Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 5/5] pci: Fold pci_get_bus_devfn() into its sole caller

[Greg Kurz <groug@kaod.org>]

On Tue,  7 May 2019 16:23:16 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:

> The only remaining caller of pci_get_bus_devfn() is pci_nic_init_nofail(),
> itself an old compatibility function.  Fold the two together to avoid
> re-using the stale interface.
> 
> While we're there replace the explicit fprintf()s with error_report().
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  hw/pci/pci.c | 61 +++++++++++++++++++++++++---------------------------
>  1 file changed, 29 insertions(+), 32 deletions(-)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 7e5f8d001b..90e2743185 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -723,37 +723,6 @@ static int pci_parse_devaddr(const char *addr, int *domp, int *busp,
>      return 0;
>  }
>  
> -static PCIBus *pci_get_bus_devfn(int *devfnp, PCIBus *root,
> -                                 const char *devaddr)
> -{
> -    int dom, bus;
> -    unsigned slot;
> -
> -    if (!root) {
> -        fprintf(stderr, "No primary PCI bus\n");
> -        return NULL;
> -    }
> -
> -    assert(!root->parent_dev);
> -
> -    if (!devaddr) {
> -        *devfnp = -1;
> -        return pci_find_bus_nr(root, 0);
> -    }
> -
> -    if (pci_parse_devaddr(devaddr, &dom, &bus, &slot, NULL) < 0) {
> -        return NULL;
> -    }
> -
> -    if (dom != 0) {
> -        fprintf(stderr, "No support for non-zero PCI domains\n");
> -        return NULL;
> -    }
> -
> -    *devfnp = PCI_DEVFN(slot, 0);
> -    return pci_find_bus_nr(root, bus);
> -}
> -
>  static void pci_init_cmask(PCIDevice *dev)
>  {
>      pci_set_word(dev->cmask + PCI_VENDOR_ID, 0xffff);
> @@ -1895,6 +1864,8 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
>      DeviceState *dev;
>      int devfn;
>      int i;
> +    int dom, busnr;
> +    unsigned slot;
>  
>      if (nd->model && !strcmp(nd->model, "virtio")) {
>          g_free(nd->model);
> @@ -1928,7 +1899,33 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus,
>          exit(1);
>      }
>  
> -    bus = pci_get_bus_devfn(&devfn, rootbus, devaddr);
> +    if (!rootbus) {
> +        error_report("No primary PCI bus");
> +        exit(1);
> +    }
> +
> +    assert(!rootbus->parent_dev);
> +
> +    if (!devaddr) {
> +        devfn = -1;
> +        busnr = 0;
> +        bus = pci_find_bus_nr(rootbus, 0);

This line isn't needed since it is done below...

> +    } else {
> +        if (pci_parse_devaddr(devaddr, &dom, &busnr, &slot, NULL) < 0) {
> +            error_report("Invalid PCI device address %s for device %s",
> +                         devaddr, nd->model);
> +            exit(1);
> +        }
> +
> +        if (dom != 0) {
> +            error_report("No support for non-zero PCI domains");
> +            exit(1);
> +        }
> +
> +        devfn = PCI_DEVFN(slot, 0);
> +    }
> +
> +    bus = pci_find_bus_nr(rootbus, busnr);

... here.

>      if (!bus) {
>          error_report("Invalid PCI device address %s for device %s",
>                       devaddr, nd->model);

Maybe output a different message from the one for pci_parse_devaddr()
failures ? Here, the address is supposed to be well formatted but we
couldn't find the requested bus.