On Mon, 14 Sep 2020 18:58:19 +0530
Ani Sinha <a...@anisinha.ca> wrote:
> On Mon, Sep 14, 2020 at 6:40 PM Ani Sinha <a...@anisinha.ca> wrote:
> >
> > On Mon, Sep 14, 2020 at 6:36 PM Igor Mammedov <imamm...@redhat.com> wrote:
> > >
> > > On Fri, 11 Sep 2020 23:37:55 +0530
> > > Ani Sinha <a...@anisinha.ca> wrote:
> > >
> > > > When acpi hotplug is turned off for both root pci bus as well as for pci
> > > > bridges, we should not generate the related amls for DSDT table or
> > > > initialize
> > > > related hw ports or reserve hw resources. This change makes sure all
> > > > those
> > > > operations are turned off in the case acpi pci hotplug is off globally.
> > > >
> > >
> > > it still leaves around pure PCI hotplug ACPI code:
> > >
> > > Method (PCNT, 0, NotSerialized)
> > > {
> > > }
> >
> > How do you suggest we fix this?
>
> One way to fix this would be to do this:
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 7e3cf3b57b..2bd0c37143 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -483,7 +483,8 @@ static void build_append_pci_bus_devices(Aml
> *parent_scope, PCIBus *bus,
> aml_append(method, aml_name("^S%.02X.PCNT", devfn));
> }
> }
> - aml_append(parent_scope, method);
> + if (bsel)
> + aml_append(parent_scope, method);
> qobject_unref(bsel);
> }
>
> This means that if the hotplug on the root bus is disabled, we also
> disable PCNT. This will also need the unit test update as the unit
Does bridge hot-plug still work if we disable it only on root bus?
> test
> will fail with :
>
> @@ -3113,24 +3113,20 @@
> Name (_ADR, 0x00010000) // _ADR: Address
> Method (_S1D, 0, NotSerialized) // _S1D: S1 Device State
> {
> Return (Zero)
> }
>
> Method (_S2D, 0, NotSerialized) // _S2D: S2 Device State
> {
> Return (Zero)
> }
>
> Method (_S3D, 0, NotSerialized) // _S3D: S3 Device State
> {
> Return (Zero)
> }
> }
> -
> - Method (PCNT, 0, NotSerialized)
> - {
> - }
> }
> }
> }
>
> Let's fix this as a separate patch.
I'd rather fix up this patch, so it would do what it claims.
> >
> > > >
> > > > Signed-off-by: Ani Sinha <a...@anisinha.ca>
> > > > ---
> > > > hw/acpi/piix4.c | 6 ++++--
> > > > hw/i386/acpi-build.c | 10 ++++++++--
> > > > 2 files changed, 12 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> > > > index e6163bb6ce..b70b1f98af 100644
> > > > --- a/hw/acpi/piix4.c
> > > > +++ b/hw/acpi/piix4.c
> > > > @@ -596,8 +596,10 @@ static void
> > > > piix4_acpi_system_hot_add_init(MemoryRegion *parent,
> > > > "acpi-gpe0", GPE_LEN);
> > > > memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
> > > >
> > > > - acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
> > > > - s->use_acpi_hotplug_bridge);
> > > > + if (s->use_acpi_hotplug_bridge || s->use_acpi_root_pci_hotplug) {
> > > > + acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
> > > > + s->use_acpi_hotplug_bridge);
> > > > + }
> > > >
> > > > s->cpu_hotplug_legacy = true;
> > > > object_property_add_bool(OBJECT(s), "cpu-hotplug-legacy",
> > > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > > > index e079b686f5..7e3cf3b57b 100644
> > > > --- a/hw/i386/acpi-build.c
> > > > +++ b/hw/i386/acpi-build.c
> > > > @@ -95,6 +95,7 @@ typedef struct AcpiPmInfo {
> > > > bool s3_disabled;
> > > > bool s4_disabled;
> > > > bool pcihp_bridge_en;
> > > > + bool pcihp_root_en;
> > > > uint8_t s4_val;
> > > > AcpiFadtData fadt;
> > > > uint16_t cpu_hp_io_base;
> > > > @@ -245,6 +246,9 @@ static void acpi_get_pm_info(MachineState *machine,
> > > > AcpiPmInfo *pm)
> > > > pm->pcihp_bridge_en =
> > > > object_property_get_bool(obj,
> > > > "acpi-pci-hotplug-with-bridge-support",
> > > > NULL);
> > > > + pm->pcihp_root_en =
> > > > + object_property_get_bool(obj, "acpi-root-pci-hotplug",
> > > > + NULL);
> > > > }
> > > >
> > > > static void acpi_get_misc_info(AcpiMiscInfo *info)
> > > > @@ -1504,7 +1508,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > > > build_hpet_aml(dsdt);
> > > > build_piix4_isa_bridge(dsdt);
> > > > build_isa_devices_aml(dsdt);
> > > > - build_piix4_pci_hotplug(dsdt);
> > > > + if (pm->pcihp_bridge_en || pm->pcihp_root_en) {
> > > > + build_piix4_pci_hotplug(dsdt);
> > > > + }
> > > > build_piix4_pci0_int(dsdt);
> > > > } else {
> > > > sb_scope = aml_scope("_SB");
> > > > @@ -1698,7 +1704,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > > > crs_range_set_free(&crs_range_set);
> > > >
> > > > /* reserve PCIHP resources */
> > > > - if (pm->pcihp_io_len) {
> > > > + if (pm->pcihp_io_len && (pm->pcihp_bridge_en ||
> > > > pm->pcihp_root_en)) {
> > > > dev = aml_device("PHPR");
> > > > aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A06")));
> > > > aml_append(dev,
> > >
>
