On Thu, 11 Jul 2024 14:23:16 +0200
Igor Mammedov <imamm...@redhat.com> wrote:
> On Thu, 11 Jul 2024 13:53:31 +0200
> Igor Mammedov <imamm...@redhat.com> wrote:
>
> > On Tue, 2 Jul 2024 14:14:10 +0100
> > Jonathan Cameron <jonathan.came...@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 <imamm...@redhat.com>
> > > Signed-off-by: Jonathan Cameron <jonathan.came...@huawei.com>
> > >
> > > ---
> > > V4: Avoid confusion with device creation parameter bus but renaming to
> > > busnr
> > > ---
> > > 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..f2711c91ef 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, "busnr", &error_fatal);
> > > + devfn = object_property_get_uint(o, "addr", &error_fatal);
> >
> > devfn in PCI code is 32bit, while here it's declared as unit8_t,
> > which seems wrong.
> > It likely would work in case of PCIe root ports/switches where slot is 0,
> > but should quickly break elsewhere as soon as slot is more than 0.
> >
> > If it's intentional, there should be fat comment here about why it this way
> > and an assert to catch silent cropping of the value.
>
> Ignore that, obviously the rest of the QEMU does not care about this downcast.
It's indeed odd that the storage is 32 bits.
>
> Maybe add assert anyways to catch too big devfn returned,
> which unlikely to happen ever.
Will do.
assert(devfn >= 0 && devfn < PCI_DEVFN_MAX);
with devfn locally as an int32_t and object_property_get_int()
to match with the type.
>
> anyways:
>
> Reviewed-by: Igor Mammedov <imamm...@redhat.com>
>
> >
> > > +
> > > + 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 50b86d5790..29d4852c21 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_busnr_get(Object *obj, Visitor *v, const char *name,
> > > + void *opaque, Error **errp)
> > > +{
> > > + uint8_t busnr = pci_dev_bus_num(PCI_DEVICE(obj));
> > > +
> > > + visit_type_uint8(v, name, &busnr, errp);
> > > +}
> > > +
> > > +static const PropertyInfo prop_pci_busnr = {
> > > + .name = "busnr",
> > > + .get = prop_pci_busnr_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 = "busnr", .info = &prop_pci_busnr },
> > > DEFINE_PROP_END_OF_LIST()
> > > };
> > >
> >
>
>
