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Date: Tue, 13 Dec 2016 12:44:17 -0800
From: Subhash Jadavani <subhashj@...eaurora.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
Ingo Molnar <mingo@...hat.com>,
Sahitya Tummala <stummala@...eaurora.org>,
Venkat Gopalakrishnan <venkatg@...eaurora.org>,
Lee Susman <lsusman@...eaurora.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/12] scsi: ufs: add tracing support
On 2016-12-13 12:10, Steven Rostedt wrote:
> On Tue, 13 Dec 2016 11:48:45 -0800
> Subhash Jadavani <subhashj@...eaurora.org> wrote:
>
>> This change adds the ftrace support for following:
>> 1. UFS initialization time
>> 2. Clock gating states
>> 3. Clock scaling states
>> 4. Power management APIs latency
>> 5. BKOPs enable/disable
>>
>> Usage:
>> echo 1 > /sys/kernel/debug/tracing/events/ufs/enable
>> cat /sys/kernel/debug/tracing/trace_pipe
>>
>> Reviewed-by: Sahitya Tummala <stummala@...eaurora.org>
>> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
>> ---
>> drivers/scsi/ufs/ufshcd.c | 133
>> ++++++++++++++++++++++++++++++++++++----
>> include/trace/events/ufs.h | 149
>> +++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 270 insertions(+), 12 deletions(-)
>> create mode 100644 include/trace/events/ufs.h
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index fe516b2..73c5937 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -45,6 +45,9 @@
>> #include "ufs_quirks.h"
>> #include "unipro.h"
>>
>> +#define CREATE_TRACE_POINTS
>> +#include <trace/events/ufs.h>
>> +
>> #define UFSHCD_REQ_SENSE_SIZE 18
>>
>> #define UFSHCD_ENABLE_INTRS (UTP_TRANSFER_REQ_COMPL |\
>> @@ -721,6 +724,40 @@ static void ufshcd_resume_clkscaling(struct
>> ufs_hba *hba)
>> devfreq_resume_device(hba->devfreq);
>> }
>>
>> +static const char *ufschd_uic_link_state_to_string(
>> + enum uic_link_state state)
>> +{
>> + switch (state) {
>> + case UIC_LINK_OFF_STATE: return "UIC_LINK_OFF_STATE";
>> + case UIC_LINK_ACTIVE_STATE: return "UIC_LINK_ACTIVE_STATE";
>> + case UIC_LINK_HIBERN8_STATE: return "UIC_LINK_HIBERN8_STATE";
>> + default: return "UNKNOWN_STATE";
>> + }
>> +}
>> +
>> +static const char *ufschd_ufs_dev_pwr_mode_to_string(
>> + enum ufs_dev_pwr_mode state)
>> +{
>> + switch (state) {
>> + case UFS_ACTIVE_PWR_MODE: return "UFS_ACTIVE_PWR_MODE";
>> + case UFS_SLEEP_PWR_MODE: return "UFS_SLEEP_PWR_MODE";
>> + case UFS_POWERDOWN_PWR_MODE: return "UFS_POWERDOWN_PWR_MODE";
>> + default: return "UNKNOWN_STATE";
>> + }
>> +}
>> +
>> +static const char *ufschd_clk_gating_state_to_string(
>> + enum clk_gating_state state)
>> +{
>> + switch (state) {
>> + case CLKS_OFF: return "CLKS_OFF";
>> + case CLKS_ON: return "CLKS_ON";
>> + case REQ_CLKS_OFF: return "REQ_CLKS_OFF";
>> + case REQ_CLKS_ON: return "REQ_CLKS_ON";
>> + default: return "UNKNOWN_STATE";
>> + }
>> +}
>> +
>
> A much better way than the above is to use the TRACE_DEFINE_ENUM()
> macros in the include/trace/events/ufs.h header. In fact, that's what
> it was made for. Not only will it be much faster to record, it wont
> waste as much space in the ring buffer.
>
> .e.g.
>
> #define UFS_LINK_STATES \
> EM( UIC_LINK_OFF_STATE ) \
> EM( UIC_LINK_ACTIVE_STATE ) \
> EMe(UIC_LINK_HIBERN8_STATE )
>
> #define UFS_PWR_MODES \
> EM( UFS_ACTIVE_PWR_MODE ) \
> EM( UFS_SLEEP_PWR_MODE ) \
> EM( UFS_POWERDOWN_PWR_MODE) \
> EMe(UFS_POWERDOWN_PWR_MODE)
>
> #define UFSCHD_CLK_GATING_STATES \
> EM( CLKS_OFF) \
> EM( CLKS_ON) \
> EM( REQ_CLKS_OFF) \
> EMe(REQ_CLKS_ON)
>
> #undef EM
> #undef EMe
>
> #define EM(a) TRACE_DEFINE_ENUM(a);
> #define EMe(a) TRACE_DEFINE_ENUM(a);
>
> UFS_LINK_STATES
> UFS_PWR_MODES
> UFSCHD_CLK_GATING_STATES
>
> #undef EM
> #undef EMe
>
> #define EM(a) { a, #a },
> #define EMe(a) { a, #a }
>
>
> DECLARE_EVENT_CLASS(ufshcd_template,
> TP_PROTO(const char *dev_name int err, s64 usecs,
> int state, int link_state);
>
> [..]
>
> TP_printk(
> "%s: took %lld, dev_state: %s, link_state: %s, err %d",
> get_str(dev_name),
> __entry->usecs,
> __print_symbolic(__entry->state, UFS_PWR_MODES),
> __print_symbolic(__entry->link_state, UFS_LINK_STATES),
> __entry->err
> )
>
> Not to mention, I think some of the strings may not be matching what
> was passed in.
Thanks for the suggestion. Let me check this.
>
> -- Steve
>
>
>
>> +DECLARE_EVENT_CLASS(ufshcd_template,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> +
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state),
>> +
>> + TP_STRUCT__entry(
>> + __field(s64, usecs)
>> + __field(int, err)
>> + __string(dev_name, dev_name)
>> + __string(dev_state, dev_state)
>> + __string(link_state, link_state)
>> + ),
>> +
>> + TP_fast_assign(
>> + __entry->usecs = usecs;
>> + __entry->err = err;
>> + __assign_str(dev_name, dev_name);
>> + __assign_str(dev_state, dev_state);
>> + __assign_str(link_state, link_state);
>> + ),
>> +
>> + TP_printk(
>> + "%s: took %lld usecs, dev_state: %s, link_state: %s, err %d",
>> + __get_str(dev_name),
>> + __entry->usecs,
>> + __get_str(dev_state),
>> + __get_str(link_state),
>> + __entry->err
>> + )
>> +);
>> +
>> +DEFINE_EVENT(ufshcd_template, ufshcd_system_suspend,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>> +
>> +DEFINE_EVENT(ufshcd_template, ufshcd_system_resume,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>> +
>> +DEFINE_EVENT(ufshcd_template, ufshcd_runtime_suspend,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>> +
>> +DEFINE_EVENT(ufshcd_template, ufshcd_runtime_resume,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>> +
>> +DEFINE_EVENT(ufshcd_template, ufshcd_init,
>> + TP_PROTO(const char *dev_name, int err, s64 usecs,
>> + const char *dev_state, const char *link_state),
>> + TP_ARGS(dev_name, err, usecs, dev_state, link_state));
>> +#endif /* if !defined(_TRACE_UFS_H) ||
>> defined(TRACE_HEADER_MULTI_READ) */
>> +
>> +/* This part must be outside protection */
>> +#include <trace/define_trace.h>
--
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