X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/b0d623f7f2ae71ed96e60569f61f9a9a27016e80..5ba3f43ea354af8ad55bea84372a2bc834d8757c:/osfmk/kern/thread.c diff --git a/osfmk/kern/thread.c b/osfmk/kern/thread.c index b33a7d2be..0057c988f 100644 --- a/osfmk/kern/thread.c +++ b/osfmk/kern/thread.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2009 Apple Inc. All rights reserved. + * Copyright (c) 2000-2015 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -91,11 +91,14 @@ #include #include +#include +#include #include #include #include #include +#include #include #include #include @@ -109,19 +112,39 @@ #include #include #include +#include +#include #include #include #include +#include +#include +#include +#include + +#include +#if KPC +#include +#endif + +#if MONOTONIC +#include +#include +#endif /* MONOTONIC */ #include #include +#include #include #include #include - +#include #include +#include + +#include /* * Exported interfaces @@ -130,18 +153,34 @@ #include #include #include +#include +#include static struct zone *thread_zone; static lck_grp_attr_t thread_lck_grp_attr; lck_attr_t thread_lck_attr; lck_grp_t thread_lck_grp; +struct zone *thread_qos_override_zone; + decl_simple_lock_data(static,thread_stack_lock) static queue_head_t thread_stack_queue; decl_simple_lock_data(static,thread_terminate_lock) static queue_head_t thread_terminate_queue; +static queue_head_t crashed_threads_queue; + +decl_simple_lock_data(static,thread_exception_lock) +static queue_head_t thread_exception_queue; + +struct thread_exception_elt { + queue_chain_t elt; + exception_type_t exception_type; + task_t exception_task; + thread_t exception_thread; +}; + static struct thread thread_template, init_thread; static void sched_call_null( @@ -150,14 +189,44 @@ static void sched_call_null( #ifdef MACH_BSD extern void proc_exit(void *); +extern mach_exception_data_type_t proc_encode_exit_exception_code(void *); extern uint64_t get_dispatchqueue_offset_from_proc(void *); +extern uint64_t get_return_to_kernel_offset_from_proc(void *p); +extern int proc_selfpid(void); +extern char * proc_name_address(void *p); #endif /* MACH_BSD */ +extern int disable_exc_resource; +extern int audio_active; extern int debug_task; int thread_max = CONFIG_THREAD_MAX; /* Max number of threads */ int task_threadmax = CONFIG_THREAD_MAX; -static uint64_t thread_unique_id = 0; +static uint64_t thread_unique_id = 100; + +struct _thread_ledger_indices thread_ledgers = { -1 }; +static ledger_template_t thread_ledger_template = NULL; +static void init_thread_ledgers(void); + +#if CONFIG_JETSAM +void jetsam_on_ledger_cpulimit_exceeded(void); +#endif + +/* + * Level (in terms of percentage of the limit) at which the CPU usage monitor triggers telemetry. + * + * (ie when any thread's CPU consumption exceeds 70% of the limit, start taking user + * stacktraces, aka micro-stackshots) + */ +#define CPUMON_USTACKSHOTS_TRIGGER_DEFAULT_PCT 70 + +int cpumon_ustackshots_trigger_pct; /* Percentage. Level at which we start gathering telemetry. */ +void __attribute__((noinline)) SENDING_NOTIFICATION__THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU(void); + +/* + * The smallest interval over which we support limiting CPU consumption is 1ms + */ +#define MINIMUM_CPULIMIT_INTERVAL_MS 1 void thread_bootstrap(void) @@ -166,6 +235,10 @@ thread_bootstrap(void) * Fill in a template thread for fast initialization. */ +#if MACH_ASSERT + thread_template.thread_magic = THREAD_MAGIC; +#endif /* MACH_ASSERT */ + thread_template.runq = PROCESSOR_NULL; thread_template.ref_count = 2; @@ -173,7 +246,7 @@ thread_bootstrap(void) thread_template.reason = AST_NONE; thread_template.at_safe_point = FALSE; thread_template.wait_event = NO_EVENT64; - thread_template.wait_queue = WAIT_QUEUE_NULL; + thread_template.waitq = NULL; thread_template.wait_result = THREAD_WAITING; thread_template.options = THREAD_ABORTSAFE; thread_template.state = TH_WAIT | TH_UNINT; @@ -182,32 +255,55 @@ thread_bootstrap(void) thread_template.parameter = NULL; thread_template.importance = 0; - thread_template.sched_mode = 0; - thread_template.safe_mode = 0; + thread_template.sched_mode = TH_MODE_NONE; + thread_template.sched_flags = 0; + thread_template.saved_mode = TH_MODE_NONE; thread_template.safe_release = 0; + thread_template.th_sched_bucket = TH_BUCKET_RUN; - thread_template.priority = 0; + thread_template.sfi_class = SFI_CLASS_UNSPECIFIED; + thread_template.sfi_wait_class = SFI_CLASS_UNSPECIFIED; + + thread_template.active = 0; + thread_template.started = 0; + thread_template.static_param = 0; + thread_template.policy_reset = 0; + + thread_template.base_pri = BASEPRI_DEFAULT; thread_template.sched_pri = 0; thread_template.max_priority = 0; thread_template.task_priority = 0; thread_template.promotions = 0; thread_template.pending_promoter_index = 0; - thread_template.pending_promoter[0] = - thread_template.pending_promoter[1] = NULL; + thread_template.pending_promoter[0] = NULL; + thread_template.pending_promoter[1] = NULL; + thread_template.rwlock_count = 0; + thread_template.realtime.deadline = UINT64_MAX; - thread_template.current_quantum = 0; + thread_template.quantum_remaining = 0; + thread_template.last_run_time = 0; + thread_template.last_made_runnable_time = THREAD_NOT_RUNNABLE; + thread_template.last_basepri_change_time = THREAD_NOT_RUNNABLE; + thread_template.same_pri_latency = 0; thread_template.computation_metered = 0; thread_template.computation_epoch = 0; +#if defined(CONFIG_SCHED_TIMESHARE_CORE) thread_template.sched_stamp = 0; - thread_template.sched_usage = 0; thread_template.pri_shift = INT8_MAX; + thread_template.sched_usage = 0; thread_template.cpu_usage = thread_template.cpu_delta = 0; +#endif thread_template.c_switch = thread_template.p_switch = thread_template.ps_switch = 0; +#if MONOTONIC + memset(&thread_template.t_monotonic, 0, + sizeof(thread_template.t_monotonic)); +#endif /* MONOTONIC */ + thread_template.bound_processor = PROCESSOR_NULL; thread_template.last_processor = PROCESSOR_NULL; @@ -215,22 +311,23 @@ thread_bootstrap(void) timer_init(&thread_template.user_timer); timer_init(&thread_template.system_timer); + timer_init(&thread_template.ptime); thread_template.user_timer_save = 0; thread_template.system_timer_save = 0; thread_template.vtimer_user_save = 0; thread_template.vtimer_prof_save = 0; thread_template.vtimer_rlim_save = 0; + thread_template.vtimer_qos_save = 0; + +#if CONFIG_SCHED_SFI + thread_template.wait_sfi_begin_time = 0; +#endif thread_template.wait_timer_is_set = FALSE; thread_template.wait_timer_active = 0; thread_template.depress_timer_active = 0; - thread_template.special_handler.handler = special_handler; - thread_template.special_handler.next = NULL; - - thread_template.funnel_lock = THR_FUNNEL_NULL; - thread_template.funnel_state = 0; thread_template.recover = (vm_offset_t)NULL; thread_template.map = VM_MAP_NULL; @@ -241,16 +338,68 @@ thread_bootstrap(void) thread_template.t_dtrace_tracing = 0; #endif /* CONFIG_DTRACE */ - thread_template.t_chud = 0; +#if KPERF + thread_template.kperf_flags = 0; + thread_template.kperf_pet_gen = 0; + thread_template.kperf_c_switch = 0; + thread_template.kperf_pet_cnt = 0; +#endif + +#if KPC + thread_template.kpc_buf = NULL; +#endif + +#if HYPERVISOR + thread_template.hv_thread_target = NULL; +#endif /* HYPERVISOR */ + +#if (DEVELOPMENT || DEBUG) + thread_template.t_page_creation_throttled_hard = 0; + thread_template.t_page_creation_throttled_soft = 0; +#endif /* DEVELOPMENT || DEBUG */ + thread_template.t_page_creation_throttled = 0; thread_template.t_page_creation_count = 0; thread_template.t_page_creation_time = 0; thread_template.affinity_set = NULL; + thread_template.syscalls_unix = 0; + thread_template.syscalls_mach = 0; + + thread_template.t_ledger = LEDGER_NULL; + thread_template.t_threadledger = LEDGER_NULL; + thread_template.t_bankledger = LEDGER_NULL; + thread_template.t_deduct_bank_ledger_time = 0; + + thread_template.requested_policy = (struct thread_requested_policy) {}; + thread_template.effective_policy = (struct thread_effective_policy) {}; + + bzero(&thread_template.overrides, sizeof(thread_template.overrides)); + thread_template.sync_ipc_overrides = 0; + + thread_template.iotier_override = THROTTLE_LEVEL_NONE; + thread_template.thread_io_stats = NULL; +#if CONFIG_EMBEDDED + thread_template.taskwatch = NULL; +#endif /* CONFIG_EMBEDDED */ + thread_template.thread_callout_interrupt_wakeups = thread_template.thread_callout_platform_idle_wakeups = 0; + + thread_template.thread_timer_wakeups_bin_1 = thread_template.thread_timer_wakeups_bin_2 = 0; + thread_template.callout_woken_from_icontext = thread_template.callout_woken_from_platform_idle = 0; + + thread_template.thread_tag = 0; + + thread_template.ith_voucher_name = MACH_PORT_NULL; + thread_template.ith_voucher = IPC_VOUCHER_NULL; + + thread_template.th_work_interval = NULL; + init_thread = thread_template; machine_set_current_thread(&init_thread); } +extern boolean_t allow_qos_policy_set; + void thread_init(void) { @@ -259,18 +408,64 @@ thread_init(void) thread_max * sizeof(struct thread), THREAD_CHUNK * sizeof(struct thread), "threads"); - + + thread_qos_override_zone = zinit( + sizeof(struct thread_qos_override), + 4 * thread_max * sizeof(struct thread_qos_override), + PAGE_SIZE, + "thread qos override"); + zone_change(thread_qos_override_zone, Z_EXPAND, TRUE); + zone_change(thread_qos_override_zone, Z_COLLECT, TRUE); + zone_change(thread_qos_override_zone, Z_CALLERACCT, FALSE); + zone_change(thread_qos_override_zone, Z_NOENCRYPT, TRUE); + lck_grp_attr_setdefault(&thread_lck_grp_attr); lck_grp_init(&thread_lck_grp, "thread", &thread_lck_grp_attr); lck_attr_setdefault(&thread_lck_attr); - + stack_init(); + thread_policy_init(); + /* * Initialize any machine-dependent * per-thread structures necessary. */ machine_thread_init(); + + if (!PE_parse_boot_argn("cpumon_ustackshots_trigger_pct", &cpumon_ustackshots_trigger_pct, + sizeof (cpumon_ustackshots_trigger_pct))) { + cpumon_ustackshots_trigger_pct = CPUMON_USTACKSHOTS_TRIGGER_DEFAULT_PCT; + } + + PE_parse_boot_argn("-qos-policy-allow", &allow_qos_policy_set, sizeof(allow_qos_policy_set)); + + init_thread_ledgers(); +} + +boolean_t +thread_is_active(thread_t thread) +{ + return (thread->active); +} + +void +thread_corpse_continue(void) +{ + thread_t thread = current_thread(); + + thread_terminate_internal(thread); + + /* + * Handle the thread termination directly + * here instead of returning to userspace. + */ + assert(thread->active == FALSE); + thread_ast_clear(thread, AST_APC); + thread_apc_ast(thread); + + panic("thread_corpse_continue"); + /*NOTREACHED*/ } static void @@ -291,14 +486,14 @@ thread_terminate_self(void) spl_t s; int threadcnt; + pal_thread_terminate_self(thread); + DTRACE_PROC(lwp__exit); thread_mtx_lock(thread); - ulock_release_all(thread); - ipc_thread_disable(thread); - + thread_mtx_unlock(thread); s = splsched(); @@ -308,8 +503,11 @@ thread_terminate_self(void) * Cancel priority depression, wait for concurrent expirations * on other processors. */ - if (thread->sched_mode & TH_MODE_ISDEPRESSED) { - thread->sched_mode &= ~TH_MODE_ISDEPRESSED; + if (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) { + thread->sched_flags &= ~TH_SFLAG_DEPRESSED_MASK; + + /* If our priority was low because of a depressed yield, restore it in case we block below */ + thread_recompute_sched_pri(thread, FALSE); if (timer_call_cancel(&thread->depress_timer)) thread->depress_timer_active--; @@ -330,18 +528,79 @@ thread_terminate_self(void) thread_unlock(thread); splx(s); +#if CONFIG_EMBEDDED + thead_remove_taskwatch(thread); +#endif /* CONFIG_EMBEDDED */ + + work_interval_thread_terminate(thread); + + thread_mtx_lock(thread); + thread_policy_reset(thread); + thread_mtx_unlock(thread); + + bank_swap_thread_bank_ledger(thread, NULL); + task = thread->task; uthread_cleanup(task, thread->uthread, task->bsd_info); + + if (task->bsd_info && !task_is_exec_copy(task)) { + /* trace out pid before we sign off */ + long dbg_arg1 = 0; + long dbg_arg2 = 0; + + kdbg_trace_data(thread->task->bsd_info, &dbg_arg1, &dbg_arg2); + + KERNEL_DEBUG_CONSTANT(TRACE_DATA_THREAD_TERMINATE_PID | DBG_FUNC_NONE, + dbg_arg1, 0, 0, 0, 0); + } + + /* + * After this subtraction, this thread should never access + * task->bsd_info unless it got 0 back from the hw_atomic_sub. It + * could be racing with other threads to be the last thread in the + * process, and the last thread in the process will tear down the proc + * structure and zero-out task->bsd_info. + */ threadcnt = hw_atomic_sub(&task->active_thread_count, 1); /* * If we are the last thread to terminate and the task is * associated with a BSD process, perform BSD process exit. */ - if (threadcnt == 0 && task->bsd_info != NULL) + if (threadcnt == 0 && task->bsd_info != NULL && !task_is_exec_copy(task)) { + mach_exception_data_type_t subcode = 0; + { + /* since we're the last thread in this process, trace out the command name too */ + long dbg_arg1 = 0, dbg_arg2 = 0, dbg_arg3 = 0, dbg_arg4 = 0; + + kdbg_trace_string(thread->task->bsd_info, &dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4); + + KERNEL_DEBUG_CONSTANT(TRACE_STRING_PROC_EXIT | DBG_FUNC_NONE, + dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0); + } + + /* Get the exit reason before proc_exit */ + subcode = proc_encode_exit_exception_code(task->bsd_info); proc_exit(task->bsd_info); + /* + * if there is crash info in task + * then do the deliver action since this is + * last thread for this task. + */ + if (task->corpse_info) { + task_deliver_crash_notification(task, current_thread(), EXC_RESOURCE, subcode); + } + } + + if (threadcnt == 0) { + task_lock(task); + if (task_is_a_corpse_fork(task)) { + thread_wakeup((event_t)&task->active_thread_count); + } + task_unlock(task); + } uthread_cred_free(thread->uthread); @@ -373,8 +632,7 @@ thread_terminate_self(void) * If there is a reserved stack, release it. */ if (thread->reserved_stack != 0) { - if (thread->reserved_stack != thread->kernel_stack) - stack_free_stack(thread->reserved_stack); + stack_free_reserved(thread); thread->reserved_stack = 0; } @@ -383,7 +641,10 @@ thread_terminate_self(void) */ thread->state |= TH_TERMINATE; thread_mark_wait_locked(thread, THREAD_UNINT); + assert((thread->sched_flags & TH_SFLAG_PROMOTED) == 0); assert(thread->promotions == 0); + assert(!(thread->sched_flags & TH_SFLAG_WAITQ_PROMOTED)); + assert(thread->rwlock_count == 0); thread_unlock(thread); /* splsched */ @@ -391,20 +652,55 @@ thread_terminate_self(void) /*NOTREACHED*/ } +/* Drop a thread refcount that definitely isn't the last one. */ +void +thread_deallocate_safe(thread_t thread) +{ + assert_thread_magic(thread); + + uint32_t old_refcount = atomic_fetch_sub_explicit(&thread->ref_count, 1, memory_order_release); + + if (__improbable(old_refcount <= 1)) + panic("bad thread refcount: %d", old_refcount); +} + void thread_deallocate( thread_t thread) { task_t task; + __assert_only uint32_t th_ref_count; if (thread == THREAD_NULL) return; - if (thread_deallocate_internal(thread) > 0) - return; + assert_thread_magic(thread); + + if (__probable(atomic_fetch_sub_explicit(&thread->ref_count, 1, + memory_order_release) - 1 > 0)) { + return; + } + + th_ref_count = atomic_load_explicit(&thread->ref_count, memory_order_acquire); + assert(th_ref_count == 0); + + assert(thread_owned_workloops_count(thread) == 0); + + if (!(thread->state & TH_TERMINATE2)) + panic("thread_deallocate: thread not properly terminated\n"); + + assert(thread->runq == PROCESSOR_NULL); + + assert(thread->user_promotions == 0); + +#if KPC + kpc_thread_destroy(thread); +#endif ipc_thread_terminate(thread); + proc_thread_qos_deallocate(thread); + task = thread->task; #ifdef MACH_BSD @@ -416,7 +712,16 @@ thread_deallocate( } #endif /* MACH_BSD */ - task_deallocate(task); + if (thread->t_ledger) + ledger_dereference(thread->t_ledger); + if (thread->t_threadledger) + ledger_dereference(thread->t_threadledger); + + if (IPC_VOUCHER_NULL != thread->ith_voucher) + ipc_voucher_release(thread->ith_voucher); + + if (thread->thread_io_stats) + kfree(thread->thread_io_stats, sizeof(struct io_stat_info)); if (thread->kernel_stack != 0) stack_free(thread); @@ -424,9 +729,151 @@ thread_deallocate( lck_mtx_destroy(&thread->mutex, &thread_lck_grp); machine_thread_destroy(thread); + task_deallocate(task); + +#if MACH_ASSERT + assert_thread_magic(thread); + thread->thread_magic = 0; +#endif /* MACH_ASSERT */ + zfree(thread_zone, thread); } +void +thread_starts_owning_workloop(thread_t thread) +{ + atomic_fetch_add_explicit(&thread->kqwl_owning_count, 1, + memory_order_relaxed); +} + +void +thread_ends_owning_workloop(thread_t thread) +{ + __assert_only uint32_t count; + count = atomic_fetch_sub_explicit(&thread->kqwl_owning_count, 1, + memory_order_relaxed); + assert(count > 0); +} + +uint32_t +thread_owned_workloops_count(thread_t thread) +{ + return atomic_load_explicit(&thread->kqwl_owning_count, + memory_order_relaxed); +} + +/* + * thread_inspect_deallocate: + * + * Drop a thread inspection reference. + */ +void +thread_inspect_deallocate( + thread_inspect_t thread_inspect) +{ + return(thread_deallocate((thread_t)thread_inspect)); +} + +/* + * thread_exception_daemon: + * + * Deliver EXC_{RESOURCE,GUARD} exception + */ +static void +thread_exception_daemon(void) +{ + struct thread_exception_elt *elt; + task_t task; + thread_t thread; + exception_type_t etype; + + simple_lock(&thread_exception_lock); + while ((elt = (struct thread_exception_elt *)dequeue_head(&thread_exception_queue)) != NULL) { + simple_unlock(&thread_exception_lock); + + etype = elt->exception_type; + task = elt->exception_task; + thread = elt->exception_thread; + assert_thread_magic(thread); + + kfree(elt, sizeof (*elt)); + + /* wait for all the threads in the task to terminate */ + task_lock(task); + task_wait_till_threads_terminate_locked(task); + task_unlock(task); + + /* Consumes the task ref returned by task_generate_corpse_internal */ + task_deallocate(task); + /* Consumes the thread ref returned by task_generate_corpse_internal */ + thread_deallocate(thread); + + /* Deliver the notification, also clears the corpse. */ + task_deliver_crash_notification(task, thread, etype, 0); + + simple_lock(&thread_exception_lock); + } + + assert_wait((event_t)&thread_exception_queue, THREAD_UNINT); + simple_unlock(&thread_exception_lock); + + thread_block((thread_continue_t)thread_exception_daemon); +} + +/* + * thread_exception_enqueue: + * + * Enqueue a corpse port to be delivered an EXC_{RESOURCE,GUARD}. + */ +void +thread_exception_enqueue( + task_t task, + thread_t thread, + exception_type_t etype) +{ + assert(EXC_RESOURCE == etype || EXC_GUARD == etype); + struct thread_exception_elt *elt = kalloc(sizeof (*elt)); + elt->exception_type = etype; + elt->exception_task = task; + elt->exception_thread = thread; + + simple_lock(&thread_exception_lock); + enqueue_tail(&thread_exception_queue, (queue_entry_t)elt); + simple_unlock(&thread_exception_lock); + + thread_wakeup((event_t)&thread_exception_queue); +} + +/* + * thread_copy_resource_info + * + * Copy the resource info counters from source + * thread to destination thread. + */ +void +thread_copy_resource_info( + thread_t dst_thread, + thread_t src_thread) +{ + dst_thread->thread_tag = src_thread->thread_tag; + dst_thread->c_switch = src_thread->c_switch; + dst_thread->p_switch = src_thread->p_switch; + dst_thread->ps_switch = src_thread->ps_switch; + dst_thread->precise_user_kernel_time = src_thread->precise_user_kernel_time; + dst_thread->user_timer = src_thread->user_timer; + dst_thread->user_timer_save = src_thread->user_timer_save; + dst_thread->system_timer = src_thread->system_timer; + dst_thread->system_timer_save = src_thread->system_timer_save; + dst_thread->vtimer_user_save = src_thread->vtimer_user_save; + dst_thread->vtimer_prof_save = src_thread->vtimer_prof_save; + dst_thread->vtimer_rlim_save = src_thread->vtimer_rlim_save; + dst_thread->vtimer_qos_save = src_thread->vtimer_qos_save; + dst_thread->syscalls_unix = src_thread->syscalls_unix; + dst_thread->syscalls_mach = src_thread->syscalls_mach; + ledger_rollup(dst_thread->t_threadledger, src_thread->t_threadledger); + *dst_thread->thread_io_stats = *src_thread->thread_io_stats; +} + /* * thread_terminate_daemon: * @@ -435,13 +882,28 @@ thread_deallocate( static void thread_terminate_daemon(void) { - thread_t thread; - task_t task; + thread_t self, thread; + task_t task; + + self = current_thread(); + self->options |= TH_OPT_SYSTEM_CRITICAL; (void)splsched(); simple_lock(&thread_terminate_lock); - while ((thread = (thread_t)dequeue_head(&thread_terminate_queue)) != THREAD_NULL) { + while ((thread = qe_dequeue_head(&thread_terminate_queue, struct thread, runq_links)) != THREAD_NULL) { + assert_thread_magic(thread); + + /* + * if marked for crash reporting, skip reaping. + * The corpse delivery thread will clear bit and enqueue + * for reaping when done + */ + if (thread->inspection){ + enqueue_tail(&crashed_threads_queue, &thread->runq_links); + continue; + } + simple_unlock(&thread_terminate_lock); (void)spllo(); @@ -449,12 +911,31 @@ thread_terminate_daemon(void) task_lock(task); task->total_user_time += timer_grab(&thread->user_timer); - task->total_system_time += timer_grab(&thread->system_timer); + task->total_ptime += timer_grab(&thread->ptime); + if (thread->precise_user_kernel_time) { + task->total_system_time += timer_grab(&thread->system_timer); + } else { + task->total_user_time += timer_grab(&thread->system_timer); + } task->c_switch += thread->c_switch; task->p_switch += thread->p_switch; task->ps_switch += thread->ps_switch; + task->syscalls_unix += thread->syscalls_unix; + task->syscalls_mach += thread->syscalls_mach; + + task->task_timer_wakeups_bin_1 += thread->thread_timer_wakeups_bin_1; + task->task_timer_wakeups_bin_2 += thread->thread_timer_wakeups_bin_2; + task->task_gpu_ns += ml_gpu_stat(thread); + task->task_energy += ml_energy_stat(thread); + +#if MONOTONIC + mt_terminate_update(task, thread); +#endif /* MONOTONIC */ + + thread_update_qos_cpu_time(thread); + queue_remove(&task->threads, thread, thread_t, task_threads); task->thread_count--; @@ -482,6 +963,7 @@ thread_terminate_daemon(void) simple_unlock(&thread_terminate_lock); /* splsched */ + self->options &= ~TH_OPT_SYSTEM_CRITICAL; thread_block((thread_continue_t)thread_terminate_daemon); /*NOTREACHED*/ } @@ -497,13 +979,48 @@ void thread_terminate_enqueue( thread_t thread) { + KERNEL_DEBUG_CONSTANT(TRACE_DATA_THREAD_TERMINATE | DBG_FUNC_NONE, thread->thread_id, 0, 0, 0, 0); + simple_lock(&thread_terminate_lock); - enqueue_tail(&thread_terminate_queue, (queue_entry_t)thread); + enqueue_tail(&thread_terminate_queue, &thread->runq_links); simple_unlock(&thread_terminate_lock); thread_wakeup((event_t)&thread_terminate_queue); } +/* + * thread_terminate_crashed_threads: + * walk the list of crashed threads and put back set of threads + * who are no longer being inspected. + */ +void +thread_terminate_crashed_threads() +{ + thread_t th_remove; + boolean_t should_wake_terminate_queue = FALSE; + + simple_lock(&thread_terminate_lock); + /* + * loop through the crashed threads queue + * to put any threads that are not being inspected anymore + */ + + qe_foreach_element_safe(th_remove, &crashed_threads_queue, runq_links) { + /* make sure current_thread is never in crashed queue */ + assert(th_remove != current_thread()); + + if (th_remove->inspection == FALSE) { + re_queue_tail(&thread_terminate_queue, &th_remove->runq_links); + should_wake_terminate_queue = TRUE; + } + } + + simple_unlock(&thread_terminate_lock); + if (should_wake_terminate_queue == TRUE) { + thread_wakeup((event_t)&thread_terminate_queue); + } +} + /* * thread_stack_daemon: * @@ -514,25 +1031,33 @@ static void thread_stack_daemon(void) { thread_t thread; + spl_t s; + s = splsched(); simple_lock(&thread_stack_lock); - while ((thread = (thread_t)dequeue_head(&thread_stack_queue)) != THREAD_NULL) { + while ((thread = qe_dequeue_head(&thread_stack_queue, struct thread, runq_links)) != THREAD_NULL) { + assert_thread_magic(thread); + simple_unlock(&thread_stack_lock); + splx(s); + /* allocate stack with interrupts enabled so that we can call into VM */ stack_alloc(thread); + + KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED,MACH_STACK_WAIT) | DBG_FUNC_END, thread_tid(thread), 0, 0, 0, 0); - (void)splsched(); + s = splsched(); thread_lock(thread); thread_setrun(thread, SCHED_PREEMPT | SCHED_TAILQ); thread_unlock(thread); - (void)spllo(); simple_lock(&thread_stack_lock); } assert_wait((event_t)&thread_stack_queue, THREAD_UNINT); simple_unlock(&thread_stack_lock); + splx(s); thread_block((thread_continue_t)thread_stack_daemon); /*NOTREACHED*/ @@ -549,8 +1074,11 @@ void thread_stack_enqueue( thread_t thread) { + KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED,MACH_STACK_WAIT) | DBG_FUNC_START, thread_tid(thread), 0, 0, 0, 0); + assert_thread_magic(thread); + simple_lock(&thread_stack_lock); - enqueue_tail(&thread_stack_queue, (queue_entry_t)thread); + enqueue_tail(&thread_stack_queue, &thread->runq_links); simple_unlock(&thread_stack_lock); thread_wakeup((event_t)&thread_stack_queue); @@ -560,10 +1088,11 @@ void thread_daemon_init(void) { kern_return_t result; - thread_t thread; + thread_t thread = NULL; simple_lock_init(&thread_terminate_lock, 0); queue_init(&thread_terminate_queue); + queue_init(&crashed_threads_queue); result = kernel_thread_start_priority((thread_continue_t)thread_terminate_daemon, NULL, MINPRI_KERNEL, &thread); if (result != KERN_SUCCESS) @@ -574,16 +1103,31 @@ thread_daemon_init(void) simple_lock_init(&thread_stack_lock, 0); queue_init(&thread_stack_queue); - result = kernel_thread_start_priority((thread_continue_t)thread_stack_daemon, NULL, BASEPRI_PREEMPT, &thread); + result = kernel_thread_start_priority((thread_continue_t)thread_stack_daemon, NULL, BASEPRI_PREEMPT_HIGH, &thread); if (result != KERN_SUCCESS) panic("thread_daemon_init: thread_stack_daemon"); thread_deallocate(thread); + + simple_lock_init(&thread_exception_lock, 0); + queue_init(&thread_exception_queue); + + result = kernel_thread_start_priority((thread_continue_t)thread_exception_daemon, NULL, MINPRI_KERNEL, &thread); + if (result != KERN_SUCCESS) + panic("thread_daemon_init: thread_exception_daemon"); + + thread_deallocate(thread); } +#define TH_OPTION_NONE 0x00 +#define TH_OPTION_NOCRED 0x01 +#define TH_OPTION_NOSUSP 0x02 + /* * Create a new thread. * Doesn't start the thread running. + * + * Task and tasks_threads_lock are returned locked on success. */ static kern_return_t thread_create_internal( @@ -591,9 +1135,6 @@ thread_create_internal( integer_t priority, thread_continue_t continuation, int options, -#define TH_OPTION_NONE 0x00 -#define TH_OPTION_NOCRED 0x01 -#define TH_OPTION_NOSUSP 0x02 thread_t *out_thread) { thread_t new_thread; @@ -615,6 +1156,10 @@ thread_create_internal( #ifdef MACH_BSD new_thread->uthread = uthread_alloc(parent_task, new_thread, (options & TH_OPTION_NOCRED) != 0); if (new_thread->uthread == NULL) { +#if MACH_ASSERT + new_thread->thread_magic = 0; +#endif /* MACH_ASSERT */ + zfree(thread_zone, new_thread); return (KERN_RESOURCE_SHORTAGE); } @@ -631,11 +1176,15 @@ thread_create_internal( uthread_zone_free(ut); #endif /* MACH_BSD */ +#if MACH_ASSERT + new_thread->thread_magic = 0; +#endif /* MACH_ASSERT */ + zfree(thread_zone, new_thread); return (KERN_FAILURE); } - new_thread->task = parent_task; + new_thread->task = parent_task; thread_lock_init(new_thread); wake_lock_init(new_thread); @@ -643,18 +1192,34 @@ thread_create_internal( lck_mtx_init(&new_thread->mutex, &thread_lck_grp, &thread_lck_attr); ipc_thread_init(new_thread); - queue_init(&new_thread->held_ulocks); new_thread->continuation = continuation; + /* Allocate I/O Statistics structure */ + new_thread->thread_io_stats = (io_stat_info_t)kalloc(sizeof(struct io_stat_info)); + assert(new_thread->thread_io_stats != NULL); + bzero(new_thread->thread_io_stats, sizeof(struct io_stat_info)); + new_thread->sync_ipc_overrides = 0; + +#if KASAN + kasan_init_thread(&new_thread->kasan_data); +#endif + +#if CONFIG_IOSCHED + /* Clear out the I/O Scheduling info for AppleFSCompression */ + new_thread->decmp_upl = NULL; +#endif /* CONFIG_IOSCHED */ + lck_mtx_lock(&tasks_threads_lock); task_lock(parent_task); - if ( !parent_task->active || parent_task->halting || - ((options & TH_OPTION_NOSUSP) != 0 && - parent_task->suspend_count > 0) || - (parent_task->thread_count >= task_threadmax && - parent_task != kernel_task) ) { + /* + * Fail thread creation if parent task is being torn down or has too many threads + * If the caller asked for TH_OPTION_NOSUSP, also fail if the parent task is suspended + */ + if (parent_task->active == 0 || parent_task->halting || + (parent_task->suspend_count > 0 && (options & TH_OPTION_NOSUSP) != 0) || + (parent_task->thread_count >= task_threadmax && parent_task != kernel_task)) { task_unlock(parent_task); lck_mtx_unlock(&tasks_threads_lock); @@ -671,6 +1236,7 @@ thread_create_internal( #endif /* MACH_BSD */ ipc_thread_disable(new_thread); ipc_thread_terminate(new_thread); + kfree(new_thread->thread_io_stats, sizeof(struct io_stat_info)); lck_mtx_destroy(&new_thread->mutex, &thread_lck_grp); machine_thread_destroy(new_thread); zfree(thread_zone, new_thread); @@ -682,67 +1248,130 @@ thread_create_internal( task_reference_internal(parent_task); + if (new_thread->task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_PERTHR_LIMIT) { + /* + * This task has a per-thread CPU limit; make sure this new thread + * gets its limit set too, before it gets out of the kernel. + */ + set_astledger(new_thread); + } + + /* Instantiate a thread ledger. Do not fail thread creation if ledger creation fails. */ + if ((new_thread->t_threadledger = ledger_instantiate(thread_ledger_template, + LEDGER_CREATE_INACTIVE_ENTRIES)) != LEDGER_NULL) { + + ledger_entry_setactive(new_thread->t_threadledger, thread_ledgers.cpu_time); + } + + new_thread->t_bankledger = LEDGER_NULL; + new_thread->t_deduct_bank_ledger_time = 0; + new_thread->t_deduct_bank_ledger_energy = 0; + + new_thread->t_ledger = new_thread->task->ledger; + if (new_thread->t_ledger) + ledger_reference(new_thread->t_ledger); + +#if defined(CONFIG_SCHED_MULTIQ) + /* Cache the task's sched_group */ + new_thread->sched_group = parent_task->sched_group; +#endif /* defined(CONFIG_SCHED_MULTIQ) */ + /* Cache the task's map */ new_thread->map = parent_task->map; - /* Chain the thread onto the task's list */ + timer_call_setup(&new_thread->wait_timer, thread_timer_expire, new_thread); + timer_call_setup(&new_thread->depress_timer, thread_depress_expire, new_thread); + +#if KPC + kpc_thread_create(new_thread); +#endif + + /* Set the thread's scheduling parameters */ + new_thread->sched_mode = SCHED(initial_thread_sched_mode)(parent_task); + new_thread->max_priority = parent_task->max_priority; + new_thread->task_priority = parent_task->priority; + + int new_priority = (priority < 0) ? parent_task->priority: priority; + new_priority = (priority < 0)? parent_task->priority: priority; + if (new_priority > new_thread->max_priority) + new_priority = new_thread->max_priority; +#if CONFIG_EMBEDDED + if (new_priority < MAXPRI_THROTTLE) { + new_priority = MAXPRI_THROTTLE; + } +#endif /* CONFIG_EMBEDDED */ + + new_thread->importance = new_priority - new_thread->task_priority; + + sched_set_thread_base_priority(new_thread, new_priority); + +#if defined(CONFIG_SCHED_TIMESHARE_CORE) + new_thread->sched_stamp = sched_tick; + new_thread->pri_shift = sched_pri_shifts[new_thread->th_sched_bucket]; +#endif /* defined(CONFIG_SCHED_TIMESHARE_CORE) */ + +#if CONFIG_EMBEDDED + if (parent_task->max_priority <= MAXPRI_THROTTLE) + sched_thread_mode_demote(new_thread, TH_SFLAG_THROTTLED); +#endif /* CONFIG_EMBEDDED */ + + thread_policy_create(new_thread); + + /* Chain the thread onto the task's list */ queue_enter(&parent_task->threads, new_thread, thread_t, task_threads); parent_task->thread_count++; - + /* So terminating threads don't need to take the task lock to decrement */ hw_atomic_add(&parent_task->active_thread_count, 1); /* Protected by the tasks_threads_lock */ new_thread->thread_id = ++thread_unique_id; + queue_enter(&threads, new_thread, thread_t, threads); threads_count++; - timer_call_setup(&new_thread->wait_timer, thread_timer_expire, new_thread); - timer_call_setup(&new_thread->depress_timer, thread_depress_expire, new_thread); - -#if CONFIG_COUNTERS - /* - * If parent task has any reservations, they need to be propagated to this - * thread. - */ - new_thread->t_chud = (TASK_PMC_FLAG == (parent_task->t_chud & TASK_PMC_FLAG)) ? - THREAD_PMC_FLAG : 0U; -#endif - - /* Set the thread's scheduling parameters */ - if (parent_task != kernel_task) - new_thread->sched_mode |= TH_MODE_TIMESHARE; - new_thread->max_priority = parent_task->max_priority; - new_thread->task_priority = parent_task->priority; - new_thread->priority = (priority < 0)? parent_task->priority: priority; - if (new_thread->priority > new_thread->max_priority) - new_thread->priority = new_thread->max_priority; - new_thread->importance = - new_thread->priority - new_thread->task_priority; - new_thread->sched_stamp = sched_tick; - new_thread->pri_shift = sched_pri_shift; - compute_priority(new_thread, FALSE); - new_thread->active = TRUE; - + if (task_is_a_corpse_fork(parent_task)) { + /* Set the inspection bit if the task is a corpse fork */ + new_thread->inspection = TRUE; + } else { + new_thread->inspection = FALSE; + } + new_thread->corpse_dup = FALSE; *out_thread = new_thread; { long dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4; - kdbg_trace_data(parent_task->bsd_info, &dbg_arg2); + kdbg_trace_data(parent_task->bsd_info, &dbg_arg2, &dbg_arg4); + + /* + * Starting with 26604425, exec'ing creates a new task/thread. + * + * NEWTHREAD in the current process has two possible meanings: + * + * 1) Create a new thread for this process. + * 2) Create a new thread for the future process this will become in an exec. + * + * To disambiguate these, arg3 will be set to TRUE for case #2. + * + * The value we need to find (TPF_EXEC_COPY) is stable in the case of a + * task exec'ing. The read of t_procflags does not take the proc_lock. + */ + dbg_arg3 = (task_is_exec_copy(parent_task)) ? TRUE : 0; + - KERNEL_DEBUG_CONSTANT( - TRACEDBG_CODE(DBG_TRACE_DATA, 1) | DBG_FUNC_NONE, - (vm_address_t)(uintptr_t)thread_tid(new_thread), dbg_arg2, 0, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + TRACE_DATA_NEWTHREAD | DBG_FUNC_NONE, + (vm_address_t)(uintptr_t)thread_tid(new_thread), dbg_arg2, dbg_arg3, dbg_arg4, 0); kdbg_trace_string(parent_task->bsd_info, &dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4); - KERNEL_DEBUG_CONSTANT( - TRACEDBG_CODE(DBG_TRACE_STRING, 1) | DBG_FUNC_NONE, - dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + TRACE_STRING_NEWTHREAD | DBG_FUNC_NONE, + dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0); } DTRACE_PROC1(lwp__create, thread_t, *out_thread); @@ -750,10 +1379,12 @@ thread_create_internal( return (KERN_SUCCESS); } -kern_return_t -thread_create( +static kern_return_t +thread_create_internal2( task_t task, - thread_t *new_thread) + thread_t *new_thread, + boolean_t from_user, + thread_continue_t continuation) { kern_return_t result; thread_t thread; @@ -761,7 +1392,7 @@ thread_create( if (task == TASK_NULL || task == kernel_task) return (KERN_INVALID_ARGUMENT); - result = thread_create_internal(task, -1, (thread_continue_t)thread_bootstrap_return, TH_OPTION_NONE, &thread); + result = thread_create_internal(task, -1, continuation, TH_OPTION_NONE, &thread); if (result != KERN_SUCCESS) return (result); @@ -770,6 +1401,9 @@ thread_create( if (task->suspend_count > 0) thread_hold(thread); + if (from_user) + extmod_statistics_incr_thread_create(task); + task_unlock(task); lck_mtx_unlock(&tasks_threads_lock); @@ -778,15 +1412,97 @@ thread_create( return (KERN_SUCCESS); } +/* No prototype, since task_server.h has the _from_user version if KERNEL_SERVER */ kern_return_t -thread_create_running( - register task_t task, +thread_create( + task_t task, + thread_t *new_thread); + +kern_return_t +thread_create( + task_t task, + thread_t *new_thread) +{ + return thread_create_internal2(task, new_thread, FALSE, (thread_continue_t)thread_bootstrap_return); +} + +kern_return_t +thread_create_from_user( + task_t task, + thread_t *new_thread) +{ + return thread_create_internal2(task, new_thread, TRUE, (thread_continue_t)thread_bootstrap_return); +} + +kern_return_t +thread_create_with_continuation( + task_t task, + thread_t *new_thread, + thread_continue_t continuation) +{ + return thread_create_internal2(task, new_thread, FALSE, continuation); +} + +/* + * Create a thread that is already started, but is waiting on an event + */ +static kern_return_t +thread_create_waiting_internal( + task_t task, + thread_continue_t continuation, + event_t event, + int options, + thread_t *new_thread) +{ + kern_return_t result; + thread_t thread; + + if (task == TASK_NULL || task == kernel_task) + return (KERN_INVALID_ARGUMENT); + + result = thread_create_internal(task, -1, continuation, options, &thread); + if (result != KERN_SUCCESS) + return (result); + + /* note no user_stop_count or thread_hold here */ + + if (task->suspend_count > 0) + thread_hold(thread); + + thread_mtx_lock(thread); + thread_start_in_assert_wait(thread, event, THREAD_INTERRUPTIBLE); + thread_mtx_unlock(thread); + + task_unlock(task); + lck_mtx_unlock(&tasks_threads_lock); + + *new_thread = thread; + + return (KERN_SUCCESS); +} + +kern_return_t +thread_create_waiting( + task_t task, + thread_continue_t continuation, + event_t event, + thread_t *new_thread) +{ + return thread_create_waiting_internal(task, continuation, event, + TH_OPTION_NONE, new_thread); +} + + +static kern_return_t +thread_create_running_internal2( + task_t task, int flavor, thread_state_t new_state, mach_msg_type_number_t new_state_count, - thread_t *new_thread) + thread_t *new_thread, + boolean_t from_user) { - register kern_return_t result; + kern_return_t result; thread_t thread; if (task == TASK_NULL || task == kernel_task) @@ -796,8 +1512,10 @@ thread_create_running( if (result != KERN_SUCCESS) return (result); - result = machine_thread_set_state( - thread, flavor, new_state, new_state_count); + if (task->suspend_count > 0) + thread_hold(thread); + + result = machine_thread_set_state(thread, flavor, new_state, new_state_count); if (result != KERN_SUCCESS) { task_unlock(task); lck_mtx_unlock(&tasks_threads_lock); @@ -808,9 +1526,12 @@ thread_create_running( } thread_mtx_lock(thread); - thread_start_internal(thread); + thread_start(thread); thread_mtx_unlock(thread); + if (from_user) + extmod_statistics_incr_thread_create(task); + task_unlock(task); lck_mtx_unlock(&tasks_threads_lock); @@ -819,9 +1540,45 @@ thread_create_running( return (result); } +/* Prototype, see justification above */ +kern_return_t +thread_create_running( + task_t task, + int flavor, + thread_state_t new_state, + mach_msg_type_number_t new_state_count, + thread_t *new_thread); + +kern_return_t +thread_create_running( + task_t task, + int flavor, + thread_state_t new_state, + mach_msg_type_number_t new_state_count, + thread_t *new_thread) +{ + return thread_create_running_internal2( + task, flavor, new_state, new_state_count, + new_thread, FALSE); +} + +kern_return_t +thread_create_running_from_user( + task_t task, + int flavor, + thread_state_t new_state, + mach_msg_type_number_t new_state_count, + thread_t *new_thread) +{ + return thread_create_running_internal2( + task, flavor, new_state, new_state_count, + new_thread, TRUE); +} + kern_return_t thread_create_workq( task_t task, + thread_continue_t thread_return, thread_t *new_thread) { kern_return_t result; @@ -830,8 +1587,7 @@ thread_create_workq( if (task == TASK_NULL || task == kernel_task) return (KERN_INVALID_ARGUMENT); - result = thread_create_internal(task, -1, (thread_continue_t)thread_bootstrap_return, - TH_OPTION_NOCRED | TH_OPTION_NOSUSP, &thread); + result = thread_create_internal(task, -1, thread_return, TH_OPTION_NOCRED | TH_OPTION_NOSUSP, &thread); if (result != KERN_SUCCESS) return (result); @@ -848,6 +1604,19 @@ thread_create_workq( return (KERN_SUCCESS); } +kern_return_t +thread_create_workq_waiting( + task_t task, + thread_continue_t continuation, + event_t event, + thread_t *new_thread) +{ + + return thread_create_waiting_internal(task, continuation, event, + TH_OPTION_NOCRED | TH_OPTION_NOSUSP, + new_thread); +} + /* * kernel_thread_create: * @@ -865,7 +1634,7 @@ kernel_thread_create( thread_t thread; task_t task = kernel_task; - result = thread_create_internal(task, priority, continuation, TH_OPTION_NONE, &thread); + result = thread_create_internal(task, priority, continuation, TH_OPTION_NOCRED | TH_OPTION_NONE, &thread); if (result != KERN_SUCCESS) return (result); @@ -905,7 +1674,7 @@ kernel_thread_start_priority( *new_thread = thread; thread_mtx_lock(thread); - thread_start_internal(thread); + thread_start(thread); thread_mtx_unlock(thread); return (result); @@ -920,146 +1689,129 @@ kernel_thread_start( return kernel_thread_start_priority(continuation, parameter, -1, new_thread); } -#ifndef __LP64__ - -thread_t -kernel_thread( - task_t task, - void (*start)(void)) +/* Separated into helper function so it can be used by THREAD_BASIC_INFO and THREAD_EXTENDED_INFO */ +/* it is assumed that the thread is locked by the caller */ +static void +retrieve_thread_basic_info(thread_t thread, thread_basic_info_t basic_info) { - kern_return_t result; - thread_t thread; + int state, flags; - if (task != kernel_task) - panic("kernel_thread"); + /* fill in info */ - result = kernel_thread_start_priority((thread_continue_t)start, NULL, -1, &thread); - if (result != KERN_SUCCESS) - return (THREAD_NULL); + thread_read_times(thread, &basic_info->user_time, + &basic_info->system_time); - thread_deallocate(thread); + /* + * Update lazy-evaluated scheduler info because someone wants it. + */ + if (SCHED(can_update_priority)(thread)) + SCHED(update_priority)(thread); - return (thread); -} + basic_info->sleep_time = 0; + + /* + * To calculate cpu_usage, first correct for timer rate, + * then for 5/8 ageing. The correction factor [3/5] is + * (1/(5/8) - 1). + */ + basic_info->cpu_usage = 0; +#if defined(CONFIG_SCHED_TIMESHARE_CORE) + if (sched_tick_interval) { + basic_info->cpu_usage = (integer_t)(((uint64_t)thread->cpu_usage + * TH_USAGE_SCALE) / sched_tick_interval); + basic_info->cpu_usage = (basic_info->cpu_usage * 3) / 5; + } +#endif + + if (basic_info->cpu_usage > TH_USAGE_SCALE) + basic_info->cpu_usage = TH_USAGE_SCALE; + + basic_info->policy = ((thread->sched_mode == TH_MODE_TIMESHARE)? + POLICY_TIMESHARE: POLICY_RR); + + flags = 0; + if (thread->options & TH_OPT_IDLE_THREAD) + flags |= TH_FLAGS_IDLE; + + if (thread->options & TH_OPT_GLOBAL_FORCED_IDLE) { + flags |= TH_FLAGS_GLOBAL_FORCED_IDLE; + } + + if (!thread->kernel_stack) + flags |= TH_FLAGS_SWAPPED; + + state = 0; + if (thread->state & TH_TERMINATE) + state = TH_STATE_HALTED; + else + if (thread->state & TH_RUN) + state = TH_STATE_RUNNING; + else + if (thread->state & TH_UNINT) + state = TH_STATE_UNINTERRUPTIBLE; + else + if (thread->state & TH_SUSP) + state = TH_STATE_STOPPED; + else + if (thread->state & TH_WAIT) + state = TH_STATE_WAITING; + + basic_info->run_state = state; + basic_info->flags = flags; -#endif /* __LP64__ */ + basic_info->suspend_count = thread->user_stop_count; + + return; +} kern_return_t thread_info_internal( - register thread_t thread, + thread_t thread, thread_flavor_t flavor, thread_info_t thread_info_out, /* ptr to OUT array */ mach_msg_type_number_t *thread_info_count) /*IN/OUT*/ { - int state, flags; - spl_t s; + spl_t s; if (thread == THREAD_NULL) return (KERN_INVALID_ARGUMENT); if (flavor == THREAD_BASIC_INFO) { - register thread_basic_info_t basic_info; - if (*thread_info_count < THREAD_BASIC_INFO_COUNT) + if (*thread_info_count < THREAD_BASIC_INFO_COUNT) return (KERN_INVALID_ARGUMENT); - basic_info = (thread_basic_info_t) thread_info_out; - - s = splsched(); - thread_lock(thread); - - /* fill in info */ - - thread_read_times(thread, &basic_info->user_time, - &basic_info->system_time); - - /* - * Update lazy-evaluated scheduler info because someone wants it. - */ - if (thread->sched_stamp != sched_tick) - update_priority(thread); - - basic_info->sleep_time = 0; - - /* - * To calculate cpu_usage, first correct for timer rate, - * then for 5/8 ageing. The correction factor [3/5] is - * (1/(5/8) - 1). - */ - basic_info->cpu_usage = (integer_t)(((uint64_t)thread->cpu_usage - * TH_USAGE_SCALE) / sched_tick_interval); - basic_info->cpu_usage = (basic_info->cpu_usage * 3) / 5; - - if (basic_info->cpu_usage > TH_USAGE_SCALE) - basic_info->cpu_usage = TH_USAGE_SCALE; - - basic_info->policy = ((thread->sched_mode & TH_MODE_TIMESHARE)? - POLICY_TIMESHARE: POLICY_RR); - - flags = 0; - if (thread->bound_processor != PROCESSOR_NULL && thread->bound_processor->idle_thread == thread) - flags |= TH_FLAGS_IDLE; - - if (!thread->kernel_stack) - flags |= TH_FLAGS_SWAPPED; - - state = 0; - if (thread->state & TH_TERMINATE) - state = TH_STATE_HALTED; - else - if (thread->state & TH_RUN) - state = TH_STATE_RUNNING; - else - if (thread->state & TH_UNINT) - state = TH_STATE_UNINTERRUPTIBLE; - else - if (thread->state & TH_SUSP) - state = TH_STATE_STOPPED; - else - if (thread->state & TH_WAIT) - state = TH_STATE_WAITING; - - basic_info->run_state = state; - basic_info->flags = flags; + s = splsched(); + thread_lock(thread); - basic_info->suspend_count = thread->user_stop_count; + retrieve_thread_basic_info(thread, (thread_basic_info_t) thread_info_out); - thread_unlock(thread); - splx(s); + thread_unlock(thread); + splx(s); - *thread_info_count = THREAD_BASIC_INFO_COUNT; + *thread_info_count = THREAD_BASIC_INFO_COUNT; - return (KERN_SUCCESS); + return (KERN_SUCCESS); } else if (flavor == THREAD_IDENTIFIER_INFO) { - register thread_identifier_info_t identifier_info; + thread_identifier_info_t identifier_info; - if (*thread_info_count < THREAD_IDENTIFIER_INFO_COUNT) + if (*thread_info_count < THREAD_IDENTIFIER_INFO_COUNT) return (KERN_INVALID_ARGUMENT); - identifier_info = (thread_identifier_info_t) thread_info_out; + identifier_info = (thread_identifier_info_t) thread_info_out; - s = splsched(); - thread_lock(thread); + s = splsched(); + thread_lock(thread); - identifier_info->thread_id = thread->thread_id; -#if defined(__ppc__) || defined(__arm__) - identifier_info->thread_handle = thread->machine.cthread_self; -#else - identifier_info->thread_handle = thread->machine.pcb->cthread_self; -#endif - if(thread->task->bsd_info) { - identifier_info->dispatch_qaddr = identifier_info->thread_handle + get_dispatchqueue_offset_from_proc(thread->task->bsd_info); - } else { - thread_unlock(thread); - splx(s); - return KERN_INVALID_ARGUMENT; - } + identifier_info->thread_id = thread->thread_id; + identifier_info->thread_handle = thread->machine.cthread_self; + identifier_info->dispatch_qaddr = thread_dispatchqaddr(thread); - thread_unlock(thread); - splx(s); - return KERN_SUCCESS; + thread_unlock(thread); + splx(s); + return KERN_SUCCESS; } else if (flavor == THREAD_SCHED_TIMESHARE_INFO) { @@ -1070,23 +1822,22 @@ thread_info_internal( ts_info = (policy_timeshare_info_t)thread_info_out; - s = splsched(); + s = splsched(); thread_lock(thread); - if (!(thread->sched_mode & TH_MODE_TIMESHARE)) { - thread_unlock(thread); + if (thread->sched_mode != TH_MODE_TIMESHARE) { + thread_unlock(thread); splx(s); - return (KERN_INVALID_POLICY); - } + } - ts_info->depressed = (thread->sched_mode & TH_MODE_ISDEPRESSED) != 0; + ts_info->depressed = (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) != 0; if (ts_info->depressed) { ts_info->base_priority = DEPRESSPRI; - ts_info->depress_priority = thread->priority; + ts_info->depress_priority = thread->base_pri; } else { - ts_info->base_priority = thread->priority; + ts_info->base_priority = thread->base_pri; ts_info->depress_priority = -1; } @@ -1094,11 +1845,11 @@ thread_info_internal( ts_info->max_priority = thread->max_priority; thread_unlock(thread); - splx(s); + splx(s); *thread_info_count = POLICY_TIMESHARE_INFO_COUNT; - return (KERN_SUCCESS); + return (KERN_SUCCESS); } else if (flavor == THREAD_SCHED_FIFO_INFO) { @@ -1110,41 +1861,101 @@ thread_info_internal( else if (flavor == THREAD_SCHED_RR_INFO) { policy_rr_info_t rr_info; + uint32_t quantum_time; + uint64_t quantum_ns; if (*thread_info_count < POLICY_RR_INFO_COUNT) return (KERN_INVALID_ARGUMENT); rr_info = (policy_rr_info_t) thread_info_out; - s = splsched(); + s = splsched(); thread_lock(thread); - if (thread->sched_mode & TH_MODE_TIMESHARE) { - thread_unlock(thread); + if (thread->sched_mode == TH_MODE_TIMESHARE) { + thread_unlock(thread); splx(s); return (KERN_INVALID_POLICY); } - rr_info->depressed = (thread->sched_mode & TH_MODE_ISDEPRESSED) != 0; + rr_info->depressed = (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK) != 0; if (rr_info->depressed) { rr_info->base_priority = DEPRESSPRI; - rr_info->depress_priority = thread->priority; + rr_info->depress_priority = thread->base_pri; } else { - rr_info->base_priority = thread->priority; + rr_info->base_priority = thread->base_pri; rr_info->depress_priority = -1; } + quantum_time = SCHED(initial_quantum_size)(THREAD_NULL); + absolutetime_to_nanoseconds(quantum_time, &quantum_ns); + rr_info->max_priority = thread->max_priority; - rr_info->quantum = std_quantum_us / 1000; + rr_info->quantum = (uint32_t)(quantum_ns / 1000 / 1000); thread_unlock(thread); - splx(s); + splx(s); *thread_info_count = POLICY_RR_INFO_COUNT; - return (KERN_SUCCESS); + return (KERN_SUCCESS); + } + else + if (flavor == THREAD_EXTENDED_INFO) { + thread_basic_info_data_t basic_info; + thread_extended_info_t extended_info = (thread_extended_info_t) thread_info_out; + + if (*thread_info_count < THREAD_EXTENDED_INFO_COUNT) { + return (KERN_INVALID_ARGUMENT); + } + + s = splsched(); + thread_lock(thread); + + /* NOTE: This mimics fill_taskthreadinfo(), which is the function used by proc_pidinfo() for + * the PROC_PIDTHREADINFO flavor (which can't be used on corpses) + */ + retrieve_thread_basic_info(thread, &basic_info); + extended_info->pth_user_time = ((basic_info.user_time.seconds * (integer_t)NSEC_PER_SEC) + (basic_info.user_time.microseconds * (integer_t)NSEC_PER_USEC)); + extended_info->pth_system_time = ((basic_info.system_time.seconds * (integer_t)NSEC_PER_SEC) + (basic_info.system_time.microseconds * (integer_t)NSEC_PER_USEC)); + + extended_info->pth_cpu_usage = basic_info.cpu_usage; + extended_info->pth_policy = basic_info.policy; + extended_info->pth_run_state = basic_info.run_state; + extended_info->pth_flags = basic_info.flags; + extended_info->pth_sleep_time = basic_info.sleep_time; + extended_info->pth_curpri = thread->sched_pri; + extended_info->pth_priority = thread->base_pri; + extended_info->pth_maxpriority = thread->max_priority; + + bsd_getthreadname(thread->uthread,extended_info->pth_name); + + thread_unlock(thread); + splx(s); + + *thread_info_count = THREAD_EXTENDED_INFO_COUNT; + + return (KERN_SUCCESS); + } + else + if (flavor == THREAD_DEBUG_INFO_INTERNAL) { +#if DEVELOPMENT || DEBUG + thread_debug_info_internal_t dbg_info; + if (*thread_info_count < THREAD_DEBUG_INFO_INTERNAL_COUNT) + return (KERN_NOT_SUPPORTED); + + if (thread_info_out == NULL) + return (KERN_INVALID_ARGUMENT); + + dbg_info = (thread_debug_info_internal_t) thread_info_out; + dbg_info->page_creation_count = thread->t_page_creation_count; + + *thread_info_count = THREAD_DEBUG_INFO_INTERNAL_COUNT; + return (KERN_SUCCESS); +#endif /* DEVELOPMENT || DEBUG */ + return (KERN_NOT_SUPPORTED); } return (KERN_INVALID_ARGUMENT); @@ -1158,14 +1969,48 @@ thread_read_times( { clock_sec_t secs; clock_usec_t usecs; + uint64_t tval_user, tval_system; + + tval_user = timer_grab(&thread->user_timer); + tval_system = timer_grab(&thread->system_timer); + + if (thread->precise_user_kernel_time) { + absolutetime_to_microtime(tval_user, &secs, &usecs); + user_time->seconds = (typeof(user_time->seconds))secs; + user_time->microseconds = usecs; + + absolutetime_to_microtime(tval_system, &secs, &usecs); + system_time->seconds = (typeof(system_time->seconds))secs; + system_time->microseconds = usecs; + } else { + /* system_timer may represent either sys or user */ + tval_user += tval_system; + absolutetime_to_microtime(tval_user, &secs, &usecs); + user_time->seconds = (typeof(user_time->seconds))secs; + user_time->microseconds = usecs; + + system_time->seconds = 0; + system_time->microseconds = 0; + } +} + +uint64_t thread_get_runtime_self(void) +{ + boolean_t interrupt_state; + uint64_t runtime; + thread_t thread = NULL; + processor_t processor = NULL; + + thread = current_thread(); - absolutetime_to_microtime(timer_grab(&thread->user_timer), &secs, &usecs); - user_time->seconds = (typeof(user_time->seconds))secs; - user_time->microseconds = usecs; + /* Not interrupt safe, as the scheduler may otherwise update timer values underneath us */ + interrupt_state = ml_set_interrupts_enabled(FALSE); + processor = current_processor(); + timer_switch(PROCESSOR_DATA(processor, thread_timer), mach_absolute_time(), PROCESSOR_DATA(processor, thread_timer)); + runtime = (timer_grab(&thread->user_timer) + timer_grab(&thread->system_timer)); + ml_set_interrupts_enabled(interrupt_state); - absolutetime_to_microtime(timer_grab(&thread->system_timer), &secs, &usecs); - system_time->seconds = (typeof(system_time->seconds))secs; - system_time->microseconds = usecs; + return runtime; } kern_return_t @@ -1257,121 +2102,489 @@ thread_wire( return (thread_wire_internal(host_priv, thread, wired, NULL)); } -int split_funnel_off = 0; -lck_grp_t *funnel_lck_grp = LCK_GRP_NULL; -lck_grp_attr_t *funnel_lck_grp_attr; -lck_attr_t *funnel_lck_attr; -funnel_t * -funnel_alloc( - int type) +boolean_t +is_vm_privileged(void) { - lck_mtx_t *m; - funnel_t *fnl; + return current_thread()->options & TH_OPT_VMPRIV ? TRUE : FALSE; +} - if (funnel_lck_grp == LCK_GRP_NULL) { - funnel_lck_grp_attr = lck_grp_attr_alloc_init(); +boolean_t +set_vm_privilege(boolean_t privileged) +{ + boolean_t was_vmpriv; - funnel_lck_grp = lck_grp_alloc_init("Funnel", funnel_lck_grp_attr); + if (current_thread()->options & TH_OPT_VMPRIV) + was_vmpriv = TRUE; + else + was_vmpriv = FALSE; - funnel_lck_attr = lck_attr_alloc_init(); - } - if ((fnl = (funnel_t *)kalloc(sizeof(funnel_t))) != 0){ - bzero((void *)fnl, sizeof(funnel_t)); - if ((m = lck_mtx_alloc_init(funnel_lck_grp, funnel_lck_attr)) == (lck_mtx_t *)NULL) { - kfree(fnl, sizeof(funnel_t)); - return(THR_FUNNEL_NULL); - } - fnl->fnl_mutex = m; - fnl->fnl_type = type; - } - return(fnl); -} + if (privileged != FALSE) + current_thread()->options |= TH_OPT_VMPRIV; + else + current_thread()->options &= ~TH_OPT_VMPRIV; -void -funnel_free( - funnel_t * fnl) -{ - lck_mtx_free(fnl->fnl_mutex, funnel_lck_grp); - if (fnl->fnl_oldmutex) - lck_mtx_free(fnl->fnl_oldmutex, funnel_lck_grp); - kfree(fnl, sizeof(funnel_t)); + return (was_vmpriv); } -void -funnel_lock( - funnel_t * fnl) +void +set_thread_rwlock_boost(void) { - lck_mtx_lock(fnl->fnl_mutex); - fnl->fnl_mtxholder = current_thread(); + current_thread()->rwlock_count++; } -void -funnel_unlock( - funnel_t * fnl) +void +clear_thread_rwlock_boost(void) { - lck_mtx_unlock(fnl->fnl_mutex); - fnl->fnl_mtxholder = NULL; - fnl->fnl_mtxrelease = current_thread(); -} + thread_t thread = current_thread(); -funnel_t * -thread_funnel_get( - void) -{ - thread_t th = current_thread(); + if ((thread->rwlock_count-- == 1) && (thread->sched_flags & TH_SFLAG_RW_PROMOTED)) { - if (th->funnel_state & TH_FN_OWNED) { - return(th->funnel_lock); + lck_rw_clear_promotion(thread); } - return(THR_FUNNEL_NULL); } -boolean_t -thread_funnel_set( - funnel_t * fnl, - boolean_t funneled) -{ - thread_t cur_thread; - boolean_t funnel_state_prev; - boolean_t intr; - - cur_thread = current_thread(); - funnel_state_prev = ((cur_thread->funnel_state & TH_FN_OWNED) == TH_FN_OWNED); - - if (funnel_state_prev != funneled) { - intr = ml_set_interrupts_enabled(FALSE); - - if (funneled == TRUE) { - if (cur_thread->funnel_lock) - panic("Funnel lock called when holding one %p", cur_thread->funnel_lock); - KERNEL_DEBUG(0x6032428 | DBG_FUNC_NONE, - fnl, 1, 0, 0, 0); - funnel_lock(fnl); - KERNEL_DEBUG(0x6032434 | DBG_FUNC_NONE, - fnl, 1, 0, 0, 0); - cur_thread->funnel_state |= TH_FN_OWNED; - cur_thread->funnel_lock = fnl; - } else { - if(cur_thread->funnel_lock->fnl_mutex != fnl->fnl_mutex) - panic("Funnel unlock when not holding funnel"); - cur_thread->funnel_state &= ~TH_FN_OWNED; - KERNEL_DEBUG(0x603242c | DBG_FUNC_NONE, - fnl, 1, 0, 0, 0); - - cur_thread->funnel_lock = THR_FUNNEL_NULL; - funnel_unlock(fnl); - } - (void)ml_set_interrupts_enabled(intr); + +/* + * XXX assuming current thread only, for now... + */ +void +thread_guard_violation(thread_t thread, + mach_exception_data_type_t code, mach_exception_data_type_t subcode) +{ + assert(thread == current_thread()); + assert(thread->task != kernel_task); + + spl_t s = splsched(); + /* + * Use the saved state area of the thread structure + * to store all info required to handle the AST when + * returning to userspace + */ + assert(EXC_GUARD_DECODE_GUARD_TYPE(code)); + thread->guard_exc_info.code = code; + thread->guard_exc_info.subcode = subcode; + thread_ast_set(thread, AST_GUARD); + ast_propagate(thread); + + splx(s); +} + +/* + * guard_ast: + * + * Handle AST_GUARD for a thread. This routine looks at the + * state saved in the thread structure to determine the cause + * of this exception. Based on this value, it invokes the + * appropriate routine which determines other exception related + * info and raises the exception. + */ +void +guard_ast(thread_t t) +{ + const mach_exception_data_type_t + code = t->guard_exc_info.code, + subcode = t->guard_exc_info.subcode; + + switch (EXC_GUARD_DECODE_GUARD_TYPE(code)) { + case GUARD_TYPE_MACH_PORT: + mach_port_guard_ast(t, code, subcode); + break; + case GUARD_TYPE_FD: + fd_guard_ast(t, code, subcode); + break; +#if CONFIG_VNGUARD + case GUARD_TYPE_VN: + vn_guard_ast(t, code, subcode); + break; +#endif + default: + panic("guard_exc_info %llx %llx", code, subcode); + } +} + +static void +thread_cputime_callback(int warning, __unused const void *arg0, __unused const void *arg1) +{ + if (warning == LEDGER_WARNING_ROSE_ABOVE) { +#if CONFIG_TELEMETRY + /* + * This thread is in danger of violating the CPU usage monitor. Enable telemetry + * on the entire task so there are micro-stackshots available if and when + * EXC_RESOURCE is triggered. We could have chosen to enable micro-stackshots + * for this thread only; but now that this task is suspect, knowing what all of + * its threads are up to will be useful. + */ + telemetry_task_ctl(current_task(), TF_CPUMON_WARNING, 1); +#endif + return; + } + +#if CONFIG_TELEMETRY + /* + * If the balance has dipped below the warning level (LEDGER_WARNING_DIPPED_BELOW) or + * exceeded the limit, turn telemetry off for the task. + */ + telemetry_task_ctl(current_task(), TF_CPUMON_WARNING, 0); +#endif + + if (warning == 0) { + SENDING_NOTIFICATION__THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU(); + } +} + +void __attribute__((noinline)) +SENDING_NOTIFICATION__THIS_THREAD_IS_CONSUMING_TOO_MUCH_CPU(void) +{ + int pid = 0; + task_t task = current_task(); + thread_t thread = current_thread(); + uint64_t tid = thread->thread_id; + const char *procname = "unknown"; + time_value_t thread_total_time = {0, 0}; + time_value_t thread_system_time; + time_value_t thread_user_time; + int action; + uint8_t percentage; + uint32_t usage_percent = 0; + uint32_t interval_sec; + uint64_t interval_ns; + uint64_t balance_ns; + boolean_t fatal = FALSE; + boolean_t send_exc_resource = TRUE; /* in addition to RESOURCE_NOTIFY */ + kern_return_t kr; + +#ifdef EXC_RESOURCE_MONITORS + mach_exception_data_type_t code[EXCEPTION_CODE_MAX]; +#endif /* EXC_RESOURCE_MONITORS */ + struct ledger_entry_info lei; + + assert(thread->t_threadledger != LEDGER_NULL); + + /* + * Extract the fatal bit and suspend the monitor (which clears the bit). + */ + task_lock(task); + if (task->rusage_cpu_flags & TASK_RUSECPU_FLAGS_FATAL_CPUMON) { + fatal = TRUE; + send_exc_resource = TRUE; + } + /* Only one thread can be here at a time. Whichever makes it through + first will successfully suspend the monitor and proceed to send the + notification. Other threads will get an error trying to suspend the + monitor and give up on sending the notification. In the first release, + the monitor won't be resumed for a number of seconds, but we may + eventually need to handle low-latency resume. + */ + kr = task_suspend_cpumon(task); + task_unlock(task); + if (kr == KERN_INVALID_ARGUMENT) return; + +#ifdef MACH_BSD + pid = proc_selfpid(); + if (task->bsd_info != NULL) { + procname = proc_name_address(task->bsd_info); + } +#endif + + thread_get_cpulimit(&action, &percentage, &interval_ns); + + interval_sec = (uint32_t)(interval_ns / NSEC_PER_SEC); + + thread_read_times(thread, &thread_user_time, &thread_system_time); + time_value_add(&thread_total_time, &thread_user_time); + time_value_add(&thread_total_time, &thread_system_time); + ledger_get_entry_info(thread->t_threadledger, thread_ledgers.cpu_time, &lei); + + /* credit/debit/balance/limit are in absolute time units; + the refill info is in nanoseconds. */ + absolutetime_to_nanoseconds(lei.lei_balance, &balance_ns); + if (lei.lei_last_refill > 0) { + usage_percent = (uint32_t)((balance_ns*100ULL) / lei.lei_last_refill); + } + + /* TODO: show task total runtime (via TASK_ABSOLUTETIME_INFO)? */ + printf("process %s[%d] thread %llu caught burning CPU! " + "It used more than %d%% CPU over %u seconds " + "(actual recent usage: %d%% over ~%llu seconds). " + "Thread lifetime cpu usage %d.%06ds, (%d.%06d user, %d.%06d sys) " + "ledger balance: %lld mabs credit: %lld mabs debit: %lld mabs " + "limit: %llu mabs period: %llu ns last refill: %llu ns%s.