07 Jun, 2013
1 commit
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Switching between reading the virtual or physical counters is
problematic, as some core code wants a view of time before we're fully
set up. Using a function pointer and switching the source after the
first read can make time appear to go backwards, and having a check in
the read function is an unfortunate block on what we want to be a fast
path.Instead, this patch makes us always use the virtual counters. If we're a
guest, or don't have hyp mode, we'll use the virtual timers, and as such
don't care about CNTVOFF as long as it doesn't change in such a way as
to make time appear to travel backwards. As the guest will use the
virtual timers, a (potential) KVM host must use the physical timers
(which can wake up the host even if they fire while a guest is
executing), and hence a host must have CNTVOFF set to zero so as to have
a consistent view of time between the physical timers and virtual
counters.Signed-off-by: Mark Rutland
Acked-by: Catalin Marinas
Acked-by: Marc Zyngier
Acked-by: Santosh Shilimkar
Cc: Rob Herring
12 Apr, 2013
1 commit
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This converts arm and arm64 to use CLKSRC_OF DT based initialization for
the arch timer. A new function arch_timer_arch_init is added to allow for
arch specific setup.This has a side effect of enabling sched_clock on omap5 and exynos5. There
should not be any reason not to use the arch timers for sched_clock.Signed-off-by: Rob Herring
Cc: Russell King
Cc: Kukjin Kim
Cc: Tony Lindgren
Cc: Simon Horman
Cc: Magnus Damm
Cc: Catalin Marinas
Cc: Will Deacon
Cc: John Stultz
Cc: Thomas Gleixner
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Acked-by: Santosh Shilimkar
12 Feb, 2013
1 commit
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Fixes:
In file included from arch/arm/include/asm/arch_timer.h:10:0,
from arch/arm/mach-shmobile/timer.c:23:
include/clocksource/arm_arch_timer.h:56:28: warning: 'arch_timer_get_timecounter' defined but not used [-Wunused-function]Signed-off-by: Olof Johansson
31 Jan, 2013
1 commit
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The core functionality of the arch_timer driver is not directly tied to
anything under arch/arm, and can be split out.This patch factors out the core of the arch_timer driver, so it can be
shared with other architectures. A couple of functions are added so
that architecture-specific code can interact with the driver without
needing to touch its internals.The ARM_ARCH_TIMER config variable is moved out to
drivers/clocksource/Kconfig, existing uses in arch/arm are replaced with
HAVE_ARM_ARCH_TIMER, which selects it.Signed-off-by: Mark Rutland
Acked-by: Catalin Marinas
Acked-by: Marc Zyngier