kernel/linux.git/drivers/clocksource/arm_arch_timer.c, branch v3.18.100

clocksource: arch_timer: Only use the virtual counter (CNTVCT) on arm64

2015-02-06T06:36:09+00:00

commit d6ad36913083d683aad4e02e53580c995f1a6ede upstream. Commit 0b46b8a718c6 (clocksource: arch_timer: Fix code to use physical timers when requested) introduces the use of physical counters in the ARM architected timer driver. However, he arm64 kernel uses CNTVCT in VDSO. When booting in EL2, the kernel switches to the physical timers to make things easier for KVM but it continues to use the virtual counter both in user and kernel. While in such scenario CNTVCT == CNTPCT (since CNTVOFF is initialised by the kernel to 0), we want to spot firmware bugs corrupting CNTVOFF early (which would affect CNTVCT). Signed-off-by: Catalin Marinas Tested-by: Yingjoe Chen Cc: Daniel Lezcano Signed-off-by: Arnd Bergmann Fixes: 0b46b8a718c6 ("clocksource: arch_timer: Fix code to use physical timers when requested") Cc: Ian Campbell Signed-off-by: Mark Rutland Signed-off-by: Greg Kroah-Hartman

clocksource: arch_timer: Fix code to use physical timers when requested

2015-01-08T18:30:15+00:00

commit 0b46b8a718c6e90910a1b1b0fe797be3c167e186 upstream. This is a bug fix for using physical arch timers when the arch_timer_use_virtual boolean is false. It restores the arch_counter_get_cntpct() function after removal in 0d651e4e "clocksource: arch_timer: use virtual counters" We need this on certain ARMv7 systems which are architected like this: * The firmware doesn't know and doesn't care about hypervisor mode and we don't want to add the complexity of hypervisor there. * The firmware isn't involved in SMP bringup or resume. * The ARCH timer come up with an uninitialized offset between the virtual and physical counters. Each core gets a different random offset. * The device boots in "Secure SVC" mode. * Nothing has touched the reset value of CNTHCTL.PL1PCEN or CNTHCTL.PL1PCTEN (both default to 1 at reset) One example of such as system is RK3288 where it is much simpler to use the physical counter since there's nobody managing the offset and each time a core goes down and comes back up it will get reinitialized to some other random value. Fixes: 0d651e4e65e9 ("clocksource: arch_timer: use virtual counters") Signed-off-by: Sonny Rao Acked-by: Catalin Marinas Acked-by: Daniel Lezcano Signed-off-by: Olof Johansson Signed-off-by: Greg Kroah-Hartman

ARM/ARM64: arch-timer: fix arch_timer_probed logic

2014-10-26T19:50:00+00:00

Commit c387f07e6205 (clocksource: arm_arch_timer: Discard unavailable timers correctly) changed the way the driver makes sure both the memory and system-register timers have been probed before finalizing the probing. There is a interesting flaw in this logic that leads to this final step never to be executed. Things seems to work pretty well until something actually needs the data that is produced during this final stage. For example, KVM explodes on the first run of a guest when executed on a platform that has both memory and sysreg nodes (Juno, for example). Just fix the damned logic, and enjoy booting VMs again. Tested on a Juno system. Cc: Sudeep Holla Cc: Stephen Boyd Cc: Mark Rutland Cc: Daniel Lezcano Cc: Christoffer Dall Reported-by: Riku Voipio Acked-by: Mark Rutland Acked-by: Sudeep Holla Tested-by: Sudeep Holla Signed-off-by: Marc Zyngier Signed-off-by: Daniel Lezcano

clocksource: arm_arch_timer: Consolidate arch_timer_evtstrm_enable

2014-09-28T23:59:26+00:00

The arch_timer_evtstrm_enable hooks in arm and arm64 are substantially similar, the only difference being a CONFIG_COMPAT-conditional section which is relevant only for arm64. Copy the arm64 version to the driver, removing the arch-specific hooks. Signed-off-by: Nathan Lynch Signed-off-by: Daniel Lezcano Acked-by: Will Deacon

