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=-13.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,USER_AGENT_GIT autolearn=ham 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 AA95DC43610 for ; Tue, 20 Nov 2018 09:55:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74280208E4 for ; Tue, 20 Nov 2018 09:55:12 +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="d7lOWIXJ"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="aX5BEFpf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 74280208E4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728085AbeKTUX0 (ORCPT ); Tue, 20 Nov 2018 15:23:26 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:56892 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727131AbeKTUX0 (ORCPT ); Tue, 20 Nov 2018 15:23:26 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 0023D607DC; Tue, 20 Nov 2018 09:55:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542707710; bh=sBbu+0gGeDeVTUJHEDPT+DUyuG8owCDgrf9Y2yTAucc=; h=From:To:Cc:Subject:Date:From; b=d7lOWIXJMyO6EDDvJH3OynMWI7HzNvw5o/KtXRgWpt7IcnnKoyu7MZ7Utz/AOkaAz nNiUBfuWM+cAaw8+GQLQVPBTPEmwvlyQ6CJ+BYmIevpzr3FsjlnXK7AbRtK3M6QGlS qyyOnAT7ETEsipT7Hl0Yu9/F4s9ebqdfWT0WDqFk= Received: from blr-ubuntu-41.ap.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: vivek.gautam@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 4FA38607DC; Tue, 20 Nov 2018 09:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542707709; bh=sBbu+0gGeDeVTUJHEDPT+DUyuG8owCDgrf9Y2yTAucc=; h=From:To:Cc:Subject:Date:From; b=aX5BEFpfgvhPappPDG6/snNbc8YlyfJSyMJu95j2BmSmlaPSqpuA5awMNjRHpLTov OirFX6HKbgj9rk+HLWdh9ZH2LBCJZvyp4ZQjsnRszQYsIDsmD/hCExJGork+LwjQ3e BpIkHyhr/+XVm4zhgEkIV65NOeQm4bKLiB0TuM/0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4FA38607DC 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=vivek.gautam@codeaurora.org From: Vivek Gautam To: robdclark@gmail.com, airlied@linux.ie Cc: linux-kernel@vger.kernel.org, freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, tfiga@chromium.org, jcrouse@codeaurora.org, Vivek Gautam Subject: [PATCH 1/1] drm: msm: Replace dma_map_sg with dma_sync_sg* Date: Tue, 20 Nov 2018 15:24:37 +0530 Message-Id: <20181120095437.29820-1-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 2.16.1.72.g5be1f00a9a70 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org dma_map_sg() expects a DMA domain. However, the drm devices have been traditionally using unmanaged iommu domain which is non-dma type. Using dma mapping APIs with that domain is bad. Replace dma_map_sg() calls with dma_sync_sg_for_device{|cpu}() to do the cache maintenance. Signed-off-by: Vivek Gautam Suggested-by: Tomasz Figa --- Tested on an MTP sdm845: https://github.com/vivekgautam1/linux/tree/v4.19/sdm845-mtp-display-working drivers/gpu/drm/msm/msm_gem.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 00c795ced02c..d7a7af610803 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -81,6 +81,8 @@ static struct page **get_pages(struct drm_gem_object *obj) struct drm_device *dev = obj->dev; struct page **p; int npages = obj->size >> PAGE_SHIFT; + struct scatterlist *s; + int i; if (use_pages(obj)) p = drm_gem_get_pages(obj); @@ -107,9 +109,19 @@ static struct page **get_pages(struct drm_gem_object *obj) /* For non-cached buffers, ensure the new pages are clean * because display controller, GPU, etc. are not coherent: */ - if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) - dma_map_sg(dev->dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + if (msm_obj->flags & (MSM_BO_WC | MSM_BO_UNCACHED)) { + /* + * Fake up the SG table so that dma_sync_sg_*() + * can be used to flush the pages associated with it. + */ + for_each_sg(msm_obj->sgt->sgl, s, + msm_obj->sgt->nents, i) + sg_dma_address(s) = sg_phys(s); + + dma_sync_sg_for_device(dev->dev, msm_obj->sgt->sgl, + msm_obj->sgt->nents, + DMA_TO_DEVICE); + } } return msm_obj->pages; @@ -137,10 +149,11 @@ static void put_pages(struct drm_gem_object *obj) * pages are clean because display controller, * GPU, etc. are not coherent: */ - if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) - dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl, - msm_obj->sgt->nents, - DMA_BIDIRECTIONAL); + if (msm_obj->flags & (MSM_BO_WC | MSM_BO_UNCACHED)) + dma_sync_sg_for_cpu(obj->dev->dev, + msm_obj->sgt->sgl, + msm_obj->sgt->nents, + DMA_FROM_DEVICE); sg_free_table(msm_obj->sgt); kfree(msm_obj->sgt); -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation