* [PATCH] powerpc: Add doorbell tracepoints
@ 2018-10-04 6:23 Anton Blanchard
2019-05-03 6:59 ` Michael Ellerman
0 siblings, 1 reply; 6+ messages in thread
From: Anton Blanchard @ 2018-10-04 6:23 UTC (permalink / raw)
To: benh, paulus, mpe, npiggin, ruscur; +Cc: linuxppc-dev
When analysing sources of OS jitter, I noticed that doorbells cannot be
traced.
Signed-off-by: Anton Blanchard <anton@ozlabs.org>
---
arch/powerpc/include/asm/trace.h | 16 ++++++++++++++++
arch/powerpc/kernel/dbell.c | 3 +++
2 files changed, 19 insertions(+)
diff --git a/arch/powerpc/include/asm/trace.h b/arch/powerpc/include/asm/trace.h
index d018e8602694..2f1f8cd7b6c8 100644
--- a/arch/powerpc/include/asm/trace.h
+++ b/arch/powerpc/include/asm/trace.h
@@ -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);
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
index b6fe883b1016..5ec3b3835925 100644
--- a/arch/powerpc/kernel/dbell.c
+++ b/arch/powerpc/kernel/dbell.c
@@ -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);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] powerpc: Add doorbell tracepoints
@ 2018-10-03 0:29 Anton Blanchard
2018-10-03 3:48 ` Nicholas Piggin
2018-10-04 5:41 ` Russell Currey
0 siblings, 2 replies; 6+ messages in thread
From: Anton Blanchard @ 2018-10-03 0:29 UTC (permalink / raw)
To: benh, paulus, mpe, npiggin; +Cc: linuxppc-dev
When analysing sources of OS jitter, I noticed that doorbells cannot be
traced.
Signed-off-by: Anton Blanchard <anton@ozlabs.org>
---
arch/powerpc/include/asm/trace.h | 16 ++++++++++++++++
arch/powerpc/kernel/dbell.c | 3 +++
2 files changed, 19 insertions(+)
diff --git a/arch/powerpc/include/asm/trace.h b/arch/powerpc/include/asm/trace.h
index d018e8602694..eb9aa0f1561e 100644
--- a/arch/powerpc/include/asm/trace.h
+++ b/arch/powerpc/include/asm/trace.h
@@ -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_exception_entry,
+
+ TP_PROTO(struct pt_regs *regs),
+
+ TP_ARGS(regs)
+);
+
+DEFINE_EVENT(ppc64_interrupt_class, doorbell_exception_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);
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
index b6fe883b1016..5ec3b3835925 100644
--- a/arch/powerpc/kernel/dbell.c
+++ b/arch/powerpc/kernel/dbell.c
@@ -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);
}
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] powerpc: Add doorbell tracepoints
2018-10-03 0:29 Anton Blanchard
@ 2018-10-03 3:48 ` Nicholas Piggin
2018-10-04 5:41 ` Russell Currey
1 sibling, 0 replies; 6+ messages in thread
From: Nicholas Piggin @ 2018-10-03 3:48 UTC (permalink / raw)
To: Anton Blanchard; +Cc: paulus, linuxppc-dev
On Wed, 3 Oct 2018 10:29:57 +1000
Anton Blanchard <anton@ozlabs.org> wrote:
> When analysing sources of OS jitter, I noticed that doorbells cannot be
> traced.
>
> Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
> ---
> arch/powerpc/include/asm/trace.h | 16 ++++++++++++++++
> arch/powerpc/kernel/dbell.c | 3 +++
> 2 files changed, 19 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/trace.h b/arch/powerpc/include/asm/trace.h
> index d018e8602694..eb9aa0f1561e 100644
> --- a/arch/powerpc/include/asm/trace.h
> +++ b/arch/powerpc/include/asm/trace.h
> @@ -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_exception_entry,
> +
> + TP_PROTO(struct pt_regs *regs),
> +
> + TP_ARGS(regs)
> +);
> +
> +DEFINE_EVENT(ppc64_interrupt_class, doorbell_exception_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);
> diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
> index b6fe883b1016..5ec3b3835925 100644
> --- a/arch/powerpc/kernel/dbell.c
> +++ b/arch/powerpc/kernel/dbell.c
> @@ -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);
> }
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] powerpc: Add doorbell tracepoints
2018-10-03 0:29 Anton Blanchard
2018-10-03 3:48 ` Nicholas Piggin
@ 2018-10-04 5:41 ` Russell Currey
2018-10-04 6:16 ` Anton Blanchard
1 sibling, 1 reply; 6+ messages in thread
From: Russell Currey @ 2018-10-04 5:41 UTC (permalink / raw)
To: Anton Blanchard, benh, paulus, mpe, npiggin; +Cc: linuxppc-dev
On Wed, 2018-10-03 at 10:29 +1000, Anton Blanchard wrote:
> When analysing sources of OS jitter, I noticed that doorbells cannot be
> traced.
