/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (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 2005 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 static cpuset_t cpu_idle_set; static kmutex_t cpu_idle_lock; typedef const char *fn_t; /* * flags to determine if the PROM routines * should be used to idle/resume/stop cpus */ static int kern_idle[NCPU]; /* kernel's idle loop */ static int cpu_are_paused; extern void debug_flush_windows(); /* * Initialize the idlestop mutex */ void idlestop_init(void) { mutex_init(&cpu_idle_lock, NULL, MUTEX_SPIN, (void *)ipltospl(PIL_15)); } static void cpu_idle_self(void) { uint_t s; label_t save; s = spl8(); debug_flush_windows(); CPU->cpu_m.in_prom = 1; membar_stld(); save = curthread->t_pcb; (void) setjmp(&curthread->t_pcb); kern_idle[CPU->cpu_id] = 1; while (kern_idle[CPU->cpu_id]) /* SPIN */; CPU->cpu_m.in_prom = 0; membar_stld(); curthread->t_pcb = save; splx(s); } void idle_other_cpus(void) { int i, cpuid, ntries; int failed = 0; if (ncpus == 1) return; mutex_enter(&cpu_idle_lock); cpuid = CPU->cpu_id; ASSERT(cpuid < NCPU); cpu_idle_set = cpu_ready_set; CPUSET_DEL(cpu_idle_set, cpuid); if (CPUSET_ISNULL(cpu_idle_set)) return; xt_some(cpu_idle_set, (xcfunc_t *)idle_stop_xcall, (uint64_t)cpu_idle_self, NULL); for (i = 0; i < NCPU; i++) { if (!CPU_IN_SET(cpu_idle_set, i)) continue; ntries = 0x10000; while (!cpu[i]->cpu_m.in_prom && ntries) { DELAY(50); ntries--; } /* * A cpu failing to idle is an error condition, since * we can't be sure anymore of its state. */ if (!cpu[i]->cpu_m.in_prom) { cmn_err(CE_WARN, "cpuid 0x%x failed to idle", i); failed++; } } if (failed) { mutex_exit(&cpu_idle_lock); cmn_err(CE_PANIC, "idle_other_cpus: not all cpus idled"); } } void resume_other_cpus(void) { int i, ntries; int cpuid = CPU->cpu_id; boolean_t failed = B_FALSE; if (ncpus == 1) return; ASSERT(cpuid < NCPU); ASSERT(MUTEX_HELD(&cpu_idle_lock)); for (i = 0; i < NCPU; i++) { if (!CPU_IN_SET(cpu_idle_set, i)) continue; kern_idle[i] = 0; membar_stld(); } for (i = 0; i < NCPU; i++) { if (!CPU_IN_SET(cpu_idle_set, i)) continue; ntries = 0x10000; while (cpu[i]->cpu_m.in_prom && ntries) { DELAY(50); ntries--; } /* * A cpu failing to resume is an error condition, since * intrs may have been directed there. */ if (cpu[i]->cpu_m.in_prom) { cmn_err(CE_WARN, "cpuid 0x%x failed to resume", i); continue; } CPUSET_DEL(cpu_idle_set, i); } failed = !CPUSET_ISNULL(cpu_idle_set); mutex_exit(&cpu_idle_lock); /* * Non-zero if a cpu failed to resume */ if (failed) cmn_err(CE_PANIC, "resume_other_cpus: not all cpus resumed"); } /* * Stop all other cpu's before halting or rebooting. We pause the cpu's * instead of sending a cross call. */ void stop_other_cpus(void) { mutex_enter(&cpu_lock); if (cpu_are_paused) { mutex_exit(&cpu_lock); return; } if (ncpus > 1) intr_redist_all_cpus_shutdown(); pause_cpus(NULL); cpu_are_paused = 1; mutex_exit(&cpu_lock); } int cpu_quiesce_microsecond_sanity_limit = 60 * 1000000; void mp_cpu_quiesce(cpu_t *cp0) { volatile cpu_t *cp = (volatile cpu_t *) cp0; int i, sanity_limit = cpu_quiesce_microsecond_sanity_limit; int cpuid = cp->cpu_id; int found_intr = 1; static fn_t f = "mp_cpu_quiesce"; ASSERT(CPU->cpu_id != cpuid); ASSERT(MUTEX_HELD(&cpu_lock)); ASSERT(cp->cpu_flags & CPU_QUIESCED); /* * Declare CPU as no longer being READY to process interrupts and * wait for them to stop. A CPU that is not READY can no longer * participate in x-calls or x-traps. */ cp->cpu_flags &= ~CPU_READY; CPUSET_DEL(cpu_ready_set, cpuid); membar_sync(); for (i = 0; i < sanity_limit; i++) { if (cp->cpu_intr_actv == 0 && cp->cpu_thread == cp->cpu_idle_thread) { found_intr = 0; break; } DELAY(1); } if (found_intr) { if (cp->cpu_intr_actv) { cmn_err(CE_PANIC, "%s: cpu_intr_actv != 0", f); } else if (cp->cpu_thread != cp->cpu_idle_thread) { cmn_err(CE_PANIC, "%s: cpu_thread != cpu_idle_thread", f); } } } /* * Start CPU on user request. */ /* ARGSUSED */ int mp_cpu_start(struct cpu *cp) { ASSERT(MUTEX_HELD(&cpu_lock)); /* * Platforms that use CPU signatures require the signature * block update to indicate that this CPU is in the OS now. */ CPU_SIGNATURE(OS_SIG, SIGST_RUN, SIGSUBST_NULL, cp->cpu_id); cmp_error_resteer(cp->cpu_id); return (0); /* nothing special to do on this arch */ } /* * Stop CPU on user request. */ /* ARGSUSED */ int mp_cpu_stop(struct cpu *cp) { ASSERT(MUTEX_HELD(&cpu_lock)); cmp_error_resteer(cp->cpu_id); /* * Platforms that use CPU signatures require the signature * block update to indicate that this CPU is offlined now. */ CPU_SIGNATURE(OS_SIG, SIGST_OFFLINE, SIGSUBST_NULL, cp->cpu_id); return (0); /* nothing special to do on this arch */ } /* * Power on CPU. */ int mp_cpu_poweron(struct cpu *cp) { ASSERT(MUTEX_HELD(&cpu_lock)); if (&plat_cpu_poweron) return (plat_cpu_poweron(cp)); /* platform-dependent hook */ return (ENOTSUP); } /* * Power off CPU. */ int mp_cpu_poweroff(struct cpu *cp) { ASSERT(MUTEX_HELD(&cpu_lock)); if (&plat_cpu_poweroff) return (plat_cpu_poweroff(cp)); /* platform-dependent hook */ return (ENOTSUP); } void mp_cpu_faulted_enter(struct cpu *cp) { cpu_faulted_enter(cp); } void mp_cpu_faulted_exit(struct cpu *cp) { cpu_faulted_exit(cp); }