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From: Kalle Valo <kvalo@codeaurora.org>
To: Douglas Anderson <dianders@chromium.org>
Cc: saiprakash.ranjan@codeaurora.org, linux-arm-msm@vger.kernel.org,
	briannorris@chromium.org, linux-wireless@vger.kernel.org,
	ath10k@lists.infradead.org, linux-kernel@vger.kernel.org,
	pillair@codeaurora.org, netdev@vger.kernel.org,
	Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	kuabhs@google.com
Subject: Re: [PATCH v2 1/2] ath10k: Keep track of which interrupts fired, don't poll them
Date: Tue,  1 Sep 2020 12:06:04 +0000 (UTC)	[thread overview]
Message-ID: <20200901120604.E0340C433C9@smtp.codeaurora.org> (raw)
In-Reply-To: <20200709082024.v2.1.I4d2f85ffa06f38532631e864a3125691ef5ffe06@changeid>

Douglas Anderson <dianders@chromium.org> wrote:

> If we have a per CE (Copy Engine) IRQ then we have no summary
> register.  Right now the code generates a summary register by
> iterating over all copy engines and seeing if they have an interrupt
> pending.
> 
> This has a problem.  Specifically if _none_ if the Copy Engines have
> an interrupt pending then they might go into low power mode and
> reading from their address space will cause a full system crash.  This
> was seen to happen when two interrupts went off at nearly the same
> time.  Both were handled by a single call of ath10k_snoc_napi_poll()
> but, because there were two interrupts handled and thus two calls to
> napi_schedule() there was still a second call to
> ath10k_snoc_napi_poll() which ran with no interrupts pending.
> 
> Instead of iterating over all the copy engines, let's just keep track
> of the IRQs that fire.  Then we can effectively generate our own
> summary without ever needing to read the Copy Engines.
> 
> Tested-on: WCN3990 SNOC WLAN.HL.3.2.2-00490-QCAHLSWMTPL-1
> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Rakesh Pillai <pillair@codeaurora.org>
> Reviewed-by: Brian Norris <briannorris@chromium.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

2 patches applied to ath-next branch of ath.git, thanks.

d66d24ac300c ath10k: Keep track of which interrupts fired, don't poll them
7f8655166512 ath10k: Get rid of "per_ce_irq" hw param

-- 
https://patchwork.kernel.org/patch/11654625/

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


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  parent reply	other threads:[~2020-09-01 12:06 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-09 15:21 [PATCH v2 1/2] ath10k: Keep track of which interrupts fired, don't poll them Douglas Anderson
2020-07-09 15:21 ` Douglas Anderson
2020-07-09 15:21 ` [PATCH v2 2/2] ath10k: Get rid of "per_ce_irq" hw param Douglas Anderson
2020-07-09 15:21   ` Douglas Anderson
2020-08-21 21:25 ` [PATCH v2 1/2] ath10k: Keep track of which interrupts fired, don't poll them Doug Anderson
2020-08-21 21:25   ` Doug Anderson
2020-08-24  8:36 ` Marc Gonzalez
2020-08-24  8:36   ` Marc Gonzalez
2020-08-26 14:50 ` Kalle Valo
2020-08-26 14:59   ` Doug Anderson
2020-08-26 14:59     ` Doug Anderson
2020-09-01 12:14     ` Kalle Valo
2020-09-01 12:14       ` Kalle Valo
2020-08-26 14:50 ` Kalle Valo
2020-09-01 12:06 ` Kalle Valo [this message]
2020-09-01 12:06 ` Kalle Valo

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