tree 060545aaeff0bcc8f0ed3a53625377fb592b744c
parent ddab4d3fae4e8cb3b1d70c9f2364987ddc18c6a3
author Igor Mammedov <imammedo@redhat.com> 1673532174 +0100
committer Michael S. Tsirkin <mst@redhat.com> 1674904889 -0500

pcihp: do not put empty PCNT in DSDT

count number of PCNT methods that actually call Notify
and if there aren't any, drop PCNT altogether.
It mostly affects 'Q35' tests where there is no root-ports
/bridges attached and 'PC' machine when ACPI PCI hotplug is
completely disabled.

Expected ASL change:

-            Method (PCNT, 0, NotSerialized)
-            {
-            }
...
         Method (_E01, 0, NotSerialized)  // _Exx: Edge-Triggered GPE
         {
-            Acquire (\_SB.PCI0.BLCK, 0xFFFF)
-            \_SB.PCI0.PCNT ()
-            Release (\_SB.PCI0.BLCK)
         }

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230112140312.3096331-23-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>