Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/pcpu.h
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001 Wind River Systems, Inc. 5 * All rights reserved. 6 * Written by: John Baldwin <jhb@FreeBSD.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 #ifndef _SYS_PCPU_H_ 36 #define _SYS_PCPU_H_ 37 38 #ifdef LOCORE 39 #error "no assembler-serviceable parts inside" 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/_cpuset.h> 44 #include <sys/_lock.h> 45 #include <sys/_mutex.h> 46 #include <sys/_sx.h> 47 #include <sys/queue.h> 48 #include <sys/_rmlock.h> 49 #include <sys/resource.h> 50 #include <machine/pcpu.h> 51 52 #define DPCPU_SETNAME "set_pcpu" 53 #define DPCPU_SYMPREFIX "pcpu_entry_" 54 55 #ifdef _KERNEL 56 57 /* 58 * Define a set for pcpu data. 59 */ 60 extern uintptr_t *__start_set_pcpu; 61 __GLOBL(__start_set_pcpu); 62 extern uintptr_t *__stop_set_pcpu; 63 __GLOBL(__stop_set_pcpu); 64 65 /* 66 * Array of dynamic pcpu base offsets. Indexed by id. 67 */ 68 extern uintptr_t dpcpu_off[]; 69 70 /* 71 * Convenience defines. 72 */ 73 #define DPCPU_START ((uintptr_t)&__start_set_pcpu) 74 #define DPCPU_STOP ((uintptr_t)&__stop_set_pcpu) 75 #define DPCPU_BYTES (DPCPU_STOP - DPCPU_START) 76 #define DPCPU_MODMIN 2048 77 #define DPCPU_SIZE roundup2(DPCPU_BYTES, PAGE_SIZE) 78 #define DPCPU_MODSIZE (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN)) 79 80 /* 81 * Declaration and definition. 82 */ 83 #define DPCPU_NAME(n) pcpu_entry_##n 84 #define DPCPU_DECLARE(t, n) extern t DPCPU_NAME(n) 85 /* struct _hack is to stop this from being used with the static keyword. */ 86 #define DPCPU_DEFINE(t, n) \ 87 struct _hack; t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used 88 #if defined(KLD_MODULE) && (defined(__aarch64__) || defined(__riscv) \ 89 || defined(__powerpc64__)) 90 /* 91 * On some architectures the compiler will use PC-relative load to 92 * find the address of DPCPU data with the static keyword. We then 93 * use this to find the offset of the data in a per-CPU region. 94 * This works for in the kernel as we can allocate the space ahead 95 * of time, however modules need to allocate a sepatate space and 96 * then use relocations to fix the address of the data. As 97 * PC-relative data doesn't have a relocation there is nothing for 98 * the kernel module linker to fix so data is accessed from the 99 * wrong location. 100 * 101 * This is a workaround until a better solution can be found. 102 * 103 * VNET_DEFINE_STATIC also has the same workaround. 104 */ 105 #define DPCPU_DEFINE_STATIC(t, n) \ 106 t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used 107 #else 108 #define DPCPU_DEFINE_STATIC(t, n) \ 109 static t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used 110 #endif 111 112 /* 113 * Accessors with a given base. 114 */ 115 #define _DPCPU_PTR(b, n) \ 116 (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n)) 117 #define _DPCPU_GET(b, n) (*_DPCPU_PTR(b, n)) 118 #define _DPCPU_SET(b, n, v) (*_DPCPU_PTR(b, n) = v) 119 120 /* 121 * Accessors for the current cpu. 122 */ 123 #define DPCPU_PTR(n) _DPCPU_PTR(PCPU_GET(dynamic), n) 124 #define DPCPU_GET(n) (*DPCPU_PTR(n)) 125 #define DPCPU_SET(n, v) (*DPCPU_PTR(n) = v) 126 127 /* 128 * Accessors for remote cpus. 129 */ 130 #define DPCPU_ID_PTR(i, n) _DPCPU_PTR(dpcpu_off[(i)], n) 131 #define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n)) 132 #define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v) 133 134 /* 135 * Utility macros. 