linux-kernel - [PATCH v6 0/3] Move recovery/coredump configuration to sysfs

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Date:   Mon, 28 Sep 2020 15:17:33 -0700
From:   Rishabh Bhatnagar <rishabhb@...eaurora.org>
To:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org
Cc:     tsoni@...eaurora.org, psodagud@...eaurora.org,
        sidgup@...eaurora.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: [PATCH v6 0/3] Move recovery/coredump configuration to sysfs

>From Android R onwards Google has restricted access to debugfs in user
and user-debug builds. This restricts access to most of the features
exposed through debugfs. 'Coredump' and 'Recovery' are critical
interfaces that are required for remoteproc to work on Qualcomm Chipsets. 
Coredump configuration needs to be set to "inline" in debug/test builds
and "disabled" in production builds. Whereas recovery needs to be
"disabled" for debugging purposes and "enabled" on production builds.
This patch series removes the recovery/coredump entries from debugfs
and moves them to sysfs. Also, this disables the coredump collection
by default as this is a requirement for production devices.

Changelog:

v6 -> v5:
- Disable coredump collection by default
- Rename the "default" configuration to "enabled" to avoid confusion

v5 -> v4:
- Fix the cover-letter of tha patch series.

v4 -> v3:
- Remove the feature flag to expose recovery/coredump

v3 -> v2:
- Remove the coredump/recovery entries from debugfs
- Expose recovery/coredump from sysfs under a feature flag

v1 -> v2:
- Correct the contact name in the sysfs documentation.
- Remove the redundant write documentation for coredump/recovery sysfs
- Add a feature flag to make this interface switch configurable.

Rishabh Bhatnagar (3):
  remoteproc: Move coredump configuration to sysfs
  remoteproc: Move recovery configuration to sysfs
  remoteproc: Change default dump configuration to "disabled"

 Documentation/ABI/testing/sysfs-class-remoteproc |  46 +++++++
 drivers/remoteproc/remoteproc_coredump.c         |   6 +-
 drivers/remoteproc/remoteproc_debugfs.c          | 168 -----------------------
 drivers/remoteproc/remoteproc_sysfs.c            | 120 ++++++++++++++++
 include/linux/remoteproc.h                       |   8 +-
 5 files changed, 173 insertions(+), 175 deletions(-)

-- 
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