[SRU][Artful][PULL v2] rfi-flush: Switch to new linear fallback flush

[Juerg Haefliger]

v2: Updated patchset from IBM.

BugLink: https://bugs.launchpad.net/bugs/1744173

[Impact]
Change flush method from "congruence-first with dependencies" to "linear with no dependencies", which increases flush performance by 8x on P8, and
3x on P9. Measured with null syscall loop, which will have the flush area in the L2 cache.

The flush also becomes simpler and more adaptable to different cache
geometries.

[Test Case]
TBD.

[Regression Potential]
The risk is deemed low since the changes are confined to POWER only and the provided test kernels have been tested by IBM.

Signed-off-by: Juerg Haefliger <juergh at canonical.com>
---
The following changes since commit 32f2fe36d1166cbd4ec673e4eb65321b14a564f7:

  UBUNTU: SAUCE: Set generic SSBD feature for Intel cpus (2018-05-28 16:11:59 +0200)

are available in the Git repository at:

  git://git.launchpad.net/~juergh/+git/artful-linux lp1744173-wave2

for you to fetch changes up to 59b29ce04397578d5e38547e4e42d21448f58136:

  powerpc/rfi-flush: Call setup_rfi_flush() after LPM migration (2018-05-29 14:01:55 +0200)

----------------------------------------------------------------
Gustavo Walbon (1):
      UBUNTU: SAUCE: rfi-flush: Factor out init_fallback_flush()

Mauricio Faria de Oliveira (1):
      powerpc/rfi-flush: Differentiate enabled and patched flush types

Michael Ellerman (3):
      UBUNTU: SAUCE: rfi-flush: Move rfi_flush_fallback_area to end of paca
      powerpc/rfi-flush: Make it possible to call setup_rfi_flush() again
      powerpc/rfi-flush: Call setup_rfi_flush() after LPM migration

Nicholas Piggin (1):
      powerpc/64s: Improve RFI L1-D cache flush fallback

 arch/powerpc/include/asm/paca.h           |  6 +--
 arch/powerpc/include/asm/setup.h          |  2 +-
 arch/powerpc/kernel/asm-offsets.c         |  3 +-
 arch/powerpc/kernel/exceptions-64s.S      | 76 +++++++++++++++----------------
 arch/powerpc/kernel/setup_64.c            | 59 ++++++++++++------------
 arch/powerpc/platforms/pseries/mobility.c |  3 ++
 arch/powerpc/platforms/pseries/pseries.h  |  2 +
 arch/powerpc/platforms/pseries/setup.c    |  2 +-
 8 files changed, 74 insertions(+), 79 deletions(-)