linux-kernel - [PATCH 05/13] rasdaemon: cxl: Add Component Identifier formatting for CXL spec rev 3.1

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Message-ID: <20241120095923.1891-6-shiju.jose@huawei.com>
Date: Wed, 20 Nov 2024 09:59:15 +0000
From: <shiju.jose@...wei.com>
To: <linux-edac@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
	<mchehab@...nel.org>, <dave.jiang@...el.com>, <dan.j.williams@...el.com>,
	<jonathan.cameron@...wei.com>, <alison.schofield@...el.com>,
	<nifan.cxl@...il.com>, <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
	<dave@...olabs.net>
CC: <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<tanxiaofei@...wei.com>, <prime.zeng@...ilicon.com>, <shiju.jose@...wei.com>
Subject: [PATCH 05/13] rasdaemon: cxl: Add Component Identifier formatting for CXL spec rev 3.1

From: Shiju Jose <shiju.jose@...wei.com>

Add Component Identifier formatting for CXL spec rev 3.1, Section
8.2.9.2.1, Table 8-44.

Add helper function to print component ID, parse and log PLDM entity ID
and resource ID.

Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
---
 ras-cxl-handler.c | 41 +++++++++++++++++++++++++++++++++++++++++
 ras-record.h      |  3 +++
 2 files changed, 44 insertions(+)

diff --git a/ras-cxl-handler.c b/ras-cxl-handler.c
index d16eaef..80afa9f 100644
--- a/ras-cxl-handler.c
+++ b/ras-cxl-handler.c
@@ -573,6 +573,47 @@ int ras_cxl_overflow_event_handler(struct trace_seq *s,
 	return 0;
 }
 
+/*
+ * Component ID Format
+ * CXL 3.1 section 8.2.9.2.1; Table 8-44
+ */
+#define CXL_PLDM_COMPONENT_ID_ENTITY_VALID	BIT(0)
+#define CXL_PLDM_COMPONENT_ID_RES_VALID		BIT(1)
+static const struct  cxl_event_flags cxl_pldm_comp_id_flags[] = {
+	{ .bit = CXL_PLDM_COMPONENT_ID_ENTITY_VALID, .flag = "PLDM Entity ID" },
+	{ .bit = CXL_PLDM_COMPONENT_ID_RES_VALID, .flag = "Resource ID" },
+};
+
+static int ras_cxl_print_component_id(struct trace_seq *s, uint8_t *comp_id,
+				      uint8_t *entity_id, uint8_t *res_id)
+{
+	int i;
+
+	if (comp_id[0] & CXL_PLDM_COMPONENT_ID_ENTITY_VALID) {
+		if (trace_seq_printf(s, "PLDM Entity ID:") <= 0)
+			return -1;
+		for (i = 1; i < 7; i++) {
+			if (trace_seq_printf(s, "%02x ", comp_id[i]) <= 0)
+				return -1;
+		}
+		if (entity_id)
+			memcpy(entity_id, &comp_id[1], CXL_PLDM_ENTITY_ID_LEN);
+	}
+
+	if (comp_id[0] & CXL_PLDM_COMPONENT_ID_RES_VALID) {
+		if (trace_seq_printf(s, "Resource ID:") <= 0)
+			return -1;
+		for (i = 7; i < 11; i++) {
+			if (trace_seq_printf(s, "%02x ", comp_id[i]) <= 0)
+				return -1;
+		}
+		if (res_id)
+			memcpy(res_id, &comp_id[7], CXL_PLDM_RES_ID_LEN);
+	}
+
+	return 0;
+}
+
 /*
  * Common Event Record Format
  * CXL 3.1 section 8.2.9.2.1; Table 8-43
diff --git a/ras-record.h b/ras-record.h
index 2a0124a..a3a88eb 100644
--- a/ras-record.h
+++ b/ras-record.h
@@ -137,6 +137,9 @@ struct ras_cxl_poison_event {
 #define CXL_EVENT_GEN_MED_COMP_ID_SIZE	0x10
 #define CXL_EVENT_DER_CORRECTION_MASK_SIZE	0x20
 
+#define CXL_PLDM_ENTITY_ID_LEN	6
+#define CXL_PLDM_RES_ID_LEN	4
+
 struct ras_cxl_aer_ue_event {
 	char timestamp[64];
 	const char *memdev;
-- 
2.43.0