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Subject[PATCH 2/2] scsi: ufs: use sysfs entry for health info
Date
From: Jaegeuk Kim <jaegeuk@google.com>

This patch introduces sysfs entries to show the information.

# cat /sys/devices/soc/1da4000.ufshc/health/eol
# cat /sys/devices/soc/1da4000.ufshc/health/length
# cat /sys/devices/soc/1da4000.ufshc/health/lifetimeA
# cat /sys/devices/soc/1da4000.ufshc/health/lifetimeB
# cat /sys/devices/soc/1da4000.ufshc/health/type

struct desc_field_offset health_desc_field_name[] = {
{"bLength", 0x00, BYTE},
{"bDescriptorType", 0x01, BYTE},
{"bPreEOLInfo", 0x02, BYTE},
{"bDeviceLifeTimeEstA", 0x03, BYTE},
{"bDeviceLifeTimeEstB", 0x04, BYTE}
};

bPreEOLInfo
- 00h: Not defined
- 01h: Normal
- 02h: Warning
- 03h: Critical

bDeviceLifeTimeEstA
- 00h: Not defined
- 01h: 0% ~ 10% device life time used
- 02h: 10% ~ 20% device life time used
- 03h: 20% ~ 30% device life time used
- 04h: 30% ~ 40% device life time used
- 05h: 40% ~ 50% device life time used
- 06h: 50% ~ 60% device life time used
- 07h: 60% ~ 70% device life time used
- 08h: 70% ~ 80% device life time used
- 09h: 80% ~ 90% device life time used
- 0Ah: 90% ~ 100% device life time used
- 0Bh: Exceeded its maximum estimated device life time

Cc: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
---
drivers/scsi/ufs/ufs.h | 2 ++
drivers/scsi/ufs/ufshcd.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++-
drivers/scsi/ufs/ufshcd.h | 1 +
3 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 54deeb754db5..1af541d56c7d 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -154,6 +154,7 @@ enum desc_idn {
QUERY_DESC_IDN_RFU_1 = 0x6,
QUERY_DESC_IDN_GEOMETRY = 0x7,
QUERY_DESC_IDN_POWER = 0x8,
+ QUERY_DESC_IDN_HEALTH = 0x9,
QUERY_DESC_IDN_MAX,
};

@@ -169,6 +170,7 @@ enum ufs_desc_def_size {
QUERY_DESC_INTERCONNECT_DEF_SIZE = 0x06,
QUERY_DESC_GEOMETRY_DEF_SIZE = 0x44,
QUERY_DESC_POWER_DEF_SIZE = 0x62,
+ QUERY_DESC_HEALTH_DEF_SIZE = 0x25,
};

/* Unit descriptor parameters offsets in bytes*/
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 12ff7daebb00..6809f1786efe 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2991,6 +2991,9 @@ int ufshcd_map_desc_id_to_length(struct ufs_hba *hba,
case QUERY_DESC_IDN_RFU_1:
*desc_len = 0;
break;
+ case QUERY_DESC_IDN_HEALTH:
+ *desc_len = hba->desc_size.health_desc;
+ break;
default:
*desc_len = 0;
return -EINVAL;
@@ -6298,6 +6301,11 @@ static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
&hba->desc_size.geom_desc);
if (err)
hba->desc_size.geom_desc = QUERY_DESC_GEOMETRY_DEF_SIZE;
+
+ err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_HEALTH, 0,
+ &hba->desc_size.health_desc);
+ if (err)
+ hba->desc_size.health_desc = QUERY_DESC_HEALTH_DEF_SIZE;
}

static void ufshcd_def_desc_sizes(struct ufs_hba *hba)
@@ -6308,6 +6316,7 @@ static void ufshcd_def_desc_sizes(struct ufs_hba *hba)
hba->desc_size.conf_desc = QUERY_DESC_CONFIGURATION_DEF_SIZE;
hba->desc_size.unit_desc = QUERY_DESC_UNIT_DEF_SIZE;
hba->desc_size.geom_desc = QUERY_DESC_GEOMETRY_DEF_SIZE;
+ hba->desc_size.health_desc = QUERY_DESC_HEALTH_DEF_SIZE;
}

/**
@@ -7688,14 +7697,69 @@ static const struct attribute_group ufshcd_attr_group = {
.attrs = ufshcd_attrs,
};

+struct health_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct device *dev,
+ struct health_attr *attr, char *buf);
+ int bytes;
+};
+
+static ssize_t health_attr_show(struct device *dev,
+ struct health_attr *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ int buff_len = hba->desc_size.health_desc;
+ u8 desc_buf[hba->desc_size.health_desc];
+ int err;
+
+ pm_runtime_get_sync(hba->dev);
+ err = ufshcd_read_desc(hba, QUERY_DESC_IDN_HEALTH, 0,
+ desc_buf, buff_len);
+ pm_runtime_put_sync(hba->dev);
+ if (err)
+ return 0;
+
+ return scnprintf(buf, PAGE_SIZE, "0x%02x", desc_buf[attr->bytes]);
+}
+
+#define HEALTH_ATTR_RO(_name, _bytes) \
+static struct health_attr ufs_health_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = 0444}, \
+ .show = health_attr_show, \
+ .bytes = _bytes, \
+}
+
+HEALTH_ATTR_RO(length, 0);
+HEALTH_ATTR_RO(type, 1);
+HEALTH_ATTR_RO(eol, 2);
+HEALTH_ATTR_RO(lifetimeA, 3);
+HEALTH_ATTR_RO(lifetimeB, 4);
+
+static struct attribute *ufshcd_health_attrs[] = {
+ &ufs_health_length.attr,
+ &ufs_health_type.attr,
+ &ufs_health_eol.attr,
+ &ufs_health_lifetimeA.attr,
+ &ufs_health_lifetimeB.attr,
+ NULL
+};
+
+static const struct attribute_group ufshcd_health_attr_group = {
+ .name = "health",
+ .attrs = ufshcd_health_attrs,
+};
+
static inline void ufshcd_add_sysfs_nodes(struct ufs_hba *hba)
{
if (sysfs_create_group(&hba->dev->kobj, &ufshcd_attr_group))
- dev_err(hba->dev, "Failed to create sysfs group\n");
+ dev_err(hba->dev, "Failed to create default sysfs group\n");
+ if (sysfs_create_group(&hba->dev->kobj, &ufshcd_health_attr_group))
+ dev_err(hba->dev, "Failed to create health sysfs group\n");
}

static inline void ufshcd_remove_sysfs_nodes(struct ufs_hba *hba)
{
+ sysfs_remove_group(&hba->dev->kobj, &ufshcd_health_attr_group);
sysfs_remove_group(&hba->dev->kobj, &ufshcd_attr_group);
}

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 56e26eb15185..ba44cbcf755e 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -229,6 +229,7 @@ struct ufs_desc_size {
int interc_desc;
int unit_desc;
int conf_desc;
+ int health_desc;
};

/**
--
2.15.0.531.g2ccb3012c9-goog
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