From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.7 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 43DDA7D2EF for ; Thu, 13 Jun 2019 16:11:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388905AbfFMQLU (ORCPT ); Thu, 13 Jun 2019 12:11:20 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:18565 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731238AbfFMInd (ORCPT ); Thu, 13 Jun 2019 04:43:33 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id E75AE9BFC10B89B23C95; Thu, 13 Jun 2019 16:43:30 +0800 (CST) Received: from HGHY4L002753561.china.huawei.com (10.133.215.186) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.439.0; Thu, 13 Jun 2019 16:43:21 +0800 From: Zhen Lei To: Jean-Philippe Brucker , John Garry , Robin Murphy , Will Deacon , Joerg Roedel , Jonathan Corbet , linux-doc , Sebastian Ott , Gerald Schaefer , "Martin Schwidefsky" , Heiko Carstens , Benjamin Herrenschmidt , Paul Mackerras , "Michael Ellerman" , Tony Luck , Fenghua Yu , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , David Woodhouse , iommu , linux-kernel , linux-s390 , linuxppc-dev , x86 , linux-ia64 CC: Zhen Lei Subject: [PATCH v9 3/7] s390/pci: add support for IOMMU default DMA mode build options Date: Thu, 13 Jun 2019 16:42:36 +0800 Message-ID: <20190613084240.16768-4-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.21.0.windows.1 In-Reply-To: <20190613084240.16768-1-thunder.leizhen@huawei.com> References: <20190613084240.16768-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.133.215.186] X-CFilter-Loop: Reflected Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org The default DMA mode is LAZY on s390, this patch make it can be set to STRICT at build time. It can be overridden by boot option. There is no functional change. Signed-off-by: Zhen Lei Acked-by: Sebastian Ott --- arch/s390/pci/pci_dma.c | 2 +- drivers/iommu/Kconfig | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 9e52d1527f71495..784ad1e0acecfb1 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -17,7 +17,7 @@ static struct kmem_cache *dma_region_table_cache; static struct kmem_cache *dma_page_table_cache; -static int s390_iommu_strict; +static int s390_iommu_strict = IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); static int zpci_refresh_global(struct zpci_dev *zdev) { diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index fe715fb295c6ed2..a8dd69d175fb3c6 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -78,6 +78,7 @@ config IOMMU_DEBUGFS choice prompt "IOMMU default DMA mode" depends on IOMMU_API + default IOMMU_DEFAULT_LAZY if S390_IOMMU default IOMMU_DEFAULT_STRICT help This option allows an IOMMU DMA mode to be chosen at build time, to @@ -89,6 +90,7 @@ choice config IOMMU_DEFAULT_PASSTHROUGH bool "passthrough" + depends on !S390_IOMMU help In this mode, the DMA access through IOMMU without any addresses translation. That means, the wrong or illegal DMA access can not -- 1.8.3