Commit 1bf4af16 authored by Anton Blanchard's avatar Anton Blanchard Committed by Paul Mackerras

powerpc: tracing: Add powerpc tracepoints for interrupt entry and exit

This adds powerpc-specific tracepoints for interrupt entry and exit.

While we already have generic irq_handler_entry and irq_handler_exit
tracepoints there are cases on our virtualised powerpc machines where an
interrupt is presented to the OS, but subsequently handled by the hypervisor.
This means no OS interrupt handler is invoked.

Here is an example on a POWER6 machine with the patch below applied:

<idle>-0     [006]  3243.949840744: irq_entry: pt_regs=c0000000ce31fb10
<idle>-0     [006]  3243.949850520: irq_exit: pt_regs=c0000000ce31fb10

<idle>-0     [007]  3243.950218208: irq_entry: pt_regs=c0000000ce323b10
<idle>-0     [007]  3243.950224080: irq_exit: pt_regs=c0000000ce323b10

<idle>-0     [000]  3244.021879320: irq_entry: pt_regs=c000000000a63aa0
<idle>-0     [000]  3244.021883616: irq_handler_entry: irq=87 handler=eth0
<idle>-0     [000]  3244.021887328: irq_handler_exit: irq=87 return=handled
<idle>-0     [000]  3244.021897408: irq_exit: pt_regs=c000000000a63aa0

Here we see two phantom interrupts (no handler was invoked), followed
by a real interrupt for eth0. Without the tracepoints in this patch we
would have missed the phantom interrupts.
Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 196f02bf
#undef TRACE_SYSTEM
#define TRACE_SYSTEM powerpc
#if !defined(_TRACE_POWERPC_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_POWERPC_H
#include <linux/tracepoint.h>
struct pt_regs;
TRACE_EVENT(irq_entry,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs),
TP_STRUCT__entry(
__field(struct pt_regs *, regs)
),
TP_fast_assign(
__entry->regs = regs;
),
TP_printk("pt_regs=%p", __entry->regs)
);
TRACE_EVENT(irq_exit,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs),
TP_STRUCT__entry(
__field(struct pt_regs *, regs)
),
TP_fast_assign(
__entry->regs = regs;
),
TP_printk("pt_regs=%p", __entry->regs)
);
#endif /* _TRACE_POWERPC_H */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH asm
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>
...@@ -70,6 +70,8 @@ ...@@ -70,6 +70,8 @@
#include <asm/firmware.h> #include <asm/firmware.h>
#include <asm/lv1call.h> #include <asm/lv1call.h>
#endif #endif
#define CREATE_TRACE_POINTS
#include <asm/trace.h>
int __irq_offset_value; int __irq_offset_value;
static int ppc_spurious_interrupts; static int ppc_spurious_interrupts;
...@@ -325,6 +327,8 @@ void do_IRQ(struct pt_regs *regs) ...@@ -325,6 +327,8 @@ void do_IRQ(struct pt_regs *regs)
struct pt_regs *old_regs = set_irq_regs(regs); struct pt_regs *old_regs = set_irq_regs(regs);
unsigned int irq; unsigned int irq;
trace_irq_entry(regs);
irq_enter(); irq_enter();
check_stack_overflow(); check_stack_overflow();
...@@ -348,6 +352,8 @@ void do_IRQ(struct pt_regs *regs) ...@@ -348,6 +352,8 @@ void do_IRQ(struct pt_regs *regs)
timer_interrupt(regs); timer_interrupt(regs);
} }
#endif #endif
trace_irq_exit(regs);
} }
void __init init_IRQ(void) void __init init_IRQ(void)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment