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[109.252.91.213]) by smtp.googlemail.com with ESMTPSA id m88-v6sm11740lje.14.2018.09.24.11.41.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Sep 2018 11:41:22 -0700 (PDT) Subject: Re: [PATCH v4 03/20] iommu/tegra: gart: Ignore devices without IOMMU phandle in DT To: Thierry Reding Cc: Jonathan Hunter , Joerg Roedel , Rob Herring , Robin Murphy , iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <20180924004153.8232-1-digetx@gmail.com> <20180924004153.8232-4-digetx@gmail.com> <20180924100525.GE21032@ulmo> From: Dmitry Osipenko Message-ID: <8b3ece56-fda6-4e74-f69f-1e68b138e973@gmail.com> Date: Mon, 24 Sep 2018 21:41:21 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20180924100525.GE21032@ulmo> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/24/18 1:05 PM, Thierry Reding wrote: > On Mon, Sep 24, 2018 at 03:41:36AM +0300, Dmitry Osipenko wrote: >> GART can't handle all devices, hence ignore devices that aren't related >> to GART. IOMMU phandle must be explicitly assign to devices in the device >> tree. > > I think technically the GART can indeed handle all devices since it is > just a physical address region that can be used to remap other physical > addresses. That's not to say that doing so would be a good idea. So the > commit message here is slightly confusing, but other than that the idea > is good, so: > > Acked-by: Thierry Reding > It shouldn't be able to serve something like SDHCI, though I haven't tried to verify that.