* @OSF_COPYRIGHT@
*/
-#include <mach_rt.h>
#include <mach_kdp.h>
#include <kdp/kdp_internal.h>
#include <mach_ldebug.h>
#endif
#include <i386/acpi.h>
-#include <chud/chud_xnu.h>
-#include <chud/chud_xnu_private.h>
-
#include <sys/kdebug.h>
#include <console/serial_protos.h>
+#if MONOTONIC
+#include <kern/monotonic.h>
+#endif /* MONOTONIC */
+
#if MP_DEBUG
#define PAUSE delay(1000000)
#define DBG(x...) kprintf(x)
static void mp_kdp_wait(boolean_t flush, boolean_t isNMI);
#endif /* MACH_KDP */
-static boolean_t mp_safe_spin_lock(usimple_lock_t lock);
#if MACH_KDP
static boolean_t cpu_signal_pending(int cpu, mp_event_t event);
#endif /* MACH_KDP */
uint32_t TSC_sync_margin = 0xFFF;
volatile boolean_t force_immediate_debugger_NMI = FALSE;
volatile boolean_t pmap_tlb_flush_timeout = FALSE;
-decl_simple_lock_data(,mp_kdp_lock);
+#if DEBUG || DEVELOPMENT
+boolean_t mp_interrupt_watchdog_enabled = TRUE;
+uint32_t mp_interrupt_watchdog_events = 0;
+#endif
decl_simple_lock_data(,debugger_callback_lock);
struct debugger_callback *debugger_callback = NULL;
static volatile int debugger_cpu = -1;
volatile long NMIPI_acks = 0;
volatile long NMI_count = 0;
+static NMI_reason_t NMI_panic_reason = NONE;
+static int vector_timed_out;
extern void NMI_cpus(void);
static void mp_cpus_call_action(void);
static void mp_call_PM(void);
-static boolean_t mp_cpus_call_wait_timeout = FALSE;
-
char mp_slave_stack[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); // Temp stack for slave init
/* PAL-related routines */
int ipi_vector, i386_intr_func_t ipi_handler);
void i386_start_cpu(int lapic_id, int cpu_num);
void i386_send_NMI(int cpu);
-
+void NMIPI_enable(boolean_t);
#if GPROF
/*
* Initialize dummy structs for profiling. These aren't used but
void
smp_init(void)
{
- simple_lock_init(&mp_kdp_lock, 0);
simple_lock_init(&mp_rv_lock, 0);
simple_lock_init(&debugger_callback_lock, 0);
lck_grp_attr_setdefault(&smp_lck_grp_attr);
mp_cpus_call_init();
mp_cpus_call_cpu_init(master_cpu);
+#if DEBUG || DEVELOPMENT
+ if (PE_parse_boot_argn("interrupt_watchdog",
+ &mp_interrupt_watchdog_enabled,
+ sizeof(mp_interrupt_watchdog_enabled))) {
+ kprintf("Interrupt watchdog %sabled\n",
+ mp_interrupt_watchdog_enabled ? "en" : "dis");
+ }
+#endif
+
if (PE_parse_boot_argn("TSC_sync_margin",
&TSC_sync_margin, sizeof(TSC_sync_margin))) {
kprintf("TSC sync Margin 0x%x\n", TSC_sync_margin);
* Initialize (or re-initialize) the descriptor tables for this cpu.
* Propagate processor mode to slave.