>
> Signed-off-by: Anton Blanchard <anton@ozlabs.org>
Hi Anton,
snowpatch builds failed for this patch on all 64-bit configurations (ppc64e, ppc64
and ppc64le) with the following:
arch/powerpc/kernel/dbell.c:85:9: error: undefined identifier
'trace_doorbell_entry'
arch/powerpc/kernel/dbell.c:96:9: error: undefined identifier
'trace_doorbell_exit'
./arch/powerpc/include/asm/spinlock.h:171:9: warning: context imbalance in
'key_user_put' - unexpected unlock
arch/powerpc/kernel/dbell.c: In function 'doorbell_exception':
arch/powerpc/kernel/dbell.c:85:2: error: implicit declaration of function
'trace_doorbell_entry'; did you mean 'trace_irq_entry'? [-Werror=implicit-
function-declaration]
trace_doorbell_entry(regs);
^~~~~~~~~~~~~~~~~~~~
trace_irq_entry
arch/powerpc/kernel/dbell.c:96:2: error: implicit declaration of function
'trace_doorbell_exit'; did you mean 'trace_irq_exit'? [-Werror=implicit-function-
declaration]
trace_doorbell_exit(regs);
^~~~~~~~~~~~~~~~~~~
trace_irq_exit
cc1: all warnings being treated as errors
scripts/Makefile.build:305: recipe for target 'arch/powerpc/kernel/dbell.o' failed
make[1]: *** [arch/powerpc/kernel/dbell.o] Error 1
Makefile:1060: recipe for target 'arch/powerpc/kernel' failed
So does something else need to check for CONFIG_PPC_DOORBELL maybe?
You can see the failures here: http://patchwork.ozlabs.org/patch/978088/ - output
in build_new.log (I know it's not pretty in there yet, you can search for "Error
1" to find the build failure)
- Russell
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] powerpc: Add doorbell tracepoints
2018-10-04 5:41 ` Russell Currey
@ 2018-10-04 6:16 ` Anton Blanchard
0 siblings, 0 replies; 6+ messages in thread
From: Anton Blanchard @ 2018-10-04 6:16 UTC (permalink / raw)
To: Russell Currey; +Cc: paulus, linuxppc-dev, npiggin
Hi Russell,
> snowpatch builds failed for this patch on all 64-bit configurations
> (ppc64e, ppc64 and ppc64le) with the following:
Thanks! Stupid bug on my part, need more quilt ref. Update to follow.
Anton
> arch/powerpc/kernel/dbell.c:85:9: error: undefined identifier
> 'trace_doorbell_entry'
> arch/powerpc/kernel/dbell.c:96:9: error: undefined identifier
> 'trace_doorbell_exit'
> ./arch/powerpc/include/asm/spinlock.h:171:9: warning: context
> imbalance in 'key_user_put' - unexpected unlock
> arch/powerpc/kernel/dbell.c: In function 'doorbell_exception':
> arch/powerpc/kernel/dbell.c:85:2: error: implicit declaration of
> function 'trace_doorbell_entry'; did you mean 'trace_irq_entry'?
> [-Werror=implicit- function-declaration]
> trace_doorbell_entry(regs);
> ^~~~~~~~~~~~~~~~~~~~
> trace_irq_entry
> arch/powerpc/kernel/dbell.c:96:2: error: implicit declaration of
> function 'trace_doorbell_exit'; did you mean 'trace_irq_exit'?
> [-Werror=implicit-function- declaration]
> trace_doorbell_exit(regs);
> ^~~~~~~~~~~~~~~~~~~
> trace_irq_exit
> cc1: all warnings being treated as errors
> scripts/Makefile.build:305: recipe for target
> 'arch/powerpc/kernel/dbell.o' failed make[1]: ***
> [arch/powerpc/kernel/dbell.o] Error 1 Makefile:1060: recipe for
> target 'arch/powerpc/kernel' failed
>
> So does something else need to check for CONFIG_PPC_DOORBELL maybe?
>
> You can see the failures here:
> http://patchwork.ozlabs.org/patch/978088/ - output in build_new.log
> (I know it's not pretty in there yet, you can search for "Error 1" to
> find the build failure)
>
> - Russell
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
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2018-10-04 6:23 [PATCH] powerpc: Add doorbell tracepoints Anton Blanchard
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