[Qemu-devel] Re: [PATCH 2/3] pci: use devfn for pci_find_device() instead of (slot, fn) pair

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

On Wed, Jan 26, 2011 at 06:45:19PM +0900, Isaku Yamahata wrote:
> (slot, fn) pair is somewhat confusing because of ARI.
> So use devfn for pci_find_device() instead of (slot, fn).
> 
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

I'd prefer using uint8_t for devfn. This way we don't need
to bother to range-check it either.

> ---
>  hw/pci-hotplug.c |    5 +++--
>  hw/pci.c         |    5 +++--
>  hw/pci.h         |    2 +-
>  hw/pci_host.c    |    2 +-
>  hw/pcie_host.c   |    3 +--
>  5 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
> index 270a982..9715235 100644
> --- a/hw/pci-hotplug.c
> +++ b/hw/pci-hotplug.c
> @@ -126,7 +126,8 @@ void drive_hot_add(Monitor *mon, const QDict *qdict)
>          if (pci_read_devaddr(mon, pci_addr, &dom, &pci_bus, &slot)) {
>              goto err;
>          }
> -        dev = pci_find_device(pci_find_root_bus(dom), pci_bus, slot, 0);
> +        dev = pci_find_device(pci_find_root_bus(dom), pci_bus,
> +                              PCI_DEVFN(slot, 0));
>          if (!dev) {
>              monitor_printf(mon, "no pci device with address %s\n", pci_addr);
>              goto err;
> @@ -276,7 +277,7 @@ static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
>          return -1;
>      }
>  
> -    d = pci_find_device(pci_find_root_bus(dom), bus, slot, 0);
> +    d = pci_find_device(pci_find_root_bus(dom), bus, PCI_DEVFN(slot, 0));
>      if (!d) {
>          monitor_printf(mon, "slot %d empty\n", slot);
>          return -1;
> diff --git a/hw/pci.c b/hw/pci.c
> index 79a46e7..ac16029 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -1599,14 +1599,15 @@ PCIBus *pci_find_bus(PCIBus *bus, int bus_num)
>      return NULL;
>  }
>  
> -PCIDevice *pci_find_device(PCIBus *bus, int bus_num, int slot, int function)
> +PCIDevice *pci_find_device(PCIBus *bus, int bus_num, int devfn)
>  {
> +    assert(devfn < PCI_DEVFN_MAX);
>      bus = pci_find_bus(bus, bus_num);
>  
>      if (!bus)
>          return NULL;
>  
> -    return bus->devices[PCI_DEVFN(slot, function)];
> +    return bus->devices[devfn];
>  }
>  
>  static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
> diff --git a/hw/pci.h b/hw/pci.h
> index ffb04e8..f6d20f6 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -253,7 +253,7 @@ void pci_for_each_device(PCIBus *bus, int bus_num, void (*fn)(PCIBus *bus, PCIDe
>  PCIBus *pci_find_root_bus(int domain);
>  int pci_find_domain(const PCIBus *bus);
>  PCIBus *pci_find_bus(PCIBus *bus, int bus_num);
> -PCIDevice *pci_find_device(PCIBus *bus, int bus_num, int slot, int function);
> +PCIDevice *pci_find_device(PCIBus *bus, int bus_num, int devfn);
>  int pci_qdev_find_device(const char *id, PCIDevice **pdev);
>  PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr);
>  
> diff --git a/hw/pci_host.c b/hw/pci_host.c
> index 7c40155..728e2d4 100644
> --- a/hw/pci_host.c
> +++ b/hw/pci_host.c
> @@ -44,7 +44,7 @@ static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
>      uint8_t bus_num = addr >> 16;
>      uint8_t devfn = addr >> 8;
>  
> -    return pci_find_device(bus, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
> +    return pci_find_device(bus, bus_num, devfn);
>  }
>  
>  void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
> diff --git a/hw/pcie_host.c b/hw/pcie_host.c
> index 21069ee..b749865 100644
> --- a/hw/pcie_host.c
> +++ b/hw/pcie_host.c
> @@ -49,8 +49,7 @@ static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
>                                                       uint32_t mmcfg_addr)
>  {
>      return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr),
> -                           PCI_SLOT(PCIE_MMCFG_DEVFN(mmcfg_addr)),
> -                           PCI_FUNC(PCIE_MMCFG_DEVFN(mmcfg_addr)));
> +                           PCIE_MMCFG_DEVFN(mmcfg_addr));
>  }
>  
>  static void pcie_mmcfg_data_write(PCIBus *s,
> -- 
> 1.7.1.1