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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 EBDCEC3712F for ; Mon, 21 Jan 2019 22:14:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A8F8620861 for ; Mon, 21 Jan 2019 22:14:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="Qi4KHyTi"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ZyBN2eXV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727977AbfAUWOw (ORCPT ); Mon, 21 Jan 2019 17:14:52 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:59818 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726244AbfAUWOw (ORCPT ); Mon, 21 Jan 2019 17:14:52 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 4C4166089D; Mon, 21 Jan 2019 22:14:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1548108891; bh=2Do9kADCkKchsyiKfXpH8JSxZkbeS9z1teg11DYQXBA=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=Qi4KHyTi/xAyKwoeFwBnskghqsffAX/ydnE7d99oyEsFnrC2KLmhQxpBbUpUCosbK KPuyMF2UJtDSWsaoxOUk2HY9cNoie9pXZ8yEqf3wOBm6WaQy0w7uQbHhzJ9K1nGa84 3EpmWWL65Hx2cMZ3iiiay7aq+esxa7Ek7wkyar0M= Received: from lmark-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: lmark@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 297DF601D3; Mon, 21 Jan 2019 22:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1548108889; bh=2Do9kADCkKchsyiKfXpH8JSxZkbeS9z1teg11DYQXBA=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=ZyBN2eXVqBY4h5Efh8aDV8TEL+dIJX+dU8mBOvkca9sOo+IeEgMtArQ8nEAFd5YV1 7A1tji8XIEL8MBrmR1WCK/wSS0qhYN7ZTCPztVwbcAFKlotWw/cjdv+e15Qp4o2M5j Fs+IFnP9rRJh5vZflQzTgXJi+0pBF4Vri8X6hzA0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 297DF601D3 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=lmark@codeaurora.org Date: Mon, 21 Jan 2019 14:14:48 -0800 (PST) From: Liam Mark X-X-Sender: lmark@lmark-linux.qualcomm.com To: Christoph Hellwig cc: "Andrew F. Davis" , Laura Abbott , sumit.semwal@linaro.org, arve@android.com, tkjos@android.com, maco@android.com, joel@joelfernandes.org, christian@brauner.io, devel@driverdev.osuosl.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, john.stultz@linaro.org Subject: Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping attributes In-Reply-To: <20190121213028.GB28620@infradead.org> Message-ID: References: <1547836667-13695-1-git-send-email-lmark@codeaurora.org> <1547836667-13695-4-git-send-email-lmark@codeaurora.org> <20190119102527.GA17723@infradead.org> <7ae73c39-9049-bcf6-775f-b0817ba0ec5f@redhat.com> <20190121083046.GD12420@infradead.org> <0ed7875f-15e9-184f-5b99-9a53df7c8d14@ti.com> <20190121213028.GB28620@infradead.org> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 21 Jan 2019, Christoph Hellwig wrote: > On Mon, Jan 21, 2019 at 12:20:42PM -0800, Liam Mark wrote: > > I have left this to clients, but if they own the buffer they can have the > > knowledge as to whether CPU access is needed in that use case (example for > > post-processing). > > That is an API design which the user is more likely to get wrong than > right and thus does not pass the smell test. > With the previous version of ION Android ION clients were successfully managing all their cache maintenance. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project From mboxrd@z Thu Jan 1 00:00:00 1970 From: Liam Mark Subject: Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping attributes Date: Mon, 21 Jan 2019 14:14:48 -0800 (PST) Message-ID: References: <1547836667-13695-1-git-send-email-lmark@codeaurora.org> <1547836667-13695-4-git-send-email-lmark@codeaurora.org> <20190119102527.GA17723@infradead.org> <7ae73c39-9049-bcf6-775f-b0817ba0ec5f@redhat.com> <20190121083046.GD12420@infradead.org> <0ed7875f-15e9-184f-5b99-9a53df7c8d14@ti.com> <20190121213028.GB28620@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190121213028.GB28620@infradead.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" To: Christoph Hellwig Cc: devel@driverdev.osuosl.org, tkjos@android.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, "Andrew F. Davis" , linaro-mm-sig@lists.linaro.org, arve@android.com, john.stultz@linaro.org, joel@joelfernandes.org, maco@android.com, sumit.semwal@linaro.org, christian@brauner.io List-Id: dri-devel@lists.freedesktop.org On Mon, 21 Jan 2019, Christoph Hellwig wrote: > On Mon, Jan 21, 2019 at 12:20:42PM -0800, Liam Mark wrote: > > I have left this to clients, but if they own the buffer they can have the > > knowledge as to whether CPU access is needed in that use case (example for > > post-processing). > > That is an API design which the user is more likely to get wrong than > right and thus does not pass the smell test. > With the previous version of ION Android ION clients were successfully managing all their cache maintenance. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project