/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(__xpv) #include #endif #if defined(__xpv) && defined(DEBUG) /* * This panic message is intended as an aid to interrupt debugging. * * The associated assertion tests the condition of enabling * events when events are already enabled. The implication * being that whatever code the programmer thought was * protected by having events disabled until the second * enable happened really wasn't protected at all .. */ int stistipanic = 1; /* controls the debug panic check */ const char *stistimsg = "stisti"; ulong_t laststi[NCPU]; /* * This variable tracks the last place events were disabled on each cpu * it assists in debugging when asserts that interupts are enabled trip. */ ulong_t lastcli[NCPU]; #endif /* * Set cpu's base SPL level to the highest active interrupt level */ void set_base_spl(void) { struct cpu *cpu = CPU; uint16_t active = (uint16_t)cpu->cpu_intr_actv; cpu->cpu_base_spl = active == 0 ? 0 : bsrw_insn(active); } /* * Do all the work necessary to set up the cpu and thread structures * to dispatch a high-level interrupt. * * Returns 0 if we're -not- already on the high-level interrupt stack, * (and *must* switch to it), non-zero if we are already on that stack. * * Called with interrupts masked. * The 'pil' is already set to the appropriate level for rp->r_trapno. */ static int hilevel_intr_prolog(struct cpu *cpu, uint_t pil, uint_t oldpil, struct regs *rp) { struct machcpu *mcpu = &cpu->cpu_m; uint_t mask; hrtime_t intrtime; hrtime_t now = tsc_read(); ASSERT(pil > LOCK_LEVEL); if (pil == CBE_HIGH_PIL) { cpu->cpu_profile_pil = oldpil; if (USERMODE(rp->r_cs)) { cpu->cpu_profile_pc = 0; cpu->cpu_profile_upc = rp->r_pc; } else { cpu->cpu_profile_pc = rp->r_pc; cpu->cpu_profile_upc = 0; } } mask = cpu->cpu_intr_actv & CPU_INTR_ACTV_HIGH_LEVEL_MASK; if (mask != 0) { int nestpil; /* * We have interrupted another high-level interrupt. * Load starting timestamp, compute interval, update * cumulative counter. */ nestpil = bsrw_insn((uint16_t)mask); ASSERT(nestpil < pil); intrtime = now - mcpu->pil_high_start[nestpil - (LOCK_LEVEL + 1)]; mcpu->intrstat[nestpil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; /* * Another high-level interrupt is active below this one, so * there is no need to check for an interrupt thread. That * will be done by the lowest priority high-level interrupt * active. */ } else { kthread_t *t = cpu->cpu_thread; /* * See if we are interrupting a low-level interrupt thread. * If so, account for its time slice only if its time stamp * is non-zero. */ if ((t->t_flag & T_INTR_THREAD) != 0 && t->t_intr_start != 0) { intrtime = now - t->t_intr_start; mcpu->intrstat[t->t_pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; t->t_intr_start = 0; } } /* * Store starting timestamp in CPU structure for this PIL. */ mcpu->pil_high_start[pil - (LOCK_LEVEL + 1)] = now; ASSERT((cpu->cpu_intr_actv & (1 << pil)) == 0); if (pil == 15) { /* * To support reentrant level 15 interrupts, we maintain a * recursion count in the top half of cpu_intr_actv. Only * when this count hits zero do we clear the PIL 15 bit from * the lower half of cpu_intr_actv. */ uint16_t *refcntp = (uint16_t *)&cpu->cpu_intr_actv + 1; (*refcntp)++; } mask = cpu->cpu_intr_actv; cpu->cpu_intr_actv |= (1 << pil); return (mask & CPU_INTR_ACTV_HIGH_LEVEL_MASK); } /* * Does most of the work of returning from a high level interrupt. * * Returns 0 