From patchwork Wed Jan 24 10:35:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffy Chen X-Patchwork-Id: 10182071 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 46DF2602B7 for ; Wed, 24 Jan 2018 10:38:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4E7A9223B2 for ; Wed, 24 Jan 2018 10:38:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 43647288C3; Wed, 24 Jan 2018 10:38:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A8DBA223B2 for ; Wed, 24 Jan 2018 10:38:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=9J4g6Ckw6OkU/vKG/Tbu5P9PP1z+qwh8ELWMFOOd3hE=; b=Ai229CmN9GdskHLH28almxvhtT SZrEobvqsKntSV6wmqhPnzp3b3yw5MPJLydltWM9XAuspw2qpLeN34ErFSY8J2JLMTH+Ft1XrPbW4 d3VFgInyn6GRkLwZz4P5gOsqIC33hgCo7Vp7Lv9oCA2ZJb0/1zHH731wWx4Gz4XzRuJ7jAtg8jFei xLa0vMy/UtfqRuEEz6Szcv738F7WVKL2IETv6ZjO8PiGfTh6YA5xfGSt6c8r1BIwIpccwtYw2WoVT tNoI4ChTDr1jDn1byHSvVbq3VzDldcE5e+7BHudo2q4TK55IxejW4iLHLc+BVBXT9B3fcvK+Wvcel +IlQLB8g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1eeIRd-0008GS-J1; Wed, 24 Jan 2018 10:38:17 +0000 Received: from regular1.263xmail.com ([211.150.99.130]) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1eeIQT-0006y8-9a; Wed, 24 Jan 2018 10:37:18 +0000 Received: from jeffy.chen?rock-chips.com (unknown [192.168.167.13]) by regular1.263xmail.com (Postfix) with ESMTP id 55FD8B1AA; Wed, 24 Jan 2018 18:36:50 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTPA id BB998369; Wed, 24 Jan 2018 18:36:48 +0800 (CST) X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-kernel@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: <92b032339bc0c81e66ef0171ff98204e> X-ATTACHMENT-NUM: 0 X-SENDER: cjf@rock-chips.com X-DNS-TYPE: 0 Received: from localhost (unknown [103.29.142.67]) by smtp.263.net (Postfix) whith ESMTP id 14811QEQU9H; Wed, 24 Jan 2018 18:36:51 +0800 (CST) From: Jeffy Chen To: linux-kernel@vger.kernel.org Subject: [PATCH v5 10/13] iommu/rockchip: Use OF_IOMMU to attach devices automatically Date: Wed, 24 Jan 2018 18:35:13 +0800 Message-Id: <20180124103516.2571-11-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180124103516.2571-1-jeffy.chen@rock-chips.com> References: <20180124103516.2571-1-jeffy.chen@rock-chips.com> X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xxm@rock-chips.com, Joerg Roedel , Jeffy Chen , tfiga@chromium.org, jcliang@chromium.org, linux-rockchip@lists.infradead.org, iommu@lists.linux-foundation.org, robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org, Heiko Stuebner MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Converts the rockchip-iommu driver to use the OF_IOMMU infrastructure, which allows attaching master devices to their IOMMUs automatically according to DT properties. Signed-off-by: Jeffy Chen Reviewed-by: Robin Murphy --- Changes in v5: None Changes in v4: None Changes in v3: Add struct rk_iommudata. Squash iommu/rockchip: Use iommu_group_get_for_dev() for add_device Changes in v2: None drivers/iommu/rockchip-iommu.c | 135 ++++++++++++----------------------------- 1 file changed, 40 insertions(+), 95 deletions(-) diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index e545b3f252a6..faebb6dd1f69 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -99,6 +100,10 @@ struct rk_iommu { struct iommu_domain *domain; /* domain to which iommu is attached */ }; +struct rk_iommudata { + struct rk_iommu *iommu; +}; + static struct device *dma_dev; static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma, @@ -834,18 +839,9 @@ static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova, static struct rk_iommu *rk_iommu_from_dev(struct device *dev) { - struct iommu_group *group; - struct device *iommu_dev; - struct rk_iommu *rk_iommu; + struct rk_iommudata *data = dev->archdata.iommu; - group = iommu_group_get(dev); - if (!group) - return NULL; - iommu_dev = iommu_group_get_iommudata(group); - rk_iommu = dev_get_drvdata(iommu_dev); - iommu_group_put(group); - - return rk_iommu; + return data ? data->iommu : NULL; } static int rk_iommu_attach_device(struct iommu_domain *domain, @@ -1016,110 +1012,53 @@ static void rk_iommu_domain_free(struct iommu_domain *domain) iommu_put_dma_cookie(&rk_domain->domain); } -static bool