*/
- cpu_desc_init64(cpu_datap(slot_num));
+ cpu_desc_init(cpu_datap(slot_num));
/* Serialize use of the slave boot stack, etc. */
lck_mtx_lock(&mp_cpu_boot_lock);
DBGLOG(cpu_handle,my_cpu,MP_TLB_FLUSH);
i_bit_clear(MP_TLB_FLUSH, my_word);
pmap_update_interrupt();
- } else if (i_bit(MP_CHUD, my_word)) {
- DBGLOG(cpu_handle,my_cpu,MP_CHUD);
- i_bit_clear(MP_CHUD, my_word);
- chudxnu_cpu_signal_handler();
} else if (i_bit(MP_CALL, my_word)) {
DBGLOG(cpu_handle,my_cpu,MP_CALL);
i_bit_clear(MP_CALL, my_word);
NMIInterruptHandler(x86_saved_state_t *regs)
{
void *stackptr;
+ char pstr[192];
+ uint64_t now = mach_absolute_time();
if (panic_active() && !panicDebugging) {
if (pmsafe_debug)
if (cpu_number() == debugger_cpu)
goto NMExit;
- if (spinlock_timed_out) {
- char pstr[192];
- snprintf(&pstr[0], sizeof(pstr), "Panic(CPU %d): NMIPI for spinlock acquisition timeout, spinlock: %p, spinlock owner: %p, current_thread: %p, spinlock_owner_cpu: 0x%x\n", cpu_number(), spinlock_timed_out, (void *) spinlock_timed_out->interlock.lock_data, current_thread(), spinlock_owner_cpu);
- panic_i386_backtrace(stackptr, 64, &pstr[0], TRUE, regs);
- } else if (mp_cpus_call_wait_timeout) {
- char pstr[192];
- snprintf(&pstr[0], sizeof(pstr), "Panic(CPU %d): Unresponsive processor, this CPU timed-out during cross-call\n", cpu_number());
+ if (NMI_panic_reason == SPINLOCK_TIMEOUT) {
+ snprintf(&pstr[0], sizeof(pstr),
+ "Panic(CPU %d, time %llu): NMIPI for spinlock acquisition timeout, spinlock: %p, spinlock owner: %p, current_thread: %p, spinlock_owner_cpu: 0x%x\n",
+ cpu_number(), now, spinlock_timed_out, (void *) spinlock_timed_out->interlock.lock_data, current_thread(), spinlock_owner_cpu);
panic_i386_backtrace(stackptr, 64, &pstr[0], TRUE, regs);
- } else if (pmap_tlb_flush_timeout == TRUE) {
- char pstr[128];
- snprintf(&pstr[0], sizeof(pstr), "Panic(CPU %d): Unresponsive processor (this CPU did not acknowledge interrupts) TLB state:0x%x\n", cpu_number(), current_cpu_datap()->cpu_tlb_invalid);
+ } else if (NMI_panic_reason == TLB_FLUSH_TIMEOUT) {
+ snprintf(&pstr[0], sizeof(pstr),
+ "Panic(CPU %d, time %llu): NMIPI for unresponsive processor: TLB flush timeout, TLB state:0x%x\n",
+ cpu_number(), now, current_cpu_datap()->cpu_tlb_invalid);
panic_i386_backtrace(stackptr, 48, &pstr[0], TRUE, regs);
- }
-
+ } else if (NMI_panic_reason == CROSSCALL_TIMEOUT) {
+ snprintf(&pstr[0], sizeof(pstr),
+ "Panic(CPU %d, time %llu): NMIPI for unresponsive processor: cross-call timeout\n",
+ cpu_number(), now);
+ panic_i386_backtrace(stackptr, 64, &pstr[0], TRUE, regs);
+ } else if (NMI_panic_reason == INTERRUPT_WATCHDOG) {
+ snprintf(&pstr[0], sizeof(pstr),
+ "Panic(CPU %d, time %llu): NMIPI for unresponsive processor: interrupt watchdog for vector 0x%x\n",
+ cpu_number(), now, vector_timed_out);
+ panic_i386_backtrace(stackptr, 64, &pstr[0], TRUE, regs);
+ }
+
#if MACH_KDP
if (pmsafe_debug && !kdp_snapshot)
pmSafeMode(¤t_cpu_datap()->lcpu, PM_SAFE_FL_SAFE);
current_cpu_datap()->cpu_NMI_acknowledged = TRUE;
i_bit_clear(MP_KDP, ¤t_cpu_datap()->cpu_signals);
- if (pmap_tlb_flush_timeout ||
- spinlock_timed_out ||
- mp_cpus_call_wait_timeout ||
- panic_active()) {
+ if (panic_active() || NMI_panic_reason != NONE) {
mp_kdp_wait(FALSE, TRUE);
} else if (!mp_kdp_trap &&
!mp_kdp_is_NMI &&
intrs_enabled = ml_set_interrupts_enabled(FALSE);
for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (!cpu_datap(cpu)->cpu_running)
+ if (!cpu_is_running(cpu))
continue;
cpu_datap(cpu)->cpu_NMI_acknowledged = FALSE;
cpu_NMI_interrupt(cpu);
* are still serviced if interrupts are masked while we spin.
