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Message-ID: <CY1PR0401MB0969E1C484E519EBB3F714309AF70@CY1PR0401MB0969.namprd04.prod.outlook.com>
Date: Mon, 12 Feb 2018 11:21:26 +0000
From: Stanislav Nijnikov <Stanislav.Nijnikov@....com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
Alex Lemberg <Alex.Lemberg@....com>
Subject: RE: [PATCH v5 02/11] scsi: ufs: sysfs: device descriptor
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Monday, February 12, 2018 3:08 AM
> To: Stanislav Nijnikov <Stanislav.Nijnikov@....com>
> Cc: linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org;
> gregkh@...uxfoundation.org; Alex Lemberg <Alex.Lemberg@....com>
> Subject: Re: [PATCH v5 02/11] scsi: ufs: sysfs: device descriptor
>
> On 02/06, Stanislav Nijnikov wrote:
> > This patch introduces a sysfs group entry for the UFS device
> > descriptor parameters. The group adds "device_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@....com>
> > ---
> > Documentation/ABI/testing/sysfs-driver-ufs | 223
> +++++++++++++++++++++++++++++
> > drivers/scsi/ufs/ufs-sysfs.c | 116 +++++++++++++++
> > drivers/scsi/ufs/ufs.h | 8 ++
> > drivers/scsi/ufs/ufshcd.c | 12 +-
> > drivers/scsi/ufs/ufshcd.h | 6 +
> > 5 files changed, 359 insertions(+), 6 deletions(-) create mode
> > 100644 Documentation/ABI/testing/sysfs-driver-ufs
> >
> > diff --git a/Documentation/ABI/testing/sysfs-driver-ufs
> > b/Documentation/ABI/testing/sysfs-driver-ufs
> > new file mode 100644
> > index 0000000..8da7b84
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-driver-ufs
> > @@ -0,0 +1,223 @@
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_type
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the device type. This is one of the UFS
> > + device descriptor parameters. The full information about
> > + the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_class
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the device class. This is one of the UFS
> > + device descriptor parameters. The full information about
> > + the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_sub_
> class
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the UFS storage subclass. This is one of
> > + the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/protocol
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the protocol supported by an UFS device.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_
> luns
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows number of logical units. This is one of
> > + the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_
> wluns
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows number of well known logical units.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/boot_enable
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows value that indicates whether the device is
> > + enabled for boot. This is one of the UFS device descriptor
> > + parameters. The full information about the descriptor could
> > + be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/descriptor_a
> ccess_enable
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows value that indicates whether the device
> > + descriptor could be read after partial initialization phase
> > + of the boot sequence. This is one of the UFS device
> descriptor
> > + parameters. The full information about the descriptor could
> > + be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/initial_powe
> r_mode
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows value that defines the power mode after
> > + device initialization or hardware reset. This is one of
> > + the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/high_priority
> _lun
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the high priority lun. This is one of
> > + the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/secure_rem
> oval_type
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the secure removal type. This is one of
> > + the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/support_sec
> urity_lun
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows whether the security lun is supported.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/bkops_termi
> nation_latency
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the background operations termination
> > + latency. This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/initial_active
> _icc_level
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the initial active ICC level. This is one
> > + of the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/specification
> _version
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the specification version. This is one
> > + of the UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/manufacturi
> ng_date
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the manufacturing date in BCD format.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/manufacture
> r_id
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the manufacturee ID. This is one of the
> > + UFS device descriptor parameters. The full information about
> > + the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/rtt_capabilit
> y
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the maximum number of outstanding RTTs
> > + supported by the device. This is one of the UFS device
> > + descriptor parameters. The full information about
> > + the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/rtc_update
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the frequency and method of the realtime
> > + clock update. This is one of the UFS device descriptor
> > + parameters. The full information about the descriptor
> > + could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/ufs_features
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows which features are supported by the device.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be
> > + found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/ffu_timeout
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the FFU timeout. This is one of the
> > + UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/queue_dept
> h
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the device queue depth. This is one of the
> > + UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_versi
> on
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the device version. This is one of the
> > + UFS device descriptor parameters. The full information
> > + about the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_
> secure_wpa
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows number of secure write protect areas
> > + supported by the device. This is one of the UFS device
> > + descriptor parameters. The full information about
> > + the descriptor could be found at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/psa_max_da
> ta_size
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the maximum amount of data that may be
> > + written during the pre-soldering phase of the PSA flow.