if there are no more high level interrupts (in which * case we must switch back to the interrupted thread stack) or * non-zero if there are more (in which case we should stay on it). * * Called with interrupts masked */ static int hilevel_intr_epilog(struct cpu *cpu, uint_t pil, uint_t oldpil, uint_t vecnum) { struct machcpu *mcpu = &cpu->cpu_m; uint_t mask; hrtime_t intrtime; hrtime_t now = tsc_read(); ASSERT(mcpu->mcpu_pri == pil); cpu->cpu_stats.sys.intr[pil - 1]++; ASSERT(cpu->cpu_intr_actv & (1 << pil)); if (pil == 15) { /* * To support reentrant level 15 interrupts, we maintain a * recursion count in the top half of cpu_intr_actv. Only * when this count hits zero do we clear the PIL 15 bit from * the lower half of cpu_intr_actv. */ uint16_t *refcntp = (uint16_t *)&cpu->cpu_intr_actv + 1; ASSERT(*refcntp > 0); if (--(*refcntp) == 0) cpu->cpu_intr_actv &= ~(1 << pil); } else { cpu->cpu_intr_actv &= ~(1 << pil); } ASSERT(mcpu->pil_high_start[pil - (LOCK_LEVEL + 1)] != 0); intrtime = now - mcpu->pil_high_start[pil - (LOCK_LEVEL + 1)]; mcpu->intrstat[pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; /* * Check for lower-pil nested high-level interrupt beneath * current one. If so, place a starting timestamp in its * pil_high_start entry. */ mask = cpu->cpu_intr_actv & CPU_INTR_ACTV_HIGH_LEVEL_MASK; if (mask != 0) { int nestpil; /* * find PIL of nested interrupt */ nestpil = bsrw_insn((uint16_t)mask); ASSERT(nestpil < pil); mcpu->pil_high_start[nestpil - (LOCK_LEVEL + 1)] = now; /* * (Another high-level interrupt is active below this one, * so there is no need to check for an interrupt * thread. That will be done by the lowest priority * high-level interrupt active.) */ } else { /* * Check to see if there is a low-level interrupt active. * If so, place a starting timestamp in the thread * structure. */ kthread_t *t = cpu->cpu_thread; if (t->t_flag & T_INTR_THREAD) t->t_intr_start = now; } mcpu->mcpu_pri = oldpil; (void) (*setlvlx)(oldpil, vecnum); return (cpu->cpu_intr_actv & CPU_INTR_ACTV_HIGH_LEVEL_MASK); } /* * Set up the cpu, thread and interrupt thread structures for * executing an interrupt thread. The new stack pointer of the * interrupt thread (which *must* be switched to) is returned. */ static caddr_t intr_thread_prolog(struct cpu *cpu, caddr_t stackptr, uint_t pil) { struct machcpu *mcpu = &cpu->cpu_m; kthread_t *t, *volatile it; hrtime_t now = tsc_read(); ASSERT(pil > 0); ASSERT((cpu->cpu_intr_actv & (1 << pil)) == 0); cpu->cpu_intr_actv |= (1 << pil); /* * Get set to run an interrupt thread. * There should always be an interrupt thread, since we * allocate one for each level on each CPU. * * t_intr_start could be zero due to cpu_intr_swtch_enter. */ t = cpu->cpu_thread; if ((t->t_flag & T_INTR_THREAD) && t->t_intr_start != 0) { hrtime_t intrtime = now - t->t_intr_start; mcpu->intrstat[t->t_pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; t->t_intr_start = 0; } ASSERT(SA((uintptr_t)stackptr) == (uintptr_t)stackptr); t->t_sp = (uintptr_t)stackptr; /* mark stack in curthread for resume */ /* * unlink the interrupt thread off the cpu * * Note that the code in kcpc_overflow_intr -relies- on the * ordering of events here - in particular that t->t_lwp of * the interrupt thread is set to the pinned thread *before* * curthread is changed. */ it = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it->t_link; it->t_intr = t; it->t_lwp = t->t_lwp; /* * (threads