Subject: Re: [PATCH v4 00/21] PCI: fix config space memory mappings
To: Jon Masters <jcm@jonmasters.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        <linux-pci@vger.kernel.org>
References: <20170419164913.19674-1-lorenzo.pieralisi@arm.com>
 <2e24e205-d761-9172-9463-4a53e1a0de4d@jonmasters.org>
CC: <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
        Pratyush Anand <pratyush.anand@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>,
        Will Deacon <will.deacon@arm.com>, "Jingoo Han" <jingoohan1@gmail.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Mingkai Hu <mingkai.hu@freescale.com>,
        Tanmay Inamdar <tinamdar@apm.com>,
        "Murali Karicheri" <m-karicheri2@ti.com>,
        Russell King <linux@armlinux.org.uk>,
        "Bharat Kumar Gogada" <bharat.kumar.gogada@xilinx.com>,
        Ray Jui <rjui@broadcom.com>, Wenrui Li <wenrui.li@rock-chips.com>,
        Shawn Lin <shawn.lin@rock-chips.com>,
        Minghuan Lian <minghuan.Lian@freescale.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Jon Mason <jonmason@broadcom.com>,
        "Gabriele Paoloni" <gabriele.paoloni@huawei.com>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        Joao Pinto <Joao.Pinto@synopsys.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        "Luis R . Rodriguez" <mcgrof@kernel.org>,
        Michal Simek <michal.simek@xilinx.com>,
        "Stanimir Varbanov" <svarbanov@mm-sol.com>,
        Zhou Wang <wangzhou1@hisilicon.com>,
        "Roy Zang" <tie-fei.zang@freescale.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        John Garry <john.garry@huawei.com>, Linuxarm <linuxarm@huawei.com>
From: Dongdong Liu <liudongdong3@huawei.com>
Message-ID: <361fde15-5ba3-d33b-f946-003e89ba071f@huawei.com>
Date: Wed, 26 Apr 2017 18:53:30 +0800
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Tested-by: Dongdong Liu <liudongdong3@huawei.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.
>
> .
>