From patchwork Fri Jul 24 09:43:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 6858771 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 7E8A2C05AC for ; Fri, 24 Jul 2015 09:49:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B63F020421 for ; Fri, 24 Jul 2015 09:49:17 +0000 (UTC) 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.kernel.org (Postfix) with ESMTPS id E6F1720609 for ; Fri, 24 Jul 2015 09:49:16 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZIZZa-00051t-QV; Fri, 24 Jul 2015 09:47:22 +0000 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZIZXT-0001mG-2W for linux-arm-kernel@lists.infradead.org; Fri, 24 Jul 2015 09:45:16 +0000 Received: from cam-owa1.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.140]) by eu-smtp-1.mimecast.com with ESMTP id uk-mta-2-So6tjK0LTsuoRd3eSMOMIg-9; Fri, 24 Jul 2015 10:44:44 +0100 Received: from e106634-lin.cambridge.arm.com ([10.1.2.79]) by cam-owa1.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 24 Jul 2015 10:44:42 +0100 From: "Suzuki K. Poulose" To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 09/10] arm64: Read system wide CPUID value Date: Fri, 24 Jul 2015 10:43:55 +0100 Message-Id: <1437731037-25795-10-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1437731037-25795-1-git-send-email-suzuki.poulose@arm.com> References: <1437731037-25795-1-git-send-email-suzuki.poulose@arm.com> X-OriginalArrivalTime: 24 Jul 2015 09:44:42.0839 (UTC) FILETIME=[5DFEE670:01D0C5F5] X-MC-Unique: So6tjK0LTsuoRd3eSMOMIg-9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150724_024511_815218_0692D4A5 X-CRM114-Status: UNSURE ( 7.65 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -4.2 (----) 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: mark.rutland@arm.com, "Suzuki K. Poulose" , aph@redhat.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, edward.nevill@linaro.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Suzuki K. Poulose" Add an API for reading a safe CPUID value across the system Signed-off-by: Suzuki K. Poulose --- arch/arm64/include/asm/cpu.h | 2 ++ arch/arm64/kernel/cpuinfo.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index cb25cb9..17a871d 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -177,6 +177,7 @@ struct arm64_ftr_reg { .ftr_bits = &((ftr_table)[0]), \ } +#define read_system_cpuid(id) read_system_reg(SYS_##id) /* * Records attributes of an individual CPU. */ @@ -226,4 +227,5 @@ static inline u64 arm64_ftr_value(struct arm64_ftr_bits *ftrp, u64 reg) return ((reg >> ftrp->shift) & ftrp->mask); } +u64 read_system_reg(enum sys_id id); #endif /* __ASM_CPU_H */ diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 9145eef..7d140f7 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -310,6 +310,15 @@ static struct arm64_ftr_reg* get_arm64_sys_reg(enum sys_id sys_id) return NULL; } +u64 read_system_reg(enum sys_id id) +{ + struct arm64_ftr_reg *regp = get_arm64_sys_reg(id); + + /* We shouldn't get a request for an unsupported register */ + BUG_ON(!regp); + return regp->sys_val; +} + static u64 arm64_ftr_set_value(struct arm64_ftr_bits *ftrp, u64 reg, u64 ftr_val) { u64 mask = ftrp->mask << ftrp->shift;