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 BAD4BC433F5 for ; Thu, 20 Jan 2022 15:29:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 526BA6B009C; Thu, 20 Jan 2022 10:29:05 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4AF3D6B009F; Thu, 20 Jan 2022 10:29:05 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 377DA6B00A0; Thu, 20 Jan 2022 10:29:05 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0216.hostedemail.com [216.40.44.216]) by kanga.kvack.org (Postfix) with ESMTP id 278CB6B009C for ; Thu, 20 Jan 2022 10:29:05 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D3DAA92EA1 for ; Thu, 20 Jan 2022 15:29:04 +0000 (UTC) X-FDA: 79051048608.08.77F8258 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf13.hostedemail.com (Postfix) with ESMTP id 1BD9120002 for ; Thu, 20 Jan 2022 15:29:03 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 0BD2C68BEB; Thu, 20 Jan 2022 16:28:59 +0100 (CET) Date: Thu, 20 Jan 2022 16:28:58 +0100 From: Christoph Hellwig To: Keith Busch Cc: Christoph Hellwig , Jason Gunthorpe , Matthew Wilcox , linux-kernel@vger.kernel.org, Joao Martins , John Hubbard , Logan Gunthorpe , Ming Lei , linux-block@vger.kernel.org, netdev@vger.kernel.org, linux-mm@kvack.org, linux-rdma@vger.kernel.org, dri-devel@lists.freedesktop.org, nvdimm@lists.linux.dev Subject: Re: Phyr Starter Message-ID: <20220120152858.GA13263@lst.de> References: <20220111004126.GJ2328285@nvidia.com> <20220120135602.GA11223@lst.de> <20220120152736.GB383746@dhcp-10-100-145-180.wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220120152736.GB383746@dhcp-10-100-145-180.wdc.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Queue-Id: 1BD9120002 X-Stat-Signature: znbycpeodaho3y9izxxcigq7qxjbmw5n Authentication-Results: imf13.hostedemail.com; dkim=none; spf=none (imf13.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de; dmarc=none X-Rspamd-Server: rspam03 X-HE-Tag: 1642692543-321686 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: On Thu, Jan 20, 2022 at 07:27:36AM -0800, Keith Busch wrote: > It doesn't look like IOMMU page sizes are exported, or even necessarily > consistently sized on at least one arch (power). At the DMA API layer dma_get_merge_boundary is the API for it.