netdev - Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Date:   Tue, 23 Jul 2019 13:09:00 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Robin Murphy <robin.murphy@....com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Lars Persson <lists@...h.nu>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "David S . Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool


On 23/07/2019 11:29, Robin Murphy wrote:
> On 23/07/2019 11:07, Jose Abreu wrote:
>> From: Jon Hunter <jonathanh@...dia.com>
>> Date: Jul/23/2019, 11:01:24 (UTC+00:00)
>>
>>> This appears to be a winner and by disabling the SMMU for the ethernet
>>> controller and reverting commit 954a03be033c7cef80ddc232e7cbdb17df735663
>>> this worked! So yes appears to be related to the SMMU being enabled. We
>>> had to enable the SMMU for ethernet recently due to commit
>>> 954a03be033c7cef80ddc232e7cbdb17df735663.
>>
>> Finally :)
>>
>> However, from "git show 954a03be033c7cef80ddc232e7cbdb17df735663":
>>
>> +         There are few reasons to allow unmatched stream bypass, and
>> +         even fewer good ones.  If saying YES here breaks your board
>> +         you should work on fixing your board.
>>
>> So, how can we fix this ? Is your ethernet DT node marked as
>> "dma-coherent;" ?
> 
> The first thing to try would be booting the failing setup with
> "iommu.passthrough=1" (or using CONFIG_IOMMU_DEFAULT_PASSTHROUGH) - if
> that makes things seem OK, then the problem is likely related to address
> translation; if not, then it's probably time to start looking at nasties
> like coherency and ordering, although in principle I wouldn't expect the
> SMMU to have too much impact there.

Setting "iommu.passthrough=1" works for me. However, I am not sure where
to go from here, so any ideas you have would be great.

> Do you know if the SMMU interrupts are working correctly? If not, it's
> possible that an incorrect address or mapping direction could lead to
> the DMA transaction just being silently terminated without any fault
> indication, which generally presents as inexplicable weirdness (I've
> certainly seen that on another platform with the mix of an unsupported
> interrupt controller and an 'imperfect' ethernet driver).

If I simply remove the iommu node for the ethernet controller, then I
see lots of ...

[    6.296121] arm-smmu 12000000.iommu: Unexpected global fault, this could be serious
[    6.296125] arm-smmu 12000000.iommu:         GFSR 0x00000002, GFSYNR0 0x00000000, GFSYNR1 0x00000014, GFSYNR2 0x00000000

So I assume that this is triggering the SMMU interrupt correctly. 

> Just to confirm, has the original patch been tested with
> CONFIG_DMA_API_DEBUG to rule out any high-level mishaps?
Yes one of the first things we tried but did not bare any fruit.

Cheers
Jon

-- 
nvpublic