1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 /* 27 * Copyright 2015, Joyent, Inc. 28 */ 29 30 #include <sys/cpuvar.h> 31 #include <sys/stack.h> 32 #include <vm/seg_kp.h> 33 #include <sys/machparam.h> 34 #include <sys/proc.h> 35 #include <sys/pset.h> 36 #include <sys/sysmacros.h> 37 38 /* 39 * Create and initialize an interrupt thread. 40 */ 41 static void 42 thread_create_intr(cpu_t *cp) 43 { 44 kthread_t *tp; 45 46 tp = thread_create(NULL, LL_INTR_STKSZ, 47 (void (*)())thread_create_intr, NULL, 0, &p0, TS_ONPROC, 0); 48 49 /* 50 * Set the thread in the TS_FREE state. The state will change 51 * to TS_ONPROC only while the interrupt is active. Think of these 52 * as being on a private free list for the CPU. Being TS_FREE keeps 53 * inactive interrupt threads out of debugger thread lists. 54 * 55 * We cannot call thread_create with TS_FREE because of the current 56 * checks there for ONPROC. Fix this when thread_create takes flags. 57 */ 58 THREAD_FREEINTR(tp, cp); 59 60 /* 61 * Nobody should ever reference the credentials of an interrupt 62 * thread so make it NULL to catch any such references. 63 */ 64 tp->t_cred = NULL; 65 tp->t_flag |= T_INTR_THREAD; 66 tp->t_cpu = cp; 67 tp->t_bound_cpu = cp; 68 tp->t_disp_queue = cp->cpu_disp; 69 tp->t_affinitycnt = 1; 70 tp->t_preempt = 1; 71 72 /* 73 * Don't make a user-requested binding on this thread so that 74 * the processor can be offlined. 75 */ 76 tp->t_bind_cpu = PBIND_NONE; /* no USER-requested binding */ 77 tp->t_bind_pset = PS_NONE; 78 79 #if defined(__x86) 80 tp->t_stk -= STACK_ALIGN; 81 *(tp->t_stk) = 0; /* terminate intr thread stack */ 82 #endif 83 84 /* 85 * Link onto CPU's interrupt pool. 86 */ 87 tp->t_link = cp->cpu_intr_thread; 88 cp->cpu_intr_thread = tp; 89 } 90 91 /* 92 * Allocate a given number of interrupt threads for a given CPU. These threads 93 * will get freed by cpu_destroy_bound_threads() when the CPU gets unconfigured. 94 * 95 * Note, high level interrupts are always serviced using cpu_intr_stack and are 96 * not allowed to block. Low level interrupts or soft-interrupts use the 97 * kthread_t's that we create through the calls to thread_create_intr(). 98 */ 99 void 100 cpu_intr_alloc(cpu_t *cp, int n) 101 { 102 int i; 103 104 for (i = 0; i < n; i++) 105 thread_create_intr(cp); 106 107 cp->cpu_intr_stack = (caddr_t)segkp_get(segkp, INTR_STACK_SIZE, 108 KPD_HASREDZONE | KPD_NO_ANON | KPD_LOCKED) + 109 INTR_STACK_SIZE - SA(MINFRAME); 110 } 111