From patchwork Tue Apr 7 18:37:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 11478663 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0BA311392 for ; Tue, 7 Apr 2020 18:39:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 DD2582076E for ; Tue, 7 Apr 2020 18:39:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="AIHlKkV6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD2582076E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org 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=6Hh82lM64gWN5mLS810505Tuy5TI6xmEfgUtFm2K42Q=; b=AIHlKkV65lwbyx5Xo4ZCXG7zHQ rpNVzLB2hgYdnirOsBoGqhCbeqy7f6eD/YOAlEzYCN/2BMTax0/vCrgLjOxHY1tSRGDbe/c173XkM iBGjQiPLdillIJz9fKeYkGT2vkO04NZv50PwvW3HcDqhedsmOtrfHqGOB2MysUFXYiGi6I9I6IP50 X50qMlUQzETg6s/2XBnjk+5UcUSPooj9J/oFyUOj7/m7f3kkGH4HlYej8mgI8OJtTx5J5SBuU8GVx BhmXsnmUoKBS7gqv1tAlfdxEVHItJwIwufrdCIyC79RaXBIfq4v0BMLajydbTeSnTwTFU/C1IHKfW rcgmfhZA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jLt7l-0007no-2N; Tue, 07 Apr 2020 18:39:01 +0000 Received: from 8bytes.org ([81.169.241.247] helo=theia.8bytes.org) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jLt6r-0006jt-CC; Tue, 07 Apr 2020 18:38:10 +0000 Received: by theia.8bytes.org (Postfix, from userid 1000) id DA73D455; Tue, 7 Apr 2020 20:37:50 +0200 (CEST) From: Joerg Roedel To: Joerg Roedel , Will Deacon , Robin Murphy , Marek Szyprowski , Kukjin Kim , Krzysztof Kozlowski , David Woodhouse , Lu Baolu , Andy Gross , Bjorn Andersson , Matthias Brugger , Rob Clark , Heiko Stuebner , Gerald Schaefer , Thierry Reding , Jonathan Hunter , Jean-Philippe Brucker Subject: [RFC PATCH 13/34] iommu: Export bus_iommu_probe() and make is safe for re-probing Date: Tue, 7 Apr 2020 20:37:21 +0200 Message-Id: <20200407183742.4344-14-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200407183742.4344-1-joro@8bytes.org> References: <20200407183742.4344-1-joro@8bytes.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200407_113805_589349_813F8BCF X-CRM114-Status: GOOD ( 13.63 ) X-Spam-Score: -0.0 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [81.169.241.247 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-rockchip@lists.infradead.org, iommu@lists.linux-foundation.org, Joerg Roedel , linux-mediatek@lists.infradead.org, linux-tegra@vger.kernel.org MIME-Version: 1.0 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org From: Joerg Roedel Add a check to the bus_iommu_probe() call-path to make sure it ignores devices which have already been successfully probed. Then export the bus_iommu_probe() function so it can be used by IOMMU drivers. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 6 +++++- include/linux/iommu.h | 1 + 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 844613850595..cf25c1e48830 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1615,6 +1615,10 @@ static int probe_iommu_group(struct device *dev, void *data) if (!dev_iommu_get(dev)) return -ENOMEM; + /* Device is probed already if in a group */ + if (iommu_group_get(dev) != NULL) + return 0; + if (!try_module_get(ops->owner)) { ret = -EINVAL; goto err_free_dev_iommu; @@ -1783,7 +1787,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group) iommu_do_create_direct_mappings); } -static int bus_iommu_probe(struct bus_type *bus) +int bus_iommu_probe(struct bus_type *bus) { const struct iommu_ops *ops = bus->iommu_ops; int ret; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 30170d191e5e..fea1622408ad 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -445,6 +445,7 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather) #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */ extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops); +extern int bus_iommu_probe(struct bus_type *bus); extern bool iommu_present(struct bus_type *bus); extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap); extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);