/* * arch/arm/include/asm/mcpm.h * * Created by: Nicolas Pitre, April 2012 * Copyright: (C) 2012-2013 Linaro Limited * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef MCPM_H #define MCPM_H /* * Maximum number of possible clusters / CPUs per cluster. * * This should be sufficient for quite a while, while keeping the * (assembly) code simpler. When this starts to grow then we'll have * to consider dynamic allocation. */ #define MAX_CPUS_PER_CLUSTER 4 #ifdef CONFIG_MCPM_QUAD_CLUSTER #define MAX_NR_CLUSTERS 4 #else #define MAX_NR_CLUSTERS 2 #endif #ifndef __ASSEMBLY__ #include <linux/types.h> #include <asm/cacheflush.h> /* * Platform specific code should use this symbol to set up secondary * entry location for processors to use when released from reset. */ extern void mcpm_entry_point(void); /* * This is used to indicate where the given CPU from given cluster should * branch once it is ready to re-enter the kernel using ptr, or NULL if it * should be gated. A gated CPU is held in a WFE loop until its vector * becomes non NULL. */ void mcpm_set_entry_vector(unsigned cpu, unsigned cluster, void *ptr); /* * This sets an early poke i.e a value to be poked into some address * from very early assembly code before the CPU is ungated. The * address must be physical, and if 0 then nothing will happen. */ void mcpm_set_early_poke(unsigned cpu, unsigned cluster, unsigned long poke_phys_addr, unsigned long poke_val); /* * CPU/cluster power operations API for higher subsystems to use. */ /** * mcpm_is_available - returns whether MCPM is initialized and available * * This returns true or false accordingly. */ bool mcpm_is_available(void); /** * mcpm_cpu_power_up - make given CPU in given cluster runable * * @cpu: CPU number within given cluster * @cluster: cluster number for the CPU * * The identified CPU is brought out of reset. If the cluster was powered * down then it is brought up as well, taking care not to let the other CPUs * in the cluster run, and ensuring appropriate cluster setup. * * Caller must ensure the appropriate entry vector is initialized with * mcpm_set_entry_vector() prior to calling this. * * This must be called in a sleepable context. However, the implementation * is strongly encouraged to return early and let the operation happen * asynchronously, especially when significant delays are expected. * * If the operation cannot be performed then an error code is returned. */ int mcpm_cpu_power_up(unsigned int cpu, unsigned int cluster); /** * mcpm_cpu_power_down - power the calling CPU down * * The calling CPU is powered down. * * If this CPU is found to be the "last man standing" in the cluster * then the cluster is prepared for power-down too. * * This must be called with interrupts disabled. * * On success this does not return. Re-entry in the kernel is expected * via mcpm_entry_point. * * This will return if mcpm_platform_register() has not been called * previously in which case the caller should take appropriate action. * * On success, the CPU is not guaranteed to be truly halted until * mcpm_wait_for_cpu_powerdown() subsequently returns non-zero for the * specified cpu. Until then, other CPUs should make sure they do not * trash memory the target CPU might be executing/accessing. */ void mcpm_cpu_power_down(void); /** * mcpm_wait_for_cpu_powerdown - wait for a specified CPU to halt, and * make sure it is powered off * * @cpu: CPU number within given cluster * @cluster: cluster number for the CPU * * Call this function to ensure that a pending powerdown has taken * effect and the CPU is safely parked before performing non-mcpm * operations that may affect the CPU (such as kexec trashing the * kernel text). * * It is *not* necessary to call this function if you only need to * serialise a pending powerdown with mcpm_cpu_power_up() or a wakeup * event. * * Do not call this function unless the specified CPU has already * called mcpm_cpu_power_down() or has committed to doing so. * * @return: * - zero if the CPU is in a safely parked state * - nonzero otherwise (e.g., timeout) */ int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster); /** * mcpm_cpu_suspend - bring the calling CPU in a suspended state * * The calling CPU is suspended. This is similar to mcpm_cpu_power_down() * except for possible extra platform specific configuration steps to allow * an asynchronous wake-up e.g. with a pending interrupt. * * If this CPU is found to be the "last man standing" in the cluster * then the cluster may be prepared for power-down too. * * This must be called with interrupts disabled. * * On success this does not return. Re-entry in the kernel is expected * via mcpm_entry_point. * * This will return if mcpm_platform_register() has not been called * previously in which case the caller should take appropriate action. */ void mcpm_cpu_suspend(void); /** * mcpm_cpu_powered_up - housekeeping workafter a CPU has been powered up * * This lets the platform specific backend code perform needed housekeeping * work. This must be called by the newly activated CPU as soon as it is * fully operational in kernel space, before it enables interrupts. * * If the operation cannot be performed then an error code is returned. */ int mcpm_cpu_powered_up(void); /* * Platform specific callbacks used in the implementation of the above API. * * cpu_powerup: * Make given CPU runable. Called with MCPM lock held and IRQs disabled. * The given cluster is assumed to be set up (cluster_powerup would have * been called beforehand). Must return 0 for success or negative error code. * * cluster_powerup: * Set up power for given cluster. Called with MCPM lock held and IRQs * disabled. Called before first cpu_powerup when cluster is down. Must * return 0 for success or negative error code. * * cpu_suspend_prepare: * Special suspend configuration. Called on target CPU with MCPM lock held * and IRQs disabled. This callback is optional. If provided, it is called * before cpu_powerdown_prepare. * * cpu_powerdown_prepare: * Configure given CPU for power down. Called on target CPU with MCPM lock * held and IRQs disabled. Power down must be effective only at the next WFI instruction. * * cluster_powerdown_prepare: * Configure given cluster for power down. Called on one CPU from target * cluster with MCPM lock held and IRQs disabled. A cpu_powerdown_prepare * for each CPU in the cluster has happened when this occurs. * * cpu_cache_disable: * Clean and disable CPU level cache for the calling CPU. Called on with IRQs * disabled only. The CPU is no longer cache coherent with the rest of the * system when this returns. * * cluster_cache_disable: * Clean and disable the cluster wide cache as well as the CPU level cache * for the calling CPU. No call to cpu_cache_disable will happen for this * CPU. Called with IRQs disabled and only when all the other CPUs are done * with their own cpu_cache_disable. The cluster is no longer cache coherent * with the rest of the system when this returns. * * cpu_is_up: * Called on given CPU after it has been powered up or resumed. The MCPM lock * is held and IRQs disabled. This callback is optional. * * cluster_is_up: * Called by the first CPU to be powered up or resumed in given cluster. * The MCPM lock is held and IRQs disabled. This callback is optional. If * provided, it is called before cpu_is_up for that CPU. * * wait_for_powerdown: * Wait until given CPU is powered down. This is called in sleeping context. * Some reasonable timeout must be considered. Must return 0 for success or * negative