Messages in this thread |  | | From | Viresh Kumar <> | Subject | [RFC 0/3] cpufreq: cppc: Add support for frequency invariance | Date | Thu, 9 Jul 2020 15:43:32 +0530 |
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Hello,
CPPC cpufreq driver is used for ARM servers and this patch series tries to provide frequency invariance support for them. The same is also provided using a specific hardware extension, known as AMU (Activity Monitors Unit), but that is optional for platforms and at least few of them don't have it.
This patchset allows multiple parts of the kernel to provide the same functionality, by registering with the topology core.
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.
Ionela/Peter Puhov, it would be nice if you guys can give this a shot.
This is based of my cpufreq/arm/linux-next branch (should work on linux-next too) + a cleanup patch [1] that i sent this morning.
-- viresh
[1] https://lore.kernel.org/lkml/a710fc4e4e0f1d2e561320130b99bcb5167d73b4.1594277563.git.viresh.kumar@linaro.org/
Viresh Kumar (3): arm64: topology: Add amu_counters_supported() helper topology: Provide generic implementation of arch_freq_counters_available() cpufreq: cppc: Add support for frequency invariance
arch/arm64/include/asm/topology.h | 7 -- arch/arm64/kernel/topology.c | 165 +++++++++++++++--------------- drivers/base/arch_topology.c | 43 +++++++- drivers/cpufreq/cppc_cpufreq.c | 138 ++++++++++++++++++++++++- include/linux/arch_topology.h | 5 +- kernel/sched/core.c | 1 + 6 files changed, 263 insertions(+), 96 deletions(-)
-- 2.25.0.rc1.19.g042ed3e048af
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