[PATCH v2 2/2] misc: smpro-errmon: Add dimm training failure syndrome

[Quan Nguyen <quan@os.amperecomputing.com>]

Adds event_dimm[0-15]_syndrome sysfs to report the failure syndrome
to BMC when DIMM training failed.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
---
v2:
  + Change "to initialized" to "to initialize"            [Paul]
  + Corrected kernel version to 6.3                  [Greg,Paul]
  + Corrected variables type to 'unsigned int"            [Paul]
---
 .../sysfs-bus-platform-devices-ampere-smpro   | 10 +++
 drivers/misc/smpro-errmon.c                   | 77 +++++++++++++++++++
 2 files changed, 87 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro b/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
index 5a8d1af49a2b..44101d3fed22 100644
--- a/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
+++ b/Documentation/ABI/testing/sysfs-bus-platform-devices-ampere-smpro
@@ -265,6 +265,16 @@ Description:
 		For more details, see section `5.7 GPI Status Registers and 5.9 Memory Error Register Definitions,
 		Altra Family Soc BMC Interface Specification`.
 
+What:		/sys/bus/platform/devices/smpro-errmon.*/event_dimm[0-15]_syndrome
+KernelVersion:	6.3
+Contact:	Quan Nguyen <quan@os.amperecomputing.com>
+Description:
+		(RO) The sysfs returns the 2-byte DIMM failure syndrome data for slot
+		0-15 if it failed to initialize.
+
+		For more details, see section `5.11 Boot Stage Register Definitions,
+		Altra Family Soc BMC Interface Specification`.
+
 What:		/sys/bus/platform/devices/smpro-misc.*/boot_progress
 KernelVersion:	6.1
 Contact:	Quan Nguyen <quan@os.amperecomputing.com>
diff --git a/drivers/misc/smpro-errmon.c b/drivers/misc/smpro-errmon.c
index 1635e881aefb..a1f0b2c77fac 100644
--- a/drivers/misc/smpro-errmon.c
+++ b/drivers/misc/smpro-errmon.c
@@ -47,6 +47,12 @@
 #define WARN_PMPRO_INFO_LO	0xAC
 #define WARN_PMPRO_INFO_HI	0xAD
 
+/* Boot Stage Register */
+#define BOOTSTAGE		0xB0
+#define DIMM_SYNDROME_SEL	0xB4
+#define DIMM_SYNDROME_ERR	0xB5
+#define DIMM_SYNDROME_STAGE	4
+
 /* PCIE Error Registers */
 #define PCIE_CE_ERR_CNT		0xC0
 #define PCIE_CE_ERR_LEN		0xC1
@@ -468,6 +474,61 @@ EVENT_RO(vrd_hot, VRD_HOT_EVENT);
 EVENT_RO(dimm_hot, DIMM_HOT_EVENT);
 EVENT_RO(dimm_2x_refresh, DIMM_2X_REFRESH_EVENT);
 
+static ssize_t smpro_dimm_syndrome_read(struct device *dev, struct device_attribute *da,
+					char *buf, unsigned int slot)
+{
+	struct smpro_errmon *errmon = dev_get_drvdata(dev);
+	unsigned int data;
+	int ret;
+
+	ret = regmap_read(errmon->regmap, BOOTSTAGE, &data);
+	if (ret)
+		return ret;
+
+	/* check for valid stage */
+	data = (data >> 8) & 0xff;
+	if (data != DIMM_SYNDROME_STAGE)
+		return ret;
+
+	/* Write the slot ID to retrieve Error Syndrome */
+	ret = regmap_write(errmon->regmap, DIMM_SYNDROME_SEL, slot);
+	if (ret)
+		return ret;
+
+	/* Read the Syndrome error */
+	ret = regmap_read(errmon->regmap, DIMM_SYNDROME_ERR, &data);
+	if (ret || !data)
+		return ret;
+
+	return sysfs_emit(buf, "%04x\n", data);
+}
+
+#define EVENT_DIMM_SYNDROME(_slot) \
+	static ssize_t event_dimm##_slot##_syndrome_show(struct device *dev,          \
+							 struct device_attribute *da, \
+							 char *buf)                   \
+	{                                                                             \
+		return smpro_dimm_syndrome_read(dev, da, buf, _slot);                 \
+	}                                                                             \
+	static DEVICE_ATTR_RO(event_dimm##_slot##_syndrome)
+
+EVENT_DIMM_SYNDROME(0);
+EVENT_DIMM_SYNDROME(1);
+EVENT_DIMM_SYNDROME(2);
+EVENT_DIMM_SYNDROME(3);
+EVENT_DIMM_SYNDROME(4);
+EVENT_DIMM_SYNDROME(5);
+EVENT_DIMM_SYNDROME(6);
+EVENT_DIMM_SYNDROME(7);
+EVENT_DIMM_SYNDROME(8);
+EVENT_DIMM_SYNDROME(9);
+EVENT_DIMM_SYNDROME(10);
+EVENT_DIMM_SYNDROME(11);
+EVENT_DIMM_SYNDROME(12);
+EVENT_DIMM_SYNDROME(13);
+EVENT_DIMM_SYNDROME(14);
+EVENT_DIMM_SYNDROME(15);
+
 static struct attribute *smpro_errmon_attrs[] = {
 	&dev_attr_overflow_core_ce.attr,
 	&dev_attr_overflow_core_ue.attr,
@@ -493,6 +554,22 @@ static struct attribute *smpro_errmon_attrs[] = {
 	&dev_attr_event_vrd_hot.attr,
 	&dev_attr_event_dimm_hot.attr,
 	&dev_attr_event_dimm_2x_refresh.attr,
+	&dev_attr_event_dimm0_syndrome.attr,
+	&dev_attr_event_dimm1_syndrome.attr,
+	&dev_attr_event_dimm2_syndrome.attr,
+	&dev_attr_event_dimm3_syndrome.attr,
+	&dev_attr_event_dimm4_syndrome.attr,
+	&dev_attr_event_dimm5_syndrome.attr,
+	&dev_attr_event_dimm6_syndrome.attr,
+	&dev_attr_event_dimm7_syndrome.attr,
+	&dev_attr_event_dimm8_syndrome.attr,
+	&dev_attr_event_dimm9_syndrome.attr,
+	&dev_attr_event_dimm10_syndrome.attr,
+	&dev_attr_event_dimm11_syndrome.attr,
+	&dev_attr_event_dimm12_syndrome.attr,
+	&dev_attr_event_dimm13_syndrome.attr,
+	&dev_attr_event_dimm14_syndrome.attr,
+	&dev_attr_event_dimm15_syndrome.attr,
 	NULL
 };
 
-- 
2.35.1