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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 3851DC43603 for ; Tue, 10 Dec 2019 21:14:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 014BB205C9 for ; Tue, 10 Dec 2019 21:14:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576012483; bh=2G+Ssin6Hdyto20sFdPBX7wJMIBffV857m+HMbLO2LM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ySVDeLDX6HtvihAf7bX6E6cgT9bfDysuSO5J2qMwrJZC7yH2dQ4xjVwLE4dgMLcvW x7xHZ7Jg01s4dXyTeT05QkVMLLQjPgfHFOesl3Ht8Sm4nwAb73AlAKNBLkTu3X6i9F 7ltpNnvwAKdSdC0V61RYlx8iKudQ8GFRtkYce6m8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729456AbfLJVNt (ORCPT ); Tue, 10 Dec 2019 16:13:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:40398 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729412AbfLJVNn (ORCPT ); Tue, 10 Dec 2019 16:13:43 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ED91222B48; Tue, 10 Dec 2019 21:13:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576012422; bh=2G+Ssin6Hdyto20sFdPBX7wJMIBffV857m+HMbLO2LM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mNx/VThqi5A+XxPcWQGsv/f5JTeXPhUAVnIb6gM1jI8oQ1Lbldg+WdDgOPvgBJaoC c2hy7PCZVDLOEoZyhoArT/qvBf2n3G32lLUiEoZ2FO4cZvDnLEbstDNDHWfr30LyYK RUMABBRUR+8wEt5astdGCfeLO42KO6y1epdFvtUg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sam Bobroff , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.4 337/350] drm/amdgpu: fix bad DMA from INTERRUPT_CNTL2 Date: Tue, 10 Dec 2019 16:07:22 -0500 Message-Id: <20191210210735.9077-298-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210210735.9077-1-sashal@kernel.org> References: <20191210210735.9077-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sam Bobroff [ Upstream commit 3d0e3ce52ce3eb4b9de3caf9c38dbb5a4d3e13c3 ] The INTERRUPT_CNTL2 register expects a valid DMA address, but is currently set with a GPU MC address. This can cause problems on systems that detect the resulting DMA read from an invalid address (found on a Power8 guest). Instead, use the DMA address of the dummy page because it will always be safe. Fixes: 27ae10641e9c ("drm/amdgpu: add interupt handler implementation for si v3") Signed-off-by: Sam Bobroff Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/si_ih.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/si_ih.c b/drivers/gpu/drm/amd/amdgpu/si_ih.c index 57bb5f9e08b2d..88ae27a5a03db 100644 --- a/drivers/gpu/drm/amd/amdgpu/si_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/si_ih.c @@ -64,7 +64,8 @@ static int si_ih_irq_init(struct amdgpu_device *adev) u32 interrupt_cntl, ih_cntl, ih_rb_cntl; si_ih_disable_interrupts(adev); - WREG32(INTERRUPT_CNTL2, adev->irq.ih.gpu_addr >> 8); + /* set dummy read address to dummy page address */ + WREG32(INTERRUPT_CNTL2, adev->dummy_page_addr >> 8); interrupt_cntl = RREG32(INTERRUPT_CNTL); interrupt_cntl &= ~IH_DUMMY_RD_OVERRIDE; interrupt_cntl &= ~IH_REQ_NONSNOOP_EN; -- 2.20.1