From patchwork Wed Sep 16 14:21:07 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: 7195651 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 6B209BEEC1 for ; Wed, 16 Sep 2015 14:28:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9170F20875 for ; Wed, 16 Sep 2015 14:28:44 +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 AA42F2086B for ; Wed, 16 Sep 2015 14:28:43 +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 1ZcDfd-00060I-RQ; Wed, 16 Sep 2015 14:26:49 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZcDeJ-0004cv-4k for linux-arm-kernel@bombadil.infradead.org; Wed, 16 Sep 2015 14:25:27 +0000 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]) by merlin.infradead.org with esmtp (Exim 4.85 #2 (Red Hat Linux)) id 1ZcDeF-0004f4-Bq for linux-arm-kernel@lists.infradead.org; Wed, 16 Sep 2015 14:25:25 +0000 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.140]) by eu-smtp-1.mimecast.com with ESMTP id uk-mta-37-I5yHWYAmRv6TwXcRa-Z4yg-5; Wed, 16 Sep 2015 15:23:06 +0100 Received: from e106634-lin.cambridge.arm.com ([10.1.2.79]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 16 Sep 2015 15:23:04 +0100 From: "Suzuki K. Poulose" To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 09/22] arm64: Read system wide CPUID value Date: Wed, 16 Sep 2015 15:21:07 +0100 Message-Id: <1442413280-31885-10-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1442413280-31885-1-git-send-email-suzuki.poulose@arm.com> References: <1442413280-31885-1-git-send-email-suzuki.poulose@arm.com> X-OriginalArrivalTime: 16 Sep 2015 14:23:04.0240 (UTC) FILETIME=[331CF300:01D0F08B] X-MC-Unique: I5yHWYAmRv6TwXcRa-Z4yg-5 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150916_102523_683953_0AD1958C X-CRM114-Status: GOOD ( 10.30 ) 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, ard.biesheuvel@linaro.org, aph@redhat.com, Catalin.Marinas@arm.com, "Suzuki K. Poulose" , Will.Deacon@arm.com, linux-kernel@vger.kernel.org, edward.nevill@linaro.org, andre.przywara@arm.com, marc.zyngier@arm.com, dave.martin@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-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_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 the safe CPUID value across the system from the new infrastructure. Signed-off-by: Suzuki K. Poulose --- arch/arm64/include/asm/cpufeature.h | 2 ++ arch/arm64/kernel/cpufeature.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 7927ac2..f59e90a 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -149,6 +149,8 @@ void check_local_cpu_features(void); bool cpu_supports_mixed_endian_el0(void); bool system_supports_mixed_endian_el0(void); +u64 read_system_reg(u32 id); + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 960a62f..a736c13 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -593,6 +593,15 @@ void update_cpu_features(int cpu, update_mixed_endian_el0_support(info); } +u64 read_system_reg(u32 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 bool feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) {