1. 28 Mar, 2012 1 commit
  2. 15 Dec, 2011 1 commit
    • Konrad Rzeszutek Wilk's avatar
      xen/swiotlb: Use page alignment for early buffer allocation. · 63a74175
      Konrad Rzeszutek Wilk authored
      This fixes an odd bug found on a Dell PowerEdge 1850/0RC130
      (BIOS A05 01/09/2006) where all of the modules doing pci_set_dma_mask
      would fail with:
      
      ata_piix 0000:00:1f.1: enabling device (0005 -> 0007)
      ata_piix 0000:00:1f.1: can't derive routing for PCI INT A
      ata_piix 0000:00:1f.1: BMDMA: failed to set dma mask, falling back to PIO
      
      The issue was the Xen-SWIOTLB was allocated such as that the end of
      buffer was stradling a page (and also above 4GB). The fix was
      spotted by Kalev Leonid  which was to piggyback on git commit
      e79f86b2 "swiotlb: Use page alignment
      for early buffer allocation" which:
      
      	We could call free_bootmem_late() if swiotlb is not used, and
      	it will shrink to page alignment.
      
      	So alloc them with page alignment at first, to avoid lose two pages
      
      And doing that fixes the outstanding issue.
      
      CC: stable@kernel.org
      Suggested-by: default avatar"Kalev, Leonid" <Leonid.Kalev@ca.com>
      Reported-and-Tested-by: default avatar"Taylor, Neal E" <Neal.Taylor@ca.com>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      63a74175
  3. 06 Dec, 2011 1 commit
  4. 31 Oct, 2011 1 commit
  5. 26 Aug, 2011 4 commits
  6. 06 Jun, 2011 1 commit
    • FUJITA Tomonori's avatar
      swiotlb: Export swioltb_nr_tbl and utilize it as appropiate. · 5f98ecdb
      FUJITA Tomonori authored
      By default the io_tlb_nslabs is set to zero, and gets set to
      whatever value is passed in via swiotlb_init_with_tbl function.
      The default value passed in is 64MB. However, if the user provides
      the 'swiotlb=<nslabs>' the default value is ignored and
      the value provided by the user is used... Except when the SWIOTLB
      is used under Xen - there the default value of 64MB is used and
      the Xen-SWIOTLB has no mechanism to get the 'io_tlb_nslabs' filled
      out by setup_io_tlb_npages functions. This patch provides a function
      for the Xen-SWIOTLB to call to see if the io_tlb_nslabs is set
      and if so use that value.
      Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      5f98ecdb
  7. 10 Apr, 2011 1 commit
  8. 27 Jul, 2010 1 commit
    • Konrad Rzeszutek Wilk's avatar
      swiotlb-xen: SWIOTLB library for Xen PV guest with PCI passthrough. · b097186f
      Konrad Rzeszutek Wilk authored
      This patchset:
      
      PV guests under Xen are running in an non-contiguous memory architecture.
      
      When PCI pass-through is utilized, this necessitates an IOMMU for
      translating bus (DMA) to virtual and vice-versa and also providing a
      mechanism to have contiguous pages for device drivers operations (say DMA
      operations).
      
      Specifically, under Xen the Linux idea of pages is an illusion. It
      assumes that pages start at zero and go up to the available memory. To
      help with that, the Linux Xen MMU provides a lookup mechanism to
      translate the page frame numbers (PFN) to machine frame numbers (MFN)
      and vice-versa. The MFN are the "real" frame numbers. Furthermore
      memory is not contiguous. Xen hypervisor stitches memory for guests
      from different pools, which means there is no guarantee that PFN==MFN
      and PFN+1==MFN+1. Lastly with Xen 4.0, pages (in debug mode) are
      allocated in descending order (high to low), meaning the guest might
      never get any MFN's under the 4GB mark.
      Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Acked-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
      Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: Albert Herranz <albert_herranz@yahoo.es>
      Cc: Ian Campbell <Ian.Campbell@citrix.com>
      b097186f