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

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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: Anton Blanchard <anton@samba.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard
2009-10-26 18:47:42 +00:00
committed by Paul Mackerras
parent 196f02bf90
commit 1bf4af1650
2 changed files with 59 additions and 0 deletions
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6
arch/powerpc/kernel/irq.c
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@ -70,6 +70,8 @@
#include <asm/firmware.h>
#include <asm/lv1call.h>
#endif
#define CREATE_TRACE_POINTS
#include <asm/trace.h>
int __irq_offset_value;
static int ppc_spurious_interrupts;
@ -325,6 +327,8 @@ void do_IRQ(struct pt_regs *regs)
struct pt_regs *old_regs = set_irq_regs(regs);
unsigned int irq;
trace_irq_entry(regs);
irq_enter();
check_stack_overflow();
@ -348,6 +352,8 @@ void do_IRQ(struct pt_regs *regs)
timer_interrupt(regs);
}
#endif
trace_irq_exit(regs);
}
void __init init_IRQ(void)