Re: [PATCH 3/6] hw/acpi: Generic Port Affinity Structure support

[Markus Armbruster <armbru@redhat.com>]

Jonathan Cameron <Jonathan.Cameron@huawei.com> writes:

> These are very similar to the recently added Generic Initiators
> but instead of representing an initiator of memory traffic they
> represent an edge point beyond which may lie either targets or
> initiators.  Here we add these ports such that they may
> be targets of hmat_lb records to describe the latency and
> bandwidth from host side initiators to the port.  A descoverable
> mechanism such as UEFI CDAT read from CXL devices and switches
> is used to discover the remainder fo the path and the OS can build
> up full latency and bandwidth numbers as need for work and data
> placement decisions.
>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  qapi/qom.json                            |  18 +++
>  include/hw/acpi/acpi_generic_initiator.h |  18 ++-
>  include/hw/pci/pci_bridge.h              |   1 +
>  hw/acpi/acpi_generic_initiator.c         | 141 +++++++++++++++++------
>  hw/pci-bridge/pci_expander_bridge.c      |   1 -
>  5 files changed, 141 insertions(+), 38 deletions(-)
>
> diff --git a/qapi/qom.json b/qapi/qom.json
> index 85e6b4f84a..5480d9ca24 100644
> --- a/qapi/qom.json
> +++ b/qapi/qom.json
> @@ -826,6 +826,22 @@
>    'data': { 'pci-dev': 'str',
>              'node': 'uint32' } }
>  
> +
> +##
> +# @AcpiGenericPortProperties:
> +#
> +# Properties for acpi-generic-port objects.
> +#
> +# @pci-bus: PCI bus of the hostbridge associated with this SRAT entry

What's this exactly?  A QOM path?  A qdev ID?  Something else?

> +#
> +# @node: numa node associated with the PCI device

NUMA

Is this a NUMA node ID?

> +#
> +# Since: 9.1
> +##
> +{ 'struct': 'AcpiGenericPortProperties',
> +  'data': { 'pci-bus': 'str',
> +            'node': 'uint32' } }
> +
>  ##
>  # @RngProperties:
>  #
> @@ -944,6 +960,7 @@
>  { 'enum': 'ObjectType',
>    'data': [
>      'acpi-generic-initiator',
> +    'acpi-generic-port',
>      'authz-list',
>      'authz-listfile',
>      'authz-pam',
> @@ -1016,6 +1033,7 @@
>    'discriminator': 'qom-type',
>    'data': {
>        'acpi-generic-initiator':     'AcpiGenericInitiatorProperties',
> +      'acpi-generic-port':          'AcpiGenericPortProperties',
>        'authz-list':                 'AuthZListProperties',
>        'authz-listfile':             'AuthZListFileProperties',
>        'authz-pam':                  'AuthZPAMProperties',

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