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/******************************************************************************
* keyhandler.c
*/
#include <asm/regs.h>
#include <xen/keyhandler.h>
#include <xen/shutdown.h>
#include <xen/event.h>
#include <xen/console.h>
#include <xen/serial.h>
#include <xen/sched.h>
#include <xen/tasklet.h>
#include <xen/domain.h>
#include <xen/rangeset.h>
#include <xen/compat.h>
#include <xen/ctype.h>
#include <xen/perfc.h>
#include <xen/mm.h>
#include <xen/nmi.h>
#include <xen/init.h>
#include <asm/debugger.h>
#include <asm/div64.h>
static struct keyhandler *key_table[256];
static unsigned char keypress_key;
static bool_t alt_key_handling;
char keyhandler_scratch[1024];
static void keypress_action(unsigned long unused)
{
handle_keypress(keypress_key, NULL);
}
static DECLARE_TASKLET(keypress_tasklet, keypress_action, 0);
void handle_keypress(unsigned char key, struct cpu_user_regs *regs)
{
struct keyhandler *h;
if ( (h = key_table[key]) == NULL )
return;
if ( !in_irq() || h->irq_callback )
{
console_start_log_everything();
h->irq_callback ? (*h->u.irq_fn)(key, regs) : (*h->u.fn)(key);
console_end_log_everything();
}
else
{
keypress_key = key;
tasklet_schedule(&keypress_tasklet);
}
}
void register_keyhandler(unsigned char key, struct keyhandler *handler)
{
ASSERT(key_table[key] == NULL);
key_table[key] = handler;
}
static void show_handlers(unsigned char key)
{
int i;
printk("'%c' pressed -> showing installed handlers\n", key);
for ( i = 0; i < ARRAY_SIZE(key_table); i++ )
if ( key_table[i] != NULL )
printk(" key '%c' (ascii '%02x') => %s\n",
isprint(i) ? i : ' ', i, key_table[i]->desc);
}
static struct keyhandler show_handlers_keyhandler = {
.u.fn = show_handlers,
.desc = "show this message"
};
static cpumask_t dump_execstate_mask;
void dump_execstate(struct cpu_user_regs *regs)
{
unsigned int cpu = smp_processor_id();
if ( !guest_mode(regs) )
{
printk("*** Dumping CPU%u host state: ***\n", cpu);
show_execution_state(regs);
}
if ( !is_idle_vcpu(current) )
{
printk("*** Dumping CPU%u guest state (d%d:v%d): ***\n",
smp_processor_id(), current->domain->domain_id,
current->vcpu_id);
show_execution_state(guest_cpu_user_regs());
printk("\n");
}
cpumask_clear_cpu(cpu, &dump_execstate_mask);
if ( !alt_key_handling )
return;
cpu = cpumask_cycle(cpu, &dump_execstate_mask);
if ( cpu < nr_cpu_ids )
{
smp_send_state_dump(cpu);
return;
}
console_end_sync();
watchdog_enable();
}
static void dump_registers(unsigned char key, struct cpu_user_regs *regs)
{
unsigned int cpu;
/* We want to get everything out that we possibly can. */
watchdog_disable();
console_start_sync();
printk("'%c' pressed -> dumping registers\n\n", key);
cpumask_copy(&dump_execstate_mask, &cpu_online_map);
/* Get local execution state out immediately, in case we get stuck. */
dump_execstate(regs);
/* Alt. handling: remaining CPUs are dumped asynchronously one-by-one. */
if ( alt_key_handling )
return;
/* Normal handling: synchronously dump the remaining CPUs' states. */
for_each_cpu ( cpu, &dump_execstate_mask )
{
smp_send_state_dump(cpu);
while ( cpumask_test_cpu(cpu, &dump_execstate_mask) )
cpu_relax();
}
console_end_sync();
watchdog_enable();
}
static struct keyhandler dump_registers_keyhandler = {
.irq_callback = 1,
.diagnostic = 1,
.u.irq_fn = dump_registers,
.desc = "dump registers"
};
static DECLARE_TASKLET(dump_dom0_tasklet, NULL, 0);
static void dump_dom0_action(unsigned long arg)
{
struct vcpu *v = (void *)arg;
for ( ; ; )
{
vcpu_show_execution_state(v);
if ( (v = v->next_in_list) == NULL )
break;
if ( softirq_pending(smp_processor_id()) )
{
dump_dom0_tasklet.data = (unsigned long)v;
tasklet_schedule_on_cpu(&dump_dom0_tasklet, v->processor);
break;
}
}
}
static void dump_dom0_registers(unsigned char key)
{
struct vcpu *v;
if ( dom0 == NULL )
return;
printk("'%c' pressed -> dumping Dom0's registers\n", key);
for_each_vcpu ( dom0, v )
{
if ( alt_key_handling && softirq_pending(smp_processor_id()) )
{
tasklet_kill(&dump_dom0_tasklet);
tasklet_init(&dump_dom0_tasklet, dump_dom0_action,
(unsigned long)v);
tasklet_schedule_on_cpu(&dump_dom0_tasklet, v->processor);
return;
}
vcpu_show_execution_state(v);
}
}
static struct keyhandler dump_dom0_registers_keyhandler = {
.diagnostic = 1,
.u.fn = dump_dom0_registers,
.desc = "dump Dom0 registers"
};
static void reboot_machine(unsigned char key, struct cpu_user_regs *regs)
{
printk("'%c' pressed -> rebooting machine\n", key);
machine_restart(0);
}
static struct keyhandler reboot_machine_keyhandler = {
.irq_callback = 1,
.u.irq_fn = reboot_machine,
.desc = "reboot machine"
};
static void cpuset_print(char *set, int size, const cpumask_t *mask)
{
*set++ = '{';
set += cpulist_scnprintf(set, size-2, mask);
*set++ = '}';
*set++ = '\0';
}
static void nodeset_print(char *set, int size, const nodemask_t *mask)
{
*set++ = '[';
set += nodelist_scnprintf(set, size-2, mask);
*set++ = ']';
*set++ = '\0';
}
static void periodic_timer_print(char *str, int size, uint64_t period)
{
if ( period == 0 )
{
strlcpy(str, "No periodic timer", size);
return;
}
snprintf(str, size,
"%u Hz periodic timer (period %u ms)",
1000000000/(int)period, (int)period/1000000);
}
static void dump_domains(unsigned char key)
{
struct domain *d;
struct vcpu *v;
s_time_t now = NOW();
#define tmpstr keyhandler_scratch
printk("'%c' pressed -> dumping domain info (now=0x%X:%08X)\n", key,
(u32)(now>>32), (u32)now);
rcu_read_lock(&domlist_read_lock);
for_each_domain ( d )
{
unsigned int i;
printk("General information for domain %u:\n", d->domain_id);
cpuset_print(tmpstr, sizeof(tmpstr), d->domain_dirty_cpumask);
printk(" refcnt=%d dying=%d pause_count=%d\n",
atomic_read(&d->refcnt), d->is_dying,
atomic_read(&d->pause_count));
printk(" nr_pages=%d xenheap_pages=%d shared_pages=%u paged_pages=%u "
"dirty_cpus=%s max_pages=%u\n", d->tot_pages, d->xenheap_pages,
atomic_read(&d->shr_pages), atomic_read(&d->paged_pages),
tmpstr, d->max_pages);
printk(" handle=%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x-%02x%02x%02x%02x%02x%02x vm_assist=%08lx\n",
d->handle[ 0], d->handle[ 1], d->handle[ 2], d->handle[ 3],
d->handle[ 4], d->handle[ 5], d->handle[ 6], d->handle[ 7],
d->handle[ 8], d->handle[ 9], d->handle[10], d->handle[11],
d->handle[12], d->handle[13], d->handle[14], d->handle[15],
d->vm_assist);
for ( i = 0 ; i < NR_DOMAIN_WATCHDOG_TIMERS; i++ )
if ( test_bit(i, &d->watchdog_inuse_map) )
printk(" watchdog %d expires in %d seconds\n",
i, (u32)((d->watchdog_timer[i].expires - NOW()) >> 30));
arch_dump_domain_info(d);
rangeset_domain_printk(d);
dump_pageframe_info(d);
nodeset_print(tmpstr, sizeof(tmpstr), &d->node_affinity);
printk("NODE affinity for domain %d: %s\n", d->domain_id, tmpstr);
printk("VCPU information and callbacks for domain %u:\n",
d->domain_id);
for_each_vcpu ( d, v )
{
printk(" VCPU%d: CPU%d [has=%c] poll=%d "
"upcall_pend = %02x, upcall_mask = %02x ",
v->vcpu_id, v->processor,
v->is_running ? 'T':'F', v->poll_evtchn,
vcpu_info(v, evtchn_upcall_pending),
vcpu_info(v, evtchn_upcall_mask));
cpuset_print(tmpstr, sizeof(tmpstr), v->vcpu_dirty_cpumask);
printk("dirty_cpus=%s ", tmpstr);
cpuset_print(tmpstr, sizeof(tmpstr), v->cpu_affinity);
printk("cpu_affinity=%s\n", tmpstr);
printk(" pause_count=%d pause_flags=%lx\n",
