On 29/08/13 15:55, Sudeep KarkadaNagesha wrote: > From: Sudeep KarkadaNagesha <sudeep.karkadanage...@arm.com> > > 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. > Hi Russell,
Can you have a look at this series ? If you are OK, can I have your ACK on arm specific changes(PATCH 2/5) ? Regards, Sudeep > 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) > > Regards, > Sudeep > > > 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 | 14 +++++++++++ > drivers/clocksource/arm_arch_timer.c | 49 > ++++++++++++++++++++++++++++++++++++ > include/clocksource/arm_arch_timer.h | 10 ++++++++ > 10 files changed, 160 insertions(+), 16 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
