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=-4.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,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 E93C1C33CAF for ; Thu, 16 Jan 2020 23:26:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC6612072B for ; Thu, 16 Jan 2020 23:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579217216; bh=+dZn9ctE138WMg1kLqSqJmFRkxgqEg6ORbpxtBctrvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NzS32+38wKTfD79fq4TIXmN++OtNNhwiG2LVvdI1QKwgHa0L9j+jebE1K2ruDL+N8 DqG67P4Ffd0TB4v93ilaDwSSWGzxJvwVqGI+i76SJIt3KPt4w+JHmE7xrT4872QkWA ISYdra9OkdgrqLhCGyAApjuO7SsZ0ERwnKuIf9gw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389644AbgAPX0z (ORCPT ); Thu, 16 Jan 2020 18:26:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:57106 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730387AbgAPX0b (ORCPT ); Thu, 16 Jan 2020 18:26:31 -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 E8CEF20684; Thu, 16 Jan 2020 23:26:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579217190; bh=+dZn9ctE138WMg1kLqSqJmFRkxgqEg6ORbpxtBctrvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e2bWOL6Fh+CaM3Z2+6PNkBlz8yNro10dY0U9zr/E3fgwFNmOrfkZQaK2KUYymwvvF 9kabpXoU4gzqXh+cq8jY5Hn//DIzvkP4E405CSGZM8eE4rPUOHd2XZ9QYzEt3kJq0f f9lS4RRvicVGctG1t5bDwICDlQVyiJnc7F4Pn8zs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yong Wu , Joerg Roedel Subject: [PATCH 5.4 160/203] iommu/mediatek: Add a new tlb_lock for tlb_flush Date: Fri, 17 Jan 2020 00:17:57 +0100 Message-Id: <20200116231758.732127675@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200116231745.218684830@linuxfoundation.org> References: <20200116231745.218684830@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: Yong Wu commit da3cc91b8db403728cde03c8a95cba268d8cbf1b upstream. The commit 4d689b619445 ("iommu/io-pgtable-arm-v7s: Convert to IOMMU API TLB sync") help move the tlb_sync of unmap from v7s into the iommu framework. It helps add a new function "mtk_iommu_iotlb_sync", But it lacked the lock, then it will cause the variable "tlb_flush_active" may be changed unexpectedly, we could see this warning log randomly: mtk-iommu 10205000.iommu: Partial TLB flush timed out, falling back to full flush The HW requires tlb_flush/tlb_sync in pairs strictly, this patch adds a new tlb_lock for tlb operations to fix this issue. Fixes: 4d689b619445 ("iommu/io-pgtable-arm-v7s: Convert to IOMMU API TLB sync") Signed-off-by: Yong Wu Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/mtk_iommu.c | 23 ++++++++++++++++++++++- drivers/iommu/mtk_iommu.h | 1 + 2 files changed, 23 insertions(+), 1 deletion(-) --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -219,22 +219,37 @@ static void mtk_iommu_tlb_sync(void *coo static void mtk_iommu_tlb_flush_walk(unsigned long iova, size_t size, size_t granule, void *cookie) { + struct mtk_iommu_data *data = cookie; + unsigned long flags; + + spin_lock_irqsave(&data->tlb_lock, flags); mtk_iommu_tlb_add_flush_nosync(iova, size, granule, false, cookie); mtk_iommu_tlb_sync(cookie); + spin_unlock_irqrestore(&data->tlb_lock, flags); } static void mtk_iommu_tlb_flush_leaf(unsigned long iova, size_t size, size_t granule, void *cookie) { + struct mtk_iommu_data *data = cookie; + unsigned long flags; + + spin_lock_irqsave(&data->tlb_lock, flags); mtk_iommu_tlb_add_flush_nosync(iova, size, granule, true, cookie); mtk_iommu_tlb_sync(cookie); + spin_unlock_irqrestore(&data->tlb_lock, flags); } static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather, unsigned long iova, size_t granule, void *cookie) { + struct mtk_iommu_data *data = cookie; + unsigned long flags; + + spin_lock_irqsave(&data->tlb_lock, flags); mtk_iommu_tlb_add_flush_nosync(iova, granule, granule, true, cookie); + spin_unlock_irqrestore(&data->tlb_lock, flags); } static const struct iommu_flush_ops mtk_iommu_flush_ops = { @@ -453,7 +468,12 @@ static void mtk_iommu_flush_iotlb_all(st static void mtk_iommu_iotlb_sync(struct iommu_domain *domain, struct iommu_iotlb_gather *gather) { - mtk_iommu_tlb_sync(mtk_iommu_get_m4u_data()); + struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); + unsigned long flags; + + spin_lock_irqsave(&data->tlb_lock, flags); + mtk_iommu_tlb_sync(data); + spin_unlock_irqrestore(&data->tlb_lock, flags); } static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, @@ -733,6 +753,7 @@ static int mtk_iommu_probe(struct platfo if (ret) return ret; + spin_lock_init(&data->tlb_lock); list_add_tail(&data->list, &m4ulist); if (!iommu_present(&platform_bus_type)) --- a/drivers/iommu/mtk_iommu.h +++ b/drivers/iommu/mtk_iommu.h @@ -58,6 +58,7 @@ struct mtk_iommu_data { struct iommu_group *m4u_group; bool enable_4GB; bool tlb_flush_active; + spinlock_t tlb_lock; /* lock for tlb range flush */ struct iommu_device iommu; const struct mtk_iommu_plat_data *plat_data;