#include <linux/input.h>
#include <linux/uaccess.h>
#include <linux/moduleparam.h>
+#include <linux/jiffies.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>
static int __read_mostly sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
static bool __read_mostly sysrq_always_enabled;
+unsigned short platform_sysrq_reset_seq[] __weak = { KEY_RESERVED };
+int sysrq_reset_downtime_ms __weak;
+
static bool sysrq_on(void)
{
return sysrq_enabled || sysrq_always_enabled;
}
static struct sysrq_key_op sysrq_SAK_op = {
.handler = sysrq_handle_SAK,
- .help_msg = "saK",
+ .help_msg = "sak(k)",
.action_msg = "SAK",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
static struct sysrq_key_op sysrq_unraw_op = {
.handler = sysrq_handle_unraw,
- .help_msg = "unRaw",
+ .help_msg = "unraw(r)",
.action_msg = "Keyboard mode set to system default",
.enable_mask = SYSRQ_ENABLE_KEYBOARD,
};
}
static struct sysrq_key_op sysrq_crash_op = {
.handler = sysrq_handle_crash,
- .help_msg = "Crash",
+ .help_msg = "crash(c)",
.action_msg = "Trigger a crash",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_reboot_op = {
.handler = sysrq_handle_reboot,
- .help_msg = "reBoot",
+ .help_msg = "reboot(b)",
.action_msg = "Resetting",
.enable_mask = SYSRQ_ENABLE_BOOT,
};
}
static struct sysrq_key_op sysrq_sync_op = {
.handler = sysrq_handle_sync,
- .help_msg = "Sync",
+ .help_msg = "sync(s)",
.action_msg = "Emergency Sync",
.enable_mask = SYSRQ_ENABLE_SYNC,
};
static struct sysrq_key_op sysrq_show_timers_op = {
.handler = sysrq_handle_show_timers,
- .help_msg = "show-all-timers(Q)",
+ .help_msg = "show-all-timers(q)",
.action_msg = "Show clockevent devices & pending hrtimers (no others)",
};
}
static struct sysrq_key_op sysrq_mountro_op = {
.handler = sysrq_handle_mountro,
- .help_msg = "Unmount",
+ .help_msg = "unmount(u)",
.action_msg = "Emergency Remount R/O",
.enable_mask = SYSRQ_ENABLE_REMOUNT,
};
static struct sysrq_key_op sysrq_showlocks_op = {
.handler = sysrq_handle_showlocks,
- .help_msg = "show-all-locks(D)",
+ .help_msg = "show-all-locks(d)",
.action_msg = "Show Locks Held",
};
#else
static struct sysrq_key_op sysrq_showallcpus_op = {
.handler = sysrq_handle_showallcpus,
- .help_msg = "show-backtrace-all-active-cpus(L)",
+ .help_msg = "show-backtrace-all-active-cpus(l)",
.action_msg = "Show backtrace of all active CPUs",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showregs_op = {
.handler = sysrq_handle_showregs,
- .help_msg = "show-registers(P)",
+ .help_msg = "show-registers(p)",
.action_msg = "Show Regs",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showstate_op = {
.handler = sysrq_handle_showstate,
- .help_msg = "show-task-states(T)",
+ .help_msg = "show-task-states(t)",
.action_msg = "Show State",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showstate_blocked_op = {
.handler = sysrq_handle_showstate_blocked,
- .help_msg = "show-blocked-tasks(W)",
+ .help_msg = "show-blocked-tasks(w)",
.action_msg = "Show Blocked State",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_ftrace_dump_op = {
.handler = sysrq_ftrace_dump,
- .help_msg = "dump-ftrace-buffer(Z)",
+ .help_msg = "dump-ftrace-buffer(z)",
.action_msg = "Dump ftrace buffer",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_showmem_op = {
.handler = sysrq_handle_showmem,
- .help_msg = "show-memory-usage(M)",
+ .help_msg = "show-memory-usage(m)",
.action_msg = "Show Memory",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
}
static struct sysrq_key_op sysrq_term_op = {
.handler = sysrq_handle_term,
- .help_msg = "terminate-all-tasks(E)",
+ .help_msg = "terminate-all-tasks(e)",
.action_msg = "Terminate All Tasks",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_moom_op = {
