linux-kernel - Re: [PATCH v4 00/10] ufs: sysfs: read-only access to device descriptors, attributes and flags

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Date:   Thu, 01 Feb 2018 10:48:53 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Stanislav Nijnikov <stanislav.nijnikov@....com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, jaegeuk@...nel.org,
        alex.lemberg@....com
Subject: Re: [PATCH v4 00/10] ufs: sysfs: read-only access to device descriptors, attributes and flags


Can you please clarify the naming, at least as far as saying scsi/ufs.

Universal Flash Storage is not the same thing as all as the Unix File
System which has been using the acronym ufs for much longer.

I saw this patchset and I was wondering what in the world does a
filesystem need with sysfs entries.

Eric


Stanislav Nijnikov <stanislav.nijnikov@....com> writes:

> This patch introduces sysfs entries that will provide read-only access to
> device management data that could be received with UFS query requests.
> User-space applications will be able to read UFS device descriptors,
> flags and attributes. This will allow to get full UFS device configuration
> and its status. The descriptors are provided as set of files representing
> its parameters. The flags are using "true"/"false" representation of
> their value. The attributes are shown as hexadecimal value. The
> descriptors, attributes and flags are placed in separate subfolders under
> the UFS device sysfs entry (/sys/bus/platform/drivers/ufshcd/*/). The
> string descriptor subfolder contains five string descriptors defined by
> UFS specification 2.1. The LUN specific descriptor and attribute are 
> placed under corresponding SCSI device sysfs entries
> (/sys/class/scsi_device/*/device/).
> In addition the patch presents an additional field in the
> scsi_host_template structure - struct attribute_group **sdev_group.
> This field allows to define groups of attributes. It will provide an
> ability to use binary attributes in addition to device attributes and
> to group them under subfolders if necessary.
>
> Changelog:
> v3 -> v4
> Additional patch the introduces default attributes group for the
> existing ufs sysfs entries (rpm_lvl and spm_lvl)
> The ufs_sysfs_read_desc_param function calls to ufshcd_read_desc_param
> insted of ufshcd_query_descriptor_retry to avoid code duplication.
> The code was updated to remove the checkpatch error "ERROR: Macros 
> with complex values should be enclosed in parentheses"
> Added "_" to macros parameters to remove "#undef DEVICE_CLASS"
> The legal information was updated to satisfy the SPDX requirements
> The date in Documentation/ABI/testing/sysfs-driver-ufs was updated.
>
> v2 -> v3
> The Makefile is updated to make ufs-sysfs.c part of the ufshcd module.
> The unnecessary EXPORT_SYMBOL were removed
> Added a legal info header to the new files
> The date in Documentation/ABI/testing/sysfs-driver-ufs was updated.
>
> v1 -> v2
> Provided additional description for the changes
>
> Stanislav Nijnikov (10):
>   ufs: sysfs: attribute group for existing sysfs entries.
>   ufs: sysfs: device descriptor
>   ufs: sysfs: interconnect descriptor
>   ufs: sysfs: geometry descriptor
>   ufs: sysfs: health descriptor
>   ufs: sysfs: power descriptor
>   ufs: sysfs: string descriptors
>   ufs: sysfs: unit descriptor
>   ufs: sysfs: flags
>   ufs: sysfs: attributes
>
>  Documentation/ABI/testing/sysfs-driver-ufs | 804 +++++++++++++++++++++++++++++
>  drivers/scsi/scsi_sysfs.c                  |  14 +
>  drivers/scsi/ufs/Makefile                  |   3 +-
>  drivers/scsi/ufs/ufs-sysfs.c               | 757 +++++++++++++++++++++++++++
>  drivers/scsi/ufs/ufs-sysfs.h               |  25 +
>  drivers/scsi/ufs/ufs.h                     | 115 ++++-
>  drivers/scsi/ufs/ufshcd.c                  | 218 ++------
>  drivers/scsi/ufs/ufshcd.h                  |  34 ++
>  include/scsi/scsi_host.h                   |   6 +
>  9 files changed, 1785 insertions(+), 191 deletions(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-ufs
>  create mode 100644 drivers/scsi/ufs/ufs-sysfs.c
>  create mode 100644 drivers/scsi/ufs/ufs-sysfs.h