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

[Michal Krakowiak]

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>
---
 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