[Xen-devel] [RFC PATCH v4 0/9] xen_cpufreq implementation in kernel

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

Hi to all.

Next series of patches implements xen-cpufreq driver in kernel.

Cpufreq core and registered cpufreq governors are located in xen. Dom0 has CPU
driver which can only change frequency of the physical CPUs. In addition this
driver can change CPUs regulator voltage. At start time xen-cpufreq driver
in kernel uploads to Xen information about physical cpus.
Xen notifies Dom0 kernel using VIRQ_CPUFREQ interrupt. Then xen-cpufreq driver
in kernel uses XEN_SYSCTL_cpufreq_op operation from HYPERVISOR_sysctl hypercall
to get some parameters from Xen (frequency, relation and cpu number).
Then xen-cpufreq changes frequency on physical cpu and uses the same
XEN_SYSCTL_cpufreq_op operation ti give the result to Xen.

Next configs should be enabled to use xen-cpufreq driver:
CONFIG_GENERIC_CPUFREQ_CPU0
CONFIG_XEN_CPUFREQ

Changed since v1:
 * added cpufreq_drv_ops which allows to use more than one high-level
   cpufreq driver
 * reworked xen-cpufreq and drivers so the same kernel is able to run
   on bare metal and within Xen.

Changed since v2:
 * used VIRQ_CPUFREQ with number 14 instead of the 13
 * slightly reworked xen-cpufreq driver

Changed since v3:
 * documented /hypervisor/pcpus/ node
 * added cpufreq shared info definition to receive commands from the
   Xen cpufreq driver
 * config CONFIG_CPUMASK_OFFSTACK now is checked in the Kconfig

Oleksandr Dmytryshyn (9):
  PM / OPP: make cpufreq functions dependent on CONFIG_CPU_FREQ_TABLE
  xen/arm: implement HYPERVISOR_sysctl
  xen/arm: implement HYPERVISOR_dom0_op
  docs: Xen ARM DT bindings: document pcpus property
  cpufreq: cpufreq-cpu0: change cpus data path in devtree for hwdom
    kernel
  cpufreq: introduce cpufreq_drv_ops
  cpufreq: make cpufreq low-level drivers visible for CPUFREQ_DRV_OPS
    config
  xen: arm: add cpufreq shared info definition
  xen/arm: cpufreq: add xen-cpufreq driver

 Documentation/devicetree/bindings/arm/xen.txt |  20 +-
 arch/arm/include/asm/xen/hypercall.h          |   2 +
 arch/arm/include/asm/xen/interface.h          |  13 +-
 arch/arm/xen/enlighten.c                      |   2 +
 arch/arm/xen/hypercall.S                      |   2 +
 drivers/Makefile                              |   2 +-
 drivers/base/power/opp.c                      |   4 +-
 drivers/cpufreq/Kconfig                       |  40 +-
 drivers/cpufreq/Makefile                      |   2 +
 drivers/cpufreq/acpi-cpufreq.c                |   5 +-
 drivers/cpufreq/cpufreq-cpu0.c                |  10 +-
 drivers/cpufreq/cpufreq.c                     | 116 ++--
 drivers/cpufreq/cpufreq_drv_ops.c             | 196 ++++++
 drivers/cpufreq/cpufreq_drv_ops.h             |  54 ++
 drivers/cpufreq/cpufreq_governor.c            |   4 +-
 drivers/cpufreq/xen-cpufreq.c                 | 869 ++++++++++++++++++++++++++
 include/linux/cpufreq.h                       |   2 +-
 include/linux/opp.h                           |   2 +-
 include/xen/interface/platform.h              |   1 +
 include/xen/interface/sysctl.h                | 646 +++++++++++++++++++
 include/xen/interface/xen.h                   |   7 +
 21 files changed, 1931 insertions(+), 68 deletions(-)
 create mode 100644 drivers/cpufreq/cpufreq_drv_ops.c
 create mode 100644 drivers/cpufreq/cpufreq_drv_ops.h
 create mode 100644 drivers/cpufreq/xen-cpufreq.c
 create mode 100644 include/xen/interface/sysctl.h

-- 
1.9.1


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