\n", + procname, pid, tid, + percentage, interval_sec, + usage_percent, + (lei.lei_last_refill + NSEC_PER_SEC/2) / NSEC_PER_SEC, + thread_total_time.seconds, thread_total_time.microseconds, + thread_user_time.seconds, thread_user_time.microseconds, + thread_system_time.seconds,thread_system_time.microseconds, + lei.lei_balance, lei.lei_credit, lei.lei_debit, + lei.lei_limit, lei.lei_refill_period, lei.lei_last_refill, + (fatal ? " [fatal violation]" : "")); + + /* + For now, send RESOURCE_NOTIFY in parallel with EXC_RESOURCE. Once + we have logging parity, we will stop sending EXC_RESOURCE (24508922). + */ + + /* RESOURCE_NOTIFY MIG specifies nanoseconds of CPU time */ + lei.lei_balance = balance_ns; + absolutetime_to_nanoseconds(lei.lei_limit, &lei.lei_limit); + trace_resource_violation(RMON_CPUUSAGE_VIOLATED, &lei); + kr = send_resource_violation(send_cpu_usage_violation, task, &lei, + fatal ? kRNFatalLimitFlag : 0); + if (kr) { + printf("send_resource_violation(CPU usage, ...): error %#x\n", kr); + } + +#ifdef EXC_RESOURCE_MONITORS + if (send_exc_resource) { + if (disable_exc_resource) { + printf("process %s[%d] thread %llu caught burning CPU! " + "EXC_RESOURCE%s supressed by a boot-arg\n", + procname, pid, tid, fatal ? " (and termination)" : ""); + return; + } + + if (audio_active) { + printf("process %s[%d] thread %llu caught burning CPU! " + "EXC_RESOURCE & termination supressed due to audio playback\n", + procname, pid, tid); + return; + } + } + + + if (send_exc_resource) { + code[0] = code[1] = 0; + EXC_RESOURCE_ENCODE_TYPE(code[0], RESOURCE_TYPE_CPU); + if (fatal) { + EXC_RESOURCE_ENCODE_FLAVOR(code[0], FLAVOR_CPU_MONITOR_FATAL); + }else { + EXC_RESOURCE_ENCODE_FLAVOR(code[0], FLAVOR_CPU_MONITOR); + } + EXC_RESOURCE_CPUMONITOR_ENCODE_INTERVAL(code[0], interval_sec); + EXC_RESOURCE_CPUMONITOR_ENCODE_PERCENTAGE(code[0], percentage); + EXC_RESOURCE_CPUMONITOR_ENCODE_PERCENTAGE(code[1], usage_percent); + exception_triage(EXC_RESOURCE, code, EXCEPTION_CODE_MAX); + } +#endif /* EXC_RESOURCE_MONITORS */ + + if (fatal) { +#if CONFIG_JETSAM + jetsam_on_ledger_cpulimit_exceeded(); +#else + task_terminate_internal(task); +#endif + } +} + +void thread_update_io_stats(thread_t thread, int size, int io_flags) +{ + int io_tier; + + if (thread->thread_io_stats == NULL || thread->task->task_io_stats == NULL) + return; + + if (io_flags & DKIO_READ) { + UPDATE_IO_STATS(thread->thread_io_stats->disk_reads, size); + UPDATE_IO_STATS_ATOMIC(thread->task->task_io_stats->disk_reads, size); + } + + if (io_flags & DKIO_META) { + UPDATE_IO_STATS(thread->thread_io_stats->metadata, size); + UPDATE_IO_STATS_ATOMIC(thread->task->task_io_stats->metadata, size); + } + + if (io_flags & DKIO_PAGING) { + UPDATE_IO_STATS(thread->thread_io_stats->paging, size); + UPDATE_IO_STATS_ATOMIC(thread->task->task_io_stats->paging, size); + } + + io_tier = ((io_flags & DKIO_TIER_MASK) >> DKIO_TIER_SHIFT); + assert (io_tier < IO_NUM_PRIORITIES); + + UPDATE_IO_STATS(thread->thread_io_stats->io_priority[io_tier], size); + UPDATE_IO_STATS_ATOMIC(thread->task->task_io_stats->io_priority[io_tier], size); + + /* Update Total I/O Counts */ + UPDATE_IO_STATS(thread->thread_io_stats->total_io, size); + UPDATE_IO_STATS_ATOMIC(thread->task->task_io_stats->total_io, size); + + if (!(io_flags & DKIO_READ)) { + DTRACE_IO3(physical_writes, struct task *, thread->task, uint32_t, size, int, io_flags); + ledger_credit(thread->task->ledger, task_ledgers.physical_writes, size); + } +} + +static void +init_thread_ledgers(void) { + ledger_template_t t; + int idx; + + assert(thread_ledger_template == NULL); + + if ((t = ledger_template_create("Per-thread ledger")) == NULL) + panic("couldn't create thread ledger template"); + + if ((idx = ledger_entry_add(t, "cpu_time", "sched", "ns")) < 0) { + panic("couldn't create cpu_time entry for thread ledger template"); + } + + if (ledger_set_callback(t, idx, thread_cputime_callback, NULL, NULL) < 0) { + panic("couldn't set thread ledger callback for cpu_time entry"); + } + + thread_ledgers.cpu_time = idx; + + ledger_template_complete(t); + thread_ledger_template = t; +} + +/* + * Returns currently applied CPU usage limit, or 0/0 if none is applied. + */ +int +thread_get_cpulimit(int *action, uint8_t *percentage, uint64_t *interval_ns) +{ + int64_t abstime = 0; + uint64_t limittime = 0; + thread_t thread = current_thread(); + + *percentage = 0; + *interval_ns = 0; + *action = 0; + + if (thread->t_threadledger == LEDGER_NULL) { + /* + * This thread has no per-thread ledger, so it can't possibly + * have a CPU limit applied. + */ + return (KERN_SUCCESS); + } + + ledger_get_period(thread->t_threadledger, thread_ledgers.cpu_time, interval_ns); + ledger_get_limit(thread->t_threadledger, thread_ledgers.cpu_time, &abstime); + + if ((abstime == LEDGER_LIMIT_INFINITY) || (*interval_ns == 0)) { + /* + * This thread's CPU time ledger has no period or limit; so it + * doesn't have a CPU limit applied. + */ + return (KERN_SUCCESS); + } + + /* + * This calculation is the converse to the one in thread_set_cpulimit(). + */ + absolutetime_to_nanoseconds(abstime, &limittime); + *percentage = (limittime * 100ULL) / *interval_ns; + assert(*percentage <= 100); + + if (thread->options & TH_OPT_PROC_CPULIMIT) { + assert((thread->options & TH_OPT_PRVT_CPULIMIT) == 0); + + *action = THREAD_CPULIMIT_BLOCK; + } else if (thread->options & TH_OPT_PRVT_CPULIMIT) { + assert((thread->options & TH_OPT_PROC_CPULIMIT) == 0); + + *action = THREAD_CPULIMIT_EXCEPTION; } else { - /* if we are trying to acquire funnel recursively - * check for funnel to be held already + *action = THREAD_CPULIMIT_DISABLE; + } + + return (KERN_SUCCESS); +} + +/* + * Set CPU usage limit on a thread. + * + * Calling with percentage of 0 will unset the limit for this thread. + */ +int +thread_set_cpulimit(int action, uint8_t percentage, uint64_t interval_ns) +{ + thread_t thread = current_thread(); + ledger_t l; + uint64_t limittime = 0; + uint64_t abstime = 0; + + assert(percentage <= 100); + + if (action == THREAD_CPULIMIT_DISABLE) { + /* + * Remove CPU limit, if any exists. */ - if (funneled && (fnl->fnl_mutex != cur_thread->funnel_lock->fnl_mutex)) { - panic("thread_funnel_set: already holding a different funnel"); + if (thread->t_threadledger != LEDGER_NULL) { + l = thread->t_threadledger; + ledger_set_limit(l, thread_ledgers.cpu_time, LEDGER_LIMIT_INFINITY, 0); + ledger_set_action(l, thread_ledgers.cpu_time, LEDGER_ACTION_IGNORE); + thread->options &= ~(TH_OPT_PROC_CPULIMIT | TH_OPT_PRVT_CPULIMIT); } + + return (0); + } + + if (interval_ns < MINIMUM_CPULIMIT_INTERVAL_MS * NSEC_PER_MSEC) { + return (KERN_INVALID_ARGUMENT); + } + + l = thread->t_threadledger; + if (l == LEDGER_NULL) { + /* + * This thread doesn't yet have a per-thread ledger; so create one with the CPU time entry active. + */ + if ((l = ledger_instantiate(thread_ledger_template, LEDGER_CREATE_INACTIVE_ENTRIES)) == LEDGER_NULL) + return (KERN_RESOURCE_SHORTAGE); + + /* + * We are the first to create this thread's ledger, so only activate our entry. + */ + ledger_entry_setactive(l, thread_ledgers.cpu_time); + thread->t_threadledger = l; } - return(funnel_state_prev); + + /* + * The limit is specified as a percentage of CPU over an interval in nanoseconds. + * Calculate the amount of CPU time that the thread needs to consume in order to hit the limit. + */ + limittime = (interval_ns * percentage) / 100; + nanoseconds_to_absolutetime(limittime, &abstime); + ledger_set_limit(l, thread_ledgers.cpu_time, abstime, cpumon_ustackshots_trigger_pct); + /* + * Refill the thread's allotted CPU time every interval_ns nanoseconds. + */ + ledger_set_period(l, thread_ledgers.cpu_time, interval_ns); + + if (action == THREAD_CPULIMIT_EXCEPTION) { + /* + * We don't support programming the CPU usage monitor on a task if any of its + * threads have a per-thread blocking CPU limit configured. + */ + if (thread->options & TH_OPT_PRVT_CPULIMIT) { + panic("CPU usage monitor activated, but blocking thread limit exists"); + } + + /* + * Make a note that this thread's CPU limit is being used for the task-wide CPU + * usage monitor. We don't have to arm the callback which will trigger the + * exception, because that was done for us in ledger_instantiate (because the + * ledger template used has a default callback). + */ + thread->options |= TH_OPT_PROC_CPULIMIT; + } else { + /* + * We deliberately override any CPU limit imposed by a task-wide limit (eg + * CPU usage monitor). + */ + thread->options &= ~TH_OPT_PROC_CPULIMIT; + + thread->options |= TH_OPT_PRVT_CPULIMIT; + /* The per-thread ledger template by default has a callback for CPU time */ + ledger_disable_callback(l, thread_ledgers.cpu_time); + ledger_set_action(l, thread_ledgers.cpu_time, LEDGER_ACTION_BLOCK); + } + + return (0); } static void @@ -1390,6 +2603,39 @@ thread_sched_call( thread->sched_call = (call != NULL)? call: sched_call_null; } +sched_call_t +thread_disable_sched_call( + thread_t thread, + sched_call_t call) +{ + if (call) { + spl_t s = splsched(); + thread_lock(thread); + if (thread->sched_call == call) { + thread->sched_call = sched_call_null; + } else { + call = NULL; + } + thread_unlock(thread); + splx(s); + } + return call; +} + +void +thread_reenable_sched_call( + thread_t thread, + sched_call_t call) +{ + if (call) { + spl_t s = splsched(); + thread_lock(thread); + thread_sched_call(thread, call); + thread_unlock(thread); + splx(s); + } +} + void thread_static_param( thread_t thread, @@ -1407,25 +2653,66 @@ thread_tid( return (thread != THREAD_NULL? thread->thread_id: 0); } +uint16_t thread_set_tag(thread_t th, uint16_t tag) { + return thread_set_tag_internal(th, tag); +} +uint16_t thread_get_tag(thread_t th) { + return thread_get_tag_internal(th); +} + uint64_t thread_dispatchqaddr( thread_t thread) { - uint64_t dispatchqueue_addr = 0; - uint64_t thread_handle = 0; + uint64_t dispatchqueue_addr; + uint64_t thread_handle; - if (thread != THREAD_NULL) { -#if defined(__ppc__) || defined(__arm__) - thread_handle = thread->machine.cthread_self; -#else - thread_handle = thread->machine.pcb->cthread_self; -#endif + if (thread == THREAD_NULL) + return 0; + + thread_handle = thread->machine.cthread_self; + if (thread_handle == 0) + return 0; + + if (thread->inspection == TRUE) + dispatchqueue_addr = thread_handle + get_task_dispatchqueue_offset(thread->task); + else if (thread->task->bsd_info) + dispatchqueue_addr = thread_handle + get_dispatchqueue_offset_from_proc(thread->task->bsd_info); + else + dispatchqueue_addr = 0; + + return dispatchqueue_addr; +} + +uint64_t +thread_rettokern_addr( + thread_t thread) +{ + uint64_t rettokern_addr; + uint64_t rettokern_offset; + uint64_t thread_handle; + + if (thread == THREAD_NULL) + return 0; - if (thread->task->bsd_info) - dispatchqueue_addr = thread_handle + get_dispatchqueue_offset_from_proc(thread->task->bsd_info); + thread_handle = thread->machine.cthread_self; + if (thread_handle == 0) + return 0; + + if (thread->task->bsd_info) { + rettokern_offset = get_return_to_kernel_offset_from_proc(thread->task->bsd_info); + + /* Return 0 if return to kernel offset is not initialized. */ + if (rettokern_offset == 0) { + rettokern_addr = 0; + } else { + rettokern_addr = thread_handle + rettokern_offset; + } + } else { + rettokern_addr = 0; } - return (dispatchqueue_addr); + return rettokern_addr; } /* @@ -1452,6 +2739,330 @@ thread_should_halt( return (thread_should_halt_fast(th)); } +/* + * thread_set_voucher_name - reset the voucher port name bound to this