From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
I'm respinning this series now because I noticed that I need to start writing
tests for my work on the new libgpiod v2 code to make sense (it's just becoming
too complicated to make even remotely functional without test coverage). At the
same time I don't want to rewrite the tests using gpio-mockup if the goal is to
replace it with gpio-sim anyway.
I fixed issues pointed out by Al Viro and made sure that references are
correctly counted (including error paths) and that memory allocated for the
pending and live groups gets freed.
===
Cc'ing Viresh too.
Viresh: while there's still a long way to go before the libgpio v2.0 release,
in order to merge the Rust bindings, we'll need a test-suite similar to what
we have now for C++ and Python bindings, except that it will have to be based
on the gpio-sim module when it makes its way into mainline.
===
This series adds a new GPIO testing module based on configfs committable items
and sysfs. The goal is to provide a testing driver that will be configurable
at runtime (won't need module reload) and easily extensible. The control over
the attributes is also much more fine-grained than in gpio-mockup.
This series also contains a respin of the patches I sent separately to the
configfs maintainers - these patches implement the concept of committable
items that was well defined for a long time but never actually completed.
Apart from the new driver itself, its selftests and the configfs patches, this
series contains some changes to the bitmap API - most importantly: it adds
devres managed variants of bitmap_alloc() and bitmap_zalloc().
v1 -> v2:
- add selftests for gpio-sim
- add helper programs for selftests
- update the configfs rename callback to work with the new API introduced in
v5.11
- fix a missing quote in the documentation
- use !! whenever using bits operation that are required to return 0 or 1
- use provided bitmap API instead of reimplementing copy or fill operations
- fix a deadlock in gpio_sim_direction_output()
- add new read-only configfs attributes for mapping of configfs items to GPIO
device names
- and address other minor issues pointed out in reviews of v1
v2 -> v3:
- use devm_bitmap_alloc() instead of the zalloc variant if we're initializing
the bitmap with 1s
- drop the patch exporting device_is_bound()
- don't return -ENODEV from dev_nam and chip_name configfs attributes, return
a string indicating that the device is not available yet ('n/a')
- fix indentation where it makes sense
- don't protect IDA functions which use their own locking and where it's not
needed
- use kmemdup() instead of kzalloc() + memcpy()
- collected review tags
- minor coding style fixes
v3 -> v4:
- return 'none' instead of 'n/a' from dev_name and chip_name before the device
is registered
- use sysfs_emit() instead of s*printf()
- drop GPIO_SIM_MAX_PROP as it's only used in an array's definition where it's
fine to hardcode the value
v4 -> v5:
- drop lib patches that are already upstream
- use BIT() instead of (1UL << bit) for flags
- fix refcounting for the configfs_dirent in rename()
- drop d_move() from the rename() callback
- free memory allocated for the live and pending groups in configfs_d_iput()
and not in detach_groups()
- make sure that if a group of some name is in the live directory, a new group
with the same name cannot be created in the pending directory
v5 -> v6:
- go back to using (1UL << bit) instead of BIT()
- if the live group dentry doesn't exist for whatever reason at the time when
mkdir() in the pending group is called (would be a BUG()), return -ENOENT
instead of -EEXIST which should only be returned if given subsystem already
exists in either live or pending group
Bartosz Golaszewski (8):
configfs: increase the item name length
configfs: use (1UL << bit) for internal flags
configfs: implement committable items
samples: configfs: add a committable group
gpio: sim: new testing module
selftests: gpio: provide a helper for reading chip info
selftests: gpio: add a helper for reading GPIO line names
selftests: gpio: add test cases for gpio-sim
Documentation/admin-guide/gpio/gpio-sim.rst | 72 ++
Documentation/filesystems/configfs.rst | 6 +-
drivers/gpio/Kconfig | 8 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-sim.c | 877 ++++++++++++++++++
fs/configfs/configfs_internal.h | 22 +-
fs/configfs/dir.c | 276 +++++-
include/linux/configfs.h | 3 +-
samples/configfs/configfs_sample.c | 153 +++
tools/testing/selftests/gpio/.gitignore | 2 +
tools/testing/selftests/gpio/Makefile | 4 +-
tools/testing/selftests/gpio/config | 1 +
tools/testing/selftests/gpio/gpio-chip-info.c | 57 ++
tools/testing/selftests/gpio/gpio-line-name.c | 55 ++
tools/testing/selftests/gpio/gpio-sim.sh | 229 +++++
15 files changed, 1743 insertions(+), 23 deletions(-)
create mode 100644 Documentation/admin-guide/gpio/gpio-sim.rst
create mode 100644 drivers/gpio/gpio-sim.c
create mode 100644 tools/testing/selftests/gpio/gpio-chip-info.c
create mode 100644 tools/testing/selftests/gpio/gpio-line-name.c
create mode 100755 tools/testing/selftests/gpio/gpio-sim.sh
--
2.30.1