rk_iommu_is_dev_iommu_master(struct device *dev) -{ - struct device_node *np = dev->of_node; - int ret; - - /* - * An iommu master has an iommus property containing a list of phandles - * to iommu nodes, each with an #iommu-cells property with value 0. - */ - ret = of_count_phandle_with_args(np, "iommus", "#iommu-cells"); - return (ret > 0); -} - -static int rk_iommu_group_set_iommudata(struct iommu_group *group, - struct device *dev) +static int rk_iommu_add_device(struct device *dev) { - struct device_node *np = dev->of_node; - struct platform_device *pd; - int ret; - struct of_phandle_args args; + struct iommu_group *group; + struct rk_iommu *iommu; - /* - * An iommu master has an iommus property containing a list of phandles - * to iommu nodes, each with an #iommu-cells property with value 0. - */ - ret = of_parse_phandle_with_args(np, "iommus", "#iommu-cells", 0, - &args); - if (ret) { - dev_err(dev, "of_parse_phandle_with_args(%pOF) => %d\n", - np, ret); - return ret; - } - if (args.args_count != 0) { - dev_err(dev, "incorrect number of iommu params found for %pOF (found %d, expected 0)\n", - args.np, args.args_count); - return -EINVAL; - } + iommu = rk_iommu_from_dev(dev); + if (!iommu) + return -ENODEV; - pd = of_find_device_by_node(args.np); - of_node_put(args.np); - if (!pd) { - dev_err(dev, "iommu %pOF not found\n", args.np); - return -EPROBE_DEFER; - } + group = iommu_group_get_for_dev(dev); + if (IS_ERR(group)) + return PTR_ERR(group); + iommu_group_put(group); - /* TODO(djkurtz): handle multiple slave iommus for a single master */ - iommu_group_set_iommudata(group, &pd->dev, NULL); + iommu_device_link(&iommu->iommu, dev); return 0; } -static int rk_iommu_add_device(struct device *dev) +static void rk_iommu_remove_device(struct device *dev) { - struct iommu_group *group; struct rk_iommu *iommu; - int ret; - - if (!rk_iommu_is_dev_iommu_master(dev)) - return -ENODEV; - - group = iommu_group_get(dev); - if (!group) { - group = iommu_group_alloc(); - if (IS_ERR(group)) { - dev_err(dev, "Failed to allocate IOMMU group\n"); - return PTR_ERR(group); - } - } - - ret = iommu_group_add_device(group, dev); - if (ret) - goto err_put_group; - - ret = rk_iommu_group_set_iommudata(group, dev); - if (ret) - goto err_remove_device; iommu = rk_iommu_from_dev(dev); - if (iommu) - iommu_device_link(&iommu->iommu, dev); - iommu_group_put(group); - - return 0; - -err_remove_device: + iommu_device_unlink(&iommu->iommu, dev); iommu_group_remove_device(dev); -err_put_group: - iommu_group_put(group); - return ret; } -static void rk_iommu_remove_device(struct device *dev) +static int rk_iommu_of_xlate(struct device *dev, + struct of_phandle_args *args) { - struct rk_iommu *iommu; + struct platform_device *iommu_dev; + struct rk_iommudata *data; - if (!rk_iommu_is_dev_iommu_master(dev)) - return; + data = devm_kzalloc(dma_dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; - iommu = rk_iommu_from_dev(dev); - if (iommu) - iommu_device_unlink(&iommu->iommu, dev); + iommu_dev = of_find_device_by_node(args->np); - iommu_group_remove_device(dev); + data->iommu = platform_get_drvdata(iommu_dev); + dev->archdata.iommu = data; + + of_dev_put(iommu_dev); + + return 0; } static const struct iommu_ops rk_iommu_ops = { @@ -1133,7 +1072,9 @@ static const struct iommu_ops rk_iommu_ops = { .add_device = rk_iommu_add_device, .remove_device = rk_iommu_remove_device, .iova_to_phys = rk_iommu_iova_to_phys, + .device_group = generic_device_group, .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP, + .of_xlate = rk_iommu_of_xlate, }; static int rk_iommu_probe(struct platform_device *pdev) @@ -1196,6 +1137,8 @@ static int rk_iommu_probe(struct platform_device *pdev) goto err_unprepare_clocks; iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops); + iommu_device_set_fwnode(&iommu->iommu, &dev->of_node->fwnode); + err = iommu_device_register(&iommu->iommu); if (err) goto err_remove_sysfs; @@ -1252,6 +1195,8 @@ static int __init rk_iommu_init(void) } subsys_initcall(rk_iommu_init); +IOMMU_OF_DECLARE(rk_iommu_of, "rockchip,iommu"); + MODULE_DESCRIPTION("IOMMU API for Rockchip"); MODULE_AUTHOR("Simon Xue and Daniel Kurtz "); MODULE_ALIAS("platform:rockchip-iommu");