* based upon discusions in irc://irc.openprojects.net/#kernelnewbies
*/
-#include <linux/config.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/vt_kern.h>
#include <linux/workqueue.h>
#include <linux/kexec.h>
+#include <linux/irq.h>
+#include <linux/vserver/debug.h>
#include <asm/ptrace.h>
+#include <asm/irq_regs.h>
/* Whether we react on sysrq keys or just ignore them */
-int sysrq_enabled = 1;
+int __read_mostly __sysrq_enabled = 1;
-static void sysrq_handle_loglevel(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static int __read_mostly sysrq_always_enabled;
+
+int sysrq_on(void)
+{
+ return __sysrq_enabled || sysrq_always_enabled;
+}
+
+/*
+ * A value of 1 means 'all', other nonzero values are an op mask:
+ */
+static inline int sysrq_on_mask(int mask)
+{
+ return sysrq_always_enabled || __sysrq_enabled == 1 ||
+ (__sysrq_enabled & mask);
+}
+
+static int __init sysrq_always_enabled_setup(char *str)
+{
+ sysrq_always_enabled = 1;
+ printk(KERN_INFO "debug: sysrq always enabled.\n");
+
+ return 1;
+}
+
+__setup("sysrq_always_enabled", sysrq_always_enabled_setup);
+
+
+static void sysrq_handle_loglevel(int key, struct tty_struct *tty)
{
int i;
i = key - '0';
};
#ifdef CONFIG_VT
-static void sysrq_handle_SAK(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_SAK(int key, struct tty_struct *tty)
{
if (tty)
do_SAK(tty);
#endif
#ifdef CONFIG_VT
-static void sysrq_handle_unraw(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_unraw(int key, struct tty_struct *tty)
{
struct kbd_struct *kbd = &kbd_table[fg_console];
#define sysrq_unraw_op (*(struct sysrq_key_op *)0)
#endif /* CONFIG_VT */
-#ifdef CONFIG_KEXEC
-static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_crashdump(int key, struct tty_struct *tty)
{
- crash_kexec(pt_regs);
+#ifdef CONFIG_KEXEC
+ crash_kexec(get_irq_regs());
+ /* can't get here if crash image is loaded */
+ printk("Kexec: Warning: crash image not loaded\n");
+#endif
+ if (panic_on_oops)
+ panic("SysRq-triggered panic!\n");
}
static struct sysrq_key_op sysrq_crashdump_op = {
.handler = sysrq_handle_crashdump,
.action_msg = "Trigger a crashdump",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
-#else
-#define sysrq_crashdump_op (*(struct sysrq_key_op *)0)
-#endif
-static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_reboot(int key, struct tty_struct *tty)
{
+ lockdep_off();
local_irq_enable();
emergency_restart();
}
.enable_mask = SYSRQ_ENABLE_BOOT,
};
-static void sysrq_handle_sync(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_sync(int key, struct tty_struct *tty)
{
emergency_sync();
}
.enable_mask = SYSRQ_ENABLE_SYNC,
};
-static void sysrq_handle_mountro(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_mountro(int key, struct tty_struct *tty)
{
emergency_remount();
}
.enable_mask = SYSRQ_ENABLE_REMOUNT,
};
-#ifdef CONFIG_DEBUG_MUTEXES
-static void sysrq_handle_showlocks(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+#ifdef CONFIG_LOCKDEP
+static void sysrq_handle_showlocks(int key, struct tty_struct *tty)
{
- mutex_debug_show_all_locks();
+ debug_show_all_locks();
}
+
static struct sysrq_key_op sysrq_showlocks_op = {
.handler = sysrq_handle_showlocks,
.help_msg = "show-all-locks(D)",
#define sysrq_showlocks_op (*(struct sysrq_key_op *)0)
#endif
-static void sysrq_handle_showregs(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_showregs(int key, struct tty_struct *tty)
{
- if (pt_regs)
- show_regs(pt_regs);
+ struct pt_regs *regs = get_irq_regs();
+ if (regs)
+ show_regs(regs);
}
static struct sysrq_key_op sysrq_showregs_op = {
.handler = sysrq_handle_showregs,
.enable_mask = SYSRQ_ENABLE_DUMP,
};
-static void sysrq_handle_showstate(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_showstate(int key, struct tty_struct *tty)
{
show_state();
}
.enable_mask = SYSRQ_ENABLE_DUMP,
};
-static void sysrq_handle_showmem(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_showstate_blocked(int key, struct tty_struct *tty)
+{
+ show_state_filter(TASK_UNINTERRUPTIBLE);
+}
+static struct sysrq_key_op sysrq_showstate_blocked_op = {
+ .handler = sysrq_handle_showstate_blocked,
+ .help_msg = "shoW-blocked-tasks",
+ .action_msg = "Show Blocked State",
+ .enable_mask = SYSRQ_ENABLE_DUMP,
+};
+
+
+static void sysrq_handle_showmem(int key, struct tty_struct *tty)
{
show_mem();
}
struct task_struct *p;
for_each_process(p) {
- if (p->mm && p->pid != 1)
