[PATCH v1 00/10] powerpc/eeh: Remove eeh_mutex

[Gavin Shan]

The series of patches are follow-up in order to make EEH workable for PowerNV
platform on Juno-IOC-L machine. Couple of issues have been fixed with help of
Ben:
	- eeh_lock() and eeh_unlock() were introduced to protect the PE hierarchy
	  tree. However, we already had one kthread ("eehd"). So that's not necessary
	  any more.
	- When PHB gets fenced, we need do complete reset for the PHB in order
	  for recovery. However, we never checked the downstream PCIe links are
	  ready again.
	- Introduce mechanism to block accessing to PCI-CFG and MMIO. The hardware
	  should return 0xFF's while the PHB is fenced. So we needn't access PCI-CFG
	  and MMIO during the stage (before the PHB gets complete reset).
	- EEH address cache wasn't populated on PowerNV.
	- PCI-CFG for PCI bridges (PCI_COMMAND) wasn't restored correctly.
	- While PHB gets fenced, TG3 driver is still trying to access MMIO with loop.
	  That's unnecessary.

The series of patches have been verified on Juno-IOC-L machine:

Trigger frozen PE:

        echo 0x0000000002000000 > /sys/kernel/debug/powerpc/PCI0000/err_injct
        sleep 1
        echo 0x0 > /sys/kernel/debug/powerpc/PCI0000/err_injct

Trigger fenced PHB:

	echo 0x8000000000000000 > /sys/kernel/debug/powerpc/PCI0000/err_injct

---

arch/powerpc/include/asm/eeh.h               |  251 ++++++++++++++++++++------
arch/powerpc/include/asm/io.h                |   67 ++++---
arch/powerpc/kernel/eeh.c                    |   85 ++++++---
arch/powerpc/kernel/eeh_cache.c              |    2 +-
arch/powerpc/kernel/eeh_driver.c             |   11 ++
arch/powerpc/kernel/eeh_event.c              |    3 +-
arch/powerpc/kernel/eeh_pe.c                 |  150 ++++++++++++----
arch/powerpc/platforms/powernv/eeh-ioda.c    |   88 +++++++++-
arch/powerpc/platforms/powernv/eeh-powernv.c |   42 ++++-
arch/powerpc/platforms/powernv/pci-ioda.c    |    1 +
arch/powerpc/platforms/powernv/pci.c         |   63 +++++--
arch/powerpc/platforms/powernv/pci.h         |   16 ++-
arch/powerpc/platforms/pseries/eeh_pseries.c |   44 +++++
drivers/net/ethernet/broadcom/tg3.c          |   36 ++++
14 files changed, 685 insertions(+), 174 deletions(-)

Thanks,
Gavin