[RFC PATCH 17/17] ARM: kernel: save/restore build infrastructure

[Amit Kachhap]

On 7 July 2011 21:20, Lorenzo Pieralisi <lorenzo.pieralisi at arm.com> wrote:
> This patch adds the required Kconfig and Makefile entries to
> enable and compile common idle code for ARM kernel.
>
> Common idle code depends on CPU_PM platform notifiers to trigger
> save/restore of kernel subsystems like PMU, VFP, GIC.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> ---
>  arch/arm/Kconfig         |   11 +++++++++++
>  arch/arm/kernel/Makefile |    4 ++++
>  2 files changed, 15 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 356f266..5b670bd 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1992,6 +1992,17 @@ config VFP
>
>          Say N if your target does not have VFP hardware.
>
> +config CONTEXT_SR
> +       bool "Save/Restore code support for CPU/Cluster Power Management"
> +       depends on CPU_V7 && CPU_PM
> +       help
> +         Say Y to include Save/Restore code in the kernel. This provides
> +         generic infrastructure to put the code in dormant/shutdown mode
> +         and save/restore the required system state inclusive of L2 cache
> +         logic.
> +
> +         Say N if your target does not have Power Management hardware.
> +

Currently this is placed inside the "Floating point emulation" menu.
"cpu power management" menu may be a better option.
Also I did not find where configs CPU_PM,  ARCH_USES_CPU_PM are enabled.

>  config VFPv3
>        bool
>        depends on VFP
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index 8b42d58..ac931f1 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -49,6 +49,10 @@ obj-$(CONFIG_CRASH_DUMP)     += crash_dump.o
>  obj-$(CONFIG_SWP_EMULATE)      += swp_emulate.o
>  CFLAGS_swp_emulate.o           := -Wa,-march=armv7-a
>  obj-$(CONFIG_HAVE_HW_BREAKPOINT)       += hw_breakpoint.o
> +obj-$(CONFIG_CONTEXT_SR)       +=      lb_lock.o sr_api.o sr_mapping.o \
> +                                       sr_entry.o  sr_arch.o  sr_context.o \
> +                                       sr_platform.o sr_power.o reset_v7.o \
> +                                       sr_v7_helpers.o
>
>  obj-$(CONFIG_CRUNCH)           += crunch.o crunch-bits.o
>  AFLAGS_crunch-bits.o           := -Wa,-mcpu=ep9312
> --
> 1.7.4.4
>
>
>