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

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Date:   Wed, 26 Apr 2017 18:53:30 +0800
From:   Dongdong Liu <liudongdong3@...wei.com>
To:     Jon Masters <jcm@...masters.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        <linux-pci@...r.kernel.org>
CC:     <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>,
        "Jingoo Han" <jingoohan1@...il.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>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH v4 00/21] PCI: fix config space memory mappings


Tested-by: Dongdong Liu <liudongdong3@...wei.com>

I tested the patchset on HiSilicon ARM64 D05 board.It works ok with 82599 netcard.

Thanks,
Dongdong
在 2017/4/25 14:40, Jon Masters 写道:
> 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.
>
> Jon.
>
> .
>