From patchwork Wed Jul 6 17:52:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12908447 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 AA17BC433EF for ; Wed, 6 Jul 2022 17:56:33 +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=FR0k59upEhNvrwkcveeT37O25rgOi2aCTYWJYwFOgOU=; b=w/LQDyPXxKa+f6 RDkfCjjhbccS19GBwfKBCHAnrypfs84iS+xxSVeRgCvTF7KHyfMf4OLCfIqjaeb0OaVQqrtzYKWbt 59tenaoE85efiNu4T00FPt2YfatfuOOPzEAvGEJO3xB63zmS+aFeTRmy8AoIN1pVFVVrXuTB1/n1C 6wIVT3pqC1qd1WdRrHtcpSZWa0y6bVPFbS1vrpstT/7J4vgheZex7T2Qd/Kx3yyaOszL442JpVmkI 4B1Hv/LP7zhZX1eT9WIZDvxy6IeHfys2Ovoq97tVrPcUzWzoYrUK2l+fpzzvDu5pReISi/t5ozSOP ub6C6OyB7dH/ncNE5LvA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o99FP-00Br73-Ds; Wed, 06 Jul 2022 17:55:35 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o99Dy-00Bqcs-HL for linux-arm-kernel@lists.infradead.org; Wed, 06 Jul 2022 17:54:08 +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 E8AF261F70; Wed, 6 Jul 2022 17:54:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B45BC3411C; Wed, 6 Jul 2022 17:54:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657130044; bh=1LXEg0Sy/hWnLCyKoLvuSuqs69jeSzDhglfbGxTB1As=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Kng432PtQDWsK8LBNr+9OwTpbfa7wgdpXZJYru0H8angu/QWDRzre+41m71kh/eR5 ELeQ+DND70MvCs24JbVXrmIHdnA1jScE72shCaRCbBJ/ryJ0wo5RuC+/ssXy46DnsF wNJuestD3qji/vExt20oNFE20Suz9vqS7uJzB5lv8oXF7MlkkdS7WfsHPmWK961yJU 4r6nJCgh9+2Lqytca0WbQvhr16f4JMn/3wT0beEDBiF75S1C3XElJzZytdfapvTO2R gyk8yo+Mko3MAV1f5pdNPzM2FjvYOI5T0l2YmA5DvXsnGOarGqKo3yrEEnLWu9R72t 7CQwc/4ulRC7w== From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Suzuki K Poulose , Szabolcs Nagy , linux-arm-kernel@lists.infradead.org, Mark Brown Subject: [PATCH v4 3/3] arm64/hwcap: Support FEAT_EBF16 Date: Wed, 6 Jul 2022 18:52:56 +0100 Message-Id: <20220706175256.847703-4-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220706175256.847703-1-broonie@kernel.org> References: <20220706175256.847703-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3383; h=from:subject; bh=1LXEg0Sy/hWnLCyKoLvuSuqs69jeSzDhglfbGxTB1As=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBixcv2FSqZ2wenvhtKpwtndqEAbXh+Ri/RTwsZiXHT Y6sFGXuJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYsXL9gAKCRAk1otyXVSH0O3QB/ 4lqTR4qYW6i8vJ6JXe3wWB8LSfnJFz3X1sxYl3cnk87nzJ10OuntgbK6JAFdiG5YmNk2SYhXBzSHrt StO5CSfxCsg4JETDLHXaFds4dgesOi7vjMJUb9nW4WQbfEPYbzG2btY9umFE5xqvEzP3wAtzS+AatO OXv70zXF11X2mH9lXcEjxiSJoN8DFUdRgg/UE8E8VXPH/rhJ+tv8AFPNjzS2lYNCivTRMainsQ/rza 2TFcpDlHTAOsuIWQARu4ZcUlLbpuTOvZ/7TChQDETUTw3CkegISTtCXQO835ZRKpra4mQsrCQ86nYO W1Q34xQHpheVZ5CgR59WU+z5g0IWAS 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-20220706_105406_715910_B62C1E60 X-CRM114-Status: GOOD ( 13.88 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The v9.2 feature FEAT_EBF16 provides support for an extended BFloat16 mode. Allow userspace to discover system support for this feature by adding a hwcap for it. Signed-off-by: Mark Brown --- Documentation/arm64/elf_hwcaps.rst | 4 ++++ 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, 8 insertions(+) diff --git a/Documentation/arm64/elf_hwcaps.rst b/Documentation/arm64/elf_hwcaps.rst index 3d116fb536c5..31fc10b833dd 100644 --- a/Documentation/arm64/elf_hwcaps.rst +++ b/Documentation/arm64/elf_hwcaps.rst @@ -301,6 +301,10 @@ HWCAP2_WFXT Functionality implied by ID_AA64ISAR2_EL1.WFXT == 0b0010. +HWCAP2_EBF16 + + Functionality implied by ID_AA64ISAR1_EL1.BF16 == 0b0010. + 4. Unused AT_HWCAP bits ----------------------- diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 9b5fdc114f8c..cef4ae7a3d8b 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -118,6 +118,7 @@ #define KERNEL_HWCAP_SME_F32F32 __khwcap2_feature(SME_F32F32) #define KERNEL_HWCAP_SME_FA64 __khwcap2_feature(SME_FA64) #define KERNEL_HWCAP_WFXT __khwcap2_feature(WFXT) +#define KERNEL_HWCAP_EBF16 __khwcap2_feature(EBF16) /* * 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 cc2ccd0a9edf..ed97fd95bdf5 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -91,5 +91,6 @@ #define HWCAP2_SME_F32F32 (1 << 29) #define HWCAP2_SME_FA64 (1 << 30) #define HWCAP2_WFXT (1UL << 31) +#define HWCAP2_EBF16 (1UL << 32) #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 5ba226f3721c..c84f97797985 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2623,6 +2623,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FRINTTS_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FRINT), HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_SB_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_SB), HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_BF16_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_BF16), + HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_BF16_SHIFT, 4, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_EBF16), HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DGH_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DGH), HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_I8MM_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_I8MM), HWCAP_CAP(SYS_ID_AA64MMFR2_EL1, ID_AA64MMFR2_AT_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_USCAT), diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 8eff0a34ffd4..2ca131243c30 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -107,6 +107,7 @@ static const char *const hwcap_str[] = { [KERNEL_HWCAP_SME_F32F32] = "smef32f32", [KERNEL_HWCAP_SME_FA64] = "smefa64", [KERNEL_HWCAP_WFXT] = "wfxt", + [KERNEL_HWCAP_EBF16] = "ebf16", }; #ifdef CONFIG_COMPAT