From patchwork Mon Nov 19 12:45:05 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 1764711 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 00AD03FCAE for ; Mon, 19 Nov 2012 12:49:55 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TaQke-00047o-BQ; Mon, 19 Nov 2012 12:47:00 +0000 Received: from service87.mimecast.com ([91.220.42.44]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TaQj5-0003XR-3k for linux-arm-kernel@lists.infradead.org; Mon, 19 Nov 2012 12:45:25 +0000 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Mon, 19 Nov 2012 12:45:19 +0000 Received: from e102568-lin.cambridge.arm.com ([10.1.255.212]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 19 Nov 2012 12:45:18 +0000 From: Lorenzo Pieralisi To: linux-arm-kernel@lists.infradead.org, devicetree-discuss@lists.ozlabs.org Subject: [PATCH v4 6/7] ARM: kernel: add logical mappings look-up Date: Mon, 19 Nov 2012 12:45:05 +0000 Message-Id: <1353329106-24084-7-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1353329106-24084-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1353329106-24084-1-git-send-email-lorenzo.pieralisi@arm.com> X-OriginalArrivalTime: 19 Nov 2012 12:45:18.0664 (UTC) FILETIME=[BB10D480:01CDC653] X-MC-Unique: 112111912451907901 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121119_074523_617646_3FDD84C9 X-CRM114-Status: GOOD ( 12.33 ) X-Spam-Score: 0.4 (/) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (0.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [91.220.42.44 listed in list.dnswl.org] 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Mark Rutland , Nicolas Pitre , Dave Martin , Lorenzo Pieralisi , Russell King , Pawel Moll , Stephen Warren , Tony Lindgren , Catalin Marinas , Will Deacon , Amit Kucheria , Grant Likely , Kukjin Kim , Rob Herring , Benjamin Herrenschmidt , Vincent Guittot , David Brown , Magnus Damm X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org In ARM SMP systems the MPIDR register ([23:0] bits) is used to uniquely identify CPUs. In order to retrieve the logical CPU index corresponding to a given MPIDR value and guarantee a consistent translation throughout the kernel, this patch adds a look-up based on the MPIDR[23:0] so that kernel subsystems can use it whenever the logical cpu index corresponding to a given MPIDR value is needed. Signed-off-by: Lorenzo Pieralisi Acked-by: Will Deacon Acked-by: Nicolas Pitre --- arch/arm/include/asm/smp_plat.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index 558d6c8..aaa61b6 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -5,6 +5,9 @@ #ifndef __ASMARM_SMP_PLAT_H #define __ASMARM_SMP_PLAT_H +#include +#include + #include /* @@ -48,5 +51,19 @@ static inline int cache_ops_need_broadcast(void) */ extern int __cpu_logical_map[]; #define cpu_logical_map(cpu) __cpu_logical_map[cpu] +/* + * Retrieve logical cpu index corresponding to a given MPIDR[23:0] + * - mpidr: MPIDR[23:0] to be used for the look-up + * + * Returns the cpu logical index or -EINVAL on look-up error + */ +static inline int get_logical_index(u32 mpidr) +{ + int cpu; + for (cpu = 0; cpu < nr_cpu_ids; cpu++) + if (cpu_logical_map(cpu) == mpidr) + return cpu; + return -EINVAL; +} #endif