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

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

Juerg Haefliger
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).

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 <[hidden email]>
---
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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ACK: [SRU][Artful][PULL] rfi-flush: Switch to new linear fallback flush

Kleber Souza
On 05/08/18 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).
>
> 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 <[hidden email]>
> ---
> 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)

Limited to specific arch, tested by the vendor.

Acked-by: Kleber Sacilotto de Souza <[hidden email]>

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

Stefan Bader-2
In reply to this post by Juerg Haefliger
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 <[hidden email]>
> ---
> 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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Re: [SRU][Artful][PULL] rfi-flush: Switch to new linear fallback flush

Juerg Haefliger
On 05/23/2018 03:38 PM, Stefan Bader wrote:

> 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)?
This is IBM's wording. I massaged it a little to make it clearer, hopefully:

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.

...Juerg

>>
>> 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 <[hidden email]>
>> ---
>> 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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[SRU][Artful][PULL v2] rfi-flush: Switch to new linear fallback flush

Juerg Haefliger
In reply to this post by 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 <[hidden email]>
---
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(-)

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

Kleber Souza
On 05/29/18 05:30, Juerg Haefliger wrote:

> 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 <[hidden email]>
> ---
> 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(-)
>

Changes look good, tested by the vendor.

Acked-by: Kleber Sacilotto de Souza <[hidden email]>

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

Stefan Bader-2
In reply to this post by Juerg Haefliger
On 29.05.2018 05:30, Juerg Haefliger wrote:

> 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 <[hidden email]>
> ---
> 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(-)
>
Acked-by: Stefan Bader <[hidden email]>



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

Khalid Elmously
In reply to this post by Juerg Haefliger
applied to artful


On 2018-05-29 14:30:18 , Juerg Haefliger wrote:

> 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 <[hidden email]>
> ---
> 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(-)
>
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