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Dave Martin 7fe31d28e8 ARM: mcpm: introduce helpers for platform coherency exit/setup 
This provides helper methods to coordinate between CPUs coming down
and CPUs going up, as well as documentation on the used algorithms,
so that cluster teardown and setup
operations are not done for a cluster simultaneously.

For use in the power_down() implementation:
  * __mcpm_cpu_going_down(unsigned int cluster, unsigned int cpu)
  * __mcpm_outbound_enter_critical(unsigned int cluster)
  * __mcpm_outbound_leave_critical(unsigned int cluster)
  * __mcpm_cpu_down(unsigned int cluster, unsigned int cpu)

The power_up_setup() helper should do platform-specific setup in
preparation for turning the CPU on, such as invalidating local caches
or entering coherency.  It must be assembler for now, since it must
run before the MMU can be switched on.  It is passed the affinity level
for which initialization should be performed.

Because the mcpm_sync_struct content is looked-up and modified
with the cache enabled or disabled depending on the code path, it is
crucial to always ensure proper cache maintenance to update main memory
right away.  The sync_cache_*() helpers are used to that end.

Also, in order to prevent a cached writer from interfering with an
adjacent non-cached writer, we ensure each state variable is located to
a separate cache line.

Thanks to Nicolas Pitre and Achin Gupta for the help with this
patch.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
 		2013-04-24 10:37:00 -04:00
..
.gitignore
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Makefile ARM: psci: add support for PSCI invocations from the kernel 2013-01-10 21:10:20 +00:00
arch_timer.c ARM: arch_timer: include linux/errno.h 2013-02-15 19:32:03 +01:00
armksyms.c Merge branches 'audit', 'delay', 'fixes', 'misc' and 'sta2x11' into for-linus 2012-07-27 23:06:32 +01:00
arthur.c
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asm-offsets.c ARM: mcpm: introduce helpers for platform coherency exit/setup 2013-04-24 10:37:00 -04:00
atags.h ARM: 7506/1: allow for ATAGS to be configured out when DT support is selected 2012-09-03 22:56:15 +01:00
atags_compat.c ARM: 7505/1: split out ATAGS parsing 2012-09-03 22:55:56 +01:00
atags_parse.c ARM: 7505/1: split out ATAGS parsing 2012-09-03 22:55:56 +01:00
atags_proc.c ARM: 7505/1: split out ATAGS parsing 2012-09-03 22:55:56 +01:00
bios32.c ARM: 7648/1: pci: Allow passing per-controller private data 2013-02-16 17:54:25 +00:00
calls.S ARM: 7665/1: Wire up kcmp syscall 2013-03-03 22:54:18 +00:00
cpuidle.c cpuidle: Add common time keeping and irq enabling 2012-03-21 01:59:40 -04:00
crash_dump.c crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn 2011-03-23 19:47:19 -07:00
debug.S ARM: compile fix for DEBUG_LL=y && MMU=n 2013-01-16 14:30:06 -08:00
devtree.c ARM: 7585/1: kernel: fix nr_cpu_ids check in DT logical map init 2012-11-23 13:01:31 +00:00
dma-isa.c ARM: dma-isa: request cascade channel after registering it 2009-12-24 18:34:08 +00:00
dma.c locking, ARM: Annotate low level hw locks as raw 2011-09-13 11:12:14 +02:00
early_printk.c ARM: Add an earlyprintk debug console 2009-12-09 10:02:18 +00:00
elf.c Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
entry-armv.S ARM: Fix undefined instruction exception handling 2012-07-31 12:04:30 +01:00
entry-common.S arm: switch to generic sigaltstack 2013-02-03 18:15:46 -05:00
entry-header.S Merge branch 'devel-stable' into for-next 2011-07-22 23:09:07 +01:00
etm.c ARM: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
fiq.c ARM: fiq: change FIQ_START to a variable 2012-07-01 21:59:19 +08:00
fiqasm.S ARM: 6938/1: fiq: Refactor {get,set}_fiq_regs() for Thumb-2 2011-05-26 10:31:06 +01:00
ftrace.c ARM: 7468/1: ftrace: Trace function entry before updating index 2012-07-31 10:30:42 +01:00
head-common.S arm/dt: Make __vet_atags also accept a dtb image 2011-05-11 15:12:32 +02:00
head-nommu.S ARM: 7591/1: nommu: Enable the strict alignment (CR_A) bit only if ARCH < v6 2012-12-07 11:48:57 +00:00
head.S ARM: 7657/1: head: fix swapper and idmap population with LPAE and big-endian 2013-03-03 22:54:13 +00:00
hw_breakpoint.c ARM: 7662/1: hw_breakpoint: reset debug logic on secondary CPUs in s2ram resume 2013-03-03 22:54:16 +00:00
hyp-stub.S ARM: virt: simplify __hyp_stub_install epilog 2013-01-10 21:08:55 +00:00
insn.c ARM: fix missing bug.h include in arch/arm/kernel/insn.c 2012-03-30 11:51:46 +01:00
insn.h ARM: 7334/1: add jump label support 2012-03-24 09:38:56 +00:00
io.c arm: convert core files from module.h to export.h 2011-10-31 19:30:49 -04:00
irq.c arm: add set_handle_irq() to register the parent IRQ controller handler function 2013-01-10 11:44:38 -06:00
