linux-kernel - Re: [UPDATE PATCH V11 1/8] ACPI: I/O Remapping Table (IORT) initial support

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Message-ID: <20160912203607.591773e6@why.wild-wind.fr.eu.org>
Date:   Mon, 12 Sep 2016 20:36:07 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Tomasz Nowicki <tn@...ihalf.com>
Cc:     tglx@...utronix.de, jason@...edaemon.net, rjw@...ysocki.net,
        helgaas@...nel.org, rafael@...nel.org, Lorenzo.Pieralisi@....com,
        will.deacon@....com, catalin.marinas@....com,
        hanjun.guo@...aro.org, shijie.huang@....com,
        robert.richter@...iumnetworks.com, mw@...ihalf.com,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linaro-acpi@...ts.linaro.org, andrea.gallo@...aro.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        al.stone@...aro.org, graeme.gregory@...aro.org,
        ddaney.cavm@...il.com, okaya@...eaurora.org
Subject: Re: [UPDATE PATCH V11 1/8] ACPI: I/O Remapping Table (IORT) initial
 support

On Mon, 12 Sep 2016 20:58:42 +0200
Tomasz Nowicki <tn@...ihalf.com> wrote:

> On 12.09.2016 20:54, Tomasz Nowicki wrote:
> > IORT shows representation of IO topology for ARM based systems.
> > It describes how various components are connected together on
> > parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec.
> > http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf
> >
> > Initial support allows to detect IORT table presence and save its
> > root pointer obtained through acpi_get_table(). The pointer validity
> > depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap
> > is not set while using IORT nodes we would dereference unmapped pointers.
> >
> > For the aforementioned reason call acpi_iort_init() from acpi_init()
> > which guarantees acpi_gbl_permanent_mmap to be set at that point.
> >
> > Add generic helpers which are helpful for scanning and retrieving
> > information from IORT table content. List of the most important helpers:
> > - iort_find_dev_node() finds IORT node for a given device
> > - iort_node_map_rid() maps device RID and returns IORT node which provides
> >   final translation
> >
> > IORT support is placed under drivers/acpi/arm64/ new directory due to its
> > ARM64 specific nature. The code there is considered only for ARM64.
> > The long term plan is to keep all ARM64 specific tables support
> > in this place e.g. GTDT table.
> >
> > Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> > Acked-by: Rafael J. Wysocki <rjw@...ysocki.net>
> > Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>
> > Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>  
> 
> Hi Marc,
> 
> Series with updated patch 1 can be found:
> https://github.com/semihalf-nowicki-tomasz/linux.git (its-acpi-v11)
> 
> Sorry for zillions of patch updates...

I've swapped the two patches and pushed the result out again, but from
now on, please send updates on top of irq/irqchip-4.9.

Thanks,

	M.
-- 
Without deviation from the norm, progress is not possible.