thread + * + * Conditions: nothing locked + * + * If we already converted the previous name to a cached voucher + * reference, then we discard that reference here. The next lookup + * will cache it again. + */ + +kern_return_t +thread_set_voucher_name(mach_port_name_t voucher_name) +{ + thread_t thread = current_thread(); + ipc_voucher_t new_voucher = IPC_VOUCHER_NULL; + ipc_voucher_t voucher; + ledger_t bankledger = NULL; + thread_group_t banktg = NULL; + + if (MACH_PORT_DEAD == voucher_name) + return KERN_INVALID_RIGHT; + + /* + * agressively convert to voucher reference + */ + if (MACH_PORT_VALID(voucher_name)) { + new_voucher = convert_port_name_to_voucher(voucher_name); + if (IPC_VOUCHER_NULL == new_voucher) + return KERN_INVALID_ARGUMENT; + } + bank_get_bank_ledger_and_thread_group(new_voucher, &bankledger, &banktg); + + thread_mtx_lock(thread); + voucher = thread->ith_voucher; + thread->ith_voucher_name = voucher_name; + thread->ith_voucher = new_voucher; + thread_mtx_unlock(thread); + + bank_swap_thread_bank_ledger(thread, bankledger); + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_IPC,MACH_THREAD_SET_VOUCHER) | DBG_FUNC_NONE, + (uintptr_t)thread_tid(thread), + (uintptr_t)voucher_name, + VM_KERNEL_ADDRPERM((uintptr_t)new_voucher), + 1, 0); + + if (IPC_VOUCHER_NULL != voucher) + ipc_voucher_release(voucher); + + return KERN_SUCCESS; +} + +/* + * thread_get_mach_voucher - return a voucher reference for the specified thread voucher + * + * Conditions: nothing locked + * + * A reference to the voucher may be lazily pending, if someone set the voucher name + * but nobody has done a lookup yet. In that case, we'll have to do the equivalent + * lookup here. + * + * NOTE: At the moment, there is no distinction between the current and effective + * vouchers because we only set them at the thread level currently. + */ +kern_return_t +thread_get_mach_voucher( + thread_act_t thread, + mach_voucher_selector_t __unused which, + ipc_voucher_t *voucherp) +{ + ipc_voucher_t voucher; + mach_port_name_t voucher_name; + + if (THREAD_NULL == thread) + return KERN_INVALID_ARGUMENT; + + thread_mtx_lock(thread); + voucher = thread->ith_voucher; + + /* if already cached, just return a ref */ + if (IPC_VOUCHER_NULL != voucher) { + ipc_voucher_reference(voucher); + thread_mtx_unlock(thread); + *voucherp = voucher; + return KERN_SUCCESS; + } + + voucher_name = thread->ith_voucher_name; + + /* convert the name to a port, then voucher reference */ + if (MACH_PORT_VALID(voucher_name)) { + ipc_port_t port; + + if (KERN_SUCCESS != + ipc_object_copyin(thread->task->itk_space, voucher_name, + MACH_MSG_TYPE_COPY_SEND, (ipc_object_t *)&port)) { + thread->ith_voucher_name = MACH_PORT_NULL; + thread_mtx_unlock(thread); + *voucherp = IPC_VOUCHER_NULL; + return KERN_SUCCESS; + } + + /* convert to a voucher ref to return, and cache a ref on thread */ + voucher = convert_port_to_voucher(port); + ipc_voucher_reference(voucher); + thread->ith_voucher = voucher; + thread_mtx_unlock(thread); + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_IPC,MACH_THREAD_SET_VOUCHER) | DBG_FUNC_NONE, + (uintptr_t)thread_tid(thread), + (uintptr_t)port, + VM_KERNEL_ADDRPERM((uintptr_t)voucher), + 2, 0); + + + ipc_port_release_send(port); + } else + thread_mtx_unlock(thread); + + *voucherp = voucher; + return KERN_SUCCESS; +} + +/* + * thread_set_mach_voucher - set a voucher reference for the specified thread voucher + * + * Conditions: callers holds a reference on the voucher. + * nothing locked. + * + * We grab another reference to the voucher and bind it to the thread. Any lazy + * binding is erased. The old voucher reference associated with the thread is + * discarded. + */ +kern_return_t +thread_set_mach_voucher( + thread_t thread, + ipc_voucher_t voucher) +{ + ipc_voucher_t old_voucher; + ledger_t bankledger = NULL; + thread_group_t banktg = NULL; + + if (THREAD_NULL == thread) + return KERN_INVALID_ARGUMENT; + + if (thread != current_thread() && thread->started) + return KERN_INVALID_ARGUMENT; + + ipc_voucher_reference(voucher); + bank_get_bank_ledger_and_thread_group(voucher, &bankledger, &banktg); + + thread_mtx_lock(thread); + old_voucher = thread->ith_voucher; + thread->ith_voucher = voucher; + thread->ith_voucher_name = MACH_PORT_NULL; + thread_mtx_unlock(thread); + + bank_swap_thread_bank_ledger(thread, bankledger); + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_IPC,MACH_THREAD_SET_VOUCHER) | DBG_FUNC_NONE, + (uintptr_t)thread_tid(thread), + (uintptr_t)MACH_PORT_NULL, + VM_KERNEL_ADDRPERM((uintptr_t)voucher), + 3, 0); + + ipc_voucher_release(old_voucher); + + return KERN_SUCCESS; +} + +/* + * thread_swap_mach_voucher - swap a voucher reference for the specified thread voucher + * + * Conditions: callers holds a reference on the new and presumed old voucher(s). + * nothing locked. + * + * If the old voucher is still the same as passed in, replace it with new voucher + * and discard the old (and the reference passed in). Otherwise, discard the new + * and return an updated old voucher. + */ +kern_return_t +thread_swap_mach_voucher( + thread_t thread, + ipc_voucher_t new_voucher, + ipc_voucher_t *in_out_old_voucher) +{ + mach_port_name_t old_voucher_name; + ipc_voucher_t old_voucher; + ledger_t bankledger = NULL; + thread_group_t banktg = NULL; + + if (THREAD_NULL == thread) + return KERN_INVALID_TASK; + + if (thread != current_thread() && thread->started) + return KERN_INVALID_ARGUMENT; + + bank_get_bank_ledger_and_thread_group(new_voucher, &bankledger, &banktg); + + thread_mtx_lock(thread); + + old_voucher = thread->ith_voucher; + + if (IPC_VOUCHER_NULL == old_voucher) { + old_voucher_name = thread->ith_voucher_name; + + /* perform lazy binding if needed */ + if (MACH_PORT_VALID(old_voucher_name)) { + old_voucher = convert_port_name_to_voucher(old_voucher_name); + thread->ith_voucher_name = MACH_PORT_NULL; + thread->ith_voucher = old_voucher; + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_IPC,MACH_THREAD_SET_VOUCHER) | DBG_FUNC_NONE, + (uintptr_t)thread_tid(thread), + (uintptr_t)old_voucher_name, + VM_KERNEL_ADDRPERM((uintptr_t)old_voucher), + 4, 0); + + } + } + + /* swap in new voucher, if old voucher matches the one supplied */ + if (old_voucher == *in_out_old_voucher) { + ipc_voucher_reference(new_voucher); + thread->ith_voucher = new_voucher; + thread->ith_voucher_name = MACH_PORT_NULL; + thread_mtx_unlock(thread); + bank_swap_thread_bank_ledger(thread, bankledger); + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + MACHDBG_CODE(DBG_MACH_IPC,MACH_THREAD_SET_VOUCHER) | DBG_FUNC_NONE, + (uintptr_t)thread_tid(thread), + (uintptr_t)MACH_PORT_NULL, + VM_KERNEL_ADDRPERM((uintptr_t)new_voucher), + 5, 0); + + ipc_voucher_release(old_voucher); + + *in_out_old_voucher = IPC_VOUCHER_NULL; + return KERN_SUCCESS; + } + + /* Otherwise, just return old voucher reference */ + ipc_voucher_reference(old_voucher); + thread_mtx_unlock(thread); + *in_out_old_voucher = old_voucher; + return KERN_SUCCESS; +} + +/* + * thread_get_current_voucher_origin_pid - get the pid of the originator of the current voucher. + */ +kern_return_t +thread_get_current_voucher_origin_pid( + int32_t *pid) +{ + uint32_t buf_size; + kern_return_t kr; + thread_t thread = current_thread(); + + buf_size = sizeof(*pid); + kr = mach_voucher_attr_command(thread->ith_voucher, + MACH_VOUCHER_ATTR_KEY_BANK, + BANK_ORIGINATOR_PID, + NULL, + 0, + (mach_voucher_attr_content_t)pid, + &buf_size); + + return kr; +} + + +boolean_t +thread_has_thread_name(thread_t th) +{ + if ((th) && (th->uthread)) { + return bsd_hasthreadname(th->uthread); + } + + /* + * This is an odd case; clients may set the thread name based on the lack of + * a name, but in this context there is no uthread to attach the name to. + */ + return FALSE; +} + +void +thread_set_thread_name(thread_t th, const char* name) +{ + if ((th) && (th->uthread) && name) { + bsd_setthreadname(th->uthread, name); + } +} + +/* + * thread_enable_send_importance - set/clear the SEND_IMPORTANCE thread option bit. + */ +void thread_enable_send_importance(thread_t thread, boolean_t enable) +{ + if (enable == TRUE) + thread->options |= TH_OPT_SEND_IMPORTANCE; + else + thread->options &= ~TH_OPT_SEND_IMPORTANCE; +} + +/* + * thread_set_allocation_name - . + */ + +kern_allocation_name_t thread_set_allocation_name(kern_allocation_name_t new_name) +{ + kern_allocation_name_t ret; + thread_kernel_state_t kstate = thread_get_kernel_state(current_thread()); + ret = kstate->allocation_name; + // fifo + if (!new_name || !kstate->allocation_name) kstate->allocation_name = new_name; + return ret; +} + #if CONFIG_DTRACE uint32_t dtrace_get_thread_predcache(thread_t thread) { @@ -1469,6 +3080,15 @@ int64_t dtrace_get_thread_vtime(thread_t thread) return 0; } +int dtrace_get_thread_last_cpu_id(thread_t thread) +{ + if ((thread != THREAD_NULL) && (thread->last_processor != PROCESSOR_NULL)) { + return thread->last_processor->cpu_id; + } else { + return -1; + } +} + int64_t dtrace_get_thread_tracing(thread_t thread) { if (thread != THREAD_NULL) @@ -1493,14 +3113,16 @@ vm_offset_t dtrace_get_kernel_stack(thread_t thread) return 0; } +#if KASAN +struct kasan_thread_data * +kasan_get_thread_data(thread_t thread) +{ + return &thread->kasan_data; +} +#endif + int64_t dtrace_calc_thread_recent_vtime(thread_t thread) { -#if STAT_TIME - if (thread != THREAD_NULL) { - return timer_grab(&(thread->system_timer)) + timer_grab(&(thread->user_timer)); - } else - return 0; -#else if (thread != THREAD_NULL) { processor_t processor = current_processor(); uint64_t abstime = mach_absolute_time(); @@ -1512,7 +3134,6 @@ int64_t dtrace_calc_thread_recent_vtime(thread_t thread) (abstime - timer->tstamp); /* XXX need interrupts off to prevent missed time? */ } else return 0; -#endif } void dtrace_set_thread_predcache(thread_t thread, uint32_t predcache) @@ -1557,10 +3178,24 @@ vm_offset_t dtrace_set_thread_recover(thread_t thread, vm_offset_t recover) void dtrace_thread_bootstrap(void) { task_t task = current_task(); - if(task->thread_count == 1) { + + if (task->thread_count == 1) { + thread_t thread = current_thread(); + if (thread->t_dtrace_flags & TH_DTRACE_EXECSUCCESS) { + thread->t_dtrace_flags &= ~TH_DTRACE_EXECSUCCESS; + DTRACE_PROC(exec__success); + KDBG(BSDDBG_CODE(DBG_BSD_PROC,BSD_PROC_EXEC), + task_pid(task)); + } DTRACE_PROC(start); } DTRACE_PROC(lwp__start); } + +void +dtrace_thread_didexec(thread_t thread) +{ + thread->t_dtrace_flags |= TH_DTRACE_EXECSUCCESS; +} #endif /* CONFIG_DTRACE */