linux-kernel - Re: [PATCH v4 00/21] PCI: fix config space memory mappings

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Date:   Tue, 25 Apr 2017 11:31:44 -0700
From:   Khuong Dinh <kdinh@....com>
To:     Jingoo Han <jingoohan1@...il.com>
Cc:     Jon Masters <jcm@...masters.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Pratyush Anand <pratyush.anand@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will.deacon@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mingkai Hu <mingkai.hu@...escale.com>,
        Tanmay Inamdar <tinamdar@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Russell King <linux@...linux.org.uk>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
        Ray Jui <rjui@...adcom.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Minghuan Lian <minghuan.Lian@...escale.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jon Mason <jonmason@...adcom.com>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Thierry Reding <thierry.reding@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Roy Zang <tie-fei.zang@...escale.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH v4 00/21] PCI: fix config space memory mappings

Ack.
Tested-by: Khuong Dinh <kdinh@....com>


On Tue, Apr 25, 2017 at 9:20 AM, Jingoo Han <jingoohan1@...il.com> wrote:
> On Tuesday, April 25, 2017 2:41 AM, Jon Masters wrote:
>>
>> On 04/19/2017 12:48 PM, Lorenzo Pieralisi wrote:
>>
>> > On some platforms (ie ARM/ARM64) ioremap fails to comply with the PCI
>> > configuration non-posted write transactions requirement, because it
>> > provides a memory mapping that issues "bufferable" or, in PCI terms
>> > "posted" write transactions. Likewise, the current pci_remap_iospace()
>> > implementation maps the physical address range that the PCI translates
>> > to I/O space cycles to virtual address space through pgprot_device()
>> > attributes that on eg ARM64 provides a memory mapping issuing
>> > posted writes transactions, which is not PCI specifications compliant.
>>
>> Side note that I've pinged all of the ARM server vendors and asked them
>> to verify this patch series on their platforms.
>
> Good! I really want to know the result of these patches on ARM serves.
> Please share it with us. Good luck.
>
> Best regards,
> Jingoo Han
>
>>
>> Jon.
>
>

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