clocksource: arm_arch_timer: Enable counter access for 32-bit ARM

2014-09-28T23:59:25+00:00

The only difference between arm and arm64's implementations of arch_counter_set_user_access is that 32-bit ARM does not enable user access to the virtual counter. We want to enable this access for the 32-bit ARM VDSO, so copy the arm64 version to the driver itself, and remove the arch-specific implementations. Signed-off-by: Nathan Lynch Signed-off-by: Daniel Lezcano Acked-by: Will Deacon

clocksource: arm_arch_timer: Change clocksource name if CP15 unavailable

2014-09-28T23:59:24+00:00

The arm and arm64 VDSOs need CP15 access to the architected counter. If this is unavailable (which is allowed by ARM v7), indicate this by changing the clocksource name to "arch_mem_counter" before registering the clocksource. Suggested by Stephen Boyd. Signed-off-by: Nathan Lynch Reviewed-by: Stephen Boyd Signed-off-by: Daniel Lezcano Acked-by: Will Deacon

clocksource: arm_arch_timer: Discard unavailable timers correctly

2014-09-28T23:50:05+00:00

Currently we wait until both cp15 and mem timers are probed if we have both timer device nodes present in the device tree without checking if the device is actually available. If one of the timer device node present is disabled, the system locks up on the boot as no timer gets registered. This patch adds the check for the availability of the timer device so that unavailable timers are discarded correctly. It also adds the missing of_node_put. Signed-off-by: Sudeep Holla Reviewed-by: Stephen Boyd Acked-by: Mark Rutland Signed-off-by: Daniel Lezcano

clocksource: arch_arm_timer: Fix age-old arch timer C3STOP detection issue

2014-04-29T13:06:36+00:00

ARM arch timers are tightly coupled with the CPU logic and lose context on platform implementing HW power management when cores are powered down at run-time. Marking the arch timers as C3STOP regardless of power management capabilities causes issues on platforms with no power management, since in that case the arch timers cannot possibly enter states where the timer loses context at runtime and therefore can always be used as a high resolution clockevent device. In order to fix the C3STOP issue in a way compliant with how real HW works, this patch adds a boolean property to the arch timer bindings to define if the arch timer is managed by an always-on power domain. This power domain is present on all ARM platforms to date, and manages HW that must not be turned off, whatever the state of other HW components (eg power controller). On platforms with no power management capabilities, it is the only power domain present, which encompasses and manages power supply for all HW components in the system. If the timer is powered by the always-on power domain, the always-on property must be present in the bindings which means that the timer cannot be shutdown at runtime, so it is not a C3STOP clockevent device. If the timer binding does not contain the always-on property, the timer is assumed to be power-gateable, hence it must be defined as a C3STOP clockevent device. Cc: Daniel Lezcano Cc: Magnus Damm Cc: Marc Carino Cc: Mark Rutland Acked-by: Marc Zyngier Acked-by: Rob Herring Signed-off-by: Lorenzo Pieralisi Signed-off-by: Daniel Lezcano

clocksource: arch_timer: Set dynamic irq affinity on mmio clockevent

2014-03-11T22:04:39+00:00

Set the CLOCK_EVT_FEAT_DYNIRQ flag on the memory mapped clockevent so that we save power by waking up the CPU with the next event when this timer is used in broadcast mode. Signed-off-by: Stephen Boyd Signed-off-by: Daniel Lezcano

clocksource: arch_timer: Do not register arch_sys_counter twice

2013-10-16T06:30:03+00:00

Commit: 65cd4f6 ("arch_timer: Move to generic sched_clock framework") added code to register the arch_sys_counter in arch_timer_register(), but it is already registered in arch_counter_register(). This results in the timer being added to the clocksource list twice, therefore causing an infinite loop in the list. Remove the duplicate registration and register the scheduler clock after the original registration instead. This fixes a hang during boot on Tegra114 (Cortex-A15). [ While I've only tested this on Tegra114, I suspect the same hang during boot happens for all processors that use this clock source. ] Signed-off-by: Thierry Reding Acked-by: John Stultz Cc: Stephen Boyd Cc: Will Deacon Cc: Stephen Warren Cc: linux-arm-kernel@lists.infradead.org Cc: Daniel Lezcano Link: http://lkml.kernel.org/r/1381843911-31962-1-git-send-email-treding@nvidia.com Signed-off-by: Ingo Molnar