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

[Stefan Bader]

On 08.05.2018 12:17, Juerg Haefliger wrote:
> BugLink: https://bugs.launchpad.net/bugs/1744173
> 
> [Impact]
> Change flush from congruence-first with dependencies to linear with
> no dependencies, which increases flush performance by 8x on P8, and
> 3x on P9 (as measured with null syscall loop, which will have the
> flush area in the L2).

Does the explanation also exist in English (simplified)?

> 
> 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 4b552a65f2cd5f8a4660072330c0cba67a30f647:
> 
>   UBUNTU: Ubuntu-4.13.0-40.45 (2018-04-25 02:44:49 +0000)
> 
> are available in the Git repository at:
> 
>   git://git.launchpad.net/~juergh/+git/artful-linux lp1744173
> 
> for you to fetch changes up to c6dcffc36846e5b766689689892e3c5f666bc77f:
> 
>   UBUNTU: SAUCE: rfi-flush: Switch to new linear fallback flush (2018-05-08 12:12:05 +0200)
> 
> ----------------------------------------------------------------
> Michael Ellerman (7):
>       UBUNTU: SAUCE: rfi-flush: Factor out init_fallback_flush()
>       UBUNTU: SAUCE: rfi-flush: Make setup_rfi_flush() not __init
>       UBUNTU: SAUCE: rfi-flush: Move the logic to avoid a redo into the sysfs code
>       UBUNTU: SAUCE: rfi-flush: Make it possible to call setup_rfi_flush() again
>       UBUNTU: SAUCE: rfi-flush: Call setup_rfi_flush() after LPM migration
>       UBUNTU: SAUCE: rfi-flush: Move rfi_flush_fallback_area to end of paca
>       UBUNTU: SAUCE: rfi-flush: Mark DEBUG_RFI as BROKEN
> 
> Nicholas Piggin (1):
>       UBUNTU: SAUCE: rfi-flush: Switch to new linear fallback flush
> 
>  arch/powerpc/Kconfig.debug                |  2 +-
>  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            | 73 +++++++++++++++--------------
>  arch/powerpc/kernel/sysfs.c               |  9 +++-
>  arch/powerpc/platforms/pseries/mobility.c |  3 ++
>  arch/powerpc/platforms/pseries/pseries.h  |  2 +
>  arch/powerpc/platforms/pseries/setup.c    |  4 +-
>  10 files changed, 95 insertions(+), 85 deletions(-)
> 


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