* @OSF_COPYRIGHT@
*/
-#include <mach_rt.h>
#include <mach_kdp.h>
+#include <kdp/kdp_internal.h>
#include <mach_ldebug.h>
#include <gprof.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)
#if MACH_KDP
static void mp_kdp_wait(boolean_t flush, boolean_t isNMI);
#endif /* MACH_KDP */
-static void mp_rendezvous_action(void);
-static void mp_broadcast_action(void);
#if MACH_KDP
static boolean_t cpu_signal_pending(int cpu, mp_event_t event);
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;
decl_lck_mtx_data(static, mp_cpu_boot_lock);
lck_mtx_ext_t mp_cpu_boot_lock_ext;
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);
lck_grp_init(&smp_lck_grp, "i386_smp", &smp_lck_grp_attr);
lck_mtx_init_ext(&mp_cpu_boot_lock, &mp_cpu_boot_lock_ext, &smp_lck_grp, LCK_ATTR_NULL);
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_RENDEZVOUS, my_word)) {
- DBGLOG(cpu_handle,my_cpu,MP_RENDEZVOUS);
- i_bit_clear(MP_RENDEZVOUS, my_word);
- mp_rendezvous_action();
- } else if (i_bit(MP_BROADCAST, my_word)) {
- DBGLOG(cpu_handle,my_cpu,MP_BROADCAST);
- i_bit_clear(MP_BROADCAST, my_word);
- mp_broadcast_action();
- } 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);
+ 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 (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());
- 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 (virtualized && (debug_boot_arg & DB_NMI)) {
+ } else if (!mp_kdp_trap &&
+ !mp_kdp_is_NMI &&
+ virtualized && (debug_boot_arg & DB_NMI)) {
/*
* Under a VMM with the debug boot-arg set, drop into kdp.
* Since an NMI is involved, there's a risk of contending with
* a panic. And side-effects of NMIs may result in entry into,
* and continuing from, the debugger being unreliable.
*/
- kprintf_break_lock();
- kprintf("Debugger entry requested by NMI\n");
- kdp_i386_trap(T_DEBUG, saved_state64(regs), 0, 0);
- printf("Debugger entry requested by NMI\n");
+ if (__sync_bool_compare_and_swap(&mp_kdp_is_NMI, FALSE, TRUE)) {
+ kprintf_break_lock();
+ kprintf("Debugger entry requested by NMI\n");
+ kdp_i386_trap(T_DEBUG, saved_state64(regs), 0, 0);
+ printf("Debugger entry requested by NMI\n");
+ mp_kdp_is_NMI = FALSE;
+ } else {
+ mp_kdp_wait(FALSE, FALSE);
+ }
} else {
mp_kdp_wait(FALSE, FALSE);
}
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);
KERNEL_DEBUG(TRACE_MP_TLB_FLUSH | DBG_FUNC_END, cpu, 0, 0, 0, 0);
}
-/*
- * Send event to all running cpus.
- * Called with the topology locked.
- */
-void
-i386_signal_cpus(mp_event_t event, mp_sync_t mode)
-{
- unsigned int cpu;
- unsigned int my_cpu = cpu_number();
-
- assert(hw_lock_held((hw_lock_t)&x86_topo_lock));
-
- for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (cpu == my_cpu || !cpu_datap(cpu)->cpu_running)
- continue;
- i386_signal_cpu(cpu, event, mode);
- }
-}
-
-/*
- * Return the number of running cpus.
- * Called with the topology locked.
- */
-int
-i386_active_cpus(void)
-{
- unsigned int cpu;
- unsigned int ncpus = 0;
-
- assert(hw_lock_held((hw_lock_t)&x86_topo_lock));
-
- for (cpu = 0; cpu < real_ncpus; cpu++) {
- if (cpu_datap(cpu)->cpu_running)
- ncpus++;
- }
- return(ncpus);
-}
-
/*
* Helper function called when busy-waiting: panic if too long
* a TSC-based time has elapsed since the start of the spin.
* unless we have serial console printing (kprintf) enabled
* in which case we allow an even greater margin.
