linux-kernel - Re: [PATCH v2 3/5] acpi/ghes: Use HEST table offsets when preparing GHES records

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Message-ID: <20241125120004.000041f1@huawei.com>
Date: Mon, 25 Nov 2024 12:00:04 +0000
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>,
	Ani Sinha <anisinha@...hat.com>, Dongjiu Geng <gengdongjiu1@...il.com>, Igor
 Mammedov <imammedo@...hat.com>, <linux-kernel@...r.kernel.org>,
	<qemu-arm@...gnu.org>, <qemu-devel@...gnu.org>
Subject: Re: [PATCH v2 3/5] acpi/ghes: Use HEST table offsets when preparing
 GHES records

On Fri, 22 Nov 2024 14:14:13 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> There are two pointers that are needed during error injection:
> 
> 1. The start address of the CPER block to be stored;
> 2. The address of the ack, which needs a reset before next error.
> 
> It is preferable to calculate them from the HEST table.  This allows
> checking the source ID, the size of the table and the type of the
> HEST error block structures.
> 
> Yet, keep the old code, as this is needed for migration purposes.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
Just repeat of the comment I failed to explain properly on previous version
about comment style.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

>  hw/acpi/ghes.c | 98 ++++++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 88 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index 680cada0e487..b5e3e2891445 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -61,6 +61,23 @@
>   */
>  #define ACPI_GHES_GESB_SIZE                 20
>  
> +/*
> + * Offsets with regards to the start of the HEST table stored at
> + * ags->hest_addr_le, according with the memory layout map at
> + * docs/specs/acpi_hest_ghes.rst.
> + */
> +
This was the bit I failed to explain in previous review.
I think for consistency it should be.

/*
 * ACPI 6.2: 18.3.2.8 Generic Hardware Error Source version 2
 * Table 18-382 Generic Hardware Error Source version 2 (GHESv2) Structure
 */
> +/* ACPI 6.2: 18.3.2.8 Generic Hardware Error Source version 2
> + * Table 18-382 Generic Hardware Error Source version 2 (GHESv2) Structure
> + */
> +#define HEST_GHES_V2_TABLE_SIZE  92
> +#define GHES_ACK_OFFSET          (64 + GAS_ADDR_OFFSET)
> +
> +/* ACPI 6.2: 18.3.2.7: Generic Hardware Error Source
Similar here.
> + * Table 18-380: 'Error Status Address' field
> + */
> +#define GHES_ERR_ST_ADDR_OFFSET  (20 + GAS_ADDR_OFFSET)
> +