Received: by 2002:a05:6a10:22f:0:0:0:0 with SMTP id 15csp1273946pxk; Fri, 18 Sep 2020 08:15:37 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwEe8obH1fTO7ytWRhVLRIPBf74oTiqtV0xdHwL7c9CwV8vCBINJvMgGc6hMirav9IcOcj9 X-Received: by 2002:a17:906:edc4:: with SMTP id sb4mr36176473ejb.144.1600442137127; Fri, 18 Sep 2020 08:15:37 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1600442137; cv=none; d=google.com; s=arc-20160816; b=wzpbVTu16DVDAeLnn8OaCXBIyA1SCqdECDgbotHOxbmDbA8fbohSrLmyrIyj4AguGL F/lMtUV1LFVskiYT1svM/T/z1Xr3UXLpszY4bU5o6A3DLEmxyNNfyiuySZQd9H39al/+ tX+u7XBdlBjTaxZzKqTovwA3jY55ORhT7zIgKnSuiY+XGuX08Xwr/5Rd2f8Gq+arAbLN QcigUyvFURtwzrn49cUxQ8UdTM1DTfRkfuAd0/z1hgwiC8oBwjeT6vCCCw874Kt3g+EM CffwHy07naBtPROCkOpCv3GHf6YJ6nPjssdshpfHnvH5hv/VzY54lVtiMQYySthivzNv dR4Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:references:cms-type:content-language :content-transfer-encoding:in-reply-to:mime-version:user-agent:date :message-id:cc:to:from:subject:dkim-signature:dkim-filter; bh=SZbHVV2JypCryt9GVj8eUqjOJnnk5VyYDZFqjnLzPdA=; b=T9rVgWzY46DQN+WGKznacZzMSd48Q89LaaiSkrMMuRb+otqfBJ/8i4hcuSKCJg3KGE Gw6Ih/Hsa74syvxlR4c83tZtSNkuCY3J4h7Lll3mBRYCaU8Wy/lILX33JubmE123g38u TONP/1E/BfiZ/tOjKAvfsKeN7Xcw8wekA64xNkZ4+aq9aRsXSTNlGhFFbCMafbyAJyGK tZ1h5wnDoIjIf8dMvGKqnjlHxn4jDpqSsD1ejSRoIcwvKpK+3aA2/NDhN637eZBpckCB 2yK/Sb3BA5G9Dv1Nw94WfW5l8xD54J7ADqRmqoV6teg1oyt+ViSwpReLdgE9H08NmV/l 1ifQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=JTFat9C0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id r25si2323447ejx.180.2020.09.18.08.15.13; Fri, 18 Sep 2020 08:15:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@samsung.com header.s=mail20170921 header.b=JTFat9C0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=samsung.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726299AbgIRPNZ (ORCPT + 99 others); Fri, 18 Sep 2020 11:13:25 -0400 Received: from mailout1.w1.samsung.com ([210.118.77.11]:51223 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726044AbgIRPNZ (ORCPT ); Fri, 18 Sep 2020 11:13:25 -0400 Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout1.w1.samsung.com (KnoxPortal) with ESMTP id 20200918151323euoutp0123aa6f886a15570d7e83d400494806ae~16YWyxQYe2958129581euoutp01A for ; Fri, 18 Sep 2020 15:13:23 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w1.samsung.com 20200918151323euoutp0123aa6f886a15570d7e83d400494806ae~16YWyxQYe2958129581euoutp01A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1600442003; bh=SZbHVV2JypCryt9GVj8eUqjOJnnk5VyYDZFqjnLzPdA=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JTFat9C0WXn81ciROxXFIIcowHMhlvZRdjq59LEqVPJHlJZz/h+jE3sW8fhkbMUUf zrz9Lq5reWgDIi/o0d664y65AQWogMlifALxhxPMCvhVSbfYRh9JQ4atYBuv/9UA/K +7PD6bOm303iF+bVH3MJVI8bifoU8uAbpF63BJEU= Received: from eusmges3new.samsung.com (unknown [203.254.199.245]) by eucas1p1.samsung.com (KnoxPortal) with ESMTP id 20200918151322eucas1p154435b3ed506dda02cbde20320f59e9d~16YWSYSP81330713307eucas1p1D; Fri, 18 Sep 2020 15:13:22 +0000 (GMT) Received: from eucas1p1.samsung.com ( [182.198.249.206]) by eusmges3new.samsung.com (EUCPMTA) with SMTP id BE.94.06318.29EC46F5; Fri, 18 Sep 2020 16:13:22 +0100 (BST) Received: from eusmtrp2.samsung.com (unknown [182.198.249.139]) by eucas1p2.samsung.com (KnoxPortal) with ESMTPA id 20200918151322eucas1p236126959c3cc725132450b228701ee72~16YV6FGzN2444524445eucas1p2S; Fri, 18 Sep 2020 15:13:22 