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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 950DBC4363C for ; Wed, 12 May 2021 16:53:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F68A611AC for ; Wed, 12 May 2021 16:53:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343719AbhELQx0 (ORCPT ); Wed, 12 May 2021 12:53:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:34658 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233998AbhELPxJ (ORCPT ); Wed, 12 May 2021 11:53:09 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2590661A14; Wed, 12 May 2021 15:26:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620833218; bh=/HFZBa4NDhyO9sJC0ZsrlCg/ZooKNMtoOTPTowbnQFc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qM7tSNqhMQ7XIHpTEE39lZnW4m/F6nTTA5B78k5S2723ytYopNHsxf/JXDL3oiei8 dtHEA/MlYryL8ZpAUuwsNBW8OaoBivqViRM6lJxEGTpq+6odb7VEB8Idd0j4uL7hlF pqepW34DMzUHu9yifW6MYrvMwxtKT1jnjp8UIIvg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Boris Brezillon , Steven Price Subject: [PATCH 5.11 064/601] drm/panfrost: Clear MMU irqs before handling the fault Date: Wed, 12 May 2021 16:42:21 +0200 Message-Id: <20210512144829.924013404@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Boris Brezillon commit 3aa0a80fc692c9959c261f4c5bfe9c23ddd90562 upstream. When a fault is handled it will unblock the GPU which will continue executing its shader and might fault almost immediately on a different page. If we clear interrupts after handling the fault we might miss new faults, so clear them before. Cc: Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations") Signed-off-by: Boris Brezillon Reviewed-by: Steven Price Link: https://patchwork.freedesktop.org/patch/msgid/20210205111757.585248-2-boris.brezillon@collabora.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/panfrost/panfrost_mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -593,6 +593,8 @@ static irqreturn_t panfrost_mmu_irq_hand access_type = (fault_status >> 8) & 0x3; source_id = (fault_status >> 16); + mmu_write(pfdev, MMU_INT_CLEAR, mask); + /* Page fault only */ ret = -1; if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0) @@ -616,8 +618,6 @@ static irqreturn_t panfrost_mmu_irq_hand access_type, access_type_name(pfdev, fault_status), source_id); - mmu_write(pfdev, MMU_INT_CLEAR, mask); - status &= ~mask; }