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 X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E820C282C0 for ; Fri, 25 Jan 2019 11:30:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9B19217D7 for ; Fri, 25 Jan 2019 11:30:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="D7hsD2HS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728529AbfAYLag (ORCPT ); Fri, 25 Jan 2019 06:30:36 -0500 Received: from mail-wm1-f65.google.com ([209.85.128.65]:56057 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728243AbfAYLa2 (ORCPT ); Fri, 25 Jan 2019 06:30:28 -0500 Received: by mail-wm1-f65.google.com with SMTP id y139so6351774wmc.5 for ; Fri, 25 Jan 2019 03:30:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=reply-to:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=sCdp2Rt8P2db7n8Wc/FgdknXH7w2aWs6zOYycWOYUKw=; b=D7hsD2HSGukLPUiAdy7pxgVxpTIlbFUspp94Zb1X3ecIViMsWAF3a6dQdKxb16wgSK 2jJJD1gqPACPdAwYKe67IMrXSiSdgTd+GtUZVmSJjI85YFdc5ruBBREFor0J13cxHvEp mik/KbUPn+jlyilaviJf+ZRpZpC2NgsnkWqax8AwGC157ULRioO2BW65g1mTkpJx+2JG UdCGw+7Wk5AKrnTygjPCxIz5+k9u+YLpvhXP+S1zJVP0yn8J2+ol714AUW3+c+NT5J/m CWMGxGNajjrXdHZBeJvKVGG7q9otj8bUVQoOFHMfPWflfQBzUlbJtFYS/ILRmaUODDTJ javw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:subject:to:cc:references:from :message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding:content-language; bh=sCdp2Rt8P2db7n8Wc/FgdknXH7w2aWs6zOYycWOYUKw=; b=pWunyWDytb1mEtw+0PZZoVEmYUe4GtxRzYHvhU91MbAfjc6YN9TGiTBylsvIIjCbgP 3xTZoPgI2eirR+B9r/ecyYCOzsGAj3bdQ93g0EUJW7oZpCbi9M8NOwzZ9IChDKg890HW rZ9x/3Nzgg1abu8UFTDQk1qfFKRrGkgqL0Bhx7yuwGiD7BIObu9ODPxF7PAhoD46weks fvQv5AoyOHpAbXgUjlHy2hK4u4MQ2Ol5vew35FDa3z98NghAhDyouNM/EVhoFF6mayY+ 5xQ9rnvjVEgGof56A2czHRokU7Fj8GwGqG/TYZzqoPcDi1AYFGLcoM/EyNwC2Zbtc1wg zSGg== X-Gm-Message-State: AJcUukdMpltGFpywGWeE/BshLiiTffMX/P72izODa7fV6/rlufS8daU0 lNPXNYz8iiUArL0lQ5ouSTs= X-Google-Smtp-Source: ALg8bN7kx19hKSpc1uuOm4Ioz6PhXpMkVoP20wE7P34Sg70Lt+9UZyYG+elF2rJDrqyKlqIq4GqDHw== X-Received: by 2002:a7b:c4cb:: with SMTP id g11mr6491725wmk.149.1548415825578; Fri, 25 Jan 2019 03:30:25 -0800 (PST) Received: from ?IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7? ([2a02:908:1252:fb60:be8a:bd56:1f94:86e7]) by smtp.gmail.com with ESMTPSA id p5sm33889642wmh.16.2019.01.25.03.30.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 25 Jan 2019 03:30:25 -0800 (PST) Reply-To: christian.koenig@amd.com Subject: Re: [PATCH] drm: enable uncached DMA optimization for ARM and arm64 To: Ard Biesheuvel , Alex Deucher Cc: "Daenzer, Michel" , Carsten Haitzler , Maxime Ripard , "linux-kernel@vger.kernel.org" , dri-devel , "Zhang, Jerry" , Christoph Hellwig , David Airlie , "Huang, Ray" , amd-gfx list , Michael Ellerman , Will Deacon , "Deucher, Alexander" , Sean Paul , "Koenig, Christian" , "linux-arm-kernel@lists.infradead.org" , Robin Murphy References: <20190124120658.30288-1-ard.biesheuvel@linaro.org> <3cca35a9-c71c-a100-b29d-31ba0d1d10b1@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <961e758d-b0a0-8f6c-a8fa-c3047e058706@gmail.com> Date: Fri, 25 Jan 2019 12:30:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 25.01.19 um 09:43 schrieb Ard Biesheuvel: > On Thu, 24 Jan 2019 at 15:01, Alex Deucher wrote: >> On Thu, Jan 24, 2019 at 9:00 AM Ard Biesheuvel >> wrote: >>> On Thu, 24 Jan 2019 at 13:31, Koenig, Christian >>> wrote: >>>> Am 24.01.19 um 13:06 schrieb Ard Biesheuvel: >>>>> The DRM driver stack is designed to work with cache coherent devices >>>>> only, but permits an optimization to be enabled in some cases, where >>>>> for some buffers, both the CPU and the GPU use uncached mappings, >>>>> removing the need for DMA snooping and allocation in the CPU caches. >>>>> >>>>> The use of uncached GPU mappings relies on the correct implementation >>>>> of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU >>>>> will use cached mappings nonetheless. On x86 platforms, this does not >>>>> seem to matter, as uncached CPU mappings will snoop the caches in any >>>>> case. However, on ARM and arm64, enabling this optimization on a >>>>> platform where NoSnoop is ignored results in loss of coherency, which >>>>> breaks correct operation of the device. Since we have no way of >>>>> detecting whether NoSnoop works or not, just disable this >>>>> optimization entirely for ARM and arm64. >>>>> >>>>> Cc: Christian Koenig >>>>> Cc: Alex Deucher >>>>> Cc: David Zhou >>>>> Cc: Huang Rui >>>>> Cc: Junwei Zhang >>>>> Cc: Michel Daenzer >>>>> Cc: David Airlie >>>>> Cc: Daniel Vetter >>>>> Cc: Maarten Lankhorst >>>>> Cc: Maxime