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=-15.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 ED590C433DB for ; Mon, 18 Jan 2021 16:20:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B713522228 for ; Mon, 18 Jan 2021 16:20:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406267AbhARQTo (ORCPT ); Mon, 18 Jan 2021 11:19:44 -0500 Received: from foss.arm.com ([217.140.110.172]:38918 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406502AbhARQSy (ORCPT ); Mon, 18 Jan 2021 11:18:54 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5CF3C31B; Mon, 18 Jan 2021 08:18:07 -0800 (PST) Received: from [10.57.39.58] (unknown [10.57.39.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E86073F68F; Mon, 18 Jan 2021 08:18:04 -0800 (PST) Subject: Re: [PATCH v3 5/7] iommu: Allow io_pgtable_tlb ops optional To: Yong Wu , Joerg Roedel , Will Deacon Cc: Matthias Brugger , Krzysztof Kozlowski , Tomasz Figa , linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, youlin.pei@mediatek.com, Nicolas Boichat , anan.sun@mediatek.com, chao.hao@mediatek.com, Greg Kroah-Hartman , kernel-team@android.com References: <20201216103607.23050-1-yong.wu@mediatek.com> <20201216103607.23050-6-yong.wu@mediatek.com> From: Robin Murphy Message-ID: <310cc809-ac74-7048-8718-c65c815a1faa@arm.com> Date: Mon, 18 Jan 2021 16:18:05 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20201216103607.23050-6-yong.wu@mediatek.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-12-16 10:36, Yong Wu wrote: > This patch allows io_pgtable_tlb ops could be null since the IOMMU drivers > may use the tlb ops from iommu framework. There's not much in it, but I guess this does make more sense overall than just making .tlb_flush_all optional and drivers having to provide a full set of NULL callbacks. Reviewed-by: Robin Murphy > Signed-off-by: Yong Wu > --- > include/linux/io-pgtable.h | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h > index adde9e49be08..c81796814afa 100644 > --- a/include/linux/io-pgtable.h > +++ b/include/linux/io-pgtable.h > @@ -206,14 +206,16 @@ struct io_pgtable { > > static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop) > { > - iop->cfg.tlb->tlb_flush_all(iop->cookie); > + if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all) > + iop->cfg.tlb->tlb_flush_all(iop->cookie); > } > > static inline void > io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova, > size_t size, size_t granule) > { > - iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie); > + if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk) > + iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie); > } > > static inline void > @@ -221,7 +223,7 @@ io_pgtable_tlb_add_page(struct io_pgtable *iop, > struct iommu_iotlb_gather * gather, unsigned long iova, > size_t granule) > { > - if (iop->cfg.tlb->tlb_add_page) > + if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page) > iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie); > } > >