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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 9094EC433ED for ; Thu, 13 May 2021 13:48:39 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 1DF75613C7 for ; Thu, 13 May 2021 13:48:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1DF75613C7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Ape/bApG8hKCtkPBAitZjaJLfm61W6JfNBRA1ioo51Y=; b=ipCsf9J5h0otNC2EXQX85DVkH QSo2P++SEBBFcgEySLGy5J5BlkPm9Sk4o0M+q7oYLzhNW6ttmo9gT2tTuVb/3P+MIur2Ge9Uri7SQ MjxwpA9irnDRyEwBRSg7ATXjYtEKhSF8GMQyRBUGnq8d8reVNR1atbrRRUhxOgxmCu4sBhLwhh4c2 dUMnSrm+KdBrQpKYQBlOLYPpx4ypp+IcY8lgMVqHKHlNIONZ+pFmNuyYWtDiKEBq2ztCt4pEpwhBu jRBXeJxL2CU0G/fiTMBZR6OYbSdIz04Bxm8GTq0LMj1yvwoTW5EGAba8lWB7PjCmmaWCyeWwazHhm slbfV9FxA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lhBg9-005eLH-7U; Thu, 13 May 2021 13:47:05 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lhBfm-005eIx-FJ for linux-arm-kernel@desiato.infradead.org; Thu, 13 May 2021 13:46:42 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:CC:To:From:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=LhC7FEfFFueMlo0Oj0z8A9hkVQlZ5ToqeydOvKY+6mU=; b=EZ5P1vl+AIaiFkSZjJQTxuDC9n 0k4MTacQS8aTyMdRDUvFvlOFw8kcxkAiEOtr78YGcFdTTMUdp3YZq7QQQjbWM7sO8fwt658uszxYV MWnXXChgDiESKCSeEpCnPNvQPhKVUngEKSXzCQgZ3CMseSF96+j6C+Ok3o01Pl+Gn87x0yYr7+cU2 e0ezgIEj2kD4OWbOsuGQm+HEBw02SABbP6IwCdtDFG0XQjNmeS2q9d92ie4JkQT9hhR584RGuJwVG pVabm9kR7G65p1eMJeaiaid6wrqbZbHRm5MCTliiqJGoFE/rFFTg+s8dgsLZeREOh7RoHkrs3MZuX Ig7wILng==; Received: from szxga04-in.huawei.com ([45.249.212.190]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lhBfi-00BHqz-W8 for linux-arm-kernel@lists.infradead.org; Thu, 13 May 2021 13:46:41 +0000 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4FgtD86xGHz16Njp; Thu, 13 May 2021 21:43:52 +0800 (CST) Received: from A2006125610.china.huawei.com (10.47.81.63) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.498.0; Thu, 13 May 2021 21:46:27 +0800 From: Shameer Kolothum To: , , CC: , , , , , , , , , , Subject: [PATCH v4 2/8] iommu/dma: Introduce generic helper to retrieve RMR info Date: Thu, 13 May 2021 14:45:44 +0100 Message-ID: <20210513134550.2117-3-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20210513134550.2117-1-shameerali.kolothum.thodi@huawei.com> References: <20210513134550.2117-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.81.63] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210513_064639_378085_2D881774 X-CRM114-Status: GOOD ( 13.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Reserved Memory Regions(RMR) associated with an IOMMU can be described through ACPI IORT tables in systems with devices that require a unity mapping or bypass for those regions. Introduce a generic interface so that IOMMU drivers can retrieve and set up necessary mappings. Signed-off-by: Shameer Kolothum --- drivers/iommu/dma-iommu.c | 33 +++++++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 10 ++++++++++ include/linux/iommu.h | 19 +++++++++++++++++++ 3 files changed, 62 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 7bcdd1205535..674bd8815159 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -193,6 +193,39 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) } EXPORT_SYMBOL(iommu_dma_get_resv_regions); +/** + * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated + * with a given IOMMU + * @iommu_fwnode: fwnode associated with IOMMU + * @list: RMR list to be populated + * + */ +int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ + return -EINVAL; +} +EXPORT_SYMBOL(iommu_dma_get_rmrs); + +struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, + u32 flags) +{ + struct iommu_rmr *rmr; + + rmr = kzalloc(sizeof(*rmr), GFP_KERNEL); + if (!rmr) + return NULL; + + INIT_LIST_HEAD(&rmr->list); + rmr->base_address = base; + rmr->length = length; + rmr->sid = sid; + rmr->flags = flags; + + return rmr; +} +EXPORT_SYMBOL(iommu_dma_alloc_rmr); + static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie, phys_addr_t start, phys_addr_t end) { diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 6e75a2d689b4..319f332c279f 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -42,12 +42,17 @@ void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, extern bool iommu_dma_forcedac; +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); +struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, u32 flags); + #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; struct msi_desc; struct msi_msg; struct device; +struct fwnode_handle; +struct iommu_rmr; static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size) @@ -83,5 +88,10 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list) +{ + return -ENODEV; +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */ diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 32d448050bf7..73cd2831cb45 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -555,6 +555,25 @@ struct iommu_sva { struct device *dev; }; +/** + * struct iommu_rmr - Reserved Memory Region details per IOMMU + * @list: Linked list pointers to hold RMR region info + * @base_address: base address of Reserved Memory Region + * @length: length of memory region + * @sid: associated stream id + * @flags: flags that apply to the RMR node + */ +struct iommu_rmr { + struct list_head list; + phys_addr_t base_address; + u64 length; + u32 sid; + u32 flags; +}; + +/* RMR Remap permitted */ +#define IOMMU_RMR_REMAP_PERMITTED (1 << 0) + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops); void iommu_fwspec_free(struct device *dev); -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel