From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1F263C433F5 for ; Thu, 27 Jan 2022 20:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LnOdvK+tNTbe47ywTjsvXPsHlfYw9EgncIPpmQpt83w=; b=iZHd2+o3lkxNLO Z4EpQ52yrKr7XBBKh1POCCLRyMOYet86ckn2BLVfE6ceYL1FBQjUaWZzBJP+01Rwon6dUYj0Oclu7 ecoJ7xSQk4cQ4oxY/cOi2xX8FBtYKN/ibzY31VimgF+Job1QcpRG4Bf9OqscFkEI393t5qhy4KSO2 nEDkSxRhMVeJwdy0IsF651JkQ9rDWKQur6msK7HAv8jFz/jDqko0tYprmfC9cN3w/bxOioq06TLKz 21QmtckL/vDesmC5f2WC8GfsFMPCa5gaz2376qN3Me9ezsWIU4v2Oj9GmvfMEhWHboATrVBJl/sb/ k/Lr8MaU7N8t5tH+i5FA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDB1s-00H26h-7z; Thu, 27 Jan 2022 20:06:00 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDB1F-00H1yd-Gg for linux-arm-kernel@lists.infradead.org; Thu, 27 Jan 2022 20:05:23 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 107C261826; Thu, 27 Jan 2022 20:05:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14EABC340EC; Thu, 27 Jan 2022 20:05:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643313920; bh=0MrOSulVVzF7wto5kg1kKbYAbWmhw6yP+uQUsGBBlfo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rHpK3bpqYhsBaJer9JzM+MzYxjZIi2y6rGLIeTLraSopnfmKd9ValQCWZPbNedIxF CtrWAfiOxZ9CktVyU2nHFBzWChKFCvCZ2Uy2Jw8bbEwaejTVPKtB2KrQ/MfpGw+aov m8UxQjxlEEjdsVqYUpJiyZG5PYQs4dvGWKGg9zSZCQJ5J0S4uGnW1m7/FISxdAR9lj AkYvEte3UsBCGmmgznNgGRNOjyBFNOoUw6Z/Z1nV/NC/9nUkNw8ehy1FudovmYZJqK u52c+szulhzaaFXjS4CnLfcA94kkmQ7nLdwMcZRbmfPbNmyVpc7IOa+x+LXTTB3N0I zMWVtUsYDexIA== From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Joey Gouly , Branislav Rankov , linux-arm-kernel@lists.infradead.org, Mark Brown Subject: [PATCH v1 3/4] arm64/mte: Add hwcap for asymmetric mode Date: Thu, 27 Jan 2022 19:57:11 +0000 Message-Id: <20220127195712.748150-4-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220127195712.748150-1-broonie@kernel.org> References: <20220127195712.748150-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3103; h=from:subject; bh=0MrOSulVVzF7wto5kg1kKbYAbWmhw6yP+uQUsGBBlfo=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBh8vkWadafNQCGowa63fwLxzsppKTwmKQKYyIe2TbI JV1+Y2SJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYfL5FgAKCRAk1otyXVSH0CEqB/ 9S+q1SkpQ3dWPQKGPMK0MSdfcPrvDlJ7UR8THywzZttrZVDZsTF8A6jayRJmGn8XJfcS+tbOs5aXs6 +oH2xaBteRsbGeBmbmi68kEH0pF18SepKzivNS40GnqHwLvGqWVAdB3PlnPahiG0dsYfYnpmtq/KbX KSUQysZ71U2jv2DK8pr98ZboJ1JbwbgWksrYuyC7Mrke1eM1n7tnLkxXqCTXiHxwLZRET/9qCgXZSE gR0TJXJPtdQ6Nt33dCFRiKHK4WUyAi92MTi2El8XUVEd16ts8m43o0vs85w46J8ETEDP171izrYMyz k/LzbnIr6Vlg7Ffgx3eKlWU6MEEnGL X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220127_120521_699974_2CBB69D2 X-CRM114-Status: GOOD ( 13.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow userspace to detect support for asymmetric mode by providing a hwcap for it, using the official feature name FEAT_MTE3. Signed-off-by: Mark Brown --- Documentation/arm64/elf_hwcaps.rst | 5 +++++ arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 1 + arch/arm64/kernel/cpuinfo.c | 1 + 5 files changed, 9 insertions(+) diff --git a/Documentation/arm64/elf_hwcaps.rst b/Documentation/arm64/elf_hwcaps.rst index b72ff17d600a..a8f30963e550 100644 --- a/Documentation/arm64/elf_hwcaps.rst +++ b/Documentation/arm64/elf_hwcaps.rst @@ -259,6 +259,11 @@ HWCAP2_RPRES Functionality implied by ID_AA64ISAR2_EL1.RPRES == 0b0001. +HWCAP2_MTE3 + + Functionality implied by ID_AA64PFR1_EL1.MTE == 0b0011, as described + by Documentation/arm64/memory-tagging-extension.rst. + 4. Unused AT_HWCAP bits ----------------------- diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index f68fbb207473..8db5ec0089db 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -108,6 +108,7 @@ #define KERNEL_HWCAP_ECV __khwcap2_feature(ECV) #define KERNEL_HWCAP_AFP __khwcap2_feature(AFP) #define KERNEL_HWCAP_RPRES __khwcap2_feature(RPRES) +#define KERNEL_HWCAP_MTE3 __khwcap2_feature(MTE3) /* * 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 f03731847d9d..99cb5d383048 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -78,5 +78,6 @@ #define HWCAP2_ECV (1 << 19) #define HWCAP2_AFP (1 << 20) #define HWCAP2_RPRES (1 << 21) +#define HWCAP2_MTE3 (1 << 22) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index a46ab3b1c4d5..57de3f3e0518 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2485,6 +2485,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { #endif #ifdef CONFIG_ARM64_MTE HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_MTE_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_MTE, CAP_HWCAP, KERNEL_HWCAP_MTE), + HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_MTE_SHIFT, FTR_UNSIGNED, ID_AA64PFR1_MTE_ASYMM, CAP_HWCAP, KERNEL_HWCAP_MTE3), #endif /* CONFIG_ARM64_MTE */ HWCAP_CAP(SYS_ID_AA64MMFR0_EL1, ID_AA64MMFR0_ECV_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ECV), HWCAP_CAP(SYS_ID_AA64MMFR1_EL1, ID_AA64MMFR1_AFP_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AFP), diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 591c18a889a5..330b92ea863a 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -97,6 +97,7 @@ static const char *const hwcap_str[] = { [KERNEL_HWCAP_ECV] = "ecv", [KERNEL_HWCAP_AFP] = "afp", [KERNEL_HWCAP_RPRES] = "rpres", + [KERNEL_HWCAP_MTE3] = "mte3", }; #ifdef CONFIG_COMPAT -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel