Commit 9a5ad7d0 authored by Jungseok Lee's avatar Jungseok Lee Committed by Will Deacon

arm64: Add __exception_irq_entry definition for function graph

The gic_handle_irq() is defined with __exception_irq_entry attribute.
A single remaining work is to add its definition as ARM did. Below
shows how function graph data is changed with these hunks.

A prologue of an interrupt handler is drawn as follows.

- current status

 0)   0.208 us    |  cpuidle_not_available();
 0)               |  default_idle_call() {
 0)               |    arch_cpu_idle() {
 0)               |      __handle_domain_irq() {
 0)               |        irq_enter() {
 0)   0.313 us    |          rcu_irq_enter();
 0)   0.261 us    |          __local_bh_disable_ip();

- with this change

 0)   0.625 us    |  cpuidle_not_available();
 0)               |  default_idle_call() {
 0)               |    arch_cpu_idle() {
 0)   ==========> |
 0)               |      gic_handle_irq() {
 0)               |        __handle_domain_irq() {
 0)               |          irq_enter() {
 0)   0.885 us    |            rcu_irq_enter();
 0)   0.781 us    |            __local_bh_disable_ip();

An epilogue of an interrupt handler is recorded as follows.

- current status

 0)   0.261 us    |          idle_cpu();
 0)               |          rcu_irq_exit() {
 0)   0.521 us    |            rcu_eqs_enter_common.isra.46();
 0)   2.552 us    |          }
 0) ! 322.448 us  |        }
 0) ! 583.437 us  |      }
 0) # 1656.041 us |    }
 0) # 1658.073 us |  }

- with this change

 0)   0.677 us    |            idle_cpu();
 0)               |            rcu_irq_exit() {
 0)   1.770 us    |              rcu_eqs_enter_common.isra.46();
 0)   7.968 us    |            }
 0) # 1803.541 us |          }
 0) # 2626.667 us |        }
 0) # 2632.969 us |      }
 0)   <========== |
 0) # 14425.00 us |    }
 0) # 14430.98 us |  }

Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rabin Vincent <rabin@rab.in>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarJungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent d422e625
......@@ -18,7 +18,13 @@
#ifndef __ASM_EXCEPTION_H
#define __ASM_EXCEPTION_H
#include <linux/ftrace.h>
#define __exception __attribute__((section(".exception.text")))
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#define __exception_irq_entry __irq_entry
#else
#define __exception_irq_entry __exception
#endif
#endif /* __ASM_EXCEPTION_H */
......@@ -34,13 +34,32 @@ struct undef_hook {
void register_undef_hook(struct undef_hook *hook);
void unregister_undef_hook(struct undef_hook *hook);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static inline int __in_irqentry_text(unsigned long ptr)
{
extern char __irqentry_text_start[];
extern char __irqentry_text_end[];
return ptr >= (unsigned long)&__irqentry_text_start &&
ptr < (unsigned long)&__irqentry_text_end;
}
#else
static inline int __in_irqentry_text(unsigned long ptr)
{
return 0;
}
#endif
static inline int in_exception_text(unsigned long ptr)
{
extern char __exception_text_start[];
extern char __exception_text_end[];
int in;
return ptr >= (unsigned long)&__exception_text_start &&
in = ptr >= (unsigned long)&__exception_text_start &&
ptr < (unsigned long)&__exception_text_end;
return in ? : __in_irqentry_text(ptr);
}
#endif
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