Re: [Xen-devel] [v4][PATCH 3/5] I440FX_PCI_DEVICE: add pci_type to index

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

On Wed, Aug 06, 2014 at 06:17:02PM +0800, Chen, Tiejun wrote:
> On 2014/8/6 17:45, Michael S. Tsirkin wrote:
> >On Wed, Aug 06, 2014 at 02:50:33PM +0800, Tiejun Chen wrote:
> >>We need to use this index to reuse this macro later
> >>
> >>Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> >
> >Which index?
> >Most users don't need to change.
> >Just open-code OBJECT_CHECK where necessary, or add
> >a new wrapper.
> 
> Okay so what about this?
> 
>     hw:pci-host:piix: define I440FX_PCI_DEVICE_FROM_TYPE
> 
>     We need to introduce I440FX_PCI_DEVICE_FROM_TYPE to get
>     object with type, then we can reuse i440fx_init() simply.
> 
>     Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> 
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index 0cd82b8..8c74653 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -93,6 +93,9 @@ typedef struct PIIX3State {
>  #define I440FX_PCI_DEVICE(obj) \
>      OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
> 
> +#define I440FX_PCI_DEVICE_FROM_TYPE(obj, type) \
> +    OBJECT_CHECK(PCII440FXState, (obj), type)

This is just wrong. If you are casting to PCII440FXState,
there is no reason not to use TYPE_I440FX_PCI_DEVICE.

> +
>  struct PCII440FXState {
>      /*< private >*/
>      PCIDevice parent_obj;
> @@ -333,7 +336,7 @@ PCIBus *i440fx_init(const char *host_type, const char
> *pci_type,
>      qdev_init_nofail(dev);
> 
>      d = pci_create_simple(b, 0, pci_type);
> -    *pi440fx_state = I440FX_PCI_DEVICE(d);
> +    *pi440fx_state = I440FX_PCI_DEVICE_FROM_TYPE(d, pci_type);
>      f = *pi440fx_state;
>      f->system_memory = address_space_mem;
>      f->pci_address_space = pci_address_space;
> 
> 
> Thanks
> Tiejun
> 
> >
> >>---
> >>  hw/pci-host/piix.c | 10 +++++-----
> >>  1 file changed, 5 insertions(+), 5 deletions(-)
> >>
> >>v4:
> >>
> >>* New patch to extend I440FX_PCI_DEVICE
> >>
> >>diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> >>index 0cd82b8..4330599 100644
> >>--- a/hw/pci-host/piix.c
> >>+++ b/hw/pci-host/piix.c
> >>@@ -90,8 +90,8 @@ typedef struct PIIX3State {
> >>      MemoryRegion rcr_mem;
> >>  } PIIX3State;
> >>
> >>-#define I440FX_PCI_DEVICE(obj) \
> >>-    OBJECT_CHECK(PCII440FXState, (obj), TYPE_I440FX_PCI_DEVICE)
> >>+#define I440FX_PCI_DEVICE(obj, type) \
> >>+    OBJECT_CHECK(PCII440FXState, (obj), type)
> >>
> >>  struct PCII440FXState {
> >>      /*< private >*/
> >>@@ -155,7 +155,7 @@ static void i440fx_set_smm(int val, void *arg)
> >>  static void i440fx_write_config(PCIDevice *dev,
> >>                                  uint32_t address, uint32_t val, int len)
> >>  {
> >>-    PCII440FXState *d = I440FX_PCI_DEVICE(dev);
> >>+    PCII440FXState *d = I440FX_PCI_DEVICE(dev, TYPE_I440FX_PCI_DEVICE);
> >>
> >>      /* XXX: implement SMRAM.D_LOCK */
> >>      pci_default_write_config(dev, address, val, len);
> >>@@ -295,7 +295,7 @@ static void i440fx_pcihost_realize(DeviceState *dev, 
> >>Error **errp)
> >>
> >>  static int i440fx_initfn(PCIDevice *dev)
> >>  {
> >>-    PCII440FXState *d = I440FX_PCI_DEVICE(dev);
> >>+    PCII440FXState *d = I440FX_PCI_DEVICE(dev, TYPE_I440FX_PCI_DEVICE);
> >>
> >>      dev->config[I440FX_SMRAM] = 0x02;
> >>
> >>@@ -333,7 +333,7 @@ PCIBus *i440fx_init(const char *host_type, const char 
> >>*pci_type,
> >>      qdev_init_nofail(dev);
> >>
> >>      d = pci_create_simple(b, 0, pci_type);
> >>-    *pi440fx_state = I440FX_PCI_DEVICE(d);
> >>+    *pi440fx_state = I440FX_PCI_DEVICE(d, pci_type);
> >>      f = *pi440fx_state;
> >>      f->system_memory = address_space_mem;
> >>      f->pci_address_space = pci_address_space;
> >>--
> >>1.9.1
> >
> >

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