linux-kernel - Re: [PATCH v7 6/9] ACPI: APEI: EINJ: Add einjv2 extension struct

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Message-ID: <aDdYPf-4ru_cC-_D@agluck-desk3>
Date: Wed, 28 May 2025 11:38:53 -0700
From: "Luck, Tony" <tony.luck@...el.com>
To: Zaid Alali <zaidal@...amperecomputing.com>
Cc: rafael@...nel.org, lenb@...nel.org, james.morse@....com, bp@...en8.de,
	robert.moore@...el.com, Jonathan.Cameron@...wei.com,
	ira.weiny@...el.com, Benjamin.Cheatham@....com,
	dan.j.williams@...el.com, arnd@...db.de, Avadhut.Naik@....com,
	u.kleine-koenig@...gutronix.de, john.allen@....com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Subject: Re: [PATCH v7 6/9] ACPI: APEI: EINJ: Add einjv2 extension struct

On Tue, May 06, 2025 at 02:38:10PM -0700, Zaid Alali wrote:
> Add einjv2 extension struct and EINJv2 error types to prepare
> the driver for EINJv2 support. ACPI specifications[1] enables
> EINJv2 by extending set_error_type_with_address struct.
> 
> Link: https://github.com/tianocore/edk2/issues/9449 [1]
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Zaid Alali <zaidal@...amperecomputing.com>
> ---
>  drivers/acpi/apei/einj-core.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
> index ee26df0398fc..60e4f3dc7055 100644
> --- a/drivers/acpi/apei/einj-core.c
> +++ b/drivers/acpi/apei/einj-core.c
> @@ -50,6 +50,28 @@
>   */
>  static int acpi5;
>  
> +struct syndrome_array {
> +	union {
> +		u8	acpi_id[16];
> +		u8	device_id[16];
> +		u8	pcie_sbdf[16];
> +		u8	vendor_id[16];
> +	} comp_id;
> +	union {
> +		u8	proc_synd[16];
> +		u8	mem_synd[16];
> +		u8	pcie_synd[16];
> +		u8	vendor_synd[16];
> +	} comp_synd;
> +};
> +
> +struct einjv2_extension_struct {
> +	u32 length;
> +	u16 revision;
> +	u16 component_arr_count;
> +	struct syndrome_array component_arr[] __counted_by(component_arr_count);
> +};
> +
>  struct set_error_type_with_address {
>  	u32	type;
>  	u32	vendor_extension;
> @@ -58,6 +80,7 @@ struct set_error_type_with_address {
>  	u64	memory_address;
>  	u64	memory_address_range;
>  	u32	pcie_sbdf;
> +	struct	einjv2_extension_struct einjv2_struct;

I can't make this match up with the ACPI v6.5 spec.  The spec defines
a whole new EINJV2_SET_ERROR_TYPE data structure in table 18.34 that
is NOT just a simple addition of new fields at the end of the existing
SET_ERROR_TYPE_WITH_ADDRESS data structure. E.g. the "flags" are now
in a 3-byte field at offset 5 instead of a 4-byte field at offset 8.
There is a new "length" field that descibes the total size of the
structure including the new flex array of syndrome values at the
end.

Shouldn't this look like this?

struct set_error_type_with_address_v2 {
	u32	type;
	u8	type_code;
	u8	flags[3];
	u32	length;
	u32	severity;
	u64	memory_address;
	u64	memory_address_range;
	u32	syndrome_count;
	struct syndrome_array syndrome syndromes[];
};

>  };
>  enum {
>  	SETWA_FLAGS_APICID = 1,
> -- 
> 2.43.0

-Tony