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/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H

/* Values for secondary_data.status */

#define CPU_MMU_OFF		(-1)
#define CPU_BOOT_SUCCESS	(0)
/* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
#define CPU_KILL_ME		(1)
/* The cpu couldn't die gracefully and is looping in the kernel */
#define CPU_STUCK_IN_KERNEL	(2)
/* Fatal system error detected by secondary CPU, crash the system */
#define CPU_PANIC_KERNEL	(3)

#ifndef __ASSEMBLY__

#include <asm/percpu.h>

#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/thread_info.h>

DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);

/*
 * We don't use this_cpu_read(cpu_number) as that has implicit writes to
 * preempt_count, and associated (compiler) barriers, that we'd like to avoid
 * the expense of. If we're preemptible, the value can be stale at use anyway.
 * And we can't use this_cpu_ptr() either, as that winds up recursing back
 * here under CONFIG_DEBUG_PREEMPT=y.
 */
#define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))

struct seq_file;

/*
 * generate IPI list text
 */
extern void show_ipi_list(struct seq_file *p, int prec);

/*
 * Called from C code, this handles an IPI.
 */
extern void handle_IPI(int ipinr, struct pt_regs *regs);

/*
 * Discover the set of possible CPUs and determine their
 * SMP operations.
 */
extern void smp_init_cpus(void);

/*
 * Provide a function to raise an IPI cross call on CPUs in callmap.
 */
extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));

extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);

/*
 * Called from the secondary holding pen, this is the secondary CPU entry point.
 */
asmlinkage void secondary_start_kernel(void);

/*
 * Initial data for bringing up a secondary CPU.
 * @stack  - sp for the secondary CPU
 * @status - Result passed back from the secondary CPU to
 *           indicate failure.
 */
struct secondary_data {
	void *stack;
	struct task_struct *task;
	long status;
};

extern struct secondary_data secondary_data;
extern long __early_cpu_boot_status;
extern void secondary_entry(void);

extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);

#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
#else
static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
	BUILD_BUG();
}
#endif

extern int __cpu_disable(void);

extern void __cpu_die(unsigned int cpu);
extern void cpu_die(void);
extern void cpu_die_early(void);

static inline void cpu_park_loop(void)
{
	for (;;) {
		wfe();
		wfi();
	}
}

static inline void update_cpu_boot_status(int val)
{
	WRITE_ONCE(secondary_data.status, val);
	/* Ensure the visibility of the status update */
	dsb(ishst);
}

/*
 * The calling secondary CPU has detected serious configuration mismatch,
 * which calls for a kernel panic. Update the boot status and park the calling
 * CPU.
 */
static inline void cpu_panic_kernel(void)
{
	update_cpu_boot_status(CPU_PANIC_KERNEL);
	cpu_park_loop();
}

/*
 * If a secondary CPU enters the kernel but fails to come online,
 * (e.g. due to mismatched features), and cannot exit the kernel,
 * we increment cpus_stuck_in_kernel and leave the CPU in a
 * quiesecent loop within the kernel text. The memory containing
 * this loop must not be re-used for anything else as the 'stuck'
 * core is executing it.
 *
 * This function is used to inhibit features like kexec and hibernate.
 */
bool cpus_are_stuck_in_kernel(void);

extern void crash_smp_send_stop(void);
extern bool smp_crash_stop_failed(void);

#endif /* ifndef __ASSEMBLY__ */

#endif /* ifndef __ASM_SMP_H */

Filemanager

Name Type Size Permission Actions
xen Folder 0755
Kbuild File 703 B 0644
acenv.h File 541 B 0644
acpi.h File 4.34 KB 0644
alternative.h File 7.63 KB 0644
arch_gicv3.h File 3.44 KB 0644
arch_timer.h File 4.87 KB 0644
arm-cci.h File 794 B 0644
asm-bug.h File 1.45 KB 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 2.09 KB 0644
assembler.h File 13.51 KB 0644
atomic.h File 8.35 KB 0644
atomic_ll_sc.h File 10.62 KB 0644
atomic_lse.h File 14.82 KB 0644
barrier.h File 3.78 KB 0644
bitops.h File 1.9 KB 0644
bitrev.h File 452 B 0644
boot.h File 384 B 0644
brk-imm.h File 706 B 0644
bug.h File 1.09 KB 0644
cache.h File 2.23 KB 0644
cacheflush.h File 4.87 KB 0644
checksum.h File 1.35 KB 0644
clocksource.h File 192 B 0644
cmpxchg.h File 7.98 KB 0644
compat.h File 7.15 KB 0644
compiler.h File 1.18 KB 0644
cpu.h File 1.84 KB 0644
cpu_ops.h File 2.73 KB 0644
cpucaps.h File 1.83 KB 0644
cpufeature.h File 19.14 KB 0644
cpuidle.h File 401 B 0644
cputype.h File 8.1 KB 0644
current.h File 517 B 0644
daifflags.h File 1.59 KB 0644
dcc.h File 1.36 KB 0644
debug-monitors.h File 3.76 KB 0644
device.h File 886 B 0644
dma-mapping.h File 2.42 KB 0644
dmi.h File 850 B 0644
efi.h File 4.57 KB 0644
elf.h File 5.7 KB 0644
esr.h File 9.02 KB 0644
exception.h File 1.21 KB 0644
exec.h File 868 B 0644
extable.h File 815 B 0644
fb.h File 1000 B 0644
fixmap.h File 2.91 KB 0644
fpsimd.h File 4.21 KB 0644
fpsimdmacros.h File 5.62 KB 0644
ftrace.h File 1.92 KB 0644
futex.h File 3.41 KB 0644
hardirq.h File 2.08 KB 0644
hugetlb.h File 2.71 KB 0644
hw_breakpoint.h File 4.46 KB 0644
hwcap.h File 1.86 KB 0644
hypervisor.h File 144 B 0644
insn.h File 16.03 KB 0644
io.h File 7.72 KB 0644
irq.h File 307 B 0644
irq_work.h File 228 B 0644
irqflags.h File 2.3 KB 0644
jump_label.h File 1.68 KB 0644
kasan.h File 1.16 KB 0644
kernel-pgtable.h File 4.03 KB 0644
kexec.h File 2.42 KB 0644
kgdb.h File 3.79 KB 0644
kprobes.h File 1.74 KB 0644
kvm_arm.h File 8.38 KB 0644
kvm_asm.h File 4.26 KB 0644
kvm_coproc.h File 2.04 KB 0644
kvm_emulate.h File 10.38 KB 0644
kvm_host.h File 15.73 KB 0644
kvm_hyp.h File 5.79 KB 0644
kvm_mmio.h File 1.3 KB 0644
kvm_mmu.h File 11.72 KB 0644
linkage.h File 114 B 0644
lse.h File 1.26 KB 0644
memblock.h File 720 B 0644
memory.h File 9.32 KB 0644
mmu.h File 2.74 KB 0644
mmu_context.h File 6.35 KB 0644
mmzone.h File 266 B 0644
module.h File 2.8 KB 0644
neon.h File 815 B 0644
numa.h File 1.33 KB 0644
page-def.h File 1.17 KB 0644
page.h File 1.61 KB 0644
paravirt.h File 458 B 0644
pci.h File 878 B 0644
percpu.h File 7.48 KB 0644
perf_event.h File 3.17 KB 0644
pgalloc.h File 3.71 KB 0644
pgtable-hwdef.h File 9.4 KB 0644
pgtable-prot.h File 4.38 KB 0644
pgtable-types.h File 1.84 KB 0644
pgtable.h File 21.55 KB 0644
probes.h File 1022 B 0644
proc-fns.h File 1.21 KB 0644
processor.h File 6.52 KB 0644
ptdump.h File 1.42 KB 0644
ptrace.h File 9 KB 0644
sdei.h File 1.46 KB 0644
seccomp.h File 714 B 0644
sections.h File 1.46 KB 0644
shmparam.h File 965 B 0644
signal32.h File 1.45 KB 0644
simd.h File 1.39 KB 0644
smp.h File 4.23 KB 0644
smp_plat.h File 1.43 KB 0644
sparsemem.h File 771 B 0644
spinlock.h File 3.33 KB 0644
spinlock_types.h File 1.06 KB 0644
stack_pointer.h File 247 B 0644
stackprotector.h File 1.11 KB 0644
stacktrace.h File 2.53 KB 0644
stage2_pgtable-nopmd.h File 1.3 KB 0644
stage2_pgtable-nopud.h File 1.24 KB 0644
stage2_pgtable.h File 4.89 KB 0644
stat.h File 1.43 KB 0644
string.h File 2.33 KB 0644
suspend.h File 1.65 KB 0644
sync_bitops.h File 1.11 KB 0644
syscall.h File 2.87 KB 0644
sysreg.h File 25.1 KB 0644
system_misc.h File 1.86 KB 0644
thread_info.h File 3.93 KB 0644
timex.h File 883 B 0644
tlb.h File 2.22 KB 0644
tlbflush.h File 5.38 KB 0644
topology.h File 1.29 KB 0644
traps.h File 3.33 KB 0644
uaccess.h File 12.01 KB 0644
unistd.h File 1.6 KB 0644
unistd32.h File 27.53 KB 0644
uprobes.h File 777 B 0644
vdso.h File 1.09 KB 0644
vdso_datapage.h File 1.53 KB 0644
vectors.h File 1.75 KB 0644
virt.h File 3 KB 0644
vmap_stack.h File 769 B 0644
word-at-a-time.h File 2.22 KB 0644