FreeBSD/Linux Kernel Cross Reference
sys/sys/smp.h
1 /*-
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 * $FreeBSD: releng/8.1/sys/sys/smp.h 199583 2009-11-20 15:27:52Z jhb $
10 */
11
12 #ifndef _SYS_SMP_H_
13 #define _SYS_SMP_H_
14
15 #ifdef _KERNEL
16
17 #ifndef LOCORE
18
19 #ifdef SMP
20
21 /*
22 * Topology of a NUMA or HTT system.
23 *
24 * The top level topology is an array of pointers to groups. Each group
25 * contains a bitmask of cpus in its group or subgroups. It may also
26 * contain a pointer to an array of child groups.
27 *
28 * The bitmasks at non leaf groups may be used by consumers who support
29 * a smaller depth than the hardware provides.
30 *
31 * The topology may be omitted by systems where all CPUs are equal.
32 */
33
34 struct cpu_group {
35 struct cpu_group *cg_parent; /* Our parent group. */
36 struct cpu_group *cg_child; /* Optional children groups. */
37 cpumask_t cg_mask; /* Mask of cpus in this group. */
38 int8_t cg_count; /* Count of cpus in this group. */
39 int8_t cg_children; /* Number of children groups. */
40 int8_t cg_level; /* Shared cache level. */
41 int8_t cg_flags; /* Traversal modifiers. */
42 };
43
44 /*
45 * Defines common resources for CPUs in the group. The highest level
46 * resource should be used when multiple are shared.
47 */
48 #define CG_SHARE_NONE 0
49 #define CG_SHARE_L1 1
50 #define CG_SHARE_L2 2
51 #define CG_SHARE_L3 3
52
53 /*
54 * Behavior modifiers for load balancing and affinity.
55 */
56 #define CG_FLAG_HTT 0x01 /* Schedule the alternate core last. */
57 #define CG_FLAG_SMT 0x02 /* New age htt, less crippled. */
58 #define CG_FLAG_THREAD (CG_FLAG_HTT | CG_FLAG_SMT) /* Any threading. */
59
60 /*
61 * Convenience routines for building topologies.
62 */
63 struct cpu_group *smp_topo(void);
64 struct cpu_group *smp_topo_none(void);
65 struct cpu_group *smp_topo_1level(int l1share, int l1count, int l1flags);
66 struct cpu_group *smp_topo_2level(int l2share, int l2count, int l1share,
67 int l1count, int l1flags);
68 struct cpu_group *smp_topo_find(struct cpu_group *top, int cpu);
69
70 extern void (*cpustop_restartfunc)(void);
71 extern int smp_active;
72 extern int smp_cpus;
73 extern volatile cpumask_t started_cpus;
74 extern volatile cpumask_t stopped_cpus;
75 extern cpumask_t idle_cpus_mask;
76 extern cpumask_t hlt_cpus_mask;
77 extern cpumask_t logical_cpus_mask;
78 #endif /* SMP */
79
80 extern u_int mp_maxid;
81 extern int mp_maxcpus;
82 extern int mp_ncpus;
83 extern volatile int smp_started;
84
85 extern cpumask_t all_cpus;
86
87 /*
88 * Macro allowing us to determine whether a CPU is absent at any given
89 * time, thus permitting us to configure sparse maps of cpuid-dependent
90 * (per-CPU) structures.
91 */
92 #define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0)
93
94 #ifdef SMP
95 /*
96 * Machine dependent functions used to initialize MP support.
97 *
98 * The cpu_mp_probe() should check to see if MP support is present and return
99 * zero if it is not or non-zero if it is. If MP support is present, then
100 * cpu_mp_start() will be called so that MP can be enabled. This function
101 * should do things such as startup secondary processors. It should also
102 * setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
103 * smp_active and smp_started are initialized at the appropriate time.
104 * Once cpu_mp_start() returns, machine independent MP startup code will be
105 * executed and a simple message will be output to the console. Finally,
106 * cpu_mp_announce() will be called so that machine dependent messages about
107 * the MP support may be output to the console if desired.
108 *
109 * The cpu_setmaxid() function is called very early during the boot process
110 * so that the MD code may set mp_maxid to provide an upper bound on CPU IDs
111 * that other subsystems may use. If a platform is not able to determine
112 * the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1.
113 */
114 struct thread;
115
116 struct cpu_group *cpu_topo(void);
117 void cpu_mp_announce(void);
118 int cpu_mp_probe(void);
119 void cpu_mp_setmaxid(void);
120 void cpu_mp_start(void);
121
122 void forward_signal(struct thread *);
123 int restart_cpus(cpumask_t);
124 int stop_cpus(cpumask_t);
125 int stop_cpus_hard(cpumask_t);
126 #if defined(__amd64__)
127 int suspend_cpus(cpumask_t);
128 #endif
129 void smp_rendezvous_action(void);
130 extern struct mtx smp_ipi_mtx;
131
132 #endif /* SMP */
133 void smp_no_rendevous_barrier(void *);
134 void smp_rendezvous(void (*)(void *),
135 void (*)(void *),
136 void (*)(void *),
137 void *arg);
138 void smp_rendezvous_cpus(cpumask_t,
139 void (*)(void *),
140 void (*)(void *),
141 void (*)(void *),
142 void *arg);
143 #endif /* !LOCORE */
144 #endif /* _KERNEL */
145 #endif /* _SYS_SMP_H_ */
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