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Mark Rutland 714c21cb90 clocksource: arch_timer: use virtual counters 
commit 0d651e4e65 upstream.

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 <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-09 12:24:26 -08:00
..
hardware
Merge tag 'cleanup-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2013-05-07 11:22:14 -07:00
mach
Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm
2013-05-03 09:13:19 -07:00
xen
xen/arm: implement HYPERVISOR_vcpu_op
2013-04-25 16:46:07 +00:00
arch_timer.h
clocksource: arch_timer: use virtual counters
2014-01-09 12:24:26 -08:00
asm-offsets.h
kbuild: move asm-offsets.h to include/generated
2009-12-12 13:08:14 +01:00
assembler.h
ARM: virt: avoid clobbering lr when forcing svc mode
2013-01-10 21:09:31 +00:00
atomic.h
ARM: 7687/1: atomics: don't use exclusives for atomic64 read/set with LPAE
2013-04-03 17:00:00 +01:00
barrier.h
ARM: kill off arch_is_coherent
2012-10-02 08:58:07 +02:00
bitops.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
bug.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
bugs.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
cache.h
ARM: implement support for read-mostly sections
2010-12-05 08:39:36 +00:00
cacheflush.h
ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
2013-06-17 10:30:52 +01:00
cachetype.h
ARM: 7062/1: cache: detect PIPT I-cache using CTR
2011-10-17 09:13:41 +01:00
checksum.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
clkdev.h
ARM: Consolidate the clkdev header files
2011-07-19 18:09:45 +02:00
cmpxchg.h
ARM: 7720/1: ARM v6/v7 cmpxchg64 shouldn't clear upper 32 bits of the old/new value
2013-05-13 23:42:24 +01:00
compiler.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
cp15.h
ARM: make cr_alignment read-only #ifndef CONFIG_CPU_CP15
2013-01-31 21:44:45 +01:00
cpu.h
ARM: kernel: add MIDR to per-CPU information data
2012-11-19 14:51:11 +00:00
cpuidle.h
cpuidle: Add common time keeping and irq enabling
2012-03-21 01:59:40 -04:00
cputype.h
ARM: 7763/1: kernel: fix __cpu_logical_map default initialization
2013-06-24 14:28:43 +01:00
cti.h
ARM: coresight: common definition for (OS) Lock Access Register key value
2013-01-10 21:13:05 +00:00
delay.h
ARM: 7685/1: delay: use private ticks_per_jiffy field for timer-based delay ops
2013-04-03 16:45:50 +01:00
device.h
ARM: dma-mapping: Add macro to_dma_iommu_mapping()
2013-02-25 15:30:41 +01:00
div64.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
dma-contiguous.h
ARM: integrate CMA with DMA-mapping subsystem
2012-05-21 15:09:38 +02:00
dma-iommu.h
ARM: dma-mapping: Add arm_iommu_detach_device()
2013-02-25 15:30:41 +01:00
dma-mapping.h
Merge tag 'iommu-updates-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
2012-12-20 10:07:25 -08:00
dma.h
ARM: disable virt_to_bus/virt_to_bus almost everywhere
2013-02-14 15:04:33 +01:00
domain.h
ARM: fix set_domain() macro
2012-07-05 09:50:55 +01:00
ecard.h
ARM: io: ecard: move ioaddr() inside __ecard_address
2011-08-17 08:44:16 +01:00
edac.h
ARM: 7201/1: add EDAC atomic_scrub function
2011-12-11 08:35:50 +00:00
elf.h
ARM: fix nommu builds with 48be69a02 (ARM: move signal handlers into a vdso-like page)
2013-08-11 18:35:20 -07:00
entry-macro-multi.S
ARM: gic: consolidate PPI handling
2011-10-23 13:32:29 +01:00
exception.h
ARM: 7115/4: move __exception and friends to asm/exception.h
2011-10-17 09:02:44 +01:00
fb.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
fiq.h
ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume
2011-05-26 10:31:06 +01:00
firmware.h
ARM: Add interface for registering and calling firmware-specific operations
2013-04-09 01:52:06 +09:00
fixmap.h
[ARM] fixmap support
2009-03-15 21:01:20 -04:00
