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: head/sys/kern/subr_pcpu.c 191816 2009-05-05 10:56:12Z zec $");
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
59struct pcpu *cpuid_to_pcpu[MAXCPU];
60struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
61
62/*
63 * Initialize the MI portions of a struct pcpu.
64 */
65void
66pcpu_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 pcpu->pc_rm_queue.rmq_next = &pcpu->pc_rm_queue;
78 pcpu->pc_rm_queue.rmq_prev = &pcpu->pc_rm_queue;
79#ifdef KTR
80 snprintf(pcpu->pc_name, sizeof(pcpu->pc_name), "CPU %d", cpuid);
81#endif
82
83}
84
85/*
86 * Destroy a struct pcpu.
87 */
88void
89pcpu_destroy(struct pcpu *pcpu)
90{
91
92 SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu);
93 cpuid_to_pcpu[pcpu->pc_cpuid] = NULL;
94}
95
96/*
97 * Locate a struct pcpu by cpu id.
98 */
99struct pcpu *
100pcpu_find(u_int cpuid)
101{
102
103 return (cpuid_to_pcpu[cpuid]);
104}
105
106#ifdef DDB
107
108static void
109show_pcpu(struct pcpu *pc)
110{
111 struct thread *td;
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_name);
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_name);
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_name);
134 else
135 db_printf("none\n");
136 db_show_mdpcpu(pc);
137
138#ifdef VIMAGE
139 db_printf("curvnet = %p\n", pc->pc_curthread->td_vnet);
140#endif
141
142#ifdef WITNESS
143 db_printf("spin locks held:\n");
144 witness_list_locks(&pc->pc_spinlocks);
145#endif
146}
147
148DB_SHOW_COMMAND(pcpu, db_show_pcpu)
149{
150 struct pcpu *pc;
151 int id;
152
153 if (have_addr)
154 id = ((addr >> 4) % 16) * 10 + (addr % 16);
155 else
156 id = PCPU_GET(cpuid);
157 pc = pcpu_find(id);
158 if (pc == NULL) {
159 db_printf("CPU %d not found\n", id);
160 return;
161 }
162 show_pcpu(pc);
163}
164
165DB_SHOW_ALL_COMMAND(pcpu, db_show_cpu_all)
166{
167 struct pcpu *pc;
168 int id;
169
170 db_printf("Current CPU: %d\n\n", PCPU_GET(cpuid));
171 for (id = 0; id <= mp_maxid; id++) {
172 pc = pcpu_find(id);
173 if (pc != NULL) {
174 show_pcpu(pc);
175 db_printf("\n");
176 }
177 }
178}
179DB_SHOW_ALIAS(allpcpu, db_show_cpu_all);
180#endif