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dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=jcrouse@codeaurora.org From: Jordan Crouse To: freedreno@lists.freedesktop.org Subject: [PATCH v3 0/2] iommu/arm-smmu: Split pagetable support Date: Wed, 7 Aug 2019 16:19:44 -0600 Message-Id: <1565216386-28309-1-git-send-email-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190807_151955_102493_D6CC84B8 X-CRM114-Status: GOOD ( 13.92 ) 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: Rob Herring , Will Deacon , jean-philippe.brucker@arm.com, linux-arm-msm@vger.kernel.org, Joerg Roedel , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Zhen Lei , robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is part of an ongoing evolution for enabling split pagetable support for arm-smmu. Previous versions can be found [1]. In the discussion for v2 Robin pointed out that this is a very Adreno specific use case and that is exactly true. Not only do we want to configure and use a pagetable in the TTBR1 space, we also want to configure the TTBR0 region but not allocate a pagetable for it or touch it until the GPU hardware does so. As much as I want it to be a generic concept it really isn't. This revision leans into that idea. Most of the same io-pgtable code is there but now it is wrapped as an Adreno GPU specific format that is selected by the compatible string in the arm-smmu device. Additionally, per Robin's suggestion we are skipping creating a TTBR0 pagetable to save on wasted memory. This isn't as clean as I would like it to be but I think that this is a better direction than trying to pretend that the generic format would work. I'm tempting fate by posting this and then taking some time off, but I wanted to try to kick off a conversation or at least get some flames so I can try to refine this again next week. Please take a look and give some advice on the direction. [1] https://patchwork.freedesktop.org/series/63403/ Jordan Jordan Crouse (2): iommu/io-pgtable-arm: Add support for ARM_ADRENO_GPU_LPAE io-pgtable format iommu/arm-smmu: Add support for Adreno GPU pagetable formats drivers/iommu/arm-smmu.c | 8 +- drivers/iommu/io-pgtable-arm.c | 214 ++++++++++++++++++++++++++++++++++++++--- drivers/iommu/io-pgtable.c | 1 + include/linux/io-pgtable.h | 2 + 4 files changed, 209 insertions(+), 16 deletions(-) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel