On Mon, 14 Oct 2024 16:52:55 +0800
maobibo <[email protected]> wrote:
> Hi Salil,
>
> When I debug cpu hotplug on LoongArch system, It reports error like this:
> ACPI BIOS Error (bug): Could not resolve symbol [\_SB.GED.CSCN],
> AE_NOT_FOUND
> ACPI Error: Aborting method \_SB.GED._EVT due to previous error
> (AE_NOT_FOUND)
> acpi-ged ACPI0013:00: IRQ method execution failed
>
>
> With this patch, GED CPU call method is "\\_SB.GED.CSCN", however in
> function build_cpus_aml(), its method name is "\\_SB.CPUS.CSCN".
> method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
> aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
> aml_append(table, method);
>
> It seems that CPU scanning method name is not consistent between
> function build_cpus_aml() and build_ged_aml().
>
> Regards
> Bibo Mao
>
> On 2024/7/23 下午6:59, Michael S. Tsirkin wrote:
> > From: Salil Mehta <[email protected]>
> >
> > OSPM evaluates _EVT method to map the event. The CPU hotplug event
> > eventually
> > results in start of the CPU scan. Scan figures out the CPU and the kind of
> > event(plug/unplug) and notifies it back to the guest. Update the GED AML
> > _EVT
> > method with the call to method \\_SB.CPUS.CSCN (via \\_SB.GED.CSCN)
> >
> > Architecture specific code [1] might initialize its CPUs AML code by calling
> > common function build_cpus_aml() like below for ARM:
> >
> > build_cpus_aml(scope, ms, opts, xx_madt_cpu_entry,
> > memmap[VIRT_CPUHP_ACPI].base,
> > "\\_SB", "\\_SB.GED.CSCN", AML_SYSTEM_MEMORY);
it should be \\_SB.CPUS.CSCN
> >
> > [1]
> > https://lore.kernel.org/qemu-devel/[email protected]/
> >
> > Co-developed-by: Keqian Zhu <[email protected]>
> > Signed-off-by: Keqian Zhu <[email protected]>
> > Signed-off-by: Salil Mehta <[email protected]>
> > Reviewed-by: Jonathan Cameron <[email protected]>
> > Reviewed-by: Gavin Shan <[email protected]>
> > Tested-by: Vishnu Pajjuri <[email protected]>
> > Tested-by: Xianglai Li <[email protected]>
> > Tested-by: Miguel Luis <[email protected]>
> > Reviewed-by: Shaoqin Huang <[email protected]>
> > Tested-by: Zhao Liu <[email protected]>
> > Reviewed-by: Igor Mammedov <[email protected]>
> > Message-Id: <[email protected]>
> > Reviewed-by: Michael S. Tsirkin <[email protected]>
> > Signed-off-by: Michael S. Tsirkin <[email protected]>
> > ---
> > include/hw/acpi/generic_event_device.h | 1 +
> > hw/acpi/generic_event_device.c | 3 +++
> > 2 files changed, 4 insertions(+)
> >
> > diff --git a/include/hw/acpi/generic_event_device.h
> > b/include/hw/acpi/generic_event_device.h
> > index e091ac2108..40af3550b5 100644
> > --- a/include/hw/acpi/generic_event_device.h
> > +++ b/include/hw/acpi/generic_event_device.h
> > @@ -87,6 +87,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(AcpiGedState, ACPI_GED)
> > #define GED_DEVICE "GED"
> > #define AML_GED_EVT_REG "EREG"
> > #define AML_GED_EVT_SEL "ESEL"
> > +#define AML_GED_EVT_CPU_SCAN_METHOD "\\_SB.GED.CSCN"
> >
> > /*
> > * Platforms need to specify the GED event bitmap
> > diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> > index 4641933a0f..15b4c3ebbf 100644
> > --- a/hw/acpi/generic_event_device.c
> > +++ b/hw/acpi/generic_event_device.c
> > @@ -108,6 +108,9 @@ void build_ged_aml(Aml *table, const char *name,
> > HotplugHandler *hotplug_dev,
> > aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
> > MEMORY_SLOT_SCAN_METHOD));
> > break;
> > + case ACPI_GED_CPU_HOTPLUG_EVT:
> > + aml_append(if_ctx, aml_call0(AML_GED_EVT_CPU_SCAN_METHOD));
> > + break;
> > case ACPI_GED_PWR_DOWN_EVT:
> > aml_append(if_ctx,
> > aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
> >
>
