Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752744AbdHQM45 (ORCPT ); Thu, 17 Aug 2017 08:56:57 -0400 Received: from 8bytes.org ([81.169.241.247]:43216 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750988AbdHQM4z (ORCPT ); Thu, 17 Aug 2017 08:56:55 -0400 From: Joerg Roedel To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Suravee Suthikulpanit , Joerg Roedel Subject: [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface Date: Thu, 17 Aug 2017 14:56:23 +0200 Message-Id: <1502974596-23835-1-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3271 Lines: 77 Hi, here is a patch-set to introduce an explicit interface to the IOMMU-API to flush IOMMU and device IO/TLBs. Currently the iommu_map(), iommu_map_sg(), and iommu_unmap() functions have to make sure all IO/TLBs in the system are synchronized with the page-table updates they made. This is very inefficient in some scenarios, for example when a large address space is unmapped and an IO/TLB flush has to be done in every call of iommu_unmap(). Or in a scenario where it makes sense to queue up some changes to the page-tables and flush them together. To optimize these scenarios, the need to synchronize with the IOMMU and device TLBs has been removed from the map/unmap functions of the IOMMU-API and an interface to explicitly do the flushes has been introduced. To make the conversion of existing users of the IOMMU-API easier, new functions - iommu_map_sync(), iommu_map_sg_sync(), and iommu_unmap_sync() - have been introduced. These functions guarantee that the IO/TLBs are synchronized with any page-table update when they return. The optimizations possible with the new interface are subject to separate patch-sets. Patch 1 just renames a few functions in the AMD-Vi driver that would otherwise collide with the new TLB-flush functions from the IOMMU-API. Patch 2 introduces the new IO/TLB Flush-Interface. Patch 3-13 convert existing users of the IOMMU-API to use the *_sync functions for now. Please review. Thanks, Joerg Joerg Roedel (13): iommu/amd: Rename a few flush functions iommu: Introduce Interface for IOMMU TLB Flushing vfio/type1: Use sychronized interface of the IOMMU-API iommu/dma: Use sychronized interface of the IOMMU-API arm: dma-mapping: Use sychronized interface of the IOMMU-API drm/etnaviv: Use sychronized interface of the IOMMU-API drm/msm: Use sychronized interface of the IOMMU-API drm/nouveau/imem/gk20a: Use sychronized interface of the IOMMU-API drm/rockchip: Use sychronized interface of the IOMMU-API drm/tegra: Use sychronized interface of the IOMMU-API gpu: host1x: Use sychronized interface of the IOMMU-API IB/usnic: Use sychronized interface of the IOMMU-API remoteproc: Use sychronized interface of the IOMMU-API arch/arm/mm/dma-mapping.c | 21 +++--- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 10 +-- drivers/gpu/drm/msm/msm_iommu.c | 5 +- .../gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | 12 ++-- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 6 +- drivers/gpu/drm/tegra/drm.c | 6 +- drivers/gpu/drm/tegra/gem.c | 6 +- drivers/gpu/host1x/cdma.c | 6 +- drivers/gpu/host1x/job.c | 6 +- drivers/infiniband/hw/usnic/usnic_uiom.c | 10 +-- drivers/iommu/amd_iommu.c | 16 ++--- drivers/iommu/dma-iommu.c | 8 +-- drivers/iommu/iommu.c | 26 +++++++ drivers/remoteproc/remoteproc_core.c | 10 +-- drivers/vfio/vfio_iommu_type1.c | 38 +++++----- include/linux/iommu.h | 80 +++++++++++++++++++++- 16 files changed, 189 insertions(+), 77 deletions(-) -- 2.7.4