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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 88A97C433DB for ; Wed, 13 Jan 2021 12:42:32 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 0F5F12339F for ; Wed, 13 Jan 2021 12:42:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F5F12339F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.66465.118045 (Exim 4.92) (envelope-from ) id 1kzfTb-00069X-NV; Wed, 13 Jan 2021 12:42:15 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 66465.118045; Wed, 13 Jan 2021 12:42:15 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kzfTb-00069Q-Jg; Wed, 13 Jan 2021 12:42:15 +0000 Received: by outflank-mailman (input) for mailman id 66465; Wed, 13 Jan 2021 12:42:14 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kzfTa-00069L-Ba for xen-devel@lists.xenproject.org; Wed, 13 Jan 2021 12:42:14 +0000 Received: from verein.lst.de (unknown [213.95.11.211]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 48db8163-7f3d-4006-aa35-d9ec9c4ede7c; Wed, 13 Jan 2021 12:42:13 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 3EA2768B02; Wed, 13 Jan 2021 13:42:09 +0100 (CET) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 48db8163-7f3d-4006-aa35-d9ec9c4ede7c Date: Wed, 13 Jan 2021 13:42:09 +0100 From: Christoph Hellwig To: Claire Chang Cc: robh+dt@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, joro@8bytes.org, will@kernel.org, frowand.list@gmail.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, grant.likely@arm.com, xypron.glpk@gmx.de, treding@nvidia.com, mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, gregkh@linuxfoundation.org, saravanak@google.com, rafael.j.wysocki@intel.com, heikki.krogerus@linux.intel.com, andriy.shevchenko@linux.intel.com, rdunlap@infradead.org, dan.j.williams@intel.com, bgolaszewski@baylibre.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, xen-devel@lists.xenproject.org, tfiga@chromium.org, drinkcat@chromium.org Subject: Re: [RFC PATCH v3 2/6] swiotlb: Add restricted DMA pool Message-ID: <20210113124209.GA1383@lst.de> References: <20210106034124.30560-1-tientzu@chromium.org> <20210106034124.30560-3-tientzu@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210106034124.30560-3-tientzu@chromium.org> User-Agent: Mutt/1.5.17 (2007-11-01) > +#ifdef CONFIG_SWIOTLB > + struct io_tlb_mem *dma_io_tlb_mem; > #endif Please add a new config option for this code instead of always building it when swiotlb is enabled. > +static int swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start, > + size_t size) Can you split the refactoring in swiotlb.c into one or more prep patches? > +static int rmem_swiotlb_device_init(struct reserved_mem *rmem, > + struct device *dev) > +{ > + struct io_tlb_mem *mem = rmem->priv; > + int ret; > + > + if (dev->dma_io_tlb_mem) > + return -EBUSY; > + > + if (!mem) { > + mem = kzalloc(sizeof(*mem), GFP_KERNEL); > + if (!mem) > + return -ENOMEM; What is the calling convention here that allows for a NULL and non-NULL private data?