From nobody Wed Apr 8 03:13:56 2026 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 11DD1C433FE for ; Sat, 22 Oct 2022 02:47:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229661AbiJVCrI (ORCPT ); Fri, 21 Oct 2022 22:47:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229634AbiJVCrF (ORCPT ); Fri, 21 Oct 2022 22:47:05 -0400 Received: from m12-12.163.com (m12-12.163.com [220.181.12.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2E1D428487C for ; Fri, 21 Oct 2022 19:47:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=Oydpo FCe9+Y0CII8gxzK+nMqaPhZXIic+yLDuWv+Suo=; b=ZsXsb73/Wl75+dVhKfVxN P3yF3IdJsm+Wn9rMJJiWhILq4h8/tilw7W5L8cPqOc6dUrW8CWrTLeoKgt5hXF8y Pr9aKYDoNV97ZMuV3jRlExhvswaypfsvazj/b3L3Em5hCvTNc2q7VD/9A/NjpjEf Ah071ZEfJkJ+11aZtY9qfQ= Received: from localhost.localdomain (unknown [171.221.146.106]) by smtp8 (Coremail) with SMTP id DMCowAAHqiRpWVNjXpmhjQ--.55403S4; Sat, 22 Oct 2022 10:46:19 +0800 (CST) From: Chen Lin To: will@kernel.org Cc: robin.murphy@arm.com, joro@8bytes.org, treding@nvidia.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Chen Lin Subject: [PATCH] iommu/arm-smmu: Warn once when the perfetcher errata patch fails to allpy Date: Sat, 22 Oct 2022 10:45:59 +0800 Message-Id: <20221022024559.4913-1-chen45464546@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: DMCowAAHqiRpWVNjXpmhjQ--.55403S4 X-Coremail-Antispam: 1Uf129KBjvdXoWrtw45XF4fKr43WF17tF4fZrb_yoWktFcEv3 WrZrnrA34rArW7Ww1YqFySy3sYkr47ZrZ7Wr4Sv3s3Jr9rXFyrAanFqFn5Kw4xGFy0vFy7 tF1YqayxJry7WjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU8nZ23UUUUU== X-Originating-IP: [171.221.146.106] X-CM-SenderInfo: hfkh0kqvuwkkiuw6il2tof0z/1tbiGhuinlaEDNVZLQAAsC Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Chen Lin Default reset value of secure banked register SMMU_sACR.cache_lock is 1. If it is not been set to 0 by secure software(eg: atf), the non-secure=20 linux cannot clear ARM_MMU500_ACTLR_CPRE bit. In this situation, the prefetcher errata is not applied successfully, warn once. Signed-off-by: Chen Lin --- drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm= /arm-smmu/arm-smmu-impl.c index 658f3cc83278..2d2252b3e518 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c @@ -136,6 +136,9 @@ int arm_mmu500_reset(struct arm_smmu_device *smmu) reg =3D arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR); reg &=3D ~ARM_MMU500_ACTLR_CPRE; arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_ACTLR, reg); + reg =3D arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR); + if (reg & ARM_MMU500_ACTLR_CPRE) + dev_warn_once(smmu->dev, "Failed to alpply prefetcher errata patch, che= ck SMMU_sACR.cache_lock\n"); } =20 return 0; --=20 2.25.1