on the interrupt thread free list could have state * preset to TS_ONPROC, but it helps in debugging if * they're TS_FREE.) */ it->t_state = TS_ONPROC; cpu->cpu_thread = it; /* new curthread on this cpu */ it->t_pil = (uchar_t)pil; it->t_pri = intr_pri + (pri_t)pil; it->t_intr_start = now; return (it->t_stk); } #ifdef DEBUG int intr_thread_cnt; #endif /* * Called with interrupts disabled */ static void intr_thread_epilog(struct cpu *cpu, uint_t vec, uint_t oldpil) { struct machcpu *mcpu = &cpu->cpu_m; kthread_t *t; kthread_t *it = cpu->cpu_thread; /* curthread */ uint_t pil, basespl; hrtime_t intrtime; hrtime_t now = tsc_read(); pil = it->t_pil; cpu->cpu_stats.sys.intr[pil - 1]++; ASSERT(it->t_intr_start != 0); intrtime = now - it->t_intr_start; mcpu->intrstat[pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; ASSERT(cpu->cpu_intr_actv & (1 << pil)); cpu->cpu_intr_actv &= ~(1 << pil); /* * If there is still an interrupted thread underneath this one * then the interrupt was never blocked and the return is * fairly simple. Otherwise it isn't. */ if ((t = it->t_intr) == NULL) { /* * The interrupted thread is no longer pinned underneath * the interrupt thread. This means the interrupt must * have blocked, and the interrupted thread has been * unpinned, and has probably been running around the * system for a while. * * Since there is no longer a thread under this one, put * this interrupt thread back on the CPU's free list and * resume the idle thread which will dispatch the next * thread to run. */ #ifdef DEBUG intr_thread_cnt++; #endif cpu->cpu_stats.sys.intrblk++; /* * Set CPU's base SPL based on active interrupts bitmask */ set_base_spl(); basespl = cpu->cpu_base_spl; mcpu->mcpu_pri = basespl; (*setlvlx)(basespl, vec); (void) splhigh(); sti(); it->t_state = TS_FREE; /* * Return interrupt thread to pool */ it->t_link = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it; swtch(); panic("intr_thread_epilog: swtch returned"); /*NOTREACHED*/ } /* * Return interrupt thread to the pool */ it->t_link = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it; it->t_state = TS_FREE; basespl = cpu->cpu_base_spl; pil = MAX(oldpil, basespl); mcpu->mcpu_pri = pil; (*setlvlx)(pil, vec); t->t_intr_start = now; cpu->cpu_thread = t; } /* * intr_get_time() is a resource for interrupt handlers to determine how * much time has been spent handling the current interrupt. Such a function * is needed because higher level interrupts can arrive during the * processing of an interrupt. intr_get_time() only returns time spent in the * current interrupt handler. * * The caller must be calling from an interrupt handler running at a pil * below or at lock level. Timings are not provided for high-level * interrupts. * * The first time intr_get_time() is called while handling an interrupt, * it returns the time since the interrupt handler was invoked. Subsequent * calls will return the time since the prior call to intr_get_time(). Time * is returned as ticks. Use scalehrtimef() to convert ticks to nsec. * * Theory Of Intrstat[][]: * * uint64_t intrstat[pil][0..1] is an array indexed by pil level, with two * uint64_ts per pil. * * intrstat[pil][0] is a cumulative count of the number of ticks spent * handling all interrupts at the specified pil on this CPU. It is * exported via kstats to the user. * * intrstat[pil][1] is always a count of ticks less than or equal to the * value in [0]. The difference