Ripard >>>>> Cc: Sean Paul >>>>> Cc: Michael Ellerman >>>>> Cc: Benjamin Herrenschmidt >>>>> Cc: Will Deacon >>>>> Cc: Christoph Hellwig >>>>> Cc: Robin Murphy >>>>> Cc: amd-gfx list >>>>> Cc: dri-devel >>>>> Reported-by: Carsten Haitzler >>>>> Signed-off-by: Ard Biesheuvel >>>> The subject line should probably read "disable uncached...". >>>> >>> Ugh, of course ... >>> >>>> With that fixed the patch is Reviewed-by: Christian König >>>> . >>>> >> Same: >> Reviewed-by: Alex Deucher >> > Thanks all > > Should I resend the patch with the subject corrected? I will update the subject line and push it upstream through drm-misc-next if nobody objects. Christian. > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel 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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41A20C282C0 for ; Fri, 25 Jan 2019 11:30:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 10E73217D7 for ; Fri, 25 Jan 2019 11:30:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DsNF5AnJ"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="D7hsD2HS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 10E73217D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:Reply-To:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Vo1kMDZOppBkSdMxje5djlWJ18Y3osC/pKojsURpTxs=; b=DsNF5AnJsqeV4t dLqux4F62Eb+6dsRbIpdEoPhZE+gCuaAwbePiK0U66gmE6tOceCX957jjcWs8WXXipgNSJ6M8EFYL bCgHCRI9/9Y13J1RmU1hPk2Uw//8yjVqQdWCugfaoMFqHvDwGL0QDSs8e87LaHyLI5xhNsaptrRy+ fP1BFZ8oG6kvFXlCMlwgSi71ba3MAZWjRyqhkg2p9bO/anwr4cClHj7OtSuVy2sCAGPzhc96ndvoE ro8vn9QQJGbHlBKzBZiOx43eUFaCWW9hz2mqHYFjM3vD+JTJ5xRF97Z9ngn6eJZZ1gABsMMWBSX0m 3Z1HadaoSpUEvCCJyguQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gmzgu-0003PJ-H8; Fri, 25 Jan 2019 11:30:32 +0000 Received: from mail-wm1-x341.google.com ([2a00:1450:4864:20::341]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gmzgq-0003OD-Lc for linux-arm-kernel@lists.infradead.org; Fri, 25 Jan 2019 11:30:31 +0000 Received: by mail-wm1-x341.google.com with SMTP id r24so4585229wmh.0 for ; Fri, 25 Jan 2019 03:30:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=reply-to:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=sCdp2Rt8P2db7n8Wc/FgdknXH7w2aWs6zOYycWOYUKw=; b=D7hsD2HSGukLPUiAdy7pxgVxpTIlbFUspp94Zb1X3ecIViMsWAF3a6dQdKxb16wgSK 