linux-kernel - [PATCH RFC v2 15/18] cxl/mem: Trace Dynamic capacity Event Record

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Message-Id: <20230604-dcd-type2-upstream-v2-15-f740c47e7916@intel.com>
Date:   Mon, 28 Aug 2023 22:21:06 -0700
From:   ira.weiny@...el.com
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Navneet Singh <navneet.singh@...el.com>,
        Fan Ni <fan.ni@...sung.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC v2 15/18] cxl/mem: Trace Dynamic capacity Event Record

From: Navneet Singh <navneet.singh@...el.com>

CXL rev 3.0 section 8.2.9.2.1.5 defines the Dynamic Capacity Event Record
Determine if the event read is a Dynamic capacity event record and
if so trace the record for the debug purpose.

Add DC trace points to the trace log.

Signed-off-by: Navneet Singh <navneet.singh@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
[iweiny: fixups]
---
 drivers/cxl/core/mbox.c  |  5 ++++
 drivers/cxl/core/trace.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 9d9c13e13ecf..9462c34aa1dc 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -939,6 +939,11 @@ static void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
 				(struct cxl_event_mem_module *)record;
 
 		trace_cxl_memory_module(cxlmd, type, rec);
+	} else if (uuid_equal(id, &dc_event_uuid)) {
+		struct dcd_event_dyn_cap *rec =
+				(struct dcd_event_dyn_cap *)record;
+
+		trace_cxl_dynamic_capacity(cxlmd, type, rec);
 	} else {
 		/* For unknown record types print just the header */
 		trace_cxl_generic_event(cxlmd, type, record);
diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index a0b5819bc70b..1899c5cc96b9 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -703,6 +703,71 @@ TRACE_EVENT(cxl_poison,
 	)
 );
 
+/*
+ * DYNAMIC CAPACITY Event Record - DER
+ *
+ * CXL rev 3.0 section 8.2.9.2.1.5 Table 8-47
+ */
+
+#define CXL_DC_ADD_CAPACITY			0x00
+#define CXL_DC_REL_CAPACITY			0x01
+#define CXL_DC_FORCED_REL_CAPACITY		0x02
+#define CXL_DC_REG_CONF_UPDATED			0x03
+#define show_dc_evt_type(type)	__print_symbolic(type,		\
+	{ CXL_DC_ADD_CAPACITY,	"Add capacity"},		\
+	{ CXL_DC_REL_CAPACITY,	"Release capacity"},		\
+	{ CXL_DC_FORCED_REL_CAPACITY,	"Forced capacity release"},	\
+	{ CXL_DC_REG_CONF_UPDATED,	"Region Configuration Updated"	} \
+)
+
+TRACE_EVENT(cxl_dynamic_capacity,
+
+	TP_PROTO(const struct cxl_memdev *cxlmd, enum cxl_event_log_type log,
+		 struct dcd_event_dyn_cap  *rec),
+
+	TP_ARGS(cxlmd, log, rec),
+
+	TP_STRUCT__entry(
+		CXL_EVT_TP_entry
+
+		/* Dynamic capacity Event */
+		__field(u8, event_type)
+		__field(u16, hostid)
+		__field(u8, region_id)
+		__field(u64, dpa_start)
+		__field(u64, length)
+		__array(u8, tag, CXL_DC_EXTENT_TAG_LEN)
+		__field(u16, sh_extent_seq)
+	),
+
+	TP_fast_assign(
+		CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+
+		/* Dynamic_capacity Event */
+		__entry->event_type = rec->data.event_type;
+
+		/* DCD event record data */
+		__entry->hostid = le16_to_cpu(rec->data.host_id);
+		__entry->region_id = rec->data.region_index;
+		__entry->dpa_start = le64_to_cpu(rec->data.extent.start_dpa);
+		__entry->length = le64_to_cpu(rec->data.extent.length);
+		memcpy(__entry->tag, &rec->data.extent.tag, CXL_DC_EXTENT_TAG_LEN);
+		__entry->sh_extent_seq = le16_to_cpu(rec->data.extent.shared_extn_seq);
+	),
+
+	CXL_EVT_TP_printk("event_type='%s' host_id='%d' region_id='%d' " \
+		"starting_dpa=%llx length=%llx tag=%s " \
+		"shared_extent_sequence=%d",
+		show_dc_evt_type(__entry->event_type),
+		__entry->hostid,
+		__entry->region_id,
+		__entry->dpa_start,
+		__entry->length,
+		__print_hex(__entry->tag, CXL_DC_EXTENT_TAG_LEN),
+		__entry->sh_extent_seq
+	)
+);
+
 #endif /* _CXL_EVENTS_H */
 
 #define TRACE_INCLUDE_FILE trace

-- 
2.41.0