From patchwork Wed Sep 16 14:21:01 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: 7195911 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 651A7BEEC1 for ; Wed, 16 Sep 2015 14:45:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 50DCF2086D for ; Wed, 16 Sep 2015 14:45:11 +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 2A51A2086B for ; Wed, 16 Sep 2015 14:45:10 +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 1ZcDva-0007iS-Vs; Wed, 16 Sep 2015 14:43:19 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZcDv1-0006Qt-QS for linux-arm-kernel@bombadil.infradead.org; Wed, 16 Sep 2015 14:42:44 +0000 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZcDeE-0001FH-EF 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-5-YSXGoAzkTFOI3sFFedwbHg-3; Wed, 16 Sep 2015 15:23:05 +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 15:23:03 +0100 From: "Suzuki K. Poulose" To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 03/22] arm64: Move cpu feature detection code Date: Wed, 16 Sep 2015 15:21:01 +0100 Message-Id: <1442413280-31885-4-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 14:23:03.0662 (UTC) FILETIME=[32C4C0E0:01D0F08B] X-MC-Unique: YSXGoAzkTFOI3sFFedwbHg-3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150916_152522_534752_33E71A3A X-CRM114-Status: GOOD ( 13.59 ) 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" This patch moves the CPU feature detection code from arch/arm64/kernel/{setup.c to cpufeature.c} The plan is to consolidate all the CPU feature handling in cpufeature.c. Changes pr_fmt from "alternatives" to "cpu features" Signed-off-by: Suzuki K. Poulose --- arch/arm64/kernel/cpufeature.c | 111 +++++++++++++++++++++++++++++++++++++++- arch/arm64/kernel/setup.c | 107 -------------------------------------- 2 files changed, 110 insertions(+), 108 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 3c9aed3..bdb3eb4 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -16,13 +16,31 @@ * along with this program. If not, see . */ -#define pr_fmt(fmt) "alternatives: " fmt +#define pr_fmt(fmt) "CPU features: " fmt #include #include #include #include +unsigned long elf_hwcap __read_mostly; +EXPORT_SYMBOL_GPL(elf_hwcap); + +#ifdef CONFIG_COMPAT +#define COMPAT_ELF_HWCAP_DEFAULT \ + (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ + COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ + COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ + COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ + COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\ + COMPAT_HWCAP_LPAE) +unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; +unsigned int compat_elf_hwcap2 __read_mostly; +#endif + +DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); + + static bool feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) { @@ -100,3 +118,94 @@ void check_local_cpu_features(void) { check_cpu_capabilities(arm64_features, "detected feature:"); } + +void __init setup_cpu_features(void) +{ + u64 features; + s64 block; + u32 cwg; + int cls; + + /* + * Check for sane CTR_EL0.CWG value. + */ + cwg = cache_type_cwg(); + cls = cache_line_size(); + if (!cwg) + pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n", + cls); + if (L1_CACHE_BYTES < cls) + pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n", + L1_CACHE_BYTES, cls); + + /* + * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks. + * The blocks we test below represent incremental functionality + * for non-negative values. Negative values are reserved. + */ + features = read_cpuid(ID_AA64ISAR0_EL1); + block = cpuid_feature_extract_field(features, 4); + if (block > 0) { + switch (block) { + default: + case 2: + elf_hwcap |= HWCAP_PMULL; + case 1: + elf_hwcap |= HWCAP_AES; + case 0: + break; + } + } + + if (cpuid_feature_extract_field(features, 8) > 0) + elf_hwcap |= HWCAP_SHA1; + + if (cpuid_feature_extract_field(features, 12) > 0) + elf_hwcap |= HWCAP_SHA2; + + if (cpuid_feature_extract_field(features, 16) > 0) + elf_hwcap |= HWCAP_CRC32; + + block = cpuid_feature_extract_field(features, 20); + if (block > 0) { + switch (block) { + default: + case 2: + elf_hwcap |= HWCAP_ATOMICS; + case 1: + /* RESERVED */ + case 0: + break; + } + } + +#ifdef CONFIG_COMPAT + /* + * ID_ISAR5_EL1 carries similar information as above, but pertaining to + * the AArch32 32-bit execution state. + */ + features = read_cpuid(ID_ISAR5_EL1); + block = cpuid_feature_extract_field(features, 4); + if (block > 0) { + switch (block) { + default: + case 2: + compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL; + case 1: + compat_elf_hwcap2 |= COMPAT_HWCAP2_AES; + case 0: + break; + } + } + + if (cpuid_feature_extract_field(features, 8) > 0) + compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1; + + if (cpuid_feature_extract_field(features, 12) > 0) + compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2; + + if (cpuid_feature_extract_field(features, 16) > 0) + compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32; +#endif +} + diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index d149c18..4c7bca8 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -64,23 +64,6 @@ #include #include -unsigned long elf_hwcap __read_mostly; -EXPORT_SYMBOL_GPL(elf_hwcap); - -#ifdef CONFIG_COMPAT -#define COMPAT_ELF_HWCAP_DEFAULT \ - (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ - COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ - COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ - COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ - COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\ - COMPAT_HWCAP_LPAE) -unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; -unsigned int compat_elf_hwcap2 __read_mostly; -#endif - -DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); - phys_addr_t __fdt_pointer __initdata; /* @@ -195,96 +178,6 @@ static void __init smp_build_mpidr_hash(void) __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash)); } -void __init setup_cpu_features(void) -{ - u64 features; - s64 block; - u32 cwg; - int cls; - - /* - * Check for sane CTR_EL0.CWG value. - */ - cwg = cache_type_cwg(); - cls = cache_line_size(); - if (!cwg) - pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n", - cls); - if (L1_CACHE_BYTES < cls) - pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n", - L1_CACHE_BYTES, cls); - - /* - * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks. - * The blocks we test below represent incremental functionality - * for non-negative values. Negative values are reserved. - */ - features = read_cpuid(ID_AA64ISAR0_EL1); - block = cpuid_feature_extract_field(features, 4); - if (block > 0) { - switch (block) { - default: - case 2: - elf_hwcap |= HWCAP_PMULL; - case 1: - elf_hwcap |= HWCAP_AES; - case 0: - break; - } - } - - if (cpuid_feature_extract_field(features, 8) > 0) - elf_hwcap |= HWCAP_SHA1; - - if (cpuid_feature_extract_field(features, 12) > 0) - elf_hwcap |= HWCAP_SHA2; - - if (cpuid_feature_extract_field(features, 16) > 0) - elf_hwcap |= HWCAP_CRC32; - - block = cpuid_feature_extract_field(features, 20); - if (block > 0) { - switch (block) { - default: - case 2: - elf_hwcap |= HWCAP_ATOMICS; - case 1: - /* RESERVED */ - case 0: - break; - } - } - -#ifdef CONFIG_COMPAT - /* - * ID_ISAR5_EL1 carries similar information as above, but pertaining to - * the AArch32 32-bit execution state. - */ - features = read_cpuid(ID_ISAR5_EL1); - block = cpuid_feature_extract_field(features, 4); - if (block > 0) { - switch (block) { - default: - case 2: - compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL; - case 1: - compat_elf_hwcap2 |= COMPAT_HWCAP2_AES; - case 0: - break; - } - } - - if (cpuid_feature_extract_field(features, 8) > 0) - compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1; - - if (cpuid_feature_extract_field(features, 12) > 0) - compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2; - - if (cpuid_feature_extract_field(features, 16) > 0) - compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32; -#endif -} - static void __init setup_processor(void) { pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());