acpi: add interface to build device specific AML

There is already ISADeviceClass::build_aml() callback which
builds device specific AML blob for some ISA devices.
To extend the same idea to other devices, add TYPE_ACPI_DEV_AML_IF
Interface that will provide a more generic callback which
will be used not only for ISA but other devices. It will
allow get rid of some data-mining and ad-hoc AML building,
by asking device(s) to generate its own AML blob like it's
done for ISA devices.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20220608135340.3304695-2-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 49 insertions, 1 deletions

diff --git a/hw/acpi/acpi_interface.c b/hw/acpi/acpi_interface.c
index 6583917..c668d36 100644
--- a/hw/acpi/acpi_interface.c
+++ b/hw/acpi/acpi_interface.c
@@ -1,5 +1,6 @@
 #include "qemu/osdep.h"
 #include "hw/acpi/acpi_dev_interface.h"
+#include "hw/acpi/acpi_aml_interface.h"
 #include "qemu/module.h"
 
 void acpi_send_event(DeviceState *dev, AcpiEventStatusBits event)
@@ -18,8 +19,15 @@ static void register_types(void)
         .parent        = TYPE_INTERFACE,
         .class_size = sizeof(AcpiDeviceIfClass),
     };
+    static const TypeInfo acpi_dev_aml_if_info = {
+        .name          = TYPE_ACPI_DEV_AML_IF,
+        .parent        = TYPE_INTERFACE,
+        .class_size = sizeof(AcpiDevAmlIfClass),
+    };
+
 
     type_register_static(&acpi_dev_if_info);
+    type_register_static(&acpi_dev_aml_if_info);
 }
 
 type_init(register_types)
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index cea2f5f..f8c820c 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -29,7 +29,7 @@ acpi_ss.add(when: 'CONFIG_PC', if_false: files('acpi-x86-stub.c'))
 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'))
+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_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',
diff --git a/include/hw/acpi/acpi_aml_interface.h b/include/hw/acpi/acpi_aml_interface.h
new file mode 100644
index 0000000..ab76f0e
--- /dev/null
+++ b/include/hw/acpi/acpi_aml_interface.h
@@ -0,0 +1,40 @@
+#ifndef ACPI_AML_INTERFACE_H
+#define ACPI_AML_INTERFACE_H
+
+#include "qom/object.h"
+#include "hw/acpi/aml-build.h"
+
+#define TYPE_ACPI_DEV_AML_IF "acpi-dev-aml-interface"
+typedef struct AcpiDevAmlIfClass AcpiDevAmlIfClass;
+DECLARE_CLASS_CHECKERS(AcpiDevAmlIfClass, ACPI_DEV_AML_IF, TYPE_ACPI_DEV_AML_IF)
+#define ACPI_DEV_AML_IF(obj) \
+     INTERFACE_CHECK(AcpiDevAmlIf, (obj), TYPE_ACPI_DEV_AML_IF)
+
+typedef struct AcpiDevAmlIf AcpiDevAmlIf;
+typedef void (*dev_aml_fn)(AcpiDevAmlIf *adev, Aml *scope);
+
+/**
+ * AcpiDevAmlIfClass:
+ *
+ * build_dev_aml: adds device specific AML blob to provided scope
+ *
+ * Interface is designed for providing generic callback that builds device
+ * specific AML blob.
+ */
+struct AcpiDevAmlIfClass {
+    /* <private> */
+    InterfaceClass parent_class;
+
+    /* <public> */
+    dev_aml_fn build_dev_aml;
+};
+
+static inline void call_dev_aml_func(DeviceState *dev, Aml *scope)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_ACPI_DEV_AML_IF)) {
+        AcpiDevAmlIfClass *klass = ACPI_DEV_AML_IF_GET_CLASS(dev);
+        klass->build_dev_aml(ACPI_DEV_AML_IF(dev), scope);
+    }
+}
+
+#endif