linux-kernel - Re: [PATCH v17 08/10] ACPI / scan: do not enumerate Indirect IO host children

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Date:   Mon, 19 Mar 2018 10:48:34 +0000
From:   John Garry <john.garry@...wei.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
CC:     <mika.westerberg@...ux.intel.com>, <rafael@...nel.org>,
        <lorenzo.pieralisi@....com>, <hanjun.guo@...aro.org>,
        <robh+dt@...nel.org>, <bhelgaas@...gle.com>, <arnd@...db.de>,
        <mark.rutland@....com>, <olof@...om.net>,
        <dann.frazier@...onical.com>, <andy.shevchenko@...il.com>,
        <robh@...nel.org>, <andriy.shevchenko@...ux.intel.com>,
        <joe@...ches.com>, <benh@...nel.crashing.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <linuxarm@...wei.com>,
        <minyard@....org>, <devicetree@...r.kernel.org>,
        <linux-arch@...r.kernel.org>, <rdunlap@...radead.org>,
        <gregkh@...uxfoundation.org>, <akpm@...ux-foundation.org>,
        <frowand.list@...il.com>, <agraf@...e.de>
Subject: Re: [PATCH v17 08/10] ACPI / scan: do not enumerate Indirect IO host
 children

On 19/03/2018 10:30, Rafael J. Wysocki wrote:
> On Wednesday, March 14, 2018 7:15:57 PM CET John Garry wrote:
>> > Through the logical PIO framework systems which otherwise have
>> > no IO space access to legacy ISA/LPC devices may access these
>> > devices through so-called "indirect IO" method. In this, IO
>> > space accesses for non-PCI hosts are redirected to a host
>> > LLDD to manually generate the IO space (bus) accesses. Hosts
>> > are able to register a region in logical PIO space to map to
>> > its bus address range.
>> >
>> > Indirect IO child devices have an associated host-specific bus
>> > address. Special translation is required to map between
>> > a logical PIO address for a device and it's host bus address.
>> >
>> > Since in the ACPI tables the child device IO resources would
>> > be the host-specific values, it is required the ACPI scan code
>> > should not enumerate these devices, and that this should be
>> > the responsibility of the host driver so that it can "fixup"
>> > the resources so that they map to the appropriate logical PIO
>> > addresses.
>> >
>> > To avoid enumerating these child devices, we add a check from
>> > acpi_device_enumeration_by_parent() as to whether the parent
>> > for a device is a member of a known list of "indirect IO" hosts.
>> > For now, the HiSilicon LPC host controller ID is added.
>> >
>> > Signed-off-by: John Garry <john.garry@...wei.com>
>> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> You have my ACK here already.
>
> Since I've ACKed the [7/10] too, I don't think there's anything more I can do
> about this series and I'm assuming that it will be routed through other trees.
>
> Thanks!
>

Hi Rafael,

Thanks for this.

Yes, I am working on getting this whole series routed through another 
tree. Actually I think 7+8 could go separately since there is no build 
dependency, but I will try to keep the series together.

All the best, And thanks again,
John