linux-kernel - Re: [PATCH v4 6/9] ACPI: APEI: EINJ: Add einjv2 extension struct

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Message-ID: <Z9M6ryapTGlBWA3Q@zaid-VirtualBox>
Date: Thu, 13 Mar 2025 13:06:07 -0700
From: Zaid Alali <zaidal@...amperecomputing.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: rafael@...nel.org, lenb@...nel.org, james.morse@....com,
	tony.luck@...el.com, bp@...en8.de, robert.moore@...el.com,
	dan.j.williams@...el.com, Benjamin.Cheatham@....com,
	Avadhut.Naik@....com, viro@...iv.linux.org.uk, arnd@...db.de,
	ira.weiny@...el.com, dave.jiang@...el.com,
	sthanneeru.opensrc@...ron.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, acpica-devel@...ts.linux.dev
Subject: Re: [PATCH v4 6/9] ACPI: APEI: EINJ: Add einjv2 extension struct

On Thu, Mar 13, 2025 at 09:42:30AM +0000, Jonathan Cameron wrote:
> On Thu,  6 Mar 2025 15:48:07 -0800
> Zaid Alali <zaidal@...amperecomputing.com> 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.
> > 
> > (1) https://bugzilla.tianocore.org/show_bug.cgi?id=4615
> Still seems to be down.
> Also, we have tag for this.
> > 
> > Signed-off-by: Zaid Alali <zaidal@...amperecomputing.com>
> 
> Link: https://bugzilla.tianocore.org/show_bug.cgi?id=4615 # [1]
> 
> 
> One additional request inline.
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.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 aee9a7b17313..32b8d102f399 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 {
> > +		u32	acpi_id;
> > +		u32	device_id;
> > +		u32	pcie_sbdf;
> > +		u8	vendor_id[16];
> > +	} comp_id;
> > +	union {
> > +		u32	proc_synd;
> > +		u32	mem_synd;
> > +		u32	pcie_synd;
> > +		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);
> should be fine and marking these is always good to do in
> new code (and old code if you have time!)

I am not sure if __counted_by is appropriate here. Please note that component_arr_count
is set by the user and does NOT represent the size of the component_arr[].
> 
> 
> > +};
> > +
> >  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;
> >  };
> >  enum {
> >  	SETWA_FLAGS_APICID = 1,
>