| From: |
| Viresh Kumar <viresh.kumar-AT-linaro.org> |
| To: |
| Ionela Voinescu <ionela.voinescu-AT-arm.com>, Rafael Wysocki <rjw-AT-rjwysocki.net>, Catalin Marinas <catalin.marinas-AT-arm.com>, Will Deacon <will-AT-kernel.org> |
| Subject: |
| [PATCH V3 0/2] cpufreq: cppc: Add support for frequency invariance |
| Date: |
| Thu, 28 Jan 2021 16:18:54 +0530 |
| Message-ID: |
| <cover.1611829953.git.viresh.kumar@linaro.org> |
| Cc: |
| Viresh Kumar <viresh.kumar-AT-linaro.org>, Vincent Guittot <vincent.guittot-AT-linaro.org>, linux-kernel-AT-vger.kernel.org, linux-arm-kernel-AT-lists.infradead.org, linux-pm-AT-vger.kernel.org, Sudeep Holla <sudeep.holla-AT-arm.com>, Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org> |
| Archive-link: |
| Article |
Hello,
CPPC cpufreq driver is used for ARM servers and this patch series tries
to provide counter-based frequency invariance support for them in the
absence for architecture specific counters (like AMUs).
This is tested with some hacks, as I didn't have access to the right
hardware, on the ARM64 hikey board to check the overall functionality
and that works fine.
Vincent/Ionela, it would be nice if you guys can give this a shot on
some real hardware where counters work.
This is based of pm/linux-next (need some stuff from the arm64 tree).
These patches should get merged via the arm64 tree only for the same
reason.
Changes since V2:
- Not sending as an RFC anymore.
- Several renames, reordering of code in 1/2 based on Ionela's comments.
- Several rebase changes for 2/2.
- The freq_scale calculations are optimized a bit.
- Better overall commenting and commit logs.
Changes since V1:
- The interface for setting the callbacks is improved, so different
parts looking to provide their callbacks don't need to think about
each other.
- Moved to per-cpu storage for storing the callback related data, AMU
counters have higher priority with this.
--
viresh
Viresh Kumar (2):
topology: Allow multiple entities to provide sched_freq_tick()
callback
cpufreq: cppc: Add support for frequency invariance
arch/arm64/include/asm/topology.h | 10 +-
arch/arm64/kernel/topology.c | 89 +++++++--------
drivers/base/arch_topology.c | 56 +++++++++-
drivers/cpufreq/cppc_cpufreq.c | 179 ++++++++++++++++++++++++++++--
include/linux/arch_topology.h | 15 ++-
kernel/sched/core.c | 1 +
6 files changed, 274 insertions(+), 76 deletions(-)
--
2.25.0.rc1.19.g042ed3e048af