2jJJD1gqPACPdAwYKe67IMrXSiSdgTd+GtUZVmSJjI85YFdc5ruBBREFor0J13cxHvEp mik/KbUPn+jlyilaviJf+ZRpZpC2NgsnkWqax8AwGC157ULRioO2BW65g1mTkpJx+2JG UdCGw+7Wk5AKrnTygjPCxIz5+k9u+YLpvhXP+S1zJVP0yn8J2+ol714AUW3+c+NT5J/m CWMGxGNajjrXdHZBeJvKVGG7q9otj8bUVQoOFHMfPWflfQBzUlbJtFYS/ILRmaUODDTJ javw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:subject:to:cc:references:from :message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding:content-language; bh=sCdp2Rt8P2db7n8Wc/FgdknXH7w2aWs6zOYycWOYUKw=; b=sJty4vu7Or9QufoaWeVN480S+0BwJ8VxVy/qagIRxmVzJ9bPoO0/XLZuYb2Mz49yWX yJGlZvDe0lCvfDSMX88QgYMCjgGqaQ402GLNo4p0TpBvoiC+JfsWDHheTNMKRBBBBun8 hecoM9+VxFd6Rg10s5nOCjo+i8L5T08BVLCVqBpIM/F/1tIGmGgiPBVg81Y1/s0YW37T eEY5LMWoKDcHVz5Rj3Rn0cxNopXJb028BQiN/55t9UJ95EkLLwYUlGdLXcFqRqzgJbAZ qFM3Ye5+PsWOSn/KNtft8H0/9ZgyWtKGyv8/mjRgKuew6894yYpdd9NZONo0/U9reGnX OpOw== X-Gm-Message-State: AJcUukeVk8WZ6bqgA92u7x1FkKixLKWEqcKy/ZP/bdi35tm8pBzM23mz SaFRNMPdoiU/yorfEe3WyHo= X-Google-Smtp-Source: ALg8bN7kx19hKSpc1uuOm4Ioz6PhXpMkVoP20wE7P34Sg70Lt+9UZyYG+elF2rJDrqyKlqIq4GqDHw== X-Received: by 2002:a7b:c4cb:: with SMTP id g11mr6491725wmk.149.1548415825578; Fri, 25 Jan 2019 03:30:25 -0800 (PST) Received: from ?IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7? ([2a02:908:1252:fb60:be8a:bd56:1f94:86e7]) by smtp.gmail.com with ESMTPSA id p5sm33889642wmh.16.2019.01.25.03.30.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 25 Jan 2019 03:30:25 -0800 (PST) Subject: Re: [PATCH] drm: enable uncached DMA optimization for ARM and arm64 To: Ard Biesheuvel , Alex Deucher References: <20190124120658.30288-1-ard.biesheuvel@linaro.org> <3cca35a9-c71c-a100-b29d-31ba0d1d10b1@amd.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <961e758d-b0a0-8f6c-a8fa-c3047e058706@gmail.com> Date: Fri, 25 Jan 2019 12:30:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190125_033028_745809_1DA14E80 X-CRM114-Status: GOOD ( 16.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: christian.koenig@amd.com Cc: Will Deacon , Carsten Haitzler , Maxime Ripard , Michael Ellerman , "Daenzer, Michel" , "linux-kernel@vger.kernel.org" , dri-devel , Christoph Hellwig , David Airlie , "Huang, Ray" , amd-gfx list , "Zhang, Jerry" , "Deucher, Alexander" , Sean Paul , "Koenig, Christian" , "linux-arm-kernel@lists.infradead.org" , Robin Murphy Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org QW0gMjUuMDEuMTkgdW0gMDk6NDMgc2NocmllYiBBcmQgQmllc2hldXZlbDoKPiBPbiBUaHUsIDI0 IEphbiAyMDE5IGF0IDE1OjAxLCBBbGV4IERldWNoZXIgPGFsZXhkZXVjaGVyQGdtYWlsLmNvbT4g d3JvdGU6Cj4+IE9uIFRodSwgSmFuIDI0LCAyMDE5IGF0IDk6MDAgQU0gQXJkIEJpZXNoZXV2ZWwK Pj4gPGFyZC5iaWVzaGV1dmVsQGxpbmFyby5vcmc+IHdyb3RlOgo+Pj4gT24gVGh1LCAyNCBKYW4g MjAxOSBhdCAxMzozMSwgS29lbmlnLCBDaHJpc3RpYW4KPj4+IDxDaHJpc3RpYW4uS29lbmlnQGFt ZC5jb20+IHdyb3RlOgo+Pj4+IEFtIDI0LjAxLjE5IHVtIDEzOjA2IHNjaHJpZWIgQXJkIEJpZXNo ZXV2ZWw6Cj4+Pj4+IFRoZSBEUk0gZHJpdmVyIHN0YWNrIGlzIGRlc2lnbmVkIHRvIHdvcmsgd2l0 aCBjYWNoZSBjb2hlcmVudCBkZXZpY2VzCj4+Pj4+IG9ubHksIGJ1dCBwZXJtaXRzIGFuIG9wdGlt aXphdGlvbiB0byBiZSBlbmFibGVkIGluIHNvbWUgY2FzZXMsIHdoZXJlCj4+Pj4+IGZvciBzb21l IGJ1ZmZlcnMsIGJvdGggdGhlIENQVSBhbmQgdGhlIEdQVSB1c2UgdW5jYWNoZWQgbWFwcGluZ3Ms Cj4+Pj4+IHJlbW92aW5nIHRoZSBuZWVkIGZvciBETUEgc25vb3BpbmcgYW5kIGFsbG9jYXRpb24g aW4gdGhlIENQVSBjYWNoZXMuCj4+Pj4+Cj4+Pj4+IFRoZSB1c2Ugb2YgdW5jYWNoZWQgR1BVIG1h cHBpbmdzIHJlbGllcyBvbiB0aGUgY29ycmVjdCBpbXBsZW1lbnRhdGlvbgo+Pj4+PiBvZiB0aGUg UENJZSBOb1Nub29wIFRMUCBhdHRyaWJ1dGUgYnkgdGhlIHBsYXRmb3JtLCBvdGhlcndpc2UgdGhl IEdQVQo+Pj4+PiB3aWxsIHVzZSBjYWNoZWQgbWFwcGluZ3Mgbm9uZXRoZWxlc3MuIE9uIHg4NiBw bGF0Zm9ybXMsIHRoaXMgZG9lcyBub3QKPj4+Pj4gc2VlbSB0byBtYXR0ZXIsIGFzIHVuY2FjaGVk IENQVSBtYXBwaW5ncyB3aWxsIHNub29wIHRoZSBjYWNoZXMgaW4gYW55Cj4+Pj4+IGNhc2UuIEhv d2V2ZXIsIG9uIEFSTSBhbmQgYXJtNjQsIGVuYWJsaW5nIHRoaXMgb3B0aW1pemF0aW9uIG9uIGEK Pj4+Pj4gcGxhdGZvcm0gd2hlcmUgTm9Tbm9vcCBpcyBpZ25vcmVkIHJlc3VsdHMgaW4gbG9zcyBv ZiBjb2hlcmVuY3ksIHdoaWNoCj4+Pj4+IGJyZWFrcyBjb3JyZWN0IG9wZXJhdGlvbiBvZiB0aGUg ZGV2aWNlLiBTaW5jZSB3ZSBoYXZlIG5vIHdheSBvZgo+Pj4+PiBkZXRlY3Rpbmcgd2hldGhlciBO b1Nub29wIHdvcmtzIG9yIG5vdCwganVzdCBkaXNhYmxlIHRoaXMKPj4+Pj4gb3B0aW1pemF0aW9u IGVudGlyZWx5IGZvciBBUk0gYW5kIGFybTY0Lgo+Pj4+Pgo+Pj4+PiBDYzogQ2hyaXN0aWFuIEtv ZW5pZyA8Y2hyaXN0aWFuLmtvZW5pZ0BhbWQuY29tPgo+Pj4+PiBDYzogQWxleCBEZXVjaGVyIDxh bGV4YW5kZXIuZGV1Y2hlckBhbWQuY29tPgo+Pj4+PiBDYzogRGF2aWQgWmhvdSA8RGF2aWQxLlpo b3VAYW1kLmNvbT4KPj4+Pj4gQ2M6IEh1YW5nIFJ1aSA8cmF5Lmh1YW5nQGFtZC5jb20+Cj4+Pj4+ IENjOiBKdW53ZWkgWmhhbmcgPEplcnJ5LlpoYW5nQGFtZC5jb20+Cj4+Pj4+IENjOiBNaWNoZWwg RGFlbnplciA8bWljaGVsLmRhZW56ZXJAYW1kLmNvbT4KPj4+Pj4gQ2M6IERhdmlkIEFpcmxpZSA8 