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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 772DFC47420 for ; Thu, 1 Oct 2020 08:16:08 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 1216220708 for ; Thu, 1 Oct 2020 08:16:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=crapouillou.net header.i=@crapouillou.net header.b="e5yEacMl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1216220708 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=crapouillou.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8AAF96E85A; Thu, 1 Oct 2020 08:15:45 +0000 (UTC) Received: from crapouillou.net (crapouillou.net [89.234.176.41]) by gabe.freedesktop.org (Postfix) with ESMTPS id C446089E33 for ; Wed, 30 Sep 2020 16:46:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1601484381; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kcU9yGQD6B2scIkP8pZMunYb7NCYboP62O9RzuBiMUg=; b=e5yEacMlg4Kfj0LdZISIy62btPD+Kf07vKS+EHO4xQptlsFf8HdJuhMyyohm8+crHHHjSy jsX5npmo3IfEfkAqRz17BIf7NIMxcagguh/dm9LMoVZghVcOhmCUXXBeLmYGpPKaSqVWg/ aT8C+t/LQY7FXAkOcXDLdPQTGnjLBmM= Date: Wed, 30 Sep 2020 18:45:02 +0200 From: Paul Cercueil Subject: Re: linux-next: build failure after merge of the drm tree To: Christoph Hellwig Message-Id: <27DHHQ.SLESFBOY1GXP1@crapouillou.net> In-Reply-To: <20200930164023.GA8645@lst.de> References: <20200928060427.GA15041@lst.de> <20200928113415.GA555@lst.de> <72ADHQ.T6LL1SHQF0RG3@crapouillou.net> <20200928121002.GA3219@lst.de> <20200930090252.GA9357@lst.de> <20200930161124.GA6859@lst.de> <20200930164023.GA8645@lst.de> MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 01 Oct 2020 08:15:43 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Airlie , Stephen Rothwell , Linux Next Mailing List , Linux Kernel Mailing List , DRI Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Le mer. 30 sept. 2020 =E0 18:40, Christoph Hellwig a =E9crit = : > On Wed, Sep 30, 2020 at 06:39:18PM +0200, Paul Cercueil wrote: >>> dma_alloc_pages gives you cached memory, so you can't just use an >>> uncached protection for the userspace mmap here. If you want = >>> uncached >>> memory you need to use dma_alloc_coherent paired with = >>> dma_mmap_coherent. >>> Or dma_alloc_wc for a slightly different flavor of uncached. (both >>> of the map to dma_alloc_attrs / dma_mmap_attrs eventually). >> = >> I don't want uncached memory, I want non-coherent cached memory. > = > We don't have such a thing in the Linux API at all. dma_pgprot(dev, vma->vm_page_prot, DMA_ATTR_NON_CONSISTENT); That was giving me non-coherent cached memory, and now I don't have an = alternative. -Paul _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel