From cf9610f9116d55c5a66ef9f1faecacabd93a9322 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 24 Aug 2026 08:46:03 -0700 Subject: Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ... --- samples/livepatch/livepatch-callbacks-demo.c | 197 +++++++++++++++++++++++++++ 1 file changed, 197 insertions(+) create mode 100644 samples/livepatch/livepatch-callbacks-demo.c (limited to 'samples/livepatch/livepatch-callbacks-demo.c') diff --git a/samples/livepatch/livepatch-callbacks-demo.c b/samples/livepatch/livepatch-callbacks-demo.c new file mode 100644 index 000000000..9e69d9cae --- /dev/null +++ b/samples/livepatch/livepatch-callbacks-demo.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2017 Joe Lawrence + */ + +/* + * livepatch-callbacks-demo.c - (un)patching callbacks livepatch demo + * + * + * Purpose + * ------- + * + * Demonstration of registering livepatch (un)patching callbacks. + * + * + * Usage + * ----- + * + * Step 1 - load the simple module + * + * insmod samples/livepatch/livepatch-callbacks-mod.ko + * + * + * Step 2 - load the demonstration livepatch (with callbacks) + * + * insmod samples/livepatch/livepatch-callbacks-demo.ko + * + * + * Step 3 - cleanup + * + * echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled + * rmmod livepatch_callbacks_demo + * rmmod livepatch_callbacks_mod + * + * Watch dmesg output to see livepatch enablement, callback execution + * and patching operations for both vmlinux and module targets. + * + * NOTE: swap the insmod order of livepatch-callbacks-mod.ko and + * livepatch-callbacks-demo.ko to observe what happens when a + * target module is loaded after a livepatch with callbacks. + * + * NOTE: 'pre_patch_ret' is a module parameter that sets the pre-patch + * callback return status. Try setting up a non-zero status + * such as -19 (-ENODEV): + * + * # Load demo livepatch, vmlinux is patched + * insmod samples/livepatch/livepatch-callbacks-demo.ko + * + * # Setup next pre-patch callback to return -ENODEV + * echo -19 > /sys/module/livepatch_callbacks_demo/parameters/pre_patch_ret + * + * # Module loader refuses to load the target module + * insmod samples/livepatch/livepatch-callbacks-mod.ko + * insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-mod.ko: No such device + * + * NOTE: There is a second target module, + * livepatch-callbacks-busymod.ko, available for experimenting + * with livepatch (un)patch callbacks. This module contains + * a 'sleep_secs' parameter that parks the module on one of the + * functions that the livepatch demo module wants to patch. + * Modifying this value and tweaking the order of module loads can + * effectively demonstrate stalled patch transitions: + * + * # Load a target module, let it park on 'busymod_work_func' for + * # thirty seconds + * insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=30 + * + * # Meanwhile load the livepatch + * insmod samples/livepatch/livepatch-callbacks-demo.ko + * + * # ... then load and unload another target module while the + * # transition is in progress + * insmod samples/livepatch/livepatch-callbacks-mod.ko + * rmmod samples/livepatch/livepatch-callbacks-mod.ko + * + * # Finally cleanup + * echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled + * rmmod samples/livepatch/livepatch-callbacks-demo.ko + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include + +static int pre_patch_ret; +module_param(pre_patch_ret, int, 0644); +MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)"); + +static const char *const module_state[] = { + [MODULE_STATE_LIVE] = "[MODULE_STATE_LIVE] Normal state", + [MODULE_STATE_COMING] = "[MODULE_STATE_COMING] Full formed, running module_init", + [MODULE_STATE_GOING] = "[MODULE_STATE_GOING] Going away", + [MODULE_STATE_UNFORMED] = "[MODULE_STATE_UNFORMED] Still setting it up", +}; + +static void callback_info(const char *callback, struct klp_object *obj) +{ + if (obj->mod) + pr_info("%s: %s -> %s\n", callback, obj->mod->name, + module_state[obj->mod->state]); + else + pr_info("%s: vmlinux\n", callback); +} + +/* Executed on object patching (ie, patch enablement) */ +static int pre_patch_callback(struct klp_object *obj) +{ + callback_info(__func__, obj); + return pre_patch_ret; +} + +/* Executed on object unpatching (ie, patch disablement) */ +static void post_patch_callback(struct klp_object *obj) +{ + callback_info(__func__, obj); +} + +/* Executed on object unpatching (ie, patch disablement) */ +static void pre_unpatch_callback(struct klp_object *obj) +{ + callback_info(__func__, obj); +} + +/* Executed on object unpatching (ie, patch disablement) */ +static void post_unpatch_callback(struct klp_object *obj) +{ + callback_info(__func__, obj); +} + +static void patched_work_func(struct work_struct *work) +{ + pr_info("%s\n", __func__); +} + +static struct klp_func no_funcs[] = { + { } +}; + +static struct klp_func busymod_funcs[] = { + { + .old_name = "busymod_work_func", + .new_func = patched_work_func, + }, { } +}; + +static struct klp_object objs[] = { + { + .name = NULL, /* vmlinux */ + .funcs = no_funcs, + .callbacks = { + .pre_patch = pre_patch_callback, + .post_patch = post_patch_callback, + .pre_unpatch = pre_unpatch_callback, + .post_unpatch = post_unpatch_callback, + }, + }, { + .name = "livepatch_callbacks_mod", + .funcs = no_funcs, + .callbacks = { + .pre_patch = pre_patch_callback, + .post_patch = post_patch_callback, + .pre_unpatch = pre_unpatch_callback, + .post_unpatch = post_unpatch_callback, + }, + }, { + .name = "livepatch_callbacks_busymod", + .funcs = busymod_funcs, + .callbacks = { + .pre_patch = pre_patch_callback, + .post_patch = post_patch_callback, + .pre_unpatch = pre_unpatch_callback, + .post_unpatch = post_unpatch_callback, + }, + }, { } +}; + +static struct klp_patch patch = { + .mod = THIS_MODULE, + .objs = objs, +}; + +static int livepatch_callbacks_demo_init(void) +{ + return klp_enable_patch(&patch); +} + +static void livepatch_callbacks_demo_exit(void) +{ +} + +module_init(livepatch_callbacks_demo_init); +module_exit(livepatch_callbacks_demo_exit); +MODULE_DESCRIPTION("Live patching demo for (un)patching callbacks"); +MODULE_LICENSE("GPL"); +MODULE_INFO(livepatch, "Y"); -- cgit v1.3.1