YWlybGllZEBsaW51eC5pZT4KPj4+Pj4gQ2M6IERhbmllbCBWZXR0ZXIgPGRhbmllbEBmZndsbC5j aD4KPj4+Pj4gQ2M6IE1hYXJ0ZW4gTGFua2hvcnN0IDxtYWFydGVuLmxhbmtob3JzdEBsaW51eC5p bnRlbC5jb20+Cj4+Pj4+IENjOiBNYXhpbWUgUmlwYXJkIDxtYXhpbWUucmlwYXJkQGJvb3RsaW4u Y29tPgo+Pj4+PiBDYzogU2VhbiBQYXVsIDxzZWFuQHBvb3JseS5ydW4+Cj4+Pj4+IENjOiBNaWNo YWVsIEVsbGVybWFuIDxtcGVAZWxsZXJtYW4uaWQuYXU+Cj4+Pj4+IENjOiBCZW5qYW1pbiBIZXJy ZW5zY2htaWR0IDxiZW5oQGtlcm5lbC5jcmFzaGluZy5vcmc+Cj4+Pj4+IENjOiBXaWxsIERlYWNv biA8d2lsbC5kZWFjb25AYXJtLmNvbT4KPj4+Pj4gQ2M6IENocmlzdG9waCBIZWxsd2lnIDxoY2hA aW5mcmFkZWFkLm9yZz4KPj4+Pj4gQ2M6IFJvYmluIE11cnBoeSA8cm9iaW4ubXVycGh5QGFybS5j b20+Cj4+Pj4+IENjOiBhbWQtZ2Z4IGxpc3QgPGFtZC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3Jn Pgo+Pj4+PiBDYzogZHJpLWRldmVsIDxkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnPgo+ Pj4+PiBSZXBvcnRlZC1ieTogQ2Fyc3RlbiBIYWl0emxlciA8Q2Fyc3Rlbi5IYWl0emxlckBhcm0u Y29tPgo+Pj4+PiBTaWduZWQtb2ZmLWJ5OiBBcmQgQmllc2hldXZlbCA8YXJkLmJpZXNoZXV2ZWxA bGluYXJvLm9yZz4KPj4+PiBUaGUgc3ViamVjdCBsaW5lIHNob3VsZCBwcm9iYWJseSByZWFkICJk aXNhYmxlIHVuY2FjaGVkLi4uIi4KPj4+Pgo+Pj4gVWdoLCBvZiBjb3Vyc2UgLi4uCj4+Pgo+Pj4+ IFdpdGggdGhhdCBmaXhlZCB0aGUgcGF0Y2ggaXMgUmV2aWV3ZWQtYnk6IENocmlzdGlhbiBLw7Zu aWcKPj4+PiA8Y2hyaXN0aWFuLmtvZW5pZ0BhbWQuY29tPi4KPj4+Pgo+PiBTYW1lOgo+PiBSZXZp ZXdlZC1ieTogQWxleCBEZXVjaGVyIDxhbGV4YW5kZXIuZGV1Y2hlckBhbWQuY29tPgo+Pgo+IFRo YW5rcyBhbGwKPgo+IFNob3VsZCBJIHJlc2VuZCB0aGUgcGF0Y2ggd2l0aCB0aGUgc3ViamVjdCBj b3JyZWN0ZWQ/CgpJIHdpbGwgdXBkYXRlIHRoZSBzdWJqZWN0IGxpbmUgYW5kIHB1c2ggaXQgdXBz dHJlYW0gdGhyb3VnaCAKZHJtLW1pc2MtbmV4dCBpZiBub2JvZHkgb2JqZWN0cy4KCkNocmlzdGlh bi4KCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBk cmktZGV2ZWwgbWFpbGluZyBsaXN0Cj4gZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwo+ IGh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgt YXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQu b3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJt LWtlcm5lbAo= From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?Q?Christian_K=c3=b6nig?