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Wed, 13 Jan 2021 03:42:39 +0000 Received: from mail-lj1-x22e.google.com ([2a00:1450:4864:20::22e]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzX3L-00028J-3o for linux-arm-kernel@lists.infradead.org; Wed, 13 Jan 2021 03:42:37 +0000 Received: by mail-lj1-x22e.google.com with SMTP id x23so954776lji.7 for ; Tue, 12 Jan 2021 19:42:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:references:in-reply-to:mime-version:thread-index:date :message-id:subject:to:cc; bh=wZtv4Wp0k1+kVLn+IzD/C4UZmlsZZshvjYhI5DRrlos=; b=hobRGsCyCR6djTWrCPxTgYzOYQgzXD7urHSRsmL/HwVfNyMhGm3JXPVpfJg3ViroOu d90SCCggCB7oqoPGnt5U90Bo+jJjD1y7mFzo0oh4vLSMKGEjFDRf+mr53Zwmq3MvQYAH Cheisv6SMIcWbIPJ6GkTbntYnGAuOoHd3xZmc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:references:in-reply-to:mime-version :thread-index:date:message-id:subject:to:cc; bh=wZtv4Wp0k1+kVLn+IzD/C4UZmlsZZshvjYhI5DRrlos=; b=Qo6z9bUYaxxpM8Ps68AbUT6Dg59aYEnPxLA4ZIL/YzSe3eMXDKdroOxnS5tWsxA/F7 w6tyW/TFefzbFcETDqXwFdMJelLqaCBcmaokjgMa+RB+P6pCd6OXahaPXysaSbAu5HXl o2QtJKUHqtdN3t9/UDxzve7xFrdk/1SHTFgZ4LNMhxgWEb4aGgb94/MHY8/HRq2KLfOG CL7f2X2lQpDLUyftnNywF+1oCvVeCyQFMNXOwD5DUEQu71YXIIaqyTTxNQN3toUsTDrh yw9kIMMrv1JLWarEY8m9AZemjJHsSXTIdZEkB1u0GtFCh0v4YlanBRMgbTc8obQ3rOnw D3MQ== X-Gm-Message-State: AOAM53240ydXlgv6c7wRzSpyOYX9Q8zcc8z9yiDfJ1q7O1zSveOMazKz zKpn3LUVObsX8y38CkBEenA53TzW7iMRzdpsnSoT/neHfN2bFopomp93H6vzZWr8wee+38keZEu KKDG0jDREogC/U3tCp+nKUnDqeg4ECMtbzArNrYPdPA== X-Google-Smtp-Source: ABdhPJz/9p+Jo7pPqEMN9WU5cLjsxTRkyhjHgsDxaRqqaieIN1ZN2xsUyhVUbm3GUDC3Lr+Noyqs2pzZ63JvR1k3sOM= X-Received: by 2002:a2e:87cb:: with SMTP id v11mr35622ljj.218.1610509351435; Tue, 12 Jan 2021 19:42:31 -0800 (PST) From: Bharat Gooty References: <20201016090833.1892-1-thunder.leizhen@huawei.com> <20201016090833.1892-2-thunder.leizhen@huawei.com> <20201128045328.2411772-1-f.fainelli@gmail.com> <9c6c6b7e-8c39-8c49-5c87-9b560c027841@broadcom.com> <18112862-a42e-95b1-39a3-2e414667f39b@broadcom.com> <8aaa7bb9-a81e-cd0e-8e67-360515313748@broadcom.com> In-Reply-To: <8aaa7bb9-a81e-cd0e-8e67-360515313748@broadcom.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJYRwz9pX5Jyucm5rMpslCh5CnEKgGJZVBeAXR0S0UA+QcFwQHWxQyrA0A9aRsBP+20OgJY+tGwAUXdy2oCZFV8YgIHX276AswAQI+oeQmyEA== Date: Wed, 13 Jan 2021 09:12:28 +0530 Message-ID: <3fc2b0174965ec6b911ab4bd73da1525@mail.gmail.com> Subject: RE: [PATCH v2 1/2] arm64: dts: broadcom: clear the warnings caused by empty dma-ranges To: Ray Jui , Arnd Bergmann X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210112_224235_456411_686BEC81 X-CRM114-Status: GOOD ( 27.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree , Florian Fainelli , Scott Branden , Arnd Bergmann , Ray Jui , Zhen Lei , linux-kernel , Rob Herring , Bjorn Andersson , Andy Gross , bcm-kernel-feedback-list , linux-arm-msm , linux-arm-kernel , Bharat Gooty Content-Type: multipart/mixed; boundary="===============5544658189873690461==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5544658189873690461== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000d0f84405b8bfed43" --000000000000d0f84405b8bfed43 Content-Type: text/plain; charset="UTF-8" Hello Ray, I had cross checked with Design and integration team. Yes we can set the "dma-rages" to 40 bit DMA ranges. Tested, it is working. Thanks, -Bharat -----Original Message----- From: Ray Jui Sent: Wednesday, January 13, 2021 2:28 AM To: Arnd Bergmann Cc: Florian Fainelli ; Bharat Gooty ; devicetree ; linux-kernel ; Arnd Bergmann ; Scott Branden ; Ray Jui ; linux-arm-msm ; Andy Gross ; Bjorn Andersson ; Rob Herring ; bcm-kernel-feedback-list ; Zhen Lei ; linux-arm-kernel Subject: Re: [PATCH v2 1/2] arm64: dts: broadcom: clear the warnings caused by empty dma-ranges On 1/12/2021 12:40 PM, Arnd Bergmann wrote: > On Tue, Jan 12, 2021 at 7:28 PM Ray Jui wrote: >> On 2020-12-15 7:49 a.m., Arnd Bergmann wrote: >>> On Tue, Dec 15, 2020 at 4:41 PM Florian Fainelli >>> wrote: >>>> >>>> On 12/15/2020 5:19 AM, Bharat Gooty wrote: >>>>> Since the IOMMU is disabled and DMA engine is on 32-bit bus, We can >>>>> not >>>>> give the complete DDR for the USB DMA. >>>>> So restricting the usable DAM size to 4GB. >>>> >>>> Thanks, can you make this a proper patch submission along with a Fixes: >>>> tag that is: >>>> >>>> Fixes: 2013a4b684b6 ("arm64: dts: broadcom: clear the warnings caused >>>> by >>>> empty dma-ranges") >>> >>> Yes, that would be helpful, though I would appreciate a better >>> description >>> that explains what is actually going on: is it the device or the bus >>> that >>> has the 32-bit limitation, and if it is indeed a bug in the device, why >>> do >>> you pretend that this is a 64-bit device on a 32-bit bus instead (this >>> could also use a comment in the dts file)? >>> >>> Arnd >>> >> >> Sorry for the delay in reply. Bharat finally got time to do some >> investigation to confirm the following: >> >> These USB controllers indeed can address 64-bit. However, on the bus >> internally, only 40-bits are connected to the interconnect of CCN. As a >> result, the 'dma-ranges' should be modified to address 40-bit in size. > > a 40-bit range is effectively the same as a 64-bit range though, so I > think you'll still need a driver quirk if the device cannot use the whole > 40 > bit addressing but is limited to 32 bits because of a bug in its dma > engine. > Bharat can correct me if I'm wrong, but I don't think we have a bug in the USB DMA engine that causes it can only address 32-bit. I believe we can set dma-ranges size to 40-bit here. The dma-range property is though required to be specified, instead of leaving it as empty, with the use of IOMMU. That seems to be a v5.10 specific behavior as I described below. Thanks, Ray >> We also have a somewhat related question, is it true that since v5.10, >> defining of 'dma-ranges' on the bus node where its child device node has >> implication of IOMMU usage (through 'iommus' or 'iommu-map') is now >> mandatory? My understanding is that the 'dma-ranges' in this scheme will >> define the IOVA address to system address mapping required by all >> devices on that bus. Please help to confirm if my understanding is >> correct > > I have not actually seen that change. In general, you should always > have a dma-ranges property in the parent of a DMA master, I think > we just never enforced that and fall back to a 32-bit mask by default. > > Arnd > -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. 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