linux-kernel - Re: [PATCH v7 01/10] acpi/generic_event

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Message-ID: <20240816075324.19d13670@foz.lan>
Date: Fri, 16 Aug 2024 07:53:24 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Shiju Jose <shiju.jose@...wei.com>, "Michael S. Tsirkin"
 <mst@...hat.com>, Ani Sinha <anisinha@...hat.com>, Igor Mammedov
 <imammedo@...hat.com>, <linux-kernel@...r.kernel.org>,
 <qemu-devel@...gnu.org>
Subject: Re: [PATCH v7 01/10] acpi/generic_event_device: add an APEI error
 device

Em Wed, 14 Aug 2024 13:33:21 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> escreveu:

> On Wed, 14 Aug 2024 01:23:23 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
> 
> > Adds a generic error device to handle generic hardware error
> > events as specified at ACPI 6.5 specification at 18.3.2.7.2:
> > https://uefi.org/specs/ACPI/6.5/18_Platform_Error_Interfaces.html#event-notification-for-generic-error-sources
> > using HID PNP0C33.
> > 
> > The PNP0C33 device is used to report hardware errors to
> > the guest via ACPI APEI Generic Hardware Error Source (GHES).
> > 
> > Co-authored-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > Co-authored-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > Reviewed-by: Igor Mammedov <imammedo@...hat.com>
> > ---
> >  hw/acpi/aml-build.c                    | 10 ++++++++++
> >  hw/acpi/generic_event_device.c         |  8 ++++++++
> >  include/hw/acpi/acpi_dev_interface.h   |  1 +
> >  include/hw/acpi/aml-build.h            |  2 ++
> >  include/hw/acpi/generic_event_device.h |  1 +
> >  5 files changed, 22 insertions(+)
> > 
> > diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> > index 6d4517cfbe3d..cb167523859f 100644
> > --- a/hw/acpi/aml-build.c
> > +++ b/hw/acpi/aml-build.c
> > @@ -2520,3 +2520,13 @@ Aml *aml_i2c_serial_bus_device(uint16_t address, const char *resource_source)
> >  
> >      return var;
> >  }
> > +
> > +/* ACPI 5.0: 18.3.2.6.2 Event Notification For Generic Error Sources */  
> 
> Given this section got a rename maybe the comment should mention old
> name and current name for the section?

ACPI 6.5 has the same name for the section:

	18.3.2.7.2. Event Notification For Generic Error Sources

	An event notification is recommended for corrected errors where latency 
	in processing error reports is not critical to proper system operation. 
	The implementation of Event notification requires the platform to define
	a device with PNP ID PNP0C33 in the ACPI namespace, referred to as the
	error device. 

Just section number changed. IMO, it is still good enough to seek for
it at the docs.

Btw, in this specific case, the best is to use the search box of
Sphinx html output and seek for PNP0C33 ;-)

> 
> > +Aml *aml_error_device(void)
> > +{
> > +    Aml *dev = aml_device(ACPI_APEI_ERROR_DEVICE);
> > +    aml_append(dev, aml_name_decl("_HID", aml_string("PNP0C33")));
> > +    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> > +
> > +    return dev;
> > +}
> > diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> > index 15b4c3ebbf24..1673e9695be3 100644
> > --- a/hw/acpi/generic_event_device.c
> > +++ b/hw/acpi/generic_event_device.c
> > @@ -26,6 +26,7 @@ static const uint32_t ged_supported_events[] = {
> >      ACPI_GED_PWR_DOWN_EVT,
> >      ACPI_GED_NVDIMM_HOTPLUG_EVT,
> >      ACPI_GED_CPU_HOTPLUG_EVT,
> > +    ACPI_GED_ERROR_EVT  
> 
> trailing comma missing.

I'll add.

Thanks,
Mauro