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scsi: ufs: sysfs: unit descriptor 

This patch introduces a sysfs group entry for the UFS unit descriptor
parameters. The group adds "unit_descriptor" folder under the corresponding
SCSI device sysfs entry (/sys/class/scsi_device/*/device/). 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>
This commit is contained in:
Stanislav Nijnikov 2018-02-15 14:14:09 +02:00 коммит произвёл Martin K. Petersen
Родитель 86b87cde0b
Коммит d829fc8a10
6 изменённых файлов: 196 добавлений и 16 удалений
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108
Documentation/ABI/testing/sysfs-driver-ufs
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@ -490,3 +490,111 @@ Description: This file contains a product revision string. The full
information about the descriptor could be found at
UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/boot_lun_id
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows boot LUN information. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/lun_write_protect
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows LUN write protection status. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/lun_queue_depth
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows LUN queue depth. This is one of the UFS
unit descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/psa_sensitive
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows PSA sensitivity. This is one of the UFS
unit descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/lun_memory_type
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows LUN memory type. This is one of the UFS
unit descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/data_reliability
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file defines the device behavior when a power failure
occurs during a write operation. This is one of the UFS
unit descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/logical_block_size
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the size of addressable logical blocks
(calculated as an exponent with base 2). This is one of
the UFS unit descriptor parameters. The full information about
the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/logical_block_count
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows total number of addressable logical blocks.
This is one of the UFS unit descriptor parameters. The full
information about the descriptor could be found at
UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/erase_block_size
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the erase block size. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/provisioning_type
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the thin provisioning type. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/physical_memory_resourse_count
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the total physical memory resources. This is
one of the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/context_capabilities
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the context capabilities. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/large_unit_granularity
Date: February 2018
Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Description: This file shows the granularity of the LUN. This is one of
the UFS unit descriptor parameters. The full information
about the descriptor could be found at UFS specifications 2.1.
The file is read only.

53
drivers/scsi/ufs/ufs-sysfs.c
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@ -550,6 +550,59 @@ static const struct attribute_group *ufs_sysfs_groups[] = {
NULL,
};
#define UFS_LUN_DESC_PARAM(_pname, _puname, _duname, _size) \
static ssize_t _pname##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct scsi_device *sdev = to_scsi_device(dev); \
struct ufs_hba *hba = shost_priv(sdev->host); \
u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun); \
if (!ufs_is_valid_unit_desc_lun(lun)) \
return -EINVAL; \
return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname, \
lun, _duname##_DESC_PARAM##_puname, buf, _size); \
} \
static DEVICE_ATTR_RO(_pname)
#define UFS_UNIT_DESC_PARAM(_name, _uname, _size) \
UFS_LUN_DESC_PARAM(_name, _uname, UNIT, _size)
UFS_UNIT_DESC_PARAM(boot_lun_id, _BOOT_LUN_ID, 1);
UFS_UNIT_DESC_PARAM(lun_write_protect, _LU_WR_PROTECT, 1);
UFS_UNIT_DESC_PARAM(lun_queue_depth, _LU_Q_DEPTH, 1);
UFS_UNIT_DESC_PARAM(psa_sensitive, _PSA_SENSITIVE, 1);
UFS_UNIT_DESC_PARAM(lun_memory_type, _MEM_TYPE, 1);
UFS_UNIT_DESC_PARAM(data_reliability, _DATA_RELIABILITY, 1);
UFS_UNIT_DESC_PARAM(logical_block_size, _LOGICAL_BLK_SIZE, 1);
UFS_UNIT_DESC_PARAM(logical_block_count, _LOGICAL_BLK_COUNT, 8);
UFS_UNIT_DESC_PARAM(erase_block_size, _ERASE_BLK_SIZE, 4);
UFS_UNIT_DESC_PARAM(provisioning_type, _PROVISIONING_TYPE, 1);
UFS_UNIT_DESC_PARAM(physical_memory_resourse_count, _PHY_MEM_RSRC_CNT, 8);
UFS_UNIT_DESC_PARAM(context_capabilities, _CTX_CAPABILITIES, 2);
UFS_UNIT_DESC_PARAM(large_unit_granularity, _LARGE_UNIT_SIZE_M1, 1);
static struct attribute *ufs_sysfs_unit_descriptor[] = {
&dev_attr_boot_lun_id.attr,
&dev_attr_lun_write_protect.attr,
&dev_attr_lun_queue_depth.attr,
&dev_attr_psa_sensitive.attr,
&dev_attr_lun_memory_type.attr,
&dev_attr_data_reliability.attr,
&dev_attr_logical_block_size.attr,
&dev_attr_logical_block_count.attr,
&dev_attr_erase_block_size.attr,
&dev_attr_provisioning_type.attr,
&dev_attr_physical_memory_resourse_count.attr,
&dev_attr_context_capabilities.attr,
&dev_attr_large_unit_granularity.attr,
NULL,
};
const struct attribute_group ufs_sysfs_unit_descriptor_group = {
.name = "unit_descriptor",
.attrs = ufs_sysfs_unit_descriptor,
};
void ufs_sysfs_add_nodes(struct device *dev)
{
int ret;

