BH: Expose non-hwmon telemetry in sysfs

- Augment telemetry discovery to support board id, some FW versions, and
  SOC clock speeds.
- Partially integrate with existing mechanism for exposing non-hwmon
  metrics in sysfs, but provide Blackhole-specific "show"
  implementations.

blackhole.c

@@ -31,10 +31,16 @@
 #define ARC_TELEMETRY_DATA RESET_SCRATCH(12)
 
 // These are from ARC FW telemetry.h, guaranteed not to change
+#define TELEMETRY_BOARD_ID 1
 #define TELEMETRY_VCORE 6
 #define TELEMETRY_POWER 7
 #define TELEMETRY_CURRENT 8
 #define TELEMETRY_ASIC_TEMP 11
+#define TELEMETRY_AICLK 14
+#define TELEMETRY_AXICLK 15
+#define TELEMETRY_ARCCLK 16
+#define TELEMETRY_BM_APP_FW_VERSION 26
+#define TELEMETRY_FLASH_BUNDLE_VERSION 28
 
 struct TLB_2M_REG {
 	union {
@@ -120,6 +126,74 @@ static struct blackhole_hwmon_attr bh_hwmon_attrs[] = {
 	{ TELEMETRY_POWER,     hwmon_power, hwmon_power_input, 0x0 },
 };
 
+static ssize_t bh_show_attribute(struct device *dev, struct device_attribute *attr, char *buf) {
+	struct tenstorrent_device *tt_dev = dev_get_drvdata(dev);
+	struct blackhole_device *bh = tt_dev_to_bh_dev(tt_dev);
+	struct tt_attribute_data *data = container_of(attr, struct tt_attribute_data, attr);
+	u32 addr = data->reg_offset;
+	u32 value = 0;
+
+	if (addr != 0)
+		value = noc_read32(bh, ARC_X, ARC_Y, addr);
+
+	return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t bh_show_card_serial(struct device *dev, struct device_attribute *attr, char *buf) {
+	struct tenstorrent_device *tt_dev = dev_get_drvdata(dev);
+	struct blackhole_device *bh = tt_dev_to_bh_dev(tt_dev);
+	struct tt_attribute_data *data = container_of(attr, struct tt_attribute_data, attr);
+	u32 addr = data->reg_offset;
+	u32 board_id_hi = 0;
+	u32 board_id_lo = 0;
+
+	if (addr != 0) {
+		board_id_hi = noc_read32(bh, ARC_X, ARC_Y, addr + 0);
+		board_id_lo = noc_read32(bh, ARC_X, ARC_Y, addr + 4);
+	}
+	return scnprintf(buf, PAGE_SIZE, "%08X%08X\n", board_id_hi, board_id_lo);
+}
+
+static ssize_t bh_show_fw_ver(struct device *dev, struct device_attribute *attr, char *buf) {
+	struct tenstorrent_device *tt_dev = dev_get_drvdata(dev);
+	struct tt_attribute_data *data = container_of(attr, struct tt_attribute_data, attr);
+	struct blackhole_device *bh = tt_dev_to_bh_dev(tt_dev);
+	u32 addr = data->reg_offset;
+	u32 fw_ver = 0;
+	u32 major, minor, patch, ver;
+
+	if (addr != 0)
+		fw_ver = noc_read32(bh, ARC_X, ARC_Y, addr);
+
+	major = (fw_ver >> 24) & 0xFF;
+	minor = (fw_ver >> 16) & 0xFF;
+	patch = (fw_ver >>  8) & 0xFF;
+	ver = fw_ver & 0xFF;
+	return scnprintf(buf, PAGE_SIZE, "%u.%u.%u.%u\n", major, minor, patch, ver);
+}
+
+// Addresses are set by telemetry_probe
+static struct tt_attribute_data bh_attributes[] = {
+	{ __ATTR(tt_aiclk,  S_IRUGO, bh_show_attribute, NULL) },
+	{ __ATTR(tt_axiclk, S_IRUGO, bh_show_attribute, NULL) },
+	{ __ATTR(tt_arcclk, S_IRUGO, bh_show_attribute, NULL) },
+	{ __ATTR(tt_serial, S_IRUGO, bh_show_card_serial, NULL) },
+	{ __ATTR(tt_m3app_fw_ver, S_IRUGO, bh_show_fw_ver, NULL) },
+	{ __ATTR(tt_fw_bundle_ver, S_IRUGO, bh_show_fw_ver, NULL) },
+	{ __ATTR_NULL }
+};
+
+// Must match bh_attributes array
+static int bh_attributes_ids[] = {
+	TELEMETRY_AICLK,
+	TELEMETRY_AXICLK,
+	TELEMETRY_ARCCLK,
+	TELEMETRY_BOARD_ID,
+	TELEMETRY_BM_APP_FW_VERSION,
+	TELEMETRY_FLASH_BUNDLE_VERSION,
+	-1,
+};
+
 static umode_t bh_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) {
 	int i;
 
@@ -218,20 +292,30 @@ static int telemetry_probe(struct tenstorrent_device *tt_dev) {
 		u16 offset = (tag_entry >> 16) & 0xFFFF;
 		u32 addr = data_addr + (offset * 4);
 
-		// Check if this tag is one hwmon cares about
+		// First, check if this tag is one hwmon cares about
 		for (j = 0; j < ARRAY_SIZE(bh_hwmon_attrs); ++j) {
 			if (bh_hwmon_attrs[j].tag_id == tag_id) {
 				bh_hwmon_attrs[j].addr = addr;
 				break;
 			}
 		}
+
+		// Check if it's a device attribute we will expose in sysfs
+		for (j = 0; j < ARRAY_SIZE(bh_attributes_ids); ++j) {
+			if (bh_attributes_ids[j] == tag_id) {
+				bh_attributes[j].reg_offset = addr;
+				break;
+			}
+		}
 	}
 
 	hwmon_device = devm_hwmon_device_register_with_info(&bh->tt.pdev->dev, "blackhole", bh, &bh_hwmon_chip_info, NULL);
 
 	if (IS_ERR(hwmon_device))
 		return PTR_ERR(hwmon_device);
 
+	tt_dev->attributes = bh_attributes;
+
 	return 0;
 }