From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5CA2CC433F5 for ; Tue, 30 Nov 2021 07:51:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:CC:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AsU7UHL2kEjBXQvkPsps4MiVTmzyoR+HUlQtHKIZobo=; b=cJNbGlKMZyLw9p jjhByJK+L2tzjDCWst5Mhzl2IYmUnTpE7azremN3s0gJz3P40nRe9aNun6PV+c631FcLFobDg/WUW 2MOXiTuGdH3VXnp26y7nfRTbWWPsSuu0EbFi2vA2TY8levTGCP0gZEhdXIWbWHLHsI9S6U861JlG3 ZbzYu/O5d49ZtcfgoyxkP0Ck5yEmQn+971+TOmP9N3w52sEI9a/lCVkCVBsQpRdYeE+FC9oeYMLC8 +0lD+BNVHdGz2/r0/JO9FFYjHRabmH6N/xdZliF8+nVA2qUSzUeH2uqIDIfu8l8z0W+u6DSHNCS0E t2FwOTs4MGblamgNtAyA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mrxtV-003yIC-Q8; Tue, 30 Nov 2021 07:49:41 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mrxtR-003yGs-3p; Tue, 30 Nov 2021 07:49:39 +0000 X-UUID: e34c31656a6048928e06efe73e55efdd-20211130 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:MIME-Version:Content-Type:References:In-Reply-To:Date:CC:To:From:Subject:Message-ID; bh=v5F5DipMsGe/EhJ3XkNJOo99cD9se6MaFiuPADUCFXA=; b=Wt0hcqgHxMtmKtTWDC2cPfglu7dEFhsII8AagJ29qZOhveaGYWXKlBS50jY4XivSzjgOjdKLpFEorUIoFuSAYYrQ4dC5tSTwukPQ0LPlr5HNaJ4pU4Xly7DGwH/5tVIrF9Z0hzlNXBMbkeIupebrYdzB0JXiVe6VOkJbktMb5JM=; X-UUID: e34c31656a6048928e06efe73e55efdd-20211130 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1584853144; Tue, 30 Nov 2021 00:49:33 -0700 Received: from mtkmbs10n1.mediatek.inc (172.21.101.34) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 29 Nov 2021 23:39:31 -0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Tue, 30 Nov 2021 15:39:29 +0800 Received: from mhfsdcap04 (10.17.3.154) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 30 Nov 2021 15:39:28 +0800 Message-ID: <128eb1874127b2b9b42a7419e26090d1d192666f.camel@mediatek.com> Subject: Re: [PATCH v3 12/33] iommu/mediatek: Always tlb_flush_all when each PM resume From: Yong Wu To: Dafna Hirschfeld CC: Krzysztof Kozlowski , Tomasz Figa , , , , , Hsin-Yi Wang , , , , AngeloGioacchino Del Regno , Fabien Parent , , "Collabora Kernel ML" , Joerg Roedel , Rob Herring , Matthias Brugger , "Will Deacon" , Robin Murphy , , Date: Tue, 30 Nov 2021 15:39:27 +0800 In-Reply-To: References: <20210923115840.17813-1-yong.wu@mediatek.com> <20210923115840.17813-13-yong.wu@mediatek.com> <5c4dd67ae7c81721d8cfd2c3b23b7c6df493cb5a.camel@mediatek.com> <4dd4cf8d-0f52-afae-f7d9-8e3cfdf3b729@collabora.com> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211129_234937_201125_C8D41184 X-CRM114-Status: GOOD ( 43.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 2021-11-27 at 12:11 +0200, Dafna Hirschfeld wrote: > > On 10.11.21 09:50, Yong Wu wrote: > > On Wed, 2021-11-10 at 07:29 +0200, Dafna Hirschfeld wrote: > > > > > > On 10.11.21 04:20, Yong Wu wrote: > > > > On Tue, 2021-11-09 at 14:21 +0200, Dafna Hirschfeld wrote: > > > > > Hi > > > > > This patch is needed in order to update the tlb when a device > > > > > is > > > > > powered on. > > > > > Could you send this patch alone without the whole series so > > > > > it > > > > > get > > > > > accepted easier? > > > > > > > > Which SoC are you testing on? In previous SoC, the IOMMU HW > > > > don't > > > > have > > > > power-domain, and we have a "has_pm"[1] in the tlb function for > > > > that > > > > case. The "has_pm" should be always 0 for the previous SoC like > > > > mt8173, > > > > it should always tlb synchronize. > > > > > > > > thus, Could you help share more about your issue? In which case > > > > it > > > > lack > > > > the necessary tlb operation. At least, We need confirm if it > > > > needs > > > > a > > > > "Fixes" tags if sending this patch alone. > > > > > > Hi, > > > I work with the mtk-vcodec driver on mt8173. As you wrote, the > > > iommu > > > doesn't > > > have a power-domain and so when allocating buffers before the > > > device > > > is powered > > > on, there is the warning > > > "Partial TLB flush timed out, falling back to full flush" > > > flooding the log buf. > > > > oh. Thanks very much for your information. Get it now. > > > > This issue should be introduced by the: > > > > b34ea31fe013 ("iommu/mediatek: Always enable the clk on resume") > > Hi, reverting this commit didn't solve those warnings, > I think this is because in the function mtk_iommu_attach_device > the first call to pm_runtime_resume_and_get does not turn the clks on > since m4u_dom is not yet initialize. And then mtk_iommu_attach_device > calls pm_runtime_put right after mtk_iommu_hw_init is called > (where the clks are turned on) oh. Right. this is also related with the patch of "Add power-domain operation". The current problem is that there is a redundant log of "Partial TLB flush timed out" in mt8173. We need fix this issue firstly. Are you going to prepare the patches again? If not, I could help this. You could help confirm them if you are free. Thanks. > > thanks, > Dafna > > > > > > tlb failed due to the bclk is not enabled. Could you help try that > > after reverting this? > > > > > > > > Sebastian Reichel suggested to remove the 'if(has_pm)' check to > > > avoid > > > this warning, > > > and avoid flushing the tlb if the device is off: > > > > > > [1] http://ix.io/3Eyr > > > > > > This fixes the warning, but then the tlb is not flushed in sync, > > > Therefore the tlb should be flushed when the device is resumed. > > > > > > So the two patches (the one suggested in the link [1] and this > > > patch) > > > should be sent together as a 2-patch series. > > > > then this is reasonable. You could help this into a new patchset if > > you > > are free(add Fixes tag). > > > > Thanks. > > > > > > > > Thanks, > > > Dafna > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel