linux-kernel - Re: [PATCH v4 2/6] arm/virt: Wire up GPIO error source for ACPI / GHES

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Message-ID: <20240729170840.00004763@Huawei.com>
Date: Mon, 29 Jul 2024 17:08:40 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC: Shiju Jose <shiju.jose@...wei.com>, "Michael S. Tsirkin" <mst@...hat.com>,
	Philippe Mathieu-Daudé <philmd@...aro.org>, Ani Sinha
	<anisinha@...hat.com>, Eduardo Habkost <eduardo@...kost.net>, Igor Mammedov
	<imammedo@...hat.com>, "Marcel Apfelbaum" <marcel.apfelbaum@...il.com>, Peter
 Maydell <peter.maydell@...aro.org>, Shannon Zhao <shannon.zhaosl@...il.com>,
	"Yanan Wang" <wangyanan55@...wei.com>, Zhao Liu <zhao1.liu@...el.com>,
	<linux-kernel@...r.kernel.org>, <qemu-arm@...gnu.org>,
	<qemu-devel@...gnu.org>
Subject: Re: [PATCH v4 2/6] arm/virt: Wire up GPIO error source for ACPI /
 GHES

On Mon, 29 Jul 2024 15:21:06 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> Creates a Generic Event Device (GED) as specified at

I wrote this a while back and wasn't aware of the naming
mess around GED in the ACPI spec.  This one is just
referred to as 'error device' whereas there is also
a Generic Event Device.

Linux solved this clash by going with Hardware Error Device
I think we should do the same here.

> 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
> with HID PNP0C33.
> 
> The PNP0C33 device is used to report hardware errors to
> the bios via ACPI APEI Generic Hardware Error Source (GHES).
> 
> It is aligned with Linux Kernel patch:
> https://lore.kernel.org/lkml/1272350481-27951-8-git-send-email-ying.huang@intel.com/
> 
> [mchehab: use a define for the generic event pin number and do some cleanups]
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

> ---
>  hw/arm/virt-acpi-build.c | 30 ++++++++++++++++++++++++++----
>  hw/arm/virt.c            | 14 ++++++++++++--
>  include/hw/arm/virt.h    |  1 +
>  include/hw/boards.h      |  1 +
>  4 files changed, 40 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index f76fb117adff..c502ccf40909 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -63,6 +63,7 @@
>  
>  #define ARM_SPI_BASE 32
>  
> +#define ACPI_GENERIC_EVENT_DEVICE "GEDD"

Ah. My mistake. This is the confusing named GENERIC_ERROR_DEVICE
or HARDWARE_ERROR_DEVICE (which is what Linux called it because
in the ACPI Spec it is just (all lower case) error device).

>  #define ACPI_BUILD_TABLE_SIZE             0x20000

>  /* DSDT */
>  static void
>  build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
> @@ -841,10 +863,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>                        HOTPLUG_HANDLER(vms->acpi_dev),
>                        irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
>                        memmap[VIRT_ACPI_GED].base);
> -    } else {
> -        acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> -                           (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
>      }
> +    acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
> +                       (irqmap[VIRT_GPIO] + ARM_SPI_BASE));

Arguably excess brackets, but obviously this is just a code move
so fine to keep it the same.

>  
>      if (vms->acpi_dev) {
>          uint32_t event = object_property_get_uint(OBJECT(vms->acpi_dev),
> @@ -858,6 +879,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      }
>  
>      acpi_dsdt_add_power_button(scope);
> +    acpi_dsdt_add_generic_event_device(scope);
>  #ifdef CONFIG_TPM
>      acpi_dsdt_add_tpm(scope, vms);
>  #endif