From patchwork Wed Dec 30 15:29:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Iskren Chernev X-Patchwork-Id: 11993967 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=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 62AA1C433E0 for ; Thu, 31 Dec 2020 10:42:41 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 24C8C223E0 for ; Thu, 31 Dec 2020 10:42:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 24C8C223E0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ED87189B57; Thu, 31 Dec 2020 10:42:38 +0000 (UTC) Received: from mail-ed1-x531.google.com (mail-ed1-x531.google.com [IPv6:2a00:1450:4864:20::531]) by gabe.freedesktop.org (Postfix) with ESMTPS id 420AC89807; Wed, 30 Dec 2020 15:30:33 +0000 (UTC) Received: by mail-ed1-x531.google.com with SMTP id r5so15686686eda.12; Wed, 30 Dec 2020 07:30:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GpHHXsZUYQJKAsXY+fqmwPRImq5uvJodDxQThHKttC8=; b=uHIwWiQAgZJcuQerW7aZxpUYvAFOTwmZvcXoZiU49CUjjuA1rz+nOdAJEHkixngy/d DsQZPLJV7kupiV7lpp0NWXiS703qBfxVdzMtFIzpHyEcr6u+PVS4o8Fg0v89I9ylqmy0 GYL53UmVqN4xU3ZSbBLljt5TlDbhTuunuf7Czmz+s3yDW1p0XKcxRQM4ilaFq32NB2Qu NT1/sDY8saKYA0vLYexCb9SRLSKgXw3krKcevilTqBeDf7x2L0fUV3XaE/hFXBqOFcZA o1xR38gcWm29F7RUgOB8ozoWQzgae+yHxRe0HaHmA7vRDXgKo9sIJrr8kfyXlumRHzq5 A5lQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=GpHHXsZUYQJKAsXY+fqmwPRImq5uvJodDxQThHKttC8=; b=K25Zh5HLZHEbV+ptMnkkAkW5ltqtLDjoHtUj9P4/PYTigE+SFePV2BrpAEhON8BkPQ wG38oQhGyY0uCBn3oag2TB3DkJL71RzysrMbzgMgKM/8v6a7UDvwmEkEDM7X+rR3/Zys 9I9fi4Q6/yw8KALjTP+c56i0JJJkjd/ECdLx3TSKNfjSCPd6V/GuEyoJJ2Dfk6N63nnl 4RT7kMd3Pyebf9Aay/wH0Pmv5SFa1rAK8JklR9AsiKfzBM6yiq86+I9t8ovNQr0JcCxp rWwAKSwREyPSTLe3wTqlOcZRc4WtfxUIzzHrD8UK+SfXG7ZNQRB2ZRyFAlkDOuEHqVC5 M/IQ== X-Gm-Message-State: AOAM533KaYV73jJcMEqJUqNAGKMYZrgFykeu512VZWFUZ3zBq9SbqnBU 2VveFYjvJsh6jR+/ef0WFjY= X-Google-Smtp-Source: ABdhPJw23n3T+Ct/p+WPbtT9gStbrEMVVfK/XXEV42wVlsRLVTv/eR7cudEWmcjCEz6apzplIZfyMw== X-Received: by 2002:a50:b282:: with SMTP id p2mr52859676edd.210.1609342231950; Wed, 30 Dec 2020 07:30:31 -0800 (PST) Received: from localhost (178-169-161-196.razgrad.ddns.bulsat.com. [178.169.161.196]) by smtp.gmail.com with ESMTPSA id bo20sm38664655edb.1.2020.12.30.07.30.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Dec 2020 07:30:31 -0800 (PST) From: Iskren Chernev To: Rob Clark Subject: [PATCH 2/2] drm/msm: Add modparam to allow vram carveout Date: Wed, 30 Dec 2020 17:29:43 +0200 Message-Id: <20201230152944.3635488-2-iskren.chernev@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201230152944.3635488-1-iskren.chernev@gmail.com> References: <20201230152944.3635488-1-iskren.chernev@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 31 Dec 2020 10:42:13 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sean Paul , Wambui Karuga , Jonathan Marek , David Airlie , linux-arm-msm@vger.kernel.org, Sharat Masetty , Akhil P Oommen , dri-devel@lists.freedesktop.org, Bjorn Andersson , Iskren Chernev , ~postmarketos/upstreaming@lists.sr.ht, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Brian Masney Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Using the GPU with a VRAM Carveout is a security vulnerability. Nevertheless it is sometimes required, especially when no IOMMU implementation is available for a certain platform. Signed-off-by: Iskren Chernev --- drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 6 ++++-- drivers/gpu/drm/msm/adreno/adreno_device.c | 4 ++++ drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 + 5 files changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c index 7e82c41a85f1a..bdc989183c648 100644 --- a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c @@ -534,8 +534,10 @@ struct msm_gpu *a2xx_gpu_init(struct drm_device *dev) if (!gpu->aspace) { dev_err(dev->dev, "No memory protection without MMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } return gpu; diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c index 93da6683a8661..4534633fe7cdb 100644 --- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c @@ -564,8 +564,10 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev) * implement a cmdstream validator. */ DRM_DEV_ERROR(dev->dev, "No memory protection without IOMMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem"); diff --git a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c index c0be3a0f36b2c..82bebb40234de 100644 --- a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c @@ -692,8 +692,10 @@ struct msm_gpu *a4xx_gpu_init(struct drm_device *dev) * implement a cmdstream validator. */ DRM_DEV_ERROR(dev->dev, "No memory protection without IOMMU\n"); - ret = -ENXIO; - goto fail; + if (!allow_vram_carveout) { + ret = -ENXIO; + goto fail; + } } icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem"); diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c index 87c8b033ad1a6..12e75ba360f95 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_device.c +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c @@ -18,6 +18,10 @@ bool snapshot_debugbus = false; MODULE_PARM_DESC(snapshot_debugbus, "Include debugbus sections in GPU devcoredump (if not fused off)"); module_param_named(snapshot_debugbus, snapshot_debugbus, bool, 0600); +bool allow_vram_carveout = false; +MODULE_PARM_DESC(allow_vram_carveout, "Allow using VRAM Carveout, in place of IOMMU"); +module_param_named(allow_vram_carveout, allow_vram_carveout, bool, 0600); + static const struct adreno_info gpulist[] = { { .rev = ADRENO_REV(2, 0, 0, 0), diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h index c3775f79525a7..fe5444a1482ae 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h @@ -18,6 +18,7 @@ #include "adreno_pm4.xml.h" extern bool snapshot_debugbus; +extern bool allow_vram_carveout; enum { ADRENO_FW_PM4 = 0,