= Subject: Re: [PATCH] drm: enable uncached DMA optimization for ARM and arm64 Date: Fri, 25 Jan 2019 12:30:23 +0100 Message-ID: <961e758d-b0a0-8f6c-a8fa-c3047e058706@gmail.com> References: <20190124120658.30288-1-ard.biesheuvel@linaro.org> <3cca35a9-c71c-a100-b29d-31ba0d1d10b1@amd.com> Reply-To: christian.koenig@amd.com Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Ard Biesheuvel , Alex Deucher Cc: Will Deacon , Carsten Haitzler , Maxime Ripard , Michael Ellerman , "Daenzer, Michel" , "linux-kernel@vger.kernel.org" , dri-devel , Christoph Hellwig , David Airlie , "Huang, Ray" , amd-gfx list , "Zhang, Jerry" , "Deucher, Alexander" , Sean Paul , "Koenig, Christian" , "linux-arm-kernel@lists.infradead.org" , Robin Murphy List-Id: dri-devel@lists.freedesktop.org QW0gMjUuMDEuMTkgdW0gMDk6NDMgc2NocmllYiBBcmQgQmllc2hldXZlbDoKPiBPbiBUaHUsIDI0 IEphbiAyMDE5IGF0IDE1OjAxLCBBbGV4IERldWNoZXIgPGFsZXhkZXVjaGVyQGdtYWlsLmNvbT4g d3JvdGU6Cj4+IE9uIFRodSwgSmFuIDI0LCAyMDE5IGF0IDk6MDAgQU0gQXJkIEJpZXNoZXV2ZWwK Pj4gPGFyZC5iaWVzaGV1dmVsQGxpbmFyby5vcmc+IHdyb3RlOgo+Pj4gT24gVGh1LCAyNCBKYW4g MjAxOSBhdCAxMzozMSwgS29lbmlnLCBDaHJpc3RpYW4KPj4+IDxDaHJpc3RpYW4uS29lbmlnQGFt ZC5jb20+IHdyb3RlOgo+Pj4+IEFtIDI0LjAxLjE5IHVtIDEzOjA2IHNjaHJpZWIgQXJkIEJpZXNo ZXV2ZWw6Cj4+Pj4+IFRoZSBEUk0gZHJpdmVyIHN0YWNrIGlzIGRlc2lnbmVkIHRvIHdvcmsgd2l0 aCBjYWNoZSBjb2hlcmVudCBkZXZpY2VzCj4+Pj4+IG9ubHksIGJ1dCBwZXJtaXRzIGFuIG9wdGlt aXphdGlvbiB0byBiZSBlbmFibGVkIGluIHNvbWUgY2FzZXMsIHdoZXJlCj4+Pj4+IGZvciBzb21l IGJ1ZmZlcnMsIGJvdGggdGhlIENQVSBhbmQgdGhlIEdQVSB1c2UgdW5jYWNoZWQgbWFwcGluZ3Ms Cj4+Pj4+IHJlbW92aW5nIHRoZSBuZWVkIGZvciBETUEgc25vb3BpbmcgYW5kIGFsbG9jYXRpb24g aW4gdGhlIENQVSBjYWNoZXMuCj4+Pj4+Cj4+Pj4+IFRoZSB1c2Ugb2YgdW5jYWNoZWQgR1BVIG1h cHBpbmdzIHJlbGllcyBvbiB0aGUgY29ycmVjdCBpbXBsZW1lbnRhdGlvbgo+Pj4+PiBvZiB0aGUg UENJZSBOb1Nub29wIFRMUCBhdHRyaWJ1dGUgYnkgdGhlIHBsYXRmb3JtLCBvdGhlcndpc2UgdGhl IEdQVQo+Pj4+PiB3aWxsIHVzZSBjYWNoZWQgbWFwcGluZ3Mgbm9uZXRoZWxlc3MuIE9uIHg4NiBw bGF0Zm9ybXMsIHRoaXMgZG9lcyBub3QKPj4+Pj4gc2VlbSB0byBtYXR0ZXIsIGFzIHVuY2FjaGVk IENQVSBtYXBwaW5ncyB3aWxsIHNub29wIHRoZSBjYWNoZXMgaW4gYW55Cj4+Pj4+IGNhc2UuIEhv d2V2ZXIsIG9uIEFSTSBhbmQgYXJtNjQsIGVuYWJsaW5nIHRoaXMgb3B0aW1pemF0aW9uIG9uIGEK Pj4+Pj4gcGxhdGZvcm0gd2hlcmUgTm9Tbm9vcCBpcyBpZ25vcmVkIHJlc3VsdHMgaW4gbG9zcyBv ZiBjb2hlcmVuY3ksIHdoaWNoCj4+Pj4+IGJyZWFrcyBjb3JyZWN0IG9wZXJhdGlvbiBvZiB0aGUg ZGV2aWNlLiBTaW5jZSB3ZSBoYXZlIG5vIHdheSBvZgo+Pj4+PiBkZXRlY3Rpbmcgd2hldGhlciBO b1Nub29wIHdvcmtzIG9yIG5vdCwganVzdCBkaXNhYmxlIHRoaXMKPj4+Pj4gb3B0aW1pemF0aW9u IGVudGlyZWx5IGZvciBBUk0gYW5kIGFybTY0Lgo+Pj4+Pgo+Pj4+PiBDYzogQ2hyaXN0aWFuIEtv