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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 27A09C35240 for ; Tue, 28 Jan 2020 14:14:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2B45246A3 for ; Tue, 28 Jan 2020 14:14:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220899; bh=MZCeFH3/ZgirqDOHvX84LoqvRuoZtRFg7XS13nRFhF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xEqn9Re1lmFmZeOWGoctaDdQSOx5JuB2q8qzr0Kw28YMxb1F90DxOrmy6WPV/E9Tj 3nPyuoKoFiClPtEUTYLAEK72i249ELg5Lbw7Vw5xP8bMRXiyb0LVnKNt9b7HQyssS7 p56CnVD5Hgut3xAJ6OO7gUnY2fPWGEx8nMuD4WP0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729975AbgA1OOy (ORCPT ); Tue, 28 Jan 2020 09:14:54 -0500 Received: from mail.kernel.org ([198.145.29.99]:37188 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729965AbgA1OOw (ORCPT ); Tue, 28 Jan 2020 09:14:52 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7A44024681; Tue, 28 Jan 2020 14:14:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220890; bh=MZCeFH3/ZgirqDOHvX84LoqvRuoZtRFg7XS13nRFhF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZICSKNeO5aw1AdjG3MlgmTRjIkjxGOdtRYbhxuup1BwYHsgAO+05/+ZbL57r5qIQc jgF1/pTSebG1oIhTb1jNfHGyYsKpqxRb2IsLWkAMIVGr8PkObQ68A4DyXM1bYhmqTE MYB5sJOSw/zE9BmvK0GFMTrN3+AvL7Fh38PIOBxo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sam Bobroff , Alex Deucher , Sasha Levin Subject: [PATCH 4.4 157/183] drm/radeon: fix bad DMA from INTERRUPT_CNTL2 Date: Tue, 28 Jan 2020 15:06:16 +0100 Message-Id: <20200128135845.416012863@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135829.486060649@linuxfoundation.org> References: <20200128135829.486060649@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 62d91dd2851e8ae2ca552f1b090a3575a4edf759 ] 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: d8f60cfc9345 ("drm/radeon/kms: Add support for interrupts on r6xx/r7xx chips (v3)") Fixes: 25a857fbe973 ("drm/radeon/kms: add support for interrupts on SI") Fixes: a59781bbe528 ("drm/radeon: add support for interrupts on CIK (v5)") Signed-off-by: Sam Bobroff Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/radeon/cik.c | 4 ++-- drivers/gpu/drm/radeon/r600.c | 4 ++-- drivers/gpu/drm/radeon/si.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c index 80b6d6e4721a1..7acde09c8e8fb 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -7372,8 +7372,8 @@ static int cik_irq_init(struct radeon_device *rdev) } /* setup interrupt control */ - /* XXX this should actually be a bus address, not an MC address. same on older asics */ - WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8); + /* set dummy read address to dummy page address */ + WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8); interrupt_cntl = RREG32(INTERRUPT_CNTL); /* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi * IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 0e20c08f8977f..2056224d0b3c4 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3647,8 +3647,8 @@ int r600_irq_init(struct radeon_device *rdev) } /* setup interrupt control */ - /* set dummy read address to ring address */ - WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8); + /* set dummy read address to dummy page address */ + WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8); interrupt_cntl = RREG32(INTERRUPT_CNTL); /* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi * IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index 5cf3a2cbc07e8..4128c98d9054e 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -6013,8 +6013,8 @@ static int si_irq_init(struct radeon_device *rdev) } /* setup interrupt control */ - /* set dummy read address to ring address */ - WREG32(INTERRUPT_CNTL2, rdev->ih.gpu_addr >> 8); + /* set dummy read address to dummy page address */ + WREG32(INTERRUPT_CNTL2, rdev->dummy_page.addr >> 8); interrupt_cntl = RREG32(INTERRUPT_CNTL); /* IH_DUMMY_RD_OVERRIDE=0 - dummy read disabled with msi, enabled without msi * IH_DUMMY_RD_OVERRIDE=1 - dummy read controlled by IH_DUMMY_RD_EN -- 2.20.1