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powerpc: Add doorbell tracepoints 

When analysing sources of OS jitter, I noticed that doorbells cannot be
traced.

Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2018-10-04 16:23:37 +10:00 committed by Michael Ellerman
parent 32eeb5614d
commit 5b2a152962
2 changed files with 19 additions and 0 deletions
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16
arch/powerpc/include/asm/trace.h
View File

@ -54,6 +54,22 @@ DEFINE_EVENT(ppc64_interrupt_class, timer_interrupt_exit,
TP_ARGS(regs)
);
#ifdef CONFIG_PPC_DOORBELL
DEFINE_EVENT(ppc64_interrupt_class, doorbell_entry,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
DEFINE_EVENT(ppc64_interrupt_class, doorbell_exit,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
#endif
#ifdef CONFIG_PPC_PSERIES
extern int hcall_tracepoint_regfunc(void);
extern void hcall_tracepoint_unregfunc(void);

3
arch/powerpc/kernel/dbell.c
View File

@ -18,6 +18,7 @@
#include <asm/dbell.h>
#include <asm/irq_regs.h>
#include <asm/kvm_ppc.h>
#include <asm/trace.h>
#ifdef CONFIG_SMP
@ -81,6 +82,7 @@ void doorbell_exception(struct pt_regs *regs)
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
trace_doorbell_entry(regs);
ppc_msgsync();
@ -91,6 +93,7 @@ void doorbell_exception(struct pt_regs *regs)
smp_ipi_demux_relaxed(); /* already performed the barrier */
trace_doorbell_exit(regs);
irq_exit();
set_irq_regs(old_regs);
}