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 D7CEFC32771 for ; Fri, 24 Jan 2020 09:42:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A8923208C4 for ; Fri, 24 Jan 2020 09:42:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579858976; bh=ZHOO+mtHPwcjT/hj3xSjBBvbJ0VS5tMWFZ5u2RXM/LA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mzdb7RWhFJp4ggGAvy1gWkNzU9lvJvVdXyDDEulKYp0A6EHiGs84wPnXo2KwYpywU g9n2IrCQIR2o5x7uzfZlxwneR8uNq4vSZWrNtKaHFufHm9b5KBj1g/P4awMO6dWrwx Xn4nEerKzXMSCJmuCxJl7yC6gNEIVhTeWVwQwZ7k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733162AbgAXJmz (ORCPT ); Fri, 24 Jan 2020 04:42:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:40706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733158AbgAXJmz (ORCPT ); Fri, 24 Jan 2020 04:42:55 -0500 Received: from localhost (unknown [145.15.244.15]) (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 E22B220718; Fri, 24 Jan 2020 09:42:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579858974; bh=ZHOO+mtHPwcjT/hj3xSjBBvbJ0VS5tMWFZ5u2RXM/LA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yTsZcJptCHcWQoQE7sklizhPu+dTd7wuT+GnaVO0BLITAJJOXCsOwwJrbxlz1zh07 eenfC/8MFVR3YhR/gKFQw8Wvy8QTLRPmiFLBWrCs1UdiKRqOzJHNsUTrkjbv8bnM9l eZHOFUbAaCxcdBwEe7us1ToPeG+lg5/XIK26u4TY= 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 5.4 094/102] drm/radeon: fix bad DMA from INTERRUPT_CNTL2 Date: Fri, 24 Jan 2020 10:31:35 +0100 Message-Id: <20200124092820.909781492@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124092806.004582306@linuxfoundation.org> References: <20200124092806.004582306@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 62eab82a64f97..897442754fd03 100644 --- a/drivers/gpu/drm/radeon/cik.c +++ b/drivers/gpu/drm/radeon/cik.c @@ -6969,8 +6969,8 @@ 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 e937cc01910d9..033bc466a862a 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3696,8 +3696,8 @@ 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 05894d198a798..1d8efb0eefdb4 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -5997,8 +5997,8 @@ 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