[RFC][GIT PULL] dma-api debugging facility

[Joerg Roedel]

Hi Ingo,

The following changes since commit 0bd5c4f7c874cf48ff7904dcf8a59988c8fea0e8:
  Ingo Molnar (1):
        Merge branch 'iommu/fixes-2.6.29' of git://git.kernel.org/.../joro/linux-2.6-iommu into core/iommu

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu.git dma-api/debug

David Woodhouse (2):
      dma-debug: add function to dump dma mappings
      dma-debug: print stacktrace of mapping path on unmap error

Joerg Roedel (16):
      dma-debug: add Kconfig entry
      dma-debug: add header file and core data structures
      dma-debug: add hash functions for dma_debug_entries
      dma-debug: add allocator code
      dma-debug: add initialization code
      dma-debug: add kernel command line parameters
      dma-debug: add debugfs interface
      dma-debug: add core checking functions
      dma-debug: add checking for map/unmap_page/single
      dma-debug: add add checking for map/unmap_sg
      dma-debug: add checking for [alloc|free]_coherent
      dma-debug: add checks for sync_single_*
      dma-debug: add checks for sync_single_range_*
      dma-debug: add checks for sync_single_sg_*
      dma-debug: x86 architecture bindings
      dma-debug: Documentation update

 Documentation/DMA-API.txt           |  106 +++++
 Documentation/kernel-parameters.txt |   10 +
 arch/Kconfig                        |    2 +
 arch/x86/Kconfig                    |    1 +
 arch/x86/include/asm/dma-mapping.h  |   45 ++-
 arch/x86/kernel/pci-dma.c           |    6 +
 include/linux/dma-debug.h           |  167 +++++++
 lib/Kconfig.debug                   |   11 +
 lib/Makefile                        |    2 +
 lib/dma-debug.c                     |  870 +++++++++++++++++++++++++++++++++++
 10 files changed, 1214 insertions(+), 6 deletions(-)
 create mode 100644 include/linux/dma-debug.h
 create mode 100644 lib/dma-debug.c

A few changes were made since the v3 post of this code:

* new checks were added
* stack trace of mapping path is printed
* default number of preallocated entries has been increased to 32768 on
  x86 - in the latest tests I had more than 26000 dma-api allocations in
  the hash
* therefore the hash size has been increased to 1024

Please pull.

Joerg

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