between [1] and [0] is the value returned * by a call to intr_get_time(). At the start of interrupt processing, * [0] and [1] will be equal (or nearly so). As the interrupt consumes * time, [0] will increase, but [1] will remain the same. A call to * intr_get_time() will return the difference, then update [1] to be the * same as [0]. Future calls will return the time since the last call. * Finally, when the interrupt completes, [1] is updated to the same as [0]. * * Implementation: * * intr_get_time() works much like a higher level interrupt arriving. It * "checkpoints" the timing information by incrementing intrstat[pil][0] * to include elapsed running time, and by setting t_intr_start to rdtsc. * It then sets the return value to intrstat[pil][0] - intrstat[pil][1], * and updates intrstat[pil][1] to be the same as the new value of * intrstat[pil][0]. * * In the normal handling of interrupts, after an interrupt handler returns * and the code in intr_thread() updates intrstat[pil][0], it then sets * intrstat[pil][1] to the new value of intrstat[pil][0]. When [0] == [1], * the timings are reset, i.e. intr_get_time() will return [0] - [1] which * is 0. * * Whenever interrupts arrive on a CPU which is handling a lower pil * interrupt, they update the lower pil's [0] to show time spent in the * handler that they've interrupted. This results in a growing discrepancy * between [0] and [1], which is returned the next time intr_get_time() is * called. Time spent in the higher-pil interrupt will not be returned in * the next intr_get_time() call from the original interrupt, because * the higher-pil interrupt's time is accumulated in intrstat[higherpil][]. */ uint64_t intr_get_time(void) { struct cpu *cpu; struct machcpu *mcpu; kthread_t *t; uint64_t time, delta, ret; uint_t pil; cli(); cpu = CPU; mcpu = &cpu->cpu_m; t = cpu->cpu_thread; pil = t->t_pil; ASSERT((cpu->cpu_intr_actv & CPU_INTR_ACTV_HIGH_LEVEL_MASK) == 0); ASSERT(t->t_flag & T_INTR_THREAD); ASSERT(pil != 0); ASSERT(t->t_intr_start != 0); time = tsc_read(); delta = time - t->t_intr_start; t->t_intr_start = time; time = mcpu->intrstat[pil][0] + delta; ret = time - mcpu->intrstat[pil][1]; mcpu->intrstat[pil][0] = time; mcpu->intrstat[pil][1] = time; cpu->cpu_intracct[cpu->cpu_mstate] += delta; sti(); return (ret); } static caddr_t dosoftint_prolog( struct cpu *cpu, caddr_t stackptr, uint32_t st_pending, uint_t oldpil) { kthread_t *t, *volatile it; struct machcpu *mcpu = &cpu->cpu_m; uint_t pil; hrtime_t now; top: ASSERT(st_pending == mcpu->mcpu_softinfo.st_pending); pil = bsrw_insn((uint16_t)st_pending); if (pil <= oldpil || pil <= cpu->cpu_base_spl) return (0); /* * XX64 Sigh. * * This is a transliteration of the i386 assembler code for * soft interrupts. One question is "why does this need * to be atomic?" One possible race is -other- processors * posting soft interrupts to us in set_pending() i.e. the * CPU might get preempted just after the address computation, * but just before the atomic transaction, so another CPU would * actually set the original CPU's st_pending bit. However, * it looks like it would be simpler to disable preemption there. * Are there other races for which preemption control doesn't work? * * The i386 assembler version -also- checks to see if the bit * being cleared was actually set; if it wasn't, it rechecks * for more. This seems a bit strange, as the only code that * ever clears the bit is -this- code