+ if (p->mm && !is_init(p))
/* Not swapper, init nor kernel thread */
force_sig(sig, p);
}
}
-static void sysrq_handle_term(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_term(int key, struct tty_struct *tty)
{
send_sig_all(SIGTERM);
console_loglevel = 8;
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
-static void moom_callback(void *ignored)
+static void moom_callback(struct work_struct *ignored)
{
out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL],
GFP_KERNEL, 0);
}
-static DECLARE_WORK(moom_work, moom_callback, NULL);
+static DECLARE_WORK(moom_work, moom_callback);
-static void sysrq_handle_moom(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_moom(int key, struct tty_struct *tty)
{
schedule_work(&moom_work);
}
.action_msg = "Manual OOM execution",
};
-static void sysrq_handle_kill(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_kill(int key, struct tty_struct *tty)
{
send_sig_all(SIGKILL);
console_loglevel = 8;
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
-static void sysrq_handle_unrt(int key, struct pt_regs *pt_regs,
- struct tty_struct *tty)
+static void sysrq_handle_unrt(int key, struct tty_struct *tty)
{
normalize_rt_tasks();
}
.enable_mask = SYSRQ_ENABLE_RTNICE,
};
+
+#ifdef CONFIG_VSERVER_DEBUG
+static void sysrq_handle_vxinfo(int key, struct tty_struct *tty)
+{
+ dump_vx_info_inactive((key == 'x')?0:1);
+}
+
+static struct sysrq_key_op sysrq_showvxinfo_op = {
+ .handler = sysrq_handle_vxinfo,
+ .help_msg = "conteXt",
+ .action_msg = "Show Context Info",
+ .enable_mask = SYSRQ_ENABLE_DUMP,
+};
+#endif
+
/* Key Operations table and lock */
static DEFINE_SPINLOCK(sysrq_key_table_lock);
&sysrq_loglevel_op, /* 9 */
/*
- * Don't use for system provided sysrqs, it is handled specially on
- * sparc and will never arrive
+ * a: Don't use for system provided sysrqs, it is handled specially on
+ * sparc and will never arrive.
*/
NULL, /* a */
&sysrq_reboot_op, /* b */
- &sysrq_crashdump_op, /* c */
+ &sysrq_crashdump_op, /* c & ibm_emac driver debug */
&sysrq_showlocks_op, /* d */
&sysrq_term_op, /* e */
&sysrq_moom_op, /* f */
+ /* g: May be registered by ppc for kgdb */
NULL, /* g */
NULL, /* h */
&sysrq_kill_op, /* i */
NULL, /* l */
&sysrq_showmem_op, /* m */
&sysrq_unrt_op, /* n */
- /* This will often be registered as 'Off' at init time */
+ /* o: This will often be registered as 'Off' at init time */
NULL, /* o */
&sysrq_showregs_op, /* p */
NULL, /* q */
- &sysrq_unraw_op, /* r */
+ &sysrq_unraw_op, /* r */
&sysrq_sync_op, /* s */
&sysrq_showstate_op, /* t */
&sysrq_mountro_op, /* u */
- /* May be assigned at init time by SMP VOYAGER */
+ /* v: May be registered at init time by SMP VOYAGER */
NULL, /* v */
- NULL, /* w */
+ &sysrq_showstate_blocked_op, /* w */
+ /* x: May be registered on ppc/powerpc for xmon */
NULL, /* x */
NULL, /* y */
- NULL /* z */
+#ifdef CONFIG_VSERVER_DEBUG
+ &sysrq_showvxinfo_op, /* z */
+#else
+ NULL, /* z */
+#endif
};
/* key2index calculation, -1 on invalid index */
retval = key - '0';
else if ((key >= 'a') && (key <= 'z'))
retval = key + 10 - 'a';
+ else if ((key >= 'A') && (key <= 'Z'))
+ retval = key + 10 - 'A';
else
retval = -1;
return retval;
* This is the non-locking version of handle_sysrq. It must/can only be called
* by sysrq key handlers, as they are inside of the lock
*/
-void __handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty,
- int check_mask)
+void __handle_sysrq(int key, struct tty_struct *tty, int check_mask)
{
struct sysrq_key_op *op_p;
int orig_log_level;
* Should we check for enabled operations (/proc/sysrq-trigger
* should not) and is the invoked operation enabled?
*/
- if (!check_mask || sysrq_enabled == 1 ||
- (sysrq_enabled & op_p->enable_mask)) {
+ if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
printk("%s\n", op_p->action_msg);
console_loglevel = orig_log_level;
- op_p->handler(key, pt_regs, tty);
+ op_p->handler(key, tty);
} else {
printk("This sysrq operation is disabled.\n");
}
* This function is called by the keyboard handler when SysRq is pressed
* and any other keycode arrives.
*/
-void handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
+void handle_sysrq(int key, struct tty_struct *tty)
{
- if (!sysrq_enabled)
- return;
- __handle_sysrq(key, pt_regs, tty, 1);
+ if (sysrq_on())
+ __handle_sysrq(key, tty, 1);
}
EXPORT_SYMBOL(handle_sysrq);
git://git.onelab.eu / linux-2.6.git / blobdiff