linux.git/arch/powerpc/kernel/smp.c, branch v6.13

powerpc: Split systemcfg struct definitions out from vdso

2024-11-02T11:37:36+00:00

The systemcfg data has nothing to do anymore with the vdso.
Split it into a dedicated header file.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-27-b64f0842d512@linutronix.de

powerpc: Split systemcfg data out of vdso data page

2024-11-02T11:37:36+00:00

The systemcfg data only has minimal overlap with the vdso data.
Splitting the two avoids mapping the implementation-defined vdso data
into /proc/ppc64/systemcfg.
It is also a preparation for the standardization of vdso data storage.

The only field actually used by both systemcfg and vdso is
tb_ticks_per_sec and it is only changed once during time_init().
Initialize it in both structures there.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-26-b64f0842d512@linutronix.de

smp: Mark smp_prepare_boot_cpu() __init

2024-09-08T14:01:10+00:00

smp_prepare_boot_cpu() is only called during boot, hence mark it as
__init.

Signed-off-by: Bibo Mao 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Huacai Chen 
Link: https://lore.kernel.org/all/20240907082720.452148-1-maobibo@loongson.cn

powerpc: Fix typos

2024-05-07T14:21:30+00:00

Fix typos, most reported by "codespell arch/powerpc".  Only touches
comments, no code changes.

Signed-off-by: Bjorn Helgaas 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240103231605.1801364-8-helgaas@kernel.org

powerpc/kdump: Split KEXEC_CORE and CRASH_DUMP dependency

2024-03-17T02:34:00+00:00

Remove CONFIG_CRASH_DUMP dependency on CONFIG_KEXEC. CONFIG_KEXEC_CORE
was used at places where CONFIG_CRASH_DUMP or CONFIG_CRASH_RESERVE was
appropriate. Replace with appropriate #ifdefs to support CONFIG_KEXEC
and !CONFIG_CRASH_DUMP configuration option. Also, make CONFIG_FA_DUMP
dependent on CONFIG_CRASH_DUMP to avoid unmet dependencies for FA_DUMP
with !CONFIG_KEXEC_CORE configuration option.

Signed-off-by: Hari Bathini 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240226103010.589537-4-hbathini@linux.ibm.com

sched/topology: Rename SD_SHARE_PKG_RESOURCES to SD_SHARE_LLC

2024-02-28T14:43:17+00:00

SD_SHARE_PKG_RESOURCES is a bit of a misnomer: its naming suggests that
it's sharing all 'package resources' - while in reality it's specifically
for sharing the LLC only.

Rename it to SD_SHARE_LLC to reduce confusion.

[ mingo: Rewrote the confusing changelog as well. ]

Suggested-by: Valentin Schneider 
Signed-off-by: Alex Shi 
Signed-off-by: Ingo Molnar 
Reviewed-by: Valentin Schneider 
Reviewed-by: Ricardo Neri 
Reviewed-by: Barry Song 
Link: https://lore.kernel.org/r/20240210113924.1130448-5-alexs@kernel.org

powerpc/smp: Dynamically build Powerpc topology

2023-12-15T02:51:34+00:00

Currently there are four Powerpc specific sched topologies.  These are
all statically defined.  However not all these topologies are used by
all Powerpc systems.

To avoid unnecessary degenerations by the scheduler, masks and flags
are compared. However if the sched topologies are build dynamically then
the code is simpler and there are greater chances of avoiding
degenerations.

Note:
Even X86 builds its sched topologies dynamically and proposed changes
are very similar to the way X86 is building its topologies.

Signed-off-by: Srikar Dronamraju 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20231214180720.310852-6-srikar@linux.vnet.ibm.com

powerpc/smp: Avoid asym packing within thread_group of a core

2023-12-15T02:51:34+00:00

PowerVM Hypervisor will schedule at a core granularity. However each
core can have more than one thread_groups. For better utilization in
case of a shared processor, its preferable for the scheduler to pack to
the lowest core. However there is no benefit of moving a thread between
two thread groups of the same core.

Signed-off-by: Srikar Dronamraju 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20231214180720.310852-5-srikar@linux.vnet.ibm.com

powerpc/smp: Add __ro_after_init attribute

2023-12-15T02:51:34+00:00

There are some variables that are only updated at boot time.
So add __ro_after_init attribute to such variables

Signed-off-by: Srikar Dronamraju 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20231214180720.310852-4-srikar@linux.vnet.ibm.com

powerpc/smp: Disable MC domain for shared processor

2023-12-15T02:51:34+00:00

Like L2-cache info, coregroup information which is used to determine MC
sched domains is only present on dedicated LPARs. i.e PowerVM doesn't
export coregroup information for shared processor LPARs. Hence disable
creating MC domains on shared LPAR Systems.

Signed-off-by: Srikar Dronamraju 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20231214180720.310852-3-srikar@linux.vnet.ibm.com