> > + This is one of the UFS device descriptor parameters.
> > + The full information about the descriptor could be found
> > + at UFS specifications 2.1.
> > + The file is read only.
> > +
> > +What:
> /sys/bus/platform/drivers/ufshcd/*/device_descriptor/psa_state_ti
> meout
> > +Date: February 2018
> > +Contact: Stanislav Nijnikov <stanislav.nijnikov@....com>
> > +Description: This file shows the command maximum timeout for a change
> > + in PSA state. This is one of the UFS device descriptor
> > + parameters. The full information about the descriptor could
> > + be found at UFS specifications 2.1.
> > + The file is read only.
> > diff --git a/drivers/scsi/ufs/ufs-sysfs.c
> > b/drivers/scsi/ufs/ufs-sysfs.c index ce8dcb6..aa2779a 100644
> > --- a/drivers/scsi/ufs/ufs-sysfs.c
> > +++ b/drivers/scsi/ufs/ufs-sysfs.c
> > @@ -3,7 +3,9 @@
> >
> > #include <linux/err.h>
> > #include <linux/string.h>
> > +#include <asm/unaligned.h>
> >
> > +#include "ufs.h"
> > #include "ufs-sysfs.h"
> >
> > static const char *ufschd_uic_link_state_to_string( @@ -134,8
> > +136,122 @@ static const struct attribute_group ufs_sysfs_default_group
> = {
> > .attrs = ufs_sysfs_ufshcd_attrs,
> > };
> >
> > +static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
> > + enum desc_idn desc_id,
> > + u8 desc_index,
> > + u8 param_offset,
> > + u8 *sysfs_buf,
> > + u8 param_size)
> > +{
> > + u8 desc_buf[8] = {0};
> > + int ret;
> > +
> > + if (param_size > 8)
> > + return -EINVAL;
> > +
> > + ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
> > + param_offset, desc_buf, param_size);
> > + if (ret)
> > + return -EINVAL;
> > + switch (param_size) {
> > + case 1:
> > + ret = sprintf(sysfs_buf, "0x%02X\n", *desc_buf);
> > + break;
> > + case 2:
> > + ret = sprintf(sysfs_buf, "0x%04X\n",
> > + get_unaligned_be16(desc_buf));
> > + break;
> > + case 4:
> > + ret = sprintf(sysfs_buf, "0x%08X\n",
> > + get_unaligned_be32(desc_buf));
> > + break;
> > + case 8:
> > + ret = sprintf(sysfs_buf, "0x%016llX\n",
> > + get_unaligned_be64(desc_buf));
> > + break;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +#define UFS_DESC_PARAM(_name, _puname, _duname, _size)
> \
> > +static ssize_t _name##_show(struct device *dev,
> \
> > + struct device_attribute *attr, char *buf) \
> > +{ \
> > + struct ufs_hba *hba = dev_get_drvdata(dev); \
> > + return ufs_sysfs_read_desc_param(hba,
> QUERY_DESC_IDN_##_duname, \
> > + 0, _duname##_DESC_PARAM##_puname, buf, _size);
> \
> > +} \
> > +static DEVICE_ATTR_RO(_name)
> > +
> > +#define UFS_DEVICE_DESC_PARAM(_name, _uname, _size)
> \
> > + UFS_DESC_PARAM(_name, _uname, DEVICE, _size)
> > +
> > +UFS_DEVICE_DESC_PARAM(device_type, _DEVICE_TYPE, 1);
> > +UFS_DEVICE_DESC_PARAM(device_class, _DEVICE_CLASS, 1);
