From patchwork Mon Jul 24 12:46:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13324617 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32646C04A94 for ; Mon, 24 Jul 2023 12:51:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231279AbjGXMv2 (ORCPT ); Mon, 24 Jul 2023 08:51:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37844 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231345AbjGXMum (ORCPT ); Mon, 24 Jul 2023 08:50:42 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3A6F421C; Mon, 24 Jul 2023 05:49:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EA3B56115B; Mon, 24 Jul 2023 12:48:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 877F2C433C7; Mon, 24 Jul 2023 12:48:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690202916; bh=ggfCgbEg0UE7JP5CH6e+dKjRf0SerXD/ltcRHcZOEeI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ZlYyKGx5oVvOMCsNxuqZ4HRF3rvaY0YwGG/oWgFTRzMKYrJMGtgwu7klWTg/EK2OE V+/0x7bthpwL6TZG1IMfBvVdYiFaEV30QTzmWrxcjYn3siUcHaSDiKkiFhafOqS5kF KoInIffQYumzNVhO706WkQSEXJmNPwh4BhncyG0CzIl4dGOcCu7mtPzJNRHdzwM8b5 BbTQ3rNcw+mGsmVl6Q5KHJw0s/435ijNB+0xM6dH3UnyLUCP5fA6LusN2Zxv+CEMRI YSFb+SNJDDbU/0qkGLO5CYwAV8V41dUFmpoUcqULYew038wwhOQp5ontiNxuhh18tE Z+Z0FQcxKgWmQ== From: Mark Brown Date: Mon, 24 Jul 2023 13:46:02 +0100 Subject: [PATCH v2 15/35] arm64/hwcap: Add hwcap for GCS MIME-Version: 1.0 Message-Id: <20230724-arm64-gcs-v2-15-dc2c1d44c2eb@kernel.org> References: <20230724-arm64-gcs-v2-0-dc2c1d44c2eb@kernel.org> In-Reply-To: <20230724-arm64-gcs-v2-0-dc2c1d44c2eb@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.13-dev-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=3001; i=broonie@kernel.org; h=from:subject:message-id; bh=ggfCgbEg0UE7JP5CH6e+dKjRf0SerXD/ltcRHcZOEeI=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBkvnKcknfKTRZzzz9LbJqgRRYQvQPCXo2LJwyJ51fr V9bqvnyJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZL5ynAAKCRAk1otyXVSH0FxjB/ 9s5qbeKLsQo6cJg7CW6iKQsH0m1MonkUJ29aRZgGkImNaZqMPwNq2aDasRT9454sPPGfQ+G/Ygvzf1 S1QuaQjU5/GeTtiG2vHwVUPCzlbr8nVVSyjQDRMaTJCXI8BaVrrtIdPwuNyIKnVw4z8W8Z8GBenp84 jF72SJGd1juVuSEimlfH/nM9iNkZaGToXORIeQxqIjLBvmszrlgTD0NQ9YvnGDCrd36rmFTXUUq0ke m3HYgcLS3kSgZ5RTJ+hlrvMovehLpCDaPmVKV6T0KUMptoJ8603pXErRs8N4yHdel5aNMcBHcgLiV0 utMsK9B0MA0Eq6XGMZGJQyyk7JTwjO X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Provide a hwcap to enable userspace to detect support for GCS. Signed-off-by: Mark Brown --- Documentation/arch/arm64/elf_hwcaps.rst | 3 +++ arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 3 +++ arch/arm64/kernel/cpuinfo.c | 1 + 5 files changed, 9 insertions(+) diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst index 8c8addb4194c..75f3960cad39 100644 --- a/Documentation/arch/arm64/elf_hwcaps.rst +++ b/Documentation/arch/arm64/elf_hwcaps.rst @@ -305,6 +305,9 @@ HWCAP2_SMEF16F16 HWCAP2_MOPS Functionality implied by ID_AA64ISAR2_EL1.MOPS == 0b0001. +HWCAP2_GCS + Functionality implied by ID_AA64PFR1_EL1.GCS == 0b1 + 4. Unused AT_HWCAP bits ----------------------- diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 692b1ec663b2..39f397a2b5b2 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -138,6 +138,7 @@ #define KERNEL_HWCAP_SME_B16B16 __khwcap2_feature(SME_B16B16) #define KERNEL_HWCAP_SME_F16F16 __khwcap2_feature(SME_F16F16) #define KERNEL_HWCAP_MOPS __khwcap2_feature(MOPS) +#define KERNEL_HWCAP_GCS __khwcap2_feature(GCS) /* * This yields a mask that user programs can use to figure out what diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index a2cac4305b1e..7510c35e6864 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -103,5 +103,6 @@ #define HWCAP2_SME_B16B16 (1UL << 41) #define HWCAP2_SME_F16F16 (1UL << 42) #define HWCAP2_MOPS (1UL << 43) +#define HWCAP2_GCS (1UL << 44) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 91a14a6ccb04..7b46e01140c4 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2840,6 +2840,9 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { HWCAP_CAP(ID_AA64ZFR0_EL1, I8MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEI8MM), HWCAP_CAP(ID_AA64ZFR0_EL1, F32MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF32MM), HWCAP_CAP(ID_AA64ZFR0_EL1, F64MM, IMP, CAP_HWCAP, KERNEL_HWCAP_SVEF64MM), +#endif +#ifdef CONFIG_ARM64_GCS + HWCAP_CAP(ID_AA64PFR1_EL1, GCS, IMP, CAP_HWCAP, KERNEL_HWCAP_GCS), #endif HWCAP_CAP(ID_AA64PFR1_EL1, SSBS, SSBS2, CAP_HWCAP, KERNEL_HWCAP_SSBS), #ifdef CONFIG_ARM64_BTI diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 58622dc85917..451fbbeffa39 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -126,6 +126,7 @@ static const char *const hwcap_str[] = { [KERNEL_HWCAP_SME_B16B16] = "smeb16b16", [KERNEL_HWCAP_SME_F16F16] = "smef16f16", [KERNEL_HWCAP_MOPS] = "mops", + [KERNEL_HWCAP_GCS] = "gcs", }; #ifdef CONFIG_COMPAT