linux-kernel - Re: [PATCH RFC v3 13/21] ACPICA: Add new MADT GICC flags fields

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Date: Mon, 18 Dec 2023 14:14:30 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
	linux-pm@...r.kernel.org, loongarch@...ts.linux.dev, 
	linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev, x86@...nel.org, 
	acpica-devel@...ts.linuxfoundation.org, linux-csky@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-ia64@...r.kernel.org, 
	linux-parisc@...r.kernel.org, Salil Mehta <salil.mehta@...wei.com>, 
	Jean-Philippe Brucker <jean-philippe@...aro.org>, jianyong.wu@....com, justin.he@....com, 
	James Morse <james.morse@....com>
Subject: Re: [PATCH RFC v3 13/21] ACPICA: Add new MADT GICC flags fields

On Mon, Dec 18, 2023 at 10:23 AM Lorenzo Pieralisi
<lpieralisi@...nel.org> wrote:
>
> On Fri, Dec 15, 2023 at 04:53:28PM +0000, Russell King (Oracle) wrote:
> > On Fri, Dec 15, 2023 at 04:23:22PM +0000, Jonathan Cameron wrote:
> > > On Wed, 13 Dec 2023 12:50:18 +0000
> > > Russell King (Oracle) <rmk+kernel@...linux.org.uk> wrote:
> > >
> > > > From: James Morse <james.morse@....com>
> > > >
> > > > Add the new flag field to the MADT's GICC structure.
> > > >
> > > > 'Online Capable' indicates a disabled CPU can be enabled later. See
> > > > ACPI specification 6.5 Tabel 5.37: GICC CPU Interface Flags.
> > > >
> > > > Signed-off-by: James Morse <james.morse@....com>
> > > > Tested-by: Miguel Luis <miguel.luis@...cle.com>
> > > > Tested-by: Vishnu Pajjuri <vishnu@...amperecomputing.com>
> > > > Tested-by: Jianyong Wu <jianyong.wu@....com>
> > > > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > >
> > > I see there is an acpica pull request including this bit but with a different name
> > > For reference.
> > > https://github.com/acpica/acpica/pull/914/commits/453a5f67567786522021d5f6913f561f8b3cabf6
> > >
> > > +CC Lorenzo who submitted that.
> >
> > > > +#define ACPI_MADT_GICC_CPU_CAPABLE      (1<<3)   /* 03: CPU is online capable */
> > >
> > > ACPI_MADT_GICC_ONLINE_CAPABLE
> >
> > It's somewhat disappointing, but no big deal. It's easy enough to change
> > "irqchip/gic-v3: Add support for ACPI's disabled but 'online capable' CPUs"
> > to use Lorenzo's name when that patch hits - and it becomes one less
> > patch in this patch set when Lorenzo's change eventually hits mainline.
> >
> > Does anyone know how long it may take for Lorenzo's change to get into
> > mainline? Would it be by the 6.8 merge window or the following one?
>
> I wish I knew. I submitted ACPICA changes for the online capable bit
> since I had to add additional flags on top (ie DMA coherent) and it
> would not make sense to submit the latter without the former.
>
> I'd be great if the ACPICA headers can make it into Linux for the upcoming
> merge window, not sure what I can do to fasttrack the process though
> (I shall ping the maintainers).

If your upstream pull request has been merged, I can pick up Linux
patches carrying Link: tags pointing to the upstream ACPICA commits in
that pull request.

Thanks!