[RFC PATCH v2 0/3] Asynchronous EEH recovery

[Ganesh Goudar <ganeshgr@linux.ibm.com>]

Hi,

EEH recovery is currently serialized and these patches shorten
the time taken for EEH recovery by making the recovery to run
in parallel. The original author of these patches is Sam Bobroff,
I have rebased and tested these patches.

On powervm with 64 VFs from same PHB,  I see approximately 48%
reduction in time taken in EEH recovery.

On powernv with 9 network cards, Where 2 cards installed on one
PHB and 1 card on each of the rest of the PHBs, Providing 20 PFs
in total. I see approximately 33% reduction in time taken in EEH
recovery.

These patches were originally posted as separate RFCs by Sam, And
I rebased and posted these patches almost a year back, I stopped
pursuing these patches as I was not able test this on powernv, Due
to the issues in drivers of cards I was testing this on, Which are
now resolved. Since I am re-posting this after long time, Posting
this as a fresh RFC, Please comment.

Thanks.

V2:
 * Since we now have event list per phb, Have per phb event list lock.
 * Appropriate names given to the locks.
 * Remove stale comments (few more to be removed).
 * Initialize event_id to 0 instead of 1.
 * And some cosmetic changes.

Ganesh Goudar (3):
  powerpc/eeh: Synchronization for safety
  powerpc/eeh: Provide a unique ID for each EEH recovery
  powerpc/eeh: Asynchronous recovery

 arch/powerpc/include/asm/eeh.h               |  13 +-
 arch/powerpc/include/asm/eeh_event.h         |  10 +-
 arch/powerpc/include/asm/pci-bridge.h        |   4 +
 arch/powerpc/include/asm/ppc-pci.h           |   2 +-
 arch/powerpc/kernel/eeh.c                    | 159 +++--
 arch/powerpc/kernel/eeh_driver.c             | 580 +++++++++++++++----
 arch/powerpc/kernel/eeh_event.c              |  75 ++-
 arch/powerpc/kernel/eeh_pe.c                 |  34 +-
 arch/powerpc/platforms/powernv/eeh-powernv.c |  12 +-
 arch/powerpc/platforms/pseries/eeh_pseries.c |   5 +-
 arch/powerpc/platforms/pseries/pci_dlpar.c   |   5 +-
 drivers/pci/hotplug/pnv_php.c                |   5 +-
 drivers/pci/hotplug/rpadlpar_core.c          |   2 +
 drivers/vfio/vfio_iommu_spapr_tce.c          |  10 +-
 include/linux/mmzone.h                       |   2 +-
 15 files changed, 693 insertions(+), 225 deletions(-)

-- 
2.40.1