flat.h
ARM: binfmt_flat: unused variable 'persistent'
2012-10-09 20:29:06 +02:00
floppy.h
[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach
2008-08-07 09:55:48 +01:00
fncpy.h
ARM: 6640/1: Thumb-2: Symbol manipulation macros for function body copying
2011-01-27 11:48:58 +00:00
fpstate.h
Fix common misspellings
2011-03-31 11:26:23 -03:00
ftrace.h
ARM: 6319/1: ftrace: add Thumb-2 support to dynamic ftrace
2010-09-02 15:28:43 +01:00
futex.h
ARM: 7425/1: extable: ensure fixup entries are 4-byte aligned
2012-06-16 16:30:25 +01:00
glue-cache.h
ARM: cache: remove ARMv3 support code
2013-03-26 09:55:23 +00:00
glue-df.h
ARM: sync comments about available data abort models with the code
2013-01-31 21:44:46 +01:00
glue-pf.h
ARM: move cache/processor/fault glue to separate include files
2011-02-12 11:52:21 +00:00
glue-proc.h
ARM: 7773/1: PJ4B: Add support for errata 4742
2013-06-24 14:28:46 +01:00
glue.h
Fix common misspellings
2011-03-31 11:26:23 -03:00
gpio.h
ARM: make mach/gpio.h headers optional
2012-09-14 09:21:59 -05:00
hardirq.h
ARM: 7536/1: smp: Formalize an IPI for wakeup
2012-09-19 21:52:08 +01:00
highmem.h
ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181 (TLBI/DSB operations)
2013-04-03 16:45:49 +01:00
hw_breakpoint.h
ARM: hw_breakpoint: Check function for OS Save and Restore mechanism
2013-01-10 21:13:06 +00:00
hw_irq.h
arm: dove: Use proper irq accessor functions
2011-03-29 14:47:57 +02:00
hwcap.h
UAPI: (Scripted) Disintegrate arch/arm/include/asm
2012-10-12 13:05:52 +01:00
hypervisor.h
arm: initial Xen support
2012-09-14 13:53:39 +00:00
ide.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
idmap.h
ARM: KVM: move to a KVM provided HYP idmap
2013-04-28 22:23:08 -07:00
io.h
Merge 3.7-rc6 into char-misc-next
2012-11-16 18:21:36 -08:00
irq.h
arm: Move the set_handle_irq and handle_arch_irq declarations to asm/irq.h
2013-03-26 16:11:20 +00:00
irqflags.h
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
jump_label.h
compiler/gcc4: Add quirk for 'asm goto' miscompilation bug
2013-10-18 07:45:45 -07:00
Kbuild
Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm
2012-12-12 11:30:02 -08:00
kexec.h
[ARM] add machine-specific hook to machine_kexec
2011-03-03 16:26:55 -05:00
kgdb.h
kgdb,arm: fix register dump
2010-10-29 13:14:40 -05:00
kmap_types.h
arm: remove km_type definitions
2012-07-24 15:27:28 +08:00
kprobes.h
Kernel: Audit Support For The ARM Platform
2012-01-17 16:17:01 -05:00
kvm_arch_timer.h
ARM: KVM: arch_timers: Add guest timer core support
2013-02-11 19:05:11 +00:00
kvm_arm.h
ARM: KVM: abstract S1TW abort detection away
2013-03-06 15:48:42 -08:00
kvm_asm.h
ARM: KVM: perform save/restore of PAR
2013-08-20 08:43:03 -07:00
kvm_coproc.h
KVM: ARM: User space API for getting/setting co-proc registers
2013-01-23 13:29:14 -05:00
kvm_emulate.h
ARM: KVM: move kvm_handle_wfi to handle_exit.c
2013-03-06 15:48:45 -08:00
kvm_host.h
ARM: KVM: promote vfp_host pointer to generic host cpu context
2013-04-28 22:23:13 -07:00
kvm_mmio.h
KVM: ARM: Handle I/O aborts
2013-01-23 13:29:17 -05:00
kvm_mmu.h
ARM: KVM: perform HYP initilization for hotplugged CPUs
2013-04-28 22:23:11 -07:00
kvm_psci.h
KVM: ARM: Power State Coordination Interface implementation
2013-01-23 13:29:18 -05:00
kvm_vgic.h
ARM: KVM: remove superfluous include from kvm_vgic.h
2013-03-06 15:48:44 -08:00
limits.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
linkage.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
localtimer.h
ARM: local timers: make the runtime registration interface mandatory
2012-03-13 13:45:55 +00:00
mach-types.h
arm: move mach-types to include/generated
2009-12-12 13:08:14 +01:00
mc146818rtc.h
ARM: mc146818rtc: remove unnecessary include of mach/irqs.h
