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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B41FAC4321E for ; Wed, 30 Nov 2022 23:32:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4B96E6B0071; Wed, 30 Nov 2022 18:32:14 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4695C6B0073; Wed, 30 Nov 2022 18:32:14 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 357C66B0074; Wed, 30 Nov 2022 18:32:14 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 2608A6B0071 for ; Wed, 30 Nov 2022 18:32:14 -0500 (EST) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id F30B616074B for ; Wed, 30 Nov 2022 23:32:13 +0000 (UTC) X-FDA: 80191709346.02.995C83B Received: from zulu616.server4you.de (mail.csgraf.de [85.25.223.15]) by imf24.hostedemail.com (Postfix) with ESMTP id 0E5C518001A for ; Wed, 30 Nov 2022 23:32:12 +0000 (UTC) Received: from [0.0.0.0] (ec2-3-122-114-9.eu-central-1.compute.amazonaws.com [3.122.114.9]) by csgraf.de (Postfix) with ESMTPSA id C8C3D60802DC; Thu, 1 Dec 2022 00:32:08 +0100 (CET) Message-ID: <629d62ce-b993-35fe-05ff-ee0befc0c73d@csgraf.de> Date: Thu, 1 Dec 2022 00:32:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH v3 13/13] dma: arm64: Add CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC and enable it for arm64 Content-Language: en-US To: Isaac Manjarres Cc: Catalin Marinas , Robin Murphy , Linus Torvalds , Arnd Bergmann , Greg Kroah-Hartman , Will Deacon , Marc Zyngier , Andrew Morton , Herbert Xu , Ard Biesheuvel , Saravana Kannan , Alasdair Kergon , Daniel Vetter , Joerg Roedel , Mark Brown , Mike Snitzer , "Rafael J. Wysocki" , linux-mm@kvack.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Christoph Hellwig References: <20221106220143.2129263-1-catalin.marinas@arm.com> <20221106220143.2129263-14-catalin.marinas@arm.com> <6e846f75-b330-9523-4356-41d5f9e48f12@arm.com> <20221108100331.GA31944@lst.de> From: Alexander Graf In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=none; spf=pass (imf24.hostedemail.com: domain of agraf@csgraf.de designates 85.25.223.15 as permitted sender) smtp.mailfrom=agraf@csgraf.de; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669851133; a=rsa-sha256; cv=none; b=N5X7o73GTXnFIXoox+vxWF2+roReVlU6b4hfZ34pG0JV+pRhFBjEMyMLP/+ISWEYjcKZff UqtQ0qvjLCxDCHaJ9+NTnraJzxhKlaN+pBKHfRBcyLjONs+Kf+igvv6NH4/1teHaigvpvA 1NrYwHWXHUykxj1rwRsPOkPCSEX6Hdo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669851133; 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=P2v3H7MaXIVL4UZLQko5HUDpCQnlUjZ5zhvzMJbo6AA=; b=c7d2chLt3TbsYXBc/oTA1Su6fEJoCfya1521qI5X9cp8UHLq4pf9/un/8IBz7/fTc5SH0x Javs+zKw1ZIP0R3aQZh/YGZ7xPFs7jLZzSEs5oz8XtxDqyvIEueMjiVXljDZalGBjiv3Ne BGVQv9p8oh1tOFzNcAHLmidCVA9SSXc= X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 0E5C518001A Authentication-Results: imf24.hostedemail.com; dkim=none; spf=pass (imf24.hostedemail.com: domain of agraf@csgraf.de designates 85.25.223.15 as permitted sender) smtp.mailfrom=agraf@csgraf.de; dmarc=none X-Stat-Signature: wuc3f6zmqtogyp477a1epru988y5t6yz X-HE-Tag: 1669851132-454430 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Isaac, On 30.11.22 19:48, Isaac Manjarres wrote: > On Tue, Nov 08, 2022 at 11:03:31AM +0100, Christoph Hellwig wrote: >> On Tue, Nov 08, 2022 at 09:52:15AM +0000, Catalin Marinas wrote: >>> Since it's hard to guess the optimal swiotlb buffer for such platforms, >>> I think a follow-up step would be to use the DMA coherent pool for >>> bouncing if no swiotlb buffer is available. At least the pool can grow >>> dynamically. Yet another option would be to increase the swiotlb buffer >>> at run-time but it has an overhead for is_swiotlb_buffer(). >> Alex said he wanted to look into growing the swiotlb buffer on demand >> for other reason, so adding him to Cc to check if there has been any >> progress on that. > Hi Alex, > > Did you get a chance to look into this? If so, have you been able to > make progress on being able to grow the SWIOTLB buffer on demand? I've been slightly under water and haven't been able to look at this yet :). It's on my list, but will probably be a while until I get to it. Would you be interested in having a first try? Thanks, Alex