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

CXL rev 3.1 section 8.2.9.2.1 adds the Dynamic Capacity Event Records.
User space can use trace events for debugging of DC capacity changes.

Add DC trace points to the trace log.

Signed-off-by: Navneet Singh <navneet.singh@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Co-developed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 drivers/cxl/core/mbox.c  |  4 +++
 drivers/cxl/core/trace.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 4d476f149c82c0b6ee61cf7f4e71b206cf19ac7f..c2c641e172a1094c7c129ae11ce1ad6692fbad25 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -995,6 +995,10 @@ static void __cxl_event_trace_record(const struct cxl_memdev *cxlmd,
 		ev_type = CXL_CPER_EVENT_DRAM;
 	else if (uuid_equal(uuid, &CXL_EVENT_MEM_MODULE_UUID))
 		ev_type = CXL_CPER_EVENT_MEM_MODULE;
+	else if (uuid_equal(uuid, &CXL_EVENT_DC_EVENT_UUID)) {
+		trace_cxl_dynamic_capacity(cxlmd, type, &record->event.dcd);
+		return;
+	}
 
 	cxl_event_trace_record(cxlmd, type, ev_type, uuid, &record->event);
 }
diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index 8672b42ee4d1b376063b09d29922fcce83a70168..d4526f06cf2a2d0a4b4bc5f9e00238aa43a16e35 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -731,6 +731,71 @@ TRACE_EVENT(cxl_poison,
 	)
 );
 
+/*
+ * Dynamic Capacity Event Record - DER
+ *
+ * CXL rev 3.1 section 8.2.9.2.1.6 Table 8-50
+ */
+
+#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 cxl_event_dcd *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_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->event_type;
+
+		/* DCD event record data */
+		__entry->hostid = le16_to_cpu(rec->host_id);
+		__entry->region_id = rec->region_index;
+		__entry->dpa_start = le64_to_cpu(rec->extent.start_dpa);
+		__entry->length = le64_to_cpu(rec->extent.length);
+		memcpy(__entry->tag, &rec->extent.tag, CXL_EXTENT_TAG_LEN);
+		__entry->sh_extent_seq = le16_to_cpu(rec->extent.shared_extn_seq);
+	),
+
+	CXL_EVT_TP_printk("event_type='%s' host_id='%d' region_id='%d' " \
+		"starting_dpa=%llx length=%llx tag=%pU " \
+		"shared_extent_sequence=%d",
+		show_dc_evt_type(__entry->event_type),
+		__entry->hostid,
+		__entry->region_id,
+		__entry->dpa_start,
+		__entry->length,
+		__entry->tag,
+		__entry->sh_extent_seq
+	)
+);
+
 #endif /* _CXL_EVENTS_H */
 
 #define TRACE_INCLUDE_FILE trace

-- 
2.47.0