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 * $FreeBSD$ 31 */ 32 33 /* 34 * This module provides MI support for per-cpu data. 35 * 36 * Each architecture determines the mapping of logical CPU IDs to physical 37 * CPUs. The requirements of this mapping are as follows: 38 * - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1. 39 * - The mapping is not required to be dense. That is, there may be 40 * gaps in the mappings. 41 * - The platform sets the value of MAXCPU in <machine/param.h>. 42 * - It is suggested, but not required, that in the non-SMP case, the 43 * platform define MAXCPU to be 1 and define the logical ID of the 44 * sole CPU as 0. 45 */ 46 47 #include "opt_ddb.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/linker_set.h> 52 #include <sys/lock.h> 53 #include <sys/pcpu.h> 54 #include <sys/proc.h> 55 #include <ddb/ddb.h> 56 57 static struct pcpu *cpuid_to_pcpu[MAXCPU]; 58 struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead); 59 60 /* 61 * Initialize the MI portions of a struct pcpu. 62 */ 63 void 64 pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 65 { 66 67 bzero(pcpu, size); 68 KASSERT(cpuid >= 0 && cpuid < MAXCPU, 69 ("pcpu_init: invalid cpuid %d", cpuid)); 70 pcpu->pc_cpuid = cpuid; 71 cpuid_to_pcpu[cpuid] = pcpu; 72 SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu); 73 cpu_pcpu_init(pcpu, cpuid, size); 74 } 75 76 /* 77 * Destroy a struct pcpu. 78 */ 79 void 80 pcpu_destroy(struct pcpu *pcpu) 81 { 82 83 SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu); 84 cpuid_to_pcpu[pcpu->pc_cpuid] = NULL; 85 } 86 87 /* 88 * Locate a struct pcpu by cpu id. 89 */ 90 struct pcpu * 91 pcpu_find(u_int cpuid) 92 { 93 94 return (cpuid_to_pcpu[cpuid]); 95 } 96 97 #ifdef DDB 98 DB_SHOW_COMMAND(pcpu, db_show_pcpu) 99 { 100 struct pcpu *pc; 101 struct thread *td; 102 int id; 103 104 if (have_addr) 105 id = ((addr >> 4) % 16) * 10 + (addr % 16); 106 else 107 id = PCPU_GET(cpuid); 108 pc = pcpu_find(id); 109 if (pc == NULL) { 110 db_printf("CPU %d not found\n", id); 111 return; 112 } 113 db_printf("cpuid = %d\n", pc->pc_cpuid); 114 db_printf("curthread = "); 115 td = pc->pc_curthread; 116 if (td != NULL) 117 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 118 td->td_proc->p_comm); 119 else 120 db_printf("none\n"); 121 db_printf("curpcb = %p\n", pc->pc_curpcb); 122 db_printf("fpcurthread = "); 123 td = pc->pc_fpcurthread; 124 if (td != NULL) 125 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 126 td->td_proc->p_comm); 127 else 128 db_printf("none\n"); 129 db_printf("idlethread = "); 130 td = pc->pc_idlethread; 131 if (td != NULL) 132 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, 133 td->td_proc->p_comm); 134 else 135 db_printf("none\n"); 136 db_show_mdpcpu(pc); 137 138 #ifdef WITNESS 139 db_printf("spin locks held:\n"); 140 witness_list_locks(&pc->pc_spinlocks); 141 #endif 142 } 143 #endif 144