[ndctl patch RFC 1/2] libcxl: add accessors for IDENTIFY command

[Jehoon Park <jehoon.park@samsung.com>]

From: jehoon park <jehoon.park@samsung.com>

Add accessors to retrieve event log size, poison list size,
inject poison limit, poison handling capabilities and QoS
telemetry capabilities from output payload of IDENTIFY command.

Signed-off-by: jehoon park <jehoon.park@samsung.com>
---
 cxl/lib/libcxl.c   | 73 ++++++++++++++++++++++++++++++++++++++++++++++
 cxl/lib/libcxl.sym | 11 +++++++
 cxl/lib/private.h  | 11 +++++++
 cxl/libcxl.h       | 16 ++++++++++
 4 files changed, 111 insertions(+)

diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 59e5bdb..12d8e63 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -3775,6 +3775,79 @@ cxl_cmd_identify_get_persistent_only_size(struct cxl_cmd *cmd)
 	return cxl_capacity_to_bytes(c->persistent_capacity);
 }
 
+CXL_EXPORT int
+cxl_cmd_identify_get_event_log_size(struct cxl_cmd *cmd,
+				    enum cxl_identify_event event)
+{
+	struct cxl_cmd_identify *id =
+		(struct cxl_cmd_identify *)cmd->send_cmd->out.payload;
+	int rc = cxl_cmd_validate_status(cmd, CXL_MEM_COMMAND_ID_IDENTIFY);
+	if (rc)
+		return rc;
+
+	switch (event) {
+	case CXL_IDENTIFY_INFO:
+		return le16_to_cpu(id->info_event_log_size);
+	case CXL_IDENTIFY_WARN:
+		return le16_to_cpu(id->warning_event_log_size);
+	case CXL_IDENTIFY_FAIL:
+		return le16_to_cpu(id->failure_event_log_size);
+	case CXL_IDENTIFY_FATAL:
+		return le16_to_cpu(id->fatal_event_log_size);
+	default:
+		return -EINVAL;
+	}
+}
+
+CXL_EXPORT int cxl_cmd_identify_get_poison_list_max(struct cxl_cmd *cmd)
+{
+	unsigned int max_records = 0;
+	struct cxl_cmd_identify *id =
+		(struct cxl_cmd_identify *)cmd->send_cmd->out.payload;
+	int rc = cxl_cmd_validate_status(cmd, CXL_MEM_COMMAND_ID_IDENTIFY);
+	if (rc)
+		return rc;
+
+	for (int i = 0; i < 3; i++)
+		max_records += id->poison_list_max_mer[i] << (8 * i);
+
+	return max_records;
+}
+
+CXL_EXPORT int cxl_cmd_identify_get_inject_poison_limit(struct cxl_cmd *cmd)
+{
+	cmd_get_field_u16(cmd, identify, IDENTIFY, inject_poison_limit);
+}
+
+CXL_EXPORT int cxl_cmd_identify_injects_persistent_poison(struct cxl_cmd *cmd)
+{
+	cmd_get_field_u8_mask(
+		cmd, identify, IDENTIFY, poison_caps,
+		CXL_CMD_IDENTIFY_POISON_HANDLING_CAPABILITIES_INJECTS_PERSISTENT_POISON);
+}
+
+CXL_EXPORT int cxl_cmd_identify_scans_for_poison(struct cxl_cmd *cmd)
+{
+	cmd_get_field_u8_mask(
+		cmd, identify, IDENTIFY, poison_caps,
+		CXL_CMD_IDENTIFY_POISON_HANDLING_CAPABILITIES_SCANS_FOR_POISON);
+}
+
+CXL_EXPORT int cxl_cmd_identify_egress_port_congestion(struct cxl_cmd *cmd)
+{
+	cmd_get_field_u8_mask(
+		cmd, identify, IDENTIFY, qos_telemetry_caps,
+		CXL_CMD_IDENTIFY_QOS_TELEMETRY_CAPABILITIES_EGRESS_PORT_CONGESTION);
+}
+
+CXL_EXPORT int
+cxl_cmd_identify_temporary_throughput_reduction(struct cxl_cmd *cmd)
+{
+	cmd_get_field_u8_mask(
+		cmd, identify, IDENTIFY, qos_telemetry_caps,
+		CXL_CMD_IDENTIFY_QOS_TELEMETRY_CAPABILITIES_TEMPORARY_THROUGHPUT_REDUCTION);
+}
+
 CXL_EXPORT struct cxl_cmd *cxl_cmd_new_raw(struct cxl_memdev *memdev,
 		int opcode)
 {
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 1c6177c..2bd209e 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -249,3 +249,14 @@ global:
 	cxl_decoder_create_ram_region;
 	cxl_region_get_daxctl_region;
 } LIBCXL_4;
+
+LIBCXL_6 {
+global:
+	cxl_cmd_identify_get_event_log_size;
+	cxl_cmd_identify_get_poison_list_max;
+	cxl_cmd_identify_get_inject_poison_limit;
+	cxl_cmd_identify_injects_persistent_poison;
+	cxl_cmd_identify_scans_for_poison;
+	cxl_cmd_identify_egress_port_congestion;
+	cxl_cmd_identify_temporary_throughput_reduction;
+} LIBCXL_5;
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index d648992..aab1552 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -211,6 +211,17 @@ struct cxl_cmd_identify {
 	u8 qos_telemetry_caps;
 } __attribute__((packed));
 