* Returns current interrupt state.
*/
-static boolean_t
+boolean_t
mp_safe_spin_lock(usimple_lock_t lock)
{
if (ml_get_interrupts_enabled()) {
lock->interlock.lock_data;
spinlock_timed_out = lock;
lock_cpu = spinlock_timeout_NMI(lowner);
- panic("mp_safe_spin_lock() timed out,"
- " lock: %p, owner thread: 0x%lx,"
- " current_thread: %p, owner on CPU 0x%x",
- lock, lowner,
- current_thread(), lock_cpu);
+ NMIPI_panic(cpu_to_cpumask(lock_cpu), SPINLOCK_TIMEOUT);
+ panic("mp_safe_spin_lock() timed out, lock: %p, owner thread: 0x%lx, current_thread: %p, owner on CPU 0x%x, time: %llu",
+ lock, lowner, current_thread(), lock_cpu, mach_absolute_time());
}
}
return FALSE;
return intrs_enabled;
}
+/*
+ * Deliver an NMIPI to a set of processors to cause them to panic .
+ */
void
-mp_cpus_NMIPI(cpumask_t cpu_mask) {
+NMIPI_panic(cpumask_t cpu_mask, NMI_reason_t why) {
unsigned int cpu, cpu_bit;
uint64_t deadline;
+ NMIPI_enable(TRUE);
+ NMI_panic_reason = why;
+
for (cpu = 0, cpu_bit = 1; cpu < real_ncpus; cpu++, cpu_bit <<= 1) {
- if (cpu_mask & cpu_bit)
- cpu_NMI_interrupt(cpu);
+ if ((cpu_mask & cpu_bit) == 0)
+ continue;
+ cpu_datap(cpu)->cpu_NMI_acknowledged = FALSE;
+ cpu_NMI_interrupt(cpu);
+ }
+
+ /* Wait (only so long) for NMi'ed cpus to respond */
+ deadline = mach_absolute_time() + LockTimeOut;
+ for (cpu = 0, cpu_bit = 1; cpu < real_ncpus; cpu++, cpu_bit <<= 1) {
+ if ((cpu_mask & cpu_bit) == 0)
+ continue;
+ while (!cpu_datap(cpu)->cpu_NMI_acknowledged &&
+ mach_absolute_time() < deadline) {
+ cpu_pause();
+ }
}
- deadline = mach_absolute_time() + (LockTimeOut);
- while (mach_absolute_time() < deadline)
- cpu_pause();
}
#if MACH_ASSERT
if (mp_spin_timeout(tsc_spin_start)) {
cpumask_t cpus_unresponsive;
- mp_cpus_call_wait_timeout = TRUE;
cpus_unresponsive = cpus_called & ~(*cpus_responded);
- mp_cpus_NMIPI(cpus_unresponsive);
+ NMIPI_panic(cpus_unresponsive, CROSSCALL_TIMEOUT);
panic("mp_cpus_call_wait() timeout, cpus: 0x%llx",
cpus_unresponsive);
}
}
for (cpu = 0; cpu < (cpu_t) real_ncpus; cpu++) {
if (((cpu_to_cpumask(cpu) & cpus) == 0) ||
- !cpu_datap(cpu)->cpu_running)
+ !cpu_is_running(cpu))
continue;
tsc_spin_start = rdtsc64();
if (cpu == (cpu_t) cpu_number()) {
for (cpu = 0; cpu < (cpu_t) real_ncpus; cpu++) {
if ((cpu == (cpu_t) cpu_number())
|| ((cpu_to_cpumask(cpu) & cpus) == 0)
- || (!cpu_datap(cpu)->cpu_running))
+ || !cpu_is_running(cpu))
{
continue;
}
return;
}
- simple_lock(&x86_topo_lock);
+ mp_safe_spin_lock(&x86_topo_lock);
cdp->cpu_running = TRUE;
started_cpu();
simple_unlock(&x86_topo_lock);
TRACE_MP_CPU_DEACTIVATE | DBG_FUNC_START,
