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x86: pcihp: fix missing PCNT callchain when intermediate root-port has 'hotplug=off' set

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Beside BSEL numbers change (due to 2 extra root-ports in q35/miltibridge test),
following change is expected:

       Scope (\_SB.PCI0)
       {
  ...
  +        Scope (S50)
  +        {
  +            Scope (S00)
  +            {
  +                Method (PCNT, 0, NotSerialized)
  +                {
  +                    BNUM = Zero
  +                    DVNT (PCIU, One)
  +                    DVNT (PCID, 0x03)
  +                }
  +            }
  +
  +            Method (PCNT, 0, NotSerialized)
  +            {
  +                ^S00.PCNT
  +            }
  +        }
  ...
           Method (PCNT, 0, NotSerialized)
           {
  +            ^S50.PCNT ()
               ^S13.PCNT ()
               ^S12.PCNT ()
               ^S11.PCNT ()

I practice [1] hasn't broke anything since on hardware side we unset
hotplug_handler on such intermediate port => hotplug behind it has
not been properly wired and as result not worked.

1)
Fixes: ddab4d3fae4e8 ("pcihp: compose PCNT callchain right before its user _GPE._E01")
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-8-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 2023-03-02 17:15:16 +01:00 committed by Michael S. Tsirkin
parent 0c3bf7c431
commit 11215a349e
1 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
hw/i386/acpi-build.c
View File

@ -517,16 +517,24 @@ static bool build_append_notfication_callback(Aml *parent_scope,
PCIBus *sec;
QObject *bsel;
int nr_notifiers = 0;
GQueue *pcnt_bus_list = g_queue_new();
QLIST_FOREACH(sec, &bus->child, sibling) {
Aml *br_scope = aml_scope("S%.02X", sec->parent_dev->devfn);
if (pci_bus_is_root(sec) ||
!object_property_find(OBJECT(sec), ACPI_PCIHP_PROP_BSEL)) {
if (pci_bus_is_root(sec)) {
continue;
}
nr_notifiers = nr_notifiers +
build_append_notfication_callback(br_scope, sec);
aml_append(parent_scope, br_scope);
/*
* add new child scope to parent
* and keep track of bus that have PCNT,
* bus list is used later to call children PCNTs from this level PCNT
*/
if (nr_notifiers) {
g_queue_push_tail(pcnt_bus_list, sec);
aml_append(parent_scope, br_scope);
}
}
/*
@ -550,17 +558,13 @@ static bool build_append_notfication_callback(Aml *parent_scope,
}
/* Notify about child bus events in any case */
QLIST_FOREACH(sec, &bus->child, sibling) {
if (pci_bus_is_root(sec) ||
!object_property_find(OBJECT(sec), ACPI_PCIHP_PROP_BSEL)) {
continue;
}
while ((sec = g_queue_pop_head(pcnt_bus_list))) {
aml_append(method, aml_name("^S%.02X.PCNT", sec->parent_dev->devfn));
}
aml_append(parent_scope, method);
qobject_unref(bsel);
g_queue_free(pcnt_bus_list);
return !!nr_notifiers;
}