> > +UFS_DEVICE_DESC_PARAM(device_sub_class, _DEVICE_SUB_CLASS, 1);
> > +UFS_DEVICE_DESC_PARAM(protocol, _PRTCL, 1);
> > +UFS_DEVICE_DESC_PARAM(number_of_luns, _NUM_LU, 1);
> > +UFS_DEVICE_DESC_PARAM(number_of_wluns, _NUM_WLU, 1);
> > +UFS_DEVICE_DESC_PARAM(boot_enable, _BOOT_ENBL, 1);
> > +UFS_DEVICE_DESC_PARAM(descriptor_access_enable,
> _DESC_ACCSS_ENBL, 1);
> > +UFS_DEVICE_DESC_PARAM(initial_power_mode, _INIT_PWR_MODE, 1);
> > +UFS_DEVICE_DESC_PARAM(high_priority_lun, _HIGH_PR_LUN, 1);
> > +UFS_DEVICE_DESC_PARAM(secure_removal_type, _SEC_RMV_TYPE, 1);
> > +UFS_DEVICE_DESC_PARAM(support_security_lun, _SEC_LU, 1);
> > +UFS_DEVICE_DESC_PARAM(bkops_termination_latency,
> _BKOP_TERM_LT, 1);
> > +UFS_DEVICE_DESC_PARAM(initial_active_icc_level, _ACTVE_ICC_LVL, 1);
> > +UFS_DEVICE_DESC_PARAM(specification_version, _SPEC_VER, 2);
> > +UFS_DEVICE_DESC_PARAM(manufacturing_date, _MANF_DATE, 2);
> > +UFS_DEVICE_DESC_PARAM(manufacturer_id, _MANF_ID, 2);
> > +UFS_DEVICE_DESC_PARAM(rtt_capability, _RTT_CAP, 1);
> > +UFS_DEVICE_DESC_PARAM(rtc_update, _FRQ_RTC, 2);
> > +UFS_DEVICE_DESC_PARAM(ufs_features, _UFS_FEAT, 1);
> > +UFS_DEVICE_DESC_PARAM(ffu_timeout, _FFU_TMT, 1);
> > +UFS_DEVICE_DESC_PARAM(queue_depth, _Q_DPTH, 1);
> > +UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);
> > +UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA,
> 1);
> > +UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);
> > +UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);
>
> Could you add this case as well?
>
> DEVICE_DESC_PARAM_PRDCT_REV = 0x2A,
>
This value was omitted intentionally. It holds an index of the string descriptor with the
product revision. There are 4 more such fields in the device descriptor:
- DEVICE_DESC_PARAM_MANF_NAME = 0x14
- DEVICE_DESC_PARAM_PRDCT_NAME = 0x15,
- DEVICE_DESC_PARAM_SN = 0x16,
- DEVICE_DESC_PARAM_OEM_ID = 0x17,
The indexes itself don't provide any useful information to users and the
corresponding strings are shown by the string descriptors (see "[PATCH v5 07/11]
scsi: ufs: sysfs: string descriptors")
Regards
> > +
> > +static struct attribute *ufs_sysfs_device_descriptor[] = {
> > + &dev_attr_device_type.attr,
> > + &dev_attr_device_class.attr,
> > + &dev_attr_device_sub_class.attr,
> > + &dev_attr_protocol.attr,
> > + &dev_attr_number_of_luns.attr,
> > + &dev_attr_number_of_wluns.attr,
> > + &dev_attr_boot_enable.attr,
> > + &dev_attr_descriptor_access_enable.attr,
> > + &dev_attr_initial_power_mode.attr,
> > + &dev_attr_high_priority_lun.attr,
> > + &dev_attr_secure_removal_type.attr,
> > + &dev_attr_support_security_lun.attr,
> > + &dev_attr_bkops_termination_latency.attr,
> > + &dev_attr_initial_active_icc_level.attr,
> > + &dev_attr_specification_version.attr,
> > + &dev_attr_manufacturing_date.attr,
