FreeBSD/Linux Kernel Cross Reference
sys/sys/pcpu.h
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: releng/8.2/sys/sys/pcpu.h 214198 2010-10-22 08:42:44Z avg $
31 */
32
33 #ifndef _SYS_PCPU_H_
34 #define _SYS_PCPU_H_
35
36 #ifdef LOCORE
37 #error "no assembler-serviceable parts inside"
38 #endif
39
40 #include <sys/queue.h>
41 #include <sys/vmmeter.h>
42 #include <sys/resource.h>
43 #include <machine/pcpu.h>
44
45 /*
46 * Define a set for pcpu data.
47 */
48 extern uintptr_t *__start_set_pcpu;
49 extern uintptr_t *__stop_set_pcpu;
50
51 /*
52 * Array of dynamic pcpu base offsets. Indexed by id.
53 */
54 extern uintptr_t dpcpu_off[];
55
56 /*
57 * Convenience defines.
58 */
59 #define DPCPU_START ((uintptr_t)&__start_set_pcpu)
60 #define DPCPU_STOP ((uintptr_t)&__stop_set_pcpu)
61 #define DPCPU_BYTES (DPCPU_STOP - DPCPU_START)
62 #define DPCPU_MODMIN 2048
63 #define DPCPU_SIZE roundup2(DPCPU_BYTES, PAGE_SIZE)
64 #define DPCPU_MODSIZE (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN))
65
66 /*
67 * Declaration and definition.
68 */
69 #define DPCPU_NAME(n) pcpu_entry_##n
70 #define DPCPU_DECLARE(t, n) extern t DPCPU_NAME(n)
71 #define DPCPU_DEFINE(t, n) t DPCPU_NAME(n) __section("set_pcpu") __used
72
73 /*
74 * Accessors with a given base.
75 */
76 #define _DPCPU_PTR(b, n) \
77 (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
78 #define _DPCPU_GET(b, n) (*_DPCPU_PTR(b, n))
79 #define _DPCPU_SET(b, n, v) (*_DPCPU_PTR(b, n) = v)
80
81 /*
82 * Accessors for the current cpu.
83 */
84 #define DPCPU_PTR(n) _DPCPU_PTR(PCPU_GET(dynamic), n)
85 #define DPCPU_GET(n) (*DPCPU_PTR(n))
86 #define DPCPU_SET(n, v) (*DPCPU_PTR(n) = v)
87
88 /*
89 * Accessors for remote cpus.
90 */
91 #define DPCPU_ID_PTR(i, n) _DPCPU_PTR(dpcpu_off[(i)], n)
92 #define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n))
93 #define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v)
94
95 /*
96 * Utility macros.
97 */
98 #define DPCPU_SUM(n) __extension__ \
99 ({ \
100 u_int _i; \
101 __typeof(*DPCPU_PTR(n)) sum; \
102 \
103 sum = 0; \
104 CPU_FOREACH(_i) { \
105 sum += *DPCPU_ID_PTR(_i, n); \
106 } \
107 sum; \
108 })
109
110 #define DPCPU_VARSUM(n, var) __extension__ \
111 ({ \
112 u_int _i; \
113 __typeof((DPCPU_PTR(n))->var) sum; \
114 \
115 sum = 0; \
116 CPU_FOREACH(_i) { \
117 sum += (DPCPU_ID_PTR(_i, n))->var; \
118 } \
119 sum; \
120 })
121
122 #define DPCPU_ZERO(n) do { \
123 u_int _i; \
124 \
125 CPU_FOREACH(_i) { \
126 bzero(DPCPU_ID_PTR(_i, n), sizeof(*DPCPU_PTR(n))); \
127 } \
128 } while(0)
129
130 /*
131 * XXXUPS remove as soon as we have per cpu variable
132 * linker sets and can define rm_queue in _rm_lock.h
133 */
134 struct rm_queue {
135 struct rm_queue* volatile rmq_next;
136 struct rm_queue* volatile rmq_prev;
137 };
138
139 #define PCPU_NAME_LEN (sizeof("CPU ") + sizeof(__XSTRING(MAXCPU) + 1))
140
141 /*
142 * This structure maps out the global data that needs to be kept on a
143 * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
144 * macros defined in <machine/pcpu.h>. Machine dependent fields are
145 * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
146 */
147 struct pcpu {
148 struct thread *pc_curthread; /* Current thread */
149 struct thread *pc_idlethread; /* Idle thread */
150 struct thread *pc_fpcurthread; /* Fp state owner */
151 struct thread *pc_deadthread; /* Zombie thread or NULL */
152 struct pcb *pc_curpcb; /* Current pcb */
153 uint64_t pc_switchtime; /* cpu_ticks() at last csw */
154 int pc_switchticks; /* `ticks' at last csw */
155 u_int pc_cpuid; /* This cpu number */
156 cpumask_t pc_cpumask; /* This cpu mask */
157 cpumask_t pc_other_cpus; /* Mask of all other cpus */
158 SLIST_ENTRY(pcpu) pc_allcpu;
159 struct lock_list_entry *pc_spinlocks;
160 #ifdef KTR
161 char pc_name[PCPU_NAME_LEN]; /* String name for KTR */
162 #endif
163 struct vmmeter pc_cnt; /* VM stats counters */
164 long pc_cp_time[CPUSTATES]; /* statclock ticks */
165 struct device *pc_device;
166 void *pc_netisr; /* netisr SWI cookie */
167
168 /*
169 * Stuff for read mostly lock
170 *
171 * XXXUPS remove as soon as we have per cpu variable
172 * linker sets.
173 */
174 struct rm_queue pc_rm_queue;
175
176 uintptr_t pc_dynamic; /* Dynamic per-cpu data area */
177
178 /*
179 * Keep MD fields last, so that CPU-specific variations on a
180 * single architecture don't result in offset variations of
181 * the machine-independent fields of the pcpu. Even though
182 * the pcpu structure is private to the kernel, some ports
183 * (e.g., lsof, part of gtop) define _KERNEL and include this
184 * header. While strictly speaking this is wrong, there's no
185 * reason not to keep the offsets of the MI fields constant
186 * if only to make kernel debugging easier.
187 */
188 PCPU_MD_FIELDS;
189 } __aligned(128);
190
191 #ifdef _KERNEL
192
193 SLIST_HEAD(cpuhead, pcpu);
194
195 extern struct cpuhead cpuhead;
196 extern struct pcpu *cpuid_to_pcpu[MAXCPU];
197
198 #define curcpu PCPU_GET(cpuid)
199 #define curproc (curthread->td_proc)
200 #ifndef curthread
201 #define curthread PCPU_GET(curthread)
202 #endif
203 #define curvidata PCPU_GET(vidata)
204
205 /*
206 * Machine dependent callouts. cpu_pcpu_init() is responsible for
207 * initializing machine dependent fields of struct pcpu, and
208 * db_show_mdpcpu() is responsible for handling machine dependent
209 * fields for the DDB 'show pcpu' command.
210 */
211 void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
212 void db_show_mdpcpu(struct pcpu *pcpu);
213
214 void *dpcpu_alloc(int size);
215 void dpcpu_copy(void *s, int size);
216 void dpcpu_free(void *s, int size);
217 void dpcpu_init(void *dpcpu, int cpuid);
218 void pcpu_destroy(struct pcpu *pcpu);
219 struct pcpu *pcpu_find(u_int cpuid);
220 void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
221
222 #endif /* _KERNEL */
223
224 #endif /* !_SYS_PCPU_H_ */
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