Re: [PATCH v3 05/11] hw/pci: Add a bus property to pci_props and use for acpi/gi

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Fri, 28 Jun 2024 13:58:04 +0200
Igor Mammedov <imammedo@redhat.com> wrote:

> On Thu, 27 Jun 2024 15:09:12 +0200
> Igor Mammedov <imammedo@redhat.com> wrote:
> 
> > On Thu, 20 Jun 2024 17:03:13 +0100
> > Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote:
> >   
> > > Using a property allows us to hide the internal details of the PCI device
> > > from the code to build a SRAT Generic Initiator Affinity Structure with
> > > PCI Device Handle.
> > > 
> > > Suggested-by: Igor Mammedov <imammedo@redhat.com>
> > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > > 
> > > ---
> > > V3: New patch
> > > ---
> > >  hw/acpi/acpi_generic_initiator.c | 11 ++++++-----
> > >  hw/pci/pci.c                     | 14 ++++++++++++++
> > >  2 files changed, 20 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/hw/acpi/acpi_generic_initiator.c b/hw/acpi/acpi_generic_initiator.c
> > > index 73bafaaaea..34284359f0 100644
> > > --- a/hw/acpi/acpi_generic_initiator.c
> > > +++ b/hw/acpi/acpi_generic_initiator.c
> > > @@ -9,6 +9,7 @@
> > >  #include "hw/boards.h"
> > >  #include "hw/pci/pci_device.h"
> > >  #include "qemu/error-report.h"
> > > +#include "qapi/error.h"
> > >  
> > >  typedef struct AcpiGenericInitiatorClass {
> > >      ObjectClass parent_class;
> > > @@ -79,7 +80,7 @@ static int build_acpi_generic_initiator(Object *obj, void *opaque)
> > >      MachineState *ms = MACHINE(qdev_get_machine());
> > >      AcpiGenericInitiator *gi;
> > >      GArray *table_data = opaque;
> > > -    PCIDevice *pci_dev;
> > > +    uint8_t bus, devfn;
> > >      Object *o;
> > >  
> > >      if (!object_dynamic_cast(obj, TYPE_ACPI_GENERIC_INITIATOR)) {
> > > @@ -100,10 +101,10 @@ static int build_acpi_generic_initiator(Object *obj, void *opaque)
> > >          exit(1);
> > >      }
> > >  
> > > -    pci_dev = PCI_DEVICE(o);
> > > -    build_srat_pci_generic_initiator(table_data, gi->node, 0,
> > > -                                     pci_bus_num(pci_get_bus(pci_dev)),
> > > -                                     pci_dev->devfn);
> > > +    bus = object_property_get_uint(o, "bus", &error_fatal);
> > > +    devfn = object_property_get_uint(o, "addr", &error_fatal);
> > > +
> > > +    build_srat_pci_generic_initiator(table_data, gi->node, 0, bus, devfn);
> > >  
> > >      return 0;
> > >  }
> > > diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> > > index 324c1302d2..b4b499b172 100644
> > > --- a/hw/pci/pci.c
> > > +++ b/hw/pci/pci.c
> > > @@ -67,6 +67,19 @@ static char *pcibus_get_fw_dev_path(DeviceState *dev);
> > >  static void pcibus_reset_hold(Object *obj, ResetType type);
> > >  static bool pcie_has_upstream_port(PCIDevice *dev);
> > >  
> > > +static void prop_pci_bus_get(Object *obj, Visitor *v, const char *name,
> > > +                             void *opaque, Error **errp)
> > > +{
> > > +    uint8_t bus = pci_dev_bus_num(PCI_DEVICE(obj));
> > > +
> > > +    visit_type_uint8(v, name, &bus, errp);
> > > +}
> > > +
> > > +static const PropertyInfo prop_pci_bus = {
> > > +    .name = "bus",    
> > 
> > /me confused,
> > didn't we have 'bus' property for PCI devices already?
> > 
> > i.e. I can add PCI device like this
> >   -device e1000,bus=pci.0,addr=0x6,...  
> 
> to avoid confusion, I'd suggest to name it to 'busnr'
> (or be more specific (primary|secondary)_busnr if applicable)
For generic initiators we are always dealing with an EP so I think
busnr alone is appropriate. If we need similar for bridges we
can add that later.


> 
> >   
> >   
> > > +    .get = prop_pci_bus_get,
> > > +};
> > > +
> > >  static Property pci_props[] = {
> > >      DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1),
> > >      DEFINE_PROP_STRING("romfile", PCIDevice, romfile),
> > > @@ -85,6 +98,7 @@ static Property pci_props[] = {
> > >                      QEMU_PCIE_ERR_UNC_MASK_BITNR, true),
> > >      DEFINE_PROP_BIT("x-pcie-ari-nextfn-1", PCIDevice, cap_present,
> > >                      QEMU_PCIE_ARI_NEXTFN_1_BITNR, false),
> > > +    { .name = "bus", .info = &prop_pci_bus },
> > >      DEFINE_PROP_END_OF_LIST()
> > >  };
> > >      
> >   
> 
>