linux-kernel - Re: [PATCH 00/11] of: dma-ranges fixes and improvements

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Date:   Mon, 30 Sep 2019 14:54:56 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     Robin Murphy <robin.murphy@....com>, Rob Herring <robh@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stefan Wahren <wahrenst@....net>,
        Frank Rowand <frowand.list@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Oza Pawandeep <oza.oza@...adcom.com>
Subject: Re: [PATCH 00/11] of: dma-ranges fixes and improvements

On 9/30/19 2:52 PM, Robin Murphy wrote:
> On 30/09/2019 13:40, Marek Vasut wrote:
>> On 9/27/19 2:24 AM, Rob Herring wrote:
>>> This series fixes several issues related to 'dma-ranges'. Primarily,
>>> 'dma-ranges' in a PCI bridge node does correctly set dma masks for PCI
>>> devices not described in the DT. A common case needing dma-ranges is a
>>> 32-bit PCIe bridge on a 64-bit system. This affects several platforms
>>> including Broadcom, NXP, Renesas, and Arm Juno. There's been several
>>> attempts to fix these issues, most recently earlier this week[1].
>>>
>>> In the process, I found several bugs in the address translation. It
>>> appears that things have happened to work as various DTs happen to use
>>> 1:1 addresses.
>>>
>>> First 3 patches are just some clean-up. The 4th patch adds a unittest
>>> exhibiting the issues. Patches 5-9 rework how of_dma_configure() works
>>> making it work on either a struct device child node or a struct
>>> device_node parent node so that it works on bus leaf nodes like PCI
>>> bridges. Patches 10 and 11 fix 2 issues with address translation for
>>> dma-ranges.
>>>
>>> My testing on this has been with QEMU virt machine hacked up to set PCI
>>> dma-ranges and the unittest. Nicolas reports this series resolves the
>>> issues on Rpi4 and NXP Layerscape platforms.
>>
>> With the following patches applied:
>>        https://patchwork.ozlabs.org/patch/1144870/
>>        https://patchwork.ozlabs.org/patch/1144871/
> 
> Can you try it without those additional patches? This series aims to
> make the parsing work properly generically, such that we shouldn't need
> to add an additional PCI-specific version of almost the same code.

Seems to work even without those.

-- 
Best regards,
Marek Vasut