2012-01-25 20:37:45 -06:00
mcpm.h
ARM: mcpm: provide an interface to set the SMP ops at run time
2013-04-24 10:37:03 -04:00
memblock.h
ARM: Add arm_memblock_steal() to allocate memory away from the kernel
2012-01-13 15:02:35 +00:00
memory.h
Merge tag 'fixes-non-critical' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2013-02-21 14:54:55 -08:00
mmu_context.h
ARM: 7790/1: Fix deferred mm switch on VIVT processors
2013-08-11 18:35:20 -07:00
mmu.h
ARM: 7790/1: Fix deferred mm switch on VIVT processors
2013-08-11 18:35:20 -07:00
module.h
Make most arch asm/module.h files use asm-generic/module.h
2012-09-28 14:31:03 +09:30
mtd-xip.h
[ARM] move asm/xip.h's mach/hardware.h include to mach/xip.h
2008-12-14 13:22:51 +00:00
mutex.h
ARM: 7495/1: mutex: use generic atomic_dec-based implementation for ARMv6+
2012-08-25 09:22:31 +01:00
nwflash.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
opcodes-sec.h
ARM: opcodes: add opcodes definitions for ARM security extensions
2013-01-10 21:10:20 +00:00
opcodes-virt.h
ARM: opcodes: add __ERET/__MSR_ELR_HYP instruction encoding
2012-09-19 08:32:49 +01:00
opcodes.h
ARM: opcodes: add missing include of linux/linkage.h
2013-01-10 21:10:20 +00:00
outercache.h
ARM: 7639/1: cache-l2x0: add missed dummy outer_resume entry
2013-02-06 09:33:07 +00:00
page-nommu.h
nommu: Remove the memory_start/end variables from ARM page-nommu.h
2009-07-24 12:35:01 +01:00
page.h
ARM: make vectors page inaccessible from userspace
2013-08-11 18:35:20 -07:00
pci.h
PCI: collapse pcibios_resource_to_bus
2012-02-23 20:19:04 -07:00
percpu.h
ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier()
2013-06-05 23:35:56 +01:00
perf_event.h
ARM: 7584/1: perf: fix link error when CONFIG_HW_PERF_EVENTS is not selected
2012-11-23 13:01:30 +00:00
pgalloc.h
ARM: LPAE: Page table maintenance for the 3-level format
2011-12-08 10:30:39 +00:00
pgtable-2level-hwdef.h
ARM: 7077/1: LPAE: Use a mask for physical addresses in page table entries
2011-10-06 15:40:06 +01:00
pgtable-2level-types.h
ARM: 7076/1: LPAE: Add (pte|pmd)val_t type definitions as u32
2011-10-06 15:40:05 +01:00
pgtable-2level.h
ARM: mm: introduce present, faulting entries for PAGE_NONE
2012-11-09 14:13:20 +00:00
pgtable-3level-hwdef.h
KVM: ARM: Hypervisor initialization
2013-01-23 13:29:10 -05:00
pgtable-3level-types.h
ARM: LPAE: Introduce the 3-level page table format definitions
2011-12-08 10:30:39 +00:00
pgtable-3level.h
ARM: KVM: fix L_PTE_S2_RDWR to actually be Read/Write
2013-04-16 16:21:25 -07:00
pgtable-hwdef.h
ARM: LPAE: Introduce the 3-level page table format definitions
2011-12-08 10:30:39 +00:00
pgtable-nommu.h
Remove remaining bits of io_remap_page_range()
2012-03-23 16:58:31 -07:00
pgtable.h
ARM: fix booting low-vectors machines
2013-12-11 22:36:26 -08:00
pmu.h
ARM: perf: consistently use arm_pmu->name for PMU name
2012-11-09 11:37:26 +00:00
proc-fns.h
ARM: LPAE: Page table maintenance for the 3-level format
2011-12-08 10:30:39 +00:00
processor.h
ARM: 7791/1: a.out: remove partial a.out support
2013-08-11 18:35:20 -07:00
procinfo.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
prom.h
Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm
2012-12-12 11:30:02 -08:00
psci.h
ARM: psci: add support for PSCI invocations from the kernel
2013-01-10 21:10:20 +00:00
ptrace.h
UAPI: (Scripted) Disintegrate arch/arm/include/asm
2012-10-12 13:05:52 +01:00
scatterlist.h
ARM: Allow SoCs to enable scatterlist chaining
2011-06-02 11:16:22 +01:00
sched_clock.h
ARM: make sched_clock just call a function pointer
2013-04-10 18:27:12 -05:00
seccomp.h
ARM: SECCOMP support
2010-10-01 22:32:18 -04:00
setup.h
UAPI: (Scripted) Disintegrate arch/arm/include/asm
2012-10-12 13:05:52 +01:00
