From patchwork Thu Jan 19 16:58:40 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Gross X-Patchwork-Id: 9526411 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 BA65060459 for ; Thu, 19 Jan 2017 17:00:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AC4A42860C for ; Thu, 19 Jan 2017 17:00:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A11E32860F; Thu, 19 Jan 2017 17:00:54 +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=-1.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, RDNS_NONE,T_DKIM_INVALID autolearn=no version=3.3.1 Received: from bombadil.infradead.org (unknown [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CFEF52860C for ; Thu, 19 Jan 2017 17:00:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cUG4x-0005xn-QR; Thu, 19 Jan 2017 17:00:51 +0000 Received: from mail-ot0-f180.google.com ([74.125.82.180]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cUG4S-0004Sa-Kg for linux-arm-kernel@lists.infradead.org; Thu, 19 Jan 2017 17:00:22 +0000 Received: by mail-ot0-f180.google.com with SMTP id 65so36418334otq.2 for ; Thu, 19 Jan 2017 09:00:00 -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=VsBFqXCGUrZQmuTK1e7hLnuwUnp859LwD7l3Vh6Wspk=; b=hpdKnWNqHf7G/AXvXKZUfUAz/2TKnivI4Njaj3zQogoMtwh5v1ZbNTzavOxsY5+8cH lOgjKw1XF2IgEXfz6ZixZCF6vr+88roY1sp0105xA3iAMcxkuF5+DReMPIoLxTsRKhok 9TGr0XjLeiEhf1ci/kB8ygU14fnaYS213Jg+k= 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=VsBFqXCGUrZQmuTK1e7hLnuwUnp859LwD7l3Vh6Wspk=; b=Uvd9ob54hGpeVr7JqS0MhWGCjiKDYN5At8H9INycqnmIUj6wlPkZLPBTvO9JL+Tyx0 lpRWwgfBr2HiOhcm6P/uZ0WIPAe2TUNMUKpje/THhrpoKfdv16XOSSBJj+UUnLst3/ly fQbOfLwcTh5wQ6VoTvP7OKAZRPY1cZcE0Nqs+grcw0CR7GOw2LBaCsw6GDRgsS15u+w7 hO87xwI8gvUoqGmwd0Mw1DbuFFIyTCnSQoF4mT/hTWRVV4KtnCOrsgaltiVpgP+kJZvH EUWMj77jsK54o+CtPZeKg9a0YFNJxK9o1uUy7lZXNuZBoTTSoohPh/IKkKRUOfAi4Nfk CR6g== X-Gm-Message-State: AIkVDXIQe1qTA3UqFHtmiDdW+HHfWhRXB7rDZLrrb9209pP+UEF4XktABiAd4VzPwl39CgvA X-Received: by 10.157.62.203 with SMTP id b69mr4594996otc.30.1484845139478; Thu, 19 Jan 2017 08:58:59 -0800 (PST) Received: from localhost ([2602:306:3406:6500:858:937d:2536:79fb]) by smtp.gmail.com with ESMTPSA id e22sm2220410otc.15.2017.01.19.08.58.58 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 19 Jan 2017 08:58:59 -0800 (PST) From: Andy Gross To: linux-arm-kernel@lists.infradead.org Subject: [Patch v4 2/2] firmware: qcom: scm: Fix interrupted SCM calls Date: Thu, 19 Jan 2017 10:58:40 -0600 Message-Id: <1484845120-3364-3-git-send-email-andy.gross@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1484845120-3364-1-git-send-email-andy.gross@linaro.org> References: <1484845120-3364-1-git-send-email-andy.gross@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170119_090020_728070_D79A5701 X-CRM114-Status: GOOD ( 15.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lorenzo.pieralisi@arm.com, linux-arm-msm@vger.kernel.