Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932797AbcKBRNF (ORCPT ); Wed, 2 Nov 2016 13:13:05 -0400 Received: from mga09.intel.com ([134.134.136.24]:15185 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932218AbcKBRNE (ORCPT ); Wed, 2 Nov 2016 13:13:04 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,583,1473145200"; d="scan'208";a="1054186375" Subject: [mm PATCH v2 00/26] Add support for DMA writable pages being writable by the network stack From: Alexander Duyck To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 02 Nov 2016 07:12:06 -0400 Message-ID: <20161102111031.79519.14741.stgit@ahduyck-blue-test.jf.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4913 Lines: 94 The first 22 patches in the set add support for the DMA attribute DMA_ATTR_SKIP_CPU_SYNC on multiple platforms/architectures. This is needed so that we can flag the calls to dma_map/unmap_page so that we do not invalidate cache lines that do not currently belong to the device. Instead we have to take care of this in the driver via a call to sync_single_range_for_cpu prior to freeing the Rx page. Patch 23 adds support for dma_map_page_attrs and dma_unmap_page_attrs so that we can unmap and map a page using the DMA_ATTR_SKIP_CPU_SYNC attribute. Patch 24 adds support for freeing a page that has multiple references being held by a single caller. This way we can free page fragments that were allocated by a given driver. The last 2 patches use these updates in the igb driver, and lay the groundwork to allow for us to reimpelement the use of build_skb. v1: Split out changes DMA_ERROR_CODE fix for swiotlb-xen Minor fixes based on issues found by kernel build bot Few minor changes for issues found on code review Added Acked-by for patches that were acked and not changed v2: Added a few more Acked-by Added swiotlb_unmap_sg to functions dropped in patch 1, dropped Acked-by Submitting patches to mm instead of net-next --- Alexander Duyck (26): swiotlb: Drop unused functions swiotlb_map_sg and swiotlb_unmap_sg swiotlb-xen: Enforce return of DMA_ERROR_CODE in mapping function swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC arch/arc: Add option to skip sync on DMA mapping arch/arm: Add option to skip sync on DMA map and unmap arch/avr32: Add option to skip sync on DMA map arch/blackfin: Add option to skip sync on DMA map arch/c6x: Add option to skip sync on DMA map and unmap arch/frv: Add option to skip sync on DMA map arch/hexagon: Add option to skip DMA sync as a part of mapping arch/m68k: Add option to skip DMA sync as a part of mapping arch/metag: Add option to skip DMA sync as a part of map and unmap arch/microblaze: Add option to skip DMA sync as a part of map and unmap arch/mips: Add option to skip DMA sync as a part of map and unmap arch/nios2: Add option to skip DMA sync as a part of map and unmap arch/openrisc: Add option to skip DMA sync as a part of mapping arch/parisc: Add option to skip DMA sync as a part of map and unmap arch/powerpc: Add option to skip DMA sync as a part of mapping arch/sh: Add option to skip DMA sync as a part of mapping arch/sparc: Add option to skip DMA sync as a part of map and unmap arch/tile: Add option to skip DMA sync as a part of map and unmap arch/xtensa: Add option to skip DMA sync as a part of mapping dma: Add calls for dma_map_page_attrs and dma_unmap_page_attrs mm: Add support for releasing multiple instances of a page igb: Update driver to make use of DMA_ATTR_SKIP_CPU_SYNC igb: Update code to better handle incrementing page count arch/arc/mm/dma.c | 5 ++ arch/arm/common/dmabounce.c | 16 ++++-- arch/arm/xen/mm.c | 1 arch/avr32/mm/dma-coherent.c | 7 ++- arch/blackfin/kernel/dma-mapping.c | 8 +++ arch/c6x/kernel/dma.c | 14 ++++- arch/frv/mb93090-mb00/pci-dma-nommu.c | 14 ++++- arch/frv/mb93090-mb00/pci-dma.c | 9 +++ arch/hexagon/kernel/dma.c | 6 ++ arch/m68k/kernel/dma.c | 8 +++ arch/metag/kernel/dma.c | 16 +++++- arch/microblaze/kernel/dma.c | 10 +++- arch/mips/loongson64/common/dma-swiotlb.c | 2 - arch/mips/mm/dma-default.c | 8 ++- arch/nios2/mm/dma-mapping.c | 26 +++++++--- arch/openrisc/kernel/dma.c | 3 + arch/parisc/kernel/pci-dma.c | 20 ++++++-- arch/powerpc/kernel/dma.c | 9 +++ arch/sh/kernel/dma-nommu.c | 7 ++- arch/sparc/kernel/iommu.c | 4 +- arch/sparc/kernel/ioport.c | 4 +- arch/tile/kernel/pci-dma.c | 12 ++++- arch/x86/xen/pci-swiotlb-xen.c | 1 arch/xtensa/kernel/pci-dma.c | 7 ++- drivers/net/ethernet/intel/igb/igb.h | 7 ++- drivers/net/ethernet/intel/igb/igb_main.c | 77 +++++++++++++++++++---------- drivers/xen/swiotlb-xen.c | 27 +++++----- include/linux/dma-mapping.h | 20 +++++--- include/linux/gfp.h | 2 + include/linux/swiotlb.h | 14 ++--- include/xen/swiotlb-xen.h | 3 - lib/swiotlb.c | 64 +++++++++++------------- mm/page_alloc.c | 14 +++++ 33 files changed, 291 insertions(+), 154 deletions(-) --