pcihp: make bridge describe itself using AcpiDevAmlIfClass:build_dev_aml

simplify build_append_pci_bus_devices() a bit by handling bridge
specific logic in bridge dedicated AcpiDevAmlIfClass::build_dev_aml
callback.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230112140312.3096331-30-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

4 files changed, 54 insertions, 1 deletions

diff --git a/hw/acpi/Kconfig b/hw/acpi/Kconfig
index 1f7803f..e07d320 100644
--- a/hw/acpi/Kconfig
+++ b/hw/acpi/Kconfig
@@ -39,6 +39,10 @@ config ACPI_PCIHP
     bool
     depends on ACPI
 
+config ACPI_PCI_BRIDGE
+    bool
+    depends on ACPI && PCI && ACPI_PCIHP
+
 config ACPI_HMAT
     bool
     depends on ACPI
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index 30054a8..50b7312 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -19,6 +19,7 @@ acpi_ss.add(when: 'CONFIG_ACPI_HW_REDUCED', if_true: files('generic_event_device
 acpi_ss.add(when: 'CONFIG_ACPI_HMAT', if_true: files('hmat.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_APEI', if_true: files('ghes.c'), if_false: files('ghes-stub.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PIIX4', if_true: files('piix4.c'))
+acpi_ss.add(when: 'CONFIG_ACPI_PCI_BRIDGE', if_true: files('pci-bridge.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_true: files('pcihp.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PCIHP', if_false: files('acpi-pci-hotplug-stub.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_VIOT', if_true: files('viot.c'))
@@ -30,9 +31,10 @@ if have_tpm
   acpi_ss.add(files('tpm.c'))
 endif
 softmmu_ss.add(when: 'CONFIG_ACPI', if_false: files('acpi-stub.c', 'aml-build-stub.c', 'ghes-stub.c', 'acpi_interface.c'))
+softmmu_ss.add(when: 'CONFIG_ACPI_PCI_BRIDGE', if_false: files('pci-bridge-stub.c'))
 softmmu_ss.add_all(when: 'CONFIG_ACPI', if_true: acpi_ss)
 softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-stub.c', 'aml-build-stub.c',
                                                   'acpi-x86-stub.c', 'ipmi-stub.c', 'ghes-stub.c',
                                                   'acpi-mem-hotplug-stub.c', 'acpi-cpu-hotplug-stub.c',
                                                   'acpi-pci-hotplug-stub.c', 'acpi-nvdimm-stub.c',
-                                                  'cxl-stub.c'))
+                                                  'cxl-stub.c', 'pci-bridge-stub.c'))
diff --git a/hw/acpi/pci-bridge-stub.c b/hw/acpi/pci-bridge-stub.c
new file mode 100644
index 0000000..9d78638
--- /dev/null
+++ b/hw/acpi/pci-bridge-stub.c
@@ -0,0 +1,20 @@
+/*
+ * QEMU ACPI PCI bridge stub
+ *
+ * Copyright (c) 2023 Red Hat, Inc.
+ *
+ * Author:
+ *   Igor Mammedov <imammedo@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/acpi/pci.h"
+
+void build_pci_bridge_aml(AcpiDevAmlIf *adev, Aml *scope)
+{
+}
diff --git a/hw/acpi/pci-bridge.c b/hw/acpi/pci-bridge.c
new file mode 100644
index 0000000..5f3ee51
--- /dev/null
+++ b/hw/acpi/pci-bridge.c
@@ -0,0 +1,27 @@
+/*
+ * QEMU ACPI PCI bridge
+ *
+ * Copyright (c) 2023 Red Hat, Inc.
+ *
+ * Author:
+ *   Igor Mammedov <imammedo@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/acpi/pci.h"
+#include "hw/pci/pci_bridge.h"
+#include "hw/acpi/pcihp.h"
+
+void build_pci_bridge_aml(AcpiDevAmlIf *adev, Aml *scope)
+{
+    PCIBridge *br = PCI_BRIDGE(adev);
+
+    if (object_property_find(OBJECT(&br->sec_bus), ACPI_PCIHP_PROP_BSEL)) {
+        build_append_pci_bus_devices(scope, pci_bridge_get_sec_bus(br));
+    }
+}