Re: [PATCH v2 6/7] perf cs-etm: Detect pid in VMID for kernel running at EL2

[Suzuki K Poulose]

On 2/2/21 4:38 PM, Leo Yan wrote:
> From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
>
> The PID of the task could be traced as VMID when the kernel is running
> at EL2.  Teach the decoder to look for VMID when the CONTEXTIDR (Arm32)
> or CONTEXTIDR_EL1 (Arm64) is invalid but we have a valid VMID.
>
> Cc: Mike Leach <mike.leach@xxxxxxxxxx>
> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Cc: Al Grant <al.grant@xxxxxxx>
> Co-developed-by: Leo Yan <leo.yan@xxxxxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
> ---
>   .../perf/util/cs-etm-decoder/cs-etm-decoder.c | 32 ++++++++++++++++---
>   1 file changed, 28 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> index 3f4bc4050477..fb2a163ff74e 100644
> --- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> +++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
> @@ -6,6 +6,7 @@
>    * Author: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
>    */
>   
> +#include <linux/coresight-pmu.h>
>   #include <linux/err.h>
>   #include <linux/list.h>
>   #include <linux/zalloc.h>
> @@ -491,13 +492,36 @@ cs_etm_decoder__set_tid(struct cs_etm_queue *etmq,
>   			const ocsd_generic_trace_elem *elem,
>   			const uint8_t trace_chan_id)
>   {
> -	pid_t tid;
> +	pid_t tid = -1;
> +	u64 pid_fmt;
> +	int ret;
>   
> -	/* Ignore PE_CONTEXT packets that don't have a valid contextID */
> -	if (!elem->context.ctxt_id_valid)
> +	ret = cs_etm__get_pid_fmt(trace_chan_id, &pid_fmt);
> +	if (ret)

Is this something we can cache in this function ? e.g,
	static u64 pid_fmt;

	if (!pid_pfmt)
		ret = cs_etm__get_pid_fmt(trace_chan_id, &pid_fmt);

As all the ETMs will be running at the same exception level.

> +		return OCSD_RESP_FATAL_SYS_ERR;
> +
> +	/*
> +	 * Process the PE_CONTEXT packets if we have a valid contextID or VMID.
> +	 * If the kernel is running at EL2, the PID is traced in CONTEXTIDR_EL2
> +	 * as VMID, Bit ETM_OPT_CTXTID2 is set in this case.
> +	 */
> +	switch (pid_fmt) {
> +	case BIT(ETM_OPT_CTXTID):
> +		if (elem->context.ctxt_id_valid)
> +			tid = elem->context.context_id;
> +		break;
> +	case BIT(ETM_OPT_CTXTID2) | BIT(ETM_OPT_CTXTID):

I would rather fix the cs_etm__get_pid_fmt() to return either of these
as commented. i.e, ETM_OPT_CTXTID or ETM_OPT_CTXTID2. Thus we don't
need the this case.


With the above two addressed:

Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>