[Qemu-devel] [PATCH v4 07/10] piix3 piix4: Clean up use of cannot_instantiate_with_device_add_yet

[armbru@redhat.com]

From: Markus Armbruster <armbru@redhat.com>

A PIIX3/PIIX4 southbridge has multiple functions.  We model each
function as a separate qdev.  Two of them need some special wiring set
up in pc_init1() or mips_malta_init() to work: the ISA bridge at 01.0,
and the SMBus controller at 01.3.

The IDE controller at 01.1 (piix3-ide, piix3-ide-xen, piix4-ide) has
always had cannot_instantiate_with_device_add_yet set, but there is no
obvious reason why device_add could not work for them.  Drop it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
---
 hw/acpi/piix4.c    |  6 +++++-
 hw/ide/piix.c      |  3 ---
 hw/isa/piix4.c     |  6 +++++-
 hw/pci-host/piix.c | 12 ++++++++++--
 4 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index dd11534..9e8a89c 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -544,9 +544,13 @@ static void piix4_pm_class_init(ObjectClass *klass, void *data)
     k->revision = 0x03;
     k->class_id = PCI_CLASS_BRIDGE_OTHER;
     dc->desc = "PM";
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_acpi;
     dc->props = piix4_pm_properties;
+    /*
+     * Reason: part of PIIX4 southbridge, needs to be wired up,
+     * e.g. by mips_malta_init()
+     */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo piix4_pm_info = {
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index 27b08e1..9b5960b 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -248,7 +248,6 @@ static void piix3_ide_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_1;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo piix3_ide_info = {
@@ -267,7 +266,6 @@ static void piix3_ide_xen_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_1;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->unplug = pci_piix3_xen_ide_unplug;
 }
 
@@ -289,7 +287,6 @@ static void piix4_ide_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB;
     k->class_id = PCI_CLASS_STORAGE_IDE;
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
 }
 
 static const TypeInfo piix4_ide_info = {
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index d9dac61..def6fe3 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -113,8 +113,12 @@ static void piix4_class_init(ObjectClass *klass, void *data)
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
     k->class_id = PCI_CLASS_BRIDGE_ISA;
     dc->desc = "ISA bridge";
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     dc->vmsd = &vmstate_piix4;
+    /*
+     * Reason: part of PIIX4 southbridge, needs to be wired up,
+     * e.g. by mips_malta_init()
+     */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo piix4_info = {
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 38ca7b7..a9351dd 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -653,7 +653,6 @@ static void piix3_class_init(ObjectClass *klass, void *data)
 
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     k->no_hotplug   = 1;
     k->init         = piix3_initfn;
     k->config_write = piix3_write_config;
@@ -661,6 +660,11 @@ static void piix3_class_init(ObjectClass *klass, void *data)
     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
     k->device_id    = PCI_DEVICE_ID_INTEL_82371SB_0;
     k->class_id     = PCI_CLASS_BRIDGE_ISA;
+    /*
+     * Reason: part of PIIX3 southbridge, needs to be wired up by
+     * pc_piix.c's pc_init1()
+     */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo piix3_info = {
@@ -677,7 +681,6 @@ static void piix3_xen_class_init(ObjectClass *klass, void *data)
 
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
-    dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why */
     k->no_hotplug   = 1;
     k->init         = piix3_initfn;
     k->config_write = piix3_write_config_xen;
@@ -685,6 +688,11 @@ static void piix3_xen_class_init(ObjectClass *klass, void *data)
     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
     k->device_id    = PCI_DEVICE_ID_INTEL_82371SB_0;
     k->class_id     = PCI_CLASS_BRIDGE_ISA;
+    /*
+     * Reason: part of PIIX3 southbridge, needs to be wired up by
+     * pc_piix.c's pc_init1()
+     */
+    dc->cannot_instantiate_with_device_add_yet = true;
 };
 
 static const TypeInfo piix3_xen_info = {
-- 
1.8.1.4