running with interrupts * disabled on -this- CPU. This code would probably be cheaper: * * atomic_and_32((uint32_t *)&mcpu->mcpu_softinfo.st_pending, * ~(1 << pil)); * * and t->t_preempt--/++ around set_pending() even cheaper, * but at this point, correctness is critical, so we slavishly * emulate the i386 port. */ if (atomic_btr32((uint32_t *) &mcpu->mcpu_softinfo.st_pending, pil) == 0) { st_pending = mcpu->mcpu_softinfo.st_pending; goto top; } mcpu->mcpu_pri = pil; (*setspl)(pil); now = tsc_read(); /* * Get set to run interrupt thread. * There should always be an interrupt thread since we * allocate one for each level on the CPU. */ it = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it->t_link; /* t_intr_start could be zero due to cpu_intr_swtch_enter. */ t = cpu->cpu_thread; if ((t->t_flag & T_INTR_THREAD) && t->t_intr_start != 0) { hrtime_t intrtime = now - t->t_intr_start; mcpu->intrstat[pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; t->t_intr_start = 0; } /* * Note that the code in kcpc_overflow_intr -relies- on the * ordering of events here - in particular that t->t_lwp of * the interrupt thread is set to the pinned thread *before* * curthread is changed. */ it->t_lwp = t->t_lwp; it->t_state = TS_ONPROC; /* * Push interrupted thread onto list from new thread. * Set the new thread as the current one. * Set interrupted thread's T_SP because if it is the idle thread, * resume() may use that stack between threads. */ ASSERT(SA((uintptr_t)stackptr) == (uintptr_t)stackptr); t->t_sp = (uintptr_t)stackptr; it->t_intr = t; cpu->cpu_thread = it; /* * Set bit for this pil in CPU's interrupt active bitmask. */ ASSERT((cpu->cpu_intr_actv & (1 << pil)) == 0); cpu->cpu_intr_actv |= (1 << pil); /* * Initialize thread priority level from intr_pri */ it->t_pil = (uchar_t)pil; it->t_pri = (pri_t)pil + intr_pri; it->t_intr_start = now; return (it->t_stk); } static void dosoftint_epilog(struct cpu *cpu, uint_t oldpil) { struct machcpu *mcpu = &cpu->cpu_m; kthread_t *t, *it; uint_t pil, basespl; hrtime_t intrtime; hrtime_t now = tsc_read(); it = cpu->cpu_thread; pil = it->t_pil; cpu->cpu_stats.sys.intr[pil - 1]++; ASSERT(cpu->cpu_intr_actv & (1 << pil)); cpu->cpu_intr_actv &= ~(1 << pil); intrtime = now - it->t_intr_start; mcpu->intrstat[pil][0] += intrtime; cpu->cpu_intracct[cpu->cpu_mstate] += intrtime; /* * If there is still an interrupted thread underneath this one * then the interrupt was never blocked and the return is * fairly simple. Otherwise it isn't. */ if ((t = it->t_intr) == NULL) { /* * Put thread back on the interrupt thread list. * This was an interrupt thread, so set CPU's base SPL. */ set_base_spl(); it->t_state = TS_FREE; it->t_link = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it; (void) splhigh(); sti(); swtch(); /*NOTREACHED*/ panic("dosoftint_epilog: swtch returned"); } it->t_link = cpu->cpu_intr_thread; cpu->cpu_intr_thread = it; it->t_state = TS_FREE; cpu->cpu_thread = t; if (t->t_flag & T_INTR_THREAD) t->t_intr_start = now; basespl = cpu->cpu_base_spl; pil = MAX(oldpil, basespl); mcpu->mcpu_pri = pil; (*setspl)(pil); } /* * Make the interrupted thread 'to' be runnable. * * Since t->t_sp has already been saved, t->t_pc is all * that needs to be set in this function. * * Returns the interrupt level of the interrupt thread. */ int intr_passivate( kthread_t *it, /* interrupt thread */ kthread_t *t) /* interrupted thread */ { extern void _sys_rtt(); ASSERT(it->t_flag & T_INTR_THREAD); ASSERT(SA(t->t_sp) == t->t_sp); t->t_pc = (uintptr_t)_sys_rtt; return (it->t_pil); } /* * Create interrupt kstats for this CPU. */ void cpu_create_intrstat(cpu_t *cp) { int i; kstat_t *intr_ksp; kstat_named_t *knp; char name[KSTAT_STRLEN]; zoneid_t zoneid; ASSERT(MUTEX_HELD(&cpu_lock)); if (pool_pset_enabled()) zoneid = GLOBAL_ZONEID; else zoneid = ALL_ZONES; intr_ksp = kstat_create_zone("cpu", cp->cpu_id, "intrstat", "misc", KSTAT_TYPE_NAMED, PIL_MAX * 2, NULL, zoneid); /* * Initialize each PIL's named kstat */ if (intr_ksp != NULL) { intr_ksp->ks_update = cpu_kstat_intrstat_update; knp = (kstat_named_t *)intr_ksp->ks_data; intr_ksp->ks_private = cp; for (i = 0; i < PIL_MAX; i++) { (void) snprintf(name, KSTAT_STRLEN, "level-%d-time", i + 1); kstat_named_init(&knp[i * 2], name, KSTAT_DATA_UINT64); (void) snprintf(name, KSTAT_STRLEN, "level-%d-count", i + 1); kstat_named_init(&knp[(i * 2) + 1], name, KSTAT_DATA_UINT64); } kstat_install(intr_ksp); } } /* * Delete interrupt kstats for this CPU. */ void cpu_delete_intrstat(cpu_t *cp) { kstat_delete_byname_zone("cpu", cp->cpu_id, "intrstat", ALL_ZONES); } /* * Convert interrupt statistics from CPU ticks to nanoseconds and * update kstat. */ int cpu_kstat_intrstat_update(kstat_t *ksp, int rw) { kstat_named_t *knp = ksp->ks_data; cpu_t *cpup = (cpu_t *)ksp->ks_private; int i; hrtime_t hrt; if (rw == KSTAT_WRITE) return (EACCES); for (i = 0; i < PIL_MAX; i++) { hrt = (hrtime_t)cpup->cpu_m.intrstat[i + 1][0]; scalehrtimef(&hrt); knp[i * 2].value.ui64 = (uint64_t)hrt; knp[(i * 2) + 1].value.ui64 = cpup->cpu_stats.sys.intr[i]; } return (0); } /* * An interrupt thread is ending a time slice, so compute the interval it * ran for and update the statistic for its PIL. */ void cpu_intr_swtch_enter(kthread_id_t t) { uint64_t interval; uint64_t start; cpu_t *cpu; ASSERT((t->t_flag & T_INTR_THREAD) != 0); ASSERT(t->t_pil > 0 && t->t_pil <= LOCK_LEVEL); /* * We could be here with a zero timestamp. This could happen if: * an interrupt thread which no longer has a pinned thread underneath * it (i.e. it blocked at some point in its past) has finished running * its handler. intr_thread() updated the interrupt statistic for its * PIL and zeroed its timestamp. Since there was no pinned thread to * return to, swtch() gets called and we end up here. * * Note that we use atomic ops below (cas64 and atomic_add_64), which * we don't use in the functions above, because we're not called * with interrupts blocked, but the epilog/prolog functions are. */ if (t->t_intr_start) { do { start = t->t_intr_start; interval = tsc_read() - start; } while (cas64(&t->t_intr_start, start, 0) != start); cpu = CPU; cpu->cpu_m.intrstat[t->t_pil][0] += interval; atomic_add_64((uint64_t *)&cpu->cpu_intracct[cpu->cpu_mstate], interval); } else ASSERT(t->t_intr == NULL); } /* * An interrupt thread is returning from swtch(). Place a starting timestamp * in its thread structure. */ void cpu_intr_swtch_exit(kthread_id_t t) { uint64_t ts; ASSERT((t->t_flag & T_INTR_THREAD) != 0); ASSERT(t->t_pil > 0 && t->t_pil <= LOCK_LEVEL); do { ts = t->t_intr_start; } while (cas64(&t->t_intr_start, ts, tsc_read()) != ts); } /* * Dispatch a hilevel interrupt (one above LOCK_LEVEL) */ /*ARGSUSED*/ static void dispatch_hilevel(uint_t vector, uint_t arg2) { sti(); av_dispatch_autovect(vector); cli(); } /* * Dispatch a soft interrupt */ /*ARGSUSED*/ static