acpi: pc: vga: use AcpiDevAmlIf interface to build VGA device descriptors

NB:
We do not expect any functional change in any ACPI tables with this
change. It's only a refactoring.

NB2:
Some targets (or1k) do not support acpi and CONFIG_ACPI is off for them.
However, modules are reused between all architectures so CONFIG_ACPI is
on.  For those architectures, dummy stub function definitions help to
resolve symbols.  This change uses more of these and so it adds a couple
of dummy stub definitions so that symbols for those can be resolved.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20221017102146.2254096-2-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Ani Sinha <ani@anisinha.ca>
CC: Bernhard Beschow <shentey@gmail.com>
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Message-Id: <20221107152744.868434-1-ani@anisinha.ca>

hw/acpi/aml-build-stub.c

@@ -26,6 +26,16 @@ void aml_append(Aml *parent_ctx, Aml *child)
 {
 }
 
+Aml *aml_return(Aml *val)
+{
+    return NULL;
+}
+
+Aml *aml_method(const char *name, int arg_count, AmlSerializeFlag sflag)
+{
+    return NULL;
+}
+
 Aml *aml_resource_template(void)
 {
     return NULL;

hw/display/acpi-vga-stub.c

@@ -0,0 +1,7 @@
+#include "qemu/osdep.h"
+#include "hw/acpi/acpi_aml_interface.h"
+#include "vga_int.h"
+
+void build_vga_aml(AcpiDevAmlIf *adev, Aml *scope)
+{
+}

hw/display/acpi-vga.c

@@ -0,0 +1,26 @@
+#include "qemu/osdep.h"
+#include "hw/acpi/acpi_aml_interface.h"
+#include "hw/pci/pci.h"
+#include "vga_int.h"
+
+void build_vga_aml(AcpiDevAmlIf *adev, Aml *scope)
+{
+    int s3d = 0;
+    Aml *method;
+
+    if (object_dynamic_cast(OBJECT(adev), "qxl-vga")) {
+        s3d = 3;
+    }
+
+    method = aml_method("_S1D", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_return(aml_int(0)));
+    aml_append(scope, method);
+
+    method = aml_method("_S2D", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_return(aml_int(0)));
+    aml_append(scope, method);
+
+    method = aml_method("_S3D", 0, AML_NOTSERIALIZED);
+    aml_append(method, aml_return(aml_int(s3d)));
+    aml_append(scope, method);
+}

hw/display/meson.build

@@ -38,10 +38,21 @@ softmmu_ss.add(when: 'CONFIG_NEXTCUBE', if_true: files('next-fb.c'))
 
 specific_ss.add(when: 'CONFIG_VGA', if_true: files('vga.c'))
 
+if (config_all_devices.has_key('CONFIG_VGA_CIRRUS') or
+    config_all_devices.has_key('CONFIG_VGA_PCI') or
+    config_all_devices.has_key('CONFIG_VMWARE_VGA') or
+    config_all_devices.has_key('CONFIG_ATI_VGA')
+   )
+  softmmu_ss.add(when: 'CONFIG_ACPI', if_true: files('acpi-vga.c'),
+                                      if_false: files('acpi-vga-stub.c'))
+endif
+
 if config_all_devices.has_key('CONFIG_QXL')
   qxl_ss = ss.source_set()
   qxl_ss.add(when: 'CONFIG_QXL', if_true: [files('qxl.c', 'qxl-logger.c', 'qxl-render.c'),
                                            pixman, spice])
+  qxl_ss.add(when: 'CONFIG_ACPI', if_true: files('acpi-vga.c'),
+                                  if_false: files('acpi-vga-stub.c'))
   hw_display_modules += {'qxl': qxl_ss}
 endif
 
@@ -52,6 +63,7 @@ softmmu_ss.add(when: 'CONFIG_ARTIST', if_true: files('artist.c'))
 
 softmmu_ss.add(when: [pixman, 'CONFIG_ATI_VGA'], if_true: files('ati.c', 'ati_2d.c', 'ati_dbg.c'))
 
