[PATCH v2 3/4] powerpc/tracing: tracepoints for RTAS entry and exit
Nathan Lynch
nathanl at linux.ibm.com
Tue Dec 13 10:01:53 AEDT 2022
Add two sets of tracepoints to be used around RTAS entry:
* rtas_input/rtas_output, which emit the function name, its inputs,
the returned status, and any other outputs. These produce an API-level
record of OS<->RTAS activity.
* rtas_ll_entry/rtas_ll_exit, which are lower-level and emit the
entire contents of the parameter block (aka rtas_args) on entry and
exit. Likely useful only for debugging.
With uses of these tracepoints in do_enter_rtas() to be added in the
following patch, examples of get-time-of-day and event-scan functions
as rendered by trace-cmd (with some multi-line formatting manually
imposed on the rtas_ll_* entries to avoid extremely long lines in the
commit message):
cat-36800 [059] 4978.518303: rtas_input: get-time-of-day arguments:
cat-36800 [059] 4978.518306: rtas_ll_entry: token=3 nargs=0 nret=8
params: [0]=0x00000000 [1]=0x00000000 [2]=0x00000000 [3]=0x00000000
[4]=0x00000000 [5]=0x00000000 [6]=0x00000000 [7]=0x00000000
[8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
[12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
cat-36800 [059] 4978.518366: rtas_ll_exit: token=3 nargs=0 nret=8
params: [0]=0x00000000 [1]=0x000007e6 [2]=0x0000000b [3]=0x00000001
[4]=0x00000000 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
[8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
[12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
cat-36800 [059] 4978.518366: rtas_output: get-time-of-day status: 0, other outputs: 2022 11 1 0 14 8 772648000
kworker/39:1-336 [039] 4982.731623: rtas_input: event-scan arguments: 4294967295 0 80484920 2048
kworker/39:1-336 [039] 4982.731626: rtas_ll_entry: token=6 nargs=4 nret=1
params: [0]=0xffffffff [1]=0x00000000 [2]=0x04cc1a38 [3]=0x00000800
[4]=0x00000000 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
[8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
[12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
kworker/39:1-336 [039] 4982.731676: rtas_ll_exit: token=6 nargs=4 nret=1
params: [0]=0xffffffff [1]=0x00000000 [2]=0x04cc1a38 [3]=0x00000800
[4]=0x00000001 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
[8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
[12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
kworker/39:1-336 [039] 4982.731677: rtas_output: event-scan status: 1, other outputs:
Signed-off-by: Nathan Lynch <nathanl at linux.ibm.com>
---
arch/powerpc/include/asm/trace.h | 103 +++++++++++++++++++++++++++++++
1 file changed, 103 insertions(+)
diff --git a/arch/powerpc/include/asm/trace.h b/arch/powerpc/include/asm/trace.h
index 08cd60cd70b7..82cc2c6704e6 100644
--- a/arch/powerpc/include/asm/trace.h
+++ b/arch/powerpc/include/asm/trace.h
@@ -119,6 +119,109 @@ TRACE_EVENT_FN_COND(hcall_exit,
);
#endif
+#ifdef CONFIG_PPC_RTAS
+
+#include <asm/rtas-types.h>
+
+TRACE_EVENT(rtas_input,
+
+ TP_PROTO(struct rtas_args *rtas_args, const char *name),
+
+ TP_ARGS(rtas_args, name),
+
+ TP_STRUCT__entry(
+ __field(__u32, nargs)
+ __string(name, name)
+ __dynamic_array(__u32, inputs, be32_to_cpu(rtas_args->nargs))
+ ),
+
+ TP_fast_assign(
+ __entry->nargs = be32_to_cpu(rtas_args->nargs);
+ __assign_str(name, name);
+ be32_to_cpu_array(__get_dynamic_array(inputs), rtas_args->args, __entry->nargs);
+ ),
+
+ TP_printk("%s arguments: %s", __get_str(name),
+ __print_array(__get_dynamic_array(inputs), __entry->nargs, 4)
+ )
+);
+
+TRACE_EVENT(rtas_output,
+
+ TP_PROTO(struct rtas_args *rtas_args, const char *name),
+
+ TP_ARGS(rtas_args, name),
+
+ TP_STRUCT__entry(
+ __field(__u32, nr_other)
+ __field(__s32, status)
+ __string(name, name)
+ __dynamic_array(__u32, other_outputs, be32_to_cpu(rtas_args->nret) - 1)
+ ),
+
+ TP_fast_assign(
+ __entry->nr_other = be32_to_cpu(rtas_args->nret) - 1;
+ __entry->status = be32_to_cpu(rtas_args->rets[0]);
+ __assign_str(name, name);
+ be32_to_cpu_array(__get_dynamic_array(other_outputs),
+ &rtas_args->rets[1], __entry->nr_other);
+ ),
+
+ TP_printk("%s status: %d, other outputs: %s", __get_str(name), __entry->status,
+ __print_array(__get_dynamic_array(other_outputs),
+ __entry->nr_other, 4)
+ )
+);
+
+DECLARE_EVENT_CLASS(rtas_parameter_block,
+
+ TP_PROTO(struct rtas_args *rtas_args),
+
+ TP_ARGS(rtas_args),
+
+ TP_STRUCT__entry(
+ __field(u32, token)
+ __field(u32, nargs)
+ __field(u32, nret)
+ __array(__u32, params, 16)
+ ),
+
+ TP_fast_assign(
+ __entry->token = be32_to_cpu(rtas_args->token);
+ __entry->nargs = be32_to_cpu(rtas_args->nargs);
+ __entry->nret = be32_to_cpu(rtas_args->nret);
+ be32_to_cpu_array(__entry->params, rtas_args->args, ARRAY_SIZE(rtas_args->args));
+ ),
+
+ TP_printk("token=%u nargs=%u nret=%u params:"
+ " [0]=0x%08x [1]=0x%08x [2]=0x%08x [3]=0x%08x"
+ " [4]=0x%08x [5]=0x%08x [6]=0x%08x [7]=0x%08x"
+ " [8]=0x%08x [9]=0x%08x [10]=0x%08x [11]=0x%08x"
+ " [12]=0x%08x [13]=0x%08x [14]=0x%08x [15]=0x%08x",
+ __entry->token, __entry->nargs, __entry->nret,
+ __entry->params[0], __entry->params[1], __entry->params[2], __entry->params[3],
+ __entry->params[4], __entry->params[5], __entry->params[6], __entry->params[7],
+ __entry->params[8], __entry->params[9], __entry->params[10], __entry->params[11],
+ __entry->params[12], __entry->params[13], __entry->params[14], __entry->params[15]
+ )
+);
+
+DEFINE_EVENT(rtas_parameter_block, rtas_ll_entry,
+
+ TP_PROTO(struct rtas_args *rtas_args),
+
+ TP_ARGS(rtas_args)
+);
+
+DEFINE_EVENT(rtas_parameter_block, rtas_ll_exit,
+
+ TP_PROTO(struct rtas_args *rtas_args),
+
+ TP_ARGS(rtas_args)
+);
+
+#endif /* CONFIG_PPC_RTAS */
+
#ifdef CONFIG_PPC_POWERNV
extern int opal_tracepoint_regfunc(void);
extern void opal_tracepoint_unregfunc(void);
--
2.37.1
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