*/
- tsc_timeout = disable_serial_output ? (uint64_t) LockTimeOutTSC << 2
- : (uint64_t) LockTimeOutTSC << 4;
+ tsc_timeout = disable_serial_output ? LockTimeOutTSC << 2
+ : LockTimeOutTSC << 4;
return (rdtsc64() > tsc_start + tsc_timeout);
}
/*
* Helper function to take a spinlock while ensuring that incoming IPIs
* 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;
*/
static void
-mp_rendezvous_action(void)
+mp_rendezvous_action(__unused void *null)
{
boolean_t intrs_enabled;
uint64_t tsc_spin_start;
/* spin on entry rendezvous */
atomic_incl(&mp_rv_entry, 1);
tsc_spin_start = rdtsc64();
+
while (mp_rv_entry < mp_rv_ncpus) {
/* poll for pesky tlb flushes if interrupts disabled */
if (!intrs_enabled)
handle_pending_TLB_flushes();
- if (mp_spin_timeout(tsc_spin_start))
- panic("mp_rendezvous_action() entry");
+ if (mp_spin_timeout(tsc_spin_start)) {
+ panic("mp_rv_action() entry: %ld of %d responses, start: 0x%llx, cur: 0x%llx", mp_rv_entry, mp_rv_ncpus, tsc_spin_start, rdtsc64());
+ }
}
/* action function */
if (!intrs_enabled)
handle_pending_TLB_flushes();
if (mp_spin_timeout(tsc_spin_start))
- panic("mp_rendezvous_action() exit");
+ panic("mp_rv_action() exit: %ld of %d responses, start: 0x%llx, cur: 0x%llx", mp_rv_exit, mp_rv_ncpus, tsc_spin_start, rdtsc64());
}
/* teardown function */
* signal other processors, which will call mp_rendezvous_action()
* with interrupts disabled
*/
- (void) mp_safe_spin_lock(&x86_topo_lock);
- mp_rv_ncpus = i386_active_cpus();
- i386_signal_cpus(MP_RENDEZVOUS, ASYNC);
- simple_unlock(&x86_topo_lock);
+ mp_rv_ncpus = mp_cpus_call(CPUMASK_OTHERS, NOSYNC, &mp_rendezvous_action, NULL) + 1;
/* call executor function on this cpu */
- mp_rendezvous_action();
+ mp_rendezvous_action(NULL);
/*
* Spin for everyone to complete.
tsc_spin_start = rdtsc64();
while (mp_rv_complete < mp_rv_ncpus) {
if (mp_spin_timeout(tsc_spin_start))
- panic("mp_rendezvous() timeout");
+ panic("mp_rendezvous() timeout: %ld of %d responses, start: 0x%llx, cur: 0x%llx", mp_rv_complete, mp_rv_ncpus, tsc_spin_start, rdtsc64());
}
/* Tidy up */
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
(void (*)(void *,void *))action_func,
arg,
NULL,
- NULL,
NULL);
}
mp_call_queue_t *cqp;
uint64_t tsc_spin_start;
+ assert(ml_get_interrupts_enabled() == 0 || get_preemption_level() != 0);
cqp = &mp_cpus_call_head[cpu_number()];
tsc_spin_start = rdtsc64();
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);
}
void (*action_func)(void *, void *),
void *arg0,
void *arg1,
- cpumask_t *cpus_calledp,
- cpumask_t *cpus_notcalledp)
+ cpumask_t *cpus_calledp)
{
- cpu_t cpu;
+ cpu_t cpu = 0;
boolean_t intrs_enabled = FALSE;
boolean_t call_self = FALSE;
cpumask_t cpus_called = 0;
- cpumask_t cpus_notcalled = 0;
cpumask_t cpus_responded = 0;
long cpus_call_count = 0;
uint64_t tsc_spin_start;
}
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()) {
} else {
/*
* Here to queue a call to cpu and IPI.
- * Spinning for request buffer unless NOSYNC.