136 */ 137 #define DPCPU_SUM(n) __extension__ \ 138 ({ \ 139 u_int _i; \ 140 __typeof(*DPCPU_PTR(n)) sum; \ 141 \ 142 sum = 0; \ 143 CPU_FOREACH(_i) { \ 144 sum += *DPCPU_ID_PTR(_i, n); \ 145 } \ 146 sum; \ 147 }) 148 149 #define DPCPU_VARSUM(n, var) __extension__ \ 150 ({ \ 151 u_int _i; \ 152 __typeof((DPCPU_PTR(n))->var) sum; \ 153 \ 154 sum = 0; \ 155 CPU_FOREACH(_i) { \ 156 sum += (DPCPU_ID_PTR(_i, n))->var; \ 157 } \ 158 sum; \ 159 }) 160 161 #define DPCPU_ZERO(n) do { \ 162 u_int _i; \ 163 \ 164 CPU_FOREACH(_i) { \ 165 bzero(DPCPU_ID_PTR(_i, n), sizeof(*DPCPU_PTR(n))); \ 166 } \ 167 } while (0) 168 169 #endif /* _KERNEL */ 170 171 /* 172 * This structure maps out the global data that needs to be kept on a 173 * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR 174 * macros defined in <machine/pcpu.h>. Machine dependent fields are 175 * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>. 176 */ 177 struct pcpu { 178 struct thread *pc_curthread; /* Current thread */ 179 struct thread *pc_idlethread; /* Idle thread */ 180 struct thread *pc_fpcurthread; /* Fp state owner */ 181 struct thread *pc_deadthread; /* Zombie thread or NULL */ 182 struct pcb *pc_curpcb; /* Current pcb */ 183 void *pc_sched; /* Scheduler state */ 184 uint64_t pc_switchtime; /* cpu_ticks() at last csw */ 185 int pc_switchticks; /* `ticks' at last csw */ 186 u_int pc_cpuid; /* This cpu number */ 187 STAILQ_ENTRY(pcpu) pc_allcpu; 188 struct lock_list_entry *pc_spinlocks; 189 long pc_cp_time[CPUSTATES]; /* statclock ticks */ 190 struct _device *pc_device; /* CPU device handle */ 191 void *pc_netisr; /* netisr SWI cookie */ 192 int pc_unused1; /* unused field */ 193 int pc_domain; /* Memory domain. */ 194 struct rm_queue pc_rm_queue; /* rmlock list of trackers */ 195 uintptr_t pc_dynamic; /* Dynamic per-cpu data area */ 196 uint64_t pc_early_dummy_counter; /* Startup time counter(9) */ 197 uintptr_t pc_zpcpu_offset; /* Offset into zpcpu allocs */ 198 199 /* 200 * Keep MD fields last, so that CPU-specific variations on a 201 * single architecture don't result in offset variations of 202 * the machine-independent fields of the pcpu. Even though 203 * the pcpu structure is private to the kernel, some ports 204 * (e.g., lsof, part of gtop) define _KERNEL and include this 205 * header. While strictly speaking this is wrong, there's no 206 * reason not to keep the offsets of the MI fields constant 207 * if only to make kernel debugging easier. 