atomic_read(&v->pause_count), v->pause_flags);
arch_dump_vcpu_info(v);
periodic_timer_print(tmpstr, sizeof(tmpstr), v->periodic_period);
printk(" %s\n", tmpstr);
}
}
for_each_domain ( d )
{
for_each_vcpu ( d, v )
{
printk("Notifying guest %d:%d (virq %d, port %d, stat %d/%d/%d)\n",
d->domain_id, v->vcpu_id,
VIRQ_DEBUG, v->virq_to_evtchn[VIRQ_DEBUG],
test_bit(v->virq_to_evtchn[VIRQ_DEBUG],
&shared_info(d, evtchn_pending)),
test_bit(v->virq_to_evtchn[VIRQ_DEBUG],
&shared_info(d, evtchn_mask)),
test_bit(v->virq_to_evtchn[VIRQ_DEBUG] /
BITS_PER_EVTCHN_WORD(d),
&vcpu_info(v, evtchn_pending_sel)));
send_guest_vcpu_virq(v, VIRQ_DEBUG);
}
}
arch_dump_shared_mem_info();
rcu_read_unlock(&domlist_read_lock);
#undef tmpstr
}
static struct keyhandler dump_domains_keyhandler = {
.diagnostic = 1,
.u.fn = dump_domains,
.desc = "dump domain (and guest debug) info"
};
static cpumask_t read_clocks_cpumask;
static DEFINE_PER_CPU(s_time_t, read_clocks_time);
static DEFINE_PER_CPU(u64, read_cycles_time);
static void read_clocks_slave(void *unused)
{
unsigned int cpu = smp_processor_id();
local_irq_disable();
while ( !cpumask_test_cpu(cpu, &read_clocks_cpumask) )
cpu_relax();
per_cpu(read_clocks_time, cpu) = NOW();
per_cpu(read_cycles_time, cpu) = get_cycles();
cpumask_clear_cpu(cpu, &read_clocks_cpumask);
local_irq_enable();
}
static void read_clocks(unsigned char key)
{
unsigned int cpu = smp_processor_id(), min_stime_cpu, max_stime_cpu;
unsigned int min_cycles_cpu, max_cycles_cpu;
u64 min_stime, max_stime, dif_stime;
u64 min_cycles, max_cycles, dif_cycles;
static u64 sumdif_stime = 0, maxdif_stime = 0;
static u64 sumdif_cycles = 0, maxdif_cycles = 0;
static u32 count = 0;
static DEFINE_SPINLOCK(lock);
spin_lock(&lock);
smp_call_function(read_clocks_slave, NULL, 0);
local_irq_disable();
cpumask_andnot(&read_clocks_cpumask, &cpu_online_map, cpumask_of(cpu));
per_cpu(read_clocks_time, cpu) = NOW();
per_cpu(read_cycles_time, cpu) = get_cycles();
local_irq_enable();
while ( !cpumask_empty(&read_clocks_cpumask) )
cpu_relax();
min_stime_cpu = max_stime_cpu = min_cycles_cpu = max_cycles_cpu = cpu;
for_each_online_cpu ( cpu )
{
if ( per_cpu(read_clocks_time, cpu) <
per_cpu(read_clocks_time, min_stime_cpu) )
min_stime_cpu = cpu;
if ( per_cpu(read_clocks_time, cpu) >
per_cpu(read_clocks_time, max_stime_cpu) )
max_stime_cpu = cpu;
if ( per_cpu(read_cycles_time, cpu) <
per_cpu(read_cycles_time, min_cycles_cpu) )
min_cycles_cpu = cpu;
if ( per_cpu(read_cycles_time, cpu) >
per_cpu(read_cycles_time, max_cycles_cpu) )
max_cycles_cpu = cpu;
}
min_stime = per_cpu(read_clocks_time, min_stime_cpu);
max_stime = per_cpu(read_clocks_time, max_stime_cpu);
min_cycles = per_cpu(read_cycles_time, min_cycles_cpu);
max_cycles = per_cpu(read_cycles_time, max_cycles_cpu);
spin_unlock(&lock);
dif_stime = max_stime - min_stime;
if ( dif_stime > maxdif_stime )
maxdif_stime = dif_stime;
sumdif_stime += dif_stime;
dif_cycles = max_cycles - min_cycles;
if ( dif_cycles > maxdif_cycles )
maxdif_cycles = dif_cycles;
sumdif_cycles += dif_cycles;
count++;
printk("Synced stime skew: max=%"PRIu64"ns avg=%"PRIu64"ns "
"samples=%"PRIu32" current=%"PRIu64"ns\n",
maxdif_stime, sumdif_stime/count, count, dif_stime);
printk("Synced cycles skew: max=%"PRIu64" avg=%"PRIu64" "
"samples=%"PRIu32" current=%"PRIu64"\n",
maxdif_cycles, sumdif_cycles/count, count, dif_cycles);
}
static struct keyhandler read_clocks_keyhandler = {
.diagnostic = 1,
.u.fn = read_clocks,
.desc = "display multi-cpu clock info"
};
static struct keyhandler dump_runq_keyhandler = {
.diagnostic = 1,
.u.fn = dump_runq,
.desc = "dump run queues"
};
#ifdef PERF_COUNTERS
static struct keyhandler perfc_printall_keyhandler = {
.diagnostic = 1,
.u.fn = perfc_printall,
.desc = "print performance counters"
};
static struct keyhandler perfc_reset_keyhandler = {
.u.fn = perfc_reset,
.desc = "reset performance counters"
};
#endif
#ifdef LOCK_PROFILE
static struct keyhandler spinlock_printall_keyhandler = {
.diagnostic = 1,
.u.fn = spinlock_profile_printall,
.desc = "print lock profile info"
};
static struct keyhandler spinlock_reset_keyhandler = {
.u.fn = spinlock_profile_reset,
.desc = "reset lock profile info"
};
#endif
static void run_all_nonirq_keyhandlers(unsigned long unused)
{
/* Fire all the non-IRQ-context diagnostic keyhandlers */
struct keyhandler *h;
int k;
console_start_log_everything();
for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
{
process_pending_softirqs();
h = key_table[k];
if ( (h == NULL) || !h->diagnostic || h->irq_callback )
continue;
printk("[%c: %s]\n", k, h->desc);
(*h->u.fn)(k);
}
console_end_log_everything();
}
static DECLARE_TASKLET(run_all_keyhandlers_tasklet,
run_all_nonirq_keyhandlers, 0);
static void run_all_keyhandlers(unsigned char key, struct cpu_user_regs *regs)
{
struct keyhandler *h;
int k;
watchdog_disable();
printk("'%c' pressed -> firing all diagnostic keyhandlers\n", key);
/* Fire all the IRQ-context diangostic keyhandlers now */
for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
{
h = key_table[k];
if ( (h == NULL) || !h->diagnostic || !h->irq_callback )
continue;
printk("[%c: %s]\n", k, h->desc);
(*h->u.irq_fn)(k, regs);
}
watchdog_enable();
/* Trigger the others from a tasklet in non-IRQ context */
tasklet_schedule(&run_all_keyhandlers_tasklet);
}
static struct keyhandler run_all_keyhandlers_keyhandler = {
.irq_callback = 1,
.u.irq_fn = run_all_keyhandlers,
.desc = "print all diagnostics"
};
static void do_debug_key(unsigned char key, struct cpu_user_regs *regs)
{
printk("'%c' pressed -> trapping into debugger\n", key);
(void)debugger_trap_fatal(0xf001, regs);
nop(); /* Prevent the compiler doing tail call
optimisation, as that confuses xendbg a
bit. */
}
static struct keyhandler do_debug_key_keyhandler = {
.irq_callback = 1,
.u.irq_fn = do_debug_key,
.desc = "trap to xendbg"
};
static void do_toggle_alt_key(unsigned char key, struct cpu_user_regs *regs)
{
alt_key_handling = !alt_key_handling;
printk("'%c' pressed -> using %s key handling\n", key,
alt_key_handling ? "alternative" : "normal");
}
static struct keyhandler toggle_alt_keyhandler = {
.irq_callback = 1,
.u.irq_fn = do_toggle_alt_key,
.desc = "toggle alternative key handling"
};
void __init initialize_keytable(void)
{
if ( num_present_cpus() > 16 )
{
alt_key_handling = 1;
printk(XENLOG_INFO "Defaulting to alternative key handling; "
"send 'A' to switch to normal mode.\n");
}
register_keyhandler('A', &toggle_alt_keyhandler);
register_keyhandler('d', &dump_registers_keyhandler);
register_keyhandler('h', &show_handlers_keyhandler);
register_keyhandler('q', &dump_domains_keyhandler);
register_keyhandler('r', &dump_runq_keyhandler);
register_keyhandler('R', &reboot_machine_keyhandler);
register_keyhandler('t', &read_clocks_keyhandler);
register_keyhandler('0', &dump_dom0_registers_keyhandler);
register_keyhandler('%', &do_debug_key_keyhandler);
register_keyhandler('*', &run_all_keyhandlers_keyhandler);
#ifdef PERF_COUNTERS
register_keyhandler('p', &perfc_printall_keyhandler);
register_keyhandler('P', &perfc_reset_keyhandler);
#endif
#ifdef LOCK_PROFILE
register_keyhandler('l', &spinlock_printall_keyhandler);
register_keyhandler('L', &spinlock_reset_keyhandler);
#endif
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|