From patchwork Tue Jan 31 07:58:41 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Gross X-Patchwork-Id: 9546693 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CB9216016C for ; Tue, 31 Jan 2017 07:58:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BB4762815E for ; Tue, 31 Jan 2017 07:58:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ADCD928285; Tue, 31 Jan 2017 07:58:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 113E22815E for ; Tue, 31 Jan 2017 07:58:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751199AbdAaH6z (ORCPT ); Tue, 31 Jan 2017 02:58:55 -0500 Received: from mail-oi0-f41.google.com ([209.85.218.41]:34485 "EHLO mail-oi0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750873AbdAaH6u (ORCPT ); Tue, 31 Jan 2017 02:58:50 -0500 Received: by mail-oi0-f41.google.com with SMTP id s203so77981092oie.1 for ; Mon, 30 Jan 2017 23:58:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=h9XNvt/BEMU6WUgeGaEtnYJQ41V3VtnvZBd4d3mk8tk=; b=heXCz7gVB2KT8dNnT2P+zWc/jH6URRQ+8zP7Bcdi67aYTRzIdD5+XqDpAKOl43bHmf wtCS+h7vPkQxUnk8v/c/OQA6Ef32p0e6hyeJq3F5DFSuzSrCQIovTjlqQOw5sYWCysJW +lEEYNkFF/sibd2MYIFjEmBxfZRXPUvHQ7kXE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=h9XNvt/BEMU6WUgeGaEtnYJQ41V3VtnvZBd4d3mk8tk=; b=Ryud1jjIRQMynHgM501fvDlVQHVc2XskUPEuHfDkNfg9rKMaAHs0P2U7CRzHsTu3tG AC1mDS2enpCXTdkNsMteE/eQmeuEfactPnxJ3oeFNJ4pAYkESITJPF71SU9w+37GGBqc vSjwCBRUG4uFxEBVDRMZoh74y9z50MX9buKJybBxCvl4iSeLcV9310mU9qEfyUdf/Uhv Y3/bkn6CMVom19fOYAYibBpnHpCYeRZ4rnbVYC4DNI+SiEvWzgtLtvr1gjuQGPWLkQRn KCC172QqapbymRwY+3NEqhBxnBH63wAr2w3ql8Cp91g2hBIADX8UKZtF9RvMS5GrVJ3V ATgQ== X-Gm-Message-State: AIkVDXKuiBIRUO1YmRLRP+b1DCbqBrj6mooMD1/ONI43OW8gufAUBwNAoUkDlkffzijH/oUp X-Received: by 10.202.214.18 with SMTP id n18mr12862983oig.201.1485849529400; Mon, 30 Jan 2017 23:58:49 -0800 (PST) Received: from localhost ([2602:306:3406:6500:9818:4608:a55b:37e]) by smtp.gmail.com with ESMTPSA id 205sm8407338oid.4.2017.01.30.23.58.48 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 30 Jan 2017 23:58:48 -0800 (PST) From: Andy Gross To: linux-arm-kernel@lists.infradead.org Cc: lorenzo.pieralisi@arm.com, linux-arm-msm@vger.kernel.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, Bjorn Andersson , Kevin Hilman , linux@armlinux.org.uk, ynorov@caviumnetworks.com, james.morse@arm.com, Olof Johansson , Andy Gross Subject: [Patch v5 1/2] arm: kernel: Add SMC structure parameter Date: Tue, 31 Jan 2017 01:58:41 -0600 Message-Id: <1485849522-12806-2-git-send-email-andy.gross@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1485849522-12806-1-git-send-email-andy.gross@linaro.org> References: <1485849522-12806-1-git-send-email-andy.gross@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a quirk parameter to the arm_smccc_smc call. The quirk structure allows for specialized SMC operations due to SoC specific requirements. The current arm_smccc_smc is renamed and macros are used instead to specify the standard arm_smccc_smc or the arm_smccc_smc_quirk function. This patch and partial implementation was suggested by Will Deacon. Signed-off-by: Andy Gross Reviewed-by: Will Deacon --- arch/arm/kernel/armksyms.c | 2 +- arch/arm/kernel/smccc-call.S | 7 ++++--- arch/arm64/kernel/arm64ksyms.c | 2 +- arch/arm64/kernel/asm-offsets.c | 7 +++++-- arch/arm64/kernel/smccc-call.S | 7 ++++--- include/linux/arm-smccc.h | 27 +++++++++++++++++++++++---- 6 files changed, 38 insertions(+), 14 deletions(-) diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c index 7e45f69..c2a8e79 100644 --- a/arch/arm/kernel/armksyms.c +++ b/arch/arm/kernel/armksyms.c @@ -178,6 +178,6 @@ #endif #ifdef CONFIG_HAVE_ARM_SMCCC -EXPORT_SYMBOL(arm_smccc_smc); +EXPORT_SYMBOL(__arm_smccc_smc); EXPORT_SYMBOL(arm_smccc_hvc); #endif diff --git a/arch/arm/kernel/smccc-call.S b/arch/arm/kernel/smccc-call.S index 2e48b67..eb666d7 100644 --- a/arch/arm/kernel/smccc-call.S +++ b/arch/arm/kernel/smccc-call.S @@ -46,11 +46,12 @@ UNWIND( .fnend) /* * void smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2, * unsigned