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pcihp: drop pcihp_bridge_en dependency when composing PCNT method

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.. and use only BSEL presence to decide on how PCNT should be composed.
That simplifies possible combinations to consider, but mainly it makes
PCIHP AML be governed only by BSEL, which is property of PCIBus
(aka part of bridge) and as result it opens possibility to convert
build_append_pci_bus_devices() into AcpiDevAmlIf::build_dev_aml
callback to make bridges self describing.

PS:
used approach leaves unused PCNT, when ACPI hotplug is completely
disabled but that's harmless and followup commits will get rid of
it later.

     Scope (PCI0)
           ...
           Method (PCNT, 0, NotSerialized)
            {
            }
           ...
     }

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230112140312.3096331-19-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2023-01-12 15:02:50 +01:00 committed by Michael S. Tsirkin
parent 54836748fc
commit 19f5052ceb
1 changed files with 24 additions and 29 deletions
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13
hw/i386/acpi-build.c
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@ -494,11 +494,9 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
aml_append(parent_scope, notify_method);
}
/* Append PCNT method to notify about events on local and child buses.
* Add this method for root bus only when hotplug is enabled since DSDT
* expects it.
/*
* Append PCNT method to notify about events on local and child buses.
*/
if (bsel || pcihp_bridge_en) {
method = aml_method("PCNT", 0, AML_NOTSERIALIZED);
/* If bus supports hotplug select it and notify about local events */
@ -513,20 +511,17 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
}
/* Notify about child bus events in any case */
if (pcihp_bridge_en) {
QLIST_FOREACH(sec, &bus->child, sibling) {
if (pci_bus_is_root(sec) ||
!object_property_find(OBJECT(sec), ACPI_PCIHP_PROP_BSEL)) {
continue;
}
aml_append(method, aml_name("^S%.02X.PCNT",
sec->parent_dev->devfn));
}
aml_append(method, aml_name("^S%.02X.PCNT", sec->parent_dev->devfn));
}
aml_append(parent_scope, method);
}
qobject_unref(bsel);
}