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Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem

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  Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem Al Stone <ahs3@redhat.com> - 2015-08-05 22:30 +0200
    Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-08-06 01:20 +0200

#1201127 — Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem

On 07/21/2015 07:31 AM, Graeme Gregory wrote:
> Hi,
> 
> I thought I would send this patch as an RFC. It is something I did when
> another linaro engineer was modifying acpica-tools to not require /dev/mem.
> 
> It exports the 3 tables that are not currenly exported in sysfs.
> 
> Currently I do not think there is any user of this because acpica-tools can
> can recover the information in the other tables without these three being
> exported, fwts also works fine without the patch so the only use case I have
> is the vague "might be useful for debug"

Right -- and I personally would like to have that debug use case.  AFAICT,
the RSDP and RSDT/XSDT are recreated by acpidump; i.e., based on knowledge
of the mapped tables, acpidump builds what it believes these tables should
look like.  But, the /dev/mem mappings would give me what ACPI is actually
using (what was directly passed to the kernel).  Should there be a bug in
table mapping or ACPI startup, this info might help.

-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3@redhat.com
-----------------------------------
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#1201331

On Wednesday, August 05, 2015 02:25:06 PM Al Stone wrote:
> On 07/21/2015 07:31 AM, Graeme Gregory wrote:
> > Hi,
> > 
> > I thought I would send this patch as an RFC. It is something I did when
> > another linaro engineer was modifying acpica-tools to not require /dev/mem.
> > 
> > It exports the 3 tables that are not currenly exported in sysfs.
> > 
> > Currently I do not think there is any user of this because acpica-tools can
> > can recover the information in the other tables without these three being
> > exported, fwts also works fine without the patch so the only use case I have
> > is the vague "might be useful for debug"
> 
> Right -- and I personally would like to have that debug use case.  AFAICT,
> the RSDP and RSDT/XSDT are recreated by acpidump; i.e., based on knowledge
> of the mapped tables, acpidump builds what it believes these tables should
> look like.  But, the /dev/mem mappings would give me what ACPI is actually
> using (what was directly passed to the kernel).  Should there be a bug in
> table mapping or ACPI startup, this info might help.

If my memory serves me right, Lv has been doing something in that area.  Lv?

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