error code. */ struct mcpm_platform_ops { int (*cpu_powerup)(unsigned int cpu, unsigned int cluster); int (*cluster_powerup)(unsigned int cluster); void (*cpu_suspend_prepare)(unsigned int cpu, unsigned int cluster); void (*cpu_powerdown_prepare)(unsigned int cpu, unsigned int cluster); void (*cluster_powerdown_prepare)(unsigned int cluster); void (*cpu_cache_disable)(void); void (*cluster_cache_disable)(void); void (*cpu_is_up)(unsigned int cpu, unsigned int cluster); void (*cluster_is_up)(unsigned int cluster); int (*wait_for_powerdown)(unsigned int cpu, unsigned int cluster); }; /** * mcpm_platform_register - register platform specific power methods * * @ops: mcpm_platform_ops structure to register * * An error is returned if the registration has been done previously. */ int __init mcpm_platform_register(const struct mcpm_platform_ops *ops); /** * mcpm_sync_init - Initialize the cluster synchronization support * * @power_up_setup: platform specific function invoked during very * early CPU/cluster bringup stage. * * This prepares memory used by vlocks and the MCPM state machine used * across CPUs that may have their caches active or inactive. Must be * called only after a successful call to mcpm_platform_register(). * * The power_up_setup argument is a pointer to assembly code called when * the MMU and caches are still disabled during boot and no stack space is * available. The affinity level passed to that code corresponds to the * resource that needs to be initialized (e.g. 1 for cluster level, 0 for * CPU level). Proper exclusion mechanisms are already activated at that * point. */ int __init mcpm_sync_init( void (*power_up_setup)(unsigned int affinity_level)); /** * mcpm_loopback - make a run through the MCPM low-level code * * @cache_disable: pointer to function performing cache disabling * * This exercises the MCPM machinery by soft resetting the CPU and branching * to the MCPM low-level entry code before returning to the caller. * The @cache_disable function must do the necessary cache disabling to * let the regular kernel init code turn it back on as if the CPU was * hotplugged in. The MCPM state machine is set as if the cluster was * initialized meaning the power_up_setup callback passed to mcpm_sync_init() * will be invoked for all affinity levels. This may be useful to initialize * some resources such as enabling the CCI that requires the cache to be off, or simply for testing purposes. */ int __init mcpm_loopback(void (*cache_disable)(void)); void __init mcpm_smp_set_ops(void); /* * Synchronisation structures for coordinating safe cluster setup/teardown. * This is private to the MCPM core code and shared between C and assembly. * When modifying this structure, make sure you update the MCPM_SYNC_ defines * to match. */ struct mcpm_sync_struct { /* individual CPU states */ struct { s8 cpu __aligned(__CACHE_WRITEBACK_GRANULE); } cpus[MAX_CPUS_PER_CLUSTER]; /* cluster state */ s8 cluster __aligned(__CACHE_WRITEBACK_GRANULE); /* inbound-side state */ s8 inbound __aligned(__CACHE_WRITEBACK_GRANULE); }; struct sync_struct { struct mcpm_sync_struct clusters[MAX_NR_CLUSTERS]; }; #else /* * asm-offsets.h causes trouble when included in .c files, and cacheflush.h * cannot be included in asm files. Let's work around the conflict like this. */ #include <asm/asm-offsets.h> #define __CACHE_WRITEBACK_GRANULE CACHE_WRITEBACK_GRANULE #endif /* ! __ASSEMBLY__ */ /* Definitions for mcpm_sync_struct */ #define CPU_DOWN 0x11 #define CPU_COMING_UP 0x12 #define CPU_UP 0x13 #define CPU_GOING_DOWN 0x14 #define CLUSTER_DOWN 0x21 #define CLUSTER_UP 0x22 #define CLUSTER_GOING_DOWN 0x23 #define INBOUND_NOT_COMING_UP 0x31 #define INBOUND_COMING_UP 0x32 /* * Offsets for the mcpm_sync_struct members, for use in asm. * We don't want to make them global to the kernel via asm-offsets.c. */ #define MCPM_SYNC_CLUSTER_CPUS 0 #define MCPM_SYNC_CPU_SIZE __CACHE_WRITEBACK_GRANULE #define MCPM_SYNC_CLUSTER_CLUSTER \ (MCPM_SYNC_CLUSTER_CPUS + MCPM_SYNC_CPU_SIZE * MAX_CPUS_PER_CLUSTER) #define MCPM_SYNC_CLUSTER_INBOUND \ (MCPM_SYNC_CLUSTER_CLUSTER + __CACHE_WRITEBACK_GRANULE) #define MCPM_SYNC_CLUSTER_SIZE \ (MCPM_SYNC_CLUSTER_INBOUND + __CACHE_WRITEBACK_GRANULE) #endif
