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ARM64: add IPI tracepoints

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The strings used to list IPIs in /proc/interrupts are reused for tracing
purposes.

While at it, the code is slightly cleaned up so the ipi_types array
indices are no longer offset by IPI_RESCHEDULE whose value is 0 anyway.

Link: http://lkml.kernel.org/p/1406318733-26754-5-git-send-email-nicolas.pitre@linaro.org

Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Nicolas Pitre 2014-07-25 16:05:32 -04:00 committed by Steven Rostedt
parent 365ec7b173
commit 45ed695ac1
1 changed files with 39 additions and 26 deletions
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65
arch/arm64/kernel/smp.c
View File

@ -50,6 +50,9 @@
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
#define CREATE_TRACE_POINTS
#include <trace/events/ipi.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
* so we need some other way of telling a new secondary core
@ -307,8 +310,6 @@ void __init smp_prepare_boot_cpu(void)
set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
}
static void (*smp_cross_call)(const struct cpumask *, unsigned int);
/*
* Enumerate the possible CPU set from the device tree and build the
* cpu logical map array containing MPIDR values related to logical
@ -463,32 +464,15 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
}
}
static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
{
smp_cross_call = fn;
__smp_cross_call = fn;
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
if (smp_cross_call)
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
static const char *ipi_types[NR_IPI] = {
#define S(x,s) [x - IPI_RESCHEDULE] = s
static const char *ipi_types[NR_IPI] __tracepoint_string = {
#define S(x,s) [x] = s
S(IPI_RESCHEDULE, "Rescheduling interrupts"),
S(IPI_CALL_FUNC, "Function call interrupts"),
S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
@ -497,12 +481,18 @@ static const char *ipi_types[NR_IPI] = {
S(IPI_IRQ_WORK, "IRQ work interrupts"),
};
static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
{
trace_ipi_raise(target, ipi_types[ipinr]);
__smp_cross_call(target, ipinr);
}
void show_ipi_list(struct seq_file *p, int prec)
{
unsigned int cpu, i;
for (i = 0; i < NR_IPI; i++) {
seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i + IPI_RESCHEDULE,
seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
prec >= 4 ? " " : "");
for_each_online_cpu(cpu)
seq_printf(p, "%10u ",
@ -522,6 +512,24 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
return sum;
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
}
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
if (__smp_cross_call)
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
}
#endif
static DEFINE_RAW_SPINLOCK(stop_lock);
/*
@ -553,8 +561,10 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
unsigned int cpu = smp_processor_id();
struct pt_regs *old_regs = set_irq_regs(regs);
if (ipinr >= IPI_RESCHEDULE && ipinr < IPI_RESCHEDULE + NR_IPI)
__inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_RESCHEDULE]);
if ((unsigned)ipinr < NR_IPI) {
trace_ipi_entry(ipi_types[ipinr]);
__inc_irq_stat(cpu, ipi_irqs[ipinr]);
}
switch (ipinr) {
case IPI_RESCHEDULE:
@ -599,6 +609,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);
break;
}
if ((unsigned)ipinr < NR_IPI)
trace_ipi_exit(ipi_types[ipinr]);
set_irq_regs(old_regs);
}