From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756436AbcI0Uti (ORCPT ); Tue, 27 Sep 2016 16:49:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52118 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756181AbcI0UtJ (ORCPT ); Tue, 27 Sep 2016 16:49:09 -0400 From: Eric Auger To: eric.auger@redhat.com, eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org Cc: kvm@vger.kernel.org, drjones@redhat.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, pranav.sawargaonkar@gmail.com, p.fedin@samsung.com, iommu@lists.linux-foundation.org, Jean-Philippe.Brucker@arm.com, yehuday@marvell.com, Manish.Jaggi@caviumnetworks.com Subject: [RFC 03/11] iommu: Introduce IOMMU_DOMAIN_MIXED Date: Tue, 27 Sep 2016 20:48:30 +0000 Message-Id: <1475009318-2617-4-git-send-email-eric.auger@redhat.com> In-Reply-To: <1475009318-2617-1-git-send-email-eric.auger@redhat.com> References: <1475009318-2617-1-git-send-email-eric.auger@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Tue, 27 Sep 2016 20:49:09 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We introduce a new IOMMU domain type, dubbed IOMMU_DOMAIN_MIXED. It is bound to be used as a replacement of IOMMU_DOMAIN_UNMANAGED when the IOMMU translates MSI addresses. Such domain hosts "unmanaged" reserved IOVA ranges chosen by the iommu-api user, dished out as part of alloc_iova. Rest if available for internal iova needs such as MSI frame IOVA allocation. Signed-off-by: Eric Auger --- include/linux/iommu.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5c2673a..44fe213 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -62,6 +62,9 @@ struct iommu_domain_msi_geometry { #define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API implementation */ #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ +#define __IOMMU_DOMAIN_MIXED (1U << 3) /* Domain mixing unmanaged and + * managed IOVAS + */ /* * This are the possible domain-types @@ -71,6 +74,9 @@ struct iommu_domain_msi_geometry { * IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses * IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used * for VMs + * IOMMU_DOMAIN_MIXED - Most DMA mappings are managed by IOMMU-API + * users and holes are left available for + internal use such as MSI frame IOVA allocation * IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations. * This flag allows IOMMU drivers to implement * certain optimizations for these domains @@ -80,6 +86,9 @@ struct iommu_domain_msi_geometry { #define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING) #define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \ __IOMMU_DOMAIN_DMA_API) +#define IOMMU_DOMAIN_MIXED (__IOMMU_DOMAIN_MIXED | \ + __IOMMU_DOMAIN_PAGING | \ + __IOMMU_DOMAIN_DMA_API) struct iommu_domain { unsigned type; -- 1.9.1