[Qemu-devel] Re: [PATCH V5 18/29] pci: factor out the conversion logic from io port address into pci device.

[Michael S. Tsirkin]

On Fri, Oct 09, 2009 at 03:28:51PM +0900, Isaku Yamahata wrote:
> factor out the logic which converts io port address into pci device
> and offset in PCI configuration space.
> 
> Signed-off-by: Isaku Yamahata <address@hidden>
> ---
>  hw/pci.c |   32 ++++++++++++++++++--------------
>  1 files changed, 18 insertions(+), 14 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 33cc476..0021c96 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -654,24 +654,33 @@ void pci_default_write_config(PCIDevice *d, uint32_t 
> addr, uint32_t val, int l)
>          pci_update_mappings(d);
>  }
>  
> +static inline PCIDevice *pci_addr_to_dev(PCIBus *bus, uint32_t addr)
> +{
> +    uint8_t bus_num = (addr >> 16) & 0xff;
> +    uint8_t devfn = (addr >> 8) & 0xff;
> +    return pci_find_device(bus, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
> +}
> +
> +static inline int pci_addr_to_config(uint32_t addr)
> +{
> +    return addr & 0xff;
> +}

Replace 0xff with (PCI_CONFIG_SPACE - 1)?

> +
>  void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len)
>  {
>      PCIBus *s = opaque;
>      PCIDevice *pci_dev;
> -    int config_addr, bus_num;
> +    int config_addr;
>  
>  #if 0
>      PCI_DPRINTF("pci_data_write: addr=%08x val=%08x len=%d\n",
>                  addr, val, len);
>  #endif
> -    bus_num = (addr >> 16) & 0xff;
> -    s = pci_find_bus(s, bus_num);
> -    if (!s)
> -        return;
> -    pci_dev = s->devices[(addr >> 8) & 0xff];
> +    pci_dev = pci_addr_to_dev(s, addr);
>      if (!pci_dev)
>          return;
>      config_addr = addr & 0xff;
> +    config_addr = pci_addr_to_config(addr);
>      PCI_DPRINTF("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
>                  pci_dev->name, config_addr, val, len);
>      pci_dev->config_write(pci_dev, config_addr, val, len);
> @@ -681,16 +690,11 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int 
> len)
>  {
>      PCIBus *s = opaque;
>      PCIDevice *pci_dev;
> -    int config_addr, bus_num;
> +    int config_addr;
>      uint32_t val;
>  
> -    bus_num = (addr >> 16) & 0xff;
> -    s = pci_find_bus(s, bus_num);
> -    if (!s)
> -        goto fail;
> -    pci_dev = s->devices[(addr >> 8) & 0xff];
> +    pci_dev = pci_addr_to_dev(s, addr);
>      if (!pci_dev) {
> -    fail:
>          switch(len) {
>          case 1:
>              val = 0xff;
> @@ -705,7 +709,7 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int 
> len)
>          }
>          goto the_end;
>      }
> -    config_addr = addr & 0xff;
> +    config_addr = pci_addr_to_config(addr);
>      val = pci_dev->config_read(pci_dev, config_addr, len);
>      PCI_DPRINTF("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
>                  pci_dev->name, config_addr, val, len);
> -- 
> 1.6.0.2