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/8.0/sys/sys/pcpu.h 196119 2009-08-12 10:32:20Z bz $
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 struct pcb;
46 struct thread;
47
48 /*
49 * Define a set for pcpu data.
50 *
51 * We don't use SET_DECLARE because it defines the set as 'a' when we
52 * want 'aw'. GCC considers uninitialized data in a seperate section
53 * writable and there is no generic zero initializer that works for
54 * structs and scalars.
55 */
56 extern uintptr_t *__start_set_pcpu;
57 extern uintptr_t *__stop_set_pcpu;
58
59 __asm__(
60 #if defined(__arm__)
61 ".section set_pcpu, \"aw\", %progbits\n"
62 #else
63 ".section set_pcpu, \"aw\", @progbits\n"
64 #endif
65 "\t.p2align " __XSTRING(CACHE_LINE_SHIFT) "\n"
66 "\t.previous");
67
68 /*
69 * Array of dynamic pcpu base offsets. Indexed by id.
70 */
71 extern uintptr_t dpcpu_off[];
72
73 /*
74 * Convenience defines.
75 */
76 #define DPCPU_START (uintptr_t)&__start_set_pcpu
77 #define DPCPU_STOP (uintptr_t)&__stop_set_pcpu
78 #define DPCPU_BYTES (DPCPU_STOP - DPCPU_START)
79 #define DPCPU_MODMIN 2048
80 #define DPCPU_SIZE roundup2(DPCPU_BYTES, PAGE_SIZE)
81 #define DPCPU_MODSIZE (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN))
82
83 /*
84 * Declaration and definition.
85 */
86 #define DPCPU_NAME(n) pcpu_entry_##n
87 #define DPCPU_DECLARE(t, n) extern t DPCPU_NAME(n)
88 #define DPCPU_DEFINE(t, n) t DPCPU_NAME(n) __section("set_pcpu") __used
89
90 /*
91 * Accessors with a given base.
92 */
93 #define _DPCPU_PTR(b, n) \
94 (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
95 #define _DPCPU_GET(b, n) (*_DPCPU_PTR(b, n))
96 #define _DPCPU_SET(b, n, v) (*_DPCPU_PTR(b, n) = v)
97
98 /*
99 * Accessors for the current cpu.
100 */
101 #define DPCPU_PTR(n) _DPCPU_PTR(PCPU_GET(dynamic), n)
102 #define DPCPU_GET(n) (*DPCPU_PTR(n))
103 #define DPCPU_SET(n, v) (*DPCPU_PTR(n) = v)
104
105 /*
106 * Accessors for remote cpus.
107 */
108 #define DPCPU_ID_PTR(i, n) _DPCPU_PTR(dpcpu_off[(i)], n)
109 #define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n))
110 #define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v)
111
112 /*
113 * XXXUPS remove as soon as we have per cpu variable
114 * linker sets and can define rm_queue in _rm_lock.h
115 */
116 struct rm_queue {
117 struct rm_queue* volatile rmq_next;
118 struct rm_queue* volatile rmq_prev;
119 };
120
121 #define PCPU_NAME_LEN (sizeof("CPU ") + sizeof(__XSTRING(MAXCPU) + 1))
122
123
124 /*
125 * This structure maps out the global data that needs to be kept on a
126 * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
127 * macros defined in <machine/pcpu.h>. Machine dependent fields are
128 * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
129 */
130 struct pcpu {
131 struct thread *pc_curthread; /* Current thread */
132 struct thread *pc_idlethread; /* Idle thread */
133 struct thread *pc_fpcurthread; /* Fp state owner */
134 struct thread *pc_deadthread; /* Zombie thread or NULL */
135 struct pcb *pc_curpcb; /* Current pcb */
136 uint64_t pc_switchtime;
137 int pc_switchticks;
138 u_int pc_cpuid; /* This cpu number */
139 cpumask_t pc_cpumask; /* This cpu mask */
140 cpumask_t pc_other_cpus; /* Mask of all other cpus */
141 SLIST_ENTRY(pcpu) pc_allcpu;
142 struct lock_list_entry *pc_spinlocks;
143 #ifdef KTR
144 char pc_name[PCPU_NAME_LEN]; /* String name for KTR. */
145 #endif
146 struct vmmeter pc_cnt; /* VM stats counters */
147 long pc_cp_time[CPUSTATES]; /* statclock ticks */
148 struct device *pc_device;
149 void *pc_netisr; /* netisr SWI cookie. */
150
151 /*
152 * Stuff for read mostly lock
153 *
154 * XXXUPS remove as soon as we have per cpu variable
155 * linker sets.
156 */
157 struct rm_queue pc_rm_queue;
158
159 /*
160 * Dynamic per-cpu data area.
161 */
162 uintptr_t pc_dynamic;
163
164 /*
165 * Keep MD fields last, so that CPU-specific variations on a
166 * single architecture don't result in offset variations of
167 * the machine-independent fields of the pcpu. Even though
168 * the pcpu structure is private to the kernel, some ports
169 * (e.g. lsof, part of gtop) define _KERNEL and include this
170 * header. While strictly speaking this is wrong, there's no
171 * reason not to keep the offsets of the MI fields contants.
172 * If only to make kernel debugging easier...
173 */
174 PCPU_MD_FIELDS;
175 } __aligned(128);
176
177 #ifdef _KERNEL
178
179 SLIST_HEAD(cpuhead, pcpu);
180
181 extern struct cpuhead cpuhead;
182
183 #define curcpu PCPU_GET(cpuid)
184 #define curproc (curthread->td_proc)
185 #ifndef curthread
186 #define curthread PCPU_GET(curthread)
187 #endif
188 #define curvidata PCPU_GET(vidata)
189
190 /*
191 * Machine dependent callouts. cpu_pcpu_init() is responsible for
192 * initializing machine dependent fields of struct pcpu, and
193 * db_show_mdpcpu() is responsible for handling machine dependent
194 * fields for the DDB 'show pcpu' command.
195 */
196
197 extern struct pcpu *cpuid_to_pcpu[MAXCPU];
198
199
200 void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
201 void db_show_mdpcpu(struct pcpu *pcpu);
202
203 void pcpu_destroy(struct pcpu *pcpu);
204 struct pcpu *pcpu_find(u_int cpuid);
205 void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
206 void *dpcpu_alloc(int size);
207 void dpcpu_copy(void *s, int size);
208 void dpcpu_free(void *s, int size);
209 void dpcpu_init(void *dpcpu, int cpuid);
210
211 #endif /* _KERNEL */
212
213 #endif /* !_SYS_PCPU_H_ */
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