[PATCH] nvme: trace: parse format nvm command in detail

[Minwoo Im]

Hello,

On 21-01-04 16:53:43, Michal Krakowiak wrote:
> FTrace does not parse NVMe commands consistently. There are commands
> that are being parsed in detail and commands for which the trace log
> contains only raw bytes of command dwords. Add detailed parsing of
> format nvm admin command to make the trace log more consistent and
> human-readable.
> 
> Signed-off-by: Michal Krakowiak <michal.krakowiak at intel.com>
> Acked-by: Dan Williams <dan.j.williams at intel.com>

Looks good to me unless driver decides to go to raw trace with
user-space application like blkparse according to Keith's opinion.

Actually Format command has several meaningful fields related
to LBA format and protection information slo so that I would be happy
for format command to be parsed for now.

Reviewed-by: Minwoo Im <minwoo.im.dev at gmail.com>

Thanks,

> ---
>  drivers/nvme/host/trace.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/nvme/host/trace.c b/drivers/nvme/host/trace.c
> index 5c3cb6928f3c..e0400de713b5 100644
> --- a/drivers/nvme/host/trace.c
> +++ b/drivers/nvme/host/trace.c
> @@ -102,6 +102,23 @@ static const char *nvme_trace_get_lba_status(struct trace_seq *p,
>  	return ret;
>  }
> 
> +static const char *nvme_trace_admin_format_nvm(struct trace_seq *p, u8 *cdw10)
> +{
> +	const char *ret = trace_seq_buffer_ptr(p);
> +	u8 lbaf = cdw10[0] & 0xF;
> +	u8 mset = (cdw10[0] >> 4) & 0x1;
> +	u8 pi = (cdw10[0] >> 5) & 0x7;
> +	u8 pil = cdw10[1] & 0x1;
> +	u8 ses = (cdw10[1] >> 1) & 0x7;
> +
> +	trace_seq_printf(p, "lbaf=%u, mset=%u, pi=%u, pil=%u, ses=%u",
> +			lbaf, mset, pi, pil, ses);
> +
> +	trace_seq_putc(p, 0);
> +
> +	return ret;
> +}
> +
>  static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10)
>  {
>  	const char *ret = trace_seq_buffer_ptr(p);
> @@ -159,6 +176,8 @@ const char *nvme_trace_parse_admin_cmd(struct trace_seq *p,
>  		return nvme_trace_admin_get_features(p, cdw10);
>  	case nvme_admin_get_lba_status:
>  		return nvme_trace_get_lba_status(p, cdw10);
> +	case nvme_admin_format_nvm:
> +		return nvme_trace_admin_format_nvm(p, cdw10);
>  	default:
>  		return nvme_trace_common(p, cdw10);
>  	}
> --
> 2.20.1
> 
> 
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