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authorIgor Mammedov <imammedo@redhat.com>2023-01-12 15:03:05 +0100
committerMichael S. Tsirkin <mst@redhat.com>2023-01-28 06:21:29 -0500
commit6fe5518e4fb75f6b3ae08d4b58da87fe8734a5de (patch)
tree172a5bfde2e23a2e825436e7deef6e03baffc7c6 /hw/i386/kvm/ioapic.c
parent2e827356dfa87156a944a83217f675f212294398 (diff)
pcihp: acpi: decouple hotplug and generic slots description
Split build_append_pci_bus_devices() onto generic part that builds AML descriptions only for populated slots which is applicable to both hotplug disabled and enabled bridges. And a hotplug only part that complements generic AML with hotplug depended bits (that depend on BSEL), like _SUN/_EJ0 entries, dynamic _DSM. Hotplug part, will generate full 'Device' descriptors for non-populated slots (like it used to be) and complementary 'Scope' descriptors for populated slots that are hotplug capable. i.e. something like this: - ... + Name (BSEL, 0x03) + Scope (S00) + { + Name (ASUN, Zero) + Method (_DSM, 4, Serialized) // _DSM: Device-Specific Method + { + Local0 = Package (0x02) + { + BSEL, + ASUN + } + Return (PDSM (Arg0, Arg1, Arg2, Arg3, Local0)) + } + [ ... other hotplug depended bits ] + } While generic build_append_pci_bus_devices() still calls hotplug part at its end it doesn't really depend on any hotplug bits anymore and later both could be completely separated when it's necessary. Main benefit though is that both build_append_pci_bus_devices() and build_append_pcihp_slots() become more readable and it makes easier to modify them with less risk of affecting another part. Also it opens possibility to re-use generic part elsewhere (microvm, arm/virt). Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20230112140312.3096331-34-imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/i386/kvm/ioapic.c')
0 files changed, 0 insertions, 0 deletions