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
hardware | Folder | 0755 |
|
|
mach | Folder | 0755 |
|
|
xen | Folder | 0755 |
|
|
Kbuild | File | 568 B | 0644 |
|
arch_gicv3.h | File | 9.05 KB | 0644 |
|
arch_timer.h | File | 2.48 KB | 0644 |
|
arm-cci.h | File | 1.05 KB | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
assembler.h | File | 10.46 KB | 0644 |
|
atomic.h | File | 13.22 KB | 0644 |
|
auxvec.h | File | 29 B | 0644 |
|
bL_switcher.h | File | 2.28 KB | 0644 |
|
barrier.h | File | 2.84 KB | 0644 |
|
bitops.h | File | 8.62 KB | 0644 |
|
bitrev.h | File | 451 B | 0644 |
|
bug.h | File | 2.46 KB | 0644 |
|
bugs.h | File | 546 B | 0644 |
|
cache.h | File | 813 B | 0644 |
|
cacheflush.h | File | 15.54 KB | 0644 |
|
cachetype.h | File | 2.71 KB | 0644 |
|
checksum.h | File | 3.71 KB | 0644 |
|
clocksource.h | File | 153 B | 0644 |
|
cmpxchg.h | File | 6.14 KB | 0644 |
|
compiler.h | File | 978 B | 0644 |
|
cp15.h | File | 3.84 KB | 0644 |
|
cpu.h | File | 533 B | 0644 |
|
cpufeature.h | File | 1.4 KB | 0644 |
|
cpuidle.h | File | 1.33 KB | 0644 |
|
cputype.h | File | 8.42 KB | 0644 |
|
cti.h | File | 3.62 KB | 0644 |
|
dcc.h | File | 1.01 KB | 0644 |
|
delay.h | File | 2.83 KB | 0644 |
|
device.h | File | 771 B | 0644 |
|
div64.h | File | 3.17 KB | 0644 |
|
dma-contiguous.h | File | 265 B | 0644 |
|
dma-iommu.h | File | 1.01 KB | 0644 |
|
dma-mapping.h | File | 7.44 KB | 0644 |
|
dma.h | File | 4.18 KB | 0644 |
|
dmi.h | File | 528 B | 0644 |
|
domain.h | File | 3.65 KB | 0644 |
|
ecard.h | File | 5.98 KB | 0644 |
|
edac.h | File | 1.51 KB | 0644 |
|
efi.h | File | 3.04 KB | 0644 |
|
elf.h | File | 4.52 KB | 0644 |
|
entry-macro-multi.S | File | 726 B | 0644 |
|
exception.h | File | 571 B | 0644 |
|
fb.h | File | 375 B | 0644 |
|
fiq.h | File | 1.36 KB | 0644 |
|
firmware.h | File | 1.82 KB | 0644 |
|
fixmap.h | File | 1.84 KB | 0644 |
|
flat.h | File | 915 B | 0644 |
|
floppy.h | File | 3.61 KB | 0644 |
|
fncpy.h | File | 3.08 KB | 0644 |
|
fpstate.h | File | 1.73 KB | 0644 |
|
ftrace.h | File | 1.92 KB | 0644 |
|
futex.h | File | 4.24 KB | 0644 |
|
glue-cache.h | File | 3.51 KB | 0644 |
|
glue-df.h | File | 2.2 KB | 0644 |
|
glue-pf.h | File | 1.12 KB | 0644 |
|
glue-proc.h | File | 4.46 KB | 0644 |
|
glue.h | File | 759 B | 0644 |
|
gpio.h | File | 693 B | 0644 |
|
hardirq.h | File | 803 B | 0644 |
|
highmem.h | File | 2.15 KB | 0644 |
|
hugetlb-3level.h | File | 2.03 KB | 0644 |
|
hugetlb.h | File | 1.78 KB | 0644 |
|
hw_breakpoint.h | File | 3.53 KB | 0644 |
|
hw_irq.h | File | 349 B | 0644 |
|
hwcap.h | File | 378 B | 0644 |
|
hypervisor.h | File | 140 B | 0644 |
|
ide.h | File | 566 B | 0644 |
|
idmap.h | File | 355 B | 0644 |
|
insn.h | File | 636 B | 0644 |
|
io.h | File | 15.96 KB | 0644 |
|
irq.h | File | 1015 B | 0644 |
|
irq_work.h | File | 234 B | 0644 |
|
irqflags.h | File | 3.88 KB | 0644 |
|
jump_label.h | File | 1009 B | 0644 |
|
kexec-internal.h | File | 272 B | 0644 |
|
kexec.h | File | 2.3 KB | 0644 |
|
kgdb.h | File | 2.72 KB | 0644 |
|
kmap_types.h | File | 190 B | 0644 |
|
kprobes.h | File | 2.65 KB | 0644 |
|
kvm_arm.h | File | 7.6 KB | 0644 |
|
kvm_asm.h | File | 2.84 KB | 0644 |
|
kvm_coproc.h | File | 1.99 KB | 0644 |
|
kvm_emulate.h | File | 7.84 KB | 0644 |
|
kvm_host.h | File | 10.31 KB | 0644 |
|
kvm_hyp.h | File | 4.49 KB | 0644 |
|
kvm_mmio.h | File | 1.34 KB | 0644 |
|
kvm_mmu.h | File | 7.27 KB | 0644 |
|
limits.h | File | 166 B | 0644 |
|
linkage.h | File | 216 B | 0644 |
|
mc146818rtc.h | File | 720 B | 0644 |
|
mcpm.h | File | 11.92 KB | 0644 |
|
mcs_spinlock.h | File | 570 B | 0644 |
|
memblock.h | File | 248 B | 0644 |
|
memory.h | File | 10.12 KB | 0644 |
|
mmu.h | File | 953 B | 0644 |
|
mmu_context.h | File | 3.94 KB | 0644 |
|
module.h | File | 1.57 KB | 0644 |
|
mpu.h | File | 2.15 KB | 0644 |
|
mtd-xip.h | File | 666 B | 0644 |
|
neon.h | File | 1.16 KB | 0644 |
|
nwflash.h | File | 252 B | 0644 |
|
opcodes-sec.h | File | 742 B | 0644 |
|
opcodes-virt.h | File | 1.32 KB | 0644 |
|
opcodes.h | File | 8.07 KB | 0644 |
|
outercache.h | File | 3.78 KB | 0644 |
|
page-nommu.h | File | 957 B | 0644 |
|
page.h | File | 3.61 KB | 0644 |
|
paravirt.h | File | 454 B | 0644 |
|
patch.h | File | 438 B | 0644 |
|
pci.h | File | 956 B | 0644 |
|
percpu.h | File | 1.56 KB | 0644 |
|
perf_event.h | File | 850 B | 0644 |
|
pgalloc.h | File | 3.79 KB | 0644 |
|
pgtable-2level-hwdef.h | File | 3.45 KB | 0644 |
|
pgtable-2level-types.h | File | 1.84 KB | 0644 |
|
pgtable-2level.h | File | 8.51 KB | 0644 |
|
pgtable-3level-hwdef.h | File | 3.95 KB | 0644 |
|
pgtable-3level-types.h | File | 1.89 KB | 0644 |
|
pgtable-3level.h | File | 9.54 KB | 0644 |
|
pgtable-hwdef.h | File | 467 B | 0644 |
|
pgtable-nommu.h | File | 2.66 KB | 0644 |
|
pgtable.h | File | 11.68 KB | 0644 |
|
probes.h | File | 1.73 KB | 0644 |
|
proc-fns.h | File | 4.79 KB | 0644 |
|
processor.h | File | 3.4 KB | 0644 |
|
procinfo.h | File | 1.27 KB | 0644 |
|
prom.h | File | 715 B | 0644 |
|
psci.h | File | 771 B | 0644 |
|
ptrace.h | File | 4.89 KB | 0644 |
|
sections.h | File | 189 B | 0644 |
|
set_memory.h | File | 1.04 KB | 0644 |
|
setup.h | File | 934 B | 0644 |
|
shmparam.h | File | 419 B | 0644 |
|
signal.h | File | 500 B | 0644 |
|
smp.h | File | 3.1 KB | 0644 |
|
smp_plat.h | File | 2.48 KB | 0644 |
|
smp_scu.h | File | 1.32 KB | 0644 |
|
smp_twd.h | File | 908 B | 0644 |
|
sparsemem.h | File | 716 B | 0644 |
|
spectre.h | File | 906 B | 0644 |
|
spinlock.h | File | 5.49 KB | 0644 |
|
spinlock_types.h | File | 541 B | 0644 |
|
stackprotector.h | File | 1.09 KB | 0644 |
|
stacktrace.h | File | 742 B | 0644 |
|
stage2_pgtable.h | File | 2.12 KB | 0644 |
|
string.h | File | 1.43 KB | 0644 |
|
suspend.h | File | 369 B | 0644 |
|
swab.h | File | 1005 B | 0644 |
|
switch_to.h | File | 1.03 KB | 0644 |
|
sync_bitops.h | File | 1.03 KB | 0644 |
|
syscall.h | File | 2.48 KB | 0644 |
|
system_info.h | File | 763 B | 0644 |
|
system_misc.h | File | 1.14 KB | 0644 |
|
tcm.h | File | 937 B | 0644 |
|
therm.h | File | 655 B | 0644 |
|
thread_info.h | File | 5.2 KB | 0644 |
|
thread_notify.h | File | 1.2 KB | 0644 |
|
timex.h | File | 577 B | 0644 |
|
tlb.h | File | 7.37 KB | 0644 |
|
tlbflush.h | File | 17.88 KB | 0644 |
|
tls.h | File | 3.09 KB | 0644 |
|
topology.h | File | 1.18 KB | 0644 |
|
traps.h | File | 1.17 KB | 0644 |
|
trusted_foundations.h | File | 2.29 KB | 0644 |
|
uaccess-asm.h | File | 2.83 KB | 0644 |
|
uaccess.h | File | 16.22 KB | 0644 |
|
ucontext.h | File | 2.98 KB | 0644 |
|
unaligned.h | File | 846 B | 0644 |
|
unified.h | File | 1.61 KB | 0644 |
|
unistd.h | File | 1.68 KB | 0644 |
|
unwind.h | File | 1.71 KB | 0644 |
|
uprobes.h | File | 1.07 KB | 0644 |
|
user.h | File | 4.2 KB | 0644 |
|
v7m.h | File | 2.93 KB | 0644 |
|
vdso.h | File | 507 B | 0644 |
|
vdso_datapage.h | File | 1.69 KB | 0644 |
|
vfp.h | File | 2.86 KB | 0644 |
|
vfpmacros.h | File | 2.1 KB | 0644 |
|
vga.h | File | 305 B | 0644 |
|
virt.h | File | 2.9 KB | 0644 |
|
word-at-a-time.h | File | 2.08 KB | 0644 |
|
xor.h | File | 5.22 KB | 0644 |
|