[PATCH v6 0/8] powerpc/pseries: Machine check handler improvements.

[Mahesh J Salgaonkar]

This patch series includes some improvement to Machine check handler
for pSeries. Patch 1 fixes a buffer overrun issue if rtas extended error
log size is greater than RTAS_ERROR_LOG_MAX.
Patch 2 fixes an issue where machine check handler crashes
kernel while accessing vmalloc-ed buffer while in nmi context.
Patch 3 fixes endain bug while restoring of r3 in MCE handler.
Patch 5 implements a real mode mce handler and flushes the SLBs on SLB error.
Patch 6 display's the MCE error details on console.
Patch 7 saves and dumps the SLB contents on SLB MCE errors to improve the
debugability.
Patch 8 consolidates mce early real mode handling code.

Change in V6:
- Introduce patch 8 to consolidate early real mode handling code.
- Address Nick's comment on erroneous hunk.

Change in V5:
- Use min_t instead of max_t.
- Fix an issue reported by kbuild test robot and address review comments.

Change in V4:
- Flush the SLBs in real mode mce handler to handle SLB errors for entry 0.
- Allocate buffers per cpu to hold rtas error log and old slb contents.
- Defer the logging of rtas error log to irq work queue.

Change in V3:
- Moved patch 5 to patch 2

Change in V2:
- patch 3: Display additional info (NIP and task info) in MCE error details.
- patch 5: Fix endain bug while restoring of r3 in MCE handler.


---

Mahesh Salgaonkar (8):
      powerpc/pseries: Avoid using the size greater than RTAS_ERROR_LOG_MAX.
      powerpc/pseries: Defer the logging of rtas error to irq work queue.
      powerpc/pseries: Fix endainness while restoring of r3 in MCE handler.
      powerpc/pseries: Define MCE error event section.
      powerpc/pseries: flush SLB contents on SLB MCE errors.
      powerpc/pseries: Display machine check error details.
      powerpc/pseries: Dump the SLB contents on SLB MCE errors.
      powernv/pseries: consolidate code for mce early handling.


 arch/powerpc/include/asm/book3s/64/mmu-hash.h |    8 +
 arch/powerpc/include/asm/machdep.h            |    1 
 arch/powerpc/include/asm/paca.h               |    4 
 arch/powerpc/include/asm/rtas.h               |  116 ++++++++++++
 arch/powerpc/kernel/exceptions-64s.S          |   18 +-
 arch/powerpc/kernel/mce.c                     |   16 +-
 arch/powerpc/mm/slb.c                         |   63 +++++++
 arch/powerpc/platforms/pseries/pseries.h      |    1 
 arch/powerpc/platforms/pseries/ras.c          |  242 +++++++++++++++++++++++--
 arch/powerpc/platforms/pseries/setup.c        |   27 +++
 10 files changed, 471 insertions(+), 25 deletions(-)

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