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[PATCH v7 0/6] of: overlay: kobject & sysfs'ation

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  [PATCH v7 0/6] of: overlay: kobject & sysfs'ation Pantelis Antoniou <pantelis.antoniou@konsulko.com> - 2015-10-22 22:00 +0200
    [PATCH v7 3/6] Documentation: ABI: overlays - global attributes Pantelis Antoniou <pantelis.antoniou@konsulko.com> - 2015-10-22 22:00 +0200
      Re: [PATCH v7 3/6] Documentation: ABI: overlays - global attributes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-22 22:20 +0200

#1254146 — [PATCH v7 0/6] of: overlay: kobject & sysfs'ation

The first patch puts the overlays as objects in the sysfs in
/sys/firmware/devicetree/overlays.

The #2 adds a master overlay enable switch (that once is set to
disabled can't be re-enabled), while the one after that
introduces a number of default per overlay attributes.
The patch following is the ABI docs for the sysfs entries of #2,
while the next one updates the doc entry for the kernel parameter
of_overlay_disable.

Patch #5 add per overlay sysfs attributes, and the next one is
documentation about it.

The patchset is against linus's tree as of today.

Changes since v6:
* Updated changelogs as per maintainer suggestion.
* Fixed documentation entries and split them up
* Added command line parameter docs.

Changes since v5:
* Does a single kobject_put that suffices
* A per-fragment sysfs directory and a single value target.
* Update in the ABI documention.

Changes since v4:
* Rebased against latest mainline.

Changes since v3:
* Used strtobool instead of kstrtoul
* ABI Documentation includes a pointer to the discussion that
requested the sysfs property.

Changes since v2:
* Removed the unittest patch.
* Split the sysfs attribute patch to a global and a per-overlay
  patch.
* Dropped binary attributes using textual kobj_attributes instead.

Changes since v1:
* Maintainer requested changes.
* Documented the sysfs entries
* Per overlay sysfs attributes.
Pantelis Antoniou (6):
  of: overlay: kobjectify overlay objects
  of: overlay: global sysfs enable attribute
  Documentation: ABI: overlays - global attributes
  Documentation: document of_overlay_disable parameter
  of: overlay: add per overlay sysfs attributes
  Documentation: ABI: overlays - per overlay docs

 .../ABI/testing/sysfs-firmware-devicetree-overlays |  52 ++++++
 Documentation/kernel-parameters.txt                |   3 +
 drivers/of/base.c                                  |   7 +
 drivers/of/of_private.h                            |   9 +
 drivers/of/overlay.c                               | 201 ++++++++++++++++++++-
 5 files changed, 266 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays

-- 
1.7.12

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#1254147 — [PATCH v7 3/6] Documentation: ABI: overlays - global attributes

Documentation ABI entry for overlays sysfs entries.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
---
 .../ABI/testing/sysfs-firmware-devicetree-overlays | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays

diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
new file mode 100644
index 0000000..e938f44
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
@@ -0,0 +1,24 @@
+What:		/sys/firmware/devicetree/overlays/
+Date:		October 2015
+Contact:	Pantelis Antoniou <pantelis.antoniou@konsulko.com>
+Description:
+		This directory contains the applied device tree overlays of
+		the running system, as directories of the overlay id.
+
+What:		/sys/firmware/devicetree/overlays/enable
+Date:		October 2015
+Contact:	Pantelis Antoniou <pantelis.antoniou@konsulko.com>
+Description:
+		The master enable switch, by default is 1, and when
+		set to 0 it cannot be re-enabled for security reasons.
+
+		The discussion about this switch takes place in:
+		http://comments.gmane.org/gmane.linux.drivers.devicetree/101871
+
+		Kees Cook:
+		"Coming from the perspective of drawing a bright line between
+		kernel and the root user (which tends to start with disabling
+		kernel module loading), I would say that there at least needs
+		to be a high-level one-way "off" switch for the interface so
+		that systems that have this interface can choose to turn it off
+		during initial boot, etc."
-- 
1.7.12

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#1254157 — Re: [PATCH v7 3/6] Documentation: ABI: overlays - global attributes

On Thu, Oct 22, 2015 at 10:50:24PM +0300, Pantelis Antoniou wrote:
> Documentation ABI entry for overlays sysfs entries.
> 
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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