isa.c sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
iwmmxt.S ARM: pxa: fix logic error in PJ4 iWMMXt handling 2011-08-11 10:10:26 +08:00
jump_label.c ARM: 7334/1: add jump label support 2012-03-24 09:38:56 +00:00
kgdb.c kgdb,arm: fix register dump 2010-10-29 13:14:40 -05:00
kprobes-arm.c ARM: 7181/1: Restrict kprobes probing SWP instructions to ARMv5 and below 2011-11-30 23:54:54 +00:00
kprobes-common.c Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
kprobes-test-arm.c ARM: kprobes: make more tests conditional 2012-10-09 17:07:43 +02:00
kprobes-test-thumb.c ARM: 7174/1: Fix build error in kprobes test code on Thumb2 kernels 2011-11-26 21:58:53 +00:00
kprobes-test.c treewide: fix printk typo in multiple drivers 2012-11-19 11:08:17 +01:00
kprobes-test.h ARM: 7174/1: Fix build error in kprobes test code on Thumb2 kernels 2011-11-26 21:58:53 +00:00
kprobes-thumb.c ARM: 7423/1: kprobes: run t32_simulate_ldr_literal() without insn slot 2012-06-14 15:11:44 +01:00
kprobes.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
kprobes.h ARM: kprobes: Add exports for test code 2011-09-20 18:17:43 +00:00
machine_kexec.c ARM: 7555/1: kexec: fix segment memory addresses check 2012-10-18 11:05:19 +01:00
module.c ARM: 7059/1: LPAE: Use PMD_(SHIFT|SIZE|MASK) instead of PGDIR_* 2011-08-23 15:30:33 +01:00
opcodes.c ARM: 7206/1: Add generic ARM instruction set condition code checks. 2011-12-13 08:52:02 +00:00
patch.c ARM: 7332/1: extract out code patch function from kprobes 2012-03-24 09:38:55 +00:00
patch.h ARM: 7332/1: extract out code patch function from kprobes 2012-03-24 09:38:55 +00:00
perf_event.c ARM: 7667/1: perf: Fix section mismatch on armpmu_init() 2013-03-06 23:45:43 +00:00
perf_event_cpu.c ARM: perf: handle armpmu_register failing 2013-01-18 13:46:09 +00:00
perf_event_v6.c ARM: perf: don't pretend to support counting of L1I writes 2013-01-16 12:01:59 +00:00
perf_event_v7.c ARM: 7663/1: perf: fix ARMv7 EVTYPE_MASK to include NSH bit 2013-03-03 22:54:17 +00:00
perf_event_xscale.c ARM: perf: don't pretend to support counting of L1I writes 2013-01-16 12:01:59 +00:00
pj4-cp0.c arm: remove several unnecessary module.h include instances 2011-10-31 19:30:48 -04:00
process.c ARM idle: delete pm_idle 2013-02-17 23:37:04 -05:00
psci.c ARM: psci: add support for PSCI invocations from the kernel 2013-01-10 21:10:20 +00:00
ptrace.c ARM: 7595/1: syscall: rework ordering in syscall_trace_exit 2012-12-11 00:18:26 +00:00
relocate_kernel.S ARM: 7065/1: kexec: ensure new kernel is entered in ARM state 2011-08-28 10:39:41 +01:00
return_address.c arm: convert core files from module.h to export.h 2011-10-31 19:30:49 -04:00
sched_clock.c ARM: 7643/1: sched: correct update_sched_clock() 2013-02-11 17:33:08 +00:00
setup.c ARM: 7602/1: Pass real "__machine_arch_type" variable to setup_machine_tags() procedure 2012-12-16 10:04:24 +00:00
signal.c arm: switch to struct ksignal * passing 2013-02-14 09:21:16 -05:00
signal.h ARM: 7471/1: Revert "7442/1: Revert "remove unused restart trampoline"" 2012-07-28 11:11:51 +01:00
sleep.S Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
smp.c ARM: 7674/1: smp: Avoid dummy clockevent being preferred over real hardware clock-event 2013-03-15 17:19:31 +00:00
smp_scu.c ARM: scu: mask cluster id from cpu_logical_map 2013-01-31 13:54:16 -06:00
smp_tlb.c ARM: 7660/1: tlb: add branch predictor maintenance operations 2013-03-03 22:54:15 +00:00
smp_twd.c ARM: 7655/1: smp_twd: make twd_local_timer_of_register() no-op for nosmp 2013-03-03 22:54:12 +00:00
stacktrace.c arm: convert core files from module.h to export.h 2011-10-31 19:30:49 -04:00
suspend.c ARM: 7661/1: mm: perform explicit branch predictor maintenance when required 2013-03-03 22:54:16 +00:00
swp_emulate.c ARM: missing ->mmap_sem around find_vma() in swp_emulate.c 2012-12-20 10:40:24 +00:00
sys_arm.c arm: switch to generic fork/vfork/clone 2012-11-28 22:13:54 -05:00
sys_oabi-compat.c userns: Convert stat to return values mapped from kuids and kgids 2012-05-15 14:08:35 -07:00
tcm.c Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
tcm.h
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thumbee.c ARM: 7385/1: ThumbEE: Use cpuid macros to read ID_PFR0 for ThumbEE 2012-04-25 19:49:26 +01:00
time.c ARM: delete struct sys_timer 2012-12-24 09:36:38 -07:00
topology.c ARM: kernel: update topology to use new MPIDR macros 2012-11-19 15:44:33 +00:00
traps.c taint: add explicit flag to show whether lock dep is still OK. 2013-01-21 17:17:57 +10:30
unwind.c ARM: unwinder: fix bisection to find origin in .idx section 2011-12-15 14:02:19 -08:00
vmlinux.lds.S ARM: Section based HYP idmap 2013-01-23 13:29:09 -05:00
xscale-cp0.c arm: remove several unnecessary module.h include instances 2011-10-31 19:30:48 -04:00