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=-16.7 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 88C87C4338F for ; Fri, 20 Aug 2021 10:22:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A0C061131 for ; Fri, 20 Aug 2021 10:22:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237332AbhHTKX1 (ORCPT ); Fri, 20 Aug 2021 06:23:27 -0400 Received: from foss.arm.com ([217.140.110.172]:58326 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237258AbhHTKX0 (ORCPT ); Fri, 20 Aug 2021 06:23:26 -0400 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 01F0D101E; Fri, 20 Aug 2021 03:22:49 -0700 (PDT) Received: from [192.168.1.179] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EE5173F70D; Fri, 20 Aug 2021 03:22:46 -0700 (PDT) Subject: Re: [PATCH v7 1/9] iommu: Introduce a union to struct iommu_resv_region To: Shameer Kolothum , linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org Cc: linuxarm@huawei.com, lorenzo.pieralisi@arm.com, joro@8bytes.org, robin.murphy@arm.com, will@kernel.org, wanghuiqiang@huawei.com, guohanjun@huawei.com, Sami.Mujawar@arm.com, jon@solid-run.com, eric.auger@redhat.com, yangyicong@huawei.com References: <20210805080724.480-1-shameerali.kolothum.thodi@huawei.com> <20210805080724.480-2-shameerali.kolothum.thodi@huawei.com> From: Steven Price Message-ID: <02a2c1cf-11f2-e3c1-95b5-828ceda88517@arm.com> Date: Fri, 20 Aug 2021 11:22:45 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210805080724.480-2-shameerali.kolothum.thodi@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On 05/08/2021 09:07, Shameer Kolothum wrote: > A union is introduced to struct iommu_resv_region to hold > any firmware specific data. This is in preparation to add > support for IORT RMR reserve regions and the union now holds > the RMR specific information. > > Signed-off-by: Shameer Kolothum > --- > include/linux/iommu.h | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 32d448050bf7..bd0e4641c569 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -114,6 +114,13 @@ enum iommu_resv_type { > IOMMU_RESV_SW_MSI, > }; > > +struct iommu_iort_rmr_data { > +#define IOMMU_RMR_REMAP_PERMITTED (1 << 0) > + u32 flags; > + u32 sid; /* Stream Id associated with RMR entry */ > + void *smmu; /* Associated IORT SMMU node pointer */ > +}; > + > /** > * struct iommu_resv_region - descriptor for a reserved memory region > * @list: Linked list pointers > @@ -121,6 +128,7 @@ enum iommu_resv_type { > * @length: Length of the region in bytes > * @prot: IOMMU Protection flags (READ/WRITE/...) > * @type: Type of the reserved region > + * @rmr: ACPI IORT RMR specific data NIT: This will provoke a kernel-doc warning as the field name in the structure is 'fw_data' not 'rmr' ('rmr being a field of the anonymous union). I've also retested this series on my Juno setup, so feel free to add: Tested-by: Steven Price Thanks, Steve > */ > struct iommu_resv_region { > struct list_head list; > @@ -128,6 +136,9 @@ struct iommu_resv_region { > size_t length; > int prot; > enum iommu_resv_type type; > + union { > + struct iommu_iort_rmr_data rmr; > + } fw_data; > }; > > /** >