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20200918151322eusmtrp2fd051ad885278f61b4ae44c30dc2a27d~16YV49JF20618906189eusmtrp2S; Fri, 18 Sep 2020 15:13:22 +0000 (GMT) X-AuditID: cbfec7f5-371ff700000018ae-d9-5f64ce927644 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 35.52.06017.19EC46F5; Fri, 18 Sep 2020 16:13:21 +0100 (BST) Received: from [106.210.88.143] (unknown [106.210.88.143]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200918151320eusmtip2208d181453ed3ef09a4f43c068dcffaa~16YUdkdOB0469904699eusmtip24; Fri, 18 Sep 2020 15:13:20 +0000 (GMT) Subject: Re: [PATCH 00/18] Convert arch/arm to use iommu-dma From: Marek Szyprowski To: Robin Murphy , hch@lst.de, joro@8bytes.org, linux@armlinux.org.uk Cc: will@kernel.org, inki.dae@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, agross@kernel.org, bjorn.andersson@linaro.org, thierry.reding@gmail.com, jonathanh@nvidia.com, vdumpa@nvidia.com, digetx@gmail.com, matthias.bgg@gmail.com, yong.wu@mediatek.com, geert+renesas@glider.be, magnus.damm@gmail.com, t-kristo@ti.com, s-anna@ti.com, laurent.pinchart@ideasonboard.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Message-ID: <693f4d91-7dd3-31e6-92b6-7ffa84dd3226@samsung.com> Date: Fri, 18 Sep 2020 17:13:22 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Transfer-Encoding: 8bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0yTZxTG9373Emo+ipMzXNjWuCWaiCKavYmE3ZN3f5gsiybGRFi3fkEU KuknOuaWVcBJO0VbM8Ci1SDGDbwwLpV7Q7V2BSkCiuhgdcLmysRiwE1B3Ww/2Pjvd55znpzz vHkFWnOVixcyDTsko0GXpeWiGOflx/7lNr8+faXzQDz2j8wwuMt1n8HVD0YQvvYwxOFj5TaE f6j2UNgWOMTgE661uNBewWBzeQ2Pu/Pv8dhsreRx7cgAi62ubh73Nx/l8P6aBhb3F/QiXNbT TmHzlJ3D7u/aEL5dPc7h/MJk3DExyuK26XYWlx0OcrjytyIOP252MLi47WNcOLQGB2x1zNsJ ZLTDQZEzjjOI9A/00sTavZw02Yd5Ul50hCW1VWaODA20ciTwrZcidZVfk8ODpxFpuWniSKHP xZADBfc5UlxfhYh38AL1UcymqBS9lJW5UzKuSP0kakvD30tyQos+7+zrpUyoQ2NBKgHE1WCu LqEsKErQiN8jmLzxiFaKKQQB0wSjFJMIDpb8RM9ZJjpLZxunEYz1HJ21hBDM7B1hw1OxYgp4 eu9GHJyYBJZxCxfmheJmmG58wocNtNjKgskWYMINtZgKp1pqIsyIr8Mvx5oi/KKYBpc778zO xIDvyOhzFgSV+Bb86IoOy7T4ChQ0lNMKx8Gt0eORQCCWqsC37xKrnP0+NJ5roBSOhTFvPa/w y/BP05yhAMGv/rO8UuxH0J9fhpSptTDkn+bCm2lxKZxvXqHI74BnuDUig7gABsdjlCMWgM1Z SiuyGoq+mX3sN8DuPfff2o6rffQhpLXPS2afF8c+L479/70nEFOF4qRcOTtDkpMN0q5EWZct 5xoyEj/bnl2Lnv/zrmfeh42o/cmnbiQKSBut/sOhT9ewup1yXrYbgUBrF6rf7e5K06j1urwv JOP2dGNuliS70WKB0capkyuCmzVihm6HtE2SciTjXJcSVPEmpDrVZmi2rHd6Uto148OrdoXe vLd1z0FH13WNGzlbSOzJnoRLX+7WvSenvXY24avFVyouBH/PGby959WYnLtBhy9+Xf3G4zPr 3Bf3Pc3c2JpXetL351ZPUmjpJHk0pR37C1le+rAuWPUB9BVbz6cyiSUbeJ+18oU1q/U3on+2 ZdzEWMvIW3RJy2ijrPsX0InXyeMDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA02Sa0hTYRjHe8/OOTtGi9Na9TK6cVIIoVOb6R5rmtWHTtCHLtSHrGy4w6yc k3NmZBTNHKGzJI3Ktlo3LdI+mJdM09YsMzMLM5aFaeEig7wUWXRBU1fgtx/P8/898MCfUajf UVpmT5pdlNJMqRw9lWwdae5eUvjMnLTs9GF41vubhFbfAAllX3oRvBwepOGCpxDBjbImAgp7 TpJwybcSnO4rJOR6ypXQdvSzEnILipVQ0RugoMDXpoSOuvM0HC+vpqAjux1B0fN7BOR+c9PQ eLoBwbuyfhqOOqPAPxSkoOHXPQqKTn2iofhDDg0/67wk5DdsBmdXNPQUVpIJ84Wg30sIN703 kdARaFcIBW1LhFr3W6XgyTlHCRWlubTQFainhZ68ZkKoLD4inOq8joS7rx204GzxkcKJ7AFa yK8qRUJzZw2xccZ23ijZMuziwhSbbI/jEnWg53WxwOuXx/K6KMPOFfpobmm80Sym7tkvSkvj d/Mp1T/C0wdnH3jyop1wIL/ahcIYzC7HQ0/Oki40lVGzJQg7L2crQou5uOWMgwrxTPwn4KJD oX6E60b6iPHFTNaIm9o/Tgg0q8Ou/vFQGKNhd+Jv18smWMHWU7ikXxuS7yN8dfTKhKxi43HJ 3XJynEk2AndfqJ3gWewu/PR4Hx3KzMAt54Jjc4YJY1fhW75poZsx2Fv5XhHiBTi72vOP5+A3 wYvESaR2T7LdkxT3JMU9SbmEyFKkETNkq8Uq63nZZJUz0ix8ss1agcbadfvRz6o7yDWwpRGx DOKmqfq85iQ1ZdovZ1obEWYUnEa1pq11l1plNmUeFCVbkpSRKsqNKHrstwKFdlaybayrafYk