shmparam.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
signal.h
arm: switch to generic old sigaction()
2013-02-03 18:15:47 -05:00
smp_plat.h
ARM: 7763/1: kernel: fix __cpu_logical_map default initialization
2013-06-24 14:28:43 +01:00
smp_scu.h
Merge tag 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2013-02-21 15:27:22 -08:00
smp_twd.h
ARM: smp_twd: convert to use CLKSRC_OF init
2013-03-11 08:42:08 -05:00
smp.h
ARM: 7571/1: SMP: add function arch_send_wakeup_ipi_mask()
2012-11-13 11:47:40 +00:00
sparsemem.h
[ARM] mm: enable sparsemem on clps7500 and RiscPC
2008-10-01 17:24:04 +01:00
spinlock_types.h
ARM: 7446/1: spinlock: use ticket algorithm for ARMv6+ locking implementation
2012-07-09 17:41:10 +01:00
spinlock.h
ARM: 7632/1: spinlock: avoid exclusive accesses on unlock() path
2013-01-28 14:13:05 +00:00
stackprotector.h
ARM: initial stack protector (-fstack-protector) support
2010-06-14 21:31:00 -04:00
stacktrace.h
[ARM] 5382/1: unwind: Reorganise the stacktrace support
2009-02-12 13:21:17 +00:00
string.h
[ARM] remove memzero()
2008-11-27 12:37:59 +00:00
suspend.h
ARM: pm: preallocate a page table for suspend/resume
2011-09-20 23:33:36 +01:00
swab.h
UAPI: (Scripted) Disintegrate arch/arm/include/asm
2012-10-12 13:05:52 +01:00
switch_to.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
sync_bitops.h
xen/arm: sync_bitops
2012-08-08 16:34:01 +00:00
syscall.h
ARM: 7851/1: check for number of arguments in syscall_get/set_arguments()
2013-11-04 04:31:06 -08:00
system_info.h
Disintegrate asm/system.h for ARM
2012-03-28 18:30:01 +01:00
system_misc.h
arm: Use generic idle loop
2013-04-08 17:39:24 +02:00
system.h
the only place that needs to include asm/exec.h is linux/binfmts.h
2012-09-20 09:51:13 -04:00
tcm.h
ARM: 6985/1: export functions to determine the presence of I/DTCM
2011-07-06 20:49:45 +01:00
therm.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
thread_info.h
ARM: 7790/1: Fix deferred mm switch on VIVT processors
2013-08-11 18:35:20 -07:00
thread_notify.h
ARM: 6867/1: Introduce THREAD_NOTIFY_COPY for copy_thread() hooks
2011-04-10 21:13:36 +01:00
timex.h
Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm
2012-10-07 21:20:57 +09:00
tlb.h
Fix TLB gather virtual address range invalidation corner cases
2013-08-20 08:43:05 -07:00
tlbflush.h
Merge branches 'devel-stable', 'entry', 'fixes', 'mach-types', 'misc' and 'smp-hotplug' into for-linus
2013-05-02 21:30:36 +01:00
tls.h
ARM: 7403/1: tls: remove covert channel via TPIDRURW
2012-04-28 11:01:30 +01:00
topology.h
ARM: 7182/1: ARM cpu topology: fix warning
2011-11-30 23:55:21 +00:00
traps.h
ARM: earlier initialization of vectors page
2012-01-23 10:24:11 +00:00
uaccess.h
ARM: warnings in arch/arm/include/asm/uaccess.h
2012-10-09 20:29:07 +02:00
ucontext.h
Fix common misspellings
2011-03-31 11:26:23 -03:00
unified.h
ARM: make BSYM macro assembly only
2012-01-16 08:56:25 -06:00
unistd.h
consolidate cond_syscall and SYSCALL_ALIAS declarations
2013-03-03 22:55:19 -05:00
unwind.h
ARM: 7187/1: fix unwinding for XIP kernels
2011-12-06 11:16:13 +00:00
user.h
ARM: 6798/1: aout-core: zero thread debug registers in a.out core dump
2011-03-10 15:16:29 +00:00
vfp.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00
vfpmacros.h
ARM: 7566/1: vfp: fix save and restore when running on pre-VFPv3 and CONFIG_VFPv3 set
2012-10-29 10:04:05 +00:00
vga.h
ARM: set vga memory base at run-time
2011-07-12 11:19:29 -05:00
virt.h
ARM: virt: use PSR_N_BIT for detecting boot CPU mode mismatch
2013-01-10 21:09:32 +00:00
word-at-a-time.h
ARM: 7450/1: dcache: select DCACHE_WORD_ACCESS for little-endian ARMv6+ CPUs
2012-07-09 17:41:11 +01:00
xor.h
[ARM] move include/asm-arm to arch/arm/include/asm
2008-08-02 21:32:35 +01:00