2
drivers/scsi/ufs/ufs-sysfs.h
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@ -11,4 +11,6 @@
void ufs_sysfs_add_nodes(struct device *dev);
void ufs_sysfs_remove_nodes(struct device *dev);
extern const struct attribute_group ufs_sysfs_unit_descriptor_group;
#endif

11
drivers/scsi/ufs/ufs.h
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@ -182,6 +182,7 @@ enum unit_desc_param {
UNIT_DESC_PARAM_BOOT_LUN_ID = 0x4,
UNIT_DESC_PARAM_LU_WR_PROTECT = 0x5,
UNIT_DESC_PARAM_LU_Q_DEPTH = 0x6,
UNIT_DESC_PARAM_PSA_SENSITIVE = 0x7,
UNIT_DESC_PARAM_MEM_TYPE = 0x8,
UNIT_DESC_PARAM_DATA_RELIABILITY = 0x9,
UNIT_DESC_PARAM_LOGICAL_BLK_SIZE = 0xA,
@ -592,4 +593,14 @@ struct ufs_dev_desc {
char model[MAX_MODEL_LEN + 1];
};
/**
* ufs_is_valid_unit_desc_lun - checks if the given LUN has a unit descriptor
* @lun: LU number to check
* @return: true if the lun has a matching unit descriptor, false otherwise
*/
static inline bool ufs_is_valid_unit_desc_lun(u8 lun)
{
return lun == UFS_UPIU_RPMB_WLUN || (lun < UFS_UPIU_MAX_GENERAL_LUN);
}
#endif /* End of Header */

23
drivers/scsi/ufs/ufshcd.c
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@ -2222,21 +2222,6 @@ static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
return ret;
}
/*
* ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
* @scsi_lun: scsi LUN id
*
* Returns UPIU LUN id
*/
static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
{
if (scsi_is_wlun(scsi_lun))
return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
| UFS_UPIU_WLUN_ID;
else
return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
}
/**
* ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
* @scsi_lun: UPIU W-LUN id
@ -3171,7 +3156,7 @@ static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
* Unit descriptors are only available for general purpose LUs (LUN id
* from 0 to 7) and RPMB Well known LU.
*/
if (lun != UFS_UPIU_RPMB_WLUN && (lun >= UFS_UPIU_MAX_GENERAL_LUN))
if (!ufs_is_valid_unit_desc_lun(lun))
return -EOPNOTSUPP;
return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
@ -6481,6 +6466,11 @@ static enum blk_eh_timer_return ufshcd_eh_timed_out(struct scsi_cmnd *scmd)
return found ? BLK_EH_NOT_HANDLED : BLK_EH_RESET_TIMER;
}
static const struct attribute_group *ufshcd_driver_groups[] = {
&ufs_sysfs_unit_descriptor_group,
NULL,
};
static struct scsi_host_template ufshcd_driver_template = {
.module = THIS_MODULE,
.name = UFSHCD,
@ -6500,6 +6490,7 @@ static struct scsi_host_template ufshcd_driver_template = {
.can_queue = UFSHCD_CAN_QUEUE,
.max_host_blocked = 1,
.track_queue_depth = 1,
.sdev_groups = ufshcd_driver_groups,
};
static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,

15
drivers/scsi/ufs/ufshcd.h
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@ -1003,4 +1003,19 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)
extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
/*
* ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
* @scsi_lun: scsi LUN id
*
* Returns UPIU LUN id
*/
static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
{
if (scsi_is_wlun(scsi_lun))
return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
| UFS_UPIU_WLUN_ID;
else
return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
}
#endif /* End of Header */