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

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Message-ID: <55C27122.8040604@redhat.com>
Date:	Wed, 5 Aug 2015 14:25:06 -0600
From:	Al Stone <ahs3@...hat.com>
To:	Graeme Gregory <graeme.gregory@...aro.org>, rjw@...ysocki.net,
	lenb@...nel.org, linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: 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@...hat.com
-----------------------------------
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