linux-kernel - Re: [PATCH 02/11] acpi/ghes: add a firmware file with HEST address

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Message-ID: <20250128111257.74766c82@foz.lan>
Date: Tue, 28 Jan 2025 11:12:57 +0100
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Igor Mammedov <imammedo@...hat.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, "Michael S . Tsirkin"
 <mst@...hat.com>, Shiju Jose <shiju.jose@...wei.com>,
 <qemu-arm@...gnu.org>, <qemu-devel@...gnu.org>, Ani Sinha
 <anisinha@...hat.com>, Dongjiu Geng <gengdongjiu1@...il.com>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/11] acpi/ghes: add a firmware file with HEST address

Em Thu, 23 Jan 2025 18:01:35 +0100
Igor Mammedov <imammedo@...hat.com> escreveu:

> On Thu, 23 Jan 2025 10:02:17 +0000
> Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:
> 
> > On Wed, 22 Jan 2025 16:46:19 +0100
> > Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
> >   
> > > Store HEST table address at GPA, placing its content at
> > > hest_addr_le variable.
> > > 
> > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > >     
> > A few trivial things inline.
> > 
> > Jonathan
> >   
> > > ---
> > > 
> > > Change from v8:
> > > - hest_addr_lr is now pointing to the error source size and data.
> > > 
> > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>    
> > Bonus.  I guess you really like this patch :)  
> > > ---
> > >  hw/acpi/ghes.c         | 17 ++++++++++++++++-
> > >  include/hw/acpi/ghes.h |  1 +
> > >  2 files changed, 17 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> > > index 3f519ccab90d..34e3364d3fd8 100644
> > > --- a/hw/acpi/ghes.c
> > > +++ b/hw/acpi/ghes.c
> > > @@ -30,6 +30,7 @@
> > >  
> > >  #define ACPI_HW_ERROR_FW_CFG_FILE           "etc/hardware_errors"
> > >  #define ACPI_HW_ERROR_ADDR_FW_CFG_FILE      "etc/hardware_errors_addr"
> > > +#define ACPI_HEST_ADDR_FW_CFG_FILE          "etc/acpi_table_hest_addr"
> > >  
> > >  /* The max size in bytes for one error block */
> > >  #define ACPI_GHES_MAX_RAW_DATA_LENGTH   (1 * KiB)
> > > @@ -261,7 +262,7 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
> > >      }
> > >  
> > >      /*
> > > -     * tell firmware to write hardware_errors GPA into
> > > +     * Tell firmware to write hardware_errors GPA into    
> > 
> > Sneaky tidy up.  No problem with it in general but adding noise here, so if there
> > are others in the series maybe gather them up in a cleanup patch.  
> 
> +1

If Ok, I would prefer to keep this here, as there's no other cleanups
anymore, and writing a patch just for this seems overkill. Besides,
it replicates a comment with a similar content on this patch.

So, instead, if OK to you, I would prefer to add a comment about it at
the patch description.

> >   
> > >       * hardware_errors_addr fw_cfg, once the former has been initialized.
> > >       */
> > >      bios_linker_loader_write_pointer(linker, ACPI_HW_ERROR_ADDR_FW_CFG_FILE, 0,
> > > @@ -355,6 +356,8 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
> > >  
> > >      acpi_table_begin(&table, table_data);
> > >  
> > > +    int hest_offset = table_data->len;    
> should be unsigned, and better uint32_t
> but we have a zoo wrt type here all over the place.

Changed this one to uint32_t. 

> > Local style looks to be traditional C with definitions at top.  Maybe define
> > hest_offset up a few lines and just set it here?  
> 
> yep, it applies to whole QEMU (i.e. definitions only at the start of the block)

Good to know. That's my personal style too. Yet, I guess I saw somewhere
other places declaring variables in the middle of the code. 

> > > +
> > >      /* Error Source Count */
> > >      build_append_int_noprefix(table_data, num_sources, 4);
> > >      for (i = 0; i < num_sources; i++) {
> > > @@ -362,6 +365,15 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
> > >      }
> > >  
> > >      acpi_table_end(linker, &table);
> > > +
> > > +    /*
> > > +     * tell firmware to write into GPA the address of HEST via fw_cfg,    
> > 
> > Given the tidy up above, fix this one to have a capital T, or was this
> > where you meant to change it?
> >   
> > > +     * once initialized.
> > > +     */
> > > +    bios_linker_loader_write_pointer(linker,
> > > +                                     ACPI_HEST_ADDR_FW_CFG_FILE, 0,    
> > 
> > Could wrap less and stay under 80 chars as both lines above add up to 70 something
> >   
> > > +                                     sizeof(uint64_t),
> > > +                                     ACPI_BUILD_TABLE_FILE, hest_offset);
> > >  }    
> >   
> 



Thanks,
Mauro