From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751676AbdG0PKu (ORCPT ); Thu, 27 Jul 2017 11:10:50 -0400 Received: from foss.arm.com ([217.140.101.70]:48092 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751452AbdG0PKs (ORCPT ); Thu, 27 Jul 2017 11:10:48 -0400 From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, will.deacon@arm.com, marc.zyngier@arm.com, mark.rutland@arm.com, sudeep.holla@arm.com, mathieu.poirier@linaro.org, Jonathan.Cameron@huawei.com, Suzuki K Poulose , Rob Herring 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> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 */ -- 2.7.5