Lines Matching +full:key +full:- +full:release
1 // SPDX-License-Identifier: GPL-2.0
3 * Linux Magic System Request Key Hacks
9 * overhauled to use key registration
68 * sysrq_mask - Getter for sysrq_enabled mask.
101 static void sysrq_handle_loglevel(int key) in sysrq_handle_loglevel() argument
105 i = key - '0'; in sysrq_handle_loglevel()
112 .help_msg = "loglevel(0-9)",
118 static void sysrq_handle_SAK(int key) in sysrq_handle_SAK() argument
134 static void sysrq_handle_unraw(int key) in sysrq_handle_unraw() argument
149 static void sysrq_handle_crash(int key) in sysrq_handle_crash() argument
151 /* release the RCU read lock before crashing */ in sysrq_handle_crash()
163 static void sysrq_handle_reboot(int key) in sysrq_handle_reboot() argument
178 static void sysrq_handle_sync(int key) in sysrq_handle_sync() argument
189 static void sysrq_handle_show_timers(int key) in sysrq_handle_show_timers() argument
196 .help_msg = "show-all-timers(q)",
200 static void sysrq_handle_mountro(int key) in sysrq_handle_mountro() argument
212 static void sysrq_handle_showlocks(int key) in sysrq_handle_showlocks() argument
219 .help_msg = "show-all-locks(d)",
252 static void sysrq_handle_showallcpus(int key) in sysrq_handle_showallcpus() argument
278 .help_msg = "show-backtrace-all-active-cpus(l)",
284 static void sysrq_handle_showregs(int key) in sysrq_handle_showregs() argument
296 .help_msg = "show-registers(p)",
301 static void sysrq_handle_showstate(int key) in sysrq_handle_showstate() argument
308 .help_msg = "show-task-states(t)",
313 static void sysrq_handle_showstate_blocked(int key) in sysrq_handle_showstate_blocked() argument
319 .help_msg = "show-blocked-tasks(w)",
327 static void sysrq_ftrace_dump(int key) in sysrq_ftrace_dump() argument
333 .help_msg = "dump-ftrace-buffer(z)",
341 static void sysrq_handle_showmem(int key) in sysrq_handle_showmem() argument
347 .help_msg = "show-memory-usage(m)",
361 if (p->flags & PF_KTHREAD) in send_sig_all()
371 static void sysrq_handle_term(int key) in sysrq_handle_term() argument
378 .help_msg = "terminate-all-tasks(e)",
391 .order = -1, in moom_callback()
402 static void sysrq_handle_moom(int key) in sysrq_handle_moom() argument
408 .help_msg = "memory-full-oom-kill(f)",
413 static void sysrq_handle_thaw(int key) in sysrq_handle_thaw() argument
419 .help_msg = "thaw-filesystems(j)",
424 static void sysrq_handle_kill(int key) in sysrq_handle_kill() argument
431 .help_msg = "kill-all-tasks(i)",
436 static void sysrq_handle_unrt(int key) in sysrq_handle_unrt() argument
442 .help_msg = "nice-all-RT-tasks(n)",
447 /* Key Operations table and lock */
474 NULL, /* h - reserved for help */
535 /* key2index calculation, -1 on invalid index */
536 static int sysrq_key_table_key2index(int key) in sysrq_key_table_key2index() argument
540 if ((key >= '0') && (key <= '9')) in sysrq_key_table_key2index()
541 retval = key - '0'; in sysrq_key_table_key2index()
542 else if ((key >= 'a') && (key <= 'z')) in sysrq_key_table_key2index()
543 retval = key + 10 - 'a'; in sysrq_key_table_key2index()
544 else if ((key >= 'A') && (key <= 'Z')) in sysrq_key_table_key2index()
545 retval = key + 36 - 'A'; in sysrq_key_table_key2index()
547 retval = -1; in sysrq_key_table_key2index()
554 static const struct sysrq_key_op *__sysrq_get_key_op(int key) in __sysrq_get_key_op() argument
559 i = sysrq_key_table_key2index(key); in __sysrq_get_key_op()
560 if (i != -1) in __sysrq_get_key_op()
566 static void __sysrq_put_key_op(int key, const struct sysrq_key_op *op_p) in __sysrq_put_key_op() argument
568 int i = sysrq_key_table_key2index(key); in __sysrq_put_key_op()
570 if (i != -1) in __sysrq_put_key_op()
574 void __handle_sysrq(int key, bool check_mask) in __handle_sysrq() argument
595 op_p = __sysrq_get_key_op(key); in __handle_sysrq()
598 * Should we check for enabled operations (/proc/sysrq-trigger in __handle_sysrq()