void dispatch_softint(uint_t oldpil, uint_t arg2) { struct cpu *cpu = CPU; sti(); av_dispatch_softvect((int)cpu->cpu_thread->t_pil); cli(); /* * Must run softint_epilog() on the interrupt thread stack, since * there may not be a return from it if the interrupt thread blocked. */ dosoftint_epilog(cpu, oldpil); } /* * Dispatch a normal interrupt */ static void dispatch_hardint(uint_t vector, uint_t oldipl) { struct cpu *cpu = CPU; sti(); av_dispatch_autovect(vector); cli(); /* * Must run intr_thread_epilog() on the interrupt thread stack, since * there may not be a return from it if the interrupt thread blocked. */ intr_thread_epilog(cpu, vector, oldipl); } /* * Deliver any softints the current interrupt priority allows. * Called with interrupts disabled. */ void dosoftint(struct regs *regs) { struct cpu *cpu = CPU; int oldipl; caddr_t newsp; while (cpu->cpu_softinfo.st_pending) { oldipl = cpu->cpu_pri; newsp = dosoftint_prolog(cpu, (caddr_t)regs, cpu->cpu_softinfo.st_pending, oldipl); /* * If returned stack pointer is NULL, priority is too high * to run any of the pending softints now. * Break out and they will be run later. */ if (newsp == NULL) break; switch_sp_and_call(newsp, dispatch_softint, oldipl, 0); } } /* * Interrupt service routine, called with interrupts disabled. */ /*ARGSUSED*/ void do_interrupt(struct regs *rp, trap_trace_rec_t *ttp) { struct cpu *cpu = CPU; int newipl, oldipl = cpu->cpu_pri; uint_t vector; caddr_t newsp; #ifdef TRAPTRACE ttp->ttr_marker = TT_INTERRUPT; ttp->ttr_ipl = 0xff; ttp->ttr_pri = oldipl; ttp->ttr_spl = cpu->cpu_base_spl; ttp->ttr_vector = 0xff; #endif /* TRAPTRACE */ #if !defined(__xpv) /* * Handle any pending TLB flushing */ tlb_service(); #endif /* * If it's a softint go do it now. */ if (rp->r_trapno == T_SOFTINT) { dosoftint(rp); ASSERT(!interrupts_enabled()); return; } /* * Raise the interrupt priority. */ newipl = (*setlvl)(oldipl, (int *)&rp->r_trapno); #ifdef TRAPTRACE ttp->ttr_ipl = newipl; #endif /* TRAPTRACE */ /* * Bail if it is a spurious interrupt */ if (newipl == -1) return; cpu->cpu_pri = newipl; vector = rp->r_trapno; #ifdef TRAPTRACE ttp->ttr_vector = vector; #endif /* TRAPTRACE */ if (newipl > LOCK_LEVEL) { /* * High priority interrupts run on this cpu's interrupt stack. */ if (hilevel_intr_prolog(cpu, newipl, oldipl, rp) == 0) { newsp = cpu->cpu_intr_stack; switch_sp_and_call(newsp, dispatch_hilevel, vector, 0); } else { /* already on the interrupt stack */ dispatch_hilevel(vector, 0); } (void) hilevel_intr_epilog(cpu, newipl, oldipl, vector); } else { /* * Run this interrupt in a separate thread. */ newsp = intr_thread_prolog(cpu, (caddr_t)rp, newipl); switch_sp_and_call(newsp, dispatch_hardint, vector, oldipl); } /* * Deliver any pending soft interrupts. */ if (cpu->cpu_softinfo.st_pending) dosoftint(rp); } /* * Common tasks always done by _sys_rtt, called with interrupts disabled. * Returns 1 if returning to userland, 0 if returning to system mode. */ int sys_rtt_common(struct regs *rp) { kthread_t *tp; extern void mutex_exit_critical_start(); extern long mutex_exit_critical_size; extern void mutex_owner_running_critical_start(); extern long mutex_owner_running_critical_size; loop: /* * Check if returning to user */ tp = CPU->cpu_thread; if (USERMODE(rp->r_cs)) { /* * Check if AST pending. */ if (tp->t_astflag) { /* * Let trap() handle the AST */ sti(); rp->r_trapno = T_AST; trap(rp, (caddr_t)0, CPU->cpu_id); cli(); goto