[Qemu-devel] Re: [PATCH] pci-hotplug: make them aware of pci domain.

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

On Thu, May 27, 2010 at 02:47:42PM +0900, Isaku Yamahata wrote:
> add helper function which converts root bus to pci domain.
> make functions which ignored domain aware of pci domain.
> 
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> ---
>  hw/pci-hotplug.c |    7 ++++---
>  hw/pci.c         |   24 +++++++++++++++++++++++-
>  hw/pci.h         |    2 ++
>  3 files changed, 29 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
> index 37ac015..cbde02c 100644
> --- a/hw/pci-hotplug.c
> +++ b/hw/pci-hotplug.c
> @@ -124,7 +124,7 @@ 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(0), pci_bus, slot, 0);
> +        dev = pci_find_device(pci_find_root_bus(dom), pci_bus, slot, 0);
>          if (!dev) {
>              monitor_printf(mon, "no pci device with address %s\n", pci_addr);
>              goto err;
> @@ -252,7 +252,8 @@ void pci_device_hot_add(Monitor *mon, const QDict *qdict)
>  
>      if (dev) {
>          monitor_printf(mon, "OK domain %d, bus %d, slot %d, function %d\n",
> -                       0, pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
> +                       pci_find_domain_by_bus(dev->bus),
> +                       pci_bus_num(dev->bus), PCI_SLOT(dev->devfn),
>                         PCI_FUNC(dev->devfn));
>      } else
>          monitor_printf(mon, "failed to add %s\n", opts);
> @@ -269,7 +270,7 @@ int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
>          return -1;
>      }
>  
> -    d = pci_find_device(pci_find_root_bus(0), bus, slot, 0);
> +    d = pci_find_device(pci_find_root_bus(dom), bus, 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 39a6206..459593d 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -200,6 +200,28 @@ PCIBus *pci_find_root_bus(int domain)
>      return NULL;
>  }
>  
> +int pci_find_domain(const PCIBus *root_bus)
> +{
> +    struct PCIHostBus *host;
> +
> +    QLIST_FOREACH(host, &host_buses, next) {
> +        if (host->bus == root_bus) {
> +            return host->domain;
> +        }
> +    }
> +
> +    return -1;

assert? Each bus is in some domain, after all.

> +}
> +
> +int pci_find_domain_by_bus(const PCIBus *bus)
> +{
> +    PCIDevice *d;
> +    while ((d = bus->parent_dev) != NULL) {
> +        bus = d->bus;
> +    }
> +    return pci_find_domain(bus);
> +}
> +

I suggest removing pci_find_domain and renaming
pci_find_domain_by_bus to pci_find_domain.

>  void pci_bus_new_inplace(PCIBus *bus, DeviceState *parent,
>                           const char *name, int devfn_min)
>  {
> @@ -505,7 +527,7 @@ PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr)
>      }
>  
>      *devfnp = slot << 3;
> -    return pci_find_bus(pci_find_root_bus(0), bus);
> +    return pci_find_bus(pci_find_root_bus(dom), bus);
>  }
>  
>  static void pci_init_cmask(PCIDevice *dev)
> diff --git a/hw/pci.h b/hw/pci.h
> index b803593..c2b2188 100644
> --- a/hw/pci.h
> +++ b/hw/pci.h
> @@ -218,6 +218,8 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, const char *default_model,
>  int pci_bus_num(PCIBus *s);
>  void pci_for_each_device(PCIBus *bus, int bus_num, void (*fn)(PCIBus *bus, PCIDevice *d));
>  PCIBus *pci_find_root_bus(int domain);
> +int pci_find_domain(const PCIBus *root_bus);
> +int pci_find_domain_by_bus(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);
>  PCIBus *pci_get_bus_devfn(int *devfnp, const char *devaddr);
> -- 
> 1.6.6.1
>