smp.h revision 134416
125164Speter/* 225164Speter * ---------------------------------------------------------------------------- 325164Speter * "THE BEER-WARE LICENSE" (Revision 42): 425164Speter * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 525164Speter * can do whatever you want with this stuff. If we meet some day, and you think 625164Speter * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 725164Speter * ---------------------------------------------------------------------------- 825164Speter * 950477Speter * $FreeBSD: head/sys/sys/smp.h 134416 2004-08-28 00:49:55Z obrien $ 1025164Speter */ 1125164Speter 1276078Sjhb#ifndef _SYS_SMP_H_ 1376078Sjhb#define _SYS_SMP_H_ 1425164Speter 1555205Speter#ifdef _KERNEL 1625164Speter 1776078Sjhb#ifndef LOCORE 1825517Sfsmp 1976078Sjhb#ifdef SMP 20117005Sjeff 21117005Sjeff/* 22117005Sjeff * Topology of a NUMA or HTT system. 23117005Sjeff * 24117005Sjeff * The top level topology is an array of pointers to groups. Each group 25117005Sjeff * contains a bitmask of cpus in its group or subgroups. It may also 26117005Sjeff * contain a pointer to an array of child groups. 27117005Sjeff * 28117005Sjeff * The bitmasks at non leaf groups may be used by consumers who support 29117005Sjeff * a smaller depth than the hardware provides. 30117005Sjeff * 31117005Sjeff * The topology may be omitted by systems where all CPUs are equal. 32117005Sjeff */ 33117005Sjeff 34117005Sjeffstruct cpu_group { 35127498Smarcel cpumask_t cg_mask; /* Mask of cpus in this group. */ 36117005Sjeff int cg_count; /* Count of cpus in this group. */ 37117005Sjeff int cg_children; /* Number of children groups. */ 38117005Sjeff struct cpu_group *cg_child; /* Optional child group. */ 39117005Sjeff}; 40117005Sjeff 41117005Sjeffstruct cpu_top { 42117005Sjeff int ct_count; /* Count of groups. */ 43117005Sjeff struct cpu_group *ct_group; /* Array of pointers to cpu groups. */ 44117005Sjeff}; 45117005Sjeff 46117005Sjeffextern struct cpu_top *smp_topology; 4776078Sjhbextern void (*cpustop_restartfunc)(void); 4876078Sjhbextern int smp_active; 4976078Sjhbextern int smp_cpus; 50127498Smarcelextern volatile cpumask_t started_cpus; 51127498Smarcelextern volatile cpumask_t stopped_cpus; 52123125Sjhb#endif /* SMP */ 53123125Sjhb 54127498Smarcelextern cpumask_t all_cpus; 5591673Sjeffextern u_int mp_maxid; 56123125Sjhbextern int mp_ncpus; 57123125Sjhbextern volatile int smp_started; 5827728Sfsmp 5927002Sfsmp/* 6080779Sbmilekic * Macro allowing us to determine whether a CPU is absent at any given 6180779Sbmilekic * time, thus permitting us to configure sparse maps of cpuid-dependent 6280779Sbmilekic * (per-CPU) structures. 6380779Sbmilekic */ 6480779Sbmilekic#define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0) 6580779Sbmilekic 66123125Sjhb#ifdef SMP 6780779Sbmilekic/* 6876078Sjhb * Machine dependent functions used to initialize MP support. 6976078Sjhb * 7076078Sjhb * The cpu_mp_probe() should check to see if MP support is present and return 7176078Sjhb * zero if it is not or non-zero if it is. If MP support is present, then 7276078Sjhb * cpu_mp_start() will be called so that MP can be enabled. This function 7376078Sjhb * should do things such as startup secondary processors. It should also 7476078Sjhb * setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that 7576078Sjhb * smp_active and smp_started are initialized at the appropriate time. 7676078Sjhb * Once cpu_mp_start() returns, machine independent MP startup code will be 7776078Sjhb * executed and a simple message will be output to the console. Finally, 7876078Sjhb * cpu_mp_announce() will be called so that machine dependent messages about 7976078Sjhb * the MP support may be output to the console if desired. 80122947Sjhb * 81122947Sjhb * The cpu_setmaxid() function is called very early during the boot process 82122947Sjhb * so that the MD code may set mp_maxid to provide an upper bound on CPU IDs 83122947Sjhb * that other subsystems may use. If a platform is not able to determine 84123126Sjhb * the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1. 8527002Sfsmp */ 8696999Sjakestruct thread; 8796999Sjake 8876078Sjhbvoid cpu_mp_announce(void); 8976078Sjhbint cpu_mp_probe(void); 90122947Sjhbvoid cpu_mp_setmaxid(void); 9176078Sjhbvoid cpu_mp_start(void); 9227002Sfsmp 9383366Sjulianvoid forward_signal(struct thread *); 9476078Sjhbvoid forward_roundrobin(void); 95127498Smarcelint restart_cpus(cpumask_t); 96127498Smarcelint stop_cpus(cpumask_t); 9776078Sjhbvoid smp_rendezvous_action(void); 98134416Sobrienextern struct mtx smp_ipi_mtx; 99123125Sjhb#endif /* SMP */ 10076078Sjhbvoid smp_rendezvous(void (*)(void *), 10176078Sjhb void (*)(void *), 10276078Sjhb void (*)(void *), 10376078Sjhb void *arg); 10427728Sfsmp#endif /* !LOCORE */ 10555205Speter#endif /* _KERNEL */ 10676078Sjhb#endif /* _SYS_SMP_H_ */ 107