long a3, unsigned long a4, unsigned long a5, - * unsigned long a6, unsigned long a7, struct arm_smccc_res *res) + * unsigned long a6, unsigned long a7, struct arm_smccc_res *res, + * struct arm_smccc_quirk *quirk) */ -ENTRY(arm_smccc_smc) +ENTRY(__arm_smccc_smc) SMCCC SMCCC_SMC -ENDPROC(arm_smccc_smc) +ENDPROC(__arm_smccc_smc) /* * void smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2, diff --git a/arch/arm64/kernel/arm64ksyms.c b/arch/arm64/kernel/arm64ksyms.c index 78f3680..43370a0 100644 --- a/arch/arm64/kernel/arm64ksyms.c +++ b/arch/arm64/kernel/arm64ksyms.c @@ -73,5 +73,5 @@ #endif /* arm-smccc */ -EXPORT_SYMBOL(arm_smccc_smc); +EXPORT_SYMBOL(__arm_smccc_smc); EXPORT_SYMBOL(arm_smccc_hvc); diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index bc049af..b3bb7ef 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -143,8 +143,11 @@ int main(void) DEFINE(SLEEP_STACK_DATA_SYSTEM_REGS, offsetof(struct sleep_stack_data, system_regs)); DEFINE(SLEEP_STACK_DATA_CALLEE_REGS, offsetof(struct sleep_stack_data, callee_saved_regs)); #endif - DEFINE(ARM_SMCCC_RES_X0_OFFS, offsetof(struct arm_smccc_res, a0)); - DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2)); + DEFINE(ARM_SMCCC_RES_X0_OFFS, offsetof(struct arm_smccc_res, a0)); + DEFINE(ARM_SMCCC_RES_X2_OFFS, offsetof(struct arm_smccc_res, a2)); + DEFINE(ARM_SMCCC_QUIRK_ID_OFFS, offsetof(struct arm_smccc_quirk, id)); + DEFINE(ARM_SMCCC_QUIRK_STATE_OFFS, offsetof(struct arm_smccc_quirk, state)); + BLANK(); DEFINE(HIBERN_PBE_ORIG, offsetof(struct pbe, orig_address)); DEFINE(HIBERN_PBE_ADDR, offsetof(struct pbe, address)); diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S index ae0496f..6290696 100644 --- a/arch/arm64/kernel/smccc-call.S +++ b/arch/arm64/kernel/smccc-call.S @@ -27,11 +27,12 @@ /* * void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2, * unsigned long a3, unsigned long a4, unsigned long a5, - * unsigned long a6, unsigned long a7, struct arm_smccc_res *res) + * unsigned long a6, unsigned long a7, struct arm_smccc_res *res, + * struct arm_smccc_quirk *quirk) */ -ENTRY(arm_smccc_smc) +ENTRY(__arm_smccc_smc) SMCCC smc -ENDPROC(arm_smccc_smc) +ENDPROC(__arm_smccc_smc) /* * void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2, diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index b5abfda..ab937db 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -72,19 +72,34 @@ struct arm_smccc_res { }; /** - * arm_smccc_smc() - make SMC calls + * struct arm_smccc_quirk - Contains quirk information + * @id: quirk identification + * @state: quirk specific information + * @a6: Qualcomm quirk entry for returning post-smc call contents of a6 + */ +struct arm_smccc_quirk { + int id; + union { + unsigned long a6; + } state; +}; + +/** + * __arm_smccc_smc() - make SMC calls * @a0-a7: arguments passed in registers 0 to 7 * @res: result values from registers 0 to 3 + * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required. * * This function is used to make SMC calls following SMC Calling Convention. * The content of the supplied param are copied to registers 0 to 7 prior * to the SMC instruction. The return values are updated with the content - * from register 0 to 3 on return from the SMC instruction. + * from register 0 to 3 on return from the SMC instruction. An optional + * quirk structure provides vendor specific behavior. */ -asmlinkage void arm_smccc_smc(unsigned long a0, unsigned long a1, +asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5, unsigned long a6, unsigned long a7, - struct arm_smccc_res *res); + struct arm_smccc_res *res, struct arm_smccc_quirk *quirk); /** * arm_smccc_hvc() - make HVC calls @@ -101,4 +116,8 @@ asmlinkage void arm_smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a5, unsigned long a6, unsigned long a7, struct arm_smccc_res *res); +#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL) + +#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) + #endif /*__LINUX_ARM_SMCCC_H*/