The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/smp.h

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    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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