ZW5pZyA8Y2hyaXN0aWFuLmtvZW5pZ0BhbWQuY29tPgo+Pj4+PiBDYzogQWxleCBEZXVjaGVyIDxh bGV4YW5kZXIuZGV1Y2hlckBhbWQuY29tPgo+Pj4+PiBDYzogRGF2aWQgWmhvdSA8RGF2aWQxLlpo b3VAYW1kLmNvbT4KPj4+Pj4gQ2M6IEh1YW5nIFJ1aSA8cmF5Lmh1YW5nQGFtZC5jb20+Cj4+Pj4+ IENjOiBKdW53ZWkgWmhhbmcgPEplcnJ5LlpoYW5nQGFtZC5jb20+Cj4+Pj4+IENjOiBNaWNoZWwg RGFlbnplciA8bWljaGVsLmRhZW56ZXJAYW1kLmNvbT4KPj4+Pj4gQ2M6IERhdmlkIEFpcmxpZSA8 YWlybGllZEBsaW51eC5pZT4KPj4+Pj4gQ2M6IERhbmllbCBWZXR0ZXIgPGRhbmllbEBmZndsbC5j aD4KPj4+Pj4gQ2M6IE1hYXJ0ZW4gTGFua2hvcnN0IDxtYWFydGVuLmxhbmtob3JzdEBsaW51eC5p bnRlbC5jb20+Cj4+Pj4+IENjOiBNYXhpbWUgUmlwYXJkIDxtYXhpbWUucmlwYXJkQGJvb3RsaW4u Y29tPgo+Pj4+PiBDYzogU2VhbiBQYXVsIDxzZWFuQHBvb3JseS5ydW4+Cj4+Pj4+IENjOiBNaWNo YWVsIEVsbGVybWFuIDxtcGVAZWxsZXJtYW4uaWQuYXU+Cj4+Pj4+IENjOiBCZW5qYW1pbiBIZXJy ZW5zY2htaWR0IDxiZW5oQGtlcm5lbC5jcmFzaGluZy5vcmc+Cj4+Pj4+IENjOiBXaWxsIERlYWNv biA8d2lsbC5kZWFjb25AYXJtLmNvbT4KPj4+Pj4gQ2M6IENocmlzdG9waCBIZWxsd2lnIDxoY2hA aW5mcmFkZWFkLm9yZz4KPj4+Pj4gQ2M6IFJvYmluIE11cnBoeSA8cm9iaW4ubXVycGh5QGFybS5j b20+Cj4+Pj4+IENjOiBhbWQtZ2Z4IGxpc3QgPGFtZC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3Jn Pgo+Pj4+PiBDYzogZHJpLWRldmVsIDxkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnPgo+ Pj4+PiBSZXBvcnRlZC1ieTogQ2Fyc3RlbiBIYWl0emxlciA8Q2Fyc3Rlbi5IYWl0emxlckBhcm0u Y29tPgo+Pj4+PiBTaWduZWQtb2ZmLWJ5OiBBcmQgQmllc2hldXZlbCA8YXJkLmJpZXNoZXV2ZWxA bGluYXJvLm9yZz4KPj4+PiBUaGUgc3ViamVjdCBsaW5lIHNob3VsZCBwcm9iYWJseSByZWFkICJk aXNhYmxlIHVuY2FjaGVkLi4uIi4KPj4+Pgo+Pj4gVWdoLCBvZiBjb3Vyc2UgLi4uCj4+Pgo+Pj4+ IFdpdGggdGhhdCBmaXhlZCB0aGUgcGF0Y2ggaXMgUmV2aWV3ZWQtYnk6IENocmlzdGlhbiBLw7Zu aWcKPj4+PiA8Y2hyaXN0aWFuLmtvZW5pZ0BhbWQuY29tPi4KPj4+Pgo+PiBTYW1lOgo+PiBSZXZp ZXdlZC1ieTogQWxleCBEZXVjaGVyIDxhbGV4YW5kZXIuZGV1Y2hlckBhbWQuY29tPgo+Pgo+IFRo YW5rcyBhbGwKPgo+IFNob3VsZCBJIHJlc2VuZCB0aGUgcGF0Y2ggd2l0aCB0aGUgc3ViamVjdCBj b3JyZWN0ZWQ/CgpJIHdpbGwgdXBkYXRlIHRoZSBzdWJqZWN0IGxpbmUgYW5kIHB1c2ggaXQgdXBz dHJlYW0gdGhyb3VnaCAKZHJtLW1pc2MtbmV4dCBpZiBub2JvZHkgb2JqZWN0cy4KCkNocmlzdGlh bi4KCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBk cmktZGV2ZWwgbWFpbGluZyBsaXN0Cj4gZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwo+ IGh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2 ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9s aXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK