Re: [PATCH] spmi: add command tracepoints for SPMI

[Stephen Boyd]

+Steven Rostedt

On 05/18/15 14:51, Ankit Gupta wrote:
> Add tracepoints to retrieve information about read, write
> and non-data commands. For performance measurement support
> tracepoints are added at the beginning and at the end of
> transfers. Following is a list showing the new tracepoint
> events. The "cmd" parameter here represents the opcode, SID,
> and full 16-bit address.
>
> spmi_write_begin: cmd and data buffer.
> spmi_write_end  : cmd and return value.
> spmi_read_begin : cmd.
> spmi_read_end   : cmd, return value and data buffer.
> spmi_cmd        : cmd.
>
> The reason that cmd appears at both the beginning and at
> the end event is that SPMI drivers can request commands
> concurrently. cmd helps in matching the corresponding
> events.
>
> SPMI tracepoints can be enabled like:
>
> echo 1 >/sys/kernel/debug/tracing/events/spmi/enable
>
> and will dump messages that can be viewed in
> /sys/kernel/debug/tracing/trace that look like:
>
> ... spmi_read_begin: opc=56 sid=00 addr=0x0000
> ... spmi_read_end: opc=56 sid=00 addr=0x0000 ret=0 len=02 buf=0x[01-40]
> ... spmi_write_begin: opc=48 sid=00 addr=0x0000 len=3 buf=0x[ff-ff-ff]
>
> Signed-off-by: Ankit Gupta <ankgupta@xxxxxxxxxxxxxx>
> Signed-off-by: Gilad Avidov <gavidov@xxxxxxxxxxxxxx>
> Suggested-by: Sagar Dharia <sdharia@xxxxxxxxxxxxxx>
> ---

Your Signed-off-by should be last.

>  drivers/spmi/spmi.c         |  22 ++++++-
>  include/trace/events/spmi.h | 136 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 155 insertions(+), 3 deletions(-)
>  create mode 100644 include/trace/events/spmi.h
>
> diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
> index 1d92f51..36fe010 100644
> --- a/drivers/spmi/spmi.c
> +++ b/drivers/spmi/spmi.c
> @@ -21,6 +21,8 @@
>  #include <linux/pm_runtime.h>
>  
>  #include <dt-bindings/spmi/spmi.h>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/spmi.h>
>  
>  static DEFINE_IDA(ctrl_ida);
>  
> @@ -95,28 +97,42 @@ EXPORT_SYMBOL_GPL(spmi_device_remove);
>  static inline int
>  spmi_cmd(struct spmi_controller *ctrl, u8 opcode, u8 sid)
>  {
> +	int ret;
> +
>  	if (!ctrl || !ctrl->cmd || ctrl->dev.type != &spmi_ctrl_type)
>  		return -EINVAL;
>  
> -	return ctrl->cmd(ctrl, opcode, sid);
> +	ret = ctrl->cmd(ctrl, opcode, sid);
> +	trace_spmi_cmd(opcode, sid, ret);
> +	return ret;
>  }
>  
>  static inline int spmi_read_cmd(struct spmi_controller *ctrl, u8 opcode,
>  				u8 sid, u16 addr, u8 *buf, size_t len)
>  {
> +	int ret;
> +
>  	if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &spmi_ctrl_type)
>  		return -EINVAL;
>  
> -	return ctrl->read_cmd(ctrl, opcode, sid, addr, buf, len);
> +	trace_spmi_read_begin(opcode, sid, addr);
> +	ret = ctrl->read_cmd(ctrl, opcode, sid, addr, buf, len);
> +	trace_spmi_read_end(opcode, sid, addr, ret, len, buf);
> +	return ret;
>  }
>  
>  static inline int spmi_write_cmd(struct spmi_controller *ctrl, u8 opcode,
>  				 u8 sid, u16 addr, const u8 *buf, size_t len)
>  {
> +	int ret;
> +
>  	if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &spmi_ctrl_type)
>  		return -EINVAL;
>  
> -	return ctrl->write_cmd(ctrl, opcode, sid, addr, buf, len);
> +	trace_spmi_write_begin(opcode, sid, addr, len, buf);
> +	ret = ctrl->write_cmd(ctrl, opcode, sid, addr, buf, len);
> +	trace_spmi_write_end(opcode, sid, addr, ret);
> +	return ret;
>  }
>  
>  /**
> diff --git a/include/trace/events/spmi.h b/include/trace/events/spmi.h
> new file mode 100644
> index 0000000..241fd1e
> --- /dev/null
> +++ b/include/trace/events/spmi.h
> @@ -0,0 +1,136 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM spmi
> +
> +#if !defined(_TRACE_SPMI_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_SPMI_H
> +
> +#include <linux/spmi.h>
> +#include <linux/tracepoint.h>
> +
> +/*
> + * drivers/spmi/spmi.c
> + */
> +
> +TRACE_EVENT(spmi_write_begin,
> +	TP_PROTO(u8 opcode, u8 sid, u16 addr, u8 len, const u8 *buf),
> +	TP_ARGS(opcode, sid, addr, len, buf),
> +
> +	TP_STRUCT__entry(
> +		__field		( u8,         opcode    )
> +		__field		( u8,         sid       )
> +		__field		( u16,        addr      )
> +		__field		( u8,         len       )
> +		__dynamic_array	( u8,   buf,  len + 1   )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->opcode = opcode;
> +		__entry->sid    = sid;
> +		__entry->addr   = addr;
> +		__entry->len    = len + 1;
> +		memcpy(__get_dynamic_array(buf), buf, len + 1);
> +	),
> +
> +	TP_printk("opc=%d sid=%02d addr=0x%04x len=%d buf=0x[%*phD]",
> +		  (int)__entry->opcode, (int)__entry->sid,
> +		  (int)__entry->addr, (int)__entry->len,
> +		  (int)__entry->len, __get_dynamic_array(buf))
> +);
> +
> +TRACE_EVENT(spmi_write_end,
> +	TP_PROTO(u8 opcode, u8 sid, u16 addr, int ret),
> +	TP_ARGS(opcode, sid, addr, ret),
> +
> +	TP_STRUCT__entry(
> +		__field		( u8,         opcode    )
> +		__field		( u8,         sid       )
> +		__field		( u16,        addr      )
> +		__field		( int,        ret       )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->opcode = opcode;
> +		__entry->sid    = sid;
> +		__entry->addr   = addr;
> +		__entry->ret    = ret;
> +	),
> +
> +	TP_printk("opc=%d sid=%02d addr=0x%04x ret=%d",
> +		  (int)__entry->opcode, (int)__entry->sid,
> +		  (int)__entry->addr, __entry->ret)
> +);
> +
> +TRACE_EVENT(spmi_read_begin,
> +	TP_PROTO(u8 opcode, u8 sid, u16 addr),
> +	TP_ARGS(opcode, sid, addr),
> +
> +	TP_STRUCT__entry(
> +		__field		( u8,         opcode    )
> +		__field		( u8,         sid       )
> +		__field		( u16,        addr      )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->opcode = opcode;
> +		__entry->sid    = sid;
> +		__entry->addr   = addr;
> +	),
> +
> +	TP_printk("opc=%d sid=%02d addr=0x%04x",
> +		  (int)__entry->opcode, (int)__entry->sid,
> +		  (int)__entry->addr)
> +);
> +
> +TRACE_EVENT(spmi_read_end,
> +	TP_PROTO(u8 opcode, u8 sid, u16 addr, int ret, u8 len,

