Hello,
This patchset is based on Viresh's Rust cpufreq patchset [1] and
implements a basic cppc cpufreq driver in Rust. The following features/
possibilities are not supported yet:
- vendor specific workarounds
- Frequency Invariance Engine (FIE)
- artificial Energy Model (EM)
- (struct cpufreq_driver).attr field
- QoS requests
Testing:
The patchset was tested on a CPPC based Juno-r2 platform. It was
checked that the underlying firmware received the freq. requests
the OS made.
The platform doesn't support Delivered/Reference Performance Counters
which are used to infer the current frequency of a perf. domain. The
.get() function of the driver was thus implemented, but bypassed
during testing.
[1]
Can be found at:
- git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git rust/cpufreq-dt
- latest commit: 2b6d636d1c7db3b21198105ad3ed5f458f027637
("defconfig: Update Rust and initramfs")
- Latest version is available at:
- https://lore.kernel.org/lkml/cover.1722334569.git.viresh.kumar@xxxxxxxxxx/
Pierre Gondois (6):
ACPI: CPPC: Move struct cppc_cpudata to cppc_cpufreq driver
cpufreq: cppc: Remove perf_fb_ctrs field from struct cppc_cpudata
rust: module: Allow modules to specify initcall section
rust: cpufreq: Add methods to struct Cpufreq
rust: bindings: Add bindings for rcppc_cpufreq driver
rust: cpufreq: Add rust implementation of cppc_cpufreq driver
drivers/acpi/cppc_acpi.c | 26 ++-
drivers/cpufreq/Kconfig | 16 ++
drivers/cpufreq/Makefile | 1 +
drivers/cpufreq/cppc_cpufreq.c | 12 +-
drivers/cpufreq/rcppc_cpufreq.rs | 333 +++++++++++++++++++++++++++++++
include/acpi/cppc_acpi.h | 13 +-
rust/bindings/bindings_helper.h | 1 +
rust/helpers.c | 6 +
rust/kernel/cpufreq.rs | 53 +++++
rust/macros/module.rs | 21 +-
10 files changed, 457 insertions(+), 25 deletions(-)
create mode 100644 drivers/cpufreq/rcppc_cpufreq.rs
--
2.25.1