601 if (!check_mask || sysrq_on_mask(op_p->enable_mask)) { in __handle_sysrq()
602 pr_info("%s\n", op_p->action_msg); in __handle_sysrq()
604 op_p->handler(key); in __handle_sysrq()
621 pr_cont("%s ", sysrq_key_table[i]->help_msg); in __handle_sysrq()
633 void handle_sysrq(int key) in handle_sysrq() argument
636 __handle_sysrq(key, true); in handle_sysrq()
645 "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
646 "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
647 "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
648 "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
649 "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
650 "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
651 "\r\000/"; /* 0x60 - 0x6f */
683 unsigned short key; in sysrq_parse_reset_sequence() local
685 state->reset_seq_cnt = 0; in sysrq_parse_reset_sequence()
688 key = sysrq_reset_seq[i]; in sysrq_parse_reset_sequence()
690 if (key == KEY_RESERVED || key > KEY_MAX) in sysrq_parse_reset_sequence()
693 __set_bit(key, state->reset_keybit); in sysrq_parse_reset_sequence()
694 state->reset_seq_len++; in sysrq_parse_reset_sequence()
696 if (test_bit(key, state->key_down)) in sysrq_parse_reset_sequence()
697 state->reset_seq_cnt++; in sysrq_parse_reset_sequence()
701 state->reset_canceled = state->reset_seq_cnt != 0; in sysrq_parse_reset_sequence()
703 state->reset_seq_version = sysrq_reset_seq_version; in sysrq_parse_reset_sequence()
710 state->reset_requested = true; in sysrq_do_reset()
717 if (state->reset_requested) in sysrq_handle_reset_request()
721 mod_timer(&state->keyreset_timer, in sysrq_handle_reset_request()
724 sysrq_do_reset(&state->keyreset_timer); in sysrq_handle_reset_request()
730 if (!test_bit(code, state->reset_keybit)) { in sysrq_detect_reset_sequence()
732 * Pressing any key _not_ in reset sequence cancels in sysrq_detect_reset_sequence()
737 if (value && state->reset_seq_cnt) { in sysrq_detect_reset_sequence()
738 state->reset_canceled = true; in sysrq_detect_reset_sequence()
739 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
743 * Key release - all keys in the reset sequence need in sysrq_detect_reset_sequence()
747 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
749 if (--state->reset_seq_cnt == 0) in sysrq_detect_reset_sequence()
750 state->reset_canceled = false; in sysrq_detect_reset_sequence()
752 /* key press, not autorepeat */ in sysrq_detect_reset_sequence()
753 if (++state->reset_seq_cnt == state->reset_seq_len && in sysrq_detect_reset_sequence()
754 !state->reset_canceled) { in sysrq_detect_reset_sequence()
763 u32 key; in sysrq_of_get_keyreset_config() local
768 np = of_find_node_by_path("/chosen/linux,sysrq-reset-seq"); in sysrq_of_get_keyreset_config()
777 of_property_for_each_u32(np, "keyset", prop, p, key) { in sysrq_of_get_keyreset_config()
778 if (key == KEY_RESERVED || key > KEY_MAX || in sysrq_of_get_keyreset_config()
782 sysrq_reset_seq[sysrq_reset_seq_len++] = (unsigned short)key; in sysrq_of_get_keyreset_config()
786 of_property_read_u32(np, "timeout-ms", &sysrq_reset_downtime_ms); in sysrq_of_get_keyreset_config()
800 struct input_handle *handle = &sysrq->handle; in sysrq_reinject_alt_sysrq()
801 unsigned int alt_code = sysrq->alt_use; in sysrq_reinject_alt_sysrq()
803 if (sysrq->need_reinject) { in sysrq_reinject_alt_sysrq()
805 sysrq->reinjecting = true; in sysrq_reinject_alt_sysrq()
808 /* Simulate press and release of Alt + SysRq */ in sysrq_reinject_alt_sysrq()
818 sysrq->reinjecting = false; in sysrq_reinject_alt_sysrq()
825 bool was_active = sysrq->active; in sysrq_handle_keypress()
834 if (sysrq->active && code == sysrq->alt_use) in sysrq_handle_keypress()
835 sysrq->active = false; in sysrq_handle_keypress()
837 sysrq->alt = KEY_RESERVED; in sysrq_handle_keypress()
840 sysrq->alt = code; in sysrq_handle_keypress()
841 sysrq->need_reinject = false; in sysrq_handle_keypress()
848 sysrq->shift = KEY_RESERVED; in sysrq_handle_keypress()