+/* CXL 3.0 8.2.9.8.1.1 Identify Memory Device Poison Handling Capabilities */
+#define CXL_CMD_IDENTIFY_POISON_HANDLING_CAPABILITIES_INJECTS_PERSISTENT_POISON \
+	BIT(0)
+#define CXL_CMD_IDENTIFY_POISON_HANDLING_CAPABILITIES_SCANS_FOR_POISON BIT(1)
+
+/* CXL 3.0 8.2.9.8.1.1 Identify Memory Device QoS Telemetry Capabilities */
+#define CXL_CMD_IDENTIFY_QOS_TELEMETRY_CAPABILITIES_EGRESS_PORT_CONGESTION \
+	BIT(0)
+#define CXL_CMD_IDENTIFY_QOS_TELEMETRY_CAPABILITIES_TEMPORARY_THROUGHPUT_REDUCTION \
+	BIT(1)
+
 struct cxl_cmd_get_lsa_in {
 	le32 offset;
 	le32 length;
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index 54d9f10..1856bee 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -334,6 +334,22 @@ unsigned long long cxl_cmd_identify_get_volatile_only_size(struct cxl_cmd *cmd);
 unsigned long long cxl_cmd_identify_get_persistent_only_size(struct cxl_cmd *cmd);
 unsigned long long cxl_cmd_identify_get_partition_align(struct cxl_cmd *cmd);
 unsigned int cxl_cmd_identify_get_label_size(struct cxl_cmd *cmd);
+
+enum cxl_identify_event {
+	CXL_IDENTIFY_INFO,
+	CXL_IDENTIFY_WARN,
+	CXL_IDENTIFY_FAIL,
+	CXL_IDENTIFY_FATAL,
+};
+
+int cxl_cmd_identify_get_event_log_size(struct cxl_cmd *cmd,
+					enum cxl_identify_event event);
+int cxl_cmd_identify_get_poison_list_max(struct cxl_cmd *cmd);
+int cxl_cmd_identify_get_inject_poison_limit(struct cxl_cmd *cmd);
+int cxl_cmd_identify_injects_persistent_poison(struct cxl_cmd *cmd);
+int cxl_cmd_identify_scans_for_poison(struct cxl_cmd *cmd);
+int cxl_cmd_identify_egress_port_congestion(struct cxl_cmd *cmd);
+int cxl_cmd_identify_temporary_throughput_reduction(struct cxl_cmd *cmd);
 struct cxl_cmd *cxl_cmd_new_get_health_info(struct cxl_memdev *memdev);
 int cxl_cmd_health_info_get_maintenance_needed(struct cxl_cmd *cmd);
 int cxl_cmd_health_info_get_performance_degraded(struct cxl_cmd *cmd);
-- 
2.17.1