linux-kernel - Re: [PATCH V14 2/2] scsi: ufs: Add configfs support for UFS provisioning

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Message-ID: <CAE=gft5k-rC=EJrz06Oh8BdNfcKF5ukavGzDqvYHOVTf84AyUg@mail.gmail.com>
Date:   Mon, 24 Sep 2018 13:38:48 -0700
From:   Evan Green <evgreen@...omium.org>
To:     sayali <sayalil@...eaurora.org>
Cc:     subhashj@...eaurora.org, cang@...eaurora.org,
        vivek.gautam@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        asutoshd@...eaurora.org, riteshh@...eaurora.org,
        stummala@...eaurora.org, adrian.hunter@...el.com,
        Joel Becker <jlbec@...lplan.org>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V14 2/2] scsi: ufs: Add configfs support for UFS provisioning

On Sun, Sep 23, 2018 at 11:29 PM Sayali Lokhande <sayalil@...eaurora.org> wrote:
>
> This patch adds configfs support to provision UFS device at
> runtime. This feature can be primarily useful in factory or
> assembly line as some devices may be required to be configured
> multiple times during initial system development phase.
> Configuration Descriptors can be written multiple times until
> bConfigDescrLock attribute is zero.
>
> Configuration descriptor buffer consists of Device and Unit
> descriptor configurable parameters which are parsed from vendor
> specific provisioning file and then passed via configfs node at
> runtime to provision ufs device.
> CONFIG_CONFIGFS_FS and CONFIG_SCSI_UFS_PROVISION needs to be enabled
> for using this feature.
>
> Usage:
> 1) To read current configuration descriptor with index X
>    (where index X can be 0/1/2/3) :
>    cat /config/<device_name>/ufs_config_desc_X
>
> 2) To write configuration descriptor with index X :
>    echo <config_desc_buf> > /config/<device_name>/ufs_config_desc_X
>
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> ---
>  Documentation/ABI/testing/configfs-driver-ufs |  12 ++
>  drivers/scsi/ufs/Kconfig                      |  10 ++
>  drivers/scsi/ufs/Makefile                     |   1 +
>  drivers/scsi/ufs/ufs-configfs.c               | 237 ++++++++++++++++++++++++++
>  drivers/scsi/ufs/ufshcd.c                     |   3 +-
>  drivers/scsi/ufs/ufshcd.h                     |  18 ++
>  6 files changed, 280 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/ABI/testing/configfs-driver-ufs
>  create mode 100644 drivers/scsi/ufs/ufs-configfs.c
>

Reviewed-by: Evan Green <evgreen@...omium.org>