nvmet: add tracing of reservation commands

Add tracing of reservation commands, including register, acquire,
release and report, and also parse the action and rtype to string
to make the trace log more human-readable.

Signed-off-by: Guixin Liu <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

Author: guixinliu1995

drivers/nvme/target/trace.c

@@ -180,6 +180,106 @@ static const char *nvmet_trace_zone_mgmt_recv(struct trace_seq *p, u8 *cdw10)
 	return ret;
 }
 
+static const char *nvmet_trace_resv_reg(struct trace_seq *p, u8 *cdw10)
+{
+	static const char * const rrega_strs[] = {
+		[0x00] = "register",
+		[0x01] = "unregister",
+		[0x02] = "replace",
+	};
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 rrega = cdw10[0] & 0x7;
+	u8 iekey = (cdw10[0] >> 3) & 0x1;
+	u8 ptpl = (cdw10[3] >> 6) & 0x3;
+	const char *rrega_str;
+
+	if (rrega < ARRAY_SIZE(rrega_strs) && rrega_strs[rrega])
+		rrega_str = rrega_strs[rrega];
+	else
+		rrega_str = "reserved";
+
+	trace_seq_printf(p, "rrega=%u:%s, iekey=%u, ptpl=%u",
+			 rrega, rrega_str, iekey, ptpl);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char * const rtype_strs[] = {
+	[0x00] = "reserved",
+	[0x01] = "write exclusive",
+	[0x02] = "exclusive access",
+	[0x03] = "write exclusive registrants only",
+	[0x04] = "exclusive access registrants only",
+	[0x05] = "write exclusive all registrants",
+	[0x06] = "exclusive access all registrants",
+};
+
+static const char *nvmet_trace_resv_acq(struct trace_seq *p, u8 *cdw10)
+{
+	static const char * const racqa_strs[] = {
+		[0x00] = "acquire",
+		[0x01] = "preempt",
+		[0x02] = "preempt and abort",
+	};
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 racqa = cdw10[0] & 0x7;
+	u8 iekey = (cdw10[0] >> 3) & 0x1;
+	u8 rtype = cdw10[1];
+	const char *racqa_str = "reserved";
+	const char *rtype_str = "reserved";
+
+	if (racqa < ARRAY_SIZE(racqa_strs) && racqa_strs[racqa])
+		racqa_str = racqa_strs[racqa];
+
+	if (rtype < ARRAY_SIZE(rtype_strs) && rtype_strs[rtype])
+		rtype_str = rtype_strs[rtype];
+
+	trace_seq_printf(p, "racqa=%u:%s, iekey=%u, rtype=%u:%s",
+			 racqa, racqa_str, iekey, rtype, rtype_str);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char *nvmet_trace_resv_rel(struct trace_seq *p, u8 *cdw10)
+{
+	static const char * const rrela_strs[] = {
+		[0x00] = "release",
+		[0x01] = "clear",
+	};
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 rrela = cdw10[0] & 0x7;
+	u8 iekey = (cdw10[0] >> 3) & 0x1;
+	u8 rtype = cdw10[1];
+	const char *rrela_str = "reserved";
+	const char *rtype_str = "reserved";
+
+	if (rrela < ARRAY_SIZE(rrela_strs) && rrela_strs[rrela])
+		rrela_str = rrela_strs[rrela];
+
+	if (rtype < ARRAY_SIZE(rtype_strs) && rtype_strs[rtype])
+		rtype_str = rtype_strs[rtype];
+
+	trace_seq_printf(p, "rrela=%u:%s, iekey=%u, rtype=%u:%s",
+			 rrela, rrela_str, iekey, rtype, rtype_str);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
+static const char *nvmet_trace_resv_report(struct trace_seq *p, u8 *cdw10)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u32 numd = get_unaligned_le32(cdw10);
+	u8 eds = cdw10[4] & 0x1;
+
+	trace_seq_printf(p, "numd=%u, eds=%u", numd, eds);
+	trace_seq_putc(p, 0);
+
+	return ret;
+}
+
 const char *nvmet_trace_parse_nvm_cmd(struct trace_seq *p,
 		u8 opcode, u8 *cdw10)
 {
@@ -195,6 +295,14 @@ const char *nvmet_trace_parse_nvm_cmd(struct trace_seq *p,
 		return nvmet_trace_zone_mgmt_send(p, cdw10);
 	case nvme_cmd_zone_mgmt_recv:
 		return nvmet_trace_zone_mgmt_recv(p, cdw10);
+	case nvme_cmd_resv_register:
+		return nvmet_trace_resv_reg(p, cdw10);
+	case nvme_cmd_resv_acquire:
+		return nvmet_trace_resv_acq(p, cdw10);
+	case nvme_cmd_resv_release:
+		return nvmet_trace_resv_rel(p, cdw10);
+	case nvme_cmd_resv_report:
+		return nvmet_trace_resv_report(p, cdw10);
 	default:
 		return nvmet_trace_common(p, cdw10);
 	}