Re: [Qemu-devel] [PATCH 01/36] pci: Use struct instead of QDict to pass back parameters

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

On Wed, Nov 30, 2016 at 01:44:19PM -0600, Eric Blake wrote:
> It's simpler to just use a C struct than it is to bundle things
> into a QDict in one function just to pull them back out in the
> caller.  Plus, doing this gets rid of one more user of dynamic
> JSON through qobject_from_jsonf().
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>

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

> ---
>  hw/pci/pcie_aer.c | 36 +++++++++++++++++-------------------
>  1 file changed, 17 insertions(+), 19 deletions(-)
> 
> diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
> index 048ce6a..0735796 100644
> --- a/hw/pci/pcie_aer.c
> +++ b/hw/pci/pcie_aer.c
> @@ -43,6 +43,13 @@
>  #define PCI_ERR_SRC_COR_OFFS    0
>  #define PCI_ERR_SRC_UNCOR_OFFS  2
> 
> +typedef struct PCIEErrorInject {
> +    const char *id;
> +    const char *root_bus;
> +    int bus;
> +    int devfn;
> +} PCIEErrorInject;
> +
>  /* From 6.2.7 Error Listing and Rules. Table 6-2, 6-3 and 6-4 */
>  static uint32_t pcie_aer_uncor_default_severity(uint32_t status)
>  {
> @@ -946,7 +953,8 @@ static int pcie_aer_parse_error_string(const char *error_name,
>  }
> 
>  static int do_pcie_aer_inject_error(Monitor *mon,
> -                                    const QDict *qdict, QObject **ret_data)
> +                                    const QDict *qdict,
> +                                    PCIEErrorInject *ret_data)
>  {
>      const char *id = qdict_get_str(qdict, "id");
>      const char *error_name;
> @@ -1007,34 +1015,24 @@ static int do_pcie_aer_inject_error(Monitor *mon,
>      err.prefix[2] = qdict_get_try_int(qdict, "prefix2", 0);
>      err.prefix[3] = qdict_get_try_int(qdict, "prefix3", 0);
> 
> -    ret = pcie_aer_inject_error(dev, &err);
> -    *ret_data = qobject_from_jsonf("{'id': %s, "
> -                                   "'root_bus': %s, 'bus': %d, 'devfn': %d, "
> -                                   "'ret': %d}",
> -                                   id, pci_root_bus_path(dev),
> -                                   pci_bus_num(dev->bus), dev->devfn,
> -                                   ret);
> -    assert(*ret_data);
> +    pcie_aer_inject_error(dev, &err);
> +    ret_data->id = id;
> +    ret_data->root_bus = pci_root_bus_path(dev);
> +    ret_data->bus = pci_bus_num(dev->bus);
> +    ret_data->devfn = dev->devfn;
> 
>      return 0;
>  }
> 
>  void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict)
>  {
> -    QObject *data;
> -    int devfn;
> +    PCIEErrorInject data;
> 
>      if (do_pcie_aer_inject_error(mon, qdict, &data) < 0) {
>          return;
>      }
> 
> -    assert(qobject_type(data) == QTYPE_QDICT);
> -    qdict = qobject_to_qdict(data);
> -
> -    devfn = (int)qdict_get_int(qdict, "devfn");
>      monitor_printf(mon, "OK id: %s root bus: %s, bus: %x devfn: %x.%x\n",
> -                   qdict_get_str(qdict, "id"),
> -                   qdict_get_str(qdict, "root_bus"),
> -                   (int) qdict_get_int(qdict, "bus"),
> -                   PCI_SLOT(devfn), PCI_FUNC(devfn));
> +                   data.id, data.root_bus, data.bus,
> +                   PCI_SLOT(data.devfn), PCI_FUNC(data.devfn));
>  }
> -- 
> 2.7.4