From patchwork Thu Jul 27 15:10:14 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 9867097 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 0171160382 for ; Thu, 27 Jul 2017 15:11:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E74FC28735 for ; Thu, 27 Jul 2017 15:11:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DC52F28758; Thu, 27 Jul 2017 15:11:26 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE 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 2B14228770 for ; Thu, 27 Jul 2017 15:11:25 +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=h6gnFmSTy3zQHjSSstAWSq9y/Jy5I0bghveHxpMzyQ8=; b=uz++tirtmJEz12ixY+tzHT7V2k xesJLDnMQYW7769Xo9ZjECW4f60WVegFjFHd8MYP0Hg+sc0edIwI5S0gqrnkfS2FJl1vaJhRhnOVZ +BXPTCWcOIVtACM7pNWqSrtwiPkRvwNeh+NWkPe9aGOSbr5co8YsIPxQUB6+LZyZqrbv7jJC08FRf n2BL+X1CLDX5DXaNWJ1oys6LU9/VEBf6r5E/5u6YtAFLSQU6tSOf/Vz2rzr9Pydf6Z7QGkhdW2jAP OcXkROKVzF8ggno3OS07BMKYRs1JPod7kYhYfYcqRZwgFpTtkOO+u5x1HYO0WSMnsgUddfFuVlCAq 6hTFm8/w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dakRe-0000s3-5g; Thu, 27 Jul 2017 15:11:22 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dakRM-0000cy-Qt for linux-arm-kernel@lists.infradead.org; Thu, 27 Jul 2017 15:11:06 +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 2E39915AD; Thu, 27 Jul 2017 08:10:48 -0700 (PDT) Received: from e107814-lin.cambridge.arm.com (e107814-lin.cambridge.arm.com [10.1.206.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 853C93F577; Thu, 27 Jul 2017 08:10:46 -0700 (PDT) From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 2/6] of: Add helper for mapping device node to logical CPU number Date: Thu, 27 Jul 2017 16:10:14 +0100 Message-Id: <1501168218-26741-3-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.7.5 In-Reply-To: <1501168218-26741-1-git-send-email-suzuki.poulose@arm.com> References: <1501168218-26741-1-git-send-email-suzuki.poulose@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170727_081104_896440_72769B13 X-CRM114-Status: GOOD ( 12.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, mathieu.poirier@linaro.org, Suzuki K Poulose , marc.zyngier@arm.com, Jonathan.Cameron@huawei.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, Rob Herring , sudeep.holla@arm.com 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 Add a helper to map a device node to a logical CPU number to avoid duplication. Currently this is open coded in different places (e.g gic-v3, coresight). The helper tries to map device node to a "possible" logical CPU id, which may not be online yet. It is the responsibility of the user to make sure that the CPU is online. The helper uses of_get_cpu_node() which uses arch specific backends to match the phyiscal ids. Cc: Rob Herring Cc: Mark Rutland Cc: Sudeep Holla Reviewed-by: Marc Zyngier Signed-off-by: Suzuki K Poulose --- drivers/of/base.c | 26 ++++++++++++++++++++++++++ include/linux/of_device.h | 7 +++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 686628d..0b01515 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -420,6 +420,32 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) EXPORT_SYMBOL(of_get_cpu_node); /** + * of_device_node_get_cpu: Get the logical CPU number for a given device_node + * + * @cpu_node: Pointer to the device_node for CPU. + * + * Returns the logical CPU number of the given CPU device_node. + * Returns >= nr_cpu_ids if CPU is not found. + */ +int of_device_node_get_cpu(struct device_node *cpu_node) +{ + int cpu; + bool found = false; + struct device_node *np; + + for_each_possible_cpu(cpu) { + np = of_get_cpu_node(cpu, NULL); + found = (cpu_node == np); + of_node_put(np); + if (found) + break; + } + + return cpu; +} +EXPORT_SYMBOL(of_device_node_get_cpu); + +/** * __of_device_is_compatible() - Check if the node matches given constraints * @device: pointer to node * @compat: required compatible string, NULL or "" for any match diff --git a/include/linux/of_device.h b/include/linux/of_device.h index b4ad8b4..00a4ba9 100644 --- a/include/linux/of_device.h +++ b/include/linux/of_device.h @@ -40,6 +40,8 @@ extern int of_device_request_module(struct device *dev); extern void of_device_uevent(struct device *dev, struct kobj_uevent_env *env); extern int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env); +extern int of_device_node_get_cpu(struct device_node *np); + static inline void of_device_node_put(struct device *dev) { of_node_put(dev->of_node); @@ -110,6 +112,11 @@ static inline int of_dma_configure(struct device *dev, struct device_node *np) } static inline void of_dma_deconfigure(struct device *dev) {} + +static inline int of_device_node_get_cpu(struct device_node *np) +{ + return nr_cpu_ids; +} #endif /* CONFIG_OF */ #endif /* _LINUX_OF_DEVICE_H */