1 /*- 2 * Copyright (c) 2001 Wind River Systems, Inc. 3 * All rights reserved. 4 * Written by: John Baldwin <jhb@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the author nor the names of any co-contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * This module provides MI support for per-cpu data. 33 * 34 * Each architecture determines the mapping of logical CPU IDs to physical 35 * CPUs. The requirements of this mapping are as follows: 36 * - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1. 37 * - The mapping is not required to be dense. That is, there may be 38 * gaps in the mappings. 39 * - The platform sets the value of MAXCPU in <machine/param.h>. 40 * - It is suggested, but not required, that in the non-SMP case, the 41 * platform define MAXCPU to be 1 and define the logical ID of the 42 * sole CPU as 0. 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include "opt_ddb.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/linker_set.h> 53 #include <sys/lock.h> 54 #include <sys/pcpu.h> 55 #include <sys/proc.h> 56 #include <sys/smp.h> 57 #include <ddb/ddb.h> 58 59 static struct pcpu *cpuid_to_pcpu[MAXCPU]; 60 struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead); 61 62 /* 63 * Initialize the MI portions of a struct pcpu. 64 */ 65 void 66 pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 67 { 68 69 bzero(pcpu, size); 70 KASSERT(cpuid >= 0 && cpuid < MAXCPU, 71 ("pcpu_init: invalid cpuid %d", cpuid)); 72 pcpu->pc_cpuid = cpuid; 73 pcpu->pc_cpumask = 1 << cpuid; 74 cpuid_to_pcpu[cpuid] = pcpu; 75 SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu); 76 cpu_pcpu_init(pcpu, cpuid, size); 77 } 78 79 /* 80 * Destroy a struct pcpu. 81 */ 82 void 83 pcpu_destroy(struct pcpu *pcpu) 84 { 85 86 SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu); 87 cpuid_to_pcpu[pcpu->pc_cpuid] = NULL; 88 } 89 90 /* 91 * Locate a struct pcpu by cpu id. 92 */ 93 struct pcpu * 94 pcpu_find(u_int cpuid) 95 { 96 97 return (cpuid_to_pcpu[cpuid]); 98 } 99 100 #ifdef DDB 101 102 static void 103 show_pcpu(struct pcpu *pc) 104 { 105 struct thread *td; 106 107 db_printf("cpuid = %d\n", pc->pc_cpuid); 108 db_printf("curthread = "); 109 td = pc->pc_curthread; 110 if (td != NULL) 111 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 112 td->td_proc->p_comm); 113 else 114 db_printf("none\n"); 115 db_printf("curpcb = %p\n", pc->pc_curpcb); 116 db_printf("fpcurthread = "); 117 td = pc->pc_fpcurthread; 118 if (td != NULL) 119 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 120 td->td_proc->p_comm); 121 else 122 db_printf("none\n"); 123 db_printf("idlethread = "); 124 td = pc->pc_idlethread; 125 if (td != NULL) 126 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 127 td->td_proc->p_comm); 128 else 129 db_printf("none\n"); 130 db_show_mdpcpu(pc); 131 132 #ifdef WITNESS 133 db_printf("spin locks held:\n"); 134 witness_list_locks(&pc->pc_spinlocks); 135 #endif 136 } 137 138 DB_SHOW_COMMAND(pcpu, db_show_pcpu) 139 { 140 struct pcpu *pc; 141 int id; 142 143 if (have_addr) 144 id = ((addr >> 4) % 16) * 10 + (addr % 16); 145 else 146 id = PCPU_GET(cpuid); 147 pc = pcpu_find(id); 148 if (pc == NULL) { 149 db_printf("CPU %d not found\n", id); 150 return; 151 } 152 show_pcpu(pc); 153 } 154 155 DB_SHOW_COMMAND(allpcpu, db_show_cpu_all) 156 { 157 struct pcpu *pc; 158 int id; 159 160 db_printf("Current CPU: %d\n\n", PCPU_GET(cpuid)); 161 for (id = 0; id <= mp_maxid; id++) { 162 pc = pcpu_find(id); 163 if (pc != NULL) { 164 show_pcpu(pc); 165 db_printf("\n"); 166 } 167 } 168 } 169 #endif 170