scsi: ufs: sysfs: health descriptor

This patch introduces a sysfs group entry for the UFS health descriptor
parameters. The group adds "health_descriptor" folder under the UFS driver
sysfs entry (/sys/bus/platform/drivers/ufshcd/*). The parameters are shown
as hexadecimal numbers. The full information about the parameters could be
found at UFS specifications 2.1.

Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

4 files changed, 40 insertions, 0 deletions

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index ecd3dcb05f67..c4f18b0970db 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -349,11 +349,31 @@ static const struct attribute_group ufs_sysfs_geometry_descriptor_group = {
 	.attrs = ufs_sysfs_geometry_descriptor,
 };
 
+#define UFS_HEALTH_DESC_PARAM(_name, _uname, _size)			\
+	UFS_DESC_PARAM(_name, _uname, HEALTH, _size)
+
+UFS_HEALTH_DESC_PARAM(eol_info, _EOL_INFO, 1);
+UFS_HEALTH_DESC_PARAM(life_time_estimation_a, _LIFE_TIME_EST_A, 1);
+UFS_HEALTH_DESC_PARAM(life_time_estimation_b, _LIFE_TIME_EST_B, 1);
+
+static struct attribute *ufs_sysfs_health_descriptor[] = {
+	&dev_attr_eol_info.attr,
+	&dev_attr_life_time_estimation_a.attr,
+	&dev_attr_life_time_estimation_b.attr,
+	NULL,
+};
+
+static const struct attribute_group ufs_sysfs_health_descriptor_group = {
+	.name = "health_descriptor",
+	.attrs = ufs_sysfs_health_descriptor,
+};
+
 static const struct attribute_group *ufs_sysfs_groups[] = {
 	&ufs_sysfs_default_group,
 	&ufs_sysfs_device_descriptor_group,
 	&ufs_sysfs_interconnect_descriptor_group,
 	&ufs_sysfs_geometry_descriptor_group,
+	&ufs_sysfs_health_descriptor_group,
 	NULL,
 };
 
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 04d41c8d3dc1..6bfeedb934f1 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*/
@@ -274,6 +276,15 @@ enum geometry_desc_param {
 	GEOMETRY_DESC_PARAM_OPT_LOG_BLK_SIZE	= 0x44,
 };
 
+/* Health descriptor parameters offsets in bytes*/
+enum health_desc_param {
+	HEALTH_DESC_PARAM_LEN			= 0x0,
+	HEALTH_DESC_PARAM_TYPE			= 0x1,
+	HEALTH_DESC_PARAM_EOL_INFO		= 0x2,
+	HEALTH_DESC_PARAM_LIFE_TIME_EST_A	= 0x3,
+	HEALTH_DESC_PARAM_LIFE_TIME_EST_B	= 0x4,
+};
+
 /*
  * Logical Unit Write Protect
  * 00h: LU not write protected
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 540a431e38ce..b88fcf7be47b 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2966,6 +2966,9 @@ int ufshcd_map_desc_id_to_length(struct ufs_hba *hba,
 	case QUERY_DESC_IDN_STRING:
 		*desc_len = QUERY_DESC_MAX_SIZE;
 		break;
+	case QUERY_DESC_IDN_HEALTH:
+		*desc_len = hba->desc_size.hlth_desc;
+		break;
 	case QUERY_DESC_IDN_RFU_0:
 	case QUERY_DESC_IDN_RFU_1:
 		*desc_len = 0;
@@ -6277,6 +6280,10 @@ 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.hlth_desc);
+	if (err)
+		hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
 }
 
 static void ufshcd_def_desc_sizes(struct ufs_hba *hba)
@@ -6287,6 +6294,7 @@ 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.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
 }
 
 /**
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 38c307d053c7..515c6e6244be 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 hlth_desc;
 };
 
 /**