Hi Bibo,
> From: maobibo <maob...@loongson.cn>
> Sent: Monday, October 14, 2024 9:53 AM
> To: qemu-devel@nongnu.org; Salil Mehta <salil.me...@huawei.com>
> Cc: Michael S. Tsirkin <m...@redhat.com>; Peter Maydell
> <peter.mayd...@linaro.org>; Salil Mehta <salil.me...@huawei.com>;
> zhukeqian <zhukeqi...@huawei.com>; Jonathan Cameron
> <jonathan.came...@huawei.com>; Gavin Shan <gs...@redhat.com>;
> Vishnu Pajjuri <vis...@os.amperecomputing.com>; Xianglai Li
> <lixiang...@loongson.cn>; Miguel Luis <miguel.l...@oracle.com>; Shaoqin
> Huang <shahu...@redhat.com>; Zhao Liu <zhao1....@intel.com>; Igor
> Mammedov <imamm...@redhat.com>; Ani Sinha <anisi...@redhat.com>
> Subject: Re: [PULL v2 40/61] hw/acpi: Update GED _EVT method AML with
> CPU scan
>
> 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().
I believe your question stems from the following patch I've sent recently:
https://lore.kernel.org/qemu-devel/20241009031815.250096-16-salil.me...@huawei.com/
I’ve already proposed a fix for this issue. Does that not work for you?
Thanks
Salil.
>
> Regards
> Bibo Mao
>
> On 2024/7/23 下午6:59, Michael S. Tsirkin wrote:
> > From: Salil Mehta <salil.me...@huawei.com>
> >
> > 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);
> >
> > [1]
> > https://lore.kernel.org/qemu-devel/20240613233639.202896-13-salil.meht
> > a...@huawei.com/
> >
> > Co-developed-by: Keqian Zhu <zhukeqi...@huawei.com>
> > Signed-off-by: Keqian Zhu <zhukeqi...@huawei.com>
> > Signed-off-by: Salil Mehta <salil.me...@huawei.com>
> > Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>
> > Reviewed-by: Gavin Shan <gs...@redhat.com>
> > Tested-by: Vishnu Pajjuri <vis...@os.amperecomputing.com>
> > Tested-by: Xianglai Li <lixiang...@loongson.cn>
> > Tested-by: Miguel Luis <miguel.l...@oracle.com>
> > Reviewed-by: Shaoqin Huang <shahu...@redhat.com>
> > Tested-by: Zhao Liu <zhao1....@intel.com>
> > Reviewed-by: Igor Mammedov <imamm...@redhat.com>
> > Message-Id: <20240716111502.202344-5-salil.me...@huawei.com>
> > Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
> > Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
> > ---
> > 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),
> >
