f53d15fe1b
lock optimized for almost exclusive reader access. (see also rmlock.9)
TODO:
Convert to per cpu variables linkerset as soon as it is available.
Optimize UP (single processor) case.
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*-
|
|
* ----------------------------------------------------------------------------
|
|
* "THE BEER-WARE LICENSE" (Revision 42):
|
|
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
|
|
* can do whatever you want with this stuff. If we meet some day, and you think
|
|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
|
|
* ----------------------------------------------------------------------------
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_SMP_H_
|
|
#define _SYS_SMP_H_
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#ifndef LOCORE
|
|
|
|
#ifdef SMP
|
|
|
|
/*
|
|
* Topology of a NUMA or HTT system.
|
|
*
|
|
* The top level topology is an array of pointers to groups. Each group
|
|
* contains a bitmask of cpus in its group or subgroups. It may also
|
|
* contain a pointer to an array of child groups.
|
|
*
|
|
* The bitmasks at non leaf groups may be used by consumers who support
|
|
* a smaller depth than the hardware provides.
|
|
*
|
|
* The topology may be omitted by systems where all CPUs are equal.
|
|
*/
|
|
|
|
struct cpu_group {
|
|
cpumask_t cg_mask; /* Mask of cpus in this group. */
|
|
int cg_count; /* Count of cpus in this group. */
|
|
int cg_children; /* Number of children groups. */
|
|
struct cpu_group *cg_child; /* Optional child group. */
|
|
};
|
|
|
|
struct cpu_top {
|
|
int ct_count; /* Count of groups. */
|
|
struct cpu_group *ct_group; /* Array of pointers to cpu groups. */
|
|
};
|
|
|
|
extern struct cpu_top *smp_topology;
|
|
extern void (*cpustop_restartfunc)(void);
|
|
extern int smp_active;
|
|
extern int smp_cpus;
|
|
extern volatile cpumask_t started_cpus;
|
|
extern volatile cpumask_t stopped_cpus;
|
|
extern cpumask_t idle_cpus_mask;
|
|
extern cpumask_t hlt_cpus_mask;
|
|
extern cpumask_t logical_cpus_mask;
|
|
#endif /* SMP */
|
|
|
|
extern u_int mp_maxid;
|
|
extern int mp_maxcpus;
|
|
extern int mp_ncpus;
|
|
extern volatile int smp_started;
|
|
|
|
extern cpumask_t all_cpus;
|
|
|
|
/*
|
|
* Macro allowing us to determine whether a CPU is absent at any given
|
|
* time, thus permitting us to configure sparse maps of cpuid-dependent
|
|
* (per-CPU) structures.
|
|
*/
|
|
#define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0)
|
|
|
|
#ifdef SMP
|
|
/*
|
|
* Machine dependent functions used to initialize MP support.
|
|
*
|
|
* The cpu_mp_probe() should check to see if MP support is present and return
|
|
* zero if it is not or non-zero if it is. If MP support is present, then
|
|
* cpu_mp_start() will be called so that MP can be enabled. This function
|
|
* should do things such as startup secondary processors. It should also
|
|
* setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
|
|
* smp_active and smp_started are initialized at the appropriate time.
|
|
* Once cpu_mp_start() returns, machine independent MP startup code will be
|
|
* executed and a simple message will be output to the console. Finally,
|
|
* cpu_mp_announce() will be called so that machine dependent messages about
|
|
* the MP support may be output to the console if desired.
|
|
*
|
|
* The cpu_setmaxid() function is called very early during the boot process
|
|
* so that the MD code may set mp_maxid to provide an upper bound on CPU IDs
|
|
* that other subsystems may use. If a platform is not able to determine
|
|
* the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1.
|
|
*/
|
|
struct thread;
|
|
|
|
void cpu_mp_announce(void);
|
|
int cpu_mp_probe(void);
|
|
void cpu_mp_setmaxid(void);
|
|
void cpu_mp_start(void);
|
|
|
|
void forward_signal(struct thread *);
|
|
void forward_roundrobin(void);
|
|
int restart_cpus(cpumask_t);
|
|
int stop_cpus(cpumask_t);
|
|
void smp_rendezvous_action(void);
|
|
void smp_no_rendevous_barrier(void *);
|
|
extern struct mtx smp_ipi_mtx;
|
|
|
|
#endif /* SMP */
|
|
void smp_rendezvous(void (*)(void *),
|
|
void (*)(void *),
|
|
void (*)(void *),
|
|
void *arg);
|
|
#endif /* !LOCORE */
|
|
#endif /* _KERNEL */
|
|
#endif /* _SYS_SMP_H_ */
|