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Tue, 31 Mar 2020 07:36:12 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id A55A4C43636; Tue, 31 Mar 2020 07:36:12 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 0830EC433F2; Tue, 31 Mar 2020 07:36:11 +0000 (UTC) MIME-Version: 1.0 Date: Tue, 31 Mar 2020 13:06:11 +0530 From: Sai Prakash Ranjan To: Doug Anderson Subject: Re: [PATCH] iommu/arm-smmu: Demote error messages to debug in shutdown callback In-Reply-To: References: <20200327132852.10352-1-saiprakash.ranjan@codeaurora.org> <0023bc68-45fb-4e80-00c8-01fd0369243f@arm.com> <37db9a4d524aa4d7529ae47a8065c9e0@codeaurora.org> <5858bdac-b7f9-ac26-0c0d-c9653cef841d@arm.com> Message-ID: <890456524e2df548ba5d44752513a62c@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Cc: Robin Murphy , LKML , "list@263.net:IOMMU DRIVERS , Joerg Roedel , " , linux-arm-msm , Will Deacon X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi, On 2020-03-30 23:54, Doug Anderson wrote: > Hi, > > On Sat, Mar 28, 2020 at 12:35 AM Sai Prakash Ranjan > wrote: >> >> > Of course the fact that in practice we'll *always* see the warning >> > because there's no way to tear down the default DMA domains, and even >> > if all devices *have* been nicely quiesced there's no way to tell, is >> > certainly less than ideal. Like I say, it's not entirely clear-cut >> > either way... >> > >> >> Thanks for these examples, good to know these scenarios in case we >> come >> across these. >> However, if we see these error/warning messages appear everytime then >> what will be >> the credibility of these messages? We will just ignore these messages >> when >> these issues you mention actually appears because we see them >> everytime >> on >> reboot or shutdown. > > I would agree that if these messages are expected to be seen every > time, there's no way to fix them, and they're not indicative of any > problem then something should be done. Seeing something printed at > "dev_error" level with an exclamation point (!) at the end makes me > feel like this is something that needs immediate action on my part. > > If we really can't do better but feel that the messages need to be > there, at least make them dev_info and less scary like: > > arm-smmu 15000000.iommu: turning off; DMA should be quiesced before > now > > ...that would still give you a hint in the logs that if you saw a DMA > transaction after the message that it was a bug but also wouldn't > sound scary to someone who wasn't seeing any other problems. > We can do this if Robin is OK? -Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu