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MIPS: Tracing: Add IRQENTRY_EXIT section for MIPS

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This patch add a new section for MIPS to record the block of the hardirq
handling for function graph tracer(print_graph_irq) via adding the
__irq_entry annotation to the the entrypoints of the hardirqs(the block
with irq_enter()...irq_exit()).

Thanks goes to Steven & Frederic Weisbecker for their feedbacks.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: zhangfx@lemote.com
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/676/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin
2009-11-20 20:34:33 +08:00
committed by Ralf Baechle
parent 538f19526e
commit 8f99a16265
7 changed files with 53 additions and 37 deletions
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21
arch/mips/kernel/smtc.c
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@@ -25,6 +25,7 @@
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/ftrace.h>
#include <asm/cpu.h>
#include <asm/processor.h>
@@ -939,23 +940,29 @@ static void ipi_call_interrupt(void)
DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device);
void ipi_decode(struct smtc_ipi *pipi)
static void __irq_entry smtc_clock_tick_interrupt(void)
{
unsigned int cpu = smp_processor_id();
struct clock_event_device *cd;
int irq = MIPS_CPU_IRQ_BASE + 1;
irq_enter();
kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
cd = &per_cpu(mips_clockevent_device, cpu);
cd->event_handler(cd);
irq_exit();
}
void ipi_decode(struct smtc_ipi *pipi)
{
void *arg_copy = pipi->arg;
int type_copy = pipi->type;
int irq = MIPS_CPU_IRQ_BASE + 1;
smtc_ipi_nq(&freeIPIq, pipi);
switch (type_copy) {
case SMTC_CLOCK_TICK:
irq_enter();
kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
cd = &per_cpu(mips_clockevent_device, cpu);
cd->event_handler(cd);
irq_exit();
smtc_clock_tick_interrupt();
break;
case LINUX_SMP_IPI: