linux-kernel - Re: [PATCH v3 1/1] scsi: ufs: core: add device level exception support

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Message-ID: <61570104d58cef22716fefe459c0c45670108aad.camel@mediatek.com>
Date: Wed, 19 Mar 2025 07:56:31 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
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Subject: Re: [PATCH v3 1/1] scsi: ufs: core: add device level exception
 support

On Wed, 2025-03-19 at 00:29 -0700, Bao D. Nguyen wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> 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@...cinc.com>
> Reviewed-by: Peter Wang <peter.wang@...iatek.com>
> ---
> Changes in v3:
> 1. Add protection for hba->dev_lvl_exception_count accesses in
> different
> contexts (Bart's comment).

Hi Bao,

Could use atomic_t for counter protect?

Thanks.
Peter