
     }
     pm->smi_en_wmask = ~0;
 
+    acpi_pcihp_reset(&pm->acpi_pci_hotplug);
     acpi_update_sci(&pm->acpi_regs, pm->irq);
 }
 
@@ -303,6 +304,17 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
     pm->enable_tco = true;
     acpi_pm_tco_init(&pm->tco_regs, &pm->io);
 
+    if (pm->use_acpi_pci_hotplug) {
+        acpi_pcihp_init(OBJECT(lpc_pci),
+                        &pm->acpi_pci_hotplug,
+                        pci_get_bus(lpc_pci),
+                        pci_address_space_io(lpc_pci),
+                        true);
+        qbus_set_hotplug_handler(BUS(pci_get_bus(lpc_pci)),
+                                 OBJECT(lpc_pci),
+                                 &error_abort);
+    }
+
     pm->irq = sci_irq;
     qemu_register_reset(pm_reset, pm);
     pm->powerdown_notifier.notify = pm_powerdown_req;
@@ -374,6 +386,20 @@ static void ich9_pm_set_enable_tco(Object *obj, bool value, Error **errp)
     s->pm.enable_tco = value;
 }
 
+static bool ich9_pm_get_acpi_pci_hotplug(Object *obj, Error **errp)
+{
+    ICH9LPCState *s = ICH9_LPC_DEVICE(obj);
+
+    return s->pm.use_acpi_pci_hotplug;
+}
+
+static void ich9_pm_set_acpi_pci_hotplug(Object *obj, bool value,
+                                               Error **errp)
+{
+    ICH9LPCState *s = ICH9_LPC_DEVICE(obj);
+
+    s->pm.use_acpi_pci_hotplug = value;
+}
 void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
 {
     static const uint32_t gpe0_len = ICH9_PMIO_GPE0_LEN;
@@ -382,6 +408,7 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
     pm->disable_s3 = 0;
     pm->disable_s4 = 0;
     pm->s4_val = 2;
+    pm->use_acpi_pci_hotplug = true;
 
     object_property_add_uint32_ptr(obj, ACPI_PM_PROP_PM_IO_BASE,
                                    &pm->pm_io_base, OBJ_PROP_FLAG_READ);
@@ -405,6 +432,9 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm)
     object_property_add_bool(obj, ACPI_PM_PROP_TCO_ENABLED,
                              ich9_pm_get_enable_tco,
                              ich9_pm_set_enable_tco);
+    object_property_add_bool(obj, "acpi-pci-hotplug-with-bridge-support",
+                             ich9_pm_get_acpi_pci_hotplug,
+                             ich9_pm_set_acpi_pci_hotplug);
 }
 
 void ich9_pm_device_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
@@ -412,6 +442,11 @@ void ich9_pm_device_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
 {
     ICH9LPCState *lpc = ICH9_LPC_DEVICE(hotplug_dev);
 
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        acpi_pcihp_device_pre_plug_cb(hotplug_dev, dev, errp);
+        return;
+    }
+
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) &&
         !lpc->pm.acpi_memory_hotplug.is_enabled)
         error_setg(errp,
@@ -437,6 +472,9 @@ void ich9_pm_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
         } else {
             acpi_cpu_plug_cb(hotplug_dev, &lpc->pm.cpuhp_state, dev, errp);
         }
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        acpi_pcihp_device_plug_cb(hotplug_dev, &lpc->pm.acpi_pci_hotplug,
+                                  dev, errp);
     } else {
         error_setg(errp, "acpi: device plug request for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
@@ -457,6 +495,10 @@ void ich9_pm_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                !lpc->pm.cpu_hotplug_legacy) {
         acpi_cpu_unplug_request_cb(hotplug_dev, &lpc->pm.cpuhp_state,
                                    dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        acpi_pcihp_device_unplug_request_cb(hotplug_dev,
+                                            &lpc->pm.acpi_pci_hotplug,
+                                            dev, errp);
     } else {
         error_setg(errp, "acpi: device unplug request for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
@@ -474,6 +516,9 @@ void ich9_pm_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
                !lpc->pm.cpu_hotplug_legacy) {
         acpi_cpu_unplug_cb(&lpc->pm.cpuhp_state, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        acpi_pcihp_device_unplug_cb(hotplug_dev, &lpc->pm.acpi_pci_hotplug,
+                                    dev, errp);
     } else {
         error_setg(errp, "acpi: device unplug for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 3d4ee3af72..d905d1b8f2 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -110,7 +110,8 @@ static void acpi_set_pci_info(void)
     }
     bsel_is_set = true;
 
-    bus = find_i440fx(); /* TODO: Q35 support */
+    bus = find_host();
+
     if (bus) {
         /* Scan all PCI buses. Set property to enable acpi based hotplug. */
         pci_for_each_bus_depth_first(bus, acpi_set_bsel, NULL, &bsel_alloc);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 143ac1c354..21c6eb779e 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -96,7 +96,9 @@
 #include "fw_cfg.h"
 #include "trace.h"
 
-GlobalProperty pc_compat_5_0[] = {};
+GlobalProperty pc_compat_5_0[] = {
+    { "ICH9-LPC", "acpi-pci-hotplug-with-bridge-support", "off" },
+};
 const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);
 
 GlobalProperty pc_compat_4_2[] = {
-- 
2.25.4