From patchwork Wed Jan 11 22:31:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Gross X-Patchwork-Id: 90999 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp1347451qgi; Wed, 11 Jan 2017 14:32:14 -0800 (PST) X-Received: by 10.98.107.136 with SMTP id g130mr12921350pfc.20.1484173934233; Wed, 11 Jan 2017 14:32:14 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u6si7050839pgo.250.2017.01.11.14.32.13; Wed, 11 Jan 2017 14:32:14 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934824AbdAKWcK (ORCPT + 25 others); Wed, 11 Jan 2017 17:32:10 -0500 Received: from mail-oi0-f50.google.com ([209.85.218.50]:33121 "EHLO mail-oi0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755651AbdAKWcH (ORCPT ); Wed, 11 Jan 2017 17:32:07 -0500 Received: by mail-oi0-f50.google.com with SMTP id w204so2807346oiw.0 for ; Wed, 11 Jan 2017 14:32:07 -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=TnshbNDS5dF4PwODnXftDSTqEzhCuVYWCnUeFN9wesw=; b=KdIaw/jv9DYfByXu6ad2m0yZSL/o3dC+FTxRakY1XQGx11dg+L3WEn4NxhrrdBNV3o dxe83fXe4ZIeeT+e9QYeN3rG/ykaUYS8+Zx7Th197iMx7KUSEPwQjbdxEYRWVRISUTFS Wki7vhV9wy5W4tzl0I2E3BeS7UxJd5ZpFLWsk= 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=TnshbNDS5dF4PwODnXftDSTqEzhCuVYWCnUeFN9wesw=; b=cKsVr+6eNGfcpLMMhtpdDcEsvF/avaoHq2L6gK59CU0qaqmJHHnq5Rn4AnMA3G1+eK gSEg4UlmLEVN4ya59Gvf/gTH/PSrEJl8I3e6Agl74CBFe8iYHa34NzxK/LFXhIAZmwUd wzFh/R0qiwaMBnmVBj23nGz84tbuNso8NC4J7NTb2Q/YLF67DyKykL8gNRGGQLY7C89h mw7XpZUWIZZu0Oo41n3MMdL4xOQUzkJUi08SX9OKFnJp1/XDMXbRSpLHDxQY/RcsX3h0 xUnjNbHKEP95WN+BIeyLhBe4wizJh9COhRL69qMArbZFqlxIUE//N2X6GQ5zIcvta57T pn6g== X-Gm-Message-State: AIkVDXLaJdqGhRPTRr3wHuWQSqxlERRpdPrOcylxnrNBsgOY/fxNSPzHHNkdI1vLlq8rSLS1 X-Received: by 10.157.5.6 with SMTP id 6mr5132327otw.209.1484173926495; Wed, 11 Jan 2017 14:32:06 -0800 (PST) Received: from localhost ([2602:306:3406:6500:3c9a:46d:ea1b:62ad]) by smtp.gmail.com with ESMTPSA id b129sm3165972oia.4.2017.01.11.14.32.05 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 11 Jan 2017 14:32:06 -0800 (PST) From: Andy Gross To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, will.deacon@arm.com, lorenzo.pieralisi@arm.com, Kevin Hilman , Srinivas Kandagatla , Bjorn Andersson , linux@armlinux.org.uk, Andy Gross Subject: [Patch v3 1/2] arm: kernel: Add SMC structure parameter Date: Wed, 11 Jan 2017 16:31:57 -0600 Message-Id: <1484173918-25090-2-git-send-email-andy.gross@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1484173918-25090-1-git-send-email-andy.gross@linaro.org> References: <1484173918-25090-1-git-send-email-andy.gross@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 | 26 ++++++++++++++++++++++---- 6 files changed, 37 insertions(+), 14 deletions(-) -- 1.9.1 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..3e28d08 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -72,19 +72,33 @@ struct arm_smccc_res { }; /** - * arm_smccc_smc() - make SMC calls + * struct arm_smccc_quirk - Contains quirk information + * id contains quirk identification + * state contains the quirk specific information + */ +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: optional quirk structure * * 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 +115,8 @@ 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*/