2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2001 Wind River Systems, Inc.
6 * Written by: John Baldwin <jhb@FreeBSD.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
39 #error "no assembler-serviceable parts inside"
42 #include <sys/param.h>
43 #include <sys/_cpuset.h>
44 #include <sys/_lock.h>
45 #include <sys/_mutex.h>
47 #include <sys/queue.h>
48 #include <sys/_rmlock.h>
49 #include <sys/resource.h>
50 #include <machine/pcpu.h>
52 #define DPCPU_SETNAME "set_pcpu"
53 #define DPCPU_SYMPREFIX "pcpu_entry_"
58 * Define a set for pcpu data.
60 extern uintptr_t *__start_set_pcpu;
61 __GLOBL(__start_set_pcpu);
62 extern uintptr_t *__stop_set_pcpu;
63 __GLOBL(__stop_set_pcpu);
66 * Array of dynamic pcpu base offsets. Indexed by id.
68 extern uintptr_t dpcpu_off[];
71 * Convenience defines.
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))
81 * Declaration and definition.
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))
90 * On some architectures the compiler will use PC-relative load to
91 * find the address of DPCPU data with the static keyword. We then
92 * use this to find the offset of the data in a per-CPU region.
93 * This works for in the kernel as we can allocate the space ahead
94 * of time, however modules need to allocate a sepatate space and
95 * then use relocations to fix the address of the data. As
96 * PC-relative data doesn't have a relocation there is nothing for
97 * the kernel module linker to fix so data is accessed from the
100 * This is a workaround until a better solution can be found.
102 * VNET_DEFINE_STATIC also has the same workaround.
104 #define DPCPU_DEFINE_STATIC(t, n) \
105 t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
107 #define DPCPU_DEFINE_STATIC(t, n) \
108 static t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
112 * Accessors with a given base.
114 #define _DPCPU_PTR(b, n) \
115 (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
116 #define _DPCPU_GET(b, n) (*_DPCPU_PTR(b, n))
117 #define _DPCPU_SET(b, n, v) (*_DPCPU_PTR(b, n) = v)
120 * Accessors for the current cpu.
122 #define DPCPU_PTR(n) _DPCPU_PTR(PCPU_GET(dynamic), n)
123 #define DPCPU_GET(n) (*DPCPU_PTR(n))
124 #define DPCPU_SET(n, v) (*DPCPU_PTR(n) = v)
127 * Accessors for remote cpus.
129 #define DPCPU_ID_PTR(i, n) _DPCPU_PTR(dpcpu_off[(i)], n)
130 #define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n))
131 #define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v)
136 #define DPCPU_SUM(n) __extension__ \
139 __typeof(*DPCPU_PTR(n)) sum; \
143 sum += *DPCPU_ID_PTR(_i, n); \
148 #define DPCPU_VARSUM(n, var) __extension__ \
151 __typeof((DPCPU_PTR(n))->var) sum; \
155 sum += (DPCPU_ID_PTR(_i, n))->var; \
160 #define DPCPU_ZERO(n) do { \
164 bzero(DPCPU_ID_PTR(_i, n), sizeof(*DPCPU_PTR(n))); \
171 * This structure maps out the global data that needs to be kept on a
172 * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
173 * macros defined in <machine/pcpu.h>. Machine dependent fields are
174 * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
177 struct thread *pc_curthread; /* Current thread */
178 struct thread *pc_idlethread; /* Idle thread */
179 struct thread *pc_fpcurthread; /* Fp state owner */
180 struct thread *pc_deadthread; /* Zombie thread or NULL */
181 struct pcb *pc_curpcb; /* Current pcb */
182 uint64_t pc_switchtime; /* cpu_ticks() at last csw */
183 int pc_switchticks; /* `ticks' at last csw */
184 u_int pc_cpuid; /* This cpu number */
185 STAILQ_ENTRY(pcpu) pc_allcpu;
186 struct lock_list_entry *pc_spinlocks;
187 long pc_cp_time[CPUSTATES]; /* statclock ticks */
188 struct device *pc_device;
189 void *pc_netisr; /* netisr SWI cookie */
190 int pc_unused1; /* unused field */
191 int pc_domain; /* Memory domain. */
192 struct rm_queue pc_rm_queue; /* rmlock list of trackers */
193 uintptr_t pc_dynamic; /* Dynamic per-cpu data area */
194 uint64_t pc_early_dummy_counter; /* Startup time counter(9) */
197 * Keep MD fields last, so that CPU-specific variations on a
198 * single architecture don't result in offset variations of
199 * the machine-independent fields of the pcpu. Even though
200 * the pcpu structure is private to the kernel, some ports
201 * (e.g., lsof, part of gtop) define _KERNEL and include this
202 * header. While strictly speaking this is wrong, there's no
203 * reason not to keep the offsets of the MI fields constant
204 * if only to make kernel debugging easier.
207 } __aligned(CACHE_LINE_SIZE);
211 STAILQ_HEAD(cpuhead, pcpu);
213 extern struct cpuhead cpuhead;
214 extern struct pcpu *cpuid_to_pcpu[];
216 #define curcpu PCPU_GET(cpuid)
217 #define curproc (curthread->td_proc)
219 #define curthread PCPU_GET(curthread)
221 #define curvidata PCPU_GET(vidata)
223 #define UMA_PCPU_ALLOC_SIZE PAGE_SIZE
226 #if defined(__i386__) || defined(__amd64__)
227 /* Required for counters(9) to work on x86. */
228 CTASSERT(sizeof(struct pcpu) == UMA_PCPU_ALLOC_SIZE);
231 * To minimize memory waste in per-cpu UMA zones, size of struct pcpu
232 * should be denominator of PAGE_SIZE.
234 CTASSERT((PAGE_SIZE / sizeof(struct pcpu)) * sizeof(struct pcpu) == PAGE_SIZE);
235 #endif /* UMA_PCPU_ALLOC_SIZE && x86 */
236 #endif /* CTASSERT */
238 /* Accessor to elements allocated via UMA_ZONE_PCPU zone. */
240 zpcpu_get(void *base)
243 return ((char *)(base) + UMA_PCPU_ALLOC_SIZE * curcpu);
247 zpcpu_get_cpu(void *base, int cpu)
250 return ((char *)(base) + UMA_PCPU_ALLOC_SIZE * cpu);
254 * Machine dependent callouts. cpu_pcpu_init() is responsible for
255 * initializing machine dependent fields of struct pcpu, and
256 * db_show_mdpcpu() is responsible for handling machine dependent
257 * fields for the DDB 'show pcpu' command.
259 void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
260 void db_show_mdpcpu(struct pcpu *pcpu);
262 void *dpcpu_alloc(int size);
263 void dpcpu_copy(void *s, int size);
264 void dpcpu_free(void *s, int size);
265 void dpcpu_init(void *dpcpu, int cpuid);
266 void pcpu_destroy(struct pcpu *pcpu);
267 struct pcpu *pcpu_find(u_int cpuid);
268 void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
272 #endif /* !_SYS_PCPU_H_ */