From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- Documentation/ABI/testing/sysfs-class-extcon | 101 +++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-extcon (limited to 'Documentation/ABI/testing/sysfs-class-extcon') diff --git a/Documentation/ABI/testing/sysfs-class-extcon b/Documentation/ABI/testing/sysfs-class-extcon new file mode 100644 index 000000000..f8e705375 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-extcon @@ -0,0 +1,101 @@ +What: /sys/class/extcon/.../ +Date: February 2012 +Contact: MyungJoo Ham +Description: + Provide a place in sysfs for the extcon objects. + This allows accessing extcon specific variables. + The name of extcon object denoted as ... is the name given + with extcon_dev_register. + + One extcon device denotes a single external connector + port. An external connector may have multiple cables + attached simultaneously. Many of docks, cradles, and + accessory cables have such capability. For example, + the 30-pin port of Nuri board (/arch/arm/mach-exynos) + may have both HDMI and Charger attached, or analog audio, + video, and USB cables attached simultaneously. + + If there are cables mutually exclusive with each other, + such binary relations may be expressed with extcon_dev's + mutually_exclusive array. + +What: /sys/class/extcon/.../name +Date: February 2012 +Contact: MyungJoo Ham +Description: + The /sys/class/extcon/.../name shows the name of the extcon + object. If the extcon object has an optional callback + "show_name" defined, the callback will provide the name with + this sysfs node. + +What: /sys/class/extcon/.../state +Date: February 2012 +Contact: MyungJoo Ham +Description: + The /sys/class/extcon/.../state shows and stores the cable + attach/detach information of the corresponding extcon object. + If the extcon object has an optional callback "show_state" + defined, the showing function is overridden with the optional + callback. + + If the default callback for showing function is used, the + format is like this:: + + # cat state + USB_OTG=1 + HDMI=0 + TA=1 + EAR_JACK=0 + # + + In this example, the extcon device has USB_OTG and TA + cables attached and HDMI and EAR_JACK cables detached. + + In order to update the state of an extcon device, enter a hex + state number starting with 0x:: + + # echo 0xHEX > state + + This updates the whole state of the extcon device. + Inputs of all the methods are required to meet the + mutually_exclusive conditions if they exist. + + It is recommended to use this "global" state interface if + you need to set the value atomically. The later state + interface associated with each cable cannot update + multiple cable states of an extcon device simultaneously. + +What: /sys/class/extcon/.../cable.X/name +Date: February 2012 +Contact: MyungJoo Ham +Description: + The /sys/class/extcon/.../cable.X/name shows the name of cable + "X" (integer between 0 and 31) of an extcon device. + +What: /sys/class/extcon/.../cable.X/state +Date: February 2012 +Contact: MyungJoo Ham +Description: + The /sys/class/extcon/.../cable.X/state shows and stores the + state of cable "X" (integer between 0 and 31) of an extcon + device. The state value is either 0 (detached) or 1 + (attached). + +What: /sys/class/extcon/.../mutually_exclusive/... +Date: December 2011 +Contact: MyungJoo Ham +Description: + Shows the relations of mutually exclusiveness. For example, + if the mutually_exclusive array of extcon device is + {0x3, 0x5, 0xC, 0x0}, then the output is:: + + # ls mutually_exclusive/ + 0x3 + 0x5 + 0xc + # + + Note that mutually_exclusive is a sub-directory of the extcon + device and the file names under the mutually_exclusive + directory show the mutually-exclusive sets, not the contents + of the files. -- cgit v1.3.1