linux-kernel - Re: [PATCH v5 04/12] PCI: brcmstb: add dma-range mapping for inbound traffic

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Date:   Thu, 27 Jun 2019 18:55:25 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     ard.biesheuvel@...aro.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Brian Norris <computersforpeace@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 04/12] PCI: brcmstb: add dma-range mapping for inbound
 traffic

Hi Jim,

Am 24.09.18 um 17:01 schrieb Jim Quinlan:
> On Mon, Sep 24, 2018 at 4:25 AM Ard Biesheuvel
> <ard.biesheuvel@...aro.org> wrote:
>> On Fri, 21 Sep 2018 at 19:41, Jim Quinlan <jim2101024@...il.com> wrote:
>>> On Thu, Sep 20, 2018 at 5:39 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>>>> On 09/20/2018 02:33 PM, Ard Biesheuvel wrote:
>>>>> On 20 September 2018 at 14:31, Florian Fainelli <f.fainelli@...il.com> wrote:
>>>>>> On 09/20/2018 02:04 PM, Ard Biesheuvel wrote:
>>>>>>> On 20 September 2018 at 13:55, Florian Fainelli <f.fainelli@...il.com> wrote:
>>>>>>>> On 09/19/2018 07:19 PM, Ard Biesheuvel wrote:
>>>>>>>>> On 19 September 2018 at 07:31, Jim Quinlan <jim2101024@...il.com> wrote:
>>>>>>>>>> The Broadcom STB PCIe host controller is intimately related to the
>>>>>>>>>> memory subsystem.  This close relationship adds complexity to how cpu
>>>>>>>>>> system memory is mapped to PCIe memory.  Ideally, this mapping is an
>>>>>>>>>> identity mapping, or an identity mapping off by a constant.  Not so in
>>>>>>>>>> this case.

are there any plans to release a new version of this series?

The Raspberry Pi 4 uses a similiar PCIe controller, so it would be nice
to get this upstream. Unfortunately i have no clue about PCI, so i the
only thing i can do is testing.

Regards
Stefan