linux-kernel - Re: [PATCH V2 3/3] scsi: ufs: Add sysfs support for ufs provision

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Date:   Sat, 9 Jun 2018 09:24:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sayali Lokhande <sayalil@...eaurora.org>
Cc:     subhashj@...eaurora.org, cang@...eaurora.org,
        vivek.gautam@...eaurora.org, rnayak@...eaurora.org,
        vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, asutoshd@...eaurora.org,
        evgreen@...omium.org, linux-scsi@...r.kernel.org,
        Stanislav Nijnikov <stanislav.nijnikov@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 3/3] scsi: ufs: Add sysfs support for ufs provision

On Fri, Jun 08, 2018 at 04:36:30PM +0530, Sayali Lokhande wrote:
> Add sysfs support to trigger ufs provisioning at runtime.
> Usage : echo <desc_buf> > /sys/bus/platform/drivers/*/
> 	config_descriptor/ufs_provision
> To check provisioning status:
> cat /sys/bus/platform/drivers/*/config_descriptor/ufs_provision
> 1- > Success (Reboot device to check updated provisioning)
> 
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> ---
>  Documentation/ABI/testing/sysfs-driver-ufs |  16 ++++
>  drivers/scsi/ufs/ufs-sysfs.c               |  25 ++++++
>  drivers/scsi/ufs/ufs.h                     |   2 +
>  drivers/scsi/ufs/ufshcd.c                  | 128 +++++++++++++++++++++++++++++
>  drivers/scsi/ufs/ufshcd.h                  |   5 ++
>  5 files changed, 176 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
> index 016724e..43419b5 100644
> --- a/Documentation/ABI/testing/sysfs-driver-ufs
> +++ b/Documentation/ABI/testing/sysfs-driver-ufs
> @@ -883,3 +883,19 @@ Contact:	Subhash Jadavani <subhashj@...eaurora.org>
>  Description:	This entry shows the target state of an UFS UIC link
>  		for the chosen system power management level.
>  		The file is read only.
> +
> +What:		/sys/bus/platform/drivers/ufshcd/*/config_descriptor/ufs_provision
> +Date:		February 2018
> +Contact:	Sayali Lokhande <sayalil@...eaurora.org>
> +Description:	This file shows the status of runtime ufs provisioning.
> +		This can be used to provision ufs device if bConfigDescrLock is 0.
> +		Configuration buffer needs to be written in space separated format
> +		specificied as:
> +		echo <bNumberLU> <bBootEnable> <bDescrAccessEn> <bInitPowerMode>
> +		<bHighPriorityLUN> <bSecureRemovalType> <bInitActiveICCLevel>
> +		<wPeriodicRTCUpdate> <bConfigDescrLock> <LUNum> <bLUEnable>
> +		<bBootLunID> <size_in_kb> <bDataReliability> <bLUWriteProtect>
> +		<bMemoryType> <bLogicalBlockSize> <bProvisioningType>
> +		<wContextCapabilities> > ufs_provision

That's crazy big, please use configfs for this if you really want to
"provision" hardware with a new api.  That is what configfs was created
for, do not abuse sysfs like this, it is not a "single" value.

thanks,

greg k-h