Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753240AbdGULmI (ORCPT ); Fri, 21 Jul 2017 07:42:08 -0400 Received: from foss.arm.com ([217.140.101.70]:35210 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750737AbdGULmH (ORCPT ); Fri, 21 Jul 2017 07:42:07 -0400 From: Robin Murphy To: joro@8bytes.org Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dwmw2@infradead.org, thunder.leizhen@huawei.com, lorenzo.pieralisi@arm.com, ard.biesheuvel@linaro.org, Jonathan.Cameron@huawei.com, nwatters@codeaurora.org, ray.jui@broadcom.com Subject: [PATCH v2 0/4] Optimise 64-bit IOVA allocations Date: Fri, 21 Jul 2017 12:41:57 +0100 Message-Id: X-Mailer: git-send-email 2.12.2.dirty Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1742 Lines: 45 Hi all, In the wake of the ARM SMMU optimisation efforts, it seems that certain workloads (e.g. storage I/O with large scatterlists) probably remain quite heavily influenced by IOVA allocation performance. Separately, Ard also reported massive performance drops for a graphical desktop on AMD Seattle when enabling SMMUs via IORT, which we traced to dma_32bit_pfn in the DMA ops domain getting initialised differently for ACPI vs. DT, and exposing the overhead of the rbtree slow path. Whilst we could go around trying to close up all the little gaps that lead to hitting the slowest case, it seems a much better idea to simply make said slowest case a lot less slow. I had a go at rebasing Leizhen's last IOVA series[1], but ended up finding the changes rather too hard to follow, so I've taken the liberty here of picking the whole thing up and reimplementing the main part in a rather less invasive manner. Robin. Changes from v1: - Fix overflow with 32-bit dma_addr_t - Add tested-bys [1] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg17753.html Robin Murphy (1): iommu/iova: Extend rbtree node caching Zhen Lei (3): iommu/iova: Optimise rbtree searching iommu/iova: Optimise the padding calculation iommu/iova: Make dma_32bit_pfn implicit drivers/gpu/drm/tegra/drm.c | 3 +- drivers/gpu/host1x/dev.c | 3 +- drivers/iommu/amd_iommu.c | 7 +-- drivers/iommu/dma-iommu.c | 18 +------ drivers/iommu/intel-iommu.c | 11 ++-- drivers/iommu/iova.c | 112 ++++++++++++++++----------------------- drivers/misc/mic/scif/scif_rma.c | 3 +- include/linux/iova.h | 8 +-- 8 files changed, 60 insertions(+), 105 deletions(-) -- 2.12.2.dirty