RE: [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding

Moore, Robert
2014-02-18T19:59:20Z

Maybe not exactly "running", but at the very least, ACPICA must be initialized.

All of this of course depends on how early the table needs to be loaded.

> -----Original Message-----
> From: Thomas Renninger [mailto:trenn@suse.de]
> Sent: Tuesday, February 18, 2014 10:53 AM
> To: Moore, Robert
> Cc: x86@kernel.org; ck@conrad-kostecki.de; linux-kernel@vger.kernel.org;
> mingo@redhat.com; hpa@zytor.com; tglx@linutronix.de; devel@acpica.org
> Subject: Re: [Devel] ACPI: Also allow ACPI table adding via initrd not
> only overriding
>
> On Tuesday, February 18, 2014 06:38:45 PM Moore, Robert wrote:
> > acpi_load_table won't work?
>
> I guess not, there is:
> /* Must acquire the interpreter lock during this operation */
> status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
>
> So the interpreter must be running already?
> That would mean the adding can only happen much later.
> This probably would eleminate most use cases for adding arbitrary ACPI
> tables. Most tables (beside DSDT and SSDT) are needed really early,
> otherwise the info could have been added as AML as well.
>
> Thomas
>
> > > -----Original Message-----
> > > From: Devel [mailto:devel-bounces@acpica.org] On Behalf Of Thomas
> > > Renninger
> > > Sent: Tuesday, February 18, 2014 10:23 AM
> > > Cc: x86@kernel.org; ck@conrad-kostecki.de;
> > > linux-kernel@vger.kernel.org; mingo@redhat.com; hpa@zytor.com;
> > > tglx@linutronix.de; devel@acpica.org
> > > Subject: [Devel] ACPI: Also allow ACPI table adding via initrd not
> > > only overriding
> > >
> > > The ACPICA patches have to go into separate acpica repository first.
> > > It should also be checked in acpica whether the table signature the
> > > OS likes to add already exists (from BIOS). In this case the table
> > > must not be added.
> > >
> > > Worked here by trying to override a DSDT and addind a BGRT table.
> > >
> > > Thomas
> > >
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