+
 if config_all_devices.has_key('CONFIG_VIRTIO_GPU')
   virtio_gpu_ss = ss.source_set()
   virtio_gpu_ss.add(when: 'CONFIG_VIRTIO_GPU',
@@ -87,14 +99,19 @@ if config_all_devices.has_key('CONFIG_VIRTIO_VGA')
                     if_true: [files('virtio-vga.c'), pixman])
   virtio_vga_ss.add(when: 'CONFIG_VHOST_USER_VGA',
                     if_true: files('vhost-user-vga.c'))
+  virtio_vga_ss.add(when: 'CONFIG_ACPI', if_true: files('acpi-vga.c'),
+                                         if_false: files('acpi-vga-stub.c'))
   hw_display_modules += {'virtio-vga': virtio_vga_ss}
 
   virtio_vga_gl_ss = ss.source_set()
   virtio_vga_gl_ss.add(when: ['CONFIG_VIRTIO_VGA', virgl, opengl],
                        if_true: [files('virtio-vga-gl.c'), pixman])
+  virtio_vga_gl_ss.add(when: 'CONFIG_ACPI', if_true: files('acpi-vga.c'),
+                                            if_false: files('acpi-vga-stub.c'))
   hw_display_modules += {'virtio-vga-gl': virtio_vga_gl_ss}
 endif
 
 specific_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_lcdc.c'))
 
+softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-vga-stub.c'))
 modules += { 'hw-display': hw_display_modules }

hw/display/vga-pci.c

@@ -35,6 +35,7 @@
 #include "hw/loader.h"
 #include "hw/display/edid.h"
 #include "qom/object.h"
+#include "hw/acpi/acpi_aml_interface.h"
 
 enum vga_pci_flags {
     PCI_VGA_FLAG_ENABLE_MMIO = 1,
@@ -354,11 +355,13 @@ static void vga_pci_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
 
     k->vendor_id = PCI_VENDOR_ID_QEMU;
     k->device_id = PCI_DEVICE_ID_QEMU_VGA;
     dc->vmsd = &vmstate_vga_pci;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
+    adevc->build_dev_aml = build_vga_aml;
 }
 
 static const TypeInfo vga_pci_type_info = {
@@ -369,6 +372,7 @@ static const TypeInfo vga_pci_type_info = {
     .class_init = vga_pci_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { TYPE_ACPI_DEV_AML_IF },
         { },
     },
 };

hw/display/vga_int.h

@@ -30,6 +30,7 @@
 #include "ui/console.h"
 
 #include "hw/display/bochs-vbe.h"
+#include "hw/acpi/acpi_aml_interface.h"
 
 #define ST01_V_RETRACE      0x08
 #define ST01_DISP_ENABLE    0x01
@@ -195,4 +196,5 @@ void pci_std_vga_mmio_region_init(VGACommonState *s,
                                   MemoryRegion *subs,
                                   bool qext, bool edid);
 
+void build_vga_aml(AcpiDevAmlIf *adev, Aml *scope);
 #endif

hw/i386/acpi-build.c

@@ -430,7 +430,6 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
         bool hotpluggbale_slot = false;
         bool bridge_in_acpi = false;
         bool cold_plugged_bridge = false;
-        bool is_vga = false;
 
         if (pdev) {
             pc = PCI_DEVICE_GET_CLASS(pdev);
@@ -440,8 +439,6 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
                 continue;
             }
 
-            is_vga = pc->class_id == PCI_CLASS_DISPLAY_VGA;
-
             /*
              * Cold plugged bridges aren't themselves hot-pluggable.
              * Hotplugged bridges *are* hot-pluggable.
@@ -489,28 +486,7 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
             aml_append(dev, aml_pci_device_dsm());
         }
 
-        if (is_vga) {
-            /* add VGA specific AML methods */
-            int s3d;
-
-            if (object_dynamic_cast(OBJECT(pdev), "qxl-vga")) {
-                s3d = 3;
-            } else {
-                s3d = 0;
-            }
-
-            method = aml_method("_S1D", 0, AML_NOTSERIALIZED);
-            aml_append(method, aml_return(aml_int(0)));
-            aml_append(dev, method);
-
-            method = aml_method("_S2D", 0, AML_NOTSERIALIZED);
-            aml_append(method, aml_return(aml_int(0)));
-            aml_append(dev, method);
-
-            method = aml_method("_S3D", 0, AML_NOTSERIALIZED);
-            aml_append(method, aml_return(aml_int(s3d)));
-            aml_append(dev, method);
-        }
+        call_dev_aml_func(DEVICE(pdev), dev);
 
         bridge_in_acpi =  cold_plugged_bridge && pcihp_bridge_en;
         if (bridge_in_acpi) {