From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55140C41536 for ; Wed, 12 May 2021 19:57:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3DB09613F7 for ; Wed, 12 May 2021 19:57:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383856AbhELTzh (ORCPT ); Wed, 12 May 2021 15:55:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:53578 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241687AbhELSIs (ORCPT ); Wed, 12 May 2021 14:08:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 92917616ED; Wed, 12 May 2021 18:05:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620842706; bh=xO9XK9Tn+qJGOfd2RkV/VZWWHNps1oUzT1w5ix6vWmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KpKjSEmwbiQ5WOeVSEeak7Ar5nCCDL9Qug/Zo7qYnFjRGBMgd6jhcHawVmvJlLI3r /HaeNy6UHady/Lpk+Pwq3o/Csidj2Txfm7yd7+1cfvDwyc5I4PX7lqlKINjE3ZFN9Q v6eq7afKw6ufq4Vxu8D2H+KPWRshZH2/+V0aur2Y1KGL4aPLivS5pFH+cBlGCag9SQ snkOC+4n5r1yrygwRlarZElMZOj1nt1nNGYiveDEH8ezBxWh2uS3O7udvro+OQ/JKh 8g4PfimbMc/F/NRDcpDiBG5+tJqHSwSz/Qnkcyz01os91XMpiGrcjJprDt0VUIbmfK g3n+gYmBoLktw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Manivannan Sadhasivam , Bjorn Andersson , Russell King , Sasha Levin , linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.19 09/18] ARM: 9075/1: kernel: Fix interrupted SMC calls Date: Wed, 12 May 2021 14:04:40 -0400 Message-Id: <20210512180450.665586-9-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210512180450.665586-1-sashal@kernel.org> References: <20210512180450.665586-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Manivannan Sadhasivam [ Upstream commit 57ac51667d8cd62731223d687e5fe7b41c502f89 ] On Qualcomm ARM32 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 ARM32 SMCC code already has the provision to add platform specific quirks for things like this. So let's make use of it and add the Qualcomm specific quirk (ARM_SMCCC_QUIRK_QCOM_A6) used by the QCOM_SCM driver. This change is similar to the below one added for ARM64 a while ago: commit 82bcd087029f ("firmware: qcom: scm: Fix interrupted SCM calls") Without this change, the Qualcomm ARM32 platforms like SDX55 will return -EINVAL for SMC calls used for modem firmware loading and validation. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Bjorn Andersson Signed-off-by: Russell King Signed-off-by: Sasha Levin --- arch/arm/kernel/asm-offsets.c | 3 +++ arch/arm/kernel/smccc-call.S | 11 ++++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c index ae85f67a6352..40afe953a0e2 100644 --- a/arch/arm/kernel/asm-offsets.c +++ b/arch/arm/kernel/asm-offsets.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "signal.h" /* @@ -159,6 +160,8 @@ int main(void) DEFINE(SLEEP_SAVE_SP_PHYS, offsetof(struct sleep_save_sp, save_ptr_stash_phys)); DEFINE(SLEEP_SAVE_SP_VIRT, offsetof(struct sleep_save_sp, save_ptr_stash)); #endif + 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(DMA_BIDIRECTIONAL, DMA_BIDIRECTIONAL); DEFINE(DMA_TO_DEVICE, DMA_TO_DEVICE); diff --git a/arch/arm/kernel/smccc-call.S b/arch/arm/kernel/smccc-call.S index e5d43066b889..13d307cd364c 100644 --- a/arch/arm/kernel/smccc-call.S +++ b/arch/arm/kernel/smccc-call.S @@ -12,7 +12,9 @@ * */ #include +#include +#include #include #include #include @@ -36,7 +38,14 @@ UNWIND( .fnstart) UNWIND( .save {r4-r7}) ldm r12, {r4-r7} \instr - pop {r4-r7} + ldr r4, [sp, #36] + cmp r4, #0 + beq 1f // No quirk structure + ldr r5, [r4, #ARM_SMCCC_QUIRK_ID_OFFS] + cmp r5, #ARM_SMCCC_QUIRK_QCOM_A6 + bne 1f // No quirk present + str r6, [r4, #ARM_SMCCC_QUIRK_STATE_OFFS] +1: pop {r4-r7} ldr r12, [sp, #(4 * 4)] stm r12, {r0-r3} bx lr -- 2.30.2