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

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Message-ID: <20250123180135.4f86483f@imammedo.users.ipa.redhat.com>
Date: Thu, 23 Jan 2025 18:01:35 +0100
From: Igor Mammedov <imammedo@...hat.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, "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

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

> 
> >       * 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.

  
> 
> 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)

> 
> > +
> >      /* 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);
> >  }  
>