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

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Date:   Thu, 14 Jun 2018 17:22:01 +0530
From:   "sayali" <sayalil@...eaurora.org>
To:     "'Greg Kroah-Hartman'" <gregkh@...uxfoundation.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

-----Original Message-----
From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org] 
Sent: Saturday, June 09, 2018 12:55 PM
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.
[Sayali] Sure. I will check and update my next patchset accordingly to use
configfs for provisioning at runtime.

thanks,

greg k-h