Should "len" be size_t instead of u8? It would at least match the
implementation of spmi_controller::read_cmd(). Same comment for the
write side.

-Stephen

> +		 const u8 *buf),
> +	TP_ARGS(opcode, sid, addr, ret, len, buf),
> +
> +	TP_STRUCT__entry(
> +		__field		( u8,         opcode    )
> +		__field		( u8,         sid       )
> +		__field		( u16,        addr      )
> +		__field		( int,        ret       )
> +		__field		( u8,         len       )
> +		__dynamic_array	( u8,   buf,  len + 1   )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->opcode = opcode;
> +		__entry->sid    = sid;
> +		__entry->addr   = addr;
> +		__entry->ret    = ret;
> +		__entry->len    = len + 1;
> +		memcpy(__get_dynamic_array(buf), buf, len + 1);
> +	),
> +
> +	TP_printk("opc=%d sid=%02d addr=0x%04x ret=%d len=%02d buf=0x[%*phD]",
> +		  (int)__entry->opcode, (int)__entry->sid,
> +		  (int)__entry->addr, __entry->ret, (int)__entry->len,
> +		  (int)__entry->len, __get_dynamic_array(buf))
> +);
> +
> +TRACE_EVENT(spmi_cmd,
> +	TP_PROTO(u8 opcode, u8 sid, int ret),
> +	TP_ARGS(opcode, sid, ret),
> +
> +	TP_STRUCT__entry(
> +		__field		( u8,         opcode    )
> +		__field		( u8,         sid       )
> +		__field		( int,        ret       )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->opcode = opcode;
> +		__entry->sid    = sid;
> +		__entry->ret    = ret;
> +	),
> +
> +	TP_printk("opc=%d sid=%02d ret=%d", (int)__entry->opcode,
> +		  (int)__entry->sid, ret)
> +);
> +
> +#endif /* _TRACE_SPMI_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>


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