From nobody Fri Oct 17 12:01:44 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFCB7C433FE for ; Wed, 19 Oct 2022 08:47:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231552AbiJSIq7 (ORCPT ); Wed, 19 Oct 2022 04:46:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231433AbiJSIpX (ORCPT ); Wed, 19 Oct 2022 04:45:23 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 069137FF97; Wed, 19 Oct 2022 01:44:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D099F617E8; Wed, 19 Oct 2022 08:41:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6FF7C433C1; Wed, 19 Oct 2022 08:41:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666168868; bh=ErxrWl722wXIty3H7Pgaq1NO4W94OcHK1F2Tf3zP8vs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=chd6Fy8dkSMHt+E0lKvxuQVpzJ38q1bI3A254x59LAKoEh9+nILdno5UuTcCiyyDr cOsGjrKKkfW/6BnhEXJEqrD6fjJjcaxm4ShrOZrNivf2stRZhQseoCiPwJQHktdhtL S9pizkB2NYuIhm5raW38T0GjBASkISRb3SMkZA00= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Morse , Catalin Marinas Subject: [PATCH 6.0 081/862] arm64: errata: Add Cortex-A55 to the repeat tlbi list Date: Wed, 19 Oct 2022 10:22:48 +0200 Message-Id: <20221019083253.511410995@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: James Morse commit 171df58028bf4649460fb146a56a58dcb0c8f75a upstream. Cortex-A55 is affected by an erratum where in rare circumstances the CPUs may not handle a race between a break-before-make sequence on one CPU, and another CPU accessing the same page. This could allow a store to a page that has been unmapped. Work around this by adding the affected CPUs to the list that needs TLB sequences to be done twice. Signed-off-by: James Morse Cc: Link: https://lore.kernel.org/r/20220930131959.3082594-1-james.morse@arm.com Signed-off-by: Catalin Marinas Signed-off-by: Greg Kroah-Hartman --- Documentation/arm64/silicon-errata.rst | 2 ++ arch/arm64/Kconfig | 17 +++++++++++++++++ arch/arm64/kernel/cpu_errata.c | 5 +++++ 3 files changed, 24 insertions(+) --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -76,6 +76,8 @@ stable kernels. +----------------+-----------------+-----------------+--------------------= ---------+ | ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_15309= 23 | +----------------+-----------------+-----------------+--------------------= ---------+ +| ARM | Cortex-A55 | #2441007 | ARM64_ERRATUM_24410= 07 | ++----------------+-----------------+-----------------+--------------------= ---------+ | ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_83207= 5 | +----------------+-----------------+-----------------+--------------------= ---------+ | ARM | Cortex-A57 | #852523 | N/A = | --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -632,6 +632,23 @@ config ARM64_ERRATUM_1530923 config ARM64_WORKAROUND_REPEAT_TLBI bool =20 +config ARM64_ERRATUM_2441007 + bool "Cortex-A55: Completion of affected memory accesses might not be gua= ranteed by completion of a TLBI" + default y + select ARM64_WORKAROUND_REPEAT_TLBI + help + This option adds a workaround for ARM Cortex-A55 erratum #2441007. + + Under very rare circumstances, affected Cortex-A55 CPUs + may not handle a race between a break-before-make sequence on one + CPU, and another CPU accessing the same page. This could allow a + store to a page that has been unmapped. + + Work around this by adding the affected CPUs to the list that needs + TLB sequences to be done twice. + + If unsure, say Y. + config ARM64_ERRATUM_1286807 bool "Cortex-A76: Modification of the translation table for a virtual add= ress might lead to read-after-read ordering violation" default y --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -214,6 +214,11 @@ static const struct arm64_cpu_capabiliti ERRATA_MIDR_RANGE(MIDR_QCOM_KRYO_4XX_GOLD, 0xc, 0xe, 0xf, 0xe), }, #endif +#ifdef CONFIG_ARM64_ERRATUM_2441007 + { + ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), + }, +#endif #ifdef CONFIG_ARM64_ERRATUM_2441009 { /* Cortex-A510 r0p0 -> r1p1. Fixed in r1p2 */