*/
mp_call_t *callp = NULL;
mp_call_queue_t *cqp = &mp_cpus_call_head[cpu];
if (callp == NULL)
callp = mp_call_alloc();
intrs_inner = mp_call_head_lock(cqp);
- if (mode == NOSYNC) {
- if (callp == NULL) {
- cpus_notcalled |= cpu_to_cpumask(cpu);
- mp_call_head_unlock(cqp, intrs_inner);
- KERNEL_DEBUG_CONSTANT(
- TRACE_MP_CPUS_CALL_NOBUF,
- cpu, 0, 0, 0, 0);
- continue;
- }
- callp->maskp = NULL;
- } else {
- if (callp == NULL) {
- mp_call_head_unlock(cqp, intrs_inner);
- KERNEL_DEBUG_CONSTANT(
- TRACE_MP_CPUS_CALL_NOBUF,
- cpu, 0, 0, 0, 0);
- if (!intrs_inner) {
- /* Sniffing w/o locking */
- if (!queue_empty(&cqp->queue))
- mp_cpus_call_action();
- handle_pending_TLB_flushes();
- }
- if (mp_spin_timeout(tsc_spin_start))
- panic("mp_cpus_call1() timeout");
- goto queue_call;
+ if (callp == NULL) {
+ mp_call_head_unlock(cqp, intrs_inner);
+ KERNEL_DEBUG_CONSTANT(
+ TRACE_MP_CPUS_CALL_NOBUF,
+ cpu, 0, 0, 0, 0);
+ if (!intrs_inner) {
+ /* Sniffing w/o locking */
+ if (!queue_empty(&cqp->queue))
+ mp_cpus_call_action();
+ handle_pending_TLB_flushes();
}
- callp->maskp = &cpus_responded;
+ if (mp_spin_timeout(tsc_spin_start))
+ panic("mp_cpus_call1() timeout start: 0x%llx, cur: 0x%llx",
+ tsc_spin_start, rdtsc64());
+ goto queue_call;
}
+ callp->maskp = (mode == NOSYNC) ? NULL : &cpus_responded;
callp->func = action_func;
callp->arg0 = arg0;
callp->arg1 = arg1;
}
}
- /* Safe to allow pre-emption now */
- mp_enable_preemption();
-
/* For ASYNC, now wait for all signaled cpus to complete their calls */
if (mode == ASYNC)
mp_cpus_call_wait(intrs_enabled, cpus_called, &cpus_responded);
+ /* Safe to allow pre-emption now */
+ mp_enable_preemption();
+
out:
if (call_self){
cpus_called |= cpu_to_cpumask(cpu);
if (cpus_calledp)
*cpus_calledp = cpus_called;
- if (cpus_notcalledp)
- *cpus_notcalledp = cpus_notcalled;
KERNEL_DEBUG_CONSTANT(
TRACE_MP_CPUS_CALL | DBG_FUNC_END,
- cpus_call_count, cpus_called, cpus_notcalled, 0, 0);
+ cpus_call_count, cpus_called, 0, 0, 0);
return (cpu_t) cpus_call_count;
}
static void
-mp_broadcast_action(void)
+mp_broadcast_action(__unused void *null)
{
/* call action function */
if (mp_bc_action_func != NULL)
/*
* signal other processors, which will call mp_broadcast_action()
*/
- simple_lock(&x86_topo_lock);
- mp_bc_ncpus = i386_active_cpus(); /* total including this cpu */
- mp_bc_count = mp_bc_ncpus;
- i386_signal_cpus(MP_BROADCAST, ASYNC);
+ mp_bc_count = real_ncpus; /* assume max possible active */
+ mp_bc_ncpus = mp_cpus_call(CPUMASK_OTHERS, NOSYNC, *mp_broadcast_action, NULL) + 1;
+ atomic_decl(&mp_bc_count, real_ncpus - mp_bc_ncpus); /* subtract inactive */
/* call executor function on this cpu */
- mp_broadcast_action();
- simple_unlock(&x86_topo_lock);
+ mp_broadcast_action(NULL);
- /* block for all cpus to have run action_func */
+ /* block for other cpus to have run action_func */
if (mp_bc_ncpus > 1)
thread_block(THREAD_CONTINUE_NULL);
else
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
#if MACH_KDP
volatile boolean_t mp_kdp_trap = FALSE;
+volatile boolean_t mp_kdp_is_NMI = FALSE;
volatile unsigned long mp_kdp_ncpus;
boolean_t mp_kdp_state;
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);
* "unsafe-to-interrupt" points such as the trampolines,
* but neither do we want to lose state by waiting too long.
*/
- tsc_timeout = rdtsc64() + (ncpus * 1000 * 1000 * 10ULL);
-
- if (virtualized)
- tsc_timeout = ~0ULL;
+ tsc_timeout = rdtsc64() + (LockTimeOutTSC);
while (mp_kdp_ncpus != ncpus && rdtsc64() < tsc_timeout) {
/*
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);
+ while (mp_kdp_ncpus != ncpus && rdtsc64() < tsc_timeout) {
+ handle_pending_TLB_flushes();
+ cpu_pause();
+ }
+ if (mp_kdp_ncpus != ncpus) {
+ 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);
+ postcode(MP_KDP_EXIT);
}
+
#endif /* MACH_KDP */
boolean_t
-mp_recent_debugger_activity() {
+mp_recent_debugger_activity(void) {
uint64_t abstime = mach_absolute_time();
return (((abstime - debugger_entry_time) < LastDebuggerEntryAllowance) ||
((abstime - debugger_exit_time) < LastDebuggerEntryAllowance));
return cwd.cwd_result;
}
}
+
+#if DEBUG || DEVELOPMENT
+void
+kernel_spin(uint64_t spin_ns)
+{
+ 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