0, 0, 0, 0, 0);
- simple_lock(&x86_topo_lock);
+ mp_safe_spin_lock(&x86_topo_lock);
cdp->cpu_running = FALSE;
simple_unlock(&x86_topo_lock);
timer_queue_shutdown(&cdp->rtclock_timer.queue);
mp_cpus_call(cpu_to_cpumask(master_cpu), ASYNC, timer_queue_expire_local, NULL);
+#if MONOTONIC
+ mt_cpu_down(cdp);
+#endif /* MONOTONIC */
+
/*
* Open an interrupt window
* and ensure any pending IPI or timer is serviced
void
-mp_kdp_enter(void)
+mp_kdp_enter(boolean_t proceed_on_failure)
{
unsigned int cpu;
unsigned int ncpus = 0;
DBG("mp_kdp_enter()\n");
-#if DEBUG
- if (!smp_initialized)
- simple_lock_init(&mp_kdp_lock, 0);
-#endif
-
/*
* Here to enter the debugger.
* In case of races, only one cpu is allowed to enter kdp after
return;
}
- cpu_datap(my_cpu)->debugger_entry_time = mach_absolute_time();
- simple_lock(&mp_kdp_lock);
-
- if (pmsafe_debug && !kdp_snapshot)
- pmSafeMode(¤t_cpu_datap()->lcpu, PM_SAFE_FL_SAFE);
+ uint64_t start_time = cpu_datap(my_cpu)->debugger_entry_time = mach_absolute_time();
+ int locked = 0;
+ while (!locked || mp_kdp_trap) {
+ if (locked) {
+ simple_unlock(&x86_topo_lock);
+ }
+ if (proceed_on_failure) {
+ if (mach_absolute_time() - start_time > 500000000ll) {
+ kprintf("mp_kdp_enter() can't get x86_topo_lock! Debugging anyway! #YOLO\n");
+ break;
+ }
+ locked = simple_lock_try(&x86_topo_lock);
+ if (!locked) {
+ cpu_pause();
+ }
+ } else {
+ mp_safe_spin_lock(&x86_topo_lock);
+ locked = TRUE;
+ }
- while (mp_kdp_trap) {
- simple_unlock(&mp_kdp_lock);
- DBG("mp_kdp_enter() race lost\n");
+ if (locked && mp_kdp_trap) {
+ simple_unlock(&x86_topo_lock);
+ DBG("mp_kdp_enter() race lost\n");
#if MACH_KDP
- mp_kdp_wait(TRUE, FALSE);
+ mp_kdp_wait(TRUE, FALSE);
#endif
- simple_lock(&mp_kdp_lock);
+ locked = FALSE;
+ }
}
+
+ if (pmsafe_debug && !kdp_snapshot)
+ pmSafeMode(¤t_cpu_datap()->lcpu, PM_SAFE_FL_SAFE);
+
debugger_cpu = my_cpu;
ncpus = 1;
- mp_kdp_ncpus = 1; /* self */
+ atomic_incl((volatile long *)&mp_kdp_ncpus, 1);
mp_kdp_trap = TRUE;
debugger_entry_time = cpu_datap(my_cpu)->debugger_entry_time;
- simple_unlock(&mp_kdp_lock);
/*
* Deliver a nudge to other cpus, counting how many
DBG("mp_kdp_enter() signaling other processors\n");
if (force_immediate_debugger_NMI == FALSE) {
for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (cpu == my_cpu || !cpu_datap(cpu)->cpu_running)
+ if (cpu == my_cpu || !cpu_is_running(cpu))
continue;
ncpus++;
i386_signal_cpu(cpu, MP_KDP, ASYNC);
cpu_pause();
}
/* If we've timed out, and some processor(s) are still unresponsive,
- * interrupt them with an NMI via the local APIC.
