linux-kernel - [PATCH v2 0/4] Fixes for dma-iommu swiotlb bounce buffers

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Date:   Fri,  9 Jul 2021 12:34:58 +0900
From:   David Stevens <stevensd@...omium.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Tom Murphy <murphyt7@....ie>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, David Stevens <stevensd@...omium.org>
Subject: [PATCH v2 0/4] Fixes for dma-iommu swiotlb bounce buffers

From: David Stevens <stevensd@...omium.org>

This patch set includes two fixes for bugs caused by mixing up the
original buffer's physical address and bounce buffer's physical address.
It also includes a performance fix that avoids an extra copy, as well as
a general cleanup fix.

The issues were found via code inspection, so I don't have any specific
use cases where things were not working, or any performance numbers.

v1 -> v2:
 - Split fixes into dedicated patches
 - Less invasive changes to fix arch_sync when mapping
 - Leave dev_is_untrusted check for strict iommu

David Stevens (4):
  dma-iommu: fix sync_sg with swiotlb
  dma-iommu: fix arch_sync_dma for map with swiotlb
  dma-iommu: pass SKIP_CPU_SYNC to swiotlb unmap
  dma-iommu: Check CONFIG_SWIOTLB more broadly

 drivers/iommu/dma-iommu.c | 63 ++++++++++++++++++++-------------------
 1 file changed, 33 insertions(+), 30 deletions(-)

-- 
2.32.0.93.g670b81a890-goog