linux-kernel - Re: [PATCH v5 2/2] remoteproc: qcom: Add remoteproc tracing

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Date:   Tue, 13 Jun 2023 11:28:45 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
Cc:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        "Elliot Berman" <quic_eberman@...cinc.com>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>
Subject: Re: [PATCH v5 2/2] remoteproc: qcom: Add remoteproc tracing

On Mon, 12 Jun 2023 15:03:26 -0700
Gokul krishna Krishnakumar <quic_gokukris@...cinc.com> wrote:

> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index d4dbb8d1d80c..f7cb31b94a60 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -14,6 +14,7 @@
>  
>  #include <linux/irqreturn.h>
>  #include <linux/firmware.h>
> +#include <trace/events/remoteproc_tracepoints.h>
>  
>  struct rproc;
>  
> @@ -171,8 +172,13 @@ u64 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
>  static inline
>  int rproc_load_segments(struct rproc *rproc, const struct firmware *fw)
>  {
> -	if (rproc->ops->load)
> -		return rproc->ops->load(rproc, fw);
> +	if (rproc->ops->load) {
> +		int ret;
> +
> +		ret = rproc->ops->load(rproc, fw);
> +		trace_rproc_load_segment_event(rproc, ret);
> +		return ret;
> +	}
>  
>  	return -EINVAL;
>  }

So, tracepoints in header files tend to cause problems due to the way they
are created. See the comment in include/linux/tracepoint-defs.h.

What you need to do is:

#include <linux/tracepoint-defs.h>

DECLARE_TRACEPOINT(rproc_load_segment_event);

extern void call_trace_rproc_load_segment_event(struct rproc *rproc, int ret);

static inline void test_trace_rproc_load_segment_event(struct rproc *rproc, int ret)
{
	if (trace_rproc_load_segment_event_enabled())
		call_trace_rproc_load_segment_event(rproc, ret);
}

After adding the above in the header. In the C file, add:

void call_trace_rproc_load_segment_event(struct rproc *rproc, int ret)
{
	trace_rproc_load_segment_event(rproc, ret);
}

-- Steve