+ * interrupt them with an NMI via the local APIC, iff a panic is
+ * in progress.
*/
+ if (panic_active()) {
+ NMIPI_enable(TRUE);
+ }
if (mp_kdp_ncpus != ncpus) {
+ cpumask_t cpus_NMI_pending = 0;
DBG("mp_kdp_enter() timed-out on cpu %d, NMI-ing\n", my_cpu);
for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (cpu == my_cpu || !cpu_datap(cpu)->cpu_running)
+ if (cpu == my_cpu || !cpu_is_running(cpu))
continue;
- if (cpu_signal_pending(cpu, MP_KDP))
+ if (cpu_signal_pending(cpu, MP_KDP)) {
+ cpus_NMI_pending |= cpu_to_cpumask(cpu);
cpu_NMI_interrupt(cpu);
+ }
}
/* Wait again for the same timeout */
tsc_timeout = rdtsc64() + (LockTimeOutTSC);
cpu_pause();
}
if (mp_kdp_ncpus != ncpus) {
- panic("mp_kdp_enter() timed-out waiting after NMI");
+ kdb_printf("mp_kdp_enter(): %llu, %lu, %u TIMED-OUT WAITING FOR NMI-ACK, PROCEEDING\n", cpus_NMI_pending, mp_kdp_ncpus, ncpus);
}
}
}
else
for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (cpu == my_cpu || !cpu_datap(cpu)->cpu_running)
+ if (cpu == my_cpu || !cpu_is_running(cpu))
continue;
cpu_NMI_interrupt(cpu);
}
+ if (locked) {
+ simple_unlock(&x86_topo_lock);
+ }
+
DBG("mp_kdp_enter() %d processors done %s\n",
(int)mp_kdp_ncpus, (mp_kdp_ncpus == ncpus) ? "OK" : "timed out");
mp_kdp_wait(boolean_t flush, boolean_t isNMI)
{
DBG("mp_kdp_wait()\n");
- /* If an I/O port has been specified as a debugging aid, issue a read */
- panic_io_port_read();
+
current_cpu_datap()->debugger_ipi_time = mach_absolute_time();
#if CONFIG_MCA
/* If we've trapped due to a machine-check, save MCA registers */
DBG("mp_kdp_exit() done\n");
(void) ml_set_interrupts_enabled(mp_kdp_state);
- postcode(0);
-}
-
-#define TRAP_DEBUGGER __asm__ volatile("int3")
-
-kern_return_t
-DebuggerWithCallback(kern_return_t (*callback) (void*),
- void *callback_context,
- boolean_t proceed_on_sync_failure)
-{
- simple_lock(&debugger_callback_lock);
-
- struct debugger_callback callback_buf = {
- .callback = callback,
- .callback_context = callback_context,
- .proceed_on_sync_failure = proceed_on_sync_failure,
- .error = KERN_FAILURE
- };
-
- assert(debugger_callback == NULL);
- debugger_callback = &callback_buf;
-
- TRAP_DEBUGGER;
-
- debugger_callback = NULL;
-
- simple_unlock(&debugger_callback_lock);
-
- return callback_buf.error;
+ postcode(MP_KDP_EXIT);
}
#endif /* MACH_KDP */
boolean_t istate;
uint64_t spin_abs;
uint64_t deadline;
+ cpu_data_t *cdp;
kprintf("kernel_spin(%llu) spinning uninterruptibly\n", spin_ns);
istate = ml_set_interrupts_enabled(FALSE);
+ cdp = current_cpu_datap();
nanoseconds_to_absolutetime(spin_ns, &spin_abs);
+
+ /* Fake interrupt handler entry for testing mp_interrupt_watchdog() */
+ cdp->cpu_int_event_time = mach_absolute_time();
+ cdp->cpu_int_state = (void *) USER_STATE(current_thread());
+
deadline = mach_absolute_time() + spin_ns;
while (mach_absolute_time() < deadline)
cpu_pause();
+
+ cdp->cpu_int_event_time = 0;
+ cdp->cpu_int_state = NULL;
+
ml_set_interrupts_enabled(istate);
kprintf("kernel_spin() continuing\n");
}
+
+/*
+ * Called from the scheduler's maintenance thread,
+ * scan running processors for long-running ISRs and:
+ * - panic if longer than LockTimeOut, or
+ * - log if more than a quantum.
