linux-kernel - Re: [PATCH v5 4/7] acpi/ghes: Support GPIO error source

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Message-ID: <20240806113219.02ba0fdd@imammedo.users.ipa.redhat.com>
Date: Tue, 6 Aug 2024 11:32:19 +0200
From: Igor Mammedov <imammedo@...hat.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, Shiju Jose
 <shiju.jose@...wei.com>, "Michael S. Tsirkin" <mst@...hat.com>, Ani Sinha
 <anisinha@...hat.com>, Dongjiu Geng <gengdongjiu1@...il.com>,
 linux-kernel@...r.kernel.org, qemu-arm@...gnu.org, qemu-devel@...gnu.org
Subject: Re: [PATCH v5 4/7] acpi/ghes: Support GPIO error source

On Fri,  2 Aug 2024 23:43:59 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> Add error notification to GHES v2 using the GPIO source.
> 
> [mchehab: do some cleanups at ACPI_HEST_SRC_ID_* checks]
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  hw/acpi/ghes.c         | 16 ++++++++++------
>  include/hw/acpi/ghes.h |  3 ++-
>  2 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index 8d0262e6c1aa..a745dcc7be5e 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -34,8 +34,8 @@
>  /* The max size in bytes for one error block */
>  #define ACPI_GHES_MAX_RAW_DATA_LENGTH   (1 * KiB)
>  
> -/* Now only support ARMv8 SEA notification type error source */
> -#define ACPI_GHES_ERROR_SOURCE_COUNT        1
> +/* Support ARMv8 SEA notification type error source and GPIO interrupt. */
> +#define ACPI_GHES_ERROR_SOURCE_COUNT        2
>  
>  /* Generic Hardware Error Source version 2 */
>  #define ACPI_GHES_SOURCE_GENERIC_ERROR_V2   10
> @@ -290,6 +290,9 @@ void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
>  static void build_ghes_v2(GArray *table_data, int source_id, BIOSLinker *linker)
>  {
>      uint64_t address_offset;
> +
> +    assert(source_id < ACPI_HEST_SRC_ID_RESERVED);
> +
>      /*
>       * Type:
>       * Generic Hardware Error Source version 2(GHESv2 - Type 10)
> @@ -327,6 +330,9 @@ static void build_ghes_v2(GArray *table_data, int source_id, BIOSLinker *linker)
>           */
>          build_ghes_hw_error_notification(table_data, ACPI_GHES_NOTIFY_SEA);
>          break;
> +    case ACPI_HEST_SRC_ID_GPIO:
> +        build_ghes_hw_error_notification(table_data, ACPI_GHES_NOTIFY_GPIO);

perhaps ACPI_GHES_NOTIFY_EXTERNAL fits better here?

> +        break;
>      default:
>          error_report("Not support this error source");
>          abort();
> @@ -370,6 +376,7 @@ void acpi_build_hest(GArray *table_data, BIOSLinker *linker,
>      /* Error Source Count */
>      build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4);
>      build_ghes_v2(table_data, ACPI_HEST_SRC_ID_SEA, linker);
> +    build_ghes_v2(table_data, ACPI_HEST_SRC_ID_GPIO, linker);
>  
>      acpi_table_end(linker, &table);
>  }
> @@ -406,10 +413,7 @@ int acpi_ghes_record_errors(uint8_t source_id, uint64_t physical_address)
>      start_addr = le64_to_cpu(ags->ghes_addr_le);
>  
>      if (physical_address) {
> -
> -        if (source_id < ACPI_HEST_SRC_ID_RESERVED) {
> -            start_addr += source_id * sizeof(uint64_t);
> -        }
> +        start_addr += source_id * sizeof(uint64_t);

why check is being removed?

>  
>          cpu_physical_memory_read(start_addr, &error_block_addr,
>                                   sizeof(error_block_addr));
> diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
> index 6891eafff5ab..33be1eb5acf4 100644
> --- a/include/hw/acpi/ghes.h
> +++ b/include/hw/acpi/ghes.h
> @@ -59,9 +59,10 @@ enum AcpiGhesNotifyType {
>      ACPI_GHES_NOTIFY_RESERVED = 12
>  };
>  
> +/* Those are used as table indexes when building GHES tables */
>  enum {
>      ACPI_HEST_SRC_ID_SEA = 0,
> -    /* future ids go here */
> +    ACPI_HEST_SRC_ID_GPIO,
>      ACPI_HEST_SRC_ID_RESERVED,
>  };
>