[Qemu-devel] Re: [PATCH V6 18/32] pci: remove bus_num member from struct PCIBus.

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Oct 30, 2009 at 09:21:12PM +0900, Isaku Yamahata wrote:
> Since It can be retrieved from pci configuration space,
> the member is unnecessary.
> 
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/pci.c |   21 ++++++++++-----------
>  1 files changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 7da3db9..a75d981 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -36,7 +36,6 @@
>  
>  struct PCIBus {
>      BusState qbus;
> -    int bus_num;
>      int devfn_min;
>      pci_set_irq_fn set_irq;
>      pci_map_irq_fn map_irq;
> @@ -192,7 +191,9 @@ static void pci_register_secondary_bus(PCIBus *bus,
>  
>  int pci_bus_num(PCIBus *s)
>  {
> -    return s->bus_num;
> +    if (!s->parent_dev)
> +        return 0;       /* pci host bridge */
> +    return s->parent_dev->config[PCI_SECONDARY_BUS];
>  }
>  
>  static int get_pci_config_device(QEMUFile *f, void *pv, size_t size)
> @@ -624,7 +625,7 @@ void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len)
>                  addr, val, len);
>  #endif
>      bus_num = (addr >> 16) & 0xff;
> -    while (s && s->bus_num != bus_num)
> +    while (s && pci_bus_num(s) != bus_num)
>          s = s->next;
>      if (!s)
>          return;
> @@ -645,7 +646,7 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
>      uint32_t val;
>  
>      bus_num = (addr >> 16) & 0xff;
> -    while (s && s->bus_num != bus_num)
> +    while (s && pci_bus_num(s) != bus_num)
>          s= s->next;
>      if (!s)
>          goto fail;
> @@ -760,7 +761,8 @@ static void pci_info_device(PCIDevice *d)
>      const pci_class_desc *desc;
>  
>      monitor_printf(mon, "  Bus %2d, device %3d, function %d:\n",
> -                   d->bus->bus_num, PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
> +                   pci_bus_num(d->bus),
> +                   PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
>      class = pci_get_word(d->config + PCI_CLASS_DEVICE);
>      monitor_printf(mon, "    ");
>      desc = pci_class_descriptions;
> @@ -816,7 +818,7 @@ void pci_for_each_device(int bus_num, void (*fn)(PCIDevice *d))
>      PCIDevice *d;
>      int devfn;
>  
> -    while (bus && bus->bus_num != bus_num)
> +    while (bus && pci_bus_num(bus) != bus_num)
>          bus = bus->next;
>      if (bus) {
>          for(devfn = 0; devfn < 256; devfn++) {
> @@ -913,17 +915,14 @@ typedef struct {
>  static void pci_bridge_write_config(PCIDevice *d,
>                               uint32_t address, uint32_t val, int len)
>  {
> -    PCIBridge *s = (PCIBridge *)d;
> -
>      pci_default_write_config(d, address, val, len);
> -    s->bus.bus_num = d->config[PCI_SECONDARY_BUS];
>  }
>  
>  PCIBus *pci_find_bus(int bus_num)
>  {
>      PCIBus *bus = first_bus;
>  
> -    while (bus && bus->bus_num != bus_num)
> +    while (bus && pci_bus_num(bus) != bus_num)
>          bus = bus->next;
>  
>      return bus;
> @@ -1149,7 +1148,7 @@ static void pcibus_dev_print(Monitor *mon, DeviceState *dev, int indent)
>      monitor_printf(mon, "%*sclass %s, addr %02x:%02x.%x, "
>                     "pci id %04x:%04x (sub %04x:%04x)\n",
>                     indent, "", ctxt,
> -                   d->bus->bus_num, PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
> +                   pci_bus_num(d->bus), PCI_SLOT(d->devfn), PCI_FUNC(d->devfn),
>                     pci_get_word(d->config + PCI_VENDOR_ID),
>                     pci_get_word(d->config + PCI_DEVICE_ID),
>                     pci_get_word(d->config + PCI_SUBSYSTEM_VENDOR_ID),
> -- 
> 1.6.0.2