From patchwork Tue Jun 20 09:51:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 694562 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 F2855EB64DB for ; Tue, 20 Jun 2023 09:54:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232437AbjFTJyE (ORCPT ); Tue, 20 Jun 2023 05:54:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232033AbjFTJxU (ORCPT ); Tue, 20 Jun 2023 05:53:20 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 835AF211D; Tue, 20 Jun 2023 02:51:36 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (unknown [IPv6:2001:b07:2ed:14ed:c5f8:7372:f042:90a2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 615156606F8E; Tue, 20 Jun 2023 10:51:34 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1687254695; bh=rcPOmjDU7rnsS/fpNTQ+CcSQ5KZFIIdniqaYNHmw7pQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K2h6/knEKN+xECeFsxF507s+wQKQBlpzbNmCdzF6Nhw2c02DRNY2kD8zWwAsXWFei ZqnOkRxNcdhAAcpmiQm7bvrAqzAiVCzO5ss4OYQONtyGgLIzrMRhFDFkBJTUdrPFRB vTPz2WV4KYml9TujDp5lf/S67O3hP7fGHyA8DY6hDiH4WLbn6I4H5JV0xoKYljYXXI CvpyyMTL74wDVYIyIbpUD6QNqL9cljXOX3YQY5yaKv0YMjgZuxeOSX1PxlP9QjgVbJ /13Cvd2pGTmaFGwGbIUDxNjKv0iTIDEB7rlhxfagLQTHOyWPBTJZqHHZdjYifMctpl HXJb++yWbeb6Q== From: AngeloGioacchino Del Regno To: agross@kernel.org Cc: andersson@kernel.org, konrad.dybcio@linaro.org, dmitry.baryshkov@linaro.org, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, robdclark@gmail.com, linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, AngeloGioacchino Del Regno , kernel@collabora.com Subject: [PATCH v4 3/6] iommu/qcom: Disable and reset context bank before programming Date: Tue, 20 Jun 2023 11:51:24 +0200 Message-Id: <20230620095127.96600-4-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230620095127.96600-1-angelogioacchino.delregno@collabora.com> References: <20230620095127.96600-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Writing the new TTBRs, TCRs and MAIRs on a previously enabled context bank may trigger a context fault, resulting in firmware driven AP resets: change the domain initialization programming sequence to disable the context bank(s) and to also clear the related fault address (CB_FAR) and fault status (CB_FSR) registers before writing new values to TTBR0/1, TCR/TCR2, MAIR0/1. Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu") Signed-off-by: AngeloGioacchino Del Regno --- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c index b661b559ea01..8b48f7e8f3db 100644 --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c @@ -273,6 +273,13 @@ static int qcom_iommu_init_domain(struct iommu_domain *domain, ctx->secure_init = true; } + /* Disable context bank before programming */ + iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0); + + /* Clear context bank fault address fault status registers */ + iommu_writel(ctx, ARM_SMMU_CB_FAR, 0); + iommu_writel(ctx, ARM_SMMU_CB_FSR, ARM_SMMU_FSR_FAULT); + /* TTBRs */ iommu_writeq(ctx, ARM_SMMU_CB_TTBR0, pgtbl_cfg.arm_lpae_s1_cfg.ttbr |