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Date: Thu, 11 Oct 2018 20:07:51 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Nicolin Chen <nicoleotsuka@...il.com>
Cc: jdelvare@...e.com, rostedt@...dmis.org,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
mingo@...hat.com
Subject: Re: [PATCH v2] hwmon: (core) Add trace events to _attr_show/store
functions
On Tue, Oct 09, 2018 at 02:42:19PM -0700, Nicolin Chen wrote:
> Trace events are useful for people who collect data from the
> Ftrace outputs. There're people who analyse the relationship
> of cpufreq, thermal and hwmon (power/voltage/current) using
> the convenient and timestamped Ftrace outputs, while unlike
> cpufreq and thermal subsystems the hwmon does not have trace
> events supported yet.
>
> So this patch adds initial trace events for the hwmon core.
> To call hwmon_attr_base() for aligned attr index numbers, it
> also moves the function upward.
>
> Ftrace outputs:
> ...: hwmon_attr_show_string: index=2, attr_name=in2_label, val=VDD_5V
> ...: hwmon_attr_show: index=2, attr_name=in2_input, val=5112
> ...: hwmon_attr_show: index=2, attr_name=curr2_input, val=440
>
> Note that the _attr_show and _attr_store functions are tied
> to the _with_info API. So a hwmon driver requiring the trace
> events feature should use _with_info API to register a hwmon
> device.
>
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
Applied to hwmon-next.
Thanks,
Guenter
> ---
> Changelog
> v1->v2:
> * Added a descriptive reason for this change in the commit message
>
> MAINTAINERS | 1 +
> drivers/hwmon/hwmon.c | 27 ++++++++++----
> include/trace/events/hwmon.h | 71 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 92 insertions(+), 7 deletions(-)
> create mode 100644 include/trace/events/hwmon.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1640b9faa75e..589b32405bf4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6461,6 +6461,7 @@ F: Documentation/devicetree/bindings/hwmon/
> F: Documentation/hwmon/
> F: drivers/hwmon/
> F: include/linux/hwmon*.h
> +F: include/trace/events/hwmon*.h
>
> HARDWARE RANDOM NUMBER GENERATOR CORE
> M: Matt Mackall <mpm@...enic.com>
> diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
> index ac1cdf88840f..975c95169884 100644
> --- a/drivers/hwmon/hwmon.c
> +++ b/drivers/hwmon/hwmon.c
> @@ -24,6 +24,9 @@
> #include <linux/string.h>
> #include <linux/thermal.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/hwmon.h>
> +
> #define HWMON_ID_PREFIX "hwmon"
> #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
>
> @@ -171,6 +174,13 @@ static int hwmon_thermal_add_sensor(struct device *dev,
> }
> #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
>
> +static int hwmon_attr_base(enum hwmon_sensor_types type)
> +{
> + if (type == hwmon_in)
> + return 0;
> + return 1;
> +}
> +
> /* sysfs attribute management */
>
> static ssize_t hwmon_attr_show(struct device *dev,
> @@ -185,6 +195,9 @@ static ssize_t hwmon_attr_show(struct device *dev,
> if (ret < 0)
> return ret;
>
> + trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
> + hattr->name, val);
> +
> return sprintf(buf, "%ld\n", val);
> }
>
> @@ -193,6 +206,7 @@ static ssize_t hwmon_attr_show_string(struct device *dev,
> char *buf)
> {
> struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
> + enum hwmon_sensor_types type = hattr->type;
> const char *s;
> int ret;
>
> @@ -201,6 +215,9 @@ static ssize_t hwmon_attr_show_string(struct device *dev,
> if (ret < 0)
> return ret;
>
> + trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
> + hattr->name, s);
> +
> return sprintf(buf, "%s\n", s);
> }
>
> @@ -221,16 +238,12 @@ static ssize_t hwmon_attr_store(struct device *dev,
> if (ret < 0)
> return ret;
>
> + trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
> + hattr->name, val);
> +
> return count;
> }
>
> -static int hwmon_attr_base(enum hwmon_sensor_types type)
> -{
> - if (type == hwmon_in)
> - return 0;
> - return 1;
> -}
> -
> static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
> {
> return (type == hwmon_temp && attr == hwmon_temp_label) ||
> diff --git a/include/trace/events/hwmon.h b/include/trace/events/hwmon.h
> new file mode 100644
> index 000000000000..d7a1d0ffb679
> --- /dev/null
> +++ b/include/trace/events/hwmon.h
> @@ -0,0 +1,71 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM hwmon
> +
> +#if !defined(_TRACE_HWMON_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_HWMON_H
> +
> +#include <linux/tracepoint.h>
> +
> +DECLARE_EVENT_CLASS(hwmon_attr_class,
> +
> + TP_PROTO(int index, const char *attr_name, long val),
> +
> + TP_ARGS(index, attr_name, val),
> +
> + TP_STRUCT__entry(
> + __field(int, index)
> + __string(attr_name, attr_name)
> + __field(long, val)
> + ),
> +
> + TP_fast_assign(
> + __entry->index = index;
> + __assign_str(attr_name, attr_name);
> + __entry->val = val;
> + ),
> +
> + TP_printk("index=%d, attr_name=%s, val=%ld",
> + __entry->index, __get_str(attr_name), __entry->val)
> +);
> +
> +DEFINE_EVENT(hwmon_attr_class, hwmon_attr_show,
> +
> + TP_PROTO(int index, const char *attr_name, long val),
> +
> + TP_ARGS(index, attr_name, val)
> +);
> +
> +DEFINE_EVENT(hwmon_attr_class, hwmon_attr_store,
> +
> + TP_PROTO(int index, const char *attr_name, long val),
> +
> + TP_ARGS(index, attr_name, val)
> +);
> +
> +TRACE_EVENT(hwmon_attr_show_string,
> +
> + TP_PROTO(int index, const char *attr_name, const char *s),
> +
> + TP_ARGS(index, attr_name, s),
> +
> + TP_STRUCT__entry(
> + __field(int, index)
> + __string(attr_name, attr_name)
> + __string(label, s)
> + ),
> +
> + TP_fast_assign(
> + __entry->index = index;
> + __assign_str(attr_name, attr_name);
> + __assign_str(label, s);
> + ),
> +
> + TP_printk("index=%d, attr_name=%s, val=%s",
> + __entry->index, __get_str(attr_name), __get_str(label))
> +);
> +
> +#endif /* _TRACE_HWMON_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
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