linux-kernel - [PATCH v3 0/4] Optimise 64-bit IOVA allocations

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Date:   Tue, 22 Aug 2017 16:17:41 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        thunder.leizhen@...wei.com, ard.biesheuvel@...aro.org,
        nwatters@...eaurora.org, ray.jui@...adcom.com
Subject: [PATCH v3 0/4] Optimise 64-bit IOVA allocations

Hi all,

Just a quick repost of v2[1] with a small fix for the bug reported by Nate.
To recap, whilst this mostly only improves worst-case performance, those
worst-cases have a tendency to be pathologically bad:

Ard reports general desktop performance with Chromium on AMD Seattle going
from ~1-2FPS to perfectly usable.

Leizhen reports gigabit ethernet throughput going from ~6.5Mbit/s to line
speed.

I also inadvertantly found that the HiSilicon hns_dsaf driver was taking ~35s
to probe simply becuase of the number of DMA buffers it maps on startup (perf
shows around 76% of that was spent under the lock in alloc_iova()). With this
series applied it takes a mere ~1s, mostly of unrelated mdelay()s, with
alloc_iova() entirely lost in the noise.

Robin.

[1] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg19139.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             | 114 +++++++++++++++++----------------------
 drivers/misc/mic/scif/scif_rma.c |   3 +-
 include/linux/iova.h             |   8 +--
 8 files changed, 62 insertions(+), 105 deletions(-)

-- 
2.13.4.dirty