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

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Date:   Tue, 25 Apr 2017 02:40:57 -0400
From:   Jon Masters <jcm@...masters.org>
To:     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>
Subject: Re: [PATCH v4 00/21] PCI: fix config space memory mappings

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.