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SubjectRe: [PATCH v6 RESEND 0/5] ARM/ARM64 architected timer updates
On 09/18/2013 01:05 PM, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>
> Hi Olof/Kevin,

Added Olof and Kevin in Cc.

> I am reposting this series as suggested by Olof[1]. This is reviewed and
> acked by Will and Catalin. Daniel needs Ack from arm-soc maintainers
> to take these through his tree. Can you review this ?
>
> Regards,
> Sudeep
> [1] http://www.spinics.net/lists/arm-kernel/msg270926.html
> -----------
>
> This patch series adds support to configure the rate and enable the
> event stream for architected timer. The event streams can be used to
> impose a timeout on a wfe, to safeguard against any programming error
> in case an expected event is not generated or even to implement
> wfe-based timeouts for userspace locking implementations. This feature
> can be disabled(enabled by default).
>
> Since the timer control register is reset to zero on warm boot, CPU
> PM notifier is added to save and restore the value.
>
> Changes v5->v6:
> 1. Disabling event stream by default on boot and enable it
> only if CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
> This removes runtime configuration of timer event stream.
> 2. Moved COMPAT_ELF_HWCAP_DEFAULT to arch/arm64/kernel/setup.c
>
> Changes v4->v5:
> 1. Removed compat_dyn_elf_hwcap and used just compat_elf_hwcap as per
> Catalin's suggestion
> 2. Instead of resetting event stream in CPU PM callbacks, saving and
> restoring counter control register now.
>
> Changes v3->v4:
> 1. Added a config option to en/disable the timer event stream feature.
> Due to this the ordering of the patches as well as some cosmetic
> code changes are done.( So dropped previous reviewed-by tags)
> 2. Removed exporting compat_dyn_elf_hwcap as there are no modules
> requiring it for now.
>
> Changes v2->v3:
> 1. Moved ARM and ARM64 changes into separate patches
> 2. Added native hwcaps definations(ARM/ARM64) and compat-specific
> definitions(ARM64) to the users for the event stream feature.
>
> Changes v1->v2:
> 1. Saved event stream divider value on cold reset path and re-used it
> in CPU PM notifier instead of calculating every time.
> 2. Rebased on v3.11-rc2(to avoid conflicts with __cpuinit* deletion)
> 3. Dropped "ARM/ARM64: arch_timer: remove __cpuinit attribute for
> arch_counter_set_user_access"(already done as part of __cpuinit*
> deletion)
>
> Sudeep KarkadaNagesha (4):
> ARM/ARM64: arch_timer: add macros for bits in control register
> ARM: arch_timer: add support to configure and enable event stream
> ARM64: arch_timer: add support to configure and enable event stream
> drivers: clocksource: add CPU PM notifier for ARM architected timer
>
> Will Deacon (1):
> drivers: clocksource: add support for ARM architected timer event
> stream
>
> arch/arm/include/asm/arch_timer.h | 36 ++++++++++++++++++++++----
> arch/arm/include/uapi/asm/hwcap.h | 1 +
> arch/arm/kernel/setup.c | 1 +
> arch/arm64/include/asm/arch_timer.h | 42 ++++++++++++++++++++++++++-----
> arch/arm64/include/asm/hwcap.h | 11 ++++----
> arch/arm64/include/uapi/asm/hwcap.h | 1 +
> arch/arm64/kernel/setup.c | 11 ++++++++
> drivers/clocksource/Kconfig | 15 +++++++++++
> drivers/clocksource/arm_arch_timer.c | 49 ++++++++++++++++++++++++++++++++++++
> include/clocksource/arm_arch_timer.h | 10 ++++++++
> 10 files changed, 161 insertions(+), 16 deletions(-)
>


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