.handler = sysrq_handle_moom,
- .help_msg = "memory-full-oom-kill(F)",
+ .help_msg = "memory-full-oom-kill(f)",
.action_msg = "Manual OOM execution",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_thaw_op = {
.handler = sysrq_handle_thaw,
- .help_msg = "thaw-filesystems(J)",
+ .help_msg = "thaw-filesystems(j)",
.action_msg = "Emergency Thaw of all frozen filesystems",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_kill_op = {
.handler = sysrq_handle_kill,
- .help_msg = "kill-all-tasks(I)",
+ .help_msg = "kill-all-tasks(i)",
.action_msg = "Kill All Tasks",
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
}
static struct sysrq_key_op sysrq_unrt_op = {
.handler = sysrq_handle_unrt,
- .help_msg = "nice-all-RT-tasks(N)",
+ .help_msg = "nice-all-RT-tasks(n)",
.action_msg = "Nice All RT Tasks",
.enable_mask = SYSRQ_ENABLE_RTNICE,
};
int reset_seq_len;
int reset_seq_cnt;
int reset_seq_version;
+ struct timer_list keyreset_timer;
};
#define SYSRQ_KEY_RESET_MAX 20 /* Should be plenty */
state->reset_seq_version = sysrq_reset_seq_version;
}
-static bool sysrq_detect_reset_sequence(struct sysrq_state *state,
+static void sysrq_do_reset(unsigned long dummy)
+{
+ __handle_sysrq(sysrq_xlate[KEY_B], false);
+}
+
+static void sysrq_handle_reset_request(struct sysrq_state *state)
+{
+ if (sysrq_reset_downtime_ms)
+ mod_timer(&state->keyreset_timer,
+ jiffies + msecs_to_jiffies(sysrq_reset_downtime_ms));
+ else
+ sysrq_do_reset(0);
+}
+
+static void sysrq_detect_reset_sequence(struct sysrq_state *state,
unsigned int code, int value)
{
if (!test_bit(code, state->reset_keybit)) {
/*
* Pressing any key _not_ in reset sequence cancels
- * the reset sequence.
+ * the reset sequence. Also cancelling the timer in
+ * case additional keys were pressed after a reset
+ * has been requested.
*/
- if (value && state->reset_seq_cnt)
+ if (value && state->reset_seq_cnt) {
state->reset_canceled = true;
+ del_timer(&state->keyreset_timer);
+ }
} else if (value == 0) {
- /* key release */
+ /*
+ * Key release - all keys in the reset sequence need
+ * to be pressed and held for the reset timeout
+ * to hold.
+ */
+ del_timer(&state->keyreset_timer);
+
if (--state->reset_seq_cnt == 0)
state->reset_canceled = false;
} else if (value == 1) {
/* key press, not autorepeat */
if (++state->reset_seq_cnt == state->reset_seq_len &&
!state->reset_canceled) {
- return true;
+ sysrq_handle_reset_request(state);
}
}
-
- return false;
}
static void sysrq_reinject_alt_sysrq(struct work_struct *work)
if (was_active)
schedule_work(&sysrq->reinject_work);
- if (sysrq_detect_reset_sequence(sysrq, code, value)) {
- /* Force emergency reboot */
- __handle_sysrq(sysrq_xlate[KEY_B], false);
- }
+ /* Check for reset sequence */
+ sysrq_detect_reset_sequence(sysrq, code, value);
} else if (value == 0 && test_and_clear_bit(code, sysrq->key_down)) {
/*
sysrq->handle.handler = handler;
sysrq->handle.name = "sysrq";
sysrq->handle.private = sysrq;
+ setup_timer(&sysrq->keyreset_timer, sysrq_do_reset, 0);
error = input_register_handle(&sysrq->handle);
if (error) {
input_close_device(handle);
cancel_work_sync(&sysrq->reinject_work);
+ del_timer_sync(&sysrq->keyreset_timer);
input_unregister_handle(handle);
kfree(sysrq);
}
static bool sysrq_handler_registered;
-unsigned short platform_sysrq_reset_seq[] __weak = { KEY_RESERVED };
-
static inline void sysrq_register_handler(void)
{
unsigned short key;
module_param_array_named(reset_seq, sysrq_reset_seq, sysrq_reset_seq,
&sysrq_reset_seq_len, 0644);
+module_param_named(sysrq_downtime_ms, sysrq_reset_downtime_ms, int, 0644);
+
#else
static inline void sysrq_register_handler(void)
projects / cascardo / linux.git / blobdiff