Re: [Xen-devel] [v2][PATCH 2/5] hw:pci-host:piix: split i440fx_init

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

On Thu, Jul 31, 2014 at 05:26:41PM +0800, Chen, Tiejun wrote:
> On 2014/7/31 17:10, Michael S. Tsirkin wrote:
> >On Thu, Jul 31, 2014 at 02:31:36PM +0800, Tiejun Chen wrote:
> >>We'd like to split i440fx_init and then we can share something
> >>with other stuff.
> >>
> >>Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> >
> >I think this is too much work for very little benefit.
> >Just pass const char *type to i440fx_init.
> 
> You know we will introduce that faked PCIe device represented that PCH
> later,

Later when? On top of this patch series? Would like to see it all
before applying this ...

> so how to distinguish them? Are you saying I should check the type
> like this?
> 
> if(Xen-Type)
> {}
> else
> {}
>

No! Put the code in init function for the respective class,
pass type as an argument:

----
i440fx: make types configurable at run-time

Xen wants to supply a different pci and host devices,
inheriting i440fx devices. Make types configurable.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

-->
 
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index be8fdfe..86f295a 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -230,7 +230,11 @@ extern int no_hpet;
 struct PCII440FXState;
 typedef struct PCII440FXState PCII440FXState;
 
-PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn,
+#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
+#define TYPE_I440FX_PCI_DEVICE "i440FX"
+
+PCIBus *i440fx_init(const char *host_type, const char *pci_type,
+                    PCII440FXState **pi440fx_state, int *piix_devfn,
                     ISABus **isa_bus, qemu_irq *pic,
                     MemoryRegion *address_space_mem,
                     MemoryRegion *address_space_io,
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 31125b7..e0979cd 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -194,7 +194,9 @@ static void pc_init1(MachineState *machine,
     }
 
     if (pci_enabled) {
-        pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
+        pci_bus = i440fx_init(TYPE_I440FX_PCI_HOST_BRIDGE,
+                              TYPE_I440FX_PCI_DEVICE,
+                              &i440fx_state, &piix3_devfn, &isa_bus, gsi,
                               system_memory, system_io, machine->ram_size,
                               below_4g_mem_size,
                               above_4g_mem_size,
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index e0e0946..0cd82b8 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -40,7 +40,6 @@
  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
  */
 
-#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
 #define I440FX_PCI_HOST_BRIDGE(obj) \
     OBJECT_CHECK(I440FXState, (obj), TYPE_I440FX_PCI_HOST_BRIDGE)
 
@@ -91,7 +90,6 @@ typedef struct PIIX3State {
     MemoryRegion rcr_mem;
 } PIIX3State;
 
-#define TYPE_I440FX_PCI_DEVICE "i440FX"
 #define I440FX_PCI_DEVICE(obj) \
     OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
 
@@ -305,7 +303,8 @@ static int i440fx_initfn(PCIDevice *dev)
     return 0;
 }
 
-PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
+PCIBus *i440fx_init(const char *host_type, const char *pci_type,
+                    PCII440FXState **pi440fx_state,
                     int *piix3_devfn,
                     ISABus **isa_bus, qemu_irq *pic,
                     MemoryRegion *address_space_mem,
@@ -325,7 +324,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
     unsigned i;
     I440FXState *i440fx;
 
-    dev = qdev_create(NULL, TYPE_I440FX_PCI_HOST_BRIDGE);
+    dev = qdev_create(NULL, host_type);
     s = PCI_HOST_BRIDGE(dev);
     b = pci_bus_new(dev, NULL, pci_address_space,
                     address_space_io, 0, TYPE_PCI_BUS);
@@ -333,7 +332,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
     object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL);
     qdev_init_nofail(dev);
 
-    d = pci_create_simple(b, 0, TYPE_I440FX_PCI_DEVICE);
+    d = pci_create_simple(b, 0, pci_type);
     *pi440fx_state = I440FX_PCI_DEVICE(d);
     f = *pi440fx_state;
     f->system_memory = address_space_mem;

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