[PATCH v5 1/1] scsi: ufs: core: add device level exception support

[Arthur Simchaev]

> Subject: [PATCH v5 1/1] scsi: ufs: core: add device level exception support
> 
> The ufs device JEDEC specification version 4.1 adds support for the device level
> exception events. To support this new device level exception feature, expose
> two new sysfs nodes below to provide the user space access to the device level
> exception information.
> /sys/bus/platform/drivers/ufshcd/*/device_lvl_exception_count
> /sys/bus/platform/drivers/ufshcd/*/device_lvl_exception_id
> 
> The device_lvl_exception_count sysfs node reports the number of device level
> exceptions that have occurred since the last time this variable is reset. Writing
> a value of 0 will reset it.
> The device_lvl_exception_id reports the exception ID which is the
> qDeviceLevelExceptionID attribute of the device JEDEC specifications version
> 4.1 and later. The user space application can query these sysfs nodes to get
> more information about the device level exception.
> 
> Signed-off-by: Bao D. Nguyen <quic_nguyenb at quicinc.com>
> Reviewed-by: Peter Wang <peter.wang at mediatek.com>
> Reviewed-by: Bart Van Assche <bvanassche at acm.org>

Reviewed-by: Arthur Simchaev <arthur.simchaev at sandisk.com>