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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1632DC2BB3F for ; Sat, 18 Nov 2023 11:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229602AbjKRLVV (ORCPT ); Sat, 18 Nov 2023 06:21:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35488 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229469AbjKRLVT (ORCPT ); Sat, 18 Nov 2023 06:21:19 -0500 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79297D6C for ; Sat, 18 Nov 2023 03:21:15 -0800 (PST) Received: by mail-wr1-x443.google.com with SMTP id ffacd0b85a97d-32f8441dfb5so2091309f8f.0 for ; Sat, 18 Nov 2023 03:21:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1700306474; x=1700911274; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=mPUyKTXXSta6O2fovS/Sd+lPKUPKukl6VDR0zfaqpOc=; b=EqcpG5e3AgyxxGbrAqhoABqyQQf23sBgO6d/56Jdbai2pAc/mD3+olAcmhtlF2jt7l 0xg8TVOuqVsNLnXTeU9EyLRkaTfbb3TgqlX42ft30zomvUxmTEDtMXpK6VzYMNZpP8dy OVGsV9v7bO2zO7yZ5Um4UHv9CZmLDzCQVJB1WCPYZ/kw/e9rTU83yfIyo/pcu3o4Auyp 8fmQoSLoyZfAZlHzHfG7zXHW0o0F1iH/N/8nPLoCZWexutXwGhAFdx/yEN346Ph05ZQ+ 9SsqV6B1KShUBMAX2mwFzpmpTlg5sctMNI+E/QUIVj7Lf+r+Ky+7ZzLoS/NnYqsLJMEG bjow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700306474; x=1700911274; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mPUyKTXXSta6O2fovS/Sd+lPKUPKukl6VDR0zfaqpOc=; b=q55RL7p7qWjkAsz8WiKGIF5GJ5kib9gVqItYJW4i6p/y7pCDHAPZeo2jFzUOffB7Q3 fI+oN+GNZ1SpQka1/lR9nB9HZdgHYYCkp5EXNUFMZ7+J7NpLz+Qo3aK6Jn4EhehueSqS V4980G8RKWyZOeutgrFK4H7YYWoiWflnbtr8Q/hfbD78HkplrUxP+ywZV8e+/wfxG9ag YYHS9Kj1+Q5QPSiH4VEnQ+kqisOkarK1TxlHYcgR6PoxDo26FT+UUKiw9pnSMpj5stri QHPRIvNcc1IsYqqRU8/WcYeT3OfkYYPJBQ7ev3oz2WFA7Jy/QqGKnyRiKFCeT6qmI51T 3lqQ== X-Gm-Message-State: AOJu0YwmMIFSaXcfJfaWR2TEUI2/oZiecHlyycnwLRC3USUpOH3Wu95e dFWbUa+Lkb3pdG4oe7rl3oeQIw== X-Google-Smtp-Source: AGHT+IGlRDKm9rqnOd1dR8K6pxIjfQMraB1ziQN/o0o+0J4lvPN9D0qU3XUhj/DS3Uy0+DQDIsEarA== X-Received: by 2002:a5d:64ee:0:b0:32d:aa56:c0c7 with SMTP id g14-20020a5d64ee000000b0032daa56c0c7mr1242475wri.54.1700306473449; Sat, 18 Nov 2023 03:21:13 -0800 (PST) Received: from [192.168.100.102] ([37.228.218.3]) by smtp.gmail.com with ESMTPSA id p6-20020a5d68c6000000b0032fdcbfb093sm5109586wrw.81.2023.11.18.03.21.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 18 Nov 2023 03:21:12 -0800 (PST) Message-ID: Date: Sat, 18 Nov 2023 11:21:11 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/6] Add support for Translation Buffer Units Content-Language: en-US To: Georgi Djakov , robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, will@kernel.org, robin.murphy@arm.com, joro@8bytes.org Cc: devicetree@vger.kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, quic_cgoldswo@quicinc.com, quic_sukadev@quicinc.com, quic_pdaly@quicinc.com, quic_sudaraja@quicinc.com, djakov@kernel.org References: <20231118042730.2799-1-quic_c_gdjako@quicinc.com> From: Bryan O'Donoghue In-Reply-To: <20231118042730.2799-1-quic_c_gdjako@quicinc.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/11/2023 04:27, Georgi Djakov wrote: > The TCUs (Translation Control Units) and TBUs (Translation Buffer > Units) are key components of the MMU-500. Multiple TBUs are connected > to a single TCU over an interconnect. Each TBU contains a TLB that > caches page tables. The MMU-500 implements a TBU for each connected > master, and the TBU is designed, so that it is local to the master. > > The Qualcomm SDM845 platform has an implementation of the SMMU-500, > that has multiple TBUs. A DT schema is added to describe the resources > for each TBU (register space, power-domains, interconnects and clocks). > > The TBU driver will manage the resources and allow the system to > operate the TBUs during a context fault to obtain details by doing > s1 inv, software + hardware page table walks etc. This is implemented > with ATOS/eCATs as the ATS feature is not supported. Being able to > query the TBUs is useful for debugging various hardware/software > issues on these platforms. > > v2: > - Improve DT binding description, add full example. (Konrad) > - Drop Qcom specific stuff from the generic binding. (Rob) > - Unconditionally try to populate subnodes. (Konrad) > - Improve TBU driver commit text, remove memory barriers. (Bjorn) > - Move TBU stuff into separate file. Make the driver builtin. > - TODO: Evaluate whether to keep TBU support as a separate driver > or just instantiate things from qcom_smmu_impl_init() > > v1: https://lore.kernel.org/r/20231019021923.13939-1-quic_c_gdjako@quicinc.com What is your suggested way to test this series ? --- bod