208 */ 209 PCPU_MD_FIELDS; 210 } __aligned(CACHE_LINE_SIZE); 211 212 #ifdef _KERNEL 213 214 STAILQ_HEAD(cpuhead, pcpu); 215 216 extern struct cpuhead cpuhead; 217 extern struct pcpu *cpuid_to_pcpu[]; 218 219 #define curcpu PCPU_GET(cpuid) 220 #define curvidata PCPU_GET(vidata) 221 222 #define UMA_PCPU_ALLOC_SIZE PAGE_SIZE 223 224 #include <machine/pcpu_aux.h> 225 226 #ifndef curthread 227 #define curthread PCPU_GET(curthread) 228 #endif 229 #define curproc (curthread->td_proc) 230 231 #ifndef ZPCPU_ASSERT_PROTECTED 232 #define ZPCPU_ASSERT_PROTECTED() MPASS(curthread->td_critnest > 0) 233 #endif 234 235 #ifndef zpcpu_offset_cpu 236 #define zpcpu_offset_cpu(cpu) (UMA_PCPU_ALLOC_SIZE * cpu) 237 #endif 238 #ifndef zpcpu_offset 239 #define zpcpu_offset() (PCPU_GET(zpcpu_offset)) 240 #endif 241 242 #ifndef zpcpu_base_to_offset 243 #define zpcpu_base_to_offset(base) (base) 244 #endif 245 #ifndef zpcpu_offset_to_base 246 #define zpcpu_offset_to_base(base) (base) 247 #endif 248 249 /* Accessor to elements allocated via UMA_ZONE_PCPU zone. */ 250 #define zpcpu_get(base) ({ \ 251 __typeof(base) _ptr = (void *)((char *)(base) + zpcpu_offset()); \ 252 _ptr; \ 253 }) 254 255 #define zpcpu_get_cpu(base, cpu) ({ \ 256 __typeof(base) _ptr = (void *)((char *)(base) + zpcpu_offset_cpu(cpu)); \ 257 _ptr; \ 258 }) 259 260 /* 261 * This operation is NOT atomic and does not post any barriers. 262 * If you use this the assumption is that the target CPU will not 263 * be modifying this variable. 264 * If you need atomicity use xchg. 265 * */ 266 #define zpcpu_replace(base, val) ({ \ 267 __typeof(val) *_ptr = zpcpu_get(base); \ 268 __typeof(val) _old; \ 269 \ 270 _old = *_ptr; \ 271 *_ptr = val; \ 272 _old; \ 273 }) 274 275 #define zpcpu_replace_cpu(base, val, cpu) ({ \ 276 __typeof(val) *_ptr = zpcpu_get_cpu(base, cpu); \ 277 __typeof(val) _old; \ 278 \ 279 _old = *_ptr; \ 280 *_ptr = val; \ 281 _old; \ 282 }) 283 284 #ifndef zpcpu_set_protected 285 #define zpcpu_set_protected(base, val) ({ \ 286 ZPCPU_ASSERT_PROTECTED(); \ 287 __typeof(val) *_ptr = zpcpu_get(base); \ 288 \ 289 *_ptr = (val); \ 290 }) 291 #endif 292 293 #ifndef zpcpu_add_protected 294 #define zpcpu_add_protected(base, val) ({ \ 295 ZPCPU_ASSERT_PROTECTED(); \ 296 __typeof(val) *_ptr = zpcpu_get(base); \ 297 \ 298 *_ptr += (val); \ 299 }) 300 #endif 301 302 #ifndef zpcpu_sub_protected 303 #define zpcpu_sub_protected(base, val) ({ \ 304 ZPCPU_ASSERT_PROTECTED(); \ 305 __typeof(val) *_ptr = zpcpu_get(base); \ 306 \ 307 *_ptr -= (val); \ 308 }) 309 #endif 310 311 /* 312 * Machine dependent callouts. cpu_pcpu_init() is responsible for 313 * initializing machine dependent fields of struct pcpu, and 314 * db_show_mdpcpu() is responsible for handling machine dependent 315 * fields for the DDB 'show pcpu' command. 316 */ 317 void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size); 318 void db_show_mdpcpu(struct pcpu *pcpu); 319 320 void *dpcpu_alloc(int size); 321 void dpcpu_copy(void *s, int size); 322 void dpcpu_free(void *s, int size); 323 void dpcpu_init(void *dpcpu, int cpuid); 324 void pcpu_destroy(struct pcpu *pcpu); 325 struct pcpu *pcpu_find(u_int cpuid); 326 void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size); 327 328 #endif /* _KERNEL */ 329 330 #endif /* !_SYS_PCPU_H_ */
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