From patchwork Mon Jul 24 17:44:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 125129 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9010:0:b0:3e4:2afc:c1 with SMTP id l16csp1961091vqg; Mon, 24 Jul 2023 10:59:40 -0700 (PDT) X-Google-Smtp-Source: APBJJlFCoGSwcbe/RXEcCOQ8qOZneUhUN5tIYLeSmAkLPMvZLtYmGTUrXeeQOXYo7Qr1WlScJMIO X-Received: by 2002:a05:6358:926:b0:134:e59a:2ffe with SMTP id r38-20020a056358092600b00134e59a2ffemr5376614rwi.11.1690221580196; Mon, 24 Jul 2023 10:59:40 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1690221580; cv=none; d=google.com; s=arc-20160816; b=MUOIDNcOcLeesqLEOtMHwNJVLvMeIHwYJIiovObZ9lwbJ1JSdNSaA/o1v4fxXlDpaC wTL+FDM8U8D+jrRZ9y9T/oQQRmeC3+NzRE1JKH0lSC8n8Op6F7cGPOoMayMz+tyK654E NecSWybMXs8WGDxkKOsv1S0vJbnPKVDkcGEZlZwgHeddwHnh7glxz3rU+QlVY3MYjsp9 p+soCeL4xwXWovF4x+zR+3GG9P9OouxUlFH2Szl7wLq2JI2lldBXaeIwcZEyp1IuZd0d KekBSGyBYQd/2NWxIQi2kVYSdZaNbt3JlkfYUxjYy5Q4GkOcHyonGoYTMJWGxjjG7cEy gwfw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:date:mime-version:references:subject:cc:to:from :dkim-signature:dkim-signature:message-id; bh=15fa3zOR6FTjADI+P/8aKC6n9dvVMoPwTnUjFsnPU9g=; fh=cDlgSYzM/IiVZ/EC06yL1+GD3+pSK8bXSWGje/Xzf2k=; b=E4a74XEuRJQFCkI2UN2eLtB7q0ICdVNC6DI2vSPYcJ33zAieBcCp6jtAXpaU4xKGFz N/UlNjQMmvjdzU3x3N0HApbTXpXszRPvMDqfGTt2FOjM8Ni4aHqsOluTUgdpyupqj8Ul Ze+FkgWOfI1FmXNmkPLq9h6R2L2QHR3d1H3vuEWUk7wb/6t+c3l4+7or3LbKWKYzFA7s xA4TwDsIi+f+4pSIFrAspmvQIZWvcQ1XRfAgdEi3g3Xhd0PN33MV1u9jAIEolwLcofEg +z4SYbqIUSwgBxF7eAl7FNB9JqGkCXkAE9in5+PnLdphjxvqYlz0vC/loCePbKToWaGH az4w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b="Oh/zm0cz"; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id o9-20020a637e49000000b00563796a3ec6si9077268pgn.570.2023.07.24.10.59.26; Mon, 24 Jul 2023 10:59:40 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b="Oh/zm0cz"; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231769AbjGXRpt (ORCPT + 99 others); Mon, 24 Jul 2023 13:45:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231819AbjGXRog (ORCPT ); Mon, 24 Jul 2023 13:44:36 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0974F1BDF; Mon, 24 Jul 2023 10:44:11 -0700 (PDT) Message-ID: <20230724172844.399780653@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1690220650; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=15fa3zOR6FTjADI+P/8aKC6n9dvVMoPwTnUjFsnPU9g=; b=Oh/zm0czFvSOuwQLZCeK1ETIVR5LwHft9W8vWqcVgt8L5ZrOTP61lr/sJY6u1E7EWTqWeS lh653t0KzattRcslTycXPAjGTF3r5NQQ30t9R4Lyaitzy8P2zDX1xtyL4GTjusa/fwnXpn lQ3u2gclSzb1k9YVPdwmibu3wSGprQZHGVHWh7CLwEg/ha6PaLzP/ToL3X/0s7UgcdyHeO ERLGm0pG2SZbxhC2YtMs87VjMp1nTl0Ysj1BZ2lzt4+bTW4xh60VCUecyZ8OMx8y6Zpafi A3WW6haWN2wbpuQok85/MG8/a2Yiq9BO6Va2XExEAq1S3yvVJMAl6jz2OJ/+8w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1690220650; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=15fa3zOR6FTjADI+P/8aKC6n9dvVMoPwTnUjFsnPU9g=; b=Yj8apQgXs1sQo9COSKMBbvMFmzOfBIAsDbq5bdKWAcujWzsJzr8ox4E/3Z9Eajkc47brzf YGYBEdVz9OEF7DBA== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Tom Lendacky , Andrew Cooper , Arjan van de Ven , "James E.J. Bottomley" , Dick Kennedy , James Smart , "Martin K. Petersen" , linux-scsi@vger.kernel.org, linux-hwmon@vger.kernel.org, Jean Delvare , Huang Rui , Guenter Roeck , Steve Wahl , Mike Travis , Dimitri Sivanich , Russ Anderson Subject: [patch 12/29] x86/cpu: Provide cpuid_read() et al. References: <20230724155329.474037902@linutronix.de> MIME-Version: 1.0 Date: Mon, 24 Jul 2023 19:44:09 +0200 (CEST) X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772325783608172462 X-GMAIL-MSGID: 1772325783608172462 Provide a few helper functions to read CPUID leafs or individual registers into a data structure without requiring unions. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/cpuid.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) --- a/arch/x86/include/asm/cpuid.h +++ b/arch/x86/include/asm/cpuid.h @@ -127,6 +127,38 @@ static inline unsigned int cpuid_edx(uns return edx; } +static inline void __cpuid_read(unsigned int leaf, unsigned int subleaf, u32 *regs) +{ + regs[CPUID_EAX] = leaf; + regs[CPUID_ECX] = subleaf; + __cpuid(regs, regs + 1, regs + 2, regs + 3); +} + +#define cpuid_subleaf(leaf, subleaf, regs) \ + BUILD_BUG_ON(sizeof(*(regs)) != 16); \ + __cpuid_read(leaf, subleaf, (u32 *)(regs)) + +#define cpuid_leaf(leaf, regs) \ + BUILD_BUG_ON(sizeof(*(regs)) != 16); \ + __cpuid_read(leaf, 0, (u32 *)(regs)) + +static inline void __cpuid_read_reg(unsigned int leaf, unsigned int subleaf, + enum cpuid_regs_idx regidx, u32 *reg) +{ + u32 regs[4]; + + __cpuid_read(leaf, subleaf, regs); + *reg = regs[regidx]; +} + +#define cpuid_subleaf_reg(leaf, subleaf, regidx, reg) \ + BUILD_BUG_ON(sizeof(*(reg)) != 4); \ + __cpuid_read_reg(leaf, subleaf, regidx, (u32 *)(reg)) + +#define cpuid_leaf_reg(leaf, regidx, reg) \ + BUILD_BUG_ON(sizeof(*(reg)) != 4); \ + __cpuid_read_reg(leaf, 0, regidx, (u32 *)(reg)) + static __always_inline bool cpuid_function_is_indexed(u32 function) { switch (function) {