> > + &dev_attr_manufacturer_id.attr,
> > + &dev_attr_rtt_capability.attr,
> > + &dev_attr_rtc_update.attr,
> > + &dev_attr_ufs_features.attr,
> > + &dev_attr_ffu_timeout.attr,
> > + &dev_attr_queue_depth.attr,
> > + &dev_attr_device_version.attr,
> > + &dev_attr_number_of_secure_wpa.attr,
> > + &dev_attr_psa_max_data_size.attr,
> > + &dev_attr_psa_state_timeout.attr,
> > + NULL,
> > +};
> > +
> > +static const struct attribute_group ufs_sysfs_device_descriptor_group = {
> > + .name = "device_descriptor",
> > + .attrs = ufs_sysfs_device_descriptor, };
> > +
> > static const struct attribute_group *ufs_sysfs_groups[] = {
> > &ufs_sysfs_default_group,
> > + &ufs_sysfs_device_descriptor_group,
> > NULL,
> > };
> >
> > diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index
> > 54deeb7..6ae1e08 100644
> > --- a/drivers/scsi/ufs/ufs.h
> > +++ b/drivers/scsi/ufs/ufs.h
> > @@ -220,6 +220,14 @@ enum device_desc_param {
> > DEVICE_DESC_PARAM_UD_LEN = 0x1B,
> > DEVICE_DESC_PARAM_RTT_CAP = 0x1C,
> > DEVICE_DESC_PARAM_FRQ_RTC = 0x1D,
> > + DEVICE_DESC_PARAM_UFS_FEAT = 0x1F,
> > + DEVICE_DESC_PARAM_FFU_TMT = 0x20,
> > + DEVICE_DESC_PARAM_Q_DPTH = 0x21,
> > + DEVICE_DESC_PARAM_DEV_VER = 0x22,
> > + DEVICE_DESC_PARAM_NUM_SEC_WPA = 0x24,
> > + DEVICE_DESC_PARAM_PSA_MAX_DATA = 0x25,
> > + DEVICE_DESC_PARAM_PSA_TMT = 0x29,
> > + DEVICE_DESC_PARAM_PRDCT_REV = 0x2A,
> > };
> >
> > /*
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index e7621a0a..540a431 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -2989,12 +2989,12 @@
> EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);
> > *
> > * Return 0 in case of success, non-zero otherwise
> > */
> > -static int ufshcd_read_desc_param(struct ufs_hba *hba,
> > - enum desc_idn desc_id,
> > - int desc_index,
> > - u8 param_offset,
> > - u8 *param_read_buf,
> > - u8 param_size)
> > +int ufshcd_read_desc_param(struct ufs_hba *hba,
> > + enum desc_idn desc_id,
> > + int desc_index,
> > + u8 param_offset,
> > + u8 *param_read_buf,
> > + u8 param_size)
> > {
> > int ret;
> > u8 *desc_buf;
> > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> > index 53e2779..38c307d 100644
> > --- a/drivers/scsi/ufs/ufshcd.h
> > +++ b/drivers/scsi/ufs/ufshcd.h
> > @@ -841,6 +841,12 @@ static inline bool ufshcd_is_hs_mode(struct
> > ufs_pa_layer_attr *pwr_info) }
> >
> > /* Expose Query-Request API */
> > +int ufshcd_read_desc_param(struct ufs_hba *hba,
> > + enum desc_idn desc_id,
> > + int desc_index,
> > + u8 param_offset,
> > + u8 *param_read_buf,
> > + u8 param_size);
> > int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> > enum flag_idn idn, bool *flag_res);
> > int ufshcd_hold(struct ufs_hba *hba, bool async);
> > --
> > 2.7.4
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