loop; } #if defined(__amd64) /* * We are done if segment registers do not need updating. */ if (tp->t_lwp->lwp_pcb.pcb_rupdate == 0) return (1); if (update_sregs(rp, tp->t_lwp)) { /* * 1 or more of the selectors is bad. * Deliver a SIGSEGV. */ proc_t *p = ttoproc(tp); sti(); mutex_enter(&p->p_lock); tp->t_lwp->lwp_cursig = SIGSEGV; mutex_exit(&p->p_lock); psig(); tp->t_sig_check = 1; cli(); } tp->t_lwp->lwp_pcb.pcb_rupdate = 0; #endif /* __amd64 */ return (1); } /* * Here if we are returning to supervisor mode. * Check for a kernel preemption request. */ if (CPU->cpu_kprunrun && (rp->r_ps & PS_IE)) { /* * Do nothing if already in kpreempt */ if (!tp->t_preempt_lk) { tp->t_preempt_lk = 1; sti(); kpreempt(1); /* asynchronous kpreempt call */ cli(); tp->t_preempt_lk = 0; } } /* * If we interrupted the mutex_exit() critical region we must * reset the PC back to the beginning to prevent missed wakeups * See the comments in mutex_exit() for details. */ if ((uintptr_t)rp->r_pc - (uintptr_t)mutex_exit_critical_start < mutex_exit_critical_size) { rp->r_pc = (greg_t)mutex_exit_critical_start; } /* * If we interrupted the mutex_owner_running() critical region we * must reset the PC back to the beginning to prevent dereferencing * of a freed thread pointer. See the comments in mutex_owner_running * for details. */ if ((uintptr_t)rp->r_pc - (uintptr_t)mutex_owner_running_critical_start < mutex_owner_running_critical_size) { rp->r_pc = (greg_t)mutex_owner_running_critical_start; } return (0); } void send_dirint(int cpuid, int int_level) { (*send_dirintf)(cpuid, int_level); } /* * do_splx routine, takes new ipl to set * returns the old ipl. * We are careful not to set priority lower than CPU->cpu_base_pri, * even though it seems we're raising the priority, it could be set * higher at any time by an interrupt routine, so we must block interrupts * and look at CPU->cpu_base_pri */ int do_splx(int newpri) { ulong_t flag; cpu_t *cpu; int curpri, basepri; flag = intr_clear(); cpu = CPU; /* ints are disabled, now safe to cache cpu ptr */ curpri = cpu->cpu_m.mcpu_pri; basepri = cpu->cpu_base_spl; if (newpri < basepri) newpri = basepri; cpu->cpu_m.mcpu_pri = newpri; (*setspl)(newpri); /* * If we are going to reenable interrupts see if new priority level * allows pending softint delivery. */ if ((flag & PS_IE) && bsrw_insn((uint16_t)cpu->cpu_softinfo.st_pending) > newpri) fakesoftint(); ASSERT(!interrupts_enabled()); intr_restore(flag); return (curpri); } /* * Common spl raise routine, takes new ipl to set * returns the old ipl, will not lower ipl. */ int splr(int newpri) { ulong_t flag; cpu_t *cpu; int curpri, basepri; flag = intr_clear(); cpu = CPU; /* ints are disabled, now safe to cache cpu ptr */ curpri = cpu->cpu_m.mcpu_pri; /* * Only do something if new priority is larger */ if (newpri > curpri) { basepri = cpu->cpu_base_spl; if (newpri < basepri) newpri = basepri; cpu->cpu_m.mcpu_pri = newpri; (*setspl)(newpri); /* * See if new priority level allows pending softint delivery */ if ((flag & PS_IE) && bsrw_insn((uint16_t)cpu->cpu_softinfo.st_pending) > newpri) fakesoftint(); } intr_restore(flag); return (curpri); } int getpil(void) { return (CPU->cpu_m.mcpu_pri); } int interrupts_enabled(void) { ulong_t flag; flag = getflags(); return ((flag & PS_IE) == PS_IE); } #ifdef DEBUG void assert_ints_enabled(void) { ASSERT(!interrupts_unleashed || interrupts_enabled()); } #endif /* DEBUG */