From: Hou Pu <houpu.main@gmail.com>
Date: Mon, 5 Jul 2021 03:15:29 +0000 (+0800)
Subject: nvmet: add set feature tracing support
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8d84f9de69ca23f2637dc19d96f39228c8426e97;p=linux.git

nvmet: add set feature tracing support

A nvme connect command produces following trace from the target side.

Before:
    kworker/0:1H-56      [000] ....  9012.155139: nvmet_req_init: nvmet1: qid=0, cmdid=16, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, cdw10=07 00 00 00 07 00 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)
    kworker/0:1H-56      [000] ....  9012.872272: nvmet_req_init: nvmet1: qid=0, cmdid=13, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, cdw10=0b 00 00 00 00 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00)

cmdline:/sys/kernel/debug/tracing# cat trace | grep feature
    kworker/0:1H-56      [000] ....   203.493914: nvmet_req_init: nvmet1: qid=0, cmdid=29, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, fid=0x7, sv=0x0, cdw11=0x70007)
    kworker/0:1H-56      [000] ....   204.197079: nvmet_req_init: nvmet1: qid=0, cmdid=29, nsid=0, flags=0x40, meta=0x0, cmd=(nvme_admin_set_features, fid=0xb, sv=0x0, cdw11=0x900)

Using ',' to separate different field like others in
nvmet_trace_admin_get_features.

Signed-off-by: Hou Pu <houpu.main@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/nvme/target/trace.c b/drivers/nvme/target/trace.c
index 1373a3c67962a..bff454d46255b 100644
--- a/drivers/nvme/target/trace.c
+++ b/drivers/nvme/target/trace.c
@@ -27,7 +27,7 @@ static const char *nvmet_trace_admin_get_features(struct trace_seq *p,
 	u8 sel = cdw10[1] & 0x7;
 	u32 cdw11 = get_unaligned_le32(cdw10 + 4);
 
-	trace_seq_printf(p, "fid=0x%x sel=0x%x cdw11=0x%x", fid, sel, cdw11);
+	trace_seq_printf(p, "fid=0x%x, sel=0x%x, cdw11=0x%x", fid, sel, cdw11);
 	trace_seq_putc(p, 0);
 
 	return ret;
@@ -49,6 +49,20 @@ static const char *nvmet_trace_get_lba_status(struct trace_seq *p,
 	return ret;
 }
 
+static const char *nvmet_trace_admin_set_features(struct trace_seq *p,
+						 u8 *cdw10)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 fid = cdw10[0];
+	u8 sv = cdw10[3] & 0x8;
+	u32 cdw11 = get_unaligned_le32(cdw10 + 4);
+
+	trace_seq_printf(p, "fid=0x%x, sv=0x%x, cdw11=0x%x", fid, sv, cdw11);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
 static const char *nvmet_trace_read_write(struct trace_seq *p, u8 *cdw10)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
@@ -94,6 +108,8 @@ const char *nvmet_trace_parse_admin_cmd(struct trace_seq *p,
 	switch (opcode) {
 	case nvme_admin_identify:
 		return nvmet_trace_admin_identify(p, cdw10);
+	case nvme_admin_set_features:
+		return nvmet_trace_admin_set_features(p, cdw10);
 	case nvme_admin_get_features:
 		return nvmet_trace_admin_get_features(p, cdw10);
 	case nvme_admin_get_lba_status: