1. 30 Nov, 2008 1 commit
    • Arnd Bergmann's avatar
      powerpc/cell/axon-msi: Retry on missing interrupt · d015fe99
      Arnd Bergmann authored
      
      
      The MSI capture logic for the axon bridge can sometimes
      lose interrupts in case of high DMA and interrupt load,
      when it signals an MSI interrupt to the MPIC interrupt
      controller while we are already handling another MSI.
      
      Each MSI vector gets written into a FIFO buffer in main
      memory using DMA, and that DMA access is normally flushed
      by the actual interrupt packet on the IOIF.  An MMIO
      register in the MSIC holds the position of the last
      entry in the FIFO buffer that was written.  However,
      reading that position does not flush the DMA, so that
      we can observe stale data in the buffer.
      
      In a stress test, we have observed the DMA to arrive
      up to 14 microseconds after reading the register.
      
      This patch works around this problem by retrying the
      access to the FIFO buffer.
      
      We can reliably detect the conditioning by writing
      an invalid MSI vector into the FIFO buffer after
      reading from it, assuming that all MSIs we get
      are valid.  After detecting an invalid MSI vector,
      we udelay(1) in the interrupt cascade for up to
      100 times before giving up.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      d015fe99
  2. 20 Nov, 2008 1 commit
    • Jeremy Kerr's avatar
      powerpc/spufs: Fix spinning in spufs_ps_fault on signal · 60657263
      Jeremy Kerr authored
      
      
      Currently, we can end up in an infinite loop if we get a signal
      while the kernel has faulted in spufs_ps_fault. Eg:
      
       alarm(1);
      
       write(fd, some_spu_psmap_register_address, 4);
      
      - the write's copy_from_user will fault on the ps mapping, and
      signal_pending will be non-zero. Because returning from the fault
      handler will never clear TIF_SIGPENDING, so we'll just keep faulting,
      resulting in an unkillable process using 100% of CPU.
      
      This change returns VM_FAULT_SIGBUS if there's a fatal signal pending,
      letting us escape the loop.
      Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
      60657263
  3. 05 Nov, 2008 2 commits
  4. 31 Oct, 2008 4 commits
    • Kumar Gala's avatar
      powerpc/mpic: Fix regression caused by change of default IRQ affinity · 3c10c9c4
      Kumar Gala authored
      The Freescale implementation of MPIC only allows a single CPU destination
      for non-IPI interrupts.  We add a flag to the mpic_init to distinquish
      these variants of MPIC.  We pull in the irq_choose_cpu from sparc64 to
      select a single CPU as the destination of the interrupt.
      
      This is to deal with the fact that the default smp affinity was
      changed by commit 18404756
      
       ("genirq:
      Expose default irq affinity mask (take 3)") to be all CPUs.
      Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      3c10c9c4
    • Mark Nelson's avatar
      powerpc: Update remaining dma_mapping_ops to use map/unmap_page · f9226d57
      Mark Nelson authored
      
      
      After the merge of the 32 and 64bit DMA code, dma_direct_ops lost
      their map/unmap_single() functions but gained map/unmap_page().  This
      caused a problem for Cell because Cell's dma_iommu_fixed_ops called
      the dma_direct_ops if the fixed linear mapping was to be used or the
      iommu ops if the dynamic window was to be used.  So in order to fix
      this problem we need to update the 64bit DMA code to use
      map/unmap_page.
      
      First, we update the generic IOMMU code so that iommu_map_single()
      becomes iommu_map_page() and iommu_unmap_single() becomes
      iommu_unmap_page().  Then we propagate these changes up through all
      the callers of these two functions and in the process update all the
      dma_mapping_ops so that they have map/unmap_page rahter than
      map/unmap_single.  We can do this because on 64bit there is no HIGHMEM
      memory so map/unmap_page ends up performing exactly the same function
      as map/unmap_single, just taking different arguments.
      
      This has no affect on drivers because the dma_map_single_attrs() just
      ends up calling the map_page() function of the appropriate
      dma_mapping_ops and similarly the dma_unmap_single_attrs() calls
      unmap_page().
      
      This fixes an oops on Cell blades, which oops on boot without this
      because they call dma_direct_ops.map_single, which is NULL.
      Signed-off-by: default avatarMark Nelson <markn@au1.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      f9226d57
    • Nathan Fontenot's avatar
      powerpc/pci: Properly allocate bus resources for hotplug PHBs · e90a1318
      Nathan Fontenot authored
      
      
      Resources for PHB's that are dynamically added to a system are not
      properly allocated in the resource tree.
      
      Not having these resources allocated causes an oops when removing
      the PHB when we try to release them.
      
      The diff appears a bit messy, this is mainly due to moving everything
      one tab to the left in the pcibios_allocate_bus_resources routine.
      The functionality change in this routine is only that the
      list_for_each_entry() loop is pulled out and moved to the necessary
      calling routine.
      Signed-off-by: default avatarNathan Fontenot <nfont@austin.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      e90a1318
    • Milton Miller's avatar
      powerpc: Use is_kdump_kernel() · 62a8bd6c
      Milton Miller authored
      
      
      linux/crash_dump.h defines is_kdump_kernel() to be used by code that
      needs to know if the previous kernel crashed instead of a (clean) boot
      or reboot.
      
      This updates the just added powerpc code to use it.  This is needed
      for the next commit, which will remove __kdump_flag.
      Signed-off-by: default avatarMilton Miller <miltonm@bga.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      62a8bd6c
  5. 28 Oct, 2008 2 commits
  6. 23 Oct, 2008 1 commit
  7. 22 Oct, 2008 2 commits
  8. 21 Oct, 2008 10 commits
  9. 20 Oct, 2008 1 commit
  10. 17 Oct, 2008 3 commits
  11. 15 Oct, 2008 1 commit
  12. 14 Oct, 2008 3 commits
  13. 13 Oct, 2008 9 commits