XbTOALE6Q5QhKga4Oaoc1r9DzVpMdnGfKKaL0n+PYMK0DrS4atHuZO4V72ww67v1XYPd0x8Y /X+k0b1r7eWRlhvVs0s9ZJ4U3HYm3JlXkxnewTpWboW5QwHNvPrECG1Wa+Kh4WtNceSUT/cj uc5lPz4WRaTHDA0/tGy2H6kZ3PT98Rrj+pIN7n1fdxxbN7ot/2Fn1peY1bUJI/m8hkjIYuIM HCmnmHSRCkk2/QUeyKrJcwMAAA== X-CMS-MailID: 20200918151322eucas1p236126959c3cc725132450b228701ee72 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200820150857eucas1p18f5f2ad87703a68b6ed20a090f7c1c57 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200820150857eucas1p18f5f2ad87703a68b6ed20a090f7c1c57 References: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, On 24.08.2020 13:40, Marek Szyprowski wrote: > On 20.08.2020 17:08, Robin Murphy wrote: >> After 5 years or so of intending to get round to this, finally the >> time comes! The changes themselves actualy turn out to be relatively >> mechanical; the bigger concern appears to be how to get everything >> merged across about 5 diffferent trees given the dependencies. >> >> I've lightly boot-tested things on Rockchip RK3288 and Exynos 4412 >> (Odroid-U3), to the degree that their display drivers should be using >> IOMMU-backed buffers and don't explode (the Odroid doesn't manage to >> send a working HDMI signal to the one monitor I have that it actually >> detects, but that's a pre-existing condition...) Confirmation that the >> Mediatek, OMAP and Tegra changes work will be most welcome. >> >> Patches are based on 5.9-rc1, branch available here: >> >>    git://linux-arm.org/linux-rm arm/dma > > Well, my first proposal for the ARM and ARM64 DMA-mapping unification > has been posted long time ago: https://lkml.org/lkml/2016/2/19/79 > > Thanks for resurrecting it! :) > > I've tested this patchset on various ARM32bit Exynos based boards (not > only Exynos4412) and most of them works fine after your conversion. > However there are issues you cannot learn from the code. > > Conversion of the Exynos DRM was straightforward (thanks!), but there > are other Exynos drivers that depends on the old ARM implementation. > The S5P-MFC (only for the v5 hardware) and Exynos4 FIMC-ISP drivers > depends on the first-fit IOVA allocation algorithm in the old ARM > DMA-mapping. This was the main reason I've didn't continue my initial > conversion attempt. > > Both drivers allocate a buffer for their firmware and then in the > hardware registers address video buffers as an offset from the > begginning of the firmware. This doesn't work when underlying > DMA-mapping allocates IOVA with the last-fit algorithm, what the > drivers/iommu/dma-iommu.c does. So far I didn't find a good solution > for that issue. > > I'm open for suggestions. One more limitation for the S5P-MFC driver > is that the hardware is capable only for addressing 128MiB. They will > probably need to call IOMMU API directly, but I would like to keep as > much from the IOMMU/DMA-mapping code as possible. Just for the record. I've finally managed to add needed workarounds to the both problematic Exynos4 drivers, so they work fine with this patchset. It turned out that it wasn't that hard: https://lore.kernel.org/linux-samsung-soc/20200918144833.14618-1-m.szyprowski@samsung.com/T/#t So from my side you have a green light to go ahead and switch ARM 32bit to generic code. Time to say good bye to the one of my biggest architecture related things merged once to mainline Linux. ;) Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland