From patchwork Mon Aug 15 15:23:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9281339 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 A6F49607FD for ; Mon, 15 Aug 2016 15:25:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9792328D26 for ; Mon, 15 Aug 2016 15:25:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8BBCE28D2A; Mon, 15 Aug 2016 15:25:55 +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, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 59DD728D26 for ; Mon, 15 Aug 2016 15:25:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bZJkK-0005WD-8O; Mon, 15 Aug 2016 15:24:12 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bZJkG-0005Sc-6L for linux-arm-kernel@lists.infradead.org; Mon, 15 Aug 2016 15:24:09 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 55800959; Mon, 15 Aug 2016 08:25:21 -0700 (PDT) Received: from red-moon.cambridge.arm.com (red-moon.cambridge.arm.com [10.1.206.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AD8F73F32C; Mon, 15 Aug 2016 08:23:46 -0700 (PDT) From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Subject: [PATCH v4 01/15] drivers: iommu: add FWNODE_IOMMU fwnode type Date: Mon, 15 Aug 2016 16:23:26 +0100 Message-Id: <1471274620-20754-2-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1471274620-20754-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1471274620-20754-1-git-send-email-lorenzo.pieralisi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160815_082408_288861_EE92E479 X-CRM114-Status: GOOD ( 10.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi , Marc Zyngier , "Rafael J. Wysocki" , Joerg Roedel , Will Deacon , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sinan Kaya , linux-acpi@vger.kernel.org, Dennis Chen , Hanjun Guo , Tomasz Nowicki , Nate Watterson , Robin Murphy , Jon Masters MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP On systems booting with a device tree, every struct device is associated with a struct device_node, that represents its DT representation. The device node can be used in generic kernel contexts (eg IRQ translation, IOMMU streamid mapping), to retrieve the properties associated with the device and carry out kernel operation accordingly. Owing to the 1:1 relationship between the device and its device_node, the device_node can also be used as a look-up token for the device (eg looking up a device through its device_node), to retrieve the device in kernel paths where the device_node is available. On systems booting with ACPI, the same abstraction provided by the device_node is required to provide look-up functionality. Therefore, mirroring the approach implemented in the IRQ domain kernel layer, this patch adds an additional fwnode type FWNODE_IOMMU. This patch also implements a glue kernel layer that allows to allocate/free FWNODE_IOMMU fwnode_handle structures and associate them with IOMMU devices. Signed-off-by: Lorenzo Pieralisi Cc: Joerg Roedel Cc: "Rafael J. Wysocki" Reviewed-by: Hanjun Guo --- include/linux/fwnode.h | 1 + include/linux/iommu.h | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 8516717..6e10050 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -19,6 +19,7 @@ enum fwnode_type { FWNODE_ACPI_DATA, FWNODE_PDATA, FWNODE_IRQCHIP, + FWNODE_IOMMU, }; struct fwnode_handle { diff --git a/include/linux/iommu.h b/include/linux/iommu.h index a35fb8b..6f703cb 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -38,6 +38,7 @@ struct bus_type; struct device; struct iommu_domain; struct notifier_block; +struct fwnode_handle; /* iommu fault flags */ #define IOMMU_FAULT_READ 0x0 @@ -543,4 +544,28 @@ static inline void iommu_device_unlink(struct device *dev, struct device *link) #endif /* CONFIG_IOMMU_API */ +/* IOMMU fwnode handling */ +static inline bool is_fwnode_iommu(struct fwnode_handle *fwnode) +{ + return fwnode && fwnode->type == FWNODE_IOMMU; +} + +static inline struct fwnode_handle *iommu_alloc_fwnode(void) +{ + struct fwnode_handle *fwnode; + + fwnode = kzalloc(sizeof(struct fwnode_handle), GFP_ATOMIC); + fwnode->type = FWNODE_IOMMU; + + return fwnode; +} + +static inline void iommu_free_fwnode(struct fwnode_handle *fwnode) +{ + if (WARN_ON(!is_fwnode_iommu(fwnode))) + return; + + kfree(fwnode); +} + #endif /* __LINUX_IOMMU_H */