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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 F0BECC4CECC for ; Sun, 15 Sep 2019 12:35:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2F94214D8 for ; Sun, 15 Sep 2019 12:35:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="FcRrG3wk"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="VAAFCeAp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730642AbfIOMfZ (ORCPT ); Sun, 15 Sep 2019 08:35:25 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:47070 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726246AbfIOMfY (ORCPT ); Sun, 15 Sep 2019 08:35:24 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 7CD9960A50; Sun, 15 Sep 2019 12:35:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1568550923; bh=/dm/RBN7YVpLJXBPoMfGddvjbqU4V8BUtqoTROtEb0c=; h=From:To:Cc:Subject:Date:From; b=FcRrG3wkuMGchyzt/pdAUtxyGXoOxeVNK0GEHEA99x/lf063H5h5wb541ZTU7Fo1V 6JZO2qUqdzN1K+D/70exL2uaac/oUUBBFmj97oR4JaH+yQkhN7BmLkf3jMrvwc8iCy aW8MKQUM2nPbEQwDt5Rrd2AxZMnH43dV9QrtdNr8= Received: from blr-ubuntu-253.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan@codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 3741F602F8; Sun, 15 Sep 2019 12:35:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1568550922; bh=/dm/RBN7YVpLJXBPoMfGddvjbqU4V8BUtqoTROtEb0c=; h=From:To:Cc:Subject:Date:From; b=VAAFCeApn0WXGp/4/FApM+fay7CmxjJ8Q5cVy4UQYLkwVG18Nan+eW+t9wGPhGlVK YNx4nA0ZbSS7p0TzzYprq1uHHTPmA0hP7Vu/NBOwGaUqodFsdSvUUhfJ+so2xW4AhM SqxqbzWXdP+PdD9hT8YMxZ31B8j8Hy8Dsx9+admg= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 3741F602F8 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=saiprakash.ranjan@codeaurora.org From: Sai Prakash Ranjan To: Will Deacon , Robin Murphy , Joerg Roedel , iommu@lists.linux-foundation.org, Andy Gross , Stephen Boyd , Vivek Gautam , Rajendra Nayak Cc: bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Sai Prakash Ranjan Subject: [PATCHv5 0/3] QCOM smmu-500 wait-for-safe handling for sdm845 Date: Sun, 15 Sep 2019 18:05:00 +0530 Message-Id: X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Previous version of the patches are at [1]: QCOM's implementation of smmu-500 on sdm845 adds a hardware logic called wait-for-safe. This logic helps in meeting the invalidation requirements from 'real-time clients', such as display and camera. This wait-for-safe logic ensures that the invalidations happen after getting an ack from these devices. In this patch-series we are disabling this wait-for-safe logic from the arm-smmu driver's probe as with this enabled the hardware tries to throttle invalidations from 'non-real-time clients', such as USB and UFS. For detailed information please refer to patch [3/4] in this series. I have included the device tree patch too in this series for someone who would like to test out this. Here's a branch [2] that gets display on MTP SDM845 device. This patch series is inspired from downstream work to handle under-performance issues on real-time clients on sdm845. In downstream we add separate page table ops to handle TLB maintenance and toggle wait-for-safe in tlb_sync call so that achieve required performance for display and camera [3, 4]. Changes since v4: * Addressed Stephen's comments. * Moved QCOM specific implementation to arm-smmu-qcom.c as per Robin's suggestion. Changes since v3: * Based on arm-smmu implementation cleanup series [5] by Robin Murphy which is already merged in Will's tree [6]. * Implemented the sdm845 specific reset hook which does arm_smmu_device_reset() followed by making SCM call to disable the wait-for-safe logic. * Removed depedency for SCM call on any dt flag. We invariably try to disable the wait-for-safe logic on sdm845. The platforms such as mtp845, and db845 that implement handlers for this particular SCM call should be able disable wait-for-safe logic. Other platforms such as cheza don't enable the wait-for-safe logic at all from their bootloaders. So there's no need to disable the same. * No change in SCM call patches 1 & 2. Changes since v2: * Dropped the patch to add atomic io_read/write scm API. * Removed support for any separate page table ops to handle wait-for-safe. Currently just disabling this wait-for-safe logic from arm_smmu_device_probe() to achieve performance on USB/UFS on sdm845. * Added a device tree patch to add smmu option for fw-implemented support for SCM call to take care of SAFE toggling. Changes since v1: * Addressed Will and Robin's comments: - Dropped the patch[4] that forked out __arm_smmu_tlb_inv_range_nosync(), and __arm_smmu_tlb_sync(). - Cleaned up the errata patch further to use downstream polling mechanism for tlb sync. * No change in SCM call patches - patches 1 to 3. [1] https://patchwork.kernel.org/cover/11110643/ [2] https://github.com/vivekgautam1/linux/tree/v5.2-rc4/sdm845-display-working [3] https://source.codeaurora.org/quic/la/kernel/msm-4.9/commit/drivers/iommu/arm-smmu.c?h=CogSystems-msm-49/msm-4.9&id=da765c6c75266b38191b38ef086274943f353ea7 [4] https://source.codeaurora.org/quic/la/kernel/msm-4.9/commit/drivers/iommu/arm-smmu.c?h=CogSystems-msm-49/msm-4.9&id=8696005aaaf745de68f57793c1a534a34345c30a [5] https://patchwork.kernel.org/patch/11096265/ [6] https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/ Vivek Gautam (3): firmware: qcom_scm-64: Add atomic version of qcom_scm_call firmware/qcom_scm: Add scm call to handle smmu errata iommu: arm-smmu-impl: Add sdm845 implementation hook drivers/firmware/qcom_scm-32.c | 5 ++ drivers/firmware/qcom_scm-64.c | 152 +++++++++++++++++++++++---------- drivers/firmware/qcom_scm.c | 6 ++ drivers/firmware/qcom_scm.h | 5 ++ drivers/iommu/Makefile | 2 +- drivers/iommu/arm-smmu-impl.c | 7 +- drivers/iommu/arm-smmu-qcom.c | 32 +++++++ drivers/iommu/arm-smmu-qcom.h | 11 +++ drivers/iommu/arm-smmu.h | 2 + include/linux/qcom_scm.h | 2 + 10 files changed, 177 insertions(+), 47 deletions(-) create mode 100644 drivers/iommu/arm-smmu-qcom.c create mode 100644 drivers/iommu/arm-smmu-qcom.h -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation