linux-kernel - Re: [PATCH v13 1/9] LIB: Introduce a generic PIO mapping method

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Message-ID: <b16db30e-67d3-0469-d8c7-029665702378@huawei.com>
Date:   Wed, 14 Feb 2018 16:13:57 +0000
From:   John Garry <john.garry@...wei.com>
To:     dann frazier <dann.frazier@...onical.com>
CC:     <mika.westerberg@...ux.intel.com>, <rafael@...nel.org>,
        <lorenzo.pieralisi@....com>, <rjw@...ysocki.net>,
        <hanjun.guo@...aro.org>, <robh+dt@...nel.org>,
        <bhelgaas@...gle.com>, <arnd@...db.de>, <mark.rutland@....com>,
        <olof@...om.net>, <andy.shevchenko@...il.com>, <robh@...nel.org>,
        <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>
Subject: Re: [PATCH v13 1/9] LIB: Introduce a generic PIO mapping method

On 13/02/2018 23:05, dann frazier wrote:
>>  	bool
>> >
>> > +config INDIRECT_PIO
>> > +	bool "Access I/O in non-MMIO mode"
>> > +	depends on ARM64
>> > +	help
>> > +	  On some platforms where no separate I/O space exists, there are I/O
>> > +	  hosts which can not be accessed in MMIO mode. Using the logical PIO
>> > +	  mechanism, the host-local I/O resource can be mapped into system
>> > +	  logic PIO space shared with MMIO hosts, such as PCI/PCIE, then the
>> > +	  system can access the I/O devices with the mapped logic PIO through
>> > +	  I/O accessors.
>> > +	  This way has a relatively little I/O performance cost. Please make
> grammar nit - s/a relatively/relatively/
>

Fine, thanks

John

>   -dann
>
>> > +	  sure your devices really need this configure item enabled.
>> > +