850 sysrq->shift = code; in sysrq_handle_keypress()
854 if (value == 1 && sysrq->alt != KEY_RESERVED) { in sysrq_handle_keypress()
855 sysrq->active = true; in sysrq_handle_keypress()
856 sysrq->alt_use = sysrq->alt; in sysrq_handle_keypress()
858 sysrq->shift_use = sysrq->shift; in sysrq_handle_keypress()
861 * to re-inject Alt-SysRq keysroke. in sysrq_handle_keypress()
863 sysrq->need_reinject = true; in sysrq_handle_keypress()
869 * to release all keys after exiting debugger. If we in sysrq_handle_keypress()
870 * do not clear key bit it KGDB will end up sending in sysrq_handle_keypress()
871 * release events for Alt and SysRq, potentially in sysrq_handle_keypress()
874 if (sysrq->active) in sysrq_handle_keypress()
875 clear_bit(KEY_SYSRQ, sysrq->handle.dev->key); in sysrq_handle_keypress()
880 if (sysrq->active && value && value != 2) { in sysrq_handle_keypress()
883 sysrq->need_reinject = false; in sysrq_handle_keypress()
884 if (sysrq->shift_use != KEY_RESERVED) in sysrq_handle_keypress()
891 suppress = sysrq->active; in sysrq_handle_keypress()
893 if (!sysrq->active) { in sysrq_handle_keypress()
898 if (sysrq->reset_seq_version != sysrq_reset_seq_version) in sysrq_handle_keypress()
902 * If we are not suppressing key presses keep track of in sysrq_handle_keypress()
903 * keyboard state so we can release keys that have been in sysrq_handle_keypress()
907 set_bit(code, sysrq->key_down); in sysrq_handle_keypress()
909 clear_bit(code, sysrq->key_down); in sysrq_handle_keypress()
912 schedule_work(&sysrq->reinject_work); in sysrq_handle_keypress()
917 } else if (value == 0 && test_and_clear_bit(code, sysrq->key_down)) { in sysrq_handle_keypress()
919 * Pass on release events for keys that was pressed before in sysrq_handle_keypress()
931 struct sysrq_state *sysrq = handle->private; in sysrq_filter()
935 * Do not filter anything if we are in the process of re-injecting in sysrq_filter()
938 if (sysrq->reinjecting) in sysrq_filter()
952 suppress = sysrq->active; in sysrq_filter()
968 return -ENOMEM; in sysrq_connect()
970 INIT_WORK(&sysrq->reinject_work, sysrq_reinject_alt_sysrq); in sysrq_connect()
972 sysrq->handle.dev = dev; in sysrq_connect()
973 sysrq->handle.handler = handler; in sysrq_connect()
974 sysrq->handle.name = "sysrq"; in sysrq_connect()
975 sysrq->handle.private = sysrq; in sysrq_connect()
976 timer_setup(&sysrq->keyreset_timer, sysrq_do_reset, 0); in sysrq_connect()
978 error = input_register_handle(&sysrq->handle); in sysrq_connect()
985 error = input_open_device(&sysrq->handle); in sysrq_connect()
994 input_unregister_handle(&sysrq->handle); in sysrq_connect()
1002 struct sysrq_state *sysrq = handle->private; in sysrq_disconnect()
1005 cancel_work_sync(&sysrq->reinject_work); in sysrq_disconnect()
1006 del_timer_sync(&sysrq->keyreset_timer); in sysrq_disconnect()
1013 * keyboards have SysRq key predefined and so user may add it to keymap
1061 return -EINVAL; in sysrq_reset_seq_param_set()
1063 *((unsigned short *)kp->arg) = val; in sysrq_reset_seq_param_set()
1115 static int __sysrq_swap_key_ops(int key, const struct sysrq_key_op *insert_op_p, in __sysrq_swap_key_ops() argument
1121 if (__sysrq_get_key_op(key) == remove_op_p) { in __sysrq_swap_key_ops()
1122 __sysrq_put_key_op(key, insert_op_p); in __sysrq_swap_key_ops()
1125 retval = -1; in __sysrq_swap_key_ops()
1139 int register_sysrq_key(int key, const struct sysrq_key_op *op_p) in register_sysrq_key() argument
1141 return __sysrq_swap_key_ops(key, op_p, NULL); in register_sysrq_key()
1145 int unregister_sysrq_key(int key, const struct sysrq_key_op *op_p) in unregister_sysrq_key() argument
1147 return __sysrq_swap_key_ops(key, NULL, op_p); in unregister_sysrq_key()
1156 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
1165 return -EFAULT; in write_sysrq_trigger()
1182 if (!proc_create("sysrq-trigger", S_IWUSR, NULL, in sysrq_init_procfs()