+ */
+void
+mp_interrupt_watchdog(void)
+{
+ cpu_t cpu;
+ boolean_t intrs_enabled = FALSE;
+ uint16_t cpu_int_num;
+ uint64_t cpu_int_event_time;
+ uint64_t cpu_rip;
+ uint64_t cpu_int_duration;
+ uint64_t now;
+ x86_saved_state_t *cpu_int_state;
+
+ if (__improbable(!mp_interrupt_watchdog_enabled))
+ return;
+
+ intrs_enabled = ml_set_interrupts_enabled(FALSE);
+ now = mach_absolute_time();
+ /*
+ * While timeouts are not suspended,
+ * check all other processors for long outstanding interrupt handling.
+ */
+ for (cpu = 0;
+ cpu < (cpu_t) real_ncpus && !machine_timeout_suspended();
+ cpu++) {
+ if ((cpu == (cpu_t) cpu_number()) ||
+ (!cpu_is_running(cpu)))
+ continue;
+ cpu_int_event_time = cpu_datap(cpu)->cpu_int_event_time;
+ if (cpu_int_event_time == 0)
+ continue;
+ if (__improbable(now < cpu_int_event_time))
+ continue; /* skip due to inter-processor skew */
+ cpu_int_state = cpu_datap(cpu)->cpu_int_state;
+ if (__improbable(cpu_int_state == NULL))
+ /* The interrupt may have been dismissed */
+ continue;
+
+ /* Here with a cpu handling an interrupt */
+
+ cpu_int_duration = now - cpu_int_event_time;
+ if (__improbable(cpu_int_duration > LockTimeOut)) {
+ cpu_int_num = saved_state64(cpu_int_state)->isf.trapno;
+ cpu_rip = saved_state64(cpu_int_state)->isf.rip;
+ vector_timed_out = cpu_int_num;
+ NMIPI_panic(cpu_to_cpumask(cpu), INTERRUPT_WATCHDOG);
+ panic("Interrupt watchdog, "
+ "cpu: %d interrupt: 0x%x time: %llu..%llu state: %p RIP: 0x%llx",
+ cpu, cpu_int_num, cpu_int_event_time, now, cpu_int_state, cpu_rip);
+ /* NOT REACHED */
+ } else if (__improbable(cpu_int_duration > (uint64_t) std_quantum)) {
+ mp_interrupt_watchdog_events++;
+ cpu_int_num = saved_state64(cpu_int_state)->isf.trapno;
+ cpu_rip = saved_state64(cpu_int_state)->isf.rip;
+ ml_set_interrupts_enabled(intrs_enabled);
+ printf("Interrupt watchdog, "
+ "cpu: %d interrupt: 0x%x time: %llu..%llu RIP: 0x%llx\n",
+ cpu, cpu_int_num, cpu_int_event_time, now, cpu_rip);
+ return;
+ }
+ }
+
+ ml_set_interrupts_enabled(intrs_enabled);
+}
#endif
projects / apple / xnu.git / blobdiff