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, Bjorn Andersson , Kevin Hilman , Andy Gross , linux@armlinux.org.uk MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a Qualcomm specific quirk to the arm_smccc_smc call. On Qualcomm ARM64 platforms, the SMC call can return before it has completed. If this occurs, the call can be restarted, but it requires using the returned session ID value from the interrupted SMC call. The quirk stores off the session ID from the interrupted call in the quirk structure so that it can be used by the caller. This patch folds in a fix given by Sricharan R: https://lkml.org/lkml/2016/9/28/272 Signed-off-by: Andy Gross Reviewed-by: Will Deacon --- arch/arm64/kernel/smccc-call.S | 9 ++++++++- drivers/firmware/qcom_scm-64.c | 13 ++++++++++--- include/linux/arm-smccc.h | 11 ++++++++--- 3 files changed, 26 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kernel/smccc-call.S b/arch/arm64/kernel/smccc-call.S index 6290696..72ecdca 100644 --- a/arch/arm64/kernel/smccc-call.S +++ b/arch/arm64/kernel/smccc-call.S @@ -12,6 +12,7 @@ * */ #include +#include #include .macro SMCCC instr @@ -20,7 +21,13 @@ ldr x4, [sp] stp x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS] stp x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS] - ret + ldr x4, [sp, #8] + cbz x4, 1f /* no quirk structure */ + ldr x9, [x4, #ARM_SMCCC_QUIRK_ID_OFFS] + cmp x9, #ARM_SMCCC_QUIRK_QCOM_A6 + b.ne 1f + str x6, [x4, ARM_SMCCC_QUIRK_STATE_OFFS] +1: ret .cfi_endproc .endm diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c index 4a0f5ea..1e2e519 100644 --- a/drivers/firmware/qcom_scm-64.c +++ b/drivers/firmware/qcom_scm-64.c @@ -91,6 +91,7 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id, dma_addr_t args_phys = 0; void *args_virt = NULL; size_t alloc_len; + struct arm_smccc_quirk quirk = {.id = ARM_SMCCC_QUIRK_QCOM_A6}; if (unlikely(arglen > N_REGISTER_ARGS)) { alloc_len = N_EXT_QCOM_SCM_ARGS * sizeof(u64); @@ -131,10 +132,16 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id, qcom_smccc_convention, ARM_SMCCC_OWNER_SIP, fn_id); + quirk.state.a6 = 0; + do { - arm_smccc_smc(cmd, desc->arginfo, desc->args[0], - desc->args[1], desc->args[2], x5, 0, 0, - res); + arm_smccc_smc_quirk(cmd, desc->arginfo, desc->args[0], + desc->args[1], desc->args[2], x5, + quirk.state.a6, 0, res, &quirk); + + if (res->a0 == QCOM_SCM_INTERRUPTED) + cmd = res->a0; + } while (res->a0 == QCOM_SCM_INTERRUPTED); mutex_unlock(&qcom_scm_lock); diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h index ab937db..6cd101e 100644 --- a/include/linux/arm-smccc.h +++ b/include/linux/arm-smccc.h @@ -14,9 +14,6 @@ #ifndef __LINUX_ARM_SMCCC_H #define __LINUX_ARM_SMCCC_H -#include -#include - /* * This file provides common defines for ARM SMC Calling Convention as * specified in @@ -60,6 +57,13 @@ #define ARM_SMCCC_OWNER_TRUSTED_OS 50 #define ARM_SMCCC_OWNER_TRUSTED_OS_END 63 +#define ARM_SMCCC_QUIRK_NONE 0 +#define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */ + +#ifndef __ASSEMBLY__ + +#include +#include /** * struct arm_smccc_res - Result from SMC/HVC call * @a0-a3 result values from registers 0 to 3 @@ -120,4 +124,5 @@ asmlinkage void arm_smccc_hvc(unsigned long a0, unsigned long a1, #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__) +#endif /*__ASSEMBLY__*/ #endif /*__LINUX_ARM_SMCCC_H*/