linux-kernel - Re: [PATCH] ath10k: Wait until copy complete is actually done before completing

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Message-Id: <20200615143237.519F3C433C8@smtp.codeaurora.org>
Date:   Mon, 15 Jun 2020 14:32:37 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     kuabhs@...gle.com, pillair@...eaurora.org,
        saiprakash.ranjan@...eaurora.org, linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, ath10k@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] ath10k: Wait until copy complete is actually done before
 completing

Douglas Anderson <dianders@...omium.org> wrote:

> On wcn3990 we have "per_ce_irq = true".  That makes the
> ath10k_ce_interrupt_summary() function always return 0xfff. The
> ath10k_ce_per_engine_service_any() function will see this and think
> that _all_ copy engines have an interrupt.  Without checking, the
> ath10k_ce_per_engine_service() assumes that if it's called that the
> "copy complete" (cc) interrupt fired.  This combination seems bad.
> 
> Let's add a check to make sure that the "copy complete" interrupt
> actually fired in ath10k_ce_per_engine_service().
> 
> This might fix a hard-to-reproduce failure where it appears that the
> copy complete handlers run before the copy is really complete.
> Specifically a symptom was that we were seeing this on a Qualcomm
> sc7180 board:
>   arm-smmu 15000000.iommu: Unhandled context fault:
>   fsr=0x402, iova=0x7fdd45780, fsynr=0x30003, cbfrsynra=0xc1, cb=10
> 
> Even on platforms that don't have wcn3990 this still seems like it
> would be a sane thing to do.  Specifically the current IRQ handler
> comments indicate that there might be other misc interrupt sources
> firing that need to be cleared.  If one of those sources was the one
> that caused the IRQ handler to be called it would also be important to
> double-check that the interrupt we cared about actually fired.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

ath10k firmwares work very differently, on what hardware and firmware did you
test this? I'll add that information to the commit log.

-- 
https://patchwork.kernel.org/patch/11595887/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches