[Xen-bugs] [Bug 1227] Out of SW-IOMMU space, 3ware Raid controller/3w-xxxx module

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1227





------- Comment #11 from fthain@xxxxxxxxxxxxxxxxxxx  2011-10-13 05:28 -------
Seems I quoted the wrong documention above... the xen-stable tree has this
commit:

commit f4d4fde49bb47b4db49c211c7c74471eedb86425
Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date:   Fri Jan 29 10:59:10 2010 -0500

    [swiotlb] Make 'setup_io_tlb_npages' accept new 'swiotlb=' syntax.

    The old syntax for 'swiotlb' is still in effect, and we extend it
    now to include the overflow buffer size. The syntax is now:

    swiotlb=[force,][nslabs=<pages>,][overflow=<size>] or more
    commonly know as:

    swiotlb=[force]
    swiotlb=[nslabs=<pages>]
    swiotlb=[overflow=<size>]


But the code doesn't match the doco:

  iommu options only relevant to the software bounce buffering (SWIOTLB) IOMMU
  implementation:
    swiotlb=[npages=<pages>]
    swiotlb=[force]
    swiotlb=[overflow=<size>]

...versus

               /* The new syntax: swiotlb=nslabs=16384,overflow=32768,force */
               val = get_value("nslabs", str, &str);


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