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Subject: Re: [PATCH linux dev-4.13 04/16] fsi: sbefifo: Add tracing of
 transfers
To: Andrew Jeffery <andrew@aj.id.au>, joel@jms.id.au, jk@ozlabs.org,
 bradleyb@fuzziesquirrel.com, cbostic@linux.vnet.ibm.com
Cc: openbmc@lists.ozlabs.org
References: <20180220041844.13228-1-andrew@aj.id.au>
 <20180220041844.13228-5-andrew@aj.id.au>
From: Eddie James <eajames@linux.vnet.ibm.com>
Date: Thu, 22 Feb 2018 14:28:54 -0600
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On 02/19/2018 10:18 PM, Andrew Jeffery wrote:
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

Acked-by: Eddie James <eajames@linux.vnet.ibm.com>

> ---
>   drivers/fsi/fsi-sbefifo.c      | 16 ++++++++
>   include/trace/events/sbefifo.h | 93 ++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 109 insertions(+)
>   create mode 100644 include/trace/events/sbefifo.h
>
> diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
> index 699de6b9a4eb..ef4a141dee2a 100644
> --- a/drivers/fsi/fsi-sbefifo.c
> +++ b/drivers/fsi/fsi-sbefifo.c
> @@ -33,6 +33,9 @@
>   #include <linux/uaccess.h>
>   #include <linux/wait.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/sbefifo.h>
> +
>   /*
>    * The SBEFIFO is a pipe-like FSI device for communicating with
>    * the self boot engine on POWER processors.
> @@ -275,6 +278,8 @@ static struct sbefifo_xfr *sbefifo_enq_xfr(struct sbefifo_client *client)
>   	if (!xfr)
>   		return ERR_PTR(-ENOMEM);
>
> +	trace_sbefifo_enq_xfer(client, xfr);
> +
>   	xfr->rbuf = &client->rbuf;
>   	xfr->wbuf = &client->wbuf;
>   	list_add_tail(&xfr->xfrs, &sbefifo->xfrs);
> @@ -303,6 +308,8 @@ static struct sbefifo_client *sbefifo_new_client(struct sbefifo *sbefifo)
>   	if (!client)
>   		return NULL;
>
> +	trace_sbefifo_new_client(client);
> +
>   	kref_init(&client->kref);
>   	client->dev = sbefifo;
>   	sbefifo_buf_init(&client->rbuf);
> @@ -343,6 +350,7 @@ static void sbefifo_release_client(struct kref *kref)
>   	}
>
>   	sbefifo_put(sbefifo);
> +	trace_sbefifo_release_client(client);
>   	kfree(client);
>   }
>
> @@ -393,6 +401,8 @@ static void sbefifo_poll_timer(unsigned long data)
>   	if (!xfr)
>   		goto out_unlock;
>
> +	trace_sbefifo_begin_xfer(xfr);
> +
>   	rbuf = xfr->rbuf;
>   	wbuf = xfr->wbuf;
>
> @@ -506,6 +516,8 @@ static void sbefifo_poll_timer(unsigned long data)
>   	}
>
>   out:
> +	trace_sbefifo_end_xfer(xfr, ret);
> +
>   	if (unlikely(ret)) {
>   		sbefifo->rc = ret;
>   		dev_err(&sbefifo->fsi_dev->dev,
> @@ -612,6 +624,10 @@ static ssize_t sbefifo_read_common(struct sbefifo_client *client,
>   		goto out;
>   	}
>
> +	trace_sbefifo_deq_xfer(client, list_first_entry_or_null(&client->xfrs,
> +							   struct sbefifo_xfr,
> +							   client));
> +
>   	n = min_t(size_t, n, len);
>
>   	if (ubuf) {
> diff --git a/include/trace/events/sbefifo.h b/include/trace/events/sbefifo.h
> new file mode 100644
> index 000000000000..4755fcb23e56
> --- /dev/null
> +++ b/include/trace/events/sbefifo.h
> @@ -0,0 +1,93 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM sbefifo
> +
> +#if !defined(_TRACE_TIMER_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_SBEFIFO_H
> +
> +#include <linux/tracepoint.h>
> +#include <linux/fsi-sbefifo.h>
> +
> +TRACE_EVENT(sbefifo_new_client,
> +	TP_PROTO(const void *client),
> +	TP_ARGS(client),
> +	TP_STRUCT__entry(
> +		__field(const void *, client)
> +	),
> +	TP_fast_assign(
> +		__entry->client = client;
> +	),
> +	TP_printk("New client: %p", __entry->client)
> +);
> +
> +TRACE_EVENT(sbefifo_release_client,
> +	TP_PROTO(const void *client),
> +	TP_ARGS(client),
> +	TP_STRUCT__entry(
> +		__field(const void *, client)
> +	),
> +	TP_fast_assign(
> +		__entry->client = client;
> +	),
> +	TP_printk("Released client: %p", __entry->client)
> +);
> +
> +TRACE_EVENT(sbefifo_enq_xfer,
> +	TP_PROTO(const void *client, const void *xfer),
> +	TP_ARGS(client, xfer),
> +	TP_STRUCT__entry(
> +		__field(const void *, client)
> +		__field(const void *, xfer)
> +	),
> +	TP_fast_assign(
> +		__entry->client = client;
> +		__entry->xfer = xfer;
> +	),
> +	TP_printk("Client %p enqueued transfer %p",
> +		  __entry->client, __entry->xfer)
> +);
> +
> +TRACE_EVENT(sbefifo_begin_xfer,
> +	TP_PROTO(const void *xfer),
> +	TP_ARGS(xfer),
> +	TP_STRUCT__entry(
> +		__field(const void *, xfer)
> +	),
> +	TP_fast_assign(
> +		__entry->xfer = xfer;
> +	),
> +	TP_printk("Began transfer %p",
> +		  __entry->xfer)
> +);
> +
> +TRACE_EVENT(sbefifo_end_xfer,
> +	TP_PROTO(const void *xfer, int ret),
> +	TP_ARGS(xfer, ret),
> +	TP_STRUCT__entry(
> +		__field(const void *, xfer)
> +		__field(int, ret)
> +	),
> +	TP_fast_assign(
> +		__entry->xfer = xfer;
> +		__entry->ret = ret;
> +	),
> +	TP_printk("Completed transfer %p: %d",
> +		  __entry->xfer, __entry->ret)
> +);
> +
> +TRACE_EVENT(sbefifo_deq_xfer,
> +	TP_PROTO(const void *client, const void *xfer),
> +	TP_ARGS(client, xfer),
> +	TP_STRUCT__entry(
> +		__field(const void *, client)
> +		__field(const void *, xfer)
> +	),
> +	TP_fast_assign(
> +		__entry->client = client;
> +		__entry->xfer = xfer;
> +	),
> +	TP_printk("Client %p dequeueing transfer %p",
> +		  __entry->client, __entry->xfer)
> +);
> +#endif
> +
> +#include <trace/define_trace.h>