On Thu, Sep 17, 2020 at 8:01 AM Igor Mammedov <imamm...@redhat.com> wrote:
>
> On Wed, 16 Sep 2020 21:14:36 +0200
> Julia Suvorova <jus...@redhat.com> wrote:
>
> > On Wed, Sep 16, 2020 at 8:03 PM Julia Suvorova <jus...@redhat.com> wrote:
> > >
> > > On Fri, Aug 21, 2020 at 2:13 PM Igor Mammedov <imamm...@redhat.com> wrote:
> > > >
> > > > On Tue, 18 Aug 2020 23:52:26 +0200
> > > > Julia Suvorova <jus...@redhat.com> wrote:
> > > >
> > > > > Other methods may be used if the system is capable of this and the
> > > > > _OSC bit
> > > > > is set. Disable them explicitly to force ACPI PCI hot-plug use. The
> > > > > older
> > > > > versions will still use PCIe native.
> > > > >
> > > > > Signed-off-by: Julia Suvorova <jus...@redhat.com>
> > > > > ---
> > > > > hw/i386/acpi-build.h | 11 +++++++++++
> > > > > hw/i386/acpi-build.c | 21 +++++++++++++++------
> > > > > 2 files changed, 26 insertions(+), 6 deletions(-)
> > > > >
> > > > > diff --git a/hw/i386/acpi-build.h b/hw/i386/acpi-build.h
> > > > > index 74df5fc612..6f94312c39 100644
> > > > > --- a/hw/i386/acpi-build.h
> > > > > +++ b/hw/i386/acpi-build.h
> > > > > @@ -5,6 +5,17 @@
> > > > >
> > > > > extern const struct AcpiGenericAddress x86_nvdimm_acpi_dsmio;
> > > > >
> > > > > +/* PCI Firmware Specification 3.2, Table 4-5 */
> > > > > +typedef enum {
> > > > > + ACPI_OSC_NATIVE_HP_EN = 0,
> > > > > + ACPI_OSC_SHPC_EN = 1,
> > > > > + ACPI_OSC_PME_EN = 2,
> > > > > + ACPI_OSC_AER_EN = 3,
> > > > > + ACPI_OSC_PCIE_CAP_EN = 4,
> > > > > + ACPI_OSC_LTR_EN = 5,
> > > > > + ACPI_OSC_ALLONES_INVALID = 6,
> > > > > +} AcpiOSCField;
> > > > > +
> > > > > void acpi_setup(void);
> > > > >
> > > > > #endif
> > > > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > > > > index f3cd52bd06..c5f4802b8c 100644
> > > > > --- a/hw/i386/acpi-build.c
> > > > > +++ b/hw/i386/acpi-build.c
> > > > > @@ -1411,7 +1411,7 @@ static void build_i386_pci_hotplug(Aml *table,
> > > > > uint64_t pcihp_addr)
> > > > > aml_append(table, scope);
> > > > > }
> > > > >
> > > > > -static Aml *build_q35_osc_method(void)
> > > > > +static Aml *build_q35_osc_method(AcpiPmInfo *pm)
> > > > > {
> > > > > Aml *if_ctx;
> > > > > Aml *if_ctx2;
> > > > > @@ -1419,6 +1419,7 @@ static Aml *build_q35_osc_method(void)
> > > > > Aml *method;
> > > > > Aml *a_cwd1 = aml_name("CDW1");
> > > > > Aml *a_ctrl = aml_local(0);
> > > > > + unsigned osc_ctrl;
> > > > >
> > > > > method = aml_method("_OSC", 4, AML_NOTSERIALIZED);
> > > > > aml_append(method, aml_create_dword_field(aml_arg(3),
> > > > > aml_int(0), "CDW1"));
> > > > > @@ -1430,11 +1431,19 @@ static Aml *build_q35_osc_method(void)
> > > > >
> > > > > aml_append(if_ctx, aml_store(aml_name("CDW3"), a_ctrl));
> > > > >
> > > > > + /* Always allow native PME, AER (depend on PCIE Capability
> > > > > Control) */
> > > > > + osc_ctrl = BIT(ACPI_OSC_PME_EN) | BIT(ACPI_OSC_AER_EN) |
> > > > > + BIT(ACPI_OSC_PCIE_CAP_EN);
> > > > > +
> > > > > /*
> > > > > - * Always allow native PME, AER (no dependencies)
> > > > > - * Allow SHPC (PCI bridges can have SHPC controller)
> > > > > + * Guests seem to generally prefer native hot-plug control.
> > > > > + * Enable it only when we do not use ACPI hot-plug.
> > > > > */
> > > > > - aml_append(if_ctx, aml_and(a_ctrl, aml_int(0x1F), a_ctrl));
> > > > > + if (!pm->pcihp_bridge_en) {
> > > > > + osc_ctrl |= BIT(ACPI_OSC_NATIVE_HP_EN) |
> > > > > BIT(ACPI_OSC_SHPC_EN);
> > > > > + }
> > > >
> > > > ACPI hotplug works only for coldplugged bridges, and native one is used
> > > > on hotplugged ones.
> > > > Wouldn't that break SHPC/Native hotplug on hotplugged PCI/PCI-E bridge?
> >
> > Wait, what configuration are you talking about exactly?
> Currently on piix4, we have ACPI and native hotplug working simultaneously
> the former works on cold-plugged bridges and if you hotplug another bridge,
> that one will use native method.
> With above hunk it probably will break.
Ok, I will add a check for piix4.
> >
> > > > > + aml_append(if_ctx, aml_and(a_ctrl, aml_int(osc_ctrl), a_ctrl));
> > > > >
> > > > > if_ctx2 = aml_if(aml_lnot(aml_equal(aml_arg(1), aml_int(1))));
> > > > > /* Unknown revision */
> > > > > @@ -1514,7 +1523,7 @@ build_dsdt(GArray *table_data, BIOSLinker
> > > > > *linker,
> > > > > aml_append(dev, aml_name_decl("_CID",
> > > > > aml_eisaid("PNP0A03")));
> > > > > aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> > > > > aml_append(dev, aml_name_decl("_UID", aml_int(1)));
> > > > > - aml_append(dev, build_q35_osc_method());
> > > > > + aml_append(dev, build_q35_osc_method(pm));
> > > > > aml_append(sb_scope, dev);
> > > > > aml_append(dsdt, sb_scope);
> > > > >
> > > > > @@ -1590,7 +1599,7 @@ build_dsdt(GArray *table_data, BIOSLinker
> > > > > *linker,
> > > > > if (pci_bus_is_express(bus)) {
> > > > > aml_append(dev, aml_name_decl("_HID",
> > > > > aml_eisaid("PNP0A08")));
> > > > > aml_append(dev, aml_name_decl("_CID",
> > > > > aml_eisaid("PNP0A03")));
> > > > > - aml_append(dev, build_q35_osc_method());
> > > > > + aml_append(dev, build_q35_osc_method(pm));
> > > > > } else {
> > > > > aml_append(dev, aml_name_decl("_HID",
> > > > > aml_eisaid("PNP0A03")));
> > > > > }
> > > >
> >
>
