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Message-ID: <fc305cad-a0db-9c4b-9d5f-14e8e48a23b3@intel.com>
Date: Tue, 17 Jul 2018 16:06:08 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Sayali Lokhande <sayalil@...eaurora.org>, 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,
riteshh@...eaurora.org
Cc: linux-scsi@...r.kernel.org,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V6] scsi: ufs: Add configfs support for UFS provisioning
On 16/07/18 12:43, Sayali Lokhande 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 needs to be enabled for using this feature.
>
> Usage:
> 1) To read current configuration descriptor :
> cat /config/XXXX.ufshc/ufs_provision
> 2) To provision ufs device:
> echo <config_desc_buf> > /config/XXXX.ufshc/ufs_provision
>
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> ---
> Documentation/ABI/testing/configfs-driver-ufs | 18 +++
> drivers/scsi/ufs/Kconfig | 10 ++
> drivers/scsi/ufs/Makefile | 1 +
> drivers/scsi/ufs/ufs-configfs.c | 162 ++++++++++++++++++++++++++
> drivers/scsi/ufs/ufshcd.c | 2 +
> drivers/scsi/ufs/ufshcd.h | 19 +++
> 6 files changed, 212 insertions(+)
> create mode 100644 Documentation/ABI/testing/configfs-driver-ufs
> create mode 100644 drivers/scsi/ufs/ufs-configfs.c
>
> diff --git a/Documentation/ABI/testing/configfs-driver-ufs b/Documentation/ABI/testing/configfs-driver-ufs
> new file mode 100644
> index 0000000..eeee499c
> --- /dev/null
> +++ b/Documentation/ABI/testing/configfs-driver-ufs
> @@ -0,0 +1,18 @@
> +What: /config/ufshcd/ufs_provision
> +Date: Jun 2018
> +KernelVersion: 4.14
> +Description:
> + This file shows the current ufs configuration descriptor set in device.
> + This can be used to provision ufs device if bConfigDescrLock is 0.
> + For more details, refer 14.1.6.3 Configuration Descriptor and
> + Table 14-12 - Unit Descriptor configurable parameters from specs for
> + description of each configuration descriptor parameter.
> + Configuration descriptor buffer needs to be passed in space separated
> + format specificied as below:
> + echo <bLength> <bDescriptorIDN> <bConfDescContinue> <bBootEnable>
> + <bDescrAccessEn> <bInitPowerMode> <bHighPriorityLUN>
> + <bSecureRemovalType> <bInitActiveICCLevel> <wPeriodicRTCUpdate>
> + <0Bh:0Fh_ReservedAs_0> <bLUEnable> <bBootLunID> <bLUWriteProtect>
> + <bMemoryType> <dNumAllocUnits> <bDataReliability> <bLogicalBlockSize>
> + <bProvisioningType> <wContextCapabilities> <0Dh:0Fh_ReservedAs_0>
> + > /config/XXXX.ufshc/ufs_provision
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index e27b4d4..34d89c2 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -100,3 +100,13 @@ config SCSI_UFS_QCOM
>
> Select this if you have UFS controller on QCOM chipset.
> If unsure, say N.
> +
> +config UFS_PROVISION
> + tristate "Runtime UFS Provisioning support"
> + depends on SCSI_UFSHCD_PLATFORM && CONFIGFS_FS
Why SCSI_UFSHCD_PLATFORM instead of SCSI_UFSHCD?
Also please cc me in future revisions.
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